Single-end-face dry operation sealing structure for top stirring
By designing a single-end dry-running sealing structure for top agitation, the problem of process media directly leaking into the atmosphere was solved, achieving a high-efficiency, safe, and low-cost sealing effect.
Patent Information
- Application Number
- CN202520289167.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-21
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-02-21
AI Technical Summary
Existing stirred tank sealing structures pose a risk of process media leaking directly into the atmosphere, and are also costly, affecting product quality and causing environmental pollution.
Design a single-end dry-running sealing structure for top agitation, including a bushing, sealing seat, bearing seat, spring seat, dynamic ring, and stationary ring. Collect leaked process gas through an exhaust channel and recover or safely discharge it to avoid direct leakage.
It effectively prevents process media from leaking directly into the atmosphere, reduces costs, improves the reliability and safety of the sealing structure, and reduces environmental pollution.
Smart Images
Figure CN223895027U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of sealing technology, specifically to a single-end dry-running sealing structure for top stirring. Background Technology
[0002] Agitated reactors are key equipment in the chemical industry, and the sealing structure is a core component of these reactors. The sealing structure is installed at the top of the reactor body, through which the rotating shaft used for agitation passes and enters the reactor body for stirring. The sealing structure prevents the exchange of the medium inside the reactor with external air and impurities, preventing the leakage of harmful media and also preventing atmospheric air and other substances from entering the reactor. Currently, the main types of agitated reactor seals include packing seals, mechanical seals, dry gas seals, and dry-run seals.
[0003] Packing seals are gradually being phased out due to their short service life, large leakage, and high wear and tear.
[0004] Mechanical seals have a wide range of applications, including extensive use in stirred tanks. However, mechanical seals require a sealing fluid (water or oil) to cool the sealing end face, and a dedicated control system is needed to circulate the sealing fluid. This results in relatively high costs and the system requires regular replenishment and maintenance. Additionally, a small amount of sealing fluid may enter the stirred tank, affecting the composition of the process medium.
[0005] Dry gas seals are non-contact seals. During operation, an air film exists between the end faces of the moving and stationary rings to prevent contact wear. Therefore, dry gas seals do not generate heat and do not require cooling fluid. However, dry gas seals require a stable, clean, and dry gas to provide the air film to the sealing end faces. Process media often do not provide this, so most dry gas seals use external inert gases (usually nitrogen) as the sealing gas, requiring a dedicated control system, which increases costs. Furthermore, to prevent leakage of the sealing gas into the atmosphere, dry gas seals must be designed with a double-end-face structure, which also increases costs and limits their practical application.
[0006] Dry-run seals are contact seals, meaning they are not cooled by a sealing fluid. They are suitable for low-speed applications such as stirred tanks. However, to ensure the seal's lifespan, the dynamic and static ring materials of dry-run seals mostly contain graphite, which has good self-lubricating properties. During contact wear, graphite powder inevitably wears out and enters the process medium, affecting product quality. Furthermore, most dry-run seals currently used in the field are single-end dry-run seals, meaning the medium leaks directly into the atmosphere, posing a significant risk. Utility Model Content
[0007] This invention provides a single-end dry-running sealing structure for top stirring, the purpose of which is to prevent the process medium from leaking directly into the atmosphere during operation.
[0008] This utility model is achieved through the following technical solution: a single-end dry-running sealing structure for top stirring, comprising:
[0009] A bushing is fixedly connected to the rotating shaft of the mixing vessel, and the bushing and the rotating shaft are sealed together.
[0010] A sealing seat is connected to the top of the tank body of the mixing vessel, and the sealing seat and the tank body are sealed together. The sealing seat has a sealing cavity inside.
[0011] A bearing housing, in which a bearing is installed, and a bushing is coaxially connected to the bearing; the bearing housing and the sealing seat are sealed together and the bearing housing and the bushing are sealed together; an exhaust channel is provided on the bearing housing, one end of the exhaust channel is connected to the sealing cavity, and the other end of the exhaust channel passes through the outside of the bearing housing;
[0012] A spring seat is coaxially fixed on the bushing, and the spring seat and the bushing are sealed together. The spring seat has an annular cavity inside.
[0013] A moving ring is located inside the annular cavity of the spring seat. The inner side of the moving ring is sealed to the annular cavity of the spring seat. A spring is provided between the top end of the moving ring and the top wall of the annular cavity of the spring seat.
[0014] A stationary ring is fixed inside the sealing cavity of the sealing seat, and the stationary ring is sealed to the sealing cavity. The stationary ring is located at the bottom end of the rotating ring.
[0015] Furthermore, a push ring is provided at the top of the moving ring, and the spring is located between the push ring and the top wall of the annular cavity of the spring seat.
[0016] Furthermore, the spring is provided in multiple forms, and the multiple springs are evenly distributed along the circumference of the moving ring.
[0017] Furthermore, a clamping sleeve C is coaxially connected to the upper part of the bushing. A clamping sleeve A and a clamping sleeve B are coaxially sleeved on the outer side of the clamping sleeve C. The outer side of the clamping sleeve C has two mutually inclined slopes. The inner sides of the clamping sleeves A and B are respectively provided with slopes that cooperate with the two slopes on the outer side of the clamping sleeve C. A connecting piece is threaded between the clamping sleeves A and B. Tightening the connecting piece can cause the slopes of the clamping sleeves A and B to press against the two slopes of the clamping sleeve C, thereby causing the clamping sleeve C to radially hug the bushing.
[0018] Furthermore, a spring seat retaining ring is connected to the outer ring and lower part of the annular cavity of the spring seat; a step is provided on the outer side of the moving ring, and the step of the moving ring is located above the spring seat retaining ring.
[0019] Furthermore, a stationary ring retainer is installed inside the sealing cavity of the sealing seat, and the stationary ring retainer is located at the top of the stationary ring.
[0020] Furthermore, a bearing cover is connected to the top of the bearing housing, the bearing cover axially presses against the outer ring of the bearing, and the bearing cover and the bearing housing are sealed together. An elastic retaining ring for axial positioning of the inner ring of the bearing is connected to the outer side of the bushing, and the elastic retaining ring for axial positioning is located at the top of the inner ring of the bearing.
[0021] Furthermore, the bearing cover is provided with a positioning block, which is connected to the bearing cover, and one end of the positioning block is connected to the outer side of the bushing.
[0022] Furthermore, a bearing bracket is fixedly connected to the top of the bearing housing.
[0023] Furthermore, the bearing housing is provided with an oil injection channel, one end of which is a grease inlet, and the grease inlet is equipped with a grease cup. The other end of the oil injection channel is connected to the inner cavity of the bearing housing.
[0024] The bearing housing is provided with a grease injection and venting channel. One end of the grease injection and venting channel is a grease injection and venting port, and the other end of the grease injection and venting channel is connected to the inner cavity of the bearing housing. A plug is provided inside the grease injection and venting port.
[0025] Compared with the prior art, this utility model has the following advantages and beneficial effects:
[0026] In this invention, the rotating and stationary rings are paired. During low-speed operation, the small amount of heat generated by the friction between the rotating and stationary rings can quickly pass through the sealing cavity and diffuse rapidly through the exhaust channel on the bearing housing, preventing damage to the sealing end face due to a rapid temperature increase. Furthermore, process gas leaking from the seal will not directly diffuse into the atmosphere. A pipeline can be connected to one end of the exhaust channel to collect and recover the leaked process gas or guide it to a safe location for discharge and treatment, effectively avoiding the risk of process media directly leaking into the atmosphere during operation. Attached Figure Description
[0027] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:
[0028] Figure 1 This is a longitudinal cross-sectional view of an embodiment of a single-end dry-running sealing structure for top stirring according to the present invention.
[0029] Figure 2 This is a partial cross-sectional view of an embodiment of a single-end dry-running sealing structure for top stirring according to the present invention.
[0030] The attached diagram shows the markings and corresponding component names:
[0031] O-ring 1, O-ring 2, stationary ring 3, stationary ring retainer 4, rotating ring 5, O-ring 6, O-ring 7, O-ring 8, push ring 9, spring 10, spring seat 11, auxiliary seal 12, O-ring 13, grease cup 14, first skeleton oil seal 15, bearing seat 16, bearing 17, plug 18, second skeleton oil seal 19, O-ring 20, positioning block 21, cylindrical head screw 22, clamping sleeve A 23, clamping sleeve C2 4. Clamping sleeve B25, external hex bolt 26, cylindrical head screw 27, bearing cover 28, shaft elastic retaining ring 29, cylindrical head screw 30, flat washer 31, elastic washer 32, shaft sleeve 33, sealing seat 34, sealing cavity 340, set screw 35, cylindrical head screw 36, elastic washer 37, flat washer 38, spring seat retaining ring 39, stationary ring anti-rotation pin 40, bearing bracket 41, tank body 42, rotating shaft 43. Detailed Implementation
[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.
[0033] Example 1
[0034] like Figures 1-2 As shown, this embodiment 1 provides a single-end dry-running sealing structure for top stirring, comprising:
[0035] 1. Bushing 33, which is fixedly connected to the rotating shaft 43 of the mixing vessel, and the bushing 33 and the rotating shaft 43 are sealed together. Specifically: In this embodiment, a clamping sleeve C24 is coaxially connected to the upper part of the bushing 33. The upper part of the bushing 33 is provided with a step. The clamping sleeve C24 is coaxially mounted on the bushing 33 and, under the action of the step on the upper part of the bushing 33, limits the axial position of the clamping sleeve.
[0036] The outer coaxial sleeve 33 of the clamping sleeve C24 is provided with clamping sleeve A23 and clamping sleeve B25. The outer side of the clamping sleeve C24 has two inclined surfaces that are inclined to each other, so that the longitudinal section of the clamping sleeve C24 has a V-shaped structure that is symmetrical on both sides. The inner sides of the clamping sleeve A23 and the clamping sleeve B25 are respectively provided with inclined surfaces that cooperate with the two inclined surfaces on the outer side of the clamping sleeve C24.
[0037] A connecting piece is threaded between clamping sleeve A23 and clamping sleeve B25. In this embodiment, the connecting piece is an external hexagonal bolt 26. Tightening the connecting piece allows the inclined surfaces of clamping sleeve A23 and clamping sleeve B25 to press against the two inclined surfaces of clamping sleeve C24, causing clamping sleeve C24 to radially grip the shaft sleeve 33, thereby achieving the purpose of gripping the rotating shaft 43. Specifically, clamping sleeve A23 is machined with multiple circumferentially evenly distributed threaded holes, and clamping sleeve B25 is machined with multiple circumferentially evenly distributed through holes. The threaded holes on clamping sleeve A23 and... The center distance of the through holes on clamping sleeve B25 is the same. After the external hex bolt 26 passes through the through hole on clamping sleeve B25, it is screwed into the threaded hole on clamping sleeve A23. When the external hex bolt 26 is tightened, clamping sleeve A23 and clamping sleeve B25 are pulled closer. The inclined surfaces of the inner holes of clamping sleeve A23 and clamping sleeve B25 press against the inclined surfaces of the outer diameter of clamping sleeve C24, causing clamping sleeve C24 to deform and shrink inward. This causes clamping sleeve C24 to radially hug the bushing 33, thereby causing the bushing 33 to also hug the rotating shaft 43 and rotate together with the rotating shaft 43.
[0038] In this embodiment, an O-ring 6 is provided between the lower part of the bushing 33 and the rotating shaft 43. The O-ring 6 can prevent the medium from leaking from the gap between the bushing 33 and the rotating shaft 43.
[0039] 2. Sealing seat 34, which is connected to the top of the tank body 42 of the mixing vessel and is sealed to the tank body 42. The sealing seat 34 has a sealing cavity 340 inside. In this embodiment, an O-ring 1 is provided between the bottom of the sealing seat 34 and the tank body 42. The O-ring 1 can prevent the medium from leaking from the gap between the sealing seat 34 and the tank body 42. In this embodiment, the sealing seat 34 and the tank body 42 are connected by a cylindrical head screw 36. An elastic washer 37 and a flat washer 38 are provided between the cylindrical head screw 36 and the sealing seat 34, so as to tightly fix the sealing seat 34 to the tank body 42.
[0040] 3. Bearing housing 16, bearing 17 is installed inside bearing housing 16, bushing 33 is coaxially connected to bearing 17. In this embodiment, bushing 33 and inner ring of bearing 17 are coaxially interference fit; bearing cover 28 is connected to the top of bearing housing 16, bearing cover 28 is fixedly connected to bearing housing 16 by cylindrical head screw 27, bearing cover 28 axially presses the outer ring of bearing 17, bearing cover 28 and bearing housing 16 are sealed together. In this embodiment, O-ring 20 is provided between bearing cover 28 and bearing housing 16. First skeleton oil seal 15 and second skeleton oil seal 19 are also installed inside bearing housing 16. First skeleton oil seal 15 and second skeleton oil seal 19 are located at the bottom and top of the inner cavity of bearing housing 16, respectively. First skeleton oil seal 15, second skeleton oil seal 19 and O-ring 20 can prevent lubricating oil from leaking out of bearing 17;
[0041] The outer side of the bushing 33 is connected to a shaft elastic retaining ring 29 for axial positioning of the inner ring of the bearing 17, and the shaft elastic retaining ring 29 is located at the top of the inner ring of the bearing 17. In this embodiment, an annular groove is provided on the outer side of the bushing 33, a part of the shaft elastic retaining ring 29 is inserted into the annular groove, and the other part of the shaft elastic retaining ring 29 is suspended at the top of the inner ring of the bearing 17; the bearing 17 can fix the radial position of all structural components in the sealing structure; the top of the bearing seat 16 is fixedly connected to a bearing bracket 41, which is used to fix and support the bearing and the equipment outside the sealing structure such as the motor and the reducer. The bearing bracket 41 and the bearing seat 16 are connected by a cylindrical head screw 30. A flat washer 31 and an elastic washer 32 are provided between the cylindrical head screw 30 and the bearing bracket 41. The cylindrical head screw 30 fixes the bearing seat 16 and the bearing bracket 41, thereby ensuring the stability of the bearing bracket 41 and other equipment above it;
[0042] In this embodiment, an oil injection channel is provided on the bearing housing 16. The oil injection channel is located at the lower part of the bearing housing 16. One end of the oil injection channel is a grease injection port G1, which is equipped with a grease cup 14. The other end of the oil injection channel is connected to the inner cavity of the bearing housing 16, so as to inject lubricating oil into the inner cavity of the bearing housing 16 to lubricate the bearing 17.
[0043] The bearing housing 16 is provided with a grease venting channel, which is located at the upper part of the bearing housing 16. One end of the grease venting channel is the grease venting port G2, and the other end of the grease venting channel is connected to the inner cavity of the bearing housing 16 to facilitate the venting of the bearing housing 16. A plug 18 is provided in the grease venting port G2.
[0044] The bearing housing 16 is sealed to the sealing seat 34 and to the bushing 33. Specifically, an O-ring 13 is provided between the bearing housing 16 and the sealing seat 34, and an auxiliary seal 12 is provided between the bearing housing 16 and the bushing 33. The auxiliary seal 12 can be a sealing ring or a sealing sleeve. An exhaust channel V is provided on the bearing housing 16. One end of the exhaust channel V is connected to the sealing cavity 340, and the other end of the exhaust channel V passes through the outside of the bearing housing 16. When the sealing gas leaks from between the sealing end faces, the auxiliary seal 12 and the O-ring 13 can confine the leaked gas to the space of the sealing cavity 340, and the leaked gas can only be discharged through the exhaust channel provided on the bearing housing 16. By connecting the pipeline at the exhaust channel, the leaked process gas can be collected or led to a safe place for discharge and treatment, thereby avoiding the process gas from directly leaking into the atmosphere and polluting the atmospheric environment.
[0045] 4. Spring seat 11, spring seat 11 is coaxially fixed on bushing 33, spring seat 11 and bushing 33 are sealed together. In this embodiment, spring seat 11 and bushing 33 are fixedly connected by set screw 35. O-ring 7 is provided between spring seat 11 and bushing 33. O-ring 7 can prevent the medium from leaking from the gap between bushing 33 and spring seat 11. Spring seat 11 is provided with an annular cavity inside.
[0046] 5. Moving ring 5, located inside the annular cavity of spring seat 11, with a sealed fit between the inner side of moving ring 5 and the annular cavity of spring seat 11. In this embodiment, an O-ring 8 is provided between the inner side of moving ring 5 and the annular cavity of spring seat 11. A spring 10 is provided between the top end of moving ring 5 and the top wall of the annular cavity of spring seat 11. In this embodiment, a push ring 9 is provided at the top end of moving ring 5. The spring 10 is located between the push ring 9 and the top wall of the annular cavity of spring seat 11. The push ring 9 and moving ring 5 are pressed together by the elastic force of the spring 10. Since the spring 10 is generally a metal part and the moving ring 5 is generally a non-metallic part, the push ring 9 added in this embodiment can protect the moving ring 5 and prevent the spring 10 from damaging the non-metallic moving ring 5 during the floating process. In this embodiment, multiple springs 10 are provided, and the multiple springs 10 are evenly distributed along the circumference of moving ring 5. The springs 10 provide floating compensation force for moving ring 5. The O-ring 8 can prevent the medium from leaking from the gap between moving ring 5 and spring seat 11.
[0047] In this embodiment, a spring seat retainer 39 is connected to the outer ring of the annular cavity of the spring seat 11 and located at its lower part. An annular groove is opened on the outer ring of the annular cavity of the spring seat 11. A part of the spring seat retainer 39 is inserted into the annular groove, and the other part of the spring seat retainer 39 is suspended. Steps are provided on both the outer and inner sides of the moving ring 5. The step on the outer side of the moving ring 5 is located above the spring seat retainer 39, and the step on the inner side of the moving ring 5 can match the shape of the inner ring of the spring seat 11. The spring seat retainer 39 placed on the spring seat 11 can be axially limited, so that the moving ring 5, the push ring 9, the spring 10 and the spring seat 11 can be assembled into an integral component for easy installation. During assembly, the spring seat retainer 39 can cooperate with the step of the moving ring 5 to axially limit the moving ring 5 and prevent the moving ring 5 from falling off.
[0048] 6. Stationary ring 3, stationary ring 3 is fixed in the sealing cavity 340 of sealing seat 34. In this embodiment, a stationary ring anti-rotation pin 40 is inserted between stationary ring 3 and sealing seat 34. The stationary ring anti-rotation pin 40 can limit and fix stationary ring 3 to prevent stationary ring 3 from rotating.
[0049] The stationary ring 3 and the sealing cavity 340 are sealed together. In this embodiment, an O-ring 2 is provided between the stationary ring 3 and the sealing cavity 340. The O-ring 2 can prevent the medium from leaking from the gap between the stationary ring 3 and the sealing cavity 340. The stationary ring 3 is located at the bottom end of the moving ring 5. A stationary ring retainer 4 is installed in the sealing cavity 340 of the sealing seat 34. A retaining groove is opened in the sealing ring. A part of the stationary ring retainer 4 is inserted into the retaining groove, and the other part of the stationary ring retainer 4 is suspended and located at the top of the stationary ring 3. The stationary ring retainer 4 can restrict the axial displacement of the stationary ring 3.
[0050] Example 2
[0051] The difference between this embodiment and embodiment 1 is that: a positioning block 21 is provided on the bearing cover 28, and the positioning block 21 is connected and fixed to the bearing cover 28 by a cylindrical head screw 22. One end of the positioning block 21 is connected to the outside of the bushing 33. In this embodiment, a groove is provided on the outside of the bushing 33, and one end of the positioning block 21 is inserted into the groove, which can limit the axial position of the components in the sealing structure.
[0052] Example 3
[0053] The difference between this embodiment and Embodiment 1 is that in this embodiment, the materials of the moving ring 5 and the stationary ring 3 include a combination of conventional silicon carbide, cemented carbide, and lightweight cemented carbide; conventional metal materials, including high-speed steel and other steels for different purposes, can also be used. In practice, different base materials can be selected according to different application environments. In this embodiment, both the sealing moving ring 5 and the stationary ring 3 are rigid materials, and no graphite powder contaminants will be generated during sealing operation.
[0054] The outer surfaces of the rotating ring 5 and the stationary ring 3 are coated with a special material, such as a DLC coating material. Coating the outer surfaces of the rotating ring 5 and the stationary ring 3 with a performance-enhancing material can strengthen the surface characteristics of the parts, such as increasing the hardness of the sealing end face, improving wear resistance, and reducing the coefficient of friction of the sealing end face.
[0055] It should be noted that the above description of the disclosed embodiments enables those skilled in the art to implement or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
[0056] In the description of this utility model, it should be noted that the terms "first", "second", "third", etc. are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.
[0057] In the description of this document, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the attached drawings. They are only used to describe the relative positional relationship between the components or parts and do not specifically limit the specific installation orientation of each component or part.
[0058] In the description of this document, some terms may be used to indicate not only orientation or positional relationship, but also other meanings. For example, the term "above" may also be used in some cases to indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances.
[0059] In the description of this document, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0060] The structures, proportions, sizes, etc., drawn in the accompanying drawings in this application are only used to complement the content disclosed in this technical disclosure for those skilled in the art to understand and read, and are not intended to limit the implementation conditions of this application. Therefore, they have no substantial technical significance. Any modification of the structure, change of the proportion relationship, or adjustment of the size shall still fall within the scope of the technical content disclosed in this application, provided that it does not affect the effect and purpose that this application can produce.
[0061] The terminology used in this document is that which is currently widely used in the art in consideration of the functionality of this disclosure; however, these terms may vary depending on the intent, precedent, or new technology of those skilled in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of this disclosure. Therefore, the terminology used in this document should not be construed as simple names, but rather based on the meaning of the terms and the overall description of this disclosure.
[0062] This document uses flowcharts or text to illustrate the operational steps performed according to embodiments of this application. It should be understood that the operational steps in the embodiments of this application are not necessarily performed precisely in the order described. Instead, as needed, various steps can be processed in reverse order or simultaneously. Furthermore, other operations can be added to these processes, or one or more operations can be removed from these processes.
[0063] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A single-end dry-running sealing structure for top stirring, characterized in that, include: A bushing is fixedly connected to the rotating shaft of the mixing vessel, and the bushing and the rotating shaft are sealed together. A sealing seat is connected to the top of the tank body of the mixing vessel, and the sealing seat and the tank body are sealed together. The sealing seat has a sealing cavity inside. A bearing housing, in which a bearing is installed, and a bushing is coaxially connected to the bearing; the bearing housing and the sealing seat are sealed together and the bearing housing and the bushing are sealed together; an exhaust channel is provided on the bearing housing, one end of the exhaust channel is connected to the sealing cavity, and the other end of the exhaust channel passes through the outside of the bearing housing; A spring seat is coaxially fixed on the bushing, and the spring seat and the bushing are sealed together. The spring seat has an annular cavity inside. A moving ring is located inside the annular cavity of the spring seat. The inner side of the moving ring is sealed to the annular cavity of the spring seat. A spring is provided between the top end of the moving ring and the top wall of the annular cavity of the spring seat. A stationary ring is fixed inside the sealing cavity of the sealing seat, and the stationary ring is sealed to the sealing cavity. The stationary ring is located at the bottom end of the rotating ring.
2. The single-end dry-running sealing structure for top stirring according to claim 1, characterized in that, The top of the moving ring is provided with a push ring, and the spring is located between the push ring and the top wall of the annular cavity of the spring seat.
3. The single-end dry-running sealing structure for top stirring according to claim 1, characterized in that, The spring is provided in multiple parts, and the multiple springs are evenly distributed along the circumference of the moving ring.
4. A single-end dry-running sealing structure for top stirring according to claim 1, characterized in that, The upper part of the bushing is coaxially connected to a clamping sleeve C. A clamping sleeve A and a clamping sleeve B are coaxially sleeved on the outer side of the clamping sleeve C. The outer side of the clamping sleeve C has two mutually inclined slopes. The inner sides of the clamping sleeves A and B are respectively provided with slopes that cooperate with the two slopes on the outer side of the clamping sleeve C. A connecting piece is threaded between the clamping sleeves A and B. Tightening the connecting piece can cause the slopes of the clamping sleeves A and B to press against the two slopes of the clamping sleeve C, thereby causing the clamping sleeve C to radially hug the bushing.
5. A single-end dry-running sealing structure for top stirring according to claim 1, characterized in that, A spring seat retaining ring is connected to the outer ring and lower part of the annular cavity of the spring seat; a step is provided on the outer side of the moving ring, and the step of the moving ring is located above the spring seat retaining ring.
6. A single-end dry-running sealing structure for top stirring according to claim 1, characterized in that, A stationary ring retainer is installed inside the sealing cavity of the sealing seat, and the stationary ring retainer is located at the top of the stationary ring.
7. A single-end dry-running sealing structure for top stirring according to claim 1, characterized in that, The bearing housing is connected to a bearing cover at its top end. The bearing cover axially presses against the outer ring of the bearing, and the bearing cover and the bearing housing are sealed together. The outer side of the bushing is connected to a shaft elastic retaining ring for axial positioning of the inner ring of the bearing. The shaft elastic retaining ring is located at the top end of the inner ring of the bearing.
8. A single-end dry-running sealing structure for top stirring according to claim 7, characterized in that, The bearing cover is provided with a positioning block, which is connected to the bearing cover, and one end of the positioning block is connected to the outer side of the bushing.
9. A single-end dry-running sealing structure for top stirring according to claim 1, characterized in that, A bearing bracket is fixedly connected to the top of the bearing housing.
10. A single-end dry-running sealing structure for top stirring according to any one of claims 1-9, characterized in that, The bearing housing is provided with an oil injection channel, one end of which is a grease inlet and a grease cup is provided on the grease inlet, and the other end of the oil injection channel is connected to the inner cavity of the bearing housing. The bearing housing is provided with a grease injection and venting channel. One end of the grease injection and venting channel is a grease injection and venting port, and the other end of the grease injection and venting channel is connected to the inner cavity of the bearing housing. A plug is provided inside the grease injection and venting port.