Cross Fan Engine Room Blower for Uniform Air Distribution
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Solution Overview
Problem
Conventional axial engine room blowers face issues such as dead zones in air flow, non-uniform air distribution, motor stalling due to foreign materials, and constraints in heat radiation performance due to the combination of a squared fan shroud with a circular axial cooling fan.
Innovation Solution
A cross fan engine room blower with multiple cross fans in a multi-stage arrangement, featuring impeller-shaped blades and a spur gear system to rotate cross fans, which reduces power consumption and maximizes air flow rate, while minimizing the introduction of foreign materials and improving air flow quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an axial cooling fan is used in a conventional axial engine room blower, then the motor can directly rotate the fan, but dead zones are created at the corners of the heat sink and air flow distribution becomes non-uniform
Solution Approach 1:
The single axial fan is segmented into multiple cross fans arranged in a matrix pattern. Each cross fan has four blades extending in perpendicular directions, dividing the heat sink surface into multiple zones. This segmentation eliminates dead zones at corners and ensures uniform air flow distribution across the entire heat sink surface.
Solution Approach 2:
The invention transitions from a single-direction axial fan to multi-directional cross fans. The blades extend not only in the axial direction but also in radial directions perpendicular to the rotation axis, creating a three-dimensional air flow pattern that covers the entire heat sink surface uniformly, including corner areas.
2Object-affected harmful factors
If the fan shroud is positioned close to the axial cooling fan to reduce noise, then noise is reduced, but foreign materials are more likely to be introduced into the narrow gap causing motor stalling
Solution Approach 1:
A protective cap is installed on the motor shaft before operation begins. This preliminary protective measure prevents foreign materials from entering the motor and causing stalling, while the fan shroud can be positioned close to the fan for noise reduction without compromising reliability.
3Temperature
If the outer diameter of the axial circular fan is increased to improve heat radiation performance, then heat radiation improves, but constraints in the squared heat sink are increased
Solution Approach 1:
Instead of increasing the diameter of a single large fan, the invention segments the cooling function into multiple smaller cross fans arranged in a matrix. This segmentation allows the fan assembly to fit within the squared heat sink constraints while collectively covering the entire surface area for effective heat radiation.
Solution Approach 2:
The invention changes from a single large-diameter fan to multiple smaller fans with extended radial blades. The cross fans utilize both axial and radial dimensions to achieve comprehensive heat sink coverage without requiring a large outer diameter, thus fitting within the squared heat sink constraints.
4Productivity
If multiple cross fans are added to maximize air flow rate, then air flow rate increases, but device complexity increases due to additional components
Solution Approach 1:
A spur gear system acts as an intermediary mechanism to transmit rotational motion from a single motor to multiple cross fans. The gear train distributes power efficiently to all fans, enabling high air flow rate with minimal increase in device complexity compared to using multiple independent motors.
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
The cross fan engine room blower achieves uniform air distribution, reduces the risk of motor stalling, and enhances fuel efficiency by maximizing air flow rate and improving air flow quality, thereby reducing power consumption.
Implementation Method 1
a driving cross fan that, when driven by a torque-generating motor, rotates in the air flow space and draws outside air into the engine room
Implementation Method 2
Heat exchange occurs between the forced air flow generated by the axial blower and the engine cooling water or the refrigerant circulated within the radiator or the condenser
Data Source
AI summary
The present disclosure relates to a cross fan engine room blower for a vehicle, the cross fan engine room blower including: a plurality of cross fans that are horizontally arranged in an air flow space, that have an impeller-shaped rotating blade formed along a full length of the cross fans, and that rotate to draw outside air into the engine room. Such a cross fan engine room blower may maximize an air flow rate in the engine room and reduce the possibility of foreign materials being introduced between the cross fans and a fan shroud, thereby reducing the possibility of a motor stalling or otherwise performing undesirably. Such a cross fan engine room blower may also improve an air flow quality by minimizing a dead zone of the air flow space to thereby reduce power consumption of a motor, thereby improving fuel efficiency.