Pilot Valve Shower Switching Mechanism for Low Operation Force
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Solution Overview
Problem
Existing shower valve mechanisms require high operational effort due to direct water pressure application, leading to a cumbersome switching experience.
Innovation Solution
A pilot valve switch mechanism with a valve spool and control hole configuration that alternates water flow between outlets using water pressure, featuring a button mechanism with a restoring spring to reduce operational force and enhance user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If water pressure is directly applied to the sealing element for switching, then the switching function is achieved, but the operation force required is high
Solution Approach 1:
A pilot valve is introduced as an intermediary component between the water pressure source and the main sealing element. The pilot valve controls a small control hole that regulates pressure to a pressure cavity, which then acts on the sealing element. This intermediary mechanism allows high water pressure to be managed indirectly, reducing the force required by the user to operate the switching mechanism.
Solution Approach 2:
The system changes the pressure parameter distribution by creating a pressure cavity that accumulates and regulates water pressure. The control hole diameter is specifically designed to control the rate of pressure change in the cavity. By manipulating pressure parameters through the pilot valve and control hole, the system achieves switching with reduced operational force while maintaining effective sealing pressure when needed.
2Ease of operation
If a control hole is used to regulate pressure, then operation force is reduced, but the control hole diameter must be precisely controlled
Solution Approach 1:
The patent employs a pilot valve as a simplified copy or representative mechanism that controls the main switching function. Instead of directly controlling the main sealing element with complex pressure regulation, the pilot valve creates a scaled-down version of the pressure control system through the control hole. This copying approach allows the critical diameter control to be isolated to a small, manageable component rather than the entire switching mechanism.
3Ease of operation
If the control hole diameter is small to reduce pressure impact, then operation becomes easier, but the switching response may be slower
Solution Approach 1:
The system dynamically adjusts pressure flow through the control hole based on operational needs. The pilot valve mechanism allows the control hole to operate at small diameters during normal operation for ease of use, while the pressure cavity design and sealing element geometry ensure that pressure builds and releases in a manner that maintains adequate switching response speed. The dynamic interaction between the pilot valve, control hole, and pressure cavity creates a balanced system that achieves both ease of operation and acceptable response time.
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 mechanism provides a stable and effortless switching operation by balancing water pressures and utilizing a smaller control hole diameter, resulting in reduced friction and elastic force, thus improving the handle feel and reducing the effort required to switch between shower outlets.
Implementation Method 1
the water pressure of the pressure cavity (50) is controlled to drive the valve spool (100) to move along the inlet waterway (10)
Implementation Method 2
the friction between the sealing element and the outlet hole
Data Source
AI summary
A pilot valve switch mechanism and combined shower applied with the pilot valve switch mechanism includes a fixed portion and a valve spool. The fixed portion includes an inlet waterway, a first outlet waterway, a second outlet waterway and a control hole capable to connect to the outlet waterways. The first outlet waterway has a first outlet. The second outlet waterway has a second outlet. The valve spool is slidably assembled inside the fixed portion along the inlet waterway, with a slim hole connected to the inlet waterway. The valve spool and the fixed portion form a pressure cavity, which is connected to the control hole and the slim hole. The control hole controls the water pressure of the pressure cavity to drive the valve spool to close the first or second outlet, connecting the inlet waterway to the first or second outlet waterway. The control hole switches the waterways.