Solenoid Valve Flow Path Layout for Stable Proportional Control
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Solution Overview
Problem
Solenoid valves face challenges in maintaining leakproof sealability and achieving accurate proportional control due to rapid pressure changes during initial opening, leading to instability and abnormal operations.
Innovation Solution
The solenoid valve design includes a valve housing with a flow path guide and a plunger that selectively directs fluid flow, using both elastic force from a spring member and fluid pressure to maintain blockage of the outlet flow path, while minimizing rapid pressure changes through strategically placed inflow and guide flow paths, and a sealing member to enhance leakproof sealability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve member is opened by applying fluid pressure to the rear portion, then the outlet flow path can be blocked effectively, but rapid pressure changes occur in the front portion causing deterioration of proportional control accuracy
Solution Approach 1:
The valve body is divided into a front portion and a rear portion with separate flow paths. The rear portion receives fluid pressure to maintain blockage, while the front portion has a restricted flow path that prevents rapid pressure changes, thereby maintaining both sealability and control accuracy
Solution Approach 2:
Different portions of the valve have different flow path characteristics. The rear portion allows free fluid pressure application for effective blocking, while the front portion has a restricted flow path with smaller cross-sectional area to control pressure changes, creating local quality differences that resolve the contradiction
2Speed
If fluid flows rapidly into the front portion during initial opening, then the valve member can be actuated, but pressure changes cause difficulty in controlling movement stroke
Solution Approach 1:
The flow path guide creates local quality differences by providing a restricted flow path in the front portion with smaller cross-sectional area. This restricts fluid flow speed locally, preventing rapid pressure changes that would disrupt movement stroke control while still allowing valve actuation
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 stabilizes the valve operation, prevents abnormal operations caused by rapid pressure changes, and improves the accuracy of proportional control, ensuring reliable leakproof sealability and enhanced control precision.
Implementation Method 1
a solenoid provided in the valve housing to surround the first space; a plunger configured to be rectilinearly moved in the flow path guide by the solenoid
Implementation Method 2
a spring member configured to provide elastic force to allow the valve member to move in a direction in which the valve member blocks the outlet flow path
Implementation Method 3
a pressure of the fluid by applying the elastic force of the spring member to the valve member and applying the pressure of the fluid supplied into the solenoid valve to the valve member
Data Source
AI summary
A solenoid valve includes a valve housing having a first space that communicates with an inlet flow path and a second space that communicates with an outlet flow path. A solenoid is provided in the valve housing to surround the first space. A flow path guide is provided in the first space and has an inflow path communicating with the first space. A plunger is rectilinearly moved in the flow path guide by the solenoid. A valve member is connected to the plunger and opens or closes the outlet flow path based on a plunger movement. A spring member provides elastic force allowing the valve member to move in a direction in which the valve member blocks the outlet flow path. A fluid guide part is formed in the plunger and guides a fluid, supplied into the inflow path via the first space, selectively to the second space.