Rapid closing operation mechanism of circuit breaker

Abstract

The invention discloses a quick closing operation mechanism of a circuit breaker, which comprises a shell, a handle, a static contact supporting piece, a moving contact supporting piece, a linkage piece and a tripping mechanism, and is characterized in that the handle and the moving contact supporting piece are rotationally arranged in the shell, a contact torsion spring is arranged between the shell and the moving contact supporting piece, the moving contact supporting piece is provided with a long circular hole, and the linkage piece is arranged in the long circular hole; a pin shaft is arranged in the shell and penetrates through the oblong hole, and the moving contact supporting piece rotates relative to the pin shaft; an installation area is arranged in the shell, the energy storage limiting piece slides and is limited in the installation area, the handle is provided with a moving area, the moving contact supporting piece is provided with an abutting portion, and the energy storage limiting piece is provided with a moving portion limited in the moving area and a matching portion. And in the last section of closing action, energy storage is realized based on the energy storage limiting piece, oxide between the moving contact and the static contact can be quickly broken down, and the overall closing effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of circuit breakers, and in particular to a fast 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] For circuit breakers that have been used for a long time, 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 the circuit breaker is closed, 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, and the speed of the manual operation handle will affect the closing speed of the moving contact. When closing, an arc will be generated between the moving contact and the static contact, causing the moving and static contacts to be burned by the arc when closing. All of the above situations will affect the closing effect. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and to provide a fast closing operating mechanism for a circuit breaker.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a fast closing operating mechanism of a circuit breaker, comprising a housing, a handle, a static contact support, a moving contact support, a linkage member, an energy storage limiter and a tripping mechanism, wherein the handle and the moving contact support are rotatably arranged in the housing, and the two ends of the linkage member are respectively linked with the handle and the moving contact support, a contact torsion spring is arranged between the housing and the moving contact support, an oblong hole is arranged on the moving contact support, a pin is arranged in the housing and the pin is penetrated in the oblong hole, and the moving contact support rotates relative to the pin; an installation area located between the handle and the moving contact support is arranged in the housing, the energy storage limiter slides and is limited in the installation area, an active area is arranged on the handle, and an abutment portion is arranged on the moving contact support, and the energy storage limiter has a moving portion and a matching portion limited in the active area, the matching portion is located on the rotation path of the abutment portion, and the matching portion is quickly staggered after briefly abutting against the abutment portion during the closing process of the handle.

[0006] As a preferred technical solution of the present invention, a positioning column is arranged in the shell at a 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 present invention, a contact torsion spring is disposed on the outer sleeve of the positioning column, and a first supporting surface and a second supporting surface are spaced apart in 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 a closed state.

[0008] As a preferred technical solution of the present invention, 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, the moving contact support is provided with a lock for locking one end of the U-shaped connecting rod at one end of the sliding area, and the handle is provided with a mounting hole for inserting one end of the U-shaped connecting rod.

[0009] As a preferred technical solution of the present invention, 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.

[0010] As a preferred technical solution of the present invention, 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.

[0011] As a preferred technical solution of the present invention, the energy storage limiter includes a main body, the moving part and the matching part are located at both ends of the main body, the energy storage limiter also includes an elastic part located below the main body, an upper blocking part and a lower blocking part are arranged at positions corresponding to the installation area in the shell, the energy storage limiter slides and is limited between the upper blocking part and the lower blocking part, the upper blocking part is located above the main body, and the elastic part is mounted on the lower blocking part.

[0012] As a preferred technical solution of the present invention, the elastic part includes an arched elastic section, one end of the elastic section is fixedly connected to the main body, the other end of the elastic section serves as a movable end and a spherical limit block is provided at the movable end, the lower blocking part is located on one side of the moving contact support and a limit groove is provided, and the spherical limit block is stuck in the limit groove when the handle is in the initial position of the switch-off.

[0013] As a preferred technical solution of the present invention, a side plate is arranged in the housing at a position corresponding to the installation area, and the side plate is arranged close to one side of the handle. When the handle is in the closing position, one end of the elastic part abuts against the side plate.

[0014] As a preferred technical solution of the present invention, a first limit surface and a second limit surface are provided in the shell and are located on both sides of the handle. The first limit surface and the second limit surface are located on the rotation path of the handle, and the handle is respectively against the first limit surface or the second limit surface when it is in the closing position or the opening position.

[0015] To sum up, the beneficial effects of the present invention 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 offset 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 to achieve gap compensation. In addition, the last section of the closing action realizes energy storage based on the energy storage limiter, which can quickly break through the oxide between the moving and static contacts. During the closing process, the fast and stable closing will not produce arc erosion of the contacts, thereby improving the closing effect of the circuit breaker and extending the service life of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the front structure inside the housing of the circuit breaker of the present invention in the open state; Figure 2 It is a schematic diagram of the front structure inside the housing of the circuit breaker of the present invention when it is in the closed state; Figure 3 It is a schematic diagram of the back structure inside the housing of the circuit breaker of the present invention when the circuit breaker is in the open state; Figure 4 It is a schematic diagram of the back structure inside the housing of the circuit breaker of the present invention when it is in the closed state; Figure 5 yes Figure 3 Enlarged view of part A; Figure 6 yes Figure 4 Enlarged view of part B; Figure 7 yes Figure 1 Schematic diagram of the partial structure of the circuit breaker; Figure 8 yes Figure 2 Schematic diagram of the partial structure of the circuit breaker; Fig. 9 It is a schematic diagram of the structure of the circuit breaker housing in the present invention; Fig.10 It is a front structural schematic diagram of the handle, the moving contact support, and the lock in the present invention; Fig.11 It is a schematic diagram of the back structure of the handle, the moving contact support, and the lock in the present invention; Fig.12 It is an exploded view of the movable contact support and the lock catch in the present invention; Fig.13 It is a structural schematic diagram of the movable contact support member in the present invention; Fig.14 It is a schematic diagram of the structure of the lock in the present invention; Fig.15 It is a structural schematic diagram of the energy storage limiter in the present invention.

[0017] Figure numerals: 1, housing; 11, pin; 12, positioning column; 121, positioning hole; 13, first supporting surface; 14, second supporting surface; 15, thermal bimetallic strip; 16, installation area; 161, upper blocking portion; 162, lower blocking portion; 1621, limiting groove; 163, side plate; 17, first limiting surface; 18, second limiting surface; 2, handle; 21, mounting hole; 22, active area; 3, static contact support; 4, moving contact support; 41, oblong hole; 42, push portion; 43, sliding area; 431, first sliding hole; 432, second Sliding hole; 433, pressing surface; 44, moving contact; 45, locking position; 46, abutment portion; 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 area; 821, first locking hole; 822, second locking hole; 83, pull rod; 84, lock torsion spring; 85, convex ring; 9, energy storage limiter; 91, moving portion; 92, matching portion; 93, main body; 94, elastic portion; 941, elastic section; 9411, spherical limit block. DETAILED DESCRIPTION

[0018] 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 scope of protection of the present invention.

[0019] The specific embodiments of the present invention are described below with reference to the accompanying drawings.

[0020] like Figure 1-15 A quick closing operating mechanism of a circuit breaker shown in the figure comprises a housing 1, a handle 2, a static contact support 3, a moving contact support 4, a linkage member 5, an energy storage limit member 9 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 arranged on the moving contact support 4, and a pin shaft 11 is arranged in the housing 1 and the pin shaft 11 is penetrated in the oblong hole 41. The moving contact support 4 rotates relative to the pin shaft 11 and can 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.

[0021] 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. Rapid and stable closing during the closing process will not cause arc erosion of the contacts, thereby achieving gap compensation and ensuring the closing effect.

[0022] 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.

[0023] 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. 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 at intervals in the shell 1. 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. 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 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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 .

[0029] An installation area 16 is provided in the housing 1 and is located between the handle 2 and the moving contact support 4. The energy storage limiter 9 slides and is limited in the installation area 16. An active area 22 is provided on the handle 2. An abutment portion 46 is provided on the moving contact support 4. The energy storage limiter 9 has a moving portion 91 and a matching portion 92 limited in the active area 22. The matching portion 92 is located on the rotation path of the abutment portion 46 and the matching portion 92 is staggered after briefly abutting against the abutment portion 46 to store energy during the closing process of the handle 2. In this embodiment, the active area 22 is an oblong hole or an arc hole opened on the handle 2.

[0030] The matching part 92 of the energy storage limiter 9 and the abutment part 46 of the moving contact support 4 briefly contact to achieve good energy storage, without more accessories and simplified structure. In addition, the energy storage limiter 9 adopts a sliding manner, which can easily pull the matching part 92 away from the abutment part 46, and the short-term contact stored energy is released instantly to achieve fast closing, good closing feel, and easy and labor-saving; when the small circuit breaker is closed, the moving contact makes the moving contact and the static contact contact and close quickly and stably in an instant under the action of the handle 2; due to the effect of energy storage, no arc will be generated between the moving contact on the moving contact support 4 and the static contact on the static contact support 3 when closing, so that the moving and static contacts will not be burned by the arc when closing, and the service life is long.

[0031] The energy storage limiter 9 includes a main body 93, a movable part 91 and a matching part 92 located at both ends of the main body 93, and the energy storage limiter 9 also includes an elastic part 94 located below the main body 93. An upper blocking part 161 and a lower blocking part 162 are provided at a position corresponding to the installation area 16 in the shell 1. The energy storage limiter 9 slides and is limited between the upper blocking part 161 and the lower blocking part 162. The upper blocking part 161 is located above the main body 93, and the elastic part 94 is mounted on the lower blocking part 162.

[0032] The elastic portion 94 includes an arched elastic section 941, one end of which is fixedly connected to the main body 93, and the other end of the elastic section 941 serves as a movable end and is provided with a spherical limit block 9411. The lower blocking portion 162 is located on one side of the moving contact support 4 and is provided with a limit groove 1621. When the handle 2 is in the initial position of the open switch, the spherical limit block 9411 is inserted into the limit groove 1621.

[0033] A side plate 163 is disposed in the housing 1 at a position corresponding to the mounting area 16 . The side plate 163 is disposed close to one side of the handle 2 . When the handle 2 is in the closing position, one end of the elastic portion 94 abuts against the side plate 163 .

[0034] A first limit surface 17 and a second limit surface 18 are provided in the shell 1 on both sides of the handle 2. The first limit surface 17 and the second limit surface 18 are located on the rotation path of the handle 2. When the handle 2 is in the closing position or the opening position, it respectively abuts against the first limit surface 17 or the second limit surface 18.

[0035] 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 As shown in the back view of the housing 1, the pin shaft 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 shaft 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 shaft 11, such as Figure 4 , 6As 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, 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. The lock buckle 8 spring is compressed to store energy, and 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 431 of the lock buckle 8 When the holes 821 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, so as to quickly realize the opening of the switch and play a role in 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 a role in 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 8 spring is compressed and stores 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 moving The first sliding hole 431 of the 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 is shifted to the second sliding hole 432 of the moving contact support 4, so as to quickly realize the opening of the switch and play a role in short-circuit protection; when the handle 2 is in the initial opening position, the moving part 91 of the energy storage limiter 9 is located at the left end of the active area 22 and the spherical limit block 9411 is stuck in the limit groove 1621. In the process of the handle 2 from opening to closing, the abutting part 46 of the moving contact support 4 rotates to the bottom of the matching part 92 and abuts against the matching part 92. After a short stay of the moving contact support 4, the moving contact The head and the static contact are not in contact and there is still a distance between them. The handle 2 continues to be rotated until the right end of the active area 22 contacts the moving part 91, and the energy storage limiter 9 moves to the left to make the matching part 92 withdraw from the abutment part 46, and the handle 2 is quickly pushed forward to reach the closing position, thereby overcoming the influence of the different speeds of the manual operation of the handle 2 on the closing speed of the moving contact, improving the service life, and closing the switch easily and labor-savingly. Due to the effect of energy storage, no arc will be generated between the moving contact and the static contact when closing the switch, so that the moving and static contacts will not be burned by the arc when closing the switch. After adding the energy storage function, the moving contact has a certain impact force when it contacts and closes the switch under the action of energy storage, and cooperates with the pressing of the moving contact support 4 over the stroke, which can more effectively impact and destroy the oxide film burned by the arc.

[0036] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected, and the scope of the present invention to be protected is defined by the attached claims and their equivalents.

Claims

1. A quick closing operating mechanism for a circuit breaker, comprising a housing (1), a handle (2), a stationary contact support (3), a moving contact support (4), a linkage member (5), an energy storage limit member (9) and a tripping mechanism (6), wherein the handle (2) and the moving contact support (4) are rotatably arranged in the housing (1), two ends of the linkage member (5) are respectively linked with the handle (2) and the moving contact support (4), a contact torsion spring (7) is arranged between the housing (1) 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) rotates relative to the pin shaft (11); the housing (1) is provided with an installation area (16) located between the handle (2) and the moving contact support (4), the energy storage limiter (9) slides and is limited in the installation area (16), the handle (2) is provided with an active area (22), the moving contact support (4) is provided with an abutment portion (46), the energy storage limiter (9) has a moving portion (91) limited in the active area (22) and a matching portion (92), the matching portion (92) is located on the rotation path of the abutment portion (46), and the matching portion (92) is quickly offset after briefly abutting against the abutment portion (46) during the closing process of the handle (2).

2. The fast closing operating mechanism of the circuit breaker 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 fast closing operating mechanism of the circuit breaker 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 fast 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); 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); and the handle (2) is provided with a mounting hole (21) for inserting one end of the U-shaped connecting rod (51).

5. The fast 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).

6. The fast closing operating mechanism of the circuit breaker according to claim 5, 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).

7. The fast closing operating mechanism of the circuit breaker according to claim 1, characterized in that: The energy storage limiting component (9) comprises a main body (93), the movable portion (91) and the matching portion (92) are located at two ends of the main body (93), the energy storage limiting component (9) further comprises an elastic portion (94) located below the main body (93), an upper blocking portion (161) and a lower blocking portion (162) are arranged in the housing (1) at a position corresponding to the mounting area (16), the energy storage limiting component (9) slides and is limited between the upper blocking portion (161) and the lower blocking portion (162), the upper blocking portion (161) is located above the main body (93), and the elastic portion (94) is mounted on the lower blocking portion (162).

8. The fast closing operating mechanism of the circuit breaker according to claim 7, characterized in that: The elastic portion (94) comprises an arched elastic section (941), one end of the elastic section (941) is fixedly connected to the main body (93), the other end of the elastic section (941) serves as a movable end and is provided with a spherical limit block (9411), the lower blocking portion (162) is located on one side of the moving contact support (4) and is provided with a limit groove (1621), and the spherical limit block (9411) is inserted into the limit groove (1621) when the handle (2) is in the initial opening position.

9. The fast closing operating mechanism of the circuit breaker according to claim 8, characterized in that: A side plate (163) is provided in the housing (1) at a position corresponding to the mounting area (16); the side plate (163) is provided close to one side of the handle (2); and when the handle (2) is in the closing position, one end of the elastic portion (94) abuts against the side plate (163).

10. The fast closing operating mechanism of the circuit breaker according to claim 1, characterized in that: A first limiting surface (17) and a second limiting surface (18) are provided in the housing (1) and are located on both sides of the handle (2); the first limiting surface (17) and the second limiting surface (18) are located on the rotation path of the handle (2); and when the handle (2) is in the closing position or the opening position, it abuts against the first limiting surface (17) or the second limiting surface (18) respectively.

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