Product Description

Product Structure

 

Internal Structure Frontside

Internal Structure Backside

Working Principle

In the ideal scenario of air compression, the energy required for single-stage pressure transmission equates to the cumulative energy needed for multi-stage compression. In reality, due to factors such as coupling transmission losses, bearing friction, and the viscosity’s cooling effect, the actual operational power increases. By minimizing the compression ratio at each stage, we can lower the overall power consumption in multi-stage compression, making it more efficient than single-stage compression.

The two-stage screw air compressor features a dual-stage rotary screw system, with each stage comprising an active and a passive screw. The active screw propels the passive screw using an external power mechanism. The initial stage employs a low-pressure rate screw group, while the second stage utilizes a high-pressure rate screw group. Encircling each screw is a sealing air film. During rotation, air undergoes 3 core processes: suction, pressurization, and exhaust.

First Stage Compression: The initial stage of the two-stage screw air compressor employs a low-pressure rate screw group, compressing the gas between them. The gas is drawn into the compression chamber via the suction valve. With the high-speed rotation of the screw rotor, the gas is gradually compressed and transferred to the subsequent stage.

Second Stage Compression: In this stage, the gas enters a more confined screw space, experiencing higher temperatures and pressures. The exhaust valve then opens to expel the high-pressure gases from the system.

Natural air is drawn into the first compression stage through an air filter, where it mixes with a small amount of lubricating oil. This mixture is compressed to an interstage pressure. The compressed gas then passes through a cooling channel, where it encounters significant oil mist, substantially reducing its temperature. This cooled gas enters the second-stage rotor for further compression, CHINAMFG the final exhaust pressure. Ultimately, the compressor expels the gas through the exhaust valve, completing the entire compression cycle.
 

Product Parameters

 

Sanzhi (ZheJiang ) Compressor Co,. Ltd.
Two-Stage Compression Permanent Magnet Variable Frequency Screw Air Compressor
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.

 

Detailed Photos

 

 

 

 

 

1) Unparalleled Efficiency of PM Motor:The constant torque and weak magnetic ranges are significantly wider, offering 20-30% higher efficiency compared to conventional motors. Even away from the rated frequency, the permanent magnet motor maintains its outstanding efficiency, ensuring exceptional performance at all times.

2) Maintenance-Free Motor:Our permanent magnet motor is designed without bearings, eliminating the need for costly bearing maintenance and replacement.

3) Advanced Integrated Frequency Converter:Featuring China’s top frequency system, this unit offers extensive speed regulation and high precision. It adapts to the actual gas demand with remarkable energy-saving results.
 

4) Zero Transmission Loss:The permanent magnet motor and compressor utilize a compact, integrated shaft connection. This direct drive structure eliminates couplings and other transmission components, ensuring 100% transmission efficiency.

5) Variable and Soft Start MechanismsThe variable frequency start and soft start functionalities minimize impact on power grid equipment, preventing damage to electrical components.

6) Enhanced Energy Conservation:With a frequency conversion range from 25% to 100% (compared to the ordinary 50%-100%), this unit delivers over 30% energy savings against fixed-speed compressors. For systems with fluctuating gas consumption, the energy-saving impact is even more pronounced.
 

7) Unique Two-Stage Compression Air End:Our two-stage compression screw design combines both first and second-stage rotors within a single casing. Gears drive each stage to achieve optimal linear speeds, enhancing overall compression efficiency.

8) Innovative Internal Spray Curtain Cooling:Employing a high-energy saving internal spray curtain cooling method, it significantly lowers compressed air temperature, achieving nearly isothermal compression. This method reduces pressure loss and enhances compression efficiency.

9) Minimized Internal Leakage:By adopting two-stage compression, we lower the compression ratio for each stage, reducing internal leakage and improving volumetric efficiency.
 

10) Superior Noise Reduction:Two-stage compression not only reduces the compression ratio but also significantly cuts down noise levels, particularly during unloading.

11) Effortless Maintenance and Service:Apart from the screw air end, the two-stage compressor’s systems and structures are similar to single-stage compression units, ensuring convenience in maintenance and usage for users.

Packaging & Shipping

Our Advantages

 

1. Unbeatable Price Advantage
We offer customers competitive ex-factory prices directly, ensuring you stay ahead of the market.

2. Direct Transactions
All our products are supplied straight from the factory, enabling us to offer you more cost-effective options.

3. Comprehensive OEM & ODM Services
With our robust production and management capabilities, we can cater to your OEM/ODM service needs seamlessly.

4. Tailored Customization
We welcome non-standard, export, voltage/power/pressure custom orders. Contact us to discuss your specific requirements and we will fulfill your demands.

5. Small Order Acceptance
Start with a small trial order to evaluate the premium quality of our products.

6. Rapid Delivery
We promise timely delivery of our high-quality products, ensuring your operations run smoothly.

7. Comprehensive Authorization
For distributors, we provide full authorization certification, empowering you to sell our prestigious SANZHI brand products.
 

More Products

 

Company Profile

 

 

Sanzhi (ZheJiang ) Compressor Co., Ltd. is a renowned manufacturer specializing in the production of screw air compressors and screw vacuum pumps, boasting over a decade of industry expertise. Our extensive product portfolio includes normal pressure and 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 screw vacuum pumps, among others.
In our state-of-the-art production facility, we achieve unparalleled efficiency through our advanced, lean multi-air compressor assembly lines. Supported by a dedicated team of over 50 employees, we continuously enhance our management systems, including ERP, to reduce lead times and ensure the rapid delivery of high-quality products.

In our commitment to quality management, our factory has earned ISO9001 certification. We rigorously adhere to stringent quality management protocols, ensuring each machine undergoes thorough inspections, including material checks, production evaluations, and pre-delivery assessments.

Our superior customer service extends from pre-sales to after-sales. Before purchase, we provide expert guidance in selecting the ideal air equipment and offer high levels of customization, including unique OEM products designed to meet specific dealer requirements. Post-purchase, our professional sales and service team is always ready to respond swiftly to customer needs.

At Sanzhi (ZheJiang ) Compressor Co., Ltd., we are dedicated to delivering superior, reliable products and fostering long-term customer relationships. With our commitment to efficient delivery, exceptional quality, and competitive pricing, we are your trusted partner for optimal compressed air solutions.

Our factory is conveniently located in HangZhou City, ZheJiang Province, China. We offer complimentary transportation from HangZhou International Airport to our facility, just 30 kilometers away, approximately a one-hour journey. We look CHINAMFG to welcoming you to our company!

FAQ
Q1. Are you a trading company or manufacturer?
A: We are a professional manufacturer of screw air compressors, with over 10 years of industry experience.

Q2. How do you control quality?
A: 1. We conduct stringent inspections of all raw materials.
2. We maintain strict control over installation procedures.
3. Each machine undergoes a minimum of 5 hours of continuous testing before dispatch.

Q3. What information must I provide to get the suitable machine?
1. Desired air delivery capacity (Unit: CFM or m³/Min)
2. Required working pressure (Unit: PSI, Bar or Mpa)
3. Voltage and frequency in your country (V/Hz)
4. Additional accessories needed, such as air tanks, filters, or air dryers.
Provide us with this information, and we will tailor a solution for you!

Q4. What is the general unit conversion?
1Bar = 0.1Mpa = 14.5PSI
1m³/min = 35.32cfm
1KW = 1.34HP

Q5. What are the available voltage options for air compressors?
A: Sanzhi air compressors are available in 380v/50hz/3p, 400v/50hz/3p, 415v/50hz/3p, 220v/60hz/3p, and 440v/60hz/3p, with further customization options available to meet your specific needs.

Q6. How long is the delivery time?
A: For standard voltage, our delivery time is a swift 15 working days post-confirmation of your order. For non-standard requirements, kindly reach out to our dedicated sales team for assistance.

Q7. What’s the payment term?
A: We accept 30% T/T in advance, 40% T/T before shipment, and the final 30% T/T CHINAMFG receipt of the B/L copy. Payments can be made in USD or RMB.

Q8. How about your warranty?
A: We offer a comprehensive one-year warranty for the entire machine and an extended two-year warranty for the screw air compressor, excluding consumable spare parts.

Q9. What about the maintenance?
A: The first maintenance should be conducted after 500 hours of operation. Subsequently, regular maintenance should be performed every 2000-3000 hours, considering 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 a working temperature range from -20° to 45°(-4ºF to 113ºF).

Q11. Do you offer OEM service?
A: Yes, we proudly offer OEM & ODM services. With our expert design team, customized orders are highly welcomed.

Q12. How long could your air compressor be used?
A: Our air compressors are built for durability and can generally be used for more than 10 years.

Q13. Will you provide some spare parts for the machines?
A: Certainly, we provide spare parts to ensure the seamless operation of your machines.

Q14. How about your after-sales service?
A: We offer comprehensive after-sales support, including online installation and commissioning instructions, and can arrange for our skilled engineers to assist with training and installation.

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How are air compressors utilized in the aerospace industry?

Air compressors play a crucial role in various applications within the aerospace industry. They are utilized for a wide range of tasks that require compressed air or gas. Here are some key uses of air compressors in the aerospace industry:

1. Aircraft Systems:

Air compressors are used in aircraft systems to provide compressed air for various functions. They supply compressed air for pneumatic systems, such as landing gear operation, braking systems, wing flap control, and flight control surfaces. Compressed air is also utilized for starting aircraft engines and for cabin pressurization and air conditioning systems.

2. Ground Support Equipment:

Air compressors are employed in ground support equipment used in the aerospace industry. They provide compressed air for tasks such as inflating aircraft tires, operating pneumatic tools for maintenance and repair, and powering air-driven systems for fueling, lubrication, and hydraulic operations.

3. Component Testing:

Air compressors are utilized in component testing within the aerospace industry. They supply compressed air for testing and calibrating various aircraft components, such as valves, actuators, pressure sensors, pneumatic switches, and control systems. Compressed air is used to simulate operating conditions and evaluate the performance and reliability of these components.

4. Airborne Systems:

In certain aircraft, air compressors are employed for specific airborne systems. For example, in military aircraft, air compressors are used for air-to-air refueling systems, where compressed air is utilized to transfer fuel between aircraft in mid-air. Compressed air is also employed in aircraft de-icing systems, where it is used to inflate inflatable de-icing boots on the wing surfaces to remove ice accumulation during flight.

5. Environmental Control Systems:

Air compressors play a critical role in the environmental control systems of aircraft. They supply compressed air for air conditioning, ventilation, and pressurization systems, ensuring a comfortable and controlled environment inside the aircraft cabin. Compressed air is used to cool and circulate air, maintain desired cabin pressure, and control humidity levels.

6. Engine Testing:

In the aerospace industry, air compressors are utilized for engine testing purposes. They provide compressed air for engine test cells, where aircraft engines are tested for performance, efficiency, and durability. Compressed air is used to simulate different operating conditions and loads on the engine, allowing engineers to assess its performance and make necessary adjustments or improvements.

7. Oxygen Systems:

In aircraft, air compressors are involved in the production of medical-grade oxygen for onboard oxygen systems. Compressed air is passed through molecular sieve beds or other oxygen concentrator systems to separate oxygen from other components of air. The generated oxygen is then supplied to the onboard oxygen systems, ensuring a sufficient and continuous supply of breathable oxygen for passengers and crew at high altitudes.

It is important to note that air compressors used in the aerospace industry must meet stringent quality and safety standards. They need to be reliable, efficient, and capable of operating under demanding conditions to ensure the safety and performance of aircraft systems.

How are air compressors utilized in pneumatic tools?

Air compressors play a crucial role in powering and operating pneumatic tools. Here’s a detailed explanation of how air compressors are utilized in pneumatic tools:

Power Source:

Pneumatic tools rely on compressed air as their power source. The air compressor generates and stores compressed air, which is then delivered to the pneumatic tool through a hose or piping system. The compressed air provides the force necessary for the tool to perform various tasks.

Air Pressure Regulation:

Air compressors are equipped with pressure regulation systems to control the output pressure of the compressed air. Different pneumatic tools require different air pressure levels to operate optimally. The air compressor’s pressure regulator allows users to adjust the output pressure according to the specific requirements of the pneumatic tool being used.

Air Volume and Flow:

Air compressors provide a continuous supply of compressed air, ensuring a consistent air volume and flow rate for pneumatic tools. The air volume is typically measured in cubic feet per minute (CFM) and determines the tool’s performance capabilities. Higher CFM ratings indicate that the pneumatic tool can deliver more power and operate at a faster rate.

Tool Actuation:

Pneumatic tools utilize compressed air to actuate their mechanical components. For example, an air-powered impact wrench uses compressed air to drive the tool’s internal hammer mechanism, generating high torque for fastening or loosening bolts and nuts. Similarly, air-powered drills, sanders, nail guns, and spray guns rely on compressed air to power their respective operations.

Versatility:

One of the significant advantages of pneumatic tools is their versatility, and air compressors enable this flexibility. A single air compressor can power a wide range of pneumatic tools, eliminating the need for separate power sources for each tool. This makes pneumatic tools a popular choice in various industries, such as automotive, construction, manufacturing, and woodworking.

Portability:

Air compressors come in different sizes and configurations, offering varying degrees of portability. Smaller portable air compressors are commonly used in applications where mobility is essential, such as construction sites or remote locations. The portability of air compressors allows pneumatic tools to be used in various work environments without the constraints of being tethered to a fixed power source.

Overall, air compressors are integral to the functionality and operation of pneumatic tools. They provide the necessary power, air pressure regulation, and continuous airflow required for pneumatic tools to perform a wide range of tasks efficiently and effectively.

How is air pressure measured in air compressors?

Air pressure in air compressors is typically measured using one of two common units: pounds per square inch (PSI) or bar. Here’s a brief explanation of how air pressure is measured in air compressors:

1. Pounds per Square Inch (PSI): PSI is the most widely used unit of pressure measurement in air compressors, especially in North America. It represents the force exerted by one pound of force over an area of one square inch. Air pressure gauges on air compressors often display pressure readings in PSI, allowing users to monitor and adjust the pressure accordingly.

2. Bar: Bar is another unit of pressure commonly used in air compressors, particularly in Europe and many other parts of the world. It is a metric unit of pressure equal to 100,000 pascals (Pa). Air compressors may have pressure gauges that display readings in bar, providing an alternative measurement option for users in those regions.

To measure air pressure in an air compressor, a pressure gauge is typically installed on the compressor’s outlet or receiver tank. The gauge is designed to measure the force exerted by the compressed air and display the reading in the specified unit, such as PSI or bar.

It’s important to note that the air pressure indicated on the gauge represents the pressure at a specific point in the air compressor system, typically at the outlet or tank. The actual pressure experienced at the point of use may vary due to factors such as pressure drop in the air lines or restrictions caused by fittings and tools.

When using an air compressor, it is essential to set the pressure to the appropriate level required for the specific application. Different tools and equipment have different pressure requirements, and exceeding the recommended pressure can lead to damage or unsafe operation. Most air compressors allow users to adjust the pressure output using a pressure regulator or similar control mechanism.

Regular monitoring of the air pressure in an air compressor is crucial to ensure optimal performance, efficiency, and safe operation. By understanding the units of measurement and using pressure gauges appropriately, users can maintain the desired air pressure levels in their air compressor systems.

<img src="https://img.hzpt.com/img/air-compressor/air-compressor-L1.webp" alt="China factory Industrial Energy Saving Electric Variable Frequency Converter Drive Pm VSD/VFD Inverter Direct Driven Double Screw Type Air Compressor in Zhengzhou China with high quality”><img src="https://img.hzpt.com/img/air-compressor/air-compressor-L2.webp" alt="China factory Industrial Energy Saving Electric Variable Frequency Converter Drive Pm VSD/VFD Inverter Direct Driven Double Screw Type Air Compressor in Zhengzhou China with high quality”>
editor by lmc 2024-09-09