Magnetic circuit system and electromagnetic relay

Abstract

The invention discloses a magnetic circuit system and an electromagnetic relay. The magnetic circuit system comprises a coil assembly, a first yoke arm, a second yoke arm, a third yoke arm, a fourth yoke arm and an armature assembly, and the coil assembly comprises at least two windings; the first yoke arm and the second yoke arm are connected to the two opposite ends of the coil assembly, the third yoke arm and the fourth yoke arm are connected to the two opposite ends of the coil assembly, the first yoke arm and the third yoke arm are located at the same end, and the second yoke arm and the fourth yoke arm are located at the same end; when the armature assembly is in lap joint with one of the first yoke arm and the third yoke arm and one of the second yoke arm and the fourth yoke arm, the magnetic circuit system is provided with a first magnetic loop. When the armature assembly is in lap joint with the other one of the first yoke arm and the third yoke arm and the other one of the second yoke arm and the fourth yoke arm, the magnetic circuit system is provided with a second magnetic loop. The magnetic flux loss can be reduced, the magnetic energy utilization rate is improved, the electromagnetic attraction is improved, and the action sensitivity is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of relays, and specifically relates to a magnetic circuit system and an electromagnetic relay. Background Art

[0002] In the electrical engineering industry, electromagnetic relays are widely used as a control device. They have a control system (also known as an input circuit) and a controlled system (also known as an output circuit), and are usually used in automatic control circuits. Relays are actually an "automatic switch" that uses a smaller current to control a larger current. Therefore, they play the role of automatic regulation, safety protection, and circuit conversion in the circuit.

[0003] A magnetic latching relay is a type of electromagnetic relay. In existing electromagnetic relays, when the magnetic circuit system is working, the magnetic fields generated by its coil components are likely to interfere with each other, resulting in a reduction in magnetic flux, which in turn leads to lower magnetic efficiency. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a magnetic circuit system and an electromagnetic relay, which can solve the problem that the existing magnetic circuit systems are prone to mutual interference, resulting in a reduction in magnetic flux and thus lower magnetic efficiency.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides a magnetic circuit system, the magnetic circuit system comprising a coil assembly, a first yoke arm, a second yoke arm, a third yoke arm, a fourth yoke arm and an armature assembly, the coil assembly comprising at least two windings;

[0007] The first yoke arm and the second yoke arm are connected to opposite ends of the coil assembly, the third yoke arm and the fourth yoke arm are connected to opposite ends of the coil assembly, and the first yoke arm and the third yoke arm are located at the same end, and the second yoke arm and the fourth yoke arm are located at the same end;

[0008] When the armature assembly overlaps with the first yoke arm, one of the third yoke arm, and one of the second yoke arm and the fourth yoke arm, the magnetic circuit system has a first magnetic circuit;

[0009] When the armature assembly is overlapped with the first yoke arm, the other of the third yoke arm, and the other of the second yoke arm and the fourth yoke arm, the magnetic circuit system has a second magnetic circuit.

[0010] Optionally, when the armature assembly overlaps the first yoke arm and the fourth yoke arm, the magnetic circuit system has a first magnetic circuit; or,

[0011] When the armature assembly overlaps the second yoke arm and the third yoke arm, the magnetic circuit system has a second magnetic circuit.

[0012] Optionally, the first yoke arm, the second yoke arm, the third yoke arm and the fourth yoke arm form a receiving space, and the armature assembly is rotatably disposed in the receiving space;

[0013] When the armature assembly rotates to the first position, the armature assembly overlaps the first yoke arm and the fourth yoke arm;

[0014] When the armature assembly rotates to the second position, the armature assembly overlaps the first yoke arm and the fourth yoke arm.

[0015] Optionally, the first yoke arm, the second yoke arm, the third yoke arm and the fourth yoke arm are all L-shaped, including a first arm and a second arm that are perpendicular to each other, four second arms are connected to the ends of the coil assembly, and four first arms enclose the accommodating space.

[0016] Optionally, the coil assembly includes a first iron core and a second iron core;

[0017] A first winding is wound on the outside of the first iron core, and a second winding is wound on the outside of the second iron core, and the first winding and the second winding have the same winding direction;

[0018] The first yoke arm and the second yoke arm are fixed to two ends of the first core, and the third yoke arm and the fourth yoke arm are fixed to two ends of the second core.

[0019] Optionally, two yoke arms located at one end of the coil assembly are connected together to keep the corresponding magnetic circuit continuously conductive.

[0020] Optionally, the axes of the first iron core and the second iron core are parallel to form a first reference plane, and the first reference plane is perpendicular to the rotation axis of the armature assembly.

[0021] Optionally, the length of the first core is smaller than the length of the second core;

[0022] Along the length direction of the iron core, the first yoke arm and the third yoke arm are arranged at intervals, and the second yoke arm and the fourth yoke arm are arranged at intervals;

[0023] The first yoke arm and the third yoke arm are fixedly connected to the first core at the same time so that the corresponding magnetic circuit is continuously conductive, or the second yoke arm and the fourth yoke arm are fixedly connected to the first core at the same time so that the corresponding magnetic circuit is continuously conductive.

[0024] Optionally, the axes of the first iron core and the second iron core are parallel to form a second reference plane, and the second reference plane is parallel to the rotation axis of the armature assembly.

[0025] Optionally, the length of the first core is equal to the length of the second core;

[0026] Along the rotation axis direction of the armature assembly, the first yoke arm and the third yoke arm are arranged at intervals; the second yoke arm and the fourth yoke arm are connected as a whole so that the corresponding magnetic circuit is continuously conductive; or,

[0027] Along the rotation axis direction of the armature assembly, the second yoke arm and the fourth yoke arm are arranged at intervals; the first yoke arm and the third yoke arm are connected as a whole so that the corresponding magnetic circuit is continuously conductive.

[0028] Optionally, two ends of the first winding extend to form a first pin and a second pin, and two ends of the second winding extend to form a third pin and a fourth pin;

[0029] The second pin and the third pin are electrically connected to connect the first winding with the second winding, and the first pin and the fourth pin are used to receive a low voltage control signal.

[0030] Optionally, the armature assembly includes a first armature, a second armature and a permanent magnet;

[0031] The first armature and the second armature are arranged in parallel and spaced apart, and the permanent magnet is sandwiched between the first armature and the second armature;

[0032] Two ends of the first armature are first magnetic poles with the same polarity, and two ends of the second armature are second magnetic poles with the same polarity. The polarities of the first magnetic pole and the second magnetic pole are opposite.

[0033] Optionally, at least two windings in the coil assembly are connected in series.

[0034] In a second aspect, the present application further provides an electromagnetic relay, comprising the magnetic circuit system as described in the first aspect of the present application.

[0035] Optionally, the electromagnetic relay further comprises a push rod, a dynamic spring assembly and a static spring assembly;

[0036] The armature assembly is connected to one end of the push rod, and the dynamic spring assembly is connected to the other end of the push rod; the static spring assembly is arranged opposite to the dynamic spring assembly, and the dynamic spring assembly can maintain a contact or disconnection state relative to the static spring assembly;

[0037] When forming the first magnetic circuit, the static spring assembly and the dynamic spring assembly remain in one state of contact or disconnection; when forming the second magnetic circuit, the static spring assembly and the dynamic spring assembly remain in another state of contact or disconnection.

[0038] In the embodiment of the present application, two yoke arms are respectively installed and fixed at both ends of the coil assembly, and the coil assembly, the armature assembly and the two yoke arms at both ends of the coil assembly can form a magnetic circuit, and the coil assembly, the armature assembly and the other two yoke arms at both ends of the coil assembly can form another magnetic circuit. At different times, the two magnetic circuits are independent of each other and do not interfere with each other, which can reduce the magnetic flux loss of the magnetic circuit system, improve the magnetic energy utilization of the coil assembly, improve the magnetic efficiency, help to improve the electromagnetic attraction, and improve the action sensitivity of the armature assembly, so that it responds quickly.

[0039] In addition, the magnetic circuit system of other embodiments of the present application also has the following advantages: 1) When the two yoke arms at either end of the coil assembly are connected together, the coil assembly in the magnetic circuit system can be powered off, and both the first magnetic circuit and the second magnetic circuit can remain as a closed magnetic circuit. 2) When two iron cores and two windings are used, the reference plane formed by the two iron cores can be parallel or perpendicular to the rotating axis of the armature assembly, thereby meeting the requirements of miniaturization of installation dimensions and volume in different use environments. 3) The four L-shaped yoke arms form a storage space for installing and placing the armature assembly, which also helps to design the magnetic circuit system to be more compact and lightweight. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is an axonometric diagram of a first electromagnetic relay according to an embodiment of the present application;

[0041] Figure 2 This is an embodiment of the present application Figure 1 Schematic diagram along -Z direction;

[0042] Figure 3 This is an embodiment of the present application Figure 1 Exploded diagram of the magnetic circuit system;

[0043] Figure 4 is an axonometric diagram of a second electromagnetic relay according to an embodiment of the present application;

[0044] Figure 5 This is an embodiment of the present application Figure 4 Schematic diagram along -Z direction;

[0045] Figure 6 This is an embodiment of the present application Figure 4 Exploded diagram of the magnetic circuit system;

[0046] Figure 7 This is an embodiment of the present application Figure 1Schematic diagram of an electromagnetic relay in a closed state;

[0047] Figure 8 This is an embodiment of the present application Figure 1 Schematic diagram of the electromagnetic relay in the disconnected state;

[0048] Fig. 9 This is an embodiment of the present application Figure 4 Schematic diagram of the electromagnetic relay in a closed state;

[0049] Fig.10 This is an embodiment of the present application Figure 4 Schematic diagram of the electromagnetic relay in the disconnected state;

[0050] Fig.11 is a simplified schematic diagram of another magnetic circuit system of an embodiment of the present application;

[0051] Fig.12 is a simplified schematic diagram of another magnetic circuit system of an embodiment of the present application;

[0052] Fig.13 It is a plan view of the armature assembly of an embodiment of the present application.

[0053] Reference numerals:

[0054] Coil assembly-10, first yoke arm-21, second yoke arm-22, third yoke arm-23, fourth yoke arm-24, first arm-2a, second arm-2b, accommodating space-25, armature assembly-30, rotating shaft-31, pushing rod-40, movable spring assembly-41, static spring assembly-42, first armature-301, second armature-302, movable contact-411, movable spring sheet-412, movable spring lead sheet-413, static contact-421, static spring lead sheet-422. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0056] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here. In addition, the "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally represents that the objects associated with each other are in an "or" relationship.

[0057] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0058] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] The magnetic circuit system and the electromagnetic relay provided in the embodiments of the present application are described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0060] Reference Figures 1 to 6 , shows a schematic structural diagram of a magnetic circuit system according to an embodiment of the present application, the magnetic circuit system comprises a coil assembly 10, a first yoke arm 21, a second yoke arm 22, a third yoke arm 23, a fourth yoke arm 24 and an armature assembly 30, the coil assembly 10 comprises at least two windings;

[0061] The first yoke arm 21 and the second yoke arm 22 are connected to opposite ends of the coil assembly 10, the third yoke arm 23 and the fourth yoke arm 24 are connected to opposite ends of the coil assembly 10, and the first yoke arm 21 and the third yoke arm 23 are located at the same end, and the second yoke arm 22 and the fourth yoke arm 24 are located at the same end;

[0062] When the armature assembly 30 overlaps with the first yoke arm 21, one of the third yoke arm 23, and one of the second yoke arm 22 and the fourth yoke arm 24, the magnetic circuit system has a first magnetic circuit;

[0063] When the armature assembly 30 is overlapped with the other of the first yoke arm 21 and the third yoke arm 23 and the other of the second yoke arm 22 and the fourth yoke arm 24 , the magnetic circuit system has a second magnetic circuit.

[0064] The magnetic circuit system of the embodiment of the present application is a magnetic circuit system used in an electromagnetic relay, such as Figures 1 to 6 The schematic diagram of magnetic circuit systems with different structures is shown in the figure, and the common points are as follows. This magnetic circuit system includes a coil assembly 10, a first yoke arm 21, a second yoke arm 22, a third yoke arm 23, a fourth yoke arm 24 and an armature assembly 30. In the embodiment of the present application, the coil assembly 10 includes at least two windings. The coil assembly 10 of this structure, because the traditional single winding is improved into two or more windings, therefore, when the corresponding winding is formed by winding with enameled wire, its winding circumference becomes shorter and the number of turns increases faster. Therefore, under the same coil length, the number of turns in the winding is more, which can enhance the magnetic attraction of the coil assembly 10. In order to avoid the interference of the magnetic field formed by different windings and prevent the reduction of the magnetic attraction in the embodiment of the present application, the number and position of the yoke arms in the magnetic circuit system are also improved accordingly.

[0065] Combination Figure 1 or Figure 4 As shown in the figure, the first yoke arm 21 and the third yoke arm 23 are installed and fixed at one end of the electromagnetic assembly 10 along the -X direction, and the second yoke arm 22 and the fourth yoke arm 24 are installed and fixed at one end of the electromagnetic assembly 10 along the +X direction. Figure 2 and Figure 5 As shown in the figure, the first yoke arm 21 and the second yoke arm 22 are arranged relatively to each other along the ±X direction, and the third yoke arm 23 and the fourth yoke arm 24 are arranged relatively to each other along the ±X direction. The armature assembly 30 is connected to the rotating shaft 31, one end of the rotating shaft 31 is rotatably connected to the support structure (not shown in the figure) of the electromagnetic relay, and one end of the rotating shaft 31 is rotatably connected to the base structure (not shown in the figure) of the electromagnetic relay, so that the armature assembly 30 can rotate relative to each yoke arm.

[0066] The coil assembly 10 is used to generate a magnetic field in the magnetic circuit system. When the coil assembly 10 is energized, each yoke arm is magnetized to generate magnetism. Under the action of the magnetic force, the armature assembly 30 can rotate in different directions around the rotating shaft 31. When the armature assembly 30 contacts a yoke arm at one end of the +X direction and the -X direction, different magnetic circuits can be formed accordingly. It should be noted that the change in the rotation direction of the armature assembly 30 changes with the direction of the magnetic force of the yoke arm, and the magnetic force of the yoke arm changes with the magnetic field of the coil assembly 10. The magnetic field of the coil assembly 10 changes with the direction of the voltage in the coil assembly 10. The basic theory of the electromagnetic induction principle will not be described in detail in the embodiments of this application.

[0067] Specifically, after the armature assembly 30 rotates, the armature assembly 30 overlaps one of the yoke arms at each end of the coil assembly 10, and the magnetic circuit system forms a corresponding magnetic circuit. Figure 2 As shown in the figure, when the armature assembly 30 is overlapped with one of the first yoke arm 21 and the third yoke arm 23 located in the -X direction, and is also overlapped with one of the second yoke arm 22 and the fourth yoke arm 24 located in the +X direction, the magnetic circuit system has a first magnetic circuit.

[0068] When the armature assembly 30 overlaps with the other of the first yoke arm 21 and the third yoke arm 23 located in the -X direction and also overlaps with the other of the second yoke arm 22 and the fourth yoke arm 24 located in the +X direction, the magnetic circuit system has a second magnetic circuit.

[0069] It can be understood that both the first magnetic circuit and the second magnetic circuit are magnetic circuits formed by the iron core in the coil assembly 10 and the two yoke arms at both ends of the coil assembly 10. Since the armature assembly 30 overlaps the yoke arms at different positions at different times, the first magnetic circuit and the second magnetic circuit can be formed at different times without interference.

[0070] Therefore, in the magnetic circuit system of the embodiment of the present application, two yoke arms are respectively installed and fixed at both ends of the coil assembly 10, and an armature assembly 30 cooperates with the two yoke arms at both ends of the coil assembly 10 to form a corresponding magnetic circuit. Thus, the iron core in the coil assembly 10, the armature assembly 30 and the two yoke arms at both ends of the coil assembly 10 can form a magnetic circuit, and the iron core in the coil assembly 10, the armature assembly 30 and the other two yoke arms at both ends of the coil assembly 10 can form another magnetic circuit. At different times, the two magnetic circuits are independent of each other and do not interfere with each other, which can reduce the magnetic flux loss of the magnetic circuit system, improve the utilization rate of the magnetic energy of the coil assembly 10, improve the magnetic efficiency, help to improve the electromagnetic attraction, and improve the action sensitivity of the armature assembly 30, so that it responds quickly.

[0071] Optionally, refer to Figures 7 to 10, when the armature assembly 30 overlaps with the first yoke arm 21 and the fourth yoke arm 24, the magnetic circuit system has a first magnetic circuit; or,

[0072] When the armature assembly 30 overlaps the second yoke arm 22 and the third yoke arm 23 , the magnetic circuit system has a second magnetic circuit.

[0073] Specifically, in one embodiment, Figure 7 or Fig. 9 As shown in the figure, one end of the armature assembly 30 can overlap with the first yoke arm 21 at one end of the coil assembly 10, and the other end of the armature assembly 30 can overlap with the fourth yoke arm 21 at the other end of the coil assembly 10. At this time, the iron core in the coil assembly 10, the armature assembly 30 and the first yoke arm 21 and the fourth yoke arm 24 can form a first magnetic circuit. Figure 8 or Fig.10 As shown in the figure, at another moment, when the position of the armature assembly 30 changes, one end of the armature assembly 30 can overlap with the second yoke arm 22 at one end of the coil assembly 10, and the other end of the armature assembly 30 can overlap with the third yoke arm 23 at the other end of the coil assembly 10. At this time, the iron core in the coil assembly 10, the armature assembly 30 and the second yoke arm 22 and the third yoke arm 23 can form a second magnetic circuit.

[0074] It should be noted that, in combination with the figure, at any time, the two yoke arms that overlap the armature assembly 30 can be distributed on both sides of the armature assembly 30, for example, the first yoke arm 21 and the fourth yoke arm 24 are distributed on the left and right sides of the armature assembly 30, and the second yoke arm 22 and the third yoke arm 23 are distributed on the left and right sides of the armature assembly 30. This can facilitate the provision of installation space for the armature assembly 30.

[0075] Optionally, refer to Figures 7 to 10 The first yoke arm 21, the second yoke arm 22, the third yoke arm 23 and the fourth yoke arm 24 form a receiving space 25, and the armature assembly 30 is rotatably disposed in the receiving space 25;

[0076] When the armature assembly 30 rotates to the first position, the armature assembly 30 overlaps with the first yoke arm 21 and the fourth yoke arm 24;

[0077] When the armature assembly 30 rotates to the second position, the armature assembly 30 overlaps the first yoke arm 21 and the fourth yoke arm 24 .

[0078] Specifically, if Figure 7 or Fig. 9As shown in FIG. 1 , the portions where the four yoke arms extend from both ends of the coil assembly 10 form a receiving space 25, and the armature assembly 30 is installed and arranged in the receiving space 25, and the ends of the four yoke arms are respectively located at the four corners of the armature assembly 30. In the magnetic circuit system of this structure, two different magnetic circuits can be formed by controlling the armature assembly 30 to rotate in two opposite directions.

[0079] like Figure 7 or Fig. 9 As shown, when the armature assembly 30 rotates clockwise around the rotating shaft 31 to the first position shown in the figure, in the -X direction, the armature assembly 30 overlaps with the first yoke arm 21, and in the +X direction, the armature assembly 30 overlaps with the fourth yoke arm 24, thereby forming Figure 7 or Fig. 9 The first magnetic circuit is shown by the dotted line. Figure 8 or Fig.10 As shown, when the armature assembly 30 rotates counterclockwise around the rotating shaft 31 to the second position shown in the figure, in the -X direction, the armature assembly 30 overlaps with the third yoke arm 23, and in the +X direction, the armature assembly 30 overlaps with the second yoke arm 22, thereby forming Figure 8 or Fig.10 The second magnetic circuit is indicated by the dashed line.

[0080] This layout structure in which the armature assembly 30 is installed in the space surrounded by four yoke arms has a higher degree of integration, which is conducive to making the size and volume of the magnetic circuit system smaller and helps to achieve miniaturized development and design of the product.

[0081] Optionally, refer to Figures 1 to 6 The first yoke arm 21, the second yoke arm 22, the third yoke arm 23 and the fourth yoke arm 24 are all L-shaped, including a first arm 2a and a second arm 2b that are perpendicular to each other. The four first arms 2a are connected to the ends of the coil assembly 10, and the four second arms 2b surround the accommodating space 25.

[0082] Specifically, in one embodiment, Figures 1 to 6 As shown in the embodiment of the present application, the first yoke arm 21, the second yoke arm 22, the third yoke arm 23 and the fourth yoke arm 24 are all magnetic conductive parts, and these yoke arms can be made of electrical pure iron with relatively high magnetic permeability. These yoke arms can include a first arm 2a and a second arm 2b that are perpendicular to each other, and the length of the first arm 2a can be smaller than the second arm 2b, forming an L-shaped magnetic conductive part. The second arm 2b of each yoke arm can be provided with a mounting hole connected to the end of the coil assembly 10, and the length direction of the second arm 2b is parallel to the ±Y direction shown in the figure, and the length direction of the first arm 2a is parallel to the ±X direction shown in the figure.

[0083] Combined with the diagram, it is easy to understand that, along the ±X direction, the first yoke arm 21 and the second yoke arm 22 are located at both ends of the coil assembly 10, and the third yoke arm 23 and the fourth yoke arm 24 are located at both ends of the coil assembly 10. Along the ±Y direction, the first arm 2a of the first yoke arm 21 and the first arm 2a of the third yoke arm 23 are arranged at intervals, and the first arm 2a of the second yoke arm 22 and the first arm 2a of the fourth yoke arm 24 are arranged at intervals. Thus, the ends of the four yoke arms enclose a receiving space 25 for receiving the armature assembly 30. It can be understood that when the armature assembly 30 rotates in the receiving space 25, it can contact the first arm 2a at different positions respectively, thereby forming different magnetic circuits.

[0084] Optionally, refer to Figure 2 or Figure 5 , the coil assembly 10 includes a first iron core 101 and a second iron core 102;

[0085] A first winding is wound around the outside of the first iron core 101, and a second winding is wound around the outside of the second iron core 102, and the first winding and the second winding have the same winding direction;

[0086] The first yoke arm 21 and the second yoke arm 22 are fixed to two ends of the first core 101 , and the third yoke arm 23 and the fourth yoke arm 24 are fixed to two ends of the second core 102 .

[0087] Specifically, the coil assembly 10 generally includes a winding and an iron core inserted into the winding. In one embodiment, compared to the conventional coil assembly 10, Figure 2 or Figure 5 As shown, the coil assembly 10 of the embodiment of the present application includes a first core 101 and a second core 102. The first core 101 and the second core 102 are both bar-shaped structures, and the two cores are parallel to each other. A coil support can be installed outside each core, and the two coil supports can be connected together by short-circuiting the connection pins of the two windings on the two coil supports. Exemplarily, the first winding and the second winding can be connected in series.

[0088] Correspondingly, in the coil assembly 10 with a double core and double winding structure, a mounting hole for connecting to one end of the first core 101 is provided on the first yoke arm 21, and a mounting hole for connecting to the other end of the first core 101 is provided on the second yoke arm 22. The two ends of the first core 101 are respectively inserted into the corresponding mounting holes, and fixed connection with the first yoke arm 21 and the second yoke arm 22 is achieved by riveting. The first core 101, the first yoke arm 21 and the second yoke arm 22 form a first frame structure that is approximately gate-shaped or C-shaped.

[0089] Similarly, the third yoke arm 23 is provided with a mounting hole for connecting to one end of the second core 102, and the fourth yoke arm 24 is provided with a mounting hole for connecting to the other end of the second core 102. The two ends of the second core 102 are respectively inserted into the corresponding mounting holes, and fixed connection with the third yoke arm 23 and the fourth yoke arm 24 is achieved by riveting. The second core 102, the third yoke arm 23 and the fourth yoke arm 24 form a second frame structure that is approximately gate-shaped or C-shaped.

[0090] The coil assembly 10 with a double core and double winding structure has a shorter circumference around a single core and a faster increase in the number of turns. Therefore, the number of turns can be increased under the same coil length, thereby improving the overall magnetic attraction of the coil assembly 10.

[0091] in addition, Fig.11 The coil assembly 10 also briefly illustrates a magnetic circuit system structure including three cores, the three cores being the first core 101, the second core 102, and the third core 103, each core being wound with enameled wire to form a winding, and the three windings can also be connected in series. In combination with the introduction of the aforementioned embodiment, it is easy to understand that the coil assembly 10 with three windings can also increase the magnetic attraction by increasing the number of coil turns. At this time, the first yoke arm 21 and the second yoke arm 22 can be fixed at both ends of the first core 101 and the second core 102 at the same time, and the third yoke arm 23 and the fourth yoke arm 24 can be fixed at both ends of the third core 103. In this magnetic circuit system, the windings on the first core 101 and the second core 102 and the first yoke arm 21, the armature assembly 30 and the fourth yoke arm 24 can form a first magnetic circuit, and the windings on the third core 103 and the second yoke arm 22, the armature assembly 30 and the third yoke arm 23 can form a second magnetic circuit.

[0092] Fig.12The coil assembly 10 is also briefly illustrated to include a magnetic circuit system structure of four cores, the four cores being a first core 101, a second core 102, a third core 103 and a fourth core 104, each core being wound with enameled wire to form a winding, and the four windings can also be connected in series. Combined with the introduction of the aforementioned embodiment, it is easy to understand that the coil assembly 10 with four windings can also enhance the magnetic attraction by increasing the number of coil turns. At this time, the first yoke arm 21 and the second yoke arm 22 can be fixed at both ends of the first core 101 and the second core 102 at the same time, and the third yoke arm 23 and the fourth yoke arm 24 can be fixed at both ends of the third core 103 and the fourth core 104. In this magnetic circuit system, the windings on the first core 101 and the second core 102 and the first yoke arm 21, the armature assembly 30 and the fourth yoke arm 24 can form a first magnetic circuit, and the windings on the third core 103 and the fourth core 104 and the second yoke arm 22, the armature assembly 30 and the third yoke arm 23 can form a second magnetic circuit.

[0093] For the coil assembly 10 formed by a larger number of cores and windings, the present application embodiment will not be described one by one. It should be noted that when the number of cores and the corresponding windings is an odd number, the magnetic force of the first magnetic circuit and the second magnetic circuit can be the same by controlling the number of turns of the coil or the material of the core, that is, the magnetic force driving the armature assembly 30 to rotate clockwise or counterclockwise is the same.

[0094] Alternatively, if Figure 3 or Figure 6 As shown, the two yoke arms located at one end of the coil assembly 10 are connected together to keep the corresponding magnetic circuit continuously conductive.

[0095] Specifically, in the magnetic circuit system of the embodiment of the present application, the two yoke arms at one end of the coil assembly 10 can also be connected together, such as Figure 3 or Figure 6 As shown, the second yoke arm 22 and the fourth yoke arm 24 can be connected together. Therefore, when the coil assembly 10 is powered off, both the first magnetic circuit and the second magnetic circuit are closed magnetic circuits that are not disconnected, and the magnetic attraction can be maintained, so that the magnetic circuit system maintains the operating state when powered on, and the magnetic holding function is realized.

[0096] Optionally, refer to Figure 7 or Figure 8 The axes of the first iron core 101 and the second iron core 102 are parallel to form a first reference plane, and the first reference plane is perpendicular to the rotation axis of the armature assembly 30.

[0097] Specifically, in one embodiment, Figure 7 or Figure 8As shown in the figure, the armature assembly 30 is installed in the accommodation space 25, and its rotation axis is parallel to the Z direction. The axes of the first core 101 and the second core 102 can be parallel to the ±X directions shown in the figure, and the axes of the two can form a first reference plane. At the same time, the first reference plane is also perpendicular to the rotation axis of the armature assembly 30. That is, Figure 7 or Figure 8 In the diagram, the first core 101 and the second core 102 are laid flat in a plane parallel to the XOY plane. The electromagnetic component 10 with a double core and double winding structure can effectively reduce the structural dimensions in the ±Z direction, and can be suitable for electromagnetic relays and installation environments with relatively compact space in the ±Z direction.

[0098] Optionally, refer to Figure 7 or Figure 8 , the length of the first core 101 is smaller than the length of the second core 102;.

[0099] Along the length direction of the core, the first yoke arm 21 and the third yoke arm 23 are arranged at intervals, and the second yoke arm 22 and the fourth yoke arm 24 are arranged at intervals;

[0100] The first yoke arm 21 and the third yoke arm 23 are fixedly connected to the first core 101 at the same time so that the corresponding magnetic circuit is continuously conductive, or the second yoke arm 22 and the fourth yoke arm 24 are fixedly connected to the first core 101 at the same time so that the corresponding magnetic circuit is continuously conductive.

[0101] Specifically, in one embodiment, when the two cores in the coil assembly 10 are arranged in accordance with Figure 7 or Figure 8 When the positions are arranged as shown, the length of the first core 101 can be designed to be smaller than the length of the second core 102, and one end of the first core 101 and the second core 102 are aligned. Accordingly, the other ends of the first core 101 and the second core 102 form a staggered length difference. The second core 102, the third yoke arm 23 and the fourth yoke arm 24 surround the first core 101, the first yoke arm 21 and the second yoke arm 22 inside. . Thus, a more compact structural design of the magnetic circuit system can be achieved, and the structural size of the magnetic circuit system can be further reduced, so as to realize the miniaturization and miniaturization design of the electromagnetic relay.

[0102] When the two cores in the coil assembly 10 are Figure 7 or Figure 8When the positions are arranged as shown, along the length direction of any core (i.e., the ±X direction shown in the figure), since the length of the first core 101 is relatively short, after the first yoke arm 21 is fixed to the end of the first core 101, and after the third yoke arm 23 is fixed to the end of the second core 102, the gap between the first yoke arm 21 and the third yoke arm 23 separates and isolates the two from each other. In addition, since the other ends of the first core 101 and the second core 102 are in an aligned arrangement, the first core 101 is not only fixed to the second yoke arm 22, but also passes through the mounting hole on the second yoke arm 22 and is fixed to the fourth yoke arm 24.

[0103] Combination Figure 7 or Figure 8 As shown in the figure, the second yoke arm 22 and the fourth yoke arm 24 are simultaneously fixedly connected to the first core 101, so that after the coil assembly 10 in the magnetic circuit system is powered off, both the first magnetic circuit and the second magnetic circuit remain as closed magnetic circuits, and the armature assembly 30 can be maintained in a Figure 7 or Figure 8 The illustrated magnetic contact state means that the electromagnetic relay can maintain a closed or open state under the action of the corresponding first magnetic circuit or the second magnetic circuit.

[0104] In addition, it should be noted that, in some embodiments, the above-mentioned magnetic circuit system can also be designed as the second yoke arm 22 and the fourth yoke arm 24 are arranged at intervals, and the first yoke arm 21 and the third yoke arm 23 are fixedly connected to the first core 102 at the same time. This magnetic circuit system has the same advantages as the above-mentioned magnetic circuit system, and will not be further described in the embodiments of the present application.

[0105] Optionally, refer to Fig. 9 or Fig.10 The axes of the first iron core 101 and the second iron core 102 are parallel to form a second reference plane, and the second reference plane is parallel to the rotation axis of the armature assembly 30.

[0106] Specifically, in one embodiment, Fig. 9 or Fig.10 As shown in the figure, the armature assembly 30 is installed in the accommodation space 25, and its rotation axis is parallel to the ±Z direction. The axes of the first iron core 101 and the second iron core 102 can be parallel to the ±X direction shown in the figure, and the axes of the two can form a second reference plane. At the same time, the second reference plane is also parallel to the rotation axis of the armature assembly 30. That is, Fig. 9 or Fig.10In the diagram, the first core 101 and the second core 102 are stacked along the ±Z direction in a plane parallel to the XOZ plane. The electromagnetic component 10 with a double core and double winding structure can effectively reduce the structural size in the XOY plane, and can be suitable for electromagnetic relays and installation environments with relatively compact space in the XOZ plane.

[0107] Optionally, refer to Fig. 9 or Fig.10 , the length of the first core 101 is equal to the length of the second core 102;

[0108] Along the rotation axis direction of the armature assembly 30, the first yoke arm 21 and the third yoke arm 23 are arranged at intervals, and the second yoke arm 22 and the fourth yoke arm 24 are connected as a whole so that the corresponding magnetic circuit is continuously conductive; or,

[0109] Along the rotation axis direction of the armature assembly 30 , the second yoke arm 22 and the fourth yoke arm 24 are arranged at intervals; the first yoke arm 21 and the third yoke arm 23 are connected as a whole so that the corresponding magnetic circuits are continuously conductive.

[0110] Specifically, in one embodiment, when the two cores in the coil assembly 10 are arranged in accordance with Fig. 9 or Fig.10 When the positions are arranged as shown, the length of the first core 101 can be designed to be equal to the length of the second core 102, and the two ends of the first core 101 and the second core 102 are aligned. Accordingly, the first yoke arm 21 and the third yoke arm 23 located at the same end of the first core 101 and the second core 102 are stacked along the ±Z direction, and the second yoke arm 22 and the fourth yoke arm 24 located at the same end of the first core 101 and the second core 102 are stacked along the ±Z direction. Figure 7 or Figure 8 The indication is similar to that of Fig. 9 or Fig.10 Another compact and small magnetic circuit system is shown, which can also further reduce the structural size of the magnetic circuit system to facilitate the miniaturization and miniaturization design of the electromagnetic relay.

[0111] When the two cores in the coil assembly 10 are Fig. 9 or Fig.10When the positions are arranged as shown, along the length direction of any core (i.e., the ±X direction shown in the figure), since the first core 101 and the second core 102 are of equal length and aligned. Therefore, along the ±Z direction shown in the figure, when the first yoke arm 21 and the third yoke arm 23 are stacked, they can be spaced apart by a preset distance, and the preset distance allows the first yoke arm 21 and the third yoke arm 23 to be separated and isolated from each other. When the second yoke arm 22 and the fourth yoke arm 24 are stacked, the two can be connected as one. Specifically, during processing and manufacturing, a piece of metal can be used to form the second yoke arm 22 and the fourth yoke arm 24 connected as one piece by cutting and bending.

[0112] Combination Fig. 9 or Fig.10 As shown in the figure, the second yoke arm 22 and the fourth yoke arm 24 are connected as one body, so that after the electromagnetic assembly 10 in the magnetic circuit system is powered off, both the first magnetic circuit and the second magnetic circuit remain as a closed circuit, and the armature assembly 30 can be maintained in a Fig. 9 or Fig.10 The illustrated magnetic contact state means that the electromagnetic relay can maintain a closed or open state under the action of the corresponding first magnetic circuit or the second magnetic circuit.

[0113] In addition, it should be noted that, in some embodiments, the above-mentioned magnetic circuit system can also be designed so that the second yoke arm 22 and the fourth yoke arm 24 are separated by a preset distance, and the first yoke arm 21 and the third yoke arm 23 are connected as a whole. This magnetic circuit system has the same advantages as the above-mentioned magnetic circuit system, and will not be further described in the embodiments of the present application.

[0114] Optionally, two ends of the first winding extend to form a first pin and a second pin, and two ends of the second winding extend to form a third pin and a fourth pin;

[0115] The second pin and the third pin are electrically connected to connect the first winding and the second winding, and the first pin and the fourth pin are used to receive a low voltage control signal.

[0116] Specifically, in the embodiment of the present application, the aforementioned first winding and the second winding can be windings formed by two rolls of enameled wire respectively wound, and the two ends extending after one roll of enameled wire is wound to form the first winding are the first pin and the second pin respectively, and the two ends extending after the other roll of enameled wire is wound to form the second winding are the third pin and the fourth pin respectively. The second pin and the third pin can be welded or short-circuited through a connector, so that the first winding and the second winding are connected in series, and the remaining first pin and the second pin are exposed to the outside as the pins of the coil assembly, which are used to connect the control device and receive the low-voltage control signal sent from the control device. In addition, it should be noted that the winding rotation direction of the enameled wire on the first winding and the second winding is the same, so as to ensure that the magnetic force generated after the two windings are energized is in the same direction, thereby enhancing the magnetic force and avoiding the magnetic force offset attenuation.

[0117] Optionally, refer to Fig.13 , the armature assembly 30 includes a first armature 301, a second armature 302 and a permanent magnet;

[0118] The first armature 301 and the second armature 302 are arranged in parallel and spaced apart, and the permanent magnet is sandwiched between the first armature 301 and the second armature 302;

[0119] Two ends of the first armature 301 are first magnetic poles with the same polarity, and two ends of the second armature 302 are second magnetic poles with the same polarity. The polarities of the first magnetic pole and the second magnetic pole are opposite.

[0120] Specifically, no matter the magnetic circuit system adopts the Figure 7 , Figure 8 The schematic structure is Fig. 9 , Fig.10 The schematic structure is as follows: Fig.13 As shown in the figure, the armature assembly 30 may include a first armature 301, a second armature 302 and a permanent magnet (not shown in the figure). Specifically, the first armature 301 and the second armature 302 may be strip-shaped magnetic conductive parts, and the two armatures may be injection molded with the permanent magnet and a plastic shell or bracket that wraps the permanent magnet. Under the magnetization of the permanent magnet, the first armature 301 and the second armature 302 may form different magnetic poles. For example, Figures 7 to 10 As shown in FIG. 1 , along the ±X direction, both ends of the first armature 301 are N poles, and both ends of the second armature 3012 are S poles.

[0121] Combination Figures 7 to 10It is easy to understand that the force acting on one end of the first armature 301 is suction, and the force acting on the same end of the second armature 30 is repulsion. At the same time, the force acting on the other end of the first armature 301 is repulsion, and the force acting on the same end of the second armature 30 is suction. That is, in the figure, along the Y direction, one side of the left and right sides is suction, and the other side is repulsion, thereby forming a torque that drives the armature assembly 30 to rotate.

[0122] Optionally, at least two windings in the coil assembly 10 are connected in series.

[0123] Specifically, in some embodiments, when there are at least two windings in the coil assembly 10, the windings can be electrically connected to each other in series. It is easy to understand that when the operating voltage remains unchanged, at least two windings are connected in series, which is conducive to reducing the power consumption of the entire coil assembly 10, reducing the consumption of electrical energy, and making the product more energy-efficient and having lower use costs.

[0124] The present application also provides an electromagnetic relay, comprising a magnetic circuit system as disclosed in any of the aforementioned embodiments of the present application.

[0125] In the embodiment of the present application, the above-mentioned magnetic circuit system and other modules such as the contact system can be combined into an electromagnetic relay. Based on the advantages of the above-mentioned magnetic circuit system, the electromagnetic relay in the embodiment of the present application has less magnetic interference, higher magnetic utilization, stronger magnetic force, and higher working sensitivity.

[0126] Optionally, refer to Figures 1 to 4 , the electromagnetic relay further comprises a push rod 40, a dynamic spring assembly 41 and a static spring assembly 42;

[0127] The armature assembly 30 is connected to one end of the push rod 40, and the dynamic spring assembly 41 is connected to the other end of the push rod 40; the static spring assembly 42 is arranged opposite to the dynamic spring assembly 41, and the dynamic spring assembly 41 can be close to or away from the static spring assembly 42 to maintain a contact or disconnection state;

[0128] When forming the first magnetic circuit, the static spring assembly 42 and the dynamic spring assembly 41 remain in one state of contact or disconnection; when forming the second magnetic circuit, the static spring assembly 42 and the dynamic spring assembly 41 remain in another state of contact or disconnection.

[0129] Specifically, Figures 1 to 4 As shown in FIG. 1 , the contact system of the electromagnetic relay in the embodiment of the present application may include a dynamic spring assembly 41 and a static spring assembly 42 .

[0130] The dynamic spring assembly 41 may include a dynamic contact 411, a dynamic spring piece 412, and a dynamic spring lead-out piece 413. The dynamic spring lead-out piece 413 may be a rigid structure for mounting and fixing the dynamic spring piece 412 having elasticity, and the dynamic spring lead-out piece 413 is also used to form a terminal exposed outside the relay. The dynamic contact 411 may be arranged on the surface of the dynamic spring piece 412, and the push rod 40 is connected to the dynamic spring piece 412. The static spring assembly 42 may include a static contact 421 and a static spring lead-out piece 422. The static spring lead-out piece 422 may be a rigid structure for forming a terminal exposed outside the relay. The static contact 421 may be arranged on the surface of the static spring lead-out piece 422.

[0131] The push rod 40 can be arranged along the ±X direction shown in the figure, one end of the push rod 40 is connected to the movable spring 412, and the other end is connected to the armature assembly 30. For example, a push arm is protruding from the side of the plastic bracket of the armature assembly 30, and the push arm is inserted into the mounting portion at the other end of the push rod 40. When the armature assembly 30 rotates, the push rod 40 can be driven to move along the ±X direction by the push arm.

[0132] like Figure 7 or Fig. 9 As shown in the figure, when the armature assembly 30 rotates clockwise, the push arm drives the push rod 40 to move along the -X direction, and the push rod 40 pushes the moving spring 412 to move upward, so that the moving contact 411 is close to the static contact 421. After the two contact, the relay is in the on state. Figure 8 or Fig.10 As shown in the figure, when the armature assembly 30 rotates counterclockwise, the push arm drives the push rod 40 to move along the +X direction, and the push rod 40 pushes the moving reed 412 to move downward, so that the moving contact 411 is away from the static contact 421. After the two are separated, the relay is in the disconnected state.

[0133] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0134] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A magnetic circuit system, characterized in that: The magnetic circuit system comprises a coil assembly, a first yoke arm, a second yoke arm, a third yoke arm, a fourth yoke arm and an armature assembly, wherein the coil assembly comprises at least two windings; The first yoke arm and the second yoke arm are connected to opposite ends of the coil assembly, the third yoke arm and the fourth yoke arm are connected to opposite ends of the coil assembly, and the first yoke arm and the third yoke arm are located at the same end, and the second yoke arm and the fourth yoke arm are located at the same end; When the armature assembly overlaps with the first yoke arm, one of the third yoke arm, and one of the second yoke arm and the fourth yoke arm, the magnetic circuit system has a first magnetic circuit; When the armature assembly is overlapped with the first yoke arm, the other of the third yoke arm, and the other of the second yoke arm and the fourth yoke arm, the magnetic circuit system has a second magnetic circuit.

2. The magnetic circuit system according to claim 1, characterized in that: When the armature assembly overlaps the first yoke arm and the fourth yoke arm, the magnetic circuit system has a first magnetic circuit; or, When the armature assembly overlaps the second yoke arm and the third yoke arm, the magnetic circuit system has a second magnetic circuit.

3. The magnetic circuit system according to claim 1, characterized in that: The first yoke arm, the second yoke arm, the third yoke arm and the fourth yoke arm form a receiving space, and the armature assembly is rotatably disposed in the receiving space; When the armature assembly rotates to the first position, the armature assembly overlaps the first yoke arm and the fourth yoke arm; When the armature assembly rotates to the second position, the armature assembly overlaps the second yoke arm and the third yoke arm.

4. The magnetic circuit system according to claim 3, characterized in that: The first yoke arm, the second yoke arm, the third yoke arm and the fourth yoke arm are all L-shaped, including a first arm and a second arm perpendicular to each other, four second arms are connected to the ends of the coil assembly, and four first arms surround the accommodating space.

5. The magnetic circuit system according to any one of claims 1 to 4, characterized in that: The coil assembly includes a first core and a second core; A first winding is wound on the outside of the first iron core, and a second winding is wound on the outside of the second iron core, and the first winding and the second winding have the same winding direction; The first yoke arm and the second yoke arm are fixed to two ends of the first core, and the third yoke arm and the fourth yoke arm are fixed to two ends of the second core.

6. The magnetic circuit system according to claim 5, characterized in that: Two yoke arms located at one end of the coil assembly are connected together to keep the corresponding magnetic circuit continuously conductive.

7. The magnetic circuit system according to claim 6, characterized in that: The axes of the first iron core and the second iron core are parallel to form a first reference plane, and the first reference plane is perpendicular to the rotation axis of the armature assembly.

8. The magnetic circuit system according to claim 7, characterized in that: The length of the first core is smaller than the length of the second core; Along the length direction of the iron core, the first yoke arm and the third yoke arm are arranged at intervals, and the second yoke arm and the fourth yoke arm are arranged at intervals; The first yoke arm and the third yoke arm are fixedly connected to the first core at the same time so that the corresponding magnetic circuit is continuously conductive, or the second yoke arm and the fourth yoke arm are fixedly connected to the first core at the same time so that the corresponding magnetic circuit is continuously conductive.

9. The magnetic circuit system according to claim 6, characterized in that: The axes of the first iron core and the second iron core are parallel to form a second reference plane, and the second reference plane is parallel to the rotation axis of the armature assembly.

10. The magnetic circuit system according to claim 9, characterized in that: The length of the first core is equal to the length of the second core; Along the rotation axis direction of the armature assembly, the first yoke arm and the third yoke arm are arranged at intervals; the second yoke arm and the fourth yoke arm are connected as a whole so that the corresponding magnetic circuit is continuously conductive; or, Along the rotation axis direction of the armature assembly, the second yoke arm and the fourth yoke arm are arranged at intervals; the first yoke arm and the third yoke arm are connected as a whole so that the corresponding magnetic circuit is continuously conductive.

11. The magnetic circuit system according to claim 6, characterized in that: Two ends of the first winding extend to form a first pin and a second pin, and two ends of the second winding extend to form a third pin and a fourth pin; The second pin and the third pin are electrically connected to connect the first winding with the second winding, and the first pin and the fourth pin are used to receive a low voltage control signal.

12. The magnetic circuit system according to claim 1, characterized in that: The armature assembly includes a first armature, a second armature and a permanent magnet; The first armature and the second armature are arranged in parallel and spaced apart, and the permanent magnet is sandwiched between the first armature and the second armature; Two ends of the first armature are first magnetic poles with the same polarity, and two ends of the second armature are second magnetic poles with the same polarity. The polarities of the first magnetic pole and the second magnetic pole are opposite.

13. The magnetic circuit system according to claim 1, characterized in that: At least two windings in the coil assembly are connected in series.

14. An electromagnetic relay, characterized in that: Comprising the magnetic circuit system according to any one of claims 1 to 13.

15. The electromagnetic relay according to claim 14, characterized in that: Also includes a push rod, a dynamic spring assembly and a static spring assembly; The armature assembly is connected to one end of the push rod, and the dynamic spring assembly is connected to the other end of the push rod; the static spring assembly is arranged opposite to the dynamic spring assembly, and the dynamic spring assembly can be close to or away from the static spring assembly to maintain a contact or disconnection state; When forming the first magnetic circuit, the static spring assembly and the dynamic spring assembly remain in one state of contact or disconnection; when forming the second magnetic circuit, the static spring assembly and the dynamic spring assembly remain in another state of contact or disconnection.

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