Stator Fixing Member for Liquid Chromatograph Valve
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Solution Overview
Problem
The existing rotary type flow channel switching valves for liquid chromatographs require frequent replacement of consumable parts like the rotor and stator, leading to increased exchange costs and handling difficulties due to the need for precise positioning and fixation of the stator and packing, often resulting in the entire housing top being replaced instead of just the stator.
Innovation Solution
A flow channel switching valve design featuring a stator fixing member that allows easy attachment and detachment of the stator, preventing it from dropping and enabling solo exchange without replacing the entire housing top, while maintaining liquid tightness through a packing interposed between the stator and the flow channel connection portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stator and packing are fixed to the housing top by a spring pin or the like, then the stator and packing are securely held in position, but it becomes difficult to detach the stator and packing from the housing top, resulting in the entire housing top being exchanged instead of just the stator
Solution Approach 1:
The invention introduces a stator fixing member as a separate detachable component that secures the stator to the housing top. This segments the fixing mechanism from the housing top itself, allowing the stator fixing member to be removed independently along with the stator, while leaving the housing top intact. The fixing member acts as an intermediate element that can be easily detached, solving the contradiction between secure positioning and ease of repair.
2Ease of repair
If the stator and packing are not fixed to the housing top, then exchange work becomes easier, but the stator and packing may drop from the housing top, creating handling difficulties
Solution Approach 1:
The stator fixing member serves as an intermediary element between the stator/packing and the housing top. It provides a secure attachment mechanism that prevents the stator and packing from dropping during handling, while simultaneously being easily detachable to facilitate quick exchange work. The fixing member mediates between the need for secure positioning and the need for easy handling.
3Ease of repair
If the entire housing top is exchanged instead of just the stator, then the stator is replaced, but exchange costs of parts increase
Solution Approach 1:
By introducing the detachable stator fixing member, the invention enables segmentation of the replacement process. Only the stator and its fixing member need to be removed and replaced, while the expensive housing top remains in place. This significantly reduces part exchange costs by avoiding the unnecessary replacement of the entire housing top assembly.
Data Source
AI summary
A flow channel switching valve is provided that includes a stator and a rotor inside a housing, and rotates the rotor by a rotor drive portion while sliding the rotor on the stator, wherein the stator is fixed to a housing top by a stator fixing member. The stator fixing member is configured so as to have a portion detachably mounted on the housing top from a stator side, and a portion holding the stator.