A movable contact operating mechanism on a circuit breaker

Abstract

The application relates to a movable contact operating mechanism on a circuit breaker, which comprises a lock catch, a movable contact seat and a movable contact, the lock catch and the movable contact are both rotationally arranged on the movable contact seat, linkage is realized between the movable contact and the movable contact seat through a torsion spring, a torsion spring mounting protruding edge is arranged on the side surface of the movable contact or the movable contact seat, the torsion spring is arranged on the torsion spring mounting protruding edge, two torsion arms of the torsion spring respectively abut against the movable contact seat and the movable contact, a lock catch spring for resetting the lock catch is further arranged on the movable contact seat, the lock catch spring is arranged on the same side surface of the movable contact seat together with the lock catch, and two ends of the lock catch spring respectively abut against the movable contact seat and the lock catch. The lock catch spring is arranged on one side of the movable contact seat together with the lock catch, superposition is avoided, and the mechanism volume is reduced.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker technology, and in particular to a moving contact operating mechanism for a circuit breaker. Background Technology

[0002] A circuit breaker is a switching device capable of closing, carrying, and interrupting current under normal circuit conditions and, within a specified time, closing, carrying, and interrupting current under abnormal circuit conditions. It can quickly cut off power to prevent electric shock accidents. The traditional CN108109886A circuit breaker, with its moving contact operating mechanism, has a relatively thick casing due to the combined thickness of the latch, moving contact mounting base, and connecting plate.

[0003] CN112530758A also proposes a thinner circuit breaker, including a housing, handle, latch, trip unit, moving contact seat, and moving contact. A connecting rod is provided between the handle and the moving contact seat, with the first end of the connecting rod connected to the handle and the second end connected to the moving contact seat. Both the latch and the moving contact are mounted on the moving contact seat, and the moving contact and the moving contact seat are linked by a torsion spring. In this embodiment of the invention, a mounting post is integrally provided on the moving contact seat, and both the latch and the moving contact are movably fitted onto the mounting post. By adopting the above solution, the moving contact is directly rotatably mounted on the moving contact seat, thus eliminating the extra thickness occupied by the mounting seat for mounting the moving contact. However, the latch requires the elastic action of the torsion spring to hold the connecting rod in place, and the mechanism cannot effectively avoid the additional installation space occupied by the thickness of the latch torsion spring. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art. This invention provides a moving contact operating mechanism on a circuit breaker, in which the locking spring and the locking buckle are mounted together on one side of the moving contact seat to avoid overlapping, thereby reducing the size of the mechanism.

[0005] The technical solution of the present invention: a moving contact operating mechanism on a circuit breaker, the mechanism including a latch, a moving contact seat and a moving contact, both the latch and the moving contact being rotatably mounted on the moving contact seat, the moving contact and the moving contact seat being linked by a torsion spring, the moving contact or the moving contact seat having a torsion spring mounting protrusion on its side, the torsion spring being mounted on the torsion spring mounting protrusion, and its two torsion arms respectively abutting against the moving contact seat and the moving contact, the moving contact seat also having a latch spring for resetting the latch, the latch spring and the latch being mounted together on the same side of the moving contact seat, and the two ends of the latch spring respectively abutting against the moving contact seat and the latch.

[0006] By adopting the above solution, the locking spring and the locking buckle are mounted together on one side of the moving contact seat, avoiding their overlapping, thereby reducing the size of the mechanism and enabling reliable operation of the mechanism in a smaller space, making full use of the space.

[0007] A further feature of the present invention is that the moving contact seat has a retaining edge on the side where the latch is mounted, and the retaining edge cooperates with the corresponding side wall of the latch to form a mounting groove, in which the latch spring is mounted.

[0008] By adopting the above solution, the mounting groove is directly formed on the other side of the moving contact seat located on the latch, which is simple to form and reasonable in design.

[0009] A further provision of the present invention includes: a mounting shaft passing through the moving contact seat, with both ends of the mounting shaft mounted on the circuit breaker housing; a first positioning hole on the moving contact; a torsion spring mounting protrusion integrally formed on the outer ring of the first positioning hole of the moving contact; a first protrusion integrally provided on one side of the moving contact seat; the first protrusion located between the inner ring of the first positioning hole and the mounting shaft; a first groove formed between the inner ring of the torsion spring mounting protrusion on the moving contact and the mounting shaft; and a first mounting boss on an inner wall of the circuit breaker housing for inserting the first end of the mounting shaft, with the end of the first mounting boss also inserted into the first groove.

[0010] By adopting the above scheme, on the one hand, the moving contact seat can be easily installed on the circuit breaker housing. The above installation method has multiple safety features. The contact area between the first protrusion, the first mounting boss and the mounting shaft is large, making it less prone to breakage. It increases the strength of the housing for positioning the mechanism in a small volume, and effectively positions the moving contact. The mechanism is reasonably installed, enabling reliable operation of the mechanism in a small space. This avoids the product failure caused by the small fit between the shaft and the housing, which leads to changes in the force point of the mechanism during product use. In addition, the installation is also very convenient. On the other hand, the first protrusion separates the moving contact from the metal mounting shaft to prevent conductivity, and the first mounting boss is inserted into the moving contact. Since sparks cannot bend, it can effectively prevent sparks generated by the torsion spring from turning into the mounting shaft.

[0011] A further feature of the present invention is that the first mounting boss also has a torsion spring abutment, wherein the torsion spring abuts between the moving contact and the torsion spring abutment, and the outer periphery of the torsion spring abutment has a spring ring abutment surface, wherein the abutment surface is a conical surface.

[0012] By adopting the above solution and using a conical abutment surface, there is no need for excessively high fitting precision between it and the torsion spring. This makes it easy to abut torsion springs of different specifications, and it has strong versatility. It can also prevent the torsion spring from shaking or detaching from the mounting protrusion during use.

[0013] A further feature of the present invention is that the circuit breaker housing has a plurality of torsion spring abutments on the inner wall having the first mounting boss, which can abut against the side of the torsion spring coil.

[0014] By adopting the above solution, it is easier to resist the torsion spring and prevent it from shaking or detaching from the mounting protrusion during use.

[0015] A further embodiment of the present invention: the circuit breaker housing has a base and a cover, a first mounting boss is located on the inner wall of the base, a second protrusion is integrally provided on the other side of the moving contact seat, a second positioning hole is provided on the latch, the latch is sleeved on the second protrusion, a second groove is formed between the inner ring of the second positioning hole on the latch and the mounting shaft, a second mounting boss is provided on the inner side wall of the cover, the second mounting boss is for the second end of the mounting shaft to be inserted, and the end of the second mounting boss is also inserted into the second groove.

[0016] By adopting the above scheme, the moving contact seat can be easily installed on the circuit breaker housing. The above installation method has multiple safety features. The second mounting boss is inserted into the second slot, and the contact area between the second protrusion, the second mounting boss and the mounting shaft is large, making it less prone to breakage. It increases the strength of the housing for positioning the mechanism in a small volume, and also effectively positions the latch. The mechanism is installed reasonably, enabling the mechanism to operate reliably in a small space. This avoids the problem of some products on the market failing due to the small fit between the shaft and the housing, which can cause changes in the force point of the product mechanism and lead to product failure during use. In addition, the installation is also very convenient.

[0017] A further feature of the present invention is that the moving contact seat has a limiting groove on one side corresponding to the moving contact, the limiting groove having a first limiting surface and a second limiting surface, and the moving contact having a positioning piece extending into the limiting groove, the positioning piece abutting against the first limiting surface or the second limiting surface to limit the rotation angle of the moving contact.

[0018] By adopting the above scheme, during use, the rotation angle of the moving contact can be limited by the positioning plate cooperating with the first or second limiting surface, thus avoiding excessive displacement.

[0019] A further provision of the present invention includes a handle and a trip unit. A locking rod is provided between the handle and the moving contact seat. A sliding groove is provided on the moving contact seat, and the sliding groove includes a curved part and a straight part. The first end of the locking rod is connected to the handle, and the second end is placed in the sliding groove. A pressing arm is provided on the locking buckle. After the circuit breaker is disconnected, the pressing arm cooperates with the curved part of the sliding groove to lock the second end of the locking rod. At this time, the handle can be pushed to close the circuit breaker. After the circuit breaker is closed, the trip unit of the circuit breaker actuates the locking buckle, causing the locking buckle to rotate. The pressing arm loses its locking of the second end of the locking rod. At this time, the second end of the locking rod slides into the straight part of the sliding groove, and the moving contact seat rotates to realize the circuit breaker disconnection.

[0020] By adopting the above scheme, the stability of the circuit breaker operation can be well guaranteed. The setting of the curved part and the straight part of the slide groove ensures that the locking rod can be controlled when the handle is operated. This ensures that the circuit breaker can be closed normally and that the latch can be quickly released after closing.

[0021] A further feature of the present invention is that the outer side of the locking rod engagement surface on the pressure arm is provided with an inclined guide surface for the second end of the locking rod to slide into the curved part of the slide groove. A lever arm is provided on the latch below the pressure arm. The pressure arm and the lever arm are forked to form a fork. The width of the fork is greater than the diameter of the second end of the locking rod. When the circuit breaker is tripped, the locking rod actuating surface on the lever arm can actuate the second end of the locking rod to make the second end of the locking rod slide into the straight part of the slide groove.

[0022] By adopting the above scheme, the inclined guide surface ensures that the second end of the locking rod can smoothly return to the curved part after tripping for subsequent operations. In fact, the inclined guide surface can be omitted, and only an arc-shaped transition surface can be set at the end, as long as the second end of the locking rod can enter the curved part. The width of the fork ensures smooth opening. The function of the lever arm is to move the second end of the locking rod in case the locking rod gets stuck during opening, ensuring smooth opening and preventing dangerous incidents.

[0023] A further feature of the present invention is that the circuit breaker is a multi-stage circuit breaker, and the latches of two adjacent moving contact operating mechanisms are linked together by a linkage shaft to achieve multi-stage linkage. The latches are respectively provided with a linkage shaft movable slot and a linkage shaft placement hole on both sides for the linkage shaft to be inserted.

[0024] By adopting the above scheme, the linkage shaft is inserted into the linkage shaft placement hole and the other end of the linkage shaft is inserted into the linkage shaft movable slot to achieve multi-stage linkage. The setting of the hole and slot helps to increase the creepage distance between the linkage shaft and other live parts and reduce the risk of voltage breakdown. Attached Figure Description

[0025] Figure 1 This is a structural diagram of a circuit breaker according to a specific embodiment of the present invention;

[0026] Figure 2 This is a circuit breaker closed state diagram according to a specific embodiment of the present invention;

[0027] Figure 3 This is a circuit breaker disconnection state diagram according to a specific embodiment of the present invention;

[0028] Figure 4 This is a diagram showing the circuit breaker in a state of about to trip, according to a specific embodiment of the present invention.

[0029] Figure 5 This is a structural diagram of one side of the moving contact of the moving contact operating mechanism according to a specific embodiment of the present invention;

[0030] Figure 6 This is a structural diagram of the locking side of the moving contact operating mechanism according to a specific embodiment of the present invention;

[0031] Figure 7 This is a structural diagram of the side of the moving contact seat where the moving contact piece is installed, according to a specific embodiment of the present invention;

[0032] Figure 8 This is a structural diagram of the side of the moving contact seat equipped with the locking buckle according to a specific embodiment of the present invention;

[0033] Figure 9 This is a structural diagram of the moving contact in a specific embodiment of the present invention;

[0034] Figure 10 This is a structural diagram of the latch in a specific embodiment of the present invention;

[0035] Figure 11 This is a structural diagram of the latch in a specific embodiment of the present invention;

[0036] Figure 12 This is a structural diagram of the base according to a specific embodiment of the present invention;

[0037] Figure 13 This is a structural diagram of the shell cover according to a specific embodiment of the present invention;

[0038] Figure 14 This is an internal installation structure diagram of a specific embodiment of the present invention.

[0039] In the diagram: 1. Locking latch; 2. Moving contact seat; 3. Moving contact; 4. Torsion spring; 5. Torsion spring mounting protrusion; 6. Locking spring; 7. Stop edge; 8. Mounting groove; 9. Mounting shaft; 10. Circuit breaker housing; 11. First positioning hole; 22. First protrusion; 23. First slot; 4. First mounting boss; 5. Torsion spring abutment; 6. Torsion spring stop part; 7. Spring ring abutment surface; 8. Torsion spring abutment block; 9. Base; 10. Housing cover; 11. Second protrusion; 22. Second positioning hole; 23. Second slot; 24. Second mounting protrusion; 25. Second mounting boss; 26. Second mounting boss; 27. First mounting protrusion; 28. Second mounting boss; 29. ​​Second mounting boss; 20. Second mounting boss; 20. Second mounting boss; 21. First positioning hole; 22. Second mounting protrusion; 23. Second positioning hole; 24. Second mounting boss; 25. Second mounting boss; 26. Second mounting boss; 27. Second mounting boss; 28. Second mounting boss; 29. ​​Second mounting boss; 20. Second mounting boss; 21. First positioning hole; 22. Second mounting boss ... mounting protrusion; 22. Second mounting Mounting boss A21, limiting groove 24, first limiting surface 241, second limiting surface 242, positioning piece 32, handle 11, release device 12, locking rod 13, sliding groove 25, curved part 251, straight part 252, pressing arm 1a, locking rod engagement surface 1a1, guide surface 1a11, lever arm 1b, locking rod actuating surface 1b1, fork 1c, linkage shaft movable groove 18, linkage shaft placement hole 19, linkage shaft 20, spring positioning block 28, spring insert block 16. Detailed Implementation

[0040] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] like Figure 1-14 As shown, the present invention discloses a moving contact operating mechanism on a circuit breaker. The mechanism includes a latch 1, a moving contact seat 2, and a moving contact 3. Both the latch 1 and the moving contact 3 are rotatably mounted on the moving contact seat 2. The moving contact 3 and the moving contact seat 2 are linked together by a torsion spring 4. The moving contact 3 or the moving contact seat 2 has a torsion spring mounting protrusion 5 on its side. The torsion spring 4 is mounted on the torsion spring mounting protrusion 5, and its two torsion arms respectively abut against the moving contact seat 2 and the moving contact 3. The moving contact seat 2 is also provided with a latch spring 6 for resetting the latch 1. The latch spring 6 and the latch 1 are mounted together on the same side of the moving contact seat 2, and the latch... The two ends of the spring 6 abut against the moving contact seat 2 and the latch 1, respectively. The moving contact seat 2 also has a retaining edge 21 on the side where the latch 1 is installed. The retaining edge 21 cooperates with the corresponding side wall of the latch 1 to form a mounting groove 7. The latch spring 6 is installed in the mounting groove 7. The moving contact seat 2 has a spring positioning block 28 on one end of the mounting groove 7, and the latch 1 has a spring insert block 16 on the other end of the mounting groove 7. The spring positioning block 2 positions the latch spring, and the spring positioning block 28 limits the latch spring 6 to prevent the spring 6 from rubbing against other parts. The other end of the latch spring 6 is engaged with the spring insert block 16 and abuts against the latch contact edge. By adopting the above scheme, by installing the latch spring 6 and the latch 1 together on one side of the moving contact seat 2, the overlapping is avoided, thereby reducing the size of the mechanism. The mechanism can operate reliably in a small space, making full use of space. Furthermore, the mounting groove 7 is directly formed on the other side of the moving contact seat 2 where the latch 1 is located, which is simple to form and reasonable in design.

[0042] In this embodiment of the invention, a mounting shaft 8 is provided in the moving contact seat 2, and both ends of the mounting shaft 8 are mounted on the circuit breaker housing A. The moving contact 3 has a first positioning hole 31. The torsion spring mounting protrusion 5 is integrally formed on the outer ring of the first positioning hole 31 of the moving contact 3. A first protrusion 22 is integrally provided on one side of the moving contact seat 2. The first protrusion 22 is located between the inner ring of the first positioning hole 31 and the mounting shaft 8. A first groove 91 is formed between the inner ring of the torsion spring mounting protrusion 5 on the moving contact 3 and the mounting shaft 8. A first mounting boss A11 is provided on an inner wall of the circuit breaker housing A for the first end of the mounting shaft 8 to be inserted. The end of the first mounting boss A11 is also inserted into the first groove 91. By adopting the above scheme, on the one hand, the moving contact seat 2 can be easily installed on the circuit breaker housing A. The above installation method has multiple safety features. The contact area between the first protrusion 22, the first mounting boss A11 and the mounting shaft 8 is large, making it less prone to breakage. It increases the strength of the mechanism positioning on the housing A in a small volume, and effectively positions the moving contact 3. The mechanism installation is reasonable, and the mechanism can operate reliably in a small space. It can avoid the product failure caused by the small fit between the shaft and the housing, which leads to changes in the force point of the product mechanism during use due to the unstable positioning of the product mechanism. In addition, the installation is also very convenient. On the other hand, the first protrusion 22 separates the moving contact 3 from the metal mounting shaft 8 to prevent conductivity. The first mounting boss A11 is inserted into the moving contact 3. Since the spark cannot bend, it can effectively prevent the spark generated by the torsion spring 4 from turning into the mounting shaft 8.

[0043] In this embodiment of the invention, the first mounting boss A11 also has a torsion spring abutment A12. The torsion spring 4 abuts against the moving contact 3 and the torsion spring abutment A12. The outer periphery of the torsion spring abutment A12 has a spring coil abutment surface A121, which is a conical surface. By adopting the above solution and using the conical abutment surface A121, there is no need for excessively high fitting precision between it and the torsion spring 4, which facilitates its abutment against torsion springs 4 of different specifications. It has strong versatility and can prevent the torsion spring 4 from shaking or detaching from the mounting boss 5 during use.

[0044] In this embodiment of the invention, the circuit breaker housing A also has a plurality of torsion spring abutments A13 on its inner wall having a first mounting boss A11, which can abut against the side of the torsion spring 4 coil. By adopting the above solution, it is convenient to abut the torsion spring 4, preventing it from shaking or detaching from the mounting boss 5 during use.

[0045] In this embodiment of the invention, the circuit breaker housing A has a base A1 and a cover A2. A first mounting boss A11 is located on the inner wall of the base A1. A second protrusion 23 is integrally provided on the other side of the moving contact seat 2. The latch 1 has a second positioning hole 10. The latch 1 is sleeved on the second protrusion 23. A second groove 92 is formed between the inner ring of the second positioning hole 10 on the latch 1 and the mounting shaft 8. A second mounting boss A21 is provided on the inner side wall of the cover A2. The second mounting boss A21 is used for the second end of the mounting shaft 8 to be inserted. The end of the second mounting boss A21 is also inserted into the second groove 92. The inner wall of the base A1 also has a contact abutment that abuts against one side of the moving contact 3. By adopting the above scheme, the moving contact seat 2 can be easily installed on the circuit breaker housing A. The above installation method has multiple safety features. The second mounting boss 23 is inserted into the second slot 92. The contact area between the second protrusion 23, the second mounting boss A21 and the mounting shaft 8 is large, making it less prone to breakage. In a small volume, it increases the strength of the housing for positioning the mechanism and effectively positions the latch 1. The mechanism is installed reasonably, enabling reliable operation of the mechanism in a small space. This avoids the problem of some products on the market failing due to the small fit between the shaft and the housing, which causes changes in the force point of the product mechanism during use. In addition, the installation is also very convenient.

[0046] In this embodiment of the invention, the moving contact seat 2 has a limiting groove 24 on one side corresponding to the moving contact. The limiting groove 24 has a first limiting surface 241 and a second limiting surface 242. The moving contact 3 has a positioning piece 32 extending into the limiting groove 24. The positioning piece 32 abuts against the first limiting surface 241 or the second limiting surface 242 to limit the rotation angle of the moving contact 3. It also includes a handle 11 and a trip unit 12. The trip unit 12 is a conventional technical means. A locking rod 13 is provided between the handle 11 and the moving contact seat 2. The moving contact seat 2 is provided with a sliding groove 25. The sliding groove 25 includes a curved part 251 and a straight part 252. The first end of the locking rod 13 is connected to the handle 11, and the second end is placed in the sliding groove 25. The latch 1 is provided with a pressing arm 1a. After the circuit breaker is disconnected, the pressing arm 1a cooperates with the curved part 251 of the sliding groove 25 to lock the second end of the locking rod 13. The circuit breaker is locked at the end, and the handle can be pushed to close the circuit breaker. After the circuit breaker is closed, the trip unit 12 of the circuit breaker actuates the latch 1, causing the latch 1 to rotate. The pressure arm 1a loses its lock on the second end of the locking rod 13. At this time, the second end of the locking rod 13 slides into the straight part 252 of the slide groove 25, and the moving contact seat 2 rotates to open the circuit breaker. The locking rod engagement surface 1a1 on the pressure arm 1a has an inclined guide surface 1a11 on the outside of which the second end of the locking rod 13 can slide into the curved part 251 of the slide groove. The latch 1 is provided with a lever arm 1b below the pressure arm 1a. The pressure arm 1a and the lever arm 1b are forked to form a fork 1c. The width of the fork 1c is greater than the diameter of the second end of the locking rod 13. When the circuit breaker is opened, the locking rod lever actuating surface 1b1 on the lever arm 1b can actuate the second end of the locking rod 13 to make the second end of the locking rod 13 slide into the straight part 252 of the slide groove.By adopting the above scheme, the stability of the circuit breaker operation can be well guaranteed. The curved portion 251 and the straight portion 252 of the slide groove ensure that the handle 11 can control the locking rod 13 during operation. This guarantees normal circuit breaker closing and rapid disengagement of the latch 1 after closing. In use, pushing the handle 11 causes the locking rod 13 to engage with the locking rod 13 under the action of the latch 1. With the push of the handle 11, the mechanism rotates clockwise until it reaches the closed position. In case of overload, short circuit, or leakage, the latch 1 rotates counterclockwise under the action of the double-metal pull rod core, separating the locking rod 13 from the locking rod engagement surface 1a1 of the latch 1, and the locking rod 13 moves outward from the slide groove 25. If the product ages and fails at this time, the locking lever actuating surface 1b1 will pull the locking lever 13, thereby unlocking the mechanism and returning it to its original position. The handle 11 and the latch 1 will return to their original positions under the action of the handle spring and the latch spring 6, respectively. The inclined guide surface 1a11 ensures that the second end of the locking lever 13 can smoothly return to the bent part 251 after the latch is released for subsequent operations. In fact, the inclined guide surface 1a11 can be omitted, and only an arc-shaped transition surface can be provided at the end, as long as the second end of the locking lever 13 can enter the bent part 251. The width of the fork 1c ensures smooth opening. The function of the lever arm 1b is to actuate the second end of the locking lever 13 if it gets stuck during opening, ensuring smooth opening and preventing dangerous situations. The structure and principle of the handle-driven contact operating mechanism are consistent with the driving structure in the applicant's previously submitted patents CN112530757A and CN112530752A, so they will not be described in detail.

[0047] In this embodiment of the invention, the circuit breaker is a multi-stage circuit breaker. The latches 1 of two adjacent moving contact operating mechanisms achieve multi-stage linkage through the linkage shaft 20. The latches 1 have linkage shaft slots 18 and linkage shaft placement holes 19 on both sides for the linkage shaft 20 to be inserted. By adopting the above scheme, multi-stage linkage is achieved by inserting the linkage shaft 20 into the linkage shaft placement hole 19 and the other end of the linkage shaft 20 into the linkage shaft slot 18. The holes and slots help increase the creepage distance between the linkage shaft 20 and other live parts and reduce the risk of voltage breakdown.

[0048] It should be noted that in the description of this invention, all directional indications (such as up, down, forward, backward, etc.) are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0049] Furthermore, in this invention, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, "a number" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

Claims

1. A moving contact operating mechanism on a circuit breaker, the mechanism comprising a latch (1), a moving contact seat (2), and a moving contact (3), wherein the latch (1) and the moving contact (3) are rotatably mounted on the moving contact seat (2), and the moving contact (3) and the moving contact seat (2) are linked together by a torsion spring (4), wherein the moving contact (3) or the moving contact seat (2) has a torsion spring mounting protrusion (5) on its side, and the torsion spring (4) is mounted on the torsion spring mounting protrusion (5), and its two torsion arms respectively abut against the moving contact seat (2) and the moving contact (3), characterized in that: The moving contact seat (2) is also provided with a locking spring (6) for resetting the latch (1). The locking spring (6) and the latch (1) are installed together on the same side of the moving contact seat (2), and the two ends of the locking spring (6) abut against the moving contact seat (2) and the latch (1) respectively. An installation shaft (8) is inserted in the moving contact seat (2). Both ends of the installation shaft (8) are mounted on the circuit breaker housing (A). The moving contact (3) has a first positioning hole (31). The torsion spring mounting protrusion (5) is integrally formed on the outer ring of the first positioning hole (31) of the moving contact (3). A first protrusion (22) is integrally provided on one side of the moving contact seat (2). The first protrusion (22) is located between the inner ring of the first positioning hole (31) and the installation shaft (8). A first groove (91) is formed between the inner ring of the torsion spring mounting protrusion (5) on the moving contact (3) and the installation shaft (8). A first mounting boss (A11) is provided on an inner wall of the circuit breaker housing (A) for the first end of the installation shaft (8) to be inserted. The end of the first mounting boss (A11) is also inserted into the first groove (91). The first mounting boss (A11) also has a torsion spring abutment (A12), the torsion spring (4) abuts between the moving contact (3) and the torsion spring abutment (A12), and the outer periphery of the torsion spring abutment (A12) has a spring ring abutment surface (A121), the abutment surface (A121) is a conical surface.

2. The moving contact operating mechanism on the circuit breaker according to claim 1, characterized in that: The moving contact seat (2) also has a retaining edge (21) on the side where the latch (1) is installed. The retaining edge (21) and the corresponding side wall of the latch (1) cooperate to form a mounting groove (7), and the latch spring (6) is installed in the mounting groove (7).

3. The moving contact operating mechanism on the circuit breaker according to claim 1 or 2, characterized in that: The circuit breaker housing (A) also has a plurality of torsion spring blocks (A13) on its inner wall having a first mounting boss (A11) that can abut against the side of the torsion spring (4) coil.

4. The moving contact operating mechanism on the circuit breaker according to claim 1 or 2, characterized in that: The circuit breaker housing (A) has a base (A1) and a cover (A2). A first mounting boss (A11) is located on the inner wall of the base (A1). A second protrusion (23) is integrally provided on the other side of the moving contact seat (2). A second positioning hole (10) is provided on the latch (1). The latch (1) is sleeved on the second protrusion (23). A second groove (92) is formed between the inner ring of the second positioning hole (10) on the latch (1) and the mounting shaft (8). A second mounting boss (A21) is provided on the inner side wall of the cover (A2). The second mounting boss (A21) is used for the second end of the mounting shaft (8) to be inserted. The end of the second mounting boss (A21) is also inserted into the second groove (92).

5. The moving contact operating mechanism on the circuit breaker according to claim 1 or 2, characterized in that: The moving contact seat (2) has a limiting groove (24) on one side of the corresponding moving contact. The limiting groove (24) has a first limiting surface (241) and a second limiting surface (242). The moving contact (3) has a positioning piece (32) that extends into the limiting groove (24). The positioning piece (32) abuts against the first limiting surface (241) or the second limiting surface (242) to limit the rotation angle of the moving contact (3).

6. The moving contact operating mechanism on the circuit breaker according to claim 1 or 2, characterized in that: It also includes a handle (11) and a trip unit (12). A locking rod (13) is provided between the handle (11) and the moving contact seat (2). A sliding groove (25) is provided on the moving contact seat (2). The sliding groove (25) includes a curved part (251) and a straight part (252). The first end of the locking rod (13) is connected to the handle (11), and the second end is placed in the sliding groove (25). A pressing arm (1a) is provided on the latch (1). After the circuit breaker is disconnected, the pressing arm (1a) is activated. a) The second end of the locking rod (13) can be locked by cooperating with the curved part (251) of the slide groove (25). At this time, the handle can be pushed to close the circuit breaker. After the circuit breaker is closed, the trip unit (12) of the circuit breaker operates on the latch (1) to make the latch (1) rotate. Then the pressure arm (1a) loses its lock on the second end of the locking rod (13). At this time, the second end of the locking rod (13) slides into the straight part (252) of the slide groove (25) and the moving contact seat (2) rotates to realize the circuit breaker disconnection.

7. The moving contact operating mechanism on a circuit breaker according to claim 6, characterized in that: An inclined guide surface (1a11) is provided on the outer side of the locking rod engagement surface (1a1) on the pressure arm (1a) so that the second end of the locking rod (13) can slide into the curved part (251) of the slide groove. A lever arm (1b) is provided on the latch (1) below the pressure arm (1a). The pressure arm (1a) and the lever arm (1b) are forked to form a fork (1c). The width of the fork (1c) is greater than the diameter of the second end of the locking rod (13). The locking rod actuating surface (1b1) on the lever arm (1b) can actuate the second end of the locking rod (13) when the circuit breaker is tripped, so that the second end of the locking rod (13) slides into the straight part (252) of the slide groove.

8. The moving contact operating mechanism on the circuit breaker according to claim 1 or 2, characterized in that: The circuit breaker is a multi-stage circuit breaker. The latches (1) of two adjacent moving contact operating mechanisms achieve multi-stage linkage through the linkage shaft (20). The latches (1) are respectively provided with linkage shaft movable slots (18) and linkage shaft placement holes (19) on both sides for the linkage shaft (20) to be inserted.

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