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Single-stage Fixed-speed Rotary Screw Air Compressor

Rated Rated Power: 7.5~300 kW Discharge Pressure: 0.7~1.25 MPa Free Air Delivery: 0.8~50 m³/min

Product Introduction

Single-stage Fixed-speed 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 to conventional models, it achieves energy savings of 2%–5% or more over similar products on the market.

Multi-level electrical safety protection

Reliable Siemens core electrical control components ensure the unit’s long-term stable operation. The design is meticulously engineered, with clear and well‑organized process steps, and incorporates comprehensive safety protection measures covering pressure, temperature, current, mechanical transmission, and more. Compliant with CE and UL standards, it safeguards both the equipment and personnel.

SKF bearing

Compared with bearings from other brands, SKF bearings offer excellent wear resistance, superior fatigue strength, robust corrosion resistance, and quiet, smooth operation, resulting in longer service life, higher reliability, and reduced noise for permanent‑magnet synchronous sensorless motors.

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.) These units are equipped with horizontal shell-and-tube condensers; the copper core can be removed independently for easy cleaning, while the inner tubes—made of stainless steel or red copper—are highly corrosion‑resistant, making them suitable for harsh operating environments.

Air-cooled IP23 high-efficiency split-type permanent-magnet motor

High-efficiency, semi‑closed, air‑cooled permanent‑magnet variable‑frequency motor with an IP23 protection rating. The high‑efficiency permanent‑magnet motor and the screw rotor are integrated via an internal, one‑piece shaft‑direct‑drive configuration, achieving a transmission efficiency approaching 100%. With no gearbox, no belts, and no losses in transmission efficiency, the unit boasts a compact footprint—typically about one‑third that of a conventional motor.

IP55 High-Efficiency Asynchronous Motor

High-efficiency, fully enclosed 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 all units meet national energy‑efficiency standards.

High-efficiency, energy-saving filtration system

High-efficiency oil–gas separator, featuring a compact 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 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-7.5A/W0.7GD	7.5	0.7	1.2	66±2	G3/4	240	10006001000
WZS-7.5A/W0.8GD		0.8	1.1
WZS-7.5A/W1.0GD		1.0	0.95
WZS-7.5A/W1.25GD		1.25	0.8
WZS-11A/W0.7GD	11	0.7	1.7	70±2	G3/4	400	10406001180
WZS-11A/W0.8GD		0.8	1.6
WZS-11A/W1.0GD		1.0	1.4
WZS-11A/W1.25GD		1.25	1.2
WZS-15A/W0.7GD	15	0.7	2.4	70±2	G3/4	410	10406001180
WZS-15A/W0.8GD		0.8	2.2
WZS-15A/W1.0GD		1.0	2.0
WZS-15A/W1.25GD		1.25	1.7
WZS-22A/W0.7GD	22	0.7	3.8	70±2	G11/4	620	13806501150
WZS-22A/W0.8GD		0.8	3.5
WZS-22A/W1.0GD		1.0	3.2
WZS-22A/W1.25GD		1.25	2.9
WZS-30A/W0.7GD	30	0.7	5.2	70±2	G11/4	680	13806501150
WZS-30A/W0.8GD		0.8	3.0
WZS-30A/W1.0GD		1.0	4.3
WZS-30A/W1.25GD		1.25	3.7
WZS-37A/W0.7GD	37	0.7	6.4	74±2	G11/2	840	160010001370
WZS-37A/W0.8GD		0.8	6.1
WZS-37A/W1.0GD		1.0	5.7
WZS-37A/W1.25GD		1.25	5.1
WZS-45A/W0.7GD	45	0.7	8.0	74±2	G11/4	890	145012001420
WZS-45A/W0.8GD		0.8	7.7
WZS-45A/W1.0GD		1.0	7.0
WZS-45A/W1.25GD		1.25	5.8
WZS-55A/W0.7GD	55	0.7	10.5	74±2	G2	1735	205012001520
WZS-55A/W0.8GD		0.8	9.8
WZS-55A/W1.0GD		1.0	8.7
WZS-55A/W1.25GD		1.25	7.5
WZS-75A/W0.7GD	75	0.7	13.6	75±2	G2	1850	205012001500
WZS-75A/W0.8GD		0.8	13.3
WZS-75A/W1.0GD		1.0	11.6
WZS-75A/W1.25GD		1.25	9.8
WZS-90A/W0.7GD	90	0.7	16.3	75±2	G2	1920	215013001700
WZS-90A/W0.8GD		0.8	15.0
WZS-90A/W1.0GD		1.0	14.6
WZS-90A/W1.25GD		1.25	12.3
WZS-110A/W0.7GD	110	0.7	20.3	75±2	DN65	3030	280016501850
WZS-110A/W0.8GD		0.8	19.0
WZS-110A/W1.0GD		1.0	17.0
WZS-110A/W1.25GD		1.25	14.6
WZS-132A/W0.7GD	132	0.7	24.0	75±2	DN65	3130	280016501850
WZS-132A/W0.8GD		0.8	23.0
WZS-132A/W1.0GD		1.0	20.0
WZS-132A/W1.25GD		1.25	18.0
WZS-160A/W0.7GD	160	0.7	27.0	75±2	DN80	3210	280016501850
WZS-160A/W0.8GD		0.8	26.5
WZS-160A/W1.0GD		1.0	22.5
WZS-160A/W1.25GD		1.25	20.1
WZS-185A/W0.7GD	185	0.7	32.5	78±2	DN80	3470	280016501850
WZS-185A/W0.8GD		0.8	31.0
WZS-185A/W1.0GD		1.0	28.0
WZS-185A/W1.25GD		1.25	25.1
WZS-220A/W0.7GD	220	0.7	40.0	78±2	DN100	4500	290018602000
WZS-220A/W0.8GD		0.8	36.8
WZS-220A/W1.0GD		1.0	32.2
WZS-220A/W1.25GD		1.25	28.5
WZS-250A/W0.7GD	250	0.7	43.5	78±2	DN100	4600	290018602000
WZS-250A/W0.8GD		0.8	42.0
WZS-250A/W1.0GD		1.0	38.8
WZS-250A/W1.25GD		1.25	34.6
WZS-300A/W0.7GD	300	0.7	50.8	80±2	DN125	7000	420022002150
WZS-300A/W0.8GD		0.8	48.2
WZS-300A/W1.0GD		1.0	42.6
WZS-300A/W1.25GD		1.25	39.8

Remarks:

1. In our model naming convention, WZS stands for oil-injected screw; A/W, air-cooled/water-cooled; G, 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. Custom power supply, water-cooled units, units with alternative discharge pressures and other special requirements are available; please contact your sales representative.

4. Final dimensions refer to the latest official drawings. The manufacturer reserves the right to revise product specifications without prior notification.

Applications:

Woodworking and furniture manufacturing, automotive repair and maintenance shops, electronics and home appliance assembly, packaging and printing in light‑industry facilities, aluminum doors, windows, and hardware production, textile and garment factories, general food and grain processing, small injection‑molding and rubber‑processing plants, advertising and signage fabrication, general mechanical machining, warehousing and logistics, small‑scale environmental water treatment, building materials and stone processing, and other industries.

Keywords:

Single-stage Fixed-speed Rotary Screw Air Compressor

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