High-pressure-resistant magnetic liquid sealing device

Abstract

The invention discloses a high-pressure-resistant magnetic liquid sealing device, and belongs to the field of high-performance sealing devices in strategic emerging industry classification. The device comprises a rotating shaft, an elastic check ring I, a left bearing, an end cover, a shell, a permanent magnet I, a permanent magnet II, a permanent magnet III, a permanent magnet IV, a permanent magnet V, a permanent magnet VI, a permanent magnet VII, a sealing ring I, a sealing ring II, a right magnetism isolating sleeve, a sealing ring III, a right bearing, a pole shoe I, a magnetism isolating plate I, a pole shoe II, a magnetism isolating plate II, a pole shoe III, a magnetism isolating plate III, a pole shoe IV, a sealing ring IV and a left magnetism isolating sleeve. A sealing ring V; the Halbach array is utilized, the pole shoes and the permanent magnets are arranged in a layered mode in the radial direction, and the axial length of the sealing device is reduced on the basis that the high pressure resistance is guaranteed; the Halbach array generates a unilateral strong magnetic field, so that the magnetic leakage at the shell is reduced, and the influence on a magnetic sensitive component is reduced.

Description

Technical Field

[0001] The invention relates to a high-pressure resistant magnetic liquid sealing device, belonging to the field of high-performance sealing devices in the classification of strategic emerging industries. Background Art

[0002] The magnetic liquid sealing device has the advantages of zero leakage, long life, low friction, low torque, etc., and is widely used in the sealing field, especially in the low-pressure sealing field, because of its superior sealing performance. The magnetic liquid sealing device uses the pole tooth structure to generate a gradient magnetic field in the sealing gap, and binds the magnetic liquid to form an "O"-shaped liquid sealing ring to resist pressure. In high-pressure sealing occasions, the general magnetic liquid sealing device adopts a series structure of "pole shoe-permanent magnet-......-pole shoe" or a series of multiple "pole shoe-permanent magnet-pole shoe" structures to improve the pressure resistance, but this method will increase the axial length of the sealing device, so a magnetic liquid sealing device with a Halbach array is proposed. Summary of the invention

[0003] The purpose of the present invention is to provide a magnetic liquid sealing device that can improve the pressure resistance. The Halbach array is used to generate a unilateral strong magnetic field. There is no permanent magnet between the pole shoes of the sealing device, which saves the length of the thickness of the permanent magnet in the axial direction. Although the thickness of the thin 304 stainless steel is increased, the thickness of the 304 stainless steel that plays a magnetic isolation role (0.5-1mm) is smaller than the thickness of the permanent magnet used in general magnetic liquid sealing devices (>3mm).

[0004] The technical scheme adopted by the present invention is: a high-pressure resistant magnetic liquid sealing device, which comprises: a rotating shaft (1), an elastic retaining ring I (2), a left bearing (3), an end cover (4), a housing (5), a permanent magnet I (6), a permanent magnet II (7), a permanent magnet III (8), a permanent magnet IV (9), a permanent magnet V (10), a permanent magnet VI (11), a permanent magnet VII (12), a sealing ring I (13), a sealing ring II (14), a right magnetic isolation sleeve (15), a sealing ring III (16), a right bearing (17), a pole shoe I (18), a magnetic isolation plate I (19), a pole shoe II (20), a magnetic isolation plate II (21), a pole shoe III (22), a magnetic isolation plate III (23), a pole shoe IV (24), a sealing ring IV (25), a left magnetic isolation sleeve (26), and a sealing ring V (27).

[0005] The connection between the various parts of the device is formed as follows: the sealing ring I (13) is arranged in the annular groove on the outer ring surface of the right magnetic isolation sleeve (15), and the sealing ring III (16) is arranged in the annular groove on the left end surface of the right magnetic isolation sleeve (15); the sealing ring II (14) is arranged in the annular groove on the right end surface of the housing (5); the sealing ring V (27) is arranged in the annular groove on the outer ring surface of the left magnetic isolation sleeve (26), and the sealing ring IV (25) is arranged in the annular groove on the right end surface of the left magnetic isolation sleeve (26);

[0006] The right bearing (17), the right magnetic isolation sleeve (15), the permanent magnet VII (12), the permanent magnet VI (11), the permanent magnet V (10), the permanent magnet IV (9), the permanent magnet III (8), the permanent magnet II (7), and the permanent magnet I (6) are sequentially installed into the housing (5), and the magnetic pole directions of the permanent magnet VII (12), the permanent magnet VI (11), the permanent magnet V (10), the permanent magnet IV (9), the permanent magnet III (8), the permanent magnet II (7), and the permanent magnet I (6) conform to the Halbach array;

[0007] The pole shoe I (18), the magnetic isolation plate I (19), the pole shoe II (20), the magnetic isolation plate II (21), the pole shoe III (22), the magnetic isolation plate III (23), and the pole shoe IV (24) are welded or glued to form a sealing assembly to ensure that there is no leakage between the gaps between different materials, and a pole tooth structure is processed on the inner hole surface of the pole shoe I (18), the pole shoe II (20), the pole shoe III (22), and the pole shoe IV (24); the sealing assembly is installed in the inner holes of the permanent magnet VII (12), the permanent magnet VI (11), the permanent magnet V (10), the permanent magnet IV (9), the permanent magnet III (8), the permanent magnet II (7), and the permanent magnet I (6);

[0008] The left magnetic isolation sleeve (26) and the left bearing (3) are sequentially mounted in the housing (5); the end cover (4) is installed on the left end of the housing (5) by bolt connection, and the outer ring of the left bearing (3) is pressed tightly;

[0009] The assembled structure is mounted on the rotating shaft (1); the elastic retaining ring I (2) is installed in the groove on the rotating shaft (1) to press the inner ring of the left bearing (3);

[0010] The outer circumferential surfaces of the permanent magnets VII (12), VI (11), V (10), IV (9), III (8), II (7), and I (6) are tightly fitted with the inner hole surface of the housing (5); the outer circumferential surface of the sealing assembly is tightly fitted with the inner circumferential surfaces of the permanent magnets VII (12), VI (11), V (10), IV (9), III (8), II (7), and I (6);

[0011] There is a sealing gap between the top of the pole teeth on the inner circumferential surface of the pole shoe I (18), the pole shoe II (20), the pole shoe III (22) and the surface of the rotating shaft (1), and magnetic liquid is injected into the sealing gap.

[0012] The right magnetic isolation sleeve (15) and the left magnetic isolation sleeve (26) simultaneously press the outer layer permanent magnet VII (12), permanent magnet VI (11), permanent magnet V (10), permanent magnet IV (9), permanent magnet III (8), permanent magnet II (7), permanent magnet I (6) and the inner layer sealed assembly;

[0013] Except for the magnetic circuits on the left and right sides, the middle of any other magnetic circuit formed by the Halbach array corresponds to the magnetic isolation plate area in the sealing assembly, so that the magnetic circuit can pass through the rotating shaft (1).

[0014] The housing (5), the right magnetic isolation sleeve (15), the magnetic isolation plate I (19), the magnetic isolation plate II (21), the magnetic isolation plate III (23), and the left magnetic isolation sleeve (26) are made of non-magnetic conductive materials; the rotating shaft (1), the pole shoe I (18), the pole shoe II (20), the pole shoe III (22), and the pole shoe IV (24) are made of magnetic conductive materials.

[0015] Compared with the common serial magnetic liquid sealing device, the present invention has the following beneficial effects: 1. By utilizing the Halbach array, the pole shoes and the permanent magnets are arranged in layers in the radial direction, thereby reducing the axial length of the sealing device; 2. The Halbach array generates a unilateral strong magnetic field, thereby reducing the leakage magnetic flux at the housing (1) and reducing the influence on magnetic sensitive components. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of an invented high-pressure resistant magnetic liquid sealing device;

[0017] Figure 2 This is a magnetic field simulation diagram of the Halbach array and seal assembly using Comsol 16.1 software;

[0018] Figure 1 and Figure 2 In the figure: rotating shaft (1), elastic retaining ring I (2), left bearing (3), end cover (4), housing (5), permanent magnet I (6), permanent magnet II (7), permanent magnet III (8), permanent magnet IV (9), permanent magnet V (10), permanent magnet VI (11), permanent magnet VII (12), sealing ring I (13), sealing ring II (14), right magnetic isolation sleeve (15), sealing ring III (16), right bearing (17), pole shoe I (18), magnetic isolation plate I (19), pole shoe II (20), magnetic isolation plate II (21), pole shoe III (22), magnetic isolation plate III (23), pole shoe IV (24), sealing ring IV (25), left magnetic isolation sleeve (26), sealing ring V (27). DETAILED DESCRIPTION

[0019] The present invention is further described with reference to the accompanying drawings as specific implementation methods, but the Halbach array in this embodiment is only an annular permanent magnet array with seven rectangular cross-sections, and the cross-sections are triangular, trapezoidal, etc. and various combinations and variations of increasing or decreasing the number, which should be protected by this patent.

[0020] A high-pressure resistant magnetic liquid sealing device, characterized in that the sealing device comprises: a rotating shaft (1), an elastic retaining ring I (2), a left bearing (3), an end cover (4), a housing (5), a permanent magnet I (6), a permanent magnet II (7), a permanent magnet III (8), a permanent magnet IV (9), a permanent magnet V (10), a permanent magnet VI (11), a permanent magnet VII (12), a sealing ring I (13), a sealing ring II (14), a right magnetic isolation sleeve (15), a sealing ring III (16), a right bearing (17), a pole shoe I (18), a magnetic isolation plate I (19), a pole shoe II (20), a magnetic isolation plate II (21), a pole shoe III (22), a magnetic isolation plate III (23), a pole shoe IV (24), a sealing ring IV (25), a left magnetic isolation sleeve (26), and a sealing ring V (27);

[0021] The connection between the various parts of the device is formed as follows: the sealing ring I (13) is arranged in the annular groove on the outer ring surface of the right magnetic isolation sleeve (15), and the sealing ring III (16) is arranged in the annular groove on the left end surface of the right magnetic isolation sleeve (15); the sealing ring II (14) is arranged in the annular groove on the right end surface of the housing (5); the sealing ring V (27) is arranged in the annular groove on the outer ring surface of the left magnetic isolation sleeve (26), and the sealing ring IV (25) is arranged in the annular groove on the right end surface of the left magnetic isolation sleeve (26);

[0022] The right bearing (17), the right magnetic isolation sleeve (15), the permanent magnet VII (12), the permanent magnet VI (11), the permanent magnet V (10), the permanent magnet IV (9), the permanent magnet III (8), the permanent magnet II (7), and the permanent magnet I (6) are sequentially inserted into the housing (5), and the cross-sections of the permanent magnet VII (12), the permanent magnet VI (11), the permanent magnet V (10), the permanent magnet IV (9), the permanent magnet III (8), the permanent magnet II (7), and the permanent magnet I (6) are rectangular, and the magnetic pole directions conform to the Halbach array, and the magnetic pole directions are respectively lower N upper S, right N left S, upper N lower S, left N right S, lower N upper S, right N left S, and upper N lower S;

[0023] The pole shoe I (18), magnetic isolation plate I (19), pole shoe II (20), magnetic isolation plate II (21), pole shoe III (22), magnetic isolation plate III (23), and pole shoe IV (24) are welded or glued to form a sealing assembly to ensure that there is no leakage between the gaps between different materials, and a pole tooth structure is processed on the inner hole surface of the pole shoe I (18), pole shoe II (20), pole shoe III (22), and pole shoe IV (24); the sealing assembly is mounted in the inner holes of the permanent magnet VII (12), permanent magnet VI (11), permanent magnet V (10), permanent magnet IV (9), permanent magnet III (8), permanent magnet II (7), and permanent magnet I (6);

[0024] The left magnetic isolation sleeve (26) and the left bearing (3) are sequentially mounted in the housing (5); the end cover (4) is installed on the left end of the housing (5) by bolt connection, and presses the outer ring of the left bearing (3);

[0025] The assembled structure is mounted on the rotating shaft (1); the elastic retaining ring I (2) is installed in the groove on the rotating shaft (1) to press the inner ring of the left bearing (3);

[0026] The outer circumferential surfaces of the permanent magnets VII (12), VI (11), V (10), IV (9), III (8), II (7), and I (6) are tightly matched with the inner hole surface of the housing (5); the outer circumferential surface of the sealing assembly is tightly matched with the inner circumferential surface of the permanent magnets VII (12), VI (11), V (10), IV (9), III (8), II (7), and I (6);

[0027] There is a sealing gap between the top of the pole teeth on the inner circumferential surface of the pole shoe I (18), pole shoe II (20), pole shoe III (22) and pole shoe IV (24) and the surface of the rotating shaft (1), and magnetic liquid is injected into the sealing gap.

[0028] The right magnetic isolation sleeve (15) and the left magnetic isolation sleeve (26) simultaneously compress the outer layer permanent magnet VII (12), permanent magnet VI (11), permanent magnet V (10), permanent magnet IV (9), permanent magnet III (8), permanent magnet II (7), permanent magnet I (6) and the inner layer sealed assembly;

[0029] Except for the magnetic circuits on the left and right sides, the middle of any other magnetic circuit formed by the Halbach array corresponds to the magnetic isolation plate area in the sealing assembly, so that the magnetic circuit can pass through the rotating shaft (1).

[0030] The housing (5), the right magnetic isolation sleeve (15), the magnetic isolation plate I (19), the magnetic isolation plate II (21), the magnetic isolation plate III (23), and the left magnetic isolation sleeve (26) are made of non-magnetic conductive materials; and the rotating shaft (1), the pole shoe I (18), the pole shoe II (20), the pole shoe III (22), and the pole shoe IV (24) are made of magnetic conductive materials.

[0031] Figure 2In the figure, excluding the magnetic circuits on the left and right sides, the unilateral strong magnetic field of the Halbach array generates three magnetic circuits. The order of the components passed is: 1: permanent magnet VI (11), permanent magnet VII (12), pole shoe I (18), shaft (1), pole shoe II (20), permanent magnet V (10), permanent magnet VI (11); 2: permanent magnet IV (9), permanent magnet III (8), pole shoe III (22), shaft (1), pole shoe II (20), permanent magnet V (10), permanent magnet IV (9); 3: permanent magnet II (7), permanent magnet III (8), shaft (1), pole shoe IV (24), permanent magnet I (6), permanent magnet II (7).

Claims

1. A high-pressure resistant magnetic liquid sealing device, characterized in that: The device comprises: a rotating shaft (1), an elastic retaining ring I (2), a left bearing (3), an end cover (4), a housing (5), a permanent magnet I (6), a permanent magnet II (7), a permanent magnet III (8), a permanent magnet IV (9), a permanent magnet V (10), a permanent magnet VI (11), a permanent magnet VII (12), a sealing ring I (13), a sealing ring II (14), a right magnetic isolation sleeve (15), a sealing ring III (16), a right bearing (17), a pole shoe I (18), a magnetic isolation plate I (19), a pole shoe II (20), a magnetic isolation plate II (21), a pole shoe III (22), a magnetic isolation plate III (23), a pole shoe IV (24), a sealing ring IV (25), a left magnetic isolation sleeve (26), and a sealing ring V (27); The connection between the various parts of the device is formed as follows: the sealing ring I (13) is arranged in the annular groove on the outer ring surface of the right magnetic isolation sleeve (15), and the sealing ring III (16) is arranged in the annular groove on the left end surface of the right magnetic isolation sleeve (15); the sealing ring II (14) is arranged in the annular groove on the right end surface of the housing (5); the sealing ring V (27) is arranged in the annular groove on the outer ring surface of the left magnetic isolation sleeve (26), and the sealing ring IV (25) is arranged in the annular groove on the right end surface of the left magnetic isolation sleeve (26); The right bearing (17), the right magnetic isolation sleeve (15), the permanent magnet VII (12), the permanent magnet VI (11), the permanent magnet V (10), the permanent magnet IV (9), the permanent magnet III (8), the permanent magnet II (7), and the permanent magnet I (6) are sequentially installed into the housing (5), and the magnetic pole directions of the permanent magnet VII (12), the permanent magnet VI (11), the permanent magnet V (10), the permanent magnet IV (9), the permanent magnet III (8), the permanent magnet II (7), and the permanent magnet I (6) conform to the Halbach array; The pole shoe I (18), magnetic isolation plate I (19), pole shoe II (20), magnetic isolation plate II (21), pole shoe III (22), magnetic isolation plate III (23), and pole shoe IV (24) are welded or glued to form a sealing assembly to ensure that there is no leakage between the gaps between different materials, and a pole tooth structure is processed on the inner hole surface of the pole shoe I (18), pole shoe II (20), pole shoe III (22), and pole shoe IV (24); the sealing assembly is mounted in the inner holes of the permanent magnet VII (12), permanent magnet VI (11), permanent magnet V (10), permanent magnet IV (9), permanent magnet III (8), permanent magnet II (7), and permanent magnet I (6); The left magnetic isolation sleeve (26) and the left bearing (3) are sequentially mounted in the housing (5); the end cover (4) is installed on the left end of the housing (5) by bolt connection, and presses the outer ring of the left bearing (3); The assembled structure is mounted on the rotating shaft (1); the elastic retaining ring I (2) is installed in the groove on the rotating shaft (1) to press the inner ring of the left bearing (3); The outer circumferential surfaces of the permanent magnets VII (12), VI (11), V (10), IV (9), III (8), II (7), and I (6) are tightly matched with the inner hole surface of the housing (5); the outer circumferential surface of the sealing assembly is tightly matched with the inner circumferential surface of the permanent magnets VII (12), VI (11), V (10), IV (9), III (8), II (7), and I (6); There is a sealing gap between the top of the pole teeth on the inner circumferential surface of the pole shoe I (18), pole shoe II (20), pole shoe III (22) and pole shoe IV (24) and the surface of the rotating shaft (1), and magnetic liquid is injected into the sealing gap.

2. A high pressure resistant magnetic liquid sealing device according to claim 1, characterized in that: The right magnetic isolation sleeve (15) and the left magnetic isolation sleeve (26) simultaneously compress the outer layer permanent magnet VII (12), permanent magnet VI (11), permanent magnet V (10), permanent magnet IV (9), permanent magnet III (8), permanent magnet II (7), permanent magnet I (6) and the inner layer sealed assembly; Except for the magnetic circuits on the left and right sides, the middle of any other magnetic circuit formed by the Halbach array corresponds to the magnetic isolation plate area in the sealing assembly, so that the magnetic circuit can pass through the rotating shaft (1).

3. A high pressure resistant magnetic liquid sealing device according to claim 1, characterized in that: The housing (5), the right magnetic isolation sleeve (15), the magnetic isolation plate I (19), the magnetic isolation plate II (21), the magnetic isolation plate III (23), and the left magnetic isolation sleeve (26) are made of non-magnetic conductive materials; and the rotating shaft (1), the pole shoe I (18), the pole shoe II (20), the pole shoe III (22), and the pole shoe IV (24) are made of magnetic conductive materials.

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