Evaporative cooling device for traction transformer of motor train unit

Abstract

An evaporative cooling device for a traction transformer of a motor train unit comprises the traction transformer, a containing cavity, an air outlet pipe, an air collecting chamber, a heat exchanger, a condensation chamber, a fan, a liquid return pipe and a fluorocarbon working medium. The traction transformer is arranged in the containing cavity, the upper portion of the containing cavity is connected with an air outlet pipe, the upper portion of the air outlet pipe is connected with an air collecting chamber, the air collecting chamber is connected with a condensation chamber through a heat exchanger, a plurality of fans are arranged below the heat exchanger, a liquid return pipe is connected below the condensation chamber, and the liquid return pipe is connected with the bottom of the containing cavity. A fluid flow loop is formed. During working, the traction transformer is soaked in a fluorocarbon working medium, fluorocarbon working medium liquid absorbs heat generated by working of the traction transformer, generates phase change and becomes fluorocarbon working medium bubbles, the fluorocarbon working medium bubbles naturally flow upwards and enter the gas collection chamber through the gas outlet pipe, gas in the gas collection chamber flows through the heat exchanger, and the fluorocarbon working medium liquid flows out of the heat exchanger. The fan below the heat exchanger blows out cooling air to cool the fluorocarbon working medium gas in the heat exchanger, the fluorocarbon working medium gas generates phase change condensation and enters the condensation chamber to become liquid, and the gas working medium flows back to the pipe bottom through the liquid return pipe under the action of self gravity after being condensed and liquefied and finally returns to the containing cavity to continue to conduct heat exchange on the traction transformer. And finally, pump-free self-circulation of the cooling system is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of traction transformer, especially a kind of evaporative cooling device suitable for motor train unit traction transformer. BACKGROUND

[0002] Motor train unit on-board traction transformer as high-voltage equipment in motor train system, it is indispensable in high-speed motor train system, on-board traction transformer is transported to electric locomotive traction facility by the form of electromagnetic energy conversion in the high-voltage transmission line on railway electric energy, provides the required electric power energy for locomotive power system, its insulation and heat dissipation performance will directly affect the safe and stable operation of motor train supply system.

[0003] For the temperature rise problem of on-board traction transformer in operation process, the currently generally adopted solution is to use insulating oil cooling technology, but due to the bulkiness of oil-immersed transformer cooling system, it is difficult for on-board traction transformer to develop towards small and light, therefore, in the cooling system design of on-board traction transformer or in the actual operation process of vehicle, the temperature rise problem of system is a main contradiction in the safe and stable and lightweight design of transformer. In addition, considering the flammability of insulating oil, oil-immersed transformer cooling system also becomes a major safety hazard in electric locomotive system. In order to solve the above problems, the utility model provides a traction transformer evaporative cooling device using non-flammable and non-explosive fluorocarbon working medium, and provides a on-board traction transformer coil box structure. SUMMARY

[0004] The utility model solves the technical problem to provide a kind of traction transformer evaporative cooling device using non-flammable and non-explosive fluorocarbon working medium, the device utilizes the large amount of latent heat absorbed by phase change heat transfer of fluorocarbon working medium to take away the heat generated in the core and winding of transformer during operation, reduces the safety hazard of traction transformer.

[0005] The technical scheme for solving the technical problem of the utility model is: a motor train unit traction transformer evaporative cooling device, including traction transformer, containing cavity, gas outlet pipe, gas collection chamber, heat exchanger, condensing chamber, fan, liquid return pipe and fluorocarbon working medium. The traction transformer is arranged in the containing cavity, the containing cavity is connected with the gas outlet pipe at the upper portion, the gas outlet pipe is connected with the gas collection chamber at the upper portion, the gas collection chamber is connected with the condensing chamber through the heat exchanger, a plurality of fans are arranged below the heat exchanger, the condensing chamber is connected with the liquid return pipe at the lower portion, the liquid return pipe is connected with the bottom of containing cavity, to form fluid flow loop.

[0006] The motor train unit traction transformer evaporation cooling device, when working, the traction transformer is soaked in fluorocarbon working medium, the fluorocarbon working medium liquid absorbs the heat generated by the traction transformer during operation, and phase change occurs to become fluorocarbon working medium bubbles, the fluorocarbon working medium bubbles flow upward naturally, enter the gas collecting chamber through the gas outlet pipe, the gas in the gas collecting chamber flows through the heat exchanger, the fan below the heat exchanger blows out cooling air to cool the fluorocarbon working medium gas in the heat exchanger, the fluorocarbon working medium gas phase change condenses to become liquid in the condensing chamber, and the gas working medium condenses and liquefies under the action of its own gravity and flows back to the pipe bottom through the liquid return pipe, and finally returns to the containing cavity to continue heat exchange of the traction transformer, so that the cooling system realizes self-circulation without pump.

[0007] The cover plates on the top and side edges of the traction transformer box body are provided with working medium self-circulation connecting pipes, the high-voltage winding and the low-voltage winding are led out of the junction box on the right side, and the whole body of the device is finally completely sealed by bolt and flange sealing structures. The traction transformer box body is provided with fluorocarbon working medium, and the core type coil is soaked in the fluorocarbon working medium, so that the liquid insulation working medium realizes insulation of the high-voltage winding and the low-voltage winding and the inside of the box body by filling all the gaps in the box body.

[0008] Since the height dimension of the bottom of the motor train unit is usually limited, the traction transformer is horizontally placed on the bottom of the carriage. The traction transformer is wound in a pie type, the high-voltage coil is arranged on the outside of the core column, the low-voltage coil is arranged on the inside of the core column, the high-voltage branches of the two core column windings are connected in series with each other, and the low-voltage branches are connected in parallel with each other, so as to reduce the load loss of the system and the amount of copper in the winding. The high-voltage winding and the low-voltage winding are insulated by an insulation sleeve, and a vertical upward flow channel is formed in the internal insulation structure. The evaporation cooling working medium in the box body is vaporized by absorbing the heat generated in the transformer winding and the core, the bubbles flow upward through the vertical heat dissipation flow channel between the coils, and the vaporized gas working medium flows into the gas collecting chamber through the gas outlet pipe.

[0009] The positive effects of the utility model are as follows: 1. The traction transformer evaporation cooling device in the utility model adopts fluorocarbon working medium as the cooling medium, utilizes the large amount of latent heat absorbed during phase change heat exchange of the fluorocarbon working medium to take away the heat generated in the core and the winding during operation of the transformer, the fluorocarbon working medium itself is non-flammable and non-explosive, has low viscosity, and has good insulation and heat dissipation characteristics, thereby greatly reducing the safety hazards in the motor train unit electric locomotive system. 2. The traction transformer in the utility model is horizontally placed on the bottom of the carriage, thereby reducing the height dimension of the traction transformer and enabling the traction transformer to be better placed on the bottom of the carriage. DRAWINGS

[0010] The utility model will be further described below in combination with the drawings and specific embodiments.

[0011] Figure 1 It is a traction transformer evaporation cooling device connection schematic view.

[0012] Figure 2 Fig. 1 is a schematic diagram of a traction transformer box structure.

[0013] Figure 3 Fig. 2 is a schematic diagram of a traction transformer coil structure.

[0014] In the figure, 1 traction transformer, 2 containing cavity, 3 air outlet pipe, 4 gas collection chamber, 5 heat exchanger, 6 condensing chamber, 7 fan, 8 liquid return pipe, 9 liquid level, 10 fluorocarbon working medium, 11 cover plate, 12 working medium self-circulation connecting pipeline, 13 outgoing line, 14 transformer coil, 15 core column, 16 liquid working medium, 17 gaseous working medium DETAILED DESCRIPTION

[0015] As Figure 1 shown, the utility model discloses a motor train unit traction transformer evaporative cooling device, including traction transformer (1), containing cavity (2), air outlet pipe (3), gas collection chamber (4), heat exchanger (5), condensing chamber (6), fan (7), liquid return pipe (8) and fluorocarbon working medium (10). Containing cavity (2) is set up in traction transformer (1), and the upper portion of containing cavity (2) is connected with air outlet pipe (3), and the upper portion of air outlet pipe (3) is connected with gas collection chamber (4), and gas collection chamber (4) is connected with condensing chamber (6) through heat exchanger (5), and a plurality of fan (7) is arranged below heat exchanger (5), and the bottom of containing cavity (2) is connected with liquid return pipe (8) below condensing chamber (6), and forms working medium flow loop.

[0016] Working principle: motor train unit traction transformer evaporative cooling device when working, traction transformer (1) is soaked in fluorocarbon working medium (10), and fluorocarbon working medium liquid absorbs the heat generated by traction transformer (1) and becomes phase change into fluorocarbon working medium bubble, and fluorocarbon working medium bubble flows upward naturally, enters gas collection chamber (4) through air outlet pipe (3), and the gas in gas collection chamber (4) flows through heat exchanger (5), and fan (7) below heat exchanger (5) blows out cooling air to cool fluorocarbon working medium gas in heat exchanger (5), and fluorocarbon working medium gas produces phase change condensation and enters condensing chamber (6) and becomes liquid, and after gaseous working medium condenses and liquefies, under the action of its own gravity, it flows back to the bottom of the pipe through liquid return pipe (8) and finally returns to containing cavity (2) to continue heat exchange for traction transformer (1), so that the cooling system realizes pump-free self-circulation.

[0017] Fig. 1 is a schematic diagram of a traction transformer box structure. Figure 2The traction transformer box structure schematic diagram, the cover plate (11) on the top and side of the traction transformer box is equipped with the working medium self-circulation connecting pipeline (12), the high and low voltage windings are led out from the wire outlet (13) of the right side terminal box, and the whole body of the device is finally completely sealed by the bolt and flange sealing structure. The traction transformer box is equipped with fluorocarbon working medium (10), and the core type coil is immersed in the fluorocarbon working medium (10), and when running, the liquid insulation working medium realizes the insulation of the high and low voltage windings and the inside of the box by filling all the gaps in the box.

[0018] Figure 3 The traction transformer coil structure schematic diagram is shown in the figure. Figure 3 As the height dimension of the bottom of the motor train unit is usually limited, the traction transformer (1) is horizontally placed on the bottom of the carriage. The transformer coil (14) is wound by pie type winding, the high voltage coil is arranged on the outside of the core column (15), the low voltage coil is arranged on the inside of the core column (15), the high voltage branches of the two core column windings are connected in series, and the low voltage branches are connected in parallel, so as to reduce the load loss of the system and the amount of copper in the winding. The insulation sleeve is used between the high and low voltage windings, and the vertical upward flow channel is opened in the internal insulation structure. The liquid working medium (16) in the box is vaporized by absorbing the heat generated in the transformer winding and the iron core, the gas bubbles flow upward through the vertical heat dissipation flow channel between the coils, and the gaseous working medium (17) enters the gas outlet pipe (3) and flows into the gas collecting chamber (4).

[0019] The above figure only illustrates some functional structure principles of the traction transformer evaporative cooling device of the motor train unit related to the utility model, and as the same technical personnel in the technical field can easily make some modifications on the basis, the specification does not want to limit the traction transformer evaporative cooling device of the motor train unit related to the utility model in the specific mechanism and application range shown or described, so that all the corresponding modifications and equivalents that can be utilized belong to the protection range of the utility model patent.

Claims

1. An evaporative cooling device for a multiple unit train traction transformer, characterized by, The traction transformer is arranged in the accommodating cavity and soaked in fluorocarbon working medium, the upper part of the accommodating cavity is connected with the air outlet pipe, the upper part of the air outlet pipe is connected with the gas collecting chamber, the gas collecting chamber is connected with the condensing chamber through the heat exchanger, a plurality of fans are arranged below the heat exchanger, the fans blow cooling air to cool the fluorocarbon working medium gas in the heat exchanger, the condensing chamber is connected with the liquid return pipe below, the liquid return pipe is connected with the bottom of the accommodating cavity, and a fluid flow loop is formed.

2. The EMU traction transformer evaporative cooling device according to claim 1, characterized in that, The traction transformer includes a box top and a side cover plate, and the cover plate is provided with a working medium self-circulation connecting pipe, and the high-voltage and low-voltage windings are led out from the right junction box.

3. The EMU traction transformer evaporative cooling device according to claim 2, characterized in that, The traction transformer includes a transformer coil and a core column, and the traction transformer is horizontally placed at the bottom of the carriage, the transformer coil is wound by pie-type winding, the high-voltage coil is arranged outside the core column, and the low-voltage coil is arranged inside the core column.

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