SU1216693A1 - Arrangement for testing article tightness - Google Patents

Abstract

The invention relates to leak testing of products and allows to increase the sensitivity of tests by adjusting the level of the liquid between the measuring circuit electrode and the capillary in the control tank. By means of the bellows of the regulating vessel, the end of the capillary is freed. After equalizing the pressures in the control tank and the control tank, the end of the capillary in which the liquid meniscus is formed is flooded with the aid of the latter, and the end of the measuring circuit electrode, which becomes closed. Air from the leakage from the product enters the capillary, forming bubbles at its end and opening the measuring circuit between the coaxially mounted capillary and the electrode. 1 hp f-ly, 1 ill. i (L a 05 (x)

Description

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This invention relates to leak testing of products.

The purpose of the invention is to increase the sensitivity.

The drawing shows a diagram of a device for testing products for tightness.

The device contains a sealed control tank. 1 with an outlet nozzle 2, which is connected to a hermetic control tank, made in the form of a syphon 3 to set the level of the liquid in the tank 1, and to the inlet pipe 4 between

The shut-off valve 5 of the compressed gas source b, for example, air connected to the product 7 through the valve 8., is connected to the reservoir 1 by an airtight container with an electrically conductive liquid, made in the form of a cable 9 installed coaxially to the bellows 3. interconnected plates 10 attached to one of their ends. To the other ends of the bellows-3 and 9, the attachment-foam is placed between them a movable plate 11 with a mechanism for its movement, made in the form of an eccentric convector 12,

The tank 1 houses one end of the measuring tube, made in the form of a capillary 13 passing through its bottom, the other end of which is connected to a source 6 of compressed gas. Coaxially the capillary 13 in the tank 1 has an electrode 14 with an insulating tube 15 of the measuring circuit 16.

A leak test device works in a skinny manner.

The valves 5 and 8 are opened, the handle of the eccentric method 12 is turned, the ci-shyphone 9 is extended and the bellows 3 is simultaneously compressed. Part of the liquid from the tank 1 enters the bellows 9, and the air of the bellows 3 enters the tank 1 above the liquid. The end of the capillary 13 is freed from liquid. After the pressure is equalized, the valve 5 is closed, the measuring circuit 16 is open at the same time,

The bellows 9 is compressed by an eccentric drive 12, while the fluid flows back into the reservoir 1 and floods the end of the drop cap 13, in which ifipasyeTCH the meniscus of the fluid and the end

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electrode 14, the measuring circuit 16 is closed.

If the product 7 is hermetically sealed, then air from the source 6 is not in the p 13 (5 enters, the measuring circuit 16 remains in the closed state.

If the product 7 is not hermetic, the pressure in its cavity decreases, the air from the source 6 enters the cavity of the capillary 13, forming bubbles at its end. At the same time, with the passage of each bubble, the meter — on circuit 16 is opened,

Depending on the magnitude of the leak 15, adjust the measuring circuit 16, for example, by transferring it to self-locking, to read bubbles.

After completing the tests of each product 7, liquid is withdrawn from tank 1 into bellows 9.

The invention makes it possible to increase the sensitivity of the tests, since the coaxial arrangement of the electrode and the capillary, at the end of which forms only a conductive meniscus

fluid, allows to register. leakage commensurate with the bubble ga0

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the liquid allows to regulate the interaction of the capillary and the electrode, i.e. measured leakage.

Claims (2)

1. Device dp of product testing for tightness, containing a hermetic control tank with an outlet nozzle, a container connected to it with an electrically conductive liquid and a regulating tank for a Dani liquid level in the control tank, a source of compressed gas with a supply pipe for connecting to the product, a measuring tube , one end of which is placed in the control tank, and a measuring circuit with an electrode placed in the control tank, characterized in that, in order to increase the sensitivity STI, the measuring tube and another end connected to a source of pressurized gas is formed in the form of passing through the bottom of the reservoir controlling the capillary, an electrode measuring chain is mounted coaxially capillary, the outlet is connected with the regulating capacity and with a supply conduit posredstvomL 1D11M the shut-off valve, and the container with the electrically conducting liquid and the regulating capacity are made tight with the possibility of regulating the volumes of their cavities. 2. The device according to claim 1, of which is based on the fact that the container with an electrically conductive liquid and regulator The casting tank is made in the form of coaxial bellows, and the device is equipped with plates rigidly interconnected, each of which is attached to one of the ends of the bellows installed between them, and a movable plate with a mechanism for moving it between the bellows and attached to their other ends.