Abstract
A reciprocating compressor is a volumetric machine. Consequently, the motion of gas in communications always is of non-stationary or pulsating character. The diagram of oscillatory processes in communications is complex because a number of factors affect the nature of the flow: cyclical gas supply, valve dynamics, change in the flow area of pipelines, variable cylinder volume, variable piston velocity, temperature gradients, etc. The analysis of non-stationary processes in the suction stage of a household refrigeration compressor is considered. A mathematical model of the flow of real gas in the suction system of a household refrigeration piston compressor has been developed. We performed a calculation study of the motion diagram of the suction valve, gas velocities in the suction pipe and pressure changes in the suction chamber. The results of a reciprocating compressor study while compressing various gases are given. The influence of the properties of refrigerants on the operation of the compressor and the suction system is considered.
Highlights
Reciprocating compressors (RC) belong to the class of volumetric machines
The results show a change in the performance indicators of the reciprocating compressor, depending on the piston clearance
It is known that the leakage of a reciprocating compressor is determined by the static leakiness of the seals, and by the dynamic leakage of the valves associated with their untimely closing
Summary
Reciprocating compressors (RC) belong to the class of volumetric machines. The transition to ozone-friendly refrigerants, (in particular, the transition from R12 to R134A for household refrigeration compressors) is of great interest for RC researchers [1, 2]. Given the small size of such a compressor and the large number of household refrigerators produced in the world, the problem seems to be quite serious. It is necessary to take into account that such replacement results in the increased ratio of pressures in the cylinder, and, as result the efficiency and other performance characteristics of the compressor reduce. The operations of valves change, and the discharge temperature increases. The change in suction and discharge pressures entails a change in the dynamics of the valves and their efficiency and strength characteristics. To maintain the cooling capacity of the units, it is necessary to increase the volumetric capacity of the compressor. All of the aforesaid can be achieved by changing the designs of the compressor units, which is extremely undesirable for most manufacturers
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