Transformer coil winding die of energy-saving intelligent box-type substation

Abstract

The invention discloses a transformer coil winding die for an energy-saving intelligent box-type substation, which comprises a waist-shaped tubular die body, a front limiting plate sleeved on the outer side surface of the front end of the die body and a rear limiting plate sleeved on the outer side surface of the rear end of the die body, and is characterized in that the die body is formed by bending a steel spring plate with L-shaped bending parts at two ends; a rectangular notch is formed between the L-shaped bending parts at the two ends after the spring steel plate is bent; the transformer coil winding die further comprises clamping strips and air duct forming strips, the clamping strips are embedded into the rectangular notches so that the front limiting plate and the rear limiting plate can be tightly arranged at the two ends of the die body in a sleeved mode, and the air duct forming strips are inserted into the rectangular holes in the front limiting plate and the rear limiting plate in a penetrating mode. According to the invention, the pluggable air duct forming strips are arranged on the front limiting plate and the rear limiting plate, in the coil winding process, the air duct forming strips are integrally wound in the coil, the air duct forming strips are pulled out after insulating resin is poured into the coil, and a heat dissipation ventilation duct is formed in the coil, so that the heat dissipation performance of the coil can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer production, in particular to a winding die for a transformer coil. Background Art

[0002] The coil of a dry-type transformer is made by winding a copper busbar (or copper wire) and an insulation layer on a mold, then pouring insulating resin. Dry-type transformer coils are cooled by natural or forced air. For large-capacity dry-type transformers, the coils and core generate significant heat. If the coil temperature exceeds the tolerance of the insulation layer and the insulating resin, it can cause the insulation material to age, carbonize, or even fail, leading to short circuits or burnout. Existing transformer coil winding molds have an elliptical structure. After pouring the insulating resin, the coils wound on them lack internal heat dissipation structures, which hinders ventilation and heat dissipation of the dry-type transformer coils. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a transformer coil winding mold to solve the technical problem that the coil wound by the existing transformer coil winding mold has no ventilation and heat dissipation structure inside, which is not conducive to the heat dissipation of the coil.

[0004] The transformer coil winding mold of the present invention comprises a waist-shaped tubular mold body, a front limit plate sleeved on the outer surface of the front end of the mold body, and a rear limit plate sleeved on the outer surface of the rear end of the mold body. The mold body is formed by bending a spring steel plate with L-shaped bends at both ends, and a rectangular notch is formed between the L-shaped bends at both ends of the spring steel plate after bending.

[0005] The transformer coil winding mold further includes a clamping strip, which is embedded in the rectangular notch so that the front limit plate and the rear limit plate are tightly fitted on both ends of the mold body;

[0006] The front limit plate and the rear limit plate are provided with rectangular holes evenly distributed along the circumferential direction;

[0007] The transformer coil winding mold further includes an air duct forming strip, which is used to penetrate and be inserted into the rectangular holes on the front limiting plate and the rear limiting plate.

[0008] Furthermore, the transformer coil winding mold also includes a front positioning support plate adapted to the waist-shaped inner hole at the front end of the mold body, a front clamping plate fixed on the front positioning support plate and abutting against the front end surface of the mold body, a rear positioning support plate adapted to the waist-shaped inner hole at the rear end of the mold body, and a rear clamping plate fixed on the rear positioning support plate and abutting against the rear end surface of the mold body, a square shaft hole is provided in the middle of the front positioning support plate and the rear positioning support plate, and the front positioning support plate and the rear positioning support plate are connected by a bolt and nut assembly.

[0009] Furthermore, the transformer coil winding mold also includes a clamp for assisting in fixing the clamping strip, the clamp including a left clamping block, a right clamping block, a bolt and a nut, the lower end of the left clamping block is fixedly connected to a guide rod that slides with the lower end of the right clamping block, the bolt passes through the middle of the left clamping block and the right clamping block, the nut is connected to the bolt and applies thrust to the left clamping block.

[0010] Beneficial effects of the present invention:

[0011] 1. The transformer coil winding mold of the present invention provides pluggable air duct forming strips on the front and rear limit plates. During the coil winding process, the air duct forming strips are integrally wound in the coil. After the coil is poured with insulating resin, the air duct forming strips are pulled out, forming a heat dissipation ventilation duct in the coil, thereby improving the heat dissipation performance of the coil.

[0012] 2. In the transformer coil winding mold of the present invention, after the card strip is knocked off from the rectangular notch on the mold body, the mold body undergoes elastic contraction, and the mold body is loosened from the front limit plates and the rear limit plates at both ends. In this way, the mold body, the front limit plates and the rear limit plates can be removed, and the coil is easily demolded; at the same time, the disassembly and assembly of the entire mold is also simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the three-dimensional structure of the coil winding mold without the air duct forming strip installed;

[0014] Figure 2 This is a schematic diagram of the three-dimensional structure of the coil winding mold after the positioning support plate is removed;

[0015] Figure 3 This is a schematic diagram of the front three-dimensional structure of the coil winding mold after the air duct forming strip is installed;

[0016] Figure 4 This is a schematic diagram of the three-dimensional structure of the rear side of the coil winding mold after the air duct forming strip is installed. DETAILED DESCRIPTION

[0017] The present invention will be further described below with reference to the accompanying drawings and examples.

[0018] As shown in the figure, the transformer coil winding mold of this embodiment includes a waist-shaped tubular mold body 1, a front limit plate 2 sleeved on the outer surface of the front end of the mold body, and a rear limit plate 3 sleeved on the outer surface of the rear end of the mold body. The mold body is formed by bending a spring steel plate with L-shaped bends 4 at both ends, and a rectangular notch is formed between the L-shaped bends at both ends of the spring steel plate after bending.

[0019] The transformer coil winding mold further comprises a clamping strip 5, which is embedded in the rectangular notch to elastically expand the mold body, thereby making the front limit plate and the rear limit plate tightly fit on both ends of the mold body.

[0020] The front limit plate and the rear limit plate are provided with rectangular holes 6 evenly distributed along the circumferential direction.

[0021] The transformer coil winding mold further includes an air duct forming strip 7 , which is used to penetrate and be inserted into the rectangular holes 6 on the front limiting plate and the rear limiting plate.

[0022] The transformer coil winding mold described in this embodiment also includes a front positioning support plate 8 adapted to the waist-shaped inner hole at the front end of the mold body, a front clamping plate 9 fixed on the front positioning support plate and abutting against the front end surface of the mold body, a rear positioning support plate 10 adapted to the waist-shaped inner hole at the rear end of the mold body, and a rear clamping plate 11 fixed on the rear positioning support plate and abutting against the rear end surface of the mold body. A square shaft hole 12 is provided in the middle of the front positioning support plate and the rear positioning support plate, and the front positioning support plate and the rear positioning support plate are connected by a bolt and nut assembly 13.

[0023] The transformer coil winding mold of this embodiment is assembled as follows:

[0024] First, insert the front limit plate 2 and the rear limit plate 3 into the two ends of the mold body 1, and then knock the clamping strip 5 into the rectangular notch on the mold body 1, so that the front limit plate 2 and the rear limit plate 3 are tightly fitted on both ends of the mold body. Then, respectively install the front positioning support plate 8 and the rear positioning support plate 10 into the waist-shaped inner holes at both ends of the mold body 1. Finally, tighten and secure the front positioning support plate 8 and the rear positioning support plate 10 with the bolt and nut assembly 13. After tightening and securing, the front clamping plate 9 and the rear clamping plate 11 are pressed and fixed to the two end surfaces of the mold body 1. In this way, the coil winding mold is assembled into a whole.

[0025] To wind the coil, the assembled mold is mounted on the winding machine's rectangular shaft through the square shaft hole 12, and the coil is then wound. Once the coil is wound to the desired size, the duct forming strip 7 is inserted into the rectangular hole 6, and the coil winding process continues. After the coil is wound, insulating resin is poured into the coil. After the pouring is complete, the duct forming strip 7 is removed, creating a heat dissipation duct within the coil, significantly improving the coil's heat dissipation performance.

[0026] As an improvement to the above embodiment, the transformer coil winding mold further includes a clamp for assisting in fixing the clamping strip 5, the clamp including a left clamp 14, a right clamp 15, a bolt 16 and a nut 17. The lower end of the left clamp is fixedly connected to a guide rod 18 that slides with the lower end of the right clamp. The bolt passes through the middle of the left and right clamps. The nut is connected to the bolt and applies a thrust to the left clamp. The clamp applies a clamping force to the L-shaped bend 4, thereby further improving the reliability of fixing the clamping strip 5 and better avoiding the problem of the clamping strip loosening during the coil winding process. In a specific implementation, a pad 19 can also be provided between the outer side of the L-shaped bend 4 and the left and right clamps 14, 15, so that the L-shaped bend 4 is subjected to uniform force along the entire length direction, thereby avoiding local deformation of the L-shaped bend 4.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. Transformer coil winding mold, characterized by: The mold body comprises a waist-shaped tubular mold body, a front limit plate sleeved on the outer surface of the front end of the mold body, and a rear limit plate sleeved on the outer surface of the rear end of the mold body. The mold body is formed by bending a spring steel plate with L-shaped bends at both ends, and a rectangular notch is formed between the L-shaped bends at both ends of the spring steel plate after bending. The transformer coil winding mold further includes a clamping strip, which is embedded in the rectangular notch so that the front limit plate and the rear limit plate are tightly fitted on both ends of the mold body; The front limit plate and the rear limit plate are provided with rectangular holes evenly distributed along the circumferential direction; The transformer coil winding mold further includes an air duct forming strip, which is used to penetrate and be inserted into the rectangular holes on the front limiting plate and the rear limiting plate.

2. The transformer coil winding mold according to claim 1, characterized in that: It also includes a front positioning support plate adapted to the waist-shaped inner hole at the front end of the mold body, a front clamping plate fixed on the front positioning support plate and abutting against the front end surface of the mold body, a rear positioning support plate adapted to the waist-shaped inner hole at the rear end of the mold body, and a rear clamping plate fixed on the rear positioning support plate and abutting against the rear end surface of the mold body. A square shaft hole is provided in the middle of the front positioning support plate and the rear positioning support plate, and the front positioning support plate and the rear positioning support plate are connected by a bolt and nut assembly.

3. The transformer coil winding mold according to claim 1, characterized in that: It also includes a clamp for assisting in fixing the clip strip, the clamp including a left clamp block, a right clamp block, a bolt and a nut, the lower end of the left clamp block is fixedly connected to a guide rod that slides with the lower end of the right clamp block, the bolt passes through the middle of the left clamp block and the right clamp block, the nut is connected to the bolt and applies thrust to the left clamp block.

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