Special-shaped easy insulation cylinder for transformer

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By using a technical means of using a special-shaped easy-insulating cylinder in a dry transformer, including the combination of the first and second insulating layers, POM rods and pull-out rods that wrap the low-voltage coil, the high cost and insulation effect of the existing insulating cylinder are solved by wrapping the first and second insulating layers, POM rods and pull-out rods, the high cost and insulation effect of the existing insulating cylinder are solved. The poor problem is that the insulation cylinder production with lower cost and better insulation effect can be achieved.

CN222507323UActive Publication Date: 2025-02-18SHANGHAI HUGUANG TRANSFORMER +1

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Patent Information

Application Number: CN202323567287.X
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2023-12-27
Publication Date: 2025-02-18
Estimated Expiration: 2033-12-27

AI Technical Summary

Technical Problem

The insulation requirements of the insulating cylinders of existing dry transformers between high and low voltage windings are difficult to meet, and the cost is high, especially at voltage levels of 10kV and below, the insulating cylinder materials are expensive and easy to deform, affecting the insulation effect.

Method used

A special-shaped easy-insulating cylinder is adopted, including a first insulating layer and a second insulating layer. The first insulating layer is wound around the low-voltage coil. The second insulating layer is wound outside the first insulating layer. Combining the POM rod and the lead rod, it is heat formed. Form an integral insulating cylinder.

Benefits of technology

It effectively reduces the main airway distance, ensures the insulation requirements of the transformer, and reduces production costs. It is especially suitable for elliptical and square coils, without the need for special molds, is simple to operate, and reduces repeated work hours.

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Abstract

The utility model relates to the technical field of transformers, and discloses a special-shaped easily-insulating cylinder for a transformer, which relates to a low-voltage coil and comprises a first insulating layer, a second insulating layer and a plurality of drawing rods, the first insulating layer is formed based on the outer side shape of the low-voltage coil, and the second insulating layer is formed based on the outer side shape of the low-voltage coil. The plurality of drawing rods are distributed at the corners of the outer side of the first insulating layer, and the second insulating layer is formed on the outer side of the first insulating layer provided with the plurality of drawing rods. According to the scheme, the whole structure is stable and reliable, continuous manufacturing can be directly carried out on the coil, unnecessary working hours are reduced, the whole production process is simple, and operation is convenient.

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Description

Technical Field

[0001] The utility model relates to the technical field of transformers, in particular to a special-shaped easy-to-insulate cylinder for transformers. Background Art

[0002] The main air path between the high and low voltage windings of a dry-type transformer must meet the insulation requirements between the high and low voltage windings. However, if the main air path is too large, the external high voltage coil will also become larger, and the cost of the transformer will also increase. Therefore, placing an insulating tube in the main air path and shortening the insulation distance of the main air path can reduce the cost of transformer production.

[0003] The windings of dry-type transformers with voltage levels of 10kV and below are usually round, oval, or square windings, and the corresponding insulating tubes are also round, oval, or square insulating tubes. At present, the insulating tubes of dry-type transformers with voltage levels of 10kV and below are either made of composite polyester film (PET) materials directly by transformer manufacturers, or epoxy glass fiber insulating tubes purchased from insulating tube manufacturers. The former PET insulating tubes are relatively soft, especially in oval and square coils. The corresponding molds must be remade, and then the shaping process is carried out to meet the shape of such insulating tubes, which increases the manufacturing cost. At the same time, during the assembly stage, the PET insulating tubes will deform as soon as they are subjected to force. Even the round insulating tubes cannot be evenly divided between the high and low voltage coils. One side of the PET insulating tube is easy to be close to the high-voltage coil, which brings hidden dangers. The latter epoxy glass fiber insulating tubes are expensive and gradually disappear in dry-type transformers with voltage levels of 10kV and below. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a special-shaped easy-to-insulate cylinder for a transformer, which can effectively solve the problems in the prior art.

[0005] The technical solution adopted by the utility model is: a special-shaped easy-to-insulate cylinder for a transformer, which relates to a low-voltage coil, including a first insulating layer, a second insulating layer and a plurality of pull-out rods, wherein the first insulating layer is formed based on the outer shape of the low-voltage coil, the plurality of pull-out rods are distributed at the corners of the outer side of the first insulating layer, and the second insulating layer is formed on the outer side of the first insulating layer where the plurality of pull-out rods are arranged.

[0006] In some embodiments, the first insulating layer is formed by winding around the outside of the low voltage coil.

[0007] In some embodiments, the cross-section of the pull-out rod is an I-shaped structure.

[0008] In some embodiments, the first insulating layer and / or the second insulating layer is formed of at least one insulating DMD layer.

[0009] In some embodiments, the insulating DMD layer is composed of a layer of high melting point polyester film and polyester fiber non-woven fabric covering both sides of the high melting point polyester film.

[0010] In some embodiments, the special-shaped easy-to-insulate cylinder further includes a plurality of POM rods, and the plurality of POM rods are evenly distributed in the second insulating layer.

[0011] In some embodiments, the POM rod can be pulled out after the special-shaped easy-insulation cylinder is cured and formed.

[0012] Through the above technical solution, a second insulating layer is wound around the outside of the low-voltage coil covered with the first insulating layer, and cooperates with the first insulating layer to improve the electrical insulation performance.

[0013] Preferably, the pull-out rod is made of glass fiber material, and the POM rod is made of acetal resin material.

[0014] Through the above technical solution, the pull-out rod is made of glass fiber material, which is relatively strong and improves the structural strength of the insulating tube. A POM rod made of acetal resin material is provided, which has high strength, strong wear resistance and is easy to reuse.

[0015] When the above technical scheme is used, the first insulating layer is wrapped around the outside of the low-voltage coil, the POM rod is coated with a release agent and evenly placed on the outside of the first insulating layer, the pull-out rod is evenly pasted on the corners of the outside of the first insulating layer, and the second insulating layer is wrapped around the outside of the first insulating layer for multiple turns until the insulation thickness reaches the designed thickness. The manufacturing material is placed in an oven together with the low-voltage coil, the temperature is raised to 120℃-125℃ and baked for 2h-2.5h. The material is fixed into shape, and the POM rod is removed to form an insulating tube that is a whole with the low-voltage coil.

[0016] Compared with the prior art, the special-shaped easy-to-insulate cylinder for transformers provided by the utility model has the following beneficial effects:

[0017] 1. The special-shaped easy-to-insulate cylinder for transformers is provided with a first insulating layer, which wraps and covers the low-voltage coil, provides good electrical insulation performance, and is provided with a POM rod, which provides a certain support function before the insulating cylinder is formed, and is finally pulled out and can be reused. An "I"-shaped lead-out rod is provided, which has good structural strength and provides mechanical support for the insulating cylinder. A second insulating layer is wound around the outside of the low-voltage coil covered with the first insulating layer, which cooperates with the first insulating layer to improve the good electrical insulation performance. The lead-out rod is made of glass fiber material, which is relatively strong and improves the structural strength of the insulating cylinder. A POM rod made of acetal resin material is provided, which has high strength and strong wear resistance and is easy to be reused;

[0018] 2. When manufacturing the special-shaped easy-to-insulate cylinder for transformers, the first insulating layer is wrapped around the outside of the low-voltage coil, the POM rod is coated with a release agent and evenly placed on the outside of the first insulating layer, the pull-out rod is evenly pasted on the corners of the outside of the first insulating layer, and the second insulating layer is wrapped around the outside of the first insulating layer for multiple turns until the thickness designed for insulation requirements is reached. The manufacturing material is placed in an oven together with the low-voltage coil, the temperature is raised to 120℃-125℃ and baked for 2h-2.5h. The material is fixed into shape, and the POM rod is removed to form an insulating cylinder that is a whole with the low-voltage coil, which reduces the main airway distance and also ensures the insulation requirements of the transformer. Especially when used for elliptical and square coils, there is no need to specially make corresponding molds, which reduces costs. At the same time, the insulating cylinder is made by directly making it continuously on the coil after the low-voltage coil is completed without removing the coil, which reduces unnecessary repeated working hours. The overall production process is simple and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the three-dimensional structure of the special-shaped easy-to-insulate cylinder provided by the utility model when it is placed in an oven from a first-view perspective;

[0020] Figure 2 A second perspective three-dimensional structural schematic diagram of the special-shaped easy-to-insulate cylinder provided by the utility model being placed in an oven;

[0021] Figure 3 This is a schematic diagram of the top surface structure of the special-shaped easy-to-insulate cylinder provided by the utility model when it is placed in an oven;

[0022] Figure 4 This is a schematic diagram of the first three-dimensional structure of the insulating tube made by the utility model;

[0023] Figure 5 The top surface structure schematic diagram of the insulating cylinder made by the utility model.

[0024] Among them: 1. low voltage coil; 2. first insulation layer; 3. second insulation layer; 4. POM rod; 5. pull-out rod. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] like Figure 1-5 As shown, the special-shaped easy-insulation cylinder for a transformer provided by the utility model forms a corresponding special-shaped easy-insulation cylinder for a low-voltage coil 1 .

[0027] The special-shaped easy-to-insulate cylinder is specifically composed of a first insulating layer 2, a second insulating layer 3, a plurality of POM rods 4 and a plurality of drawing rods 5.

[0028] The first insulating layer 2 is formed based on the outer shape of the low-voltage coil 1, and corresponding lead rods 5 are arranged on the outer side of the first insulating layer 2 corresponding to the corners of the low-voltage coil 1; a plurality of POM rods 4 are further arranged on the first insulating layer 2. On this basis, the second insulating layer 3 is formed on the outer side of the first insulating layer 2 where the lead rods 5 and the POM rods 4 are arranged.

[0029] In some implementations of the present invention, the first insulating layer 2 is wound on the outside of the low-voltage coil 1 in a coil-equal-width manner, and the first insulating layer 2 is specifically composed of an insulating DMD layer.

[0030] Preferably, the first insulating layer 2 formed by the insulating DMD layer is wound around the outside of the low-voltage coil 1 in a coil-equal-width manner, and the terminals of the insulating DMD layer are bonded and fixed with Nippon Denko 315 adhesive tape.

[0031] In some embodiments of the present invention, the second insulating layer 3 is wound around the outer side of the first insulating layer 2 in a coil-like manner. The second insulating layer 3 is specifically composed of an insulating DMD layer.

[0032] Preferably, the second insulating layer 3 formed by the insulating DMD layer is wound 4-5 times along the outer side of the first insulating layer 2 in a coil-equal width manner, and the terminals of the insulating DMD layer are bonded and fixed with Nippon Denko 315 adhesive tape.

[0033] As a further explanation, the insulating DMD layer here is specifically a three-layer soft composite layer structure, which is formed by bonding a layer of high melting point polyester film with a polyester fiber non-woven fabric bonded on both sides with an adhesive.

[0034] Preferably, the three-layer soft composite layer structure formed in this way can be further composited with foil impregnated with epoxy and semi-cured to form an insulating DMD layer.

[0035] The insulating DMD layer of such a structure has good electrical insulation performance. The first insulating layer 2 formed based on the insulating DMD layer is formed outside the low-voltage coil 1, providing good electrical insulation protection performance. Furthermore, the second insulating layer 3 formed based on the insulating DMD layer cooperates with the first insulating layer 2 to further improve the electrical insulation protection performance.

[0036] In some embodiments of the utility model, the cross section of the pull rod 5 is an "I" shaped structure, and the pull rod 5 is attached to the corresponding corner outside the first insulating layer 2. The pull rod 5 with an "I" shaped structure has good structural strength and provides mechanical support for the insulating tube.

[0037] In some embodiments of the present invention, the POM rod 4 is coated with a release agent and evenly placed on the outside of the first insulating layer 2, and the cross section of the POM rod 4 is semicircular. By providing the POM rod 4, a certain support function is provided before the insulating tube is formed, and it can be removed after forming and can be reused.

[0038] In some embodiments of the utility model, the pull-out rod 5 adopts a glass fiber rod structure, and the POM rod 4 adopts an acetal resin rod structure. The advantage is that the pull-out rod 5 adopts a glass fiber rod structure, which is relatively strong and improves the structural strength of the insulating tube, and the POM rod 4 adopts an acetal resin rod structure, which has high strength, strong wear resistance, and is easy to reuse.

[0039] In some embodiments of the utility model, the special-shaped easy-to-insulate tube construction scheme for transformers given in this example is used to form the layer, and the first insulating layer 2 is wrapped around the outside of the low-voltage coil 1, and the POM rod 4 is evenly placed on the outside of the first insulating layer 2 after being coated with a release agent, and the pull-out rod 5 is evenly pasted at the corner of the outside of the first insulating layer 2, and the second insulating layer 3 is wrapped around the outside of the first insulating layer 2 for multiple turns until the thickness designed for the insulation requirement is reached, and the manufacturing material is placed in an oven together with the low-voltage coil 1, and the temperature is raised to 120℃-125℃ and baked for 2h-2.5h. The material is fixed and formed, and the POM rod 4 is pulled out to form an insulating tube that is a whole with the low-voltage coil 1.

[0040] The following specifically describes the application and implementation process of the special-shaped easy-to-insulate cylinder configuration solution for transformers provided by the utility model.

[0041] See also Figures 1 to 3 For the corresponding low-voltage coil 1, firstly, the first insulating layer 2 is wound along the outer side of the low-voltage coil 1 in a coil-equal width manner for one turn and the terminal is fixed by adhesive tape, thereby providing external insulation for the low-voltage coil.

[0042] Next, the POM rod 4 is coated with a release agent and evenly placed on the outside of the first insulating layer 2 , and the pull-out rod 5 is evenly pasted on the corners outside the first insulating layer 2 .

[0043] Next, the second insulating layer 3 is wound multiple times along the outer side of the first insulating layer 2 in a coil-equal width manner until the thickness designed for insulation requirements is reached, thereby forming the tube rib of the special-shaped easy-to-insulate tube.

[0044] Next, the tube rim of the special-shaped easy-to-insulate tube is placed in an oven together with the low-voltage coil 1, and the temperature is raised to 120° C.-125° C. and baked for 2h-2.5h to fix the material into shape.

[0045] Finally, the POM rod 4 is removed to form an insulating tube (such as Figure 4and Figure 5 ).

[0046] The special-shaped easy-to-insulate cylinder thus formed reduces the main air path distance while also ensuring the insulation requirements of the transformer. Especially when used for elliptical and square coils, there is no need to specially make corresponding molds, which reduces costs. At the same time, the insulating cylinder can be made directly on the coil without removing the coil after the low-voltage coil is completed, reducing unnecessary repeated working hours. The overall production process is simple and easy to operate.

[0047] 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 special-shaped easy-to-insulate cylinder for a transformer, relating to a low-voltage coil (1), characterized in that: The invention comprises a first insulating layer (2), a second insulating layer (3) and a plurality of drawing rods (5), wherein the first insulating layer (2) is formed based on the outer shape of a low-voltage coil (1), the plurality of drawing rods (5) are distributed at the corners outside the first insulating layer (2), and the second insulating layer (3) is formed outside the first insulating layer (2) on which the plurality of drawing rods (5) are arranged.

2. The special-shaped easy-to-insulate cylinder for transformer according to claim 1, characterized in that: The first insulating layer (2) is formed by winding around the outside of the low-voltage coil (1).

3. The special-shaped easy-to-insulate cylinder for transformer according to claim 1, characterized in that: The cross section of the drawing rod (5) is an "I"-shaped structure.

4. The special-shaped easy-to-insulate cylinder for transformer according to claim 1, characterized in that: The first insulating layer (2) and / or the second insulating layer (3) is formed by at least one insulating DMD layer.

5. The special-shaped easy-to-insulate cylinder for transformer according to claim 4, characterized in that: The insulating DMD layer is composed of a layer of high melting point polyester film and polyester fiber non-woven fabric covering both sides of the high melting point polyester film.

6. The special-shaped easy-to-insulate cylinder for transformer according to claim 1, characterized in that: The special-shaped easy-to-insulate cylinder further comprises a plurality of POM rods (4), wherein the plurality of POM rods (4) are evenly distributed in the second insulating layer (3).

7. The special-shaped easy-to-insulate cylinder for transformer according to claim 6, characterized in that: The POM rod (4) can be pulled out after the special-shaped easy-to-insulate cylinder is solidified and formed.