Sealing device and valve

Abstract

The invention discloses a sealing device and a valve. The sealing device comprises a first component, a second component, an O-shaped ring, a first guide ring, a second guide ring, a first stop part and a second stop part, wherein the first component and the second component are provided with holes; the second component is arranged in the hole of the first component, and forms a first shaft shoulder and a second shaft shoulder; and the outer peripheral surface of the second component is formed with an annular groove. The O-shaped ring is arranged in the annular groove. The second component utilizes the first stop part and the second stop part to axially position relative to the first component. The first guide ring is positioned between the first shaft shoulder and the first stop part, and the second guide ring is positioned between the second shaft shoulder and the second stop part. The annular surface of the first shaft shoulder is a cross conical surface, and the axial end face of the first guide ring relative to the first shaft shoulder also forms a cross conical surface so as to ensure that the first guide ring is inclined to radially outside slide during bearing the axial pressure. The first guide ring is made of a material with elasticity and sealing function, bears the axial pressure under an assembling state, and generates preset decrement.

Description

[0001] technical field [0002] The invention relates to a sealing device and a valve using the sealing device. Background technique [0003] It has always been a challenge to achieve a reliable seal between two parts that have relative motion between each other, such as relative rotation or relative linear movement or both relative rotation and relative linear movement. The traditional design is to combine static sealing and dynamic sealing with one sealing component, such as O-ring, figure 1 A ball valve 100 employing this type of O-ring is shown. [0004] Such as figure 1 with 2 As shown, the ball valve 100 includes a ball 10 disposed in the valve cavity as an opening and closing member, and a valve stem 3 for driving the ball to rotate, and the valve stem 3 is made of brass or stainless steel. A groove 11 and a through hole 12 are formed on the ball, and a handle 32 is formed on one end of the valve rod 3 to fit the groove 11 and to be inserted into the groove. [000...

AI Technical Summary

Problems solved by technology

In case of shear damage to the O-ring, its sealing effect will be seriously affected

[0011] Therefore, between relatively moving parts and in valves used to transmit pressure fluid, the use of O-rings as sealing elements has the defect that the sealing effect gradually decreases over time, which may cause fluid leakage, while the fluid The amount of external leakage is an important criterion to measure the quality of the sealing structure

Furthermore, the guide ring 2 has little elasticity and does not have a sealing function and does not automatically ensure the centering of the valve stem in the bore 21 of the overhanging sleeve

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