The selection of Roots blower is a comprehensive consideration process involving multiple factors. The following are some key selection steps and precautions:
1、 Clarify system requirements
1. Flow rate: Determine the required air volume for the system, usually measured in cubic meters per hour (m3/h). In order to meet the needs of development, surplus capacity is usually reserved when designing process systems. Therefore, when choosing a blower, the flow rate should have a margin of 1.1-1.25 times the required flow rate of the system.
2. Pressure: Determine the required boost for the system, usually measured in pascals (Pa) or millibars (mbar). Considering the complexity of pressure drop calculation in process design, for the sake of conservatism, a margin of 1.05-1.15 times the system pressure drop should be left when determining the pressure rise of the blower.
3. Medium: Consider the type, temperature, properties, etc. of the medium processed by the system to ensure that the Roots blower is suitable for the required process. Different media have different material and sealing requirements, which need to be selected according to specific situations.
4. Temperature: Consider the inlet and outlet temperatures of the blower to ensure its normal operation under working conditions.
5. Altitude: The operating altitude of the blower also needs to be considered, as altitude has an impact on the performance of the blower.
2、 Select fan model
1. Structural type: Select the appropriate Roots blower structural type according to system requirements, such as single-stage, two-stage, etc.
2. Performance specifications: Select the model that meets the requirements from a variety of available models based on flow and pressure requirements.
3. Reliability: Consider the corrosion resistance, wear resistance, and sealing performance of the product to ensure the long-term stable operation of the fan.
3、 Consider economy
1. Price: Choose from a variety of available models based on requirements such as energy efficiency, high quality, and low cost, or focus on one of these requirements.
2. Operating costs: Choose products with good quality and high efficiency, which have lower operating costs, higher output efficiency, and longer service life.
4、 Other precautions
1. Motor type: Choose the appropriate motor type based on the usage environment and requirements, such as general purpose three-phase asynchronous motors, corrosion-resistant motors, explosion-proof motors, etc.
2. Sealing type: For different media, especially flammable, explosive, toxic, corrosive gases and rare and valuable gases, the sealing type must be selected reasonably according to the principles of effective sealing and economic practicality.
3. Noise and vibration: Consider the noise and vibration situation of the fan, especially in situations where there are restrictions on environmental noise.
4. Installation space: Consider the installation space and layout of the fan, and choose the appropriate installation method and size.
5、 Example of selection process
1. List conditions and requirements: including usage, gas properties, operating parameters, environmental conditions, public conditions, etc.
2. Selection calculation: Based on the usage requirements, select the material and sealing type of the fan, and preliminarily select the product model and specifications. Then calculate the performance parameters of the selected product under specified operating conditions, including flow rate, shaft power, and exhaust temperature. After selecting the fan model and specifications, determine the prime mover (motor) and transmission method, and choose the matching accessories.
3. List the selection list: including fan model, performance parameters, motor parameters, transmission mode, supporting accessories, etc.
