Cabinet cover upper cover of metal corrugated oil conservator for transformer

Abstract

The utility model belongs to the technical field of oil conservator covers, and particularly relates to a cabinet cover upper cover of a metal corrugated oil conservator for a transformer, the cabinet cover upper cover is provided with an upper cover body and convex ribs, the upper cover body is in an arch shape formed by stretching, and a plurality of convex ribs for improving the compression resistance and torsion resistance of the cabinet cover upper cover are arranged on the upper surface of the upper cover body. The convex ribs and the upper cover body are integrally pressed and formed; bolt holes used for being connected with a cabinet cover surrounding plate are formed in the bottom of the upper cover body in the circumferential direction. According to the utility model, the structure of the cabinet cover is simplified, the manufacturing cost is reduced, and the production efficiency is improved; compared with a traditional welding type metal corrugated oil conservator cover upper cover, the punch-formed cabinet cover upper cover structure has the advantages that the structure is simplified, the self weight is reduced, the cost is reduced, the production efficiency is improved, and the consistency and interchangeability of products are improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of oil tank cover technology, specifically a metal corrugated oil tank cover for transformers. Background Technology

[0002] Traditional transformers use internal oil-filled corrugated metal conservators, which are structurally divided into two main parts: the expansion core and the external structure. The external structure generally consists of a cover and a base, with the cover serving to protect the expansion core and for decorative purposes. To achieve better protection and the ability to withstand wind and snow loads, the cover is usually divided into a top cover and a surrounding panel. The top cover has an arched shape in the middle and is made of cold-worked metal sheet welded with reinforcing structures, serving to guide rain and snow. The surrounding panel is a thin-plate welded structure, and its height is designed according to specific requirements.

[0003] like Figure 1 As shown, the cover of a traditional welded corrugated metal oil tank is made of an arched middle cover 1, two hemispherical side covers 2, several inner arched ribs 3, and one inner annular rib 4, all welded together. The inner arched ribs 3 and the inner annular rib 4 serve to strengthen the cover and enhance its resistance to pressure and torsion.

[0004] With the advancement of basic industries, the traditional cabinet cover structure has become too complex to handle, limiting the development of the metal corrugated oil storage tank industry. Its main shortcomings are as follows:

[0005] First, because the traditional cabinet cover uses a welded assembly structure, the whole piece is often composed of dozens of parts, making the production process more complex and the processing cost higher.

[0006] Secondly, since the main components of traditional cabinet covers are large-sized thin metal sheets, in order to ensure the shape and protective function, they are often designed with relatively complex reinforcement structures, using a lot of materials, and the material cost is relatively high.

[0007] Third, because the traditional cabinet cover uses a welding process, it is difficult to control the size, and the welded finished products often have large errors. The cabinet cover panel that is used to form the cabinet cover needs to be welded to it, which results in poor consistency of the overall cabinet cover, which limits the versatility of the cabinet cover and also limits the modular design of the metal corrugated oil storage tank cover.

[0008] Therefore, a more reasonable structure for the metal corrugated oil tank cover has become a requirement for oil tank manufacturers.

[0009] With the advancement of basic industries, large-scale processing equipment has gradually become more widespread. For example, stamping processes are now widely used for parts such as automobile chassis that have dimensions similar to the top cover of a corrugated metal oil tank. It is now feasible to use stamping processes to manufacture the top cover of a corrugated metal oil tank. Utility Model Content

[0010] In view of the above-mentioned problems of the traditional metal corrugated oil tank cover, the purpose of this utility model is to provide a metal corrugated oil tank cover for transformers.

[0011] The objective of this utility model is achieved through the following technical solution:

[0012] The cabinet cover of this utility model has an upper cover body and ribs. The upper cover body is an arched shape formed by stretching. Multiple ribs are provided on the upper surface of the upper cover body to improve the pressure and torsion resistance of the cabinet cover. The ribs are integrally pressed and formed with the upper cover body. Bolt holes for connecting with the cabinet cover panel are opened circumferentially at the bottom of the upper cover body.

[0013] Wherein: the cabinet cover is formed by pressing a thin metal plate with a hydraulic press.

[0014] The upper cover is elliptical or rectangular with arc-shaped ends. A rib is provided at the middle position of both ends of the upper cover along the length direction, and one or more ribs are provided between the ribs at both ends along the width direction of the upper cover.

[0015] The two ends of the ribs arranged along the width direction of the upper cover extend to both sides of the length direction of the upper cover. One end of the ribs arranged along the length direction of the upper cover is located at the end of the length direction of the upper cover, and the other end of the ribs arranged along the length direction of the upper cover extends to the ribs arranged along the width direction of the upper cover.

[0016] The cabinet enclosure includes semi-circular enclosures at both ends and two straight enclosures located between the two semi-circular enclosures. The semi-circular enclosures and the straight enclosures are connected by bolts, and the tops of the semi-circular enclosures and the straight enclosures are respectively connected to bolt holes on the upper cover by bolts.

[0017] The advantages and positive effects of this utility model are as follows:

[0018] This utility model employs a cold-working process, primarily stamping, to manufacture the cabinet cover. By utilizing finite element analysis to design and simplify the manufacturing process, the corrugated metal oil storage tank cover is made easier to produce, reducing manufacturing costs, shortening the production cycle, and promoting industry development. Specifically:

[0019] 1. Simplified structure: This utility model adopts a stamped metal corrugated oil tank cover instead of the traditional welded metal corrugated oil tank cover, and uses stamped ribs instead of the original welded reinforcing ribs, which greatly simplifies the structure of the metal corrugated oil tank cover.

[0020] 2. Manufacturing Cost and Cycle: This utility model uses stamping to manufacture the metal corrugated oil storage tank cover, combined with laser-processed positioning holes; it uses cold forming technology instead of hot forming technology, and laser cutting technology instead of milling and drilling technology, and applies automated equipment, which significantly shortens the production cycle and reduces processing costs. Simultaneously, due to the simplified structure, the amount of raw materials used is reduced, resulting in lower material costs. In actual production, the metal corrugated oil storage tank cover is treated as a general-purpose component, while the metal corrugated oil storage tank cover panels are defined as customized components. The general-purpose metal corrugated oil storage tank cover can be mass-produced and stocked, eliminating the need to consider the production cycle and greatly improving production efficiency. The customized tank cover panels can be designed and manufactured in a serialized and modular manner according to actual needs. Because the metal corrugated oil storage tank cover has excellent consistency and can be interchanged, the manufacturing cost of the metal corrugated oil storage tank cover using this utility model is significantly lower than that of traditional welded tank covers, and the production cycle is also significantly shortened. This, to a certain extent, promotes the development of the industry.

[0021] 3. Extended lifespan: The connection between the stamped metal corrugated oil tank cover and the tank enclosure panel of this utility model is changed to a bolt connection; the bolt holes of the tank enclosure panel are made with laser processing technology, resulting in high product consistency and interchangeability. When the metal corrugated oil tank cover or enclosure panel is damaged or needs to be replaced, only the damaged part can be replaced instead of the whole set, thereby extending the service life of the entire oil tank. Attached Figure Description

[0022] Figure 1 A schematic diagram of the structure of the cover of a traditional welded corrugated metal oil tanker.

[0023] Figure 2 This is a schematic diagram of the structure of this utility model;

[0024] Figure 3 This is a schematic diagram of the cabinet cover structure composed of the present invention and the cabinet cover panel;

[0025] Among them: 1 is the arched middle cover, 2 is the hemispherical side cover, 3 is the inner arched rib, 4 is the inner ring rib, 5 is the upper cover body, 6 is the convex rib, 7 is the bolt hole, 8 is the stamped upper cover, 9 is the semi-circular surrounding plate, and 10 is the straight surrounding plate. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings.

[0027] like Figure 2 , Figure 3As shown, the cabinet cover 8 of this utility model has an upper cover body 5 and multiple ribs 6. The upper cover body 5 is stretched and multiple ribs 6 are arranged on the upper surface of the upper cover body 5. The ribs 6 and the upper cover body 5 form an integral structure. The ribs 6 increase the local moment of inertia of the cabinet cover 8, thereby improving the overall compressive and torsional resistance of the cabinet cover 8.

[0028] In this embodiment, the cabinet cover 8 is made of thin metal sheet with a thickness of 1 to 3 mm. It is formed by hydraulic press, and each rib 6 is integrally pressed with the cover body 5.

[0029] In this embodiment, the upper cover 5 is arched, and each rib 6 conforms to the shape of the arched upper cover 5, thereby improving the structural strength and rigidity. Multiple bolt holes 7 are machined circumferentially at the bottom of the upper cover 5 using laser cutting technology for bolt connection with the cabinet enclosure panel, ensuring the accuracy of the bolt hole positions.

[0030] The upper cover 5 is elliptical or rectangular with arc-shaped ends. In this embodiment, the upper cover 5 is rectangular with arc-shaped ends. A raised rib 6 is provided at the midpoint of both ends of the upper cover 5 along its length. One or more (three in this embodiment) raised ribs 6 are provided between the two raised ribs 6 along the width direction of the upper cover 5. The two ends of the raised ribs 6 along the width direction of the upper cover 5 extend to both sides of the upper cover 5 along its length direction. One end of the raised rib 6 along the length direction of the upper cover 5 is located at the end of the upper cover 5 along its length direction, and the other end extends to the outermost raised rib 6 along the width direction of the upper cover 5.

[0031] The cabinet enclosure panel of this embodiment includes two semi-circular enclosure panels 9 at both ends and two straight enclosure panels 10 located between the two semi-circular enclosure panels 9. The semi-circular enclosure panels 9 and the straight enclosure panels 10 are connected by bolts, and the tops of the semi-circular enclosure panels 9 and the straight enclosure panels 10 are respectively connected to the bolt holes 7 on the upper cover 5 by bolts, thereby forming a metal corrugated oil storage tank enclosure.

[0032] In the actual manufacturing process, the cabinet cover 8 is made using a two-stage laser cutting and one-stage stamping process. Specifically: during the first laser cutting, only the rough shape and the surrounding bolt holes 7 are cut, and the stamping operation is performed using the shape as a positioning reference. After stamping, during the second laser cutting, the excess edges are trimmed using the bolt holes 7 as a positioning reference. After the cabinet cover 8 is completed, according to the requirements, the required semi-circular surrounding plates 9 and straight surrounding plates 10 are selected and connected by bolts, and then connected to the cabinet cover 8 with bolts to form the required corrugated metal oil storage tank cover.

[0033] This invention employs a cold-working process, primarily stamping, to replace the hot-working welding process in manufacturing the top cover of a corrugated metal oil storage tank. By optimizing the design of the traditional welded corrugated metal oil storage tank top cover, and using raised ribs (6) to improve the performance of the single-plate structure, the design is verified using finite element analysis (existing technology), ensuring that the performance of the new structure surpasses that of the traditional welded corrugated metal oil storage tank cover. During manufacturing, a repeated positioning method based on the same reference is used, along with CNC machining equipment and large-scale stamping equipment, to improve structural precision.

Claims

1. A cover for a tank cover of a metal bellows oil conservator for a transformer, characterized by: The cabinet cover upper cover (8) has an upper cover body (5) and a convex rib (6), the upper cover body (5) is an arch-shaped stretch, a plurality of convex ribs (6) for improving the compression and torsion resistance of the cabinet cover upper cover (8) are arranged on the upper surface of the upper cover body (5), and the convex ribs (6) are integrally formed with the upper cover body (5) by pressing.

2. The cover of the tank cover of the metal bellows oil conservator for transformer according to claim 1, characterized in that: The cabinet cover upper cover (8) is formed by pressing a thin metal plate by an oil press.

3. The cover of the tank cover of the metal bellows oil conservator for transformer according to claim 1, characterized in that: The upper cover body (5) is an oval or a rectangular with arc-shaped two ends, convex ribs (6) are arranged at the middle positions of the two ends of the upper cover body (5) along the length direction, and one or more convex ribs (6) are arranged along the width direction of the upper cover body (5) between the two ends of the convex ribs (6).

4. The cover of the tank cover of the metal bellows oil conservator for transformer according to claim 3, characterized in that: The two ends of the convex rib (6) arranged along the width direction of the upper cover body (5) respectively extend to the two sides of the length direction of the upper cover body (5), one end of the convex rib (6) arranged along the length direction of the upper cover body (5) is located at the end of the length direction of the upper cover body (5), and the other end of the convex rib (6) arranged along the length direction of the upper cover body (5) extends to the convex rib (6) arranged along the width direction of the upper cover body (5).

5. The cover of the tank cover of the metal bellows oil conservator for transformer according to claim 1, characterized in that: The cabinet cover surrounding plate includes two semicircular surrounding plates (9) at two ends and two straight surrounding plates (10) between the two semicircular surrounding plates (9), the semicircular surrounding plates (9) and the straight surrounding plates (10) are connected by bolts, and the top portions of the semicircular surrounding plates (9) and the straight surrounding plates (10) are connected with the bolt holes (7) on the upper cover body (5) by bolts.

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