JPH09116285A - Electric apparatus equipment for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve cooling efficiency without increasing size, by installing a first cooling means for cooling a heat receiving board, and a second cooling means for cooling the inside of a sealing chamber. SOLUTION: A cooling path is formed in a heat receiving board 6, and a pipe path 10 is so connected with the inlet and the outlet that a closed loop is formed. A circulation pump 11 and a radiator 12 are connected with the middle part of the pipe path 10. The pipe path 10, the circulation pump 11 and the radiator 12 constitute a first cooling means in which water is enclosed. A heat absorbing part 14 equipped with many fins is arranged on the sealing chamber 3 side of a heat pipe 13. On the open chamber 4 side, a radiating part 15 equipped with many fins is arranged. Thus a second cooling means is constituted. The heat generated from a self-extinction type semiconductor element 7 or the like in the sealing chamber 3 is directly or indirectly cooled, so that cooling efficiency is improved. Thereby it can be evaded that the size of an electric apparatus equipment for vehicle is increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular electric equipment device, and more particularly to a vehicular electric equipment device having a control box having a sealed chamber.

[0002]

2. Description of the Related Art Conventionally, in a vehicular electric equipment device having a control box having a closed chamber, a structure for cooling the electric equipment housed in the closed chamber is disclosed in, for example, Japanese Patent Laid-Open No. 2-194597.
There is a structure described in the publication.

[0003]

The above-mentioned conventional structure does not take into consideration the case where the amount of heat generated by the electric equipment is large, and has the problem of increasing the size of the electric equipment for the vehicle.

An object of the present invention is to provide an electric device for a vehicle which can improve the cooling efficiency without increasing the size.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to cool a heat receiving plate in a vehicle electric device apparatus in which a control box having a closed chamber for accommodating an electric device supported by a heat receiving plate is supported under the floor of a vehicle body. This can be achieved by providing the first cooling means for controlling and the second cooling means for cooling the closed chamber.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIG.

The control box 2 supported under the floor of the vehicle body 1 forms a closed chamber 3 and an open chamber 4 in the vehicle width direction. The closed chamber 3 is kept airtight by the ceiling plate 2T of the control box 2, the bottom plate 2L, the inspection cover 3C, the partition wall 5, and the heat receiving plate 6 that closes the openings 5H of the partition wall 5. And in the closed chamber 3,
For example, an IGBT (insulated gate type bipolar transistor) supported by the heat receiving plate 6 and constituting a control main circuit
Electrical equipment such as a self-extinguishing type semiconductor device 7, a filter capacitor 8, a gate drive 9 and the like are housed.

A cooling passage (not shown) is formed in the heat receiving plate 6, and a pipe 10 is connected to the inlet and outlet thereof so as to form a closed loop. A circulation pump 11 and a radiator 12 are connected in the middle of the pipeline 10. These conduits 10, the circulation pump 11, and the radiator 12
And constitute a first cooling means in which water is enclosed.

On the other hand, a heat pipe 13 penetrating the partition wall 5 and extending over the closed chamber 3 and the open chamber 4 is located at a position close to the ceiling plate 2T of the control box 2. The heat absorbing part 14 having a large number of fins is arranged on the closed chamber 3 side of the heat pipe 13, and the heat radiating part 15 having a large number of fins is arranged on the open chamber 4 side to form a second cooling means. doing.

A cooling fan 1 is provided in the open chamber 4.
6 is installed, an intake port 17 is provided below the control box 2 facing the cooling fan 16, and an exhaust port 18 is provided in the ceiling plate 2T. The radiator 12 that radiates the heat of the heat receiving plate 6 is installed on the windward side of the cooling fan 16.

In the above structure, when the vehicle is driven, the electric devices such as the self-arc-extinguishing semiconductor device 7, the filter capacitor 8 and the gate drive 9 generate heat as power is applied, but the self-arc-extinguishing semiconductor device 7 is generated. The heat is transferred to the heat receiving plate 6, the heat is transferred to the water circulating in the cooling path of the heat receiving plate 6, is radiated by the radiator 12, and is discharged from the exhaust port 18 to the outside of the control box 2.

Further, the heat radiated from other electric equipment including the self-arc-extinguishing type semiconductor device 7 into the closed chamber 3 is accumulated in the upper part of the closed chamber 3, where the heat absorbing portion 1 of the heat pipe 13 is located.
4, there is heat absorption there, and the heat dissipation part 1 on the open chamber 4 side
5 to be discharged to the outside of the control box 2 in the same manner as the first cooling means. When the cooling efficiency of the heat pipe 13 cannot be expected, the ventilation direction of the cooling fan 16 is sucked in through the exhaust port 18 and discharged through the intake port 17, so that the outside air taken in is directly applied to the heat radiating portion 15. Therefore, the heat dissipation in the heat radiating portion 15 can be increased and the temperature rise in the sealed chamber 3 can be suppressed. In this way, the heat generated from the self-extinguishing type semiconductor element 7 and the like in the closed chamber 3 is directly and indirectly cooled, so that the cooling efficiency is improved and the enlargement of the electric device for vehicle is avoided. be able to.

In the above embodiment, a so-called water cooling system in which water is circulated is used as the first cooling means, and the heat pipe 13 is used as the second cooling means. It is necessary to install the heat absorbing unit 14 at a height equal to or higher than the same position, and the installation position is limited. If there is a restriction on the installation of the heat pipe 13 as described above, the second
A water cooling system may be used as the cooling means.

The case where the water cooling system is used as the second cooling means will be described below with reference to FIG. In FIG. 2, FIG.
The same reference numerals indicate the same parts as those in FIG. 1, and thus their repetitive description will be omitted.

In FIG. 2, the second cooling means has a heat absorbing pipe 19 provided with a large number of fins at substantially the same position as the heat absorbing portion 14 of the heat pipe 13 in the closed chamber 3, and the both ends thereof are provided with the heat absorbing pipes 19. The pipe 20 is connected to the closed loop through the partition wall 5. The circulation pump 12 is also provided in the middle of the pipeline 20.
And the radiator 22 are connected. These endothermic pipes 1
9, the pipe 20, the circulation pump 21, and the radiator 22 constitute second cooling means in which water is sealed. And
The radiator 12 that radiates the heat of the heat receiving plate 6 is installed on the leeward side of the radiator 22 of the second cooling means.

As in the above structure, the second cooling means has a structure in which water is forcedly circulated by the circulation pump 12,
There is no restriction on the arrangement that the radiator 22 is installed at a height equal to or higher than that of the heat absorbing pipe 19.

By the way, in each of the above-mentioned embodiments, the first and second cooling means are made to function simultaneously when the vehicle is in operation. However, in a vehicle traveling in a snowy region in winter, underfloor control is performed. Since the box 2 is cooled from the periphery, the temperature rise in the closed chamber 3 can be suppressed to a low level.
In such a state, it is not necessary to operate the second cooling means.

Therefore, as shown in FIG. 2, a temperature sensor 23 is provided close to the ceiling plate 2T side in the closed chamber 3, and when the temperature detected by the temperature sensor 23 exceeds a predetermined value, the second cooling means is provided. The drive command means 24 for giving a drive command to the circulation pump 21 is provided. With this, the second cooling means can be made to function according to the state of temperature rise in the closed chamber 3, so that economical cooling can be performed. However, when the second cooling means is a heat pipe, the circulation pump 21 is not necessary, and therefore it is not necessary. Even when the cooling liquid is forcedly circulated, if the temperature in the closed chamber 3 is less than the predetermined value, the circulation speed of the cooling liquid is set slower than in the steady state, and when the temperature exceeds the predetermined value. You may make it switch to a steady circulation speed.

FIG. 3 shows another embodiment according to the present invention in which the cooling efficiency of the second cooling means shown in FIG. 2 is further improved. In FIG. 3, the same reference numerals as those in FIG. 2 indicate the same parts, so that the description thereof will be omitted.
The heat absorbing pipe 1 is provided on the suction side of the stirring fan 25.
9 was installed.

With the above-described structure, the heat generated by the electric equipment in the closed chamber 3 conventionally rises to the upper part by natural convection, but forcibly causes convection to rise, and forcibly contacts the heat absorbing pipe 19. As a result, the heat transfer efficiency can be improved and the cooling efficiency can be improved.

By the way, depending on the structure, capacity, etc. of the applied electric equipment, a heat pipe is used for each of the first and second cooling means, or a heat pipe is used for the first cooling means, and the second cooling means is used. It is also possible to use a water cooling system. Also, the cooling medium is not limited to water.

[0022]

As described above, according to the present invention, it is possible to obtain the electric device for vehicle which can improve the cooling efficiency without increasing the size.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view showing a first embodiment of a vehicle electric device apparatus according to the present invention.

FIG. 2 is a vertical cross-sectional front view showing a second embodiment of the vehicle electrical equipment device according to the present invention.

FIG. 3 is a vertical cross-sectional front view showing a third embodiment of the vehicle electrical equipment device according to the present invention.

[Explanation of symbols]

1 ... vehicle body, 2 ... control box, 3 ... closed chamber, 4 ... open chamber, 6 ...
Heat receiving plate, 7 ... Self-extinguishing type semiconductor element, 8 ... Filter capacitor, 9 ... Gate drive, 10, 20 ... Pipe line, 1
1, 21 ... Circulation pump, 12, 22 ... Radiator, 13 ... Heat pipe, 16 ... Cooling fan, 19 ... Endothermic pipe, 2
3 ... Temperature sensor, 24 ... Drive command means, 25 ... Stirring fan.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Heikichi Kuwahara 502 Jinritsucho, Tsuchiura-shi, Ibaraki Hiritsu Manufacturing Co., Ltd.Mechanical Research Laboratory (72) Inventor Atsushi Suzuki 502 Jinritsucho, Tsuchiura-shi, Ibaraki Hiritsu Manufacturing Co., Ltd. Inside the Mechanical Research Laboratory (72) Inventor Takashi Tsuboi 1070 Ige, Hitachinaka City, Ibaraki Hitachi Ltd. Mito Plant (72) Inventor Hiroshi Itanabi 2nd Day System Plaza Katsuta Hitachi Mito Engineering at 832 Horiguchi, Hitachinaka City, Ibaraki Prefecture Alling Co., Ltd. (72) Inventor Hisashi Kondo 1070 Ichimo Ichi, Hitachinaka City, Ibaraki Prefecture Hitachi Ltd. Mito Plant (72) Inventor Hideharu Saito 1070 Ichige Ichika Hitachinaka City, Ibaraki Hitachi Ltd. Mito Plant (72) Inventor Nobuaki Mizuguchi 1070 Ichige, Hitachinaka City, Ibaraki Prefecture Stock Association Hitachi Mito in the factory

Claims (7)

[Claims] 1. A vehicular electric device apparatus in which a control box having a closed chamber accommodating an electric device supported by a heat receiving plate is supported under the floor of a vehicle body, and first cooling means for cooling the heat receiving plate, An electric device apparatus for a vehicle, comprising: a second cooling means for cooling the closed chamber. 2. A vehicular electric device apparatus comprising a control box having a closed chamber for accommodating an electric device supported by a heat receiving plate, said first cooling means for cooling said heat receiving plate in an electric device apparatus for a vehicle. An electric device apparatus for a vehicle, comprising: second cooling means for cooling an upper portion of the closed chamber, wherein the heat radiating portions of the cooling means are arranged in a common cooling air passage. 3. The first cooling means has a cooling liquid circulation path for forcibly circulating the cooling liquid by a pump in the heat receiving plate, and the second cooling means is a heat pipe facing the closed chamber. The electric device apparatus for a vehicle according to claim 1 or 2, further comprising: 4. The first cooling means has a first cooling liquid circulation passage for forcibly circulating a cooling liquid by a pump in the heat receiving plate, and the second cooling means has a pump in the closed chamber. 3. The electric device apparatus for a vehicle according to claim 1 or 2, wherein the second cooling liquid circulation path for forcedly circulating the cooling liquid is exposed. 5. The heat dissipation portion of the first cooling means is the second heat dissipation portion.
The electric device apparatus for a vehicle according to claim 2, wherein the cooling device is arranged on a leeward side of the cooling air passage with respect to a heat radiating portion of the cooling means. 6. A vehicular electric device apparatus comprising a control box having a closed chamber for accommodating an electric device supported by a heat receiving plate, the first cooling means for cooling the heat receiving plate in an electric device apparatus for a vehicle. Second cooling means for forcibly circulating and cooling the cooling liquid in the closed chamber, means for detecting the temperature in the closed chamber, and the second cooling means when the detection value of the temperature detection means reaches a predetermined value. An electric device device for a vehicle, comprising: means for giving a drive command. 7. A vehicular electric device apparatus comprising a control box having a closed chamber for accommodating an electric device supported by a heat receiving plate, the first cooling means for cooling the heat receiving plate in an electric device apparatus for a vehicle. An electric device apparatus for a vehicle, comprising: a second cooling unit that cools the sealed chamber; and a unit that stirs air in the sealed chamber.