Sterilizers are important equipment for protecting human life and health. Developed countries such as household sterilizers and commercial sterilizers are popular.
Whether the sterilization of the sterilizer is qualified depends largely on whether the control system is reliable. For the practical problems of unstable control system and unfriendly human-machine interface of a medical equipment factory, the author uses 80C196KB single-chip microcomputer to design sterilization control for the plant. The system eliminates the defects of the original system and adds some functions accordingly. Compared with the 51 series single-chip microcomputer, the 96 series has more on-chip resources and the design system is relatively easy.
1 sterilizer control analysis
The sterilizer mainly sterilizes five kinds of packages, instruments, latex, liquids and other types, and the processes are substantially the same, and the differences can be controlled by programs. According to the principle of operation (Fig. 1), it is known that various operation controls are performed depending on whether the temperature and pressure of the inner and outer pots reach a predetermined value.
A total of 4 analog input: external pot temperature TW, outer pot pressure PW, inner pot temperature TL, inner pot pressure PL; control output a total of 16: outer pot inlet valve switch IW, outer pot exhaust valve switch OW, Inlet steam inlet valve switch IL, inner pot exhaust valve switch OL, vacuum valve switch ZK, dry air valve switch GZ, oil pump relay on and off YB, vacuum pump relay on and off ZB, electromagnetic hydraulic valve (high pressure valve GF, rack valve CF, door latch valve MF), signal indication (power indication PowerL, total power indication PowerZ, fault indication ERR, buzzer alarm ALarm).
Figure 1 Working principle
It can be seen from the above figure that the main body of the sterilizer is a high-pressure container with a jacket and a sealing door, and is equipped with a vacuum pump, a vacuum valve, a steam valve and the like, and a temperature and pressure sensor. The working process is shown in FIG. 2 .
2 control system hardware structure
The hardware structure of the control system is shown in Figure 3 below:
Figure 3 control system hardware structure
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