Operating mechanism of isolating switch and circuit breaker

Abstract

The utility model discloses an operating mechanism of an isolating switch and a circuit breaker, and relates to the field of electrical switchs.The operating mechanism of the isolating switch comprises an isolating rotating shaft, a connecting crank arm and an elastic force keeping assembly, and the elastic force keeping assembly is used for keeping the isolating rotating shaft in a closing or opening state; the connecting crank arm is rotatably connected with the isolation rotating shaft, the isolation rotating shaft is provided with a limiting piece, the limiting piece is used for limiting the relative rotation angle of the connecting crank arm relative to the isolation rotating shaft, and the rotation angle range between the connecting crank arm and the isolation rotating shaft is smaller than the rotation angle range of the isolation rotating shaft. According to the invention, the opening and closing switching process of the isolation switch is more labor-saving.

Description

Technical Field

[0001] The present application relates to the field of electrical switches, and in particular to an operating mechanism of an isolating switch and a circuit breaker. Background Art

[0002] Disconnectors and circuit breakers usually work together to control the circuit. Since disconnectors do not have arc extinguishing function, it is necessary to control the closing and opening sequence between the circuit breaker and the disconnector. Some vacuum circuit breakers have built-in disconnectors, which are mainly switched on and off manually.

[0003] In the prior art, the isolating switch built into the circuit breaker mainly includes an isolating shaft, a connecting crank arm and an elastic retaining assembly. The connecting crank arm is installed on the isolating shaft. The isolating shaft is rotated back and forth to realize the switching of the closing and opening states of the isolating switch. The elastic force of the elastic retaining assembly can hinder the process of the isolating shaft switching on and off, so that the isolating shaft can be stably maintained in the closed or open state.

[0004] Since the friction between the moving and static contacts and the elastic force of the elastic force holding component need to be overcome during the switching of the isolating switch to the closing and opening state, the state switching of the isolating switch is relatively laborious and inconvenient to operate. Utility Model Content

[0005] In order to reduce the problem of excessive effort in the process of switching on and off the isolating switch, the present application provides an operating mechanism and a circuit breaker of the isolating switch.

[0006] The operating mechanism of the isolating switch and the circuit breaker provided in the present application adopt the following technical solutions:

[0007] An operating mechanism of an isolating switch comprises an isolating shaft, a connecting crank arm and an elastic retaining assembly, wherein the elastic retaining assembly is used to keep the isolating shaft in a closed or open state, the connecting crank arm is rotatably connected to the isolating shaft, the isolating shaft is provided with a limiter, the limiter is used to limit the relative rotation angle of the connecting crank arm relative to the isolating shaft, and the rotation angle range between the connecting crank arm and the isolating shaft is smaller than the rotation angle range of the isolating shaft.

[0008] By adopting the above technical solution, in the process of rotating the isolation shaft to switch the closing and opening states of the isolation switch, the elastic force holding component passes through the maximum elastic deformation state. In the initial stage of the rotation of the isolation shaft, the isolation shaft and the connecting crank arm rotate relative to each other. At this time, the isolation shaft does not drive the connecting crank arm to rotate. When the rotation angle of the isolation shaft is greater than or equal to the relative rotation angle of the connecting crank arm and the isolation shaft limited by the limiter, the isolation shaft can drive the connecting crank arm to rotate through the limiter, and after the isolation shaft passes through the maximum elastic deformation state of the elastic force holding component, the elastic force holding component releases elastic potential energy outward, so that the elastic force holding component can drive the connecting crank arm to rotate. In the above process, the isolation shaft does not need to drive the connecting crank arm within a certain rotation stroke, which is conducive to reducing the total load during the operation of the isolation switch, making the operation of the isolation switch more labor-saving and convenient.

[0009] Optionally, the connecting crank arm is provided with a rotating connecting sleeve, and the connecting crank arm is rotatably connected to the isolation shaft through the rotating connecting sleeve; the limiting member is a columnar structure, the limiting member is vertically fixed to the isolation shaft, and the peripheral wall of the rotating connecting sleeve is provided with a rotating limiting groove for avoiding the limiting member.

[0010] By adopting the above technical solution, when the connecting crank arm rotates around the isolation shaft, the limiting member will abut against the inner wall of the limiting groove, so that the relative rotation between the connecting crank arm and the isolation shaft is limited.

[0011] Optionally, the limiting member passes through the isolation shaft, and two rotation limiting grooves are provided, and the two rotation limiting grooves correspond to two ends of the limiting member respectively.

[0012] By adopting the above technical solution, the limiting member passes through the isolation shaft, so that there is a larger matching size between the limiting member and the isolation shaft, which is beneficial to increasing the stability of the installation state of the limiting member.

[0013] Optionally, the connecting crank arm is provided with a rotating connecting sleeve, and the connecting crank arm is rotatably connected to the isolation shaft through the rotating connecting sleeve; the limiting member is a columnar structure, the limiting member is vertically fixed to the isolation shaft, and the surrounding wall of the rotating connecting sleeve is provided with a limiting notch for avoiding the limiting member.

[0014] By adopting the above technical solution, when the connecting crank arm rotates around the isolation shaft, the limiting member will abut the inner edge of the limiting notch, so that the relative rotation between the connecting crank arm and the isolation shaft is limited.

[0015] Optionally, two limiting notches are provided, and the two limiting notches are respectively located at two ends of the rotating connecting sleeve; and the limiting members correspond to the two limiting notches respectively.

[0016] By adopting the above technical solution, in the case of setting two limiters, when one of the limiters fails to limit, the other limiter can continue to play a limiting role, which is conducive to ensuring the reliability of the disconnector. The two limiters correspond to the notches at both ends of the rotation limit sleeve, so that the two limiters can limit the axial position of the rotation connection sleeve on the isolation shaft.

[0017] Optionally, the two limiting notches are located on both sides of the center line of the rotating connecting sleeve.

[0018] By adopting the above technical solution, the two limiting notches are respectively located on both sides of the center line of the rotating connecting sleeve, which can reduce the weakening effect of the limiting notches on the structural strength of the rotating connecting sleeve.

[0019] Optionally, the limiting member is a pin shaft, and the pin shaft is provided with a longitudinal section, and the longitudinal section abuts against the inner edge of the limiting notch.

[0020] By adopting the above technical solution, the pin abuts against the inner edge of the limiting notch with its longitudinal section, so that the pin is not easy to rotate around its own axis, which is beneficial to reduce the situation where the pin falls off the isolation shaft.

[0021] Optionally, the relative rotational travel between the connecting crank arm (2) and the limiting member (4) has a first limit travel point (51) and a second limit travel point (52); when the limiting member (4) moves from the first limit travel point (51) to the second limit travel point (52), the isolation shaft (1) and the connecting crank arm (2) rotate relative to each other, and when the limiting member (4) is located at the second limit travel point (52), the elastic force retaining component (3) is in a maximum elastic deformation state.

[0022] By adopting the above technical solution, in the process of the limit member moving from the first extreme travel point to the second travel point, the isolating shaft rotates and switches from the open state to the closed state. When the limit member is located at the second extreme travel point, the isolating shaft begins to drive the connecting crank arm. As the isolating shaft continues to rotate, the elastic retaining assembly begins to release elastic potential energy, so that the elastic force of the elastic retaining assembly offsets part of the friction force between the static contacts, so that the elastic force of the elastic retaining assembly can be utilized as soon as possible.

[0023] Optionally, the relative rotational travel between the connecting crank arm (2) and the limiting member (4) has a first limit travel point (51) and a second limit travel point (52); when the limiting member (4) moves from the second limit travel point (52) to the first limit travel point (51), the isolation shaft (1) and the connecting crank arm (2) rotate relative to each other, and when the limiting member (4) is located at the first limit travel point (51), the elastic force retaining component (3) is in a maximum elastic deformation state.

[0024] By adopting the above technical solution, in the process of the limit member moving from the second extreme travel point to the first travel point, the isolating shaft rotates and switches from the closed state to the open state. When the limit member is located at the first extreme travel point, the isolating shaft begins to drive the connecting crank arm. As the isolating shaft continues to rotate, the elastic retaining assembly begins to release elastic potential energy, so that the elastic force of the elastic retaining assembly offsets part of the friction force between the static contacts, so that the elastic force of the elastic retaining assembly can be utilized as soon as possible.

[0025] A circuit breaker comprises an operating mechanism of any one of the above-mentioned isolating switches.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. In the initial stage of the rotation of the isolation shaft, the isolation shaft and the connecting crank arm rotate relative to each other. At this time, the isolation shaft does not drive the connecting crank arm to rotate. When the rotation angle of the isolation shaft is greater than or equal to the relative rotation angle of the connecting crank arm and the isolation shaft limited by the limiter, the isolation shaft can drive the connecting crank arm to rotate through the limiter. The isolation shaft does not need to drive the connecting crank arm within a certain rotation stroke, which is conducive to reducing the total load during the operation of the isolation switch, making the operation of the isolation switch more labor-saving and convenient.

[0028] 2. The limiting member passes through the isolation shaft, so that there is a larger matching dimension between the limiting member and the isolation shaft, which is beneficial to increasing the stability of the installation state of the limiting member. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the operating mechanism of the isolating switch of Example 1.

[0030] Figure 2 It is a schematic diagram of the isolating shaft of Example 1 in the disconnecting state of the isolating switch.

[0031] Figure 3 It is a schematic diagram of the isolation shaft of Example 1 rotating to the state where the limiting member is at the second limit travel point.

[0032] Figure 4 It is a schematic diagram of the isolating shaft of Example 2 when the isolating switch is in the closed state.

[0033] Figure 5 It is a structural schematic diagram of the operating mechanism of the isolating switch of Example 2.

[0034] Figure 6 yes Figure 5 Partial cross-sectional view at AA in the middle.

[0035] Figure 7 It is a structural schematic diagram of the operating mechanism of the isolating switch of Example 3.

[0036] Description of reference numerals:

[0037] 1. Isolation shaft; 11. Pin hole; 2. Connecting crank arm; 21. Rotating connecting sleeve; 211. Rotating limit groove; 212. Limiting notch; 213. Avoiding notch; 214. Protruding structure; 3. Elastic force retaining assembly; 31. Telescopic rod; 311. Limiting structure; 32. Compression spring; 33. Articulated connecting rod; 4. Limiting member; 41. Flat head pin; 42. Pin shaft; 421. Longitudinal section; 51. First limit travel point; 52. Second limit travel point. DETAILED DESCRIPTION

[0038] The following is combined with Figure 1-7 This application is described in further detail.

[0039] Example 1

[0040] The embodiment of the present application discloses an operating mechanism of an isolating switch and a circuit breaker. Figure 1-2 The operating mechanism of the isolating switch includes an isolating shaft 1, a connecting crank arm 2 and an elastic retaining component 3. The elastic retaining component 3 is used to keep the isolating shaft 1 in a closed or open state. The connecting crank arm 2 is rotatably connected to the isolating shaft 1. The isolating shaft 1 is provided with a limiter 4. The limiter 4 is used to limit the relative rotation angle of the connecting crank arm 2 relative to the isolating shaft 1. The rotation angle range between the connecting crank arm 2 and the isolating shaft 1 is smaller than the rotation angle range of the isolating shaft 1. When the isolating shaft 1 drives the connecting crank arm 2 to rotate to the maximum elastic deformation state of the elastic retaining component 3, the rotation angle of the isolating shaft 1 exceeds the relative rotation angle between the connecting crank arm 2 and the isolating shaft 1 limited by the limiter 4.

[0041] The elastic force holding assembly 3 includes a telescopic rod 31, a compression spring 32 and a hinged connecting rod 33. The compression spring 32 is sleeved on the telescopic rod 31. The two ends of the telescopic rod 31 are respectively provided with a limit structure 311. The compression spring 32 is located between the two limit structures 311 of the telescopic rod 31. When the length of the telescopic rod 31 is extended or retracted, the two limit structures 311 can move closer to or farther away from each other, so that the compression spring 32 is compressed and deformed or stretched and restored. Both ends of the telescopic rod 31 are hinged ends. One end of the telescopic rod 31 is hinged to the hinged connecting rod 33, and the cross connecting rod is fixedly connected to the isolation shaft 1.

[0042] In other embodiments, the elastic force retaining component 3 can be replaced by a mechanical structure based on a tension spring.

[0043] Reference Figure 2-4The relative rotation stroke between the connecting crank arm and the limit member has a first limit stroke point and a second limit stroke point; when the limit member moves from the first limit stroke point to the second limit stroke point, the isolation shaft and the connecting crank arm rotate relative to each other, and when the limit member is located at the second limit stroke point, the elastic force keeps the component in a state of maximum elastic deformation.

[0044] When the limiting member moves from the second limit travel point to the first limit travel point, the isolation shaft and the connecting arm rotate relatively, and when the limiting member is located at the first limit travel point, the elastic force keeps the component in the maximum elastic deformation state.

[0045] The connecting crank arm 2 is fixedly provided with a rotating connecting sleeve 21, and the connecting crank arm 2 is rotatably connected to the isolation shaft 1 through the rotating connecting sleeve 21; the limiting member 4 is a flat-headed pin shaft 42, and the flat-headed pin shaft 42 passes through the isolation shaft 1. The limiting member 4 is vertically fixed to the isolation shaft 1. In other embodiments, the limiting member 4 can also be replaced by a columnar component such as a screw or a screw. The peripheral wall of the rotating connecting sleeve 21 is provided with a rotating limiting groove 211 for avoiding the limiting member 4. There are two rotating limiting grooves 211, and the two rotating limiting grooves 211 correspond to the two ends of the flat-headed pin shaft 42 respectively.

[0046] The implementation principle of the operating mechanism of an isolating switch in an embodiment of the present application is as follows: in the process of rotating the isolating shaft 1 to switch the isolating switch between the closing and opening states, the elastic force retaining component 3 passes through the maximum elastic deformation state. In the initial stage of the rotation of the isolating shaft 1, the isolating shaft 1 and the connecting crank arm 2 rotate relative to each other, and at this time, the isolating shaft 1 does not drive the connecting crank arm 2 to rotate. When the rotation angle of the isolating shaft 1 is greater than or equal to the relative rotation angle of the connecting crank arm 2 and the isolating shaft 1 limited by the limiter 4, the isolating shaft 1 can drive the connecting crank arm 2 to rotate through the limiter 4.

[0047] Specifically, in the process of the limit member 4 moving from the first extreme travel point 51 to the second travel point, the isolating shaft 1 rotates and switches from the open state to the closed state. When the limit member 4 is located at the second extreme travel point 52, the isolating shaft 1 begins to drive the connecting arm 2. As the isolating shaft 1 continues to rotate, the elastic retaining component 3 begins to release elastic potential energy, so that the elastic force of the elastic retaining component 3 offsets part of the friction between the static contacts.

[0048] During the process of the limit member 4 moving from the second extreme travel point 52 to the first travel point, the isolating shaft 1 rotates and switches from the closed state to the open state. When the limit member 4 is located at the first extreme travel point 51, the isolating shaft 1 begins to drive the connecting arm 2. As the isolating shaft 1 continues to rotate, the elastic retaining component 3 begins to release elastic potential energy, so that the elastic force of the elastic retaining component 3 offsets part of the friction between the static contacts.

[0049] In the above process, the isolating shaft 1 does not need to drive the connecting crank arm 2 within a certain rotation stroke, which is beneficial to reducing the total load during the operation of the isolating switch and making the operation of the isolating switch more labor-saving and convenient.

[0050] This embodiment also discloses a circuit breaker, comprising the operating mechanism of the isolating switch, wherein the isolating switch operating mechanism is built in the circuit breaker.

[0051] Example 2

[0052] The difference between this embodiment and the first embodiment is that the rotary connection sleeve 21 and the limiting member 4 in this embodiment are different from those in the first embodiment.

[0053] Reference Figure 5 and Figure 6 The limiting member 4 in this embodiment is a pin 42, and two of them are provided. The two pins 42 are respectively located on both sides of the rotating connection sleeve 21, and are respectively located on both sides of the axis of the isolation shaft 1. The two ends of the peripheral wall of the rotating connection sleeve 21 are respectively provided with limiting notches 212 for avoiding the limiting member 4. The limiting notches 212 and the pins 42 cooperate to limit the relative rotation angle between the rotating connection sleeve 21 and the isolation shaft 1.

[0054] The isolation shaft 1 is provided with a pin hole 11 adapted to the pin shaft 42, and the pin shaft 42 is interference fit with the pin hole 11. The pin shaft 42 is provided with a longitudinal section 421, and the longitudinal section 421 is parallel to the axis of the pin shaft 42. The length of the longitudinal section 421 is less than the length of the pin shaft 42. The longitudinal section 421 is partially located on the inner side of the pin hole 11, and the longitudinal section 421 abuts against the inner edge of the limiting notch 212, so that the pin shaft 42 is difficult to rotate around its own axis, which is beneficial to ensuring the stability of the connection between the pin shaft 42 and the isolation shaft 1.

[0055] The inner edge of the limiting notch 212 is provided with an escape notch 213 for escaping the outer circumference of the pin shaft 42, so that the pin shaft 42 can be inserted into the corresponding pin hole 11. A step surface is formed between the longitudinal section 421 and the outer circumference of the pin shaft 42. When the isolation shaft 1 is in the state of closing or opening, the rotating connecting sleeve 21 shields the step surface of the pin shaft 42, so that the pin shaft 42 is not easy to fall off from the pin hole 11.

[0056] Example 3

[0057] The difference between this embodiment and the first embodiment is that the rotary connection sleeve 21 and the limiting member 4 in this embodiment are different from those in the first embodiment.

[0058] Reference Figure 7 Both ends of the rotating connection sleeve 21 are provided with protruding structures 214 , and two limiting members 4 are provided. The two limiting members 4 are respectively located on both sides of the rotating connection sleeve 21 , and the two limiting members 4 correspond to the two protruding structures 214 .

[0059] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An operating mechanism of an isolating switch, comprising an isolating rotating shaft (1), a connecting crank arm (2) and an elastic force retaining assembly (3), wherein the elastic force retaining assembly (3) is used to keep the isolating rotating shaft (1) in a closed or open state, and is characterized in that: The connecting crank arm (2) is rotatably connected to the isolation shaft (1), and the isolation shaft (1) is provided with a limiter (4). The limiter (4) is used to limit the relative rotation angle of the connecting crank arm (2) relative to the isolation shaft (1), and the rotation angle range between the connecting crank arm (2) and the isolation shaft (1) is smaller than the rotation angle range of the isolation shaft (1).

2. The operating mechanism of the isolating switch according to claim 1, characterized in that: The connecting crank arm (2) is provided with a rotating connecting sleeve (21), and the connecting crank arm (2) is rotatably connected to the isolation rotating shaft (1) via the rotating connecting sleeve (21); the limiting member (4) is a columnar structure, and the limiting member (4) is vertically fixed to the isolation rotating shaft (1), and the peripheral wall of the rotating connecting sleeve (21) is provided with a rotating limiting groove (211) for avoiding the limiting member (4).

3. The operating mechanism of the isolating switch according to claim 2, characterized in that: The limiting member passes through the isolation shaft, and two rotation limiting grooves are provided, and the two rotation limiting grooves correspond to two ends of the limiting member respectively.

4. The operating mechanism of the isolating switch according to claim 1, characterized in that: The connecting crank arm (2) is provided with a rotating connecting sleeve (21), and the connecting crank arm (2) is rotatably connected to the isolation rotating shaft (1) through the rotating connecting sleeve (21); the limiting member (4) is a columnar structure, and the limiting member (4) is vertically fixed to the isolation rotating shaft (1), and the peripheral wall of the rotating connecting sleeve (21) is provided with a limiting notch (212) for avoiding the limiting member (4).

5. The operating mechanism of the isolating switch according to claim 4, characterized in that: Two limiting notches (212) are provided, and the two limiting notches (212) are respectively located at two ends of the rotating connection sleeve (21); and the limiting members (4) respectively correspond to the two limiting notches (212).

6. The operating mechanism of the isolating switch according to claim 5, characterized in that: The two limiting notches (212) are located on both sides of the center line of the rotating connection sleeve (21).

7. The operating mechanism of the isolating switch according to claim 6, characterized in that: The limiting member (4) is a pin shaft (42), and the pin shaft (42) is provided with a longitudinal section (421), and the longitudinal section (421) abuts against the inner edge of the limiting notch (212).

8. The operating mechanism of the isolating switch according to claim 1, characterized in that: The relative rotational travel between the connecting crank arm (2) and the limiting member (4) has a first limit travel point (51) and a second limit travel point (52); when the limiting member (4) moves from the first limit travel point (51) to the second limit travel point (52), the isolation shaft (1) and the connecting crank arm (2) rotate relative to each other, and when the limiting member (4) is located at the second limit travel point (52), the elastic force retaining component (3) is in a maximum elastic deformation state.

9. The operating mechanism of the isolating switch according to claim 1, characterized in that: The relative rotational travel between the connecting crank arm (2) and the limiting member (4) has a first limit travel point (51) and a second limit travel point (52); when the limiting member (4) moves from the second limit travel point (52) to the first limit travel point (51), the isolation shaft (1) and the connecting crank arm (2) rotate relative to each other, and when the limiting member (4) is located at the first limit travel point (51), the elastic force retaining component (3) is in a maximum elastic deformation state.

10. A circuit breaker, characterized in that: It comprises the operating mechanism of the isolating switch according to any one of claims 1 to 9, and the isolating switch operating mechanism is built into the circuit breaker.

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