SU728012A1 - Device for fluid-tightness testing of articles - Google Patents

Description

The invention relates to the field of testing, and in particular to devices for controlling leak tightness by the accumulation method.

A device for monitoring the tightness of closed vessels, containing a test chamber and connected to it by one of its cavities, a leakage membrane indicator made in the form of a leakage adjuster and pneumorelayer with a five-membrane reacting organ [1]. .

However, the known device has low sensitivity and can only be used to control large leaks.

Also known is a device for monitoring the tightness of products, containing a chamber for placing products, an inkjet element with an indicator, a membrane gas flow separator with two nozzles aligned and located on both sides of the membrane, one of which connects the input cavity of the separator with the cavity of the chamber, and the other the output _e cavity of the separator with one of the output channels of the inkjet element [2].

The disadvantages of this device are low sensitivity, since the separator membrane operates in suboptimal conditions, and a limited range of controlled leaks.

The purpose of the invention is to increase the sensitivity of control and the expansion of the range of controlled leaks.

For this, the device is equipped with a pressure transmitter, storage capacity and. with a valve connected in series with each other and installed between the chamber and the inlet cavity of the separator, in the wall of the inlet cavity there are made inclined, diverging from the nozzle axis in concentric with respect to the nozzle axis in the direction of flow through them, through channels, one of which are located on the inner circle and connected to the pressure setter, and the rest are evenly distributed over the wall area and communicated with the atmosphere.

The drawing shows a device section

The device comprises a chamber 1, inside which a controlled product 2 is placed, a membrane separator 3 with a membrane 4 and two coaxially arranged nozzles 5 and 6, a storage tank 7, a valve 8, a pressure regulator 9 with a manometer 10, an inkjet element 11 connected to the indicator 12 (pneumatic lamp) through the amplifier 13. The nozzle 5 connects the cavity of the chamber 1 with the input cavity 14 of the separator 3, and the nozzle 6 connects the output cavity 15 of the separator 3 with one of the output channels of the inkjet element.

In the wall of the inlet cavity 14 of the separator 3, inclined circles are arranged that are located on concentric circles relative to the nozzle 5 and diverging from the nozzle axis in the direction of flow through them, through channels 16 located on the inner circle and connected to the pressure adjuster 9, and channels 17, walls evenly distributed over the area and communicated with the atmosphere. In the wall of the outlet cavity 15 of the separator 3, through channels 18 are made, communicating with the atmosphere.

The device operates as follows.

When applying gas under pressure. leakage is accumulated into the product 2 in the 'chamber 1 and the storage tank 7 with the valve 8 closed. The air flow supplied through the jet element 11 to the outlet cavity 15 of the membrane separator 3 through the nozzle 6, the membrane 4 is pressed towards the nozzle 5. From the outlet cavity air enters the atmosphere through the channels 18. On the other hand, the air flow supplied from the pressure setter 9 through the channels 16 to the inlet cavity 14, the membrane 4 is returned to its original or some other optimal position (by sensitivity to pressure drop s on it) at the peripheral channels 17, air is removed from the inlet cavity 14 of the separator

3. The oblique execution of channels 16 and 17 eliminates flow disturbances in the zone of nozzle 5.

After exposure to pressure of the product 2, open the valve 8, and the accumulated gas enters through the nozzle 5 into the inlet cavity 14 of the separator and, dramatically affecting the central

728012 4-th section of the membrane 4, deflects it towards the nozzle 6. In this case, the jet element 11 is triggered and a signal is detected through the amplifier 13 about the presence of leakage by the indicator 12.

An expanded range of controlled leaks is provided by adjusting the pressure setter 9 to various pressures with monitoring by a manometer 10.

Claims (2)

The invention relates to the field of testing, namely, devices for leak testing by accumulation method. A device for monitoring the tightness of closed vessels is known, which contains a test chamber and a membrane leakage indicator connected to it from one of its cavities, made in the form of a leakage detector and a haemorbore with a five-membrane reacting authority {1. . The known device has a low sensitivity and can only be used to control large leaks. It is also known a device for monitoring the tightness of products, comprising a chamber for positioning products, an inkjet element with an indicator. A membrane gas flow divider with two coaxially made roplets arranged on both sides of the membrane, one of which connects the inlet cavity of the separator to the cavity of the chamber, and the other - the outlet cavity of the separator with one of the output channels of the jet element 2. sensitivity is low, as the separator membrane works in non-optimal conditions, and there is a limited range of controlled leaks. The purpose of the invention is to increase the sensitivity of control and increase the range of controlled leaks. For this, the device is equipped with a control unit, a storage capacity and. the valve, connected between each other and mounted between the chamber and the inlet cavity of the separator, in the wall of the entrance cavity are made inclined concentric with respect to the nozzle, diverging from the nozzle axis in the direction of flow through them, through channels, one of which are located on the inner circumference and connected to the pressure setting unit, while the rest are evenly distributed over the wall area and communicated with the atmosphere. The drawing shows the device section. The device contains a chamber 1, inside which the controlled article 2 is placed, a membrane separator 3 with a membrane 4 and with two coaxially arranged nozzles 5 and 6, a collection tank 7, a valve 8, set pressure 9 with a pressure gauge 10, an inkjet element 11 connected to an indicator 12 ((main light) through amplifier 13. Nozzle 5 connects cavity of chamber 1 with input cavity 14 of separator 3, and nozzle 6 - output cavity 15 of separator 3 with one of the output channels of the jet element. In wall of input cavity 14 of separator 3 to centric with respect to the nozzle 5 circles oblique, the flow rate of the nozzle axis from the nozzle in the direction of flow through them, through channels 16, located on the inner circle and connected to the unit pressure 9, and channels 17, evenly distributed over the area of the wall and communicated with the atmosphere. In the wall of the exit cavity 15 of the separator 3, there are made through channels 18 that connect it with the atmosphere. The device works as follows. When gas is supplied under pressure, product 2 accumulates its leakage in chamber 1 and storage tank 7 when valve 8 is closed. Air flow through the jet element 11 to the outlet cavity 15 of membrane separator 3 through nozzle 6, the membrane 4 is pressed toward the nozzle 5. From the outlet cavity, air escapes through the channels 18. On the other hand, the air flow from the pressure unit 9 through the channels 16 into the input cavity 14, the membrane 4 returns to its original or some other optimal position (pb to the pressure drop on it), along the peripheral channels 17, the air is removed from the inlet cavity 14 of the separator 3. The oblique execution of the channels 16 and 17 eliminates flow disturbances in the area of the nozzle 5. After the pressure of the product 2 is opened, the valve 8 is opened and the accumulating gas flows through the nozzle 5 into the entrance cavity 14 of the separator and, having a sharp impact on the central part of the membrane 4, it deflects it towards the nozzle 6. At the same time, the jet element 11 is triggered and the leak signal is released through the amplifier 13 by the indicator 12. The open The controlled leakage is provided by adjusting the pressure setting device 9 to various pressures with pressure gauge control. 10. Invention A device for monitoring the tightness of products containing a product placement chamber, an ink jet element with an indicator, a gas separator with two coaxially formed diaphragms and located on both sides of the membrane nozzles, one of which connects the input cavity of the separator with the cavity of the chamber, and the other - the output cavity of the separator with one of the output channels of the jet element It is characterized in that, in order to increase the sensitivity of monitoring and expanding the range of monitored leaks, it is equipped with a pressure setting device, a cumulative capacity and a valve connected in series with each other and installed between the chamber and the inlet cavity of the separator. relative to the nozzle, the circles are inclined, diverging from the axis of the nozzle. in the direction of flow through them, through channels, one of which is located on the inner circle and connect they are not evenly distributed over the wall area and communicated with the atmosphere. Sources of information taken into account in the examination 1. USSR author's certificate in application number 2065198, cl. G 01 M 3/26, 1974, on which the decision to issue an author's certificate was made. 2. Sazhin S. G. et al. Automation of control, leaktightness of mass-produced products, Volgo-V tskoe publishing house, Gorky, 1977, p. 103 (prototype).