CN209981122U - Tripping protection mechanism and circuit breaker - Google Patents

Abstract

A tripping protection mechanism comprises a magnetic yoke and an armature which is pivotally arranged on one side of the magnetic yoke, wherein two relatively arranged pivotal side plates are arranged on one side of the magnetic yoke, the armature comprises pivotal rods arranged on the two pivotal side plates, and an actuation part and an unlocking part which are respectively arranged on two sides of the pivotal rods and matched with the magnetic yoke, the actuation part and the operation mechanism are matched, the two pivotal side plates are respectively provided with a pivotal hole, two isolating sleeves are respectively arranged in the two pivotal holes, the two isolating sleeves in the two pivotal holes are respectively sleeved at two ends of the pivotal rods, one side of each of the two pivotal holes is respectively provided with an inlet for avoiding the pivotal rods, the inner diameter of each inlet is smaller than the outer diameter of each isolating sleeve, each isolating sleeve not only can play a role of limiting the pivotal rods, but also can play an isolated role between. The utility model discloses the creation still provides a circuit breaker, include dropout protection mechanism, just can realize spacing the separation sleeve when the casing is installed to the dropout protection unit.

Description

Tripping protection mechanism and circuit breaker

Technical Field

The invention relates to the field of low-voltage electric appliances, in particular to a tripping protection mechanism and a circuit breaker.

Background

The overload protection and the short-circuit protection of the circuit breaker are completed by a tripping protection mechanism, and when a short-circuit large current appears in a circuit, a magnetic yoke of the tripping protection mechanism attracts an armature to trip the circuit breaker, so that the purpose of protecting the circuit is achieved. The existing tripping protection mechanism provides an armature rotating fulcrum for a bracket riveted on a magnetic yoke, so that the connection mode is complex and the assembly process is complicated. Particularly, when the force value of a counter spring used by the small ampere circuit breaker is small, the shaking of the circuit breaker in the transportation process or the movement of the armature in the suction process can cause the armature to fall off from the bracket and influence the stability of the short circuit action characteristic. However, if the pivot of the armature is directly attached to the yoke, the short-circuit operation value of the armature is likely to be unstable when the magnetic circuit is turned on.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a tripping protection mechanism with simple structure and high reliability.

In order to achieve the purpose, the invention adopts the following technical scheme:

a tripping protection mechanism comprises a magnetic yoke 23 and an armature 21 which is pivotally arranged on one side of the magnetic yoke 23, wherein two opposite pivoting side plates 233 are arranged on one side of the magnetic yoke 23, the armature 21 comprises a pivoting rod 211 arranged on the two pivoting side plates 233, an attraction part 213 which is respectively arranged on two sides of the pivoting rod 211 and is matched with the magnetic yoke 23 and an unlocking part 212 which is respectively arranged on two sides of the pivoting rod 211 and is matched with an operating mechanism 12, pivoting holes 234 are respectively arranged on the two pivoting side plates 233, isolating sleeves 235 are respectively arranged in the two pivoting holes 234, the isolating sleeves 235 in the two pivoting holes 234 are respectively sleeved on two ends of the pivoting rod 211, an inlet 236 which is used for avoiding the pivoting rod 211 is respectively arranged on one side of the two pivoting holes 234, and the inner diameter of the inlet 236 is.

Preferably, the bimetal strip 24 is further included, one end of the bimetal strip 24 is connected with the connecting mechanism 20, the other end of the bimetal strip 24 is matched with the operating mechanism 12, the connecting mechanism 20 comprises a thermal element 25 and a connecting piece 26 which are connected, the other end of the thermal element 25 is connected with the contact mechanism, the other end of the connecting piece 26 is connected with the connecting terminal 13, and the bimetal strip 24 and the magnetic yoke 23 are respectively arranged on two sides of the thermal element 25.

Preferably, the attraction portion 213 and the pivot rod 211 are connected by a relief portion 216, the width of the relief portion 216 is smaller than that of the attraction portion 213, and relief grooves 217 for relieving the pivot side plates 233 are respectively formed at both sides of the relief portion 216.

Preferably, the yoke 23 is U-shaped, the yoke 23 includes two yoke side plates 231 disposed opposite to each other and a yoke transverse plate 232 connected between one ends of the two yoke side plates 231, a bimetal 24 and a thermal element 25 are disposed inside the yoke 23, the yoke transverse plate 232 is connected to one side of the thermal element 25, the bimetal 24 is connected to the other side of the thermal element 25, the attracting portion 213 of the armature 21 is engaged with a side of the two yoke side plates 231 away from the yoke transverse plate 232, the two pivoting side plates 233 are disposed parallel to the two yoke side plates 231, and are connected to top ends of the two yoke side plates 231 away from the yoke transverse plate 232.

Preferably, the cross section of the pivot rod 211 in the vertical direction is rectangular, the inner diameter of the inlet 236 is greater than the length of the short side of the cross section of the pivot rod 211 in the vertical direction and less than the length of the long side of the cross section of the pivot rod 211 in the vertical direction, and the long side of the cross section of the pivot rod 211 in the vertical direction can rotate to the horizontal direction to form a limit fit with the inlet 236.

Preferably, the isolation sleeve 235 is a ring-shaped non-magnetic conductive isolation sleeve, and the pivot hole 234 is circular and is matched with the outer wall of the isolation sleeve 235.

Preferably, the unlocking portion 212 of the armature 21 is U-shaped, the unlocking portion 212 includes a reaction rod 2121 and an unlocking rod 2122 respectively disposed at both sides of the coupling mechanism, one end of the reaction rod 2121 and the unlocking rod 2122 is respectively connected to one side of the pivot rod 211, the other end of the reaction rod 2121 is connected to the yoke 23 through a reaction spring 22, the other end of the unlocking rod 2122 is engaged with the operating mechanism 12, and a space for avoiding the coupling mechanism and the bimetal 24 is formed between the reaction rod 2121 and the unlocking rod 2122, which has a compact structure.

Preferably, the unlocking lever 2122 is U-shaped and is convexly folded towards one side of the coupling mechanism, the unlocking lever 2122 comprises a first unlocking arm 2141 and a third unlocking arm 2143 which are oppositely arranged, and a second unlocking arm 2142 connected between the first unlocking arm 2141 and one end of the third unlocking arm 2143, the second unlocking arm 2142 is located at one side of the coupling mechanism, the other end of the first unlocking arm 2141 is connected with the pivot rod 211, and the other end of the third unlocking arm 2143 is matched with the operating mechanism 12; the coupling 26 is L-shaped, the coupling 26 includes a first coupling plate 261 and a second coupling plate 262 connected, the other end of the first coupling plate 261 is connected with the thermal element 25, and the other end of the second coupling plate 262 is connected with the connection terminal; the heating element 25 is L-shaped, the heating element 25 comprises a first heating plate 251 and a second heating plate 252 which are connected, the other end of the first heating plate 251 is connected with the connecting piece 26, and the other end of the second heating plate 252 is connected with the contact mechanism.

According to the tripping protection mechanism provided by the invention, two ends of the pivot rod 211 respectively penetrate through the inlet 236 to be installed in the pivot hole 234, and then the isolation sleeve 235 is aligned with the end of the pivot rod 211 from the vertical direction to be installed in the pivot hole 211, so that the isolation sleeve 235 not only can play a role of limiting the pivot rod 211, and the pivot rod 211 is reliably installed on the pivot side plate 233 and cannot fall off, but also the isolation sleeve 235 can play an isolation role between the armature 21 and the bayonet lug 23, and the effect of stabilizing a magnetic circuit is achieved.

In addition, the pivot rod 211 is in sliding fit with the inner wall of the isolation sleeve 235 through the edge of the rectangle with the vertical section, after the pivot rod 211 enters the pivot hole 234, the pivot rod 211 rotates under the driving of different gravity of the unlocking part 212 and the attraction part 213, so that the long edge of the vertical section of the pivot rod 211 rotates towards the horizontal direction and forms limit fit with the inlet 236, the armature 21 can be prevented from falling off from the magnetic yoke 23 before the isolation sleeve 235 is assembled, the friction force can be reduced, the action sensitivity of the armature 21 is improved, meanwhile, the abrasion is reduced, and the service life of the tripping protection mechanism is prolonged.

The invention also provides a circuit breaker, which comprises a shell 11, a contact mechanism arranged in the shell 11, an operating mechanism 12, a transmission mechanism 15 and a tripping protection mechanism, wherein the contact mechanism comprises a moving contact 14 and a fixed contact which are respectively arranged at two sides of the operating mechanism 12, the moving contact 14 and the fixed contact are respectively connected into a circuit through a plurality of wiring terminals 13, the fixed contact is connected with the wiring terminal 13 at one end of the shell 11 through the tripping protection mechanism, the transmission mechanism 15 is correspondingly arranged above the fixed contact and positioned between the operating mechanism 12 and the tripping protection mechanism, the moving contact 14 is connected with the wiring terminal 13 at the other end of the shell 11, the operating mechanism 12 can drive the moving contact 14 to be in contact with the fixed contact, and the tripping protection mechanism can unlock the operating mechanism 12 through the transmission mechanism 15 to drive the moving.

Preferably, the circuit breaker includes three contact units, each contact unit includes a contact mechanism and a tripping protection mechanism respectively connected with the contact mechanism, the moving contacts 14 of the three contact mechanisms are respectively connected with the operating mechanism 12, the three tripping protection mechanisms are respectively matched with the transmission mechanism 15, the housing 11 is provided with a partition 17 extending to the side surface of the pivoting side plate 233 between the contact units, and horizontal limiting protrusions 16 in limiting fit with the isolating sleeve 235 are respectively arranged on both sides of the side wall of the partition 17 and the inner side of the side wall of the housing 11.

According to the circuit breaker, the horizontal limiting protrusions 16 which are in limiting fit with the isolating sleeve 235 are arranged on the two sides of the side wall of the partition 17 and the inner side of the side wall of the shell 11, other limiting mechanisms are not needed, the tripping protection unit can limit the isolating sleeve 235 when being installed on the shell 11, and the circuit breaker has the advantages of being simple in structure, small in size, low in cost and convenient to assemble.

Drawings

Fig. 1 is a schematic structural diagram of a circuit breaker;

FIG. 2 is an enlarged view of a portion of FIG. 1;

FIG. 3 is a schematic structural view of a trip protection mechanism;

FIG. 4 is an exploded view of the trip protection mechanism;

FIG. 5 is a schematic view of the structure of the yoke;

fig. 6 is a schematic structural view of the armature.

Detailed Description

The following describes the embodiments of the trip protection mechanism according to the present invention with reference to fig. 1 to 6. The trip protection mechanism of the present invention is not limited to the description of the following embodiments.

As shown in fig. 1-2, the circuit breaker of the present invention includes a housing 11, and a contact mechanism, an operating mechanism 12 and a trip protection mechanism disposed in the housing 11, wherein the contact mechanism is connected to a line through a connection terminal, the operating mechanism 12 can drive the contact 14 mechanism to close to conduct the line, the trip protection mechanism can unlock the operating mechanism 12 when the line fails, and the operating mechanism 12 drives the contact 14 mechanism to open to cut off the line, so as to protect the line and a load connected to the line.

As shown in fig. 3, the inventive trip protection mechanism includes a link mechanism connected between the contact mechanism and the connection terminal, a yoke 23 provided on the link mechanism, and an armature 21 pivotally mounted on one side of the yoke 23, two pivot side plates 233 are provided on one side of the yoke 23, which are disposed opposite to each other, the armature 21 includes a pivot lever 211 provided on the two pivot side plates 233, and a pull-in part 213 and an unlock part 212 respectively arranged at both sides of the pivot rod 211 and engaged with the magnetic yoke 23, the two pivot side plates 233 are respectively provided with a pivot hole 234, the two pivot holes 234 are respectively provided with a spacer 235, the spacer 235 in the two pivot holes 234 are respectively sleeved at both ends of the pivot rod 211, an inlet 236 for avoiding the pivot rod 211 and arranged perpendicular to the installation direction of the isolation sleeve 235 is respectively arranged at one side of the two pivot holes 234, and the inner diameter of the inlet 236 is smaller than the outer diameter of the isolation sleeve 235 and larger than the outer diameter of the pivot rod 211.

According to the tripping protection mechanism provided by the invention, two ends of the pivot rod 211 respectively penetrate through the inlet 236 to be installed in the pivot hole 234, and then the isolation sleeve 235 is aligned with the end of the pivot rod 211 from the vertical direction to be installed in the pivot hole 211, so that the isolation sleeve 235 not only can play a role of limiting the pivot rod 211, and the pivot rod 211 is reliably installed on the pivot side plate 233 and cannot fall off, but also the isolation sleeve 235 can play an isolation role between the armature 21 and the bayonet lug 23, and the effect of stabilizing a magnetic circuit is achieved.

Further, the tripping protection mechanism further comprises a bimetallic strip 24, one end of the bimetallic strip 24 is connected with the connecting mechanism, the other end of the bimetallic strip 24 is matched with the operating mechanism 12, the bimetallic strip 24 can be used for bending and unlocking the operating mechanism 12 due to temperature rise when a line is overloaded, so that overload protection of the line is realized, the connecting mechanism comprises a thermal element 25 and a connecting piece 26 which are connected, the other end of the thermal element 25 is connected with the contact mechanism, the other end of the connecting piece 26 is connected with a wiring terminal, and the bimetallic strip 24 and the magnetic yoke 23 are respectively arranged on two sides of the thermal element 25. Of course, the bimetal 24 may not be provided, that is, the trip protection mechanism does not have an over-protection function. In addition, the thermal element 25 is not needed, the bimetallic strip 24 can be bent by itself, and the thermal element 25 has the characteristics of simple structure and low cost.

Further, the attraction portion 213 and the pivot rod 211 are connected by a yielding portion 216, the width of the yielding portion 216 is smaller than that of the attraction portion 213, and yielding grooves 217 for yielding the pivot side plates 233 are respectively formed on both sides of the yielding portion 216.

Specifically, referring to a preferred embodiment shown in fig. 3 to 5, the yoke 23 is U-shaped, the yoke 23 includes two yoke side plates 231 disposed opposite to each other and a yoke cross plate 232 connected between one ends of the two yoke side plates 231, a bimetal 24 and a thermal element 25 are disposed inside the yoke 23, the yoke cross plate 232 is connected to one side of the thermal element 25, the bimetal 24 is connected to the other side of the thermal element 25, the engaging portion 213 of the armature 21 is engaged with a side edge of the two yoke side plates 231, which is away from the yoke cross plate 232, and the two pivoting side plates 233 are disposed parallel to the two yoke side plates 231 and connected to top ends of the two yoke side plates 231, which are away from the yoke cross plate 232.

Further, the pivoting side plate 233 is U-shaped and is opened upward in a vertical direction, the pivoting side plate 233 includes two pivoting side arms 2331 disposed opposite to each other and a pivoting cross arm 2332 connected between bottom ends of the two pivoting side arms 2331, one end of the pivoting cross arm 2332 is connected to the yoke side plate 231, a pivoting hole 234 having a center line disposed in a horizontal direction is formed between bottom portions of the two pivoting side arms 2331, and an inlet 236 opened upward in a vertical direction and communicating with a top side of the pivoting hole 234 is formed between top portions of the two pivoting side arms 2331. The pivot rod 211 can pass through the access opening 236 in the vertical direction and be installed in the pivot hole 234 first, and before the isolation sleeve 235 is installed, the pivot rod 211 is limited through the pivot hole 234, so that the assembly difficulty can be effectively reduced. Of course, it is within the scope of the present invention that access opening 236 may be open in another horizontal direction perpendicular to the centerline of pivot hole 234.

Further, the section of the pivot rod 211 in the vertical direction is rectangular, the inner diameter of the inlet 236 is larger than the length of the short side of the section of the pivot rod 211 in the vertical direction and smaller than the length of the long side of the section of the pivot rod 211 in the vertical direction, the short side of the section of the pivot rod 211 in the vertical direction can penetrate through the inlet 236 and enter the pivot hole 234 when the short side is downward, and after the pivot rod 211 enters the pivot hole 234, the pivot rod 211 rotates under the driving of different gravity of the unlocking part 212 and the attraction part 213 so that the long side of the section of the pivot rod 211 in the vertical direction rotates to the horizontal direction and forms limit fit with the inlet 236, so that the armature 21 can be prevented from falling off from the magnetic yoke. In addition, the pivot rod 211 is in sliding fit with the inner wall of the isolation sleeve 235 through the edge of the rectangle with the vertical section, so that not only can the friction force be reduced and the action sensitivity of the armature 21 be improved, but also the abrasion can be reduced and the service life of the tripping protection mechanism can be further prolonged.

Further, the isolating sleeve 235 is annular, the pivot hole 234 is circular and is matched with the outer wall of the isolating sleeve 235, the inner diameter of the inlet 236 gradually approaches to the inner side from top to bottom, the side walls on the two sides of the inlet 236 respectively form a leading-in inclined plane, the distance between the bottom ends of the two leading-in inclined planes is smaller than the diameter of the outer wall of the isolating sleeve 235, and a vertical limiting protrusion 237 in limit fit with the top side of the isolating sleeve 235 is respectively formed between the bottom ends of the two leading-in inclined planes and the pivot hole 234. Preferably, the isolation sleeve 235 is an annular non-magnetic isolation sleeve made of non-magnetic materials such as plastics, brass or stainless steel, and the like, and isolates the magnetic armature 21, and the outer wall of the isolation sleeve 235 is tightly matched with the pivot hole 234, so that the magnetic isolation effect is better, and the isolation sleeve 235 can be limited along the horizontal direction to prevent falling. Of course, it is within the scope of the present invention to form the spacer 235 from the same material as the yoke 23, or to form the outer wall of the spacer 235 into other shapes to form a tight fit with the pivot hole 234.

Referring to fig. 4, which shows a preferred embodiment of the coupling mechanism, the coupling member 26 is L-shaped, the coupling member 26 includes a first coupling plate 261 and a second coupling plate 262 connected, the other end of the first coupling plate 261 is connected to the thermal element 25, and the other end of the second coupling plate 262 is connected to the case and the connection terminal of the circuit breaker; the heating element 25 is L-shaped, the heating element 25 comprises a first heating plate 251 and a second heating plate 252 which are connected, the other end of the first heating plate 251 is connected with the connecting piece 26, and the other end of the second heating plate 252 is connected with the contact mechanism.

Referring to fig. 6, a preferred embodiment of the armature 21 is shown, the unlocking portion 212 of the armature 21 is U-shaped, the unlocking portion 212 includes a reaction rod 2121 and an unlocking rod 2122 respectively disposed at two sides of the coupling mechanism, one end of the reaction rod 2121 and one end of the unlocking rod 2122 are respectively connected to one side of the pivot rod 211, the other end of the reaction rod 2121 is connected to the yoke 23 through a reaction spring 22, the other end of the unlocking rod 2122 is matched with the operating mechanism 12, a space for avoiding the coupling mechanism and the bimetal strip 24 is formed between the reaction rod 2121 and the unlocking rod 2122, and the armature 21 has a compact structure.

Further, one end 1 of the suction portion 213 is connected to the pivot rod 211 through a relief portion 216, the width of the relief portion 216 is smaller than that of the suction portion 213, and relief grooves 217 for relieving the pivoting side plates 233 are formed on both sides of the relief portion 216.

Further, the unlocking rod 2122 is U-shaped and is convexly folded towards one side of the coupling mechanism, the unlocking rod 2122 includes a first unlocking arm 2141 and a third unlocking arm 2143 which are oppositely arranged, and a second unlocking arm 2142 connected between the first unlocking arm 2141 and one end of the third unlocking arm 2143, the second unlocking arm 2142 is located at one side of the coupling mechanism, the other end of the first unlocking arm 2141 is connected with the pivot rod 211, and the other end of the third unlocking arm 2143 is matched with the operating mechanism 12.

As shown in fig. 1-2, a preferred embodiment of a circuit breaker is shown, the circuit breaker created by the present invention includes a housing 11, and a contact mechanism, an operating mechanism 12, a transmission mechanism 15 and a trip protection mechanism, which are disposed in the housing 11, wherein the contact mechanism includes a moving contact 14 and a stationary contact respectively disposed at two sides of the operating mechanism 12, the moving contact 14 and the stationary contact are respectively connected to a circuit through a plurality of terminals, the stationary contact is connected to a terminal at one end of the housing 11 through the trip protection mechanism, the moving contact 14 is connected to a terminal at the other end of the housing 11, the transmission mechanism 15 is correspondingly disposed above the stationary contact and located between the operating mechanism 12 and the trip protection mechanism, the operating mechanism 12 can drive the moving contact 14 and the stationary contact to contact the closing contact mechanism to conduct the circuit, the trip protection mechanism can unlock the operating mechanism 12, the moving contact 14 is driven by the operating mechanism 12 to leave the static contact disconnecting contact mechanism so as to cut off the line, thereby realizing the protection of the line and the load of the access line, and a horizontal limiting bulge 16 which is in limiting fit with the isolating sleeve 235 is arranged on the inner side of the side wall of the shell 11.

Further, the circuit breaker comprises three contact units, each contact unit comprises a contact mechanism and a tripping protection mechanism respectively connected with the contact mechanism, moving contacts 14 of the three contact mechanisms are respectively connected with the operating mechanism 12, the three tripping protection mechanisms are respectively matched with the transmission mechanism 15, the shell 11 is correspondingly provided with a partition plate 17 extending to the side surface of the pivoting side plate 233 between the contact units, and horizontal limiting protrusions 16 in limiting fit with the isolating sleeve 235 are respectively arranged on two sides of the side wall of the partition plate 17 and the inner side of the side wall of the shell 11. Through the both sides at baffle 17 lateral wall and the inboard of casing 11 lateral wall all be equipped with spacing complex horizontal spacing arch 16 of spacer sleeve 235, need not additionally set up other stop gear, just can realize spacing spacer sleeve 235 when casing 11 is installed to the dropout protection unit, have simple structure, small, with low costs and convenient assembling's characteristics. Of course, it is within the scope of the present invention to provide a horizontal stop protrusion 16 on the housing 11 and the partition 17 by the close fit of the spacer 235 with the pivot hole 234.

The foregoing is a more detailed description of the invention, taken in conjunction with the accompanying preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the inventive concept, and all should be considered as falling within the protection scope of the invention.

Claims (10)

1. A tripping protection mechanism is characterized in that: comprises a magnetic yoke (23) and an armature (21) which is pivotally arranged on one side of the magnetic yoke (23), two pivoting side plates (233) which are oppositely arranged are arranged on one side of the magnetic yoke (23), the armature (21) comprises a pivoting rod (211) which is arranged on the two pivoting side plates (233), and a pull-in part (213) and an unlocking part (212) which are respectively arranged at the two sides of the pivoting rod (211) and are matched with the magnet yoke (23), the unlocking part (212) is matched with the operating mechanism (12), the two pivoting side plates (233) are respectively provided with a pivoting hole (234), the two pivoting holes (234) are respectively provided with an isolating sleeve (235), the isolating sleeves (235) in the two pivoting holes (234) are respectively sleeved at the two ends of the pivoting rod (211), an inlet (236) for avoiding the pivot rod (211) is respectively arranged at one side of the two pivot holes (234), and the inner diameter of the inlet (236) is smaller than the outer diameter of the isolation sleeve (235).

2. The trip protection mechanism of claim 1, wherein: the connecting mechanism (20) comprises a thermal element (25) and a connecting piece (26) which are connected, the other end of the thermal element (25) is connected with the contact mechanism, the other end of the connecting piece (26) is connected with the wiring terminal (13), and the bimetallic strip (24) and the magnetic yoke (23) are respectively arranged on two sides of the thermal element (25).

3. The trip protection mechanism of claim 1, wherein: the attraction part (213) is connected with the pivoting rod (211) through the yielding part (216), the width of the yielding part (216) is smaller than that of the attraction part (213), and yielding grooves (217) used for yielding the pivoting side plates (233) are formed on two sides of the yielding part (216) respectively.

4. The trip protection mechanism of claim 1, wherein: yoke (23) become the U type, yoke (23) include two yoke curb plates (231) that set up relatively and connect yoke diaphragm (232) between two yoke curb plates (231) one end, inboard at yoke (23) is equipped with bimetallic strip (24) and hot component (25), yoke diaphragm (232) are connected with one side of hot component (25), bimetallic strip (24) are connected with the opposite side of hot component (25), the side cooperation of yoke diaphragm (232) one side is kept away from with two yoke curb plates (231) actuation portion (213) of armature (21), two pivot curb plates (233) respectively with two yoke curb plates (231) parallel arrangement, and keep away from the top of yoke diaphragm (232) one side with two yoke curb plates (231) respectively and be connected.

5. The trip protection mechanism of claim 1, wherein: the section of the pivoting rod (211) in the vertical direction is rectangular, the inner diameter of the inlet (236) is larger than the length of the short side of the section of the pivoting rod (211) in the vertical direction and smaller than the length of the long side of the section of the pivoting rod (211) in the vertical direction, and the long side of the section of the pivoting rod (211) in the vertical direction can rotate to the horizontal direction to form limit fit with the inlet (236).

6. The trip protection mechanism of claim 1, wherein: the isolating sleeve (235) is an annular non-magnetic conducting isolating sleeve, and the pivot hole (234) is circular and matched with the outer wall of the isolating sleeve (235).

7. The trip protection mechanism of claim 2, wherein: the unlocking part (212) of the armature (21) is U-shaped, the unlocking part (212) comprises a reaction rod (2121) and an unlocking rod (2122) which are respectively arranged at two sides of the connecting mechanism, one end of the reaction rod (2121) and one end of the unlocking rod (2122) are respectively connected with one side of the pivoting rod (211) to form the pivoting rod (211), the other end of the reaction rod (2121) is connected with the magnet yoke (23) through a reaction spring (22), the other end of the unlocking rod (2122) is matched with the operating mechanism (12), and a space for avoiding the connecting mechanism and the bimetallic strip (24) is formed between the reaction rod (2121) and the unlocking rod (2122).

8. The trip protection mechanism of claim 7, wherein: the unlocking rod (2122) is U-shaped and is convexly folded towards one side of the connecting mechanism, the unlocking rod (2122) comprises a first unlocking arm (2141) and a third unlocking arm (2143) which are oppositely arranged, and a second unlocking arm (2142) connected between the first unlocking arm (2141) and one end of the third unlocking arm (2143), the second unlocking arm (2142) is positioned at one side of the connecting mechanism, the other end of the first unlocking arm (2141) is connected with the pivoting rod (211), and the other end of the third unlocking arm (2143) is matched with the operating mechanism (12); the coupling piece (26) is L-shaped, the coupling piece (26) comprises a first coupling plate (261) and a second coupling plate (262) which are connected, the other end of the first coupling plate (261) is connected with the thermal element (25), and the other end of the second coupling plate (262) is connected with the wiring terminal; the heating element (25) is L-shaped, the heating element (25) comprises a first heating plate (251) and a second heating plate (252) which are connected, the other end of the first heating plate (251) is connected with the connecting piece (26), and the other end of the second heating plate (252) is connected with the contact mechanism.

9. A circuit breaker comprising a housing (11), a contact mechanism disposed in the housing (11), an operating mechanism (12), a transmission mechanism (15), and a trip protection mechanism according to any of claims 1-8, wherein: the contact mechanism comprises a movable contact (14) and a fixed contact which are respectively arranged on two sides of an operating mechanism (12), the movable contact (14) and the fixed contact are respectively connected into a circuit through a plurality of wiring terminals (13), the fixed contact is connected with the wiring terminal (13) at one end of a shell (11) through a tripping protection mechanism, a transmission mechanism (15) is correspondingly arranged above the fixed contact and is positioned between the operating mechanism (12) and the tripping protection mechanism, the movable contact (14) is connected with the wiring terminal (13) at the other end of the shell (11), the operating mechanism (12) can drive the movable contact (14) to be contacted with the fixed contact, and the tripping protection mechanism can unlock the operating mechanism (12) through the transmission mechanism (15) and drive the movable contact (14) to leave.

10. The circuit breaker of claim 9, wherein: the circuit breaker comprises three contact units, each contact unit comprises a contact mechanism and a tripping protection mechanism respectively connected with the contact mechanism, a moving contact (14) of each contact mechanism is respectively connected with an operating mechanism (12), the three tripping protection mechanisms are respectively matched with a transmission mechanism (15), a partition plate (17) extending to the side face of a pivoting side plate (233) is correspondingly arranged between the contact units of a shell (11), and horizontal limiting protrusions (16) in limiting fit with isolating sleeves (235) are arranged on the two sides of the side wall of the partition plate (17) and the inner side of the side wall of the shell (11).

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