JP5421937B2 - Air conditioner for vehicles - Google Patents

Description

  Conventionally, a vehicle air conditioner mounted on an engine-driven automobile performs a cooling operation by a heat pump system having a compressor, an indoor heat exchanger, and an outdoor heat exchanger, and uses a waste heat of the engine for a heating operation. Is known to be performed (see, for example, Patent Document 1).

  When this engine-driven vehicle air conditioner is applied to an electric vehicle, the electric vehicle is not equipped with an engine, so that the conventional vehicle air conditioner cannot perform a heating operation.

  Therefore, in a vehicle air conditioner for an electric vehicle, heating operation is performed by dissipating the refrigerant discharged from the compressor in the indoor heat exchanger and absorbing heat in the outdoor heat exchanger.

No. 11-5439 (FIG. 4)

  However, in this heat pump system, the amount of heat released in the indoor heat exchanger is absorbed from the air outside the vehicle compartment in the outdoor heat exchanger during the heating operation. For this reason, when the temperature outside the vehicle compartment becomes a low temperature environment, the evaporation temperature of the refrigerant in the outdoor heat exchanger becomes low, which may cause frost formation on the outdoor heat exchanger, which makes it difficult to control the temperature inside the vehicle interior. Will occur.

  An object of the present invention is to provide an air conditioner for a vehicle in which frost formation hardly occurs in an outdoor heat exchanger even in an environment where the temperature outside the passenger compartment is low in an electric vehicle not equipped with an engine. .

In order to achieve the above object, the present invention provides a compressor that compresses and discharges a first heat exchange medium, and a first radiator that radiates heat from the first heat exchange medium (first indoor radiator 15 in the embodiment). A heat absorber that absorbs the first heat exchange medium (outdoor heat exchanger 22 in the embodiment), a heater that heats the second heat exchange medium, and at least the heater among the heater and the first radiator. A second radiator (first indoor radiator 15 and second indoor radiator 61 in the embodiment) for radiating the heated second heat exchange medium, and the first heat exchange medium discharged by the compressor is the first radiator. The first heat exchange medium radiated in the first radiator and the first heat exchange medium radiated in the first radiator absorbs heat in the heat absorber, and at least the second heat exchange heated by the heater among the heater and the first radiator. A vehicle air conditioner that performs a heating operation in which a medium dissipates heat in a second radiator, and is capable of transferring heat released from the heater to the first heat exchange medium between the heater and the heat absorber. A heat transfer unit (the heat transfer unit 80 in the embodiment) is provided, and the heat transfer unit is disposed on the heater side of the heat absorber, and stores a first heat exchange medium while storing the first heat exchange medium. (2) A heater main body for circulating the heat exchange medium, and the tank and the heater main body are integrally formed .

  As a result, the first heat exchange medium flowing through the heat absorber is heated by the heat released from the heater, so that the temperature outside the vehicle compartment becomes low during the heating operation, and the first heat exchange medium evaporates in the heat absorber. Even if the temperature is lowered and the heat absorber may be frosted, it is possible to prevent the frost from being generated on the heat absorber and to remove the frost attached to the heat absorber.

  In the present invention, “the heat released from the heater can be transferred to the first heat exchange medium” means that the heat released from the heater is directly transferred to the first heat exchange medium or from the heater. This includes the case where the released heat is transferred to the first heat exchange medium via the second heat exchange medium.

In particular, the heat transfer section includes a tank that is disposed on the heater side of the heat absorber and that circulates while storing the first heat exchange medium, and a heater body that circulates the second heat exchange medium in the heater. Since the tank and the heater main body are integrally formed , heat radiated from the second heat exchange medium heated by the heater is transmitted to the first heat exchange medium via the heater main body and the tank. Thus, the first heat exchange medium can be heated. For this reason, the situation which frost formation generate | occur | produces in a heat absorber can be prevented, and the frost which adhered to the heat absorber can be removed. Furthermore, since the tank of the heat transfer unit and the heater main body are integrally formed, the heat transfer unit can be used as a common part of the heater and the heat absorber, and the heat transfer unit is provided in the heater and the heat absorber. The increase in cost can be suppressed.

Further, the heat transfer portion of the present invention is disposed on the heater side of the heat sink and is circulated while storing the first heat exchange medium, and the first flat portion (side portion 22b in the embodiment) is provided on the heater side. A tank and a heater main body provided with a second flat portion (side surface portion 73c in the embodiment) on the heat absorber side through which the second heat exchange medium is circulated in the heater; The first flat surface portion and the second flat surface portion are connected in contact with each other (claim 2 ).

  Thus, the tank and the heater main body can be brought into contact with each other only by providing a flat portion on the existing heater and heat absorber. For this reason, the increase in cost when providing a heat-transfer part in a heater and a heat absorber can be suppressed more.

  Here, the “contacted state” of the present invention refers to a state in which at least a part of the first planar portion and the second planar portion are in contact with each other. Specifically, the first planar portion is in the first heat exchange. Extending in the direction in which the medium flows, the second plane part extending in the direction in which the second heat exchange medium flows, and contacting in a state where the first plane part and the second plane part face each other and extend in the same direction Let

  Further, “coupled” in the present invention means that the tank and the heater main body are coupled in a state where the first planar portion and the second planar portion are in contact with each other. Specifically, an annular retaining ring is attached to the tank and the heater main body, a pair of flanges are provided on the tank and the heater main body, and a fastening member such as a bolt is inserted between these flanges to be fastened.

  According to the vehicle air conditioner of the present invention, by providing a heat transfer unit capable of transferring heat released from the heater to the first heat exchange medium between the heater and the heat absorber, Since the first heat exchange medium flowing through the heat absorber is heated by the released heat, the temperature outside the passenger compartment becomes low during the heating operation, the evaporation temperature of the first heat exchange medium in the heat absorber becomes lower, and the heat absorption Even if there is a risk of frost formation on the heat sink, it is possible to prevent a situation where frost formation occurs on the heat absorber and to remove frost on the heat absorber. For this reason, in an electric vehicle not equipped with an engine, it is possible to provide a vehicle air conditioner in which frost formation hardly occurs in the heat absorber even in an environment where the temperature outside the passenger compartment is low.

It is a schematic block diagram at the time of the heating operation of the air conditioning apparatus for vehicles which shows 1st Embodiment of this invention. It is a schematic side view of the principal part of this vehicle air conditioner. The main part of this vehicle air conditioner is shown. FIG. 3A is a plan view of a retaining ring corresponding to the arrow A in FIG. 2, and FIG. FIG. 3C is a schematic cross-sectional view of the heater main body of the heater corresponding to the CC arrow in FIG. 2. It is a schematic block diagram at the time of dehumidification heating operation of this vehicle air conditioner. It is a schematic side view of the principal part of the vehicle air conditioner of 2nd Embodiment of this invention. The schematic sectional drawing of the principal part of this air conditioning apparatus for vehicles is shown, The figure (a) is a schematic sectional drawing of the heater main-body part of the heater equivalent to the BB arrow of FIG. ) Is a cross-sectional view of the heat transfer section corresponding to the arrow AA in FIG. 5. It is a schematic block diagram at the time of the heating operation of the air conditioning apparatus for vehicles concerning 3rd Embodiment of this invention.

DESCRIPTION OF EMBODIMENTS Hereinafter, a preferred embodiment of a vehicle air conditioner according to the present invention will be described with reference to FIGS. 1 to 4 show a first embodiment of the present invention.

  As shown in FIG. 1, an air conditioner 1 for a vehicle according to the present invention includes an air conditioning unit 10 provided in a vehicle interior, a refrigerant circuit 20 configured over the vehicle interior and the exterior of the vehicle interior, a vehicle interior and a vehicle exterior. And an auxiliary heating circuit 60 configured over the entire area.

  The air conditioning unit 10 has an air flow passage 11 for circulating air supplied into the vehicle interior. On one end side of the air flow passage 11, an outside air intake port 11 a for allowing the air outside the vehicle interior to flow into the air flow passage 11, an inside air intake port 11 b for allowing the air inside the vehicle interior to flow into the air flow passage 11, Is provided. Further, on the other end side of the air flow passage 11, a foot outlet 11 c that blows out air flowing through the air flow passage 11 toward the feet of the passengers in the passenger compartment, and air flowing through the air flow passage 11 are supplied to the vehicle. A vent outlet 11d that blows out toward the upper body of the passenger in the room, and a differential outlet 11e that blows out the air flowing through the air flow passage 11 toward the surface of the vehicle windshield toward the vehicle interior side. ing.

  On one end side of the air flow passage 11, an indoor blower 12 such as a sirocco fan for circulating air from one end side of the air flow passage 11 toward the other end side is provided. This indoor blower 12 is driven by an electric motor 12a.

  On one end side of the air flow passage 11, there is provided an inlet switching damper 13 that can open one of the outside air inlet 11 a and the inside air inlet 11 b and close the other. The suction port switching damper 13 is driven by an electric motor (not shown). When the inside air suction port 11b is closed by the suction port switching damper 13 and the outside air suction port 11a is opened, an outside air supply mode in which air flows from the outside air suction port 11a into the air flow passage 11 is set.

  Further, when the outside air suction port 11a is closed by the suction port switching damper 13 and the inside air suction port 11b is opened, the inside air circulation mode in which air flows from the inside air suction port 11b into the air flow passage 11 is set. Further, when the suction port switching damper 13 is positioned between the outside air suction port 11a and the inside air suction port 11b, and the outside air suction port 11a and the inside air suction port 11b are opened, the outside air suction port 11a by the suction port switching damper 13 is opened. In addition, an outside / inside air suction mode in which air flows into the air flow passage 11 from the outside air inlet 11a and the inside air inlet 11b at a ratio corresponding to the respective opening ratios of the inside air inlet 11b.

  The outlet switching dampers 13b, 13c, and 13d for opening and closing the outlets 11c, 11d, and 11e are provided at the foot outlet 11c, the vent outlet 11d, and the differential outlet 11e on the other end side of the air flow passage 11, respectively. Is provided. These blower outlet switching dampers 13b, 13c, and 13d are configured to be interlocked by a link mechanism (not shown), and are opened and closed by an electric motor, respectively.

  Here, when the foot outlet 11c is opened by the outlet switching dampers 13b, 13c, and 13d, the vent outlet 11d is closed, and the differential outlet 11e is slightly opened, the air flowing through the air flow passage 11 is reduced. Most of the air is blown from the foot outlet 11c and the remaining air is blown from the differential outlet 11e. When the foot outlet 11c and the differential outlet 11e are closed by the outlet switching dampers 13b, 13c, and 13d and the vent outlet 11d is opened, all of the air flowing through the air flow passage 11 is vented 11d. It becomes the vent mode blown out from.

  Further, when the foot outlet 11c and the vent outlet 11d are opened by the outlet switching dampers 13b, 13c, and 13d and the differential outlet 11e is closed, the air flowing through the air flow passage 11 is moved to the foot outlet 11c and the vent. It becomes the bilevel mode which blows off from the blower outlet 11d. When the foot outlet 11c and the vent outlet 11d are closed by the outlet switching dampers 13b, 13c, and 13d and the differential outlet 11e is opened, the air flowing through the air flow passage 11 is blown out from the differential outlet 11e. It becomes the differential mode. When the vent outlet 11d is closed by the outlet switching dampers 13b, 13c, and 13d and the foot outlet 11c and the differential outlet 11e are opened, the air flowing through the air flow passage 11 is transferred to the foot outlet 11c and the differential outlet 11c. It becomes the differential foot mode which blows off from the blower outlet 11e.

  In the bi-level mode, the air flow passage 11 and the foot blowing are such that the temperature difference between the air blown from the foot blower outlet 11c is higher than the temperature of the air blown from the vent blower outlet 11d. The positional relationship and structure of the outlet 11c, the vent outlet 11d, a heat absorber and a radiator described later are provided.

  An indoor heat sink 14 for cooling and dehumidifying the air flowing through the air flow passage 11 is provided in the air flow passage 11 on the downstream side in the air flow direction of the indoor blower 12. A first indoor radiator 15 for heating the air flowing through the air flow passage 11 is provided in the air flow passage 11 downstream of the indoor heat absorber 14 in the air flow direction. The indoor heat absorber 14 and the first indoor radiator 15 are heat exchangers each including a fin and a tube for exchanging heat between the refrigerant and the air flowing through the air flow passage 11.

  In the air flow passage 11 between the indoor heat absorber 14 and the first indoor radiator 15, an air mix damper for adjusting the ratio of the air flowing through the air flow passage 11 to be heated in the first indoor radiator 15. 16 is provided. The air mix damper 16 is driven by an electric motor. Since the air mix damper 16 is positioned upstream of the first indoor radiator 15 in the air flow passage 11, the ratio of the air that exchanges heat in the first indoor radiator 15 is reduced, and the first air flow passage 11 has a first ratio. By moving to a portion other than the indoor radiator 15, the proportion of air that exchanges heat in the first indoor radiator 15 increases.

  The air mix damper 16 has an opening degree of 0% in a state where the upstream side of the first indoor radiator 15 of the air flow passage 11 is closed and a portion other than the first indoor radiator 15 is opened. With the upstream side of the first indoor radiator 15 open and the portion other than the first indoor radiator 15 closed, the opening degree becomes 100%.

  The refrigerant circuit 20 includes the indoor heat absorber 14, the first indoor radiator 15, a compressor 21 for compressing a first heat exchange medium (for example, hydrofluorocarbon), a first heat exchange medium, and air outside the vehicle compartment. An outdoor heat exchanger 22 for exchanging heat, and an internal heat exchanger for exchanging heat between the first heat exchange medium flowing out from the first indoor radiator 15 and the first heat exchange medium flowing out from the indoor heat absorber 14. 23, the electric three-way valve 24 for switching the flow path of the first heat exchange medium, the first to fourth electromagnetic valves 25a to 25d, and the first to second check valves 26a and 26b, the first heat exchange flowing therethrough. First and second expansion valves 27a and 27b for depressurizing the medium, a receiver tank 28 for storing an excess first heat exchange medium, a gas first heat exchange medium and a liquid first heat exchange medium The liquid refrigerant is sucked into the compressor 21 after being separated. It has an accumulator 29 for preventing the door, which are connected by a copper pipe and aluminum pipe.

  The compressor 21 and the outdoor heat exchanger 22 are disposed outside the passenger compartment. The compressor 21 is driven by an electric motor. The outdoor heat exchanger 22 is provided with an outdoor blower 30 for exchanging heat between air outside the vehicle compartment and the first heat exchange medium when the vehicle is stopped. The outdoor blower 30 is disposed closer to the vehicle compartment than the outdoor heat exchanger 22. The outdoor blower 30 is driven by an electric motor 30a.

  Further, the refrigerant discharge side of the compressor 21 and the refrigerant inflow side of the first indoor radiator 15 are connected via the refrigerant flow passage 20a, and the refrigerant outflow side of the first indoor radiator 15 and the refrigerant of the outdoor heat exchanger 22 are connected. The inflow side is connected via the refrigerant flow passage 20b. The refrigerant flow passage 20b is provided with a three-way valve 24. One refrigerant outflow side and the other refrigerant outflow side of the three-way valve 24 are parallel to each other via the refrigerant flow passages 20c and 20d on the refrigerant inflow side of the outdoor heat exchanger 22. Connected.

  In the refrigerant flow passage 20d, a receiver tank 28, a first expansion valve 27a, and a first check valve 26a are provided in order from the upstream side in the refrigerant flow direction. The refrigerant outflow side of the outdoor heat exchanger 22 and the refrigerant intake side of the compressor 21 are connected via a refrigerant flow passage 20e, the refrigerant outflow side of the outdoor heat exchanger 22, and the three-way valve 24 of the refrigerant flow passage 20d The receiver tank 28 is connected to the receiver tank 28 through the refrigerant flow passage 20f.

  The refrigerant flow passage 20e is provided with a first electromagnetic valve 25a and an accumulator 29 in order from the upstream side in the refrigerant flow direction. The refrigerant flow passage 20f is provided with a second electromagnetic valve 25b and a second check valve 26b in order from the upstream side in the refrigerant flow direction. Moreover, between the receiver tank 28 and the 1st expansion valve 27a of the refrigerant | coolant flow path 20d, the high pressure refrigerant | coolant inflow side of the internal heat exchanger 23 is connected via the refrigerant | coolant flow path 20g. A third electromagnetic valve 25c is provided in the refrigerant flow passage 20g.

  The high-pressure refrigerant outflow side of the internal heat exchanger 23 and the refrigerant inflow side of the indoor heat absorber 14 are connected via a refrigerant flow passage 20h. A second expansion valve 27b is provided in the refrigerant flow passage 20h. The indoor heat absorber 14 is connected to the refrigerant outlet side, the low-pressure refrigerant inlet side of the internal heat exchanger 23, and the refrigerant flow passage 20i. The low-pressure refrigerant outflow side of the internal heat exchanger 23 is connected to the first electromagnetic valve 25a and the accumulator 29 in the refrigerant flow passage 20e via the refrigerant flow passage 20j. The refrigerant flow passage 20a and the refrigerant inflow side of the outdoor heat exchanger 22 are connected via the refrigerant flow passage 20k. A fourth electromagnetic valve 25d is provided in the refrigerant flow passage 20k.

  The auxiliary heating circuit 60 heats the second indoor radiator 61 for heating the air flowing through the air flow passage 11 and the second heat exchange medium (for example, water) flowing out from the second indoor radiator 61. The heater 70 is provided. The heater 70 is coupled in contact with a tank 22b (see FIG. 2) provided in the outdoor heat exchanger 22.

  Before describing the heater 70, the outdoor heat exchanger 22 will be described. As shown in FIG. 2, the outdoor heat exchanger 22 has a pair of tanks 22a and 22b provided at both ends in the width direction, and communicates with these tanks 22a and 22b and has a predetermined interval in the vertical direction. A multi-flow type in which the first heat exchange medium flows simultaneously in these tubes 22c, and corrugated fins 22d are joined between the vertically adjacent tubes 22c. Yes.

  The inside of the tank 22a on one side is partitioned by a partition plate 22e, a lower space portion 22f is formed below the tank 22a, and an upper space portion 22g is formed above the tank 22a. A refrigerant inlet 22h is provided in the tank 22a that forms the lower space 22f, and a refrigerant outlet 22i is provided above the tank 22a that forms the upper space 22g.

  Between the lower sides of the pair of tanks 22a and 22b, a plurality of tubes that serve as refrigerant flow paths for flowing the first heat exchange medium flowing into the lower space 22f of the lower tank 22a on the one side into the lower tank 22b. 22j is provided.

  The first heat exchange medium that has flowed into the refrigerant inlet 22h of the outdoor heat exchanger 22 configured as described above flows into the lower space 22f of the tank 22a on one side, and includes a plurality of tubes 22j and the other side. The refrigerant flows through the tank 22b, the numerous tubes 22c, and the tank 22a on one side, and flows out from the refrigerant outlet 22i.

  As shown in FIG. 3B, the tank 22b on the other side is formed of a thermally conductive material (for example, a metal material), and has a curved surface portion 22b1 that is curved on one side in a sectional view, and the other side. And has a side surface portion 22b2 formed in a planar shape, and extends in the vertical direction (a direction orthogonal to the paper surface of FIG. 6). A reservoir 22b3 capable of storing the first heat exchange medium is formed in the tank 22b. The reservoir 22b3 extends from the lower part to the upper part of the tank 22b along the side part 22b2, and communicates with a number of tubes 22c (see FIG. 2). The heater 22 is coupled to the side surface portion 22b2 of the tank 22b in a contact state.

  As shown in FIGS. 2 and 3C, the heater 70 includes a heater 71 having a heating wire, a refrigerant flow path 72 that circulates a second heat exchange medium heated by the heat emitted from the heater 71, and a heater. 71 and a heater main body 73 that forms a refrigerant flow path 72.

  The heater body 73 is formed of a material having thermal conductivity (for example, a metal material), and is provided with a through-hole 73a that penetrates from the upper end to the lower end of the heater body 73. A heater 71 extending in the vertical direction is inserted into the upper end portion and the lower end portion of the through hole 73 a, and the upper and lower end portions of the through hole 73 a are closed by these heaters 71, so that the refrigerant flow into the heater main body 73. A path 72 is formed. A refrigerant flow path 60 b that communicates with the refrigerant flow path 72 is connected to an upper part on one side of the refrigerant flow path 72, and a refrigerant flow path that communicates with the refrigerant flow path 72 at a lower part on one side of the refrigerant flow path 72. 60a is connected. For this reason, the second heat exchange medium flowing through the refrigerant flow path 60b flows into the refrigerant flow path 72 from the upper part of the refrigerant flow path 72, flows to the lower side of the refrigerant flow path, and flows out from the lower part of the refrigerant flow path 72. It flows into the refrigerant flow passage 60a.

  The heater 71 includes a heater portion 71b in which the heating wire 71a is covered with metal, ceramic, or the like, and a base portion 71c that is provided at one end portion in the longitudinal direction of the heater portion 71b and is inserted into the through hole 73a. The surface of the heater part 71b is covered with an insulating material, and the heater part 71b and the heating wire 71a are electrically insulated from the second heat exchange medium.

  When the base portion 71c is inserted into the end portion of the through hole 73a, the heater portion 71b is disposed so as to face the openings 60d and 60e that open to the heater main body 73 side of the refrigerant flow passages 60a and 60b. It is comprised so that. Therefore, the second heat exchange medium flowing through the refrigerant flow passage 60b and flowing into the refrigerant flow path 72 is heated by the heater 71 disposed in the upper part of the through hole 73a and flows downward through the refrigerant flow path 72. It is reheated by the heater 71 disposed below the through hole 73a and flows out toward the refrigerant flow passage 60a.

  The heater main body 73 has a curved surface portion 73b that is curved on the other side in a cross-sectional view and a side surface portion 73c that is formed flat on one side, and is in the vertical direction (a direction orthogonal to the paper surface of FIG. 3). ). The heater main body 73 and the tank 22b described above have substantially the same shape. When the side surface 73c of the heater main body 73 and the side surface 22b2 of the tank 22b are brought into contact with each other, the reservoir 22b3 and the refrigerant flow path 72 are both The heater main body 73 and the outer shape of the tank 22b are formed in a long hole shape in a sectional view. Retaining rings 81 are attached to the upper and lower ends of the heater main body 73 and the tank 22b brought into contact with each other, and the heater main body 73 and the tank 22b are coupled.

  As shown in FIGS. 2 and 3A, the retaining ring 81 is formed of a metal material and can be fitted to the outside of the heater main body 73 and the tank 22b in which the side surface portions are opposed to each other. It is formed in a thin annular shape having a hole portion 81a having

  Thus, since the heater main body 73 has thermal conductivity and is coupled in contact with the tank 22b storing the first heat exchange medium, the second heater heated through the refrigerant flow path 72 is used. The heat of the heat exchange medium and the heat from the heater 70 can be transmitted to the first heat exchange medium stored in the storage portion 22b3 of the tank 22b. Hereinafter, the heater main body 73, the refrigerant flow path 72, the side surface portion 73c, the tank 22b, the storage portion 22b3, and the side surface portion 22b2 are collectively referred to as a heat transfer unit 80.

  Further, the heater main body 73 and the tank 22b can constitute the heat transfer section 80 only by bringing them into contact and fixing with the retaining ring 81. For this reason, the increase in cost in the case of providing a heat transfer part in the heater 70 and the outdoor heat exchanger 22 can be suppressed.

  In the vehicle air conditioner 1 configured as described above, a cooling operation, a dehumidifying and cooling operation, a heating operation, a dehumidifying and heating operation, and a defrosting operation are performed. Table 1 shows the paths of the refrigerant circuits 20 when the operation mode is the cooling operation, the dehumidifying and cooling operation, the heating operation, the dehumidifying and heating operation, and the defrosting operation.

  When the operation mode is the heating operation, the refrigerant circuit 20 is configured such that the flow path of the three-way valve 24 is set on the refrigerant flow path 20d side, the first electromagnetic valve 25a is opened, and the second to fourth electromagnetic valves 25b to 25d are opened. It is closed and the compressor 21 is operated.

  Thereby, the first heat exchange medium discharged from the compressor 21 is, as shown in FIG. 1, the refrigerant flow passage 20a, the first indoor radiator 15, the refrigerant flow passages 20b and 20d, the outdoor heat exchanger 22, and the refrigerant. It flows in the order of the flow passage 20e and is sucked into the compressor 21. The first heat exchange medium flowing through the refrigerant circuit 20 radiates heat in the first indoor radiator 15 and absorbs heat in the outdoor heat exchanger 22.

  At this time, in the air conditioning unit 10, the air flowing through the air flow passage 11 by operating the indoor blower 12 does not exchange heat with the first heat exchange medium in the indoor heat absorber 14, but in the first indoor radiator 15. Heat exchanged with the first heat exchange medium is heated and blown into the passenger compartment.

  In the dehumidifying and heating operation mode, the refrigerant circuit 20 is configured such that the flow path of the three-way valve 24 is set on the refrigerant flow path 20d side, the first and third electromagnetic valves 25a and 25c are opened, and the second and fourth The solenoid valves 25b and 25d are closed, and the compressor 21 is operated.

  Thereby, as shown in FIG. 4, the 1st heat exchange medium discharged from the compressor 21 distribute | circulates the refrigerant | coolant flow path 20a, the 1st indoor radiator 15, and the refrigerant | coolant flow paths 20b and 20d in order. A part of the refrigerant flowing through the refrigerant flow passage 20d flows through the outdoor heat exchanger 22 and the refrigerant flow passage 20e in this order, and is sucked into the compressor 21. The other first heat exchange medium flowing through the refrigerant flow passage 20d includes the refrigerant flow passage 20g, the high pressure side of the internal heat exchanger 23, the refrigerant flow passage 20h, the indoor heat absorber 14, the refrigerant flow passage 20i, and the internal heat exchange. The refrigerant flows in the order of the low pressure side of the compressor 23 and the refrigerant flow passages 20j and 20e and is sucked into the compressor 21. The first heat exchange medium flowing through the refrigerant circuit 20 radiates heat in the first indoor radiator 15 and absorbs heat in the indoor heat absorber 14.

  During this dehumidifying heating operation, the air flowing through the air flow passage 11 by operating the indoor blower 12 in the air conditioning unit 10 is dehumidified by being cooled by exchanging heat with the refrigerant in the indoor heat absorber 14. The air dehumidified in the indoor heat absorber 14 is heated by a part of the air exchanging heat with the first heat exchange medium in the first indoor radiator 15 and blown out into the vehicle interior.

  Here, during the heating operation and the dehumidifying heating, the amount of heat released in the first indoor radiator 15 is absorbed by the outdoor heat exchanger 22 from the air outside the vehicle compartment. For this reason, when the temperature outside the vehicle compartment becomes a low temperature environment, the evaporation temperature of the refrigerant in the outdoor heat exchanger 22 is lowered, and the outdoor heat exchanger 22 may be frosted.

  However, in the vehicle air conditioner 1 of the present invention, as shown in FIG. 2, the heater main body 73 and the tank 22 b in a state where the heater main body 73 of the heater 70 and the tank 22 b of the outdoor heat exchanger 22 are in contact with each other. Are combined. For this reason, the heat released from the heater 70 can be transmitted to the first heat exchange medium stored in the tank 22b. Accordingly, during the heating operation and the dehumidifying heating, the first heat exchange medium that flows through the outdoor heat exchanger 22 by the heat of the second heat exchange medium heated by the heat released from the heater 70 or the heat of the heater 70 is used. Can be heated. Therefore, since the temperature of the outdoor heat exchanger 22 is raised, it is possible to prevent the outdoor heat exchanger 22 from being frosted and to defrost the frost even if the outdoor heat exchanger 22 is frosted. Can do.

  In addition, as shown in FIG. 1, even if the outdoor heat exchanger 22 is frosted and the heat dissipation function of the first indoor radiator 15 is reduced, the air circulation is caused by the heat dissipation in the second indoor radiator 61 of the auxiliary heating circuit 60. Since the air flowing through the path 11 is warmed, the heating function can be prevented from being lowered.

  FIG. 5 shows a second embodiment of the present invention. Note that the same components as those in the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 5 and FIG. 6B, the heater main body 73 and the tank 22b constituting a part of the heat transfer unit 80 are integrally configured. The heater main body 73 is connected to the refrigerant flow passages 60a and 60b, and the tank 22b is connected to the tubes 22j and 22c. That is, the integrally formed heater main body 73 and the tank 22b are connected to the refrigerant flow passages 60a and 60b and the tubes 22j and 22c. As shown in FIG. 6A, heaters 71 are attached to the upper and lower ends of the through hole 73a in the heater main body 73 of the heat transfer unit 80.

  Thus, by integrally configuring the heater main body 73 and the tank 22b, the heat radiated from the second heat exchange medium warmed by the heater 70 is stored through the heater main body 73 and the tank 22b. It is transmitted to the 1st heat exchange medium stored in 22b3, and the 1st heat exchange medium can be heated. For this reason, the situation where frost formation occurs in the outdoor heat exchanger 22 can be prevented, and frost attached to the outdoor heat exchanger 22 can be removed. Furthermore, since the heat transfer unit 80 is formed by integrally forming the tank 22b and the heater main body 73, the heat transfer unit can be used as a common component for the heater 70 and the outdoor heat exchanger 22, and the heater It is possible to suppress an increase in cost when the heat transfer unit is provided in 70 and the outdoor heat exchanger 22.

  FIG. 7 shows a third embodiment of the present invention. Note that the same components as those in the first embodiment described above are denoted by the same reference numerals and description thereof is omitted. As shown in FIG. 7, the vehicle air conditioner 1 of the fourth embodiment includes a first heat exchange medium and a heater 70 that are discharged from the compressor 21 between the auxiliary heating circuit 60 and the refrigerant circuit 20. An internal heat exchanger 63 for exchanging heat with the second heat exchange medium flowing out is provided. In the vehicle air conditioner 1, when frost formation occurs in the outdoor heat exchanger 22, the heat exchange function of the internal heat exchanger 63 is lowered, and the heating capacity of the first indoor radiator 15 is lowered, the heater 70 is heated. Is activated to increase the heating function.

  In the refrigerant circuit 20 shown in FIG. 7, the refrigerant discharge side of the compressor 21 and one refrigerant inflow side of the internal heat exchanger 63 are connected via the refrigerant flow passage 20m, and one refrigerant outflow of the internal heat exchanger 63 occurs. And the refrigerant inflow side of the three-way valve 24 are connected via a refrigerant flow passage 20n. Further, the refrigerant inflow side of the heater 70 and the refrigerant outflow side of the first indoor radiator 15 are connected via the refrigerant flow passage 60b. The refrigerant discharge side of the heater 70 and the other refrigerant inflow side of the internal heat exchanger 63 are connected via the refrigerant flow passage 60a, and the other refrigerant outflow side of the internal heat exchanger 63 and the first indoor radiator 15 are connected. Is connected to the refrigerant inflow side via a refrigerant flow passage 60c. The refrigerant flow passage 60 c is provided with a pump P, and the second heat exchange medium heated by the pump P by the internal heat exchanger 63 and the heater 70 is sent to the first indoor radiator 15.

  In the vehicle air conditioner 1 shown in FIG. 7 configured as described above, when frost formation occurs in the outdoor heat exchanger 22 during the heating operation, the outdoor heat is generated by the heat of the second heat exchange medium heated in the heater 70. The first heat exchange medium flowing through the exchanger 22 is heated. For this reason, the possibility that the heated first heat exchange medium circulates in the outdoor heat exchanger 22 can prevent the outdoor heat exchanger 22 from frosting, and the outdoor heat exchanger 22 can be frosted. It can be removed even if it arrives.

  Further, even if frost formation occurs in the outdoor heat exchanger 22 and the heat exchange function of the internal heat exchanger 63 is lowered, the second heat exchange medium is heated by the heater 70, so that the internal heat exchanger 63 A decrease in the heat exchange function can be compensated, and a decrease in the heating function can be prevented.

  In addition, when frost is generated in the outdoor heat exchanger 22 during the heating operation and the heat exchange function of the internal heat exchanger 63 is almost lost, the second heat exchange medium is heated only by the heater 70.

1 vehicle air conditioner 15 first indoor radiator (first radiator, second radiator)
21 Compressor 22 Outdoor heat exchanger (heat absorber)
22b Tank 22b2 Side surface (first flat surface)
61 Second indoor radiator (second radiator)
63 Internal heat exchanger (first radiator)
70 Heating heater 73 Heater body 73c Side surface (second flat surface)
80 Heat transfer section

Claims (2)

A compressor that compresses and discharges the first heat exchange medium, a first radiator that radiates heat from the first heat exchange medium, a heat absorber that absorbs heat from the first heat exchange medium, and a second heat exchange medium And a second radiator that radiates heat of at least the second heat exchange medium heated by the heater among the heater and the first radiator,
The first heat exchange medium discharged by the compressor is radiated in the first radiator, the first heat exchange medium radiated in the first radiator is absorbed in the heat absorber, and the heater and A vehicle air conditioner that performs a heating operation in which at least the second heat exchange medium heated by the heater in the first radiator is radiated in the second radiator,
Between the heater and the heat absorber, a heat transfer unit capable of transmitting heat released from the heater to the first heat exchange medium is provided ,
The heat transfer section is disposed on the heater side of the heat absorber and distributes the first heat exchange medium while storing it, and a heater main body section that distributes the second heat exchange medium in the heater And the tank and the heater body are integrally formed .   A compressor that compresses and discharges the first heat exchange medium, a first radiator that radiates heat from the first heat exchange medium, a heat absorber that absorbs heat from the first heat exchange medium, and a second heat exchange medium And a second radiator that radiates heat of at least the second heat exchange medium heated by the heater among the heater and the first radiator,
  The first heat exchange medium discharged by the compressor is radiated in the first radiator, the first heat exchange medium radiated in the first radiator is absorbed in the heat absorber, and the heater and A vehicle air conditioner that performs a heating operation in which at least the second heat exchange medium heated by the heater in the first radiator is radiated in the second radiator,
  Between the heater and the heat absorber, a heat transfer unit capable of transmitting heat released from the heater to the first heat exchange medium is provided,
  The heat transfer portion is disposed on the heater side of the heat absorber and flows while storing the first heat exchange medium, and a tank provided with a first flat portion on the heater side, and the tank in the heater A heater main body having a second flat surface portion provided on the heat absorber side through which the second heat exchange medium is circulated, and the tank and the heater main body portion include the first flat portion and the second flat portion. An air conditioner for a vehicle characterized by being connected in contact.