WO2021093253A1

WO2021093253A1 - Direct-insertion grounding switch contact having buffering and guiding functions

Info

Publication number: WO2021093253A1
Application number: PCT/CN2020/081676
Authority: WO
Inventors: 吴上; 贺坤; 唐雪平; 吴奇钢; 张亚平
Original assignee: 湖南长高高压开关集团股份公司; 湖南长高高压开关有限公司
Priority date: 2019-11-13
Filing date: 2020-03-27
Publication date: 2021-05-20
Also published as: CN110890233A

Abstract

A direct-insertion grounding switch contact that has buffering and guiding functions, comprising: a static contact mechanism, which comprises a conductive plate (100), a guide cover (200) and a grounding contact finger (300), wherein the guide cover comprises a cylindrical part (210) and a guide channel (220), one end of the cylindrical part is fixedly connected to the conductive plate, the guide channel is transversely arranged at the other end of the cylindrical part, the guide channel is V-shaped, and the channel bottom part of the guide channel is aligned with the cylinder of the cylindrical part, and the grounding contact finger has a cylindrical shape that matches the cylindrical part and is disposed in the cylindrical part; and a movable contact mechanism, which comprises a grounding conductive rod (400) and a movable contact (500), wherein the grounding conductive rod rotates using a point on the axis as the center, the movable contact is disposed at the top end on the grounding conductive rod, the guide channel is located on the rotation path of the movable contact, and a guide opening of the guide channel faces the movable contact. The guide channel is provided to supply a guiding function for the grounding conductive rod to ensure that the grounding conductive rod is aligned with the grounding contact finger before closing, and assists the grounding conductive rod in better completing the closing action, thereby avoiding the situation in which the grounding conductive rod cannot complete the closing action due to misplacement with the grounding contact finger before closing.

Description

Direct-drive plug-in grounding switch contact with buffering and guiding functions

Technical field

The invention relates to the technical field of power equipment, in particular to a direct hitting plug-in high-voltage grounding switch contact with buffering and guiding functions.

Background technique

In the power transmission and distribution system, the high-voltage grounding switch, as an electrical device for grounding protection when overhauling equipment in high-voltage lines, is widely used in substations. The grounding switch of 550kV and below generally adopts a folding arm structure, a direct driving structure or a direct driving plug-in structure.

The advantages of the direct driving structure and the direct driving plug-in structure over the folding arm structure are that the number of parts is small, the structure is simple, the failure rate is small, and the cost is low; the disadvantage is that the linear speed of the movable contact at the end of the knife is fast when it moves. When the moving contact is in contact with the static contact, the collision is relatively large.

The principle of direct driving structure: the grounded conductive rod rotates upward in the vertical plane, so that the movable contact on the conductive rod is directly inserted into the grounded static contact to complete the closing. The principle of direct hitting plug-in structure: the grounding conductive rod first makes an upward rotating movement in the vertical plane, so that the moving contact on the grounding conductive rod approaches the ground static contact, and then moves upwards to make the moving contact insert the ground static contact In the head, the closing action is completed. The advantage of the direct drive plug-in structure over the direct drive structure is that it can effectively reduce the impact force when closing, the action is more stable, and the contact between the moving contact and the static contact is better. In addition, due to the direct drive plug-in structure The top and surroundings of the grounding contact fingers can be completely wrapped by static contacts, which has better anti-wind and sand and anti-fouling capabilities.

Summary of the invention

The purpose of the present invention is to provide a direct-acting plug-in high-voltage grounding switch contact with buffering and guiding functions, which can provide a guiding function when closing, and complete the closing action well.

The technical scheme adopted by the present invention is: a direct hitting plug-in grounding switch contact with buffering and guiding functions, including:

A static contact mechanism, the static contact mechanism includes a conductive plate, a guide cover and a grounding contact finger, the guide cover includes a cylinder part and a guide channel, one end of the cylinder part is fixedly connected to the conductive plate, the The guide channel is transversely arranged at the other end of the cylinder, the guide channel is in a "V" shape, and the bottom of the channel of the guide channel is aligned with the cylinder of the cylinder, and the ground contact finger is aligned with the cylinder of the cylinder. Matching cylindrical shape, and set in the cylindrical part;

A movable contact mechanism, the movable contact mechanism includes a grounded conductive rod and a movable contact. The grounded conductive rod rotates around a point on the axis, and the movable contact is arranged at the top of the grounded conductive rod. The guide channel is located on the rotation path of the movable contact, and the guide opening of the guide channel faces the movable contact.

For further optimization, the inner side wall of the guide channel is provided with a buffer device to prevent the impact of the moving contact.

Further optimization, the buffer device includes a first buffer mechanism arranged on both sides of the guide channel, and a second buffer mechanism arranged at the bottom of the channel of the guide channel;

The first buffer mechanism includes two buffer sheets arranged on both sides of the inner wall of the guide channel entrance. The head end of the buffer sheet is fixed on the inner wall of the guide channel through an insulating pad. The guide channel extends in the channel direction, the tail ends of the two buffer sheets are arranged oppositely to form an outlet, and the outlet is smaller than the rod diameter of the movable contact;

The second buffer mechanism includes a guide block, the guide block is provided on the inner wall of the channel bottom of the guide channel, the guide block is U-shaped, and the opening of the guide block is butted with the outlet formed by the two buffer sheets, And the width of the opening is greater than the width of the outlet.

For further optimization, an inner lining made of engineering plastic is provided on the inner side wall of the guide block.

Further optimization, the cylinder is cylindrical, the outer surface of the grounding contact finger is provided with an annular groove, a clamping spring ring is installed in the groove, and the inner side of the grounding contact finger is provided with an inner bushing.

For further optimization, the ground contact fingers are in direct electrical contact with the conductive plate.

According to an embodiment of the present invention, a direct-drive plug-in grounding switch contact with buffering and guiding functions has at least the following beneficial effects: by providing a guiding channel, a guiding function is provided for the grounding conductive rod, so that the grounding conductive rod is in the rotation stroke The end enters the guide channel, and the auxiliary grounding conductive rod can better complete the closing action.

Description of the drawings

The above and/or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

FIG. 1 is a schematic diagram of the structure of a direct driving plug-in grounding switch contact with buffering and guiding functions according to an embodiment of the present invention;

2 is a schematic diagram of the movable contact of the direct driving plug-in grounding switch contact with buffering and guiding functions entering the guiding channel according to the embodiment of the present invention;

Figure 3 is a bottom view of the static contact part of Figure 1;

Fig. 4 is a partial enlarged schematic diagram of the static contact part in Fig. 2.

Detailed ways

The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary, and are only used to explain the present invention, but should not be understood as limiting the present invention.

In the description of the present invention, it should be understood that the orientation description involved, such as up, down, front, back, left, right, etc. indicates the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, but In order to facilitate the description of the present invention and simplify the description, it does not indicate or imply that the device or element referred to must have a specific orientation, be configured and operate in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

In the description of the present invention, several means one or more, multiple means two or more, greater than, less than, exceeding, etc. are understood to not include the number, and above, below, and within are understood to include the number. If it is described that the first and second are only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying the relative importance or implicitly specifying the number of the indicated technical features or implicitly specifying the order of the indicated technical features relationship.

In the description of the present invention, unless otherwise clearly defined, terms such as setting, installation, and connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above terms in the present invention in combination with the specific content of the technical solution.

Referring to the embodiment shown in Figure 1 and Figure 2, the direct-drive plug-in grounding switch contact with buffering and guiding functions includes:

Static contact mechanism. The static contact mechanism includes a conductive plate 100, a guide cover 200 and a grounding contact finger 300. The guide cover 200 includes a cylinder 210 and a guide channel 220. One end of the cylinder 210 is fixedly connected to the conductive plate 100, and the guide channel 220 is horizontally arranged at the other end of the cylinder 210, the guide channel 220 is in a "V" shape, and the bottom of the guide channel 220 is aligned with the cylinder of the cylinder 210, and the ground contact finger 300 is a cylinder that matches the cylinder 210, And set in the barrel;

The movable contact mechanism includes a grounded conductive rod 400 and a movable contact 500. The grounded conductive rod 400 rotates with a point on the axis as the center of the circle. The movable contact 500 is set on the top of the grounded conductive rod 400 and guides the channel. 220 is located on the rotation path of the moving contact 500, and the guiding opening of the guiding channel 220 faces the moving contact 500.

Driven by the corresponding driving device, the moving contact 500 rotates with the grounding conductive rod 400 with a point on the axis as the center. At the end of the upwardly rotating stroke of the grounding conductive rod 400, the moving contact 500 moves from the opening of the guide channel 220 Enter the guide channel 220, and continue along the guide channel 220 until it enters the inner wall of the channel bottom of the guide channel 220. At this time, the grounding conductive rod 400 can be aligned with the barrel 210, that is, aligned with the grounding in the barrel 210 Touch finger 300. Driven by the relevant driving device, the ground conductive rod 400 moves upward to accurately insert the ground contact finger 300 to complete the closing action.

The present invention provides a guiding effect for the grounding conductive rod 400 by providing a guide channel 220, ensuring that the grounding conductive rod 400 is aligned with the grounding contact finger 300 before closing, and assisting the grounding conductive rod 400 to better complete the closing action, avoiding grounding conduction The rod 400 cannot complete the closing action because it is misplaced with the ground contact finger 300 before closing.

In this embodiment, the inner side wall of the guide channel 220 is provided with a buffer device to prevent the moving contact 500 from impacting. In order to prevent the ground conductive rod 400 from impacting the inner side wall of the guide channel 220 when it enters and moves in the guide channel 220, a buffer device is provided on the inner side wall of the guide channel 220 to provide a buffering effect and protect the guide channel 220.

As shown in Figures 3 and 4, the buffer device includes a first buffer mechanism provided on both sides of the guide channel 220, and a second buffer mechanism provided on the bottom of the guide channel 220;

The first buffer mechanism includes two buffer sheets 610 arranged on both sides of the inner wall of the guide channel entrance. The head end of the buffer sheet 610 is fixed on the inner wall of the guide channel 220 through an insulating pad 620, and the tail end of the buffer sheet 610 is guided along the guide channel. The channel 220 extends in the channel direction, the tail ends of the two buffer sheets 610 are arranged oppositely to form an outlet, and the outlet is smaller than the rod diameter of the movable contact 500;

After the moving contact 500 enters the guiding channel, when the moving contact 500 hits the inner wall of the guiding channel 220, the buffer sheet 610 will block it from hitting the inner wall of the guiding channel 220.

At the same time, the head end of the buffer sheet 610 is fixed on the inner wall of the guide channel 220 through the insulating pad 620, so its tail end will be warped. When the movable contact 500 passes through the two buffer sheets 610 to form an exit, the movable contact 500 needs to overcome the clamping force of the two buffer sheets 610, so as to play a buffering effect to reduce the kinetic energy of the movable contact 500; between the two buffer sheets 610 The exit of the, which also plays a guiding role, makes the movable contact 500 enter the channel bottom of the guiding channel in the restricted section of the movable contact 500. The buffer sheet 610 is made of a certain elastic material.

The second buffer mechanism includes a guide block 710. The guide block 710 is arranged on the inner wall of the channel bottom of the guide channel 220. The guide block 710 is U-shaped, and the opening of the guide block 710 is connected to the outlet formed by the two buffer sheets 610, and the width of the opening is larger than Exit width.

The movable contact 500 enters the guide block 710 after passing through the exit between the two buffer sheets 610. The guide block 710 is U-shaped, and its groove is matched with the rod diameter of the movable contact 500, so that the movable contact 500 is connected to the ground The contact finger 300 is aligned. There is a certain gap between the inner wall of the guide block 710 and the outer wall of the buffer sheet 610, and a certain elastic space is reserved for the buffer sheet 610.

The inner wall of the guide block 710 is provided with an inner liner 720 made of engineering plastic. During the life cycle of the device, the moving contact 500 will be repeatedly inserted into the grounding contact finger 300. By providing the inner lining 720, while reducing the friction resistance, the wear resistance is improved and the service life of the equipment is extended.

The cylinder 210 is cylindrical, the outer surface of the ground contact finger 300 is provided with an annular groove, a clamping spring ring 800 is installed in the groove, and an inner liner 900 is provided on the inner side of the ground contact finger 300.

The cylindrical ground contact finger 300 and the round rod-shaped movable contact 500 structure are adopted. The cylindrical ground contact finger 300 is composed of multiple contact fingers, and a clamping spring ring 800 is installed at the outer groove position. The cylindrical grounding contact finger 300 and the round rod-shaped moving contact 500 can ensure reliable contact between each contact finger and the grounding contact finger 300 even when the center line of the moving contact 500 is deviated from the center line of the grounding contact finger 300.

Wherein, the inner bushing 900 first expands the ground contact finger 300 to a certain size, so as to reduce the initial resistance of the movable contact 500 inserting the ground contact finger 300 upward. By clamping the spring ring 800, it is ensured that the ground contact finger 300 and the movable contact 500 have a reliable contact pressure.

In this embodiment, the ground contact finger 300 is in direct electrical contact with the conductive plate 100. Reduce the number of components in the flow path, reduce the conductive contact surface, and prevent other problems such as heat caused by poor contact of the conductive surface.

Of course, the present invention is not limited to the above-mentioned embodiments. Those skilled in the art can also make equivalent modifications or substitutions without departing from the spirit of the invention. These equivalent modifications or substitutions are all included in the claims of this application. In the range.

Claims

A direct-drive plug-in grounding switch contact with buffering and guiding functions, which is characterized in that it comprises:

A static contact mechanism, the static contact mechanism includes a conductive plate (100), a guide cover (200) and a ground contact finger (300), the guide cover (200) includes a barrel (210) and a guide channel (220) , One end of the cylindrical portion (210) is fixedly connected to the conductive plate (100), the guide channel (220) is horizontally arranged at the other end of the cylindrical portion (210), and the guide channel (220) It is a "V" shape, and the bottom of the guide channel (220) is aligned with the cylinder of the cylinder (210), and the ground contact finger (300) matches the cylinder (210) in a cylinder shape, and Set in the barrel (210);

The movable contact mechanism includes a grounded conductive rod (400) and a movable contact (500). The grounded conductive rod (400) rotates with a point on the axis as the center of the circle. The movable contact (500) is located at the top of the ground conductive rod (400), the guide channel (220) is located on the rotation path of the moving contact (500), and the guide opening of the guide channel (220) faces the The moving contact (500).
The direct driving plug-in grounding switch contact with buffering and guiding functions according to claim 1, characterized in that: the inner side wall of the guiding channel (220) is provided with a buffering device to prevent the moving contact (500) from impacting .
The direct-drive plug-in grounding switch contact with buffering and guiding functions according to claim 2, characterized in that: the buffering device comprises a first buffering mechanism arranged on both sides of the guiding channel (220), and A second buffer mechanism at the bottom of the guide channel (220);

The first buffer mechanism includes two buffer sheets (610) arranged opposite to each other on the inner wall of the inlet of the guide channel, and the head end of the buffer sheet (610) is fixed on the guide channel (220) through an insulating pad (620) On the inner wall of the buffer sheet (610), the tail end of the buffer sheet (610) extends along the channel direction of the guide channel (220), and the tail ends of the two buffer sheets (610) are arranged oppositely to form an outlet, and the outlet is smaller than the movable contact (500 )’S rod diameter;

The second buffer mechanism includes a guide block (710) disposed on the inner wall of the channel bottom of the guide channel (220), the guide block (710) is U-shaped, and the guide block The opening of (710) is abutted with the outlet formed by the two buffer sheets (610), and the width of the opening is greater than the width of the outlet.
The direct driving plug-in grounding switch contact with buffering and guiding functions according to claim 3, characterized in that an inner lining (720) made of engineering plastic is provided on the inner side wall of the guiding block (710).
The direct-drive plug-in grounding switch contact with buffering and guiding functions according to any one of claims 1 to 4, characterized in that: the cylindrical portion (210) is cylindrical, and the grounding contact finger (300) A ring-shaped groove is arranged on the outer surface of the groove, a clamping spring ring (800) is installed in the groove, and an inner bushing (900) is arranged on the inner side of the grounding contact finger (300).
The direct driving plug-in grounding switch contact with buffering and guiding functions according to any one of claims 1 to 4, characterized in that: the grounding contact finger (300) is in direct electrical contact with the conductive plate (100).