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Variable-frequency controller of air compressor-refrigeration drier system

A frequency conversion control, air compressor technology, applied in the direction of electrical program control, sequence/logic controller program control, etc., can solve the problems of poor energy saving effect, poor air purification effect, high energy consumption, etc., to avoid waste, maintain Convenience and the effect of stable dew point temperature

Inactive Publication Date: 2012-07-25
ZHEJIANG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the deficiencies of high energy consumption, poor energy saving effect and poor air purification effect of the existing air compressor-cold dryer system, the present invention provides an air conditioning system that effectively reduces energy consumption and has good energy saving effect and air purification effect. Frequency conversion control device of air compressor - cold dryer system

Method used

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  • Variable-frequency controller of air compressor-refrigeration drier system
  • Variable-frequency controller of air compressor-refrigeration drier system
  • Variable-frequency controller of air compressor-refrigeration drier system

Examples

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Effect test

example 1

[0042] Set the standard pressure of the air compressor as P s =0.7MPa, the corresponding standard gas current value sent from the pressure transmitter is I g,s =11mA; set the standard dew point temperature of the cold dryer as T s =5°C (slightly better than the national standard level 5 (T,s =7mA. If the measured gas current value is 10mA, less than I g,s (11mA), indicating that the gas pressure at this time is too low and the load is too heavy; similarly, if the measured dew point temperature is 10°C (8mA), which is higher than the standard temperature T s (5°C), indicating that the cooling power at this time is insufficient and the load is too heavy. Among the above two factors, no matter which one is, the PLC can control the frequency converter to increase the frequency. If the gas pressure is too low, the frequency of the drive motor of the air compressor can be increased to increase the gas production volume and gas pressure until the standard pressure P s ; For the ...

example 2

[0044] Set the standard pressure of the air compressor as P s =0.7MPa, the corresponding standard gas current value sent from the pressure transmitter is I g,s =11mA; set the standard dew point temperature of the cold dryer as T s =5°C (slightly better than the national standard level 5 (T,s =7mA. If the measured gas current value is 11mA, and I g,s The same means that the gas pressure at this time is normal; similarly, if the measured dew point temperature is 5°C (7mA), which is the same as the standard temperature T s Same, indicating that the cooling power is normal. At this time, there is no need for PLC to do any action, and the inverter will run stably at the current frequency.

example 3

[0046] Set the standard pressure of the air compressor as P s =0.7MPa, the corresponding standard gas current value sent from the pressure transmitter is I g,s =11mA; set the standard dew point temperature of the cold dryer as T s =5°C (slightly better than the national standard level 5 (T,s =7mA. If the measured gas current value is 12mA, greater than I g,s (11mA), indicating that the gas pressure at this time is too high and the load is too light; similarly, if the measured dew point temperature is 0°C (6mA), which is lower than the standard temperature T s (5°C), indicating that the cooling power at this time is too large and the load is too light. If the gas pressure is too high, reduce the frequency of the drive motor of the air compressor, so that the gas production volume and gas pressure will be reduced until the standard pressure P s ; For the cold dryer, the operating frequency of the refrigeration compressor can be reduced, so that the power of the compressor is...

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Abstract

The invention provides a variable-frequency controller of an air compressor-refrigeration drier system, comprising a refrigeration compressor frequency converter, an air compressor frequency converter, a dew point temperature sensor, a pressure transducer and an energy-saving controller, wherein the dew point temperature sensor is used for detecting a cold medium temperature of the refrigeration drier; the pressure transducer is used for detecting the pressure of the air compressor; and the energy-saving controller is used for performing variable-frequency control to the compressor according to the dew point temperature and performing variable-frequency control to the air compressor according to the pressure. The refrigeration compressor frequency converter is connected with the refrigeration compressor of the refrigeration drier; the air compressor frequency converter is connected with a driving motor of the air compressor; the dew point temperature sensor and the pressure transducerare connected with the energy-saving controller; and the energy-saving controller is connected with the refrigeration compressor frequency converter and the air compressor frequency converter. The variable-frequency controller can effectively reduce the energy consumption and has good energy-saving effect and purification effect of the compressed air.

Description

technical field [0001] The invention relates to the field of air compressor-dryer, in particular to an air compressor-cold dryer system. Background technique [0002] Compressed air is the most important industrial power source besides electricity, and it is widely used in machinery, electronics, petrochemical, automobile, textile, chemical fiber, non-ferrous metal, electric power, coal, food, medicine and other fields. Since the compressed air output by the air compressor (hereinafter referred to as the air compressor) inevitably contains oil, water, steam and dust particles, etc., if no purification treatment is performed, the subsequent gas-consuming equipment and pipelines will be corroded and the quality of the gas will be reduced. Inferior, ultimately seriously affect the quality of the product. Therefore, it is necessary to dewater, degrease, dry and purify the compressed air. The refrigerated compressed air dryer (hereinafter referred to as the cold dryer) is the m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/05
Inventor 程成
Owner ZHEJIANG UNIV OF TECH