Split type magnetofluid sealing device

Abstract

The utility model discloses a split type magnetic fluid sealing device, which belongs to the technical field of magnetic fluid sealing, and comprises a shell, a shell cover is arranged at the end part of the shell, a shaft rod is sleeved in the shell and the shell cover, a magnetic sealing mechanism is arranged between the shell and the shaft rod, a through groove is arranged in the shell, and the magnetic sealing mechanism is arranged in the through groove. A push groove is formed in the shell cover and communicates with an inner cavity of the through groove, and a plurality of outer through holes are formed in the bottom of the inner cavity of the through groove. According to the utility model, the magnetic fluid in the push groove is continuously pushed by utilizing the elastic force of the spring, so that the magnetic fluid in the push groove enters the through groove, the through groove is always filled with the magnetic fluid, and the magnetic fluid in the through groove enters the sealing groove from the outer through hole and the inner through hole; and the magnetic fluid in the sealing groove is used for performing magnetic fluid sealing on the pole shoe ring and the rotary sealing cylinder by utilizing the magnetism of the magnet ring, so that the working quality of the split type 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 split magnetic fluid sealing device. Background Art

[0002] Magnetic fluid, also known as magnetic liquid or 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 a diameter of nanometers, a base carrier liquid and a surfactant. The fluid has no magnetic attraction when static, and only exhibits magnetism when an external magnetic field is applied. Magnetic fluids produced with nano-metal and alloy powders have 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 CN216812854U discloses a small split type magnetic fluid sealing device, including a main body, a mounting plate welded on one side outer wall of the main body, and an axial rod groove is opened inside the main body, and an axial rod extending to the outside of the main body is inserted inside the axial rod groove, and pole shoes are arranged on the inner side wall of the axial rod groove, and the pole shoes are distributed in an equidistant horizontal structure, and magnets are placed on the inner side wall of the axial rod groove between the pole shoes, a magnetic flow groove is opened inside the mounting plate, and a through groove is opened on one side inner wall of the magnetic flow groove; the patent opens a magnetic flow groove, and the magnetic flow groove can use the effects of the through groove and the injection groove to supplement the magnetic fluid, and the combination of the magnet and the pole shoe can isolate the air, making the device more practical, and the first sealing bearing and the second sealing bearing are arranged, and the first sealing bearing and the second sealing bearing can improve the sealing of the device.

[0004] However, the above patent has the following disadvantages: although the magnetic fluid can be added to the injection groove through the magnetic flow groove and the through groove, it is not convenient to ensure that the through groove located above the injection groove has magnetic fluid, which affects the stability of the seal. Therefore, we propose a split magnetic fluid sealing device. Utility Model Content

[0005] In view of the problems existing in the prior art, the purpose of the utility model is to provide a split magnetic fluid sealing device.

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

[0007] A split magnetic fluid sealing device comprises a shell, a shell cover is provided at the end of the shell, a shaft rod is sleeved in the shell and the shell cover, a magnetic sealing mechanism is provided between the shell and the shaft rod, a through groove is provided inside the shell, a push groove is provided inside the shell cover, the inner cavities of the push groove and the through groove are connected, a plurality of external through holes are provided at the bottom of the inner cavity of the through groove, a plurality of springs are fixedly connected to the inner wall of the push groove, the ends of the plurality of springs are fixedly connected to insulating push ring plates, the side surfaces of the insulating push ring plates are fitted with the inner walls of the push grooves, the end faces of the insulating push ring plates are fixedly connected to a plurality of pull rods, the ends of the plurality of pull rods are movably sleeved to the outside of the shell cover and fixedly connected to pull rings.

[0008] As a preferred solution of the utility model, the magnetic sealing mechanism includes a rotating sealing cylinder fixedly sleeved on the outside of the shaft and a plurality of pole shoe rings fixedly sleeved on the inner wall of the outer shell, the inner side surface of the pole shoe ring and the outer side surface of the rotating sealing cylinder are in contact with each other, the outer side of the pole shoe ring is provided with a plurality of inner through holes, the positions of the inner through holes and the outer through holes correspond to each other, the inner side surface of the pole shoe ring is provided with a sealing groove, and a magnet ring is fixedly connected between every two of the pole shoe rings.

[0009] As a preferred solution of the utility model, a No. 2 bearing is fixedly sleeved on the outer side of the shaft rod, and a No. 1 bearing is fixedly sleeved on the outer side of the shaft rod. The outer side surfaces of the No. 1 bearing and the No. 2 bearing are respectively connected to the inner wall of the outer shell, and the No. 1 bearing and the No. 2 bearing are located on both sides of the magnetic sealing mechanism.

[0010] As a preferred solution of the utility model, a first sealed bearing is fixedly sleeved on the inner wall of the shell, a first sealing ring is fixedly sleeved on the inner side of the first sealed bearing, and the inner side of the first sealing ring fits the outer side of the shaft.

[0011] As a preferred solution of the utility model, a second sealed bearing is fixedly sleeved on the inner wall of the shell cover, a second sealing ring is fixedly sleeved on the inner side surface of the second sealed bearing, and the inner side surface of the second sealing ring fits the outer side surface of the shaft.

[0012] As a preferred solution of the utility model, fixing holes are respectively provided at both ends of the shaft rod.

[0013] As a preferred solution of the utility model, a magnet injection hole is provided on the top surface of the shell cover, the bottom end of the magnet injection hole is connected to the inner cavity of the push groove, and a threaded cover is threadedly installed on the top of the magnet injection hole.

[0014] Compared with the prior art, the advantages of the present invention are:

[0015] In the utility model, the elastic force of the spring is used to continuously push the magnetic fluid in the push groove, so that the magnetic fluid in the push groove enters the through groove and the through groove is always filled with the magnetic fluid. In addition, the magnetic fluid in the through groove enters the sealing groove from the outer through hole and the inner through hole, and the magnetism of the magnet ring is used to make the magnetic fluid in the sealing groove perform magnetic fluid sealing between the pole shoe ring and the rotating sealing cylinder, thereby improving the working quality of the split 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 structural schematic diagram of the pole shoe ring of the utility model.

[0020] Explanation of the numbers in the figure: 1. Shell; 2. Shell cover; 3. Shaft; 4. Magnetic sealing mechanism; 5. Through groove; 6. Push groove; 7. External through hole; 8. Spring; 9. Insulating push ring plate; 10. Pull rod; 11. Pull ring; 12. Magnetic injection hole; 13. Threaded cover; 14. Rotating sealing cylinder; 15. Pole shoe ring; 16. Internal through hole; 17. Sealing groove; 18. Magnet ring; 19. No. 1 bearing; 20. No. 2 bearing; 21. First sealed bearing; 22. First sealing ring; 23. Second sealed bearing; 24. Second sealing ring; 25. Fixing hole. DETAILED DESCRIPTION

[0021] 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.

[0022] 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.

[0023] 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.

[0024] Example:

[0025] See also Figure 1-4 A split magnetic fluid sealing device comprises a shell 1, a shell cover 2 is provided at the end of the shell 1, a shaft 3 is sleeved in the shell 1 and the shell cover 2, a magnetic sealing mechanism 4 is provided between the shell 1 and the shaft 3, a through groove 5 is provided inside the shell 1, a push groove 6 is provided inside the shell cover 2, the push groove 6 and the inner cavity of the through groove 5 are connected, a plurality of external through holes 7 are provided at the bottom of the inner cavity of the through groove 5, a plurality of springs 8 are fixedly connected to the inner wall of the push groove 6, an insulating push ring plate 9 is fixedly connected to the ends of the plurality of springs 8, the side surface of the insulating push ring plate 9 is fitted with the inner wall of the push groove 6, a plurality of pull rods 10 are fixedly connected to the end surface of the insulating push ring plate 9, and the ends of the plurality of pull rods 10 are movably sleeved to the outside of the shell cover 2 and fixedly connected to pull rings 11.

[0026] In this embodiment, the elastic force of the spring 8 is used to drive the insulating push ring plate 9 to push the magnetic fluid in the push groove 6, thereby ensuring that there is sufficient magnetic fluid in the through groove 5.

[0027] For details, please refer to Figure 3 and Figure 4 The magnetic sealing mechanism 4 includes a rotating sealing cylinder 14 fixedly sleeved on the outside of the shaft 3 and a plurality of pole shoe rings 15 fixedly sleeved on the inner wall of the outer shell 1. The inner side surface of the pole shoe ring 15 fits with the outer side surface of the rotating sealing cylinder 14. The outer side of the pole shoe ring 15 is provided with a plurality of inner through holes 16. The positions of the inner through holes 16 and the outer through holes 7 correspond to each other. The inner side surface of the pole shoe ring 15 is provided with a sealing groove 17. A magnet ring 18 is fixedly connected between every two pole shoe rings 15.

[0028] In this embodiment, the magnetic fluid in the through groove 5 is introduced into the sealing groove 17 through the outer through hole 7 and the inner through hole 16, and the magnetic fluid in the sealing groove 17 is used to seal the pole piece ring 15 and the rotating sealing cylinder 14.

[0029] For details, please refer to Figure 3A No. 2 bearing 20 is fixedly sleeved on the outer side of the shaft rod 3, and a No. 1 bearing 19 is fixedly sleeved on the outer side of the shaft rod 3. The outer side surfaces of the No. 1 bearing 19 and the No. 2 bearing 20 are respectively connected to the inner wall of the outer shell 1, and the No. 1 bearing 19 and the No. 2 bearing 20 are located on both sides of the magnetic sealing mechanism 4.

[0030] In this embodiment, the smooth rotation of the shaft rod 3 is ensured by the No. 1 bearing 19 and the No. 2 bearing 20 .

[0031] For details, please refer to Figure 3 A first sealing bearing 21 is fixedly sleeved on the inner wall of the housing 1 , a first sealing ring 22 is fixedly sleeved on the inner side of the first sealing bearing 21 , and the inner side of the first sealing ring 22 fits the outer side of the shaft 3 .

[0032] In this embodiment, the shaft 3 and the housing 1 are supported by the first sealed bearing 21 and the first sealing ring 22 .

[0033] For details, please refer to Figure 3 A second sealing bearing 23 is fixedly sleeved on the inner wall of the shell cover 2 , a second sealing ring 24 is fixedly sleeved on the inner side surface of the second sealing bearing 23 , and the inner side surface of the second sealing ring 24 fits the outer side surface of the shaft rod 3 .

[0034] In this embodiment, the shaft 3 and the housing cover 2 are supported by the second sealed bearing 23 and the second sealing ring 24 .

[0035] For details, please refer to Figure 1 , fixing holes 25 are respectively provided at both ends of the shaft rod 3.

[0036] In this embodiment, the end of the shaft rod 3 is connected to the external device through the cooperation of the fixing hole 25 and the screw.

[0037] For details, please refer to Figures 1 to 3 A magnetic injection hole 12 is provided on the top surface of the shell cover 2, the bottom end of the magnetic injection hole 12 is connected to the inner cavity of the push groove 6, and a threaded cover 13 is threadedly installed on the top of the magnetic injection hole 12.

[0038] In this embodiment, magnetic fluid is injected into the push groove 6 and the through groove 5 from the magnetic injection hole 12 , and the magnetic injection hole 12 is blocked by the threaded cover 13 .

[0039] Working principle: When in use, first add magnetic fluid into the push groove 6 from the magnetic injection hole 12, and after injection, threadedly install the threaded cover 13 in the magnetic injection hole 12, pull the pull ring 11 when injecting the magnetic fluid so that the insulating push ring plate 9 is close to the inner wall of the push groove 6, so that the spring 8 is compressed, and then release the pull ring 11, and use the restoring elastic force of the spring 8 to drive the insulating push ring plate 9 to move, and use the insulating push ring plate 9 to push the magnetic fluid in the push groove 6 into the through groove 5, and make the magnetic fluid in the through groove 5 enter the sealing groove 17 from the outer through hole 7 and the inner through hole 16. At this time, the spring 8 also has a pushing elastic force to ensure that the insulating push ring plate 9 continues to push the magnetic fluid in the push groove 6, and finally use the magnetism of the magnet ring 18 to make the magnetic fluid in the sealing groove 17 seal the rotating sealing cylinder 14 and the pole shoe ring 15 to ensure the sealing of the shaft rod 3 when it rotates.

[0040] 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 split type magnetic fluid sealing device, comprising a housing (1), characterized in that: A shell cover (2) is provided at the end of the shell (1), a shaft (3) is sleeved in the shell (1) and the shell cover (2), a magnetic sealing mechanism (4) is provided between the shell (1) and the shaft (3), a through groove (5) is provided inside the shell (1), a push groove (6) is provided inside the shell cover (2), the inner cavities of the push groove (6) and the through groove (5) are connected, a plurality of external through holes (7) are provided at the bottom of the inner cavity of the through groove (5), a plurality of springs (8) are fixedly connected to the inner wall of the push groove (6), the ends of the plurality of springs (8) are fixedly connected to an insulating push ring plate (9), the side surface of the insulating push ring plate (9) is in contact with the inner wall of the push groove (6), the end surface of the insulating push ring plate (9) is fixedly connected to a plurality of pull rods (10), the ends of the plurality of pull rods (10) are all movably sleeved to the outside of the shell cover (2) and fixedly connected to a pull ring (11).

2. A split type magnetic fluid sealing device according to claim 1, characterized in that: The magnetic sealing mechanism (4) comprises a rotating sealing cylinder (14) fixedly sleeved on the outside of the shaft (3) and a plurality of pole shoe rings (15) fixedly sleeved on the inner wall of the housing (1), the inner side surface of the pole shoe ring (15) and the outer side surface of the rotating sealing cylinder (14) being in contact with each other, a plurality of inner through holes (16) are provided on the outer side of the pole shoe ring (15), the positions of the inner through holes (16) and the outer through holes (7) correspond to each other, a sealing groove (17) is provided on the inner side surface of the pole shoe ring (15), and a magnet ring (18) is fixedly connected between every two pole shoe rings (15).

3. A split type magnetic fluid sealing device according to claim 1, characterized in that: A No. 2 bearing (20) is fixedly sleeved on the outer side of the shaft rod (3), and a No. 1 bearing (19) is fixedly sleeved on the outer side of the shaft rod (3). The outer side surfaces of the No. 1 bearing (19) and the No. 2 bearing (20) are respectively connected to the inner wall of the housing (1), and the No. 1 bearing (19) and the No. 2 bearing (20) are located on both sides of the magnetic sealing mechanism (4).

4. A split type magnetic fluid sealing device according to claim 1, characterized in that: A first sealing bearing (21) is fixedly sleeved on the inner wall of the outer shell (1), a first sealing ring (22) is fixedly sleeved on the inner side surface of the first sealing bearing (21), and the inner side surface of the first sealing ring (22) fits the outer side surface of the shaft (3).

5. The split magnetic fluid sealing device according to claim 1, characterized in that: A second sealing bearing (23) is fixedly sleeved on the inner wall of the shell cover (2), a second sealing ring (24) is fixedly sleeved on the inner side surface of the second sealing bearing (23), and the inner side surface of the second sealing ring (24) fits the outer side surface of the shaft rod (3).

6. A split type magnetic fluid sealing device according to claim 1, characterized in that: Both ends of the shaft rod (3) are respectively provided with fixing holes (25).

7. A split type magnetic fluid sealing device according to claim 1, characterized in that: The top surface of the shell cover (2) is provided with a magnet injection hole (12), the bottom end of the magnet injection hole (12) is connected to the inner cavity of the push groove (6), and the top of the magnet injection hole (12) is threadedly mounted with a threaded cover (13).

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