Need Roots blower to replace the centrifugal fan, what brand good quality and low price

Previously I have been in Japan to do environmental protection, each project are used to the fan, centrifugal fan, axial fan, rotary, Roots fan are often used, the Roots fan and centrifugal fan is quite familiar with the first few years back to set up a company of environmental protection, I said the use of the situation in the past few years, I don't know how many Roots fan manufacturers, but we have used the brand is really quite a lot of, more good, Hunan Changsha Changgu's, Jiangsu Pepsi's, Shandong's chapter drum, Jin Gong, etc., Taiwan's also a few good. Among them, the Pepsi fan and Jin Gong Roots fan is more worth buying, relatively speaking, cheaper, quality is also good!

Then say the difference between centrifugal fan and Roots fan

1, centrifugal blower principle of operation When the motor rotates to drive the fan impeller rotation, the impeller in the impeller between the blades of the gas is also followed by the rotation, and in the centrifugal force under the action of the flinging of these gases, the gas flow rate increases, so that the gas in the flow of the kinetic energy is converted into static pressure energy, and then with the fluid pressurization, so that the static pressure energy and conversion Then with the fluid pressurization, the static pressure energy is converted into velocity energy, and the gas is discharged through the exhaust port, and a certain negative pressure is formed in the middle of the impeller. Due to the negative pressure at the inlet, the outside gas is made up for immediately under the action of atmospheric pressure, and the gas is discharged and made up for under the action of continuous rotating of the impeller, so as to achieve the purpose of continuous air blowing. Under the same power, the wind pressure and wind volume are generally inversely proportional. Under the same power, the wind pressure is high, the wind volume will be relatively low, while the wind volume is large, the wind pressure will be lower, so as to make full use of the power efficiency of the motor.

2, Roots fan, Roots blower working principle Working principle: Roots fan is a volumetric fan, conveying the air volume proportional to the number of revolutions, three-bladed impeller each rotation by two impellers for three suction, exhaust, compared with the two-bladed type, the gas pulsation becomes less, the load change is small, high mechanical strength, low noise, vibration is also small. There are 2 three-lobe type impellers on the shaft of 2 flat phase rows, the wheel and oval chassis bore surface and the impeller always keep a small gap between the three, because the impeller is the opposite direction of each other and rotate at a constant speed, so that the box and the impeller surrounded by a certain amount of gas by the inhalation of one side of the conveyor to the side of the discharge. The impellers are always kept in the correct phase by the synchronous gears and do not touch each other, so they can be high-speed, do not need internal lubrication, and have a simple structure, smooth operation, stable performance, adapt to a variety of uses, and have been used in a wide range of fields.

Simply put: under the same power, the centrifugal fan has a large air volume and low pressure, and the Roots blower has a high pressure and small air volume.