Insulating cylinder for cabin dry-type transformer and integral forming method

Abstract

An inner supporting strip layer of the insulating cylinder is arranged on the periphery of an inner cylinder and comprises a plurality of first supporting strips distributed in parallel, an outer cylinder sleeves the periphery of the inner cylinder, the inner supporting strip layer is in contact with the outer peripheral wall of the inner cylinder and the inner peripheral wall of the outer cylinder to play a supporting role, and an outer supporting strip layer is arranged on the periphery of the outer cylinder and comprises a plurality of second supporting strips distributed in parallel. The supporting strips comprise a plurality of second supporting strips and third supporting strips, the second supporting strips are correspondingly connected with the peripheries of the first supporting strips, and the third supporting strips are located between the adjacent second supporting strips. The integrated forming method comprises the steps of mold preparation, material preparation, integrated forming operation, drying curing and demolding and post-treatment. By optimizing the structural design and adopting glass fiber and resin materials, the mechanical performance and the heat dissipation effect of the insulating cylinder are improved, tedious steps and time cost are reduced, the overall stability is enhanced, the heat dissipation performance is improved, the safety and reliability of transformer operation are ensured, and the service life of the transformer is prolonged. And a better and more efficient solution is provided for the insulation requirement of the cabin dry-type transformer.

Description

Technical Field

[0001] The present invention relates to the field of transformer manufacturing, in particular to the application and molding process of insulating materials, and specifically to an insulating cylinder for a cabin dry-type transformer and an integrated molding method. Background Art

[0002] In the manufacturing field of dry-type transformers in the cabin, the insulating cylinder is a key insulating component between high and low voltage coils, and its performance and production efficiency have always been the focus of technical improvement. The traditional insulating cylinder usually adopts a double-layer structure, which is composed of two insulating cylinders of different sizes nested. This design not only requires multiple sets during the production process, which increases the cumbersomeness of the operation, but also has certain limitations in mechanical properties and heat dissipation effects. Although the existing arc-shaped stay process can provide a certain support effect, its design is complex, the production cost is high, and the dimensional accuracy requirements are extremely high. A slight deviation will affect the overall mechanical properties. In addition, the size setting of traditional paper tubes and stays is often unreasonable, resulting in poor heat dissipation of the transformer body, which is difficult to meet the requirements of modern transformers for efficient heat dissipation and high mechanical strength. Therefore, the development of an insulating cylinder and its forming method that can simultaneously improve heat dissipation performance and mechanical strength and simplify the production process has become a technical problem that needs to be solved in this field. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes an insulating cylinder for a cabin dry-type transformer and an integrated molding method, which can According to the first aspect of the present invention, an insulating cylinder for a dry-type transformer in a nacelle and an integrated molding method are characterized by comprising: An insulating cylinder for a cabin dry-type transformer comprises an inner cylinder, an outer cylinder, an inner support layer and an outer support layer. The inner support layer is arranged on the outer periphery of the inner cylinder and comprises a plurality of first support bars distributed in parallel. The outer cylinder is sleeved on the outer periphery of the inner cylinder, and the inner support layer contacts the outer peripheral wall of the inner cylinder and the inner peripheral wall of the outer cylinder to play a supporting role. The outer support layer is arranged on the outer periphery of the outer cylinder and comprises a plurality of second support bars and a third support bar, wherein the second support bars correspond to the outer periphery of the first support bars, and the third support bars are located between adjacent second support bars. The inner cylinder and the outer cylinder are made of insulating cardboard, and the inner support layer and the outer support layer are also made of insulating cardboard. The end of the inner cylinder protrudes outward relative to the end of the outer cylinder, and both ends extend out of the outer cylinder. The thickness of the first, second and third support bars is greater than the wall thickness of the inner cylinder and the outer cylinder. The angle between adjacent first support bars is 30°, and the angle between adjacent second support bars and third support bars is 15°. The first and second support bars are located in the same radial direction of the inner cylinder and are relatively flush.

[0004] One-piece molding methods include: A. Mold Preparation: Design and fabricate an integrated mold. The mold includes a cylindrical main body with three sub-bodies inside the main body. The sub-bodies are fixed to the main body by bolts to form a cylinder on the outer surface of the mold. There is a central axis in the center of the cylinder, and 2 - 5 radial supports are provided on the central axis inside the cylinder. The radial supports are composed of three main supports connected to three sub-supports by double-headed bolts. The double-headed bolts adjust the main and sub-supports. The outer ends of the sub-supports are vertically fixed on the sub-bodies, and the outer surface of the sub-bodies is an insulating cylinder. The sub-bodies are strip-shaped, and N small holes are drilled on the outer surface of the cylindrical main body of the mold to facilitate drainage and vacuum pumping; B. Material Preparation: Select materials such as fiberglass yarn and resin; C. One-piece Molding Operation: Pass the fiberglass yarn through the spinneret of the winding machine, and pass through the resin glue solution in the dipping tank, and wind it on the central axis of the mold from left to right in sequence, and then wind it once from right to left to form an inner structure layer.

[0005] Mix the fiberglass yarn and whisker fiber yarn and pass them through the spinneret of the winding machine, and pass through the resin glue solution in the dipping tank, and wind them on the central axis of the mold from left to right in sequence, and then wind it once from right to left to form an intermediate transition layer.

[0006] Pass the fiberglass yarn through the spinneret of the winding machine again, and pass through the resin glue solution in the dipping tank, and wind it on the central axis of the mold from left to right in sequence, and then wind it once from right to left to form an outer structure layer, completing the one-piece molding; D. Drying and Curing: Put the insulating cylinder blank into the oven for drying and curing.

[0007] E. Demolding and Post-treatment: Demold the formed insulating cylinder from the mold and perform necessary post-treatment, such as trimming the burrs and cleaning the surface, etc.

[0008] According to the insulating cylinder for the cabin dry-type transformer and the one-piece molding method of the embodiments of the present invention, it has at least the following beneficial effects: By optimizing the structural design of the inner cylinder, outer cylinder and brace layer, and using fiberglass and resin materials, the mechanical properties and heat dissipation effect of the insulating cylinder are significantly improved. The application of the integrated mold and the advanced winding process make the production process more efficient, reducing the cumbersome steps and time costs in the traditional process. At the same time, precisely controlling the thickness and position of the braces not only enhances the overall stability of the insulating cylinder, but also effectively expands the gap between the inner cylinder and the outer cylinder, further improving the heat dissipation performance and ensuring the safety and reliability of the transformer during operation. In addition, this method avoids multiple adhesions and installations, reduces product defects caused by unstable bonding quality, improves the qualified rate and quality consistency of the products, and provides a better and more efficient solution for the insulation requirements of the cabin dry-type transformer.

[0009] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 is a schematic diagram of a transformer insulating cylinder according to an embodiment of the present invention; Figure 2 is a schematic top view of a transformer insulating cylinder according to an embodiment of the present invention; Figure 3 is Figure 2 an enlarged schematic diagram of the portion marked as A shown; Figure 4 is a schematic structural diagram of a mold according to an embodiment of the present invention.

[0011] 1. Cylindrical main body; 2. Bolt; 3. Sub-support; 4. Double-headed bolt; 5. Main support; 6. Central axis; 7. Sub-main body; 8. Insulating cylinder; 100. Inner cylinder; 200. Outer cylinder; 300. First brace; 400. Second brace; 500. Third brace; 600. Inner brace layer; 800. Outer brace layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0012] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0013] In the description of the present invention, it should be understood that for the orientation descriptions, such as upper, lower, front, rear, left, right, etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings, and is only for facilitating the description of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0014] In the description of the present invention, the meaning of "a number of" is one or more, the meaning of "a plurality of" is two or more, "greater than", "less than", "exceeding", etc. are understood as not including the present number, and "above", "below", "within", etc. are understood as including the present number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0015] In the description of the present invention, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0016] Referring to Figures 1-4 , according to the insulating cylinder for an engine room dry-type transformer and the integral molding method according to the first aspect embodiment of the present invention, it is characterized in that it includes: The insulating cylinder for an engine room dry-type transformer includes an inner cylinder, an outer cylinder, an inner support strip layer, and an outer support strip layer. The inner support strip layer is arranged on the outer periphery of the inner cylinder and includes a plurality of first support strips distributed in parallel. The outer cylinder sleeves the outer periphery of the inner cylinder, and the inner support strip layer contacts the outer peripheral wall of the inner cylinder and the inner peripheral wall of the outer cylinder to play a supporting role. The outer support strip layer is arranged on the outer periphery of the outer cylinder and includes a plurality of second support strips and third support strips. The second support strips are correspondingly connected to the outer periphery of the first support strips, and the third support strips are located between adjacent second support strips. The inner cylinder and the outer cylinder are made of insulating cardboard, and the inner support strip layer and the outer support strip layer are also made of insulating cardboard. The end of the inner cylinder extends outwards relative to the end of the outer cylinder, and both ends extend out of the outer cylinder. The thicknesses of the first, second, and third support strips are greater than the wall thicknesses of the inner cylinder and the outer cylinder. The included angle between adjacent first support strips is 30°, and the included angle between adjacent second support strips and third support strips is 15°. The first and second support strips are located in the same radial direction of the inner cylinder and are relatively flush.

[0017] The insulating cylinder for an engine room dry-type transformer includes: an inner cylinder 100, an inner support strip layer 6. The insulating cylinder can have better mechanical properties.

[0018] The inner support strip layer 600 is arranged on the outer periphery of the inner cylinder 100, and this layer includes a plurality of first support strips 300 distributed in parallel on the outer periphery of the inner cylinder 100. The outer cylinder 200 sleeves the outer periphery of the inner cylinder 100, and the inner support strip layer 600 contacts the outer peripheral wall of the inner cylinder 100 and the inner peripheral wall of the outer cylinder 200 respectively to play a relative supporting role between the two.

[0019] The outer support bar layer 800 is disposed on the outer periphery of the outer cylinder 200, and it includes a plurality of second support bars 400 and a plurality of third support bars 500. Each of the second support bars 400 is connected to the outer periphery of the first support bar 300 in a one-to-one correspondence, and the third support bar 500 is located between two adjacent second support bars 400. The inner support bar layer 600 between the inner cylinder 100 and the outer cylinder 200 can effectively support the two relatively, and the outer support bar layer 800 can further support the outer cylinder 200 and the inner cylinder 100 from the outer periphery of the outer cylinder 200. The first support bar 300 and the second support bar 400 are corresponding on the same horizontal line, which can effectively improve the radial mechanical performance of the transformer, and the third support bar 500 can also improve the internal supporting force of the high-voltage coil. Therefore, under the combined action of the inner support bar layer 600 and the outer support bar layer 800, the inner cylinder 100 and the outer cylinder 200 can effectively improve the stability and mechanical performance. The first support bar 300 and the second support bar 400 are superposed on each other, which can effectively enhance the mechanical performance between the inner cylinder 100 and the outer cylinder 200. The third support bar 500 supports the outer cylinder 200 in a staggered manner, which can further enhance the overall mechanical performance, so that the insulating cylinder has better mechanical performance.

[0020] In some embodiments, referring to Figure 2 , the first support bar 300 and the second support bar 400 are located on the same radial direction of the inner cylinder 100 and are relatively flush. The first support bar 300 and the second support bar 400 located on the same radial direction can improve the firmness between the inner cylinder 100 and the outer cylinder 200 in this radial direction, thereby increasing the mechanical performance of the insulating cylinder. And, since the first support bar 300 and the second support bar 400 are relatively flush, they located on the same horizontal line can smoothly increase the strength at the same radial position, avoiding the problem that the upper limit of strength is reduced due to the misalignment of the two.

[0021] In some embodiments, referring to Figure 3 , the included angle between two adjacent first support bars 300 is 30°. After determining this included angle, the distribution of each first support bar 300 relative to the inner cylinder 100 can be accurately planned, so as to ensure that the mechanical performance between the inner cylinder 100 and the outer cylinder 200 is enhanced accurately and smoothly by the first support bar 300. Since the first support bar 300 and the second support bar 400 are relatively flush in the same radial direction, the determination of the angle between the first support bars 300 will also determine the distribution mode of the second support bars 400, so as to ensure that the distributions of both can be determined to ensure smooth operation.

[0022] Specifically, both the first support bar 300 and the second support bar 400 are twelve, and they are evenly distributed on the outer periphery of the inner cylinder 100 and the outer periphery of the outer cylinder 200 respectively. Of course, the number and distribution mode of the first support bar 300 and the second support bar 400 are not unique. For example, they can also be both ten, and the relative angle between two adjacent first support bars 300 is 10°. The specific implementation method can be adjusted according to actual needs and will not be limited here.

[0023] In some embodiments, referring to Figure 3 , the included angle between the adjacent second support bars 400 and the third support bar 500 is 15°. Since the angle between two adjacent second support bars 400 is 30° and the included angle between the third support bar 500 and the second support bar 400 is 15°, the third support bar 500 is located exactly in the middle of two adjacent second support bars 400, which can ensure that the third support bar 500 smoothly compensates the strength evenly on both sides, and further ensure that the formed insulating cylinder has sufficient mechanical properties.

[0024] In some embodiments, referring to Figure 3 , the thicknesses of the first support bar 300, the second support bar 400 and the third support bar 500 are all greater than the wall thickness of the inner cylinder 100. When the thicknesses of the first support bar 300, the second support bar 400 and the third support bar 500 increase while the thickness of the inner cylinder 100 decreases, the gap between the inner cylinder 100 and the outer cylinder 200 will be enlarged, effectively increasing the heat dissipation effect and facilitating the improvement of the use stability of the insulating cylinder.

[0025] Specifically, the thicknesses of the first support bar 300, the second support bar 400 and the third support bar 500 are the same. Of course, the thicknesses of the three can also be different as long as the gap between the inner cylinder 100 and the outer cylinder 200 can be enlarged. The specific implementation manner can be adjusted according to actual needs and will not be limited here.

[0026] In some embodiments, referring to Figure 3 , the thicknesses of the first support bar 300, the second support bar 400 and the third support bar 500 are all greater than the wall thickness of the outer cylinder 200. By increasing the thicknesses of the first support bar 300, the second support bar 400 and the third support bar 500, the overall mechanical properties can be improved, and the thickness of the outer cylinder 200 can be reduced. Reducing the thickness of the outer cylinder 200 can effectively improve the efficiency of heat dissipation inside it and avoid the performance degradation of the insulating cylinder due to overheating.

[0027] Specifically, the diameter of the inner cylinder 100 is 534 mm, the diameter of the outer cylinder 200 is 556 mm, and the wall thicknesses of both are 3 mm. The thicknesses of the first support bar 300 and the second support bar 400 are both 8 mm, the thickness of the third support bar 500 is 7 mm, and the width of the third support bar 500 is 10 mm smaller than the thicknesses of the first support bar 300 and the second support bar 400.

[0028] In some embodiments, referring to Figure 1 , the end of the inner cylinder 100 extends out relative to the end of the outer cylinder 200. The extended part of the inner cylinder 100 can be connected to components such as insulating cardboard and angle rings in the outside world to ensure that the insulating cylinder can be smoothly connected to the target working position and work.

[0029] In some embodiments, referring to Figure 1, both ends of the inner cylinder 100 extend beyond the ends of the outer cylinder 200. In this way, both ends of the inner cylinder 100 can be connected to components such as insulating cardboard and angle rings, ensuring the smooth connection and positioning of the inner cylinder 100 in the working position, and thus enabling it to work stably and smoothly.

[0030] Specifically, the extension amount of the inner cylinder 100 is 33 mm.

[0031] The one-piece forming method includes the following steps: I. Mold preparation Design and fabricate an integrated mold. The mold includes a cylindrical main body 1, with three sub-main bodies 7 provided on its inner side. The two are fixed together by bolts 2, so that a cylinder is formed on the outer surface of the mold. There is a central shaft 6 at the center of the cylinder. On the central shaft 6 inside the cylinder, 2 - 5 radial supports are provided. Such radial supports are composed of three main supports 5 connected to three sub-supports 3 by double-headed bolts 4. The double-headed bolts 4 can be used to adjust the main supports 5 and the sub-supports 3. The outer ends of the sub-supports 3 are vertically fixed on the sub-main bodies 7. The outer surface of the sub-main body 7 is an insulating cylinder 8, and the sub-main body 7 is in a long strip shape. In addition, N small holes are drilled on the outer surface of the mold cylinder main body 1 for drainage and vacuum pumping.

[0032] II. Material preparation Select materials such as fiberglass yarn and resin.

[0033] III. One-piece forming operation 1. Formation of the inner structure layer: Pass the fiberglass yarn through the spinneret of the winding machine. After it passes through the resin sizing in the sizing tank, wind it around the mold central shaft 6 from left to right in sequence, and then wind it once from right to left in sequence.

[0034] 2. Formation of the intermediate transition layer: Mix the fiberglass yarn and whisker fiber yarn and then pass them through the spinneret of the winding machine. After passing through the resin sizing in the sizing tank, wind them around the mold central shaft 6 from left to right in sequence, and then wind them once from right to left in sequence.

[0035] 3. Formation of the outer structure layer: Pass the fiberglass yarn through the spinneret of the winding machine again. After passing through the resin sizing in the sizing tank, wind it around the mold central shaft 6 from left to right in sequence, and then wind it once from right to left in sequence. In this way, the one-piece forming is completed.

[0036] According to the insulating cylinder for an engine room dry-type transformer and the one-piece forming method of the embodiments of the present invention, it has at least the following beneficial effects: In terms of structural design, by optimizing the structures of the inner cylinder, the outer cylinder, and the support strip layer, and using fiberglass and resin materials, the mechanical properties and heat dissipation effect of the insulating cylinder are significantly improved.

[0037] During the production process, the application of the integrated mold and the advanced winding process make the production more efficient, reducing the cumbersome steps and time costs of the traditional process.

[0038] At the same time, the thickness and position of the support bars are precisely controlled, which can not only enhance the overall stability of the insulating cylinder but also effectively expand the gap between the inner cylinder and the outer cylinder, thereby further improving the heat dissipation performance and ensuring the safety and reliability of the transformer operation.

[0039] In addition, this one-piece forming method avoids multiple adhesions and installations, reduces product defects caused by unstable adhesion quality, improves the qualified rate and quality consistency of the products, and provides a better and more efficient solution for the insulation requirements of the cabin dry-type transformer.

[0040] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. An insulating cylinder for a dry-type transformer in a cabin and an integrated molding method, characterized in that: include: An insulating cylinder for a cabin dry-type transformer comprises an inner cylinder, an outer cylinder, an inner support layer and an outer support layer; the inner support layer is arranged on the outer periphery of the inner cylinder, and comprises a plurality of first support bars distributed in parallel; the outer cylinder is sleeved on the outer periphery of the inner cylinder, and the inner support layer contacts the outer peripheral wall of the inner cylinder and the inner peripheral wall of the outer cylinder, and plays a supporting role; the outer support layer is arranged on the outer periphery of the outer cylinder, and comprises a plurality of second support bars and third support bars, the second support bars correspond to the outer periphery of the first support bars, and the third support bars are located between adjacent second support bars; the inner cylinder and the outer cylinder are made of insulating cardboard, and the inner support layer and the outer support layer are also made of insulating cardboard; the end of the inner cylinder protrudes outward relative to the end of the outer cylinder, and both ends protrude out of the outer cylinder; the thickness of the first, second and third support bars is greater than the wall thickness of the inner cylinder and the outer cylinder; the angle between adjacent first support bars is 30°, and the angle between adjacent second and third support bars is 15°; the first and second support bars are located in the same radial direction of the inner cylinder and are relatively flush; One-piece molding methods include: A. Mold preparation: Design and make an integrated mold. The mold includes a cylindrical main body. Three sub-main bodies are arranged inside the main body. They are fixed to the main body by bolts to form a cylinder on the outer surface of the mold. There is a central axis in the center of the cylinder. 2-5 radial supports are arranged on the central axis inside the cylinder. The radial supports are composed of three main supports connected to three sub-supports by stud bolts. The stud bolts adjust the main and sub-supports. The outer ends of the sub-supports are vertically fixed on the sub-main body. The outer surface of the sub-main body is an insulating cylinder. The auxiliary body is in the shape of a long strip, and N small holes are drilled on the outer surface of the mold cylinder body to facilitate drainage and vacuum extraction; B. Material preparation: Select materials such as glass fiber yarn and resin; C. One-piece molding operation: The glass fiber yarn passes through the spinneret of the winding machine and passes through the resin glue in the dipping tank, and is wound on the central axis of the mold from left to right, and then wound once from right to left to form an inner structure layer; The glass fiber yarn and whisker fiber yarn are mixed and passed through the spinneret of the winding machine, and then passed through the resin glue in the dipping tank, and are wound on the central axis of the mold from left to right, and then wound once from right to left to form an intermediate transition layer; The glass fiber yarn is passed through the spinneret of the winding machine again, and passes through the resin glue in the dipping tank, and is wound on the central axis of the mold from left to right, and then wound once from right to left to form an outer structure layer, completing the one-piece molding; D. Drying and curing: Place the insulating tube blank into an oven for drying and curing; E. Demolding and post-processing: Remove the formed insulation tube from the mold and perform post-processing, such as trimming burrs and cleaning the surface.

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