Valve device and fluid circulation circuit
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Solution Overview
Problem
Conventional valve devices experience instability in the posture of the rotor due to positional deviations of the shaft, leading to inaccuracies in flow rate control and unintended fluid leakage, as the end of the shaft deviates and becomes inclined when the fixed disc deviates within the housing.
Innovation Solution
A valve device design where at least a part of the rotation part is rotatably held by the housing, rather than by a member attached to it, to stabilize the posture of the rotor and prevent positional deviations, incorporating a shaft and rotor that adjust the opening degree of flow path holes with rotational force from a drive part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the rotation part is held by a member attached to the housing, then the device complexity is reduced, but the stability of the rotor posture deteriorates due to positional deviations of the shaft
Solution Approach 1:
The housing is divided into a first housing and a second housing that are coupled together, with the rotation part held between them. This segmentation allows the rotation part to be securely positioned by both housing components, preventing shaft deviation and stabilizing rotor posture without requiring overly complex single-structure designs.
Solution Approach 2:
The first housing and second housing are coupled to form an integrated structure that jointly holds the rotation part. By combining the holding function of both housing components, the system achieves stable rotor positioning while maintaining relatively simple individual housing structures.
2Ease of manufacture
If the shaft position deviates within the housing, then the ease of manufacture is improved with simpler positioning, but the measurement precision of flow rate control deteriorates
Solution Approach 1:
The rotation part is pre-positioned and held firmly between the first and second housings before assembly is completed. This preliminary positioning ensures that the shaft maintains its correct orientation throughout the assembly process and operation, preventing deviation that would compromise flow rate control accuracy.
Solution Approach 2:
The second housing acts as an intermediary component that provides the holding function for the rotation part. By introducing this intermediate structure, the system achieves precise shaft positioning without requiring complex positioning mechanisms in the first housing or direct complex integration.
3Device complexity
If the shaft becomes inclined due to positional deviation, then the device complexity is reduced with simpler support structure, but the reliability of fluid circulation deteriorates due to unintended leakage
Solution Approach 1:
The support structure is segmented into two housing components that jointly hold the rotation part. This segmentation distributes the support function, maintaining shaft alignment and preventing inclination that would cause leakage, while keeping each individual housing component relatively simple in structure.
Solution Approach 2:
The holding function is merged between the first housing and second housing, creating a stable support system that prevents shaft inclination. By combining the support capabilities of both housings, the system achieves reliable fluid circulation without requiring overly complex single-structure support mechanisms.
Data Source
AI summary
A valve device includes a housing integrally or separately having a flow path formation part where at least one flow path hole through which a fluid passes is formed. The valve device includes: a drive part that outputs a rotational force; and a rotation part that rotates about a predetermined axis by the rotational force output from the drive part. The rotation part includes a shaft and a rotor increasing or decreasing an opening degree of the flow path hole with rotation of the shaft. The rotor has a sliding surface that slides while facing an opening surface of the flow path formation part where the flow path hole is opened. At least a part of the rotation part is rotatably held by the housing.