Method and structure of preventing sealing rings of valve rod from falling off

Abstract

The invention discloses a method and structure of preventing sealing rings of a valve rod from falling off. The method comprises the steps that a sliding sleeve (4) is arranged outside the valve rod in a sleeving mode, a sliding sleeve hole (7) is formed in one end of the sliding sleeve (4), and the internal diameter of the sliding sleeve hole is equal to that of a valve port (8); when percussionis conducted, the sealing rings (1) at the end of the valve rod (3) retreat from the valve port (8), then the sealing rings (1) enter the sliding sleeve hole (7), the valve rod (3) and the sliding sleeve (4) synchronously move towards a gas chamber (10) and are separated from an end face (11) of the valve port (8) to percuss a sound source control valve; and due to the fact that the sealing rings(1) are located in the compressed state all the time in the whole percussion process, the sealing rings (1) are prevented from being squeezed out of sealing grooves in the end of the valve rod (3) orbeing broken in a blowing mode by the high-pressure gas. By the adoption of the method and structure, the sealing rings on the valve rod are kept in the compressed state all the time, and therefore the problem that the sealing rings are separated from the sealing grooves of the valve rod is solved, and the applicability and the reliability of an instrument are improved.

Description

technical field [0001] The invention relates to a method and a structure for preventing a sealing ring of a valve rod from falling off, and belongs to the technical field of oil well liquid level depth testing equipment. Background technique [0002] The wellhead connector is a sound-emitting and receiving sound-wave device used for oil well liquid level testing in the oil recovery process. The depth of the oil well liquid surface can be calculated by receiving and processing the sound waves, and the mechanism that generates sound waves in the wellhead connector is the sound source control valve. The sound source control valve isolates the gas chamber from the bushing through the valve stem, and the limit rod of the valve stem is opened during the test, and the valve stem moves axially under the action of the spring force and gas pressure, using the pressure difference between the gas chamber and the bushing A pulsed acoustic signal is emitted. The pressure range of conven...

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a method and structure for preventing the valve stem sealing ring from falling off, so as to solve the problem of the sealing ring falling out of the valve stem sealing groove, and improve the applicability and reliability of the instrument, thereby overcoming the disadvantages of the prior art. insufficient

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