阅读说明：本技术 一种内置超程弹簧一体化永磁机构 (Integrated permanent magnet mechanism with built-in overtravel spring ) 是由 朱苛娄 郭忠贺 邹高鹏 王斐 关红伟 张二勇 郭佩淇 鲁世浩 韩亮 张文 于 2021-04-20 设计创作，主要内容包括：本发明提供了一种内置超程弹簧一体化永磁机构,包括：外壳；线圈；永磁体；静铁芯,固定在外壳的一端；动铁芯；传动杆,外周面上设有环形凸台；永磁机构还包括：分闸弹簧,设在静铁芯和环形凸台之间,分闸弹簧端部顶压在环形凸台一端端面上；超程弹簧,设在动铁芯的内腔中,超程弹簧端部顶压在环形凸台另一端端面上；限位组件,设在动铁芯的远离静铁芯的一侧,限位组件、动铁芯、超程弹簧及传动杆组成一个运动单元。本发明通过环形凸台将分闸弹簧和超程弹簧隔开,避免它们在变形过程中相互影响,避免出现磨损。本发明实现超程弹簧内置,简化了断路器传动系统结构,可提高断路器操作的可靠性和稳定性,降低制造成本和产品调试难度,降低劳动强度。(The invention provides an integrated permanent magnet mechanism with a built-in overtravel spring, which comprises: a housing; a coil; a permanent magnet; the static iron core is fixed at one end of the shell; a movable iron core; the outer peripheral surface of the transmission rod is provided with an annular boss; the permanent magnet mechanism further comprises: the opening spring is arranged between the static iron core and the annular boss, and the end part of the opening spring is pressed on the end face of one end of the annular boss; the overtravel spring is arranged in the inner cavity of the movable iron core, and the end part of the overtravel spring is pressed on the end surface of the other end of the annular boss; the limiting assembly is arranged on one side, away from the static iron core, of the movable iron core, and the limiting assembly, the movable iron core, the over travel spring and the transmission rod form a moving unit. The invention separates the opening spring and the overtravel spring by the annular boss, thereby avoiding the mutual influence of the opening spring and the overtravel spring in the deformation process and avoiding the abrasion. The invention realizes the built-in of the over travel spring, simplifies the structure of the transmission system of the circuit breaker, can improve the reliability and stability of the operation of the circuit breaker, reduces the manufacturing cost and the debugging difficulty of products, and reduces the labor intensity.)

1. An integrated permanent magnet mechanism with a built-in overtravel spring, comprising:

a housing;

the coil is fixedly arranged in the shell through the coil framework;

the permanent magnet is fixedly arranged in the shell;

the static iron core is fixedly arranged at one end of the shell;

the movable iron core is cylindrical and is provided with an inner cavity;

the transmission rod penetrates through the static iron core and the movable iron core and is used for driving a movable contact of the circuit breaker to act so as to realize opening and closing with the static contact;

the method is characterized in that: the peripheral face of transfer line is provided with annular boss, and built-in overtravel spring integration permanent magnetism mechanism still includes:

the opening spring is arranged between the static iron core and the annular boss and sleeved outside the transmission rod, and the end part of the opening spring is pressed on the end face of one end of the annular boss;

the overtravel spring is arranged in the inner cavity of the movable iron core and sleeved outside the transmission rod, and the end part of the overtravel spring is pressed on the end surface of the other end of the annular boss;

the limiting assembly is arranged on one side, away from the static iron core, of the movable iron core, the limiting assembly is matched with the transmission rod and the movable iron core, the limiting assembly, the movable iron core, the over travel spring and the transmission rod form a moving unit, the moving unit is used for moving towards the static iron core and compressing the separating brake spring integrally in the switching-on process, after the moving contact and the static contact of the breaker are contacted, the transmission rod stops moving, the movable iron core continues to move towards the static iron core and compress the over travel spring relative to the transmission rod until the movable iron core is contacted with the static iron core, and the switching-on process is finished.

2. The integrated permanent magnet mechanism with built-in overtravel spring as claimed in claim 1, wherein: the annular boss is movably matched with the inner wall of the movable iron core in a guiding way.

3. The integrated permanent magnet mechanism with built-in overtravel spring as claimed in claim 2, wherein: and a guide ring is fixedly arranged in the shell and is matched with the outer wall of the movable iron core in a guiding and moving way.

4. The integrated permanent magnet mechanism with built-in overtravel spring as claimed in claim 3, wherein: a first retaining shoulder is convexly arranged on the inner wall of the shell, and one end of the permanent magnet is pressed against the first retaining shoulder; the integrated permanent magnet mechanism with the built-in overtravel spring also comprises a support ring, the support ring is arranged on the inner side of the permanent magnet, a second retaining shoulder is arranged at the end part of the support ring, and the other end of the permanent magnet is pressed against the second retaining shoulder; the support ring is also provided with an installation step for installing the guide ring.

5. The integrated permanent magnet mechanism with built-in overtravel spring as claimed in claim 4, wherein: one end of the coil framework is pressed against the support ring and the guide ring, and the other end of the coil framework is pressed against the static iron core.

6. The integrated permanent magnet mechanism with the built-in overtravel spring as claimed in any one of claims 1 to 5, wherein: an end plate is integrally arranged at one end of the movable iron core, which is far away from the static iron core, and the end part of the over travel spring is pressed on the end plate; the integrated permanent magnet mechanism with the built-in overtravel spring also comprises an end cover fixed at the other end of the shell, a transmission rod penetrates through the end plate and the end cover, and the end plate is attached to the end cover in a brake-off state; the limiting assembly comprises a compression spring and a blocking piece, the blocking piece is fixed on the transmission rod, the compression spring penetrates through the end cover and is sleeved outside the transmission rod, and two ends of the compression spring are respectively pressed on the end plate and the blocking piece.

7. The integrated permanent magnet mechanism with built-in overtravel spring as claimed in claim 6, wherein: the stopping piece comprises a stopping sleeve and a nut, the stopping sleeve is sleeved outside the transmission rod and located between the nut and the compression spring, and the nut is in threaded connection with the transmission rod and used for tightly extruding the stopping sleeve.

8. The integrated permanent magnet mechanism with built-in overtravel spring as claimed in claim 7, wherein: the stopping sleeve is provided with stopping steps, and the transmission rod is provided with limiting steps matched with the stopping steps in a stopping manner so as to limit the stopping sleeve on the transmission rod.

9. The integrated permanent magnet mechanism with built-in overtravel spring as claimed in claim 7, wherein: the end cover is fixed with a first guide sleeve used for guiding the stopping sleeve.

10. The integrated permanent magnet mechanism with the built-in overtravel spring as claimed in any one of claims 1 to 5, wherein: a second guide sleeve for guiding the transmission rod is fixed on the static iron core; and the static iron core is also provided with an extension hole for the end part of the opening spring to extend into.

Technical Field

The invention relates to the technical field of permanent magnet mechanisms, in particular to an integrated permanent magnet mechanism with a built-in overtravel spring.

Background

The permanent magnet mechanism is widely applied at present, the permanent magnet mechanism mainly comprises a magnetic yoke, a closing coil, a permanent magnet, a guide and the like, and the structures of different manufacturers are changed, and the principle is the same. At present, the use of permanent magnetic mechanism needs the supporting circuit breaker transmission circuit spring assembly that exceeds journey, when installation spring assembly that exceeds journey, because need adjust the compression of spring that exceeds journey through the helicitic texture, consequently has screw thread regulation, fastening not hard up problem, and production is comparatively complicated. In addition, the structure of the over travel spring assembly is complex, so that the structure of a transmission system of the circuit breaker is complex, the reliability and stability of the operation of the circuit breaker are influenced, and the manufacturing cost and the product debugging difficulty are increased.

In this regard, chinese utility model with publication number CN207966771U discloses a permanent magnet operating mechanism, which is formed by sleeving an opening spring and an overtravel spring on the outer side of an output shaft (i.e. a transmission rod), so as to integrate the permanent magnet operating mechanism and the overtravel spring. During closing, the movable iron core drives the magnetic conduction plate to move synchronously, the magnetic conduction plate compresses the opening spring to realize energy storage, meanwhile, the magnetic conduction plate drives the output shaft to move through the overtravel spring, so that the output shaft drives the moving contact to be contacted with the fixed contact to realize closing, the output shaft stops moving after closing, the movable iron core drives the magnetic conduction plate to continue to move, and the overtravel spring is compressed until the movable iron core is contacted with the fixed iron core. During opening, the elastic force of the opening spring and the over travel spring acts on the magnetic conduction plate simultaneously, and rapid opening is achieved.

The permanent magnet operating mechanism is characterized in that the opening spring and the overtravel spring are sleeved outside the output shaft, the two springs are not synchronously deformed in the opening and closing process, relative motion exists between the two springs, the inner and outer nested mode can not only influence the deformation of each other, but also cause serious abrasion after long-term use, and further influence the service performance of the permanent magnet mechanism.

Disclosure of Invention

The invention aims to provide an integrated permanent magnet mechanism with a built-in overtravel spring, which aims to solve the problems that a brake separating spring and the overtravel spring of the conventional permanent magnet mechanism are embedded and sleeved outside a transmission rod to cause mutual deformation and influence and abrasion.

In order to realize the purpose, the integrated permanent magnet mechanism with the built-in overtravel spring adopts the following technical scheme:

an integrated permanent magnet mechanism with a built-in overtravel spring, comprising:

a housing;

the coil is fixedly arranged in the shell through the coil framework;

the permanent magnet is fixedly arranged in the shell;

the static iron core is fixedly arranged at one end of the shell;

the movable iron core is cylindrical and is provided with an inner cavity;

the transmission rod penetrates through the static iron core and the movable iron core and is used for driving a movable contact of the circuit breaker to act so as to realize opening and closing with the static contact;

the peripheral face of transfer line is provided with annular boss, and built-in overtravel spring integration permanent magnetism mechanism still includes:

the opening spring is arranged between the static iron core and the annular boss and sleeved outside the transmission rod, and the end part of the opening spring is pressed on the end face of one end of the annular boss;

the overtravel spring is arranged in the inner cavity of the movable iron core and sleeved outside the transmission rod, and the end part of the overtravel spring is pressed on the end surface of the other end of the annular boss;

the limiting assembly is arranged on one side, away from the static iron core, of the movable iron core, the limiting assembly is matched with the transmission rod and the movable iron core, the limiting assembly, the movable iron core, the over travel spring and the transmission rod form a moving unit, the moving unit is used for moving towards the static iron core and compressing the separating brake spring integrally in the switching-on process, after the moving contact and the static contact of the breaker are contacted, the transmission rod stops moving, the movable iron core continues to move towards the static iron core and compress the over travel spring relative to the transmission rod until the movable iron core is contacted with the static iron core, and the switching-on process is finished.

The beneficial effects of the above technical scheme are that: the transmission rod of the permanent magnet mechanism is provided with the annular boss, the opening spring is arranged on one side of the annular boss, the end part of the opening spring is pressed against the end face of one end of the annular boss, the overtravel spring is arranged on the other side of the annular boss, the end part of the overtravel spring is pressed against the end face of the other end of the annular boss, and the opening spring and the overtravel spring are separated by the annular boss, so that the mutual influence of the opening spring and the overtravel spring in the deformation process can be avoided, the abrasion is avoided, and the service performance of the permanent magnet mechanism is ensured.

In addition, the arrangement of the limiting assembly ensures that the limiting assembly and the movable iron core, the overtravel spring and the transmission rod form a moving unit, so that in the switching-on process, the moving unit firstly moves integrally towards the static iron core and compresses the switching-off spring, after a movable contact of the circuit breaker is contacted with a static contact, the transmission rod stops moving, the movable iron core continuously moves towards the static iron core relative to the transmission rod and compresses the overtravel spring until the movable iron core is contacted with the static iron core, the switching-on process is finished, the smooth operation of the whole switching-on process is ensured, the switching-off spring and the overtravel spring are sequentially compressed, and the basic functions of the permanent magnet mechanism and the integration of the permanent magnet mechanism and the overtravel spring are realized.

Furthermore, in order to ensure smooth movement of the movable iron core and reduce abrasion, the annular boss is movably matched with the inner wall of the movable iron core in a guiding manner.

Furthermore, in order to improve the guiding effect of the movable iron core, a guide ring is fixedly arranged in the shell and is movably matched with the outer wall of the movable iron core in a guiding manner.

Furthermore, in order to facilitate the installation of the permanent magnet and the guide ring, a first retaining shoulder is convexly arranged on the inner wall of the shell, and one end of the permanent magnet is pressed against the first retaining shoulder; the integrated permanent magnet mechanism with the built-in overtravel spring also comprises a support ring, the support ring is arranged on the inner side of the permanent magnet, a second retaining shoulder is arranged at the end part of the support ring, and the other end of the permanent magnet is pressed against the second retaining shoulder; the support ring is also provided with an installation step for installing the guide ring.

Furthermore, in order to fix the permanent magnet, the support ring and the guide ring conveniently and to install the coil framework conveniently, one end of the coil framework is pressed against the support ring and the guide ring, and the other end of the coil framework is pressed against the static iron core.

Furthermore, in order to facilitate the arrangement of the over travel spring, conveniently form protection on internal components of the permanent magnetic mechanism, conveniently keep the dynamic balance of the moving unit, provide initial pressure for the over travel spring, and buffer the movable iron core, one end of the movable iron core, which is far away from the static iron core, is integrally provided with an end plate, and the end part of the over travel spring is pressed on the end plate; the integrated permanent magnet mechanism with the built-in overtravel spring also comprises an end cover fixed at the other end of the shell, a transmission rod penetrates through the end plate and the end cover, and the end plate is attached to the end cover in a brake-off state; the limiting assembly comprises a compression spring and a blocking piece, the blocking piece is fixed on the transmission rod, the compression spring penetrates through the end cover and is sleeved outside the transmission rod, and two ends of the compression spring are respectively pressed on the end plate and the blocking piece.

Furthermore, in order to facilitate manufacturing and installation of the blocking member, the blocking member comprises a blocking sleeve and a nut, the blocking sleeve is sleeved outside the transmission rod and is located between the nut and the compression spring, and the nut is in threaded connection with the transmission rod and is used for tightly extruding the blocking sleeve.

Furthermore, in order to conveniently limit the stop sleeve, the stop sleeve is provided with a stop step, and the transmission rod is provided with a limit step matched with the stop of the stop step so as to limit the stop sleeve on the transmission rod.

Furthermore, in order to guide the movement of the stopping sleeve and further indirectly guide the movement of the transmission rod, a first guide sleeve for guiding the stopping sleeve is fixed on the end cover.

Furthermore, in order to guide the movement of the transmission rod conveniently and to facilitate the arrangement and installation of the opening spring, a second guide sleeve for guiding the transmission rod is fixed on the static iron core; and the static iron core is also provided with an extension hole for the end part of the opening spring to extend into.

Drawings

FIG. 1 is an external view of an integrated permanent magnet mechanism with an overtravel spring built in according to the present invention;

FIG. 2 is a sectional view of the integrated permanent magnet mechanism with an over travel spring built therein according to the present invention;

FIG. 3 is a structural diagram of a transmission rod of the integrated permanent magnet mechanism with an overtravel spring built in;

FIG. 4 is a cross-sectional view of the housing of the integrated permanent magnet mechanism with an over travel spring built therein according to the present invention;

FIG. 5 is a sectional view of the movable iron core of the integrated permanent magnet mechanism with an overtravel spring built therein according to the present invention;

fig. 6 is an enlarged view of a portion a in fig. 2.

In the figure: 1. a stationary iron core; 2. a second guide sleeve; 3. a transmission rod; 31. a first polished rod segment; 32. a second polished rod segment; 33. a threaded segment; 34. an annular boss; 35. a limiting step; 4. a brake separating spring; 5. an over travel spring; 6. a guide ring; 7. a permanent magnet; 8. a compression spring; 9. a first guide sleeve; 10. a stopping sleeve; 11. an end cap; 12. a movable iron core; 121. an inner boss; 122. an outer boss; 13. a support ring; 131. a second shoulder; 14. a housing; 141. an annular projection; 142. a first catch shoulder; 15. a coil; 16. coil skeleton, 17, nut.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The features and properties of the present invention are described in further detail below with reference to examples.

An embodiment of an integrated permanent magnet mechanism with an overtravel spring built in (hereinafter referred to as a permanent magnet mechanism) in the invention is shown in fig. 1 and fig. 2, and comprises a shell 14, a coil 15, a permanent magnet 7, a static iron core 1, a movable iron core 12, a transmission rod 3, a separating brake spring 4, an overtravel spring 5 and an end cover 11, wherein the shell 14 is a yoke, the static iron core 1 is fixedly connected to one end of the shell 14, and the end cover 11 is fixedly connected to the other end of the shell 14. The coil 15 is fixedly arranged in the shell 14 through a coil frame 16, and one end of the coil frame 16 is pressed against the static iron core 1.

Referring to fig. 4 and 2, a ring of annular protrusion 141 is protruded from the inner wall of the housing 14, a first stop shoulder 142 is disposed on the annular protrusion 141, and one end of the permanent magnet 7 is pressed against the first stop shoulder 142. The permanent magnet mechanism further comprises a support ring 13, the support ring 13 is arranged on the inner side of the permanent magnet 7, as shown in fig. 6, a second stop shoulder 131 is arranged at the end of the support ring 13, and the other end of the permanent magnet 7 is pressed against the second stop shoulder 131. The permanent magnet mechanism further comprises a guide ring 6 arranged in the shell 14, the guide ring 6 is in guide movable fit with the outer wall of the movable iron core 12, and a mounting step (not marked in the figure) for mounting the guide ring 6 is arranged on the support ring 13. The other end of the coil framework 16 is pressed against the support ring 13 and the guide ring 6, so that the permanent magnet 7, the support ring 13 and the guide ring 6 are fixedly arranged in the shell 14.

Referring to fig. 5 and 2, the movable iron core 12 is cylindrical and has an inner cavity, the transmission rod 3 penetrates through the stationary iron core 1, the movable iron core 12 and the end cover 11, and the transmission rod 3 is used for driving a movable contact of the circuit breaker to move so as to realize opening and closing with the stationary contact. The over travel spring 5 is disposed in the inner cavity of the movable iron core 12 and sleeved outside the transmission rod 3, specifically, as shown in fig. 3, the transmission rod 3 includes a first polished rod section 31, a second polished rod section 32, a threaded section 33, and an annular boss 34 located between the first polished rod section 31 and the second polished rod section 32, the over travel spring 5 is sleeved outside the second polished rod section 32, and one end of the over travel spring 5 is pressed against an end face of one end of the annular boss 34. An end plate (not marked in the figure) is integrally arranged at one end of the movable iron core 12, which is far away from the static iron core 1, the end plate is attached to the end cover 11 in the brake-off state, and the transmission rod 3 penetrates through the end plate, as shown in fig. 5, so that an inner boss 121 and an outer boss 122 are formed at the end part of the movable iron core 12, and the other end of the over travel spring 5 is pressed on the inner boss 121. Meanwhile, the movable iron core 12 is hollowed to form the overtravel spring 5, so that the magnetic flux cross section of the movable iron core 12 is affected, and the structures of the inner boss 121 and the outer boss 122 can just make up for the missing magnetic flux cross section of the movable iron core 12.

Annular boss 34 is located movable iron core 12, and moves the cooperation with the inner wall direction of movable iron core 12, and annular boss 34 and guide ring 6 realize the direction to movable iron core 12 jointly, ensure that it removes smoothly, avoid producing wearing and tearing.

The opening spring 4 is arranged between the static iron core 1 and the annular boss 34 and sleeved outside the transmission rod 3, specifically, the opening spring is sleeved outside the first light rod section 31, one end of the opening spring 4 is pressed on the end face of the other end of the annular boss 34, the other end of the opening spring 4 is pressed on the static iron core 1, as shown in fig. 2, an extending hole for extending the end of the opening spring 4 is formed in the static iron core 1, and the static iron core 1 is further fixed with a second guide sleeve 2 for guiding the first light rod section 31 of the transmission rod.

The permanent magnet mechanism further comprises a limiting component, the limiting component is arranged on one side, far away from the static iron core 1, of the movable iron core 12, the limiting component comprises a compression spring 8 and a blocking piece, the compression spring 8 is a disc spring, the compression spring is sleeved outside the second light bar section 32, and one end of the disc spring is pressed against the inner boss 121 of the movable iron core 12. The stop member is fixed on the transmission rod 3, the compression spring 8 passes through the end cover 11, and the other end of the compression spring is pressed against the stop member.

Specifically, as shown in fig. 2, the stopping member includes a stopping sleeve 10 and a nut 17, the stopping sleeve 10 is sleeved outside the threaded section 33 of the transmission rod and is located between the nut 17 and the pressing spring 8, and the nut 17 is connected to the threaded section 33 of the transmission rod in a threaded manner and is used for tightly squeezing the stopping sleeve 10. In order to facilitate the installation of the stopping sleeve 10 and to control the compression amount of the pressing spring 8, a stopping step (not labeled in the figure) is disposed on the stopping sleeve 10, and a limiting step 35 engaged with the stopping step is disposed on the transmission rod 3 to limit the stopping sleeve 10 on the transmission rod 3.

During assembly, the annular boss 34 extrudes the over travel spring 5, the stop sleeve 10 extrudes the compression spring 8, the over travel spring 5 and the compression spring 8 are both in a pre-compression state, the springs on two sides of the movable iron core 12 form dynamic balance, namely the limiting assembly, the transmission rod 3 and the movable iron core 12 are matched, the limiting assembly, the movable iron core 12, the over travel spring 5 and the transmission rod 3 form a moving unit, the moving unit firstly moves integrally towards the static iron core 1 and compresses the separating brake spring 4 in the closing process, after a moving contact and a static contact of the circuit breaker are contacted, the transmission rod 3 stops moving, the movable iron core 12 continuously moves towards the static iron core 1 relative to the transmission rod 3 and compresses the over travel spring 5 until the movable iron core 12 and the static iron core 1 are contacted, and the closing process is finished.

The compression spring 8 provides initial pressure for the compression of the over travel spring 5, so that the requirement of the pressure of the closing contact is met. After the movable iron core 12 enters the over travel moving stage, because the movable iron core 12 and the transmission rod 3 are relatively moved, the elastic force of the compression spring 8 is released, and the movable iron core 12 is facilitated to move towards the direction of the static iron core 1. And when the brake is switched off, the buffer effect can be formed on the movable iron core 12, and the service life of the movable iron core 12 is prolonged.

In order to guide the movement of the transmission rod 3, a first guide sleeve 9 is fixed to the end cap 11, and the first guide sleeve 9 is used to guide the stopper sleeve 10, thereby indirectly guiding the transmission rod 3.

The working principle of the permanent magnet mechanism is as follows:

when the switch-on is started, the state is as shown in fig. 2, the coil 15 is electrified to generate a magnetic field, the movable iron core 12 starts to move upwards under the action of the magnetic field of the coil, the transmission rod 3 starts to compress the switch-off spring 4, when the movement stroke is the opening distance required by the circuit breaker, the moving contact of the circuit breaker stops moving, the movable iron core 12 does not move to the contact position with the static iron core 1 (the stroke of the permanent magnet mechanism is larger than the opening distance of the circuit breaker), the movable iron core 12 continues to move, the transmission rod 3 stops moving, the overtravel spring 5 starts to be compressed at the moment, the movable iron core 12 contacts the static iron core 1, and the movable iron core 12 is kept by the permanent magnet 7 after the movable iron core 12 contacts the static iron core 1. When the brake is switched off, the coil 15 is electrified reversely, the direction of the magnetic field generated by the coil is opposite to that of the magnetic field of the permanent magnet, the holding force of the movable iron core 12 is weakened, and the movable iron core 12 starts to be switched off under the action of the over-travel spring 5 and the brake-off spring 4.

The transmission rod of the permanent magnet mechanism is provided with the annular boss, the opening spring is arranged on one side of the annular boss, the end part of the opening spring is pressed against the end face of one end of the annular boss, the overtravel spring is arranged on the other side of the annular boss, the end part of the overtravel spring is pressed against the end face of the other end of the annular boss, and the opening spring and the overtravel spring are separated by the annular boss, so that the mutual influence of the opening spring and the overtravel spring in the deformation process can be avoided, the abrasion is avoided, and the service performance of the permanent magnet mechanism is ensured.

The permanent magnet mechanism realizes the built-in of the over travel spring, can provide the pressure of the over travel spring, is stable and reliable, directly provides the set over travel through the structural arrangement and the dimensional precision, is directly in transmission connection with the moving end of the circuit breaker when matched with the circuit breaker, does not need to be adjusted, reduces the over travel spring assembly of a transmission loop of the matched circuit breaker, simplifies the structure of a transmission system of the circuit breaker, can improve the reliability and the stability of the operation of the circuit breaker, reduces the manufacturing cost and the debugging difficulty of products, and reduces the labor intensity.

In other embodiments of the integrated permanent magnet mechanism with the built-in over travel spring, the second guide sleeve can be not fixed on the static iron core, and the static iron core is directly guided by the first guide sleeve, or the transmission rod and the static iron core are directly guided and matched.

In other embodiments of the integrated permanent magnet mechanism with the built-in overtravel spring, the static iron core is not provided with an extension hole, and the opening spring is directly pressed on the end surface of the static iron core.

In other embodiments of the integrated permanent magnet mechanism with the built-in over travel spring, the end cover can be not fixed with the first guide sleeve, so that the transmission rod can be directly matched with the end cover in a guide manner.

In other embodiments of the integrated permanent magnet mechanism with the built-in overtravel spring, the stopping sleeve is not provided with a stopping step, and the transmission rod is also not provided with a limiting step, so that the position of the stopping sleeve is controlled only by the nut.

In other embodiments of the integrated permanent magnet mechanism with the built-in over travel spring, the stopping member may include a stopping sleeve and a pin shaft, and the pin shaft is arranged on the transmission rod in a penetrating manner to limit the stopping sleeve; or the stopping piece only consists of one nut, and the nut is in threaded connection with the transmission rod and directly supports and presses the compression spring; or the stopping piece is composed of a pin shaft, and the pin shaft penetrates through the transmission rod and presses the compression spring.

In other embodiments of the integrated permanent magnet mechanism with the built-in overtravel spring, the limiting component may not include a compression spring, but only include a stopping piece, and the stopping piece is fixed on the transmission rod and directly pushes against the movable iron core.

In other embodiments of the integrated permanent magnet mechanism with the built-in over travel spring, the permanent magnet mechanism may not include an end cover, and at this time, a limiting member needs to be disposed at one end of the transmission rod extending out of the stationary iron core to limit the opening positions of the transmission rod and the movable iron core.

In other embodiments of built-in overtravel spring integration permanent magnetism mechanism, the one end of keeping away from quiet iron core of moving the iron core can not set up the end plate integrally, moves the whole open cover tube in both ends of iron core and form, and for the installation overtravel spring this moment, need be in the tip of moving the iron core fixed end plate in addition.

In other embodiments of the integrated permanent magnet mechanism with the built-in overtravel spring, two ends of the coil framework are not pressed on the support ring, the guide ring and the static iron core, but are additionally provided with a fixing structure.

In other embodiments of the integrated permanent magnet mechanism with an internal overtravel spring, the support ring may be separately fixedly mounted within the housing rather than on the support ring;

in other embodiments of the integrated permanent magnet mechanism with the built-in overtravel spring, the permanent magnet can be directly bonded or pressed in the shell instead of being fixed by the support ring.

In other embodiments of the integrated permanent magnet mechanism with the built-in overtravel spring, the shell can be not provided with a guide ring, and the movable iron core is guided only by the annular boss on the transmission rod; furthermore, the annular boss is only used for jacking and installing the opening spring and the overtravel spring and is not in guide fit with the movable iron core, and the movable iron core can be in guide fit with the coil framework at the moment.

The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, the scope of the present invention is defined by the appended claims, and all structural changes that can be made by using the contents of the description and the drawings of the present invention are intended to be embraced therein.