JP2002225545A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide extremely excellent dehumidification and heating performance by rapidly increasing and stablizing a compressor outlet pressure of a refrigerant. SOLUTION: A sub-evaporator 8 as an auxiliary heat exchanger and a sub- condenser 7 as the heat exchanger of the interior of a vehicle for heat emission are arranged at a location where heat from a heater core 21 as a heat generating means can be received in an air route P1 of the interior of the vehicle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioner for adjusting a temperature environment in a vehicle cabin.

[0002]

2. Description of the Related Art As a vehicle air conditioner for adjusting a temperature environment in a vehicle cabin, there is known an air conditioner using a heat pump type refrigeration cycle as disclosed in, for example, Japanese Patent Application Laid-Open No. 7-101227. ing.

[0003] In this method, a sub-condenser is provided downstream of an evaporator provided in an air passage in a vehicle compartment, and cooling water for a vehicle motor is supplied to a heating medium in a refrigerant pipe between the evaporator and a compressor. In the cooling operation, a refrigerant is introduced from the main condenser to the evaporator via the sub-condenser during the cooling operation, and the refrigerant discharged from the compressor bypasses the main condenser during the heating operation. The cycle is switched to a cycle to be introduced into the evaporator via the evaporator.

[0004]

However, in the conventional vehicle air conditioner, it is assumed that the vehicle prime mover is an electric motor, and the temperature of the vehicle prime mover cooling water introduced into the heater is increased. Is stable at about 30 degrees, so that appropriate heating performance can be obtained. However, when the vehicle engine is an internal combustion engine such as a gasoline engine, the vehicle engine cooling water temperature rises to about 80 degrees. Therefore, during the heating operation after the completion of warming-up, the temperature of the heater is too high, and the refrigerant pressure is excessively increased due to the addition of an excessive amount of heat to the refrigerant, and the circulation system is damaged. There is fear. As a method to prevent this, it is only necessary to control the amount of cooling water of the vehicle prime mover or control the amount of introduced air between the outside air and the inside air. In addition, if the amount of outside air and inside air is controlled, the heat load of the evaporator will fluctuate when low-temperature outside air is introduced, and the heating performance will drop sharply. And fine-grained control was needed.

Accordingly, the present invention provides a dehumidifying and heating performance without being involved in switching between the outside air and the inside air,
It is an object of the present invention to provide a vehicle air conditioner capable of performing a rapid dehumidifying and heating operation even after being left in low-temperature outside air for a long time.

[0006]

According to the first aspect of the present invention,
In order to solve the above-mentioned problems, in a vehicle air conditioner that adjusts a temperature environment in a vehicle compartment, a compressor that compresses a refrigerant; a vehicle exterior heat exchanger that releases heat of the refrigerant introduced from the compressor to outside air; A heat-dissipating vehicle interior heat exchanger disposed in the indoor air flow path for releasing heat of the refrigerant introduced from the compressor to the blast air; and a heat-dissipating vehicle interior heat exchange disposed in the vehicle interior air flow path. An auxiliary heat exchanger that transfers heat to a refrigerant introduced from the heat exchanger and flowing through the interior, and a heat exchanger that is disposed in the vehicle interior air flow path and absorbs heat of the blown air by the refrigerant introduced from the exterior heat exchanger. A heat absorbing vehicle interior heat exchanger; first expansion means for expanding a refrigerant introduced from the vehicle exterior heat exchanger to the heat absorbing vehicle interior heat exchanger; and the auxiliary from the heat releasing vehicle interior heat exchanger. Refrigerant introduced into heat exchanger A second expansion unit configured to expand, and a heating unit disposed in a vehicle interior air flow path, wherein the heat absorption vehicle interior heat exchanger includes the heat radiation vehicle interior heat exchanger and the auxiliary heat exchanger. The heat dissipating vehicle interior heat exchanger and the auxiliary heat exchanger are disposed upstream of the heat generating means in the vehicle interior air flow path, and are disposed at positions where the heat from the heat generating means can be received. It is a vehicle air conditioner having a gist.

According to a second aspect of the present invention, there is provided an air conditioner for a vehicle according to the first aspect, wherein the compressor, the heat exchanger outside the vehicle, the first expansion means, and the heat absorbing device. A first refrigerant line that communicates with the vehicle interior heat exchanger in this order and is used during a cooling operation; the compressor, the heat radiation vehicle interior heat exchanger, the second expansion unit, and the auxiliary heat exchanger; The gist is to include a second refrigerant line that is communicated in this order and is used during the heating operation, and a switching unit that selectively switches between the first refrigerant line and the second refrigerant line.

According to a third aspect of the present invention, there is provided an air conditioner for a vehicle according to the first aspect, wherein the compressor, the heat exchanger outside the vehicle, the first expansion means, and the heat absorbing device are provided. A third refrigerant line that communicates with the vehicle interior heat exchanger in this order and is used during cooling operation, the compressor, the heat radiation vehicle interior heat exchanger, the second expansion unit, the auxiliary heat exchanger, The first expansion means communicates with the heat absorbing vehicle interior heat exchanger in this order, a fourth refrigerant line used during the heating operation, a refrigerant inlet of the first expansion means and the heat absorbing vehicle interior heat. A first bypass pipe connected to bypass the first expansion means and the heat absorbing interior heat exchanger across the refrigerant outlet of the exchanger, and a second bypass pipe for opening and closing the first bypass pipe. 1 opening and closing means and the auxiliary heat exchange A second bypass pipe connected to bypass the auxiliary heat exchanger across the refrigerant inlet and the refrigerant outlet, a second opening / closing means for opening and closing the second bypass pipe, 3 refrigerant line and the fourth refrigerant line.
And a switching means for selectively switching between the refrigerant lines.

According to a fourth aspect of the present invention, there is provided an air conditioner for a vehicle according to the first aspect, wherein the compressor, the heat exchanger outside the vehicle, the first expansion means, and the heat absorbing device are provided. The vehicle interior heat exchanger is communicated in this order, and a third refrigerant line used during cooling operation, the compressor, the heat radiation interior heat exchanger, the second expansion means, and the auxiliary heat exchanger The first expansion means and the heat absorbing vehicle interior heat exchanger are communicated in this order, a fourth refrigerant line used during a heating operation, a refrigerant inlet of the first expansion means, and the heat absorbing vehicle. A first bypass pipe extending across the refrigerant outlet portion of the indoor heat exchanger so as to bypass the first expansion means and the heat absorbing interior heat exchanger; and opening and closing the first bypass pipe. First opening / closing means for performing A third bypass pipe connected to a refrigerant inlet and a refrigerant outlet of the tensioning means so as to bypass the second expansion means, and a third opening / closing means for opening and closing the third bypass pipe; The gist of the present invention is to include switching means for selectively switching between the third refrigerant line and the fourth refrigerant line.

According to a fifth aspect of the present invention, there is provided an air conditioner for a vehicle according to any one of the first to fourth aspects, wherein the heat generating means is provided from an upstream side in a vehicle interior air flow path. And the auxiliary heat exchanger and the heat-dissipating vehicle interior heat exchanger are arranged in this order.

According to a sixth aspect of the present invention, there is provided an air conditioner for a vehicle according to any one of the first to fifth aspects, wherein the heat generating means, the auxiliary heat exchanger, and the heat radiating device are provided. The gist is that the vehicle interior heat exchanger is formed integrally.

[0012]

According to the first aspect of the present invention, the dehumidifying and heating operation can be started quickly and quickly even when the vehicle prime mover cooling water is not warmed immediately after the engine is started, and even after the heating operation is started. In addition, there is an effect that a stable dehumidifying and heating operation can be performed regardless of introduction of outside air and circulation of inside air.

That is, immediately after the engine is started after being left in the low-temperature outside air for a long time, the state in which the temperature of the cooling water of the vehicle motor is not high enough to heat the air to be blown continues for a while. It was not possible to start the heating operation because it did not generate hot air and caused discomfort to the occupants.

However, even if the temperature of the vehicle motor cooling water is too low to warm the blast air, the vehicle motor cooling water rises more quickly than the refrigerant. It is possible to increase the compressor discharge pressure. Therefore, the present invention provides a heat-dissipating cabin heat exchanger and an auxiliary heat exchanger at positions where the heat of the heat-generating means can be received, and heats the refrigerant with the heat released by the heat-generating means, thereby reducing the compressor discharge pressure. Is quickly raised to increase the amount of refrigerant radiated in the heat radiating heat exchanger, thereby making it possible to heat the blown air by the heat released from the heat radiating vehicle interior heat exchanger.

As a result, the heating operation can be started immediately after the engine is started, and extremely excellent rapid dehumidifying and heating performance can be exhibited.

Further, even during warm-up immediately after the engine is started,
By driving the compressor, the engine load is increased, the calorific value of the engine is increased, and the temperature of the cooling water of the vehicle prime mover is promoted, so that the heating operation is started more quickly.

Here, when low-temperature outside air is introduced into the vehicle interior air passage, the heat-absorbing vehicle interior heat exchanger is excessively cooled by the blown air, so that the refrigerant is deprived of heat by the heat-absorbing vehicle interior heat exchanger. Condensed and accumulated, resulting in excessive pressure drop. Then, the refrigerant circulating in the refrigerant pipe decreases,
The heat released from the heat-exchange vehicle interior heat exchanger decreases, leading to a sharp decrease in heating performance. However, the present invention
Since the vehicle motor cooling water warms the refrigerant, it is possible to prevent excessive pressure drop in the heat absorbing vehicle interior heat exchanger and maintain a high compressor discharge pressure, thus ensuring stable heating performance. Can be. Since low-temperature outside air contains a small amount of water vapor in the air, dehumidification of the vehicle interior can be performed by introducing low-temperature outside air.

On the other hand, when the inside air is circulated, the heat exchanger does not excessively cool the heat-absorbing vehicle interior heat exchanger, so that the refrigerant removes heat from the blown air by the heat-absorbing vehicle interior heat exchanger. The air is dehumidified. In addition, since the compressor discharge pressure rises quickly by the vehicle motor cooling water warming the refrigerant, the heat radiation amount of the heat radiating vehicle interior heat exchanger is stabilized in a high state, and sufficient heating performance can be secured. Furthermore, by changing the amount of heat transferred by the auxiliary heat exchanger according to the state of the refrigerant, the compressor discharge pressure can be stabilized, and the heating performance can be kept constant. Becomes unnecessary.

Further, since both of the outside air and the inside air have sufficient dehumidifying performance and heating performance, the occupant can freely select the outside air introduction and the inside air circulation.

According to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, the cooling operation is selectively performed by switching the first refrigerant line and the second refrigerant line by the switching means. It is possible to use the refrigerant line properly at the time and during the heating operation, and the cooling operation and the heating operation can be efficiently performed.

That is, the first refrigerant line is used during the cooling operation, the second refrigerant line is used during the heating operation, and the auxiliary heat exchanger is used as an evaporator during the heating operation, so that dehumidification is achieved. Heating operation can be performed while performing.

According to the third aspect of the present invention, in addition to the effect of the first aspect of the present invention, the cooling operation is selectively performed by switching the third refrigerant line and the fourth refrigerant line by the switching means. The cooling line and the heating operation can be used properly, and the cooling operation and the heating operation can be performed efficiently, respectively.
By performing the opening / closing control of the opening / closing means and the second opening / closing means, it is possible to control the amount of heat radiation and the amount of heat absorbed by the refrigerant, thereby providing an effect of performing a stable heating operation.

That is, the third refrigerant line is used during the cooling operation, the fourth refrigerant line is used during the heating operation, and the first opening / closing means is connected to the first opening / closing means according to the state of the refrigerant during the heating operation. Opening / closing control with the second opening / closing means is performed.

For example, when the heating operation is started immediately after the engine is started after being left in the low temperature outside air for a long time, the second opening / closing means is closed, and the auxiliary heat exchanger is used as an evaporator. The first opening / closing means is opened to bypass the first expansion means and the heat absorbing interior heat exchanger via the first bypass pipe. As a result, the auxiliary heat exchanger receives the heat from the heat-radiating vehicle interior heat exchanger and the heat-generating means, thereby increasing the compressor discharge pressure, and increasing the amount of the refrigerant radiated by the heat-radiating vehicle interior heat exchanger. Then, the heat exchange rate with the introduced blast air is increased, and rapid heating is performed.

After the heating operation is started and the compressor discharge pressure reaches a specified value, the first opening / closing means is closed,
Using the heat absorbing vehicle interior heat exchanger as an evaporator, opening the second opening / closing means, via the second bypass pipe,
Bypass auxiliary heat exchanger. As a result, the refrigerant does not need to receive more heat than necessary from the heat generating means, so that the compressor discharge pressure is stabilized even when the temperature of the heat generating means is high or when the heating operation is performed for a long time.

According to the fourth aspect of the present invention, in addition to the effect of the first aspect of the present invention, the cooling means selectively switches between the third refrigerant line and the fourth refrigerant line by the switching means. The cooling line and the heating operation can be used properly, and the cooling operation and the heating operation can be performed efficiently, respectively.
By controlling the opening / closing of the third opening / closing means and the third opening / closing means, it is possible to obtain an effect that both the dehumidifying performance and the heating performance can be obtained. That is, the third refrigerant line is used during the cooling operation, When operating, use the fourth refrigerant line,
Further, at the time of the heating operation, opening / closing control of the first opening / closing means and the third opening / closing means is performed according to the state of the refrigerant.

For example, when the heating operation is started immediately after the engine is started after being left in the low temperature outside air for a long time, the third opening / closing means is closed, the second expansion means is operated, and the auxiliary heat Using the exchanger as an evaporator, opening the first opening / closing means and passing through the first bypass pipe to the first
Bypasses the expansion means and the heat absorbing vehicle interior heat exchanger.
As a result, the auxiliary heat exchanger receives the heat from the heat-radiating vehicle interior heat exchanger and the heat-generating means, thereby increasing the compressor discharge pressure, and increasing the amount of the refrigerant radiated by the heat-radiating vehicle interior heat exchanger. Then, the heat exchange rate with the introduced blast air is increased, and rapid heating is performed.

After the heating operation is started and the compressor discharge pressure reaches a specified value, the first opening / closing means is closed,
Using the heat absorbing vehicle interior heat exchanger as an evaporator, opening the third opening / closing means, via a third bypass pipe,
The second expansion means is bypassed and the auxiliary heat exchanger is used as a condenser. As a result, the auxiliary heat exchanger and the heat-radiating vehicle interior heat exchanger function as a condenser, and the amount of heat released from the refrigerant increases.
The compressor discharge pressure is stable even when the heating operation is performed for a long time.

According to the fifth aspect of the present invention, it is possible to easily transfer heat from the heat generating means to the auxiliary heat exchanger and the heat radiating vehicle interior heat exchanger, thereby exhibiting good rapid dehumidifying and heating performance. It has the effect that it can be done.

According to the sixth aspect of the present invention, the heat generating means, the auxiliary heat exchanger, and the heat exchanger for radiating the vehicle interior are integrated to further facilitate the transfer of heat, so that better rapidity is achieved. This has the effect that the dehumidifying and heating performance can be exhibited.

[0031]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a system configuration diagram showing a configuration of a first embodiment of a vehicle air conditioner according to the present invention.

The vehicle air conditioner 1 according to the first embodiment includes:
It consists of a heat pump type refrigeration cycle and a hot water line for circulating engine cooling water, and is arranged separately in the vehicle interior and outside the vehicle interior.

This refrigeration cycle includes a first refrigerant line L
1 and a second refrigerant line L2. The first refrigerant line L1 includes a compressor 2, a main condenser 3, which is a heat exchanger outside the vehicle, and a check valve 1 for preventing a backflow of the refrigerant.
5, a liquid tank 4, an expansion valve 5a as a first expansion means, and a main evaporator 6 as a heat exchanger for absorbing heat inside the vehicle, in this order, and a second refrigerant line L2
Are a compressor 2, a sub-condenser 7 which is a heat exchanger for radiating a vehicle interior, and an expansion valve 5b which is a second expansion means.
And a sub-evaporator 8 as an auxiliary heat exchanger are communicated in this order. In addition, the first compressor
As a switching means of the refrigerant lines L1 and L2 downstream of the branch point 12 between the refrigerant line L1 and the second refrigerant line L2,
Electromagnetic valves 14 and 16 for opening and closing the respective refrigerant lines are provided.

The hot water line includes an engine 10, a water valve 22 for adjusting a flow rate of cooling water of the engine 10,
The heater core 21 which is a heat generating means is communicated in this order.

In the first embodiment, the heater core 21, the sub-evaporator 8, and the sub-condenser 7 have an integral structure, and the main evaporator 6, and the expansion valve 5a have an integral structure. The sub-evaporator 8 and the sub-condenser 7 are disposed on the upstream side of the vehicle interior air flow path P1. The vehicle interior air flow path P1 is provided with a blower fan 31 and an intake door 32.
, Air mix door 33 and air mix chamber 3
4, a defroster door 35, a vent door 36, and a foot door 37.

During the cooling operation, the solenoid valve 14, which is the switching means for the refrigerant lines L1 and L2, is opened and the electromagnetic valve 16 is closed to select the refrigerant line L1. Accordingly, the high-temperature and high-pressure refrigerant compressed by the compressor 2 radiates heat in the main condenser 3 and is sent to the liquid tank 4 via the check valve 15. In the liquid tank 4, the liquid-phase refrigerant condensed by heat radiation is separated. The refrigerant that has exited the liquid tank 4 expands at the expansion valve 5 a and takes heat from the main evaporator 6. The refrigerant leaving the main evaporator 6 is sent to the compressor 2 and is recirculated.

In the vehicle interior air flow path P1, outside air and inside air are selected by the intake door 32, and the amount of air blown into the blower fan 31 is adjusted. The introduced blast air is cooled by being deprived of heat by the main evaporator 6, and the steam contained in the blast air is condensed and dehumidified. The dehumidified blown air is sent to the air mix chamber 34 by the air mix door 33 and sent out from each outlet.

During the heating operation, the solenoid valve 14 which is a switching means for the refrigerant lines L1 and L2 is closed and the solenoid valve 16
And select the refrigerant line L2. Thereby, the high-temperature and high-pressure refrigerant compressed by the compressor 2 radiates heat in the sub-condenser 7, expands in the expansion valve 5 b, and takes heat in the sub-evaporator 8. At this time, the sub-evaporator 8
Heat from the heater core 21 and the sub-condenser 7 having an integral structure is received. The amount of heat generated by the heater core 21 is controlled by the water valve 22 adjusting the flow rate of the cooling water. The refrigerant exiting the sub-evaporator 8 is sent to the compressor 2 and is recirculated.

The blast air introduced into the vehicle interior air passage P1 passes through the main evaporator 6, and is sent by the air mixing door 33 to the integral heater core 21, the sub-evaporator 8, and the sub-condenser 7. Heated by the heater core 21, dehumidified by the sub-evaporator 8,
It is further heated by the sub-condenser 7. Then, the air blown out of the sub condenser 7 is supplied to the air mixing chamber 34.
Is sent out from each outlet. Further, during the heating operation, since the refrigerant is not circulating in the main evaporator 6, the blown air is not deprived of heat by the main evaporator 6.

Since the heater core 21, the sub-evaporator 8 and the sub-condenser 7 are integrally formed, the heat of the heater core 21 can be easily received by the sub-evaporator 8 and the sub-condenser 7. In the middle of the machine, the refrigerant temperature can be increased to increase the discharge pressure of the compressor 2, the amount of refrigerant radiated by the sub-condenser 7 can be increased, and the dehumidifying and heating operation can be started immediately.

FIG. 2 is a system configuration diagram showing the configuration of a second embodiment of the vehicle air conditioner according to the present invention.

The second embodiment comprises a heat pump type refrigeration cycle and a hot water line for circulating engine cooling water, and is provided separately in the vehicle interior and outside the vehicle interior.
The air flow path P1 and the blower fan and the air mixing door, which control the flow rate and the outlet of the blown air, are not shown in FIG. This is the same as in the first embodiment.

This refrigeration cycle includes a third refrigerant line L
3 and a fourth refrigerant line L4. The third refrigerant line L3 includes a compressor 2, a main condenser 3 which is a heat exchanger outside the vehicle, and a check valve 1 for preventing a backflow of the refrigerant.
5, a liquid tank 4, an expansion valve 5a as a first expansion unit, and a main evaporator 6 as a heat exchanger for absorbing heat inside the vehicle, in this order, and a fourth refrigerant line L4
Are a compressor 2, a sub-condenser 7 which is a heat exchanger for radiating a vehicle interior, and an expansion valve 5b which is a second expansion means.
The sub-evaporator 8, which is an auxiliary heat exchanger, the liquid tank 4, the expansion valve 5a, which is a first expansion means, and the main evaporator 6, which is a heat absorbing vehicle interior heat exchanger, are communicated in this order. . Electromagnetic valves 14 and 16 for opening and closing the respective refrigerant lines are provided as switching means for the refrigerant lines L3 and L4 downstream of the branch point 12 between the refrigerant line L3 and the refrigerant line L4 from the outlet of the compressor 2. . Further, the expansion valve 5a extends across the refrigerant inlet of the expansion valve 5a and the refrigerant outlet of the main evaporator 6.
And a first bypass pipe 17a communicating with the main evaporator 6 so as to bypass the main evaporator 6, and a solenoid valve 9 as first opening / closing means for opening / closing the first bypass pipe 17a.
a, a second bypass pipe 17b communicating between the refrigerant inlet and the refrigerant outlet of the sub-evaporator 8 so as to bypass the sub-evaporator 8, and a second bypass pipe 17b for opening and closing the second bypass pipe 17b. And an electromagnetic valve 9b as an opening / closing means.

The hot water line is the same as in the first embodiment.

Although not shown, in the second embodiment, the main evaporator 6 and the
The expansion valve 5a is disposed on the upstream side of the vehicle interior air flow path P1 with respect to the heater core 21, the sub-evaporator 8, and the sub-condenser 7, which are integrated.

During the cooling operation, the solenoid valve 14 which is a switching means for the refrigerant lines L3 and L4 is opened, the solenoid valve 16 is closed, the refrigerant line L3 is selected, and the solenoid valve 9a which is an opening and closing means for the bypass pipe 17a is opened. Close. Thus, the high-temperature and high-pressure refrigerant compressed by the compressor 2 radiates heat in the main condenser 3 and is sent to the liquid tank 4 via the check valve 15. In the liquid tank 4, the liquid-phase refrigerant condensed by heat radiation is separated. The refrigerant that has exited the liquid tank 4 expands at the expansion valve 5 a and takes heat from the main evaporator 6. The refrigerant leaving the main evaporator 6 is sent to the compressor 2 and is recirculated.

The introduced blast air is deprived of heat by the main evaporator 6 and cooled, and water vapor contained in the blast air is condensed and dehumidified.

At the time of heating operation, particularly at the time of rapid heating operation such as immediately after the start of the engine, the solenoid valve 14 which is a switching means of the refrigerant lines L3 and L4 is closed, and the solenoid valve 16 is opened to select the refrigerant line L4. Bypass piping 17
The electromagnetic valve 9a, which is the opening / closing means for the bypass pipe 17b, is opened while the electromagnetic valve 9a, which is the opening / closing means for a, is opened. Thereby, the high-temperature and high-pressure refrigerant compressed by the compressor 2 radiates heat by the sub-condenser 7 and expands by the expansion valve 5b.
The sub-evaporator 8 removes heat. The refrigerant that has exited the sub-evaporator 8 bypasses the expansion valve 5a and the main evaporator 6 by passing through the bypass pipe 17a.
It is sent to the compressor 2 and recirculated. In this rapid heating operation, the heat of the sub-condenser 7 and the heater core 21 is received by the sub-evaporator 8, and the increase in the discharge pressure of the compressor 2 is promoted. The rate of heat exchange with the blast air is increased, and rapid heating is performed.

That is, the blast air introduced into the vehicle interior air flow path P1 passes through the main evaporator 6, and is sent to the heater core 21, the sub-evaporator 8, and the sub-condenser 7, which are of an integral structure. After being dehumidified, it is heated by the sub-condenser 7 as described above. In this rapid heating operation, since the refrigerant does not circulate through the main evaporator 6, the blown air is not deprived of heat by the main evaporator 6.

Here, after the heating operation is started and the discharge pressure of the compressor 2 reaches a specified value, the bypass pipe 1
The electromagnetic valve 9a, which is an opening / closing means for the bypass pipe 17b, is closed while the electromagnetic valve 9a, which is an opening / closing means for the bypass pipe 17b, is closed. As a result, the high-temperature and high-pressure refrigerant compressed by the compressor 2 is radiated by the sub-condenser 7 and then released by the bypass pipe 17.
By passing through b, the sub-evaporator 8 is bypassed, the expansion is performed by the expansion valve 5b and the expansion valve 5a, and heat is taken by the main evaporator 6. The refrigerant leaving the main evaporator 6 is sent to the compressor 2 and is recirculated. By bypassing the sub-evaporator 8, heat is not transferred more than necessary between the refrigerant and the heater core 21, so that the temperature of the heater core 21 becomes high or the heating operation takes a long time. Even in this case, the discharge pressure of the compressor 2 is stabilized.

FIG. 3 is a system configuration diagram showing the configuration of a third embodiment of the vehicle air conditioner according to the present invention.

The difference between the third embodiment and the second embodiment is that
Instead of the bypass pipe 17b that bypasses the sub-evaporator 8 and the solenoid valve 9b that opens and closes the bypass pipe 17b in the second embodiment, the expansion valve 5b extends across the refrigerant inlet and the refrigerant outlet of the expansion valve 5b. The third embodiment is provided with a third bypass pipe 17b that communicates with the third bypass pipe 17b, and an electromagnetic valve 9c that is a third opening / closing unit that opens and closes the third bypass pipe 17b.

During the cooling operation, similar to the second embodiment,
The solenoid valve 14 which is a switching means of the refrigerant lines L3 and L4 is opened, the electromagnetic valve 16 is closed, the refrigerant line L3 is selected, and the electromagnetic valve 9a which is an opening / closing means of the bypass pipe 17a is closed. The blown air is deprived of heat by the main evaporator 6 and cooled, and the steam contained in the blown air is condensed and dehumidified.

At the time of heating operation, particularly at the time of rapid heating operation such as immediately after the start of the engine, the electromagnetic valve 14 which is a switching means of the refrigerant lines L3 and L4 is closed, and the electromagnetic valve 16 is opened to select the refrigerant line L4. Bypass piping 17
The electromagnetic valve 9a, which is the opening / closing means for the bypass pipe 17c, is opened while the electromagnetic valve 9c, which is the opening / closing means for a, is opened. Thereby, the refrigerant compressed to a high temperature and a high pressure by the compressor 2 radiates heat by the sub-condenser 7 and expands by the expansion valve 5b.
The sub-evaporator 8 removes heat. The refrigerant that has exited the sub-evaporator 8 bypasses the expansion valve 5a and the main evaporator 6 by passing through the bypass pipe 17a.
It is sent to the compressor 2 and recirculated. In this rapid heating operation, the heat of the sub-condenser 7 and the heater core 21 is received by the sub-evaporator 8, and the increase in the discharge pressure of the compressor 2 is promoted. The rate of heat exchange with the blast air is increased, and rapid heating is performed.

That is, the blast air introduced into the vehicle interior air flow path P 1 passes through the main evaporator 6, and is sent to the heater core 21, the sub-evaporator 8, and the sub-condenser 7, which are integrated, and the sub-evaporator 8 After being dehumidified, it is heated by the sub-condenser 7 as described above. In this rapid heating operation, since the refrigerant does not circulate through the main evaporator 6, the blown air is not deprived of heat by the main evaporator 6.

Here, after the heating operation is started and the discharge pressure of the compressor 2 reaches a specified value, the bypass pipe 1
The electromagnetic valve 9a, which is an opening / closing means for the bypass pipe 17c, is opened while the electromagnetic valve 9a, which is an opening / closing means for the bypass pipe 7c, is closed. As a result, the refrigerant compressed to a high temperature and a high pressure by the compressor 2 passes through the bypass pipe 17c, and is expanded by the expansion valve 5b.
And heat is released by the sub-condenser 7 and the sub-evaporator 8. The refrigerant that has left the sub-evaporator 8 is
The heat is expanded by the expansion valve 5 a and the heat is taken by the main evaporator 6. The refrigerant leaving the main evaporator 6 is sent to the compressor 2 and is recirculated. By bypassing the expansion valve 5b in this way, the sub-evaporator 8 functions as a condenser, so that the heat radiation amount of the refrigerant increases and the flow rate of the cooling water flowing through the heater core 21 can be reduced. Therefore, the heat is not transferred more than necessary between the refrigerant and the heater core 21, so that the discharge pressure of the compressor 2 is further stabilized even when the heating operation is performed for a long time.

The embodiments described above are described to facilitate understanding of the present invention, and do not limit the present invention. Therefore, each element shown in the above-described embodiment is intended to include all design choices belonging to the technical scope of the present invention.

For example, when applied to an electric vehicle,
The present invention is not limited to the above embodiment as long as it is designed so that heat can be transferred quickly, for example, by using a cooling water line of an electric motor and an electric heater as heat generating means.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a system configuration diagram showing a second embodiment of the present invention.

FIG. 3 is a system configuration diagram showing a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vehicle air conditioner 2 Compressor 3 Main condenser 4 Liquid tank 5a, 5b Expansion valve 6 Main evaporator 7 Subcondenser 8 Subevaporator 9a, 9b, 9c Solenoid valve 10 Engine 21 Heater core P1 Interior air flow path L1 First refrigerant line L2 Second refrigerant line L3 Third refrigerant line L4 Fourth refrigerant line

Claims (6)

[Claims] An air conditioner for a vehicle for adjusting a temperature environment in a vehicle interior, wherein a compressor (2) for compressing a refrigerant, and heat exchange outside the vehicle compartment for releasing heat of the refrigerant introduced from the compressor (2) to outside air. A heat exchanger (7) disposed in the vehicle interior air flow path (P1) for releasing the heat of the refrigerant introduced from the compressor (2) to the blast air; An auxiliary heat exchanger (8) disposed in the vehicle interior air flow path (P1) and transferring heat to and from a refrigerant introduced from the heat radiation vehicle interior heat exchanger (7) and flowing therein; A heat absorbing interior heat exchanger (6) disposed in the air flow path (P1) for absorbing the heat of the blown air into the refrigerant introduced from the exterior heat exchanger (3); The refrigerant introduced from the heat exchanger (3) to the heat absorbing vehicle interior heat exchanger (6) First expansion means (5a) for expanding, and second expansion means (5b) for expanding a refrigerant introduced from the heat-radiating vehicle interior heat exchanger (7) to the auxiliary heat exchanger (8). Heating means (2) provided in the vehicle interior air flow path (P1)
1), wherein the heat absorbing vehicle interior heat exchanger (6) is more than the heat releasing vehicle interior heat exchanger (7), the auxiliary heat exchanger (8), and the heat generating means (21). The heat exchanger (7) for radiating heat and the auxiliary heat exchanger (8) are provided upstream of the air passage (P1) in the vehicle compartment, and can receive heat from the heat generating means (21). An air conditioner for a vehicle, wherein the air conditioner is disposed at a suitable position. 2. The compressor (2), the vehicle exterior heat exchanger (3), the first expansion means (5a), and the heat absorbing vehicle interior heat exchanger (6) are arranged in this order. A first refrigerant line (L1) that is communicated and used during a cooling operation
The compressor (2), the heat-radiating vehicle interior heat exchanger (7), the second expansion means (5b), and the auxiliary heat exchanger (8) are communicated in this order, and Switching means (14) for selectively switching between a second refrigerant line (L2) used during operation, the first refrigerant line (L1), and the second refrigerant line (L2);
The vehicle air conditioner according to claim 1, further comprising (16). 3. The compressor (2), the exterior heat exchanger (3), the first expansion means (5a), and the heat absorbing interior heat exchanger (6) are arranged in this order. Third refrigerant line (L3) that is communicated and used during cooling operation
The compressor (2), the heat-dissipating interior heat exchanger (7), the second expansion means (5b), the auxiliary heat exchanger (8), and the first expansion means ( 5a) and the heat absorbing vehicle interior heat exchanger (6) are communicated in this order;
A fourth refrigerant line (L4) used during the heating operation, a refrigerant inlet of the first expansion means (5a), and a refrigerant outlet of the heat-absorbing vehicle interior heat exchanger (6). A first bypass pipe (17a) communicating with the first expansion means (5a) and the heat-absorbing interior heat exchanger (6), and a first bypass pipe (17a). A first opening / closing means (9a) that opens and closes, and a second opening / closing unit that communicates with the auxiliary heat exchanger (8) so as to bypass the auxiliary heat exchanger (8) across the refrigerant inlet and the refrigerant outlet. A second bypass pipe (17b); a second opening / closing means (9b) for opening and closing the second bypass pipe (17b); a third refrigerant line (L3); and a fourth refrigerant line (L4). Switching means (14) for selectively switching between
(16) The vehicle air conditioner according to claim 1, comprising: 4. The compressor (2), the exterior heat exchanger (3), the first expansion means (5a), and the heat absorbing interior heat exchanger (6) are arranged in this order. Third refrigerant line (L3) that is communicated and used during cooling operation
The compressor (2), the heat-dissipating interior heat exchanger (7), the second expansion means (5b), the auxiliary heat exchanger (8), and the first expansion means ( 5a) and the heat absorbing vehicle interior heat exchanger (6) are communicated in this order;
A fourth refrigerant line (L4) used during the heating operation, a refrigerant inlet of the first expansion means (5a), and a refrigerant outlet of the heat-absorbing vehicle interior heat exchanger (6). A first bypass pipe (17a) communicating with the first expansion means (5a) and the heat-absorbing interior heat exchanger (6), and a first bypass pipe (17a). A first opening / closing means (9a) for opening and closing, a refrigerant inlet part of the second expansion means (5b), and a refrigerant outlet part are connected to bypass the second expansion means (5b). The third bypass pipe (17c), a third opening / closing means (9c) for opening and closing the third bypass pipe (17c), the third refrigerant line (L3), and the fourth refrigerant. Switching means (14) for selectively switching the line (L4);
The vehicle air conditioner according to claim 1, further comprising: (16). 5. The heating means (21) and the auxiliary heat exchanger (8) from an upstream side in a vehicle interior air flow path (P1).
The air conditioner for a vehicle according to any one of claims 1 to 4, wherein the heat exchanger (7) for radiating heat is arranged in this order. 6. The heat generating means (21), the auxiliary heat exchanger (8), and the heat radiating vehicle interior heat exchanger (7) are integrally formed. The vehicle air conditioner according to any one of claims 1 to 5.