High-compressive hydraulic cylinder

Abstract

The invention discloses a high-compressive hydraulic cylinder and belongs to the technical field of sealing application in wind generator brakes. The high-compressive hydraulic cylinder comprises a U-shaped cylinder body. The inner wall of the cylinder body is provided with a bottom guide circular groove, a seal ring groove and a dust ring groove from bottom to top. A guide ring is embedded into the bottom guide circular groove. A seal ring is embedded into the seal ring groove. The seal ring is a Simrit seal ring. A second seal ring groove is arranged between the seal ring groove and the dust ring groove. A second seal ring is embedded into the second seal ring groove. Hydraulic pressure in the cylinder body drives, from the lower portion of the Simrit seal ring, the Simrit seal ring to form hermetic fit with the surface of a piston; when the hydraulic pressure breaks through the Simrit seal ring, the inverted-V-shaped structure of the second seal ring blocks the hydraulic pressure, drives the hydraulic pressure to react on the upper portion of the Simrit seal ring and downwardly drives the Simrit seal ring, and under the action of upper and lower hydraulic pressures, the Simrit seal ring forms a stable seal structure.

Description

technical field [0001] The invention belongs to the technical field of wind power generator brake seal application, and in particular relates to a high pressure-resistant hydraulic cylinder. Background technique [0002] A conventional hydraulic cylinder consists of an end face, a cylinder body, a piston rod, a piston and a sealing ring. The key technology is the sealing technology for the cylinder body. The dynamic sealing of the piston adopts O-rings, double-lip dust-proof rings and Y rings for a long time. Type ring and combined sealing element sealing technology. Among them, the O-ring structure has good extrusion resistance, and a large gap can be maintained between the piston rod and the inner wall of the piston chamber. This sealing structure has good dynamic and static sealing performance, small friction, no crawling, no sticking phenomenon, good wear resistance, stable size, not affected by temperature, has excellent buffering effect on strong impact pressure, and ...

AI Technical Summary

Problems solved by technology

Combined sealing elements are developed on the basis of O-rings, double-lip dust-proof rings and Y-rings in recent years. Dust ring plus Y-ring and other sealing rings, the sealing mechanism of the combined sealing element is basically the same as the sealing mechanism of elastic material seals such as O-ring, double-lip dust ring plus Y-ring, etc. There has always been a problem of medium leakage, and the sealing effect is also poor. It is not very ideal, and it cannot withstand high pressure; like O-rings, double-lip dust-proof rings and Y-rings, it will also appear unstable due to rigid material support rings; the existing hydraulic pressure The cylinder is prone to medium leakage, low reliability and stability, and short working life

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