CN212934477U

CN212934477U - Ring main unit vacuum circuit breaker with adjustable contact pressure

Info

Publication number: CN212934477U
Application number: CN202021551753.9U
Authority: CN
Inventors: 顾晓冬; 王安心; 徐文; 张强华
Original assignee: Murge Electric Co ltd
Current assignee: Murge Electric Co ltd
Priority date: 2020-07-30
Filing date: 2020-07-30
Publication date: 2021-04-09
Anticipated expiration: 2030-07-30

Abstract

A contact pressure adjustable ring main unit vacuum circuit breaker comprises a movable device, a pressure adjusting device and an insulating plate; the movable device is arranged on the insulating plate; the pressure adjusting device is arranged on the movable device and connected with the insulating plate; the pressure adjusting device comprises an arc extinguish chamber, a pressure rod, a static contact seat and a bracket; a threaded hole is formed in the static end of the arc extinguish chamber; a screw is arranged to penetrate through the pressure rod and the static contact seat and is in threaded connection with a threaded hole at the static end of the arc extinguish chamber; the pressure lever is provided with external threads and is connected with the bracket through a nut; the two insulation plates are symmetrically arranged on two sides of the movable device and the pressure adjusting device; through the plane direct contact with stationary contact seat and explosion chamber bottom, realize that the electric current switches on, avoid traditional problem through the local temperature rise of the electrically conductive production of guide arm and connection structure, depression bar and nut adopt steel material simultaneously, and mechanical strength is stronger, and the cost is lower.

Description

Ring main unit vacuum circuit breaker with adjustable contact pressure

Technical Field

The utility model relates to a circuit breaker field especially relates to a contact pressure adjustable looped netowrk cabinet vacuum circuit breaker.

Background

The ring main unit is a device for switching on/off load current, open-end short-circuit current and transformer no-load current, mainly plays a role in controlling and protecting a power supply line, and is important switch equipment for ring network power supply and terminal power supply. The ring main unit has the advantages of simple structure, small volume, low price, capability of improving power supply parameters and performance, power supply safety and the like, and is widely applied to residential districts, high-rise buildings, work distribution stations and box-type substations.

The ring main unit can be divided into an air insulation ring main unit, an SF6 insulation ring main unit, a solid insulation ring main unit and an environment-friendly gas insulation ring main unit according to different insulation media; the three types of the load switch cabinet, the combined electrical appliance cabinet and the breaker cabinet can be classified according to different functions and structural forms; wherein the insulating medium and the functional structure of looped netowrk cabinet can make up.

The existing circuit breaker cabinet can be applied to a vacuum arc extinguish chamber when gas is used as an insulating medium, wherein the three-phase vacuum arc extinguish chamber is arranged in front of, behind and corresponding to three-phase voltage. The movable end of the vacuum arc extinguish chamber is provided with a vacuum switch pull rod, a pressure maintaining cap sleeve and a transmission part of the circuit breaker body to realize connection. The movable end of the vacuum arc extinguish chamber is flexibly connected with the circuit breaker through a copper bar, so that the movable end of the vacuum arc extinguish chamber is connected with a main bus of a primary loop. The fixed screw thread guide arm that sets up of vacuum interrupter's quiet end, screw thread guide arm and stationary contact seat pass through threaded connection, realize the connection of primary circuit inlet wire end, and specific threaded connection form is the through-hole that the screw thread guide arm passed on the stationary contact seat, sets up the nut on the upper and lower surface of stationary contact seat, realizes the fixed connection of screw thread guide arm and stationary contact seat. The external thread guide rod and the nut which are arranged at the static end of the existing arc extinguish chamber are made of copper materials, the mechanical strength is not high, and after repeated operation, copper threads are extremely easy to damage, so that the thread pitch is reduced, the threads are seized, and the characteristic parameters of a vacuum arc extinguisher and the service life of a circuit breaker are influenced.

In addition, the current reaches the static contact seat through the guide rod and the nut of the circuit breaker, so that the solid contact is unreliable, the contact area is small, the through-current capacity is weak, the local temperature is increased, and the parameter characteristics of the vacuum arc extinguish chamber and the service life of the circuit breaker are influenced.

Disclosure of Invention

The utility model aims at solving the not enough of prior art, provide a contact pressure adjustable looped netowrk cabinet vacuum circuit breaker, simple structure, it is convenient that contact pressure adjusts, and the through-flow capacity is strong, and mechanical life number of times is long, and mechanical properties is reliable and stable, and is with low costs.

A contact pressure adjustable ring main unit vacuum circuit breaker comprises a movable device, a pressure adjusting device and an insulating plate; the movable device is arranged on the insulating plate; the pressure adjusting device is arranged on the movable device and is also connected with the insulating plate; the pressure adjusting device comprises an arc extinguish chamber, a pressure rod, a static contact seat and a bracket; a threaded hole is formed in the static end of the arc extinguish chamber; a screw is arranged to penetrate through the pressure rod and the static contact seat and is in threaded connection with a threaded hole at the static end of the arc extinguish chamber; the pressure lever is provided with external threads and is connected with the bracket through a nut; the two insulation plates are symmetrically arranged on two sides of the movable device and the pressure adjusting device; the transmission devices are three groups, and three groups of pressure adjusting devices are correspondingly arranged.

Furthermore, the end surface of the static end of the arc extinguish chamber is a plane; the static end of the arc extinguish chamber is attached to the static contact seat.

Furthermore, one end of the pressure lever is provided with a hexagonal prism structure; the pressure lever is internally provided with a through hole for passing through a screw.

Furthermore, a fixing nut is welded on one surface of the support and is connected with the external thread of the pressure rod; the other side of the bracket is provided with a fastening nut, and the bracket is connected with the pressure rod by screwing the fastening nut; the nut, the screw and the pressure lever are all made of steel materials.

Furthermore, the static contact seat adopts a fillet copper busbar, and the vertical section of the static contact seat is L-shaped; one surface of the static contact seat is provided with a through hole, and the through hole is used for penetrating through a screw; the other surface of the stationary contact seat is provided with a waist-shaped hole which is connected with the bracket through the waist-shaped hole.

Further, the side edge of the bracket extends to the direction vertical to the plane of the bracket; the extension part on the side surface of the bracket is attached to the insulating plate; the extending part of the side surface of the bracket is also connected with a waist-shaped hole arranged on the static contact seat.

Furthermore, the pressure regulating device also comprises a vacuum pull rod, a pressure maintaining spring and a copper flexible connection, wherein the vacuum pull rod is arranged at the movable end of the arc extinguish chamber; the pressure maintaining spring is arranged between the movable device and the arc extinguish chamber and sleeved on the outer side of the vacuum pull rod; a copper flexible connection is arranged between the pressure maintaining spring and the arc extinguish chamber; the copper flexible connection sleeve is connected to the moving end of the arc extinguish chamber, the copper flexible connection sleeve is fixedly connected with the arc extinguish chamber, and the two ends of the copper flexible connection sleeve penetrate through the insulating plate to be connected with the primary loop.

Further, the movable device comprises a transmission main shaft, a bearing and a transmission device; the bearing and the transmission device are arranged on the transmission main shaft; the bearing is arranged at one end of the transmission main shaft; two sides of the bearing are provided with dynamic sealing structures; the outer ring of the bearing is fixedly connected with the insulating plate.

Further, the transmission device comprises a cam and a pulley; the cam is fixedly connected with the transmission main shaft, an arc-shaped hollow is arranged on the cam, one end of the arc-shaped hollow is close to the transmission main shaft, and the other end of the arc-shaped hollow is far away from the transmission main shaft; a pulley is arranged in the arc-shaped hollow of the cam and can move along the arc-shaped hollow; support plates are arranged on two sides of the cam, and two ends of each support plate are fixedly connected with the insulation plates on the two sides; the support plate is sleeved on the transmission main shaft and can rotate around the transmission main shaft; the support plate is provided with a vertical hollow part; the vacuum pull rod in the pressure device is connected with the pulley through a short pin; the two ends of the short pin extend outwards and are arranged in the vertical hollows of the support plate

Furthermore, the diameter of the through hole in the pressure lever close to one end of the hexagonal prism structure is enlarged, so that a screw can be embedded in the through hole; the periphery of the arc extinguish chamber is also provided with a fixed plate; two sides of the fixed plate are respectively abutted against the two insulating plates.

The utility model has the advantages that:

the static contact seat is in direct contact with the plane at the bottom of the arc extinguish chamber, so that current conduction is realized, the problem of local temperature rise caused by traditional conduction through a guide rod and a connecting structure is solved, and meanwhile, the compression bar and the nut can be made of steel materials, so that the mechanical strength is higher, and the cost is lower;

the end part of the pressure lever is provided with the hexagonal prism structure, the position of the pressure lever relative to the bracket can be adjusted by matching with tools such as a spanner, and meanwhile, the pressure lever is fastened by adopting a screw;

the static contact seat adopts a fillet copper busbar, so that reliable electric contact is realized, and the current carrying capacity is improved.

Drawings

Fig. 1 is a schematic structural diagram of a first embodiment of the present invention;

fig. 2 is a schematic view of a transmission device according to a first embodiment of the present invention;

fig. 3 is a schematic view of a pressure regulating device according to a first embodiment of the present invention;

FIG. 4 is a cross-sectional view of section A-A of FIG. 3;

description of the figures reference signs: the device comprises a transmission device 1, a bearing 10, a transmission main shaft 11, a movable device 12, a cam 13, a pulley 14, a short pin 15, a pressure adjusting device 2, a pressure maintaining spring 20, a vacuum pull rod 21, a connecting plate 22, an arc extinguishing chamber 23, a static contact seat 24, a pressure rod 25, a support 26, a fixing nut 27, a fastening nut 28, a screw 29 and an insulating plate 3.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.

It should be noted that the drawings provided in the following embodiments are only for illustrating the basic concept of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the form, amount and ratio of the components in actual implementation may be changed at will, and the layout of the components may be more complicated.

The first embodiment is as follows:

as shown in fig. 1, a vacuum circuit breaker with adjustable contact pressure of a gas insulated ring main unit includes a movable device 1, a pressure adjusting device 2 and an insulating plate 3. The mobile device 1 is arranged on the insulating plate 3. The pressure adjusting devices 2 are three groups, and the three groups of pressure adjusting devices 2 are correspondingly arranged on the movable device 1; the pressure regulating device 2 is also connected to an insulating plate 3. The two insulation plates 3 are symmetrically arranged on two sides of the movable device 1 and the pressure adjusting device 2. The three sets of pressure adjusting devices 2 correspond to three-phase voltages, respectively.

As shown in fig. 2, the movable device 1 includes a transmission main shaft 11, a bearing 10, and a transmission device 12, and the bearing 10 and the transmission device 12 are disposed on the transmission main shaft 11. The bearing 10 is provided at one end of the drive spindle 11, and the drive spindle 11 is rotatable about an axis by the bearing 10. The dynamic sealing structures are arranged on two sides of the bearing 10, so that the bearing 10 is not influenced by the environment, and the service life is prolonged. The outer ring of the bearing 10 is fixedly connected with the two insulating plates 3 respectively. The transmission devices 12 have three groups, and correspond to the three groups of pressure adjusting devices 2; the transmission 12 includes a cam 13 and a pulley 14. The cam 13 is fixedly connected with the transmission main shaft 11, an arc-shaped hollow is arranged on the cam 13, one end of the arc-shaped hollow is close to the transmission main shaft 11, and the other end of the arc-shaped hollow is far away from the transmission main shaft 11. A pulley 14 is arranged in the arc-shaped hollow of the cam 13, and the pulley 14 can move along the arc-shaped hollow. In order to ensure that the movement track of the pulley 14 is up and down when the cam 13 rotates, support plates are further arranged on two sides of the cam 13, the support plates are arranged perpendicular to the axis of the transmission main shaft 11, and two ends of each support plate are fixedly connected with the insulation plates 3 on two sides. The support plate is provided with vertical hollows. In order to further stabilize the connection of the brace, the brace is sleeved on the transmission main shaft 11, and the brace can rotate around the transmission main shaft 11. A vacuum pull rod 21 in the pressure regulating device is connected with the pulley 14 through a short pin 15; the two ends of the short pin 15 extend outwards and are arranged in the vertical hollows of the support plate. In the implementation process, the cam 13 rotates along with the rotation of the transmission main shaft 11, wherein the transmission main shaft 11 rotates back and forth within a set angle; the pulley 14 acts in an arc-shaped hollow arranged on the cam 13, and the pulley 14 is limited in motion track by the vertical hollow on the support plate, so that the pulley 14 moves up and down along with the reciprocating rotation of the cam 13; the action of the pulley 14 drives the vacuum pull rod 21 to move up and down.

As shown in fig. 3 and 4, the pressure adjusting device 2 includes a vacuum rod 21, a holding spring 20, a flexible copper connection 22, an arc extinguishing chamber 23, a pressure rod 25, a stationary contact 24, and a bracket 26. The arc chute 23 comprises a stationary end and a moving end, the moving end of the arc chute being capable of moving along the inner wall of the arc chute. The movable end and the static end of the arc extinguish chamber are both provided with terminals, wherein the terminals of the movable end and the static end are arranged in the arc extinguish chamber. A vacuum pull rod 21 is arranged at the movable end of the arc extinguish chamber 23, and the vacuum pull rod 21 is in threaded connection with the movable end of the arc extinguish chamber; the stationary end of the arc chute 23 is also provided with a press rod 25 and a stationary contact 24. The pressure maintaining spring 20 is arranged between the movable device 1 and the arc extinguishing chamber 23, and the pressure maintaining spring 20 is sleeved on the outer side of the vacuum pull rod 21. In order to realize the conductivity and simultaneously ensure the balance of the elastic force exerted by the holding pressure spring 20 and reduce the influence of thermal expansion and cold contraction of the device, a copper flexible connection 22 is also arranged between the holding pressure spring 20 and the arc extinguish chamber 23. The copper flexible connection 22 is sleeved at the moving end of the arc extinguish chamber 23, the copper flexible connection 22 is fixedly connected with the arc extinguish chamber 23, and two ends of the copper flexible connection 22 penetrate through the insulating plate 3 to be connected with the primary loop. The primary loop refers to a primary loop of the ring main unit.

The static end of the arc extinguish chamber 23 is provided with a threaded hole, a screw 29 penetrates through the pressure rod 25 and the static contact seat 24 and is in threaded connection with the threaded hole at the static end of the arc extinguish chamber 23, the screw 29 is a socket head cap screw 29 in the embodiment, and the screw 29 is made of steel materials. The fixing of the pressure lever 25 on the arc extinguishing chamber 23 can be achieved by tightening the screw 29, and the pressure lever 25 clamps the stationary contact 24, thereby achieving the fixing of the stationary contact 24. The end face of the static end of the arc extinguish chamber 23 is of a plane structure, conductive materials including copper, silver and the like are adopted, and when the arc extinguish chamber 23 is attached to the static contact seat 24, the arc extinguish chamber has more stable conductive performance. The stationary contact seat 24 is located between the pressure bar 25 and the arc extinguish chamber 23, and serves as a switch seat of the isolation knife, in the embodiment, the stationary contact seat 24 is a fillet copper busbar, and the vertical section of the stationary contact seat is in an L shape. One end of the static contact seat 24 is provided with a through hole, the aperture of the through hole is smaller than the outer diameter of the pressure rod 25, and the through hole is used for penetrating through a screw 29. The whole compression bar 25 is hollow and cylindrical, one end of the compression bar 25 is provided with a hexagonal prism structure similar to a hexagon nut, and the end, provided with the hexagonal prism structure, of the compression bar 25 is far away from the arc extinguish chamber 23 during connection. The pressure lever 25 is internally provided with a through hole for passing through a screw 29; the periphery of the pressure lever 25 is provided with threads; the press rod 25 is made of steel. The support 26 is sleeved on the outer side of the pressure rod 25, one surface of the support 26 is welded with a fixing nut 27, and the fixing nut 27 is connected with the external thread of the pressure rod 25; in order to further fix the bracket 26, a fastening nut 28 is arranged on the other surface of the bracket 26, and the bracket 26 is connected with the pressure rod 25 by screwing the fastening nut 28; the fastening nut 28 and the fixing nut 27 are made of steel. In this embodiment, the fixing nut 27 is disposed between the bracket 26 and the arc-extinguishing chamber 23, and the fastening nut 28 is disposed on a surface of the bracket 26 away from the arc-extinguishing chamber 23, because there is a complicated structure around the arc-extinguishing chamber 23, the surface away from the arc-extinguishing chamber 23 is convenient to operate. It should be noted that in some other embodiments, only one fixing nut 27 can be used to connect the pressing rod 25 and the bracket 26. The sides of the bracket 26 extend in a direction perpendicular to the plane of the bracket 26; the extension part of the side surface of the bracket 26 is attached to the insulating plates 3 at two sides and is connected with the insulating plates through threads; the extension part of the side surface of the bracket 26 is also connected with a kidney-shaped hole arranged on the static contact seat 24, wherein the side surface of the bracket 26 connected with the static contact seat 24 is vertical to the side surface of the bracket 26 attached with the insulating plate 3. The waist-shaped holes and the through holes on the static contact seat 24 are respectively positioned on two surfaces of the static contact seat 24. The direction of the long edge of the waist-shaped hole on the stationary contact seat 24 is the vertical direction, so that the stationary contact seat 24 can be conveniently adjusted in the vertical direction. The fixed contact seat 24 is fixed by arranging a waist-shaped hole on the fixed contact seat 24 to be connected with the support 26 and arranging a through hole to be sleeved on the screw 29.

In order to prevent the screw 29 from protruding from the end surface of the pressure lever 25 when the screw 29 fixes the pressure lever 25, a cylindrical hole with a larger diameter is provided at one end of the through hole inside the pressure lever 25 close to the hexagonal prism structure, that is, the diameter of the through hole at the end close to the hexagonal prism structure is enlarged, so that the screw 29 can be fitted into the through hole.

In order to ensure that the arc extinguish chamber 23 is stable and does not shake, a fixing plate is further arranged on the periphery of the arc extinguish chamber 23 and perpendicular to the two insulating plates 3, and the two sides of the fixing plate respectively abut against the inner sides of the two insulating plates 3. The contact position of the edge of the fixed plate and the insulating plate 3 extends towards two sides along the direction vertical to the fixed plate, so that the contact area of the fixed plate and the insulating plate 3 is increased, and the contact reliability is ensured.

In the implementation process, one end of the pressure lever 25 with a hexagonal prism structure is adjusted through a tool such as a wrench, so that the relative position of the pressure lever 25 and the bracket 26 is adjusted, and the adjustment of the compression amount of the pressure maintaining spring 20 is realized; and after the position of the pressure lever 25 is adjusted, the fastening nut 28 is screwed to fix the pressure lever 25 and the bracket 26, and the socket head cap screw 29 is screwed to fix the pressure lever 25 and the arc extinguish chamber 23. Along with the rotation of the transmission main shaft 11, the cam 13 drives the vacuum pull rod 21 to move up and down, and then the vacuum pull rod 21 and the static end terminal of the arc extinguish chamber 23 are separated and combined. In the embodiment, because the press rod 25 and the fixing nut 27 and the fastening nut 28 on the bracket 26 are all made of steel, the mechanical strength is stronger, and the service life is effectively prolonged; on the other hand, the static contact seat 24 is attached to the plane at the bottom of the arc extinguish chamber 23, so that reliable electric contact is realized, the current carrying capacity is improved, and local temperature rise is avoided.

The above description is only one specific example of the present invention and does not constitute any limitation to the present invention. It will be apparent to those skilled in the art that various modifications and variations in form and detail may be made without departing from the principles and structures of the invention without departing from the spirit and scope of the invention, but such modifications and variations are within the purview of the appended claims.

Claims

1. A contact pressure adjustable ring main unit vacuum circuit breaker is characterized by comprising a movable device, a pressure adjusting device and an insulating plate; the movable device is arranged on the insulating plate; the pressure adjusting device is arranged on the movable device and is also connected with the insulating plate; the pressure adjusting device comprises an arc extinguish chamber, a pressure rod, a static contact seat and a bracket; a threaded hole is formed in the static end of the arc extinguish chamber; a screw is arranged to penetrate through the pressure rod and the static contact seat and is in threaded connection with a threaded hole at the static end of the arc extinguish chamber; the pressure lever is provided with external threads and is connected with the bracket through a nut; the two insulation plates are symmetrically arranged on two sides of the movable device and the pressure adjusting device; the transmission devices are three groups, and three groups of pressure adjusting devices are correspondingly arranged.

2. The ring main unit vacuum circuit breaker with the adjustable contact pressure as claimed in claim 1, wherein the end surface of the arc extinguish chamber is a plane; the static end of the arc extinguish chamber is attached to the static contact seat.

3. The ring main unit vacuum circuit breaker with the adjustable contact pressure as claimed in claim 1, wherein one end of the pressure lever is provided with a hexagonal prism structure; the pressure lever is internally provided with a through hole for passing through a screw.

4. The ring main unit vacuum circuit breaker with the adjustable contact pressure as claimed in claim 1, wherein a fixing nut is welded to one surface of the support and is connected with an external thread of the pressure lever; the other side of the bracket is provided with a fastening nut, and the bracket is connected with the pressure rod by screwing the fastening nut; the nut, the screw and the pressure lever are all made of steel materials.

5. The ring main unit vacuum circuit breaker with the adjustable contact pressure as claimed in claim 1, wherein the stationary contact base adopts a fillet copper busbar, and a vertical section of the stationary contact base is L-shaped; one surface of the static contact seat is provided with a through hole, and the through hole is used for penetrating through a screw; the other surface of the stationary contact seat is provided with a waist-shaped hole which is connected with the bracket through the waist-shaped hole.

6. The ring main unit vacuum circuit breaker with the adjustable contact pressure as claimed in claim 5, wherein the side edge of the bracket extends in a direction perpendicular to the plane of the bracket; the extension part on the side surface of the bracket is attached to the insulating plate; the extending part of the side surface of the bracket is also connected with a waist-shaped hole arranged on the static contact seat.

7. The ring main unit vacuum circuit breaker with the adjustable contact pressure according to claim 1, wherein the pressure adjusting device further comprises a vacuum pull rod, a pressure maintaining spring and a copper flexible connection, wherein the vacuum pull rod is arranged at a moving end of the arc extinguish chamber; the pressure maintaining spring is arranged between the movable device and the arc extinguish chamber and sleeved on the outer side of the vacuum pull rod; a copper flexible connection is arranged between the pressure maintaining spring and the arc extinguish chamber; the copper flexible connection sleeve is connected to the moving end of the arc extinguish chamber, the copper flexible connection sleeve is fixedly connected with the arc extinguish chamber, and the two ends of the copper flexible connection sleeve penetrate through the insulating plate to be connected with the primary loop.

8. The ring main unit vacuum circuit breaker with the adjustable contact pressure as claimed in claim 7, wherein the moving device comprises a transmission main shaft, a bearing and a transmission device; the bearing and the transmission device are arranged on the transmission main shaft; the bearing is arranged at one end of the transmission main shaft; two sides of the bearing are provided with dynamic sealing structures; the outer ring of the bearing is fixedly connected with the insulating plate.

9. The ring main unit vacuum circuit breaker with the adjustable contact pressure as claimed in claim 8, wherein the transmission device comprises a cam and a pulley; the cam is fixedly connected with the transmission main shaft, an arc-shaped hollow is arranged on the cam, one end of the arc-shaped hollow is close to the transmission main shaft, and the other end of the arc-shaped hollow is far away from the transmission main shaft; a pulley is arranged in the arc-shaped hollow of the cam and can move along the arc-shaped hollow; support plates are arranged on two sides of the cam, and two ends of each support plate are fixedly connected with the insulation plates on the two sides; the support plate is sleeved on the transmission main shaft and can rotate around the transmission main shaft; the support plate is provided with a vertical hollow part; the vacuum pull rod in the pressure device is connected with the pulley through a short pin; the two ends of the short pin extend outwards and are arranged in the vertical hollow parts of the support plate.

10. The vacuum circuit breaker with the contact pressure adjustable in the ring main unit according to claim 3, wherein the diameter of the through hole in the pressure lever near one end of the hexagonal prism structure is enlarged, so that a screw can be embedded in the through hole; the periphery of the arc extinguish chamber is also provided with a fixed plate; two sides of the fixed plate are respectively abutted against the two insulating plates.