Gear-Driven Flow Modulator for Precise Gas Flow Control
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Solution Overview
Problem
Existing flow modulators for fluids, such as combustion gases, face challenges in reliable flow modulation, tolerance compensation, and cost-effective assembly, particularly in achieving a high resolution of flow resistance.
Innovation Solution
A flow modulator design featuring a rotatable valve body with a gear transmission system, including a guide pin and groove mechanism, and toothing configurations that allow for rotational and translational displacement, enabling precise modulation and tolerance compensation while maintaining a simple and inexpensive assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a gear transmission is introduced to achieve high resolution flow modulation, then the flow modulation precision is improved, but the device complexity increases
Solution Approach 1:
A gear transmission mechanism is introduced as an intermediary between the actuator and the valve body. The actuator rotates the drive wheel, which through gear engagement with the toothing on the valve body, converts rotational motion into precise rotational displacement of the valve body. This intermediary mechanism enables high-resolution flow modulation by translating small actuator movements into controlled valve position changes.
2Adaptability or versatility
If the valve body is made rotatably displaceable to modulate fluid flow, then the flow modulation capability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The guide groove is designed with intentional clearance and tolerance zones to compensate for manufacturing variations. The circumferential groove with radial width provides a tolerance buffer that allows the valve body to rotate smoothly while maintaining proper alignment with the drive wheel toothing. This beforehand cushioning through tolerance design reduces the stringency of manufacturing precision requirements.
3Reliability
If a guide pin and groove mechanism is used to constrain valve body movement, then the reliability of flow modulation is improved, but the device complexity increases
Solution Approach 1:
The guide groove is segmented into functional zones: a first portion that guides rotational movement and a second portion that constrains diagonal/orthogonal displacement. This segmentation allows the single guide groove structure to perform multiple constraint functions independently, ensuring reliable valve body positioning while maintaining structural simplicity.
4Ease of manufacture
If the circumferential groove has radial width to allow valve body rotation, then the ease of assembly is improved, but the manufacturing precision of the groove increases
Solution Approach 1:
The circumferential groove is designed with a specific radial width parameter that balances assembly ease and manufacturing precision. The radial width is sized to provide sufficient clearance for the valve body toothing to engage smoothly during assembly, accommodating normal manufacturing tolerances. This parameter optimization allows simple assembly procedures while the groove itself can be manufactured using conventional machining processes.
Data Source
Figure 1a~1b
Figure 1c~1d
Figure 2a~2b
AI summary
Flow modulator (10) for a fluid like combustion gas, comprising: a modulator body (11) having a channel (14) providing a flow passage (20) for the fluid; a valve body (17) having an opening (18) providing another flow passage (19) for the fluid; an actuator (21) by which the valve body (17) is rotatably displaceable relative to the modulator body (11) to modulate the fluid flow by changing the overlap between the opening (18) or flow channel (19) of the valve body (17) and the channel (14) or flow passage (20) of the modulator body (11); a gear transmission (22), wherein an input side of the gear transmission (22) is in operative connection with the actuator (21) having a fixed axis of rotation (23), and wherein an output side of the gear transmission (22) is in operative connection with the valve body (17) having a translationally displaceable axis of rotation (24).