Screw compressor APM series

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AirHorse SLPM Series Two-Stage Single-Drive PM VSD Screw Air Compressor

Short Description:
AirHorse SLPM series two-stage single-drive PM VSD screw air compressor is a high-efficiency, energy-saving rotary screw compressor designed for industrial compressed air systems. It combines two-stage compression, permanent magnet synchronous motor (PMSM), variable frequency drive (VFD), PID vector control and intelligent HMI monitoring. It delivers 15–20% more air flow, up to 15% energy saving compared with single-stage compression, and average 30% higher energy efficiency. Available from 22 kW to 355 kW, with 0.7, 0.8 and 1.0 MPa pressure options.

Product Overview:
AirHorse SLPM series two-stage single-drive PM VSD screw air compressor adopts advanced two-stage compression technology with equal pressure ratio interstage pressure setting. After the air is first compressed, enhanced oil injection cooling reduces the second-stage suction temperature. The air is then isothermally compressed to reduce compression work.

Because the two-stage design uses a much lower compression ratio per stage than single-stage compression, backflow leakage between rotors is greatly reduced. Volumetric efficiency and adiabatic efficiency are significantly improved, increasing compressed air output.

The air end uses a newly designed patented rotor profile, precision machined through more than 20 processes to ensure precision, reliability and effectiveness. The exhaust end features a unique combination of two pairs of cylindrical bearings, providing excellent reliability under extreme conditions and a designed service life of more than 100,000 hours, up to ≥150,000 hours.

The system combines a high-efficiency permanent magnet synchronous motor, variable frequency control, PID vector control and multi-data algorithm to ensure smooth operation, low noise, low vibration and long service life. Compared with same-power single-stage air compressors, energy efficiency is improved by an average of 30%, meeting the national first-class energy efficiency standard.

Key Benefits:
Two-stage compression – lower compression ratio, less leakage, higher volumetric efficiency

15–20% more air flow under the same power compared with single-stage compression

Up to 15% energy saving compared with single-stage compression

Average 30% higher energy efficiency compared with same-power single-stage air compressors

Meets national first-class energy efficiency standard

Permanent magnet synchronous motor – high performance, IP55, F-class insulation, B-class temperature rise

Variable frequency regulation – stable supply pressure, ±0.01 MPa constant-pressure control

Intelligent remote monitoring – 24-hour online monitoring, automatic early warning

HMI touch screen – simple operation, fault display, energy-saving mode, remote operation

Interstage oil spray cooling – high cooling efficiency, uniform lubrication, lower power consumption, no intermediate cooler

Long bearing life – designed service life over 100,000 hours, up to ≥150,000 hours

Low noise, low vibration, durable operation

Working Principle: Two-Stage Compression for Higher Efficiency
After the air is first compressed, the second suction temperature is reduced by strengthening fuel injection cooling. The air is isothermally compressed to reduce compression work.

The two-stage compression uses an equal pressure ratio to set the interstage pressure. Therefore, the compression ratio of each stage is much lower than the single-stage compression ratio. Backflow leakage between the rotors is greatly reduced, and volumetric efficiency and adiabatic efficiency are greatly improved, increasing compressed air production.

Under the same power, the air production of two-stage compression is up to 15% higher than single-stage compression, and up to 15% energy saving can be achieved.

Compared with a single-stage screw air compressor with a rated output pressure of 8 bar, the compression ratio of the two-stage screw air compressor is lower than 40% of the former. Lower compression ratio brings the following advantages:

Lower backflow leakage and higher output flow of the screw air end

Lower compression heat and lower temperature rise in the compression chamber, improving volumetric efficiency

Lower axial and radial force on the rotor, greatly reducing bearing load and improving rotor and bearing service life and reliability

Main Features:
Air End Bearing
The exhaust end uses a unique combination of two pairs of cylindrical bearings. Extra-large bearings provide excellent reliability under extreme conditions. Designed service life is more than 100,000 hours. Under two-stage design, bearing service life can reach ≥150,000 hours.

Variable Frequency Regulation and Stable Supply Pressure
The traditional control method adjusts the inlet valve opening to regulate intake air volume, and a large amount of energy is consumed in the valve throttling process. With VFD speed control, flow adjustment is achieved by changing the host speed, greatly reducing energy consumption.

High-accuracy constant-pressure control with a pressure variation range of ±0.01 MPa provides the necessary air volume at the necessary pressure. Set pressure accuracy is 0.01 MPa, achieving maximum energy saving.

Intelligent Monitoring
Smart housekeeper remote monitoring provides 24-hour online monitoring. No special management is needed. Open the mobile phone to quickly obtain machine operation information. When the machine encounters a malfunction or needs maintenance, the system automatically sends an early warning message.

More Convenient Operation
The intelligent HMI human-machine interaction interface makes operation simple and convenient, with clear status at a glance. Energy-saving mode and remote operation can be switched directly on the display. In case of failure, the fault content is displayed on the screen for quick troubleshooting.

AirHorse unique closed-loop vector control and PID control achieve fast response, safety and reliability. The constant-pressure control system accurate to 0.01 MPa provides high response, superior load tracking and safety.

Pressure control mode can be set and changed by touching the screen. Timer operation and alternate operation functions save energy and labor. Compressor running status and various settings can be confirmed on the display.

Interstage Oil Spray Cooling Design
Interstage lubricating oil three-dimensional spray is close to atomization. Cooling efficiency is high, lubrication is uniform, and power consumption is greatly reduced. The intermediate cooler is eliminated, reducing pressure loss and maintenance costs.

Two-Stage Compression Air End Increases Exhaust Volume by 20%
The air end adopts a newly designed patented rotor profile, precision processed through more than 20 procedures to ensure precision, reliability and effectiveness.

The two-stage compression air end greatly reduces the single-stage compression ratio. Through reasonable distribution, internal leakage is reduced, volumetric efficiency is improved, and bearing load is reduced. Bearing service life can be increased to ≥150,000 hours, greatly improving air end service life.

Compared with single-stage compression, exhaust volume is increased by 15%–20% under the same power.

Permanent Magnet Synchronous Motor Performance Improved by 10%
The motor is made of high-performance NdFeB magnetic material, and motor performance is improved by 5%–10%. It has excellent magnetic properties, allowing the motor to maintain high performance in different frequency bands, making it more suitable for air compressor frequency conversion.

IP55 protection grade effectively prevents dust and moisture from entering the motor. F-class insulation, B-class temperature rise.

Standard bearing ceramic material coating technology prevents electrostatic shock to the spindle and ensures long-term continuous trouble-free operation. Multi-data inverter control increases unit effectiveness by 20%.

The system adopts PID vector control technology. The embedded computer reads more operating data. Through a unique advanced algorithm, the unit can be adjusted to the appropriate torque and speed while ensuring the lowest temperature rise, driving the air end more efficiently and smoothly, meeting a wider range of exhaust volume requirements, and increasing unit effectiveness by 20%.

Performance
The two-stage compression air end is equipped with permanent magnet motor drive and multi-data frequency conversion algorithm control. Through independent R&D system combination, the unit runs smoothly, with reduced noise and vibration, and is durable.

Compared with same-power single-stage air compressors, energy efficiency is improved by an average of 30%, reaching the national first-class energy efficiency standard.

Technical Specifications

Model: SLPM-30A | Pressure: 0.7 / 0.8 / 1.0 MPa | Air Flow: 4.5 / 4.3 / 3.8 m³/min | Motor Power: 22 kW | Outlet Size: 1" | Dimensions: 1400×900×1225 mm | Weight: 680 kg

Model: SLPM-50A | Pressure: 0.7 / 0.8 / 1.0 MPa | Air Flow: 7.6 / 7.2 / 6.5 m³/min | Motor Power: 37 kW | Outlet Size: 1½" | Dimensions: 1560×1000×1365 mm | Weight: 780 kg

Model: SLPM-75A | Pressure: 0.7 / 0.8 / 1.0 MPa | Air Flow: 12.5 / 11.9 / 10.3 m³/min | Motor Power: 55 kW | Outlet Size: 2" | Dimensions: 2100×1430×1740 mm | Weight: 2180 kg

Model: SLPM-100A | Pressure: 0.7 / 0.8 / 1.0 MPa | Air Flow: 16.2 / 15.7 / 15.2 m³/min | Motor Power: 75 kW | Outlet Size: 2" | Dimensions: 2100×1430×1740 mm | Weight: 2280 kg

Model: SLPM-120A | Pressure: 0.7 / 0.8 / 1.0 MPa | Air Flow: 19.7 / 19.1 / 16.0 m³/min | Motor Power: 90 kW | Outlet Size: 2½" | Dimensions: 2500×1480×1770 mm | Weight: 3200 kg

Model: SLPM-150A | Pressure: 0.7 / 0.8 / 1.0 MPa | Air Flow: 24.5 / 23.5 / 19.5 m³/min | Motor Power: 110 kW | Outlet Size: 2½" | Dimensions: 2500×1480×1770 mm | Weight: 3360 kg

Model: SLPM-175A | Pressure: 0.7 / 0.8 / 1.0 MPa | Air Flow: 28.2 / 27.0 / 24.4 m³/min | Motor Power: 132 kW | Outlet Size: 2½" | Dimensions: 2700×1580×1770 mm | Weight: 3650 kg

Model: SLPM-220A | Pressure: 0.7 / 0.8 / 1.0 MPa | Air Flow: 34.6 / 32.5 / 30.9 m³/min | Motor Power: 160 kW | Outlet Size: DN80 | Dimensions: 2800×1910×2320 mm | Weight: 4150 kg

Model: SLPM-250A | Pressure: 0.7 / 0.8 / 1.0 MPa | Air Flow: 39.5 / 37.5 / 34.9 m³/min | Motor Power: 185 kW | Outlet Size: DN80 | Dimensions: 3250×2210×2320 mm | Weight: 4700 kg

Model: SLPM-280A | Pressure: 0.7 / 0.8 / 1.0 MPa | Air Flow: 43.1 / 40.7 / 38.3 m³/min | Motor Power: 200 kW | Outlet Size: DN80 | Dimensions: 3250×2210×2320 mm | Weight: 5000 kg

Model: SLPM-300A | Pressure: 0.7 / 0.8 / 1.0 MPa | Air Flow: 47.5 / 45.6 / 40.7 m³/min | Motor Power: 220 kW | Outlet Size: DN80 | Dimensions: 3250×2210×2320 mm | Weight: 5250 kg

Model: SLPM-350A | Pressure: 0.7 / 0.8 / 1.0 MPa | Air Flow: 53.8 / 51.0 / 45.0 m³/min | Motor Power: 250 kW | Outlet Size: DN125 | Dimensions: 4330×2130×2370 mm | Weight: 6300 kg

Model: SLPM-380A | Pressure: 0.7 / 0.8 / 1.0 MPa | Air Flow: 59.2 / 55.7 / 48.5 m³/min | Motor Power: 280 kW | Outlet Size: DN125 | Dimensions: 4330×2130×2370 mm | Weight: 6500 kg

Model: SLPM-420W | Pressure: 0.7 / 0.8 / 1.0 MPa | Air Flow: 63.5 / 60.7 / 55.8 m³/min | Motor Power: 315 kW | Outlet Size: DN150 | Dimensions: 4200×2350×2400 mm | Weight: 7800 kg

Model: SLPM-480W | Pressure: 0.7 / 0.8 / 1.0 MPa | Air Flow: 77.9 / 74.5 / 65.7 m³/min | Motor Power: 355 kW | Outlet Size: DN150 | Dimensions: 4700×2350×2400 mm | Weight: 8500 kg

Applications
AirHorse SLPM series two-stage single-drive PM VSD screw air compressor is suitable for industrial compressed air systems requiring stable pressure, high efficiency and energy saving, such as:

General manufacturing

Textile industry

Food and beverage

Pharmaceutical industry

Electronics and semiconductors

Automotive and parts

Packaging

Printing

Chemical industry

Pneumatic tools and automation

Other industrial compressed air applications

After-Sales Service
AirHorse Compressor has a complete dealer service system in China and 5 after-sales service offices directly under the headquarters. We have about 130 dealers in more than 40 countries overseas. We can effectively serve customers and process various orders in China and abroad, providing timely and effective after-sales service.

We also provide energy-saving solutions such as energy recovery, frequency conversion retrofit and energy-saving optimization systems, which can greatly reduce your production costs.