A brief analysis of the noise of the voltage regulator

There are two main types of noise produced by high-pressure gas flowing through voltage regulators, one is gas dynamic noise, and the other is mechanical noise from mechanical parts.

The mechanical noise of the voltage regulator mainly comes from the valve core, valve stem, and other movable parts of the pressure regulator. Due to the impact force of the fluid, the parts with clearance fit vibrate, rub, and collide with each other, causing the rigid metal to emit noise. This continuous frequency range is very wide, and the amplitude of the noise wave depends on the collision of the vibrating body. energy, mass, stiffness, and damping, but the general vibration frequency is less than 1500Hz, which is low-frequency noise.

voltage regulator

The dynamic noise of the pressure regulator comes from the high-pressure and high-speed gas being throttled through the regulating valve. The flow rate reaches the speed of sound or even supersonic speed and is in a critical state. The state parameters of the throttled gas change, that is, an irreversible adiabatic entropy increase, and a volume expansion process occurs. However, in the downstream pipeline of the pressure regulator, when the gas flow rate drops to subsonic speed, the pressure suddenly rises, triggering a shock wave in the opposite direction to the airflow. The shock wave generates a pressure wave again and propagates close to the speed of sound. In addition, the turbulent disturbance of gas in the voltage regulator will also produce non-periodic noise of 1000-4000Hz.

pressure regulator

In actual use, it needs to be based on the working condition range, that is, the specifications and model of the pressure regulator, the nominal diameter of the inlet and outlet, the nominal diameter of the connected downstream pipeline, the inlet pressure range, the outlet pressure, the theoretical flow rate at the inlet treatment, and the theoretical flow rate at the outlet. , downstream pipeline speed limit, and other data are comprehensively calculated to calculate the sound pressure level of the pressure regulator without a muffler and decide whether to take silencing measures. The basic method for testing the sound pressure level of voltage regulator products is: with the voltage regulator as the center, on the horizontal planes on both sides in the direction of the voltage regulator pipeline (0.8-1.2m above the ground), arrange 3 units 1m away from the voltage regulator. measuring points, 1 meter apart from each other. A total of six measuring points are contained in a closed space with only one noise source: the voltage regulator. Use a sound pressure meter to measure the sound pressure levels at 6 points, and take the maximum sound pressure level. Generally, The measured sound pressure level error is required to be no more than 5dB. The flow rate test also stipulates that the diameter of the pipeline should not be less than the diameter of the connecting pipe of the pressure regulator. Under the fully open valve operating condition, the flow rate of the outlet connecting the pipe of the pressure regulator should not exceed the following values:

When P≥0.05MPa, the maximum flow velocity V=50m/s

When P≤0.05MPa, the maximum flow velocity V=25m/s

In the actual working environment, noise includes environmental noise and noise generated by the product itself. To consider the impact of noise, it is necessary to decide whether to take noise reduction measures based on the actual situation on site.

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