commercial refrigeration The automatic adjustment process of refrigeration room

The automatic adjustment process of commercial refrigeration refrigeration room is: the temperature change in the refrigeration room is detected by the platinum thermal resistance, and the temperature change is converted into the corresponding electrical signal It is sent to the regulator; the regulator compares the transmitted signal with the set value through the comparison element, and converts the difference between the two into a control signal according to a predetermined regulation rule and sends it to the solenoid valve; the solenoid valve then according to the control signal The size is turned on or off, so as to realize the automatic adjustment and control of the storage temperature by adjusting the flow of refrigerant into the evaporator.

Classification of automatic adjustment control systems There are many types of automatic adjustment control systems, and the main types are as follows.

1) According to the change rule of set value classification (1) fixed value control system. Features: The set value of the adjusted parameter of the adjustment object remains unchanged or does not exceed the specified range of change during the control process. For example, the temperature control of commercial refrigeration cold storage room. (2) Program control system. Features: The set value of the adjusted parameter of the adjustment object changes according to the set law, that is, the set value of the adjusted parameter is a function of other parameters. For example, the energy adjustment of commercial refrigeration compressor is carried out according to the change of commercial refrigeration evaporation temperature. (3) Follow-up control system. Features: The set value of the adjusted parameter of the adjustment object changes with the change of the system state. Generally used in the energy-saving operation of the system. 2) Classified according to the relationship between control action and time (1) Continuous control system. Features: All parameters change with time. (2) Intermittent control system. Features: A system where more than one parameter is a switch value. If the solenoid valve controls the liquid supply of the evaporator, there are only two control modes: on or off, and no other control situations will occur.

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