KR20160039082A

KR20160039082A - Earthing switch

Info

Publication number: KR20160039082A
Application number: KR1020140132038A
Authority: KR
Inventors: 최기열
Original assignee: 현대중공업 주식회사
Priority date: 2014-09-30
Filing date: 2014-09-30
Publication date: 2016-04-08

Abstract

The present invention relates to a grounding switch capable of maintaining constant constant contact force. According to an aspect of the present invention, there is provided a ground switch including a pair of contact plates, a spacer interposed between the contact plates, a pair of pressing plates respectively coupled to the outside of the contact plates, And an elastic member for pressing the contact plate toward the spacer side via a plate.

Description

Ground switch {EARTHING SWITCH}

The present invention relates to a grounding switch capable of maintaining a constant contact force.

In general, the switchboard is divided into an air insulated switch-gear, a solid insulated switch-gear and a gas insulated switch-gear depending on the insulated medium.

The above gas insulated switchgear has a vacuum container which extinguishes arcs generated at the time of opening and closing and disconnects the circuit in case of an accident, a shutoff mechanism device for operating the vacuum container, Phase switch (3-position switch) with a grounding switch function that can be connected to the main circuit.

In addition, sulfur hexafluoride (SF6) gas, which is used as insulating medium in gas-insulated switchgear, is a colorless, odorless, non-toxic, non-combustible gas with high stability at room temperature. It has 3.7 times higher dielectric strength than air and is the most commercially used It is an insulating medium. It is important to reduce and equalize the electric field distribution and to prevent foreign particles such as metal particles and moisture from being mixed in the design and fabrication of the actual device because the electronic state (Avalanche) .

In the case of the switchboard, a breaker for opening and breaking is provided as described above. The breaker includes a switch for opening and closing the power source, and a switch driving device for controlling the driving of the breaker is connected to the breaker to provide a driving force for opening and closing the switch.

And a grounding switch for grounding the load side in order to remove the residual current remaining in the switchboard when the switch is closed.

However, in the conventional ground switch, deformation occurs due to repetitive contact / separation operation at a portion where contact and separation are practically performed, and the contact force is lowered.

SUMMARY OF THE INVENTION It is an object of the present invention to at least partially solve the problems of the prior art described above and to provide a grounding switch capable of continuously maintaining a constant contact force.

A grounding switch according to an embodiment of the present invention includes: a pair of contact plates; A spacer interposed between the contact plates; A pair of pressing plates respectively coupled to the outside of the contact plates; And an elastic member for urging the contact plate toward the spacer via the pressing plate through an elastic force.

In this embodiment, it may further include a fastening member passing through both the pressure plates and the contact plates and fixedly coupling the pressure plates to the contact plates.

In the present embodiment, the fastening member may include bolts and nuts.

In the present embodiment, the elastic member may be interposed between the head of the bolt or the nut and the pressing plate.

In the present embodiment, the elastic member may include a coil spring coupled to the bolt, and a cover that receives the coil spring and is coupled to the bolt.

In the present embodiment, the pressing plate may include at least one protrusion protruding toward the contact plate and contacting the contact plate.

In the grounding switch according to the present invention, the pressing plate continuously presses the contact plate with a constant force by the elastic member. So that the distance between the contact plates can always be kept constant.

Further, since the contact plate is elastically pressed by the elastic member, the time required to reduce the assembly tolerance in the process of assembling the ground switch can be minimized.

In addition, even when the pressure contact contacts the stationary contact, the contact plate is constantly pressed, so that a firm contact state can be maintained.

1 is a side view schematically showing a state in which a ground switch according to an embodiment of the present invention is opened.
Fig. 2 is a side view schematically showing a state where the ground switch is closed in Fig. 1; Fig.
3 is a plan view along the direction A in Fig.
Fig. 4 is a partially exploded perspective view showing an enlarged view of a portion B in Fig. 3; Fig.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. In addition, the shape and size of elements in the figures may be exaggerated for clarity.

FIG. 1 is a side view schematically illustrating a state in which a ground switch according to an embodiment of the present invention is opened, and FIG. 2 is a side view schematically illustrating a state in which a ground switch is closed.

Fig. 3 is a plan view along the direction A in Fig. 2, and Fig. 4 is a partially exploded perspective view showing an enlarged view of a portion B in Fig.

1 to 4, the ground switch 100 according to the present embodiment may include a rotary shaft 50, a fixed contact 10, and a movable contact 20.

The rotary shaft 50 is rotatably mounted on a grounding device (not shown), and one end of the rotary shaft 50 may be connected to a grounding switch driving device (not shown) provided in the grounding device. Therefore, the rotary shaft 50 can be rotated forward / reverse by driving the earthing switch driving device.

A plurality of movable contacts 20 are fastened to the rotating shaft 50 at regular intervals. The movable contacts 20 are spaced apart from each other by a predetermined distance and are fastened to the rotary shaft 50 and rotated together with the rotation of the rotary shaft 50 to contact or separate from the stationary contact 10.

The stationary contact 10 is spaced apart from the rotary shaft 50 of the movable contact 20 by a predetermined distance and is brought into contact with or separated from the movable contact 20 in accordance with rotation of the rotary shaft 50 (forward rotation / reverse rotation).

A plurality of fixed contacts 10 according to the present embodiment may be provided and include a bonding portion 11 bonded to a metal plate, an extending portion 12 vertically protruding from the bonding portion 11, And may include an extended contact portion 13.

The contact portion 13 has a constant width. On both sides of the contact portion 13, the contact plate 22 of the movable contact 20 described later is contacted and electrically connected. Therefore, the width of the contact portion 13 can be made equal to the distance of the contact plate 22 described later.

A plurality of movable contacts 20 may be provided corresponding to the number of the fixed contacts 10. In the present embodiment, three movable contacts 20 are provided.

The movable contact 20 includes a pair of contact plates 22 and a frame 23 inserted therebetween, a spacer 24, a pressing plate 25, fastening members 40 and 42, and an elastic member 30 ).

The contact plate 22 is formed in a substantially Y shape and is formed such that the two contact plates 22 are coupled to each other toward the rotary shaft 50. The contact plates 22 are spaced apart from each other as they are further away from the rotary shaft 50 .

A frame 23 for reinforcing the rigidity can be interposed between the contact plates 22.

Spacers (24) are provided at portions which are spaced apart from each other on the contact plate (22).

The spacers 24 are provided to secure the spacing of the contact plates 22. So that the contact plate 22 maintains a constant spacing distance by means of the spacers 24. Here, the spacing distance of the contact plate 22 may be defined corresponding to the width of the stationary contact 10.

The pressing plate 25 is fastened to the outside of the portion of the contact plate 22 spaced apart by the spacer 24.

The pressing plate 25 can be fastened to the pressing plate 25 and the contact plate 22 by the fastening members 40 and 42. The fastening members 40 and 42 according to the present embodiment include bolts 40, (42) may be used.

The pressing plate 25 may be formed in a shape similar to the width of the contact plate 22 and may be formed in a pair like the contact plate 22.

Also, at least one protrusion 26 which contacts the contact plate 22 and presses the contact plate 22 may be formed on the inner surface of the pressure plate 25. [

The protrusion 26 can protrude at a position corresponding to the portion where the contact plate 22 contacts the stationary contact 10 to press the contact plate 22. [

The bolts 40 are fastened to the fastening members 40 and 42 through both the pressing plate 25 and the contact plate 22 and the nut 42 is fastened to the end of the fastening member 40 protruding outward from the pressing plate 25 .

The elastic member 30 can be interposed between the bolt head 41 and the pressing plate 25. [

The elastic member 30 may include a coil spring 31 and a cover 33.

The coil spring 31 is coupled to the bolt 40 and disposed between the bolt head 41 and the pressing plate 25 to provide an elastic force.

More specifically, both ends of the coil spring 31 press the inner surface of the bolt head 41 and the outer surface of the pressing plate 25 and provide an elastic force to be spaced from each other.

A washer 32 may be interposed between the coil spring 31 and the pressing plate 25 if necessary.

The pressing plate 25 presses the contact plate 22 on both outer surfaces of the contact plate 22 by the elastic force of the coil spring 31. [ Therefore, it is possible to prevent the contact plate 22 from bending or the gap between the contact plates 22 from spreading.

Further, since the spacers 24 are disposed between the contact plates 22, the interval between the contact plates 22 is prevented from being narrowed, so that the interval between the contact plates 22 can be always kept constant.

The cover 33 receives the coil spring 31 therein and is engaged with the bolt 40.

Thus, the cover 33 can be formed in the shape of an empty pipe, one end of which is in contact with the outer surface of the washer 32 or the pressure plate 25, and the other end of which is in contact with the inner surface of the bolt head 41.

To this end, one end of the cover 33 is opened so that the washer 32 is disposed, and the other end is formed with a hole with a diameter smaller than that of the bolt head 41.

The other end of the cover 33 is partly interposed between the coil spring 31 and the bolt head 41 so that the cover 33 is not easily detached from the bolt 40 even if the cover 33 is engaged with the bolt 40 .

In the grounding switch 100 according to this embodiment configured as described above, the pressing plate 25 constantly presses the contact plate 22 with a certain force by the elastic member 30. So that the distance between the contact plates 22 can always be kept constant.

Also, since the contact plate 22 is elastically pressed by the elastic member 30, the time required to reduce the assembly tolerance in the process of assembling the ground switch 100 can be minimized.

In addition, even when the pressing contact contacts the stationary contact 10, the contact plate 22 is constantly pressed, so that a firm contact state can be maintained.

While the present invention has been particularly shown and described with reference to particular embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention as defined by the following claims I would like to make it clear.

100: Ground switch
10: Fixed contact
20: movable contact
30: elastic member
50:

Claims

A pair of contact plates;
A spacer interposed between the contact plates;
A pair of pressing plates respectively coupled to the outside of the contact plates; And
An elastic member for pressing the contact plate toward the spacer via the pressing plate through an elastic force;
.

The method according to claim 1,
And a fastening member penetrating both the pressure plates and the contact plates and fixedly coupling the pressure plates to the contact plates.

The connector according to claim 2,
A grounding switch including bolts and nuts.

The elastic member according to claim 3,
A head of the bolt or a ground switch interposed between the nut and the pressing plate.

5. The elastic member according to claim 4,
A coil spring coupled to the bolt; And
A cover receiving the coil spring and coupled to the bolt;
.

The press machine according to claim 1,
And at least one protrusion projecting toward the contact plate side and contacting the contact plate.