CN210606826U

CN210606826U - Porcelain bushing

Info

Publication number: CN210606826U
Application number: CN201922195143.3U
Authority: CN
Inventors: 谢利标; 郭振
Original assignee: Nanjing Switchgear Factory Co ltd
Current assignee: Nanjing Switchgear Co ltd
Priority date: 2019-12-09
Filing date: 2019-12-09
Publication date: 2020-05-22
Anticipated expiration: 2029-12-09

Abstract

The utility model relates to a power equipment technical field especially relates to a porcelain bushing. The porcelain sleeve is used for a gas switch, and comprises an inner insulation part, a flange part and an outer insulation part which are sequentially arranged along the axial direction, wherein the outer insulation part comprises an outer insulation cover and an outer insulation body, the outer insulation cover covers the periphery of the outer insulation body, and an annular U-shaped groove is formed between the outer insulation cover and the outer insulation body. Because form annular U type groove between outer insulating boot and the outer insulator, make the intraductal conductor of porcelain bushing to the conductor outside the porcelain bushing must pass through annular U type groove along the surperficial shortest path of insulator, thereby make this shortest path length increase, porcelain bushing's creepage distance has been increased promptly, porcelain bushing's antipollution ability and insulating ability have been improved, and the mode that forms annular U type groove between outer insulating boot and the outer insulator need not to set up the overlength with the outer insulator and can reach the creepage distance the same with the mode that sets up the full skirt, and the volume is less, make porcelain bushing easily install.

Description

Porcelain bushing

Technical Field

The utility model relates to a power equipment technical field especially relates to a porcelain bushing.

Background

At present, a sulfur hexafluoride gas switch is mostly adopted for outdoor power transmission of a power system to control a circuit.

The porcelain bushing is an important insulating part of the sulfur hexafluoride gas switch, and the insulating effect of the porcelain bushing is related to the safety of a circuit connected with the sulfur hexafluoride gas switch. The creepage distance is the shortest distance between two conductive parts along the surface of the solid insulating material, the larger the creepage distance is, the more difficult the phenomenon of electric leakage or ignition occurs between the two conductive parts, and the better the insulating property of the insulating device is, so the creepage distance is an important index for evaluating the performance of the porcelain bushing. When the porcelain bushing is applied to an outdoor sulfur hexafluoride gas switch, the creepage distance is often shortened due to pollution, the insulating capability of the porcelain bushing is further reduced, breakdown and flashover may occur, even interphase fault is caused, and safe power supply and reliable power supply are affected.

The current porcelain bushing for outdoor sulfur hexafluoride gas switch includes interior insulating part, outer insulation portion and flange portion, interior insulating part is connected to flange portion one end, outer insulation portion is connected to the other end, interior insulating part sets up inside sulfur hexafluoride gas switch, flange portion and outer insulation portion all set up outside sulfur hexafluoride gas switch, because outer insulation portion receives the pollution more easily, so set up a plurality of full skirts of arranging along the axis direction in the outer insulation portion, in order to increase creepage distance, do so and improved the antipollution ability of outer insulation portion, it is great in porcelain bushing axis direction space to set up the full skirt, it is great to cause the whole volume of outer insulation portion to be great, porcelain bushing's volume is great, lead to the difficult installation of porcelain bushing.

Therefore, a porcelain bushing with high anti-pollution capability and small volume is needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a porcelain bushing, this porcelain bushing intensity is high, resistance to corrosion is strong, small.

To achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a porcelain bushing for gas switch, porcelain bushing includes interior insulating part, flange portion and the outer insulating part that arranges in proper order along its axial, preferably, outer insulating part includes outer insulating boot and outer insulator, the outer insulating boot cover is established outer insulator's periphery, outer insulating boot with form annular U type groove between the outer insulator.

Preferably, the cross-sectional area of the space in the outer insulating cover gradually increases from the inner insulating part to the outer insulating body.

Preferably, the porcelain bushing further comprises a sheathing pipe matched with the annular U-shaped groove in shape, and the sheathing pipe is inserted into the annular U-shaped groove.

Preferably, a plurality of grooves are formed in the inner wall of the outer insulating cover, the outer wall of the outer insulating cover and/or the outer wall of the outer insulating body, and the plurality of grooves are arranged along the axial direction of the porcelain sleeve.

Preferably, the cross section of the groove is U-shaped or V-shaped.

Preferably, the whole ceramic sleeve is made of alumina ceramic.

Preferably, the inner insulating part includes:

and the umbrella skirts are arranged on the periphery of the inner insulating part and distributed along the axial direction of the porcelain sleeve uniformly.

Preferably, the porcelain bushing is provided with an electrode through hole along an axial direction thereof, and the electrode through hole penetrates through the inner insulating portion, the flange portion and the outer insulating body.

Preferably, the electrode through hole comprises a first electrode hole and a second electrode hole which are communicated, the first electrode hole is formed in the end face of the inner insulating part inwards, the second electrode hole is formed in the end face of the outer insulating part inwards, and the diameter of the second electrode hole is larger than that of the first electrode hole.

Preferably, a sealing groove is formed in the inner insulating portion, the sealing groove is formed between the inner insulating portion and the flange portion, and a sealing ring is arranged in the sealing groove.

The beneficial effects of the utility model reside in that:

the utility model discloses a porcelain bushing. Because form annular U type groove between outer insulating boot and the outer insulator, make the intraductal conductor of porcelain bushing to the conductor outside the porcelain bushing must pass through annular U type groove along the surperficial shortest path of insulator, thereby make this shortest path length increase, porcelain bushing's creepage distance has been increased promptly, porcelain bushing's antipollution ability and insulating ability have been improved, and the mode that forms annular U type groove between outer insulating boot and the outer insulator need not to set up the overlength with the outer insulator and can reach the creepage distance the same with the mode that sets up the full skirt, and the volume is less, make porcelain bushing easily install.

Drawings

Fig. 1 is a schematic structural diagram of a porcelain bushing provided by an embodiment of the present invention.

In the figure:

1-an inner insulation part; 11-umbrella skirt; 12-a seal groove; 2-a flange portion; 3-an outer insulation; 31-an outer insulator body; 32-an outer insulating cover; 33-annular U-shaped groove; 4-electrode through holes; 41-a first electrode hole; 42-second electrode hole.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

As shown in fig. 1, the embodiment of the present invention provides a porcelain bushing for a gas switch, wherein the porcelain bushing includes an inner insulating portion 1, a flange portion 2 and an outer insulating portion 3 arranged in sequence along a circumferential direction. The gas switch comprises an inner insulating part 1, a flange part 2 and an outer insulating part 3 which are integrally formed, wherein the flange part 2 and the outer insulating part 3 are arranged outside the gas switch, the surface of the flange part 2 close to the inner insulating part 1 is abutted to the shell of the gas switch, and the inner insulating part 1 is arranged inside the gas switch. Specifically, the outer insulating portion 3 includes an outer insulating cover 32 and an outer insulating body 31, the outer insulating cover 32 covers the outer periphery of the outer insulating body 31, and an annular U-shaped groove 33 is formed between the outer insulating cover 32 and the outer insulating body 31. Because form annular U type groove 33 between outer insulating boot 32 and outer insulator 31, make the intraductal conductor of porcelain bushing to the conductor outside the porcelain bushing must pass through annular U type groove 33 along the surperficial shortest path of insulator, thereby make this shortest path length increase, porcelain bushing's creepage distance has been increased promptly, porcelain bushing's antipollution ability and insulating ability have been improved, and form the mode of annular U type groove 33 between outer insulating boot 32 and outer insulator 31 and need not to set up outer insulator 31 overlength and can reach the creepage distance the same with the mode that sets up full skirt 11, and the volume is less, make porcelain bushing easily install.

Preferably, in order to further increase the insulating property of the porcelain bushing, the porcelain bushing further comprises a sheathing bushing. The protective sleeve is made of epoxy resin, the shape of the protective sleeve is matched with that of the annular U-shaped groove 33, and the protective sleeve can be inserted into the annular U-shaped groove 33. Because the protective sleeve is inserted in the annular U-shaped groove 33, the pollution of pollutants to the annular U-shaped groove 33 is prevented, and the insulating property of the porcelain sleeve is further improved.

Further, a plurality of grooves are formed in the inner wall of the outer insulation cover 32, the outer wall of the outer insulation cover 32 and the outer wall of the outer insulation body 31, the cross section of each groove is U-shaped, the grooves are arranged along the axial direction of the outer insulation portion 3, the creepage distance is further increased, and the insulation performance of the porcelain bushing is improved. In other embodiments, the groove may also be formed in one or two of the inner wall of the outer insulating cover 32, the outer wall of the outer insulating cover 32, and the outer wall of the outer insulating body 31, and the groove may also be in a V shape or other shapes, which can both increase the creepage distance of the porcelain bushing and improve the insulating performance of the porcelain bushing.

In order to enhance the insulating property of the outer insulating part 3, as shown in fig. 1, from the inner insulating part 1 to the outer insulating body 31, the cross-sectional area of the space in the outer insulating cover 32 is gradually increased, the opening width of the annular U-shaped groove 33 is increased, the phenomenon of breakdown or flashover caused by too small electrical gap due to too small opening width of the annular U-shaped groove 33 is avoided, meanwhile, the shortest distance from one end of the opening of the annular U-shaped groove 33 to the other end is increased, the creepage distance of the porcelain bushing is increased, and the insulating effect of the porcelain bushing is improved.

In order to enhance the insulating performance of the inner insulating part 1, the inner insulating part 1 includes a plurality of sheds 11, the sheds 11 are uniformly distributed on the periphery of the inner insulating part 1, and in the present embodiment, the number of sheds 11 is two. Set up in 1 periphery of interior insulation portion through 11 equipartitions of full skirt, increase creepage distance, the antipollution ability of reinforcing interior insulation portion 1 improves the insulating nature of interior insulation portion 1. In other embodiments, the number of the sheds 11 may be other, as long as the sheds 11 are ensured to be arranged on the outer periphery of the inner insulating portion 1.

In order to prolong the service life of the porcelain sleeve, the inner insulating part 1, the flange part 2 and the outer insulating part 3 are all made of alumina ceramics, and the alumina ceramics have the advantages of large hardness, good wear resistance, light weight, good high temperature resistance, good compressive strength, good bending strength, strong toughness and the like, so the porcelain sleeve made of the alumina ceramics is not easy to damage and has long service life.

As shown in fig. 1, the porcelain bushing is provided with an electrode through hole 4 along the axial direction thereof, the electrode through hole 4 penetrates through the inner insulating part 1, the flange part 2 and the outer insulating body 31, the electrode rod inside the gas switch can be inserted into the insulating electrode through hole 4 from one end of the inner insulating part 1 of the electrode through hole 4, the electrode rod is abutted against the electrode outside the gas switch at the outlet of the other end of the electrode through hole 4, and the electrode rod inside the gas switch is conveniently inserted into the porcelain bushing and conducted with the electrode outside the gas switch.

Preferably, the electrode through-hole 4 includes a first electrode hole 41 and a second electrode hole 42. Wherein, the end face of the inner insulating part 1 far away from the flange part 2 is inwards provided with a first electrode hole 41, the diameter of the first electrode hole 41 is the same as that of the electrode rod, the end face of the outer insulating body 31 far away from the flange part 2 is inwards provided with a second electrode hole 42, and the diameter of the second electrode hole 42 is larger than that of the first electrode hole 41. The internal electrode of the gas switch is abutted to the end face of the internal insulation part 1 far away from the flange part 2, the electrode rod is fixed on the internal electrode and conducted with the internal electrode, the electrode rod sequentially penetrates through the first electrode hole 41 and the second electrode hole 42, and the electrode rod is abutted to the external electrode of the gas switch at the outlet of the second electrode hole 42. The periphery is seted up threadedly on the electrode rod, and fixation nut cover is located the electrode rod periphery and is connected with second electrode hole 42 bottom surface looks butt, and fixation nut fixes the electrode rod in electrode through-hole 4, because the diameter of second electrode hole 42 is greater than first electrode hole 41, has made things convenient for revolving of fixation nut to revolve, and then has made things convenient for the installation of electrode rod in electrode through-hole 4.

Further, in order to prevent the fixing nut from being screwed to scratch the bottom surface of the second electrode hole 42, a washer is further sleeved on the electrode rod and arranged between the fixing nut and the bottom surface of the second electrode hole 42.

In addition, the inner insulating part 1 is provided with a sealing groove 12, the sealing groove 12 is arranged between the inner insulating part 1 and the flange part 2, and a sealing ring is arranged in the sealing groove 12. Through the sealing effect of the sealing ring, the air leakage of the gas switch caused by the installation of the porcelain sleeve is avoided.

The above description is only for the preferred embodiment of the present invention, and for those skilled in the art, there are variations on the detailed description and the application scope according to the idea of the present invention, and the content of the description should not be construed as a limitation to the present invention.

Claims

1. The utility model provides a porcelain bushing for gas switch, porcelain bushing include along its axial interior insulating part (1), flange portion (2) and the outer insulating part (3) that arrange in proper order, its characterized in that, outer insulating part (3) include outer insulating boot (32) and outer insulator (31), outer insulating boot (32) cover is established the periphery of outer insulator (31), outer insulating boot (32) with form annular U type groove (33) between outer insulator (31).

2. Porcelain bushing according to claim 1, characterized in that the cross-sectional area of the space inside the outer insulating cover (32) increases gradually from the inner insulation (1) to the outer insulating body (31).

3. A porcelain bushing according to claim 1, further comprising a sheathing tube having a shape matching the annular U-shaped groove (33), the sheathing tube being inserted in the annular U-shaped groove (33).

4. Porcelain bushing according to claim 1, wherein the inner wall of the outer insulating cover (32), the outer wall of the outer insulating cover (32) and/or the outer wall of the outer insulating body (31) is/are provided with a plurality of grooves, which are arranged in the axial direction of the porcelain bushing.

5. A porcelain bushing according to claim 4, wherein the cross section of the groove is U-shaped or V-shaped.

6. The porcelain bushing according to claim 1, wherein the porcelain bushing is integrally made of an alumina ceramic material.

7. Porcelain bushing according to claim 1, characterized in that the inner insulation (1) comprises:

a plurality of full skirt (11), set up the periphery of interior insulating part (1), it is a plurality of full skirt (11) are followed porcelain bushing's axial equipartition distributes.

8. Porcelain bushing according to claim 1, characterized in that it is provided with an electrode through hole (4) along its axial direction, said electrode through hole (4) passing through said inner insulating part (1), said flange part (2) and said outer insulating body (31).

9. The porcelain bushing according to claim 8, wherein the electrode through hole (4) comprises a first electrode hole (41) and a second electrode hole (42) which are communicated with each other, the first electrode hole (41) is opened inward at the end surface of the inner insulating portion (1), the second electrode hole (42) is opened inward at the end surface of the outer insulating portion (3), and the diameter of the second electrode hole (42) is larger than that of the first electrode hole (41).

10. The porcelain bushing according to claim 1, wherein the inner insulating portion (1) is provided with a sealing groove (12), the sealing groove (12) is disposed between the inner insulating portion (1) and the flange portion (2), and a sealing ring is disposed in the sealing groove (12).