CN-116464847-B - Airtight test fixture

CN116464847BCN 116464847 BCN116464847 BCN 116464847BCN-116464847-B

Abstract

The invention belongs to the technical field of tightness test devices, and particularly provides an airtight test clamp. The airtight test fixture comprises an inlet joint and an outlet joint, wherein the inlet joint is provided with a mounting hole for mounting the inlet end of a tested thin-wall cylinder, the outlet joint is provided with a mounting hole for mounting the outlet end of the tested thin-wall cylinder, the mounting holes of the inlet joint and the outlet joint are respectively provided with a sealing ring used for being in circumferential sealing fit with the tested thin-wall cylinder, and the inlet joint is provided with a sealing connection structure and an air passing channel used for being in sealing connection with a test bed. The inlet joint and the outlet joint are in sealing fit with the periphery of the tested thin-wall cylinder, bolts and flange plates do not need to be disassembled and assembled for many times, and the sealing ring is not contacted with the sharp end part of the thin-wall cylinder.

Inventors

XIE XIANWANG
TIAN YING
ZHANG ZHONGMING
WANG YANAN
GONG WENYU
MU SHICHAO
Lou chaoyang

Assignees

新乡平原航空液压设备有限公司

Dates

Publication Date: 20260512
Application Date: 20230506

Claims (8)

1. The airtight test fixture comprises an inlet joint and an outlet joint, wherein the inlet joint is provided with a mounting hole for mounting the inlet end of a tested thin-wall cylinder, the outlet joint is provided with a mounting hole for mounting the outlet end of the tested thin-wall cylinder, and the airtight test fixture is characterized in that the mounting holes of the inlet joint and the outlet joint are respectively provided with a sealing ring used for being in circumferential sealing fit with the tested thin-wall cylinder, the inlet joint is provided with a sealing connection structure used for being in sealing connection with a test bench and an air passing channel, the airtight test fixture further comprises a supporting cylinder, the supporting cylinder is used for being sleeved on the outer side of the tested thin-wall cylinder, the end face of one end of the supporting cylinder is used for supporting the sealing rings, the end face of the other end of the supporting cylinder is used for being in blocking fit with the stepped large-diameter section of the tested thin-wall cylinder, or the supporting cylinder is an elastic supporting cylinder which can be tightly sleeved on the outer side of the tested thin-wall cylinder, and the end face of one end of the supporting cylinder is used for supporting the sealing rings.
2. The air tight test fixture of claim 1, wherein the sealing connection comprises a cone thread provided on the outer periphery of the inlet fitting.
3. The tightness test clamp of claim 1 wherein said flexible support tube is provided with a slit that can be expanded to form a mounting channel for a sleeved test thin walled tube.
4. A gas tightness test fixture according to claim 3 wherein said cutout is a diagonally arranged bezel.
5. The airtight test fixture according to claim 1, wherein an elastic ferrule is further provided on the outside of the elastic support cylinder.
6. A gas tightness test fixture according to claim 1 or 2 wherein the outlet fitting is provided with a sealing connection for sealing connection with a test bed and an overgas passage.
7. An airtight test fixture according to claim 1 or 2, wherein said inlet and outlet fittings are detachably connected and jointly enclose a test chamber for mounting a thin walled cylinder under test.
8. The air tightness test fixture of claim 7 wherein said outlet fitting is further provided with a viewing window.

Description

Airtight test fixture Technical Field The invention belongs to the technical field of tightness testing devices, and particularly relates to an airtight test clamp. Background The outer cylinder of the filter product for spaceflight is a thin-wall welding piece, and after welding is completed, the air tightness of a welding line is required to be tested and detected. The conventional detection method is to connect flanges to two ends of a filter through bolts in a sealing manner to form end seals of the filter and the flanges, then vent air from the vent holes of the flanges into the filter, and observe whether air leaks. Because the wall thickness of the filter is thinner (less than or equal to 1 mm), the end part of the filter is sharp, and when the flange and the bolt are disassembled, the filter is easy to deform or scratch the sealing element at the end part of the flange, so that the sealing is invalid, and the reliability is poor. Disclosure of Invention The invention aims to provide an airtight test clamp which is used for solving the technical problem of insufficient reliability of airtight test of a thin-wall cylinder in the prior art. In order to achieve the above purpose, the technical scheme of the airtight test fixture provided by the invention is as follows: The utility model provides an airtight test anchor clamps, includes entrance joint and exit joint, and entrance joint is equipped with the mounting hole that is used for installing the thin wall section of thick bamboo entrance end of being tested, and exit joint is equipped with the mounting hole that is used for installing the thin wall section of thick bamboo exit end of being tested, and entrance joint and exit joint's mounting hole all are equipped with be used for with the sealing washer of the thin wall section of thick bamboo circumference sealing fit of being tested, entrance joint be equipped with be used for with test bench sealing connection's sealing connection structure and air passage. The airtight test fixture has the beneficial effects that the existing airtight test fixture is improved. During detection, the inlet connector is in sealing connection with the test bed, and the gas of the test bed can directly enter the tested thin-wall cylinder through the inlet connector. The inlet joint and the outlet joint are in sealing fit with the periphery of the tested thin-wall cylinder, bolts and flange plates do not need to be disassembled and assembled for many times, and the sealing ring is not contacted with the sharp end part of the thin-wall cylinder. As a further improvement, the sealing connection structure comprises taper pipe threads arranged on the periphery of the inlet joint. The taper pipe thread has the beneficial effects that the taper pipe thread is of a standardized sealing structure, and the test fixture can be directly arranged on a test bed of a threaded air hole with the taper pipe thread with the same standard, so that the universality of the test fixture is improved. As a further improvement, the test fixture also comprises a supporting cylinder, wherein the supporting cylinder is used for being sleeved on the outer side of the tested thin-wall cylinder, one end of the supporting cylinder is used for supporting the sealing ring, the other end of the supporting cylinder is used for being in stop fit with the stepped large-diameter section of the tested thin-wall cylinder, or the supporting cylinder is an elastic supporting cylinder which can be tightly sleeved on the outer side of the tested thin-wall cylinder, and one end of the supporting cylinder is used for supporting the sealing ring. The support cylinder has the beneficial effects that the support cylinder can provide stable support for the sealing ring and prevent the sealing ring from being blown away by overlarge gas pressure to cause sealing failure. As a further improvement, the elastic support cylinder is provided with a notch which can be expanded to form a mounting channel for sleeving the tested thin-walled cylinder. The elastic support cylinder has the beneficial effects that the elastic support cylinder is conveniently sleeved on the outer side of the thin-wall cylinder. As a further improvement, the cut is a bevel arranged obliquely. The elastic support tube has the beneficial effects that a coating can be formed on the elastic support tube, so that the connection stability of the elastic support tube and the thin-wall tube is improved. As a further improvement, an elastic ferrule is arranged outside the elastic supporting cylinder. The elastic support cylinder has the beneficial effects that the stability of the connection of the elastic support cylinder and the thin-wall cylinder is improved. As a further development, the outlet connection is provided with a sealing connection for sealing connection with the test stand and with an overgas channel. The test fixture has the beneficial effects that the two ends of the thin-wall cylinder can