Electromagnetic switch and storage box

Abstract

The utility model relates to an electromagnetic switch and storage box, including electromagnet subassembly and permanent magnet subassembly, electromagnet subassembly includes at least two in first direction sequential interval arrangement's magnetic core, wherein two adjacent magnetic core is first magnetic core and second magnetic core, and the first magnetic core and second magnetic core are wound with coil, and permanent magnet subassembly has at least first magnetic pole, second magnetic pole, third magnetic pole and fourth magnetic pole.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic switches, and in particular to an electromagnetic switch and a storage box. Background Technology

[0002] With the continuous development of electric vehicle technology, the degree of electrification in electric vehicles is increasing, and some storage boxes in electric vehicles are also beginning to be electrically controlled. These storage boxes mainly consist of a box body, a lid, and an electromagnetic switch. The electromagnetic switch includes an electromagnet and a permanent magnet; one is mounted on the box body, and the other on the lid. When the electromagnet is not energized, it attracts the permanent magnet, allowing the lid to close stably on the box body. Once the electromagnet is energized, it generates a corresponding magnetic field with the same polarity as the permanent magnet. This causes the electromagnet and permanent magnet to repel each other, allowing the lid to automatically pop open from the box body.

[0003] To achieve the automatic pop-opening of the trolley lid, sufficient repulsive force needs to be generated between the electromagnet and the permanent magnet. Two methods are typically used to increase this repulsive force: increasing the current flowing through the electromagnet or increasing the volume of the permanent magnet. The former not only increases the trolley's power consumption but also poses a safety hazard, while the latter results in the electromagnetic switch occupying too much space inside the trolley when the lid is closed, reducing the trolley's storage capacity. Utility Model Content

[0004] Based on this, in order to solve the problem that electromagnetic switches in the prior art cannot achieve high repulsion while meeting the requirements of safety and miniaturization, this utility model provides an electromagnetic switch and a storage box.

[0005] An electromagnetic switch includes an electromagnet assembly and a permanent magnet assembly;

[0006] The electromagnet assembly includes at least two magnetic cores arranged at intervals in a first direction, wherein two adjacent magnetic cores are a first magnetic core and a second magnetic core, and coils are wound on the first magnetic core and the second magnetic core;

[0007] The permanent magnet assembly has at least a first magnetic pole, a second magnetic pole, a third magnetic pole, and a fourth magnetic pole;

[0008] The first magnetic pole is disposed opposite to the first magnetic core, the third magnetic pole is attached to the side of the first magnetic pole facing away from the first magnetic core, the second magnetic pole is disposed opposite to the second magnetic core, the fourth magnetic pole is attached to the side of the second magnetic pole facing away from the second magnetic core, the edge of the first magnetic pole is attached to the edge of the second magnetic pole, the edge of the third magnetic pole is attached to the edge of the fourth magnetic pole, the first magnetic pole and the fourth magnetic pole have the same polarity, the third magnetic pole and the second magnetic pole have the same polarity, and the first magnetic pole and the second magnetic pole have opposite polarities.

[0009] The electromagnetic switch has an on-state and an off-state. When the electromagnetic switch is in the on-state, the first magnetic core and the first magnetic pole repel each other, and the second magnetic core and the second magnetic pole repel each other. When the electromagnetic switch is in the off-state, the first magnetic core and the first magnetic pole attract each other, and the second magnetic core and the second magnetic pole attract each other.

[0010] In one embodiment, the electromagnetic switch further includes a magnetic plate, wherein the side of the third magnetic pole facing away from the first magnetic pole and the side of the fourth magnetic pole facing away from the second magnetic pole are attached to the magnetic plate.

[0011] In one embodiment, the electromagnet assembly includes a magnetic block, with the first magnetic core and the second magnetic core fixed to the magnetic block.

[0012] A storage box includes a box body, a cover that fits over the box body, and an electromagnetic switch, wherein one of the electromagnet assembly and the permanent magnet assembly is mounted on the box body and the other is mounted on the cover.

[0013] In one embodiment, the magnetic core and the permanent magnet assembly are spaced apart with a spacing between 0.1 mm and 6 mm.

[0014] An electromagnetic switch includes an electromagnet assembly and a permanent magnet assembly;

[0015] The electromagnet assembly includes a magnetic block and at least three magnetic cores that are fixedly spaced apart on the magnetic block in a first direction. The three magnetic cores that are sequentially adjacent to each other are a first magnetic core, a second magnetic core, and a third magnetic core. The first magnetic core and the third magnetic core are wound with coils, while the second magnetic core is not wound with a coil.

[0016] The permanent magnet assembly has at least a first magnetic pole, a second magnetic pole, a third magnetic pole, a fourth magnetic pole, a fifth magnetic pole, and a sixth magnetic pole;

[0017] The first magnetic pole is disposed opposite to the first magnetic core. The third magnetic pole is attached to the side of the first magnetic pole facing away from the first magnetic core. The second magnetic pole is disposed opposite to the second magnetic core. The fourth magnetic pole is attached to the side of the second magnetic pole facing away from the second magnetic core. The third magnetic core and the fifth magnetic pole are disposed opposite to each other. The sixth magnetic pole is attached to the side of the fifth magnetic pole facing away from the third magnetic core. The first magnetic pole and the fifth magnetic pole are respectively located on both sides of the second magnetic pole in a first direction, and the edges of the first magnetic pole and the fifth magnetic pole are respectively attached to the two side edges of the second magnetic pole. The third magnetic pole and the sixth magnetic pole are respectively located on both sides of the fourth magnetic pole in a first direction, and the edges of the third magnetic pole and the sixth magnetic pole are respectively attached to the two side edges of the fourth magnetic pole. The first magnetic pole, the fourth magnetic pole, and the fifth magnetic pole have the same polarity. The second magnetic pole, the third magnetic pole, and the sixth magnetic pole have the same polarity. The first magnetic pole and the second magnetic pole have opposite polarities.

[0018] The electromagnetic switch has an on-state and an off-state. When the electromagnetic switch is in the on-state, the first magnetic core and the first magnetic pole repel each other, the third magnetic core and the fifth magnetic pole repel each other, and the second magnetic core obtains the same polarity as the second magnetic pole through the first magnetic core, the third magnetic core and the magnetic guide block, so as to repel the second magnetic pole. When the electromagnetic switch is in the off-state, the first magnetic core and the first magnetic pole attract each other, the second magnetic core and the second magnetic pole attract each other, and the third magnetic core and the fifth magnetic pole attract each other.

[0019] In one embodiment, the electromagnetic switch further includes a magnetic plate, wherein the side of the third magnetic pole facing away from the first magnetic pole, the side of the fourth magnetic pole facing away from the second magnetic pole, and the side of the sixth magnetic pole facing away from the fifth magnetic pole are attached to the magnetic plate.

[0020] In one embodiment, the permanent magnet assembly is a single-piece structure obtained by multi-pole magnetization, or the permanent magnet assembly is obtained by splicing together multiple permanent magnets.

[0021] A storage box includes a box body, a cover that fits over the box body, and an electromagnetic switch, wherein one of the electromagnet assembly and the permanent magnet assembly is mounted on the box body and the other is mounted on the cover.

[0022] In one embodiment, the magnetic core and the permanent magnet assembly are spaced apart with a spacing between 0.1 mm and 6 mm.

[0023] When the electromagnetic switch of this utility model is in the power-off state, it can enhance the magnetic attraction between the permanent magnet component and the electromagnet component without increasing the volume of the permanent magnet component, thereby making the cover more stably close to the box. The fact that the volume of the permanent magnet component does not need to be increased means that the cost of the permanent magnet component is controlled, and at the same time, the permanent magnet component will not further occupy the storage space in the box.

[0024] When the electromagnetic switch of this utility model is energized, it can enhance the repulsive force between the permanent magnet assembly and the electromagnet assembly without increasing the volume of the permanent magnet assembly, the number of coil turns on the electromagnet assembly, or the current in the coil. This makes it easier to open the cover from the box. The fact that the volume of the permanent magnet assembly and the number of coil turns are not increased means that the overall cost of the electromagnetic switch is controlled, and the fact that the current in the coil is not increased means that the safety risks are controlled.

[0025] In summary, the electromagnetic switch of this utility model, while simultaneously meeting the requirements of safety and miniaturization, can further meet the requirement of high magnetic attraction when in the power-off state and the requirement of high repulsion when in the power-on state. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of the electromagnetic switch in Embodiment 1 of this utility model;

[0027] Figure 2 This is a three-dimensional structural diagram of the electromagnet assembly in Embodiment 1 of this utility model;

[0028] Figure 3 This is a three-dimensional structural diagram of the coil support in Embodiment 1 of this utility model;

[0029] Figure 4 This is a three-dimensional structural diagram of the permanent magnet assembly in Embodiment 1 of this utility model;

[0030] Figure 5 This is a schematic diagram of the main structure of the permanent magnet assembly in Embodiment 1 of this utility model;

[0031] Figure 6 This is a schematic diagram of the main structure of the electromagnetic switch in Embodiment 1 of this utility model;

[0032] Figure 7 This is a simulation diagram of the magnetic field distribution when the electromagnetic switch is in the de-energized state in Embodiment 1 of this utility model;

[0033] Figure 8 This is a simulation diagram of the magnetic field distribution when the electromagnetic switch is energized in Embodiment 1 of this utility model;

[0034] Figure 9This is a schematic diagram of the main structure of the electromagnetic switch in Comparative Embodiment 1 of this utility model;

[0035] Figure 10 This is a simulation diagram of the magnetic field distribution when the electromagnetic switch is in the de-energized state in Comparative Embodiment 1 of this utility model;

[0036] Figure 11 This is a simulation diagram of the magnetic field distribution of the electromagnetic switch in the energized state in Comparative Embodiment 1 of this utility model;

[0037] Figure 12 This is a three-dimensional structural diagram of the electromagnetic switch in Embodiment 2 of this utility model;

[0038] Figure 13 This is a three-dimensional structural diagram of the permanent magnet assembly in Embodiment 2 of this utility model;

[0039] Figure 14 This is a schematic diagram of the main structure of the permanent magnet assembly in Embodiment 2 of this utility model;

[0040] Figure 15 This is a schematic diagram of the main structure of the electromagnetic switch in Embodiment 2 of this utility model;

[0041] Figure 16 This is a simulation diagram of the magnetic field distribution when the electromagnetic switch is in the de-energized state in Embodiment 2 of this utility model;

[0042] Figure 17 This is a simulation diagram of the magnetic field distribution when the electromagnetic switch is energized in Embodiment 2 of this utility model;

[0043] Figure 18 This is a schematic diagram of the main structure of the electromagnetic switch in Comparative Embodiment 3 of this utility model;

[0044] Figure 19 This is a simulation diagram of the magnetic field distribution when the electromagnetic switch is in the de-energized state in Comparative Embodiment 3 of this utility model;

[0045] Figure 20 This is a simulation diagram of the magnetic field distribution when the electromagnetic switch is energized in Comparative Embodiment 3 of this utility model.

[0046] Figure label:

[0047] 1. Electromagnet assembly; 11. First magnetic core; 12. Second magnetic core; 13. Third magnetic core; 14. Magnetic guide block; 15. Coil support; 2. Permanent magnet assembly; 21. First magnetic pole; 22. Second magnetic pole; 23. Third magnetic pole; 24. Fourth magnetic pole; 25. Fifth magnetic pole; 26. Sixth magnetic pole; 3. Magnetic guide plate. Detailed Implementation

[0048] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0049] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0051] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0052] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0053] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0054] Example 1:

[0055] This embodiment provides a storage box, including a box body, a lid that covers the box body, and an electromagnetic switch. The electromagnetic switch includes an electromagnet assembly 1 and a permanent magnet assembly 2. One of the electromagnet assembly 1 and the permanent magnet assembly 2 is mounted on the box body, and the other is mounted on the lid.

[0056] The electromagnetic switch has an on-state and an off-state. When the electromagnetic switch is in the on-state, the electromagnet component 1 generates a magnetic field, which repels the permanent magnet component 2, thereby causing the cover to spring open on the box. When the electromagnetic switch is in the off-state, the electromagnet component 1 does not generate a corresponding magnetic field. The electromagnet component 1 is simply a magnetically attractable metal. The electromagnet component 1 and the permanent magnet component 2 attract each other, and the cover can be stably closed on the box.

[0057] The electromagnet assembly 1 includes at least two magnetic cores arranged sequentially at intervals in a first direction, wherein two adjacent magnetic cores are a first magnetic core 11 and a second magnetic core 12. Specifically, as follows... Figures 1-3 As shown, the electromagnet assembly 1 in this embodiment includes only a first magnetic core 11 and a second magnetic core 12. A coil support 15 is sleeved on the first magnetic core 11 and the second magnetic core 12, and a coil (not shown in the figure) is wound on the coil support 15. In other words, in this embodiment, both the first magnetic core 11 and the second magnetic core 12 are wound with coils, and the total number of turns of the coils on the first magnetic core 11 and the second magnetic core 12 is 400, with each of the first magnetic core 11 and the second magnetic core 12 having 200 turns of coil wound on it.

[0058] In this embodiment, the first magnetic core 11 and the second magnetic core 12 are cuboids with dimensions of 8mm × 15mm × 13mm, where 8mm is the length in the first direction and 13mm is the height in the second direction.

[0059] In this embodiment, the permanent magnet assembly 2 is rectangular in shape, with dimensions of 30mm × 15mm × 2mm, where 30mm is the length in the first direction and 2mm is the thickness in the second direction. The permanent magnet assembly 2 has at least a first magnetic pole 21, a second magnetic pole 22, a third magnetic pole 23, and a fourth magnetic pole 24. For example... Figure 4 and Figure 5 As shown, the permanent magnet assembly 2 in this embodiment has only a first magnetic pole 21, a second magnetic pole 22, a third magnetic pole 23 and a fourth magnetic pole 24. The first magnetic pole 21, the second magnetic pole 22, the third magnetic pole 23 and the fourth magnetic pole 24 are all cuboids and have completely identical dimensions.

[0060] The permanent magnet assembly 2 can be a single structure obtained through multi-pole magnetization, or it can be obtained by splicing together multiple permanent magnets. Both methods can give the permanent magnet assembly 2 a first magnetic pole 21, a second magnetic pole 22, a third magnetic pole 23, and a fourth magnetic pole 24.

[0061] Specifically, such as Figure 6 As shown, the first magnetic pole 21 and the first magnetic core 11 are arranged opposite each other in the second direction, the second magnetic pole 22 and the second magnetic core 12 are arranged opposite each other in the second direction, the third magnetic pole 23 is attached to the side of the first magnetic pole 21 that is away from the first magnetic core 11, and the fourth magnetic pole 24 is attached to the side of the second magnetic pole 22 that is away from the second magnetic core 12. The edge of the first magnetic pole 21 is attached to the edge of the second magnetic pole 22, and the edge of the third magnetic pole 23 is attached to the edge of the fourth magnetic pole 24. The first magnetic pole 21 and the fourth magnetic pole 24 have the same polarity, the third magnetic pole 23 and the second magnetic pole 22 have the same polarity, and the first magnetic pole 21 and the second magnetic pole 22 have opposite polarities.

[0062] For example, in this embodiment, the first magnetic pole 21 and the fourth magnetic pole 24 are both N poles, and the third magnetic pole 23 and the second magnetic pole 22 are both S poles.

[0063] When the electromagnetic switch is in the de-energized state, the coils on the first magnetic core 11 and the second magnetic core 12 are not energized, and no corresponding magnetic field is generated inside the first magnetic core 11 and the second magnetic core 12. The first magnetic core 11 and the second magnetic core 12 are only magnetically attracted metals. Therefore, the first magnetic core 11 and the first magnetic pole 21 can attract each other, and the second magnetic core 12 and the second magnetic pole 22 can attract each other, thereby realizing the attraction between the electromagnet assembly 1 and the permanent magnet assembly 2.

[0064] When the electromagnetic switch is energized, the coils on the first magnetic core 11 and the second magnetic core 12 are energized. The first magnetic core 11 forms an N-pole magnetic field identical to the first magnetic pole 21, and the second magnetic core 12 forms an S-pole magnetic field identical to the second magnetic pole 22. Thus, the first magnetic core 11 and the first magnetic pole 21 repel each other, and the second magnetic core 12 and the second magnetic pole 22 repel each other, so that the electromagnet assembly 1 and the permanent magnet assembly 2 can be separated from each other.

[0065] Preferably, in this embodiment, the electromagnetic switch further includes a magnetic plate 3, with the side of the third magnetic pole 23 facing away from the first magnetic pole 21 and the side of the fourth magnetic pole 24 facing away from the second magnetic pole 22 attached to the magnetic plate 3. The magnetic plate 3 can increase the magnetism of the permanent magnet assembly 2. In this embodiment, the magnetic plate 3 is rectangular in shape, with dimensions of 30mm × 15mm × 1.5mm, where 30mm is the length in the first direction and 2mm is the thickness in the second direction. The magnetic plate 3 can be, for example, an iron plate.

[0066] In this embodiment, the first direction is parallel to the magnetic plate 3, and the second direction is perpendicular to the magnetic plate 3.

[0067] Preferably, the electromagnet assembly 1 in this embodiment further includes a magnetically conductive block 14, on which the first magnetic core 11 and the second magnetic core 12 are fixed. When the electromagnetic switch is energized, the magnetic fields in the first magnetic core 11 and the second magnetic core 12 can be conducted to each other through the magnetically conductive block 14, thereby generating a coupling effect. This strengthens both the magnetic fields in the first magnetic core 11 and the second magnetic core 12, thereby increasing the repulsive force between the electromagnet assembly 1 and the permanent magnet assembly 2.

[0068] In this embodiment, the magnetic block 14 is a cuboid with dimensions of 30mm × 15mm × 3mm, where 30mm is the length in the first direction and 3mm is the thickness in the second direction.

[0069] Typically, the magnetic core and permanent magnet assembly 2 are spaced apart with a spacing between 0.1 mm and 6 mm. For example, the spacing between the first magnetic core 11 and the first magnetic pole 21 in the second direction is equal to the spacing between the second magnetic core 12 and the second magnetic pole 22 in the second direction, both being d, where d is between 0.1 mm and 6 mm.

[0070] This embodiment presents numerical simulations of the magnetic attraction between electromagnet assembly 1 and permanent magnet assembly 2 when the electromagnetic switch is in the de-energized state, and the repulsive force between electromagnet assembly 1 and permanent magnet assembly 2 at the instant when an 8A current is applied to the coil. The numerical simulation results are shown in Table 1.

[0071] Table 1

[0072]

[0073] When d=6mm and the electromagnetic switch is in the off state, the magnetic field distribution diagram inside the electromagnetic switch is as follows: Figure 7 As shown; when d=6mm and an 8A current is applied to the coil, the magnetic field distribution inside the electromagnetic switch is as follows. Figure 8 As shown.

[0074] Comparative Example 1:

[0075] like Figure 9 As shown, the difference between this comparative embodiment 1 and embodiment 1 is that the permanent magnet assembly 2 only has a first magnetic pole 21 and a third magnetic pole 23, and the first magnetic pole 21 and the third magnetic pole 23 have completely identical shapes and dimensions. The first magnetic pole 21 is the N pole, and the third magnetic pole 23 is the S pole, and the first magnetic pole 21 and the third magnetic pole 23 are arranged sequentially in the second direction. The first magnetic core 11 and the second magnetic core 12 are both arranged opposite to the first magnetic pole 21 in the second direction.

[0076] Furthermore, the permanent magnet assembly 2 of Comparative Embodiment 1 and the permanent magnet assembly 2 of Embodiment 1 have completely identical shapes, both being 30mm × 15mm × 2mm. The first magnetic core 11 and the second magnetic core 12 each have 200 turns of coil wound around them.

[0077] In this comparative embodiment 1, numerical simulations were performed on the magnetic attraction between electromagnet assembly 1 and permanent magnet assembly 2 when the electromagnetic switch is in the de-energized state, and the repulsive force between electromagnet assembly 1 and permanent magnet assembly 2 at the instant when an 8A current is applied to the coil. The numerical simulation results are shown in Table 2.

[0078] Table 2

[0079]

[0080] When d=6mm and the electromagnetic switch is in the off state, the magnetic field distribution diagram inside the electromagnetic switch is as follows: Figure 10 As shown; when d=6mm and an 8A current is applied to the coil, the magnetic field distribution inside the electromagnetic switch is as follows. Figure 11 As shown.

[0081] Comparing Tables 1 and 2, taking the case of d=6mm as an example, compared with Comparative Example 1, the magnetic attraction force of Example 1 increased from 4N to 7.8N, an increase of about 1 time, while the repulsion force increased from 1.5N to 4.5N, an increase of about 2 times.

[0082] Comparative Example 2:

[0083] The difference between Comparative Example 2 and Comparative Example 1 is that the thickness of the permanent magnet assembly 2 is increased to 6mm, the total number of turns of the coil wound on the first magnetic core 11 and the second magnetic core 12 is increased to 946, and the number of turns of the coil on the first magnetic core 11 and the second magnetic core 12 is the same.

[0084] Comparative Example 2 conducted numerical simulations on the magnetic attraction between electromagnet assembly 1 and permanent magnet assembly 2 when the electromagnetic switch is in the de-energized state, and the repulsive force between electromagnet assembly 1 and permanent magnet assembly 2 at the instant when an 8A current is applied to the coil. The numerical simulation results are shown in Table 3.

[0085] Table 3

[0086]

[0087] A comparison of Tables 1 and 3 reveals that increasing the thickness of the permanent magnet assembly 2 from 2 mm to 6 mm (a doubling of its volume) and simultaneously increasing the total number of coil turns from 400 to 946 (a 136.5% increase) are necessary to achieve the same magnetic attraction and repulsion forces in the electromagnetic switch of Comparative Example 2 as in Example 1. Furthermore, the increased number of coil turns in Comparative Example 2 also leads to increased resistance; therefore, a higher voltage is required in Comparative Example 2 to maintain the same current in the coil as in Example 1.

[0088] By comprehensively comparing Embodiment 1, Comparative Embodiment 1, and Comparative Embodiment 2, it can be found that the electromagnetic switch in Embodiment 1 has at least the following advantages: When the electromagnetic switch is in the de-energized state, the magnetic attraction between the permanent magnet assembly 2 and the electromagnet assembly 1 can be increased without increasing the volume of the permanent magnet assembly 2, thereby making the cover more stably close to the box. Without increasing the volume of the permanent magnet assembly 2, the cost of the permanent magnet assembly 2 is controlled, and the permanent magnet assembly 2 will not further occupy the storage space in the box. When the electromagnetic switch is in the energized state, the repulsive force between the permanent magnet assembly 2 and the electromagnet assembly 1 can be increased without increasing the volume of the permanent magnet assembly 2, the number of coil turns on the electromagnet assembly 1, or the current in the coil, thereby making the cover easier to open from the box. Without increasing the volume of the permanent magnet assembly 2 and the number of coil turns, the overall cost of the electromagnetic switch is controlled, and without increasing the current in the coil, the safety risk is controlled.

[0089] Example 2:

[0090] This embodiment provides a storage box, including a box body, a lid that covers the box body, and an electromagnetic switch. The electromagnetic switch includes an electromagnet assembly 1 and a permanent magnet assembly 2. One of the electromagnet assembly 1 and the permanent magnet assembly 2 is mounted on the box body, and the other is mounted on the lid.

[0091] The electromagnetic switch has an on-state and an off-state. When the electromagnetic switch is in the on-state, the electromagnet component 1 generates a magnetic field, which repels the permanent magnet component 2, thereby causing the cover to spring open on the box. When the electromagnetic switch is in the off-state, the electromagnet component 1 does not generate a corresponding magnetic field. The electromagnet component 1 is simply a magnetically attractable metal. The electromagnet component 1 and the permanent magnet component 2 attract each other, and the cover can be stably closed on the box.

[0092] The electromagnet assembly 1 includes a magnetically conductive block 14 and at least three magnetic cores that are sequentially spaced and fixed on the magnetically conductive block 14 in a first direction, wherein the three sequentially adjacent magnetic cores are a first magnetic core 11, a second magnetic core 12, and a third magnetic core 13. Figure 12 and Figure 15 As shown, the electromagnet assembly 1 in this embodiment includes only the first magnetic core 11, the second magnetic core 12, and the third magnetic core 13.

[0093] In this embodiment, the first magnetic core 11, the second magnetic core 12, and the third magnetic core 13 are all cuboids with dimensions of 6mm × 15mm × 13mm, where 6mm is the length in the first direction and 13mm is the height in the second direction. The magnetic conductive block 14 has a shape of 30mm × 15mm × 3mm, where 30mm is the length in the first direction and 3mm is the thickness in the second direction.

[0094] It is worth noting that in this embodiment, only the first magnetic core 11 and the third magnetic core 13 are wound with coils via the coil support 15, while the second magnetic core 12 is not wound with a coil. The first magnetic core 11 and the third magnetic core 13 are each wound with 270 turns of coil.

[0095] In this embodiment, the permanent magnet assembly 2 is rectangular in shape, with dimensions of 30mm × 15mm × 2mm, where 30mm is the length in the first direction and 2mm is the thickness in the second direction. Figure 13 and Figure 14 As shown, the permanent magnet assembly 2 in this embodiment has at least a first magnetic pole 21, a second magnetic pole 22, a third magnetic pole 23, a fourth magnetic pole 24, a fifth magnetic pole 25, and a sixth magnetic pole 26. Furthermore, the permanent magnet assembly 2 in this embodiment includes only the first magnetic pole 21, the second magnetic pole 22, the third magnetic pole 23, the fourth magnetic pole 24, the fifth magnetic pole 25, and the sixth magnetic pole 26. The first magnetic pole 21, the second magnetic pole 22, the third magnetic pole 23, the fourth magnetic pole 24, the fifth magnetic pole 25, and the sixth magnetic pole 26 are all cuboids in shape and have the same dimensions.

[0096] like Figure 15As shown, the first magnetic pole 21 is positioned opposite to the first magnetic core 11, the second magnetic pole 22 is positioned opposite to the second magnetic core 12, and the third magnetic core 13 and the fifth magnetic pole 25 are positioned opposite to each other. The third magnetic pole 23 is attached to the side of the first magnetic pole 21 facing away from the first magnetic core 11, the fourth magnetic pole 24 is attached to the side of the second magnetic pole 22 facing away from the second magnetic core 12, and the sixth magnetic pole 26 is attached to the side of the fifth magnetic pole 25 facing away from the third magnetic core 13. Correspondingly, the first magnetic pole 21 and the fifth magnetic pole 25 are located on both sides of the second magnetic pole 22 in the first direction, with the edges of the first magnetic pole 21 and the fifth magnetic pole 25 respectively attached to the two side edges of the second magnetic pole 22; the third magnetic pole 23 and the sixth magnetic pole 26 are located on both sides of the fourth magnetic pole 24 in the first direction, with the edges of the third magnetic pole 23 and the sixth magnetic pole 26 respectively attached to the two side edges of the fourth magnetic pole 24. Among them, the first magnetic pole 21, the fourth magnetic pole 24 and the fifth magnetic pole 25 have the same polarity, such as the N pole in this embodiment; the second magnetic pole 22, the third magnetic pole 23 and the sixth magnetic pole 26 have the same polarity, such as the S pole in this embodiment; in addition, the first magnetic pole 21 and the second magnetic pole 22 have opposite polarities.

[0097] Similarly, in this embodiment, the permanent magnet assembly 2 can also be a single structure obtained by multi-pole magnetization, or it can be obtained by splicing multiple permanent magnets. Both methods can give the permanent magnet assembly 2 a first magnetic pole 21, a second magnetic pole 22, a third magnetic pole 23, a fourth magnetic pole 24, a fifth magnetic pole 25, and a sixth magnetic pole 26.

[0098] Similar to Embodiment 1, the electromagnetic switch in this embodiment also has an on-state and an off-state. When the electromagnetic switch is in the off-state, the first magnetic core 11 and the first magnetic pole 21 attract each other, the second magnetic core 12 and the second magnetic pole 22 attract each other, and the third magnetic core 13 and the fifth magnetic pole 25 attract each other.

[0099] When the electromagnetic switch is energized, the first magnetic core 11 generates a north pole magnetic field that repels the first magnetic pole 21, and the third magnetic core 13 also generates a north pole magnetic field that repels the fifth magnetic pole 25. Although the second magnetic core 12 does not have a coil wound on it, the magnetic fields in the first magnetic core 11 and the third magnetic core 13 can induce the second magnetic core 12 to generate a magnetic field with the same polarity as the second magnetic pole 22 through the magnetic guide block 14, so that the second magnetic core 12 can also repel the second magnetic pole 22. It is easy to understand that based on this working principle, the second magnetic core 12 can be allowed to be without a coil wound, which also allows the electromagnetic switch of this embodiment to be appropriately reduced in size.

[0100] Preferably, the electromagnetic switch further includes a magnetic plate 3, with the side of the third magnetic pole 23 facing away from the first magnetic pole 21, the side of the fourth magnetic pole 24 facing away from the second magnetic pole 22, and the side of the sixth magnetic pole 26 facing away from the fifth magnetic pole 25 attached to the magnetic plate 3. In this embodiment, the magnetic plate 3 can also enhance the magnetic attraction force of the permanent magnet assembly 2. In this embodiment, the magnetic plate 3 is rectangular in shape, with dimensions of 30mm × 15mm × 1.5mm, where 30mm is the length in the first direction and 2mm is the thickness in the second direction. The magnetic plate 3 can be, for example, an iron plate.

[0101] As an example, in this embodiment, the magnetic core and permanent magnet assembly 2 are spaced apart with a spacing of 1 mm. This embodiment performs numerical simulations of the magnetic attraction between electromagnet assembly 1 and permanent magnet assembly 2 when the electromagnetic switch is in the de-energized state, and the repulsive force between electromagnet assembly 1 and permanent magnet assembly 2 at the instant an 8A current is applied to the coil. When the electromagnetic switch is in the de-energized state, the internal magnetic field distribution of the electromagnetic switch is as follows: Figure 16 As shown, the magnetic attraction between electromagnet assembly 1 and permanent magnet assembly 2 is 52.4 N at this time. When the electromagnetic switch is energized, the magnetic field distribution inside the electromagnetic switch is as follows. Figure 17 As shown, the repulsive force between electromagnet assembly 1 and permanent magnet assembly 2 is 32.3N at this time.

[0102] Comparative Example 3:

[0103] like Figure 18 As shown, the difference between this comparative embodiment 3 and embodiment 2 is that the permanent magnet assembly 2 only has a first magnetic pole 21 and a third magnetic pole 23. The first magnetic pole 21 is the N pole, and the third magnetic pole 23 is the S pole. The magnetic core and the permanent magnet assembly 2 are spaced apart with a spacing of 1 mm.

[0104] When the electromagnetic switch is in the off state, the magnetic field distribution inside the electromagnetic switch is as follows: Figure 19 As shown, the magnetic attraction between electromagnet assembly 1 and permanent magnet assembly 2 is 15.1N at this time. When the electromagnetic switch is energized, the magnetic field distribution inside the electromagnetic switch is as follows. Figure 20 As shown, the repulsive force between electromagnet assembly 1 and permanent magnet assembly 2 is 2.3N. Both the magnetic attraction and repulsion forces are less than those in Example 2, and the repulsive force, under the same conditions, is even worse than in Comparative Example 1. This demonstrates that to increase the repulsive force, a higher number of magnetic poles in permanent magnet assembly 2 is not necessarily better.

[0105] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0106] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An electromagnetic switch, characterized by It includes an electromagnet assembly (1) and a permanent magnet assembly (2); The electromagnet assembly (1) includes at least two magnetic cores arranged sequentially at intervals in a first direction, wherein two adjacent magnetic cores are a first magnetic core (11) and a second magnetic core (12), and coils are wound on the first magnetic core (11) and the second magnetic core (12); The permanent magnet assembly (2) has at least a first magnetic pole (21), a second magnetic pole (22), a third magnetic pole (23) and a fourth magnetic pole (24). The first magnetic pole (21) is disposed opposite to the first magnetic core (11), the third magnetic pole (23) is attached to the side of the first magnetic pole (21) away from the first magnetic core (11), the second magnetic pole (22) is disposed opposite to the second magnetic core (12), the fourth magnetic pole (24) is attached to the side of the second magnetic pole (22) away from the second magnetic core (12), the edge of the first magnetic pole (21) is attached to the edge of the second magnetic pole (22), the edge of the third magnetic pole (23) is attached to the edge of the fourth magnetic pole (24), the first magnetic pole (21) and the fourth magnetic pole (24) have the same polarity, the third magnetic pole (23) and the second magnetic pole (22) have the same polarity, and the first magnetic pole (21) and the second magnetic pole (22) have opposite polarities. The electromagnetic switch has an on-state and an off-state. When the electromagnetic switch is in the on-state, the first magnetic core (11) and the first magnetic pole (21) repel each other, and the second magnetic core (12) and the second magnetic pole (22) repel each other. When the electromagnetic switch is in the off-state, the first magnetic core (11) and the first magnetic pole (21) attract each other, and the second magnetic core (12) and the second magnetic pole (22) attract each other.

2. The electromagnetic switch according to claim 1, characterized in that The electromagnetic switch also includes a magnetic plate (3), and the side of the third magnetic pole (23) facing away from the first magnetic pole (21) and the side of the fourth magnetic pole (24) facing away from the second magnetic pole (22) are attached to the magnetic plate (3).

3. The electromagnetic switch according to claim 1, characterized in that, The electromagnet assembly (1) includes a magnetic block (14), and the first magnetic core (11) and the second magnetic core (12) are fixed on the magnetic block (14).

4. A storage box, characterized in that, Includes a housing, a cover that fits over the housing, and The electromagnetic switch as described in claim 1, 2 or 3, wherein one of the electromagnet assembly (1) and the permanent magnet assembly (2) is mounted on the housing and the other is mounted on the cover.

5. The storage box according to claim 4, characterized in that, The magnetic core and the permanent magnet assembly (2) are spaced apart with a spacing between 0.1 mm and 6 mm.

6. An electromagnetic switch, characterized in that, It includes an electromagnet assembly (1) and a permanent magnet assembly (2); The electromagnet assembly (1) includes a magnetic block (14) and at least three magnetic cores that are fixedly spaced apart on the magnetic block (14) in a first direction. The three magnetic cores that are adjacent to each other are a first magnetic core (11), a second magnetic core (12) and a third magnetic core (13). The first magnetic core (11) and the third magnetic core (13) are wound with coils, while the second magnetic core (12) is not wound with a coil. The permanent magnet assembly (2) has at least a first magnetic pole (21), a second magnetic pole (22), a third magnetic pole (23), a fourth magnetic pole (24), a fifth magnetic pole (25) and a sixth magnetic pole (26). The first magnetic pole (21) is disposed opposite to the first magnetic core (11), the third magnetic pole (23) is attached to the side of the first magnetic pole (21) facing away from the first magnetic core (11), the second magnetic pole (22) is disposed opposite to the second magnetic core (12), the fourth magnetic pole (24) is attached to the side of the second magnetic pole (22) facing away from the second magnetic core (12), the third magnetic core (13) and the fifth magnetic pole (25) are disposed opposite to each other, and the sixth magnetic pole (26) is attached to the side of the fifth magnetic pole (25) facing away from the third magnetic core (13). The first magnetic pole (21) and the fifth magnetic pole (25) are respectively located on both sides of the second magnetic pole (22) in a first direction. The edges of the first magnetic pole (21) and the fifth magnetic pole (25) are respectively attached to the two sides of the second magnetic pole (22); the third magnetic pole (23) and the sixth magnetic pole (26) are respectively located on both sides of the fourth magnetic pole (24) in the first direction, and the edges of the third magnetic pole (23) and the sixth magnetic pole (26) are respectively attached to the two sides of the fourth magnetic pole (24). The first magnetic pole (21), the fourth magnetic pole (24) and the fifth magnetic pole (25) have the same polarity, the second magnetic pole (22), the third magnetic pole (23) and the sixth magnetic pole (26) have the same polarity, and the first magnetic pole (21) and the second magnetic pole (22) have opposite polarities. The electromagnetic switch has an on-state and an off-state. When the electromagnetic switch is in the on-state, the first magnetic core (11) and the first magnetic pole (21) repel each other, the third magnetic core (13) and the fifth magnetic pole (25) repel each other, and the second magnetic core (12) obtains the same polarity as the second magnetic pole (22) through the first magnetic core (11), the third magnetic core (13) and the magnetic block (14) so ​​as to repel the second magnetic pole (22). When the electromagnetic switch is in the off-state, the first magnetic core (11) and the first magnetic pole (21) attract each other, the second magnetic core (12) and the second magnetic pole (22) attract each other, and the third magnetic core (13) and the fifth magnetic pole (25) attract each other.

7. The electromagnetic switch according to claim 6, characterized in that, The electromagnetic switch also includes a magnetic plate (3), on which the side of the third magnetic pole (23) facing away from the first magnetic pole (21), the side of the fourth magnetic pole (24) facing away from the second magnetic pole (22), and the side of the sixth magnetic pole (26) facing away from the fifth magnetic pole (25) are attached to the magnetic plate (3).

8. The electromagnetic switch according to claim 6, characterized in that, The permanent magnet assembly (2) is an integral structure and is obtained by multi-pole magnetization, or the permanent magnet assembly (2) is obtained by splicing multiple permanent magnets.

9. A storage box, characterized in that, It includes a housing, a cover covering the housing, and an electromagnetic switch as described in claim 6, 7, or 8, wherein one of the electromagnet assembly (1) and the permanent magnet assembly (2) is mounted on the housing and the other is mounted on the cover.

10. The storage box according to claim 9, characterized in that, The magnetic core and the permanent magnet assembly (2) are spaced apart with a spacing between 0.1 mm and 6 mm.

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