CN112993837A

CN112993837A - Switch cabinet

Info

Publication number: CN112993837A
Application number: CN201911282311.0A
Authority: CN
Inventors: 杨洋
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-12-13
Filing date: 2019-12-13
Publication date: 2021-06-18

Abstract

The invention relates to a switchgear comprising: -a frame; -a primary contact block arranged on the frame and linearly movable between a disconnected position and a connected position; -an auxiliary contact block arranged on the frame and movable parallel to the main contact block between a disconnected position and a connected position; -an operating lever having an axis; -a main operating element and an auxiliary operating element arranged on the shaft of the operating lever; and-a main lever system and an auxiliary lever system connected between the respective operating element and contact block, such that when the operating lever is rotated, the main contact block and the auxiliary contact block.

Description

Switch cabinet

Technical Field

The present invention relates to a switchgear cabinet, for example for medium voltage applications.

Background

The switchgear is usually arranged in a cabinet. The rear wall of this cabinet is provided with a main bus bar to which the switchgear cabinet needs to be connected.

Such a switchgear comprises a safety circuit and an actuator to provide or break contact between the busbars. The switchgear cabinet provides electrical power, for example, to devices such as pumps, motors or electrically operated valves, which are switched from the main bus by this switchgear cabinet, and ensures that the electrical power can be easily switched off and on. Furthermore, auxiliary contacts for testing purposes are provided.

Such switch cabinets are usually arranged in drawers of the cabinet. This facilitates the replacement of the switchgear when a fault is detected.

For maintenance and problem solving, it is necessary that the switchgear can be tested. For this purpose, the switchgear cabinet must be disconnected from the bus bar. It is also desirable that in such a test position the switch cabinet is still connected to the auxiliary connector so that different components of the switch cabinet can be tested.

With a typical draw-out switch, the switch is partially pulled out of the cabinet so that the draw-out switch is separated from the bus bar and the switchgear can be tested. In this test position, the switch cabinet is connected or still connected to the auxiliary connector for testing the switch cabinet.

The draw-out switch is pulled out further to actually open the switchgear. In this position, the draw-out switchgear can be safely removed.

Known draw-out switchgear devices are manually operated to position them in a desired position. This position is usually indicated by means of a marking arranged on the base frame. However, it is difficult to accurately position the switching device at the correct position.

Some known draw-out switchgear devices have a positioning device, wherein one has to use a ratchet to rotate a screw shaft, which moves a rack with the switchgear. The positioning device is provided with an indicator for indicating the position of the drawout switchgear to be moved. The use of a ratchet wheel to rotate the screw shaft requires a relatively long time to move the switching device to a desired position.

Another disadvantage is that the draw-out switchgear extends from the cabinet when the draw-out switchgear is placed in the testing position or the off position.

Disclosure of Invention

It is an object of the present invention to reduce or even eliminate the above mentioned disadvantages.

This object is achieved with a switchgear cabinet according to the invention, comprising:

-a frame;

-a primary contact block arranged on the frame and linearly movable between a disconnected position and a connected position;

-an auxiliary contact block arranged on the frame and movable parallel to the main contact block between a disconnected position and a connected position;

-an operating lever having an axis;

-a main operating element and an auxiliary operating element arranged on the shaft of the operating lever; and

-a main bar system and an auxiliary bar system connected between the respective operating element and contact block, such that when the operating bar is rotated, the main contact block and the auxiliary contact block move linearly.

Since the main contact block and the auxiliary contact block are movably arranged on the frame, it is no longer necessary to move the frame (i.e. to pull out the drawer) in order to bring the switchgear into the test position or the open position.

By rotating the operating lever, the main contact block and the auxiliary contact block are moved between their respective positions. Rotation of the shaft will cause the primary and secondary operating members to rotate. This rotation will be transferred by the respective lever system to the respective contact block such that first the auxiliary contact block is moved to the connection position and then the main contact block is moved to be connected with the busbar.

In a preferred embodiment of the switchgear according to the invention, the main operating element and the auxiliary operating element are rotationally displaced relative to each other. The rotational displacement of the operating element ensures that, for example, upon rotation of the shaft, the auxiliary contact block starts to move first and, after further rotation of the shaft, the main contact block starts to move. As a result, the auxiliary contact block will be connected first, and only after further rotation of the shaft will the main contact block be connected. When rotating the shaft in the opposite direction, the main contact block will be disconnected first, after which the auxiliary contact block will be disconnected.

In a further preferred embodiment of the switchgear cabinet according to the invention, at least one of the main operating element and the auxiliary operating element comprises a toothed sector arranged on the shaft and a toothed rack arranged on the respective lever system.

When the shaft rotates, the sector gear will change in angular position, enabling the rack to move in a linear direction. This linear movement will be transferred to one of the contact blocks by the lever system.

When the two sector gears are arranged on the shaft, both the main contact block and the auxiliary contact block can be moved from the disconnected position to the connected position. By means of the angular displacement between the two sector gears, it can be ensured that upon rotation of the shaft, the auxiliary contact block is first moved to bring the switchgear into the testing position, and then the main contact block can be moved to bring the switchgear into the connecting position.

In another preferred embodiment of the switchgear according to the invention, at least one of the main operating element and the auxiliary operating element comprises a cam arranged on the shaft and a cam follower arranged on the respective lever system.

When the cam is rotated by the rotation axis, the cam follower will follow the curve of the cam. A change in radial distance from the shaft to the cam surface will cause the cam follower to move linearly, which will be transferred to the respective contact block by the lever system.

Two cams, or one cam and a sector gear, may be provided on the shaft. By selecting the angular displacement between the two cams, or between one cam and the sector gear, one can ensure that the auxiliary contact block is moved first, and then the main contact block.

In another embodiment of the switchgear according to the invention, at least one of the main operating element and the auxiliary operating element comprises a guide slot arranged on the shaft and a follower pin extending in the guide slot, the follower pin being connected to the respective lever system.

The guide slot with follower pin functions similarly to a cam and cam follower, but has the advantage of: in addition to being able to generate a pushing force, a pulling force can also be generated.

In another embodiment of the switchgear panel according to the invention, at least one of the main bar system and the auxiliary bar system comprises an L-shaped bar element having a hinge point at its bend to provide a movement amplification.

By means of the L-shaped bar element, one can provide a transmission to increase or decrease the moving operating element so that the stroke of the operating element results in the correct stroke of the corresponding contact block. Furthermore, the L-shaped bar element can provide a change of direction of the linear movement depending on the angle between the arms of the L-shaped bar element.

In another embodiment of the switchgear cabinet according to the invention, the bar system comprises at least three bars connected to each other by sliding hinge points. By means of the sliding direction of the hinge point at different angles, the direction of the linear movement of the operating element can be changed.

A further embodiment of the switchgear cabinet according to the invention further comprises a drive means, such as an electric motor, for rotating the shaft of the operating rod.

Since the movement of the main contact block and the auxiliary contact block can be affected by the rotation of the shaft, it can be easily automated by rotating the shaft with the driving means. This enables the electrical driving of the operating lever, so that different switch cabinets can be controlled, for example, by a computer.

Drawings

These and other features of the present invention will be explained in conjunction with the accompanying drawings.

Fig. 1 shows a schematic perspective view of a switchgear cabinet according to the invention.

Fig. 2 shows a partial perspective view of a first embodiment of the invention.

Fig. 3 shows a schematic top view of the first embodiment.

Fig. 4 shows a partial perspective view of a second embodiment of the invention.

Fig. 5 shows a schematic top view of a second embodiment.

Fig. 6 shows a partial perspective view of a third embodiment of the invention.

Fig. 7 shows a schematic top view of a third embodiment.

Detailed Description

Fig. 1 shows a withdrawable switch 1, which is usually arranged in a cabinet (not shown). In such a cabinet a bus bar 2 is arranged for supplying the draw-out switch 1 with electrical energy. This electrical energy is supplied to the draw-out switch via the main contact block 3.

Furthermore, the withdrawable switch 1 has an auxiliary contact block 4 which can be brought into contact with a contactor 5 arranged in the cabinet, so that different components of the switchgear can be tested.

As described hereinbefore, it is required that the switchgear 1 can be placed in a position where both the main contact block 3 and the auxiliary contact block 4 are disconnected, in a position where only the auxiliary contact block 4 is connected, and in a position where both the contact blocks 3 and 4 are connected. According to the invention, this is achieved by a linear movement of the main contact block 3 and a linear movement of the auxiliary block 4. This movement is obtained by rotating the operating lever 6.

Fig. 2 and 3 show a first exemplary embodiment of a switchgear cabinet 10 according to the invention. The operating lever 6 has a shaft 11, on which shaft 11 two

toothed segments

12, 13 are arranged. These sector gears 12, 13 mesh with

racks

14, 15, respectively.

When the shaft 11 is rotated, the

gear segments

12, 13 will engage the

racks

14, 15 and cause the

racks

14, 15 to move linearly.

Since the two sector gears 12, 13 are arranged with a relative angular displacement, the engagement of the sector gear 13 with the toothed rack 15 will be later than the engagement of the sector gear 12 with the toothed rack 14.

As shown in fig. 3, the

racks

14, 15 are connected to respective rod systems. The rack 14 is connected to a rod system consisting of the rack 14, a sliding hinge point 16, a connecting rod 17, a sliding hinge point 18 and a push rod 19. The toothed rack 15 is connected to a rod system consisting of toothed rack 15, sliding hinge point 20, connecting rod 21, sliding hinge point 22 and push rod 23.

These bar systems transfer the linear movement of the two

racks

14, 15 to the

respective contact blocks

4 and 5. In fig. 3, it is shown that the sector gear 12 has engaged the rack 14, so that the auxiliary contact block 4 is moved into contact with the contactor 5. The sector gear 13 is shown beginning to mesh with the rack 15 so that on further rotation of the shaft 11 the main contact block moves into contact with the busbar 2.

Fig. 4 and 5 show a second embodiment 30 of the invention. In this embodiment 30, the shaft 31 of the operating lever 6 is provided with two cams 323, 3. These cams 323, 3 move the cam followers 343, 5, respectively, so that linear movement is obtained. The cam follower 34 will move first due to the angular displacement of the

cams

32, 33. This achieves the correct timing of the movement of the main contact block 3 and the auxiliary contact block 4.

The cam followers 343, 5 push the L-shaped bar elements 383, 9, respectively, each L-shaped bar element 383, 9 in turn pushing the push rods 404, 1, respectively, to push the auxiliary contact block 4 and the main contact block 3 into the connected position. The

push rods

40, 41 are pushed by the springs 363, 7 against the L-shaped lever elements 383, 9, so that the contact block 34 can also be brought back into the open position.

By varying the length of the arms of the L-shaped bar elements 383, 9 one can set the amplification factor between the stroke of the cam followers 343, 5 and the stroke required by the

push rods

40, 41 so that the main contact block 3 and the auxiliary contact block 4 can be moved into full contact with the busbar 2 and the contactor 5, respectively.

Fig. 6 shows a partial perspective view of a third embodiment 50 according to the present invention. This embodiment 50 functions similarly to the second embodiment 30.

In the third embodiment 50, the shaft 51 of the operating lever 6 is provided with two

discs

52, 53. Each

disc

52, 53 is provided with guide grooves 54, 55 on both axial faces, respectively.

The two

levers

56, 57 are provided with

forks

58, 59, respectively, the

forks

58, 59 having, at the free ends of the

forks

58, 59, follower pins 60 extending in the respective slots 54, 55.

When the shaft 51 is rotated by the operating lever 6, the

discs

52, 53 with the guide grooves 54, 55 will rotate, causing the

rods

56, 57 to move linearly.

As shown in fig. 7, the linear movement of the

levers

56, 57 is transferred to lever

members

63, 64 connected to the auxiliary contact block 4 and the main contact block 3, respectively, through L-shaped lever members 61, 62.

Claims

1. A switchgear cabinet comprising:

-a frame;

-an operating lever having an axis;

2. Switchgear according to claim 1, wherein the main operating element and the auxiliary operating element are rotationally displaced with respect to each other.

3. Switchgear according to claim 1 or 2, wherein at least one of the main operating element and the auxiliary operating element comprises a sector gear arranged on the shaft and a rack arranged on the respective lever system.

4. Switchgear according to any of the preceding claims, wherein at least one of the main operating element and the auxiliary operating element comprises a cam arranged on the shaft and a cam follower arranged on the respective lever system.

5. Switchgear according to any of the preceding claims, wherein at least one of the main operating element and the auxiliary operating element comprises a guide slot arranged on the shaft and a follower pin extending in the guide slot, the follower pin being connected to the respective lever system.

6. Switchgear according to any of the preceding claims, wherein at least one of said main bar system and said auxiliary bar system comprises an L-shaped bar element having a hinge point at its bend to provide a movement amplification.

7. Switchgear according to any of the preceding claims, wherein the bar system comprises at least three bars connected to each other by sliding hinge points.

8. Switchgear according to any of the preceding claims, further comprising drive means for rotating the shaft of the operating lever, such as an electric motor.