Pressure-Balanced Switching Valve for Faster Solenoid Response
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Solution Overview
Problem
Existing switching valves in refrigeration and heating cycles face challenges with delayed valve opening/closing speeds, increased part count and manufacturing costs due to high service pressures and complex fluid passage requirements.
Innovation Solution
A switching valve design with a valve chamber, first and second valve seats, fluid passages, a valve body that lifts between the seats, a rod portion with a guide bore, and a solenoid-actuated rod, where the first pressure-receiving area of the valve body is balanced with the pressure-receiving area of the rod portion, allowing for efficient opening/closing independent of operating fluid pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional switching valve design is used with high service pressure, then the valve can handle refrigeration and heating cycles, but the valve opening/closing speed becomes delayed
Solution Approach 1:
The valve body is divided into multiple independent valve portions (first valve portion with first and second valve bodies, second valve portion with third and fourth valve bodies), each handling specific fluid passages. This segmentation allows each valve body to be optimized for its specific pressure conditions, improving response speed while managing high service pressure effectively.
Solution Approach 2:
The patent balances pressure forces by designing the first and second valve bodies to experience equal and opposite pressure forces from the operating fluid. This equipotential design eliminates net pressure-induced delays in valve opening/closing, allowing the valve to respond quickly regardless of high service pressure conditions.
2Reliability
If multiple valve portions and complex fluid passages are added to handle high pressure, then the valve can operate in refrigeration cycles, but the number of parts and manufacturing cost increase
Solution Approach 1:
The patent combines multiple valve functions into an integrated valve main body structure where the first and second valve portions work together in a coordinated manner. The fluid passages are designed to flow continuously through the valve body, reducing the need for separate components and connections, thereby lowering manufacturing cost while maintaining reliability under high pressure.
Solution Approach 2:
The valve body is designed with multi-functionality to handle both refrigeration and heating cycles through a single integrated structure. The first and second valve portions can independently control different fluid passages, allowing the valve to perform multiple functions (cooling, heating, pressure regulation) without requiring additional specialized components.
3Manufacturing precision
If narrow fluid passages are fabricated to control operating fluid, then the valve can regulate pressure, but manufacturing difficulty and cost increase
Solution Approach 1:
The patent applies different quality characteristics to different regions of the valve body. The fluid passages are designed with varying cross-sectional areas optimized for their specific functions - wider passages where high flow is needed, narrower passages where precise pressure control is required. This local optimization reduces manufacturing difficulty while maintaining the necessary control precision for each specific fluid passage.
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
This design enhances valve opening/closing response, reduces part count and manufacturing costs, and allows for flexible fluid passage design, enabling efficient operation with either large or small fluid volumes, and compact or large valve configurations.
Implementation Method 1
an operational force of a solenoid portion
Data Source
AI summary
A selector valve, comprising a valve chamber having a first valve seat and a second valve seat facing the first valve seat, a first fluid passage communicating with a first valve port on the periphery of the first valve seat of the valve chamber to flow a first working fluid therein, a second fluid passage communicating with the valve chamber to flow the working fluid therefrom or therein, a third fluid passage communicating with a second valve port on the periphery of the second valve seat of the valve chamber to flow the working fluid therefrom, a valve element disposed in the valve chamber and alternately separating from and coming into contact with the first valve seat and the second valve seat, a stem part connected to the valve element, a guide hole movably guiding the valve stem, a storage chamber for a seal means installed around the guide hole, an auxiliary passage allowing the storage chamber to communicate with the first fluid passage, and a solenoid part connected to the stem part for operating a solenoid rod. A first pressure receiving area formed by the first valve seat and the valve element joined to each other to receive the pressure of the first working fluid is set approximately the same as the third pressure receiving area of the stem part receiving the first working fluid in the storage chamber.