JPH0939554A - Heat pump heating, cooling and dehumidifying device for electric automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the subject device, simple in cycle structure, improved in safety in traveling and amenity in the room of a car, and to secure stable capability and reliability of a compressor. SOLUTION: In a heating cycle to be subjected to high temperature together with a first car inside heat exchanger 10 and a second car inside heat exchanger 11, a refrigerant bypass circuit 13 for preventing refrigerant from being allowed to flow to the front car inside heat exchanger 10 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump cooling and heating dehumidifying device for an electric vehicle that air-conditions the interior of the electric vehicle.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram of a conventional heat pump cooling / heating / dehumidifying device for an electric vehicle during a heating operation.

The structure of the conventional heat pump cooling and heating dehumidifying device for an electric vehicle is the same for both the cooling operation and the heating operation and will be described with reference to FIG. In FIG. 3, a compressor 1, a vehicle exterior air heat exchanger 2, a vehicle exterior air heat exchanger blower 3,
An air blower 6 for the vehicle interior air heat exchanger, and a ventilation circuit 9 connecting the air blower 6 for the vehicle interior air heat exchanger and the vehicle interior outlet 8.
A first vehicle interior air heat exchanger 10 arranged in the ventilation circuit 9 and a second vehicle interior air heat exchanger 10 arranged in the ventilation circuit 9 downstream of the first vehicle interior air heat exchanger 10. The air introduction amount of the vehicle interior air heat exchanger 11 and the second vehicle interior air heat exchanger 11 arranged downstream of the first vehicle interior air heat exchanger 10 in the ventilation circuit 9 is adjusted. The damper 12, the four-way switching valve 7, the refrigerant expansion device 4, the compressor 1, the vehicle exterior air heat exchanger 2, the first and second vehicle interior air heat exchangers 10 and 11, and the four-way switching. The heat pump cooling and heating dehumidification device comprised with the refrigerant piping 5 which connects the valve 7 is shown.

In the apparatus constructed as described above, the flow of the refrigerant during the heating operation is shown by an arrow in FIG. The damper 12 is set to the position indicated by the solid line so that heat is exchanged by the second vehicle interior air heat exchanger 11, and the four-way switching valve 7 is set to the position indicated by the solid line. Therefore, the high-temperature and high-pressure refrigerant discharged from the compressor 1 is guided to the first vehicle interior air heat exchanger 10 via the four-way switching valve 7. Then, the refrigerant is condensed and liquefied while radiating heat by exchanging heat with the air blown by the air blower 6 for the vehicle interior air heat exchanger, and then guided to the second vehicle interior air heat exchanger 11 for further heat radiation. To do. Then, the pressure is reduced by the refrigerant expansion device 4, the heat is absorbed by the outside air heat exchanger 2 to evaporate the refrigerant, and the heat pump heating for returning to the compressor 1 via the four-way switching valve 7 is performed.

FIG. 4 is a block diagram of a conventional heat pump cooling / heating / dehumidifying device for an electric vehicle in a cooling operation of the embodiment.

FIG. 4 shows the flow of the refrigerant during the cooling operation with arrows. Further, the damper 12 is set to the position of the solid line so that heat is not exchanged in the second vehicle interior air heat exchanger 11,
The four-way switching valve 7 is set to the position indicated by the solid line. Therefore, the high-temperature and high-pressure refrigerant discharged from the compressor 1 passes through the four-way switching valve 7 and is radiated by the outside air heat exchanger 2 to condense and liquefy the refrigerant. Then, the pressure is reduced by the refrigerant expansion device 4, and is guided to the first vehicle interior air heat exchanger 10 via the second vehicle interior air heat exchanger 11. By exchanging heat with the air blown by the air blower 6 for the vehicle interior air heat exchanger, the refrigerant evaporates while cooling and dehumidifying and returns to the compressor 1 to perform a cooling operation.

That is, the first vehicle interior air heat exchanger 1
0 indicates a low temperature and a low pressure during the cooling operation and a high temperature and a high pressure during the heating operation.

[0008]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention In a heat pump cooling and heating dehumidifying device for an electric vehicle, for example, in the middle season (spring,
(Autumn) In the daytime, such as when the weather is good, the cooling operation may be performed, and at night, the heating operation may be performed. In this way, it becomes necessary to continuously switch between the cooling operation and the heating operation.

In other words, in such a use, the air passing through the first vehicle interior air heat exchanger 10 is cooled and dehumidified during the cooling operation, so that the first vehicle interior air heat exchanger 10 is operated. Dehumidifying water collects. Further, when the heating operation is further continued, in the above-mentioned configuration, the first vehicle interior air heat exchanger 10 has a high temperature, so the dehumidified water is also warmed up, and hot and humid air is blown out. If this happens, the humidity in the limited space inside the vehicle suddenly rises and the windows become cloudy, making it impossible to drive. In addition, the occupant feels hot and humid air, which causes discomfort.

The above has been a problem in using the heat pump dehumidifying and heating operation in an air conditioner for an electric vehicle.

The present invention solves the above problems, and an object of the present invention is to provide an air conditioner for an electric vehicle, which can improve the safety during traveling and the comfort inside the vehicle.

[0012]

In order to solve the above-mentioned problems, the present invention provides a first vehicle interior air heat exchanger for exchanging heat of a refrigerant with air blown into a vehicle interior, and the first vehicle interior heat exchanger. A second vehicle interior air heat exchanger arranged downstream of the vehicle interior air heat exchanger for further exchanging heat of the refrigerant with the air that has exchanged heat with the first vehicle interior air heat exchanger; Refrigerant bypass circuit for causing almost no refrigerant to flow into the first vehicle interior air heat exchanger in the heating cycle in which both the vehicle interior air heat exchanger and the second vehicle interior air heat exchanger have high temperatures Is provided.

[0013]

With this configuration, the first vehicle interior air heat exchanger does not reach a high temperature during the heating operation.

[0014]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a configuration diagram of a heat pump cooling and heating dehumidifying device for an electric vehicle according to an embodiment of the present invention during heating operation.

The configuration of the heat pump cooling and heating dehumidifying device for an electric vehicle in one embodiment of the present invention is the same for both the cooling operation and the heating operation and will be described with reference to FIG. In FIG. 1, a compressor 1, a vehicle exterior air heat exchanger 2, a vehicle exterior air heat exchanger blower 3, and a vehicle interior air heat exchanger blower 6
A ventilation circuit 9 that connects the ventilation device 6 for the vehicle interior air heat exchanger and the vehicle interior air outlet 8; a first vehicle interior air heat exchanger 10 arranged in the ventilation circuit 9; and the ventilation circuit 9 Of the second vehicle interior air heat exchanger 11 arranged downstream of the first vehicle interior air heat exchanger 10 and the first vehicle interior air heat exchanger 10 in the ventilation circuit 9. A damper 12 arranged on the downstream side for adjusting the amount of air introduced into the second vehicle interior air heat exchanger 11, a four-way switching valve 7, and a refrigerant expansion device 4
And a refrigerant pipe 5 connecting the compressor 1, the vehicle exterior air heat exchanger 2, the first and second vehicle interior air heat exchangers 10 and 11, the four-way switching valve 7, and the refrigerant expansion device 4. ,
A heat pump including a refrigerant bypass circuit 13 that bypasses the refrigerant flowing through the first vehicle interior air heat exchanger 10, and an on-off valve 14 that has almost no resistance in a refrigerant passage arranged in the refrigerant bypass circuit 13. The air conditioning dehumidifier is shown.

In the apparatus configured as described above, FIG. 1 shows the flow of the refrigerant during the heating operation by arrows. At this time, the dotted arrow indicates that the refrigerant hardly flows. In addition, the damper 12 is set to the position indicated by the solid line, and the second
The four-way switching valve 7 is set to the position indicated by the solid line, and the on-off valve 14 is set to the open state (the state where the refrigerant flows, the solid line). First, the flow and action of the refrigerant will be described. The high-temperature and high-pressure refrigerant discharged from the compressor 1 is the second vehicle interior air heat exchanger 11
The heat is exchanged to condense and liquefy, and the four-way switching valve 7 is entered. Then, it is switched so as to be directed to the first vehicle interior air heat exchanger 10, but the opening / closing valve 14 hardly flows into the first vehicle interior air heat exchanger 10 having a large passage resistance, and the passage resistance is small. It is guided to the refrigerant expansion device 4 via the on-off valve 14. Then, the pressure of the refrigerant is reduced, and the refrigerant is guided to the outside air heat exchanger 2 so that the refrigerant exchanges heat and evaporates, and returns to the compressor 1 via the four-way switching valve 7. Therefore, the first vehicle interior air heat exchanger 10 does not reach a high temperature state. In the air conditioning of the vehicle interior, the air blown by the air blower 6 for the vehicle interior air heat exchanger is not heat-exchanged by the first vehicle interior air heat exchanger 10, but the second vehicle interior air heat exchange is performed. It is possible to perform heat pump heating in which heat is exchanged and heated only in the vessel 11.

FIG. 2 is a block diagram of the heat pump cooling / heating / dehumidifying device for an electric vehicle in one embodiment of the present invention during cooling operation.

FIG. 2 shows by arrows the flow of the refrigerant during the cooling operation. Further, the damper 12 is set to a solid line position so that heat is not exchanged in the second vehicle interior air heat exchanger 11, the four-way switching valve 7 is set to a solid line position, and the opening / closing valve 14 is closed (refrigerant is Not flowing, dotted line). First, the flow and action of the refrigerant will be described. The high-temperature and high-pressure refrigerant discharged from the compressor 1 enters the four-way switching valve 7 via the second vehicle interior air heat exchanger 11 and enters the vehicle exterior air there. It is switched so as to lead to the heat exchanger 2. After the heat is exchanged by the outside air heat exchanger 2 to condense and liquefy the refrigerant, the pressure is reduced by the refrigerant expansion device 4. Then, the refrigerant is introduced into the first vehicle interior air heat exchanger 10 by the opening / closing valve 14, and the refrigerant exchanges heat to be evaporated and vaporized,
Returning to the compressor 1 via the four-way switching valve 7. Therefore, the first vehicle interior air heat exchanger 10 is in a low temperature and low pressure state. In the air conditioning of the vehicle compartment, the air blown by the air blower 6 for the vehicle interior air heat exchanger is heat-exchanged by the first vehicle interior air heat exchanger 10 to allow cooling and dehumidification. .

That is, when switching from the cooling operation to the heating operation, the four-way switching valve 7 and the opening / closing valve 14 are switched. By doing so, the refrigerant hardly flows into the first vehicle interior air heat exchanger 10 during the heating operation, so that the high temperature state is not achieved. Therefore, the dehumidified water adhering to the first vehicle interior air heat exchanger 10 is not warmed, hot and humid air is not blown out, and the window does not become cloudy and the vehicle cannot run. In addition, without blowing out hot and humid air toward the occupant,
No discomfort.

[0021]

As described above, according to the present invention, it is possible to prevent the refrigerant from flowing to the first vehicle interior air heat exchanger during the heating operation by simply providing the refrigerant bypass circuit and the opening / closing valve between the refrigerant bypass circuit and the refrigerant bypass circuit. You can prevent the situation.

Therefore, even when the cooling operation is switched to the heating operation, the dehumidified water adhering to the first vehicle interior air heat exchanger is not warmed up, so hot and humid air is not blown out and the window is opened. It does not become cloudy and impossible to drive. In addition, hot and humid air is not blown toward the occupant, and no discomfort is given. Therefore, the cycle configuration is simple, the passenger compartment can always be kept comfortable, and safety during traveling can be ensured.

Moreover, since the inlet and outlet of the first vehicle interior air heat exchanger are not completely shut off, it is possible to prevent refrigerant and oil from accumulating in the first vehicle interior air heat exchanger. . That is, unstable operation is not performed in the state where the refrigerant is insufficient. In addition, the operation that deteriorates the reliability of the compressor is not performed even when the oil is insufficient. Therefore, it is possible to secure a stable capacity and the reliability of the compressor.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a heat pump cooling and heating dehumidifying device for an electric vehicle according to an embodiment of the present invention during heating operation.

FIG. 2 is a configuration diagram of the heat pump cooling and heating dehumidifying device for an electric vehicle according to an embodiment of the present invention during cooling operation.

FIG. 3 is a block diagram of a conventional heat pump cooling and heating / dehumidifying device for an electric vehicle during heating operation in an embodiment.

FIG. 4 is a block diagram of a conventional heat pump cooling / heating dehumidifying device for an electric vehicle during cooling operation in an embodiment.

[Explanation of symbols]

 1 Compressor 2 Outside Air Heat Exchanger 3 Blower for Outside Air Heat Exchanger 4 Refrigerant Throttle Device 5 Refrigerant Piping 6 Blower for Inside Air Heat Exchanger 7 Four-way Switching Valve 8 Inside Air Outlet 9 Ventilation Circuit 10 1st Interior air heat exchanger 11 Second interior air heat exchanger 12 Damper 13 Refrigerant bypass circuit 14 Open / close valve

Claims (1)

[Claims] 1. A first vehicle interior air heat exchanger for exchanging heat of the refrigerant with air blown into the vehicle interior, and heat of the refrigerant disposed downstream of the first vehicle interior air heat exchanger. A second passenger compartment air heat exchanger for further exchanging heat with the air that has exchanged heat with the first passenger compartment air heat exchanger, the first passenger compartment air heat exchanger and the second passenger compartment air A heat pump cooling and heating dehumidifying device for an electric vehicle, characterized in that a refrigerant bypass circuit is provided in the first vehicle interior air heat exchanger to prevent a refrigerant from almost flowing in a heating cycle in which both the heat exchangers become high temperature. .