关于罗茨风机压力和风量的关系困扰了很多客户，今天我们就来简单介绍一下。 如果压力不够的话，需要更换更大功率的电机，如果压力过大，建议加变频器来调节。

　　首先，要明白几个概念，罗茨风机铭牌上的压力是额定压力，就是风机可提供大**压强，这个压力值的大小与配套的电机功率成正比;另一个，罗茨风机运行时机头上的压力表显示的压力是管道内的压力，这个压力表上的数值等于你管道的压力，与管道的负荷有关成正比。

　　其次，无变频器的普通罗茨鼓风机的压力无法随便调的，主要原因是罗茨鼓风机的电机功率是固定的，**的额定功率不变，罗茨鼓风机的压力就不会发生变化。如果压力不够的话，需要更换更大功率的电机，如果压力过大，建议加变频器来调节。

　　以下是一些压力基本关系，可了解。

　　1、压力与电机功率的关系

　　需要克服前方管道更大的压力，就需要更大功率的电机，电机功率越大，风机的功率就会越大。罗茨鼓风机的压力值是固定的，就是我们常说的选型压力，这个压力受到电机功率的影响。

　　风机功耗

　　风扇的理想功耗(无损耗)可以表示为

　　P： dp

　　(1)

　　哪里

　　P： =理想功耗(W

　　dp=风机中的tota/压力增加(Pa，N/m-)

　　=风机输送的风量(m/s)

　　不同风量和压力增加下的功耗如下所示：

　　风扇，功耗

　　总压力，总压力

　　Pi = dp q (1)

　　where

　　Pi = ideal power consumption (W)

　　dp = total pressure increase in the fan (Pa, N/m2)

　　q = air volume flow delivered by the fan (m3/s)

　　笔记对于详细的工程设计，请使用实际风机的制造商规范。

　　风机效率

　　风扇效率是传输到气流的功率与风扇使用的功率之间的比率。风扇效率通常与空气密度无关，可表示为：

　　=dp q/p

　　2、压力和风量的关系

　　罗茨风机的压力与风量无关，风机的选型压力**并不能增大风机的风量，罗茨风机的风量与转速息息相关，风机的转速越高风量越大。通常，我们所说的冷却风机的****风量和压力，即风机的进风口和出风口之间没有压差的状态下的风量(**风量)，而封闭房间的风机直到风量为零的状态下的气室和外界空气的压差(**静压)。它们不是两个孤立的性能指标，而是相互制约的，流体力学中的速度与压力之间的关系是——随着气流之间的压差减小，风、气压测量需要通过符合美国AMCA-210标准的风洞测试仪进行;在选择风扇时，还要考虑系统阻尼。

　　3、风机压力不够怎么办?

　　我们在使用罗茨风机的过程中，我们有的朋友可能会发现，压力表的表值达不到我们的要求，压力值偏低，我们该怎么**罗茨风机的压力呢?这种情况实际是罗茨风机的选型压力选大了，实际前方管道的压力并没有那么大，可加一个变频器来省电，如果不在乎电费不用管也可以。

　　以上关于罗茨鼓风机压力与风量的关系由上海瑞柘环保设备集团有限公司原创整理编辑!仅供瑞柘环保客户客户参考!

　　上海瑞柘环保设备集团有限公司生产销售罗茨鼓风机15年!

　　Many customers have been troubled by the relationship between the pressure and air volume of Roots blower. Today we will briefly introduce it. If the pressure is not enough, the motor with higher power needs to be replaced. If the pressure is too high, it is recommended to add a frequency converter for adjustment.

　　First of all, several concepts should be understood. The pressure on the nameplate of Roots blower is the rated pressure, that is, the blower can provide a large maximum pressure, and the value of this pressure is proportional to the power of the supporting motor; On the other hand, the pressure displayed by the pressure gauge on the head of Roots blower during operation is the pressure in the pipeline. The value on this pressure gauge is equal to the pressure of your pipeline, which is directly proportional to the load of the pipeline.

　　Secondly, the pressure of ordinary roots blower without frequency converter cannot be adjusted at will. The main reason is that the motor power of Roots blower is fixed, and the maximum rated power remains unchanged, so the pressure of Roots blower will not change. If the pressure is not enough, the motor with higher power needs to be replaced. If the pressure is too high, it is recommended to add a frequency converter for adjustment.

　　The following are some basic relationships of stress, which can be understood.

　　1. Relationship between pressure and motor power

　　To overcome the greater pressure of the pipeline in front, a higher power motor is required. The higher the motor power, the greater the fan power will be. The pressure value of Roots blower is fixed, that is, the model selection pressure, which is affected by the motor power.

　　Fan power consumption

　　The ideal power consumption (no loss) of the fan can be expressed as

　　P: DP

　　(1)

　　where

　　P: = ideal power consumption (W

　　Dp= tota/ pressure increase in the fan (PA, n/m-)

　　=Air volume delivered by fan (m/s)

　　The power consumption under different air volume and pressure increases is as follows:

　　Fan, power consumption

　　Total pressure

　　Pi = DP Q (1)

　　Where

　　Pi = ideal power consumption (W)

　　DP = total pressure increase in the fan (PA, n/m2)

　　Q = air volume flow delivered by the fan (m3/s)

　　Note for detailed engineering, please use the manufacturer's specifications of the actual fan.

　　Fan efficiency

　　Fan efficiency is the ratio of the power transmitted to the airflow to the power used by the fan. Fan efficiency is usually independent of air density and can be expressed as:

　　=DP q/p

　　2. Relationship between pressure and air volume

　　The pressure of Roots blower has nothing to do with the air volume. The pressure rise of blower selection does not increase the air volume of the blower. The air volume of Roots blower is closely related to the rotating speed. The higher the rotating speed of the blower, the greater the air volume. Generally, the optimal maximum air volume and pressure of the cooling fan, that is, the air volume (maximum air volume) under the condition that there is no pressure difference between the air inlet and outlet of the fan, while the pressure difference (maximum static pressure) between the air chamber and the outside air under the condition that the air volume of the fan in the closed room is zero. They are not two isolated performance indicators, but they restrict each other. The relationship between velocity and pressure in fluid mechanics is that as the pressure difference between air flows decreases, wind and pressure measurements need to be carried out by wind tunnel testers that meet the American amca-210 standard; System damping is also considered when selecting a fan.

　　3. What if the fan pressure is not enough?

　　In the process of using roots blower, some of our friends may find that the gauge value of the pressure gauge does not meet our requirements, and the pressure value is low. How can we increase the pressure of Roots blower? In fact, the pressure of Roots blower selection is too high. In fact, the pressure of the pipeline in front is not so high. You can add a frequency converter to save power. If you don't care about the electricity charge, you can leave it alone.

　　The above relationship between Roots blower pressure and air volume was originally edited by Shanghai Ruizhe Environmental Protection Equipment Group Co., Ltd! Only for the reference of Ruizhe environmental protection customers!

　　Shanghai Ruizhe Environmental Protection Equipment Group Co., Ltd. has been producing and selling roots blowers for 15 years!

　　The