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 cutting-edge PM motor! Featuring expansive constant torque and weak magnetic ranges, it delivers an astounding 20-30% boost in efficiency compared to conventional motors. Beyond the rated frequency, our permanent magnet motor sustains its top-tier efficiency, ensuring superior performance at all times, in any setting.
2) Maintenance-Free Motor:Eliminate the costs and hassles of bearing maintenance and replacements. Our state-of-the-art permanent magnet motor is engineered without bearings, providing a truly maintenance-free operation that saves you both time and money.
3) Advanced Integrated Frequency Converter:Harness the power of China's leading frequency system with our unit, which offers extensive speed regulation and unrivaled precision. It adapts effortlessly to actual gas demand, delivering exceptional energy-saving performance with every use.
4) Zero Transmission Loss:Achieve complete transmission efficiency with our compact, integrated shaft connection. The direct drive structure eradicates couplings and other transmission components, ensuring zero transmission loss and maximizing operational efficiency.
5) Variable and Soft Start MechanismsShield your power grid equipment with our variable frequency start and soft start features. These functionalities minimize impact and safeguard electrical components, prolonging your machinery's lifespan.
6) Enhanced Energy Conservation:Our unit's frequency conversion range of 25% to 100%, as opposed to the typical 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 significant, making it perfect for diverse industrial needs.
7) Unique Two-Stage Compression Air End:Our pioneering two-stage compression screw design incorporates first and second-stage rotors within a single casing, with gears driving each stage to achieve optimal linear speeds. This significantly boosts overall compression efficiency and reliability.
8) Innovative Internal Spray Curtain Cooling:Our high-energy saving internal spray curtain cooling method drastically lowers compressed air temperature, achieving near-isothermal compression. This cutting-edge technique reduces pressure loss and enhances compression efficiency, setting new benchmarks in cooling technology.
9) Minimized Internal Leakage:Utilizing two-stage compression, we lower the compression ratio for each stage, effectively reducing internal leakage and improving volumetric efficiency. This ensures more reliable and consistent performance.
10) Superior Noise Reduction:Our two-stage compression process not only decreases the compression ratio but also significantly reduces noise levels, especially during unloading, providing a quieter and more comfortable working environment.
11) Effortless Maintenance and Service:Maintenance and service are effortless. Besides the advanced screw air end, our two-stage compressor's systems and structures are similar to single-stage units, ensuring user-friendly maintenance and operation, and minimizing downtime.
12) Removable Door Panels:The unit's casing, made of metal plate with noise reduction treatment, 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 easy access for maintenance personnel.
1. Unbeatable Price Advantage
Experience unparalleled value with our highly competitive ex-factory prices. Secure your place in the market with our cost-effective and premium offerings.
2. Direct Transactions
Benefit from seamless factory-direct deliveries, ensuring the most budget-friendly solutions reach you without any intermediaries.
3. Comprehensive OEM & ODM Services
Leveraging our robust production and management expertise, we flawlessly fulfill all your OEM and ODM service needs, guaranteeing precision and ultimate satisfaction.
4. Tailored Customization
We excel in catering to non-standard, export, and customized voltage/power/pressure orders. Share your unique requirements, and we will deliver solutions exquisitely tailored to your exact specifications.
5. Small Order Acceptance
Commence with a small trial order to personally witness the superior quality and exceptional performance of our products.
6. Rapid Delivery
Count on us for swift and timely delivery of top-notch products, ensuring your operations run smoothly without any 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, a renowned leader in the manufacturing sector, is celebrated for its exceptional screw air compressors and vacuum pumps. With over a decade of unwavering commitment, we offer an extensive array of standard and low-pressure screw air compressors, pioneering permanent magnet frequency conversion models, two-stage compression units, specialized compressors for laser cutting, and adaptable mobile screw compressors. Our product line includes single and double-tank configurations available in both electric and diesel options, along with cutting-edge screw vacuum pumps.
Our production processes epitomize modern efficiency, featuring cutting-edge multi-air compressor assembly lines. Supported by a proficient team of over 50 employees, we continuously enhance our ERP-based management systems, significantly shortening lead times and ensuring the swift delivery of top-tier products.
Committed to stringent quality standards, our facility proudly holds ISO9001 certification, underscoring our dedication to superior quality management. We enforce rigorous quality control measures, ensuring each machine undergoes comprehensive material inspections, production evaluations, and thorough pre-delivery checks before it departs from our facility.
Our unparalleled customer service ethos sets us apart. Our pre-sales team offers expert advice to help you select the ideal air equipment, supported by extensive customization options for appearance and configuration. We also excel in creating bespoke OEM products tailored to the specific needs of dealers. Our seasoned after-sales team guarantees rapid and effective responses to all customer inquiries and requirements.
At Sanzhi (Henan) Compressor Co., Ltd, we are devoted to delivering high-performance, reliable products that cultivate enduring customer relationships. Our efficient delivery schedules, exceptional 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 provide 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 with over a decade of professional experience in the industry.
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 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 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 specific requirements.
Q6. How long is the delivery time?
A: For our standard voltage specifications, expect a swift lead time of around 15 working days from order confirmation. If you require custom non-standard voltage specifications, please reach out to our dedicated sales team for a tailored 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 provide an industry-leading warranty: one year of comprehensive coverage for the entire machine and a two-year extended 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. Subsequent 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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