Magnetic coupling

Abstract

This utility model relates to the field of coupling technology and discloses a magnetic coupling. The magnetic coupling includes a driving coupling, a driven coupling, and an isolation cover disposed between the driving coupling and the driven coupling. The driving coupling includes a first iron core and a plurality of driving permanent magnets mounted on the first iron core. The driven coupling includes a second iron core and a plurality of driven permanent magnets mounted on the second iron core. This magnetic coupling uses a fixed connecting shoulder at the end of the second iron core to directly abut against the end face of the permanent magnet, forming a rigid barrier against centrifugal force. Furthermore, by embedding the driven permanent magnets on the second iron core, compared to surface-mount mounting, the driven permanent magnet assembly is more secure, exhibiting stronger resistance to detachment under centrifugal force. This allows it to meet the transmission requirements of high speed and high torque, has a wide range of applications, and completely solves the problem of axial movement of the magnets caused by vibration during high-speed rotation.

Description

Technical Field

[0001] This utility model relates to the field of coupling technology, specifically a magnetic coupling. Background Technology

[0002] A coupling is a device that connects two shafts or a shaft and a rotating component, allowing them to rotate together during motion and power transmission, and remaining connected under normal conditions. Sometimes it is also used as a safety device to prevent the connected components from bearing excessive loads, thus providing overload protection.

[0003] Traditional permanent magnet couplings typically use surface-mounted permanent magnets, which facilitates installation and heat dissipation, but suffers from low magnetic field utilization and insufficient torque density. Especially under high-torque conditions, the number and size of permanent magnets must be increased to meet transmission requirements, resulting in a bulky overall coupling. Furthermore, existing end cap structures often employ a single-layer flat plate design, which provides insufficient axial constraint on the permanent magnets during high-speed rotation, easily leading to loosening or even detachment, thus limiting the coupling's application in high-speed scenarios. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a magnetic coupling that has the advantage of preventing detachment under high-speed operation, thus solving the problems in existing technologies.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A magnetic coupling, comprising a driving coupling, a driven coupling, and an isolation cover disposed between the driving coupling and the driven coupling. The driving coupling comprises a first iron core and a plurality of driving permanent magnets mounted on the first iron core. The driven coupling comprises a second iron core and a plurality of driven permanent magnets mounted on the second iron core. The driving permanent magnets and the driven permanent magnets achieve torque transmission through the action of a magnetic field. The second iron core is circular. The second iron core has a cylindrical structure, and multiple axially extending mounting slots are spaced apart on its outer circumferential surface. The multiple driven permanent magnets are respectively embedded in the multiple mounting slots. A driven upper end cover is fixedly connected to the axial end. The driven upper end cover extends continuously along the circumferential direction of the second iron core, and one end face of the driven upper end cover is configured to directly abut against the end face of the multiple driven permanent magnets in the first axial direction, thereby forming a first axial rigid limit for the multiple driven permanent magnets to resist centrifugal force.

[0006] The beneficial effects of this utility model are:

[0007] This magnetic coupling uses a fixed connecting shoulder at the end of the second iron core to directly abut against the end face of the permanent magnet, forming a rigid barrier against centrifugal force. Furthermore, the driven permanent magnet is embedded in the second iron core. Compared to surface-mount mounting, the driven permanent magnet assembly is more secure and has stronger resistance to detachment under centrifugal force. This allows it to meet the transmission requirements of high speed and high torque, has a wide range of applications, and completely solves the problem of axial movement of the magnet caused by vibration during high-speed rotation.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, the driven coupling also includes a driven lower end cover, which is an annular structure and is detachably fixed to the second axial end of the second iron core by a plurality of fasteners. The second axial end is disposed opposite to the first axial end. One end face of the driven lower end cover is configured to directly abut against the end face of the plurality of driven permanent magnets in the second axial direction, thereby working together with the driven upper end cover to form bidirectional axial clamping and fixing of the plurality of driven permanent magnets.

[0010] The beneficial effect of adopting the above-mentioned further solution is that, through the coordinated action of the detachable lower end cover and the shoulder, the permanent magnet is axially locked in both directions by pre-tightening the bolts. This design not only ensures structural stability at high speeds but also facilitates magnet replacement during maintenance, significantly improving the maintainability of the equipment.

[0011] Furthermore, the first iron core is a hollow cylindrical structure, and the plurality of active permanent magnets are mounted on the inner circumferential wall of the first iron core; the first iron core is fixedly connected to an integrated baffle at its first axial end, the integrated baffle and the first iron core are of the same material and integral structure, the outer wall of the integrated baffle is provided with an annular flange, and the inner wall of the plurality of active permanent magnets is provided with an annular groove that cooperates with the annular flange. The annular flange is embedded in the annular groove to realize the circumferential positioning and first axial limitation of the plurality of active permanent magnets.

[0012] The beneficial effect of adopting the above-mentioned further solution is that, through the embedded cooperation between the annular flange of the first iron core and the groove of the permanent magnet, millimeter-level precise positioning of the magnet is achieved. This eliminates the assembly errors of traditional adhesive bonding processes and ensures uniform and stable torque transmission.

[0013] Furthermore, the active coupling also includes an active upper pressure cover, which is an annular structure and is detachably fixed to the first axial end face of the first iron core by a plurality of fasteners. The lower end face of the active upper pressure cover abuts against the first axial end face of the plurality of active permanent magnets, thereby providing a second axial limit for the plurality of active permanent magnets. The active upper pressure cover is a non-magnetic material cover.

[0014] The beneficial effect of adopting the above-mentioned further solution is that by using a non-magnetic material for the upper end cover, axial restraint is provided while blocking the leakage magnetic circuit formed by magnetic flux through the end cover, effectively reducing eddy current loss and improving system energy efficiency.

[0015] Furthermore, the active coupling also includes a retaining ring fixed to the second axial end of the first iron core. The retaining ring is used to provide a second axial limit for the plurality of active permanent magnets. The outer diameter of the retaining ring is provided with a stepped step, and the stepped step forms a transition fit with the inner wall of the second axial end of the first iron core to ensure the coaxiality of the retaining ring and the first iron core. The stepped end face of the retaining ring is welded to the second axial end face of the first iron core.

[0016] Furthermore, the inner diameter of the retaining ring is larger than the inner diameter of the inner circumference formed by the plurality of active permanent magnets, thereby forming a non-magnetic gap between the inner ring of the retaining ring and the inner ring of the active permanent magnet to avoid forming a magnetic circuit and reduce magnetic flux leakage; the retaining ring is made of a non-magnetic material.

[0017] The beneficial effect of adopting the above-mentioned further solution is that the stepped retaining ring is permanently coaxially fixed by welding, and its inner diameter is larger than that of the permanent magnet to form a non-magnetic gap. This dual design ensures structural strength while minimizing magnetic flux leakage.

[0018] Furthermore, the isolation cover is a non-magnetic material cylinder with a "U" shaped cross-sectional profile, and the lower opening edge of the isolation cover is sealed to the equipment base; the magnetic coupling also includes an annular pressure plate, which has a plurality of through holes evenly provided along its circumference. The annular pressure plate is configured to press the upper opening edge of the isolation cover, and is connected to the corresponding threaded hole on the equipment base by a plurality of screws passing through the through holes, thereby fastening the upper edge of the isolation cover by applying an axial preload.

[0019] The beneficial effect of adopting the above-mentioned further solution is that the U-shaped cross-section isolation cover, combined with the annular pressure plate pre-tightening mechanism, adaptively compensates for thermal deformation through axial stress. Compared with the planar sealing structure, this significantly improves the sealing reliability under extreme operating conditions.

[0020] Furthermore, the plurality of active permanent magnets are arranged closely together along the circumferential direction on the inner circumferential wall of the first iron core, so that the sides of two adjacent active permanent magnets fit together; the plurality of driven permanent magnets are arranged at intervals along the circumferential direction on the outer circumferential surface of the second iron core, so that an installation and buffer gap is reserved between the sides of two adjacent driven permanent magnets.

[0021] The beneficial effect of adopting the above-mentioned further solution is that the reserved buffer gap avoids the concentration of thermal expansion stress and extends the life of the magnet.

[0022] Furthermore, the plurality of active permanent magnets are arranged in close proximity along the circumferential direction on the inner circumferential wall of the first iron core, such that the sides of two adjacent active permanent magnets are in contact with each other; the plurality of driven permanent magnets are arranged in close proximity along the circumferential direction on the outer circumferential surface of the second iron core, such that the sides of two adjacent driven permanent magnets are in contact with each other.

[0023] The advantage of adopting the above-mentioned further scheme is that it maximizes the magnetic pole area and increases the torque density.

[0024] Furthermore, the plurality of active permanent magnets are arranged at intervals along the circumferential direction on the inner circumferential wall of the first iron core, such that a gap is reserved between the sides of two adjacent active permanent magnets; the plurality of driven permanent magnets are arranged at intervals along the circumferential direction on the outer circumferential surface of the second iron core, such that a gap is reserved between the sides of two adjacent driven permanent magnets; both the active and driven permanent magnets are magnetized along the axial direction, and the magnetization directions are exactly the same.

[0025] The beneficial effect of adopting the above-mentioned further scheme is that the uniform magnetic field distribution reduces vibration noise. Attached Figure Description

[0026] Figure 1 This is a radial cross-sectional view of the magnetic coupling according to an embodiment of the present invention.

[0027] Figure 2 This is a schematic diagram of a single magnet slot structure of the driving coupling of the magnetic coupling according to an embodiment of the present invention;

[0028] Figure 3 This is an axial cross-sectional view of an example of a magnetic coupling according to an embodiment of this utility model;

[0029] Figure 4 This is an axial cross-sectional view of Example 2 of the magnetic coupling of this utility model;

[0030] Figure 5 This is an axial cross-sectional view of Example 3 of the magnetic coupling of this utility model;

[0031] Figure 6 This is a longitudinal cross-sectional view of Example 4 of the magnetic coupling of this utility model.

[0032] Figure label:

[0033] 1. Active coupling; 111. First iron core; 112. Active permanent magnet; 113. Active upper pressure cover; 114. Active lower cover plate; 2. Isolation cover; 3. Driven coupling; 311. Second iron core; 312. Driven permanent magnet; 313. Upper end cover; 314. Lower end cover; 4. Pressure plate. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] Example 1, by Figure 1-3A magnetic coupling is provided, comprising a driving coupling 1, a driven coupling 3, and an isolation cover 2 disposed between the driving coupling 1 and the driven coupling 3. The driving coupling 1 includes a first iron core 111 and a plurality of driving permanent magnets 112 mounted on the first iron core 111. The driven coupling 3 includes a second iron core 311 and a plurality of driven permanent magnets 312 mounted on the second iron core 311. The driving permanent magnets 112 and the driven permanent magnets 312 achieve torque transmission through the action of a magnetic field. The second iron core 311 has a cylindrical structure, and Multiple axially extending mounting slots are spaced at intervals along the circumferential direction on the outer circumferential surface of the second iron core 311, and multiple driven permanent magnets 312 are respectively embedded in the multiple mounting slots. A driven upper end cover 313 is fixedly connected to the axial end, and the driven upper end cover 313 extends continuously along the circumferential direction of the second iron core 311. One end face of the driven upper end cover 313 is configured to directly abut against the end face of the multiple driven permanent magnets 312 in the first axial direction, thereby forming a first axial rigid limit for the multiple driven permanent magnets 312 to resist centrifugal force. This magnetic coupling directly abuts against the end face of the permanent magnet through the fixed connecting shoulder at the end of the second iron core 311, forming a rigid barrier against centrifugal force. Compared with the traditional bolt-fixed structure, it completely solves the problem of axial movement of the magnets caused by vibration during high-speed rotation. The driven coupling 3 also includes a driven lower end cover 314, which is an annular structure and detachably fixed to the second axial end of the second iron core 311 by multiple fasteners. The second axial end is positioned opposite to the first axial end. One end face of the driven lower end cover 314 is configured to directly abut against the end faces of multiple driven permanent magnets 312 in the second axial direction, thereby working together with the driven upper end cover 313 to form a bidirectional axial clamping and fixing of the multiple driven permanent magnets 312. Through the coordinated action of the detachable lower end cover and the shoulder, the permanent magnets are axially locked in both directions by bolt pre-tightening. This design ensures structural stability at high speeds and facilitates magnet replacement during maintenance, significantly improving equipment maintainability. The first iron core 111 is a hollow cylindrical structure, and multiple active permanent magnets 112 are mounted on the inner circumferential wall of the first iron core 111. The active coupling 1 also includes an active upper pressure cover 113, which is an annular structure and is detachably fixed to the first axial end face of the first iron core 111 by multiple fasteners. The lower end face of the active upper pressure cover 113 abuts against the first axial end face of the multiple active permanent magnets 112, thereby providing a second axial limit for the multiple active permanent magnets 112. The active upper pressure cover 113 is a cover made of non-magnetic material. By using an upper cover made of non-magnetic material, axial limit is provided while blocking the leakage magnetic circuit formed by magnetic flux through the end cover, effectively reducing eddy current loss and improving system energy efficiency.The active coupling 1 also includes a retaining ring fixed to the second axial end of the first iron core 111. The retaining ring provides a second axial limit for the multiple active permanent magnets 112. The outer diameter of the retaining ring has a stepped step, which forms a transition fit with the inner wall of the second axial end of the first iron core 111 to ensure the coaxiality of the retaining ring and the first iron core 111. The stepped end face of the retaining ring is welded to the second axial end face of the first iron core 111. The inner diameter of the retaining ring is larger than the inner diameter of the inner circumference formed by the multiple active permanent magnets 112, thereby forming a non-magnetic gap between the inner ring of the retaining ring and the inner ring of the active permanent magnets 112 to avoid forming a magnetic circuit and reduce magnetic flux leakage. The retaining ring is made of a non-magnetic material. The stepped retaining ring is permanently coaxially fixed by welding, and its inner diameter is larger than the permanent magnets to form a non-magnetic gap. This dual design ensures structural strength while minimizing magnetic flux leakage. The isolation cover 2 is a non-magnetic cylindrical material such as resin or fiberglass with a "U"-shaped cross-sectional profile. The lower opening edge of the isolation cover 2 is sealed to the equipment base. The magnetic coupling also includes an annular pressure plate with multiple through holes evenly distributed along its circumference. The annular pressure plate is configured to press against the upper opening edge of the isolation cover 2 and is connected to the corresponding threaded holes on the equipment base by multiple screws passing through the through holes, thereby securing the upper edge of the isolation cover 2 by applying axial preload. The U-shaped cross-section isolation cover 2, combined with the annular pressure plate preload mechanism, adaptively compensates for thermal deformation through axial stress. Compared with a planar sealing structure, this significantly improves the sealing reliability under extreme operating conditions.

[0036] Example 2, please refer to Figure 4 This embodiment is a further optimization based on Embodiment 1. The parts that are the same as those described above will not be repeated here. Figure 1-3 As shown, to further better realize this utility model, the following arrangement is specifically adopted:

[0037] Multiple active permanent magnets 112 are arranged closely together along the circumferential direction on the inner circumferential wall of the first iron core 111, so that the sides of two adjacent active permanent magnets 112 fit together; multiple driven permanent magnets 312 are arranged at intervals along the circumferential direction on the outer circumferential surface of the second iron core 311, so that there is a reserved installation and buffer gap between the sides of two adjacent driven permanent magnets 312.

[0038] Example 3, please refer to Figure 5 Multiple active permanent magnets 112 are arranged closely together along the circumferential direction on the inner circumferential wall of the first iron core 111, so that the sides of two adjacent active permanent magnets 112 are in contact with each other; multiple driven permanent magnets 312 are arranged closely together along the circumferential direction on the outer circumferential surface of the second iron core 311, so that the sides of two adjacent driven permanent magnets 312 are in contact with each other.

[0039] Example 4, please refer to Figure 6The first iron core 111 has an integrated baffle fixedly connected to its first axial end. The integrated baffle and the first iron core 111 are of the same material and are integrally formed. The outer wall of the integrated baffle has an annular flange, and the inner walls of the multiple active permanent magnets 112 have corresponding annular grooves that mate with the annular flange. The annular flange is embedded in the annular groove to achieve circumferential positioning and first axial limitation of the multiple active permanent magnets 112. Through the embedded cooperation between the annular flange of the first iron core 111 and the groove of the permanent magnet, the magnets are positioned with millimeter-level precision. This eliminates the assembly errors of traditional adhesive bonding processes and ensures uniform and stable torque transmission. Multiple active permanent magnets 112 are arranged at intervals along the circumferential direction on the inner circumferential wall of the first iron core 111, leaving a gap between the sides of two adjacent active permanent magnets 112; multiple driven permanent magnets 312 are arranged at intervals along the circumferential direction on the outer circumferential surface of the second iron core 311, leaving a gap between the sides of two adjacent driven permanent magnets 312; both active and driven permanent magnets 112 are magnetized axially, and the magnetization directions are exactly the same. The outer diameter of the baffle is integrally formed with the inner wall of the first iron core 111 without any fitting gap, forming a rigid support. The outer wall of the baffle is provided with an annular flange, which forms a tight fit with the pre-made groove on the inner wall of the active permanent magnets 112, that is, the baffle flange is embedded in the permanent magnet groove, realizing the circumferential positioning and axial lower end limitation of the active permanent magnets 112. The active permanent magnet 112 is a convex groove-shaped permanent magnet, closely arranged along the circumference of the inner wall of the first iron core 111. Both the active permanent magnet 112 and the driven permanent magnet 312 are composed of permanent magnets with the same polarity. The lower axial end of the permanent magnet is axially supported by a baffle flange, and the tight fit between the inner wall convex groove and the baffle restricts its radial displacement. The upper end cover of the active coupling 1 retains the traditional ring structure material, which is a non-magnetic material. It is fixed to the upper end face of the first iron core 111 by screws evenly distributed along the circumference, forming an axial upper end constraint on the permanent magnet, which, together with the baffle, achieves bidirectional axial fixation of the permanent magnet. A retaining ring replaces the active lower cover plate 114. The outer diameter of the retaining ring has a stepped step, which forms a transition fit with the lower inner wall of the first iron core 111 to ensure the coaxiality of the retaining ring and the iron core. The inner diameter of the retaining ring is larger than the inner diameter of the active permanent magnet 112 to avoid the inner ring of the retaining ring from forming a magnetic circuit with the inner ring of the permanent magnet, thus reducing magnetic leakage. The stepped end face of the retaining ring is fixed to the lower end face of the first iron core 111 by argon arc welding, replacing the screw connection of the traditional lower end cover, thus eliminating the need for screws and corresponding installation procedures.

[0040] The second iron core 311 adopts a cylindrical structure made of carbon steel. Its outer circumference has multiple convex cross-section grooves spaced axially along its outer periphery for mounting the driven permanent magnet 312. At the upper end of the second iron core 311, there is an annular shoulder integrally formed with the iron core. This shoulder extends continuously along the circumference of the iron core. When the driven permanent magnet 312 is inserted into the mounting groove, the shoulder directly abuts against the end face of the magnet from the top, forming a rigid limit and counteracting the axial movement tendency of the magnet caused by centrifugal force during high-speed rotation, thus structurally preventing the magnet from falling off.

[0041] In Embodiment 1, the upper end cover 313 and the lower end cover 314 of the driven coupling are bolted together to clamp the magnets from both axial ends. In this design, the newly added annular shoulder on the iron core has replaced the core function of the upper end cover: the annular shoulder is integrally formed with the iron core, and its strength is much higher than that of a split end cover. It can withstand greater axial impact force, especially at high speeds, where the axial force converted from centrifugal force is more significant. This simplifies the assembly process and eliminates the need to align the threaded holes of the upper end cover and the iron core.

[0042] After the magnet is embedded in the mounting slot, the upper axial end is held in place by an annular shoulder that is integral with the iron core. The connection between the lower end cover and the iron core remains unchanged. Screws evenly distributed along the circumference pass through the lower end cover and engage with the threaded holes of the iron core, thus clamping the magnet from the other axial end.

[0043] In addition, the common driven coupling structure usually involves attaching the driven permanent magnet to the surface of the second iron core 311. When the driven coupling rotates at high speed, it generates a large centrifugal force, and the driven permanent magnet mounted on the second iron core 311 is at risk of falling off under the action of centrifugal force. However, this application embeds the driven permanent magnet into the second iron core 311. Compared with the surface mounting method, the driven permanent magnet 32 ​​is more firmly assembled and has a stronger resistance to falling off under the action of centrifugal force. This can meet the transmission requirements of high speed and high torque and has a wide range of applications.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0045] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A magnetic coupling, comprising a driving coupling (1), a driven coupling (3), and an isolation cover (2) disposed between the driving coupling (1) and the driven coupling (3), wherein the driving coupling (1) comprises a first iron core (111) and a plurality of driving permanent magnets (112) mounted on the first iron core (111), and the driven coupling (3) comprises a second iron core (311) and a plurality of driven permanent magnets (312) mounted on the second iron core (311), wherein the driving permanent magnets (112) and the driven permanent magnets (312) transmit torque through a magnetic field, characterized in that: The second iron core (311) is a cylindrical structure, and a plurality of axially extending mounting slots are provided at intervals along its circumferential direction on the outer circumferential surface of the second iron core (311), and the plurality of driven permanent magnets (312) are respectively embedded in the plurality of mounting slots; The second iron core (311) is fixedly provided with a driven upper end cover (313) at its first axial end. The driven upper end cover (313) extends continuously along the circumferential direction of the second iron core (311), and one end face of the driven upper end cover (313) is configured to directly abut against the end face of the plurality of driven permanent magnets (312) in the first axial direction.

2. The magnetic coupling of claim 1, wherein, The driven coupling (3) further includes a driven lower end cover (314), which is an annular structure and is detachably fixed to the second axial end of the second iron core (311) by a plurality of fasteners. The second axial end is disposed opposite to the first axial end. One end face of the driven lower end cover (314) is configured to directly abut against the end face of the plurality of driven permanent magnets (312) in the second axial direction, thereby working together with the driven upper end cover (313) to form bidirectional axial clamping and fixing of the plurality of driven permanent magnets (312).

3. The magnetic coupling according to claim 1 or 2, characterized in that The first iron core (111) is a hollow cylindrical structure, and the plurality of active permanent magnets (112) are installed on the inner circumferential wall of the first iron core (111). The first iron core (111) is fixedly connected to an integrated baffle at its first axial end. The integrated baffle and the first iron core (111) are of the same material and are integral structures. The outer wall of the integrated baffle is provided with an annular flange, and the inner wall of the plurality of active permanent magnets (112) is provided with an annular groove that cooperates with the annular flange. The annular flange is embedded in the annular groove.

4. The magnetic coupling of claim 3, wherein, The active coupling (1) further includes an active upper pressure cover (113), which is an annular structure and is detachably fixed to the first axial end face of the first iron core (111) by a plurality of fasteners. The lower end face of the active upper pressure cover (113) abuts against the first axial end face of the plurality of active permanent magnets (112), thereby providing a second axial limit for the plurality of active permanent magnets (112). The active upper pressure cover (113) is a non-magnetic material cover.

5. The magnetic coupling of claim 3, wherein, The active coupling (1) further includes a retaining ring fixed to the second axial end of the first iron core (111), the retaining ring being used to provide a second axial limit for the plurality of active permanent magnets (112); the outer diameter of the retaining ring is provided with a stepped step, the stepped step forming a transition fit with the inner wall of the second axial end of the first iron core (111) to ensure the coaxiality of the retaining ring and the first iron core (111); the stepped end face of the retaining ring is welded to the second axial end face of the first iron core (111).

6. The magnetic coupling according to claim 5, characterized in that, The inner diameter of the retaining ring is larger than the inner diameter of the inner circumference formed by the plurality of active permanent magnets (112), thereby forming a non-magnetic gap between the inner ring of the retaining ring and the inner ring of the active permanent magnet (112).

7. The magnetic coupling of claim 1, wherein, The isolation cover (2) is a non-magnetic material cylinder with a "U" shaped cross-sectional profile. The lower opening edge of the isolation cover (2) is sealed to the equipment base. The magnetic coupling also includes an annular pressure plate. The annular pressure plate is uniformly provided with multiple through holes along its circumference. The annular pressure plate is configured to press the upper opening edge of the isolation cover (2) and is screwed into the corresponding threaded hole on the equipment base by multiple screws passing through the through holes.

8. The magnetic coupling of claim 1, wherein, The plurality of active permanent magnets (112) are arranged closely together along the circumferential direction on the inner circumferential wall of the first iron core (111), so that the sides of two adjacent active permanent magnets (112) are in contact with each other; the plurality of driven permanent magnets (312) are arranged at intervals along the circumferential direction on the outer circumferential surface of the second iron core (311).

9. The magnetic coupling of claim 1, wherein, The plurality of active permanent magnets (112) are arranged in close proximity along the circumferential direction on the inner circumferential wall of the first iron core (111), such that the sides of two adjacent active permanent magnets (112) are in close contact with each other; the plurality of driven permanent magnets (312) are arranged in close proximity along the circumferential direction on the outer circumferential surface of the second iron core (311).

10. The magnetic coupling of claim 1, wherein, The plurality of active permanent magnets (112) are arranged at intervals along the circumferential direction on the inner circumferential wall of the first iron core (111), such that a gap is reserved between the sides of two adjacent active permanent magnets (112); the plurality of driven permanent magnets (312) are arranged at intervals along the circumferential direction on the outer circumferential surface of the second iron core (311), such that a gap is reserved between the sides of two adjacent driven permanent magnets (312); both the active permanent magnets (112) and the driven permanent magnets (312) are magnetized along the axial direction, and the magnetization directions are exactly the same.

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