Dongfeng 4987914 integrated piston 4987914 Dongfeng Cummins engine piston L Denon accessories

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compressor mainly by the body, crankshaft connecting rod, cylinder piston, suction and exhaust valve, etc.. />  (1): the low pressure gaseous refrigerant compression process after compression into high pressure gas. Called the compression process. When the piston moves to the lower end point (that is, the piston can not move down the position), the cylinder is filled with low pressure gaseous refrigerant, the piston begins to move upward along the cylinder, when the suction valve is closed, the cylinder content product is gradually reduced. In a closed cylinder. Gaseous refrigerant is compressed, the pressure and temperature will gradually increase. When the pressure reaches the exhaust pressure, the exhaust valve opens automatically to exhaust
(2) exhaust process: start gaseous refrigerant discharged from the exhaust valve in the compression process, at the end, continue to move the piston, cylinder gas pressure is no longer increasing, and continuously exhaust. Until the piston movement to reach the endpoint of the piston can no longer upward position) at the end of the exhaust process.
(3) expansion process: when the piston reaches the endpoint after moving downward along the cylinder, the exhaust valve is automatically closed, the remaining amount of high pressure gaseous refrigerant in the clearance volume, pressure drop volume called expansion process. />  /-->