High-pressure-resistant magnetic liquid sealing device

Abstract

The utility model discloses a high-pressure-resistant magnetic liquid sealing device, and belongs to the technical field of mechanical engineering sealing. The device mainly comprises a rotating shaft, a shell, a middle-layer pole shoe, a middle-layer permanent magnet, an outer-layer pole shoe, an outer-layer permanent magnet, magnetic liquid, an inner-layer pole shoe and an inner-layer permanent magnet. The sealing combinations of different pole shoes and permanent magnets are arranged in a layered manner in the radial direction, so that the pressure resistance of the sealing device is improved on the premise that the axial size of the sealing device is not increased.

Description

Technical Field

[0001] The utility model relates to a high-voltage magnetic fluid sealing device, which is particularly suitable for rotary sealing parts with requirements for voltage resistance ability. Background Art

[0002] Magnetic fluid sealing has the advantages of zero leakage, long service life and low friction, and is widely used in the field of sealing. However, in actual applications, ordinary magnetic fluid sealing devices have the problem of low voltage resistance ability. Although increasing the number of pole shoes and permanent magnets axially can improve the voltage resistance ability, it greatly increases the axial size of the magnetic fluid sealing device, and in some cases, this method is not applicable. Therefore, a high-voltage magnetic fluid sealing device with pole shoes and permanent magnets arranged in layers radially is proposed. Summary of the Invention

[0003] The purpose of the utility model is to provide a high-voltage magnetic fluid sealing device, which improves its voltage resistance ability without increasing the overall axial size of the sealing device.

[0004] The technical solution adopted by the utility model is: a high-voltage magnetic fluid sealing device, which includes a rotating shaft (1), a housing (2), an intermediate layer left bearing (3), an intermediate layer elastic retaining ring (4), an intermediate layer magnetic isolation ring I (5), an intermediate layer pole shoe I (6), an intermediate layer permanent magnet I (7), an intermediate layer pole shoe II (8), an intermediate layer pole shoe III (9), an intermediate layer permanent magnet II (10), an intermediate layer pole shoe IV (11), an intermediate layer magnetic isolation ring II (12), an intermediate layer right bearing (13), an outer layer elastic retaining ring I (14), an outer layer left bearing (15), an outer layer magnetic isolation ring I (16), an outer layer pole shoe I (17), an outer layer permanent magnet I (18), an outer layer pole shoe II (19), an outer layer pole shoe III (20), an outer layer permanent magnet II (21), an outer layer pole shoe IV (22), an outer layer magnetic isolation ring II (23), an outer layer right bearing (24), an outer layer elastic retaining ring II (25), an outer layer elastic retaining ring III (26), magnetic fluid (27), an inner layer elastic retaining ring I (28), an inner layer elastic retaining ring II (29), an inner layer left bearing (30), an inner layer magnetic isolation ring I (31), an inner layer pole shoe I (32), an inner layer permanent magnet I (33), an inner layer pole shoe II (34), an inner layer pole shoe III (35), an inner layer permanent magnet II (36), an inner layer pole shoe IV (37), an inner layer magnetic isolation ring II (38), and an inner layer right bearing (39);

[0005] Connections between the various parts of the device: O-ring seals are installed in the annular grooves on the outer ring surfaces of the intermediate pole shoes I (6), intermediate pole shoes II (8), intermediate pole shoes III (9), and intermediate pole shoes IV (11); O-ring seals are installed in the annular grooves on the inner ring surfaces of the outer pole shoes I (17), outer pole shoes II (19), outer pole shoes III (20), outer pole shoes IV (22), inner pole shoes I (32), inner pole shoes II (34), inner pole shoes III (35), and inner pole shoes IV (37).

[0006] Tooth-shaped structures are machined on the inner ring surfaces of the intermediate pole shoes I (6), intermediate pole shoes II (8), intermediate pole shoes III (9), and intermediate pole shoes IV (11); tooth-shaped structures are machined on the outer ring surfaces of the outer pole shoes I (17), outer pole shoes II (19), outer pole shoes III (20), outer pole shoes IV (22), inner pole shoes I (32), inner pole shoes II (34), inner pole shoes III (35), and inner pole shoes IV (37).

[0007] Taking the central axis of the rotating shaft (1) as the center line, an annular space I is machined on the rotating shaft (1), making the cross-section of the rotating shaft (1) in the shape of "E".

[0008] Install the intermediate right bearing (13), intermediate magnetic isolation ring II (12), intermediate pole shoe IV (11), intermediate permanent magnet II (10), intermediate pole shoe III (9), intermediate pole shoe II (8), intermediate permanent magnet I (7), intermediate pole shoe I (6), intermediate magnetic isolation ring I (5), and intermediate left bearing (3) into the annular space I in sequence along the outer side wall of the annular space I of the rotating shaft (1); install the intermediate snap ring (4) into the annular groove on the outer side wall of the annular space I of the rotating shaft (1) to press the outer ring of the intermediate left bearing (3).

[0009] Install the inner right bearing (39), inner magnetic isolation ring II (38), inner pole shoe IV (37), inner permanent magnet II (36), inner pole shoe III (35), inner pole shoe II (34), inner permanent magnet I (33), inner pole shoe I (32), inner magnetic isolation ring I (31), and inner left bearing (30) into the annular space I in sequence along the inner side wall of the annular space I of the rotating shaft (1); install the inner snap ring II (29) into the annular groove on the inner side wall of the annular space I of the rotating shaft (1) to press the inner ring of the inner left bearing (30).

[0010] Install the outer elastic retaining ring Ⅲ (26) in the annular groove on the right side of the outer ring surface of the rotating shaft (1); install the outer right bearing (24), outer magnetic isolation ring Ⅱ (23), outer pole shoe Ⅳ (22), outer permanent magnet Ⅱ (21), outer pole shoe Ⅲ (20), outer pole shoe Ⅱ (19), outer permanent magnet Ⅰ (18), outer pole shoe Ⅰ (17), outer magnetic isolation ring Ⅰ (16), and outer left bearing (15) in sequence on the outer ring surface of the rotating shaft (1); install the outer elastic retaining ring Ⅰ (14) in the annular groove on the left side of the outer ring surface of the rotating shaft (1) to press the inner ring of the outer left bearing (15).

[0011] With the central axis of the housing (2) as the center line, a through hole and an annular space Ⅱ are respectively machined, so that the cross-section of the housing (2) is in the shape of "U U".

[0012] Nest the annular space Ⅱ of the housing (2) and the annular space Ⅰ of the rotating shaft (1) with each other; install the outer elastic retaining ring Ⅱ (25) in the annular groove on the outer side wall of the annular space Ⅱ of the housing (2); install the inner elastic retaining ring Ⅰ (28) in the annular space on the inner wall of the through hole of the housing (2).

[0013] Inject magnetic fluid (27) into the tooth-shaped structures of the pole shoes in the inner layer, middle layer, and outer layer to seal the sealing gap.

[0014] The housing (2), middle layer pole shoe Ⅰ (6), middle layer pole shoe Ⅱ (8), middle layer pole shoe Ⅲ (9), middle layer pole shoe Ⅳ (11), outer layer pole shoe Ⅰ (17), outer layer pole shoe Ⅱ (19), outer layer pole shoe Ⅲ (20), outer layer pole shoe Ⅳ (22), inner layer pole shoe Ⅰ (32), inner layer pole shoe Ⅱ (34), inner layer pole shoe Ⅲ (35), and inner layer pole shoe Ⅳ (37) are made of magnetic conductive materials.

[0015] The rotating shaft (1), middle layer magnetic isolation ring Ⅰ (5), middle layer magnetic isolation ring Ⅱ (12), outer layer magnetic isolation ring Ⅰ (16), outer layer magnetic isolation ring Ⅱ (23), inner layer magnetic isolation ring Ⅰ (31), and inner layer magnetic isolation ring Ⅱ (38) are made of non-magnetic conductive materials.

[0016] The magnetization directions of the middle layer permanent magnet Ⅰ (7) and the middle layer permanent magnet Ⅱ (10) are both axial, but the magnetic pole directions are opposite; the magnetization directions of the outer layer permanent magnet Ⅰ (18) and the outer layer permanent magnet Ⅱ (21) are both axial, but the magnetic pole directions are opposite; the magnetization directions of the inner layer permanent magnet Ⅰ (33) and the inner layer permanent magnet Ⅱ (36) are both axial, but the magnetic pole directions are opposite.

[0017] Compared with the ordinary magnetic fluid sealing device, the beneficial effect of the present utility model is that it can improve its pressure resistance without increasing the overall axial dimension of the sealing device. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the magnetic fluid sealing device of the present utility model;

[0019] Figure 1 Among them: rotating shaft (1), outer shell (2), intermediate layer left bearing (3), intermediate layer snap ring (4), intermediate layer magnetic isolation ring I (5), intermediate layer pole shoe I (6), intermediate layer permanent magnet I (7), intermediate layer pole shoe II (8), intermediate layer pole shoe III (9), intermediate layer permanent magnet II (10), intermediate layer pole shoe IV (11), intermediate layer magnetic isolation ring II (12), intermediate layer right bearing (13), outer layer snap ring I (14), outer layer left bearing (15), outer layer magnetic isolation ring I (16), outer layer pole shoe I (17), outer layer permanent magnet I (18), outer layer pole shoe II (19), outer layer pole shoe III (20), outer layer permanent magnet II (21), outer layer pole shoe IV (22), outer layer magnetic isolation ring II (23), outer layer right bearing (24), outer layer snap ring II (25), outer layer snap ring III (26), magnetic fluid (27), inner layer snap ring I (28), inner layer snap ring II (29), inner layer left bearing (30), inner layer magnetic isolation ring I (31), inner layer pole shoe I (32), inner layer permanent magnet I (33), inner layer pole shoe II (34), inner layer pole shoe III (35), inner layer permanent magnet II (36), inner layer pole shoe IV (37), inner layer magnetic isolation ring II (38), inner layer right bearing (39). Specific embodiments

[0020] The present utility model will be further described with reference to the accompanying drawings as the specific embodiments:

[0021] A high-voltage-resistant magnetic fluid sealing device, characterized in that the sealing device comprises: 1. a rotating shaft (1), a housing (2), an intermediate layer left bearing (3), an intermediate layer snap ring (4), an intermediate layer magnetic isolation ring I (5), an intermediate layer pole shoe I (6), an intermediate layer permanent magnet I (7), an intermediate layer pole shoe II (8), an intermediate layer pole shoe III (9), an intermediate layer permanent magnet II (10), an intermediate layer pole shoe IV (11), an intermediate layer magnetic isolation ring II (12), an intermediate layer right bearing (13), an outer layer snap ring I (14), an outer layer left bearing (15), an outer layer magnetic isolation ring I (16), an outer layer pole shoe I (17), an outer layer permanent magnet I (18), an outer layer pole shoe II (19), an outer layer pole shoe III (20), an outer layer permanent magnet II (21), an outer layer pole shoe IV (22), an outer layer magnetic isolation ring II (23), an outer layer right bearing (24), an outer layer snap ring II (25), an outer layer snap ring III (26), magnetic fluid (27), an inner layer snap ring I (28), an inner layer snap ring II (29), an inner layer left bearing (30), an inner layer magnetic isolation ring I (31), an inner layer pole shoe I (32), an inner layer permanent magnet I (33), an inner layer pole shoe II (34), an inner layer pole shoe III (35), an inner layer permanent magnet II (36), an inner layer pole shoe IV (37), an inner layer magnetic isolation ring II (38), an inner layer right bearing (39);

[0022] The connections between the various parts constituting the device: O-ring seals are assembled in the annular grooves on the outer ring surfaces of the intermediate layer pole shoe I (6), the intermediate layer pole shoe II (8), the intermediate layer pole shoe III (9), and the intermediate layer pole shoe IV (11); O-ring seals are assembled in the annular grooves on the inner ring surfaces of the outer layer pole shoe I (17), the outer layer pole shoe II (19), the outer layer pole shoe III (20), the outer layer pole shoe IV (22), the inner layer pole shoe I (32), the inner layer pole shoe II (34), the inner layer pole shoe III (35), and the inner layer pole shoe IV (37);

[0023] Tooth-shaped structures are machined on the inner ring surfaces of the intermediate layer pole shoe I (6), the intermediate layer pole shoe II (8), the intermediate layer pole shoe III (9), and the intermediate layer pole shoe IV (11); tooth-shaped structures are machined on the outer ring surfaces of the outer layer pole shoe I (17), the outer layer pole shoe II (19), the outer layer pole shoe III (20), the outer layer pole shoe IV (22), the inner layer pole shoe I (32), the inner layer pole shoe II (34), the inner layer pole shoe III (35), and the inner layer pole shoe IV (37);

[0024] Taking the central axis of the rotating shaft (1) as the center line, an annular space I is machined on the rotating shaft (1) so that the cross-section of the rotating shaft (1) is in an "E" shape;

[0025] Install the middle layer right bearing (13), middle layer magnetic isolation ring II (12), middle layer pole shoe IV (11), middle layer permanent magnet II (10), middle layer pole shoe III (9), middle layer pole shoe II (8), middle layer permanent magnet I (7), middle layer pole shoe I (6), middle layer magnetic isolation ring I (5), and middle layer left bearing (3) into the annular space I along the outer side wall of the annular space I of the rotating shaft (1) in sequence; install the middle layer snap ring (4) into the annular groove on the outer side wall of the annular space I of the rotating shaft (1) to compress the outer ring of the middle layer left bearing (3).

[0026] Install the inner layer right bearing (39), inner layer magnetic isolation ring II (38), inner layer pole shoe IV (37), inner layer permanent magnet II (36), inner layer pole shoe III (35), inner layer pole shoe II (34), inner layer permanent magnet I (33), inner layer pole shoe I (32), inner layer magnetic isolation ring I (31), and inner layer left bearing (30) into the annular space I along the inner side wall of the annular space I of the rotating shaft (1) in sequence; install the inner layer snap ring II (29) into the annular groove on the inner side wall of the annular space I of the rotating shaft (1) to compress the inner ring of the inner layer left bearing (30).

[0027] Install the outer layer snap ring III (26) into the annular groove on the right side of the outer ring surface of the rotating shaft (1); install the outer layer right bearing (24), outer layer magnetic isolation ring II (23), outer layer pole shoe IV (22), outer layer permanent magnet II (21), outer layer pole shoe III (20), outer layer pole shoe II (19), outer layer permanent magnet I (18), outer layer pole shoe I (17), outer layer magnetic isolation ring I (16), and outer layer left bearing (15) on the outer ring surface of the rotating shaft (1) in sequence; install the outer layer snap ring I (14) into the annular groove on the left side of the outer ring surface of the rotating shaft (1) to compress the inner ring of the outer layer left bearing (15).

[0028] With the central axis of the outer shell (2) as the center line, a through hole and an annular space II are respectively machined, so that the cross-section of the outer shell (2) is in the shape of "U U".

[0029] Nest the annular space II of the outer shell (2) and the annular space I of the rotating shaft (1) with each other; install the outer layer snap ring II (25) into the annular groove on the outer side wall of the annular space II of the outer shell (2); install the inner layer snap ring I (28) into the annular space on the inner wall of the through hole of the outer shell (2).

[0030] Inject magnetic fluid (27) into the tooth-shaped structures of the pole shoes of the inner layer, middle layer, and outer layer to seal the sealing gap.

[0031] The outer shell (2), the intermediate layer pole shoe I (6), the intermediate layer pole shoe II (8), the intermediate layer pole shoe III (9), the intermediate layer pole shoe IV (11), the outer layer pole shoe I (17), the outer layer pole shoe II (19), the outer layer pole shoe III (20), the outer layer pole shoe IV (22), the inner layer pole shoe I (32), the inner layer pole shoe II (34), the inner layer pole shoe III (35), and the inner layer pole shoe IV (37) are made of magnetically conductive 2Cr13;

[0032] The rotating shaft (1), the intermediate layer magnetic isolation ring I (5), the intermediate layer magnetic isolation ring II (12), the outer layer magnetic isolation ring I (16), the outer layer magnetic isolation ring II (23), the inner layer magnetic isolation ring I (31), and the inner layer magnetic isolation ring II (38) are made of non-magnetically conductive stainless steel 304.

[0033] The left side of the intermediate layer permanent magnet I (7) is the N pole, and the right side is the S pole; the left side of the intermediate layer permanent magnet II (10) is the S pole, and the right side is the N pole;

[0034] The left side of the outer layer permanent magnet I (18) is the N pole, and the right side is the S pole; the left side of the outer layer permanent magnet II (21) is the S pole, and the right side is the N pole;

[0035] The left side of the inner layer permanent magnet I (33) is the N pole, and the right side is the S pole; the left side of the inner layer permanent magnet II (36) is the S pole, and the right side is the N pole;

[0036] Taking the combination of one group of pole shoes and permanent magnets as an example to illustrate the composition of the magnetic circuit: The magnetic induction lines emitted from the N pole of the intermediate layer permanent magnet I (7) pass through the intermediate layer pole shoe I (6), the magnetic fluid (27), the outer shell (2), and the intermediate layer pole shoe II (8) in sequence, and finally return to the S pole of the intermediate layer permanent magnet I (7).

Claims

1. A high-pressure magnetic liquid sealing device, characterized in that: The sealing device comprises: a rotating shaft (1), a housing (2), an intermediate left bearing (3), an intermediate elastic retaining ring (4), an intermediate magnetic isolation ring I (5), an intermediate pole shoe I (6), an intermediate permanent magnet I (7), an intermediate pole shoe II (8), an intermediate pole shoe III (9), an intermediate permanent magnet II (10), an intermediate pole shoe IV (11), an intermediate magnetic isolation ring II (12), an intermediate right bearing (13), an outer elastic retaining ring I (14), an outer left bearing (15), an outer magnetic isolation ring I (16), an outer pole shoe I (17), an outer permanent magnet I (18), an outer pole shoe II (19), an outer pole shoe III (20), outer layer permanent magnet II (21), outer layer pole shoe IV (22), outer layer magnetic isolation ring II (23), outer layer right bearing (24), outer layer elastic retaining ring II (25), outer layer elastic retaining ring III (26), magnetic liquid (27), inner layer elastic retaining ring I (28), inner layer elastic retaining ring II (29), inner layer left bearing (30), inner layer magnetic isolation ring I (31), inner layer pole shoe I (32), inner layer permanent magnet I (33), inner layer pole shoe II (34), inner layer pole shoe III (35), inner layer permanent magnet II (36), inner layer pole shoe IV (37), inner layer magnetic isolation ring II (38), inner layer right bearing (39); The connections between the various parts of the device are formed as follows: the annular grooves on the outer annular surfaces of the intermediate layer pole shoe I (6), the intermediate layer pole shoe II (8), the intermediate layer pole shoe III (9), and the intermediate layer pole shoe IV (11) are all equipped with O-type sealing rings; the annular grooves on the inner annular surfaces of the outer layer pole shoe I (17), the outer layer pole shoe II (19), the outer layer pole shoe III (20), the outer layer pole shoe IV (22), the inner layer pole shoe I (32), the inner layer pole shoe II (34), the inner layer pole shoe III (35), and the inner layer pole shoe IV (37) are all equipped with O-type sealing rings; The inner annular surfaces of the intermediate layer pole shoe I (6), the intermediate layer pole shoe II (8), the intermediate layer pole shoe III (9), and the intermediate layer pole shoe IV (11) are processed with a toothed structure; the outer annular surfaces of the outer layer pole shoe I (17), the outer layer pole shoe II (19), the outer layer pole shoe III (20), the outer layer pole shoe IV (22), the inner layer pole shoe I (32), the inner layer pole shoe II (34), the inner layer pole shoe III (35), and the inner layer pole shoe IV (37) are processed with a toothed structure; With the central axis of the rotating shaft (1) as the center line, an annular space I is machined on the rotating shaft (1), so that the cross section of the rotating shaft (1) is in an "E" shape; The middle layer right bearing (13), the middle layer magnetic isolation ring II (12), the middle layer pole shoe IV (11), the middle layer permanent magnet II (10), the middle layer pole shoe III (9), the middle layer pole shoe II (8), the middle layer permanent magnet I (7), the middle layer pole shoe I (6), the middle layer magnetic isolation ring I (5), and the middle layer left bearing (3) are sequentially installed into the annular space I along the outer wall of the annular space I of the rotating shaft (1); the middle layer elastic retaining ring (4) is installed in the annular groove of the outer wall of the annular space I of the rotating shaft (1) to press the outer ring of the middle layer left bearing (3); The inner right bearing (39), the inner magnetic isolation ring II (38), the inner pole shoe IV (37), the inner permanent magnet II (36), the inner pole shoe III (35), the inner pole shoe II (34), the inner permanent magnet I (33), the inner pole shoe I (32), the inner magnetic isolation ring I (31), and the inner left bearing (30) are sequentially installed into the annular space I along the inner side wall of the annular space I of the rotating shaft (1); the inner elastic retaining ring II (29) is installed in the annular groove of the inner side wall of the annular space I of the rotating shaft (1) to press the inner ring of the inner left bearing (30); The outer elastic retaining ring III (26) is installed in the annular groove on the right side of the outer ring surface of the rotating shaft (1); the outer right bearing (24), the outer magnetic isolation ring II (23), the outer pole shoe IV (22), the outer permanent magnet II (21), the outer pole shoe III (20), the outer pole shoe II (19), the outer permanent magnet I (18), the outer pole shoe I (17), the outer magnetic isolation ring I (16), and the outer left bearing (15) are installed in sequence on the outer ring surface of the rotating shaft (1); the outer elastic retaining ring I (14) is installed in the annular groove on the left side of the outer ring surface of the rotating shaft (1) to press the inner ring of the outer left bearing (15); With the central axis of the housing (2) as the center line, a through hole and an annular space II are respectively processed so that the cross section of the housing (2) is in a "UU" shape; The annular space II of the housing (2) and the annular space I of the rotating shaft (1) are mutually nested; the outer elastic retaining ring II (25) is installed in the annular groove of the outer side wall of the annular space II of the housing (2); and the inner elastic retaining ring I (28) is installed in the annular space of the inner wall of the through hole of the housing (2); Magnetic liquid (27) is injected under the tooth-shaped structures of the pole shoes of the inner layer, the middle layer and the outer layer to block the sealing gap.

2. A high-pressure magnetic liquid sealing device according to claim 1, characterized in that: The outer shell (2), the intermediate layer pole shoe I (6), the intermediate layer pole shoe II (8), the intermediate layer pole shoe III (9), the intermediate layer pole shoe IV (11), the outer layer pole shoe I (17), the outer layer pole shoe II (19), the outer layer pole shoe III (20), the outer layer pole shoe IV (22), the inner layer pole shoe I (32), the inner layer pole shoe II (34), the inner layer pole shoe III (35), and the inner layer pole shoe IV (37) are made of magnetic conductive materials; The rotating shaft (1), the middle layer magnetic isolation ring I (5), the middle layer magnetic isolation ring II (12), the outer layer magnetic isolation ring I (16), the outer layer magnetic isolation ring II (23), the inner layer magnetic isolation ring I (31), and the inner layer magnetic isolation ring II (38) are made of non-magnetic conductive materials.

3. A high-pressure magnetic liquid sealing device according to claim 1, characterized in that: The magnetizing directions of the intermediate layer permanent magnets I (7) and II (10) are both axial, but the magnetic poles are in opposite directions; the magnetizing directions of the outer layer permanent magnets I (18) and II (21) are both axial, but the magnetic poles are in opposite directions; the magnetizing directions of the inner layer permanent magnets I (33) and II (36) are both axial, but the magnetic poles are in opposite directions.

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