Energized piston seal ring

Abstract

An energized piston seal ring, which relates to a piston seal ring which is expanded by medium pressure in hydraulic cylinders and pneumatic cylinders. Its main feature is that the seal ring is an annular flexible body, and its axial section is formed by It is a semi-closed structure composed of the diameter surface, the left and right end surfaces and the tapered inner sleeve connected to the left end surface. There is an annular stepped groove at the outer diameter of the end face connected to the tapered inner sleeve, and the other end face is uniformly distributed with axially penetrating small holes, and the outer side of the end face has radial grooves that penetrate radially The groove and the small hole correspond to intersect and communicate with each other, and the outer diameter surface of the sealing ring is an arc surface protruding outward. There are three sealing surfaces: the outer diameter surface of the sealing ring, the outer end surface of the stepped groove side of the sealing ring and the inner surface of the tapered inner sleeve of the sealing ring. It has the advantages of fewer sealing parts, simple structure, low cost, small frictional resistance, reliable high and low pressure sealing performance, can be used in defective cylinders, and has low requirements on the sealing surface of cylinders.

Description

technical field [0001] The invention relates to a dynamic seal ring for pistons used in hydraulic cylinders and pneumatic cylinders in industries such as machinery, coal mines, and metallurgy, and in particular to a piston seal ring that expands from inside to outside by medium pressure. Background technique [0002] At present, the piston dynamic seals in the known hydraulic cylinders or pneumatic cylinders all rely on the deformation of the sealing ring to squeeze the sealing cylinder to complete the sealing function. The sealing principle is the same for all kinds of sealing rings introduced in the "New Hydraulic Engineering Handbook" published in 1998. A "self-service variable diameter reciprocating sealing device" is provided in the Chinese utility model patent specification CN2165290U, and the sealing reliability is greatly improved, but through practice verification, this kind of sealing ring has its own deficiencies: 1. Excessive frictional resistance Large, often e...

AI Technical Summary

Problems solved by technology

A "self-service variable diameter reciprocating sealing device" is provided in the Chinese utility model patent specification CN2165290U, and the sealing reliability is greatly improved, but through practice verification, this kind of sealing ring has its own deficiencies: 1. Excessive frictional resistance Large, often exceeding the frictional resistance specified in the national standard; 2. The sealing device has a large number of parts and a complex structure. Compared with the traditional sealing ring, one sealing part has three more parts; 3. The cost is high, due to the large number of parts There are many and the parts are more complicated, so the sealing cost is higher

In order to achieve the conditions for establishing a seal, an axial support ring must be installed in the sealing ring to transmit the axial force. The support ring must also have radial through holes, and the piston body must also be made to communicate with the pressure medium. In this way, a complete sealing system is formed; the disadvantages are: the sealing device needs more parts, and the problem of high cost has not been solved, and the large-scale promotion has been affected to a certain extent.

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