CN219800773U - Tripping structure and circuit breaker - Google Patents

Abstract

The utility model discloses a tripping structure and a circuit breaker, wherein the tripping structure is applied to the circuit breaker and is used for driving the circuit breaker to trip, the tripping structure comprises a traction piece and a tripping assembly, the tripping assembly comprises an electromagnet, a permanent magnet, a spring and an action rod, and the electromagnet comprises a magnetic core and a coil; the tripping structure is simple in structure, and the action rod drives the traction piece to move, so that the circuit breaking function of the circuit breaker is realized; on one hand, the coil is arranged to be repelled to a second position by the permanent magnet under the conductive state, and then the magnetic core drives the action rod to move, so that the actuation of the traction piece is realized; on the other hand, through setting up the spring, the elasticity of spring can drive the magnetic core and move to the second position from the first position, can play auxiliary actuation's effect, is favorable to improving the actuation strength to the traction member to improve the braking performance of tripping structure.

Description

Tripping structure and circuit breaker

Technical Field

The utility model relates to the technical field of electrical control, in particular to a tripping structure and a circuit breaker.

Background

Circuit breakers are components commonly used in the electrical arts, mainly for switching on and off current and for providing protection to lines and equipment in the event of over-current or short-circuits. Current circuit breakers typically have a trip mechanism for releasing the hold mechanism and automatically opening the circuit breaker.

In the current circuit breaker, the tripping structure can drive the traction rod to rotate so as to realize the circuit breaking function of the circuit breaker. Current trip mechanisms are mostly tripped by manual or magnetic tripping. However, the current magnetic tripping structure is complex in structure and poor in braking performance.

Disclosure of Invention

The utility model aims to provide a tripping structure and a circuit breaker so as to solve the problems that the current tripping structure is complex in structure and poor in braking performance.

The utility model adopts the following scheme for solving the technical problems.

In a first aspect, the present utility model provides a trip structure, applied to a circuit breaker, for driving the circuit breaker to trip, including:

the traction piece is matched with the operating mechanism and driven by the shedding assembly to rotate so as to trip the operating mechanism;

a trip assembly, comprising:

a permanent magnet;

an electromagnet comprising a magnetic core and a coil, the magnetic core configured to be attracted to a first position by the permanent magnet when the coil is in a non-conductive state and to be repelled from a second position by the permanent magnet when the coil is in a conductive state;

the action rod is arranged at one end of the magnetic core, which is close to the permanent magnet, and extends along one end, which is away from the magnetic core, and penetrates through the permanent magnet to the traction piece position; the action bars are configured to follow the magnetic core and drive the traction piece to move when the magnetic core moves from the first position to the second position;

the spring is sleeved at one end of the electromagnet, which is away from the permanent magnet, and is configured to be in a compressed state when the electromagnet is in the first position and provide a forward driving force for the electromagnet when the electromagnet moves to the second position; the elastic force of the spring in a compressed state is smaller than the adsorption force of the permanent magnet to the electromagnet.

In some embodiments of the present utility model, the trip assembly further includes a first housing, wherein the electromagnet and the permanent magnet are both housed within the first housing, and the magnetic core has a first end extending out of the first housing along a first direction, the first direction being a direction in which the magnetic core faces away from the permanent magnet; the first end is provided with a sleeve, and the spring is pressed between the sleeve and the first shell.

In some embodiments of the present utility model, the first housing includes a fixing plate, a first through hole is provided on the fixing plate, the magnetic core includes a first sub-portion accommodated in the first housing and a second sub-portion extending out of the first housing along the first through hole, and the coil is wound outside the first sub-portion;

the radial dimension of the first sub-part is larger than the radial dimension of the first through hole and the radial dimension of the second sub-part.

In some embodiments of the present utility model, the trip structure further includes a transmission assembly, where the transmission assembly includes a sliding column and a sliding block, and a pressing portion is disposed on the sliding block, and the pressing portion is disposed at an end of the sleeve facing away from the spring;

the slider is configured to be slidable along the slide column, and the pressing portion presses the sleeve to drive the magnetic core to move from the second position to the first position.

In some embodiments of the present utility model, the transmission assembly includes a fixed frame on which the sliding post is fixed; wherein, the mount still with first casing is fixed.

In some embodiments of the present utility model, the trip structure further includes a drive assembly including a rotation shaft and a drive shaft, the drive shaft following the rotation shaft and rotating about the rotation shaft; the sliding block is provided with a second through hole, the second through hole is provided with an inner wall, the driving shaft penetrates through the second through hole, and the driving shaft can slide along at least part of the inner wall so as to drive the sliding block to slide along the sliding column.

In some embodiments of the present utility model, the rotation shaft is inserted through the second through hole to fix a sliding direction of the sliding block.

In some embodiments of the present utility model, the driving assembly further includes a driving gear, a driven gear, and a motor, where the driving gear drives the driven gear to rotate under the driving of the motor; the rotary shaft and the driven gear are coaxially arranged in a transmission way, a rotary disc is fixed on the rotary shaft, and the driving shaft is arranged on the rotary disc and rotates around the rotary shaft along with the rotary disc.

In some embodiments of the present utility model, the traction member is provided with a first slot, and the action bar has a second end passing through the first slot; the second end is provided with an end cap, and the radial dimension of the end cap is larger than that of the first slotted hole.

In a second aspect, the utility model further provides a circuit breaker, which comprises the tripping structure.

The utility model provides a tripping structure and a circuit breaker, wherein the tripping structure is applied to the circuit breaker and is used for separating a movable contact piece and a static contact piece in the circuit breaker, the tripping structure comprises a traction piece and a tripping assembly, the tripping assembly comprises an electromagnet, a permanent magnet, a spring and an action rod, and the electromagnet comprises a magnetic core and a coil; the tripping structure is simple in structure, and the action rod drives the traction piece to move, so that the operating mechanism trips, and the circuit breaking function of the circuit breaker is realized; on one hand, the coil is arranged to be repelled to a second position by the permanent magnet under the conductive state, and then the magnetic core drives the action rod to move, so that the actuation of the traction piece is realized; on the other hand, through setting up the spring, the elasticity of spring can drive the magnetic core and move to the second position from the first position, can play auxiliary actuation's effect, is favorable to improving the actuation strength to the traction member to improve the braking performance of tripping structure.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a circuit breaker according to an embodiment of the present utility model;

fig. 2 is an exploded view of a partial structure of a circuit breaker according to an embodiment of the present utility model;

fig. 3 is a schematic structural diagram of a trip structure according to an embodiment of the present utility model;

FIG. 4 is a schematic cross-sectional view of a trip structure according to an embodiment of the present utility model;

FIG. 5 is a second cross-sectional view of a trip structure according to one embodiment of the present utility model;

FIG. 6 is an enlarged view of part B of FIG. 4 in accordance with the present utility model;

FIG. 7 is an enlarged view of part A of FIG. 4 in accordance with the present utility model;

fig. 8 is a schematic structural diagram of a trip structure according to another embodiment of the present utility model;

fig. 9 is a third schematic cross-sectional view of a trip structure according to another embodiment of the present utility model;

fig. 10 is a fourth schematic cross-sectional view of a trip structure according to another embodiment of the present utility model;

fig. 11 is a schematic structural diagram of a trip structure according to another embodiment of the present utility model;

fig. 12 is an enlarged view of part C of fig. 1 in accordance with the present utility model.

Description of main reference numerals:

100-traction piece, 110-first slot, 200-trip component, 210-electromagnet, 211-sleeve, 212-first end, 213-first sub, 214-second sub, 215-coil, 220-spring, 230-action bar, 231-second end, 232-end cap, 240-first housing, 241-fixed plate, 242-first through hole, 250-permanent magnet, 300-transmission component, 310-fixing frame, 320-sliding block, 321-second through hole, 322-pressing part, 330-sliding column, 400-driving component, 410-rotation axis, 411-rotation disk, 420-driving shaft, 430-driven gear, 440-driving gear, 500-circuit breaker, a-first direction.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model. In the description of the present utility model, the meaning of "a plurality" is two or more unless explicitly defined otherwise.

In the application, the term "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described as "exemplary" in this disclosure is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the utility model. In the following description, details are set forth for purposes of explanation. It will be understood by those of ordinary skill in the art that the present utility model may be practiced without these specific details. In other instances, well-known structures and processes have not been shown in detail to avoid unnecessarily obscuring the description of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles disclosed herein.

Current circuit breakers are increasingly miniaturized, and tripping structures in the circuit breakers also need to be optimized to meet the development requirements of the circuit breakers.

Based on this, the present utility model proposes a trip structure and a circuit breaker capable of solving the above-mentioned problems.

Referring to fig. 1 and 2, fig. 1 is a schematic diagram showing a structure of a circuit breaker 500 according to the present embodiment, and fig. 2 is an exploded view showing a part of the structure of the circuit breaker 500 according to the present embodiment. The circuit breaker 500 in this embodiment includes a trip structure including a traction member 100 and a trip assembly 200. The retractor is used to drive the circuit breaker to trip and the trip assembly 200 is used to actuate the retractor 100. The trip control of the circuit breaker 500 may be achieved by controlling the trip assembly 200.

The traction member 100 is used for cooperating with an operating mechanism, and is driven by the tripping assembly 200 to rotate to trip the operating mechanism. Referring to fig. 3, fig. 3 is a schematic structural diagram of a trip structure provided in the present embodiment; trip assembly 200 includes an electromagnet 210, a permanent magnet 250, a spring 220, and an action bar 230. It should be noted that the electromagnet 210 generally has an electrically conductive state in which the electromagnet 210 has a magnetic force and a non-conductive state in which the electromagnet 210 does not have a magnetic force. The permanent magnet 250 is typically a ferromagnetic body capable of generating a magnetic field force that attracts other magnetic objects.

Further, referring to fig. 4 and 5, fig. 4 shows a first schematic cross-sectional view of the trip structure (with the corresponding core in a first position); fig. 5 shows a second cross-sectional schematic view of the trip structure (with the corresponding core in a second position). The electromagnet 210 includes a magnetic core and a coil 215, and the conductive state of the electromagnet 210 corresponds to the coil 215 being in a conductive state, and the nonconductive state of the electromagnet 210 corresponds to the coil 215 being in a nonconductive state. That is, the magnetic core is capable of forming a magnetic field force when the coil 215 is energized, and does not have a magnetic field force when the coil 215 is de-energized. The core is configured such that when the coil 215 is in a non-conductive state, the core is attracted to a first position by the permanent magnet 250 and when the coil 215 is in a conductive state, the core is repelled from a second position by the permanent magnet 250. It will be appreciated that when the circuit breaker 500 is operating normally, the circuit is normally on and no current is present on the coil 215, so the core can be attracted to the permanent magnet 250. When the circuit breaker 500 is over-current, short-circuited, or leaked, a circuit breaker controller (not shown) sends a switching-off signal, a current is formed on the coil 215, and the magnetic core generates a magnetic field force that repels the permanent magnet 250, driving the magnetic core away from the permanent magnet 250.

Referring to fig. 6, fig. 6 shows an enlarged view of part B of fig. 4. The action bars 230 are disposed at the end of the core adjacent to the permanent magnets 250, and the action bars 230 extend along the end facing away from the core and through the permanent magnets 250 to the location of the retractor 100. That is, the action bars 230 are disposed on the magnetic core and can follow the magnetic core movement, and the action bars 230 can extend to the position of the traction member 100. The action bars 230 are configured such that when the magnetic core moves from the first position to the second position, the action bars 230 follow the magnetic core and move the retractor 100. Specifically, when the circuit breaker 500 is required to be opened, a current is generated in the coil 215, a repulsive force is generated between the magnetic core and the permanent magnet 250, the magnetic core is far away from the permanent magnet 250 under the action of the repulsive force, and the driving action rod 230 drives the traction piece 100 to move so as to drive the circuit breaker to release.

In some embodiments, a threaded bore is provided in the core that is threadably engaged with the action bars 230.

The spring 220 is sleeved on the end of the electromagnet 210 facing away from the permanent magnet 250, and the spring 220 is configured to be in a compressed state when the electromagnet 210 is in the first position, and provide a forward driving force for the electromagnet 210 when moving to the second position.

It will be appreciated that when the spring 220 is in a compressed state, an elastic force is applied to the magnetic core, and the magnetic core is driven to move to the second position under the action of the elastic force. Wherein, the elastic force of the spring 220 in the compressed state is smaller than the adsorption force of the permanent magnet 250 to the magnetic core. It is possible to ensure stable adsorption of the core on the permanent magnet 250 in the non-conductive state.

The tripping structure is simple in structure, and the action rod 230 drives the traction piece 100 to move so as to drive the operating mechanism to trip, so that the breaking function of the breaker 500 is realized; on the one hand, the magnetic core is repelled to the second position by the permanent magnet 250 under the conductive state of the coil 215, and then the magnetic core drives the action rod 230 to move, so that the traction piece 100 is actuated; on the other hand, by providing the spring 220, the magnetic core can be driven to move from the first position to the second position by the elastic force of the spring 220, which can play a role of auxiliary actuation, so as to be beneficial to improving the actuating strength of the traction member and improving the braking performance of the tripping structure in some embodiments of the utility model, please refer to fig. 7, fig. 7 shows a partial a enlarged view of fig. 4. The trip assembly 200 in this embodiment further includes a first housing 240, at least a portion of the electromagnet 210 and the permanent magnet 250 are housed within the first housing 240, and the magnetic core has a first end 212 extending out of the first housing 240 along a first direction a, which is a direction of the magnetic core away from the permanent magnet 250. The first end 212 is provided with a sleeve 211, and the spring 220 is pressed between the sleeve 211 and the first housing 240. That is, the interval between the sleeve 211 and the first housing 240 is continuously changed to compress the spring 220.

In some embodiments, the spring 220 may be sleeved outside the first housing 240, may be sleeved outside the sleeve 211, and may be disposed between the first housing 240 and the sleeve 211, where the spring 220 is connected to the first housing 240 and the sleeve 211, respectively.

In some embodiments of the present utility model, please continue to refer to fig. 7, the first housing 240 in this embodiment includes a fixing plate 241, a first through hole 242 is provided on the fixing plate 241, the magnetic core includes a first sub-portion 213 accommodated in the first housing 240 and a second sub-portion 214 extending out of the first housing 240 along the first through hole 242, and the coil 215 is wound around the first sub-portion 213; wherein, the radial dimension of the first sub-portion 213 is greater than the radial dimension of the first through hole 242 and the second sub-portion 214. In some embodiments, spring 220 acts on sleeve 211 at one end and on fixed plate 241 at one end.

In some embodiments, the sleeve 211 is centrally provided with a third through hole into which the electromagnet 210 may extend and be secured by a washer. The electromagnet 210 includes a third sub-portion that protrudes into the third through-hole. The radial dimension of the third sub-portion is intermediate the radial dimensions of the first sub-portion 213 and the second sub-portion 214. For example, if the first sub-portion 213, the second sub-portion 214, and the third sub-portion are each in a columnar structure, the diameter of the first sub-portion 213 is larger than that of the third sub-portion and larger than that of the second sub-portion 214.

In some embodiments of the present utility model, please refer to fig. 8, 9 and 10, in which fig. 8 shows a schematic structural diagram of the trip structure in the present embodiment, fig. 9 shows a third schematic sectional view of the trip structure in the present embodiment, and fig. 10 shows a fourth schematic sectional view of the trip structure in the present embodiment. The trip structure in this embodiment further includes a transmission assembly 300, where the transmission assembly 300 includes a sliding column 330 and a sliding block 320, and the sliding block 320 is provided with a pressing portion 322, and the pressing portion 322 is disposed at an end of the sleeve 211 facing away from the spring 220. That is, the pressing part 322 is moved by sliding on the sliding column 330 by the sliding block 320.

The slider 320 is configured to be slidable along the slide post 330, and the pressing portion 322 presses the sleeve 211 to drive the magnetic core to move from the second position to the first position. The sleeve 211 is pressed by the pressing portion 322 to move the core along one end near the permanent magnet 250. The magnetic core is driven to move from the second position to the first position, so that the reset of the tripping structure is realized.

In some embodiments of the present utility model, please continue to refer to fig. 8, the transmission assembly 300 in this embodiment includes a fixing frame 310, and a sliding post 330 fixed on the fixing frame 310; wherein, the fixing frame 310 is further fixed with the first housing 240. In some embodiments, the fixing frame 310 and the first housing 240 are fixed by bolts.

In some embodiments of the present utility model, referring to fig. 11, fig. 11 is a schematic diagram illustrating a trip structure provided in the present embodiment; the trip structure in this embodiment further includes a driving assembly 400, the driving assembly 400 including a rotation shaft 410 and a driving shaft 420, the driving shaft 420 following the rotation shaft 410 and rotating around the rotation shaft 410. The sliding block 320 is provided with a second through hole 321, the second through hole 321 has an inner wall, the driving shaft 420 is disposed in the second through hole 321 in a penetrating manner, and the driving shaft 420 can slide along at least a part of the inner wall so as to drive the sliding block 320 to slide along the sliding post 330. The automatic reset of the trip mechanism is facilitated by the drive assembly 400.

In some embodiments of the present utility model, referring to FIG. 12, FIG. 12 shows an enlarged view of part C of FIG. 1; the rotation shaft 410 in this embodiment is inserted through the second through hole 321 to fix the sliding direction of the sliding block 320, which is beneficial to improving the stability of transmission.

In some embodiments of the present utility model, referring to fig. 11, the driving assembly 400 further includes a driving gear 440, a driven gear 430, and a motor, wherein the driving gear 440 drives the driven gear 430 to rotate under the driving of the motor. The rotation shaft 410 and the driven gear 430 are coaxially driven, the rotation shaft 410 is fixed with the rotation disc 411, and the driving shaft 420 is arranged on the rotation disc 411 and rotates around the rotation shaft 410 following the rotation disc 411.

In some embodiments, the drive gear 440 is driven to rotate by a dc motor, a reduction gearbox.

In some embodiments of the present utility model, referring to fig. 3 and 6, the traction member 100 is provided with a first slot 110, and the action bar 230 has a second end 231 passing through the first slot 110; the second end 231 is provided with an end cap 232, and the radial dimension of the end cap 232 is larger than the radial dimension of the first slot 110. Since the size of the end cap 232 is larger than the size of the first slot 110, the end cap 232 is clamped at the position of the first slot 110 during the process of moving the magnetic core from the first position to the second position, and thus the traction member 100 is driven to move, so as to realize the breaking function of the breaker 500.

The action flow of the tripping structure is as follows: when the circuit is normal, the coil 215 does not form an electromagnetic field, the permanent magnet 250 tightly adsorbs the magnetic core and simultaneously compresses the spring 220; at this time, the end cap 232 of the action bar 230 passes through the first slot 110 and may not be attached to the traction member 100. When the circuit is over-current, short-circuit and electric leakage, the circuit breaker controller (not shown in the figure) sends out a brake-separating signal, the coil 215 forms an electromagnetic field, the magnetic core and the permanent magnet 250 repel each other, and under the action of repulsive force and elastic force of the spring 220, the magnetic core is far away from the permanent magnet 250 and drives the action rod 230 and the end cap 232 to move, so that the traction piece 100 is driven to rotate, and the quick brake of the circuit breaker 500 is realized.

In the foregoing embodiments, the descriptions of the embodiments are focused on, and the portions of one embodiment that are not described in detail in the foregoing embodiments may be referred to in the foregoing detailed description of other embodiments, which are not described herein again.

While the basic concepts have been described above, it will be apparent to those skilled in the art that the foregoing detailed disclosure is by way of example only and is not intended to be limiting. Although not explicitly described herein, various modifications, improvements and adaptations of the utility model may occur to one skilled in the art. Such modifications, improvements, and modifications are intended to be suggested within the present disclosure, and therefore, such modifications, improvements, and adaptations are intended to be within the spirit and scope of the exemplary embodiments of the present disclosure.

Meanwhile, the present utility model uses specific words to describe embodiments of the present utility model. Reference to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic is associated with at least one embodiment of the utility model. Thus, it should be emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various positions in this specification are not necessarily referring to the same embodiment. Furthermore, certain features, structures, or characteristics of one or more embodiments of the utility model may be combined as suitable.

Similarly, it should be noted that in order to simplify the description of the present disclosure and thereby aid in understanding one or more inventive embodiments, various features are sometimes grouped together in a single embodiment, figure, or description thereof. This method of disclosure, however, is not intended to imply that more features than are required by the subject utility model. Indeed, less than all of the features of a single embodiment disclosed above.

Accordingly, in some embodiments, numerical parameters set forth in the specification and claims are approximations that may vary depending upon the desired properties sought to be obtained by the individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and employ a method for preserving the general number of digits. Although the numerical ranges and parameters set forth herein are approximations in some embodiments for use in determining the breadth of the range, in particular embodiments, the numerical values set forth herein are as precisely as possible.

Each patent, patent application publication, and other material, such as articles, books, specifications, publications, documents, etc., cited herein is hereby incorporated by reference in its entirety except for any application history file that is inconsistent or otherwise conflict with the present disclosure, which places the broadest scope of the claims in this application (whether presently or after it is attached to this application). It is noted that the description, definition, and/or use of the term in the appended claims controls the description, definition, and/or use of the term in this utility model if the description, definition, and/or use of the term in the appended claims does not conform to or conflict with the present disclosure.

The foregoing has outlined the detailed description of the embodiments of the present utility model, and the detailed description of the principles and embodiments of the present utility model is provided herein by way of example only to facilitate the understanding of the method and core concepts of the present utility model; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present utility model, the present description should not be construed as limiting the present utility model.

Claims (10)

1. A trip structure, applied in a circuit breaker, for driving the circuit breaker to trip, comprising:

the traction piece is matched with the operating mechanism and driven by the tripping assembly to rotate so as to trip the operating mechanism;

a trip assembly, comprising:

a permanent magnet;

an electromagnet comprising a magnetic core and a coil, the magnetic core configured to be attracted to a first position by the permanent magnet when the coil is in a non-conductive state and to be repelled from a second position by the permanent magnet when the coil is in a conductive state;

the action rod is arranged at one end of the magnetic core, which is close to the permanent magnet, and extends along one end, which is away from the magnetic core, and penetrates through the permanent magnet to the traction piece position; the action bars are configured to follow the magnetic core and drive the traction piece to move when the magnetic core moves from the first position to the second position;

the spring is sleeved at one end of the electromagnet, which is away from the permanent magnet, and is configured to be in a compressed state when the electromagnet is in the first position and provide a forward driving force for the electromagnet when the electromagnet moves to the second position; the elastic force of the spring in a compressed state is smaller than the adsorption force of the permanent magnet to the electromagnet.

2. The trip structure of claim 1, wherein the trip assembly further comprises a first housing, wherein the electromagnet and the permanent magnet are both housed within the first housing, wherein the magnetic core has a first end extending out of the first housing along a first direction, wherein the first direction is a direction in which the magnetic core faces away from the permanent magnet; the first end is provided with a sleeve, and the spring is pressed between the sleeve and the first shell.

3. The trip structure of claim 2, wherein the first housing includes a fixed plate provided with a first through hole, the magnetic core includes a first sub-portion accommodated in the first housing and a second sub-portion extending out of the first housing along the first through hole, and the coil is wound outside the first sub-portion;

the radial dimension of the first sub-part is larger than the radial dimension of the first through hole and the radial dimension of the second sub-part.

4. The trip structure of claim 2, further comprising a transmission assembly comprising a sliding column and a sliding block, wherein a pressing portion is provided on the sliding block, and the pressing portion is provided at an end of the sleeve facing away from the spring;

the slider is configured to be slidable along the slide column, and the pressing portion presses the sleeve to drive the magnetic core to move from the second position to the first position.

5. The trip mechanism of claim 4, wherein said drive assembly includes a mount, said sliding post being secured to said mount; wherein, the mount still with first casing is fixed.

6. The trip structure of claim 4, further comprising a drive assembly including a rotational shaft and a drive shaft, said drive shaft following and rotating about said rotational shaft; the sliding block is provided with a second through hole, the second through hole is provided with an inner wall, the driving shaft penetrates through the second through hole, and the driving shaft can slide along at least part of the inner wall so as to drive the sliding block to slide along the sliding column.

7. The trip structure according to claim 6, wherein the rotation shaft is penetrated through the second through hole to fix a sliding direction of the sliding block.

8. The trip mechanism of claim 6, wherein the drive assembly further comprises a drive gear, a driven gear, and a motor, the drive gear being driven by the motor to rotate the driven gear; the rotary shaft and the driven gear are coaxially arranged in a transmission way, a rotary disc is fixed on the rotary shaft, and the driving shaft is arranged on the rotary disc and rotates around the rotary shaft along with the rotary disc.

9. The trip mechanism of claim 1, wherein said traction member defines a first slot, said action bar having a second end passing through said first slot; the second end is provided with an end cap, and the radial dimension of the end cap is larger than that of the first slotted hole.

10. A circuit breaker comprising a trip structure according to any one of claims 1 to 9.