A magnetic liquid sealing device resistant to axial and radial vibrations

Abstract

The sealing device resistant to axial or radial vibration of the present invention belongs to the field of mechanical engineering sealing technology. The device comprises: a main shaft, a sealing ring I, a magnetic sleeve, a left spacer, a housing, a spring I, a sealing ring II, a left pole shoe, a cylindrical magnet, a right pole shoe, a sealing ring III, a right spacer, a spring II, and an end cover. There is a part of direct contact between the left and right pole shoes and the magnetic sleeve to form an end face seal, and springs are installed in the left and right spacers, so that the left and right pole shoes can be continuously pressed in an axial vibration environment so that the end face seal is not easy to produce a gap and fail. The cross-section of the middle part of the magnetic sleeve is rectangular, and the left and right pole shoes, the permanent magnet and the main shaft and the magnetic sleeve can move relative to each other in the radial direction. When the main shaft produces radial vibration, it can ensure that the gap size between the pole teeth on the left and right pole shoes and the magnetic sleeve does not change, and the area where the left and right pole shoes and the magnetic sleeve form the end face seal is coated with wear-resistant and high-temperature resistant materials to ensure the sealing performance of the device.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical engineering seals and is suitable for seals with axial or radial vibrations. Background Art

[0002] Magnetic liquid seals have the advantages of zero leakage, long life and low friction, and are widely used in the sealing field. However, in practical applications, ordinary magnetic liquid sealing devices have great limitations. Under continuous axial or radial vibration environments, gaps are easily generated, leading to failure. Therefore, a magnetic liquid sealing device that is resistant to axial and radial vibrations is proposed. Summary of the invention

[0003] The object of the present invention is to provide a magnetic liquid sealing device which has a simple structure, high reliability and is resistant to axial and radial vibrations.

[0004] A magnetic liquid sealing device resistant to axial and radial vibrations, characterized in that the sealing device comprises: a main shaft (1), a sealing ring I (2), a magnetic sleeve (3), a left spacer (4), a housing (5), a spring I (6), a sealing ring II (7), a left pole shoe (8), a cylindrical permanent magnet (9), a right pole shoe (10), a sealing ring III (11), a right spacer (12), a spring II (13), and an end cover (14).

[0005] The connection between the various parts of the device is formed as follows: the sealing ring I is installed in the groove of the inner circular surface of the magnetic sleeve to form a magnetic sleeve with a sealing ring; the sealing ring II is installed in the groove of the outer circular surface of the left pole shoe to form a left pole shoe with a sealing ring; the sealing ring III is installed in the groove of the outer circular surface of the right pole shoe to form a right pole shoe with a sealing ring.

[0006] The left spacer, spring, left pole shoe with sealing ring, magnetic sleeve with sealing ring, cylindrical permanent magnet, right pole shoe with sealing ring, spring and right spacer are sequentially installed into the box body. The left boss presses the left spacer and then compresses the spring so that the left pole shoe and magnetic sleeve can be in close contact to form an end face seal. The right side is screwed into the box body through the end cover thread to press the right spacer and then compress the spring so that the right pole shoe and magnetic sleeve can be in close contact to form an end face seal. Sufficient magnetic liquid is injected between the magnetic sleeve and the pole teeth on the left and right pole shoes to form a magnetic liquid seal.

[0007] Compared with the common magnetic liquid sealing device, the present invention has the following beneficial effects: 1. There is a part of direct contact between the left and right pole shoes and the magnetic sleeve to form the end face seal, and springs are installed in the left and right spacer sleeves, so that the left and right pole shoes can be continuously pressed in the axial vibration environment so that the end face seal is not easy to produce gaps and fail. 2. The cross-section of the middle part of the magnetic sleeve is rectangular, and the left and right pole shoes, cylindrical permanent magnets and the main shaft and the magnetic sleeve can move relative to each other in the radial direction. When the main shaft produces radial vibration, it can ensure that the gap size between the pole teeth on the left and right pole shoes and the magnetic sleeve does not change, and the area where the left and right pole shoes and the magnetic sleeve form the end face seal is coated with wear-resistant and high-temperature resistant materials to ensure the sealing performance of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 Schematic diagram of the magnetic liquid sealing device of the present invention

[0009] Figure 1 In the figure: main shaft (1), sealing ring I (2), magnetic sleeve (3), left spacer (4), housing (5), spring I (6), sealing ring II (7), left pole shoe (8), cylindrical permanent magnet (9), right pole shoe (10), sealing ring III (11), right spacer (12), spring II (13), end cover (14). DETAILED DESCRIPTION

[0010] The present invention will be further described with reference to the accompanying drawings as specific embodiments:

[0011] A magnetic liquid sealing device resistant to axial and radial vibrations, characterized in that the sealing device comprises: a main shaft (1), a sealing ring I (2), a magnetic sleeve (3), a left spacer (4), a housing (5), a spring I (6), a sealing ring II (7), a left pole shoe (8), a cylindrical permanent magnet (9), a right pole shoe (10), a sealing ring III (11), a right spacer (12), a spring II (13), and an end cover (14).

[0012] The connection between the various parts of the device is formed as follows: the sealing ring I is installed in the groove of the inner circular surface of the magnetic sleeve to form a magnetic sleeve with a sealing ring; the sealing ring II is installed in the groove of the outer circular surface of the left pole shoe to form a left pole shoe with a sealing ring; the sealing ring III is installed in the groove of the outer circular surface of the right pole shoe to form a right pole shoe with a sealing ring.

[0013] The left spacer, spring, left pole shoe with sealing ring, magnetic sleeve with sealing ring, cylindrical permanent magnet, right pole shoe with sealing ring, spring and right spacer are sequentially installed into the box body. The left boss presses the left spacer and then compresses the spring so that the left pole shoe and magnetic sleeve can be in close contact to form an end face seal. The right side is screwed into the box body through the end cover thread to press the right spacer and then compress the spring so that the right pole shoe and magnetic sleeve can be in close contact to form an end face seal. Sufficient magnetic liquid is injected between the magnetic sleeve and the pole teeth on the left and right pole shoes to form a magnetic liquid seal.

[0014] The composition of the magnetic circuit is described below: the magnetic field emitted from the N pole of the cylindrical permanent magnet passes through the left pole shoe, the magnetic sleeve, and the right pole shoe to reach the S pole of the cylindrical permanent magnet to form a closed magnetic circuit.

[0015] The cylindrical permanent magnet is made of a material with good magnetic properties, such as neodymium iron boron;

[0016] The housing, end cap and screws of the device are all made of stainless steel 304;

[0017] The left pole shoe ring, magnetic guide sleeve and right pole shoe ring are all made of 2Cr13;

[0018] The left spacer and the right spacer are both made of hard aluminum;

[0019] The end face sealing area formed by the left and right pole shoes and the magnetic conductive sleeve is coated with wear-resistant and high-temperature resistant material;

[0020] The type of the magnetic liquid is selected according to the use environment and the sealing medium, and magnetic liquids with different base carrier liquids are selected.

Claims

1. A magnetic liquid sealing device resistant to axial and radial vibrations, characterized in that: The sealing device comprises: a main shaft (1), a sealing ring I (2), a magnetic sleeve (3), a left spacer (4), a housing (5), a spring I (6), a sealing ring II (7), a left pole shoe (8), a cylindrical permanent magnet (9), a right pole shoe (10), a sealing ring III (11), a right spacer (12), a spring II (13), and an end cover (14); The connection between the various parts of the device is formed: the sealing ring I is installed in the groove of the inner circumference of the magnetic sleeve to form a magnetic sleeve with a sealing ring; the sealing ring II is installed in the groove of the outer circumference of the left pole shoe to form a left pole shoe with a sealing ring; the sealing ring III is installed in the groove of the outer circumference of the right pole shoe to form a right pole shoe with a sealing ring; The left spacer, spring I, the left pole shoe with a sealing ring, the magnetic sleeve with a sealing ring, the cylindrical permanent magnet, the right pole shoe with a sealing ring, the spring II, and the right spacer are sequentially installed in the box body. The left boss presses the left spacer and then compresses the spring I so that the left pole shoe and the magnetic sleeve can be in close contact to form an end face seal. The right side is screwed into the box body through the end cover thread to press the right spacer and then compress the spring II so that the right pole shoe and the magnetic sleeve can be in close contact to form an end face seal. A sufficient amount of magnetic liquid is injected between the magnetic sleeve and the pole teeth on the left and right pole shoes to form a magnetic liquid seal. The left and right pole shoes have bosses higher than the pole teeth on one side near the inner circular surface, which are in direct contact with the magnetic sleeve. The magnetic sleeve, the left and right pole shoes and the cylindrical permanent magnet are rigid in the axial direction. When axial vibration occurs, the force is transmitted to the left and right pole shoes through the magnetic sleeve, and then to the spring. The spring expands and contracts to compensate for the axial vibration of the main shaft. The sealing rings on the left and right pole shoes can ensure that the device still has sealing performance when the spring moves. The cross-section of the middle part of the magnetic sleeve is rectangular. The left and right pole shoes, the cylindrical permanent magnet, the main shaft and the magnetic sleeve can move relative to each other in the radial direction. When the main shaft produces radial vibration, the gap between the pole teeth on the left and right pole shoes and the magnetic sleeve will not change, thereby ensuring the sealing performance of the device.

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