A disconnecting switch electric operating mechanism with elastic limiting function

Abstract

The utility model provides a kind of isolator electric operating mechanism with elastic limiting function, it is related to isolator operating mechanism technical field, it includes box, installation frame, motor and pivot are provided in box, pivot is drivingly connected with motor, and the one end of pivot is fixed with stop after passing through installation frame, two limit posts are fixed on the installation frame, the end of limit post away from installation frame is all set with mounting hole, limit pin is slidably arranged in the mounting hole, the one end of limit pin is towards the rotation path of stop, the outside of limit pin is equipped with elastic member, after limit pin passes through the mounting hole of elastic member and limit post, it is fixed with axial limiting piece, the utility model solves the problem of component deformation, cracking caused by hard contact between blocking block and rigid limiting component in prior art.

Description

Technical Field

[0001] This utility model relates to the technical field of disconnector switch operating mechanisms, and in particular to an electric operating mechanism for a disconnector switch with an elastic limit function. Background Technology

[0002] In the fields of power engineering, electrical equipment manufacturing, and high-voltage power transmission and distribution, high-voltage AC disconnect switches are key equipment for ensuring the isolation and safe operation of the power grid. The performance of their operating mechanisms directly affects the efficiency and safety of power grid control. With the improvement of power system automation, traditional manual operating mechanisms are gradually being replaced by electric operating mechanisms due to their low efficiency and the risk of electric shock.

[0003] Existing electric operating mechanisms for disconnecting switches mostly achieve travel control through limit components. For example, Chinese utility model patent CN205911212U discloses a limit component for an electric control mechanism for opening and closing disconnecting switches. This component includes a rotating output shaft and two limit blocks. A blocking block is fixedly mounted on the rotating output shaft, and the limit block is typically a limit switch. Its working principle is as follows: the motor drives the blocking block to rotate synchronously through the output shaft. When the blocking block rotates with the rotating output shaft to the corresponding limit block position, the blocking block contacts the limit switch, triggering an electrical signal to stop the motor, thus achieving the opening and closing limit. Furthermore, existing electric operating mechanisms also have rigid limit components fixed on one side of the corresponding positions of the two limit blocks. When the rotating shaft reaches the limit angle, due to the inertia of the transmission system, the rotating output shaft will still drive the blocking block to move slightly. The hard contact between the blocking block and the rigid limit component forms a rigid limit, ensuring that the disconnecting switch accurately stops at the open / closed position.

[0004] However, the existing technology has the following obvious defects: because there will be hard contact between the blocking block and the limiting post, this hard contact will cause mechanical impact damage to the blocking block and the limiting post. Therefore, long-term use is prone to deformation and cracking of rigid limiting components, which will eventually reduce the overall service life of the operating mechanism. Utility Model Content

[0005] This application provides an electric operating mechanism for a disconnecting switch with an elastic limiting function, which solves the problem of component deformation and cracking caused by hard contact between the blocking block and the rigid limiting component in the prior art, and helps to extend the service life of the operating mechanism.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: an electric operating mechanism for a disconnecting switch with elastic limiting function, comprising a housing, a mounting bracket, a motor and a rotating shaft disposed inside the housing, the rotating shaft being drivenly connected to the motor, and one end of the rotating shaft passing through the mounting bracket and fixed with a stop, two limiting posts being fixed on the mounting bracket, each limiting post having a mounting hole at the end away from the mounting bracket, a limiting pin being slidably inserted in the mounting hole, one end of the limiting pin facing the rotation path of the stop, an elastic element being sleeved on the outside of the limiting pin, and an axial limiting element being fixed after the limiting pin passes through the elastic element and the mounting hole of the limiting post.

[0007] When the disconnecting switch performs a closing or opening action, the motor starts and drives the rotating shaft to rotate synchronously through the transmission structure. The stop rotates together with the rotating shaft until the stop rotates to the vicinity of the corresponding opening or closing limit position and contacts the end of the limit pin facing the rotation path of the stop. Since the limit pin slides through the mounting hole of the limit post and the limit pin is sleeved with an elastic element, after the stop contacts the limit pin, it will continue to push the limit pin to slide along the axis of the mounting hole. During this process, the elastic element will be squeezed and undergo elastic deformation, which plays an elastic buffering role. Therefore, it can effectively absorb the mechanical impact force between the stop and the related limit components, and avoid problems such as deformation and cracking of the limit post or stop due to hard contact after long-term use.

[0008] As a further improvement to the above solution, one end of the limiting pin is provided with an annular boss, and the outer diameter of the boss is larger than the diameter of the mounting hole on the limiting post. The elastic element is sleeved on the limiting pin and located between the boss and the limiting post. The boss can axially limit the elastic element and prevent the elastic element from falling off from the end of the limiting pin near the stop during the sliding process of the limiting pin.

[0009] As a further improvement to the above solution, a sleeve is fixed to one end of the limiting post away from the boss of the limiting pin. The axis of the sleeve is collinear with the axis of the mounting hole on the limiting post. The end of the limiting pin away from the stop passes through the mounting hole of the limiting post and the sleeve in sequence and is fixed to the axial limiting component. The inner wall of the sleeve can form a radial constraint on the outer peripheral wall of the limiting pin, thereby avoiding the deviation and tilting of the limiting pin due to force.

[0010] As a further improvement to the above solution, the axial limiting component is a cotter pin; the cotter pin can achieve axial limiting of the limiting pin, and is convenient to install and disassemble, and has low cost.

[0011] As a further improvement to the above solution, the outer peripheral wall of the end of the limiting pin away from the stop is machined with external threads, and the axial limiting component is a nut, which forms a threaded engagement with the external threads on the limiting pin; the axial fixation of the limiting pin can be achieved by the nut.

[0012] As a further improvement to the above solution, stiffening plates are provided on both sides of the limiting post. One side of the stiffening plate is fixedly connected to the limiting post, and the other side of the stiffening plate is fixedly connected to the mounting frame. Thus, the stiffening plates can enhance the connection strength between the limiting post and the mounting frame, and prevent the limiting post from tilting or breaking when subjected to the impact force of the stop.

[0013] As a further improvement to the above solution, the elastic element is a butterfly spring; a butterfly spring can absorb a large impact force within a small compression stroke.

[0014] As a further improvement to the above solution, the elastic element is a helical spring.

[0015] As can be seen from the above technical solutions, this utility model has at least the following technical effects or advantages: When the disconnecting switch performs a closing or opening action, the motor starts and drives the rotating shaft to rotate synchronously through the transmission structure. The stop rotates together with the rotating shaft until the stop rotates to the vicinity of the corresponding opening or closing limit position and contacts the end of the limit pin facing the rotation path of the stop. Since the limit pin slides through the mounting hole of the limit post and the limit pin is sleeved with an elastic element, after the stop contacts the limit pin, it will continue to push the limit pin to slide along the axis of the mounting hole. During this process, the elastic element will be squeezed and undergo elastic deformation, which plays an elastic buffering role. Therefore, it can effectively absorb the mechanical impact force between the stop and the related limit components, and avoid problems such as deformation and cracking of the limit post or stop due to hard contact after long-term use. Attached Figure Description

[0016] To more clearly illustrate the technical solution of this utility model, the accompanying drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the assembly of the limit pin, elastic element, and limit post on the mounting bracket. Figure 3 This is a schematic diagram of the assembly between the limiting pin, the elastic element, and the limiting post.

[0017] Explanation of reference numerals in the attached drawings: 1. Housing, 2. Mounting bracket, 3. Motor, 4. Shaft, 5. Stop, 6. Limiting post, 7. Limiting pin, 8. Elastic element, 9. Boss, 10. Sleeve, 11. Axial limiting element. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, other embodiments obtained by those skilled in the art without creative effort are all within the scope of protection of this patent.

[0019] This utility model discloses an electric operating mechanism for a disconnector switch with an elastic limiting function, such as... Figure 1 , Figure 2 As shown, it includes a housing 1, inside which a mounting frame 2 is fixedly installed. The mounting frame 2 is fixedly connected to the inner wall of the housing 1 by bolts to support components such as the motor 3 and the rotating shaft 4. The motor 3 is fixed to one side of the mounting frame 2 by bolts, and the output end of the motor 3 is connected to the rotating shaft 4 by transmission (the transmission method can be gear transmission or direct connection by coupling; since the transmission connection structure between the motor and the rotating shaft 4 is existing technology, it will not be described in detail in this embodiment). One end of the rotating shaft 4 passes through a pre-set through hole on the mounting frame 2 and is fixed to a stop 5 by key connection or welding. The stop 5 is a block structure extending radially along the rotating shaft 4 and can rotate synchronously with the rotating shaft 4. The mounting frame 2 also has two limit posts 6, which correspond to the closing limit position and the opening limit position of the disconnecting switch, respectively, and are symmetrically distributed along the rotation trajectory of the stop 5. Specifically, one end of the limiting pin 6 is welded and fixed to the mounting bracket 2, and the other end has a mounting hole along the axial direction. This mounting hole is a through hole, and its inner diameter is adapted to the outer diameter of the limiting pin 7. The limiting pin 7 is slidably inserted into the mounting hole. The limiting pin 7 is a cylindrical rod, and one end of the limiting pin 7 faces the rotation path of the stop 5 to ensure that the stop 5 can contact this end when it rotates. An elastic element 8 is sleeved on the outside of the limiting pin 7. After the end of the limiting pin 7 away from the stop 5 passes through the elastic element 8 and the mounting hole of the limiting pin 6 in sequence, it is axially limited by the axial limiting element 11 to prevent the limiting pin 7 from falling out of the mounting hole.

[0020] Specifically, such as Figure 3 As shown, the end of the limiting pin 7 near the stop 5 has an integrally formed annular boss 9. The outer diameter of the boss 9 is larger than the diameter of the mounting hole on the limiting post 6, thereby limiting the elastic element 8 in its axial direction. The elastic element 8 is sleeved on the limiting pin 7, and both ends of the elastic element 8 abut against the end face of the boss 9 and the end face of the limiting post 6, respectively, that is, the elastic element 8 is located between the boss 9 and the limiting post 6. When the stop 5 contacts the boss 9 and pushes the limiting pin 7, the boss 9 can directly squeeze the elastic element 8, causing the elastic element 8 to undergo elastic deformation, thereby playing a buffering role.

[0021] More specifically, such as Figure 2 , Figure 3 As shown, a sleeve 10 is welded and fixed to one end of the limiting post 6 away from the boss 9 of the limiting pin 7. The sleeve 10 is a cylindrical tubular structure, and its inner diameter is consistent with the inner diameter of the mounting hole on the limiting post 6. The axis of the sleeve 10 is collinear with the axis of the mounting hole on the limiting post 6, so that the limiting pin 7 can slide along the same axis. The end of the limiting pin 7 away from the stop 5 passes through the mounting hole of the limiting post 6 and the sleeve 10 in sequence, and is fixedly connected to the axial limiting member 11. During the sliding process of the limiting pin 7, the inner wall of the sleeve can constrain the radial displacement of the limiting pin 7, preventing the limiting pin 7 from radially offset or tilting, thereby ensuring that the limiting pin 7 can slide along the preset axial direction.

[0022] In addition, ribs are symmetrically arranged on both sides of the limiting post 6. The ribs can be triangular metal plates, with one side welded to the outer peripheral wall of the limiting post 6 and the other side welded to the surface of the mounting frame 2. The ribs can enhance the connection strength between the limiting post 6 and the mounting frame 2, preventing the limiting post 6 from tilting or breaking when subjected to the impact force of the stop 5, which is especially suitable for high torque scenarios.

[0023] There are two embodiments regarding the specific arrangement of the axial limiting member 11. In one embodiment, as shown... Figure 3 As shown, the axial limiting member 11 is a cotter pin. Correspondingly, the end of the limiting pin 7 away from the stop 5 has a pin hole adapted to the cotter pin. After the cotter pin passes through the pin hole, its two ends are bent outwards respectively, thereby achieving axial limiting of the limiting pin 7. The advantage of this structure is that it is easy to install and disassemble and has low cost. In another embodiment, the outer peripheral wall of the end of the limiting pin 7 away from the stop 5 is machined with external threads, and the axial limiting member 11 is a nut. The nut and the external threads on the limiting pin 7 form a threaded engagement. By tightening the nut, the end face of the nut abuts against the end face of the sleeve 10, thereby achieving axial fixation of the limiting pin 7. If it is necessary to adjust the preload of the elastic member 8, the extension length of the limiting pin 7 can be changed by rotating the nut, which provides greater flexibility.

[0024] Regarding the specific selection of the elastic element 8, there are two embodiments. In one embodiment, the elastic element 8 is a disc spring. Disc springs have the characteristics of high stiffness, good buffering and energy absorption effect, and small space occupation, and can absorb a large impact force within a small compression stroke. In other embodiments, the elastic element 8 is a helical spring. Helical springs have the advantages of low cost, easy processing, convenient procurement, and no special tools are required for maintenance and replacement.

[0025] The working principle of this operating mechanism is as follows: In actual operation, when the disconnecting switch needs to be closed, motor 3 starts, driving shaft 4 to rotate clockwise through the transmission structure. Stop 5 rotates clockwise synchronously with shaft 4. When stop 5 rotates to the limit pin 7 near the closing side, the side of stop 5 contacts the boss 9 of limit pin 7 and continues to push boss 9 away from stop 5. At this time, boss 9 compresses elastic element 8, causing elastic deformation and converting hard contact into elastic contact, buffering the impact force between stop 5 and limit pin 7. When stop 5 rotates to the closing limit position, an electrical limit trigger signal is issued, and motor 3 stops running. Due to the inertia of the transmission system, stop 5 may continue to rotate slightly. The continuous compression of elastic element 8 can further absorb the inertial impact force, preventing mechanical damage to stop 5, limit pin 7, and limit post 6.

[0026] When the disconnecting switch needs to be opened, the motor 3 starts in reverse, driving the rotating shaft 4 to rotate counterclockwise. The stop 5 rotates counterclockwise synchronously with the rotating shaft 4. Its movement process is the same as when it is closed: the stop 5 contacts the boss 9 of the limit pin 7 on the opening side, pushing the limit pin 7 to slide and compress the elastic element 8. The elastic element 8 buffers the impact force until the electrical limit triggers the motor 3 to stop, completing the opening action.

[0027] In the description of this utility model, the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for describing this utility model and do not require that this utility model be constructed or operated in a specific orientation, and therefore should not be construed as limiting this utility model. The terms "connected" and "linked" in this utility model should be interpreted broadly. For example, they can refer to a connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0028] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in its embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novelty disclosed herein.

Claims

1. An electric operating mechanism for a disconnecting switch with elastic limit function, comprising a housing (1), wherein a mounting bracket (2), a motor (3), and a rotating shaft (4) are disposed inside the housing (1), the rotating shaft (4) is connected to the motor (3) for transmission, and one end of the rotating shaft (4) passes through the mounting bracket (2) and is fixed with a stop (5), characterized in that, Two limiting posts (6) are fixed on the mounting bracket (2). Each limiting post (6) has a mounting hole at the end away from the mounting bracket (2). A limiting pin (7) slides through the mounting hole. One end of the limiting pin (7) faces the rotation path of the stop (5). An elastic element (8) is sleeved on the outside of the limiting pin (7). After the limiting pin (7) passes through the elastic element (8) and the mounting hole of the limiting post (6), an axial limiting element (11) is fixed.

2. The electrically operated mechanism for a disconnector switch with elastic limiting function according to claim 1, characterized in that, One end of the limiting pin (7) is provided with an annular boss (9), and the outer diameter of the boss (9) is larger than the diameter of the mounting hole on the limiting post (6). The elastic element (8) is sleeved on the limiting pin (7) and located between the boss (9) and the limiting post (6).

3. The electrically operated mechanism for a disconnector switch with elastic limiting function according to claim 2, characterized in that, The end of the limiting post (6) away from the boss (9) of the limiting pin (7) is fixed with a sleeve (10). The axis of the sleeve (10) is collinear with the axis of the mounting hole on the limiting post (6). The end of the limiting pin (7) away from the stop (5) passes through the mounting hole of the limiting post (6) and the sleeve (10) in sequence and is fixed with the axial limiting member (11).

4. The electrically operated mechanism for a disconnector switch with elastic limiting function according to claim 3, characterized in that, The axial limiting component (11) is a cotter pin.

5. The electrically operated mechanism for a disconnector switch with elastic limit function according to claim 3, characterized in that, The outer peripheral wall of the end of the limiting pin (7) away from the stop (5) is machined with external threads, and the axial limiting member (11) is a nut, which forms a threaded fit with the external threads on the limiting pin (7).

6. The electrically operated mechanism for a disconnector switch with elastic limit function according to claim 1, characterized in that, The limiting post (6) is provided with stiffening plates on both sides. One side of the stiffening plate is fixedly connected to the limiting post (6), and the other side of the stiffening plate is fixedly connected to the mounting frame (2).

7. An electric operating mechanism for a disconnector switch with elastic limiting function according to any one of claims 1 to 6, characterized in that, The elastic element (8) is a butterfly spring.

8. An electric operating mechanism for a disconnector switch with elastic limiting function according to any one of claims 1 to 6, characterized in that, The elastic element (8) is a helical spring.

Images