A grounding switch

Abstract

The utility model discloses a grounding switch, its technical scheme main points, including frame, be provided with static contact, movable contact and rotating rotating shaft on the frame, movable contact realizes with static contact's closing or opening under the drive of rotating shaft, be provided with clamping mechanism on movable contact, when closing, clamping mechanism exerts the clamping force of clamping static contact to movable contact, when opening, and clamping mechanism removes its exerted clamping force, the utility model discloses through setting up clamping mechanism, provides the clamping force guarantee closing contact stable when closing, removes the clamping force guaranteeing quick opening when opening.

Description

Technical Field

[0001] This utility model relates to the field of high voltage switchgear technology, and more specifically to a grounding switch. Background Technology

[0002] A grounding switch is a special-purpose mechanical switch with a certain ability to close short-circuit currents. It is used to ground the switchgear and its lines during maintenance to protect personnel safety. Additionally, because short-circuit faults may exist in the circuit, the grounding switch needs to quickly ground the switchgear to eliminate fault arcs within the switchgear.

[0003] Existing grounding switches generally include moving contacts, stationary contacts, a rotating shaft, and a spring mechanism. The moving contacts and stationary contacts are controlled to open and close by rotating the shaft in coordination with the dead position of the spring mechanism.

[0004] Currently, the contact pressure of the moving and stationary contacts of existing grounding switches is manually adjusted by screws. However, the contact pressure requirements for closing and opening are different. When closing, a large contact pressure must be ensured between the moving and stationary contacts, while the contact pressure should not be too large when opening, otherwise it will lead to difficulty in opening. Therefore, it is difficult to balance the two by manually adjusting the screws. If the screws are adjusted too tightly, the closing contact is stable but the opening is difficult. If the screws are adjusted too loosely, the opening is fast but the closing is unstable. In addition, after a period of use, the stationary and moving contacts will wear down, making the contact even more unstable. Therefore, the traditional method of adjusting the contact pressure by adjusting the screws is very inconvenient and unreliable. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a grounding switch that, by setting a clamping mechanism, provides clamping force during closing to ensure stable closing contact, and releases the clamping force during opening to ensure rapid opening.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a grounding switch, comprising a frame, wherein a stationary contact, a moving contact, and a rotating shaft are disposed on the frame, and the moving contact is driven by the rotating shaft to achieve closing or opening with the stationary contact; characterized in that: a clamping mechanism is disposed on the moving contact; when closing, the clamping mechanism applies a clamping force to the moving contact to clamp the stationary contact, and when opening, the clamping mechanism releases the clamping force it applies.

[0007] The present invention is further configured such that: the clamping mechanism includes clamping plates on both sides and a driving component located between the clamping plates on both sides; a connecting rod is provided in the middle of the clamping plates on both sides for connection; the upper and lower ends of the clamping plates form a rocker structure with the connecting rod in the middle as the fulcrum; the driving component is used to open the lower end of the clamping plate so that the upper end of the clamping plate is clamped.

[0008] The present invention is further configured such that: the inner side of the moving contact on both sides is provided with abutting member, and when the circuit is opened, the driving member acts on the abutting member to push the moving contact outward.

[0009] The present invention is further configured such that a clamping plate is provided on the outer side of the connecting rod.

[0010] The present invention is further configured such that: the driving component is provided with a stretching block that can move up and down; when the stretching block moves down or up and acts on the lower end of the clamping plate, the lower end of the clamping plate is stretched open; when the stretching block disengages from the lower end of the clamping plate, the lower end of the clamping plate retracts and resets.

[0011] The present invention is further configured such that: the driving component includes a linkage rod and a transmission plate, the transmission plate is provided with an arc-shaped guide hole, the upper end of the linkage rod is fixedly connected to the spreading block, the lower end is provided with a connecting pin, and the connecting pin is provided to slide within the guide hole.

[0012] The present invention is further configured such that: a power paddle is provided on the rotating shaft and rotates synchronously therewith, and a connecting screw is provided between the power paddle and the transmission plate to realize the linkage between the power paddle and the transmission plate.

[0013] The present invention is further configured such that: a connecting plate is rotatably mounted on the rotating shaft, one end of the connecting plate is fixedly connected to the moving contact, and the other end is connected to the spring mechanism through a locking pin; a slot is provided in the connecting plate, and the linkage rod is placed in the slot and slides therein.

[0014] The present invention is further configured such that: the power paddle is provided with a toggle groove, the two ends of the toggle groove are used to drive the pin to move, and the stroke of the two ends of the toggle groove is adapted to the arc stroke of the guide hole.

[0015] The present invention is further configured such that a lap piece is provided between the upper end of the clamping plate and the moving contact.

[0016] In summary, this utility model has the following beneficial effects:

[0017] Compared with the prior art, this utility model has a clamping mechanism on the moving contact. The clamping plate of the clamping mechanism can apply clamping force to the moving contact from the outside to the inside when the circuit is closed, thereby increasing the contact pressure between the moving contact and the stationary contact and increasing the connection stability. When the circuit is opened, the clamping mechanism can quickly release the clamping force, so that the contact pressure between the moving contact and the stationary contact is reduced, which facilitates quick opening. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the grounding switch.

[0019] Figure 2This is a magnified three-dimensional structural diagram of the stationary and moving contacts.

[0020] Figure 3 This is a schematic diagram of the exploded structure of the moving contact and clamping mechanism.

[0021] Figure 4 This is a schematic diagram of the cross-sectional structure of the moving contact.

[0022] Figure 5 This is a schematic diagram of the explosive structure of the drive component at the rotating shaft extending and retracting vertically.

[0023] Figure 6 This is a schematic diagram of the cross-sectional structure of the power paddle shifter.

[0024] Figure 7 This is a schematic diagram of the cross-sectional structure when the transmission plate drives the linkage rod to move upward.

[0025] Figure 8 This is a schematic diagram of the cross-sectional structure when the transmission plate drives the linkage rod to move downward.

[0026] Figure 9 This is a schematic diagram of the structure when the clamping mechanism is not clamped.

[0027] Figure 10 This is a schematic diagram of the clamping mechanism when it is clamping.

[0028] Figure 11 This is a schematic diagram of the second embodiment of the abutment component.

[0029] Figure 12 This is a schematic diagram of the cross-sectional structure of the second embodiment of the abutment component.

[0030] Reference numerals: 1. Frame; 101. Stationary contact; 102. Moving contact; 103. Rotating shaft; 2. Clamping plate; 3. Driving component; 301. Spreading block; 302. Linkage rod; 3021. Connecting pin; 303. Transmission plate; 3031. Guide hole; 4. Connecting rod; 5. Pressing plate; 6. Power lever; 601. Actuating groove; 6011. Upper hook; 6012. Lower hook; 7. Connecting screw; 8. Connecting plate; 801. Hollow groove; 802. Locking pin; 9. Abutting component; 10. Laying piece; 11. Spring mechanism. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to the accompanying drawings.

[0032] This embodiment discloses a grounding switch, such as Figure 1-12As shown, the device includes a frame 1, on which a stationary contact 101, a moving contact 102, and a rotating shaft 103 are mounted. The moving contact 102 is driven by the rotating shaft 103 to close or open with the stationary contact 101. The instantaneous movement of the rotating shaft 103 during closing and opening is powered by a spring mechanism 11. The working principle of closing and opening is the same as in the prior art. A feature of this embodiment is that a clamping mechanism is provided on the moving contact 102; during closing, the clamping mechanism applies a clamping force to the moving contact 102 to clamp the stationary contact 101; during opening, the clamping mechanism releases the applied clamping force. Specifically, refer to... Figure 2-3 The clamping mechanism includes clamping plates 2 on both sides and a driving component 3 located between the clamping plates 2 on both sides. A connecting rod 4 is provided in the middle of the clamping plates 2 on both sides for connection. The upper and lower ends of the clamping plates 2 form a rocker structure with the connecting rod 4 in the middle as the fulcrum. The driving component 3 is used to open the lower end of the clamping plate 2 so that the upper end of the clamping plate 2 is clamped. Through the above structure, the rocker structure formed allows the upper and lower ends of the clamping plate 2 to move relative to each other. That is, when the lower end is opened, the upper end is clamped. When the lower end retracts and resets, the upper end is released from clamping and is in a relaxed state.

[0033] Furthermore, abutment members 9 are provided on the inner side of the moving contacts 102 on both sides. When the circuit is opened, the driving member 3 acts on the abutment members 9 to push the moving contacts 102 outward. Specifically, as a first embodiment of the abutment members 9, refer to... Figure 3 The abutment component 9 can be configured as a sheet-like structure, fixed by the connecting rod 4. Its functions are twofold: first, to control the gap between the moving contacts 102 on both sides, preventing deformation of the moving contacts due to excessive clamping by the clamping mechanism; and second, to provide support for the drive component 3, which has an extension rod extending from its upper part. This extension rod can rest between the abutment components 9 on both sides. During opening, the extension rod can further push the abutment component 9 and the moving contacts 102 outwards. The advantage is that the moving and stationary contacts can be separated before opening, further reducing wear on the moving and stationary contacts during opening, and also preventing arcing problems to some extent during opening. A second embodiment of the abutment component 9 is shown below. Figure 11 It relies on a round-headed screw to be directly screwed into the gap in the middle of the moving contact 102. This structure is simpler and lower in cost, and its basic function is the same as the first embodiment. Furthermore, this structure has another advantage: in the first embodiment, the abutting component 9 is threaded onto the connecting rod 4 and is not completely fixedly connected to the moving contact 102; it can only push the moving contact outwards but cannot pull it inwards. In the second embodiment, the abutting component 9 is directly fixed to the moving contact 102. When the moving contact 102 is closed and energized, referring to… Figure 12 The abutment parts 9 on both sides will produce something like Figure 12The electromagnetic attraction indicated by the dashed arrow pulls the moving contacts on both sides closer together and clamps them by abutting component 9, which can further strengthen the clamping force of moving contact 102.

[0034] Furthermore, in order to ensure clamping force, a clamping plate 5 is provided on the outside of the connecting rod 4. The clamping plate 5 is preferably a composite stack of multiple sets of springs. When the lower end of the clamping plate 2 is opened, the lower end of the clamping plate 5 will also be opened, thereby causing the upper end of the clamping plate 5 to generate an inward tilting force. This force acts on the clamping plate 2, further increasing the clamping force at the upper end of the clamping plate 2.

[0035] Furthermore, refer to Figure 9-10 The driving component 3 is provided with a support block 301 that can move vertically and retractably. The first embodiment of the driving component 3, which is a preferred embodiment of this utility model, is as follows: Figure 10 As shown, when the spreading block 301 moves downward and acts on the lower end of the clamping plate 2, the lower end of the clamping plate 2 is spread open; the lower end of the clamping plate 2 undergoes outward deformation, and then the upper end of the clamping plate 2 will generate an opening as shown in the diagram. Figure 10 The inward clamping force, indicated by the middle arrow, acts on the moving contact 102, increasing the contact pressure between the moving contact 102 and the stationary contact 101, ensuring a stable connection. It should be noted that... Figure 10 To clearly illustrate the principle, the deformation of clamping plate 2 has been exaggerated. In reality, clamping plate 2 only needs slight deformation to generate sufficient clamping force. (Refer to...) Figure 9 When the expanding block 301 moves upward and disengages from the lower end of the clamping plate 2, the lower end of the clamping plate 2 retracts and resets, and the upper end of the clamping plate 2 does not generate clamping force on the moving contact, facilitating quick circuit breaking. Simultaneously, to reduce wear on both ends of the clamping plate 2, round-head screws are installed at corresponding positions on the clamping plate 2. Their smooth round-head surfaces reduce wear, and even if the round-head screws wear out, they can be easily replaced.

[0036] As a second embodiment of the driving component 3, the opening block 301 can also be initially set below the lower end of the clamping plate 2. In this way, the opening block 301 can open the lower end of the clamping plate 2 by moving upward, and then separate the opening block 301 from the lower end of the clamping plate 2 by moving downward. The principle is the same as that of the first embodiment of the driving component 3, only the way of moving up and down is different.

[0037] Furthermore, in order to achieve vertical movement of the expanding block 301, refer to Figure 5-8The driving component 3 includes a linkage rod 302 and a transmission plate 303. The transmission plate 303 has an arc-shaped guide hole 3031. The upper end of the linkage rod 302 is fixedly connected to the expansion block 301, and the lower end is provided with a connecting pin 3021, which slides within the guide hole 3031. With this structure, when the transmission plate 303 deflects, the guide hole 3031 deflects synchronously, causing the connecting pin 3021 within it to move, thereby driving the linkage rod 302 and the expansion block 301 to move.

[0038] Furthermore, the power for the transmission plate 303 is provided by the power paddle 6. The rotating shaft 103 is configured as a shaft with a V-shaped notch, and the power paddle 6 also has a matching V-shaped structure. Therefore, the power paddle 6 rotates synchronously with the rotating shaft 103, and the power paddle 6 and the transmission plate 303 are linked together by the connecting screw 7. Through the above structure, the rotation of the rotating shaft 103 drives the power paddle 6 to rotate, and the power paddle 6 drives the transmission plate 303 through the connecting screw 7. Then, the guide groove 3031 on the transmission plate 303 drives the linkage rod 302 and the expansion block 301 to move.

[0039] Furthermore, a connecting plate 8 is rotatably mounted on the rotating shaft 103. One end of the connecting plate 8 is fixedly connected to the moving contact 103, and the other end is connected to the spring mechanism 11 via a locking pin 802. A slot 801 is provided inside the connecting plate 8, and the linkage rod 302 is housed in the slot 801 and slides within it. Thus, the linkage rod 302 can only slide up and down in the slot 801. With the help of the guide hole 3031 and the connecting pin 3021, it can move up and down by deflecting the guide hole 3031.

[0040] Furthermore, the power paddle 6 is provided with a toggle groove 601, the two ends of which are used to drive the locking pin 802 to move, and the stroke of the two ends of the toggle groove 601 is adapted to the arc-shaped stroke of the guide hole 3031. Based on the above structure, first refer to... Figure 6 The two ends of the actuating groove 601 are the upper hook 6011 and the lower hook 6012, respectively. When the spring mechanism 11 passes the dead point and drives the connecting plate 8 to the closed position, the locking pin 802 is pressed against the upper hook 6011. At this time, the position of the power actuating plate 6 driving the transmission plate 303 is as follows: Figure 7 As shown, the guide hole 3031 on the transmission plate 303 is exactly at the higher stroke position and engages with the connecting pin 3021. Therefore, the spreading block 301 is in this position. Figure 9 In this state, the lower end of the clamping plate 2 was not opened; and immediately afterwards, the power lever 6 would continue along... Figure 6 The middle part rotates clockwise until the lower hook 6012 abuts against the locking pin 802 and stops. At this time, the transmission plate 303... Figure 8As shown, the power lever 6 is also driven to rotate clockwise, causing the lower stroke position in the guide hole 3031 to engage with the connecting pin 3021, pulling down the linkage rod 302 and causing the spreading block 301 to move downwards, thus clamping the clamping plate 2. When preparing to open the circuit breaker, the rotating shaft drives the power lever 6 to rotate counterclockwise, returning to its original position. Figure 6 The state causes the clamping mechanism to first release the clamping force, and then the power lever 6 continues to rotate counterclockwise. The upper hook 6011 continuously drives the locking pin 802 downward, causing the spring mechanism to contract. When the locking pin of the spring mechanism passes the dead point position, the spring mechanism quickly releases the stored energy, driving the connecting plate 8 and its moving contacts to quickly open the circuit breaker.

[0041] Therefore, the grounding switch of this invention can achieve secondary clamping of the moving contact through the clamping mechanism after closing, increasing the contact pressure between the moving and stationary contacts and ensuring the reliability of the connection. When opening, the clamping mechanism can first release the clamping force and then open the circuit, thus ensuring rapid opening and preventing difficulties in opening due to excessive clamping force.

[0042] Furthermore, a tab 10 is provided between the upper end of the clamping plate 2 and the moving contact 102. The tab serves two purposes: firstly, it allows the upper end of the clamping plate 2 to naturally tilt slightly outward, ensuring that the subsequent inward clamping force overcomes this tilt angle and acts relatively perpendicularly onto the moving contact (without the tab 10, the clamping force might be inclined downward); secondly, the tab 10 distributes the clamping force from the upper end of the clamping plate 2 evenly across its entire surface before acting on the moving contact 102, thus protecting the moving contact 102 to some extent and preventing excessive pressure from the clamping force directly acting on it, which could damage the surface of the moving contact.

[0043] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the design concept of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A grounding switch, comprising a frame (1), wherein a stationary contact (101), a moving contact (102), and a rotating shaft (103) are disposed on the frame (1), wherein the moving contact (102) is driven by the rotating shaft (103) to close or open with the stationary contact (101); characterized in that: The moving contact (102) is provided with a clamping mechanism; when the circuit is closed, the clamping mechanism applies a clamping force to the moving contact (102) to clamp the stationary contact (101), and when the circuit is opened, the clamping mechanism releases the clamping force it applies.

2. A grounding switch according to claim 1, characterized in that: The clamping mechanism includes clamping plates (2) on both sides and a driving component (3) located between the clamping plates (2) on both sides. The clamping plates (2) on both sides are connected by a connecting rod (4) in the middle. The upper and lower ends of the clamping plates (2) form a rocker structure with the connecting rod (4) in the middle as the fulcrum. The driving component (3) is used to open the lower end of the clamping plate (2) so that the upper end of the clamping plate (2) is clamped.

3. A grounding switch according to claim 2, characterized in that: The moving contacts (102) on both sides are provided with abutting parts (9) inside. When the circuit is opened, the driving part (3) acts on the abutting parts (9) to push the moving contacts (102) outward.

4. A grounding switch according to claim 2, characterized in that: A clamping plate (5) is provided on the outside of the connecting rod (4).

5. A grounding switch according to claim 2, characterized in that: The driving component (3) is provided with a stretching block (301) that can move up and down. When the stretching block (301) moves down or up and acts on the lower end of the clamping plate (2), the lower end of the clamping plate (2) is stretched open. When the stretching block (301) is disengaged from the lower end of the clamping plate (2), the lower end of the clamping plate (2) retracts and resets.

6. A grounding switch according to claim 5, characterized in that: The driving component (3) includes a linkage rod (302) and a transmission plate (303). The transmission plate (303) is provided with an arc-shaped guide hole (3031). The upper end of the linkage rod (302) is fixedly connected to the expansion block (301), and the lower end is provided with a connecting pin (3021). The connecting pin (3021) slides in the guide hole (3031).

7. A grounding switch according to claim 6, characterized in that: The rotating shaft (103) is provided with a power paddle (6) that rotates synchronously with it. A connecting screw (7) is provided between the power paddle (6) and the transmission plate (303) to realize the linkage between the power paddle (6) and the transmission plate (303).

8. A grounding switch according to claim 7, characterized in that: A connecting plate (8) is rotatably mounted on the rotating shaft (103). One end of the connecting plate (8) is fixedly connected to the moving contact (102), and the other end is connected to the spring mechanism through a locking pin (802). A slot (801) is provided in the connecting plate (8), and the linkage rod (302) is placed in the slot (801) and slides therein.

9. A grounding switch according to claim 8, characterized in that: The power paddle (6) is provided with a toggle groove (601), the two ends of the toggle groove (601) are used to drive the pin (802) to move, and the stroke of the two ends of the toggle groove (601) is adapted to the arc stroke of the guide hole (3031).

10. A grounding switch according to claim 2, characterized in that: A tab (10) is provided between the upper end of the clamping plate (2) and the moving contact (102).

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