Internal Structure Frontside
Internal Structure Backside
Working Principle
In an ideal air compression scenario, the energy needed for single-stage pressure transmission equals the cumulative energy required for multiple stages. However, real-world compression diverges due to power losses from coupling transmission, bearing friction, liquid viscosity's cooling effects, and other factors. By minimizing each stage's compression ratio, the total energy needed for multi-stage compression can be less than that for single-stage compression, effectively reducing wasted power.
The two-stage screw air compressor consists of a dual-stage rotary screw system, with each stage featuring an active and a passive screw. The active screw drives the passive screw through an external power transmission system. The first stage operates with a low-pressure screw group, while the second stage uses a high-pressure screw group. A sealing air film encircles each screw, facilitating compression through suction, pressurization, and exhaust processes.
First Stage Compression: In the initial stage, a low-pressure screw group compresses the gas, which enters the chamber via the suction valve. The screw rotor's high-speed rotation gradually compresses the gas, transferring it to the second stage.
Second Stage Compression: During the second stage, the gas enters a more compact screw space for higher temperature and pressure compression. The exhaust valve then opens to expel the high-pressure gas from the system.
Natural air is drawn into the first compression stage through an air filter, mixing with a small amount of lubricating oil. The mixed gas is compressed to interstage pressure, then cooled significantly by oil mist in the cooling channel. The cooled gas moves to the second-stage rotor for final compression, reaching the exhaust pressure. The entire process culminates when the compressed air is discharged through the exhaust valve.
Water-cooled compressors utilize water as the cooling medium. As cooling water circulates within the air compressor, it not only aids in cleaning but also enhances lubrication, thus extending the lifespan of friction-wearing parts. During operation, the cooling water absorbs heat from the cylinder and compressed gas, significantly lowering exhaust temperature and power consumption, which in turn reduces operating costs. Attention must be given to potential scaling issues within the water cooling system.
1) Exceptional PM Motor Efficiency: With an extensive constant torque range and weak magnetic range, the permanent magnet motor outperforms regular motors by 20-30%. Even when operating away from rated frequency, it maintains consistent, high efficiency.
2) Maintenance-Free Motor:The absence of internal bearings in the permanent magnet motor eliminates the need for motor bearing maintenance and replacement.
3) Integrated Frequency Converter:Equipped with China's top-tier frequency system, it offers a wide speed regulation range and high precision. The frequency modulation operation aligns with the user's actual gas demand, resulting in remarkable energy-saving effects.
4) Zero Transmission Loss:The direct connection of the permanent magnet motor and compressor via an embedded integrated shaft ensures a compact structure, with no coupling or other transmission parts, achieving 100% transmission efficiency.
5) Variable Frequency Start and Soft StartThe variable frequency start and soft start of the motor significantly reduce the impact on power grid equipment, preventing damage to electrical equipment.
6) Reduced Energy Consumption:With a frequency conversion range from 25% to 100% (compared to ordinary frequency conversion from 50% to 100%), this system saves over 30% more energy than fixed-speed air compressors. Even compared to standard variable frequency air compressors, it offers around 5% energy savings. The greater the fluctuation in system gas consumption, the more pronounced the energy-saving effect.
7) Unique Two-Stage Compression Air End:The two-stage compression screw machine features a distinct air end design, combining the first and second stage compression rotors within a single casing. Rotated directly via gears, each rotor achieves optimal linear speed, resulting in higher compression efficiency.
8) Internal Spray Curtain Cooling Method:This high energy-saving method provides excellent cooling, significantly lowering the temperature of compressed air and achieving near-isothermal compression. It also reduces pressure loss between the first and second stages, lowers the compression ratio, and enhances compression efficiency.
9) Minimized Internal Leakage:Two-stage compression lowers the compression ratio for each stage, reducing internal leakage from high to low-pressure ends, and improving volumetric efficiency.
10) Noise Reduction:The reduced compression ratio in two-stage compression significantly cuts down noise, particularly unloading noise.
11) Simplified Maintenance and Service:Besides the screw air end, the two-stage compressor unit's other systems and structures are similar to single-stage compression, facilitating easy maintenance and user convenience.
1. Unmatched Price Advantage
We provide our customers with competitive, factory-direct pricing, ensuring you stay ahead of the competition.
2. Direct Factory Deals
All our products come straight from the factory, offering you more cost-effective solutions.
3. Comprehensive OEM & ODM Services
Our robust production and management capabilities enable us to offer exceptional OEM/ODM services tailored to your needs.
4. Personalized Customization Services
We cater to non-standard and export orders, customizing parameters like voltage, power, and pressure to meet your unique specifications. Reach out for tailored solutions.
5. Small Order Acceptance
Feel free to place a small trial order to assess our product quality firsthand.
6. Swift Delivery
Experience the combination of high-quality products with prompt, reliable delivery.
7. Comprehensive Authorization
For our distributors, we provide full authorization certificates, empowering you to sell our esteemed SANZHI brand products with confidence.
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Company Profile
Sanzhi (Henan) Compressor Co., Ltd. excels with over a decade of distinguished expertise, firmly establishing itself as a leading manufacturer of screw air compressors and screw vacuum pumps. Our comprehensive and versatile product lineup includes an array of normal pressure and low-pressure screw air compressors, advanced permanent magnet frequency conversion screw air compressors, highly efficient two-stage compression screw air compressors, specialized screw air compressors for laser cutting, both single-tank and double-tank mobile screw air compressors, robust electric and diesel mobile screw air compressors, and the powerful screw vacuum pump, among others.
Our cutting-edge production lines, meticulously designed to accommodate multiple air compressor assemblies, ensure optimal efficiency and modernity. With the unwavering dedication of our 50+ skilled employees, we perpetually enhance our management systems, including ERP, to significantly reduce lead times and ensure swift delivery of top-notch products.
Demonstrating our unwavering commitment to excellence, our factory proudly holds the ISO9001 quality management system certification. We strictly adhere to rigorous quality control standards, ensuring every machine undergoes thorough inspections at each stage-from material inspection to production, and ultimately to pre-delivery examination.
Our unparalleled customer service provides comprehensive pre-sales guidance to assist customers in selecting the ideal air equipment tailored to their diverse needs. We excel in high customization, from aesthetic design to technical allocation, and offer bespoke OEM solutions to meet specific dealer demands. Our dedicated sales & service team ensures swift, professional after-sales support.
At Sanzhi (Henan) Compressor Co., Ltd., we are committed to delivering superior, reliable, and stable products, fostering enduring relationships with our valued customers. With our promise of efficient delivery, premium machines, and competitive pricing, we provide a trustworthy and satisfactory compressed air solution.
Conveniently located in Xinzheng City, Henan Province, China, our factory is a short distance from Xinzheng International Airport, approximately 30 kilometers away. We warmly welcome you to visit and witness our dedication to excellence firsthand.
FAQ
Q1. Are you a trading company or manufacturer?
A: We are a professional manufacturer specializing in screw air compressors with over a decade of expertise.
Q2. How do you control quality?
A: 1. We meticulously inspect all raw materials.
2. We implement stringent control over installation procedures.
3. Each machine undergoes a rigorous minimum of 5 hours of continuous testing before it leaves our factory.
Q3. What information must I provide to get the suitable machine?
1. Required air delivery capacity (Unit: CFM or m³/Min)
2. Desired working pressure (Unit: PSI, Bar or Mpa)
3. Voltage and frequency specifications in your country (V/Hz)
4. Any additional accessories you might need, such as an air tank, filters, and/or air dryers.
Share this information with us, and we will craft a tailored 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's air compressors support voltages including 380v/50hz/3p, 400v/50hz/3p, 415v/50hz/3p, 220v/60hz/3p, 440v/60hz/3p, and can be customized to your specific requirements.
Q6. How long is the delivery time?
A: For our standard voltage units, expect a swift delivery within 15 working days post-order confirmation. If you require non-standard units, kindly reach out to our dedicated sales team for personalized assistance.
Q7. What's the payment term?
A: Our payment terms are structured as follows: 30% T/T in advance, 40% T/T before shipment, and the remaining 30% T/T 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 stand by the quality of our products with a robust warranty policy: a one-year warranty for the entire machine and an extended two-year warranty for the screw air compressor itself, excluding consumable spare parts.
Q9. What about the maintenance?
A: The first maintenance check is essential after 500 hours of operation. Subsequent maintenance should be conducted every 2000-3000 hours, tailored to the specific operating environment to ensure optimal performance.
Q10. Can machines be run in high-temperature environments?
A: Absolutely. Our advanced machines are engineered to thrive in high-temperature environments, with a robust working temperature range spanning from -20° to 45° (-4ºF to 113ºF).
Q11. Do you offer OEM service?
A: Certainly. Our experienced design team is enthusiastic about accommodating both OEM and ODM orders to meet your specific requirements.
Q12. How long could your air compressor be used?
A: Our air compressors are built for longevity, often delivering reliable performance for over 10 years.
Q13. Will you provide some spare parts for the machines?
A: Yes, we are committed to supporting our customers with a full range of spare parts for our machines.
Q14. How about your after-sales service?
A: We provide comprehensive after-sales service, including online guidance for installation and commissioning. Additionally, we can arrange for our expert engineers to assist with on-site training and installation, ensuring a seamless experience.
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