The measurement of wind speed and air volume in Jinan ventilation duct is obtained by measuring pressure conversion. The following is a brief introduction by Xiao Bian:
It is understood that in order to measure the real pressure value of the gas in the pipeline, in addition to the correct use of pressure measuring instruments, reasonable selection of measuring section and reduction of air flow disturbance have a great impact on the measurement results.
The measuring section should be selected on the straight pipe section with smooth air flow as far as possible. When measuring the dynamic pressure, if zero or negative value is found at any measuring point, it indicates that the air flow is unstable, and this section should not be used as the measuring section.
When the measuring section is set in front of the elbow, tee and other special-shaped parts (relative to the flow direction), the distance from these parts should be greater than 2 times of the pipe diameter.
When the measuring section is set behind the elbow, tee and other special-shaped parts, the distance from these parts should be greater than 4-5 times of the pipe diameter.
When the test site is difficult to meet the requirements, in order to reduce the error, we can increase the measuring points appropriately. However, the small distance between the measuring section and the abnormal parts is at least 1.5 times of the pipe diameter.
Jinan ventilation pipe
In fact, the importance of Jinan ventilation pipe is well known in our life, especially when someone buys a house, they will consider the ventilation effect, and the location of various pipes will be designed in the initial stage of construction. Three in one ventilation equipment ensures people's quality of life. However, do you know the precautions of ventilation duct construction and the causes of noise?
In summer, because the temperature of the gas transported is lower than the dew point of the surrounding air, condensation water may form on the outer wall of the pipeline. This will increase the cooling loss of central air conditioning system. Condensation of water droplets can contaminate the ceiling, walls and floors. Therefore, cold insulation treatment should also be carried out. Long term use will cause rust and aging. Remind managers to arrange pipelines regularly to prolong service life. Sometimes there are some special ventilation pipes: anticorrosive coating will be used for anticorrosive protection. When using paint, clean the pipe and apply evenly to prevent corrosion.
So, what is the reason for the noise of Jinan ventilation duct
1. Range hood equipment is not solid
If the position of the range hood is uneven, the screws are loose, and the parts fall off, which leads to the resonance between the operation and the bracket and produces noise, it is necessary to re install the range hood or parts, and prepare the position budget to ensure the correct equipment.
2. Check valve device error
For example, the failure and falling off of one-way valve may lead to poor smoke exhaust effect. Oil fumes may cause resonance in pipes and check valves, or the air flow may be disturbed, which may easily cause noise. At this time, the check valve should be re installed or replaced with a new one.
3. The wind turbine blade is deformed and the device is incorrect
Due to the long-term use, the wind turbine is attached with a large amount of oil, resulting in imbalance. Maybe some blades are broken, which will cause noise. At this time, the range hood should be cleaned regularly, and the wind wheel should be replaced if necessary.
The range hood and ventilation pipe have not been cleaned for a long time.
Long term operation of oil and foreign bodies in the flue and range hood, fan instability, noise. In this way, the range hood and ventilation pipe should be cleaned regularly, and the air flow should be normal. The air in the kitchen is not circulating, the convection between the range hood and the ventilation pipe is not smooth, the negative pressure will not be formed in the kitchen, the exhaust is not smooth, and the noise will also be produced.