Hydraulic cylinder device with sealing gap adjusting structure

Abstract

The invention discloses a hydraulic cylinder device with a sealing gap adjusting structure, comprising a piston and a hydraulic cylinder body, wherein the interior of the piston is provided with a high-pressure adjusting cavity and a high-pressure ring cavity which are connected with each other, and the inner side of the high-pressure adjusting cavity is provided with an internal thread which is screwed with an external thread located at a bearing column in the interior of the high-pressure adjusting cavity; the excircle side of the high-pressure ring cavity is provided with a sealing ring groove in which an L-shaped sealing and an O-shaped sealing in the L-shaped sealing are arranged; and the interior of the bearing column is provided with a balance oil hole. When the hydraulic cylinder is under the effect of high-pressure oil, a high-strength wear-resisting layer of the sealing ring groove is tightly adhered to the inner wall of the cylinder body by the high-pressure ring cavity, and the high-strength wear-resisting layer synchronously expands and contracts along the expansion and contraction of the cylinder wall so as to strictly control the gap and enable the extrusion damage effect of the sealing to be minimum; meanwhile, the hydraulic oil can enter a sealing pressure cavity through an oil passing hole on the sealing ring groove, so that the pressure hermetically acted on the cylinder wall is increased, the sealing performance is greatly improved, and the hydraulic cylinder device has the working capacity under the ultra-high pressure.

Description

technical field [0001] The invention relates to a hydraulic cylinder device with a sealing gap adjustment structure, in particular to an ultra-high pressure hydraulic cylinder with a working pressure above 200 MPa, belonging to the technical field of ultra-high pressure hydraulic cylinder design. Background technique [0002] At present, with the development of new technologies, the demand for ultra-high pressure hydraulic cylinders with high precision, long life and continuous operation is becoming more and more extensive. The known ultra-high pressure hydraulic cylinders are designed based on a general design method. However, under the action of ultra-high pressure, the ultra-high pressure hydraulic cylinder has a large amount of expansion of the cylinder body, and the squeeze-in effect of the seal is seriously damaged. Under the large expansion and contraction, the seal The performance cannot be compensated, so when used for ultra-high pressure work, the service life is s...

AI Technical Summary

Problems solved by technology

The known ultra-high pressure hydraulic cylinders are designed based on a general design method. However, under the action of ultra-high pressure, the ultra-high pressure hydraulic cylinder has a large amount of expansion of the cylinder body, and the squeeze-in effect of the seal is seriously damaged. Under the large expansion and contraction, the seal The performance cannot be compensated, so when used for ultra-high pressure work, the service life is short, the continuous working ability is poor, and the leakage is serious. Therefore, the working pressure of the hydraulic cylinder designed by the existing means is low (the general working pressure does not exceed 70MPa, and a few reach 200MPa)

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