RU2467231C1 - Sealing connection with elastic edge - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention refers to sealing equipment and is designed for sealing devices of systems and units operating in wide range of temperatures and pressures, for example in the field of rocket-and-space equipment, and namely in detachable connections in the line of filling the carrier rocket with liquid oxygen, hydrogen and helium. Sealing connection with elastic edge includes stiff spherical shutoff member with bellows element, which is installed on elastic thin-wall seat with a retaining ring. Contact surface of elastic thin-wall seat is concave and has the curvature radius that is smaller than curvature radius of spherical sealing surface of stiff spherical shutoff member.

EFFECT: invention is aimed at simplification of the design, reduction of overall dimensions, weight and sealing force, improvement of manufacturability, improvement of sealing reliability at changing the operating conditions.

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Description

The invention relates to sealing equipment and is intended for sealing devices of systems and assemblies operating in a wide range of temperatures and pressures, for example, in the field of rocket and space technology. In particular, in detachable connections along the refueling line of the launch vehicle with liquid oxygen, hydrogen and helium.

Known sealing device containing a locking spherical element in contact along the edge of a thin-walled ring, and having a duplicated seal with an aluminum gasket (AS USSR No. 804985).

Also known is a sealing device comprising a bellows element with sealing lips and a backup gasket (US Pat. No. 3,671,075).

The disadvantages of the above devices are their complexity and the fact that to ensure tightness requires significant sealing forces that are evenly distributed along the contour of the devices.

Known sealing compound (patent RU No. 2129681), containing a locking member installed with the possibility of interaction with a thin-walled shell, elastically deformed upon contact.

The disadvantage of this connection is the dependence on the magnitude of the perceived effort, which changes during operation. In this case, the contact on the surface passes into contact along the line, which deprives the sealing compound of the claimed advantage.

The closest in technical essence to the claimed seal is a valve device selected as a prototype with duplicated elastic edges, made in the form of thin-walled cylindrical shells (seats) in contact with a rigid locking conical element, valve (Seals and sealing technique. Reference. Under the general editorship A.I. Golubeva and L.A. Kondakova, Moscow: Mashinostroenie 1986, p. 231, figures 7.9, d; b).

Sealing is achieved by contacting the locking element with the sharp edges of the seats.

The disadvantages of the known design are: the difficulty of manufacturing two concentric sealing lips with stringent alignment requirements, increased dimensions, weight and sealing force. The increase in the latter is caused by the need to create elastic deformations in two thin-walled saddles.

The objective of the invention is to simplify the design, reduce the size, weight and strength of the seal, improve manufacturability, increase the reliability of the seal when changing operating conditions.

The problem is achieved in that in a sealing connection with an elastic lip containing a rigid spherical locking element with a bellows element mounted on a thin-walled elastic saddle with a restrictive ring, the contact surface of the thin-walled elastic saddle is made concave with a radius of curvature less than the radius of curvature of the spherical sealing surface of a hard spherical constipation, i.e. R _to > R _c, where

R _to - the radius of curvature of the spherical locking member;

R _c is the radius of curvature of the contacting surface of the thin-walled elastic saddle.

The invention is illustrated by drawings.

Figure 1 shows a sealing connection with an elastic lip in the initial contact position of a hard spherical locking element with a thin-walled elastic saddle, i.e. at the beginning of loading.

Figure 2 - element a in figure 1; operating position of the sealing joint.

The sealing connection with an elastic lip contains a hard spherical locking element 1 with a bellows element, a thin-walled elastic saddle 2 with sealing edges 3 and 4; restrictive ring 5, preventing the destruction of the elastic edge when it is deformed.

Sealing connection with an elastic lip operates as follows. When a rigid spherical locking element 1 is mounted on a thin-walled elastic seat 2, the connection is sealed by contacting them along the edge 3. With increasing pressure of the medium being sealed, an axial force arises, pressing the rigid spherical locking organ 1 against the thin-walled elastic seat 2. The thin-walled elastic saddle 2 is deformed, providing the contact of the hard spherical locking element 1 and with the lower edge 4 of the thin-walled elastic seat 2, forming a second sealing barrier, which improves the reliability of joint connection.

This technical solution provides a simplification of the design, increasing the reliability of the seal when changing operating conditions, reducing the size and weight, as well as the sealing force, improving manufacturability and reducing the complexity of manufacturing.

Claims (1)

A sealing connection with an elastic lip containing a rigid spherical locking element with a bellows element mounted on a thin-walled elastic saddle with a restrictive ring, characterized in that the contact surface of the thin-walled elastic saddle is made concave with a radius of curvature less than the radius of curvature of the spherical sealing surface of a rigid spherical locking organ, t .e. R _to > R _with , where
R _to - the radius of curvature of the spherical locking member;
R _c is the radius of curvature of the contacting surface of the thin-walled elastic saddle.

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