Proportional Relief Valve Needle Structure to Prevent Chattering
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Solution Overview
Problem
Solenoid proportional relief valves experience vibration (chattering) during operation, despite offering miniaturization, weight reduction, and simplified structure compared to conventional pilot selector type relief valves.
Innovation Solution
A solenoid proportional relief valve design featuring a valve body and valve seat configuration with a movable needle, a coil, stator, and biasing member, where the needle is formed as a bottomed cylinder with a biasing member accommodation space, and a mass ratio of the needle to valve body is set at 30 times or more, along with a holding member to adjust resilient force, and a bush with a specific axial length ratio, to prevent vibration and ensure stable pressure control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a solenoid proportional relief valve is used instead of a conventional pilot selector type relief valve, then miniaturization, weight reduction, and simplified structure are achieved, but vibration (chattering) occurs during operation
Solution Approach 1:
The patent changes the mass parameter of the needle by forming it as a bottomed cylinder with a specific structure. The needle's mass is increased relative to conventional designs, which suppresses vibration during valve operation while maintaining the simplified solenoid proportional structure. This parameter change resolves the contradiction between structural simplicity and operational stability.
2Reliability
If the needle mass is increased to prevent vibration, then operational stability improves, but the weight reduction benefit is compromised
Solution Approach 1:
The biasing member is nested within the bottomed cylinder structure of the needle, allowing the needle to accommodate the biasing member in its hollow interior. This nesting arrangement optimizes the mass distribution and structural efficiency, enabling vibration suppression through increased needle mass while minimizing the overall weight increase by efficiently utilizing the internal space of the needle structure.
3Ease of manufacture
If the valve body and valve seat are formed separately, then manufacturing flexibility is improved, but assembly complexity and potential misalignment increase
Solution Approach 1:
The valve body is formed integrally with the outer surface of the bottom portion of the needle, creating a unified structure. This merging of the valve body and needle into a single integral component eliminates assembly complexity and potential misalignment issues between separate parts, while the integral formation ensures precise alignment and reduces manufacturing steps.
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 design prevents vibration during operation, enabling stable and accurate pressure control while maintaining miniaturization, weight reduction, and simplified structure.
Implementation Method 1
a coil wound to be energized; a stator generating an attraction force acting on the needle by excitation of the coil
Implementation Method 2
a biasing member accommodation space accommodating a biasing member in a state in which a resilient force is generated
Data Source
AI summary
A solenoid proportional relief valve includes: a joint in which the flow path is disposed; a coil wound to be energized; a needle supported movably along an axial direction of the coil; and a stator generating an attraction force on the needle by excitation of the coil, the needle being formed into a bottomed cylinder having a wall portion and a bottom portion and configured as a biasing member accommodation space accommodating a biasing member in a state where a resilient force is generated in an inner cylindrical portion, an inner surface of the bottom portion being configured as a force receiving section for the biasing member, and the valve body being formed integrally with an outer surface of the bottom portion.