Outdoor Unit Heater Shield Layout to Prevent Freezing
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Solution Overview
Problem
Existing outdoor units for air-conditioning apparatuses face reduced work efficiency due to high-temperature components and potential freezing of internal members from cool air ingress, which requires careful handling and increases maintenance challenges.
Innovation Solution
An outdoor unit design featuring a casing with a bottom panel, an outdoor fan, a heater, a heater guard, and a shield portion thermally connected to the heater guard, where the shield portion is positioned downstream in the airflow direction and upstream of the heater guard, preventing cool air from freezing internal members and reducing the risk of high-temperature exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a wall portion or isolating plate is provided to cover the heater, then the heater is protected from direct contact, but the wall portion itself becomes a high-temperature component that workers must avoid, reducing work efficiency
Solution Approach 1:
The patent introduces a shield portion as an intermediary component positioned between the opening and the heater guard. This shield portion intercepts cool air before it reaches the heater guard, preventing the heater guard from becoming a high-temperature component that workers must avoid. The shield portion itself remains at lower temperature due to its position upstream in the airflow path, thus maintaining worker safety while improving work efficiency.
2Object-affected harmful factors
If the heater guard is positioned to face the heater for protection, then the heater is protected, but cool air can still blow against other members and freeze them
Solution Approach 1:
The patent divides the protection function into two separate components: the shield portion and the heater guard. The shield portion is positioned upstream to intercept cool air and protect downstream components from freezing, while the heater guard maintains its function of protecting the heater. This segmentation allows each component to specialize in one protective function, solving both the heater exposure protection and freezing prevention problems simultaneously.
Solution Approach 2:
The patent adds a new spatial dimension to the protection system by positioning the shield portion at a different location in the airflow path (upstream) compared to the heater guard (downstream). This dimensional change in positioning allows the system to address multiple protective needs - the shield portion handles freezing prevention by intercepting cool air early, while the heater guard handles heater protection, thereby resolving the contradiction between heater exposure protection and freezing prevention.
3Strength
If fixing members are used to hold the heater, then the heater is secured, but the fixing members become high-temperature components requiring careful handling during maintenance
Solution Approach 1:
The shield portion acts as a thermal mediator that intercepts cool air before it reaches the heater and fixing members. By positioning the shield portion upstream in the airflow path, it creates a thermal barrier that prevents the fixing members from becoming high-temperature components. This allows workers to handle the fixing members during maintenance without excessive heat exposure, improving ease of operation while maintaining the heater fixation strength.
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 configuration enhances work efficiency by minimizing the risk of freezing internal components and reducing the need for cautious handling, as the shield portion is less susceptible to heat and frost, thereby improving maintenance efficiency.
Implementation Method 1
a shield portion thermally connected to the heater guard
Data Source
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AI summary
[Object] To provide an outdoor unit for an air-conditioning apparatus that exhibits higher work efficiency than that provided in the known art and in which members provided in a casing thereof are prevented from being frozen. [Solution] An outdoor unit 100 for an air-conditioning apparatus includes a casing 10 including a bottom panel 10c having an opening 10c1, an outdoor fan 3 provided in the casing 10, a heater 4 provided on the bottom panel 10c, a heater guard 5 provided to face the heater 4, and a shield portion 6 thermally connected to the heater guard 5. The shield portion 6 is positioned on a downstream side with respect to the opening 10c1 in a direction of airflow and on an upstream side with respect to an end in the upstream side 5a21 of the heater guard 5 in the direction of airflow.