Permanent magnet device and manufacturing method

Abstract

The invention belongs to the technical field of permanent magnet manufacturing, and discloses a permanent magnet device and a manufacturing method. The permanent magnet device comprises a mounting shell, a third permanent magnet, two first permanent magnets and two second permanent magnets, the two first permanent magnets are symmetrically arranged in the accommodating space; the two second permanent magnets are clamped between the two first permanent magnets, the N pole of one of the two second permanent magnets is arranged upwards, and the N pole of the other second permanent magnet is arranged downwards; one end, close to the inner wall of the mounting shell, of the first permanent magnet adjacent to the second permanent magnet with the N pole facing downwards is an S pole, and one end, close to the inner wall of the mounting shell, of the other first permanent magnet is an N pole; the third permanent magnet is arranged between the two second permanent magnets, the end, close to the second permanent magnet with the downward N pole, of the third permanent magnet is the N pole, and the end, close to the second permanent magnet with the upward N pole, of the third permanent magnet is the S pole. According to the permanent magnet device, simple and convenient assembly of the Halbach structure magnet can be realized, the maintainability is enhanced, and the permanent magnet device is suitable for batch production, so that the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of permanent magnet manufacturing, and in particular to a permanent magnet device and a manufacturing method. Background Art

[0002] Magnetic materials are widely used in computer technology, information technology, aerospace technology, communication technology, transportation technology, home appliance technology and other fields. In particular, NdFeB permanent magnets can generate sufficient magnetic fields and have excellent magnetic properties. They are often used in permanent magnet motors, speakers, magnetic separators, computer disk drives, magnetic resonance imaging equipment and instruments, etc.

[0003] Halbach structure magnet is an array-type permanent magnet assembly, which is assembled from single magnetic blocks with magnetization directions arranged according to a certain pattern. The magnets are magnetized first and then assembled. In this structure, the magnets attract each other and also repel each other. Since the magnetic field of NdFeB permanent magnets is very strong, in the design of the prior art, a certain gap is reserved between the permanent magnets for the convenience of Halbach structure assembly. If the distance between the permanent magnets is very small, the repulsive force between adjacent permanent magnets will be very large, which will bring great difficulties to the assembly work, and easily cause damage to the magnetic blocks or cause production safety accidents such as the operator's hand being pinched.

[0004] Therefore, there is an urgent need to provide a new type of permanent magnet device and manufacturing method to solve the above technical problems in the prior art. Summary of the invention

[0005] The object of the present invention is to provide a permanent magnet device, which can realize the simple assembly of Halbach structure magnets, has enhanced maintainability, is suitable for mass production, and thus reduces production costs.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] The permanent magnet device comprises a mounting shell, a third permanent magnet, two first permanent magnets and two second permanent magnets, wherein the mounting shell has a closed accommodating space; the two first permanent magnets are symmetrically arranged in the accommodating space; the two second permanent magnets are sandwiched between the two first permanent magnets, one of the two second permanent magnets is arranged with an N pole facing upward, and the other is arranged with an N pole facing downward; wherein the end of the first permanent magnet adjacent to the second permanent magnet with an N pole facing downward, close to the circumferential inner wall of the mounting shell, is an S pole, and the end of the other first permanent magnet close to the circumferential inner wall of the mounting shell is an N pole; the third permanent magnet is arranged between the two second permanent magnets, the end of the third permanent magnet close to the second permanent magnet with an N pole facing downward is an N pole, and the end of the third permanent magnet close to the second permanent magnet with an N pole facing upward is an S pole.

[0008] Optionally, a non-magnetic part is arranged between the first permanent magnet and the adjacent second permanent magnet, and a gap of a preset thickness is provided between the non-magnetic part and the second permanent magnet.

[0009] Optionally, the height of the non-magnetic component is greater than the height of the first permanent magnet, and is not greater than the depth of the accommodating space.

[0010] Optionally, the installation shell includes a lower shell and an upper cover plate, and the top of the lower shell has a mounting opening for matching the mounting of the upper cover plate.

[0011] Optionally, a ferromagnetic block is sandwiched between the upper cover plate and the third permanent magnet.

[0012] Optionally, the ferromagnetic block and the upper cover plate are both ferromagnetic parts, and the ferromagnetic block is welded to the bottom of the upper cover plate.

[0013] Optionally, the lower shell includes a surrounding plate and a bottom cover plate, the surrounding plate is arranged on the top of the bottom cover plate, and the mounting opening is formed on the top of the surrounding plate.

[0014] Optionally, the length of the lower shell is CC5, the width of the lower shell is CC2, and CC5≥3*CC3.

[0015] Optionally, the first permanent magnet, the second permanent magnet and the third permanent magnet are respectively integrally formed or formed by a combination of multiple magnets that attract each other.

[0016] Another object of the present invention is to provide a method for manufacturing a permanent magnet device, which is used to manufacture the permanent magnet device as described in any of the above schemes, comprising the steps of:

[0017] S1. Prepare the above-mentioned installation shell, which has the above-mentioned accommodating space; S2. Place the two above-mentioned first permanent magnets symmetrically in the above-mentioned accommodating space, wherein the N pole of one of the above-mentioned first permanent magnets is arranged toward the S pole of the other above-mentioned first permanent magnet; S3. Place one of the above-mentioned second permanent magnets in the above-mentioned accommodating space with the N pole facing upward, and place the other above-mentioned second permanent magnet in the above-mentioned accommodating space with the N pole facing downward, and the two above-mentioned second permanent magnets are symmetrically arranged; S4. Place the above-mentioned third permanent magnet between the two above-mentioned second permanent magnets, and the N pole of the above-mentioned third permanent magnet faces the above-mentioned first permanent magnet with the N pole facing downward; and the N pole of one of the above-mentioned first permanent magnets is arranged opposite to the N pole of the above-mentioned third permanent magnet, and the S pole of the other above-mentioned first permanent magnet is arranged opposite to the S pole of the above-mentioned third permanent magnet.

[0018] Beneficial effects:

[0019] The permanent magnet device in the present invention uses a mounting shell to form a closed accommodation space, in which two first permanent magnets are symmetrically arranged, two second permanent magnets are arranged between the two first permanent magnets, a third permanent magnet is arranged between the two second permanent magnets, one of the two second permanent magnets is arranged with an N pole facing upward, the other N pole is arranged downward, and the N pole of the third permanent magnet is arranged toward the N pole of the second permanent magnet with an N pole facing downward, the first permanent magnet and the third permanent magnet are arranged with opposite magnetic properties, forming a Halbach permanent magnet structure, thereby forming a closed horizontal magnetic field at the bottom of the mounting shell, and the intensity of the horizontal magnetic field can be as high as 1000Gs to 8000Gs, which can generate a magnetic attraction force to attract ferromagnetic material workpieces, and the workpieces attracted can move from the two sides with low magnetic fields to the middle part with high magnetic fields, so as to realize the arrangement and combination of workpieces along a constant direction. The permanent magnet device can realize the simple assembly of Halbach structure magnets, the maintainability is enhanced, and it is suitable for mass production, thereby reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of a permanent magnet device provided in a specific embodiment of the present invention;

[0021] Figure 2 is a cross-sectional view of a permanent magnet device provided by a specific embodiment of the present invention with the magnetic conductive ring hidden;

[0022] Figure 3 is a top view of a lower housing provided in a specific embodiment of the present invention;

[0023] Figure 4 is a cross-sectional view of a lower housing provided in a specific embodiment of the present invention;

[0024] Figure 5 It is a schematic diagram of a magnetic conductive ring provided in a specific embodiment of the present invention.

[0025] In the figure:

[0026] 100, installation shell; 101, installation port; 102, accommodation space; 110, lower shell; 111, enclosure; 112, bottom cover; 120, upper cover;

[0027] 200, a first permanent magnet; 210, a non-magnetic component;

[0028] 300. a second permanent magnet;

[0029] 400, a third permanent magnet; 410, a ferromagnetic block;

[0030] 500. Magnetic ring. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0035] Please refer to Figures 1 to 5In this embodiment, the permanent magnet device includes a mounting shell 100, a third permanent magnet 400, two first permanent magnets 200 and two second permanent magnets 300. The mounting shell 100 has a closed accommodation space 102. The two first permanent magnets 200 are symmetrically arranged in the accommodation space 102. The two second permanent magnets 300 are sandwiched between the two first permanent magnets 200. One of the two second permanent magnets 300 is arranged with an N pole facing upward, and the other is arranged with an N pole facing downward. The end of the first permanent magnet 200 adjacent to the second permanent magnet 300 that is close to the circumferential inner wall of the mounting shell 100 is an S pole, and the end of the other first permanent magnet 200 that is close to the circumferential inner wall of the mounting shell 100 is an N pole; the third permanent magnet 400 is arranged between the two second permanent magnets 300, and the end of the third permanent magnet 400 that is close to the second permanent magnet 300 with the N pole facing downward is an N pole, and the end of the third permanent magnet 400 that is close to the second permanent magnet 300 with the N pole facing upward is an S pole.

[0036] The permanent magnet device in the present invention uses an installation shell 100 to form a closed accommodating space 102, and two first permanent magnets 200 are symmetrically arranged in the accommodating space 102, two second permanent magnets 300 are arranged between the two first permanent magnets 200, and a third permanent magnet 400 is arranged between the two second permanent magnets 300, one of the two second permanent magnets 300 is arranged with an N pole facing upward, and the other N pole is arranged downward, and the N pole of the third permanent magnet 400 is arranged toward the N pole of the second permanent magnet 300 with an N pole facing downward, and the first permanent magnet 200 and the third permanent magnet 400 are arranged with opposite magnetic properties to form a Halbach permanent magnet structure, thereby forming a closed horizontal magnetic field at the bottom of the installation shell 100, and the intensity of the horizontal magnetic field can be as high as 1000Gs to 8000Gs, which can generate a magnetic attraction force to attract ferromagnetic workpieces, and the attracted workpieces can move from the two sides with low magnetic fields to the middle part with high magnetic fields, so as to realize the arrangement and combination of workpieces along a constant direction. The permanent magnet device can realize the simple assembly of the Halbach structure magnet, the maintainability is enhanced, and it is suitable for mass production, thereby reducing the production cost.

[0037] like Figure 1 and Figure 5 As shown, the workpiece is a ferromagnetic round rod or long strip, or is a ferromagnetic magnetic ring 500 selected in this embodiment. The length of the magnetic ring 500 is L1, and the width is DH. The magnetic ring 500 is made of a cylindrical profile, and the diameter of the cylindrical profile is φd. In this embodiment, φd is 17 mm. The size of the magnetic ring 500 is selected by technical personnel in this field according to actual use requirements, and no specific limitation is made here.

[0038] Specifically, when the magnetic ring 500 is subjected to the downward pulling force F, the magnetic ring 500 moves toward the position with the strongest magnetic field intensity under the action of the magnetic field of the permanent magnet device, that is, moves to the center of the bottom end of the permanent magnet device, so that the left and right directions of the magnetic ring 500 can be kept constant and fixed, thereby realizing the arrangement and combination of the magnetic ring 500 in a preset direction.

[0039] Please continue to refer to Figure 1 The installation housing 100 includes a lower housing 110 and an upper cover plate 120. The top of the lower housing 110 has an installation opening 101 for mounting the upper cover plate 120. The installation housing 100 configured in this way can allow the first permanent magnet 200, the second permanent magnet 300 and the third permanent magnet 400 to be placed into the accommodation space 102 from the installation opening 101, and then the upper cover plate 120 is used to close the installation opening 101, thereby achieving the closure of the magnetic field, and the installation is simple and convenient, and easy to maintain.

[0040] Return to reference Figure 1 and Figure 2 A non-magnetic part 210 is provided between the first permanent magnet 200 and the adjacent second permanent magnet 300, and a gap of a preset thickness is provided between the non-magnetic part 210 and the second permanent magnet 300. The non-magnetic part 210 is made of a non-magnetic material, and can be selected as an aluminum block, copper, a wood block, a hardboard, etc. In this embodiment, an aluminum block is selected, so that a gap is formed between the first permanent magnet 200 and the second permanent magnet 300, so as to enhance the magnetic field and improve the convenience of installing the permanent magnet device.

[0041] In this embodiment, the height of the non-magnetic part 210 is greater than the height of the first permanent magnet 200, and is not greater than the depth of the accommodation space 102. The height of the non-magnetic part 210 is greater than the height of the first permanent magnet 200, which can achieve the blocking between the first permanent magnet 200 and the second permanent magnet 300, and does not exceed the depth of the accommodation space 102, specifically, does not exceed the remaining depth of the accommodation space 102 after the upper cover plate 120 is installed, does not affect the installation of the upper cover plate 120, and improves the convenience of installation.

[0042] Optionally, a ferromagnetic block 410 is sandwiched between the upper cover plate 120 and the third permanent magnet 400. The ferromagnetic block 410 can fix the second permanent magnet 300 between the upper cover plate 120 and the accommodating space 102, improve the stability of the installation, and can also increase the magnetic field strength, thereby improving the magnetic field strength and performance of the permanent magnet device.

[0043] In this embodiment, the ferromagnetic block 410 and the upper cover plate 120 are both ferromagnetic parts, and the ferromagnetic block 410 is welded to the bottom of the upper cover plate 120. The ferromagnetic block 410 and the upper cover plate 120 are made of ferromagnetic materials with low magnetic resistance, such as pure iron, soft iron or 45# carbon steel, and are welded together to form an integral magnetic conductive plate, thereby increasing the external magnetic field strength of the permanent magnet device and forming a closed magnetic circuit space.

[0044] Optionally, the first permanent magnet 200, the second permanent magnet 300 and the third permanent magnet 400 are formed in one piece or are composed of a plurality of magnets attracted to each other. The first permanent magnet 200, the second permanent magnet 300 and the third permanent magnet 400 can be made of a single magnet, or can be composed of a plurality of magnets attracted to each other, such as 2, 3, 4, 5 or 6 magnets of the same size. In this embodiment, the second permanent magnet 300 is composed of 3 NdFeB magnets stacked together, each of which has a height of 10 mm. After stacking, the height CCA5 of the second permanent magnet 300 is 30 mm, and the width CCA3 is 30 mm.

[0045] The length*width*height of the third permanent magnet 400 is 25mm*30mm*15mm, which will not be repeated here. It should be noted that the width of the first permanent magnet 200 is CCA2, the width of the second permanent magnet 300 is CCA3, the width of the third permanent magnet 400 is CCA4, the width of the non-magnetic part 210 is L (not shown in the figure), and the length of the accommodating space 102 is CC4, 2*CCA2+2CCA3+CCA4+2*L<CC4, which will not be repeated here.

[0046] like Figures 2 to 4 As shown, the lower shell 110 includes a panel 111 and a bottom cover 112. The panel 111 is arranged around the top of the bottom cover 112, and the mounting opening 101 is formed on the top of the panel 111. The lower shell 110 configured in this way can be processed to form the panel 111, the upper cover 120 and the bottom cover 112 respectively, so as to achieve fine processing of each component, and then be combined to form the required mounting shell 100, so that the overall performance and service life are improved, the production difficulty is reduced, and the maintainability is enhanced, and it is suitable for mass production.

[0047] It should be noted that the lower shell 110 is made of non-magnetic 304 stainless steel material. After the enclosure 111 is spliced, it is combined with the bottom cover 112 to form the lower shell 110. To ensure the sealing effect, welding can be used for assembly, and then the weld can be polished to improve the sealing effect.

[0048] Optionally, the length of the lower shell 110 is CC5, the width of the lower shell 110 is CC2, and CC5≥3*CC3. Such dimensions can ensure that the permanent magnet device forms a narrow and long magnetic field, thereby realizing a horizontal magnetic field with a strong magnetic field in the middle and weak magnetic fields at both ends, which is convenient for operators to use.

[0049] Furthermore, the height of the lower shell 110 is CC1, and the value range of CC1 is 20mm to 150mm. The shell thickness of the lower shell 110 is CCA1, and the value range of CCA1 is 1mm to 5mm; the value range of CC2 is 20mm to 100mm, and the value range of CC5 is 50mm to 200mm. Specifically, CCA1=3mm, CC1=40mm, CC2=40mm, CC5=170mm.

[0050] In this embodiment, the width CC3 of the accommodating space 102 is 30 mm, the length CC4 of the accommodating space 102 is 165 mm, which is slightly larger than the length of the upper cover 120, and the length * width * height of the upper cover 120 is 163 mm * 36 mm * 8 mm, which can form a gap fit with the cross-section of the accommodating space 102, thereby enhancing the bottom magnetic field strength of the permanent magnet device.

[0051] Another object of the present invention is to provide a method for manufacturing a permanent magnet device, which is used to manufacture the permanent magnet device as described in any of the above schemes, comprising the steps of:

[0052] S1. Prepare the above-mentioned installation shell 100, and the above-mentioned installation shell 100 has the above-mentioned accommodating space 102; S2. Place the two above-mentioned first permanent magnets 200 symmetrically in the above-mentioned accommodating space 102, wherein the N pole of one of the above-mentioned first permanent magnets 200 is arranged toward the S pole of the other above-mentioned first permanent magnet 200; S3. Place one of the above-mentioned second permanent magnets 300 in the above-mentioned accommodating space 102 with the N pole facing upward, and place the other above-mentioned second permanent magnet 300 in the above-mentioned accommodating space 102 with the N pole facing downward, and the two above-mentioned second permanent magnets 300 are symmetrically arranged; S4. Place the above-mentioned third permanent magnet 400 between the two above-mentioned second permanent magnets 300, and the N pole of the above-mentioned third permanent magnet 400 faces the above-mentioned first permanent magnet 200 with the N pole facing downward; and the N pole of one of the above-mentioned first permanent magnets 200 is arranged opposite to the N pole of the above-mentioned third permanent magnet 400, and the S pole of the other above-mentioned first permanent magnet 200 is arranged opposite to the S pole of the above-mentioned third permanent magnet 400.

[0053] The first permanent magnet 200, the second permanent magnet 300 and the third permanent magnet 400 can be fixed to the accommodating space 102 by gluing, or by mechanical fixing such as fixing with a connector or snapping. Mechanical fixing is safer and more reliable, which will not be described in detail here.

[0054] The method for manufacturing a permanent magnet device is used to manufacture a permanent magnet device as described in any of the above schemes, and can realize the simple assembly of Halbach structure magnets, enhance maintainability, and be suitable for mass production, thereby reducing production costs. The method for manufacturing a permanent magnet device has all the beneficial effects of the permanent magnet device described in any of the above schemes, which will not be repeated here.

[0055] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A permanent magnet device, characterized in that include: An installation housing (100), wherein the installation housing (100) has a closed accommodation space (102); Two first permanent magnets (200), the two first permanent magnets (200) being symmetrically arranged in the accommodation space (102); Two second permanent magnets (300), the two second permanent magnets (300) are sandwiched between the two first permanent magnets (200), one of the two second permanent magnets (300) has an N pole facing upward, and the other has an N pole facing downward; wherein the first permanent magnet (200) adjacent to the second permanent magnet (300) with an N pole facing downward has an end close to the circumferential inner wall of the mounting shell (100) as an S pole, and the other first permanent magnet (200) has an end close to the circumferential inner wall of the mounting shell (100) as an N pole; A third permanent magnet (400), wherein the third permanent magnet (400) is arranged between the two second permanent magnets (300), wherein one end of the third permanent magnet (400) close to the second permanent magnet (300) with the N pole facing downward is an N pole, and one end of the third permanent magnet (400) close to the second permanent magnet (300) with the N pole facing upward is an S pole.

2. The permanent magnet device according to claim 1, characterized in that A non-magnetic part (210) is arranged between the first permanent magnet (200) and the adjacent second permanent magnet (300), and a gap of a preset thickness is provided between the non-magnetic part (210) and the second permanent magnet (300).

3. The permanent magnet device according to claim 2, characterized in that: The height of the non-magnetic part (210) is greater than the height of the first permanent magnet (200) and is not greater than the depth of the accommodating space (102).

4. The permanent magnet device according to claim 1, characterized in that The installation shell (100) comprises a lower shell (110) and an upper cover plate (120); the top of the lower shell (110) is provided with an installation opening (101) for cooperating with the upper cover plate (120) for installation.

5. The permanent magnet device according to claim 4, characterized in that: A ferromagnetic block (410) is sandwiched between the upper cover plate (120) and the third permanent magnet (400).

6. The permanent magnet device according to claim 5, characterized in that The ferromagnetic block (410) and the upper cover plate (120) are both ferromagnetic parts, and the ferromagnetic block (410) is welded to the bottom of the upper cover plate (120).

7. The permanent magnet device according to claim 4, characterized in that: The lower shell (110) comprises a surrounding plate (111) and a bottom cover plate (112); the surrounding plate (111) is arranged around the top of the bottom cover plate (112); and the mounting opening (101) is formed on the top of the surrounding plate (111).

8. The permanent magnet device according to claim 7, characterized in that: The length of the lower shell (110) is CC5, the width of the lower shell (110) is CC2, and CC5≥3*CC3.

9. The permanent magnet device according to any one of claims 1 to 8, characterized in that: The first permanent magnet (200), the second permanent magnet (300) and the third permanent magnet (400) are respectively integrally formed or are composed of a plurality of magnets that are attracted to each other.

10. A method for manufacturing a permanent magnet device, characterized in that: For making a permanent magnet device as claimed in any one of claims 1 to 9, comprising the steps of: S1, preparing the installation housing (100), wherein the installation housing (100) has the accommodation space (102); S2, placing two of the first permanent magnets (200) symmetrically in the accommodation space (102), wherein the N pole of one of the first permanent magnets (200) is arranged toward the S pole of the other first permanent magnet (200); S3, placing one of the second permanent magnets (300) with its N pole facing upward in the accommodation space (102), and placing the other second permanent magnet (300) with its N pole facing downward in the accommodation space (102), and the two second permanent magnets (300) are symmetrically arranged; S4, placing the third permanent magnet (400) between the two second permanent magnets (300), with the N pole of the third permanent magnet (400) facing the first permanent magnet (200) with the N pole facing downward; and wherein The N pole of the first permanent magnet (200) is arranged opposite to the N pole of the third permanent magnet (400), The S pole of another of the first permanent magnets (200) is arranged opposite to the S pole of the third permanent magnet (400).

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