Opening and closing control transmission structure and circuit breaker

Abstract

The utility model discloses an opening and closing control transmission structure and a circuit breaker, the opening and closing control transmission structure comprises a moving contact driving assembly and a spring holding assembly, the moving contact driving assembly comprises an output connecting lever and three output cranks, and the output connecting lever and the three output cranks are rotatably installed on an installation structure of the circuit breaker. The output cranks are used for driving a moving contact of the vacuum arc-extinguishing chamber to reciprocate, the output crank arm and one of the output cranks are jointly hinged with a connecting rod, and a driving shaft lever is jointly hinged between the output cranks; the spring retaining assembly comprises a pressure spring, an on-shaft limiting piece and a fixed limiting piece, the pressure spring sleeves the driving shaft rod, the on-shaft limiting piece is fixedly mounted on the driving shaft rod, and the fixed limiting piece is fixed on a mounting structure of the circuit breaker; when the output crank drives the moving contact of the vacuum arc-extinguishing chamber to leave the static contact, the on-shaft limiting piece moves in the direction away from the fixed limiting piece. The problems that the cost of the driving shaft rod is high and the service life of the opening retaining spring is short can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of circuit breakers, in particular to a closing and opening control transmission structure and a circuit breaker. BACKGROUND

[0002] A circuit breaker refers to a switching device capable of making, carrying and breaking current under normal circuit conditions and capable of making, carrying and breaking current under abnormal circuit conditions. During the closing and opening process of the circuit breaker, the circuit breaker drives the moving contact in the vacuum arc chamber to move closer to or away from the static contact through the transmission structure.

[0003] REFERENCE Figure 1 、 Figure 2 In the prior art, the transmission structure for controlling the movement of the moving contact in the circuit breaker includes three output cranks 12, an output crank arm 11 and an opening state maintaining spring. The three output cranks 12 are parallel to each other, and each of the three output cranks 12 is used to drive one of the three moving contacts. The three output cranks 12 are jointly hinged to a drive shaft 13. The output crank arm 11 drives the drive shaft 13 to reciprocate under the drive of the motor. Due to the installation position of the output crank arm 11, it is often impossible to keep the three output cranks 12 parallel and the same length. Therefore, a waist-shaped hole 131 is provided on the drive shaft 13 for the shaft provided on the output crank arm 11 to slide and cooperate. The length direction of the waist-shaped hole 131 needs to be intersected with the length direction of the drive shaft 13, so that the output crank arm 11 can push the drive shaft 13 to perform the closing and opening action through the shaft. When the drive shaft 13 is in the opening state, the opening state maintaining spring can prevent the drive shaft 13 from switching to the closing state.

[0004] Since the length of the waist-shaped hole 131 is larger than that of a general pin hole, a square rod is often used as the drive shaft 13 to meet the requirement of opening the waist-shaped hole. The cost of the square rod structure of the drive shaft 13 is relatively higher than that of the round rod structure. Under this premise, it is difficult to install the spring for keeping the drive shaft 13 in a stable opening state on the drive shaft 13, otherwise the extension state of the spring is difficult to keep stable. Therefore, to adapt to the square rod-shaped drive shaft 13, the opening state maintaining spring often adopts a tension spring. However, the service life of the tension spring is relatively shorter than that of the compression spring 21, which increases the maintenance frequency of the circuit breaker. CONTENT OF THE UTILITY MODEL

[0005] In order to improve the problems of high cost of the drive shaft and short service life of the opening state maintaining spring in the transmission structure for driving the movement of the moving contact in the circuit breaker in the prior art, the present application provides a closing and opening control transmission structure and a circuit breaker.

[0006] The closing and opening control transmission structure and the circuit breaker provided by the present application adopt the following technical solutions:

[0007] The opening and closing control transmission structure comprises a movable contact driving assembly and a spring retaining assembly, the movable contact driving assembly comprises an output crank arm and three output cranks, the output crank arm and the three output cranks are rotatably installed on the mounting structure of the circuit breaker in use, the output cranks are used to drive the movable contact of the vacuum arc-extinguishing chamber to reciprocate, the output crank arm is hingedly connected with one of the output cranks through a connecting rod, and the output cranks are hingedly connected with each other through a driving shaft.

[0008] By adopting the above technical scheme, the output crank arm drives one of the output cranks through the connecting rod, and then indirectly drives the other two output cranks through the driving shaft, so as to realize the opening and closing control of the movable contact of the vacuum arc-extinguishing chamber. In this way, the waist-shaped hole for the shaft of the output crank arm to slide is not needed to be formed on the driving shaft, the driving shaft does not need to be set as a rectangular section rod, the driving shaft can be set as a round rod structure, which is beneficial to save cost, and the compression spring can be sleeved on the driving shaft, the compression spring cooperates with the upper shaft limiting piece and the fixed limiting piece to hinder the driving shaft from moving from the state corresponding to the opening to the state corresponding to the closing, so as to realize the purpose of keeping the opening. Under the condition of the same helical diameter and wire diameter specification, the service life of the compression spring is longer than that of the tension spring, which is beneficial to guarantee the reliability and stability of the circuit breaker in use and reduce the failure rate.

[0009] Optionally, the position, at which the output crank is connected with the mounting structure of the circuit breaker, is set as a rotary mounting point, the position, at which the output crank is hingedly connected with the driving shaft, is set as a swing hinging point, and the position, at which the output crank is used to drive the movable contact, is set as a driving point; the output crank comprises a transverse section and a longitudinal section, the rotary mounting point is located at the connecting part between the transverse section and the longitudinal section, the swing hinging point is located at the longitudinal section, and the driving point is located at the transverse section; the distance between the rotary mounting point and the swing hinging point is greater than the distance between the rotary mounting point and the driving point.

[0010] By adopting the above technical scheme, the distance between the rotary mounting point and the swing hinging point of the output crank is greater than the distance between the rotary mounting point and the driving point, based on the principle that the power arm is greater than the resistance arm, the driving shaft can be more easily driven by the output crank to drive the movable contact of the vacuum arc-extinguishing chamber.

[0011] Optionally, the output crank connected with the connecting rod in the output crank is provided as a driving output crank, and the connecting rod is located between the swing hinging point and the rotating mounting point of the driving output crank.

[0012] By adopting the technical scheme, when the connecting rod drives the driving output crank, the two ends of the driving output crank form resistance arms relative to the action points of the connecting rod, and by locating the connecting rod between the swing hinging point and the rotating mounting point of the driving output crank, the stress of the two ends of the driving output crank can be balanced.

[0013] Optionally, the connecting rod is located on the side of the swing hinging point of the driving output crank away from the rotating mounting point.

[0014] By adopting the technical scheme, the connecting rod is located on the side of the swing hinging point of the driving output crank away from the rotating mounting point, so that the power wall is greater than the resistance wall when the connecting rod drives the driving output crank, and the output crank arm is more easily driven by the connecting rod.

[0015] Optionally, the output crank arm, the connecting rod and the driving output crank form a parallelogram linkage.

[0016] By adopting the technical scheme, the output crank arm, the connecting rod and the driving output crank form a parallelogram linkage, so that the rotation angle of the output crank arm is consistent with the rotation angle of the output crank, and the rotation angle of the output crank arm can be adjusted as required.

[0017] Optionally, the other two output cranks in the output crank are provided as driven output cranks, one of the driven output cranks is provided with a virtual constraint connecting rod in a hinging manner, the virtual constraint connecting rod comprises a first hinging rod and a second hinging rod hinged with each other, the first hinging rod is hinged with the driven output crank, and the second hinging rod is used for being hinged to the mounting structure of the circuit breaker.

[0018] By adopting the technical scheme, by arranging the virtual constraint connecting rod, the stability of the movable contact driving assembly can be improved.

[0019] Optionally, when the movable contact driving assembly is in a closing state, the first hinging rod and the second hinging rod are axially aligned and are both perpendicular to the driven output crank.

[0020] By adopting the technical scheme, when the first hinging rod and the second hinging rod are aligned, the reverse force of the driven output crank on the virtual constraint connecting rod is aligned with the virtual constraint connecting rod, so that the virtual constraint connecting rod has a temporary locking effect, the closing state of the movable contact driving assembly is kept stable, and the load of the closing maintaining structure of the circuit breaker is reduced.

[0021] A circuit breaker comprises the opening and closing control transmission structure according to any one of the preceding embodiments.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] In the present application, the drive shaft rod can be provided as a round rod structure, so that a compression spring can be sleeved on the drive shaft rod. The compression spring cooperates with the shaft limiting piece and the fixed limiting piece to hinder the drive shaft rod from moving from the corresponding open state to the corresponding closed state, thereby achieving the purpose of keeping the circuit breaker open. Under the same screw diameter and wire diameter specifications, the service life of the compression spring is longer than that of the tension spring, which is conducive to ensuring the reliability and stability of the circuit breaker in use and reducing the failure rate.

[0024] The distance between the rotation mounting point of the output crank and the swing hinge point is greater than the distance between the rotation mounting point and the driving point. Based on the principle that the power arm is greater than the resistance arm, the drive shaft rod can be more easily driven by the output crank to drive the moving contact of the vacuum arc-extinguishing chamber. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a schematic view of a transmission structure for controlling the movement of the moving contact in the prior art.

[0026] Figure 2 is a schematic view of another perspective of the transmission structure for controlling the movement of the moving contact in the prior art.

[0027] Figure 3 is a schematic view of the open-close control transmission structure of embodiment 1 in the closed state.

[0028] Figure 4 is a schematic view of the open-close control transmission structure of embodiment 1 in the open state.

[0029] Figure 5 is a schematic view of the open-close control transmission structure of embodiment 2.

[0030] Figure 6 is a schematic view of the open-close control transmission structure of embodiment 3.

[0031] Figure 7 is a schematic view of the open-close control transmission structure of embodiment 4.

[0032] BRIEF DESCRIPTION OF DRAWINGS:

[0033] 1. moving contact driving assembly; 11. output crank arm; 12. output crank; 121. transverse section; 122. longitudinal section; 123. rotary mounting point; 124. swing articulation point; 125. driving point; 1201. driving output crank; 1202. driven output crank; 13. driving shaft; 131. waist-shaped hole; 14. connecting rod; 2. spring holding assembly; 21. compression spring; 22. shaft upper stop; 23. fixed stop; 3. mounting structure of circuit breaker; 31. mounting plate; 32. sheet metal connecting piece; 4. virtual constraint connecting rod; 41. first articulation rod; 42. second articulation rod; 20. opening and closing holding spring. DETAILED DESCRIPTION

[0034] The following will be described in detail with reference to the accompanying drawings. Figures 3-7 The application is further described in detail. Embodiment 1

[0035] The embodiment of the application discloses a kind of opening and closing control transmission structure. Refer to Figure 3 And Figure 4 Opening and closing control transmission structure includes moving contact driving assembly 1 and spring holding assembly 2, moving contact driving assembly 1 includes output crank arm 11 and three output cranks 12, output crank arm 11 and three output cranks 12 are rotatably mounted on the mounting structure 3 of circuit breaker in use state, and output crank 12 is used to drive the reciprocating movement of the moving contact of vacuum arc-extinguishing chamber, output crank arm 11 is articulated with connecting rod 14 with one of output cranks 12, and the output crank 12 connected with connecting rod 14 in output crank arm 11 is set as driving output crank 1201, and the other two output cranks 12 are set as driven output crank 1202;Driving shaft 13 is articulated between each output crank 12.

[0036] Output crank arm 11, connecting rod 14 and driving output crank 1201 form plane connecting rod 14 mechanism, the included angle between output crank arm 11 and connecting rod 14 is always kept to the same side, and the included angle between output crank arm 11 and connecting rod 14 is greater in closing state than in opening state.

[0037] The position of output crank 12 connected with the mounting structure 3 of circuit breaker is set as rotary mounting point 123, the position of output crank 12 articulated with driving shaft 13 is set as swing articulation point 124, and the position of output crank 12 for driving moving contact is set as driving point 125;Connecting rod 14 is located between swing articulation point 124 and rotary mounting point 123 of driving output crank 1201.

[0038] The output crank 12 comprises a transverse section 121 and a longitudinal section 122, a rotating mounting point 123 is located at a connecting position between the transverse section 121 and the longitudinal section 122, a swinging hinge point 124 is located at the longitudinal section 122, and a driving point 125 is located at the transverse section 121; the distance between the rotating mounting point 123 and the swinging hinge point 124 is greater than the distance between the rotating mounting point 123 and the driving point 125. When the driven trigger crank drives the moving contact of the vacuum arc-extinguishing chamber under the drive of the drive shaft rod 13, the driven trigger crank can drive the moving contact of the vacuum arc-extinguishing chamber in the manner of a force-saving lever.

[0039] The spring retaining assembly 2 comprises a compression spring 21, an upper shaft limiting piece 22 and a fixed limiting piece 23. The compression spring 21 is sleeved on the drive shaft rod 13. The upper shaft limiting piece 22 is a pin which is vertically inserted and fixed on the drive shaft rod 13. The fixed limiting piece 23 is used for being fixedly installed on the mounting structure 3 of the circuit breaker and is a sheet metal piece. When the output crank 12 drives the moving contact of the vacuum arc-extinguishing chamber to move away from the stationary contact, the upper shaft limiting piece 22 moves away from the fixed limiting piece 23.

[0040] The implementation principle of the opening and closing control transmission structure in the embodiment is as follows: the output crank arm 11 drives the driving output crank 1201 through the connecting rod 14, and then indirectly drives the driven output crank 1202 through the driving shaft rod 13 and the driving output crank 1201, so as to realize the opening and closing control of the moving contact of the vacuum arc-extinguishing chamber. In this way, the waist-shaped hole for the shaft of the output crank arm 11 to slide is not needed to be formed on the driving shaft rod 13, the driving shaft rod 13 does not need to be set as a rectangular section rod, the driving shaft rod 13 can be set as a round rod structure, which is beneficial to saving cost, and the compression spring 21 can be sleeved on the driving shaft rod 13, and the compression spring 21 is used as a spring for keeping the driving shaft rod 13 in the opening state. The compression spring 21 cooperates with the upper shaft limiting piece 22 and the fixed limiting piece 23 to prevent the driving shaft rod 13 from moving from the state corresponding to the opening to the state corresponding to the closing, so as to achieve the purpose of keeping the opening. In the case of the same screw diameter and wire diameter specifications, the service life of the compression spring 21 is longer than that of the tension spring, which is beneficial to guaranteeing the reliability and stability of the circuit breaker in use and reducing the failure rate.

[0041] The embodiment also discloses a circuit breaker which comprises the opening and closing control transmission structure and a mounting plate 31. The output crank 12 and the output crank arm 11 of the moving contact driving assembly 1 are both rotatably installed on the mounting plate 31, and the mounting plate 31 can be used for simultaneously installing other components of the circuit breaker. The end of the driven output crank 1202 of the moving contact driving assembly 1 away from the driving shaft rod 13 is provided with a sheet metal connecting piece 32, and the sheet metal connecting piece 32 and the mounting plate 31 both belong to the mounting structure 3 of the circuit breaker. Embodiment 2

[0042] Reference Figure 5The embodiment is different from the embodiment 1 in that the output crank 11, the connecting rod 14 and the driving output crank 1201 form a parallelogram connecting rod 14 mechanism, so that the rotation angle of the output crank 11 is consistent with the rotation angle of the output crank 12, and the rotation angle of the output crank 11 is adjusted as needed. Embodiment 3

[0043] Referring to Figure 6 The embodiment is different from the embodiment 1 in that the connecting rod 14 is located on the side of the swing hinge point 124 of the driving output crank 1201 away from the rotation mounting point 123, in which case, the output crank 11 is more labor-saving when driving the driving output crank 1201 through the connecting rod 14. Embodiment 4

[0044] Referring to Figure 7 The embodiment is different from the embodiment 1 in that among the two driven output cranks 1202, the driven output crank 1202 away from the driving output crank 1201 is hingedly provided with a virtual constraint connecting rod 4, the virtual constraint connecting rod 4 comprising a first hinge rod 41 and a second hinge rod 42 hingedly arranged with each other, the first hinge rod 41 being hinged with the driven output crank 1202, and the second hinge rod 42 being used for being hinged with the mounting structure 3 of the circuit breaker. When the movable contact driving assembly 1 is in the closed state, the first hinge rod 41 and the second hinge rod 42 are axially aligned and both are perpendicular to the driven output crank 1202.

[0045] By arranging the virtual constraint connecting rod 4, the stability of the movable contact driving assembly 1 can be increased. When the first hinge rod 41 of the virtual constraint connecting rod 4 is aligned with the second hinge rod, the reverse force of the driven output crank 1202 on the virtual constraint connecting rod 4 is aligned with the virtual constraint connecting rod 4, so that the virtual constraint connecting rod 4 has a temporary locking effect, the closed state of the movable contact driving assembly 1 is kept stable, and the load of the closed holding structure of the circuit breaker is reduced.

[0046] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A gate opening and closing control transmission structure, characterized in that: The circuit breaker includes a moving contact drive assembly (1) and a spring retaining assembly (2). The moving contact drive assembly (1) includes an output crank arm (11) and three output cranks (12). In use, the output crank arm (11) and the three output cranks (12) are rotatably mounted on the circuit breaker's mounting structure (3). The output cranks (12) are used to drive the moving contact of the vacuum interrupter to reciprocate. The output crank arm (11) and one of the output cranks (12) are hinged together by a connecting rod (14). All the output cranks (12) are hinged together by a drive mechanism. The driving shaft (13) is a spring retaining assembly (2), which includes a compression spring (21), an upper shaft limit member (22), and a fixed limit member (23). The compression spring (21) is sleeved on the driving shaft (13), the upper shaft limit member (22) is fixedly installed on the driving shaft (13), and the fixed limit member (23) is used to fix it on the mounting structure (3) of the circuit breaker. When the output crank (12) drives the moving contact of the vacuum interrupter to leave the stationary contact, the upper shaft limit member (22) moves away from the fixed limit member (23).

2. The opening and closing control transmission structure according to claim 1, characterized in that: The position where the output crank (12) is connected to the circuit breaker mounting structure (3) is set as the rotary mounting point (123), the position where the output crank (12) is hinged to the drive shaft (13) is set as the swing hinge point (124), and the position where the output crank (12) is used to drive the moving contact is set as the driving point (125). The output crank (12) includes a transverse section (121) and a longitudinal section (122). The rotary mounting point (123) is located at the connection between the transverse section (121) and the longitudinal section (122). The swing hinge point (124) is located in the longitudinal section (122), and the driving point (125) is located in the transverse section (121). The distance between the rotary mounting point (123) and the swing hinge point (124) is greater than the distance between the rotary mounting point (123) and the driving point (125).

3. The opening and closing control transmission structure according to claim 2, characterized in that: The output crank (12) that connects to the connecting rod (14) is set as an active output crank (1201), and the connecting rod (14) is located between the swing hinge point (124) and the rotation mounting point (123) of the active output crank (1201).

4. The opening and closing control transmission structure according to claim 3, characterized in that: The connecting rod (14) is located on the side of the swing hinge point (124) of the active output crank (1201) away from the rotary mounting point (123).

5. The opening and closing control transmission structure according to claim 3, characterized in that: The output crank arm (11), the connecting rod (14), and the active output crank (1201) form a parallelogram connecting rod (14) mechanism.

6. The opening and closing control transmission structure according to claim 2, characterized in that: The other two output cranks (12) of the output cranks (12) are configured as driven output cranks (1202). One of the driven output cranks (1202) is hinged to a virtual constraint link (4). The virtual constraint link (4) includes a first hinge link (41) and a second hinge link (42) that are hinged to each other. The first hinge link (41) is hinged to the driven output crank (1202), and the second hinge link (42) is used to hinge to the mounting structure (3) of the circuit breaker.

7. The opening and closing control transmission structure according to claim 6, characterized in that: When the moving contact drive assembly (1) is in the closed state, the first hinge rod (41) and the second hinge rod (42) are axially aligned and both are perpendicular to the driven output crank (1202).

8. A circuit breaker, characterized in that: The invention includes a gate opening and closing control transmission structure as described in any one of claims 1-7.

Images