Dry-type transformer coil panel and preparation method thereof

Abstract

The embodiment of the invention discloses a dry-type transformer coil panel and a preparation method 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 pieces of transverse gridding cloth in sequence, and terminal positioning holes and longitudinal positioning holes are formed in the transverse gridding cloth; 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. The anti-cracking capability of the panel and the terminal can be improved, and the service life of a product is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and in particular to a dry-type transformer coil panel and a preparation method thereof. Background Art

[0002] After the dry-type transformer coil is wound, the coil mold must be treated with epoxy resin casting to improve the insulation and mechanical properties of the transformer and enhance the transformer's seismic resistance. Some dry-type transformer cast coils will crack at the coil end plates and terminals in extremely severe weather. As the transformer runs, the insulation at the cracks will age prematurely, which may cause safety accidents. Summary of the invention

[0003] The technical problem to be solved by the embodiments of the present invention is to provide a dry-type transformer coil panel and a preparation method thereof to prevent cracks from occurring at the panel and terminals.

[0004] In order to solve the above technical problems, an embodiment of the present invention proposes a dry-type transformer coil panel, including a transverse mesh cloth assembly, a tubular mesh cloth, and a longitudinal mesh cloth. The transverse mesh cloth assembly is formed by stacking a plurality of transverse mesh cloths in sequence. The transverse mesh cloths are each provided with terminal positioning holes and longitudinal positioning holes. The terminal positioning holes and longitudinal positioning holes of the plurality of transverse mesh cloths are stacked to form a terminal positioning groove and a longitudinal positioning groove, 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.

[0005] Furthermore, 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.

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

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

[0008] Furthermore, there are a plurality of longitudinal positioning holes and a plurality of terminal positioning holes on the transverse mesh cloth.

[0009] Further, 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.

[0010] Accordingly, an embodiment of the present invention further provides a method for preparing a dry-type transformer coil panel, comprising: Step 1: Prepare a tubular mesh cloth, a longitudinal mesh cloth and several transverse mesh cloths, and prepare a molding mold, the molding mold 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 the bottom of the molding cavity are provided with several 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 a screw positioning hole; Step 2: stack several transverse mesh cloths and place them in the molding cavity, place the tubular mesh cloth and the longitudinal mesh cloth in the terminal positioning groove and the longitudinal positioning groove respectively, cover the mold cover, and fix the mold cover to the bottom mold by screws to obtain an assembly; Step 3: Immerse the assembly into insulating paint, so that the insulating paint penetrates into the horizontal mesh cloth assembly, the tubular mesh cloth, and the longitudinal mesh cloth through the glue inlet through hole; Step 4: Take out the assembly and put it into the curing furnace for heating and curing. After forming, remove the mold cover and bottom mold to obtain the dry-type transformer coil panel.

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

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

[0013] The beneficial effects of the present invention are as follows: the present invention improves production efficiency and can be applicable to the dry-type casting coils used; the present invention can improve the anti-cracking ability of the panel and the terminal and ensure the service life of the product; the present invention is convenient for users to produce. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional structural diagram of the horizontal mesh cloth according to an embodiment of the present invention.

[0015] Figure 2 It is a three-dimensional structural diagram of a dry-type transformer coil panel according to an embodiment of the present invention.

[0016] Figure 3 It is a three-dimensional structural diagram of the tubular mesh cloth according to an embodiment of the present invention.

[0017] Figure 4 It is a three-dimensional structural diagram of the longitudinal mesh cloth according to an embodiment of the present invention.

[0018] Figure 5 It is a three-dimensional structural diagram of a dry-type transformer coil panel according to an embodiment of the present invention when placed in a bottom mold.

[0019] Figure 6 It is a three-dimensional structural diagram of an assembly according to an embodiment of the present invention.

[0020] Figure 7 It is a three-dimensional structural diagram of the mold cover according to an embodiment of the present invention.

[0021] Figure 8It is a three-dimensional structural diagram of the bottom mold of an embodiment of the present invention.

[0022] Fig. 9 It is a three-dimensional structural diagram of a positioning pin according to an embodiment of the present invention.

[0023] Description of Figure Numbers Transverse mesh cloth 1, tubular mesh cloth 2, longitudinal mesh cloth 3, terminal positioning hole 4, longitudinal positioning hole 5, bottom mold 6, glue inlet through hole 7, handle 8, mold cover 9, positioning mold cavity 10, positioning pin 11, screw 12, screw positioning hole 13. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present invention is further described in detail below in conjunction with the drawings and specific embodiments.

[0025] In the embodiments of the present invention, if there are directional indications (such as up, down, left, right, front, back, etc.), they are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0026] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0027] Please refer to Figure 1 to Figure 4 The dry-type transformer coil panel of the embodiment of the present invention includes a transverse mesh cloth component, a tubular mesh cloth, and a longitudinal mesh cloth.

[0028] The transverse mesh cloth assembly is formed by stacking several transverse mesh cloths in sequence, each of which is 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.

[0029] The tubular grid is arranged in the terminal positioning groove. The present invention also uses tubular grid cloth for pouring reinforcement at the terminal to improve the crack resistance. The longitudinal grid is arranged in the longitudinal positioning groove.

[0030] An insulating paint layer is provided on the surface of the transverse mesh cloth assembly, the outer surface of the tubular mesh cloth, between the tubular mesh cloth and the slot wall of the terminal positioning slot, and between the longitudinal mesh cloth and the slot wall of the longitudinal positioning slot. The transverse mesh cloth, the tubular mesh cloth, and the longitudinal mesh cloth are in a grid shape and the grids are filled with insulating paint. The grids of the transverse mesh cloth assembly, the tubular mesh cloth, and the longitudinal mesh cloth are evenly distributed, which can improve the anti-splitting ability.

[0031] The present invention is convenient for mass production, saves time, improves production efficiency, and can be applicable to different types of coils.

[0032] As an implementation mode, 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.

[0033] As an implementation method, the insulating paint layer is an epoxy resin layer. The transverse mesh cloth, the tubular mesh cloth, and the longitudinal mesh cloth are all epoxy glass mesh cloths. The epoxy glass mesh cloth is firmly combined with the poured epoxy resin, like a steel frame in concrete. It can prevent the panel from cracking due to the hot and cold effects of the cast parts and the huge electric force when the coil is suddenly short-circuited, greatly improving the overall mechanical strength of the coil.

[0034] As an implementation mode, there are multiple longitudinal positioning holes and multiple terminal positioning holes on the transverse mesh cloth.

[0035] As an implementation mode, 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, which can better protect the terminals.

[0036] The method for preparing a dry-type transformer coil panel according to an embodiment of the present invention comprises steps 1 to 4.

[0037] Step 1: Prepare a tubular mesh, a longitudinal mesh and several transverse meshes, and prepare a molding mold. Figures 5 to 9 The molding mold 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 the 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. The edge of the mold cover is provided with a screw positioning hole, which is convenient for fixing the mold cover on the bottom film by screws. The positioning mold cavity is provided with a positioning pin corresponding to the middle of the tubular mesh cloth. A handle is provided on the side of the bottom mold, which is humanized in design. The bottom mold is preferably made of wood.

[0038] Step 2: Stack several transverse mesh cloths and place them in the molding cavity, place the tubular mesh cloth and the longitudinal mesh cloth in the terminal positioning groove and the longitudinal positioning groove respectively, cover the mold cover, and fix the mold cover to the bottom mold with screws to obtain an assembly.

[0039] Step 3: Immerse the assembly into insulating varnish, so that the insulating varnish penetrates into the horizontal mesh cloth assembly, the tubular mesh cloth, and the longitudinal mesh cloth through the glue inlet holes.

[0040] Step 4: Take out the assembly and put it into the curing furnace for heating and curing. After forming, remove the mold cover and bottom mold to obtain the dry-type transformer coil panel.

[0041] The invention improves the crack resistance of the dry-type transformer coil, ensures the product life and improves the production efficiency.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

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 the grids are filled with insulating paint.

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 method for preparing a dry-type transformer coil panel according to any one of claims 1 to 6, characterized in that: include: Step 1: Prepare a tubular mesh cloth, a longitudinal mesh cloth and several transverse mesh cloths, and prepare a molding mold, the molding mold 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 the bottom of the molding cavity are provided with several 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 a screw positioning hole; Step 2: stack several transverse mesh cloths and place them in the molding cavity, place the tubular mesh cloth and the longitudinal mesh cloth in the terminal positioning groove and the longitudinal positioning groove respectively, cover the mold cover, and fix the mold cover to the bottom mold by screws to obtain an assembly; Step 3: Immerse the assembly into insulating paint, so that the insulating paint penetrates into the horizontal mesh cloth assembly, the tubular mesh cloth, and the longitudinal mesh cloth through the glue inlet through hole; Step 4: Take out the assembly and put it into the curing furnace for heating and curing. After forming, remove the mold cover and bottom mold to obtain the dry-type transformer coil panel.

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

9. The method for preparing a 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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