A floating sealing structure for a high-speed rotary joint
By adopting a floating structure with separate dynamic and static sealing rings in the high-speed rotary joint, the problem of excessive heat generation during medium-free transport is solved, and effective sealing is achieved during medium transport, thereby improving the operational stability and production continuity of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUXI BOHUA ELECTROMECHANICAL CO LTD
- Filing Date
- 2025-07-29
- Publication Date
- 2026-07-03
AI Technical Summary
Existing high-speed rotary joints cause excessive heat due to friction of the seals when there is no medium being transported, which affects production.
The system employs separate dynamic and static sealing rings, designed as a floating structure. When no medium is being transported, the dynamic and static sealing rings are separated by a reset unit to avoid friction. During medium transport, the high-pressure medium pushes the floating hollow shaft to bring the dynamic and static sealing rings into contact and seal.
This effectively avoids excessive heat generation during medium-free transport, improves equipment operational stability and production continuity, and reduces the frequency of downtime for heat dissipation.
Smart Images
Figure CN224454046U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to joint sealing technology, specifically a floating sealing structure for a high-speed rotary joint. Background Technology
[0002] A rotary joint is a sealed rotary connector that rotates 360° to transport media. The function of a rotary joint is to introduce liquid from one side of a pipeline into rotating or reciprocating equipment. A rotary joint generally consists of a rotating part, a stationary part, and a seal located at the end of the rotating part.
[0003] However, the seals of existing high-speed rotary joints are in constant contact with the stationary part. The high-speed rotating part causes friction between the seals and the stationary part, resulting in intense heat generation. When there is no medium being transported, the rotary joint is prone to overheating due to the lack of heat dissipation from the medium, requiring periodic shutdowns for heat dissipation, which affects normal production. Utility Model Content
[0004] To address the shortcomings of the prior art, this invention provides a floating sealing structure for a high-speed rotary joint, which consists of a dynamic sealing ring and a static sealing ring. This allows the dynamic and static sealing rings to be separated when there is no medium being transported, preventing them from contacting each other and causing friction, thus avoiding excessive heat generation.
[0005] To achieve the above technical objectives, this utility model adopts the following technical solution: a floating sealing structure for a high-speed rotary joint, comprising a rear cover, a front cover, and a sleeve. The rear cover and the front cover are respectively fixed to both ends of the sleeve. The rear cover, the front cover, and the sleeve cooperate to form an installation cavity. A medium inlet is provided at the end of the front cover away from the rear cover. A rotating hollow shaft is rotatably connected inside the installation cavity. A telescopic cavity is provided at the end of the front cover facing the rear cover. A floating hollow shaft is slidably fitted inside the telescopic cavity. A static sealing ring is provided at the end of the floating hollow shaft facing the rotating hollow shaft. A dynamic sealing ring is provided at the end of the rotating hollow shaft facing the floating hollow shaft. A reset unit is provided at the front cover. The reset unit separates the static sealing ring from the dynamic sealing ring. The floating hollow shaft and the rotating hollow shaft are coaxially arranged.
[0006] Preferably, the floating hollow shaft has a convex ring on its outer periphery, the reset unit includes a fixing pin and a spring, the fixing pin passes through the front cover, the end of the fixing pin is threadedly fixed to the convex ring, the spring is sleeved on the fixing pin, the end of the fixing pin away from the convex ring has a convex plate, and the spring is located between the front cover and the convex plate.
[0007] Preferably, the rotating hollow shaft is fitted with a plurality of angular contact ball bearings, and the outer wall of the angular contact ball bearings is clearance-fitted with the inner wall of the sleeve.
[0008] Preferably, the rotating hollow shaft is provided with a labyrinth seal at the end facing the medium inlet, and the labyrinth seal is fixed to the inner wall of the sleeve.
[0009] Preferably, both the dynamic sealing ring and the static sealing ring are silicon carbide sealing rings.
[0010] Preferably, the sleeve is provided with a leakage port, which communicates with the installation cavity.
[0011] Preferably, both the inner wall of the rotating hollow shaft and the outer wall of the floating hollow shaft are provided with sealing rings.
[0012] In summary, this utility model achieves the following technical effects:
[0013] The floating sealing structure of the high-speed rotary joint of this utility model adopts a separate dynamic sealing ring and a static sealing ring. When there is no medium being transported, the dynamic sealing ring and the static sealing ring can be separated to avoid friction caused by contact between the dynamic sealing ring and the static sealing ring, thus avoiding excessive heat generation. When transporting medium, the high-pressure medium will overcome the spring force and push the floating hollow shaft to move until the dynamic sealing ring and the static sealing ring are in contact and rotate to seal. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the internal structure of the floating sealing structure of the high-speed rotary joint of this utility model.
[0015] Explanation of reference numerals in the accompanying drawings: 1. Sleeve; 2. Rear cover; 3. Front cover; 4. Rotating hollow shaft; 5. Angular contact ball bearing; 6. Mounting cavity; 7. Labyrinth seal; 8. Dynamic sealing ring; 9. Leakage port; 10. Floating hollow shaft; 11. Static sealing ring; 12. Fixed pin; 13. Spring; 14. Medium inlet; 15. Sealing ring. Detailed Implementation
[0016] The present invention will be further described in detail below with reference to the accompanying drawings.
[0017] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.
[0018] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0019] Furthermore, 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 technical features indicated. Thus, 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, "a plurality of" means two or more, unless otherwise explicitly specified.
[0020] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between 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.
[0021] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0022] Example 1:
[0023] like Figure 1As shown, a floating sealing structure for a high-speed rotary joint includes a rear cover 2, a front cover 3, and a sleeve 1. The rear cover 2 and the front cover 3 are respectively fixed to both ends of the sleeve 1. The rear cover 2, the front cover 3, and the sleeve 1 cooperate to form an installation cavity 6. The front cover 3 has a medium inlet 14 at the end away from the rear cover 2. A rotating hollow shaft 4 is rotatably connected inside the installation cavity 6. The front cover 3 has a telescopic cavity at the end facing the rear cover 2. A floating hollow shaft 10 is slidably fitted inside the telescopic cavity. A static sealing ring 11 is provided at the end of the floating hollow shaft 10 facing the rotating hollow shaft 4. A dynamic sealing ring 8 is provided at the end of the rotating hollow shaft 4 facing the floating hollow shaft 10. The front cover 3 has a reset unit, which separates the static sealing ring 11 from the dynamic sealing ring 8. The floating hollow shaft 10 and the rotating hollow shaft 4 are coaxially arranged.
[0024] The floating sealing structure of the high-speed rotary joint in this embodiment employs a separate dynamic sealing ring 8 and a static sealing ring 11. This allows the dynamic sealing ring 8 and static sealing ring 11 to separate when no medium is being transported, preventing contact and friction between them and avoiding excessive heat generation. Furthermore, when transporting medium, the high-pressure medium overcomes the force of the spring 13, pushing the floating hollow shaft 10 until the dynamic sealing ring 8 and static sealing ring 11 come into contact and rotate to seal.
[0025] The floating hollow shaft 10 has a convex ring on its outer periphery. The reset unit includes a fixing pin 12 and a spring 13. The fixing pin 12 passes through the front cover 3. The end of the fixing pin 12 is threadedly fixed to the convex ring. The spring 13 is sleeved on the fixing pin 12. The end of the fixing pin 12 away from the convex ring has a convex plate. The spring 13 is located between the front cover 3 and the convex plate.
[0026] The rotating hollow shaft 4 is fitted with several angular contact ball bearings 5, and the outer wall of the angular contact ball bearing 5 is clearance-fitted with the inner wall of the sleeve 1.
[0027] The rotating hollow shaft 4 is provided with a labyrinth seal 7 at the end facing the medium inlet 14. The labyrinth seal 7 is fixed to the inner wall of the sleeve 1. The labyrinth seal 7 can prevent leaked medium from entering the angular contact ball bearing 5 and prevent the angular contact ball bearing 5 from corroding.
[0028] Both the dynamic sealing ring 8 and the static sealing ring 11 are silicon carbide sealing rings.
[0029] The sleeve 1 is provided with a leakage port 9, which is connected to the mounting cavity 6. When the dynamic sealing ring 8 and the static sealing ring 11 come close to each other, there will be a certain amount of time, which will cause the high pressure medium to enter the mounting cavity 6. The setting of the leakage port 9 can guide this part of the leaked high pressure medium to be discharged.
[0030] Both the inner wall of the rotating hollow shaft 4 and the outer wall of the floating hollow shaft 10 are provided with sealing rings 15. The rotating hollow shaft 4 is connected to the rotating equipment, and the floating hollow shaft 10 will move. Therefore, the setting of sealing rings 15 can improve the sealing performance between the rotating hollow shaft 4 and the rotating equipment and between the floating hollow shaft 10 and the front cover 3.
[0031] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall fall within the scope of the technical solution of the present utility model.
Claims
1. A floating seal structure of a high-speed rotary joint, characterized by, The device includes a rear cover, a front cover, and a sleeve. The rear cover and the front cover are fixed to both ends of the sleeve, and the rear cover, the front cover, and the sleeve cooperate to form an installation cavity. The front cover has a medium inlet at the end away from the rear cover. A rotating hollow shaft is rotatably connected inside the installation cavity. The front cover has a telescopic cavity at the end facing the rear cover, and a floating hollow shaft is slidably fitted inside the telescopic cavity. The floating hollow shaft has a static sealing ring at the end facing the rotating hollow shaft, and a dynamic sealing ring at the end facing the floating hollow shaft. The front cover has a reset unit that separates the static sealing ring from the dynamic sealing ring. The floating hollow shaft and the rotating hollow shaft are coaxially arranged.
2. A floating seal structure for a high-speed rotary joint according to claim 1, wherein The floating hollow shaft has a convex ring on its outer periphery. The reset unit includes a fixing pin and a spring. The fixing pin passes through the front cover. The end of the fixing pin is threadedly fixed to the convex ring. The spring is sleeved on the fixing pin. The end of the fixing pin away from the convex ring has a convex plate. The spring is located between the front cover and the convex plate.
3. A floating seal structure for a high-speed rotary joint according to claim 1, wherein The rotating hollow shaft is fitted with several angular contact ball bearings, and the outer wall of the angular contact ball bearings is clearance-fitted with the inner wall of the sleeve.
4. A floating seal structure for a high-speed rotary joint according to claim 1, wherein The rotating hollow shaft is provided with a labyrinth seal at the end facing the medium inlet, and the labyrinth seal is fixed to the inner wall of the sleeve.
5. A floating seal structure for a high speed rotary union as defined in claim 1, wherein Both the dynamic sealing ring and the static sealing ring are silicon carbide sealing rings.
6. A floating seal structure for a high-speed rotary joint according to claim 1, wherein The sleeve is provided with a leakage port, which is connected to the installation cavity.
7. A floating seal structure for a high-speed rotary joint according to claim 1, wherein Both the inner wall of the rotating hollow shaft and the outer wall of the floating hollow shaft are equipped with sealing rings.