SU761867A1 - Apparatus for monitoring article tightness - Google Patents

Description

The invention relates to control / measuring technique and can be used to control the tightness of products. .

A device is known for monitoring the tightness of products, containing duffe ·· - a potential manometer, two stop and

control electropneumatic valves, a time block that controls' -valves [1].

The disadvantages of this device are the low performance of the control and its low accuracy.

The closest to the invention is a device for monitoring the leaktightness of products containing a preparation unit for the Test-groove, connected to the discharge line and testing with pneumatic equipment, a pressure relay, drainage and separating electropneumatic valves, connected to the output of the testing line, parallel connected differential pressure gauge and a bypass valve connected between the test line outlet and the separation valve (2).

This device does not provide high accuracy of control, and its adjustment is difficult and is carried out according to the graphs of the relationship between the volume of the test product and the leakage of the test pelvis depending on the pressure drop. Besides tggo, relay

2

pressure gives the command ’to the subsequent operation regardless of whether the product is subject to further verification or not, which reduces the performance of the device.

The purpose of the invention is to improve the accuracy of control and nrey’znadatydkyyyuzh * ^^ solutions.

"For this purpose, the device is equipped with series-connected (flow meter, throttle and electro-pneumatic valve connected to the outlet of the discharge line, and a temporary unit that interacts with

pressure switch.

15 The drawing shows the proposed device. · one

It contains the test gas preparation unit 1, to which the discharge line 2 is connected and, test line 3,

20 pressure relays 4, drainage electropneumatic valve 5, separation electropneumatic valve 6, test product 7, series-connected electropneumatic valve 8, throttle 9 and flow meter 10, connected to outlet 11 of discharge line, parallel-connected differential pressure gauge 12. And bypass electropneumatic ..... .. valve 13 connected between outlet 1Ί

'lines 5 test and dividing®'

³⁰ electric pneumatic valves \ 6, and temporary

761867

......; .....- - 37 "FF:; UVFUΕ'Ε '2

block ("a drawing not shown), interacting with relay 4. pressure (s.

The device works as follows. - '' · ..:> '.

The test gas is fed through block 1. 1. into the discharge line 2 and test line 3. ' P.5! Ez'moa ^: Pt1a | p1 (m ^ p'a of lines 2 to 3 ensures (higher output pressure is in the line of pressure). At the same time, its output 44, and the product

"is filled with test gas," the command to the subsequent stabilization operation issues a pressure switch 4 and a time block. ..If within the time specified by the time block, the pressure switch does not

“a signal will be received that a pressure of a given level has been reached in the tested product, the time block generates a signal for intermittent testing. Stabilization occurs at the closed output 1.1, open electropneumatic valves 5 and 6 open you> during 14 \ The time of the stabilization phase ^{4 is} determined by the time block. During this time, in line 3 of the test and product 7, the bubble / HANDyt pressure equalization and set its required value. The pressure is released into the atmosphere with the help of in-line apparatus 3 of the test.

After stabilization, test gas of the timeblocker. Closing the output 14 of the test line 3 and the bypass electropneumatic valve 13, after that the leakage is measured with the help of the differential pressure gauge 12 for the time specified by the time block. At the end of the control, the time block issues a comaagda to close the electropneumatic isolating valve 6 and open the output 14 of line 3 to test the electric pneumatic valves 5 and 43. Pressure is released from product 7 and pressure equalization in the chambers of the differential pressure gauge 12. ¹ "

Setting up the device and checking its operation during operation is carried out on the reference part connected

'· four

instead of the product 7 to the outlet 11 line for oppression. ··

In the “leakage measurement” phase, an electropneumatic valve 8, and. With the help of ⁵ throttle 9 and the flow meter 10, the value of permissible leakage is established in accordance with the technical requirements for the product under test.

The invention allows to improve the accuracy of leakage control and device performance, and also provides the ability to quickly changeover the device for testing various products and

15 control of the operation of the device itself during the testing of similar products.

Claims (1)

Claim A device for monitoring the tightness of products, containing a test gas preparation unit connected to it / a type of yoke with an inverter 25, a pressure switch, a drainage and separation electric pneumatic chalanges, • connected to the outlet of the discharge line, parallel connected differential matsometr and bypass valve, included between the output of the test line and - separation valve, .. differing ¹ 'in that, in order to increase, control accuracy and performance, set | It is equipped with a series 35 connected by a flow meter, a choke and an electric pneumatic valve connected to the outlet of the discharge line, and a time unit interacting with the pressure switch. . . 40 1-y.; ..... /.