SU1211618A1 - Vortex prod of leak detector - Google Patents

Abstract

The invention relates to the testing of hollow articles containing test gas, and makes it possible to increase the sensitivity of leak testing by expanding the range of detecting small leaks and measuring the tightness of products whose cavity is under the atmospheric or negative pressure of the test gas. The protective gas containing the test gas is supplied through the tangential channels into the main vortex chamber. The shielding gas forms in the central zone a region of reduced pressure and is divided into two streams: in the form of a hollow cone, which flows out of the axial nozzle, to shield the surface of the product from the direct gas, and in the form of an annular jet, which flows out through the axial hole. diaphragm, diffuser chamber and collector in annular nozzle for additional shielding of the test area. When the probe is in full contact with the product surface, the protective gas flows out with the greatest intensity, creating a deep dilution zone, which allows working with the negative pressure of the test gas in the product. At the same time, the test gas ejected by the protective gas through the annular channel and the capillary tube goes to the leak detector. 3 il. O) IND Od 00

Description

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This invention relates to a test apparatus, in particular to devices for testing hollow articles containing test gas.

The purpose of the invention is to increase the sensitivity of leak tightness control by expanding the range of detecting small leaks and measuring the tightness of products whose capacity is under the atmosphere {} or negative pressure of the test gas.

Fig, 1 shows the vortex probe leak detector, general view; figure 2 - node i in figure 1; on fig.Z - section aa in figure 1.

The vortex probe includes a housing 1, a main vortex chamber 2 with tangential channels 3 and an axial nozzle 4 for supplying protective gas, a diffusion chamber 5 with peripheral holes 6, separated from the main vortex chamber 2 by a diaphragm 7 with an axial hole 8, an annular nozzle 9 with a collector 10, channel 11

capillary shielding gas supply

a tube 12 with a channel 13 for sampling gas to the sensor 14 of the leak detector A sampling test: behind the sensor 14, those cheiskatal are made by a backing pump 15 with an adjustable throttle 16. The valve 17 distributes the protective gas to the tangential channels 3 through channel 18, and in the channel I for the supply of protective gas through the holes 19 and the cavity 20.

Vortex probe works as follows.

A clean compressed gas that does not contain test gas, or air with a minimum concentration of test gas is fed to valve 17. When searching for and measuring leaks, valve 17 is fixed in the extreme position at which the supply of protective gas to the main vortex chamber 2 carried out only through the tangential channels 3. In this mode, the protective gas due to the tangential arrangement of the tangential channels 3 with respect to the vortex chamber 2 and a sufficient pressure drop on them acquires a vortex-like motion with the formation in the central zone of the reduced pressure region. At the same time, the protective gas entering the main vortex chamber 2, through channel 18 and tangential channels 3, is divided into

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leaving it in two streams. The first of them flows out of the vortex chamber 2 through the axial nozzle 4 of the supply of protective gas in the form of a hollow cone, shielding the controlled surface from falling into it of the test gas.

The second stream of high-velocity protective gas flows from the vortex chamber 2 through the axial orifice 8 of the diaphragm 7 and into the diffuser chamber 5, where it is restored to full pressure. Then, the protective gas through peripheral holes 6 enters the collector 10, and from it into the annular nozzle 9, from which it flows out in the form of an annular jet, additionally shielding the inspected area. When the distance between the test surface and the probe is reduced, the outflow of gas already occurs mainly through the axial hole 8 of the diaphragm 7 and the circular nozzle 9. When the probe is in full contact with the test surface, all the incoming gas flows out of the vortex chamber 2 through the opening 9 of the diaphragm 7 and an annular nozzle 9 with the greatest intensity, creating in it on the axis a zone of deep dilution. This results in a positive pressure drop between the cavity of the product being monitored and the central vortex zone, which allows working with the negative pressure of the test gas in the product.

In the measurement mode, the sample gas is supplied to the sensor 14 and its regulation is carried out by a forevacuum pump 15 and throttle 16.

In idle mode, valve 17 is fixed in another extreme position. In this case, the protective gas through the opening 19 and the cavity 20 enters the vortex chamber 2 through the annular gap formed by the protective gas supply channel 11 and the capillary tube 12, and ejects test gas from the test gas removal channel 13 while protecting it from the test gas right now in the surrounding space.

Claims (1)

Invention Formula Vortex probe leak detector, comprising a housing with tangential channels for the supply of protective gas into its cavity and with an axial nozzle. A capillary tube placed in the cavity of the nozzle coaxially with the nozzle to remove the test gas to the leak detector, characterized in that it is equipped with a diaphragm placed in the body with the formation of two cavities, in one of which there is an end of the capillary tube, in order to increase the sensitivity tangential channel outputs and one of the torus ten An axial nozzle covering the body part with an annular nozzle, the inlet of which is connected to the second cavity, and the outlet is intended to be connected to the atmosphere and located in a plane parallel to the plane of the other end of the axial nozzle; rna tube with the formation of the annular channel. P I Phi2. BUT-/ .2 VNIIPI Order 634/47 Circulation 778 Subscription Branch PPP Patent, Uzhgorod, Proektna St., 4 Fig.Z