Modular combined multi-stage magnetic liquid rotary seal experimental device

Abstract

The application relates to a modular combined multi-stage magnetic liquid rotary sealing experiment device, and belongs to the magnetic liquid sealing field. The application comprises a motor, a shaft coupling, a rotating shaft, an end cover, a magnetic isolation ring, a shell, an annular permanent magnet, a bearing, magnetic liquid, a pole shoe and a rubber sealing ring. The pole shoe is provided with pole teeth, a boss, a groove, an annular sealing groove and a pressure measuring hole. The rubber sealing ring is embedded in the annular sealing groove of the pole shoe, and the pole shoes are mutually provided with concave-convex matching. The sealing stages can be disassembled and arranged according to the required number of pole teeth. The shell is arranged on the outer circumference of the pole shoe and is fixed through screw connection. The application has simple and reasonable structure design, can realize rapid disassembly and assembly, provides convenience for the experimental research on the pressure resistance mechanism of the multi-stage magnetic liquid rotary sealing, and meets the use requirement.

Description

Technical Field

[0001] This invention relates to an experimental apparatus, and more particularly to a modular, multi-stage magnetic liquid rotary sealing experimental apparatus, which belongs to the field of magnetic liquids. Background Technology

[0002] Compared to traditional dynamic seals, magnetic fluid seals offer advantages such as zero leakage, no solid friction and wear, and long service life. However, due to limitations in permanent magnet materials, the pressure resistance of a single-stage magnetic fluid seal is typically around 0.02 MPa. For applications requiring higher sealing pressures, multi-stage magnetic fluid seals are necessary.

[0003] However, there is currently a lack of unified understanding regarding the pressure resistance and failure mechanisms of multi-stage magnetic fluid seals. This leads to reliance on experience in the design of multi-stage magnetic fluid seals, resulting in increased seal volume and material waste. Therefore, it is necessary to conduct further in-depth research on the multi-stage sealing mechanism.

[0004] Chinese patent CN102252837B, published on January 23, 2013, discloses an invention patent entitled "An Experimental Study Device for the Pressure Resistance Mechanism of Magnetic Liquid Sealing." This device is for static sealing experiments and lacks a rotating shaft, thus failing to simulate real rotating sealing conditions.

[0005] Chinese patent CN103759932B, published on September 30, 2015, discloses an invention patent entitled "An Experimental Study Device for the Sealing Pressure Resistance Mechanism of Magnetic Liquid". This device adopts an integral design with a fixed number of sealing levels, thus making it impossible to study the sealing pressure resistance mechanism under different levels.

[0006] Therefore, it is particularly necessary to provide an experimental device with a reasonable structure that can be quickly disassembled and assembled, and which can be used to study the pressure resistance mechanism of rotary seals of magnetic fluids of different grades. Summary of the Invention

[0007] The purpose of this invention is to overcome the above-mentioned shortcomings in the prior art and to provide a modular, multi-stage magnetic liquid rotary sealing experimental device with a simple and reasonable structural design that can be quickly disassembled and adjusted.

[0008] The technical solution adopted by this invention to solve the above problems is as follows: This modular combined multi-stage magnetic liquid rotary sealing experimental device includes a motor, a coupling, a rotating shaft, a left end cover, a left screw, a middle section of the outer shell, a right screw, a right end cover, a right bearing, a left bearing, a magnetic liquid, a left outer shell, and a right outer shell. The rotating shaft is connected to the motor through a coupling. The device is characterized by further including a right end pole shoe, a right pole shoe, a right first pole shoe, a left first pole shoe, a left pole shoe, a left end pole shoe, a pressure measuring hole, an annular permanent magnet, a left magnetic isolation ring, a right magnetic isolation ring, a right rubber sealing ring, and a left rubber sealing ring. The left first pole shoe, left pole shoe, left end pole shoe, right first pole shoe, right pole shoe, and right end pole shoe are all identical in shape and have pole teeth on their inner circumference. One end face has a circular boss, and the other end face has a circular groove. An annular sealing groove is also formed on the outer circumference of the side with the circular groove. A threaded hole and a pressure measuring hole are formed on the outer circumference. The right end groove of the left first pole shoe is close to the left end of the annular permanent magnet. A concave-convex fit is formed on the end face protrusion. The left pole shoe, left end pole shoe, and left magnetic isolation ring are sequentially pressed against the left end face protrusion of the left first pole shoe, forming a concave-convex fit. The left end groove of the right first pole shoe is pressed against the right end face protrusion of the annular permanent magnet, forming a concave-convex fit. The right pole shoe, right end pole shoe, and right magnetic isolation ring are sequentially pressed against the right end face protrusion of the right first pole shoe, forming a concave-convex fit. The left rubber sealing ring is embedded in the annular seal on the outer circumference of the left first pole shoe, left pole shoe, and left end pole shoe. In the groove, the right rubber sealing ring is embedded in the annular sealing groove on the outer circumference of the right first pole shoe, the right pole shoe, and the right end pole shoe; the rotating shaft, left end cover, left magnetic shielding ring, left screw, middle section of the outer shell, annular permanent magnet, right screw, right magnetic shielding ring, right end cover, right bearing, right end pole shoe, right pole shoe, right first pole shoe, left first pole shoe, left pole shoe, left end pole shoe, left bearing, magnetic fluid, right rubber sealing ring, left rubber sealing ring, left outer shell, and right outer shell constitute the sealing assembly.

[0009] Preferably, the left pole shoe of the present invention is used in conjunction with the left outer shell, and the right pole shoe is used in conjunction with the right outer shell.

[0010] Preferably, the annular permanent magnet, the left first pole shoe, the left pole shoe, the left end pole shoe, the rotating shaft, the right end pole shoe, the right pole shoe, and the right first pole shoe of the present invention form a magnetic circuit.

[0011] Preferably, the magnetic liquid of the present invention is injected into the gap between the pole teeth and the rotating shaft of each of the left first pole shoe, left pole shoe, left end pole shoe, right first pole shoe, right pole shoe, and right end pole shoe.

[0012] Preferably, the left bearing of the present invention is installed in the inner hole groove of the left end cover, close to the left end face of the left magnetic shielding ring, and the right bearing is installed in the inner hole groove of the right end cover, close to the right end face of the right magnetic shielding ring.

[0013] Preferably, the right end face of the left magnetic isolation ring of the present invention is provided with a circular groove for engaging with the left end face of the left end pole shoe, and the left end face of the right magnetic isolation ring is provided with a circular groove for engaging with the right end face of the right end pole shoe.

[0014] Preferably, the left end cap, left magnetic isolation ring, left screw, middle section of the outer shell, right screw, right magnetic isolation ring, right end cap, right bearing, left bearing, left outer shell, and right outer shell of the present invention are all made of non-magnetic materials.

[0015] Preferably, the rotating shaft, right end pole shoe, right pole shoe, right first pole shoe, left first pole shoe, left pole shoe, and left end pole shoe of the present invention are all made of magnetically conductive material.

[0016] Compared with the prior art, the present invention has the following advantages and effects: the overall structure design is simple and reasonable, it can be quickly disassembled and assembled, the sealing level can be freely adjusted, it provides convenience for experimental research on the pressure resistance mechanism of multi-stage magnetic liquid rotary seal, and meets the usage requirements. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of an embodiment of the present invention.

[0018] Figure 2 This is a structural diagram of the sealing assembly according to an embodiment of the present invention.

[0019] Figure 3 yes Figure 1 AA section diagram.

[0020] In the diagram: 1. Motor; 2. Coupling; 3. Shaft; 4. Left end cover; 5. Left magnetic isolation ring; 6. Left screw; 7. Middle section of outer shell; 8. Ring permanent magnet; 9. Right screw; 10. Right magnetic isolation ring; 11. Right end cover; 12. Right bearing; 13. Right end pole shoe; 14. Right first pole shoe; 15. Left first pole shoe; 16. Left pole shoe; 17. Left end pole shoe; 18. Left bearing; 19. Magnetic fluid; 20. Right rubber sealing ring; 21. Left rubber sealing ring; 22. Left outer shell; 23. Right outer shell; 24. Pressure measuring hole; 25. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0022] Example

[0023] See Figures 1 to 3The modular, multi-stage magnetic liquid rotary sealing experimental device of this embodiment includes a motor 1, a coupling 2, a rotating shaft 3, a left end cover 4, a left magnetic isolation ring 5, a left screw 6, a middle section of the outer shell 7, a ring-shaped permanent magnet 8, a right screw 9, a right magnetic isolation ring 10, a right end cover 11, a right bearing 12, a right end pole shoe 13, a right pole shoe 14, a right first pole shoe 15, a left first pole shoe 16, a left pole shoe 17, a left end pole shoe 18, a left bearing 19, a magnetic liquid 20, a right rubber sealing ring 21, a left rubber sealing ring 22, a left outer shell 23, a right outer shell 24, and a pressure measuring hole 25; the connections between the various parts constituting this device are as follows.

[0024] In this embodiment, the rotating shaft 3 is connected to the motor 1 via a coupling 2; the annular permanent magnet 8 is axially magnetized, and both ends are provided with bosses.

[0025] In this embodiment, the left first pole shoe 16, left pole shoe 17, left end pole shoe 18, right first pole shoe 15, right pole shoe 14, and right end pole shoe 13 all have the same shape. They have pole teeth on their inner circumference, a circular boss on one end face, a circular groove on the other end face, an annular sealing groove on the outer circumference of the side with the circular groove, and threaded holes and pressure measuring holes 25 on the outer circumference.

[0026] In this embodiment, the left rubber sealing ring 22 is embedded in the annular sealing groove on the outer circumference of the left first pole shoe 16, the left pole shoe 17, and the left end pole shoe 18, and the right rubber sealing ring 21 is embedded in the annular sealing groove on the outer circumference of the right first pole shoe 15, the right pole shoe 14, and the right end pole shoe 13.

[0027] In this embodiment, the right end groove of the left first pole shoe 16 is close to the left end face protrusion of the annular permanent magnet 8 to form a concave-convex fit. The left pole shoe 17, the left end pole shoe 18, and the left magnetic isolation ring 5 are successively close to the left end face protrusion of the left first pole shoe 16 to form a concave-convex fit with each other.

[0028] In this embodiment, the left end groove of the right first pole shoe 15 is close to the right end face protrusion of the annular permanent magnet 8 to form a concave-convex fit. The right pole shoe 14, the right end pole shoe 13, and the right magnetic isolation ring 10 are successively close to the right end face protrusion of the right first pole shoe 15 to form a concave-convex fit with each other.

[0029] In this embodiment, the right end face of the left magnetic isolation ring 5 is provided with a circular groove for engaging with the left end face of the left end pole shoe 18, and the left end face of the right magnetic isolation ring 10 is provided with a circular groove for engaging with the right end face of the right end pole shoe 13.

[0030] In this embodiment, the annular permanent magnet 8, the left first pole piece 16, the left pole piece 17, the left end pole piece 18, the rotating shaft 3, the right end pole piece 13, the right pole piece 14, and the right first pole piece 15 form a magnetic circuit.

[0031] In this embodiment, the magnetic fluid 20 is injected into the gap between the pole teeth and the rotating shaft 3 of each of the left first pole shoe 16, left pole shoe 17, left end pole shoe 18, right first pole shoe 15, right pole shoe 14, and right end pole shoe 13.

[0032] In this embodiment, the right end of the left end cover 4 has a stepped hole, which is close to the left end face of the left magnetic shielding ring 5. It is fixedly connected to the left end pole shoe 18 by the left screw 6. The left end of the right end cover 11 has a stepped hole, which is close to the right end face of the right magnetic shielding ring 10. It is fixedly connected to the right end pole shoe 13 by the right screw 9.

[0033] In this embodiment, the left bearing 19 is installed in the inner hole groove of the left end cover 4, close to the left end face of the left magnetic shielding ring 5, and the right bearing 12 is installed in the inner hole groove of the right end cover 11, close to the right end face of the right magnetic shielding ring 10.

[0034] In this embodiment, the rotating shaft 3 passes through the inner holes of the left bearing 19 and the right bearing 12.

[0035] In this embodiment, the left outer shell 23 is close to the right end face of the left end cover 4 and is installed on the outer circumference of the left pole shoe 17. It is connected and fixed to the left pole shoe 17 by the left screw 6. The right outer shell 24 is close to the right end face of the right end cover 11 and is connected and fixed to the right pole shoe 14 by the right screw 9.

[0036] In this embodiment, the middle section 7 of the outer shell is installed on the outer circumference of the annular permanent magnet 8, and is fixed to the left first pole shoe 16 and the right first pole shoe 15 by the left screw 6 and the right screw 9.

[0037] In this embodiment, the rotating shaft 3, left end cover 4, left magnetic isolation ring 5, left screw 6, middle section of outer shell 7, annular permanent magnet 8, right screw 9, right magnetic isolation ring 10, right end cover 11, right bearing 12, right end pole shoe 13, right pole shoe 14, right first pole shoe 15, left first pole shoe 16, left pole shoe 17, left end pole shoe 18, left bearing 19, magnetic fluid 20, right rubber sealing ring 21, left rubber sealing ring 22, left outer shell 23, and right outer shell 24 constitute a sealing assembly.

[0038] In this embodiment, the left pole shoe 17 in the sealing assembly is used in conjunction with the left outer shell 23, and the right pole shoe 14 is used in conjunction with the right outer shell 24. The number can be set by disassembling and assembling according to the number of pole teeth required for the experiment. Alternatively, the left pole shoe 17, left outer shell 23, right pole shoe 14, and right outer shell 24 can all be removed, leaving only the rotating shaft 3, left end cover 4, left magnetic isolation ring 5, left screw 6, middle section of outer shell 7, annular permanent magnet 8, right screw 9, right magnetic isolation ring 10, right end cover 11, right bearing 12, right end pole shoe 13, right first pole shoe 15, left first pole shoe 16, left end pole shoe 18, left bearing 19, magnetic fluid 20, right rubber sealing ring 21, and left rubber sealing ring 22.

[0039] In this embodiment, the pressure measuring port 25 is connected to an external pressure gauge.

[0040] In this embodiment, the left end cap 4, left magnetic isolation ring 5, left screw 6, middle section of outer shell 7, right screw 9, right magnetic isolation ring 10, right end cap 11, right bearing 12, left bearing 19, left outer shell 23, and right outer shell 24 are all made of non-magnetic materials.

[0041] In this embodiment, the rotating shaft 3, the right end pole shoe 13, the right end pole shoe 14, the right first pole shoe 15, the left first pole shoe 16, the left pole shoe 17, and the left end pole shoe 18 are all made of magnetically conductive material.

[0042] During the experiment, the rotating shaft 3 applies air pressure to the sealing assembly after rotation. When the pressure increases to the point of breaking through each stage of magnetic fluid 20, the pressure change in the sealing chamber of each stage of magnetic fluid can be measured by an external pressure gauge connected through the pressure measuring hole 25. By disassembling and assembling the left pole shoe 17, the left outer shell 23, the right pole shoe 14, and the right outer shell 24, the sealing stage can be adjusted to study the changes in pressure resistance and the sealing failure process under different stages.

[0043] Based on the above description, those skilled in the art are already able to implement it.

[0044] Furthermore, it should be noted that the specific embodiments described in this specification may differ in the shape and name of their parts and components. The above description is merely illustrative of the structure of the present invention. All equivalent or simple variations made based on the structure, features, and principles described in this patent concept are included within the protection scope of this patent. Those skilled in the art can make various modifications or additions to the described specific embodiments or use similar methods to substitute them, as long as they do not deviate from the structure of the present invention or exceed the scope defined in these claims, all of which should fall within the protection scope of this invention.

Claims

1. A modular, multi-stage magnetic liquid rotary sealing experimental device, comprising a motor (1), a coupling (2), a rotating shaft (3), a left end cover (4), a left-side screw (6), a middle section of the outer shell (7), a right-side screw (9), a right end cover (11), a right bearing (12), a left bearing (19), a magnetic liquid (20), a left-side outer shell (23), and a right-side outer shell (24), wherein the rotating shaft (3) is connected to the motor (1) via the coupling (2), characterized in that: It also includes a right end pole shoe (13), a right end pole shoe (14), a right first pole shoe (15), a left first pole shoe (16), a left pole shoe (17), a left end pole shoe (18), a pressure measuring hole (25), an annular permanent magnet (8), a left magnetic isolation ring (5), a right magnetic isolation ring (10), a right rubber sealing ring (21), and a left rubber sealing ring (22). The left first pole shoe (16), left pole shoe (17), left end pole shoe (18), right first pole shoe (15), right pole shoe (14), and right end pole shoe (13) are all the same shape and have pole teeth on their inner circumference. One end face has a circular boss, and the other end face has a circular... The groove has a circular groove on one side and an annular sealing groove on the outer circumference. The outer circumference has a threaded hole and a pressure measuring hole (25). The boss forms a concave-convex fit. The left pole shoe (17), the left end pole shoe (18), and the left magnetic isolation ring (5) are in sequence close to the left end face boss of the left first pole shoe (16) to form a concave-convex fit with each other. The left end groove of the right first pole shoe (15) is in close contact with the right end face boss of the annular permanent magnet (8) to form a concave-convex fit. The right pole shoe (14), the right end pole shoe (13), and the right magnetic isolation ring (10) are in sequence close to the right end face boss of the right first pole shoe (15) to form a concave-convex fit with each other. The left rubber sealing ring (22) is embedded in the left first pole shoe. The annular sealing grooves on the outer circumference of the first pole shoe (16), the left pole shoe (17), and the left end pole shoe (18) are used to embed the right rubber sealing ring (21) into the annular sealing grooves on the outer circumference of the right first pole shoe (15), the right pole shoe (14), and the right end pole shoe (13); the rotating shaft (3), the left end cover (4), the left magnetic isolation ring (5), the left screw (6), the middle section of the outer shell (7), the annular permanent magnet (8), the right screw (9), the right magnetic isolation ring (10), the right end cover (11), the right bearing (12), the right end pole shoe (13), the right pole shoe (14), the right first pole shoe (15), the left first pole shoe (16), and the left pole shoe (17). The sealing assembly consists of the left end pole shoe (18), left bearing (19), magnetic fluid (20), right rubber seal (21), left rubber seal (22), left outer shell (23), and right outer shell (24). The left outer shell (23) is close to the right end face of the left end cover (4) and is installed on the outer circumference of the left pole shoe (17). It is connected and fixed to the left pole shoe (17) by the left screw (6). The right outer shell (24) is close to the right end face of the right end cover (11) and is connected and fixed to the right pole shoe (14) by the right screw (9). The right end groove of the left first pole shoe (16) is close to the left end face protrusion of the annular permanent magnet (8) to form a concave-convex fit.

2. The modular combined multi-stage magnetic liquid rotary sealing experimental device according to claim 1, characterized in that: The left pole shoe (17) is used in conjunction with the left outer shell (23), and the right pole shoe (14) is used in conjunction with the right outer shell (24).

3. The modular combined multi-stage magnetic liquid rotary sealing experimental device according to claim 1, characterized in that: The annular permanent magnet (8), the left first pole piece (16), the left pole piece (17), the left end pole piece (18), the rotating shaft (3), the right end pole piece (13), the right pole piece (14), and the right first pole piece (15) form a magnetic circuit.

4. The modular combined multi-stage magnetic liquid rotary sealing experimental device according to claim 1, characterized in that: The magnetic fluid (20) is injected into the gap between the pole teeth and the shaft (3) of each of the left first pole shoe (16), left pole shoe (17), left end pole shoe (18), right first pole shoe (15), right pole shoe (14), and right end pole shoe (13).

5. The modular combined multi-stage magnetic liquid rotary sealing experimental device according to claim 1, characterized in that: The left bearing (19) is installed in the inner hole groove of the left end cover (4), close to the left end face of the left magnetic shielding ring (5), and the right bearing (12) is installed in the inner hole groove of the right end cover (11), close to the right end face of the right magnetic shielding ring (10).

6. The modular combined multi-stage magnetic liquid rotary sealing experimental device according to claim 1, characterized in that: The right end face of the left magnetic isolation ring (5) is provided with a circular groove for engaging with the left end face of the left end pole shoe (18), and the left end face of the right magnetic isolation ring (10) is provided with a circular groove for engaging with the right end face of the right end pole shoe (13).

7. The modular combined multi-stage magnetic liquid rotary sealing experimental device according to claim 1, characterized in that: The left end cap (4), left magnetic ring (5), left screw (6), middle section of the outer shell (7), right screw (9), right magnetic ring (10), right end cap (11), right bearing (12), left bearing (19), left outer shell (23), and right outer shell (24) are all made of non-magnetic materials.

8. The modular combined multi-stage magnetic liquid rotary sealing experimental device according to claim 1, characterized in that: The rotating shaft (3), right end pole shoe (13), right end pole shoe (14), right first pole shoe (15), left first pole shoe (16), left pole shoe (17), and left end pole shoe (18) are all made of magnetic material.

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