Magnetic liquid seal

Abstract

The application discloses a magnetic liquid sealing device, which comprises a shaft, a shell, a left pole shoe ring, a permanent magnet, a right pole shoe ring, an end cover, a sealing ring I, a sealing ring II, a magnetic conductive ring, a magnetic isolation sealing ring and a magnetic liquid. The shell has a cavity. The outer circular surface of the magnetic conductive ring is provided with a plurality of annular grooves which are arranged at intervals in the axial direction. The magnetic isolation sealing ring is installed in the grooves to form a magnetic conductive ring with a magnetic isolation sealing ring. The outer circular surface of the magnetic conductive ring is installed in a gapless manner with the inner circular surface of the pole shoe. The magnetic liquid is adsorbed on the inner circular surface of the magnetic conductive ring and located directly below two adjacent magnetic isolation sealing rings to form a spaced magnetic liquid ring. The end cover is connected with the shell through screws. The magnetic conductive ring and the pole shoe are matched, the magnetic isolation sealing ring separates the magnetic field and is used as a static seal, the pole teeth are not machined on the inner circular surface of the pole shoe, the magnetic field gradient can be generated at the sealing gap, and good sealing performance is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical engineering sealing, in particular to a magnetic liquid sealing device. BACKGROUND

[0002] The magnetic liquid is a stable colloidal solution formed by uniformly dispersing nano-magnetic particles coated with surfactant in a base carrier liquid. The magnetic liquid sealing is a new type of high-performance sealing technology with the advantages of zero leakage, long service life, high reliability, small starting torque, etc., which utilizes a magnetic source to generate a magnetic field and realizes sealing capacity through the magnetic field gradient generated by the pole teeth at the sealing gap.

[0003] The traditional magnetic liquid sealing forms the magnetic field gradient at the sealing gap by machining the pole teeth on the inner circular surface of the pole shoe. However, machining the pole teeth on the inner circular surface of the pole shoe requires very high precision and is very difficult to process. Moreover, the pole teeth are easily damaged during the machining and assembly process, and at this time the whole pole shoe will become waste material, which is time-consuming, laborious and wasteful of materials, and the loss is large. In addition, the traditional magnetic liquid sealing with pole teeth is prone to failure at high speed due to the action of centrifugal force, which causes the magnetic liquid to flow into the tooth groove of the pole teeth. Therefore, the present application proposes a new type of magnetic liquid sealing device. SUMMARY

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

[0005] To this end, an embodiment of the present application proposes a magnetic liquid sealing device which breaks through the toothed structure of the traditional magnetic liquid sealing and designs a toothless magnetic liquid sealing. The magnetic liquid sealing device cooperates with the pole shoe through the magnetic conducting ring, separates the magnetic field through the magnetic isolation sealing ring, and serves as a static seal. The magnetic liquid sealing device can generate a magnetic field gradient at the sealing gap without machining the pole teeth on the inner circular surface of the pole shoe, and realizes good sealing performance.

[0006] The magnetic liquid sealing device of an embodiment of the present application comprises: a shaft 1; a housing 2; a left pole shoe ring 3; a permanent magnet 4; a right pole shoe ring 5; an end cover 6; a sealing ring I 7; a sealing ring II 8; a magnetic conducting ring 9; a magnetic isolation sealing ring 10; and a magnetic liquid 11.

[0007] The connection between the parts of the magnetic liquid sealing device of the embodiment of the present application is as follows: the shell has a chamber; the sealing ring I is installed in the groove on the outer circumferential surface of the left pole shoe ring to form a left pole shoe ring with a sealing ring; the sealing ring II is installed in the groove on the outer circumferential surface of the right pole shoe ring to form a right pole shoe ring with a sealing ring; the permanent magnet is arranged in the chamber and located between the two pole shoes; the outer circumferential surface of the magnetic conducting ring is provided with a plurality of annular grooves arranged axially and spaced apart, the magnetic shielding sealing ring is installed in the groove to form a magnetic conducting ring with a magnetic shielding sealing ring; the outer circumferential surface of the magnetic conducting ring is installed in gapless cooperation with the inner circumferential surface of the pole shoe; the magnetic liquid is adsorbed on the inner circumferential surface of the magnetic conducting ring and located below the two adjacent magnetic shielding sealing rings to form a spaced magnetic liquid ring; and the end cover is connected with the shell through screws.

[0008] The magnetic liquid sealing device of the embodiment of the present application is designed to gaplessly cooperate the outer circumferential surface of the magnetic conducting ring with the annular grooves arranged at intervals with the inner circumferential surface of the pole shoe, which can avoid the waste of the whole pole shoe material caused by the damage of the pole teeth processed on the inner circumferential surface of the traditional pole shoe; the magnetic shielding sealing ring is installed in the axial spaced grooves of the magnetic conducting ring, which can not only seal the new leakage channel formed between the outer circumferential surface of the magnetic conducting ring and the outer circumferential surface of the pole shoe, but also can gather the magnetic force lines between the two adjacent magnetic shielding sealing rings to form a magnetic field gradient, so that the sealing can be realized even without processing the pole teeth. The difficulty of processing the grooves on the outer circumferential surface of the magnetic conducting ring is far less than that of processing the pole teeth on the inner circumferential surface of the pole shoe, and there is no problem of damage of the sealing member pole teeth and the magnetic liquid flowing into the pole tooth groove due to the centrifugal force under high speed.

[0009] In some embodiments, the outer circumferential surface of the magnetic conducting ring is spaced apart to form a plurality of outer circumferential surface teeth with annular grooves, and 1-2 special teeth in the outer circumferential surface teeth have a height difference of 1-3 mm from the heights of the other teeth for fixed cooperation with the inner circumferential surface of the pole shoe.

[0010] In some embodiments, the radial distance between the inner circumferential surface of the magnetic conducting ring and the outer circumferential surface of the shaft is 0.1-0.3 mm.

[0011] In some embodiments, the pole shoe is a split pole shoe, and 1-2 grooves are processed circumferentially on the inner circumferential surface of the pole shoe, and the number and position of the grooves are consistent with the special teeth on the outer circumferential surface of the magnetic conducting ring to fix the magnetic conducting ring.

[0012] In some embodiments, the magnetic shielding sealing ring is not magnetic and has good static sealing effect, the number of the magnetic shielding sealing rings is consistent with the number of the grooves on the outer circumferential surface of the magnetic conducting ring, and the size of the magnetic shielding sealing ring is just suitable for the size of the groove on the outer circumferential surface of the magnetic conducting ring. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a sectional view of the magnetic liquid sealing device of the embodiment of the present application.

[0014] Figure 2 is Figure 1 is a partial enlarged view of A in the figure.

[0015] Figure 3 is a sectional view of the magnetic ring.

[0016] Figure 4 is a magnetic force line distribution diagram of a magnetic liquid sealing device according to an embodiment of the present application.

[0017] Figure 5 is Figure 4 is a partial enlarged view of B in the figure.

[0018] Reference signs: shaft 1; housing 2; left pole shoe ring 3; permanent magnet 4; right pole shoe ring 5; end cover 6; sealing ring I 7; sealing ring II 8; magnetic conducting ring 9; magnetic isolation sealing ring 10; magnetic liquid 11; magnetic force line 12. DETAILED DESCRIPTION

[0019] The present application is further described in the detailed description of the drawings, wherein the embodiments described in the drawings are exemplary and are used to explain the present application, and cannot be understood as a limitation of the present application:

[0020] The embodiment of the present application provides a magnetic liquid sealing device, which breaks through the toothed structure of the traditional magnetic liquid sealing, and designs a toothless magnetic liquid sealing. The magnetic liquid sealing device is not required to process pole teeth on the inner circular surface of the pole shoe, and can generate a magnetic field gradient at a sealing gap, so that good sealing performance is achieved.

[0021] The magnetic liquid sealing device according to the embodiment of the present application comprises a shaft 1, a housing 2, a left pole shoe ring 3, a permanent magnet 4, a right pole shoe ring 5, an end cover 6, a sealing ring I 7, a sealing ring II 8, a magnetic conducting ring 9, a magnetic isolation sealing ring 10 and a magnetic liquid 11.

[0022] The connection between the parts of the magnetic liquid sealing device according to the embodiment of the present application is as follows: the housing has a cavity; the sealing ring I is installed in the groove on the outer circular surface of the left pole shoe ring, and forms a left pole shoe ring with a sealing ring; the sealing ring II is installed in the groove on the outer circular surface of the right pole shoe ring, and forms a right pole shoe ring with a sealing ring; the permanent magnet is arranged in the cavity and located between the two pole shoes; the outer circular surface of the magnetic conducting ring is provided with a plurality of annular grooves arranged axially and spaced apart, the magnetic isolation sealing ring is installed in the groove to form a magnetic conducting ring with a magnetic isolation sealing ring; the outer circular surface of the magnetic conducting ring is installed in a gapless manner with the inner circular surface of the pole shoe; the magnetic liquid is adsorbed on the inner circular surface of the magnetic conducting ring, located below two adjacent magnetic isolation sealing rings, and forms a spaced magnetic liquid ring; and the end cover is connected with the housing through screws.

[0023] The magnetic liquid sealing device of the embodiment of the present application is designed with the magnetic conducting ring with the grooves arranged on the outer circumferential surface and the inner circumferential surface of the pole shoe without gap, which can avoid the waste of the whole pole shoe material caused by the damage of the pole teeth on the inner circumferential surface of the traditional pole shoe. The magnetic isolation sealing ring is arranged in the axial grooves of the magnetic conducting ring, which can not only seal the new leakage channel formed between the outer circumferential surface of the magnetic conducting ring and the outer circumferential surface of the pole shoe, but also can gather the magnetic lines between the adjacent two magnetic isolation sealing rings to form a magnetic field gradient. At this time, the sealing can be realized even without processing the pole teeth. The difficulty of processing the grooves on the outer circumferential surface of the magnetic conducting ring is far less than that of processing the pole teeth on the inner circumferential surface of the pole shoe, and there is no problem of damage of the sealing teeth and the failure of the sealing caused by the magnetic liquid flowing into the tooth groove due to the centrifugal force under the high speed.

[0024] In some embodiments, as shown in FIG. 1, the outer circumferential surface of the magnetic conducting ring is arranged with the annular grooves to form a plurality of outer circumferential teeth arranged at intervals, and the outer diameter of the special teeth at both ends of the magnetic conducting ring is 2-6 mm wider than that of the remaining teeth. Figure 3 In some embodiments, as shown in FIG. 1, the outer circumferential surface of the magnetic conducting ring is arranged with the annular grooves to form a plurality of outer circumferential teeth arranged at intervals, and the outer diameter of the special teeth at both ends of the magnetic conducting ring is 2-6 mm wider than that of the remaining teeth.

[0025] In some embodiments, the radial distance between the inner circumferential surface of the magnetic conducting ring and the outer circumferential surface of the shaft is 0.1-0.3 mm.

[0026] In some embodiments, the pole shoe is a split pole shoe, and the inner circumferential surface of the pole shoe is circumferentially arranged with 1-2 grooves, the number, position and size of which are consistent with those of the special teeth on the outer circumferential surface of the magnetic conducting ring, so as to fix the magnetic conducting ring.

[0027] In some embodiments, the magnetic isolation sealing ring is non-magnetic and has good static sealing effect, the number of the magnetic isolation sealing ring is consistent with that of the grooves on the outer circumferential surface of the magnetic conducting ring, and the size of the magnetic isolation sealing ring is just suitable for the size of the grooves on the outer circumferential surface of the magnetic conducting ring.

[0028] The magnetic circuit of the embodiment of the present application is composed of the magnetic field emitted from the N pole of the permanent magnet, the magnetic field passing through the left pole shoe, the magnetic lines concentrating between the adjacent two magnetic isolation sealing rings due to the magnetic isolation effect of the magnetic isolation sealing ring, the magnetic field gradient formed at the sealing gap, the magnetic liquid being adsorbed to form a seal, the magnetic lines passing through the shaft, the right magnetic conducting ring and the right pole shoe in turn, and then returning to the S pole of the permanent magnet to form a magnetic circuit.

[0029] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements indicated thereby must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0030] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated thereby. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0031] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or it can only mean that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or it can only mean that the horizontal height of the first feature is less than that of the second feature.

[0033] In this disclosure, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic is included in at least one embodiment or example of the present disclosure. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily referred to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Furthermore, the terminology "comprising" is used in the disclosure as comprising but not limited to, that is, it is open-ended and does not exclude the presence of additional features, structures, materials, or characteristics.

[0034] Although the embodiments of the present disclosure have been shown and described above, it is understood that the above-described embodiments are exemplary, and are not to be interpreted as limiting the present disclosure, and the ordinary skilled in the art can make changes, modifications, replacements, and variations to the above-described embodiments within the scope of the present disclosure.

Claims

1. A magnetic liquid sealing device, characterized in that, The sealing device includes: a shaft, a housing, a left pole shoe ring, a permanent magnet, a right pole shoe ring, an end cap, a sealing ring I, a sealing ring II, a magnetic conductive ring, a magnetic shielding sealing ring, and a magnetic fluid; The connection between the various parts of the above-mentioned magnetic liquid sealing device is as follows: the housing has a cavity; the sealing ring I 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 sealing ring II 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 permanent magnet is disposed in the cavity and located between the left and right pole shoe rings; the outer surface of the magnetic guide ring has multiple annular grooves spaced axially, and the magnetic isolation sealing ring is installed in the grooves to form a magnetic guide ring with a magnetic isolation sealing ring; the outer surface of the magnetic guide ring is fitted with the inner surface of the corresponding pole shoe ring without clearance; the magnetic liquid is adsorbed in the cavity. On the inner circular surface of the magnetic ring, below the two adjacent magnetic isolation sealing rings, a spaced magnetic liquid ring is formed; the end cap is connected to the housing by screws; the left and right pole shoe rings are segmented pole shoes; the magnetic isolation sealing rings are non-magnetic and have good static sealing effect; the number of magnetic isolation sealing rings is consistent with the number of grooves on the outer circular surface of the magnetic ring, and the size of the magnetic isolation sealing rings is just adapted to the size of the grooves on the outer circular surface of the sealing magnetic ring; the magnetic lines of force emanating from the N pole of the permanent magnet pass through the corresponding pole shoe rings and then concentrate between two adjacent magnetic isolation sealing rings, forming a magnetic field gradient at the sealing gap, attracting magnetic liquid to form a seal.

2. The magnetic liquid sealing device according to claim 1, characterized in that: The outer circular surface of the magnetic ring is machined with annular grooves to form multiple spaced outer circular surface teeth, which facilitates fixed engagement with the inner circular surface of the corresponding pole shoe ring. Among the outer circular surface teeth, the height of 1 to 2 special teeth is 1 mm to 3 mm different from that of the other teeth.

3. The magnetic liquid sealing device according to claim 1, characterized in that: The radial distance between the inner circular surface of the magnetic ring and the outer circular surface of the shaft is 0.1mm to 0.3mm.

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