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Low Pressure Permanent Magnet Variable Speed Drive Rotary Screw Air Compressor

Rated Power: 22~280 kW Discharge Pressure: 0.2~0.5 MPa Free Air Delivery: 5.5~72 m³/min

Product Introduction

Low Pressure Permanent Magnet Variable Speed Drive Rotary Screw Air Compressor

Product Features

New generation high-efficiency screw compressor airend

A new energy-saving helical gear profile technology; a novel 5:6 asymmetric rotor tooth profile; equipped with a Leitz high-precision three‑coordinate measuring machine, delivering superior machining accuracy, minimal vibration, and low noise. It utilizes original Swedish‑imported SKF tapered roller bearings; compared with conventional models, it achieves energy savings of 2%–5% or more over similar products on the market.

Enhance the specially customized oil–gas separation system.

Specially designed oversized oil‑separation cylinders and oil‑separation elements for 0.5 MPa and 0.2 MPa applications, effectively ensuring lower energy consumption; air filters, oil–gas separators, and oil‑separation elements utilize imported filter media from Germany; three‑stage fine separation—rotational neutralization, mechanical impact, and adsorption‑coalescence—guarantees an oil content in the compressed air of less than 2 ppm; the cylinder lid is galvanized for an attractive finish that resists rust; shock‑absorbing cushioning pads prevent pipe rupture caused by vibration.

High-performance vector inverter

Standard equipment includes a high-frequency reactor, effectively reducing both the high-frequency emissions from the inverter and external magnetic field interference; it reliably lowers peak inrush current during startup, enabling smooth acceleration; and helps cut costs on power‑supply equipment. A specialized heat‑dissipation design prevents thermal shutdowns in summer’s high temperatures. A dust‑proof mesh is standard, and the circuit board features a surface coating that provides resistance to dirt, dust, and moisture. It supports the CAN standard protocol, complies with hardware cabling specifications, and offers strong noise immunity. The system rapidly tracks pressure changes, keeping pressure fluctuations within ±0.01 MPa while delivering robust performance; it precisely supplies the required air volume. Integrated fan and motor with dual‑vector vector‑control inverter technology.

Efficient and powerful cooling system

Air-cooled units feature an optimized, oversized finned‑tube cooling system that delivers high heat‑dissipation efficiency, ensuring continuous operation even in high‑temperature, high‑humidity conditions and enhancing overall machine performance and stability. (Water‑cooled units available as an option.) The horizontal shell-and-tube condenser employs a copper‑core design that can be disassembled for convenient cleaning, with stainless‑steel or red‑copper inner tubes that offer excellent corrosion resistance and are suitable for harsh operating environments.

High-efficiency split-type permanent magnet motor

High-efficiency, fully enclosed, air-cooled permanent-magnet variable-frequency motor with an IP55 protection rating and Class F insulation, effectively preventing dust and moisture ingress. Equipped with SKF bearings to ensure exceptionally long service life, it can operate reliably even under harsh conditions. Standard phase‑sequence protection prevents reverse rotation, and the unit fully complies with national energy‑efficiency standards.

Energy-Saving Intake Control System

A newly designed, integrated intake valve featuring specialized engineering, with a wide adjustment range for air intake and pressure regulation. It delivers low pressure loss, stable operation, and extended service life. Key components of the intake valve, including the solenoid valve, are sourced from internationally renowned brands, ensuring safe and cost-effective operation of the screw compressor.

High-efficiency, energy-saving filtration system

High-efficiency oil–gas separator, featuring a compact, streamlined design, a coalescing separation element, and an oil‑return system; service life of 6,000 hours. Oil filter with low‑pressure drop design, offering a service life of up to 4,000 hours; its high filtration accuracy effectively protects bearings and the screw compressor rotor. Air filter that, during filtration, does not alter the airflow direction—air passes directly through the filter media, minimizing pressure loss and delivering greater energy efficiency than conventional air filters. It boasts a larger filtration area, higher precision, and an extended service life.

Technical Specifications

Model No.	Rated Power	Discharge Pressure	Free Air Delivery (FAD)	Noise Level	Outlet Pipe Size	Unit Weight	Overall Dimensions LWH
Model No.	(kW)	(MPa)	(m³/min)	dB(A)	(EN)	(kg)	(mm)
WZS-22A/W0.3V/GD	22	0.3	6.5	70±3	RC2	1200	196012701670
WZS-22A/W0.5V/GD	22	0.5	5.5	69±3	RC11/2	700	160010001370
WZS-30A/W0.3V/GD	30	0.3	9	70±3	DN65	2000	251516701960
WZS-30A/W0.5V/GD	30	0.5	7.2	69±3	RC2	1250	170012701500
WZS-37A/W0.2V/GD	37	0.2	14	71±3	DN125	2400	260015002100
WZS-37A/W0.5V/GD	37	0.5	8	70±3	RC2	1030	170012701500
WZS-45A/W0.2V/GD	45	0.2	16.8	71±3	DN125	2450	260015002100
WZS-45A/W0.3V/GD		0.3	13.7	71±3	DN125	2450	260015002100
WZS-45A/W0.5V/GD		0.5	11	70±3	DN50	2200	220013001750
WZS-55A/W0.2V/GD	55	0.2	21.5	72±3	DN150	4000	320018502150
WZS-55A/W0.3V/GD		0.3	16.5	72±3	DN125	2700	305018502120
WZS-55A/W0.5V/GD		0.5	13.5	71±3	DN100	2200	220013001750
WZS-75A/W0.2V/GD	75	0.2	27	73±3	DN200	4000	320018502150
WZS-75A/W0.3V/GD		0.3	21.5	73±3	DN15	4000	320018502150
WZS-75A/W0.5V/GD		0.5	16.5	72±3	DN65	2200	220013001750
WZS-90A/W0.2V/GD	90	0.2	31	73±3	DN200	4000	320018502150
WZS-90A/W0.3V/GD		0.3	28	73±3	DN150	4000	320018502150
WZS-90A/W0.5V/GD		0.5	20.5	72±3	DN100	4200	320020502120
WZS-110A/W0.2V/GD	110	0.2	40	74±3	DN250	5800	420021502300
WZS-110A/W0.3V/GD		0.3	34	74±3	DN150	5800	420021502300
WZS-110A/W0.5V/GD		0.5	23.5	73±3	DN125	4200	320020502120
WZS-132A/W0.2V/GD	132	0.2	47	74±3	DN300	6900	420021502300
WZS-132A/W0.3V/GD		0.3	45	74±3	DN250	5800	420021502300
WZS-132A/W0.5V/GD		0.5	30	73±3	DN125	4200	320020502120
WZS-160A/W0.2V/GD	160	0.2	55.7	75±3	DN300	7000	440021202300
WZS-160A/W0.3V/GD		0.3	47	75±3	DN250	6900	420021502300
WZS-160A/W0.5V/GD		0.5	33	74±3	DN200	4200	320020502120
WZS-200A/W0.3V/GD	200	0.3	55.8	76±3	DN250	7000	440021202300
WZS-200A/W0.5V/GD	200	0.5	45	75±3	DN200	7000	420021502250
WZS-250A/W0.3V/GD	250	0.3	65	77±3	DN250	9200	500021502300
WZS-250A/W0.5V/GD	250	0.5	55.5	76±3	DN200	8400	465021502300
WZS-280A/W0.3V/GD	280	0.3	72	78±3	DN300	10000	520022002350
WZS-280A/W0.5V/GD	280	0.5	60	77±3	DN250	9000	500021502250

Remarks:

1. In our model naming convention, WZS stands for oil-injected screw; A/W, air-cooled/water-cooled; V/G, PM VSD/fixed-speed; D, single-stage twin-screw.

2. Compressor volumetric flow is tested under loaded conditions complying with GB/T3853 (equivalent to ISO1217) and GB19153-2019.

3. Standard power supply: 380V, 3-phase, 50Hz. Earthing is mandatory. For custom power supply, water-cooled units, units with different discharge pressures and other special requirements, please contact your sales representative.

4. Final dimensions refer to the latest official drawings. We reserve the right to revise product specifications without prior notification.

Features:

Specifically designed for low-pressure, high-flow applications; eliminates the need for high-pressure relief, with energy consumption 30%–40% lower than conventional 8-bar models, delivering consistently stable, high‑volume airflow.

Applications:

Textile and synthetic fiber industries (the most common use case), environmental wastewater treatment and biofermentation, powder conveying in cement and building materials, the paper industry, glass and ceramic production, pneumatic conveying of food, grain, and oil products, chemical feedstock transport, auxiliary processes in lithium‑ion battery and photovoltaic manufacturing, non‑ferrous metal smelting, as well as large central air‑conditioning systems and ventilation support in cleanrooms.

Keywords:

Low Pressure Permanent Magnet Variable Speed Drive Rotary Screw A

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