CN205544884U - Change of current valve cooling system based on liquid metal - Google Patents

Abstract

The utility model provides a change of current valve cooling system based on liquid metal, including liquid metal radiator, first heat exchanger and the second heat exchanger that connects gradually, the liquid metal radiator is including setting up the liquid metal pipeline in its inside cavity, first heat exchanger is including setting up first pipeline and the second pipeline in its inside cavity, the second heat exchanger is including setting up the third pipeline in its inside cavity, liquid metal pipeline and first pipe connection form liquid metal's the bad return circuit of following, second pipeline and third pipe connection form deionized water circulation circuit. Compared with the prior art, the utility model provides a pair of change of current valve cooling system based on liquid metal because liquid metal has the extremely strong capacity of heat transmission, can take away the heat of change of current valve rapidly, and the outside heat exchanger of rethread can reduce the accumulation that the heat was located at the heat source in finally spreading the heat air to reduce the temperature of heat source department.

Description

Cooling system of diverter valve based on liquid metal

technical field

The utility model relates to the technical field of power semiconductor devices, in particular to a liquid metal-based converter valve cooling system.

Background technique

In recent years, the UHV DC transmission market at home and abroad has developed rapidly, and the market prospect is very broad. As the core equipment of the UHV DC transmission project, the converter valve is the core functional unit to realize AC-DC conversion, and the cooling effect of the cooling system in the valve body will directly affect the converter performance of the converter valve. Poor heat dissipation of the converter valve element will not only cause overheating and damage to the element, but also cause the DC system to shut down in severe cases. Therefore, the converter valve cooling system plays an important role in the direct current transmission system and requires very high reliability.

Due to its high specific heat, high thermal conductivity and high resistivity, deionized water is widely used as a coolant for converter valves in direct current transmission projects. Although the water cooling system has been widely used, its heat dissipation capacity is limited. The heat dissipation capacity of a typical water cooling system is 30W/cm2~50W/cm2. With the rise of the global energy Internet, the power transmitted by the power grid is increasing. The power density of the valve will also be greatly increased, and the resulting large heat flux density puts forward higher heat dissipation requirements for the cooling system. Therefore, how to reduce the temperature of power devices under certain structural conditions and improve the heat dissipation performance of the converter valve cooling system is particularly important for improving the reliability of power devices and converter valves. Therefore, it is necessary to develop a more efficient heat dissipation method.

Contents of the invention

In order to meet the needs of the prior art and develop a more efficient heat dissipation method, the utility model provides a liquid metal-based converter valve cooling system.

The technical scheme of the utility model is:

The system includes a liquid metal radiator, a first heat exchanger and a second heat exchanger connected in sequence;

The liquid metal radiator includes a liquid metal pipe arranged in its internal cavity;

The first heat exchanger includes a first pipe and a second pipe disposed in its internal cavity;

The second heat exchanger includes a third pipe disposed in its internal cavity;

The liquid metal pipeline is connected with the first pipeline to form a liquid metal circulation loop; the second pipeline is connected with the third pipeline to form a deionized water circulation loop.

preferred,

The outlet of the liquid metal pipeline is directly connected to the inlet of the first pipeline, and the high-temperature liquid metal output from the liquid metal pipeline is transmitted to the first pipeline;

The outlet of the first pipeline is connected to the inlet of the liquid metal pipeline through an electromagnetic pump, and the electromagnetic pump drives the low-temperature liquid metal output from the first pipeline to be transferred to the liquid metal pipeline;

The outlet of the second pipeline is connected to the inlet of the first pipeline through a water pump, and the water pump drives the low-temperature deionized water output from the second pipeline to be transported to the first pipeline, and the high-temperature liquid metal is separated from the low-temperature deionized water. heat exchange.

preferred,

The second heat exchanger is a cooling water tower;

The heat of the deionized water in the first pipeline is transferred to the air through the cooling water tower.

preferred,

The second heat exchanger is a metal block provided with cooling fins;

The heat of the deionized water in the first pipeline is transferred to the air through the cooling fins.

Preferably, the liquid metal is a gallium-based alloy whose melting point is not higher than 30°C.

Compared with the closest prior art, the excellent effect of the utility model is:

1. The utility model provides a converter valve cooling system based on liquid metal. Since liquid metal has a strong thermal conductivity, it can quickly take away the heat of the converter valve, and then transfer the heat to the final through the external heat exchanger. Diffusion into the air can reduce the accumulation of heat at the heat source, thereby reducing the temperature at the heat source;

2. The liquid metal-based converter valve cooling system provided by the utility model can effectively reduce the working temperature of power electronic devices and improve the reliability of the heat dissipation system compared with the water cooling system;

3. The utility model provides a converter valve cooling system based on liquid metal. Based on its high heat dissipation efficiency, the converter valve can work at a higher voltage and current level, so that the premise of not increasing the number of power electronic devices It can increase the working capacity of the power transmission device.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described.

Figure 1: A schematic structural diagram of a cooling system for a converter valve based on liquid metal in an embodiment of the utility model;

Among them, 1: liquid metal radiator; 2: first heat exchanger; 3: second heat exchanger; 4: electromagnetic pump; 5: low temperature liquid metal; 6: high temperature liquid metal; 7: high temperature deionized water ; 8: Low temperature deionized water; 9: Water pump.

detailed description

Embodiments of the invention are described in detail below, examples of which are shown in the drawings, wherein like reference numerals designate like elements or elements having the same function throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

An embodiment of a liquid metal-based converter valve cooling system provided by the utility model is shown in Figure 1, specifically:

The cooling system includes a liquid metal radiator 1 , a first heat exchanger 2 and a second heat exchanger 3 connected in sequence. in,

①: The liquid metal radiator 1 includes liquid metal pipes arranged in its internal cavity.

②: The first heat exchanger 2 includes a first pipe and a second pipe arranged in its internal cavity.

③: The second heat exchanger 3 includes a third pipe disposed in its internal cavity.

1. The liquid metal pipeline is connected with the first pipeline to form a circulating circuit of liquid metal

The outlet of the liquid metal pipeline is directly connected with the inlet of the first pipeline, and the high-temperature liquid metal 6 output by the liquid metal pipeline is transmitted to the first pipeline, and the outlet of the first pipeline is connected with the inlet of the liquid metal pipeline through an electromagnetic pump, driven by the electromagnetic pump 4 The low-temperature liquid metal 5 output by the first pipeline is transferred to the liquid metal pipeline; the outlet of the second pipeline is connected to the inlet of the first pipeline through a water pump 9, and the water pump drives the low-temperature deionized water 8 output by the second pipeline to be transmitted to the first pipeline. In this embodiment, the high-temperature liquid metal 6 refers to the liquid metal whose temperature rises after absorbing the heat emitted by the converter valve, and the low-temperature liquid metal 5 refers to the heat exchange between the above-mentioned high-temperature liquid metal and the low-temperature deionized water 8 A liquid metal that cools down.

①: By changing the magnetic field intensity or current value output by the electromagnetic pump 4, the transmission speed of the low-temperature liquid metal is adjusted. The electromagnetic pump provides a pair of vertically intersecting magnetic fields and currents to the liquid metal, so that the liquid metal in the pipeline is subjected to electromagnetic force along the direction of the pipeline, thereby pushing the liquid metal to flow in the pipeline, and adjusting the liquid metal by changing the strength of the magnetic field or the magnitude of the current The magnitude of the force, and then adjust the flow rate of the liquid metal, to achieve the purpose of adjusting the heat dissipation effect.

②: By changing the rotation speed of the water pump 9, the transmission speed of the low-temperature deionized water is adjusted, so as to achieve different cooling effects.

The liquid metal radiator 1 is used to absorb the heat generated by the diverter valve. The liquid metal exchanges heat with the deionized water in the first pipeline, so that the high-temperature liquid metal 6 is heat-exchanged into the low-temperature liquid metal 5 and flows back Liquid metal radiator. In this embodiment, the high-temperature deionized water 7 refers to the deionized water whose temperature rises after heat exchange with the high-temperature liquid metal 6, and the low-temperature deionized water 8 refers to the deionized water whose temperature decreases after the heat exchange with the second heat exchanger. Deionized water.

2. The second pipeline is connected to the third pipeline to form a deionized water circulation loop

The circulation loop is used to heat-exchange the high-temperature deionized water 7 into low-temperature deionized water 8 and return it to the first heat exchanger.

When the second heat exchanger adopts cooling water tower in the present embodiment:

The heat of the deionized water is transferred to the air through the cooling tower.

In this embodiment, when the second heat exchanger adopts a metal block provided with cooling fins:

The heat of the deionized water inside is transferred to the air through the cooling fins.

The working process of the converter valve cooling system based on liquid metal in the utility model is as follows:

The heat generated by the operation of the converter valve is transferred to the liquid metal radiator in contact with it. The liquid metal flows through its internal cavity to take away the heat. The temperature of the liquid metal rises and then enters the first heat exchanger. The liquid metal in the first heat exchanger exchanges heat with the deionized water at a lower temperature to lower the temperature, and then flows back to the liquid metal radiator for the next cycle of heat dissipation. At the same time, the temperature of the deionized water after the heat exchange with the liquid metal rises, it exchanges heat with the outside through the second heat exchanger, the temperature of the deionized water decreases, and then flows back to the first heat exchanger for the next cycle Heat dissipation, thereby realizing the heat exchange of the entire cooling system, and transferring the heat generated by the converter valve to the external environment.

Finally, it should be noted that the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

Claims (5)

1. A diverter valve cooling system based on liquid metal, characterized in that, said system includes a liquid metal radiator, a first heat exchanger and a second heat exchanger connected in sequence; The liquid metal radiator includes a liquid metal pipe arranged in its internal cavity; The first heat exchanger includes a first pipe and a second pipe disposed in its internal cavity; The second heat exchanger includes a third pipe disposed in its internal cavity; The liquid metal pipeline is connected with the first pipeline to form a liquid metal circulation loop; the second pipeline is connected with the third pipeline to form a deionized water circulation loop. 2. a kind of liquid metal-based diverter valve cooling system as claimed in claim 1, is characterized in that, The outlet of the liquid metal pipeline is directly connected to the inlet of the first pipeline, and the high-temperature liquid metal output from the liquid metal pipeline is transmitted to the first pipeline; The outlet of the first pipeline is connected to the inlet of the liquid metal pipeline through an electromagnetic pump, and the electromagnetic pump drives the low-temperature liquid metal output from the first pipeline to be transferred to the liquid metal pipeline; The outlet of the second pipeline is connected to the inlet of the first pipeline through a water pump, and the water pump drives the low-temperature deionized water output from the second pipeline to be transported to the first pipeline, and the high-temperature liquid metal is separated from the low-temperature deionized water. heat exchange. 3. a kind of liquid metal-based diverter valve cooling system as claimed in claim 1, is characterized in that, The second heat exchanger is a cooling water tower; The heat of the deionized water in the first pipeline is transferred to the air through the cooling water tower. 4. a kind of liquid metal-based diverter valve cooling system as claimed in claim 1, is characterized in that, The second heat exchanger is a metal block provided with cooling fins; The heat of the deionized water in the first pipeline is transferred to the air through the cooling fins. 5 . The liquid metal-based converter valve cooling system according to claim 1 , wherein the liquid metal is a gallium-based alloy whose melting point is not higher than 30° C. 6 .