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Mini Air Compressor MP-58D

Model: MP-58D
Automatic Type
Preset 0.5MPa on/ 0.7MPa off
Airflow: 5 litres per minute
Max Pressure: 5 atm
Weight: 2.3 kg
Air Tank Receiver:
Operating Noise: 51dB
Comes with

Mini Air Compressor MP-56D

Model: MP-56D
Automatic Type
Preset 0.5MPa on/ 0.7MPa off
Airflow: 2 litres per minute
Max Pressure: 5 atm
Weight: 2.3 kg
Size: 102(W)x205(H)x173(D)mm
Air Tank Receiver : 0.3 litre
Operating Noise: 48dB

Vacuum Pump VP-56B

Model: VP-56B
Automatic Type
Preset 60KPa on/ 75KPa off
Suction flow: 6.8 litres per minute
Weight: 2.3 kg
Size: 102(W)x205(H)x173(D)mm
Air Tank Receiver: 0.3 litre
Operating Noise: 48dB

Additional Reserve Air Tank

Model: TU-56W
Volume: 1.2 litres

Tutorial on the Operation of the Basic Air Compressor

An air compressor delivers 10m³/min f.a.d. at 7 bar pressure. The circuit requires 7³/min f.a.d. at allowable fluctuations of delivery pressures from 7 to 6 bar pressure. The air tank receiver has capacity of 4³.

Determine the number of times the compressor comes in load per hour. Assume fully cooled temperature constant and atmosphere pressure is 1 bar pressure.

Calculation

First, we find the free air stored within the air tank receiver:
At 7 bar pressure: P₁V₁/T₁ = P₂V₂/T₂
                              1*V₁/T₁ = (7+1)*4/T₂
                    ==>  V₁ = 32m³
At 6 bar pressure: 1*V₃/T₃ = (6+1)*4/T₄
                    ==>  V₃ = 28m³
Therefore, the different in free air volume stored in the air tank receiver between 6 and 6 bar pressure is 4m³.
The air compressor will come on load when the receiver pressure drops to 6 bar and go off load when it reaches 7 bar.

As the compressor delivers 10m³ and the circuit requires 7m³, this leaves 3m³ to charge the receiver.
Thus, the charge time = 4m³/(3m³/min) = 1.33min
Discharge time = air available from receiver / air required per minute by the system = 4m³/(7m³/min) = 0.57min
Thus, the total time between compressor going on load = 1.33+0.57 = 1.9 min

This means that the compressor starts 60/1.9 or 31.6 times per hour.

Reducing the Number of Starts by Adding Reserve Tank to Increase Receiver Volume

If the air tank receiver is increased to 6m³ by adding reserve tank, what is the cycle time instead?

Charge time = 6m³/(3m³/min) = 2min
Discharge time = 6m³/(7m³/min) = 0.86min
Thus, the total time between compressor going on load = 2.86 min

The cycle time can be increased by either increasing the capacity of the air receiver or increasing the range of the pressure over which the system can fluctuate.