Magnetic sealing device for stirring shaft end

Abstract

The invention discloses a stirring shaft end magnetic sealing device, and relates to the technical field of stirring equipment, the stirring shaft end magnetic sealing device comprises a stirring shaft body, the outer top of the stirring shaft body is sleeved with a driving ring, the stirring shaft body is sleeved with a shaft sleeve, the shaft sleeve is sleeved with a sealing seat, and a magnetic sealing assembly is arranged between the shaft sleeve and the sealing seat. By arranging the shaft sleeve sealing ring, a gap between the stirring shaft body and the shaft sleeve can be effectively reduced, and under the cooperation of the magnetic sealing assembly, the filled magnetic fluid is close to the sealing rings under the action of magnetic force through the magnetic ring and the sealing rings at the two ends of the magnetic ring, so that a tight sealing state is formed; and meanwhile, the magnetic fluid can be adaptively adjusted according to pressure changes, and the sealing effect of the magnetic sealing assembly is further enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of stirring equipment, and in particular to a magnetic sealing device at the end of a stirring shaft. Background Art

[0002] The agitator shaft is a key component in industrial mixing equipment. It is mainly used to transmit external power to the agitator to achieve process requirements such as material mixing, dispersion, emulsification or heat transfer. During operation, if the end of the agitator shaft is not effectively sealed, the internal liquid, gas or other media will easily leak, causing material loss and unstable equipment operation. Therefore, the sealing of the agitator shaft end has become a key link in the design of industrial mixing equipment. Its core role is to prevent medium leakage and protect the stability of equipment operation.

[0003] Traditional mechanical seals form a sealing surface through the friction pair between the static ring and the dynamic ring to prevent medium leakage. However, when dealing with media containing particles, solid impurities or high viscosity, impurities may enter the gap of the friction pair, damage the sealing surface, and reduce the sealing performance. In addition, under high pressure, high speed or complex media (such as corrosive media) conditions, the sealing surface may produce slight deformation, resulting in an increase in the gap and causing medium leakage. In general, the sealing effect and service life of traditional sealing technology under high pressure, high temperature, vacuum or corrosive conditions will be greatly limited.

[0004] Currently, no effective solution has been proposed for the problems in the related technologies. Summary of the invention

[0005] In view of the problems in the related art, the present invention proposes a magnetic sealing device for the end of an agitator shaft to overcome the above-mentioned technical problems existing in the existing related art.

[0006] To this end, the specific technical solution adopted by the present invention is as follows:

[0007] A magnetic sealing device for the end of a stirring shaft comprises a stirring shaft body, the outer top of the stirring shaft body is sleeved with a driving ring, characterized in that the outer sleeve of the stirring shaft body is sleeved with a shaft sleeve, the outer sleeve of the shaft sleeve is sleeved with a sealing seat, a first bearing and a second bearing are arranged in parallel between the shaft sleeve and the sealing seat, a magnetic sealing assembly is arranged between the shaft sleeve and the sealing seat, and a sealing gland is arranged on the sealing seat;

[0008] The magnetic sealing assembly includes a pair of sealing rings arranged between the shaft sleeve and the sealing seat, a magnetic ring is arranged between the pair of sealing rings, an external thread is arranged in the middle of the outer circumference of the shaft sleeve, a matching connecting thread is arranged on the inner ring of the sealing ring, and a magnetic fluid is filled in the gap between the external thread and the connecting thread.

[0009] As a preferred solution, the magnetic ring is formed by a circle of magnetic columns.

[0010] As a preferred solution, a bearing retaining ring is provided beside the first bearing and beside the second bearing at one end close to the corresponding sealing ring.

[0011] As a preferred solution, a plurality of shaft sleeve sealing rings are sleeved on the outer periphery of the stirring shaft body and the portion located inside the shaft sleeve.

[0012] As a preferred solution, the second bearing is far away from the driving ring, and a retaining spring is arranged on the stirring shaft body at the lower part of the second bearing; and a bearing cover for pressing the outer ring of the second bearing is arranged in the sealing seat.

[0013] As a preferred solution, a polytetrafluoroethylene lip seal is arranged at the lower part of the bearing cover in the sealing seat.

[0014] As a preferred solution, a sealing ring is provided on the outer bottom of the sealing seat.

[0015] The beneficial effects of the present invention are:

[0016] 1. The present invention, under the cooperation of the shaft sleeve sealing ring, shaft sleeve, sealing seat and magnetic sealing assembly, can guide the magnetic fluid close to the sealing ring to form a tight sealing state through the magnetic attraction between the magnetic materials, thereby avoiding the leakage problem caused by contact wear of traditional mechanical seals. The structural design between the sealing seat and the shaft sleeve can withstand high pressure, and the magnetic seal will not fail due to increased pressure, thus solving the defect of shortened service life of traditional mechanical seals due to friction and wear.

[0017] 2. The present invention can effectively reduce the gap between the stirring shaft body and the shaft sleeve by setting a shaft sleeve sealing ring, and with the cooperation of the magnetic sealing assembly, through the magnetic ring and the sealing rings at both ends, the filled magnetic fluid is close to the sealing ring under the action of magnetic force, forming a tight sealing state, and at the same time, the magnetic fluid can adapt and adjust according to the pressure change, further enhancing the sealing effect of the magnetic sealing assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 is a cross-sectional view of a magnetic sealing device at an end of a stirring shaft according to an embodiment of the present invention;

[0020] Figure 2is a top view of a magnetic sealing device at an end of a stirring shaft according to an embodiment of the present invention.

[0021] In the figure:

[0022] 1. Stirring shaft body; 2. Driving ring; 3. Bushing; 4. Sealing seat; 401. Sealing ring; 5. Magnetic sealing assembly; 501. Magnetic ring; 5011. Magnetic column; 502. Sealing ring; 503. First bearing; 504. Second bearing; 505. Bearing retaining ring; 506. Circlip; 507. PTFE lip seal; 6. Bushing sealing ring. DETAILED DESCRIPTION

[0023] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, ordinary technicians in the field should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0024] According to an embodiment of the present invention, a magnetic sealing device for an end of an agitator shaft is provided.

[0025] The present invention is further described with reference to the accompanying drawings and specific embodiments. Figure 1-Figure 2 As shown, the magnetic sealing device at the end of the stirring shaft according to an embodiment of the present invention includes a stirring shaft body 1, the outer top of the stirring shaft body 1 is sleeved with a driving ring 2, the outer sleeve of the stirring shaft body 1 is sleeved with a sleeve 3 (the sleeve 3 is sleeved on the stirring shaft body 1 that requires end sealing, the stirring shaft body 1 can pass through the sleeve 3 according to the setting requirements, and the sleeve 3 can also be closed at one end), and the outer sleeve 3 is sleeved with a sealing seat 4, and a magnetic sealing assembly 5 is arranged between the sleeve 3 and the sealing seat 4.

[0026] With the aid of the above scheme, the present invention, under the cooperation of the shaft sleeve sealing ring 6, the shaft sleeve 3, the sealing seat 4 and the magnetic sealing assembly 5, can guide the magnetic fluid to approach the sealing ring 502 through the magnetic attraction between the magnetic materials to form a tight sealing state, thereby avoiding the leakage problem caused by contact wear of traditional mechanical seals. The structural design between the sealing seat 4 and the shaft sleeve 3 can withstand high pressure, and the magnetic seal will not fail due to increased pressure, thereby solving the defect of shortened service life of traditional mechanical seals due to friction and wear.

[0027] In one embodiment, for the magnetic sealing assembly 5, the magnetic sealing assembly 5 includes a magnetic ring 501 disposed between the shaft sleeve 3 and the sealing seat 4, and sealing rings 502 matching with the shaft sleeve 3 are disposed at both ends of the magnetic ring 501 (a sealing ring 502 is disposed above and below the magnetic ring, and the sealing ring 502 matches with the shaft sleeve 3 through threads, and the two threads are filled with sealing liquid), the magnetic ring 501 is formed by a combination of a plurality of magnetic columns 5011, and the first bearing 503 and the second bearing 504 are disposed at one end of the two groups of sealing rings 502, respectively, and the first bearing 503 and the second bearing 504 are both disposed at one end with a bearing retaining ring 505, so that the magnetic fluid filled is close to the sealing ring 502 under the action of magnetic force through the magnetic ring 501 and the sealing rings 502 at both ends, forming a tight sealing state, and the magnetic fluid can be adapted and adjusted according to the pressure change, further enhancing the sealing effect of the magnetic sealing assembly 5. A sealing gland is disposed on the sealing seat 4.

[0028] Specifically, a plurality of magnetic columns 5011 are arranged and combined to form a magnetic ring 501, so that the magnetic field distribution is more uniform, and the guiding force of the magnetic fluid is enhanced. Under the action of the magnetic force, the magnetic fluid can move closer to the sealing ring 502 more stably to form a strong sealing barrier. In actual applications, the magnetic ring 501 is composed of a plurality of magnetic columns 5011 or the magnetic ring 501 is directly set.

[0029] In one embodiment, for the above-mentioned stirring shaft body 1, a plurality of sleeve sealing rings 6 are provided on the outside of the stirring shaft body 1 and located inside the sleeve 3, and a sealing ring 401 is provided on the outer bottom of the sealing seat 4, thereby effectively reducing the gap between the stirring shaft body 1 and the sleeve 3. The multi-sealing ring structure can still maintain a stable seal under high pressure or high speed conditions, reducing the risk of leakage caused by component offset.

[0030] In one embodiment, the second bearing 504 is away from the driving ring, and a retaining ring 506 is provided on the stirring shaft body 1 at the lower part of the second bearing 504; and a bearing cover is provided in the sealing seat 4 to press the outer ring of the second bearing 504. This can stabilize the connection between the bearing and other sealing components to prevent displacement or loosening during operation.

[0031] In one embodiment, a polytetrafluoroethylene lip seal 507 is provided at the lower part of the bearing cover in the sealing seat 4 to reduce the risk of external impurities entering the sealing area. The polytetrafluoroethylene lip seal 507 fits tightly to the surface of the sleeve to eliminate small gaps. When the stirring shaft body 1 rotates at high speed or the pressure fluctuates, the polytetrafluoroethylene lip seal 507 can also maintain a stable sealing state.

[0032] Specifically, the PTFE lip seal 507 is a seal made of polytetrafluoroethylene material. The PTFE lip seal is tightly attached to the shaft surface through the lip-shaped design to form a dynamic seal. It can maintain a sealed state when the stirring shaft rotates at high speed or the medium pressure fluctuates. The PTFE lip seal 507 can effectively prevent medium leakage and prevent external impurities from entering the sealing cavity.

[0033] In order to facilitate understanding of the above technical solutions of the present invention, the working principle or operation mode of the present invention in the actual process is described in detail below.

[0034] In actual application, the driving ring 2 is first driven to rotate by an external power device, and the driving ring 2 drives the stirring shaft body 1 to rotate. Since a plurality of sleeve sealing rings 6 arranged inside the sleeve 3 form a first layer of sealing barrier, the stirring medium is prevented from leaking out along the gap between the stirring shaft body 1 and the sleeve 3. The sealing ring 401 at the outer bottom of the sealing seat forms a second layer of sealing barrier, thereby preventing the leakage of the medium and protecting the sealing cavity from external pollution. The stirring shaft body 1 is in the studio, and the magnetic ring 501 in the magnetic sealing assembly 5 guides the magnetic fluid to move closer to the sealing ring 502 through magnetic force, fills the small gap, and forms a dynamic contactless seal. One end of the two sets of sealing rings 502 supports the rotating part of the stirring shaft body 1 through the first bearing 503 and the second bearing 504. The retaining spring 506 at the bottom of the second bearing 504 provides structural support for the bottom seal of the sealing assembly. At the same time, the polytetrafluoroethylene lip seal 507 uses its flexible fitting characteristics to further prevent the leakage of the medium from the bottom and block the entry of external pollutants, thereby effectively enhancing the sealing effect of the magnetic sealing device at the end of the stirring shaft.

[0035] In summary, with the aid of the above technical scheme of the present invention, the present invention can, under the cooperation of the shaft sleeve sealing ring 6, the shaft sleeve 3, the sealing seat 4 and the magnetic sealing assembly 5, guide the magnetic fluid to approach the sealing ring 502 through the magnetic attraction between the magnetic materials to form a tight sealing state, thereby avoiding the leakage problem caused by contact wear of the traditional mechanical seal, and the structural design between the sealing seat 4 and the shaft sleeve 3 can withstand high pressure, and the magnetic seal will not fail due to the increase in pressure, thereby solving the defect of the traditional mechanical seal that the service life is shortened due to friction and wear; the present invention can effectively reduce the gap between the stirring shaft body 1 and the shaft sleeve 3 by setting the shaft sleeve sealing ring 6, and under the cooperation of the magnetic sealing assembly 5, through the magnetic ring 501 and the sealing rings 502 at both ends, the filled magnetic fluid is magnetically acted to approach the sealing ring 502 to form a tight sealing state, and the magnetic fluid can be adapted and adjusted according to the pressure change, further enhancing the sealing effect of the magnetic sealing assembly 5.

[0036] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A magnetic sealing device for a stirring shaft end, comprising a stirring shaft body, wherein a driving ring is sleeved on the outer top of the stirring shaft body, characterized in that: The outer sleeve of the stirring shaft body is provided with a shaft sleeve, the outer sleeve of the shaft sleeve is provided with a sealing seat, a first bearing and a second bearing are arranged in parallel between the shaft sleeve and the sealing seat, and a magnetic sealing assembly is arranged between the first bearing and the second bearing between the shaft sleeve and the sealing seat; a sealing gland is provided on the sealing seat; The magnetic sealing assembly includes a pair of sealing rings arranged between the shaft sleeve and the sealing seat, a magnetic ring is arranged between the pair of sealing rings, an external thread is arranged in the middle of the outer circumference of the shaft sleeve, a matching connecting thread is arranged on the inner ring of the sealing ring, and a magnetic fluid is filled in the gap between the external thread and the connecting thread.

2. A magnetic sealing device for a stirring shaft end according to claim 1, characterized in that: The magnetic ring is formed by a circle of magnetic columns.

3. A magnetic sealing device for agitator shaft end according to claim 1, characterized in that: A bearing retaining ring is disposed beside the first bearing and beside the second bearing at one end close to the corresponding sealing ring.

4. A magnetic sealing device for a stirring shaft end according to any one of claims 1 to 3, characterized in that: A plurality of shaft sleeve sealing rings are sleeved on the outer periphery of the stirring shaft body and the portion located inside the shaft sleeve.

5. A magnetic sealing device for a stirring shaft end according to any one of claims 1 to 3, characterized in that: The second bearing is far away from the driving ring, and a retaining spring is arranged on the stirring shaft body at the lower part of the second bearing; and a bearing cover for pressing the outer ring of the second bearing is arranged in the sealing seat.

6. A magnetic sealing device for agitator shaft end according to claim 5, characterized in that: A polytetrafluoroethylene lip seal is arranged in the sealing seat at the lower part of the bearing cover.

7. A magnetic sealing device for a stirring shaft end according to any one of claims 1 to 3, characterized in that: A sealing ring is arranged on the outer bottom of the sealing seat.

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