CN112466705B

CN112466705B - A switch cabinet

Info

Publication number: CN112466705B
Application number: CN201910848627.5A
Authority: CN
Inventors: 袁丽丹; 岳浩然; 刘卫涛; 乔文
Original assignee: Henan Senyuan Electric Co Ltd
Current assignee: Henan Senyuan Electric Co Ltd
Priority date: 2019-09-09
Filing date: 2019-09-09
Publication date: 2025-10-28
Anticipated expiration: 2039-09-09
Also published as: CN112466705A

Abstract

The invention relates to a switch cabinet which comprises a cabinet body, a bus external connection structure, a bus, a three-station switch, a bus grounding switch, a grounding moving contact and a driving mechanism, wherein the bus is arranged on the cabinet body and is positioned in the cabinet body and is connected to the bus external connection structure in a conductive mode, the three-station switch is arranged in the cabinet body and is provided with a grounding station, an isolating station and a conducting station which is connected with the bus in a conductive mode, the bus grounding switch comprises a grounding static contact seat and a grounding moving contact which are arranged in the cabinet body, the grounding static contact seat is connected with the bus in a conductive mode, and the grounding moving contact is used for being connected with the grounding moving contact in a grounding mode and is driven to conduct and break with the grounding static contact seat by the driving mechanism. When the switch cabinet is required to be overhauled, the knife switch of the three-position switch is rotated to the grounding station, so that the whole switch cabinet is not electrified, and then the grounding movable contact of the bus grounding switch is communicated with the grounding static contact seat, and the bus is grounded at the moment, so that the electric charge in the bus is eliminated, and the safety of overhaulers is ensured.

Description

Switch cabinet

Technical Field

The invention relates to a switch cabinet.

Background

When the switch cabinet is overhauled, the switch cabinet is generally grounded through a three-station switch in the switch cabinet body. The utility model discloses a three-position switch structure for an electrical cabinet, which comprises a cabinet body and a three-position switch arranged in the cabinet body, wherein the three-position switch comprises an isolation fixed contact, a grounding fixed contact and a rotary knife switch, and the rotary knife switch is provided with a grounding position communicated with the grounding fixed contact, a conducting position communicated with the isolation fixed contact and an isolation position simultaneously disconnected with the isolation fixed contact and the grounding fixed contact in a rotary stroke.

When the switch cabinet is overhauled, the rotary knife switch needs to be rotated to the grounding station, so that the whole switch cabinet is grounded, and the whole switch cabinet is not electrified. Because the bus may have residual charges, before maintenance, a worker still needs to hold the detection device to detect whether the bus is electrified, and potential safety hazards exist.

Disclosure of Invention

The invention aims to provide a switch cabinet, which solves the technical problem that in the prior art, a worker is required to hold a detection device to detect whether a bus is electrified or not when the switch cabinet is overhauled, so that potential safety hazards exist.

In order to achieve the above purpose, the technical scheme of the switch cabinet of the invention is as follows:

The switch cabinet comprises a cabinet body, a bus external structure, a bus, a three-station switch, a bus grounding switch, a grounding static contact seat and a grounding moving contact, wherein the bus external structure is arranged on the cabinet body, the bus is positioned in the cabinet body and is electrically connected to the bus external structure, the three-station switch is arranged in the cabinet body and is provided with a grounding station, an isolating station and a conducting station electrically connected with the bus, the bus grounding switch comprises a grounding static contact seat and a grounding moving contact, the grounding static contact seat is arranged in the cabinet body and is electrically connected with the bus, and the grounding moving contact is used for grounding connection and is driven by a corresponding driving mechanism to conduct and break with the grounding static contact seat.

The three-station switch has the advantages that when the switch cabinet is normally used, the switch blades of the three-station switch are in the conduction station, the three grounding movable contacts are disconnected from the corresponding grounding static contact seats, the switch cabinet can normally work at the moment, when the switch cabinet is required to be overhauled, the switch blades of the three-station switch are rotated to the grounding station, the whole switch cabinet is not electrified, in order to prevent the bus from possibly remaining charges, the grounding movable contacts of the bus grounding switch are conducted with the grounding static contact seats, and at the moment, the bus is grounded to eliminate charges in the bus, so that the safety of overhaulers is ensured.

Further, the bus external connection structure is arranged at the top of the cabinet body, the three-station switch is arranged at the bottom of the cabinet body, and the bus grounding switch is arranged between the bus external connection structure and the three-station switch.

The switch cabinet has the beneficial effects that the switch cabinet is arranged at the top of the cabinet body in a structure which is externally connected with the bus.

Further, the ground moving contact reciprocates along the left-right direction, the ground moving contact is arranged on the right side of the cabinet body, and the driving mechanism and the operating mechanism of the three-station switch are both arranged on the right side wall of the cabinet body.

Further, the grounding moving contact is assembled in the cabinet body in a straight reciprocating manner.

The grounding movable contact is assembled in the cabinet body in a straight-moving and reciprocating mode, the occupied space of the grounding movable contact can be reduced, and the bus grounding switch can be assembled in the cabinet body under the condition that the external size of the cabinet body is unchanged.

Further, a cylindrical grounding contact seat is fixedly arranged on the inner wall of the cabinet body and used for grounding connection, the grounding moving contact is electrically conductive and slidingly assembled in the grounding contact seat, the output end of the driving mechanism is connected with a screw rod in a transmission manner, and the grounding moving contact is spirally assembled on the screw rod so that the grounding moving contact moves along the axial direction of the screw rod when the screw rod is driven by the driving mechanism.

Further, the bus grounding switch is a three-phase bus grounding switch, and three grounding moving contacts of the three-phase bus grounding switch share one driving mechanism.

The three-phase bus grounding switch has the advantages that the three-phase bus grounding switch is suitable for most switch cabinets with three-phase buses, and the three grounding moving contacts share one driving mechanism, so that the cost can be reduced, and the size of the switch cabinet is reduced.

Further, each grounding moving contact is in transmission connection with a transmission piece, each transmission piece is provided with a chain wheel, any two adjacent transmission pieces are matched with the chain wheel through a chain to realize linkage, and one transmission piece in each transmission piece is in transmission connection with an output shaft of the driving mechanism.

Further, an insulator is fixedly arranged on the inner wall of the cabinet body, and the grounding static contact seat is fixedly connected to the insulator.

The grounding static contact base is fixedly arranged on the inner wall of the cabinet body through the insulator, so that the stability of the grounding static contact base and the grounding movable contact during the plug-in connection can be ensured.

Further, the bus bar is arranged between the insulator and the grounding static contact seat.

The bus has the beneficial effects that the space in the cabinet body can be effectively utilized, and the stability of the bus is ensured.

Further, the switch cabinet is an air charging cabinet.

Drawings

Fig. 1 is a schematic diagram of a switch cabinet (driving mechanism is not shown) according to the present invention;

FIG. 2 is a schematic diagram of the bus grounding switch in FIG. 1;

FIG. 3 is a schematic view of the three screw linkage of FIG. 2;

The device comprises a 1-cabinet body, a 2-chain, a 3-grounding busbar, a 4-backing plate, a 5-grounding contact seat, a 6-operating mechanism, a 7-three-station switch, an 8-grounding static contact, a 9-isolation static contact, a 10-bus, a 11-insulator, a 12-grounding static contact seat, a 13-chain wheel, a 14-driving mechanism, a 15-driving piece, a 16-grounding moving contact, a 17-watchband contact finger, a 18-screw, a 19-guiding protrusion, a 20-side wall and a 21-bus external structure.

Detailed Description

Embodiments of the present invention will be further described with reference to the accompanying drawings.

Specific embodiments of the switch cabinet of the present invention:

As shown in fig. 1, the switch cabinet comprises a cabinet body 1, wherein a three-position switch 7 is arranged in the cabinet body 1, the three-position switch 7 is driven by an operating mechanism 6, and the three-position switch 7 is provided with a grounding position communicated with a grounding fixed contact 8, a conducting position communicated with an isolation fixed contact 9 and an isolation position simultaneously disconnected with the isolation fixed contact and the grounding fixed contact. The isolation static contact 9 in this embodiment is fixed on the side wall 20 of the cabinet body 1 through an insulator, the isolation static contact 9 is electrically and fixedly connected with one end of the bus 10, the other end of the bus 10 is electrically connected with the bus external connection structure 21, and specifically, the bus external connection structure 21 is a bus sleeve.

In this embodiment, the external bus structure 21 is fixedly arranged at the top of the cabinet body 1, the three-station switch 7 is arranged at the bottom of the cabinet body 1, and a bus grounding switch is arranged between the external bus structure 21 and the three-station switch 7. In other embodiments, the bus external connection structure may be a bus connector with an authorized bulletin number CN208256566U, where the bus is horizontally arranged, and the bus grounding switch may be disposed above the bus.

Specifically, the bus grounding switch includes a grounding static contact seat 12 and a grounding moving contact 16, as shown in fig. 2, an insulator 11 is fixedly arranged on a side wall 20, and the grounding static contact seat 12 is fixedly assembled on the insulator 11 through a fastening bolt, so as to ensure the stability of the grounding static contact seat 12 when being inserted into the grounding moving contact 16. Wherein, the bus bar 10 is clamped between the grounding static contact seat 12 and the insulator 11, and the bus bar 10 is electrically connected with the grounding static contact seat 12. In other embodiments, the grounded static contact may be directly fixed to the bus bar with sufficient stability of the bus bar itself. Or the insulator is fixed on the side wall, the grounding static contact seat is fixed on the insulator, and the grounding static contact seat is in flexible connection with the bus.

As shown in fig. 2, the side wall 20 is fixedly provided with a grounding contact seat 5, the grounding contact seat 5 is slidably provided with a grounding moving contact 16, and the grounding moving contact 16 is spirally assembled on a screw 18 and is driven to reciprocate by the screw 18. Specifically, the inner wall of the ground contact base 5 is provided with a watchband contact finger 17, and the ground moving contact 16 is electrically connected through the watchband contact finger in the sliding process in the ground contact base 5, and naturally, the watchband contact finger can also be replaced by a spring contact finger. It should be noted that the grounding moving contact 16 is directly moved and reciprocally rotated in the grounding contact seat 5, i.e. the bus grounding switch in this embodiment is a direct-acting structure. In other embodiments, the bus grounding switch may be configured in a swing structure, such as a three-position switch structure, where the bus grounding switch occupies a larger space and the size of the entire cabinet needs to be changed.

In this embodiment, in order to ensure that the ground moving contact 16 can move along the axial direction when the screw 18 rotates, a guiding protrusion 19 is provided on the inner wall of the ground contact base 5, and the guiding protrusion 19 may be a guiding key between the static contact base and the conductive body in the authorized bulletin number CN 105185642B.

In this embodiment, the ground contact base 5 is fixed on the side wall 20 through the pad 4, the pad 4 is a metal conductive plate, the ground busbar 3 is disposed between the pad 4 and the side wall 20, and the ground busbar 3 is electrically connected with the ground contact base 5 through the pad 4.

In this embodiment, the side wall 20 is fixedly provided with a transmission member 15, the transmission member 15 includes a housing fixed on the side wall 20 in a sealing manner and a transmission rod assembled in the housing in a sealing manner in a rotating manner, one end of the transmission rod is fixedly connected with the screw 18 through an expansion pin, the other end of the transmission rod is provided with a sprocket 13, and as shown in fig. 3, two adjacent sprockets 13 of the three sprockets 13 are in transmission connection through the chain 2 to realize linkage. One of the three drive rods is drivingly connected to the drive mechanism 14 to effect the linkage of the three drive rods to synchronize the movement of the three screws 18. In other embodiments, the sprocket may be replaced with a gear, and the three drive rods are coupled by gear engagement. Or each transmission rod is driven by a driving mechanism, so that the cost is increased, and the size of the cabinet body is increased. The transmission member may be a magnetic fluid seal as in the prior art.

In this embodiment, the driving mechanism 14 and the operating mechanism 6 of the three-position switch 7 are both disposed on the right side wall of the cabinet 1.

The switch cabinet in the embodiment is an air-filled cabinet filled with insulating gas. In other implementations, the bus bar grounding switch may be used in other switchgear.

When the switch cabinet is in normal use, the three-position switch 7 drives the knife switch to rotate to the conduction position through the operating mechanism 6, the three grounding movable contacts 16 are disconnected from the corresponding grounding static contact seats 12 through the driving mechanism 14, the switch cabinet can work normally at the moment, when the switch cabinet is required to be overhauled, the knife switch 7 of the three-position switch 7 rotates to the grounding position through the operating mechanism 6, the whole switch cabinet is uncharged, in order to prevent possible residual charges of the bus 10, the driving mechanism 14 drives the grounding movable contacts 16 to extend out of the grounding contact seats 5, the grounding movable contacts 16 are conducted with the grounding static contact seats 12, the bus 10 is grounded at the moment, charges in the bus 10 are eliminated, and the safety of overhaulers is ensured.

Claims

1. Switchgear, including:

Cabinet;

A busbar external connection structure is provided on the cabinet;

A busbar is located in the cabinet and has one end conductively connected to the busbar external connection structure;

A three-position switch, disposed in the cabinet, having a grounding position connected to a grounding static contact, a conduction position connected to an isolating static contact, and an isolation position disconnected from both the grounding static contact and the isolating static contact, wherein the isolating static contact is electrically and fixedly connected to the other end of the busbar;

It is characterized in that the switch cabinet also includes:

A busbar grounding switch, comprising a grounding static contact seat and a grounding movable contact arranged in the cabinet;

The grounding static contact seat is conductively connected to the busbar;

The grounding movable contact is used for grounding connection and is driven to move back and forth by a corresponding driving mechanism to connect and disconnect with the grounding static contact seat.

2. The switch cabinet according to claim 1 is characterized in that the busbar external connection structure is arranged at the top of the cabinet body, the three-position switch is arranged at the bottom of the cabinet body, and the busbar grounding switch is located between the busbar external connection structure and the three-position switch.

3. The switch cabinet according to claim 2 is characterized in that the grounding movable contact reciprocates in the left and right directions, the grounding movable contact is arranged on the right side of the cabinet body, and the driving mechanism and the operating mechanism of the three-position switch are both arranged on the right side wall of the cabinet body.

4. The switch cabinet according to any one of claims 1 to 3, characterized in that the grounding movable contact is directly reciprocatingly assembled inside the cabinet.

5. The switch cabinet according to claim 4 is characterized in that a cylindrical grounding contact seat is fixedly provided on the inner wall of the cabinet body, the grounding contact seat is used for grounding connection, the grounding movable contact is conductively and slidably assembled in the grounding contact seat, the output end of the driving mechanism is transmission-connected with a screw, and the grounding movable contact is spirally assembled on the screw so that the grounding movable contact moves along the axial direction of the screw when the screw is driven by the driving mechanism.

6. The switch cabinet according to any one of claims 1 to 3, characterized in that the busbar grounding switch is a three-phase busbar grounding switch, and the three grounding movable contacts of the three-phase busbar grounding switch share a driving mechanism.

7. The switch cabinet according to claim 6 is characterized in that each grounding moving contact is transmission-connected to a transmission member, each transmission member is provided with a sprocket, any two adjacent transmission members cooperate with the sprocket through a chain to achieve linkage, and one of the transmission members is transmission-connected to the output shaft of the drive mechanism.

8. The switch cabinet according to any one of claims 1 to 3, characterized in that an insulator is fixedly provided on the inner wall of the cabinet body, and the grounding static contact seat is fixedly connected to the insulator.

9 . The switch cabinet according to claim 8 , wherein the busbar is sandwiched between the insulator and the grounding static contact seat.

10. The switch cabinet according to any one of claims 1 to 3, characterized in that the switch cabinet is a gas-filled cabinet.