CN108648948B

CN108648948B - Heavy current grounding device

Info

Publication number: CN108648948B
Application number: CN201810809598.7A
Authority: CN
Inventors: 董桂华; 毕永强; 彭琰举
Original assignee: Xian Aeronautical University
Current assignee: Xian Aeronautical University
Priority date: 2018-07-23
Filing date: 2018-07-23
Publication date: 2023-05-16
Anticipated expiration: 2038-07-23
Also published as: CN108648948A

Abstract

The invention relates to the technical field of high-voltage electric appliance grounding switches, in particular to a high-current grounding device. The high-current grounding device solves the problem that the current capacity of the conventional grounding switch is inconsistent with the installation space, and comprises a base, a static side base, a transmission mechanism, a grounding knife, a contact finger seat and a contact finger; the transmission mechanism is arranged in the base, the transmission mechanism drives the ground knife to move up and down and rotate, the bottom end of the ground knife is connected with the base through soft connection, the contact finger seat is fixed on the static side base, the contact finger is arranged in the contact finger seat, the contact finger seat corresponds to the other end of the ground knife, and when the ground knife moves to the highest position, the contact finger seat is contacted with the contact finger in the contact finger seat.

Description

Heavy current grounding device

Technical Field

The invention relates to the technical field of high-voltage electrical appliance grounding switches, in particular to a high-current grounding device.

Background

The high voltage electrical equipment grounding switch is a mechanical switch for a circuit grounding part, which is required to bear current under abnormal conditions in a certain time and also required to bear certain insulation voltage. The existing grounding switch comprises a disconnecting link type grounding switch and a direct-acting plug-in type grounding switch, wherein the disconnecting link type grounding switch is small in installation requirement space, weak in through-current capacity and large in installation space requirement, and the direct-acting plug-in type grounding switch can bear large current.

Disclosure of Invention

In order to solve the problem that the current capacity of the grounding switch is inconsistent with the installation space in the prior art, the invention provides a high-current grounding device which adopts a composite motion structure to enable a grounding knife to vertically move and rotate, so that the grounding switch of a high-voltage electrical apparatus is ensured to have larger current capacity while the installation requirement space is reduced.

The technical scheme for solving the problems is that the high-current grounding device comprises a base and a static side base and is characterized in that: the device also comprises a transmission mechanism, a ground knife, a touch finger seat and a touch finger; the transmission mechanism is arranged in the base, the transmission mechanism drives the ground knife to move up and down and rotate, the bottom end of the ground knife is connected with the base through flexible connection, the contact finger seat is fixed on the static side base, the contact finger is arranged in the contact finger seat, the contact finger seat corresponds to the other end of the ground knife, and when the ground knife moves to the highest position, the contact finger seat is contacted with the contact finger in the contact finger seat.

The above is a basic structure of the present invention, based on which the present invention also makes the following optimization improvements:

further, the transmission mechanism comprises a guide rail, a driving shaft, a crank arm and a driven shaft, wherein the guide rail comprises a sector plate, and a curve groove is formed in the sector plate; a through hole is radially formed in one end, close to the base, of the ground knife, the through hole penetrates through the pin shaft, and a strip hole is further formed in the middle of the ground knife; the driving shaft and the driven shaft are arranged on the base; the driven shaft is wrapped with an insulating layer, or the insulating layer is arranged in the strip hole of the ground knife; the pin shaft is wrapped with an insulating layer, or the insulating layer is arranged on the inner wall of the through hole of the ground knife; one end of the crank arm is fixed with one end of the driving shaft, the guide rail is fixed on the driving shaft, the pin shaft penetrates through the curved grooves of the two sector plates, the driven shaft is positioned above the driving shaft, and the driven shaft penetrates through the strip-shaped hole on the ground knife.

Further, the curved groove on the guide rail is composed of two sections of arc grooves with different radians, and the two sections of arc grooves with different radians are a first arc groove and a second arc groove. The two arc-shaped grooves with different radians are designed, so that when the brake is separated, the ground knife moves downwards firstly and rotates around the driven shaft after a certain distance is reached; during closing operation, the ground knife rotates around the driven shaft, and moves upwards to contact with the contact finger in the contact finger seat after rotating to a position corresponding to the static side, so that closing operation is completed.

Further, a positioning structure is arranged on the static side base and is used for being matched with the upper end of the ground knife.

Further, the ground knife is a hollow cylinder, and the positioning structure comprises a cylindrical bulge which can penetrate into the hollow cylinder to be matched.

Further, the end of the columnar boss is provided with a chamfer.

Further, the number of the sector plates is two.

Further, the base is a box body with a top uncovered.

Further, the flexible connection is a flexible conductor.

The invention has the advantages that:

1. according to the high-current grounding device, the curved groove of the guide rail consists of two sections of arc grooves with different radians, and the grounding knife is matched with the two sections of arc grooves with different radians to compound linear motion and rotary motion; the first arc-shaped groove is matched with the ground knife, the ground knife is contacted and separated through linear motion and the contact finger, and the guide rail provides an upward acting force for the ground knife, so that a larger through-flow capacity is ensured; the second arc-shaped groove is matched with the ground knife, and the ground knife rotates by taking the driven shaft as the center, so that the volume and the occupied space are reduced;

2. according to the high-current grounding device, the positioning structure is arranged in the static side base, the hollow cylindrical grounding knife is matched with the positioning structure in the static side base, and reliable contact can be realized during closing.

Drawings

FIG. 1 is a block diagram of a high current grounding device of the present invention when it is in a closed state;

FIG. 2 is an enlarged view of FIG. 1 at A;

FIG. 3 is a view of the base structure of FIG. 1;

FIG. 4 is a block diagram of the guide rail of FIG. 1;

FIG. 5 is a block diagram of the earth-boring cutter of FIG. 1;

FIG. 6 is a diagram of the finger structure of FIG. 1;

FIG. 7 is a view of the finger pad of FIG. 1;

FIG. 8 is a view showing the construction of the static base in FIG. 1;

FIG. 9 is a diagram showing the state of the switch-off of the high current grounding device according to the present invention.

Wherein, 1-base; 2-a static side base; 3-a ground knife; 4-contact finger seats; 5-contact fingers; 6-soft connection; 7, a guide rail; 8-a driving shaft; 9-turning arms; 10-a driven shaft; 11-pin shafts; 12-a spring; 13. a positioning structure; 14. a first arc-shaped groove; 15. a second arcuate slot.

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

The embodiment of the invention provides a high-current grounding device, which is shown in fig. 1-8, and comprises a base 1, a static base 2, a transmission mechanism, a grounding knife 3, a contact finger seat 4 and a contact finger 5.

The base 1 is a box body with a top without a cover; the ground knife 3 is a hollow cylinder, so that the strength is ensured, the weight is reduced, and the convenience in operation is facilitated. The static side base 2 is provided with a positioning structure 13 which comprises a cylindrical bulge, and the cylindrical bulge can penetrate into the hollow cylinder to be matched. The inner circular surface of the ground knife 3 is contacted with the outer circular surface of the positioning structure, and the ground knife 3 is contacted with the contact finger stably by matching with the upward force exerted by the guide rail. The end part of the columnar bulge is provided with a chamfer, so that the functions of guiding and avoiding scratch are achieved.

Of course, the ground knife 3 may be designed into a rectangular strip shape or other shapes, and the protrusion of the positioning mechanism 13 may also be changed according to the shape of the ground knife 3.

The transmission mechanism comprises a guide rail 7, a driving shaft 8, a crank arm 9 and a driven shaft 10, wherein the guide rail 7 comprises two sector plates with the same size, curved grooves are formed in the sector plates and consist of two sections of arc grooves with different radians, and the two sections of arc grooves with different radians are a first arc groove 14 and a second arc groove 15.

A through hole is radially formed in one end, close to the base 1, of the ground knife 3, a pin shaft 11 penetrates into the through hole, and a strip hole is further formed in the middle of the ground knife 3; the driving shaft 8 and the driven shaft 10 are both arranged on the base 1, the insulating layer is wrapped on the driven shaft 10, or the insulating layer is arranged in the strip hole of the ground knife 3; the pin shaft 11 is wrapped with an insulating layer, or the inner wall of the through hole of the ground knife 3 is provided with the insulating layer. One end of the crank arm 9 is fixed with one end of the driving shaft 8, the guide rail 7 is fixed on the driving shaft 8, the pin shaft 11 passes through the curved grooves of the two sector plates, the driven shaft 10 is positioned above the driving shaft 8, and the driven shaft 10 passes through the strip-shaped hole on the ground knife 3. The strip-shaped holes are matched with the pin shafts 11 to play a role in guiding.

The bottom end of the ground knife 3 is connected with the base 1 through a flexible connection 6, the contact finger seats 4 are fixed on the static side base 2, the number of the contact fingers 5 is multiple, the contact fingers 5 are arranged in the contact finger seats 4, and a spring 12 is arranged between each contact finger 5 and the inner wall of the contact finger seat 4. The contact finger seat 4 corresponds to the other end of the ground knife 3. The flexible connection 6 is a flexible conductor, and the flexible conductor comprises a plurality of layers of copper sheets, and two ends of the plurality of layers of copper sheets are compacted. The static base 2 is mounted on a circuit breaker or a disconnecting switch, and the base 1 is grounded.

The working principle of the invention is as follows:

taking the state of the guide rail 7 in fig. 1 as an initial state, driving the driving shaft 8 to rotate clockwise through the crank arm 9, and rotating the guide rail 7 fixed on the driving shaft 8 along with the driving shaft, wherein the pin shaft 11 moves in a first arc-shaped groove 14 in the guide rail 7, the ground knife 3 moves downwards in a straight line, the upper end of the ground knife 3 is separated from the contact finger 5, after the ground knife is separated to a certain position (the upper part of a strip hole is contacted with the driven shaft 10 and the ground knife cannot move downwards), the pin shaft 11 moves in a second arc-shaped groove 15 in the guide rail 7, and the ground knife 3 starts to rotate around the driven shaft 10 until the pin shaft 11 contacts with the tail end of the second arc-shaped groove 15 until a certain position is reached, so that the brake separating operation is realized (see fig. 9); the driving shaft 8 is driven to rotate through the crank arm 9, the guide rail 7 fixed on the driving shaft 8 rotates along with the driving shaft, the pin shaft 11 moves in the second arc-shaped groove 15 in the guide rail 7, the ground knife 3 rotates around the driven shaft 10 to a position corresponding to the static side base 2, then the crank arm 9 drives the driving shaft 8 and the guide rail 7 to continue to rotate, the lower part of the strip hole is contacted with the driven shaft 10, the pin shaft 11 moves in the first arc-shaped groove 14 in the guide rail 7 to drive the ground knife 3 to move upwards in a straight line until the upper end of the ground knife 3 is reliably contacted with the contact finger 5 and the positioning structure in the static side base 2, and closing operation is realized.

The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. The utility model provides a heavy current earthing device, includes base (1) and quiet side base (2), its characterized in that: the device also comprises a transmission mechanism, a ground knife (3), a contact finger seat (4) and a contact finger (5);

the transmission mechanism is arranged in the base (1), the transmission mechanism drives the ground knife (3) to move up and down and rotate, the bottom end of the ground knife (3) is connected with the base (1) through a flexible connection (6), the contact finger seat (4) is fixed on the static side base (2), the contact finger (5) is arranged in the contact finger seat (4), a spring (12) is arranged between the contact finger (5) and the inner wall of the contact finger seat (4), the contact finger seat (4) corresponds to the other end of the ground knife (3), and when the ground knife (3) moves to the highest position, the contact finger contacts with the contact finger (5) in the contact finger seat (4);

the transmission mechanism comprises a guide rail (7), a driving shaft (8), a crank arm (9) and a driven shaft (10), wherein the guide rail (7) comprises a sector plate, and a curve groove is formed in the sector plate; a through hole is radially formed in one end, close to the base (1), of the ground knife (3), a pin shaft (11) penetrates into the through hole, and a strip hole is further formed in the middle of the ground knife (3);

the driving shaft (8) and the driven shaft (10) are both arranged on the base (1); the driven shaft (10) is wrapped with an insulating layer, or the insulating layer is arranged in a strip hole of the ground knife (3); an insulating layer is wrapped on the pin shaft (11), or the inner wall of a through hole of the ground knife (3) is provided with the insulating layer;

one end of the crank arm (9) is fixed with one end of the driving shaft (8), the guide rail (7) is fixed on the driving shaft (8), the pin shaft (11) passes through the curved slot of the sector plate, the driven shaft (10) is positioned above the driving shaft (8), and the driven shaft (10) passes through the strip-shaped hole on the ground knife (3);

the curved groove on the guide rail (7) consists of two sections of arc grooves with different radians, and the two sections of arc grooves with different radians are a first arc groove (14) and a second arc groove (15).

2. The high current grounding device of claim 1, wherein: the static side base (2) is provided with a positioning structure (13), and the positioning structure (13) is used for being matched with the upper end of the ground knife (3).

3. The high current grounding device of claim 2, wherein: the ground knife (3) is a hollow cylinder, the positioning structure comprises a cylindrical bulge, and the cylindrical bulge can penetrate into the hollow cylinder to be matched.

4. A high current grounding device according to claim 3, wherein: the end of the columnar bulge is provided with a chamfer.

5. The high current grounding apparatus of claim 4, wherein: the number of the sector plates is two.

6. The high current grounding apparatus of claim 5, wherein: the base (1) is a box body with a top without a cover.

7. The high current grounding apparatus of claim 6, wherein: the flexible connection (6) is a flexible conductor.