SU1270599A1 - Device for determining leak-proofness of articles - Google Patents

Abstract

The invention relates to the determination of leakage of a working fluid and allows improving the operational characteristics of a device by providing an automatic cessation of the supply of liquid to the product when it is destroyed, as well as protecting the device nodes from the effects of sudden pressure fluctuations in the pressure source. The flow sensor is made in the form of a cylindrical body with calibrated jets at its inlet and outlet. The sensing element of the sensor is made in the form of spring-loaded with respect to the ends of the housing - piston with an axial channel and damper. In the chamber; adjacent to the output end of the body, placed additional spring-loaded damper. The measurement of the leakage from the test product is made by the oscillation frequency of the sensitive element, which is recorded by the oscillation frequency meter, fulfilled in the form of a sequentially installed sensor and electronic unit. In the event of the sudden destruction of the product of CJC or pressure surges, which can destroy the product and the elements of the device, an additional valve closes the outlet. 1 il. ,

Description

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The invention relates to leak testing of products, in particular to the determination of leakage of working fluid.

The purpose of the invention is to improve the exudgement characteristics of the device by providing an automatic cessation of the supply of liquid to the product when it is destroyed, as well as to protect the device and device parts from the effects of sudden pressure fluctuations in the pressure source.

The drawing shows a device for determining - leaktightness of products.

The device includes a flow sensor made in the form of a tsipindric body 1 with calibrated inlet and outlet nozzles 2 and 3 installed on its inlet and outlet ends 4 and 5 of a sensitive element made in the form of a piston 6 with an axial channel 7 and a damper 8. Piston 6 . Installed in housing 1 with the outlet nozzle 3, Valve 8 is located in housing 1 on the side of the nozzle 2, A compression spring 9 is installed between the damper 8 and the inlet end 4 and a compression spring 10 between the piston 6 and the outlet end 5 of the housing 1 so that the valve 8 is pressed against the piston 64 One end of the bypass pipe 1 1 is connected to the input pipe 12 of the sensor, and the other through additional locking bodies 13 and 14 to the test item 15. The locking bodies 13 and 14 are connected to the locking body 16 intended for visual control tightness locking bodies 13 li 14 during the test Izlel 15

The valve 8 is made with an internal channel 17 of the T-shaped form, with which the annular groove 18 is connected,

. The compression spring 10 interacts with the piston 6, and the compression spring 9 is rigidly fixed to the end face 19 of the shutter 8 and the end face 4 of the housing 1. The inlet pipeline 12 of the flow sensor is designed to be connected to the pressure source 20, and the code pipe 21 to the product under test 15 through the locking member 22,

The device is provided with a chamber 23, one wall of which is formed by the outlet end 5 of the housing 1, and on the opposite wall 24 of the barrel there is an outlet 25 that connects the chamber 23 with the locking member 22. In the cavity of the chamber

23, an additional damper 26 is disposed, which is installed opposite the opening 25. A damper 26 is installed between the compression springs 27 and 28, so that a slit gap 29 is formed between the shutter 26 and the end of the opening 25 29. An adjustable discharge nozzle 30, a pressure gauge 31 and an oscillation frequency meter, made in the form of sequentially installed sensor 32 and electronic unit 33, connected to the outlet 25 of the chamber 23 and the shut-off member 22 through pipelines 34. The output of the adjustable discharge nozzle 30 is connected to the low-pressure cavity 35 The exit from the closure member 16 is also connected to the low-pressure cavity 35.

The device works as follows.

Install the test product

15. The working environment under pressure PL,

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served from a source of pressure 20 in the inlet pipe 12 and further into the cavity of the housing 1 of the flow sensor, loading the sensitive element. Under the action of the differential pressure, the valve 8 and the piston b begin to move downward, compressing the spring 10. Downward displacement occurs until the spring 9 from the compression position at which it pressed the end of the valve 8 to the end of the piston 6 and crossed the axial channel 7, will start to work stretch and tear the valve 8 from the axial channel 7 of the piston 6.

Claims (1)

In this case, under the action of the spring 9, the flap 8 returns to a position close to the initial one. Through the T-shaped channel 17 and channel 7, the working medium flows, resulting in a pressure drop on the piston 6 is compressed and the piston 6 under the action of the compressed spring 10 returns to its original position, gently meeting the end face of the valve 8. The valve 8 again closes the channel 7, and the cycle repeats. An annular groove 18 on the flap 8, connected to the channel 17, serves to unload the flap 8 from hydraulic friction. At the same time, the working medium gradually fills the cavity in which the spring 10 is located, and through the outlet pipe 21 and the downstream chamber 23 and the open shut-off member 22 — the cavity of the test article 15. The liquid enters the cavity of the test article 15 through the slit gap 29 and an opening 25 of the wall 24 of the chamber 23, which is formed between the end of the wall 24 and the additional gate 26 suspended in relation to it between the springs 27 and 28, the tightening of which determines the gap 2 and the flow through it. In the case of testing products with a large internal volume, the bypass pipe 11 is used to speed up their filling with the working medium, for which the shut-off bodies 13 and 14 are closed and the shut-off body 16 is closed. For a relative zero of the flow rate on block 33, velccine flow through the nozzle 30 is taken in the low pressure cavity 35 at a constant pressure RV, in the pipeline 34 and the closed shut-off organ 22. The flow rate through the jet 30 is set (in initial conditions) at which the dead zone of the dampers is selected and 8 due to leaks in precision gaps. The minimum oscillation frequency of the sensing element corresponding to this flow rate is detected by block 33 by a signal from sensor 32 connected to pipe 34 behind hole 25 in front of the orifice 30 and shut-off member 22. At line 34, a pressure gauge 31 is connected, which controls the pressure of ORIG. P testing of products. After fixing the frequency corresponding to zero flow, the locking member 22 opens, and with constant pressure maintained, the oscillation frequency at block 33 corresponds to the total flow (zero flow through nozzle 30 and flow due to leakage of the product). Product leakage is estimated by the difference in readings of unit 33. In case of sudden destruction of product 15, the flow rate of the working medium through the flow sensor increases. Through the gap gap 29, the flow rate increases instantaneously. The pressure inside the gap 29 drops sharply, at the additional damper 26, the differential increases sharply, the pressure, and compressing the spring 28, it closes the opening 25. The flow into the opening 25 stops and the pressure drops to zero. In case of sudden pressure surges Pgjj, the magnitude of which can destroy the tested product and device components, additional valve 26 also closes opening 25, pressure behind opening 25 and in pipe 34 before the orifice 30 drops to zero, as the orifice 30 vents it into the low cavity 35 pressure. The gap 29 is adjusted in the initial conditions by tightening the springs 27 and 28 to the maximum flow rate, which is determined by the flow rate through the nozzle 30 with the valve closed 22. Excess pressure P (or Reyh.) Higher than the allowable values leads to an increase in flow through the nozzle 30 and, therefore, through ZAZO) 29, which in this case is instantly closed by a flap 26. Gap 29 is only restored when the pressure Pg, ((or PB) (And recovers to the specified values or becomes lower. At this spring force 28, closed LCD and which increased when the shutter 26 was closed, the damper returns to its original position, which is facilitated and reduced by the effect on the damper (when closing) the force of the spring 27, the tightening of which has decreased. The shutter 26 opens the opening 25, and the test can be continued. tightness of products containing a flow sensor, made in the form of a cylindrical body with a calibrated inlet and outlet jets mounted on its ends, a sensing element made in the form of a piston with an axial channel installed in the housing from the side of the output puller, and a flap located in the housing from the side of the inlet nozzle, two compression springs, one of which is placed between the valve and the front of the body, and the other between the front and rear end of the body, that the damper is pressed against the piston, a bypass pipeline, one end of which is connected to the sensor input and the other is intended to be connected to the separable, from 1 the generator of the frequency of pressure oscillations and the adjustable drain valve, the stroke of the flow sensor is