CN107731615B - A new type of isolation and grounding switch for cable branch box - Google Patents

Abstract

The invention relates to a switch, in particular to a novel isolating and grounding switch for a cable branch box, and belongs to the technical field of electrical equipment. An operation panel is arranged on one side of a shell, an isolation static knife, an isolation switch operation shaft, a grounding static knife and a grounding switch operation shaft which are parallel to each other are sequentially arranged in the shell positioned on the back of the operation panel from top to bottom, an isolation interlocking cam and a grounding interlocking cam are arranged at one end, penetrating through the shell, of the isolation switch operation shaft and the grounding switch operation shaft, a first interlocking plate and a second interlocking plate are arranged between the isolation switch operation shaft and the grounding switch operation shaft, the first interlocking plate is fixed on the back of the operation panel through a fulcrum pin, the second interlocking plate is fixed on the back of the operation panel through a guide screw, an interlocking pin is arranged at the bottom of the operation panel through a bent plate, the isolation switch operation shaft is linked with an isolation movable knife through a pull rod, and the grounding switch operation shaft is connected with a. The isolation and grounding switch can be quickly switched on and off.

Description

A new type of isolation and grounding switch for cable branch box

technical field

The invention relates to a switch, in particular to a novel isolation and grounding switch for a cable branch box, belonging to the technical field of electrical equipment.

Background technique

The 40.5kV American box-type transformer uses a load switch immersed in transformer oil. Since the load switch has no visible fracture, the actual operation or maintenance cannot determine the official live state of the cable side, which seriously threatens the personal safety of operators and maintenance personnel. At present, this kind of American box transformer requires the installation of a cable branch box, and the cable branch box is equipped with an isolation and grounding switch to form a visible isolation fracture to ensure the personal safety of operators and maintenance personnel. However, it is suitable for isolation and grounding switches installed in cable branch boxes. There are no related products with convenient operation and perfect interlocking in the market.

SUMMARY OF THE INVENTION

The purpose of the present invention is to propose a novel isolation and grounding switch for cable branch box, which has reliable interlock and convenient operation, aiming at the defect of inconvenient operation in the prior art.

The present invention solves the technical problem through the following technical solutions: a novel isolation and grounding switch for a cable branch box, comprising a casing, an operation panel is arranged on one side of the casing, and the casing on the back of the operation panel is arranged in order from top to bottom There are parallel isolation static knives, isolation switch operating shafts, grounding static knives and grounding switch operating shafts. One end of the isolating switch operating shaft and grounding switch operating shaft passing through the housing is provided with isolation interlocking cams and grounding interlocks. cam, an interlocking plate 1 and an interlocking plate 2 are arranged between the isolation switch operating shaft and the grounding switch operating shaft, the interlocking plate 1 is fixed on the back of the operation panel by a fulcrum pin, and the interlocking The guide screw is fixed on the back of the operation panel, and the bottom of the operation panel is provided with an interlocking pin through a bent plate. The operating panel is provided with an operating hole of the isolating switch and the operating hole of the grounding switch corresponding to the positions of the operating shaft of the isolating switch and the operating shaft of the grounding switch.

Further, the second interlocking plate is located between the isolation interlocking cam and the grounding interlocking cam, the second interlocking plate is located on the front side of the first interlocking plate, and one end of the interlocking pin is close to the grounding interlocking cam.

One end of the isolating switch operating shaft close to the casing is provided with an isolating quick-action compression spring, one end of the isolating quick-acting pressing spring is connected to the isolating switch operating shaft, and the other end is connected to the inside of the casing; the grounding switch operating shaft passes through The other end of the housing is provided with a grounding quick-action compression spring, one end of the grounding quick-action compression spring is connected to the grounding switch operating shaft, and the other end is connected to the outside of the housing to realize quick closing and opening.

Contact springs are provided on both the isolating movable knife and the grounding movable knife to ensure a certain contact pressure.

The bottom of the interlocking plate 1 is provided with a reset tension spring connected to the housing to ensure that after the disconnecting switch is opened, the interlocking plate is reset once the grounding switch operation hole is exposed, and the grounding switch can only be operated after the disconnecting switch is opened.

The interlocking plate rotates around the fulcrum pin to block the switch operating hole for interlocking.

The interlocking pin is fixed in the operation panel through a bent plate, and one end of the interlocking pin is provided with a compression spring connected to the shell, which is reset under the action of the compression spring, so that the box door can only be opened after the grounding switch is closed. Repair.

When the isolating switch is in the closed state, the interlocking cam of the isolating switch pushes the interlocking plate to rotate, and the interlocking plate blocks the operation hole of the grounding switch to prevent the grounding switch from being energized; when the isolating switch is in the open state, the interlocking plate Once the reset tension spring is reset, the grounding switch operation hole is exposed.

When the grounding switch is in the closed state, the grounding interlocking cam pushes the second interlocking plate to move upward, and the second interlocking plate blocks the operating hole of the disconnecting switch to prevent the disconnecting switch from being closed in the grounding state, and the interlocking pin is separated from the grounding interlocking cam. Only when the compression spring is reset can the box door be opened for maintenance.

The advantages of the present invention are: novel design, ingenious structure, small number of parts and components, realizing isolation and grounding quick opening and closing, reliable engagement of the contacts of the isolating switch and the grounding switch, and a perfect machine with no damage to the operation of the isolating switch and the grounding switch. "Five-proof" interlock.

Description of drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention.

FIG. 2 is a schematic diagram of the structure in the direction A-A of FIG. 1 .

FIG. 3 is a schematic structural diagram of the operation panel in FIG. 2 .

FIG. 4 is a use state reference diagram of FIG. 1 .

FIG. 5 is a schematic diagram of the structure in the direction A-A of FIG. 4 .

FIG. 6 is another use state reference diagram of FIG. 1 .

FIG. 7 is a schematic diagram of the structure in the direction A-A of FIG. 6 .

FIG. 8 is a schematic diagram of a partial structure of FIG. 1 .

FIG. 9 is a side view of FIG. 8 .

FIG. 10 is a rear view of FIG. 8 .

FIG. 11 is a three-dimensional state view of the present invention.

FIG. 12 is a rear view of FIG. 11 .

The symbols in the figure are as follows: 1 shell, 2 isolation static knife, 3 isolation quick action compression spring, 4 operation panel, 5 isolation interlock cam, 6 isolation switch operation shaft, 7 isolation movable knife, 8 isolation movable knife contact spring, 9 Grounding interlock cam, 10 Grounding switch operating shaft, 11 Grounding moving knife, 12 Grounding moving knife contact spring, 13 Grounding quick action compression spring, 14 Return tension spring, 15 Interlock plate one, 16 Pivot pin, 17 Interlock Plate 2, 18 isolation switch operating lever, 19 grounding static knife, 20 insulator, 21 interlocking pin, 22 bent plate, 23 compression spring, 24 guide screw, isolation switch operating hole 25, grounding switch operating hole 26.

Detailed ways

Example

The isolation and grounding switches of this embodiment are shown in Figures 1-7 and 11-12, and the interlocking details are shown in Figures 8-10. A new type of isolation and grounding switch for cable branch box, comprising a casing 1, an operation panel 4 is arranged on one side of the casing 1, and the casing 1 located on the back of the operation panel 4 is sequentially provided with parallel isolations from top to bottom. Static knife 2, isolating switch operating shaft 6, grounding static knife 19 and grounding switch operating shaft 10, one end of isolating switch operating shaft 6 and grounding switch operating shaft 10 passing through housing 1 are respectively provided with isolating interlocking cam 5 and grounding coupling. The locking cam 9, the isolation switch operating shaft 6 and the grounding switch operating shaft 10 are provided with an interlocking plate 1 15 and an interlocking plate 2 17, and the interlocking plate 2 17 is located between the isolation interlocking cam 5 and the grounding interlocking cam 9 , the first interlocking plate 15 is fixed on the back of the operation panel 4 by the fulcrum pin 16, the second interlocking plate 17 is located between the isolation interlocking cam 5 and the grounding interlocking cam 9, and the second interlocking plate 17 is located in the interlocking plate one 15. The front side is fixed on the back of the operation panel 4 by the guide screws 24. The operation panel 4 is provided with an interlocking pin 21 through the bent plate 22. One end of the interlocking pin 21 is close to the grounding interlocking cam 9. The operating lever 18 is linked with the isolation moving knife 7, the grounding switch operating shaft 10 is connected to the grounding moving knife 11, and the operating panel 4 is respectively provided with isolating switch operating holes 25 and grounding switches corresponding to the isolating switch operating shaft 6 and the grounding switch operating shaft 10. Operation hole 26. One end of the isolating switch operating shaft 6 close to the housing 1 is provided with an isolating quick-action compression spring 3, one end of the isolating quick-acting pressing spring 3 is connected to the isolating switch operating shaft 6, and the other end is connected to the inside of the housing 1, and the grounding switch operating shaft 10 passes through. The other end of the casing 1 is provided with a grounding quick-action compression spring 13, one end of the grounding quick-action compression spring 13 is connected to the grounding switch operating shaft 10, and the other end is connected to the outside of the casing 1 to realize quick closing and opening. The isolation movable knife 7 is provided with an isolation movable knife contact spring 8, and the grounded movable knife 11 is provided with a grounding switch contact spring 12 to ensure a certain contact pressure. The bottom of the interlocking plate 1 15 is provided with a reset tension spring 14 connected to the housing 1 to ensure that after the isolation switch is opened, the interlocking plate 1 15 is reset to expose the grounding switch operating hole 26, so that the grounding switch can be opened after the isolation switch is opened. to operate. The interlocking pin 21 is fixed on the operation panel 4 through the bent plate 22, and the interlocking pin is provided with a compression spring 23, which is reset under the action of the compression spring, so that the box door can be opened for maintenance after the grounding switch is closed. The isolation static blade 2 and the grounding static blade 19 are respectively fixed on the casing 1 through the insulator 20 to ensure the insulation distance between the high-voltage charged body and the casing (ground).

Power transmission operation:

The initial state of the product: the isolating switch is open and the grounding switch is closed, see Figure 6-7. The grounding switch operating shaft 10 is operated counterclockwise by the handle, and the grounding movable knife 11 moves counterclockwise. Under the action of the grounding quick action pressure spring 13, the grounding switch is rapidly opened; at the same time, the grounding interlock cam sleeved on the grounding switch operating shaft 10 9 is also rotated counterclockwise, so that the interlocking plate 2 17 moves downward, exposing the isolation switch operating hole. At this time, the product status: the isolation switch is open, the grounding switch is open, see Figure 1-3; operate the isolation switch clockwise through the handle The switch operates the shaft 6, and the isolation movable knife 7 moves clockwise. Under the action of the isolation quick action compression spring 4, the isolation switch is quickly closed, and the isolation movable knife compression spring 8 ensures the reliable engagement of the isolation movable knife 7 and the isolation static knife 2; at the same time, The isolating interlocking cam 5 sleeved on the isolating switch operating shaft 6 also rotates clockwise, and pushes the interlocking plate 1 15 to rotate clockwise around the coupling fulcrum 16, thereby blocking the grounding switch operating hole and preventing the live grounding switch from being connected. At this time, the product status: the isolation switch is closed, the grounding switch is open, see Figure 4-5.

Power outage operation:

The initial state of the product: the isolating switch is closed and the grounding switch is open, see Figure 4-5. The operating hole of the grounding switch is blocked by the interlocking plate 2 17, only the isolation switch is first separated, and the operating shaft 6 of the isolation switch is operated counterclockwise by the handle, and the isolation movable knife 7 moves counterclockwise. Quickly open the brake; at the same time, the isolation interlocking cam 5 sleeved on the isolation switch operating shaft 6 also rotates counterclockwise, and the interlocking plate 1 15 rotates counterclockwise around the fulcrum pin 16 under the action of the reset tension spring 14, exposing the grounding switch operating hole , the product status at this time: disconnector switch off, ground switch switch off, see Figure 1-3; operate the ground switch operating shaft 10 clockwise through the handle, the grounding moving knife 11 moves clockwise, and the grounding quick action compression spring 13 acts The grounding switch is quickly closed, and the grounding moving knife pressure spring 12 ensures the reliable engagement of the grounding moving knife 11 and the grounding static knife 19; at the same time, the grounding interlocking cam 9 sleeved on the grounding switch operating shaft 10 also rotates clockwise to make the connection The second locking plate 17 moves upward along the guide screw 24 to block the operating hole of the isolation switch to prevent the grounding switch from closing the isolation switch when the grounding switch is closed. The interlocking pin 21 slides to the right under the action of the compression spring 23, which can realize the opening of the box door for maintenance after the grounding switch is closed. At this time, the product status: the isolating switch is open and the grounding switch is closed, see Figure 6-7.

In addition to the above-mentioned implementations, the present invention may also have other implementations. All technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims (7)

1. The utility model provides a novel isolation, earthing switch for cable branch case, includes the casing, its characterized in that: an operation panel is arranged on one side of the shell, an isolation static knife, an isolation switch operation shaft, a grounding static knife and a grounding switch operation shaft which are parallel to each other are sequentially arranged in the shell positioned on the back of the operation panel from top to bottom, one end of the isolating switch operating shaft and one end of the grounding switch operating shaft which penetrate through the shell are provided with an isolating interlocking cam and a grounding interlocking cam, an interlocking plate I and an interlocking plate II are arranged between the disconnecting switch operating shaft and the grounding switch operating shaft, the first interlocking plate is fixed on the back of the operation panel by a fulcrum pin, the second interlocking plate is fixed on the back of the operation panel by a guide screw, the bottom of the operating panel is provided with an interlocking pin through a bent plate, the isolating switch operating shaft is linked with the isolating movable knife through a pull rod, the grounding switch operating shaft is connected with the grounding moving blade, and the operating panel is provided with a disconnecting switch operating hole and a grounding switch operating hole which correspond to the positions of the disconnecting switch operating shaft and the grounding switch operating shaft;

when the isolating switch is in a closing state, the isolating switch lock cam pushes the interlocking plate I to rotate, and the interlocking plate I blocks the grounding switch operation hole; when the isolating switch is in a switching-off state, the interlocking plate is reset through the reset tension spring, and the grounding switch operation hole is exposed;

when the grounding switch is in a closing state, the grounding interlocking cam pushes the interlocking plate II to move upwards, the interlocking plate II blocks the isolating switch operating hole, the interlocking pin is separated from the grounding interlocking cam, the interlocking pin is reset through the pressure spring, and the box body door is opened.

2. The novel isolating and grounding switch for a cable branch box according to claim 1, wherein: the interlocking plate II is positioned between the isolating interlocking cam and the grounding interlocking cam, the interlocking plate II is positioned on the front side of the interlocking plate I, and one end of the interlocking pin is close to the grounding interlocking cam.

3. The novel isolating and grounding switch for a cable branch box according to claim 1, wherein: an isolation quick-action pressure spring is arranged at one end, close to the shell, of the isolation switch operating shaft, one end of the isolation quick-action pressure spring is connected with the isolation switch operating shaft, and the other end of the isolation quick-action pressure spring is connected with the inner side of the shell; the other end of the grounding switch operating shaft penetrating through the shell is provided with a grounding quick-acting pressure spring, one end of the grounding quick-acting pressure spring is connected with the grounding switch operating shaft, and the other end of the grounding quick-acting pressure spring is connected with the outer side of the shell.

4. The novel isolating and grounding switch for a cable branch box according to claim 1, wherein: contact springs are arranged on the isolation moving knife and the grounding moving knife.

5. The novel isolating and grounding switch for a cable branch box according to claim 1, wherein: and a reset tension spring connected with the shell is arranged at the bottom of the first interlocking plate.

6. The novel isolating and grounding switch for a cable branch box according to claim 1, wherein: the interlocking pin is fixed in the operation panel through the bent plate, and one end of the interlocking pin is provided with a pressure spring connected with the shell.

7. The novel isolating and grounding switch for a cable branch box according to claim 1, wherein: and the interlocking plate rotates around the fulcrum pin until the switch operation hole is blocked for interlocking.

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