Inner shielding insulation type installation structure of outgoing line sleeve
By introducing insulating pads and insulating sleeves into the integrated structure of the inner shield and connecting ear, the capacitance problem between the shielding cylinder and the conductive rod is solved, resulting in more stable assembly and reduced production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-29
- Publication Date
- 2026-03-31
AI Technical Summary
In existing SF6 gas-filled bushings with end-screen terminals, the capacitance requirements between the shielding cylinder and the conductive rod are difficult to meet, and the assembly stability of the split insulating ears is poor, resulting in high manufacturing costs and instability.
The inner shield and connecting ear are integrally molded, combined with insulating pads and insulating sleeves, and connected to the riser seat by bolts and threads to achieve insulation between the inner shield and the riser seat. Rubber or insulating paint materials are used to improve stability.
This improved the stability and strength of the internal shielding structure, reduced manufacturing costs, and met capacitance requirements.
Smart Images
Figure CN224067479U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to an internal shielding and insulating installation structure for an outgoing sleeve. Background Technology
[0002] SF6 gas-filled bushings with end-screen terminals have capacitance requirements between the internal shielding cylinder and the conductive rod. The shielding cylinder is insulated from the riser (or transition flange) and can withstand a 2kV, 1-minute power frequency voltage. Current insulation methods involve fixing insulating ears (or insulating ribs) to the outer wall of the shielding cylinder. This results in a "split" structure between the insulating ears and the shielding cylinder, meaning they are made of different materials (the shielding cylinder is conductive). Therefore, manufacturing costs are high, and the assembly stability of the split insulating ears is poor. Summary of the Invention
[0003] This utility model provides an internally shielded and insulated installation structure for a cable outlet bushing to solve the problems existing in the prior art.
[0004] The technical solutions adopted in this utility model are as follows:
[0005] An internal shielding insulation installation structure for a bushing includes a bushing body and an inner shield. A riser is fixed to the bottom end of the bushing body. A connecting lug integrally formed with the inner shield is provided on the outer wall of the inner shield. A stepped surface is provided on the inner wall of the riser. An insulating pad is supported on the stepped surface. The connecting lug of the inner shield is supported on the insulating pad. An insulating sleeve is passed through the connecting lug and through the insulating pad. A bolt is passed through the insulating sleeve and threadedly connected to the riser.
[0006] Furthermore, the insulating pad is a right-angled pad, and the connecting ear is supported on the right-angled surface of the insulating pad.
[0007] Furthermore, the insulating sleeve has a T-shaped structure.
[0008] This utility model has the following beneficial effects:
[0009] This invention incorporates an insulating structure (i.e., an insulating pad and an insulating sleeve) at the assembly point of the structure, integrating the connecting ear and the inner shield into a single unit, resulting in better structural stability, higher strength, and better performance. Attached Figure Description
[0010] Figure 1 This is a structural diagram of the present utility model.
[0011] Figure 2 This is a partial enlarged view of the present invention. Detailed Implementation
[0012] The present invention will be further described below with reference to the accompanying drawings.
[0013] like Figure 1 and Figure 2 This utility model discloses an internal shielding insulation installation structure for a cable outlet bushing, comprising a bushing body 1 and an inner shield 2. A riser seat 3 (or transition flange) is fixed to the bottom end of the bushing body 1. A connecting lug 21 integrally formed with the inner shield is provided on the outer wall of the inner shield 2. A stepped surface is provided on the inner wall of the riser seat 3, and an insulating pad 4 is supported on the stepped surface. The connecting lug 21 of the inner shield 2 is supported on the insulating pad 4. A bolt passes through the connecting lug 21 and the insulating pad 4 and is threadedly connected to the riser seat 3.
[0014] This application incorporates insulating pads on the connecting ear 21 and the riser 3 to achieve insulation between the inner shield 2 and the riser 3. Therefore, during manufacturing, it is not necessary to make the connecting ear 21 on the outer wall of the inner shield 2 into an insulating structure; the connecting ear 21 is directly integrally formed with the inner shield 2, ensuring the overall strength of the inner shield 2.
[0015] The insulating pad 4 is a right-angle pad, and the connecting ear 21 is supported on the right-angle surface of the insulating pad 4. The right-angle side of the insulating pad 4 is "blocked" from the side of the connecting ear 21 to prevent conduction at the side.
[0016] The bolt is a metal bolt. To prevent the inner shield 2 and the riser 3 from being connected through the bolt, an insulating sleeve 5 is fitted on the bolt. The insulating sleeve 5 passes through the insulating pad 4. The insulating sleeve has a T-shaped structure, and the T-head of the bolt abuts against the T-head of the insulating sleeve 5.
[0017] To meet the capacitance requirements, the inner shielding cylinder needs to be lengthened, and the corresponding riser 3 also needs to be lengthened to ensure sufficient installation space for the shielding cylinder inside the bushing. To ensure the installation stability of the inner shield 2, multiple sets of insulating installation structures can be set between the riser 3 and the inner shield 2, that is, an additional connecting lug 21 can be set on the outer wall of the inner shield 2, and a raised rib can be set on the inner wall of the riser 3 (see...). Figure 1 (Enlarged B), its installation structure is similar to Figure 1 The same applies to area A when magnified, so I won't repeat it here.
[0018] The insulating pads and insulating sleeves in this application are made of rubber or metal materials coated with insulating varnish.
[0019] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements can be made without departing from the principle of the present utility model, and these improvements should also be considered within the protection scope of the present utility model.
Claims
1. An inner shield insulated installation structure of an outlet bushing, comprising a bushing body (1) and an inner shield (2), characterized by: The sleeve body (1) is fixed with a raised seat (3) at the bottom end, a connecting lug (21) integrally formed with the inner shield is arranged on the outer wall of the inner shield (2), a stepped surface is arranged on the inner wall surface of the raised seat (3), the stepped surface supports an insulating pad (4), the connecting lug (21) of the inner shield (2) is supported on the insulating pad (4), an insulating sleeve (5) is arranged on the connecting lug (21), the insulating sleeve (5) passes through the insulating pad (4), a bolt is arranged in the insulating sleeve (5), and the bolt is threadedly connected with the raised seat (3).
2. The inner shielded installation structure of an outlet bushing according to Claim 1, characterized in that: The insulating pad (4) is a right-angle pad, and the connecting lug (21) is supported on the right-angle surface of the insulating pad (4).
3. The inner shielded insulation installation of a line outlet bushing according to claim 1, characterized in that: The insulating sleeve (5) is a T-shaped structure.