Blower Motor Rib Notch for Moisture Discharge
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional blowers face issues with moisture, such as rainwater and evaporator detergent, infiltrating into the motor rib and causing corrosion due to the difficulty in discharging moisture from the inner peripheral space back to the scroll chamber, especially in low-pressure regions where flow velocity is high.
Innovation Solution
The blower design includes a motor rib with a notch portion positioned near a high-pressure region in the scroll chamber, allowing moisture infiltrating into the inner peripheral space to be effectively discharged back to the scroll chamber using ventilation air with lower flow velocity, preventing corrosion of motor components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the notch portion is formed in the low-pressure region of the scroll chamber, then moisture can be discharged from the inner peripheral space of the motor rib, but ventilation air and moisture easily infiltrate into the inner peripheral space through the notch portion
Solution Approach 1:
The patent changes the location parameter of the notch portion from the low-pressure region to the high-pressure region in the scroll chamber. This parameter change exploits the pressure differential to achieve dual functionality: the high-pressure region location prevents moisture infiltration while still allowing moisture discharge through the notch portion, thereby resolving the technical contradiction between moisture discharge capability and moisture infiltration prevention
2Ease of operation
If the notch portion is formed in the low-pressure region, then moisture can communicate between inner and outer peripheral spaces, but it is difficult for infiltrated moisture to be discharged back to the scroll chamber
Solution Approach 1:
The patent changes the positional parameter of the notch portion to the high-pressure region, which creates a favorable pressure gradient for moisture discharge. The high-pressure region location ensures that moisture can be effectively pushed out of the inner peripheral space and back into the scroll chamber, improving moisture removal effectiveness while maintaining the discharge path functionality
3Productivity
If ventilation air flows through the scroll chamber at high velocity in the low-pressure region, then air circulation is efficient, but moisture infiltrates into the motor rib along with the ventilation air
Solution Approach 1:
The patent applies local quality by differentiating the functional characteristics of different regions in the scroll chamber. The high-pressure region where the notch portion is located has different flow characteristics compared to the low-pressure region. This local differentiation allows the notch portion to be positioned in a region where moisture infiltration is minimized while still maintaining overall air circulation efficiency
Solution Approach 2:
The patent changes the location parameter of the notch portion to the high-pressure region, exploiting the pressure and flow velocity differences between regions. This parameter change allows the system to maintain high air flow efficiency in the low-pressure region while preventing moisture infiltration at the notch portion location in the high-pressure region
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 design ensures that moisture is efficiently discharged from the motor rib to the scroll chamber, preventing motor component corrosion and maintaining the motor's integrity.
Implementation Method 1
a fan having a plurality of blades arranged around a rotary shaft of the motor, and a main shroud transferring rotational driving force generated by the motor to the blades while connecting the blades, the fan drawing air from one side in an axial direction so that the air is blown radially outward from the fan
Implementation Method 2
The motor rib includes a notch portion, through which an inner peripheral space and an outer peripheral space of the motor rib communicate with each other, at a portion approaching a high-pressure region in the scroll chamber
Data Source
AI summary
A motor casing is provided with a motor rib which is annularly formed along a circumferential direction of a fan while protruding toward a main shroud, and the motor rib is provided with a notch portion in a portion near a high-pressure region in a scroll chamber. A part of moisture flowing into the scroll chamber infiltrates into an inner peripheral space of the motor rib across the motor rib in a low-pressure region in which a flow velocity of ventilation air is high in the scroll chamber. However, the moisture is pressed to the notch portion by ventilation air infiltrating into the inner peripheral space of the motor rib from the low-pressure region in the scroll chamber, and is then discharged to the scroll chamber from the notch portion.