Water pipe flow stabilizing broadband muffler

Abstract

The invention discloses a water pipe flow stabilizing broadband muffler which comprises a water delivery pipe and a muffler casing. An expanded perforated pipe is fixedly installed on the inner side of one end of a muffler casing body fixedly connected with the water delivery pipe. An end plate is fixedly arranged at the other end of the muffler casing. A shunting perforated pipe is further fixedly connected onto the end plate, and a throttle ring is fixedly arranged at the port position of the inner end of the shunting perforated pipe. The inner diameter of the expanded perforated pipe is larger than the outer diameter of the shunting perforated pipe, the inner end of the expanded perforated pipe and the inner end of the shunting perforated pipe are in fixedly sleeved connection in a gapped mode, and the flowing cross area of the water delivery pipe is smaller than the sum of the hole flowing cross area of the end plate and the flowing cross area of the shunting perforated pipe. The water pipe flow stabilizing broadband muffler can achieve broadband muffling of the water pipe, effectively stabilize a flow field at the outlet end of the water pipe, reduce the water spraying-flowing speed and pressure, accordingly reduce water pipe port noise effectively and achieve the effects of flow stabilizing and broadband muffling.

Description

technical field [0001] The invention relates to a noise reduction technical equipment, in particular to a silencer for hydrodynamic noise of a water pipeline system. Background technique [0002] In the water pipeline system, pumps, valves, elbows and channel cross-section mutations will generate hydrodynamic noise, and the noise transmitted through the pipeline will hardly attenuate with the increase of the propagation distance, and finally radiate directly from the pipeline port. Form a serious radiation noise source. In addition, when the water in the water pipeline flows out from the nozzle, the water will flow out in the form of a jet due to a sudden change in the flow field at the outlet end, and the pulsation of the water jet velocity and jet pressure will also cause the pipeline to vibrate and generate jet noise . Especially for ships, submarines and other ships with narrow interior space or other tactical and technical requirements, the noise of the pipeline and t...

AI Technical Summary

Problems solved by technology

Therefore, for ships, the noise of water pipelines not only affects the concealment of ships and the safety and reliability of equipment operation, but also has a great impact on the marine acoustic environment.

[0003] Although there are significant differences in the pressure pulsation in water pipes and air pipes: firstly, air noise and water noise have different media, and the characteristic impedance of air media and water have a difference of more than 3000 times; secondly, it is often used for sound absorption in air media 1. The sound insulation material is basically sound-permeable in the liquid medium, and the air has good compressibility. Most of the mufflers in the air work at lower pressures, while the water pipeline mufflers have to withstand a wide range of working pressures. Therefore, the water muffler There is a big difference in the muffler mechanism from the air muffler

Although the development of the air muffler is relatively mature, there are relatively few studies on the water pipeline muffler. Due to the difference in the properties of the two fluid media, water and air, the design of the water pipeline muffler cannot completely learn from or copy the design method of the air muffler. , so it is very necessary and urgent to study the muffler of the water pipeline

[0004] Chinese patent application 201310009357.1 discloses a pressure self-balancing hydrodynamic noise device connected in series in the water pipeline. It is equipped with a barrel shell on the outside of the perforated pipe section, and can be filled between the perforated pipe section and the barrel shell. Compress the elastic element to form an accumulator noise reduction structure. Although the noise muffler can suppress the pressure pulsation in the pipeline and reduce the noise of the pipeline, its noise reduction frequency band is narrow and it is difficult to suppress broadband hydrodynamic noise. It is even more incapable of stabilizing the jet flow field at the outlet end of the pipeline and reducing the jet noise at the port, but precisely this kind of port has high radiation efficiency of vibration and noise, and has the most direct impact on the environment and the concealment of ships

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