Operating mechanism of dual-power change-over switch
By setting limiting parts in the operating mechanism of the dual power conversion switch to limit the rotation stroke of the transmission plate, the problem of the handle continuing to move after closing is solved, the stress is reduced, and the service life is improved.
Patent Information
- Application Number
- CN202420691318.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-07
- Publication Date
- 2025-04-22
- Estimated Expiration
- 2034-04-07
AI Technical Summary
Due to the introduction of excitation drive of the existing dual power switch, the operating mechanism of the circuit breaker handle continues to move after the closing position, exceeding the allowable limit position, resulting in increased stress and affecting service life.
A limit member is provided in the operating mechanism to limit the rotational stroke of the transmission plate, prevent the handle from continuing to be driven by the transmission plate after closing, and avoid exceeding the limit position.
By setting the limiting member, the stress on the circuit breaker handle after closing is reduced, damage caused by excessive movement is avoided, and service life is improved.
Smart Images
Figure CN222785240U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of low-voltage electrical appliances, and in particular relates to an operating mechanism of a dual-power supply conversion switch. Background Art
[0002] Dual power transfer switches are used in power supply systems. When one power source fails, it can prevent the failed power source from supplying power to the load, and reliably select another power source to be put into operation to ensure the continuity of power supply. Dual power transfer switches are generally used in more important places, such as hospitals, airports, docks, banks, etc.
[0003] The dual power conversion switch uses a molded case circuit breaker as an actuator. Its operating mechanism is equipped with a rotating transmission plate. The operating mechanism drives the circuit breaker to close and open through the transmission plate. In order to ensure that the circuit breaker is closed in place, the movement stroke of the transmission plate should ensure that the circuit breaker handle can reach the closed position. The current dual power conversion switch introduces excitation drive. The direct-acting moving iron core has high energy and fast movement speed, which greatly improves the conversion speed, but brings new problems: when the circuit breaker reaches the closed position, due to the large residual energy of the electromagnetic drive, the transmission plate will continue to drive the handle to move under the influence of the residual energy, and even exceed the limit position of the handle allowed by the internal operating mechanism of the circuit breaker. When the handle moves to the limit position, the stress it is subjected to suddenly increases, and it is very easy to be damaged, affecting its service life.
[0004] In view of the above-mentioned prior art, it is necessary to reasonably improve the operating mechanism structure of the existing dual power conversion switch. To this end, the applicant has made a useful design, and the technical solution to be introduced below is produced under this background. Utility Model Content
[0005] The utility model aims to provide an operating mechanism of a dual power conversion switch, which reduces the stress on a circuit breaker handle and increases its service life by limiting the rotational travel of a transmission plate through a limiting member.
[0006] The object of the utility model is achieved in this way. An operating mechanism of a dual power conversion switch includes a bracket, a turntable and a transmission plate. The turntable is rotatably arranged on the bracket. The transmission plate is rotatably arranged on the bracket at a position between the execution switch of the dual power conversion switch and the turntable. The turntable drives the transmission plate to rotate when it rotates forward and reversely, and the execution switch is driven by the transmission plate to close and open. The operating mechanism also includes a limit member, which is arranged on the bracket and is used to limit the maximum rotation stroke when the transmission plate drives the execution switch to close, so as to prevent the handle from continuing to be driven by the transmission plate and moving after it is in place when the execution switch is closed.
[0007] In a specific embodiment of the present invention, one end of the transmission plate facing the execution switch is configured as a driving portion, and a handle driving groove is formed on the driving portion and is open toward the execution switch, and the handle of the execution switch is accommodated in the handle driving groove; one end of the transmission plate facing the turntable is configured as a driven portion, and a turntable driven groove is formed on the driven portion and is open toward the turntable, and the turntable driven groove cooperates with the driving shaft on the turntable.
[0008] In another specific embodiment of the present invention, the transmission plate forms a limit fitting surface on the lower side contour surface close to one end of the driven groove of the turntable, and the maximum rotation stroke of the transmission plate is limited by the contact between the limit member and the limit fitting surface.
[0009] In another specific embodiment of the present invention, the limiting member is a shaft fixed on the bracket.
[0010] In yet another specific embodiment of the present utility model, the limiting member is a protrusion formed by bending the bracket toward the transmission plate.
[0011] In another specific embodiment of the present invention, an electromagnetic driving device is further included, and the electromagnetic driving device drives the turntable to rotate forward and reverse.
[0012] Since the utility model adds a limit member, compared with the prior art, the utility model has the beneficial effect that the limit member can limit the extreme position of the rotation stroke when the transmission plate drives the execution switch to close the switch, so as to prevent the handle of the execution switch from continuing to be driven by the transmission plate to move after reaching the closing position, thereby reducing the stress on the handle and increasing its service life. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a schematic diagram of the cooperation between the operating mechanism and the execution switch of the utility model;
[0014] Figure 2 A schematic diagram of the cooperation between the bracket and the transmission plate of the utility model;
[0015] Figure 3 It is a side view of the handle of the utility model when it is in the extreme position;
[0016] Figure 4 It is a side view of the handle of the utility model when it is in the closing position;
[0017] Figure 5 This is a side view of the handle of the utility model when it is in the open position.
[0018] In the figure: 1. bracket; 2. turntable, 21. driving shaft; 3. transmission plate, 31. driving part, 311. handle driving groove, 32. driven part, 321. turntable driven groove, 33. positioning shaft, 34. bushing, 35. limiting mating surface; 4. execution switch, 41. handle; 5. limiting member; 6. electromagnetic driving device; 7. bottom plate; 8. positioning spring. DETAILED DESCRIPTION
[0019] The specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings, but the description of the embodiments is not a limitation of the technical solution. Any changes in form rather than substance based on the concept of the present invention should be regarded as the protection scope of the present invention.
[0020] In the following description, all concepts related to directionality (or orientation) such as up, down, left, right, front and back are referring to the position state of the figure being described, and are intended to facilitate public understanding. Therefore, they should not be understood as special limitations on the technical solutions provided by the present utility model.
[0021] The utility model relates to an operating mechanism of a dual power conversion switch, the dual power conversion switch comprising a bottom plate 7 and an execution switch 4. Figure 1 As shown, the operating mechanism is fixed on the base plate 7, and the executive switch 4 is a pair of molded case circuit breakers fixed on the base plate 7 and arranged on both sides of the operating mechanism, wherein one executive switch 4 is used to control the connection and disconnection of the first power supply, and the other executive switch 4 is used to control the connection and disconnection of the second power supply.
[0022] The operating mechanism includes a bracket 1, a turntable 2, a transmission plate 3 and an electromagnetic drive device 6. The bracket 1 is fixed on a bottom plate 7, and the turntable 2 is rotatably disposed on the bracket 1. The transmission plate 3 is rotatably disposed on the bracket 1 at a position between the execution switch 4 and the turntable 2 through a positioning shaft 33 and a shaft sleeve 34. The end of the transmission plate 3 facing the execution switch 4 cooperates with the execution switch 4, and the end facing the turntable 2 cooperates with the turntable 2. Specifically, one end of the transmission plate 3 facing the execution switch 4 is constituted as a driving part 31, and a handle driving groove 311 is formed on the driving part 31 and is open to the execution switch 4, and the handle 41 of the execution switch 4 is accommodated in the handle driving groove 311; one end of the transmission plate 3 facing the turntable 2 is constituted as a driven part 32, and a turntable driven groove 321 is formed on the driven part 32 and is open to the turntable 2, and the turntable driven groove 321 cooperates with the drive shaft 21 on the turntable 2, and the groove wall of the turntable driven groove 321 will be pushed by the drive shaft 21 on the turntable 2. The driving part 31 and the driven part 32 are respectively arranged on both sides of the positioning shaft 33. The electromagnetic driving device 6 includes a moving and static iron core, and when the moving iron core is energized and attracted, the moving iron core drives the turntable 2 to rotate forward and reverse, and the forward and reverse rotation of the turntable 2 drives the execution switch 4 to close and open through the transmission plate 3.
[0023] The key point of the improvement of the utility model is that a limit member 5 is provided on the bracket 1 to limit the maximum rotation stroke when the transmission plate 3 drives the execution switch 4 to close, so as to prevent the handle 41 from continuing to be driven by the transmission plate 3 and moving after it is in place when the execution switch 4 is closed.
[0024] In this embodiment, the stopper 5 is a shaft fixed to the bracket 1. The shaft can be riveted or welded to the bracket 1, or a thread can be formed on the outer circumferential surface of the bottom of the shaft, and the thread can be matched with the threaded hole on the bracket 1 to achieve fixation. Of course, the stopper 5 is not limited to the preferred embodiment given in this embodiment, and the stopper 5 can also be a protrusion formed by bending the bracket 1 toward the transmission plate 3.
[0025] like Figure 1 , Figure 2 As shown, the transmission plate 3 forms a limit fitting surface 35 on the lower side contour surface close to one end of the rotating disk driven groove 321, and the maximum rotation stroke of the transmission plate 3 is limited by the contact between the limit member 5 and the limit fitting surface 35.
[0026] Furthermore, the handle 41 has the following features: Figure 4 The closing position reached when the execution switch 4 is closed is shown in FIG. Figure 5The shown opening position is reached when the actuator switch 4 is opened. In the closed position, the distance between the lower wall of the handle 41 and the top of the handle panel protrusion is L2, and in the open position, the distance between the lower wall of the handle 41 and the top of the handle panel protrusion is L3. The handle 41 can move between the above two positions under the drive of the transmission plate 3. If the handle 41 is driven in the closing direction by an external force other than the circuit breaker and further moves to the closed position after reaching the closed position Figure 3 The limit position shown in the figure, at this position, the distance between the lower wall of the handle 41 and the top of the handle panel protrusion is L1, L1 is smaller than L2 and L3, and the difference between L2 and L1 is the small margin of the handle 41 movement allowed by the internal mechanism of the circuit breaker after the handle 41 exceeds the closing position in the closing direction. When the handle 41 is in the limit position, due to the limitation of the internal mechanism of the circuit breaker, the handle 41 cannot move further, and the stress on the handle 41 increases suddenly, so fatigue damage is prone to occur during the operation, thereby affecting the service life. In view of this problem, in the process of driving the handle 41 by the transmission plate 3 to close the switch, the maximum rotation stroke of the transmission plate 3 must be limited to prevent the transmission plate 3 from driving the handle 41 to reach the limit position of the handle 41, that is, after the handle 41 reaches the closing position when the switch 4 is closed, the transmission plate 3 should be prohibited from further driving the handle 41.
[0027] See you next time Figure 1 , the actuator switch 4 on the left is in the open state, and its handle 41 is in the open position. When the turntable 2 rotates counterclockwise, the transmission plate 3 on the left rotates clockwise under the drive of the turntable 2. During this process, the driving part 311 of the transmission plate 3 on the left contacts the handle 41 of the actuator switch 4 on the left, and the handle 41 moves from the open position to the closed position. When the handle 41 reaches the closed position, due to inertia, the transmission plate 3 on the left continues to rotate clockwise until its limit mating surface 35 contacts the limit member 5 on the bracket 1 and stops. In the above process, the handle 41 moves from the closed position to the extreme position, but does not reach the extreme position. Therefore, the stress on the handle 41 is small, which can increase the service life.
[0028] In the above structure, generally, after the handle 41 moves past the dead point of the operating mechanism, the spring of the operating mechanism inside the circuit breaker will drive the handle 41 to reach the closed position, that is, the driving force of the transmission plate 3 on the handle 41 only needs to ensure that the handle 41 can pass the dead point of the operating mechanism inside the circuit breaker. Therefore, when the handle 41 moves past the dead point of the operating mechanism inside the circuit breaker, the transmission chain of the moving iron core, the rotating disk 2 and the transmission plate 3 of the electromagnetic drive device 6 can be disconnected. However, even if it is disconnected, the transmission plate 3 still has a rotational inertia. Figure 1The transmission plate 3 on the upper left side continues to rotate until its limit matching surface 35 contacts the limit piece 5 on the bracket 1 and then stops. The limit piece 5 limits the maximum rotation stroke when the transmission plate 3 drives the execution switch 4 to close. However, this is not the position where the transmission plate 3 finally stops. Since the distance between the upper and lower groove walls of the handle driving groove 311 is greater than the thickness of the handle 41, there may be a state where the upper and lower groove walls of the handle driving groove 311 are not in contact with the upper wall and the lower wall of the handle 41. Furthermore, a positioning spring 8 is provided between the bracket 1 and the transmission plate 3. The positioning spring 8 acts on the end of the transmission plate 3 close to the turntable 2, so that the transmission plate 3 finally stops. At this time, the lower wall of the handle driving groove 311 of the transmission plate 3 abuts against the lower wall of the handle 41.
[0029] In the above preferred embodiments, Figure 1 The stopper 5 is arranged below the transmission plate 3 and close to the turntable 2, so the stopper mating surface 35 in contact with the stopper 5 is on the lower contour surface of the transmission plate 3 close to the end of the turntable driven groove 321. Of course, the arrangement of the stopper 5 is not limited to the above position. If the size of the bracket 1 is sufficient, the stopper 5 can also be arranged above the transmission plate 3 (see Figure 1 In the viewing direction) and close to the handle 41 of the execution switch 4, at this time, the limiting matching surface 35 contacting the limiting member 5 is formed on the upper side contour surface of the transmission plate 3 close to one end of the handle driving groove 311.
Claims
1. An operating mechanism for a dual power switch, characterized in that: The invention comprises a support (1), a rotating disk (2) and a transmission plate (3), wherein the rotating disk (2) is rotatably arranged on the support (1), and the transmission plate (3) is rotatably arranged on the support (1) at a position between an execution switch (4) of a dual power conversion switch and the rotating disk (2), and the rotating disk (2) drives the transmission plate (3) to rotate when rotating forward or reverse, and the transmission plate (3) drives the execution switch (4) to close or open. The invention is characterized in that: the operating mechanism further comprises a limiting member (5), and the limiting member (5) is arranged on the support (1) and is used to limit the maximum rotation stroke when the transmission plate (3) drives the execution switch (4) to close, so as to prevent the handle (41) from continuing to be driven by the transmission plate (3) to move after it is in place when the execution switch (4) is closed.
2. The operating mechanism of a dual power conversion switch according to claim 1, characterized in that: The end of the transmission plate (3) facing the execution switch (4) is configured as a driving portion (31), and a handle driving groove (311) opening toward the execution switch (4) is formed on the driving portion (31), and the handle (41) of the execution switch (4) is accommodated in the handle driving groove (311); the end of the transmission plate (3) facing the turntable (2) is configured as a driven portion (32), and a turntable driven groove (321) opening toward the turntable (2) is formed on the driven portion (32), and the turntable driven groove (321) cooperates with the driving shaft (21) on the turntable (2).
3. The operating mechanism of a dual power conversion switch according to claim 2 is characterized in that: The transmission plate (3) forms a limit matching surface (35) on the lower side contour surface close to one end of the rotating disk driven groove (321), and the maximum rotation stroke of the transmission plate (3) is limited by the contact between the limit member (5) and the limit matching surface (35).
4. The operating mechanism of a dual power conversion switch according to claim 1, characterized in that: The limiting member (5) is a shaft fixed on the bracket (1).
5. The operating mechanism of a dual power conversion switch according to claim 1, characterized in that: The limiting member (5) is a protrusion formed by bending the bracket (1) in the direction of the transmission plate (3).
6. The operating mechanism of a dual power conversion switch according to claim 1, characterized in that: It also comprises an electromagnetic driving device (6), wherein the electromagnetic driving device (6) drives the turntable (2) to rotate forward and reverse.