| With the continuous development of society,disinfection operations have become an indispensable and important part of social production and life.Therefore,disinfection cabinets have been increasingly used in production and life.Because the needs of various industries for disinfection operations are not exactly the same,many different methods of disinfection have been used,and the corresponding categories of disinfection cabinets have also become more and more abundant.With the continuous improvement of the level of science and technology,the scientific and technological content of certain disinfection operations has become higher and higher.For example,intelligent tools embedded with control chips,special devices using new materials,etc.We collectively refer to these types of operating objects as sensitive devices.This situation puts forward new requirements for disinfection operations,and the use of existing general sterilizers on the market to handle the disinfection of sensitive equipment is often cumbersome and difficult to ensure the disinfection effect.It is against this background that a medical device company has developed a new VHP sensitive device-specific sterilizing cabinet that uses hydrogen peroxide vapor(VHP)micro-condensation technology as the main technical feature.This kind of special disinfection device has special requirements on the work flow and working parameters,especially the temperature of the sterilization chamber.Therefore,this paper takes the control system of this special VHP sterilizer as the research object,and designs the control system of sterilizing cabinet according to the actual operation flow and the control requirements of the specific working parameters.During this process,the disinfection cabinet sterilizing was studied emphatically.The temperature control of the warehouse developed a temperature control module for the sterilization chamber.(1)Study the work process of the VHP sterilizer and establish a detailed control process to analyze the specific control requirements based on this.Then,hardware selection and software programming are used to establish a sterilizer control system based on the control process and requirements.(2)An approximate mathematical model for the temperature change process of the sterilizer is established by specific analysis of the operating characteristics of the retort and the temperature change process.(3)The Smith-Fuzzy PID control algorithm was designed by analyzing the specific indicators of the temperature control of the sterilization chamber and the characteristics of the temperature change and combining the mathematical model of the temperature change.(4)Design software and hardware of temperature control system of sterilization chamber,mainly including selection of temperature sensor,design of zero-crossing detection interruption circuit,design of thyristor drive circuit,design of chip circuit and transmission circuit,and design of embedded temperature control software.(5)Test the achievement of temperature control indicators through experiments,and improve the temperature control of the sterilizer according to the specific problems in the experiment. |
