JPH09130074A - Cooling device for electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To thinly form a heat receiving plate without lowering cooling efficiency by a method wherein the mounting part of an electric machine is provided between the heat receiving plate and a refrigerant flow path. SOLUTION: The heat generated on a self-extinguishing type element 12 and a snuffer resistor 13 during operation is transmitted to heat receiving plates 6A and 6B, the heat moves by transmitting to the refrigerant, e.g. water, which is forcedly circulated in the first refrigerant path and the second refrigerant flowing path. The water, which is heated up by absorbing heat, flows as shown by the arrows in the diagram, and it is cooled by radiation from a heat radiating part 11 where heat is exchanged by the outside air. The cooled water is sent out to the refrigerant flow path in the heat-receiving plates 6A and 6B by a circulation pump 10, and the self-extinguishing type element 12 and the snubber resistor 13 are continuously cooled. As the heat-receiving plates 6A and 6B are provided in such a manner that the mounting part of the first and the second refrigerant flow paths and the mounting part of the electric machine are provided separately, the heat-receiving plates 6A and 6B can be formed small in size.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for an electric device, and more particularly to a cooling device for an electric device in which the electric device is mounted on both sides of a heat receiving plate having a refrigerant passage for circulating a refrigerant.

[0002]

2. Description of the Related Art Conventionally, as a structure for cooling electric equipment,
A configuration in which electric equipment is mounted on both sides of a heat receiving plate having a refrigerant flow path for circulating a refrigerant to cool the refrigerant is disclosed in, for example, Shokai Sho 64-5229.
No. 6 is described.

[0003]

In the above structure, no consideration has been given to the attachment of electric equipment to the heat receiving plate. That is, a screw hole for mounting an electric device must be provided so as not to reach the refrigerant channel inside the heat receiving plate, and the plate thickness of the heat receiving plate from the refrigerant channel to the surface in order to provide a screw hole with a necessary depth. Therefore, there is a problem that the heat transfer path from the surface of the heat receiving plate to the refrigerant flow path becomes long and the cooling efficiency is lowered.

An object of the present invention is to provide a cooling device for electric equipment which can reduce the thickness of the heat receiving plate without lowering the cooling efficiency.

[0005]

In order to achieve the above object, the present invention provides a cooling device for an electric device in which electric devices are mounted on both sides of a heat receiving plate having a refrigerant passage for circulating a refrigerant. The mounting portion of the electric device is provided between the coolant channels.

According to the above construction, since the electric device can be attached to the fixed mounting portion avoiding the refrigerant passage inside the heat receiving plate, the plate thickness of the heat receiving plate from the refrigerant passage to the surface is reduced. In addition, since the heat transfer path from the surface of the heat receiving plate to the refrigerant flow path is shortened, the transferred heat is immediately cooled and the cooling efficiency can be improved.

[0007]

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

A control box 2 is mounted under the floor of a vehicle body 1 of a railway vehicle, and a closed chamber 3 and an open chamber 4 are formed in the control box 2 along the vehicle width direction. The closed chamber 3 and the open chamber 4 are partitioned by the partition wall 5 of the control box and the heat receiving plates 6A and 6B.

As shown in FIG. 2, each of the heat receiving plates 6A and 6B is made of, for example, an aluminum material.
6B has a first refrigerant channel group 8A and a second refrigerant channel group 8B, respectively. The first refrigerant flow channel group 8A and the second refrigerant flow channel group 8B are formed with a solid portion having a size of T ₁ separated from each other, and the first refrigerant flow channel group 8A and the second refrigerant flow channel group 8B are on the end side. The above T ₁
A solid portion having a size of T _{2 which} is about half the size is provided, and these solid portions serve as mounting portions for electric devices. The mounting portion is provided with a mounting screw hole 7S and a wiring through hole 7H.

Then, the first of each of the heat receiving plates 6A and 6B
The refrigerant flow channel group 8A and the second refrigerant flow channel group 8B are put together at both ends by headers (not shown), and the refrigerant pipes 9 are connected to both headers to form a closed loop. A circulation pump 10 and a heat radiating portion 11 are provided in the middle of the refrigerant pipe 9. The heat dissipation part 11 is provided on the side wall of the control box 2 so as to be exposed to the outside.

Each heat receiving plate 6A, 6 formed as described above
On the surface of the closed chamber 3 side of B, a main circuit of an inverter device, which is a control device of an induction motor for a vehicle, is formed, for example, IGB.
T (insulated gate type bybo rattan transistor) and GTO
A self-extinguishing element 12 such as a (gate turn-off thyristor) is provided in the first refrigerant flow channel group 8A and the second refrigerant flow channel group 8A.
A plurality of screws B are arranged so as to face B, respectively, and screws B penetrating through the mounting legs are screwed into the screw holes 7S to be fixed.

On the other hand, a snubber resistor 13 is attached to the surface of each heat receiving plate 6A, 6B on the side of the open chamber 4 in the same manner as the self-extinguishing element 12. In addition, an electric component 14 that forms a snubber circuit together with the snubber resistor 13 is installed in the open chamber 4. Further, the heat receiving plates 6A, 6
The self-extinguishing element 12 and the snubber resistor 13 are connected by a wiring 15 penetrating the through hole 7H of B.

With the above construction, the heat generated from the self-extinguishing element 12 and the snubber resistor 13 during operation is transferred to the heat receiving plates 6A and 6B, and the first refrigerant flow path group. 8A and the second refrigerant channel group 8B are transferred by being forcibly circulated in the refrigerant, for example, water. The water that has absorbed the heat and has increased in temperature flows as shown by the arrow, and is radiated from the heat radiating portion 11 that exchanges heat with the outside air to be cooled. The cooled water is sent again to the refrigerant flow path in each of the heat receiving plates 6A and 6B by the circulation pump 10 so that the self-extinguishing element 12 is continuously connected.
Then, the snubber resistor 13 is cooled.

By the way, since each of the heat receiving plates 6A and 6B is provided separately from the installation portion of the first refrigerant flow channel group 8A and the second refrigerant flow channel group 8B and the mounting portion of the electric device, The dimension T ₃ from the refrigerant flow channel groups 8A, 8B to the surface of the heat receiving plate can be thinned without being aware of the screw holes 7S, and as a result, the heat receiving plates 6A, 6B can be downsized. Further, since the dimension T ₃ becomes thin, the self-extinguishing element 12 and the snubber resistor 1
The heat from 3 can be immediately transferred to the circulating cooling water,
The cooling efficiency is improved accordingly.

Further, since the mounting portion of the electric equipment is provided separately, the through hole 7H can be provided by utilizing this mounting portion, and as a result, the self-extinguishing members mounted on the front and back sides of the heat receiving plates 6A, 6B are removed. The arc-shaped element 12 and the snubber resistor 13 can be connected in the shortest distance, and the wiring inductance can be reduced.

The above embodiment describes a cooling device for electric equipment in a control box installed under the floor of a vehicle.
The invention is not particularly limited to vehicles, and can be applied as a cooling device for general electric equipment.

Further, in the above embodiment, the heat radiating portion 11 has a structure for exchanging heat by natural convection of the outside air, but in order to further improve the cooling efficiency, the wind tunnel on the side of the heat radiating portion 11 facing the outside air. 16 may be formed, and outside air may be forcedly forced into the wind tunnel 16 by the blower 17.

In the above embodiment, an example was described in which water was used as the refrigerant circulating in the first and second refrigerant channel groups 8A, 8B, but the invention is not limited to water, and air or other refrigerants are used. May be used.

Although the heat receiving plates 6A and 6B having the two refrigerant flow channel groups 8A and 8B have been described, a single heat receiving plate may be used, or a plurality of finely formed heat receiving plates may be used. You may use. The shapes and sizes of the refrigerant flow channel groups 8A and 8B are also appropriately determined according to the heat generation amount of the electric device to be cooled, and are not limited to the embodiments.

[0020]

As described above, according to the present invention, it is possible to obtain a cooling device for electric equipment in which the plate thickness of the heat receiving plate can be reduced without lowering the cooling efficiency.

[Brief description of the drawings]

FIG. 1 is a schematic vertical sectional front view showing an embodiment of a cooling device for electric equipment according to the present invention.

2 is a partially enlarged view of the heat receiving plate in FIG.

[Explanation of symbols]

6A, 6B ... Heat receiving plate, 8A, 8B ... Refrigerant flow path group, 9 ... Refrigerant pipe, 10 ... Circulation pump, 11 ... Radiating section.

 ─────────────────────────────────────────────────── ─── 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 (6)

[Claims] 1. A cooling device for an electric device in which an electric device is mounted on both sides of a heat receiving plate having a refrigerant flow path for circulating a refrigerant, wherein a mounting portion for the electric device is provided between the refrigerant flow paths of the heat receiving plate. A cooling device for electric equipment. 2. A cooling device for an electric device in which electric devices are mounted on both sides of a heat receiving plate having a refrigerant flow path for circulating a refrigerant, wherein the refrigerant flow path is formed at a position different from a mounting portion of the electric device. A cooling device for electric equipment, characterized in that 3. A cooling device for an electric device in which electric devices are attached to both sides of a heat receiving plate having a refrigerant flow path for circulating a refrigerant, wherein an electric device attached to one side of the heat receiving plate and an electric device attached to the other side of the heat receiving plate. Attach it to the position facing the device,
A cooling device for an electric device, wherein the refrigerant flow path is formed at a position different from a mounting portion of the electric device. 4. The heat receiving plate has a through hole in a mounting portion of the electric device, and an electric device mounted on both surfaces of the heat receiving plate is connected to the through hole through a wire. 2. A cooling device for electric equipment according to 2 or 3. 5. A control box supported under the floor of a vehicle body, a closed chamber partitioned by heat receiving plates in the control box, electric equipment mounted on both sides of the heat receiving plate, and the heat receiving plate. In a cooling device for electric equipment provided with a cooling means for cooling heat, the cooling means is a refrigerant flow path formed at a position different from a mounting portion of the electric equipment of the heat receiving plate, and both ends of the refrigerant flow path. Of a refrigerant pipe connected to the to form a closed loop, a circulation pump that circulates the refrigerant in the refrigerant pipe and the refrigerant flow path, and a heat dissipation portion that is provided in the middle of the refrigerant pipe and is in contact with the outside air Cooling system. 6. The electric device attached to the surface of the heat receiving plate on the inner side of the closed chamber is a self-extinguishing element forming an inverter control circuit, and the electric device attached to the surface on the opposite side of the heat receiving plate. The device is a snubber resistor that constitutes an inverter control circuit, and these self-extinguishing element and snubber resistor are connected by wiring through a through hole provided in the mounting part of the electric device of the heat receiving plate. The cooling device for an electric device according to claim 5, wherein: