Internal Structure Frontside
Internal Structure Backside
Working Principle
In an ideal air compression process, the power required for single-stage pressure transmission equals the sum needed for multi-stage compression. However, in reality, the actual working power increases due to transmission power loss from coupling, bearing friction, cooling effects of liquid viscosity, and other factors. Therefore, by reducing the compression ratio of each stage, we can minimize useless power, ensuring that the total power required for multi-stage compression is less than that for single-stage compression.
The two-stage screw air compressor features a two-stage rotary screw compressor system. Each stage includes an active and a passive screw. The active screw drives the passive screw via an external power transmission device. The first stage employs a low-pressure rate screw group, while the second stage uses a high-pressure rate screw group. A sealing air film surrounds each screw, and as they rotate, the gas is compressed through three processes: suction, pressurization, and exhaust.
First Stage Compression: The two-stage screw air compressor's first stage utilizes a low-pressure rate screw group, where gas is squeezed between screws. The gas enters the screw compression chamber via the suction valve. Under the high-speed rotation of the screw rotor, the gas is gradually squeezed out and transferred to the second stage.
Second Stage Compression: In the second stage screw group, the gas enters a tighter screw space and is compressed at higher temperature and pressure. The exhaust valve opens to release the high-pressure gases from the system.
Natural air is drawn into the first compression stage through an air filter, mixing with a small amount of lubricating oil in the compression chamber. The mixed gas is compressed to the interstage pressure, then cooled by contacting a large amount of oil mist in the cooling channel. The cooled compressed gas moves to the second-stage rotor, undergoes two-stage compression to reach the final exhaust pressure, and is discharged through the exhaust valve, completing the entire compression process.
Our water-cooled compressors utilize water as the essential cooling medium. As the cooling water circulates through the compressor, it not only cleans but also enhances lubrication, significantly extending the lifespan of friction-wearing parts. During operation, the cooling water dissipates heat from the cylinder and compressed gas, effectively lowering the exhaust temperature and power consumption. This reduction in operational costs is notable. However, attention must be given to potential scaling issues within the water cooling system.
1) High Efficiency of PM Motor:Our permanent magnet (PM) motor boasts a broad constant torque and weak magnetic range. Impressively, it operates with 20-30% higher efficiency compared to regular motors. Even when functioning away from its rated frequency, the PM motor maintains an exceptionally high level of efficiency.
2) Motor Maintenance-Free:The PM motor's design is free of internal bearings, thus eliminating any costs associated with motor bearing maintenance and replacement.
3) Integrated Frequency Converter:Leveraging China's top frequency system, our compressors offer extensive speed regulation and high precision. They adapt to actual gas demand through frequency modulation, delivering remarkable energy-saving performance.
4) No Transmission Loss:The embedded integrated shaft directly connects the PM motor and compressor, creating a more compact structure. With no couplings or other transmission components, the transmission efficiency reaches 100%.
5) Variable Frequency Start and Soft Startof the motor significantly diminish impact on power grid equipment, ensuring no damage occurs to electrical components.
6) Reduced Energy Consumption:Our frequency conversion ranges from 25% to 100% (compared to the standard 50% to 100%). This results in over 30% energy savings versus fixed-speed compressors, and about 5% savings compared to regular variable-frequency compressors. The greater the fluctuation in system gas consumption, the more pronounced the energy savings.
7) Unique Two-Stage Compression Air End:The innovative design of our two-stage compression screw machine integrates the first and second compression rotors within a single casing. Each rotor achieves optimal linear speed through direct gear rotation, leading to higher compression efficiency.
8) Internal Spray Curtain Cooling Method:Utilizing a high energy-saving internal spray curtain cooling technique, this method significantly lowers the temperature of the compressed air. It achieves near-isothermal compression, reduces pressure loss between stages, lowers the compression ratio, and enhances overall compression efficiency.
9) Reduced Internal Leakage:Adopting two-stage compression lowers the compression ratio for each stage, minimizing internal leakage from the high-pressure to the low-pressure end, thereby improving volumetric efficiency.
10) Noise Reduction:Two-stage compression not only decreases the compression ratio but also significantly reduces noise, particularly the unloading noise.
11) Easy Maintenance and Service:Aside from the screw air end, the two-stage compressor unit's systems and structures are virtually identical to single-stage compression units. This design choice simplifies maintenance and enhances user convenience.
1. Competitive Pricing Edge
We offer customers direct ex-factory prices, significantly boosting their market competitiveness.
2. Direct Transactions
Our products are supplied straight from the factory, ensuring you receive highly cost-effective solutions.
3. Comprehensive OEM & ODM Services
With robust production and management capabilities, our factory offers extensive OEM/ODM services tailored to your needs.
4. Personalized Customization
We accept non-standard orders, including export orders, and can customize voltage, power, pressure, and more. Contact us with your specific requirements.
5. Small Order Acceptance
We welcome small trial orders, enabling you to evaluate the quality of our products with minimal risk.
6. Expedited Delivery
Our commitment to quality ensures timely delivery of premium products.
7. Full Authorization Support
For our distributors, we provide comprehensive authorization certificates, empowering you to sell our esteemed SANZHI brand products with confidence.
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Company Profile
Sanzhi (Henan) Compressor Co., Ltd., with over a decade of esteemed expertise, stands as a premier manufacturer specializing in screw air compressors and screw vacuum pumps. Our extensive and versatile product range encompasses normal pressure/low-pressure screw air compressors, permanent magnet frequency conversion screw air compressors, two-stage compression screw air compressors, screw air compressors for laser cutting, single-tank and double-tank mobile screw air compressors, electric and diesel mobile screw air compressors, and the robust screw vacuum pump, among others.
Our state-of-the-art production lines, tailored for multiple air compressor assemblies, ensure we achieve peak efficiency and modernity. With the dedicated efforts of our 50+ skilled employees, we continuously refine our management systems, including ERP, to minimize lead times and expedite delivery of high-quality products.
A testament to our commitment to excellence, our factory proudly holds the ISO9001 quality management system certification. We rigorously adhere to stringent quality control standards, ensuring that each machine undergoes thorough inspections at every stage-from material inspection to production, and finally, to pre-delivery examination.
Our customer service is unparalleled, offering comprehensive pre-sales guidance to help customers select the perfect air equipment tailored to their diverse needs. We excel in high customization, from appearance to allocation, and even offer bespoke OEM solutions to meet specific dealer demands. Our dedicated sales & service team ensures rapid, 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, top-tier machines, and competitive pricing, we provide a trustworthy and satisfactory compressed air solution.
Conveniently located in Xinzheng City, Henan Province, China, our factory is just a short journey from Xinzheng International Airport, approximately 30 kilometers away. We warmly welcome you to visit and experience 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, boasting over a decade of experience.
Q2. How do you control quality?
A: 1. We meticulously inspect all raw materials.
2. We implement strict control over installation procedures.
3. Each machine undergoes a 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 standard voltage units, we ensure prompt delivery within 15 working days after order confirmation. For non-standard units, please get in touch with our dedicated sales team for precise details.
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 against the B/L copy. Payments are accepted in both USD and RMB.
Q8. How about your warranty?
A: We are proud to offer a comprehensive warranty: a one-year warranty for the entire machine and a two-year warranty specifically for the screw air compressor, not including consumable spare parts.
Q9. What about the maintenance?
A: The initial maintenance should be conducted after 500 hours of operation. Subsequent maintenance is recommended every 2000-3000 hours, depending on the specific operating conditions.
Q10. Can machines be run in high-temperature environments?
A: Absolutely. Our machines are engineered to perform efficiently in high-temperature environments, with an impressive operational range from -20° to 45° (-4ºF to 113ºF).
Q11. Do you offer OEM service?
A: Certainly. Our expert design team is enthusiastic about accommodating both OEM and ODM orders to meet your bespoke needs.
Q12. How long could your air compressor be used?
A: Our air compressors boast a durable lifespan, typically exceeding 10 years of reliable performance.
Q13. Will you provide some spare parts for the machines?
A: Yes, we are committed to providing the necessary spare parts for all our machines.
Q14. How about your after-sales service?
A: We offer robust after-sales support, including online guidance for installation and commissioning. Additionally, we can arrange for our experienced engineers to provide on-site training and installation assistance.
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