An Analysis of the Influence of the Discharge Pressure in the Compressor Section on the Working Processes and Characteristics of a Piston Hybrid Power Machine with a Stepped Slot Seal

The development and research of piston hybrid displacement machines is a pressing scientific task due to demanding power and economic characteristics of such machines compared to individual piston compressors and pumps. The efficiency of a piston hybrid displacement machine can be increased by using slot seals that have different hydraulic resistances when the fluid flows from the pump cavity to the compressor cavity and back. The stepped slot seal is one of the most effective seals, which have a high ratio of fluid discharge in the forward and reverse direction per cycle. The discharge pressure in the compressor section is a major operational parameter of such machines. The conducted experimental studies have shown that using the stepped slot seal, instead of a flat one, increases the efficiency of piston hybrid displacement machines. It has been theoretically established that the compressor section operates most efficiently in the 0.4 – 1.0 MPa range of the discharge pressure in the compressor section. At the same time, the discharge pressure of the compressor section has virtually no impact on the efficiency of the pump section.

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