JP4433169B2 - Air conditioner for vehicles - Google Patents

Description

  The present invention relates to a vehicle air conditioner that selectively blows conditioned air to a plurality of locations in a vehicle compartment.

  2. Description of the Related Art Conventionally, a vehicle air conditioner that is mounted on an automobile and performs air conditioning in a passenger compartment is known.

  For example, as disclosed in Patent Document 1, a vehicle air conditioner includes a cooling heat exchanger and a heating heat exchanger in a casing, and the cooling heat exchanger or the heating heat exchange is provided. Air that is harmonized with the vessel can be selectively supplied from at least one of a defroster port that blows out the inner surface of the windshield, a vent port that blows out to the passenger's face and chest, and a foot port that blows out under the passenger's feet. .

  By the way, in the said vehicle air conditioner, the cold air channel | path with which the heat exchanger for cooling was arrange | positioned, and the hot air channel | path with which the heat exchanger for heating were arrange | positioned connected to the air mix space, and distribute | circulated both the channel | paths. Conditioned air is generated by mixing air in the air mix space. In the air mix space, the upstream end of the first passage connected to the defroster port and the vent port communicates with the cold air passage side. On the other hand, in the air mix space, the upstream end of the second passage connected to the foot port communicates with the warm air passage side.

  As described above, the vehicle air conditioner forms the upstream end of the second passage closer to the hot air passage, so that, for example, in the differential foot mode in which conditioned air is blown from the defroster port and the foot port, The temperature of the conditioned air blown out from the vehicle is improved so that the passenger's feet can be heated efficiently.

Moreover, the air mix space in this vehicle air conditioner is provided with a switching door that switches the flow path of the conditioned air mixed in the air mix space according to each operation mode. For example, in the heat mode, most of the warm air heated by the heat exchanger for heating is caused to flow into the second passage and blown out from the foot port, and at the same time, the remaining warm air is caused to flow into the first passage. I try to make it blow more. And while warming a passenger | crew's leg | foot, the freezing of the windshield inner surface and prevention of frost formation are performed (refer patent document 1).
Japanese Patent Laid-Open No. 11-227442

  However, during the heat mode of the vehicle air conditioner disclosed in Patent Document 1, the warm air heated by the heat exchanger for heating is defrosted from the air mix space via the first passage. When flowing into the air mix space, a space that connects the air mix space and the first passage by the displacement of the switching door is formed closer to the cooling passage side in the air mix space. For this reason, compared with the temperature of the warm air diverted from the air mix space to the second passage, the temperature of the hot air diverted from the air mix space to the first passage is lowered. For this reason, the temperature of the warm air that passes through the first passage and is blown out from the defroster port to the inner surface of the windshield becomes low, and the effect of preventing freezing and frost formation on the inner surface of the windshield may be reduced.

  The present invention has been made in view of such points, and the object of the present invention is to increase the temperature of the warm air blown from the defroster port to the inner surface of the windshield in the heat mode, thereby freezing and landing on the inner surface of the windshield. It is intended to improve the frost prevention effect.

  In the present invention, in the heat mode, the warm air flowing into the air mix space is bypassed from the vicinity of the second passage to the first passage and guided to the defroster port.

Specifically, in the first invention, an air passage extending from the air inlet to the air outlet is formed in a casing in which a plurality of air outlets including an air inlet, a defroster opening, and a foot opening are formed. The air passage is formed by connecting a cold air passage in which a heat exchanger for cooling is arranged, a hot air passage in which a heat exchanger for heating is arranged, the cold air passage and the downstream end of the hot air passage, respectively. An air mix space that mixes the air that has passed through both passages, a first passage that allows the air mix space and the defroster port to communicate with each other, a space near the hot air passage in the air mix space, and the foot port A second passage that can communicate with the first air passage, and the casing includes a first inner wall portion formed along the air mix space and the first passage from a downstream end of the cold air passage, the second passage, First A temperature control door that opens and closes a downstream end opening of the cold air passage, and an upstream end opening of the second passage provided in the air mix space. A rotary door that is displaced between a first state that closes the second passage and a second state that opens the upstream end opening of the second passage, and a part of the warm air heated by the heat exchanger for heating is provided. It is premised on a vehicle air conditioner that can be operated in a heat mode in which the hot air blown out from the foot port and the remaining warm air heated by the heating heat exchanger is blown out from the defroster port. In the vehicle air conditioner, in the heat mode, the rotary door that is in the second state forms the seal portion at a portion between the air mix space and the first passage in the first inner wall portion. An air mix space and the first passage are blocked, and a gap is formed between the rotary door and the second inner wall to allow air flow from the second passage to the first passage. It is a feature.

  In the first aspect, in the heat mode, the warm air heated by the heating heat exchanger disposed in the warm air passage is distributed to the air mix space. Here, a rotary door is provided in the air mix space, and the rotary door is in the second state in the heat mode. When the rotary door is in the second state, part of the warm air flowing through the air mix space flows through the second passage and blows out from the foot opening toward the feet of the occupant. On the other hand, the remaining warm air flowing through the air mix space flows into a bypass passage formed between the inner wall of the casing constituting the second passage and the outer edge of the rotary door. And this warm air flows in into a 1st channel | path from a bypass channel | path, and blows off toward a windshield inner surface from a defroster port.

  Here, the bypass passage is formed in the vicinity of the second passage formed near the warm air passage. Therefore, for example, the temperature of the hot air passing through the bypass passage can be increased as compared with the case where the bypass passage is formed closer to the cold air passage. Therefore, the temperature of the warm air blown from the defroster port to the inner surface of the windshield can be increased.

The second invention is convex in the vehicle air conditioning apparatus of the first aspect of the invention, the seal portion, and the seal is formed on the outer edge of the rotary door member, in contact with said sealing portion protrudes inwardly from the inner wall of the casing It is comprised by the part.

In the second aspect of the invention, the sealing material is formed on the outer edge of the rotary door, while the convex portion that comes into contact with the sealing material is formed on the inner wall of the casing, so that the effects of the second aspect of the invention can be easily obtained. it can.

  In the present invention, the following effects are exhibited.

  According to the first aspect, in the heat mode, the warm air flowing into the air mix space is circulated from the vicinity of the second passage to the first passage through the bypass passage. And the temperature of the warm air which distribute | circulates a 1st channel | path and is blown off from the defroster port to the inner surface of a windshield can be raised. Therefore, it is possible to improve the effect of preventing the windshield from freezing and frosting in the heat mode.

  Here, since the bypass passage is formed between the outer edge of the rotary door and the inner wall of the casing constituting the second passage, for example, it is necessary to process the bypass passage in the rotary door or to provide a separate switching door. Absent. That is, the bypass passage can be formed with a simple device structure, and the effect of preventing the above-described windshield freezing and frost formation can be improved.

According to the second aspect, while forming a sealing material to the outer edge of the rotary door, by forming the sealing material abutting convex portions on the casing inner wall, possible to easily realize the effects of the second invention Can do.

  Further, the range in which the rotary door is displaced (range from the first state to the second state) can be determined by bringing the convex portion and the outer edge of the rotary door into contact with each other. Therefore, the rotary door can be displaced to an appropriate angle, and for example, a bypass passage can be reliably formed between the rotary door in the second state and the inner wall of the casing constituting the second passage.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, “front” refers to the front side of the vehicle on which the vehicle air conditioner is mounted, “rear” refers to the rear side of the vehicle, “left” refers to the left side of the vehicle, and “right”. Means the right direction of the vehicle.

  FIG. 1 is a schematic configuration diagram of a vehicle air conditioner 1 according to the present embodiment. Although not shown, the vehicle air conditioner 1 is provided at a substantially central portion in the left-right direction within an instrument panel of an automobile.

  The vehicle air conditioner 1 includes a casing 3 formed by combining a resin-made left case component (not shown) and a right case component 2. The casing 3 is formed with an air inlet 19 and an air outlet including a defroster port 12, a vent port 13, and a foot port 14. Further, an air passage is formed in the casing 3 from the air inlet 19 to the air outlet.

  A fan housing 7 that houses the blower fan 5 is formed on the front side of the upper half of the casing 3. The fan housing 7 is formed in a cylindrical shape having a center line extending in the left-right direction. And the sirocco fan which comprises the ventilation fan 5 is accommodated in the center part of the fan housing 7 in the state which orient | assigned the rotating shaft to the left-right direction. In addition, an air outflow passage 17 is formed around the blower fan 5 of the fan housing 7 where the flow of air blown out from the blower fan 5 gathers. The downstream end of the air outflow passage 17 opens at the lower side of the fan housing 7. An attachment port 18 for a motor (not shown) for driving the blower fan 5 is formed on the left side wall of the fan housing 7. On the other hand, an air inlet 19 is formed in the right side wall of the fan housing 7. An intake box (not shown) is connected to the air inlet 19. The intake box is formed with an outside air introduction port for introducing air outside the vehicle compartment and an inside air introduction port for introducing air inside the vehicle compartment. The outside air introduction port and the inside air introduction port are opened and closed by an inside / outside air switching door disposed inside the intake box.

  A cold air passage 20 connected to the downstream end of the air outflow passage 17 and extending obliquely backward on the lower side is formed on the front end side of the lower half of the casing 3. An evaporator 10 that is a heat exchanger for cooling is installed in the cold air passage 20. The evaporator 10 is connected to a refrigerant circuit (not shown) and functions as an evaporator by performing an evaporation process of a refrigeration cycle. Although not shown, the evaporator 10 includes a so-called tube and fin type heat exchanger in which tubes and heat transfer fins are alternately arranged and integrated. And the evaporator 10 cools to-be-processed air because the refrigerant | coolant which circulates through this evaporator 10 takes away the heat of to-be-processed air.

  An upstream end of the hot air passage 21 is connected to the cold air passage 20 on the downstream side of the evaporator 10. A vertical wall 23 extending upward from the bottom wall of the casing 3 is formed between the upstream end of the hot air passage 21 and the cold air passage 20 so as to partition both the passages 21 and 20. A first opening 24 constituting an upstream end opening of the hot air passage 21 is formed in the upper half of the vertical wall 23. In addition, a second opening 25 is formed above the first opening 24 so as to extend from the upper end of the vertical wall 23 to the vicinity of the upper end on the downstream side of the evaporator 10. 20 downstream end openings are formed.

  A plate-like temperature control door 27 that selectively opens and closes the first opening 24 and the second opening 25 is disposed near the upper end of the vertical wall 23. The temperature control door 27 is supported on the casing 3 by a support shaft 27a extending in the left-right direction. The temperature control door 27 is driven by an actuator (not shown), and is configured to be rotatable within a range shown in FIG. And when the temperature control door 27 will be in the state shown to I of FIG. 1, while the 1st opening part 24 will be in a fully open state, the 2nd opening part 25 will be in a fully closed state. Moreover, when the temperature control door 27 is in the state shown in II of FIG. 1, the second opening 25 is fully opened, while the first opening 24 is fully closed. Further, by rotating the temperature control door 27 at an intermediate position between the state I and the state II, both the first opening 24 and the second opening 25 are opened, and the temperature at the intermediate position is increased. The amount of air to be processed that passes through both openings 24 and 25 varies depending on the rotation angle of the adjustment door 27.

  In the vicinity of the vertical wall 23 of the hot air passage 21, the heater core 11 that is a heat exchanger for heating is disposed. The heater core 11 is formed of a so-called tube and fin type heat exchanger, like the evaporator 10. The heater core is connected to the coolant passage of the in-vehicle engine via a heater pipe. And the cooling water heated up by engine cooling distribute | circulates the inside of the heater core 11, and the cold wind from the cold wind path 20 passes the heater core 11, and is heated.

  An air mix space 29 is formed above the second opening 25 to connect the downstream end of the cool air passage 20 and the downstream end of the hot air passage 21. And the air mix space 29 is comprised so that the conditioned air which distribute | circulated the cold wind channel | path 20 and the warm air channel | path 21 may be mixed. Specifically, in the air mix space 29, the cold air cooled by the cold air passage 20 and the warming are adjusted by the opening degree of the first opening 24 and the second opening 25 adjusted by the rotation angle of the temperature control door 27. The warm air heated in the passage 21 flows in at a predetermined distribution amount. And the said cool air and the said warm air are mixed in an air mix space, and become predetermined | prescribed conditioned air.

  In addition, a duct 30 that extends substantially in the vertical direction is formed on the rear side of the casing 3. The upper end portion of the duct 30 extends to substantially the same height as the upper end portion of the fan housing 7. The defroster port 12 is formed near the front side of the upper end of the duct 30. A defroster nozzle that opens near the lower end of the front window is connected to the defroster port 12 via a defroster duct (not shown). Further, the vent port 13 is formed near the rear side of the upper end portion of the duct 30. A vent nozzle that opens toward the occupant's face and chest is connected to the vent port 13 via a vent duct (not shown). Further, the foot opening 14 is formed at the lower end of the duct 30. A foot duct extending to the feet of the front seat occupant and the feet of the rear seat occupant is connected to the foot opening 14 (not shown).

  In the upper half of the duct 30, a first passage 31 is formed, the upstream end of which is connected to the upper portion of the air mix space 29 and can communicate with the defroster port 12 or the vent port 13. The upstream end of the first passage 31 is formed to face the second opening 25. A first seal surface 61 is formed on the wall surface of the fan housing 7 where the upstream end of the first passage 31 is formed.

  In addition, a differential vent switching door 55 is disposed downstream of the first passage 31 and below the defroster port 12 and the vent port 13. The differential vent switching door 55 is formed like a plate like the temperature control door 27 and is supported on the casing 3 by a support shaft 55a extending in the left-right direction. The differential vent switching door 55 is driven by an actuator (not shown), and is configured to be rotatable within a range shown in FIG. When the differential vent switching door 55 is in the state shown in FIG. 1 III, the defroster side opening 56 is fully closed while the vent side opening 57 is fully open. When the differential vent switching door 55 is in the state shown in IV of FIG. 1, the vent side opening 57 is fully closed, while the defroster side opening 56 is fully open.

  In the lower half of the duct 30, a second passage 32 is formed which has an upstream end connected to a space near the warm air passage 21 in the air mix space 29 and communicates with the foot opening 14. The second passage 32 is formed to extend downwardly inclined from the upstream end opening and then bend and extend substantially vertically downward. Further, a partition wall 51 is formed between the second passage 32 and the hot air passage 21, and the second passage 32 and the hot air passage 21 are in close proximity with the partition wall 51 interposed therebetween. Yes. The partition wall 51 is curved downward so as to be positioned on the lower side as it goes rearward. A second seal surface 62 is formed at the front end of the partition wall 51 so as to abut against a sealant for a rotary door described later. In the inner wall of the casing 3 constituting the second passage 32, a protruding plate 52 that protrudes inward is formed near the upstream end of the second passage 32. On the upper surface side of the projecting plate 52, a third seal surface is formed on which a sealing material of a rotary door described later comes into contact.

  Furthermore, the air mix space 29 is provided with the rotary door 35 which is a feature of the present invention. As shown in FIG. 2, the rotary door 35 includes a rotating shaft 38 that extends in the left-right direction of the casing 3, a closing wall portion 36 that rotates about the rotating shaft 38, and the closing wall portion 36. And end wall portions 37 formed at both ends in the left-right direction, which is the axial direction.

  The closing wall portion 36 is configured by a rectangular flat plate extending substantially parallel to the rotation shaft 38. Further, the end wall portion 37 has a substantially triangular shape extending from the rotation shaft 38 to the closing wall portion 36. The both end wall portions 37 hold the left and right ends of the closing wall portion 36 while maintaining a state substantially perpendicular to the closing wall portion 36. Further, the rotation shaft 38 protrudes leftward from the left end wall portion 37, while the rotation shaft 38 protrudes rightward from the right end wall portion 37. And the protrusion part of the said rotating shaft 38 is inserted in the through-hole formed in the left side wall and the right side wall of the casing 3, respectively. The rotary door 35 is configured to be rotatable about a rotation shaft 38.

  Further, flanges 39 that are continuous from the left end wall portion 37 to the right end wall portion 37 are formed at both edges in the rotational direction of the closing wall portion 36 and the end wall portion 37 in the rotary door 35. In the flange 39, a foam resin sealing material 40a is attached to both sides of the flange 39a near the first passage 31 (upper side in FIG. 2). On the other hand, the sealing material 40b is attached only to the lower surface side of the flange 39b near the second passage 32 (lower side in FIG. 2).

  Since the rotary door 35 as described above is displaced about the rotation shaft 38, the flow direction of the conditioned air in the air mix space 29 can be switched. Specifically, the rotary door 35 is displaced between the first state shown in V of FIG. 1 and the second state shown in VI of FIG. 1 by rotating within the range shown in FIG. It is configured. When the rotary door 35 is in the first state, the upstream end opening of the first passage 31 is fully opened, and the air mix space 29 and the first passage 31 communicate with each other, while the upstream end opening of the second passage 32 is fully open. Closed. At this time, the sealing material 40a formed on the flange 39a and the third sealing surface 63 of the protruding plate 52 come into contact with each other, and at the same time, the sealing material 40b formed on the flange 39b and the second seal portion 62 of the partition wall 51 Abut.

  On the other hand, as shown in FIG. 7, when the rotary door 35 is in the second state, the upstream end opening of the second passage 32 is fully opened, and the air mix space 29 and the second passage 32 communicate with each other. At this time, the sealing material 40a formed on the flange 39a of the rotary door 35 and the first sealing surface 61 abut, while the sealing material 40b formed on the flange 39b does not abut on any sealing portion. Become. A bypass passage 50 is formed between the end of the rotary door 35 on the flange 39 b side and the inner wall of the casing 3 constituting the second passage 32. For this reason, the air mix space 29 and the first passage 31 communicate with each other via the bypass passage 50.

  Further, the amount of conditioned air distributed from the air mix space 29 to the first passage 31 and the second passage 32 is changed by rotating the rotary door 35 at an intermediate position between the first state and the second state.

-Driving action-
Next, the driving | running operation | movement of the vehicle air conditioner 1 which concerns on embodiment is demonstrated. The vehicle air conditioner 1 is configured to be able to select a vent mode, a defroster mode, a differential foot mode, a bi-level mode, and a heat mode. Below, the driving | running operation | movement of the vehicle air conditioner 1 in each mode is demonstrated in order, referring FIGS. 3-7. 3 to 7 show the flow of air when the rotary door 35 is viewed from the XX section of FIG. In each of the following modes, the evaporator 10 switches between an ON state (a state that functions as an evaporator) and an OFF state (a stopped state) according to a temperature detected by a switch provided on the instrument panel or a temperature sensor (not shown). Although it is configured freely, in the following description, a typical state of the evaporator in each mode is illustrated.

<Vent mode>
First, an example of operation in the vent mode in the vehicle air conditioner 1 will be described with reference to FIG. The vent mode is an operation mode in which cold air cooled by the vehicle air conditioner 1 is supplied from the vent port 13 toward the occupant's face and chest. In this vent mode, the temperature control door 27 is in the state II shown in FIG. Further, the differential vent switching door 55 is in the state shown in III of FIG. 1, and the rotary door 35 is in the state of V (first state) shown in FIG.

  When the occupant selects the vent mode from the instrument panel, the blower fan 5 is activated and the evaporator 10 is turned on, for example. When the air to be treated is introduced from the air introduction port 19, the air to be treated flows into the cold air passage 20 from the air outflow passage 17. The air to be treated is cooled by the evaporator 10. The cold air cooled by the evaporator 10 flows into the air mix space 29. Further, the cold air flows from the air mix space 29 into the first passage 31. The cold air is blown out of the casing 3 through the vent port 13 and supplied toward the face and chest of the passenger.

<Defroster mode>
Next, an operation example in the defroster mode in the vehicle air conditioner 1 will be described with reference to FIG. The defroster mode is an operation mode in which warm air heated by the vehicle air conditioner 1 is supplied from the defroster port 12 toward the inner surface of the windshield. In the defroster mode, the temperature control door 27 is in the state I shown in FIG. Further, the differential vent switching door 55 is in the state indicated by IV in FIG. 1, and the rotary door 35 is in the state V (first state) shown in FIG.

  When the occupant selects the defroster mode from the instrument panel, the blower fan 5 is activated while the evaporator 10 is in an OFF state, for example. When the air to be treated is introduced from the air introduction port 19, the air to be treated flows into the cold air passage 20 from the air outflow passage 17. Then, the air to be treated passes through the evaporator 10 and the first opening 24 and flows into the warm air passage 21. This air to be treated is heated by the heater core 11 to become hot air.

  The warm air thus heated flows into the first passage 31 from the air mix space 29. The warm air is blown out of the casing 3 through the defroster port 12 and supplied toward the inner surface of the windshield.

<Differential foot mode>
Next, an operation example in the differential foot mode in the vehicle air conditioner 1 will be described with reference to FIG. The differential foot mode is an operation mode in which conditioned air conditioned to an arbitrary temperature by the vehicle air conditioner 1 is supplied from the defroster port 12 toward the inner surface of the windshield and simultaneously supplied from the foot port 14 toward the foot of the occupant. is there. In the differential foot mode, the temperature control door 27 is displaced by a predetermined angle in the range a shown in FIG. Further, the differential vent switching door 55 is in the state shown in IV of FIG. Further, the rotary door 35 is displaced at an intermediate position between the state V (first state) in FIG. 1 and the state VI (second state) in FIG.

  When the occupant selects the differential foot mode from the instrument panel, the blower fan 5 is activated and the evaporator 10 is turned on, for example. When the air to be treated is introduced from the air introduction port 19, the air to be treated flows into the cold air passage 20 from the air outflow passage 17. The air to be treated is cooled by the evaporator 10. A part of the cool air cooled by the evaporator 10 passes through the first opening 24 and flows into the warm air passage 21. This cold air is heated by the heater core 11 to become hot air. This warm air flows into the air mix space 29. On the other hand, the remaining cool air cooled by the evaporator 10 passes through the second opening 25 and flows into the air mix space 29. And this cold air and the said warm air are mixed in the air mix space 29, and become conditioned air of predetermined temperature.

  The conditioned air is divided into the first passage 31 and the second passage 32 by the rotary door 35. The conditioned air flowing into the first passage 31 from the air mix space 29 is blown out of the casing 3 through the defroster port 14 and supplied toward the inner surface of the windshield. On the other hand, the conditioned air that has flowed into the second passage 32 from the air mix space 29 is blown out of the casing 3 through the foot port 14 and supplied toward the feet of the occupant.

<Bi-level mode>
Next, an operation example in the bi-level mode in the vehicle air conditioner 1 will be described with reference to FIG. In the bi-level mode, conditioned air conditioned to an arbitrary temperature by the vehicle air conditioner 1 is supplied from the vent port 13 toward the occupant's face and chest and simultaneously from the foot port 14 toward the occupant's feet. It is an operation mode. In this bi-level mode, the temperature control door 27 is displaced by a predetermined angle within the range a shown in FIG. Further, the differential vent switching door 55 is in the state shown in III of FIG. Further, the rotary door 35 is displaced at an intermediate position between the state V (first state) in FIG. 1 and the state VI (second state) in FIG.

  When the occupant selects the bi-level mode from the instrument panel, the blower fan 5 is activated and the evaporator 10 is turned on, for example. When the air to be treated is introduced from the air introduction port 19, the air to be treated flows into the cold air passage 20 from the air outflow passage 17. The air to be treated is cooled by the evaporator 10. For example, a part of the cool air cooled by the evaporator 10 passes through the first opening 24 and flows into the warm air passage 21. This cold air is heated by the heater core 11 to become hot air. This warm air flows into the air mix space 29. On the other hand, the remaining cool air cooled by the evaporator 10 passes through the second opening 25 and flows into the air mix space 29. And this cold wind and the said warm air are mixed in the air mix space 29, and become conditioned air of predetermined temperature.

  The conditioned air is divided into the first passage 31 and the second passage 32 by the rotary door 35. The conditioned air flowing into the first passage 31 from the air mix space 29 is blown out of the casing 3 through the vent port 13 and supplied toward the face and chest of the passenger. On the other hand, the conditioned air that has flowed into the second passage 32 from the air mix space 29 is blown out of the casing 3 through the foot port 14 and supplied toward the feet of the occupant.

<Heat mode>
Next, an operation example in the heat mode, which is a feature of the present invention, will be described with reference to FIG. In the heat mode, most of the warm air heated by the vehicle air conditioner 1 is supplied from the foot port 14 toward the occupant's feet, and the remaining warm air is directed from the defroster port 12 toward the inner surface of the windshield. This is the operation mode to be In this heat mode, the temperature control door 27 is in the state I shown in FIG. 1, and the differential vent switching door 55 is in the state shown in IV in FIG. And the said rotary door 35 will be in the state (2nd state) of VI shown in FIG.

  When the occupant selects the heat mode from the instrument panel, the blower fan 5 is activated while the evaporator 10 is in an OFF state, for example. When the air to be treated is introduced from the air introduction port 19, the air to be treated flows into the cold air passage 20 from the air outflow passage 17. Then, the air to be treated passes through the evaporator 10 and the first opening 24 and flows into the warm air passage 21. This air to be treated is heated by the heater core 11 to become hot air. Then, this warm air flows into the air mix space 29.

  Here, in the air mix space 29, since the rotary door 35 is in the second state, the sealing material 40a of the flange 39a and the first sealing surface 61 abut, while the sealing material 40b of the flange 39b is It will be in the state which does not contact | abut. A bypass passage 50 is formed on the inner wall of the casing 3 constituting the second passage 32 and the outer edge of the rotary door 35 near the second passage 32 side. Therefore, a part of the warm air flowing into the second passage 32 from the air mix space 29 flows into the first passage 31 via the bypass passage 50. And the warm air which distribute | circulated the 1st channel | path 31 is supplied toward the windshield inner surface from the defroster port 12. FIG. On the other hand, most of the warm air flowing into the second passage 32 is supplied from the foot opening 14 toward the feet of the occupant.

-Effect of the embodiment-
In the present embodiment, the following effects are exhibited.

  According to the present embodiment, the bypass passage 50 is formed between the outer edge portion of the rotary door 35 that is in the second state in the heat mode and the inner wall of the casing 3 constituting the second passage 32. The hot air in the air mix space 29 is caused to flow into the first passage via the bypass passage 50.

  Here, the bypass passage 50 is formed in the vicinity of the second passage through which hot air having a relatively high temperature flows. For this reason, the warm air flowing through the bypass passage 50 in the heat mode is higher than the temperature of the warm air located in the space near the cool air passage 20 in the air mix space 29, for example. Therefore, warm air having a relatively high temperature can be introduced into the first passage 31 and blown out from the defroster port 12 to the inner surface of the windshield. Therefore, it is possible to improve the effect of preventing the freezing and frosting of the windshield during the heat mode.

  The bypass passage 50 formed when the rotary door 35 is in the second state is easily formed between the outer edge of the rotary door 35 and the inner wall of the casing 3 constituting the second passage 32. Therefore, there is no need to form a bypass passage, for example, by forming an opening in the rotary door 35 or by providing another switching door. Therefore, freezing and frosting of the windshield in the heat mode can be prevented by a simple device structure. The effect can be improved.

<< Other Embodiments >>
The vehicle air conditioner according to the above embodiment may be configured as follows.

  In the above embodiment, the hot air in the air mix space 29 flows into the first passage 31 from other than the bypass passage 50 in the heat mode by bringing the sealing material 40 of the rotary door 35 into contact with each sealing surface. I try to suppress that. However, as shown by broken lines in FIG. 8, for example, in the rotary door 35 in the first state, convex portions 53 a and convex portions 53 b projecting inward (air passage direction) are formed on the left and right side walls of the casing 3. The seal material 40a is brought into contact with the convex portion 53b, and at the same time, the seal material 40b is brought into contact with the convex portion 53a, thereby preventing leakage of conditioned air from the air mix space 29 to the second passage 32 in the first state. A seal part can be formed.

  Further, for example, in the rotary door 35 that is in the second state, the seal member 40 a and the convex portion 53 a are brought into contact with each other, thereby forming a seal portion that prevents leakage of hot air from the air mix space 29 to the first passage 31. You can also. In this case, the warm air in the air mix space can be more reliably guided to the bypass passage 50, and the temperature of the warm air blown from the defroster port 12 in the heat mode can be further increased.

  Further, as shown in FIG. 9, a bypass passage side convex portion 54 that protrudes inward (air passage direction) is formed above the flange 39 b of the rotary door 35 in the second state, and the flange of the rotary door 35 is formed. By bypassing 39b and the bypass passage side convex portion 54, the bypass passage 50 can be formed. In this case, the rotary door 35 can be positioned reliably and the bypass passage 50 can be formed.

  Further, at this time, as shown in FIG. 10, the sealing material 40b is attached to both surfaces of the flange 39b of the rotary door 35, and the sealing portion is formed by the bypass passage side convex portion 54 and the sealing member 40b. Warm air can be reliably circulated to the bypass passage 50 and allowed to flow into the first passage 31. In this case, the temperature of the warm air flowing to the defroster port 12 can be further increased, and the effect of preventing the freezing and frosting of the windshield in the heat mode can be further improved.

  Further, as shown in FIG. 11 (A), the left and right ends of the protruding plate 52 are formed with protruding grooves 52a protruding inward from the outside of the casing 3, while the sealing members 40b are formed on both surfaces of the flange 39b of the rotary door 35. It can also be pasted. In this case, as shown in FIG. 11 (B) (BB sectional view of FIG. 11 (A)), the inner wall of the protruding groove 52a and the seal member 40b of the rotary door 35 are brought into contact with each other, while FIG. C) As shown in (C-C sectional view in FIG. 11A), a bypass passage 50 is formed between the inner wall of the partition plate 52 located between the projecting grooves 52a and the seal member 40b. Can do. In this embodiment, by contacting the inner wall of the protruding groove 52a and the seal member 40b, the position of the rotary door 35 can be prevented from being displaced due to vibration or the like, and the bypass passage 50 can be reliably formed. it can. At this time, the opening area of the bypass passage 50 can be changed by adjusting the opening width in the left-right direction in both the protruding grooves 52a (adjusting the interval width W between both the groove spaces 52a in FIG. 11A). The amount of warm air flowing from the air mix space 29 to the first passage 31 via the bypass passage 50 can be adjusted.

  Further, as shown in FIG. 12, the opening area of the bypass passage 50 is increased by setting the angle a between the flange 39a and the flange 39b in the rotary door 35 in the above embodiment to an angle a ′ larger than that. In addition, the amount of warm air flowing from the air mix space 29 to the first passage through the bypass passage 50 can be increased.

1 is a schematic configuration diagram of a vehicle air conditioner according to an embodiment of the present invention. It is the perspective view which looked at the rotary door from the outer side of the closing wall part. It is explanatory drawing at the time of the vent mode of the air conditioning apparatus for vehicles which concerns on embodiment. It is explanatory drawing at the time of the defroster mode of the air conditioning apparatus for vehicles which concerns on embodiment. It is explanatory drawing at the time of the differential foot mode of the air conditioning apparatus for vehicles which concerns on embodiment. It is explanatory drawing at the time of the bilevel mode of the air conditioning apparatus for vehicles which concerns on embodiment. It is explanatory drawing at the time of the heat mode of the air conditioning apparatus for vehicles which concerns on embodiment. It is a schematic block diagram of the vehicle air conditioner which concerns on Example 1 of other embodiment. It is a schematic block diagram of the vehicle air conditioner which concerns on Example 2 of other embodiment. It is a schematic block diagram of the vehicle air conditioner which concerns on Example 3 of other embodiment. It is a schematic block diagram of the rotary door vicinity which concerns on Example 4 of other embodiment. It is a schematic block diagram of the rotary door vicinity which concerns on Example 5 of other embodiment.

3 Casing 10 Evaporator (Cooling heat exchanger)
11 Heater core (heat exchanger for heating)
12 Defroster port 13 Vent port 14 Foot port 19 Suction port (Air inlet port)
20 cold air passage 21 hot air passage 29 air mix space 31 first passage 32 second passage 35 rotary door 40 sealing material 50 bypass passage 53 convex portion

Claims (2)

An air passage extending from the air inlet to the air outlet is formed inside the casing in which a plurality of air outlets including an air inlet, a defroster opening, and a foot opening are formed.
The air passage includes a cold air passage in which a cooling heat exchanger is disposed, a hot air passage in which a heating heat exchanger is disposed, and the cold air passage and a downstream end of the hot air passage, respectively. An air mix space that mixes the air that has passed through the air mix space, a first passage that allows the air mix space and the defroster port to communicate with each other, and a space closer to the hot air passage in the air mix space and the foot port. A possible second passage,
The casing includes a first inner wall portion formed along the air mix space and the first passage from a downstream end of the cold air passage, and a second portion formed along the second passage and the first passage. An inner wall and
A temperature control door that opens and closes the downstream end opening of the cold air passage, a first state that is provided in the air mix space and closes the upstream end opening of the second passage, and opens the upstream end opening of the second passage. A rotary door that is displaced between the second state and
Vehicle capable of driving a heat mode in which a part of the warm air heated by the heating heat exchanger is blown out from the foot opening and the remaining warm air heated by the heating heat exchanger is blown out from the defroster opening An air conditioner for use,
In the heat mode, the rotary door that is in the second state has the air mix space and the first passage so that a seal portion is formed in a portion between the air mix space and the first passage in the first inner wall portion. An air conditioner for a vehicle, characterized in that a clearance is formed between the rotary door and the second inner wall so as to allow a flow of air from the second passage to the first passage . The vehicle air conditioner according to claim 1,
The vehicle air conditioner characterized in that the seal portion is composed of a seal material formed on an outer edge portion of the rotary door and a convex portion protruding from the first inner wall portion and coming into contact with the seal portion. apparatus.

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