Mixing Valve Temperature Limit Stop Adjustment Mechanism
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Solution Overview
Problem
Prior mixing valves for fluid delivery devices, such as shower systems, often require a retainer disk to be removed and reinstalled for adjusting the temperature rotational limit stop, which is inconvenient and may lead to improper settings.
Innovation Solution
A mixing valve design featuring a stop member with splines that engage with the cap's splines to limit rotational movement, allowing for adjustable temperature settings without the need to remove and reinstall a retainer disk, using a retainer coupled to the cap to bias the stop member axially and facilitate engagement between the splines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a retainer disk is used to secure the stop member, then the stop member can be retained in position, but the retainer disk must be removed and reinstalled for adjustment which is inconvenient
Solution Approach 1:
The retainer and cap are merged into a single integrated component. The retainer includes a body portion that forms part of the cap structure, eliminating the need for a separate retainer disk. This allows the stop member to be adjusted by simply rotating it within the integrated retainer structure without requiring removal and reinstallation of a separate retainer component.
Solution Approach 2:
The adjustment function is extracted from the retainer installation/removal process. The stop member is designed with an adjustment mechanism that allows it to be rotated to different positions independently of the retainer structure. The retainer simply provides the structural framework and retention features, while the stop member handles the adjustment function through its own geometry and engagement features.
2Ease of operation
If the stop member is freely adjustable, then easy temperature setting is achieved, but axial movement of the stop member may occur leading to improper settings
Solution Approach 1:
The stop member transitions from a fixed state to an adjustable state and back to a locked state. During adjustment, the stop member can be rotated freely to the desired position. Once positioned, the retainer structure with its engagement features (such as tabs or lugs that fit into corresponding slots or grooves in the stop member) automatically locks the stop member in place, preventing axial movement and ensuring the setting remains accurate during use.
Solution Approach 2:
The retainer structure acts as an intermediary between the stop member and the valve body. It provides the engagement features that selectively allow rotational movement for adjustment while preventing axial movement that would cause improper settings. The retainer's design creates a mechanical interface that permits the necessary degrees of freedom for adjustment while constraining movements that would compromise setting accuracy.
Data Source
AI summary
A temperature limit stop assembly for a mixing valve including a stop surface supported by a stem and a hot water stop shoulder supported by a stop member and engagable with the stop surface of the stem to limit rotational movement of a valve plate.