JP2005112247A - Air conditioner for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner for a vehicle, improved in efficiency of a compressor. <P>SOLUTION: This air conditioner 1 for a vehicle is mounted on the vehicle including a cooling circuit for circulating a coolant for cooling a vehicle driving means (ENG). The air conditioner for a vehicle includes: a compressor 2 for compressing a heating medium; a coolant internal heat exchanger 4 for performing heat exchange between the heating medium compressed by the compressor and the coolant to absorb the heat of the heating medium in the coolant; an oil separator 6 for separating oil mixed in the head medium from which heat is robbed by the coolant internal heat exchanger; a cabin external heat exchanger 10; pressure reducing means 12, 16; a cabin internal heat exchanger 18; and an oil return pipeline 22 for returning the oil separated from the heating medium by the oil separator to the inlet side of the compressor. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an air conditioner, and more particularly to a vehicle air conditioner mounted on a vehicle.

JP 2000-55488 A (Patent Document 1) describes a refrigeration apparatus. This refrigeration system uses carbon dioxide as a heat medium, introduces supercritical carbon dioxide discharged from the compressor into the oil separator, and in this oil separator, carbon dioxide and the lubricating oil of the compressor And the separated lubricating oil is returned to the compressor.
Japanese Patent Laid-Open No. 2000-46420 (Patent Document 2) describes a refrigeration cycle. In this refrigeration cycle, the heat medium that has been compressed by the compressor and released heat by the radiator is introduced into the oil separator, and carbon dioxide and the lubricating oil of the compressor are separated and separated by this oil separator. The lubricated oil is returned to the compressor.

  Furthermore, JP 2000-274890 A (Patent Document 3) describes a supercritical cycle. In this supercritical cycle, the lubricating oil is separated from the heat medium discharged from the compressor and entering the indoor heat exchanger via the outdoor heat exchanger by an oil separator provided between the outdoor heat exchanger and the indoor heat exchanger. doing.

JP 2000-55488 A JP 2000-46420 A JP 2000-274890 A

  However, in the refrigeration apparatus described in Patent Document 1, since the high-temperature lubricating oil separated from the high-temperature heat medium discharged from the compressor is returned to the suction side of the compressor, it is sucked into the compressor. Since the temperature of the heating medium also rises, there is a problem that the density of the heating medium is lowered and the volume efficiency of the compressor is lowered.

  On the other hand, in the refrigeration cycle described in Patent Document 2, since the heat medium after the heat is released by the radiator is introduced into the oil separator, the lubricating oil separated from the heat medium by the oil separator is not so hot. However, since this refrigeration cycle assumes only cooling operation, there is a problem that it cannot be applied to heating operation of an air conditioner. Further, when the refrigeration cycle described in Patent Document 2 or the supercritical cycle described in Patent Document 3 is applied to an air conditioner for a vehicle, the radiator and the compressor connected to the oil separator vibrate the vehicle. When they vibrate individually and their relative positions change, there is a problem that an excessive force is applied to the piping that returns the lubricating oil from the oil separator to the compressor. In addition, in order to avoid this problem, there is a problem that it is necessary to take anti-vibration measures such as using a flexible hose in the piping for returning the lubricating oil from the oil separator to the compressor.

Accordingly, an object of the present invention is to provide a vehicle air conditioner with improved compressor efficiency.
Another object of the present invention is to provide a vehicle air conditioner that does not require any special anti-vibration measures for piping that returns oil from an oil separator.

  In order to achieve the above object, a first aspect of the present invention is a vehicle air conditioner mounted on a vehicle including a cooling circuit that circulates coolant for cooling the vehicle drive means. A compressor that compresses the medium, a heat exchanger that exchanges heat between the heat medium compressed by the compressor and the coolant, and absorbs the heat of the heat medium in the coolant, and heat is absorbed by the coolant heat exchanger. Oil separator that separates oil mixed in the deprived heat medium, an exterior heat exchanger that is placed outside the vehicle and exchanges heat between the heat medium and outside air, and the pressure of the heat medium is reduced The pressure reducing means for lowering the temperature, the vehicle interior heat exchanger arranged to communicate with the vehicle interior and exchanging heat between the heat medium and the air in the vehicle interior, and separated from the heat medium by the oil separator On the suction side of the compressor It is characterized by having a to the oil return line, a.

In the present invention configured as described above, the high-temperature heat medium compressed by the compressor is deprived of heat by exchanging heat in the coolant heat exchanger. The heat medium deprived of heat by the coolant heat exchanger is introduced into the oil separator to separate the mixed oil. The oil separated by the oil separator is returned to the suction side of the compressor through the oil return line.
According to the present invention configured as above, since the oil is separated from the heat medium deprived of heat by the coolant heat exchanger, the heat that is sucked in even if the separated oil is returned to the suction side of the compressor. The temperature rise of the medium is small, and the decrease in the volumetric efficiency of the compressor due to the temperature rise of the suction heat medium can be reduced.

According to a second aspect of the present invention, there is provided a vehicle air conditioner mounted on a vehicle having a cooling circuit for circulating a coolant for cooling the vehicle drive means, the compressor for compressing a heat medium; , Heat exchange between the heat medium compressed by this compressor and the coolant, mixed in the coolant heat exchanger that absorbs the heat of the heat medium to the coolant and the heat medium deprived of heat by this coolant heat exchanger An oil separator that separates the oil that is being removed, a heat exchanger that is disposed outside the vehicle compartment and exchanges heat between the heat medium and the outside air, and a pressure reducing unit that reduces the pressure of the heat medium by reducing the pressure of the heat medium And a vehicle interior heat exchanger that is arranged to communicate with the vehicle interior and exchanges heat between the heat medium and the air in the vehicle interior, and the oil separated from the heat medium by the oil separator,
And an oil return pipe that is returned between the vehicle interior heat exchanger and the compressor inlet side.

In the present invention configured as described above, the high-temperature heat medium compressed by the compressor is deprived of heat by exchanging heat in the coolant heat exchanger. The heat medium deprived of heat by the coolant heat exchanger is introduced into the oil separator, and the mixed oil is separated. The oil separated by the oil separator is returned between the vehicle interior heat exchanger and the compressor inlet side through the oil return line.
According to the present invention configured as described above, the oil separator separates the oil from the heat medium that has been deprived of heat by passing through the coolant heat exchanger. Even when returned between the compressor inlet side and the compressor inlet side, the temperature rise of the heat medium sucked into the compressor is small, and the decrease in the volumetric efficiency of the compressor due to the temperature rise of the suction heat medium can be reduced.

  Furthermore, a third aspect of the present invention is a vehicle air conditioner mounted on a vehicle, and is arranged to communicate with a compressor that compresses a heat medium and a passenger compartment, and is compressed by the compressor. An auxiliary vehicle interior heat exchanger that exchanges heat between the heat medium and the air in the vehicle interior; an oil separator that separates oil mixed in the heat medium heat exchanged by the auxiliary vehicle interior heat exchanger; An exterior heat exchanger that is disposed outside the passenger compartment and performs heat exchange between the heat medium and the outside air, a decompression unit that reduces the pressure of the heat medium to lower the temperature, and is disposed so as to communicate with the interior of the passenger compartment. Car interior heat exchanger that exchanges heat between the heat medium and the air in the vehicle interior, and oil that returns the oil separated from the heat medium by the oil separator between the vehicle interior heat exchanger and the compressor inlet side And a return line.

In the present invention configured as described above, the high-temperature heat medium compressed by the compressor is deprived of heat by passing through the auxiliary vehicle compartment heat exchanger. The heat medium that has passed through the auxiliary vehicle compartment heat exchanger is introduced into the oil separator, and the mixed oil is separated. The oil separated by the oil separator is returned between the vehicle interior heat exchanger and the compressor inlet side through the oil return line.
According to the present invention configured as described above, since the oil is separated from the heat medium that has been deprived of heat by passing through the auxiliary vehicle interior heat exchanger, the separated oil is separated from the vehicle interior heat exchanger and the compressor. Even when returning to the pipe line between the inlet sides, the temperature rise of the heat medium sucked into the compressor is small, and the decrease in the volumetric efficiency of the compressor due to the temperature rise of the suction heat medium can be reduced.

Furthermore, a fourth aspect of the present invention is a vehicle air conditioner mounted on a vehicle, the compressor for compressing the heat medium, and the heat exchanger that is disposed outside the passenger compartment and exchanges heat between the heat medium and the outside air. The vehicle exterior heat exchanger for performing the heating, the pressure reducing means for reducing the pressure of the heat medium to reduce the temperature, and the vehicle that is arranged to communicate with the vehicle interior and exchanges heat between the heat medium and the air in the vehicle interior It is characterized by having an indoor heat exchanger and a compressor cooling line extending inside the compressor in order to flow a coolant for cooling the compressor.
In this invention comprised in this way, a compressor is cooled by flowing a coolant through the compressor cooling pipe line extended in the inside of a compressor. Thereby, the efficiency of a compressor can be improved.

In the fourth aspect of the present invention, preferably, the compressor further includes an oil separator built in the compressor, and the compressor cooling pipe cools the oil in the oil separator.
In the fourth invention of the present invention, preferably, it further comprises an oil separator built in the compressor, and an oil return line for returning the oil separated by the oil separator to the suction side of the compressor, The oil return line is cooled by the coolant flowing through the compressor cooling line.
In the fourth aspect of the present invention, preferably, the compressor is a scroll type compressor including a fixed scroll member and an orbiting scroll member, and a compressor cooling conduit is formed in the fixed scroll member.

In the fourth aspect of the present invention, preferably, the compressor cooling pipeline is connected to a vehicle drive means cooling circuit for circulating coolant to cool the vehicle drive means.
According to the present invention configured as described above, it is not necessary to provide a separate cooling circuit for cooling the compressor.

In the present invention, preferably, between the heat medium in the low pressure pipe through which the low pressure heat medium sucked into the compressor flows and the heat medium in the high pressure pipe through which the high pressure heat medium at the outlet of the vehicle exterior heat exchanger flows. Has an internal heat exchanger for heat exchange.
In the present invention, it preferably has an oil return pipe for returning the oil separated from the heat medium by the oil separator between the vehicle interior heat exchanger outlet and the low-pressure side internal heat exchanger inlet.
According to the present invention configured as described above, by returning the separated oil between the vehicle interior heat exchanger and the low-pressure side internal heat exchanger inlet, the temperature rise of the heat medium sucked into the compressor is further increased. The reduction in volumetric efficiency of the compressor due to the small temperature increase of the suction heat medium can be further reduced.

In the present invention, the compressor and the oil separator are preferably connected to each other such that when the vehicle vibrates, there is almost no change in the relative position between them.
According to the present invention configured as described above, since a force for deforming the oil return pipe connected between the compressor and the oil separator does not act, a special anti-vibration measure is applied to the oil return pipe. It is possible to prevent the oil return pipe from being damaged even if it is not performed.
In the present invention, the oil separator is preferably built in the compressor.
In the present invention, the oil separator preferably includes an oil throttle mechanism.
In the present invention configured as described above, the oil throttle mechanism is preferably a multistage orifice.

  In the present invention, preferably, the apparatus further comprises a coolant temperature sensor for measuring the temperature of the coolant, and control means for controlling the compressor based on the temperature of the coolant measured by the coolant temperature sensor. Stops the operation of the compressor when the temperature of the coolant is below a predetermined temperature.

According to the vehicle air conditioner of the present invention, the efficiency of the compressor can be improved.
Moreover, according to the vehicle air conditioner of the present invention, it is possible to prevent the piping from being damaged without taking any special measures for vibration isolation to the piping for returning the oil from the oil separator.

Next, a vehicle air conditioner according to an embodiment of the present invention will be described with reference to the accompanying drawings.
First, with reference to FIG. 1 and 2, the air conditioning apparatus for vehicles of 1st Embodiment of this invention is demonstrated. FIG. 1 is a diagram illustrating a circuit of the vehicle air conditioner according to the first embodiment of the present invention, and FIG. 2 is a Ph diagram illustrating the operation of the vehicle air conditioner according to the present embodiment.
As shown by a broken line in FIG. 1, the vehicle equipped with the vehicle air conditioner 1 according to the first embodiment of the present invention is used for cooling the engine ENG as vehicle driving means and heating the vehicle interior. An engine ENG cooling circuit which is a vehicle driving means cooling circuit is provided. In this engine ENG cooling circuit, the coolant that has cooled the engine ENG enters the radiator R, which is a heat radiating means, through the thermostat T, releases heat to the outside air, and returns to the engine ENG. Further, a part of the coolant of the engine ENG cooling circuit returns to the engine ENG through the heater core H in the vehicle compartment via the thermostat T.

As shown in FIG. 1, a vehicle air conditioner 1 according to a first embodiment of the present invention includes a compressor 2 that compresses a heat medium, and heat exchange between the heat medium compressed by the compressor 2 and a coolant. A coolant heat exchanger 4 that performs cooling, an oil separator 6 that separates lubricating oil that is oil mixed in the heat medium deprived of heat by the coolant heat exchanger 4, and circuits for cooling and heating It has a four-way valve 8 for switching, a vehicle exterior heat exchanger 10 that exchanges heat between the heat medium and the outside air, and a first electronic expansion valve 12 that is a pressure reducing means for reducing the pressure of the heat medium flow path. Furthermore, the vehicle air conditioner 1 includes an internal heat exchanger 14 that exchanges heat between the heat medium flowing in the circuit, a second electronic expansion valve 16 that is a decompression unit that squeezes and decompresses the flow path of the heat medium, A vehicle interior heat exchanger 18 that exchanges heat between the heat medium and the air in the vehicle interior; a gas-liquid separator 20 that separates the inflowing heat medium into a gas phase and a liquid phase and outflows the gas phase heat medium; And an oil return line 22 for returning the lubricating oil separated by the oil separator 6 to the compressor 2. The vehicle air conditioner 1 includes a coolant temperature sensor 24 that measures the temperature of a coolant that cools the engine and a controller 26 that is a control unit in order to control the operation thereof. In this embodiment, CO ₂ that is a supercritical fluid is used as the heat medium.
The compressor 2 compresses the gas phase heat medium flowing out from the internal heat exchanger 14 to increase the pressure, and sends the heat medium to the coolant heat exchanger 4.

The coolant heat exchanger 4 is configured to exchange heat between the high-temperature heat medium compressed by the compressor 2 and the coolant circulating in order to cool the engine ENG. Since the heat medium discharged from the compressor 2 has a higher temperature than the coolant, the heat medium is deprived of heat by the coolant and the temperature is lowered.
The oil separator 6 separates the lubricating oil of the compressor 2 discharged from the compressor 2 and mixed in the heat medium whose temperature has been lowered by the coolant heat exchanger 4 from the heat medium. The heat medium from which the lubricating oil has been removed by the oil separator 6 flows into the four-way valve 8.

  The four-way valve 8 has four outlets 8a, 8b, 8c and 8d. The outlets 8a and 8d, 8b and 8c communicate with each other during cooling, and the outlets 8a and 8b, 8c and 8d pass during heating. Each is switched to communicate. Therefore, in the vehicle air conditioner 1 of the present embodiment, by switching the four-way valve 8, the heat medium is the compressor 2 → the coolant heat exchanger 4 → the oil separator 6 → the outdoor heat exchanger during cooling. 10 → first electronic expansion valve 12 → internal heat exchanger 14 → second electronic expansion valve 16 → vehicle compartment heat exchanger 18 → gas-liquid separator 20 → internal heat exchanger 14 → compressor 2 , Compressor 2 → coolant heat exchanger 4 → oil separator 6 → vehicle compartment heat exchanger 18 → second electronic expansion valve 16 → internal heat exchanger 14 → first electronic expansion valve 12 → exterior heat exchanger 10 → gas-liquid separator 20 → internal heat exchanger 14 → compressor 2 in this order.

The vehicle exterior heat exchanger 10 is disposed outside the vehicle interior, and performs heat exchange between the heat medium flowing inside the vehicle exterior heat exchanger 10 and the outside air. During the cooling, the vehicle exterior heat exchanger 10 is compressed by the compressor 2 to rise in temperature, and the heat medium cooled by the coolant heat exchanger 4 flows in to release heat to the outside air. In addition, during the heating, the vehicle exterior heat exchanger 10 absorbs heat from the outside air by flowing in a heat medium that has been expanded by the first electronic expansion valve 12 and whose temperature has decreased.
The first electronic expansion valve 12 reduces the pressure on the downstream side of the flow of the heat medium by restricting the flow path of the heat medium. The first electronic expansion valve 12 is opened at the time of cooling and does not perform a pressure reducing action. At the time of heating, the first electronic expansion valve 12 reduces the pressure of the heat medium flowing in from the internal heat exchanger 14 and flows out to the vehicle exterior heat exchanger 10. Reduce the temperature.

  The internal heat exchanger 14 exchanges heat between the heat medium that flows between the first electronic expansion valve 12 and the second electronic expansion valve 16 and the heat medium that flows between the gas-liquid separator 20 and the compressor 2. Are arranged as follows. In the present embodiment, both the first electronic expansion valve 12 and the second electronic expansion valve 16 are located between the first and second electronic expansion valves 12 and 16 rather than the heat medium that flows through the low-pressure line between the gas-liquid separator 20 and the compressor 2 during cooling and heating. Since the temperature of the heat medium flowing through the high-pressure line is higher, the heat moves toward the heat medium flowing between the gas-liquid separator 20 and the compressor 2. The amount of heat exchange in the internal heat exchanger 14 is the temperature of the heat medium flowing between the gas-liquid separator 20 and the compressor 2 and the temperature of the heat medium flowing between the first electronic expansion valve 12 and the second electronic expansion valve 16. Since it is proportional to the difference, the smaller the temperature difference of each heat medium, the smaller.

The pressure on the downstream side of the flow of the heat medium is reduced by restricting the flow path of the second electronic expansion valve 16 and the heat medium. The second electronic expansion valve 16 lowers the temperature of the heat medium flowing into the vehicle interior heat exchanger 18 by lowering the pressure of the heat medium flowing in from the internal heat exchanger 14 during cooling, and is opened during heating to reduce the pressure. Does not work.
The vehicle interior heat exchanger 18 is disposed so as to communicate with the vehicle interior, receives the air flow generated by the blower F disposed adjacent thereto, and the heat medium flowing in the vehicle interior heat exchanger 18 and the air in the vehicle interior. Heat exchange between. During cooling, the vehicle interior heat exchanger 18 absorbs heat from the air in the vehicle interior when a heat medium that has been expanded by the second electronic expansion valve 16 and the temperature thereof has decreased. Further, during heating, the vehicle interior heat exchanger 18 is compressed by the compressor 2 to rise in temperature, the heat medium cooled by the coolant heat exchanger 4 flows in, and releases heat to the air in the vehicle interior.

The gas-liquid separator 20 receives the heat medium exchanged by the vehicle interior heat exchanger 18 during cooling, and receives the heat medium exchanged by the vehicle exterior heat exchanger 10 during heating, and converts the heat medium into a gas phase and a liquid. The phases are separated, and the gas phase heat medium flows out to the internal heat exchanger 14.
The oil return pipe 22 is connected between the oil separator 6 and the compressor 2 in order to return the lubricating oil separated from the heat medium by the oil separator 6 to the pipe on the suction side of the compressor 2. . In addition, the oil return pipe 22 is configured by an elongated capillary pipe in order to prevent the high-pressure heat medium in the oil separator 6 from flowing back to the compressor 2 through the oil return pipe 22.
As a modification, the oil return line 22 may be configured to return the separated lubricating oil between the vehicle interior heat exchanger 18 and the compressor 2 inlet side.

    The coolant temperature sensor 24 is disposed in the coolant pipe so as to measure the temperature of the coolant circulating between the engine ENG and the heater core H. The coolant temperature sensor 26 is configured to output an electrical signal corresponding to the measured temperature to the controller 26.

  The controller 26 is configured to input the electric signal output from the coolant temperature sensor 24 and control the compressor 2 according to a preset control program. Specifically, the controller 26 is configured to stop the operation of the compressor 2 when the temperature measured by the coolant temperature sensor 24 is equal to or lower than a predetermined temperature. The controller 26 is an A / D converter (not shown) that converts an electrical signal input from each sensor into a digital signal, and a CPU (not shown) that determines whether to operate or stop the compressor based on the converted digital signal. 1), a ROM (not shown) that stores a program for operating the CPU, and a D / A converter (not shown) that converts a digital signal obtained as a result of the operation of the CPU into an analog signal.

Next, with reference to FIG. 2, the effect | action of the vehicle air conditioner 1 of 1st Embodiment of this invention is demonstrated. First, an operation when the vehicle air conditioner 1 performs a cooling operation will be described. When performing the cooling operation, the four-way valve 8 is switched so that the outflow inlets 8a and 8d, and 8b and 8c communicate with each other. In addition, the first electronic expansion valve 12 is opened, and the first electronic expansion valve 12 is not decompressed. When the vehicle air conditioner 1 is operated, the compressor 2 rotates, and the heat medium in the state of point A in FIG. The heat medium compressed by the compressor 2 increases in pressure P and becomes a state of point B which is a supercritical state. At this time, a part of the energy added to the heat medium by the compressor 2 becomes the internal energy of the heat medium, so that the enthalpy h also increases. The heat medium discharged from the compressor 2 is mixed with lubricating oil that lubricates the compressor 2 and seals the sliding portion. The heat medium compressed by the compressor 2 flows into the coolant heat exchanger 4, where heat is exchanged with the coolant circulating in the engine ENG cooling circuit, and the state becomes point B1. In this embodiment, the temperature of the heat medium discharged from the compressor 2 is about 130 ° C., and the temperature of the coolant in a steady state is about 90 ° C. Therefore, the heat medium takes heat away from the coolant. The temperature drops. In the present embodiment, the temperature of the heat medium is lowered to about 30 ° C. by performing heat exchange. The heat medium exchanged by the coolant heat exchanger 4 flows into the oil separator 6 and the lubricating oil mixed in the heat medium is removed. The heat medium from which the lubricating oil has been removed by the oil separator 6 flows into the four-way valve 8 from the outflow port 8a and flows out from the outflow port 8d. The heat medium that has passed through the four-way valve 8 flows into the vehicle exterior heat exchanger 10 and is deprived of heat by the outside air, so that the enthalpy h is reduced to a state of point C1.
On the other hand, the lubricating oil separated from the heat medium by the oil separator 6 is returned to the suction side of the compressor 2 through the oil return line 22. Further, since the oil return pipe 22 is formed so as to have a sufficiently large flow resistance, the heat medium does not flow from the oil separator 6 having a high pressure to the suction side of the compressor 2 having a low pressure.

  The heat medium exchanged by the vehicle exterior heat exchanger 10 flows into the first electronic expansion valve 12. Since the first electronic expansion valve 12 is open, the pressure of the heat medium that has passed through the first electronic expansion valve 12 does not change, and the heat medium in the state of the point C1 flows into the internal heat exchanger 14 as it is. The heat medium flowing on the other side of the internal heat exchanger 14 is in the state of point E, and since the temperature is lower than that of the heat medium in the state of point C1, it flows into the internal heat exchanger 14 from the first electronic expansion valve 12. The heat medium is deprived of heat and the enthalpy h is reduced to a point C state. The heat medium exchanged by the internal heat exchanger 14 is reduced in pressure by passing through the second electronic expansion valve 16 to be in a state of a gas-liquid two-phase point D, and the temperature is lowered. The heat medium whose temperature has decreased after passing through the second electronic expansion valve 16 enters the vehicle interior heat exchanger 18 and absorbs heat from the air in the vehicle interior. As a result, the air in the passenger compartment is cooled, and the enthalpy h is increased to a point E while the heat medium flowing in the passenger compartment heat exchanger 18 is vaporized. The heat medium in the state of point E flows into the four-way valve 8 from the outflow inlet 8b and out of the outflow inlet 8c. The heat medium that has passed through the four-way valve 8 enters the gas-liquid separator 20, and the liquid phase component of the heat medium is removed. The heat medium from which the liquid phase components have been removed by the gas-liquid separator 20 flows into the internal heat exchanger 14. As described above, the heat medium in the state of point E flowing into the internal heat exchanger 14 from the gas-liquid separator 20 is in the state of point C1 flowing into the second internal heat exchanger 14 from the first electronic expansion valve 12. Since the temperature is lower than that of the heat medium, the heat medium in the state of point E absorbs heat and the enthalpy h increases, returns to the state of point A, and one cycle is completed. The enthalpy h from which the heat medium in the state of the point C1 is lost in the internal heat exchanger 14 is substantially equal to the enthalpy h obtained in the state of the point E in the internal heat exchanger 14, and therefore, the length between the points C1 and C. And the length between the points EA are substantially equal. As a modified example, a heat medium partially including a liquid phase may be discharged in the gas-liquid separator 20.

  Next, the operation of the engine ENG cooling circuit for cooling the engine ENG will be described. When the engine ENG is started, the coolant for cooling the engine is circulated through a first path that passes through the engine ENG → the thermostat T → the coolant heat exchanger 4 → the heater core H → the engine ENG. The temperature of the circulating coolant is measured by the coolant temperature sensor 24 and sent to the controller 26. When the temperature of the coolant rises to a predetermined temperature after the engine ENG starts, the thermostat T switches the pipe line so that the coolant is also circulated in the second path passing through the engine ENG → the thermostat T → the radiator R → the engine ENG. . The coolant passing through the first path flows from the engine ENG through the thermostat T into the coolant heat exchanger 4. In the coolant heat exchanger 4, the coolant absorbs the heat of the heat medium discharged from the compressor and lowers the temperature of the heat medium. The coolant that has absorbed heat by the coolant heat exchanger 4 flows into the heater core H. During the cooling operation, the damper H1 of the heater core H is closed so that the heat of the coolant does not warm the air in the passenger compartment, so that the airflow generated by the blower F does not pass through the heater core H. Further, during the heating operation, the damper H1 is opened, and the heat of the coolant is released into the air flow generated by the blower F, thereby warming the air in the passenger compartment. For this reason, during heating, the heat absorbed by the coolant from the heat medium in the coolant heat exchanger 4 is used for heating. The coolant that has passed through the heater core H returns to the engine ENG. The coolant passing through the second path flows from the engine ENG through the thermostat T to the radiator R, releases heat to the outside air by the radiator, and returns to the engine ENG. Further, the coolant heat exchanger 4 may be disposed between the engine ENG and the thermostat T.

  Next, control of the compressor 2 by the controller 26 will be described. The temperature of the coolant flowing through the engine cooling circuit is measured by the coolant temperature sensor 24 and sent to the controller 26. When the temperature measured by the coolant temperature sensor 24 is lower than the predetermined temperature, the controller 26 generates a signal for prohibiting the operation of the compressor 2 and controls the compressor 2 not to start. This is because when the heat medium is at a low temperature, the lubricating oil has a high viscosity, and the lubricating oil flow from the oil separator to the compressor 2 is reduced. Alternatively, this is to prevent the compressor 2 from being damaged due to liquid compression in the compressor 2. In the present embodiment, the controller 26 prohibits the operation of the compressor 2 when the temperature measured by the coolant temperature sensor 24 is 0 ° C. or lower. Preferably, when the temperature measured by the coolant temperature sensor 24 is 0 to 20 ° C., the operation of the compressor 2 is controlled to be prohibited.

  Next, an effect | action at the time of the air conditioning apparatus 1 for vehicles of 1st Embodiment of this invention performing heating operation is demonstrated. First, the heat medium in the state of point A in FIG. 2 is compressed by the compressor 2 to be in the state of point B. The heat medium passes through the coolant heat exchanger 4 and enters the state of point B1, and further passes through the oil separator 6 and the vehicle interior heat exchanger 18 to enter the state of point C1. Next, the state of point C is reached through the second electronic expansion valve (opened) and the internal heat exchanger 14. Furthermore, it will be in the state of the point D through the 1st electronic expansion valve 12, and will be in the state of the point E through the vehicle exterior heat exchanger 10. Next, the state returns to the point A through the gas-liquid separator 20 and the internal heat exchanger 14. Since the operation in the internal heat exchanger 4 and the oil separator 6 is the same as that in the cooling operation, the description thereof is omitted.

  According to the vehicle air conditioner 1 of the first embodiment of the present invention, after the high-temperature heat medium discharged from the compressor 2 is cooled by the coolant heat exchanger 4, the lubricating oil is removed from the heat medium by the oil separator 6. Since the oil is separated, the temperature of the lubricating oil returning from the oil separator 6 to the suction side of the compressor 2 is low, and a decrease in volumetric efficiency of the compressor 2 can be reduced.

  Further, as a modification of the first embodiment of the present invention, the compressor 2 and the oil separator 6 may be configured integrally. That is, as shown in FIG. 3, the compressor 2 has a heat medium suction port 2a, a compression unit 2b, a discharge port 2c, and a motor 2d for driving the compressor 2, and further includes an oil separator 6 Are integrally formed. The coolant heat exchanger 4 is fastened to the casing of the compressor 2 with bolts. In this modification, the heat medium is sucked from the suction port 2a, compressed by the compression unit 2b, and then flows into the first internal heat exchanger 4 coupled to the compressor 2, where heat is taken away by the coolant. The heat medium that has been deprived of heat by the coolant heat exchanger 4 and has fallen in temperature again enters the oil separator 6 in the casing of the compressor 2, removes the lubricating oil, and is discharged from the discharge port 2 c. The lubricating oil separated by the oil separator 6 returns to the suction port 2a through the oil return line 22. In this modification, the compressor 2 and the oil separator 6 are integrally formed. Therefore, even when the vehicle on which the vehicle air conditioner 1 is mounted vibrates, the compressor 2 and the oil separator 6 are relative to each other. Therefore, the oil return line 22 connected between the compressor 2 and the oil separator 6 is not deformed. Thereby, it is not necessary to take special anti-vibration measures for preventing the oil return pipeline 22 from being damaged. Moreover, in this modification, since the compressor 2 and the oil separator 6 are integrally formed, a pipe line connecting the compressor 2 and the oil separator 6 can be omitted, and the vehicle air conditioner The overall weight of 1 can be reduced.

  Next, a vehicle air conditioner according to a second embodiment of the present invention will be described with reference to FIG. The vehicle air conditioner of this embodiment differs from the first embodiment in that the heat medium compressed by the compressor is heat-exchanged by the auxiliary vehicle compartment heat exchanger and then introduced into the oil separator. Therefore, here, the same reference numerals are assigned to the same components as those in the first embodiment, and the description thereof will be omitted, and only the parts different from the first embodiment will be described. FIG. 4 is a diagram illustrating a circuit of the vehicle air conditioner according to the second embodiment of the present invention.

  As shown in FIG. 4, the vehicle air conditioner 30 according to the second embodiment of the present invention exchanges heat between the compressor 2, the heat medium compressed by the compressor 2, and the air in the passenger compartment. Auxiliary vehicle interior heat exchanger 32, an oil separator 6 that separates lubricating oil mixed in the heat medium heat-exchanged by this auxiliary vehicle interior heat exchanger 32, a four-way valve 8, and a vehicle exterior heat exchanger 10. And a first electronic expansion valve 12. Furthermore, the vehicle air conditioner 30 includes an internal heat exchanger 14, a second electronic expansion valve 16, a vehicle interior heat exchanger 18, a gas-liquid separator 20, and an oil return line 22.

  The four-way valve 8 has four outlets 8a, 8b, 8c and 8d. The outlets 8a and 8d, 8b and 8c communicate with each other during cooling, and the outlets 8a and 8b, 8c and 8d pass during heating. Each is switched to communicate. Accordingly, by switching the four-way valve 8 in the vehicle air conditioner 30 of the present embodiment, the heat medium is the compressor 2 → the auxiliary vehicle interior heat exchanger 32 → the oil separator 6 → the vehicle exterior heat during cooling. Exchanger 10 → first electronic expansion valve 12 (open) → internal heat exchanger 14 → second electronic expansion valve 16 → vehicle interior heat exchanger 18 → gas-liquid separator 20 → internal heat exchanger 14 → compressor 2 During heating, the compressor 2 → the auxiliary vehicle interior heat exchanger 32 → the oil separator 6 → the vehicle interior heat exchanger 18 → the second electronic expansion valve 16 (open) → the internal heat exchanger 14 → first It flows in the order of the electronic expansion valve 12 → the vehicle exterior heat exchanger 10 → the gas-liquid separator 20 → the internal heat exchanger 14 → the compressor 2.

The auxiliary vehicle interior heat exchanger 32 is disposed so as to communicate with the vehicle interior, and performs heat exchange between the airflow generated by the blower F and the heat medium. The auxiliary vehicle interior heat exchanger 32 has a damper 32a for blocking the air flow generated by the blower F, and when the auxiliary vehicle interior heat exchanger 32 does not perform heat exchange, the damper 32a is closed. Airflow is prevented from passing through the auxiliary vehicle interior heat exchanger 32. Since the high-temperature heat medium compressed by the compressor 2 flows into the auxiliary vehicle compartment heat exchanger 32, the damper 32a is closed during the cooling operation so that heat exchange is not performed in the auxiliary vehicle compartment heat exchanger 32. .
The oil separator 6 is configured to separate the lubricating oil mixed in the heat medium that has passed through the auxiliary vehicle interior heat exchanger 32. The lubricating oil separated by the oil separator 6 is returned to the outlet of the gas-liquid separator 20 through the oil return line 22.

  In the vehicle air conditioner 30 of the present embodiment, during the heating operation, the temperature of the high-temperature heat medium compressed by the compressor 2 is decreased by performing heat exchange in the auxiliary vehicle interior heat exchanger 32, and the temperature Since the lubricating oil is separated by the oil separator 6 from the heat medium having decreased, the temperature of the lubricating oil returned to the low pressure side by the oil return line 22 is lowered. Further, since heat is not exchanged in the auxiliary vehicle interior heat exchanger 32 during the cooling operation, the temperature of the heat medium does not greatly decrease even if it passes through the auxiliary vehicle indoor heat exchanger 32. In the pipe line from the compressor 2 to the oil separator 6 through the auxiliary vehicle interior heat exchanger 32, the temperature slightly decreases. Further, even if the lubricating oil separated by the oil separator 6 has a high temperature, the lubricating oil returned to the outlet of the gas-liquid separator 20 by the oil return line 22 is mixed with a low-temperature heat medium, and the low temperature After the heat medium is heated, it passes through the internal heat exchanger 14, so the amount of heat exchange in the internal heat exchanger 14 decreases. Thereafter, since the air is sucked into the compressor 2, the temperature of the heat medium sucked into the compressor 2 is not greatly increased.

According to the vehicle air conditioner 30 of the second embodiment of the present invention, the temperature of the high-temperature heat medium discharged from the compressor 2 is decreased by the auxiliary vehicle interior heat exchanger 32 and then heated by the oil separator 6. Since the lubricating oil is separated from the medium, the temperature of the lubricating oil returning from the oil separator 6 to the outlet of the gas-liquid separator 20 is low, and the reduction in volumetric efficiency of the compressor 2 can be reduced.
Further, during the heating operation, the amount of heat of the lubricating oil in the auxiliary vehicle interior heat exchanger 32 is also absorbed by the air in the vehicle interior, so that the heat of the lubricating oil can be used for heating.
As a modification, as shown by a two-dot chain line in FIG. 4, the oil return pipeline 22 can be configured to return the separated lubricating oil to the pipeline on the inlet side of the gas-liquid separator.

  Next, a vehicle air conditioner according to a third embodiment of the present invention will be described with reference to FIGS. The vehicle air conditioner of the present embodiment is different from the above-described embodiment in that a compressor cooling conduit for flowing a coolant is formed in the compressor and the compressor is cooled by the coolant. Therefore, here, the same reference numerals are assigned to the same components as those in the first embodiment, and the description thereof will be omitted, and only the parts different from the first embodiment will be described. FIG. 5 is a diagram showing a circuit of a vehicle air conditioner according to a third embodiment of the present invention. FIG. 6 is a cross-sectional view of a compressor used in the vehicle air conditioner of the present embodiment, and FIG. 7 is an enlarged cross-sectional view of an oil throttle mechanism used as an oil return line in the compressor. .

  As shown in FIG. 5, the vehicle air conditioner 40 according to the third embodiment of the present invention includes a compressor 2, a four-way valve 8, a vehicle exterior heat exchanger 10, a first electronic expansion valve 12, an internal The heat exchanger 14, the second electronic expansion valve 16, the vehicle interior heat exchanger 18, and the gas-liquid separator 20 are included. Further, as shown in FIG. 6, the compressor 2 includes an oil separator 6 and an oil return line 22, and a compressor cooling line 42 is formed inside the compressor 2. Has been.

  The four-way valve 8 has four outlets 8a, 8b, 8c and 8d. The outlets 8a and 8d, 8b and 8c communicate with each other during cooling, and the outlets 8a and 8b, 8c and 8d pass during heating. Each is switched to communicate. Accordingly, by switching the four-way valve 8 in the vehicle air conditioner 40 of the present embodiment, the heat medium is the compressor 2 → the oil separator 6 → the outdoor heat exchanger 10 → the first electronic expansion during cooling. The valve 12 (open) → the internal heat exchanger 14 → the second electronic expansion valve 16 → the vehicle interior heat exchanger 18 → the gas-liquid separator 20 → the internal heat exchanger 14 → the compressor 2 flows in this order. Compressor 2 → oil separator 6 → interior heat exchanger 18 → second electronic expansion valve 16 (open) → internal heat exchanger 14 → first electronic expansion valve 12 → outdoor heat exchanger 10 → gas-liquid separator 20 → Internal heat exchanger 14 → the compressor 2 flows in this order.

  As shown in FIG. 6, the compressor 2 used in the present embodiment is compressed by the suction port 2a, the compression unit 2b that compresses the heat medium sucked from the suction port 2a, and the compression unit 2b. This is a scroll compressor having an oil separator 6 that receives the heat medium, and a discharge port 2c that discharges the heat medium from which the lubricating oil as oil has been removed by the oil separator 6. The compression part 2b has the turning scroll member 2e rotated by the motor 2d, and the fixed scroll member 2f fixed in the housing | casing of a compressor. The orbiting scroll member 2e includes an orbiting disk 2g that is connected to the motor 2d and is rotationally driven, and a spiral orbiting spiral body 2h provided on the orbiting disk 2g. The fixed scroll member 2f includes a fixed disk 2j fixed to the casing of the compressor, and a spiral fixed spiral body 2k provided on the fixed disk 2j and meshing with the swirl spiral body 2h. . The swirl spiral body 2h and the fixed spiral body 2k are formed such that their side surfaces are in line contact at a plurality of locations. Further, a compressor cooling conduit 42 for flowing coolant is formed inside the fixed disk 2j of the fixed scroll member 2f.

An oil separator 6 is provided inside the compressor 2 so as to communicate with the compression unit 2b. The oil separator 6 includes a drooping pipe 6a that hangs down from the discharge port 2c of the compressor 2, and an oil retaining chamber 6b that is provided below the drooping pipe 6a. Further, an oil return line 22 is formed inside the compressor 2 so as to communicate the bottom of the oil retaining chamber 6b and the bottom of the compression unit 2b.
As shown in FIG. 7, the oil return line 22 includes a plurality of orifice members 22 a each having a small hole in the center of a disk in a circular cross-section formed in the casing of the compressor 2. It is comprised by the annular packing member 22b arrange | positioned between each orifice member 22a, and the retaining ring member 22c which fixes these in a pipe line. Thus, the oil return line 22 constituted by the multistage orifice functions as an oil throttle mechanism.

  Next, the operation of the vehicle air conditioner 40 according to the third embodiment of the present invention will be described. As shown in FIG. 5, an engine ENG cooling circuit is provided in a vehicle on which the vehicle air conditioner 40 according to the third embodiment of the present invention is mounted. In this engine ENG cooling circuit, the coolant that has cooled the engine ENG enters the radiator R, which is a heat radiating means, through the thermostat T, releases heat to the outside air, and returns to the engine ENG. Further, a part of the coolant of the engine ENG cooling circuit returns to the engine ENG through the thermostat T, the compressor cooling pipeline 42 and the heater core H in the vehicle interior. Further, the coolant heat exchanger 4 may be disposed between the engine ENG and the thermostat T.

  First, when the vehicle air conditioner 40 of this embodiment is operated, the motor 2d of the compressor 2 is driven. The heat medium sucked into the compressor 2 from the suction port 2a flows into the peripheral portion of the compressor 2b of the compressor 2. The swirl spiral body 2h and the fixed spiral body 2k are formed such that their side surfaces are in line contact at a plurality of locations. When the swirl spiral body 2h is swirled by driving the motor 2d, the position of the line contact is determined. Moving. A space surrounded by two places where the swirl spiral body 2h and the fixed spiral body 2k are in line contact is a sealed space P1, in which the heat medium can be compressed. The heat medium that has entered between the swirling spiral body 2h and the fixed spiral body 2k around the compression section 2b is confined in the sealed space P1 when the swirling spiral body 2h is rotationally driven by the motor 2d. That is, the swirl spiral body 2h and the fixed spiral body 2k are confined between the portions in line contact. The sealed space P1 formed in the vicinity of the outer periphery of the compression unit 2b decreases in volume while moving to the inner periphery with the rotation of the swirl spiral body 2h, and the heat medium is compressed. The compressed heat medium is discharged from the opening 2m provided near the center of the fixed disk 2j.

  The heat medium discharged from the opening 2m of the compression unit 2b enters the oil separator 6, and once descends, ascends in the drooping pipe 6a, and is discharged from the discharge port 2c of the compressor 2a. On the other hand, the lubricating oil mixed in the heat medium falls below the drooping pipe 6a and accumulates in the oil retaining chamber 6b. The flow rate of the lubricating oil collected in the oil retaining chamber 6b is limited by the multistage orifice which is the oil return pipe 22 provided at the bottom of the oil retaining chamber 6b, and returns to the bottom of the compression portion 2b. The lubricating oil that has returned to the compression unit 2b lubricates the line contact portion between the swirl spiral body 2h and the fixed spiral body 2k, and also seals the line contact portion.

On the other hand, the coolant flowing through the engine ENG cooling circuit is guided to the compressor cooling pipe 42 formed in the fixed scroll member 2 f of the compressor 2, absorbs the heat of the compressor 2, and is introduced into the heater core H. . In the compressor 2 that has released heat to the coolant that flows through the compressor cooling pipe 42, the temperature of the compression section 2b decreases, and the temperature of the heat medium that is compressed there also decreases.
The heat medium discharged from the discharge port 2c of the compressor 2 flows into the four-way valve 8 and circulates through the circuit of the heat medium. Since the circulation of the heat medium is the same as that of the first embodiment, the description thereof is omitted.

  According to the vehicle air conditioner 40 of the third embodiment of the present invention, since the coolant flows through the compressor cooling pipe 42 to cool the compression portion 2b of the compressor 2, the volume of the compressor 2 is reduced. Efficiency can be improved. Moreover, since the temperature of the heat medium discharged from the compressor 2 also falls, the reliability of the compressor 2 can be improved. Furthermore, since the compressor cooling pipeline 42 is formed inside the fixed scroll member 2f, the mechanism of the compressor 2 is not complicated. Further, since the oil return pipeline 22 is built in the compressor 2, it is possible to prevent the oil return pipeline 22 from being damaged due to vehicle vibration or the like. Furthermore, since the coolant that has absorbed heat from the compressor 2 is guided to the heater core H, the heat of the compressor can be used for heating.

  In the third embodiment of the present invention, the coolant flowing through the engine ENG cooling circuit is introduced into the compressor cooling pipeline 42 to cool the compressor 2. However, as a modification, the compressor 2 is cooled. Therefore, a separate cooling circuit may be provided. In the above-described embodiment, the multistage orifice is used as the mechanism for reducing the flow rate of the oil. However, any type of restriction mechanism can be used. Furthermore, in the above-described embodiment, the compressor 2b is cooled by the compressor cooling pipe 42. However, as a modification, the compressor cooling pipe 42 is formed in the vicinity of the oil separator 6, and oil is separated by coolant. The vessel 6 can also be configured to cool. Alternatively, as another modification, the compressor cooling pipe line 42 is formed in the vicinity of the oil return pipe line 22 or around the oil return pipe line 22 so that the oil return pipe line 22 is cooled by the coolant. You can also. In this modification, the suction overheating of the compressor 2 due to the lubricating oil can be reduced, so that the volume efficiency of the compressor 2 can be improved. Furthermore, in the above-described embodiment, the compressor 2 and the oil separator 6 are integrally configured. However, as a modification, the compressor 2 and the oil separator 6 are separately configured, and the oil throttle mechanism is an oil separator. 6 may be incorporated.

  As mentioned above, although preferable embodiment of this invention was described, a various change can be added to embodiment mentioned above. In particular, in the above-described embodiment, the vehicle air conditioner of the present invention is mounted on a vehicle driven by an engine. However, the vehicle air conditioner of the present invention can be applied to any vehicle such as an electric vehicle driven by a motor. The device can be installed. In the above-described embodiment, carbon dioxide is used as the heat medium. However, the present invention can be applied to a vehicle air conditioner using any heat medium. Moreover, in embodiment mentioned above, although the internal heat exchanger is used, an internal heat exchanger can be abbreviate | omitted.

It is a figure showing the circuit of the air harmony device for vehicles of a 1st embodiment of the present invention. It is a Ph diagram which shows the effect | action of the vehicle air conditioner of 1st Embodiment of this invention. It is sectional drawing which shows the modification of the compressor used for the air conditioning apparatus for vehicles of 1st Embodiment of this invention. It is a figure which shows the circuit of the air conditioning apparatus for vehicles of 2nd Embodiment of this invention. It is a figure which shows the circuit of the air conditioning apparatus for vehicles of 3rd Embodiment of this invention. It is sectional drawing of the compressor currently used for the air conditioning apparatus for vehicles of 3rd Embodiment of this invention. It is an expanded sectional view of the oil throttle mechanism used for the compressor of FIG.

Explanation of symbols

ENG Engine 1 Air conditioner for vehicle according to the first embodiment of the present invention 2 Compressor 4 First internal heat exchanger 6 Oil separator 8 Four-way valve 10 Car exterior heat exchanger 12 First electronic expansion valve 14 Second internal heat Exchanger 16 Second electronic expansion valve 18 Interior heat exchanger 20 Gas-liquid separator 22 Oil return line 24 Coolant temperature sensor 26 Controller

Claims (17)

A vehicle air conditioner mounted on a vehicle provided with a cooling circuit for circulating a coolant for cooling the vehicle drive means,
A compressor for compressing the heat medium;
A heat exchanger that exchanges heat between the heat medium compressed by the compressor and the coolant, and absorbs the heat of the heat medium into the coolant; and
An oil separator that separates oil mixed in the heat medium deprived of heat by the coolant heat exchanger;
An exterior heat exchanger that is disposed outside the passenger compartment and exchanges heat between the heat medium and the outside air;
Pressure reducing means for reducing the pressure of the heat medium to lower the temperature;
A vehicle interior heat exchanger that is arranged to communicate with the vehicle interior and exchanges heat between the heat medium and the air in the vehicle interior;
An oil return line for returning the oil separated from the heat medium by the oil separator to the suction side of the compressor;
A vehicle air conditioner characterized by comprising: A vehicle air conditioner mounted on a vehicle provided with a cooling circuit for circulating a coolant for cooling the vehicle drive means,
A compressor for compressing the heat medium;
A heat exchanger that exchanges heat between the heat medium compressed by the compressor and the coolant, and absorbs the heat of the heat medium into the coolant; and
An oil separator that separates oil mixed in the heat medium deprived of heat by the coolant heat exchanger;
An exterior heat exchanger that is disposed outside the passenger compartment and exchanges heat between the heat medium and the outside air;
Pressure reducing means for reducing the pressure of the heat medium to lower the temperature;
A vehicle interior heat exchanger that is arranged to communicate with the vehicle interior and exchanges heat between the heat medium and the air in the vehicle interior;
An oil return line for returning the oil separated from the heat medium by the oil separator between the vehicle interior heat exchanger and the compressor inlet side;
A vehicle air conditioner characterized by comprising: A vehicle air conditioner mounted on a vehicle,
A compressor for compressing the heat medium;
An auxiliary vehicle interior heat exchanger that is arranged to communicate with the vehicle interior and exchanges heat between the heat medium compressed by the compressor and the air in the vehicle interior;
An oil separator that separates oil mixed in the heat medium heat-exchanged by the auxiliary vehicle interior heat exchanger;
An exterior heat exchanger that is disposed outside the passenger compartment and exchanges heat between the heat medium and the outside air;
Pressure reducing means for reducing the pressure of the heat medium to lower the temperature;
A vehicle interior heat exchanger that is arranged to communicate with the vehicle interior and exchanges heat between the heat medium and the air in the vehicle interior;
An oil return line for returning the oil separated from the heat medium by the oil separator between the vehicle interior heat exchanger and the compressor inlet side;
A vehicle air conditioner characterized by comprising: A vehicle air conditioner mounted on a vehicle,
A compressor for compressing the heat medium;
An exterior heat exchanger that is disposed outside the passenger compartment and exchanges heat between the heat medium and the outside air;
Pressure reducing means for reducing the pressure of the heat medium to lower the temperature;
A vehicle interior heat exchanger that is arranged to communicate with the vehicle interior and exchanges heat between the heat medium and the air in the vehicle interior;
A compressor cooling line extending inside the compressor to flow coolant for cooling the compressor;
A vehicle air conditioner characterized by comprising:   The vehicle air conditioner according to claim 4, further comprising an oil separator built in the compressor, wherein the compressor cooling pipe cools oil in the oil separator.   Furthermore, an oil separator built in the compressor, and an oil return pipe for returning the oil separated by the oil separator to the suction side of the compressor, and by a coolant flowing through the compressor cooling pipe The vehicle air conditioner according to claim 4, wherein the oil return pipe line is cooled.   7. The compressor according to claim 4, wherein the compressor is a scroll-type compressor including a fixed scroll member and an orbiting scroll member, and the compressor cooling pipe is formed in the fixed scroll member. The vehicle air conditioning apparatus described.   The vehicle air conditioner according to any one of claims 4 to 7, wherein the compressor cooling pipe line is connected to a vehicle driving means cooling circuit for circulating a coolant to cool the vehicle driving means.   Internal heat exchange that exchanges heat between the heat medium in the low-pressure pipe through which the low-pressure heat medium sucked into the compressor flows and the heat medium in the high-pressure pipe through which the high-pressure heat medium at the outlet of the vehicle exterior heat exchanger flows The vehicle air conditioner according to any one of claims 1 to 3, further comprising a container.   The vehicle air conditioner according to claim 9, further comprising an oil return pipe for returning the oil separated from the heat medium by the oil separator between the vehicle interior heat exchanger outlet and the low pressure side internal heat exchanger inlet. .   The cooling operation and the heating operation switching can be switched, and in any operation, the heat medium flows in the order of the coolant heat exchanger and the oil separator. Air conditioner for vehicles.   The cooling operation and the heating operation switching can be switched, and the heating medium flows in the order of the auxiliary vehicle compartment heat exchanger and the oil separator in any operation, according to any one of claims 3, 9, and 10. Air conditioner for vehicles.   11. The compressor according to claim 1, wherein the compressor and the oil separator are connected to each other so that a relative position between the compressor and the oil separator is not substantially changed when the vehicle vibrates. The vehicle air conditioning apparatus described.   The vehicle air conditioner according to any one of claims 1, 9, and 10, wherein the oil separator is built in the compressor.   The vehicle air conditioner according to any one of claims 1 to 3, 9, 10, 11, 12, 13, and 14, wherein the oil separator includes an oil throttle mechanism.   The vehicle air conditioner according to claim 15, wherein the oil throttle mechanism is a multistage orifice.   Furthermore, it has a coolant temperature sensor for measuring the temperature of the coolant, and a control means for controlling the compressor based on the coolant temperature measured by the coolant temperature sensor. The vehicle air conditioner according to any one of claims 1, 2, 4, 8, 9, 10, 11, and 12, wherein the operation of the compressor is stopped when the temperature is equal to or lower than a predetermined temperature.

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