Three-position switch, gas box and inflatable cabinet

Abstract

The utility model relates to the technical field of medium-voltage complete equipment, and in particular to a three-position switch, a gas box and an inflatable cabinet. The three-position switch includes a static contact, a moving contact and a closing contact, one end of the moving contact is connected to the static contact, and the other end of the moving contact is connected to the closing contact. The side wall of the static contact is provided with a first through hole, the first through hole is located at the connection between the static contact and the moving contact, and the first through hole is connected to the inside of the static contact; the first through hole is configured to dissipate the heat inside the static contact and / or the inside of the moving contact. By providing the first through hole on the side wall of the static contact, the first through hole is connected to the inside of the static contact, and the first through hole is at the connection between the static contact and the moving contact, so that during the operation of the three-position switch, the heat in the static contact and the moving contact can be discharged in time by the first through hole under the action of the airflow, thereby improving the heat transfer efficiency, improving the heat dissipation effect of the three-position switch, improving safety, and saving costs.

Description

Technical Field

[0001] The utility model relates to the technical field of medium-voltage complete sets of equipment, in particular to a three-position switch, a gas box and an inflatable cabinet. Background Art

[0002] The gas-filled cabinet, also known as DXG-12(C) indoor AC high-voltage gas-insulated metal-enclosed switchgear, is a new generation of switchgear. Its main switch can use either a permanent magnetic mechanism vacuum circuit breaker or a spring mechanism vacuum circuit breaker. The entire cabinet uses a combination of air insulation and sulfur hexafluoride gas compartments, which is both compact and expandable, and is suitable for power distribution automation.

[0003] Temperature and insulation are the two most important indicators of the health status of the inflatable cabinet. At the same time, these two factors influence each other. As long as the temperature rise can be effectively controlled, many electrical accidents can be effectively avoided, thereby improving the safety performance of the inflatable cabinet.

[0004] When the inflatable cabinet in the prior art is in operation, the conductive parts inside it (such as three-position switches and four-position switches) will generate a lot of heat. In order to ensure the stable and healthy operation of the inflatable cabinet and reduce the frequency of electrical accidents, some people in the industry currently install a large radiator backpack on the air box of the inflatable cabinet to promote heat exchange inside and outside the inflatable cabinet by increasing the heat dissipation area of ​​the air box, or install a fan on the cabinet to achieve the effect of rapid heat dissipation.

[0005] However, affected by the air box structure of the inflatable cabinet, the main heat inside the air box will be too concentrated at the connection position of the conductive part, and the installation method and position of the radiator backpack in the prior art cannot effectively promote heat diffusion; in addition, the installation method of the external fan on the cabinet body cannot dissipate the heat at the connection position of the conductive part in time, and the heat dissipation effect is limited; at the same time, the fan is affected by its own quality and service life, and cannot guarantee a stable heat dissipation effect, has poor reliability, and increases costs.

[0006] Therefore, it is urgent to design a three-position switch, a gas box and an inflatable cabinet to solve the above technical problems. Utility Model Content

[0007] The first purpose of the utility model is to provide a three-position switch, which can improve the heat transfer efficiency of the conductive part, improve the heat dissipation effect of the air box, and save costs.

[0008] To achieve this purpose, the utility model adopts the following technical solutions:

[0009] The utility model provides a three-position switch, comprising a static contact, a moving contact and a closing contact, wherein one end of the moving contact is connected to the static contact, and the other end of the moving contact is connected to the closing contact, and a first through hole is provided on the side wall of the static contact, wherein the first through hole is located at the connection between the static contact and the moving contact, and the first through hole is configured to dissipate heat inside the static contact and / or inside the moving contact.

[0010] As an optional technical solution for a three-position switch, the outer side walls at both ends of the moving contact are respectively provided with grooves, each of the grooves is respectively provided with a spring contact finger, and at least one of the spring contact fingers is respectively in contact with the moving contact or the static contact; the groove is provided with a third through hole, and the third through hole is connected to the interior of the moving contact.

[0011] As an optional technical solution for a three-position switch, a first connecting portion is provided on the static contact, the first connecting portion is used to connect to an insulator, a second through hole is provided on the side wall of the first connecting portion, and the second through hole is connected to the interior of the static contact.

[0012] As an optional technical solution for a three-position switch, the moving contact has a second connecting part, a third connecting part and a fourth connecting part, the two ends of the third connecting part are respectively connected to the second connecting part and the fourth connecting part, at least one groove is respectively arranged on the second connecting part and the fourth connecting part, the groove is arranged corresponding to the spring contact finger, the diameter of the third connecting part is smaller than the diameter of the second connecting part, and the diameter of the third connecting part is smaller than the diameter of the fourth connecting part.

[0013] As an optional technical solution for a three-position switch, a fourth through hole is provided on the third connecting portion, and the fourth through hole is connected to the interior of the moving contact.

[0014] As an optional technical solution for a three-position switch, a fifth through hole is provided on the side wall of the closing contact, and the fifth through hole is connected to the interior of the closing contact. Along the radial direction of the moving contact, the fifth through hole is arranged corresponding to at least one spring contact finger, and the first through hole is arranged corresponding to at least one spring contact finger.

[0015] The second purpose of the utility model is to provide an air box, which has low cost, high safety, can improve heat transfer efficiency, and has good heat dissipation performance.

[0016] To achieve this purpose, the utility model adopts the following technical solutions:

[0017] The utility model provides a gas box, which comprises a shell, a circuit breaker, a first busbar, an insulator and the three-position switch described above, wherein the circuit breaker, the first busbar, the insulator and the three-position switch are all arranged in the shell, and the first busbar is connected to the circuit breaker, one end of the insulator is connected to the first busbar, and the other end is connected to the static contact of the three-position switch.

[0018] As an optional technical solution of an air box, the air box further comprises a third busbar and a busbar bushing, one end of the third busbar is connected to the closing contact, and the other end is connected to the busbar bushing;

[0019] The busbar bushing comprises a second mounting portion and a second conductive portion, the second conductive portion is connected to the third busbar, and the second mounting portion is connected to the second conductive portion;

[0020] The second conductive portion is a planar structure or a stepped structure;

[0021] and / or,

[0022] The gas box further comprises a second busbar and an outlet bushing, wherein one end of the second busbar is connected to the circuit breaker, and the other end is connected to the outlet bushing;

[0023] The outlet bushing comprises a first mounting portion and a first conductive portion, an end of the first conductive portion is connected to the second busbar, and the first mounting portion is connected to the first conductive portion;

[0024] The first conductive portion is a planar structure or a stepped structure.

[0025] As an optional technical solution for the gas box, the circuit breaker includes a first lap joint and a second lap joint, the first lap joint is connected to the first busbar, a sixth through hole is provided on the second lap joint, and an inspection hole is also provided on the circuit breaker, and the sixth through hole and the inspection hole are both connected to the interior of the circuit breaker.

[0026] The third purpose of the utility model is to provide an inflatable cabinet, which has good heat dissipation performance and safety performance and can also achieve the purpose of cost saving.

[0027] To achieve this purpose, the utility model adopts the following technical solutions:

[0028] The utility model provides an inflatable cabinet, which comprises a cabinet body, a heat dissipation device, a sealing device and the above-mentioned air box, wherein the sealing device is arranged on the air box and is used for sealing the air box, the heat dissipation device is arranged on the side wall of the cabinet body, and the air box is arranged on the upper part of the cabinet body.

[0029] The beneficial effects of the utility model include at least:

[0030] The utility model provides a three-position switch, which includes a static contact, a moving contact and a closing contact, one end of the moving contact is connected to the static contact, the other end of the moving contact is connected to the closing contact, a first through hole is provided on the side wall of the static contact, the first through hole is located at the connection between the static contact and the moving contact, and the first through hole is connected to the inside of the static contact; the first through hole is configured to dissipate the heat inside the static contact and / or the inside of the moving contact. The three-position switch of the utility model starts from the structure of the heat source itself, and improves the heat transfer efficiency and the heat dissipation effect by optimizing the structure of the static contact. That is, by setting a first through hole on the side wall of the static contact, the first through hole is connected to the inside of the static contact, and the first through hole is at the connection between the static contact and the moving contact. In this way, during the operation of the three-position switch, the heat in the static contact and the moving contact can be discharged in time through the first through hole under the action of the airflow, thereby improving the heat transfer efficiency and the heat dissipation effect of the air box, and thus eliminating the need to use the radiator backpack and fan in the prior art for heat dissipation, thereby improving safety and reliability and saving costs.

[0031] The utility model also provides an air box, which has low cost, high safety, can improve heat transfer efficiency, and has good heat dissipation performance.

[0032] The utility model also provides an inflatable cabinet, which has good heat dissipation performance and safety performance and can also achieve the purpose of cost saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0034] Figure 1 A schematic diagram of the structure of an air box (housing not shown) provided in an embodiment of the utility model;

[0035] Figure 2 An exploded view of a three-position switch provided by an embodiment of the utility model;

[0036] Figure 3 The main view of the three-position switch provided by the embodiment of the utility model Figure 1 ;

[0037] Figure 4 The main view of the three-position switch provided by the embodiment of the utility model Figure 2 ;

[0038] Figure 5 The main view of the three-position switch provided by the embodiment of the utility model Figure 3 ;

[0039] Figure 6 A schematic diagram of the structure of a circuit breaker provided by an embodiment of the utility model;

[0040] Figure 7 A schematic diagram of the structure of a part of the circuit breaker provided in the embodiment of the utility model Figure 1 ;

[0041] Figure 8 A schematic diagram of the structure of a part of the circuit breaker provided in the embodiment of the utility model Figure 2 ;

[0042] Fig. 9 A cross-sectional view of a portion of a circuit breaker provided by an embodiment of the utility model;

[0043] Fig.10 The structure of the outlet bushing provided by the embodiment of the utility model is shown as follows Figure 1 ;

[0044] Fig.11 The structure of the outlet bushing provided by the embodiment of the utility model is shown as follows Figure 2 ;

[0045] Fig.12 The structure of the busbar bushing provided by the embodiment of the utility model is schematically shown in FIG. Figure 1 ;

[0046] Fig.13 The structure of the busbar bushing provided by the embodiment of the utility model is schematically shown in FIG. Figure 2 ;

[0047] Fig.14 A cross-sectional view of an air box provided by an embodiment of the utility model;

[0048] Fig.15 This is a schematic structural diagram of an inflatable cabinet provided in an embodiment of the utility model.

[0049] Reference numerals

[0050] 10. Three-position switch;

[0051] 100, static contact; 110, first through hole; 120, first connecting portion; 130, second through hole;

[0052] 200, moving contact; 210, groove; 220, spring contact finger; 230, third through hole; 240, second connecting portion; 250, third connecting portion; 260, fourth connecting portion; 270, fourth through hole;

[0053] 300, closing contact; 310, fifth through hole;

[0054] 400, gas box;

[0055] 410, housing;

[0056] 420, circuit breaker; 4201, vacuum interrupter; 4202, moving end contact seat; 4203, elastic connector; 4204, conductive clip; 4205, first lap joint surface; 4206, second lap joint surface; 4207, sixth through hole; 4208, inspection hole; 4209, static end contact seat;

[0057] 430, first busbar; 440, insulator; 450, second busbar; 460, outlet bushing; 4601, first mounting portion; 4602, first conductive portion; 470, third busbar; 480, busbar bushing; 4801, second mounting portion; 4802, second conductive portion;

[0058] 500. Cabinet; 600. Heat dissipation device; 700. Sealing device. DETAILED DESCRIPTION

[0059] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clearly, the technical solutions of the present invention are further explained below with reference to the accompanying drawings and through specific implementation methods.

[0060] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0062] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0063] In the description of this embodiment, unless otherwise specified, the term "plurality" refers to a quantity of two or more than two.

[0064] In order to overcome the problem of temperature rise and heat dissipation difficulties in gas-filled cabinets (such as high-current gas-insulated cabinets), this embodiment provides a three-position switch. Starting from the heat source itself, by optimizing the structure of the three-position switch, the resistance of the conductive part loop is reduced, the conductive part flow rate and the gas heat transfer rate are increased, thereby reducing the heat generated by the conductive part, improving the heat transfer efficiency of the conductive part, and improving the heat dissipation effect of the gas box, thereby achieving the purpose of cost saving. It can be understood that the conductive part mentioned above can be the three-position switch in this embodiment, or it can be other conductive components in the gas-filled cabinet.

[0065] like Figure 1-Figure 5 As shown, the three-position switch 10 mainly includes a static contact 100, a moving contact 200 and a closing contact 300. One end of the moving contact 200 is connected to the static contact 100, and the other end of the moving contact 200 is connected to the closing contact 300. The side wall of the static contact 100 is provided with a first through hole 110. The first through hole 110 is located at the connection between the static contact 100 and the moving contact 200, and the first through hole 110 is connected to the interior of the static contact 100; the first through hole 110 is configured to dissipate heat inside the static contact 100 and / or the moving contact 200.

[0066] Based on the above design, in this embodiment, through the setting of the first through hole 110, when the circuit of the three-position switch 10 is in the on state, the heat in the static contact 100 and the moving contact 200 can be quickly dissipated from the first through hole 110 to the outside of the three-position switch 10 under the flow of airflow, thereby accelerating the flow of airflow inside the static contact 100 and the moving contact 200, promoting heat exchange convection, thereby improving heat transfer efficiency, improving the heat dissipation effect of the air box 400, improving safety, and saving costs.

[0067] Optionally, a plurality of first through holes 110 in the present embodiment may be provided, and the plurality of first through holes 110 are evenly arranged, thereby improving the heat dissipation effect of the three-position switch 10 and improving safety.

[0068] Compared with the prior art, the three-position switch 10 in this embodiment starts from the structure of the heat source itself, and improves the heat transfer efficiency and the heat dissipation effect by optimizing the structure of the static contact 100. In other words, by setting the first through hole 110 on the side wall of the static contact 100, the first through hole 110 is connected with the inside of the static contact 100, and the first through hole 110 is at the connection between the static contact 100 and the moving contact 200. In this way, during the operation of the three-position switch 10, the heat in the static contact 100 and the moving contact 200 can be discharged in time through the first through hole 110 under the action of the airflow, thereby improving the heat transfer efficiency and improving the heat dissipation effect of the air box 400. There is no need to use the radiator backpack and fan in the prior art, which improves safety and reliability and saves costs.

[0069] It can be understood that the connection between the stationary contact 100 and the moving contact 200 in this embodiment is located at both ends of the stationary contact 100 . In other words, the first through hole 110 in this embodiment is located at both ends of the stationary contact 100 .

[0070] like Figure 1-Figure 5 As shown, the static contact 100 in this embodiment is provided with a first connection portion 120, the first connection portion 120 is used to connect the insulator 440, and the side wall of the first connection portion 120 is provided with a second through hole 130, and the second through hole 130 is communicated with the interior of the static contact 100. Optionally, the first connection portion 120 in this embodiment is arranged below the static contact 100, and it can be understood that the first through hole 110 and the second through hole 130 are both communicated with the interior of the static contact 100, and the arrangement of the second through hole 130 allows the airflow at the bottom of the static contact 100 to pass through the second through hole 130 and enter the interior of the static contact 100, and then the heat inside the static contact 100 and the end of the moving contact 200 is taken away by the first through hole 110, thereby accelerating the flow of airflow, promoting heat exchange convection, and improving the heat dissipation capacity.

[0071] Optionally, this embodiment does not specifically limit the layout and number of the second through holes 130 .

[0072] like Figure 3-Figure 5 As shown, in this embodiment, the outer peripheral side walls at both ends of the movable contact 200 are provided with grooves 210, and the three-position switch 10 further includes two spring contact fingers 220, each of which is arranged in one groove 210, and at least one spring contact finger 220 is respectively in contact with the movable contact 200 or the stationary contact 100; the groove 210 is provided with a third through hole 230, and the third through hole 230 is connected with the inside of the movable contact 200. Optionally, the third through hole 230 can be arranged at the bottom of the groove 210 or on the side wall of the groove 210.

[0073] Specifically, when the three-position switch 10 is opened, all the spring contact fingers 220 at both ends of the static contact 100 are simultaneously connected to the moving contact 200 and the static contact 100. When the three-position switch 10 is closed, the spring contact finger 220 at one end of the moving contact 200 is connected to the closing contact 300, and the spring contact finger 220 at the other end of the moving contact 200 is connected to the static contact 100.

[0074] Optionally, the operator can set different numbers of spring contact fingers 220 according to actual needs. For example, four spring contact fingers 220 can be set, where two spring contact fingers 220 are located at one end of the moving contact 200, and the other two spring contact fingers 220 are located at the other end of the moving contact 200, and the spring contact fingers 220 are set in a one-to-one correspondence with the grooves 210.

[0075] The arrangement of the spring contact finger 220 can ensure good electrical connection between the moving contact 200, the closing contact 300 and the stationary contact 100, so that the current can flow smoothly. In addition, the spring contact finger 220 reduces and absorbs vibration, which is conducive to improving the reliability and stability of the connection between the moving contact 200, the closing contact 300 and the stationary contact 100. At the same time, the spring contact finger 220 has high sensitivity and fast response capability, which can ensure the stable operation of the three-position switch 10 under the condition that the circuit is frequently connected and disconnected.

[0076] The provision of the groove 210 can improve the stability of the installation of the spring contact finger 220, avoiding the risk of displacement or even slipping. The provision of the third through hole 230 can promote the heat flow at the spring contact finger 220, so that the heat inside the moving contact 200 can flow out to the outside through the third through hole 230, thereby improving the heat dissipation effect.

[0077] Optionally, this embodiment does not specifically limit the layout and number of the third through holes 230 .

[0078] Furthermore, if Figure 3-Figure 5 As shown, the movable contact 200 in this embodiment has a second connection part 240, a third connection part 250 and a fourth connection part 260, and the two ends of the third connection part 250 are respectively connected to the second connection part 240 and the fourth connection part 260. Optionally, the second connection part 240, the third connection part 250 and the fourth connection part 260 are integrally formed to improve processing efficiency. Two grooves 210 are respectively provided at the second connection part 240 and the fourth connection part 260, that is, two spring contact fingers 220 are located at the two ends of the movable contact 200, so as to facilitate the connection of the movable contact 200 with the closing contact 300 and the static contact 100.

[0079] Furthermore, in this embodiment, the diameter of the third connection part 250 is smaller than the diameter of the second connection part 240, and the diameter of the third connection part 250 is smaller than the diameter of the fourth connection part 260. This can reduce the sliding resistance between the moving contact 200 and the static contact 100, while also increasing the heat dissipation space and improving the heat dissipation performance.

[0080] Specifically, the diameter of the second connection portion 240 is equal to the diameter of the fourth connection portion 260, and the diameter of the third connection portion 250 is smaller than the diameter of the second connection portion 240. In other words, the movable contact 200 in this embodiment is a waist-shaped structure, which can increase the matching clearance when the movable contact 200 enters the stationary contact 100, reduce the sliding resistance between the movable contact 200 and the stationary contact 100, and also increase the heat dissipation space and improve the heat dissipation performance.

[0081] like Figure 3-Figure 5 As shown, further, in this embodiment, a fourth through hole 270 is provided on the third connecting portion 250, and the fourth through hole 270 is connected to the inside of the moving contact 200. The fourth through hole 270 can be provided to discharge the heat in the moving contact 200 in time, thereby improving the heat dissipation effect.

[0082] Optionally, this embodiment does not specifically limit the layout and number of the fourth through holes 270 .

[0083] like Figure 3-Figure 5 As shown, in this embodiment, the side wall of the closing contact 300 is provided with a fifth through hole 310, and the fifth through hole 310 is connected to the inside of the closing contact 300. Along the radial direction of the moving contact 200, the projection of the fifth through hole 310 overlaps with the projection of one of the spring contact fingers 220, and the projection of the first through hole 110 overlaps with the projection of another spring contact finger 220. That is, the fifth through hole 310 is arranged corresponding to at least one spring contact finger 220, and the first through hole 110 is arranged corresponding to at least one spring contact finger 220. In this way, the heat around the two spring contact fingers 220 can be taken away to improve the heat transfer efficiency; the number of contact points between the spring contact fingers 220 and the stationary contact 100 and the moving contact 200 can also be increased (from the single-point contact between the traditional contact finger and the inner wall to the multi-point contact between the spring contact finger 220 and the edge of the fifth through hole 310 in this embodiment), the contact area is increased, the contact resistance is reduced, and the current flow capacity is improved. According to the skin effect principle, the current density around the fifth through hole 310 is increased, the current carrying capacity is enhanced, and the current carrying capacity is improved.

[0084] Optionally, the spring contact finger 220 in this embodiment can adopt a three-point contact (O-type) spring contact finger or a four-point contact (B-type) spring contact finger. Since the four-point contact spring contact finger has lower contact resistance and stronger current-carrying capacity than the three-point contact spring contact finger, the four-point contact spring contact finger is preferred in this embodiment.

[0085] Optionally, the first through hole 110, the second through hole 130, the third through hole 230, the fourth through hole 270 and the fifth through hole 310 in the present embodiment can all be set to one or can all be set to multiple, for example, the first through hole 110, the second through hole 130, the third through hole 230, the fourth through hole 270 and the fifth through hole 310 are all set to ten equal numbers, thereby improving the heat dissipation performance of the three-position switch 10 and improving safety.

[0086] like Figure 1 and Fig.14 As shown, this embodiment also provides a gas box 400, which mainly includes a housing 410, a circuit breaker 420, a first busbar 430, an insulator 440 and the above-mentioned three-position switch 10. The circuit breaker 420, the first busbar 430, the insulator 440 and the three-position switch 10 are all arranged in the housing 410, and the first busbar 430 is connected to the circuit breaker 420, one end of the insulator 440 is connected to the first busbar 430, and the other end is connected to the static contact 100 of the three-position switch 10. The gas box 400 has low cost, high safety, can improve heat transfer efficiency, and has good heat dissipation performance.

[0087] Specifically, if Figure 6-Figure 9 As shown, the circuit breaker 420 in this embodiment includes a vacuum interrupter 4201, a moving end contact seat 4202 and an elastic connector 4203. A conductive clip 4204 is provided on the outer peripheral side of the vacuum interrupter 4201. One end of the elastic connector 4203 is connected to the moving end contact seat 4202, and the other end of the elastic connector 4203 is connected to the conductive clip 4204. Optionally, the elastic connector 4203 and the conductive clip 4204 in this embodiment are both provided in plurality, and the plurality of elastic connectors 4203 are connected in parallel, and the elastic connector 4203 and the conductive clip 4204 are provided in one-to-one correspondence. In other words, the conductive clip 4204 in this embodiment is provided in a split body to improve reliability and safety. The provision of the elastic connector 4203 can realize a soft connection between the vacuum interrupter 4201 and the moving end contact seat 4202, thereby improving the flexibility and operability of the connection.

[0088] Optionally, four elastic connectors 4203 in this embodiment are arranged in parallel. According to the skin effect principle, the resistance of the elastic connectors 4203 arranged in parallel will be smaller, thereby increasing the current carrying capacity of the circuit breaker 420, improving the current carrying capacity, reducing the loss of electric energy, and saving costs.

[0089] Optionally, the elastic connecting member 4203 in this embodiment can be configured to be in a “Z” shape or a “U” shape.

[0090] like Fig. 9As shown, in this embodiment, the moving end contact seat 4202 includes a first lap joint surface 4205 and a second lap joint surface 4206, the first lap joint surface 4205 is connected to the first busbar 430, the second lap joint surface 4206 is provided with a sixth through hole 4207, and the moving end contact seat 4202 is also provided with an inspection hole 4208, and the sixth through hole 4207 and the inspection hole 4208 are both connected to the interior of the moving end contact seat 4202.

[0091] The first lap joint 4205 is provided for connection with the first busbar 430 to facilitate line output; a sixth through hole 4207 is provided on the second lap joint 4206, and the sixth through hole 4207 connects the inside and outside of the moving end contact seat 4202, thereby facilitating external airflow to enter the moving end contact seat 4202, and cooperates with the inspection hole 4208 at the front end of the moving end contact seat 4202 to quickly bring out the internal heat of the moving end contact seat 4202, thereby achieving the purpose of promoting rapid heat dissipation.

[0092] Optionally, the sixth through hole 4207 in this embodiment can be provided as one or more, so as to improve the heat dissipation performance of the circuit breaker 420 .

[0093] like Figure 6-Figure 9 As shown, in this embodiment, the circuit breaker 420 further includes a static end contact seat 4209, and the gas box 400 further includes a second busbar 450 and an outlet bushing 460. One end of the second busbar 450 is connected to the static end contact seat 4209, and the other end is connected to the outlet bushing 460. At the same time, an upper lap joint surface and a lower lap joint surface are provided on the static end contact seat 4209, and the second busbar 450 is connected to both the upper lap joint surface and the lower lap joint surface, thereby improving the stability and reliability of the connection between the second busbar 450 and the static end contact seat 4209.

[0094] like Figure 10-11 As shown, in this embodiment, the outlet bushing 460 includes a first mounting portion 4601 and a first conductive portion 4602, the end of the first conductive portion 4602 is connected to the second busbar 450, and the first mounting portion 4601 is sleeved on the first conductive portion 4602. The first mounting portion 4601 is an inner cone sleeve structure, and the first conductive portion 4602 connected to the second busbar 450 can be set as a plane structure to be suitable for the overlap of double-layer busbars; it can also be set as a step structure to be suitable for the overlap of 3-4 layers of busbars, thereby improving flexibility and applicability; at the same time, it can also effectively solve the problem of local heating caused by skin effect and adjacent effect in the overlap of multi-layer busbars without gaps.

[0095] For large current inflatable cabinets, the industry generally adopts the method of overhead outlet of the mother tube, so the outlet bushing 460 in this embodiment is inverted in the shell 410.

[0096] like Figure 1 , Figure 12-13As shown, in this embodiment, the gas box 400 further includes a third busbar 470 and a busbar bushing 480, one end of the third busbar 470 is connected to the closing contact 300, and the other end is connected to the busbar bushing 480. The busbar bushing 480 includes a second mounting portion 4801 and a second conductive portion 4802, the second conductive portion 4802 is connected to the third busbar 470, and the second mounting portion 4801 is connected to the second conductive portion 4802. By way of example, the second mounting portion 4801 can be sleeved on the second conductive portion 4802.

[0097] Exemplarily, the second conductive portion 4802 can be set to a planar structure to be suitable for the overlapping of double-layer busbars; it can also be set to a stepped structure to be suitable for the overlapping of 3-4 layers of busbars, thereby improving flexibility and applicability, and at the same time effectively solving the problem of local heating caused by skin effect and adjacent effect in the seamless overlapping of multiple layers of busbars.

[0098] Optionally, from the perspective of current carrying and heat dissipation, the first busbar 430, the second busbar 450 and the third busbar 470 in this embodiment are preferably flat copper busbars. According to a large amount of experimental data, the longer the busbar circumference of the same cross-sectional area, the better the current carrying capacity. Flat copper busbars should be selected as much as possible without increasing the cost. In addition, since the three-phase busbars affect each other after heating, the distance between the three phases should be increased as much as possible if the structural dimensions of the cabinet 500 allow. The larger the net distance between the phases, the better the heat dissipation effect of the temperature rise.

[0099] In this embodiment, the side wall and the top of the housing 410 are provided with heat dissipation fins, and the side wall and the top of the housing 410 are provided with pressure relief holes, and a pressure relief valve is installed at the pressure relief hole. Optionally, a plurality of heat dissipation fins can be provided to improve the heat dissipation capacity of the air box 400. The provision of the pressure relief valve can improve the safety performance of the air box 400. The operator can set different numbers of pressure relief valves according to actual needs.

[0100] The heat dissipation fins are respectively installed on the top and side of the air box 400 through the external welding studs of the air box 400. The installation of the heat dissipation fins will not increase the overall size of the gas cabinet (switch cabinet), and will not affect the normal connection of the gas cabinet. It facilitates the installation of the heat dissipation fins on the side wall of the air box 400 without increasing the width of the cabinet body 500, thereby improving the overall thermal conductivity and auxiliary heat dissipation capacity of the air box 400.

[0101] like Fig.15 As shown, this embodiment provides an inflatable cabinet, which mainly includes a cabinet body 500, a heat dissipation device 600, a sealing device 700 and the above-mentioned air box 400. The sealing device 700 is arranged on the air box 400 and is used to seal the air box 400. The heat dissipation device 600 is arranged on the side wall of the cabinet body 500 to accelerate the heat flow of other electrical components in the cabinet body 500, improve the heat dissipation efficiency of the inflatable cabinet, and improve safety.

[0102] Optionally, the heat dissipation device 600 may be configured as a heat dissipation pipe structure or a fin structure, which is not limited in this embodiment.

[0103] Furthermore, the air box 400 is arranged on the upper part of the cabinet 500, and the top of the upper shell and the rear part of the lower shell of the air box 400 are provided with installation holes for maintaining and installing larger electrical components. The installation holes are sealed by a sealing device 700, and a plurality of heat dissipation fins are also provided on the sealing device 700 to achieve the dual effects of sealing and heat dissipation.

[0104] Since the inflatable cabinet in this embodiment has the above-mentioned air box 400, the inflatable cabinet has good heat dissipation performance and safety performance, and can also achieve the purpose of cost saving.

[0105] Obviously, the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

[0106] Note that in the description of this specification, the reference terms "some embodiments", "other embodiments", etc., mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. Three-position switch, characterized in that: The invention comprises a stationary contact (100), a moving contact (200) and a closing contact (300), wherein one end of the moving contact (200) is connected to the stationary contact (100), and the other end of the moving contact (200) is connected to the closing contact (300); a first through hole (110) is provided on a side wall of the stationary contact (100); the first through hole (110) is located at the connection between the stationary contact (100) and the moving contact (200); and the first through hole (110) is configured to dissipate heat inside the stationary contact (100) and / or inside the moving contact (200).

2. The three-position switch according to claim 1, characterized in that: The outer peripheral side walls at both ends of the moving contact (200) are respectively provided with grooves (210), each of the grooves (210) is respectively provided with a spring contact finger (220), and at least one of the spring contact fingers (220) is respectively in contact with the moving contact (200) or the stationary contact (100); the groove (210) is provided with a third through hole (230), and the third through hole (230) is connected with the interior of the moving contact (200).

3. The three-position switch according to claim 2, characterized in that: The stationary contact (100) is provided with a first connecting portion (120), the first connecting portion (120) being used to connect to an insulator (440), a second through hole (130) being provided on a side wall of the first connecting portion (120), and the second through hole (130) being connected to the interior of the stationary contact (100).

4. The three-position switch according to claim 3, characterized in that: The moving contact (200) comprises a second connecting portion (240), a third connecting portion (250) and a fourth connecting portion (260); two ends of the third connecting portion (250) are respectively connected to the second connecting portion (240) and the fourth connecting portion (260); at least one groove (210) is respectively arranged on the second connecting portion (240) and the fourth connecting portion (260); the groove (210) is arranged corresponding to the spring contact finger (220); the diameter of the third connecting portion (250) is smaller than the diameter of the second connecting portion (240); and the diameter of the third connecting portion (250) is smaller than the diameter of the fourth connecting portion (260).

5. The three-position switch according to claim 4, characterized in that: The third connecting portion (250) is provided with a fourth through hole (270), and the fourth through hole (270) is connected to the interior of the moving contact (200).

6. The three-position switch according to claim 3, characterized in that: A fifth through hole (310) is provided on the side wall of the closing contact (300), and the fifth through hole (310) is connected to the interior of the closing contact (300); along the radial direction of the moving contact (200), the fifth through hole (310) is arranged corresponding to at least one of the spring contact fingers (220), and the first through hole (110) is arranged corresponding to at least one of the spring contact fingers (220).

7. An air box, characterized in that: The gas box (400) comprises a shell (410), a circuit breaker (420), a first busbar (430), an insulator (440) and a three-position switch according to any one of claims 1 to 6, wherein the circuit breaker (420), the first busbar (430), the insulator (440) and the three-position switch (10) are all arranged in the shell (410), and the first busbar (430) is connected to the circuit breaker (420), one end of the insulator (440) is connected to the first busbar (430), and the other end is connected to the static contact (100) of the three-position switch (10).

8. The air box according to claim 7, characterized in that The gas box (400) further comprises a third busbar (470) and a busbar bushing (480); one end of the third busbar (470) is connected to the closing contact (300), and the other end is connected to the busbar bushing (480); The busbar bushing (480) comprises a second mounting portion (4801) and a second conductive portion (4802), wherein the second conductive portion (4802) is connected to the third busbar (470), and the second mounting portion (4801) is connected to the second conductive portion (4802); The second conductive portion (4802) is a planar structure or a stepped structure; and / or, The gas box (400) further comprises a second busbar (450) and an outlet bushing (460), wherein one end of the second busbar (450) is connected to the circuit breaker (420), and the other end is connected to the outlet bushing (460); The outlet bushing (460) comprises a first mounting portion (4601) and a first conductive portion (4602), an end of the first conductive portion (4602) is connected to the second busbar (450), and the first mounting portion (4601) is connected to the first conductive portion (4602); The first conductive part (4602) is a planar structure or a stepped structure.

9. The air box according to claim 7, characterized in that: The circuit breaker (420) comprises a first lap joint (4205) and a second lap joint (4206), wherein the first lap joint (4205) is connected to the first busbar (430), and a sixth through hole (4207) is provided on the second lap joint (4206). The circuit breaker (420) is also provided with an inspection hole (4208), and both the sixth through hole (4207) and the inspection hole (4208) are connected to the interior of the circuit breaker (420).

10. Inflatable cabinet, characterized in that: The inflatable cabinet comprises a cabinet body (500), a heat dissipation device (600), a sealing device (700) and the air box described in claim 7, wherein the sealing device (700) is arranged on the air box (400) and is used to seal the air box (400), the heat dissipation device (600) is arranged on the side wall of the cabinet body (500), and the air box (400) is arranged on the upper part of the cabinet body (500).

Images