Operational monitoring method for movable blade adjustable type axial flow fan

Abstract

The invention discloses an operational monitoring method for a movable blade adjustable type axial flow fan. The method comprises the following steps that a, an EPLD device detects the pulse frequencyoutput by the movable blade adjustable type axial flow fan; b, a central processing unit judges whether the pulse frequency value is zero or not; c, if the pulse frequency value is zero, the movableblade adjustable type axial flow fan is judged to stop rotating; d, if the pulse frequency value is not zero, the detected pulse frequency is compared with a set threshold value; e, if the comparisonresult is that the rotating speed of the movable blade adjustable type axial flow fan is decreased, the abnormal rotating speed of the movable blade adjustable type axial flow fan is continuously counted, and after the number of times exceeds a set threshold value, the operation of the movable blade adjustable type axial flow fan is controlled by a movable blade adjustable type axial flow fan control circuit; f, a temperature sensor detects the temperature of gas output by the movable blade adjustable type axial flow fan; and g, the central processing unit judges whether the detected temperature is higher than a preset threshold value, and if the detected temperature is higher than the preset threshold value, a fault alarm is started.

Description

technical field [0001] The invention relates to the technical field of axial flow fans, in particular to an operation monitoring method of an axial flow fan with adjustable moving blades. Background technique [0002] There are two forms of adjustable axial fan blades, adjustable stationary blades and adjustable moving blades. Adjustable static blade means static adjustment of blade angle after the fan stops running; adjustable movable blade means dynamic adjustment of blade angle during fan operation. [0003] Axial flow fans with adjustable movable blades are usually used in occasions with high flow requirements and low pressure requirements. When the fan is used for a long time, the temperature of the power source of the fan will be too high. If it is not dissipated in time, it will Damage to the power source motor on the fan seriously affects the normal use of the fan. The traditional cooling device of the fan is to expand the heat dissipation holes on the motor itself,...

AI Technical Summary

Problems solved by technology

[0003] Axial flow fans with adjustable movable blades are usually used in occasions with high flow requirements and low pressure requirements. When the fan is used for a long time, the temperature of the power source of the fan will be too high. If it is not dissipated in time, it will Damage to the power source motor on the fan seriously affects the normal use of the fan. The traditional cooling device of the fan is to expand the heat dissipation holes on the motor itself, or increase the volume of the motor body, thereby increasing the heat dissipation area of ​​the motor. However, the heat generated by the motor It is still on the motor itself, so the heat dissipation effect is not good. In order to ensure the operation reliability of the adjustable blade axial flow fan, it is necessary to detect various states of the adjustable blade axial flow fan

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