RU1529900C - Hermetic state checking device - Google Patents

Abstract

The invention relates to monitoring the tightness of small containers and allows to increase reliability by eliminating the effect of volume changes when moving the diaphragm of the differential pressure gauge. The device comprises a pressure source 1, a pipe 2 connected in series 2. a valve 3, a pressure supply line 4 with a pressure gauge 5. The first cavity of the differential pressure gauge. made, for example, in the form of a differential differential pressure measuring device (DUIPD) 6. connected through a valve 7 to the line 4. directly to the first cavity of the additional differential pressure gauge 8 and the product 9. The second cavity of the DUIPD 6 is connected through the valve 10 to the line 4 and with an additional capacity 11 directly. The second cavity of the differential pressure gauge 8 is connected through the valve 12 to the line 4. through the valve 13 to the atmosphere, through the valve 14 to the pipe 2 and the second additional capacity 15 directly. During control, the system is filled with gas from the pressure source 1, valves 7 are shut off. 10, 12. If there is a leak from the product 9, the diaphragm DUIPD 6 bends, and the diaphragm of the diaphragm 8 bends, respectively. The valve 13 opens, and some of the gas is vented from the second cavity of the differential pressure gauge 8 to equal readings DUIPD 6 and differential pressure gauge 8. 2 zp, f-ly, 1 ill.

Description

Joint venture

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The invention relates to a test technique and can be used to control the tightness of small containers with a manometric method.

The aim of the invention is to increase reliability by eliminating the influence of volume changes when moving the diaphragm of the differential pressure gauge.

The drawing shows a diagram of a device for tightness control.

The device comprises a pressure source 1, a pipe 2, a valve 3, a pressure supply line 4 with a pressure gauge 5 connected in series. The first cavity of the differential pressure gauge, made, for example, in the form of a differential pressure period measuring device (DUIPD) 6, is connected via valve 7 to line 4 and directly - with the first cavity of the additional differential pressure gauge 8 and the product 9. The second cavity of the DUIPD 6 is connected through the valve 10c to the highway 4 and directly with the additional capacity 11. The second cavity of the differential pressure gauge 8 is connected through the valve 12 to the line 4, through the valve 13 with the atmosphere, through the valve 14 - with the pipe 2 and directly with the second additional capacity 15.

The device operates as follows.

With open valves 10, 12 and closed valve 13, valve 3 opens and high-pressure gas from source 1 fills all the cavities of the system. When the specified test pressure, measured on the gauge 5 scale, is reached, valve 3 closes and after setting the zero values of the DUIPD 6 and differential pressure gauge 8, valves 7, 10, 12 are closed. After that, the system is kept under test pressure. When gas leaks from the product 9, the pressure drops, as a result of which the diaphragm ДУИПД b deviates to the left, the readings of its flaps increase, to compensate for the change in the volume of the left cavity of the system, valve 13 is opened and the gas from the second cavity of the differential pressure gauge B is vented to the atmosphere, while the diaphragm of the differential pressure gauge 8 will deviate to the right, increasing the volume of its first cavity. If the readings of the differential pressure gauge 8 and DUIPD 6 are equal, the volume of controlled

cavities are kept constant. In the case of overcompensation of the volume change, gas can be added to the second cavity of the differential pressure gauge 8 from the source 1 through the valve

14. In the event that the volumes of the Highways associated with the second cavity of the differential pressure gauge 8 are small, an additional tank 15 can be connected to it, stabilizing the smoothness of the pressure relief valve

thirteen.

The device allows to exclude the methodological error by eliminating the increment in volume when moving the diaphragm DUIP 6 and brings the final

result to the instrumental error of the differential pressure gauge equal to 0.5%, i.e. gives a ten-fold increase in precision control dozens of times.

Claims (3)

1. A device for monitoring the tightness, comprising a series-connected pressure source, a pipe, a valve and a first pressure supply line, a differential pressure gauge, the first cavity of which, designed to connect to the product, connected through a valve to the line, a variable-volume tank connected to the first cavity of the differential pressure gauge, the second pressure supply line connecting the second cavity of the differential pressure gauge and the first line, characterized in that, in order to increase reliability in the control of small-sized products by eliminating the influence of volume changes during moving the diaphragm of the differential pressure gauge, it is equipped with an additional valve mounted on the second line, the capacity of the variable volume is made in the form of an additional differential pressure gauge with a movable diaphragm, the first cavity of which is connected with the first cavity of the main differential pressure gauge, and the second cavity through the valves - with the main and the atmosphere. 2. The device pop. 1, distinguished by the fact that the second cavity of the additional differential pressure gauge is communicated through a valve with a nozzle. 3. The device according to paragraphs 1 and 2, except that it is equipped with two additional vessels in communication with the second cavities of the differential pressure gauges, respectively.