Introducing Sanzhi (Henan) Compressor Co., Ltd.'s groundbreaking Low-Pressure Compressor! This innovative Two-Stage Compression Permanent Magnet Variable Frequency Drive Screw Air Compressor is meticulously engineered for industrial excellence. Available in a versatile range of power options including 15KW, 22KW, 30KW, 37KW, 45KW, 55KW, 75KW, 90KW, 110KW, 132KW, 160KW, 185KW, 200KW, and 250KW, it delivers unparalleled efficiency and reliability. Elevate your operations with this state-of-the-art solution designed to meet the diverse demands of modern industry.
Internal Structure Frontside
Internal Structure Backside
Working Principle
During the ideal air compression process, the power needed for single-stage pressure transmission matches the sum needed for multiple-stage compression. However, due to factors like coupling transmission power loss, bearing friction, and liquid viscosity cooling effects, the actual working power is higher. By minimizing the compression ratio of each stage, power inefficiencies are reduced, making the total power for multi-stage compression less than that of single-stage compression.
The two-stage screw air compressor is an advanced system consisting of a two-stage rotary screw mechanism. Each stage features an active screw that drives a passive screw via an external power transmission device. The first stage employs a low-pressure screw group, while the second stage uses a high-pressure screw group. Each screw is enveloped by a sealing air film. As the screws rotate, the gas is subjected to three processes: suction, pressurization, and exhaust, resulting in efficient compression.
First Stage Compression: The first stage of the two-stage screw air compressor utilizes a low-pressure screw group to compress gas. Gas enters the compression chamber through the suction valve and is squeezed by the high-speed rotation of the screw rotor, then transferred to the second stage.
Second Stage Compression: In the second stage screw group, the gas is compressed further within a tighter screw space, achieving higher temperatures and pressures. The exhaust valve then opens to release the high-pressure gases from the system, completing the compression.
Natural air is drawn through the air filter into the first compression stage, where it mixes with a small amount of lubricating oil. This mixture is compressed to an interstage pressure. The gas then enters the cooling channel and interacts with a large amount of oil mist, significantly reducing its temperature. Cooled and compressed, the gas moves to the second-stage rotor for final compression to the ultimate exhaust pressure. The process culminates as the fully compressed gas exits through the exhaust valve, finalizing 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 two-stage compression technology, which significantly lowers the compression ratio, leading to a dramatic reduction in operational noise, especially during unloading.
15)Easy to do maintenance and service:Our two-stage compressor unit retains the familiar structure and systems of a single-stage compressor, excluding the screw air end, ensuring that maintenance and service remain straightforward and user-friendly for all.
| 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
We offer direct factory prices to our customers, ensuring you stay ahead of the competition with unbeatable rates.
2. Direct Transactions
All our products are supplied straight from the factory, promising superior cost-effectiveness and direct sourcing.
3. OEM & ODM Services
Our strong production and management capabilities allow us to provide comprehensive OEM/ODM services tailored to your needs.
4. Customized Solutions
We accept non-standard orders including export orders with specific voltage, power, and pressure requirements. Contact us with your customization needs.
5. Small Order Acceptance
Start with a small trial order to evaluate the exceptional quality of our products.
6. Rapid Delivery
Enjoy high-quality products with prompt and timely delivery, ensuring your operations never miss a beat.
7. Comprehensive Authorization
For our valued distributors, we provide complete authorization certificates, empowering you to market and sell SANZHI brand products with confidence.
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 provide an array of spare parts to ensure the smooth operation of your machines.
Q14. How about your after-sales service?
A: We offer comprehensive after-sales support, including online installation and commissioning guidance, and can arrange engineers for training and installation assistance as needed.
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