8 solutions for QYB explosion-proof methanol pump control valve noise 1) Elimination of resonance noise method Only when the valve is resonating, there is energy superposition and more than 100 decibels of strong noise. Some performances are strong vibration, low noise, some vibrations are weak, and the noise is very large; some vibrations and noise are large. 8 solutions for QYB explosion-proof methanol pump control valve noise
1) Elimination of resonance noise method Only when the regulation valve resonates, there is energy superposition and a strong noise of more than 100 decibels is generated. Some performances are strong vibration, low noise, some vibrations are weak, and the noise is very large; some vibrations and noise are large. This noise produces a single-tone sound with a frequency of typically 3,000 to 7,000 Hz. Obviously, the resonance is eliminated and the noise naturally disappears. For methods and examples, see 4), 5), and 6) in 4.5 above.
2) Elimination of cavitation noise method Cavitation is the main source of hydrodynamic noise. At the time of cavitation, the bubble burst produces a high-speed impact, causing strong turbulence locally, resulting in cavitation noise. This noise has a wide frequency range that produces a gig sound similar to that of a fluid containing sand. Eliminating and reducing cavitation is an effective way to eliminate and reduce noise.
3) The use of thick-walled pipeline method QYB explosion-proof methanol pump using thick-walled pipe is one of the sound path treatment methods. The use of thin walls increases noise by 5 decibels, and the use of thick-walled tubes reduces noise by 0 to 20 decibels. The thicker the same pipe diameter wall, the larger the pipe diameter of the same wall thickness, the better the noise reduction effect. For example, when the wall thickness of the DN200 pipeline is 6.25, 6.75, 8, 10, 12.5, 15, 18, 20, 21.5mm, the noise can be reduced to -3.5, -2 (ie increase), 0, 3, 6, respectively. 8, 11, 13, 14.5 decibels. Of course, the thicker the wall, the higher the cost.
4) Using the sound absorbing material method This is also a more common and effective method of sound path processing. The QYB explosion-proof methanol pump can use a sound absorbing material to wrap the noise source and the post-valve pipeline. It must be pointed out that because the noise will travel long distances through the fluid flow, where the sound absorbing material is wrapped, where the potted pipe is used, the effectiveness of the noise elimination is terminated. This method is suitable for situations where the noise is not very high and the pipeline is not very long, because it is a more expensive method.
5) Series Silencer Method This method is applicable to the muffling as aerodynamic noise, which can effectively eliminate the noise inside the fluid and suppress the noise level transmitted to the solid boundary layer. QYB explosion-proof methanol pump is the most effective and economical method for high mass flow rate or high pressure drop ratio before and after valve. Noise can be drastically reduced with an absorbing series silencer. However, from an economic point of view, it is generally limited to attenuation to about 25 decibels.
6) The soundproof box method uses soundproof boxes, houses and buildings to isolate the noise source inside, so that the noise of the external environment is reduced to a acceptable range.
7) Series throttling method QYB explosion-proof methanol pump adopts series throttling method when the pressure ratio of the regulating valve is high (△P/P1≥0.8), which is the fixed section where the total pressure drop is dispersed behind the regulating valve and the valve. On the flow component. If a diffuser or a porous restrictor is used, this is the most effective way to reduce noise. In order to get the best diffuser efficiency, the diffuser (solid shape, size) must be designed according to the installation of each piece, so that the noise level generated by the valve is the same as the noise level generated by the diffuser.
8) Select low-noise valve and low-noise valve to gradually reduce the supersonic speed at any point in the flow path according to the gradual deceleration of the fluid through the tortuous flow path (porous channel, multi-channel) of the valve core and the valve seat. A variety of low-noise valves of various configurations (designed for specialized systems) are available for use. When the noise is not very large, use a low-noise sleeve valve to reduce noise by 10 to 20 decibels, which is the most economical low-noise valve.
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