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A DC fan control method and device

A DC fan and control method technology, applied in pump control, mechanical equipment, fluid heaters, etc., can solve problems such as inability to guarantee the air-fuel ratio, and achieve the effects of improving user experience, avoiding accidents, and eliminating errors

Active Publication Date: 2019-09-06
QINGDAO ECONOMIC & TECHN DEV ZONE HAIER WATER HEATER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The other part uses the DC fan as the air volume delivery unit of premixed gas heating and hot water equipment. By monitoring the input current or power of the fan and controlling the fan speed to achieve the purpose of airflow monitoring, although this control method can realize the resistance to changes in external wind pressure , but because the fan current and the adjustment of the fan speed are determined by human testing, there are human errors, and when the external resistance changes arbitrarily, it is impossible to ensure that the combustion air-fuel ratio is always kept within a reasonable range

Method used

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  • A DC fan control method and device
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Effect test

Embodiment 1

[0039] Such as figure 1 Shown is a flow chart of fan control in the embodiment of the present invention. The DC fan control method described in this embodiment is a method based on torque control. After setting a certain PWM value for the DC fan, in the case of changes in the objective working conditions of the gas equipment, by controlling the current of the fan, it can always ensure that the electromagnetic torque M of the fan is equal to the load torque Mfz. The fan speed V which changes inversely proportional to the change of the fan motor torque M is detected, and when the detected fan speed V is outside the preset range, the gas equipment is controlled to shut down safely. This method realizes intelligent resistance to changes in wind pressure, ensures that the air-fuel ratio is always kept within a reasonable range, and maintains high combustion efficiency of gas equipment.

[0040] Here, the control of the current of the fan is the intelligent adjustment of the equip...

Embodiment 2

[0053] Not shown in the figure, the DC fan control device described in this embodiment is applied to the DC fan control method described in Embodiment 1. The DC fan control device includes a detection module, a judgment module and a control module, wherein the detection module is connected to the judgment module, and the judgment module is connected to the control module.

[0054] The judgment module is loaded with a callable gas equipment working state function. The gas equipment working state function is determined with different input PWM values. When a certain PWM value is input to the device, the gas equipment working state function is also determined. , and set the preset area value for the fan speed V.

[0055] The detection module includes three detection units for detecting and saving the electromagnetic torque M of the fan, the load torque Mfz and the wind speed V of the DC fan respectively. The judging module includes a first judging module and a second judging mod...

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Abstract

The invention discloses a control method for a direct-current fan used for equipment using fuel gas. The method is characterized in that during operation of the equipment using fuel gas, the electromagnetic torque M of a fan is kept equal to load moment Mfz; additionally, the rotating speed of the fan is detected, wherein the rotating speed varies with the electromagnetic torque of the fan; and the equipment using fuel gas is controlled to shut down when the detected rotating speed of the fan is located outside a pre-set area. The invention discloses a control device applying the above-mentioned control method for the direct-current fan. The control device comprises a detection module, a judgment module and a control module. With the control method for the direct-current fan, air volume ofthe equipment remains unchanged when external resistance changes. Therefore, the air-fuel ratio is kept always within the proper range. By monitoring air speed V of the fan, a judgment is made as tothe current working state of the equipment using fuel gas. When the fan operates in an unreasonable manner, the equipment is controlled to be safely shut down. Therefore, wind pressure of the equipment using fuel gas is intelligently prevented from changing.

Description

technical field [0001] The invention belongs to the field of burner fan control, and in particular relates to a DC fan control method and device. Background technique [0002] When the gas heating and hot water equipment encounters the situation of high external wind pressure or blockage of the exhaust air duct during use, if the equipment is in the ignition process at this time, the gas heating and hot water equipment will fail to ignite or ignite and deflagrate. If it is in the normal combustion process, the gas heating equipment will go out or insufficient combustion air will cause insufficient combustion, so that the smoke exceeds the standard. The above-mentioned problems seriously affect the user experience and safety of use. [0003] Some premixed gas heating and hot water equipment products currently on the market use AC fans as the air volume delivery unit, and need to combine air pressure switches, Venturi structures, etc. to form an air flow monitoring device. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D27/00F24H9/20
Inventor 孟令建郑涛曹立国韩天雷靳德峰
Owner QINGDAO ECONOMIC & TECHN DEV ZONE HAIER WATER HEATER