JP2020199955A - Vehicular air-conditioner - Google Patents

Abstract

To provide a vehicular air-conditioner capable of preventing an increase in pressure loss when a coolant passes through an indoor condenser during cooling.SOLUTION: An indoor condenser 7 arranged on a coolant circulation passage of a heat pump system refrigeration cycle of a vehicular air-conditioner is composed of a first heat exchange part 30 and a second heat exchange part 31. A first header 33 of the first heat exchange part 30 has a refrigerant inlet 44, and a second header similarly has a cooling time refrigerant outlet 45 and a heating time refrigerant outlet. A third header 35 of the second heat exchange part 31 has a heating time refrigerant flow inlet 47, and a fourth header similarly has a heating time refrigerant outlet. The heating time refrigerant flow outlet and the heating time refrigerant flow inlet 47 are in communication with each other via a communication member 49. A refrigerant circulation passage is provided with refrigerant flow switching means for switching between a case of flowing the refrigerant flowing out from the cooling time refrigerant outlet 45 of the indoor condenser 7 to an outdoor heat exchanger and a case of flowing the refrigerant flowing out from the heating time refrigerant outlet of the indoor condenser 7 to the outdoor heat exchanger.SELECTED DRAWING: Figure 3

Description

The present invention relates to a vehicle air conditioner.

In the scope of this specification and claims, the top and bottom, left and right of FIG. 2 are referred to as up and down, left and right, and the downstream side in the ventilation direction (the direction indicated by the arrow X in FIGS. 3 and 4) is the front, and the opposite side is the back. Let's say. Therefore, the top, bottom, left and right when viewed from the rear to the front are the top, bottom, left and right of FIG.

A refrigeration cycle consists of a refrigeration cycle and an air conditioner case as a vehicle air conditioner used for vehicles with relatively little waste heat, such as hybrid vehicles that use an engine and motor as a prime mover and electric vehicles that use a motor as a prime mover. , And an outdoor heat exchanger that is placed outside the vehicle interior and dissipates heat from the refrigerant compressed by the compressor during cooling to condense it, and also receives heat from the refrigerant decompressed during heating to evaporate it. From the indoor evaporator that is placed in the passenger compartment and receives heat from the refrigerant decompressed by the decompressor during cooling and evaporates, and the refrigerant that is placed inside the passenger compartment and allows the refrigerant to pass through during cooling and is compressed by the compressor during heating. A vehicle air conditioner including an indoor condenser that dissipates and condenses heat and a refrigerant circulation path that circulates a refrigerant between a compressor, an outdoor heat exchanger, an indoor evaporator, and an indoor condenser is known.

In this type of known vehicle air conditioner, the decrease in heating efficiency during heating is suppressed, and the pressure loss when the gaseous refrigerant passes through the indoor condenser during cooling is reduced to improve the cooling performance. It is required to be sustainable.

As a vehicle air conditioner that meets such a demand, a vehicle air conditioner described in Patent Document 1 has been proposed. The vehicle air conditioner described in Patent Document 1 is a known vehicle air conditioner described above, wherein the indoor condensers are composed of two heat exchange portions arranged side by side in the ventilation direction, and each heat exchange unit has a longitudinal direction. A plurality of refrigerant flow pipes arranged in parallel with each other spaced apart from each other in the vertical direction, and arranged on both sides of the refrigerant flow pipe in the longitudinal direction with the longitudinal direction facing the arrangement direction of the refrigerant flow pipes. It is provided with a pair of upper and lower headers to which both ends in the longitudinal direction of the refrigerant flow pipe are connected, and a refrigerant inlet is formed at one end of the lower header of the first heat exchange portion arranged on the leeward side, and the refrigerant inlet is formed on the leeward side. A refrigerant outlet is formed at the same end as the refrigerant inlet in the lower header of the arranged second heat exchange section, and is biased toward the opposite side of the refrigerant inlet from the central portion in the longitudinal direction of the lower header of the first heat exchange section. Is provided with a partition member that divides the lower header into two sections in the longitudinal direction, and the lower header is placed in a portion that is biased toward the side opposite to the refrigerant outlet from the central portion in the longitudinal direction of the lower header of the second heat exchange portion. A partition member that divides into two sections in the longitudinal direction is provided, and the partition members of both heat exchange portions are located at the same positions in the longitudinal direction of both lower headers, and the refrigerant inlet is higher than the partition member in the lower header of the first heat exchange portion. The section on the opposite side of the second heat exchange section and the section on the side opposite to the refrigerant outlet from the partition member in the lower header of the second heat exchange section are communicated with each other and connected to the two sections of the first heat exchange section. The cross-sectional area of the flow pipe passages is larger than the cross-sectional area of the refrigerant introduction pipes connected to the refrigerant inlets, and the refrigerant flow pipes connected to the refrigerant outlet side section of the lower header of the second heat exchange section. The number is also larger than the number of refrigerant flow pipes connected to the compartment on the opposite side of the refrigerant outlet.

Japanese Unexamined Patent Publication No. 2014-228242

However, in the vehicle air conditioner described in Patent Document 1, the effect of reducing the pressure loss is insufficient because the high-temperature and high-pressure gaseous refrigerant flows through all the refrigerant flow pipes during cooling.

An object of the present invention is to provide a vehicle air conditioner capable of solving the above problems, suppressing a decrease in heating efficiency during heating, and preventing an increase in pressure loss when the refrigerant passes through an indoor condenser during cooling. To provide.

The present invention comprises the following aspects in order to achieve the above object.

1) It consists of a refrigeration cycle and an air conditioner case. The refrigeration cycle is arranged outside the passenger compartment and dissipates heat from the refrigerant compressed by the compressor during cooling and condenses it, and also decompresses the refrigerant during heating. An outdoor heat exchanger that receives heat and evaporates it, an indoor evaporator that is placed in the passenger compartment and receives heat from the refrigerant that has been decompressed during cooling and evaporates it, and an indoor evaporator that is placed inside the passenger compartment and allows the refrigerant to pass through during cooling. It also has an indoor condenser that dissipates heat from the refrigerant compressed by the compressor during heating and condenses it, and a refrigerant circulation path that circulates the refrigerant between the compressor, the outdoor heat exchanger, the indoor evaporator, and the indoor condenser. It is a vehicle air conditioner
The indoor condenser of the refrigeration cycle consists of a first heat exchange section and a second heat exchange section arranged side by side in the ventilation direction, and the heat exchange sections are spaced apart from each other with their longitudinal directions facing the same direction. A plurality of refrigerant flow pipes arranged in parallel are arranged on both sides of the refrigerant flow pipe in the longitudinal direction with the longitudinal direction facing the arrangement direction of the refrigerant flow pipe, and both ends in the longitudinal direction of the refrigerant flow pipe are connected. It is provided with a pair of headers, one first header of the first heat exchange section has a refrigerant inlet for cooling and heating, and the other second header of the first heat exchange section has a cooling refrigerant outlet. And a heating refrigerant outlet, one third header of the second heat exchange section has a heating refrigerant inlet, and the other fourth header of the second heat exchange section has a heating refrigerant outlet. However, the heating refrigerant outlet of the second header of the first heat exchange section and the heating refrigerant inlet of the third header of the second heat exchange section are communicated by a communication member.
The flow of the refrigerant flows through the refrigerant circulation path of the refrigeration cycle, and the refrigerant that flows out from the cooling refrigerant outlet of the indoor condenser during cooling flows to the outdoor heat exchanger, and the refrigerant that flows out from the heating refrigerant outlet of the indoor condenser during heating. A vehicle air conditioner provided with a refrigerant flow switching means for switching between flowing in an outdoor heat exchanger and switching.

2) The vehicle air conditioner according to claim 1 above, wherein the first header and the third header, and the second header and the fourth header of the indoor condenser are provided on the same end side in the longitudinal direction of the refrigerant flow pipe, respectively. apparatus.

3) The refrigerant inlet is located at one end of the first header, the cooling refrigerant outlet is located at the end opposite to the refrigerant inlet in the second header, and the heating refrigerant outlet is the cooling refrigerant in the second header. The heating refrigerant inlet is located at the end opposite to the outlet, the heating refrigerant inlet is located at the end on the same side as the heating refrigerant outlet in the third header, and the heating refrigerant outlet is the heating refrigerant flow in the fourth header. The vehicle air conditioner according to 2) above, which is located at the end on the same side as the outlet and the refrigerant inlet for heating.

4) The vehicle air conditioner according to 3) above, wherein the communication member comprises a communication pipe having one end connected to the second header and the other end connected to the third header.

5) The first heat exchange part of the indoor condenser is arranged on the leeward side of the second heat exchange part, and the refrigerant flow pipes of each heat exchange part are arranged with the longitudinal direction facing up and down. The vehicle air conditioner described in any of 4).

6) For vehicles according to 5) above, the first header and the third header are provided on the upper end side of the refrigerant flow pipe, and the second header and the fourth header are provided on the lower end side of the refrigerant flow pipe. Air conditioner.

7) Refrigerant flow switching means is provided in the refrigerant circulation path of the refrigeration cycle, and is also provided in the refrigerant circulation path during cooling, which is connected to the cooling refrigerant outlet of the indoor capacitor and allows the refrigerant to flow only during cooling. The above-mentioned is composed of a heating refrigerant discharge part which is connected to the heating refrigerant outlet of the indoor condenser and allows the refrigerant to flow only during heating, and an on-off valve provided in each of the cooling refrigerant discharge part and the heating refrigerant discharge part. The vehicle air conditioner according to any one of 1) to 6).

According to the vehicle air conditioners 1) to 7) above, when the vehicle interior is cooled, the refrigerant that has flowed into the first header from the refrigerant inlet by the action of the refrigerant flow switching means is the total refrigerant in the first heat exchange section. Since it flows out from the refrigerant outlet during cooling through the flow pipe and the second header and is sent to the outdoor heat exchanger, the number of refrigerant flow pipes through which the refrigerant passes is reduced, and the pressure loss when the refrigerant passes through the indoor capacitor is reduced. The increase can be prevented. Moreover, when heating the vehicle interior, the refrigerant that has flowed into the first header from the refrigerant inlet flows out from the heating refrigerant outlet through all the refrigerant flow pipes and the second header of the first heat exchange section, and passes through the communication member. Since it flows into the third header from the refrigerant inflow port during heating and flows out from the refrigerant outlet during heating through all the refrigerant flow pipes of the second heat exchange section and the fourth header, it is possible to prevent a decrease in heating efficiency. ..

According to the vehicle air conditioners of 3) and 4) above, the cooling refrigerant outlet and the heating refrigerant inlet can be relatively easily communicated by the communication member.

According to the vehicle air conditioner in 5) above, during vehicle interior heating, the air conditioning air is heated by removing heat from the refrigerant in the second heat exchange section, and then in the second heat exchange section in the first heat exchange section. Since the heat is taken from the refrigerant having a higher temperature than the refrigerant flowing through the air conditioner, the heating efficiency of the air conditioning air is improved. On the other hand, during vehicle interior heating, the refrigerant dissipates heat to the relatively high temperature air conditioning air in the first heat exchange section, and then has a lower temperature than the air conditioning air passing through the first heat exchange section in the second heat exchange section. Since heat is radiated to the air conditioning air of the above, liquefaction of the refrigerant is promoted.

According to the vehicle air conditioner in 7) above, the refrigerant that flows out from the cooling refrigerant outlet of the indoor condenser during cooling flows to the outdoor heat exchanger, and the refrigerant that flows out from the heating refrigerant outlet of the indoor condenser during heating is outdoors. It can be switched relatively easily between the case of flowing through a heat exchanger.

It is the schematic which shows the whole structure of the air conditioner for a vehicle by this invention. It is a rear view which omitted a part which shows the indoor condenser of the heat pump type refrigeration cycle used in the air conditioner for a vehicle by this invention. It is a top view of the chamber capacitor of FIG. It is a right side view of the chamber capacitor of FIG. It is a left side view of the chamber capacitor of FIG. FIG. 2 is an enlarged cross-sectional view taken along the line AA of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In the following description, the term "aluminum" shall include aluminum alloys in addition to pure aluminum.

FIG. 1 shows the overall configuration of a vehicle air conditioner according to the present invention. 2 to 6 show an indoor condenser of a heat pump type refrigeration cycle used in the vehicle air conditioner of FIG.

In FIG. 1, a vehicle air conditioner preferably used for a hybrid vehicle or an electric vehicle includes a heat pump type refrigeration cycle (1) and an air conditioner case (2).

The heat pump type refrigeration cycle (1) dissipates heat from the refrigerant (3) and the refrigerant that is placed outside the vehicle interior and is compressed by the compressor (3) during cooling to condense and depressurize during heating. An outdoor heat exchanger (4) that receives heat and evaporates it, and an expansion valve (5) as a first decompressor that decompresses the refrigerant dissipated by the outdoor heat exchanger (4) during cooling, are arranged in the passenger compartment. In addition, the indoor evaporator (6), which receives heat from the refrigerant decompressed by the expansion valve (5) during cooling and evaporates, and the refrigerant placed in the vehicle interior and compressed by the compressor (3) during cooling pass through and heat. An indoor condenser (7) that dissipates heat from the refrigerant compressed by the compressor (3) and condenses it, and a fixed throttle valve (2) as a second decompressor that decompresses the refrigerant dissipated by the indoor condenser (7) during heating. 8) and the fixed throttle valve (8) are installed in parallel, and the flow of the refrigerant to the fixed throttle valve (8) is blocked during cooling and the refrigerant flows only to the fixed throttle valve (8) during heating. The on-off valve (9) and the refrigerant that passed through the indoor evaporator (6) during cooling are separated into two phases of gas and liquid, and the refrigerant that has passed through the outdoor heat exchanger (4) during heating is separated into two phases of gas and liquid. It is provided with a liquid separator (11) and a refrigerant circulation path (12) that connects these devices and circulates refrigerant between these devices.

The first cooling refrigerant flow unit in which the refrigerant flows between the refrigerant outflow side of the outdoor heat exchanger (4) and the refrigerant inflow side of the gas-liquid separator (11) in the refrigerant circulation path (12) only during cooling. (13) and the first heating refrigerant flow section (14) through which the refrigerant flows only during heating are provided in parallel, and the expansion valve (5) and the room are provided in the first cooling refrigerant flow section (13). The evaporator (6) is arranged. Outflow from the main body portion (12a) in the refrigerant circulation path (12) to the first cooling refrigerant flow section (13) and the first heating refrigerant flow section (14), that is, the outdoor heat exchanger (4). A three-way valve (15) is provided at a portion where the refrigerant is divided into the first cooling refrigerant flow section (13) and the first heating refrigerant flow section (14). In addition, the refrigerant circulation section (12) has a cooling refrigerant discharge section (16) that allows the refrigerant to flow only during cooling and discharges the refrigerant from the indoor condenser (7), and an indoor condenser (7) that allows the refrigerant to flow only during heating. ) Is provided in parallel with the heating refrigerant discharge section (17), and the on-off valves (18) (19) are provided in the cooling refrigerant discharge section (16) and the heating refrigerant discharge section (17), respectively. ) Is provided. Refrigerant inflow of the outdoor heat exchanger (4) and the downstream side of the junction of the cooling refrigerant discharge section (16) and the heating refrigerant discharge section (17) to the main body (12a) in the refrigerant circulation path (12). A second cooling refrigerant flow section (21) through which the refrigerant flows only during cooling and a second heating refrigerant flow section (22) through which the refrigerant flows only during heating are provided in parallel between the sides. An on-off valve (9) is provided in the second cooling refrigerant flow section (21), and a fixed throttle valve (8) is provided in the second heating refrigerant flow section (22).

The air conditioning case (2) has an air introduction section (23) in which air conditioning air is introduced into the air conditioning case (2), an air inlet (24) that sends air conditioning air to the air introduction section (23), and air introduction. The first passage portion (26) provided in parallel between the air passage (25) for sending the air conditioning air sent into the portion (23) into the passenger compartment and the intermediate portion in the air flow direction of the air passage (25). And the second passage portion (27) and the amount of air conditioning air flowing through one of the two passage portions (26) (27) of the air passage (25) and the amount of air conditioning air flowing through the other are adjusted. It is equipped with a damper (28). Further, although not shown, the air conditioning case (2) is formed with a face outlet, a foot outlet, and a defroster outlet (all not shown).

The indoor evaporator (6) of the heat pump type refrigeration cycle (1) is closer to the air introduction part (23) than the first passage part (26) and the second passage part (27) in the air passage (25) of the air conditioning case (2). Is arranged, and an indoor capacitor (7) is arranged in the first passage portion (26). In addition, air conditioning air is introduced into the air inlet (23) of the air conditioning case (2) from the air inlet (24), and at least one of the face outlet, the foot outlet, and the defroster outlet is introduced through the air passage (25). A blower (29) that blows air into the passenger compartment from any one is arranged.

When cooling the interior of the vehicle, the refrigerant is compressed by the compressor (3), passes through the indoor condenser (7), and then sent to the outdoor heat exchanger (4) to be sent to the outdoor heat exchanger (4) to the outside of the vehicle. Heat is radiated to the air and condensed, then decompressed by the expansion valve (5), then the heat is taken from the air conditioning air by the indoor evaporator (6) and evaporated, and then the gas-liquid separator (11) separates the gas and liquid. After that, it is returned to the compressor (3) (see the dashed arrow in Fig. 1). When heating the interior of the vehicle, the refrigerant is compressed by the compressor (3), then radiates heat to the air for air conditioning by the indoor condenser (7) and condenses, and then is decompressed by the fixed throttle valve (8) and then outdoors. The heat exchanger (4) removes heat from the outside air and evaporates it, and then the gas-liquid separator (11) separates the air and liquid and then returns it to the compressor (3) (see the solid line arrow in Fig. 1).

The damper (28) of the air conditioning case (2) passes through the indoor evaporator (6) by opening and closing the upstream ends of the two passage portions (26) (27) of the air passage (25), and then the indoor condenser (7). ) And the ratio of the amount of air that bypasses the indoor condenser (7) after passing through the indoor evaporator (6).

As shown in FIGS. 2 to 6, the indoor condenser (7) is composed of two heat exchange parts (30) (31) arranged in the ventilation direction, and each heat exchange part (30) (31) is in the longitudinal direction. A plurality of aluminum refrigerant flow pipes (32) arranged in parallel with each other at intervals in the left-right direction with the refrigerant flowing in the vertical direction, and the direction in which the refrigerant flow pipes (32) are arranged in the longitudinal direction (horizontal direction). A pair of aluminum headers (33) (34) arranged on both sides (upper and lower sides) of the refrigerant flow pipe (32) in the longitudinal direction and connected to both ends of the refrigerant flow pipe (32) in the longitudinal direction. It has (35) and (36). In the following description, the heat exchange section (30) on the front side (downstream side in the ventilation direction) is referred to as the first heat exchange section, and the heat exchange section (31) on the rear side (upstream side in the ventilation direction) is referred to as the second heat exchange section. Shall be. The upper end of the refrigerant flow pipe (32) of the first heat exchange section (30) is connected to the upper first header (33), and the lower end thereof is connected to the lower second header (34). The upper end of the refrigerant flow pipe (32) of the second heat exchange section (31) is connected to the upper third header (35), and the lower end thereof is connected to the lower fourth header (36). There is. An aluminum upper end member (37) brazing material straddles the left and right ends of the first header (33) of the first heat exchange section (30) and the third header (35) of the second heat exchange section (31). The lower end member (38) made of aluminum straddles the left and right ends of the second header (34) of the first heat exchange section (30) and the fourth header (36) of the second heat exchange section (31). ) Are joined via brazing filler metal. Hereinafter, joining via a brazing material will be referred to as brazing.

The refrigerant flow pipe (32) of the first heat exchange section (30) and the refrigerant flow pipe (32) of the second heat exchange section (31) are located at the same position in the left-right direction, and two refrigerant flows arranged in the ventilation direction. An aluminum brazing sheet in which a pipe set (39) is formed by pipes (32), a ventilation gap (41) is formed between pipe sets (39) adjacent to each other in the left-right direction, and a brazing material layer is provided on both sides in the ventilation gap. Each tube assembly (39) consists of a corrugated aluminum outer fin (42) consisting of a wave apex extending in the anteroposterior direction, a wave bottom extending in the anteroposterior direction, and a connecting portion connecting the wave top and the wave bottom. It is arranged so as to straddle the two refrigerant flow pipes (32) constituting the above, and the outer fins (42) are brazed to both refrigerant flow pipes (32) (see FIG. 6). In FIG. 6, detailed illustration of the louver of the outer fin (42) and the like is omitted. In addition, outer fins (42) are also arranged outside the pipes (39) at both left and right ends so as to straddle the two refrigerant flow pipes (32) constituting the pipes (39). Both refrigerant flow pipes (32) are brazed, and aluminum side plates (43) are arranged on the outside of the outer fins (42) at both left and right ends and are brazed to the outer fins (42).

On the other hand in the first heat exchange section (30), here the upper aluminum first header (33) has a refrigerant inlet (44) during cooling and heating, and the other of the first heat exchange section (30), Here, the lower aluminum second header (34) has a cooling refrigerant outlet (45) and a heating refrigerant outlet (46), in the second heat exchange section (31), while here on the upper side. The aluminum third header (35) has a heating refrigerant inlet (47), while the lower aluminum fourth header (36) has a heating refrigerant outlet, while the second heat exchange section (31). Has (48). The cooling and heating refrigerant inlets (44) and heating refrigerant inlets (47) are formed on the right upper end member (37), and the cooling refrigerant outlets (45) are on the left lower end member (38). It is formed, and the heating refrigerant outlet (46) and the heating refrigerant outlet (48) are formed on the lower end member (38) on the right side. That is, the first header (33) and the third header (35) of the indoor capacitor, and the second header (34) and the fourth header (36) are located on the same end side in the longitudinal direction of the refrigerant flow pipe (32), respectively. The refrigerant inlet (44) is located at the right end of the first header (33), and the cooling refrigerant outlet (45) is located at the left end of the second header (34) opposite to the refrigerant inlet (44). The heating refrigerant outlet (46) is located at the right end of the second header (34) opposite to the cooling refrigerant outlet (45), and the heating refrigerant inlet (47) is the third. Located at the right end on the same side as the heating refrigerant outlet (46) in the header (35), the heating refrigerant outlet (48) is the heating refrigerant outlet (46) and the heating refrigerant in the fourth header (36). It is located at the right end on the same side as the inlet (47). The heating refrigerant outlet (46) of the second header (34) of the first heat exchange section (30) and the heating refrigerant inlet (47) of the third header (35) of the second heat exchange section (31). However, one end is brazed to the lower end member (38) on the right side and connected to the second header (34), and the other end is brazed to the upper end member (37) on the right side to be connected to the third header. It is communicated by a communication member (49) made of an aluminum pipe connected to (35).

The cooling refrigerant outlet (45) of the indoor condenser (7) is connected to the cooling refrigerant discharge section (16) of the refrigerant circulation path (12), and the heating refrigerant outlet (48) is connected to the refrigerant circulation path (12) during heating. The refrigerant discharge unit (17) is connected. Then, the cooling refrigerant discharge section (16) in which the refrigerant flows only during cooling, the heating refrigerant discharge section (17) in which the refrigerant flows only during heating, the cooling refrigerant discharge section (16), and the heating refrigerant discharge section. The on-off valves (18) and (19) provided in (17) allow the flow of refrigerant to flow out into the refrigerant circulation path (12) from the cooling refrigerant outlet (45) of the indoor condenser (7) during cooling. Refrigerant flow switching to switch between the case where the refrigerant flows to the outdoor heat exchanger (4) and the case where the refrigerant flowing out from the heating refrigerant outlet (48) of the indoor condenser (7) during heating flows to the outdoor heat exchanger (4). Means are configured.

As the refrigerant flow direction switching means, the cooling refrigerant discharge unit (16), the heating refrigerant discharge unit (17), the cooling refrigerant discharge unit (16), and the heating refrigerant discharge unit (17) circulate the refrigerant. A one consisting of a three-way valve provided at a portion merging with the main body portion (12a) of the road 2) may be used.

In the vehicle air conditioner having the above-described configuration, when the vehicle interior is cooled, the damper (28) of the air conditioner case (2) blocks the air flow to the first passage portion (26) and the second passage portion (27). ) Can be switched to a position that allows air flow (see the solid line in Fig. 1). Even when the vehicle interior is cooled, the air that has passed through the indoor evaporator (6) may flow through both passages (26) and (27). Further, in the heat pump type refrigeration cycle (1), the refrigerant is supplied to the first and second cooling refrigerant flow sections (13) by the action of the three-way valve (15) and the three on-off valves (9) (18) (19). It flows through the refrigerant circulation path (12) through (21) and the cooling refrigerant discharge section (16).

As shown by the broken arrow in FIG. 1, the refrigerant is compressed by the compressor (3) to a high temperature and high pressure, then passed through the indoor condenser (7), and then sent to the outdoor heat exchanger (4). The outdoor heat exchanger (4) dissipates heat to the outdoor air of the vehicle and condenses it, and then the pressure is reduced by the expansion valve (5), and then the indoor evaporator (6) flows through the air passage (25) of the air conditioning case (2). It takes heat from the air conditioning air and evaporates, and then the gas-phase refrigerant separated by the gas-liquid separator (11) is returned to the compressor (3). When the gaseous refrigerant compressed by the compressor (3) and having a high temperature and high pressure passes through the indoor condenser (7), the first header (30) of the first heat exchange section (30) from the refrigerant inlet (44) Enter the inside of 33), flow through all the refrigerant flow pipes (32) of the first heat exchange section (30), enter the second header (34), and from the cooling refrigerant outlet (45) to the cooling refrigerant discharge section (16). Leaked into. Therefore, the refrigerant only passes through the first heat exchange section (30), and the number of refrigerant flow pipes (32) through which the refrigerant flows is reduced. As a result, it is possible to prevent an increase in pressure loss when the refrigerant passes through the indoor capacitor (7). The air-conditioning air that has been deprived of heat by the indoor evaporator (6) is blown into the vehicle interior through the second passage portion (27).

A position where the damper (28) of the air conditioning case (2) allows the air flow to the first aisle portion (26) and blocks the air flow to the second aisle portion (27) when heating the passenger compartment. Can be switched to (see the chain line in Fig. 1). Even when the vehicle interior is heated, the air that has passed through the indoor evaporator (6) may flow through both passages (26) and (27). Further, in the heat pump type refrigeration cycle (1), the refrigerant is supplied to the first and second heating refrigerant flow sections (14) by the action of the three-way valve (15) and the three on-off valves (9) (18) (19). It flows through the refrigerant circulation path (12) through (22) and the refrigerant discharge section (17) during heating.

As shown by the solid line in FIG. 1, the refrigerant is compressed by the compressor (3) to a high temperature and high pressure, and then from the refrigerant inlet (44) to the first heat exchange section (30) of the indoor condenser (7). It flows into the header (33), passes through all the headers (33) (34) (35) (36) and all the refrigerant flow pipes (32), and flows out from the heating refrigerant outlet (48). The heat of the high-temperature and high-pressure refrigerant is dissipated to the air-conditioning air flowing through the ventilation gap (41) through the outer fins (42) while flowing through the refrigerant flow pipe (32), and the refrigerant is condensed. When the gaseous refrigerant compressed by the compressor (3) to a high temperature and high pressure passes through the indoor condenser (7), the first header (30) of the first heat exchange section (30) is connected to the refrigerant inlet (44). It enters the inside of 33), flows through all the refrigerant flow pipes (32) of the first heat exchange section (30), enters the second header (34), flows out from the refrigerant outlet (46) during heating, and is a communication member (49). ), Enters the third header (35) of the second heat exchange section (31) from the cooling refrigerant inlet (47) during heating, and then flows through all the refrigerant flow pipes (32) of the second heat exchange section (31). Then, it enters the fourth header (36) and flows out from the heating refrigerant outlet (48) to the heating refrigerant discharge section (17). Therefore, since the refrigerant flows through all the refrigerant flow pipes (32) of the first heat exchange section (30) and the second heat exchange section (31), it is possible to prevent a decrease in heating efficiency. The air-conditioning air that has taken heat from the refrigerant through the ventilation gap (41) of the indoor condenser (7) is blown into the vehicle interior through the first passage portion (26). The refrigerant dissipated in the indoor condenser (7) is decompressed by the fixed throttle valve (8), then heat is taken from the vehicle interior air in the outdoor heat exchanger (4) and evaporated, and then the gas-liquid separator (11). The vapor phase refrigerant separated in is returned to the compressor (3).

When dehumidifying the interior of the vehicle during such heating of the vehicle interior, the amount of air sent to the indoor condenser (7) after passing through the indoor evaporator (6) by the damper (28) and the indoor evaporator (6). ), The ratio of the amount of air bypassing the indoor condenser (7) is adjusted so that the amount of air sent to the indoor condenser (7) after passing through the indoor evaporator (6) does not become zero.

In addition, when the temperature of the outdoor air inside the vehicle is low during the above-mentioned heating of the vehicle interior, the condensed water generated in the outdoor heat exchanger (4) may freeze and frost, and the outdoor heat exchanger ( It is necessary to defrost from 4). In this case, the damper (28) of the air conditioning case (2) is switched to a position that allows the air flow to the first passage portion (26) and blocks the air flow to the second passage portion (27). .. Further, the heat pump type refrigeration cycle (1) is put into the same operating state as the above-mentioned cooling. That is, the refrigerant is compressed by the compressor (3) to a high temperature and high pressure, then passed through the first heat exchanger (30) of the indoor condenser (7), and then sent to the outdoor heat exchanger (4). The outdoor heat exchanger (4) dissipates heat to the outdoor air and condenses it, and then the expansion valve (5) decompresses the heat, and then the indoor evaporator (6) heats from the air conditioning air flowing through the air passage (25). It is deprived of heat and evaporated, and then it is separated into gas and liquid by the gas and liquid separator (11) and then returned to the compressor (3). The frost formation of the outdoor heat exchanger (4) is defrosted by the heat of the high-temperature and high-pressure refrigerant flowing through the outdoor heat exchanger (4). Further, when the refrigerant compressed by the compressor (3) to have a high temperature and high pressure passes through the first heat exchange portion (30) of the indoor condenser (7), the heat of the refrigerant is transferred to the first passage portion (26). Since the heat is radiated to the air-conditioning air flowing through the vehicle, the air-conditioning air that has taken heat from the refrigerant is blown out into the vehicle interior, and a sudden temperature drop in the vehicle interior is suppressed.

The vehicle air conditioner according to the present invention is suitably used for a hybrid vehicle or an electric vehicle.

(1): Heat pump type refrigeration cycle
(2): Air conditioning case
(3): Compressor
(4): Outdoor heat exchanger
(6): Indoor evaporator
(7): Indoor capacitor
(12): Refrigerant circulation path
(16): Refrigerant discharge part during cooling
(17): Refrigerant discharge section during heating
(18) (19): On-off valve
(30): 1st heat exchange unit
(31): Second heat exchange section
(32): Refrigerant flow pipe
(33): First header
(34): Second header
(35): Third header
(36): Fourth header
(44): Refrigerant inlet
(45): Refrigerant outlet during cooling
(46): Refrigerant outlet during heating
(47): Refrigerant inflow port during heating
(48): Refrigerant outlet during heating
(49): Communication member

Claims (7)

It consists of a refrigeration cycle and an air conditioner case. The refrigeration cycle dissipates heat from the refrigerant that is placed outside the passenger compartment and is compressed by the compressor during cooling and condenses it, and heats the refrigerant that is decompressed during heating. An outdoor heat exchanger that receives heat and evaporates it, an indoor evaporator that is placed in the passenger compartment and receives heat from the refrigerant that has been decompressed during cooling and evaporates it, and an indoor evaporator that is placed inside the passenger compartment and allows the refrigerant to pass through and heats up during cooling. For vehicles equipped with an indoor condenser that dissipates heat from the refrigerant sometimes compressed by the compressor and condenses it, and a refrigerant circulation path that circulates the refrigerant between the compressor, the outdoor heat exchanger, the indoor evaporator and the indoor condenser. It is an air conditioner
The indoor condenser of the refrigeration cycle consists of a first heat exchange section and a second heat exchange section arranged side by side in the ventilation direction, and the heat exchange sections are spaced apart from each other with their longitudinal directions facing the same direction. A plurality of refrigerant flow pipes arranged in parallel are arranged on both sides of the refrigerant flow pipe in the longitudinal direction with the longitudinal direction facing the arrangement direction of the refrigerant flow pipe, and both ends in the longitudinal direction of the refrigerant flow pipe are connected. It is provided with a pair of headers, one first header of the first heat exchange section has a refrigerant inlet for cooling and heating, and the other second header of the first heat exchange section has a cooling refrigerant outlet. And a heating refrigerant outlet, one third header of the second heat exchange section has a heating refrigerant inlet, and the other fourth header of the second heat exchange section has a heating refrigerant outlet. However, the heating refrigerant outlet of the second header of the first heat exchange section and the heating refrigerant inlet of the third header of the second heat exchange section are communicated by a communication member.
The flow of the refrigerant flows through the refrigerant circulation path of the refrigeration cycle, and the refrigerant that flows out from the cooling refrigerant outlet of the indoor condenser during cooling flows to the outdoor heat exchanger, and the refrigerant that flows out from the heating refrigerant outlet of the indoor condenser during heating. A vehicle air conditioner provided with a refrigerant flow switching means for switching between flowing in an outdoor heat exchanger and switching. The vehicle air conditioner according to claim 1, wherein the first header and the third header, and the second header and the fourth header of the indoor condenser are provided on the same end side in the longitudinal direction of the refrigerant flow pipe, respectively. The refrigerant inlet is located at one end of the first header, the cooling refrigerant outlet is located at the end opposite to the refrigerant inlet in the second header, and the heating refrigerant outlet is the cooling refrigerant outlet in the second header. Is located at the opposite end, the heating refrigerant inlet is located at the same end as the heating refrigerant outlet in the third header, and the heating refrigerant outlet is the heating refrigerant outlet and in the fourth header. The vehicle air conditioner according to claim 2, which is located at an end on the same side as the cooling refrigerant inlet during heating. The vehicle air conditioner according to claim 3, wherein the communication member comprises a communication pipe having one end connected to the second header and the other end connected to the third header. Claims 2 to 4 in which the first heat exchange section of the indoor condenser is arranged on the leeward side of the second heat exchange section, and the refrigerant flow pipes of each heat exchange section are arranged with the longitudinal direction facing up and down. The vehicle air conditioner described in any of them. The vehicle air conditioner according to claim 5, wherein the first header and the third header are provided on the upper end side of the refrigerant flow pipe, and the second header and the fourth header are provided on the lower end side of the refrigerant flow pipe. .. The refrigerant flow switching means is provided in the refrigerant circulation path of the refrigeration cycle, and is also provided in the refrigerant circulation path as well as the cooling refrigerant discharge section which is connected to the cooling refrigerant outlet of the indoor capacitor and allows the refrigerant to flow only during cooling. A claim 1 comprising an on-off valve provided at each of a heating refrigerant discharge unit connected to a heating refrigerant outlet of an indoor condenser and flowing a refrigerant only during heating, and a cooling refrigerant discharge unit and a heating refrigerant discharge unit. The vehicle air conditioner according to any one of 6 to 6.

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