US 9,957,971 B2Granted

Method for preventing a fan from burning down at activation

AssigneeAsia Vital Components Co., Ltd.

InventorsQing-Wu Hu, Dong-Qi Tian, Bao-Lin Yao

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Abstract

A method for preventing a fan from burning down includes steps of: using a central processing unit (CPU) to detect rotational speed of forward operation of a fan and defining as a highest backward rotational speed value; using the CPU to detect operation direction and rotational speed of backward operation of the fan; and using the CPU to activate the fan to operate forward or activate a rotation stop control signal to stop the fan when the fan impeller rotates forward or backward by return air, if the rotational speed of the rotation stop control signal is smaller or larger than the highest backward rotational speed value, the CPU activating the fan to operate forward or making the fan to generate a warning signal and keeping providing the rotation stop control signal. The method can prevent the fan from burning down and enhance the stability.

Claims9

Dependent claims

A method for preventing a fan from burning down at activation, comprising steps of:

using a central processing unit to detect rotational speed of forward operation of a fan impeller of the fan and defining the rotational speed as a highest backward rotational speed value;
using the central processing unit to detect operation direction of the fan impeller of the fan and rotational speed of backward operation of the fan impeller;
using the central processing unit to activate the fan impeller to operate forward when the fan impeller is blown and moved by return air to rotate forward;
and
using the central processing unit to activate a rotation stop control signal to stop the fan impeller when the fan impeller is blown and moved by the return air to rotate backward, if the rotational speed of the rotation stop control signal is smaller than the highest backward rotational speed value, the central processing unit activating the fan to operate forward, if the rotational speed of the rotation stop control signal is larger than the highest backward rotational speed value, the central processing unit making the fan generate a warning signal and keeping providing the rotation stop control signal.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/698,802Filed 28 Apr 2015
Published: US 2016/0319827 A13 Nov 2016
Granted: 1 May 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

F04D 27/008
Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids: stop safety or alarm devices,…
F04D 27/004
Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids: by varying driving speed
F05D 2260/85
Function: starting
Y02B 30/70
Energy efficient heating, ventilation or air conditioning [HVAC]: efficient control or regulation technologies, e.g. for control of refrigerant…