Disc type permanent magnet coupling

Abstract

A disc-type synchronous permanent magnet coupling includes an active rotor yoke, an active rotor permanent magnet, a driven rotor yoke, a driven rotor permanent magnet, and an isolation block. The rotor yoke is disc-shaped, with one side fixing the connecting shaft and the other side provided with a rotor permanent magnet. An annular groove is also coaxially provided on the side of the rotor yoke where the rotor permanent magnet is provided. The active rotor yoke and the driven rotor yoke are coaxially arranged opposite to each other. The first annular groove and the second annular groove are of the same shape and size. A plurality of isolation blocks are embedded between the first annular groove and the second annular groove. The present invention bears the axial load between the two rotors of the coupling by providing an isolation block, has a compact structure and high reliability, and is suitable for occasions where the coupling has high requirements for installation space.

Description

Technical Field

[0001] The present invention generally relates to the field of shaft couplings, and more particularly to a disc-type permanent magnet coupling. Background Art

[0002] The permanent magnet coupling connects the prime mover and the working machine through the magnetic force of the permanent magnets, and uses the interaction of the magnetic fields between the permanent magnets to transmit torque without direct mechanical connection.

[0003] Compared with mechanical couplings, permanent magnetic couplings have significant advantages in reliability, adaptability, vibration isolation, service life, soft start and overload protection, etc. In addition, permanent magnetic couplings also avoid the leakage problem of dynamic seals in sealed transmission mechanical devices in the chemical, pharmaceutical, food and other industries.

[0004] For disc-type permanent magnet couplings, in order to ensure synchronous rotation of the driven rotor and the driving rotor, the magnetic attraction between the two is very large, and axial displacement of the rotor disk often occurs during operation. In addition, the centering operation of the permanent magnet coupling during installation in the prior art is difficult and cumbersome, and the centering process takes a lot of time; or too many parts are added to the original driving rotor and driven rotor to prevent axial displacement, which results in a complex structure, increased processing costs, and a greatly increased probability of failure. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a disc-type synchronous permanent magnet coupling, comprising an active rotor yoke 1, an active rotor permanent magnet 2, a driven rotor yoke 5, a driven rotor permanent magnet 4, and an isolation block 3. The active rotor yoke 1 is disc-shaped, one side of which is fixedly connected to the active shaft, and the other side of which is provided with the active rotor permanent magnet 2. The active rotor permanent magnet 2 is coaxial with the active shaft, and is arranged in an annular manner with N and S poles staggered. A first annular groove is coaxially provided on the side of the active rotor yoke 1 on which the driven rotor permanent magnet 4 is arranged. The driven rotor yoke 5 is disc-shaped, one side of which is fixedly connected to the driven shaft, and the other side of which is provided with the driven rotor permanent magnet 4. The driven rotor permanent magnet 4 is coaxial with the driven shaft, and is arranged in an annular manner with N and S poles staggered. A second annular groove is coaxially provided on the side of the driven rotor yoke 5 on which the driven rotor permanent magnet 4 is arranged. The active rotor yoke 1 and the driven rotor yoke 5 are coaxially arranged opposite to each other. The active rotor yoke 1 and the driven rotor yoke 5 are coaxially arranged relative to each other so that the first annular groove and the second annular groove correspond to each other. The first annular groove and the second annular groove have the same shape and size. A plurality of isolation blocks 3 are embedded between the first annular groove and the second annular groove.

[0006] According to one embodiment of the present invention, the isolation block 3 may be in any one of the following shapes: spherical, cylindrical, or truncated cone.

[0007] According to one embodiment of the present invention, the disc-type synchronous permanent magnet coupling further includes a retaining ring 6. The retaining ring 6 has a thickness less than the distance between the active rotor yoke 1 and the driven rotor yoke 5, and is disposed between the first annular groove and the second annular groove. The retaining ring 6 has vacancies that match the shape and size of the isolation block 3, which are evenly distributed and penetrate the upper and lower surfaces of the retaining ring 6 up and down, and are used to limit the radial displacement of the isolation block 3.

[0008] According to one embodiment of the present invention, the first annular groove and the second annular groove are located in the inner ring or the outer ring of the active rotor permanent magnet 2 and the driven rotor permanent magnet 4 .

[0009] According to one embodiment of the present invention, threaded holes are provided on the driving rotor yoke 1 and the driven rotor yoke 5 for connecting the driving shaft and the driven shaft by screws.

[0010] According to one embodiment of the present invention, the cross-sections of the first annular groove and the second annular groove may be any one of the following shapes: circular, triangular, or quadrilateral.

[0011] According to one embodiment of the present invention, the shapes of the active rotor permanent magnet 2 and the driven rotor permanent magnet 4 can be any one of the following shapes: rectangular, sector-shaped, or sector-shaped.

[0012] According to another aspect of the present invention, another disc-shaped synchronous permanent magnet coupling is provided, which is used for transmitting torque from the driving shaft to the driven shaft, and includes: a driving rotor yoke 1, a driving rotor permanent magnet 2, a driven rotor yoke 5, a driven rotor permanent magnet 4, and a center ball 7. The driving rotor yoke 1 is disc-shaped, one side of which is fixedly connected to the driving shaft, and the other side of which is provided with a driving rotor permanent magnet 2 coaxial with the driven shaft, the driving rotor permanent magnet 2 is staggered and arranged in a ring with N and S poles, and a first spherical cap-shaped recess is provided at the center of the same surface as the driven rotor permanent magnet 4. The driven rotor yoke 5 is disc-shaped, one side of which is fixedly connected to the driven shaft, and the other side of which is provided with a driven rotor permanent magnet 4 coaxial with the driven shaft, the driven rotor permanent magnet 4 is staggered and arranged in a ring with N and S poles, and a second spherical cap-shaped recess is provided at the center of the same surface as the driven rotor permanent magnet 4. The active rotor yoke 1 and the driven rotor yoke 5 are coaxially placed opposite to each other, the active rotor permanent magnet 2 and the driven rotor permanent magnet 4 are of the same shape and size, and the first annular groove and the second annular groove are of the same shape and size. The central round bead 7 is arranged between the first spherical crown-shaped depression and the second spherical crown-shaped depression to prevent the distance between the active rotor and the driven rotor from changing.

[0013] According to another aspect of the present invention, a disc-type reluctance permanent magnet coupling is provided, wherein the driven rotor permanent magnet 4 in any of the above-mentioned disc-type synchronous permanent magnet couplings is replaced with a salient pole of a ferromagnetic material.

[0014] According to another aspect of the present invention, a disc-type eddy current permanent magnet coupling is provided, wherein the driven rotor permanent magnet 4 in any of the above disc-type synchronous permanent magnet couplings is replaced with a copper ring.

[0015] The present invention provides an isolation block to bear the axial load between the two rotors of the coupling, and has a compact structure and high reliability, and is suitable for occasions where the coupling has high requirements for installation space; by providing a spherical, cylindrical or truncated cone-shaped isolation block corresponding to the arched, triangular or quadrilateral annular groove, the rolling friction of the isolation block can be used to prevent the isolation block 3 from being damaged when the coupling is subjected to load impact, thereby enhancing the reliability of the coupling. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 It is a schematic diagram of a disc-type synchronous permanent magnetic coupling;

[0018] Figure 2 It is a schematic diagram of a disc-type synchronous permanent magnetic coupling with a retaining ring;

[0019] Figure 3 It is a schematic diagram of three types of isolation blocks and annular grooves;

[0020] Figure 4 It is a schematic diagram of another disc-type synchronous permanent magnet coupling. DETAILED DESCRIPTION

[0021] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Reference numerals refer to components and technologies in the present invention so that the advantages and features of the present invention can be more easily understood when implemented in a suitable environment. The following description is a concretization of the claims of the present invention, and other specific implementations related to the claims that are not explicitly described also belong to the scope of the claims.

[0022] Figure 1 It is a schematic diagram of a disc-type synchronous permanent magnet coupling.

[0023] like Figure 1As shown, a disc-shaped synchronous permanent magnet coupling is used to transmit torque from the driving shaft to the driven shaft, comprising: a driving rotor yoke 1, a driving rotor permanent magnet 2, a driven rotor yoke 5, a driven rotor permanent magnet 4, and an isolation block 3. The driving rotor yoke 1 is disc-shaped, one side of which is fixedly connected to the driving shaft, and the other side of which is provided with a driving rotor permanent magnet 2 coaxial with the driven shaft. The driving rotor permanent magnet 2 is staggered and arranged in an annular manner with N and S poles, and a first annular groove is coaxially arranged on the same side as the driven rotor permanent magnet 4. The driven rotor yoke 5 is disc-shaped, one side of which is fixedly connected to the driven shaft, and the other side of which is provided with a driven rotor permanent magnet 4 coaxial with the driven shaft. The driven rotor permanent magnet 4 is staggered and arranged in an annular manner with N and S poles, and a second annular groove is coaxially arranged on the same side as the driven rotor permanent magnet 4. The active rotor yoke 1 and the driven rotor yoke 5 are coaxially placed opposite to each other, the active rotor permanent magnet 2 and the driven rotor permanent magnet 4 are of the same shape and size, and the first annular groove and the second annular groove are of the same shape and size. A plurality of isolation blocks 3 are evenly distributed between the first annular groove and the second annular groove to prevent the distance between the active rotor and the driven rotor from changing.

[0024] Wherein, the active rotor yoke 1 and the driven rotor yoke 5 are both in the shape of a disc, and other generalized disc types, such as an elliptical disc, can also be selected to achieve similar effects. The permanent magnets are arranged in an annular manner with N and S poles staggered, so the number of the active rotor permanent magnets 2 and the driven rotor permanent magnets 4 is the same and both are an even number. The active rotor yoke 1 and the driven rotor yoke 5 are arranged correspondingly, the active rotor permanent magnets 2 and the driven rotor permanent magnets 4 are arranged correspondingly, the first annular groove and the second annular groove are arranged correspondingly, and the corresponding arrangement here is a coaxial opposite arrangement, and the two are symmetrical about the gap where the isolation block 3 is located, thereby ensuring the smooth operation of the coupling.

[0025] The plurality of isolation blocks 3 are evenly distributed between the first annular groove and the second annular groove. The isolation blocks 3 are made of rigid materials to bear the axial load between the active rotor and the passive rotor. The radial length of the isolation blocks 3 minus twice the depth of the annular groove is equal to the width of the air gap between the two rotors, thereby controlling the size of the air gap to remain unchanged. The combination of the isolation blocks 3 and the annular groove has a compact structure and is suitable for occasions where the coupling has high requirements for installation space.

[0026] In the present invention, when the coupling operates smoothly, the isolation block 3 and the active and driven rotors rotate synchronously, and there is almost no relative displacement between the three. At this time, the isolation block 3 mainly bears the axial force to prevent the air gap from changing due to the larger magnetic force between the active and driven rotors.

[0027] When the coupling is started or braked, etc., a sudden load impact occurs, the isolation block 3 can play a buffering role, wherein preferably Figure 3The spherical, cylindrical, and truncated cone shapes shown in the figure can utilize the rolling of the ball, cylinder, or truncated cone to prevent damage to the isolation block 3 caused by load impact. When the master and slave rotors rotate relative to each other, rolling friction rather than sliding friction occurs between the isolation block 3 and the contact surface, thereby preventing damage to the isolation block 3.

[0028] When the coupling is installed for centering, since the annular groove and the isolation block 3 match and the clearance between the two permanent magnets is large, the two can be easily attracted together during centering, greatly simplifying the centering operation. It is preferred that the disc-type synchronous permanent magnet coupling further includes a retaining ring 6, and the positions of the multiple isolation blocks 3 can be conveniently controlled during centering, further simplifying the centering operation.

[0029] like Figure 1 As shown, the driving rotor yoke 1 and the driven rotor yoke 5 may be provided with threaded holes for connecting the driving shaft and the driven shaft with screws. Other connection methods suitable for connecting the rotating shafts may also be selected.

[0030] Figure 2 It is a schematic diagram of a disc-type synchronous permanent magnet coupling with a retaining ring.

[0031] like Figure 2 As shown, the disc-type synchronous permanent magnet coupling may further include a retaining ring 6. The thickness of the retaining ring 6 is less than the distance between the active rotor yoke 1 and the driven rotor yoke 5, and is disposed between the first annular groove and the second annular groove. The retaining ring 6 has vacancies that match the shape and size of the isolation block 3, which are evenly distributed and penetrate the upper and lower surfaces of the retaining ring 6 up and down, and are used to limit the radial displacement of the isolation block 3. The retaining ring 6 connects multiple isolation blocks 3 into a whole, which is convenient for unified control of all isolation blocks 3; at the same time, it limits the radial displacement of the isolation block 3 to prevent the movement of the isolation block 3 under special circumstances.

[0032] Figure 3 It is a schematic diagram of three types of isolation blocks and annular grooves.

[0033] like Figure 3 As shown, the isolation block 3 is preferably any one of the following shapes: spherical, cylindrical, or truncated cone.

[0034] like Figure 3 As shown, the cross-section of the first annular groove and the second annular groove can be any one of the following shapes: arcuate, triangular, quadrilateral. Here, arcuate, triangular, quadrilateral refers to the shape of the notch of the groove in the cross-section.

[0035] Preferably, the spherical isolation block 3 corresponds to the arcuate annular groove, such as Figure 3 As shown in the left figure; the cylindrical isolation block 3 corresponds to the quadrilateral annular groove, such as Figure 3As shown in the middle figure; the truncated cone-shaped isolation block 3 corresponds to the triangular annular groove, such as Figure 3 As shown in the left figure, it can also correspond to a trapezoidal annular groove, which is not shown in the figure. The rolling of the ball, cylinder or truncated cone can be used to prevent the damage of the isolation block 3 due to load impact. When the master and slave rotors rotate relative to each other, the isolation block 3 and the contact surface have rolling friction instead of sliding friction, which prevents the damage of the isolation block 3 without affecting the normal operation of the coupling.

[0036] According to one embodiment of the present invention, the first annular groove and the second annular groove are located in the inner ring or the outer ring of the active rotor permanent magnet 2 and the driven rotor permanent magnet 4 .

[0037] According to one embodiment of the present invention, the shapes of the active rotor permanent magnet 2 and the driven rotor permanent magnet 4 can be any one of the following shapes: rectangular, sector-shaped, sector-shaped, and annular. The shape of the permanent magnet can be rotated as needed.

[0038] The present invention provides an isolation block to bear the axial load between the two rotors of the coupling, and has a compact structure and high reliability, and is suitable for occasions where the coupling has high requirements for installation space; by providing a spherical, cylindrical or truncated cone-shaped isolation block corresponding to an arched, triangular or quadrilateral annular groove, the rolling friction of the isolation block can be used to prevent the isolation block from being damaged when the coupling is subjected to load impact, thereby enhancing the reliability of the coupling.

[0039] Figure 4 It is a schematic diagram of another disc-type synchronous permanent magnet coupling.

[0040] like Figure 4 As shown, another disc-type synchronous permanent magnet coupling is used to transmit torque from the driving shaft to the driven shaft, comprising: a driving rotor yoke 1, a driving rotor permanent magnet 2, a driven rotor yoke 5, a driven rotor permanent magnet 4, and a center ball 7. The driving rotor yoke 1 is disc-shaped, one side of which is fixedly connected to the driving shaft, and the other side of which is provided with a driving rotor permanent magnet 2 coaxial with the driven shaft. The driving rotor permanent magnet 2 is staggered and arranged in a ring with N and S poles, and a first spherical cap-shaped depression is provided at the center of the same surface as the driven rotor permanent magnet 4. The driven rotor yoke 5 is disc-shaped, one side of which is fixedly connected to the driven shaft, and the other side of which is provided with a driven rotor permanent magnet 4 coaxial with the driven shaft. The driven rotor permanent magnet 4 is staggered and arranged in a ring with N and S poles, and a second spherical cap-shaped depression is provided at the center of the same surface as the driven rotor permanent magnet 4. The active rotor yoke 1 and the driven rotor yoke 5 are coaxially placed opposite to each other, the active rotor permanent magnet 2 and the driven rotor permanent magnet 4 are of the same shape and size, and the first annular groove and the second annular groove are of the same shape and size. The central round bead 7 is arranged between the first spherical crown-shaped depression and the second spherical crown-shaped depression to prevent the distance between the active rotor and the driven rotor from changing.

[0041] In this embodiment, a central ball is used to replace multiple isolation blocks, and a central spherical crown depression is used to replace the annular groove, which has the same beneficial effects as the previous embodiment in terms of bearing axial load and ball rotation.

[0042] According to another aspect of the present invention, a disc-type reluctance permanent magnet coupling is provided, wherein the driven rotor permanent magnet 4 in any of the above-mentioned disc-type synchronous permanent magnet couplings is replaced with ferromagnetic salient poles. At this time, the interaction between the active rotor permanent magnet 2 and the ferromagnetic salient poles turns the present embodiment into a disc-type reluctance permanent magnet coupling.

[0043] According to another aspect of the present invention, a disc-type eddy current permanent magnet coupling is provided, wherein the driven rotor permanent magnet 4 in any of the above-mentioned disc-type synchronous permanent magnet couplings is replaced with a copper ring. At this time, the interaction between the active rotor permanent magnet 2 and the copper ring transforms the present embodiment into a disc-type eddy current permanent magnet coupling.

[0044] It should be noted that the above embodiments illustrate the present invention rather than limit the present invention, and those skilled in the art may design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets shall not be construed as a limitation to the claims.

Claims

1. A disc-type synchronous permanent magnetic coupling, comprising an active rotor yoke (1), an active rotor permanent magnet (2), an isolation block (3), a driven rotor permanent magnet (4), and a driven rotor yoke (5), The active rotor yoke (1) is in the shape of a disc, one side of which is fixedly connected to the active shaft, and the other side of which is provided with an active rotor permanent magnet (2); The active rotor permanent magnets (2) are arranged in a ring shape with N and S poles staggered, and are coaxial with the active shaft; A first annular groove is coaxially formed on one side of the active rotor yoke (1) on which the driven rotor permanent magnet (4) is arranged; The driven rotor yoke (5) is in the shape of a disc, one side of which is fixedly connected to the driven shaft, and the other side of which is provided with a driven rotor permanent magnet (4); The driven rotor permanent magnet (4) is coaxial with the driven shaft and arranged in a ring with N and S poles staggered; A second annular groove is coaxially formed on a surface of the driven rotor yoke (5) on which the driven rotor permanent magnet (4) is arranged; The active rotor yoke (1) and the driven rotor yoke (5) are coaxially arranged relative to each other so that the first annular groove and the second annular groove correspond to each other; The first annular groove and the second annular groove have the same shape and size; A plurality of isolation blocks (3) are embedded between the first annular groove and the second annular groove, and when the master and slave rotors rotate relative to each other, rolling friction occurs between the isolation blocks (3) and the contact surface.

2. According to the disc-type synchronous permanent magnetic coupling according to claim 1, the isolation block (3) can be any one of the following shapes: spherical, cylindrical, or truncated cone.

3. The disc-type synchronous permanent magnetic coupling according to claim 1, further comprising a retaining ring (6), The retaining ring (6) has a thickness smaller than the distance between the active rotor yoke (1) and the driven rotor yoke (5), and is arranged between the first annular groove and the second annular groove; The retaining ring (6) has spaces that match the shape and size of the isolation block (3), which are evenly distributed and penetrate the upper and lower surfaces of the retaining ring (6) vertically, and are used to limit the radial displacement of the isolation block (3).

4. The disc-type synchronous permanent magnet coupling according to claim 1, wherein the first annular groove and the second annular groove are located on the inner ring or the outer ring of the driving rotor permanent magnet (2) and the driven rotor permanent magnet (4).

5. The disc-type synchronous permanent magnet coupling according to claim 1, wherein the driving rotor yoke (1) and the driven rotor yoke (5) are provided with threaded holes for connecting the driving shaft and the driven shaft by screws. 6 . The disc-type synchronous permanent magnet coupling according to claim 1 , wherein the cross-section of the first annular groove and the second annular groove can be any one of the following shapes: circular, triangular, or quadrilateral.

7. The disc-type synchronous permanent magnet coupling according to claim 1, wherein the shapes of the driving rotor permanent magnet (2) and the driven rotor permanent magnet (4) can be any one of the following shapes: rectangular, sector-shaped, or sector-shaped.

8. A disc-type synchronous permanent magnetic coupling, comprising: an active rotor yoke (1), an active rotor permanent magnet (2), a driven rotor yoke (5), a driven rotor permanent magnet (4), and a center ball (7). The active rotor yoke (1) is in the shape of a disk, one side of which is fixedly connected to the active shaft, and the other side of which is provided with an active rotor permanent magnet (2) coaxial with the driven shaft, the active rotor permanent magnet (2) being arranged in an annular manner with N and S poles staggered, and a first spherical crown-shaped recess being provided at the center of the same surface as the driven rotor permanent magnet (4); The driven rotor yoke (5) is in the shape of a disk, one side of which is fixedly connected to the driven shaft, and the other side of which is provided with a driven rotor permanent magnet (4) coaxial with the driven shaft, the driven rotor permanent magnet (4) being arranged in an annular manner with N and S poles staggered, and a second spherical crown-shaped recess being provided at the center of the same surface as the driven rotor permanent magnet (4); The active rotor yoke (1) and the driven rotor yoke (5) are coaxially placed opposite to each other, the active rotor permanent magnet (2) and the driven rotor permanent magnet (4) are of the same shape and size, and the first spherical cap-shaped recess and the second spherical cap-shaped recess are of the same shape and size; The central round bead (7) is arranged between the first spherical cap-shaped recess and the second spherical cap-shaped recess, and is used to prevent the distance between the driving rotor and the driven rotor from changing.

9. A disc-type reluctance permanent magnet coupling, wherein the driven rotor permanent magnet (4) in the disc-type synchronous permanent magnet coupling according to any one of claims 1 to 8 is replaced by a salient pole of a ferromagnetic material.

10. A disc-type eddy current permanent magnet coupling, wherein the driven rotor permanent magnet (4) in the disc-type synchronous permanent magnet coupling according to any one of claims 1 to 8 is replaced by a copper ring.

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