SU1566246A1 - Method of testing articles for hermetic sealing - Google Patents

Abstract

The invention relates to the control of the tightness of hollow articles and allows for greater reliability. In the cavity of the product serves the liquid under atmospheric pressure. Connect the cavity of the product through a pipeline with a gas source under the same test pressure. After the holding time, the product is simultaneously disconnected from the pipeline, and the latter from the gas source. Connect the cavity of the control volume with the measuring tank and the pipeline. The leakage of the product is judged by the amount of fluid displaced into the measured capacity. 1 il.

Description

The invention relates to a testing technique and allows monitoring the leaktightness of external leaks and internal leakages of hollow articles.

The aim of the invention is to increase the reliability by providing a constant indicator of the polytropic process of gas expansion for products of various sizes.

The drawing shows a diagram of the device dp implementation of the method of testing products for tightness.

The device contains a capacitance 1 for storing the test liquid, a discharge line with a pump 2, a filter 3 and cranes 4-6, a pumping main with a tap 7 connected in series. A pneumohydraulic valve 8 is connected to the discharge line, and through its distribution grid 9 tr The i-piping is connected with the test of phosphodia 10. The pressure in the accumulator 8 KIHT is driven by a pressure gauge 11. The charging cavity of the accumulator 8 is produced through a valve 12 from a source of compressed gas (not shown). The tank 13 is connected to the injection line by a pipeline with a series 14 valve and an additional tank 15. The liquid 13 enters the free cipveii through the capillary, preventing ei from flowing out of the absence of Fc orc, pressure differential capillary. The volume of capacitive t and 15 is chosen from the conditions for ensuring the measurement of maximum leakage.

The method is drying in a manner.

Connecting testing 10 hours, opening dior cranes 4-7, turn on the IT i-co 2 and the prod.r-it-v ZHID10S1; through item 10

out of it air. Put the distributor 9 into position in, fill the pipeline section between the distributor 9 and the injection line with liquid. Turning the dispenser into position b. Shut off the valve 7 and when the pump 2 is running raise the pressure in the product 10 and the battery

8to test. The control is on the pressure gauge 11. Turn off the valve 4, turn off the pump 2. Perform a specific time to stabilize the pressure in the product 10. Turn off the valve 5. switch valve 9 to position a. Maintain the product 10 for a specified time.

In this case, instead of the liquid that has flowed out of the product 10 through the distributor

9c pipeline between it and the product

10 gas is flowing. At the end of the shutter speed, the distributor 9 is switched to position b, shut off valve 6, disconnecting product 10, and open valve 14. The gas expands and displaces the liquid from tank 15 into measuring container 13. Leakage is determined by the following relationship:

V v

V cl

p 1 / p

(- ™ d1 {4-,

sp

where V. is the volume of fluid displaced,

Noah in JJ measuring capacity; Ratm is the absolute pressure in the measuring capacity 13 (atmospheric);

P is the absolute value of the test pressure;

n - coefficient popitropy.DO

The value of the polytropic coefficient is found from the preliminary calibrations, feeding into the pipeline between the distributor 9 and the capacity of 15 measuring portions of gas and determining the amount of output 5

inhibited fluid. With the same test pressure (rs.tm / RCSP) °° const, therefore - k Vf (1, i.e., the relationship for determining leakage is linear.

The proposed method, by ensuring that the gas expansion processes are identical when testing a large range of different products, makes it possible to increase the reliability of determining the leakage rate. More objective control reduces overhead in production and operation associated with finding and eliminating leaks.

Claims (1)

Invention Formula Method of testing products for leaktightness by supplying a fluid under test pressure to a product cavity, connecting the product cavity through a pipeline to a gas source under the same test pressure, disconnecting the pipeline from the gas source through holding time and measuring the amount of fluid displaced into the measuring capacity connected to the atmosphere gas from the pipeline, which is judged on the leakage of the product, characterized in that, in order to increase reliability by providing a constant indicator of political s gas expansion process for articles of different sizes, while the product is connected to the pipeline control volume filled with fluid at atmospheric pressure is disconnected the product of the pipeline simultaneously with the detaching of the latter from the gas source and connected to control the volume of the cavity with the measuring vessel and the pipeline. Lit 13