Air conditioner, device and method for cold air prevention during heating for air conditioner
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Solution Overview
Problem
Existing air conditioner systems struggle to accurately prevent cold air during heating, especially under low load conditions, leading to inefficient heating, potential system overpressure, and safety hazards, without intelligent control of the blower fan and air deflector.
Innovation Solution
A device and method that detect indoor and outdoor ambient temperatures to determine specific temperature ranges, integrating evaporator inner-tube temperature, compressor operating time, and current intensity to control the blower fan speed and air deflector position, optimizing cold air prevention timing and ensuring comfortable heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the blower fan is delayed to prevent cold air blowing, then cold air prevention is improved, but the indoor side high pressure rises faster and the system cannot accurately determine the load
Solution Approach 1:
The patent implements feedback control by continuously monitoring the evaporator inner-tube temperature and using it to dynamically adjust the blower fan start timing. The temperature detecting element provides real-time feedback on the evaporator temperature, and the controlling element adjusts the fan operation accordingly, creating a closed-loop control system that accurately responds to actual system conditions rather than relying on fixed delays
Solution Approach 2:
The patent replaces the conventional mechanical delay timer-based fan control with an intelligent control system that uses temperature sensing and microprocessor-based decision logic. Instead of relying on predetermined time delays, the system substitutes a sensor-based measurement and control algorithm that can accurately determine system load and optimize fan operation based on real-time evaporator temperature conditions
2Object-affected harmful factors
If the blower fan is not started to prevent cold air, then cold air prevention is improved, but the indoor side high pressure rises faster causing safety hazards
Solution Approach 1:
The controlling element continuously monitors evaporator inner-tube temperature and uses this feedback to determine the optimal moment to start the blower fan. This closed-loop control prevents excessive pressure buildup by ensuring the fan starts at the appropriate time based on actual temperature conditions, thereby maintaining system safety while still preventing cold air blowing
Solution Approach 2:
The system performs preliminary temperature monitoring and preparation before starting the blower fan. The temperature detecting element continuously measures the evaporator inner-tube temperature in advance, and the controlling element prepares to activate the fan at the optimal moment, ensuring that the fan starts neither too early nor too late, thus preventing both cold air blowing and pressure-related safety hazards
3Ease of operation
If fixed temperature condition is used for cold air prevention, then control simplicity is improved, but the optimal comfort experience cannot be met under varying load conditions
Solution Approach 1:
The patent transforms the static, fixed-temperature control approach into a dynamic control system that continuously monitors evaporator inner-tube temperature and adjusts blower fan operation in real-time. The controlling element dynamically determines fan start timing based on the current temperature condition, enabling the system to adapt to varying load conditions while maintaining simple operation through automated control
Solution Approach 2:
The system changes the control parameter from a fixed temperature threshold to a dynamic temperature-based decision criterion. Instead of using a single predetermined temperature value, the controlling element evaluates the actual evaporator inner-tube temperature condition and adjusts fan operation accordingly, allowing the system to adapt to different load conditions while maintaining ease of operation through intelligent automation
Data Source
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AI summary
An air conditioner, and a device and method for preventing cold air during heating of the air conditioner are provided. The method includes: after heating is started, detecting an indoor ambient temperature and an outdoor ambient temperature respectively to determine a general temperature range within which the indoor ambient temperature and the outdoor ambient temperature are located (S110); determining whether an evaporator inner-tube temperature satisfies an evaporator inner-tube temperature condition required for entering a cold air prevention mode, or determining whether a duration, for which a compressor and a four-way valve operate, reaches an operating duration required for entering the cold air prevention mode, or determining whether a current intensity continuously reaches a first preset current intensity threshold for a predetermined duration (S120); when any one of determining results is yes, starting an inner blower fan at a first preset wind speed (S130); determining whether the evaporator inner-tube temperature satisfies the evaporator inner-tube temperature condition required for exiting the cold air prevention mode, or determining whether the current intensity continuously reaches a second preset current intensity threshold for a predetermined duration, or determining whether a duration, for which the inner blower fan operates at the first preset wind speed, reaches a first preset duration (S140); and if so, switching the inner blower fan to operate at a second preset wind speed (S150).