Electromagnetic switch and storage box

Abstract

The invention relates to an electromagnetic switch and a storage box. The electromagnetic switch comprises an electromagnet assembly and a permanent magnet assembly. The electromagnet assembly comprises at least two magnetic cores which are sequentially arranged at intervals in the first direction, the 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; the permanent magnet assembly at least comprises a first magnetic pole, a second magnetic pole, a third magnetic pole and a fourth magnetic pole.

Description

Technical Field

[0001] The present invention relates to the field of electromagnetic switches, and in particular to an electromagnetic switch and a storage box. Background Art

[0002] With the continuous development of electric vehicle technology, the degree of electronic control in electric vehicles has become increasingly high, and the storage boxes in some electric vehicles have also begun to be electrically controlled. These storage boxes mainly include a box body, a box lid, and an electromagnetic switch. The electromagnetic switch includes an electromagnet and a permanent magnet. One of the electromagnet and the permanent magnet is mounted on the box body, and the other is mounted on the box lid. When the electromagnet is not energized, it can attract the permanent magnet, thereby stably closing the box lid on the box body. Once energized, the electromagnet generates a corresponding magnetic field with the same polarity as the permanent magnet. As a result, the electromagnet and the permanent magnet repel each other, and the box lid can automatically pop off the box body.

[0003] In order for the lid to automatically pop off the box, sufficient repulsive force must be generated between the electromagnet and the permanent magnet. To increase this repulsive force, two methods are commonly used: increasing the current flowing through the electromagnet or increasing the size of the permanent magnet. The former not only increases the vehicle's power consumption but also poses a safety hazard. The latter also causes the electromagnetic switch to occupy excessive space inside the box when the lid is closed, reducing the box's storage capacity. Summary of the Invention

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

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

[0006] The electromagnet assembly includes at least two magnetic cores arranged in sequence in a first direction, wherein two adjacent magnetic cores are a first magnetic core and a second magnetic core, and coils are wound around 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 arranged opposite to the first magnetic core, the third magnetic pole is attached to a side of the first magnetic pole facing away from the first magnetic core, the second magnetic pole is arranged opposite to the second magnetic core, the fourth magnetic pole is attached to a 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 polarity;

[0009] The electromagnetic switch has a power-on state and a power-off state. When the electromagnetic switch is in the power-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 power-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 conductive plate, and a side of the third magnetic pole facing away from the first magnetic pole and a side of the fourth magnetic pole facing away from the second magnetic pole are attached to the magnetic conductive plate.

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

[0012] A storage box comprises a box body, a cover body covering the box body, and an electromagnetic switch. One of the electromagnet assembly and the permanent magnet assembly is installed on the box body, and the other is installed on the cover body.

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

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

[0015] The electromagnet assembly includes a magnetic conductive block and at least three magnetic cores fixed to the magnetic conductive block in sequence and spaced apart in a first direction, wherein the three sequentially adjacent magnetic cores 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, and 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 arranged opposite to the first magnetic core, the third magnetic pole is attached to a side of the first magnetic pole facing away from the first magnetic core, the second magnetic pole is arranged opposite to the second magnetic core, the fourth magnetic pole is attached to a side of the second magnetic pole facing away from the second magnetic core, the third magnetic core and the fifth magnetic pole are arranged opposite to each other, and the sixth magnetic pole is attached to a 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 the first direction, and the first magnetic pole edge and the fifth magnetic pole edge are respectively attached to the 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 the first direction, and the third magnetic pole edge and the sixth magnetic pole edge are respectively attached to the 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, and the first magnetic pole and the second magnetic pole have opposite polarity.

[0018] The electromagnetic switch has a power-on state and a power-off state. When the electromagnetic switch is in the power-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 conductive block to repel each other; when the electromagnetic switch is in the power-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 comprises a magnetic conductive plate, and a side of the third magnetic pole facing away from the first magnetic pole, a side of the fourth magnetic pole facing away from the second magnetic pole, and a side of the sixth magnetic pole facing away from the fifth magnetic pole are attached to the magnetic conductive plate.

[0020] In one embodiment, the permanent magnet assembly is an integral structure and is obtained by multi-pole magnetization, or the permanent magnet assembly is obtained by splicing multiple permanent magnets.

[0021] A storage box comprises a box body, a cover body covering the box body, and an electromagnetic switch. One of the electromagnet assembly and the permanent magnet assembly is installed on the box body, and the other is installed on the cover body.

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

[0023] When the electromagnetic switch of the present invention is in the power-off state, the magnetic attraction between the permanent magnet assembly and the electromagnet assembly can be enhanced without increasing the volume of the permanent magnet assembly, thereby allowing the cover to be more stably covered on the box body without increasing the volume of the permanent magnet assembly. This means that the cost of the permanent magnet assembly is controlled, and the permanent magnet assembly will not further occupy the storage space in the box body.

[0024] When the electromagnetic switch of the present invention is in the energized state, the repulsive force between the permanent magnet assembly and the electromagnet assembly can be increased without increasing the volume of the permanent magnet assembly, the number of coil turns on the electromagnet assembly, or the current in the coil, thereby making it easier to open the cover from the box. The absence of increasing the volume of the permanent magnet assembly and the number of coil turns means that the overall cost of the electromagnetic switch is controlled, and the absence of increasing the current in the coil means that the safety risk is controlled.

[0025] In summary, the electromagnetic switch of the present invention can further meet the requirements of high magnetic attraction when in the power-off state, and can further meet the requirements of high repulsion when in the power-on state, while meeting the requirements of safety and miniaturization at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the three-dimensional structure of the electromagnetic switch in Example 1 of the present invention;

[0027] Figure 2 Schematic diagram of the three-dimensional structure of the electromagnet assembly in Example 1 of the present invention;

[0028] Figure 3 Schematic diagram of the three-dimensional structure of the coil support in Example 1 of the present invention;

[0029] Figure 4 Schematic diagram of the three-dimensional structure of the permanent magnet assembly in Example 1 of the present invention;

[0030] Figure 5 Schematic diagram of the main structure of the permanent magnet assembly in Example 1 of the present invention;

[0031] Figure 6 This is a schematic diagram of the main structure of the electromagnetic switch in Example 1 of the present invention;

[0032] Figure 7 This is a simulated diagram of the magnetic field distribution when the electromagnetic switch is in the power-off state in Example 1 of the present invention;

[0033] Figure 8 This is a simulated diagram of the magnetic field distribution when the electromagnetic switch is powered on in Example 1 of the present invention;

[0034] Figure 9 This is a schematic diagram of the main structure of the electromagnetic switch in comparative example 1 of the present invention;

[0035] Figure 10 This is a simulated diagram of the magnetic field distribution when the electromagnetic switch is in the power-off state in Comparative Example 1 of the present invention;

[0036] Figure 11 This is a simulated diagram of the magnetic field distribution when the electromagnetic switch is powered on in Comparative Example 1 of the present invention;

[0037] Figure 12 Schematic diagram of the three-dimensional structure of the electromagnetic switch in Example 2 of the present invention;

[0038] Figure 13 Schematic diagram of the three-dimensional structure of the permanent magnet assembly in Example 2 of the present invention;

[0039] Figure 14 Schematic diagram of the main structure of the permanent magnet assembly in Example 2 of the present invention;

[0040] Figure 15 This is a schematic diagram of the main structure of the electromagnetic switch in Example 2 of the present invention;

[0041] Figure 16 This is a simulated diagram of the magnetic field distribution when the electromagnetic switch is in the power-off state in Example 2 of the present invention;

[0042] Figure 17 This is a simulated diagram of the magnetic field distribution when the electromagnetic switch is powered on in Example 2 of the present invention;

[0043] Figure 18 This is a schematic diagram of the main structure of the electromagnetic switch in comparative example 3 of the present invention;

[0044] Figure 19 This is a simulated diagram of the magnetic field distribution when the electromagnetic switch is in a power-off state in Comparative Example 3 of the present invention;

[0045] Figure 20 This is a simulation diagram of the magnetic field distribution when the electromagnetic switch in comparative example 3 of the present invention is in the power-on state.

[0046] Reference numerals:

[0047] 1. Electromagnet assembly; 11. First magnetic core; 12. Second magnetic core; 13. Third magnetic core; 14. Magnetic block; 15. Coil bracket; 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 plate. DETAILED DESCRIPTION

[0048] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0049] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0051] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0052] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0053] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate 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 implementation methods.

[0054] Example 1:

[0055] This embodiment provides a storage box, comprising a box body, a cover covering the box body, and an electromagnetic switch, wherein the electromagnetic switch comprises 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 cover.

[0056] The electromagnetic switch has a power-on state and a power-off state. When the electromagnetic switch is in the power-on state, the electromagnet component 1 generates a magnetic field, which repels the permanent magnet component 2, thereby causing the cover to pop open on the box body; when the electromagnetic switch is in the power-off state, the electromagnet component 1 does not generate a corresponding magnetic field. The electromagnet component 1 is merely a magnetically attractive metal, and the electromagnet component 1 and the permanent magnet component 2 attract each other, so that the cover body can be firmly covered on the box body.

[0057] The electromagnet assembly 1 includes at least two magnetic cores arranged in sequence in a first direction, wherein the two adjacent magnetic cores are a first magnetic core 11 and a second magnetic core 12. Figure 1-Figure 3 As shown, the electromagnet assembly 1 of this embodiment comprises only a first magnetic core 11 and a second magnetic core 12. A coil support 15 is provided over the first and second magnetic cores 11, 12, and a coil (not shown) is wound around the coil support 15. In other words, in this embodiment, a coil is wound around both the first and second magnetic cores 11, 12. The total number of coil turns on the first and second magnetic cores 11, 12 is 400, with 200 coil turns each around the first and second magnetic cores 11, 12.

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

[0059] The permanent magnet assembly 2 of this embodiment is in the shape of a cuboid with dimensions of 30 mm × 15 mm × 2 mm, where 30 mm is the length in the first direction and 2 mm 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. Figure 4 and Figure 5 As shown, the permanent magnet assembly 2 of this embodiment has only the first magnetic pole 21, the second magnetic pole 22, the third magnetic pole 23 and the 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 rectangular in shape and have exactly the same size specifications.

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

[0061] Specific as Figure 6 As shown, the first magnetic pole 21 and the first magnetic core 11 are arranged opposite to each other in the second direction, the second magnetic pole 22 and the second magnetic core 12 are arranged opposite to each other in the second direction, the third magnetic pole 23 is attached to the side of the first magnetic pole 21 facing away from the first magnetic core 11, and 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 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, wherein 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 power-off 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 attractive 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 achieving attraction between the electromagnet assembly 1 and the permanent magnet assembly 2.

[0064] When the electromagnetic switch is in the power-on state, the coils on the first magnetic core 11 and the second magnetic core 12 are energized, the first magnetic core 11 forms the same N-pole magnetic field as the first magnetic pole 21, and the second magnetic core 12 forms the same S-pole magnetic field as the second magnetic pole 22. As a result, 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, and the electromagnet assembly 1 and the permanent magnet assembly 2 can be separated from each other.

[0065] Preferably, the electromagnetic switch of this embodiment further includes a magnetic conductive plate 3. 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 conductive plate 3. The magnetic conductive plate 3 enhances the magnetic properties of the permanent magnet assembly 2. In this embodiment, the magnetic conductive plate 3 is a rectangular parallelepiped with dimensions of 30 mm × 15 mm × 1.5 mm, where 30 mm represents the length in the first direction and 2 mm represents the thickness in the second direction. The magnetic conductive plate 3 can be, for example, an iron plate.

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

[0067] Preferably, the electromagnet assembly 1 of this embodiment further includes a magnetic conductive block 14, to which the first magnetic core 11 and the second magnetic core 12 are fixed. When the electromagnetic switch is in the energized state, the magnetic field within the first magnetic core 11 and the magnetic field within the second magnetic core 12 can be mutually transmitted through the magnetic conductive block 14, thereby generating a coupling effect, so that the magnetic fields within the first magnetic core 11 and the second magnetic core 12 are simultaneously strengthened, thereby enhancing the repulsive force between the electromagnet assembly 1 and the permanent magnet assembly 2.

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

[0069] Typically, the magnetic core and the permanent magnet assembly 2 are spaced apart and the spacing is 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, and d being between 0.1 mm and 6 mm.

[0070] This embodiment performs numerical simulations on the magnetic attraction between the electromagnet assembly 1 and the permanent magnet assembly 2 when the electromagnetic switch is in the power-off state, and the repulsion between the electromagnet assembly 1 and the permanent magnet assembly 2 at the moment when the coil is energized by a current of 8 A. The numerical simulation results are shown in Table 1.

[0071] Table 1

[0072]

[0073] Among them, when d=6mm and the electromagnetic switch is in the power-off state, the magnetic field distribution inside the electromagnetic switch is as follows Figure 7 As shown; when d = 6mm and the coil is fed with 8A current, the magnetic field distribution inside the electromagnetic switch is as shown Figure 8 shown.

[0074] Comparative Example 1:

[0075] like Figure 9As shown, the difference between this comparative example 1 and example 1 is that the permanent magnet assembly 2 only has a first magnetic pole 21 and a third magnetic pole 23, and the shapes and sizes of the first magnetic pole 21 and the third magnetic pole 23 are completely identical. The first magnetic pole 21 is an N pole, and the third magnetic pole 23 is an S pole. 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] In addition, the permanent magnet assembly 2 of this comparative example 1 and the permanent magnet assembly 2 of example 1 have the same shape, both measuring 30 mm×15 mm×2 mm. The first magnetic core 11 and the second magnetic core 12 are each wound with 200 turns of coil.

[0077] In this comparative example 1, numerical simulations were performed on the magnetic attraction between the electromagnet assembly 1 and the permanent magnet assembly 2 when the electromagnetic switch is in the power-off state, and the repulsion between the electromagnet assembly 1 and the permanent magnet assembly 2 at the moment when the coil is energized by a current of 8 A. The numerical simulation results are shown in Table 2.

[0078] Table 2

[0079]

[0080] Among them, when d=6mm and the electromagnetic switch is in the power-off state, the magnetic field distribution inside the electromagnetic switch is as follows Figure 10 As shown; when d = 6mm and the coil is fed with 8A current, the magnetic field distribution inside the electromagnetic switch is as shown Figure 11 shown.

[0081] Comparing Table 1 and Table 2, taking the case of d=6 mm as an example, compared with Comparative Example 1, the magnetic attraction force of Example 1 is increased from 4 N to 7.8 N, an increase of about 1 times, and the repulsion force is increased from 1.5 N to 4.5 N, an increase of about two 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 6 mm, the total number of turns of the coils wound on the first magnetic core 11 and the second magnetic core 12 is increased to 946, and the number of turns of the coils on the first magnetic core 11 and the second magnetic core 12 is the same.

[0084] In this comparative example 2, numerical simulations were performed on the magnetic attraction between the electromagnet assembly 1 and the permanent magnet assembly 2 when the electromagnetic switch is in the power-off state, and the repulsion between the electromagnet assembly 1 and the permanent magnet assembly 2 at the moment when the coil is energized by a current of 8 A. The numerical simulation results are shown in Table 3.

[0085] Table 3

[0086]

[0087] Comparing Tables 1 and 3, it can be seen that the electromagnetic switch in Comparative Example 2 achieves the same magnetic attraction and repulsion as in Example 1 only when the thickness of the permanent magnet assembly 2 is increased from 2 mm to 6 mm (doubling the volume of the permanent magnet assembly 2) and the total number of coil turns is increased from 400 to 946 (a 136.5% increase). Furthermore, the increased total number of coil turns in Comparative Example 2 also increases resistance, requiring a higher voltage to maintain the same current in the coil as in Example 1.

[0088] By comprehensively comparing Example 1, Comparative Example 1 and Comparative Example 2, it can be found that the electromagnetic switch in Example 1 has at least the following advantages: when the electromagnetic switch is in the power-off 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, so that the cover body can be more stably covered on the box body without increasing the volume of the permanent magnet assembly 2, which means that 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 body; when the electromagnetic switch is in the power-on 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, and the current in the coil, so that the cover body can be easier to open from the box body, and the volume and number of coil turns of the permanent magnet assembly 2 do not need to be increased, which means that the overall cost of the electromagnetic switch is controlled, and the current in the coil does not need to be increased, which means that the safety risk is controlled.

[0089] Example 2:

[0090] This embodiment provides a storage box, comprising a box body, a cover covering the box body, and an electromagnetic switch, wherein the electromagnetic switch comprises 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 cover.

[0091] The electromagnetic switch has a power-on state and a power-off state. When the electromagnetic switch is in the power-on state, the electromagnet component 1 generates a magnetic field, which repels the permanent magnet component 2, thereby causing the cover to pop open on the box body; when the electromagnetic switch is in the power-off state, the electromagnet component 1 does not generate a corresponding magnetic field. The electromagnet component 1 is merely a magnetically attractive metal, and the electromagnet component 1 and the permanent magnet component 2 attract each other, so that the cover body can be firmly covered on the box body.

[0092] The electromagnet assembly 1 includes a magnetic conductive block 14 and at least three magnetic cores fixed on the magnetic conductive block 14 in sequence and spaced apart 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 15As shown, the magnetic cores included in the electromagnet assembly 1 of this embodiment are 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 rectangular parallelepipeds with dimensions of 6 mm × 15 mm × 13 mm, where 6 mm is the length in the first direction and 13 mm is the height in the second direction. The magnetic conductive block 14 is 30 mm × 15 mm × 3 mm, where 30 mm is the length in the first direction and 3 mm 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 through the coil support 15, while no coil is wound around the second magnetic core 12. The first magnetic core 11 and the third magnetic core 13 are each wound with 270 turns of coils.

[0095] The permanent magnet assembly 2 of this embodiment is in the shape of a cuboid with dimensions of 30 mm × 15 mm × 2 mm, where 30 mm is the length in the first direction and 2 mm is the thickness in the second direction. Figure 13 and Figure 14 As shown, the permanent magnet assembly 2 of 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 magnetic poles included in the permanent magnet assembly 2 of this embodiment are 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 in the shape of a rectangular parallelepiped and have the same size specifications.

[0096] like Figure 15As shown, the first magnetic pole 21 is arranged opposite to the first magnetic core 11, the second magnetic pole 22 is arranged opposite to the second magnetic core 12, and the third magnetic core 13 is arranged opposite to the fifth magnetic pole 25; 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. Accordingly, the first magnetic pole 21 and the fifth magnetic pole 25 are respectively located on both sides of the second magnetic pole 22 in the first direction, and the edges of the first magnetic pole 21 and the fifth magnetic pole 25 are respectively attached to the edges 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 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 polarity.

[0097] Similarly, the permanent magnet assembly 2 of this embodiment can also be a one-piece structure and obtained by multi-pole magnetization, or it can be obtained by splicing multiple permanent magnets. Both methods can make the permanent magnet assembly 2 have 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 Example 1, the electromagnetic switch of this embodiment also has a power-on state and a power-off state. When the electromagnetic switch is in the power-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 powered on, an N-pole magnetic field is generated within the first magnetic core 11, which repel the first magnetic pole 21. Similarly, an N-pole magnetic field is generated within the third magnetic core 13, which repel the fifth magnetic pole 25. Although no coil is wound around the second magnetic core 12, the magnetic fields within the first magnetic core 11 and the third magnetic core 13 can induce the second magnetic core 12 to have the same polarity as the second magnetic pole 22 through the magnetic conductive block 14, causing the second magnetic core 12 to repel the second magnetic pole 22. It is easy to understand that, based on this operating principle, the second magnetic core 12 can be left unwound, thereby allowing the electromagnetic switch of this embodiment to be appropriately reduced in size.

[0100] Preferably, the electromagnetic switch further comprises a magnetic conductive plate 3, to 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. The magnetic conductive plate 3 of this embodiment can also enhance the magnetic attraction of the permanent magnet assembly 2. The magnetic conductive plate 3 of this embodiment is in the shape of a rectangular parallelepiped, with dimensions of 30 mm × 15 mm × 1.5 mm, where 30 mm represents the length in the first direction and 2 mm represents the thickness in the second direction. The magnetic conductive plate 3 can be, for example, an iron plate.

[0101] As an example, the magnetic core and the permanent magnet assembly 2 of this embodiment are spaced apart and the spacing is 1mm. This embodiment numerically simulates the magnetic attraction between the electromagnet assembly 1 and the permanent magnet assembly 2 when the electromagnetic switch is in the power-off state, and the repulsion between the electromagnet assembly 1 and the permanent magnet assembly 2 when the coil is fed with an 8A current. When the electromagnetic switch is in the power-off state, the magnetic field distribution inside the electromagnetic switch is as follows: Figure 16 As shown, the magnetic attraction between the electromagnet assembly 1 and the permanent magnet assembly 2 is 52.4N. When the electromagnetic switch is in the power-on state, the magnetic field distribution inside the electromagnetic switch is as follows Figure 17 As shown, at this time, the repulsive force between the electromagnet assembly 1 and the permanent magnet assembly 2 is 32.3N.

[0102] Comparative Example 3:

[0103] like Figure 18 As shown, the difference between this comparative example 3 and example 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 an N pole, and the third magnetic pole 23 is an S pole. The magnetic core and the permanent magnet assembly 2 are spaced apart and the spacing is 1 mm.

[0104] When the electromagnetic switch is in the power-off state, the magnetic field distribution inside the electromagnetic switch is as follows: Figure 19 As shown, the magnetic attraction between the electromagnet assembly 1 and the permanent magnet assembly 2 is 15.1N. When the electromagnetic switch is in the power-on state, the magnetic field distribution inside the electromagnetic switch is as follows: Figure 20 As shown, the repulsive force between the electromagnet assembly 1 and the permanent magnet assembly 2 is 2.3 N. Both the magnetic attraction and repulsion are smaller than those in Example 2. Under the same conditions, the repulsion is even worse than that in Comparative Example 1. This shows that in order to increase the repulsion, the more magnetic poles the permanent magnet assembly 2 has, the better.

[0105] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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 above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. An electromagnetic switch, characterized in that: It includes an electromagnet assembly (1) and a permanent magnet assembly (2); The electromagnet assembly (1) comprises at least two magnetic cores arranged in sequence and spaced apart 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 around 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 arranged 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 arranged 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 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 further comprises a magnetic conductive plate (3), and a side of the third magnetic pole (23) facing away from the first magnetic pole (21) and a side of the fourth magnetic pole (24) facing away from the second magnetic pole (22) are attached to the magnetic conductive plate (3).

3. The electromagnetic switch according to claim 1, wherein: The electromagnet assembly (1) comprises a magnetic conductive block (14), and the first magnetic core (11) and the second magnetic core (12) are fixed on the magnetic conductive block (14).

4. A storage box, characterized in that: It comprises a box body, a cover body covering the box body and According to the electromagnetic switch as claimed in claim 1, 2 or 3, 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 cover body.

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

6. An electromagnetic switch, characterized in that: It comprises an electromagnet assembly (1) and a permanent magnet assembly (2); The electromagnet assembly (1) comprises a magnetic conductive block (14) and at least three magnetic cores fixed on the magnetic conductive block (14) in sequence and at intervals in a first direction, wherein the three magnetic cores 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, and 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 arranged 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 arranged 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 arranged opposite to each other, the sixth magnetic pole (26) is attached to the side of the fifth magnetic pole (25) facing away from the third magnetic core (13), and the first magnetic pole (21) and the fifth magnetic pole (25) are respectively located on both sides of the second magnetic pole (22) in the first direction. , and the edge of the first magnetic pole (21) and the edge of the fifth magnetic pole (25) are respectively attached to the edges on both 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 edge of the third magnetic pole (23) and the edge of the sixth magnetic pole (26) are respectively attached to the edges on both 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 a power-on state and a power-off state. When the electromagnetic switch is in the power-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 conductive block (14) to repel each other with the second magnetic pole (22); when the electromagnetic switch is in the power-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 further comprises a magnetic conductive plate (3), wherein a side of the third magnetic pole (23) facing away from the first magnetic pole (21), a side of the fourth magnetic pole (24) facing away from the second magnetic pole (22), and a side of the sixth magnetic pole (26) facing away from the fifth magnetic pole (25) are attached to the magnetic conductive plate (3).

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

9. A storage box, characterized in that: The electromagnetic switch comprises a box body, a cover body covering the box body, and the electromagnetic switch as claimed in claim 6, 7 or 8, wherein 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 cover body.

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

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