Open-type grounding switch and buffer

Abstract

The utility model belongs to the technical field of high-voltage air circuit breakers without arc extinguishing or arc preventing devices, and particularly relates to an open-type grounding switch and a buffer. According to the open-type grounding switch, the buffer with the rainproof structure is used, the rainproof cover is additionally arranged on the buffer, when the piston is located at the lower dead center, the matching position of the rainproof cover and the piston rod is located above the working cylinder body, and the lower end of the rainproof cover is located above the lower end of the working cylinder body, so that under the outdoor working condition, the working cylinder body is not damaged. Rainwater can be effectively prevented from entering the working cavity of the buffer, the working stability of the buffer is ensured, the service life of the buffer is prolonged, impact and vibration caused by a knife switch can be relieved and eliminated when opening is in place, and use safety and structural stability of the open type grounding switch are ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to high pressure air circuit breaker technology field of no arc extinguishing or arc prevention device, especially relates to an open type grounding switch and buffer. BACKGROUND

[0002] The open type grounding switch is mainly used for on-off control of high voltage grade circuit, and the structure of a typical open type grounding switch is shown in the invention patent with the international publication number WO2014 / 190906 and the international publication date of December 4, 2014; according to the description in the patent specification, the common open type grounding switch comprises a base frame, the base frame is connected with a grounding blade capable of swinging up and down, the top end of the grounding blade is provided with a moving contact, when the grounding blade swings to the vertical position, a static contact is arranged at the position corresponding to the moving contact, and the moving contact and the static contact are inserted and matched to realize closing. A transmission structure connected with an operating mechanism is arranged between the base and the grounding blade, the transmission structure comprises a support rod and a connecting rod which are sequentially hinged, the end of the support rod is hinged to the base for being connected with the operating mechanism, and the end of the connecting rod is hinged to the grounding blade. When the opening operation is performed, the moving contact and the static contact are separated, the operating mechanism drives the connecting rod to rotate through the support rod, drives the grounding blade to swing downward, and the grounding blade moves from the vertical state to the horizontal state, and the opening is completed.

[0003] When the opening is completed, since the grounding blade has a certain rotating speed and rotational inertia, the grounding blade will continue to rotate downward, so that the whole machine is impacted and vibrates. If the grounding blade is short and light in weight and small in rotational inertia, the impact is small, and the open type grounding switch can be normally used; however, for the open type grounding switch with high voltage and large current, since the grounding blade is long (more than 6 meters) and heavy in weight and large in rotational inertia, the impact is large, the stability of the opening and closing operation of the open type grounding switch and the reliability of long-term use are seriously affected, and meanwhile, the other connected substation products are vibrated through the connecting line, which brings unstable factors to the safe operation of the substation.

[0004] Therefore, it is necessary to install the buffer in the open type grounding switch for the on-off control of the high voltage grade circuit. According to the description in the above patent specification, the buffer is mainly divided into two types, hydraulic buffer and spring buffer, and the spring buffer is most widely used, and the existing spring buffer usually comprises a working cylinder, the working cylinder is internally provided with a working cavity of the buffer, a limiting support column is arranged in the working cavity, a spring is arranged in the working cavity along the direction of the limiting support column, a piston is further arranged in the working cylinder, the bottom end of the piston is arranged at the top end of the spring in the working cavity, a buffer pad is arranged at the end face position of the piston rod, and the buffer pad is used for receiving the vibration and impact from the outside of the buffer.

[0005] The open grounding switch is generally applied to outdoor power stations and is easily affected by environmental factors such as rain, snow, dust and the like, wherein rainwater is usually acidic and has great influence and harm on the buffer of the open grounding switch. After the rainwater penetrates into the working cavity of the buffer, the aging and wear of the piston and spring in the working cavity of the buffer are accelerated, so that the service life of the buffer is reduced, the function is failed, the work of eliminating vibration and impact cannot be completed, and the use safety and structural stability of the whole machine are affected.

[0006] Generally, the rainproof function of the working cavity of the buffer is mainly realized by cooperation of the piston rod and the working cylinder body, although a certain protection is achieved, but the operation requirement cannot be completely met. Especially in the harsh environment of high altitude area, the rainwater enters the working cavity through the gap between the piston rod and the working cylinder body, corrodes the piston and spring, makes the service life short, the function fails fast, cannot resist impact, and safety accidents are easily caused. Practical new type content

[0007] The buffer is provided to solve the problem that rainwater corrodes the components in the working cavity of the buffer of the open grounding switch under outdoor conditions.

[0008] Meanwhile, the purpose of the utility model is also to provide an open grounding switch to solve the above problems.

[0009] In order to solve the above problems, the buffer of the utility model adopts the following technical scheme:

[0010] A buffer comprises a working cylinder body and a piston installed in the working cylinder body, a piston rod of the piston extends from an upper end of the working cylinder body to outside the working cylinder body, a rainproof cover is arranged at an end of the piston rod outside the working cylinder body, the rainproof cover shields the connection between the piston rod and the working cylinder body, when the piston is at the lower dead point, the cooperation position of the rainproof cover and the piston rod is above the working cylinder body, and the lower end of the rainproof cover is above the lower end of the working cylinder body, so that the rainproof cover and the working cylinder body do not interfere with each other in the process that the piston moves from the upper dead point to the lower dead point.

[0011] Further, the rainproof cover is directly fixed on the piston rod.

[0012] Further, an external thread is arranged on the piston rod, a threaded hole matched with the external thread on the piston rod is arranged on the rainproof cover, and the rainproof cover is directly screwed on the piston rod.

[0013] Further, a buffer pad is fixedly arranged at the upper end of the piston rod, and the buffer pad vertically shields the threaded cooperation position of the rainproof cover and the piston rod.

[0014] Further, the buffer pad is a cap-shaped buffer pad and is installed at the top end of the piston rod through an internal thread.

[0015] Further, the rain cover comprises a cylindrical cover wall, and an end plate is arranged at the upper end of the cover wall, and the rain cover is connected with the piston rod through the end plate.

[0016] Further, the working cylinder body comprises a cylinder sleeve and a cylinder cover arranged at the top end of the cylinder sleeve, and the cylinder cover is threadedly connected with the cylinder sleeve, and the lower end of the cover wall extends below the connecting position of the cylinder cover and the cylinder sleeve when the piston is at the top dead center.

[0017] Further, a drain hole is arranged at the lower end of the working cylinder body.

[0018] Further, a limiting support column is arranged in the working cylinder body, and the upper end of the limiting support column is used for limiting the piston.

[0019] Beneficial effects: the buffer of the utility model increases the rain cover, and the matching position of the rain cover and the piston rod is above the working cylinder body when the piston is at the bottom dead center, and the lower end of the rain cover is above the lower end of the working cylinder body, rainwater can be effectively prevented from entering the working cavity of the buffer under outdoor operation conditions, the working stability of the buffer is ensured, and the service life of the buffer is prolonged; the utility model has strong universality and can be applied to various occasions requiring vibration and impact to be slowed down or eliminated.

[0020] The open-type grounding switch adopts the following technical scheme:

[0021] An open-type grounding switch comprises a conductive blade and a buffer, the buffer comprises a working cylinder body and a piston installed in the working cylinder body, a piston rod of the piston extends out of the working cylinder body from the upper end of the working cylinder body, a rain cover is arranged at the end of the piston rod outside the working cylinder body, the rain cover covers the connecting position of the piston rod and the working cylinder body, the matching position of the rain cover and the piston rod is above the working cylinder body when the piston is at the bottom dead center, and the lower end of the rain cover is above the lower end of the working cylinder body, so that the rain cover and the working cylinder body do not interfere with each other in the process that the piston moves from the top dead center to the bottom dead center.

[0022] Further, the rain cover is directly fixed on the piston rod.

[0023] Further, an external thread is arranged on the piston rod, a threaded hole matched with the external thread on the piston rod is arranged on the rain cover, and the rain cover is directly threadedly assembled on the piston rod.

[0024] Further, a buffer pad is fixedly arranged at the upper end of the piston rod, and the buffer pad covers the threaded matching position of the rain cover and the piston rod in the vertical direction.

[0025] Further, the buffer pad is a cap-shaped buffer pad and is installed at the top end of the piston rod through an internal thread.

[0026] Further, the rain cover comprises a cylindrical cover wall, an upper end of the cover wall is provided with an end plate, and the rain cover is connected with the piston rod through the end plate.

[0027] Further, the working cylinder body comprises a cylinder sleeve and a cylinder cover arranged at a top end of the cylinder sleeve, the cylinder cover is threadedly connected with the cylinder sleeve, and when the piston is located at the top dead center, the lower end of the cover wall extends below the connecting position of the cylinder cover and the cylinder sleeve.

[0028] Further, a drain hole is arranged at a lower end of the working cylinder body.

[0029] Further, a limiting support column is arranged in the working cylinder body, and an upper end of the limiting support column is used for limiting the piston.

[0030] Beneficial effects: The utility model discloses an improved buffer, which comprises a rain cover, a piston rod, a piston, a buffer pad, a cylinder sleeve, a cylinder cover, a spring and a drain hole. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a structural schematic view of an embodiment of the buffer of the utility model;

[0032] Figure 2 It is a structural schematic view of an embodiment of the buffer of the utility model; Figure 1 It is a partial sectional view of the embodiment structure.

[0033] In the drawing: 1, buffer pad; 2, cylinder sleeve; 3, rain cover; 4, mounting plate; 5, piston; 6, buffer pad; 7, guide column; 8, cylinder cover; 9, spring; 10, drain hole. DETAILED DESCRIPTION

[0034] The features and performances of the utility model will be further described in detail in combination with the embodiments.

[0035] The buffer of the utility model can cope with the challenge of outdoor environment by increasing the rainproof structure, effectively prevents rainwater from entering the working cavity inside the buffer, reduces the influence and harm of rainwater on the parts in the working cavity, prolongs the working life of the buffer, and ensures the working stability of the buffer.

[0036] As Figure 1 , 2As shown, in a basic embodiment, the buffer of the utility model includes working cylinder body, rain cover 3 and buffer pad 1, working cylinder body is composed of mounting plate 4, cylinder sleeve 2 and cylinder cover 8, the inside of working cylinder body is the working cavity of buffer, and piston 5 and spring 9 are installed in the inside of working cavity.The upper and lower ends of cylinder sleeve 2 are provided with external threads, and mounting plate 4 and cylinder cover 8 are connected with cylinder sleeve 2 through the external threads on cylinder sleeve 2, piston 5 is installed in working cylinder body, the piston rod of piston 5 extends from the upper end of working cylinder body to the outside of working cylinder body, and buffer pad 1 is fixed on the end face of piston rod.Under the condition of not receiving external force, the pre-tightening force of spring 9 makes piston 5 tightly adhere to cylinder cover 8, the end of piston rod located outside working cylinder body is provided with rain cover 3, the gap between piston rod and working cylinder body is shielded, and rainwater is prevented from entering the inside of working cavity, when buffer pad 1 is subjected to external force, piston 5 moves downward, and compresses spring 9, when the external force is large enough, the lower dead point is reached, in this process, rain cover and working cylinder body always maintain a certain distance, and do not interfere with each other, when piston 5 is located at the lower dead point, the matching position of rain cover 3 and piston rod is located above working cylinder body, and the lower end of rain cover 3 is located above the lower end of working cylinder body.

[0037] In other embodiments, the buffer components can be connected by other means, for example, the buffer pad 1 and the piston 5 are connected by using the adhesive means, which is also within the protection scope of the patent.

[0038] In a preferred embodiment, the rain cover 3 is directly fixed on the piston rod, and remains relatively static with the piston 5, to ensure sufficient protection effect, at the same time, the piston rod is provided with external threads, and the rain cover 3 is provided with a threaded hole matched with the external threads on the piston rod, the rain cover is directly screwed on the piston rod, which is convenient for installation, disassembly and replacement. The buffer pad 1 is fixedly arranged at the upper end of the piston rod, the buffer pad shields the threaded matching position of the rain cover 3 and the piston rod in the vertical direction, to prevent rainwater from entering the buffer working cavity from the threaded matching position of the rain cover 3 and the piston rod, and then entering the buffer working cavity, thereby enhancing the rainproof effect of the buffer.

[0039] In other embodiments, the rain cover 3 can be integrally formed with the buffer pad 1 or connected by adhesive, which can also effectively solve the problems in the prior art, but the buffer pad 1 is a vulnerable component and needs to be replaced frequently, and it is not convenient to replace it alone, which will increase the maintenance cost; the buffer pad can also not be arranged on the end face of the piston rod, and the piston can be replaced by a material with higher strength to prevent damage.

[0040] In a preferred embodiment, the buffer pad 1 is designed as a cap-shaped structure, which can better play a buffering role while taking into account the rainproof effect. The buffer pad 1 is provided with a threaded hole at the end face and is mounted at the top end of the piston rod through the threaded hole, thereby reducing the processing procedure and optimizing the buffer structure. The rain cover 3 includes a cylindrical cover wall, and the upper end of the cover wall is provided with an end plate. The center of the end plate is provided with a threaded hole matched with the piston rod, and the rain cover 3 is connected with the piston rod through the threaded hole in the center of the end plate.

[0041] In other embodiments, the shape of the buffer pad 1 can also be saddle-shaped or triangular prism-shaped. However, other shapes have small universality, and replacement requires special spare parts.

[0042] As shown in the drawings, Figure 2 In a preferred embodiment, the working cylinder body includes a cylinder sleeve 8 and a cylinder cover 2 arranged at the top end of the cylinder sleeve. The cylinder cover 8 is threadedly matched with the cylinder sleeve 2. When the piston 5 is located at the top dead center, the lower end of the cover wall extends below the connection position of the cylinder cover 8 and the cylinder sleeve 2, thereby ensuring complete shielding of the gap of the working cylinder body and preventing rainwater from entering. In order to avoid continuous corrosion of the parts in the working cavity caused by accidental entry of rainwater, two drainage holes 10 are arranged at the bottom end of the working cylinder body, i.e. at the recess on the mounting plate 4, thereby ensuring that the cavity can be quickly drained even if rainwater enters. Of course, it is not meant that the drainage holes can only be two. In fact, it does not deny that a plurality of other drainage holes are also arranged. These changes still belong to the contribution of the present application to the prior art and still belong to the scope of protection of the present patent. A limiting support column 7 is arranged in the working cavity of the buffer. The limiting support column 7 is fixed on the mounting plate 4 through a screw and a nut. The spring 9 is arranged inside the working cavity in the direction of the limiting support column 7, thereby limiting the compression and rebound direction of the spring 9. When an external force is applied, the piston 5 moves downward. When the external force is large enough, the piston 5 contacts the end face of the limiting support column 7, thereby reaching the bottom dead center. Since the working cylinder is easily subjected to a large impact, the piston 5 maintains a high speed when it moves to the bottom dead center. In order to prevent the piston 5 and the limiting support column 7 from being damaged by collision, a buffer pad 6 is arranged at the end face of the limiting support column 7 in contact with the piston 5, thereby reducing the impact.

[0043] In other embodiments, the limiting support column 7 can be replaced by a fixed boss on the mounting plate 4, which can play the same role.

[0044] The specific implementation scheme of the open-type grounding switch of the present application is as follows:

[0045] The open-type grounding switch of the present application includes a buffer, and the implementation mode of the buffer is as shown above, which will not be described again.

[0046] The above merely describes preferred embodiments of the present application, and is not used to limit the present application, and the patent protection scope of the present application is subject to the claims, and any equivalent structural changes made according to the content of the specification and drawings of the present application should also be included in the protection scope of the present application.

Claims

1. A buffer, comprising a working cylinder and a piston mounted in the working cylinder, wherein the piston rod extends from the upper end of the working cylinder to the outside of the working cylinder, characterized in that: A rain cover is provided at one end of the piston rod located outside the working cylinder body, and the rain cover covers the fitting position of the piston rod and the working cylinder body. When the piston is at the bottom dead center, the fitting position of the rain cover and the piston rod is located above the working cylinder body, and the lower end of the rain cover is located above the lower end of the working cylinder body, so that the rain cover and the working cylinder body do not interfere with each other during the process of the piston moving from the top dead center to the bottom dead center.

2. The buffer according to claim 1, characterized in that The rain cover is directly fixed on the piston rod.

3. The buffer according to claim 2, characterized in that The piston rod is provided with an external thread, the rain cover is provided with a threaded hole matching the external thread on the piston rod, and the rain cover is directly threadedly assembled on the piston rod.

4. The buffer according to claim 3, characterized in that A buffer pad is fixedly provided on the upper end of the piston rod, and the buffer pad vertically shields the threaded fitting position of the rainproof cover and the piston rod.

5. The buffer according to claim 4, characterized in that The buffer pad is a cap-shaped buffer pad and is installed on the top end of the piston rod through an internal thread.

6. The buffer according to any one of claims 1 to 5, characterized in that: The rainproof cover comprises a cylindrical cover wall, an upper end of the cover wall is provided with an end plate, and the rainproof cover is connected to the piston rod through the end plate.

7. The buffer according to claim 6, characterized in that The working cylinder body includes a cylinder liner and a cylinder cover arranged on the top of the cylinder liner. The cylinder cover is threadedly matched with the cylinder liner. When the piston is at the top dead center, the lower end of the cover wall extends below the connection position between the cylinder cover and the cylinder liner.

8. The buffer according to any one of claims 1 to 5, characterized in that: A drainage hole is provided at the lower end of the working cylinder body.

9. The buffer according to any one of claims 1 to 5, characterized in that: A limiting support column is provided in the working cylinder body, and the upper end of the limiting support column is used for limiting the piston.

10. An open type grounding switch, comprising a buffer, characterized in that: The buffer is the buffer according to any one of claims 1 to 9.

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