Intelligent control system of air-cooled screw air compressor

Abstract

The invention relates to an intelligent control system of an air-cooled screw air compressor, which is connected with an air compressor system and a user centralized control system, and comprises a PLC programmable logic controller, a fan frequency converter, a temperature sensor, a pressure sensor and a touch screen. The temperature sensor and the pressure sensor are connected with four paths of analog quantity input modules through shielded cables, and then are connected with a CPU central control unit. The PLC is connected with the four paths of the analog quantity input module; the first path of the analog quantity input module is connected with the fan frequency converter through a shielded cable; the frequency converter is connected with a fan motor of the air compressor system; the second and third paths of the analog quantity input modules are respectively connected with a compressor unit protective device; and the four path of the analog quantity input module is connected a compressor motor. The intelligent control system realizes the functions of settable user pressure control, PID closed-loop control of a cooling fan, switching of manual and automatic control functions, setting of control parameters on a display screen, displaying of measurement parameters and alarm parameters on the display screen, communication meeting standard communication protocol requirements, and the like.

Description

technical field [0001] The invention relates to an intelligent control system of a screw compressor, in particular to an intelligent automatic control system of an air-cooled screw air compressor intelligent control system with a programmable control (PLC) and a human-machine interface (HMI). Background technique [0002] Due to the wide application of compressed air in the industrial field, the air compressor has become an indispensable key equipment in the flow process of the industrial sector. It can not only supply the air at the required pressure for the instrument and automation equipment, but also supply the separation equipment with its required pressure. The required raw material air; at the same time, the air compressor is still a high energy consumption equipment, and its power consumption can reach about 15% of my country's total power generation. With the advent of the global energy crisis, governments all over the world are actively promoting energy-saving techn...

AI Technical Summary

Problems solved by technology

In order to avoid failure alarm shutdown due to high exhaust temperature in summer in the south, the cooler and cooling fan are often configured relatively large, and the fan only has two states of on and off, and the output power cannot be adjusted according to the actual exhaust temperature, which is wasteful In addition, air compressors basically use traditional dedicated controllers. The measurement and control points of this controller are very limited, and it is impossible to incorporate all the detailed measurement and control points in the process of motors and air compressors into the control system. The compressor system brings many hidden dangers of failure, which increases the possibility of downtime due to failure, and also brings many unstable factors to the user's gas consumption, such as economic losses due to insufficient gas supply

[0004] In addition, the traditional controller program is solidified, and the hardware production is completely consistent with its solidified software, resulting in a large number of hardware and software versions, and it is impossible to add control functions according to user requirements, which brings a lot of inconvenience to the design of the control system. This can only be done by adding lines. The complexity of the control system to meet part of the control requirements will seriously increase the failure probability of the line part of the control system during operation, which will bring a lot of inconvenience to maintenance

[0005] Based on the above technologies and control methods, the traditional air compressor control system for the air compressor unit in a severe cold environment, the cooler exposed to the atmosphere for a long time is overcooled, the viscosity of the lubricating oil is too high, and the oil in the cooler when the unit starts The lubricating oil is not easy to flow, so that the oil injection volume of the machine head is too low, and the unit is loaded after the startup is completed, causing the machine head to alarm and stop due to high temperature

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