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 sum needed for multi-stage compression. However, in real-world applications, various inefficiencies such as coupling transmission power loss, bearing friction, and liquid viscosity cooling effects cause the actual working power to increase. By reducing the compression ratio at each stage, multi-stage compression can require less total power than single-stage compression, effectively minimizing these losses.
The two-stage screw air compressor boasts a two-stage rotary screw mechanism. Each stage features an active and a passive screw, with the active screw driving the passive screw via an external power 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 in a sealing air film. As they rotate, the gas is compressed through three stages: suction, pressurization, and exhaust.
First Stage Compression: The initial stage utilizes a low-pressure rate screw group that compresses the gas between them. Gas enters the screw compression chamber via the suction valve. Under the high-speed rotation of the screw rotor, the gas is progressively squeezed out and transferred to the second stage.
Second Stage Compression: In the second stage, the gas moves into a more confined screw space, where it is compressed at higher temperatures and pressures. The exhaust valve then opens, expelling high-pressure gases from the system.
Before entering the first stage of compression, natural air is filtered and mixed with a small amount of lubricating oil in the compression chamber. This mixture is compressed to the interstage pressure. The compressed gas then passes through a cooling channel, where it encounters a large amount of oil mist, significantly lowering its temperature. The cooled gas enters the second-stage rotor, undergoes further compression, and is ultimately expelled through the exhaust valve, completing the entire compression process.
Water-cooled compressors expertly utilize water as a cooling medium, enhancing performance and longevity. The circulating cooling water not only ensures superior lubrication by cleaning internal components but also extends the lifespan of friction-wearing parts. During operation, it effectively dissipates heat from the cylinder and compressed gas, significantly lowering exhaust temperatures and power usage, leading to reduced operational costs. However, attention must be given to 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 range and a superior weak magnetic range. Its efficiency is 20-30% higher than traditional motors. Remarkably, it maintains consistent efficiency even when operating away from the rated frequency, ensuring unmatched motor performance.
2) Maintenance-Free Motor:Designed without internal bearings, our permanent magnet motor eliminates the need for costly maintenance and bearing replacements, ensuring continuous, 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 adapts to the user's actual gas demand, delivering impressive energy savings for the air compressor.
4) Zero Transmission Loss:Featuring an integrated shaft structure, the permanent magnet motor and compressor are directly connected without couplings or other transmission parts, achieving 100% transmission efficiency.
5) Variable Frequency and Soft Start:The motor's variable frequency and soft start capabilities significantly reduce the impact on power grid equipment, preventing damage to electrical components and ensuring smooth operation.
6) Enhanced Energy Efficiency:With a frequency conversion range from 25% to 100% (compared to the ordinary 50% to 100%), our system offers over 30% energy savings compared to fixed-speed compressors and about 5% more energy savings than standard variable frequency compressors. Larger fluctuations in system gas consumption enhance these energy-saving effects.
7) Unique Two-Stage Compression Air End:Our two-stage compression screw machine features a uniquely designed air end, integrating first-stage and second-stage compression rotors within a single casing. These rotors are rotated through gears to achieve optimal linear speed for each stage, enhancing overall compression efficiency.
8) Innovative Internal Spray Curtain Cooling:Our advanced internal spray curtain cooling method provides superior cooling performance, significantly lowering the temperature of compressed air. This method approximates isothermal compression and reduces pressure loss between stages for improved 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, thereby enhancing volumetric efficiency.
10) Noise Reduction:Our two-stage compression mechanisms lower the compression ratio, dramatically reducing operational noise, especially during unloading, ensuring quieter operations.
11) Simplified Maintenance and Service:The two-stage compressor unit maintains similar systems and structures to single-stage compressors, apart from the screw air end. This design ensures ease of maintenance and user convenience, simplifying service requirements.
1. Unbeatable Price Edge
We deliver direct ex-factory pricing, giving our customers a significant competitive advantage.
2. Direct Supply Benefits
Our products come directly from the factory, ensuring you receive the most cost-effective solutions available.
3. Comprehensive OEM & ODM Expertise
With robust production and management capabilities, we offer exceptional OEM/ODM services tailored precisely to your needs.
4. Tailored Customisation Services
We accept non-standard and export orders, customizing voltage, power, pressure, and more. Contact us with your specific requirements.
5. Acceptance of Small Orders
Test the superior quality of our products by placing a small trial order first.
6. Swift Delivery
Experience the perfect blend of high-quality products and expedited delivery services.
7. Comprehensive Distributor Authorization
We provide full authorization certificates to our distributors, enabling you to sell SANZHI brand products with absolute confidence.
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 with remarkable efficiency, within just 15 working days after confirmation. For non-standard specifications, please don't hesitate to reach out to our dedicated sales team for detailed timelines.
Q7. What's the payment term?
A: We require an initial 30% T/T payment upfront, followed by another 40% T/T payment before shipment, and the final 30% T/T payment upon receipt of the B/L copy. We accept payments in both USD and RMB.
Q8. How about your warranty?
A: We provide a comprehensive one-year warranty for the entire machine, along with 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 performed after 500 hours of operation. Subsequent maintenance is required 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 an impressive 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 expert design team. Your custom orders are highly welcome.
Q12. How long could your air compressor be used?
A: Typically, our air compressors boast a lifespan exceeding 10 years.
Q13. Will you provide some spare parts for the machines?
A: Certainly, we will provide essential spare parts for your machines.
Q14. How about your after-sales service?
A: We provide comprehensive after-sales support, including online instructions for installation and commissioning. Additionally, our skilled engineers are available for training and installation assistance.
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