A rotary joint

By employing a micro-annular gap and fluid lubrication film design in the rotary joint, combined with multi-stage sealing, the problems of rotary joint wear and leakage are solved, achieving a rotary joint design with high-efficiency sealing and low power consumption.

CN224516228UActive Publication Date: 2026-07-17VIAIKAI LINEAR (SUZHOU) TECHNOLOGY CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
VIAIKAI LINEAR (SUZHOU) TECHNOLOGY CO LTD
Filing Date
2025-07-22
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

In existing rotary joints, the sealing structure between the rotating and stationary parts is prone to fluid leakage due to wear, resulting in a short service life. Furthermore, hard contact seals increase frictional resistance and power consumption.

Method used

By forming an extremely small annular gap between the shaft and the bearing sleeve, utilizing a Babbitt alloy filler sleeve and a double bearing structure, a fluid lubrication film is used to replace the hard contact seal, combined with a multi-stage sealing design to achieve a non-contact seal.

Benefits of technology

It reduces wear on rotating and stationary parts, extends the service life of rotary joints, reduces power consumption and maintenance costs, and avoids fluid leakage and environmental pollution.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN224516228U_ABST
    Figure CN224516228U_ABST
Patent Text Reader

Abstract

The utility model discloses a swivel joint belongs to mechanical engineering sealing technical field. In view of the existing swivel joint because of hard contact seal leads to serious wear and tear, leakage failure and high power consumption higher problem, this swivel joint includes setting first set body of liquid inlet and first flow channel, with the bearing cover of first set body screw thread connection and is equipped with liquid seepage mouth, the rotating shaft that passes through bearing rotation cooperation and the filling sleeve that is fixed in the bearing cover. Filling sleeve and rotating shaft form second annular cylindrical gap, with hollow chamber, annular flow channel intercommunication, cooperate framework sealing ring, first sealing ring constitutes multistage sealing structure, reduces friction wear and tear. The design effectively improves sealing reliability, prolongs the life, reduces the maintenance cost, is applicable to high pressure high -speed working condition.
Need to check novelty before this filing date? Find Prior Art

Claims

1. A rotary joint, characterized by include: The first set of body is provided with a liquid inlet and a first flow channel with one end communicating with the liquid inlet is provided inside the first set of body; A bearing sleeve is threadedly connected to the first sleeve body. The bearing sleeve is provided with a seepage port, which is used to communicate with a liquid collection tank through a drain pipe. A rotating shaft is rotatably coupled to a bearing sleeve via a bearing. A hollow cavity is formed between the bearing sleeve, the rotating shaft, and the first sleeve body. A second flow channel is provided in the rotating shaft. The other end of the first flow channel and one end of the second flow channel are respectively connected to the hollow cavity. The other end of the second flow channel serves as a liquid outlet. An annular flow channel and a first annular cylindrical gap with one end connected to the annular flow channel are formed between the rotating shaft and the bearing sleeve. The annular flow channel is connected to the liquid outlet. A skeleton sealing ring coaxial with the rotating shaft is also fixed inside the bearing sleeve. A filling sleeve is fixed inside the bearing sleeve and is coaxial with the rotating shaft. A second annular cylindrical gap is formed between the filling sleeve and the rotating shaft. One end of the second annular cylindrical gap communicates with the hollow cavity and the other end communicates with the annular flow channel. The second annular cylindrical gap, the annular flow channel, the first annular cylindrical gap, the skeleton sealing ring, and the bearing are sequentially moved away from the hollow cavity.

2. The rotary joint of claim 1, wherein: A second sealing ring is sandwiched between the bearing sleeve and the first sleeve body.

3. The rotary joint of claim 1, wherein: The filling sleeve is made of Babbitt alloy, and the bearing sleeve is made of copper or aluminum.

4. The rotary joint of claim 1, wherein: The diameter of the second annular cylindrical gap is 2μm to 3μm.

5. The rotary joint of claim 1, wherein: There are two bearings, namely a first bearing and a second bearing. The first bearing and the second bearing are distributed at an axial distance along the shaft, and the second bearing is farther away from the hollow cavity than the first bearing.

6. The rotary joint of claim 5, wherein: It also includes an inner spacer and an outer spacer respectively disposed between the first bearing and the second bearing, the rotating shaft, the inner spacer and the outer spacer are coaxial, and the first bearing, the second bearing, the inner spacer and the outer spacer form a rotating assembly.

7. The rotary joint of claim 6, wherein: It also includes a pressure cap and a shaft retaining ring disposed on the rotating shaft. The pressure cap is connected to the end of the bearing sleeve away from the first sleeve body by screws. The rotating assembly is located between the shaft retaining ring and the pressure cap, and the shaft retaining ring and the pressure cap axially limit the rotating assembly.

8. The rotary joint of claim 7, wherein: The pressure cap is provided with a through hole corresponding to the rotating shaft, and the end of the rotating shaft away from the hollow cavity extends out of the bearing sleeve and passes through the through hole.

9. The rotary joint according to claim 8, characterized in that: The end of the rotating shaft away from the hollow cavity is also fitted with a first sealing ring.