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A screw blower is a positive displacement compressor that utilizes two intermeshing, helically-shaped rotors to compress air. It represents a significant advancement in efficiency and reliability over traditional lobe-type rotary blowers, especially in applications requiring higher pressures or continuous operation.
Technical parameters
| Model | Power （kW） | Pressure（bar/kPa） | Volume flow（m³/min） | Pipe Diameter | Weight（kg） | Dimension (mm) |
| RK75BPM | 55kW | 0.4/40 | 55.0 | DN200 | 1800 | 2700×1400×1900 |
| 0.6/60 | 48.0 | |||||
| 0.7/70 | 44.0 | |||||
| 0.8/80 | 41.5 | |||||
| 1.0/100 | 35.0 | 1750 | ||||
| 1.2/120 | 31.0 | |||||
| 1.5/150 | 21.0 | DN150 | 1350 | 2200×1250×1900 | ||
| 1.8/180 | 16.5 | |||||
| 2.0/200 | 14.5 | |||||
| RK100BPM | 75kW 225S/M | 0.4/40 | 78.0 | DN250 | 2200 | 3100×1500×2150 |
| 0.6/60 | 68.0 | |||||
| 0.7/70 | 61.0 | |||||
| 0.8/80 | 55.0 | DN200 | 1800 | 2700×1400×1900 | ||
| 0.9/90 | 51.0 | |||||
| 1.0/100 | 47.0 | |||||
| 1.2/120 | 42.5 | |||||
| 1.5/150 | 34.0 | 1750 | ||||
| 1.8/180 | 27.0 | |||||
| 2.0/200 | 24.5 | DN150 | 1400 | 2200×1250×1900 |
Advantages
Superior Energy Efficiency: The internal compression mechanism and the widespread use of VFDs make screw blowers 20-30% more efficient than traditional lobe blowers, leading to substantial operational cost savings.
Low Noise & Vibration: The continuous compression process generates significantly less noise and vibration compared to the pulsating flow of lobe blowers, improving the working environment.
High Reliability & Low Maintenance: With no wear-prone components like timing gears (in oil-injected models) and lower operating speeds, screw blowers require less maintenance and have a longer lifespan.
Excellent Part-Load Performance: When paired with a VFD, screw blowers maintain high efficiency even at partial loads, unlike fixed-speed blowers which are inefficient when not at full capacity.
Stable Pressure Output: Delivers a consistent and pulsation-free air flow, which is beneficial for sensitive processes.
Compact Footprint: Provides a high flow and pressure output in a relatively small physical package, saving valuable floor space.
Industrial Applications
Wastewater Treatment: For aeration tanks to promote bacterial growth that breaks down organic matter.
Aquaculture: Providing oxygenation in fish and shrimp farms to maintain healthy dissolved oxygen levels.
Food & Beverage: Used in pneumatic conveying (transporting powders, grains), fermentation, and packaging. Oil-free models are essential here.
Pharmaceutical & Chemical: For processes requiring contamination-free air (oil-free), such as fermentation, fluid bed dryers, and reactor agitation.
Cement & Plastics: Pneumatic conveying of raw materials like cement, sand, and plastic pellets.
Power Generation: In Flue Gas Desulfurization (FGD) aeration and other process air applications.
Textile: Air jet looms and other manufacturing processes.
FAQ
Q1: What is the main difference between a screw blower and a traditional lobe (roots) blower?
A: The key difference is the compression method. Lobe blowers trap air and expel it without internal compression, leading to pulsations and lower efficiency. Screw blowers compress air internally between the meshing rotors, resulting in smoother flow, less noise, and significantly higher energy efficiency.
Q2: When should I choose an oil-free screw blower over an oil-injected one?
A: Choose an oil-free screw blower when the compressed air must be completely free of oil contamination. This is critical in industries like food, beverage, pharmaceuticals, and electronics. Choose an oil-injected model for general industrial applications where ultimate efficiency and a lower initial cost are priorities, and where trace oil in the air stream is not an issue.
Q3: Are screw blowers more expensive than lobe blowers?
A: The initial capital cost of a screw blower is typically higher. However, the Total Cost of Ownership (TCO) is often lower due to massive energy savings over the equipment's lifetime, especially in continuous operation applications.
Q4: How critical is a Variable Frequency Drive (VFD) for a screw blower?
A: A VFD is highly recommended. It allows the blower to match its output precisely to the demand, eliminating energy waste at part-load conditions. It also enables soft starts, reducing mechanical stress and electrical inrush currents.
Q5: What are the common maintenance requirements?
A:
Oil-Injected Models: Regular oil changes, oil filter, and air/oil separator element replacements.
Oil-Free Models: Primarily inlet air filter and coolant changes.
Both: Periodic checking of rotor clearances and control system calibration as per the manufacturer's schedule.
Q6: What is the typical lifespan of a screw blower?
A: With proper maintenance and operation, a screw blower can reliably operate for 60,000 to 80,000 hours before a potential major overhaul or rotor replacement may be needed.
A screw blower is a positive displacement compressor that utilizes two intermeshing, helically-shaped rotors to compress air. It represents a significant advancement in efficiency and reliability over traditional lobe-type rotary blowers, especially in applications requiring higher pressures or continuous operation.
Technical parameters
| Model | Power （kW） | Pressure（bar/kPa） | Volume flow（m³/min） | Pipe Diameter | Weight（kg） | Dimension (mm) |
| RK75BPM | 55kW | 0.4/40 | 55.0 | DN200 | 1800 | 2700×1400×1900 |
| 0.6/60 | 48.0 | |||||
| 0.7/70 | 44.0 | |||||
| 0.8/80 | 41.5 | |||||
| 1.0/100 | 35.0 | 1750 | ||||
| 1.2/120 | 31.0 | |||||
| 1.5/150 | 21.0 | DN150 | 1350 | 2200×1250×1900 | ||
| 1.8/180 | 16.5 | |||||
| 2.0/200 | 14.5 | |||||
| RK100BPM | 75kW 225S/M | 0.4/40 | 78.0 | DN250 | 2200 | 3100×1500×2150 |
| 0.6/60 | 68.0 | |||||
| 0.7/70 | 61.0 | |||||
| 0.8/80 | 55.0 | DN200 | 1800 | 2700×1400×1900 | ||
| 0.9/90 | 51.0 | |||||
| 1.0/100 | 47.0 | |||||
| 1.2/120 | 42.5 | |||||
| 1.5/150 | 34.0 | 1750 | ||||
| 1.8/180 | 27.0 | |||||
| 2.0/200 | 24.5 | DN150 | 1400 | 2200×1250×1900 |
Advantages
Superior Energy Efficiency: The internal compression mechanism and the widespread use of VFDs make screw blowers 20-30% more efficient than traditional lobe blowers, leading to substantial operational cost savings.
Low Noise & Vibration: The continuous compression process generates significantly less noise and vibration compared to the pulsating flow of lobe blowers, improving the working environment.
High Reliability & Low Maintenance: With no wear-prone components like timing gears (in oil-injected models) and lower operating speeds, screw blowers require less maintenance and have a longer lifespan.
Excellent Part-Load Performance: When paired with a VFD, screw blowers maintain high efficiency even at partial loads, unlike fixed-speed blowers which are inefficient when not at full capacity.
Stable Pressure Output: Delivers a consistent and pulsation-free air flow, which is beneficial for sensitive processes.
Compact Footprint: Provides a high flow and pressure output in a relatively small physical package, saving valuable floor space.
Industrial Applications
Wastewater Treatment: For aeration tanks to promote bacterial growth that breaks down organic matter.
Aquaculture: Providing oxygenation in fish and shrimp farms to maintain healthy dissolved oxygen levels.
Food & Beverage: Used in pneumatic conveying (transporting powders, grains), fermentation, and packaging. Oil-free models are essential here.
Pharmaceutical & Chemical: For processes requiring contamination-free air (oil-free), such as fermentation, fluid bed dryers, and reactor agitation.
Cement & Plastics: Pneumatic conveying of raw materials like cement, sand, and plastic pellets.
Power Generation: In Flue Gas Desulfurization (FGD) aeration and other process air applications.
Textile: Air jet looms and other manufacturing processes.
FAQ
Q1: What is the main difference between a screw blower and a traditional lobe (roots) blower?
A: The key difference is the compression method. Lobe blowers trap air and expel it without internal compression, leading to pulsations and lower efficiency. Screw blowers compress air internally between the meshing rotors, resulting in smoother flow, less noise, and significantly higher energy efficiency.
Q2: When should I choose an oil-free screw blower over an oil-injected one?
A: Choose an oil-free screw blower when the compressed air must be completely free of oil contamination. This is critical in industries like food, beverage, pharmaceuticals, and electronics. Choose an oil-injected model for general industrial applications where ultimate efficiency and a lower initial cost are priorities, and where trace oil in the air stream is not an issue.
Q3: Are screw blowers more expensive than lobe blowers?
A: The initial capital cost of a screw blower is typically higher. However, the Total Cost of Ownership (TCO) is often lower due to massive energy savings over the equipment's lifetime, especially in continuous operation applications.
Q4: How critical is a Variable Frequency Drive (VFD) for a screw blower?
A: A VFD is highly recommended. It allows the blower to match its output precisely to the demand, eliminating energy waste at part-load conditions. It also enables soft starts, reducing mechanical stress and electrical inrush currents.
Q5: What are the common maintenance requirements?
A:
Oil-Injected Models: Regular oil changes, oil filter, and air/oil separator element replacements.
Oil-Free Models: Primarily inlet air filter and coolant changes.
Both: Periodic checking of rotor clearances and control system calibration as per the manufacturer's schedule.
Q6: What is the typical lifespan of a screw blower?
A: With proper maintenance and operation, a screw blower can reliably operate for 60,000 to 80,000 hours before a potential major overhaul or rotor replacement may be needed.
