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Gear coupling transmission of compressor

Publisher: Ever-Power Mechanical Equipment
2016-04-26

Compressor gearCouplingtransmission

  gearCouplingThe transmission also has the function of transmitting power and changing the speed. The gear transmission itself also needs to consume a certain amount of energy, but it is more efficient than the belt transmission.Gear transmission requires additional bearings, and there are higher requirements for the lubrication system of the machine.Because the gears of screw compressors are high-speed and heavy-duty gears, they have high requirements for processing and materials, and high production costs.
        Gear transmission has two main points: product modification is easier; secondly, there are no consumables and wearing parts in the transmission link of gear transmission compressor.
  In the gear compressor, there is a more special transmission mode, which is a direct drive compressor with a speed-increasing gear inside.The external coupling is used to transmit power, and the internal gear is used to change the speed.
 
  The direct drive of the compressor is compared with the belt drive above, and it can be found that the direct drive and the belt drive have their own advantages and disadvantages.We compare the gear compressor and the belt compressor from various aspects.
  a. Efficiency
  Good gear transmission efficiency can reach 98-99, and good belt transmission design can reach 99 efficiency under normal conditions.The difference between the two does not depend on the choice of transmission mode, but depends on the manufacturer's design and manufacturing level.However, it is easier to maintain high transmission efficiency in gear mode, while belt transmission is more difficult, with an average efficiency of 94-98.
  b. No-load energy consumption
  For direct gear transmission, the no-load pressure is generally maintained above 2.5bar, and some even as high as 4bar to ensure the lubrication of the gearbox.
  For the belt drive mode, theoretically speaking, the no-load pressure can be zero, because the oil sucked in by the rotor is sufficient to lubricate the rotor and the bearing.Generally, the pressure is maintained at about 0.5 bar.
  c. oil loss
  In the case of oil loss, the gearbox will be the first to suffer.The belt drive system has no such problem at all.
  d. Design pressure according to user requirements
  Generally, the pressure required by the user is not completely consistent with the pressure of the manufacturer's standard model.The belt drive design manufacturer can design the pressure to be exactly the same as the user's requirement by simply changing the diameter of the pulley, so that the user can obtain more air volume with the same power motor.For gear transmission, it is not so convenient.
  e. Pressure change of installed compressor
  Sometimes the design pressure of the original compressor may be too high or too low due to the change of the user’s production process conditions. It is hoped that it can be changed. However, for a gear-driven compressor, it will be very difficult and expensive. For belt-driven compressors, But it is a breeze for the type compressor, only need to replace the pulley.
  f. Install new bearings
  When the rotor bearing needs to be replaced, for the gear-driven compressor, the gearbox and the gearbox spindle bearing need to be overhauled at the same time, and the cost is unacceptable for users.For belt-driven compressors, this problem does not exist.
  g. Replace the shaft seal
  Screw compressors all use an annular shaft seal, which needs to be replaced after a certain life.For gear-driven compressors, the motor and coupling must be separated before the shaft seal can be approached, which makes this work time-consuming and laborious and increases maintenance costs.For belt-driven compressors, just remove the pulley, which is much easier.
  h. Motor or rotor bearing damage
  For gear-driven compressors, when the motor or rotor bearing is damaged, it will often damage the connected important parts, causing direct and indirect double damage.This situation does not exist for belt-driven compressors.
        summary
  For the three coupling transmission modes of the compressor: direct coupling, belt and gear, in principle, the efficiency is the same, but due to different models, different production technologies, different materials, different working conditions, and different maintenance will cause Efficiency varies greatly, so it is meaningless to only focus on the debate on the technology itself. Everything must be built on the basis of the "people" of the application.