As long as fans are involved, pressure parameters will be involved. Roots fans are different from other types of fans. The pressure parameter of Roots fans is to overcome the resistance of the pipeline, which is often referred to as the back pressure in the industry. This pressure parameter is the main parameter in the selection, and it is possible to provide accurate pressure parameters when selecting models.
The flow is the air volume, usually in cubic meters per minute or cubic meters per hour. The flow parameter of Roots blower refers to the volume of gas transported per unit time under standard conditions. The calculation formula is as follows:
Q (inlet)=Q (outlet) × density of outlet gas (kg/m3)/density of inlet gas (kg/m3)
Convert the flow Q (standard, m3/h, normal temperature and pressure) in the standard state into the intake flow Q (inlet, m3/min), which can be calculated according to the following formula:
Q (inlet)=Q (standard) × P (inlet gas pressure, Pa)/(P (inlet gas pressure, Pa) - S (relative humidity) × P (water vapor saturation pressure, Pa)) × T (thermodynamic temperature of inlet gas, K)/273
The speed of Roots blower will not interfere with the wind pressure of the blower, that is, the wind can maintain the pressure of the equipment no matter how the speed changes. The fan speed is proportional to the air volume, that is, the larger the air volume, the higher the fan speed.
The pressure characteristics of Roots blower mainly include the following aspects: within a certain pressure range, system changes will affect the pressure.
① The pressure of the equipment is adaptive and changes with the system resistance.
② When the pressure changes, the flow changes very little, because Roots blower has the exhaust characteristics of forced ventilation.
According to the above characteristics, we can change the fan pressure in the following ways.
① Pressure is required to replace the system. In short: change the size of the air outlet. Larger money and smaller boost.
② Adjust the working clearance of the equipment.
③ Install a pressure relief valve on the equipment.
Roots blower is a rotary compressor, which uses two blade rotors to move relative in the cylinder to compress and transmit gas. Before the Roots blower is officially put into operation, a period of trial operation is required to ensure that
Normal operation. Here is a brief introduction for everyone:
1. Open the inlet and exhaust valves, turn on the power supply at the beginning of the load, and verify the rotation direction. The cooling water fan must be connected to the cooling water before starting.
2. Run 20-30 minutes after no-load startup to check abnormal vibration and heat. If any abnormality occurs, please stop immediately and find out the reason. The abnormal phenomenon is mainly caused by poor installation or misalignment of the coupling, as well as other conditions, such as improper lubricating oil level.
3. Operate under normal load for 2-3 hours, and observe the temperature and vibration of each component at the same time.
4. Please pay attention to the value displayed by the ammeter during operation. In case of any abnormality, please stop the machine immediately for inspection. Most of the reasons are caused by system overpressure.
I believe that after reading the above content, you should also understand the changes in pressure and flow of Roots blower. I hope it will be helpful to you.
Text label: Roots blower
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