JP2009073370A - Air conditioner for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the acceleration of mixing of cold air and warm air while suppressing the increase of ventilation resistance. <P>SOLUTION: A tunnel-like door-side guide member 21 extending perpendicularly to a rotary shaft 19a along a blocking surface 19d is disposed on the blocking surface 19d which is one of both plate surfaces of a plate door section 19b of an air mix door 19, which is located on the side where a cold air bypass passage 16 is closed; a cold air inlet 21a for introducing cold air passed through the cold air bypass passage 16 into the door-side guide member 21 is formed at an end portion, opposite to the rotary shaft 19a, of the door-side guide member 21; a warm air inlet 21b for introducing warm air passed through a warm air passage 17 into the door-side guide member 21 is formed at an end portion, on the side of the rotary shaft 19a, of the door-side guide member 21; and an air outlet opening 21c for letting out both of cold air introduced into the door-side guide member 21 from the cold water inlet 21a and warm air introduced into the door-side guide member 21 from the warm air inlet 21b toward a mixing chamber 18 is formed at a lengthwise intermediate portion of the door-side guide member 21. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicle air conditioner that mixes cold air and hot air and blows it out into a passenger compartment.

  Conventionally, a mixing chamber for mixing cold air cooled by a heat exchanger for cooling and hot air heated by a heat exchanger for heating, and a plurality of air-conditioning air mixed in the mixing chamber for blowing into the vehicle interior In order to reduce the size of the air conditioning unit in a vehicle air conditioner having an opening, a defroster opening for blowing the conditioned air to the feet of the occupant out of the plurality of openings A product that is placed closer to the cold air inflow part of the mixing chamber than the foot opening for blowing to the foot side of the mixing chamber, and placed closer to the hot air inflow part of the mixing chamber than the defroster opening is commercialized. ing.

  In this conventional technology, in the foot-def mode where the defroster opening and the foot opening are simultaneously opened, cold air flows exclusively into the defroster opening near the cold air inflow portion of the mixing chamber, and the foot opening near the hot air inflow portion of the mixing chamber Hot air will flow exclusively into the.

  For this reason, while the defroster blowing temperature becomes too low and the window glass is easily fogged, the foot blowing temperature becomes too high and the air conditioning feeling of the occupant deteriorates.

  Therefore, Patent Document 1 discloses a vehicle air conditioner that promotes the mixing of cold air and hot air in the mixing chamber to reduce the temperature difference between the defroster blowing temperature and the foot blowing temperature. In Patent Document 1, a rib that protrudes so as to block a part of the cold air bypass passage is formed in the case of the air conditioning unit, and the inflow of cold air into the mixing chamber is partially suppressed by the rib.

As a result, the cool air flowing into the defroster air passage is reduced, so that the warm air is easily guided to the defroster opening, and the defroster blowing temperature rises. Further, when the warm air is easily guided to the defroster opening, the warm air flowing into the foot opening is reduced accordingly, and the foot blowing temperature is lowered. As a result, the defroster blowing temperature and the foot blowing temperature can be made uniform.
JP 2004-42804 A

  However, in the above-mentioned Patent Document 1, since the ribs block a part of the cold air bypass passage to suppress the inflow of the cold air into the mixing chamber, there is a problem that the ventilation resistance increases and the blown air amount decreases. is there.

  Further, for example, the face opening for blowing the conditioned air toward the upper body side of the occupant is disposed closer to the cold air inflow portion of the mixing chamber than the foot opening, and the foot opening is warmer than the face opening. In the vehicle air conditioner arranged close to the inflow site, in the bi-level mode in which the face opening and the foot opening are simultaneously opened, cold air flows exclusively into the face opening near the cold air inflow site of the mixing chamber. Hot air flows exclusively into the foot opening near the hot air inflow site. For this reason, since the face blowing temperature becomes too low and the foot blowing temperature becomes too high and the air conditioning feeling of the occupant is impaired, it is necessary to take measures to equalize the face blowing temperature and the foot blowing temperature. However, if the countermeasures are the same as those in Patent Document 1, the problem arises that the ventilation resistance increases and the amount of blown air decreases.

  An object of this invention is to prevent promoting mixing of cold air and warm air, suppressing the increase in ventilation resistance in view of the said point.

In order to achieve the above object, the present invention comprises a case (11) that forms an air passage through which air flows toward the passenger compartment.
A cooling heat exchanger (12) disposed in the case (11) for cooling air;
A heating heat exchanger (13) that is disposed in the case (11) on the downstream side of the air flow of the cooling heat exchanger (12), and heats the cold air that has passed through the cooling heat exchanger (12);
It is formed in the case (11) on the downstream side of the air flow of the cooling heat exchanger (12), and the cold air after passing through the cooling heat exchanger (12) flows around the heating heat exchanger (13). A cold air bypass passage (16);
A hot air passage (17) formed in the case (11) on the downstream side of the air flow of the heating heat exchanger (13) and through which the warm air after passing through the heating heat exchanger (13) flows;
Inside the case (11), the cool air bypass passage (16) and the hot air passage are formed on the downstream side of the air flow, and the cool air after passing the cool air bypass passage (16) and the warm air after passing the hot air passage (17) are A mixing chamber (18) for mixing;
Adjusting the ratio of the amount of air flowing through the cool air bypass passage (16) and the amount of air flowing through the hot air passage (17) at least by opening and closing the cold air bypass passage (16), the temperature of the blown air blown into the vehicle interior is adjusted An air mix door (19)
A plurality of case openings (23, 24, 28) formed in the case (11) for blowing the conditioned air mixed in the mixing chamber (18) into the vehicle interior;
The air mix door (19) has a rotation shaft (19a) supported rotatably with respect to the case (11), and a plate door portion (19b) that rotates integrally with the rotation shaft (19a).
The rotating shaft (19a) is disposed adjacent to the outlet portion (17a) of the warm air passage (17),
The plate door portion (19b) is adapted to rotate toward the upstream side of the air flow of the cold air bypass passage (16) when the cold air bypass passage (16) is opened from the fully closed state,
A tunnel extending in the direction perpendicular to the rotation axis (19a) along the closed surface (19d) is provided on the closed surface (19d) on the side where the cold air bypass passage (16) is closed, of both plate surfaces of the plate door portion (19b). A door-side guide member (21) formed in a shape is disposed,
A cold air inlet (21a) for introducing the cold air after passing the cold air bypass passage (16) into the door side guide member (21) at the end of the door side guide member (21) opposite to the rotation shaft (19a). ) Is formed,
At the end of the door side guide member (21) on the rotating shaft (19a) side, the hot air introduction port (21b) for introducing the hot air after passing the hot air passage (17) into the door side guide member (21). ) Is formed,
Of the door-side guide member (21), the cool air introduced into the door-side guide member (21) from the cold air inlet (21a) and the door-side guide from the hot air inlet (21b) are provided in the middle portion in the longitudinal direction. A blowout opening (21c) for blowing both hot air introduced into the member (21) toward the mixing chamber (18) is formed.

  According to this, both the cold air after passing through the cold air bypass passage (16) and the hot air after passing through the hot air passage (17) are directed from the blowing opening (21c) of the guide member (21) toward the mixing chamber (18). Therefore, the mixing of the cold air and the hot air in the mixing chamber (18) can be promoted.

  Moreover, since the guide member (21) is formed in a tunnel shape extending in the direction orthogonal to the rotation axis (19a) along the closing surface (17c), the increase in ventilation resistance by the guide member (21) is slight. . For this reason, mixing of cold air and warm air can be promoted while suppressing an increase in ventilation resistance.

  Specifically, in the present invention, a case side guide portion for guiding the warm air after passing the warm air passage (17) to the warm air introduction port (21b) is provided in the outlet portion (17a) of the warm air passage (17). 11a) is formed.

  Thereby, since the air volume of the warm air introduced into the inside of the door side guide member (21) from the warm air introduction port (21b) can be increased, the air outlet opening portion (21c) of the door side guide member (21) can be increased. The amount of warm air blown out toward the mixing chamber (18) can be increased. For this reason, mixing of cold air and warm air in the mixing chamber (18) can be further promoted.

  In addition, the present invention is specifically an elastic member that contacts the edge (20) of the cold air bypass passage (16) at the end of the door side guide member (21) on the cold air inlet (21a) side. (32) is arranged.

  Thereby, since the clearance gap between the cold wind inlet (21a) of the door side guide member (21) and the edge part (20) of the cold wind bypass channel (16) can be made small, a door side guide is provided from the cold wind inlet (21a). The amount of cold air introduced into the member (21) can be increased.

  For this reason, since the air volume of the cool air blown toward the mixing chamber (18) from the blowing opening (21c) of the guide member (21) can be increased, the mixing of the cold air and the hot air in the mixing chamber (18) is possible. Can be promoted more.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view of an air conditioning unit 10 in an indoor unit section of the vehicle air conditioner according to the present embodiment. Further, the up and down arrows and the front and rear arrows in FIG. 1 indicate directions in the vehicle-mounted state of the air conditioning unit 10. FIG. 1 shows a foot / diff mode which will be described later.

  The indoor unit portion of the present embodiment is roughly divided into an air conditioning unit 10 in FIG. 1 and a blower unit (not shown) that blows air to the air conditioning unit 10. The air conditioning unit 10 is disposed at a substantially central portion in the vehicle width direction inside an instrument panel (not shown) on the front side of the vehicle interior. On the other hand, the blower unit (not shown) is arranged offset from the center part to the passenger seat side in the inside of the instrument panel in the front part of the passenger compartment.

  As is well known, the blower unit is configured by an inside / outside air switching box for switching between outside air (vehicle exterior air) and inside air (vehicle interior air), and a blower that sucks and blows air through the inside / outside air switching box. The This blower drives a known centrifugal multiblade fan (sirocco fan) with an electric motor. The electric motor is operated by a control signal from an air conditioning control device (not shown).

  The air conditioning unit 10 includes an air conditioning case 11, and an air passage through which air flows toward the vehicle interior is configured inside the air conditioning case 11. The air conditioning case 11 is formed of a resin (for example, polypropylene) having a certain degree of elasticity and excellent in strength. Furthermore, the vehicle has a dividing surface in the vertical direction of the vehicle at a substantially central portion in the vehicle width direction (perpendicular to the paper surface in FIG. 1).

  The left and right split case accommodated an evaporator 12 that forms a cooling heat exchanger, a heater core 13 that forms a heating heat exchanger, an air mix door 19, a defroster door 30, a face / foot door 31, and the like described later. In the state, they are integrally coupled by a fastening means such as a metal spring clip or a screw.

  An air inlet space 14 indicated by a broken line in FIG. 1 is formed at the most front portion of the air conditioning case 11, and air blown by the blower of the blower unit flows into the air inlet space 14. Further, the evaporator 12 is disposed in a substantially vertical direction (substantially vertical) immediately after the air flow downstream of the air inlet space 14. As is well known, the evaporator 12 absorbs heat from the air and cools the air when the low-pressure refrigerant in the refrigeration cycle (not shown) evaporates.

  A drain outlet 15 for draining condensed water (drain water) generated in the evaporator 12 is opened at the lowest part of the air conditioning case 11 located below the evaporator 12.

  A heater core 13 is arranged in a substantially vertical direction (substantially vertical) at a predetermined interval on the air flow downstream side (vehicle rear side) of the evaporator 12. The heater core 13 heats cold air by introducing high-temperature engine cooling water (hot water) into the interior and exchanging heat between the hot water and the cold air that has passed through the evaporator 12.

  The heater core 13 is also arranged substantially in the vertical direction. In addition, arrange | positioning the evaporator 12 and the heater core 13 in a substantially up-down direction means arrange | positioning so that the surface of the core part for the heat exchange may extend in a substantially up-down direction.

  A cold air bypass passage 16 is formed in the vehicle rear side portion of the evaporator 12 of the air conditioning case 11 and in the upper portion of the heater core 13. The cold air bypass passage 16 constitutes a passage through which the cold air after passing through the evaporator 12 flows around the heater core 13.

  A warm air passage 17 is formed on the downstream side of the air flow of the heater core 13. The hot air passage 17 is a passage that guides the hot air that has passed through the heater core 13 to the mixing chamber 18, and has a shape that extends from the lower side toward the upper side.

  The mixing chamber 18 that mixes the cold air that has passed through the cold air bypass passage 16 and the hot air that has passed through the heater core 13 is disposed on the downstream side (the vehicle upper side) of the cold air bypass passage 16 and the hot air passage 17.

  Between the evaporator 12 and the heater core 13, an air mix door 19 serving as a temperature adjusting means is disposed. The air mix door 19 is heated by the heater core 13 through the cold air passing through the cold air bypass passage 16 and the inlet air passage of the heater core 13 by adjusting the opening degree of the cold air bypass passage 16 and the inlet air passage of the heater core 13. Adjust the air volume ratio with the cold air to be generated.

  The air mix door 19 is a rotary door having a rotary shaft 19a that is rotatably supported with respect to the air conditioning case 11, and a resin plate door portion 19b coupled to the rotary shaft 19a.

  The rotating shaft 19a is disposed in the upper part of the heater core 13 so as to extend in the vehicle width direction adjacent to the outlet portion 17a of the hot air passage 17, and rotates in bearing holes (not shown) on the left and right wall surfaces of the air conditioning case 11. Supported as possible.

  One end of the rotating shaft 19a protrudes outside the air conditioning case 11 and is connected to an electric actuator (not shown) via a link mechanism (not shown). This electric actuator is operated by a control signal of the air conditioning control device.

  Therefore, in this embodiment, the air mix door 19 is rotated by the electric actuator. Of course, a manual system in which the air mix door 19 is directly rotated by the manual operation force of the passenger may be employed.

  A case-side sealing surface 20 that protrudes toward the cold air bypass passage 16 is formed integrally with the air conditioning case 11 at a vehicle rear side portion of the upper end portion of the evaporator 12.

  An elastic sealing material 19 c is disposed on the peripheral edge of the plate door portion 19 b of the air mix door 19. And the elastic sealing material 19c is elastically compressed and deformed between the plate door part 19b and the case side sealing surface 20, and door sealing property is ensured.

  In FIG. 1, when the air mix door 19 is in the position indicated by a two-dot chain line position C, the maximum air-cooling position in which the hot air passage 17 is fully closed and the cold air bypass passage 16 is fully opened. Flows to the cold air bypass passage 16 side.

  When the air mix door 19 reaches the position of the two-dot chain line position D, it reaches the maximum heating position in which the hot air passage 17 is fully opened and the cold air bypass passage 16 is fully closed, and the total amount of cold air that has passed through the evaporator 12 Passed through and heated.

  For convenience of illustration, illustration of a door-side guide member 21 described later is omitted at two-dot chain line positions C and D of the air mix door 19 in FIG.

  The solid line position of the air mix door 19 shows an example of an intermediate opening position of the cold air bypass passage 16 and is a minute opening position of the cold air bypass passage 16. By rotating the air mix door 19 to an arbitrary intermediate opening position, the air volume ratio between the cold air passing through the cold air bypass passage 16 and the hot air heated by the heater core 13 and flowing through the hot air passage 17 is adjusted.

  FIG. 2 is a single perspective view of the air mix door 19. For the sake of illustration, the elastic sealing material 19c is not shown in FIG.

  Of the two plate surfaces of the plate door portion 19b of the air mix door 19, the closing surface 19d on the side that closes the cold air bypass passage 16 is formed in a tunnel shape extending along the closing surface 19d in a direction perpendicular to the rotating shaft 19a. A door side guide member 21 is arranged.

  In this example, the door side guide member 21 is formed in a U-shaped cross section with a resin material. Moreover, the dimension in the width direction (direction parallel to the rotating shaft 19a) of the door side guide member 21 is constant throughout the length direction (direction orthogonal to the rotating shaft 19a), and the width direction of the plate door portion 19b. It is slightly smaller than the dimension in the direction parallel to the rotation shaft 19a.

  The door-side guide member 21 can be fixed to the plate door portion 19b by bonding, screwing, claw fitting, or the like. The door side guide member 21 may be integrally formed with the plate door portion 19b.

  As can be seen from the above description, an air passage extending in a direction orthogonal to the rotation shaft 19a is formed between the inner wall surface of the door side guide member 21 and the closing surface 19d of the plate door portion 19b.

  At the end of the door side guide member 21 opposite to the rotary shaft 19a, a cold air introduction port 21a for introducing the cold air after passing the cold air bypass passage 18 into the door side guide member 21 is formed. The cold air introduction port 21a is opened at a position away from the rotation tip portion (the end portion opposite to the rotation shaft 19a) of the plate door portion 19b by a predetermined distance. Thereby, it is avoided that the door side guide member 21 interferes with the case side sealing surface 20.

  Further, a hot air introduction port 21b for introducing the warm air after passing the warm air passage 16 into the door side guide member 21 is formed at the end of the door side guide member 21 on the rotating shaft 19a side. The warm air inlet 21b is opened at a position near the rotating shaft 19a.

  A blowout opening 21c that opens toward the opposite side (upper side in FIG. 2) of the closing surface 19d is formed in the middle portion in the length direction of the door-side guide member 21.

  The mixing chamber 18 shown by a broken line in FIG. 1 is a cold air and hot air passage that has passed through the cold air bypass passage 16 in the upper portion of the space in which the air mix door 19 between the evaporator 12 and the heater core 13 rotates. It arrange | positions so that the warm air which passed 17 may flow in.

  In the mixing chamber 18, the cold air flowing in from the cold air bypass passage 16 and the hot air flowing in from the hot air passage 17 are mixed to adjust the temperature of the conditioned air blown into the passenger compartment. Therefore, the temperature of the conditioned air can be adjusted to a desired temperature by adjusting the opening position of the air mix door 19 described above.

  A case side guide portion 11 a for guiding the hot air that has passed through the hot air passage 17 toward the inside of the door side guide member 21 is formed integrally with the air conditioning case 11 at the outlet portion 17 a of the hot air passage 17. .

  Next, a defroster opening 23 is disposed in a substantially upper part of the mixing chamber 18 on the upper surface of the air conditioning case 11. The defroster opening 23 corresponds to the case opening in the present invention together with the face opening 24 and the foot opening 28 described later.

  The defroster opening 23 is connected to a defroster outlet (not shown) disposed in the vehicle interior via a defroster duct (not shown), and air-conditioned air (mainly from the defroster outlet toward the inner surface of the vehicle window glass). Hot air) is blown out.

  A face opening 24 is disposed behind the defroster opening 23. The face opening 24 is connected to a face air outlet (not shown) disposed in the vehicle interior via a face duct (not shown), and air-conditioned air (mainly from the face air outlet toward the upper body side of the occupant). Cold wind).

  On the vehicle rear side of the warm air passage 17, a foot passage 26 is formed so as to hang downward from above. The upper end of the foot passage 26 is opened almost entirely to form a foot passage inlet 27. The foot passage 26 is formed over substantially the entire region in the vehicle width direction inside the case.

  A foot opening 28 opens at the end (lower end) of the foot passage 26 on the downstream side of the air flow. A foot duct (not shown) that hangs downward is connected to the foot opening 28, and air is blown out from the foot outlet at the lower end of the foot duct to the foot of the occupant.

  Next, a defroster door 30 that opens and closes the defroster opening 23 is disposed in the mixing chamber 18. Similar to the air mix door 19, the defroster door 30 is a rotary door configured by connecting a plate door portion to a rotary shaft. The rotary shaft of the defroster door 30 is a portion of the defroster opening 23 on the vehicle front side. It arrange | positions so that it may extend in the vehicle width direction.

  A face / foot door 31 that opens and closes the face opening 24 and the foot passage inlet 27 is disposed below the face opening 24 and above the foot passage inlet 27. The face / foot door 31 opens and closes the foot passage entrance 27 to open and close the foot opening 28.

  Like the air mix door 19, the face / foot door 31 is a rotary door constructed by connecting a plate door to a rotary shaft. The rotary shaft of the face / foot door 31 is connected to the face opening 24 on the vehicle rear side. The foot passage entrance portion 27 is disposed so as to extend in the vehicle width direction at a portion between the foot passage inlet portion 27 and the vehicle upper side.

  The rotating shaft of the defroster door 30 and the rotating shaft of the face / foot door 31 are rotatably supported by bearing holes (not shown) on the left and right wall surfaces of the air conditioning case 11, and one end of both rotating shafts is air-conditioned. It protrudes outside the case 11 and is coupled to a common electric actuator (not shown) via a link mechanism.

  This electric actuator is operated by a control signal of the air conditioning control device. Therefore, in the present embodiment, the defroster door 30 and the face / foot door 31 are rotated in conjunction with a common electric actuator, and constitute a blow mode door that switches a blow mode for blowing conditioned air into the vehicle interior. .

  Note that the air conditioning control device for controlling the electric motor for rotating the blower unit, the electric actuator for rotating the air mix door 19 and the electric actuator for rotating the blowing mode doors 30 and 31 is a well-known micro including CPU, ROM and RAM. Consists of a computer and its peripheral circuits, sensor detection signals are input from various air conditioning sensor groups (not shown), and an air conditioning operation panel (not shown) arranged near the instrument panel in the front of the passenger compartment Operation signals are input from various air conditioning operation switches (not shown) provided.

  Next, the operation of this embodiment in the above configuration will be described. When an auto switch (not shown) of the air conditioning operation panel is turned on while a start switch (ignition switch) of a vehicle engine (not shown) is turned on, an air conditioner control program stored in the ROM of the air conditioning control device is executed.

  When the air conditioner control program is executed, operation signals on the air conditioning operation panel and detection signals detected by various air conditioning sensor groups are read. And based on these signals, the target air volume blown by the blower, the inside / outside air mode, the blowing mode, the target opening of the air mix door 19, the operation of the compressor, etc. are determined, and the determined control state is Control signals are output to various actuators so as to be obtained.

  Here, the blowing mode is determined with reference to a control map stored in advance in the air conditioning control device, and is sequentially switched to the face mode, the bi-level mode, and the foot mode. Further, when a blow mode switch (not shown) on the air conditioning operation panel is manually operated, the face mode, the bi-level mode, the foot mode, and the foot / diff mode are switched according to the operation signal. Hereinafter, the operation of the vehicle air conditioner in each blowing mode will be described.

  First, the face mode is a mode in which conditioned air is blown from the face outlet toward the upper body side of the occupant. In this face mode, the defroster door 30 is rotated to the two-dot chain line position E in FIG. 1, and the face / foot door 31 is rotated to the two-dot chain line position in FIG. Accordingly, the defroster door 30 fully closes the defroster opening 23, the face / foot door 31 fully opens the face opening 24, and the foot opening 28 is fully closed.

  In the face mode, the cool air is mainly blown out from the face air outlet, so that the air mix door 19 is set to the maximum cooling position (two-dot chain line position C in FIG. 1) and the cold air bypass passage 16 is fully opened. Of course, the air mix door 19 may be blown out of the face air outlet by mixing the cold air and the hot air in the mixing chamber 18 with the air mix door 19 at the intermediate opening position.

  Although not shown, in this face mode, the door-side guide member 21 of the air mix door 19 is adapted to follow the cold air flow direction from the evaporator 12 side toward the cold air bypass passage 16 side. When the cool air is caused to flow into the bypass passage 16, the ventilation resistance by the door side guide member 21 hardly occurs. As a result, it is possible to exert the maximum cooling capacity by blowing out the maximum amount of cool air from the face outlet.

  Next, the bi-level mode is a mode in which conditioned air is blown out from the face air outlet toward the occupant's upper body, and at the same time, conditioned air is blown out from the foot air outlet toward the occupant's feet. In this bi-level mode, the defroster door 30 is rotated to the two-dot chain line position E in FIG. 1, the defroster opening 23 is fully closed, the face / foot door 31 is rotated to the intermediate opening position, and the face opening 24 And the foot opening 28 are opened to the same extent. Note that, in the bi-level mode, the air mix door 19 is positioned at the intermediate opening position in order to blow out the conditioned air at a temperature according to the passenger's preference from the face outlet and the foot outlet.

  Next, the foot mode is a mode in which conditioned air is blown out mainly from the foot outlet and the rear foot outlet toward the occupant's feet. In this foot mode, the defroster door 30 is rotated to a position where the defroster opening 23 is slightly opened. Further, the face / foot door 31 is rotated to the solid line position of FIG. 1 to fully close the face opening 24 and fully open the foot opening 28.

  Since the foot mode is mainly selected when the outside temperature of the vehicle is low, the defroster door 30 is in a state where the defroster opening 23 is slightly opened to prevent the vehicle window glass from being fogged. In the present embodiment, the opening degree of the defroster opening 23 is set to about 20% of the fully opened state.

  In the foot mode, the hot air is blown out mainly from the foot outlet and the rear foot outlet, so the air mix door 19 is set to the maximum heating position (two-dot chain line position D in FIG. 1) and the cold air bypass passage 16 is fully closed. To do. Of course, the conditioned air in which the cold air and the hot air are mixed may be blown out in the mixing chamber 18 at the intermediate opening position.

  Next, the foot / def mode is a mode in which conditioned air is blown simultaneously from the defroster outlet, the foot outlet, and the rear foot outlet toward the vehicle window glass side and the occupant's foot side. In this foot / def mode, the defroster door 30 is rotated to an intermediate opening position (solid line position in FIG. 1), and the face / foot door 31 is rotated to a position where the face opening 24 is fully closed (solid line position in FIG. 1). Operated. In the present embodiment, the opening degree of the defroster opening 23 is set to about half the opening degree of the fully opened state.

  Since the foot / def mode is a mode selected by the operation of the occupant, the position of the air mix door 19 is used to blow the conditioned air at a temperature according to the occupant's preference from the defroster outlet, the foot outlet, and the rear foot outlet. Is the intermediate opening position.

  When the air mix door 19 is rotated to a minute opening position as shown by the solid line in FIG. 1 of the cold air bypass passage 16, the cold air introduction port 21 a of the door side guide member 21 is protruded from the protruding end of the case side seal surface 20. 1 (the vehicle rear side end portion in FIG. 1) and the warm air introduction port 21b of the door side guide member 21 is the downstream end portion of the case side guide portion 11a in the warm air flow (the vehicle front side end portion in FIG. 1). )

  In this example, until the air mix door 19 rotates about 10 ° in the opening direction from the fully closed position of the cold air bypass passage 16, the cold air inlet 21 a of the door side guide member 21 is the protruding tip of the case side seal surface 20. The hot air inlet 21b of the door side guide member 21 is close to the downstream end of the case side guide portion 11a.

  As a result, a part of the cold air flowing through the cold air bypass passage 16 as indicated by the arrow F is guided into the door side guide member 21 from the cold air introduction port 21a, and one of the hot air flowing through the hot air passage 17 as indicated by the arrow G The part is led into the door side guide member 21 from the hot air inlet 21b.

  Then, the cool air (arrow F) and the warm air (arrow G) are mixed inside the door side guide member 21 and blown out from the blowout opening 21c toward the mixing chamber 18 as shown by the arrow H. For this reason, mixing of cold air and warm air can be promoted.

  For this reason, since mixing with cold air and warm air can be accelerated | stimulated, while defroster blowing temperature can be raised, foot blowing temperature can be reduced. As a result, the temperature difference between the defroster blowing temperature and the foot blowing temperature can be reduced, so that the defroster blowing temperature becomes too low and fogging of the window glass is likely to occur, and the foot blowing temperature becomes too high and the occupant It is possible to prevent the air conditioning feeling from deteriorating.

  A part of the cool air flowing through the cool air bypass passage 16 flows directly from the gap between the door-side guide member 21 and the protruding tip of the case-side seal surface 20 to the defroster opening 23 as indicated by an arrow J. The blowing temperature will be lowered.

  Therefore, it is desirable that the gap between the door-side guide member 21 and the protruding tip of the case-side seal surface 20 is as small as possible. However, if the gap is too small, the door-side guide member 21 may be caused by manufacturing errors or the like. And the case-side sealing surface 20 may interfere with each other.

  Therefore, in order to avoid interference between the door-side guide member 21 and the case-side seal surface 20 due to manufacturing errors or the like, the cold air inlet 21a of the door-side guide member 21 and the projecting tip of the case-side seal surface 20 The interval is preferably set to 3 mm or more. On the other hand, if the distance is too large, the cold air cannot be guided to the inside of the door side guide member 21, so it is desirable to set the distance to 10 mm or less.

(Second Embodiment)
In the second embodiment, as shown in FIG. 3, as compared to the first embodiment, the cold air inlet 21 a of the door side guide member 21 is elastically protruded toward the protruding tip of the case side seal surface 20. By disposing the member 32, the gap between the cold air inlet 21a of the door side guide member 21 and the protruding tip of the case side seal surface 20 is reduced.

  In this example, the elastic member 32 is made of an elastomer and is integrally formed with the door side guide member 21.

  The elastic member 32 comes into contact with the protruding tip of the case-side seal surface 20 when the air mix door 19 is rotated to the minute opening position of the cold air bypass passage 16 as shown by the solid line position in FIG. It is formed with various protruding dimensions.

  As a result, a part of the cold air flowing through the cold air bypass passage 16 is directly defrosted from the gap between the cold air inlet 21a of the door side guide member 21 and the protruding tip of the case side seal surface 20 as indicated by an arrow J in FIG. Since it can suppress flowing into the opening part 23, the temperature difference of defroster blowing temperature and foot blowing temperature can be reduced more.

(Other embodiments)
In addition, the number, the shape, and the arrangement position of the blowing openings 21c in the door-side guide member 21 of each of the above embodiments are merely examples, and the number of the blowing openings 21c according to required temperature distribution characteristics and the like. The shape and the arrangement position can be changed as appropriate.

  Moreover, in each said embodiment, although the door side guide member 21 is formed in the cross-sectional U-shape, it is not limited to a cross-sectional U-shape, For example, even if it forms in cross-sectional arc shape etc. Good.

  Moreover, in each said embodiment, although the one air mix door 19 opens and closes both the cold wind bypass channel 16 and the inlet ventilation path of the heater core 13, only the cold wind bypass channel 16 is connected to the air mix door 19. You may comprise by two doors, the door which opens and closes, and the door which opens and closes only the inlet ventilation path of the heater core 13. FIG. In this case, the door-side guide member 21 is disposed on a door that opens and closes only the cold air bypass passage 16.

  In addition, the arrangement of the openings 23, 24, and 28 in the air conditioning case 11 of each of the above embodiments is merely an example, and of course, the arrangement of the openings 23, 24, and 28 can be changed as appropriate. It is.

It is sectional drawing which shows schematic structure of the air conditioning unit of the vehicle air conditioner by 1st Embodiment of this invention. It is a perspective view of the air mix door of FIG. It is sectional drawing of the air mix door by 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Case, 11a ... Case side guide part, 12 ... Evaporator (heat exchanger for cooling),
13 ... Heater core (heat exchanger for heating), 16 ... Cold air bypass passage, 17 ... Hot air passage,
18 ... mixing chamber, 19 ... air mix door, 19a ... rotating shaft, 19b ... plate door part,
19d ... closed surface, 21 ... door side guide member, 21a ... cold air inlet, 21b ... hot air inlet,
21c ... Blowout opening, 23 ... Defroster opening (case opening),
24: Face opening (case opening), 28 ... Foot opening (case opening).

Claims (3)

A case (11) that forms an air passage through which air flows toward the passenger compartment;
A cooling heat exchanger (12) disposed in the case (11) for cooling the air;
A heating heat exchanger (13) that is disposed on the downstream side of the air flow of the cooling heat exchanger (12) in the case (11) and that heats the cold air that has passed through the cooling heat exchanger (12); ,
It is formed in the case (11) on the downstream side of the air flow of the cooling heat exchanger (12), and the cool air after passing through the cooling heat exchanger (12) bypasses the heating heat exchanger (13). Cold air bypass passage (16) flowing in the
A hot air passage (17) formed in the case (11) on the downstream side of the air flow of the heating heat exchanger (13) and through which the warm air after passing through the heating heat exchanger (13) flows;
Inside the case (11), the cool air is formed downstream of the cold air bypass passage (16) and the hot air passage, and after passing through the cold air bypass passage (16) and after passing through the hot air passage (17). A mixing chamber (18) for mixing the warm air of
A blowout blown into the vehicle interior by opening and closing at least the cold air bypass passage (16) and adjusting the ratio of the amount of air flowing through the cold air bypass passage (16) and the amount of air flowing through the hot air passage (17). An air mix door (19) for adjusting the air temperature;
A plurality of case openings (23, 24, 28) formed in the case (11) for blowing out the conditioned air mixed in the mixing chamber (18) into the vehicle interior;
The air mix door (19) includes a rotation shaft (19a) supported rotatably with respect to the case (11), and a plate door portion (19b) that rotates integrally with the rotation shaft (19a). And
The rotating shaft (19a) is disposed adjacent to the outlet (17a) of the hot air passage (17),
The plate door portion (19b) is adapted to rotate toward the upstream side of the air flow of the cold air bypass passage (16) when the cold air bypass passage (16) is opened from the fully closed state.
Of the two plate surfaces of the plate door portion (19b), the closing surface (19d) on the side that closes the cold air bypass passage (16) is orthogonal to the rotating shaft (19a) along the closing surface (19d). A door-side guide member (21) formed in a tunnel shape extending in the direction is arranged,
Cold air that introduces cold air after passing through the cold air bypass passage (16) into the door-side guide member (21) at an end of the door-side guide member (21) opposite to the rotating shaft (19a). An inlet (21a) is formed,
Hot air that introduces hot air after passing through the hot air passage (17) into the door side guide member (21) at the end of the door side guide member (21) on the rotating shaft (19a) side. An inlet (21b) is formed,
Of the door-side guide member (21), in the middle portion in the longitudinal direction, cold air introduced into the door-side guide member (21) from the cold air inlet (21a), and the hot air inlet (21b) The vehicle air conditioner is characterized in that a blowout opening (21c) is formed through which both hot air introduced into the door side guide member (21) is blown out toward the mixing chamber (18). A case side guide portion (11a) for guiding the warm air after passing through the warm air passage (17) to the warm air inlet (21b) is formed at the outlet portion (17a) of the warm air passage (17). The vehicle air conditioner according to claim 1, wherein An elastic member (32) that contacts the edge (20) of the cold air bypass passage (16) is disposed at the end of the door side guide member (21) on the cold air inlet (21a) side. The vehicle air conditioner according to claim 1 or 2.

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