Internal Structure Frontside
Internal Structure Backside
Working Principle
In an ideal air compression scenario, the energy required for single-stage pressure transmission equals the cumulative energy needed for multi-stage compression. However, in real-world applications, factors such as coupling transmission losses, bearing friction, and the cooling effect of viscosity increase the actual operational power needed. By reducing the compression ratio at each stage, we can significantly lower the overall power consumption in multi-stage compression, making it more efficient than single-stage compression.
The two-stage screw air compressor from Sanzhi (Henan) Compressor Co., Ltd. is engineered with a dual-stage rotary screw system, featuring active and passive screws at each stage. The active screw propels the passive screw through an external power mechanism, optimizing performance. The first stage uses a low-pressure rate screw group, while the second stage employs a high-pressure rate screw group, each enveloped by a sealing air film. During operation, the air undergoes three crucial processes: suction, pressurization, and exhaust.
First Stage Compression: In the initial phase of the two-stage screw air compressor, a low-pressure rate screw group compresses the gas between the screws. The gas is drawn into the compression chamber via the suction valve. As the screw rotor spins at high speed, the gas is gradually compressed and transported to the next stage, ensuring optimal efficiency.
Second Stage Compression: During this stage, the gas enters a more confined screw space, leading to elevated temperatures and pressures. The exhaust valve then opens, releasing the high-pressure gases from the system, thus completing the second stage of compression.
Natural air is initially drawn into the first compression stage through an air filter, where it mixes with a small amount of lubricating oil. This mixture is compressed to an interstage pressure before passing through a cooling channel, where significant oil mist substantially reduces its temperature. The cooled gas then enters the second-stage rotor for further compression, achieving the final exhaust pressure. Ultimately, the compressor expels the gas through the exhaust valve, completing the entire compression cycle with remarkable efficiency.
| 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 unprecedented efficiency with our PM motor! Its wide-ranging constant torque and weak magnetic ranges deliver an impressive 20-30% higher efficiency than traditional motors. Beyond the rated frequency, our permanent magnet motor maintains its superior efficiency, ensuring exceptional performance anytime, anywhere.
2) Maintenance-Free Motor:Say goodbye to costly bearing maintenance and replacements. Our innovative permanent magnet motor is designed without bearings, ensuring a truly maintenance-free experience, saving you time and money.
3) Advanced Integrated Frequency Converter:Equipped with China's premier frequency system, our unit offers extensive speed regulation and unparalleled precision. It adapts seamlessly to actual gas demand, delivering remarkable energy-saving performance with every use.
4) Zero Transmission Loss:Achieve 100% transmission efficiency with our compact, integrated shaft connection. The direct drive structure eliminates couplings and other transmission components, ensuring zero transmission loss and maximizing operational efficiency.
5) Variable and Soft Start MechanismsProtect your power grid equipment with our variable frequency start and soft start functionalities. These features minimize impact and prevent damage to electrical components, ensuring a longer lifespan for your machinery.
6) Enhanced Energy Conservation:Our unit's frequency conversion range of 25% to 100%, compared to the ordinary 50%-100%, results in over 30% energy savings compared to fixed-speed compressors. In systems with fluctuating gas consumption, the energy-saving impact is even more substantial, making it ideal for varied industrial needs.
7) Unique Two-Stage Compression Air End:Our innovative two-stage compression screw design integrates first and second-stage rotors within a single casing, with gears driving each stage to achieve optimal linear speeds, significantly enhancing overall compression efficiency and reliability.
8) Innovative Internal Spray Curtain Cooling:Our high-energy saving internal spray curtain cooling method significantly reduces compressed air temperature, achieving nearly isothermal compression. This innovative approach reduces pressure loss and enhances compression efficiency, setting new standards in cooling technology.
9) Minimized Internal Leakage:By utilizing two-stage compression, we lower the compression ratio for each stage, effectively reducing internal leakage and improving volumetric efficiency. This results in more reliable and consistent performance.
10) Superior Noise Reduction:Our two-stage compression process not only reduces the compression ratio but also significantly lowers noise levels, particularly during unloading, ensuring a quieter and more comfortable working environment.
11) Effortless Maintenance and Service:Maintenance and service are a breeze. Apart from the advanced screw air end, our two-stage compressor's systems and structures are akin to single-stage units, ensuring user-friendly maintenance and operation, and reducing downtime.
12) Door panels are removable:The unit's casing is made of metal plate with noise reduction treatment, and the casing panel is equipped with high-density sound-absorbing material, ensuring the noise level meets international standards. The door plate can be opened and disassembled, offering a 270-degree all-round space, facilitating maintenance personnel access to the inside of the unit.
1. Unbeatable Price Advantage
Experience unparalleled value with our highly competitive ex-factory prices. Stay ahead in the competitive market with our cost-effective offerings.
2. Direct Transactions
Benefit from factory-direct deliveries, ensuring the most budget-friendly solutions reach you without intermediaries.
3. Comprehensive OEM & ODM Services
With our robust production and management expertise, we flawlessly fulfill all your OEM and ODM service needs, guaranteeing precision and satisfaction.
4. Tailored Customization
We cater to non-standard, export, and customized voltage/power/pressure orders. Share your unique requirements, and we will deliver solutions tailored to your exact specifications.
5. Small Order Acceptance
Start with a small trial order to witness the superior quality and performance of our products firsthand.
6. Rapid Delivery
Count on us for swift and timely delivery of top-notch products, ensuring your operations run smoothly without delays.
7. Comprehensive Authorization
Empower your business as a valued distributor with our complete authorization certification, enabling you to confidently market and sell our prestigious SANZHI brand products.
Sanzhi (Henan) Compressor Co., Ltd, an established powerhouse in the manufacturing realm, excels in crafting superior screw air compressors and vacuum pumps, with over ten years of unwavering dedication. Our extensive range includes standard and low-pressure screw air compressors, advanced permanent magnet frequency conversion models, two-stage compression units, specialized compressors for laser cutting, and versatile mobile screw compressors. We offer single and double-tank configurations in both electric and diesel options, as well as innovative screw vacuum pumps.
Our production processes are a testament to efficiency and modernity, featuring state-of-the-art multi-air compressor assembly lines. With a team of over 50 proficient employees, we continually refine our ERP-based management systems, significantly reducing lead times and guaranteeing the prompt delivery of superior quality products.
Adhering to rigorous standards, our factory proudly holds ISO9001 certification, underscoring our commitment to quality management. We meticulously enforce stringent quality control measures, ensuring each machine undergoes comprehensive material inspections, production evaluations, and thorough pre-delivery checks before it leaves our facility.
Our customer service ethos is unparalleled. Our pre-sales team offers expert advice to help you choose the perfect air equipment, backed by extensive customization options for appearance and configuration. We also excel in creating bespoke OEM products tailored to specific dealer requirements. Our after-sales team, comprised of seasoned professionals, guarantees rapid and effective responses to all customer inquiries and needs.
At Sanzhi (Henan) Compressor Co., Ltd, we are committed to delivering high-performance, reliable products that foster lasting customer relationships. Our efficient delivery schedules, top-notch machines, and competitive pricing ensure you receive outstanding compressed air solutions every time.
Conveniently located in Xinzheng City, Henan Province, China, our factory is easily accessible. We offer complimentary transportation from Xinzheng International Airport to our premises, a brief 30-kilometer journey that takes approximately one hour. We warmly welcome your visit!
FAQ
Q1. Are you a trading company or manufacturer?
A: We are a dedicated manufacturer specializing in screw air compressors, boasting over a decade of professional experience.
Q2. How do you control quality?
A: 1. Strict inspection of raw materials.
2. Rigorous control of installation procedures.
3. Each machine undergoes a minimum of 5 hours of continuous testing before dispatch.
Q3. What information must I provide to get the suitable machine?
1. The required air delivery capacity (Unit: CFM or m³/Min).
2. The necessary working pressure (Unit: PSI, Bar, or Mpa).
3. The voltage and frequency of your location (V/Hz).
4. Any additional accessories needed, such as an air tank, filters, or air dryers.
Provide us with these details, and we will tailor a 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 compressors in voltages of 380V/50Hz/3P, 400V/50Hz/3P, 415V/50Hz/3P, 220V/60Hz/3P, 440V/60Hz/3P, and can customize according to your requirements.
Q6. How long is the delivery time?
A: For our standard voltage specifications, you can anticipate a swift lead time of approximately 15 working days post order confirmation. Should you need custom non-standard voltage specifications, please contact our dedicated sales team for a personalized delivery schedule.
Q7. What's the payment term?
A: Our payment terms are designed to be straightforward and secure: an initial 30% T/T deposit in advance, followed by 40% T/T before shipment, with the remaining 30% T/T due upon receipt of the B/L copy. We accept payments in both USD and RMB for your convenience.
Q8. How about your warranty?
A: We offer an industry-leading warranty, which includes one year of comprehensive coverage 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: Initial maintenance should be conducted after 500 hours of operation. Subsequently, routine maintenance intervals are recommended between 2000-3000 hours, depending on specific working conditions, to ensure optimal performance.
Q10. Can machines be run in high-temperature environment?
A: Absolutely, our machines are meticulously engineered to perform efficiently even in high-temperature environments, with an operational temperature range from -20° to 45° (-4ºF to 113ºF).
Q11. Do you offer OEM service?
A: Yes, we offer both OEM and ODM services. Our professional design team is committed to providing flexible solutions to meet your specific requirements.
Q12. How long could your air compressor be used?
A: Our air compressors are engineered for exceptional durability, typically offering a lifespan that exceeds 10 years.
Q13. Will you provide some spare parts for the machines?
A: Yes, we ensure the availability of spare parts for all our machines to guarantee seamless operation.
Q14. How about your after-sales service?
A: We provide comprehensive after-sales support, including online guidance for installation and commissioning. Additionally, we can dispatch experienced engineers for on-site training and installation assistance to ensure your satisfaction.
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