Pressure self-adaptive broadband bag type hydraulic silencing device and method

Abstract

The invention belongs to the field of fluid vibration silencing, and discloses a pressure self-adaptive broadband bag type hydraulic silencing device and method. The device comprises an outer shell, an inner shell and a supporting shaft. The inner shell is sleeved with the outer shell, and a high pressure gas cavity is formed by the inner wall face of the outer shell and the outer wall face of theinner shell, the two ends of the inner shell are sealed by end covers, the supporting shaft penetrates through the two end covers and forms an expansion cavity with the two end covers and the inner wall face of the inner shell, and a rubber diaphragm which forms a low pressure gas cavity with the inner wall face of the inner shell is arranged in the expansion cavity. The supporting shaft is sleeved with a perforated sleeve, and external hydraulic oil can flow into the expansion cavity through the perforated sleeve. During working, the low pressure gas cavity can selectively communicate with the external atmosphere or communicate with the high pressure gas cavity or neither according to the gas pressure in the low pressure gas cavity and the working pressure of a hydraulic system. The method is realized by the device. The device has the advantages of wide silencing frequency band, small size and good silencing performance in the whole working pressure range of the hydraulic system.

Description

technical field [0001] The invention belongs to the field of fluid vibration silencing, and more specifically relates to a pressure-adaptive wide-frequency capsule hydraulic silencing device and method. Background technique [0002] The fluid vibration noise on the hydraulic pipeline has a major impact on the life of the system components and the external environment. The hydraulic muffler is a kind of muffler equipment that can effectively suppress the fluid vibration noise of the hydraulic pipeline. It is used in various hydraulic pipeline systems widely. [0003] At present, the common hydraulic mufflers on the market mainly include: resistive muffler, resistive muffler, compound muffler and capsule muffler. Among them, the resistive muffler refers to the built-in resistive material (such as muffler cotton, carbon fiber and foam, etc.) The muffler suppresses vibration and noise through the reflection and interference of waves inside the muffler; the composite muffler is...

AI Technical Summary

Problems solved by technology

Among the above-mentioned mufflers, the capsule muffler is more suitable for suppressing the fluid vibration noise in the hydraulic pipeline. The reason is that the resistive muffler is easy to block after a period of use and the increase in the temperature of the hydraulic oil will destroy the resistive muffler structure. And the resistive muffler is mainly to suppress the vibration and noise of medium and high frequency; when the resistive muffler is used to suppress the vibration and noise of the hydraulic pipeline, its structure is large, the installation space is often limited, and its muffler frequency band is narrow; while the capsule type The muffler is small in size, good in noise reduction performance and wide in noise reduction frequency

However, although the existing bladder muffler has good noise reduction performance, it can only have good noise reduction performance within a certain range of system working pressure. It has good noise reduction performance in the range

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