Variable structure working condition self-adaptive hydraulic filtering method

Abstract

The invention relates to a variable structure working condition self-adaptive hydraulic filtering method. According to the method, the high-frequency pressure pulsation of a hydraulic system is attenuated by an S-shaped cavity filter; the high-frequency pressure pulsation in the hydraulic system is weakened by vibration of elastic thin-walled forced machinery; a plug-in type spiral heterogeneous series connection H-shaped filter has a good filtering effect on pressure pulsation at low and medium frequency bands; and accordingly full-spectrum pressure pulsation filtering is achieved. The axial length of the filter is designed to be larger than the wavelength of pressure pulsation; the three filtering structures in the filter have the same pressure pulsation attenuation effect within the axial length range, and the filter is made to have the working condition self-adaptive capacity. The axial directions of the three filtering structures are the same as that of the filter, and the large dimensions also guarantee the filtering performance of the hydraulic filter. Pressure pulsation is adapted automatically; and the structure of the filter is changed along with the pressure variation, so that pressure loss of filtering is reduced, and the influence of filtering on hydraulic stiffness is lowered.

Description

【Technical field】 [0001] The invention relates to a hydraulic filtering method, in particular to a variable-structure working condition self-adaptive hydraulic filtering method, which belongs to the technical field of hydraulic equipment. 【Background technique】 [0002] The hydraulic system has the characteristics of high power density and good operation stability, and has been widely used in the engineering field. With the development of hydraulic technology towards high pressure, high speed and large flow, the influence of pressure pulsation inherent in hydraulic system is becoming more and more prominent. Relevant studies have shown that when the pressure pulsation amplitude exceeds 10% of the working pressure of the hydraulic system, the pipeline will form a higher pressure and cause damage to the pipeline system; when the pressure pulsation amplitude exceeds 2-10% of the hydraulic system working pressure , pipelines and valves will wear and tear, endangering the reliab...

AI Technical Summary

Problems solved by technology

But the current resistance filter has the following disadvantages: (1) The pressure pulsation in the hydraulic pipeline is a function of time and position, and the hydraulic filter installed in the position cannot adapt to the variable working conditions; (2) the resistance filter is only suitable for Specific frequency points and narrow frequency bands have good filtering effects, and broad-spectrum filtering cannot be achieved; (3) The attenuation effect of hydraulic filters on pressure pulsations is not ideal; (4) There is no filtering effect on flow pulsations

The filtering effect of the vibration damping muffler of this patent is closely related to the radius and thickness of each filter unit on the elastic thin plate. Since there are multiple filter units on the elastic thin plate to achieve broad-spectrum filtering, the radius and thickness of each unit are different. It is limited, so it affects the filtering effect; at the same time, the vibration damping muffler of this patent does not solve the problem that the pressure pulsation changes with the position, and the adaptability to changing working conditions is not good; it has no filtering effect on the flow pulsation

Images