Gas-insulated switchgear body and gas-insulated switchgear

Abstract

The invention relates to the technical field of cooling of switching devices, in particular to a cubicle body of a gas-insulated switchgear and the gas-insulated switchgear. A containing space used for containing a primary main loop is formed in a closed cabinet body of the inflatable cabinet body, a configured heat exchange assembly comprises a heat exchange pipe, the two ends of the heat exchange pipe are connected with the opposite cabinet walls of the closed cabinet body in a sealed mode respectively and communicate with the exterior of the cabinet body, and then a heat exchange air duct is formed in the heat exchange pipe; the pipe wall of the heat exchange pipe is exposed in the containing space, and the heat exchange assembly further comprises a cooling fan which is arranged on the cabinet wall of the closed cabinet body and used for promoting flowing of air in the heat exchange air duct. According to the inflatable cabinet body, heat dissipated by the primary main loop can be transmitted to the heat exchange tubes through the insulating gas in the closed cabinet body, and when the heat dissipation fan operates, gas flows in the heat exchange air ducts formed in the heat exchange tubes to take away the heat on the heat exchange tubes, so that heat dissipation of the accommodating space is realized, the heat exchange path is shortened, and the heat dissipation efficiency is improved. The heat exchange efficiency is improved, and the temperature rise of the gas-insulated switchgear can be controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of cooling of switch devices, and in particular to an inflatable cabinet body and an inflatable cabinet. Background Art

[0002] When the box-type structure gas cabinet is used in 2500A, 3150A and 4000A high current systems, the main circuit in the gas box generates a lot of heat, the primary circuit and the insulating gas are sealed in the gas box, the thermal conductivity is poor, the heat exchange rate is low, and the heat of the conductive circuit cannot be effectively exchanged to the outside of the gas box, affecting the safe and stable operation of the product; and research has found that if dry air or environmentally friendly gases such as N2 are used as insulating media, the temperature rise is higher than SF6. Therefore, how to better achieve heat dissipation for high current gas cabinets has been a hot research direction in recent years.

[0003] The Chinese utility model patent with the authorization announcement number CN205070232U discloses a gas-insulated metal-enclosed switch cabinet and its heat dissipation device, which has heat dissipation fins arranged on the outside of the cabinet wall on one side of the switch cabinet, and at the same time, a heat dissipation channel extending up and down is formed by a U-shaped enclosure and the cabinet wall, a heat dissipation fan is arranged at the bottom of the heat dissipation channel, and the top of the heat dissipation channel is open, and the heat inside the cabinet is transferred to the heat dissipation fins through the cabinet wall, and then the heat on the heat dissipation fins is taken away by the gas flow in the heat dissipation channel, thereby realizing the heat dissipation of the switch cabinet. However, since the heat inside the cabinet of this switch cabinet cannot be taken away directly, it needs to go through a long heat dissipation path, resulting in low heat dissipation efficiency, and the purpose of rapid heat dissipation cannot be achieved, and the heat dissipation effect is still limited. Summary of the invention

[0004] The object of the present invention is to provide a gas-filled cabinet body to solve the problem of low heat dissipation efficiency of the existing gas-filled switch cabinet. At the same time, the object of the present invention is also to provide a gas-filled cabinet to solve the problem of low heat dissipation efficiency of the existing gas-filled switch cabinet.

[0005] The inflatable cabinet body of the present invention includes a closed cabinet body, which has a accommodating space for accommodating a primary main circuit. The closed cabinet body is equipped with a heat exchange component, which includes a heat exchange tube. The two ends of the heat exchange tube are respectively sealed and connected to the relative cabinet walls of the closed cabinet and communicate with the outside of the cabinet, thereby forming a heat exchange air duct in the heat exchange tube. The tube wall of the heat exchange tube is exposed in the accommodating space. The heat exchange component also includes a heat dissipation fan arranged on the cabinet wall of the closed cabinet body to promote the flow of gas in the heat exchange air duct.

[0006] The present invention provides an improved charging cabinet body, which is provided with a heat exchange tube in a accommodating space for accommodating a primary main circuit, and the tube wall of the heat exchange tube is exposed in the accommodating space, so that the heat dissipated by the primary main circuit can be transferred to the heat exchange tube through the insulating gas in the closed cabinet body. When the heat dissipation fan is running, the gas flows in the heat exchange air duct formed in the heat exchange tube, and then takes away the heat on the heat exchange tube, thereby realizing heat dissipation of the accommodating space. In this way, the heat exchange path is shortened, the heat exchange efficiency is improved, and it is helpful to control the temperature rise of the charging cabinet.

[0007] Furthermore, the heat exchange tube includes a rigid tube body and a flexible tube body sealed to at least one end of the rigid tube body. The flexible tube body can be deformed to balance the internal and external pressures when the air pressure in the closed cabinet changes, thereby avoiding a large change in the pressure at the sealed connection position and ensuring the sealing effect.

[0008] Furthermore, the flexible pipe body is a bellows, which is a common flexible pipe body, easy to obtain, and the deformation direction of the bellows is determined to be the axial direction, which makes it easier to ensure sealing with the cabinet wall.

[0009] Furthermore, the rigid pipe body and the corrugated pipe are both metal pipes, and the corrugated pipe is welded to the end of the rigid pipe body, so as to ensure a more reliable sealing connection and have a better pressure bearing capacity.

[0010] Furthermore, the outer wall of the rigid tube body is provided with a heat absorbing coating, which can accelerate the heat absorption of the rigid tube body and improve the heat dissipation efficiency.

[0011] Furthermore, the heat exchange tube extends up and down and the two ends are respectively sealed and connected to the top wall and the bottom wall of the closed cabinet. The up and down extension design is adopted to form a chimney effect, which is conducive to the flow of gas in the heat exchange air duct, and the hot air naturally flows upward, so that the hot air will no longer affect the temperature of the closed cabinet after being discharged from the upper end of the heat exchange tube.

[0012] Furthermore, the number of the heat exchange tubes and the heat dissipation fans is equal and arranged one by one. This can improve the gas flow efficiency of the heat exchange tubes and facilitate more flexible control to select part or all of the heat dissipation fans to operate, making it more convenient to use.

[0013] Furthermore, there are multiple heat exchange tubes, which are arranged side by side in the left-right direction near the rear side of the closed cabinet, so as to improve the heat exchange efficiency and ensure the heat exchange effect while making the best possible use of the space inside the closed cabinet.

[0014] Furthermore, the primary main circuit includes an inlet and outlet bushing and a switch assembly, the switch assembly and the inlet and outlet bushing are connected via a busbar, and at least part of the busbar is provided with a busbar heat sink. The busbar heat sink can dissipate the heat on the clamp busbar to the accommodation space, thereby helping the heat to be transferred to the heat exchange tube as quickly as possible through the insulating gas and taken away to achieve heat dissipation, and the heat dissipation effect is better.

[0015] Furthermore, an aluminum shell radiator is arranged on the top of the closed cabinet, so that the heat directly dissipated from the primary main circuit and rising to the top of the accommodation space can be dissipated, and better heat dissipation effect can be achieved in cooperation with the heat exchange component.

[0016] The inflatable cabinet of the present invention includes an inflatable cabinet body and a primary main circuit installed in the inflatable cabinet body. The inflatable cabinet body includes a closed cabinet body, and the closed cabinet body has a storage space for accommodating the primary main circuit. The closed cabinet body is equipped with a heat exchange component, and the heat exchange component includes a heat exchange pipe. The two ends of the heat exchange pipe are respectively sealed and connected to the relative cabinet walls of the closed cabinet and communicate with the outside of the cabinet, thereby forming a heat exchange air duct in the heat exchange pipe. The pipe wall of the heat exchange pipe is exposed in the storage space. The heat exchange component also includes a heat dissipation fan arranged on the cabinet wall of the closed cabinet body to promote the flow of gas in the heat exchange air duct.

[0017] The present invention provides an improved charging cabinet, in which a cabinet body is provided with a heat exchange tube in a storage space for accommodating a primary main circuit, and the tube wall of the heat exchange tube is exposed in the storage space, so that the heat dissipated by the primary main circuit can be transferred to the heat exchange tube through the insulating gas in the closed cabinet body. When the heat dissipation fan is running, the gas flows in the heat exchange air duct formed in the heat exchange tube, and then takes away the heat on the heat exchange tube, thereby realizing heat dissipation of the storage space. In this way, the heat exchange path is shortened, the heat exchange efficiency is improved, and it is helpful to control the temperature rise of the charging cabinet.

[0018] Furthermore, the heat exchange tube includes a rigid tube body and a flexible tube body sealed to at least one end of the rigid tube body. The flexible tube body can be deformed to balance the internal and external pressures when the air pressure in the closed cabinet changes, thereby avoiding a large change in the pressure at the sealed connection position and ensuring the sealing effect.

[0019] Furthermore, the flexible pipe body is a bellows, which is a common flexible pipe body, easy to obtain, and the deformation direction of the bellows is determined to be the axial direction, which makes it easier to ensure sealing with the cabinet wall.

[0020] Furthermore, the rigid pipe body and the corrugated pipe are both metal pipes, and the corrugated pipe is welded to the end of the rigid pipe body, so as to ensure a more reliable sealing connection and have a better pressure bearing capacity.

[0021] Furthermore, the outer wall of the rigid tube body is provided with a heat absorbing coating, which can accelerate the heat absorption of the rigid tube body and improve the heat dissipation efficiency.

[0022] Furthermore, the heat exchange tube extends up and down and the two ends are respectively sealed and connected to the top wall and the bottom wall of the closed cabinet. The up and down extension design is adopted to form a chimney effect, which is conducive to the flow of gas in the heat exchange air duct, and the hot air naturally flows upward, so that the hot air will no longer affect the temperature of the closed cabinet after being discharged from the upper end of the heat exchange tube.

[0023] Furthermore, the number of the heat exchange tubes and the heat dissipation fans is equal and arranged one by one. This can improve the gas flow efficiency of the heat exchange tubes and facilitate more flexible control to select part or all of the heat dissipation fans to operate, making it more convenient to use.

[0024] Furthermore, there are multiple heat exchange tubes, which are arranged side by side in the left-right direction near the rear side of the closed cabinet, so as to improve the heat exchange efficiency and ensure the heat exchange effect while making the best possible use of the space inside the closed cabinet.

[0025] Furthermore, the primary main circuit includes an inlet and outlet bushing and a switch assembly, the switch assembly and the inlet and outlet bushing are connected via a busbar, and at least part of the busbar is provided with a busbar heat sink. The busbar heat sink can dissipate the heat on the clamp busbar to the accommodation space, thereby helping the heat to be transferred to the heat exchange tube as quickly as possible through the insulating gas and taken away to achieve heat dissipation, and the heat dissipation effect is better.

[0026] Furthermore, an aluminum shell radiator is arranged on the top of the closed cabinet, so that the heat directly dissipated from the primary main circuit and rising to the top of the accommodation space can be dissipated, and better heat dissipation effect can be achieved in cooperation with the heat exchange component. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the first embodiment of the inflatable cabinet of the present invention;

[0028] Figure 2 It is a schematic diagram of a hidden rear cabinet wall of the first embodiment of the inflatable cabinet of the present invention;

[0029] Figure 3 It is a schematic diagram of the internal structure of the inflatable cabinet of the first embodiment of the present invention;

[0030] Figure 4 It is a schematic diagram of the structure of the heat exchange tube.

[0031] In the figure: 1. Closed cabinet; 21. Circuit breaker operating mechanism; 210. Circuit breaker; 22. Three-position switch operating mechanism; 220. Three-position switch; 23. Inlet and outlet bushings; 24. Busbar; 3. Rear sealing door; 4. Explosion-proof disk; 51. Rigid pipe body; 52. Flexible pipe body; 520. Connecting flange; 50. Cooling fan; 6. Busbar heat sink; 8. Aluminum shell radiator. DETAILED DESCRIPTION

[0032] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0033] Embodiments of the inflatable cabinet of the present invention:

[0034] The inflatable cabinet of the present invention mainly refers to a gas-insulated inflatable switch cabinet, especially for a switch cabinet with large current and high heating temperature, and proposes an improved solution that can efficiently dissipate heat and reduce temperature.

[0035] Specifically, the following combination Figure 1-4 The embodiment of the gas cabinet of the present invention is introduced. The gas cabinet includes a gas cabinet body and a primary main circuit installed in the gas cabinet body, the gas cabinet body includes a closed cabinet body 1, the inner cavity of the closed cabinet body 1 constitutes a storage space for accommodating the primary main circuit, the inlet and outlet bushings 23, the circuit breaker 210 and the three-position switch 220 included in the primary main circuit are arranged in the storage space, wherein the circuit breaker and the three-position switch constitute a switch assembly as a whole.

[0036] The closed cabinet 1 is a rectangular cabinet, including four side cabinet walls of front, rear, left and right, and a top cabinet wall and a bottom cabinet wall, wherein the circuit breaker operating mechanism 21 and the three-position switch operating mechanism 22 are fixedly installed on the front cabinet wall, and the circuit breaker operating mechanism 21 and the three-position switch operating mechanism 22 are both located outside the closed cabinet 1, and the circuit breaker 210 and the three-position switch 220 are fixedly installed inside the closed cabinet 1 corresponding to the circuit breaker operating mechanism 21 and the three-position switch operating mechanism 22. Inlet and outlet bushings 23 are also installed on the cabinet wall of the closed cabinet 1, specifically, the outlet bushings facing downward are installed on the bottom cabinet wall, and the inlet bushings are installed on the cabinet walls on the left and right sides, and the inlet bushings are electrically connected to the three-position switch 220 through the busbar 24, and the outlet bushings are electrically connected to the circuit breaker 210 through the busbar 24. The closed cabinet 1 is filled with insulating gas of a certain pressure, such as sulfur hexafluoride or nitrogen or dry air or a mixture of these insulating gases, to meet the insulation requirements inside the closed cabinet 1. A rear sealing door 3 is provided on the rear cabinet wall, and an explosion-proof disk 4 is installed on the rear sealing door 3.

[0037] Since the circuit breaker 210 and the three-position switch 220 are arranged in the front of the closed cabinet 1 as a whole, the heat generated by the busbar 24 connected thereto rises and gathers at the top position of the front side of the closed cabinet 1 after being dissipated into the closed cabinet 1. Therefore, in order to facilitate heat dissipation, an aluminum shell radiator 8 is arranged on the top cabinet wall of the closed cabinet 1 near the front side. At the same time, in order to dissipate heat more efficiently, a heat exchange component is also arranged in the accommodation space near the rear side of the closed cabinet 1 in this embodiment, and the arrangement of the heat exchange component is also a major innovation of the present invention.

[0038] Specifically, the heat exchange assembly mainly includes a heat exchange tube, the two ends of which are respectively sealed and connected to the opposite cabinet walls of the closed cabinet 1, and the two ends of the tube are connected to the outside of the closed cabinet 1, so that a heat exchange air duct for external air circulation is formed in the heat exchange tube. Such a design allows the heat exchange tube to be directly exposed in the accommodation space, and the heat generated by the primary main circuit is gathered in the accommodation space and can be directly transferred to the tube wall of the heat exchange tube through the insulating gas in the accommodation space, and then carried away by the flowing air in the heat exchange air duct, thereby realizing efficient heat exchange of the accommodation space in the closed cabinet 1.

[0039] In this embodiment, the heat exchange tube is arranged vertically, that is, the heat exchange tube extends up and down and the two ends are respectively sealed and connected to the top wall and the bottom wall of the closed cabinet 1. The up and down extension design is adopted to form a chimney effect, which is conducive to the natural formation of gas flow from bottom to top in the heat exchange air duct, and the hot air naturally flows upward, so that the hot air will no longer affect the temperature of the closed cabinet 1 after being discharged from the upper end of the heat exchange tube. Of course, such a setting in this embodiment does not limit other embodiments of the present invention. The heat exchange tube can be arranged in a horizontal extension manner. For example, the heat exchange tube extends left and right in the closed cabinet 1 and the two ends are respectively sealed and connected to the left and right cabinet walls of the closed cabinet 1, or the heat exchange tube extends front and back in the closed cabinet 1, and the two ends are respectively sealed and connected to the front and rear cabinets of the closed cabinet 1. It should be noted that in this case, the two ends of the heat exchange tube need to avoid the cabinet door and be connected to the fixed cabinet wall of the closed cabinet 1.

[0040] In order to accelerate the gas flow speed in the heat exchange air duct formed by the heat exchange tube and improve the heat exchange efficiency, the heat exchange assembly also includes a heat dissipation fan 50 arranged on the wall of the closed cabinet 1. The heat dissipation fan 50 is arranged corresponding to one of the ports of the heat exchange air duct, and accelerates the gas flow in the heat exchange air duct by blowing air inward at the air inlet of the heat exchange air duct or drawing air outward at the air outlet of the heat exchange air duct. In this embodiment, Figure 3 As shown, the heat dissipation fan 50 is arranged on the top cabinet wall of the closed cabinet 1, and draws air at the air outlet of the heat exchange air duct.

[0041] In this embodiment, in order to reasonably utilize the space in the closed cabinet 1, it is preferred to arrange a plurality of heat exchange tubes in a row in the left-right direction and arrange them near the rear side of the accommodation space. Based on this, in order to facilitate the setting of the heat dissipation fan 50 and the activation and deactivation of each heat exchange tube, the number of heat dissipation fans 50 is equal to the number of heat exchange tubes, and they are arranged one by one. Of course, if a plurality of heat exchange tubes are arranged in groups, and a plurality of heat exchange tubes in each group are evenly arranged on a circle or a regular polygonal contour around a vertical axis, then the number of heat dissipation fans 50 can be equal to the number of groups of heat exchange tubes, and each group corresponds to a heat dissipation fan 50, and the heat dissipation fan 50 is arranged corresponding to the air inlet or air outlet of the same group of heat exchange tubes, so as to blow or exhaust air to the same group of heat exchange tubes at the same time when starting. These are all deformation methods that can be made by those skilled in the art based on the concept of the present invention.

[0042] Specifically, the heat exchange tube in this embodiment includes a rigid tube body 51 and a flexible tube body 52 sealed at one or both ends of the rigid tube body 51. The flexible tube body 52 has the ability to deform. When the temperature in the closed cabinet 1 changes and the pressure changes, the internal pressure of the closed cabinet 1 is balanced by expansion and contraction. More specifically, the rigid tube body 51 is a long straight metal tube with a black plastic powder layer sprayed on its outer surface, so that the rigid tube body can absorb heat as quickly as possible. Of course, in other embodiments, it can be a black paint layer or other black spray layer or heat-absorbing layer. The flexible tube body 52 is a corrugated tube made of metal, such as Figure 4 As shown, the end of the bellows facing away from the long straight metal tube has a connecting flange 520, and a sealing ring is provided on the annular surface of the connecting flange 520. One end of the bellows is welded to the end of the long straight metal tube, and the other end is sealed and connected to the corresponding cabinet wall through the connecting flange 520, thereby ensuring reliable sealing. At the same time, during expansion and contraction, deformation only occurs more in the axial direction, thereby ensuring the sealing reliability between the bellows and the long straight metal tube and the corresponding cabinet wall, and ensuring the straightness of the heat exchange channel, ensuring that the airflow flows through the heat exchange duct with less flow resistance.

[0043] The use of metal bellows can facilitate heat exchange inside and outside the heat exchange tube, and is suitable for high temperature environments, has a long service life, and is highly reliable. However, this does not exclude that in other embodiments, the flexible tube body 52 can be made of a high temperature resistant rubber tube, and the two ends of the high temperature resistant rubber tube are welded or bonded to the corresponding structure.

[0044] In addition, in this embodiment, in order to accelerate the heat dissipation of the primary main circuit to the accommodation space, a busbar heat sink 6 is provided on the busbar 24 connecting the incoming bushing and the three-position switch 220 and / or the busbar 24 connecting the outgoing bushing and the circuit breaker 210. Through the provision of the busbar heat sink 6, the heat on the clamp busbar 24 can be dissipated to the accommodation space, which helps the heat to be transferred to the heat exchange tube as quickly as possible through the insulating gas and taken away to achieve heat dissipation, and the heat dissipation effect is better.

[0045] From the above introduction, it can be known that the inflatable cabinet of the present invention is equipped with a heat exchange tube in the storage space for accommodating the primary main circuit, and the tube wall of the heat exchange tube is exposed in the storage space, so that the heat emitted by the primary main circuit can be transferred to the heat exchange tube through the insulating gas in the closed cabinet 1. When the heat dissipation fan 50 is running, the gas flows in the heat exchange air duct formed in the heat exchange tube, and then takes away the heat on the heat exchange tube, thereby realizing the heat dissipation of the storage space. Compared with the prior art, such a heat exchange path is greatly shortened, which helps to control the temperature rise of the inflatable cabinet. At the same time, with the aluminum shell radiator 8 on the top, the heat dissipation effect can be better.

[0046] In other embodiments of the inflatable cabinet of the present invention, the difference from the first embodiment is that the heat exchange tube can be a straight long metal tube as a whole, and docking flanges are provided at both ends of the long straight metal tube to be sealed and connected with the corresponding cabinet wall. Of course, it can also be directly welded to the corresponding cabinet wall through the pipe mouth, and the flexible tube body 52 is no longer provided. Such a structure is simpler and has fewer connection positions to easily ensure sealing.

[0047] In other embodiments of the inflatable cabinet of the present invention, the difference from the first embodiment is that the heat exchange tube can be a zigzag bent tube, which can increase the heat exchange area with the insulating gas in the accommodating space and improve the heat exchange effect, but it is not easy to bend too many times to avoid excessive wind resistance.

[0048] In other embodiments of the inflatable cabinet of the present invention, the difference from the first embodiment is that the switch assembly can be only a circuit breaker or a three-position switch, and is not limited to a circuit breaker-three-position switch type integrated switch device composed of the two.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. An inflatable cabinet body, comprising a closed cabinet body (1), wherein the closed cabinet body (1) has a storage space for accommodating a primary main circuit, wherein: The closed cabinet (1) is provided with a heat exchange assembly, which includes a heat exchange tube, the two ends of which are respectively sealed and connected to the opposite cabinet wall of the closed cabinet (1) and communicate with the outside of the cabinet, thereby forming a heat exchange air duct in the heat exchange tube, and the tube wall of the heat exchange tube is exposed in the accommodating space. The heat exchange assembly also includes a heat dissipation fan (50) arranged on the cabinet wall of the closed cabinet (1) for promoting the flow of gas in the heat exchange air duct.

2. The inflatable cabinet body according to claim 1 is characterized in that: The heat exchange tube comprises a rigid tube body (51) and a flexible tube body (52) sealedly connected to at least one end of the rigid tube body (51).

3. The inflatable cabinet body according to claim 2 is characterized in that: The flexible pipe body (52) is a corrugated pipe.

4. The inflatable cabinet body according to claim 3 is characterized in that: The rigid tube body (51) and the corrugated tube are both metal tubes, and the corrugated tube is welded to the end of the rigid tube body (51).

5. The inflatable cabinet body according to claim 4 is characterized in that: The outer wall of the rigid tube body (51) is provided with a heat absorbing coating.

6. The inflatable cabinet body according to any one of claims 1 to 5, characterized in that: The heat exchange tube extends up and down and has two ends which are respectively sealed and connected to the top wall and the bottom wall of the closed cabinet (1).

7. The inflatable cabinet body according to any one of claims 1 to 5, characterized in that: The number of the heat exchange tubes and the heat dissipation fans (50) are equal and are arranged in a one-to-one correspondence.

8. The inflatable cabinet body according to claim 6, characterized in that: There are a plurality of heat exchange tubes, which are arranged in parallel in the left-right direction at a position close to the rear side of the closed cabinet (1).

9. The inflatable cabinet body according to any one of claims 1 to 5, characterized in that: The primary main circuit comprises an inlet and outlet bushing (23) and a switch assembly, wherein the switch assembly and the inlet and outlet bushing (23) are connected via a busbar (24), and at least part of the busbar (24) is provided with a busbar heat sink (6).

10. A gas filling cabinet, comprising a gas filling cabinet body and a primary main circuit installed in the gas filling cabinet body, characterized in that: The inflatable cabinet body is the inflatable cabinet body described in any one of claims 1-9.

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