SU1606895A1 - Device for determining air-tightness of collar seal - Google Patents

Abstract

The invention relates to a test technique and makes it possible to increase the information content by separately determining the tightness of the inner and outer jaws. The device includes covers 1, 3, hermetically mounted on the wall 2 of the housing. In the cover 3 there is a slot for fitting the cuff. Ring latch 5 is hermetically mounted on the cover 1 and the beveled end facing the cylindrical surface of the socket or wall 2, contacts alternately with a corresponding sponge. On one side of the socket, a pressure of the control medium is created, and on the other, a leak meter is installed. The fixer 5 first fixes the inner sponge, creates a pressure of the control gas and determines the magnitude of this pressure at which the leak meter shows leakage through the outer sponge. Then the fixer 5 fixes the outer sponge and the control operations are repeated. 1 il.

Description

The invention relates to a testing technique and can be used to control the tightness of a lip seal with developed external and internal jaws.

The purpose of the invention is the expansion of information by separately determining the leakage of the inner and outer jaws.

The drawing shows a diagram of a device for determining the tightness of a lip seal.

The device includes a first cover. 1, a side cylindrical wall 2, a second cover 3 with a socket for a cuff 4, an annular retainer 5, and elastic o-rings 6. The cuff 4 is mounted on a cylindrical protrusion and an annular surface of the second cover 3, with an outer lip in contact with a side wall 2 that is screwed onto a cover 3 and is provided at the junction with a C. sealing ring 6.

On the first lid 1, an annular retainer 5 is hermetically mounted by the first end face by means of a thread, equipped with an annular stop for clamping the jaw, which is made in the form of a bevel on a conical surface. The annular retainer 5 for preloading the inner lip of the cuff 4 is equipped with openings for the passage of working gas, which comes from under the expanding outer lip of the cuff 4, and the bevel is facing the cylindrical surface of the socket. The first cover 1 is connected by thread to the side wall 2 and is provided with a sealing ring 6. The neck of the cover 3 is connected to a pipe for supplying test gas (not shown), and the neck of the cover 1 is connected to a pipe of the device for recording leakage (not shown) . The bevel of the ring retainer 5 when preloading the outer jaw is made towards the wall 2.

Pipelines are connected, for example, using union nuts.

The device operates as follows.

The device is assembled according to the diagram shown in the Drawing, controlling the guaranteed pressing by the emphasis of the ring retainer 5 of one of the lips of the cuff 4 to the sealing surface. A pipe from the test gas source is connected to the neck of the valve 3 and equipped with a pressure gauge equipped with a scale with the necessary calibration accuracy, and a pipe connected to the neck of the cover 1 is connected to a device for recording depressurization, for example, by a leak meter with the given accuracy of determining the concentration of the test gas. After that, starting from a certain initial small pressure value, a test gas is supplied to the sealed cavity 7. With a smooth increase in pressure, the test gas, passing through the channel 8 under the base of the cuff 4, when it reaches a certain value, squeezes the test sponge of the cuff 4 and enters through the holes of the ring retainer 5 (or directly) into the sealed cavity 9 of the housing, from where it enters the pipe through the neck leak meter. At the time of registration depressurization. the junction of the sponge with the surface to be sealed using a leak meter marks the pressure gauge. The pressure recorded on the pressure gauge corresponds to the average pressure of the sponge being pressed against the sealing surface.

After determining the preload pressure of one sponge, the annular retainer 5 is changed and 55 another sponge is similarly tested. Then, the compression pressure values for both jaws are compared and a conclusion is made on the appropriateness of using this cuff 4. ί The proposed device allows 40 to separately determine the compression of the outer and inner lips of the cuff 4, i.e. the minimum pressure at which the lip seal loses its tightness, and the compression pressure of the sponge considered critical. The degree of tightness of both jaws allows us to testify to the constructive perfection and rationality of the use of the cuff 4.

In addition, the application of the proposed device provides testing in the full range of possible measurement accuracy, depending on the application of the test medium and the instrument for recording leakage, and also allows testing a wide range of cuffs 4 due to the use of lateral cylindrical walls of various sizes.

Claims (1)

Claim A device for determining the tightness of a lip seal with inner and outer lips, containing a cylindrical body, a first cover, q sealed on the body, a second cover with a seal socket, a control pressure source connected through a groove in the second cover with a socket, a flow meter, and 15 with a body cavity between the covers, characterized in that, in order to expand the information content by separately determining the leakage of the inner and outer jaws, the second cover is fixed to the housing everything is hermetically sealed, and the device is equipped with an annular clamp made in the form of a hollow cylinder, one end sealed on the first lid coaxially with it and having a bevel on the second end facing the cylindrical surface of the lid or the side of the inner wall of the housing, as well as having a through hole in the wall when the bevel is facing the nest.