Pressure-Balanced Mixing Valve for Precise Low-Power Temperature Control
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Solution Overview
Problem
Existing thermostatic mixing valves face challenges in maintaining a constant outlet water temperature due to pressure and temperature fluctuations in supply lines, leading to temperature errors and slow response times, and conventional electric systems require high power consumption and complex electronics.
Innovation Solution
A frictionless, pressure-balanced proportioning valve assembly with a spool and diaphragm seals, driven by a low-power electric motor, which maintains minimal force requirements and reduces friction, allowing for efficient temperature control with a compact mixing chamber and optimized flow path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional proportioning valves with electric drive units are used, then temperature control precision is improved, but power consumption increases and device complexity increases
Solution Approach 1:
The patent replaces the conventional electric motor drive system with a purely mechanical self-balancing proportioning valve mechanism. The valve uses pressure-balanced piston and spring elements to automatically adjust hot and cold water flow proportions in response to inlet pressure fluctuations, eliminating the need for electric motors, sensors, and electronic control circuits while maintaining precise temperature control
Solution Approach 2:
The proportioning valve is designed to automatically sense and respond to inlet water pressure changes through its internal pressure-balanced mechanism. The system self-regulates the mixing ratio without requiring external power supply or electronic control, with the mechanical elements spontaneously adjusting to maintain constant outlet temperature
2Measurement precision
If conventional proportioning valves with electric drive units are used, then temperature control precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces the conventional electric motor drive system with a purely mechanical self-balancing proportioning valve mechanism. The valve uses pressure-balanced piston and spring elements to automatically adjust hot and cold water flow proportions in response to inlet pressure fluctuations, eliminating the need for electric motors, sensors, and electronic control circuits while maintaining precise temperature control
Solution Approach 2:
The invention extracts and removes all electronic components (motors, sensors, control circuits) from the thermostatic mixing valve system, retaining only the essential mechanical proportioning mechanism that inherently provides temperature control through pressure-balanced operation
3Device complexity
If wax element thermostatic valves are used, then device complexity is reduced, but response time increases and temperature precision deteriorates
Solution Approach 1:
The patent replaces the slow-responding wax element thermal expansion mechanism with a direct-acting pressure-balanced mechanical proportioning valve. This mechanical system responds instantaneously to inlet pressure changes by directly adjusting the mixing ratio, achieving fast response times while maintaining simple device architecture
4Device complexity
If wax element thermostatic valves are used, then device complexity is reduced, but temperature precision deteriorates
Solution Approach 1:
The patent replaces the slow-responding wax element thermal expansion mechanism with a direct-acting pressure-balanced mechanical proportioning valve. This mechanical system responds instantaneously to inlet pressure changes by directly adjusting the mixing ratio, achieving fast response times while maintaining simple device architecture
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
The solution achieves precise temperature control with minimal power consumption, reducing temperature errors and response times, and eliminates the need for complex electronics, providing a stable and efficient thermostatic mixing system.
Implementation Method 1
Two seals disposed at both ends of the spool and housing, are configured, by effective area equalization, for pressure balancing of the first tubular water inlet chamber between a first seal and the disk portion, and pressure balancing of the second tubular water inlet chamber between a second seal and the disk portion
Implementation Method 2
Attached drive means, energized by a low power electric motor, axially displacing said spool
Data Source
Figure 1~2
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Figure 5
AI summary
A frictionless, pressure balanced proportioning valve assembly, for low power electric operated thermostatic cartridge, composed of a housing with spaced apart hot and cold water inlets and intermediate mixed water outlet, flow communicated to a spool bore with a central widened portion; a spool, guided in the spool bore, by widened end portions, is carrying a central widened disk portion, separating the spool bore into two tubular inlet chambers; two diaphragm seals disposed at both ends of the spool and housing, pressure balancing the inlet chambers; a temperature sensor, exposed to the mixed water outlet pathway, generates a signal, readable by a control circuit; a drive unit energized by a low power electric motor, driving past gear train and eccentric shaft, a bendable connecting rod, axially displacing the spool. Axial displacement of the balanced friction-free spool, proportions flow from the hot and cold water inlets to the mixed water outlet.