Full-frequency-band variable-structure hydraulic filtering device

Abstract

The invention relates to a full-frequency-band variable-structure hydraulic filtering device. An input pipe and an output pipe of the device are connected to the two ends of a shell correspondingly, an S-shaped elastic thin wall is mounted in the shell, and an S-shaped cavity filter is jointly formed by the input pipe, the output pipe and the S-shaped elastic thin wall; a series resonant cavity I and a parallel resonant cavity are formed between the S-shaped elastic thin wall and the shell; a series resonant cavity II is arranged outside the series resonant cavity I, and the series resonant cavity I and the series resonant cavity II communicate through a conical inserting pipe. H-type filters are located in the parallel resonant cavity and communicate with conical variable-structure damping holes, and series H-type filters are located in the series resonant cavity I and the series resonant cavity II and also communicate with the conical variable-structure damping holes. The H-type filters and the series H-type filters are symmetrically arranged in the axial direction and form series-parallel H-type filters. The full-frequency-band variable-structure hydraulic filtering device can attenuate pulsating pressure of the high frequency band, the medium frequency band and the low frequency band in a hydraulic system, and therefore the self-adaptive filtering effect on all-frequency-band working conditions is achieved.

Description

【Technical field】 [0001] The invention relates to a hydraulic filter device, in particular to a hydraulic filter device with variable structure in all frequency bands, belonging 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 e...

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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