2D4 (D22) -2.9/47-51 Reciprocating Piston Process Air Compressor API618

Definition and Classification

1. Rolling Piston Type D Compressors (such as DSKOOL DC compressors)
   • Structure: Composed of a rolling piston, cylinder block, slide plate, and eccentric shaft. It creates a crescent - shaped working chamber between the rolling piston and the cylinder wall to carry out the processes of suction, compression, and exhaust.
   • Characteristics: These compressors are compact, lightweight, energy - efficient, and operate quietly. They are well - suited for micro - scale refrigeration systems, like portable cooling devices and electronic cooling systems.
   • Applications: They are used in mobile thermal management scenarios, including medical imaging, food cooling, and vehicle power supplies.
2. Large - Scale Piston Type D Compressors (such as the Kaiyi D - series)
   • Structure: They feature a multi - stage compression design, with a piston force of up to 8 tons. These compressors are suitable for handling high - pressure gases, such as natural gas and nitrogen.
   • Characteristics: They can work within a high - pressure range of 15 - 400 bar and have a large flow rate of 0.5 - 100 m³/min. They can support continuous operation or high - frequency load switching.
   • Applications: They are used in process flows such as petrochemical engineering, natural gas recovery, and industrial gas compression.

Technical Features

• Operating Modes:
  • Miniature D - type compressors mostly use brushless motors with frequency conversion control, enabling them to adapt to environments with low to high backpressure (0.05 - 1.5 MPa).
  • Large - scale D - type compressors are usually water - cooled and can achieve oil - free or micro - oil lubrication, meeting the requirements of harsh working conditions.
• Efficiency and Reliability:
  • Optimized profiling, like a barrel - shaped skirt, helps reduce frictional losses and enhance energy efficiency.
  • High - temperature - resistant materials, such as aluminum alloy with steel inserts, and cooling technologies, such as built - in cooling coils, are used to deal with high - temperature and high - pressure environments.

Typical Application Scenarios

1. Miniature D - type Compressors:
   • These are used in portable cooling equipment, mini - refrigerators, and cooling systems for electronic components.
2. Large - scale D - type Compressors:
   • They are employed in natural gas pressurization, industrial gas separation, and petrochemical projects, such as ethylene and polypropylene production.

Leading Brands and Models

• DSKOOL: It offers miniature DC compressors, with its representative product being the smallest refrigeration compressor in the world.
• Kaiyi Special Compressors: The D - series (such as the 8 - ton piston - force model) serves key national projects.
• BOGE: It manufactures piston compressors, like the P2L model, which is known for its modular design and high durability.