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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:

據了解，要想測得管道中氣體的真實壓力值，除了正確使用測壓儀器外，合理選擇測量斷面、減少氣流的擾動對測量結果的影響很大。

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.

測量斷面應盡量選擇在氣流平穩的直管段上。測定動壓時如發現明顯一個測點出現零值或負值，表明氣流不穩定，該斷面不宜作為測定斷面。

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.

當測量斷面設在彎頭、三通等異形部件前面(相對氣流流動方向)時，距這些部件的距離應大于2倍管道直徑。

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.

當測量斷面設在彎頭、三通等異形部件后面時，距這些部件的距離應大于4～5倍管道直徑。

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.

當測試現場難于滿足要求時，為減少誤差可適當增加測點。但是，測量斷面位置距異形部件的較小距離至少是管道直徑的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.

濟南通風管道

Jinan ventilation pipe

事實上，關于濟南通風管道的重要性在我們的生活中是眾所周知的，非常是當有人買房子時，都會考慮到通風效果，各種管道的位置將在建造的初始階段設計。三合一通風設備確保人們的生活質量。但是，你知道通風管道施工注意事項和噪音的原因嗎?

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，由于輸送氣體的溫度低于周圍空氣的露點，管道外壁可能會形成冷凝水。這將增加中.央空調系統風道的冷卻損失。水滴凝結會污染天花板、墻壁和地板。因此，還應進行冷絕緣處理。長期使用會導致生銹和老化。提醒管理人員定期布置管道，以延長使用壽命。有時會有一些特殊的通風管道：防腐涂料將用于防腐保護。使用油漆時，清潔管道并均勻涂抹以防腐蝕。

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，濟南通風管道產生噪音的原因是什么呢

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

1.吸油煙機設備不堅固

1. Range hood equipment is not solid

如果吸油煙機的位置不均勻，螺絲松動，零件脫落，導致操作與支架產生共振，產生噪音，此時有必要重新安裝吸油煙機或零件，并編制位置預算，以確保設備正確。

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.止回閥裝置錯誤

2. Check valve device error

例如，單向閥的失效和脫落可能導致排煙效果不佳。油煙可能在管道和止回閥中產生共振，或者氣流可能受到干擾，從而容易產生噪音。此時，應重新安裝止回閥或更換新的止回閥。

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.風輪葉片變形，裝置不正確

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

由于長期使用，風輪附有大量的油污，造成不平衡。也許有些葉片斷裂了，會引起噪音。此時，應定期清潔吸油煙機，必要時應更換風輪。

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.

吸油煙機和通風管已經很長時間沒有清洗了。

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

長期運行產生的油漬和異物在煙道和吸油煙機內，電風扇不穩定，噪音大。這樣，吸油煙機和通風管道應該定期清洗，空氣流動應該正常。廚房內空氣不流通，吸油煙機與通風管之間的對流不順暢，廚房內不會形成負壓，排氣不順暢，也會產生噪音。

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.