Opening and closing buffer device of three-position switch

Abstract

The utility model discloses an opening and closing buffer device of a three-position switch in the technical field of power switch equipment, the three-position switch comprises a main shaft, a main knife, a closing contact, a grounding contact and a frame rear plate, the main knife is vertically installed on the main shaft, the frame rear plate is vertically installed on the side face of the main shaft, the main knife rotates along with the main shaft, and the main knife rotates along with the main shaft. The opening and closing buffer device comprises a buffer plate and an elastic buffer pile, the buffer plate is vertically installed on the main shaft, and buffer holes are formed in different positions of the buffer plate. The pile head of the elastic buffer pile faces the buffer plate and is perpendicularly installed on the frame rear plate, elasticity is provided in the direction perpendicular to the frame rear plate so that the pile head can be jacked into the buffer hole in the buffer plate at different positions, and the problem that a buffer structure in the prior art is not resistant to temperature and not economical is solved. The beneficial effects of ensuring the temperature resistance and reducing the cost are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power switch equipment, in particular to a three-position switch opening and closing buffer device. BACKGROUND

[0002] The power three-position switch equipment is a switch equipment capable of closing, carrying and breaking a specific current of a running circuit; it is a load switch, an isolating switch and a grounding switch. Switch overshoot is the distance that the switch continues to move after reaching the opening or closing position. The rated parameters of the switch will specify the allowed value. Switch rebound is the distance that the switch rebounds after reaching the opening or closing position. The rated parameters of the switch will specify the allowed value. When the three-position switch is opened under voltage, the distance between the knife head and the ground end decreases in the switch overshoot stage, and when the distance exceeds the electrical safety distance, ground breakdown will occur, so it is particularly necessary to control the overshoot amplitude of the three-position switch. For the three-position switch with high opening and closing speed requirements, the overshoot is large when the switch is opened, which has the risk of ground breakdown, and the impact kinetic energy is large when the switch is closed, which has the risk of component fracture. In the industry, polyurethane elastic pads are generally installed on both sides of the switch closing contact to serve as a buffer, this material is not resistant to high temperature, high-temperature-resistant rubber materials are not economical, and this scheme can only solve the problem of closing impact. For the opening overshoot problem, a hydraulic buffer can perfectly solve the problem, but the switch operates in a harsh environment, and the cost of the hydraulic buffer meeting the working conditions is high. SUMMARY

[0003] In view of the deficiencies of the prior art, the present application provides a three-position switch opening and closing buffer device to solve the problems of the prior art buffer structure being not temperature-resistant and not economical.

[0004] To achieve the above purpose, the present application is implemented by the following technical solutions:

[0005] A three-position switch opening and closing buffer device, the three-position switch comprising a main shaft, a main knife, a closing contact, a grounding contact and a frame rear plate, the main knife being vertically installed on the main shaft, the frame rear plate being vertically installed on the side of the main shaft, the main knife rotating with the main shaft, the opening and closing buffer device comprising a buffer plate and an elastic buffer pile, the buffer plate being vertically installed on the main shaft, the buffer plate having buffer holes opened at different positions, the elastic buffer pile having a pile head vertically installed on the frame rear plate and providing elasticity in a direction perpendicular to the frame rear plate to enable the pile head to be inserted into the buffer holes on the buffer plate at different positions.

[0006] Preferably, the main knife contacts the closing contact at the closing position and contacts the grounding contact at the grounding switch closing position, the opening position being between the closing position and the grounding switch closing position, and the buffer plate has buffer holes corresponding to the elastic buffer piles at the closing position, the opening position and the grounding switch closing position.

[0007] Preferably, the buffer plate uses a fan-shaped sector plate.

[0008] Preferably, the buffer pile uses a ball assembly, including a mounting cylinder, a ball, a compression spring and a bottom plug, the mounting cylinder is perpendicular to the frame rear plate, the ball is installed in the cylinder, the ball is located at the pile head position and is limited in the cylinder, the mounting cylinder is opened at the pile head position to expose the ball, the bottom plug is fixedly installed at the bottom of the mounting cylinder, and the compression spring is installed between the ball and the bottom plug.

[0009] Preferably, the side of the mounting cylinder is provided with symmetrical wings, and screw fixing holes are opened in the wings.

[0010] Preferably, the wings of the mounting cylinder are fixed on the frame rear plate by screws through the screw fixing holes.

[0011] Preferably, the bottom plug uses a screw plug, the screw plug is opened at the center in the shape of a wrench, and the inner wall of the mounting cylinder is provided with internal threads corresponding to the external threads of the screw plug.

[0012] Preferably, the wrench shape uses an internal hexagon.

[0013] Preferably, the sector plate is opened at the center of the circle with screw fixing holes, and the sector plate is fixed on the end surface of the main shaft by screws through the screw fixing holes.

[0014] Preferably, the buffer hole on the sector plate is a tapered hole, and the diameter of the tapered hole near the pile head end is greater than the diameter of the tapered hole far from the pile head end.

[0015] The beneficial effects of the present application relative to the prior art are that the opening and closing buffer device of the three-position switch provides resistance at the opening and closing position points of the switch, consumes the end kinetic energy of the switch in the opening and closing movement stroke, reduces the overshoot amplitude and impact loss of the switch. The present application effectively reduces the post-closing impact energy of the switch closing, reduces the switch closing impact, and reduces the risk of main shaft fracture; the present application also effectively reduces the kinetic energy of the switch after the opening, suppresses the opening rebound amplitude, avoids the main knife to ground breakdown phenomenon, and the structure is temperature-resistant and simple, which effectively improves the economy of the buffer structure. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a three-dimensional explosion schematic view of an embodiment of the buffer pile of the present application;

[0017] Figure 2 It is a side view schematic view of an embodiment of the buffer pile of the present application installed on the frame rear plate;

[0018] Figure 3 It is Figure 2 A-A sectional view schematic view;

[0019] Figure 4This is a front view schematic diagram of an embodiment of the buffer plate in this solution;

[0020] Figure 5 This is a front view schematic diagram of the rear panel of the frame in one embodiment of this solution;

[0021] Figure 6 This is a side view of a three-position switch in the closed position according to one embodiment of this solution;

[0022] Figure 7 This is a side view of a three-position switch in the open position according to one embodiment of this solution;

[0023] Figure 8 This is a side view of a three-position switch in the closed position of the grounding switch, according to one embodiment of this solution;

[0024] Among them, 1-frame back plate, 2-ball assembly, 21-mounting cylinder, 22-ball, 23-compression spring, 24-bottom plug, 3-fan plate, 4-spindle, 5-main blade, 6-closing contact, 7-grounding contact, 8-screw. Detailed Implementation

[0025] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0026] This application provides an embodiment of a three-position switch opening and closing buffer device: the embodiment includes a mounting cylinder 21, a ball bearing 22, a compression spring 23, a bottom plug 24, and a fan plate 3. The mounting cylinder 21, the ball bearing 22, the compression spring 23, and the bottom plug 24 constitute a ball bearing assembly 2, which constitutes an embodiment of an elastic buffer post.

[0027] The inner diameter of the mounting cylinder 21 is slightly larger than the diameter of the ball bearing 22, while the diameter of its head (i.e., the pile head) is smaller than the diameter of the ball bearing 22. Internal threads are machined on the bottom of the inner wall of the cylinder for installing the plug. The ball bearing 22 is first placed into the mounting cylinder 21, followed by the compression spring 23. The adjusting plug is then screwed on, providing pre-pressure to the ball bearing 22 by pressing against the compression spring 23. The pressure value can be adjusted appropriately by rotating the plug. This ball bearing assembly 2 is mounted on the rear plate 1 of the frame using two screws 8. Then, the fan plate 3 is mounted on the switch main shaft 4 using screws 8. The fan plate 3 has three holes with chamfered edges forming tapered holes. The diameter of the tapered hole near the ball bearing is larger than the diameter far from the ball bearing, allowing the fan plate 3 to accommodate the ball bearing 22 at the main switch's closed, open, and grounded positions. As a preferred embodiment of the bottom plug 24, the screw plug has a wrench shape in the center. In this embodiment, the wrench shape is an internal hexagon, but other suitable wrench shapes can also be used. The bottom plug 24 can also be replaced by screws or other parts. When using other parts, the position of the bottom plug 24 at the bottom of the mounting cylinder 21 may not be adjustable or may not be easy to adjust, thus resulting in poor adjustment of the pre-pressure effect.

[0028] When the switch is opened or closed to the corresponding position, the ball 22 is ejected into the hole of the fan plate 3. When the main blade 5 passes through the stroke, it drives the fan plate 3 to continue rotating in the direction of movement. The fan plate 3 will press the ball back into the mounting barrel 21. The compression spring 23 consumes the rotational energy through the resistance provided by the ball 22. The overstroke distance of the main blade 5 is smaller than when there is no such device.

[0029] It should be noted that once the switch is in position, the mechanism no longer provides kinetic energy to the main blade 5; it continues to rotate only due to inertia.

[0030] After overshoot, the switch will return to the predetermined opening and closing position due to the hard limit of the mechanism, and then continue to move in the direction of return. The distance of continued movement is the rebound. Similarly, the rebound will be limited by the resistance of ball 22.

[0031] The key to the buffer device lies in the design of the force of the compression spring 22 and the position of the ball assembly 2. The farther the ball assembly 2 is from the rotation axis, the longer the lever arm of the ball 22's elastic force, resulting in a better effect. Additionally, while increasing the radius, a weight-reduction design must be implemented for the fan plate 3. Therefore, the fan plate 3, as a fan-shaped embodiment of the buffer plate, can achieve better weight, volume, and cost reduction. Of course, other suitable shapes can also be used for the buffer plate. Controlling the rotational inertia of the overall structure reduces negative impacts. The torque of the buffer device is not necessarily better the larger it is; the torque it provides also acts as resistance during the initial stage of the switch's opening and closing motion, which is detrimental to the switch reaching the intended speed.

[0032] Figures 6-8A practical application scenario is demonstrated using a common three-position switch example. The main switch 5 contacts the closing contact 6 in the closed position and the grounding contact 7 in the grounding switch closed position. The open position is between the travel distances of the closed and grounding switch closed positions. Switches with only two or more positions can also be adjusted accordingly based on the inventive concept of this application.

[0033] In addition to using the ball assembly 2 provided in this application, other flexible buffer piles can also be provided with elasticity in a direction perpendicular to the rear plate 1 of the frame, such as flexible rod heads or other suitable solutions such as adding dome switches to the pile head.

[0034] The above description is only a preferred embodiment of the present solution, but the scope of protection claimed by the present solution is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and inventive concept of this application, should be included within the scope of protection of this application.

Claims

1. A kind of opening and closing buffer device of three-position switch, the three-position switch includes main shaft (4), main knife (5), closing contact (6), ground contact (7), frame back plate (1), the main knife (5) is vertically installed on main shaft (4), the frame back plate (1) is vertically installed on the side of main shaft (4), the main knife (5) follows main shaft (4) rotation, it is characterized by: The invention relates to a buffer plate and elastic buffer pile, the buffer plate is vertically installed on the main shaft (4), the buffer plate has buffer holes at different positions, the pile head of the elastic buffer pile is vertically installed on the frame rear plate (1) and provides elasticity in the direction perpendicular to the frame rear plate (1) to make the pile head penetrate into the buffer hole at different positions on the buffer plate.

2. The opening and closing buffer device of a three-position switch according to claim 1, characterized in that: The main knife (5) contacts the closing contact (6) at the closing position, contacts the grounding contact (7) at the grounding switch closing position, and contacts the closing contact (6) at the opening position, the buffer plate has buffer holes corresponding to the elastic buffer pile at the closing position, the opening position and the grounding switch closing position.

3. The opening and closing buffer device of a three-position switch according to claim 1, characterized in that: The buffer plate uses a fan-shaped fan plate (3).

4. The opening and closing buffer device of a three-position switch according to claim 1, characterized in that: The buffer pile uses a ball bead assembly (2), including a mounting cylinder (21), a ball bead (22), a compression spring (23) and a bottom plug (24), the mounting cylinder (21) is vertically installed on the frame rear plate (1), the ball bead (22) is installed in the cylinder body, the ball bead (22) is located at the pile head position and is limited in the cylinder body, the mounting cylinder (21) has a hole at the pile head position to expose the ball bead (22), the bottom plug (24) is fixedly installed at the bottom of the mounting cylinder (21), and the compression spring (23) is installed between the ball bead (22) and the bottom plug (24).

5. The opening and closing buffer device of a three-position switch according to claim 4, characterized in that: The side surface of the mounting cylinder (21) is provided with symmetrical wings, and screw fixing holes are formed in the wings.

6. The opening and closing buffer device of a three-position switch according to claim 5, characterized in that: The wings of the mounting cylinder (21) are fixed on the frame rear plate (1) by screws (8) through the screw fixing holes.

7. The opening and closing buffer device of a three-position switch according to claim 4, characterized in that: The bottom plug (24) uses a screw plug, the screw plug has a wrench shape in the center, and the inner wall of the mounting cylinder (21) is provided with an inner thread corresponding to the outer thread of the screw plug.

8. The opening and closing buffer device of a three-position switch according to claim 7, characterized in that: The wrench shape uses an internal hexagon.

9. The opening and closing buffer device of a three-position switch according to claim 3, characterized in that: The fan plate (3) has screw fixing holes around the center, and the fan plate (3) is fixed on the end surface of the main shaft (4) by screws (8) through the screw fixing holes.

10. The opening and closing buffer device of a three-position switch according to claim 3, characterized in that: The buffer hole on the fan plate (3) is a tapered hole, and the diameter of the tapered hole near the pile head end is larger than the diameter of the tapered hole far from the pile head end.

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