Novel branch box sleeve

Abstract

The utility model discloses a novel 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 embedded in the insulating sleeve close to the outer wall, the insulating sleeve is made of epoxy resin materials through injection molding, a heightened positioning convex ring protrudes from the middle of the insulating sleeve, and the outer wall of the insulating sleeve is provided with a positioning hole. The shielding net wraps the copper rod and is embedded into the positioning convex ring, the outer wall of the insulating sleeve is symmetrically arranged from the middle to the two ends and is in a circular truncated cone shape, when an external cable connector is connected, the circular truncated cone shape facilitates tight abutting and sleeving, and therefore the rapid connecting and fixing effect is achieved. According to the utility model, the external diameter of the sleeve is increased, and the internal and external diameters of the internal shielding net are increased at the same time, so that the insulation performance can be enhanced, and the withstand voltage and partial discharge level can be improved and is higher than the national standard requirement and can be expanded to 1250A.

Description

Technical Field

[0001] The utility model relates to the technical field of cable bushing applications, in particular to a new type of branch box bushing. Background Technique

[0002] The cable branch box bushing is a component used in cable branch boxes to play a role in protection and insulation. The cable branch box bushing is an important device to ensure the safety of cable connections and improve the reliability of the power grid. Selecting the appropriate bushing type and installing and using it correctly are crucial for ensuring the stable operation of the power system.

[0003] Traditional bushings cannot meet the insulation requirements, mainly because the inner diameter of the shielding net is relatively small. Since the shielding net is grounded and the conductor copper bar is at high voltage, to meet the current-carrying capacity of 630A, the outer diameter of the copper bar cannot be less than 22mm, and the outer diameter of the bushing at the shielding net is 70mm. The maximum inner diameter of the shielding net can only be 52mm. Thus, the theoretical distance between the shielding net and the conductive copper bar is at most 15mm. Considering the processing reasons of the shielding net itself, the position deviation of the shielding net embedded in the mold during production, and the influence when the epoxy resin material is injected into the mold, the minimum distance is less than 15mm. Therefore, the withstand voltage and partial discharge do not meet the requirements. Therefore, the utility model proposes a new type of branch box bushing. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a new type of branch box bushing, which can strengthen the insulation performance, improve the withstand voltage and partial discharge levels, be higher than the national standard requirements, and can be extended to 1250A by increasing the outer diameter of the bushing and simultaneously increasing the inner and outer diameters of the internal shielding net.

[0005] To solve the above technical problems, a technical solution adopted by the utility model is: providing a new type of branch box bushing, including an insulating bushing, a copper bar is sleeved on the inner wall of the insulating bushing, and a shielding net is embedded at a position close to the outer wall inside the insulating bushing;

[0006] Among them, the insulating bushing is injection-molded from epoxy resin material, and a raised positioning collar is protruded at the middle position of the insulating bushing. The shielding net wraps the copper bar and is embedded inside the positioning collar.

[0007] The utility model is further set as: the outer wall of the insulating bushing is symmetrically inwardly converged from the middle to both ends and is in a frustum shape.

[0008] Through the above technical solution, when connecting to the external cable joint, the frustum shape is convenient for tight abutting and sleeving, so as to achieve a fast connection and fixing effect.

[0009] The present utility model is further configured such that: an external convex ring is prominently provided at the middle position of the outer wall of the positioning convex ring, an annular card slot is provided at the middle position of one side of the external convex ring, and the insulating sleeve, the positioning convex ring and the 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 for socket installation with the internal copper bar, and the external convex ring can be used to position and fix the external connecting sleeve, and at the same time, the annular card slot can be used to snap-fix it.

[0011] The present utility model is further configured such that: the outer walls of the copper bars near the end faces are all provided in a flared shape, and connecting bolt holes are provided at the centers of the end faces.

[0012] Through the above technical solution, it is convenient to utilize the flared end face setting to bolt-connect and fix it with the external plug through the internally provided connecting bolt holes.

[0013] The present utility model is further configured such that: ring circles are provided on the end faces of the shielding net, positioning columns are penetrated through the middle of the outer wall of the insulating sleeve, and the end faces are abutted 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 provided shielding net, and the ring circle can be used to stably fix the shielding net, so that the withstand voltage and partial discharge meet the requirements.

[0015] The present utility model is further configured such that: the distance between the inner wall of the shielding net and the outer wall of the copper bar 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, so that the insulation effect can be further improved.

[0017] The present utility model is further configured such that: the length of the positioning convex ring is 69.5 mm.

[0018] Through the above technical solution, the insulation performance can be enhanced, the withstand voltage and partial discharge levels can be improved, which are higher than the national standard requirements, and it can be extended to 1250 A.

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

[0020] A novel branch box sleeve proposed by the present utility model can enhance the insulation performance, improve the withstand voltage and partial discharge levels, which are higher than the national standard requirements, and it can be extended to 1250 A by increasing the outer diameter of the sleeve and simultaneously increasing the inner and outer diameters of the internal shielding net. Brief Description of the Drawings

[0021] Figure 1 The prior art sectional structure diagram of the branch box bushing;

[0022] Figure 2 The sectional structure diagram of a novel branch box bushing of the present utility model.

[0023] In the figure: 100, insulating bushing; 101, positioning convex ring; 102, external convex ring; 103, clamping groove; 200, copper bar; 201, connecting bolt hole; 300, shielding net; 301, ring; 302, positioning post. Specific embodiments

[0024] The following elaborates on the preferred embodiments of the present utility model in conjunction with the accompanying drawings, so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making the protection scope of the present utility model more clearly defined.

[0025] As Figure 2 shown, a novel branch box bushing includes an insulating bushing 100. The outer wall of the insulating bushing 100 is symmetrically inwardly converging from the middle to both ends and is in a frustum shape, which is convenient for connecting external cable joints. The frustum shape facilitates tight abutting and sleeving, thereby achieving a quick connection and fixing effect. A copper bar 200 is sleeved inside the inner wall of the insulating bushing 100. The outer walls of the copper bar 200 near the end faces are both in a horn shape, and connecting bolt holes 201 are provided at the centers of the end faces, which is convenient for bolt connection and fixing with external plug joints through the internally provided connecting bolt holes 201 by using the horn-shaped end face setting. A shielding net 300 is embedded near the outer wall inside the insulating bushing 100. Rings 301 are provided at the end faces of the shielding net 300. A positioning post 302 penetrates through the middle of the outer wall of the insulating bushing 100, and the end face abuts against the outer wall of the shielding net 300. The positioning post 302 can fix the position of the internally provided shielding net 300, and the use of the ring 301 can stably fix the shielding net 300, thereby enabling the withstand voltage and partial discharge to meet the requirements. The distance between the inner wall of the shielding net 300 and the outer wall of the copper bar 200 is 27 mm, and the length of the shielding net 300 is 58 mm, ensuring the insulation distance and having sufficient redundancy, thereby further improving the insulation effect;

[0026] Among them, the insulating bushing 100 is injection-molded from epoxy resin material, and a raised positioning convex ring 101 is protruded at the middle position of the insulating bushing 100. The length of the positioning convex ring 101 is 69.5 mm, which can enhance the insulation performance, improve the withstand voltage and partial discharge level, higher than the national standard requirements, and can be extended to 1250 A. The shielding net 300 is wrapped around the copper bar 200 and embedded inside the positioning convex ring 101. An external convex ring 102 is protruded at the middle position of the outer wall of the positioning convex ring 101. An annular clamping groove 103 is opened at the middle position of one side of the external convex ring 102. The insulating bushing 100, the positioning convex ring 101 and the external convex ring 102 are integrally formed. The insulating bushing 100, the positioning convex ring 101 and the external convex ring 102 are integrally formed, so as to facilitate the socket installation of the entire insulating bushing 100 with the internal copper bar 200. At the same time, the external convex ring 102 can be used to position and fix the external connecting sleeve, and the annular clamping groove 103 can be used to clamp and fix it.

[0027] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A new type of branch box bushing, comprising an insulating bushing (100), characterized in that: A copper rod (200) is sleeved on the inner wall of the insulating bushing (100), and a shielding net (300) is embedded near the outer wall inside the insulating bushing (100); Among them, the insulating bushing (100) is injection-molded with epoxy resin material, and a raised positioning convex ring (101) is protruded at the middle position of the insulating bushing (100). The shielding net (300) wraps the copper rod (200) and is embedded inside the positioning convex ring (101).

2. The novel branch box bushing according to claim 1, characterized in that: The outer wall of the insulating bushing (100) is symmetrically inwardly converged from the middle to both ends and is in a frustum shape.

3. A novel branch box bushing according to claim 1, characterized in that: An external convex ring (102) is protruded at the middle position of the outer wall of the positioning convex ring (101). An annular clamping groove (103) is formed at the middle position of one side of the external convex ring (102). The insulating bushing (100), the positioning convex ring (101) and the external convex ring (102) are integrally formed.

4. A novel branch box bushing according to claim 1, characterized in that: The outer walls of the copper rod (200) near the end faces are both in a horn shape, and connection bolt holes (201) are formed at the centers of the end faces.

5. A novel branch box bushing according to claim 1, characterized in that: Ring circles (301) are arranged at the end faces of the shielding net (300). A positioning column (302) is penetrated through the middle of the outer wall of the insulating bushing (100), and the end face abuts against the outer wall of the shielding net (300).

6. A novel 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. A novel branch box bushing according to claim 1, characterized in that: The length of the positioning convex ring (101) is 69.5 mm.

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