Positive pressure impact magnetohydrodynamic sealing structure

Abstract

This utility model relates to a positive pressure impact-resistant magnetic fluid sealing structure, comprising: a rotating shaft with a magnetic fluid groove on it; a hollow outer shell fitted over the rotating shaft, with a top cover at one end; the rotating shaft, outer shell, and top cover forming a hollow installation space; a magnetic fluid sealing assembly fitted over the rotating shaft and positioned within the installation space, the position of which corresponds to the position of the magnetic fluid groove; and a pressure-resistant assembly fitted over the rotating shaft and positioned within the installation space. The pressure-resistant assembly of this utility model constructs a comprehensive positive pressure protection system through multi-stage series pressure-resistant spacers, multiple oil seals, and O-rings, effectively resisting atmospheric positive pressure impacts and pressure fluctuations, completely solving the problems of easy magnetic fluid peeling and vacuum failure in ordinary structures, ensuring continuous and reliable sealing, and extending service life.

Description

Technical Field

[0001] This utility model belongs to the field of magnetic fluid sealing technology, and in particular, it is a magnetic fluid sealing structure resistant to positive pressure impact. Background Technology

[0002] In recent years, the development of vacuum equipment both domestically and internationally has been rapid. Magnetohydrodynamic (MHD) seals have been widely applied in many rotary sealing devices, such as those used in vacuum equipment like single-crystal silicon furnaces, vacuum brazing furnaces, vacuum melting furnaces, chemical vapor deposition, ion plating, and liquid crystal regeneration equipment, as well as in high-temperature, high-pressure equipment and equipment with stringent environmental requirements. This improves product quality and yields significant economic benefits.

[0003] Magnetofluid products are generally custom-made, as ordinary magnetofluids cannot withstand large positive pressure impacts. Currently, ordinary magnetofluids have magnetic fluid adsorbed on the magnetic poles, which serves as a seal. Under the impact of negative pressure at the vacuum end and positive pressure at the atmospheric end, the magnetic fluid peels off from the magnetic shoe, and the vacuum fails. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of this utility model is to provide a magnetohydrodynamic sealing structure that can withstand positive pressure impacts.

[0005] To solve the above-mentioned technical problems, this utility model provides a positive pressure impact-resistant magnetic fluid sealing structure, comprising: a rotating shaft with a magnetic fluid tank on it; a housing, which is a hollow structure and is fitted onto the outside of the rotating shaft, with a top cover at one end of the housing; the rotating shaft, the housing, and the top cover forming a hollow installation space; a magnetic fluid sealing assembly, fitted onto the outside of the rotating shaft and disposed within the installation space, the position of the magnetic fluid sealing assembly corresponding to the position of the magnetic fluid tank; and a pressure-resistant assembly, fitted onto the outside of the rotating shaft and disposed within the installation space.

[0006] The pressure-resistant assembly includes: a first spacer, which is sleeved on the outside of the rotating shaft and disposed within the mounting space; a second spacer, which is sleeved on the outside of the rotating shaft and disposed within the mounting space; the first spacer and the second spacer are respectively disposed on both sides of the magnetic fluid sealing assembly; and a spacer unit, which is sleeved on the outside of the rotating shaft and disposed within the mounting space, located between the second spacer and the top cover.

[0007] The spacer unit includes multiple pressure-resistant spacers, each pressure-resistant spacer comprising: a spacer body, which is sleeved on the outside of the rotating shaft and disposed within the mounting space; and an oil seal, which is disposed on the spacer body and located between the spacer body and the rotating shaft.

[0008] The number of oil seals is multiple.

[0009] An O-ring is provided on the spacer body, and the O-ring is located between the spacer body and the outer shell.

[0010] The magnetic fluid sealing assembly includes: two magnetic poles, which are spaced apart on the outside of the rotating shaft and whose positions correspond to the positions of the magnetic fluid tank; and a magnet disposed between the two magnetic poles.

[0011] A magnetic pole O-ring is provided on each of the two magnetic poles, and the magnetic pole O-ring is located between the magnetic pole and the outer shell.

[0012] A support assembly is also sleeved on the outside of the rotating shaft. The support assembly includes: a bearing unit, which is sleeved on the outside of the rotating shaft and disposed within the installation space; and an upper bearing, which is sleeved on the outside of the rotating shaft and disposed within the installation space; wherein the bearing unit is located on one side of the first spacer ring; and the upper bearing is located between the spacer ring unit and the top cover.

[0013] The bearing unit includes multiple lower bearings.

[0014] This utility model's pressure-resistant component constructs a comprehensive positive pressure protection system through multi-stage series pressure-resistant spacers, multiple oil seals, and O-rings. This effectively resists atmospheric positive pressure impacts and pressure fluctuations, completely solving the problems of easy magnetic fluid peeling and vacuum failure in ordinary structures, ensuring continuous and reliable sealing, and extending service life. Furthermore, the magnetic isolation design of the first and second spacers prevents the magnetic field from diffusing into the bearing, avoiding interference with bearing operation and improving device reliability and maintenance cycles. Attached Figure Description

[0015] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the positive pressure impact-resistant magnetohydrodynamic sealing structure of this utility model.

[0017] Explanation of reference numerals in the accompanying drawings of this utility model's positive pressure impact-resistant magnetohydrodynamic sealing structure: Detailed Implementation

[0018] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0019] For ease of description, 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 indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified. In this application, unless otherwise explicitly specified and limited, terms such as "installed," "connected," "joined," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0020] Unless otherwise specified, the terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains, and should be understood to have the meaning consistent with the meaning in the context of the relevant art, and should not be interpreted in an idealized or over-formalized manner, except as expressly defined in this invention.

[0021] like Figure 1As shown, this utility model's positive pressure impact-resistant magnetic fluid sealing structure achieves a synergistic improvement in sealing performance and pressure resistance through a scientifically and rationally designed component layout and structure. It mainly includes a rotating shaft 1, a housing 2, a magnetic fluid sealing assembly, a pressure-resistant assembly, and a support assembly. These components work together to ensure the core function of the rotary seal while also possessing excellent resistance to positive pressure impact and axial load bearing capacity. The rotating shaft 1, as the core transmission component of the entire device, has its two ends located in the positive pressure zone 15 and the negative pressure zone 16, respectively. It primarily bears the responsibility of transmitting rotational torque. A magnetic fluid groove 14 is specially provided on its surface, containing magnetic fluid, providing a crucial installation and adhesion foundation for the magnetic fluid seal. The housing 2 adopts a hollow structure design, fitting entirely around the outside of the rotating shaft 1, forming the external protective frame of the device. This protects the various functional components loaded inside from external environmental corrosion or damage. A top cover 3 is fitted at one end of the outer shell 2. The top cover 3 not only makes the installation of internal parts more compact and effectively reduces the space occupied by the overall structure, but also further protects the internal parts and prevents external impurities from entering. The rotating shaft 1, the outer shell 2 and the top cover 3 together form a hollow installation space. All functional components are reasonably set in this space according to the optimized layout, ensuring the integration and practicality of the structure.

[0022] The magnetic fluid sealing assembly is fitted onto the outside of the rotating shaft 1, with its installation position precisely corresponding to the magnetic fluid tank 14. It is the core component for achieving the rotary sealing function. This assembly consists of two magnetic poles 9 and a magnet 10. The two magnetic poles 9 are spaced apart on the outside of the rotating shaft 1, and the magnet 10 is fixedly connected between the two magnetic poles 9. The magnet 10 generates a stable and uniform magnetic field, allowing the magnetic fluid to be firmly adsorbed in the gap formed between the magnetic poles 9 and the magnetic fluid tank 14, forming a reliable magnetic sealing barrier to prevent gas leakage during rotation. To further improve the sealing performance between the magnetic fluid sealing assembly and the outer shell 2 and prevent gas leakage from the component assembly gap, magnetic pole O-rings 11 are fitted onto both magnetic poles 9. The magnetic pole O-rings 11 fit tightly between the magnetic poles 9 and the outer shell 2, effectively sealing potential leakage channels in this area, further strengthening the overall sealing effect, and laying the foundation for improved resistance to positive pressure impact.

[0023] The pressure-resistant component is also fitted onto the outside of the rotating shaft 1, located within the installation space. Its core function is to enhance the device's resistance to positive pressure impacts while isolating the magnetic field from adverse effects on other components. This component includes a first spacer 4, a second spacer 5, and a spacer unit. The first spacer 4 and the second spacer 5 are respectively positioned on both sides of the two magnetic poles 9, forming bidirectional protection and precise positioning for the magnetohydrodynamic sealing component. One side of the first spacer 4 connects to the bearing unit in the support assembly, and the other side is fixedly connected to the magnetic pole 9. One side of the second spacer 5 connects to the magnetic pole 9, and the other side fits tightly with the spacer unit. The first spacer 4 and the second spacer 5 effectively isolate the magnetic field loop generated by the magnetohydrodynamic sealing component, preventing magnetic field diffusion from affecting the normal operation of the bearing, ensuring the transmission stability of the support assembly, and indirectly improving the overall reliability of the sealing structure. The spacer unit is located between the second spacer 5 and the top cover 3, and is fitted around the outside of the rotating shaft 1. It consists of multiple pressure-resistant spacers connected in series. Each pressure-resistant spacer includes a spacer body 6, an oil seal 7, and a spacer O-ring 8. The spacer body 6 is fitted around the outside of the rotating shaft 1, and the oil seal 7 is installed between the spacer body 6 and the rotating shaft 1. Multiple oil seals 7 are used, and through the superimposed sealing design of multiple oil seals, the positive pressure impact from the atmosphere can be effectively sealed, preventing high-pressure gas from penetrating to the magnetic fluid sealing assembly. The spacer O-ring 8 is located between the spacer body 6 and the outer shell 2, precisely sealing the assembly gap between the spacer body 6 and the outer shell 2, further improving the overall sealing reliability of the pressure-resistant assembly. The series design of multiple sealing groups forms a multi-level pressure-resistant protection system, which can buffer and offset the pressure fluctuations caused by positive pressure impact layer by layer, significantly improving the device's tolerance limit to positive pressure impact, and fundamentally solving the technical problem of easy magnetic fluid peeling under positive pressure impact in ordinary magnetic fluid sealing structures.

[0024] The support assembly is sleeved on the outside of the rotating shaft 1, including a bearing unit and an upper bearing 13. The bearing unit is located on one side of the first spacer 4 and consists of multiple lower bearings 12. The inner ring of the lower bearing 12 is fixedly connected to the rotating shaft 1 and can rotate synchronously with the rotating shaft 1. Its outer ring cooperates with the outer shell 2 or adjacent components to provide reliable support for the high-speed and stable rotation of the rotating shaft 1, while distributing the radial load borne by the rotating shaft 1. The upper bearing 13 is located between the spacer unit and the top cover 3. One side of it is fixedly positioned by the top cover 3, and the other side is connected to the spacer unit. It not only provides stable support for the end of the rotating shaft 1, but also effectively bears a certain axial load. Together with the bearing unit, it achieves comprehensive support for the rotating shaft 1, ensuring the coaxiality and stability of the rotating shaft 1 during long-term operation, avoiding the impact of shaft shaking on the sealing effect, and further ensuring the operational reliability of the device under complex working conditions.

[0025] During operation, the power unit drives the rotating shaft 1 to rotate, causing the magnetic pole 9 to rotate along with the shaft. The magnet 10 remains fixed relative to the outer casing 2, maintaining the stability of the magnetic field. Under the influence of the magnetic field, the magnetic fluid remains firmly adhered between the magnetic pole 9 and the magnetic fluid tank 14, forming a dynamic sealing surface that effectively prevents gas leakage. Simultaneously, the positive pressure impact from the atmosphere is effectively buffered by the multi-stage oil seals 7 and O-rings 8, preventing pressure fluctuations from directly impacting the magnetic fluid sealing surface and avoiding the magnetic fluid from peeling off the magnetic pole 9, thus ensuring the effectiveness of the vacuum seal. The magnetic field isolation provided by the first and second spacers 4 ensures that the bearing unit and the upper bearing 13 are not disturbed by the magnetic field, maintaining smooth operation at all times. The coordinated work of all components achieves simultaneous improvements in sealing performance, resistance to positive pressure impact, and load-bearing capacity, enabling the device to adapt to more complex working environments.

[0026] The above description of the embodiments is provided to enable those skilled in the art to understand and use the present invention. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. A magnetohydrodynamic sealing structure resistant to positive pressure impact, characterized in that, include: A rotating shaft, on which a magnetic fluid tank is provided; The outer shell is a hollow structure and is fitted onto the outside of the rotating shaft. A top cover is provided at one end of the outer shell. The rotating shaft, the outer shell, and the top cover form a hollow mounting space; A magnetic fluid sealing assembly is sleeved on the outside of the rotating shaft and disposed within the installation space. The position of the magnetic fluid sealing assembly corresponds to the position of the magnetic fluid tank. A pressure-resistant component is sleeved on the outside of the rotating shaft and disposed within the installation space; The pressure-resistant component includes: The first spacer is sleeved on the outside of the rotating shaft and disposed within the mounting space; The second spacer is sleeved on the outside of the rotating shaft and disposed within the mounting space; The first spacer and the second spacer are respectively disposed on both sides of the magnetohydrodynamic sealing assembly; A spacer unit is sleeved on the outside of the rotating shaft and is disposed within the installation space, between the second spacer and the top cover.

2. The positive pressure impact-resistant magnetohydrodynamic sealing structure according to claim 1, characterized in that, The spacer unit includes multiple pressure-resistant spacers, and the pressure-resistant spacers include: Spacer body, the spacer body is sleeved on the outside of the rotating shaft, the spacer body is disposed within the installation space; An oil seal is disposed on the spacer body and is located between the spacer body and the rotating shaft.

3. The positive pressure impact-resistant magnetohydrodynamic sealing structure according to claim 2, characterized in that, The number of oil seals is multiple.

4. The positive pressure impact-resistant magnetohydrodynamic sealing structure according to claim 2, characterized in that, An O-ring is provided on the spacer body, and the O-ring is located between the spacer body and the outer shell.

5. The positive pressure impact-resistant magnetohydrodynamic sealing structure according to claim 1, characterized in that, The magnetohydrodynamic sealing assembly includes: The magnetic poles are two in number, and the two magnetic poles are spaced apart on the outside of the rotating shaft. The positions of the magnetic poles correspond to the positions of the magnetic fluid tank. A magnet, wherein the magnet is disposed between the two magnetic poles.

6. The positive pressure impact-resistant magnetohydrodynamic sealing structure according to claim 5, characterized in that, A magnetic pole O-ring is provided on each of the two magnetic poles, and the magnetic pole O-ring is located between the magnetic pole and the outer shell.

7. The positive pressure impact-resistant magnetohydrodynamic sealing structure according to claim 1, characterized in that, A support assembly is also sleeved on the outside of the rotating shaft, the support assembly comprising: A bearing unit, wherein the bearing unit is sleeved on the outside of the rotating shaft and disposed within the mounting space; An upper bearing is sleeved on the outside of the rotating shaft and disposed within the mounting space; wherein... The bearing unit is located on one side of the first spacer ring; The upper bearing is located between the spacer unit and the top cover.

8. The positive pressure impact-resistant magnetohydrodynamic sealing structure according to claim 7, characterized in that, The bearing unit includes multiple lower bearings.

Images