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Aiming at the problem about the eefective control of thermal oil temperature and efficiency, based on the ordinary PID control algorithm and fuzzy control algorithm based on rule table were studied, the temperature control system of temperature acquisition module, temperature display module, sound and light alarm module, the heating module were improved, the working principle of temperature control system including the fuzzy control method, pulse modulation method were analyzed. A kind of based on 89C52 and Marine paint heat conduction oil temperature control based on fuzzy control system was put forward, Proteus simulation platform was used to construct the simplified model of the temperature control system, based on the ordinary PID algorithm and fuzzy control algorithm based on rule table are simulated respectively. The results indicate that, the fuzzy control algorithm based on rule table of heat conduction oil temperature control system performance is beeter, more efficient, has the good rffect of the temperature control, the system can occur at temperatures of abnormal sound and light alarm and command system to stop working, and can meet the needs of actual production and proceesing. [ABSTRACT FROM AUTHOR]

Aiming at studying the inner flow under maximum operating conditions, a centrifugal pump was simulated by adopting RNGK-S turbulence model. Hydraulic performance was predicted and the calculation results were compared with the experiment results. Fluid velocity, pressure distribution and external characteristics were analyzed under 4 operating conditions. The results indicate that pressure and velocity distribute uniformly under the optimum flow rates condition. At large flow rates point, the volute pressure decreases and the velocity distribution is not uniform. At the maximum flow rates point (1.7 Qopt), negative pressure appears at the inlet of the volute. Vortex of the velocity flow lines become larger and occurs reflux in the local position of diffusion tube. The study reveal pump inner flow rules, which provide reference to the high specific speed centrifugal pump optimal design and extenfings life under variable flow rates operation condition. [ABSTRACT FROM AUTHOR]