Classification and performance of gear oil, application of common problems and troubleshooting methods
Classification and performance of gear oil, application of common problems and troubleshooting methods
2022年3月21日
Adjustment of NSK Bearing Clearance
Adjustment of NSK Bearing Clearance
2022年3月21日

Classification, performance, application and troubleshooting of compressor oil

  • Compressor is a machine used to compress gas, increase gas pressure or transport gas. With the development of production technology, the types and structural forms of compressors are increasing day by day.Classification, performance, application and troubleshooting of compressor oil 
  • Nowadays, various types of compressors are widely used in petrochemical, machinery manufacturing, civil construction, mining and metallurgy, transportation, national defense, medical textile, food and other departments.Classification, performance, application and troubleshooting of compressor oil

Classification, performance, application and troubleshooting of compressor oil

  • Type, structure and purpose of compressor
  • The compressor is a general-purpose machine, which is mainly used for:
  • Compressed gas is used as a power source for a pneumatic mechanical tool driven by a compressor.Classification, performance, application and troubleshooting of compressor oil
  •  Compressed refrigerant (such as ammonia or Freon) is used for refrigeration breaing;
  • Compressed feed gas for synthesis and polymerization;Classification and performance of gear oil, application of common problems and troubleshooting methods
  •  Compressed gas, used for oil hydrofining;Classification and performance of gear oil, application of common problems and troubleshooting methods
  •  Used for gas transportation and bottling.Classification and performance of gear oil, application of common problems and troubleshooting methods
  • According to the different final exhaust pressure, it can be divided into
  • Low pressure compressor discharge pressure < 1MPa
  • Discharge pressure of medium pressure compressor: 1-10mpa
  • Discharge pressure of high-pressure compressor 10-100mpa
  • Discharge pressure of ultra-high pressure compressor > 100MPa
  • According to the amount of exhaust, it can be divided into
  • Discharge pressure of micro compressor < 3m3 / min
  • Discharge pressure of small compressor 3-10m3 / min
  • Discharge pressure of medium compressor 10-100m3 / min
  • Discharge pressure of large compressor > 100m3 / min
  • According to the shaft power, it can be divided into
  • Micro compressor power < 10kw
  • Small compressor power 10-100kw
  • Medium compressor power 100-500kw
  • Large compressor power > 500kW
  • According to different compressor media, it is divided into power compressor and process compressor.Classification, performance, application and troubleshooting of compressor oil
  • According to the different oil supply to the cylinder compression chamber, it is divided into oil storage lubrication compressor and oil-free lubrication compressor.Classification, performance, application and troubleshooting of compressor oil
  • According to the different ways of compressing gas, compressors can be divided into positive displacement type and speed type.Classification and performance of gear oil, application of common problems and troubleshooting methods.Classification, performance, application and troubleshooting of compressor oil

 Positive displacement compressor

  • The working volume is changed by the reciprocating or rotary rotor in the cylinder, so that the gas is compressed and the gas pressure is increased. Positive displacement compressors are divided into reciprocating and rotary.Classification, performance, application and troubleshooting of compressor oil
  • Reciprocating
  • The normal air forms of reciprocating compressor include piston type and diaphragm type. They are respectively through the reciprocating movement of piston diaphragm in the cylinder and automatically open and close with the help of inlet and exhaust valves to inhale, compress and discharge gas. Classification, performance, application and troubleshooting of compressor oil
  • It is characterized by wide pressure. In industrial application, the pressure is up to 350Mpa (3500kgf / cm2), which belongs to discontinuous gas transmission.Classification, performance, application and troubleshooting of compressor oil
  •  The gas pressure has pulse and vibration during operation. Among them, the piston compressor is widely used. The reciprocating compressor is divided into single-stage and multi-stage according to the compression process. Classification, performance, application and troubleshooting of compressor oil
  • According to the relative position of cylinder arrangement, it can be divided into vertical, horizontal, angular and opposed balance. Diaphragm compressor is a crank connecting rod mechanism, which drives the diaphragm through liquid. Classification, performance, application and troubleshooting of compressor oil
  • Due to the good air tightness of the membrane cavity, the cleanliness of the compressed medium is very high. Therefore, it is often used to compress precious and rare gases and transport non leaking, flammable, highly corrosive, radioactive and highly toxic media. Classification, performance, application and troubleshooting of compressor oil
  • Diaphragm compressor has a small gas transmission rate of 5-20m3 per hour, which is mostly used for special purposes of scientific research and production. Classification, performance, application and troubleshooting of compressor oil
  • The cylinder of the diaphragm compressor does not need lubrication, only needs to be lubricated by the handle connecting rod and the hydraulic cylinder.Classification and performance of gear oil, application of common problems and troubleshooting methods
  •  Rotary
  • This is a change in the working volume caused by the rotational movement of one or more rotors in the cylinder. The volumetric compressors that realize gas compression include sliding vane, screw, liquid ring and rotor. Among them, screw is widely used. Classification, performance, application and troubleshooting of compressor oil
  • Compared with reciprocating compressors, rotary compressors generally do not have reciprocating inertia force and force distance, so the rotating speed is high, its structure is simple, the rotation is stable, the reliability is high, at the same time, it has small volume, light weight, small air flow pulsation and few vulnerable parts, Therefore, there is a trend to replace the traditional piston compressor, but sliding vane compressor and screw compressor are widely used in rotary compressor.Classification, performance, application and troubleshooting of compressor oil
  •  Metal sliding plate and oil dripping lubrication are adopted. Classification and performance of gear oil, application of common problems and troubleshooting methods
  • This kind of compressor is simpler than piston type. However, due to the failure to solve the lubrication problem, the sliding plate has great friction and wear on the cylinder wall, which limits its development.Classification, performance, application and troubleshooting of compressor oil
  •  Later, oil injection internal cooling lubrication is adopted, which has been greatly improved, resulting in the decrease of compressed gas temperature, the increase of efficiency and the extension of service life, but it is only limited to medium and small gas volume. Classification and performance of gear oil, application of common problems and troubleshooting methods
  • For screw compressor, Because the two meshed rotors (male rotor with convex teeth and female rotor with concave groove) rotate at high speed in the shell, the volume formed by the rotor groove and the inner wall of the shell is continuously reduced to realize the compression of gas.Classification, performance, application and troubleshooting of compressor oil
Classification and performance of gear oil, application of common problems and troubleshooting methods
  • In this way, the lubricating oil is injected into the lubricating point of the cylinder at a certain speed with an oiler. The oil injector of small capacity compressor is driven by crankshaft, while the oil injector of large capacity compressor is often driven by motor alone. 
  • When adjusting pressurized oil injection, it must be increased by 75% according to the computer oil supply to overcome the back pressure of the cylinder. The advantage of large pressure oil injection is that it can always achieve reasonable lubrication of each friction surface with less oil. It is widely used in crosshead compressor and other large capacity high-pressure compressors.
  • External lubrication:
  • The motion mechanism of reciprocating compressor is mainly pressure lubrication, which is characterized by sufficient oil and sufficient lubrication, and can effectively remove friction debris. It can forcibly lubricate the large and small end bearings of main bearing connecting rod, which is widely used in all compressors.
Technical requirements for Timken non-standard bearing