Pre-assembled Fan Blade Angular Alignment Mechanism
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Solution Overview
Problem
Existing fan blade systems for cooling vehicle coolants in agricultural tractors and off-road vehicles face issues with debris accumulation on radiators due to air flow, leading to reduced cooling efficiency and overheating, and require complex and costly auxiliary devices for controlled rotation and stable angular orientation.
Innovation Solution
A fan blade system with a pre-assembled structure featuring a hub and blades with a secure locking mechanism and adjustable inflow angle, utilizing a single-piece hub and pre-defined angular orientation to ensure uniform blade alignment, allowing for easy installation and maintenance without additional devices, and enabling efficient air flow control for both cooling and cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a double screw/female thread connection is used to fasten blade and adjusting device, then the blade can be assembled to the fan, but the relative angular position of the blades is not constant and definite due to imprecision in thread construction, resulting in reduced efficiency
Solution Approach 1:
The blade is pre-assembled with the adjusting device at the factory with a definite and predetermined angular orientation. This preliminary assembly ensures precise angular positioning is achieved during manufacturing, eliminating the imprecision issues of thread connections during field assembly.
Solution Approach 2:
The invention uses a simplified connection mechanism (set screw and slot) that copies the essential function of the complex double thread connection while achieving better precision. The pre-assembled unit replicates the precise angular orientation at the factory level rather than attempting to achieve it through field assembly.
2Adaptability or versatility
If fluid-dynamic apparatus for controlled rotation are used, then fan blade rotation can be controlled, but special means for supplying fluid to blade movement devices are required which are not always present on vehicles and require installation of compressor and connection pipes, increasing costs and complexity
Solution Approach 1:
Instead of using fluid pressure to control blade rotation as in conventional systems, the invention uses a mechanical linkage system where the blade adjusting device is directly connected to the blade through a slot and set screw mechanism. This inverts the approach from fluid-dynamic control to direct mechanical control.
Solution Approach 2:
The blade adjusting device serves multiple functions: it controls the inflow angle of the blades and provides the mechanical connection for rotation control. The device uses the existing air flow and mechanical structures already present on the vehicle, eliminating the need for separate compressors and piping systems.
3Adaptability or versatility
If fluid-dynamic apparatus are used for blade rotation control, then controlled rotation is achieved, but the position of blades at various entry angles is unstable and requires complicated auxiliary locking elements such as counterweights, resulting in undesirable and noisy angular oscillations
Solution Approach 1:
The invention replaces the unstable fluid-dynamic balancing approach with a direct mechanical locking mechanism. The set screw in the slot provides positive mechanical engagement that stabilizes the blade at each adjusted angle, eliminating the oscillations caused by fluid-dynamic forces.
Solution Approach 2:
The invention replaces the complex fluid-dynamic balancing system with a simple mechanical locking system. The set screw and slot mechanism provides stable angular positioning through direct mechanical engagement, eliminating the need for counterweights and complex auxiliary locking elements.
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 solution ensures stable and uniform blade orientation, optimizing fluid-dynamic effects and reducing energy consumption, while allowing for easy installation and maintenance, and enabling efficient air flow control for both cooling and cleaning operations.
Implementation Method 1
the fan, when rotated, drawing in the air and forcing it to pass through the radiator, causing heat dissipation from the coolant contained therein
Implementation Method 2
the angle formed by the surface of the blades with the axial direction of air - below referred to as inflow angle - may be adjusted within a certain range in order to increase/decrease the flow according to the actual fluid cooling requirements
Data Source
Figure 1~3
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Figure 6
AI summary
Pre-assembled blade (20) for fans (10) for cooling the coolant contained inside the radiator (1) of operating machines and/or vehicles, comprising a blade body (20a) rigidly connected to an axial shank (21), a part of which situated radially on the outside of the blade body is in the form of a cylindrical pin (21b); wherein the shank (21) has a part axially on the outside of the blade body in the form of a cylindrical pin (21b), holes (21c) with internal female threading being formed inside the pin (21b); and in that the blade (20) comprises - a blade flange (22) comprising. a hollow cylindrical body (22a), the opposite end bases of which comprise respectively: a flat edge (22b) provided with through-holes (22c). an inset annular seat (22d); a disk (23) provided with through-holes (23a) and an eccentric recess (23d) for stably containing with friction a pin (24) which is also eccentric, for rotationally actuating the blade about its axis; - screws (25) designed to pass through the through- holes (23a) in the disk (23) and mate with the female thread of the holes (21c) in the pin (21b) in order to fix relative to each other the disk (23), flange (22) and pin (21b), thus ensuring a definite angular alignment of the blade relative to the pin (24) during pre-assembly.