Liquid-gas type vibration absorber

Abstract

The invention relates to a liquid gas type shock absorber, which consists of an upper connector, a spline external cylinder, a cylinder sleeve, a mandrel, a piston, a falling protection connector and a lower connector. The shock absorber is basically characterized in that the upper connector is connected with the spline external cylinder through a spline; the external cylinder of the shock absorber consists of the spline external cylinder and the cylinder sleeve; the mandrel and the piston are arranged inside the cylinder sleeve and are connected with the upper connector through thread; and the falling protection connector is connected with the cylinder sleeve and the lower connector through thread. According to the characteristic that the volume of gas changes along with the change of the temperature and pressure, the shock absorber adopts gas as an elastic element and has better shock absorbing performance. Simultaneously, liquid is taken as a pressure transfer element, thereby not only improving the stability of the shock absorbing system, but also carrying out the liquid sealing of the gas and consequently improving the tightness of the cylinder. The shock absorber has the advantages of wide application range, good flexibility, low impact, good stability, and the like.

Description

technical field [0001] The invention relates to a liquid-pneumatic shock absorber used in drilling engineering. Background technique [0002] This type of shock absorber in the prior art has the following patent documents to disclose. [0003] Chinese patent specification CN 85 2 02386 U (announcement on May 21, 1986) describes the hydraulic shock absorber for automatic drilling, the sum of the thrusts of each stage of the shock absorber under the pressure drop of the drill bit nozzle is Under the action of this thrust, the drilling pressure can realize the automatic feed on the piston stroke, and the piston-hydraulic cylinder at all levels is also a shock-absorbing element. [0004] Chinese patent specification ZL200520002102.3 (authorized on March 29, 2006) describes an air mechanical shock absorber suitable for underbalanced air circulation drilling, including a splined mandrel, a splined barrel, a disc spring barrel, a disc The shock absorber adopts the mechanical work...

AI Technical Summary

Problems solved by technology

However, it is difficult to achieve the purpose of shock absorption by using the existing common shock absorbers, and there is an urgent need for a shock absorber with stronger applicability.

[0008] The various types of shock absorbers mentioned in the above literature have their own advantages, but they also have their own limitations. The hydraulic shock absorber has the characteristics of good stability, but the compressibility is small, the change range is small, and the shock absorber has its own advantages. The shock effect is general; the mechanical shock absorber has a wide application range and can be used for gas drilling, but the service life is short; the shock absorber that uses the volume change of gas with temperature and pressure changes has good flexibility, large change range, and good shock absorption effect. Good characteristics, but large impact, poor stability; therefore, there is an urgent need for a new type of shock absorber with good flexibility, wide application range, good stability and long service life. The present invention is proposed according to the above technical background

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