The requirements for Roots blowers used in pneumatic conveying mainly involve performance parameters, operating environment, structural characteristics, and maintenance. The following is a detailed analysis of these requirements:
1、 Performance parameter requirements
1. Airflow: The airflow of the Roots blower needs to meet the requirements of the pneumatic conveying system, usually expressed in cubic meters per minute (m3/min) or cubic feet per minute (CFM). When selecting, the flow rate of the blower should be determined based on the design requirements and capabilities of the system, ensuring that it matches the capabilities of other equipment in the system.
2. Wind pressure: Wind pressure refers to the gas pressure generated by a fan, usually expressed in pascals (Pa) or millimeters of water column (mmH2O). The magnitude of wind pressure directly affects the distance and height of gas transportation, so the required wind pressure should be determined based on the required distance and height of gas transportation.
3. Speed: The selection of speed should be determined based on the operating environment and requirements of the fan. Excessive rotational speed may lead to increased wear of the fan, while excessively low rotational speed may affect the performance of the fan. Therefore, it is necessary to choose an appropriate rotational speed to meet the requirements of pneumatic conveying.
2、 Environmental requirements for use
1. Transport medium: Roots blower is usually used to transport clean air at room temperature. If other gases need to be transported, a special model of Roots blower is required. For flammable, explosive, toxic and other hazardous gases, special treatment or avoidance of use of the fan is required. In addition, the content and size of solid particles in the conveying medium also need to meet the requirements of the Roots blower to avoid scratching the rotor and casing.
2. Environmental temperature: The ambient temperature during the operation of the Roots blower should be maintained within a range, usually between -15 ℃ and 40 ℃. Low or high temperatures can cause damage to the fan. Therefore, it is necessary to increase the inspection frequency of fans in winter and summer, and take necessary insulation or cooling measures.
3、 Structural characteristics requirements
1. Shell type: The shell of Roots blower is usually horizontally divided for easy installation and maintenance. The material of the casing should have sufficient strength and sealing performance to ensure the stable operation of the fan.
2. Impeller type: The impeller of Roots blower usually adopts three blade or two blade type to achieve uniform compression and transportation of gas. The material of the impeller should have wear resistance and corrosion resistance to extend the service life of the fan.
3. Bearing type: The bearings of Roots blowers usually use rolling bearings or sliding bearings to ensure the smooth operation of the blower. The lubrication method of bearings should also be determined according to the usage environment and requirements.
4、 Maintenance requirements
1. Regular inspection: The Roots blower should be inspected regularly, including parameters such as power supply, voltage, current value, pressure, atmospheric temperature, discharge temperature, bearing temperature, vibration, noise, oil level, etc. Problems should be promptly addressed to avoid the escalation of the malfunction.
2. Lubrication and maintenance: The bearings and gears of the Roots blower should be regularly lubricated and maintained to reduce wear and noise. The selection of lubricating oil should be determined based on the usage environment and requirements.
3. Cleaning and maintenance: The inlet filter of the Roots blower should be regularly cleaned and maintained to keep the environment clean and avoid clogging. At the same time, the casing and impeller of the fan should also be cleaned and maintained to extend the service life of the fan.
In summary, the performance parameters, operating environment, structural characteristics, and maintenance requirements that need to be met for Roots blowers used in pneumatic conveying. When selecting and using, these factors should be fully considered to ensure the stable operation and delivery of the fan.
