JP2553644B2 - Ceiling embedded air conditioner - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an air conditioner, and more particularly to control of the direction of air blown from the air conditioner.

Conventional Technology Conventional technology will be described with reference to FIGS. 7 to 9. Reference numeral 1 denotes an indoor unit of a ceiling-embedded air conditioner, which is fixed to a ceiling wall 2 by a fixing bolt 3, and a lower surface of the indoor unit 1 is opened substantially flush with a ceiling 4. The indoor unit 1 is composed of an outer shell 5 and a lower surface grill 6, inside which indoor heat exchangers 7a and 7b of a cooling system are installed, and a blower 8 is installed so that heat can be exchanged with each of them. .

A rectangular inlet 10 is provided at the center of the lower grill 6, and blow grills 11a and 11b are provided around the inlet 10. Approximately half of the air blown out from the blower 8 is
After passing through, it passes through the outlet grill 11a and blows obliquely downward and forward. The remaining air blown from the blower 8 passes through the heat exchanger 7b, passes through the blow grill 11b, and blows obliquely downward and forward.

In addition, movable louvers 12a and 12b are installed to control the direction of each blown air. Further, a remote control type temperature setting means 100 is provided so that the user can set an arbitrary room temperature. Inside the suction port 10, a suction temperature detecting means 13 is fixedly installed, and while measuring the suction temperature, a temperature difference from the set temperature by the temperature setting means 100 is detected, and the cooling system is turned on and off in the room. It keeps almost uniform.

The operation of the conventional ceiling-embedded air conditioner thus configured will be described.

Generally, the ceiling-embedded air conditioner of the present invention is often installed in the ceiling of an office, a store, or a living room.
14. Adjust the temperature.

The chamber 14 is composed of a ceiling 4, side walls 15 and 16, and a floor 17. The space enclosed by the two-dot chain line in FIG. 8 is the living area, and ASHRAE's STANDARD defines a space that is 1800 mm or less in height and 600 mm or more from the side wall as the living area.
In other words, humans are generally defined as living in this residential area.

At this time, as shown in FIG. 8, the stream of the blown air blows the air warmed by the heat exchangers 7a and 7b (cooled at the time of cooling) from the blow grills 11a and 11b downward. After the interior of the room 14 is heated (cooled) so as to draw a large arc in the area, the air is sucked from the central suction port 10 of the indoor unit 1. At this time, the blown airflows a and b have substantially the same blown air volume and blowout direction, and the streamlines of the airflows a and b draw substantially the same arc.

By detecting the temperature of the sucked air by the suction temperature detecting means 13 in this way, the blown air temperature is adjusted and the average temperature in the living area of the room 14 is maintained at a substantially set temperature.

Problems to be Solved by the Invention The ceiling of a store, office, or living room is 2.5 to 3 mm from the floor
When the indoor unit is installed at this position, the temperature of the air blown from the indoor unit is sent into the living area to maintain a good temperature distribution. There must be. For this reason, for a person in the vicinity of the outlet, the blowing air may hit the head or face and cause discomfort, or the development may be perceived to be cold.
There was a problem that a high-level comfortable space could not be provided.

In addition, especially during heating, due to the effect of the specific weight of air, high-temperature air stagnates near the ceiling, which wastes heat near the ceiling above the living area, which is the range of human activity. There was a problem that the heating was bad and the running cost was high.

The present invention calculates the indoor heat load from the set temperature and the intake air temperature, and detects the temperature imbalance in the living area from the radiant temperature of the floor in the living area and the ambient temperature in the vicinity of the radiant temperature detecting means. When both are smaller than the preset value, that is, when approaching a steady operation state, the air outlet angle of the air conditioner is blown out substantially horizontally to the ceiling surface, and at other times, the air outlet angle is set diagonally downward. An object is to provide an air conditioner that controls so that it blows out to the air.

Means for Solving the Problems In order to achieve the above object, the air conditioner of the present invention,
Calculates the temperature imbalance from both the radiation temperature output of the floor from the radiation temperature detection means and the ambient temperature output from the ambient temperature detection means provided near the radiation temperature detection means, and also from the intake air temperature and the set temperature output. Calculate the heat load in the room.
Only when both the temperature imbalance and the heat load in the room are smaller than a preset value, the blowing angle of the air blown from the air conditioner is set to be substantially horizontal to the ceiling surface, and the other directions are set to obliquely downward blow. Control. That is, when there is a large difference between the room temperature and the set temperature, such as at the start of operation, or when the floor temperature is extremely low even when the room temperature approaches the set temperature, the air is blown obliquely downward to control the temperature far inside the living area. To control. Further, it has a blowout angle switching means for setting the blowout to be substantially horizontal to the ceiling surface when the temperatures of the room temperature, the floor surface and the like are almost set temperature.

Action The present invention has the above-mentioned configuration to detect the temperature of the intake air and the set temperature to determine the amount of heat load in the room, and the temperature imbalance detection means to detect the temperature of the living area and the temperature of the floor surface. When the heat load amount or the temperature unbalance is large, the blowing angle switching unit blows out diagonally downward, and when the heat load amount or the temperature unbalance is small. By controlling so that it blows out almost horizontally with the ceiling surface by the blowing angle switching means, there is a large difference between the heat load amount, the living area air temperature, and the temperature of the floor surface, etc., as in the initial stage of operation, and the living area is quickly opened. When you want to cool or heat the air, blow it diagonally downward and control the temperature for a short time. If the room temperature becomes stable, the difference between the room temperature and the set temperature will decrease, and the temperature imbalance will also decrease, and the blowing angle will be approximately horizontal to the ceiling surface, so strong winds will hit people in the living area and cause discomfort. Prevent from doing. Also, at this time, the blowing air blows along the ceiling surface, so the wind speed is difficult to slow down, and the ceiling → side walls → floor →
A large circulation of the entire room called the air conditioner blow-in port is generated to uniformly control the temperature of the entire room. Further, particularly in the heating operation, it becomes possible to carry hot air, which tends to accumulate near the ceiling above the living area, into the living area by a substantially horizontal blowing flow.

In addition, if there is a shield (such as a library or fluorescent lamp) on the side wall or ceiling that obstructs convection, it will not be circulated near the floor and the temperature difference between the floor temperature and the set temperature will be large. Even in such a case, the radiant temperature detecting means detects that there is a large imbalance between the air temperature in the living area and the temperature in the floor, so that the air blows out obliquely downward and the temperature in the living area can be maintained near the set temperature.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 to 6. The description of the same components as the conventional one is omitted,
Only the differences will be described.

FIG. 1 is a block diagram showing an embodiment of the present invention, in which 18 is an indoor temperature setting means, 19 is an intake air temperature detecting means provided inside the blowing grille 10, and the temperature of the intake air above the chamber 14 is shown. To detect.

Further, 20 is a radiation temperature detecting means, which is a heat insulating outer shell 21,
It is composed of a concave mirror 22 made of aluminum that opens downward and a radiation temperature thermistor 23 provided near the focal point of the concave mirror 22. Further, the ambient temperature detecting means 24 is installed in a hole provided integrally with the radiation temperature detecting means 20 in a concave shape, and the ambient temperature detecting means 24 should not be installed in the concave mirror 22. The radiant temperature detecting means 20 and the ambient temperature detecting means 24 are installed downward so as to detect the temperature of the floor 17 in the vicinity of the side of the suction grill 10 of the lower surface grill 6, and the radiant temperature detecting means 20 controls the floor temperature and The temperature affected by the surface temperature of a desk or the like placed in the living area is detected, and the ambient temperature detecting means (24) detects the temperature around the radiation temperature detecting means (20).

The temperature signal thus detected is sent to the control device 25. The control device comprises a heat load amount calculation means 26, a temperature imbalance detection means 27, a blowout angle determination means 28, and blowout angle switching means 29a, 29b. The heat load amount calculating means 26 is an intake air temperature detecting means 19 and an indoor temperature setting means.
The heat load amount is calculated based on the temperature signal from 18, and the temperature imbalance detection means 27 is based on the temperature signal from the radiation temperature detection means 20 and the temperature signal from the ambient temperature detection means 24. It is to detect the temperature imbalance. Then, the blowing angle determining means 28 determines whether the blowing angle is the blowing angle parallel to the ceiling 4 or the downward blowing angle to the floor surface 17 based on the output signals of the heat load calculating means 26 and the temperature imbalance detecting means 27. It is a judgment.

The blowing angle switching means 29a, 29b change the angles of the louvers 12a, 12b based on the blowing angle setting signal sent from the blowing angle determining means 28.

The blow-out angle switching means 29a is a pulse motor 31a with a motor shaft 30a having a female thread at the tip as shown in FIG.
A louver drive shaft 32a having one end pivotally supported on the tip of the louver 12a and the other end having an external thread cut off.The female screw of the louver is screwed into the female screw of the motor shaft 30a. .

Next, the operation of the air conditioner configured as above will be described with reference to the flowchart of FIG.

After the person using the room 14 turns on the power of the air conditioner 1, the temperature is set to a desired room temperature Tset in step 33, and the operation of the air conditioner is started.

Further, in step 34, the intake air temperature is detected by the intake air temperature detecting means 13 provided substantially inside the central portion of the intake grill 10.
Detect T ₀ . Then, in step 35, the radiation temperature detecting means
The radiant temperature Tr of the floor or the desk below the indoor unit body 1 is detected by the 20. At the same time, the temperature around the radiation temperature detection means 20
The ambient temperature detecting means 24 detects Ta.

In step 36, first, the heat load amount ΔTl is calculated by the following equation from both the intake air temperature T ₀ and the set temperature Tset.

ΔTl = | T ₀ −Tset | Then, a reference heat load amount ΔTl set in advance (here, Δtl = 5 ° C. is assumed) is compared with the calculated heat load amount ΔTl (step 37). Here, when the heat load amount ΔTl is larger than the reference heat load amount Δtl = 5 ° C., that is, when the absolute value of the difference between the intake air temperature T ₀ and the set temperature Tset is 5 ° C. or more, that is, when the temperature inside the room exceeds the set temperature. When it is out of the way, it proceeds to No side, and it is determined that the angles of the louvers 12a and 12b from the ceiling surface are set to be large (step 38), and the blowout state is obliquely downward. On the other hand, when the difference ΔTl between the intake air temperature T ₀ and the set temperature Tset is smaller than the reference heat load ΔTl = 5 ° C,
Proceed to step 39 on the YES side. In step 39, the temperature imbalance ΔTa is calculated by the following equation ΔTa = | Tr−Ta | from the radiation temperature Tr detected in step 35 and the ambient temperature Ta. Then, in step 40, the preset reference temperature unbalance Δta (here, Δta =
8 ° C.) and the temperature imbalance ΔTa. If the temperature unbalance ΔTa is larger than the reference temperature unbalance Δta, that is, if the floor temperature is significantly different from the temperature in the living area, such as during start-up operation, proceed to the No side and move the louver. It is determined that the angles of 12a and 12b from the ceiling surface are set to be large and the air flows downward obliquely (step 38). As a result, the angles of the louvers 12a and 12b should be adjusted more during the start-up operation such as in the initial stage of operation, or during operation with a high load such that the difference between the floor temperature and the living area temperature is very large due to obstacles. Since it is large, the temperature-controlled air can be blown directly into the living area as shown in FIG. 5, and the living area can be brought close to the set temperature quickly. When the temperature of the chamber 14 approaches the set temperature, the heat load amount ΔTl and the temperature imbalance ΔTa gradually decrease, and the heat load amount ΔTl is smaller than the reference heat load amount Δtl. The balance ΔTa is smaller than the reference temperature imbalance Δta. As a result, step
At 40, it is determined that the louvers 12a, 12b are to be set at a small angle by moving to the YES side (step 41). Then, in step 42, the louvers 12a and 12b are blown by the blowing angle switching means 29a and 29b.
Drive and set the blowing direction so that it is substantially horizontal to the ceiling surface. Therefore, the blown air flows along the ceiling 4 as shown in FIG. 6 and hits the upper portions of the opposite side walls 15 and 16. Then, the colliding flow changes to a downward flow, and the side walls 15,1
It flows down along 6. Then, after reaching the floor 17, the floor 17 is expanded and is sucked through the suction port 10 of the indoor unit 1 to generate a large circulation in the entire room 14. As a result, strong wind did not occur in the living area,
It is possible to softly control the temperature from the outer shell close to the wall.

According to the above-described embodiment, when the heat load is large or the temperature imbalance is large, that is, when the operation is started, the temperature is controlled within the living area by directing the blowing direction toward the front floor surface. Control the air so that it reaches the desired temperature quickly. On the other hand, when the temperature of the room 14 approaches the set temperature and both the heat load amount ΔTl and the temperature unbalance ΔTa become smaller than the reference value, the blowing direction is a horizontal blowing to the ceiling, and the blowing direction is along the ceiling surface. Generate a flow. The blown air flows along the ceiling surface, so the wind speed does not decrease easily.
After reaching the upper ends of the floors 5,16, they flow downward along the side walls 15,16, pass through the floor surface 17, and are sucked into the suction port 10 of the indoor unit 1. As a result, a large circulation is generated in the chamber 14 along the wall surface. That is, when the temperature of the room 14 reaches a substantially stable temperature, the blowout is set near the ceiling outside the living area, and the living area is temperature-controlled from the outer shell. Therefore, strong wind does not reach the living area, and discomfort caused by the wind is eliminated. In addition, since the flow is along the wall, the air flow is hard to be decelerated and the circulation is reliably performed, so that a more uniform temperature distribution in the room can be achieved.

Especially during heating, high temperature air tends to stay near the ceiling 4, but the space above the head was wasted. Such high-temperature air is blown out by a horizontal blowout flow and selected into the living area, which enables efficient heating.

Further, when an obstacle such as a library is installed near the side wall 15, the above-mentioned circulation is less likely to occur, and the temperature near the floor 17 becomes a temperature largely different from the set temperature Tset. That is, the temperature of the floor 17 is detected by the radiant temperature detecting means and it is determined that the temperature imbalance has become large (step 39), and the air flow is switched to the oblique downward direction, so that the living area can be maintained at a desired temperature.

In this embodiment, the louvers 12a and 12b are driven by the motor 31.
Although a and 31b are used, it is also possible to drive the louvers 12a and 12b by using a shape memory alloy or the like.

EFFECTS OF THE INVENTION As is apparent from the above-described embodiments, the present invention detects the radiant temperature near the floor surface and the heat load amount calculating means for calculating the heat load amount in the room by the intake air temperature detecting means and the set temperature detecting means. The radiation temperature detecting means detects the ambient temperature in the vicinity of the radiation temperature detecting means together with the surface temperature of the floor surface or the desk, and detects the temperature imbalance from both of them. When both of the heat load amount and the temperature imbalance are smaller than the preset values, the blowing angle switching means controls the blowing to be substantially horizontal to the ceiling surface. When it is large, the air is controlled to blow out diagonally.Therefore, if the difference between the room temperature and the set temperature is large, or if there is a large imbalance between the floor surface and the room, such as in the initial stage of operation start, the temperature-controlled air is Send it to the living area and let it reach the desired temperature quickly. When the operation is stable, the temperature approaches the set temperature, and the rate of change in the blown air temperature becomes small, a horizontal blowout flow is generated in the non-residential area, and a large convection in the entire room along the ceiling surface is generated.

For this reason, since the blowout airflow does not directly hit the person in the living area, the discomfort caused by the airflow does not occur. In addition, since the airflow flows along the ceiling surface, the wind speed is less likely to decrease, the circulation of the entire frame of the room becomes more reliable, and the indoor temperature distribution is significantly improved.

Further, since the temperature of the ceiling surface and the side wall is controlled at the same time, discomfort caused by cold and warm radiation from these surfaces is reduced.

In particular, when heating, high-temperature air tends to collect near the ceiling, but horizontal blowing allows the high-temperature air in the upper part to be carried into the living area, enabling more efficient heating.

Also, if there are obstacles such as a library or a fluorescent lamp near the side walls or the ceiling, it is difficult to circulate.
It becomes difficult to control the temperature near the floor at the bottom of the residential area, and the temperature of the floor becomes a temperature that is far from the set value, but in this case, the temperature imbalance becomes large, so the horizontal blowing state should be changed to the lower blowing state. To control the living area to the desired temperature.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention, FIGS. 2 and 3 are enlarged views of a main part of the present embodiment, and FIG. 4 is a flow chart diagram showing an example of a program for determining an outlet angle, FIG. 5 is a diagram showing the indoor air flow during the start-up operation, FIG. 6 is a diagram showing the indoor air flow during the stable operation (horizontal blowout), FIG. 7 is a bottom view of the conventional air conditioner, and FIG. FIG. 9 is a central sectional view of the air conditioner, and FIG. 9 is a view showing an indoor air flow in a conventional example. 18 ... Indoor temperature setting means, 19 ... Blow-out air temperature detecting means, 20 ... Radiation temperature detecting means, 24 ... Ambient temperature detecting means, 25 ... Control device, 26 ... Heat load amount calculating means, 27 ... …
Temperature imbalance detection means 28 ... Blowout angle determination means, 29a, 29b ... Blowout angle switching means.

Claims (1)

(57) [Claims] 1. A room, a floor surface, etc. by the radiation temperature output from the radiation temperature detecting means for detecting the radiation temperature of the floor in the living area and the ambient temperature output from the ambient temperature detecting means provided in the vicinity of the radiation temperature detecting means. Temperature unbalance detecting means for detecting the temperature unbalance, indoor heat load calculating means for calculating the indoor heat load based on both outputs of the set temperature detecting means and the intake air temperature detecting means, and the temperature unbalance A blowing angle switching means for arbitrarily changing the blowing angle based on the output signals of both the detecting means and the indoor heat load calculating means, and a small heat load quantity in the room, which is the output from the heat load calculating means, and a temperature imbalance. The blow-out angle is controlled so that the blow-out angle is substantially horizontal to the ceiling surface only when the unbalance amount, which is the output signal from the detection means, is small, and the blow-off angle is controlled to be blown diagonally downward otherwise Ceiling embedded air conditioner which is characterized in that a control means.