Centrifugal Governor for Fan Shutter Load Distribution
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Solution Overview
Problem
Existing centrifugal governor devices for fan shutters are complex, costly, prone to wear, noisy, and require frequent maintenance due to their construction and susceptibility to jamming from solid particles in environments like industrial plants and greenhouses, with the connecting rod's inclination affecting bearing durability and requiring stronger, heavier fins for torque transmission.
Innovation Solution
A centrifugal governor device with a translating and rotating assembly using counterweights to generate centrifugal force, connected via a fork and connecting rod to multiple shutter operation fins, allowing simultaneous opening and closing, distributing loads and reducing bearing stress, with optional telescopic and elastic elements for adjustable length and improved fin positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a centrifugal governor device with connecting rod and fin assembly is used to control shutter operation, then automatic shutter operation is achieved, but the connecting rod inclination varies with fin position causing reduced bearing life
Solution Approach 1:
The shutter is divided into multiple independent fins that can be actuated separately or simultaneously. The governor device controls at least one fin directly, while other fins are actuated through transmission means, segmenting the control mechanism to reduce the load and inclination stress on any single connecting rod and bearing assembly.
Solution Approach 2:
Transmission means are introduced as intermediary mechanisms between the governor device and the remaining fins. These transmission means distribute the actuation force multiple ways, reducing the mechanical stress and inclination variations on the primary connecting rod and bearing, thereby extending bearing life while maintaining automatic operation.
2Force
If the fin connected to the connecting rod is made stronger to transmit torque to the whole shutter, then the shutter can be opened and closed, but the fin becomes thicker and heavier
Solution Approach 1:
The torque transmission function is segmented across multiple fins rather than concentrated in one heavy fin. The governor device actuates at least one fin directly, and through transmission means, this motion is transferred to other fins. This distribution allows each fin to be lighter and thinner while the system as a whole maintains sufficient torque capability.
Solution Approach 2:
Multiple fins work together as a combined system for shutter actuation. Instead of one heavy fin carrying the entire torque load, the torque and motion are merged across several fins through the transmission means, reducing the individual fin weight and thickness requirements while maintaining overall system capability.
3Ease of operation
If a centrifugal governor device with multiple linkages and articulated systems is used, then shutter control is achieved, but the device complexity increases and maintenance requirements increase
Solution Approach 1:
The essential shutter control function is extracted and achieved through a simplified governor device that directly actuates at least one fin. Complex multi-linkage systems are replaced with a more straightforward mechanism using transmission means that can transfer motion from one fin to others, reducing overall device complexity while maintaining full shutter control functionality.
Solution Approach 2:
The governor device with transmission means creates a self-sufficient system where the actuation of one fin automatically triggers the motion of other fins through the transmission mechanism. This reduces the need for complex external linkages and articulated systems, simplifying the overall device while maintaining ease of operation.
4Duration of action of stationary object
If the connecting rod is positioned to be parallel to the rotation axis in all movement phases, then bearing life is improved, but the device complexity and positioning precision requirements increase
Solution Approach 1:
The shutter control is segmented so that at least one fin is actuated directly by the governor device with simplified positioning requirements. Other fins are actuated through transmission means that handle the positioning complexity, allowing the primary connecting rod to maintain better alignment with the rotation axis without requiring extremely high precision across all components.
Solution Approach 2:
Transmission means serve as intermediaries that absorb and accommodate positioning variations. These transmission mechanisms can tolerate certain angular and positional deviations, allowing the connecting rod to maintain sufficiently parallel alignment with the rotation axis to extend bearing life without requiring excessive manufacturing precision.
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 results in a more reliable, lighter, and cost-effective fan with increased bearing life and dependability, as loads are better distributed, and the need for stronger fins is eliminated, while minimizing play and noise, and allowing for longer operation without frequent maintenance.
Implementation Method 1
said assembly is adapted to move as a result of the centrifugal force generated by said masses when the shaft is rotated and the consequent rotation of said levers about the relative pins
Data Source
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AI summary
Fan (1), comprising a centrifugal governor device (15) for automatic operation of a shutter (4) provided with fins (104), housed in a container (2) and comprising blades (5) which can be connected to a rotation shaft (6) connected to operation means (7); said centrifugal governor device (15) comprises at least one translating and rotating assembly (115) to which the lower ends of a pair of levers (29, 30) are connected, in a rotatable manner; said levers are symmetrical with respect to said assembly (115) and each comprises, at the upper end, at least one counterweight mass (31) and, in an intermediate position, a rotation pin (129, 130); said assembly (115) is adapted to move as a result of the centrifugal force generated by said masses (31) when the shaft (6) is rotated and consequent rotation of said levers (29, 30) about the relative pins (129, 130); said centrifugal governor device (15) is provided with a translating element (215) connected on one side to said assembly (115) by means of at least one bearing (16) and on the other side to a connecting rod (18, 18', 18") connected by means of appropriate transmission elements (39, 34, 37) to two or more fins (104a, 104b, 104c, 104d) for operation of the shutter (4) so as to simultaneously open them or close them; said two or more fins (104a, 104b, 104c, 104d) are connected by means of appropriate transmission means (9, 10) to the remaining fins (104) of the shutter (4) to allow simultaneous and automatic opening or closing thereof.