CN218471877U - Movable contact structure - Google Patents

Abstract

The utility model discloses a moving contact structure, which belongs to the technical field of circuit breakers and comprises a mounting seat, a moving contact and a torsional spring, wherein a mounting groove is arranged in the mounting seat, two opposite sides in the mounting groove along a first direction are provided with a containing groove, the containing groove is provided with an opening along a second direction, and the mounting seat is provided with two clamping parts which are arranged in one-to-one correspondence with the containing groove; the first end of the moving contact is rotatably arranged in the mounting groove; the torsional spring sets up in the mounting groove, and the torsional spring includes two torque rings that set up along the first direction interval, set up butt arm between the inboard of two torque rings and set up the joint arm in the outside of torque ring, butt arm and the first end butt of moving contact, and torque ring one-to-one is arranged in the storage tank and the periphery side of at least part torque ring is laminated with the internal surface of storage tank, and the joint arm is worn to establish storage tank and joint portion joint. The utility model provides a movable contact structure does not advance line location with the help of the axle and also can be with the restriction of torsion circle firmly in the storage tank.

Description

Movable contact structure

Technical Field

The utility model relates to a circuit breaker technical field especially relates to a moving contact structure.

Background

The circuit breaker is a switching device capable of closing, carrying, and opening/closing a current under a normal circuit condition and a current under an abnormal circuit condition within a prescribed time.

At present, a contact spring in a circuit breaker contact system needs to be positioned by means of a shaft in a function realization process, the assembly is time-consuming, and meanwhile, the spring deformation is easily caused in the assembly process, the product performance is influenced, even the function is lost, and the product power utilization safety is caused.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a movable contact structure, convenient assembly, and can not cause the spring to warp.

To achieve the purpose, the utility model adopts the following technical proposal:

a movable contact structure is provided for a circuit breaker, the movable contact structure comprising:

the mounting seat can be mounted in the circuit breaker, a mounting groove is formed in the mounting seat, accommodating grooves are formed in two opposite sides of the mounting groove along a first direction, openings are formed in the accommodating grooves along a second direction, and two clamping parts which correspond to the accommodating grooves in a one-to-one mode are arranged on the mounting seat;

the first end of the moving contact is rotatably arranged in the mounting groove, and the second end of the moving contact extends out of the mounting groove to be provided with a moving contact;

the torsion spring is arranged in the mounting groove and comprises two torsion rings arranged at intervals along the first direction, a butting arm arranged between the inner sides of the two torsion rings and a clamping arm arranged on the outer side of the torsion ring; wherein the content of the first and second substances,

the abutting arm abuts against the first end of the moving contact;

the torsion ring is arranged in the accommodating groove in a one-to-one correspondence mode, at least part of the outer peripheral side of the torsion ring is attached to the inner surface of the accommodating groove, and the clamping arm penetrates through the accommodating groove and is clamped with the clamping portion.

Preferably, in the process of switching the mounting seat from the open position to the closed position, the movable contact can rotate from the first position to the second position so as to enable the movable contact to abut against a stationary contact in the circuit breaker, and the movable contact can drive the abutting arm to rotate so as to enable the two torsion rings to accumulate elastic potential energy;

in the process that the mounting seat is converted from the closed position to the open position, elastic potential energy accumulated by the two torsion rings can drive the movable contact to rotate from the second position to the first position through the abutting arm.

Preferably, an auxiliary shaft is arranged at the first end of the movable contact, two ends of the auxiliary shaft extend along the first direction in a back-to-back manner, and the peripheral sides of the two ends of the auxiliary shaft are abutted to the abutting arms.

Preferably, the clamping portion includes a transition side line, and when the movable contact is located at the first position, an included angle a between a connecting line L1 between the transition side line and the axis of the torsion ring and a connecting line L2 between the axis of the torsion ring and the axis of the auxiliary shaft is an acute angle.

Preferably, the movable contact is connected to the mounting base through a shaft, the shaft is farther from the first end of the movable contact than the auxiliary shaft, and an included angle b between a connecting line L3 between the axes of the shaft and the auxiliary shaft and an extension direction line L4 of the movable contact forms an obtuse angle.

Preferably, the abutting arm comprises two first extension sections connected with the torsion ring, and a transition section and a blocking arm section which are sequentially bent from the first extension sections, a self-holding groove is formed between the transition section and the blocking arm section, a first yielding section is arranged between the two blocking arm sections, the movable contact can be rotated from the second position to the third position by electromagnetic repulsion force generated by overcurrent of the circuit breaker, so that the movable contact is separated from the stationary contact, and the auxiliary shaft slides from the first extension section and is clamped in the self-holding groove.

Preferably, a reset blocking surface is arranged in the circuit breaker, the reset blocking surface can abut against the periphery of the second end of the moving contact so that the moving contact rotates from the third position to the first position, and the auxiliary shaft slides out of the self-holding groove and abuts against the first extension section.

Optionally, an included angle c between the first extending section and the transition section is an obtuse angle, and an included angle d between the transition section and the arm blocking section is an obtuse angle.

Preferably, the abutting arm comprises two second extending sections respectively connected with the torsion ring and a second yielding section arranged between the two second extending sections.

Preferably, the clamping arm includes the horizontal extension section of being connected with the torsion circle and by the clamping section of horizontal extension section bending type, the clamping section with joint portion joint.

Has the beneficial effects that:

when the movable contact structure provided by the utility model is installed, firstly, two torsion rings of the torsion spring are placed in the second direction from the opening of the containing groove, so that the clamping arm runs through the containing groove and is clamped with the clamping part; then arrange the first end of moving contact in the mounting groove and with the butt arm butt, accomplish the installation of torsional spring, simple to operate, and the condition that the torsional spring warp can not appear. Because of the periphery side of at least part torsion circle and the interior surface laminating of storage tank and joint arm and joint portion joint, even fix a position with the help of the axle and also can be with the torsion circle firmly the restriction in the storage tank, and then realized the location installation of torsional spring in the mounting groove, can not influence the performance of moving contact structure.

Drawings

Fig. 1 is a schematic partial structural view of a moving contact structure according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a moving contact structure according to an embodiment of the present invention;

fig. 3 is a schematic view of a movable contact in a first position according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a movable contact in a second position according to an embodiment of the present invention;

fig. 5 is a schematic view of a structure of a torsion spring according to an embodiment of the present invention;

fig. 6 is a schematic view of another perspective structure of the torsion spring according to the first embodiment of the present invention;

fig. 7 is a schematic structural diagram of a movable contact according to an embodiment of the present invention;

fig. 8 is a schematic view of a movable contact in a third position according to an embodiment of the present invention;

fig. 9 is a schematic diagram of an internal structure of a circuit breaker according to a first embodiment of the present invention;

fig. 10 is a schematic view of a mounting base according to an embodiment of the present invention;

fig. 11 is a schematic view of another perspective structure of a mounting base according to an embodiment of the present invention;

fig. 12 is a sectional view of a movable contact structure according to a second embodiment of the present invention;

fig. 13 is a schematic view of a structure of a torsion spring according to a second embodiment of the present invention;

fig. 14 is a schematic view of another perspective structure of the torsion spring according to the second embodiment of the present invention.

In the figure:

100. a mounting seat; 110. mounting grooves; 111. a containing groove; 112. a second limiting surface; 120. a clamping part; 121. a transition edge line; 130. a rotating shaft; 140. a limiting groove; 141. a first limiting surface; 150. a first through hole; 160. a through groove;

200. a moving contact; 201. a fixing hole; 202. a second through hole; 210. a movable contact; 220. an auxiliary shaft; 230. a shaft;

300. a torsion spring; 310. a torsion ring; 320. a butting arm; 321. a first extension section; 322. a transition section; 323. a blocking arm section; 324. a self-sustaining tank; 325. a first escape segment; 326. a second extension section; 327. a second escape segment; 330. a clamping arm; 331. a horizontally extending section; 332. a clamping section;

400. a circuit breaker; 410. a stationary contact; 420. and resetting the blocking surface.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

Example one

Referring to fig. 1 to 6, the present embodiment provides a movable contact structure suitable for a circuit breaker 400, and the movable contact structure includes a mounting base 100, a movable contact 200, and a torsion spring 300. The mounting seat 100 can be installed in the circuit breaker 400, an installation groove 110 is formed in the mounting seat 100, accommodating grooves 111 are formed in two opposite sides of the installation groove 110 along a first direction, openings are formed in the accommodating grooves 111 along a second direction, and two clamping portions 120 which are in one-to-one correspondence with the accommodating grooves 111 are formed in the mounting seat 100; the first end of the moving contact 200 is rotatably arranged in the mounting groove 110, and the second end of the moving contact 200 extends out of the mounting groove 110 and is provided with a moving contact 210; the torsion spring 300 is disposed in the mounting groove 110, the torsion spring 300 includes two torsion rings 310 disposed at intervals along a first direction, an abutting arm 320 disposed between inner sides of the two torsion rings 310, and a clamping arm 330 disposed outside the torsion rings 310, the abutting arm 320 abuts against the first end of the movable contact 200, the torsion rings 310 are disposed in the accommodating groove 111 in a one-to-one correspondence manner, at least a portion of an outer peripheral side of the torsion rings 310 is attached to an inner surface of the accommodating groove 111, and the clamping arm 330 penetrates through the accommodating groove 111 and is clamped with the clamping portion 120. In fig. 1, the M direction is a first direction, and the N direction is a second direction.

When the device is installed, the two torsion loops 310 of the torsion spring 300 are firstly placed into the opening of the accommodating groove 111 along the second direction, so that the clamping arm 330 penetrates through the accommodating groove 111 and is clamped with the clamping portion 120; then, the first end of the moving contact 200 is arranged in the mounting groove 110 and abutted against the abutting arm 320, so that the installation of the torsion spring 300 is completed, the installation is convenient, and the deformation of the torsion spring 300 cannot occur. Because the peripheral side of at least part of the torsion ring 310 is attached to the inner surface of the accommodating groove 111 and the clamping arm 330 is clamped with the clamping portion 120, the torsion ring 310 can be firmly limited in the accommodating groove 111 even if the torsion ring is positioned without the help of a shaft, so that the torsion spring 300 can be positioned and installed in the installation groove 110, and the use performance of the movable contact structure cannot be influenced.

Specifically, the working principle of the movable contact structure is as follows: in the process of switching the mounting seat 100 from the open position to the closed position, the movable contact 200 can rotate from the first position to the second position to make the movable contact 210 abut against the stationary contact 410 in the circuit breaker 400, and the movable contact 200 can drive the abutting arm 320 to rotate to make the two torsion rings 310 accumulate elastic potential energy. When the movable contact 200 is in the second position, the movable contact 200 is in a suspended state, and the movable contact 210 can be stably abutted against the stationary contact 410 by the torsion spring 300, so that the condition of virtual connection is prevented. In addition, in the process of switching the mounting seat 100 from the closed position to the open position, the elastic potential energy accumulated by the two torsion rings 310 can drive the movable contact 200 to rotate from the second position to the first position through the abutting arm 320, and the stability of the movable contact 200 on the mounting seat 100 can be ensured through the design of the torsion spring 300, so as to effectively prevent the movable contact 200 from oscillating back and forth to cause the virtual connection.

It should be noted that, as shown in fig. 2, the mounting base 100 may be provided in plurality and fixed to the rotating shaft 130, and the mounting base 100 is rotatably installed in the circuit breaker 400 through the rotating shaft 130. Of course, the movable contacts 200 and the torsion springs 300 are provided in plural and are arranged corresponding to the mounting seats 100 one by one.

In this embodiment, when the elastic potential energy of the torsion spring 300 is large enough, the mounting base 100 is placed in the closed position, and the movable contact 200 is located at the first position and does not rotate under the elastic potential energy of the torsion spring 300, that is, the first position and the second position may be the same position.

In this embodiment, as shown in fig. 2, the mounting seat 100 is provided with a limiting groove 140 communicated with the mounting groove 110, the second end of the movable contact 200 is disposed in the limiting groove 140 in a penetrating manner, and two side surfaces of the movable contact 200 along the first direction are both attached to the inner surface of the limiting groove 140, so as to position the movable contact 200 relative to the mounting seat 100 along the first direction.

Further, the limiting groove 140 has a first limiting surface 141, the mounting groove 110 has a second limiting surface 112, and the movable contact 200 can be stably maintained at the first position by the first limiting surface 141 and the second limiting surface 112. Of course, referring to fig. 3, when the movable contact 200 is in the first position, the second position-limiting surface 112 may not contact the movable contact 200.

In this embodiment, the first end of the movable contact 200 is provided with the auxiliary shaft 220, two ends of the auxiliary shaft 220 extend along the first direction in a back-to-back manner, and the two ends of the auxiliary shaft 220 are circumferentially abutted against the abutting arms 320, so that the structure is simple and the assembly is convenient.

Further, referring to fig. 7, a fixed hole 201 is formed on the movable contact 200, and the auxiliary shaft 220 is inserted into the fixed hole 201. In this embodiment, the auxiliary shaft 220 may be fixed in the fixing hole 201 by riveting.

In this embodiment, referring to fig. 3, 7, 10 and 11, the clamping portion 120 includes a transition edge 121, and when the movable contact 200 is disposed at the first position, an included angle a between a connection line L1 between the transition edge 121 and the axis of the torsion ring 310 and a connection line L2 between the axes of the torsion ring 310 and the auxiliary shaft 220 is an acute angle, so as to effectively ensure smooth movement of the movable contact 200.

Further, the movable contact 200 is connected to the mounting base 100 through the shaft 230, the shaft 230 is farther away from the first end of the movable contact 200 than the auxiliary shaft 220, and an included angle b between a connection line L3 between the axes of the shaft 230 and the auxiliary shaft 220 and an extension line L4 of the movable contact 200 forms an obtuse angle, so that the movable contact 200 can move more smoothly.

Specifically, the mounting base 100 is provided with a first through hole 150, the movable contact 200 is provided with a second through hole 202, and the shaft 230 penetrates through the first through hole 150 and the second through hole 202 to rotatably connect the movable contact 200 with the mounting base 100.

In this embodiment, as shown in fig. 3 to 6 and 8, the abutting arm 320 includes two first extending sections 321 respectively connected to the torsion coil 310, and a transition section 322 and a blocking arm section 323 sequentially bent from the first extending sections 321, a self-holding groove 324 is formed between the transition section 322 and the blocking arm section 323, a first relief section 325 is disposed between the two blocking arm sections 323, an electromagnetic repulsion generated by an overcurrent of the circuit breaker 400 can rotate the movable contact 200 from the second position to the third position to separate the movable contact 210 from the stationary contact 410, and the auxiliary shaft 220 slides from the first extending section 321 and is clamped in the self-holding groove 324, so as to rapidly cut off the current, which will not cause arc reignition due to the fact that the movable contact 210 falls back to the stationary contact 410 after repulsion and repels apart. In this embodiment, the auxiliary shaft 220 is fixed in the blocking arm 323 in the self-supporting groove 324 in a limited manner, the movable contact 210 is separated from the fixed contact 410, and the circuit breaker 400 is opened to eliminate the electromagnetic repulsion, thereby effectively preventing the movable contact 210 from being abutted against the fixed contact 410 again to cause a safety problem. In addition, the first relief section 325 connects the torsion springs 300 into a whole and spatially relieves the moving contact 200, and the first relief section 325 can improve the action consistency between the two first extending sections 321 and the two torsion rings 310.

Referring to fig. 3, 4 and 8, the first position, the second position and the third position in this embodiment are deflection positions of the movable contact 200 relative to the mounting base 100.

In this embodiment, referring to fig. 9, a reset blocking surface 420 is disposed in the circuit breaker 400, the reset blocking surface 420 can abut against the periphery of the second end of the movable contact 200 to rotate the movable contact 200 from the third position to the first position, and the auxiliary shaft 220 slides out of the holding groove 324 and abuts against the first extending section 321. In this embodiment, when the circuit breaker 400 is in an overcurrent state to place the movable contact 200 at the third position, the mounting seat 100 is switched from the closed position to the open position, the reset blocking surface 420 abuts against the second end periphery of the movable contact 200 and provides a force for forcing the movable contact 200 to rotate from the third position to the first position, the auxiliary shaft 220 slides out of the self-holding groove 324 and again abuts against the first extending section 321, and when the mounting seat 100 is switched from the open position to the closed position, the movable contact 210 can again abut against the fixed contact 410, so that the use performance of the movable contact structure is ensured and the safety is improved.

It should be noted that, referring to fig. 6, the included angle c between the first extending section 321 and the transition section 322 is an obtuse angle, which is beneficial for the auxiliary shaft 220 to slide out of the self-supporting groove 324 and to abut against the first extending section 321 again.

Furthermore, an included angle d between the transition section 322 and the blocking arm section 323 is an obtuse angle, and when the auxiliary shaft 220 slides from the first extending section 321 and is clamped in the self-holding groove 324, the transition section 322 and the blocking arm section 323 do not excessively press the auxiliary shaft 220 and clamp the auxiliary shaft 220, so as to ensure that the auxiliary shaft 220 can slide out of the self-holding groove 324.

In this embodiment, referring to fig. 3, 6, and 10 to 11, the through groove 160 is disposed at the bottom of the accommodating groove 111 along the second direction, and the latch arm 330 is disposed through the through groove 160 and latched with the latch portion 120, so that the structure is simple and the assembly of the torsion spring 300 is facilitated.

Further, the clamping arm 330 includes a horizontal extension 331 connected to the torque ring 310 and a clamping section 332 bent from the horizontal extension 331, and the clamping section 332 is clamped with the clamping portion 120. In the present embodiment, the horizontal extension 331 passes through the through slot 160 from the receiving slot 111, so that the clamping section 332 is disposed at the clamping portion 120 and clamped with the clamping portion 120.

Further, the clamping portion 120 is configured as a clamping groove, and the clamping section 332 is clamped in the clamping groove, so that the assembly is convenient.

Specifically, a transition edge 121 is formed between the snap groove and the through groove 160.

Exemplarily, the assembling process of the movable contact structure is specifically as follows:

first, the two torsion loops 310 of the torsion spring 300 are inserted from the opening of the receiving groove 111 along the second direction, and in the process, the horizontally extending section 331 passes through the through groove 160 from the receiving groove 111 and the engaging section 332 is placed at the engaging groove for engaging.

Then, the first end of the movable contact 200 is placed in the mounting groove 110 and pressed against the abutting arm 320 by the auxiliary shaft 220, and the shaft 230 is inserted into the first through hole 150 and the second through hole 202 to rotatably connect the movable contact 200 with the mounting seat 100, thereby completing the assembly of the movable contact structure.

Illustratively, the working principle of the movable contact structure is specifically as follows:

in the process of switching the mounting seat 100 from the open position to the closed position, after the movable contact 210 abuts against the fixed contact 410, the movable contact 200 deflects from the first position to the second position relative to the mounting seat 100, and the movable contact 200 can drive the abutting arm 320 to rotate so as to enable the two torsion rings 310 to accumulate elastic potential energy; in the process of switching the mounting seat 100 from the closed position to the open position, under the action of the elastic potential energy of the torsion spring 300, the movable contact 200 is deflected from the second position to the first position relative to the mounting seat 100, and the movable contact 200 is separated from the stationary contact.

When the circuit breaker 400 is in an overcurrent state, at the initial repulsion stage, electromagnetic repulsion causes the movable contact 200 to rotate from the second position to the third position relative to the mounting base 100 so as to separate the movable contact 210 from the stationary contact 410, the auxiliary shaft 220 slides from the first extension section 321 and is clamped in the self-holding groove 324, and the auxiliary shaft 220 is limited and fixed at the arm blocking section 323, so that current is quickly cut off, a power supply is disconnected, and arc reignition caused by the fact that the movable contact 210 falls back after repulsion and then is in contact with the stationary contact 410 again and repeals is avoided.

When the overcurrent is identified by the protection module of the circuit breaker 400, the circuit breaker 400 trips, the mounting base 100 is switched from the closed position to the open position, the reset blocking surface 420 abuts against the second end periphery of the moving contact 200, so that the moving contact 200 is forced to rotate from the third position to the first position, the auxiliary shaft 220 slides out from the self-holding groove 324 and abuts against the first extension section 321 again, and therefore the purpose of safe power utilization is achieved, and the sectioning capability and the short-circuit protection capability of the circuit breaker 400 are improved.

Example two

The abutting arm 320 of the torsion spring 300 in the moving contact structure provided in this embodiment is different from the first embodiment, in this embodiment, as shown in fig. 12 to 14, the abutting arm 320 includes two second extending sections 326 respectively connected to the torsion ring 310 and a second relief section 327 disposed between the two second extending sections 326, when the mounting base 100 is switched from the open position to the closed position, the mounting base 100 drives the moving contact 200 to rotate toward the stationary contact 410, and after the moving contact 210 abuts against the stationary contact 410, the moving contact 200 deflects relative to the mounting base 100, and the operation is smooth and reliable, the auxiliary shaft 220 slides relative to the second extending section 326 and pushes the second extending section 326 to accumulate elastic potential energy in the torsion ring 310, so as to increase the pressure of the moving contact 210 on the stationary contact 410, thereby achieving the stability of the connection between the moving contact 210 and the stationary contact 410.

In the present embodiment, the second relief section 327 connects the torsion springs 300 into a whole and spatially relieves the moving contact 200, and the second relief section 327 can improve the action consistency between the two second extending sections 326 and the two torsion rings 310.

Other structures of the moving contact structure provided in this embodiment are the same as those of the first embodiment, and are not described in detail herein. It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A movable contact structure for a circuit breaker (400), the movable contact structure comprising:

the mounting seat (100) can be mounted in the circuit breaker (400), a mounting groove (110) is formed in the mounting seat (100), accommodating grooves (111) are formed in two opposite sides of the mounting groove (110) along a first direction, openings are formed in the accommodating grooves (111) along a second direction, and two clamping portions (120) which correspond to the accommodating grooves (111) in a one-to-one mode are arranged on the mounting seat (100);

the moving contact (200), the first end of the moving contact (200) is rotatably arranged in the mounting groove (110), and the second end of the moving contact (200) extends out of the mounting groove (110) and is provided with a moving contact (210);

the torsion spring (300) is arranged in the mounting groove (110), and the torsion spring (300) comprises two torsion rings (310) which are arranged at intervals along the first direction, an abutting arm (320) which is arranged between the inner sides of the two torsion rings (310), and a clamping arm (330) which is arranged on the outer side of the torsion rings (310); wherein the content of the first and second substances,

the abutting arm (320) abuts against a first end of the movable contact (200);

the torsion ring (310) is arranged in the accommodating groove (111) in a one-to-one correspondence mode, at least part of the outer peripheral side of the torsion ring (310) is attached to the inner surface of the accommodating groove (111), and the clamping arm (330) penetrates through the accommodating groove (111) and is clamped with the clamping portion (120).

2. A movable contact structure according to claim 1, wherein during the process of switching the mounting seat (100) from the open position to the closed position, the movable contact (200) can rotate from the first position to the second position to make the movable contact (210) abut against the stationary contact (410) in the circuit breaker (400), and the movable contact (200) can drive the abutting arm (320) to rotate to make the two torsion rings (310) accumulate elastic potential energy;

in the process that the mounting seat (100) is switched from the closed position to the open position, elastic potential energy accumulated by the two torsion rings (310) can drive the movable contact (200) to rotate from the second position to the first position through the abutting arm (320).

3. A movable contact structure according to claim 2, wherein an auxiliary shaft (220) is disposed at a first end of the movable contact (200), two ends of the auxiliary shaft (220) extend along the first direction, and the peripheral sides of the two ends of the auxiliary shaft (220) are abutted against the abutting arms (320).

4. The moving contact structure according to claim 3, wherein the snap-in portion (120) includes a transition edge line (121), and when the moving contact (200) is placed in the first position, an included angle a between a connecting line L1 between the transition edge line (121) and an axis of the torsion ring (310) and a connecting line L2 between the torsion ring (310) and an axis of the auxiliary shaft (220) is acute.

5. A moving contact structure according to claim 3, characterized in that the moving contact (200) is connected to the mounting base (100) through a shaft (230), the shaft (230) is further away from the first end of the moving contact (200) than the auxiliary shaft (220), and an included angle b between a line L3 connecting the axes of the shaft (230) and the auxiliary shaft (220) and a line L4 along which the moving contact (200) extends is obtuse.

6. The moving contact structure according to claim 3, wherein the abutting arm (320) includes two first extending sections (321) respectively connected to the torsion ring (310), and a transition section (322) and a blocking arm section (323) sequentially bent from the first extending section (321), a self-holding groove (324) is formed between the transition section (322) and the blocking arm section (323), a first avoidance section (325) is disposed between the two blocking arm sections (323), an electromagnetic repulsion force generated by an overcurrent in the circuit breaker (400) can rotate the moving contact (200) from the second position to a third position to separate the moving contact (210) from the stationary contact (410), and the auxiliary shaft (220) slides from the first extending section (321) and is clamped in the self-holding groove (324).

7. A movable contact structure according to claim 6, wherein a reset stop surface (420) is disposed in the circuit breaker (400), the reset stop surface (420) can abut against the second end periphery side of the movable contact (200) to rotate the movable contact (200) from the third position to the first position, and the auxiliary shaft (220) slides out of the self-holding groove (324) and abuts against the first extension section (321).

8. A movable contact structure according to claim 6, wherein an angle c between the first extension (321) and the transition section (322) is obtuse, and an angle d between the transition section (322) and the arm blocking section (323) is obtuse.

9. A moving contact structure according to claim 1, wherein said abutting arm (320) comprises two second extension segments (326) respectively connected to said torsion ring (310) and a second relief segment (327) disposed between said two second extension segments (326).

10. The moving contact structure of any one of claims 1 to 9, characterized in that the snap-in arm (330) comprises a horizontal extension section (331) connected with the torsion ring (310) and a snap-in section (332) bent from the horizontal extension section (331), wherein the snap-in section (332) is snapped in the snap-in section (120).

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