Experience the pinnacle of industrial performance with the Large Power Oil Lubricated Screw-Compressor, exclusively from Sanzhi (Henan) Compressor Co., Ltd. As a vanguard in the Chinese compressor industry, we are delighted to present our Factory Price Permanent Magnet Variable Frequency Two-Stage Screw Air Compressors. These units are meticulously engineered with premier Industrial Centrifugal Fans to ensure superior functionality. Our compressors stand out for their Energy-Saving and High-Efficiency features, designed in a durable Stationary Type format. Trust in Sanzhi for all your industrial needs and witness unparalleled excellence in every aspect.
Internal Structure Frontside
Internal Structure Backside
Working Principle
In an ideal air compression process, the power required for single-stage pressure transmission is equivalent to the combined power needed for multi-stage compression. However, in real-world applications, the actual working power increases due to factors like coupling transmission power loss, bearing friction, and the cooling effect of liquid viscosity. To counteract these inefficiencies, reducing the compression ratio at each stage can significantly decrease the total power needed for multi-stage compression, making this method more efficient than single-stage compression.
The two-stage screw air compressor boasts an advanced two-stage rotary screw mechanism, with each stage featuring an active and a passive screw. The active screw propels the passive screw via an external transmission device. The first stage employs a low-pressure rate screw group, while the second stage utilizes a high-pressure rate screw group. Each screw is enveloped by a sealing air film. As the screws rotate, gas undergoes compression through three phases: suction, pressurization, and exhaust.
First Stage Compression: The initial phase of the two-stage screw air compressor involves a low-pressure rate screw group. Gas is drawn into the screw compression chamber via the suction valve, where it is incrementally compressed by the high-speed rotation of the screw rotor before being transferred to the second stage.
Second Stage Compression: During the second phase, the gas enters a more confined screw space and is subjected to higher pressures and temperatures. The exhaust valve then opens, releasing the high-pressure gases from the system.
Natural air is initially drawn into the compressor through the air filter and mixed with a small quantity of lubricating oil in the compression chamber. This mixture is compressed to interstage pressure. The compressed gas then flows through the cooling channel, encountering a significant amount of oil mist, which drastically reduces its temperature. The cooled, compressed gas enters the second-stage rotor for further compression to the final exhaust pressure. The entire process culminates with the gas being discharged through the exhaust valve.
| 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. |
The centrifugal fan features an advanced high-speed rotating impeller that optimizes airflow acceleration and deceleration. With axial air intake, it significantly enhances motor cooling compared to traditional air-cooled fans. This cutting-edge design guarantees continuous compressor operation and substantially extends its lifespan.
1) High Efficiency of *** Motor:The permanent magnet (***) motor shines with an expansive constant torque range and weak magnetic range. It delivers 20-30% higher efficiency than conventional motors. Remarkably, the *** motor retains its exceptional efficiency even when operating outside its rated frequency, ensuring consistent top-tier performance.
2) Maintenance-Free Motor:Designed without internal bearings, the *** motor eliminates the need for expensive bearing maintenance and replacement, ensuring seamless performance.
3) Integrated Frequency Converter:Utilizing China's premier frequency system, this unit provides precise extensive speed regulation. It dynamically adjusts operation based on real-time gas demands, delivering outstanding energy-saving performance.
4) Zero Transmission Loss:The *** motor and compressor boast a direct integrated shaft connection for a more compact design. By removing couplings and other transmission parts, it ensures 100% transmission efficiency.
5) Variable Frequency and Soft Start:This feature minimizes the impact on power grid equipment, safeguarding electrical systems from potential harm.
6) Reduced Energy Consumption:Featuring a frequency conversion range of 25% to 100% (compared to the standard 50% to 100%), this compressor achieves over 30% energy savings versus fixed-speed models and approximately 5% more than typical variable frequency compressors. Greater system gas consumption fluctuations result in more significant energy savings.
7) Unique Two-Stage Compression Air End:This pioneering design integrates first and second stage compression rotors within a single case, driven by gears for optimal speed, significantly enhancing compression efficiency.
8) Internal Spray Curtain Cooling Method:Our high-efficiency internal spray curtain cooling drastically reduces compressed air temperatures. Achieving near-isothermal compression, it minimizes pressure loss and compression ratios, thereby enhancing overall efficiency.
9) Minimized Internal Leakage:The two-stage compression technique reduces each stage's compression ratio, decreasing internal leakage from high to low pressure ends and thus enhancing volumetric efficiency.
10) Noise Reduction:The dual-stage compression design significantly lowers the compression ratio, resulting in a notable reduction in both operational and unloading noise levels.
11) Easy Maintenance and Service:Aside from the screw air end, the two-stage compressor unit shares similar structures and systems with single-stage units, making maintenance and service straightforward and user-friendly.
1. Unbeatable Price Advantage
We offer direct ex-factory prices that empower our clients to remain highly competitive in their respective markets, thereby maximizing profitability and expanding market share.
2. Seamless Direct Deal
Our products are delivered straight from the factory to you, enabling us to provide exceptionally cost-effective solutions by eliminating intermediary markups.
3. Premium OEM & ODM Services
Our state-of-the-art production and management capabilities empower us to deliver superior OEM and ODM services, meticulously tailored to meet your precise specifications and business needs.
4. Tailored Customization Services
We specialize in non-standard and export orders, customizing voltage, power, pressure, and more to fit your specific requirements. Contact us to discuss bespoke solutions.
5. Small Order Flexibility
Begin with a small trial order to experience the unparalleled quality of our products and witness the remarkable difference firsthand.
6. Rapid and Reliable Delivery
We ensure that our premium-quality products are delivered to you swiftly and efficiently, guaranteeing uninterrupted operations.
7. Comprehensive Authorization
For our distributors, we provide complete authorization certificates, equipping you to sell SANZHI brand products with absolute confidence and full support.
Sanzhi (Henan) Compressor Co., Ltd. stands as an eminent leader in the realm of screw air compressors and screw vacuum pumps. With over a decade of profound industry expertise, we proudly present a comprehensive suite of products including: normal pressure/low-pressure screw air compressors, permanent magnet frequency conversion screw air compressors, two-stage compression screw air compressors, specialized screw air compressors for laser cutting, single-tank and double-tank mobile screw air compressors, electric and diesel mobile screw air compressors, and superior screw vacuum pumps. Our portfolio meets the diverse needs of various industrial applications.
Our streamlined production operations epitomize efficiency and modernity, utilizing lean, multi-air compressor assembly lines. Empowered by a dedicated workforce of over 50 skilled professionals, we relentlessly refine our management systems-such as ERP-to minimize lead times and ensure the rapid delivery of top-tier products. Our advanced production capabilities underscore our commitment to excellence.
Our unwavering commitment to excellence is validated by our ISO9001 quality management system certification. By adhering to the most stringent quality management protocols and standardized control processes, we ensure that each machine undergoes exhaustive material, production, and pre-delivery inspections. This guarantees the impeccable quality that our customers have come to expect from Sanzhi.
We pride ourselves on delivering exceptional customer service, beginning with expert guidance during the pre-sales phase to help clients choose the ideal air equipment. We offer highly customized solutions, including unique OEM products tailored to specific dealer requirements. Post-sales, our professional sales and service team ensures prompt and effective responses to customer inquiries, maintaining the highest levels of customer satisfaction.
At Sanzhi (Henan) Compressor Co., Ltd., our pledge is to deliver superior and reliable products, fostering enduring relationships with our clientele. With efficient delivery, premium quality machines, and competitive pricing, we aim to provide unparalleled compressed air solutions that cater to the evolving needs of our customers.
Our factory is strategically located in Xinzheng City, Henan Province, China, and offers hassle-free pick-up services from Xinzheng International Airport. The factory is approximately 30 kilometers away, translating to a convenient one-hour journey. We warmly welcome you to visit our company and witness our advanced operations firsthand. Experience the Sanzhi difference!
FAQ
Q1. Are you a trading company or manufacturer?
A: We are a dedicated manufacturer of screw air compressors with over 10 years 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 standard voltage requirements, our lead time is 15 working days post-confirmation. For non-standard voltage requests, we recommend contacting our sales team to obtain precise timelines tailored to your needs.
Q7. What's the payment term?
A: We require a structured payment plan of 30% T/T in advance, 40% T/T prior to shipment, and the remaining 30% T/T upon receipt of the B/L copy. Payments can be made in both USD and RMB currencies.
Q8. How about your warranty?
A: Our warranty offers comprehensive coverage for one year on the entire machine and two years on the screw air compressor, excluding consumable spare parts.
Q9. What about the maintenance?
A: The initial maintenance should be conducted after 500 operating hours. Subsequent 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 engineered to operate efficiently in high-temperature environments, with a working temperature range from -20° to 45°C (-4°F to 113°F).
Q11. Do you offer OEM service?
A: Indeed, we provide both OEM and ODM services, supported by our professional design team, ensuring high adaptability to your specific requirements.
Q12. How long could your air compressor be used?
A: Our air compressors boast a robust lifespan, typically lasting over 10 years with proper maintenance.
Q13. Will you provide some spare parts for the machines?
A: Yes, we will definitely provide essential spare parts for the machines to ensure their longevity and performance.
Q14. How about your after-sales service?
A: We offer an all-inclusive after-sales service package that includes online guidance for installation and commissioning. Additionally, we can arrange for our engineers to provide on-site training and installation support.
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