An induction coil of an insulating part

Abstract

The present invention provides an induction coil for an insulating component, belonging to the technical field of power equipment. It solves the problem that existing insulating components are prone to failing to meet local discharge performance standards. The induction coil of the insulating component comprises a cylinder having a plurality of through-holes disposed on its side wall. The cylinder is made of semi-conductive silicone rubber, and the outer surface of the cylinder has a plurality of annular convex rings disposed around the outer circumference of the cylinder. The convex rings are arranged sequentially from one end of the cylinder to the other, and the through-holes are disposed on the side wall of the cylinder between the convex rings. This induction coil structure makes it easier for the insulating component to meet local discharge performance standards during processing and use.

Description

Technical Field

[0001] The invention belongs to the technical field of electric power equipment and relates to an induction coil of an insulating part. Background Art

[0002] Solid insulators are an insulating component in electrical equipment. They consist of a housing made of epoxy resin insulation material, within which an induction coil is installed to provide uniform electric field shielding and improve the insulator's partial discharge characteristics. Chinese patent literature has publicly proposed an insulator [Application Number: CN201720585118.4; Publication Number: 206742587U] comprising a body within which high- and low-voltage shielding meshes are installed. These meshes, which serve as the induction coils, ensure that all live components within them are at the same potential, preventing discharges from these components that could cause the insulator to fail partial discharge tests.

[0003] Induction coils are typically made of conductive metal materials, such as copper, aluminum, or stainless steel. During the insulation processing, the induction coil is placed in a mold, and then epoxy resin is poured through the mold to form the induction coil. After pouring, the induction coil is fixed within the housing. However, the adhesion between the metal and epoxy resin materials is poor, and the expansion coefficients differ significantly. After the insulation component, which has been cast under high temperature conditions, cools, significant stress is generated between the induction coil and the housing. This can easily lead to interfacial cracking, peeling gaps, internal voids, and other gap defects. This can easily lead to partial discharge failure of the insulation component and degrade the insulation. Summary of the Invention

[0004] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and to propose an induction coil for an insulating part, thereby solving the technical problem that the partial discharge performance of the existing insulating part is easily unqualified.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] An induction coil of an insulating part includes a cylinder, and a plurality of through holes are provided on the side wall of the cylinder. The invention is characterized in that the cylinder is made of semi-conductive silicone rubber, and an annular convex ring is provided on the outer surface of the cylinder around the outer circumference of the cylinder. There are several convex rings and they are arranged in sequence from one end of the cylinder to the other end. The through holes are provided on the side wall of the cylinder between the convex rings.

[0007] Semi-conductive silicone rubber is silicone rubber with conductive fillers added, resulting in conductive properties while retaining the properties of silicone rubber. The barrel is made of semi-conductive silicone rubber, while the shell is made of epoxy resin. This leverages the properties of the semi-conductive silicone rubber to reduce the gap between the barrel and shell, making it easier for the insulator to meet the required partial discharge performance requirements. The presence of several raised rings enhances the structural strength of the barrel, preventing deformation of the semi-conductive silicone rubber barrel during the casting process, which could affect the insulator's partial discharge performance. Through-holes are located in the sidewall of the barrel between the raised rings, preventing damage to the rings and ensuring their structural reinforcement, ensuring the stability of the insulator's partial discharge performance during processing and use. This induction coil is made of semi-conductive silicone rubber and features several raised rings on the outer side of the barrel. The through-holes are located in the sidewall between the raised rings, improving the bond between the induction coil and shell while also increasing the structural strength of the barrel. This integrated structure of the induction coil makes it easier for the insulator to meet the required partial discharge performance requirements during processing and use.

[0008] In the aforementioned induction coil of the insulating component, a through hole is provided between each protruding ring and the adjacent protruding ring on the side wall of the cylindrical body. After the epoxy resin is poured, the through hole forms a connecting column, stably connecting the induction coil to the housing. During the pouring process, the epoxy resin flows into the through hole. The through hole between each protruding ring and the adjacent protruding ring on the side wall of the cylindrical body prevents the epoxy resin from forming cavities between two adjacent protruding rings during the pouring process, making it easier for the insulating component to meet qualified partial discharge performance.

[0009] In the aforementioned induction coil of the insulating component, the outer side surface of the convex ring is arc-shaped. This can reduce stress at the interface between the convex ring and the shell, reduce the generation of gaps, and ensure that the convex ring does not affect the connection between the cylinder and the shell, ensuring that the partial discharge performance of the insulating component is more easily qualified.

[0010] In the induction coil of the insulating member, the outer surface of the cylinder further comprises a protruding convex strip, and the convex strip is intersected with at least two convex rings.

[0011] The convex strips connect the convex rings to each other, which can further improve the structural strength of the cylinder, and can further prevent the cylinder made of semi-conductive silicone rubber from being deformed during the casting process of the insulating part, thereby affecting the partial discharge performance of the insulating part, making it easier for the partial discharge performance of the insulating part to pass.

[0012] In the aforementioned induction coil of the insulating component, the ridges are multiple and arranged sequentially along the outer circumference of the cylinder. Connecting the ridges with more ridges further enhances the structural strength of the cylinder, preventing deformation of the semi-conductive silicone rubber cylinder during the molding process of the insulating component, which could affect the insulating component's partial discharge performance. This makes it easier for the insulating component to meet qualified partial discharge performance standards.

[0013] In the induction coil of the insulating member described above, the outer surface of the cylinder is provided with at least one through hole in a grid unit formed by the convex ring and the convex strip.

[0014] Through holes are provided in the lattice units surrounded by the convex rings and the convex strips. The epoxy resin will flow into the through holes during the pouring process, which can prevent the epoxy resin from forming cavities in the lattice units during the pouring process, making it easier for the partial discharge performance of the insulating component to meet the requirements.

[0015] In the aforementioned induction coil of the insulating component, the outer surface of the convex strip and the outer surface of the convex ring form an arc transition. This reduces stress between the transition between the convex strip and the convex ring and the interface with the housing, ensuring that the convex strip and the convex ring do not affect the connection between the cylinder and the housing, thereby ensuring that the partial discharge performance of the insulating component is more easily qualified.

[0016] In the induction coil of the above-mentioned insulating part, both ends of the cylinder are open, and the port side walls at both ends of the cylinder have convex edges protruding outward, the convex strips extend to intersect with at least one convex edge, and the outer surface of the cylinder has at least one through hole in the lattice unit surrounded by the convex ring, the convex edge and the convex strips.

[0017] The ridges provided on the sidewalls of the barrel's port enhance the structural strength of the barrel's port, preventing deformation of the semi-conductive silicone rubber end of the barrel during the casting process of the insulating component, which could affect the insulating component's partial discharge performance and make it easier for the insulating component to meet qualified partial discharge performance standards. The ridges extending to the ridges further enhance the structural strength of the barrel's port. Through-holes are also provided in the grid cells formed by the ridges, ridges, and ridges to prevent the epoxy resin from forming cavities between the ridges and ridges during the casting process, making it easier for the insulating component to meet qualified partial discharge performance standards.

[0018] In the induction coil of the insulating member, a protruding connecting portion is provided on the outer surface of the cylinder, and a connecting member is fixed on the connecting portion. The provision of the connecting member facilitates the installation of other components in the insulating member.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] The barrel is made of semi-conductive silicone rubber, giving it both silicone rubber properties and electrical conductivity. The outer surface of the barrel features a protruding annular ring, with through-holes located in the barrel's sidewall between the rings, making it easier for the insulator to pass partial discharge testing. The outer surface of the barrel also features raised ridges, with through-holes located in the grid cells formed by the rings and ridges, further enhancing the insulator's partial discharge performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional diagram of this induction coil;

[0022] Figure 2 It is a cross-sectional view of the induction coil;

[0023] Figure 3 yes Figure 2 Left view of .

[0024] In the figure, 1 is the cylinder; 1a is the through hole; 1b is the convex ring; 1c is the convex strip; 1d is the convex edge; 1e is the connecting part; 2 is the connecting piece. DETAILED DESCRIPTION

[0025] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0026] Example 1

[0027] like Figure 1-Figure 3 As shown, an induction coil of an insulating part includes a cylindrical barrel 1, which is made of semi-conductive silicone rubber. Both ends of the barrel 1 are open, and the side walls of the ports at both ends of the barrel 1 have an annular convex edge 1d protruding outward. A protruding connecting portion 1e is provided on the outer surface of the barrel 1, and a connecting hole is provided on the connecting portion 1e. A connecting member 2 is fixed in the connecting hole, and a threaded hole is provided on the outer end surface of the connecting member 2. Several through holes 1a are provided on the side wall of the barrel 1, and the axis of the through hole 1a is perpendicular to the axis of the barrel 1. The barrel 1 has an imaginary plane passing through the axis of the barrel 1, and the connecting holes are perpendicular to the imaginary plane. The axes of some through holes 1a are located on the imaginary plane, and the axes of the remaining through holes 1a are perpendicular to the imaginary plane. This arrangement facilitates the molding of the induction coil.

[0028] The outer surface of the cylinder 1 is provided with an annular raised ring 1b extending around its circumference. The outer surface of the raised ring 1b is arc-shaped. There are several raised rings 1b arranged sequentially from one end of the cylinder 1 to the other. Some through-holes 1a are provided on the sidewall of the cylinder 1 between the raised rings 1b, while others are provided between the raised rings 1b and the raised rims 1d. Each raised ring 1b on the sidewall of the cylinder 1 has a through-hole 1a between it and the adjacent raised ring 1b, and each raised rim 1d on the sidewall of the cylinder 1 has a through-hole 1a between it and the adjacent raised ring 1b. The outer surface of the cylinder 1 also has a raised ridge 1c extending axially along the cylinder 1. The ridge 1c intersects at least two of the raised rings 1b and extends to intersect at least one of the raised rims 1d. The outer portion of the ridge 2 protrudes beyond the outer surface of the raised ring 1b with which it intersects, thereby further enhancing the structural strength of the cylinder 1. There are several ridges 1c arranged sequentially along the outer circumference of the cylinder 1. The outer surface of the cylinder 1 has at least one through-hole 1a within the lattice unit formed by the raised ring 1b and ridges 1c. The outer surface of the cylinder 1 also has at least one through-hole 1a within the lattice unit formed by the raised ring 1b, raised edge 1d, and ridges 1c. The outer side of the ridges 1c transitions to the outer side of the raised ring 1b in a circular arc, and the outer side of the ridges 1c transitions to the outer side of the raised edge 1d in a circular arc. The number of through-holes 1a, raised ring 1b, and ridges 1c can be adjusted as needed.

[0029] Semi-conductive silicone rubber is a common material that has conductive fillers added to silicone rubber, so that the semi-conductive silicone rubber has conductive properties while maintaining the properties of silicone rubber. The conductive fillers can be metallic conductive materials, such as silver powder, nickel powder, copper powder, etc., or non-metallic conductive materials, such as stone powder, carbon black, etc. The cylinder 1 is made of semi-conductive silicone rubber, and the shell is made of epoxy resin. In this way, the properties of silicone rubber in the semi-conductive silicone rubber can be used to reduce the gap between the joint surface of the cylinder 1 and the shell, making it easier for the local discharge performance of the insulating part to pass. The provision of the convex edge 1d, the convex ring 1b and the convex strip 1c can improve the structural strength of the cylinder 1, and prevent the cylinder 1 made of semi-conductive silicone rubber from being deformed during the casting and molding of the insulating part, thereby affecting the local discharge performance of the insulating part. After the epoxy resin is cast, the through hole 1a will form a connecting column, which makes the induction coil stably connected to the shell. During the pouring process, epoxy resin flows into through-holes 1a. The through-holes 1a provided on the sidewall of the barrel 1 also prevent the epoxy resin from forming cavities between two adjacent protruding rings 1b during pouring, making it easier for the insulator to meet the partial discharge performance requirements. The integrated structure of the induction coil makes it easier for the insulator to meet the partial discharge requirements during processing and use.

[0030] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. An induction coil of an insulating member, comprising a cylinder (1), wherein a plurality of through holes (1a) are provided on the side wall of the cylinder (1), characterized in that: The cylinder (1) is made of semi-conductive silicone rubber. The outer surface of the cylinder (1) has an annular convex ring (1b) arranged around the outer circumference of the cylinder (1). There are several convex rings (1b) and they are arranged in sequence from one end to the other end of the cylinder (1). The through hole (1a) is arranged on the side wall of the cylinder (1) between the convex rings (1b). The outer side surface of the convex ring (1b) is in the shape of an arc. The outer surface of the cylinder (1) also has a protruding convex strip (1c) arranged along the axial direction of the cylinder (1). The convex strip (1c) is arranged to intersect with at least two convex rings (1b). There are several convex strips (1c) and they are arranged in sequence along the outer circumference of the cylinder (1). The convex rings (1b) and the convex strips (1c) form a lattice unit.

2. The induction coil of the insulating member according to claim 1, characterized in that: The through hole (1a) is provided between each convex ring (1b) and the adjacent convex ring (1b) on the side wall of the cylinder (1).

3. The induction coil of the insulating member according to claim 1 or 2, characterized in that: The outer surface of the cylinder (1) is provided with at least one through hole (1a) in a lattice unit formed by the convex ring (1b) and the convex strip (1c).

4. The induction coil of the insulating member according to claim 1 or 2, characterized in that: There is an arc transition between the outer side surface of the convex strip (1c) and the outer side surface of the convex ring (1b).

5. The induction coil of the insulating member according to claim 1 or 2, characterized in that: Both ends of the cylinder (1) are open, and the side walls of the ports at both ends of the cylinder (1) are provided with outwardly protruding ridges (1d), and the ridges (1c) extend to intersect with at least one ridge (1d). The outer surface of the cylinder (1) is provided with at least one through hole (1a) in a grid unit formed by the ridge (1b), the ridge (1d) and the ridges (1c).

6. The induction coil of the insulating member according to claim 1 or 2, characterized in that: A protruding connecting portion (1e) is also provided on the outer surface of the cylinder (1), and a connecting piece (2) is fixed on the connecting portion (1e).

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