Control system for electronic expansion valve in central air conditioner

Abstract

The invention discloses a control system for an electronic expansion valve in a central air conditioner.A compressor of the central air conditioner comprises an exhaust end and a suction end, the central air conditioner is provided with a condenser and an evaporator, and the electronic expansion valve is connected between the condenser and the evaporator.The control system for the electronic expansion valve in the central air conditioner comprises a PLC, a temperature sensor used for collecting temperature information and connected to the PLC through an RTD module signal, a pressure sensor used for collecting pressure information and connected to the PLC through an AI module signal and a man-machine interaction module in signal connection with the PLC; the PLC is sequentially connected to the electronic expansion valve through a DO pulse module and a motor drive signal.The control system has the advantages of being wide in adaptive range and facilitating integral control.

Description

technical field [0001] The invention relates to the technical field of control systems, in particular to a control system for an electronic expansion valve in a central air conditioner. Background technique [0002] Most of the throttling devices in central air-conditioning systems use electronic expansion valves. The electronic expansion valve is installed between the condenser and the evaporator. The high-pressure and normal-temperature refrigerant liquid from the condenser flows through the electronic expansion valve to complete isenthalpic expansion and throttling and pressure reduction. At the same time, it also controls the liquid supply flowing into the evaporator. To adapt to load changes, and then ensure the stable, energy-saving and efficient operation of the air conditioning system. Obviously, whether the electronic expansion valve can be accurately and stably controlled is the key to the stable and efficient operation of the entire central air-conditioning syste...

AI Technical Summary

Problems solved by technology

[0004] However, with the wide application of central air-conditioning systems, different fields and industries have different requirements for central air-conditioning systems and higher and higher requirements for automatic control. A certain logic is compiled and solidified in the controller, and the control program cannot be improved according to the actual needs of the system

In addition, the electronic expansion valve controller will also have repeated collection of temperature and pressure, resulting in waste of resources, which is not conducive to the overall control of the system

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