SU1252682A1 - Apparatus for leakage testing of closed articles - Google Patents

Abstract

The invention relates to leakage tests for closed I37 deli and allows for increasing the sensitivity of test products by reducing the background gas of the test gas in the test chamber. The device contains a cam with a tong, the perimeter of which contains pneumatic screens in the form of pipelines. The first pipeline is fixed at the end of the chamber and has two rows of holes, respectively, arranged parallel to the side surface and end of the chamber. The second pipeline is fixed on the lid and has a number of holes parallel to the 1) 1x external surface of the capsule. The pipelines are connected to the source of process gas through elastic hoses and create a protective gas curtain when the chamber is opened. The clamping elements of elastic hoses are fixed on the top and end of the chamber. The capsule, located in the chamber, on the side of the surface has a hatch with a flap and an opening. The total orifice of the capsule's openings is less than the total orifice of the pipelines. One of the ends of the capsule is sealed on the lid of the chamber. An attenuating element is installed between the walls of the chamber and the other open end of the capsule. The chamber is connected to a vacuum system, a gas analyzer and a source of process gas. 1 hp f-ly, 1 ill. (L U1 9d x) N9

Description

one

This invention relates to leak testing of products.

The purpose of the invention is to increase the sensitivity of the test by reducing the background of the test gas in the test chamber and increasing the ease of operation.

The drawing shows a diagram of the device.

A device for testing the tightness of closed products contains a chamber 1 with a lid 2 for accommodating the test article 3 located in the chamber 1 capsule 4 with a hatch

5, closed spring-loaded damper

6, and the evacuation system 7 and the gas analyzer 8 connected to the chamber 1. There are guides 9 outside the chamber 1 for moving the cover 2 along the axis of the chamber 1, and inside the perimeter of the chamber 1 there are pneumatic screens installed in the form of a pipeline 10 fixed to the end of the chamber 1 and a pipe 11 fixed on the roof 2. There are on the pipe 10

two rows of holes 12 and 13, the axes of which are respectively parallel to the side surface and the surface of the end face of the chamber 1.

The pipeline 11 has a series of holes 14, the axes of which are parallel to the outer surface of the capsule 4. The pneumatic cranes are connected to the source 15 of the process gas.

The process gas flowing through the holes 12 and 13 of the pipeline 10, respectively, forms a protective curtain on the inner surfaces of the side surface and the end face of the chamber 1. In addition, this gas creates excessive pressure in the cavity formed by the chamber 1 and the capsule 4, since the total flow area of the holes 20 on the capsule 4 is smaller than the total flow area of the openings 12 and 13 O of the pipeline 10, and the gap between the openings of the chamber 1 and the capsule 4 is sealed by the sealing element 21, Open the flap 6 in the capsule 4 and through the hatch 5 zhayut

using elastic hoses 16, passing 35 into chamber 1 test article 3. Passing between clamping elements 17 and 18, located respectively on chamber 1 and cover 2. Chamber 1 is also connected to the source 15 of the process gas by means of a pipeline with a valve 19. Along the perimeter of the capsule 4, holes 20 are made; at one end, the capsule 4 is tightly fixed on the lid 2, and the second end of the capsule 4 freely enters the chamber 1. A sealing element 21 is installed in the gap between the surface of the chamber 1 and the capsule 4.

The device works as follows.

The chamber 1 without the test article 3 is closed with the lid 2 and using the evacuation system 7 it is pumped out until the residual background gas of the test gas, measured from the bottom of the gas analyzer 8, reaches an acceptable value, after which the system 7 vacuum 10

252682J

fattening off. Then the valve 19 is opened, the chamber 1 is connected to the source 15 of the process gas, with which the chamber 1 is filled to atmospheric pressure and then the valve 19 is closed. Along the guides 9, pull back 2 and open the chamber 1. With this, the clamping members 17 and 18 release the flow area of the elastic hoses 16 and the pipes 10 and 11 are connected to the source 15 of the process gas. The process gas flowing through the openings 14 of the conduit 11 forms a curtain protecting the outer surface of the capsule 4 from contact with the environment.

The process gas flowing through the holes 12 and 13 of the pipeline 10, respectively, forms a protective curtain on the inner surfaces of the side surface and the end face of the chamber 1. In addition, this gas creates excessive pressure in the cavity formed by the chamber 1 and the capsule 4, since the total flow area of the holes 20 on the capsule 4 is smaller than the total flow area of the openings 12 and 13 of the pipeline 10, and the gap between the openings of the chamber 1 and the capsule 4 is sealed by the sealing element 21. Open the flap 6 in the capsule 4 and through the hatch 5 load dissolved

The test article 3 is placed into the chamber 1. The cover 2 is placed along the guides 9 and the chamber 1 is closed. The clamping elements 17 and 18 block the flow sections of the elastic hoses 16 and the flow of process gas to the pipelines 10 and 11 is stopped. The evacuation system 7 is turned on and the process gas is pumped out of chamber 1, then with

using a gas analyzer 8, the amount of leakage of the product 3 is determined by the change in the background of the test gas in chamber 1. The evacuation system 7 is turned off, the valve 19 is opened

and fill the chamber 1 with the process gas, then the valve 19 is closed. Open the camera 1 and through the hatch 5 take out the product 3.

The device reduces the background gas in the test chamber, which increases the sensitivity of the test.

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Claims (1)

1. A device for testing the tightness of closed products filled with test gas, comprising a chamber with a lid for placing the test product and an evacuation system connected to the chamber, a gas analyzer and a source of process gas, characterized in that, in order to increase the sensitivity of the tests of products filled gas contained in the environment, it is equipped with a capsule, one of the ends of which is sealed on the lid, sealing element installed on the side of the other open end Psules between its walls and the walls of the chamber, connected to the source of process gas by two pneumatic screens, made in the form of pipelines, installed along the perimeter of the chamber. 526824 The first pipeline is fixed at the end of the chamber and has two rows of holes, the axes of one row of which are parallel to the side surface of the chamber, 5 and the axes of the other / second are parallel to the surface of the end of the chamber, and the second pipeline is fixed on the lid and has a row of holes that have axes parallel to the outer the surface of the capsule, which has a hatch with a flap and holes on the side surface, the total flow area of which is less than the total flow area of the holes of the first pipeline. 5 to 2, the apparatus according to claim 1, characterized in that, in order to increase ease of operation, it is provided with clamping elements attached to the clamps and end of the chamber, and the pipelines are connected to the source of process gas through elastic grooves extending between the clamping elements. Editor M.Blanar Compiled by V.Chernousov Tehred M.Hodanich Order 4616/44 Circulation 778 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 Proofreader S. Shekmar