Fluid Switching Valve Recess Design for Wear Reduction
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Solution Overview
Problem
The increased speed and pressure of fluid feeding in liquid chromatography systems lead to increased wear and potential leakage at the contact surface between the stator and rotor seal in fluid switching valves, causing rubbing and debris incorporation into the flow path.
Innovation Solution
A fluid switching valve design featuring a stator with through holes and a rotor seal with a connection groove and recess, where the recess reduces the pressure applied to the contact surface by distributing the load more evenly, using regions of varying rigidity to minimize wear and leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the fluid feeding speed and pressure are increased to improve analysis efficiency, then the productivity is improved, but the wear and rubbing at the contact surface between stator and rotor seal increases
Solution Approach 1:
The rotor seal is designed with a recess at its outer peripheral portion, creating a local structural difference. This recess reduces the contact area and distributes the fastening load away from the outer peripheral region, thereby reducing rubbing and wear at this critical location while allowing high-speed, high-pressure fluid feeding to continue
2Reliability
If a space is provided in the contact surface to reduce the rubbing area, then the wear is reduced, but the manufacturing precision requirement increases due to burr formation risks
Solution Approach 1:
Instead of creating a space directly in the contact surface (which would require high precision to avoid burrs), the recess is formed at the outer peripheral portion of the rotor seal, away from the critical contact surface. This local modification reduces rubbing without compromising the integrity or finish of the contact surface itself
Data Source
AI summary
Provided are: a flow path switching valve that reduces the pressure load in a contact surface outer peripheral section of the flow path switching valve and inhibits friction between constituent components; and a liquid chromatographic device using the flow path switching valve. The flow path switching valve is provided with a stator having a plurality of through holes and a seal having conduction grooves for causing the through holes to conduct. The seal has a first portion present vertically beneath a region comprising at least a surface of contact with the stator, and a second portion having lower rigidity than the first portion, on the outside of the first portion. Due to this configuration, it is possible to reduce the pressure load when a flow path of a liquid is switched under high-pressure conditions, and inhibit the phenomenon of friction itself.