CN214255013U

CN214255013U - Loaded grounding device

Info

Publication number: CN214255013U
Application number: CN202120587780.XU
Authority: CN
Inventors: 岳金; 王金龙; 吴雄彪; 谢丰茜; 吴飞
Original assignee: WUHAN CHANGHAI ELECTRICAL TECHNOLOGY DEVELOPMENT CO LTD
Current assignee: WUHAN CHANGHAI ELECTRICAL TECHNOLOGY DEVELOPMENT CO LTD
Priority date: 2021-03-23
Filing date: 2021-03-23
Publication date: 2021-09-21
Anticipated expiration: 2031-03-23

Abstract

A load grounding device comprises a supporting plate, and a moving contact, a fixed contact, an arc contact and a load discharging resistor which are arranged on the supporting plate; the moving contact is rotatably arranged on the supporting plate through a rotating shaft and is electrically connected with a circuit element to be unloaded; the fixed contact is fixedly arranged on the supporting plate, the fixed contact is grounded, and one end of the fixed contact is positioned on the moving path of the moving contact; a contact block is arranged at the rotating end of the moving contact and is electrically connected with the moving contact; one end of the arc contact is positioned on the motion path of the contact block, and the arc contact is positioned at the front end of the static contact, so that the contact block is firstly contacted with the arc contact and the movable contact is then contacted with the static contact in the working process of the loaded grounding device; two ends of the lead of the load-relief resistor are respectively and electrically connected with the arc contact and the fixed contact. The utility model discloses can guarantee the not damaged contact of moving contact and ground connection static contact, guarantee return circuit equipment, personnel's safety, realize fail safe nature ground connection to guarantee not to be repelled under the short circuit operating mode.

Description

Loaded grounding device

Technical Field

The utility model belongs to the technical field of switchgear and specifically relates to a load earthing device is related to.

Background

At present, in a loaded grounding device such as a grounding isolation switch, if a load is not cut off completely and residual current exists, an arc discharge phenomenon is generated when the grounding switch is operated. Particularly for the field of rail trains, a subway train section or a parking lot needs to adopt a grounding isolating switch to ground a train power supply loop during the maintenance of the subway train; if an arc discharge phenomenon is generated when the grounding isolating switch is operated, the contact is easy to be ablated, and potential safety hazards are generated to the personal safety of electric devices and operators in the vehicle.

There is therefore a need for a loaded grounding device that overcomes the above problems.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems in the prior art, the present invention provides a loaded grounding device, which comprises a supporting plate, and a moving contact, a static contact, an arc contact and a load-relieving resistor mounted on the supporting plate;

the moving contact is rotatably arranged on the supporting plate through a rotating shaft and is electrically connected with a circuit element to be unloaded;

the fixed contact is fixedly arranged on the supporting plate, the fixed contact is grounded, and one end of the fixed contact is positioned on the motion path of the moving contact;

a contact block is arranged at the rotating end of the moving contact and is electrically connected with the moving contact;

one end of the arc contact is positioned on a motion path of the contact block, and the arc contact is positioned at the front end of the fixed contact, so that the contact block is firstly contacted with the arc contact and the movable contact is then contacted with the fixed contact in the working process of the loaded grounding device;

and two ends of a lead of the load relief resistor are electrically connected with the arc contact and the fixed contact respectively.

In some embodiments, the arcing contact comprises a roller, a roller axle, a mounting head, a rod, a spring, and a guide block;

the roller is rotatably arranged on the mounting head through a roller wheel shaft, and the roller is positioned on the motion path of the contact block, so that the contact block can be in direct contact with the roller in motion;

a through hole which is adaptive to the size of the rod body is formed in the guide block, and the rod body penetrates through the guide block;

the mounting head is arranged at the head end of the rod body, and the tail end of the rod body extends out of the guide block;

the spring is sleeved on the rod body, and two ends of the spring are limited by the mounting head and the guide block respectively.

In some embodiments, the arcing contact further comprises a lock nut and an insulating support block;

the insulation supporting block is fixedly arranged on the supporting plate or the static contact, and the guide block is fixed on the insulation supporting block;

the surface of the tail end of the rod body is provided with threads, and the locking nut is fixed at the tail end of the rod body through threaded connection.

In some embodiments, the movable contact comprises a contact plate, a spring plate and a clamping plate;

the contact plate is used for being in direct contact with the fixed contact;

the spring piece is arranged between the contact plate and the clamping plate;

the clamping plate extrudes the spring sheet and the contact plate through the limiting device, so that a certain contact pressure is provided for the contact between the contact plate and the static contact.

In some embodiments, a plurality of contacts are uniformly distributed at the outer end of the contact plate, and adjacent contacts are separated by a groove.

In some embodiments, the contact surface of the contact block for contacting the arcing contact is arc-shaped, and the rear end surface of the contact surface is tapered.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model provides an area load earthing device, when the moving contact prepares ground connection, the contact piece of installation is preferred to contact with the arc contact on the moving contact, and continue at the uniform velocity ground connection, this in-process, the electric load in the system realizes safe orderly controllable releasing of electric load through arc contact and discharge resistance, treat to release and finish the back, the arc contact is kept away from with the contact piece, the moving contact is with the static contact and realize reliable ground connection, thereby can guarantee the not damaged contact of moving contact and ground connection static contact, guarantee return circuit equipment, personnel's safety, the fail safe nature ground connection has been realized, and guarantee not repulsed under the short circuit operating mode.

Drawings

Fig. 1 is a schematic view of a loaded grounding device provided by the present invention;

FIG. 2 is an enlarged schematic view of a portion of the structure of FIG. 1;

fig. 3 is an enlarged schematic view of a part of the structure in fig. 1.

Detailed Description

In order to make the technical means, the creation features, the achievement purposes and the functions of the present invention easy to understand and understand, how to implement the present invention is further explained below with reference to the accompanying drawings and the detailed description.

Referring to fig. 1-3, the present invention provides a loaded grounding device, which comprises a supporting plate 10, a moving contact 1, a static contact 2, an arc contact 3 and a load-relieving resistor 5, wherein the moving contact 1, the static contact 2, the arc contact 3 and the load-relieving resistor 5 are mounted on the supporting plate 10; the moving contact 1 is rotatably arranged on the supporting plate 10 through a rotating shaft, and the moving contact 1 is electrically connected with a circuit element to be unloaded; the static contact 2 is fixedly arranged on the support plate 10, the static contact 2 is grounded, and one end of the static contact 2 is positioned on the moving path of the moving contact 1; a contact block 4 is arranged at the rotating end of the moving contact 1, and the contact block 4 is electrically connected with the moving contact 1; one end of the arc contact 3 is positioned on the motion path of the contact block 4, and the arc contact 3 is positioned at the front end of the static contact 2, so that the contact block 4 is firstly contacted with the arc contact 3, and the movable contact 1 is then contacted with the static contact 2 in the working process of the loaded grounding device; two ends of a lead of the load-discharging resistor 5 are respectively and electrically connected with the arc contact 3 and the static contact 2.

Preferably, the arcing contact 3 comprises a roller 31, a roller axle 32, a mounting head 33, a rod 38, a spring 34 and a guide block 36; the roller 31 is rotatably mounted on the mounting head 33 through a roller axle 32, and the roller 31 is positioned on the motion path of the contact block 4, so that the contact block 4 can be directly contacted with the roller 31 during motion; a through hole which is adaptive to the size of the rod body 38 is formed in the guide block 36, and the rod body 38 penetrates through the guide block 36; the mounting head 33 is arranged at the head end of the rod body 38, and the tail end of the rod body 38 extends out of the guide block 36; the spring 34 is sleeved on the rod 38, and two ends of the spring 34 are limited by the mounting head 33 and the guide block 36 respectively.

Preferably, the arcing contact 3 further comprises a lock nut 37 and an insulating support block 35; the insulation supporting block 35 is fixedly arranged on the supporting plate 10 or the static contact 2, and the guide block 36 is fixed on the insulation supporting block 35; the surface of the tail end of the rod body 38 is provided with threads, and the lock nut 37 is fixed to the tail end of the rod body 38 through threaded connection.

It is understood that the roller axle 32 may be a pin; the mounting head 33 and the rod body 38 may be integrally formed by a Y-shaped push rod; the lock nut 37 is used to adjust the stroke of the rod 38 and also serves as a lead terminal for connecting the load-relief resistor 5. The contact overtravel of the arc contact 3 can be realized by adjusting the stroke distance of the rod body 38 through the locking position of the locking nut 37, and the position of the locking nut 37 can also be adjusted to realize the continuous use of the arc contact 3 when the loaded grounding device is maintained, so that the service life of the grounding arc contact 3 and the service life of the loaded grounding device are prolonged. In the working process of the grounding device with load, the spring 34 works in a short time, so that the service life of the spring 34 can be effectively prolonged, and further the service life of the arc contact 3 and the service life of the grounding device with load are prolonged.

Preferably, the moving contact 1 comprises a contact plate 13, a spring plate 12 and a clamping plate 11 which are symmetrically arranged; the contact plate 13 is used for directly contacting with the static contact 2; the spring piece 12 is arranged between the contact plate 13 and the clamping plate 11; the clamping plate 11 extrudes the spring sheet 12 and the contact plate 13 through the limiting device, so that a certain contact pressure is provided for the contact between the contact plate 13 and the static contact 2, the contact can be stably and reliably ensured not to be repelled or burnt under the working condition of fault short circuit, and the safety of equipment and personnel is ensured.

Preferably, a plurality of contacts 131 are uniformly distributed at the outer end of the contact plate 13, and adjacent contacts 131 are separated by a groove. Through the arrangement, the current can be uniformly distributed, the effects of flow guiding and flow equalizing are achieved, and the virtual connection phenomenon caused by rigid contact of points can be avoided.

Preferably, the contact surface of the contact block 4 for contacting the arcing contact 3 is arc-shaped, and the rear end surface of the contact surface is tapered. Through such setting, can reduce the collision impact of gyro wheel 31 and contact piece 4 to realize the relative uniform motion between the two when the two contact, and after the contact finishes, quick separation.

Preferably, the contact block 4 is made of a material resistant to arc erosion to ensure long-term use. The load release resistor 5 can select a proper resistance value and heating power through the loop load to ensure that the electric load in the system is released completely before the moving contact 1 contacts the static contact 2; the load-discharging resistor 5 is directly fixed on the supporting plate 1, so that the heat dissipation of the load-discharging resistor 5 is facilitated, and a corresponding heat dissipation structure, such as a heat dissipation fan, can be additionally arranged for the load-discharging resistor 5.

The working process of the utility model is as follows: when the moving contact is ready to be grounded, a contact block arranged on the moving contact is preferentially contacted with an arc contact, specifically, an arc contact surface of the contact block is contacted with a roller of the arc contact, and meanwhile, the contact block extrudes the arc contact to compress a spring of the arc contact; after the discharge is finished, the arc contact is far away from the contact block, the arc contact is restored to the original state under the action of the elastic force of the spring, the moving contact is contacted with the fixed contact, and stable and reliable contact is realized under the action of structures such as a clamping plate, a spring piece and a contact plate of the moving contact.

To sum up, the utility model provides a load earthing device through arc contact, discharge resistance isotructure, has realized the not damaged contact of moving contact, static contact, has realized releasing at the uniform velocity of residual charge, avoids energy storage device such as electric capacity to release fast and causes the device to damage to loop equipment, personnel's safety has been guaranteed, has realized fail safe nature ground connection, and guarantees not being repelled under the short circuit operating mode.

Finally, it is noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.

Claims

1. A loaded grounding device is characterized by comprising a support plate (10), and a moving contact (1), a static contact (2), an arc contact (3) and a load-shedding resistor (5) which are arranged on the support plate (10);

the moving contact (1) is rotatably arranged on the supporting plate (10) through a rotating shaft, and the moving contact (1) is electrically connected with a circuit element to be unloaded;

the static contact (2) is fixedly arranged on the supporting plate (10), the static contact (2) is grounded, and one end of the static contact (2) is positioned on the motion path of the moving contact (1);

a contact block (4) is arranged at the rotating end of the moving contact (1), and the contact block (4) is electrically connected with the moving contact (1);

one end of the arc contact (3) is positioned on a motion path of the contact block (4), and the arc contact (3) is positioned at the front end of the static contact (2), so that the contact block (4) is firstly contacted with the arc contact (3) and the movable contact (1) is then contacted with the static contact (2) in the working process of the loaded grounding device;

and two ends of a lead of the load discharging resistor (5) are respectively and electrically connected with the arc contact (3) and the static contact (2).

2. The loaded grounding device according to claim 1, wherein the arcing contact (3) comprises a roller (31), a roller axle (32), a mounting head (33), a rod (38), a spring (34) and a guide block (36);

the roller (31) is rotatably mounted on a mounting head (33) through a roller axle (32), and the roller (31) is positioned on the motion path of the contact block (4), so that the contact block (4) can be directly contacted with the roller (31) in motion;

a through hole which is adaptive to the size of the rod body (38) is formed in the guide block (36), and the rod body (38) penetrates through the guide block (36);

the mounting head (33) is arranged at the head end of the rod body (38), and the tail end of the rod body (38) extends out of the guide block (36);

the spring (34) is sleeved on the rod body (38), and two ends of the spring (34) are limited by the mounting head (33) and the guide block (36) respectively.

3. The loaded grounding device according to claim 2, wherein the arcing contact (3) further comprises a lock nut (37) and an insulating support block (35);

the insulation supporting block (35) is fixedly arranged on the supporting plate (10) or the static contact (2), and the guide block (36) is fixed on the insulation supporting block (35);

the surface of the tail end of the rod body (38) is provided with threads, and the locking nut (37) is fixed at the tail end of the rod body (38) through threaded connection.

4. The loaded grounding device of claim 1, wherein the movable contact (1) comprises a contact plate (13), a spring plate (12) and a clamping plate (11);

the contact plate (13) is used for being in direct contact with the static contact (2);

the spring piece (12) is arranged between the contact plate (13) and the clamping plate (11);

the clamping plate (11) extrudes the spring sheet (12) and the contact plate (13) through the limiting device, so that a certain contact pressure is provided for the contact between the contact plate (13) and the static contact (2).

5. A loaded grounding device according to claim 4, characterized in that a number of contacts (131) are evenly distributed at the outer end of the contact plate (13), and adjacent contacts (131) are separated by a groove.

6. A loaded grounding device according to claim 1, characterized in that the contact surface of the contact block (4) for contacting the arcing contact (3) is arc-shaped, the rear end surface of the contact surface being conical.