SU1216692A1 - Leakage detector - Google Patents

Abstract

The invention relates to a test technique, can be used when searching for places of the neger (metric products and allows you to increase the sensitivity of leak detection using a probe by reducing fluctuations in the background signal caused by fluctuations in temperature of the samples taken. The central channel of the probe tip is communicated through the first tube leak detector, and the annular channel surrounding it communicates through a second tube, covering the first along the entire length, with a thermostated source of protective gas. After the thermostat and source of protective gas are turned on in a stationary mode of operation of the device on a known defect-free product, the test signal is tested and the test gas passes through the second tube and stabilizes the temperature of the sample.

Description

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The invention relates to a testing technique and can be used when searching for leaks using ntyna.

The aim of the invention is to increase the sensitivity of leak detection.

Figure 1 shows the device, a general view; figure 2 -. node 1 in figure 1; on fig.Z - node And on figure 1;

The leak detection device comprises a tip 1 with a centrally located central channel 2 and an annular channel 3, a leak detector 4, communicated by the first tube 5 with the central channel 2 of the tip 1, the device also contains a protective gas source 6 that does not contain a test, reported second tube 7 with a ring channel 3 of tip 1, and the second tube 7 covers the first tube 5 along its entire length from tip 1 to the leak detector 4, the second tube 7 is thermally insulated from the surrounding atmosphere by the third tube 8. Source 6 the protective gas thermostated by a thermostat 9 and arranged in its cavity vessel 10 made with sectional overflow coupled deleterious gas sequentially through the sections of the cavity controlling the gas - helium is supplied into the cavity of the article 11, controlled from a source 12,

The device works as follows;

First, the magnitude of the background signal is determined, for which the thermostat 9, the source of protective gas 6 and the ambassador of the stationary operation of the device are established, bring the tip .1 to a defect-free product and determine the background signal on the leak detector 4. Then product inspection

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11. At the same time, the protective gas, passage through tube 7 stabilizes the temperature of the sampled sample passing through channel 3 and tube 5. Then, the leakage value is calculated taking into account the background signal.

The use of the device makes it possible to increase the accuracy of leakage measurement, since the thermostabilization of the sampled samples reduces the oscillations of the background signal, the latter becomes more stable in amplitude, and the signal fluctuation decreases, and to reduce the background signal it is advisable to perform thermostabilization at positive temperatures, t . by heating.

In addition, there is an additional positive effect from the thermal stabilization of the protective gas, which consists in the fact that when the protective gas is heated, the surface of the controlled product heats up, while

25 most defective product defects.

Claims (1)

Formula invented and 30 Leak Detection Device-; ki containing a tip with centrally located central and annular channels, a leak detector, the first tube connecting the leak,. a catel with a central channel of the tip, a source of protective gas, a second tube connecting the source of protective gas to an annular channel of the tip, characterized by In order to increase the sensitivity, the second tube covers the first along its entire length from the tip to the leak detector and is thermally insulated from the surrounding atmosphere, and the source of EE (thermostatic gas) is wound. C. eleven fZ Bh fi 9 L / W Fi & .1 2 To pkcheiskshpell