Cylinder Head Valve Plate Inlet and outlet valves Crank case Crank shaft Connecting rods Piston Oil return path Discussion: Define stroke, bore, clearance volume and displacement volume of the compressor. The distance travelled by the piston from bottom dead centre (BDC) to top dead centre (TDC) within the cylinder is known as the stroke of the compressor. The bore is the diameter of the compressor cylinder. The volume between the piston and the cylinder head when it is at its minimum, i.e. when the piston is at the position of Inner Dead Centre is called the clearance volume. The volume of the compressor may be defined as the volume swept by the piston in its stroke between the bottom and the top dead centres respectively. Do the piston have a taper? While mounting the ring the sharp edge should be on the top or the bottom? Yes, the piston have a taper. While mounting, the sharp edge should be on the bottom. In which direction should the piston rings scrap the lubricating oil? If more than one piston ring is used what precautions should be used? The lubricating oil should be scrapped towards the by the piston rings. Care should be taken while mounting of multiple piston rings. The piston-ring which is to be farthest from the cylinder-head should be mounted first and so on. What are the methods used for capacity control of compressors? and Off Control”, the Valves Open” ,”Hot Gas Bypass” and Multiple Units” are some of “On “Holding the control methods used. What are the safety devices used with refrigerant compressors? Some of the safety devices used are as follows: 1. Low suction pressure cut-off devices
Cylinder Head Valve Plate Inlet and outlet valves Crank case Crank shaft Connecting rods Piston Oil return path Discussion: Define stroke, bore, clearance volume and displacement volume of the compressor. The distance travelled by the piston from bottom dead centre (BDC) to top dead centre (TDC) within the cylinder is known as the stroke of the compressor. The bore is the diameter of the compressor cylinder. The volume between the piston and the cylinder head when it is at its minimum, i.e. when the piston is at the position of Inner Dead Centre is called the clearance volume. The volume of the compressor may be defined as the volume swept by the piston in its stroke between the bottom and the top dead centres respectively. Do the piston have a taper? While mounting the ring the sharp edge should be on the top or the bottom? Yes, the piston have a taper. While mounting, the sharp edge should be on the bottom. In which direction should the piston rings scrap the lubricating oil? If more than one piston ring is used what precautions should be used? The lubricating oil should be scrapped towards the by the piston rings. Care should be taken while mounting of multiple piston rings. The piston-ring which is to be farthest from the cylinder-head should be mounted first and so on. What are the methods used for capacity control of compressors? “On and Off Control”, “Holding the Valves Open” ,”Hot Gas Bypass” and Multiple Units” are some of the control methods used. What are the safety devices used with refrigerant compressors? Some of the safety devices used are as follows: 1. Low suction pressure cut-off devices