High pressure exhausting silencing apparatus

Abstract

Provided is a high pressure exhausting silencing apparatus, comprising a throttle pipe, a perforating inner pipe and a perforating outer pipe which are successively in coaxial cup joint from inside to outside. One end of the throttle pipe is used for air inflow, and the other end is provided with a radial through hole. The perforating inner pipe and the perforating outer pipe both have one end fixedly connected to the air inflow end of the throttle pipe; the throttle pipe, the perforating inner pipe and the perforating outer pipe all have the other end fixedly connected to a cover plate; a cavity for gas flow is respectively arranged between the outer wall of the throttle pipe and the inner wall of the perforating inner pipe, and between the outer wall of the perforating inner pipe and the inner wall of the perforating outer pipe; a coaxially arranged throttle lever is fixedly supported in the throttle pipe, and is provided with at least one projecting throttle joint; the periphery of the throttle lever is sleeved by a throttle sleeve which is axially limited in the throttle pipe; the external diameter of the throttle sleeve is the same with the internal diameter of the throttle pipe; the inner wall of the throttle sleeve corresponding to the throttle lever segment in front of the throttle joint is a flange; an airflow channel is formed between the inner wall of the throttle sleeve and the outer wall of the throttle lever. Through multistage decompression and speed reduction, the high pressure exhausting silencing apparatus can reduce and eliminate noise through high pressure exhausting.

Description

technical field [0001] The invention relates to the technical field of noise reduction and muffler devices, in particular to a high-pressure exhaust muffler device that implements noise reduction and muffler by performing multi-stage decompression and speed reduction on the basis of double-layer perforated pipes. Background technique [0002] The exhaust noise of high-pressure gas is generally produced by the unstable flow of high-speed airflow, that is, the strong turbulent noise generated when high-speed airflow is discharged from the exhaust pipe or nozzle. The turbulence noise is a typical quadrupole noise, and its radiation power is proportional to the pressure, the square of the nozzle diameter, and the eighth power of the velocity. Since the sound power of the quadrupole is closely related to the airflow velocity, reducing the flow velocity can greatly reduce the turbulence noise. [0003] At present, the main types of exhaust mufflers are throttling and decompressio...

AI Technical Summary

Problems solved by technology

The throttling control of the throttling decompression muffler mainly adopts the principle of sudden expansion throttling. This method is relatively simple, but because the gas flow velocity in a small cross-section and small chamber reaches the speed of sound and supersonic, the gas in high-speed movement It is easy to produce a high degree of inhomogeneity, which in turn will generate strong air noise, so it is difficult for this type of muffler to control the high vibration level and high noise; the small hole injection type muffler shifts the spectrum of the exhaust noise to the human ear through small holes In the inaudible high-frequency area, this kind of noise reduction method has a certain noise reduction effect, but it has a relatively large limit on the air intake pressure (generally no more than 10kg / cm2); the current exhaust muffler with composite structure is mainly multiple The combination of three parallel throttling muffler pipes, small hole injection structure, perforated pipe and filled with sound-absorbing materials, this kind of muffler has a significant noise reduction effect, but its structure is complex and bulky, subject to In the actual use process, there are many restrictions on the environment, and the stability is relatively low

Images