Outdoor Fan Vane Locking and Wind Compensation for Start-Up
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Solution Overview
Problem
Air-conditioner outdoor units in monsoon climates face issues with fan start-up failures due to wind-induced rotation during shutdown, leading to 'fan out-of-step protection' and subsequent failure to regulate indoor air conditions.
Innovation Solution
The air-conditioner outdoor unit incorporates a vane stopping device with an elastic sheet and electromagnetic conducting sheet to prevent passive rotation of vanes, coupled with a wind speed measuring device to detect and compensate the fan's start-up frequency, ensuring successful start-up even in high winds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fan is left stationary during shutdown state, then the structure is simple and energy-saving, but the fan cannot start up successfully when wind speed exceeds a certain threshold
Solution Approach 1:
The vane stopping device is activated before the fan start-up process to prevent the fan blades from rotating due to external wind. By preemptively securing the fan blades in a stationary position, the system eliminates the risk of wind-induced rotation that would cause start-up failure, thereby improving reliability without requiring complex control systems during the actual start-up phase.
Solution Approach 2:
The vane stopping device acts as an intermediary mechanism between the external wind environment and the fan system. It mediates the harmful effect of wind by providing a mechanical barrier that prevents wind from directly rotating the fan blades, thus protecting the fan start-up process from external disturbances while maintaining system simplicity.
2Reliability
If the fan starts up with compensated frequency, then the start-up success rate improves, but the control system becomes more complex
Solution Approach 1:
The control system incorporates wind speed detection feedback to dynamically adjust the fan start-up frequency. By continuously monitoring wind conditions and compensating the start-up frequency accordingly, the system ensures optimal start-up performance across varying wind conditions, significantly improving start-up success rate while maintaining manageable control complexity through automated feedback loops.
3Reliability
If the vane stopping device is activated, then passive rotation is prevented, but the device complexity increases
Solution Approach 1:
The vane stopping device is designed to automatically activate and deactivate based on system state without requiring complex external control. The device serves itself by utilizing the system's operational status to trigger appropriate actions, thereby preventing passive rotation while minimizing the need for additional control mechanisms and reducing overall device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution significantly improves the start-up success rate of the fan by compensating the rotational speed, ensuring normal air-conditioner operation and preventing fan failures caused by wind interference.
Implementation Method 1
the elastic sheet and the electromagnetic conducting sheet are configured to generate a repulsive force when being supplied with currents in the same direction, so as to push the elastic sheet to abut against the vane to prevent the vane from passively rotating
Data Source
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AI summary
The present invention discloses an air-conditioner outdoor unit and a control method for a fan (100) of the air-conditioner outdoor unit. The air-conditioner outdoor unit of the present invention comprises a fan (100) and a deflector ring (200) that is sleeved on the outside of a vane (110) of the fan (100), and further comprises a vane stopping device (300), a wind speed measuring device (400), and a control system. The vane stopping device (300) disposed on the deflector ring (200) is connected to the control system, which may cause a vane (110) that is passively rotating to stop rotating; the wind speed measuring device (400) is connected to the control system and is used for detecting the wind speed flowing through the vane (110), the wind speed comprising a wind speed value and a wind speed direction, the control system controls the vane stopping device (300) to start and shut down according to the wind speed that is detected by the wind speed measuring device (400), and controls actual start-up frequency of the fan (100) according to the wind speed that is detected by the wind speed measuring device (400). The air-conditioner outdoor unit and the control method for the fan (100) of the air-conditioner outdoor unit may compensate the rotational speed of the fan (100), and ensure the start-up success rate of the fan (100).