A magnetic latching relay

Abstract

The application discloses a magnetic latching relay, which comprises a shell of a relay, characterized in that an electromagnet assembly is arranged in the shell, a coil in the electromagnet assembly is powered by an internal power supply of an electric meter and / or an external power supply of the electric meter, electromagnetic induction driving force is generated by the electromagnet, the electromagnet is connected with a movable contact assembly in the magnetic latching relay through a transmission mechanism or directly, and the movable contact assembly is driven to press or separate from a static contact assembly in the magnetic latching relay; the magnetic latching relay has the beneficial effects that the electromagnet assembly is powered by the internal power supply of the electric meter and / or the external power supply of the electric meter to generate electromagnetic induction force, input voltage and current are provided, electromagnetic induction force generated by the electromagnet is provided, and the effect that the movable contact assembly and the static contact assembly press or separate is more stable.

Description

Technical Field

[0001] This invention relates to the field of relay technology, and in particular to a magnetic latching relay. Background Technology

[0002] Existing magnetic latching relays used in voltmeters, see reference Figure 8 As shown, a typical magnetic latching relay consists of an electromagnet assembly, a moving armature assembly, a stationary contact assembly, a moving contact assembly, a pusher plate, a relay base, and a relay cover. When the electromagnetic coil of the electromagnet assembly is energized, its magnetic poles change, attracting / repelling the armature assembly, causing the moving armature assembly to actuate. The reciprocating motion of the pusher plate then drives the moving contact assembly, achieving the opening / closing of the moving / stationary contacts. However, existing magnetic latching relays often have the following problems:

[0003] 1. The electromagnet assembly, as a crucial component of a magnetic latching relay, generates an attraction / repulsion force on the armature assembly through the electromagnetic induction force produced by the current. Current technology supplies power to the electromagnet assembly from within the meter. However, due to the low voltage and current within the meter, the electromagnetic induction force generated by the electromagnet's conductivity is also low. This results in a situation where, when the pusher pushes the moving contact assembly to contact the stationary contact assembly, the insufficient pushing force causes a reverse force to be generated between the moving and stationary contacts under overload conditions, causing them to separate and disconnect the power. To reduce contact resistance and temperature rise during contact, silver plating is used. However, under overload conditions, the high temperature generated by the overload melts the silver contacts between the moving and stationary contacts. After cooling, the moving and stationary contacts fuse together. When the operator generates a reverse pulse current within the meter to separate the moving and stationary contacts, the insufficient electromagnetic induction force generated by the electromagnet means that the pusher cannot overcome the contact pressure of the silver contacts, causing a control failure. 1. The device displays that the moving contact assembly is disengaged from the stationary contact assembly, but in reality, they are not disengaged. The meter remains powered, preventing operators from automatically controlling the magnetic latching relay. 2. Generally, electromagnetic relays push a pusher plate to press the moving contact assembly against the stationary contact assembly. The pushing force of the pusher plate is applied by the electromagnet assembly through the moving armature assembly. The moving armature assembly is an equal-arm rotating structure, meaning the input force through the moving armature assembly equals the output force. Therefore, the pushing force of the pusher plate equals the electromagnetic induction force generated by the electromagnet assembly. However, the power supply to the electromagnet assembly is from within the meter. Due to the low voltage and current within the meter, the electromagnetic force converted from electromagnet conduction is also low. Furthermore, the equal-force transmission during the moving armature assembly's operation results in a low pushing force of the pusher plate. The armature of the moving armature assembly is unstable when pressed against the yoke of the electromagnet assembly, and the armature may jump during this contact. Moreover, prolonged and frequent impacts of the armature against the yoke can easily damage the yoke, affecting the stability of the magnetic latching relay's performance. Summary of the Invention

[0004] The magnetic holding relay of the present application can increase the supply voltage of the electromagnet assembly, thereby increasing the electromagnetic induction force generated by the electromagnet assembly, and can amplify the electromagnetic induction force during force transmission by the electromagnetic induction force transmission mechanism.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solution: a magnetic holding relay, comprising a relay housing, an electromagnet assembly is arranged in the housing, the coil in the electromagnet assembly is supplied with power by an external power source and / or an internal power source, so that the electromagnet generates an electromagnetic induction driving force, the electromagnet is connected to a movable contact assembly in the magnetic holding relay through a transmission mechanism or directly, to drive the movable contact assembly to press or separate from a stationary contact assembly in the magnetic holding relay.

[0006] To effectively transmit the electromagnetic induction force generated by the electromagnet assembly to the movable contact assembly, the further preferred technical solution is that, in the state of external power supply or external power supply and internal power supply, the transmission mechanism comprises any one of a connecting rod mechanism, a cam slider mechanism, a rocker slider mechanism or an armature assembly.

[0007] To effectively transmit the electromagnetic induction force generated by the electromagnet assembly to the movable contact assembly, the further preferred technical solution is that, in the state of internal power supply, the transmission mechanism comprises any one of a connecting rod mechanism, a cam slider mechanism, a rocker slider mechanism, and the amplification of the electromagnetic induction force is achieved by changing the transmission mechanism arrangement and the length of the force arm, such as in the rocker slider mechanism, the electromagnet assembly is arranged vertically to the rocker slider mechanism, so that the push-pull force of the rocker slider mechanism generated by the electromagnetic induction force is perpendicular to the push-pull force of the movable contact assembly, and the force arm of the rocker slider mechanism generated by the electromagnetic induction force is shorter than the force arm of the movable contact assembly, so that the component force of the electromagnetic induction force to the movable contact assembly is increased.

[0008] In order to realize that the electromagnetic assembly is powered by the power supply in the ammeter and / or the power supply outside the ammeter to generate electromagnetic induction force, and the direction of the electromagnetic induction force can be controlled, the further preferred technical scheme is that the control circuit board is arranged in the shell, the control circuit board is electrically connected with the static contact assembly through the control switch to form the power supply outside the ammeter, the control circuit board rectifies the power supply outside the ammeter or the power supply outside the ammeter and the power supply inside the ammeter at the same time and then supplies power to the electromagnetic assembly, and the signal receiving control module for controlling the direction change of the electromagnetic induction force of the electromagnetic assembly is further arranged on the control circuit board. By arranging the control circuit board in the shell, the 220V external power supply is connected through the static contact assembly, and then the voltage of about 120 volts is provided to the electromagnetic assembly after rectification by the control circuit board, so that the electromagnetic induction force generated by the electromagnetic winding is increased. If the power supply inside the ammeter is also supplied at the same time, a voltage greater than 120 volts can be provided to the electromagnetic assembly, and the electromagnetic induction force generated by the electromagnetic winding can be further increased.

[0009] Moreover, the signal receiving control module arranged on the control circuit board is used to realize the direction change of the electromagnetic induction force generated by the electromagnetic winding, the original structure is changed to realize the direction change of the electromagnetic induction force by changing the direction of the pulse current of the electromagnetic winding, the original power supply control mixed mode is changed to an independent control structure, and the control is more stable.

[0010] In order to improve a transmission mechanism with stable and reliable structure and capable of increasing electromagnetic induction force, the further preferred technical scheme is that the rocker slider mechanism comprises a rocker, the rocker is provided with a connecting hole and is hingedly connected with a driving part in the electromagnetic assembly, one end of the rocker close to the outer frame of the shell is connected with the shell through a first hinged shaft, the other end of the rocker is hingedly connected with one end of a connecting rod through a second hinged shaft, the other end of the connecting rod is hingedly connected with one end of a slider equivalent to a push piece through a third hinged shaft, and the other end of the slider is elastically connected with the moving contact assembly. Since the rocker slider mechanism is at the dead point position after being pressed, a self-locking mechanism is formed. Even if the rocker slider mechanism is stressed, since the pull rod and the connecting rod are in a vertical state, the connecting rod directly transmits the force to the rocker and the first hinged shaft, and the pull rod is no longer stressed, so that the jumping of the original armature assembly during pressing can be avoided. Moreover, the original yoke of the electromagnetic assembly is not damaged due to long-time and high-frequency impact of the armature on the electromagnetic assembly, so that the performance of the magnetic latching relay is more stable.

[0011] In order to provide a solenoid assembly which can realize the push-pull function and has a small structure, the further preferred technical scheme has the following steps: the solenoid assembly comprises an insulating support, a coil is wound on the insulating support, the axial core of the insulating support is a hollow pipe, a static core is arranged at one end of the insulating support, the axial core of the static core is also a hollow pipe, the static core is inserted into the hollow pipe of the insulating support at one end, the end surface of the static core close to the insulating support abuts against the end surface of the insulating support, the other end of the insulating support abuts against a ring-shaped yoke, a pull rod is arranged in the hollow pipe of the insulating support, the pull rod passes through the insulating support and the static core from one end of the yoke to the other end of the static core, the pull rod comprises a magnetic steel, a magnetic baffle plate is arranged at one end of the magnetic steel, a magnetic baffle rod is arranged at the other end of the magnetic steel, a pull head is arranged at the end of the magnetic baffle rod, the magnetic steel is in a bias state close to the magnetic baffle plate on the length direction of the pull rod, the magnetic baffle plate, the magnetic steel and the magnetic baffle rod are connected to form an integrated pull rod through a first copper sleeve, and the first copper sleeve is located at the end of the hollow pipe of the insulating support and abuts against the end surface of the static core. The solenoid assembly with the above structure can form a circular structure, so that the solenoid assembly has a small structure and is helpful for improving the structure of the entire magnetic holding relay.

[0012] In order to provide a good structure for the slider of the moving contact assembly, the further preferred technical scheme has the following steps: the moving contact assembly comprises a conductive sheet, a shunt sheet assembly, and a moving contact, the slider is arranged in cross with the conductive sheet of the moving contact assembly, a through slot is arranged on the shell for placing the slider, a U-shaped groove is arranged on the slider for placing the conductive sheet, an elastic element mounting hole or a shaft is arranged on the side of the slider corresponding to the moving contact, an elastic element is arranged on the elastic element mounting hole or the shaft and abuts against the shunt sheet assembly of the moving contact assembly, the shunt sheet assembly is provided with corresponding moving contacts, the moving contacts are in a stepped shape, and the elastic element is sleeved on the step of the moving contact.

[0013] In order to provide an effective force transmission of the elastic element to the shunt sheet assembly, the further preferred technical scheme has the following steps: the elastic element comprises any one of a spring sheet, a spring, and elastic rubber.

[0014] In order to effectively separate the moving contact assembly from the static contact assembly through the slider, the further preferred technical scheme has the following steps: the slider on one side of the elastic element mounting hole further has a hook portion or a frame portion, the hook portion or the frame portion is located at the end of the slider close to the shunt sheet assembly and close to one side of the static contact assembly, and the hook portion or the frame portion is used for separating the moving contact assembly from the static contact assembly.

[0015] In order to utilize the magnetic field generated by the existing movable contact assembly conducting sheet to provide auxiliary force to the shunt sheet assembly to make the movable contact assembly and the static contact assembly touch pressure, further preferred technical solutions are that a U-shaped magnetic conducting sheet is arranged on the conducting sheet, the U-shaped magnetic conducting sheet is connected with the conducting sheet through two contact points or bosses, and the two end portions of the magnetic conducting sheet are arranged in a half-enclosing state on the side of the shunt sheet assembly close to the static contact assembly.

[0016] Compared with the prior art, the beneficial effects of the present application are: 1. The electromagnet assembly is powered to generate electromagnetic induction force by the power source in the ammeter and / or the power source outside the ammeter, the input voltage and current are provided, and the effect of making the movable contact assembly and the static contact assembly touch pressure or separate is more stable;

[0017] 2. A transmission mechanism with stable and reliable structure is provided, and the transmission mechanism can increase the electromagnetic induction force, and the movable contact assembly and the static contact assembly are driven to touch pressure or separate after the electromagnetic induction force is increased;

[0018] 3. The transmission structure is provided, and after the movable contact assembly and the static contact assembly touch pressure, the electromagnet assembly will not be impacted by the transmission mechanism, the armature can avoid jumping during touch pressure, in addition, the armature is easy to damage the original yoke iron due to long-time and high-frequency impact, and the stability of the performance of the magnetic latching relay is improved;

[0019] 4. The magnetic field generated by the existing movable contact assembly conducting sheet is utilized to provide auxiliary force to the shunt sheet assembly to make the movable contact assembly and the static contact assembly touch pressure.

[0020] 5. The outer periphery of the electromagnetic winding is provided with a cylindrical magnetic shielding cover for electromagnetic interference protection, the original shell is changed to be provided with a magnetic shielding cover alone, and the structure of the magnetic latching relay is more compact. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is the isometric view of the present application;

[0022] Figure 2 is the isometric view of the present application in the retracted state of the rocker slider;

[0023] Figure 3 is the force schematic diagram of the rocker slider when touch pressure;

[0024] Figure 4 is the isometric view of the present application in the extended state of the rocker slider;

[0025] Figure 5 is the isometric view of the present application;

[0026] Figure 6 is the isometric view of the present application;

[0027] Figure 7 The slider shaft view of the application;

[0028] Figure 8 The shaft view of the electromagnet assembly of the application;

[0029] Figure 9 The shaft view of the rocker slider mechanism of the application;

[0030] Figure 10 The initial structure of the electromagnet assembly of the application; Figure 1

[0031] The structure of the electromagnet assembly of the application; Figure 11 Figure 1 The structure of the electromagnet assembly of the application;

[0032] Figure 12 Figure 1 The structure of the electromagnet assembly of the application;

[0033] Figure 13 The principle diagram of the internal and external power supply of the application;

[0034] In the figure: 10. The upper cover; 20. The signal external end; 30. The shell; 31. The first hinged shaft; 40. The moving contact assembly; 41. The moving contact; 42. The conductive sheet; 43. The first shunt sheet; 44. The second shunt sheet; 45. The third shunt sheet; 50. The static contact assembly; 51. The static sheet; 52. The static contact; 53. The first wire; 60. The transmission mechanism; 61. The rocker; 611. The first force arm; 612. The first connecting plate; 613. The first connecting hole; 62. The connecting rod; 621. The second force arm; 622. The second connecting plate; 63. The slider; 631. The U-shaped slot; 632. The slider body; 633. The elastic piece mounting hole;

[0035] 634. The hook part; 70. The electromagnet assembly; 71. The second wire; 72. The connecting rod; 721. The pull head;

[0036] 722. The stop ring; 723. The magnetic stop rod; 724. The first copper sleeve; 725. The magnetic steel; 726. The magnetic stop sheet; 73. The original external power supply end; 74. The static core; 75. The insulating support; 76. The coil; 77. The magnetic shielding cover; 78. The second copper sleeve; 79. The yoke; 80. The control circuit board; 81. The signal receiving control module; 90. The magnetic conductive sheet; 100. The elastic piece; 200. The armature assembly; 300. The push sheet. DETAILED DESCRIPTION

[0037] ​​The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application.

[0038] Embodiment one

[0039] As shown in Figure 1 and Figure 2 , a magnetic latching relay comprises a shell 30, the shell 30 is provided with a plurality of cavities for mounting parts, a plurality of cavities correspond to the openings of the shell 30, the openings are provided with mutually buckling upper covers 10, and an electromagnet assembly 70 is arranged in the first cavity, the electromagnet assembly 70 can adopt a square structure or a circular structure, and a circular structure is preferred in the embodiment, the electromagnet assembly 70 is provided with a pull rod 72 penetrating through the electromagnet assembly 70 along the center, the pull rod 72 can reciprocate in a distance along the axial direction of the electromagnet assembly 70 under the action of electromagnetic induction force, one end of the pull rod 72 extends into a second cavity, a transmission mechanism 60 is arranged in the second cavity to transmit the push-pull force of the pull rod 72 to a movable contact assembly 40, the transmission mechanism 60 is any one of a connecting rod mechanism, a cam slider mechanism, a rocker slider mechanism or an armature assembly 200, and a rocker slider mechanism is preferred in the embodiment, the rocker slider mechanism is arranged perpendicular to the axis of the electromagnet assembly 70, that is, the second cavity is arranged perpendicular to the first cavity, the rocker slider mechanism 70 comprises a rocker 61 away from the movable contact assembly 40 and close to the outer frame of the shell 30, one end of the rocker 61 close to the outer frame of the shell 30 is connected with the shell 30 through a first hinged shaft 31, the first hinged shaft 31 is vertically fixedly arranged in the second cavity and is staggered perpendicular to the axis of the pull rod 72, the rocker 61 is provided with a first connecting hole 613 hinged with a pull head 721 of the pull rod 72 through a pin shaft, the first connecting hole 613 is a waist-shaped hole; the other end of the rocker 61 is hinged with one end of a connecting rod 62 through a second hinged shaft, the other end of the connecting rod 62 is hinged with one end of a slider 63 equivalent to a push piece 300 through a third hinged shaft, the other end of the slider 63 extends into a third cavity and is elastically connected with a movable contact assembly 40 arranged in the third cavity, the movable contact assembly 40 comprises a conductive sheet 42, a shunt sheet assembly and a movable contact 41, the third cavity is arranged parallel to the first cavity and perpendicular to the second cavity, the third cavity is further provided with a stationary contact assembly 50 arranged parallel to the movable contact assembly 40, the stationary contact assembly 50 comprises a stationary sheet 51 and a stationary contact 52 arranged on the stationary sheet 51, the slider 63 is elastically abutted with the shunt sheet assembly and the movable contact 41 of the movable contact assembly 40 through an elastic member 100, the movable contact 41 of the movable contact assembly 40 is abutted on the stationary contact 52 of the stationary contact assembly 50 by the rocker slider mechanism under the action of the electromagnetic induction force of the pull rod 72, as shown inFigure 3 As shown, because the length of the pull rod 72 is less than the length of the connecting rod 62, i.e. the force arm of the electromagnetic induction force on the rocker slider mechanism is shorter than the force arm of the rocker slider mechanism on the movable contact assembly 40, the vertical component F1 of the force F of the pull rod 72 is transmitted to the connecting rod 62 through the rocker slider mechanism under the action of the electromagnetic induction force, i.e. the push-pull force on the movable contact assembly 40 is greater than the push-pull force of the pull rod 72, i.e. the push-pull force on the movable contact assembly 40 is greater than the electromagnetic induction force, so that the rocker slider mechanism can increase the push-pull force on the movable contact assembly 40 generated by the electromagnetic induction force, so that the movable contact assembly 40 and the static contact assembly 50 form a stable touch pressure; moreover, because the rocker slider mechanism is at the dead point position after the touch pressure, a self-locking mechanism is formed, as shown in Figure 4 As shown, even if the rocker slider mechanism is under stress, because the pull rod 72 is in a vertical state with the rocker 61, the connecting rod 62 directly transmits the force to the rocker 61 and the first hinge shaft 31, and the pull rod 72 is no longer under stress, which can avoid the original armature assembly 200 from jumping during touch pressure, and the original yoke iron of the electromagnet assembly 70 is also not prone to damage due to long-time and high-frequency impact of the original armature on the electromagnet assembly 70, so that the performance of the magnetic latching relay is more stable; at the same time, this way of transmitting the electromagnetic induction force through the rocker slider mechanism to push and pull the movable contact assembly 40 and the static contact assembly 50 to touch or separate changes the structure of the original armature assembly 200 for transmitting the electromagnetic induction force, so that the magnetic latching relay structure can be reduced, the space of the shell can be effectively utilized, and the performance of the magnetic latching relay can be improved;

[0040] Further, in order to improve the action stability of the pull rod 72 of the electromagnet assembly 70, an electromagnet assembly 70 is provided in the embodiment, as shown in Figure 10As shown, the electromagnet assembly 70 includes a circular annular insulating support 75, a coil 73 is wound on the insulating support 75 to form a circular electromagnetic winding, the insulating support 75 is hollow tubular along the axial core, one end of the insulating support 75 is provided with a static core 74, the static core 74 is T-shaped structure, the static core 74 is also hollow tubular along the axial core, the static core 74 is inserted into a section of the hollow pipe of the insulating support 75, the end surface of the static core 74 close to the end surface of the insulating support 75 abuts against the end surface of the insulating support 75, and the other end of the insulating support 75 is provided with an annular yoke 79 abutting on the end surface of the insulating support 75, a pull rod 72 is arranged in the hollow pipe of the insulating support 75, the pull rod 72 penetrates the insulating support 75 and the static core 74 from one end of the yoke 79 to the other end of the static core 74, the pull rod 72 includes a magnetic steel 725, one end of the magnetic steel 725 is provided with a magnetic baffle 726, the other end of the magnetic steel 725 is provided with a magnetic baffle rod 723, the end of the magnetic baffle rod 723 is provided with a pull head 721, the magnetic steel 725 is in a biased state close to the side of the magnetic baffle 726 in the length direction of the entire pull rod 72, the magnetic baffle 726, the magnetic steel 725 and the magnetic baffle rod 723 are connected to form an integral pull rod 72 through a first copper sleeve 724, a second copper sleeve 78 is also arranged in the hollow pipe of the insulating support 75 outside the first copper sleeve 724, one end of the second copper sleeve 78 located in the pipe abuts against one end of the static core 74 located in the pipe; the electromagnet assembly 70 with the pull rod 72 with the biased magnetic steel 725 inside forms a stable state of the pull rod 72 when the electromagnetic winding is not powered in the initial state, the magnetic baffle 726 close to the yoke 79 side of the pull rod 72 is magnetized and in contact with the yoke 79, at this time, the pull head 721 of the pull rod 72 is in the extended state, as shown in the figure, and the pull head 721 is in the retracted state when the electromagnetic winding is powered, the magnetic baffle 726 close to the yoke 79 side of the pull rod 72 is demagnetized and separated from the yoke 79, at this time, the pull head 721 of the pull rod 72 is in the retracted state, as shown in the figure. Figure 11 and 12When the magnetic flux path direction formed by the electromagnetic winding after being powered is the same as the magnetic flux path direction formed by the magnetic steel 725, and the magnetic steel 725 is biased, the magnetic flux path formed by the magnetic steel 725 intersects with the magnetic flux path generated by the electromagnetic winding, forming same direction repulsion, so that the pull rod 72 moves from one end of the pull head 721 to one end of the magnetic baffle 726 under the repulsion. Since the magnetic baffle rod 723 is provided with a baffle ring 722, when the baffle ring 722 abuts against the static iron core 74, the contraction stroke of the pull rod 72 is completed. At this time, the rocker slider mechanism drives the movable contact 41 of the movable contact assembly 40 to abut against the static contact 52 of the static contact assembly 50 to form closing. Since the rocker slider mechanism is at the dead point position, even when the contact is overloaded and hits, the force is transmitted to the first hinged shaft 31 by the rocker slider mechanism, without force being applied to the pull rod 72, improving the service life and performance stability of the electromagnet assembly 70, and improving the contact pressure, preventing the contact from tripping. When the magnetic flux path direction formed by the electromagnetic winding after being powered in the opposite direction is opposite to the magnetic flux path direction formed by the magnetic steel 725, and the magnetic steel 725 is biased, the magnetic flux path formed by the magnetic steel 725 intersects with the magnetic flux path generated by the electromagnetic winding, forming opposite direction attraction, so that the pull rod 72 moves from one end of the magnetic baffle 726 to one end of the pull head 721 under the attraction. When the magnetic baffle 726 abuts against the yoke 79, the extension stroke of the pull rod 72 is completed. At this time, the rocker slider mechanism drives the movable contact 41 of the movable contact assembly 40 to separate from the static contact 52 of the static contact assembly 50 to form opening. Since a part of the static iron core 74 extends into the hollow tube of the insulating support 75 and abuts against the first copper sleeve of the pull rod 72, the extension stroke of the pull rod 72 can also be adjusted by adjusting the extension length of the static iron core 74. This electromagnet assembly structure with an embedded pull rod 72 can improve the output force and reduce the structure of the entire magnetic latching relay, making the magnetic latching relay smaller. In order to prevent the electromagnet assembly 70 from being disturbed by external electromagnetic interference and affecting the working performance of the electromagnet assembly 70, a cylindrical magnetic shielding cover 77 is arranged on the outer periphery of the electromagnetic winding for electromagnetic interference protection. In order to prevent the insulating support 75 from deforming under high temperature after the electromagnetic winding is powered, causing the core hollow tube to deform and affecting the reciprocating motion of the pull rod 72, a second copper sleeve 78 is arranged in the hollow tube of the insulating support 75 outside the first copper sleeve 724 for supporting the insulating support 75 and slidingly cooperating with the first copper sleeve 724, improving the sliding performance of the pull rod 72.

[0041] Further, in order to improve the service life and use performance of the rocker slider mechanism, as shown in Figure 5As shown, the rocker 61 comprises two first force arms 611 arranged in parallel and symmetrically, the two first force arms 611 are connected to form a H-shaped rocker through a connecting plate 612, both ends of each first force arm 611 are respectively provided with a hinge hole, the hinge holes on the two first force arms 611 are arranged in a coaxial state in symmetry, in order to reasonably arrange the structure of the rocker 61, the first connecting plate 612 is offset on the first force arm 611 close to one end of the first hinge shaft 31, so that the pull head 721 of the pull rod 72 can pass between the two first force arms 611 and prevent interference with the first connecting plate 612, then a waist-shaped hole arranged in symmetry is formed on the two first force arms 611 along the length direction, and a through hole is formed on the pull head 721, the pull head 721 is connected with the rocker 61 through a pin shaft, and the rocker 61 is driven to rotate around the first hinge shaft 31, this structure has good strength, is convenient for processing and manufacturing, and can reduce cost through stamping of a sheet metal part, is convenient for installation, and has good service life;

[0042] As shown in the figure, Figure 6 The connecting rod 62 adopts a structure similar to the rocker 61, specifically, the connecting rod 62 comprises two second force arms 621 arranged in parallel and symmetrically, the two second force arms 621 are connected to form a H-shaped connecting rod through a second connecting plate 622, both ends of each second force arm 621 are respectively provided with a hinge hole, the hinge holes on the two second force arms 621 are arranged in a coaxial state in symmetry, in order to reasonably arrange the structure of the connecting rod 62, the second connecting plate 622 is offset on the second force arm 621 close to one end of the second hinge shaft;

[0043] As shown in the figure, Figure 7As shown, one end of the slider 63 is hinged to the connecting rod 62, and the other end of the slider 63 is connected to the shunt plate assembly of the movable contact assembly 40 by extending into the third cavity from the second cavity, and a through slot is arranged on the partition plate between the second cavity and the third cavity for placing the slider 63, and the slider 63 is arranged in cross with the conductive sheet 42 of the movable contact assembly 40, therefore, the slider 63 comprises a slider body 632, and a U-shaped groove 631 is arranged on the slider body 632 for placing the conductive sheet 42, and an elastic element mounting hole or shaft corresponding to the movable contact 41 is arranged on the side of the slider 63 corresponding to the movable contact 41 in the embodiment, which is preferably an elastic element mounting hole 633, and an elastic element 100 is arranged in the elastic element mounting hole 633 and abuts against the shunt plate assembly of the movable contact assembly 40, the elastic element 100 is any one of a spring sheet, a spring or elastic rubber, and a spring is preferred in the embodiment, the spring abuts against and is sleeved on the end of the movable contact 41, the shunt plate assembly is provided with the movable contact 41 corresponding to the static contact 52, and the movable contact 41 is a stepped movable contact 41, the spring abuts against and is sleeved on the end of the movable contact 41, when the rocker slider mechanism pushes the shunt plate assembly through the spring, the movable contact 41 on the shunt plate assembly abuts against the static contact 52, so that the contact pressure of the movable contact assembly 40 and the static contact assembly 50 is formed, in order to enable the slider 63 to separate the movable contact assembly 40 and the static contact assembly 50, further, a hook portion or a frame portion is further arranged on the slider body 632 on one side of the elastic element mounting hole 633, which is preferably a hook portion 634 in the embodiment, the hook portion 634 is located at the end of the slider body 632 close to the shunt plate assembly and close to one side of the static contact assembly 50, when the rocker slider mechanism reverses and contracts, the hook portion 634 moves synchronously and drives the movable contact 41 to move in the direction away from the static contact 52, so that the movable contact assembly 40 is separated from the static contact assembly 50, because the length of the pull rod 72 is less than the length of the connecting rod 62, under the action of the electromagnetic force, the force F of the pull rod 72 is transmitted to the connecting rod 62 through the rocker slider mechanism to form a vertical component force F1, that is, the pulling force of the hook portion 634 driving the movable contact assembly 40 is greater than the pushing force of the pull rod 72, that is, the pulling force of the movable contact assembly 40 is greater than the electromagnetic force, therefore, the rocker slider mechanism can increase the pulling force of the electromagnetic force on the movable contact assembly, so that the movable contact assembly 40 and the static contact assembly 50 have greater separation force, and the defect that the pulling force of the original armature assembly is equal to the electromagnetic force and cannot effectively separate the movable contact assembly 40 from the static contact assembly 50 is avoided;

[0044] Further, in order to improve the electromagnetic force generated by the electromagnet assembly 70, a fourth cavity is arranged between the first cavity of the housing 30 and the third cavity, and a control circuit board 80 is arranged in the fourth cavity. The control circuit board 80 is provided with a rectifier, and the control circuit board 80 is connected to the 220V power supply of the static sheet 51 through the first wire 53. Then, the power supply is rectified by the rectifier and supplied to the electromagnetic winding. This power supply mode can improve the low voltage and current of the original power supply in the electric meter. However, due to the limitation of the standard of the voltmeter, the power supply to the electromagnetic winding cannot be improved. By connecting the static sheet 51 to the power supply of the electromagnetic winding, the voltage and current of the power supply can be improved, thereby improving the electromagnetic force generated by the electromagnetic winding. Further, the pushing force when the moving contact assembly 40 and the static contact assembly 50 are in contact and the pulling force when the moving contact assembly 40 and the static contact assembly 50 are separated are improved, thereby improving the stability of the entire magnetic latching relay. In order to further improve the voltage and current of the power supply to the electromagnetic winding, the power supply can be supplied by the electric meter and the external power supply at the same time. That is, the control circuit board 80 is connected to the 220V power supply of the static sheet 51, and the control circuit board 80 is connected to the power supply in the electric meter through the wire. Then, the power supply is rectified by the rectifier of the control circuit board 80 and supplied to the electromagnetic winding through the second wire 71. The voltage of the power supply in the electric meter is generally pulse voltage, and the voltage is about 9 to 12 volts. After the external power supply is rectified, a voltage of about 120 volts can be provided, so that the electromagnetic force generated by the electromagnetic winding is increased. If the power supply is supplied by the electric meter at the same time, a voltage greater than 120 volts can be provided to the electromagnet assembly, thereby further improving the electromagnetic force generated by the electromagnetic winding.

[0045] As shown in Figure 13 the control circuit board 80 is connected to the 220V power supply of the static sheet 51 through the first wire 53. That is, when the magnetic latching relay is in the contact or separation state, the control circuit board 80 and the first wire 53 of the static sheet 51 are in the separation state through the control switch K1. The control circuit board 80 is not connected to the 220V power supply, so as to prevent the control circuit board 80 from being broken down by high voltage and burned out. Only when the direction of the electromagnetic force of the electromagnet assembly 70 is changed, that is, when the moving contact assembly 40 and the static contact assembly 50 of the magnetic latching relay are in the dynamic change state of contact or separation, the control circuit board 80 is connected to the first wire 53 of the static sheet 51 through the control switch K1 and supplied with power;

[0046] Further, in order to utilize the magnetic field generated by the conductive sheet 42 after energization to generate an auxiliary force on the shunt sheet assembly to push the moving contact 41 on the shunt sheet assembly and the static contact 52 to touch or separate, the conductive sheet 42 is provided with a U-shaped magnetic conducting sheet 90, the magnetic conducting sheet 90 is connected with the conductive sheet 42 through two contacts or bosses, preferably contacts in this embodiment, after the magnetic conducting sheet 90 is magnetized by the conductive sheet 42, the two ends of the magnetic conducting sheet 90 are arranged in a semi-enclosed state on one side of the shunt sheet assembly, in this embodiment, the magnetic latching relay replaces the original armature assembly 200 through a biased rocker slider mechanism, so that the space between the electromagnet assembly 70 and the moving contact assembly 40 is increased, even if a control circuit board 80 is provided between the electromagnet assembly 70 and the moving contact assembly 40, but due to the integration technology of the existing control circuit board 80, the structure of the control circuit board 80 is much smaller than the armature assembly 200, therefore, there is enough space to change the structure of the moving contact assembly 40 in this embodiment, generally the moving contact assembly 40 is composed of a conductive sheet 42 and a shunt sheet assembly, a moving contact, the shunt sheet assembly is composed of a first shunt sheet 43, a second shunt sheet 44, and a third shunt sheet 45 stacked together to form a reed stack, one end of the reed stack is riveted together through the moving contact 41, the other end of the reed stack is fixedly riveted with the conductive sheet 42, the number of shunt sheets can be increased or decreased to adjust the elastic performance of the reed stack, preferably, a first arc-shaped bend is arranged in the middle of the first shunt sheet 43, a second arc-shaped bend is arranged in the middle of the second shunt sheet 44, the second arc-shaped bend is sleeved outside the first arc-shaped bend and there is a gap between them, a third arc-shaped bend is arranged in the middle of the third shunt sheet 45, the third arc-shaped bend is sleeved outside the second arc-shaped bend and there is a gap between them, the first arc-shaped bend, the second arc-shaped bend and the third arc-shaped bend are beneficial to improve the elastic performance of the reed stack, to further adjust the elastic performance of the moving reed stack, and the distance between the shunt sheet assembly close to the static contact 52 and the conductive sheet 42 can be regarded as the stroke of the slider 63, by increasing the distance between the shunt sheet assembly and the conductive sheet 42, the separation effect of the moving contact assembly 40 and the static contact assembly 50 can be effectively improved, therefore, there is enough space to increase the distance between the conductive sheet 42 and the shunt sheet assembly for the moving contact assembly 40 in this embodiment, at the same time, in order to improve the touch pressure of the moving contact assembly 40 and the static contact assembly 50, there is also enough space to arrange the magnetic conducting sheet 90, the magnetic field generated by the conductive sheet 42 is guided to one side of the shunt sheet assembly by the magnetic conducting sheet 90, an auxiliary attractive force is applied to guide the shunt sheet assembly to one side of the magnetic conducting sheet 90, to provide an auxiliary touch pressure for the moving contact assembly 40 and the static contact assembly 50 when touching;

[0047] Further, in order to realize the automatic control of the control circuit board 80, realize the control of the direction of the current through the battery winding through external signals, realize the control of the contact pressure and separation of the moving contact assembly 40 and the static contact assembly 50, the control circuit board 80 is provided with a signal receiving control module 81, the original external power supply end part 73 of the electromagnet assembly 70 is modified into a signal external end part 20, which is connected with the voltmeter through the signal external end part 20, and is connected with the signal receiving control module 81 of the control circuit board 80 internally, so as to realize the change of the direction of the power supply current of the electromagnetic winding, and realize the control of the contact pressure and separation of the moving contact assembly 40 and the static contact assembly 50. This control mode changes the original mixed power supply and control mode into an independent control structure, so that the control is more stable, and changes the original control mode that can only change the direction of the power supply current of the electromagnetic winding by disassembling the voltmeter, so as to realize the change of the direction of the power supply current of the electromagnetic winding without disassembling the voltmeter.

[0048] Embodiment Two

[0049] As Figure 1 and Figure 2As shown, in the embodiment, the magnetic latching relay differs from the first embodiment in that the power supply of the electromagnet assembly 70 is supplied by the internal power supply of the electric meter, and the electromagnet assembly 70 is connected to the internal power supply through the original external power supply end 73, without the need to set up a control circuit board 80 to externally connect the external power supply through the electrostatic sheet 51, only by increasing the contact pressure or separation force of the movable contact assembly 40 and the static contact assembly 50 through the rocker slider mechanism. Specifically, it includes a shell 30, the shell 30 is provided with a plurality of cavities for mounting parts, an electromagnet assembly 70 is arranged in the first cavity, the electromagnet assembly 70 adopts a circular structure, the electromagnet assembly 70 is provided with a pull rod 72 penetrating through the electromagnet assembly 70 along the center, the pull rod 72 can reciprocate in a distance along the axial direction of the electromagnet assembly 70 under the action of electromagnetic induction force, one end of the pull rod 72 extends into the second cavity, a rocker slider mechanism is arranged in the second cavity to transmit the push-pull force of the pull rod 72 to the movable contact assembly 40, the rocker slider assembly is perpendicular to the axis of the electromagnet assembly 70, that is, the second cavity is perpendicular to the first cavity, the rocker slider assembly includes a rocker 61 away from the movable contact assembly 40 and close to the outer frame of the shell 30, one end of the rocker 61 close to the outer frame of the shell 30 is connected to the shell 30 through a first hinge shaft 31, the first hinge shaft 31 is vertically arranged in the second cavity and is staggered perpendicular to the axis of the pull rod 72; the other end of the rocker 61 is hingedly connected to one end of a connecting rod 62 through a second hinge shaft, the other end of the connecting rod 62 is hingedly connected to one end of a slider 63 equivalent to a push piece 300 through a third hinge shaft, the other end of the slider 63 extends into a third cavity and is elastically connected to the movable contact assembly arranged in the third cavity, the third cavity is parallel to the first cavity and perpendicular to the second container; the slider 63 abuts against the shunt piece assembly and the movable contact point 41 on the movable contact assembly 40 through a spring, the pull rod 72 presses the movable contact point 41 of the movable contact assembly 40 against the static contact point 51 of the static contact assembly 50 through the rocker slider mechanism under the action of electromagnetic induction force, the movable contact assembly 40 is composed of a conductive sheet 42 and a shunt piece assembly and a movable contact point 42, the shunt piece assembly is composed of a first shunt piece 43, a second shunt piece 44 and a third shunt piece 45 which are laminated together to form a reed laminated body, one end of the reed laminated body is abutted together through the movable contact point 41, the other end of the reed laminated body is fixedly riveted to the conductive sheet 42, a U-shaped magnetic conducting sheet 90 is arranged on the conductive sheet 42, the magnetic conducting sheet 90 is connected to the conductive sheet 42 through two contact points, the two ends of the magnetic conducting sheet 90 are arranged in a half-enclosing state on one side of the shunt piece assembly, that is, the side of the third shunt piece 45 away from the second shunt piece 44, the magnetic conducting sheet 90 guides the magnetic field generated by the conductive sheet 42 to one side of the shunt piece assembly to exert an attractive force to guide the shunt piece assembly to one side of the magnetic conducting sheet 90, thereby providing an auxiliary contact pressure for the movable contact assembly 40 and the static contact assembly 50 when they are in contact.The pull rod 72 presses the movable contact 41 of the movable contact assembly 40 against the static contact 52 of the static contact assembly 50 through the rocker slider mechanism under the action of the electromagnetic induction force, as shown by the arrow; Figure 3 As shown, because the length of the stroke of the pull rod 72 is less than the length of the connecting rod 62, that is, the force arm of the electromagnetic induction force on the rocker slider mechanism is shorter than the force arm of the rocker slider mechanism on the movable contact assembly 40, the vertical component force F1 formed by the force F of the pull rod 72 transmitted to the connecting rod 62 through the rocker slider structure under the action of the electromagnetic induction force, that is, the pushing and pulling force of the movable contact assembly 40 is greater than the pushing and pulling force of the pull rod 72, that is, the pushing and pulling force of the movable contact assembly 40 is greater than the electromagnetic induction force, so that the rocker slider mechanism can increase the pushing and pulling force of the movable contact assembly 40 generated by the electromagnetic induction force, so that the movable contact assembly 40 and the static contact assembly 50 form a stable contact pressure or separation force;

[0050] Embodiment three

[0051] As Figure 8As shown, in this embodiment, by adding a control circuit board 80 in the magnetic latching relay containing the armature assembly 200, then by providing a rectifier on the control circuit board 80, the control circuit board 80 is externally connected to the static sheet 51 through the first lead 53, and then the electromagnetic winding is powered after being rectified by the rectifier. By externally connecting the static sheet 51 to the electromagnetic winding, the voltage and current of the power supply can be improved, thereby improving the electromagnetic induction force generated by the electromagnetic winding. Specifically, it includes a shell 30, the shell 30 is provided with a plurality of cavities, an electromagnet assembly 70 and an armature assembly 200 are respectively arranged in adjacent two cavities, the electromagnet assembly 70 and the armature assembly 200 are arranged in parallel in the adjacent two cavities, the electromagnet assembly 70 is a square structure as a whole, both ends of the electromagnet assembly 70 have a yoke iron extending into both ends of the armature assembly 200, one end of the electromagnet assembly 70 close to the shell 30 is provided with a signal external connection end 20, and the cavity at one end of the electromagnet assembly 70 away from the outer frame of the shell 30 is provided with a control circuit board 80, and a moving contact assembly 40 and a static contact assembly 50 are arranged on the side of the armature assembly 200 away from the electromagnet assembly. The moving contact assembly 40 includes a conductive sheet 42, a shunt sheet assembly, and a moving contact 41, one end of the shunt sheet assembly is fixedly connected with the conductive sheet 42, and the other end is provided with the moving contact 41. The static contact assembly 50 includes a static sheet 51, the static sheet 51 is provided with a static contact 52 corresponding to the moving contact 41, the armature assembly 200 is connected with the shunt sheet assembly through a push piece 300, the electromagnet assembly 70, the armature assembly 200, the moving contact assembly 40, and the static contact assembly 50 are arranged in parallel with each other, the control circuit board 80 is externally connected to the static sheet 51 through the first lead 53, and then the electromagnetic winding of the electromagnet assembly 70 is powered after being rectified by the rectifier. Electromagnetic induction force is generated at both ends of the electromagnet assembly 70 and presses the armature assembly 200 through the yoke iron, and then the push piece 300 drives the moving contact 41 on the shunt sheet assembly to press or separate from the static contact 52 through the armature assembly 200. By externally connecting the static sheet 51 to the electromagnetic winding, the voltage and current of the power supply can be improved, thereby improving the electromagnetic induction force generated by the electromagnetic winding. Further improve the pushing force when the moving contact assembly 40 and the static contact assembly 50 are pressed and the pulling force when they are separated, and improve the stability of the entire magnetic latching relay.

[0052] Embodiment four

[0053] As Figure 9As shown, in the embodiment, the electromagnet assembly 70 is directly connected with the shunt plate assembly of the movable contact assembly 40 through the pull rod 72, one side of the electromagnet assembly 70 is provided with a control circuit board 80, the control circuit board 80 is provided with a rectifier, the control circuit board 80 is externally connected on the static plate 51 through the first lead wire 53, then the power supply of the electromagnetic winding is rectified through the rectifier, specifically, the cavity where the electromagnet assembly 70 is arranged is vertically arranged with the cavities where the movable contact assembly 40 and the static contact assembly 50 are arranged, the electromagnet assembly 70 is a circular structure, the electromagnet assembly 70 is provided with the pull rod 72 which penetrates the electromagnet assembly 70 along the center, under the action of the electromagnetic induction force, the pull rod 72 can reciprocate in a distance along the axial direction of the electromagnet assembly 70, one end of the pull rod 72 extends into the cavity where the movable contact assembly 40 is arranged, the pull rod 72 is directly connected with the shunt plate assembly of the movable contact assembly 40, and pushes the movable contact 41 on the shunt plate assembly to press or separate from the static contact 52 of the static contact assembly 50, one end of the electromagnet assembly 70 close to the shell 30 is provided with a signal external terminal 20, the signal external terminal 20 is connected with the ammeter, and the inside is connected with the control signal receiving module 81 of the control circuit board 80, thereby forming the change control of the power supply current direction of the electromagnetic winding, realizing the press and separation control of the movable contact assembly 40 and the static contact assembly 50, this control mode changes the original control mode, once the fault occurs, the power supply current direction of the electromagnetic winding can be changed without disassembling the ammeter, the power supply current direction of the electromagnetic winding can be changed without disassembling the ammeter, the power supply voltage and current can be improved by externally connecting the static plate 51 to supply power to the electromagnetic winding, thereby improving the electromagnetic induction force generated by the electromagnetic winding, and further improving the thrust when the movable contact assembly 40 and the static contact assembly 50 are pressed and the pulling force when the movable contact assembly 40 and the static contact assembly 50 are separated, thereby improving the stability of the entire magnetic latching relay.

[0054] The above merely shows a preferred embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A magnetic latching relay comprising a housing of the relay, characterized in that, The shell is provided with an electromagnet assembly, the coil of the electromagnet assembly is powered by an external power supply of the electric meter and / or an internal power supply of the electric meter, so that the electromagnet generates electromagnetic induction force, the electromagnet is connected with the moving contact assembly of the magnetic latching relay through a transmission mechanism, and drives the moving contact assembly to press or separate from the static contact assembly of the magnetic latching relay; In the state of external power supply of the electric meter or simultaneous supply of the external power supply of the electric meter and the internal power supply of the electric meter, the transmission mechanism comprises any one of a connecting rod mechanism, a cam slider mechanism, a rocker slider mechanism or an armature assembly; The rocker slider mechanism comprises a rocker, the rocker is provided with a connecting hole and is hinged to a driving part of the electromagnet assembly, one end of the rocker close to the outer frame of the shell is connected to the shell through a first hinged shaft, the other end of the rocker is hinged to one end of a connecting rod through a second hinged shaft, the other end of the connecting rod is hinged to one end of a slider equivalent to a push piece through a third hinged shaft, and the other end of the slider is elastically connected to the moving contact assembly; The electromagnet assembly comprises an insulating support, the coil is wound on the insulating support, the axial core of the insulating support is a hollow pipe, one end of the insulating support is provided with a static core, the axial core of the static core is also a hollow pipe, one end of the static core is inserted into the hollow pipe of the insulating support, the end face of the static core close to the insulating support abuts against the end face of the insulating support, the other end of the insulating support abuts against a ring-shaped yoke, a pull rod is arranged in the hollow pipe of the insulating support, the pull rod passes through one end of the yoke, one end of the static core and the other end of the static core of the insulating support, the pull rod comprises a magnetic steel, one end of the magnetic steel is provided with a magnetic baffle piece, the other end of the magnetic steel is provided with a magnetic baffle rod, the end of the magnetic baffle rod is provided with a pull head, the magnetic steel is in a bias state close to the magnetic baffle piece in the length direction of the whole pull rod, the magnetic baffle piece, the magnetic steel and the magnetic baffle rod are connected to form a whole pull rod through a first copper sleeve, and the first copper sleeve is located at the end of the hollow pipe of the insulating support and abuts against the end face of the static core; The length of the pull rod stroke is smaller than the length of the connecting rod, the force arm of the electromagnetic induction force on the rocker slider mechanism is shorter than the force arm of the rocker slider mechanism on the moving contact assembly, the push-pull force of the moving contact assembly under the action of the electromagnetic induction force is greater than the electromagnetic induction force, the rocker slider mechanism increases the push-pull force of the moving contact assembly generated by the electromagnetic induction force, so that the moving contact assembly and the static contact assembly form stable pressure, the rocker slider mechanism is in a dead point position after pressure, a self-locking mechanism is formed, the pull rod is in a vertical state with the rocker, the connecting rod directly transmits force to the rocker and the first hinged shaft, and the pull rod is no longer subjected to force.

2. A magnetic latching relay as claimed in claim 1, wherein, The shell is provided with a control circuit board, the control circuit board is electrically connected to the static contact assembly through a control switch to form external power supply of the electric meter, the control circuit board rectifies the power supply of the external power supply of the electric meter or the simultaneous supply of the external power supply of the electric meter and the internal power supply of the electric meter and then supplies power to the electromagnet assembly, and the control circuit board is further provided with a signal receiving control module for controlling the direction transformation of the electromagnetic induction force of the electromagnet assembly.

3. A magnetic latching relay as claimed in claim 1, wherein, The moving contact assembly comprises a conductive sheet, a shunt sheet assembly, a moving contact, the slider is arranged crosswise to the conductive sheet of the moving contact assembly, a through slot is arranged on the shell for placing the slider, a U-shaped groove is arranged on the slider for placing the conductive sheet, an elastic member mounting hole or shaft corresponding to the moving contact is arranged on the side of the slider corresponding to the moving contact, an elastic member is arranged on the elastic member mounting hole or shaft and abuts against the shunt sheet assembly of the moving contact assembly, the shunt sheet assembly is provided with corresponding moving contacts, the moving contacts are in a stepped shape, and the elastic member is sleeved on the steps of the moving contacts.

4. A magnetic latching relay as claimed in claim 3, wherein the magnetic latching relay is configured to be powered by a battery. The elastic member comprises any one of a spring and elastic rubber.

5. A latching relay as claimed in claim 4, wherein the magnet is mounted on the housing. The slider on the side of the elastic member mounting hole is further provided with a hook portion or a frame portion, the hook portion or the frame portion is located at the end of the slider close to the shunt sheet assembly and close to the side of the stationary contact assembly, and the hook portion or the frame portion is used for separating the moving contact assembly from the stationary contact assembly.

6. A latching relay as claimed in claim 5, wherein the armature is formed of a magnetic material. A U-shaped magnetic conducting sheet is arranged on the conductive sheet, the U-shaped magnetic conducting sheet is connected to the conductive sheet through two contacts or bosses, and the two ends of the magnetic conducting sheet are arranged in a half-enclosed state on the side of the shunt sheet assembly close to the stationary contact assembly.

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