Introducing the groundbreaking Low-Pressure Compressor by Sanzhi (Henan) Compressor Co., Ltd.! This state-of-the-art Two-Stage Compression Permanent Magnet Variable Frequency Drive Screw Air Compressor is meticulously engineered to elevate industrial excellence. Available in an extensive range of power options-including 15KW, 22KW, 30KW, 37KW, 45KW, 55KW, 75KW, 90KW, 110KW, 132KW, 160KW, 185KW, 200KW, and 250KW-this versatile machine ensures unmatched efficiency and reliability. Transform your operations with this cutting-edge solution, designed to meet the diverse and demanding needs of today's modern industries.
Internal Structure Frontside
Internal Structure Backside
Working Principle
In an ideal air compression scenario, the energy required for single-stage pressure transmission equates to the combined energy demands of multi-stage compression. Realistically, however, factors such as coupling power losses, bearing friction, and the cooling effects of fluid viscosity result in higher operational power requirements. Reducing the compression ratio at each stage minimizes these inefficiencies. Consequently, the total power consumption for multi-stage compression is lower than that of single-stage compression.
Our cutting-edge two-stage screw air compressor features a sophisticated twin-stage rotary screw mechanism. This advanced system includes an active screw in each stage driving a passive screw via a robust external power transmission setup. The first stage uses a low-pressure screw group, while the second stage employs a high-pressure screw group. Every screw is encased within a sealing air film. As they rotate, the gas undergoes a tri-phase process: suction, pressurization, and exhaust, ensuring optimal compression efficiency.
First Stage Compression: Equipped with a low-pressure screw group, the initial stage of the two-stage screw air compressor compresses the gas efficiently. Gas is drawn into the compression chamber through the suction valve, where the high-speed rotation of the screw rotor compresses it before transferring it to the second stage.
Second Stage Compression: Within the second stage screw group, the gas is further compressed in a more confined screw space, reaching higher temperatures and pressures. The exhaust valve then opens, releasing the high-pressure gases from the system and completing the compression process.
Natural air is initially drawn through the air filter into the first compression stage, where it merges with a small quantity of lubricating oil. This mixture is compressed to an intermediate pressure. Following this, the gas enters a cooling channel, interacting with a substantial amount of oil mist that significantly lowers its temperature. The cooled, compressed gas then advances to the second-stage rotor for final compression to the ultimate exhaust pressure. The process culminates as the fully compressed gas exits the system through the exhaust valve, completing the compression cycle.
1) High efficiency of PM motor:Experience unparalleled efficiency with our advanced permanent magnet motor. Its constant torque range and weak magnetic range are significantly wider, delivering an efficiency boost of 20-30% over conventional motors. Even when operating away from the rated frequency, the motor sustains its high efficiency, ensuring optimal performance at all times.
2)Two-stage compression unique air end:Our revolutionary two-stage compression screw machine features a uniquely designed air end. The first and second-stage compression rotors are combined within a single casing and driven directly by gears, enabling each rotor to achieve the optimal linear speed and thereby maximizing compression efficiency.
3)Integrated frequency converter: Equipped with China's premier frequency system, the air compressor offers a wide range of speed regulation and high precision. Users can modulate the frequency according to actual gas demand, leading to remarkable energy savings and operational efficiency.
4)Reduce internal leakage:Employing two-stage compression technology reduces the compression ratio for each stage, thereby minimizing internal leakage from the high-pressure end to the low-pressure end while significantly enhancing volumetric efficiency.
5)Variable frequency start and the soft startof the motor are achieved, significantly reducing the impact on power grid equipment and preventing damage to electrical components.
6)Reduce energy consumption: Our frequency conversion operates from 25% to 100%, a significant improvement over the ordinary 50% to 100% range. Compared to fixed-speed air compressors, energy savings can exceed 30%. Even against regular variable frequency compressors, it offers around 5% more energy efficiency, with greater savings for systems with fluctuating gas demands.
7)No transmission loss: The permanent magnet motor and compressor utilize an embedded integrated shaft direct connection structure, making it more compact. With no couplings or other transmission parts, the transmission efficiency reaches an unparalleled 100%.
8)Air cooling method: Our high energy-efficient air cooling method delivers excellent cooling performance, significantly reducing the temperature of compressed air. This near-isothermal compression also minimizes pressure loss between stages, reducing the compression ratio and enhancing overall efficiency.
9)Smart Touch Controller:Our state-of-the-art built-in intelligence requires minimal manual operation. Featuring a high-precision color electronic screen, it provides clear graphical displays, maintenance information, fault alarms, and safety shutdown alerts for seamless operation.
10)Special Type Intake Valve:Automatically controlled opening ensures smooth engine fuel injection and lubricating oil circulation.
Ultra-low oil circuit loss enhances overall efficiency.
The normally open solenoid valve automatically closes during emergency stops to prevent oil injection, ensuring system safety.
11)Excellent Air Filter:Our top-tier air filter boasts exceptional air purification capabilities, ensuring a clean air system with three-stage filtration for superior air quality. It efficiently removes steam and dust, meeting stringent emission standards.
12)High-Quality Soundproof Cotton:Our compact noise reduction housing, coupled with high-quality soundproof cotton, minimizes operational vibration and significantly enhances noise reduction, ensuring a quieter, more efficient workspace.
13)Motor maintenance-free:Our permanent magnet motor, free of internal bearings, eliminates the need for motor bearing maintenance and replacement, reducing long-term maintenance costs and enhancing reliability.
14)Noise reduction:Experience unparalleled tranquility with our state-of-the-art two-stage compression technology. This advanced system significantly lowers the compression ratio, dramatically reducing operational noise, especially during unloading. Revel in a quieter, more efficient working environment.
15) Effortless Maintenance and Service:Our innovative two-stage compressor unit preserves the familiar structure and systems of a single-stage compressor. By excluding only the screw air end, we ensure that maintenance and service remain straightforward and user-friendly for everyone, allowing for hassle-free upkeep and consistent performance.
| 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. |
1. Competitive Pricing
Experience unbeatable rates by sourcing directly from us, ensuring you stay ahead in the competitive market with factory-direct prices.
2. Direct Transactions
Benefit from superior cost-effectiveness and direct sourcing as all our products are supplied straight from the factory to you.
3. OEM & ODM Services
Leverage our robust production and management capabilities to receive bespoke OEM and ODM services tailored precisely to your requirements.
4. Customized Solutions
We cater to non-standard and export orders with specific voltage, power, and pressure needs. Reach out with your customization requests.
5. Small Order Acceptance
Begin with a small trial order to experience the exceptional quality of our products firsthand.
6. Rapid Delivery
Receive high-quality products swiftly and on time, ensuring your operations run seamlessly without any interruptions.
7. Comprehensive Authorization
Empower your distribution with full authorization certificates, allowing you to confidently market and sell SANZHI brand products.
Sanzhi (Henan) Compressor Co., Ltd is a prestigious manufacturer specializing in the production of screw air compressors and screw vacuum pumps. With over a decade of industry expertise, we offer a comprehensive product range that includes normal pressure and low-pressure screw air compressors, permanent magnet frequency conversion screw air compressors, two-stage compression screw air compressors, screw air compressors designed for laser cutting, single-tank and double-tank mobile screw air compressors, electric and diesel mobile screw air compressors, and screw vacuum pumps.
Our state-of-the-art production facility utilizes multi-air compressor assembly lines to ensure unparalleled efficiency. Backed by a dedicated team of over 50 employees, we continuously refine our management systems, such as ERP, to minimize lead times and ensure rapid delivery of top-quality products.
Our management systems are designed to uphold the highest standards of quality. Certified under the ISO9001 quality management system, we rigorously follow strict quality control protocols. Every machine undergoes thorough inspections at various stages, from material and production checks to pre-delivery evaluations, guaranteeing unmatched product reliability.
In terms of customer service, our pre-sales team provides expert guidance on selecting the ideal air equipment for diverse facilities and offers extensive customization options, including appearance and configuration. We even create bespoke products to meet specific dealer demands through our OEM services. Our professional sales and service team is always ready to offer prompt support post-sales, ensuring swift responses to any customer needs.
At Sanzhi (Henan) Compressor Co., Ltd, we are committed to delivering superior, reliable, and stable products, aiming to forge long-term relationships with our clients. Our promise includes efficient delivery, high-quality machinery, and competitive pricing, ensuring you receive an optimal compressed air solution.
Nestled in Xinzheng City, Henan Province, China, our factory is conveniently located just 30 kilometers away from Xinzheng International Airport, approximately one hour's drive. We warmly welcome you to visit our facility and experience our offerings firsthand!
FAQ
Q1. Are you a trading company or manufacturer?
A: We are a distinguished manufacturer specializing in screw air compressors, proudly boasting over a decade of industry expertise.
Q2. How do you control quality?
A: 1. Our raw materials undergo rigorous inspection to ensure the highest quality.
2. The meticulous installation process is stringently monitored.
3. Every machine is subjected to a minimum of 5 continuous hours of testing before dispatch to ensure optimal performance.
Q3. What information must I provide to get the suitable machine?
1. Your required air delivery capacity (Unit: CFM or m³/Min).
2. The desired working pressure (Unit: PSI, Bar or Mpa).
3. The voltage and frequency specifications of your country of residence (V/Hz).
4. Any additional accessories needed, such as an air tank, filters, or air dryers.
Share this information with us, and we will tailor a perfect 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 offers a range of voltages including 380v/50hz/3p, 400v/50hz/3p, 415v/50hz/3p, 220v/60hz/3p, 440v/60hz/3p, with customization options to meet your specific requirements.
Q6. How long is the delivery time?
A: For standard voltage units, delivery is within 15 working days post order confirmation. For non-standard requirements, please contact our sales team.
Q7. What's the payment term?
A: Payment terms include 30% T/T in advance, 40% T/T before shipment, and the remaining 30% T/T upon B/L copy. Payments can be made in USD or RMB.
Q8. How about your warranty?
A: We offer a comprehensive warranty of one year for the entire machine and two years for the screw air compressor, excluding consumable spare parts.
Q9. What about the maintenance?
A: The initial maintenance is required after 500 hours of operation. Subsequent maintenance should be performed every 2000-3000 hours, taking into account the actual working environment.
Q10. Can machines be run in high-temperature environment?
A: Absolutely, our machines are designed to operate efficiently in high-temperature environments, with a working temperature range from -20° to 45° (-4ºF to 113ºF).
Q11. Do you offer OEM service?
A: Yes, we excel in both OEM & ODM services, backed by our professional design team. Your custom orders are highly welcomed.
Q12. How long could your air compressor be used?
A: Our air compressors are engineered for longevity, typically exceeding 10 years of service life.
Q13. Will you provide some spare parts for the machines?
A: Certainly, we offer an extensive selection of spare parts to guarantee the seamless and efficient operation of your machinery.
Q14. How about your after-sales service?
A: We provide exceptional after-sales support, encompassing online installation and commissioning guidance. Additionally, we can dispatch engineers for hands-on training and installation assistance as required.
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