Blower Motor Cooling Chamber Water Drainage
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Solution Overview
Problem
Existing blower devices for vehicular air-conditioning systems are not effective in reliably preventing water droplets from reaching the motor, which can be detrimental to its operation.
Innovation Solution
A blower device with a casing that includes an air intake port, a flow path, and a motor cooling unit featuring a chamber with an inclined ceiling surface that directs water droplets away from the motor cooling duct opening, ensuring they do not enter and reach the motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a step portion is formed at the air intake port to prevent water intrusion, then water drop intrusion is partially prevented, but water collection is insufficient and reliability is not adequately improved
Solution Approach 1:
The ceiling portion of the chamber is designed with an inclined surface (curved or sloped geometry) that causes water drops to roll or flow downward along the inclination toward the discharge port, preventing them from reaching the motor through the duct
Solution Approach 2:
The inclined ceiling surface converts the harmful effect of water drops (which would otherwise enter the motor) into a beneficial drainage function, where gravity causes water to naturally flow toward the discharge port away from the motor
2Object-affected harmful factors
If the chamber volume is increased to collect more water, then water collection improves, but device complexity and space requirements increase
Solution Approach 1:
The chamber serves multiple functions: it cools the motor by providing cooling air flow while simultaneously collecting and draining water drops through the inclined ceiling, eliminating the need for separate water collection structures
Solution Approach 2:
The cooling air flow path and water drainage function are merged into a single chamber structure, where the inclined ceiling serves both the cooling air passage and as a water drainage surface
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 effectively prevents water droplets from entering the motor cooling unit and reaching the motor, enhancing the reliability of the blower device and vehicular air-conditioning system by ensuring the motor remains dry and operational.
Implementation Method 1
a ceiling portion of the chamber (51) having an inclined surface (59) that is inclined downward from above... an inclined surface of the ceiling portion lets the water drop flow downward from above along an inclination direction of the inclined surface
Implementation Method 2
a scroll fan (22) that takes the air into a center portion of the scroll fan from an air intake port formed in the casing by means of the scroll fan rotationally driven by the motor. The intake air is blown by the rotating scroll fan toward a radially outer portion thereof
Implementation Method 3
a duct (52) having an opening portion that opens into the chamber and supplying, to the motor, the air in the chamber taken in through the opening portion
Data Source
AI summary
A blower device and a vehicular air-conditioning device including a chamber for air flow so as to cool a motor, whereby water drops are prevented from reaching the motor with higher reliability. Included is a casing having an air intake port, an air discharge port, and a discharge flow path portion communicating between the air intake port and the air discharge port; a scroll fan provided in the casing to take in the air from the air intake port and generate an air flow to the air discharge port through the discharge flow path portion; a motor rotationally driving the scroll fan; and a motor cooling unit cooling the motor. The motor cooling unit includes a chamber for partial air flow from the discharge flow path portion and a cooling duct having an opening portion which opens into the chamber at one end and supplying air to the motor.