A quick close operating mechanism for a circuit breaker

Abstract

The application discloses a quick closing operation mechanism of a circuit breaker, which comprises a shell, a handle, a static contact support, a movable contact support, a linkage and a tripping mechanism, the handle and the movable contact support are rotationally arranged in the shell, a contact torsional spring is arranged between the shell and the movable contact support, a long circular hole is arranged on the movable contact support, a pin shaft is arranged in the shell and passes through the long circular hole, and the movable contact support rotates relative to the pin shaft; an installation area is arranged in the shell, an energy storage limiting piece is slidably arranged in the installation area, a movable area is arranged on the handle, an abutting portion is arranged on the movable contact support, the energy storage limiting piece is provided with a moving portion and a matching portion which are arranged in the movable area, the application can make the movable contact support move beyond the stroke, is not limited to a fixed point, improves the contact force, and based on the energy storage limiting piece, the last action of closing is realized to store energy, the oxides between the movable contact and the static contact can be quickly broken down, and the overall closing effect is improved.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker technology, and in particular to a fast closing operation mechanism for a circuit breaker. Background Technology

[0002] Circuit breaker: A mechanical switching device capable of connecting, carrying, and disconnecting current under normal circuit conditions, and also capable of connecting, carrying, and automatically disconnecting current for a certain period of time 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 continuity of the electrical circuit; when a circuit fault causes a short-circuit current or an overload causes an overcurrent, it isolates the electrical load from the power supply network.

[0003] Circuit breakers used for a long time, especially after repeated closing and opening operations, may experience wear, oxidation, or aging of the contacts, resulting in uneven contact surfaces. Even during closing, tiny gaps may exist between the contacts. If oxides or other contaminants are present on the contact surfaces of the stationary and moving contacts, these oxides or contaminants may affect the contact between the contacts. Especially when high current flows, oxides may be burned off, leading to gap formation. Furthermore, the varying speed of manual operation of the handle affects the closing speed of the moving contact. During closing, an electric arc may be generated between the moving and stationary contacts, causing them to be burned. All of these factors will affect the closing effect. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a fast closing operation mechanism for a circuit breaker.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a fast closing operation mechanism for a circuit breaker, comprising a housing, a handle, a stationary contact support, a moving contact support, a linkage component, an energy storage limiting component, and a tripping mechanism. The handle and the moving contact support are rotatably disposed within the housing. The two ends of the linkage component are respectively linked to the handle and the moving contact support. A contact torsion spring is disposed between the housing and the moving contact support. An elongated hole is provided on the moving contact support. A pin is disposed within the housing and passes through the elongated hole. The moving contact support rotates relative to the pin. An installation area is provided within the housing between the handle and the moving contact support. The energy storage limiting component slides and is limited within the installation area. A movable area is provided on the handle. An abutment portion is provided on the moving contact support. The energy storage limiting component has a movable portion limited within the movable area and a mating portion. The mating portion is located on the rotation path of the abutment portion, and the mating portion briefly abuts the abutment portion during the handle closing process and then quickly disengages.

[0006] As a preferred embodiment of the present invention, a positioning post is provided inside the housing corresponding to the pin position, and a positioning hole for the pin to be inserted is provided inside the positioning post.

[0007] As a preferred embodiment of the present invention, the positioning post is fitted with a contact torsion spring, and the housing is provided with a first support surface and a second support surface at intervals. The contact torsion spring has two torsion ends and a second torsion end respectively mounted on the first support surface and the second support surface. The first torsion end and the second torsion end are limited to the movable space formed between the first support surface and the second support surface. The moving contact support is provided with a pusher that can drive the first torsion end of the contact torsion spring to twist towards the second torsion end to store energy in the closed state.

[0008] As a preferred embodiment of the present invention, the moving contact support is provided with a sliding area, the linkage 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 latch for locking one end of the U-shaped connecting rod to 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 embodiment of the present invention, the latch swings relative to the moving contact support and has a through hole corresponding to the elongated hole. The pin passes through the elongated hole of the moving contact support and the through hole of the latch in sequence. The latch has a locking area that is adapted to the shape of the sliding area and corresponds to its position. A latch torsion spring is provided between the latch and the moving contact support to deflect the locking area relative to the sliding area to form a locking position. One end of the U-shaped connecting rod is limited to the locking position.

[0010] As a preferred embodiment of the present invention, the sliding area includes a first sliding hole and a second sliding hole that are staggered and interconnected, and the locking area 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 embodiment of the present invention, the energy storage limiting member includes a main body, the movable part and the mating part are located at both ends of the main body, the energy storage limiting member also includes an elastic part located below the main body, an upper blocking part and a lower blocking part are provided in the housing corresponding to the installation area, the energy storage limiting member 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 rests on the lower blocking part.

[0012] As a preferred embodiment of the present invention, the elastic part includes an arched elastic segment, one end of which is fixedly connected to the main body, and the other end of which serves as a movable end with a spherical limiting block. The lower blocking part is provided with a limiting groove on one side of the moving contact support member, and the spherical limiting block is inserted into the limiting groove when the handle is in the initial opening position.

[0013] As a preferred embodiment of the present invention, a side plate is provided inside the housing corresponding to the installation area. The side plate is located near the handle, and when the handle is in the closed position, one end of the elastic part abuts against the side plate.

[0014] As a preferred embodiment of the present invention, the housing is provided with a first limiting surface and a second limiting surface located on both sides of the handle. The first limiting surface and the second limiting surface are located on the rotation path of the handle. When the handle is in the closed or open position, it abuts against the first limiting surface or the second limiting surface, respectively.

[0015] In summary, the beneficial effects of this invention are as follows: the elongated hole on the moving contact support, in conjunction with the housing pin, 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 pressed towards the stationary contact support (stationary contact). The elongated hole slightly deviates relative to the pin, and the over-travel compression can improve the contact force between the moving and stationary contacts, break down the oxides between the stationary and moving contacts, and achieve gap compensation. Furthermore, the final closing action, based on the energy storage limiter, can quickly break down the oxides between the moving and stationary contacts. During the closing process, rapid and stable closing will not produce arc erosion of the contacts, improving the circuit breaker's closing effect and extending the product's service life. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the front structure inside the casing of the circuit breaker in the open state of the present invention;

[0017] Figure 2 This is a schematic diagram of the internal front structure of the circuit breaker housing in the closed state of the present invention;

[0018] Figure 3 This is a schematic diagram of the internal rear structure of the circuit breaker housing in the open state of the present invention;

[0019] Figure 4 This is a schematic diagram of the internal rear structure of the circuit breaker housing in the closed state of the present invention;

[0020] Figure 5 yes Figure 3 A magnified view of part A;

[0021] Figure 6 yes Figure 4 A magnified view of part B;

[0022] Figure 7 yes Figure 1 A partial structural diagram of the circuit breaker;

[0023] Figure 8 yes Figure 2 A partial structural diagram of the circuit breaker;

[0024] Figure 9 This is a schematic diagram of the structure of the circuit breaker housing of the present invention;

[0025] Figure 10 This is a front structural diagram of the handle, moving contact support, and latch in this invention;

[0026] Figure 11 This is a schematic diagram of the back structure of the handle, moving contact support, and latch in this invention;

[0027] Figure 12 This is an exploded view of the moving contact support and the latch in this invention;

[0028] Figure 13 This is a schematic diagram of the moving contact support component in this invention;

[0029] Figure 14 This is a schematic diagram of the locking mechanism in this invention;

[0030] Figure 15 This is a schematic diagram of the energy storage limiting component in this invention.

[0031] Reference numerals: 1. Housing; 11. Pin; 12. Positioning pin; 121. Positioning hole; 13. First support surface; 14. Second support surface; 15. Bimetallic strip; 16. Mounting area; 161. Upper blocking part; 162. Lower blocking part; 1621. Limiting groove; 163. Side plate; 17. First limiting surface; 18. Second limiting surface; 2. Handle; 21. Mounting hole; 22. Movable area; 3. Stationary contact support; 4. Moving contact support; 41. Elongated hole; 42. Pushing part; 43. Sliding area; 431. First sliding hole; 432. Second... 433. Sliding hole; 44. Pressing surface; 45. Moving contact; 46. Locking position; 47. Abutting part; 5. Linkage component; 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. Protruding ring; 9. Energy storage limiting component; 91. Moving part; 92. Mating part; 93. Main body part; 94. Elastic part; 941. Elastic segment; 9411. Spherical limiting block. Detailed Implementation

[0032] To make the technical means, creative features, achieved objectives, and effects of this invention easier to understand, the invention is further described below with reference to specific embodiments and accompanying drawings. However, the following embodiments are merely preferred embodiments of this invention and not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention.

[0033] Specific embodiments of the present invention are described below with reference to the accompanying drawings.

[0034] like Figure 1-15 The circuit breaker quick-closing operation mechanism shown includes a housing 1, a handle 2, a stationary contact support 3, a moving contact support 4, a linkage 5, an energy storage limiter 9, and a tripping mechanism 6. The handle 2 and the moving contact support 4 are rotatably disposed within the housing 1. The two ends of the linkage 5 are respectively linked to the handle 2 and the moving contact support 4. The moving contact support 4 is provided with an elongated hole 41. A pin 11 is provided inside the housing 1 and passes through the elongated hole 41. The moving contact support 4 can rotate relative to the pin 11 to cooperate with the stationary contact support 3 to realize opening and closing. The tripping mechanism 6 in this embodiment is prior art and therefore is not described in detail.

[0035] The moving contact support 4 is provided with an elongated hole 41 to cooperate with the pin 11. It 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 pressed towards the stationary contact support 3 (stationary contact). The elongated hole 41 is slightly deflected relative to the pin 11. The over-travel compression can improve the contact force between the moving and stationary contacts and can break through the oxide between the stationary contact and the moving contact 44. During the closing process, the fast and stable closing will not produce arc burning of the contact, realize gap compensation, and ensure the closing effect.

[0036] The circuit breaker opening and closing mechanism of this scheme has a simple structure, streamlined parts, relatively low manufacturing cost, and high production efficiency. In addition, the mechanism design increases the distance between the moving contact and the stationary contact of the circuit breaker. The larger the distance, the more beneficial it is to interrupt the arc. After streamlining the parts, the breaking time is shortened, the short-circuit breaking capacity is improved, and the short-circuit breaking capacity is more stable.

[0037] A positioning post 12 is provided inside the housing 1 at the position corresponding to the pin 11. The positioning post 12 is provided with a positioning hole 121 for the pin 11 to be inserted. A contact torsion spring 7 is provided on the outer sleeve of the positioning post 12. A first support surface 13 and a second support surface 14 are provided at intervals inside the housing 1. The contact torsion spring 7 has two torsion ends 71 ​​and 72 respectively mounted on the first support surface 13 and the second support surface 14. The first torsion ends 71 ​​and 72 are limited to the movable space formed between the first support surface 13 and the second support surface 14. The moving contact support member 4 is provided with a push part 42 that can drive the first torsion end 71 of the contact torsion spring 7 to twist towards the second torsion end 72 to store energy in the closed state.

[0038] The moving contact support 4 is provided with a sliding area 43, and the linkage 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. The moving contact support 4 is provided with a latch 8 for locking one end of the U-shaped connecting rod 51 to one end of the sliding area 43. The handle 2 is provided with a mounting hole 21 for inserting one end of the U-shaped connecting rod 51.

[0039] The latch 8 swings relative to the moving contact support and has a through hole 81 corresponding to the elongated hole 41. The pin 11 passes through the elongated hole 41 of the moving contact support 4 and the through hole 81 of the latch 8 in sequence. The latch 8 has a locking area 82 that is adapted to the shape and position of the sliding area 43. A latch torsion spring 84 is provided between the latch 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 to the locking position 45.

[0040] The sliding area 43 includes a first sliding hole 431 and a second sliding hole 432 that are staggered and interconnected. The locking area 82 includes a first locking hole 821 and a second locking hole 822 that are staggered and interconnected. A pressing surface 433 is provided between the first sliding hole 431 and the second sliding hole 432. A locking position 45 is formed between the inner wall of the first locking hole 821 and the pressing surface 433.

[0041] The latch 8 is provided with a convex ring 85 coaxially arranged with the through hole 81. The latch torsion spring 84 is sleeved on the convex ring 85. The two torsional ends of the latch torsion spring 84 are respectively fixed on the moving contact support 4 and the latch 8. When the latch 8 swings relative to the moving contact support 4, the latch torsion spring 84 stores energy and the hole positions of the locking area 82 and the sliding area 43 correspond.

[0042] A bimetallic strip 15 is provided inside the housing 1, and a pull rod 83 is provided on the latch 8, with the lower end of the pull rod 83 corresponding to the bimetallic strip 15.

[0043] The housing 1 has an installation area 16 located between the handle 2 and the moving contact support 4. The energy storage limiter 9 slides and is limited within the installation area 16. The handle 2 has an active area 22. The moving contact support 4 has an abutment part 46. The energy storage limiter 9 has a moving part 91 limited within the active area 22 and a mating part 92. The mating part 92 is located on the rotation path of the abutment part 46. The mating part 92 briefly abuts the abutment part 46 to store energy during the closing process of the handle 2 and then moves away. In this embodiment, the active area 22 is an elongated hole or an arc-shaped hole opened on the handle 2.

[0044] The brief contact between the mating part 92 of the energy storage limiter 9 and the abutment part 46 of the moving contact support 4 enables good energy storage, requiring no additional accessories and simplifying the structure. In addition, the energy storage limiter 9 adopts a sliding mechanism, which allows the mating part 92 to be easily pulled away from the abutment part 46. The energy stored during the brief contact is released instantly, achieving rapid closing. The closing feel is good and easy to operate. When the miniature circuit breaker is closed, the moving contact, under the action of the handle 2, makes the moving contact and the stationary contact make rapid and stable contact and close the circuit instantly. Due to the energy storage effect, no electric arc is generated between the moving contact on the moving contact support 4 and the stationary contact on the stationary contact support 3 during closing, so that the moving and stationary contacts are not burned by the electric arc during closing, resulting in a long service life.

[0045] The energy storage limiting member 9 includes a main body 93, a movable part 91 and a mating part 92 located at both ends of the main body 93. The energy storage limiting member 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 in the housing 1 corresponding to the installation area 16. The energy storage limiting member 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 rests on the lower blocking part 162.

[0046] The elastic part 94 includes 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 limiting block 9411. The lower blocking part 162 is located on one side of the moving contact support 4 and is provided with a limiting groove 1621. When the handle 2 is in the initial opening position, the spherical limiting block 9411 is inserted into the limiting groove 1621.

[0047] A side plate 163 is provided inside the housing 1 at the position corresponding to the installation area 16. The side plate 163 is located on the side close to the handle 2. When the handle 2 is in the closed position, one end of the elastic part 94 abuts against the side plate 163.

[0048] The housing 1 is provided with a first limiting surface 17 and a second limiting surface 18 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. When the handle 2 is in the closed or open position, it abuts against the first limiting surface 17 or the second limiting surface 18 respectively.

[0049] Working principle: The locking position 45 formed by the locking area 82 of the latch 8 and the sliding area 43 of the moving contact support 4 can fix one end of the U-shaped connecting rod 51. When the handle 2 is in the initial open position, such as Figure 3 , 5 The diagram shows the rear view of housing 1. At this point, pin 11 is at the left end of the elongated hole 41. When the manual control handle 2 is closed, the elongated hole 41 of the moving contact support 4 will be offset relative to pin 11 towards the middle position or move to the other end of the elongated hole 41. This is due to the pressure applied during the over-stroke (because the elongated hole 41 will be offset relative to pin 11, such as...). Figure 4 , 6As shown, when viewed from the front of the housing 1 during the closing operation, the moving contact of the moving contact support 4 will move further closer to the stationary contact, increasing the contact force between the contacts. This can break down the oxide between the stationary and moving contacts, while also achieving 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 and passive layers, the hot bimetallic strip 15 will bend towards the passive layer side, pushing the lower end of the pull rod 83 to cause the latch 8 to deflect relative to the moving contact support 4. The latch 8 spring is compressed and stores energy, and one end of the U-shaped connecting rod 51 can disengage 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 of the latch 8... When hole 821 is 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 moves into the second sliding hole 432 of the moving contact support 4, quickly achieving tripping and providing overload protection. If a short-circuit current occurs during operation, the magnetic field generated by the coil in the trip unit will instantly increase, becoming large enough to attract the moving iron core. At this time, the push rod connected to the moving iron core will push the locking device 8 to disconnect the product and provide short-circuit protection. Specifically, the push rod touches the locking device 8, causing it to deflect relative to the moving contact support 4. The locking device 8 spring is compressed and stores energy. One end of the U-shaped connecting rod 51 can disengage from the locking position 45 under the action of the contact torsion spring 7. Specifically, the moving iron core... When the first sliding hole 431 of the contact support 4 and the first locking hole 821 of the latch 8 are adjusted to be parallel or nearly parallel, 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 moves into the second sliding hole 432 of the moving contact support 4, quickly realizing the opening and playing the role of short circuit protection. When the handle 2 is in the initial opening position, the moving part 91 of the energy storage limit member 9 is located at the left end of the active area 22 and the spherical limit block 9411 is inserted into the limit groove 1621. During the process of the handle 2 from opening to closing, the abutting part 46 of the moving contact support 4 rotates to below the mating part 92 and abuts against the mating part 92. After a brief pause, the moving contact support 4 then... The head and stationary contact are not in contact and still maintain a distance. Continue to rotate the handle 2 until the right end of the moving area 22 contacts the moving part 91. Then, the energy storage limit member 9 moves to the left, causing the mating part 92 to be pulled away from the abutment part 46. The handle 2 is quickly pushed forward to the closing position, thereby overcoming the influence of the varying speed of the moving contact on the closing speed of the manual operation handle 2, improving service life, and making closing easy and effortless. Due to the energy storage function, no electric arc is generated between the moving contact and the stationary contact when closing, so that the moving and stationary contacts will not be burned by the electric arc. After adding the energy storage function, the moving contact has a certain impact force when it contacts the stationary contact for closing under the energy storage function. With the over-stroke pressing of the moving contact support member 4, it can more effectively impact and destroy the oxide film burned by the electric arc.

[0050] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as defined by the appended claims and their equivalents.

Claims

1. A fast closing operation mechanism for a circuit breaker, comprising a housing (1), a handle (2), a stationary contact support (3), a moving contact support (4), a linkage (5), an energy storage limiter (9), and a tripping mechanism (6), wherein the handle (2) and the moving contact support (4) are rotatably disposed within the housing (1), and both ends of the linkage (5) are respectively linked to the handle (2) and the moving contact support (4), and a contact torsion spring (7) is provided between the housing (1) and the moving contact support (4), characterized in that: The moving contact support (4) is provided with an elongated hole (41), and a pin (11) is provided inside the housing (1) and passes through the elongated hole (41). The moving contact support (4) rotates relative to the pin (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 within the installation area (16). The handle (2) is provided with an active area (22). The moving contact support (4) is provided with an abutment (46). The energy storage limiter (9) has a moving part (91) limited within the active area (22) and a mating part (92). The mating part (92) is located on the rotation path of the abutment (46), and the mating part (92) briefly abuts the abutment (46) and then quickly moves away during the closing process of the handle (2). A positioning post (12) is provided inside the housing (1) corresponding to the position of the pin (11). The positioning post (12) is provided with a positioning hole (121) for the pin (11) to be inserted. A contact torsion spring (7) is provided on the outer sleeve of the positioning post (12). A first support surface (13) and a second support surface (14) are provided at intervals inside the housing (1). The contact torsion spring (7) has two torsion ends (71) and a second torsion end (72) respectively mounted on the first support surface (13) and the second support surface (14). The first torsion end (71) and the second torsion end (72) are limited to the movable space formed between the first support surface (13) and the second support surface (14). The moving contact support member (4) is provided with a push part (42) that can drive the first torsion end (71) of the contact torsion spring (7) to twist and store energy towards the second torsion end (72) in the closed state. The energy storage limiting member (9) includes a main body (93), the moving part (91) and the mating part (92) are located at both ends of the main body (93), the energy storage limiting member (9) also includes an elastic part (94) located below the main body (93), the housing (1) is provided with an upper blocking part (161) and a lower blocking part (162) corresponding to the installation area (16), the energy storage limiting member (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) rests on the lower blocking part (162); The elastic part (94) includes 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 limiting block (9411). The lower blocking part (162) is located on one side of the moving contact support (4) and is provided with a limiting groove (1621). When the handle (2) is in the initial position of opening the circuit breaker, the spherical limiting block (9411) is inserted into the limiting groove (1621).

2. The fast closing operation mechanism of the circuit breaker according to claim 1, characterized in that: The moving contact support (4) is provided with a sliding area (43), the linkage (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). The moving contact support (4) is provided with a latch (8) for locking one end of the U-shaped connecting rod (51) to one end of the sliding area (43). The handle (2) is provided with a mounting hole (21) for inserting one end of the U-shaped connecting rod (51).

3. The fast closing operation mechanism of the circuit breaker according to claim 2, characterized in that: The latch (8) swings relative to the moving contact support and the latch (8) is provided with a through hole (81) corresponding to the elongated hole (41). The pin (11) passes through the elongated hole (41) of the moving contact support (4) and the through hole (81) of the latch (8) in sequence. The latch (8) is provided with a locking area (82) that is adapted to the shape of the sliding area (43) and corresponds to its position. A latch torsion spring (84) is provided between the latch (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 to the locking position (45).

4. The fast closing operation mechanism of the circuit breaker according to claim 3, characterized in that: The sliding area (43) includes a first sliding hole (431) and a second sliding hole (432) that are staggered and interconnected. The locking area (82) includes a first locking hole (821) and a second locking hole (822) that are staggered and interconnected. A pressing surface (433) is provided between the first sliding hole (431) and the second sliding hole (432). The locking position (45) is formed between the inner wall of the first locking hole (821) and the pressing surface (433).

5. The fast closing operation mechanism of the circuit breaker according to claim 1, characterized in that: A side plate (163) is provided inside the housing (1) at the position corresponding to the installation area (16). The side plate (163) is located near the handle (2). When the handle (2) is in the closed position, one end of the elastic part (94) abuts against the side plate (163).

6. The fast closing operation mechanism of the circuit breaker according to claim 1, characterized in that: The housing (1) is provided with a first limiting surface (17) and a second limiting surface (18) 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). When the handle (2) is in the closed or open position, it abuts against the first limiting surface (17) or the second limiting surface (18) respectively.

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