Transformer bushing mounting hole stamping structure
By using cold-rolled steel plates to form a boss structure at the transformer bushing mounting hole and installing a sealing gasket, the problems of water accumulation and seepage in the transformer bushing mounting structure were solved, resulting in cost reduction and improved product reliability.
Patent Information
- Application Number
- CN202520252588.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-18
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-02-18
AI Technical Summary
In the existing technology, the bushing installation structure of 10kV oil-immersed distribution transformers is prone to water accumulation or seepage due to mechanical stress or thermal deformation, which increases the complexity and cost of the welding process for the riser seat.
The transformer bushing mounting hole is stamped, and the box cover is made of cold-rolled steel plate by stamping to form a boss structure that is higher than the plane of the box cover. A sealing gasket is set on the boss to prevent water accumulation and seepage.
It effectively solved the problems of water accumulation and seepage at the transformer bushing, reduced manufacturing costs, improved product reliability and stability, simplified the manufacturing process, and reduced safety hazards.
Smart Images
Figure CN223743402U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to power equipment, concretely relates to a transformer bushing installation hole stamping structure. BACKGROUND
[0002] For 10kV oil-immersed distribution transformer bushing installation, there are two installation structures in the prior art:
[0003] 1. Without increasing the riser structure. For the structure without increasing the riser, in long-term operation, the tank cover (usually a steel plate welded part) is prone to local deformation and depression of the bushing installation plane due to mechanical stress or thermal deformation, forming a water accumulation area, and water penetration may cause insulation deterioration or internal short circuit, affecting the normal operation of the transformer.
[0004] 2. Increasing the riser structure. For the structure with increased riser, if the riser has defects such as virtual welding and porosity during welding, it is easy to form a water penetration channel at the joint of the riser and the tank cover, which may cause water seepage and other phenomena, leading to transformer failure, and the welding thermal stress may exacerbate the risk of tank cover deformation.
[0005] Both of the above structures have the risk of transformer failure caused by water accumulation or seepage, and the welding process of the increased riser increases the manufacturing cost and process complexity. Therefore, how to solve the problem of water accumulation and seepage in the transformer bushing installation hole has become a research topic in the prior art. SUMMARY
[0006] In view of the water accumulation phenomenon caused by local deformation of the transformer tank cover and the water seepage problem caused by defects in the riser during welding, the utility model provides a transformer bushing installation hole stamping structure, which adopts a new type of bushing installation hole stamping structure to reduce the safety hazards of the transformer, reduce the product cost, improve the product quality, and enhance the market competitiveness of the product.
[0007] To solve the above technical problems, the utility model adopts the technical scheme of a transformer bushing installation hole stamping structure, which comprises a tank cover made of cold-rolled steel plate stamping, a bushing hole is stamped on the tank cover, the bushing hole is in a boss structure, and the installation plane is 3-5mm higher than the tank cover plane.
[0008] A sealing gasket is provided on the boss structure of the bushing hole, and the transformer bushing is pressed against the sealing gasket after passing through the bushing hole.
[0009] The sealing gasket is made of nitrile rubber or fluororubber.
[0010] The tank cover is made of 6mm thick cold-rolled steel plate stamping.
[0011] The utility model discloses a kind of transformer bushing installation hole stamping structure of above-mentioned technical scheme, compared with prior art, under the premise of guaranteeing that transformer long-term stable operation, by optimizing box cover processing technology and installation plane design, the problem of water accumulation, water seepage at box cover bushing is solved, manufacturing cost is reduced and the reliability and stability of product are improved.The utility model does not need to weld elevated seat, structure is simple and excellent in sealing performance, with remarkable practicability, very easy to be accepted and popularized by market. BRIEF DESCRIPTION OF DRAWINGS
[0012] Figure 1 The structure schematic diagram of the utility model is shown;
[0013] Figure 2 The application structure schematic diagram of the utility model is shown. DETAILED DESCRIPTION
[0014] The utility model discloses a kind of transformer bushing installation hole stamping structure, which is specifically described below with reference to the drawings.
[0015] The utility model discloses a kind of transformer bushing installation hole stamping structure, referring to Figure 1 And Figure 2 , including bushing 1, sealing washer 2, box cover 3, oil tank 4, box cover 3 uses the cold-rolled steel sheet with 6mm thickness, directly forms the boss structure of bushing 1 installation hole (bushing hole) on box cover 3 by stamping process, so that bushing installation plane is higher than box cover plane 3-5mm (preferably 4mm), natural drainage, avoid water stagnation. Boss and box cover 3 are integrated structure, without welding additional elevated seat, eliminate welding defect risk. Sealing washer mounting groove is set on boss top plane, sealing washer 2 is embedded in groove, is fixed by interference fit, sealing washer 2 material is butyl nitrile rubber or fluorine rubber material, bushing 1 compresses sealing washer 2, and is used in cooperation with oil tank 4. Sealing washer 3 and boss plane, bushing 1 form airtight interface, prevent oil leakage and external moisture intrusion.
[0016] The utility model discloses because installation hole elevated portion does not exist welding condition, and it is 3-5mm higher than box cover, stamping forming process ensures that boss edge is smooth without burr, reduces sealing washer abrasion, the overall rigidity of box cover is enhanced, and the resistance to deformation ability is superior to traditional welding structure, solve the problem of water accumulation, water seepage at transformer box cover bushing, adopt new type bushing installation hole stamping structure, reduce transformer safety hidden danger, reduce product cost, improve product quality, enhance product market competitiveness in a roundabout way.
Claims
1. A transformer bushing mounting hole punch structure comprising a tank cover, characterized by The box cover is punched by cold-rolled steel plate, and a sleeve hole is punched on the box cover, the sleeve hole is in a boss structure, and the installation plane is 3-5mm higher than the plane of the box cover.
2. The transformer sleeve hole punching structure according to claim 1, characterized in that a sealing gasket is arranged on the boss structure of the sleeve hole, and the sealing gasket is pressed after the transformer sleeve passes through the sleeve hole.
3. A transformer bushing mounting hole stamping structure according to claim 2, characterized in that The sealing gasket is made of butyronitrile rubber or fluorine rubber.
4. A transformer bushing mounting hole stamping structure according to claim 1, characterized in that The box cover is punched by cold-rolled steel plate with a thickness of 6mm.