Discharge Cold Switching Valve for Shower Water Management
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Solution Overview
Problem
Traditional switching valves for discharging cold water are inefficient, requiring manual control and time to differentiate between cold and warm water discharge, leading to wasted hot water and potential damage from high pressure.
Innovation Solution
A switching valve design with separate states for discharging cold water and water outlet, featuring an operating member, first switching member, and water outlet switching member, which automatically switches between discharge cold and shower modes, using seal rings and a temperature sensor to prevent hot water waste and manage pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a one-way valve and reset spring are used to control the discharge cold passage, then the cold water discharge function is achieved, but the flow area is very small and the discharge time is greatly extended
Solution Approach 1:
The patent transforms the static one-way valve structure into a dynamic switching mechanism. The switching member can actively transition between blocking and opening positions, allowing the valve to adapt its state based on operational requirements rather than remaining fixed in one position.
Solution Approach 2:
The switching member utilizes water pressure differential to automatically transition between states. When discharge cold passage pressure exceeds head water outflow passage pressure, the switching member automatically opens, eliminating the need for external actuation mechanisms.
2Reliability
If the discharge cold passage is used during hand shower operation, then cold water can be discharged, but water spills from the top spray when flow is reduced or stopped due to increased pressure
Solution Approach 1:
The switching mechanism provides automatic feedback control based on pressure differential. When the hand shower reduces flow or stops, the pressure balance changes and automatically signals the switching member to close the discharge cold passage, preventing water spillage.
Solution Approach 2:
The switching member acts as an intermediary between the discharge cold passage and the water supply. It mediates the connection based on pressure conditions, allowing flow when appropriate and blocking when necessary to prevent spillage.
3Ease of operation
If manual control is used to switch between cold and warm water, then the user can control water temperature, but time is wasted waiting for cold water discharge and hot water may be wasted
Solution Approach 1:
The system performs preliminary action by automatically discharging cold water from the discharge cold passage before the user needs to use the shower. This pre-clearing of cold water eliminates the waiting time when the user first activates the shower.
Solution Approach 2:
The switching mechanism serves itself by automatically managing the cold water discharge process based on pressure differential, eliminating the need for manual intervention and reducing both waiting time and hot water waste.
4Reliability
If the one-way valve is in the normally closed state, then cold water discharge is controlled, but a certain suction is required to open the valve which may not be achieved under low pressure
Solution Approach 1:
Instead of requiring suction to open the valve, the design inverts the mechanism so that pressure differential directly opens the switching member. The valve opens when discharge cold passage pressure is higher, eliminating the need for suction generation.
Solution Approach 2:
The switching mechanism utilizes hydraulic pressure differential from the water flow itself to actuate the switching member. This pneumatic-hydraulic approach eliminates the need for mechanical suction generation and works reliably across varying pressure conditions.
Data Source
AI summary
A switching valve for discharging cold water includes: an operating member, a first switching member, and a water outlet switching member. The switching valve for discharging cold water has a cold water discharging passage and a head water outflow passage. When the operating member is in the initial position, the switching valve for discharging cold water is in the first position, the joint between the head water outflow passage and the water inlet end is sealed, the cold water discharging passage opens; when the operating member switches to the shower position, the first switching member is moved by the operating member to the second position, a second joint between the cold water discharging passage and the water inlet end is sealed, and the head water outflow passage opens, engaging the operating member with the water outlet switching member. The operating member drives the water outlet switching member to open one or both of the first and second water outlet passages.