考虑曲柄连杆比影响后的钻井泵空气包动力学研究

Study of Well Drilling Pump's Air Dynamics Accumulator with the Effects of Crank-Link Rod Ratio Considered

在考虑了曲柄连杆长度比值影响以后,给出了三缸单作用钻井泵流量的傅立叶级数表达式.在计及排出管线和导管中液体惯性及导管中阻力损失的情况下,建立了钻井泵空气包动力学模型,求出了空气包以后排出管线中流量的表达式.文章分析了影响流量脉动衰减系数的几个因素,给出了空气包最小体积的设计依据,并认为由于获得最小脉动的气包体积受泵工况及谐波次数的影响,难以作为设计依据.还比较了理论剩余体积和真实剩余体积,认为二者相当接近.文章最后指出,在现有钻井泵的实际工况下,空气包的常规计算方法完全可以应用.

: Fourier progression expression of flowing rate for the drilling pump with three single functional cylinders is put forward. The dynamic mechanical model of the drilling pump's air accumulator was established with the fluid inertia in the drain pipe and guide pipe and the resistance losses in the guide pipe considered. The expression of the flowing rate in the drain pipe behind the air acumulator was evaluated. The factors affecting the pulsation attenuation of flowing rate were analysed and the basis for designing the minimum volume of the air accumulator is given out. It is held that as the air accumulator's volume with minimum pulsation is affected by the pump's working conditions and the times of harmonics,it can hardly be used as the basis for designing the air acumulator with minimum volume. The theoretical residual volume and practical residual volume were compared and they are considered to be close to each other. In the end, the paper points out that under the present working conditions of the drilling pumps,the conventional computing method of the air accumulator can be used as well.