JP5293590B2 - Air conditioner for vehicles - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner for a vehicle, which secures each air passage of hot air and cold air and improves temperature controllability of air-conditioned air adjusted in temperature by mixing hot air and cold air. <P>SOLUTION: In this air conditioner 1, an open state in which cold air can be passed in a cold air passing hole 20 is shifted from a close state in which a plurality of opening parts 21 to 23 are closed by an air mix door 8 to a full open state in which all the plurality of opening parts 21 to 23 are started to be opened via a partial open state in which at least one opening part of the plurality of opening parts 21 to 23 is started to be opened. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a vehicle air conditioner that mixes cold air and warm air in an air conditioning case to blow air conditioned into a vehicle interior.

  As such a conventional vehicle air conditioner, for example, an apparatus described in Patent Document 1 is known. The apparatus described in Patent Document 1 promotes mixing of cold air and hot air at a portion where a cold air passage 6 provided downstream of the evaporator 4 and a hot air passage 10 provided downstream of the heater core 4 intersect. A baffle plate 11 is provided. A defrost outlet 13, a vent outlet 14, and a foot outlet 15 are formed in the air conditioning case 2 downstream of the baffle plate 11, respectively.

  The baffle plate 11 is arranged alternately with a number of cold air passage holes 20 penetrating in the direction from the cold air passage 6 toward the vent outlet 14 and sandwiches the cold air passage holes 20 to form a passage along the surface of the plate. And a large number of hot air guide grooves 21.

  Each of the cold air passage holes 20 provided in the baffle plate 11 is divided into two cold air passage holes 20 a and 20 b by a first guide 22 at the central portion in the vertical direction of the baffle plate 11. And the cold wind which forms the flow which penetrates a plate is supplied to the cool air passage hole 20b located above. The cold air passage hole 20 a located below has an opening on the hot air passage 10 side, and communicates not only with the cold air passage 6 but also with the hot air passage 10. Accordingly, the cold air passage hole 20a is supplied with the cold air that forms a flow passing through the baffle plate 11 and the hot air flowing in from the hot air passage 10 side.

  Further, warm air from the warm air passage 10 side flows upward in a passage along the surface of the plate formed by the warm air guide groove 21. Accordingly, the hot air is guided from the hot air passage 10 through the passage formed by the hot air guide groove 21 toward the defrost outlet 13 and also flows out in the direction of the vent outlet 14 in a layered manner. The temperature is adjusted by mixing with layered cold air passing through the through-hole 20 (see FIGS. 1 and 4 described in Patent Document 1).

JP 2004-237940 A

  In the above prior art, by forming the passage along the plate formed by the hot air guide groove 21, the temperature drop of the air blown out from the defrost outlet 13 is suppressed. There is a problem that the area of the cool air passage is reduced and a sufficient amount of cool air cannot be obtained. For this reason, although the amount of warm air can be ensured, the amount of cold air during maximum cooling is reduced. Furthermore, in a vehicle air conditioner, when using air conditioning air conditioning by mixing cold air and hot air, ensure that the air volume of both the hot air and cold air is well balanced, High temperature controllability is required.

  Therefore, the present invention has been made in view of the above-described problems, and its purpose is to secure the ventilation path of hot air and cold air, and to adjust the temperature of the conditioned air whose temperature is adjusted by mixing hot air and cold air. An object of the present invention is to provide a vehicle air conditioner that improves controllability.

In order to achieve the above object, the following technical means are adopted. That is, the invention described in claim 1 includes an air conditioning case (2) having a passage through which air flowing toward the passenger compartment flows, a cold air passage (6) through which cool air in the air conditioning case flows, and hot air in the air conditioning case. The air mix door (8) that adjusts the mixing air volume ratio that mixes the warm air passage (7) through which the air flows, the cold air that has flowed through the cold air passage, and the hot air that has flowed through the hot air passage, and the air mix door In a vehicle air conditioner that includes a mixing unit (9) in an air conditioning case in which cold air and hot air in which the air volume ratio is adjusted is mixed, and that blows conditioned air that is temperature-controlled in the mixing unit into the vehicle interior,
A plurality of openings (21, 22, 23) formed in the air conditioning case so as to pass when the cold air flows out from the cold air passage to the mixing unit, and the cold air can pass through the operation of the air mix door A cold air passage hole (20) in which the open area of the part is variable, and a guide part (15) extending from the edge part of the opening part to the mixing part,
The open state in which the cool air can pass through the cold air passage hole is a part in which at least one of the plurality of openings starts to be opened from the closed state in which the plurality of openings are closed by the air mix door. Via the open state , configured to transition to the fully open state where all of the plurality of openings begin to open ,
At least one opening that starts to be opened in the partially opened state is formed to have an enlarged opening portion (21a) that protrudes in the direction in which the air mix door operates toward the closed state, compared to the remaining openings. It is characterized by being.

  According to this invention, since the outflow of the cold air to the mixing portion is blocked in the closed state, the high-temperature conditioned air is blown into the passenger compartment as the heating air, and in the partially open state, the plurality of openings Since the cool air flows out only from some of the openings, the air volume of the cool air is limited, so that the temperature drop of the conditioned air due to the increase in the amount of the cool air mixed into the mixing section can be suppressed. Therefore, when controlling the air conditioning to a relatively high temperature near the maximum heating, it is possible to create a state in which the air conditioning temperature does not change suddenly due to the restriction of the amount of cold air. Can be improved. Furthermore, in the closed state, since the guide part supports the progress of the hot air from the hot air passage, the resistance to the hot air can be reduced and high maximum heating performance can be exhibited. In the fully open state, all the openings constituting the cold air passage hole are opened and the open area through which the cold air passes increases, so that the resistance of the cold air mixed with the hot air is reduced, and the desired air mixing property or Cooling performance can be obtained. Therefore, it is possible to provide a vehicle air conditioner that secures ventilation paths for hot air and cold air and improves the temperature controllability of the conditioned air.

Further , according to the present invention, the opening that starts to be opened in the partially opened state includes the enlarged opening portion, so that the enlarged opening portion can be opened first in the partially opened state. For this reason, by adjusting the size and shape of the enlarged opening portion, it is possible to appropriately adjust the air volume and flow velocity of the cold air mixed with the hot air in the mixing portion in the partially opened state, and air mixing is performed. Appropriate control of the blown air temperature can be performed, and the control can be easily performed.

According to a second aspect of the present invention, the enlarged opening portion is formed above the opening. According to the present invention, the cold air flowing out from the upper part of the cold air passage hole in the partially opened state is mixed with the warm air in the mixing unit. Thereby, since it is colder than warm air, heavier cool air flows out from the upper part to the mixing part, so that the elasticity in the mixing part is improved and it is possible to contribute to the improvement of the temperature controllability of the blown air.

According to a third aspect of the invention, each opening has an elongated shape whose longitudinal direction coincides with the direction in which the enlarged opening portion projects. According to the present invention, since the enlarged opening portion is easily formed in the opening portion, it is easy to realize a structure that contributes to the formation of an opening for achieving a partially open state. Therefore, the structure for realizing the partially open state can be simplified, and the air flow ventilation resistance can be reduced.

According to the fourth aspect of the present invention, the width of the guide portion extending toward the mixing portion is smaller on the side closer to the defroster outlet (10) formed in the air conditioning case than on the far side. According to this invention, since the guide portion has a short protruding width on the side close to the defroster outlet, the air mixing property between the cold air and the warm air is improved on the side near the defroster outlet. Moreover, since the protrusion width | variety of a guide part is longer on the side far from a defroster blower outlet, the progress of cold wind can be improved rather than air mix property. Therefore, it is possible to provide a temperature control improvement for the conditioned air to the defroster outlet and to provide a progress improvement for the conditioned air toward the other outlet (for example, the face outlet) away from the defroster outlet. it can.

  In addition, the code | symbol in the bracket | parenthesis of each said means is an example which shows a corresponding relationship with the specific means of embodiment mentioned later.

It is sectional drawing which showed the internal structure of the air-conditioning case which concerns on the vehicle air conditioner of 1st Embodiment. It is a perspective view which shows a structure when an air mix door, a cold air passage hole, etc. are seen from the face blower outlet side (downstream side). It is a figure which shows a structure when an air mix door, a cold air passage, etc. are seen from an evaporator side (upstream side), and the air conditioning of the right side passage is set at the time of maximum heating toward the vehicle front, and the left side passage toward the vehicle front This shows a state where the air conditioning is set at the maximum cooling time. FIG. 4 is a diagram showing a structure similar to that of FIG. 3, except that the right-side passage shows a partially opened state in which a part of the opening begins to open toward the front of the vehicle. FIG. 5 is a diagram showing the same structure as in FIGS. 3 and 4 except that air conditioning in the right passage and air conditioning in the left passage are set at the maximum cooling toward the front of the vehicle. It is a schematic diagram when the closed state in which all the openings (cold air passage holes) are closed is viewed from the evaporator side (upstream side). It is a schematic diagram when the partial open state where one opening part begins to open is seen from the evaporator side (upstream side). It is a schematic diagram when seeing from the evaporator side (upstream side) the fully open state from which all the openings begin to open. It is a graph which shows the relationship between the warm air ratio and the blowing temperature in the blowing wind accompanying the opening degree adjustment of an air mix door, and has shown the effect by adjusting the temperature of the blowing wind through a partly open state. It is a schematic diagram when a partially open state is seen from the evaporator side (upstream side) about the 1st modification of a cold air passage hole. It is a schematic diagram when a partially open state is seen from the evaporator side (upstream side) about the 2nd modification of a cold air passage hole. It is a schematic diagram when a partially open state is seen from the evaporator side (upstream side) about the 3rd modification of a cold air passage hole. In the vehicle air conditioner of 2nd Embodiment, it is a schematic diagram when the closed state where all the opening parts are closed is seen from the evaporator side (upstream side). It is a schematic diagram when the partially open state which shifted from the closed state shown in FIG. 13 is seen from the evaporator side (upstream side).

  A plurality of modes for carrying out the present invention will be described below with reference to the drawings. In each embodiment, parts corresponding to the matters described in the preceding embodiment may be denoted by the same reference numerals, and redundant description may be omitted. When only a part of the configuration is described in each mode, the other modes described above can be applied to the other parts of the configuration. Not only combinations of parts that clearly show that combinations are possible in each embodiment, but also combinations of the embodiments even if they are not explicitly stated unless there is a problem with the combination. Is also possible.

(First embodiment)
A vehicle air conditioner according to a first embodiment will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing an internal configuration of an air conditioning case 2 according to the vehicle air conditioner 1 of the first embodiment. In FIG. 1, the upper side of the page indicates the upper side of the vehicle, the lower side indicates the lower side of the vehicle, the left direction indicates the front side of the vehicle, and the right direction indicates the rear side of the vehicle. Moreover, in FIG. 1, the arrow described in the air-conditioning case 2 has shown the flow direction of air. FIG. 2 is a perspective view showing the structure when the air mix door 8, the cold air passage hole 20 and the like are viewed from the face outlet 11 side (downstream side). In FIG. 2, the upper side of the page is the vehicle direction, the lower side is the lower side of the vehicle, the right side is the right side toward the front of the vehicle, and the left side is the left side toward the front of the vehicle.

  The air conditioning unit that constitutes the vehicle air conditioner 1 of the present embodiment has an outer shell formed of an air conditioning case 2 and roughly includes a blower unit and an air conditioning unit. The air conditioning unit is disposed on the back side of the instrument panel in front of the vehicle interior. The air conditioning case 2 is formed of a plurality of case members that are resin molded products such as polypropylene. The plurality of case members are integrally coupled by fastening means such as metal springs and screws to form the air conditioning case 2.

  The blower unit includes a blower (not shown) for blowing air inside or outside the vehicle compartment to the air conditioning unit, and the blower outlet of the blower is connected to the blower passage 3 leading to the inlet of the air conditioning unit. For example, the blower is composed of a centrifugal multiblade fan and a motor that drives the fan. The centrifugal multiblade fan is surrounded by a scroll casing and communicated with the air passage 3 by a duct extending in the centrifugal direction of the centrifugal multiblade fan. Yes.

  The air-conditioning unit includes an evaporator 4 provided by horizontally closing the entire air passage 3, a heater core 5 for heating the air passing through the evaporator 4, a cold air passage 6, a hot air passage 7, an air mix door 8, a mixing A portion 9, an auxiliary heater 14, a cold air passage hole 20, and a guide portion 15 are provided inside the air conditioning case 2. Further, the air conditioning case 2 is formed with a plurality of air outlets on the downstream side of the cold air passage 6 and the hot air passage 7, and in this embodiment, the defroster air outlet 10, the face air outlet 11, the foot air outlet 12, And a rear seat outlet 13 is provided. The interior of the air conditioning case 2 is configured symmetrically by a passage partition wall that bisects the vehicle in the left-right direction, and the vehicle air conditioner 1 can supply conditioned air to both the left and right sides of the driver's seat and the passenger's seat of the vehicle. is there.

  The defroster outlet 10 is located, for example, in the upper part of the air conditioning case 2 on the front side of the vehicle, and blows out conditioned air along the side of the vehicle interior such as the front window glass to reduce the degree of fogging of the front window glass. It is an opening. The face outlet 11 is, for example, an opening that is located on the vehicle rear side of the defroster outlet 10 at the top of the air conditioning case 2 and that blows conditioned air toward the upper body of the occupant, and is mainly used during cooling. . The foot outlet 12 is, for example, an opening for blowing the conditioned air to the feet of the occupant located below the defroster outlet 10 and the face outlet 11 on the vehicle rear side of the air conditioning case 2. Sometimes used. The rear seat outlet 13 is, for example, an opening for blowing conditioned air toward the rear seat occupant located in the lower portion of the air conditioning case 2 on the vehicle rear side. You may comprise so that the open area of each blower outlet may be controlled by a door.

  In addition, at least one outlet is disposed on each of the left and right sides of the vehicle, and is arranged so that air-conditioned air can be blown to predetermined portions on both the left and right sides of the driver's seat and the passenger's seat. The operations of the blower, the air mix door 8, various doors and the like are controlled by an air conditioner control device.

  The evaporator 4 is, for example, a cooling heat exchanger that is positioned on the vehicle front side of the air conditioning case 2 and that evaporates the low-temperature and low-pressure refrigerant decompressed by the expansion valve in the refrigeration cycle by receiving air from the blower. . And the blowing air which passes the circumference | surroundings of the tube through which a refrigerant | coolant flows is cooled, and cold wind is supplied to the downstream cold wind path 6. FIG.

  The heater core 5 is a heating heat exchanger that is located on the vehicle rear side of the evaporator 4 and heat-exchanges air with the high-temperature cooling water of the traveling engine as a heat source, and heats the blown air flowing around. It arrange | positions so that the channel | path of the downstream of the air flow direction rather than the container 4 may be partially plugged up. An auxiliary heater 14 is further provided downstream of the heater core 5 and behind the vehicle to replenish the heating capacity by heating warm air. The warm air reheated by the auxiliary heater 14 is mainly supplied to the foot outlet 12.

  The mixing unit 9 is a space provided in the air conditioning case 2 where the cold air flowing from the evaporator 4 and the warm air heated by the heater core 5 are mixed. In addition, the conditioned air whose temperature is adjusted in this space can be supplied to the passenger compartment at an appropriate air volume ratio by controlling the open area of each outlet.

  A plurality of the cold air passage holes 20 are formed in the air conditioning case 2 so as to pass when the cold air flows out from the cold air passage 6 to the mixing unit 9 as an air mix chamber. And the third opening 23. As shown in FIG. 2, the cold air passage hole 20 of the first embodiment includes a second opening 22, a first opening 21, and a third opening 23 that are arranged in order from the right side toward the front of the vehicle.

  As shown in FIG. 2, the first opening portion 21 of the cold air passage hole 20 operates toward the closed state in which the air mix door 8 closes the cold air passage hole 20 as compared with the other opening portions 22 and 23. It is formed so as to have an enlarged opening portion 21a protruding in the direction (or the defroster outlet 10 side, the sliding closing direction of the air mix door 8). That is, the 1st opening part 21 is largely opened by the side of the defroster blower outlet 10 by the part of the enlarged opening part 21a compared with the other opening parts 22 and 23. FIG. When the air mix door 8 is slid in the direction of opening the cold air passage hole 20 from the closed state, the enlarged opening portion 21a of the first opening portion 21 is first opened, and then the second The opening 22 and the third opening 23 begin to open.

  Two sets of such cold air passage holes 20 are arranged in the left-right direction of the vehicle inside the air conditioning case 2. The open area in the cold air passage hole 20 through which the cold air can pass is variable according to the sliding operation of the air mix door 8. Further, the open area of the two cold air passage holes 20 arranged in the left-right direction of the vehicle can be varied independently by the air mix door 8 corresponding to each cold air passage hole 20.

  Each cold air passage hole 20 is provided with a guide portion 15 extending from the edge portion toward the mixing portion 9. The guide portion 15 is provided for each of the openings 21, 22, and 23 and has a shape extending toward the defroster outlet 10 along a virtual straight line connecting the lower hot air passage 7 and the defroster outlet 10. is there. As a result, the guide unit 15 guides the warm air from the warm air passage 7 toward the defroster outlet 10. Further, the guide portion 15 has a longer protruding length from the edge portion as it goes downward.

  Further, the guide portion 15 is provided with a bridging piece 30 that bridges between the adjacent guide portions 15. The bridging piece 30 has a predetermined width extending in the cold air passage direction, and serves as a reinforcement for the guide portion 15, and in combination with the shape of the guide portion 15 extending toward the mixing portion 9, the cold air passage hole 20 is formed. This contributes to an improvement in smooth fluidity when the passing cold air flows toward the face outlet 11.

  The air mix door 8 is a door that is located on the vehicle rear side of the evaporator 4 and that can open and close the cold air passage 6 and the hot air passage 7 that are downstream passages through which the air passing through the evaporator 4 flows down. The air mix door 8 mixes the cold air flowing through the cold air passage 6 and the hot air flowing through the hot air passage 7 by adjusting the open area of the cold air passage hole 20 and the passage area to the heater core 5. The air volume ratio can be adjusted.

  The air mix door 8 is a sliding door that is slid by a drive device such as a servo motor and moves to the cold air passage 6 side and the hot air passage 7 side. The air mix door 8 includes a door main body, a rack (door slide gear) provided at an end of the door main body, a pinion (shaft gear) rotated by a driving device, a door guide pin, and the like. The rack is formed so as to extend in the entire moving direction of the door body, and is configured to mesh with a pinion provided on the shaft. The pinion is further rotated together with the gear by a rotational driving force of a servo motor or the like transmitted to a gear provided outward in the axial direction, and this rotational driving force is transmitted as a force for moving the rack in a direction perpendicular to the axial direction of the shaft. The door body will move. In this way, the air mix door 8 adjusts the mixing ratio at which the mixing unit 9 mixes the amount of warm air that passes through the heater core 5 and the amount of cool air that does not pass through the heater core 5 depending on the slide position.

  When the air mix door 8 is at a position on the heater core 5 side as in the right side passage (the left side passage toward the front of the vehicle) in FIG. 3, it is during maximum cooling, and the upper entrance passage of the heater core 5 is closed to close the heater core. The air flow to 5 is completely cut off, and cooling air is provided to the passenger compartment. Conversely, when the air mix door 8 is at the upper position as in the left passage (right passage toward the front of the vehicle) in FIG. 3, it is during maximum heating, and the cool air passage 6 is closed and the evaporator 4 is closed. All the air that has passed passes through the heater core 5 and is heated to provide heating air in the passenger compartment.

  Further, when the air mix door 8 is in the middle position between the maximum cooling and the maximum heating, both the cold air passage 6 and the hot air passage 7 are partially opened so that both the cold air and the hot air flow down. Then, the mixture is mixed and temperature-controlled in the mixing section 9 provided on the upstream side of each outlet, and then passed through the opened outlet and sent to the vehicle interior. The air mix door 8 adjusts the air volume ratio of the cold air and the hot air according to the slide position, and adjusts the temperature of the conditioned air. The slide position of the air mix door 8 is determined by the air conditioner control device together with the blowing mode according to the set temperature of the automatic air conditioner, and is determined by the air conditioner control device according to the set temperature and the blowing mode in the case of a manual air conditioner. Is done.

  The warm air passage 7 provided on the downstream side of the heater core 5 is formed to extend upward from the lower portion of the air conditioning case 2 in a form inclined to the front side of the vehicle. The warm air passage 7 has a width dimension over the entire vehicle left-right direction of the air conditioning case 2, and the width dimension is larger than the dimension in the vehicle front-rear direction. That is, the warm air passage 7 is a flat passage that is thin in the front-rear direction, horizontally long, and long in the up-down direction. The warm air flowing through the warm air passage 7 advances toward the cold air passage 20 and forms a flow that reaches the defroster outlet 10. Furthermore, the warm air that has passed through the heater core 5 also forms a flow that travels rearward of the vehicle and reaches the foot outlet 12 and the rear seat outlet 13. In addition, when supplying cool air to the rear seat outlet 13, the air passing through the heater core 5 is blocked by the air mix door 8 so that the cool air passing through the evaporator 4 does not pass through the hot air passage 7. A flow that wraps around the lower part in the air conditioning case 2 is formed.

  Next, each state in which the open area of the cold air passage hole 20 changes by sliding the air mix door 8 will be described. 3, 4, and 5 are diagrams illustrating the structure when the air mix door 8, the cold air passage hole 20, and the like are viewed from the evaporator 4 side (upstream side). As shown in FIG. 3, the right side passage (the left side passage in FIG. 3) toward the front of the vehicle is in a closed state in which the cold air passage hole 20 is closed by the air mix door 8, and the air conditioning of this passage is set during maximum heating. ing. On the other hand, the left passage (right passage in FIG. 3) toward the front of the vehicle is in a state where the cold air passage hole 20 is fully opened by the air mix door 8, and air conditioning of this passage is set at the maximum cooling time.

  Further, FIG. 4 shows a part of the opening of the cool air passage hole 20 as the air mix door 8 slides downward from the state of FIG. 3 in the right passage (left passage in FIG. 3) toward the front of the vehicle. It has shifted to the partially open state where only the first opening 21 starts to be opened. When the air mix door 8 further slides downward, as shown in FIG. 5, the second opening 22 and the third opening 23 of the right passage (left passage in FIG. 3) start to open toward the front of the vehicle. After being fully opened, the open area of the cold air passage hole 20 is further increased, and finally the cold air passage hole 20 is fully opened, and the air conditioning of this passage is set at the maximum cooling time. As described above, in the left-side passage shown in FIGS. 3 to 5, the open area of the cold air passage hole 20 is in a closed state in which maximum heating is performed, in a partially open state (a state in which some openings begin to be opened), The state is shown in which the state transitions to the fully open state, which is the maximum cooling time, in order through the fully open state (a state in which all the openings begin to be opened).

  The transition of the open state in which the cool air can pass in the cool air passage hole 20 including the plurality of openings 21, 22, 23 will be further described with reference to FIGS. 6 to 8, the right side of the page is the left side toward the front of the vehicle, the left side of the page is the right side toward the front of the vehicle, the front side that is perpendicular to the page is the front of the vehicle, and the upper side of the page is the slide of the air mix door 8 The closing direction and the lower side of the drawing indicate the sliding opening direction, respectively.

  FIG. 6 is a schematic diagram when the closed state in which all the openings 21, 22, and 23 are closed is viewed from the evaporator 4 side (upstream side). In this closed state, since all the air that has passed through the evaporator 4 passes through the heater core 5, maximum heating air-conditioning that can exhibit the maximum heating capacity is performed. For example, when heating air is supplied to the defroster outlet 10 or the foot outlet 12 by reducing the air conditioning temperature from the maximum heating air conditioning, a small amount of cold air is mixed with the warm air by the mixing unit 9. Then, the cold air passage hole 20 is slightly opened, and the air mix door 8 is slid in a partially opened state.

  FIG. 7 is a schematic view when a partially opened state in which the first opening 21 starts to be opened among the plurality of openings is viewed from the evaporator 4 side (upstream side). In the partially opened state, only the enlarged opening portion 21 a of the first opening 21 is opened, and the other openings are all closed by the air mix door 8. That is, since the cold air flows out from only the enlarged opening portion 21a of the first opening 21 to the mixing unit 9, through a state in which the cold air is supplied from only some of the plurality of openings, First, a state where a small amount of cold air is mixed with a large amount of hot air can be created. Thereby, compared with the blowing temperature at the time of maximum heating, the blowing air accompanied by a slight temperature fall can be supplied. Therefore, the combination of the cold air passage hole 20 and the air mix door 8 makes it possible to reduce the excessive temperature drop and to improve the temperature controllability when performing air conditioning that increases the cold air ratio from the time of maximum heating. Can be provided. This partially open state continues while the air mix door 8 moves in the slide opening direction by the length in the sliding direction (projecting dimension) of the enlarged opening portion 21a. That is, the length of the partially opened state can be set by adjusting the length in the sliding direction of the enlarged opening portion 21a.

  Furthermore, when supplying the heating air with the air conditioning temperature lowered, in order to mix more cold air with the warm air in the mixing unit 9, not only the first opening 21 but also other openings are opened. The air mix door 8 is slid to the fully open state where the cold air passage hole 20 is further opened. FIG. 8 is a schematic diagram when the fully open state in which all the openings 21, 22, and 23 start to be opened is viewed from the evaporator 4 side (upstream side). In the fully open state, the second opening 22 and the third opening 23 which are the remaining openings are opened after the first opening 21. That is, since the cold air flows out from all the openings 21, 22, 23 to the mixing unit 9, the ratio of the cold air to the warm air increases. Further, in the fully open state, compared with the partially open state, the cold air flows out from the wide range in the left-right direction of the vehicle and mixes with the warm air, so that the temperature adjustment is performed so that the blowing temperature further decreases. As described above, in the fully open state, the blown air with a relatively large temperature drop is supplied as compared with the blown temperature at the time of maximum heating.

  The effect obtained by adjusting the temperature of the blown air through the partially opened state from the time of maximum heating will be described with reference to FIG. FIG. 9 is a graph showing the relationship between the warm air ratio of the blown air and the blown temperature, which is associated with the opening adjustment of the air mix door 8. The alternate long and short dash line in the figure shows the relationship between the warm air ratio of the blown air and the air temperature of the defroster blow in the conventional vehicle air conditioner. On the other hand, the two-dot chain line shows a linear line that represents the relationship between the hot air ratio of the blown air and the blown temperature by a linear expression. Since the temperature of the blown-out air is easier to control as the relationship approximates to this linear line, favorable temperature controllability can be obtained in both the manual mode and the auto mode of the air conditioner.

  Therefore, according to the vehicle air conditioner 1 of the present embodiment, the vehicle air conditioner 1 is configured to reduce the warm air ratio of the blown air through the partially opened state from the time of maximum heating, and thus is represented by a solid line in FIG. Temperature controllability can be obtained. In other words, in the foot blowing mode and the defroster blowing mode, when performing the control to increase the cool air ratio of the blown air and reduce the temperature of the blown air from the maximum heating time, the conventional defroster blowing represented by the one-dot chain line The temperature drop in the range where the hot air ratio is high with respect to the air temperature can be suppressed very small. As a result, in air conditioning control in a region where the heating capacity is high, rapid temperature change due to mixing of cold air as seen in conventional defroster blowout can be suppressed, and high temperature control approaching a linear line shown by a two-dot chain line Can be realized.

  The cold air passage hole 20 may have other forms (first modification, second modification, and third modification) as described below. FIG. 10 is a schematic view of the cold air passage hole 20A, which is the first modified example, when the partially opened state is viewed from the evaporator 4 side (upstream side). As shown in FIG. 10, the cold air passage hole 20 </ b> A has a sliding operation direction of the air mix door 8 in each of the first opening 21 </ b> A, the second opening 22 </ b> A, and the third opening 23 </ b> A with respect to the cold air passage 20. A tapered opening portion is formed at an end portion which starts to be opened first (in the vertical direction in FIG. 10). Thereby, the enlarged opening portion 21a of the first opening 21A is also a tapered opening.

  FIG. 11 is a schematic diagram of a partially open state of the cold air passage 20 </ b> B that is the second modification when viewed from the evaporator 4 side (upstream side). As shown in FIG. 11, the cold air passage hole 20 </ b> B has the same shape and relation as the openings 21, 22, and 23 with respect to the cold air passage hole 20, the first opening 21 </ b> A, the second opening 22 </ b> A, and the third. In addition to the opening 23A, a fourth opening 24 and a fifth opening 25 that are further recessed in the sliding opening direction of the air mix door 8 are provided as compared with the openings 22A and 23A. That is, the central first opening 21B has an opening shape that protrudes most in the sliding closing direction, and then the second opening 22A and the third opening 23A protrude, and the fourth opening 24 and the fifth opening. The opening 25 is the opening that retreats most in the sliding opening direction. As a result, when the air mix door 8 moves from the closed state to the slide opening direction, the first opening portion 21B is first opened partially and then the second opening portion 22A and the third opening portion 23A. Starts to open, and finally, the fourth opening 24 and the fifth opening 25 start to open and all transition to the open state.

  FIG. 12 is a schematic diagram of a partially opened state of the cold air through hole 20C as the third modification when viewed from the evaporator 4 side (upstream side). As shown in FIG. 12, the cold air passage hole 20 </ b> C includes two first openings 21 </ b> C on both sides in the vehicle left-right direction with respect to the cold air passage hole 20. It is configured with two openings 22C. That is, the two first openings 21C located at both ends have the opening shape protruding most in the slide closing direction, and the remaining one second opening 22C is the opening retreating most in the slide opening direction. . As a result, when the air mix door 8 moves from the closed state in the sliding opening direction, first, the enlarged opening portions 21a of the first opening portions 21C located at both ends start to open partially, and then the second opening state. All the openings 22C start to open and transition to the open state.

  The effect which the vehicle air conditioner 1 of this embodiment brings is described below. The vehicle air conditioner 1 includes a plurality of openings 21, 22, and 23 formed in the air conditioning case 2 so as to pass when the cold air flows from the cold air passage 6 to the mixing unit 9. A cold air passage hole 20 in which the open area through which the cold air can pass is variable by the operation of the above, and a guide portion 15 extending from the edge of the openings 21, 22, 23 constituting the cold air passage hole 20 toward the mixing portion 9. Prepare. The open state in which the cool air can pass through the cold air passage hole 20 is from a closed state in which the plurality of openings 21, 22 and 23 are closed by the air mix door 8, and from among the plurality of openings 21, 22 and 23. After a partially opened state in which at least one opening (for example, the first opening 21) starts to be opened, a transition is made to a fully opened state in which all of the plurality of openings 21, 22, and 23 start to be opened.

  According to this configuration, since the outflow of the cold air to the mixing unit 9 is blocked in the closed state, the high-temperature conditioned air is blown into the vehicle interior as the heating air, and in the partially opened state, the plurality of openings Since the cool air flows out only from a part of the openings (for example, the first opening 21) among 21 to 23, it is possible to realize an air mix in which the amount of the cool air flowing out to the mixing unit 9 is limited to a small amount. For this reason, the temperature fall of the air-conditioning wind which arises by the mixing amount increase of the cold wind to the mixing part 9 can be suppressed. Therefore, when providing relatively high-temperature air conditioning near the maximum heating time, it is possible to create a state in which the air-conditioning temperature does not change abruptly due to the restriction of the amount of cold air. can do. Furthermore, in the closed state, the effect of rectifying the flow is obtained by the guide portion 15 and the straight-forward force of the warm air from the warm air passage 7 is helped, so the resistance to warm air is reduced and high maximum heating performance is exhibited. be able to. In the fully open state, all the openings 21 to 23 constituting the cold air passage hole 20 are opened to increase the open area through which the cold air passes, so that the passage resistance of the cold air mixed with the hot air is reduced, and the desired air Mixability or cooling performance can be obtained. Therefore, it is possible to provide a vehicle air conditioner that secures ventilation paths for hot air and cold air and improves the temperature controllability of the conditioned air.

  Further, by arranging the defroster outlet 10 on the extension connecting the hot air passage 7 and the guide portion 15, the temperature controllability is improved particularly in the defroster blowing mode, and the heating capacity and the window fogging performance are ensured appropriately. The passenger comfort can be improved by realizing proper temperature control.

  In addition, at least one opening (for example, the first opening 21) that starts to be opened in the partially opened state is larger than the remaining openings so as to protrude in the direction in which the air mix door 8 operates toward the closed state. An opening portion 21a is formed. According to this structure, the opening part 21a is provided in the 1st opening part 21 which begins to open | release in a partially open state, Therefore The some opening parts 21-23 are the edge parts of the slide closing direction of the air mix door 8. A step structure in which only the first opening 21 protrudes is formed. Thereby, the enlarged opening part 21a can be first opened in a partially opened state. For this reason, when providing the conditioned air which shifts to the cooling side from the maximum heating time, it is possible to provide a simplified structure for restricting the amount of the cold air and preventing a sudden temperature drop of the blown air.

  Further, by adjusting the size and shape of the enlarged opening portion 21a, it is possible to appropriately adjust the air volume and flow velocity of the cold air mixed with the hot air in the mixing unit 9 in the partially opened state, and air mixing is performed. Appropriate control of the blown air temperature can be performed, and such temperature control can be easily and satisfactorily performed.

  Further, the enlarged opening portion 21a is formed at the upper portion of the first opening portion 21, so that the cold air flowing out from the upper portion of the cold air passage hole 20 in the partially opened state is mixed with the hot air at the mixing portion 9. . Thereby, since it is colder than warm air, heavier cool air flows out from the upper part to the mixing unit 9, so that the elamix property in the mixing unit 9 becomes good and contributes to the improvement of the temperature controllability of the blown air. Further, the enlarged opening portion 21 a formed at the upper part of the first opening portion 21 contributes to a marked improvement in the temperature controllability of the conditioned air flowing upward.

  Moreover, each opening part 21-23 is formed in the elongate shape in which the longitudinal direction corresponds with the direction where the enlarged opening part 21a protrudes. According to this configuration, since the enlarged opening portion 21a is easily formed in the first opening portion 21, it is easy to form a structure that contributes to the open state of the first opening portion 21 that achieves a partially open state. Therefore, the structure for realizing the partially open state can be simplified, and the air flow ventilation resistance can be reduced.

  Moreover, the extension width dimension (protrusion length to the mixing part 9 side) toward the mixing part 9 in the guide part 15 is smaller on the side closer to the defroster outlet 10 formed in the air conditioning case 2 than on the far side. Yes. According to this structure, since the guide part 15 has a short protruding length on the side close to the defroster outlet 10, the air mixing property of the cool air and the warm air is improved on the side close to the defroster outlet 10. Moreover, since the protrusion length of the guide part 15 is longer on the side far from the defroster outlet 10, the progress of the cold air can be improved than the air mix property. Therefore, the guide part 15 provides temperature control improvement to the conditioned air to the defroster outlet 10. Moreover, the guide part 15 exhibits the rectification | straightening effect with respect to the air-conditioning wind which leaves | separates from the defroster blower outlet 10 and goes to the face blower outlet 11, for example, and provides smooth fluidity improvement.

(Second Embodiment)
Unlike the first embodiment, the second embodiment is an embodiment provided with a structure for realizing a partially open state on the air mix door 8A instead of the cold air passage hole. Other configurations except this structure are the same as those in the first embodiment, and have the same functions and effects. FIG. 13 is a schematic diagram when the closed state of the cold air passage hole in the second embodiment is viewed from the evaporator 4 side (upstream side). FIG. 14 is a schematic diagram when the partially opened state shifted from the closed state shown in FIG. 13 is viewed from the evaporator 4 side (upstream side).

  As shown in FIGS. 13 and 14, the air mix door 8 </ b> A includes a recessed portion 8 a in which a part of the end portion of the door body in the slide closing direction is recessed toward the slide opening direction. The cold air passage hole 40 is composed of three openings 41, 42, and 43 arranged in the left-right direction of the vehicle. Each of the openings 41 to 43 has a rectangular opening of the same size, and all the openings 41 to 43 are formed. 43 is arranged so that both end positions in the longitudinal direction (sliding direction in the figure) are aligned in the left-right direction of the vehicle. The concave portion 8a formed in the air mix door 8A only needs to be disposed at a position corresponding to at least one of the three openings 41 to 43 in the left-right direction of the vehicle. As an example of this, in FIGS. 13 and 14, the recess 8 a is disposed at a position corresponding to the opening 41 located at the center in the left-right direction of the vehicle.

  With such a configuration, when the air mix door 8A moves in the sliding opening direction from the closed state of FIG. 13, first, the opening 41 starts to open by overlapping with the recess 8a (the state of FIG. 14). Then, when the movement of the air mix door 8A in the slide opening direction further proceeds, the opening portions 42 and 43 are next shifted to the fully opened state. This partially open state continues while the air mix door 8A moves in the slide opening direction by the size of the recess 8a. That is, when it is desired to set the partially opened state to be long, the recess dimension of the recess 8a may be set to be long.

(Other embodiments)
The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  Although the air mix door 8 in the said embodiment has a slide-type plate-shaped door main body, the air mix door which adjusts the open area of the some cold air through-hole 20 is limited to this form. is not. For example, the air mix door may be a rotating door, a door having a plate-like main body, or a door having a film-like main body, and the cold air passage 20 is closed, partially open, or fully open. If it is the structure which can implement | achieve, it will not be limited to the system, shape, and material.

  In the above embodiment, the cold air cooled by the evaporator 4 passes through the cold air passage hole 20 whose opening area is adjusted by the air mix door 8, but the hot air passage hole through which the hot air passes is provided. It is also possible to apply to a technique for adjusting the open area of the. In this case, the cold air flows upward in the air conditioning case and is mixed with the warm air in the mixing unit.

DESCRIPTION OF SYMBOLS 1 ... Vehicle air conditioner 2 ... Air conditioning case 4 ... Evaporator 5 ... Heater core 6 ... Cold air passage 7 ... Hot air passage 8 ... Air mix door 9 ... Mixing part 15 ... Guide part 20 ... Cold air passage 21 ... 1st opening part (Aperture)
21a ... Enlarged opening portion 22 ... Second opening (opening)
23 ... Third opening (opening)

Claims (4)

An air conditioning case (2) having a passage through which air flowing into the passenger compartment flows, a cold air passage (6) through which the cold air in the air conditioning case flows, and a hot air passage (7) through which the warm air in the air conditioning case flows The mixed air volume ratio is adjusted by the air mix door (8) for adjusting the mixed air volume ratio for mixing the cold air flowing through the cold air passage and the hot air flowing through the hot air passage, and the air mix door. A vehicle air conditioner for blowing air conditioned air, the temperature of which is adjusted by the mixing unit, into the vehicle interior, the mixing unit (9) in the air conditioning case in which the cold air and the hot air are mixed.
A plurality of openings (21, 22, 23) are formed in the air conditioning case so as to pass when the cold air flows out from the cold air passage to the mixing portion, and the air mix door operates to A cold air passage hole (20) in which an opening area of the opening through which the cold air can pass is variable;
A guide portion (15) extending from the edge of the opening toward the mixing portion,
The open state in which the cold air can pass through the cold air passage hole is from a closed state in which the plurality of openings are closed by the air mix door, and at least one of the plurality of openings. Through a partially open state where the part begins to be opened, and is configured to transition to a fully open state where all of the plurality of the openings begin to be opened ,
The at least one opening that starts to be opened in the partially opened state has an enlarged opening portion (21a) that protrudes in a direction in which the air mix door operates toward the closed state, compared to the remaining openings. An air conditioner for a vehicle, characterized in that it is formed . The vehicle air conditioner according to claim 1, wherein the enlarged opening portion is formed in an upper portion of the opening . 3. The vehicle air conditioner according to claim 1 , wherein each of the openings has an elongated shape whose longitudinal direction coincides with a direction in which the enlarged opening portion protrudes . The guide portion has a width dimension extending toward the mixing section, the claim 1, characterized in that the side closer to the defroster outlet (10) formed in the air conditioning case is smaller than the side farther The vehicle air conditioner according to any one of claims 3 to 4 .

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