Energized piston seal ring

Abstract

An energized piston seal ring features said seal ring being annular flexibility body, whose axial section being a semi enclosed construction composed of seal ring outside diameter surface, two ends surface and taper inside race connected with only one end surface. It contains annular ladder trough, axial direction perforated pin hole, radial perforated groove, groove intersection with pin hole and mutual passing through, seal ring outside diameter surface being outward raised cambered surface. It has three sealing surfaces, i.e. seal ring outside diameter surface, seal ring ladder trough outer end surface and seal ring taper inside race surface. Said invention has advantages of simple structure, cost, small frictional resistance, reliable high and low press sealing property, and capable of uses on defective cylinder etc.

Description

technical field [0001] The invention relates to a sealing ring used for dynamic sealing of pistons in hydraulic cylinders and pneumatic cylinders in industries such as machinery, coal mines and metallurgy. 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. Patent No. (93208491.5) provides a "self-service variable-diameter reciprocating sealing device", which greatly improves the sealing reliability, but through practice verification, this kind of sealing ring has its own shortcomings: 1. Excessive frictional resistance , often exceeding the frictional resistance specified in the national standard; 2. The sealing device has a large number of parts and a co...

AI Technical Summary

Problems solved by technology

Patent No. (93208491.5) provides a "self-service variable-diameter reciprocating sealing device", which greatly improves the sealing reliability, but it has been verified by practice that this kind of sealing ring has its own shortcomings: 1. Excessive frictional resistance , 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, there are three more parts in one sealing part; 3. The cost is high, due to the large number of parts. 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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