Variable-Ratio Shower Valve Actuator for Precise Temperature Control

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Shower mixing valves often require precise adjustments to achieve desired output temperatures, which can be challenging due to unpredictable mixing proportions and large temperature differentials, especially for users with reduced dexterity, and typically require excessive lever throw and limited practical temperature range usage.

Innovation Solution

A variable ratio shower mixing valve actuator that allows users to manually select a preferred actuation ratio through a gear selector mechanism, adjusting the effect of lever input on output flow, with mechanical temperature limit levers and a gear reduction system to optimize temperature adjustments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a fixed actuation ratio is used in traditional shower mixing valves, then the lever throw can be kept simple and direct, but the temperature adjustment becomes unpredictable and requires excessive lever movement for precise control

Engineering Contradiction:

Improvetemperature adjustment precisionVSAvoidlever throw requirement

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The patent applies dynamics by making the actuation ratio variable rather than fixed. The gear selector mechanism allows the user to choose between different gear ratios (e.g., 1:1, 2:1, 3:1), which dynamically changes how much lever movement translates to valve core rotation. This enables precise temperature control with minimal lever throw when needed, while maintaining operational flexibility.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of actuation ratio from a fixed value to a selectable variable. By providing multiple gear ratio options, the system allows users to adjust the mechanical advantage parameter according to their needs, enabling fine-tuned temperature control without requiring excessive lever movement.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If the temperature differential between cold and hot input flows is substantial, then the valve can provide a wide temperature range, but small lever actuation results in large unpredictable temperature changes

Engineering Contradiction:

Improvetemperature rangeVSAvoidtemperature control precision

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The variable gear ratio mechanism dynamically adjusts the relationship between lever actuation and valve core rotation. Users can select higher gear ratios (e.g., 3:1) when operating in ranges where small temperature changes occur, which reduces the actuation effect and provides finer control precision while maintaining the ability to access the full temperature range.

Inventive Principle:

Principle #15Dynamics

3Ease of operation

If users with reduced dexterity operate traditional shower valves, then the simple lever design should be easy to use, but the excessive lever throw and unpredictable mixing proportions create difficulty

Engineering Contradiction:

Improveuser accessibilityVSAvoidtemperature adjustment accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The gear selector mechanism provides dynamic adaptability for users with reduced dexterity. By selecting a higher gear ratio, these users can achieve precise temperature control with smaller, more manageable lever movements, reducing the physical dexterity required while maintaining accurate temperature adjustment capability.

Inventive Principle:

Principle #15Dynamics

4Ease of operation

If a gear reduction system is added to reduce lever throw, then precise temperature control with minimal movement is achieved, but the device complexity increases

Engineering Contradiction:

Improvelever throw reductionVSAvoidactuator mechanism complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent segments the actuation mechanism into modular components: a selector mechanism for choosing gear ratios, multiple gear sets with different reduction ratios, and a valve core actuation system. This segmentation allows the complex functionality to be organized into manageable, independent modules that can be selected and combined as needed.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The gear selector mechanism serves multiple functions: it selects the appropriate gear ratio, engages the corresponding gear set, and provides a user interface for adjustment. This multi-functionality reduces the need for separate control mechanisms, thereby limiting the increase in overall device complexity despite the added capability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

Enables users to easily and accurately adjust output temperature with minimal lever throw, improving usability and predictability by allowing selection of desired hot and cold limits and automatically adjusting the actuation ratio, thus enhancing user experience and reducing dexterity-related difficulties.

Implementation Method 1

Methodology Applied

Scientific EffectGear reduction: Gear

Data Source

PatentUS11408536B1Variable ratio shower mixing valve actuator

Publication Date: 2022.08.09 COPLEN JACK

AI summary

The present invention is a variable ratio shower mixing valve actuator. The system provides distinct advantages over existing shower valve actuators. The primary advantage is that the system allows a user to adjust the magnitude of the effect that a given actuation lever input will have on the output flow.