1 HP Belt Driven Piston

Difference between screw machine and piston machine

In this article, we will tell you the main differences between screw compressors and piston refrigeration compressors. It is mainly discussed from the two dimensions of principle and structure:

         First of all, screw compressors and piston compressors are the same in that both are positive displacement refrigeration compressors, but screw compressors are new high-speed refrigeration compressors.

         First, similarities and differences between screw and piston machines

1. Similarities: In principle, the similarities between piston compressors and screw compressors are that both compress the gas through the change in volume;

         2. Difference: The two methods in volume change are completely different. The piston machine mainly changes the working volume of the cylinder through the movement of the crankshaft connecting rod, while the screw compressor causes the easy change by the rotation change of the rotor;

         Second, the difference between the overall structure of screw compressors and piston compressors

         1. In terms of construction, piston compressors have vulnerable parts such as cylinders, pistons, piston rings, cylinder liners, etc., but screw compressors do not. The structure of the piston compressor is very compact, small in size, light in weight and has no clearance volume. There is basically no risk of liquid strike when only a small amount of liquid enters the machine. And the piston valve can be used to achieve stepless energy adjustment between 10% and 99%. At the same time, it also has the advantages of wide application range, stable and reliable operation and so on. Its maintenance period is relatively long, and the barrier-free running time can reach (2-5) * 104h. Because the use of lubricating oil can make the machine's cooling use and sealing performance greatly improved. The exhaust temperature is reduced, and single-stage operation is possible even at low evaporation temperatures or high compression. Therefore, within a certain range, it can replace the two-stage compression cycle;

         2. Because the precision of screw compressor processing and assembly is very high, it is not suitable for variable operating conditions. And its noise is relatively large, so if the place where noise is required should be equipped with noise reduction and sound insulation, and it must be sprayed with lubricant during refrigeration compression, it is necessary to configure the oil pump and oil cooler and oil recovery And other equipment.

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