Vehicle Air Conditioner Rotational Number Controlling Device Cooling
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Solution Overview
Problem
In center concentrated-type vehicle air conditioners, the rotational number controlling device is not sufficiently cooled due to the bending of airflow from the external air introducing direction aligning with the blower's suction direction, leading to inadequate airflow in the vehicle interior side passage, which affects cooling regardless of the selected mixture ratio of internal and external air.
Innovation Solution
The rotational number controlling device is directly attached to the vehicle interior side wall surface of the intake box, and an air delivery guide is provided to direct a portion of the airflow intersecting with the blower's suction opening direction to the device, ensuring sufficient cooling in both internal and external air modes without disrupting airflow in the internal air circulation mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the rotational number controlling device is installed in the vehicle interior side passage of the intake box, then the device can be positioned for easy wiring attachment and maintenance, but the airflow resistance is higher and sufficient airflow cannot be secured to cool the device
Solution Approach 1:
The air delivery guide is designed to segment and redirect a portion of the external air airflow specifically toward the rotational number controlling device, separating the cooling airflow path from the main air intake path. This allows the device to receive dedicated cooling airflow even when installed in the vehicle interior side passage with higher airflow resistance.
Solution Approach 2:
The air delivery guide acts as an intermediary component that intercepts external air airflow and redirects it to the rotational number controlling device. This mediator ensures that the controlling device receives sufficient cooling airflow without requiring changes to the overall air intake system or installation location.
2Productivity
If the airflow from the external air introducing opening is bent to align with the blower's suction direction, then the airflow efficiency for the blower is improved, but the rotational number controlling device installed in the vehicle interior side passage is not sufficiently cooled
Solution Approach 1:
The air delivery guide creates a localized airflow path that delivers external air specifically to the rotational number controlling device region, while the main airflow continues to be bent efficiently toward the blower suction direction. This local quality modification ensures both overall airflow efficiency and local cooling of the controlling device.
Solution Approach 2:
The air delivery guide serves as an intermediary that diverts a portion of the external air flow to cool the rotational number controlling device without disrupting the main airflow path to the blower. This allows simultaneous optimization of both blower airflow efficiency and controlling device cooling.
3Reliability
If the air delivery guide is provided to deliver external air to the rotational number controlling device, then the cooling of the device is ensured, but the structure of the intake box becomes more complex
Solution Approach 1:
The air delivery guide is integrated with the existing internal/external air switching means, merging the cooling function with the existing air switching structure. This reduces the need for separate components and minimizes the increase in structural complexity while ensuring reliable cooling of the rotational number controlling device.
4Reliability
If the air delivery guide is provided on the internal/external air switching means, then the cooling airflow is delivered to the rotational number controlling device, but the guide may interfere with the switching operation
Solution Approach 1:
The air delivery guide is designed to deliver only a portion of the external air flow to the rotational number controlling device, while allowing the remaining airflow to continue to the blower. This partial action approach ensures sufficient cooling without excessive interference with the switching operation or main airflow path.
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 ensures the rotational number controlling device is effectively cooled regardless of the selected mixture ratio, maintaining airflow efficiency and reducing airflow resistance, thus ensuring reliable operation of the air conditioner.
Implementation Method 1
the rotational number controlling device generates heat
Implementation Method 2
an air delivery guide for delivering a part of air introduced from the direction intersecting with the opening direction of the suction opening of the blower to the rotational number controlling device
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3
AI summary
The present invention relates to a vehicle air conditioner, comprising at least: an intake box including an external air introducing opening, an internal air introducing opening and internal/external air switching means for controlling a mixture ratio of internal air and external air; a blower arranged downstream of the intake box for forming an airflow in a case; and a rotational number controlling device for controlling a rotational number of the blower, the vehicle air conditioner with an opening direction of a suction opening of the blower directed in a vehicle right-left direction and with an opening direction of the external air introducing opening directed in a direction intersecting with the opening direction of the suction opening of the blower, wherein the rotational number controlling device is attached to a vehicle interior side wall surface in the intake box, and an air delivery guide for delivering a part of air introduced from the direction intersecting with the opening direction of the suction opening of the blower to the rotational number controlling device is provided in the intake box.