Opening and closing operation mechanism of circuit breaker
By designing the oblong hole on the movable contact support and the pin in the housing in the opening and closing operating mechanism of the circuit breaker, over-travel compression of the circuit breaker is realized when closing, and the problem caused by contact wear and oxidation is solved. It eliminates the problem of poor contact and improves the contact force and closing effect.
Patent Information
- Application Number
- CN202423106642.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2025-01-21
- Estimated Expiration
- 2034-12-17
AI Technical Summary
After multiple closing and opening operations of existing circuit breakers, the contacts may wear, oxidize or age, resulting in the contact surface no longer being flat and affecting the contact effect.
A circuit breaker opening and closing operating mechanism is designed, including a shell, a handle, a static contact support, a moving contact support, a linkage and a tripping mechanism. The moving contact support is provided with a long round hole, which matches pin in the housing, the handle rotates to In the closing position, the moving contact of the moving contact support continues to be squeezed toward the static contact support, and the oblong hole is slightly deflected relative to the pin. The over-travel compression can improve the contact between the moving and static contacts. force, breakdown oxide, and achieve gap compensation.
Through the long round hole provided on the moving contact support and the design of the housing pin, the over-travel compression of the circuit breaker is realized when closing, which improves the contact force between the moving and static contacts and breaks down the oxide , realizes gap compensation and ensures the closing effect.
Smart Images
Figure CN222380526U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of circuit breakers, in particular to an opening and closing operating mechanism of a circuit breaker. Background Art
[0002] Circuit breaker: A mechanical switch that can connect, carry and disconnect current under normal circuit conditions, and can also connect, carry for a certain period of time and automatically disconnect current under specified abnormal circuit conditions, such as short-circuit current. The function of a circuit breaker is well known in the industry. Under normal conditions, it ensures the smooth flow of the electrical circuit; when a circuit fails and generates a short-circuit current or an overcurrent is caused by an overload, the electrical load is separated from the power supply network.
[0003] After long-term use of circuit breakers, especially after multiple closing and opening operations, the contacts may be worn, oxidized or aged, resulting in the contact surface no longer being smooth. Even when closing, there may be a small gap between the contacts; if there are oxides or other contaminants on the contact surface of the static contact and the moving contact, the oxides or contaminants may affect the contact between the contacts, especially when high current flows, the oxides may be burned, resulting in the formation of gaps, so the operating mechanism needs to be in over-travel contact to ensure the closing effect. Utility Model Content
[0004] The purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art and to provide an opening and closing operating mechanism for a circuit breaker.
[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a circuit breaker opening and closing operating mechanism, comprising a shell, a handle, a static contact support, a moving contact support, a linkage member and a tripping mechanism, wherein the handle and the moving contact support are rotatably arranged in the shell, the two ends of the linkage member are respectively linked with the handle and the moving contact support, an oblong hole is arranged on the moving contact support, a pin shaft is arranged in the shell and the pin shaft is passed through the oblong hole, and the moving contact support member can rotate relative to the pin shaft and cooperate with the static contact support member to realize opening and closing.
[0006] As a preferred technical solution of the utility model, a positioning column is arranged in the shell at the position corresponding to the pin shaft, and a positioning hole for inserting the pin shaft is arranged in the positioning column.
[0007] As a preferred technical solution of the utility model, a contact torsion spring is arranged outside the positioning column, and a first supporting surface and a second supporting surface are arranged at intervals inside the shell. The contact torsion spring has two first torsion ends and a second torsion end respectively laid on the first supporting surface and the second supporting surface, and the first torsion end and the second torsion end are limited in a movable space formed between the first supporting surface and the second supporting surface. The moving contact support is provided with a pushing portion which can drive the first torsion end of the contact torsion spring to twist toward the second torsion end to store energy in the closed state.
[0008] As a preferred technical solution of the utility model, a sliding area is provided on the moving contact support, the linkage part is a U-shaped connecting rod, one end of the U-shaped connecting rod is inserted into the handle, and the other end of the U-shaped connecting rod is slidably installed in the sliding area, and the moving contact support is provided with a lock for locking one end of the U-shaped connecting rod to one end of the sliding area.
[0009] As a preferred technical solution of the utility model, the handle is provided with a mounting hole for inserting one end of the U-shaped connecting rod.
[0010] As a preferred technical solution of the utility model, the lock buckle swings relative to the moving contact support and a through hole corresponding to the oblong hole is provided on the lock buckle, the pin shaft passes through the oblong hole of the moving contact support and the through hole of the lock buckle in sequence, and a locking area is provided on the lock buckle that is adapted to the shape of the sliding area and corresponds to the position, a lock buckle torsion spring is provided between the lock buckle and the moving contact support to deflect the locking area relative to the sliding area to form a locking position, and one end of the U-shaped connecting rod is limited to the locking position.
[0011] As a preferred technical solution of the present utility model, the sliding zone includes a first sliding hole and a second sliding hole that are staggered and interconnected, and the locking zone includes a first locking hole and a second locking hole that are staggered and interconnected, a pressing surface is provided between the first sliding hole and the second sliding hole, and the locking position is formed between the inner wall of the first locking hole and the pressing surface.
[0012] As a preferred technical solution of the utility model, the lock is provided with a convex ring coaxially arranged with the through hole, the lock torsion spring is sleeved on the convex ring, the two torsion ends of the lock torsion spring are respectively fixed on the moving contact support and the lock, and when the lock swings relative to the moving contact support, the lock torsion spring stores energy and the hole positions of the locking area and the sliding area correspond.
[0013] As a preferred technical solution of the utility model, a thermal bimetallic strip is arranged in the shell, a pull rod is arranged on the lock buckle, and the lower end portion of the pull rod corresponds to the thermal bimetallic strip.
[0014] To sum up, the beneficial effects of the utility model are as follows: the oblong hole arranged on the moving contact support cooperates with the form of the housing pin shaft, and is not limited to a fixed rotation point. When the handle is rotated to the closing position, the moving contact of the moving contact support continues to be squeezed toward the static contact support (static contact), and the oblong hole is slightly deflected relative to the pin shaft. The over-stroke compression can increase the contact force between the moving and static contacts, and can break through the oxide between the static contact and the moving contact, thereby realizing gap compensation and ensuring the closing effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of the front structure inside the housing of the utility model circuit breaker in the open state;
[0016] Figure 2 It is a schematic diagram of the front structure inside the housing of the utility model circuit breaker in the closed state;
[0017] Figure 3 It is a schematic diagram of the back structure inside the housing of the utility model circuit breaker in the open state;
[0018] Figure 4 It is a schematic diagram of the back structure inside the housing of the utility model circuit breaker in the closed state;
[0019] Figure 5 yes Figure 3 Enlarged view of part A;
[0020] Figure 6 yes Figure 4 Enlarged view of part B;
[0021] Figure 7 It is a structural schematic diagram of the housing in the utility model;
[0022] Figure 8 It is a structural schematic diagram of the handle, the moving contact support, and the lock in the utility model;
[0023] Fig. 9 It is an exploded view of the movable contact support and the lock catch in the utility model;
[0024] Fig.10 It is a structural schematic diagram of the movable contact support member in the utility model;
[0025] Fig.11 It is a structural schematic diagram of the lock buckle in the utility model.
[0026] Figure numerals: 1. shell; 11. pin; 12. positioning column; 121. positioning hole; 13. first supporting surface; 14. second supporting surface; 15. thermal bimetallic strip; 2. handle; 21. mounting hole; 3. static contact support; 4. moving contact support; 41. oblong hole; 42. push portion; 43. sliding zone; 431. first sliding hole; 432. second sliding hole; 433. pressing surface; 44. moving contact; 45. locking position; 5. linkage member; 51. U-shaped connecting rod; 6. tripping mechanism; 7. contact torsion spring; 71. first torsion end; 72. second torsion end; 8. lock; 81. through hole; 82. locking zone; 821. first locking hole; 822. second locking hole; 83. pull rod; 84. lock torsion spring; 85. convex ring. DETAILED DESCRIPTION
[0027] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments and drawings, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.
[0028] The specific embodiments of the present utility model are described below in conjunction with the accompanying drawings.
[0029] like Figure 1-11 A circuit breaker opening and closing operating mechanism shown in the figure includes a housing 1, a handle 2, a static contact support 3, a moving contact support 4, a linkage member 5 and a tripping mechanism 6. The handle 2 and the moving contact support 4 are rotatably arranged in the housing 1, and the two ends of the linkage member 5 are respectively linked with the handle 2 and the moving contact support 4. An oblong hole 41 is provided on the moving contact support 4. A pin shaft 11 is provided in the housing 1 and the pin shaft 11 is penetrated in the oblong hole 41. The moving contact support 4 can rotate relative to the pin shaft 11 and cooperate with the static contact support 3 to realize opening and closing. The tripping mechanism 6 in this embodiment is a prior art, so it is not specifically described.
[0030] The circuit breaker opening and closing operating mechanism of this scheme has a simple structure, streamlined parts, relatively low manufacturing cost, high production efficiency, and the mechanism design increases the distance between the moving contact and the static contact of the circuit breaker. The larger the distance, the more beneficial it is to disconnect the arc. After streamlining the parts, the disconnection time is shortened, the short-circuit breaking capacity is improved, and the short-circuit breaking capacity is made more stable.
[0031] The manner in which the oblong hole 41 is provided on the moving contact support 4 to cooperate with the pin shaft 11 is not limited to a fixed rotation point. When the handle 2 is rotated to the closing position, the moving contact 44 of the moving contact support 4 continues to be squeezed toward the static contact support 3 (static contact), and the oblong hole 41 is slightly deflected relative to the pin shaft 11. The over-travel compression can increase the contact force between the moving and static contacts, and can break through the oxide between the static contact and the moving contact 44, thereby achieving gap compensation and ensuring the closing effect.
[0032] A positioning column 12 is arranged in the shell 1 at a position corresponding to the pin shaft 11, and a positioning hole 121 for inserting the pin shaft 11 is arranged in the positioning column 12, and a contact torsion spring 7 is arranged on the outer sleeve of the positioning column 12. A first supporting surface 13 and a second supporting surface 14 are arranged in the shell 1 at intervals, and the contact torsion spring 7 has two first torsion ends 71 and a second torsion end 72 respectively arranged on the first supporting surface 13 and the second supporting surface 14, and the first torsion end 71 and the second torsion end 72 are limited in the activity space formed between the first supporting surface 13 and the second supporting surface 14, and the moving contact support 4 is provided with a pushing portion 42 which can drive the first torsion end 71 of the contact torsion spring 7 to twist toward the second torsion end 72 for energy storage in the closed state.
[0033] A sliding area 43 is provided on the moving contact support 4, and the linkage member 5 is a U-shaped connecting rod 51. One end of the U-shaped connecting rod 51 is inserted into the handle 2, and the other end of the U-shaped connecting rod 51 is slidably installed in the sliding area 43. A lock 8 is provided on the moving contact support 4 for locking one end of the U-shaped connecting rod 51 at one end of the sliding area 43, and a mounting hole 21 is provided on the handle 2 for inserting one end of the U-shaped connecting rod 51.
[0034] The lock catch 8 swings relative to the moving contact support and a through hole 81 corresponding to the oblong hole 41 is provided on the lock catch 8. The pin shaft 11 passes through the oblong hole 41 of the moving contact support 4 and the through hole 81 of the lock catch 8 in sequence. A locking area 82 that is adapted in shape and corresponds in position to the sliding area 43 is provided on the lock catch 8. A lock torsion spring 84 is provided between the lock catch 8 and the moving contact support to deflect the locking area 82 relative to the sliding area 43 to form a locking position 45. One end of the U-shaped connecting rod 51 is limited at the locking position 45.
[0035] The sliding zone 43 includes a first sliding hole 431 and a second sliding hole 432 that are staggered and interconnected, and the locking zone 82 includes a first locking hole 821 and a second locking hole 822 that are staggered and interconnected. A clamping surface 433 is provided between the first sliding hole 431 and the second sliding hole 432, and a locking position 45 is formed between the inner wall of the first locking hole 821 and the clamping surface 433.
[0036] The lock buckle 8 is provided with a convex ring 85 coaxially arranged with the through hole 81, and the lock buckle torsion spring 84 is sleeved on the convex ring 85. The two torsion ends of the lock buckle torsion spring 84 are respectively fixed on the moving contact support 4 and the lock buckle 8. When the lock buckle 8 swings relative to the moving contact support 4, the lock buckle torsion spring 84 stores energy and the hole positions of the locking area 82 and the sliding area 43 correspond.
[0037] A thermal bimetallic strip 15 is disposed in the housing 1 , and a pull rod 83 is disposed on the lock buckle 8 , and the lower end portion of the pull rod 83 corresponds to the thermal bimetallic strip 15 .
[0038] Working principle: The locking area 82 of the lock catch 8 and the sliding area 43 of the moving contact support 4 form a locking position 45 that can fix one end of the U-shaped connecting rod 51. When the handle 2 is in the initial position of the opening switch, Figure 3 , 5 From the back view of the housing 1, the pin 11 is at the left end of the oblong hole 41. When the manual control handle 2 is closed, the oblong hole 41 of the moving contact support 4 will deviate to the middle position relative to the pin 11 or move to the other end of the oblong hole 41, and the over-travel compression (because the oblong hole 41 will deviate relative to the pin 11, such as Figure 2As shown, when the closing action is viewed from the front of the housing 1, the moving contact of the moving contact support 4 will be further approached to the static contact), increasing the contact force between the contacts, being able to break through the oxide between the static contact and the moving contact 44, and at the same time being able to achieve gap compensation to ensure the closing effect. If a current overload occurs during operation, the heat generated by the current will cause the bimetallic strip to overheat. Due to the different thermal expansion coefficients of the active layer and the passive layer, the thermal bimetallic strip 15 will bend toward the passive layer, pushing the lower end of the pull rod 83 to deflect the lock buckle 8 relative to the moving contact support 4, and the lock buckle torsion spring 84 is compressed to store energy. One end of the U-shaped connecting rod 51 can be disengaged from the locking position 45 under the action of the contact torsion spring 7. Specifically, the first sliding hole 431 of the moving contact support 4 and the first locking hole 821 of the lock buckle 8 are adjusted to a parallel or nearly parallel state, and one end of the U-shaped connecting rod 51 will not be pressed against the pressing surface 433. The contact torsion spring 7 releases energy, and one end of the U-shaped connecting rod 51 It is displaced into the second sliding hole 432 of the moving contact support 4, quickly realizing opening of the switch and playing the role of overload protection; if a short-circuit current occurs during operation, the magnetic field generated by the coil in the releaser will instantly increase, and become large enough to attract the moving iron core. At this time, the push rod connected to the moving iron core will push the lock buckle 8 device to disconnect the product and play the role of short-circuit protection, specifically: the push rod touches the lock buckle 8 to make it deflect relative to the moving contact support 4, the lock buckle torsion spring 84 is compressed to store energy, and one end of the U-shaped connecting rod 51 can be separated from the locking position 45 under the action of the contact torsion spring 7, specifically: the first sliding hole 431 of the moving contact support 4 and the first locking hole 821 of the lock buckle 8 are adjusted to a parallel or nearly parallel state, one end of the U-shaped connecting rod 51 will not be pressed against the pressing surface 433, the contact torsion spring 7 releases energy, and one end of the U-shaped connecting rod 51 is displaced into the second sliding hole 432 of the moving contact support 4, quickly realizing opening of the switch and playing the role of short-circuit protection.
[0039] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only preferred examples of the utility model, and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected, and the scope of protection of the utility model is defined by the attached claims and their equivalents.
Claims
1. A circuit breaker opening and closing operating mechanism, comprising a housing (1), a handle (2), a static contact support (3), a moving contact support (4), a linkage member (5) and a tripping mechanism (6), wherein the handle (2) and the moving contact support (4) are rotatably arranged in the housing (1), and two ends of the linkage member (5) are respectively linked with the handle (2) and the moving contact support (4), and characterized in that: The moving contact support (4) is provided with an oblong hole (41), the housing (1) is provided with a pin shaft (11) and the pin shaft (11) is inserted into the oblong hole (41), and the moving contact support (4) can rotate relative to the pin shaft (11) and cooperate with the stationary contact support (3) to realize opening and closing.
2. The circuit breaker opening and closing operating mechanism according to claim 1, characterized in that: A positioning column (12) is arranged in the housing (1) at a position corresponding to the pin shaft (11), and a positioning hole (121) for inserting the pin shaft (11) is arranged in the positioning column (12).
3. The circuit breaker opening and closing operating mechanism according to claim 2, characterized in that: The positioning column (12) is provided with a contact torsion spring (7) on its outer sleeve, and a first supporting surface (13) and a second supporting surface (14) are arranged in the housing (1) at intervals. The contact torsion spring (7) has two first torsion ends (71) and a second torsion end (72) which are respectively arranged on the first supporting surface (13) and the second supporting surface (14). The first torsion end (71) and the second torsion end (72) are limited in a movable space formed between the first supporting surface (13) and the second supporting surface (14). The movable contact support (4) is provided with a pushing portion (42) which can drive the first torsion end (71) of the contact torsion spring (7) to twist toward the second torsion end (72) to store energy in a closed state.
4. The opening and closing operating mechanism of the circuit breaker according to any one of claims 1 to 3, characterized in that: The movable contact support (4) is provided with a sliding area (43); the linkage member (5) is a U-shaped connecting rod (51); one end of the U-shaped connecting rod (51) is inserted into the handle (2); the other end of the U-shaped connecting rod (51) is slidably installed in the sliding area (43); and the movable contact support (4) is provided with a lock (8) for locking one end of the U-shaped connecting rod (51) to one end of the sliding area (43).
5. The opening and closing operating mechanism of the circuit breaker according to claim 4, characterized in that: The handle (2) is provided with a mounting hole (21) for inserting one end of the U-shaped connecting rod (51).
6. The opening and closing operating mechanism of the circuit breaker according to claim 4, characterized in that: The lock catch (8) swings relative to the moving contact support and a through hole (81) corresponding to the oblong hole (41) is provided on the lock catch (8); the pin shaft (11) passes through the oblong hole (41) of the moving contact support (4) and the through hole (81) of the lock catch (8) in sequence; the lock catch (8) is provided with a locking area (82) whose shape matches the sliding area (43) and whose position corresponds to the sliding area (43); a lock catch torsion spring (84) is provided between the lock catch (8) and the moving contact support to deflect the locking area (82) relative to the sliding area (43) to form a locking position (45); and one end of the U-shaped connecting rod (51) is limited at the locking position (45).
7. The opening and closing operating mechanism of the circuit breaker according to claim 6, characterized in that: The sliding zone (43) comprises a first sliding hole (431) and a second sliding hole (432) which are arranged in a staggered manner and are interconnected; the locking zone (82) comprises a first locking hole (821) and a second locking hole (822) which are arranged in a staggered manner and are interconnected; a pressing surface (433) is provided between the first sliding hole (431) and the second sliding hole (432); and the locking position (45) is formed between the inner wall of the first locking hole (821) and the pressing surface (433).
8. The opening and closing operating mechanism of the circuit breaker according to claim 6, characterized in that: The lock buckle (8) is provided with a convex ring (85) coaxially arranged with the through hole (81); the lock buckle torsion spring (84) is sleeved on the convex ring (85); two torsion ends of the lock buckle torsion spring (84) are respectively fixed on the moving contact support (4) and the lock buckle (8); when the lock buckle (8) swings relative to the moving contact support (4), the lock buckle torsion spring (84) stores energy and the hole positions of the locking area (82) and the sliding area (43) correspond.
9. The opening and closing operating mechanism of the circuit breaker according to claim 8, characterized in that: A thermal bimetallic strip (15) is arranged in the shell (1), and a pull rod (83) is arranged on the lock buckle (8), and the lower end portion of the pull rod (83) corresponds to the thermal bimetallic strip (15).