Anti-deflection strong-corrosion working condition dry gas sealing structure
By connecting the bellows on the stationary ring seat and combining the lip-shaped sealing structure, the sealing problem of double-end dry air sealing under poor equipment accuracy and strong corrosion conditions is solved, and better anti-swing and corrosion resistance are achieved.
Patent Information
- Application Number
- CN202420417443.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-04
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-03-04
AI Technical Summary
The existing double-end dry air seals have poor equipment accuracy and large shaft jumps, and have poor seal follow-up ability and weak anti-swing ability, which are prone to leakage or seal failure, and are easily damaged under strong corrosion conditions.
A dry air-seal structure with anti-slant corrosion is designed. By connecting the corrugated pipe on the stationary ring seat, it is connected to the stationary parts of the central shaft equipment. It adopts a medium-side and atmospheric dry air-seal mechanism, including the moving ring and Static ring assembly, which absorbs eclipse and vibration using bellows and spring structures, and adds a lip structure to the sealing end face to prevent solid particles from building up.
It improves the anti-swing performance and durability of the seal, and is suitable for equipment with low accuracy and large shaft jumps, reducing the risk of leakage and maintaining the sealing effect in a highly corrosive environment.
Smart Images
Figure CN222141973U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of dry gas sealing structures, in particular to a dry gas sealing structure that resists deflection and strong corrosion conditions. Background Art
[0002] Double dry gas seal is a special design for shaft sealing, usually used in high-speed rotating equipment such as turbines, centrifugal compressors, etc. Unlike traditional single seals, double seals are equipped with sealing devices on both sides of the shaft, making the sealing effect more reliable. Double dry gas seals usually consist of two sets of friction pairs, located at both ends of the sealing ring. The two sets of friction pairs usually consist of a stationary ring fixed on the sealing ring and a dynamic ring connected to the shaft and capable of rotating. The gap between the stationary ring and the dynamic ring is filled with gas, usually compressed air or inert gas. When the shaft rotates, the dynamic ring also rotates, while the stationary ring remains fixed. Due to the presence of gas, an air film is formed between the stationary ring and the dynamic ring, thereby reducing friction and wear and achieving a good sealing effect.
[0003] In the prior art, a double-face dry gas seal includes two sets of friction pairs, and the two sets of friction pairs are arranged in face-to-face, back-to-back, and in series. Conventional double-face dry gas seals usually connect the medium-side sealing static ring seat to the stationary part of the sealed equipment through rigid fasteners. When the equipment accuracy is poor and the shaft runout is large, the seal has poor followability and weak anti-sway ability, which is prone to large leakage or seal failure. At the same time, the medium-side sealing end face of the conventional double-face dry gas seal is usually in direct contact with the medium. If there are solid particles in the medium or solid particles are generated through physical and chemical reactions under working conditions, it is easy to cause contamination of the main sealing end face and reduce the service life. In addition, the shaft sleeve and static ring seat of the conventional double-face dry gas seal that are in contact with the medium are metal parts, which are easily damaged when the medium is highly corrosive.
[0004] In view of this, this application is hereby filed. Utility Model Content
[0005] The purpose of the utility model is to provide a dry gas sealing structure that is resistant to deflection and strong corrosion conditions. By connecting a bellows to the static ring seat, the bellows is connected to the static part of the central axis equipment to solve the problem in the prior art that the medium-side sealing static ring seat is directly connected to the static part of the sealed equipment. When the equipment accuracy is poor and the axis runout is large, the sealing has poor follow-up performance and weak anti-deflection ability, which is prone to large leakage or sealing failure.
[0006] The utility model embodiment is realized by the following technical scheme: providing a dry gas sealing structure for anti-deflection and strong corrosion working conditions, including a medium-side dry gas sealing mechanism and an atmosphere-side dry gas sealing mechanism installed on a central axis device, a shaft sleeve assembly is arranged between the medium-side dry gas sealing mechanism and the central axis device and between the atmosphere-side dry gas sealing mechanism, the medium-side dry gas sealing mechanism includes a medium-side dynamic ring assembly and a medium-side static ring assembly, and the atmosphere-side dry gas sealing mechanism includes an atmosphere-side dynamic ring assembly and an atmosphere-side static ring assembly;
[0007] The moving ring assembly on the medium side and the moving ring assembly on the atmosphere side can rotate with the central axis equipment;
[0008] The medium side dynamic ring assembly includes a medium side dynamic ring and a medium side dynamic ring seat, the medium side static ring assembly includes a medium side static ring and a medium side static ring seat, an air film can be formed between the medium side dynamic ring and the medium side static ring, the atmosphere side dynamic ring assembly includes an atmosphere side dynamic ring and an atmosphere side dynamic ring seat, the atmosphere side static ring assembly includes an atmosphere side static ring and an atmosphere side static ring seat, an air film can be formed between the atmosphere side dynamic ring and the atmosphere side static ring;
[0009] Among them, a bellows is connected to the medium side static ring seat and / or the atmosphere side static ring seat, one end of the bellows is connected to the medium side static ring seat and / or the atmosphere side static ring seat, and the other end is connected to the stationary part of the central axis equipment.
[0010] Preferably, the medium-side stationary ring assembly and / or the atmosphere-side stationary ring assembly are connected to the central axis device via bearings.
[0011] Preferably, a first spring is installed in the atmosphere side dynamic ring seat, and when the first spring is in a free state, the atmosphere side dynamic ring fits with the atmosphere side static ring, and a second spring is installed in the medium side static ring seat, and when the second spring is in a free state, the medium side static ring fits with the medium side dynamic ring.
[0012] Preferably, the sleeve assembly includes a medium side sleeve and an atmosphere side sleeve, the medium side sleeve is arranged in axial contact with the atmosphere side sleeve, a first anti-rotation pin is arranged between the medium side sleeve, the medium side movable ring and the atmosphere side movable ring seat, and all of them can rotate with the central axis equipment, and the atmosphere side movable ring can rotate with the atmosphere side movable ring seat.
[0013] Preferably, a bearing seat is provided on the bearing, a pressure cover is provided on the atmospheric side of the bearing seat, the medium side next to the bearing seat is the atmospheric side static ring seat, the medium side static ring seat is arranged on the atmospheric side of the medium side dynamic ring, and the pressure cover, the bearing seat, the atmospheric side static ring seat and the medium side static ring seat are connected together by studs.
[0014] Preferably, a first bellows gland and a second bellows gland are respectively provided at both ends of the bellows, the first bellows gland is fitted with the medium-side stationary ring seat, the second bellows gland is connected to the stationary part of the central axis equipment, and the medium-side stationary ring seat and the first bellows gland and the second bellows gland are connected in series through a second anti-rotation pin.
[0015] Preferably, a lip sealing structure is provided on the medium-side end surface of the medium-side dry gas sealing structure.
[0016] Preferably, the lip sealing structure is made of plastic.
[0017] Preferably, the medium-side end surface of the medium-side stationary ring seat is made of silicon carbide, and the shaft sleeve assembly is made of silicon carbide.
[0018] Preferably, the bellows is made of EPDM rubber.
[0019] The embodiment of the utility model provides a dry gas sealing structure for anti-deflection and strong corrosion conditions, which has the following beneficial effects:
[0020] 1. The embodiment of the utility model provides a double-end dry gas seal structure, that is, a double-end air film seal, which not only has good sealing performance, but also is wear-resistant, durable and has good new performance. The sealing stationary part is connected to the stationary part of the sealed equipment through a bellows, which greatly reduces the damage to the seal caused by the deflection of the shaft. It can be used in harsh working conditions such as poor equipment accuracy, large shaft runout, medium containing solid particles, and highly corrosive medium.
[0021] 2. The bellows structure of the embodiment of the utility model can also cooperate with the bearing between the sealing rotating part and the stationary part to further improve the vibration resistance. When the shaft deflects greatly, the sealing rotating part and the stationary part deflect with the shaft, and the relative accuracy of the sealing end face is better.
[0022] 3. Adding a lip seal at the front end of the seal can prevent the accumulation of solid particles in the medium at the seal on the medium side, affecting the floatability of the seal and causing damage to the seal end face.
[0023] 4. The medium side seal adopts an inner air intake structure. Compared with the outer air intake structure, the inner air intake can reduce the area of metal parts in contact with the medium.
[0024] 5. The medium side static ring seat and the medium contact part are made of silicon carbide, the front end sleeve is also made of silicon carbide, the lip seal seat is made of plastic, and the bellows is made of EPDM. The corrosion resistance is improved, and the seal can work in highly corrosive media.
[0025] In general, the embodiments of the utility model provide a dry gas sealing structure that is resistant to deflection and strong corrosion conditions. By connecting a bellows to the static ring seat, the bellows is connected to the stationary parts of the central axis equipment, so that the seal has better anti-deflection performance, thereby achieving the purpose of being suitable for equipment with low precision and large shaft runout. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.
[0027] Figure 1 A schematic diagram of a dry gas seal structure for anti-deflection and strong corrosion conditions provided by an embodiment of the utility model;
[0028] Figure 2 A schematic diagram of a lip seal structure provided in an embodiment of the utility model.
[0029] Marks and corresponding parts names in the attached drawings:
[0030] 1-central axis equipment, 2-medium side dynamic ring, 3-medium side dynamic ring seat, 4-medium side static ring, 5-medium side static ring seat, 6-atmospheric side dynamic ring, 7-atmospheric side dynamic ring seat, 8-atmospheric side static ring, 9-atmospheric side static ring seat, 10-bellows, 11-bearing, 12-first spring, 13-second spring, 14-medium side sleeve, 15-atmospheric side sleeve, 16-first anti-rotation pin, 17-bearing seat, 18-pressure cover, 19-stud, 20-second anti-rotation pin, 21-lip seal structure, 22-first bellows pressure cover, 23-second bellows pressure cover, 24-drive ring, 25-locking nut, 26-stop gasket, 27-clamp ring, 28-washer, 29-pressure sleeve, 30-locking screw, 33-push ring, 31-first lip seat, 32-second lip seat. DETAILED DESCRIPTION
[0031] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. The components of the embodiment of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.
[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0034] In the description of the present invention, it should be noted that the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.
[0035] Example
[0036] like Figure 1 As shown, the embodiment of the utility model provides a dry gas sealing structure for anti-sway strong corrosion working conditions, including a medium side dry gas sealing mechanism and an atmosphere side dry gas sealing mechanism installed on the central axis device 1, a sleeve assembly is arranged between the medium side dry gas sealing mechanism and the central axis device 1, and between the atmosphere side dry gas sealing mechanism, for supporting and fixing the sealing structure, the medium side dry gas sealing mechanism includes a medium side dynamic ring assembly and a medium side static ring assembly, and the atmosphere side dry gas sealing mechanism includes an atmosphere side dynamic ring assembly and an atmosphere side static ring assembly; it should be noted that the axis device here refers to a core component or core axis in a type of equipment or mechanical device, including turbines, generators, pump equipment, etc., and its axis is regarded as the core component of the equipment, responsible for transmitting power or bearing loads. Usually, it involves components, seals, bearings, etc. related to the shaft, because the stability and operating status of the axis device are crucial to the normal operation of the entire equipment.
[0037] The medium side moving ring assembly and the atmosphere side moving ring assembly can rotate with the central axis device 1; the medium side moving ring assembly includes a medium side moving ring 2 and a medium side moving ring seat 3, the medium side static ring assembly includes a medium side static ring 4 and a medium side static ring seat 5, an air film can be formed between the medium side moving ring 2 and the medium side static ring 4, the atmosphere side moving ring assembly includes an atmosphere side moving ring 6 and an atmosphere side moving ring seat 7, the atmosphere side static ring seat 9 includes an atmosphere side static ring 8 and an atmosphere side static ring seat 9, an air film can be formed between the atmosphere side moving ring 6 and the atmosphere side static ring 8; wherein, a bellows 10 is connected to the medium side static ring seat 5 and / or the atmosphere side static ring seat 9, one end of the bellows 10 is connected to the medium side static ring seat 5 and / or the atmosphere side static ring seat 9, and the other end is connected to the stationary part of the central axis device 1, the bellows 10 is used to absorb the deflection and vibration of the shaft, and at the same time has certain elasticity and corrosion resistance.
[0038] In the design, preferably, the medium side stationary ring assembly and / or the atmosphere side stationary ring assembly are connected to the central axis device 1 through a bearing. This structure can improve the stability and reliability of the relative movement between the sealing components. The bearing 11 connection can reduce friction and wear, while increasing the service life of the sealing component, and can also effectively reduce leakage at the seal, improve the sealing effect, and is suitable for working conditions that require high reliability and sealing performance. That is, in the embodiment of the utility model, the sealing rotating part can be locked on the shaft through the drive ring 24 and the anti-rotation pin, and the sealing stationary part is connected to the stationary part of the sealed device through the bellows 10 and the anti-rotation pin. At the same time, a bearing 11 is arranged between the sealing rotating part and the stationary part. In this way, when the shaft deflection is large, the sealing rotating part and the stationary part both deflect with the shaft, and the relative accuracy of the sealing end face is good, which greatly reduces the damage that the shaft deflection may cause to the seal. It should be noted that the bearing 11 on the medium side and the bearing 11 on the atmosphere side can be set either one or both, and there is no restriction here, as long as sufficient anti-vibration effect can be achieved.
[0039] Furthermore, a first spring 12 is installed in the atmosphere side dynamic ring seat 7. When the first spring 12 is in a free state, the atmosphere side dynamic ring 6 fits with the atmosphere side static ring 8. A second spring 13 is installed in the medium side static ring seat 5. When the second spring 13 is in a free state, the medium side static ring 4 fits with the medium side dynamic ring 2. The first spring 12 and the second spring 13 respectively adjust the fit between the atmosphere side dynamic ring 6 and the atmosphere side static ring 8 and between the medium side static ring 4 and the medium side dynamic ring 2. When the first spring 12 is in a free state, it makes the atmosphere side dynamic ring 6 fit with the atmosphere side static ring 8. This fit helps to form a sealed air film and reduce leakage. Similarly, when the second spring 13 is in a free state, it makes the medium side static ring 4 fit with the medium side dynamic ring 2, which also helps to form a sealed air film and reduce leakage.
[0040] The sleeve assembly includes a medium-side sleeve 14 and an atmosphere-side sleeve 15. The medium-side sleeve 14 is arranged in axial contact with the atmosphere-side sleeve 15. The two sleeves are located at both ends of the sealing system and are connected to the sealing assemblies on the medium side and the atmosphere side, respectively, to support the stability of the shaft or the overall structure of the sealing system. A first anti-rotation pin 16 is arranged between the medium-side sleeve 14, the medium-side movable ring 2, and the atmosphere-side movable ring seat 7, and all of them can rotate with the central shaft device 1. The atmosphere-side movable ring 6 can rotate with the atmosphere-side movable ring seat 7. The first anti-rotation pin 16 can ensure that the medium-side sleeve 14, the medium-side movable ring 2, and the atmosphere-side movable ring seat 7 rotate synchronously. A bearing seat 17 can also be arranged on the bearing 11 to support and fix the bearing 11. A pressure cover 18 is arranged on the atmosphere side of the bearing seat 17 to protect the bearing 11 and the bearing seat 17 from dust or other substances. The medium side next to the bearing seat 17 is the atmosphere side static ring seat 9, the medium side static ring seat 5 is arranged on the atmosphere side of the medium side dynamic ring 2, and the gland 18, the bearing seat 17, the atmosphere side static ring seat 9 and the medium side static ring seat 5 are connected together by studs. The gas side static ring seat and the medium side static ring seat 5 are respectively located on the atmosphere side and the medium side next to the bearing seat 17, and are used to support and fix the static ring assembly, forming a sealing structure with the dynamic ring assembly. The stud connection is a connection method for connecting the gland 18, the bearing seat 17, the atmosphere side static ring seat 9 and the medium side static ring seat 5. These components are connected together by studs to ensure the relative position static and tightness between these components.
[0041] Furthermore, a first bellows gland 22 and a second bellows gland 23 are respectively provided at both ends of the bellows 10, the first bellows gland 22 is fitted with the medium-side stationary ring seat 5, the second bellows gland 23 is connected to the stationary part of the central axis equipment 1, and the medium-side stationary ring seat 5 and the first bellows gland 22 and the second bellows gland 23 are connected in series through the second anti-rotation pin 20. Specifically, the bellows 10 is a pipe with a certain elasticity, used to connect or transfer media, and can absorb certain vibrations and deformations. The first bellows gland 22 and the second bellows gland 23 are respectively provided at both ends of the bellows 10. The first bellows gland 22 is in contact with or fits with the medium-side stationary ring seat 5, and is used to fix the bellows 10 and the sealing assembly to prevent leakage. The second bellows gland 23 is connected to the stationary parts of the central axis device 1. The stationary parts refer to parts that do not rotate with the shaft and are used to transfer force or support structures. The medium-side stationary ring seat 5 and the first bellows gland 22 and the second bellows gland 23 are connected in series through the second anti-rotation pin 20 to prevent the bellows 10 from rotating and maintain the stability of the sealing structure. This structure can ensure the normal operation of the bellows 10 and the reliability of the sealing system, and is suitable for working conditions that need to withstand certain vibrations and deformations.
[0042] Furthermore, if Figure 2As shown, a lip-shaped sealing structure is provided on the medium-side end face of the medium-side dry gas sealing structure, and a lip-shaped sealing structure is provided on the medium-side end face of the medium-side dry gas sealing structure. This structure can further improve the sealing effect. The lip-shaped sealing structure is a special sealing form. By providing a lip-shaped structure on the sealing end face, the sealing area can be increased, the sealing efficiency can be improved, and leakage can be reduced. The lip-shaped sealing structure can adapt to different working conditions, has good sealing performance and wear resistance, and is particularly suitable for applications in high-speed rotating equipment and strong corrosion conditions. Of course, as a preferred embodiment of the utility model, the lip-shaped sealing structure is made of plastic material. The plastic material needs to have good wear resistance and corrosion resistance to ensure that the sealing structure is not corroded and worn by the medium during long-term use. The lip-shaped sealing structure of the plastic material needs to have good elasticity and deformation ability to ensure that it can be effectively sealed during work. The plastic material needs to be able to adapt to the working environment under different temperature and pressure conditions to ensure a stable sealing effect. That is, in the embodiment of the utility model, an auxiliary lip seal is added at the front end of the dry gas seal to prevent solid particles in the process medium from entering the sealing end face on the medium side, thereby preventing the accumulation of solid particles in the medium at the sealing point, affecting the floatability of the seal and causing damage to the sealing end face.
[0043] Of course, the medium side end face of the medium side stationary ring seat 5 can also be made of silicon carbide material, the sleeve assembly can be made of silicon carbide material, and the bellows 10 can be made of ethylene propylene rubber material, because silicon carbide material has excellent wear resistance, high temperature resistance and chemical stability, and is very suitable as the material of the medium side stationary ring seat 5 and the sleeve assembly. Silicon carbide material performs well under high temperature, high pressure and corrosive media, can ensure the stability and durability of the sealing system, can effectively improve the reliability and service life of the sealing system, and is suitable for working environments requiring high wear resistance and high temperature stability. Ethylene propylene rubber (EPDM) is an excellent rubber material with excellent aging resistance, heat resistance and weather resistance, and is suitable for sealing and vibration absorption under various environmental conditions. The use of ethylene propylene rubber material in the bellows 10 can provide good elasticity and sealing performance, and at the same time has good corrosion resistance and wear resistance, is suitable for applications under some special working conditions, and can improve the service life and reliability of the bellows 10.
[0044] For example, Figure 1 and Figure 2As shown, for ease of understanding, the upper end is the atmosphere side, the lower end is the medium side, one end of the medium side sleeve 14 abuts on the shaft shoulder, and the other end abuts on the atmosphere side sleeve 15, and the atmosphere side sleeve 15 is locked on the shaft through the drive ring 24. The medium side movable ring 2, the clamping sleeve 29, the clamping ring 27, the atmosphere side movable ring seat 7, the washer 28, and the bearing 11 are arranged closely in sequence along the axial direction, and are pressed on the rear end sleeve through the stop washer 26 and the locking nut 25. The front end sleeve, the medium side movable ring 2, the atmosphere side movable ring seat 7, and the washer 28 are rotated with the shaft through the first anti-rotation pin 16, and the first anti-rotation pin 16 here is multiple. The push ring 33 and the atmosphere side movable ring 6 are rotated with the atmosphere side movable ring seat 7 through the anti-rotation structure.
[0045] The gland 18, the bearing seat 17, the atmosphere side stationary ring seat 9, and the medium side stationary ring seat 5 are connected together by studs. The two ends of the bellows 10 are connected to the medium side stationary ring seat 5 and the stationary part of the sealed equipment through the first bellows gland 22 and the second bellows gland 23, respectively, to form a flexible sealing cavity to isolate the medium from the atmosphere. The anti-rotation pin connects the medium side stationary ring seat 5 with the first bellows gland 22 and the second bellows gland 23 in series. The locking screw 30 locks the second bellows gland 23 on the stationary part of the sealed equipment. The relative rotation between the atmosphere side stationary ring seat 9 and the atmosphere side stationary ring 8, and the relative rotation between the medium side stationary ring seat 5 and the medium side stationary ring 4 are limited by the anti-rotation structure.
[0046] The first spring 12 is installed in the atmosphere side dynamic ring seat 7, and is closely arranged with the push ring 33 and the atmosphere side dynamic ring 6 in sequence, so that the atmosphere side dynamic ring 6 is closely fitted with the atmosphere side static ring 8 to form the atmosphere side sealing end face. The spring is installed in the medium side static ring seat 5, and acts on the medium side static ring 4, so that it is closely fitted with the medium side dynamic ring 2 to form the medium side sealing end face.
[0047] When the shaft deflects during rotation, the portion above the bellows 10 deflects along with the shaft. The bellows 10 is a flexible component, and the second bellows gland 23, the lip seal structure, the first lip seat 31, and the second lip seat 32 do not deflect along with the shaft. As far as the sealing end face is concerned, both the rotating and stationary parts of the sealing end face deflect along with the shaft at the same angle, with good relative accuracy, which can ensure a good sealing effect.
[0048] like Figure 2As shown, the medium side seal adopts an inner air intake structure. Compared with the outer air intake structure, the inner air intake can reduce the area of metal parts in contact with the medium. At the same time, the medium side static ring seat 5 is made of silicon carbide material for the part in contact with the medium, the front end sleeve is also made of silicon carbide material, the first lip seat 31 and the second lip seat 32 are made of plastic material, and the bellows 10 is made of EPDM rubber. In this way, the corrosion resistance of the above parts can be improved, and the seal can work in highly corrosive media. Adding a lip seal structure and a lip seal seat at the front end of the seal can prevent the accumulation of solid particles in the medium at the medium side seal, which affects the floatability of the seal and causes damage to the seal end face.
[0049] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model. It should be noted that the structures or components illustrated in the drawings are not necessarily drawn to scale, and the utility model omits the description of known components and processing technologies and processes to avoid unnecessary limitations on the utility model.
Claims
1. A dry gas sealing structure for sway resistance and strong corrosion conditions, comprising a medium-side dry gas sealing mechanism and an atmosphere-side dry gas sealing mechanism installed on a central axis device (1), wherein a sleeve assembly is arranged between the medium-side dry gas sealing mechanism and the central axis device (1) and between the atmosphere-side dry gas sealing mechanism, and characterized in that: The medium-side dry gas sealing mechanism comprises a medium-side dynamic ring assembly and a medium-side static ring assembly, and the atmosphere-side dry gas sealing mechanism comprises an atmosphere-side dynamic ring assembly and an atmosphere-side static ring assembly; The medium side dynamic ring assembly and the atmosphere side dynamic ring assembly can rotate along with the central axis device (1); The medium-side dynamic ring assembly comprises a medium-side dynamic ring (2) and a medium-side dynamic ring seat (3); the medium-side static ring assembly comprises a medium-side static ring (4) and a medium-side static ring seat (5); an air film can be formed between the medium-side dynamic ring (2) and the medium-side static ring (4); the atmosphere-side dynamic ring assembly comprises an atmosphere-side dynamic ring (6) and an atmosphere-side dynamic ring seat (7); the atmosphere-side static ring assembly comprises an atmosphere-side static ring (8) and an atmosphere-side static ring seat (9); an air film can be formed between the atmosphere-side dynamic ring (6) and the atmosphere-side static ring (8); The medium-side stationary ring seat (5) and / or the atmosphere-side stationary ring seat (9) are connected to a bellows (10), one end of the bellows (10) is connected to the medium-side stationary ring seat (5) and / or the atmosphere-side stationary ring seat (9), and the other end is connected to a stationary part of the central axis device (1).
2. The dry gas sealing structure for anti-deflection and strong corrosion conditions according to claim 1 is characterized in that: The medium-side stationary ring assembly and / or the atmosphere-side stationary ring assembly are connected to the central axis device (1) via a bearing (11).
3. The dry gas sealing structure for anti-deflection and strong corrosion conditions according to claim 1 is characterized in that: A first spring (12) is installed in the atmosphere side dynamic ring seat (7). When the first spring (12) is in a free state, the atmosphere side dynamic ring (6) fits with the atmosphere side static ring (8). A second spring (13) is installed in the medium side static ring seat (5). When the second spring (13) is in a free state, the medium side static ring (4) fits with the medium side dynamic ring (2).
4. The dry gas sealing structure for anti-deflection and strong corrosion conditions according to claim 1 is characterized in that: The shaft sleeve assembly comprises a medium side shaft sleeve (14) and an atmosphere side shaft sleeve (15), wherein the medium side shaft sleeve (14) is arranged in axial contact with the atmosphere side shaft sleeve (15), and a first anti-rotation pin (16) is arranged between the medium side shaft sleeve (14), the medium side dynamic ring (2), and the atmosphere side dynamic ring seat (7), and all of them can rotate with the central axis device (1), and the atmosphere side dynamic ring (6) can rotate with the atmosphere side dynamic ring seat (7).
5. The dry gas sealing structure for anti-deflection and strong corrosion conditions according to claim 2 is characterized in that: The bearing (11) is provided with a bearing seat (17), the atmosphere side of the bearing seat (17) is provided with a pressure cover (18), the medium side next to the bearing seat (17) is an atmosphere side static ring seat (9), the medium side static ring seat (5) is provided on the atmosphere side of the medium side dynamic ring (2), and the pressure cover (18), the bearing seat (17), the atmosphere side static ring seat (9) and the medium side static ring seat (5) are connected together via studs (19).
6. The anti-deflection and strong corrosion dry gas sealing structure according to claim 5 is characterized in that: The two ends of the bellows (10) are respectively provided with a first bellows gland (22) and a second bellows gland (23); the first bellows gland (22) is fitted with the medium-side stationary ring seat (5); the second bellows gland (23) is connected to the stationary part of the central axis device (1); the medium-side stationary ring seat (5) is connected in series with the first bellows gland (22) and the second bellows gland (23) via a second anti-rotation pin (20).
7. The anti-deflection and strong corrosion dry gas sealing structure according to claim 1 is characterized in that: A lip-shaped sealing structure (21) is provided on the medium-side end surface of the medium-side dry gas sealing structure.
8. The anti-deflection and strong corrosion dry gas sealing structure according to claim 7 is characterized in that: The lip-shaped sealing structure (21) is made of plastic.
9. The anti-deflection and strong corrosion dry gas sealing structure according to claim 1 is characterized in that: The medium-side end surface of the medium-side stationary ring seat (5) is made of silicon carbide, and the shaft sleeve assembly is made of silicon carbide.
10. The anti-deflection and strong corrosion dry gas sealing structure according to claim 1 is characterized in that: The corrugated pipe (10) is made of ethylene propylene rubber.