Faucet Control Valve Layout for Stable Cold-Hot Mixing
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Solution Overview
Problem
Conventional manual/automatic cold/hot water faucets may dispense hot water in automatic mode after a user has used hot water in manual mode, posing a safety risk and failing to maintain a consistent cold-to-hot water ratio during power outages or sensor failure.
Innovation Solution
A control valve with a sliding member, linking member, and operating member that adjusts the communication between water passages to maintain a consistent cold-to-hot water ratio by positioning a guide block within a restricting groove, ensuring the same ratio is maintained in automatic mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the faucet uses a sensor for automatic water dispensing, then automation is improved, but reliability deteriorates during power outage or sensor failure
Solution Approach 1:
The control valve is divided into separate functional components: a sensor-controlled automatic control portion and a manual operating portion. This segmentation allows the system to switch between automatic and manual modes, ensuring that if the sensor fails or power is lost, the manual portion can still operate the valve to dispense water, thereby maintaining reliability while preserving automation capability.
2Reliability
If the faucet allows manual mode operation, then reliability is improved, but safety deteriorates due to inconsistent water temperature ratio
Solution Approach 1:
The control valve pre-estabilizes the water temperature ratio during installation or initial setup. This preliminary action ensures that when the system switches to automatic mode after manual operation, the cold-to-hot water ratio is already optimized, preventing the dangerous situation where previously dispensed hot water ratio settings could cause burns. The system proactively maintains safe temperature ratios rather than reactively correcting them.
3Object-affected harmful factors
If the control valve maintains fixed water ratio, then safety is improved, but adaptability deteriorates for different user needs
Solution Approach 1:
The control valve implements dynamic operation where the water temperature ratio can be adjusted between a predetermined safe ratio and user-customized ratios. The system dynamically switches between a default safe mode (maintaining predetermined cold-to-hot water ratio) and a customizable mode (allowing user adjustment), enabling it to adapt to different user needs while maintaining safety as the baseline state.
Data Source
AI summary
A control valve of a manual/automatic and cold/hot water faucet includes a sliding member, a linking member, and an operating member. The sliding member has a notch. The linking member is recessed with a connecting groove. The operating member has a valve stem and a linking portion. The linking portion drives the linking portion and the sliding portion through the connecting groove. The valve stem, the connecting groove and the central axis are arranged concentrically, so that the overlapping area of the notch and the cold water hole is equal to the overlapping area of the notch and the hot water hole to keep the same ratio of cold water to hot water in an automatic mode to dispense water, thereby increasing the safety in use.