Rotary Switching Valve Head Positioning Without Re-Teaching
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Solution Overview
Problem
Conventional rotary-type switching valves require re-teaching after replacing the valve head due to changes in the relative positional relationship between the rotor and rotor shaft, leading to increased user workload and reduced durability from increased frictional forces at high pressures.
Innovation Solution
Incorporating a home position sensor and a teaching information holder within the valve head to store specific positional data, allowing the controller to read and utilize this information for precise rotor positioning without the need for re-teaching when the valve head is replaced.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the switching valve is designed for high pressure resistance, then pressure resistance is improved, but frictional force between rotor and stator increases leading to reduced durability
Solution Approach 1:
The switching valve is divided into separable components: a driver unit and a valve head unit. The valve head can be replaced independently without replacing the entire switching valve, allowing users to optimize for different pressure requirements while maintaining the same driver mechanism.
Solution Approach 2:
Different valve head designs can be created with varying pressure resistance parameters. Users can select valve heads appropriate for their specific application pressure requirements, balancing pressure resistance and durability based on actual needs.
2Device complexity
If teaching information is not stored in the valve head, then device complexity is reduced, but re-teaching is required after valve head replacement increasing user workload
Solution Approach 1:
The valve head is equipped with a home position sensor and teaching information holder that enable it to self-identify its rotational characteristics. When replaced, the new valve head automatically provides its teaching information to the controller, eliminating the need for manual re-teaching by the user.
Solution Approach 2:
A teaching information holder acts as an intermediary between the valve head and controller. It stores and transfers rotational characteristic data, enabling automatic recognition and positioning without requiring complex manual intervention or recalibration procedures.
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
Eliminates the need for re-teaching after valve head replacement, maintaining high positioning accuracy and reducing user workload while maintaining high-pressure resistance without compromising durability.
Implementation Method 1
an optical sensor (hereinafter referred to as a home position sensor) for detecting the slit of the disk is provided
Data Source
AI summary
A switching valve includes a valve head having a plurality of connection ports connecting a pipe, a rotor accommodated therein and including a groove for connecting the connection ports, and a rotor shaft holding the rotor and rotatably equipped, and a driver having a holder holding the valve head and a motor rotating the rotor shaft of the valve head held by the holder. Further, the valve head is provided with a home position sensor detecting a reference position in a rotation direction of the rotor shaft, and a teaching information holder holding information on a relative positional relationship between the reference position and a position of the rotor shaft when the rotor is at a predetermined position, and the reference position acquired using the home position sensor.