Magnetic latching electromagnetic system and relay

Abstract

The utility model relates to the technical field of switching devices, in particular to a magnetic latching electromagnetic system and a relay, which comprises a fixed iron core assembly, a movable iron core assembly and a coil assembly, and is characterized in that the fixed iron core assembly comprises a fixed iron core and a permanent magnet connected to the fixed iron core; the movable iron core assembly is configured to be magnetized under the electrifying effect of the coil assembly to be attracted to or disconnected from the fixed iron core assembly and to be kept in an attracted or disconnected stable state under the effect of the permanent magnet, and the size of the fixed iron core is far smaller than that of the permanent magnet. The direction of the magnetic field generated by the permanent magnet is the same as that of the magnetic field of the fixed iron core assembly, the magnetic field generated when the coil assembly is connected with breaking current is defined as a first magnetic field, the magnetic field of the fixed iron core assembly is defined as a second magnetic field, and the directions of the first magnetic field and the second magnetic field are opposite; therefore, repulsive force is formed between the movable iron core assembly and the fixed iron core assembly, so that the movable iron core assembly acts quickly, and the corresponding speed of the relay is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of switch electrical appliances, in particular to a magnetic holding electromagnetic system and a relay. Background Art

[0002] Existing magnetic latching relays usually use permanent magnets to form a closed magnetic circuit between the moving iron core and the fixed iron core to maintain the attraction of the moving iron core and the fixed iron core when the coil is de-energized, and switch from the attracted state to the disconnected state by supplying reverse power to the coil or using an auxiliary coil. In order to increase the attraction force when the moving iron core and the fixed iron core switch from disconnection to closure, permanent magnets are usually set at the moving iron core or the fixed iron core to magnetize the moving iron core or the fixed iron core, and then combined with the magnetic attraction force generated by the coil to increase the attraction force. However, the existing magnetic latching electromagnetic system has little effect on improving the attraction force, and due to the single magnetic flux path, the magnetic attraction force generated by the permanent magnet will have an adverse effect on the disconnection of the moving iron core and the fixed iron core. Summary of the invention

[0003] The utility model aims to provide a magnetic holding electromagnetic system and a relay, wherein the magnetic flux path of the magnetic field circuit changes with the distance between the moving iron core and the fixed iron core, which promotes the disconnection and attraction of the moving iron core and the fixed iron core, thereby improving the response speed of the relay.

[0004] To achieve the above-mentioned purpose, the technical solution of the utility model includes: a magnetic holding electromagnetic system, including a fixed iron core assembly, a moving iron core assembly and a coil assembly, the fixed iron core assembly includes a fixed iron core and a permanent magnet connected to the fixed iron core, the moving iron core assembly is configured to be magnetized under the action of the power supply of the coil assembly and to be attracted or disconnected with the fixed iron core assembly and to be maintained in a steady state of attraction or disconnection under the action of the permanent magnet, the volume of the fixed iron core is much smaller than the volume of the permanent magnet, so that the direction of the magnetic field generated by the permanent magnet is the same as the direction of the magnetic field of the fixed iron core assembly, the magnetic field generated when the coil assembly is connected and disconnected The current is defined as a first magnetic field, and the magnetic field of the fixed iron core assembly is defined as a second magnetic field. The directions of the first magnetic field and the second magnetic field are opposite, thereby forming a repulsive force between the moving iron core assembly and the fixed iron core assembly.

[0005] In one embodiment, the permanent magnet is located at an end of the coil assembly and at least a portion of the permanent magnet protrudes from the coil assembly, thereby preventing the magnetic field generated by the permanent magnet from being completely offset by the first magnetic field.

[0006] In one embodiment, a magnetic conductive component is further included, wherein the magnetic conductive component includes a yoke, the yoke is connected with a magnetic conductive part, the magnetic conductive part is arranged at an end of the permanent magnet away from the fixed iron core, and the disconnection distance between the fixed iron core component and the moving iron core component is greater than the distance between the magnetic conductive part and the fixed iron core, so that when the moving iron core component and the fixed iron core component are disconnected in a steady state, the magnetic lines of force emitted by the permanent magnet form a closed loop between the fixed iron core component and the magnetic conductive component to reduce the magnetic attraction of the fixed iron core component to the moving iron core component.

[0007] In one embodiment, the magnetic conductive portion is a magnetic conductive plate arranged on the side of the permanent magnet, and the magnetic conductive plate abuts the yoke, the permanent magnet includes a first end close to the moving iron core assembly and a second end away from the moving iron core assembly, the fixed iron core is arranged at the first end of the permanent magnet, and the coil assembly includes a coil frame for winding the coil, the magnetic conductive portion and the coil frame are both arranged around the outer periphery of the permanent magnet, and the end face of the coil frame abuts against the magnetic conductive portion, so that the permanent magnet is located at the end of the coil assembly and a portion of the permanent magnet is located inside the coil assembly.

[0008] In one embodiment, when the coil assembly is connected to or disconnects current, the magnetic lines of force emitted by the magnetized moving iron core assembly extend through the coil frame to the magnetic conductive portion, and a closed magnetic circuit is formed with the aid of the magnetic conductive assembly, so that a repulsive force is formed between the moving iron core assembly and the fixed iron core assembly.

[0009] In one embodiment, the end face of the permanent magnet located at the first end is the first end face, and the first end face of the permanent magnet abuts against the fixed iron core.

[0010] In one embodiment, the end face of the permanent magnet located at the second end is the second end face, the second end face of the permanent magnet protrudes from the coil frame and abuts against the yoke, the inner diameter of the end of the coil frame is larger than the inner diameter of the middle of the coil frame, thereby forming a step on the inner side of the coil frame, and the fixed iron core abuts against the step, so that the coil frame, the yoke and the magnetic conductive part connected thereto cooperate to form a limit for the fixed iron core assembly.

[0011] In one embodiment, the fixed iron core is a thin sheet structure.

[0012] In one embodiment, the movable iron core assembly is fixedly connected to a movable rod, the movable rod is connected to a movable contact to drive the movable contact to move, and the movable rod is made of a lightweight material.

[0013] The technical solution of the utility model also includes: a relay, comprising the above-mentioned magnetic holding electromagnetic system.

[0014] The beneficial effects of the utility model are:

[0015] 1. The utility model sets the volume of the fixed iron core to be much smaller than the volume of the permanent magnet. No matter what the direction of the magnetic field generated by the coil assembly after being energized is, the effect of the magnetic field direction on the fixed iron core is much smaller than the effect of the permanent magnet on the fixed iron core. Therefore, when the coil assembly is connected to the disconnecting current (that is, the coil assembly is energized to disconnect the moving iron core assembly from the fixed iron core assembly), the magnetizing effect of the coil assembly on the fixed iron core is offset by the magnetizing effect of the permanent magnet on the fixed iron core, thereby forming a repulsive force between the moving iron core assembly and the fixed iron core assembly, which helps the moving iron core assembly to move quickly and improves the response speed of the relay.

[0016] 2. Placing the permanent magnet at the end of the coil assembly can effectively reduce the effect of the magnetic field generated by the coil assembly when it is energized on the permanent magnet, thereby reducing the magnetic field offsetting effect of the first magnetic field on the permanent magnet, avoiding the second magnetic field from being completely offset, and ensuring that there is a repulsive force between the moving iron core assembly and the fixed iron core assembly.

[0017] 3. The instantaneous impact force when the moving iron core assembly and the fixed iron core assembly are attracted is relatively large. The fixed iron core is arranged on the first end surface of the permanent magnet to form a buffer for the permanent magnet, effectively preventing the permanent magnet from being broken due to the impact force.

[0018] 4. The existence of the magnetic conductive part enables most of the magnetic lines of force emitted by the permanent magnet to avoid the moving iron core assembly and close between the fixed iron core assembly and part of the magnetic conductive assembly, thereby reducing the magnetic attraction of the permanent magnet to the moving iron core assembly in the disconnection steady state and improving the disconnection stability and the reliability of the relay operation.

[0019] 5. Since the second magnetic field is in a different direction from the first magnetic field, the magnetic lines of force emitted by the moving iron core assembly under the magnetization of the first magnetic field are difficult to pass through the interior of the fixed iron core assembly. Placing the magnetic conductive part against the coil frame can reduce the distance between the moving iron core assembly and the magnetic conductive part and the magnetic resistance between the two, so that the magnetic lines of force emitted by the moving iron core assembly can extend in the direction of the magnetic conductive part, further ensuring the repulsive force between the moving iron core assembly and the fixed iron core assembly.

[0020] 6. The magnetic conductive part and the coil frame are arranged around the outer periphery of the permanent magnet, so that the first end of the permanent magnet extends into the coil frame, and the second end of the permanent magnet abuts against the yoke, so that the magnetic lines of force emitted by the permanent magnet can be closed through the magnetic conductive component including the yoke and the moving iron core component, which can reduce the leakage of the magnetic lines of force and ensure the magnetic force between the various components of the electromagnetic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front view of the embodiment 1 of the utility model in the attracted steady state.

[0022] Figure 2 It is a left view of the embodiment 1 of the utility model in the attracted steady state.

[0023] Figure 3 yes Figure 1 AA section view.

[0024] Figure 4 yes Figure 2 BB cross-sectional view.

[0025] Figure 5 yes Figure 3 A cross-sectional view of the utility model embodiment 1 in a severed steady state from a viewing angle.

[0026] Figure 6 It is a front view of the energized steady state of embodiment 2 of the utility model.

[0027] Figure 7 yes Figure 6 CC cross-sectional view.

[0028] Among them: 1 fixed iron core assembly, 11 fixed iron core, 12 permanent magnet, 2 moving iron core assembly, 3 coil assembly, 31 coil frame, 311 step, 32 first coil, 33 second coil, 4 movable rod, 5 moving spring, 51 moving contact, 61 yoke, 62 magnetic circuit pressure plate, 63 magnetic conductive cylinder, 64 magnetic conductive part, 7 spring, 81 auxiliary moving contact, 82 auxiliary static contact, 9 push card. DETAILED DESCRIPTION

[0029] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0030] Example 1

[0031] See also Figures 1 to 5 As shown, the utility model discloses a magnetic holding electromagnetic system, including a fixed iron core assembly 1, a moving iron core assembly 2 and a coil assembly 3. The fixed iron core assembly 1 includes a fixed iron core 11 and a permanent magnet 12 connected to the fixed iron core 11. The permanent magnet 12 includes a first end close to the moving iron core assembly 2 and a second end away from the moving iron core assembly 2. The moving iron core assembly 2 is configured to be magnetized under the action of the coil assembly 3 to be attracted or disconnected with the fixed iron core assembly 1 and to be maintained in a steady state of attraction or disconnection under the action of the permanent magnet 12. The moving iron core assembly 2 is a moving part made of pure iron. The moving iron core assembly 2 is fixedly connected to a movable rod 4. The end of the movable rod 4 is connected to a moving spring 5, and the moving spring 5 is provided with a moving contact 51, thereby forming a connection between the movable rod 4 and the moving contact 51. The movement of the moving iron core assembly 2 drives the movable rod 4 and the moving contact 51 to move.

[0032] The coil assembly 3 includes a coil frame 31 and a first coil 32 and a second coil 33 wound outside the coil frame 31. The first coil 32 and the second coil 33 are respectively energized to generate a magnetic field to magnetize the moving iron core assembly 2 and attract or disconnect it from the fixed iron core assembly 1. One of the first coil 32 and the second coil 33 is used to drive the moving iron core assembly 2 to attract with the fixed iron core assembly 1, and the other is used to drive the moving iron core assembly 2 to disconnect with the fixed iron core assembly 1. This example is explained by taking the example that the first coil 32 is used to drive the moving iron core assembly 2 to attract with the fixed iron core assembly 1, and the second coil 33 is used to drive the moving iron core assembly 2 to disconnect with the fixed iron core assembly 1; of course, in other embodiments, it is also feasible that the first coil 32 is used to drive the moving iron core assembly 2 to disconnect with the fixed iron core assembly 1, and the second coil 33 is used to drive the moving iron core assembly 2 to disconnect with the fixed iron core assembly 1.

[0033] The current direction when the first coil 32 is energized is defined as a pull-in current, and the current direction when the second coil 33 is energized is defined as a break current.

[0034] The volume of the fixed iron core 11 is much smaller than the volume of the permanent magnet 12. No matter what the direction of the magnetic field generated by the coil assembly 3 after being energized is, the effect on the direction of the magnetic field of the fixed iron core 11 is much smaller than the effect of the permanent magnet 12 on the direction of the magnetic field of the fixed iron core 11, so that the direction of the magnetic field generated by the permanent magnet 12 is the same as the direction of the magnetic field of the fixed iron core assembly 1, that is, the direction of the magnetic field of the fixed iron core assembly 1 remains unchanged. The magnetic field generated when the coil assembly 3 is connected and disconnected is defined as the first magnetic field, and the magnetic field of the fixed iron core assembly 1 is defined as the second magnetic field. The first magnetic field is opposite to the second magnetic field, so that when the coil assembly 3 is connected and disconnected, the first magnetic field and the second magnetic field form a repulsive force between the moving iron core assembly 2 and the fixed iron core assembly 1, and the repulsive force can help the moving iron core assembly 2 and the fixed iron core assembly 1 to disconnect, thereby improving the response speed of the relay, and has a good promoting effect on the arc extinguishing of the relay, especially the arc extinguishing of the high-voltage relay.

[0035] Since the directions of the first magnetic field and the second magnetic field are opposite, the first magnetic field will inevitably produce a certain offsetting effect on the permanent magnet 12. In order to avoid the first magnetic field from excessively offsetting the magnetic field generated by the permanent magnet 12, thereby reducing the repulsive force between the moving iron core assembly 2 and the fixed iron core assembly 1, the permanent magnet 12 should be set at a position far away from the coil assembly 3. However, if the permanent magnet 12 is set too far away, and the fixed iron core 11 is connected to the permanent magnet 12, the fixed iron core assembly 1 will be too far away from the moving iron core assembly 2, which is not conducive to the attraction between the fixed iron core assembly 1 and the moving iron core assembly 2. On the other hand, it will also increase the volume of the electromagnetic system, thereby increasing the volume of the relay, which is not conducive to the miniaturization of the product. In this example, the permanent magnet 12 is set at the end of the coil assembly 3 and at least a part of the permanent magnet 12 protrudes from the coil assembly 3, thereby preventing the magnetic field generated by the permanent magnet 12 from being completely offset by the first magnetic field, ensuring the size of the magnetic field repulsive force, and taking into account the distance between the fixed iron core assembly 1 and the moving iron core assembly 2.

[0036] See also Figures 1 to 5 As shown, it also includes a magnetic conductive component, which is used to assist the magnetic field generated by the energized coil component 3 and the magnetic field generated by the permanent magnet to form a closed magnetic circuit. The magnetic conductive component includes a yoke 61, a magnetic circuit pressure plate 62 and a magnetic conductive cylinder 63, so that when the fixed iron core component 1 and the moving iron core component 2 are attracted, a magnetic line of force circuit of the fixed iron core component 1-yoke 61-magnetic circuit pressure plate 62-magnetic conductive cylinder 63-moving iron core component 2-fixed iron core component 1 can be formed, so that the fixed iron core component 1 and the moving iron core component 2 are maintained in an attracted steady state, thereby improving the reliability of the relay. In this example, each magnetic line of force circuit is described with the first end of the permanent magnet 12 being S-level and the second end being N-level. In other embodiments, it is also feasible that the first end of the permanent magnet 12 is N-level and the second end is S-level. When the polarity of the permanent magnet 12 is opposite, the magnetic line of force circuits are also opposite accordingly. A spring 7 is provided between the fixed core assembly 1 and the moving core assembly 2. When the fixed core assembly 1 and the moving core assembly 2 are attracted, the spring 7 is compressed, and the magnetic attraction between the fixed core assembly 1 and the moving core assembly 2 can overcome the elastic force of the spring and maintain the attracted steady state. The stronger the magnetic field of the permanent magnet 12, the more stable the closure between the fixed core assembly 1 and the moving core assembly 2. The spring 7 between the fixed core assembly 1 and the moving core assembly 2 can also form a breaking force in combination with the first magnetic field, and maintain the stability between the fixed core assembly 1 and the moving core assembly 2 in the breaking steady state. When the fixed core assembly 1 and the moving core assembly 2 are switched from attraction to disconnection, the repulsive force formed between the moving core assembly 2 and the fixed core assembly 1 by the first magnetic field and the second magnetic field and the elastic force of the spring 7 can make the breaking speed of the moving core assembly 2 and the fixed core assembly 1 faster, thereby further improving the response speed of the relay.

[0037] In order to maintain the distance between the moving iron core assembly 2 and the fixed iron core assembly 1 in the disconnected steady state, the prior art relies on the elastic force of the spring 7 being greater than the magnetic attraction between the moving iron core assembly 2 and the fixed iron core assembly 1, which requires increasing the elastic force of the spring 7 or reducing the magnetic attraction between the moving iron core assembly 2 and the fixed iron core assembly 1. Too large an elastic force is not conducive to attraction, and too small a magnetic attraction will reduce the reliability of the attraction steady state, and the magnetic field generated by the permanent magnet may also be offset under the action of the first magnetic field, thereby reducing the response speed of the closing switch to the disconnection. The utility model achieves the purpose of not having the magnetic field generated by the permanent magnet 12 offset by the first magnetic field by setting the volume of the permanent magnet 12 to be much larger than the fixed iron core 11, and maintains the distance between the moving iron core assembly 2 and the fixed iron core assembly 1 by reducing the magnetic attraction between the moving iron core assembly 2 and the fixed iron core assembly 1 in the disconnected steady state. Specifically, the yoke 61 is connected to a magnetic conductive part 64, which is arranged at the end of the permanent magnet 12 away from the fixed core 11, and the disconnection spacing between the fixed core assembly 1 and the moving core assembly 2 is greater than the spacing between the magnetic conductive part 64 and the fixed core 11, so that when the moving core assembly 2 and the fixed core assembly 1 are disconnected in a steady state, the magnetic lines of force emitted by the permanent magnet 12 form a closed magnetic line of force loop between the fixed core assembly 1 and the magnetic conductive part 6 to reduce the magnetic attraction of the fixed core assembly 1 to the moving core assembly 2. Among them, most of the magnetic lines of force emitted by the permanent magnet 12 form a closed magnetic line of force loop through the permanent magnet 12-yoke 61-magnetic conductive part 64-fixed core 11-permanent magnet 12, and only a small part leaks to the moving core assembly 2 to form a magnetic attraction to the moving core assembly 2, but the magnetic attraction generated by the less leakage of this part of the magnetic lines of force is also very small, so it can be ignored.

[0038] From the above analysis, it can be known that: during the disconnection process, the fixed iron core assembly 1 of the utility model can exert a repulsive force between the fixed iron core assembly 1 and the moving iron core assembly 2, and the repulsive force works together with the elastic force of the spring 7 to make the fixed iron core assembly 1 and the moving iron core assembly 2 and increase the disconnection speed; during the attraction process, the magnetic field generated by the coil assembly 3 - the magnetic field is defined as the third magnetic field - is opposite to the direction of the first magnetic field, and the magnetic field direction of the fixed iron core assembly 1 remains unchanged in the direction of the second magnetic field, thereby forming a magnetic attraction between the fixed iron core assembly 1 and the moving iron core assembly 2, and the second magnetic field and the third magnetic field are superimposed to increase the magnetic attraction and increase the attraction speed; therefore, the utility model can increase the response speed of relay disconnection and attraction, and promote the arc extinguishing of the relay when the relay is used for medium and high voltage electricity. In addition, in the disconnected steady state, the magnetic conductive portion 64 makes the magnetic lines of force emitted by the permanent magnet 12 pass through the moving iron core assembly 2 only very rarely, reducing the magnetic attraction between the fixed iron core assembly 1 and the moving iron core assembly 2, thereby improving the reliability of the relay in the disconnected steady state; in the attracted steady state, the larger the volume of the permanent magnet 2, the greater the magnetic attraction between the fixed iron core assembly 1 and the moving iron core assembly 2, thereby improving the reliability of the relay in the attracted steady state.

[0039] In this example, the magnetic conductive portion 64 is a magnetic conductive plate disposed on the side of the permanent magnet 12, and the magnetic conductive plate is in contact with the yoke 61, so the connection between the magnetic conductive portion 64 and the yoke 61 is a split connection, which simplifies the structure of the magnetic conductive plate and the yoke 61 and reduces the manufacturing difficulty. In other embodiments, the magnetic conductive portion 64 can also be integrally formed on the yoke 61, so that the connection between the magnetic conductive portion 64 and the yoke 61 forms an integral connection, reducing the number of parts.

[0040] See also Figures 1 to 5 As shown, the fixed iron core 11 is arranged at the first end of the permanent magnet 12, the magnetic conductive portion 64 and the coil frame 31 are both arranged around the outer peripheral side of the permanent magnet 12, and the end face of the coil frame 31 abuts against the magnetic conductive portion 64, so that the permanent magnet 12 is located at the end of the coil assembly 3 and a part of the permanent magnet 12 is located inside the coil assembly 3.

[0041] When the coil assembly 3 is connected and disconnected from the current, the magnetic lines of force emitted by the magnetization of the moving iron core assembly 2 extend to the magnetic conductive part through the non-magnetic coil frame 31, and form a closed magnetic line of force loop with the help of the magnetic conductive assembly. The magnetic line of force loop is the moving iron core assembly 2-magnetic cylinder 63-magnetic circuit pressure plate 62-yoke 61-magnetic conductive part 64-moving iron core assembly 2, so that the moving iron core assembly 2 and the fixed iron core assembly 1 form a repulsive force. Since the direction of the second magnetic field is different from that of the first magnetic field, the magnetic lines of force emitted by the moving iron core assembly 2 under the magnetization of the first magnetic field are difficult to pass through the inside of the fixed iron core assembly 1. Placing the magnetic conductive part 64 against the coil frame 31 can reduce the distance between the moving iron core assembly 2 and the magnetic conductive part 64 and the magnetic resistance between the two, so that the magnetic lines of force emitted by the moving iron core assembly 2 can extend in the direction of the magnetic conductive part 64, further ensuring the repulsive force between the moving iron core assembly 2 and the fixed iron core assembly 1.

[0042] The end face of the permanent magnet 12 located at the first end is the first end face, and the first end face of the permanent magnet 12 abuts against the fixed iron core 11, thereby forming a fixed iron core assembly. When the moving iron core assembly 2 and the fixed iron core assembly 1 switch from disconnection to attraction, the moving iron core assembly 2 quickly collides with the fixed iron core assembly 1, which will form a large impact force on the fixed iron core assembly 1, and the permanent magnet 21 is generally made of magnetic steel, which is relatively fragile and fragile. If it directly bears the impact force of the moving iron core assembly 2, it may break. The fixed iron core 11 is set on the first end face of the permanent magnet 12, and the fixed iron core 11 is generally made of pure iron, with a large hardness, and is softer than the permanent magnet, which can form a buffer protection for the permanent magnet 12 to prevent the permanent magnet 12 from breaking at the moment when the moving iron core assembly 2 and the fixed iron core assembly 1 are attracted.

[0043] The end face of the permanent magnet 12 at the second end is the second end face. The second end face of the permanent magnet 12 protrudes from the coil frame 31 and abuts against the yoke 61. The inner diameter of the end of the coil frame 31 is larger than the inner diameter of the middle of the coil frame 31, so that a step 311 is formed on the inner side of the coil frame 31. The fixed core 11 abuts against the step 311. The step 311 of the coil frame 31 and the yoke 61 can form a limit on the upper and lower ends (i.e., the axial direction of the fixed core assembly 1) of the fixed core assembly 1. The coil frame 31 and the magnetic conductive part 64 are both arranged around the outer peripheral side of the fixed core assembly 1, so the coil frame 31 and the magnetic conductive part 64 can form a limit in the radial direction of the fixed core assembly 1, so that the coil frame 31, the yoke 61 and the magnetic conductive part 64 connected thereto cooperate to form a limit for the fixed core assembly 1. In addition, the radial space on the inner side of the coil frame bounded by the step 311 is different, and the radial space of the fixed iron core assembly 1 is larger than the radial space of the moving iron core assembly 2. Therefore, the volume of the fixed iron core assembly 1 can be increased through a larger radial space while the axial space (i.e., the up and down direction in the figure) of the coil frame 31 remains unchanged. More specifically, the volume of the permanent magnet 12 is increased to increase the strength of the second magnetic field and the repulsive force between the fixed iron core assembly 1 and the moving iron core assembly 2 during the disconnection process, which helps to shorten the disconnection time and improve the disconnection response speed.

[0044] In this example, the fixed iron core 11 is a thin sheet structure, and the thin sheet structure covers the first end surface of the permanent magnet 12, which can not only protect the permanent magnet 12, but also ensure that the volume of the fixed iron core 11 is small enough to ensure the magnetic field direction of the fixed iron core assembly 1.

[0045] The movable rod 4 connected to the moving iron core assembly 2 is made of lightweight material. Since the movable rod 4 and the movable spring 5 and the moving contact 51 connected thereto move with the movement of the moving iron core assembly 2, the movable rod 4 made of lightweight material can reduce its weight, thereby increasing the movement speed of the moving iron core assembly 2 and improving the response speed of the relay.

[0046] The working states of this embodiment include the pull-in process, pull-in steady state, disconnection process, and disconnection steady state. The specific working states are as follows:

[0047] The attraction process: the process in which the fixed iron core assembly 1 and the moving iron core assembly 2 switch from the disconnected steady state to the attracted steady state. The coil assembly 3 passes the attraction current to generate a third magnetic field, which is in the same direction as the magnetic field generated by the permanent magnet 12. A magnetic attraction force is generated between the fixed iron core assembly 1 and the moving iron core assembly 2. The magnetic attraction force overcomes the elastic force of the spring 7 and drives the moving iron core assembly 2 toward the fixed iron core assembly 1 and is attracted to the fixed iron core assembly 1.

[0048] Closed steady state: see Figure 3 As shown, the fixed iron core assembly 1 and the moving iron core assembly 2 are attracted, the coil assembly 3 is powered off and does not generate any magnetic field, and the magnetic field generated by the permanent magnet 12 attracts the fixed iron core assembly 1 and the moving iron core assembly 2 to maintain the attracted state of the two.

[0049] Disconnection process: In the process of switching the fixed iron core assembly 1 and the moving iron core assembly 2 from the attracted steady state to the disconnected steady state, the coil assembly 3 passes the disconnecting current to generate a first magnetic field, which is opposite to the magnetic field generated by the permanent magnet 12, and a repulsive force is generated between the fixed iron core assembly 1 and the moving iron core assembly 2. The repulsive force and the elastic force of the spring 7 work together to drive the moving iron core assembly 2 to move in a direction away from the fixed iron core assembly 1 and disconnect from the fixed iron core assembly 1.

[0050] Breaking steady state: see Figure 5 As shown, the fixed iron core assembly 1 and the moving iron core assembly 2 are disconnected, the coil assembly 3 is powered off and does not generate any magnetic field, the magnetic field generated by the permanent magnet 12 forms a closed magnetic field line loop between the fixed iron core assembly 1 and the magnetic conductive assembly, and the magnetic attraction between the fixed iron core assembly 1 and the moving iron core assembly 2 is less than the elastic force of the spring 7, maintaining the disconnected state of the two.

[0051] Example 2

[0052] See also Figure 6 and Figure 7 As shown, the utility model also discloses a relay, which is a magnetic latching relay, and includes a magnetic latching electromagnetic system disclosed in Example 1.

[0053] The movable rod 4 is also connected to a push card 9. As the movable rod 4 moves, the push card 9 pushes the auxiliary moving contact 81 and the auxiliary static contact 82 to close or disconnect. The closing or disconnection of the auxiliary moving contact 81 and the auxiliary static contact 82 is used to switch the first coil 32 or the second coil 33 to connect to the power supply, so that the coil assembly 3 forms the first magnetic field or the third magnetic field after being energized.

[0054] In the above embodiment, the coil assembly 3 includes a first coil 32 and a second coil 33, and the two coils are used for closing or disconnecting respectively. In other embodiments, only one coil may be provided, and the direction of the magnetic field generated by the coil assembly 3 is changed by switching the direction of the current in the coil, thereby closing or disconnecting the moving iron core assembly 2 and the fixed iron core assembly 1. The specific structure of the coil assembly 3 and the method for switching the direction of the magnetic field are prior arts in the art and will not be described in detail here.

[0055] Although the present invention is specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that the remaining undescribed portions are prior art, and that various changes made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims shall fall within the scope of protection of the present invention.

Claims

1. A magnetic holding electromagnetic system, comprising a fixed iron core assembly, a moving iron core assembly and a coil assembly, wherein the fixed iron core assembly comprises a fixed iron core and a permanent magnet connected to the fixed iron core, and the moving iron core assembly is configured to be magnetized under the action of the current of the coil assembly and to be attracted or disconnected with the fixed iron core assembly and to be maintained in a steady state of attraction or disconnection under the action of the permanent magnet, characterized in that: The volume of the fixed iron core is much smaller than that of the permanent magnet, so that the direction of the magnetic field generated by the permanent magnet is the same as the direction of the magnetic field of the fixed iron core assembly. The magnetic field generated when the coil assembly is connected and disconnected from the current is defined as the first magnetic field, and the magnetic field of the fixed iron core assembly is defined as the second magnetic field. The directions of the first magnetic field and the second magnetic field are opposite, thereby forming a repulsive force between the moving iron core assembly and the fixed iron core assembly.

2. A magnetic holding electromagnetic system according to claim 1, characterized in that: The permanent magnet is located at an end of the coil assembly and at least a portion of the permanent magnet protrudes from the coil assembly, thereby preventing the magnetic field generated by the permanent magnet from being completely offset by the first magnetic field.

3. A magnetic holding electromagnetic system according to claim 2, characterized in that: It also includes a magnetic conductive component, which includes a yoke, and the yoke is connected with a magnetic conductive part. The magnetic conductive part is arranged at an end of the permanent magnet away from the fixed iron core, and the disconnection distance between the fixed iron core component and the moving iron core component is greater than the distance between the magnetic conductive part and the fixed iron core. Therefore, when the moving iron core component and the fixed iron core component are disconnected in a steady state, the magnetic lines of force emitted by the permanent magnet form a closed loop between the fixed iron core component and the magnetic conductive component to reduce the magnetic attraction of the fixed iron core component to the moving iron core component.

4. A magnetic holding electromagnetic system according to claim 3, characterized in that: The magnetic conductive part is a magnetic conductive plate arranged on the side of the permanent magnet, and the magnetic conductive plate abuts the yoke. The permanent magnet includes a first end close to the moving iron core assembly and a second end away from the moving iron core assembly. The fixed iron core is arranged at the first end of the permanent magnet. The coil assembly includes a coil frame for winding the coil. The magnetic conductive part and the coil frame are both arranged around the outer periphery of the permanent magnet, and the end face of the coil frame abuts against the magnetic conductive part, so that the permanent magnet is located at the end of the coil assembly and a part of the permanent magnet is located inside the coil assembly.

5. A magnetic holding electromagnetic system according to claim 4, characterized in that: When the coil assembly is connected to or disconnects current, the magnetic lines of force emitted by the magnetized moving iron core assembly extend through the coil frame to the magnetic conductive part, and a closed magnetic circuit is formed with the help of the magnetic conductive assembly, so that a repulsive force is formed between the moving iron core assembly and the fixed iron core assembly.

6. A magnetic holding electromagnetic system according to claim 4, characterized in that: The end face of the permanent magnet located at the first end is a first end face, and the first end face of the permanent magnet abuts against the fixed iron core.

7. A magnetic holding electromagnetic system according to claim 6, characterized in that: The end face of the permanent magnet located at the second end is the second end face, the second end face of the permanent magnet protrudes from the coil frame and abuts against the yoke, the inner diameter of the end of the coil frame is larger than the inner diameter of the middle of the coil frame, thereby forming a step on the inner side of the coil frame, and the fixed iron core abuts against the step, so that the coil frame, the yoke and the magnetic conductive part connected thereto cooperate to form a limit for the fixed iron core assembly.

8. A magnetic holding electromagnetic system according to any one of claims 1 to 7, characterized in that: The fixed iron core is a thin sheet structure.

9. A magnetic holding electromagnetic system according to any one of claims 1 to 7, characterized in that: The movable iron core assembly is fixedly connected with a movable rod, the movable rod is connected with a movable contact to drive the movable contact to move, and the movable rod is made of a light material.

10. A relay, characterized in that: A magnetic holding electromagnetic system comprising any one of claims 1-9.

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