Internal Structure Frontside
Internal Structure Backside
Working Principle
In an ideal air compression process, the power needed for single-stage pressure transmission equals the sum of the power needed for multi-stage compression. However, in real-world scenarios, actual working power increases due to factors such as coupling transmission power loss, bearing friction, and the cooling effect of liquid viscosity. Consequently, lowering the compression ratio for each stage can reduce unnecessary 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. Each stage includes an active screw and a passive screw, with the active screw driving the passive screw via an external power transmission device. The first stage uses a low-pressure rate screw group, while the second stage employs a high-pressure rate screw group. Each screw is surrounded by a sealing air film. During rotation, the gas undergoes compression through three stages: suction, pressurization, and exhaust.
First Stage Compression: Utilizing a low-pressure rate screw group, the first stage of the two-stage screw air compressor compresses the gas. The gas enters the screw compression chamber through the suction valve. With the high-speed rotation of the screw rotor, the gas is gradually squeezed and transferred to the second stage.
Second Stage Compression: In the second stage, the gas enters a more confined screw space and undergoes compression at higher temperatures and pressures. The exhaust valve then opens, releasing high-pressure gases from the system.
Natural air is drawn into the first compression stage via the air filter, where it mixes with a small amount of lubricating oil. This mixed gas is compressed to interstage pressure and then enters the cooling channel, encountering a substantial amount of oil mist to significantly reduce its temperature. The cooled, compressed gas moves into the second-stage rotor for further compression to the final exhaust pressure. The entire compression process concludes with the gas being discharged through the exhaust valve.
Water-cooled compressors leverage water as a cooling medium to deliver multiple benefits. As the cooling water circulates within the air compressor, it effectively cleans, lubricates, and extends the lifespan of frictional components. During operation, the cooling water absorbs heat from the cylinder and compressed gas, significantly lowering exhaust temperatures and reducing power consumption, ultimately minimizing operating costs. However, it's crucial to manage the scaling issues that can arise in the water cooling system.
1) High efficiency of PM motor: The permanent magnet (PM) motor boasts a broader constant torque range and a superior weak magnetic range. It outperforms regular motors by 20-30% in efficiency. Even when operating away from its rated frequency, the PM motor maintains high efficiency, ensuring optimal performance at all times.
2) Motor maintenance-free:With no bearings inside the permanent magnet motor, users can eliminate the costs associated with motor bearing maintenance and replacement.
3) Integrated frequency converter: Utilizing a top-tier frequency system in China, this compressor offers a wide range and high precision in speed regulation. It adjusts according to the user's real-time gas demand, resulting in significant energy savings.
4) No transmission loss: Thanks to the embedded integrated shaft directly connecting the permanent magnet motor and the compressor, the structure is more compact. This design eliminates couplings and other transmission parts, achieving 100% transmission efficiency.
5) Variable frequency start and the soft startof the motor minimize the impact on the power grid and prevent damage to electrical equipment.
6) Reduce energy consumption: The frequency conversion range spans from 25% to 100% (compared to 50% to 100% for ordinary frequency conversions). This results in over 30% energy savings compared to fixed-speed compressors and about 5% more savings than standard variable frequency compressors. The greater the fluctuation in system gas consumption, the more pronounced the energy-saving benefits.
7) Two-stage compression unique air end:Designed with a unique two-stage compression screw mechanism, this air end houses both the first-stage and second-stage compression rotors. These rotors operate directly via gears, achieving optimal linear speeds and enhancing compression efficiency.
8) Internal spray curtain cooling method: The high-energy saving internal spray curtain cooling method provides excellent cooling effects, drastically lowers the temperature of compressed air, and approaches isothermal compression. It also reduces pressure loss between stages, lowers the compression ratio, and boosts compression efficiency.
9) Reduce internal leakage:By adopting two-stage compression, the compression ratio for each stage is reduced, minimizing internal leakage from high to low pressure ends and improving volumetric efficiency.
10) Noise reduction:Two-stage compression also reduces the compression ratio, significantly cutting down on overall noise, especially during unloading phases.
11) Easy to do maintenance and service:The design of the two-stage compressor unit, apart from the screw air end, mirrors the single-stage compression systems and structures, simplifying maintenance and user operations.
1. Price Advantage
We offer ex-factory prices directly to our customers, ensuring you remain highly competitive in the market.
2. Direct Deal
Our products are supplied straight from the factory, guaranteeing you receive the most cost-effective solutions.
3. OEM & ODM Services
With robust production and management capabilities, our factory provides comprehensive OEM and ODM services tailored to your needs.
4. Customized Service
We accommodate non-standard, export orders, and specific requirements for voltage, power, and pressure. Contact us for personalized solutions.
5. Accept Small Orders
Initiate with a small trial order to evaluate the exceptional quality of our products.
6. Fast Delivery
Experience the excellence of our high-quality products delivered promptly.
7. Complete Authorization
We provide full authorization certificates to our distributors, empowering you to sell genuine SANZHI brand products with confidence.
More Products
Successful Cases
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 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.
){kind=link}