SU1677549A1 - Device for check of tightness of articles - Google Patents

Abstract

This invention relates to a technique for monitoring leaktightness of products by a monometric method. The device allows you to automatically set the test pressure within the specified limits. The device contains an injection line 1 with an inlet valve 2, a pressure transducer 4 connected to a measuring device 5 including a two-level threshold element, the outputs of which are connected to the control input of valve 2. The levels of the threshold element correspond to the maximum and minimum permissible pressures. The device also contains a temporary block 7 connected to the measuring device 5 and the control input of the valve 2. When filling the product 8 and reaching the maximum pressure on the signal from the measuring device and 5, valve 2 closes. If, during the stabilization process, the pressure drops below the minimum threshold of the signal from device 5, valve 2 opens and the filling process is repeated. At the end of the stabilization phase, the time block gives the command to block the valve 2 in the closed position and to start the test, during which the device 5 registers the pressure drop. 1 il. (L

Description

The invention relates to techniques for monitoring the tightness of products specifically by the manometric method.

The purpose of the invention is to increase the accuracy of control and simplify the design, especially to set the test pressure and combine the functions of the measuring device to set the test pressure and control the tightness.

The drawing shows a schematic 1 diagram of the device.

A device for monitoring the tightness of products contains a discharge line 1 with an inlet valve 2, a drain line with a drain valve 3, and a pressure transducer 1 4 connected to the measuring device 5. The measuring device 5 includes a two-level threshold element, the outputs of which through the relay unit 6 are connected to the control input Valve 2. Levels ί of the threshold element correspond to the maximum and minimum allowable pressures. The device also contains a time block 7 connected to the measuring device 5 and the control inputs ί of valves 2 and 3.

The device operates as follows.

The inlet valve 2 of line 1 opens. pressure, and the test gas enters изделие into the product 8. The pressure transducer 4 connected to the product 8 generates a signal supplied to the measuring device 5. When the maximum allowable pressure is reached by the signal from 'measuring device 5, the valve 2 closes and the time block 7 is turned on, which sets the time of the pressure stabilization process. During the time of this phase, a decrease in pressure occurs from cooling of the gas and its penetration into the product material. If the minimum permissible pressure is reached by a signal from the measuring device, valve 2 opens and the process of filling the product 8 with a groove is repeated.

At the end of the stabilization process, the time block gives a command to block valve 2 in the closed state and assigns a monitoring time during which the measuring device 5 registers a pressure drop indicating a leak in the product. At the end of the monitoring time, the time block 7 gives a command to open the drain valve 3 and depressurize the product 8.

Claims (1)

Claim A device for monitoring the tightness of products, containing a discharge line with an inlet valve, a test line with a pressure transducer, a drain line with a drain valve, a temporary unit whose inlet is connected to the pressure transducer, and the first outlet is a control inlet of the drain valve, and a measuring device that differs the fact that, in order to simplify the design and improve accuracy, the measuring device is connected to a pressure transducer and includes a two-level threshold element, the outputs of which and the second output are time The unit is connected to the control input of the intake valve.