Magnetic sealing device for stirring shaft end

Abstract

The utility model discloses a stirring shaft end magnetic sealing device, which relates to the technical field of stirring equipment and comprises a stirring shaft body, a driving ring is sleeved on the outer top of the stirring shaft body, a shaft sleeve is sleeved outside the stirring shaft body, a sealing seat is sleeved outside the shaft sleeve, and a magnetic sealing component 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 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 under the matching of the magnetic sealing assembly, 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] This utility model relates to the field of mixing equipment technology, and more specifically, to a magnetic sealing device for the end of a mixing shaft. Background Technology

[0002] The agitator shaft is a key component in industrial mixing equipment, primarily used to transmit external power to the mixing device to achieve process requirements such as mixing, dispersing, emulsifying, or heat transfer of materials. During operation, if the end of the agitator shaft is not effectively sealed, internal liquids, gases, or other media can easily leak, causing material loss and equipment instability. Therefore, sealing the agitator shaft end is a crucial aspect of industrial mixing equipment design, its core function being to prevent media leakage and protect the stability of equipment operation.

[0003] Traditional mechanical seals prevent media leakage by forming a sealing surface through a friction pair between a stationary ring and a rotating ring. However, when handling media containing particles, solid impurities, or high viscosity, these impurities may enter the gaps between the friction pairs, damaging the sealing surface and reducing sealing performance. Furthermore, under high pressure, high speed, or complex media (such as corrosive media), the sealing surface may undergo slight deformation, leading to increased gaps and media leakage. Overall, the sealing effect and service life of traditional sealing technologies are significantly limited under high pressure, high temperature, vacuum, or corrosive conditions.

[0004] No effective solutions have yet been proposed to address the problems in the relevant technologies. Utility Model Content

[0005] In view of the problems in the related technologies, this utility model proposes a magnetic sealing device for the stirring shaft end to overcome the above-mentioned technical problems existing in the existing related technologies.

[0006] Therefore, the specific technical solution adopted by this utility model is as follows:

[0007] A magnetic sealing device for a stirring shaft end includes a stirring shaft body. A driving ring is fitted onto the outer top of the stirring shaft body. The device is characterized in that a bushing is fitted around the outside of the stirring shaft body, and a sealing seat is fitted around the outside of the bushing. A first bearing and a second bearing are arranged side-by-side between the bushing and the sealing seat. A magnetic sealing assembly is provided between the bushing and the sealing seat, between the first bearing and the second bearing. A sealing cap is provided on the sealing seat.

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

[0009] As a preferred embodiment, the magnetic ring is formed by a ring of magnetic pillars.

[0010] As a preferred embodiment, a bearing retaining ring is provided at one end of the first bearing and the second bearing near the corresponding sealing ring.

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

[0012] As a preferred embodiment, the second bearing is located away from the drive ring, and a retaining ring is provided on the lower part of the second bearing on the stirring shaft body; the sealing seat is provided with a bearing cap that presses against the outer ring of the second bearing.

[0013] As a preferred embodiment, the sealing seat is provided with a PTFE lip seal at the lower part of the bearing cover.

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

[0015] The beneficial effects of this utility model are as follows:

[0016] 1. With the combined action of the bushing seal ring, bushing, sealing seat and magnetic sealing assembly, this utility model can guide the magnetic fluid to approach the sealing ring through the magnetic attraction between the magnetic materials to form a tight seal, avoiding the leakage problem caused by contact wear of traditional mechanical seals. Moreover, the structural design between the sealing seat and the bushing can withstand high pressure, and the magnetic seal will not fail due to pressure increase, solving the defect of shortened life of traditional mechanical seals due to friction and wear.

[0017] 2. By setting a bushing sealing ring, this utility model can effectively reduce the gap between the stirring shaft body and the bushing. With the cooperation of the magnetic sealing assembly, the magnetic fluid filled with magnetic fluid is brought close to the sealing ring by magnetic force through the magnetic ring and the sealing rings at both ends, forming a tight seal. At the same time, the magnetic fluid can adapt and adjust according to pressure changes, further enhancing the sealing effect of the magnetic sealing assembly. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

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

[0021] In the picture:

[0022] 1. Stirring shaft body; 2. Drive ring; 3. Shaft sleeve; 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. Snap ring; 507. PTFE lip seal; 6. Shaft sleeve sealing ring. Detailed Implementation

[0023] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings 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, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

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

[0025] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figures 1-2 As shown, the magnetic sealing device for the stirring shaft end according to an embodiment of the present utility model includes a stirring shaft body 1, a drive ring 2 is sleeved on the top of the stirring shaft body 1, a bushing 3 is sleeved on the outside of the stirring shaft body 1 (the bushing 3 is sleeved on the stirring shaft body 1 that needs to be sealed at the end, the stirring shaft body 1 can pass through the bushing 3 as required, and the bushing 3 can also be closed at one end), and a sealing seat 4 is sleeved on the outside of the bushing 3, and a magnetic sealing assembly 5 is provided between the bushing 3 and the sealing seat 4.

[0026] With the help of the above solution, under the combined action of the bushing seal ring 6, bushing 3, sealing seat 4 and magnetic sealing assembly 5, this utility model can guide the magnetic fluid to approach the sealing ring 502 through the magnetic attraction between the magnetic materials to form a tight seal, avoiding the leakage problem caused by contact wear of traditional mechanical seals. Moreover, the structural design between the sealing seat 4 and bushing 3 can withstand high pressure, and the magnetic seal will not fail due to pressure increase, thus solving the defect of shortened life of traditional mechanical seals due to friction and wear.

[0027] In one embodiment, the magnetic sealing assembly 5 includes a magnetic ring 501 disposed between the bushing 3 and the sealing seat 4. Both ends of the magnetic ring 501 are provided with sealing rings 502 that cooperate with the bushing 3 (one sealing ring 502 is disposed above and below the magnetic ring, and the sealing rings 502 are threadedly engaged with the bushing 3, with sealing fluid filling the two threads). The magnetic ring 501 is formed by combining several magnetic pillars 5011. One end of each of the two sets of sealing rings 502 is respectively provided with a first bearing 503 and a second bearing 504, and each end of the first bearing 503 and the second bearing 504 is provided with a bearing retainer ring 505. Thus, through the magnetic ring 501 and the sealing rings 502 at both ends, the filled magnetic fluid is brought close to the sealing rings 502 by magnetic force, forming a tight seal. Simultaneously, the magnetic fluid can adapt to pressure changes, further enhancing the sealing effect of the magnetic sealing assembly 5. A sealing cap is provided on the sealing seat 4.

[0028] Specifically, a number of magnetic pillars 5011 are arranged to form a magnetic ring 501, which makes the magnetic field distribution more uniform and enhances the guiding force of the magnetic fluid. Under the action of magnetic force, the magnetic fluid can more stably approach the sealing ring 502 to form a strong sealing barrier. In practical applications, the magnetic ring 501 is formed by arranging a number of magnetic pillars 5011 or is directly set as a magnetic ring 501.

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

[0030] In one embodiment, the second bearing 504 is located away from the drive ring, and a retaining ring 506 is provided on the lower part of the second bearing 504 on the stirring shaft body 1; the sealing seat 4 is provided with a bearing cap that presses against the outer ring of the second bearing 504. This can stabilize the connection between the bearing and other sealing components and prevent displacement or loosening during operation.

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

[0032] Specifically, the PTFE lip seal 507 is a seal made of polytetrafluoroethylene (PTFE). The PTFE lip seal forms a dynamic seal by closely adhering to the shaft surface through its lip design. It can maintain a sealed state when the stirring shaft rotates at high speed or when the medium pressure fluctuates. The PTFE lip seal 507 can effectively prevent medium leakage and prevent external impurities from entering the sealing cavity.

[0033] To facilitate understanding of the above-mentioned technical solutions of this utility model, the working principle or operation method of this utility model in actual process will be described in detail below.

[0034] In practical applications, the drive ring 2 is first driven to rotate by an external power device, which in turn drives the stirring shaft body 1 to rotate. Several bushing seals 6 inside the bushing 3 form a first layer of sealing barrier, preventing the stirring medium from leaking out along the gap between the stirring shaft body 1 and the bushing 3. The sealing ring 401 at the bottom of the sealing seat forms a second layer of sealing barrier, thus preventing medium leakage while protecting the sealing cavity from external contamination. Inside the working chamber, the magnetic ring 501 in the magnetic sealing assembly 5 guides the magnetic fluid towards the sealing ring 502, filling tiny gaps and forming a dynamic, non-contact seal. One end of each of the two sets of sealing rings 502 supports the rotating components of the stirring shaft body 1 through the first bearing 503 and the second bearing 504. The retaining ring 506 at the bottom of the second bearing 504 provides structural support for the bottom seal of the sealing assembly. Simultaneously, the PTFE lip seal 507 utilizes its flexible fitting characteristics to further prevent medium leakage from the bottom and block external contaminants from entering, thereby effectively enhancing the sealing effect of the magnetic sealing device at the stirring shaft end.

[0035] In summary, by utilizing the above-mentioned technical solution of this utility model, under the combined action of the bushing sealing ring 6, bushing 3, sealing seat 4, and magnetic sealing assembly 5, this utility model can guide the magnetic fluid close to the sealing ring 502 through the magnetic attraction between the magnetic materials to form a tight seal, avoiding the leakage problem caused by contact wear of traditional mechanical seals. Moreover, the structural design between the sealing seat 4 and bushing 3 can withstand high pressure, and the magnetic seal will not fail due to pressure increase, solving the defect of shortened lifespan caused by friction and wear of traditional mechanical seals. By setting the bushing sealing ring 6, this utility model can effectively reduce the gap between the stirring shaft body 1 and the bushing 3. With the cooperation of the magnetic sealing assembly 5, the magnetic fluid filled by the magnetic ring 501 and the sealing rings 502 at both ends is brought close to the sealing ring 502 by magnetic force, forming a tight seal. At the same time, the magnetic fluid can adapt and adjust according to pressure changes, further enhancing the sealing effect of the magnetic sealing assembly 5.

[0036] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection 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 utility model according to the specific circumstances.

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

Claims

1. A magnetic sealing device for a stirring shaft end, comprising a stirring shaft body, wherein a drive ring is sleeved on the outer top of the stirring shaft body, characterized in that, The stirring shaft body is fitted with a bushing, and a sealing seat is fitted with a sealing seat. A first bearing and a second bearing are arranged side by side between the bushing and the sealing seat. A magnetic sealing assembly is provided between the bushing and the sealing seat and between the first bearing and the second bearing. A sealing cap is provided on the sealing seat. The magnetic sealing assembly includes a pair of sealing rings disposed between the bushing and the sealing seat, a magnetic ring between the pair of sealing rings, an external thread in the middle of the outer circumference of the bushing, a matching connecting thread on the inner ring of the sealing ring, and magnetic fluid filling the gap between the external thread and the connecting thread.

2. The magnetic sealing device for the end of a stirring shaft according to claim 1, characterized in that, The magnetic ring is formed by a series of magnetic pillars.

3. The magnetic sealing device for the end of a stirring shaft according to claim 1, characterized in that, Bearing retaining rings are provided at one end of the first bearing and the second bearing near the corresponding sealing ring.

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

5. A magnetic sealing device for the end of a stirring shaft according to any one of claims 1-3, characterized in that, The second bearing is located away from the drive ring, and a retaining ring is provided on the lower part of the second bearing on the stirring shaft body; the sealing seat is provided with a bearing cap that presses against the outer ring of the second bearing.

6. The magnetic sealing device for the end of a stirring shaft according to claim 5, characterized in that, The sealing seat is provided with a PTFE lip seal at the lower part of the bearing cover.

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

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