Echelon form ring seal

Abstract

A trapezium ring seal comprises a ring material holding chamber and a sealing ring. The ring material holding chamber is used for holding the sealing ring. The ring material holding chamber is enclosed into a whole by two fluid holding elements that are connected with each other by a holding thread. A section of the ring material holding chamber is a continuous fluid holding chamber in the arrangement of circling fluid, the section of which is trapezium-shaped. The high edge of the trapezium is arranged along the circling radius; a short bottom is arranged inside and a long bottom is arrangedoutside. The trapezium ring seal is an annular sealing structure, the section of the ring material holding chamber of which is a trapezium, and can be used for sealing o the end surface is connected with the holding thread. The invention has a temperature compensation effect on the seal consisting of a ring material mat with different temperature parameters and a holding chamber.

Description

[0001] The application of the present invention is a divisional application, the original application number is 200510097905.6, the application date is August 23, 2005, and the title of the invention is ball valve and triangular sleeve seal and trapezoidal ring seal. technical field [0002] The invention belongs to the technical field of static sealing arranged around a fluid, not the technical field of dynamic sealing arranged around a rod / shaft, and particularly relates to a temperature compensation sealing structure. The ball valve is only one specific product used to illustrate the present invention. Background technique [0003] Valves are switches for fluid delivery and control. All valves have a switching element, such as the ball in ball valves, the disc in gate valves, and the disc in globe valves. The valve switch element is set in the fluid channel of the valve body, and has an open position that allows fluid to pass through and a closed position that prevents f...

AI Technical Summary

Problems solved by technology

It is used as the sealing packing for the second seal of the valve stem. Traditionally, low-end products use packing or flat gaskets, and high-end products use V-shaped cross-section gaskets, but the sealing is completed by forcing them to embrace the stem by axial pressure; Since the valve stem, packing, stuffing box, and packing compression ring cannot be completely concentrically installed and pressed symmetrically, the packing's holding force on the rod is along the circumferential direction. The orientation is also uneven, so that when the valve stem is completely sealed, some points have reached the degree of over-extrusion that is extremely easy to wear, that is to say, the material utilization rate of the sealing packing structure in the prior art is low and not wear-resistant; The sealing force is along the axial direction of the valve stem. Obviously, the sealing effect on the thrust end face of the valve stem is direct, and the sealing effect on the cylindrical surface of the valve stem through the packing is indirect, especially for the radial sealing force component is zero. It is impossible for the packing and flat gasket packing to take effect at the same time as the end face seal. Often the packing seal does not take effect when the thrust end face seal takes effect, and the end face seal is squeezed out when the packing seal takes effect. The positive and negative V-shaped fit can produce radial sealing force, but there is endless compressed air in the upper and lower negative-yang V-shaped angle difference joints, which is greatly affected by temperature and pressure changes. Therefore, like other packings in the prior art, The seal adjustment is so insensitive that the spring compensation is invalid

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