CN216849502U

CN216849502U - Gas insulation system and insulator assembly

Info

Publication number: CN216849502U
Application number: CN202122776909.4U
Authority: CN
Inventors: 农结神; 陈天送; 陈龙光; 王文勇; 刘罗鹏
Original assignee: Hitachi Energy Switzerland AG
Current assignee: Hitachi Energy Co ltd
Priority date: 2021-11-12
Filing date: 2021-11-12
Publication date: 2022-06-28
Anticipated expiration: 2031-11-12
Also published as: WO2023084059A1; WO2023084059A9

Abstract

The utility model provides a gas insulation system and an insulator assembly. The gas insulation system comprises: a housing; an insulator assembly disposed within the housing and comprising: an insulator including a central portion and a leg portion extending outwardly from the central portion; and a connecting member having a cylindrical shape and provided to surround the insulator, the leg portion being connected to the connecting member; wherein the connecting member includes a radially outwardly projecting protrusion fixed to the housing and abutting an inner surface of the housing when fixed to the housing. The gas insulation system according to the present invention fixes the insulator directly to the housing by the connecting member, and has a short dimensional chain and a small assembly tolerance.

Description

Gas insulation system and insulator assembly

Technical Field

The present invention relates generally to gas insulation systems, and more particularly to gas insulation systems and insulator assemblies for gas insulation systems.

Background

Generally, gas insulation system bagIncluding housings and electrical devices/components. The housing may define an enclosed space and be filled with, for example, SF₆The insulating gas of (1). Electrical equipment/components such as circuit breakers, disconnectors, conductor tubes, etc. may be housed in the enclosed space for safe electrical operation. Common gas-insulated systems include, for example, gas-insulated switchgear (GIS) and gas-insulated transmission lines (GIL).

Gas insulated transmission lines generally comprise a hollow cylindrical housing, a conductor tube arranged in the centre of the housing, and an insulator electrically insulating the conductor tube from the housing. An insulator is disposed within the housing and supports the conductor tube.

With regard to the mounting of the insulator within the housing, in some prior art solutions, the free end of the insulator may be welded directly to the housing or may be screwed to a boss on the inner surface of the housing by means of a connecting plate. In the former case, weld spatter may contaminate the internal surfaces of, for example, insulators, conductor tubes and housings, requiring complex measures to avoid or eliminate such contamination. In the latter case, the gap fluctuation between the connection plate and the boss of the case is large because of a large manufacturing tolerance (e.g., a welding tolerance of the boss on the case). If the gap is too small, the web and housing can become scratched during assembly and it can be difficult to align the bolt holes on the web and housing bosses.

SUMMERY OF THE UTILITY MODEL

The present invention aims to solve the above-mentioned problems of the prior art and to provide an improved gas insulation system.

To this end, a first aspect of the utility model provides a gas insulation system. The gas insulation system comprises: a housing; an insulator assembly disposed within the housing and comprising: an insulator including a central portion and a leg portion extending outwardly from the central portion; and a connecting member having a cylindrical shape and disposed to surround the insulator, the leg portion being connected to the connecting member; wherein the connecting member includes a radially outwardly projecting tab that is fixed to the housing and abuts an inner surface of the housing when fixed to the housing.

The gas insulation system according to the present invention directly fixes the insulator to the housing through the connecting member, and has a short dimensional chain and a small assembly tolerance. Also, the connecting member can be formed with a small manufacturing tolerance by machining to have an accurate size, thereby helping to ensure that the connecting member can be spaced apart from the inner surface of the case when assembled, so that fastening points (e.g., fastening holes) on the connecting member and the case can be easily aligned and scraping of the connecting member from the case to produce undesirable particles can be avoided.

The first aspect of the present invention may further include any one or more of the following alternatives according to the above technical idea.

In some alternatives, the leg is embedded at its ends with metal inserts that are connected to the connecting member.

In some alternatives, the tab is fixed to the housing at an end thereof.

In some alternatives, the housing includes a cylindrical section and a flange section connected to an end of the cylindrical section, the projection being secured to the flange section.

In some alternatives, the connecting member includes a connecting body in a cylindrical shape, the projection projects radially outward from the connecting body and includes a first flat portion, and the inner surface of the housing includes a planar portion; wherein the first flat plate portion abuts the flat surface portion when the protrusion is fixed to the housing.

In some alternatives, the peripheral wall of the connecting body includes a second plate portion, the metal insert being connected to the second plate portion.

In some alternatives, at least one of the first plate portion, the planar portion, and the second plate portion is shaped by machining. In this way, the first plate portion, the planar portion and the second plate portion fastening plane can each be formed with a small manufacturing tolerance, which also contributes to a reduction in assembly tolerances.

In some alternatives, the peripheral wall of the connecting body is integrated with a particle trap.

In some alternatives, the protrusion includes a first fastening hole for fastening the protrusion to the housing by a first fastener, the connection member includes a second fastening hole for fastening the metal insert to the connection member by a second fastener, and the protrusion is spaced from the second fastening hole in an axial direction of the connection member.

According to a second aspect of the present invention there is provided an insulator assembly for a gas insulation system. The insulator assembly includes: an insulator including a central portion and a leg portion extending outwardly from the central portion; and a connecting member having a cylindrical shape and disposed to surround the insulator, the leg portion being connected to the connecting member; wherein the connection member comprises a radially outwardly protruding protrusion adapted to be fixed to a housing of the gas insulation system and to abut an inner surface of the housing when fixed thereto.

The gas insulation system and the connecting/fastening structure for the insulator in the insulator assembly according to the present invention are simple in structure and easy to control in manufacturing tolerance, can be conveniently assembled and have a low assembly tolerance.

Drawings

Other features and advantages of the present invention will be better understood by the following detailed description of alternative embodiments, taken in conjunction with the accompanying drawings, in which like reference characters designate the same or similar parts, and in which:

fig. 1 is a partial perspective view of a gas insulation system according to an exemplary embodiment of the present invention;

FIGS. 2A and 2B are respectively transverse cross-sectional views of the gas insulation system of FIG. 1 taken along different planes;

FIG. 3 is a partial longitudinal cross-sectional view of the gas insulation system of FIG. 1;

fig. 4A and 4B are a perspective view and a plan view, respectively, of a flange section of a housing of the gas insulation system in fig. 1;

fig. 5A and 5B are perspective views of the connection member of the gas insulation system of fig. 1, respectively, from different angles; and

fig. 6A and 6B are perspective views of the insulator of the gas insulation system of fig. 1, respectively, from different angles.

Detailed Description

The making and using of the embodiments are discussed in detail below. It should be understood, however, that the detailed description discussed is merely exemplary of specific ways to make and use the utility model, and is not intended to limit the scope of the utility model. The directional expressions of the structural positions of the respective components such as upper, lower, top, bottom, etc. in the description are not absolute, but relative. When the respective components are arranged as shown in the drawings, these direction expressions are appropriate, but when the positions of the respective components in the drawings are changed, these direction expressions are changed accordingly.

In the present invention, the axial direction of the cylindrical or annular member means a direction along the central axis of the member, the circumferential direction of the cylindrical or annular member means a direction along the circumferential length of the member, and the radial direction of the cylindrical or annular member means a direction passing through the central axis of the member and perpendicular to the axial direction of the member.

In this context, a gas insulation system refers to the following systems/devices: the system/apparatus includes a metal case for defining a closed space filled with an insulating gas, and an electric device/component accommodated in the metal case. In the following, a gas insulation system and an insulator assembly for a gas insulation system according to the utility model will be discussed by way of example in the GIL. It will be appreciated that the gas insulation system according to the utility model may be in the form of other gas insulation systems, such as GIS, and that the insulator assembly according to the utility model may be applied to other gas insulation systems, such as GIS, to support a busbar thereof.

Fig. 1 shows a section of a gas insulation system 100 according to an exemplary embodiment of the present invention. The gas insulation system 100 is in the form of a GIL. It will be appreciated that GILs are generally of a longer length and may be made up of a plurality of segments of GILs as shown in figure 1. In the illustrated embodiment, the gas insulation system 100 generally includes a housing 102, a conductive tube 104 contained within the housing 102 for carrying electrical current, and an insulator assembly 106 for supporting the conductive tube 104 and insulating the conductive tube 104 from the housing 102.

Referring to fig. 1 to 3, the housing 102 may have a cylindrical shape and an opening 108 at an end thereof. Housing 102 may include a cylindrical section 110 and a flange section 112 connected to an end of cylindrical section 110. Alternatively, the cylindrical section 110 and the flange section 112 may be fixed together by welding. In the illustrated embodiment, the two ends of the cylindrical section 110 are each provided with a flange section 112 for coupling, for example, with the housing of the other section of the GIL.

The conductive tube 104 may be coaxially disposed within the housing 102. Typically, the housing 102 is at ground potential, while the conductive tube 104 is at a relatively high potential, such as a potential in the range of 100kV-1200 kV. The housing 102 and the conductive tube 104 may be made of a metal material such as aluminum, aluminum alloy, and copper.

Referring to fig. 1-2B, an insulator assembly 106 is disposed between the housing 102 and the conductive tube 104 to support the conductive tube 104 within the housing 102. The insulator assembly 106 includes an insulator 114 and a connecting member 116. Insulator 114 includes a central portion 118 and legs 120 extending outwardly from central portion 118. The connecting member 116 has a cylindrical shape and is disposed to surround the insulator 114. The leg 120 of the insulator 114 is connected to the connecting member 116. The connecting member 116 includes a radially outwardly projecting tab 122. The protrusion 122 is fixed to the housing 102 and abuts an inner surface of the housing 102 when fixed to the housing 102.

Referring to fig. 1 to 3 and 6A to 6B, the insulator 114 has a central portion 118 extending along the central axis a and a leg portion 120 extending from the central portion 118 in a radial direction perpendicular to the central axis a. The central portion 118 has an annular shape. The central portion 118 may incorporate a metal sleeve 128. The metal sleeve 128 is configured to receive the conductive tube 104, and the metal sleeve 128 is connected to the conductive tube 104. In the illustrated embodiment, insulator 114 has three legs 120. The legs 120 may be arranged at an angle of 120 ° between two adjacent legs 120. Each leg 120 may be embedded at its end with a metal insert 130 to connect insulator 114 to housing 102 by means of connecting member 116. It is contemplated that insulator 114 may have other suitable numbers of legs 120, such as, for example, two legs 120. The central portion 118 and the leg portions 120 may be made of an insulating material, such as epoxy. The metal insert 130 and the metal sleeve 128 may be made of a metal material, such as aluminum and aluminum alloys.

Referring to fig. 2A to 5B, the connection member 116 may have a cylindrical shape and be disposed to surround the insulator 114. The connecting member 116 may be coaxially disposed within the housing 102.

In the illustrated embodiment, the connecting member 116 includes a generally cylindrical shaped connecting body 132. The protrusion 122 protrudes radially outward from the connection body 132 and includes a first fastening hole 124 for fastening the protrusion 122 to the case 102 by a first fastening member 126. The connecting member 116 may further include a second fastening hole 134 for fastening the metal insert 130 of the insulator 114 to the connecting member 116 by a second fastener 135.

The protrusion 122 may include a first plate portion 136 protruding with respect to the connection body 132. The first plate portion 136 may include the first fastening hole 124. Accordingly, the case 102 includes a third fastening hole 138 corresponding to the first fastening hole 124. The inner surface of the housing 102 may include a recessed planar portion 140. The third fastening hole 138 may be located in the planar portion 140. When the protrusion 122 is secured to the housing 102, the first flat plate portion 136 abuts the flat portion 140. The first fastener 126 may be, for example, a threaded fastener, a rivet, or the like. The first fastener 126 may pass through the first fastener hole 124 into the third fastener hole 138 to secure the protrusion 122 to the case 102. In the illustrated embodiment, the first fastener 126 is in the form of a bolt. Since the first fastening hole 124 is located in the first flat plate portion 136 of the protrusion 122 and the third fastening hole 138 is located in the flat portion 140 of the inner surface of the case 102, when fastening is performed, the head of the first fastening member 126, the first flat plate portion 136 of the protrusion 122, and the flat portion 140 of the inner surface of the case 102 may be closely abutted together with a large contact area to prevent the first fastening member 126 from being loosened, achieving a firm coupling of the protrusion 122 with the case 102. Further, the head of the first fastener 126 is received in the space defined by the protrusion 122 without protruding with respect to the inner circumferential surface of the connection body 132, which may prevent the occurrence of a tip discharge at the head of the first fastener 126.

The protrusion 122 and the second fastening hole 134 may be spaced apart in the axial direction of the connection member 116. Since the insulator 114 is typically disposed at a distance from the end of the housing 102, the spacing of the projections 122 from the second fastening holes 134 allows the projections 122 to be disposed closer to the end of the housing 102 for viewing and aligning the first fastening holes 124 on the projections 122 with the third fastening holes 138 on the housing 102 when fastening, thereby facilitating assembly of the gas insulation system 100, as will be described further below. Alternatively, the protrusion 122 may be fastened at the end of the case 102 so as to facilitate alignment of the fastening hole and fastening operation through the opening 108 at the end of the case 102. In the illustrated embodiment, the protrusion 122 may be secured to the flange section 112.

The connecting member 116 may include a plurality of protrusions 122 spaced apart in a circumferential direction thereof. Each protrusion 122 may include at least one first fastening hole 124. In the illustrated embodiment, the connection member 116 has four protrusions 122, and each protrusion 122 includes two first fastening holes 124. It will be appreciated that the connecting member 116 may have other suitable numbers of projections 122, and that each projection 122 may have other suitable numbers of first fastening holes 124.

Referring to fig. 3-6B, in the illustrated embodiment, the peripheral wall of the connection body 132 may include a second plate portion 144. The second fastening hole 134 may be located in the second plate portion 144. The metal insert 130 of the insulator 114 may have a planar end surface 146. The second fastener 135 may be, for example, a threaded fastener, a rivet, or the like. A second fastener 135 may pass through the second fastening hole 134 into the fourth fastening hole 131 in the metal insert 130 to fix the insulator 114 to the connecting member 116. In the illustrated embodiment, the second fastener 135 may be in the form of a bolt. Since the second fastening holes 134 are located in the second plate portion 144 of the connecting body 132 and the end faces 146 of the metal inserts 130 are planar, when fastening is performed, the heads of the second fastening members 135, the second plate portion 144 of the connecting member 116 and the end faces 146 of the metal inserts 130 can be tightly abutted together with a large contact area, so that the second fastening members 135 are prevented from loosening, and the insulator 114 and the connecting member 116 are firmly coupled.

The connecting body 132 may include a plurality of second plate portions 144 spaced apart in a circumferential direction thereof. Each second plate portion 144 may include at least one second fastening hole 134. In the illustrated embodiment, the connecting body 132 has three second plate portions 144, each second plate portion 144 including four second fastening holes 134. It will be appreciated that the connecting body 132 may have other suitable numbers of second plate portions 144, and that each second plate portion 144 may have other suitable numbers of second fastening holes 134.

At least one of the first plate portion 136, the planar portion 140, and the second plate portion 144 is shaped by machining. Alternatively, the first plate portion 136, the planar portion 140 and the second plate portion 144 may each be formed by machining, such as by stamping, milling, etc., to ensure accuracy thereof, thereby reducing assembly tolerances.

Referring to fig. 1 and 5B, the peripheral wall of the connecting body 132 may be integrated with a particle catcher 150. The particle catcher 150 may be arranged to face the insulator 114 in a radial direction of the connecting member 116, preventing particles inside the housing 102 from adhering to the surface of the insulator 114 causing flashover along the surface of the insulator 114. The particle trap 150 may be in the form of an array of orifices.

The manner of mounting the gas insulation system 100 according to the utility model is described below in connection with fig. 1 to 6B.

First, the insulator 114 may be put into the connecting member 116, and the insulator 114 may be fixed to the connecting member 116 by the second fastener 135. The conductive tube 104 may then be secured to the metal sleeve 128 of the insulator 114.

Then, the insulator 114 and the connecting member 116 assembled together and the conductive pipe 104 are moved into the housing 102 along the axial direction of the housing 102, and the connecting member 116 is adjusted such that the first fastening holes 124 of the connecting member 116 are aligned with the third fastening holes 138 of the housing 102. Wherein the connecting member 116 and the housing 102 may be sized such that the connecting member 116 is spaced apart from the inner surface of the housing 102 when the connecting member 116 is placed in the housing 102, the spacing between the protrusion 122 and the inner surface of the housing 102 may be small.

Finally, the first fastener 126 may be used to fasten the protrusion 122 of the connecting member 116 to, for example, the flange section 112 of the housing 102, during which the connecting member 116 may be deformed slightly such that the protrusion 122 abuts an inner surface of the housing 102 when fastened to the housing 102, thereby securing the insulator 114 to the housing 102 and providing support for the insulator 114.

The connection member 116 may be formed to have an accurate size by machining with a small manufacturing tolerance, thereby ensuring that the connection member 116 can be spaced apart from the inner surface of the case 102 when being put into the case 102, so that the connection member 116 is not scratched from the case 102, and the first fastening holes 124 of the connection member 116 can be easily adjusted to be aligned with the third fastening holes 138 of the case 102. Also, the insulator 114 is directly secured/assembled to the housing 102 by the connecting member 116, and the accumulated assembly tolerances during assembly are small, helping to keep the conductive tube 104 centered within the housing 102.

It should be understood that the various components and features described herein may be made from a variety of materials, including but not limited to polymers, metals, and the like, as well as other suitable materials or combinations of materials known to those skilled in the art. The embodiments shown in fig. 1-6B merely illustrate the shape, size and arrangement of various optional components of the gas insulation system and the insulator assembly according to the present invention, however, they are merely illustrative and not restrictive, and other shapes, sizes and arrangements may be adopted without departing from the spirit and scope of the present invention.

While the technical content and the technical features of the utility model have been disclosed, it is understood that various changes and modifications of the concept disclosed above can be made by those skilled in the art within the spirit of the utility model, and the utility model is covered by the scope of the utility model. The above description of embodiments is intended to be illustrative, and not restrictive, and the scope of the utility model is defined by the appended claims.

Claims

1. A gas insulation system (100), characterized in that the gas insulation system (100) comprises:

a housing (102);

an insulator assembly (106), the insulator assembly (106) disposed within the housing (102) and comprising:

an insulator (114), the insulator (114) including a central portion (118) and a leg (120) extending outwardly from the central portion (118); and

a connecting member (116), the connecting member (116) having a cylindrical shape and being disposed to surround the insulator (114), the leg portion (120) being connected to the connecting member (116);

wherein the connecting member (116) comprises a radially outwardly projecting protrusion (122), the protrusion (122) being fixed to the housing (102) and abutting an inner surface of the housing (102) when fixed to the housing (102).

2. The gas insulation system (100) according to claim 1, wherein the leg (120) is embedded at its end with a metal insert (130), the metal insert (130) being connected to the connecting member (116).

3. The gas insulation system (100) of claim 1, wherein the protrusion (122) is fixed at an end of the housing (102).

4. The gas insulation system (100) of claim 3, wherein the housing (102) comprises a cylindrical section (110) and a flange section (112) connected to an end of the cylindrical section (110), the protrusion (122) being fixed to the flange section (112).

5. The gas insulation system (100) according to any one of claims 2 to 4, wherein the connection member (116) comprises a connection body (132) having a cylindrical shape, the protrusion (122) protrudes radially outward from the connection body (132) and comprises a first flat plate portion (136), an inner surface of the housing (102) comprises a planar portion (140);

wherein the first flat portion (136) abuts the flat portion (140) when the protrusion (122) is secured to the housing (102).

6. The gas insulation system (100) according to claim 5, characterized in that the peripheral wall of the connection body (132) comprises a second plate section (144), the leg (120) being connected at its ends with embedded metal inserts (130) to the second plate section (144).

7. The gas insulation system (100) of claim 6, wherein at least one of the first plate portion (136), the planar portion (140), and the second plate portion (144) is shaped by machining.

8. The gas insulation system (100) according to claim 5, characterized in that a peripheral wall of the connection body (132) is integrated with a particle trap (150).

9. The gas insulation system (100) according to any of claims 2 to 4, wherein the protrusion (122) comprises a first fastening hole (124) for fixing the protrusion (122) to the housing (102) by a first fastener (126), the connecting member (116) comprises a second fastening hole (134) for fixing a metal insert (130) embedded at an end thereof of the leg (120) to the connecting member (116) by a second fastener (135), the protrusion (122) being spaced from the second fastening hole (134) in an axial direction of the connecting member (116).

10. An insulator assembly (106) for a gas insulation system (100), the insulator assembly (106) comprising:

wherein the connection member (116) comprises a radially outwardly protruding protrusion (122), the protrusion (122) being adapted to be fixed to a housing (102) of the gas insulation system (100) and to abut an inner surface of the housing (102) when fixed to the housing (102).

11. Insulator assembly (106) for a gas insulation system (100) according to claim 10, wherein the leg (120) is embedded at its ends with a metal insert (130), the metal insert (130) being connected to the connecting member (116).