A multi-spacing breaking structure and circuit breaker

Abstract

The present application discloses a multi-opening distance breaking structure and a circuit breaker. The multi-opening distance breaking structure includes a moving contact, a static contact, a rotating shaft, a contact spring, a moving contact shaft, a first contact spring shaft, and a second contact spring shaft. The contact spring is hung between the first contact spring shaft and the second contact spring shaft. During the breaking process of the moving contact, the reverse torque of the contact spring on the moving contact is reduced, and there are three positions: a repulsive position, a tripping position, and a switching position. The repulsive opening distance between the contact surface of the far-axis end of the moving contact and the contact surface of the static contact is greater than the switching opening distance, and the switching opening distance is greater than the tripping opening distance. The moving contact is provided with an arc extinguishing angle, and the outer edge of the arc extinguishing angle is parallel to the bending surface of the arc striking piece. The present application solves the problems of poor breaking capacity improvement and poor reliability of the backup protection structure within a specific space of the prior art, and achieves the beneficial effect of effectively improving the arc extinguishing capacity and the breaking capacity without increasing the length of the circuit breaker.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment, and in particular to a multi-spacing breaking structure and a circuit breaker. Background Art

[0002] In the field of electrical equipment, specifically low-voltage electrical appliances, molded case circuit breakers (MCCBs), as a commonly used electrical component for circuit protection, are particularly important. Among various types of protection, the short-circuit breaking capacity of a MCCB is a crucial factor. Factors influencing the short-circuit breaking capacity of a MCCB include the maximum distance between the breaker's moving and static contacts when they open, the speed at which the moving and static contacts separate, and the arc-extinguishing capacity of the arc extinguishing chamber. The maximum distance between the moving and static contacts when the breaker opens is called the opening distance.

[0003] Currently, there are two types of opening distances for molded case circuit breakers: one is the opening distance when the molded case circuit breaker mechanism trips, and the other is the opening distance when the molded case circuit breaker mechanism opens. Generally speaking, the tripping opening distance of a single-breakpoint molded case circuit breaker is greater than the opening opening distance. This is to increase the opening distance during short-circuit protection of the molded case circuit breaker and improve the breaking performance. For a double-breakpoint molded case circuit breaker, the opening opening distance is usually equal to the tripping opening distance. However, whether it is a single-breakpoint or double-breakpoint mechanism, the opening distance of the product depends on the angle of rotation of the tripping button when the mechanism trips. This means that within a certain space, if the length of the mechanism is not lengthened, that is, the length of the molded case circuit breaker is not increased, it is basically impossible to increase the product opening distance. This results in the inability to utilize the key characteristic of the opening distance when improving the breaking capacity of the circuit breaker, resulting in limited improvement in the product's breaking performance.

[0004] The short-circuit protection function of a general molded case circuit breaker is usually achieved through backup protection, which is generally divided into two types: magnetic backup protection and gas backup protection. For example, the patent document with the authorization announcement number CN219226180U discloses an electronic circuit breaker back protection structure, including a base, a traction rod and three-phase partitions A, B, and C arranged in sequence on the base, and backup protection trippers are installed in the three-phase partitions A, B, and C. Both backup protections are tripped by a trigger mechanism, and the main spring drives the trip button to rotate, and drives the rotation shaft to rotate through the upper and lower connecting rods, thereby driving the moving contact to separate from the static contact. The above two backup protection functions can reduce the separation time of the moving and static contacts of the molded case circuit breaker to a certain extent, but it is inevitable to rely on the mechanism to drive the rotation of the rotating shaft to achieve the maximum opening distance of the moving and static contacts. In addition, due to the complex structure of some current backup protection devices, there is still a jamming phenomenon during the test process, which will cause the test to fail. Summary of the Invention

[0005] In response to the deficiencies of the prior art, the present application provides a multi-spacing molded case circuit breaker to solve the problems of poor breaking capacity within a specific space and poor reliability of the backup protection structure in the prior art.

[0006] To achieve the above objectives, this application is implemented through the following technical solutions:

[0007] A multi-opening distance disconnecting structure includes a moving contact, a static contact, and a rotating shaft, a contact spring, a moving contact shaft, a first contact spring shaft, and a second contact spring shaft. The rotating shaft and the center of the moving contact are both provided with a moving contact shaft hole. The moving contact shaft passes through the coaxial rotating shaft and the moving contact. When the distal end of the moving contact is closed, it is closed with the static contact. The rotating shaft includes parallel and coaxial wheel surfaces. A space for accommodating the moving contact is formed between the wheel surfaces. The moving contact moves between the wheel surfaces. The wheel surfaces are connected by a connecting beam that is symmetrical with respect to the contact axis at the distal end. The first contact spring shaft and the second contact spring shaft are connected between the two wheel surfaces through an axis hole. One end of the contact spring is hung on the first contact spring shaft, and the other end is hung on the second contact spring shaft. The first contact spring shaft and the second contact shaft of the same group The axial holes of the spring shaft are on the upper and lower sides of the same moving contact arm, the first contact spring shaft is fixedly connected to the wheel surface through a circular axial hole, and the second contact spring shaft is slidingly connected to the wheel surface through a waist-shaped axial hole, the circular axial hole and the static contact are on the same side of the same moving contact arm, and the waist-shaped axial hole and the static contact are on the opposite side of the same moving contact arm, and the moving contact arm is provided with a follow-up curve on the edge of one side of the waist-shaped axial hole. During the rotation of the moving contact, the second contact spring shaft follows the follow-up curve of the moving contact arm and drives the rotating shaft to rotate, and the moving contact has three positions during the rotation process: the repulsive position, the tripping position and the opening position, wherein the distances between the contact surface of the far-axial end of the moving contact and the contact surface of the static contact are respectively the repulsive opening distance, the tripping opening distance and the opening distance, and the repulsive opening distance is greater than the tripping opening distance.

[0008] Preferably, a protrusion is provided on the outer side of the rotating shaft wheel surface.

[0009] Preferably, there are two static contacts and they are symmetrical with respect to the moving contact axis, and the moving contact has two symmetrical distal ends.

[0010] Preferably, the moving contact shaft hole of the moving contact is a waist-shaped hole.

[0011] Preferably, silver dots are installed between the contact surfaces of the moving contact and the static contact.

[0012] Preferably, the distal end of the moving contact further extends an arc striking angle outward from the opposite arm of the static contact, and the outer edge of the arc striking angle coincides with the motion trajectory of the distal end of the moving contact.

[0013] Based on the same inventive concept, the present application also discloses a circuit breaker, comprising a mechanism side plate and a body assembled together, wherein the mechanism side plate is mounted and fixed on the upper outer side of the body, and further comprises an electromagnetic tripping structure, an arc extinguishing chamber structure and the above-mentioned multi-spacing disconnecting structure and a lever, a handle, a tripping catch, a lower connecting rod, an outer connecting rod, and a connecting plate. The arc extinguishing chamber structure and the main body of the multi-spacing disconnecting structure are all arranged inside the body, a through hole is provided on the connecting beam of the rotating shaft, the tripping catch is rotatably mounted on the mechanism side plate through the tripping catch shaft, the handle is fixedly mounted on the top of the lever, and the lever is rotatably mounted on the mechanism side plate through the lever shaft, the far-end of the tripping catch is locked with the electromagnetic tripping structure, the middle part of the tripping catch is connected to one end of the lower connecting rod through the connecting plate, the other end of the lower connecting rod is simultaneously connected to the through hole of the connecting beam and the far-end of the outer connecting rod, the lower connecting rod and the outer connecting rod are both outside the body, the outer connecting rod is fixed to the lower part of the mechanism side plate through the outer connecting rod shaft, and the outer connecting rod rotates around the outer connecting rod shaft when the rotating shaft rotates.

[0014] Preferably, it includes the aforementioned multi-opening distance disconnecting structure, the arc extinguishing chamber structure includes an arc striking piece, a plurality of arc extinguishing grids and an arc extinguishing bracket, a plurality of the arc extinguishing grids are regularly arranged and installed on the arc extinguishing bracket, the end of the arc extinguishing grid corresponding to the moving contact repelling position is provided with an arc striking piece parallel to the arc extinguishing grid, the end of the arc striking piece facing the moving contact is provided with a bend toward the arc extinguishing grid, a plurality of the arc extinguishing grids are provided with arc grooves in the direction toward the moving contact to form a space to accommodate the moving contact from the closing position to the repelling position and to accommodate the bending of the arc striking piece, and the surface of the bend facing the moving contact is parallel to the outer edge of the arc striking angle.

[0015] Preferably, the outer connecting rod is located outside the side plate of the mechanism, and an avoidance groove is formed on the side surface of the housing and the side plate of the mechanism along the rotation trajectory of the distal end of the outer connecting rod.

[0016] Preferably, the electromagnetic tripping structure includes an armature, a traction rod, a three-level lock, a two-level lock, and a first-level lock. When the switch is closed, the first-level lock locks the distal end of the tripping lock, the second-level lock locks the distal end of the first-level lock, and the traction rod locks the third-level lock; when tripping, the armature rotates counterclockwise to hit the traction rod, and the traction rod rotates clockwise to release the third-level lock, the third-level lock rotates counterclockwise to push the second-level lock to rotate clockwise, the second-level lock rotates clockwise to release the first-level lock, and the first-level lock rotates clockwise to release the tripping lock.

[0017] Compared with the existing technology, the beneficial effect of this solution is that: this solution utilizes the unique current-limiting properties of the moving contact of the molded case circuit breaker, and proposes a molded case circuit breaker with an increased repulsive opening distance and no backup protection structure, thereby focusing on optimizing the opening distance of the molded case circuit breaker and the separation speed of the moving and static contacts. The circuit breakers of the existing technology currently only have a tripping opening distance and a release opening distance. The unoptimized release opening distance is greater than the tripping opening distance. After optimization, the release opening distance can be equal to the tripping opening distance. The so-called repulsive opening distance added in this application is another type of opening distance different from the tripping opening distance and the release opening distance, and the repulsive opening distance is greater than the release opening distance. That is, when the molded case circuit breaker shaft is not moving, the moving contact can be rotated to the distance between the moving and static contacts when it is at the farthest position from the static contact under the action of the electric repulsive force. In addition, during the contact repulsion process, the rotational torque of the contact spring on the moving contact will not increase, thereby ensuring the speed and stability of the moving contact repulsion. Therefore, the molded case circuit breaker of this solution can first maximize the opening distance of the short-circuit protection process while only increasing the height of the molded case circuit breaker without increasing the length of the circuit breaker. It can achieve the same installation size of the existing product, but greatly improve the breaking performance. It can minimize the cost increase of components and complete equipment brought about by the performance improvement; secondly, it greatly reduces the time it takes for the molded case circuit breaker to break the short-circuit current, improves the life of the arc extinguishing chamber and contacts of the molded case circuit breaker, and basically ensures that the rated ultimate short-circuit breaking capacity of the molded case circuit breaker is equal to the rated operating breaking capacity, that is, I cu = I cs; thirdly, since this solution eliminates the backup protection mechanism, it can completely avoid the phenomenon of the molded case circuit breaker being unable to close due to the jamming of the backup protection mechanism. The elimination of the backup protection mechanism can further simplify the structure of the molded case circuit breaker and reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a three-dimensional schematic diagram of an embodiment of the circuit breaker of the present application in the closed position;

[0019] Figure 2 This is a schematic top view of an embodiment of the circuit breaker of the present application in the closed position;

[0020] Figure 3 This is a cross-sectional view of the AA closed position of an embodiment of the circuit breaker of the present application;

[0021] Figure 4 1 is a cross-sectional view of an embodiment of the circuit breaker of the present application at the AA open position;

[0022] Figure 5 This is a cross-sectional view of the AA tripping position of an embodiment of the circuit breaker of the present application;

[0023] Figure 6 This is a cross-sectional view of an embodiment of the circuit breaker of the present application at the AA open position;

[0024] Figure 7This is a schematic diagram of the three-dimensional structure of the components near the rotating shaft of an embodiment of the circuit breaker of the present application;

[0025] Figure 8 This is a schematic diagram of the three-dimensional structure of the hidden base and one side of the housing of an embodiment of the circuit breaker of the present application;

[0026] Among them, 1-armature, 2-traction rod, 3-three-stage lock, 3a-three-stage lock shaft, 4-secondary lock, 5-first-stage lock, 6-jump buckle, 7-lower connecting rod, 8-rotating shaft, 81-protrusion, 82-connecting beam, 9-moving contact, 91-arc striking angle, 10-static contact, 11-contact spring, 12-moving contact shaft, 13-armature shaft, 14-traction rod shaft, 15-secondary lock shaft, 16-first Level locking shaft, 17-first contact spring shaft, 18-second contact spring shaft, 19-silver point, 20-outer connecting rod, 21-mechanism side plate, 22-housing, 23-roller, 24-rivet, 25-arc striking piece, 26-tripping shaft, 27-handle, 28-lever, 29-connecting plate, 30-arc extinguishing grid, 31-arc extinguishing bracket, D1-repulsion opening distance, D2-tripping opening distance, D3-opening distance. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] This embodiment provides a technical solution: This solution discloses a multi-opening distance breaking structure, including a moving contact 9, a static contact 10, a rotating shaft 8, a contact spring 11, a moving contact shaft 12, a first contact spring shaft 17, and a second contact spring shaft 18. The rotating shaft 8 and the moving contact 9 are both provided with a moving contact shaft hole in the center. The moving contact shaft 12 passes through the coaxial rotating shaft 8 and the moving contact 9. When the far-end of the moving contact 9 is closed, it closes with the static contact 10. The rotating shaft 8 includes parallel and coaxial wheel surfaces. , a space for accommodating the moving contact 9 is formed between the wheel surfaces, and the moving contact 9 moves between the wheel surfaces, and the wheel surfaces are connected by a connecting beam 82 which is symmetrical with respect to the contact axis 12 at the far axis end. The first contact spring axis 17 and the second contact spring axis 18 are connected between the two wheel surfaces through an axis hole, and one end of the contact spring 11 is hung on the first contact spring axis 17, and the other end is hung on the second contact spring axis 18. The axis holes of the first contact spring axis 17 and the second contact spring axis 18 of the same group are on the upper and lower sides of the same moving contact 9 arm, the first contact spring axis 17 is fixedly connected to the wheel surface through a circular axis hole, and the second contact spring axis 18 is slidably connected to the wheel surface through a waist-shaped axis hole, the circular axis hole and the static contact 10 are on the same side of the same moving contact 9 arm, and the waist-shaped axis hole and the static contact 10 are on the opposite side of the same moving contact 9 arm, and a following curve is provided on the edge of one side of the waist-shaped axis hole of the moving contact 9 arm, and during the rotation of the moving contact 9, the second contact spring axis 18 and the moving contact 9 arm are in contact with each other. The following curve follows and drives the rotating shaft 8 to rotate, and the moving contact 9 has three positions during the rotation process: the repulsive position, the tripping position, and the opening position. The distances between the contact surface of the far-end of the moving contact 9 and the contact surface of the static contact 10 are the repulsive distance D1, the tripping distance D2, and the opening distance D3, respectively. The repulsive distance D1 is greater than the opening distance D3. In this embodiment, the opening distance D3 is basically equal to the tripping distance D2. Under normal circumstances, the opening distance D3 can also be slightly smaller than the tripping distance D2. In this embodiment, since the moving contact 9 is plate-shaped throughout, two pairs of contact springs 11 are symmetrically arranged between the moving contact 9 and the wheel surfaces of the rotating shaft 8 on both sides. Including the contact springs 11 on the opposite side of the double breakpoint, a total of four contact springs 11 are used. The middle part of the moving contact 9 can also be divided into two pieces, and the contact spring 11 is placed between the two pieces, thereby eliminating the two contact springs 11 for symmetrical balance. However, this is also based on the same inventive concept and is an equivalent replacement solution.

[0029] The following describes the normal operation of this molded case circuit breaker: When a short-circuit current appears in the circuit, the movable contact 9, driven by electrodynamic repulsion, rotates clockwise from the closed position, rapidly separating from the stationary contact 10. As the movable contact 9 moves, the electrodynamic repulsion gradually decreases. The counterclockwise torque exerted by the synchronizing contact spring 11 on the movable contact 9 decreases, without affecting its rotational speed. This structure ensures continuous rotation of the movable contact 9.

[0030] In order to prevent installation errors during production, the rotating shaft 8 is also designed to prevent mistakes, that is, a small cylindrical protrusion 81 is provided on the outer side of the wheel surface of the rotating shaft 8.

[0031] The multi-spacing disconnect structure of this embodiment is used in a dual-break molded case circuit breaker. The two static contacts 10 are symmetrical relative to the movable contact axis 12. The movable contact 9 has two symmetrical distal ends. The spring structure formed by the first contact spring axis 17, the second contact spring axis 18, and the contact spring 11 therebetween is also provided in two sets at the distal ends of the movable contact 9. However, this structure is not limited to use in dual-break molded case circuit breakers; it can also be used in single-break molded case circuit breakers by removing one static contact 10 and one distal end of the movable contact 9.

[0032] In order to balance the two breakpoints in the double-breakpoint molded case circuit breaker and improve the product's breaking performance and electrical life, the moving contact shaft hole of the moving contact 9 adopts a waist-shaped hole, which can realize automatic adjustment of both ends of the moving contact 9.

[0033] In order to reduce the contact resistance between the moving and static contacts, block-shaped silver dots 19 are welded between the contact surfaces of the two groups of moving contacts 9 and the static contacts 10.

[0034] In order to ensure the arc striking effect, the distal end of the moving contact 9 further extends an arc striking angle 91 outward from the opposite arm of the static contact 10 , and the outer edge of the arc striking angle 91 coincides with the motion trajectory of the distal end of the moving contact 9 .

[0035] Based on the same inventive concept, the present application also discloses an embodiment of a circuit breaker, which is a double-breakpoint molded case circuit breaker, comprising two parallel mechanism side plates 21 and a body 22 assembled together, wherein the two mechanism side plates 21 are mounted and fixed on the upper outer side of the body 22, and the circuit breaker further comprises an electromagnetic tripping structure, an arc extinguishing chamber structure and the aforementioned multi-opening-distance breaking structure and a lever 28, a handle 27, a tripping buckle 6, a lower connecting rod 7, an outer connecting rod 20, and a connecting plate 29. The arc extinguishing chamber structure and the multi-opening-distance breaking structure are mainly arranged inside the body 22, and only part of the static contact 9 of the multi-opening-distance breaking structure is outside the body 22. In this embodiment, the static contact 9 is hook-shaped, and the hook handle extends out of the body 22. A through hole is also provided on the connecting beam 82 of the rotating shaft 8. The tripping buckle 6 is plate-shaped and is rotatably mounted on the mechanism side plate 21 through the tripping buckle shaft 26. The handle 2 7 is fixedly mounted on top of a lever 28, which is rotatably mounted on the mechanism side plate 21 via a lever shaft. In this embodiment, the lever shaft uses a roller 23. The distal end of the trip latch 6 is locked with the electromagnetic trip structure. The middle portion of the trip latch 6 is connected to one end of the lower connecting rod 7 via a connecting plate 29. In this embodiment, since there is only one connecting plate 29 and trip latch 6, and two lower connecting rods 7, an axis between the upper ends of the lower connecting rods 7 is connected to the lower end of the connecting plate 29. The other end of the lower connecting rod 7 is connected to both the through hole of the connecting beam 82 and the distal end of the outer connecting rod 20 via an axis (not shown). The lower connecting rod 7 and the outer connecting rod 20 are both external to the housing 22. The two outer connecting rods 20 are respectively fixed to the lower portions of the two mechanism side plates 21 via outer connecting rod shafts. In this embodiment, the outer connecting rod shafts use rivets 24. When the rotating shaft 8 rotates, the outer connecting rods 20 rotate about the outer connecting rod shafts. The outer connecting rods 20 act as retaining frames, effectively preventing the rotating shaft 8 from rotating eccentrically and unbalanced on both sides.

[0036] In order to ensure that the arc is effectively extinguished under different opening distances, the arc striking angle 91 set for the above-mentioned moving contact 9 is corresponding to the arc striking chamber structure. The arc striking chamber structure is configured to include an arc striking piece 25, a plurality of arc striking grids 30 and an arc striking bracket 31. The plurality of arc striking grids 30 are regularly arranged and installed on the arc striking bracket 31. The end of the arc striking grid 30 corresponding to the repelling position of the moving contact 9 is provided with an arc striking piece 25 parallel to the arc striking grid 30. The end of the arc striking piece 25 facing the moving contact 9 is provided with an arc striking piece 25. There is a bend toward the arc extinguishing grid 30, and some of the arc extinguishing grids 30 have arc grooves in the direction toward the moving contact 9 to form a space for accommodating the moving contact 9 to move from the closed position to the open position and accommodating the bending of the arc striking piece 25. The surface of the bend toward the moving contact 9 is parallel to the outer edge of the arc striking angle 91. The arc extinguishing bracket 31, the arc extinguishing grid group 30, the arc striking piece 25 and the outer shell 22 together form an arc extinguishing chamber. Since this embodiment has a double breakpoint structure, there are also two arc extinguishing chambers.

[0037] The arc-striking plates 25 of the arc-extinguishing chamber are bent and placed along the periphery of the rotational trajectory of the moving contact 9 to ensure that, when the product is in the normal opening position, the distance between the arc-striking angle 91 of the moving contact 9 and the arc-striking plates 25 of the arc-extinguishing chamber is equal to the distance between the moving contact 9 and the arc-striking plates 25 when the product is in the repelled position. During the re-clamping process, the distance between the moving contact 9 and the arc-striking plates 25 remains unchanged as the moving contact 9 moves from the opening position to the repelled position. By ensuring the proper utilization of the arc-striking plates 30 of the arc-extinguishing chamber in the normal opening position and the repelled position, the arc can be guaranteed to continue burning within the arc-extinguishing chamber.

[0038] The multi-span disconnect mechanism in this application features a unique rotating shaft-moving contact structure. When the rotating shaft 8 is inactive, the moving contact 9 rotates clockwise to its maximum opening position under the influence of electromotive repulsive force, achieving maximum opening distance and thus interrupting the short-circuit current. This repulsive opening distance is greater than the opening / tripping distance of a molded case circuit breaker. From the onset of the short-circuit current to the rotation of the moving contact 9 to the maximum repulsive opening distance, there is no additional mechanical transmission, resulting in a short operating time and a significant improvement in arc extinguishing capability.

[0039] In this embodiment, the lower connecting rod 7 is located between the mechanism side plate 21 and the body 22, and the outer connecting rod 20 is located on the outside of the mechanism side plate 21. The arc-shaped avoidance groove on the side surface of the body 22 and the mechanism side plate 21 along the rotation trajectory of the far-axis end of the outer connecting rod 20 can also be opened into other avoidance shapes to avoid the shaft (not shown) connecting the outer connecting rod 20, the lower connecting rod 7 and the rotating shaft 8.

[0040] The electromagnetic tripping structure can be any suitable structure. The electromagnetic tripping structure in this embodiment includes an armature 1, a traction rod 2, a three-level lock 3, a two-level lock 4, and a first-level lock 5. The first-level lock 5 is installed between the side plates 21 of the mechanism through the first-level lock shaft 16. When the switch is closed, there is a notch in the top of the distal end of the locking trip 6 in the middle part of the first-level lock 5. The second-level lock 4 is also installed between the side plates 21 of the mechanism through the second-level lock shaft 15. A torsion spring is fixed between the second-level lock 4 and the second-level lock shaft 15. The left top of the second-level lock 4 presses against the top of the distal end of the first-level lock 5 to lock. The three-level lock 3 is installed on the base through its own three-level lock shaft 3a. A torsion spring is also fixed between the three-level lock 3 and the three-level lock shaft 3a. The traction rod 2 is also installed on the base through the traction rod shaft 14 The right side of the three-stage lock buckle 3 is interlocked with the left side of the traction rod 2. The left side of the three-stage lock buckle 3 is provided with a protrusion, which can push the distal end of the secondary lock buckle 4 on the left to rotate clockwise when it rotates counterclockwise. The armature 1 is fixed to the armature bracket through the armature shaft 13. The traction rod 2 is provided with an arm to lock the right side distal end of the three-stage lock buckle 3. When tripped, the armature 1 rotates counterclockwise to hit the part of the traction rod 2 below the traction rod shaft 14, and the traction rod 2 rotates clockwise to release the right side distal end of the three-stage lock buckle 3. The three-stage lock buckle 3 rotates counterclockwise to push the lower part of the secondary lock buckle 4 to rotate clockwise, and the secondary lock buckle 4 rotates clockwise to release the top of the distal end of the first-stage lock buckle 5. The first-stage lock buckle 5 rotates clockwise to release the notch at the top of the distal end of the jump buckle 6 in the middle to make it rotate clockwise.

[0041] The short-circuit current simultaneously triggers the electromagnetic trip mechanism. Starting with the short-circuit current, the following components operate in sequence: armature 1 - drawbar 2 - tertiary latch 3 - secondary latch 4 - primary latch 5 - trip latch 6 - lower connecting rod 7 - shaft 8 - moving contact 9. At this point, the moving contact 9 is at its maximum open position. The combined action of the shaft 8 and housing 22 causes it to automatically return to its initial position, the product's tripped position.

[0042] In the description of this application, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting this application. Furthermore, the terms "first," "second," and the like, if used, are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] The above is only a preferred specific implementation method of this solution, but the scope of protection required by this solution is not limited to this. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, can make equivalent replacements or changes based on the technical solution and inventive concept of this application, which should be covered by the scope of protection of this application.

Claims

1. A multi-spacing breaking structure, comprising a moving contact (9) and a stationary contact (10), characterized in that: The invention also includes a rotating shaft (8), a contact spring (11), a moving contact shaft (12), a first contact spring shaft (17), and a second contact spring shaft (18). The rotating shaft (8) and the moving contact (9) are both provided with a moving contact shaft hole at their centers. The moving contact shaft (12) passes through the coaxial rotating shaft (8) and the moving contact (9). When the far-end of the moving contact (9) is closed, it is closed with the static contact (10). The rotating shaft (8) includes parallel and coaxial wheel surfaces. A space for accommodating the moving contact (9) is formed between the wheel surfaces. The moving contact (9) moves between the wheel surfaces. The wheel surface is connected by a connecting beam (82) symmetrical with respect to the contact shaft (12) at the distal end, the first contact spring shaft (17) and the second contact spring shaft (18) are connected between the two wheel surfaces through an axial hole, one end of the contact spring (11) is hung on the first contact spring shaft (17), and the other end is hung on the second contact spring shaft (18), the axial holes of the first contact spring shaft (17) and the second contact spring shaft (18) of the same group are on the upper and lower sides of the same movable contact (9) arm, and the first contact spring shaft (17) is connected through a circular The shaft hole is fixedly connected to the wheel surface, the second contact spring shaft (18) is slidably connected to the wheel surface through the waist-shaped shaft hole, the circular shaft hole and the static contact (10) are on the same side of the same moving contact (9) arm, the waist-shaped shaft hole and the static contact (10) are on the opposite side of the same moving contact (9) arm, and the moving contact (9) arm is provided with a follow-up curve on the edge of one side of the waist-shaped shaft hole. During the rotation of the moving contact (9), the second contact spring shaft (18) and the follow-up curve of the moving contact (9) arm follow and drive the rotating shaft (8) to rotate, and the moving contact (9) rotates. During the process, there are three positions: the repulsive position, the tripping position, and the opening position. The distances between the contact surface of the far-end of the moving contact (9) and the contact surface of the static contact (10) correspond to the aforementioned positions, namely, the repulsive distance (D1), the tripping distance (D2), and the opening distance (D3). The repulsive distance (D1) is greater than the tripping distance (D2). When the rotating shaft (8) has no additional action, the waist-shaped shaft hole on the rotating shaft (8) and the following curve of the moving contact (9) enable the moving contact (9) to reach the disassembly position and maximize the repulsive distance (D1).

2. The multi-spacing disconnect structure according to claim 1, characterized in that: A protrusion (81) is provided on the outer side of the wheel surface of the rotating shaft (8).

3. The multi-spacing disconnect structure according to claim 1, characterized in that: There are two static contacts (10) that are symmetrical relative to the moving contact axis (12), and the moving contact (9) has two symmetrical distal ends.

4. The multi-spacing disconnect structure according to claim 3, characterized in that: The moving contact shaft hole of the moving contact (9) is a waist-shaped hole.

5. The multi-spacing disconnect structure according to claim 1, characterized in that: Silver dots (19) are also installed between the contact surfaces of the moving contact (9) and the static contact (10).

6. The multi-spacing disconnect structure according to claim 1, characterized in that: The distal end of the movable contact (9) further extends an arc striking angle (91) outwardly of the opposite arm of the stationary contact (10), and the outer edge of the arc striking angle (91) coincides with the motion trajectory of the distal end of the movable contact (9).

7. A circuit breaker comprising a mechanism side plate (21) and a body (22) assembled together, wherein the mechanism side plate (21) is mounted and fixed on the upper outer side of the body (22), characterized in that: The invention also includes an electromagnetic tripping structure, an arc extinguishing chamber structure, and a multi-spacing disconnecting structure according to any one of claims 1 to 6, and a lever (28), a handle (27), a tripping buckle (6), a lower connecting rod (7), an outer connecting rod (20), and a connecting plate (29). The arc extinguishing chamber structure and the multi-spacing disconnecting structure are arranged inside the housing (22). A through hole is provided on the connecting beam (82) of the rotating shaft (8). The tripping buckle (6) is rotatably mounted on the mechanism side plate (21) through the tripping buckle shaft (26). The handle (27) is fixedly mounted on the top of the lever (28). The lever (28) ) is rotatably mounted on the mechanism side plate (21) via a lever shaft, the distal end of the trip buckle (6) is locked with the electromagnetic tripping structure, the middle portion of the trip buckle (6) is connected to one end of the lower connecting rod (7) via a connecting plate (29), the other end of the lower connecting rod (7) is simultaneously connected to the through hole of the connecting beam (82) and the distal end of the outer connecting rod (20), the lower connecting rod (7) and the outer connecting rod (20) are both outside the housing (22), the outer connecting rod (20) is fixed to the lower portion of the mechanism side plate (21) via an outer connecting rod shaft, and the outer connecting rod (20) rotates around the outer connecting rod shaft when the rotating shaft (8) rotates.

8. The circuit breaker according to claim 7, wherein: The invention comprises the multi-spacing disconnecting structure as claimed in claim 6, wherein the arc extinguishing chamber structure comprises an arc striking piece (25), a plurality of arc extinguishing grids (30) and an arc extinguishing bracket (31), wherein the plurality of arc extinguishing grids (30) are regularly arranged and mounted on the arc extinguishing bracket (31), and the end of the arc extinguishing grid (30) corresponding to the open position of the moving contact (9) is provided with an arc striking piece (25) parallel to the arc extinguishing grid (30), and the end of the arc striking piece (25) facing the moving contact (9) is provided with a bend toward the arc extinguishing grid (30), and the plurality of arc extinguishing grids (30) are provided with arc grooves in the direction toward the moving contact (9) to form a space for accommodating the moving contact (9) to move from the closing position to the open position and accommodating the bending of the arc striking piece (25), and the surface of the bend facing the moving contact (9) is parallel to the outer edge of the arc striking angle (91).

9. The circuit breaker according to claim 7, wherein: The outer connecting rod (20) is located outside the mechanism side plate (21), and an avoidance groove is formed on the side surface of the housing (22) and the mechanism side plate (21) along the rotation trajectory of the distal end of the outer connecting rod (20).

10. The circuit breaker according to claim 7, wherein: The electromagnetic tripping structure comprises an armature (1), a traction rod (2), a three-stage lock buckle (3), a two-stage lock buckle (4), and a first-stage lock buckle (5); when the switch is closed, the first-stage lock buckle (5) locks the distal end of the trip buckle (6), the two-stage lock buckle (4) locks the distal end of the first-stage lock buckle (5), and the traction rod (2) locks the three-stage lock buckle (3); when tripping, the armature (1) rotates counterclockwise to strike the traction rod (2), the traction rod (2) rotates clockwise to release the three-stage lock buckle (3), the three-stage lock buckle (3) rotates counterclockwise to push the two-stage lock buckle (4) to rotate clockwise, the two-stage lock buckle (4) rotates clockwise to release the first-stage lock buckle (5), and the first-stage lock buckle (5) rotates clockwise to release the trip buckle (6).

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