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通風(fēng)管道工程設(shè)備在實際使用中可能會出現(xiàn)噪音過大的問題，那么這個問題我們怎么避免呢？這就要求我們在通風(fēng)設(shè)備的設(shè)計、制造、安裝時在以下方面做好對降噪處理：

How can we avoid the problem of excessive noise in ventilation duct engineering equipment during actual use? This requires us to do a good job in noise reduction in the design, manufacturing, and installation of ventilation equipment in the following aspects:

降低通風(fēng)設(shè)備聲源噪聲：

Reduce noise from ventilation equipment sources:

（1）合理選擇通風(fēng)管道工程設(shè)備的機(jī)型。在噪聲控制要求高的場合，應(yīng)選用低噪聲通風(fēng)設(shè)備。不同型號的通風(fēng)設(shè)備在同意的風(fēng)量、風(fēng)壓下、機(jī)翼型葉片的離心通風(fēng)設(shè)備噪聲小，前向版型葉片的離心通風(fēng)設(shè)備噪聲大。

(1) Reasonably select the type of ventilation duct engineering equipment. In situations where high noise control requirements are needed, low-noise ventilation equipment should be selected. Different models of ventilation equipment have lower noise levels for centrifugal ventilation equipment with wing shaped blades and higher noise levels for centrifugal ventilation equipment with forward facing blades under agreed air volume and pressure.

（2）通風(fēng)管道工程設(shè)備的工作點應(yīng)接近效率點。同一型號的通風(fēng)設(shè)備效率越高，噪聲越小。為使通風(fēng)設(shè)備的運行工況點保持在通風(fēng)設(shè)備的效率區(qū)，應(yīng)盡量避免用閥門進(jìn)行工況調(diào)節(jié)。如須在通風(fēng)設(shè)備壓出端設(shè)閥門時，其設(shè)置的位置是距通風(fēng)設(shè)備出口1m處。它能使2000Hz以下的噪聲降低。在通風(fēng)設(shè)備入口處氣流應(yīng)保持均勻。

(2) The working point of ventilation duct engineering equipment should be close to the efficiency point. The higher the efficiency of ventilation equipment of the same model, the lower the noise. To keep the operating point of ventilation equipment within the efficiency zone of the ventilation equipment, it is advisable to avoid using valves for condition adjustment as much as possible. If a valve needs to be installed at the outlet of the ventilation equipment, its position should be 1m away from the outlet of the ventilation equipment. It can reduce noise below 2000Hz. The airflow at the entrance of the ventilation equipment should be kept uniform.

（3）在可能條件下適當(dāng)降低通風(fēng)設(shè)備的轉(zhuǎn)速。通風(fēng)設(shè)備的旋轉(zhuǎn)噪聲與葉輪圓周速度10次方成比例，渦流噪聲與葉輪圓周速度6次方（或5次方）成比例。故降低轉(zhuǎn)速可降低噪聲。

(3) Reduce the speed of ventilation equipment appropriately under possible conditions. The rotational noise of ventilation equipment is proportional to the 10th power of the impeller circumferential velocity, and the eddy current noise is proportional to the 6th power (or 5th power) of the impeller circumferential velocity. Reducing the speed can lower the noise.

（4）通風(fēng)設(shè)備進(jìn)、出口的噪聲級是通風(fēng)理、風(fēng)壓曾加而增加。因此，設(shè)計通風(fēng)系統(tǒng)時，應(yīng)盡量減少系統(tǒng)的壓力損失。當(dāng)通風(fēng)系統(tǒng)的總量和壓力損失較大時，可將其分為小系統(tǒng)。

(4) The noise level at the inlet and outlet of ventilation equipment increases due to the increase in ventilation and air pressure. Therefore, when designing a ventilation system, efforts should be made to minimize the pressure loss of the system. When the total amount and pressure loss of the ventilation system are large, it can be divided into small systems.

（5）氣流在管道內(nèi)的流速不宜過高，以免引起再生噪聲。確定管道內(nèi)氣流流速應(yīng)根據(jù)不同要求按有關(guān)規(guī)定選取。

(5) The flow velocity of the airflow in the pipeline should not be too high to avoid causing regenerative noise. The airflow velocity inside the pipeline should be selected according to different requirements and relevant regulations.

（6）注意通風(fēng)設(shè)備與電動機(jī)的傳動方式。采用直聯(lián)傳動的通風(fēng)設(shè)備噪聲小，用聯(lián)軸器的次之，用沒有接縫的三角皮帶傳動的稍差。通風(fēng)設(shè)備應(yīng)配用低噪聲的電動機(jī)。

(6) Pay attention to the transmission mode of ventilation equipment and electric motors. Ventilation equipment using direct transmission has low noise, followed by those using couplings, and slightly worse when using seamless V-belts for transmission. Ventilation equipment should be equipped with low-noise electric motors.

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