Internal Structure Frontside
Internal Structure Backside
Working Principle
In an optimal air compression scenario, the energy required for single-stage pressure transmission equals the total energy for multi-stage compression. However, real-world conditions such as coupling transmission losses, bearing friction, and cooling effects from viscosity increase operational power. By minimizing the compression ratio at each stage, overall power consumption in multi-stage compression is reduced, making it significantly more efficient than single-stage compression.
The two-stage screw air compressor boasts a dual-stage rotary screw system, each stage featuring an active and passive screw. The active screw drives the passive screw through an external power source. The first stage employs a low-pressure screw group, while the second stage uses a high-pressure screw group. Each screw is surrounded by a sealing air film. During rotation, air undergoes three fundamental processes: suction, pressurization, and exhaust.
First Stage Compression: The initial stage of the two-stage screw air compressor utilizes a low-pressure screw group to compress the gas. The gas is drawn into the compression chamber via the suction valve. As the screw rotor spins rapidly, the gas is incrementally compressed and moved to the next stage.
Second Stage Compression: In this stage, the gas enters a more confined screw space, experiencing heightened temperatures and pressures. The exhaust valve then opens, expelling the high-pressure gases from the system.
Natural air is drawn into the first compression stage through an air filter, where it mixes with a small amount of lubricating oil and is compressed to an interstage pressure. The compressed gas then passes through a cooling channel, encountering significant oil mist, which substantially reduces its temperature. This cooled gas enters the second-stage rotor for further compression, reaching the final exhaust pressure. Ultimately, the compressor expels the gas through the exhaust valve, completing the entire compression cycle.
| 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. |
1) Unparalleled Efficiency of PM Motor:Experience a leap in performance with our PM motor, boasting a vastly expanded constant torque and weak magnetic range. Delivering 20-30% greater efficiency than standard motors, it excels even beyond the rated frequency, ensuring peak performance continuously.
2) Maintenance-Free Motor:Engineered for longevity, our permanent magnet motor is free from bearings, eliminating the need for costly maintenance and replacements.
3) Advanced Integrated Frequency Converter:Equipped with China's premier frequency system, this converter provides extensive speed regulation and precision. It smartly adjusts to actual gas demands, offering remarkable energy savings.
4) Zero Transmission Loss:Thanks to the compact, integrated shaft connection between the permanent magnet motor and compressor, our design eliminates couplings and other transmission parts, ensuring flawless 100% transmission efficiency.
5) Variable and Soft Start Mechanisms:Our variable frequency start and soft start capabilities significantly mitigate impacts on power grid equipment, safeguarding electrical components from damage.
6) Enhanced Energy Conservation:With an expansive frequency conversion range of 25% to 100% (vs. the typical 50%-100%), this unit achieves over 30% energy savings compared to fixed-speed compressors. In systems with variable gas consumption, the energy savings are even more impressive.
7) Unique Two-Stage Compression Air End:Our innovative two-stage compression screw design integrates first and second-stage rotors within a single casing, driven by gears to optimize linear speeds, thus maximizing compression efficiency.
8) Innovative Internal Spray Curtain Cooling:Utilizing a high-efficiency internal spray curtain cooling system, our compressor dramatically reduces air temperature, achieving near-isothermal compression. This technique minimizes pressure loss and boosts compression efficiency.
9) Minimized Internal Leakage:Adopting a two-stage compression reduces the compression ratio per stage, significantly cutting down internal leakage and enhancing volumetric efficiency.
10) Superior Noise Reduction:Our two-stage compression not only lowers the compression ratio but also markedly decreases noise levels, especially during unloading.
11) Effortless Maintenance and Service:Designed for ease, the systems and structures of our two-stage compressor largely mirror those of single-stage units, ensuring user-friendly maintenance and operation.
1. Unbeatable Price Advantage
We deliver competitive ex-factory prices directly to you, ensuring you can lead the market with our cost-effective solutions.
2. Direct Factory Transactions
All products come directly from our factory, allowing us to offer you more economical and effective options.
3. Comprehensive OEM & ODM Services
Leverage our robust production and management capabilities to seamlessly meet all your OEM/ODM service needs.
4. Tailored Customization Services
We specialize in non-standard, export, voltage/power/pressure custom orders. Share your specific requirements with us, and we will deliver tailored solutions to meet your demands.
5. Acceptance of Small Orders
Begin with a small trial order to experience the premium quality and reliability of our products firsthand.
6. Rapid and Timely Delivery
We guarantee the timely delivery of our high-quality products, ensuring your operations remain uninterrupted and smooth.
7. Comprehensive Distributor Authorization
For our distributors, we provide full authorization certification, empowering you to confidently sell our esteemed SANZHI brand products.
Sanzhi (Henan) Compressor Co., Ltd. stands as a distinguished leader in the manufacture of screw air compressors and screw vacuum pumps, bringing over a decade of unparalleled industry expertise. Our extensive and diverse product range includes everything from normal pressure and low-pressure screw air compressors to permanent magnet frequency conversion screw air compressors, two-stage compression screw air compressors, and specialized screw air compressors for laser cutting. We also offer single-tank and double-tank mobile screw air compressors, both electric and diesel variants, as well as high-efficiency screw vacuum pumps. Our commitment to innovation and quality ensures that we meet the evolving needs of our clients across various applications.
Our state-of-the-art production facility is a testament to our commitment to efficiency and excellence. Equipped with advanced, lean multi-air compressor assembly lines, we optimize every stage of production. Backed by a dedicated team of over 50 skilled employees, we continually refine our management systems, including ERP integration, to minimize lead times and facilitate the rapid delivery of premium-quality products. This streamlined approach enables us to meet the high demands of our discerning clientele with utmost precision and reliability.
Quality management is at the heart of our operations at Sanzhi (Henan) Compressor Co., Ltd. Our factory proudly holds the ISO9001 certification, underscoring our commitment to maintaining stringent quality control measures. Each machine undergoes rigorous inspections, encompassing material checks, detailed production evaluations, and meticulous pre-delivery assessments. This ensures that every product that leaves our facility meets the highest standards of performance and reliability.
Our exceptional customer service spans from pre-sales to after-sales support, ensuring a seamless experience for our clients. Before purchase, we offer expert guidance to help you select the ideal air equipment, along with high levels of customization, including unique OEM products tailored to meet specific dealer requirements. Post-purchase, our professional sales and service team remains on standby to respond promptly to any customer needs, guaranteeing ongoing satisfaction and support.
At Sanzhi (Henan) Compressor Co., Ltd., our mission is to deliver superior, dependable products while fostering long-term relationships with our customers. We pride ourselves on our efficient delivery, exceptional quality, and competitive pricing, making us your trusted partner for all compressed air solutions. Our dedication to innovation and excellence positions us as a leader in the industry, committed to meeting and exceeding your expectations.
Conveniently located in Xinzheng City, Henan Province, China, our factory is easily accessible. We offer complimentary transportation from Xinzheng International Airport to our facility, which is just 30 kilometers away, ensuring a smooth and hassle-free journey of approximately one hour. We eagerly anticipate your visit and look forward to welcoming you to our company!
FAQ
Q1. Are you a trading company or manufacturer?
A: We are a professional manufacturer of screw air compressors, boasting over 10 years of rich industry experience.
Q2. How do you control quality?
A: 1. We conduct stringent inspections of all raw materials to ensure top-quality inputs.
2. We maintain strict control over every installation procedure to ensure flawless assembly.
3. Each machine undergoes a minimum of 5 hours of continuous, rigorous testing before dispatch to guarantee optimal performance.
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 in your country (V/Hz).
4. Additional accessories needed, such as air tanks, filters, or air dryers.
Provide us with this information, and we will tailor a solution perfectly suited to your needs!
Q4. What is the general unit conversion?
1Bar = 0.1Mpa = 14.5PSI
1m³/min = 35.32cfm
1KW = 1.34HP
Q5. What are the available voltage options for air compressors?
A: Sanzhi air compressors come in various voltage options: 380v/50hz/3p, 400v/50hz/3p, 415v/50hz/3p, 220v/60hz/3p, and 440v/60hz/3p. Further customization options are available to meet your specific requirements.
Q6. How long is the delivery time?
A: For standard voltage, our delivery time is an impressive 15 working days post-confirmation of your order. For non-standard requirements, please reach out to our dedicated sales team for tailored assistance.
Q7. What's the payment term?
A: We accept 30% T/T in advance, 40% T/T before shipment, and the final 30% T/T upon receipt of the B/L copy. Payments are accepted in both USD and RMB.
Q8. How about your warranty?
A: We offer an extensive one-year warranty for the entire machine and an additional two-year warranty specifically for the screw air compressor, excluding consumable spare parts.
Q9. What about the maintenance?
A: The initial maintenance should be performed after the first 500 hours of operation. Thereafter, regular maintenance is recommended every 2000-3000 hours, depending on the actual working environment.
Q10. Can machines be run in high-temperature environment?
A: Absolutely, our machines are meticulously engineered to operate efficiently in high-temperature environments, sustaining a working temperature range from -20° to 45° (-4ºF to 113ºF).
Q11. Do you offer OEM service?
A: Yes, we proudly offer both OEM & ODM services. With the expertise of our design team, customized orders are highly welcomed.
Q12. How long could your air compressor be used?
A: Our air compressors are built to last and can typically be used for more than 10 years.
Q13. Will you provide some spare parts for the machines?
A: Certainly, we provide essential spare parts to ensure the seamless and uninterrupted operation of your machines.
Q14. How about your after-sales service?
A: We offer comprehensive after-sales support, including online installation and commissioning instructions. Additionally, we can arrange for our skilled engineers to assist with training and installation as needed.
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