High pressure resistant magnetic liquid seal

Abstract

The application relates to a high-pressure-resistant magnetic liquid sealing device, belonging to the field of high-performance sealing devices in the strategic emerging industry classification. The device comprises a rotating shaft, an elastic baffle 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 magnetic isolation sleeve, a sealing ring III, a right bearing, a pole shoe I, a magnetic isolation plate I, a pole shoe II, a magnetic isolation plate II, a pole shoe III, a magnetic isolation plate III, a pole shoe IV, a sealing ring IV, a left magnetic isolation sleeve and a sealing ring V. The application arranges the pole shoes and the permanent magnets in a radial direction in layers by using a Halbach array, reduces the axial length of the sealing device on the basis of guaranteeing the high-pressure resistance, generates a single-side strong magnetic field by the Halbach array, reduces the magnetic flux leakage at the shell and reduces the influence on the magnetic sensitive components.

Description

TECHNICAL FIELD

[0001] The application relates to a high-pressure-resistant magnetic liquid sealing device, belonging to the field of high-performance sealing devices in the strategic emerging industry classification. BACKGROUND

[0002] The magnetic liquid sealing device has the advantages of zero leakage, long service life, low friction and low torque, and is widely used in the sealing field, especially in the low-pressure sealing field, due to its superior sealing performance. The magnetic liquid sealing device utilizes 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 structure of series connection of multiple “pole shoe-permanent magnet-pole shoe” to improve the pressure resistance, but such a method increases the axial length of the sealing device. Therefore, the application provides a magnetic liquid sealing device with a Halbach array. SUMMARY

[0003] The application aims to provide a magnetic liquid sealing device capable of improving the pressure resistance, generating a single-side strong magnetic field by using the Halbach array, and eliminating the permanent magnets between the pole shoes of the sealing device, thereby saving the length of the thickness of the permanent magnets in the axial direction. Although the thickness of the thin 304 stainless steel is increased, the thickness (0.5-1 mm) of the 304 stainless steel for magnetic shielding is smaller than the thickness (>3 mm) of the permanent magnet used in the general magnetic liquid sealing device.

[0004] The technical scheme adopted by the application is as follows: a high-pressure-resistant magnetic liquid sealing device, which comprises: a rotating shaft 1, an elastic check ring I 2, a left bearing 3, an end cover 4, an outer shell 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 shielding sleeve 15, a sealing ring III 16, a right bearing 17, a pole shoe I 18, a magnetic shielding plate I 19, a pole shoe II 20, a magnetic shielding plate II 21, a pole shoe III 22, a magnetic shielding plate III 23, a pole shoe IV 24, a sealing ring IV 25, a left magnetic shielding sleeve 26 and a sealing ring V 27.

[0005] The connections between the parts of the device are as follows: the sealing ring I 13 is arranged in the annular groove on the outer ring surface of the right magnetic shielding sleeve 15, and the sealing ring III 16 is arranged in the annular groove on the left end surface of the right magnetic shielding sleeve 15; the sealing ring II 14 is arranged in the annular groove on the right end surface of the outer shell 5; the sealing ring V 27 is arranged in the annular groove on the outer ring surface of the left magnetic shielding sleeve 26, and the sealing ring IV 25 is arranged in the annular groove on the right end surface of the left magnetic shielding 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 sleeved into the shell 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 meet 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 form a sealed assembly, which guarantees that the gap between different materials is leakproof, and the inner hole surface in the area of the pole shoe I 18, the pole shoe II 20, the pole shoe III 22, and the pole shoe IV 24 is processed into a pole tooth structure; the sealed assembly is sleeved in the inner hole 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 sleeved in the shell 5; the end cover 4 is installed on the left end of the shell 5 through bolt connection, and presses the outer ring of the left bearing 3;

[0009] The above-mentioned installed structure is sleeved on the rotating shaft 1; the elastic retainer I 2 is installed in the groove on the rotating shaft 1 and presses the inner ring of the left bearing 3;

[0010] The outer circular surface 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 is tightly matched with the inner hole surface of the shell 5; the outer circular surface of the sealed assembly is tightly matched with the inner circular surface 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;

[0011] The top end of the pole tooth on the inner circular surface of the pole shoe I 18, the pole shoe II 20, the pole shoe III 22, and the pole shoe IV 24 has a sealed gap with the surface of the rotating shaft 1, and the magnetic liquid is injected into the sealed gap.

[0012] The right magnetic isolation sleeve 15 and the left magnetic isolation sleeve 26 press the outer layer 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 and the inner layer of the sealed assembly at the same time;

[0013] Except for the magnetic circuits on the leftmost and rightmost sides, the magnetic isolation plate area in the sealed assembly is correspondingly arranged in the middle of any magnetic circuit formed by the Halbach array, so that the magnetic circuit can pass through the rotating shaft 1.

[0014] The shell 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 non-magnetic 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 magnetic materials.

[0015] Compared with the common series magnetic liquid sealing device, the application has the advantages that: 1. The pole shoe and the permanent magnet are arranged in the radial direction by using the Halbach array, thereby reducing the axial length of the sealing device; 2. The Halbach array generates a single-side strong magnetic field, thereby reducing the leakage magnetic field at the shell 1 and reducing the influence on the magnetic sensitive components. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic diagram of a high-pressure-resistant magnetic liquid sealing device of the application;

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

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

[0019] The application is further described in the detailed description with reference to the accompanying drawings, but the Halbach array in the embodiment is only an array of seven annular permanent magnets with rectangular cross sections, and the cross sections can be triangular, trapezoidal, or other combinations and variants with different numbers, which should be included in the protection of the patent.

[0020] A high-pressure-resistant magnetic liquid sealing device, characterized in that the sealing device comprises: a rotating shaft 1, an elastic retainer ring I 2, a left bearing 3, an end cover 4, a shell 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 shielding sleeve 15, a sealing ring III 16, a right bearing 17, a pole shoe I 18, a magnetic shielding plate I 19, a pole shoe II 20, a magnetic shielding plate II 21, a pole shoe III 22, a magnetic shielding plate III 23, a pole shoe IV 24, a sealing ring IV 25, a left magnetic shielding sleeve 26, and a sealing ring V 27.

[0021] The connection between the parts of the device is constituted by: the sealing ring Ⅰ 13 is arranged in the annular groove of the outer surface of the right magnetic isolation sleeve 15, the sealing ring Ⅲ 16 is arranged in the annular groove of the left end surface of the right magnetic isolation sleeve 15; the sealing ring Ⅱ 14 is arranged in the annular groove of the right end surface of the shell 5; the sealing ring Ⅴ 27 is arranged in the annular groove of the outer surface of the left magnetic isolation sleeve 26, and the sealing ring Ⅳ 25 is arranged in the annular groove of 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 sleeved into the shell 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, 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 constitute a sealing assembly, so as to ensure that the gap between different materials is leakproof, and the inner hole surface in the area of the pole shoe Ⅰ 18, the pole shoe Ⅱ 20, the pole shoe Ⅲ 22 and the pole shoe Ⅳ 24 is processed into a pole tooth structure; the sealing assembly is sleeved in the inner hole 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.

[0024] The left magnetic isolation sleeve 26 and the left bearing 3 are sequentially sleeved in the shell 5; the end cover 4 is installed on the left end of the shell 5 through bolt connection, and the outer ring of the left bearing 3 is pressed tightly;

[0025] The structure is sleeved on the rotating shaft 1; the elastic stop ring Ⅰ 2 is installed in the groove on the rotating shaft 1 and presses the inner ring of the left bearing 3 tightly.

[0026] The outer circular surface 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 is tightly matched with the inner hole surface of the shell 5; the outer circular surface of the sealing assembly is tightly matched with the inner circular surface 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.

[0027] The top end of the pole tooth on the inner circular surface of the pole shoe Ⅰ 18, the pole shoe Ⅱ 20, the pole shoe Ⅲ 22 and the pole shoe Ⅳ 24 exists a sealing gap with the surface of the rotating shaft 1, and the magnetic liquid is injected into the sealing gap.

[0028] The right magnetic isolation sleeve 15 and the left magnetic isolation sleeve 26 simultaneously press the outer layer 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, the permanent magnet Ⅰ 6 and the inner layer of the sealing assembly.

[0029] Except for the magnetic circuits at the leftmost and rightmost sides, the other magnetic circuits formed by the Halbach array correspond to the magnetic isolation plate regions in the sealing assembly, so that the magnetic circuits can pass through the rotating shaft 1.

[0030] The shell 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 material, 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 material.

[0031] Figure 2 In the embodiment, except for the magnetic circuits at the leftmost and rightmost sides, the single-side strong magnetic field of the Halbach array generates three magnetic circuits, and the components passing through the three magnetic circuits are in the following order: 1: the permanent magnet Ⅵ 11, the permanent magnet Ⅶ 12, the pole shoe Ⅰ 18, the rotating shaft 1, the pole shoe Ⅱ 20, the permanent magnet Ⅴ 10, the permanent magnet Ⅵ 11; 2: the permanent magnet Ⅳ 9, the permanent magnet Ⅲ 8, the pole shoe Ⅲ 22, the rotating shaft 1, the pole shoe Ⅱ 20, the permanent magnet Ⅴ 10, the permanent magnet Ⅳ 9; 3: the permanent magnet Ⅱ 7, the permanent magnet Ⅲ 8, the rotating shaft 1, the pole shoe Ⅳ 24, the permanent magnet Ⅰ 6, the permanent magnet Ⅱ 7.

Claims

1. A high-pressure resistant magnetic liquid sealing device, characterized in that, The device includes: a rotating shaft (1), an elastic retaining ring I (2), a left bearing (3), an end cap (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 shielding sleeve (15), a sealing ring III (16), a right bearing (17), a pole shoe I (18), a magnetic shielding plate I (19), a pole shoe II (20), a magnetic shielding plate II (21), a pole shoe III (22), a magnetic shielding plate III (23), a pole shoe IV (24), a sealing ring IV (25), a left magnetic shielding sleeve (26), and a sealing ring V (27). The connection between the various parts of the device is as follows: the sealing ring I (13) is placed in the annular groove on the outer ring surface of the right magnetic shielding sleeve (15); the sealing ring III (16) is placed in the annular groove on the left end face of the right magnetic shielding sleeve (15); the sealing ring II (14) is placed in the annular groove on the right end face of the outer shell (5); the sealing ring V (27) is placed in the annular groove on the outer ring surface of the left magnetic shielding sleeve (26); and the sealing ring IV (25) is placed in the annular groove on the right end face of the left magnetic shielding sleeve (26). The right bearing (17), right magnetic sleeve (15), 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) are sequentially fitted into the outer shell (5), and the magnetic pole directions of 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) conform to the Heilbeck array; The pole shoe I (18), magnetic shielding plate I (19), pole shoe II (20), magnetic shielding plate II (21), pole shoe III (22), magnetic shielding plate III (23), and pole shoe IV (24) form a sealing assembly to ensure that there is no leakage between the gaps between different materials. The inner hole surface of the pole shoe I (18), pole shoe II (20), pole shoe III (22), and pole shoe IV (24) is machined with pole tooth structure. This sealing assembly is fitted into the inner hole of 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 shielding sleeve (26) and the left bearing (3) are sequentially fitted into the outer shell (5); the end cap (4) is installed on the left end of the outer shell (5) by bolt connection and presses the outer ring of the left bearing (3); The above-mentioned installed structure is fitted onto 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 circular surfaces of permanent magnets VII (12), VI (11), V (10), IV (9), III (8), II (7), and I (6) are tightly fitted with the inner surface of the outer shell (5); the outer circular surface of the sealing assembly is tightly fitted with the inner circular surface of permanent magnets VII (12), VI (11), V (10), IV (9), III (8), II (7), and I (6); The top of the pole teeth on the inner circular surface of the pole shoe I (18), pole shoe II (20), pole shoe III (22), and pole shoe IV (24) have a sealing gap with the surface of the rotating shaft (1), and magnetic liquid is injected into this sealing gap.

2. The high-pressure resistant magnetic liquid sealing device according to claim 1, characterized in that: The right magnetic shielding sleeve (15) and the left magnetic shielding sleeve (26) simultaneously press the outer 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 sealing assembly; Excluding the left and rightmost magnetic circuits, the middle of any other magnetic circuit formed by the Heilbeck array corresponds to the magnetic shielding plate area in the sealing assembly, so that the magnetic circuit can pass through the rotating shaft (1).

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

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