High-speed heavy-load magnetofluid sealing device

Abstract

The utility model discloses a high-speed heavy-load magnetic fluid sealing device, which belongs to the technical field of magnetic fluid sealing and comprises a shell, a mounting groove is arranged on the inner side of the shell, a shaft lever is sleeved on the inner sides of the shell and the mounting groove, a first magnetic fluid sealing mechanism is arranged between the shell and the shaft lever, and a second magnetic fluid sealing mechanism is arranged between the shell and the shaft lever. A second magnetic fluid sealing mechanism is arranged between the installation groove and the shaft rod, a plurality of screw holes are formed in the end of the shell, an end cover is installed at the end of the shell in a threaded mode, and a butterfly screw is arranged on the end cover in a sleeving mode. According to the utility model, after the shaft rod is mounted in the shell, the end cover is mounted at the end part of the shell in a threaded manner, the shaft rod is fixed by utilizing the end cover, and the butterfly screw is mounted in one screw hole in a threaded manner to fix the end cover, so that the end cover is prevented from loosening, and the stability between the shell and the shaft rod is ensured; and the working quality of the high-speed heavy-load magnetic fluid sealing device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic fluid sealing, and more specifically to a high-speed and heavy-load magnetic fluid sealing device. Background Art

[0002] Magnetic fluid is a new type of functional material. It has both the fluidity of liquid and the magnetism of solid magnetic material. It is a stable colloidal liquid mixed with magnetic solid particles with nanometer diameter, base carrier liquid and surfactant. The fluid has no magnetic attraction when static, and only shows magnetism when an external magnetic field is applied. Magnetic fluid produced with nano-metal and alloy powder has excellent performance and can be widely used in various harsh conditions in magnetic fluid sealing, shock absorption, medical equipment, sound adjustment, optical display, magnetic fluid beneficiation and other fields.

[0003] After searching, the utility model patent with announcement number CN212080162U discloses a high-speed and heavy-load magnetic fluid sealing device, including a shell, a transmission shaft, a magnetic fluid sealing mechanism, an end cover, a first groove, a second groove and a group of balls. A first annular protrusion is provided on the right side of the transmission shaft, and a mounting groove matching the transmission shaft is provided in the shell. The transmission shaft is rotatably installed in the mounting groove. The magnetic fluid sealing mechanism includes a first magnetic fluid sealing mechanism and a second magnetic fluid sealing mechanism. A first bearing is provided on the left side of the transmission shaft. The first bearing is mainly used to provide radial support for the transmission shaft. The first groove, the second groove and the ball are used to provide axial mechanical support for the transmission shaft to the left, and convert the rotational friction force into rolling friction to reduce frictional heat and improve the adaptability in high-speed and heavy-load working environments. The end cover is used to protect the transmission shaft and the right end of the shell. The magnetic fluid sealing device is used for rotating sealing between the shell and the transmission shaft.

[0004] However, the above patents still have the following shortcomings: the stability of the end cover installed on the end of the shell through the thread is poor, and it is easy to loosen, affecting the sealing between the shell and the transmission shaft; and there is a certain friction between the ball, the first groove, and the second groove when rotating, and the ball, the first groove, and the second groove are prone to wear, and the shell and the transmission shaft will also loosen. For this reason, we propose a high-speed heavy-load magnetic fluid sealing device. Utility Model Content

[0005] In view of the problems existing in the prior art, the utility model aims to provide a high-speed and heavy-load magnetic fluid sealing device.

[0006] In order to solve the above problems, the utility model adopts the following technical solutions:

[0007] A high-speed, heavy-load magnetic fluid sealing device comprises a shell, an inner side of the shell is provided with a mounting groove, the inner sides of the shell and the mounting groove are sleeved with a shaft rod, a first magnetic fluid sealing mechanism is provided between the shell and the shaft rod, a second magnetic fluid sealing mechanism is provided between the mounting groove and the shaft rod, a plurality of screw holes are provided at the end of the shell, an end cover is threadedly installed at the end of the shell, a butterfly screw is sleeved on the end cover, the end of the butterfly screw is threadedly installed to the inner cavity of one of the screw holes, a through hole is provided in the middle of the end cover, the end of the shaft rod extends through the through hole to the outside of the end cover, a plurality of oiling mechanisms are provided on the outer side of the shell, a first groove is provided on the inner wall of the mounting groove, a second groove is fixedly connected to the side surface of the middle part of the shaft rod, a plurality of balls are clamped on the second groove, and the ends of the balls extend to the inner cavity of the first groove.

[0008] As a preferred solution of the utility model, the oil adding mechanism includes an oil storage tank arranged on the outside of the shell, a liquid guide groove is arranged at the bottom of the inner cavity of the oil storage tank, the end of the liquid guide groove is connected to the inner cavity of the first groove, a screw plug is threadedly installed on the top of the oil storage tank, a spring is fixedly connected to the bottom surface of the screw plug, a piston push plate is fixedly connected to the bottom end of the spring, and the side of the piston push plate is in contact with the inner wall of the oil storage tank.

[0009] As a preferred solution of the utility model, the first magnetic fluid sealing mechanism includes a first permanent magnet ring fixedly sleeved on the inner wall of the shell and two first sealing grooves opened on the outside of the shell, and the first pole shoe rings are fixedly connected to the two sides of the first permanent magnet ring respectively, and the inner sides of the two first pole shoe rings extend to the inner cavity of the first sealing groove, and the inner cavity of the first sealing groove is provided with magnetic fluid.

[0010] As a preferred solution of the utility model, the second magnetic fluid sealing mechanism includes a second permanent magnet ring fixedly connected to the inner wall of the mounting groove and two second sealing grooves opened on the side of the middle part of the shell, and the second pole shoe rings are fixedly connected on both sides of the second permanent magnet ring, and the end of the second pole shoe ring extends to the inner cavity of the second sealing groove, and the inner cavity of the second sealing groove is provided with magnetic fluid.

[0011] As a preferred solution of the utility model, one end of the shaft rod is fixedly sleeved with a second bearing, the outer side of the second bearing is fixedly sleeved with the inner wall of the mounting groove, and the other end of the shaft rod is fixedly sleeved with a first bearing, and the outer side of the first bearing is fixedly sleeved with the inner wall of the housing.

[0012] As a preferred solution of the utility model, an annular seat is arranged on the outer side of the shell, and a plurality of mounting holes are arranged on the annular seat.

[0013] Compared with the prior art, the advantages of the present invention are:

[0014] (1) In the present invention, after the shaft is installed in the housing, an end cover is threadedly installed on the end of the housing, the shaft is fixed by the end cover, and the end cover is fixed by threading a butterfly screw into a screw hole to prevent the end cover from loosening and ensure the stability between the housing and the shaft.

[0015] (2) In the utility model, when the first groove and the second groove rotate relative to each other, the elastic force of the spring is used to drive the piston push plate to push the lubricating oil in the oil storage tank, so that the lubricating oil enters from the liquid guide groove into between the first groove and the second groove, thereby lubricating the ball between the first groove and the second groove, avoiding wear between the first groove, the second groove and the ball, and improving the working quality of the high-speed and heavy-load magnetic fluid sealing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a structural schematic diagram of the housing of the utility model;

[0018] Figure 3 It is a cross-sectional schematic diagram of the utility model;

[0019] Figure 4 It is a schematic diagram of the interior of the installation slot of the utility model;

[0020] Figure 5 It is a structural schematic diagram of the ball of the utility model;

[0021] Figure 6 It is a structural schematic diagram of the end cover of the utility model;

[0022] Figure 7 It is a structural schematic diagram of the screw plug of the utility model;

[0023] Figure 8 For this utility model Figure 3 A is an enlarged schematic diagram;

[0024] Fig. 9 For this utility model Figure 3 The enlarged schematic diagram of point B in FIG.

[0025] Description of the numbers in the figure:

[0026] 1. Shell; 2. Shaft; 3. Mounting groove; 4. First magnetic fluid sealing mechanism; 5. Second magnetic fluid sealing mechanism; 6. Oil adding mechanism; 7. Screw hole; 8. End cover; 9. Butterfly screw; 10. Perforation; 11. First groove; 12. Second groove; 13. Ball; 14. Oil storage tank; 15. Liquid guide groove; 16. Screw plug; 17. Spring; 18. Piston push plate; 19. Second bearing; 20. First bearing; 21. First permanent magnet ring; 22. First sealing groove; 23. First pole shoe ring; 24. Second permanent magnet ring; 25. Second sealing groove; 26. Second pole shoe ring; 27. Annular seat; 28. Mounting hole. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the utility model in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] Example:

[0031] See also Figure 1-9A high-speed and heavy-load magnetic fluid sealing device comprises a shell 1, a mounting groove 3 is provided on the inner side of the shell 1, a shaft 2 is sleeved on the inner side of the shell 1 and the mounting groove 3, a first magnetic fluid sealing mechanism 4 is provided between the shell 1 and the shaft 2, a second magnetic fluid sealing mechanism 5 is provided between the mounting groove 3 and the shaft 2, a plurality of screw holes 7 are provided at the end of the shell 1, an end cover 8 is threadedly installed at the end of the shell 1, a butterfly screw 9 is sleeved on the end cover 8, the end of the butterfly screw 9 is threadedly installed to the inner cavity of one of the screw holes 7, a through hole 10 is provided in the middle of the end cover 8, the end of the shaft 2 extends to the outside of the end cover 8 through the through hole 10, a plurality of oiling mechanisms 6 are provided on the outer side of the shell 1, a first groove 11 is provided on the inner wall of the mounting groove 3, a second groove 12 is fixedly connected to the side of the middle part of the shaft 2, a plurality of balls 13 are clamped on the second groove 12, and the ends of the balls 13 extend to the inner cavity of the first groove 11.

[0032] For details, please refer to Figure 1 , Figure 3 , Figure 7 and Fig. 9 The oil adding mechanism 6 includes an oil storage tank 14 arranged on the outside of the shell 1, and a liquid guide groove 15 is arranged at the bottom of the inner cavity of the oil storage tank 14. The end of the liquid guide groove 15 is connected to the inner cavity of the first groove 11. A screw plug 16 is threadedly installed on the top of the oil storage tank 14, and a spring 17 is fixedly connected to the bottom surface of the screw plug 16. A piston push plate 18 is fixedly connected to the bottom end of the spring 17, and the side of the piston push plate 18 is in contact with the inner wall of the oil storage tank 14.

[0033] In this embodiment, the end surface of the second groove 12 fits with the end surface of the first groove 11 to prevent the leakage of lubricating oil between the first groove 11 and the second groove 12 . In addition, the inner cavity of the oil storage tank 14 stores lubricating oil.

[0034] For details, please refer to Figure 3 and Figure 8 The first magnetic fluid sealing mechanism 4 includes a first permanent magnet ring 21 fixedly sleeved on the inner wall of the shell 1 and two first sealing grooves 22 opened on the outer side of the shell 1. The first permanent magnet ring 21 is fixedly connected to the first pole shoe rings 23 on both sides. The inner sides of the two first pole shoe rings 23 extend to the inner cavity of the first sealing groove 22. The inner cavity of the first sealing groove 22 is provided with magnetic fluid.

[0035] In this embodiment, the first permanent magnet ring 21 is used to allow the magnetic fluid in the first sealing groove 22 to seal between the first pole shoe ring 23 and the shaft rod 2 , thereby sealing between the housing 1 and the shaft rod 2 .

[0036] For details, please refer to Figure 3 and Fig. 9The second magnetic fluid sealing mechanism 5 includes a second permanent magnet ring 24 fixedly connected to the inner wall of the mounting groove 3 and two second sealing grooves 25 opened on the side of the middle part of the shell 1. The second permanent magnet ring 24 is fixedly connected to the second pole shoe ring 26 on both sides. The end of the second pole shoe ring 26 extends to the inner cavity of the second sealing groove 25. The inner cavity of the second sealing groove 25 is provided with magnetic fluid.

[0037] In this embodiment, the second permanent magnet ring 24 is used to allow the magnetic fluid in the second sealing groove 25 to seal between the shaft 2 and the second pole shoe ring 26 , thereby sealing between the housing 1 and the shaft 2 .

[0038] For details, please refer to Figure 3 One end of the shaft rod 2 is fixedly sleeved with a second bearing 19, and the outer side of the second bearing 19 is fixedly sleeved with the inner wall of the mounting groove 3. The other end of the shaft rod 2 is fixedly sleeved with a first bearing 20, and the outer side of the first bearing 20 is fixedly sleeved with the inner wall of the housing 1.

[0039] In this embodiment, the housing 1 and the shaft 2 are supported by the second bearing 19 and the first bearing 20 to ensure the stability between the housing 1 and the shaft 2.

[0040] For details, please refer to Figure 1 An annular seat 27 is provided on the outer side of the shell 1 , and a plurality of mounting holes 28 are provided on the annular seat 27 .

[0041] In this embodiment, the housing 1 is installed by using the mounting holes 28 and screws.

[0042] Working principle: When in use, first insert the shaft rod 2 into the housing 1 for installation, and thread the end cover 8 on the end of the housing 1, use the end cover 8 to fix the end of the shaft rod 2, and then turn the butterfly screw 9 so that the end of the butterfly screw 9 is threadedly installed into a screw hole 7 to fix the end cover 8 to prevent the end cover 8 from loosening and ensure the stability of the end cover 8 fixing the shaft rod 2. Then open the screw plug 16 to inject lubricating oil into the oil storage tank 14, and after the oil is filled, thread the screw plug 16 on the top of the oil storage tank 14, and at the same time, the piston push plate 18 extending into the inner cavity of the oil storage tank 14 pushes the lubricating oil. At this time, the spring 17 is in a compressed state. Then, when the shaft 2 rotates, the ball 13 on the second groove 12 rotates in the first groove 11. In addition, the elastic force of the spring 17 is used to make the piston push plate 18 squeeze the lubricating oil in the oil storage tank 14 into the space between the first groove 11 and the second groove 12 through the liquid guide groove 15, thereby lubricating the ball 13 rotating between the first groove 11 and the second groove 12 to prevent the ball 13 from being worn and causing displacement between the housing 1 and the shaft 2. Finally, when the shaft 2 rotates, the magnetism of the first permanent magnet ring 21 and the second permanent magnet ring 24 is used respectively to make the magnetic fluid in the first sealing groove 22 and the second sealing groove 25 seal the space between the housing 1 and the shaft 2.

[0043] The above is only a preferred specific implementation method of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes within the technical scope disclosed by the utility model according to the technical solution and improved ideas of the utility model, which should be included in the protection scope of the utility model.

Claims

1. A high-speed and heavy-load magnetic fluid sealing device, comprising a housing (1), characterized in that: The inner side of the housing (1) is provided with a mounting groove (3), the inner side of the housing (1) and the mounting groove (3) is sleeved with a shaft (2), a first magnetic fluid sealing mechanism (4) is provided between the housing (1) and the shaft (2), a second magnetic fluid sealing mechanism (5) is provided between the mounting groove (3) and the shaft (2), a plurality of screw holes (7) are provided at the end of the housing (1), an end cover (8) is threadedly mounted on the end of the housing (1), a butterfly screw (9) is sleeved on the end of the end cover (8), and the end of the butterfly screw (9) is threadedly mounted on the end of the end cover (8). The end cover (8) is installed in the inner cavity of one of the screw holes (7), a through hole (10) is provided in the middle of the end cover (8), the end of the shaft rod (2) passes through the through hole (10) and extends to the outside of the end cover (8), a plurality of oiling mechanisms (6) are provided on the outer side of the shell (1), a first groove (11) is provided on the inner wall of the installation groove (3), a second groove (12) is fixedly connected to the side of the middle of the shaft rod (2), a plurality of balls (13) are clamped on the second groove (12), and the ends of the balls (13) extend to the inner cavity of the first groove (11); The oil adding mechanism (6) comprises an oil storage tank (14) arranged on the outside of the housing (1); a liquid guide groove (15) is arranged at the bottom of the inner cavity of the oil storage tank (14); the end of the liquid guide groove (15) is connected to the inner cavity of the first groove (11); a screw plug (16) is threadedly installed at the top end of the oil storage tank (14); a spring (17) is fixedly connected to the bottom surface of the screw plug (16); a piston push plate (18) is fixedly connected to the bottom end of the spring (17); and the side surface of the piston push plate (18) is in contact with the inner wall of the oil storage tank (14).

2. A high-speed and heavy-load magnetic fluid sealing device according to claim 1, characterized in that: The first magnetic fluid sealing mechanism (4) comprises a first permanent magnetic ring (21) fixedly sleeved on the inner wall of the housing (1) and two first sealing grooves (22) provided on the outer side of the housing (1), the first permanent magnetic ring (21) being fixedly connected to first pole shoe rings (23) on both sides thereof, the inner sides of the two first pole shoe rings (23) extending to the inner cavity of the first sealing groove (22), the inner cavity of the first sealing groove (22) being provided with magnetic fluid.

3. A high-speed and heavy-load magnetic fluid sealing device according to claim 1, characterized in that: The second magnetic fluid sealing mechanism (5) comprises a second permanent magnetic ring (24) fixedly connected to the inner wall of the mounting groove (3) and two second sealing grooves (25) provided on the side of the middle part of the housing (1), the second permanent magnetic ring (24) being fixedly connected to the two sides thereof with second pole shoe rings (26), the ends of the second pole shoe rings (26) extending to the inner cavity of the second sealing grooves (25), and the inner cavity of the second sealing grooves (25) being provided with magnetic fluid.

4. A high-speed and heavy-load magnetic fluid sealing device according to claim 1, characterized in that: One end of the shaft rod (2) is fixedly sleeved with a second bearing (19), the outer side of the second bearing (19) is fixedly sleeved with the inner wall of the mounting groove (3), and the other end of the shaft rod (2) is fixedly sleeved with a first bearing (20), the outer side of the first bearing (20) is fixedly sleeved with the inner wall of the housing (1).

5. A high-speed and heavy-load magnetic fluid sealing device according to claim 1, characterized in that: An annular seat (27) is provided on the outer side of the housing (1), and a plurality of mounting holes (28) are provided on the annular seat (27).

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