SU1698657A1 - Blower for checking hollow articles for tightness - Google Patents

Abstract

The invention relates to a testing technique and can be used to monitor the leaktightness of products by a mass spectrometric method using blowers. The purpose of the invention is the expansion of technological capabilities. The blower comprises a housing 4 in which a porous accumulator 3 is placed with a perforated tube 1 for supplying a test gas. On the casing 4, a nozzle-tip, made in the form of a tube 6 with a tip 7. is fixed. material. 2 hp f-ly, 4 ill.

Description

The invention relates to a testing technique, in particular to the control of the tightness of hollow articles by mass spectrometry using blowers.

The purpose of the invention is the expansion of technological capabilities by ensuring the control of products of complex configuration and local blowing in hard-to-reach places.

Figure 1 shows the blower, section; Fig. 2 shows the blower when used for total blowout, a general view; fig.Z - the same, with local blowing; Fig. 4 shows various options for arranging the airbags on the product.

The blower consists of a flexible perforated tube 1 with openings 2 for feeding test gas into the test zone. Tube 1 is located

inside the porous storage unit 3, made of flexible material, which serves to evenly distribute the test gas in the test area, as well as to accumulate it, which is necessary for detecting large leaks when applying a blower to the test area without supplying the test gas. To prevent the control gas from scattering, the blower from the outside has a flexible elastic gas-tight casing 4, made in the form of an open band, and to give the blower a shape corresponding to the profile of the test surface, a strip 5 of a flexible, preserving the given shape of material (soft metal) frame. To search for local leaks, a nozzle-tip, made in the form of a flexible tube 6 with a tip 7, is provided.

OE

with

00

about ate

(Fig.2 and 3) at the end. The control gas is supplied to tube 1 (with total blowing) or tube 6 (with local blowing) using a three-way valve 8 (Figures 2 and 3). The frame elements 5 (FIGS. 1 and 4) are provided with fixation elements 9 (FIG.). Weld seams should be checked for tightness.

The blower works as follows ..

First, the seam area of the test product is subjected to total blowing. LL of this blower is given a shape corresponding to the profile of the tested product (see fig.), Where A is a straight seam, or a directly controlled surface; B - curved seam or surface; B - ring seam or surface.

Then a blower is applied to the vacuum-evacuated product connected to the leak detector and the gas 8 is supplied with the test gas to the tube 1. The test gas passes through the holes 2, is dissipated by the porous drive 3 and flows evenly into the test zone. In the absence of this, the next piece of the item is checked. If there is a leak, then the control gas through the microcracks of the bottom gives into the closed evacuated i

the volume of the product, and then enters the topic mass spectrometry chamber; seeker connected to the subject. product. The reading is recorded in the leak detector devices. The location of a specific leak is determined by the local blowing method. For this, valve 8 stops supplying the test gas to tube 1 and injects gas into tube 6. In the form of a thin jet, it exits tip 7 and is directed to the tested part, the current of the product under test for local leak detection. In the presence of a large leak, the flow of the sample gas is undesirable because of the possibility of a large amount of gels entering the mass spectrometric chamber of the leak detector, which leads to. for a large its pollution. and the long pumping time of this,

 gas from the device chamber (ЗП-бО мин).

86574

The use of a gas reservoir saturated with test gas makes it possible to eliminate the preliminary detection of coarse leaks by the saponification method. The blower allows you to check for leaks.

0

five

0

five

0

five

0

the importance of not only small but also large objects with various complex shapes and hard-to-reach areas.

The invention allows producing total airflow around the product control zone, and upon receiving a total signal about the presence of one or several leaks, proceed to locating them with a three-way valve 8 and a choke-tip.

invention formula

Claims (3)

1.Blower for - monitoring the tightness of hollow products, containing a gas-tight casing and a control gas accumulator placed in it, made in the form of a strip of porous material, a perforated tube placed inside the accumulator, a fitting-tip for local blowing, mounted on the casing, and a valve connected with a ferrule and perforated tube for connecting With a source of control Strip, characterized in that, in order to expand -. technological capabilities by ensuring control of products of complex configuration and local blowing in hard-to-reach places, the casing is made in the form of an open band, the casing, perforated tube and accumulator are made of flexible material the axis coincides with the longitudinal, the housing axle 2. The blower according to claim 1, characterized in that, in order to improve ease of use, it is provided with frame elements fixed to the casing and made of a flexible material that preserves the desired shape. 3. The blower according to claim 1, that tl and h as the fact that the crane for the connection of u and with a source of control gas made three-way. M f M t f t M M M t t figure 1 3c7MM # yrr7tr / t / o5em S70 & in & Q From is / pochnu / #a fig2 my # / п / уа / гм0е0 г03 & s t W From sources | FIG. 3 control gas W AT