Hand-operated reversing valve and sealing structure thereof

Abstract

The invention provides a hand-operated reversing valve and a sealing structure thereof. The hand-operated reversing valve has a sealing structure, a liquid return main sealing element is positioned in a first annular cavity, and the inner circumferential wall and the outer circumferential wall of the liquid return main sealing element are respectively butted against and in contact with the inner circumferential wall and the outer circumferential wall of the first annular cavity; and / or a liquid feed main sealing element is positioned in a second annular cavity, and the inner circumferential wall and the outer circumferential wall of the liquid feed main sealing element are respectively butted against and in contact with the inner circumferential wall and the outer circumferential wall of the second annular cavity. Through the adoption of the technical scheme provided by the invention, the main sealing structure adopts a radial dynamic sealing manner, so as to greatly reduce the wear of the main sealing element, improve the antifouling capacity of the main sealing element and prolong the service life of the main sealing element. The hand-operated reversing valve provided by the invention is provided with the sealing structure of the above hand-operated reversing valve.

Description

technical field [0001] The invention relates to the field of control valves, in particular to a manual reversing valve and its sealing structure. Background technique [0002] The manual reversing valve is one of the most important hydraulic components of the hydraulic support used in coal mines. In the control system of the hydraulic support, it controls the direction of the liquid flow and realizes different actions of the hydraulic support. At present, the main seals (including the liquid return main seal and the liquid inlet main seal) between the oil return chamber, the working chamber and the high pressure chamber of the manual reversing valve mainly use conical soft seals, conical hard seals or flat soft seals, etc. For the main sealing structure, for example, the patent documents with the patent application numbers 201120175187 and 201120015319 respectively provide specific implementations of the main sealing structures of the conical surface seal and the flat soft s...

AI Technical Summary

Problems solved by technology

However, the above-mentioned cone seal form is the main seal realized by the axial butt contact between the steel surface and the steel surface when the valve core moves in the axial direction. It has poor anti-pollution ability, and the pollution particles are easier to get stuck on the valve core and Between the sealing seats, resulting in the problem of poor sealing and liquid leakage of the valve core; the above-mentioned flat soft seal form is when the metal valve core moves in the axial direction, the ring end surface on the valve core and the rubber material seal. The main seal realized by the axial pressure contact of the flat end face, although the sealing effect is improved, but after the long-term reversing work of the manual reversing valve, the annular end face of the valve core will cause indentation and wear on the end face of the rubber seal In severe cases, the rubber seal may be worn out, affecting the service life and sealing effect of the rubber seal, and will eventually affect the service life of the manual reversing valve

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