Sleeve and inflatable cabinet

Abstract

The utility model relates to a cable, a wire or a protection tube used by the cable, the wire or the protection tube mounted on or in a building, an equivalent structure or a vehicle, in particular to a sleeve and a gas-insulated switchgear. The sleeve comprises an insulating jacket and a conductor, a cavity is arranged in the conductor, a cavity blocking structure is arranged at the position, close to at least one end of the conductor, of the cavity, and / or a cavity blocking structure is arranged in the cavity. The conductor in the sleeve is arranged to be the cavity conductor, and the part of conductor material through which no current passes in the working process is omitted, so that the waste of the material when the conductor is cast can be reduced, the utilization rate of the material is improved, and the production and use cost of the sleeve can be reduced. The arrangement of the cavity plugging structure and / or the cavity blocking structure can block a channel between the upper end and the lower end of the sleeve, so that air sealing between the upper end and the lower end of the sleeve is realized, and the air tightness of different air chambers in the whole or inside of the gas-insulated switchgear in the actual working process is ensured. The sleeve provided by the utility model can be arranged on the surface of the gas-insulated switchgear or between two gas chambers in the gas-insulated switchgear.

Description

Technical Field

[0001] The utility model relates to a protective tube for installing cables or wires or the used cables or wires on or inside a building, an equivalent structure or a vehicle, and in particular to a casing and an inflatable cabinet. Background Art

[0002] As the capacity of the power grid continues to increase, the demand for bushings, as the main components of the gas charging cabinet, continues to increase. The bushing is installed in the primary circuit of the gas charging cabinet and needs to withstand the normal operating current of the high-voltage circuit, the short-time rated dynamic thermal stability current, the short-circuit current of the short-circuit breaking, etc., and block the upper and lower ends of the bushing.

[0003] At present, most bushings use solid conductors, which play the role of carrying current and connecting electrical equipment. For example, the Chinese patent application with application publication number CN111355138A discloses a sealed busbar connection bushing for an inflatable cabinet, which includes a conductive rod and an insulator wrapped around the outside of the conductive rod. The outer surface of the insulator is provided with a flange along the circumferential direction, and a mounting insert is provided on the flange. A shielding net is provided at a position opposite to the flange in the insulator, and the shielding net is connected to the mounting insert, wherein the conductive rod is a solid conductor. Another example is the Chinese utility model patent with announcement number CN205265433U discloses a plug-in wiring bushing assembly, including a conductive column and a solid insulating member fixedly sleeved on the radial outer side of the conductive column, the solid insulating member has a front plug-in section plugged into the bushing jack on the switch cabinet, and a stop flange is provided on the solid insulating member at the rear of the front plug-in section for matching with the outer side of the switch cabinet to stop the seal, and the stop flange extends or distributes along the axial direction of the guide column, wherein the conductive column is a solid column.

[0004] The conductive rods and conductive columns in the prior art are both solid conductors. Although this type of casing can achieve conductive connection, it is subject to the influence of the skin effect. In actual work, no current flows through the center of the solid conductor, resulting in excessive use of materials and high manufacturing costs for the casing. In addition, the casing generates a lot of heat during operation, and the existing casing using solid conductors also has the problem of low heat dissipation efficiency. Utility Model Content

[0005] The purpose of the utility model is to provide a sleeve to solve the problems of low material utilization and high manufacturing cost of existing sleeves; at the same time, the purpose of the utility model is also to provide an inflatable cabinet equipped with the above-mentioned sleeve to solve the problem of high cost of existing inflatable cabinets.

[0006] In order to achieve the above purpose, the utility model sleeve adopts the following technical solutions:

[0007] The bushing comprises an insulating jacket and a conductor penetrating the insulating jacket, wherein a cavity is arranged in the conductor, a cavity sealing structure is arranged near at least one end of the cavity close to the conductor, and / or a cavity blocking structure is arranged in the cavity.

[0008] The beneficial effect of the above technical solution is that the utility model is improved on the basis of the existing bushing. Specifically, according to the characteristic that the bushing is subject to the influence of the skin effect during the actual working process, the utility model sets the conductor in the bushing as a cavity conductor, omitting the part of the conductor material where no current passes during the working process, which can reduce the waste of materials when casting the conductor, improve the utilization rate of materials, and reduce the production and use cost of the bushing. The setting of the cavity blocking structure and / or the cavity blocking structure can block the channel between the upper end and the lower end of the bushing, and prevent the gas in the air chamber where the lower end of the bushing is located from flowing out.

[0009] Furthermore, the conductor comprises a central tube body, at least one end of the central tube body is provided with a plug, and the cavity is enclosed by the central tube body and the plug.

[0010] Furthermore, the plug and the central tube body are detachably connected or welded.

[0011] The plug and the central tube body are connected in a detachable manner, which is conducive to replacing the plug or the central tube body when the tube body fails or is damaged; the welding connection is adopted, the connection between the plug and the central tube body is more firm, and the structure of the conductor is more stable.

[0012] Furthermore, the conductor includes a central tube body, a blocking wall is arranged in the central tube body, the cavity is formed by an inner hole of the central tube body, and the blocking wall constitutes the cavity blocking structure.

[0013] Furthermore, the inner wall surface of the cavity constitutes a heat dissipation surface, and the conductor is provided with a heat dissipation hole connecting the cavity with the air chamber outside the sleeve.

[0014] The heat dissipation hole is connected with the air chamber outside the bushing, so that the heat generated by the bushing during operation can be conducted to the heat dissipation hole through the inner wall surface of the conductor cavity, so that the heat generated by the bushing during operation can be dissipated through the heat dissipation hole, and the temperature rise of the tube body during operation can be controlled to ensure its normal operation.

[0015] Furthermore, the heat dissipation hole is located at one end of the conductor which is connected to the wire when in use.

[0016] Furthermore, a plurality of heat dissipation holes are arranged on the circumferential surface of the conductor.

[0017] Arranging a plurality of heat dissipation holes on the peripheral surface of the central tube body can further improve the heat dissipation effect of the sleeve.

[0018] Furthermore, a groove for installing a sealing ring is provided on the circumferential surface of the conductor.

[0019] The cooperation between the groove and the sealing ring can improve the sealing between the central tube body and the insulating jacket, thereby improving the air tightness of the sleeve.

[0020] Furthermore, the plug is provided with a hole for connecting with other conductive parts.

[0021] In order to achieve the above purpose, the utility model inflatable cabinet adopts the following technical solutions:

[0022] An inflatable cabinet comprises a cabinet body and a sleeve installed on the cabinet body for connecting the inside and outside of the cabinet body, the sleeve comprising an insulating jacket and a conductor passing through the insulating jacket, a cavity is provided in the conductor, a cavity sealing structure is provided at at least one end of the cavity close to the conductor, and / or a cavity blocking structure is provided in the cavity.

[0023] The beneficial effect of the above technical solution is that the utility model is improved on the basis of the existing bushing. Specifically, according to the characteristic that the bushing is subject to the influence of the skin effect during the actual working process, the utility model sets the conductor in the bushing as a cavity conductor, omitting the part of the conductor material where no current passes during the working process, which can reduce the waste of materials when casting the conductor, improve the utilization rate of materials, and reduce the production and use cost of the bushing. The setting of the cavity sealing structure and / or the cavity blocking structure can block the passage between the upper end and the lower end of the bushing, prevent the inert gas inside the inflatable cabinet from flowing out, and can also prevent the outside air from entering the inflatable cabinet through the conductor, thereby ensuring the airtightness of the inflatable cabinet during the actual working process.

[0024] Furthermore, the conductor comprises a central tube body, at least one end of the central tube body is provided with a plug, and the cavity is enclosed by the central tube body and the plug.

[0025] Furthermore, the plug and the central tube body are detachably connected or welded.

[0026] Furthermore, the conductor includes a central tube body, a blocking wall is arranged in the central tube body, the cavity is formed by an inner hole of the central tube body, and the blocking wall constitutes the cavity blocking structure.

[0027] Furthermore, the inner wall surface of the cavity constitutes a heat dissipation surface, and the conductor is provided with a heat dissipation hole connecting the cavity with the air chamber outside the sleeve.

[0028] Furthermore, the heat dissipation hole is located at one end of the conductor which is connected to the wire when in use.

[0029] Furthermore, a plurality of heat dissipation holes are arranged on the circumferential surface of the conductor.

[0030] Furthermore, a groove for installing a sealing ring is provided on the circumferential surface of the conductor.

[0031] Furthermore, the plug is provided with a hole for connecting with other conductive parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a cross-sectional view of a specific embodiment 1 of the sleeve of the utility model;

[0033] Figure 2 In the specific embodiment of the utility model sleeve Figure 1 The enlarged view of point A in the middle;

[0034] Figure 3 This is a first structural schematic diagram of the conductor in a specific embodiment of the bushing of the utility model;

[0035] Figure 4 This is a second structural schematic diagram of the conductor in a specific embodiment of the bushing of the utility model.

[0036] In the figure: 1. insulating jacket, 2. conductor, 3. shielding net, 4. insert, 5. heat dissipation hole, 6. plug, 7. center tube body, 8. groove, 9. sealing ring. DETAILED DESCRIPTION

[0037] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0038] The principle of the sleeve of the utility model is as follows:

[0039] The sleeve provided by the utility model can be arranged on the outer wall of the inflatable cabinet, or between two air chambers inside the inflatable cabinet. The inflatable cabinet includes a cabinet body, which is a cabinet wall used to enclose the air chamber inside the inflatable cabinet. The cabinet body is provided with a sleeve insertion hole, and the sleeve is assembled on the cabinet body through the sleeve insertion hole to electrically connect the inside of the cabinet body with the outside or to electrically connect the two air chambers inside the cabinet. The structure of the cabinet body of the inflatable cabinet is a prior art, so it is not described in detail.

[0040] Most of the conductors in the bushings in the prior art are solid conductors. The bushings are subject to the influence of the skin effect. The current passes through the surface of the solid conductor, and no current passes through the center of the solid conductor, resulting in excessive use of materials and increased production and use costs. According to the skin effect characteristics of the bushing in actual working conditions, the utility model sets the conductor 2 in the bushing as a cavity conductor, omitting the conductor material of the part where no current passes during the working process, which can reduce the waste of materials when casting the conductor, improve the utilization rate of materials, and reduce the production cost of the bushing.

[0041] Based on the above-mentioned principle, the embodiment 1 of the sleeve described in the utility model is:

[0042] like Figure 1 As shown, the bushing includes an insulating jacket 1, a conductor 2, a shielding net 3, an insert 4 and a sealing ring 9. The conductor 2 is inserted into the insulating jacket 1 and is made of copper or other metal conductive materials. It plays the role of carrying current and connecting electrical equipment. The shielding net 3 is connected to the earth or the grounding body to introduce the ground potential into the bushing body or the outer surface of the bushing, thereby improving the distribution of the electric field in the bushing. The shielding net 3 is connected to the insert 4, and the shielding net 3 and the insert 4 are integrally cast inside the insulating jacket 1. When in use, the screw passes through the cabinet body of the gas cabinet and is threadedly connected to the insert 4, thereby fixing the bushing on the cabinet body of the gas cabinet. The bushing electrically connects the inside and outside of the gas cabinet or electrically connects the two air chambers in the gas cabinet.

[0043] The structure of the tube body 2 can refer to Figure 3 , including a central tube body 7 and plugs 6 arranged at both axial ends of the central tube body 7. The central tube body 7 and the two plugs 6 are connected together by threads, and the central tube body 7 and the two plugs 6 together form a cavity structure in the tube body 2. In this way, the center of the tube body 2 is a cavity structure. In actual application scenarios, the material of the part of the tube body 2 where no current passes can be saved. When applied to large-scale production scenarios, it can greatly reduce the waste of useless materials in the conductor, improve the utilization rate of materials, and greatly save production costs. Of course, in certain circumstances, such as Figure 4 As shown, the plug 6 can be provided at only one end of the central tube 7, and a cavity blocking structure can be provided in the central tube, so that the central tube 7, the plug 6 and the cavity blocking structure can enclose the cavity structure of the tube 2, and at the same time meet the sealing requirements of the sleeve during operation; or the plug 6 can be provided at only one end of the central tube 7, and no structure can be provided at the other end and inside of the central tube 7; or the plug 6 can be provided at both ends of the central tube 7, and a cavity blocking structure can be provided inside the central tube 7; or the plug 6 can be provided at neither end of the central tube 7, and only a cavity blocking structure can be provided inside the central tube 7, as long as the sealing requirements of the tube 2 during operation can be met. The cavity blocking structure is specifically a blocking wall, and can also be a structure in other forms such as a wire plug that can block the cavity, and the cavity blocking structure is made of conductive material or insulating material.

[0044] Furthermore, as a preferred implementation scheme, the central tube body 7 and the plug 6 may also be connected together by welding, which can improve the stability and air tightness of the overall structure of the tube body 2.

[0045] Based on the above-mentioned principle and embodiment 1, embodiment 2 of the sleeve of the utility model is:

[0046] Based on Example 1, this example is further optimized. Figure 1 , Figure 3 As shown, the key point of this embodiment is that when the sleeve is set between the two air chambers inside the inflatable cabinet, a heat dissipation hole 5 is also set on the circumference of one end of the central tube body 7. The heat dissipation hole 5 penetrates the wall of the central tube body 7, so that the inner cavity of the central tube body 7 (i.e., the cavity in the tube body 2) can be connected with the air chamber outside the sleeve. The heat generated by the sleeve during operation can be dissipated through the cavity and the heat dissipation hole 5, thereby avoiding excessive temperature rise of the sleeve during operation. It is worth noting that when the sleeve is set on the surface of the inflatable cabinet, it is not necessary to set heat dissipation holes on the circumference of the central tube body.

[0047] Further, as a preferred embodiment, when the sleeve is disposed between two air chambers inside the inflatable cabinet, a plurality of heat dissipation holes 5 can be evenly arranged on the circumference of one end of the central tube body 7 to better dissipate heat for the sleeve.

[0048] Based on the above-mentioned principle and embodiments 1 and 2, embodiment 3 of the sleeve of the utility model is:

[0049] Based on the examples 1 and 2, this example is further optimized. Figure 1-4 As shown, a circumferential groove 8 is provided on the outer circumferential surface of the central tube body 7, and a sealing ring 9 is installed inside the groove 8. The sealing ring 9 can make the conductor 2 conveniently installed into the interior of the insulating jacket 1 from top to bottom, and at the same time, after the installation of the conductor 2 and the insulating jacket 1 is completed, the conductor 2 and the insulating jacket 1 are sealed, thereby realizing the airtightness between the upper end and the lower end of the sleeve.

[0050] Furthermore, the plug 6 may have one or more connection holes for connecting to other conductive parts, thereby facilitating the arrangement and connection of electrical components in the charging cabinet.

[0051] The specific implementation of the inflatable cabinet of the present invention comprises a cabinet body and a sleeve. The specific structure of the sleeve is the same as the sleeve structure in the embodiment of the sleeve introduced above, and will not be described in detail herein.

[0052] It should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0053] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

[0054] 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 description and drawings of the present invention shall be included in the protection scope of the present invention.

Claims

1. A bushing, comprising an insulating jacket and a conductor passing through the insulating jacket, characterized in that: A cavity is provided in the conductor, and a cavity blocking structure is provided at least at one end of the cavity close to the conductor, and / or a cavity blocking structure is provided in the cavity.

2. The sleeve according to claim 1, characterized in that: The conductor comprises a central tube body, at least one end of which is provided with a plug, and the cavity is enclosed by the central tube body and the plug.

3. The sleeve according to claim 2, characterized in that: The plug and the central tube body can be detachably connected or welded.

4. The sleeve according to claim 1, characterized in that: The conductor comprises a central tube body, a blocking wall is arranged in the central tube body, the cavity is formed by the inner hole of the central tube body, and the blocking wall forms the cavity blocking structure.

5. The sleeve according to any one of claims 1 to 4, characterized in that: The inner wall surface of the cavity constitutes a heat dissipation surface, and the conductor is provided with a heat dissipation hole connecting the cavity with the outside of the sleeve.

6. The sleeve according to claim 5, characterized in that: The heat dissipation hole is located at one end of the conductor connected to the wire when in use.

7. The sleeve according to claim 5, characterized in that: A plurality of heat dissipation holes are arranged on the circumferential surface of the conductor.

8. The sleeve according to any one of claims 1 to 4, characterized in that: A groove for installing a sealing ring is arranged on the circumferential surface of the conductor.

9. The sleeve according to claim 2 or 3, characterized in that: The plug is provided with a hole for connecting with other conductive parts.

10. An inflatable cabinet, comprising a cabinet body and a sleeve installed in the cabinet body for connecting the inside and outside of the cabinet body, characterized in that: The sleeve is the sleeve described in any one of claims 1 to 9.

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