Pistons on a refrigeration compressor
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A single acting refrigeration reciprocating compressor has six pistons pitched 100mm from each other on the shaft. The pair cranks on VW formation are positioned on 120 degrees apart from each other on the shaft and compression- suction sequence is in the order of 1-6, 2-5, and 3-4. Calculate the out of balance torque when the shaft rotates at 1450rpm if the mass of each piston is 350g. Take the central plane of the shaft as reference.
What is the difference in torque when the compression-suction order is 1-4, 5-2, and 3-6 and explain why removing mass is better than adding a counter balance mass.
Also take crank radius as being 200mm
Show workings and calculations (simple drawing attached)
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Solution Summary
Pistons on a refrigeration compressors are examined. The out of balance torque when the shaft rotates at 1450rpm if the mass of each piston is 350g is determined.
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A single acting refrigeration reciprocating compressor has six pistons pitched 100mm from each other on the shaft. The pair cranks on VW formation are positioned on 120 degrees apart from each other on the shaft and compression- suction sequence is in the order of 1-6, 2-5, and 3-4. Calculate the out of balance torque when the shaft rotates at 1450rpm if the mass of each piston is 350g. Take the central plane of the shaft as reference.
What is the difference in torque when the compression-suction order is 1-4, 5-2, and 3-6 and explain why removing mass is better than adding a counter balance mass.
Also take crank radius as being 200mm
Show workings and calculations (simple drawing attached)
Given
Mass of each piston =350 g
Each piston is 100mm apart.
The reference plane is in the center.
Treating the side to left of the reference plane as negative and right of plane as positive
The distance of plane 1 from the reference plane is = - 250mm
The distance of plane 2 from the reference plane is = - 150mm
The distance of plane 3 from the reference plane is = - 50mm
The distance of plane 4 from the reference plane is = 50mm
The distance of plane 5 from the reference plane is= 150mm
The distance of plane 6 from the reference plane is = 250mm
Treat the radius of piston as they are all equal treat them as r ...
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