A magnetic liquid sealing device with adjustable magnetic field in the sealing gap

Abstract

This invention discloses a magnetic liquid sealing device with an adjustable magnetic field in the sealing gap. The device includes a shaft, a housing, a left pole shoe ring, a screw, a magnetic guide rod, a right pole shoe ring, an end cap, a sealing ring, a permanent magnet, a sealing ring II, and a magnetic liquid. The housing has a cavity; the sealing ring I is installed in a groove on the outer surface of the left pole shoe ring, forming a left pole shoe ring with a sealing ring; the sealing ring II is installed in a groove on the outer surface of the right pole shoe ring, forming a right pole shoe ring with a sealing ring; the permanent magnet is a C-shaped ring; the magnetic guide rod is located at the C-shaped opening of the permanent magnet; the magnetic guide rod is connected to the screw; the pole shoe rings, permanent magnet, and magnetic guide rod are located within the cavity of the housing, with the inner circumferential surface of the pole shoe rings radially spaced from the outer circumferential surface of the shaft; the permanent magnet and magnetic guide rod are located between the two pole shoe rings; the end cap is connected to the housing by a screw. This invention changes the magnetic flux of two closed magnetic circuits by adjusting the radial distance between the magnetic rod and the magnet, thereby altering the magnetic field strength of the magnetic liquid sealing gap.

Description

Technical Field

[0001] This invention relates to the field of mechanical engineering sealing technology, and in particular to a magnetic liquid sealing device with an adjustable magnetic field for sealing gaps. Background Technology

[0002] Magnetic fluid is a stable colloidal solution formed by uniformly dispersing nano-magnetic particles coated with surfactants in a carrier fluid. Magnetic fluid sealing is a sealing technology that uses a magnetic source to generate a magnetic field at the sealing gap to fix the magnetic fluid at the sealing gap. It has advantages such as zero leakage, long life, high reliability, and low starting torque, and is a new type of high-performance sealing technology.

[0003] However, in practical applications, situations often arise where the seal remains stationary for extended periods. During this time, the magnetic particles in the sealed gap tend to coalesce in areas of high magnetic field strength, creating a tipping effect. This results in a high concentration of magnetic fluid at the tip of the pole teeth while the concentration decreases in other areas, affecting the pressure resistance of the magnetic fluid seal and potentially causing it to fail. Furthermore, the magnetic fluid is prone to solidification at low temperatures, leading to an increased starting torque or even preventing the seal from starting altogether. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] To address this, embodiments of the present invention propose a magnetic liquid sealing device with an adjustable magnetic field in the sealing gap. The device incorporates a movable magnetic rod between the two pole shoes to adjust the magnetic field strength at the sealing gap, thereby causing the magnetic particles in the magnetic liquid to move with changes in the magnetic field strength. This structure effectively solves the problems of uneven distribution of magnetic particles when the magnetic liquid is stationary and the large starting torque of sealing magnetic liquids at low temperatures.

[0006] An embodiment of the present invention provides a magnetic liquid sealing device with adjustable magnetic field for sealing gap, comprising: shaft 1; housing 2; left pole shoe ring 3; screw 4; magnetic rod 5; right pole shoe ring 6; end cap 7; sealing ring I 8; permanent magnet 9; sealing ring II 10; and magnetic liquid 11.

[0007] The present invention discloses the connection between the various parts of a magnetic liquid sealing device with adjustable magnetic field for sealing gaps: the housing has a cavity; sealing ring I is installed in a groove on the outer circumference of the left pole shoe ring, forming a left pole shoe ring with a sealing ring; sealing ring II is installed in a groove on the outer circumference of the right pole shoe ring, forming a right pole shoe ring with a sealing ring; the permanent magnet is a C-shaped ring; the magnetic guide rod is located at the C-shaped opening of the permanent magnet; the magnetic guide rod is connected to a screw; the pole shoe ring, permanent magnet, and magnetic guide rod are located within the cavity of the housing, with the inner circumferential surface of the pole shoe ring and the outer circumferential surface of the shaft radially spaced apart; the permanent magnet and the magnetic guide rod are located between the two pole shoe rings; the end cap is connected to the housing by screws.

[0008] This invention discloses a magnetic liquid sealing device with an adjustable magnetic field in the sealing gap. A screw passes through the outer shell and is threadedly connected to a magnetic guide rod. By rotating the screw, the magnetic guide rod can be moved radially, changing the radial distance between the magnetic guide rod and the permanent magnet, thereby changing the magnetic induction intensity of the pole shoes and achieving adjustable magnetic field strength in the sealing gap. This method can solve the problem of magnetic liquid seal failure caused by magnetic liquid condensing at the tips of the pole teeth with strong magnetic field strength due to prolonged static storage. It also solves the problem of increased starting torque or even failure to start the magnetic liquid seal due to solidification of the magnetic liquid at low temperatures.

[0009] In some embodiments, there is one magnetic rod.

[0010] In some embodiments, a gap of 0.05mm to 0.1mm is left between the magnetic guide rod and the permanent magnet in the circumferential direction, so that the magnetic guide rod can freely pass through the "C"-shaped opening of the permanent magnet.

[0011] In some embodiments, the gap between the outer circular surface of the shaft and the inner circular surface of the pole shoe ring is 0.05 mm to 3 mm. Attached Figure Description

[0012] Figure 1 This is a cross-sectional view of a magnetic liquid sealing device with an adjustable magnetic field in the sealing gap, according to an embodiment of the present invention.

[0013] Figure 2 yes Figure 1 A cross-sectional view along line AA in the middle.

[0014] Figure 3 yes Figure 2 Another scenario.

[0015] Reference numerals: Shaft 1; Housing 2; Left pole shoe ring 3; Screw 4; Magnetic rod 5; Right pole shoe ring 6; End cap 7; Sealing ring I 8; Permanent magnet 9; Sealing ring II 10; Magnetic fluid 11. Detailed Implementation

[0016] The present invention will be further described with reference to the accompanying drawings as specific embodiments:

[0017] An embodiment of the present invention provides a magnetic liquid sealing device with an adjustable magnetic field for the sealing gap, such as... Figure 1 The device includes: shaft 1; housing 2; left pole shoe ring 3; screw 4; magnetic rod 5; right pole shoe ring 6; end cap 7; sealing ring I 8; permanent magnet 9; sealing ring II 10; and magnetic fluid 11.

[0018] The present invention discloses the connection between the various parts of a magnetic liquid sealing device with adjustable magnetic field for sealing gaps: the housing has a cavity; sealing ring I is installed in a groove on the outer circumference of the left pole shoe ring, forming a left pole shoe ring with a sealing ring; sealing ring II is installed in a groove on the outer circumference of the right pole shoe ring, forming a right pole shoe ring with a sealing ring; the permanent magnet is a C-shaped ring; the magnetic guide rod is located at the C-shaped opening of the permanent magnet; the magnetic guide rod is connected to a screw; the pole shoe ring, permanent magnet, and magnetic guide rod are located within the cavity of the housing, with the inner circumferential surface of the pole shoe ring and the outer circumferential surface of the shaft radially spaced apart; the permanent magnet and the magnetic guide rod are located between the two pole shoe rings; the end cap is connected to the housing by screws.

[0019] This invention discloses a magnetic liquid sealing device with an adjustable magnetic field in the sealing gap. A screw passes through the outer shell and is threadedly connected to a magnetic guide rod. By rotating the screw, the magnetic guide rod can be moved radially, changing the radial distance between the magnetic guide rod and the permanent magnet, thereby changing the magnetic induction intensity of the pole shoes and achieving adjustable magnetic field strength in the sealing gap. This method can solve the problem of magnetic liquid seal failure caused by magnetic liquid condensing at the tips of the pole teeth with strong magnetic field strength due to prolonged static storage. It also solves the problem of increased starting torque or even failure to start the magnetic liquid seal due to solidification of the magnetic liquid at low temperatures.

[0020] The magnetic circuit composition of this invention embodiment is as follows: the magnetic field emitted from the N pole of the "C"-shaped permanent magnet is divided into two parts. One part travels along the left pole shoe, shaft, and right pole shoe back to the S pole of the permanent magnet, forming a first closed magnetic circuit; the other part travels along the magnetic guide rod back to the S pole of the permanent magnet, forming a second closed magnetic circuit. By adjusting the radial distance between the magnetic guide rod and the magnet, the magnetic flux of the two closed magnetic circuits is changed, thereby altering the magnetic field strength of the magnetic fluid sealing gap.

[0021] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0025] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0026] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A magnetic liquid sealing device with an adjustable magnetic field for the sealing gap, characterized in that, The sealing device includes: a shaft, a housing, a left pole shoe ring, a screw, a magnetic rod, a right pole shoe ring, an end cap, a sealing ring I, a permanent magnet, a sealing ring II, and a magnetic fluid; The connection between the various parts of the aforementioned magnetic liquid sealing device with adjustable magnetic field for sealing gaps is as follows: The housing has a cavity; the sealing ring I is installed in the groove on the outer surface of the left pole shoe ring, forming a left pole shoe ring with a sealing ring; the sealing ring II is installed in the groove on the outer surface of the right pole shoe ring, forming a right pole shoe ring with a sealing ring; the permanent magnet is a "C"-shaped ring; the magnetic guide rod is located at the "C"-shaped opening of the permanent magnet and is parallel to the plane of the "C"-shaped opening; the magnetic guide rod is connected to a screw; the left and right pole shoe rings, the permanent magnet and the magnetic guide rod are located within the cavity of the housing, and the left pole shoe ring and... The inner circumferential surface of the right pole shoe ring is radially spaced from the outer circumferential surface of the shaft; the permanent magnet and the magnetic rod are located between the two pole shoe rings; the screw passes through the housing and is threadedly connected to the magnetic rod; the magnetic field emitted from the N pole of the "C"-shaped permanent magnet is divided into two parts, one part returns to the S pole of the permanent magnet along the left pole shoe ring, the shaft, and the right pole shoe ring to form the first closed magnetic circuit, and the other part returns to the S pole of the permanent magnet along the magnetic rod to form the second closed magnetic circuit; rotating the screw adjusts the radial distance between the magnetic rod and the permanent magnet, changing the magnetic flux of these two closed magnetic circuits, thereby changing the magnetic field strength of the magnetic liquid sealing gap.

2. The magnetic liquid sealing device with adjustable magnetic field for sealing gap according to claim 1, characterized in that: There is one magnetic rod.

3. The magnetic liquid sealing device with adjustable magnetic field for sealing gap according to claim 1, characterized in that: A circumferential gap of 0.05mm to 0.1mm is left between the two parallel planes at the "C"-shaped opening of the permanent magnet and the magnetic rod, so that the magnetic rod can freely pass through the "C"-shaped opening of the permanent magnet.

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