JP4742321B2 - Air conditioner - Google Patents

Description

  The present invention relates to an air conditioner capable of cooling at least indoor air, and more particularly, to an air conditioner provided with at least one of upper and lower and right and left wind direction plates provided at an outlet.

  Conventionally, the control method of the wind direction board comprised in the indoor blower outlet of the air conditioner is disclosed (for example, refer patent document 1). In this prior art, a timer for measuring the elapsed time after setting the angle of the wind direction plate is provided, and when the angle of the wind direction plate of the wind direction adjusting device is set to a lower blowing angle other than the horizontal region of the cooling range during cooling operation, Depending on the position of the lower blowing angle, the predetermined temperature of the indoor heat exchanger detected by the temperature sensor, and the predetermined indoor humidity detected by the humidity sensor, the lower blowing angle of the wind direction plate is set to the predetermined horizontal in the cooling range after a predetermined time has elapsed. It controls to return to the angle. This prevents the wind direction plate from condensing when the wind direction plate continues at the lower blowing angle for a long time, and the direction of the wind direction plate is controlled to keep the lower blowing angle as long as possible within the range where condensation does not occur. It was something to do.

JP 2003-185225 A (pages 3 to 4, FIG. 4)

  In the conventional air conditioner disclosed in Patent Document 1, humidity and the piping temperature of the heat exchanger are used to determine condensation. Furthermore, the control method of the conventional air conditioner is for the user who wants to hit the wind of the air conditioner, and no control is made for the user who does not want to feel the airflow. For users who do not want to hit the wind, even if it is returned to the predetermined horizontal position, depending on the shape of the wind direction plate, the cold air blown out from the air conditioner is blown downward, and for users who do not want to feel the airflow during cooling There was a problem of being uncomfortable.

The present invention has been made to solve the above-described problems, and it is relatively easy to determine the dew condensation and prevent the dew condensation, while satisfying the direction of the air flow required by the user as much as possible. The purpose is to obtain an air conditioner that can realize a comfortable space.
It is another object of the present invention to provide an air conditioner that can provide a comfortable living space without feeling as much as possible the air flow blown out of the air conditioner for users who do not want to feel the air flow.

Air conditioner according to the present invention, a condenser, an evaporator, a refrigerating cycle having a compressor for compressing refrigerant flowing through the Chijimiki及beauty evaporator in coagulation as well, is possible to change the rotational speed in a plurality of steps can, the indoor air sucked from the suction port during the cooling operation and the air blower for blowing to blow into the room from the air outlet in after heat exchange evaporator, disposed rotatably blow outlet, the rotation angle a wind direction plate that allows blow in different directions with respect to the blowout direction of the air blown out from the air outlet by the response to the blower, a compressor rotational speed controller for controlling the rotational speed of the compressor, the rotational angle of the wind direction plate A wind direction plate control device for controlling the air flow and a timer, and at the start of cooling operation, the wind direction plate control device forms a safety angle with a dew that is an angle within a predetermined range with respect to the blowing direction. Set the rotation angle and during cooling operation, Enter the number of revolutions of the compressor from the compressor rotational speed controller, entered the compressor speed, compressor, which is the rotation speed of the upper limit of the compressor when no condensation on preset louvers When the timer is canceled, if the compressor rotation speed is equal to or less than the compressor rotation speed threshold, a timer is set, and the timer is used to set the compressor rotation speed to the compressor rotation speed. when it is determined that the elapsed predetermined time in the state of the threshold, with is rotated to a position which forms a not large turning angle than safety angled front Symbol dew wind direction plate to release the timer, timer If the compressor rotation speed is greater than the compressor rotation speed threshold in the set state, the timer is canceled and the rotation angle of the wind direction plate is maintained at the dew safety angle or the dew safety It is to return to the angle, and the compressor Rolling speed threshold is Ru der those plurality set according to the rotation speed of the blower.

By the present invention lever, it is possible to prevent dew condensation of securely louver, have never can be a rotation control of a stable wind direction plate louvers will change the rotation angle in a short period of time, further can only be the direction of the airflow requirements of the user is satisfied, to obtain an air conditioner which can realize a comfortable space.

Embodiment 1 FIG.
FIG. 1 is a refrigerant circuit diagram schematically showing a configuration of an air conditioner according to Embodiment 1 of the present invention. In FIG. 1, two heat exchangers 30a and 30b, a compressor 50 that compresses refrigerant flowing in the heat exchangers 30a and 30b, a four-way valve 51 that switches between a refrigerant circuit for cooling and heating air, and electronic expansion A refrigeration cycle is configured by having a valve (hereinafter referred to as LEV) 52 and connecting each with a refrigerant pipe as shown in the figure to circulate the refrigerant. The entire refrigerant circuit is stored separately in the indoor unit 100a and the outdoor unit 100b.

  In the cooling operation, a refrigerant pipe is connected in the four-way valve 51 as shown by a solid line, and the heat exchanger 30a is operated as an evaporator and the heat exchanger 30b is operated as a condenser. At this time, the low-temperature and low-pressure gas refrigerant flowing inside the refrigerant circuit is compressed by the compressor 50 to become a high-temperature and high-pressure gas refrigerant. The high-temperature and high-pressure gas refrigerant exchanges heat with outdoor air in the heat exchanger 30b, and the refrigerant itself condenses into a high-pressure and low-temperature liquid refrigerant, and adiabatic expansion in the LEV 52 becomes a low-pressure and low-temperature two-phase refrigerant. The heat exchanger 30 a exchanges heat with room air to evaporate and returns to the compressor 50. The heat exchanger 30a functions as an evaporator to evaporate the refrigerant, so that the indoor air is cooled and the room is cooled. In addition, refrigerant piping is connected within the four-way valve 51 as indicated by a dotted line, and the indoor heat exchanger 30a functions as a condenser to condense the refrigerant, thereby heating indoors by giving warm heat to the indoor air. . Although not shown in FIG. 1, the indoor unit 100 a and the outdoor unit 100 b are each provided with one or a common control device, and the number of revolutions of the compressor 50, the connection of the four-way valve 51, and the LEV 52 The opening degree, the number of rotations of the blower arranged in the vicinity of the heat exchangers 30a and 30b, and the like are controlled. Here, the compressor 50 has at least two stages of compressor operating rotational speeds by the control device.

  Although the four-way valve 51 is shown to be capable of switching between cooling operation and heating operation, the present invention is not limited to this, and at least a cooling operation in which cool air having a low temperature with respect to the sucked air is blown into the room or The present invention relates to an air conditioner that performs a dehumidifying operation.

  FIG. 2 is a longitudinal sectional view schematically showing the indoor unit 100a of the air conditioner according to the present embodiment, and shows a view of a cross section in the central portion as viewed from the side. In FIG. 2, the indoor unit 100 a is installed in the housing 10, the blower 20 that blows the indoor air from the suction port 11 and blows out the sucked air from the blowout port 14, and the blower 20. A heat exchanger 30a that harmonizes the sucked air, a filter 40 that traps dust contained in the sucked air, and air that is harmonized by heat exchange in the heat exchanger 30a. It has the blower outlet 14, the up-and-down wind direction board 1 which bends the harmonized air to the up-down direction, and the left-right wind direction board 3 which bends the harmonized air to the left-right direction.

  The casing 10 has a cylindrical shape in which both end surfaces (not shown) are closed, and a part of the top surface (upper side in the figure) is opened, and the opening constitutes a suction port 11 for sucking air. . In addition, a part of the ground (lower side in the figure) is opened to constitute the air outlet 14 that blows out air. And the front surface (left side in the figure) is opened, and a front door 12 for opening and closing the opening is installed. In addition, the rear surface (right side in the drawing) is closed, and a wall attachment portion (not shown) for attaching the housing 10 to a wall or the like is formed. Moreover, although the structure which provided the suction inlet 11 only in the top surface part is shown in the figure, the suction inlet 11 should just be arrange | positioned in the upstream of the heat exchanger 30a in consideration of the flow of air, The suction port 11 may be provided at any position in the vertical and horizontal directions of the housing 10.

  The blower 20 is disposed in a substantially central portion in the longitudinal section of the housing 10 and forms an air path from the suction port 11 to the blower port 14. The blowing side air passage between the blower 20 and the blower outlet 14 is sandwiched between the nozzle 13 and the rear guide plate 15. As a blown air temperature detecting means for detecting the temperature of the air passing through the blower outlet 14, for example, a blown air temperature sensor 17 is provided in the vicinity of the blower outlet 14. Here, for example, the rear guide plate 15 is fixed by screwing or the like. Has been.

  The heat exchanger 30a is arranged between the suction port 11 and the blower 20, and harmonizes the sucked air (cooling, heating, humidification, dehumidification, etc.). The heat exchanger 30 a includes a heat transfer tube 31 and radiating fins 32 installed on the heat transfer tube 31, and is arranged so as to surround the top surface side and the front surface side of the blower 20. The filter 40 is provided upstream of the heat exchanger 30a, and is formed of, for example, a mesh-like filter vent and a filter frame to which the filter vent is fixed. The configuration and arrangement of the heat exchanger 30a and the filter 40 are not limited to those shown in FIG.

  In the drawing, the blowing direction of the air blown out through the air passage formed by the nozzle 13 and the rear guide plate 15 by the blower 20 is indicated by a white arrow Fout. This blowing direction Fout is a direction in which air is blown through an air passage in a configuration in which the wind direction plates 1 and 3 are not provided. Further, the vertical component of the blowing direction Fout is Fout (v), and the horizontal component is Fout (h). In FIG. 2, the vertical component Fout (v) is shown.

The air harmonized by heat exchange in the heat exchanger 30a is about to be blown out from the blowout port 14 in the blowout direction Fout, but the vertical airflow direction plate 1 that is rotatable in the vertical direction is provided at the blowout port 14. . For this reason, according to the rotation angle of the up-and-down air direction board 1, it is bent up and down with respect to the housing | casing 10, and it blows in the direction different from the blowing direction Fout (v), and blows off widely indoors. Here, for example, two up and down wind direction plates 1a and 1b are provided, and one wind direction plate 1 is formed of the same material as that of the housing 10, and FIG. 2 shows a cross section of the wind direction plates 1a and 1b. The casing 10 is elongated in the width direction, that is, the longitudinal direction. The up-and-down air direction plates 1a and 1b are configured to be rotatable around shafts 2a and 2b, for example, by a stepping motor (not shown) or the like and fixed at a plurality of rotation angles. Stepping motors may be provided on the upper and lower wind direction plates 1a and 1b, respectively, or both the upper and lower wind direction plates 1a and 1b may be rotated by one stepping motor.

  Furthermore, it has left and right wind direction plates 3a and 3b on the blower 20 side of the blower outlet 14 from the up and down wind direction plate 1. The left and right wind direction plates 3a and 3b are configured to be rotatable in the horizontal direction, and the air harmonized by heat exchange in the heat exchanger 30a is bent in the left and right direction with respect to the housing 10 and is blown out in the blowing direction Fout (h ) Is blown in a different direction and is widely blown into the room.

The side surfaces of the left and right wind direction plates 3a and 3b shown in FIG. 2 are shown. Actually, two or more sheets are arranged in the width direction of the housing 10 with respect to the left and right wind direction plates 3a and 3b. It is provided in two rows. The left and right wind direction plates 3a and 3b are also configured to be able to rotate horizontally around the shafts 4a and 4b by a stepping motor (not shown), for example, and to be fixed at a plurality of rotation angles. Here, a configuration having two vertical wind direction plates 1 and two rows of left and right wind direction plates 3 is shown, but the configuration is not limited to the number and the number of columns, and any configuration may be used.
Moreover, since the up-and-down wind direction board 1 is closed and becomes an exterior surface at the time of a stop of operation, it has a curved shape substantially along the line connecting the lower end A of the front door 12 and the lower end B of the outlet 14.

  FIG. 3 is a block diagram schematically showing a control device for an air conditioner according to the present embodiment. Here, the indoor unit control device 61 is provided in the indoor unit 100a, and the outdoor unit control device 62 is provided in the outdoor unit 100b. The control devices 61 and 62 are constituted by a microcomputer, for example, and incorporate a storage unit, a control unit, a timer 66, and the like. The indoor unit control device 61 inputs, for example, a user operation content such as on / off, cooling or heating operation mode commands from the remote control switch 63, or the blown air temperature detected by the blown air temperature sensor 17. To do. Furthermore, it has a plurality of control functions and drives the motor of the blower 20 such as a brushless motor to control the rotational speed, and the rotational angle of the blower rotational speed control device 65 and the wind direction plates 1 and 3 by driving the motor. It functions also as the wind direction board control apparatus 64 which controls. The outdoor unit control device 62 includes a compressor rotation number control device 67 that controls the rotation number of the compressor 50, a four-way valve control device 68 that switches connection of the four-way valve 51, and an LEV control that controls the opening degree of the LEV 52. It functions as the device 69. Information is exchanged between the indoor unit controller 61 and the outdoor unit controller 62.

Hereinafter, the shape and rotation position of the vertical wind direction plate 1 according to the first embodiment will be described in detail with reference to FIG.
As shown in FIG. 4A, the rotation angle of the vertical wind direction plate 1 is defined. The vertical wind direction plate 1 has a curved cross section and is curved from the upstream side 1 m to the downstream side 1 n of the blown air. Therefore, both ends 1m and 1n are connected by a straight line, the blowing direction Fout (v) is a reference line La, and the angle θ between the reference line La and the straight line connecting both ends 1m and 1n is the rotation angle of the vertical wind direction plate 1. And In the figure, the horizontal direction is indicated by L0. The motor of the vertical wind direction plate 1 is driven by the wind direction plate control device 64 shown in FIG. 3, and fixed to a plurality of positions (A to F), for example, as shown in FIG. It is possible to rotate continuously in the range. If the blowing direction Fout (v) of the air passing through the air passage from the blower 20 substantially coincides with the direction of the position C as shown in FIG. 4B, for example, the position i is about θ b = 15 degrees. , Position b is about θ b = 10 degrees, position c is about θ h = 0 degrees, position d is about θ d = about 10 degrees, position ho is about θ e = 20 degrees, position f is about θ f = about 30 degrees. It is. The positions A and B are rotated upward from the reference line La, and the positions D, E and F are rotated downward from the reference line La. Since the up-and-down wind direction plate 1 has a shape as shown in FIG. 4A, the air in the air blowing direction Fout (v) is bent by the up-and-down wind direction plate 1 and is It flows upward in the direction L0. Moreover, when it fixes at position b, it flows in the horizontal direction L0 from the blower outlet 14. FIG. Furthermore, when it fixes to each position C, D, E, it blows in the angle according to each downward from the blower outlet 14 according to the rotation angle.

Next, the situation where dew condensation occurs on the vertical wind direction plate 1 will be described with reference to FIG.
When the rotation angle of the vertical wind direction plate 1 and the air blowing direction Fout (v) greatly intersect as shown in FIGS. 5A and 5B, that is, when the rotation angle is large, a peeling phenomenon occurs in the vertical wind direction plate 1. Will occur. For example, as shown in FIG. 5A, when the vertical wind direction plate 1 is at a position that makes a large angle θb upward with respect to the reference line La, air separation occurs on the lower surface of the vertical wind direction plate 1. Cold air conditioned by the evaporator 30a flows on the upper surface of the vertical wind direction plate 1, and the lower surface of the vertical wind direction plate 1 generates a vortex 5 due to a peeling phenomenon, and the surrounding warm air is caught in the vortex 5 and comes into contact therewith. In this case, the vertical wind direction plate 1 is cooled by the cold air flowing on the upper surface, and when ambient air contacts the lower surface of the vertical wind direction plate 1 and reaches the dew point, condensation occurs on the lower surface of the vertical wind direction plate 1. When this lasts for a long time, there is a problem that the condensed water becomes water droplets and falls below the housing 10. Further, as shown in FIG. 5B, when the vertical wind direction plate 1 is at a position that makes a large angle θ ho and θ downward with respect to the reference line La, Air separation occurs. The phenomenon in which condensation occurs due to the separation of air is the same as in the case of FIG.

  That is, (1) the blown air temperature is low and the up-and-down wind direction plate 1 is cooled to a temperature equal to or lower than the dew point temperature of the surrounding air. (2) The exfoliation phenomenon occurs without the blown cold air flowing so as to wrap around the up-and-down wind direction plate 1, and the surrounding air comes into contact with the up-and-down wind direction plate 1 due to the vortex caused by the separation. When these two phenomena occur at the same time, condensation occurs on the vertical wind direction plate 1. It goes without saying that the occurrence of condensation differs depending on the environmental conditions such as the room temperature and humidity, and that condensation tends to occur when the difference between the room temperature and the blown air temperature is large and when the humidity is high. Here, assuming that the up-and-down wind direction plate 1 is a straight line, the air blown from the blower 20 through the air path and blown out in a curved shape is more easily peeled off on the surface of the wind direction plate 1. In this form, the up-and-down wind direction plate 1 has a curved shape, and the air flow sticks to the curved portion to make it difficult to condense. However, the curved shape of the up-and-down wind direction plate 1 is designed to match the appearance line when the operation of the air conditioner is stopped, and it is difficult to eliminate the peeling phenomenon at all angles.

  Further, as shown in FIG. 6, in the case of having a plurality of vertical wind direction plates 1 a and 1 b, especially when the upper vertical wind direction plate 1 a is turned upward, the nozzle 13 An exfoliation phenomenon occurs on the top of the substrate. In this case as well, the surrounding air is attracted by the vortex 6 caused by the separation phenomenon, and dew condensation occurs on the side surface of the air outlet 14. For this reason, it is desirable to set an upper limit angle with respect to the up-and-down wind direction plate 1, particularly the upper up-and-down wind direction plate 1 a so as not to condense on the side surface of the outlet 14 in an environment where condensation is likely to occur. Here, θ b = about 15 degrees is set as the upper limit angle on the upper side, and θ f = about 30 degrees is set as the upper limit angle on the lower side. However, the angle is not limited to this.

  From the above, in the rotation angle of the vertical wind direction plate 1, the vicinity of the blowing direction Fout (v) shown in FIG. The angle is θs. On the other hand, the positions a, e, and f make a large angle with respect to the blowing direction Fout (v), and are angles at which dew condensation may occur on the vertical wind direction plate 1 depending on environmental conditions. Here, the dew safety angle θs is the maximum angle (position b or position d) where no peeling phenomenon occurs even when the temperature of the blown air at the start of the cooling operation is low, or no condensation occurs even if the peeling phenomenon occurs. For example, it is set by performing a test operation in advance under environmental conditions in which the air conditioner is used.

  Next, the relationship between the environment in which dew condensation occurs on the vertical wind direction plate 1 and the temperature of the blown air will be described. FIG. 7 is a graph showing a change in the blown air temperature from the start of the cooling operation, where the horizontal axis represents time and the vertical axis represents the blown air temperature. This is, for example, a value measured by the blown air temperature sensor 17. The blown air temperature varies depending on the indoor target temperature and environmental conditions, but gradually increases from T1, for example, about 10 ° C., and increases monotonously unless there is a large load change. On the other hand, the room temperature gradually decreases and approaches the indoor target temperature. In the present embodiment, a test operation is performed in advance under a harsh environment that can be considered in the usage environment, for example, a harsh environmental condition such as a room temperature or a room humidity, and blown air that does not cause condensation on the vertical wind direction plate 1. The lower limit of the temperature is detected and preset as the blown air temperature threshold value. When the temperature of the blown air is higher than the blown air temperature threshold during operation, the upper and lower wind direction plates 1 are on the surface of the vertical wind direction plate 1 regardless of the rotation angle of the vertical wind direction plate 1 from position i to position. , And environmental conditions in which condensation does not occur on the side surface of the air outlet 14. In FIG. 7, the blown air temperature threshold value is represented by Ta, for example, about 15 ° C.

FIG. 8 is a flowchart in the case where the rotation position is controlled so as not to condense on the surface of the vertical wind direction plate 1 in accordance with the blown air temperature. For example, the processing is performed by the wind direction plate control device 64 in the indoor unit control device 61. A process is shown.
When the start of cooling operation is instructed by the remote control switch 63, the rotation speed of the compressor 50 is controlled by the compressor speed control device 67, the opening degree of the LEV 52 by the LEV control device 69, and the four-way valve according to the indoor target temperature. The control device 68 sets the switching of the four-way valve 51. Further, the rotational speed of the blower 20 is set by the blower rotational speed control device 65, and the angle of the vertical wind direction plate 1 is set by the wind direction plate control device 64 (ST1). Then, the cooling operation is started. At this time, if the user desires the direction of the air flow to be larger than the range of the dew safety angle θs by the remote control switch 63, the vertical wind direction plate 1 is set in the direction desired by the user. Set. On the other hand, when the user does not particularly desire the direction of the airflow, the angle of the vertical airflow direction plate 1 is limited so as to be within the range of the dew safety angle θs.

  The blown air temperature is detected by the blown air temperature sensor 17 (ST2). Next, the detected blown air temperature is compared with the blown air temperature threshold (Ta) (ST3). In this determination, when the blown air temperature is smaller than the blown air temperature threshold (Ta), the blown air temperature is still low in the graph shown in FIG. 7, and the difference from the indoor target temperature is large. Condition. Therefore, at that time, it is determined whether or not the rotation angle of the up-and-down wind direction plate 1 is within the dew safety angle θs (ST6), and if it is within the dew safety angle θs, the process returns to ST2. If it is determined in ST6 that the rotation angle of the up-and-down wind direction plate 1 is larger than the dew safety angle θs, it is determined whether the duration of the rotation angle is within a predetermined time during which no condensation occurs (ST7). In that case, the process returns to ST2. If it is determined in ST7 that a predetermined time or more has elapsed since the angle of the vertical wind direction plate 1 is set to be larger than the dew safety angle θs, the angle of the vertical wind direction plate 1 is determined to be the dew safety angle θs in ST8. To return to ST2. When the user desires the airflow direction to be an angle larger than the dew safety angle θs by the control of ST6 to ST8, for a predetermined time during which no condensation occurs, for example, about 30 to 60 minutes The wind direction plate 1 is set in a desired direction, and control is performed so that the dew-safety angle θs is within a range after a predetermined time has elapsed. The predetermined duration may be set in advance to a duration that is confirmed to be non-condensing even if the up-and-down wind direction plate 1 has an angle larger than the dew safety angle θs. The predetermined duration may be set to a different time depending on the angle of the up / down wind direction plate 1.

  In the comparison of ST3, when the blown air temperature ≧ the threshold value (Ta) of the blown air temperature, the blown air temperature rises, and the difference from the indoor target temperature becomes small, and even if the humidity is high, there is no condensation on the vertical wind direction plate 1 Under environmental conditions. For this reason, in ST4, the angle of the up-and-down wind direction plate 1 can be rotated to an angle larger than the dew safety angle θs. If the user has set the wind direction so that the remote control switch 63 is positioned at position a, position e, and position, the vertical wind direction plate 1 is rotated in the desired direction in this state. For example, when a swing mode that sequentially changes the wind direction is set, the up-and-down wind direction plate 1 that has been moved from position b to position d until now is moved from position i to position d. Is possible. The subsequent processing further returns to the detection of the blown air temperature (ST2).

By performing such control, the angle of the vertical wind direction plate 1 can be rotated to a large angle with respect to the blowing direction Fout when the environmental condition in which condensation does not occur on the vertical wind direction plate 1 is ensured. Condensation can be prevented and water droplets can be prevented from dripping into the room. In addition, by obtaining a threshold value for the blown air temperature in advance, condensation can be prevented only by determining the blown air temperature, so that the rotation angle of the vertical airflow direction plate 1 can be controlled relatively easily.
Moreover, no matter what the shape of the vertical wind direction plate 1 is, by performing a test operation with the vertical wind direction plate 1 and setting the safe angle of dew and the air temperature threshold, the vertical direction plate 1 can prevent condensation.
Of course, the same applies to the right and left wind direction plates 3, but the details will be described in the second embodiment.

Next, the automatic operation mode of the cooling operation of the air conditioner will be described. The air conditioner according to the present embodiment has a unique automatic operation mode. This automatic operation mode is a normal operation that is set when there is no strong desire of the user in the direction of the normal blown air, etc., and the direction of the blown air is automatically set to realize a comfortable space for the user. Yes. Of course, it is desirable to prevent condensation in this case as well. Here, a comfortable space for the user will be described.
Since the user feels hot at the start of operation, the air blown out at about 10 ° C. is slightly downward, and even if a cold air current is felt, it does not feel so uncomfortable, but rather feels cool and comfortable. On the contrary, when the room approaches the indoor target temperature, the blown air temperature rises, but it is still lower than the ambient temperature, for example, air of about 15 ° C. is blown out. For this reason, when the up-and-down airflow direction plate 1 is directed horizontally or downward, the blown air flows downward and causes the user to feel the airflow. That is, when approaching the indoor target temperature, the user feels cold and uncomfortable when he feels the airflow, contrary to when starting operation. For this reason, when approaching indoor target temperature, it is preferable to turn the up-and-down wind direction plate 1 upward so that the user does not feel the airflow.

  In order to prevent the air cooled by the evaporator 30a from being applied to the user, when the up-and-down air direction plate 1 is blown out in the horizontal direction, for example, at position b in FIG. Therefore, the user flows downward and feels an air current and feels uncomfortable. In order to prevent this, the up-and-down wind direction plate 1 may be rotated so as to be in the position A so as to be directed further upward. However, when the direction blown out through the air path by the blower 20 is the blowing direction Fout, the vertical wind direction plate 1 may be peeled off as shown in FIG. is there. In the automatic operation mode, the surface of the up-and-down wind direction plate 1 is prevented from being separated and dew condensation is performed, and further, the cold air is controlled so as not to be blown as much as possible downward in the direction of the user.

  Control of the rotation angle of the up-and-down air direction plate 1 in the automatic operation mode of cooling will be described based on the flowchart shown in FIG. FIG. 9 is a flowchart in the case of controlling the rotation position so as not to condense on the surface of the upper and lower wind direction plates 1 according to the blown air temperature, and shows, for example, a process performed by the wind direction plate control device 64. Here, the timer 66 is used so that when the blown air temperature fluctuates before and after the blown air temperature threshold Ta, the vertical wind direction plate 1 changes the rotation angle in a short time so as not to become unstable. It also adds control.

  When the start of cooling operation is instructed by the remote control switch 63, the rotation speed of the compressor 50 is controlled by the compressor speed control device 67, the opening degree of the LEV 52 by the LEV control device 69, and the four-way valve according to the indoor target temperature. The control device 68 sets the switching of the four-way valve 51. Further, the rotational speed of the blower 20 is set by the blower rotational speed control device 65, and the angle of the vertical wind direction plate 1 is set by the wind direction plate control device 64 within the range of the dew safety angle θs (ST1). Then, the cooling automatic operation is started.

  In ST2, after the blown air temperature is detected by the blown air temperature sensor 17, the detected blown air temperature is compared with the threshold (Ta) of the blown air temperature (ST3). In this determination, when the blown air temperature <the blown air temperature threshold (Ta), the blown air temperature is still low in the graph shown in FIG. 7, and the difference from the indoor target temperature is large, causing condensation on the vertical wind direction plate 1. It is the environmental condition judged to be. For this reason, if the timer 66 is set, the timer 66 is canceled (ST13) and the process returns to ST1, and the angle of the up-and-down wind direction plate 1 is held at or returned to the safe angle θs of dew.

  If it is determined in ST3 that the blown air temperature ≧ the blown air temperature threshold value (Ta), the blown air temperature rises, and even if the difference from the indoor target temperature is small and the humidity is high, dew condensation occurs on the vertical wind direction plate 1. It is an environmental condition judged not to occur. Therefore, a timer is set when the timer 66 is released in ST11, and it is determined in ST12 whether or not the timer 66 has passed a predetermined time, in this case, 10 minutes or more. If 10 minutes or more have not elapsed, the process returns to ST2 to detect the blown air temperature. When it is determined in ST12 that 10 minutes or more have elapsed since the blown air temperature ≧ the blown air temperature threshold value (Ta), ST5 is executed, the vertical wind direction plate 1 is rotated upward, and the vertical wind direction plate 1 is rotated. Is rotated to an angle larger than the dew safety angle θs. Thereby, the up-and-down wind direction board 1 is fixed to position a, and blowing air flows to the uppermost part. In the subsequent processing, the timer 66 is canceled, and the process returns to the detection of the blown air temperature (ST2).

  In the above-described control, when the environmental condition in which dew condensation does not occur on the up-and-down wind direction plate 1 is surely established, the angle of the up-and-down wind direction plate 1 is rotated to the uppermost position so that air flows in a significantly different direction from the blowing direction Fout Like. For this reason, a comfortable space can be realized without directing cold air to the user, condensation can be reliably prevented, and water droplets can be prevented from dripping into the room. Further, by obtaining a threshold value of the blown air temperature in advance, it is possible to prevent dew condensation only by determining the blown air temperature, and therefore, it is possible to control it relatively easily. Furthermore, the angle of the up-and-down wind direction plate 1 is rotated after a lapse of a predetermined time, in this case, 10 minutes, even after the state where no condensation occurs. In the graph shown in FIG. 7, the angle of the up-and-down wind direction plate 1 is not rotated more than the dew safety angle at the time of M1, but the dew safety angle at the time of M2 after a predetermined time, for example, 10 minutes from M1. It rotates greatly. If the up-and-down wind direction plate 1 is rotated at the time of M1, the up-and-down wind direction plate 1 is frequently moved when the blown air temperature fluctuates up and down near Ta. On the other hand, if it is controlled to rotate at M2 after a predetermined time of about 10 minutes, the upper and lower wind direction plates 1 are rotated after the blown air temperature is stabilized at Ta or higher, so that condensation can be prevented more reliably. At the same time, the vertical wind direction plate 1 can be controlled to rotate stably.

  Further, in ST5 in the automatic operation, when the vertical wind direction plate 1 is rotated to an angle larger than the dew safety angle θs, the vertical wind direction plate 1 is controlled to rotate in a direction where there is no user. For this reason, it is widely used as an air conditioner that provides a comfortable space without giving the user a feeling of airflow of the blown air and without feeling uncomfortable such as feeling cold when the airflow approaches the set temperature. be able to. Further, by rotating the up / down wind direction plate 1 and controlling the left / right wind direction plate 3 in the same manner, it is possible to operate without causing the user to feel the air flow.

  In the present embodiment, as described above, the condenser 30b, the evaporator 30a, the refrigeration cycle having the compressor 50 that compresses the refrigerant flowing in the condenser 30b and the evaporator 30a, and the air sucked from the suction port 11 are used. The air blower 20 that blows air to the air outlet 14 after heat exchange in the evaporator 30a and the air outlet 14 are rotatably provided, and air is blown in a different direction with respect to the air blowing direction Fout blown from the air outlet 14 by the air blower 20. The lower limit of the blown air temperature when no condensation occurs in the wind direction plates 1 and 3, the blown air temperature detection means 17 for detecting the temperature of the air passing through the blowout port 14, and the wind direction plates 1 and 3 is preset as a threshold Ta. When the detected value by the blown air temperature detecting means 17 is compared with the threshold value Ta and it is determined that condensation occurs on the wind direction plates 1 and 3, the wind direction plates 1 and 3 are reduced with respect to the blow direction Fout. When it is determined that no dew condensation occurs on the wind direction plates 1 and 3, the dew safety angle θs with respect to the blowing direction Fout is determined. By providing the wind direction plate control device 64 that can be rotated to a position that makes a larger angle, it is possible to reliably prevent condensation on the wind direction plates 1 and 3 regardless of the shape of the wind direction plates 1 and 3. It is possible to satisfy the wind direction requested by the user as much as possible and to realize a comfortable space. Here, even if it is determined that the dew condensation occurs in the environment where the detection value by the blown air temperature detecting means 17 and the threshold value Ta are compared, the wind direction plates 1 and 3 are blown in the blowing direction Fout during a predetermined duration. May be set at a position that is larger than the dew safety angle θs. That is, it can be determined that condensation does not occur within this predetermined duration.

The wind direction plate is a vertical wind direction plate 1 that rotates in the vertical direction and blows air in different directions perpendicular to the blowing direction Fout ( v ), and the wind direction plate control device 64 causes condensation on the wind direction plate 1. If it is determined that the airflow direction plate 1 is not rotated, the airflow direction plate 1 can be rotated to a position that is larger in the horizontal direction than the dew safety angle θs. There is an effect that it is possible to prevent condensation on the surface of the vertical wind direction plate 1.

  The blown air temperature detection means is a blown air temperature sensor 17 fixed to the blower outlet 14, and the blown air temperature sensor 17 detects the temperature of the air passing through the blower outlet 14, whereby There is an effect that the condensation can be controlled relatively easily.

In addition, when it is determined that no condensation occurs on the wind direction plates 1 and 3, the air direction plates 1 and 3 are rotated to a position that is larger than the dew safety angle θs to make the air flow to the user. The wind direction plates 1 and 3 are directed toward the wind direction so as not to feel the airflow, and the airflow feeling of the blown air is reduced, and a comfortable space can be realized.
Further, after determining that no condensation occurs on the wind direction plates 1 and 3, a position where the rotation angle of the wind direction plates 1 and 3 is larger than the dew safety angle θs with respect to the blowing direction Fout until a predetermined time elapses. Therefore, it is possible to reliably prevent condensation and to control the wind direction plates 1 and 3 with stable movement.

Embodiment 2. FIG.
In the first embodiment, the control of the rotation angle of the vertical wind direction plate 1 is described in detail, but in the present embodiment, the control of the left and right wind direction plate 3 is described. Basically, the control of the left and right wind direction plates 3 is the same as that of the up and down wind direction plate 1 described in the first embodiment.
FIG. 10 is an explanatory diagram showing the rotation angle of the left and right wind direction plates 3 according to the present embodiment, and is a view of only a portion of the left and right wind direction plates 3 in a row as viewed from above. A plurality of right and left wind direction plates 3 are provided along the air outlet 14 formed to extend in the longitudinal direction of the air conditioner, and can be rotated in the horizontal direction. In addition, the structure and control operation | movement of each other part of an air conditioner are the same as that of Embodiment 1.

  In FIG. 10, for example, six left and right wind direction plates 3 are provided in the horizontal direction, FIG. 10A shows all rotating in the same direction, and FIG. And what rotates in a different direction on right and left is shown. Further, as shown in detail in FIG. 11, a horizontal component Fout (h) of the blowing direction Fout from the blower outlet 14 is defined as a reference line Lb, and an angle formed with the reference line Lb is defined as a rotation angle. In the present embodiment, the horizontal component Fout (h) coincides with the direction parallel to the end face of the housing 10. As shown in FIG. 10, the left and right wind direction plates 3 are controlled to be rotatable between 0 and θw, for example, by a stepping motor (not shown), and fixed at 0, θn, and θw. Of course, it can also be controlled to continuously rotate between 0 and θw.

  For example, when a cross-flow blower having a rotating shaft extending in the width direction of the air conditioner is used as the blower 20, the air blown from the blower outlet 14 does not vary so much in the width direction, and is substantially in the direction of the reference line Lb. Blown out. When the rotation angle of the left and right wind direction plates 3 is a position that greatly intersects the blowing direction Fout (h) as θw, a peeling phenomenon occurs on the upstream side of the left and right wind direction plates 3. Due to this peeling phenomenon, the surrounding warm air is entrained in the vortex, and there is a possibility that the left and right wind direction plates 3 cooled by the cold air will come into contact with the surface. Therefore, as in the case of the up-and-down wind direction plate 1, the maximum angle θn at which no peeling phenomenon occurs or no condensation occurs even if the peeling phenomenon occurs is set in advance by a test operation or the like. Here, when 0 to θn is set as the dew safe angle θs on both the left and right sides, and the rotation angle is larger than this, for example, θw, air separation occurs on the upstream surface of the left and right wind direction plates 3 depending on the environmental conditions. there is a possibility. In this embodiment, θn = about 40 degrees and θw = about 50 degrees, but the present invention is not limited to these values.

  Further, when the rotation angle of the left and right wind direction plates 3 in the vicinity of the end surface is too large on the end surface of the housing 10, peeling occurs on the end surface of the housing 10, which may cause condensation. For this reason, it is preferable to set the upper limit of the rotation angle of the left and right wind direction plates 3 in an environment where condensation is likely to occur. Here, the rotation angle θw is set as the upper limit value for both the left and right sides.

  The relationship between the environment in which condensation occurs on the left and right wind direction plates 3 and the temperature of the blown air shows the same change as in FIG. Therefore, as with the up-and-down wind direction plate 1, a test operation is performed under a severe environment that can be considered in the usage environment, for example, a severe environment condition such as indoor temperature and indoor humidity, so that no condensation occurs on the left and right wind direction plates 3. A lower limit value of the air temperature is detected and set as a blown air temperature threshold value. If the blown air temperature is higher than the blown air temperature threshold during operation, no matter what the rotation angle of the left and right wind direction plate 3 is in the range of 0 to θw, This is an environmental condition where no condensation occurs on the side surface of the air outlet 14. In FIG. 7, it represents with the blowing air temperature threshold value Ta, for example, is about 15 degreeC.

  The control operation performed by the wind direction plate control device 64 is the same as that in the case of the vertical wind direction plate 1. For example, in FIG. 8, if it is determined in ST3 that the air temperature is equal to or greater than the threshold value (Ta) of the air temperature and the humidity is high, the left and right wind direction plates 3 are not condensed. It is possible to turn to an angle larger than the safety angle θs, for example, θw. In ST8, it rotates so as to be fixed or continuously moved between 0 to θn which is the dew safety angle θs.

  When the detected blown air temperature is lower than a preset blown air temperature threshold value Ta, the user controls the remote control switch 63 so that the direction of the airflow is larger than the dew-safe angle θs. If desired, in ST6, ST7, ST8, a restriction is added so that the dew-safety angle θs is within the range after a predetermined time has elapsed. The predetermined time is, for example, about 30 to 60 minutes, and even if the left and right wind direction plates 3 are at an angle larger than the dew safety angle θs, a time that is confirmed to be non-condensing is set within the predetermined time. Just keep it. And when the environmental condition which does not condense on the left-right wind direction board 3 reliably comes, the angle of the left-right wind direction board 3 can be rotated to a big angle with respect to the reference line Lb. As a result, it is possible to reliably prevent condensation on the left and right wind direction plates 3 and to prevent water droplets from dropping into the room. Further, by obtaining a threshold value of the blown air temperature in advance, it is possible to prevent dew condensation only by determining the blown air temperature without requiring a humidity sensor. Here, the preset threshold value of the blown air temperature may be the same value as the threshold value of the vertical wind direction plate 1, or may be configured to be controlled separately by setting different threshold values. . In addition, when the dew condensation occurs in the comparison between the blown air temperature and the blown air temperature threshold value, the predetermined duration for allowing the left and right wind direction plates 3 to be an angle larger than the dew safety angle θs is the left and right wind direction plates 3. Different predetermined times may be set according to the rotation angle.

  The same applies to the automatic operation mode shown in FIG. In ST1, it rotates so as to be fixed or continuously moved between 0 to θn which is the dew safety angle θs. If the detected blown air temperature becomes equal to or higher than the temperature Ta set in advance as the blown air temperature threshold and the state continues for 10 minutes or longer as determined in ST3 and ST12, the dew safety angle θs is determined in ST5. It turns to a larger angle, for example, θw.

By carrying out such automatic operation, when the environmental condition that does not condense on the right and left wind direction plates 3 is surely established, the angle of the left and right wind direction plates 3 is rotated to a large angle with respect to the reference line Lb and blown out to a wide angle. . For this reason, it is possible to surely prevent condensation, prevent water droplets from dropping into the room, and widen the left and right wind direction plates 3 to blow cool air into the room. Can be realized.
If the indoor unit is equipped with a sensor that detects the position of the user in the room using, for example, infrared rays, the rotation angle of the left and right wind direction plates 3 is set so that the cool air flows in a direction that avoids the position of the user. do it. Thereby, while being able to prevent dew condensation, it can prevent that cool air flows in the direction where a user exists, and can realize a comfortable space.

  Although the left and right wind direction plates 3 shown in FIG. 10 are arranged in a row in the width direction, the present invention is not limited to this. For example, two or more rows of left and right wind direction plates 3 may be provided. When there are a plurality of rows, a configuration in which the wind direction plates arranged near the blower 20 in the first row are arranged at intervals between the wind direction plates in the second row and partially overlap each other may be employed. When a plurality of left and right wind direction plates 3 are provided, a long air path can be formed by a plurality of rows of wind direction plates, and the flow of wind from the blower 20 can be smoothly guided into the room. For this reason, it controls so that the wind direction board arrange | positioned near the air blower 20 becomes a rotation angle smaller than the wind direction board arrange | positioned on the outer side. Therefore, the rotation angle of the left and right wind direction plates 3 arranged on the outermost side, that is, the farthest from the blower 20 may be controlled so as not to condense.

In the present embodiment, as described above, the wind direction plate is the left and right wind direction plate 3 that rotates in the horizontal direction and blows air in different directions in the horizontal direction with respect to the blowing direction Fout ( h ). When it is determined that condensation does not occur on the wind direction plate 3, the wind direction plate 3 can be rotated to a position that forms a larger angle in the horizontal direction than the dew safety angle θs. When performing the control, it is possible to reliably prevent condensation on the surface of the up-and-down wind direction plate 1 and to realize a space comfortable for the user.

Further, when it is determined that condensation does not occur on the wind direction plate 3, a wide and comfortable space is realized by rotating the wind direction plate 3 to a position that forms a larger angle in the horizontal direction than the dew safety angle θs. There is an effect that can.
Here, even if it is determined that the dew condensation occurs in the environment where the detection value by the blown air temperature detecting means 17 is compared with the threshold value Ta, the wind direction plate 3 is moved with respect to the blowing direction Fout during a predetermined duration. It may be set at a position that forms an angle larger than the dew safety angle θs. That is, it can be determined that condensation does not occur within this predetermined duration.

Embodiment 3 FIG.
In the first and second embodiments, an environmental condition in which condensation occurs is detected based on the blown air temperature. Specifically, the blown air temperature sensor 17 is fixed to the blower outlet 14 and the measurement result of the temperature sensor 17 is used. However, the present invention is not limited to this. The blown air temperature may be estimated based on another state quantity, and a threshold value for this state quantity may be set. Based on this threshold value, the possibility of the occurrence of condensation can be detected, and the rotation angle of the up / down wind direction plate 1 and the left / right wind direction plate 3 can be controlled. In the present embodiment, the blown air temperature is estimated based on the rotation speed of the compressor 50. In addition, although control about the up-down wind direction board 1 is demonstrated here, the case of the left-right wind direction board 3 is also the same. The basic configuration and operation of the air conditioner are the same as those in the first embodiment.

  The cooling capacity of the air conditioner can be changed by using, for example, a compressor 50 whose compressor rotation speed is variable by an inverter. That is, at the start of the cooling operation, the rotational speed of the compressor 50 is increased to lower the indoor temperature as quickly as possible. On the other hand, when the room temperature approaches the indoor target temperature set by the user, an operation is performed to maintain the room temperature by reducing the compressor speed. In order to quickly bring the room to the indoor target temperature at the start of operation, the rotation speed of the blower 20 is increased to increase the amount of blown air, and the rotation speed of the compressor 50 is also increased.

  FIG. 12 is a graph (FIG. 12 (a)) showing a change in the blown air temperature and a graph (FIG. 12 (b)) showing a change in the compressor rotational speed. The relationship between the compressor rotational speed and the blown air temperature is shown. Represents. The compressor speed is controlled by the compressor speed controller 67 based on the blown air temperature, the indoor target temperature, and the like, and the blown air temperature can be estimated from the compressor speed. The blown air temperature gradually increases from T1 until the room temperature approaches the room target temperature. Corresponding to this change, the compressor rotational speed gradually decreases from the highest H1 that requires the most capacity, and when the room temperature falls to an extent that satisfies the indoor target temperature, the capacity necessary to maintain the temperature is obtained. Control with only a low compressor speed. As described in detail in the first embodiment, the test operation is performed in advance under a severe environment considered in the use environment, for example, a severe environment condition such as indoor temperature and humidity, and condensation occurs on the vertical wind direction plate 1. It is assumed that the blown air temperature threshold value Ta is detected as the lower limit value of the blown air temperature. That is, in FIG. 12A, when the blown air temperature threshold Ta is set to about 15 ° C., for example, the compressor rotation speed at this time is set as the compressor rotation speed threshold Ha. Since the blown air temperature decreases as the compressor speed increases, the compressor speed threshold value Ha is an upper limit value of the compressor speed at which dew condensation does not occur in the upper and lower wind direction plates 1. For example, the compressor rotation speed H1 at the start of operation is set to about 100 Hz, and the compressor rotation speed threshold Ha is set to, for example, about 30 Hz. When the compressor rotational speed is operating at a compressor rotational speed threshold value Ha or less, the surface of the vertical wind direction plate 1 can be used regardless of the position of the rotation angle of the vertical wind direction plate 1 in the range from position A to position. This is an environmental condition where no condensation occurs on the top and the side surface of the air outlet 14.

FIG. 13 is a flowchart in the case where the rotational position is controlled so as not to condense on the surface of the upper and lower wind direction plates 1 according to the rotational speed of the compressor.
When the start of cooling operation is instructed by the remote control switch 63, the rotation speed of the compressor 50 is controlled by the compressor speed control device 67, the opening degree of the LEV 52 by the LEV control device 69, and the four-way valve according to the indoor target temperature. The control device 68 sets the switching of the four-way valve 51. Further, the rotational speed of the blower 20 is set by the blower rotational speed control device 65, and the angle of the vertical wind direction plate 1 is set by the wind direction plate control device 64 (ST1). Then, the cooling operation is started. At this time, if the user desires the direction of the air flow to be larger than the range of the dew safety angle θs by the remote control switch 63, the vertical wind direction plate 1 is set in the direction desired by the user. Set. On the other hand, when the user does not particularly desire the direction of the airflow, the angle of the vertical airflow direction plate 1 is limited so as to be within the range of the dew safety angle θs.

  The wind direction plate controller 64 inputs the compressor speed controlled by the compressor speed controller 67 (ST22). Next, the input compressor speed is compared with the compressor speed threshold (Ha) (ST23). In this comparison, when the compressor rotational speed> the compressor rotational speed threshold value (Ha), in the graph shown in FIG. 12B, the compressor rotational speed is still high, and the difference from the indoor target temperature is large. 1 is an environmental condition where condensation occurs. For this reason, when the user desires the direction of the air flow to be an angle larger than the dew safety angle θs by the control of ST6 to ST8, for a predetermined time during which no condensation occurs, for example, 30 minutes to 60 minutes. The vertical wind direction plate 1 is set in a desired direction, and control is performed so that the dew safety angle θs is within the range after a predetermined time has elapsed. If the vertical wind direction plate 1 is within the dew safety angle θs, the angle is maintained and the process returns to ST22.

  If it is determined in ST23 that the compressor rotational speed ≦ the compressor rotational speed threshold (Ha), the compressor rotational speed is controlled to be low, and the up-and-down wind direction plate 1 is controlled even if the indoor temperature approaches the indoor target temperature and the humidity is high. It is an environmental condition where there is no condensation. For this reason, in ST4, the angle of the up-and-down wind direction plate 1 can be rotated to an angle larger than the dew safety angle θs. If the user has set the wind direction so that the remote control switch 63 is positioned at position a, position e, and position, the vertical wind direction plate 1 is rotated in the desired direction in this state. For example, when a swing mode that sequentially changes the wind direction is set, the up-and-down wind direction plate 1 that has been moved from position b to position d until now is moved from position i to position d. Is possible. The subsequent processing further returns to the input of the compressor rotational speed (ST22).

  By performing such control, the angle of the vertical wind direction plate 1 can be rotated to a large angle with respect to the direction of the blown-out air Fout (v) when the environmental condition is surely not condensed on the vertical wind direction plate 1. Therefore, dew condensation can be surely prevented and water droplets can be prevented from dripping into the room. Further, by setting the compressor rotation speed threshold value Ha that can estimate the blown air temperature in advance, it is possible to prevent condensation only by determining the compressor rotation speed. Can be controlled.

  Here, the case where the rotation angle of the up-and-down wind direction plate 1 is controlled has been described, but the control of the left-right wind direction plate 3 is the same as in the second embodiment. Instead of detecting the blown air temperature and controlling the rotation angle of the left and right wind direction plates 3 based on the blown air temperature threshold value, the compressor rotational speed at which the blown air temperature can be estimated is input and based on the compressor rotational speed threshold value. Thus, the rotation angle of the left and right wind direction plates 3 may be controlled. The same applies to the automatic operation mode of the air conditioner shown in FIG. 9. If the compressor rotation speed threshold value Ha is used instead of the determination with the blown air temperature and the blown air temperature threshold value Ta in ST2 and ST3, The same effect is produced.

  In addition, when an air blower 20 that can be operated by setting the number of rotations in several stages using, for example, a brushless motor or the like, indoor air conditioning can be efficiently performed in accordance with the operation state. That is, at the start of the cooling operation, in order to quickly bring the room to the set temperature, the rotation speed of the blower 20 is increased to increase the amount of blown air, and the rotation speed of the compressor 50 is also increased to perform an operation with high cooling capacity. . Then, when the room temperature approaches the indoor target temperature set by the user, an operation is performed to maintain the room temperature by decreasing the compressor rotation speed and reducing the amount of blown air. In addition, the air volume is variable in several stages according to the user's request via the remote control switch 63, and the rotation speed of the blower 20 is determined according to the set air volume. Depending on the number of rotations of the blower 20, the blown air temperature and the peeled state of the vertical wind direction plate 1 are different. Here, for example, if the blown air temperature is the same, the compressor speed is high when the air volume is large, and the compressor speed is low when the air volume is small. That is, in the control process shown in FIG. 13, the threshold Ta of the blown air temperature is set to one, but if the rotation speed of the blower 20 changes, even if the detected rotation speed of the compressor is less than Ha, dew condensation occurs on the vertical wind direction plate 1. Will do. For example, even if it is confirmed that the amount of air is not condensed as Fa, and the threshold value of the compressor speed is set, if the air amount is smaller than Fa, the upper and lower wind direction plates 1 are easily peeled off and vortices are generated. Condensation is likely to occur. Therefore, having at least two or more threshold values for the compressor rotation speed according to the rotation speed of the blower 20 can surely prevent condensation on the wind direction plate and reduce the frequency that the user feels the airflow. Can be improved.

  FIG. 14 is a graph illustrating the setting of the threshold value of the compressor rotational speed when the rotational speed of the blower 20 is changed in three stages. Here, the threshold value of the compressor speed at the time of the air volume Fb is Hb, the threshold value of the compressor speed at the time of the air volume Fc is Hc, and different values are set such that Hb> Hc when Fb> Fc. . For example, after the cooling operation is started, the rotational speed of the blower 20 is controlled to be reduced stepwise in three stages. In the lower graph of FIG. 14, the horizontal axis represents time, and the vertical axis represents air volume. In the upper graph of FIG. 14, the vertical axis represents the compressor rotation speed with respect to the time on the horizontal axis. When the air volume is Fb, the compressor rotation speed becomes less than the compressor rotation speed Hb at that air volume, so that the rotation angle of the wind direction plates 1 and 3 is rotated to an angle larger than the dew safety angle θs at time Ma. Make it possible. After that, when the rotational speed of the blower 20 is decreased at time Mc and the air volume is operated by Fc, the compressor rotational speed is higher than the compressor rotational speed threshold Hc for the air volume Fc at the time of MC. The rotation angle is again rotated within the dew safety angle θs. Further, when the compressor rotational speed becomes equal to or less than the compressor rotational speed threshold Hc at the air volume Fc at time Mb with time, the rotational angle of the wind direction plates 1 and 3 is set to an angle larger than the dew safety angle θs. Turnable.

  When controlled in this way, it is possible to prevent condensation on the wind direction plates 1 and 3 and to realize a more comfortable space as compared with the case where control is performed with one compressor rotation speed threshold Hc. For example, in the case of a user who does not want to be exposed to the cold air, the up-and-down wind direction plate 1 can be directed upward as shown in the position a from time Ma to time Mc. Similarly, in the case of a user who wants to feel cool air, the up-and-down airflow direction plate 1 can be directed downwards from position Ma to time Mc like position e and h.

As described above, at least two or more threshold values for the compressor rotation speed are set in accordance with the rotation speed of the blower 20, and the rotation angle of the vertical wind direction plate 1 is set based on the air volume and the compressor rotation speed threshold value for the air volume. If controlled, the user's wish can be satisfied as much as possible and a comfortable space can be provided.
Here, an example in which two threshold values are set is described, but the present invention is not limited to this. If more threshold values are provided according to the air volume, that is, the number of rotations of the blower 20, and further controlled, the user's Satisfaction can be improved and a comfortable space can be obtained.

  In the present embodiment, as described above, the blown air temperature detecting means is means for detecting the rotational speed of the compressor 50, here, the compressor rotational speed control device 67, and the rotational speed of the compressor 50 detected thereby. By estimating the air temperature passing through the air outlet 14 from the air outlet, there is an effect that it is possible to control the prevention of condensation on the wind direction plates 1 and 3 relatively easily.

  In addition, after the refrigerant 30b, the evaporator 30a, and the refrigeration cycle having the compressor 50 that compresses the refrigerant flowing in the condenser 30b and the evaporator 30a, and the air sucked from the suction port 11 are heat-exchanged by the evaporator 30a. A blower 20 that blows air to the blower outlet 14, a wind direction plate 1, 3 that is rotatably provided at the blower outlet 14 and blows air in a direction different from the blowout direction Fout of air blown from the blower outlet 14 by the blower 20, and compression The compressor rotation speed control device 67 for controlling the rotation speed of the compressor 50 and the upper limit of the compressor rotation speed when no condensation occurs in the wind direction plates 1 and 3 are set in advance as the rotation speed threshold value Ha, and the rotation of the compressor 50 A wind direction plate control device 64 that controls the rotation of the wind direction plates 1 and 3 based on the number of rotations and the rotation speed threshold value Ha, and when the compressor rotation speed is higher than the rotation speed threshold value, the wind direction plates 1 and 3 are Blowing direction F When the rotation speed is lower than the rotation speed threshold value Ha, the wind direction plates 1 and 3 are moved vertically or below the dew safety angle θs. By providing an operation mode that rotates to a position that makes a large angle in the left-right direction, it is possible to reliably prevent the occurrence of condensation on the wind direction plates 1, 3 regardless of the shape of the wind direction plates 1, 3, and There is an effect that can realize a comfortable space without feeling cold.

  Moreover, the air blower 20 shall be variable in air volume, and the air conditioner which can provide the comfortable space which can satisfy a user further by setting the rotation speed threshold value of 2 or more according to an air volume is obtained.

Embodiment 4 FIG.
In the fourth embodiment of the present invention, the blown air temperature is estimated from the piping temperature of the heat exchanger 30a, the possibility of dew condensation is detected based on the piping temperature threshold value of the heat exchanger 30a, and the vertical wind direction plate 1 and the rotation angle of the left and right wind direction plates 3 are controlled. The basic configuration and operation of the air conditioner are the same as those in the first embodiment. Further, this is a case of a cooling operation or a dehumidifying operation in which the heat exchanger 30a is operated as an evaporator and the heat exchanger 30b is operated as a condenser.

  FIG. 15 is a graph (FIG. 15 (a)) showing the change in the blown air temperature and a graph (FIG. 15 (b)) showing the change in the piping temperature of the evaporator 30a. Represents a relationship. When the refrigeration cycle is operated according to the compressor rotational speed, the indoor temperature, the indoor target temperature, the load, etc., the evaporator piping temperature is the temperature of the refrigerant flowing in the evaporator 30a. As shown in FIG. That is, the blown air temperature gradually increases from T1, for example, about 10 ° C. until the room temperature approaches the indoor target temperature, and the evaporator piping temperature gradually increases from T2, for example, about 7 ° C. in response to this change. . As described in detail in the first embodiment, the test operation is performed in advance under a severe environment considered in the use environment, for example, a severe environment condition such as indoor temperature and humidity, and condensation occurs on the vertical wind direction plate 1. The lower limit of the blown air temperature is detected as the threshold value Ta. Assuming that the blown air temperature threshold Ta, for example, about 15 ° C., the evaporator piping temperature of M1, for example, about 10 ° C. is set as the evaporator piping temperature threshold Tb. The evaporator pipe temperature threshold value Tb is a lower limit value of the evaporator pipe temperature when no condensation occurs on the wind direction plate 1. That is, when the evaporator pipe temperature is operating at the evaporator pipe temperature threshold Tb or more, no matter what the rotation angle of the vertical wind direction plate 1 is, on the surface of the vertical wind direction plate 1 and the outlet 14. It is an environmental condition where there is no condensation on the side of

  FIG. 16 is a side cross-sectional configuration diagram of the indoor unit according to the present embodiment. In the figure, 18 is a pipe temperature sensor fixed to, for example, the fin 31 of the evaporator 30a, and measures the evaporator pipe temperature. Usually, the heat exchanger of the refrigeration cycle is provided with a pipe temperature sensor for viewing the refrigerant state. This is, for example, in the downstream part of the refrigerant pipe in the heat exchanger, and the pipe temperature in that part is detected and used for controlling the refrigerant flow rate, the compressor rotation speed, and the like. Here, the detection value of the pipe temperature sensor 18 provided normally may be used. 16, the same reference numerals as those in FIG. 2 denote the same or corresponding parts, and the description thereof is omitted here.

FIG. 17 is a flowchart in the case where the rotational position is controlled so as not to condense on the surface of the vertical wind direction plate 1 according to the piping temperature of the evaporator 30a, and shows, for example, a process performed by the wind direction plate control device 64.
When the start of cooling operation is instructed by the remote control switch 63, the rotation speed of the compressor 50 is controlled by the compressor speed control device 67, the opening degree of the LEV 52 by the LEV control device 69, and the four-way valve according to the indoor target temperature. The control device 68 sets the switching of the four-way valve 51. Further, the rotational speed of the blower 20 is set by the blower rotational speed control device 65, and the angle of the vertical wind direction plate 1 is set by the wind direction plate control device 64 (ST1). Then, the cooling operation is started. At this time, if the user desires the direction of the air flow to be larger than the range of the dew safety angle θs by the remote control switch 63, the vertical wind direction plate 1 is set in the direction desired by the user. Set. On the other hand, when the user does not particularly desire the direction of the airflow, the angle of the vertical airflow direction plate 1 is limited so as to be within the range of the dew safety angle θs.

  The wind direction plate control device 64 detects the evaporator piping temperature measured by the piping temperature sensor 18 (ST32). Next, the detected evaporator piping temperature is compared with the evaporator piping temperature threshold (Tb) (ST33). In this comparison, when the evaporator piping temperature <the evaporator piping temperature threshold (Ta), in the graph shown in FIG. 15B, the piping temperature is still low and the compressor rotational speed is high, and the difference from the indoor target temperature. This is also an environmental condition in which condensation occurs on the up-and-down wind direction plate 1. For this reason, when the user desires the direction of the air flow to be an angle larger than the dew safety angle θs by the control of ST6 to ST8, for a predetermined time during which no condensation occurs, for example, 30 minutes to 60 minutes. The vertical wind direction plate 1 is set in a desired direction, and control is performed so that the dew safety angle θs is within the range after a predetermined time has elapsed. If the vertical wind direction plate 1 is within the dew safety angle θs, the angle is maintained and the process returns to ST32.

  If it is determined in ST33 that the evaporator pipe temperature ≧ the evaporator pipe temperature threshold value (Tb), the compressor rotational speed is controlled to be low, and the up / down wind direction plate 1 even if the room temperature approaches the indoor target temperature and the humidity is high. It is an environmental condition where there is no condensation. For this reason, in ST4, the angle of the up-and-down wind direction plate 1 can be rotated to an angle larger than the dew safety angle θs. When the user has set the wind direction so that the remote control switch 63 is positioned at the position A, position E, and position shown in FIG. 4, the vertical wind direction plate 1 is rotated in the desired direction in this state. For example, when a swing mode that sequentially changes the wind direction is set, the up-and-down wind direction plate 1 that has been moved from position b to position d until now is moved from position i to position d. Is possible. The subsequent processing further returns to the input of the evaporator piping temperature (ST32).

  By performing such a control, the angle of the vertical wind direction plate 1 can be rotated to a large angle with respect to the blown air direction Fout when the environmental condition in which the dew condensation does not occur reliably on the vertical wind direction plate 1 is ensured. Condensation can be prevented and water droplets can be prevented from dripping into the room. In addition, by setting an evaporator pipe temperature threshold that can estimate the blown air temperature in advance, dew condensation can be prevented only by determining the evaporator pipe temperature. Can be controlled.

  Here, the case where the rotation angle of the up-and-down wind direction plate 1 is controlled has been described, but the control of the left-right wind direction plate 3 is the same as in the second embodiment. Instead of detecting the blown air temperature and controlling the rotation angle of the left and right wind direction plates 3 based on the blown air temperature threshold, the evaporator pipe temperature that can estimate the blown air temperature is detected and based on the evaporator pipe temperature threshold. Thus, the rotation angle of the left and right wind direction plates 3 may be controlled. The evaporator pipe temperature threshold value may be the same value for the up-and-down wind direction plate 1 and the left and right wind direction plate 3, or different threshold values may be obtained depending on the shape of the wind direction plate. The same applies to the automatic operation mode of the air conditioner shown in FIG. 9. Instead of determining with the blown air temperature and the blown air temperature threshold Ta in ST2 and ST3, the evaporator pipe temperature and the evaporator pipe temperature are used. If the threshold value Tb is used, the same effect can be obtained.

  In the present embodiment, as described above, the blown air temperature detecting means is the pipe temperature sensor 18 fixed to the evaporator 30a, and the air temperature passing through the outlet 14 is estimated from the pipe temperature detected by the pipe temperature sensor 18. By doing so, it is possible to control the prevention of dew on the wind direction plates 1 and 3 relatively easily. Even in this case, even if it is determined that the dew condensation is caused by comparing the detection value by the pipe temperature sensor 18 with the threshold value Tb, the wind direction plates 1 and 3 are moved with respect to the blowing direction Fout during a predetermined duration. It may be set at a position that forms an angle larger than the dew safety angle θs. That is, it can be determined that condensation does not occur within this predetermined duration.

  In the first to fourth embodiments, the cooling operation has been described in detail. However, the present invention can be applied to an air conditioner having a cooling / heating function and an air conditioner having a dehumidifying function. Moreover, although the separator type air conditioner divided | segmented into the indoor unit and the outdoor unit was demonstrated, it is applicable also to an integral type, for example, a window type air conditioner.

  Moreover, although the lower limit of the blowing air temperature and the upper limit of the compressor rotation speed when no condensation occurs on the wind direction plates 1 and 3 are set in advance as the threshold, the blowing air that may cause condensation on the wind direction plates 1 and 3 The same applies if the upper limit of the temperature or the lower limit of the compressor speed is set. For example, when the upper limit of the blown air temperature at which condensation may occur on the wind direction plates 1 and 3 is set as a threshold, it is determined that no condensation occurs on the wind direction plates 1 and 3 when the blown air temperature becomes higher than the threshold. What is necessary is just to make it possible to rotate the rotation angle of the board 1 and 3 to the position which makes an angle larger than a dew safety angle.

In each of Embodiments 1 to 4, numerical values are described as threshold values, but the present invention is not limited to this. For example, the evaporator pipe temperature threshold value varies depending on the refrigerant, and varies depending on the shape of the wind direction plates 1 and 3.
Moreover, although the air conditioner provided with both the upper and lower wind direction plates 1 and the left and right wind direction plates 3 has been described, the present invention can also be applied to an air conditioner having either one of the wind direction plates.

It is a refrigerant circuit diagram which shows typically the structure of the air conditioner which concerns on Embodiment 1 of this invention. It is a longitudinal cross-sectional view which shows typically the indoor unit of the air conditioner which concerns on Embodiment 1 of this invention, and shows the figure which looked at the cross section in a center part from the side surface side. It is a block diagram which shows roughly the control apparatus of the air conditioner which concerns on Embodiment 1 of this invention. It is explanatory drawing which concerns on Embodiment 1 of this invention and shows the rotation angle of an up-down wind direction board. It is explanatory drawing which concerns on Embodiment 1 of this invention and shows the relationship between the rotation angle of an up-and-down wind direction board, and dew condensation. It is a longitudinal cross-sectional view which shows typically the indoor unit of the air conditioner which concerns on Embodiment 1 of this invention, and shows the case where the rotation angle of an up-down wind direction board is upward. FIG. 5 is a graph according to Embodiment 1 of the present invention and showing changes in the blown air temperature with respect to time from the start of the cooling operation. 7 is a flowchart according to Embodiment 1 of the present invention in a case where the rotational position is controlled so as not to condense on the surface of the wind direction plate according to the blown air temperature. FIG. 6 is a flowchart according to Embodiment 1 of the present invention in the case where the rotational position is controlled so that the user does not want to hit the cold and the up-and-down wind direction plate faces upward and does not condense on the surface of the wind direction plate. It is explanatory drawing which concerns on Embodiment 2 of this invention, and shows a structure when a left-right wind direction board is seen from the top | upper surface of a housing | casing. It is explanatory drawing which concerns on Embodiment 2 of this invention and shows the rotation angle of a left-right wind direction board. It is a graph (Drawing 12 (a)) showing change of blown air temperature and a graph (Drawing 12 (b)) showing change of compressor rotation speed concerning Embodiment 3 of the present invention. It represents the relationship with the blown air temperature. It is a flowchart in the case of controlling the rotation position according to Embodiment 3 of the present invention so as not to condense on the surface of the wind direction plate according to the compressor rotation speed. It is a graph which concerns on Embodiment 3 of this invention, and demonstrates the relationship between the change of a compressor rotation speed when changing the rotation speed of an air blower in three steps, and the change of an air volume. It is a graph (Drawing 15 (a)) showing change of blowing air temperature and a graph (Drawing 15 (b)) showing change of evaporator piping temperature concerning Embodiment 4 of the present invention, and heat exchanger piping temperature. And the relationship between the blown air temperature. It is a longitudinal cross-sectional view which shows typically the indoor unit of the air conditioner which concerns on Embodiment 4 of this invention. It is a flowchart in the case of controlling the rotation position according to Embodiment 4 of the present invention so as not to condense on the surface of the wind direction plate according to the piping temperature of the heat exchanger.

Explanation of symbols

1, 1a, 1b Vertical wind direction plate 3, 3a, 3b Left and right wind direction plate 5 Vortex generated by peeling 6 Vortex generated by peeling 10 Case 11 Suction port 13 Nozzle 14 Blowing port 15 Rear guide plate 17 Blowing air temperature sensor 18 Evaporation Pipe temperature sensor 20 Blower 30a Evaporator 30b Condenser 50 Compressor 64 Wind direction plate control device 65 Blower rotation speed control device 67 Compressor rotation speed control device

Claims (4)

A refrigeration cycle having a condenser, an evaporator, and a compressor that compresses the refrigerant flowing through the condenser and the evaporator;
The rotational speed can be varied in a plurality of stages, a blower for blowing to blow into the room from the air outlet after the indoor air sucked from the suction port during the cooling operation is heat exchanged in the evaporator,
A wind direction plate that is rotatably provided at the air outlet, and that allows air to be blown in a different direction with respect to the direction of air blown out from the air outlet by the blower according to the rotation angle ;
A compressor rotation speed control device for controlling the rotation speed of the compressor;
A louver controlling device for controlling the turning angle of the front Symbol louver,
And a timer ,
The wind direction plate control device,
At the start of cooling operation, the wind direction plate is set to a rotation angle that forms a safety angle with dew that is an angle within a predetermined range with respect to the blowing direction,
During the cooling operation, the rotation speed of the compressor is input from the compressor rotation speed control device, and the compressor rotation speed when the input compressor rotation speed and the preset wind direction plate do not cause dew condensation. Compare the compressor speed threshold that is the upper limit of the speed ,
If the compressor rotation speed is equal to or less than the compressor rotation speed threshold when the timer is released, the timer is set, and the compressor rotation speed is equal to or less than the compressor rotation speed threshold using the timer. when it is determined that the elapsed predetermined time in a state, along with rotating the wind direction plate to release the timer position forming a not large rotational angle than the dew safety angle,
If the compressor rotation speed is greater than the compressor rotation speed threshold with the timer set, the timer is canceled and the rotation angle of the wind direction plate is maintained at the dew-safe angle. Or to return to the dew safety angle,
And the said compressor rotation speed threshold value is set with two or more according to the rotation speed of the said air blower, The air conditioner characterized by the above-mentioned . A refrigeration cycle having a condenser, an evaporator, and a compressor that compresses the refrigerant flowing through the condenser and the evaporator;
The rotational speed can be varied in a plurality of stages, a blower for blowing to blow into the room from the air outlet after the indoor air sucked from the suction port during the cooling operation is heat exchanged in the evaporator,
A wind direction plate that is rotatably provided at the air outlet, and that allows air to be blown in a different direction with respect to the direction of air blown out from the air outlet by the blower according to the rotation angle ;
A compressor rotation speed control device for controlling the rotation speed of the compressor;
A louver controlling device for controlling the turning angle of the front Symbol louver,
And a timer ,
The wind direction plate control device,
At the start of cooling operation, the wind direction plate is set to a rotation angle that forms a safety angle with dew that is an angle within a predetermined range with respect to the blowing direction,
During the cooling operation, the rotation speed of the compressor is input from the compressor rotation speed control device, and the compressor rotation speed when the input compressor rotation speed and the preset wind direction plate do not cause dew condensation. Compare the compressor speed threshold that is the upper limit of the speed ,
If the compressor rotation speed is equal to or less than the compressor rotation speed threshold when the timer is released, the timer is set, and the compressor rotation speed is equal to or less than the compressor rotation speed threshold using the timer. when it is determined that the elapsed predetermined time in a state, along with rotating the wind direction plate to release the timer position forming a not large rotational angle than the dew safety angle,
If the compressor rotation speed is greater than the compressor rotation speed threshold with the timer set, the timer is canceled and the rotation angle of the wind direction plate is maintained at the dew-safe angle. Or an air conditioner that returns to the safe angle with dew . A refrigeration cycle having a condenser, an evaporator, and a compressor that compresses the refrigerant flowing through the condenser and the evaporator;
A blower for blowing to blow into the room from the air outlet of the indoor air sucked from the suction port during the cooling operation after is heat exchanged by the evaporator,
A wind direction plate that is rotatably provided at the air outlet, and that allows air to be blown in a different direction with respect to the direction of air blown out from the air outlet by the blower according to the rotation angle ;
And outlet air temperature detecting means that gives detects the outlet air temperature passing through the air outlet,
A wind direction plate control device for controlling a rotation angle of the wind direction plate;
And a timer,
The wind direction plate control device,
At the start of cooling operation, the wind direction plate is set to a rotation angle that forms a safety angle with dew that is an angle within a predetermined range with respect to the blowing direction,
During cooling operation, it compares the outlet air temperature which the outlet air temperature detecting means detects, and outlet air temperature threshold value is a lower limit of the outlet air temperature when no condensation on the wind direction plate that is set in advance,
If the blown air temperature is equal to or greater than the blown air temperature threshold when the timer is released, the timer is set, and the timer is used to set the blown air temperature to the blown air temperature threshold for a predetermined time. older than when it is determined that, with pivoting to a position which forms a not large turning angle than safety angled front Symbol dew said wind direction plate to release the timer,
If the blower air temperature is less than the blown air temperature threshold with the timer set, the timer is canceled and the rotation angle of the wind direction plate is maintained at the dew safety angle, or An air conditioner that returns to the safe angle with dew . The wind direction plate is a vertical wind direction plate that rotates in a vertical direction and allows air to be blown in a direction different from the direction perpendicular to the blowing direction.
The louver controlling apparatus, when rotating the horizontal flaps at a position that forms a large rotational angle than the dew safety angle, uppermost position within the pivoting range the vertical airflow direction plate The air conditioner according to any one of claims 1 to 3, wherein the air conditioner is rotated.

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