Energy-saving control system and control method for screw type electric air compressor set

Abstract

The invention discloses an energy-saving control system for a screw type electric air compressor set. The energy-saving control system comprises a main control machine and multiple driven machines. The main control machine comprises a first screw electric air compressor, a frequency converter connected with the first screw electric air compressor, a first controller connected with the frequency converter and a first air pressure sensor, wherein the first air pressure sensor is connected with a high-pressure air conveying pipeline and used for transmitting detected pipeline air pressure data to the first controller. Each driven machine comprises a second screw electric air compressor, a power frequency controller connected with the second screw electric air compressor and a second air pressure sensor, wherein the second air pressure sensor is connected with the high-pressure air conveying pipeline and used for transmitting detected pipeline air pressure data to the power frequency controller. The power frequency controller is connected with the first controller. The first controller acquires the pressure values detected by the first air pressure sensor and the second air pressure sensor, and the frequency converter is controlled and the frequency of the motor and start and stop of the driven machines are controlled according to the set PID control. The energy-saving control system has the beneficial effects that energy saving is achieved, and the start is skipped to automatically when a failure happens.

Description

technical field [0001] The invention relates to the field of air compressor control systems. More specifically, the present invention relates to an energy-saving control system for a screw electric air compressor unit. Background technique [0002] The air compressor is the main body of the air source device. It is a device that converts the mechanical energy of the prime mover (usually a motor) into gas pressure energy, and is a pressure generating device for compressing air. As one of the main industrial products, the air compressor is an indispensable equipment in every factory. [0003] Old-fashioned air compressors are operated manually. When high-pressure air is not needed, they can only be turned into no-load functions to reduce energy waste. They cannot be automatically turned on and off, joint control cannot be implemented, and they do not have functions such as frequency conversion and protection. , the control method is relatively single, therefore, there is a l...

AI Technical Summary

Problems solved by technology

[0003] Old-fashioned air compressors are operated manually. When high-pressure air is not needed, they can only be turned into no-load functions to reduce energy waste. They cannot be automatically turned on and off, joint control cannot be implemented, and they do not have functions such as frequency conversion and protection. , the control method is relatively simple, therefore, there is a large amount of waste of electric energy

The traditional electric air compressor is started and shut down manually. When the construction site does not need excess air volume, the air compressor will turn into an empty power load state (the power in the empty state is 30% to 50% of the load power) ; ① When the air compressor is not needed on the construction site, if the shutdown is not notified or the driver makes a mistake in the work, the air compressor is always in the running state; ② When one air compressor cannot meet the requirements, start the second one When the air compressor is running, one of the air compressors is in a load state, and the other is always in a state of switching between load and no load, causing mechanical damage and waste of electrical energy

[0004] The new energy-saving air compressors on the market in the past one or two years have the function of automatically shutting down when no-load is too long, but they do not have the function of automatically opening. Compared with the electric air compressor energy-saving technology control system developed by our company, it saves low energy efficiency

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