An adjustable frequency adaptive airflow pulsation attenuator

Abstract

The invention discloses a frequency-adjustable self-adaptive gas pulsation attenuator. The frequency-adjustable self-adaptive gas pulsation attenuator is based on the principle of a Helmholtz resonantcavity, and attenuation of gas pulsation reduces the pneumatic noise. The gas pulsation attenuator is mainly composed of a hydraulic cylinder, a hydraulic piston, a hydraulic rod and a driving device. The hydraulic piston and the hydraulic cylinder form a cavity body of the Helmholtz resonant cavity, and the hydraulic rod and the hydraulic cylinder form a damping passage of the Helmholtz resonantcavity. The hydraulic piston is driven to axially move in the hydraulic cylinder by adjusting the liquid charge in the hydraulic cylinder or a stepping motor in a mechanical driving device by a loadsolenoid valve and an unload solenoid valve in a hydraulic driving device. According to the change of the excitation frequency of the gas pulsation, the inherent frequency of the gas pulsation attenuator is adjusted in real time so as to ensure that the inherent frequency of the gas pulsation attenuator can track the excitation frequency of the gas pulsation in real time to enable the inherent frequency of the gas pulsation attenuator to be always consistent with the excitation frequency of the gas pulsation, resonance is generated, the attenuation of the gas pulsation is achieved, and the pneumatic noise is reduced.

Description

technical field [0001] The invention belongs to the technical field of fluid machinery vibration reduction and noise reduction, and relates to an air flow pulsation attenuator that can adjust frequency and self-adaptively attenuate air flow pulsation and reduce aerodynamic noise. Background technique [0002] As a general-purpose equipment for changing gas pressure and transporting gas, fluid machinery, such as compressors, expanders and steam turbines, are widely used in petroleum, natural gas, chemical industry, metallurgy and other fields. During the operation of these fluid machines, periodic airflow pulsations will be generated, which will induce vibration and noise. In practical applications, the operating conditions of the fluid machinery will vary with the application, such as changes in the operating speed. Changes in the operating speed of fluid machinery will lead to changes in the excitation frequency of its airflow pulsation. Therefore, the excitation frequency...

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Problems solved by technology

[0004] In order to solve the problem that the attenuation effect of the airflow pulsation attenuator weakens or even disappears due to the large variation range of the excitation frequency of the airflow pulsation, the present invention provides a frequency-adjustable adaptive attenuation airflow based on the principle of the Helmholtz resonance cavity according to the excitation frequency of the airflow pulsation Airflow pulsation attenuator for pulsation reducing aerodynamic noise, used to attenuate airflow pulsation, suppress vibration excitation caused by airflow pulsation and reduce aerodynamic noise induced by airflow pulsation

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