Permanent magnet eddy current transmission device with fully sealed cylindrical structure

Abstract

The present invention proposes a permanent magnet eddy current transmission device, comprising: a vortex ring, which is generally a cylindrical structure with a circumferential seal, one end of which has a blind hole cavity for accommodating an output shaft; a permanent magnet ring, which is generally a cylindrical structure with a circumferential seal and is sleeved within the vortex ring, one end of which has a blind hole cavity for accommodating an input shaft; and two locking sleeves, respectively sleeved within the two blind hole cavities, with the output shaft connected to the vortex ring via one locking sleeve, and the input shaft connected to the permanent magnet ring via another locking sleeve. This device solves the problems of permanent magnet eddy current transmission devices with open disc structures, such as large radial dimensions, large moment of inertia, and slow dynamic response during starting and braking. It also solves the problem that open disc structures cannot operate in liquid environments such as water and oil, and that when operating in corrosive gas environments, the open structure easily causes internal parts to rust, reducing reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of permanent magnet eddy current transmission devices, and in particular to a permanent magnet eddy current transmission device with a fully sealed cylindrical structure. Background Art

[0002] Currently, common types of mechanical transmission include mechanical transmission, hydraulic coupling transmission, magnetic coupling transmission, etc. Among them, magnetic coupling transmission is widely used due to its characteristics of flexible transmission, vibration isolation and energy saving.

[0003] However, existing permanent magnet eddy current transmission devices are all disc-type open structures (such as Figure 1 There are many problems with this method. First, the radial size is large, the moment of inertia is large, and the dynamic response of the product during starting and braking is slow. Second, in high-speed applications, the dynamic balancing accuracy of the disc structure is higher, and the processing cost is high. Third, the disc structure is an open structure and cannot work in liquid environments such as water and oil. When working in a corrosive gas environment, the open product structure is very likely to cause rust on internal parts, reducing reliability. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems, the present invention provides a permanent magnet eddy current transmission device with a fully sealed cylindrical structure, which solves the technical difficulties of the permanent magnet eddy current transmission device with a disc-type open structure, such as large radial size, large moment of inertia, slow dynamic response of the product during starting and braking, and higher dynamic balancing accuracy requirements and high processing costs in high-speed applications; at the same time, it solves the technical problem that the disc-type structure is an open structure and cannot work in liquid environments such as water and oil. When working in a corrosive gas environment, the open product structure easily causes internal parts to rust, thereby reducing reliability.

[0005] The present application discloses a permanent magnet eddy current transmission device of a fully sealed cylindrical structure, which comprises:

[0006] A swirl ring, which is generally a cylindrical structure with a circumferential side seal, and one end of the swirl ring has a blind hole cavity for accommodating the output shaft;

[0007] A permanent magnet ring, which is generally a cylindrical structure with a sealed circumference and is sleeved in the eddy current ring. One end of the permanent magnet ring has a blind hole cavity for accommodating the input shaft;

[0008] The two locking sleeves are respectively sleeved on the two blind hole cavities. The output shaft is connected to the eddy current ring through one locking sleeve, and the input shaft is connected to the permanent magnet ring through the other locking sleeve.

[0009] In some embodiments, the swirl ring further comprises:

[0010] a cylindrical yoke;

[0011] A cylindrical copper ring, nested in the copper yoke;

[0012] an input flange, sealingly disposed on one end side of the cylindrical yoke;

[0013] An output flange is sealed and arranged on the other end side of the cylindrical yoke.

[0014] In some embodiments, the inner circle of the output flange is a blind hole structure, forming the blind hole cavity for accommodating the output shaft.

[0015] In some embodiments, the permanent magnet ring further comprises:

[0016] A cylindrical back iron having a plurality of axial grooves arranged on the outer side of the cylinder;

[0017] a plurality of permanent magnets, nested in the groove;

[0018] A sealing shaft, whose inner circle is a blind hole structure, forms the blind hole cavity for accommodating the input shaft, and the proximal end surface of the outer cylindrical side of the retaining ring and the sealing shaft is provided with an annular stop portion, which is arranged between the input flange and the back iron end surface.

[0019] In some embodiments, the permanent magnet ring further comprises:

[0020] A retaining ring is provided between the output flange and the other end surface of the back iron, and the stopper and the retaining ring press the back iron and the permanent magnet to limit the axial movement of the back iron and the permanent magnet in the eddy current ring.

[0021] In some embodiments, the input flange and the output flange are respectively positioned and fixed to the two end surfaces of the yoke by means of stoppers, and screws, and sealing gaskets are provided on the contact surfaces.

[0022] In some embodiments, the yoke and the copper ring are interference fit.

[0023] In some embodiments, the contact surface between the sealing shaft and the input flange adopts a mechanical sealing structure.

[0024] In some embodiments, the permanent magnet is a trapezoidal structure that is narrow on the outside and wide on the inside, the groove is a trapezoidal slot corresponding to the permanent magnet structure, and the permanent magnet is nested and installed in the trapezoidal slot.

[0025] In some embodiments, the back iron is formed by laminating silicon steel sheets.

[0026] Compared with the prior art, the advantages and positive effects of the present invention are:

[0027] 1. The fully sealed cylindrical permanent magnet eddy current transmission device provided by the present invention completely seals the product parts inside the cylindrical shell through sealing gaskets, mechanical seals and other components, preventing the intrusion of water, oil and corrosive gases, and the product has better rust resistance.

[0028] 2. The fully sealed cylindrical permanent magnet eddy current transmission device provided by the present invention has a cylindrical structure, a small radial dimension, a low moment of inertia, and better adaptability in high-speed applications. The cylindrical outer wall of the device is smooth, without exposed screws, gaskets and other parts, and has low rotational resistance, which can adapt to liquid working environments. The device reduces the heat energy consumption of the product, facilitates processing and production, and reduces manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 It is a structural diagram of an existing permanent magnet eddy current transmission device;

[0031] Figure 2 An exploded view of the three-dimensional structure of a permanent magnet eddy current transmission device with a fully sealed cylindrical structure according to an embodiment of the present invention;

[0032] Figure 3 A structural cross-sectional view of a permanent magnet eddy current transmission device with a fully sealed cylindrical structure according to an embodiment of the present invention;

[0033] Figure 4 3D exploded view of the eddy current ring structure in the permanent magnet eddy current transmission device according to an embodiment of the present invention;

[0034] Figure 5 A cross-sectional view of the eddy current ring structure in a permanent magnet eddy current transmission device according to an embodiment of the present invention;

[0035] Figure 6 3D exploded view of the permanent magnet ring structure in the permanent magnet eddy current transmission device according to an embodiment of the present invention;

[0036] in:

[0037] 1. Eddy current ring; 11. Cylindrical yoke; 12. Cylindrical copper ring; 13. Input flange; 14. Output flange; 2. Permanent magnet ring; 21. Cylindrical back iron; 22. Permanent magnet; 23. Sealing shaft; 24. Retaining ring; 3. Output shaft; 4. Input shaft; 5. Mechanical seal structure; 51. First O-ring; 52. Static friction plate; 53. Second O-ring; 54. Dynamic friction plate; 55. Compression spring; 61. First locking sleeve; Second locking sleeve 62. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0039] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0040] In addition, the terms "first," "second," and so on, used in this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one of these features.

[0041] This application discloses a permanent magnet eddy current transmission device with a fully sealed cylindrical structure. Figure 2 This is an exploded view of the three-dimensional structure of the permanent magnet eddy current transmission device with a fully sealed cylindrical structure in this application. Figure 3 This is a cross-sectional view of the structure of the permanent magnet eddy current transmission device with a fully sealed cylindrical structure of the present application; Figure 2-3 As shown, the device includes:

[0042] A vortex ring 1 is generally a cylindrical structure with a circumferential side seal, and one end side of the vortex ring 1 has a blind hole cavity for accommodating the output shaft 3; a permanent magnet ring 2 is generally a cylindrical structure with a circumferential side seal, and is sleeved in the vortex ring 1, and one end side of the permanent magnet ring 2 has a blind hole cavity for accommodating the input shaft 4; two locking sleeves are respectively sleeved in the two blind hole cavities, the output shaft 3 is connected to the vortex ring 1 through a locking sleeve, which is a first locking sleeve 61, and the input shaft 4 is connected to the permanent magnet ring 2 through another locking sleeve, which is a second locking sleeve 62; in this embodiment, the axial space between the input shaft 4 and the output shaft 3 is utilized for installation.

[0043] Among them, such as Figure 4-5As shown, the vortex ring 1 further includes: a cylindrical yoke 11; a cylindrical copper ring 12; nested in the copper yoke 11; an input flange 13, sealed at one end of the cylindrical yoke 11; and an output flange 14, sealed at the other end of the cylindrical yoke 11.

[0044] Specifically, the inner circle of the output flange 14 is a blind hole structure to achieve sealing, forming the blind hole cavity for accommodating the output shaft 3 .

[0045] Among them, such as Figure 6 As shown, the permanent magnet ring 2 further includes: a cylindrical back iron 21, a plurality of axial grooves are provided on the outer side of the cylinder; a plurality of permanent magnets 22 are nested in the grooves; a sealing shaft 23, the inner circle of which is a blind hole structure, which realizes sealing and forms the blind hole cavity for accommodating the input shaft 4, and the proximal end surface of the outer cylindrical side of the retaining ring 24 and the sealing shaft 23 is provided with an annular stop portion, and the stop portion is provided between the input flange 13 and the end face of the back iron 21.

[0046] In this application, the permanent magnet uses a high-strength neodymium iron boron permanent magnet. The permanent magnet 22 is a trapezoidal structure that is narrow on the outside and wide on the inside. The groove is a trapezoidal groove corresponding to the permanent magnet structure. The groove is an axial groove and is arranged on the outside of the cylindrical back iron 21. The permanent magnet 22 is nested and installed in the trapezoidal groove; the back iron 21 is made of stacked silicon steel sheets, and the thickness of the silicon steel sheets is 0.35 mm. The back iron is stacked with 0.35 mm thick cold-stamped silicon steel sheets, which can reduce the generation of eddy currents in the iron core, reduce the heat generation energy consumption of the product, and facilitate processing and production, reducing manufacturing costs.

[0047] Wherein, the permanent magnet ring further comprises:

[0048] A retaining ring 24 is provided between the output flange 14 and the other end face of the back iron 21. The stopper and the retaining ring 24 compress the back iron 21 and the permanent magnet 22, limiting the axial movement of the back iron 21 and the permanent magnet 22 within the vortex ring 1. In the present application, the sealing shaft and the retaining ring are located on both sides of the back iron. Specifically, the silicon steel sheet is compressed by a long stud, thereby ensuring the structural shape and mechanical strength of the back iron, while limiting the axial displacement of the permanent magnet.

[0049] The input flange 13 and the output flange 14 are respectively positioned and fixed to the two end surfaces of the yoke 11 through stoppers and screws, and elastic rubber pads are provided on the contact surfaces for sealing.

[0050] Among them, the yoke 11 and the copper ring 12 are interference fit, and the yoke and the copper ring are interference fit, and are installed by a heat-installation process. Since the eddy current ring has a temperature rise during operation, the thermal expansion coefficient of the copper ring is greater than that of the yoke. As the temperature rises, the fitting force of the component will also increase, thereby ensuring structural stability. In this application, the yoke and the copper ring are not connected and fixed by screws, rivets, etc.

[0051] Specifically, the contact surface between the sealing shaft 23 and the input flange 13 adopts a mechanical seal structure 5, which is composed of a first O-ring 51, a static friction plate 52, a second O-ring 53, a dynamic friction plate 54 and a compression spring 55. The mechanical seal is a standard part and is easy to purchase.

[0052] The permanent magnet eddy current transmission device with a fully sealed cylindrical structure provided in the embodiment of the present application is a cylindrical structure with a small diameter and low moment of inertia, and has better adaptability in high-speed applications; the cylindrical outer wall of the device is smooth, without exposed parts such as screws and gaskets, and has low rotational resistance, and can work in a liquid environment; the device is a fully sealed structure, by installing rubber sealing gaskets between the input flange and the yoke, and between the output flange and the yoke, and installing a mechanical seal between the sealing shaft and the input flange, the output flange and the sealing shaft end face are both blind hole sealing structures, which can ensure that the inner cavity of the device is sealed and isolated from the outside world to prevent the intrusion of water, oil and corrosive gases.

[0053] The above description is merely a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any person skilled in the art may utilize the technical contents disclosed above to change or modify them into equivalent embodiments with equivalent changes for application in other fields. However, any simple modification, equivalent change, and modification of the above embodiments made in accordance with the technical essence of the present invention without departing from the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A permanent magnet eddy current transmission device with a fully sealed cylindrical structure, characterized in that: The permanent magnet eddy current transmission device comprises: A swirl ring, which is generally a cylindrical structure with a circumferential side seal, and one end of the swirl ring has a blind hole cavity for accommodating the output shaft; A permanent magnet ring, which is generally a cylindrical structure with a sealed circumference and is sleeved in the eddy current ring. One end of the permanent magnet ring has a blind hole cavity for accommodating the input shaft; Two locking sleeves are respectively placed in the two blind hole cavities, the output shaft is connected to the eddy current ring through one locking sleeve, and the input shaft is connected to the permanent magnet ring through the other locking sleeve; The vortex ring further comprises: a cylindrical yoke; A cylindrical copper ring, nested in the cylindrical yoke; an input flange, sealingly disposed on one end side of the cylindrical yoke; an output flange, sealingly disposed on the other end side of the cylindrical yoke, wherein a portion of the outer surface of the input flange is recessed and extended toward the output flange to form a blind hole cavity for accommodating the input shaft, and a portion of the outer surface of the output flange is recessed and extended toward the input flange to form a blind hole cavity for accommodating the output shaft; The permanent magnet ring further comprises: A cylindrical back iron having a plurality of axial grooves arranged on the outer side of the cylinder; a plurality of permanent magnets nested in the groove; a retaining ring, disposed between the output flange and the other end surface of the back iron; A sealing shaft, whose inner circle is a blind hole structure, forming the blind hole cavity for accommodating the input shaft, the retaining ring and the proximal end surface of the outer cylindrical side of the sealing shaft are provided with an annular stop portion, the annular stop portion is arranged between the input flange and the back iron end face, the annular stop portion and the retaining ring press the back iron and the permanent magnet, and limit the axial movement of the back iron and the permanent magnet in the eddy current ring.

2. The permanent magnet eddy current transmission device according to claim 1, characterized in that: The inner circle of the output flange is a blind hole structure, forming the blind hole cavity for accommodating the output shaft.

3. The permanent magnet eddy current transmission device according to claim 2, characterized in that: The input flange and the output flange are respectively positioned and fixed to the two end surfaces of the yoke through stoppers and screws, and sealing pads are provided on the contact surfaces.

4. The permanent magnet eddy current transmission device according to claim 2, characterized in that: The yoke and the copper ring are in interference fit.

5. The permanent magnet eddy current transmission device according to claim 1, characterized in that: The contact surface between the sealing shaft and the input flange adopts a mechanical sealing structure.

6. The permanent magnet eddy current transmission device according to claim 1, characterized in that: The permanent magnet is a trapezoidal structure that is narrow outside and wide inside. The groove is a trapezoidal groove corresponding to the permanent magnet structure. The permanent magnet is nested and installed in the trapezoidal groove.

7. The permanent magnet eddy current transmission device according to claim 1, characterized in that: The back iron is formed by laminating silicon steel sheets.

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