A static and dynamic composite sealing structure and method for rotating machinery rotor
A composite seal and rotor technology, applied in the direction of engine seals, mechanical equipment, engine components, etc., can solve the problems of limited use, poor economical use, etc., reduce temperature rise, avoid short circuit or corrosion, and improve sealing effect Effect
Active Publication Date: 2017-07-14
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology
When the rotor speed is high, the use of contact seals will be limited due to relatively large friction and wear
Method used
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Embodiment Construction
[0021] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:
[0022] Such as figure 1 As shown, the two ends of the sliding bearing are provided with a left annular oil return groove 5 and a right annular oil return groove 11, and a left lip seal ring 4 and a right lip seal ring are arranged on the outer sides of the left annular oil return groove 5 and the right annular oil return groove 11 respectively. 12. On the outside of the left lip seal ring 4 and the right lip seal ring 12, there are left slit annular air pressure chamber 3, right slit annular air pressure chamber 14, left slit annular air pressure chamber 3, and right slit annular air pressure chamber 14 is connected with the external high-pressure air source by air inlet. Before the rotor is started, the left lip seal ring 4 and the right lip seal ring 12 are tightly attached to the rotor to prevent the lubricating fluid flowing out from the bearing gap from flo...
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The invention relates to a static and dynamic composite sealing structure and method for a rotary machine rotor. In the stage of adding high-pressure lubricating fluid to the sliding bearing to make the rotor float and in the stage of low-speed rotation of the rotor, the lip shape attached to the rotor by the tip of the lip The static sealing effect of the sealing ring prevents the leakage of lubricating fluid. As the rotor speed increases, open the intake channel of the external high-pressure air source and gradually increase the air pressure, so that the lip tip of the lip seal ring is separated from the rotor surface and forms an annular gas wall on the rotor surface. Most of the lubricating fluid is due to centrifugal action It is thrown into the left and right annular oil return grooves to flow out, and a small part of the lubricating fluid flowing along the axial direction of the rotor is restricted by the seal of the floating lip tip and the dynamic seal of the gas wall. This ensures that the rotor is well sealed throughout the full speed range of start-stop and rotation.
Description
technical field [0001] The invention belongs to the field of sealing, and in particular relates to a static and dynamic composite sealing structure and method for a rotary machine rotor. Background technique [0002] Seals are generally divided into two types: static seals and dynamic seals, and each seal type has a variety of sealing methods. Static seals, such as O-ring seals, are often used between the two static surfaces of the rotor. This type of seal is safe, reliable, simple and economical, and has low structural requirements. However, for the sealing of the moving surface, especially under high-speed conditions, the static seal is easy to wear, and the service life is greatly reduced, which cannot meet the requirements of use. Dynamic seals include labyrinth seals, centrifugal seals, spiral seals, magnetic seals, air pressure seals, etc., and the usage occasions of each sealing method are different. Labyrinth seals, air pressure seals and centrifugal seals are rela...
Claims
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IPC IPC(8): F16J15/16F16J15/40
Inventor 王琳张瑜
Owner NORTHWESTERN POLYTECHNICAL UNIV