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:

据了解，要想测得管道中气体的真实压力值，除了正确使用测压仪器外，合理选择测量断面、减少气流的扰动对测量结果的影响很大。

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.

测量断面应尽量选择在气流平稳的直管段上。测定动压时如发现任何一个测点出现零值或负值，表明气流不稳定，该断面不宜作为测定断面。

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.

当测量断面设在弯头、三通等异形部件前面(相对气流流动方向)时，距这些部件的距离应大于2倍管道直径。

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.

当测量断面设在弯头、三通等异形部件后面时，距这些部件的距离应大于4～5倍管道直径。

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.

当测试现场难于满足要求时，为减少误差可适当增加测点。但是，测量断面位置距异形部件的较小距离至少是管道直径的1.5倍。

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.

济南通风管道

Jinan ventilation pipe

事实上，关于济南通风管道的重要性在我们的生活中是众所周知的，特别是当有人买房子时，都会考虑到通风效果，各种管道的位置将在建造的初始阶段设计。三合一通风设备确保人们的生活质量。但是，你知道通风管道施工注意事项和噪音的原因吗?

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?

在夏季，由于输送气体的温度低于周围空气的露点，管道外壁可能会形成冷凝水。这将增加中.央空调系统风道的冷却损失。水滴凝结会污染天花板、墙壁和地板。因此，还应进行冷绝缘处理。长期使用会导致生锈和老化。提醒管理人员定期布置管道，以延长使用寿命。有时会有一些特殊的通风管道：防腐涂料将用于防腐保护。使用油漆时，清洁管道并均匀涂抹以防腐蚀。

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.

那么，济南通风管道产生噪音的原因是什么呢

So, what is the reason for the noise of Jinan ventilation duct

1.吸油烟机设备不坚固

1. Range hood equipment is not solid

如果吸油烟机的位置不均匀，螺丝松动，零件脱落，导致操作与支架产生共振，产生噪音，此时有必要重新安装吸油烟机或零件，并编制位置预算，以确保设备正确。

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.止回阀装置错误

2. Check valve device error

例如，单向阀的失效和脱落可能导致排烟效果不佳。油烟可能在管道和止回阀中产生共振，或者气流可能受到干扰，从而容易产生噪音。此时，应重新安装止回阀或更换新的止回阀。

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.风轮叶片变形，装置不正确

3. The wind turbine blade is deformed and the device is incorrect

由于长期使用，风轮附有大量的油污，造成不平衡。也许有些叶片断裂了，会引起噪音。此时，应定期清洁吸油烟机，必要时应更换风轮。

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.

吸油烟机和通风管已经很长时间没有清洗了。

The range hood and ventilation pipe have not been cleaned for a long time.

长期运行产生的油渍和异物在烟道和吸油烟机内，电风扇不稳定，噪音大。这样，吸油烟机和通风管道应该定期清洗，空气流动应该正常。厨房内空气不流通，吸油烟机与通风管之间的对流不顺畅，厨房内不会形成负压，排气不顺畅，也会产生噪音。

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.