Discover the ultimate solution for your industrial needs with our Oil-Lubricated Screw Compressor from Sanzhi (Henan) Compressor Co., Ltd. As a leading China supplier, we offer factory pricing on our Permanent Magnet Variable Frequency Two-Stage Screw Air Compressor. Equipped with high-quality centrifugal fans, this stationary system ensures exceptional energy savings and high efficiency. Experience superior performance and cost-effectiveness with our state-of-the-art compressor technology.
Internal Structure Frontside
Internal Structure Backside
Working Principle
In an ideal air compression process, the power required for single-stage pressure transmission equals the sum of the power required for multi-stage compression. However, in reality, the actual working power increases due to various factors such as transmission power loss from the coupling, bearing friction, and the cooling effect of liquid viscosity. Consequently, by reducing the compression ratio for each stage, we can minimize useless power, making the total power required for multi-stage compression less than that for single-stage compression.
The two-stage screw air compressor consists of a two-stage rotary screw compressor system. Each stage includes an active and a passive screw. The active screw drives the passive screw through an external power transmission device. The first stage utilizes a low-pressure rate screw group, while the second stage employs a high-pressure rate screw group. Surrounding each screw is a sealing air film, aiding in the compression process. The gas is compressed through three main stages: suction, pressurization, and exhaust.
First stage compression: The initial stage of the two-stage screw air compressor utilizes a low-pressure rate screw group, compressing the gas between them. The gas enters the screw compression chamber through the suction valve. With the high-speed rotation of the screw rotor, the gas is steadily compressed and transferred to the second stage.
Second stage compression: In the second stage screw group, gas enters a more confined screw space, experiencing higher temperature and pressure compression. The exhaust valve opens, releasing high-pressure gases from the system.
Natural air enters the first stage of compression through the air filter and mixes with a small amount of lubricating oil in the compression chamber. This mixed gas is simultaneously compressed to the interstage pressure. The compressed gas then enters the cooling channel, encountering a substantial amount of oil mist, which significantly reduces the temperature. The cooled compressed gas moves into the second-stage rotor, undergoes two-stage compression, and is finally compressed to the exhaust pressure. The entire compression cycle concludes with the gas being discharged via the exhaust valve.
| Sanzhi (Henan) Compressor Co,. Ltd. |
| Two-Stage Compression Permanent Magnet Variable Frequency Screw Air Compressor |
| Model |
Power |
Exhaust pressure |
Free air delivery* of unit at working pressure |
Voltage |
Frequency |
Air outlet discharge size |
Weight |
Dimensions |
| KW |
Mpa |
m³/min |
V |
Hz |
Inch |
Kg |
L*W*H(mm) |
| SZ15VF-II |
15 |
0.5 |
4.00 |
380 |
50 |
G1½ |
660 |
1450*780*1180 |
| 0.8 |
3.00 |
| 1.3 |
2.00 |
| SZ19VF-II |
18.5 |
0.5 |
5.00 |
380 |
50 |
G1½ |
680 |
1450*780*1180 |
| 0.8 |
4.00 |
| 1.3 |
3.80 |
| 1.6 |
2.20 |
| SZ22VF-II |
22 |
0.5 |
6.60 |
380 |
50 |
G1½ |
730 |
1650*880*1280 |
| 0.8 |
4.20 |
| 1.3 |
3.00 |
| 1.6 |
2.50 |
| SZ30VF-II |
30 |
0.5 |
7.00 |
380 |
50 |
G1½ |
980 |
2000*1260*1560 |
| 0.8 |
6.40 |
| 1.3 |
4.00 |
| 1.6 |
3.00 |
| SZ37VF-II |
37 |
0.5 |
10.00 |
380 |
50 |
G1½ |
1080 |
2000*1260*1560 |
| 0.8 |
7.00 |
| 1.3 |
5.50 |
| 1.6 |
4.00 |
| SZ45VF-II |
45 |
0.5 |
13.00 |
380 |
50 |
G2 |
1980 |
2000*1260*1560 |
| 0.8 |
10.00 |
| 1.3 |
6.50 |
| 1.6 |
5.00 |
| SZ55VF-II |
55 |
0.5 |
17.00 |
380 |
50 |
G2 |
2180 |
2150*1300*1730 |
| 0.8 |
12.00 |
| 1.3 |
8.60 |
| 1.6 |
5.00 |
| SZ75VF-II |
75 |
0.5 |
20.00 |
380 |
50 |
G2 |
2280 |
2150*1300*1730 |
| 0.8 |
16.50 |
| 1.3 |
11.00 |
| 1.6 |
9.00 |
| SZ90VF-II |
90 |
0.5 |
24.00 |
380 |
50 |
DN65 |
3200 |
2700*1920*1820 |
| 0.8 |
20.00 |
| 1.3 |
14.00 |
| 1.6 |
11.00 |
| SZ110VF-II |
110 |
0.5 |
28.00 |
380 |
50 |
DN65 |
3360 |
2700*1920*1820 |
| 0.8 |
24.50 |
| 1.3 |
18.00 |
| 1.6 |
14.00 |
| Due to product updates, the above parameters are subject to deviation in kind. |
The centrifugal fan is engineered with a high-speed rotating impeller that accelerates and decelerates the airflow. Air enters the impeller from the axial direction, leading to faster motor temperature reduction compared to conventional air-cooled fans. This ensures continuous compressor operation and significantly extends the compressor's service life.
1) High efficiency of PM motor:The constant torque and weak magnetic range are notably broader. The permanent magnet motor's efficiency surpasses that of regular motors by 20-30%. Regardless of operating away from the rated frequency, it maintains consistently high efficiency.
2) Motor maintenance-free:The permanent magnet motor is designed without bearings, thus eliminating the costs associated with bearing maintenance and replacement.
3) Integrated frequency converter:Equipped with China's premier frequency system, offering a vast speed regulation range and high precision. It adjusts the air compressor's operation based on actual gas demand, delivering exceptional energy-saving performance.
4) No transmission loss:Featuring an embedded integrated shaft directly connected structure between the permanent magnet motor and the compressor. This eliminates couplings and other transmission components, ensuring 100% transmission efficiency.
5) Variable frequency start and soft start:This feature substantially reduces the impact on power grid equipment, preventing damage to electrical devices.
6) Reduce energy consumption:With a frequency conversion range from 25% to 100% (unlike the 50% to 100% range of ordinary frequency converters), it offers energy savings of over 30% compared to fixed-speed air compressors. When compared to regular variable frequency air compressors, the energy-saving is around 5%, which is even more pronounced with significant system gas consumption fluctuations.
7) Two-stage compression unique air end:The two-stage compression screw machine boasts a unique air end design. It integrates the first-stage and second-stage compression rotors within a single case, each driven directly by gears to achieve optimal linear speeds, thereby enhancing compression efficiency.
8) Internal spray curtain cooling method:Employs a high energy-saving internal spray curtain cooling method, delivering excellent cooling effects. This significantly lowers the temperature of the compressed air, achieving near-isothermal compression, reduces pressure loss between stages, lowers compression ratios, and boosts compression efficiency.
9) Reduce internal leakage:The two-stage compression design lowers the compression ratio for each stage, reducing internal leakage from high-pressure to low-pressure ends, thereby improving volume efficiency.
10) Noise reduction:With two-stage compression, the compression ratio is reduced, substantially lowering noise levels, especially during unloading.
11) Easy maintenance and service:The two-stage compressor unit, aside from the screw air end, maintains similar systems and structures to single-stage compressors, facilitating user maintenance and service.
1. Unbeatable Price Advantage
We offer customers direct ex-factory prices, enhancing their market competitiveness and ensuring they receive the best value.
2. Straightforward Direct Deals
All products are supplied directly from our factory, guaranteeing more cost-effective solutions for our clients.
3. Comprehensive OEM & ODM Services
Our factory's formidable production and management capabilities enable us to provide exceptional OEM/ODM services tailored to your needs.
4. Personalized Customization Services
We cater to non-standard orders, export orders, and specific requirements such as voltage, power, and pressure. Contact us for any special demands.
5. Flexibility with Small Orders
Feel free to place a small trial order to evaluate the superior quality of our products.
6. Rapid Delivery
We ensure the timely delivery of high-quality products, meeting your deadlines consistently.
7. Full Authorization for Distributors
We provide complete authorization certificates for distributors, empowering you to confidently sell SANZHI brand products.
Sanzhi (Henan) Compressor Co., Ltd is a leading manufacturer with over a decade of expertise in screw air compressors and screw vacuum pumps. Our extensive product range encompasses normal pressure/low-pressure screw air compressors, permanent magnet frequency conversion screw air compressors, two-stage compression screw air compressors, screw air compressors for laser cutting, single-tank and double-tank mobile screw air compressors, as well as electric and diesel mobile screw air compressors, and screw vacuum pumps. We are dedicated to providing comprehensive solutions for all your compressed air needs.
Our production facilities are equipped with state-of-the-art multi-air compressor assembly lines, ensuring lean and modern manufacturing processes. With a dedicated team of over 50 employees, we continually optimize our ERP management systems to expedite lead times and ensure rapid delivery of high-quality products.
Our factory proudly holds ISO9001 quality management system certification. We adhere to stringent quality management protocols, rigorously following standard quality control procedures. Each machine undergoes meticulous material inspections, production checks, and pre-delivery evaluations to guarantee superior quality.
In the realm of customer service, our pre-sales team provides expert guidance on selecting the perfect air equipment for various facilities. We offer high customization options in appearance and configuration, and can even create unique OEM products to meet specific dealer demands. Our professional sales and service team is always on standby for quick and efficient after-sales support.
At Sanzhi (Henan) Compressor Co., Ltd, we are committed to delivering superior and stable products to build long-term relationships with our customers. Offering efficient delivery, high-quality machines, and competitive prices, we are your reliable partner for comprehensive compressed air solutions.
Our factory is located in Xinzheng City, Henan Province, China. Conveniently, we offer complimentary pick-up from Xinzheng International Airport, located just 30 kilometers away, ensuring a seamless visit to our facility. We warmly welcome you to our company!
FAQ
Q1. Are you a trading company or manufacturer?
A: We are a professional manufacturer specializing in screw air compressors, boasting over 10 years of industry experience.
Q2. How do you control quality?
A: 1. Rigorous inspection of raw materials.
2. Strict control of installation procedures.
3. Each machine undergoes no less than 5 hours of continuous testing before it leaves the factory.
Q3. What information must I provide to get the suitable machine?
1. Desired air delivery capacity (Unit: CFM or m³/Min)
2. Required working pressure (Unit: PSI, Bar or Mpa)
3. Voltage and frequency of your country (V/Hz)
4. Need for additional accessories such as an air tank, filters, and/or air dryers.
Provide us this information, and we will craft a tailored solution for you!
Q4. What is the general unit conversion?
1Bar = 0.1Mpa = 14.5PSI
1m³/min = 35.32cfm
1KW = 1.34HP
Q5. What is the available voltage air compressor?
A: Sanzhi compressors are available in various voltages: 380v/50hz/3p, 400v/50hz/3p, 415v/50hz/3p, 220v/60hz/3p, 440v/60hz/3p, and can be customized to meet your specific requirements.
Q6. How long is the delivery time?
A: For standard voltage orders, expect a swift 15-day turnaround following confirmation. For orders requiring non-standard specifications, kindly reach out to our dedicated sales team for a tailored timeline.
Q7. What's the payment term?
A: Our flexible payment terms include 30% T/T upfront, 40% T/T before shipment, and the remaining 30% T/T upon presentation of the B/L copy. Payments in USD or RMB are both accepted.
Q8. How about your warranty?
A: We offer a comprehensive warranty: one year for the entire machine and an extended two-year warranty for the screw air compressor, excluding consumable spare parts.
Q9. What about the maintenance?
A: The initial maintenance is required at 500 hours. Subsequently, routine maintenance should be performed every 2000-3000 hours, taking into account the specific operating environment.
Q10. Can machines be run in high-temperature environments?
A: Absolutely, our machines are engineered to perform efficiently in high-temperature conditions, with a working temperature range from -20°C to 45°C (-4°F to 113°F).
Q11. Do you offer OEM service?
A: Indeed, we welcome both OEM & ODM orders, supported by our expert design team to meet your specific requirements.
Q12. How long could your air compressor be used?
A: Generally, our air compressors are built to last over 10 years, ensuring long-term reliability and performance.
Q13. Will you provide some spare parts for the machines?
A: Certainly, we provide essential spare parts to ensure the seamless operation of your machines.
Q14. How about your after-sales service?
A: We offer comprehensive after-sales support, including online instructions for installation and commissioning, and we can arrange for our engineers to assist with training and on-site setup.
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