Internal Structure Frontside
Internal Structure Backside
Working Principle
In an ideal air compression scenario, the energy required for single-stage compression equals the total energy needed for multi-stage compression. However, real-world factors like coupling transmission losses, bearing friction, and cooling effects from viscosity increase the actual power consumption. By reducing the compression ratio at each stage, we can significantly lower overall power usage, making multi-stage compression far more efficient than single-stage compression.
Our two-stage screw air compressor boasts an advanced dual-stage rotary screw system, comprising active and passive screws at each stage. The active screw drives the passive screw using an external power mechanism. The first stage features a low-pressure rate screw group, while the second stage utilizes a high-pressure rate screw group. Each screw is encased in a sealing air film. During operation, the air undergoes three critical processes: suction, pressurization, and exhaust, ensuring superior performance and efficiency.
First Stage Compression: In the initial stage, the low-pressure rate screw group compresses the gas between the screws. The gas is drawn into the compression chamber through the suction valve. As the screw rotor rotates at high speed, the gas is gradually compressed and then transferred to the next stage, setting the foundation for efficient multi-stage compression.
Second Stage Compression: Here, the gas enters a more confined screw space, encountering increased temperatures and pressures. Subsequently, the exhaust valve opens to release the high-pressure gases from the system, completing the compression process with enhanced efficiency and effectiveness.
Natural air enters the first compression stage through an air filter, combining with a small amount of lubricating oil. This mixture is initially compressed to an interstage pressure. The compressed gas then travels through a cooling channel, encountering significant oil mist, which markedly reduces its temperature. The cooled gas then proceeds to the second-stage rotor for final compression, achieving the desired exhaust pressure. Finally, the compressor expels the gas through the exhaust valve, completing the efficient and reliable 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 an industry-leading leap in efficiency with our PM motor! Its dynamic constant torque and weak magnetic ranges yield a remarkable 20-30% efficiency gain over traditional motors. Even beyond the rated frequency, our permanent magnet motor sustains its peak efficiency, delivering top-tier performance under all conditions.
2) Maintenance-Free Motor:Eliminate the hassle and cost of bearing maintenance and replacements with our advanced design. Our permanent magnet motor, crafted without bearings, guarantees a maintenance-free experience, optimizing your operational uptime.
3) Advanced Integrated Frequency Converter:Featuring China's foremost frequency system, our unit offers unparalleled speed regulation and precision. Seamlessly adapting to actual gas demands, it delivers outstanding energy savings and performance efficiency.
4) Zero Transmission Loss:Achieve perfect transmission efficiency with our innovative integrated shaft connection. The direct drive design eradicates couplings and other transmission components, ensuring zero transmission loss for maximum operational efficiency.
5) Variable and Soft Start MechanismsProtect your power grid and equipment with our sophisticated variable frequency start and soft start capabilities. These mechanisms minimize impact and prevent potential damage, ensuring long-term reliability.
6) Enhanced Energy Conservation:Our unit boasts a frequency conversion range of 25% to 100%, significantly outperforming the typical 50%-100% range. This results in over 30% energy savings compared to fixed-speed compressors, particularly benefiting systems with fluctuating gas consumption.
7) Unique Two-Stage Compression Air End:Experience superior compression efficiency with our groundbreaking two-stage compression screw design. Integrating first and second-stage rotors within a single casing, and driven by gears, it achieves optimal linear speeds, substantially boosting overall efficiency.
8) Innovative Internal Spray Curtain Cooling:Our pioneering internal spray curtain cooling system dramatically lowers compressed air temperature, achieving near-isothermal compression. This method reduces pressure loss and enhances overall compression efficiency, contributing to substantial energy savings.
9) Minimized Internal Leakage:By employing a two-stage compression approach, we effectively reduce the compression ratio for each stage, thereby minimizing internal leakage and significantly improving volumetric efficiency.
10) Superior Noise Reduction:Our two-stage compression not only lowers the compression ratio but also significantly reduces noise levels, especially during unloading. This ensures a quieter, more pleasant operational environment.
11) Effortless Maintenance and Service:Maintenance and service are remarkably straightforward. Apart from the advanced screw air end, our two-stage compressor's systems and structures mirror those of single-stage units, ensuring ease of maintenance and user-friendly operation.
12) Door panels are removable:The unit's metal casing, treated for noise reduction and equipped with high-density sound-absorbing material, ensures noise levels meet international standards. The door panels can be opened and removed, offering a 270-degree all-round space for easy maintenance access.
1. Unbeatable Price Advantage
We present our clients with highly competitive ex-factory prices, ensuring you maintain a significant edge in the marketplace.
2. Direct Transactions
Our products are delivered directly from our factory, allowing us to provide you with the most cost-effective solutions available.
3. Comprehensive OEM & ODM Services
Leveraging our extensive production and management capabilities, we proficiently meet your OEM and ODM service requirements without a hitch.
4. Tailored Customization
We embrace non-standard, export, and customized voltage/power/pressure orders. Connect with us to discuss your unique specifications, and we will meet your needs to perfection.
5. Small Order Acceptance
Initiate with a small trial order to experience the exceptional quality of our offerings firsthand.
6. Rapid Delivery
We guarantee prompt and timely delivery of our superior products, ensuring the seamless continuity of your operations.
7. Comprehensive Authorization
For our valued distributors, we provide complete authorization certification, empowering you to market and sell our esteemed SANZHI brand products with confidence.
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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