China Sanzhi Manufacturer Reliable 90kw 120HP Air Cooling Two-Stage Permanent Magnet VFD Screw Compressor for Low Pressure

• Customization: Available
• After-sales Service: Online Technology Support
• Warranty: 1 Year for The Whole Machine & 2 Years for Airend
• Model NO.: SZ90VF-II
• Cooling System: Air Cooling
• Power Source: AC Power
• Cylinder Position: Vertical
• Structure Type: Closed Type
• Installation Type: Stationary Type
• Type: Twin-Screw Compressor
• Brand Name: Sanzhi
• Power: 90kw
• Exhaust Pressure: 0.5-1.6 MPa
• Weight: 3200kg
• Free Air Delivery* of Unit at Working: 24-11m³/Min
• Condition: New
• Voltage: 220V / 380V / 400V / 415V
• Frame Color: White, Beige and Gray Combination, or Any Color
• Transport Package: Standard Wooden Package
• Specification: 2700*1920*1820mm
• Trademark: SZ
• Origin: Zhengzhou
• HS Code: 8414804990
• Production Capacity: 500PCS/Month
• Package Size: 275.00cm * 197.00cm * 187.00cm
• Package Gross Weight: 3200.000kg

Product Description

Introducing our Low-Pressure Compressor: a marvel of engineering designed for industrial efficiency and performance. Our Two-Stage Compression Permanent Magnet Variable Frequency Drive (VFD) Screw Air Compressor offers a versatile range of power options, including models in 15KW, 22KW, 30KW, 37KW, 45KW, 55KW, 75KW, 90KW, 110KW, 132KW, 160KW, 185KW, 200KW, and 250KW. Tailored to meet the diverse demands of the industrial sector, this compressor ensures optimal energy utilization and superior air delivery, making it the ideal choice for businesses seeking reliability and innovation.


 

Product Structure

Internal Structure Frontside

Internal Structure Backside

Working Principle

In the realm of air compression, achieving efficiency is a delicate balance. Theoretically, the energy needed for single-stage compression matches that of multi-stage processes. Yet, in reality, factors such as coupling power loss, bearing friction, and liquid viscosity cooling effects inflate the actual power demanded. By thoughtfully reducing the compression ratio at each stage, one can curtail the excess energy, ensuring that the total power for multi-stage compression is notably less than its single-stage counterpart.

The intricate design of the two-stage screw air compressor showcases a dual-system approach. Each stage features both an active and a passive screw, driven by an external power mechanism. At the first stage, a low-pressure screw group works its magic, while the second stage employs a high-pressure screw ensemble. Encircling each screw is a precise sealing air film, and as these screws rotate, gas undergoes a transformative journey through suction, pressurization, and exhaust phases.

First Stage Compression: Commencing the two-stage compression sequence, the first stage employs a low-pressure screw group that tightly encloses the gas. Here, gas is drawn into the compression chamber via a suction valve. Under the swift rotation of the screw rotor, the gas is progressively compressed and channeled onward to the subsequent stage.

Second Stage Compression: Within the second stage's compact screw space, gas is subjected to higher temperature and pressure, intensifying the compression process. The exhaust valve then activates, efficiently expelling the high-pressure gases from the system, marking the culmination of the compression cycle.

As natural air filters into the initial compression stage, it unites with a trace of lubricating oil within the chamber, compressing to interstage pressures. This mixture flows through cooling channels, encountering an oil mist that significantly cools the gas. Entering the second-stage rotor, the gas undergoes further compression, achieving final exhaust pressure. Ultimately, the compressor releases it via the exhaust valve, completing the entire efficient compression operation.

 

Detailed Photos

1) High Efficiency of PM Motor: Experience unparalleled efficiency with our permanent magnet motor, boasting a wide constant torque and weak magnetic range. This motor is 20-30% more efficient than standard motors, consistently maintaining superior efficiency, even when operating away from the rated frequency.

2) Two-Stage Compression Unique Air End: Our innovative two-stage compression screw machine features a uniquely designed air end. By integrating the first and second-stage compression rotors within a single housing and driving them directly via gears, each rotor achieves optimal linear speed, resulting in enhanced compression efficiency.

3) Integrated Frequency Converter: Leveraging the top-tier frequency system in China, our compressor offers a broad spectrum of speed regulation. Its highly accurate frequency modulation meets actual gas demands, delivering exceptional energy-saving benefits.

 

4) Reduce Internal Leakage: By employing two-stage compression, we reduce the compression ratio for each stage and minimize internal leakage from high to low-pressure ends, thereby boosting volume efficiency.

5) Variable Frequency Start and Soft Start of the motor significantly reduces the impact on power grid equipment, ensuring no damage to electrical systems.

6) Reduce Energy Consumption: With a frequency conversion range of 25% to 100% (ordinary conversion is 50% to 100%), our system saves over 30% energy compared to fixed-speed compressors. It also outperforms regular variable frequency compressors by about 5%, with more noticeable energy savings as system gas consumption fluctuates.

7) No Transmission Loss: Featuring a compact structure, our permanent magnet motor and compressor use an embedded integrated shaft with a direct connection, eliminating couplings and other transmission parts for 100% transmission efficiency.

8) Air Cooling Method: Our high energy-saving air cooling method delivers exceptional cooling, significantly lowering compressed air temperatures and achieving near-isothermal compression. This method also reduces the pressure loss between the first and second stages, lowering the compression ratio and enhancing efficiency.

9)Smart Touch Controller:Our system's advanced intelligence minimizes manual intervention, featuring a high-precision color electronic screen with clear graphical displays for maintenance alerts, fault alarms, and safety shutdown notifications.
 

10)Special Type Intake Valve: This valve automatically controls opening to ensure proper fuel injection and lubrication flow, while minimizing oil circuit loss to enhance overall efficiency.
Ultra-low oil circuit loss, overall efficiency improvement.
The normally open solenoid valve closes automatically in emergencies, preventing oil injection.

11)Excellent Air Filter: Our air filter excels in air purification, providing a clean air system with three-stage filtration to meet emission standards. It effectively removes steam and minor dust gas, ensuring optimal air quality.

12)High-Quality Soundproof Cotton: The compact noise reduction housing eliminates operational vibration amplitude, working with premium soundproof cotton to significantly enhance noise reduction levels.
 

13) Motor Maintenance-Free: Our permanent magnet motor is designed without internal bearings, eliminating motor bearing maintenance and replacement costs entirely.

14)Noise reduction: Experience a quieter work environment with our advanced two-stage compression technology that significantly lowers the compression ratio. This innovation not only reduces operational noise but also particularly minimizes the unloading noise, ensuring a more pleasant and efficient working atmosphere.

15)Easy to do maintenance and service: Our two-stage compressor unit is designed with user convenience in mind. Apart from the screw air end, the systems and structures closely resemble those of single-stage compressors, making maintenance straightforward and user-friendly. This design simplifies service routines, enabling effortless upkeep and reliable operation for users.

 

Product Parameters

Model	Power	Exhaust pressure	Free air delivery* of unit at working pressure	Voltage	Frequency	Air outlet discharge size	Weight	Dimensions
	KW	Mpa	m³/min	V	Hz	Inch	Kg	L*W*H(mm)
SZ15VF-II	15	0.5	4.00	380	50	G1½	660	1450*780*1180
		0.8	3.00
		1.3	2.00
SZ19VF-II	18.5	0.5	5.00	380	50	G1½	680	1450*780*1180
		0.8	4.00
		1.3	3.80
		1.6	2.20
SZ22VF-II	22	0.5	6.60	380	50	G1½	730	1650*880*1280
		0.8	4.20
		1.3	3.00
		1.6	2.50
SZ30VF-II	30	0.5	7.00	380	50	G1½	980	2000*1260*1560
		0.8	6.40
		1.3	4.00
		1.6	3.00
SZ37VF-II	37	0.5	10.00	380	50	G1½	1080	2000*1260*1560
		0.8	7.00
		1.3	5.50
		1.6	4.00
SZ45VF-II	45	0.5	13.00	380	50	G2	1980	2000*1260*1560
		0.8	10.00
		1.3	6.50
		1.6	5.00
SZ55VF-II	55	0.5	17.00	380	50	G2	2180	2150*1300*1730
		0.8	12.00
		1.3	8.60
		1.6	5.00
SZ75VF-II	75	0.5	20.00	380	50	G2	2280	2150*1300*1730
		0.8	16.50
		1.3	11.00
		1.6	9.00
SZ90VF-II	90	0.5	24.00	380	50	DN65	3200	2700*1920*1820
		0.8	20.00
		1.3	14.00
		1.6	11.00
SZ110VF-II	110	0.5	28.00	380	50	DN65	3360	2700*1920*1820
		0.8	24.50
		1.3	18.00
		1.6	14.00
Due to product updates, the above parameters are subject to deviation in kind.

Our Advantages

1. Unbeatable Price Edge

We deliver ex-factory prices straight to our customers, empowering them with a competitive edge in the market.

2. Seamless Direct Transactions
All our products come directly from the factory, ensuring you receive more cost-effective solutions without any middlemen.

3. Comprehensive OEM & ODM Services
Harnessing our robust production and management capabilities, our factory is ready to provide tailored OEM/ODM services just for you.

4. Personalized Customization
We embrace non-standard and export orders, customizing voltage, power, pressure, among others, to meet your specific needs. Reach out to us with your requirements.

5. Flexible Small Order Acceptance
Initiate with a small trial order to experience the superior quality of our products firsthand.

6. Swift and Reliable Delivery
Enjoy the assurance of high-quality products delivered with prompt and efficient service.

7. Full Authorization for Distributors
We provide comprehensive authorization certificates, empowering distributors to promote and sell our prestigious SANZHI brand products with confidence.

 

Packaging & Shipping

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Company Profile

Sanzhi (Henan) Compressor Co., Ltd is a distinguished manufacturer with over a decade of expertise in crafting exceptional screw air compressors and screw vacuum pumps. Our expansive range of products encompasses normal and low-pressure screw air compressors, innovative permanent magnet frequency conversion screw air compressors, advanced two-stage compression screw air compressors, specialized screw air compressors for laser cutting, and versatile mobile options such as single-tank and double-tank mobile screw air compressors, as well as electric and diesel variants. Additionally, we produce high-performance screw vacuum pumps, designed to meet diverse industrial needs with precision and reliability.

Our production processes are streamlined for maximum efficiency, utilizing state-of-the-art multi-air compressor assembly lines. With a dedicated team of over 50 skilled employees, we continuously refine our management systems, including ERP, to minimize lead times and ensure the rapid delivery of top-quality products. Our commitment to excellence guarantees that every unit meets the highest standards.

Our management practices align with the prestigious ISO9001 quality management system certification, underscoring our dedication to maintaining rigorous quality standards. We enforce comprehensive quality control processes, ensuring that each machine undergoes meticulous material inspection, production evaluation, and pre-delivery assessment. Our unwavering commitment to quality ensures that every product embodies our promise of reliability and efficiency.

Our customer service is characterized by a dual focus on pre-sales and after-sales excellence. In pre-sales, we offer expert guidance in selecting the optimal air equipment for various facilities, complete with extensive customization options for appearance and configuration. We excel in OEM services, crafting unique products to meet the specific needs of our dealers. Our after-sales support is bolstered by a professional sales and service team, ready to provide swift and effective responses to any customer inquiries, ensuring a seamless experience.

At Sanzhi (Henan) Compressor Co., Ltd, we are driven by a commitment to deliver superior, stable products that foster enduring relationships with our clients. Through our focus on efficient delivery, impeccable quality, and competitive pricing, we are your trusted partner in providing exceptional compressed air solutions that meet and exceed expectations.

Our factory, situated in the heart of Xinzheng City, Henan Province, China, is easily accessible. We offer convenient transportation from Xinzheng International Airport to our facility, a mere 30 kilometers away, typically a one-hour journey. We warmly invite you to visit our company and witness our innovation and dedication firsthand!

Certifications

 

Successful Cases

FAQ
Q1. Are you a trading company or manufacturer?
A: We are proud to be a professional manufacturer specializing in screw air compressors, boasting over a decade of industry expertise.

Q2. How do you control quality?
A: 1. Our vigilant quality checks start from the root by strictly inspecting all raw materials.
2. Precision and accuracy are ensured by strictly controlling all installation procedures.
3. Each machine undergoes rigorous testing, with a minimum of 5 hours of continuous operation before it earns the right to leave our factory.

Q3. What information must I provide to get the suitable machine?
1. How much air delivery capacity do you need (Unit: CFM or m³/Min)?
2. What is the required working pressure (Unit: PSI, Bar or Mpa)?
3. What is your country's voltage and frequency (V/Hz)?
4. Do you need additional accessories such as an air tank, filters, or air dryers?
Provide us with these details, and we will tailor a perfect solution for you!

Q4. What is the general unit conversion?
1Bar equals 0.1Mpa or 14.5PSI
1m³/min is equivalent to 35.32cfm
1KW translates to 1.34HP

Q5. What is the available voltage air compressor?
A: Sanzhi provides compressors with voltages including 380v/50hz/3p, 400v/50hz/3p, 415v/50hz/3p, 220v/60hz/3p, and 440v/60hz/3p, plus customization to fit your specific needs.

Q6. How long is the delivery time?
A: Delivery for standard voltage units is 15 working days post order confirmation. For non-standard options, please consult with our sales team.

Q7. What's the payment term?
A: The payment terms are 30% T/T in advance, 40% T/T before shipment, with the remaining 30% T/T against the B/L copy. We accept both USD and RMB.

Q8. How about your warranty?
A: Enjoy peace of mind with a one-year warranty on the entire machine and a two-year warranty on the screw air compressor, excluding consumable spare parts.

Q9. What about the maintenance?
A: The first maintenance is required after 500 hours of operation, followed by regular maintenance every 2000-3000 hours, tailored to the actual working environment.

Q10. Can machines be run in high-temperature environment?
A: Absolutely, our machines are engineered to perform in high-temperature environments, functioning optimally within a range of -20° to 45° (-4ºF-113ºF).

Q11. Do you offer OEM service?
A: Yes, indeed! Our skilled design team is ready to accommodate both OEM & ODM orders, welcoming your unique requirements.

Q12. How long could your air compressor be used?
A: Our durable air compressors are built to last, offering more than 10 years of reliable service.

Q13. Will you provide some spare parts for the machines?
A: Certainly, we are committed to supplying spare parts as needed.

Q14. How about your after-sales service?
A: We offer comprehensive after-sales support, including online installation and commissioning instructions, along with the option to have our engineers assist with training and installation.