CN115172013A

CN115172013A - Coil and air duct integrated structure and pouring mold thereof

Info

Publication number: CN115172013A
Application number: CN202210761967.6A
Authority: CN
Inventors: 刘群; 金承祥; 李宁
Original assignee: Clp Jiangsu Transformer Manufacturing Co ltd
Current assignee: Clp Jiangsu Transformer Manufacturing Co ltd
Priority date: 2022-06-30
Filing date: 2022-06-30
Publication date: 2022-10-11

Abstract

The invention discloses a coil and air duct integrated structure and a casting mould thereof, which comprise a transformer high-voltage coil and an air duct integrated with the transformer high-voltage coil, wherein the air duct is positioned at the radial outer layer of the transformer high-voltage coil, a through cavity is arranged at the position of the air duct close to the radial outer layer of the transformer high-voltage coil, and three reinforcing ribs are sequentially arranged on the air duct along the circumferential direction of the transformer high-voltage coil; the cavity is divided into four arc strip-shaped cavities by reinforcing ribs; and a plurality of through waist-shaped air passages are arranged at the position of the high-voltage coil of the transformer, which is close to the radial inner layer. The seamless connection of the air duct on the outer side of the transformer coil is successfully realized, and the mechanical strength of the connection of the air duct and the transformer coil is enhanced. Greatly enhances the three-proofing performance of the product, and particularly can meet the C3 climate grade.

Description

Coil and air duct integrated structure and pouring mold thereof

Technical Field

The invention relates to the technical field of electrical equipment, in particular to a coil and air duct integrated structure and a casting mold thereof.

Background

The dry type transformer refers to a transformer in which an iron core and a winding are not immersed in insulating oil, wherein when the dry type transformer operates, a certain amount of heat is generated, and at this time, the dry type transformer needs to be forcibly cooled to avoid the problem that the service life of the transformer is affected due to overhigh heat.

When the conventional dry-type transformer is in forced cooling operation, the fan arranged on one side of the transformer rotates, so that outside air flow is sucked into the position of the transformer by the fan, and in the process of contacting air with the transformer, the air can take away heat generated by the transformer, thereby completing the forced cooling operation. However, in the prior art, in the heat dissipation of the high-voltage coil of the transformer, insulating support bars (the support bars serve as frameworks for supporting the insulating cylinder) with a certain thickness are uniformly arranged on the outer coil of the transformer in the radial direction, and the upper surfaces of the support bars are wrapped into circular insulating cylinders by insulating materials to form cylindrical air cavities. The heat dissipation structure is complex, difficult to transport, large in assembly consumption man-hour, poor in heat conduction performance, incapable of meeting the requirements of market development, and particularly obvious in problem under the condition of high environmental humidity.

Disclosure of Invention

The invention aims to solve the defects of the prior art, and provides a coil and air duct integrated structure which comprises a transformer high-voltage coil and an air duct integrally formed with the transformer high-voltage coil, wherein the air duct is positioned on the radial outer layer of the transformer high-voltage coil, a through cavity is arranged at the position, close to the radial outer layer of the transformer high-voltage coil, of the air duct, and three reinforcing ribs are sequentially arranged on the air duct along the circumferential direction of the transformer high-voltage coil; the cavity is divided into four arc strip-shaped cavities by reinforcing ribs; and a plurality of through waist-shaped air passages are arranged at the position of the high-voltage coil of the transformer, which is close to the radial inner layer.

In order to improve the feasibility of the structural process; and the mechanical strength of the air duct structure is enhanced. Furthermore, the three reinforcing ribs are distributed along the circumferential direction of the air guide cylinder at 90 degrees, 180 degrees and 270 degrees.

In order to enhance the toughness of the cylinder wall and prevent the thin wall from cracking. Furthermore, a cavity of the air duct is wrapped with glass mesh cloth.

Furthermore, the air duct is wrapped by the glass mesh cloth and then filled with epoxy resin.

In order to further prolong the creepage distance of the coil in and out terminal, the creeping discharge on the surface of the coil is avoided to the maximum extent. Preferably, a plurality of grooves are formed in a boss of the wire inlet and outlet terminal of the high-voltage coil of the transformer.

A pouring mould of a coil and air duct integrated structure comprises an outer mould, an inner mould, a panel, a bottom plate and a plurality of air flue plates, wherein the diameter of the inner wall of the outer mould is the same as that of the outer wall of an air duct, a plurality of holes matched with a cavity of a high-voltage coil of a transformer and a kidney-shaped air flue are formed in the upper end face of the inner mould, a plurality of convex blocks are arranged on one side, facing the high-voltage coil of the transformer, of the panel, and the convex blocks are matched with grooves of bosses of wire inlet and outlet terminals.

Furthermore, a hanging ring is arranged on the upper end face of the inner die.

Furthermore, the lifting ring is connected with the inner die through threads.

Furthermore, the convex block is a steel plate and is fixedly connected with the panel through welding.

The problem that the thin wall of a thin air guide cylinder wall is prone to cracking when a traditional large air duct plate is pulled out after casting and curing is solved. Furthermore, a plurality of closely arranged air channel plates are vertically arranged at the opening of the inner die.

Has the beneficial effects that: compared with the prior art, the coil and air duct integrated structure successfully realizes seamless connection of the air duct outside the transformer coil, and enhances the mechanical strength of connection of the coil and the air duct. The three-proofing performance of the product is greatly enhanced, and particularly the three-proofing performance can meet the C3 climate grade, namely the transformer is suitable for storage at the ambient temperature of minus 45 ℃ and operation at the ambient temperature of minus 25 ℃. Effectively improves the safety and the reliability of the product.

According to the casting mould with the integrated structure of the coil and the air duct, the production efficiency of a product can be greatly improved, the assembly is not needed, the transportation is convenient, the cavity and the waist-shaped air duct are formed directly by pre-embedding the air duct plate in the production process, and the air duct plate can be directly pulled out after the high-voltage coil of the transformer is cast, dried and cured, so that the production cost is effectively reduced.

Drawings

Fig. 1 is a schematic perspective view of an integrated structure of a coil and an air duct according to an embodiment of the present invention;

FIG. 2 is a top view of FIG. 1;

fig. 3 is a schematic perspective view of a casting mold with an integrated structure of a coil and an air duct according to an embodiment of the present invention;

fig. 4 is a schematic perspective view of a face plate of a casting mold according to an embodiment of the present invention;

in the figure: 1. the transformer high-voltage coil comprises a transformer high-voltage coil body 2, an air duct 3, a cavity 4, reinforcing ribs 5, a waist-shaped air passage 6, a groove 7, an outer mold 8, an inner mold 9, a panel 10, a bottom plate 11, a bump 12 and a hanging ring.

Detailed Description

For the purpose of enhancing the understanding of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.

Referring to fig. 1 and 2, a coil and air duct integrated structure includes a transformer high-voltage coil 1 and an air duct 2 integrally formed with the transformer high-voltage coil, the air duct 2 is located at a radial outer layer of the transformer high-voltage coil, a through cavity 3 is disposed at a position of the air duct 2 close to the radial outer layer of the transformer high-voltage coil, and three reinforcing ribs 4 are sequentially disposed on the air duct 2 along a circumferential direction of the transformer high-voltage coil 1; the cavity 3 is divided into four arc strip-shaped cavities by reinforcing ribs 4; and a plurality of through waist-shaped air passages 5 are arranged at the position of the transformer high-voltage coil 1 close to the radial inner layer.

In the present embodiment, the three reinforcing ribs 4 are distributed along 90 °, 180 °, and 270 ° of the circumferential direction of the air duct 2. The feasibility of the structure process can be improved; the mechanical strength of the air duct structure can be enhanced.

In this embodiment, the cavity 3 of the air duct 2 is wrapped with a glass mesh cloth (not shown). The air duct 2 is wrapped by glass mesh cloth and then filled with epoxy resin (not shown in the figure). Effectively enhances the toughness of the cylinder wall and prevents the thin wall from cracking.

Furthermore, a plurality of grooves 6 are arranged on the bosses of the wire inlet and outlet terminals of the high-voltage coil 1 of the transformer. The groove structure can further prolong the creepage distance of the coil wire inlet and outlet terminal, and avoid creeping discharge on the surface of the coil to the maximum extent.

Referring to fig. 3, a casting mold of a coil and air duct integrated structure includes an outer mold 7, an inner mold 8, a panel 9, a bottom plate 10 and a plurality of air duct plates, wherein the diameter of the inner wall of the outer mold 8 is the same as the diameter of the outer wall of the air duct 2, and a plurality of openings matched with the cavity 3 and the waist-shaped air duct 6 of the transformer high-voltage coil 1 are formed on the upper end surface of the inner mold 8. And a lifting ring 12 is arranged on the upper end surface of the inner die 8. The lifting ring can facilitate the lifting of the whole mould. The lifting ring 12 is connected with the inner die through threads.

Referring to fig. 4, a plurality of protrusions 11 are disposed on one side of the panel 9 facing the high voltage coil of the transformer, and the protrusions 11 are matched with the grooves 6 of the bosses of the incoming and outgoing terminals. The convex block 11 is a steel plate and is fixedly connected with the panel through welding.

Considering that when the traditional large air duct plate is pulled out after casting and curing, the problem of thin wall cracking of the thinner air guide cylinder wall is easily caused, in the embodiment, a plurality of air duct plates which are closely arranged are vertically arranged at the opening of the inner die. The air duct plates which are closely arranged can reduce the damage to the air duct to the minimum when being pulled out.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.

Claims

1. A coil and air duct integrated structure is characterized by comprising a transformer high-voltage coil and an air duct integrally formed with the transformer high-voltage coil, wherein the air duct is positioned on the radial outer layer of the transformer high-voltage coil, a through cavity is arranged at the position, close to the radial outer layer of the transformer high-voltage coil, of the air duct, and three reinforcing ribs are sequentially arranged on the air duct along the circumferential direction of the transformer high-voltage coil; the cavity is divided into four arc strip-shaped cavities by reinforcing ribs; and a plurality of through waist-shaped air passages are arranged at the position of the high-voltage coil of the transformer, which is close to the radial inner layer.

2. The integrated structure of the coil and the air duct as claimed in claim 1, wherein the three reinforcing ribs are distributed along 90 °, 180 ° and 270 ° of the circumferential direction of the air duct.

3. The integrated structure of the coil and the air duct as claimed in claim 1, wherein a glass mesh cloth is wrapped in the cavity of the air duct.

4. The integrated structure of the coil and the air duct as claimed in claim 3, wherein the air duct is wrapped with glass mesh cloth and then filled with epoxy resin.

5. The integrated structure of the coil and the air duct as claimed in claim 1, wherein the inlet and outlet terminal bosses of the high-voltage coil of the transformer are provided with a plurality of grooves.

6. The pouring die with the integrated structure of the coil and the air duct is characterized by comprising an outer die, an inner die, a panel, a bottom plate and a plurality of air duct plates, wherein the diameter of the inner wall of the outer die is the same as that of the outer wall of the air duct, a plurality of openings matched with a cavity of a high-voltage coil of a transformer and a kidney-shaped air duct are formed in the upper end face of the inner die, a plurality of convex blocks are arranged on one side, facing the high-voltage coil of the transformer, of the panel, and the convex blocks are matched with grooves of bosses of wire inlet and outlet terminals.

7. The casting mold of claim 6, wherein a hanging ring is mounted on the upper end surface of the inner mold.

8. The casting mold of claim 7, wherein the hanging ring is connected to the inner mold by a screw thread.

9. The casting mold of claim 6, wherein the protrusion is a steel plate and is fixedly connected to the panel by welding.

10. The casting mold of claim 6, wherein the openings of the inner mold are vertically provided with a plurality of closely arranged air duct plates.