CN217182697U

CN217182697U - Insulating sleeve and gas insulated switchgear with same

Info

Publication number: CN217182697U
Application number: CN202220193314.8U
Authority: CN
Inventors: 李玲; 张迪; 周争优
Original assignee: Cooper Ningbo Electric Co Ltd
Current assignee: Cooper Ningbo Electric Co Ltd
Priority date: 2022-01-24
Filing date: 2022-01-24
Publication date: 2022-08-12
Anticipated expiration: 2032-01-24

Abstract

The utility model relates to an insulation support and have its gas insulated switchgear. The insulation bushing is mounted to a gas box of a gas insulated switchgear and includes: an insulating body including a first extension portion axially extending into the air box from one side of the air box and a second extension portion radially outwardly protruding from the first extension portion and positioned to a surface of the air box; the compression ring is sleeved outside the first extension part and is positioned on one side, away from the air box, of the second extension part, and a connecting hole is formed in the area, extending outwards in the radial direction and exceeding the second extension part, of the compression ring; a fastener connected to the air box through the connection hole to compress the second extension between the compression ring and the air box.

Description

Insulating sleeve and gas insulated switchgear with same

Technical Field

The utility model relates to an electrical equipment technical field especially relates to insulation support and have its gas insulated switchgear.

Background

In recent years, gas insulated switchgear has been widely used in various applications such as power plants, substations, industrial and mining facilities, and residential areas, because of its advantages such as compact structure, high reliability, and convenience in installation, as an important device in power systems. The gas insulated switchgear generally seals electrical components such as a circuit breaker, a disconnecting ground switch, and a main bus in a gas box using an insulating gas such as sulfur hexafluoride, and leads out the main bus in the gas box through an insulating sleeve mounted to the gas box.

An insulating sleeve in the related art may include an insulating body such as an epoxy resin body and a conductive rod penetrating the insulating body, and an outer circumferential side of the insulating body may be embedded with a metal insert for connecting to the gas tank by means of a fastener such as a fastening screw to fix the insulating sleeve to the gas tank. However, if the metal insert is subjected to external force such as bending moment and tensile force, for example, through the gas box, the metal insert transmits the external force to the insulation body, and the insulation body, which is generally brittle, has a limited ability to withstand the external force such as bending moment and tensile force, so that there is a risk of cracking the insulation body or pulling the metal insert off.

Accordingly, there is a need in the art for a highly reliable insulating sleeve.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an insulation support that can solve above-mentioned part problem at least.

The utility model discloses still aim at providing an use above-mentioned modified insulation support's gas insulated switchgear.

According to an aspect of the utility model, a provide an insulation support, its gas tank of installing to gas insulated switchgear, insulation support includes: an insulating body including a first extension portion axially extending into the air box from one side of the air box and a second extension portion radially outwardly protruding from the first extension portion and positioned to a surface of the air box; the compression ring is sleeved outside the first extension part and is positioned on one side, away from the air box, of the second extension part, and a connecting hole is formed in the area, extending outwards in the radial direction and exceeding the second extension part, of the compression ring; a fastener connected to the air box through the connection hole to compress the second extension between the compression ring and the air box.

Compared with the prior art, the utility model provides an insulating sleeve is including arranging the insulator between clamping ring and gas tank to when being connected to the gas tank through the fastener with the clamping ring, can compress tightly insulator to the gas tank, such arrangement can allow the fastener when receiving external force such as no matter moment of flexure and/or pulling force, the external force of transmitting to insulator via the clamping ring only can make insulator receive pressure, insulator's atress situation is improved and its reliability can be improved.

Preferably, the insulation bushing further comprises: the conductive rod is axially arranged on the inner side of the first extension part in a penetrating manner; and the two ends of the shielding ring respectively extend out of the interface of the pressing ring and the second extension part and the interface of the second extension part and the air box along the axial direction.

Preferably, the first extension part has a first positioning part formed on an outer circumferential surface thereof opposite to the pressing ring, and the pressing ring has a second positioning part formed on an inner side thereof and connected to the first positioning part to prevent rotation relative to each other.

Preferably, the first positioning portion and the second positioning portion are configured as a positioning protrusion and a positioning groove that extend radially and are connected to each other in a form-fitting manner.

Preferably, a circumferentially extending sealing groove is formed in one side of the second extending portion facing the air box.

Preferably, the insulation sleeve further comprises a sealing ring mounted to the sealing groove.

Preferably, an induction element with one end connected to the shielding ring and the other end extending radially outward to the outer peripheral surface of the second extension portion is embedded in the second extension portion.

Preferably, the pressing ring is provided with a pressing plate located on a side of the second extension portion facing away from the air box and a side plate extending from the pressing plate toward the air box to surround the second extension portion, and the side plate is formed with an opening aligned with the inductive element.

Preferably, the pressure plate and the side plate are in smooth transition.

According to another aspect of the present invention, there is provided a gas insulated switchgear characterized in that the gas insulated switchgear comprises a gas tank and the aforementioned insulation sleeve mounted to the gas tank.

Additional features and advantages of the invention will be set forth in part in the description which follows, and in part will be apparent to those having ordinary skill in the art upon examination of the following, or may be learned from the practice of the invention.

Drawings

Embodiments of the present invention are described in detail below with reference to the attached drawing figures, wherein:

fig. 1 is a schematic view of an insulation body of an insulation bushing according to the invention;

fig. 2 is a schematic view of a pressure ring of an insulation sleeve according to the present invention;

fig. 3 is a schematic view of the installation of an insulation sleeve according to the invention;

fig. 4 is a sectional view of the installation of an insulation sleeve according to the invention.

Description of reference numerals:

10-an insulating sleeve; 11-an insulating body; 111-a first extension; 112-a second extension; 113-a first positioning portion; 114-a sealing groove; 115-a sensing element; 12-a pressure ring; 121-a pressing plate; 122-side plate; 123-opening; 124-through holes; 125-connecting hole; 126-a second location portion; 13-a fastener; 14-a conductive rod; 15-a shield ring; 20-air box.

Detailed Description

Referring now to the drawings, illustrative versions of the presently disclosed insulating sleeves will be described in detail. Although the drawings are provided to present some embodiments of the invention, the drawings are not necessarily to scale of particular embodiments, and certain features may be exaggerated, removed, or partially sectioned to better illustrate and explain the present disclosure. The position of some components in the drawings can be adjusted according to actual requirements on the premise of not influencing the technical effect. The appearances of the phrase "in the drawings" or similar language in the specification are not necessarily referring to all drawings or examples.

Certain directional terms used hereinafter to describe the drawings, such as "inner", "outer", "above", "below", and other directional terms, will be understood to have their normal meaning and refer to those directions as they normally relate to when viewing the drawings. Unless otherwise indicated, the directional terms described herein are generally in accordance with conventional directions as understood by those skilled in the art.

The terms "first," "second," and the like as used herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.

The terms "joined," "connected," and the like as used herein, include both two components that are indirectly connected together through an intermediate layer (e.g., an adhesive, a solder, etc.) or an intermediate member (e.g., a connector, a transition member, etc.), and two components that are directly connected together without any intermediate layer (e.g., an adhesive, a solder, etc.) or intermediate member (e.g., a connector, a transition member, etc.).

Fig. 1 to 4 show an insulation bushing 10 according to the present invention by way of example, the insulation bushing 10 can be mounted to a gas tank 20 of a gas insulated switchgear, and has high reliability during long-term use to avoid adverse effects on the gas insulated switchgear due to damage to the insulation bushing 10. The insulating sleeve 10 may include an insulating body 11, a pressing ring 12, and a fastening member 13.

As shown in fig. 1, the insulation body 11 may include a first extension 111 extending in an axial direction and a second extension 112 extending and protruding radially outward from the first extension 111. The first extension 111 may be cylindrical and may have a diameter that generally increases toward a section forming the second extension 112, and the second extension 112 may be annular and integrally formed with the first extension 111. The first and

second extensions

111 and 112 may be cast from an insulating material such as epoxy.

As shown in fig. 2, the pressing ring 12, which may be made of stainless steel, for example, may have a through hole 124 formed at the center thereof so as to be penetrated by the first extension 111 to be sleeved outside the first extension 111 and placed on the second extension 112. Alternatively, the shape of the through hole 124 on the pressing ring 12 is adapted to the outer circumferential surface of the first extension 111 in close proximity to the second extension 112, whereby the pressing ring 12 is arranged substantially coaxially with the first extension 111. The pressing ring 12 may be provided with a connection hole 125 extending beyond the second extension 112 in a radial direction, i.e., outward in the radial direction of the first extension 111 and in a region thereof extending beyond the second extension 112. The number of the connection holes 125 may be one or more, and when the number of the connection holes 125 is plural, for example, 4 as shown in the figure, the connection holes 125 may be uniformly distributed on the pressing ring 12.

As shown in fig. 3, the first extension portion 111 may extend from the outside of the air box 20 to the inside of the air box 20, and the second extension portion 112 may extend radially beyond an opening formed in the air box 20 for the first extension portion 111 to pass through, so that the second extension portion 112 is placed on the outer surface of the air box 20 when the first extension portion 111 extends into the air box 20. Subsequently, the press ring 12 may be placed from the end of the first extension 111 outside the air box 20 and placed on the side of the second extension 112 facing away from the air box 20. It can be seen that the connection hole 125 of the pressure ring 12 is directly opposed to the air box 20 without passing through the insulating body 11. Accordingly, a fastener 13, such as a screw or a nut, may be fixed to the air box 20 through the connection hole 125 to compress the second extension 112, and thus the insulation body 11, between the compression ring 12 and the air box 20. Preferably, to minimize the effect on the sealing of the gas tank 20, the fasteners 13 may be welded to the outer surface of the gas tank 20. Furthermore, it should be understood that the gas box 20 as shown only shows a partial box, and that the gas-insulated switchgear and its gas box 20 may be those known to the person skilled in the art, and therefore will not be described in detail here.

In this way, even when the fastening member 13 receives an external force via the gas box 20, the external force is then transmitted to the insulation body 11 via the pressing ring 12, but since the insulation body 11 is compressed between the pressing ring 12 and the gas box 20, the insulation body 11 only needs to bear pressure under the action of the external force, the stress of the insulation body 11 is improved to avoid damage, and the reliability is also improved. In addition, the insulating sleeve 10 and the assembling process between the insulating sleeve and the air box 20 are all performed outside the air box 20, so that only one person is needed for assembling, and the convenience is high.

As shown in connection with fig. 3, the insulating sleeve 10 may further include a conductive rod 14 and a shielding ring 15. The conductive rod 14 may be made of copper and may be axially coated by the first extension 111 without a gap. A shielding ring 15 may be coaxially embedded in the first extension 111 and surround the conducting rod 14 such that a first end of the shielding ring 15 extends axially beyond the interface of the pressure ring 12 and the second extension 112 and a second end thereof extends axially beyond the interface of the second extension 112 and the gas box 20. In this way, it is possible to avoid the partial discharge phenomenon caused by the air gap inevitably existing between the pressure ring 12 and the second extension portion 112 and between the second extension portion 112 and the air box 20 in long-term use, and to improve the operational reliability of the insulating sleeve 10 and the gas insulated switchgear to which it is applied. Furthermore, the conductive rod 14 and the shielding ring 15 may be integrally cast with the insulating body 11.

As shown in fig. 1 and 2, the outer circumferential surface of the first extension 111 opposite to the through hole 124 of the pressing ring 12 may be formed with a first positioning portion 113, the inside of the through hole 124 of the pressing ring 12 may be correspondingly formed with a second positioning portion 126, and the first positioning portion 113 and the second positioning portion 126 may be connected to each other when the pressing ring 12 is sleeved to the first extension 111 to prevent rotation relative to each other, thereby preventing the pressing ring 12 and the insulating body 11 from rotating relative to each other and improving connection stability. Further, the first positioning part 113 may be configured as a positioning protrusion extending radially outward from the first extension 111 and not beyond the second extension 112 as shown in the drawings, and the second positioning part may be configured as a positioning groove extending radially outward from the through hole 124 of the pressure ring 12 and being in shape-fitting connection with the positioning protrusion, or vice versa. Alternatively, the number of the first positioning portions 113 and the second positioning portions 126 may be configured to be plural as 3 as shown in the figure, and evenly distributed along the circumferential direction of the first extension portion 111 and the through hole 124 of the pressure ring 12, respectively.

As shown in fig. 4, a side of the second extension 112 facing the air tank 20 may be provided with a sealing groove 114 extending in a circumferential direction, so that when the insulation body 11 is compressed between the compression ring 12 and the air tank 20 by the fastening member 13, a sealing ring mounted to the sealing groove 114 may be compressed between the insulation body 11 and the air tank 20, thereby ensuring sealability of the air tank 20.

As shown in fig. 3, a radially extending sensing element 115 may be embedded in the second extension portion 112, one end of the sensing element 115 may be connected to the shield ring 15, and the other end may extend to the outer circumferential surface of the second extension portion 112. Thus, after the insulating sleeve 10 is mounted to the air box 20, the lead-out wire of the inductive element 115 is led out from the side direction. Compared with the induction element 115 with the outgoing line led upwards, the induction element 115 in the embodiment can avoid being equipotential with a metal shell at the ground potential due to deposition of condensation, dirt and the like in the long-term use process, so that the loss of the weak voltage induced by the induction element 115 is avoided, and the accurate display of the electrified indicating device connected with the induction element 115 is ensured.

Alternatively, the pressure ring 12 may include a pressure plate 121 and a side plate 122, the pressure plate 121 may be located on the upper surface of the second extension portion 112, the side plate 122 may extend vertically downward from the pressure plate 121 to surround the second extension portion 112 and an area thereof opposite to the inductive element 115 is provided with an opening 123 aligned with the inductive section to facilitate lead-out of the lead-out wire of the inductive element 115. The pressure plate 121 and the side plate 122 may be rounded to avoid forming a sharp corner, and the radius of the rounded transition may be as small as possible to make the pressure plate 121 close to the outer circumferential surface of the second extension 112 as possible, so that the overall size of the insulation sleeve 10 is reduced and the structure is compact.

It should be understood that although the description is in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.

The above description is only illustrative of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes, modifications and combinations that may be made by those skilled in the art without departing from the spirit and principles of the invention should be considered within the scope of the invention.

Claims

1. An insulating bushing mounted to a gas box (20) of a gas-insulated switchgear, characterized in that the insulating bushing (10) comprises:

an insulating body (11) comprising a first extension (111) axially extending into the air box (20) from one side of the air box (20) and a second extension (112) radially outwardly protruding from the first extension (111) and positioned to a surface of the air box (20);

the pressing ring (12) is sleeved on the outer side of the first extension part (111) and located on one side, away from the air box (20), of the second extension part (112), and a connecting hole (125) is formed in the area, extending outwards in the radial direction, of the pressing ring (12) and exceeding the second extension part (112);

a fastener (13) connected to the air tank (20) through the connection hole (125) to compress the second extension (112) between the compression ring (12) and the air tank (20).

2. The bushing of claim 1, wherein the bushing (10) further comprises:

a conductive rod (14) axially inserted inside the first extension (111);

and the shielding ring (15) is coaxially embedded in the first extension part (111) and surrounds the conductive rod (14), and two ends of the shielding ring (15) respectively extend beyond the interface of the pressing ring (12) and the second extension part (112) and the interface of the second extension part (112) and the air box (20) along the axial direction.

3. The bushing of claim 1, wherein the first extension (111) has a first positioning portion (113) formed on an outer circumferential surface thereof opposite to the pressing ring (12), and a second positioning portion (126) connected to the first positioning portion (113) to prevent rotation relative to each other is formed on an inner side of the pressing ring (12).

4. An insulation bushing according to claim 3, characterized in that the first detent (113) and the second detent (126) are configured as a detent projection and a detent groove extending radially and being in form-fitting connection with each other.

5. The bushing of claim 1, wherein a side of the second extension (112) facing the air box (20) is provided with a circumferentially extending sealing groove (114).

6. The bushing of claim 5, wherein the bushing (10) further comprises a seal ring mounted to the seal groove (114).

7. An insulation bushing according to claim 2, characterized in that the second extension (112) is embedded with an inductive element (115) having one end connected to the shield ring (15) and the other end extending radially outward to the outer circumferential surface of the second extension (112).

8. An insulation bushing according to claim 7, characterized in that the pressure ring (12) is provided with a pressure plate (121) at a side of the second extension (112) facing away from the air box (20) and a side plate (122) extending from the pressure plate (121) towards the air box (20) to enclose the second extension (112), and that the side plate (122) is formed with an opening (123) aligned with the inductive element (115).

9. Bushing according to claim 8, characterized in that the pressure plate (121) and the side plate (122) are rounded off.

10. A gas-insulated switchgear arrangement, characterized in that it comprises a gas tank (20) and an insulating bushing (10) according to any of claims 1-9 mounted to the gas tank (20).