CN207265590U - Wall bushing and the switchgear using the wall bushing - Google Patents

Abstract

It the utility model is related to a kind of wall bushing and the switchgear using the wall bushing.Wall bushing, including sleeve body, high-tension shielding net and low pressure gauze screen are interval with sleeve body, at least one in high-tension shielding net, low pressure gauze screen is support arm gauze screen, and support arm gauze screen includes gauze screen body and is arranged on the conductive supporting arm for being used for being supported on the positioning of support arm gauze screen in wall bushing moulding by casting on casting mold on gauze screen body.In wall bushing moulding by casting, conductive supporting arm is fixed with mould the positioning of support arm gauze screen can be supported on casting mold, the structure of required positioning mold is simple, solves the problems, such as that positioning mold complexity, complex forming technology, processing efficiency are low during wall bushing moulding by casting existing in the prior art.

Description

Wall bushing and switchgear using the wall bushing

technical field

The utility model relates to a wall-piercing bushing and a switchgear using the wall-piercing bushing.

Background technique

The wall bushing is widely used in the power switch cabinet of the power supply system, and it plays the role of excessive connection and insulation isolation for the high-voltage power supply line passing through the power switch cabinet. The authorized announcement is CN201667521U, and the patent document with the authorized announcement number 2010.12.08 discloses a wall-piercing bushing. As shown in Figure 1, the wall-piercing bushing includes an epoxy resin bushing body 11, a primary high-voltage lead 12 and two Install the flange 16, the epoxy resin sleeve body 11 is formed by casting epoxy resin through a mold, the outer arm has a plurality of umbrella discs 17, and the two installation flanges 16 are respectively arranged at the two ends of the epoxy resin sleeve 11 , and an integrated structure. An inner shielding net 14 made of metal wire is fixed on the inner arm of the epoxy resin sleeve body 11, and the inner shielding net 14 is connected to the insert 18 through a wire 15; an outer shielding net is embedded in the epoxy resin sleeve body 11 The net 13 and the outer shielding net 3 are connected to the ground with four bolts of the mounting flange 16 by wires. Before the wall-piercing bushing is cast and formed, a corresponding positioning structure is required to respectively position the inner shielding net 14, the outer shielding net 13 and the insert 18, etc., resulting in the problems of complex structure of the positioning mold, complex molding process, and low processing efficiency.

Utility model content

The purpose of this utility model is to provide a wall-piercing sleeve to solve the problems in the prior art that the positioning mold structure is complex, the molding process is complicated, and the processing efficiency is low when the wall-piercing sleeve is poured and formed; the purpose of the utility model is also The purpose is to provide a switchgear using the wall bushing.

In order to achieve the above purpose, the technical scheme of the wall bushing of the present invention and the switchgear using the wall bushing is:

The wall-piercing casing of the utility model adopts the following technical scheme:

Technical solution 1: The wall-piercing bushing, including the bushing body, is provided with a high-voltage shielding net and a low-voltage shielding net at intervals in the bushing body, at least one of the high-voltage shielding net and the low-voltage shielding net is a support arm shielding net, and the support arm shielding net It includes a shielding mesh body and a conductive support arm arranged on the shielding mesh body for positioning and supporting the shielding mesh of the support arm on the casting mold when the wall-through bushing is cast. When the wall-through casing is poured and formed, the conductive support arm can be fixed with the mold to position and support the support arm shielding net on the casting mold. The structure of the positioning mold required is simple, which solves the problem of wall-through casing casting in the prior art The problems of complex positioning mold, complex molding process and low processing efficiency during molding.

Technical solution 2: On the basis of technical solution 1, there are two conductive support arms of the shielding net of the support arm, and they are arranged along the radial direction of the shielding net of the support arm. Two conductive support arms are provided along the radial direction of the support arm shield net, which facilitates the coaxiality between the support arm shield net and the bushing body and saves material.

Technical solution 3: On the basis of technical solution 2, the conductive support arm includes a support rod and a mounting nut fixed at one end of the support rod. The connection between the conductive support arm and the wire is facilitated by installing the nut and the wire.

Technical solution 4: On the basis of technical solution 3, the support rod is made of stainless steel sheet. The stainless steel sheet is not only conductive, but the stainless steel sheet is relatively hard, which can better support the shielding net of the support arm.

Technical solution 5: On the basis of technical solution 4, the conductive support arm is welded on the shielding net body. The conductive support arm and the shielding net body are welded and fixed, and the connection stability is good.

Technical solution 6: On the basis of any one of technical solutions 1-5, the high-voltage shielding net and the low-voltage shielding net are both support arm shielding nets. Both the high-voltage shielding net and the low-voltage shielding net are support arm shielding nets to facilitate the positioning of the mold to the shielding net when pouring through the wall casing.

Technical solution 7: On the basis of any one of technical solutions 1-5, the edges of the high-voltage shielding net and the low-voltage shielding net are provided with curling arcs. The edge of the shielding net is provided with curling arcs to achieve a uniform electric field, avoiding the discharge phenomenon at the tip of the shielding net, and increasing the safety of the wall bushing.

Technical solution 8: On the basis of any one of technical solutions 1-5, the material of the high-voltage shielding net and the low-voltage shielding net is stainless steel. The hardness of the stainless steel material itself is better to ensure the overall hardness of the two shielding nets, so as to ensure that the two shielding nets do not deform during the pouring process.

Technical solution 9: On the basis of any one of technical solutions 1-5, the height of the high-voltage shielding net is more than twice the height of the low-voltage shielding net. It can better reduce the electric field near the central hole for the busbar to pass through, and improve the insulation level of the wall bushing.

The beneficial effects of the wall-piercing bushing of the utility model: the high-voltage shielding net and the low-voltage shielding net of the wall-piercing bushing are both support arm shielding nets, and when the wall-piercing bushing is cast and formed, the conductive support arm can be fixed with a mould. The positioning support of the arm shielding net is on the pouring mold, and the required positioning mold has a simple structure, which solves the problems in the prior art that the positioning mold is complicated, the molding process is complicated, and the processing efficiency is low when the wall-through casing is poured and formed.

The switchgear of the present utility model adopts following technical scheme:

Technical solution 1: The switch cabinet includes a cabinet body and a wall-piercing bushing connected to the cabinet body. The wall-piercing bushing includes a bushing body, and a high-voltage shielding net and a low-voltage shielding net are arranged at intervals inside the bushing body. The high-voltage shielding net, At least one of the low-voltage shielding nets is a support arm shielding net, and the support arm shielding net includes a shielding net body and a shield set on the shielding net body for positioning and supporting the support arm shielding net on the casting mold when the wall-through bushing is cast. Conductive support arm.

Technical solution 2: On the basis of technical solution 1, there are two conductive support arms of the shielding net of the support arm, and they are arranged along the radial direction of the shielding net of the support arm.

Technical solution 3: On the basis of technical solution 2, the conductive support arm includes a support rod and a mounting nut fixed at one end of the support rod.

Technical solution 4: On the basis of technical solution 3, the support rod is made of stainless steel sheet.

Technical solution 5: On the basis of technical solution 4, the conductive support arm is welded on the shielding net body.

Technical solution 6: On the basis of any one of technical solutions 1-5, the high-voltage shielding net and the low-voltage shielding net are both support arm shielding nets.

Technical solution 7: On the basis of any one of technical solutions 1-5, the edges of the high-voltage shielding net and the low-voltage shielding net are provided with curling arcs.

Technical solution 8: On the basis of any one of technical solutions 1-5, the material of the high-voltage shielding net and the low-voltage shielding net is stainless steel.

Technical solution 9: On the basis of any one of technical solutions 1-5, the height of the high-voltage shielding net is more than twice the height of the low-voltage shielding net.

Description of drawings

Fig. 1 is a sectional view of a wall-piercing sleeve in the prior art;

Fig. 2 is the front view of the specific embodiment 1 of the wall bushing of the present invention;

Fig. 3 is the sectional view of A-A in Fig. 2;

Fig. 4 is the perspective view of the low-voltage shielding net in Fig. 3;

Figure 5 is a perspective view of the high-voltage shielding net in Figure 3;

In Figure 1: 11-epoxy resin pipe body, 12-high voltage lead wire, 13-outer shielding net, 14-inner shielding net, 15-wire, 16-installation flange, 17-umbrella disc, 18-insert;

From Figure 2 to Figure 5: 1-low voltage shielding net, 2-high voltage shielding net, 3-installation nut at high voltage end, 4-sleeve body, 5-insulating flange plate, 6-central hole, 7-installation nut at low voltage end , 8-support rod.

Detailed ways

The embodiment of the wall-piercing bushing of the present invention and the switchgear using the wall-piercing bushing will be further described below in conjunction with the accompanying drawings.

Specific embodiment one of the wall-piercing sleeve of the present utility model, as shown in Fig. 2 to Fig. 5, the wall-piercing sleeve includes a sleeve body 4 integrally casted with epoxy resin through the APG process, and the outer device of the sleeve body 4 There are sheds with staggered sizes, which are used to increase the creepage distance of the bushing to ensure that the wall bushing has sufficient creepage distance so that the wall bushing has a better insulation effect. The wall bushing body 4 is provided with an insulating flange plate 5 for installing the wall bushing, and the center of the insulating flange plate 5 is provided with a central hole 6 for the busbar to pass through.

As shown in Figure 3, in order to improve the insulation level of the wall bushing and avoid partial discharge of the wall bushing, a high-voltage shielding net 2 and a low-voltage shielding net 1 are arranged at intervals inside the bushing body 4, and the high-voltage shielding net 2 and the low-voltage shielding net The shielding net 1 is coaxially arranged with the central hole 6 . It should be noted that there must be a sufficient distance between the high-voltage shielding network 2 and the low-voltage shielding network 1 to increase the thickness of the insulating layer between the two shielding networks to ensure that the insulating medium will not be broken down. In order to increase the insulation level of the wall bushing, preferably, the height of the high-voltage shielding net 2 is twice the height of the low-voltage shielding net 1 , and in other embodiments, the height of the high-voltage shielding net is more than twice the height of the low-voltage shielding net. The low-voltage shielding net 1 and the high-voltage shielding net 2 are made of stainless steel expanded metal mesh as a whole, which can not only play a role in uniform electric field and reduce partial discharge value, but also the hardness of stainless steel expanded mesh is strong, which can ensure the casting process Among them, the low-voltage shielding net 1 and the high-voltage shielding net 2 will not be impacted and deformed by the flowing epoxy resin mixture. In addition, the mesh structure can also ensure the fluidity of the epoxy resin during casting, and avoid internal defects such as dark air holes and material shortages in the sleeve body 4 . In other embodiments, the low-voltage shielding net 1 and the high-voltage shielding net 2 can be made of aluminum alloy and other materials. In order to avoid discharge at the sharp edge of the shielding mesh, further optimize the epoxy layer of the wall bushing and the field strength in the air, and reduce the overall partial discharge value of the wall bushing, the edges of the low-voltage shielding mesh 1 and the high-voltage shielding mesh 2 are crimped For arc treatment, the preferred curling arc is designed as a ring with a diameter of 4 mm.

In order to facilitate the positioning and support of the high-voltage shielding net 2 and the low-voltage shielding net 1 during the forming process of the wall bushing, the high-voltage shielding net 2 and the low-voltage shielding net 1 in this embodiment are both support arm shielding nets, and the support arm shielding nets include The shielding mesh body and the conductive support arm arranged on the shielding mesh body are used for positioning and supporting the shielding mesh of the support arm on the casting mold when the wall-through bushing is poured and formed. In other embodiments, only the high voltage shielding net is the support arm shielding net or only the low voltage shielding net is the support arm shielding net. One end of the conductive support arm is connected to the shielding net body, and the other end is connected to the wire. For the convenience of the connection of the conductive support arm and the wire, the conductive support arm in the present embodiment includes a support rod 8 and a support rod fixed at one end of the support rod 8 for Mounting nuts for connecting wires. In other embodiments, the conductive support arm can use a stainless steel sheet with conductive and supporting positioning functions, and the stainless steel sheet is not provided with a mounting nut, and a positioning hole is directly opened on the stainless steel sheet. The support rods 8 in this embodiment are all connected to the shielding net body by welding with good connection stability. In other embodiments, the support rods and the shielding net body can be connected by bonding, riveting and other connection methods. In this embodiment, the mounting nut connected to the high-voltage shielding net 2 is the high-voltage end mounting nut 3 , and the mounting nut connected to the low-voltage shielding net 1 is the low-voltage end mounting nut 7 . As shown in Figure 4, the low-voltage shielding network 1 is provided with two conductive support arms symmetrically in the circumferential direction, that is, it includes two support rods 8 and two low-voltage end installation nuts 7 corresponding to the support rods 8, and the support rods 8 are set at the low-voltage The outer side of the shielding net 1. During use, the low-voltage end installation nut 7 of the wall bushing is used for connecting with the metal plate of the switch cabinet and grounding. One end of the two support rods 8 connected to the high-voltage shielding net 2 is welded to the radial interior of the high-voltage shielding net 2, and the other end is fixed with two high-voltage end installation nuts 3, and the high-voltage end installation nuts 3 are connected to the busbar with a short wire, and the busbar high pressure introduction.

The support rod 8 in this embodiment is made of stainless steel sheet with better supporting effect. In other embodiments, the support rod 8 can be made of copper sheet, aluminum alloy sheet and other conductive parts with the same support and conduction effect. When pouring the bushing body 4, the low-voltage shielding net 1 can be fixed with the mold slider through the low-voltage end mounting nut 7 to realize the positioning support for the low-voltage shielding net 1, and the high-voltage shielding net 2 is connected to the bottom of the mold through the high-voltage end mounting nut 3. The core is fixed to realize the positioning support for the high-voltage shielding net 2. When the wall-piercing bushing is cast and formed, no mold is required to individually position the low-voltage shielding net 1, the low-voltage end mounting nut 7, the high-voltage shielding net 2, and the high-voltage end mounting nut 3, etc. separately, and the mold structure is simple and the molding process is simple. Preferably, the mounting nut 7 at the low-voltage end and the mounting nut 3 at the high-voltage end in this embodiment are all made of copper nuts with better electrical conductivity. When the wall bushing is installed and used, the wall bushing is installed on the metal side plate of the cabinet through the low-voltage end mounting nut 7. At this time, the low-voltage shielding net 1 is fixedly connected to the low-voltage end mounting nut 7 through the support rod 8, Connect the low-voltage shielding network 1 with the metal side plate of the cabinet and ground it; the high-voltage shielding network 2 is connected to the busbar with a wire through the high-voltage end installation nut 3, and the high voltage of the busbar is introduced; the busbar passes through the central hole 6 through the wall sleeve Tube. The structural design of the wall bushing can solve the local corona between the busbar and the wall bushing, and the phenomenon of no discharge between the busbar and the metal cabinet, and improve the air gap between the busbar and the wall bushing. The distribution of the electric field can make the partial discharge of the wall bushing reach zero partial discharge under the voltage of 1.1 Ur. In addition, the low-voltage shielding net 1, the high-voltage shielding net 2, the low-voltage end mounting nut 7 and the high-voltage end mounting nut 3 are integrally casted with epoxy resin through the APG process, which can effectively reduce the occurrence of local insulation aging of the wall bushing and avoid damage caused by insulation. The local aging of the material results in insufficient insulation capacity, which improves the reliability of the overall operation of the wall bushing. At the same time, during the pouring and molding process of the wall-piercing sleeve, the mold positioning structure is simple, which makes the processing and molding process of the wall-piercing sleeve simpler.

A specific embodiment of the switch cabinet of the present utility model, the switch cabinet includes a cabinet body and a wall-piercing bushing connected to the cabinet body, the wall-piercing bushing in this embodiment is the same The wall bushing has the same structure and will not be repeated here.

Claims (18)

1. wall bushing, including sleeve body, high-tension shielding net and low pressure gauze screen are interval with sleeve body, its feature It is that at least one in high-tension shielding net, low pressure gauze screen is support arm gauze screen, support arm gauze screen includes gauze screen body It is used to the positioning of support arm gauze screen is supported on casting mold in wall bushing moulding by casting with being arranged on gauze screen body On conductive supporting arm.

2. wall bushing according to claim 1, it is characterized in that, the conductive supporting arm of the support arm gauze screen is equipped with two It is a, and along the radial arrangement of support arm gauze screen.

3. wall bushing according to claim 2, it is characterized in that, conductive supporting arm includes supporting rod and is fixed on supporting rod The installation nut of one end.

4. wall bushing according to claim 3, it is characterized in that, the supporting rod is made of stainless steel substrates.

5. wall bushing according to claim 4, it is characterized in that, the conductive supporting arm is welded on gauze screen body.

6. according to the wall bushing described in claim 1-5 any one, it is characterized in that, the high-tension shielding net and low pressure shielding Net is support arm gauze screen.

7. according to the wall bushing described in claim 1-5 any one, it is characterized in that, the high-tension shielding net and low pressure shielding Network edge is equipped with crimping circular arc.

8. according to the wall bushing described in claim 1-5 any one, it is characterized in that, the high-tension shielding net and low pressure shielding Net materials are stainless steel.

9. according to the wall bushing described in claim 1-5 any one, it is characterized in that, the height of the high-tension shielding net is low More than 2 times of pressure shielding net height.

10. switchgear, including cabinet and the wall bushing that is connected on cabinet, wall bushing include sleeve body, sleeve body High-tension shielding net and low pressure gauze screen are inside interval with, it is characterized in that, at least one in high-tension shielding net, low pressure gauze screen is Support arm gauze screen, support arm gauze screen include gauze screen body and are arranged on gauze screen body to be used to pour into a mould in wall bushing Support arm gauze screen is positioned to the conductive supporting arm being supported on casting mold during shaping.

11. switchgear according to claim 10, it is characterized in that, the conductive supporting arm of the support arm gauze screen is equipped with two It is a, and along the radial arrangement of support arm gauze screen.

12. switchgear according to claim 11, it is characterized in that, conductive supporting arm includes supporting rod and is fixed on supporting rod The installation nut of one end.

13. switchgear according to claim 12, it is characterized in that, the supporting rod is made of stainless steel substrates.

14. switchgear according to claim 13, it is characterized in that, the conductive supporting arm is welded on gauze screen body.

15. according to the switchgear described in claim 10-14 any one, it is characterized in that, the high-tension shielding net and low voltage screen It is support arm gauze screen to cover net.

16. according to the switchgear described in claim 10-14 any one, it is characterized in that, the high-tension shielding net and low voltage screen Cover network edge and be equipped with crimping circular arc.

17. according to the switchgear described in claim 10-14 any one, it is characterized in that, the high-tension shielding net and low voltage screen It is stainless steel to cover net materials.

18. according to the switchgear described in claim 10-14 any one, it is characterized in that, the height of the high-tension shielding net is More than 2 times of low pressure shielding net height.