1、 Main technical parameters of multi-stage blower
Flow range
The import flow rate is usually 15~500m ³/min, for example, the D300-31-1.5 model has a flow rate of 300m ³/min.
Some high-voltage models can reach speeds of over 250m ³/min.
Pressure range
The export pressure covers 10-100kPa (gauge pressure), and some models can increase the pressure by up to 0.2MPa (absolute pressure 1.5kg/cm ²).
The vacuum degree supports -800~-5000mmHg ₂ O.
Power and speed
The motor power ranges from 7.5kW to 200kW, with a 30kW model consuming approximately 30 kWh per hour.
The speed is usually between 2000-5000rpm, and high-speed models require dynamic balancing design.
Efficiency and Noise
The aerodynamic efficiency can reach over 78% (three element flow impeller design).
The operating noise is ≤ 85dB (A), and some models can reduce it to below 70dB through mufflers.
Material and sealing
The impeller material includes aluminum alloy and high-strength alloy steel, and the casing is made of cast iron or carbon steel.
Adopting a labyrinth seal to prevent gas leakage.
2、 National standards and energy efficiency requirements
Energy Efficiency Standards
GB 28381-2012 "Energy Efficiency Limit Values and Energy Efficiency Evaluation Values for Centrifugal Blowers" specifies the energy efficiency testing methods and limit values for single-stage/multi-stage centrifugal blowers.
The energy efficiency level must comply with indicators such as total pressure efficiency and unit power air volume.
Environmental requirements
HJ/T 251-2006 "Technical Requirements for Environmental Protection Products - Roots Blowers" is applicable to blowers that transport clean air, requiring low noise and low leakage.
Industry standards
Some enterprises (such as Shandong Linfeng) implement the technical specifications of the D series multi-stage centrifugal blower, including continuous operation>1 year, environmental adaptability (-35~40 ℃), etc.
3、 Typical Applications and Selection Suggestions
Application areas: wastewater treatment aeration, blast furnace blowing, chemical gas transportation, etc.
Selection points: It is necessary to match the flow rate and pressure margin (10% -20%), and corrosive gases should be made of stainless steel material.
