Air tank for switch cabinet and switch cabinet

Abstract

This utility model provides an air box for a switch cabinet and a switch cabinet. The air box includes a housing and an insulating sleeve (21). The insulating sleeve (21) passes through the housing and is fixed to the housing by a fixing member (3). The housing is grounded. The air box is sealed. The conductive part of the insulating sleeve (21) is connected to one end of a bus connector (22). The other end of the bus connector (22) is used to connect to the insulating sleeve of another switch cabinet. The bus connector (22) has a conductive part (223). The air box also includes a conductive elastic member (4), whose two ends are respectively connected to the housing. The conductive elastic member (4) is attached to the conductive part (223) of the bus connector (22) and avoids the fixing member (3). The conductive elastic member (4) is stretched into an arc shape.

Description

Technical Field

[0001] This utility model relates to the field of power systems, and in particular to a gas box for switchgear and a switchgear. Background Technology

[0002] Gas-insulated switchgear is a very important piece of equipment in power systems, and it is widely used in various places including power plants, substations, industrial and mining enterprises, residential communities, and railways.

[0003] Gas-insulated switchgear has a sealed gas box, which includes a housing and an insulating bushing. The insulating bushing passes through and is fixed to the housing. A circuit breaker is installed inside the gas box, and this circuit breaker is electrically connected to another switchgear through the insulating bushing. To ensure the safety of personnel, the gas box grounding must be continuous, so the housing is grounded. For parallel use, a busbar connector connects the conductive parts in the insulating bushing of the gas box to the conductive parts in the insulating bushing of another switchgear, thus placing the busbar connector between the two switchgear units. Utility Model Content

[0004] In view of this, the present invention proposes a gas box for switchgear, the gas box comprising a shell and an insulating sleeve, the insulating sleeve passing through the shell and fixed to the shell by a fastener, the shell being grounded, the gas box being sealed, the conductive part of the insulating sleeve being connected to one end of a busbar connector, the other end of the busbar connector being used to connect to the insulating sleeve of another switchgear, the busbar connector having a conductive part, and the gas box further comprising:

[0005] A conductive elastic element has its two ends connected to the housing. The conductive elastic element is attached to the conductive part of the bus connector and avoids the fixing element. The conductive elastic element is stretched into an arc shape.

[0006] When the insulating sleeve is fixed with a fastener, the conductive elastic element is connected to the grounded housing, and the conductive elastic element is attached to the conductive part, so that the conductive part is always grounded. As a result, the potential of the outer surface of the bus connector is 0V. This structure is simple, low in cost, and easy to install.

[0007] Optionally, according to the air box described above, the portion of the conductive elastic element used to abut against the conductive part is a contact section, which is a non-linear structure, or the contact section is a tension spring or elastic sheet. This avoids cutting the bus connector.

[0008] Optionally, according to the air box described above, at least a portion of the conductive elastic element abuts against the side wall of the air box; or

[0009] In the direction perpendicular to the side plate of the housing containing the insulating sleeve, the height of the conductive elastic element is lower than the height of the fixing element.

[0010] Optionally, according to the air box described above, the bus connector includes an insulating cylinder and a contact conductive component, the contact conductive component being disposed within the insulating cylinder, and the conductive part being a conductive layer located on the outer wall of the insulating cylinder.

[0011] Optionally, according to the air box described above, the conductive elastic element further includes:

[0012] Two connecting parts are located at the two ends of the conductive elastic element, and the connecting parts are used to fix the element to the housing.

[0013] Two elastic sections are connected to a connecting part, and a contact section is located between the two elastic sections;

[0014] Two line segments, which are respectively connected between one of the elastic segments and the abutment segment.

[0015] This structure is simple and easy to implement.

[0016] According to the gas box described above, it may optionally include at least one of the following structures:

[0017] The conductive elastic element is a tension spring;

[0018] The connecting part is hook-shaped and can be hooked onto the housing;

[0019] The line segment can bypass the fixing member.

[0020] Optionally, based on the air box described above, each elastic segment includes several sub-elastic segments, which are connected by line segments.

[0021] Optionally, according to the air box described above, the conductive elastic element has three tension springs, with the middle tension spring resting against the conductive part, and the other two tension springs located near the ends of the conductive elastic element. This design is cost-effective and easy to implement.

[0022] Optionally, according to the gas box described above, the housing also has through holes, and the two ends of the conductive elastic element can be hooked into the through holes.

[0023] This utility model also provides a switch cabinet, including a gas box for a switch cabinet as described in any of the preceding claims. Attached Figure Description

[0024] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can more clearly understand the above and other features and advantages of the present invention. In the drawings:

[0025] Figure 1 This is a partial schematic diagram of the gas box for switchgear according to the present invention.

[0026] Figure 2 This is a structural schematic diagram of an air box for a switch cabinet according to the present invention, taken at one angle.

[0027] Figure 3 This is a structural schematic diagram of the gas box for switchgear according to the present invention from another angle.

[0028] The reference numerals in the attached figures are as follows:

[0029] 11-Side panel

[0030] 12-Top Plate

[0031] 21-Insulating sleeve

[0032] 22-Bus Connector

[0033] 221-Insulating Cylinder

[0034] 222-Contact Conductive Components

[0035] 223-Conductive part

[0036] 3-Factors

[0037] 4-Conductive elastic element

[0038] 41-Abutting Section

[0039] 42-Connecting part

[0040] 43-Elastic segment

[0041] 44-Line Segment

[0042] 5-Through Hole

[0043] 6-Protrusion Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this utility model clearer, the following embodiments are provided to further illustrate this utility model in detail. The nouns and pronouns referring to "person" in this patent application are not limited to specific genders.

[0045] This utility model provides a gas box for switchgear. The gas box includes a housing and an insulating sleeve. The insulating sleeve passes through the housing and is fixed to the housing by a fastener, and the housing is grounded. Figure 1This is a partial schematic diagram of the gas box for switchgear according to the present invention. Figure 2 This is a structural schematic diagram of an air box for a switch cabinet according to the present invention, taken at one angle. Figure 3 This is a structural schematic diagram of the gas box for switchgear according to the present invention from another angle.

[0046] like Figure 2 and Figure 3 As shown, the switch cabinet generally has three phases, namely phase A, phase B and phase C. Each phase has an insulating bushing 21. The following explanation will take one phase as an example.

[0047] Specifically, the gas box is sealed and filled with an insulating gas, which is sulfur hexafluoride or a clean gas. A three-position circuit breaker (not shown in the figure) can be installed in the gas box and connected to an insulating sleeve 21 on the housing via a conductor busbar (not shown in the figure). This insulating sleeve 21 can be electrically connected to external equipment, for example, through the insulating sleeve 21 and busbar connector 22, and further electrically connected to another switch cabinet. Since the busbar connector 22 connects two switch cabinets, there must be a certain gap between the two switch cabinets. Part of the busbar connector 22 will be located within this gap. To prevent accidental contact with this part, the surface potential of the busbar connector 22 needs to be 0V. The busbar connector 22 is provided with a conductive part 223, which can be grounded, thus ensuring that the surface potential of the busbar connector 22 is 0V. As an example, the bus connector 22 includes an insulating cylinder 221 and a contact conductive component 222. The contact conductive component 222 is inserted into the insulating cylinder 221. One end of the contact conductive component 222 is connected to the conductive element of the insulating sleeve 21, and the other end is connected to the insulating sleeve of another switchgear. The conductive part 223 can be a conductive layer, for example, made of silver, sprayed on the outside of the insulating cylinder 221. The conductive layer is annular, or it can be a metal conductive ring set on the bus connector 22, which can be selected according to actual needs. In this way, when the conductive part 223 is grounded, the potential of the surface of the bus connector 22 is 0V. However, due to the presence of the fixing member 3, grounding the conductive part 223 by using a copper busbar makes it inconvenient, and using a soft connection is very expensive. Therefore, the inventors have devised a lower-cost method for grounding the conductive part 223.

[0048] like Figures 1 to 3 As shown, the gas box also includes a conductive elastic element 4, which is used to electrically connect the grounded housing and the conductive part 223, thereby grounding the conductive part 223. The two ends of the conductive elastic element 4 are respectively connected to the housing. The conductive elastic element 4 abuts against the conductive part 223 of the bus connector 22 and avoids the fixing member 3. The conductive elastic element 4 is stretched into an arc shape.

[0049] like Figures 1 to 3 As shown, when the conductive elastic element 4 is attached to the conductive part 223, the conductive elastic element 4 is subjected to tensile force and forms an arc shape. More specifically, the conductive elastic element 4 is parabolic, with the vertex of the parabola attached to the conductive part 223, and both ends of the conductive elastic element 4 are connected to the housing. Since the housing is grounded, the conductive elastic element 4 is also grounded, which in turn makes the conductive part 223, to which the conductive elastic element 4 is attached, also grounded, thus ensuring that the conductive part 223 is grounded.

[0050] The conductive elastic element 4 is arc-shaped. Because it is in contact with the conductive part 223, it is subjected to tension, which allows the conductive elastic element 4 to be tightly in contact with the conductive part 223, thereby ensuring the grounding of the conductive part 223.

[0051] As an example, the portion of the conductive elastic element 4 that abuts against the bus connector 22 is the abutment section 41, which is a non-linear structure. A non-linear structure means that the portion abutting against the bus connector 22 is not linear, thus avoiding cuts to the bus connector 22. For example, the insulating cylinder 221 is typically made of resin, and the conductive part 223 has a conductive layer formed on the outside of the resin material, such as a silver coating to prevent oxidation. To ensure contact between the conductive elastic element 4 and the conductive part 223, the conductive elastic element 4 needs to be subjected to a certain tensile force. This also applies pressure to the conductive part 223. If the portion of the conductive elastic element 4 contacting the conductive part 223 were linear, the conductive elastic element 4 would gradually sink into the conductive part 223, potentially damaging it. As another example, the abutment section 41 can be a tension spring or an elastic sheet. Tension springs are easily deformable, facilitating installation, while elastic sheets increase the contact area between the conductive elastic element 4 and the conductive part 223, reducing heat generation.

[0052] The shell here can be a rectangular box with four side plates 11, a top plate 12, and a bottom plate, which together form the shell. The shell can be made of metal, such as copper, aluminum, or stainless steel, depending on the specific requirements.

[0053] As an example, the housing also has through holes 5, and the two ends of the conductive elastic element 4 can be hooked into the through holes 5. This fixing method facilitates installation. It should be noted that the through holes 5 will not compromise the airtightness of the gas box. Figure 3As shown, the gas box is cubical. The side plate 11 through which the insulating sleeve 21 passes is partially higher than the top plate 12. The through hole 5 on the side plate 11 can be located at this higher part. The side plate 11 through which the insulating sleeve 21 passes can also be provided with a protrusion 6, which is located below the insulating sleeve 21. The through hole 5 is provided on the protrusion 6, so as not to damage the box structure. The conductive elastic element 4 can be hooked into the two through holes 5 respectively. The protrusion 6 here can be as follows: Figure 2 and Figure 3 The implementation shown uses a U-shaped plate fixed to the housing. This U-shaped plate is long enough to have three through holes 5, allowing the conductive elastic element 4 corresponding to each phase's insulating sleeve 21 to be hooked into its respective through hole 5. As an example, multiple through holes 5 can be provided on each side of the same insulating sleeve 21, accommodating different types of conductive elastic elements to meet the needs of various customers.

[0054] Based on the structure of the gas box described above, when the insulating sleeve 21 is fixed by the fixing member 3, the conductive elastic member 4 is connected to the grounded shell, and the conductive elastic member 4 is attached to the conductive part 223, so that the conductive part 223 is always grounded, and the potential of the outer surface of the bus connector 22 is 0V. This structure is simple, low in cost, and easy to install.

[0055] As an example, the side plate 11 of the housing containing the insulating sleeve 21 is likely adjacent to the housing containing the insulating sleeve 21 of another switchgear. That is, the gas boxes of the two switchgears are close together. To avoid the conductive elastic element 4 affecting the other switchgear, for example, conductive elastic elements 4 are provided on both opposing side plates 11. Therefore, at least a portion of the conductive elastic element 4 can be placed against the side wall of the gas box, thus preventing mutual interference between the components of the two switchgears. Alternatively, the height of the conductive elastic element 4 can be lower than the height of the fixing element 3 in the direction perpendicular to the side plate 11 of the housing containing the insulating sleeve 21.

[0056] As an example, such as Figures 1 to 3As shown, the conductive elastic element 4 also includes two connecting portions 42, two elastic segments 43, and two line segments 44. The two connecting portions 42 are located at both ends of the conductive elastic element 4 and are used to fix it to the housing. The two elastic segments 43 are each connected to one connecting portion 42, and the abutment segment 41 is located between the two elastic segments 43. The two line segments 44 are each connected between one elastic segment 43 and the abutment segment 41. For example, the two connecting portions 42 can be hook-shaped, thus hooking onto the housing, such as hooking onto the through hole 5 of the housing; or the connecting portions 42 can be plate-shaped, fixed to the housing by bolts, thus providing higher reliability; or the connecting portions 42 can be snap-fit ​​portions, snapping onto the housing. The specific structure of the connecting portions 42 can be set according to actual needs. The conductive elastic element 4 can specifically be a tension spring or an elastic sheet, which can be set according to actual needs and will not be elaborated here. The elastic segments 43 are used to provide tension, so that the abutment segment 41 of the conductive elastic element 4 can tightly abut against the conductive portion 223. This structure is simple and easy to implement.

[0057] For example, each elastic segment 43 may also include several sub-elastic segments, such as two or three sub-elastic segments, which are connected by line segments. This allows the conductive elastic element 4 to deform more freely. The sub-elastic segments here can also be tension springs or elastic sheets, or other conductive elastic elements, which will not be elaborated here.

[0058] As a specific illustrative example, such as Figure 1 and Figure 2 As shown, the conductive elastic element 4 has three tension spring segments. The middle tension spring segment serves as a contact part, which abuts against the conductive part 223 of the bus connector 22. The other two tension spring segments serve as elastic segments 43. Each tension spring segment is connected by a line segment 44. In this way, the entire conductive elastic element 4 can both avoid the fixing part 3 through the line segment 44 and maintain a certain elastic force. Manufacturing this conductive elastic element 4 can be achieved by stretching the two middle segments of a tension spring into line segments 44, which is relatively inexpensive and convenient to implement.

[0059] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A gas box for a switchgear, the gas box comprising a housing and an insulating sleeve (21), the insulating sleeve (21) passing through the housing and fixed to the housing by a fastener (3), the housing being grounded, the gas box being sealed, the conductive part of the insulating sleeve (21) being connected to one end of a bus connector (22), the other end of the bus connector (22) being used to connect to an insulating sleeve of another switchgear, characterized in that, The bus connector (22) has a conductive part (223), and the air box further includes: The conductive elastic element (4) is connected to the housing at both ends. The conductive elastic element (4) is attached to the conductive part (223) of the bus connector (22) and avoids the fixing element (3). The conductive elastic element (4) is stretched into an arc shape.

2. The gas box according to claim 1, characterized in that, The portion of the conductive elastic element (4) that is used to abut against the conductive part (223) is abutting section (41), which is a non-linear structure or a tension spring or elastic sheet.

3. The air box according to claim 1, characterized in that, At least a portion of the conductive elastic element (4) abuts against the side wall of the gas box; or In the direction perpendicular to the side plate (11) of the housing where the insulating sleeve (21) is located, the height of the conductive elastic element (4) is lower than the height of the fixing element (3).

4. The gas box according to claim 1, characterized in that, The bus connector (22) includes an insulating cylinder (221) and a contact conductive component (222). The contact conductive component (222) is inserted into the insulating cylinder (221). The conductive part (223) is a conductive layer located on the outer wall of the insulating cylinder (221).

5. The air box according to claim 2, characterized in that, The conductive elastic element (4) further includes: Two connecting parts (42) are located at the two ends of the conductive elastic element (4), and the connecting parts (42) are used to fix the shell; Two elastic segments (43) are connected to a connecting part (42) respectively, and an abutting segment (41) is located between the two elastic segments (43); Two line segments (44) are respectively connected between one of the elastic segments (43) and the abutment segment (41).

6. The air box according to claim 5, characterized in that, It includes at least one of the following structures: The conductive elastic element (4) is a tension spring; The connecting part (42) is hook-shaped and can be hooked onto the housing; The line segment (44) can bypass the fixing member (3).

7. The air box according to claim 6, characterized in that, Each elastic segment (43) includes several sub-elastic segments (43), and the sub-elastic segments (43) are connected by line segments (44).

8. The air box according to claim 1, characterized in that, The conductive elastic element (4) has three tension springs. The middle tension spring is used to abut against the conductive part (223), and the other two tension springs are respectively close to the ends of the conductive elastic element (4).

9. The gas box according to any one of claims 1-8, characterized in that, The housing also has a through hole (5), and the two ends of the conductive elastic element (4) can be hooked into the through hole (5).

10. A switch cabinet, characterized in that, Includes the gas box for switchgear as described in any one of claims 1-9.

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