Internal Structure - Frontside
Internal Structure - Backside
Working Principle
In an ideal air compression scenario, the power needed for single-stage pressure transmission equals the sum required for multi-stage compression. However, in practical applications, actual operational power increases due to inefficiencies like power loss from coupling, bearing friction, and the cooling effects of liquid viscosity. By minimizing the compression ratio at each stage, the total power for multi-stage compression can be reduced compared to single-stage compression, effectively diminishing these inefficiencies.
The two-stage screw air compressor features a dual-stage rotary screw mechanism. Each stage contains an active and a passive screw, with the active screw driving the passive one via an external power transmission device. The first stage uses a low-pressure screw group, while the second stage employs a high-pressure screw group. Each screw rotates within an air-tight seal. During rotation, the gas undergoes three stages of compression: suction, pressurization, and exhaust.
First Stage Compression: The initial stage utilizes a low-pressure screw group to compress the gas. Gas enters the compression chamber through the suction valve. Under the high-speed rotation of the screw rotor, the gas is progressively compressed and then transferred to the second stage.
Second Stage Compression: At this stage, the gas moves into a more confined screw space where it is compressed at higher temperatures and pressures. The exhaust valve opens to release the high-pressure gas from the system.
Natural air is filtered before entering the first stage of compression, where it mixes with a small amount of lubricating oil in the compression chamber. This mixture is compressed to interstage pressure. The compressed gas passes through a cooling channel and contacts a significant amount of oil mist, lowering its temperature. The cooled gas enters the second-stage rotor for further compression and is ultimately expelled through the exhaust valve, completing the entire compression process.
Water-cooled compressors utilize the remarkable cooling power of water to enhance performance. As the cooling water circulates through the air compressor, it effectively cleans internal components, boosts lubrication, and extends the lifespan of friction-wearing parts. During operation, this water efficiently dissipates heat from the cylinder and compressed gas, significantly reducing exhaust temperature and power consumption, thereby minimizing operational costs. However, users must be vigilant about potential scaling issues within the water cooling system.
1) Superior Efficiency of PM Motor:Our state-of-the-art permanent magnet motor boasts a wider constant torque and weak magnetic range, offering 20-30% higher efficiency compared to traditional motors. Even when operating away from the rated frequency, it maintains consistent efficiency, ensuring extraordinary motor performance.
2) Maintenance-Free Motor:Engineered without internal bearings, our permanent magnet motor eliminates the need for costly maintenance and bearing replacements, providing hassle-free operation.
3) Integrated Frequency Converter:Equipped with China's leading frequency system, this unit offers an extensive speed regulation range and high precision. It adjusts to the user's actual gas demand, providing remarkable energy-saving benefits for the air compressor.
4) Zero Transmission Loss:With an integrated shaft structure connecting the permanent magnet motor and compressor directly, this design eliminates couplings and other transmission parts, achieving a perfect 100% transmission efficiency.
5) Variable Frequency and Soft Start:Our motor supports variable frequency start and soft start, significantly reducing impact on power grid equipment and preventing damage to electrical components.
6) Enhanced Energy Efficiency:Featuring a frequency conversion range from 25% to 100% (compared to the ordinary 50% to 100%), this system offers over 30% energy savings versus fixed-speed compressors and approximately 5% more energy savings compared to standard variable frequency compressors. Greater fluctuations in system gas consumption amplify these energy-saving effects.
7) Unique Two-Stage Compression Air End:Our two-stage compression screw machine features a uniquely designed air end, integrating both first-stage and second-stage compression rotors within a single casing. By rotating through gears, it achieves optimal linear speed for each stage, enhancing compression efficiency.
8) Innovative Internal Spray Curtain Cooling:Our advanced internal spray curtain cooling method delivers superior cooling performance, significantly lowering the temperature of compressed air to approach isothermal compression, and reduces pressure loss between stages to improve overall compression efficiency.
9) Minimized Internal Leakage:By adopting two-stage compression, we lower the compression ratio of each stage, reducing internal leakage from high-pressure to low-pressure ends and thereby enhancing volumetric efficiency.
10) Noise Reduction:The two-stage compression mechanism lowers the compression ratio, dramatically reducing operational noise, particularly during unloading phases.
11) Simplified Maintenance and Service:Aside from the screw air end, our two-stage compressor unit retains similar systems and structures to single-stage compressors, ensuring ease of maintenance and user convenience.
Packaging & Shipping
Our Advantages
1. Unmatched Price Advantage
We offer direct ex-factory pricing, empowering our customers with a competitive edge.
2. Direct Deal Benefits
Our products are supplied directly from the factory, ensuring you receive the most cost-effective solutions.
3. Comprehensive OEM & ODM Services
Our robust production and management capabilities enable us to provide exceptional OEM/ODM services tailored to your needs.
4. Bespoke Customisation Services
We accept non-standard and export orders, and can customize voltage, power, pressure, etc. Reach out to us with your specific requirements.
5. Small Order Acceptance
Test the excellence of our products by placing a small trial order first.
6. Expedited Delivery
Experience the combination of high-quality products and prompt delivery.
7. Comprehensive Authorization
For our distributors, we provide full authorization certificates, empowering you to sell our SANZHI brand products with confidence.
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About us
Sanzhi (Henan) Compressor Co., Ltd is a premier manufacturer excelling in the production of screw air compressors and screw vacuum pumps, boasting over a decade of industry experience. Our diverse product portfolio features state-of-the-art screw air compressors and vacuum pumps including normal pressure/low-pressure screw air compressors, permanent magnet frequency conversion models, two-stage compression units, screw air compressors for laser cutting, single-tank and double-tank mobile screw air compressors, electric and diesel mobile screw air compressors, and advanced screw vacuum pumps.
In production, our cutting-edge assembly lines facilitate the most efficient manufacturing processes. Thanks to our dedicated team of over 50 employees, we continuously optimize management systems such as ERP to minimize lead times and ensure the swift delivery of high-quality products.
In management, our factory proudly holds ISO9001 quality management system certification. We adhere to stringent quality standards, implementing rigorous quality control processes. Every machine undergoes comprehensive inspections, including material checks, production assessments, and pre-delivery evaluations, ensuring only the finest products leave our facility.
In customer service, we excel in pre-sales consultation, offering professional guidance to help customers select the ideal air equipment tailored to their specific needs. Our high level of customization extends to both appearance and configuration, and we provide OEM services to meet unique dealer demands. For after-sales support, our professional sales and service team ensures prompt and efficient customer responses.
At Sanzhi (Henan) Compressor Co., Ltd, we are committed to delivering superior, stable products and fostering long-term customer relationships. With efficient delivery, top-quality machines, and competitive pricing, we are your reliable partner for comprehensive compressed air solutions.
Our factory is conveniently located in Xinzheng City, Henan Province, China. We offer complimentary pick-up services from Xinzheng International Airport, located just 30 kilometers away-about an hour's drive. We warmly welcome your visit to our company!
FAQ
Q1. Are you a trading company or manufacturer?
A: We are a seasoned manufacturer specializing in screw air compressors, backed by over 10 years of expertise.
Q2. How do you control quality?
A: 1. We rigorously inspect all raw materials.
2. Installation procedures are meticulously controlled.
3. Each machine undergoes a minimum of 5 hours of continuous testing before leaving our factory to ensure optimal performance.
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 for your country (V/Hz)
4. Additional accessories needed (e.g., air tanks, filters, air dryers).
Provide these details, and we will design 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 air compressors are available in various voltages including 380v/50hz/3p, 400v/50hz/3p, 415v/50hz/3p, 220v/60hz/3p, 440v/60hz/3p, and can be customized to meet your specific requirements.
Q6. How long is the delivery time?
A: For standard voltage, your order will be processed within a swift 15 working days after confirmation. For non-standard specifications, kindly reach out to our sales team for detailed timelines.
Q7. What's the payment term?
A: We require 30% T/T upfront, another 40% T/T before shipment, and the final 30% T/T upon receipt of the B/L copy. Payments can be made in both USD and RMB.
Q8. How about your warranty?
A: We offer a comprehensive one-year warranty for the entire machine and an extended two-year warranty specifically for the screw air compressor, excluding consumable spare parts.
Q9. What about the maintenance?
A: The initial maintenance should be conducted after 500 hours of operation. Subsequent maintenance is required every 2000-3000 hours, adjusted according to the actual working environment.
Q10. Can machines be run in high-temperature environment?
A: Absolutely, our machines are designed to operate efficiently in high-temperature environments, with a working temperature range from -20°C to 45°C (-4°F to 113°F).
Q11. Do you offer OEM service?
A: Yes, we proudly offer OEM and ODM services, facilitated by our professional design team. Your custom orders are highly welcome.
Q12. How long could your air compressor be used?
A: Typically, our air compressors have a lifespan exceeding 10 years.
Q13. Will you provide some spare parts for the machines?
A: Certainly, we will provide spare parts for your machines.
Q14. How about your after-sales service?
A: We offer comprehensive after-sales support, including online instructions for installation and commissioning. Additionally, our engineers are available for training and installation assistance.
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