JP2016037062A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly drain water, by preventing freezing of water caused by defrosting.SOLUTION: An air conditioner 10 for a vehicle comprises an outdoor heat exchanger 24 arranged above a vehicle lower part (for example, a bumper and the like) provided with a drain hole. An inlet pipe connected to the outdoor heat exchanger 24 is arranged in the vicinity of the drain hole of the vehicle lower part. A high temperature and high pressure refrigerant introduced to the outdoor heat exchanger 24 from the inlet pipe in defrosting operation of the air conditioner 10 for the vehicle, defrosts the outdoor heat exchanger 24 by radiating heat to the cabin outer atmosphere. A water droplet by a condensate produced in the outdoor heat exchanger 24 drips in the vehicle lower part under the outdoor heat exchanger 24, and is accumulated on the periphery of the drain hole, and is drained to the outside from the drain hole. The refrigerant in the inlet pipe heats the periphery of the drain hole, and prevents freezing of the water accumulated on the periphery of the drain hole.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle air conditioner.

  Conventionally, a tube forming a refrigerant passage, a fin fixed to the tube, a side plate fixed to the fin, a base provided below the side plate, and a drainage that closes a gap between the side plate and the base. There is a heat exchanger provided with a guide (for example, refer to patent documents 1). The side plate includes a through hole and a notch for dripping condensed water generated in the heat exchanger onto the drainage guide. The drainage guide prevents air from flowing through the gap between the side plate and the base, and drains condensed water from the side plate to the outside such as the base.

International Publication No. 2013/051418

  By the way, since the heat pump using the heat exchanger according to the related art absorbs heat from the outdoor atmosphere by evaporating the refrigerant by the outdoor heat exchanger, frost may be generated in the outdoor heat exchanger. When the defrosting operation for melting the frost of the outdoor heat exchanger is executed, if the drainage of the water droplets due to the melted frost is insufficient, the water that has accumulated water droplets may be re-frozen. When generation of water droplets due to defrosting and re-freezing of accumulated water due to water droplets are repeated, ice blocks may be formed on the drainage path such as the base.

  This invention is made | formed in view of the said situation, and it aims at providing the vehicle air conditioner which can prevent freezing of the water which arises by a defrost, and can perform appropriate drainage.

In order to solve the above problems and achieve the object, the present invention employs the following aspects.
(1) A vehicle air conditioner according to an aspect of the present invention includes a compressor that compresses a refrigerant (for example, the compressor 21 in the embodiment) and an indoor heat exchanger that performs heat exchange between the refrigerant and the vehicle interior atmosphere ( For example, the evaporator 14 and the indoor condenser 16) in the embodiment, the outdoor heat exchanger (for example, the outdoor heat exchanger 24 in the embodiment) for exchanging heat between the refrigerant and the atmosphere outside the vehicle, and the refrigerant A control device (for example, the control device 18 in the embodiment) that performs cooling and heating by circulating in the circulation flow path that passes through the compressor, the indoor heat exchanger, and the outdoor heat exchanger. A vehicle air conditioner, in which a drain hole (for example, drain hole 51 in the embodiment) is provided below the outdoor heat exchanger (for example, a vehicle in the embodiment) Comprises a part 52), wherein the pipe of the refrigerant is disposed in the vicinity of the drain hole (e.g., the inlet pipe 45 in the embodiment), the.

(2) A vehicle air conditioner according to an aspect of the present invention includes a compressor that compresses a refrigerant (for example, the compressor 21 in the embodiment) and an indoor heat exchanger that performs heat exchange between the refrigerant and the vehicle interior atmosphere ( For example, the evaporator 14 and the indoor condenser 16) in the embodiment, the outdoor heat exchanger (for example, the outdoor heat exchanger 24 in the embodiment) for exchanging heat between the refrigerant and the atmosphere outside the vehicle, and the refrigerant A control device (for example, the control device 18 in the embodiment) that performs cooling and heating by circulating in the circulation flow path that passes through the compressor, the indoor heat exchanger, and the outdoor heat exchanger. An air conditioner for a vehicle, wherein a drain hole (for example, implementation) is provided in the vicinity of a header (for example, the header 41 in the embodiment) that forms a refrigerant passage of the outdoor heat exchanger. Comprising a vehicle bottom drainage holes 51 in the state) is provided (e.g., a vehicle underbody 52) in an embodiment, a.

(3) In the vehicle air conditioner described in (2) above, the lower part of the vehicle is a receiving part (for example, the receiving part 53 in the embodiment) that covers the lower part of the header (for example, the lower part 41b in the embodiment). Is provided.

(4) In the vehicle air conditioner according to any one of (1) to (3) above, the lower part of the vehicle is a bumper.

  According to the vehicle air conditioner pertaining to the aspect described in (1) above, by providing the refrigerant pipe arranged in the vicinity of the drain hole, the refrigerant accumulated in the vicinity of the drain hole due to the temperature of the refrigerant flowing in the pipe. Water can be prevented from freezing.

  According to the vehicle air conditioner according to the aspect described in (2) above, the vehicle lower portion provided with the drainage hole in the vicinity of the header is provided, so that it accumulates in the vicinity of the drainage hole due to the temperature of the refrigerant flowing in the header. Water can be prevented from freezing.

  Furthermore, in the case of the above (3), since the receiving part which covers the lower part of a header is provided, it can prevent that water accumulates in parts other than a receiving part. By providing the drain hole in the receiving part, it is possible to suppress the air from passing through the drain hole and to prevent the cooling performance of the heat exchanger and the aerodynamic characteristics of the vehicle from being deteriorated.

  Furthermore, in the case of (4) above, it is possible to prevent water accumulated in the bumper from freezing.

1 is a configuration diagram of a vehicle air conditioner according to a first embodiment of the present invention. It is sectional drawing which shows the structure of a part of outdoor heat exchanger of the vehicle air conditioner which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows a partial structure of the inlet piping of the outdoor heat exchanger of the vehicle air conditioner which concerns on the 1st Embodiment of this invention, and the vehicle lower part which has a drain hole. It is a figure which shows the operation | movement at the time of the heating operation of the vehicle air conditioner which concerns on the 1st Embodiment of this invention. It is a figure which shows the operation | movement at the time of air_conditionaing | cooling operation of the vehicle air conditioner which concerns on the 1st Embodiment of this invention. It is a figure which shows the operation | movement at the time of the hot gas driving | operation of the vehicle air conditioner which concerns on the 1st Embodiment of this invention. It is a figure which shows the operation | movement at the time of reverse rotation defrost driving | operation of the vehicle air conditioner which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows a part of structure of the outdoor heat exchanger of the vehicle air conditioner which concerns on the modification of the 1st Embodiment of this invention. It is sectional drawing which shows the structure of a part of header of the outdoor heat exchanger of the vehicle air conditioner which concerns on the 2nd Embodiment of this invention, and the vehicle lower part which has a drain hole.

  Hereinafter, a vehicle air conditioner according to an embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
As shown in FIG. 1, the vehicle air conditioner 10 of the first embodiment is provided on the downstream side with an air introduction port 11 a provided on the upstream side of a ventilation duct 11 mounted on a vehicle (not shown). And an air outlet 11b. The vehicle air conditioner 10 includes an inlet opening / closing door 12, a blower 13, an evaporator 14, a damper 15, and an indoor capacitor 16 sequentially from the air inlet 11a toward the air outlet 11b.
The vehicle air conditioner 10 includes a heat pump cycle 17 including an evaporator 14 and an indoor side capacitor 16, and a control device 18.

The air introduction port 11 a of the ventilation duct 11 introduces inside air (vehicle compartment air) and outside air (vehicle compartment outside air) into the vehicle air conditioner 10. The air outlet 11b blows air from the inside of the vehicle air conditioner 10 into the vehicle interior.
The inlet opening / closing door 12 adjusts the introduction amount of the inside air (vehicle compartment air) and the outside air (vehicle compartment outside air) into the ventilation duct 11 according to the opening / closing amount controlled by the control device 18.

The blower 13 is driven in accordance with the control of the control device 18 and blows air introduced from the air introduction port 11 a into the ventilation duct 11 toward the evaporator 14 and the indoor condenser 16.
The evaporator 14 performs heat exchange between the low-pressure refrigerant flowing into the evaporator 14 and the air passing through the evaporator 14 in the ventilation duct 11. The evaporator 14 cools the air passing through the evaporator 14 inside the ventilation duct 11 by, for example, heat absorption when the refrigerant evaporates.

The damper 15 adjusts the air volume ratio between the air volume introduced into the indoor condenser 16 and the air volume bypassing the indoor condenser 16 and discharged into the vehicle interior according to the opening controlled by the control device 18. For example, the damper 15 distributes the air that has passed through the evaporator 14 to the ventilation path toward the indoor condenser 16 or the ventilation path that bypasses the indoor condenser 16 depending on the opening degree with respect to the ventilation path toward the indoor condenser 16.
The indoor condenser 16 exchanges heat between the high-temperature and high-pressure refrigerant flowing into the indoor condenser 16 and the air passing through the indoor condenser 16 inside the ventilation duct 11. The indoor condenser 16 heats the air passing through the indoor condenser 16 inside the ventilation duct 11, for example.

  The heat pump cycle 17 includes a compressor 21, an evaporator 14, an indoor condenser 16, a heating expansion valve 22, a cooling electromagnetic valve 23, an outdoor heat exchanger 24, a three-way valve 25, and a gas-liquid separator 26. And an electronic expansion valve 27. The heat pump cycle 17 performs cooling and heating by circulating the refrigerant in the refrigerant flow path 31 that passes through at least the compressor 21, the evaporator 14 or the indoor condenser 16, and the outdoor heat exchanger 24.

The compressor 21 is driven according to the control of the control device 18, sucks gas-phase refrigerant from the gas-liquid separator 26, and compresses this refrigerant. The compressor 21 discharges a high-temperature and high-pressure refrigerant to the indoor condenser 16.
The indoor side capacitor 16 is connected to the outdoor heat exchanger 24 by the refrigerant flow path 31. The heating expansion valve 22 and the cooling electromagnetic valve 23 are disposed between the indoor condenser 16 and the outdoor heat exchanger 24 in the refrigerant flow path 31.
The heating expansion valve (heating throttle valve) 22 expands the refrigerant discharged from the indoor condenser 16. The heating expansion valve 22 discharges a low-temperature and low-pressure atomized refrigerant to the outdoor heat exchanger 24.

The cooling electromagnetic valve 23 opens and closes under the control of the control device 18. The cooling electromagnetic valve 23 is provided in a bypass flow path 32 that bypasses the heating expansion valve 22 in the refrigerant flow path 31. The bypass flow path 32 is connected to the first branch pipe 32a on the indoor condenser 16 side and the second branch pipe 32b on the outdoor heat exchanger 24 side. The cooling electromagnetic valve 23 is closed when the heating operation or the dehumidifying heating operation is performed, and is opened when the cooling operation is performed.
That is, during the heating operation or the dehumidifying heating operation, the refrigerant discharged from the indoor condenser 16 passes through the heating expansion valve 22 and flows into the outdoor heat exchanger 24 in a low temperature and low pressure state.
On the other hand, when performing the cooling operation, the refrigerant discharged from the indoor condenser 16 passes through the cooling electromagnetic valve 23 and flows into the outdoor heat exchanger 24 in a high temperature state.

The outdoor heat exchanger 24 is a condenser on the outdoor side, and performs heat exchange between the refrigerant flowing into the outdoor heat exchanger 24 and the atmosphere outside the vehicle interior.
When the heating operation or the dehumidifying heating operation is performed, the outdoor heat exchanger 24 absorbs heat from the outdoor atmosphere by the low-temperature and low-pressure refrigerant flowing into the outdoor heat exchanger 24. The outdoor heat exchanger 24 raises the temperature of the refrigerant by absorbing heat from the atmosphere outside the passenger compartment.
The outdoor heat exchanger 24 radiates heat to the vehicle exterior atmosphere by the high-temperature refrigerant flowing into the outdoor heat exchanger 24 during the cooling operation. The outdoor heat exchanger 24 cools the refrigerant by radiating heat to the vehicle exterior atmosphere and blowing air from the condenser fan 24a.

As shown in FIGS. 2 and 3, the outdoor heat exchanger 24 includes a pair of headers 41, a plurality of tubes 42 and fins 43, and a plurality of partition members 44.
The pair of headers 41 are two tubular members arranged in parallel. The pair of headers 41 includes an inlet part 41a to which the inlet pipe 45 is connected and an outlet part (not shown) to which the outlet pipe (not shown) is connected.
The plurality of tubes 42 and fins 43 are arranged between the pair of headers 41 and are alternately arranged in the direction in which each header 41 extends. Each of the plurality of tubes 42 forms a refrigerant passage by connecting a pair of headers 41.
The plurality of partition members 44 are provided inside the pair of headers 41. Each partition member 44 partitions the inside of each header 41 into a plurality of sections S in the direction in which each header 41 extends. The partition member 44 provided on one side of the pair of headers 41 and the partition member 44 provided on the other side are arranged at alternate positions in the direction in which each header 41 extends. Thereby, between the pair of headers 41, a refrigerant passage is formed by the plurality of tubes 42 so as to be alternately folded at the sections S of the headers 41.

The outdoor heat exchanger 24 is disposed above a lower part (for example, a bumper) 52 where a drain hole 51 is provided. Thereby, water droplets such as condensed water generated in the outdoor heat exchanger 24 during the defrosting operation to be described later are dropped from the header 41 of the outdoor heat exchanger 24 onto the vehicle lower part 52 and then drained to the outside from the drain hole 51. .
An inlet pipe 45 connected to the outdoor heat exchanger 24 is disposed in the vicinity of the drain hole 51 in the vehicle lower part 52. Of the inlet pipe 45, a portion disposed in the vicinity of the drain hole 51 is, for example, a portion upstream of the heating expansion valve 22, that is, a portion closer to the compressor 21 than the heating expansion valve 22.

The three-way valve 25 switches the refrigerant flowing out of the outdoor heat exchanger 24 to the gas-liquid separator 26 or the electronic expansion valve 27 and discharges it under the control of the control device 18. The three-way valve 25 is connected to the outdoor heat exchanger 24, the merge pipe 33 on the gas-liquid separator 26 side, and the electronic expansion valve 27.
When the heating operation or the dehumidifying heating operation is performed, the three-way valve 25 discharges the refrigerant flowing out from the outdoor heat exchanger 24 to the inlet (not shown) of the merging pipe 33 on the gas-liquid separator 26 side.
The three-way valve 25 discharges the refrigerant flowing out of the outdoor heat exchanger 24 to the electronic expansion valve 27 during the cooling operation.

The gas-liquid separator 26 is connected between the outlet (not shown) of the merging pipe 33 and the inlet (not shown) of the compressor 21. The gas-liquid separator 26 separates the gas-liquid refrigerant flowing out from the outlet of the junction pipe 33 and causes the compressor 21 to suck in the gas-phase refrigerant.
The electronic expansion valve 27 is connected between the three-way valve 25 and the inlet (not shown) of the evaporator 14. The electronic expansion valve 27 expands the refrigerant flowing into the electronic expansion valve 27 in accordance with the valve opening controlled by the control device 18. The electronic expansion valve 27 discharges a low-temperature and low-pressure gas-liquid two-phase spray-like refrigerant to the evaporator 14.
The evaporator 14 is connected between the electronic expansion valve 27 and the junction pipe 33. The evaporator 14 includes an inlet (not shown) connected to the electronic expansion valve 27 and an outlet (not shown) connected to the inlet (not shown) of the junction pipe 33.

  The control device 18 controls the operation of the vehicle air conditioner 10 based on, for example, a command signal input by an operator via an appropriate switch (not shown) or the like, and switches between heating operation and cooling operation. Control.

  Below, operation | movement of the vehicle air conditioner 10 of 1st Embodiment mentioned above is demonstrated.

First, the heating operation of the vehicle air conditioner 10 will be described with reference to FIG.
The control device 18 introduces the air that has passed through the evaporator 14 into the indoor condenser 16 by opening the damper 15. The control device 18 heats the air in the ventilation duct 11 by dissipating the high-temperature and high-pressure refrigerant discharged from the compressor 21 in the indoor condenser 16.
The control device 18 closes the cooling electromagnetic valve 23 and opens the heating expansion valve 22 with a small diameter, so that the refrigerant is expanded by the heating expansion valve 22 and the refrigerant is made into a low temperature and low pressure spray. In the outdoor heat exchanger 24, the control device 18 absorbs the refrigerant from the atmosphere outside the passenger compartment, and makes the refrigerant into a gas-liquid two-phase spray.
The control device 18 connects the outdoor heat exchanger 24 to the inlet of the merge pipe 33 in the three-way valve 25, thereby causing the gas-liquid separator 26 to separate the refrigerant and causing the compressor 21 to suck the gas-phase refrigerant. . The control device 18 compresses the refrigerant in the compressor 21 so that the refrigerant has a high temperature and a high pressure.

Hereinafter, the cooling operation of the vehicle air conditioner 10 will be described with reference to FIG.
The control device 18 closes the damper 15 to guide the air that has passed through the evaporator 14 to the vehicle interior, bypassing the indoor condenser 16. The control device 18 guides the high-temperature and high-pressure refrigerant discharged from the compressor 21 through the indoor condenser 16 to the first branch pipe 32a.
The control device 18 opens the cooling electromagnetic valve 23 to guide the high-temperature and high-pressure refrigerant to the outdoor heat exchanger 24 by bypassing the heating expansion valve 22. The control device 18 causes the high-temperature and high-pressure refrigerant to dissipate heat to the outdoor atmosphere in the outdoor heat exchanger 24 to make the refrigerant low-temperature and high-pressure.
The control device 18 connects the outdoor heat exchanger 24 to the electronic expansion valve 27 in the three-way valve 25, thereby expanding the refrigerant in the electronic expansion valve 27 to make the refrigerant in a low temperature and low pressure spray state. The control device 18 absorbs heat from the air in the ventilation duct 11 in the evaporator 14 and cools the air in the ventilation duct 11 by making the refrigerant into a gas-liquid two-phase spray.
The control device 18 causes the refrigerant to pass through the merging pipe 33 and introduce it into the gas-liquid separator 26, thereby causing the gas-liquid separator 26 to separate the refrigerant and causing the compressor 21 to suck the gas-phase refrigerant. The control device 18 compresses the refrigerant in the compressor 21 so that the refrigerant has a high temperature and a high pressure.

Below, the defrost operation of the vehicle air conditioner 10 is demonstrated with reference to FIG. 6 and FIG.
During the heating operation of the vehicle air conditioner 10 described above, the control device 18 absorbs heat from the outdoor atmosphere in the outdoor heat exchanger 24, so that frost formation may occur in the outdoor heat exchanger 24. In the outdoor heat exchanger 24 where frost formation has occurred, the heat transfer coefficient decreases and the heat absorption becomes insufficient, so that the air in the ventilation duct 11 is not sufficiently heated. When the control device 18 determines that frost formation has occurred in the outdoor heat exchanger 24 during the heating operation, the control device 18 performs the defrosting operation. In the defrosting operation, the control device 18 performs at least one of the hot gas operation and the reverse defrosting operation, or switches between the hot gas operation and the reverse defrosting operation.

Below, the hot gas driving | operation of the vehicle air conditioner 10 is demonstrated with reference to FIG.
In the hot gas operation, the control device 18 opens the heating expansion valve 22 with a large diameter as an operation different from the heating operation described above. Thereby, the control device 18 causes the high-temperature and high-pressure refrigerant (hot gas) discharged from the compressor 21 to flow into the outdoor heat exchanger 24 as it is.

The control device 18 introduces the air that has passed through the evaporator 14 into the indoor condenser 16 by opening the damper 15. The control device 18 heats the air in the ventilation duct 11 by dissipating the high-temperature and high-pressure refrigerant discharged from the compressor 21 in the indoor condenser 16.
The control device 18 closes the cooling electromagnetic valve 23 and opens the heating expansion valve 22 with a large diameter, so that the refrigerant is not expanded by the heating expansion valve 22 and the outdoor heat exchange is performed with the refrigerant kept at a high temperature and high pressure. Into the vessel 24. The control device 18 causes the refrigerant to dissipate heat to the atmosphere outside the passenger compartment in the outdoor heat exchanger 24 to defrost the outdoor heat exchanger 24.

  In this hot gas operation, water droplets due to condensed water generated in the outdoor heat exchanger 24 drop from the outdoor heat exchanger 24 to the lower vehicle lower portion 52 and accumulate around the drainage hole 51, and from the drainage hole 51 to the outside. Discharged. At this time, the refrigerant flowing into the outdoor heat exchanger 24 with high temperature and high pressure passes through the inlet pipe 45 disposed in the vicinity of the drain hole 51 of the vehicle lower part 52. As a result, the refrigerant in the inlet pipe 45 heats the periphery of the drain hole 51 and prevents water collected around the drain hole 51 from freezing.

Below, the reverse defrost operation of the vehicle air conditioner 10 is demonstrated with reference to FIG.
In the reverse defrosting operation, the control device 18 opens the damper 15 as an operation different from the cooling operation described above. Thereby, the control device 18 introduces the air that has passed through the evaporator 14 into the indoor condenser 16. The control device 18 prevents the temperature of the air from decreasing by heating the air cooled in the evaporator 14 in the indoor condenser 16.

The control device 18 opens the cooling electromagnetic valve 23 to guide the high-temperature and high-pressure refrigerant to the outdoor heat exchanger 24 by bypassing the heating expansion valve 22. The control device 18 performs defrosting of the outdoor heat exchanger 24 by dissipating the high-temperature and high-pressure refrigerant in the outdoor heat exchanger 24 to the atmosphere outside the vehicle compartment and setting the refrigerant to a low temperature and high pressure.
The control device 18 connects the outdoor heat exchanger 24 to the electronic expansion valve 27 in the three-way valve 25, thereby expanding the refrigerant in the electronic expansion valve 27 to make the refrigerant in a low temperature and low pressure spray state. The control device 18 absorbs heat from the air in the ventilation duct 11 in the evaporator 14 and cools the air in the ventilation duct 11 by making the refrigerant into a gas-liquid two-phase spray.
The control device 18 causes the refrigerant to pass through the merging pipe 33 and introduce it into the gas-liquid separator 26, thereby causing the gas-liquid separator 26 to separate the refrigerant and causing the compressor 21 to suck the gas-phase refrigerant. The control device 18 compresses the refrigerant in the compressor 21 so that the refrigerant has a high temperature and a high pressure.
The control device 18 heats the air in the ventilation duct 11 by dissipating the high-temperature and high-pressure refrigerant discharged from the compressor 21 in the indoor condenser 16.

  In this reverse defrosting operation, water droplets due to the condensed water generated in the outdoor heat exchanger 24 drips from the outdoor heat exchanger 24 to the lower vehicle lower part 52 and accumulates around the drainage hole 51 and from the drainage hole 51 to the outside. To be discharged. At this time, the refrigerant flowing into the outdoor heat exchanger 24 with high temperature and high pressure passes through the inlet pipe 45 disposed in the vicinity of the drain hole 51 of the vehicle lower part 52. As a result, the refrigerant in the inlet pipe 45 heats the periphery of the drain hole 51 and prevents water collected around the drain hole 51 from freezing.

  As described above, according to the vehicle air conditioner 10 according to the first embodiment, the high-temperature refrigerant that flows through the inlet pipe 45 by including the inlet pipe 45 disposed in the vicinity of the drain hole 51 of the vehicle lower portion 52. Therefore, it is possible to prevent the water accumulated in the vicinity of the drain hole 51 from freezing.

Hereinafter, a modification of the above-described first embodiment will be described.
In 1st Embodiment mentioned above, although the site | part arrange | positioned in the vicinity of the drain hole 51 among the inlet piping 45 was used as the site | part upstream from the heating expansion valve 22, it is not limited to this.
As shown in FIG. 8, the part arrange | positioned in the vicinity of the drain hole 51 among the inlet piping 45 is a downstream part rather than the expansion valve 22 for heating, for example, the outdoor heat exchanger 24 rather than the 2nd branch pipe 32b. It may be a site on the side.

(Second Embodiment)
The vehicle air conditioner 10 according to the second embodiment is sequentially introduced from the air inlet 11a of the ventilation duct 11 toward the air outlet 11b, similarly to the vehicle air conditioner 10 according to the first embodiment described above. A mouth opening / closing door 12, a blower 13, an evaporator 14, a damper 15, and an indoor capacitor 16 are provided. Furthermore, the vehicle air conditioner 10 includes a heat pump cycle 17 including an evaporator 14 and an indoor side capacitor 16, and a control device 18.
The vehicle air conditioner 10 according to the second embodiment differs from the vehicle air conditioner 10 according to the first embodiment described above in the vicinity of the drain hole 51 in the vehicle lower portion 52 as in the first embodiment described above. It is a point provided with the vehicle lower part 52 in which the drain hole 51 is provided in the vicinity of the header 41 of the outdoor heat exchanger 24 instead of providing the inlet piping 45 arrange | positioned.
As shown in FIG. 9, the vehicle air conditioner 10 according to the second embodiment includes an outdoor heat exchanger 24 disposed above a vehicle lower part (for example, a bumper) 52 in which a drain hole 51 is provided. . The vehicle lower portion 52 includes a receiving portion 53 in the vicinity of the header 41 that covers the lower portion 41 b of the header 41 of the outdoor heat exchanger 24 and is provided with a drain hole 51. The receiving portion 53 protrudes from the vehicle lower portion 52 toward the lower portion 41b of the header 41 of the outdoor heat exchanger 24 inside the vehicle, and has a surface 53a shaped along the surface of the lower portion 41b of the header 41.

  During the defrosting operation of the vehicle air conditioner 10 of the second embodiment, a high-temperature and high-pressure refrigerant is introduced into the header 41 of the outdoor heat exchanger 24 as in the vehicle air conditioner 10 of the first embodiment described above. Is done. The outdoor heat exchanger 24 performs defrosting of the outdoor heat exchanger 24 by dissipating the high-temperature and high-pressure refrigerant to the atmosphere outside the vehicle compartment and setting the refrigerant to a low temperature and high pressure. Water droplets due to the condensed water generated in the outdoor heat exchanger 24 drop from the outdoor heat exchanger 24 to the receiving portion 53 of the lower vehicle lower portion 52 and accumulate around the drain hole 51 and are discharged to the outside from the drain hole 51. The At this time, the refrigerant flowing into the outdoor heat exchanger 24 with high temperature and high pressure flows through the header 41. Thereby, the refrigerant in the header 41 heats the receiving portion 53 that covers the lower portion 41 b of the header 41, and prevents water collected around the drain hole 51 from freezing.

As described above, according to the vehicle air conditioner 10 according to the second embodiment, the drain hole 51 is provided in the vicinity of the header 41 of the outdoor heat exchanger 24, thereby depending on the temperature of the high-temperature refrigerant flowing in the header 41. The water accumulated in the vicinity of the drain hole 51 can be prevented from freezing.
Further, by providing the receiving portion 53 that covers the lower portion 41b of the header 41 and provided with the drain hole 51, water droplets due to condensed water generated in the outdoor heat exchanger 24 are directly (that is, other than the receiving portion 53 in the vehicle body). It can be drained outside (without going through the site). As a result, it is possible to prevent water from collecting in parts other than the receiving portion 53.
Furthermore, by providing the receiving portion 53 that covers the lower portion 41 b of the header 41 and is provided with the drainage hole 51, for example, traveling wind passes through the drainage hole 51 as compared with the case where the drainage hole is provided directly in the vehicle lower portion 52. Can be suppressed. Thereby, it can prevent that the cooling performance of the outdoor heat exchanger 24 and the aerodynamic characteristic of a vehicle fall.

  The embodiments of the present invention are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 10 ... Vehicle air conditioner, 14 ... Evaporator (indoor heat exchanger), 16 ... Indoor side condenser (indoor heat exchanger), 17 ... Heat pump cycle, 18 ... Control apparatus, 21 ... Compressor, 24 ... Outdoor heat exchanger, 41 ... Header, 41b ... Lower part, 45 ... Inlet piping, 51 ... Drain hole, 52 ... Lower part of vehicle

Claims (4)

A compressor for compressing the refrigerant;
An indoor heat exchanger for exchanging heat between the refrigerant and the vehicle interior atmosphere;
An outdoor heat exchanger for performing heat exchange between the refrigerant and the atmosphere outside the vehicle compartment;
A control device that performs cooling and heating by circulating the refrigerant in a circulation channel that passes through the compressor, the indoor heat exchanger, and the outdoor heat exchanger;
A vehicle air conditioner comprising:
A lower part of the vehicle in which a drain hole is provided below the outdoor heat exchanger;
A pipe of the refrigerant disposed in the vicinity of the drain hole;
Comprising
An air conditioner for a vehicle. A compressor for compressing the refrigerant;
An indoor heat exchanger for exchanging heat between the refrigerant and the vehicle interior atmosphere;
An outdoor heat exchanger for performing heat exchange between the refrigerant and the atmosphere outside the vehicle compartment;
A control device that performs cooling and heating by circulating the refrigerant in a circulation channel that passes through the compressor, the indoor heat exchanger, and the outdoor heat exchanger;
A vehicle air conditioner comprising:
A vehicle lower part in which a drainage hole is provided in the vicinity of the header forming the refrigerant passage of the outdoor heat exchanger;
Comprising
An air conditioner for a vehicle. The vehicle lower portion includes a receiving portion that covers a lower portion of the header.
The vehicle air conditioner according to claim 2. The lower part of the vehicle is a bumper.
The vehicular air conditioner according to any one of claims 1 to 3.

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