Hydraulic filtering method self-adaptive to working conditions

Abstract

The invention relates to a hydraulic filtering method self-adaptive to working conditions. According to the hydraulic filtering method self-adaptive to the working conditions, a double-pipe insertion type filter is used for attenuating the high-frequency pressure pulsation of a hydraulic system; forced mechanical vibration of an elastic thin wall is used for weakening the high-frequency pressure pulsation in the hydraulic system; series-parallel connection type H-shaped filter sets have a good filtering effect on the pressure pulsation under the medium-frequency band and low-frequency band conditions; and in this way, filtering of the pressure pulsation under the full-frequency-spectrum conditions is achieved. The axial length of the filter is designed to be larger than the pressure pulsation wavelength, three filtering structures in the filter have the consistent pressure pulsation attenuating effect within the axial length range, and thus the filter is made to have the capacity to be self-adaptive to the working conditions; the axial dimensions of the three filtering structures are consistent with the axial dimension of the filter, and the filtering performance of the hydraulic filter is also guaranteed even if large dimensions are adopted; and the hydraulic filtering method is self-adaptive to the pressure pulsation, the structure of the filter changes along with the change of the pressure, the filtering pressure loss can be reduced, and the influence of filtering on the hydraulic rigidity is reduced.

Description

【Technical field】 [0001] The invention relates to a hydraulic filtering method, in particular to a working condition adaptive 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 hydrau...

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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