? Model parameters ： The two-stage series roots blower is a customized roots blower with higher pressure than the ordinary three blade roots blower and is easy to use. Please refer to the following parameters. The specific parameter selection needs to be determined by technicians according to the actual situation. Table of Selection Parameters of Two stage Series Roots Fans model
Two-stage series Roots blower) | Air volume range
（m?/min） | Power range
(kw) | Outlet diameter | Fan weight
（KG） | Pressure range | Voltage |
| Sr50 | 0.65-2.13 | 0.75-4 | DN50 | 87-119 | 9.8kp-58.8kp | 380V |
| Sr65 | 0.94-3.00 | 0.75-5.5 | DN65 | 98-145 |
| Sr80 | 2.34-5.22 | 2.2-7.5 | DN80 | 156-200 |
| Sr100 | 3.25-8.05 | 2.2-15 | DN100 | 190-297 |
| Sr125 | 5.35-11.7 | 3-18.5 | DN125 | 285-401 |
| Sr150 | 10.37-27.15 | 7.5-45 | DN150 | 471-706 |
| Sr175 | 19.65-38.67 | 11-75 | DN175 | 601-1090 |
| Sr200 | 27.65-57.14 | 15-90 | DN200 | 975-1490 |
? Principle introduction ： The two-stage series roots blower is a device composed of two roots blowers in series. Inside each Roots blower box, there are two three blade rotors with opposite turning directions. Each three blade rotor is supported by two bearings. A pair of high-precision synchronous spur gears are used to keep the relative positions of the two rotors constant. A certain clearance is maintained between rotors and between rotors and boxes, without contact rotation. Driven by the synchronous gear of the side box, the rotor separates the air inlet from the air outlet with the help of the "meshing" of the two rotors, completing the transfer process of the closed gas between the box and the rotor from the suction side to the discharge side. During rotation, the gas in the working chamber is pushed from the air inlet to the air outlet without internal compression. There are tiny gaps between rotors, between rotors and boxes, between rotors and wallboards, so there is no friction or contact wear in the working chamber. ? Performance characteristics: 1. The two-stage series Roots blower has high volumetric efficiency, large air supply, stable operation, reliable use and relatively stable working characteristics.
2. The impeller and shaft are of integral structure, and the impeller is free of wear. The performance of Roots blower is permanent and can operate continuously for a long time.
3. For forced gas transmission, the flow changes little with the pressure, the outlet pressure is determined by the back pressure, and the transmission gas is not polluted by oil.
4. The selection of bearings is reasonable, the service life of each bearing is even, and the oil seal of Roots blower is made of imported fluororubber material, which is high temperature resistant and wear-resistant, so the service life of Roots blower is long and the reliability is high.
5. Roots blower has large volume utilization rate, high volume efficiency, simple and compact structure, and flexible installation mode. Easy to use and maintain.
6. The Roots blower has low vibration and noise due to the adoption of a three blade rotor structure and a reasonable structure at the inlet and outlet of the housing. Pressure and temperature control to provide unit operation protection.
7. Roots blower oil seal is made of imported fluororubber, which is high temperature resistant, wear-resistant and has a long service life.
8. Complete models can meet the needs of different users for different purposes. ? Scope of application: Scope of application:
It is widely used in the pneumatic conveying system of ceramics, building materials, paper making, electricity, petroleum, chemical industry, textile, aquaculture, sewage treatment, food and other industries.
? Factory photo: The following figure is the actual picture of two-stage series Roots blower factory
Because there are different types of customization, there are other styles（ Double stage series Roots blower can be viewed by clicking ）
