Rotor-Integrated Encoder for Rotary Valve Channel Alignment
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Solution Overview
Problem
Traditional rotary valves in laboratory automation systems face challenges with precise alignment between stator and rotor channels, leading to backlash and manufacturing tolerance issues, which result in pulsation, flow rate variations, and carry-over during fluid switching.
Innovation Solution
A rotary valve design incorporating a rotary encoder assembly with an encoder member directly connected to the rotor member, utilizing a ring-shaped encoder member with varying physical properties sensed by a sensor to achieve precise rotor positioning, eliminating backlash and misalignment, and ensuring accurate fluid communication between stator and rotor channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional valve drive mechanisms are used, then the device complexity is reduced, but the alignment precision between stator and rotor channels deteriorates due to backlash
Solution Approach 1:
The patent replaces the traditional mechanical gear drive with a direct motor drive system. The rotor is directly coupled to the motor shaft, eliminating the gear mechanism that causes backlash. This substitution of mechanical transmission with direct drive achieves high alignment precision while maintaining manageable device complexity through the use of modern motor control technology.
2Manufacturing precision
If manufacturing tolerances are relaxed, then the ease of manufacture is improved, but the alignment precision between stator and rotor channels deteriorates
Solution Approach 1:
The patent incorporates an encoder system that provides feedback on the rotor position. This feedback mechanism allows for real-time monitoring and correction of alignment, enabling the system to achieve high precision even with relaxed manufacturing tolerances. The encoder detects the actual position and allows the control system to compensate for any deviations, making the manufacturing process more forgiving while maintaining high alignment precision.
3Measurement precision
If an encoder assembly is added to improve positioning precision, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The patent integrates the encoder assembly directly with the rotor structure, merging the measurement function into the existing rotating component. This integration approach reduces the need for separate mounting structures and simplifies the overall device architecture. The encoder is positioned to work seamlessly with the rotor's rotational movement, achieving high measurement precision while minimizing the increase in device complexity through clever integration rather than addition.
Data Source
Figure 1
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AI summary
A rotary valve (10) comprises a stator member (36) with a stator face (54), the stator member (36) having at least two stator channels (46, 48) for conducting a fluid and opening into the stator face (54); a rotor member (24) with a rotor face (52) facing and in contact with the stator face (54), the rotor member (24) having a rotor channel (50) in the rotor face (52), wherein the rotor member (24) is rotatable with respect to the stator member (36) about a rotation axis (A), such that in a conducting position, the rotor channel (50) interconnects the at least two stator channels (46, 48) to be in fluid communication; and a rotary encoder assembly (33) adapted for determining a rotary position of the rotor member (24), the rotary encoder assembly (33) comprising an encoder member (34) and an encoder module (35), which is adapted to sense a rotary position of the encoder member (34). The encoder member (34) is rigidly connected to the rotor member (24) and surrounds the rotor member (24).