Bidirectional magnetic latching mechanism and circuit breaker

Abstract

The utility model provides a bidirectional magnetic holding mechanism and a circuit breaker, and relates to the technical field of low-voltage electrical appliances, the bidirectional magnetic holding mechanism comprises a magnetic assembly and a transmission shaft penetrating through the magnetic assembly, the transmission shaft is sleeved with a movable iron core, a closing static iron core and an opening static iron core, the movable iron core is located between the closing static iron core and the opening static iron core, and the movable iron core can drive the transmission shaft to move; the magnetic assembly generates a closed magnetic loop, so that when the movable iron core approaches the closing static iron core, the movable iron core and the closing static iron core are kept in an attraction state; and when the movable iron core is close to the opening static iron core, the movable iron core and the opening static iron core are in clearance attraction. When the movable iron core and the opening static iron core are in clearance attraction, namely, the opening holding force is reduced, so that the operating force required by closing is correspondingly reduced, the impact force generated when a system is closed is reduced, the problem that in the prior art, a device is unstable due to the fact that the closing operating force and the impact force are too large is solved, and the closing comfort is effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of low-voltage electrical appliances, and in particular to a bidirectional magnetic latching mechanism and a circuit breaker. Background Art

[0002] Circuit breakers can be used to distribute electrical energy. When electrical components are seriously overloaded or have faults such as short circuits and undervoltage, they can automatically cut off the circuit. A magnetic system is set up inside the circuit breaker. Through the cooperation of the static iron core and the moving iron core of the magnetic system, the moving iron core moves to drive the contact system to open and close. At present, the operating force when closing the circuit breaker is too large, which will cause excessive impact on the internal components of the circuit breaker and the external components that cooperate with the circuit breaker, affecting the performance and stability of these components. Utility Model Content

[0003] The purpose of the present application is to provide a bidirectional magnetic holding mechanism and a circuit breaker to address the deficiencies in the above-mentioned prior art, so as to solve the problem of excessive operating force and impact force when closing the circuit breaker.

[0004] To achieve the above purpose, the technical solution adopted in the embodiment of the present application is as follows:

[0005] In one aspect of an embodiment of the present application, a bidirectional magnetic holding mechanism is provided, comprising a magnetic assembly and a transmission shaft passing through the magnetic assembly, wherein a moving iron core, a closing static iron core and an opening static iron core are sleeved on the transmission shaft, the moving iron core is located between the closing static iron core and the opening static iron core, and the moving iron core can drive the transmission shaft to move;

[0006] The magnetic assembly generates a closed magnetic circuit so that when the moving iron core approaches the closing static iron core, the moving iron core and the closing static iron core remain in an attracted state; when the moving iron core approaches the opening static iron core, the moving iron core and the opening static iron core remain gap attracted.

[0007] Optionally, an air gap is formed between the moving iron core and the opening static iron core, and the air gap is realized by any one of the following:

[0008] A limiting boss is formed on the transmission shaft, and when the moving iron core moves toward the opening static iron core, the closing static iron core abuts against the limiting boss, so that the air gap is formed between the moving iron core and the opening static iron core;

[0009] Alternatively, a non-magnetic gasket is sleeved on the transmission shaft, and the gasket is located between the moving iron core and the opening static iron core;

[0010] Alternatively, a compression spring is sleeved on the transmission shaft, the compression spring is located between the transmission shaft and the moving iron core, and one end of the compression spring abuts against the opening static iron core.

[0011] Optionally, the moving iron core and the opening static iron core are matched with each other, and the matching manner includes at least any one of the following:

[0012] A plurality of protrusions are formed on the end surface of the moving iron core facing the opening static iron core, and the moving iron core is in contact with the opening static iron core through the protrusions;

[0013] The contact surfaces of the moving iron core and the opening static iron core are matched through stepped surface matching or conical surface matching.

[0014] Optionally, along the axial direction of the transmission shaft, the thickness of the opening static iron core is smaller than the thickness of the closing static iron core.

[0015] Optionally, the magnetic assembly includes a yoke, and a frame and a coil arranged inside the yoke, the coil is sleeved outside the frame, and also includes two magnetic steels with opposite polarities arranged relatively outside the moving iron core, the magnetic steels are located inside the frame;

[0016] When a positive constant current is passed through the coil, the moving iron core is driven to drive the transmission shaft to move toward the closing static iron core; when a reverse constant current is passed through the coil, the moving iron core drives the transmission shaft to move toward the opening static iron core; the magnetic lines of force generated by the coil being energized wrap around the magnet and the yoke to form the closed magnetic circuit.

[0017] Optionally, the coil includes a first coil and a second coil, the first coil corresponds to the closing static iron core, and the second coil corresponds to the opening static iron core;

[0018] The first coil and the second coil have the same number of turns, and along the axial direction of the transmission shaft, the thickness of the first coil and the thickness of the second coil are the same.

[0019] Optionally, the material of the magnetic steel is a permanent magnetic material, the magnetic steel is a U-shaped structure, and the opening of the U-shape faces the transmission shaft.

[0020] According to another aspect of an embodiment of the present application, a circuit breaker is provided, comprising a button mechanism, an operating mechanism, and the above-mentioned bidirectional magnetic holding mechanism respectively connected to the button mechanism and the operating mechanism.

[0021] Optionally, a connecting groove is provided at one end of the transmission shaft for connecting with the button mechanism, and a connecting hole is provided at the other end of the transmission shaft for connecting with the operating mechanism.

[0022] The beneficial effects of this application include:

[0023] The present application provides a bidirectional magnetic holding mechanism and a circuit breaker, including a magnetic assembly and a transmission shaft passing through the magnetic assembly, wherein a moving iron core, a closing static iron core and an opening static iron core are sleeved on the transmission shaft, and the moving iron core is located between the closing static iron core and the opening static iron core, and the moving iron core can drive the transmission shaft to move; the magnetic assembly generates a closed magnetic circuit, so that when the moving iron core is close to the closing static iron core, the moving iron core and the closing static iron core remain in an attracted state; when the moving iron core is close to the opening static iron core, the moving iron core and the opening static iron core maintain a gap and are attracted. When the moving iron core and the opening static iron core maintain a gap and are attracted, that is, the opening holding force is reduced, so that the operating force required for closing is also reduced accordingly, and the impact force generated when the system is closed is reduced, which solves the problem of device instability caused by excessive closing operating force and impact force in the prior art, and effectively improves the comfort of closing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 This is one of the schematic diagrams of the open state of the bidirectional magnetic latching mechanism provided in the embodiment of the present application;

[0026] Figure 2 The second schematic diagram of the open state of the bidirectional magnetic latching mechanism provided in the embodiment of the present application;

[0027] Figure 3 for Figure 2 Middle AA section view;

[0028] Figure 4 One of the exploded diagrams of the bidirectional magnetic latching mechanism in the open state provided in the embodiment of the present application;

[0029] Figure 5 The second exploded diagram of the bidirectional magnetic latching mechanism in the open state provided in the embodiment of the present application;

[0030] Figure 6 One of the partial diagrams of the open state of the bidirectional magnetic latching mechanism provided in the embodiment of the present application;

[0031] Figure 7 The second partial diagram of the bidirectional magnetic latching mechanism in the open state provided in the embodiment of the present application;

[0032] Figure 8 The third partial diagram of the open state of the bidirectional magnetic latching mechanism provided in the embodiment of the present application;

[0033] Fig. 9One of the schematic diagrams of the closed state of the bidirectional magnetic latching mechanism provided in the embodiment of the present application;

[0034] Fig.10 The second schematic diagram of the closed state of the bidirectional magnetic latching mechanism provided in the embodiment of the present application;

[0035] Fig.11 for Fig.10 Middle BB section;

[0036] Fig.12 One of the partial diagrams of the closed state of the bidirectional magnetic latching mechanism provided in the embodiment of the present application;

[0037] Fig.13 The second partial diagram of the closed state of the bidirectional magnetic latching mechanism provided in the embodiment of the present application;

[0038] Fig.14 The third partial diagram of the closed state of the bidirectional magnetic latching mechanism provided in the embodiment of the present application;

[0039] Fig.15 This is the fourth partial diagram of the closed state of the bidirectional magnetic holding mechanism provided in an embodiment of the present application.

[0040] Icons: 10-bidirectional magnetic holding mechanism; 11-transmission shaft; 11a-connecting hole; 11b-connecting groove; 110-limiting boss; 111-tooth groove; 12-moving iron core; 120-protrusion; 131-closing static iron core; 132-opening static iron core; 14-magnetic steel; 151-first coil; 152-second coil; 16-yoke; 161-first yoke; 162-second yoke; 17-skeleton; 171-groove; 18-compression spring; 19-gasket. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. It should be noted that, in the absence of conflict, the various features in the embodiments of the present application can be combined with each other, and the combined embodiments are still within the scope of protection of the present application.

[0043] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0044] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0045] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0046] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] In one aspect of the embodiment of the present application, referring to Figure 1 , Figure 2 , a bidirectional magnetic latching mechanism 10 is provided, comprising a magnetic assembly and a transmission shaft 11 passing through the magnetic assembly, a moving iron core 12, a closing static iron core 131 and an opening static iron core 132 are sleeved on the transmission shaft 11, the moving iron core 12 is located between the closing static iron core 131 and the opening static iron core 132, and the moving iron core 12 can drive the transmission shaft 11 to move;

[0048] The magnetic assembly generates a closed magnetic circuit so that when the moving iron core 12 approaches the closing static iron core 131, the moving iron core 12 and the closing static iron core 131 remain in an attracted state; when the moving iron core 12 approaches the opening static iron core 132, the moving iron core 12 and the opening static iron core 132 remain gap attracted.

[0049] The magnetic assembly is used to provide a driving force for driving the moving iron core 12 to move, and to keep the moving iron core 12 and the stationary iron core in a closed magnetic loop that is attracted.

[0050] Generally, if Figure 4 , Figure 5 As shown, the magnetic assembly includes a yoke 16 , a frame 17 and a coil arranged inside the yoke 16 , the coil is sleeved outside the frame 17 , and also includes two magnets 14 with opposite polarities arranged relatively outside the moving iron core 12 , and the magnets 14 are located inside the frame 17 .

[0051] The yoke 16 includes a first yoke 161 and a second yoke 162 . For example, the first yoke 161 is a flat plate structure, and the second yoke 162 is a U-shaped structure. The first yoke 161 is buckled on the second yoke 162 to form a semi-enclosed space.

[0052] The skeleton 17 forms a “W”-shaped structure, and the coil includes a first coil 151 and a second coil 152 , which are respectively sleeved outside the skeleton 17 ; the overall structure formed by the skeleton 17 and the coil is located in a semi-enclosed space of the yoke 16 .

[0053] The first coil 151 and the second coil 152 wound around the outside of the skeleton 17 are usually wire diameter coils. For symmetrical arrangement, the first coil 151 and the second coil 152 have the same number of turns. Along the axial direction of the transmission shaft 11, the thickness of the first coil 151 and the second coil 152 are the same.

[0054] In addition, two opposite grooves 171 are provided in the skeleton 17 , each groove 171 contains a magnet 14 , and the two magnets 14 are arranged in the grooves 171 of the skeleton 17 with opposite polarities. The two magnets 14 are oppositely arranged between the first coil 151 and the second coil 152 .

[0055] For example, the magnetic steel 14 is a U-shaped structure, and the groove 171 in the skeleton 17 is a U-shaped groove 171 to match the magnetic steel 14; the material of the magnetic steel 14 is a permanent magnetic material, and different grades of materials can be selected according to different force requirements.

[0056] The transmission shaft 11 passes through the frame 17 to penetrate the magnetic assembly. The moving iron core 12 is fixedly mounted on the transmission shaft 11, and the moving iron core 12 is located between two magnets 14. As mentioned above, the magnet 14 is a U-shaped structure, and the U-shaped opening faces the transmission shaft 11. The U-shaped openings of the two magnets 14 are opposite to each other to form a circular area to wrap the moving iron core 12 inside.

[0057] When the transmission shaft 11 and the moving iron core 12 are connected, a Figure 5 The tooth groove 111 shown, the moving iron core 12 is fixedly connected to the transmission shaft 11 through the tooth groove 111. The arrangement of the tooth groove 111 can realize a stable connection between the two, so that the moving iron core 12 can drive the transmission shaft 11 to move synchronously.

[0058] The transmission shaft 11 is also sleeved with a closing static iron core 131 and an opening static iron core 132, which are fixed and do not move with the movement of the transmission shaft 11. The outer diameter of the transmission shaft 11 is smaller than the inner diameter of the static iron core, so as to reduce the air resistance (air gap) generated by the moving iron core 12 when it moves. The closing static iron core 131 corresponds to the first coil 151, and the opening static iron core 132 corresponds to the second coil 152.

[0059] The skeleton 17 forms an inner cavity along the axial direction to accommodate the moving iron core 12 and the stationary iron core. The outer diameter of the moving iron core 12 is smaller than the inner cavity of the sleeve of the skeleton 17. An appropriate amount of gap is reserved between the two so that the moving iron core 12 can move flexibly in the inner cavity of the skeleton 17 and reduce the air resistance generated by the moving iron core 12 when moving.

[0060] The materials of the moving iron core 12, the closing static iron core 131, and the opening static iron core 132 are 10# (No. 10 steel) or DT4 (industrial pure iron), which are all materials with good magnetic properties.

[0061] The working principle of the bidirectional magnetic holding mechanism 10 is that when the coil is passed through a forward constant current, the moving iron core 12 drives the transmission shaft 11 to move to the closing static iron core 131 side; when the coil is passed through a reverse constant current, the moving iron core 12 drives the transmission shaft 11 to move to the opening static iron core 132 side.

[0062] like Fig.11 As shown, when the moving iron core 12 is close to the closing static iron core 131, the magnetic lines of force generated by the coil being energized form a closed magnetic loop around the magnetic steel 14 and the yoke 16, so that the moving iron core 12 and the closing static iron core 131 remain attracted; Figure 3 As shown, when the moving iron core 12 is close to the opening static iron core 132, the magnetic lines of force form a closed magnetic loop around the magnetic steel 14 and the yoke 16, so that the moving iron core 12 and the opening static iron core 132 maintain a gap and are attracted.

[0063] Figure 3 When the middle moving iron core 12 and the opening static iron core 132 maintain the gap and are attracted, that is, the opening holding force is reduced, so the operating force required for closing the switch is also reduced accordingly, and the impact force generated when the system is closed is reduced, which solves the problem of excessive closing operating force and impact force causing device instability in the prior art, and effectively improves the comfort of closing the switch.

[0064] Specifically, there are several ways to achieve gap attraction between the moving iron core 12 and the opening static iron core 132 . One way is to directly form an air gap between the moving iron core 12 and the opening static iron core 132 .

[0065] In one possible implementation example, Figure 3As shown, a limiting boss 110 is formed on the transmission shaft 11 , and when the moving iron core 12 moves toward the opening static iron core 132 , the closing static iron core 131 abuts against the limiting boss 110 to form an air gap between the moving iron core 12 and the opening static iron core 132 .

[0066] A limiting boss 110 is formed at the end of the moving iron core 12 near the closing static iron core 131. When opening the switch is required, the moving iron core 12 drives the transmission shaft 11 to move toward the opening static iron core 132. The closing static iron core 131 and the opening static iron core 132 are fixed. At this time, the limiting boss 110 also moves with the transmission shaft 11 toward the opening static iron core 132. When moving to the closing static iron core 131, the limiting boss 110 and the closing static iron core 131 are abutted against each other, which prevents the transmission shaft 11 and the moving iron core 12 from continuing to move toward the opening static iron core 132. In this way, an air gap is formed between the moving iron core 12 and the opening static iron core 132, and the moving iron core 12 and the opening static iron core 132 are opened by gap attraction and maintained in the open state.

[0067] Due to the formation of the air gap, the opening holding force between the moving iron core 12 and the opening static iron core 132 is reduced, and the opening holding force needs to be overcome when closing the switch. As the opening holding force decreases, the closing operating force also decreases.

[0068] In the above example, the closing static iron core 131 abuts against the limiting boss 110 to form a gap attraction between the moving iron core 12 and the opening static iron core 132, thereby reducing the closing operating force by reducing the opening holding force.

[0069] For other possible implementation examples, see Figure 7 A non-magnetic gasket 19 may be provided between the moving iron core 12 and the opening static iron core 132. A non-magnetic, annular gasket 19 is arranged between the opening static iron core 132 and the moving iron core 12 and sleeved on the transmission shaft 11, so that the moving iron core 12 and the opening static iron core 132 are not in direct contact, and the two are separated by the gasket 19 to form a certain gap to reduce the holding force of the opening.

[0070] See also Figure 6 A compression spring 18 may be sleeved on the transmission shaft 11 , the compression spring 18 is located between the transmission shaft 11 and the moving iron core 12 , and one end of the compression spring 18 abuts against the opening static iron core 132 .

[0071] Specifically, a spring groove is provided at the end of the moving iron core 12 , and a compression spring 18 is installed in the spring groove. The compression spring 18 is sleeved on the transmission shaft 11 , and one end of the compression spring 18 abuts against the opening static iron core 132 .

[0072] The setting of the compression spring 18 prevents direct contact between the moving iron core 12 and the opening static iron core 132, that is, a certain gap is formed between the moving iron core 12 and the opening static iron core 132, which can also reduce the opening holding force on the opening side.

[0073] Another way to achieve the gap attraction between the moving iron core 12 and the opening static iron core 132 is to form a fit between the moving iron core 12 and the opening static iron core 132.

[0074] See also Figure 8 A plurality of protrusions 120 are formed on the end surface of the moving iron core 12 facing the opening static iron core 132 , and the moving iron core 12 contacts the opening static iron core 132 through the protrusions 120 .

[0075] For example, three circumferentially evenly distributed protrusions 120 are formed on the end face of the moving iron core 12 facing the opening static iron core 132. The moving iron core 12 contacts the opening static iron core 132 through the protrusions 120. The arc surface of the protrusion 120 contacts the plane of the opening static iron core 132. It can also be understood that the protrusion 120 separates the moving iron core 12 and the opening static iron core 132 by a certain gap, and can also play a role in reducing the holding force on the opening side.

[0076] When the moving iron core 12 and the opening gate static iron core 132 are matched, a stepped step-type mutual adaptation, or a tapered cone and a cone groove mutual adaptation, etc. can be adopted to increase the gap between the moving iron core 12 and the opening gate static iron core 132 to reduce the opening gate holding force.

[0077] For example, a conical surface is formed on the side of the moving iron core 12 facing the opening static iron core 132, and a conical groove is formed on the side of the opening static iron core 132 facing the moving iron core 12; or, the conical surface is arranged on the side of the opening static iron core 132 facing the moving iron core 12, and the conical groove is arranged on the side of the moving iron core 12 facing the opening static iron core 132.

[0078] Another way is to reduce or increase the magnetic holding force on the corresponding side by different thicknesses of the static iron core. Specifically, in the axial direction of the transmission shaft 11, the thickness of the opening static iron core 132 is smaller than the thickness of the closing static iron core 131.

[0079] The thickness of the opening static iron core 132 is small, and the opening holding force is correspondingly small; the thickness of the closing static iron core 131 is large, and the closing holding force is correspondingly large; this also makes it easy to overcome the opening holding force and close the switch easily.

[0080] Figures 1 to 8 Schematic diagram of the bidirectional magnetic latching mechanism 10 in the open state is shown. Figures 9 to 15 A schematic diagram of the bidirectional magnetic latching mechanism 10 in the closed state is shown.

[0081] On this basis, another aspect of the embodiment of the present application further discloses a circuit breaker, including a button mechanism, an operating mechanism, and a bidirectional magnetic holding mechanism 10 as any one of the above items respectively connected to the button mechanism and the operating mechanism.

[0082] The transmission shaft 11 of the bidirectional magnetic holding mechanism 10 drives the operating mechanism to open and close the contact system. When the bidirectional magnetic holding mechanism 10 is operated by the button mechanism, manual opening and closing can be achieved; when the coil of the bidirectional magnetic holding mechanism 10 is powered on and off, automatic opening and closing, as well as remote fault tripping, can be achieved.

[0083] In the embodiment of the present application, a connection groove 11 b is provided at one end of the transmission shaft 11 for connecting with the button mechanism, and a connection hole 11 a is provided at the other end of the transmission shaft 11 for connecting with the operating mechanism.

[0084] It also includes a blocking piece, which is interference-engaged in the connecting groove 11b. The button mechanism is connected by the blocking piece and the connecting groove 11b to achieve a snap-fit ​​sliding connection, and the sliding idle stroke is 1mm to 3mm.

[0085] The circuit breaker is installed on the frame, and the idle stroke is set to ensure that when the circuit breaker is opened, the boss on the button mechanism and the buckle of the frame are unlocked, and the circuit breaker can be reliably pulled out of the frame.

[0086] The circuit breaker includes the same structure and beneficial effects as the bidirectional magnetic latching mechanism 10 in the aforementioned embodiment. The structure and beneficial effects of the bidirectional magnetic latching mechanism 10 have been described in detail in the aforementioned embodiment and will not be repeated here.

[0087] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A bidirectional magnetic latching mechanism (10), characterized in that: It comprises a magnetic assembly and a transmission shaft (11) passing through the magnetic assembly, wherein a moving iron core (12), a closing static iron core (131) and an opening static iron core (132) are sleeved on the transmission shaft (11), the moving iron core (12) is located between the closing static iron core (131) and the opening static iron core (132), and the moving iron core (12) can drive the transmission shaft (11) to move; The magnetic component generates a closed magnetic circuit, so that when the moving iron core (12) approaches the closing static iron core (131), the moving iron core (12) and the closing static iron core (131) remain in an attracted state; when the moving iron core (12) approaches the opening static iron core (132), the moving iron core (12) and the opening static iron core (132) remain gap attracted.

2. The bidirectional magnetic latching mechanism (10) according to claim 1, characterized in that: An air gap is formed between the moving iron core (12) and the opening static iron core (132), and the air gap is realized by any one of the following methods: A limiting boss (110) is formed on the transmission shaft (11), and when the moving iron core (12) moves toward the opening static iron core (132), the closing static iron core (131) abuts against the limiting boss (110), so that the air gap is formed between the moving iron core (12) and the opening static iron core (132); Alternatively, a non-magnetic gasket (19) is sleeved on the transmission shaft (11), and the gasket (19) is located between the moving iron core (12) and the opening static iron core (132); Alternatively, a compression spring (18) is sleeved on the transmission shaft (11), the compression spring (18) is located between the transmission shaft (11) and the moving iron core (12), and one end of the compression spring (18) is in contact with the opening static iron core (132).

3. The bidirectional magnetic latching mechanism (10) according to claim 1, characterized in that: The moving iron core (12) and the opening static iron core (132) form a match, and the matching manner includes at least any one of the following: A plurality of protrusions (120) are formed on the end surface of the moving iron core (12) facing the opening static iron core (132), and the moving iron core (12) is in contact with the opening static iron core (132) through the protrusions (120); When the contact surfaces of the moving iron core (12) and the opening static iron core (132) are matched, they are matched through stepped surfaces or conical surfaces.

4. The bidirectional magnetic latching mechanism (10) according to claim 1, characterized in that: Along the axial direction of the transmission shaft (11), the thickness of the opening static iron core (132) is smaller than the thickness of the closing static iron core (131).

5. The bidirectional magnetic latching mechanism (10) according to any one of claims 1 to 4, characterized in that: The magnetic assembly comprises a yoke (16), a frame (17) and a coil arranged inside the yoke (16), the coil being sleeved outside the frame (17), and further comprises two magnetic steels (14) with opposite polarities arranged relatively outside the moving iron core (12), the magnetic steels (14) being located inside the frame (17); When a positive constant current is passed through the coil, the moving iron core (12) is driven to drive the transmission shaft (11) to move toward the closing static iron core (131); when a negative constant current is passed through the coil, the moving iron core (12) drives the transmission shaft (11) to move toward the opening static iron core (132); and the magnetic lines of force generated by the coil being energized wind around the magnetic steel (14) and the magnetic yoke (16) to form the closed magnetic circuit.

6. The bidirectional magnetic latching mechanism (10) according to claim 5, characterized in that: The coil comprises a first coil (151) and a second coil (152), the first coil (151) corresponds to the closing static iron core (131), and the second coil (152) corresponds to the opening static iron core (132); The first coil (151) and the second coil (152) have the same number of turns, and along the axial direction of the transmission shaft (11), the thickness of the first coil (151) and the thickness of the second coil (152) are the same.

7. The bidirectional magnetic latching mechanism (10) according to claim 5, characterized in that: The material of the magnetic steel (14) is a permanent magnetic material, and the magnetic steel (14) is a U-shaped structure, with the opening of the U-shape facing the transmission shaft (11).

8. A circuit breaker, characterized in that: The invention comprises a button mechanism, an operating mechanism and a bidirectional magnetic holding mechanism (10) as claimed in any one of claims 1 to 7 connected to the button mechanism and the operating mechanism respectively.

9. The circuit breaker according to claim 8, characterized in that One end of the transmission shaft (11) is provided with a connection groove (11b) for connecting with the button mechanism, and the other end of the transmission shaft (11) is provided with a connection hole (11a) for connecting with the operating mechanism.

10. The circuit breaker according to claim 9, characterized in that It also comprises a baffle, which is interference-engaged in the connecting groove (11b); the button mechanism is connected by a snap-fit ​​sliding connection via the baffle and the connecting groove (11b), and the sliding idle stroke is 1 mm to 3 mm.

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