Ultra-high pressure sealed structure oil cylinder

Abstract

The invention relates to hydraulic oil cylinders, in particular to an ultra-high pressure sealed structure oil cylinder. The sealing problems of an ultra-high pressure oil cylinder or an oil cylinderwith large pressure fluctuations are solved. The ultra-high pressure sealed structure oil cylinder is composed of a cylinder body assembly and a piston rod assembly. The piston rod assembly is composed of a piston rod and a piston. The piston divides the internal space of the oil cylinder into a rod cavity and a rodless cavity. Valve core holes distributed symmetrically are formed in the outer round end surface of the rodless cavity side of the piston, wherein the valve core holes penetrates through the rod cavity. A left cone valve core and a right cone valve core are installed in the valve core holes, and the cone valve surfaces are compressed by springs. A through hole penetrating through the axis is formed in the bottom of a piston combined seal groove, the through hole is connected tothe two symmetrically distributed e valve core holes. A working principle is: when high pressure oil enters the rodless (rod) cavity of the oil cylinder, pressure oil opens the cone valve cores and acts on the bottom of the combined seal through the valve core holes and the through hole, the combined seal is compressed, and the compression amount of the combined seal is automatically adjusted according to the size of the oil pressure, so that the defects such as short life and large heat generation caused by high pre-compression of the high-pressure oil cylinder combined seal are overcome, and meanwhile, the fretting performance of the oil cylinder can be improved.

Description

technical field [0001] The invention relates to a hydraulic oil cylinder, in particular to an ultra-high pressure oil cylinder with a sealed structure. Background technique [0002] The common sealing structure is applied to the connection between the rod and the sleeve to prevent the fluid from leaking from the adjacent joint surfaces. At present, there are two types of seals in the cylinder, the static seal and the dynamic seal. The static seal is that the two joint surfaces will not O-rings are commonly used static seals when relative movement occurs. Dynamic seals require relative movement between the two joint surfaces. Lai ring, Y-shaped seal ring, combined seal ring, etc. [0003] Piston seal is a typical dynamic seal structure, and gray ring or combined seal ring is the most commonly used seal. However, this kind of seal must be pre-compressed in the process of use, so as to ensure the reliability of the seal. The greater the working pressure, the greater the pre-c...

AI Technical Summary

Problems solved by technology

[0003] Piston seal is a typical dynamic seal structure, and gray ring or combined seal ring is the most commonly used seal. However, this kind of seal must be pre-compressed in the process of use, so as to ensure the reliability of the seal. The greater the working pressure, the greater the pre-compression amount. For high-pressure oil cylinders, the excessive pre-compression amount not only affects the service life of the seal, but at the same time, due to the large pre-compression amount, the frictional resistance of the piston rod movement increases, seriously Affects the fretting performance of the cylinder

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