SU413390A1 - - Google Patents

Description

one

The invention relates to the field of leaktightness testing of objects under the excess pressure of a test gas, for example, gellies, on whose surface being tested OR OR around which a closed hermetic cavity can be created with a piston, suction cups OR detachable vacuum chambers.

Devices for monitoring the tightness of objects are known, comprising a leak detector, a fore vacuum pump, a vacuum manifold associated with them, a line for connecting the object to be monitored to a vacuum collector, and a control panel.

The proposed device differs from the known ones in that the OIO is equipped with an electromagnetic valve installed in the pipeline, and the vacuum manifold is made in the form of two pipelines connected to each other through an electromagnetic valve, one of which is designed to create a low and the other a high vacuum.

In such an embodiment, the device allows to control an object or its place, at the same time to produce a blank for control, i.e., preliminary pumping out to a low vacuum of other objects or their places, which significantly reduces the time for conducting the control.

Cha FIG. 1 shows a diagram of the connection of the individual elements of the proposed device; in fig. 2 is a block diagram of the control panel.

Separate pumped volumes 1, made in the form of suckers or detachable vacuum chambers, are installed at checked places with the help of creeps 2 and 3, through electromagnetic valves (EHR) 4 in the number of controlled objects connected to the low-vacuum pipeline 5, the pressure in which is measured sensor 6, OR to the high-vacuum pipeline 7, the pressure in which is measured by the sensor 8.

The operation of the EHR is carried out

in the control panel 9, where the signal 10 comes from the pressure sensor installed in the vacuum system of leak detector I. A high-vacuum pipeline 7 is pumped out through the EMC 12. To maintain the optimum pressure in the vacuum system of the leak detector 11, an electrically controlled leak detector 13 with a gas cylinder 14 is installed . The foreline pump 15 pre-pumps the entire device. Control signals from leaks on objects and from control diagrams. Changshaeus samonists 16. With Pu nuga unravlepn 9 through the wires 17, 18, 19 signals are received adjust the sensitivity of the leak detector 11,

switching it on, as well as turning on the EMC 12 for pumping the high-vacuum pipeline 7. In the control panel 9, a block of electronic vacuum interlock relays (ERW) of low vacuum 20, optimum pressure 21, limit vacuum 22, block 23 of automatic pressure control, block of electronic time relays (ERV ) 24 rejection of volumes 1, block 25 for switching on software mechanism 26, block 27 for switching on the recorder 16, block 28 for switching on the leak detector 11 and block 29 for adjusting the sensitivity.

In pumped volumes 1, a low vacuum is created by the pump 15 through pipeline 5 and the EMC 4. After the required vacuum has been reached, the ERVB 20 is triggered, preparing the program mechanism 26 for operation and switching the pipeline 7 to the high vacuum pump of the leak detector 11, for which the EMC switches. 12. After switching on the software mechanism 26, the pumped volumes are sequentially connected to the leak detector 11, pumped out to the limit vacuum, which is fixed by the block 22, then the optimum pressure is established by the block 23 together with the leak valve 13, which injects the necessary amount of gas, for example nitrogen, from the cylinder 14 into the vacuum system.

Block 22, in addition, stops the operation of the ERV 24, which at leaks of volume 1 (which is expressed in the impossibility of reaching the limiting vacuum at a given time), gives a command to go to the next volume and starts block 28, Blyuka101TII11 detector 11. When block 21 and the block are triggered 28, block 27, which turns on the recorder 16, goes down, and after writing through block 25, turns on software mechanism 26 to go to the next volume.

The recorder 16 records the signal of an object leak or a control leak, removed from the leak detector 11, depending on the command of the program mechanism 26, which non-periodically sends a command to adjust the sensitivity of the leak detector 11. The signal from the control leak is fed from the output device of the leak detector 11 to the block 29, which is modified operating modes (e.g., emission current) of a leak detector adjusts its sensitivity to obtain a given signal from a test leak, which is built into one of the pumped volumes. Rejected volumes due to leaks may

removed and repaired during the inspection. After the control, volumes are swapped to other objects or parts of it, and the monitoring cycle is repeated. Permutation of volumes can be carried out,

not waiting for the end of control of the entire surface of the product, which makes it possible to obtain a continuous test cycle.

Subject invention

A device for semi-automatic coptrol of the leaktightness of objects, containing a leak detector, a forevacuum pump connected

there is a vacuum collector with them, a line for connecting the monitored object to a vacuum collector and a control panel, characterized in that, in order to reduce the monitoring time, it

fitted with a solenoid valve installed in the line, and the vacuum manifold is made in the form of two pipelines interconnected through the solenoid valve, one of which is designed

to create a low and another high vacuum.

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