Control Method of Multiple Parallel Fume Hoods

Abstract

The invention relates to a method for controlling a plurality of parallel fume hoods. A plurality of parallel fume hoods, an air exhaust main pipe device and an air feed main pipe device are used. Each fume hood comprises a body, a sliding window type door, a body control circuit, a door openness detection circuit, an air feed inlet pipe joint and an air exhaust outlet pipe joint; the air exhaust main pipe device comprises an exhaust fan, an air exhaust main pipe, a variable-frequency governor and a PLC (Programmable Logic Controller) A; the air feed main pipe device comprises a blower, an air feed main pipe, a variable-frequency governor and a PLC B; a stroke sensor in the door openness detection circuit is used for acquiring the height data of door opening; the air exhaust main pipe device is used for controlling the air exhaust amount of the fume hood according to the acquired height data; the air feed main pipe device is used for controlling the air feed amount of the fume hood according to the data of the air exhaust amount; and the body control circuit is used for controlling an electric adjust valve to adjust the actual face velocity of the door of the fume hood and ensuring the actual face velocity to be consistent with a preset target face velocity.

Description

technical field [0001] The invention relates to a control method for multiple parallel fume hoods. The method uses a plurality of parallel air supply type fume hoods, an exhaust main pipe device, and a supplementary air main pipe device; the sliding window of the air supply type fume hood is collected in real time by a stroke sensor According to the height data of the open cabinet door, the PLC programmable controller A in the exhaust main pipe device calculates the target exhaust air volume according to the height data; the PLC programmable controller A sends a control signal to control the speed of the exhaust fan to reduce the actual exhaust air total Adjust the volume to the target total amount of exhaust air; the PLC programmable controller B in the supplementary air main device sends a control signal in real time according to the data of the target total exhaust air volume to control the speed of the blower to adjust the actual total supplementary air volume. Background...

AI Technical Summary

Problems solved by technology

However, this supplementary air type fume hood cannot achieve the purpose of multiple fume hoods simultaneously exhausting and supplementing air, and its exhaust air volume and supplementary air volume cannot be automatically adjusted, resulting in high energy consumption and low wind speed in this supplementary air type fume hood. uneven problem

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