WO1993014507A1

WO1993014507A1 - Device for cooling transformer mounted on electric vehicle

Info

Publication number: WO1993014507A1
Application number: PCT/JP1992/000558
Authority: WO
Inventors: Michitada Endo
Original assignee: Mitsubishi Denki Kabushiki Kaisha
Priority date: 1992-01-17
Filing date: 1992-04-28
Publication date: 1993-07-22
Also published as: EP0551554A1; TW208680B; KR937003691A; KR960013032B1

Abstract

A cooling device for a transformer mounted on an electric vehicle the installation position of which is not limited inside the electric vehicle, and which is non-inflammable and safe. The cooling device includes a cooler (23) of a cooling medium (25) for cooling a transformer (21), and a circulation blower (22) disposed inside a piping (24) connected between the transformer (21) and the cooler (23), for circulating the cooling medium between the transformer and the cooler. The cooling medium (25) is an SF6? gas, the cooler is disposed on the side wall, top wall, or front or rear end wall of the body of an electric vehicle (1) and is cooled by the blower or running wind. Accordingly, the cooling device becomes non-inflammable, the installation spaces of other electric appliances becomes greater, and freedom of design of the installation of the cooler increases. The noise can be reduced by disposing the gas circulation blower inside the transformer tank, and on-site sealing operation of the cooling medium gas can be eliminated by disposing an openable connection portion at an intermediate portion of the cooling medium piping.

Description

Akira Transformer cooling system for electric vehicles

Industrial applications

The present invention particularly relates to a cooling device for a transformer mounted on an electric locomotive such as an electric locomotive.

FIGS. 12 and 13 show the conventional electrical equipment described in, for example, “Electrical equipment of the three-phase DB class E 10 universal main-line locomotive; Rail Engineering International July / September 1979”. This is a cooling method for transformers mounted on locomotives. 1 is an electric vehicle such as an electric locomotive, 2 is a floor which is a frame of the electric vehicle 1, 3 is a framework of the electric vehicle 1 and a side wall 3a. It is a car body wall composed of the top wall 3b and the front and rear end walls 3. 1 1 is a transformer mounted on the lower surface of floor 2, 1 2 is an oil pump, 13 is an oil cooler installed on the electric vehicle floor 2, and 14 is an oil pipe And 15 are cooling oils with electrical insulation. Also, 16 is a blower of oil cooler 甩-17 is an outside air that flows from under the floor through oil cooler 13 and top wall 3 b. Air ducts discharged from the plant, 18 is a conservator, and 19 is various electrical equipment other than transformers.

In FIGS. 12 and 13, during operation of the electric vehicle, heat generated from the transformer 11 is absorbed by the cooling oil 15 and the cooling oil 15 is heated. The cooling oil 15 heated to a high temperature by this heating is sent to the oil cooler 13 through the oil pipe 14 by the oil feed pump 12, where it is blown by the blower 16. It is cooled by an external air flow supplied by the air. External air ripened through the oil cooler 13 passes through the air duct 17 and is discharged outside through the top wall 3b, which is the roof of the vehicle body. The cooling oil 15 cooled down and cooled down is supplied to the transformer 11 again through the oil supply pipe to cool the transformer 11. A condenser 18 is provided to absorb the expansion and contraction of the cooling oil 15 caused by heat. Problems to be solved by the invention

In the conventional cooling device for a transformer mounted on an electric vehicle configured as described above, oil is used as a refrigerant. Therefore, transformers are classified as flammable, which is not preferred in terms of vehicle fire safety. In addition, since the transformer and the cooler are separated and installed separately, the transformer and the cooling There is also a risk of fire in the piping and cooler connecting to the heat sink. Furthermore, as the length of the pipes increases, the weight of the cooling oil also increases, and the weight of the pipes that support them also increases, and the weight of the entire electric vehicle also increases. I do. Furthermore, since oil is incompressible, a large conservator is needed to absorb the expansion and contraction of cooling oil due to temperature changes in transformers and coolers. Installation becomes very difficult.

For this reason, even when the cooler is installed separately from the transformer, the cooler must be installed relatively close to the transformer in practical use, and the installation position of the cooler is limited. Therefore, the degree of freedom in the layout design of other electric devices in the locomotive was reduced.

An object of the present invention is to solve the above-described problems of the conventional cooling device for an electric vehicle mounted transformer, and the installation position of the cooler in the electric vehicle is not limited. The purpose of the present invention is to obtain a safe cooling device for a transformer mounted on an electric vehicle, which can be installed relatively freely in a space not occupied by equipment, and the transformer 'and a cooling device for the transformer are nonflammable and safe.

Means to solve the problem

According to the cooling device for an electric vehicle mounted transformer of the present invention, The refrigerant that cools the transformer is SF 6 gas, and a cooler for cooling the refrigerant is provided on the vehicle body wall of the electric vehicle.

According to this invention, the refrigerant for cooling the transformer is SF ₆ gas, and the refrigerant cooler is provided on the vehicle body wall of the electric vehicle, so that the transformer and the cooling device are nonflammable. And safety is extremely enhanced. Since the specific gravity of the refrigerant is about 1 Z60 of that of mineral oil, the weight increase is small even if the piping in the cooling device becomes long. Further, since the refrigerant is compressible, a condenser is not required, and the installation of the transformer in the electric vehicle body is not hindered by the condenser even if the pipe length is long. In addition, since the cooler can be mounted on the vehicle body wall of the electric vehicle, the cooler can be effectively cooled using the traveling wind. BRIEF DESCRIPTION OF THE FIGURES

The present invention will be more clearly understood from the following description of the embodiments of the present invention with reference to the accompanying drawings.

FIG. 1 is a schematic side view of an electric vehicle equipped with a cooling device for a transformer mounted on an electric vehicle according to the present invention.

FIG. 2 is a schematic front view of the electric vehicle shown in FIG. 1,

Fig. 3 shows a cooling system for an electric vehicle mounted transformer of the present invention. Schematic side view of the electric car,

Fig. 4 is a schematic front view of the electric car shown in Fig. 3,

Fig. 5 is a schematic perspective view of an electric car with a cooler attached to the top wall of the car body.

Fig. 6 is a schematic perspective view of an electric car with a cooler attached to the front and rear end walls of the vehicle.

Fig. 7 is a schematic perspective view of an electric car with a cooler attached to the side wall of the vehicle.

Fig. 8 is a schematic perspective view of an electric car with a heat pipe attached to the side wall of the vehicle.

Fig. 9 is a schematic perspective view showing a transformer with a built-in circulation probe.

FIG. 10 is a schematic perspective view showing a transformer in which only the fan portion of the circulation blower is built in,

FIG. 11 is a diagram showing the circulation blower of FIG. 10, FIG. 12 is a schematic sectional view showing a connection portion of a refrigerant pipe, and FIG. 13 is a conventional cooling device for a transformer mounted on an electric vehicle. Schematic side view of an electric car equipped with

FIG. 14 is a schematic front view of the electric vehicle shown in FIG. Example

1 and 2, an electric locomotive 1 such as an electric locomotive includes a floor 2 serving as a body frame and a vehicle body wall 3 provided on the floor 2. The vehicle body wall 3 includes a vehicle body side wall 3a rising from the floor 2, a vehicle body side wall 3a, a vehicle body top wall 3 extending as a roof, and front and rear end walls 3c of the vehicle body. The electric vehicle 1 has a transformer 21 mounted on the underside of the floor 2 of the electric vehicle 1. The transformer 21 has an iron core 2 lb and a coil 21 c housed in a tank 21 a.

The cooling system of the transformer for electric vehicles is connected to the tank 21a of the transformer 21 and the circulating blower 22 cools the refrigerant 25 in the tank 21a. It has a pipe 24 for sending to The piping 24 is provided with an openable / closable connection part 31 which is open during operation, as will be described in detail later with reference to FIG. The refrigerant 25 cools the core 21b and the coil 21c of the transformer 21 by removing the heat of the core 21b. The cooler 23 cools the refrigerant 25 sent by the pipe 24 after being heated by the transformer 21. The refrigerant 25 is cooled by the external air passing therethrough by the cooler 23, supplied to the transformer 21 by the return pipe 24, and cools the transformer again. In the cooling device for a transformer mounted on an electric vehicle according to the present invention, the refrigerant 25 is SF ₆ gas. In addition, a cooler 23 is provided on the vehicle body wall 3 of the electric vehicle 1. In the example shown in the figure, the cooler 23 has approximately the same thickness as the vehicle body side wall 3a, and is embedded and mounted inside the ventilation openings of the vehicle body side walls 3a on both sides. It does not reduce the effective volume in the room surrounded by 3c or 3c. Further, the cooler 23 is provided with a blower 27 for sending external air to the main motor 26 through a duct 28 to cool the main motor 26 provided below the floor 2. It is provided in the air passage. Therefore, the cooler

23 is cooled by the flow of external air generated by the blower 27, and a dedicated blower for the cooler 23 is not required.

3 and 4 show another embodiment of the present invention. In this embodiment, the cooler 33 is provided on the vehicle body top wall 3b. In other words, the cooling device for the transformer mounted on the electric vehicle is connected to the tank 31a of the transformer 31 and the refrigerant in the tank 31a is connected to the circulation blower 32 by the circulation blower 32. To the cooler 33. The refrigerant 35 cools by removing the heat of the iron core 31 b and the coil 31 c of the transformer 31. Refrigerant

35 passes through piping 34 and passes through cooler 33 Cooled by the external air, supplied to the transformer 31 via the return pipe 34 and cooled again.

In the cooling device for a transformer mounted on an electric vehicle according to the present embodiment, a cooler 33 is provided so as to be embedded in a vehicle body top wall 3b which is a roof of the electric vehicle 1. Is provided in an air duct 39 for cooling a cooler 38 of another electric device 36 such as a power conversion device, and is provided to the outside air by a blower 37 in the air duct 39. It is more cooled. Therefore, the cooler 33 does not occupy the volume in the electric cabin, and the cooler 33 does not require a dedicated blower.

The size of the SF ₆ gas cooler must be larger than that of the oil cooler, but since the cooler can be installed on the body wall instead of on the floor, other electric equipment It does not hinder the installation of the equipment, but rather allows other electrical equipment to be installed in the place where the conventional cooler was installed, so that the floor surface that can be used effectively is expanded. Moreover, the walls can be used effectively. The body wall 3 such as the side wall 3a or the top wall 3b of the car body is wrapped with car body structural material and usually has a constant thickness, so the cooler is the same as the car body wall 3 thickness. The thickness of the cooler is reduced by Can be implanted in the body wall.

In the cooling device for a transformer mounted on an electric vehicle according to the present invention shown in FIGS. 5 to 8, the cooler is mounted on the vehicle body wall 3 so that the air flow generated by the traveling of the electric vehicle can be improved. A traveling wind intake device is provided to receive the traveling wind and generate an airflow that passes through the cooler. Therefore, a cooling blower for the cooler is unnecessary, there is no noise from the blower, no maintenance or repair of the blower is required, and no power is required for the operation of the blower.

In the example of FIG. 5, a plurality of coolers 43 are provided so as to protrude from the upper surface of the vehicle body top wall 3b to the outside, and each cooler 43 is provided with an airflow from the front cooler 43. They are staggered so that they can fully receive the new and 'cold' running wind 41. The spacing between the cooling fins of the cooler 43 or the tubes so that the gap between the fins or tubes of the cooler 43 does not cause clogging by foreign matter Is relatively large.

In the embodiment of FIG. 6, the cooler 53 is provided on the front and rear end walls of the vehicle body. A switching valve 54 is provided in the pipe 24 between the cooler 53 and the transformer 21.The switching valve 54 is switched according to the traveling direction of the electric vehicle. Change the direction of travel On the other hand, the front cooler 53 is connected to the transformer 21 so that the refrigerant circulates. Since a large amount of traveling wind 41 hits the cooler 53 in front, effective cooling can be performed. Therefore, the cooler 53 may be small. The airflow that has passed through the cooler 53 is guided by the exhaust duct 55 as shown by the arrow 42, and passes below the vehicle body floor 2.

In the embodiment of FIG. 7, the cooler 63 is largely embedded in the side wall 3a of the vehicle, and has a traveling air duct having an air intake port 64 opened forward on the side wall 3a of the vehicle. Are stored in 6 65. The coolers 63 are arranged alternately to increase the cooling efficiency. In this case, the height of the cooler 63 protruding from the vehicle body side wall 3a is relatively small, which is advantageous in design.

Fig. 8 shows an example in which a heat exchanger 74 having a heat pipe 73 as a cooler is applied. That is, a heat exchanger 74 is attached to a pipe 24 on the lower surface of the floor 2 extending from the circulation pump 22, and a plurality of heat pipes 75 are provided upward from the heat exchanger 74. It extends along 3a. The refrigerant in the piping 24 is cooled by the traveling wind 41 flowing along the vehicle body side wall 3 a via the heat exchanger 74 and the heat pipe 73. In this case, the vehicle is exposed to running wind on the side wall 3a. The external rejector to be used can be extremely compact.

Fig. 9 shows the detailed structure of the transformer 21 and the circulation blower 22. The transformer 21 includes a tank 21a, an iron core 21 housed in the tank 21a, and a coil 21c wound around the iron core 21b. A circulation blower 22 is provided in the tank 21 a, and an exhaust duct 22 a of the blower 22 is connected to a pipe 24. By operating 22, the refrigerant gas circulates between the transformer 21 and the cooler 23 while cooling the transformer 21. The recirculating blower 22 is attached to a support metal 26 provided on the bottom surface of the tank 2 la via a vibration damping device which is a vibration-proof material 28 such as a suitable rubber. This prevents the vibration of the blower 22 from being transmitted to the sunset 21a and vibrating to generate noise. By arranging the circulation blower 22 in the tank 21a via the vibration damping device, noise generated by the blower 22 is not emitted to the outside. You can do it.

In the embodiment of FIGS. 10 and 11, only the fan 45a of the recirculating probe 45 is in tank 21a together with the blower casing. The motor 4 5b is arranged in the evening The electric motor 45b provided outside the tank 21a is attached to the tank 21a via a hermetically sealed and vibration-proof material 45c. According to this configuration, the fan 4δa, which is the main noise source of the circulation blower 45, is housed in the tank 21a, so that the noise is low. Since b is located outside the tank 21a and can be easily removed, assembly and maintenance are easy.

Fig. 12 schematically shows the connecting part 31 that is provided in the middle of the pipe 24 to facilitate the manufacture, shipping, assembly, maintenance, and inspection of the pipe and the transformer 21 and the cooler 23. It is shown in a diagram. That is, on both ends of the first and second gas pipes 24a and 24b, on-off valves 31a and 31b that can be operated from the outside and seal the refrigerant gas are provided, A flexible connection tube 31c is connected between both ends.

In order to manufacture the cooling device of the transformer for mounting on an electric vehicle of the present invention in a factory, transport it to the site, and mount it on the electric vehicle, the cooling device is formed by a transformer 21, a gas pipe 24, a gas It is necessary to disassemble into the cooler 23 and fill the inside of the transformer 21 and the cooler 23 with SF ₆ gas at the specified pressure. To this end, shut off the on-off valves 31a and 31b at each end of the disconnected piping 24a of the transformer 21 and the cooler 23 by airtightly closing them. The refrigerant gas is sealed inside and transported to the site in this state. At the site, the transformer 21 is mounted on the trolley 2, the cooler 23 is mounted on the vehicle body wall 3, and the pipes 24 are mounted between them. There may be dimensional errors due to manufacturing or installation between the pipes 24, so normal flanges, packing, bot Use a nut or the like to connect more air-tightly with the flexible connection pipe 31c. Next, when all of the on-off valves 31a and 31b are opened, the interior of the transformer 21, the cooler 23, the pipe 24 and the flexible connection pipe 31c communicates. As a result, the gas refrigerant cooling circuit is completed, and the gas refrigerant reaches the entire cooling circuit.

By providing the openable and closable connection part 31 in the middle of the pipe 24 in this way, it is not necessary to perform the work of charging a gas refrigerant at a site such as a vehicle assembly factory, and the outfitting work can be performed. It will be easier. Also, when disassembling or inspecting the cooling device, if the on-off valve 31c of this openable connection 31 is closed, leakage of gas refrigerant can be slightly suppressed. it can. The invention's effect

Ri above description or RaAkira Rakana communication, is at the cooling device for an electric vehicle mounting transformer of the present invention, the transformer of the refrigerant in the SF ₆ As a result, the transformer and the cooling system are nonflammable, and the cooler is provided on the vehicle body wall, so that the effective installation space of the equipment to be installed on the vehicle body floor can be expanded. In addition, since the weight can be reduced and it is nonflammable, the restrictions on the length of the pipes are relaxed and the flexibility of the installation position of the cooler increases, so the cooler can be installed in a more advantageous place. it can. For example, a cooler can be provided in a cooling duct for other electric equipment to serve as a cooling blower, and the traveling wind of an electric car can be used to eliminate the need for a blower. You. If a blower is not used for the cooler, it is advantageous in terms of space, price, weight, etc., and the noise of the electric car can be reduced. By storing a circulation process for the gas refrigerant in the transformer tank, it is possible to further reduce noise. Furthermore, by providing a connection part that can be opened and closed in the middle of the piping, the work of filling the refrigerant gas at the site becomes unnecessary, and the manufacture, transportation, assembly, maintenance, and inspection of the cooling device become easier. .

Claims

The scope of the claims

1. A refrigerant that cools a transformer mounted on an electric vehicle having a floor and a vehicle body wall provided on the floor, a cooler that cools the refrigerant, and a refrigerant connected between the transformer and the cooler. And a circulating process for circulating the refrigerant between the transformer and the cooler through the piping and provided in the pipe. In the cooling system,

The refrigerant Ri SF ₆ Gasudea, the condenser cooling system of an electric vehicle mounting transformer characterized that you provided on the vehicle body wall of the electric vehicle.

2. The electric vehicle according to claim 1, wherein the cooler is provided in a ventilation opening provided in a vehicle body wall of the electric vehicle, and is cooled by an airflow flowing through the vehicle body wall. Cooling device for transformers mounted on electric vehicles.

3. The cooling device for a transformer mounted on an electric vehicle according to claim 2, wherein the cooler is contained within a thickness dimension of the vehicle body wall.

4. The cooling device for a transformer mounted on an electric vehicle according to claim 2, comprising a blower for generating the air flow.

5. The cooling device _c for a transformer mounted on an electric vehicle according to claim 4, wherein the blower is a cooling fan used also for other devices of the electric vehicle.

6. The cooling device for an electric vehicle mounted transformer according to claim 1, further comprising a traveling wind intake device for generating the air flow.

7. The cooling device for a transformer mounted on an electric vehicle according to claim 1, wherein the cooler is provided on a vehicle body side wall of the electric vehicle.

8. The electric vehicle according to claim 1, wherein the cooler is provided in a ventilation opening provided in a vehicle body side wall of the electric vehicle, and is cooled by an air flow flowing through the vehicle body side wall. Cooling system for electric vehicle mounted transformers.

9. Claims comprising a traveling wind duct having an air intake opening in the traveling direction of the electric vehicle to guide traveling wind to the cooler and generate an airflow flowing through the cooler. 8. The cooling device for a transformer mounted on an electric vehicle according to claim 7.

10. The cooling device for a transformer mounted on an electric vehicle according to claim 1, wherein the cooler is provided on a top wall of the vehicle body of the electric vehicle.

1 1. The cooler is slightly less than the top wall of the electric car. 10. The cooling device for a transformer mounted on an electric vehicle according to claim 10, wherein the cooling device is provided so as to partially protrude, and is exposed to an air current caused by running of the electric vehicle.

12. The cooling device for a transformer mounted on an electric vehicle according to claim 1, wherein the cooler is provided on front and rear end walls of a body of the electric vehicle.

13. The cooling device for an electric vehicle mounted transformer according to claim 1, wherein the cooler is a heat pipe connected to the pipe via a heat exchanger.

14. The electric device according to claim 1, wherein the transformer includes a tank surrounding the transformer and containing the refrigerant, and the circulating blower is provided in the tank. Transformer cooling system for car mounting.

15. The cooling device for a transformer mounted on an electric vehicle according to claim 14, wherein the circulating blower is mounted in the tank via a vibration damping device.

16. The claim according to claim 14, wherein the circulating blower is provided with a fan and a motor for driving the fan, and only the fan is provided in the tank. Cooling system for transformers for electric vehicles.

17. The piping between the transformer and the cooler is 2. The cooling device for a transformer mounted on an electric vehicle according to claim 1, further comprising a connection part having an on-off valve and being openable and closable.