A multi-layer composite high-voltage bushing

Abstract

The present invention discloses a multi-layer composite high-voltage bushing, which comprises a copper rod, conductive ink, a silicone tube, a stainless steel metal mesh, and an epoxy resin from the inside to the outside. The silicone tube is sleeved on the middle section of the copper rod, and the conductive ink is coated between the contact surface of the silicone tube and the copper rod; the epoxy resin wraps the silicone tube and the copper rod; the outer layer of the epoxy resin is provided with a fixed end, and the stainless steel metal mesh is provided between the epoxy resin and the fixed end. This avoids the copper rod and the epoxy resin from expanding or contracting to different degrees, which causes stress concentration in the composite material under temperature changes, causing cracks, peeling or deformation, and brings better prospects for use.

Description

Technical Field

[0001] The invention belongs to the technical field of electric power equipment, and in particular relates to a multi-layer composite high-voltage bushing. Background Art

[0002] Epoxy bushings play a very important role in the power system, and are responsible for transmitting electric energy and providing insulation protection. Currently, epoxy bushings on the market are basically produced by directly pouring epoxy resin on the outside of copper rods. However, due to the mismatch in thermal expansion coefficients of the two: copper and epoxy resin have different thermal expansion coefficients. As the temperature changes, the two will expand or contract to varying degrees, which may cause stress concentration in the composite material under temperature changes, causing cracks, peeling or deformation. In this regard, we propose a multi-layer composite high-voltage bushing. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a multi-layer composite high-voltage bushing, which solves the problem of cracks, peeling and deformation during casting production and use.

[0004] To achieve the above object, the present invention provides the following technical solution: a multi-layer composite high-voltage bushing, comprising, from inside to outside, a copper rod, conductive ink, a silicone tube, a stainless steel metal mesh, and an epoxy resin, wherein the silicone tube is sleeved on the middle section of the copper rod, and the conductive ink is coated between the contact surface of the silicone tube and the copper rod; the epoxy resin wraps the silicone tube and the copper rod; the outer layer of the epoxy resin is provided with a fixed end, and the stainless steel metal mesh is provided between the epoxy resin and the fixed end;

[0005] An extrusion cavity is provided inside the epoxy resin, a connection structure is fixedly connected inside the extrusion cavity, a blocking structure is fixedly connected inside the extrusion cavity, the connection structure comprises a first connection block, the first connection block is fixedly connected to the inner wall of the extrusion cavity, a spring telescopic cylinder and a rubber block are fixedly connected to the outer side surface of the first connection block, and the spring telescopic cylinder is located inside the rubber block;

[0006] The blocking structure comprises a blocking cover, the outer side of the blocking cover is fixedly connected to a second connection block, the inner side of the blocking cover is fixedly connected to an insert block, the inner side of the blocking cover is fixedly connected to a sealing plug, the size of the sealing plug matches the size of the extrusion cavity, and a cavity is opened inside the insert block;

[0007] The inner wall of the plug block is fixedly connected to a fixing plate, the outer side surface of the fixing plate is fixedly connected to a slider, the outer side surface of the slider is slidably connected to a connecting plate, the outer side surface of the connecting plate is fixedly connected to a spring, the spring is located between the connecting plates, the outer side surface of the connecting plate is fixedly connected to a card block, the plug block is provided with a slot for the card block to pass through, the inner wall of the epoxy resin is provided with a card groove, and the card groove matches the card block.

[0008] A silicone tube is set between copper and epoxy resin and conductive ink is applied to increase structural strength and improve service life. This prevents the different thermal expansion coefficients of copper and epoxy resin, which cause the two to expand or contract to different degrees as the temperature changes, resulting in stress concentration in the composite material under temperature changes, causing cracks, peeling or deformation.

[0009] Preferably, the diameter of the copper rod is 23mm-50mm, the copper rod is the center of the multi-layer composite high-voltage bushing, and the processing technology of the copper rod is: spraying 100# glass sand on the outer circle to form a matte surface, and both ends of the copper rod have M16 screw holes.

[0010] Preferably, the surface resistance of the conductive ink is lower than 2000Ω, and the inner diameter of the silicone tube is 3mm-5mm smaller than the diameter of the copper rod.

[0011] Preferably, the rubber block is made of rubber material, and a spring block is arranged inside the spring telescopic cylinder.

[0012] Preferably, the sealing plug is made of sealant, and the second connecting block is provided with an anti-slip pad.

[0013] Preferably, the connecting plate is provided with a slot for the sliding block to slide, the spring slides in the sliding block, and the connecting plates are in two groups.

[0014] Preferably, one end of the insert block is conical, and the outer surface of the clamping block is polished with an arc.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention leaves an extrusion cavity on the inner wall of the epoxy resin in advance during the pouring process, so that the epoxy resin reserves a space for bearing extrusion during the pouring process, and can generate air flow through communication with the outside, thereby reducing the temperature difference. After the pouring is completed, the reserved cavity is blocked by using a blocking structure for use, thereby avoiding different degrees of expansion or contraction of the copper rod and the epoxy resin, resulting in stress concentration of the composite material under temperature changes, causing cracks, peeling or deformation, and bringing better use prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the cross-sectional structure in Example 1 of the present invention;

[0018] Figure 2 It is a schematic diagram of the structure of the present invention;

[0019] Figure 3 It is an internal structure analysis diagram of the present invention;

[0020] Figure 4 For the present invention Figure 2 The enlarged analysis diagram at A in the middle;

[0021] Figure 5 For the present invention Figure 2 The enlarged analysis diagram at B in the middle;

[0022] Figure 6 It is a schematic diagram of the connecting plate structure of the present invention.

[0023] In the figure: 1. epoxy resin; 2. connection structure; 3. stainless steel metal mesh; 4. conductive ink; 5. silicone tube; 6. sealing structure; 7. copper rod; 8. extrusion cavity; 21. first connection block; 22. rubber block; 23. spring telescopic cylinder; 61. sealing plug; 62. second connection block; 63. sealing cover; 64. card block; 65. card slot; 66. plug block; 67. connection plate; 68. spring; 69. slider; 610. fixing plate. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Example 1

[0026] The present invention provides a technical solution: Figure 1 , 2 As shown, a multi-layer composite high-voltage bushing includes, from inside to outside, a copper rod 7, a conductive ink 4, a silicone tube 5, a stainless steel metal mesh 3, and an epoxy resin 1. The silicone tube 5 is sleeved on the middle section of the copper rod 7, and the conductive ink 4 is coated between the contact surface of the silicone tube 5 and the copper rod 7; the epoxy resin 1 wraps the silicone tube 5 and the copper rod 7; the outer layer of the epoxy resin 1 is provided with a fixed end, and the stainless steel metal mesh 3 is provided between the epoxy resin 1 and the fixed end.

[0027] The multilayer composite high-voltage bushing of the present invention is provided with a silicone tube between copper and epoxy resin and coated with conductive ink, so as to increase the structural strength and prolong the service life, and prevent the stress concentration of the composite material under temperature change, which causes cracks, peeling or deformation due to the different thermal expansion coefficients of copper and epoxy resin, and the different expansion or contraction of the two with the change of temperature.

[0028] Example 2

[0029] The present invention provides a technical solution: Figures 2 to 6 As shown, a multi-layer composite high-voltage bushing includes, from inside to outside, a copper rod 7, a conductive ink 4, a silicone tube 5, a stainless steel metal mesh 3, and an epoxy resin 1. An extrusion cavity 8 is provided inside the epoxy resin 1. A connection structure 2 is fixedly connected inside the extrusion cavity 8. A blocking structure 6 is fixedly connected inside the extrusion cavity 8. By leaving an extrusion cavity 8 on the inner wall of the epoxy resin 1 in advance during the pouring process, the epoxy resin 1 is provided with a space for bearing extrusion during the pouring process, and air flow can be generated by circulating with the outside to reduce the temperature difference. After the pouring is completed, the blocking structure 6 is used to block the reserved cavity, and the copper rod 7 and the epoxy resin 1 are prevented from expanding or contracting to different degrees, resulting in stress concentration of the composite material under temperature changes, causing cracks, peeling or deformation, thereby bringing better prospects for use.

[0030] Copper rod 7 has good electrical conductivity, thermal conductivity, corrosion resistance and processing properties, can be welded and brazed, has a hard texture, 5 to 40 mm, contains less impurities with low electrical conductivity and thermal conductivity, and a trace amount of oxygen has little effect on electrical conductivity, thermal conductivity and processing properties, but it is easy to cause "hydrogen disease" and is not suitable for processing and use in a high temperature (such as > 370 ° C) reducing atmosphere;

[0031] Conductive ink 4, a paste ink made of conductive materials, such as gold, silver, copper and carbon, dispersed in a binder, commonly known as paste ink, has a certain degree of conductive properties and can be used for printing conductive dots or conductive lines. Gold conductive ink, silver conductive ink, copper conductive ink, carbon conductive ink, etc. have reached practical use and are used for printed circuits, electrodes, electroplating base layers, keyboard contacts, printed resistors and other materials;

[0032] Epoxy resin 1 is a high molecular polymer with the molecular formula (C11H12O3)n. It refers to a class of polymers containing two or more epoxy groups in the molecule. It is the condensation product of epichlorohydrin and bisphenol A or polyols. Due to the chemical activity of the epoxy group, it can be opened with a variety of compounds containing active hydrogen, cured and cross-linked to form a network structure. Therefore, it is a thermosetting resin. Bisphenol A type epoxy resin 1 not only has the largest output and the most complete varieties, but also new modified varieties are still increasing and the quality is constantly improving.

[0033] The connection structure 2 includes a first connection block 21 , which is fixedly connected to the inner wall of the extrusion cavity 8 . A spring telescopic tube 23 and a rubber block 22 are fixedly connected to the outer side of the first connection block 21 . The spring telescopic tube 23 is located inside the rubber block 22 .

[0034] like Figure 2 , Figure 4 and Figure 5 As shown, the blocking structure 6 includes a blocking cover 63, the outer side surface of the blocking cover 63 is fixedly connected to the second connecting block 62, the inner side surface of the blocking cover 63 is fixedly connected to the plug block 66, the inner side surface of the blocking cover 63 is fixedly connected to the sealing plug 61, the size of the sealing plug 61 matches the size of the extrusion cavity 8, a cavity is opened inside the plug block 66, the inner wall of the plug block 66 is fixedly connected to a fixing plate 610, the outer side surface of the fixing plate 610 is fixedly connected to a slider 69, the outer side surface of the slider 69 is slidably connected to a connecting plate 67, the outer side surface of the connecting plate 67 is fixedly connected to a spring 68, the spring 68 is located between the connecting plates 67, the outer side surface of the connecting plate 67 is fixedly connected to a card block 64, the plug block 66 is opened with a slot for the card block 64 to pass through, the inner wall of the epoxy resin 1 is opened with a card slot 65, the card slot 65 matches the card block 64, the card block 64 and the card slot 65 are connected There are four groups of them. The outer surface of the card block 64 is smooth to reduce friction and facilitate insertion. After the pouring is completed, the card block 66 is aligned with the extrusion cavity 8, and the card block 64 is contracted in the internal cavity of the card block 66 under the action of the spring 68. At this time, the card block 66 is forcefully inserted into the extrusion cavity 8. As the card block 66 continues to go deeper, the front end of the card block 66 will first reach the card slot 65, but the rear end of the card block 66 is still in the extrusion cavity 8 and is squeezed, causing the front end of the card block 66 to also shrink and be unable to extend. When the rear end of the card block 66 is also inserted into the card slot 65, the spring 68 is naturally extended without the extrusion of external force, and drives the card block 64 to be stuck in the card slot 65 for fixed limit, so that the blocking cover 63 completely blocks the extrusion cavity 8 and seals the extrusion cavity 8 left in advance.

[0035] like Figures 1 to 5As shown, the diameter of the copper rod 7 is 23mm-50mm, the copper rod 7 is the center of the multi-layer composite high-voltage bushing, and the processing technology of the copper rod 7 is: 100# glass sand is sprayed on the outer circle to form a matte surface, both ends of the copper rod 7 are provided with M16 screw holes, the surface resistance of the conductive ink 4 is lower than 2000Ω, the inner diameter of the silicone tube 5 is 3mm-5mm smaller than the diameter of the copper rod 7, the rubber block 22 is made of rubber material, a spring block is arranged inside the spring telescopic cylinder 23, the sealing plug 61 is made of sealant, an anti-slip pad is arranged on the second connecting block 62, a notch for the sliding block 69 to slide is opened on the connecting plate 67, the spring 68 slides in the sliding block 69, the number of connecting plates 67 is two groups, one end of the plug 66 is conical, and the outer surface of the clamping block 64 is polished with an arc.

[0036] How it works

[0037] During the pouring process, an extrusion cavity 8 is reserved inside the mold. When the epoxy resin 1 is poured, a cavity is left inside the epoxy resin 1, and a spring telescopic tube 23 and a rubber block 22 are fixedly connected to the inner wall of the extrusion cavity 8. During the pouring, under the action of the expansion coefficient, an extrusion force is generated to allow the copper rod 7 to extrude the epoxy resin 1. Under the action of the extrusion cavity 8, the deformation of the epoxy resin 1 is small, and the gas can flow with the outside. After the pouring is completed, by aligning the plug block 66 at the extrusion cavity 8, the card block 64 is contracted in the internal cavity of the plug block 66 under the action of the spring 68. At this time, the plug block 66 is forcefully inserted into the interior of the extrusion cavity 8, and as the plug block 66 continues to go deeper, the front end of the plug block 66 will reach the card slot 65 first, but the rear end of the plug block 66 is still in the extrusion cavity 8 at this time and is squeezed, causing the front end of the plug block 66 to also shrink and cannot When the plug 66 at the rear end is also inserted into the interior of the card slot 65, the spring 68 naturally extends out without the extrusion of external force, and drives the card block 64 to be stuck in the interior of the card slot 65 for fixed limiting, so that the blocking cover 63 completely blocks the extrusion cavity 8, and the extrusion cavity 8 left in advance is sealed. The processing is completed and it can be used. By leaving the extrusion cavity 8 on the inner wall of the epoxy resin 1 in advance during the pouring process, the epoxy resin 1 is allowed to reserve space for extrusion during the pouring process, and through circulation with the outside world, air flow can be generated to reduce the temperature change difference. After the pouring is completed, the reserved cavity is blocked by using the blocking structure 6 for use, which avoids the copper rod 7 and the epoxy resin 1 from expanding or contracting to different degrees, resulting in stress concentration of the composite material under temperature changes, causing cracks, peeling or deformation, and bringing better use prospects.

[0038] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0039] 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 multi-layer composite high-voltage bushing, characterized in that: The invention comprises, from the inside to the outside, a copper rod (7), conductive ink (4), a silicone tube (5), a stainless steel metal mesh (3), and an epoxy resin (1), wherein the silicone tube (5) is sleeved on the middle section of the copper rod (7), and the conductive ink (4) is coated between the contact surface of the silicone tube (5) and the copper rod (7); the epoxy resin (1) wraps the silicone tube (5) and the copper rod (7); the outer layer of the epoxy resin (1) is provided with a fixed end, and the stainless steel metal mesh (3) is provided between the epoxy resin (1) and the fixed end; An extrusion cavity (8) is provided inside the epoxy resin (1), a connection structure (2) is fixedly connected inside the extrusion cavity (8), and a blocking structure (6) is fixedly connected inside the extrusion cavity (8). The connection structure (2) comprises a first connection block (21), the first connection block (21) is fixedly connected to the inner wall of the extrusion cavity (8), a spring telescopic cylinder (23) and a rubber block (22) are fixedly connected to the outer side surface of the first connection block (21), and the spring telescopic cylinder (23) is located inside the rubber block (22); The blocking structure (6) comprises a blocking cover (63), the outer side surface of the blocking cover (63) being fixedly connected to a second connection block (62), the inner side surface of the blocking cover (63) being fixedly connected to an insert block (66), the inner side surface of the blocking cover (63) being fixedly connected to a sealing plug (61), the size of the sealing plug (61) being matched to the extrusion cavity (8), and a cavity being provided inside the insert block (66); The inner wall of the plug block (66) is fixedly connected to a fixing plate (610), the outer side surface of the fixing plate (610) is fixedly connected to a slider (69), the outer side surface of the slider (69) is slidably connected to a connecting plate (67), the outer side surface of the connecting plate (67) is fixedly connected to a spring (68), the spring (68) is located between the connecting plates (67), the outer side surface of the connecting plate (67) is fixedly connected to a clamping block (64), the plug block (66) is provided with a slot for the clamping block (64) to pass through, and the inner wall of the epoxy resin (1) is provided with a clamping groove (65), the clamping groove (65) matches the clamping block (64).

2. The multilayer composite high voltage bushing according to claim 1, characterized in that: The diameter of the copper rod (7) is 23 mm-50 mm. The copper rod (7) is the center of the multi-layer composite high-voltage bushing. The processing technology of the copper rod (7) is as follows: spraying 100# glass sand on the outer circle to form a matte surface. Both ends of the copper rod (7) are provided with M16 screw holes.

3. The multilayer composite high voltage bushing according to claim 1, characterized in that: The surface resistance of the conductive ink (4) is lower than 2000Ω, and the inner diameter of the silicone tube (5) is 3 mm to 5 mm smaller than the diameter of the copper rod (7).

4. The multilayer composite high voltage bushing according to claim 1, characterized in that: The rubber block (22) is made of rubber material, and a spring block is arranged inside the spring telescopic cylinder (23).

5. The multilayer composite high voltage bushing according to claim 1, characterized in that: The sealing plug (61) is made of sealant, and the second connecting block (62) is provided with an anti-slip pad.

6. The multilayer composite high voltage bushing according to claim 1, characterized in that: The connecting plate (67) is provided with a slot for the sliding block (69) to slide, and the spring (68) slides in the sliding block (69). The connecting plates (67) are provided in two groups.

7. The multi-layer composite high voltage bushing according to claim 1, characterized in that: One end of the insert block (66) is conical, and the outer surface of the clamping block (64) is polished to have an arc.

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