| Pressing-off inlet valve is one of the methods of air-regulating for reciprocating compressor, and it possesses economic , safe and well-fixing character. Taking the method of pressing-off inlet valve as the theory foundation, a new stepless capacity control system based hydraulic device is developed, whose hardcore is hydraulic distributor. The system depends on the manipulation of the distributor to change the duration of pressing-off inlet valve, thus to conduct the varying capacity, which can avoid useless work and save the energy.The article analyses the working principle of such a system. Combined with the fluid theory in valve channel and theoretical calculation of the hydraulic pressing-off force, the concrete machine structure and control system can be decided. Through the experiment, the real regulation effect can be observed.Through this research task, the following topics can be obtained:1. Combined with the fluid theory in valve channel, the theoretical calculation of the hydraulic pressing-off force has been deduced, and the valve has been simulated in computer, which validates the feasibility and rationality of the hydraulic stepless capacity control system(HSCCS).2. The experiment test platform based Lab View has been designed.3. The principle for HSCCS has been thoroughly studied, and the integrated HSCCS structure has been established.4. The elemental experiment of HSCCS has been accomplished. The results indicate: the duration of the hydraulic force maintaining can be continuously regulated, and the duration of the valve's pressing-off varies accordingly.
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