? Product Introduction
For the direct coupled drive Roots blower, the speed of the main shaft is determined by the speed of the motor. If the speed of the motor is fixed, the speed of the main shaft is fixed. For motors of the same level, the speed is fixed and cannot be adjusted at will. Relatively speaking, the maintenance of direct drive fans requires professional technicians to operate.
In some industries, due to the different working environments of machinery and equipment, some roller fans need to operate in high temperature environments, such as the steel industry. In this industry, the direct drive roller fans are generally selected. The belt driven fans are prone to slip due to the poor high temperature resistance of the belt, so the belt driven fans are less used in such working environments with high temperatures, The direct drive Roots blower is widely used.
Common characteristics of direct drive Roots blower and ordinary three leaf Roots blower:
1. The direct connected Roots blower is composed of four parts: casing, wallboard, impeller, inlet and outlet muffler, etc.
2. Casing: mainly used to support wallboard, impeller, muffler and fixation.
3. Wall plate: mainly used to connect the casing and the impeller, support the rotation of the impeller, and play the role of end face sealing
4. Impeller: It is the rotating part of Roots blower, which is divided into two leaves and three leaves. Now, because the three leaves have many advantages such as less air pulsation, less noise and smooth operation than the two leaves, it has gradually replaced the two leaves Roots blower.
5. Muffler: used to reduce the noise caused by air pulsation in and out of roots blower.
? Model parameters
model
(Directly connected to Roots blower) | Air volume range
（m?/min） | Motor 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 |
| Sr-225 | 32.95-70.56 | 18.5-110 | DN225 | 1080-1845 |
| Sr-250s | 35.83-76.72 | 18.5-132 | DN250 | 1115-1936 |
| Sr-250/300 | 61.4-114.8 | 30-160 | DN250/300 | 1843-2761 |
| Sr-300L/300L1 | 104.1-183.6 | 37-200 | DN300 | 2031-3440 |
| Sr-350/350L | 105.5-226 | 37-280 | DN350 | 3870-5700
|
? Factory photo
? Accessories include
Universal base, belt cover, Roots blower pulley, motor pulley, V-belt, safety valve, pressure gauge, air inlet silencer, air outlet silencer, anchor bolt, check valve, elastic joint, gear oil.
? application area
It is widely used in sewage treatment, aquaculture, pneumatic conveying, vacuum packaging, coal washing, combustion support, pressurization, casting, mining, metallurgy, chemical industry, light industry, building materials, power, flour, sand blasting, vacuum, etc.
? Performance characteristics
Advantages and disadvantages of direct drive and belt drive Roots blower:
1. Direct drive
Advantages: the fan speed can be selected in a wide range, and the flow is closer to the application needs.
Disadvantages: The belt drive requires tension, which adds additional lateral force to the fan shaft end.
2. Direct drive
Advantages: there is no lateral force on the fan shaft, and the transmission power can be very large.
Disadvantages: It is directly connected with the motor, and the optional speed is small. In most cases, the displacement of the fan is too large, so it needs to install a bypass pipeline to vent, which wastes a lot of power. Roots blower can be divided into belt drive Roots blower and direct drive Roots blower according to the drive mode. The direct drive Roots blower has no belt and is relatively expensive, mostly for Roots blower with fixed speed.
The belt drive is characterized by the flexible change of the flow of the roots blower, that is, the air volume, by changing the diameter of the pulley so as to change the speed of the roots blower. However, there are also drawbacks. No matter how good the quality of the belt is, it has a life span. The belt should be replaced in time after a long time, and the belt should be adjusted at intervals during use, The belt will slip or the air volume of the fan will be insufficient after it is loose. summary Belt driven Roots blower is easy to maintain and suitable for common site conditions; The direct drive Roots blower is suitable for high temperature environment and environment with high working condition requirements. The maintenance process is complex. In the actual selection of Roots blower, provide your on-site work requirements, Roots blower manufacturer Technicians will recommend the most suitable Roots blower to you as required.
