Variable-structure hydraulic filtering method

Abstract

The invention relates to a variable-structure hydraulic filtering method. A C-shaped cavity filter is adopted for attenuating high-frequency pressure pulsating in a hydraulic system, forced mechanical vibration of an elastic thin wall is adopted for attenuating high-frequency pressure pulsating in the hydraulic system, and a series-parallel H-type filter set has the good filtering effect on the pressure pulsating of the medium frequency band and the low frequency band, so that full-spectrum pressure pulsating filtering is achieved. The axial length of filters are designed to be greater than the pressure pulsating wave lengths, and three filtering structures in each filter have the consistent pressure pulsating attenuating effect in the axial length range, so that the filters have the working-condition self-adaptive capacity. The axial dimensions of the three filtering structures are consistent with the axial dimensions of the corresponding filters, the relatively large dimensions of the three filtering structures also ensure the filtering performance of the corresponding hydraulic filters. The filters automatically adapt to pressure fluctuation, the structures of the filters change along with changes of the pressure so that the filtering pressure loss can be reduced, and the influence of filtering on hydraulic stiffness is reduced.

Description

【Technical field】 [0001] The invention relates to a hydraulic filtering method, in particular to a variable-structure hydraulic filtering method, and 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 reliability of the entire hydraulic syst...

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 of pressure pulsation changing with the position, and the adaptability to changing working conditions is not good

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