A direct-strike plug-in earthing switch contact with buffering and guiding functions

Abstract

The present invention discloses a direct-strike plug-in grounding switch contact with buffering and guiding functions, comprising: a static contact mechanism, wherein the static contact mechanism comprises a conductive plate, a guide cover and a grounding contact finger, the guide cover comprises a barrel and a guide channel, one end of the barrel is fixedly connected to the conductive plate, the guide channel is horizontally arranged at the other end of the barrel, the guide channel is in a "V" shape, and the bottom of the guide channel is aligned with the barrel body of the barrel, the grounding contact finger is cylindrical and matches the barrel, and is arranged in the barrel; a moving contact mechanism, wherein the moving contact mechanism comprises a grounding conductive rod and a moving contact, the grounding conductive rod rotates with a point on an axis as the center of a circle, the moving contact is arranged at the top end of the grounding conductive rod, the guide channel is located on the rotation path of the moving contact, and the guide opening of the guide channel faces the moving contact.

Description

Technical Field

[0001] The invention relates to the technical field of power equipment, in particular to a direct-strike plug-in high-voltage grounding switch contact with buffering and guiding functions. Background Art

[0002] In power transmission and distribution systems, high-voltage earthing switches are widely used in substations as electrical devices for grounding protection during equipment maintenance in high-voltage lines. Earthing switches of 550kV and below generally adopt a folding arm structure, a direct-acting structure, or a direct-acting plug-in structure.

[0003] The advantages of the direct-hit structure and the direct-hit insertion structure over the folding-arm structure are that the number of parts is small, the structure is simple, the failure rate is low, and the cost is low; the disadvantages are that the linear speed of the moving contact at the end of the knife switch is fast when it moves, and there is a large collision when the moving contact contacts the static contact.

[0004] The operating principle of the direct-hit structure: the grounding conductive rod rotates upward in the vertical plane, so that the moving contact on the conductive rod is directly inserted into the grounding static contact to complete the closing operation. The operating principle of the direct-hit plug-in structure: the grounding conductive rod first rotates upward in the vertical plane, so that the moving contact on the grounding conductive rod is close to the grounding static contact, and then moves upward in a straight line to insert the moving contact into the grounding static contact to complete the closing operation. The advantages of the direct-hit plug-in structure over the direct-hit structure are that it can effectively reduce the impact force during closing, the operation is smoother, and the contact between the moving contact and the static contact is better. In addition, because the direct-hit plug-in structure can completely wrap the top and surrounding areas of the grounding contact finger with the static contact, it has better protection against wind, sand and dirt. Summary of the Invention

[0005] The object of the present invention is to provide a direct-strike plug-in high-voltage grounding switch contact with buffering and guiding functions, which can provide a guiding effect when closing the switch and complete the closing action well.

[0006] The technical solution adopted by the present invention is: a direct-strike plug-in grounding switch contact with buffering and guiding functions, comprising:

[0007] A static contact mechanism, comprising a conductive plate, a guide cover, and a grounding contact finger. The guide cover comprises a barrel and a guide channel. One end of the barrel is fixedly connected to the conductive plate, and the guide channel is transversely arranged at the other end of the barrel. The guide channel is V-shaped, and the bottom of the guide channel is aligned with the barrel of the barrel. The grounding contact finger is cylindrical and matches the barrel and is arranged inside the barrel.

[0008] The moving contact mechanism includes a grounding conductive rod and a moving contact. The grounding conductive rod rotates with a point on the axis as the center of a circle. The moving contact is arranged at the top end of the grounding conductive rod. The guide channel is located on the rotation path of the moving contact, and the guide opening of the guide channel faces the moving contact.

[0009] Further optimization is made, a buffer device is provided on the inner side wall of the guide channel to prevent the moving contact from impacting.

[0010] Further optimized, the buffer device includes a first buffer mechanism provided on both sides of the guide channel, and a second buffer mechanism provided at the bottom of the guide channel;

[0011] The first buffer mechanism includes two buffer plates arranged opposite to each other on either side of the inner wall of the guide channel entrance, the head ends of the buffer plates being fixed to the inner wall of the guide channel via insulating spacers, the tail ends of the buffer plates extending along the channel direction of the guide channel, the tail ends of the two buffer plates being arranged opposite to each other to form an outlet, and the outlet being smaller than the rod diameter of the moving contact;

[0012] The second buffer mechanism includes a guide block, which is arranged 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 connected to the outlet formed by the two buffer sheets, and the opening width is greater than the outlet width.

[0013] Further optimization is performed by providing an inner lining made of engineering plastic on the inner side wall of the guide block.

[0014] Further optimized, the barrel portion is cylindrical, an annular groove is provided on the outer side of the grounding contact finger, a clamping spring ring is installed in the groove, and an inner sleeve is provided on the inner side of the grounding contact finger.

[0015] In a further optimization, the grounding contact finger is in direct electrical contact with the conductive plate.

[0016] According to an embodiment of the present invention, a direct-strike plug-in grounding switch contact with buffering and guiding functions has at least the following beneficial effects: by setting a guide channel, a guiding effect is provided for the grounding conductive rod, so that the grounding conductive rod enters the guide channel at the end of the rotation stroke, assisting the grounding conductive rod to better complete the closing action. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments with reference to the following drawings, in which:

[0018] Figure 1 This is a structural diagram of a direct-strike plug-in type earthing switch contact with buffering and guiding functions according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of a movable contact of a direct-strike plug-in earthing switch with buffering and guiding functions entering a guide channel according to an embodiment of the present invention;

[0020] Figure 3 yes Figure 1 Bottom view of the middle static contact part;

[0021] Figure 4 yes Figure 2 A partial enlarged schematic diagram of the static contact part. DETAILED DESCRIPTION

[0022] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0023] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0024] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0025] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0026] Reference Figure 1 and Figure 2 The embodiment shown, a direct-strike plug-in earthing switch contact with buffering and guiding functions, comprises:

[0027] 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 barrel 210 and a guide channel 220. One end of the barrel 210 is fixedly connected to the conductive plate 100, and the guide channel 220 is horizontally arranged at the other end of the barrel 210. The guide channel 220 is "V" shaped, and the bottom of the guide channel 220 is aligned with the barrel of the barrel 210. The grounding contact finger 300 is cylindrical and matches the barrel 210 and is arranged inside the barrel.

[0028] The moving contact mechanism includes a grounding conductive rod 400 and a moving contact 500. The grounding conductive rod 400 rotates around a point on the axis. The moving contact 500 is arranged at the top of the grounding 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 moving contact 500.

[0029] Driven by the corresponding driving device, the movable contact 500 rotates along with the grounding conductive rod 400 about a point on the axis. At the end of the upward rotation of the grounding conductive rod 400, the movable contact 500 enters the guide channel 220 from the opening of the guide channel 220 and continues to move along the guide channel 220 until it reaches the inner wall of the channel bottom of the guide channel 220. At this time, the grounding conductive rod 400 is aligned with the barrel 210, that is, the grounding contact finger 300 inside the barrel 210. Driven by the relevant driving device, the grounding conductive rod 400 moves upward and accurately inserts the grounding contact finger 300, completing the closing action.

[0030] The present invention provides a guide channel 220 to provide a guide for the grounding conductive rod 400, ensuring that the grounding conductive rod 400 is aligned with the grounding contact finger 300 before closing the circuit breaker, and assisting the grounding conductive rod 400 to better complete the closing action, thereby avoiding the situation where the grounding conductive rod 400 cannot complete the closing action due to misalignment with the grounding contact finger 300 before closing the circuit breaker.

[0031] In this embodiment, a buffer device is provided on the inner sidewall of the guide channel 220 to prevent the movable contact 500 from impacting the inner sidewall of the guide channel 220. To prevent the grounding conductive rod 400 from impacting the inner sidewall of the guide channel 220 when entering and moving within the guide channel 220, the buffer device is provided on the inner sidewall of the guide channel 220 to provide a buffering effect and protect the guide channel 220.

[0032] like Figure 3 and Figure 4 As shown, the buffer device includes a first buffer mechanism provided on both sides of the guide channel 220, and a second buffer mechanism provided at the bottom of the guide channel 220;

[0033] The first buffer mechanism includes two buffer sheets 610 disposed oppositely on either side of the inner wall of the guide channel entrance. The leading ends of the buffer sheets 610 are fixed to the inner wall of the guide channel 220 via insulating spacers 620. The trailing ends of the buffer sheets 610 extend along the channel direction of the guide channel 220. The trailing ends of the two buffer sheets 610 are disposed oppositely to form an outlet, and the outlet is smaller than the rod diameter of the movable contact 500.

[0034] After the moving contact 500 enters the guide channel, when the moving contact 500 hits the inner wall of the guide channel 220 , the buffer sheet 610 blocks the moving contact 500 from hitting the inner wall of the guide channel 220 .

[0035] The leading end of the buffer sheet 610 is secured to the inner wall of the guide channel 220 via an insulating spacer 620, resulting in a raised tail. When the moving contact 500 passes through the two buffer sheets 610 to form an exit, it must overcome the clamping force of the two buffer sheets 610, thereby buffering the moving contact 500's kinetic energy. The exit between the two buffer sheets 610 also serves as a guide, allowing the moving contact 500 to enter the bottom of the guide channel within its restricted area. The buffer sheets 610 are made of a relatively elastic material.

[0036] The second buffer mechanism includes a guide block 710, which is arranged on the inner wall of the 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 plates 610, and the opening width is greater than the outlet width.

[0037] After passing through the exit between the two buffer plates 610, the movable contact 500 enters the guide block 710. The guide block 710 is U-shaped, and its groove matches the rod diameter of the movable contact 500, ensuring that the movable contact 500 is aligned with the grounding contact finger 300. A certain gap exists between the inner wall of the guide block 710 and the outer wall of the buffer plate 610, leaving a certain amount of elastic space for the buffer plate 610.

[0038] The inner wall of the guide block 710 is provided with an engineering plastic lining 720. During the service life of the device, the movable contact 500 will repeatedly insert into the ground contact finger 300. By providing the lining 720, the friction resistance is reduced while the wear resistance is improved, thereby extending the service life of the device.

[0039] The barrel portion 210 is cylindrical. An annular groove is provided on the outer side of the ground contact finger 300 . A clamping spring ring 800 is installed in the groove. An inner bushing 900 is provided on the inner side of the ground contact finger 300 .

[0040] The structure employs a cylindrical grounding contact finger 300 and a rod-shaped movable contact 500. The cylindrical grounding contact finger 300 is composed of multiple fingers, and a clamping spring ring 800 is installed in the outer groove. The cylindrical grounding contact finger 300 and the rod-shaped movable contact 500 ensure that each contact finger maintains reliable contact with the grounding contact finger 300 even if the centerline of the movable contact 500 deviates from the centerline of the grounding contact finger 300.

[0041] The inner bushing 900 first expands the grounding contact finger 300 to a certain size, thereby reducing the initial resistance of the movable contact 500 when inserting upward into the grounding contact finger 300. The clamping spring ring 800 also ensures reliable contact pressure between the grounding contact finger 300 and the movable contact 500.

[0042] In this embodiment, the grounding contact finger 300 is in direct electrical contact with the conductive plate 100, thereby reducing the number of components in the current path, reducing the conductive contact surface, and preventing other problems such as heat generation caused by poor contact of the conductive surface.

[0043] Of course, the present invention is not limited to the above-mentioned embodiments. Those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A direct-strike plug-in earthing switch contact with buffering and guiding functions, characterized in that: include: A static contact mechanism, the static contact mechanism comprising a conductive plate (100), a guide cover (200) and a grounding contact finger (300), the guide cover (200) comprising a barrel (210) and a guide channel (220), one end of the barrel (210) being fixedly connected to the conductive plate (100), the guide channel (220) being transversely arranged at the other end of the barrel (210), the guide channel (220) being in a "V" shape, and the bottom of the guide channel (220) being aligned with the barrel body of the barrel (210), the grounding contact finger (300) being in a barrel shape matching the barrel (210) and being arranged in the barrel (210); A movable contact mechanism, the movable contact mechanism comprising a grounding conductive rod (400) and a movable contact (500), the grounding conductive rod (400) rotating around a point on an axis, the movable contact (500) being arranged at the top end of the grounding conductive rod (400), the guide channel (220) being located on the rotation path of the movable contact (500), and the guide opening of the guide channel (220) facing the movable contact (500); A buffer device is provided on the inner side wall of the guide channel (220) to prevent the moving contact (500) from impacting, and the buffer device includes a first buffer mechanism provided on both sides of the guide channel (220) and a second buffer mechanism provided at the bottom of the guide channel (220); The first buffer mechanism comprises two buffer sheets (610) arranged oppositely on both sides of the inner wall of the guide channel entrance, the head end of the buffer sheet (610) being fixed on the inner wall of the guide channel (220) via an insulating spacer (620), the tail end of the buffer sheet (610) extending along the channel direction of the guide channel (220), the tail ends of the two buffer sheets (610) being arranged oppositely to form an outlet, and the outlet being smaller than the rod diameter of the moving contact (500); The second buffer mechanism comprises a guide block (710), the guide block (710) being arranged on the inner wall of the channel bottom of the guide channel (220), the guide block (710) being U-shaped, the opening of the guide block (710) being docked with the outlet formed by the two buffer sheets (610), and the width of the opening being greater than the width of the outlet, and a certain gap being present between the inner wall of the guide block (710) and the outer wall of the buffer sheet (610).

2. The direct-strike plug-in earthing switch contact with buffering and guiding functions according to claim 1, characterized in that: An inner lining (720) made of engineering plastic is provided on the inner side wall of the guide block (710).

3. The direct-strike plug-in earthing switch contact with buffering and guiding functions according to claim 1 or 2, characterized in that: The barrel (210) is cylindrical, the outer side of the grounding contact finger (300) is provided with an annular groove, a clamping spring ring (800) is installed in the groove, and the inner side of the grounding contact finger (300) is provided with an inner sleeve (900).

4. The direct-strike plug-in earthing switch contact with buffering and guiding functions according to claim 1 or 2, characterized in that: The grounding contact finger (300) is in direct electrical contact with the conductive plate (100).

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