Air-conditioner outdoor unit and control method for fan of air-conditioner outdoor unit
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Solution Overview
Problem
Air-conditioner outdoor units in monsoon climate areas face issues with fan start-up failures due to wind-driven rotation during shutdown, leading to 'fan out-of-step protection' and subsequent failure to regulate indoor air conditions.
Innovation Solution
An air-conditioner outdoor unit with a vane stopping device and wind speed measuring device, which prevents passive rotation of the fan vane and adjusts the start-up frequency based on detected wind speed, ensuring successful start-up by compensating the rotational speed.
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 passive rotation caused by external wind. By preemptively securing the vane in a neutral position, the system ensures that the fan motor starts from a known static state, eliminating the risk of out-of-step protection triggered by unexpected initial rotation.
Solution Approach 2:
The elastic sheet acts as an intermediary mechanical element between the driving member and the fan vane. It transmits the stopping force while allowing for controlled deformation, providing a smooth and reliable connection that prevents direct mechanical冲击 between the driving member and vane during the stopping process.
2Reliability
If the fan starts at specified frequency without compensation, then the control is simple, but the fan cannot overcome the hindrance caused by wind-driven rotation
Solution Approach 1:
The control system continuously monitors the actual operating frequency of the fan during start-up and compares it with the specified target frequency. When a deviation is detected (indicating out-of-step condition), the system automatically adjusts the start-up frequency in real-time to match the actual rotational state, ensuring successful motor-vane synchronization.
Solution Approach 2:
The system dynamically adjusts the start-up frequency parameter based on the detected rotational state of the fan. By changing the frequency parameter from the originally specified value to a compensated value that accounts for wind-driven rotation, the motor can effectively synchronize with the vane and overcome the hindrance caused by external wind forces.
3Reliability
If the vane stopping device is always activated, then the fan start-up reliability is improved, but the device cannot respond to different wind conditions
Solution Approach 1:
The vane stopping device transitions from a static always-activated state to a dynamic conditional activation state. The control system activates the stopping device only when wind speed exceeds a predetermined threshold, allowing the system to adapt its behavior based on real-time environmental conditions. This dynamic approach maintains high start-up reliability while avoiding unnecessary activation in calm conditions.
Solution Approach 2:
The wind speed measuring device automatically detects external wind conditions and provides feedback to the control system. The system self-regulates by activating or deactivating the vane stopping device based on the measured wind speed, eliminating the need for manual intervention or fixed configuration and enabling automatic adaptation to varying wind environments.
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
The solution significantly improves the start-up success rate of the fan, ensuring normal air-conditioner operation by preventing fan rotation during shutdown and compensating the start-up frequency according to wind speed and direction.
Implementation Method 1
two electromagnetic conducting sheets are respectively disposed at the two ends of the elastic sheet and opposite to the pushing portions; when the elastic sheet and the electromagnetic conducting sheets are supplied with currents in the same direction, the pushing portions at the two ends are pushed by the repulsive force to approach to each other
Data Source
AI summary
An air-conditioner outdoor unit and a control method for a fan (100) of an 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); further comprised are a vane stopping device (300), a wind speed measuring device (400), and a control system. The vane stopping device (300) is disposed on the deflector ring (200), is connected to the control system, and 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).