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China, Chinese 75 HP 55 Kw Energy Saving Screw Compressor Two-Stage Variable Speed Screw Air Compressor1 Industrial Products Supplier Manufacturer Details, price list catalog:
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CompressorScrew CompressorScrew Air CompressorAir Compressor
Shanghai Rocky Machinery Co., Ltd.
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Product Description Product Description75 HP 55 kW high efficiency and energy saving screw compressor two-stage variable speed screw air compressorThis high-end screw air compressor combines two-stage compression technology, a permanent magnet synchronous motor, and variable frequency drive technology. With a rated power of 55 kW, it is a highly efficient, energy-saving, and stable compressed air source.? 55 kW: Refers to the rated power of the drive motor, a key indicator of the equipment's energy consumption and output capacity.? Two-stage compression: The air compression process is completed in two stages. Air first enters the first compression unit for initial compression, then, after cooling, enters the second compression unit for final compression, ultimately reaching the desired pressure.? Permanent magnet variable frequency drive:Permanent magnet: Refers to the use of a permanent magnet synchronous motor (PMSM). The rotor is made of permanent magnet material, requires no excitation current, and has extremely high efficiency.Variable frequency: Refers to the use of a variable frequency drive (VFD) to adjust the motor speed in real time, thereby controlling the compressor's exhaust volume and power consumption to match actual air demand.Technical Parameters Two-stage PM VSD Screw Air CompressorModelAir Delivery (m3min)Power(kW/hp)NoisedB(A)OutletdiameterDimensions(mm)Weight(kg)7 bar8 bar10 bar13 barL*W*HRK30APMI1.4-4.51.3-4.21.1-3.50.8-2.7 22/3068 G1121350*850*1110600 RK40APMII1.8-6.01.7-5.91.4-4.7 1.2-4.0 30/4068 G1121200*1000*1350700 RK50APMII2.3-7.52.1-6.91.8-6.0 1.6-5.4 37150 68 G1121500*1000*1350750 RK60APMII3.2-10.53.0-9.92.3-7.8 2.0-6.8 45/6072 G22100*1300*16501250 RK75APMII4.1-13.63.8-12.53.0-10.1 2.3-7.5 55175 76 G22100*1300*16501300 RK100APMII4.8-16.04.7-15.53.8-12.83.1-10.2 75/10076 G22100*1300*16501350 RK125APMII6.2-20.75.9-19.54.8-16.24.2-14.0 90/12576 DN802500*1650*19002700 RK150APMII7.4-24.87.2-24.06.1-20.24.8-16.0110/15076 DN802500*1650*19002800 RK175APMII8.7-29.08.4-28.07.1-23.75.7-19.0132/17578 DN802500*1650*19003000 RK220APMII10.2-34.09.8-32.58.4-28.06.9-23.0160/22078 DN803000*1900*19504300 RK250APMII11.7-39.010.8-36.09.6-32.08.3-27.5185/25078 DN803000*1900*19504400 RK275APMII13.1-43.512.3-41.010.7-35.59.5-31.5200/27578 DN1003600*2200*22005000 RK300APMI15.5-51.514.5-48.311.6-38.510.7-35.5220/30082 DN1003600*2200*22005500 RK350APMII16.2-54.015.3-51.013.5-45.011.4-38.0250/35082 DN1003600*2200*22006000 RK375APMII18.0-60.017.1-57.015.0-50.012.9-43.0280/37582 DN1253600*2200*22006800 RK420APMI19.5-65.018.6-62.016.8-56.015.2-50.5315/42082 DN1254200*2300*23508000 RK480APMII22.5-75.021.9-73.019.2-64.016.5-55.0355/48082 DN1504200*2200*23508500 RK540APMII25.2-84.024.6-82.021.6-72.018.3-61.0400/54082 DN1504200*2200*23509800 Features and AdvantagesWhat are its core advantages compared to traditional mains frequency air compressors and standard variable frequency air compressors?This combined technology creates a synergistic effect of "1+1+1 > 3," with significant advantages:1. Extreme energy savings and outstanding power savingsTwo-stage compression: Two-stage compression distributes the compression ratio, reduces internal leakage, and lowers bearing load, resulting in approximately 10-15% higher mechanical efficiency than single-stage compression.Permanent magnet motor: Permanent magnet motors are 5-10% more efficient than standard asynchronous motors and maintain high efficiency even at low speeds (high starting torque and no excitation loss).Variable frequency control: Air is supplied on demand, avoiding wasteful no-load operation. Especially in applications with large fluctuations in air consumption, energy savings can reach over 30%.Combined benefits: The combination of these three features makes this air compressor the most energy-efficient choice under most operating conditions, with electricity costs being its greatest advantage.2. Higher Reliability and StabilityTwo-Stage Compression: Each stage offers a lower compression ratio, less bearing load, more even rotor forces, significantly reduced temperatures and bearing loads, and longer core engine life.Variable Frequency Soft Start: The inverter controls the motor for smooth startup, eliminating inrush current (only 1-2 times the rated current), minimizing impact on the power grid and mechanical components, and extending equipment life.Constant Pressure Gas Supply: Variable frequency control maintains highly stable outlet pressure (e.g., within a set range of ±0.1 bar), improving production efficiency and product quality for downstream gas-consuming equipment.3. Excellent Environmental Performance and Low NoiseLow Noise: Variable frequency operation maintains a lower speed for most of the time, significantly reducing mechanical wear and noise.Environmentally Friendly: Extremely high energy efficiency means reduced carbon emissions, complying with national green manufacturing and energy conservation and emission reduction policies.4. Wide Adjustment Range and Intelligent ControlVFDs allow air compressors to operate efficiently over a wide speed range (e.g., 25%-100%), and their displacement adjustment range far exceeds the "load-and-unload" mode of conventional AC units.They are typically equipped with advanced intelligent controllers that support remote monitoring, fault diagnosis, networked control, and data export, facilitating unmanned operation and lean management of air compressor stations.Application industryWhat industries and scenarios are this air compressor primarily used for?55kW is a very mainstream power range, suitable for medium to large-scale compressed air needs. Its main application industries include:? Manufacturing: Automotive manufacturing, electronics and electrical appliances, home appliance manufacturing, precision machining, etc., for pneumatic tools, automated production lines, spraying, purge, assembly, and other processes.? Chemical and Plastics: Plastic injection and blow molding (PET preforms, etc.), chemical raw material transportation, mixing, textile and chemical fiber production, etc.? Food and Beverage: Packaging machinery, filling equipment, can production lines, cleaning and purge (requires post-processing equipment to achieve oil-free standards).? Pharmaceutical: Pharmaceutical equipment, API mixing, packaging lines, and laboratory air supply (requires sterile post-processing equipment).? Mining and Building Materials: Mine drilling, cement plant instrumentation and control, pneumatic conveying, etc.? Energy and Utilities: Wastewater treatment, power plant instrumentation and control, laboratories, etc.Packaging & Shipping1.Packing Details: Plywood crate pallet plus foam board and bubble film, Full closed wooden case. 1pcs/each package (for stationary screw air compressor)2.Shipping method: by sea, by LCL/FCL or as requested3.Delivery method: FOB, CFR, CIF and EXW etc.4.Delivery time: in 7-15 days after receiving deposit (customized machines not included)Successful cases Company ProfileShanghai Rocky Machinery Co., Ltd. was established in 2003 and has 18 years of experience in the air compressor industry. It is an innovative enterprise integrating production, trade, service, research and development. We are professional gas compressors manufacturer since 2003, Germany standard, more than 100 workers, annual sales exceeding 20 million US dollars with 13 years of exporting experience, strict quality control and delivery on time. We not only supply gas compressor including screw air compressor, but also supply spares parts and after-treat machines.Our main products series as follows.1. Oil-injection Screw air compressor2. Dry Oil-free Screw air compressor3. Oil-free water lubricated screw air compressor4. Oil-free scroll air compressor5. Oil-free/Oil-lubricated piston compressor6. Mobile Screw air compressor( Motor driven/ Diesel engine driven)7. Oxygen/Nitrogen generators/boosters8. High Pressure Breathing Air Compressor9. Refrigerant air dryer/ Desiccant air dryer10. Precision line filter/ water separatorRocky will continue to promote technological innovation and progress in line with the mission of "innovation reflects value", and achieve win-win results with global partners, suppliers and employees. Create a new world of "energy saving, envir-onmental protection and intelligence" in the field of air compressors.Payment and deliveryAfter Sales Service1.24/7 after sales service support in different languages.2.Follow up the feedback of products in 2 months interval by email or call.3.Guidance of installation and commissioning on site can be provided by factory-trained technicians or local Authorized Service Center.4.Technical training for customers in Rocky air compressor factory or working site.5.All kinds of technical documents in different languages.FAQFrequently Asked Questions (FAQs)Q1: How much more expensive is it than a regular single-stage variable frequency air compressor? What is the payback period?A: The initial purchase cost is typically 20%-30% higher than a single-stage variable frequency air compressor of the same power. However, due to its extreme energy efficiency, in conditions of 24-hour continuous operation or with large fluctuations in gas consumption, the additional investment cost is typically recovered through electricity bill savings within 1-2 years, resulting in significant long-term economic benefits.Q2: Will a permanent magnet motor demagnetize? What is its service life?A: Under normal design and operating conditions, the risk of demagnetization is extremely low. High-quality permanent magnet motors utilize high-temperature-resistant neodymium iron boron magnets and are typically designed to last over 10 years, the same lifespan as the air compressor. Preventing motor overheating (e.g., due to poor cooling) is key to preventing demagnetization.Q3: How does it relate to "Class 1" energy efficiency air compressors?A: The highest level of energy efficiency in the Chinese Air Compressor Energy Efficiency Standard (GB19153) is Class 1. Most 55kW two-stage permanent magnet variable frequency air compressors have specific power parameters far exceeding the Class I energy efficiency standards, making them the preferred technical solution for achieving and exceeding Class I energy efficiency standards.Q4: Will the harmonics generated by the inverter impact the power grid?A: High-quality inverters have built-in AC reactors or optional harmonic filters to effectively suppress harmonics and meet power grid quality requirements. You can request this from the supplier when purchasing, especially if your factory has precision equipment.Q5: Is maintenance the same as for ordinary air compressors?A: The basic process is similar, but the cooling system (especially the intercooler) and motor heat dissipation requirements are higher. High-quality lubricant (coolant) must be used and replaced strictly according to the maintenance interval to prevent damage to the permanent magnet motor due to overheating.Q6: If my gas consumption is very stable, do I still need to buy an inverter? A: If gas demand is constant and continuous, a two-stage compressor with the same power rating may be more cost-effective due to its lower initial cost and high efficiency at full load. However, a variable frequency compressor still offers advantages in terms of startup, minor fluctuations, and future process changes.
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