Miniaturized environment-friendly gas insulated three-position isolating switch

Abstract

The utility model provides a miniaturized environment-friendly gas insulated three-position isolating switch, which comprises a box cylinder type shell, an operating mechanism, a transmission assembly, a grounding static contact seat, a first isolating static contact seat, a second isolating static contact seat and a conductive piece, the conductive end of the grounding static contact seat, the conductive end of the first isolation static contact seat and the conductive end of the second isolation static contact seat all extend into the box cylinder type shell and are coaxially arranged with the box cylinder type shell, the conductive piece can be embedded in the conductive end of the first isolation static contact seat in an axial moving manner, and the operating mechanism is fixed on the outer wall of the box cylinder type shell. The transmission assembly is rotatably and circumferentially connected to one end of the box cylinder type shell in a sealing manner, the outer end part of the transmission assembly is in transmission connection with the driving end of the operating mechanism, and the conductive piece is in transmission connection with the inner end part of the transmission assembly; the interior of the box cylinder type shell is filled with environment-friendly gas; the utility model has the advantages of small volume and low production and material cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of disconnectors, in particular to a small environmental protection gas insulation three-position disconnector. BACKGROUND

[0002] In recent years, with the continuous development of power transmission and distribution system, disconnectors have been widely used. Three-position disconnectors integrate the grounding position on the traditional two-position disconnector and are widely used in power supply systems. Three-position disconnectors have three working positions, namely, the conducting position, the grounding position and the intermediate isolation position. Most 24-35kV three-position disconnectors on the market adopt normal-pressure air insulation structure, which makes the isolation breaking point and the ground insulation distance very large, and the three-position disconnector is very large in size, resulting in a large switch cabinet and high material cost. SUMMARY

[0003] The utility model solves the technical problem to provide a small environmental protection gas insulation three-position disconnector, which has the advantages of small size, low production and material cost.

[0004] The utility model provides a small environmental protection gas insulation three-position disconnector, which comprises a box cylinder type shell, an operating mechanism, a transmission assembly, a grounding static contact seat, a first isolation static contact seat, a second isolation static contact seat and a conductive part. The grounding static contact seat, the first isolation static contact seat and the second isolation static contact seat are fixed on the side wall of the box cylinder type shell in sequence along the axial direction of the box cylinder type shell and are circumferentially sealed with the box cylinder type shell. The conductive end of the grounding static contact seat, the conductive end of the first isolation static contact seat and the conductive end of the second isolation static contact seat all extend into the interior of the box cylinder type shell and are coaxially arranged with the box cylinder type shell. The conductive part is axially movably embedded in the conductive end of the first isolation static contact seat. The operating mechanism is fixed on the outer wall of the box cylinder type shell. The transmission assembly is rotatably and circumferentially sealed connected to one end of the box cylinder type shell. The outer end of the transmission assembly is in transmission connection with the driving end of the operating mechanism. The conductive part is in transmission connection with the inner end of the transmission assembly. The operating mechanism is used to drive the conductive part to move along the axial direction of the box cylinder type shell to make the three-position disconnector work in the grounding, isolation or conducting mode. The interior of the box cylinder type shell is filled with environmental protection gas.

[0005] The utility model closes the conductive end of the grounding static contact seat, the conductive end of the first isolation static contact seat and the conductive end of the second isolation static contact seat in the box cylinder type shell and fills the box cylinder type shell with environmental protection gas, thereby reducing the insulation distance between the first isolation static contact seat and the grounding static contact seat and the insulation distance between the first isolation static contact seat and the second isolation static contact seat, and making the three-position disconnector smaller in size and lower in production and material cost.

[0006] In a possible implementation, the three-position disconnecting switch further comprises a lead screw, one end of the lead screw is in transmission connection with the inner end of the transmission assembly, the conductive part is in a ring shape structure, one end of the conductive part is embedded with an insulating connecting sleeve, the other end of the lead screw is arranged in the insulating connecting sleeve and is in threaded connection with the insulating connecting sleeve; when the motor in the operating mechanism drives the lead screw to rotate through the transmission assembly, the lead screw drives the conductive part to move along the axial direction of the box cylinder type shell through the insulating connecting sleeve to make the three-position disconnecting switch work in the grounding, isolation or conduction mode; after the structure is adopted, when the motor in the operating mechanism drives the lead screw to rotate through the transmission assembly, the lead screw can drive the conductive part to move along the axial direction of the box cylinder type shell through the insulating connecting sleeve; when the conductive part moves to one side of the grounding static contact seat to make the conductive end of the first isolation static contact seat and the conductive end of the grounding static contact seat conduct through the conductive part, the three-position disconnecting switch can work in the grounding mode; when the conductive part moves to the intermediate position and is separated from the conductive end of the grounding static contact seat and the conductive end of the second isolation static contact seat, the three-position disconnecting switch can work in the isolation mode; when the conductive part moves to one side of the second isolation static contact seat to make the conductive end of the first isolation static contact seat and the conductive end of the second isolation static contact seat conduct through the conductive part, the three-position disconnecting switch can work in the conduction mode; the movement position of the conductive part is controlled through the operating mechanism, so that the working state of the three-position disconnecting switch is controlled, and the structure has the advantages of convenient control; in addition, the insulation between the conductive part and the lead screw is realized by the insulating connecting sleeve.

[0007] In a possible implementation, an outer wall of the conductive part is axially provided with a limiting groove, a side wall of the conductive end of the first isolation static contact seat is fixed with at least one limiting pin, an inner end of the limiting pin is inserted into the limiting groove and can slide along the length direction of the limiting groove when the conductive part moves; after the structure is adopted, the cooperation of the limiting pin and the limiting groove can realize the circumferential limiting of the conductive part and the conductive end of the first isolation static contact seat, so that when the lead screw rotates, the conductive part can be prevented from rotating with the lead screw, and the reliability of the movement of the conductive part relative to the conductive end of the first isolation static contact seat is ensured.

[0008] In a possible implementation, the side wall of the conductive end of the first isolation static contact seat is fixed with two limiting pins, the two limiting pins are spaced apart along the axial direction of the conductive end of the first isolation static contact seat, and the inner ends of the two limiting pins are inserted into the limiting groove and can slide along the length direction of the limiting groove when the conductive part moves; after the structure is adopted, the two limiting pins can further realize the circumferential limiting of the conductive part and the conductive end of the first isolation static contact seat, and the two limiting pins can further guide the movement of the conductive part relative to the conductive end of the first isolation static contact seat, so as to improve the reliability of the movement of the conductive part relative to the conductive end of the first isolation static contact seat.

[0009] In a possible implementation, the transmission assembly comprises a transmission shaft and a rotary seal; the rotary seal is fixed on one end of the box-cylinder shell and circumferentially sealed with the box-cylinder shell; the transmission shaft is rotatably arranged in the rotary seal and circumferentially sealed with the rotary seal; an outer end of the transmission shaft is in transmission connection with the driving end of the operating mechanism; and an inner end of the transmission shaft is axially fixed and in transmission connection with one end of the lead screw; through the above structure, the transmission shaft can be reliably rotatably connected on one end of the box-cylinder shell and circumferentially sealed with the box-cylinder shell under the action of the rotary seal, and the lead screw can be reliably in transmission connection with the driving end of the operating mechanism through the transmission shaft; in addition, the outer end of the transmission shaft can be in transmission connection with the driving end of the operating mechanism through a chain assembly or other transmission component.

[0010] In a possible implementation, the environment-friendly gas is compressed air or nitrogen, and the gas pressure value of the environment-friendly gas filled in the box-cylinder shell is not less than 0.5 Mpa; by using compressed air or nitrogen as the environment-friendly gas, the environment-friendly advantage is achieved, and because the gas pressure value of the environment-friendly gas filled in the box-cylinder shell is not less than 0.5 Mpa, the insulation distance between the first isolated static contact seat and the grounding static contact seat can be reduced, and the insulation distance between the first isolated static contact seat and the second isolated static contact seat can be reduced, so that the three-position disconnecting switch is smaller in size and lower in production and material cost. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a structural schematic view of the utility model. DETAILED DESCRIPTION

[0012] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can adjust them as needed to adapt to specific application occasions.

[0013] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0014] In the embodiments of the present application, unless specifically defined and limited otherwise, a first feature is "on", "under", "above", or "over" a second feature can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over", and "on" the second feature can mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. The first feature "below", "under", and "on" the second feature can mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0015] The present application will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0016] Referring to Figure 1 As shown in the drawings, the embodiments of the present application disclose a miniaturized environmentally friendly gas-insulated three-position disconnecting switch, comprising a box-cylinder type shell 1, an operating mechanism 2, a transmission assembly 3, a grounding static contact seat 4, a first isolation static contact seat 5, a second isolation static contact seat 6, and a conductive part 7. The grounding static contact seat 4, the first isolation static contact seat 5, and the second isolation static contact seat 6 are sequentially and spacedly fixed on the side wall of the box-cylinder type shell 1 along the axial direction of the box-cylinder type shell 1 and are circumferentially sealed with the box-cylinder type shell 1. The conductive end of the grounding static contact seat 4, the conductive end of the first isolation static contact seat 5, and the conductive end of the second isolation static contact seat 6 all extend into the interior of the box-cylinder type shell 1 and are coaxially arranged with the box-cylinder type shell 1. The conductive part 7 is axially movably embedded in the conductive end of the first isolation static contact seat 5. The operating mechanism 2 is fixed on the outer wall of the box-cylinder type shell 1. The transmission assembly 3 is rotatably and circumferentially sealedly connected to one end of the box-cylinder type shell 1. The outer end of the transmission assembly 3 is in transmission connection with the driving end of the operating mechanism 2. The conductive part 7 is in transmission connection with the inner end of the transmission assembly 3. The operating mechanism 2 is used to drive the conductive part 7 to move along the axial direction of the box-cylinder type shell 1 so as to make the three-position disconnecting switch work in the grounding, isolation, or conduction mode. The interior of the box-cylinder type shell 1 is filled with environmentally friendly gas.

[0017] The three-position isolating switch further comprises a lead screw 8, one end of the lead screw 8 is in transmission connection with the inner end of the transmission assembly 3, the conductive part 7 is in ring shape structure, one end of the conductive part 7 is embedded with an insulating connecting sleeve 9, the other end of the lead screw 8 is arranged in the insulating connecting sleeve 9 and is in threaded connection with the insulating connecting sleeve 9; when the motor in the operating mechanism 2 drives the lead screw 8 to rotate through the transmission assembly 3, the lead screw 8 drives the conductive part 7 to move along the axial direction of the box cylinder type shell 1 through the insulating connecting sleeve 9 to make the three-position isolating switch work in the grounding, isolating or conducting mode; after the structure is adopted, when the motor in the operating mechanism drives the lead screw to rotate through the transmission assembly, the lead screw can drive the conductive part to move along the axial direction of the box cylinder type shell through the insulating connecting sleeve; when the conductive part moves to one side of the grounding static contact seat to make the conductive end of the first isolating static contact seat and the conductive end of the grounding static contact seat conduct through the conductive part, the three-position isolating switch can work in the grounding mode; when the conductive part moves to the intermediate position and is separated from the conductive end of the grounding static contact seat and the conductive end of the second isolating static contact seat, the three-position isolating switch can work in the isolating mode; when the conductive part moves to one side of the second isolating static contact seat to make the conductive end of the first isolating static contact seat and the conductive end of the second isolating static contact seat conduct through the conductive part, the three-position isolating switch can work in the conducting mode; the moving position of the conductive part is controlled through the operating mechanism to control the working state of the three-position isolating switch, which has the advantages of convenient control; in addition, the insulation between the conductive part and the lead screw is realized by the insulating connecting sleeve.

[0018] The outer wall of the conductive part 7 is axially provided with a limiting slot 71, the side wall of the conductive end of the first isolating static contact seat 5 is fixed with at least one limiting pin 10, the inner end of the limiting pin 10 is inserted into the limiting slot 71 and can slide along the length direction of the limiting slot 71 when the conductive part 7 moves; after the structure is adopted, the circumferential limiting of the conductive part and the conductive end of the first isolating static contact seat is realized under the cooperation of the limiting pin and the limiting slot, so that the conductive part can be prevented from rotating with the lead screw when the lead screw rotates, and the reliability of the movement of the conductive part relative to the conductive end of the first isolating static contact seat is ensured.

[0019] The side wall of the conductive end of the first isolating static contact seat 5 is fixed with two limiting pins 10, the two limiting pins 10 are spaced apart along the axial direction of the conductive end of the first isolating static contact seat 5, the inner ends of the two limiting pins 10 are inserted into the limiting slot 71 and can slide along the length direction of the limiting slot 71 when the conductive part 7 moves; after the structure is adopted, the circumferential limiting of the conductive part and the conductive end of the first isolating static contact seat is further realized under the action of the two limiting pins, and the two limiting pins can further guide the movement of the conductive part relative to the conductive end of the first isolating static contact seat to improve the reliability of the movement of the conductive part relative to the conductive end of the first isolating static contact seat.

[0020] The transmission assembly 3 comprises a transmission shaft 31 and a rotary seal 32; the rotary seal 32 is fixed on one end of the box cylinder shell 1 and is circumferentially sealed with the box cylinder shell 1, the transmission shaft 31 is rotatably arranged in the rotary seal 32 and is circumferentially sealed with the rotary seal 32, the outer end of the transmission shaft 31 is in driving connection with the driving end of the operating mechanism 2, and one end of the lead screw 8 is axially fixed and in driving connection with the inner end of the transmission shaft 31; after the above structure is adopted, under the action of the rotary seal, the transmission shaft can be reliably rotatably connected on one end of the box cylinder shell and circumferentially sealed with the box cylinder shell, and the lead screw can be reliably drivingly connected with the driving end of the operating mechanism through the transmission shaft; in addition, the outer end of the transmission shaft can be drivingly connected with the driving end of the operating mechanism through a chain assembly or other transmission member.

[0021] The environment-friendly gas is compressed air or nitrogen, and the gas pressure value of the environment-friendly gas filled in the box cylinder shell 1 is not less than 0.5 Mpa; by using compressed air or nitrogen as the environment-friendly gas, the environment-friendly advantage is obtained, and since the gas pressure value of the environment-friendly gas filled in the box cylinder shell is not less than 0.5 Mpa, the insulation distance between the first isolated static contact seat and the grounding static contact seat can be reduced, and the insulation distance between the first isolated static contact seat and the second isolated static contact seat can be reduced, thereby the volume of the three-position disconnector can be smaller, and the production and material costs can be lower.

[0022] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A miniaturized environmentally friendly gas-insulated three-position disconnector, characterized in that: The three-position disconnecting switch comprises a box-cylinder shell (1), an operating mechanism (2), a transmission assembly (3), a grounding static contact seat (4), a first isolation static contact seat (5), a second isolation static contact seat (6) and a conductive part (7). The grounding static contact seat (4), the first isolation static contact seat (5) and the second isolation static contact seat (6) are fixed on the side wall of the box-cylinder shell (1) in sequence along the axial direction of the box-cylinder shell (1) and are circumferentially sealed with the box-cylinder shell (1). The conductive end of the grounding static contact seat (4), the conductive end of the first isolation static contact seat (5) and the conductive end of the second isolation static contact seat (6) all extend into the inside of the box-cylinder shell (1) and are coaxially arranged with the box-cylinder shell (1). The conductive part (7) is axially movably embedded in the conductive end of the first isolation static contact seat (5). The operating mechanism (2) is fixed on the outer wall of the box-cylinder shell (1). The transmission assembly (3) is rotatably and circumferentially sealed connected to one end of the box-cylinder shell (1). The outer end of the transmission assembly (3) is in transmission connection with the driving end of the operating mechanism (2). The conductive part (7) is in transmission connection with the inner end of the transmission assembly (3). The operating mechanism (2) is used to drive the conductive part (7) to move along the axial direction of the box-cylinder shell (1) so that the three-position disconnecting switch works in the grounding, isolation or conduction mode. The inside of the box-cylinder shell (1) is filled with environment-friendly gas.

2. The miniaturized environmentally friendly gas-insulated three-position disconnector according to claim 1, characterized in that The three-position disconnecting switch further comprises a lead screw (8). One end of the lead screw (8) is in transmission connection with the inner end of the transmission assembly (3). The conductive part (7) is in the shape of a ring. An insulating connecting sleeve (9) is embedded in one end of the conductive part (7). The other end of the lead screw (8) is arranged in the insulating connecting sleeve (9) and is in threaded connection with the insulating connecting sleeve (9). When the motor in the operating mechanism (2) drives the lead screw (8) to rotate through the transmission assembly (3), the lead screw (8) drives the conductive part (7) to move along the axial direction of the box-cylinder shell (1) through the insulating connecting sleeve (9) so that the three-position disconnecting switch works in the grounding, isolation or conduction mode.

3. The miniaturized environmentally friendly gas-insulated three-position disconnector according to claim 2, characterized in that A limiting groove (71) is axially arranged on the outer wall of the conductive part (7). At least one limiting pin (10) is fixed on the side wall of the conductive end of the first isolation static contact seat (5). The inner end of the limiting pin (10) is inserted into the limiting groove (71) and can slide along the length direction of the limiting groove (71) when the conductive part (7) moves.

4. The miniaturized environmentally friendly gas-insulated three-position disconnector according to claim 3, characterized in that Two limiting pins (10) are fixed on the side wall of the conductive end of the first isolation static contact seat (5). The two limiting pins (10) are distributed in the axial direction of the conductive end of the first isolation static contact seat (5) in sequence. The inner ends of the two limiting pins (10) are both inserted into the limiting groove (71) and can slide along the length direction of the limiting groove (71) when the conductive part (7) moves.

5. The compact environmentally friendly gis three-position disconnector according to claim 2, characterized in that: The transmission assembly (3) comprises a transmission shaft (31) and a rotary seal (32); the rotary seal (32) is fixed on one end of the box-cylinder shell (1) and circumferentially sealed with the box-cylinder shell (1), the transmission shaft (31) is rotatably arranged in the rotary seal (32) and circumferentially sealed with the rotary seal (32), the outer end of the transmission shaft (31) is in transmission connection with the driving end of the operating mechanism (2), and one end of the screw rod (8) is axially fixed and in transmission connection with the inner end of the transmission shaft (31).

6. The compact environmentally friendly gis three-position disconnector according to any one of claims 1-5, characterized in that: The environment-friendly gas is compressed air or nitrogen, and the gas pressure value of the environment-friendly gas filled in the box-cylinder shell (1) is not less than 0.5 Mpa.

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