Research On Theory Of Pulse Jet On-off Valve And Application In BCP

Pulse jet device is the performing unit in industrial package, biochemical analysis, electrical package and other businesses, which can jet fluid with micro flux. But the present jet devices cannot fulfill the demand of large-flux, high-speed and stable in some applications. In this dissertation, we designed an on-off pulse jet device, combined the advantage of high-speed on-off valve and pulse jet device. The design method of this jet device is set up, based on the systemic property research of the device. The analysis model of pulse jet on-off valve actuated by GMA is built for the big character printer (BCP) ; the property regulation of the device is disserted by simulation. These works can offer important guidance for the design of this type of pulse jet device.In the first chapter, the advantages and shortages of different jet methods and the possible applications were discussed; then a new design method was put forward, combined the advantages of high-speed on-off valve and pulse jet device; the development history and the research situation of high-speed on-off valves were analyzed; and the source of the project and the main contents of the research were pointed outIn the second chapter, the character of on-off valve and the structure of nozzle were combined, and a new pulse jet device - pulse jet on-off valve was designed. The design method of pulse jet on-off valve was built up based on the systemic discuss of on-off valve properties. These works offer the academic guidance for the on-off valve design and development.In the third chapter, the application background and working theory of BCP was analyzed briefly; a character matrix structure and the control method for industry environment application were put forward. The factors affected the on-off valve jet effect were systemic discussed; and the on-off valve working in the BCP was designed; the actuator was made certain as GMA.In the fourth chapter, the dynamic model of pulse jet on-off valve based on GMA was built up. The effect of different factors on the on-off valve dynamic properties were simulated; development regulation of the valve properties and the measures for improve were also studied, which provide a valuable reference for the on-off valve property improvement.In the fifth chapter, the structure of GMA in the on-off valve was designed and optimized based on the dynamic property simulation results of the valve and the...