Dry-type transformer coil panel and forming die thereof

Abstract

The embodiment of the utility model discloses a dry-type transformer coil panel and a forming die thereof, the panel comprises a transverse gridding cloth assembly, tubular gridding cloth and longitudinal gridding cloth, the transverse gridding cloth assembly is formed by stacking a plurality of transverse gridding cloth in sequence, the transverse gridding cloth is provided with terminal positioning holes and longitudinal positioning holes, and the tubular gridding cloth and the longitudinal gridding cloth are arranged in a staggered mode. The terminal positioning holes and the longitudinal positioning holes of the plurality of transverse gridding cloth are respectively stacked to form a terminal positioning groove and a longitudinal positioning groove, the tubular gridding cloth is arranged in the terminal positioning groove, and the longitudinal gridding cloth is arranged in the longitudinal positioning groove; insulating paint layers are arranged on the surface of the transverse gridding cloth assembly, between the tubular gridding cloth and the groove wall of the terminal positioning groove and between the longitudinal gridding cloth and the groove wall of the longitudinal positioning groove. The transverse gridding cloth, the tubular gridding cloth and the longitudinal gridding cloth are in a gridding shape, and insulating paint is filled between the gridding. According to the utility model, the anti-cracking capability of the panel and the terminals can be improved, and the service life of the product is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, in particular to a dry-type transformer coil panel and a forming die thereof. Background Technique

[0002] After the dry-type transformer coil is wound, the coil needs to be molded and subjected to epoxy resin casting treatment to improve the insulation and mechanical properties of the transformer and enhance the seismic resistance of the transformer. In some dry-type transformers with cast coils, cracks may appear at the coil end plates and terminals in extremely harsh weather. As the transformer operates, the insulation at the cracked areas will age prematurely, which may cause safety accidents. Summary of the Utility Model

[0003] The technical problem to be solved by the embodiments of the utility model is to provide a dry-type transformer coil panel and a forming die thereof to prevent cracks from appearing at the panel and terminals.

[0004] To solve the above technical problem, the embodiments of the utility model propose a dry-type transformer coil panel, which includes a transverse grid cloth assembly, a tubular grid cloth, and a longitudinal grid cloth. The transverse grid cloth assembly is formed by stacking a plurality of transverse grid cloths in sequence. Terminal positioning holes and longitudinal positioning holes are formed on each of the transverse grid cloths. The terminal positioning holes and longitudinal positioning holes of the plurality of transverse grid cloths are stacked respectively to form a terminal positioning groove and a longitudinal positioning groove. The tubular grid cloth is arranged in the terminal positioning groove, and the longitudinal grid cloth is arranged in the longitudinal positioning groove. Insulating paint layers are provided between the surface of the transverse grid cloth assembly, between the tubular grid cloth and the wall of the terminal positioning groove, and between the longitudinal grid cloth and the wall of the longitudinal positioning groove. The transverse grid cloth, the tubular grid cloth, and the longitudinal grid cloth are grid-shaped and the grids are filled with insulating paint.

[0005] Further, the longitudinal positioning hole is a square hole, the transverse grid cloth assembly is cuboid-shaped, and the longitudinal grid cloth is square.

[0006] Further, the insulating paint layer is an epoxy resin layer.

[0007] Further, the transverse grid cloth, the tubular grid cloth, and the longitudinal grid cloth are all epoxy glass grid cloths.

[0008] Further, there are multiple longitudinal positioning holes and multiple terminal positioning holes on the transverse grid cloth.

[0009] Further, the height of the longitudinal grid cloth is equal to the thickness of the transverse grid cloth assembly, and the height of the tubular grid cloth is greater than the thickness of the transverse grid cloth assembly.

[0010] Accordingly, the embodiment of the present utility model further provides a forming die for a dry-type transformer coil panel, which includes a bottom die and a die cover. The bottom die is provided with a forming cavity corresponding to and matching the dry-type transformer coil panel. A plurality of glue inlet through holes are provided on the side wall and bottom of the forming cavity. The bottom of the die cover is recessed with a positioning die cavity corresponding to the tubular mesh cloth, and screw positioning holes are provided at the edge of the die cover.

[0011] Furthermore, a positioning pin corresponding to the middle part of the tubular mesh cloth is provided in the positioning die cavity.

[0012] Furthermore, a handle is provided on the side surface of the bottom die.

[0013] The beneficial effects of the present utility model are as follows: The present utility model improves the production efficiency and can be applicable to all dry-type casting coils; the present utility model can improve the anti-cracking ability of the panel and terminals and ensure the service life of the product; the present utility model is convenient for users to produce. Description of the Drawings

[0014] Figure 1 is a three-dimensional structure diagram of the horizontal mesh cloth in the embodiment of the present utility model.

[0015] Figure 2 is a three-dimensional structure diagram of the dry-type transformer coil panel in the embodiment of the present utility model.

[0016] Figure 3 is a three-dimensional structure diagram of the tubular mesh cloth in the embodiment of the present utility model.

[0017] Figure 4 is a three-dimensional structure diagram of the longitudinal mesh cloth in the embodiment of the present utility model.

[0018] Figure 5 is a three-dimensional structure diagram when the dry-type transformer coil panel in the embodiment of the present utility model is placed in the bottom die.

[0019] Figure 6 is a three-dimensional structure diagram of the assembly in the embodiment of the present utility model.

[0020] Figure 7 is a three-dimensional structure diagram of the die cover in the embodiment of the present utility model.

[0021] Figure 8 is a three-dimensional structure diagram of the bottom die in the embodiment of the present utility model.

[0022] Figure 9 is a three-dimensional structure diagram of the positioning pin in the embodiment of the present utility model.

[0023] Description of the Reference Numerals in the Drawings

[0024] Horizontal grid cloth 1, tubular grid cloth 2, vertical grid cloth 3, terminal positioning holes 4, longitudinal positioning holes 5, bottom mold 6, glue inlet through holes 7, handle 8, mold cover 9, positioning mold cavity 10, positioning pins 11, screws 12, screw positioning holes 13. Detailed implementation manners

[0025] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0026] In the embodiments of the present utility model, if there are directional indications (such as up, down, left, right, front, back...), they are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture (as shown in the drawings). If this specific posture changes, the directional indications will also change accordingly.

[0027] In addition, in the present utility model, the descriptions such as "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature.

[0028] Please refer to Figures 1 to 4 , the dry-type transformer coil panel in the embodiments of the present utility model includes a horizontal grid cloth assembly, a tubular grid cloth, and a vertical grid cloth.

[0029] The horizontal grid cloth assembly is formed by stacking several pieces of horizontal grid cloth in sequence. Terminal positioning holes and longitudinal positioning holes are provided on each horizontal grid cloth, and the terminal positioning holes and longitudinal positioning holes of several horizontal grid cloths are stacked respectively to form a terminal positioning groove and a longitudinal positioning groove.

[0030] The tubular grid cloth is arranged in the terminal positioning groove. In the present utility model, the tubular grid cloth is also used for casting and reinforcement at the terminal to improve the anti-cracking ability. The vertical grid cloth is arranged in the longitudinal positioning groove.

[0031] Insulating paint layers are provided on the surface of the horizontal grid cloth assembly, the outer surface of the tubular grid cloth, between the tubular grid cloth and the groove wall of the terminal positioning groove, and between the vertical grid cloth and the groove wall of the longitudinal positioning groove. The horizontal grid cloth, the tubular grid cloth, and the vertical grid cloth are grid-shaped and insulating paint is filled between the grids. The uniform distribution structure of the grids of the horizontal grid cloth assembly, the tubular grid cloth, and the vertical grid cloth can improve the anti-splitting ability.

[0032] The present utility model is convenient for mass production, saves time, improves production efficiency, and can be applicable to different types of coils.

[0033] As an implementation manner, the longitudinal positioning holes are square holes, the transverse grid cloth assembly is cuboid-shaped, and the longitudinal grid cloth is square.

[0034] As an implementation manner, the insulating paint layer is an epoxy resin layer. The transverse grid cloth, the tubular grid cloth, and the longitudinal grid cloth are all epoxy glass grid cloths. The epoxy glass grid cloth is firmly bonded with the cast epoxy resin. Just like the steel bar framework in concrete, it can prevent the panel of the casting from cracking due to thermal and cold effects and the huge electrodynamic force during the sudden short circuit of the coil, greatly improving the overall mechanical strength of the coil.

[0035] As an implementation manner, there are multiple longitudinal positioning holes and multiple terminal positioning holes on the transverse grid cloth.

[0036] As an implementation manner, the height of the longitudinal grid cloth is equal to the thickness of the transverse grid cloth assembly, and the height of the tubular grid cloth is greater than the thickness of the transverse grid cloth assembly, which can better protect the terminals.

[0037] The preparation method of the dry-type transformer coil panel in the embodiment of the present utility model includes Step 1 to Step 4.

[0038] Step 1: Prepare the tubular grid cloth, the longitudinal grid cloth, and several transverse grid cloths, and prepare a forming mold. Please refer to Figures 5 to 9 , the forming mold of the dry-type transformer coil panel includes a bottom mold and a mold cover. The bottom mold is provided with a forming cavity corresponding to and matching the dry-type transformer coil panel. Several glue injection through holes are provided on the side wall and the bottom of the forming cavity. The bottom of the mold cover is recessed with a positioning mold cavity corresponding to the tubular grid cloth. Screw positioning holes are provided at the edge of the mold cover to facilitate fixing the mold cover on the bottom film through screws. A positioning pin corresponding to the middle of the tubular grid cloth is provided in the positioning mold cavity. A handle is provided on the side of the bottom mold, and the design is user-friendly. The bottom mold is preferably made of wood.

[0039] Step 2: Stack several transverse grid cloths and place them in the forming cavity. Place the tubular grid cloth and the longitudinal grid cloth in the terminal positioning groove and the longitudinal positioning groove respectively, cover the mold cover, and fix the mold cover on the bottom mold through screws to obtain an assembly.

[0040] Step 3: Immerse the assembly in insulating paint so that the insulating paint penetrates into the transverse grid cloth assembly, the tubular grid cloth, and the longitudinal grid cloth through the glue injection through holes.

[0041] Step 4: Take out the assembly and put it into a curing furnace for heating and curing to form. After forming, remove the mold cover and the bottom mold to obtain the dry-type transformer coil panel.

[0042] The present utility model improves the anti-cracking ability of the dry-type transformer coil, ensures the product life, and improves the production efficiency at the same time.

[0043] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalent scope.

Claims

1. A dry-type transformer coil panel, characterized in that: It includes a transverse mesh cloth assembly, a tubular mesh cloth, and a longitudinal mesh cloth. The transverse mesh cloth assembly is formed by stacking several transverse mesh cloths in sequence. The transverse mesh cloths are provided with terminal positioning holes and longitudinal positioning holes. The terminal positioning holes and longitudinal positioning holes of several transverse mesh cloths are stacked to form terminal positioning grooves and longitudinal positioning grooves respectively. The tubular mesh cloth is arranged in the terminal positioning groove, and the longitudinal mesh cloth is arranged in the longitudinal positioning groove. An insulating paint layer is arranged on the surface of the transverse mesh cloth assembly, between the tubular mesh cloth and the groove wall of the terminal positioning groove, and between the longitudinal mesh cloth and the groove wall of the longitudinal positioning groove. The transverse mesh cloth, the tubular mesh cloth, and the longitudinal mesh cloth are in a grid shape, and insulating paint is filled between the grids.

2. The dry-type transformer coil panel according to claim 1, characterized in that: The longitudinal positioning hole is a square hole, the transverse mesh cloth component is a rectangular parallelepiped, and the longitudinal mesh cloth is a square.

3. The dry-type transformer coil panel according to claim 1, characterized in that: The insulating paint layer is an epoxy resin layer.

4. The dry-type transformer coil panel according to claim 1, characterized in that: The horizontal mesh cloth, tubular mesh cloth and vertical mesh cloth are all epoxy glass mesh cloth.

5. The dry-type transformer coil panel according to claim 1, characterized in that: There are a plurality of longitudinal positioning holes and a plurality of terminal positioning holes on the transverse mesh cloth.

6. The dry-type transformer coil panel according to claim 1, characterized in that: The height of the longitudinal mesh cloth is equal to the thickness of the transverse mesh cloth assembly, and the height of the tubular mesh cloth is greater than the thickness of the transverse mesh cloth assembly.

7. A forming die for a dry-type transformer coil panel according to any one of claims 1 to 6, characterized in that: It includes a bottom mold and a mold cover. The bottom mold is provided with a molding cavity corresponding to the dry-type transformer coil panel. The side wall and bottom of the molding cavity are provided with a plurality of glue inlet holes. The bottom of the mold cover is concavely provided with a positioning mold cavity corresponding to the tubular mesh cloth, and the edge of the mold cover is provided with screw positioning holes.

8. The forming die for the dry-type transformer coil panel according to claim 7, characterized in that: A positioning pin corresponding to the middle of the tubular mesh cloth is arranged in the positioning mold cavity.

9. The forming die for the dry-type transformer coil panel according to claim 7, characterized in that: A handle is provided on the side of the bottom mold.

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