JPH10297261A - Heat exchanger for electric vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To integrate a plurality of reserve tanks and simplify the water pouring work and a configuration of a heat exchanger for electric vehicle. SOLUTION: A heat exchanger for electric vehicle is provided with a hot water circuit for heating 16 which heats the air before it is blown into a vehicle room 14 up to a predetermined temperature by hot water and a cooling circuit 22 which cools a battery 20 which supplies electric energy to a motor for running 18 and this motor for running 18 by cooling water. Water is supplied and discharged through single reserve tank 90 in the hot water circuit 16 and the cooling circuit 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating hot water circuit for heating air blown into a vehicle cabin to a predetermined temperature with hot water, a traveling motor, and a battery for supplying electric energy to the traveling motor. The present invention relates to a heat exchange device for an electric vehicle, comprising: a cooling circuit for cooling water with cooling water.

[0002]

2. Description of the Related Art Generally, in electric vehicles, a heat pump system using a high-temperature and high-pressure cooling medium discharged from a compressor in a refrigerating cycle is used as a heat exchange device for heating. In this method, hot water as a heating medium is circulated along a circulation path under the action of a water pump, and is also heated by a high-temperature and high-pressure cooling medium and supplied to a heater core to exchange heat with air passing through the heater core. Thereby, the air is heated to a desired temperature.

Further, in an electric vehicle, a cooling heat exchange device is used to cool a traveling motor and a battery for supplying electric power to the traveling motor. In this cooling heat exchange device, cooling water is circulated along a circulation path communicating with a traveling motor and a battery cooling circulation path provided in a battery storage box, and the high-temperature cooling water is transferred to a heat source such as a radiator. The temperature of the cooling water is reduced by exchanging heat with external air through an exchanger.

[0004]

By the way, in the above heat exchanger for heating, generally, in response to an increase in water pressure due to a rise in water temperature in the circulation path or a request for water injection, a branch is made from the circulation path. A reserve tank is provided, and a device is provided for draining and refilling the hot water between the circulation path and the reserve tank. On the other hand, in the cooling heat exchange device described above, a reserve tank communicating with the heat exchanger is provided for the same reason.

However, there are independent hot water circuits for the heat exchange device for heating and the heat exchange device for cooling, and the reserve tanks are individually arranged.
In the heating heat exchange device, the water temperature is set to 60 ° C. to 80 ° C. from the circulation path to the inside of the reserve tank for heating, while the cooling heat exchange device is set to 60 ° C. from the circulation path to the inside of the reserve tank for cooling. This is because the water temperature is set to not more than ℃.

Thus, in the electric vehicle, the water injection work is performed for each of the reserve tanks provided separately for the heat exchange device for heating and the heat exchange device for cooling, and the water injection operation is considerably complicated. Problems have been pointed out. In addition, since two reserve tanks are used, there is a problem that manufacturing costs and arrangement space increase.

The present invention solves this kind of problem and provides a heat exchange device for an electric vehicle that can integrate a plurality of reserve tanks and can simplify water injection work and configuration. The purpose is to do.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a heat exchange device for an electric vehicle according to the present invention is provided for heating air before being blown into a vehicle cabin to a predetermined temperature with hot water. The heating hot water circuit includes a reserve tank that forms a parallel hot water circuit with respect to a pipe forming a part of a first circulation path for circulating the hot water. Therefore, when the hot water circuit is driven and hot water heated to a predetermined temperature is circulated along the first circulation path, the hot water does not flow into the reserve tank, and the water temperature in the reserve tank is reduced to the first temperature. The temperature of the hot water circulated along one circulation path can be maintained lower than the temperature of the hot water.

Therefore, when water is replenished and drained between the second heat exchanger constituting the cooling circuit for cooling the traveling motor and the battery and the reserve tank of the hot water circuit, the second heat exchanger is used. No hot water is injected into the water. Accordingly, it is not necessary to provide separate reserve tanks for the heating hot water circuit and the cooling circuit, and it is possible to perform water replenishment and drainage to the heating hot water circuit and the cooling circuit via a single reserve tank. This simplifies the operation and configuration of water injection into the reserve tank.

Further, the reserve tank forms a parallel hot water circuit with a pipe forming a part of the first circulation path,
This reserve tank is disposed above the pipeline. Therefore, water does not flow into the reserve tank due to a head difference from the first pump provided in the first circulation path,
It is possible to reliably prevent the water temperature in the reserve tank from increasing.

[0011]

FIG. 1 is a partial schematic perspective view of an electric vehicle 12 incorporating a heat exchange device 10 according to an embodiment of the present invention.

The heat exchange device 10 supplies a heating hot water circuit 16 for heating air before being blown into the vehicle interior 14 to a predetermined temperature with hot water, a traveling motor 18, and electric energy to the motor 18. And a cooling circuit 22 for cooling the battery 20 to be cooled by cooling water.

As shown in FIG. 2, the hot water circuit 16 is incorporated in an automatic air conditioner 24. The automatic air conditioner 24 includes a duct main body 26 for blowing out temperature- and humidity-controlled air into the passenger compartment 14, and The refrigerant circuit 28 cools the air by exchanging heat between the air flowing through the duct main body 26 and the cooling medium, and heat exchanges between the air flowing through the duct main body 26 and the hot water. The apparatus includes the hot water circuit 16 for heating air, and an air mixing means 30 disposed in the duct main body 26 for performing air mix control of cold air and hot air.

The duct main body 26 is disposed on the front side in the vehicle interior 14 via an instrument panel (not shown), and the air in the vehicle interior 14 is provided upstream of the duct main body 26. An inside air introduction port 34 for introducing air and an outside air introduction port 36 for introducing air outside the vehicle compartment 14 are provided to be freely opened and closed via a switching damper 38.

The switching damper 3 is provided in the duct body 26.
The blower 40 is disposed adjacent to the side of the blower 40.
An evaporator 42 constituting the refrigerant circuit 28 is disposed downstream of the evaporator 42. Downstream of the evaporator 42, a heater core (first heat exchanger) 44 constituting the hot water circuit 16 is provided, and the air mixing means 30 is mounted on the inlet side of the heater core 44. Air mixing means 30
Has an air mix damper 46, and the air mix damper 46 has an opening of 0% through an air mix motor 48.
Is rotatable at an arbitrary angle within a range of 100% of the opening from this position.

Downstream of the duct body 26, a differential outlet 50 for blowing air toward the inner surface of the front windshield of the electric vehicle, a face outlet 52 for blowing air toward the head of the occupant, And a foot outlet 54 for blowing air toward the foot of the user. The differential outlet 50, the face outlet 52, and the foot outlet 54 have a differential damper 56, a face damper 58, and a foot damper 60, respectively.
Is rotatably mounted.

The evaporator 42 exchanges heat between the cooling medium flowing into the inside and the air sent from the blower 40 into the duct main body 26, thereby evaporating the cooling medium and cooling the air. It has a function to do. The refrigerant circuit 28 including the evaporator 42 includes:
An electric compressor 62 is provided.
An accumulator 66 is interposed in the low pressure side refrigerant pipe 64a connecting the suction port side of the evaporator 42 and the outlet port side of the evaporator 42. The electric compressor 62 compresses a cooling medium (gas refrigerant) sucked into the inside from the suction port and discharges it as a high-temperature, high-pressure cooling medium from the discharge port side to the refrigerant pipe 64b side. The accumulator 66 separates the cooling medium into a liquid refrigerant and a gas refrigerant, and
It has the function of supplying to

The refrigerant pipe 64b is branched at its distal end into refrigerant pipes 64c and 64d.
c branches into refrigerant pipes 64e and 64f. Refrigerant line 64
A first electromagnetic valve 68 is provided in c, a second electromagnetic valve 70 is provided in the refrigerant line 64f, and the refrigerant line 64f is connected to the refrigerant line 64a. Refrigerant line 64
e, an outdoor heat exchanger 72 is provided. The outdoor heat exchanger 72 exchanges heat between the low-temperature, low-pressure gas-liquid two-phase cooling medium and the outside air blown by the outdoor fan 74 during the heating operation. While the cooling medium is evaporated and vaporized, the cooling medium has a function of exchanging heat between a high-temperature and high-pressure gas refrigerant and outside air blown by the outdoor fan 74 during a cooling operation to condense and liquefy the gas refrigerant.

A first capillary tube 76 for heating is disposed in the refrigerant line 64d.
d and the refrigerant pipe 64e are integrated as a refrigerant pipe 64g and connected to the introduction side of the evaporator 42. A third solenoid valve 78 and a second capillary tube 80 for cooling are provided in parallel with the refrigerant pipe 64g.

The hot water circuit 16 includes a first water pump 84 for circulating hot water along the first circulation path 82 and a heat exchange for heating the hot water circulated along the first circulation path 82. (Heating means) 86 and duct body 26
A heater core 44 for heating the air by exchanging heat between the hot water and the air inside the first circulation path 8
2 and a reserve tank 90 arranged in parallel with the pipe 88 and disposed above the pipe 88. In addition,
The first circulation path 82 may be provided with a combustion heater (not shown) as necessary.

The heat exchanger 86 surrounds the refrigerant pipe 64b constituting the refrigerant circuit 28 over a predetermined length, and has an outer pipe portion 92 having a double pipe structure. This heat exchanger 86
When the high-temperature and high-pressure cooling medium discharged from the electric compressor 62 flows through the refrigerant pipe 64b, the outer pipe 9
2 has a function of heating the hot water by causing heat exchange between the hot water passing through 2 and the cooling medium.

The reserve tank 90 has a water inlet 9 at the upper end.
4 is provided, and the water inlet 94 is closed, and a cap 96 is attached. The hot water circuit 16 has one end communicating with the pipe 88, the other end communicating with the upper portion of the reserve tank 90, an inflow-side first bypass pipe 98, one end communicating with the pipe 88, and the other end communicating with the pipe 88. An inflow-side second bypass pipe 100 communicating with the vicinity of the lower portion of the reserve tank 90 is provided.

First and second bypass lines 98, 100
Pipe 8 forming a parallel circuit with reserve tank 90 between
8 has the same diameter as a whole and is formed of a flexible elastic body.

As shown in FIGS. 1 and 3, the cooling circuit 2
2 is a second water pump 104 for circulating cooling water along the second circulation path 102, a radiator (second heat exchanger) 106 for cooling the cooling water, and a radiator 10
6 that communicates the upper part of the reservoir 6 with the inside of the reserve tank 90
08.

The battery 20 is a battery storage box 1
10 and the battery storage box 1
A circulation passage (not shown) for cooling the battery 20 in communication with the second circulation passage 102 is provided in 10. The second circulation path 102 has a water path 114 branched near a radiator 106 via a three-port valve 112. The water pipe 108 has one end connected to the upper part of the radiator 106 and the other end penetrating through the cap 96 of the reserve tank 90 and is disposed near the bottom in the reserve tank 90.

The operation of the heat exchange apparatus 10 configured as described above will be described below.

First, in the automatic air conditioner 24, when the operation mode is the cooling operation, the heating operation, the dehumidifying operation, and the blowing operation, the routes of the respective refrigerant circuits 28 are as shown in Table 1.
Is shown in

[0028]

[Table 1]

Therefore, when the operation mode is the heating operation, as shown in Table 1 and FIG. 2, the first and third solenoid valves 68 and 78 are closed and the second solenoid valve 70 is opened. . Therefore, the cooling medium discharged from the electric compressor 62 is decompressed from the refrigerant pipes 64b and 64d through the first capillary tube 76, and is vaporized through the outdoor heat exchanger 72 in a gas-liquid two-phase state. Second solenoid valve 7
0, the accumulator 6 through the refrigerant pipes 64f and 64a.
6 to the electric compressor 62.

At that time, in the hot water circuit 16, the hot water is circulated along the first circulation path 82 under the driving action of the first water pump 84, and the outer pipe 9 constituting the heat exchanger 86 is circulated.
2 is supplied with the warm water. Accordingly, a high-temperature, high-pressure cooling medium flows through the refrigerant pipe 64b into the outer pipe 92, so that the hot water in the outer pipe 92 is heated. The hot water is introduced into the heater core 44 and heats the air passing through the heater core 44 to a predetermined temperature.

On the other hand, as shown in FIG.
The motor 18 is driven via electric energy supplied from a battery 20, and a cooling circuit 22 is driven to cool the battery 20 and the motor 18. That is, as shown in FIG. 1 and FIG.
Under the operation of the water pump 104, the second circulation path 10
Cooling water is circulated along the cooling water 2, and the cooling water, which has cooled the motor 18 and the battery 20 and has become high temperature, exchanges heat with external air by passing through the radiator 106.
The cooling water has a low temperature.

In the hot water circuit 16, the pipe 8 connected to the first and second bypass pipes 98 and 100
8 is set to have a uniform diameter over the entire length. For this reason, the circulating flow rate in the pipe 88 is the same in any part, and the static pressure acting on the reserve tank 90 side is at the connection between the first and second bypass pipes 98 and 100 and the pipe 88. Become equal. Therefore, there is no pressure difference between the inflow port and the outflow port of the reserve tank 90, and the hot water circulated along the first circulation path 82 can be reliably prevented from flowing into the reserve tank 90, The water temperature in the reserve tank 90 does not rise.

On the other hand, in the cooling circuit 22, the radiator 10
A water pipe 108 having one end connected to the upper part of the sixth tank 6 has the other end arranged near the bottom in the reserve tank 90. Therefore, when the pressure inside the radiator 106 becomes positive, the water is drained from the radiator 106 to the reserve tank 90 through the water pipe 108, and when the pressure inside the radiator 106 becomes negative, the radiator 106 Rehydration is performed on the side.

In this case, in this embodiment, the hot water circuit 16
Along the first circulation path 82 constituting, for example, 60 ° C.
When the hot water heated to 80 ° C. circulates, the hot water does not flow into the reserve tank 90. Thereby, the water temperature in the reserve tank 90 is effectively maintained at a water temperature of 60 ° C. or lower which is desired for the cooling water of the cooling circuit 22.

Accordingly, the hot water circuits 1 each having a different water temperature
6 and the cooling circuit 22 can be shared by a single reserve tank 90, and the number of parts can be effectively reduced as compared with the case where dedicated reserve tanks are provided for the hot water circuit 16 and the cooling circuit 22, respectively. effective. In addition, the water injection work only needs to be performed on a single reserve tank 90, and the advantage that the water injection work can be performed quickly and easily is obtained.

[0036]

As described above, the heat exchange device for an electric vehicle according to the present invention includes the heating hot water circuit for blowing hot air into the vehicle interior, the cooling circuit for cooling the traveling motor and the battery, and the like. Water replenishment and drainage can be performed to the hot water circuit and the cooling circuit having different water temperatures through a single reserve tank. This makes it possible to reduce the number of parts and to effectively reduce the manufacturing cost as compared with the case where the reserve tanks are individually provided in the hot water circuit and the cooling circuit. In addition, the work of injecting water into the reserve tank only needs to be performed once, and the workability is effectively improved.

[Brief description of the drawings]

FIG. 1 is a partial schematic perspective view of an electric vehicle in which a heat exchange device according to the present invention is incorporated.

FIG. 2 is a schematic diagram illustrating an automatic air conditioner in which a hot water circuit constituting the heat exchange device is incorporated.

FIG. 3 is a schematic configuration explanatory view of the heat exchange device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Heat exchange apparatus 12 ... Electric vehicle 14 ... Cabinet 16 ... Hot water circuit 18 ... Motor 22 ... Cooling circuit 24 ... Auto air conditioner 26 ... Duct main body 28 ... Refrigerant circuit 30 ... Air mixing means 44 ... Heater core 82 ... Circulation path 84, 104 ... water pump 86 ... heat exchanger 88 ... pipe 90 ... reserve tank 94 ... water injection port 96 ... cap 98,100 ... bypass line 106 ... radiator 108 ... water line

Claims (2)

[Claims] 1. A heating hot water circuit for heating air before being blown into a vehicle interior to a predetermined temperature by hot water, a running motor and a battery for supplying electric energy to the running motor are cooled by cooling water. A heat exchanger for an electric vehicle, comprising: a first pump that circulates the hot water along a first circulation path; and a cooling circuit that circulates the hot water along a first circulation path. Heating means for heating the circulated hot water; a first heat exchanger for heating the air by exchanging heat between the hot water and the air before being blown into the vehicle interior; A pipe forming a part of the circulation path and a parallel hot water circuit, and a reserve tank having a water inlet at an upper end thereof; and the cooling circuit sends the cooling water along the second circulation path. And a second pump to circulate Wherein the second heat exchanger cooling water for cooling, heat exchange device for an electric vehicle characterized by having a water conduit which communicates the upper and the said reserve tank of the second heat exchanger. 2. The heat exchange device according to claim 1, wherein said hot water circuit has an inlet side first end connected to said pipe line and another end connected to the vicinity of an upper portion of said reserve tank.
A bypass pipe, and an outlet-side second bypass pipe having one end communicating with the pipe and the other end communicating near the lower part of the reserve tank, wherein the reserve tank is located above the pipe. A heat exchange device for an electric vehicle, wherein the heat exchange device is disposed in a vehicle.