Improved branch box sleeve

Abstract

The utility model discloses an improved branch box sleeve, which comprises an insulating sleeve, a copper rod is sleeved on the inner wall of the insulating sleeve, a shielding net is arranged in the insulating sleeve, the insulating sleeve is formed by injection molding of epoxy resin materials, a positioning extension part is arranged at the middle position of the outer wall of the insulating sleeve in a lengthened manner, and the shielding net is arranged in the positioning extension part. A positioning protruding ring is arranged in the middle of the outer wall of the positioning extending part, the shielding net is arranged in the positioning protruding ring, the interior of the shielding net and the copper rod are wrapped, and the inner diameter and the outer diameter of the insulating sleeve are smoothly and gradually reduced from the middle to the two ends and are arranged in a circular truncated cone shape, so that when an external cable connector is connected, the cable connector can be conveniently connected. And the circular truncated cone facilitates tight abutting and sleeving. According to the utility model, through lengthening and enlarging the whole and internal shielding nets of the sleeve, the insulation performance is solved, the voltage resistance and partial discharge level of the sleeve are higher than the national standard requirement, and the sleeve can be matched with a standard C-type cable joint.

Description

Technical Field

[0001] The utility model relates to the technical field of cable bushing applications, in particular to an improved branch box bushing. Background Art

[0002] In a 35kV cable branch box, the branch box bushing is the most important component. Its function is to connect and fix two or more cables by cooperating with the cable connector. Its insulation performance and mechanical properties (strength) must meet national standards and actual usage requirements.

[0003] The traditional branch box bushing is a C-type bushing of the European standard EN 50181. This bushing can fully meet the requirements for 10-24kV cable branch boxes. However, for 35kV cable branch boxes, the national standard requires insulation performance of power frequency withstand voltage: 95kV / 1 minute, partial discharge: no more than 10pC at 45kV. The traditional bushing cannot fully meet the requirements and needs to be installed and fixed with a corresponding special cable connector. Therefore, the utility model proposes an improved branch box bushing. Utility Model Content

[0004] The technical problem to be solved by the present invention is to provide an improved branch box bushing. By lengthening and enlarging the overall bushing and the internal shielding net, the insulation performance is improved, the pressure resistance and partial discharge level of the bushing are made higher than the national standard requirements, and it can match the standard C-type cable connector.

[0005] In order to solve the above technical problems, the present invention adopts a technical solution: to provide an improved branch box bushing, comprising an insulating bushing, the inner wall of which is sleeved with a copper rod, and a shielding net is provided inside the insulating bushing;

[0006] Among them, the insulating sleeve is injection molded by epoxy resin material, and a positioning extension portion is extended in the middle position of the outer wall of the insulating sleeve. A positioning protrusion is provided in the middle position of the outer wall of the positioning extension portion. The shielding net is arranged inside the positioning protrusion, and the inside is wrapped with the copper rod.

[0007] The utility model is further configured as follows: the inner and outer diameters of the insulating sleeve are configured to be smoothly and gradually reduced from the middle to both ends, and are configured in a frustum-shaped manner.

[0008] Through the above technical solution, when connecting the external cable connector, the frustum setting facilitates tight abutment and sleeve connection, thereby achieving a quick connection and fixing effect.

[0009] The utility model is further configured as follows: an external convex ring is fixedly connected to the middle position of the outer wall of the positioning convex ring, a card slot is opened in the middle position of the side wall of the external convex ring, and the insulating sleeve, positioning extension, positioning convex ring and external convex ring are integrally formed.

[0010] Through the above technical solution, the insulating sleeve, the positioning convex ring and the external convex ring are integrally formed, so that the entire insulating sleeve is convenient to be installed when being sleeved with the internal copper rod, and the external convex ring can be used to position and fix the external connecting sleeve, and the annular groove can be used to clamp and fix it.

[0011] The utility model is further configured as follows: the outer walls of the copper rods are all arranged in a trumpet shape near the end faces, and a connecting bolt hole is opened at the center of the end faces.

[0012] The above technical solution facilitates the use of the trumpet-shaped end face to connect and fix it with the external plug connector through the connecting bolt holes provided inside.

[0013] The utility model is further configured as follows: the end faces of the shielding net are all provided with rings, a positioning column is provided through the middle of the outer wall of the insulating sleeve, and the end face is tightly pressed against the outer wall of the shielding net.

[0014] Through the above technical solution, the positioning column can be used to fix the position of the internally arranged shielding net, and the ring can be used to stably fix the shielding net, thereby ensuring that the withstand voltage and partial discharge meet the requirements.

[0015] The present invention is further configured as follows: the distance between the inner wall of the shielding net and the outer wall of the copper rod is 27 mm, and the length of the shielding net is 58 mm.

[0016] Through the above technical solution, the insulation distance is guaranteed and there is sufficient redundancy, thereby further improving the insulation effect.

[0017] The present invention is further configured as follows: the length of the positioning extension portion is 105.5 mm and the outer diameter is 70 mm, and the length of the positioning bead is 69.5 mm.

[0018] Through the above technical solution, the insulation performance can be enhanced, the voltage resistance and partial discharge levels can be improved, which are higher than the national standard requirements, and can be expanded to 1250A. The extended positioning extension can position and fix the entire sleeve when connected to the external cable connector.

[0019] The beneficial effects of the utility model are as follows:

[0020] The utility model proposes an improved branch box bushing, which lengthens and enlarges the overall bushing and the internal shielding net, thereby improving the insulation performance and making the bushing's pressure resistance and partial discharge levels higher than the national standard requirements, and can match the standard C-type cable connector. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional structural diagram of the branch box casing in the prior art;

[0022] Figure 2 This is a cross-sectional structural diagram of an improved branch box sleeve of the utility model.

[0023] In the figure: 100, insulating sleeve; 101, positioning extension; 102, positioning convex ring; 103, external convex ring; 104, slot; 200, copper rod; 201, connecting bolt hole; 300, shielding net; 301, ring; 302, positioning column. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0025] like Figure 1-Figure 2 As shown, an improved branch box sleeve includes an insulating sleeve 100. The inner and outer diameters of the insulating sleeve 100 are smoothly and gradually reduced from the middle to the two ends, and are arranged in a frustum. When connecting to the external cable connector, the frustum is arranged to facilitate a tight fit, thereby achieving a quick connection and fixing effect. The inner wall of the insulating sleeve 100 is sleeved with a copper rod 200. The outer wall of the copper rod 200 is arranged in a trumpet shape near the end face, and a connecting bolt hole 201 is opened at the center of the end face, which is convenient for using the trumpet-shaped end face to make it bolted and fixed with the external plug connector through the connecting bolt hole 201 arranged inside. The inside of the insulating sleeve 100 is convenient for A shielding mesh 300 is embedded near the outer wall, and a ring 301 is provided on the end face of the shielding mesh 300. A positioning post 302 is provided through the middle of the outer wall of the insulating sleeve 100, and the end face is pressed against the outer wall of the shielding mesh 300. The positioning post 302 can be used to fix the position of the shielding mesh 300 set inside, and the ring 301 can be used to stably fix the shielding mesh 300, thereby ensuring that the withstand voltage and partial discharge meet the requirements. The distance between the inner wall of the shielding mesh 300 and the outer wall of the copper rod 200 is 27 mm, and the length of the shielding mesh 300 is 58 mm, ensuring the insulation distance and sufficient redundancy, thereby further improving the insulation effect;

[0026] Among them, the insulating sleeve 100 is injection molded from epoxy resin, and a positioning extension portion 101 is extended in the middle of the outer wall of the insulating sleeve 100. The length of the positioning extension portion 101 is 105.5 mm and the outer diameter is 70 mm. The extended positioning extension portion 101 can position and fix the entire sleeve when connected to the external cable connector. A positioning convex ring 102 is provided in the middle of the outer wall of the positioning extension portion 101. The length of the positioning convex ring 102 is 69.5 mm, which can enhance the insulation performance, improve the withstand voltage and partial discharge level, which is higher than the national standard requirements and can be expanded to 1250A. The shielding net 300 is arranged inside the positioning convex ring 102, and the internal It is wrapped with the copper rod 200, and an external convex ring 103 is protruding from the middle of the outer wall of the positioning convex ring 102. An annular groove 104 is provided in the middle of one side of the external convex ring 103. The insulating sleeve 100, the positioning extension 101, the positioning convex ring 102 and the external convex ring 103 are integrally formed. The insulating sleeve 100, the positioning extension 101, the positioning convex ring 102 and the external convex ring 103 are integrally formed, so that the entire insulating sleeve 100 is convenient for sleeve installation with the internal copper rod 200, and the external convex ring 103 can be used to position and fix the external connecting sleeve, and the annular groove 104 can be used to clamp and fix it.

[0027] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An improved branch box bushing, comprising an insulating bushing (100), characterized in that: A copper rod (200) is sleeved on the inner wall of the insulating sleeve (100), and a shielding net (300) is provided inside the insulating sleeve (100); The insulating sleeve (100) is injection-molded from an epoxy resin material, a positioning extension portion (101) is provided at a lengthened position in the middle of the outer wall of the insulating sleeve (100), a positioning convex ring (102) is provided at a middle position of the outer wall of the positioning extension portion (101), and the shielding net (300) is provided inside the positioning convex ring (102), and the inside is wrapped with the copper rod (200).

2. The improved branch box bushing according to claim 1, characterized in that: The inner and outer diameters of the insulating sleeve (100) are smoothly and gradually reduced from the middle to both ends, and are arranged in a frustum-like configuration.

3. The improved branch box bushing according to claim 1, characterized in that: An external convex ring (103) is fixedly connected to the middle of the outer wall of the positioning convex ring (102), a clamping groove (104) is provided at the middle of the side wall of the external convex ring (103), and the insulating sleeve (100), the positioning extension portion (101), the positioning convex ring (102) and the external convex ring (103) are integrally formed.

4. The improved branch box bushing according to claim 1, characterized in that: The outer walls of the copper rods (200) are all arranged in a trumpet shape near the end faces, and a connecting bolt hole (201) is provided at the center of the end faces.

5. The improved branch box bushing according to claim 1, characterized in that: The end faces of the shielding net (300) are each provided with a ring (301), and a positioning column (302) is provided through the middle of the outer wall of the insulating sleeve (100), and the end face is pressed against the outer wall of the shielding net (300).

6. The improved branch box bushing according to claim 1, characterized in that: The distance between the inner wall of the shielding net (300) and the outer wall of the copper rod (200) is 27 mm, and the length of the shielding net (300) is 58 mm.

7. The improved branch box bushing according to claim 1, characterized in that: The length of the positioning extension portion (101) is 105.5 mm and the outer diameter is 70 mm, and the length of the positioning bead (102) is 69.5 mm.

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