JP2012224112A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner for a vehicle, in which thermal deformation of a resin member used for an air conditioner case etc. due to heat is prevented and a heat exchanger for heating is made small while maintaining heating capacity.SOLUTION: The air conditioner 1 for a vehicle includes: the air conditioner case 5 in which an air flow passage 7 is formed; a fan 10 for sending air to the air flow passage 7; a heat exchanger 20 for cooling which is provided in the air conditioner case 5 and cools the air sent to the air flow passage 7; and a heat exchanger 21 for heating which is provided downstream from the heat exchanger 20 for cooling and heats the air using a heating element. The heat exchanger 21 for heating is constituted by laminating a plurality of units 43a to 43e each of which is composed of the heating element and a heat radiating fin. Curie points of the heating elements of the units 43a and 43e arranged at least at one lamination-direction end of the heat exchanger 21 for heating is lower than those of the heating elements of the other units.

Description

  The present invention relates to a vehicle air conditioner using an electric heater, and more particularly to a vehicle air conditioner that prevents thermal deformation due to heat of a resin member used in an air conditioning case or the like.

  An electric heater having a heat generating element and a heat radiating fin is used as a heater for an air conditioner for a vehicle of an electric vehicle or a hybrid vehicle. Electric heaters have higher thermal efficiency than heaters that use engine cooling water, so the temperature of the air immediately after passing the heater may exceed 150 degrees, such as an air conditioning case made of a thermoplastic resin material, etc. May be thermally deformed by heat.

  As a conventional technique for preventing such a thermal deformation of the resin material, for example, an electric heating heater is installed on the mounting surface of the air conditioning case so that the heating unit is installed away from the air conditioning case surface. A type heater is known (see Patent Document 1).

  In addition, by providing a ventilation path around the heat generating portion of the heat exchanger for heating, it is possible to prevent the temperature rise of the adjacent resin member, specifically, a heat generating portion that generates heat by energization, There is known a vehicle air conditioner in which an electric heater is configured from a case having an opening for holding a heat generating portion, and an air passage is formed around the opening of the case (see Patent Document 2).

JP 2004-322705 A Japanese Utility Model Publication No. 04-83908

  However, in the electric heater of Patent Document 1, since the non-heating member provided to keep the heating unit away from the air conditioning case is provided between the radiating fin and the radiating fin, the installation area of the heating element is reduced. As a result, the maximum heating capacity is reduced, and when the heating capacity is increased, the heating heat exchanger is disadvantageously increased.

  Further, in the vehicle air conditioner disclosed in Patent Document 2, the air passage is provided around the opening of the case of the electric heater, so that the heat exchanger for heating increases as the size of the case increases. There is a disadvantage that becomes large. Further, the wind passing through the air passage flows downstream without being heated without passing through the heat generating portion of the electric heater.

  Moreover, the structure which prevents a thermal deformation | transformation by covering with the member of a thermosetting resin with respect to the member which may have a thermal deformation is also considered.

Specifically, as shown in FIG. 10, a configuration in which a phenol-based or melamine-based thermosetting resin 60 is provided around the air conditioning case 5 adjacent to the heating heat exchanger 21 is conceivable.
In such a case, since it is necessary to secure an installation space for the thermosetting resin 60, the heat exchanger 21 for heating must be made small, and there is a disadvantage that the heating capacity is lowered.

  The present invention has been made in view of the above problems, and is used for an air conditioning case or the like by lowering the air temperature on the side close to the wall surface of the air conditioning case of the air blown downstream of the heat exchanger for heating. The main object of the present invention is to provide a vehicle air conditioner that can prevent thermal deformation due to heat of the resin member and can reduce the size of the heat exchanger for heating while maintaining the heating capacity.

  An air conditioner for a vehicle according to the present invention includes an air conditioning case having an air flow path formed therein, a blower for blowing air to the air flow path, and cooling the air blown to the air flow path to the air conditioning case. A cooling heat exchanger, and a heating heat exchanger that is provided downstream of the cooling heat exchanger and heats the air by a heating element, the heating heat exchanger comprising: a heating element; The heating element of the unit arranged at least one end in the stacking direction of the heating heat exchanger is composed of the heating elements of the other units. It is characterized by being lower than the Curie point it has.

The heating element of the unit arranged at at least one end in the stacking direction of the heating heat exchanger is heated by this unit because it is lower than the Curie point of the heating element of the other unit. By reducing the air temperature on the side close to the wall surface of the air conditioning case of the air blown to the downstream side of the vessel, it is possible to prevent thermal deformation due to heat of the resin member used in the air conditioning case or the like.
Moreover, since the temperature of the air near the wall surface of the air conditioning case can be lowered without increasing the number of components of the heat exchanger for heating, the size of the heat exchanger for heating can be reduced while maintaining the heating capacity. Is possible. That is, before the heating element reaches the Curie point, both the unit disposed at the end and the central unit disposed therebetween can exhibit the heating capacity (heat radiation amount) to the maximum. In particular, when the temperature of the air outside the passenger compartment is extremely low, such as −20 ° C., the temperature of the heating element does not easily reach the Curie point, so that the heating capacity is difficult to be restricted, and the end unit is also located at the center. The unit can also maximize its heating capacity.
In addition, after the heating element reaches the Curie point, the Curie point of the heating element of the unit arranged at the end is low, so that the temperature is lower than other units to prevent thermal deformation of the resin member. it can.

Furthermore, one end of the heating heat exchanger is fixed to the wall surface of the air conditioning case that is not directly exposed to the cooling air blown from the cooling heat exchanger, and the heat generated by the unit disposed on the one end is fixed. You may make an element lower than the Curie point which the heat generating element of another unit has.
As a result, it is not necessary to lower the Curie point of the heating element of the unit arranged at the other end on the side directly exposed to the cooling air. In comparison, the temperature of the air blown downstream of the heating heat exchanger can be increased, and a high heating capacity can be maintained.

  The heating heat exchanger is configured by laminating three or more units each including a heating element and a radiation fin, and the heating elements of the units disposed at both ends in the stacking direction of the heating heat exchanger are: It is desirable that the temperature is lower than the Curie point of the heating elements of other units.

  The heating elements of the units arranged at both ends are lower than the Curie point of the heating elements of other units, so that the wall surface of the air conditioning case to which both ends of the heating heat exchanger are fixed is used for cooling heat exchange. Even when it is not exposed to the cooling air blown from the vessel, it is possible to prevent thermal deformation of the air conditioning case.

  It is desirable that the Curie point of the heating element of the unit arranged at the end of the heating heat exchanger is lower than the melting point of the resin material used for the air conditioning case.

  The temperature of the air near the wall surface of the heated air-conditioning case by the Curie point of the heating element of the unit arranged at the end of the heat exchanger for heating being lower than the melting point of the resin material used for the air-conditioning case Is lower than the melting point of the resin material, so that it is possible to prevent thermal deformation of the air conditioning case.

It is desirable that the unit disposed at the end of the heating heat exchanger is formed to have lower ventilation resistance to the blown air than other units, and is disposed at the end of the heating heat exchanger. It is desirable that the fin fins of the unit have a wider fin pitch than the heat dissipating fins of other units. As a result, even when the temperature of the heating heat exchanger unit rises as the amount of ventilation decreases, the temperature of the unit can be reduced by positively ventilating the unit disposed at the end of the heating heat exchanger. The heating capability can be maintained while being relatively lowered to prevent thermal deformation of the resin member. Moreover, at the normal time when the air flow rate exceeding a predetermined level is maintained, the center part and the end part of the heating heat exchanger unit can exhibit the maximum heating capacity.
In addition, the structure for forming low ventilation resistance may not only widen the fin pitch of the heat dissipating fins but also provide a control door to increase the amount of ventilation to the unit arranged at the end.

  The wide fin pitch of the heat dissipating fins can reduce the ventilation resistance of the unit arranged at the end of the heat exchanger for heating, and the temperature of the unit can be relatively increased by increasing the amount of ventilation. Can be lowered. That is, since the heat generation element does not easily reach the Curie point due to the increase in the air flow rate, the heating capacity is hardly restricted, and as a result, a high heating capacity can be maintained. After reaching the Curie point, the heating capacity is limited, so there is no possibility that the resin member is thermally deformed.

As described above, according to the present invention, the heating element of the unit disposed at at least one end in the stacking direction of the heat exchanger for heating is lower than the Curie point of the heating element of the other unit. It is possible to prevent thermal deformation due to heat of resin members used in air conditioning cases, etc. by lowering the air temperature on the side near the wall surface of the air conditioning case of air that is heated and blown downstream of the heating heat exchanger It becomes.
Moreover, since the temperature of the air near the wall surface of the air conditioning case can be lowered without increasing the number of components of the heat exchanger for heating, the size of the heat exchanger for heating can be reduced while maintaining the heating capacity. Is possible. That is, before the heating element reaches the Curie point, both the end unit and the central unit disposed therebetween can exhibit the heating capacity to the maximum. In particular, when the temperature of the air outside the passenger compartment is extremely low, such as −20 ° C., the temperature of the heating element does not easily reach the Curie point, so that the heating capacity is difficult to be restricted, and the end unit is also located at the center. The unit can also maximize its heating capacity.
In addition, after the heating element reaches the Curie point, the Curie point of the heating element of the unit arranged at the end is low, so that the temperature is lower than other units to prevent thermal deformation of the resin member. it can.

FIG. 1 is a cross-sectional view illustrating the entire vehicle air conditioner according to the first embodiment. FIG. 2A is an exploded perspective view of the heat exchanger for heating according to the first embodiment. (B) is a front view of the heat exchanger for heating concerning Example 1. FIG. FIG. 3 is a circuit diagram showing a connection state of the PTC elements. FIG. 4 is a graph showing a change in air temperature when the blower level of the blower is switched from high to low. FIG. 5 is a cross-sectional view of the entire vehicle air conditioner according to the second embodiment. FIG. 6A is an exploded perspective view of the heating heat exchanger according to the third embodiment. (B) is a front view of the heat exchanger for heating concerning Example 3. FIG. FIG. 7 is a cross-sectional view showing the entire vehicle air conditioner when a control door is provided upstream of the heat exchanger for heating. FIG. 8 is a cross-sectional view showing the entire vehicle air conditioner when the control door provided upstream of the heating heat exchanger is changed. FIG. 9 is a cross-sectional view illustrating the entire vehicle air conditioner according to the fifth embodiment. FIG. 10 is a cross-sectional view showing an entire vehicle air conditioner in which a thermosetting resin is provided in an air conditioning case near the heat exchanger for heating.

  The vehicle air conditioner of the present invention will be described below with reference to the drawings.

  The vehicle air conditioner 1 shown in FIG. 1 includes an intake part 2, a heat exchange part 3, and an outlet selection part 4, and an air flow path 7 for allowing air to pass through the parts 2, 3, and 4 is provided. Is formed. The intake portion 2 is a portion that takes air into an air conditioning case 5 formed of a thermoplastic resin such as polypropylene. The heat exchange unit 3 is a part that adjusts the air taken in from the intake unit 2 to a set temperature or humidity. The blower outlet selection part 4 is a part for making the conditioned air adjusted by the heat exchange part 3 blow out selectively from the several blower outlet provided in the vehicle interior.

The intake section 2 can appropriately select an outside air inlet 11 that opens to allow air outside the passenger compartment to be inhaled, an inside air inlet 12 that opens to allow air inside the passenger compartment to be inhaled, and an outside air inlet 11 and an inside air inlet 12. It has an inside / outside air switching door 13 that is in operation, and air that is selectively introduced by the inside / outside air switching door 13 is blown to the air flow path 7 by a blower 10 having a centrifugal multiblade fan driven by a blower motor. . The intake unit 2 is configured to be supplied with a drive current from the in-vehicle battery and connected to an electronic control unit (ECU) (not shown) to control the blower 10 and the inside / outside air switching door 13.
The control of the introduction ratio between the outside air and the inside air is adjusted by the inside / outside air switching door 13 driven by the actuator 14, and the operation of the actuator 14 is controlled by the ECU. The ECU performs various information processing necessary for the air conditioner, outputs control signals to the components, and the like in cooperation with hardware such as a CPU, ROM, and RAM and predetermined program software.

The heat exchange unit 3 includes a cooling heat exchanger 20, a heating heat exchanger 21, and an air mix door 22.
The cooling heat exchanger 20 uses a corrugated fin in a well-known refrigeration cycle, and is a heat exchanger into which the refrigerant after decompression flows, and heat-exchanges air taken into the air-conditioning case 5 from the intake section 2. And cool.

  As shown in FIG. 2, the heating heat exchanger 21 is an electric heating heat exchanger that heats air that has passed through the cooling heat exchanger 20, and the heating element 40 and the stacking direction of the heating elements 40 One unit 43 is constituted by the radiation fins 41 disposed on both sides of the substrate, and an electrode plate (not shown) disposed between one surface in the stacking direction of the heating elements 40 and the radiation fins 41, Five units 43 are sequentially stacked, and one end is fixed to the wall surface 50 of the air conditioning case 5.

  The unit 43 is held at the outer periphery by the upper end plate 15 from the lower direction, the lower end plate 8 from the lower direction, the front housing 9 from the left direction, and the end housing 6 from the right direction, and heat exchange for heating. The entire vessel 21 is held in the air conditioning case 5 from the longitudinal direction of the unit 43.

  The upper end plate 15 is provided with an electrical connector 15a, and the heat generating element 40 is electrically connected to an external power source. The lower end plate 8 is formed with a groove 8 a into which the end of the heating element 40 is inserted.

The heating element 40 is formed by inserting a plurality of PTC elements (positive thermistors) into a resin frame formed of a heat-resistant resin material (for example, 66 nylon, polybutadiene terephthalate, etc.) or integrally molding them. It is configured.
As shown in FIG. 3, one end of each of the five PTC elements 40a, 40b, 40c, 40d, and 40e corresponding to each heating element 40 is connected to the electrical connector 15a, and the other end is connected to the ground. Further, when electric power is supplied from the electrical connector 15a, the temperature of each PTC element rises, and when the temperature rises to a predetermined temperature, the resistance value rapidly rises so that current does not flow easily and the temperature becomes constant. Has been. Hereinafter, the temperature at which the resistance value rapidly increases and the current hardly flows is called the Curie point.

  Here, the PTC elements 40a and 40e used for the heating elements 40 of the two units 43 (hereinafter referred to as end units 43a and 43e) provided near both the front housing 9 and the end housing 6 in the stacking direction, and their The PTC elements 40b, 40c, and 40d used for the heating elements 40 of the three units 43 (hereinafter referred to as central units 43b, 43c, and 43d) provided between them are configured with different Curie points. .

  Specifically, the PTC elements 40a and 40e have a Curie point of about 130 ° C. lower than the melting point (125 to 160 ° C.) when the air conditioning case 5 is made of polypropylene as described above. On the other hand, the PTC elements 40b, 40c, and 40d have a Curie point of 170 ° C.

  That is, as shown in FIG. 4, when a constant voltage of 100 V is applied to the heating heat exchanger, the PTC elements 40a and 40e having a low Curie point are heated to about 130 ° C. and are end units having these PTC elements. The air that has passed through 43a and 43e rises to about 103 ° C. On the other hand, the PTC elements 40b, 40c, 40d having a high Curie point are heated to about 170 ° C., and the air that has passed through the central units 43b, 43c, 43d having these PTC elements rises to about 150 ° C. The temperature indicated by the curve on the graph indicates the Curie point of the PTC element.

  The amount of air flowing into the outlet selection unit 4 is adjusted by the air mix door 22 driven by the actuator 23, and conditioned air having a set temperature is generated by this adjustment. The operation of the actuator 23 is controlled by the ECU.

  The outlet selection unit 4 includes a vent communication port 25, a foot communication port 26, a defrost communication port 27, a vent door 30, a foot door 31, and a defrost door 32. The vent communication port 25 is an opening that communicates with a vent outlet provided through the duct so as to be blown toward the passenger's upper body in the passenger compartment, and the vent door 30 opens or closes or adjusts the opening. The The foot communication port 26 is an opening that communicates with a foot outlet provided through the duct so as to be blown toward the feet of the occupant in the passenger compartment. The foot door 31 opens or closes or adjusts the opening. The The defrost communication port 27 is an opening that communicates via a duct with a defrost outlet that is provided so as to blow air toward the windshield in the vehicle interior. The The vent door 30, the foot door 31, and the defrost door 32 are driven by actuators 35, 36, and 37, respectively. These actuators 35, 36, and 37 are controlled by the ECU. The door 30, 31, 32 blows conditioned air from a desired outlet. In addition, the formation positions of the communication ports 25, 26, and 27 described above, the structures of the doors 30, 31, and 32 are examples, and various other configurations can be employed.

  As described above, the vehicle air conditioner 1 has the end units 43a, 43e because the heating elements 40 of the end units 43a, 43e are lower than the Curie point of the heating units 40 of the central units 43b, 43c, 43d and lower than the melting point of polypropylene. The air that has passed through the unit units 43a and 43e can be made below the melting point of polypropylene, and thermal deformation of the air conditioning case 5 can be prevented. Moreover, since the temperature of the air near the wall surface of the air conditioning case 5 that has passed through the heating heat exchanger 21 can be lowered without increasing the number of components of the heating heat exchanger 21, the heating capacity is maintained. However, it is possible to reduce the size of the heating heat exchanger 21.

In the above-described configuration, the end units 43a and 43e of the heating exchanger 21 are configured by providing the PTC elements 40a and 40e having a low Curie point, but the wall surface 50 of the air conditioning case 5 is the cooling heat exchanger 20. When the cooling air is exposed to the cooling air, a sufficient cooling effect can be obtained, so that the heating heat is applied to the wall surface 51 of the air conditioning case 5 that is not directly exposed to the cooling air of the cooling heat exchanger 20. One end of the exchanger 21 is fixed, and only the heating element 40 of the end unit 43e arranged at the one end is set lower than the Curie point of the heating elements 40 of the other units 43a to 43d. As a result, the Curie point of the heat generating element 40 of the end unit 43a on the side exposed to the cooling air does not have to be lowered, so the curie of the heat generating element 40 of the units 43a and 43e on both ends is sufficient. Compared with the case where a point is made low, the temperature of the air sent downstream of the heat exchanger 21 for heating can be made high, and a high heating capability can be maintained.

  In the above-described embodiment, the heating heat exchanger 21 is configured by the five units 43, but the heating heat exchanger 21 may be configured by the two units 43. Hereinafter, with respect to the configuration of the vehicle air conditioner, the same parts as those of the vehicle air conditioner are denoted by the same reference numerals and description thereof is omitted.

  Specifically, as shown in FIG. 5, the heat exchanger 21 for heating is configured to include two units 43, which are a unit 43a and a unit 43b. The unit 43b provided on the wall surface 50 side exposed to the cooling air from the cooling heat exchanger 20 is configured to have the PTC element 40b having a high Curie point, and is not affected by the cooling air. The unit 43a provided in the configuration includes a PTC element 40a having a low Curie point.

  Thus, by comprising the heat exchanger 21 for heating with the two units 43, while being able to provide the heat exchanger 21 for heating in the limited space, the thermal deformation of the air-conditioning case 5 can also be prevented. It becomes possible.

  In the above-described embodiment, the vehicle air conditioner in which the ventilation resistance of all the units 43 is the same in the heating heat exchanger 21 has been described. However, the heating element 40 of the unit 43 generates heat when the ventilation rate decreases. In particular, the temperature rises due to a decrease in the medium that transmits heat. Therefore, for example, in the heat exchanger 21 for heating shown in the first embodiment, when the ventilation rate is further reduced, the ventilation rate of the end units 43a and 43e provided near the wall surface of the air conditioning case 5 is increased. It may be configured to prevent thermal deformation.

  Specifically, as shown in FIG. 7, the control door 70 that controls the air volume flowing into the end units 43a and 43e close to the air conditioning case of the heat exchanger 21 for heating and the actuator 71 that drives the control door 70 are heated. It is provided on the upstream side of the industrial heat exchanger 21. And when the whole ventilation volume reduces, the control door 70 is operated so that the ventilation volume to central unit 43b, 43c, 43d may be decreased, and it is to the edge unit 43a, 43e near the wall surface of the air-conditioning case 5. The air temperature can be more reliably lowered and the thermal deformation of the air conditioning case 5 can be prevented.

Further, as shown in the second embodiment, when the heating heat exchanger 21 is configured by two units 43 and each unit 43 can be individually controlled in operation, the air flow rate of the units 43 that are not operating May be configured to further increase the air flow rate of the unit 43 that is operating.
Specifically, as shown in FIG. 8, a control door 72 formed so as to be able to adjust the air flow rate to the units 43 a and 43 b and an actuator 73 that drives the control door 72 are disposed upstream of the heat exchanger 21 for heating. Is provided.

  Then, when the overall ventilation rate decreases, the operation of any of the two units 43 may be stopped. For example, the control door 72 is set so as to stop the operation of the unit 43b and reduce the ventilation rate. By operating and increasing the amount of air flow to the end unit 43a on the side close to the wall surface of the air conditioning case 5, the air temperature can be more reliably lowered and thermal deformation of the air conditioning case 5 can be prevented.

  In the two configurations shown in the third embodiment, a link mechanism for controlling the control doors 70 and 72 is required, but the control doors 70 and 72 and the like are formed by reducing the ventilation resistance of the end units 43a and 43e. Without providing, it is also possible to lower the temperature of the air after passing through the end units 43a and 43e.

Specifically, as shown in FIG. 6, the end units 43 a and 43 e are formed so that the fin pitch of the radiating fins 41 is wider than the fin pitch of the central units 43 b, 43 c and 43 d.
Thus, the ventilation resistance of the end units 43a and 43e can be reduced by forming the fin pitch of the radiating fins 41 of the end units 43a and 43e wider than the fin pitch of the central units 43b, 43c and 43d. The temperature of the end units 43a and 43e can be relatively lowered by increasing the air flow rate. That is, since the heat generating element 40 does not easily reach the Curie point due to the increase in the air flow rate, the heating capacity is hardly restricted, and as a result, the high heating capacity can be maintained. Further, after reaching the Curie point, the heating capacity is limited, so that it is possible to prevent thermal deformation of the air conditioning case 5.

  In the above-described embodiment, the air conditioning case 5 is configured to adjust the air amount flowing into the outlet selection unit 4 and the temperature of the conditioned air by the air mix door 22, but these are not provided without the air mix door 22. The air conditioning case 5 may be configured to adjust.

  Specifically, as shown in FIG. 9, the heat exchanger 21 for heating is provided so as to block the air flow path 7 from the bottom surface 53 to the top surface 52 of the air conditioning case 5. The temperature of the conditioned air is adjusted by heating the cooling air blown from the cooling heat exchanger 20 to a desired temperature with the heating heat exchanger 21.

The heating heat exchanger 21 includes five units 43, and the Curie points of the PTC elements 40a and 40e of the end units 43a and 43e provided on the upper surface 52 side and the bottom surface 53 side of the air conditioning case 5 are the other units 43b. , 43c, and 43d are used.
Further, the temperature control of the heating heat exchanger 21 is performed by controlling the voltage applied to the unit 43. Specifically, the duty ratio is determined by the ratio (modulation factor) between the command voltage and the detected DC voltage value. This is performed by PWM control for controlling the supply voltage to the unit 43.

In the air conditioning case 5 of the present embodiment, the cooling air blown from the cooling heat exchanger 20 is not actively exposed to the upper surface 52 and the bottom surface 53, and therefore the Curie points of the end units 43a and 43e are low. By using the thing, it becomes possible to prevent thermal deformation of the air conditioning case.
Further, by configuring the air conditioning case 5 so as to adjust the conditioned air without using the mix door, it is possible to reduce the size of the vehicle air conditioner 1 and reduce the number of parts.
In the present embodiment, the end units 43a and 43e have been described as having a Curie point lower than other units. However, as shown in the third embodiment, even if the unit has a reduced ventilation resistance. Good.

DESCRIPTION OF SYMBOLS 1 Vehicle air conditioner 5 Air conditioning case 7 Air flow path 10 Blower 20 Heat exchanger for cooling 21 Heat exchanger for heating 40 Heating element 41 Radiation fin 43 Unit 43a, 43e End unit

Claims (6)

An air conditioning case in which an air flow path is formed, a blower that blows air to the air flow path, a cooling heat exchanger that cools the air blown to the air flow path in the air conditioning case, A heating heat exchanger that is provided on the downstream side of the cooling heat exchanger and heats the air by a heating element,
The heating heat exchanger is configured by laminating a plurality of units each including a heating element and a radiation fin,
The vehicle air conditioner characterized in that a heating element of a unit disposed at at least one end of the heating heat exchanger in the stacking direction is lower than a Curie point of a heating element of another unit. One end of the heating heat exchanger is fixed to the wall surface of the air conditioning case that is not directly exposed to the cooling air blown from the cooling heat exchanger,
2. The vehicle air conditioner according to claim 1, wherein a heating element of a unit arranged at the one end is lower than a Curie point of a heating element of another unit. The heating heat exchanger is configured by laminating three or more units each including a heating element and a radiation fin,
2. The vehicle air conditioner according to claim 1, wherein the heating elements of the units disposed at both ends of the heating heat exchanger in the stacking direction are lower than the Curie point of the heating elements of the other units. .   4. The Curie point of the heating element of the unit disposed at the end of the heating heat exchanger is lower than the melting point of the resin material used for the air conditioning case. A vehicle air conditioner according to claim 1.   The vehicle unit according to any one of claims 1 to 4, wherein the unit disposed at the end portion of the heat exchanger for heating is formed with lower ventilation resistance to blown air than other units. Air conditioner   6. The vehicle air conditioner according to claim 5, wherein the heat dissipating fins of the units arranged at the end of the heating heat exchanger have a fin pitch wider than the heat dissipating fins of the other units.

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