Casting coil device and production method thereof

Abstract

The present invention discloses a cast coil device and a production method thereof, wherein the cast coil device comprises: a coil body; a resin insulation layer, which is located inside the coil body and connected to the coil body by casting, and an airway is provided on the coil body outside the resin insulation layer. Through the above device structure and production method, the resin insulation layer and the coil body are fixedly connected by casting and curing, and the resin insulation layer can replace the insulation cylinder. The manufacturer does not need to purchase the insulation cylinder from outside, which can reduce costs, and does not need to specially adjust the insulation cylinder, which can simplify the assembly of the dry-type transformer and improve assembly efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of dry-type transformers, and in particular to a casting coil device and a production method thereof. Background Art

[0002] Currently, for dry-type transformers above 10kV, it is generally necessary to place an insulating cylinder between the high and low voltage coils. When assembling the dry-type transformer, the position of the insulating cylinder needs to be adjusted to ensure its concentricity and keep the electrical gap uniform. The adjustment operation of the insulating cylinder is relatively cumbersome, which affects the assembly efficiency, and the insulating cylinder generally needs to be purchased from outside, and the procurement cost is relatively high. Summary of the invention

[0003] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art, and to provide a casting coil device and a production method thereof, which can reduce costs and facilitate the assembly of a dry-type transformer.

[0004] According to a first aspect of the present invention, a cast coil device is provided, comprising: a coil body; a resin insulating layer located inside the coil body and connected to the coil body by casting, wherein an air channel is provided on the coil body outside the resin insulating layer.

[0005] According to the cast coil device described in the first aspect of the present invention, the resin insulation layer includes: a first isolation layer, which is connected to the coil body by casting; and a second isolation layer in a cylindrical shape, which is arranged inside the first isolation layer.

[0006] According to the cast coil device described in the first aspect of the present invention, a first anti-sticking layer is provided between the first isolation layer and the second isolation layer.

[0007] According to the casting coil device described in the first aspect of the present invention, the first anti-sticking layer is configured as a grease layer or a plastic film layer.

[0008] According to the casting coil device described in the first aspect of the present invention, the second isolation layer includes more than two isolation plates, which are arranged in sequence to form a cylindrical shape, and one side of the isolation plate has a card slot and the other side has a card portion that matches the card slot.

[0009] According to the casting coil device described in the first aspect of the present invention, both sides of the isolation plate are covered with a first anti-sticking layer.

[0010] According to the casting coil device described in the first aspect of the present invention, the bottom of the coil body has a first supporting edge, the first supporting edge is provided with a first limiting groove, and the bottom of the second isolation layer has a first limiting portion extending into the first limiting groove; the top of the coil body has a second supporting edge, the second supporting edge is provided with a second limiting groove, and the top of the second isolation layer has a second limiting portion extending into the second limiting groove.

[0011] According to a second aspect of the present invention, there is provided a method for producing a cast coil device, comprising:

[0012] Step 1, placing the coil body in the mold and positioning it;

[0013] Step 2, pouring resin on the inner side of the coil body, and forming a first isolation layer and an air channel located outside the first isolation layer after the resin is cured, so that the coil body is connected to the first isolation layer by pouring;

[0014] Step 3, coating the first anti-sticking layer on the inner side of the first isolation layer;

[0015] Step 4, pouring a casting resin on the outer side of the first isolation layer, and forming a first isolation plate after the poured resin is cured, and a card slot and a card-fitting portion are formed on both sides of the first isolation plate, and a second limiting portion is formed on the top, and a second anti-sticking layer is covered on both sides of the first isolation plate, and this step is repeated until all the isolation plates are poured to form a second isolation layer;

[0016] Step 5: Install a second supporting edge with a second limiting groove on the top of the coil body, and place the second limiting portion into the second limiting groove.

[0017] According to the production method of the cast coil device described in the second aspect of the present invention, the bottom of the coil body has a first supporting edge, and the first supporting edge is provided with a first limiting groove. In the step 4, a first limiting portion is formed at the bottom of the isolation plate, and the first limiting portion is placed in the first limiting groove.

[0018] The above scheme has the beneficial effect: through the above device structure and production method, the resin insulation layer and the coil body are fixedly connected by casting and curing, the resin insulation layer can replace the insulation cylinder, the manufacturer does not need to purchase the insulation cylinder, which can reduce costs, and there is no need to specially adjust the insulation cylinder, which can simplify the assembly of the dry-type transformer and improve assembly efficiency.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described below in conjunction with the accompanying drawings and embodiments;

[0021] Figure 1 A top view of a coil body and a resin insulation layer in an embodiment of a cast coil device;

[0022] Figure 2 It is a schematic diagram of the decomposition of the resin insulation layer;

[0023] Figure 3It is a cross-sectional view of the resin insulating layer and the coil body. DETAILED DESCRIPTION

[0024] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0025] Reference Figures 1 to 3 The cast coil device includes a coil body 10 and a resin insulating layer 20, wherein the resin insulating layer 20 is located inside the coil body 10 and is cast connected to the coil body 10, and an air channel 30 is provided on the coil body 10 outside the resin insulating layer 20. The air channel 30 can be used for ventilation to dissipate heat.

[0026] The resin is poured and solidified to form a resin insulation layer 20, so that the resin insulation layer 20 is fixedly connected to the coil body 10. The resin has good insulation performance and can be used as a good insulation isolation material. When assembling the dry-type transformer, the resin insulation layer 20 can replace the insulation cylinder, which can reduce the workload of adjustment, improve assembly efficiency, and do not need to purchase a special insulation cylinder, which can reduce costs.

[0027] Specifically, the resin insulating layer 20 includes a first insulating layer 21 and a second insulating layer 22 in a cylindrical shape. The first insulating layer 21 is connected to the coil body 10 by pouring, and the second insulating layer 22 is arranged on the inner side of the first insulating layer 21. A first anti-sticking layer is arranged between the first insulating layer 21 and the second insulating layer 22. The first anti-sticking layer can be set as a grease layer or a plastic film layer. The first insulating layer 21 and the second insulating layer 22 are cast and processed, and the two can be kept tightly matched to avoid separation during the assembly of the dry-type transformer. When casting the resin insulating layer 20, the first insulating layer 21 and the second insulating layer 22 are cast separately. If the size or shape of the inner side of the second insulating layer 22 does not meet the quality requirements, the second insulating layer 22 can be detached by applying pressure, and then the second insulating layer 22 can be re-cast and processed. It is not necessary to detach the entire resin insulating layer 20, so as to avoid damage and scrapping of the coil body 10 when the entire resin insulating layer 20 is detached.

[0028] Furthermore, the second isolation layer 22 includes more than two isolation panels 221, which are arranged in sequence to form a cylindrical shape. One side of the isolation panel 221 has a card slot 222, and the other side has a card-fitting portion 223 that matches the card slot 222. The card slot 222 and the card-fitting portion 223 are arranged vertically, and adjacent isolation panels 221 are connected by card-fitting. Both sides of the isolation panels 221 are covered with a second anti-sticking layer, which can be set as a grease layer or a plastic film layer. The isolation panels 221 are formed by casting, and adjacent isolation panels 221 can be kept tightly fitted to avoid separation during the assembly of the dry-type transformer. If the size or shape of the inner side of a certain isolation panel 221 does not meet the quality requirements, the isolation panel 221 can be disassembled by applying pressure and then re-cast, without the need to disassemble the entire second isolation layer 22.

[0029] The bottom of the coil body 10 has a first supporting edge 12, and a first limiting groove is provided on the first supporting edge 12. The bottom of the second isolation layer 22 has a first limiting portion 23 extending into the first limiting groove. The top of the coil body 10 has a second supporting edge 13, and a second limiting groove is provided on the second supporting edge 13. The top of the second isolation layer 22 has a second limiting portion 24 extending into the second limiting groove. Each isolation plate 221 has the first limiting portion 23 and the second limiting portion 24. Through this structure, the second isolation layer 22 can be positioned to prevent it from detaching.

[0030] The production method of the above-mentioned casting coil device comprises:

[0031] Step 1, placing the coil body 10 in a mold and positioning it;

[0032] Step 2, pouring resin on the inner side of the coil body 10, and after the resin is cured, forming the first isolation layer 21 and the air channel 30 located outside the first isolation layer 21, so that the coil body 10 is connected with the first isolation layer 21 by pouring;

[0033] Step 3, coating the first anti-sticking layer on the inner side of the first isolation layer 21;

[0034] Step 4, pouring a casting resin on the outer side of the first isolation layer 21, and forming a first isolation plate 221 after the poured resin is cured, and a card slot 222 and a card-fitting portion 223 are formed on both sides of the first isolation plate 221, a first limiting portion 23 is formed at the bottom, and a second limiting portion 24 is formed at the top, and a second anti-sticking layer is covered on both sides of the first isolation plate 221. Repeat this step until all the isolation plates 221 are poured to form the second isolation layer 22, and adjacent isolation plates 221 are connected by card-fitting;

[0035] Step 5: Install the second supporting edge 13 with the second limiting groove on the top of the coil body 10, and place the second limiting portion 24 into the second limiting groove.

[0036] Among them, the bottom of the coil body 10 has a first supporting edge 12, and the first supporting edge 12 is provided with a first limiting groove. In step 4, when pouring resin, the resin flows into the first limiting groove, and the first limiting portion 23 is formed after the resin is solidified, and the first limiting portion 23 is placed in the first limiting groove.

[0037] Through the above production method, the resin insulation layer 20 and the coil body 10 are fixedly connected by pouring and curing. The resin insulation layer 20 can replace the insulation tube. The manufacturer does not need to purchase the insulation tube from outside, which can reduce costs. There is no need to specially adjust the insulation tube, which can simplify the assembly of the dry-type transformer and improve assembly efficiency.

[0038] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A casting coil device, characterized in that: include Coil body; A resin insulating layer is located inside the coil body and connected to the coil body by casting, and an air channel is provided on the coil body outside the resin insulating layer; A first isolation layer, connected to the coil body by casting; A second insulating layer in a cylindrical shape is arranged inside the first insulating layer; A first anti-sticking layer is provided between the first isolation layer and the second isolation layer; The first anti-sticking layer is configured as a grease layer or a plastic film layer; The second isolation layer comprises more than two isolation plates, which are arranged in sequence to form a cylindrical shape, and one side of the isolation plate has a card slot, and the other side has a card-fitting portion that matches the card slot; Both sides of the isolation plate are covered with a first anti-sticking layer; It is characterized in that the bottom of the coil body has a first supporting edge, the first supporting edge is provided with a first limiting groove, and the bottom of the second isolation layer has a first limiting portion extending into the first limiting groove; the top of the coil body has a second supporting edge, the second supporting edge is provided with a second limiting groove, and the top of the second isolation layer has a second limiting portion extending into the second limiting groove.

2. The method for producing a cast coil device according to claim 1, characterized in that: include: step Step 1, placing the coil body in the mold and positioning it; Step 2, pouring resin on the inner side of the coil body, and forming a first isolation layer and an air channel located outside the first isolation layer after the resin is cured, so that the coil body is connected to the first isolation layer by pouring; Step 3, coating the first anti-sticking layer on the inner side of the first isolation layer; Step 4, pouring resin on the outside of the first isolation layer, and forming a first isolation plate after the poured resin is cured, and a card slot and a card-fitting portion are formed on both sides of the first isolation plate, and a second limiting portion is formed on the top, and a second anti-sticking layer is covered on both sides of the first isolation plate, and this step is repeated until all isolation plates are poured to form a second isolation layer; Step 5: Install a second supporting edge with a second limiting groove on the top of the coil body, and place the second limiting portion into the second limiting groove.

3. The method for producing a cast coil device according to claim 2, characterized in that: The bottom of the coil body has a first supporting edge, and the first supporting edge is provided with a first limiting groove. In step 4, a first limiting portion is formed at the bottom of the isolation plate, and the first limiting portion is placed in the first limiting groove.

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