A gas-insulated switchgear convenient for heat dissipation

Abstract

The invention discloses a gas-insulated switchgear convenient for heat dissipation, comprising a shell, wherein a busbar chamber, a circuit breaker chamber and a cable chamber which are isolated from each other are sequentially arranged inside the shell from top to bottom, wherein a static contact box is arranged inside the shell; a heat dissipation pipe is arranged inside the shell; one end of the heat dissipation pipe is located inside the circuit breaker chamber; the other end of the heat dissipation pipe is located above the top surface of the shell; the heat dissipation pipe is filled with cooling liquid; when the switchgear is in a closed operation state, the heat dissipation pipe absorbs the heat conducted from the overlapping pile head of the static contact box, and the cooling liquid inside the heat dissipation pipe conducts the heat to the top radiator for heat dissipation; the cooling liquid in the heat dissipation pipe vaporizes at high temperature and rises along the heat dissipation pipe to the top radiator for heat dissipation, and the high-temperature gaseous cooling liquid is liquefied into liquid cooling liquid at normal temperature after being cooled by the radiator, and the liquid cooling liquid at normal temperature flows back to the circuit breaker chamber along the inner wall of the heat dissipation pipe, thereby realizing circulating heat dissipation.

Description

Technical Field

[0001] The invention belongs to the technical field of switch cabinet equipment, and in particular relates to a gas-insulated switch cabinet that is easy to dissipate heat. Background Art

[0002] SF6 gas-insulated metal-enclosed switchgear has many incomparable advantages over traditional open switchgear, such as miniaturization, full insulation, full sealing, maintenance-free, strong environmental adaptability, high reliability, and long service life. It is favored by domestic and foreign power users and has become the most advanced and competitive equipment in the power transmission and distribution industry at home and abroad. The products are widely used in important power-using places with high power supply requirements and harsh environments, such as railways, rail transit systems, new energy industries, and high-altitude areas, and have huge market space.

[0003] The two-stage structure of the existing gas-insulated metal-enclosed switchgear increases the number of conductive parts and the number of overlapping surfaces between the interconnections, which consumes a lot of materials and is costly. In addition, the contact resistance of the overlapping surfaces will increase the heat generation of the equipment. The cabinet of the gas-insulated metal-enclosed switchgear is filled with a certain pressure of insulating gas (SF6, nitrogen, dry air or any combination of mixed gases) as a protective gas. When the heat in the cabinet accumulates to a certain extent, it will affect the stability and reliability of the electrical performance parameters of the switchgear installed in the cabinet, so the cabinet must have good heat dissipation performance.

[0004] The Chinese patent with publication number CN212751576U discloses a heat dissipation device for a gas-insulated switchgear and a gas-insulated switchgear, wherein the gas-insulated switchgear comprises a cabinet and an air box connected to the rear side of the cabinet, and the heat dissipation device comprises: a vertical air duct plate connected to the rear surface of the air box to cooperate with the rear surface of the air box to form an air inlet duct; a transverse air duct plate connected to the upper surface of the air box and its rear end connected to the upper end of the vertical air duct plate to cooperate with the upper surface of the air box to form a transverse air duct connected to the air inlet duct; a suction device, which is configured to communicate with the vertical air duct plate or the transverse air duct plate to form air convection flowing in from the air inlet duct and flowing out from the transverse air duct. The patent dissipates heat from the air box by designing the air duct structure to form air convection between the switchgear and the outside; however, this heat dissipation method is inefficient and has poor heat dissipation effect, and cannot directly perform deep cooling of the heat source part.

[0005] The Chinese patent with the publication number CN103001138A discloses a gas-insulated metal-enclosed switchgear that is easy to dissipate heat, comprising a circuit breaker box and a three-position switchgear box; the three-position switchgear box is arranged on the circuit breaker box; the circuit breaker box and the three-position switchgear box respectively comprise a first enclosed cabinet body and a second enclosed cabinet body; a cover plate is arranged on the outer side of one or more sides of the first enclosed cabinet body and the second enclosed cabinet body; a plurality of rib plates are arranged between the cover plate and the corresponding side; the first enclosed cabinet body and the second enclosed cabinet body are filled with insulating gas; the first enclosed cabinet body and the second enclosed cabinet body of the gas-insulated metal-enclosed switchgear that is easy to dissipate heat of the present invention are both made of thin plates, and at the same time, a cover plate is arranged on the outer side of one or more sides of the first and second enclosed cabinet bodies for heat dissipation, and the heat dissipation area is large, the heat dissipation effect is good, and it has sufficient strength and light weight. This patent only improves the heat dissipation effect by increasing the heat dissipation area of ​​the switchgear, and the heat dissipation capacity is limited, and the heat dissipation effect is general. Summary of the invention

[0006] The purpose of the present invention is to provide a gas-insulated switch cabinet which is convenient for heat dissipation in view of the problems existing in the prior art.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] A gas-insulated switchgear for heat dissipation comprises a shell, wherein a mutually isolated busbar chamber, a circuit breaker chamber and a cable chamber are sequentially arranged inside the shell from top to bottom, and a static contact box is arranged inside the circuit breaker chamber; a heat dissipation pipe is arranged inside the shell; one end of the heat dissipation pipe is located inside the circuit breaker chamber and connected to the static contact box; the other end of the heat dissipation pipe is located above the top surface of the shell and connected to a radiator; and a coolant is filled in the heat dissipation pipe;

[0009] When the switch cabinet is in the closed operation state, the heat dissipation pipe absorbs the heat conducted from the overlapping pile head of the static contact box, and the coolant inside the heat dissipation pipe conducts the heat to the top radiator for heat dissipation; the coolant in the heat dissipation pipe vaporizes at high temperature and rises along the heat dissipation pipe to the top radiator for heat dissipation, and the high-temperature gaseous coolant is cooled by the radiator and liquefied into liquid coolant at room temperature, and the liquid coolant at room temperature flows back to the circuit breaker chamber along the inner wall of the heat dissipation pipe, thereby realizing circulating heat dissipation.

[0010] Specifically, the circuit breaker chamber includes an upper chamber and a lower chamber that are separated; the incoming line terminal of the static contact box is located in the upper chamber, and the grounding terminal is located in the lower chamber; the incoming line terminal and the grounding terminal of the static contact box are respectively connected to the heat dissipation pipe; when the switch cabinet is in the open state, the heat dissipation pipe is grounded through the grounding terminal of the static contact box, thereby improving safety.

[0011] Furthermore, the heat dissipation pipe includes a vertically installed heat dissipation main pipe, a first heat dissipation branch pipe and a second heat dissipation branch pipe installed horizontally; the first heat dissipation branch pipe is located in the upper chamber, and one end of the first heat dissipation branch pipe is connected to the middle of the heat dissipation main pipe, and the other end is connected to the incoming line end of the static contact box; the second heat dissipation branch pipe is located in the lower chamber, and one end of the second heat dissipation branch pipe is connected to the bottom of the heat dissipation main pipe, and the other end is connected to the grounding end of the static contact box.

[0012] Furthermore, the outer peripheries of the first heat dissipation branch pipe and the second heat dissipation branch pipe are both provided with heat-absorbing insulating umbrella groups, which can absorb heat in the upper and lower chambers and conduct it to the top radiator through the coolant in the heat dissipation pipe, thereby improving the heat dissipation efficiency.

[0013] Preferably, a guide plate is provided at one end of the first heat dissipation branch pipe connected to the heat dissipation main pipe. By arranging the guide plate at the end of the first heat dissipation branch pipe, the normal temperature coolant flowing back from the upper end of the heat dissipation main pipe can be diverted, so that part of the coolant flows into the first heat dissipation branch pipe, and the other part of the coolant flows into the second heat dissipation branch pipe, so that the heat dissipation of the upper and lower chambers is more uniform and sufficient.

[0014] Optionally, the inner wall of the heat dissipation main pipe and the inner wall of the first heat dissipation branch pipe are both provided with a liquid absorbent core, and the liquid absorbent core of the inner wall of the heat dissipation main pipe and the liquid absorbent core of the inner wall of the first heat dissipation branch pipe are integrally formed; by providing the liquid absorbent core on the inner wall of the heat dissipation main pipe and the inner wall of the first heat dissipation branch pipe, the coolant can be absorbed by the liquid absorbent core, and the capillary action of the liquid absorbent core on the coolant can be utilized to transfer a part of the coolant refluxed in the heat dissipation main pipe to the first heat dissipation branch pipe, and the other part of the coolant flows into the second heat dissipation branch pipe under the action of its own gravity, so that the heat dissipation of the upper and lower chambers is more uniform and sufficient.

[0015] Specifically, the heat dissipation pipe is made of insulating material and has good safety.

[0016] Compared with the prior art, the present invention has the following advantages: (1) the present invention injects coolant into the heat dissipation pipe, utilizes the coolant to absorb heat and vaporize at the hot end (static contact box), and releases heat and liquefies at the cold end (radiator), thereby realizing cyclic heat dissipation, having a simple structure and high heat transfer efficiency; (2) the present invention utilizes an insulating umbrella group to increase the climbing design of the heat dissipation pipe surface, thereby improving the insulation performance of the heat dissipation pipe, increasing the heat dissipation area, and improving the heat dissipation efficiency inside the cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the internal structure of a gas-insulated switch cabinet that is convenient for heat dissipation according to the present invention;

[0018] Figure 2 Schematic diagram of the internal structure of the heat dissipation pipe in Example 1 of the present invention;

[0019] Figure 3Schematic diagram of the internal structure of the heat dissipation pipe in Embodiment 2 of the present invention;

[0020] In the figure: 1. Shell; 2. Busbar chamber; 3. Cable chamber; 4. Static contact box; 5. Radiator; 6. Upper chamber; 7. Lower chamber; 8. Inlet terminal; 9. Ground terminal; 10. Heat dissipation main pipe; 11. First heat dissipation branch pipe; 12. Second heat dissipation branch pipe; 13. Heat-absorbing insulating umbrella group; 14. Drainage plate; 15. Liquid absorption core; 16. Wall bushing; 17. Fixing plate. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example 1

[0023] like Figure 1 As shown, this embodiment provides a gas-insulated switchgear that is easy to dissipate heat, including a shell 1, wherein the shell 1 is provided with a busbar chamber 2, a circuit breaker chamber and a cable chamber 3 that are isolated from each other from top to bottom, and the circuit breaker chamber is provided with a static contact box 4; a heat dissipation pipe is provided inside the shell 1; one end of the heat dissipation pipe is located in the circuit breaker chamber and connected to the static contact box 4; the other end of the heat dissipation pipe is located above the top surface of the shell 1 and connected to the radiator 5; the heat dissipation pipe is filled with coolant (the coolant in this embodiment adopts industrial coolant, which can be vaporized at high temperature and liquefied at room temperature);

[0024] When the switch cabinet is in the closed operation state, the heat dissipation pipe absorbs the heat conducted from the overlapping pile head of the static contact box 4, and the coolant inside the heat dissipation pipe conducts the heat to the top radiator 5 for heat dissipation; the coolant in the heat dissipation pipe vaporizes at high temperature and rises along the heat dissipation pipe to the top radiator 5 for heat dissipation, and the high-temperature gaseous coolant is cooled by the radiator 5 and liquefied into liquid coolant at room temperature, and the liquid coolant at room temperature flows back to the circuit breaker chamber along the inner wall of the heat dissipation pipe, thereby realizing circulating heat dissipation.

[0025] Specifically, the circuit breaker chamber includes an upper chamber 6 and a lower chamber 7 that are separated; the incoming line terminal 8 of the static contact box 4 is located in the upper chamber 6, and the grounding terminal 9 is located in the lower chamber 7; the incoming line terminal 8 and the grounding terminal 9 of the static contact box 4 are respectively connected to the heat dissipation pipe; when the switch cabinet is in the open state, the heat dissipation pipe is grounded through the grounding terminal 9 of the static contact box 4, thereby improving safety; a wall bushing 16 is provided on the partition shared by the upper chamber 6 and the lower chamber 7 for the heat dissipation pipe to pass through, thereby realizing synchronous heat dissipation of the upper and lower chambers 7 and improving the heat dissipation effect.

[0026] Further, the heat dissipation pipe includes a vertically installed heat dissipation main pipe 10, a first heat dissipation branch pipe 11 and a second heat dissipation branch pipe 12 installed horizontally (in this embodiment, three first heat dissipation branch pipes 11 and two heat dissipation branch pipes 12 are provided, arranged in a horizontal direction perpendicular to the heat dissipation branch pipes, and the three heat dissipation branch pipes are connected to the three phases of the contact box according to three phases); the first heat dissipation branch pipe 11 is located in the upper chamber 6, and one end is connected to the middle of the heat dissipation main pipe 10, and the other end is connected to the inlet terminal 8 of the static contact box 4; the second heat dissipation branch pipe 12 is located in the lower chamber 7, and one end is connected to the bottom of the heat dissipation main pipe 10, and the other end is connected to the grounding terminal 9 of the static contact box 4; the first heat dissipation branch pipe 11 and the second heat dissipation branch pipe 12 are respectively connected to the inlet terminal 8 and the grounding terminal 9 of the static contact box 4 through fixing flanges, and the fixing flanges are made of insulating heat conductive materials. An aluminum fixing plate 17 is provided on the top of the heat dissipation main pipe 10, which is used to fix the heat dissipation main pipe 10 inside the housing 1.

[0027] Furthermore, a heat-absorbing insulating umbrella group 13 is provided on the outer periphery of the first heat dissipation branch pipe 11 and the second heat dissipation branch pipe 12. The heat-absorbing insulating umbrella group 13 can absorb the heat in the upper and lower chambers 7, and conduct the heat to the top radiator 5 through the coolant in the heat dissipation pipe, thereby improving the heat dissipation efficiency; at the same time, the heat-absorbing insulating umbrella group 13 can provide an effective and safe creepage distance for the heat dissipation pipe, thereby improving the safety of the device; the creepage distance of the heat-absorbing insulating umbrella group 13 on the first heat dissipation branch pipe 11 is greater than 1000mm, and the creepage distance of the heat-absorbing insulating umbrella group 13 on the second heat dissipation branch pipe 12 is greater than 1800mm.

[0028] Preferably, if Figure 2 As shown, a guide plate 14 is provided at one end of the first heat dissipation branch pipe 11 connected to the heat dissipation main pipe 10. By providing the guide plate 14 at the end of the first heat dissipation branch pipe 11, the normal temperature coolant flowing back from the upper end of the heat dissipation main pipe 10 can be diverted, so that a part of the coolant flows into the first heat dissipation branch pipe 11, and the other part of the coolant flows into the second heat dissipation branch pipe 12, so that the heat dissipation of the upper and lower chambers 7 is more uniform and sufficient.

[0029] The heat dissipation working principle of the switch cabinet in this embodiment is as follows:

[0030] When the circuit breaker is in the closed state, the normal temperature coolant in the first heat dissipation branch pipe 11 and the second heat dissipation branch pipe 12 absorbs the heat from the inlet terminal 8 and the ground terminal 9 of the static contact box 4 and then vaporizes to form a high temperature gaseous working medium. The high temperature gaseous working medium in the first heat dissipation branch pipe 11 and the second heat dissipation branch pipe 12 diffuses along their respective pipes and merges in the heat dissipation main pipe 10, and diffuses to the top of the heat dissipation main pipe 10 together, condenses at the cold end (radiator 5), and forms a normal temperature liquid working medium. The radiator 5 at the top of the heat dissipation main pipe 10 liquefies the high temperature gaseous working medium to generate a large amount of A large amount of heat is dissipated into the atmosphere, thereby achieving a cooling effect on the static contact box 4; the room-temperature liquid working medium at the top of the heat dissipation main pipe 10 is affected by its own gravity and flows downward along the heat dissipation main pipe 10. When it reaches the connecting port between the first heat dissipation branch pipe 11 and the heat dissipation main pipe 10, a part of the coolant continues to flow downward along the inner wall of the heat dissipation main pipe 10 under the influence of its own gravity, and finally flows back to the second heat dissipation branch pipe 12; the other part flows back to the inside of the first heat dissipation branch pipe 11 along the guide plate 14; thereby achieving the circulation and heat dissipation of the coolant in the heat dissipation pipe.

[0031] Example 2

[0032] like Figure 3 As shown, this embodiment provides a gas-insulated switchgear that is easy to dissipate heat. The difference from the above embodiment is that the inner wall of the heat dissipation main pipe 10 and the inner wall of the first heat dissipation branch pipe 11 are both provided with a liquid wick 15 (in this embodiment, the material of the liquid wick 15 is mainly composed of porous materials such as metal mesh, foam material, felt, fiber, etc.), and the liquid wick 15 on the inner wall of the heat dissipation main pipe 10 and the liquid wick 15 on the inner wall of the first heat dissipation branch pipe 11 are integrally formed; by providing the liquid wick 15 on the inner wall of the heat dissipation main pipe 10 and the inner wall of the first heat dissipation branch pipe 11, the coolant can be absorbed by the liquid wick 15, and by utilizing the capillary action of the liquid wick 15 on the coolant, a part of the coolant refluxed in the heat dissipation main pipe 10 is transferred to the first heat dissipation branch pipe 11, and the other part of the coolant flows into the second heat dissipation branch pipe 12 under the action of its own gravity, so that the heat dissipation of the upper and lower chambers 7 is more uniform and sufficient.

[0033] The heat dissipation working principle of the switch cabinet in this embodiment is as follows:

[0034] When the circuit breaker is in the closed state, the normal temperature coolant in the first heat dissipation branch pipe 11 absorbs the heat of the inlet terminal 8 of the static contact box 4 and then vaporizes to form a high temperature gaseous working medium, and diffuses along the first heat dissipation branch pipe 11 and the heat dissipation main pipe 10 to the cold end (radiator 5) and condenses into a normal temperature liquid working medium; at the same time, the normal temperature coolant in the second branch pipe absorbs the heat of the grounding terminal 9 of the static contact box 4 and then vaporizes to form a high temperature gaseous working medium, and diffuses along the second heat dissipation branch pipe 12 and the heat dissipation main pipe 10 to the cold end (radiator 5) and condenses into a normal temperature liquid working medium; the radiator 5 at the top of the heat dissipation main pipe 10 dissipates a large amount of heat generated by the liquefaction of the high temperature gaseous working medium into the atmosphere, thereby achieving a cooling effect on the static contact box 4; the room-temperature liquid working medium at the top of the heat dissipation main pipe 10 flows downward along the heat dissipation main pipe 10 under the influence of its own gravity and the capillary action of the liquid absorption core 15 of the tube wall, and when it reaches the connecting port between the first heat dissipation branch pipe 11 and the heat dissipation main pipe 10, a part of the coolant continues to flow downward along the inner wall of the heat dissipation main pipe 10 under the influence of its own gravity, and finally flows back to the second heat dissipation branch pipe 12; the other part flows back to the inside of the first heat dissipation branch pipe 11 along the inner wall of the first heat dissipation branch pipe 11 under the capillary action of the liquid absorption core 15; thereby achieving the circulation heat dissipation of the coolant in the heat dissipation pipe.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A gas-insulated switchgear for heat dissipation, comprising a housing, wherein a busbar chamber, a circuit breaker chamber and a cable chamber are provided in the housing from top to bottom, and a static contact box is provided in the circuit breaker chamber; characterized in that: A heat dissipation pipe is provided inside the shell; one end of the heat dissipation pipe is located in the circuit breaker chamber and is connected to the static contact box; the other end of the heat dissipation pipe is located above the top surface of the shell and is connected to the radiator; the heat dissipation pipe is filled with coolant, and the heat dissipation pipe includes a vertically installed heat dissipation main pipe, a first heat dissipation branch pipe and a second heat dissipation branch pipe installed horizontally; one end of the first heat dissipation branch pipe is connected to the middle of the heat dissipation main pipe, and the other end is connected to the incoming line end of the static contact box; one end of the second heat dissipation branch pipe is connected to the bottom of the heat dissipation main pipe, and the other end is connected to the grounding end of the static contact box; when the switch cabinet is in the open state, the heat dissipation pipe is grounded through the grounding end of the static contact box; the outer peripheries of the first heat dissipation branch pipe and the second heat dissipation branch pipe are both provided with A heat-absorbing insulating umbrella group is provided, and the circuit breaker chamber includes an upper chamber and a lower chamber that are separated; the incoming line end of the static contact box is located in the upper chamber, and the grounding end is located in the lower chamber; the incoming line end and the grounding end of the static contact box are respectively connected to the heat dissipation pipe, and the first heat dissipation branch pipe is located in the upper chamber; the second heat dissipation branch pipe is located in the lower chamber, and one end is connected to the bottom of the heat dissipation main pipe, and the other end is connected to the grounding end of the static contact box; a guide plate is provided at one end of the first heat dissipation branch pipe connected to the heat dissipation main pipe, or the inner wall of the heat dissipation main pipe and the inner wall of the first heat dissipation branch pipe are both provided with a liquid absorption core, and the liquid absorption core of the inner wall of the heat dissipation main pipe and the liquid absorption core of the inner wall of the first heat dissipation branch pipe are integrally formed, and the heat dissipation pipe is made of insulating material.

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