Split magnetic liquid sealing device

Abstract

The invention discloses a split type magnetic liquid sealing device in the technical field of mechanical engineering sealing, which comprises a bottom plate, a through hole is formed in the center of the bottom plate, a rotating shaft is arranged in the through hole, the upper part of the rotating shaft is rotatably sleeved with a turntable, a magnetic beam groove with an upward opening is formed in the bottom plate on the periphery of the through hole, and a magnetic conducting ring is fixedly connected in the magnetic beam groove; a plurality of permanent magnets are fixedly connected into the magnetic conductive ring, pole teeth arranged in the radial direction are arranged on the top wall of the magnetic conductive ring and distributed on the two sides of the inner periphery and the outer periphery of the permanent magnets, magnetic liquid used for sealing is attracted to the tooth top faces of the pole teeth, the bottom plate and the rotating disc are subdivided with the diameter as a subdivision line, and subdivision end faces are connected and assembled through bolts. And the bottom plate, the magnetic conductive ring and the turntable are all made of a magnetic conductive material. The device is simple and novel, a bearing is replaced by the balls, the bolts of a split structure are used for splicing, the structure of the device is simplified, on the premise that the anti-swing capacity and the sealing capacity are guaranteed, the installation steps are simplified through split installation, and the production and installation cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical engineering sealing, and in particular is a split magnetic liquid sealing device. Background Art

[0002] Magnetic liquid sealing technology, also known as magnetic fluid sealing, is an advanced technology that uses magnetic liquid (ferrofluid) with high saturation magnetic strength for sealing. Magnetic liquid is a colloid formed by the fusion of nano-scale magnetic conductive materials, dispersants and carriers. It has the fluidity, lubricity and sealing properties of liquid carriers, and the strong magnetism of solid nanoparticles. These characteristics make magnetic liquid have unique application advantages in the field of sealing.

[0003] The existing magnetic liquid sealing device is mainly composed of magnetic fluid and a specially designed sealing device, including a magnetic shaft, magnetic poles, non-magnetic seats, bearings, permanent magnets and other parts. Under the action of the magnetic field, the magnetic liquid will form a "liquid O-ring" in the sealing gap, thereby sealing the medium. This sealing method has the characteristics of no leakage, no wear, no pollution, no directionality, low loss and long life. However, in order to achieve better sealing performance, the existing magnetic liquid sealing device needs to arrange multiple sets of pole teeth, and the bearings need to bear the radial load when the shaft rotates. These complex structures are all arranged axially inside the magnetic liquid sealing device, resulting in the installation of the magnetic liquid sealing device requiring a large amount of axial space and an integrated installation after removing the shaft, which reduces the flexibility and convenience of the installation and application of the magnetic liquid sealing device.

[0004] Therefore, it is necessary to propose a low-cost split-type magnetic liquid sealing device which occupies less axial space, can be installed in a split manner without removing the rotating shaft, has a simple structure, and has sufficient sealing performance. Summary of the invention

[0005] In order to solve the above problems, the purpose of the present invention is to provide a split magnetic liquid sealing device, which reasonably arranges the position of the pole teeth, uses balls between the turntables instead of bearings to bear the radial load, and makes full use of the adsorption effect of the permanent magnet on the turntable, simplifies the device structure, improves the anti-swing ability and sealing ability of the entire device under the rotation of the shaft, and splits the overall structure for split installation, thereby achieving the purpose of reducing the axial space occupancy and facilitating split installation.

[0006] In order to achieve the above-mentioned purpose, the technical scheme of the present invention is as follows: a split magnetic liquid sealing device comprises a bottom plate, a through hole is opened in the center of the bottom plate, a rotating shaft is arranged in the through hole, a turntable is rotatably sleeved on the upper part of the rotating shaft, a magnetic flux groove is opened in the bottom plate at the outer periphery of the through hole, a magnetic conductive ring is fixedly connected in the magnetic flux groove, a plurality of permanent magnets are fixedly connected in the magnetic conductive ring, the magnetic conductive ring is adsorbed on the bottom wall of the turntable, a radially arranged pole teeth are opened on the top wall of the magnetic conductive ring, the pole teeth are distributed on both sides of the inner and outer peripheries of the permanent magnets, magnetic liquid for sealing is adsorbed on the top surfaces of the pole teeth, the bottom plate and the turntable are split with the diameter as the splitting line, the split end faces are detachably connected, and the bottom plate, the magnetic conductive ring and the turntable are all made of magnetic conductive material.

[0007] The principle of the basic solution is: after the components of the device are clamped to the outer periphery of the rotating shaft and installed in a split manner on the mounting surface using bolts, a closed magnetic circuit is formed between the permanent magnet in the magnetic ring and the magnetic base plate, the magnetic ring and the turntable, and a non-uniform magnetic field with alternating strong and weak magnetic fields is generated in the gap between the pole teeth and the turntable, which constrains the magnetic liquid to gather in the gap between the top surface of the pole teeth and the turntable to form a radially arranged magnetic liquid "O"-shaped sealing ring, thereby forming a magnetic liquid seal on the end face of the turntable.

[0008] The beneficial effects of the basic solution are: 1. By installing the device in a split-type connection on the installation surface, there is no need to disassemble the shaft and then sleeve the device. Instead, the various components of the device are directly clamped on the outer circumference of the shaft, which reduces the difficulty of the installation steps, saves the installation cost of the device, and improves the flexibility of the device installation application.

[0009] 2. The magnetic field of the permanent magnet forms a closed magnetic circuit between the bottom plate, the magnetic ring and the turntable, confining the magnetic liquid in a non-uniform magnetic field to achieve a magnetic liquid sealing effect, thereby achieving a pollution-free and leak-free seal. Compared with ordinary mechanical sealing devices, the structure is simpler, the failure points are reduced, the reliability of the equipment is improved, and the frequency and cost of replacing seals are reduced.

[0010] 3. Through the radial arrangement of magnetic liquid "O"-shaped sealing rings, low loss and multi-directional sealing are achieved in the radial direction, reducing radial wear when the shaft rotates and extending the service life of the shaft

[0011] 4. The magnetic ring is used to absorb the turntable to bear the axial load for the shaft, thereby improving the utilization rate of the permanent magnet magnetic field in the device, simplifying the device structure, and saving production and installation costs.

[0012] Furthermore, the inner wall of the rotating disk is provided with a first groove arranged axially, and a first "O" ring for sealing is installed between the first groove and the rotating shaft.

[0013] The beneficial effect of the basic solution is that the first "O" ring made of rubber forms a sealing effect in the axial section in the gap between the turntable and the rotating shaft. Since the turntable rotates with the rotating shaft, the sealing effect of the first "O" ring will not affect the rotation performance of the rotating shaft, nor will it cause unnecessary friction loss.

[0014] Furthermore, a second groove opening toward the mounting surface is formed on the bottom wall of the bottom plate at the periphery of the magnetic flux groove, and a second "O" ring is installed between the second groove and the mounting surface.

[0015] The beneficial effects of the basic solution are: a second "O" shape made of rubber forms a sealing effect on the end face in the gap between the second groove and the mounting surface, changing the axial sealing structure into a radial structure, saving axial space, and improving the adaptability and flexibility of the device installation application when the axial space is insufficient.

[0016] Furthermore, a driving sleeve is fixedly sleeved on the upper part of the rotating shaft, and a conical rectangular wedge tooth is provided on the bottom wall of the driving sleeve to engage and hold the top wall of the rotating disk tightly. The driving sleeve is split with the diameter as the splitting line, and the split end faces are detachably connected.

[0017] The beneficial effects of the basic scheme are: through the conical rectangular wedge teeth engaging the drive sleeve and the turntable, the torque is transmitted for synchronous rotation, the axial and radial swing between the drive sleeve and the turntable is constrained, and the split installation of the drive sleeve reduces the difficulty of installation, thereby improving the stability of the rotation of the shaft, improving the anti-swing ability of the device, simplifying the device structure, and reducing production and installation costs.

[0018] Furthermore, the number of the conical rectangular wedge teeth on the bottom wall of the driving sleeve is at least 2 and they are symmetrically distributed.

[0019] The beneficial effect of the basic scheme is that the number of conical rectangular wedge teeth on the bottom wall of the drive sleeve is at least 2, so the conical rectangular wedge teeth on the bottom wall of the drive sleeve and the top wall of the turntable are meshed in pairs, so as to evenly share the torque of the drive sleeve to drive the turntable to rotate, reduce the risk of metal fatigue, and extend the operating life of the device.

[0020] Furthermore, a first ball rolling groove opening toward the turntable is formed on the bottom plate of the outer periphery of the magnetic flux groove, a second ball rolling groove corresponding to the first ball rolling groove is formed on the bottom wall of the turntable, and a plurality of balls are arranged between the first ball rolling groove and the second ball rolling groove.

[0021] The beneficial effects of the basic solution are: the radial load of the rotating shaft is borne by the bearings instead of the balls between the base plate and the turntable, making the bearings no longer necessary, simplifying the device structure while saving axial space, reducing the production and installation costs of the device, and improving the flexibility and adaptability of the device installation application.

[0022] Furthermore, the volume of the magnetic liquid is at least V1, which is specifically expressed by the formula:

[0023] V1=π(R1+r1)(R1-r1)h1

[0024] Among them, π is the pi, R1 is the outer circle radius of the pole tooth, r1 is the inner circle radius of the pole tooth, and h1 is the distance from the top surface of the pole tooth to the bottom wall of the turntable.

[0025] The beneficial effect of the basic solution is: since the magnetic liquid will leak and lose in the process of forming the magnetic liquid "O"-ring, when adding magnetic liquid, it is necessary to calculate the space between the pole tooth and the sealing surface and fill a sufficient amount of magnetic liquid to ensure the smooth formation of the magnetic liquid "O"-ring and maintain the stability of the sealing effect of the device.

[0026] Furthermore, a pole shoe spacer is provided between the permanent magnet and the rotating disk.

[0027] The beneficial effect of the basic solution is: the permanent magnet is separated from the turntable by the pole shoe spacer, preventing the permanent magnet from adsorbing the turntable and being driven to rotate to generate friction with the inner wall of the magnetic beam slot, thereby improving the overall stability of the device, reducing internal wear of the device, and extending the service life of the device.

[0028] Furthermore, the permanent magnet is radiation magnetized.

[0029] The beneficial effects of the basic scheme are: by radiating magnetization for the permanent magnet, the magnetization method and the magnetic field distribution are flexible and diverse, and it can be magnetized by single-pole radiation, multi-pole direct charging and multi-pole oblique charging. The integral structure of the radiation-magnetized permanent magnet makes it easier to control the dimensional accuracy and simplify the assembly process. The surface field of the permanent magnet is sinusoidal and evenly distributed, the transition zone between the poles is small, and the operation is more stable.

[0030] Furthermore, the number of the pole teeth is at least 3.

[0031] The beneficial effects of the basic scheme are: through the magnetic liquid "O"-shaped sealing ring formed between the pole teeth and the turntable, and distributed on the inner and outer peripheries of the permanent magnet, the sealing effect of the gap between the turntable and the bottom plate is improved, while the permanent magnet is prevented from being corroded by the sealing medium, the friction between the magnetic ring and the bottom wall of the turntable is reduced, and the sealing effect of the device is enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is an axonometric view of a magnetic liquid sealing device in a dissected form according to an embodiment of the present invention.

[0033] Figure 2 It is a front cross-sectional view of a magnetic liquid sealing device in a dissected form according to an embodiment of the present invention.

[0034] Figure 3 A top view of a bottom plate of a split magnetic liquid sealing device according to an embodiment of the present invention.

[0035] The figure marks in the drawings of the specification include: 1. base plate; 2. magnetic ring; 3. permanent magnet; 4. pole shoe spacer; 5. mounting surface; 6. bolt; 7. first ball groove; 8. ball; 9. second ball groove; 10. turntable; 11. first groove; 12. first "O" ring; 13. conical rectangular wedge tooth; 14. drive sleeve; 15. pole tooth; 16. magnetic liquid; 17. second groove; 18. second "O" ring; 19. rotating shaft; 20. dividing line. DETAILED DESCRIPTION

[0036] The following is further described in detail through specific implementation methods:

[0037] Basically as attached Figure 1 , Figure 2 and Figure 3 As shown: a split magnetic liquid sealing device, including a bottom plate 1, a through hole is opened in the center of the bottom plate 1, a rotating shaft 19 is arranged in the through hole, a rotating disk 10 is rotatably sleeved on the upper part of the rotating shaft 19, a magnetic flux groove is opened on the bottom plate 1 at the outer periphery of the through hole, a magnetic flux groove is welded with a magnetic ring 2, a plurality of permanent magnets 3 are welded in the magnetic ring 2, the permanent magnets 3 are radiantly magnetized, the magnetic ring 2 is adsorbed on the bottom wall of the rotating disk 10, a pole shoe spacer 4 is separated between the permanent magnets 3 and the rotating disk 10, a radially arranged pole tooth 15 is opened on the top wall of the magnetic ring 2, and the pole teeth 15 are arranged on the top wall of the magnetic ring 2. 5 are distributed on both sides of the inner and outer peripheries of the permanent magnet 3, the number of pole teeth 15 is at least 3, and magnetic liquid 16 for sealing is adsorbed on the top surfaces of the pole teeth 15; the inner wall of the turntable 10 is provided with axially arranged first grooves 11, and a first "O" ring 12 for sealing is installed between the first groove 11 and the rotating shaft 19; the bottom wall of the bottom plate 1 at the outer periphery of the magnetic flux groove is provided with a second groove 17 with an opening facing the mounting surface 5, and a second "O" ring 18 is installed between the second groove 17 and the mounting surface 5, and the bottom plate 1, the magnetic conductive ring 2 and the turntable 10 are all made of magnetic conductive materials.

[0038] A driving sleeve 14 is clamped on the upper part of the rotating shaft 19, and a conical rectangular wedge tooth 13 is opened on the bottom wall of the driving sleeve 14 to engage and hold the top wall of the turntable 10. The number of the conical rectangular wedge teeth 13 on the bottom wall of the driving sleeve 14 is at least 2 and is symmetrically distributed. The bottom plate 1, the turntable 10 and the driving sleeve 14 are all divided by the diameter as the dividing line 20, and the divided end faces are connected by bolts 6.

[0039] The bottom plate 1 at the periphery of the magnetic flux groove is provided with a first ball groove 7 opening toward the turntable 11 , and the bottom wall of the turntable 10 is provided with a second ball groove 9 corresponding to the first ball groove 7 , and a plurality of balls 8 are installed between the first ball groove 7 and the second ball groove 9 .

[0040] The specific implementation process is as follows: the installer installs it on the mounting surface 5, vertically clamps and docks the split parts of the base plate 1, turntable 10 and drive sleeve 14 on the periphery of the rotating shaft 19 without disassembling the rotating shaft 19, and uses bolts 6 to assemble and fix the base plate 1, turntable 10 and drive sleeve 14 on the mounting surface 5, thereby achieving the purpose of reducing the installation steps and simplifying the installation difficulty.

[0041] The rotating shaft 19 is turned on, and the magnetic field of the permanent magnet 3 in the magnetic ring 2 forms a closed magnetic circuit through the magnetic base plate 1, the magnetic ring 2 and the turntable 10. A non-uniform magnetic field with alternating strengths and weaknesses is generated in the gap between the pole teeth 15 and the turntable 10, and the magnetic liquid 16 is constrained to form a radially arranged magnetic liquid "O"-shaped sealing ring in the gap between the top surface of the pole teeth 15 and the turntable 10 to prevent the medium from leaking from the radial gap between the magnetic ring 2 and the turntable 10; the first "O"-shaped ring 12 installed in the gap between the first groove 11 and the rotating shaft 19 seals to prevent the medium from leaking along the axial gap between the drive sleeve 14 and the rotating shaft 19; the second "O"-shaped ring 18 installed in the gap between the second groove 17 and the mounting surface 5 seals to prevent the medium from leaking along the radial gap between the base plate 1 and the mounting surface 5.

[0042] The driving sleeve 14 rotates together with the rotating shaft 19. The driving sleeve 14 is meshed and tightly held with the rotating disk 10 through the conical rectangular wedge teeth 13, driving the rotating disk 10 to rotate while restraining the axial and radial swings between the driving sleeve 14 and the rotating disk 10, thereby enhancing the rotation stability of the rotating shaft 19. When the rotating shaft 19 rotates, the rotating disk 10 rotates synchronously, and the rotating shaft 19 will not be subjected to the rotation wear of the first "O" ring 12, thereby extending the service life of the device. When the rotating disk 10 rotates, it is adsorbed by the permanent magnet 3 in the magnetic ring 2, which restrains the axial swing of the rotating disk 10 when it rotates with the rotating shaft 19, thereby improving the utilization efficiency of the magnetic field of the permanent magnet 3 in the device, simplifying the restraining structure of the device, and the rotating disk 10 and The permanent magnets 3 are separated by pole shoe spacers 4 to prevent the permanent magnets 3 in the magnetic ring 2 from adsorbing the turntable 10 so that the magnetic ring 2 rotates with the turntable 10, causing friction between the magnetic ring 2 and the inner wall of the magnetic flux groove, thereby reducing wear and aging inside the device. The balls 8 between the first ball groove 7 of the base plate 1 and the second ball groove 9 of the turntable 10 bear the axial structural pressure inside the device while restraining the radial swing of the turntable 10 caused by the rotation of the shaft 19, thereby enhancing the overall anti-swing ability and sealing ability of the device. At the same time, the balls 8 replace the bearings to simplify the structure of the device, reduce the axial space required for the device, and improve the adaptability and flexibility of the device in installation and application when the axial space is insufficient.

[0043] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0044] The above is only an embodiment of the present invention. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A split magnetic liquid sealing device, characterized in that: The invention comprises a bottom plate (1), a through hole is formed in the center of the bottom plate (1), a rotating shaft (17) is provided in the through hole, a rotating disk (10) is rotatably sleeved on the upper part of the rotating shaft (17), a magnetic flux groove is formed on the bottom plate (1) at the outer periphery of the through hole, a magnetic conductive ring (2) is fixedly connected in the magnetic flux groove, a plurality of permanent magnets (3) are fixedly connected in the magnetic conductive ring (2), the magnetic conductive ring (2) is adsorbed on the bottom wall of the rotating disk (10), a radially arranged polar teeth (15) are formed on the top wall of the magnetic conductive ring (2), the polar teeth (15) are distributed on both sides of the inner and outer peripheries of the permanent magnets (3), magnetic liquid (16) for sealing is adsorbed on the top surfaces of the polar teeth (15), the bottom plate (1) and the rotating disk (10) are both split with the diameter as the splitting line (20), the split end surfaces are detachably connected, and the bottom plate (1), the magnetic conductive ring (2) and the rotating disk (10) are all made of magnetic conductive material.

2. The split magnetic liquid sealing device according to claim 1, characterized in that: The inner wall of the rotating disk (10) is provided with a first groove (11) arranged axially, and a first "O" ring (12) for sealing is installed between the first groove (11) and the rotating shaft (17).

3. The split magnetic liquid sealing device according to claim 1, characterized in that: A second groove (17) with an opening facing the mounting surface (5) is formed on the bottom wall of the bottom plate (1) at the periphery of the magnetic flux groove, and a second "O"-shaped ring (18) is installed between the second groove (17) and the mounting surface (5).

4. The split magnetic liquid sealing device according to claim 1, characterized in that: A driving sleeve (14) is fixedly sleeved on the upper part of the rotating shaft (17). The bottom wall of the driving sleeve (14) is provided with conical rectangular wedge teeth (13) which mesh and tightly hold the top wall of the rotating disk (10). The driving sleeve (14) is split with the diameter as a splitting line (20), and the split end faces are detachably connected.

5. The split magnetic liquid sealing device according to claim 3, characterized in that: The number of the conical rectangular wedge teeth (13) on the bottom wall of the driving sleeve (14) is at least 2 and they are symmetrically distributed.

6. The split magnetic liquid sealing device according to claim 1, characterized in that: A first ball rolling groove (7) opening toward the turntable (10) is formed on the bottom plate (1) at the periphery of the magnetic beam groove, and a second ball rolling groove (9) corresponding to the first ball rolling groove (7) is formed on the bottom wall of the turntable (10), and a plurality of balls (8) are arranged between the first ball rolling groove (7) and the second ball rolling groove (9).

7. The split magnetic liquid sealing device according to claim 2, characterized in that: The volume of the magnetic liquid (16) is at least V1, which is specifically expressed by the formula: V1=π(R1+r1)(R1-r1)h1 Wherein, π is the circumference of a circle, R1 is the outer radius of the pole tooth (15), r1 is the inner radius of the pole tooth (15), and h1 is the distance between the top surface of the pole tooth (15) and the bottom wall of the rotating disk (10).

8. The split magnetic liquid sealing device according to claim 1, characterized in that: A pole shoe spacer (4) is provided between the permanent magnet (3) and the rotating disk (10).

9. The split magnetic liquid sealing device according to claim 1, characterized in that: The permanent magnet (3) is magnetized by radiation.

10. The split magnetic liquid sealing device according to claim 1, characterized in that: The number of the pole teeth (15) is at least three.

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