Single-sided thermal bonding insulating layer enameled wire for power transformer

Abstract

The utility model discloses a single-sided thermal bonding insulating layer enameled wire for a power transformer, which comprises a conductor base material, a PVF insulating layer is arranged outside the conductor base material in an injection molding manner, a single-sided thermal bonding layer is arranged inside the conductor base material, the single-sided thermal bonding layer is connected inside the PVF insulating layer, an oil guide layer is arranged inside the single-sided thermal bonding layer, and the PVF insulating layer is connected inside the oil guide layer. A rhombic block thermal bonding layer is arranged outside the oil guide layer, the oil guide layer is connected to the interior of the single-face thermal bonding layer through the rhombic block thermal bonding layer, an external insulating layer is arranged outside the conductor base material in an injection molding mode, a connecting pipe assembly is arranged at the end of the oil guide layer, and the fixing lantern ring is connected to the end of the oil guide layer in a sleeving mode. According to the utility model, the conductor base material, the PVF insulating layer, the single-sided thermal bonding layer, the oil guide layer, the rhombic block thermal bonding layer, the connecting pipe assembly and the external insulating layer are used in a matched manner, and an oil supply channel can be formed in the conductor base material under the action of the oil guide layer and the rhombic block thermal bonding layer, so that the dissipation of heat in the conductor base material is accelerated.

Description

Technical Field

[0001] The utility model relates to the technical field of power transformers, in particular to a single-sided heat-bonded insulating layer enameled wire for power transformers. Background Art

[0002] The converter transformer is a critical equipment in the ultra-high voltage direct current transmission project. It is the core equipment of the rectifier and inverter interfaces in the AC and DC transmission systems. Its investment and safe operation are the key and important guarantee for the project to achieve power generation benefits. The key role of the converter transformer requires it to have high reliability and high technical performance.

[0003] The effects of AC and DC superimposed electric fields that converter transformers are subjected to for a long time and the effects of DC jump voltage represented by polarity reversal are the main issues that should be considered in the insulation design of converter transformers. Under the action of AC voltage and impulse voltage, the voltage distribution inside the insulation structure is determined by the dielectric constant. Since the dielectric constants of oil and paper are not much different, the electric field is distributed in both oil and paper. Since the ratio of the conductivity coefficient to the dielectric constant of the two insulating materials of oil and paper is very different, the DC field strength in the oil-paper composite insulation is distributed according to the conductivity coefficient, and the AC field strength is distributed according to the dielectric constant. When the polarity of the DC voltage changes rapidly, the oil gap insulation will be subjected to a large electric stress, which is not convenient for cooling and dissipating the heat in the middle of the converter transformer. Utility Model Content

[0004] The utility model aims to provide a single-sided heat-bonded insulating layer enameled wire for a power transformer to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a single-sided heat-bonded insulating layer enameled wire for a power transformer, comprising a conductor substrate;

[0006] A PVF insulating layer is injection molded on the outside of the conductor substrate, a single-sided heat-adhesive layer is provided inside the conductor substrate, the single-sided heat-adhesive layer is connected to the inside of the PVF insulating layer, an oil-conducting layer is provided inside the single-sided heat-adhesive layer, a diamond heat-adhesive layer is provided outside the oil-conducting layer, the oil-conducting layer is connected to the inside of the single-sided heat-adhesive layer through the diamond heat-adhesive layer, an external insulating layer is injection molded on the outside of the conductor substrate, and a connecting pipe assembly is provided at the end of the oil-conducting layer.

[0007] Preferably, the connecting pipe assembly comprises:

[0008] A fixing collar, the fixing collar being sleeved on the end of the oil conducting layer;

[0009] A connecting collar is slidably engaged with the outside of the fixing collar.

[0010] Preferably, the bottom of the fixing ring is fixedly connected to the diamond-shaped thermal adhesive layer, and the bottom of the connecting ring is adhesively connected to the external insulating layer.

[0011] Preferably, a clamping block is fixedly connected to the outer wall of the fixing collar, an arc groove is provided at the bottom of the inner wall of the connecting collar, and the outer wall of the clamping block is slidably clamped in the inner part of the arc groove.

[0012] Preferably, a slide groove matching the block is provided inside the connecting ring, the inner cavity of the slide groove is communicated with the inner cavity of the arc groove, and one side of the inner cavity of the arc groove is filled with an insulator for limiting the block.

[0013] Preferably, a mounting hole is opened at the top of the connecting ring, and a mounting sleeve is fixedly sleeved in the inner cavity of the mounting hole, one end of the outer wall of the mounting sleeve is fixedly connected to a limiting block, and the outer wall of the limiting block and one end of the outer wall of the mounting sleeve are embedded in the interior of the external insulating layer.

[0014] Technical effects and advantages of the utility model:

[0015] The utility model utilizes the coordinated use of a conductor substrate, a PVF insulating layer, a single-sided thermal adhesive layer, an oil conducting layer, a diamond thermal adhesive layer, a connecting pipe assembly and an external insulating layer. Under the action of the oil conducting layer and the diamond thermal adhesive layer, an oil supply channel can be formed inside the conductor substrate, thereby accelerating the dissipation of heat inside the conductor substrate. The connecting pipe assembly facilitates the connection of the oil conducting layer with an external oil supply pipeline to provide cooling and heat dissipating oil therein. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the internal structure of the front side of the utility model.

[0017] Figure 2 For this utility model Figure 1 Enlarged structural diagram at A in the middle.

[0018] Figure 3 It is a schematic diagram of the overall structure of the connecting ring of the utility model.

[0019] In the figure: 1. Conductor substrate; 2. PVF insulation layer; 3. Single-sided thermal adhesive layer; 4. Oil conducting layer; 5. Diamond thermal adhesive layer; 6. Pipe connection assembly; 61. Fixing ring; 62. Connecting ring; 63. Block; 64. Slide groove; 65. Arc groove; 66. Mounting hole; 67. Mounting sleeve; 68. Limit block; 7. External insulation layer. DETAILED DESCRIPTION

[0020] 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.

[0021] The utility model provides Figure 1-3 The single-sided heat-bonded insulating layer enameled wire for power transformer shown in the figure includes a conductor substrate 1. In the production process of the combined conductor, the winding of the wire is normally in a plane. The conductor is flipped 90 degrees by using a special tool and kept without tilting or twisting. At the same time, Dennison insulating material is added to the middle layer to ensure that it is parallel and centered with the conductor. The conductors are pressed against each other through multiple passes of a tic-tac-toe roller, so that the Dennison insulating material forms an oil-conducting layer 4. The outside of the conductor substrate 1 is injection-molded with a PVF insulating layer 2, and the inside of the conductor substrate 1 is provided with a single-sided heat-bonded layer 3, which is connected to the inside of the PVF insulating layer 2, and the inside of the single-sided heat-bonded layer 3 is provided with an oil-conducting layer 4, and the outside of the oil-conducting layer 4 is provided with a diamond heat-bonded layer 5. Since the traditional painting process adopts a mold method, the paint liquid flows vertically upward along the walking path of the conductor. The mold overcomes its own weight and suspends on the paint liquid to control the uniform painting of the four surfaces of the conductor substrate 1, but it cannot solve or limit the amount of paint on the conductor surface. Therefore, a new type of painting fixture is developed. It adopts a bracket type and is equipped with a Teflon paint supply head at the end. Paint is supplied by a metering pump to control the coating amount and supply amount of the paint to achieve a balance, prevent the insulating paint from overflowing on the conductor and causing other surfaces to be painted, increase the inlet furnace temperature, reduce the leveling of the paint after coating, and control the uniformity and consistency of the insulating paint. The oil-conducting layer 4 can form a heat dissipation and oil supply channel inside the conductor substrate 1, thereby dissipating heat and cooling the inside of the conductor substrate 1. The oil-conducting layer 4 is connected to the inside of the single-sided thermal adhesive layer 3 through the diamond thermal adhesive layer 5. The outside of the conductor substrate 1 is injection-molded with an external insulating layer 7. The external insulating layer 7 can improve the overall insulation of the outside of the conductor substrate 1. A connecting pipe assembly 6 is provided at the end of the oil-conducting layer 4.

[0022] In particular, the connecting ring assembly 6 includes a fixed ring 61 and a connecting ring 62. The fixed ring 61 is sleeved on the end of the oil conducting layer 4, and the connecting ring 62 is slidably clamped on the outside of the fixed ring 61. The connecting ring 62 and the fixed ring 61 can improve the sealing of the oil entering and exiting the end of the oil conducting layer 4. The bottom of the fixed ring 61 is fixedly connected to the diamond-shaped thermal adhesive layer 5, and the bottom of the connecting ring 62 is adhesively connected to the external insulating layer 7. The connecting ring 62 can be connected to the external heat dissipation oil supply pipeline of the conductor substrate 1, so as to facilitate the external heat dissipation oil to enter through one end of the oil conducting layer 4 and then be discharged from the other end of the oil conducting layer 4, thereby dissipating the heat inside the conductor substrate 1.

[0023] Furthermore, a block 63 is fixedly connected to the outer wall of the fixing collar 61, and a circular arc groove 65 is provided at the bottom of the inner wall of the connecting collar 62. The outer wall of the block 63 is slidably connected to the inside of the circular arc groove 65. Under the action of the block 63, the stability of the connection between the connecting collar 62 and the fixing collar 61 can be improved. A sliding groove 64 matching the block 63 is provided inside the connecting collar 62. The inner cavity of the sliding groove 64 is connected to the inner cavity of the circular arc groove 65. The sliding groove 64 can be used to fix the fixing collar 61 when the connecting collar 62 is connected to the fixing collar 61. The block 63 is docked with the connecting ring 62, and one side of the inner cavity of the arc groove 65 is filled with an insulator that limits the block 63, and the side of the connecting ring 62 where the arc groove 65 is opened is away from the external insulating layer 7, and the two connecting rings 62 at both ends of the oil guide layer 4 are symmetrically arranged, and the insulator can extrude and limit the block 63 inside the arc groove 65, thereby improving the stability of the connection between the block 63 and the connecting ring 62, and the insulator is integrally arranged with the external insulating layer 7, and the external insulating layer 7 is squeezed into the interior of the arc groove 65 during injection molding, thereby forming an insulator.

[0024] Furthermore, a mounting hole 66 is opened at the top of the connecting ring 62, and a mounting sleeve 67 is fixedly sleeved in the inner cavity of the mounting hole 66. One end of the outer wall of the mounting sleeve 67 is fixedly connected to a limiting block 68. The outer wall of the limiting block 68 and one end of the outer wall of the mounting sleeve 67 are embedded in the outer insulating layer 7. The limiting block 68 can improve the stability of the connection between the mounting sleeve 67 and the external insulating layer 7, thereby improving the stability of the connection between the connecting ring 62 and the external insulating layer 7, and the mounting sleeve 67 can be connected with bolts, so as to facilitate the connection of the fixing ring 61 and the connecting ring 62 to the external oil supply pipeline.

[0025] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A single-sided heat-bonded insulating layer enameled wire for a power transformer, comprising a conductor substrate (1); It is characterized in that The conductor substrate (1) is injection molded with a PVF insulating layer (2) on the outside, the conductor substrate (1) is provided with a single-sided heat-adhesive layer (3) on the inside, the single-sided heat-adhesive layer (3) is connected to the inside of the PVF insulating layer (2), the single-sided heat-adhesive layer (3) is provided with an oil-conducting layer (4) on the inside, the oil-conducting layer (4) is provided with a diamond heat-adhesive layer (5) on the outside, the oil-conducting layer (4) is connected to the inside of the single-sided heat-adhesive layer (3) through the diamond heat-adhesive layer (5), the conductor substrate (1) is injection molded with an external insulating layer (7), and a pipe connection assembly (6) is provided at the end of the oil-conducting layer (4).

2. The single-sided heat-bonded insulating layer enameled wire for power transformer according to claim 1, characterized in that: The pipe connection assembly (6) comprises: A fixing collar (61), wherein the fixing collar (61) is sleeved on the end of the oil-conducting layer (4); A connecting collar (62) is slidably engaged with the outside of the fixing collar (61).

3. The single-sided heat-bonded insulating layer enameled wire for power transformer according to claim 2, characterized in that: The bottom of the fixing ring (61) is fixedly connected to the diamond-shaped thermal adhesive layer (5), and the bottom of the connecting ring (62) is adhesively connected to the external insulating layer (7).

4. The single-sided heat-bonded insulating layer enameled wire for power transformer according to claim 3, characterized in that: The outer wall of the fixing collar (61) is fixedly connected with a clamping block (63), the bottom of the inner wall of the connecting collar (62) is provided with an arc groove (65), and the outer wall of the clamping block (63) is slidably clamped in the inner part of the arc groove (65).

5. The single-sided heat-bonded insulating layer enameled wire for power transformer according to claim 4, characterized in that: The connecting ring (62) is provided with a slide groove (64) matching the clamping block (63) inside, the inner cavity of the slide groove (64) is communicated with the inner cavity of the circular arc groove (65), and one side of the inner cavity of the circular arc groove (65) is filled with an insulator for limiting the clamping block (63).

6. The single-sided heat-bonded insulating layer enameled wire for power transformer according to claim 5, characterized in that: A mounting hole (66) is provided at the top of the connecting ring (62); a mounting sleeve (67) is fixedly sleeved in the inner cavity of the mounting hole (66); one end of the outer wall of the mounting sleeve (67) is fixedly connected to a limit block (68); and the outer wall of the limit block (68) and one end of the outer wall of the mounting sleeve (67) are embedded in the interior of the external insulating layer (7).

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