Control method and heating equipment

By detecting the real-time air pressure of the gas furnace exhaust fan and using a PID algorithm to control the motor speed, the problem of unstable air volume regulation under different load conditions of the gas furnace was solved, thus improving energy efficiency and safety.

CN121898015APending Publication Date: 2026-04-21GD MIDEA HEATING & VENTILATING EQUIP CO LTD +1
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Patent Information

Application Number
CN202411471389.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-10-21
Publication Date
2026-04-21

AI Technical Summary

Technical Problem

The existing gas-fired boiler's AC exhaust fan operates at a high speed under low load conditions, resulting in a short residence time of high-temperature flue gas, greater heat loss, and a decrease in overall energy efficiency. Furthermore, the air volume regulation is unstable under both high and low load conditions.

Method used

By detecting the real-time air pressure inside the exhaust fan, the motor speed is controlled using a PID algorithm to maintain the air pressure within a preset range, thereby achieving a stable output of air volume. It also adapts to changes in the length of the flue and external air pressure, and uses a DC motor to reduce the impact of grid voltage.

Benefits of technology

It improves the overall energy efficiency of the gas furnace, ensures sufficient oxygen supply under high load conditions, and ensures sufficient heat exchange between high-temperature flue gas and the indoor environment under low load conditions, thus avoiding safety risks caused by abnormal flue gas exhaust.

✦ Generated by Eureka AI based on patent content.
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Abstract

The invention discloses a control method and heating equipment, the control method is applied to the heating equipment for heating through a combustor, the heating equipment comprises a smoke exhaust fan, the smoke exhaust fan comprises a fan assembly, and the fan assembly comprises a motor and an impeller arranged on the motor; the control method comprises the steps that the fan assembly is controlled to be started at the initial rotating speed, and initial air pressure is formed in the smoke exhaust fan; initial wind pressure is detected; if the initial wind pressure is greater than or equal to the protection wind pressure, controlling the motor to increase the rotating speed until the real-time wind pressure reaches a fixed preset range; and controlling the motor to maintain the real-time wind pressure to run at the rotating speed within the preset range. The rotating speed of the motor is continuously corrected by feeding back the real-time air pressure, and the air pressure in the smoke exhaust fan is kept within the preset range, so that the actual air volume of the smoke exhaust fan is kept stable, the requirement for the content of oxygen supplied to a combustor in the high-load state can be met, sufficient heat exchange between high-temperature smoke and the indoor environment in the low-load state can be guaranteed, and the energy consumption is reduced. And the overall energy efficiency of heating equipment is improved.
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