Fluid Control Valve Tilt Restraining Spring Design
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Solution Overview
Problem
Fluid control valves in mass flow controllers experience tilting and vibration due to fluid pressure, leading to errors in valve open degree adjustment, noise generation, and potential abrasion or breakage of components.
Innovation Solution
Incorporation of a tilt restraining spring that biases the valve body to prevent tilting, combined with a valve body return spring to maintain accurate positioning and reduce vibration, while keeping the valve body separate from the valve chest to prevent contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the valve body is arranged close to the valve chest inner surface to prevent contamination, then fluid contamination is reduced, but the valve body tilts and vibrates due to fluid pressure
Solution Approach 1:
A tilt restraining spring is introduced as an intermediary component between the valve body and the valve chest. This spring applies a restraining force that counteracts the tilting moment caused by fluid pressure, thereby preventing valve body tilt and vibration while maintaining the space between the valve body and valve chest inner surface that prevents fluid contamination.
2Stability of the object's composition
If the valve body is biased by spring force to maintain positioning, then valve body stability is improved, but resonance may occur at certain frequencies
Solution Approach 1:
The natural frequency of the valve body is adjusted by changing the spring constant of the tilt restraining spring and/or the valve body return spring. By optimizing these spring constants, the natural frequency is shifted away from the operating frequency range, preventing resonance while maintaining stable valve body positioning through spring biasing forces.
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 solution effectively stabilizes the valve body, ensuring precise control of fluid flow, reducing noise and component wear, and preventing fluid contamination by allowing for separate design of spring constants and increased natural frequency to avoid resonance.
Implementation Method 1
a tilt restraining spring that is configured to bias the valve body in a direction of resolving a tilt of the valve body to an open/close direction
Implementation Method 2
a valve body return spring that is configured to bias the valve body in a direction of closing the valve
Implementation Method 3
an actuator that is configured to bias the valve body in a direction of opening the valve
Data Source
AI summary
An object of this invention is both to prevent contamination of a fluid passing a fluid control valve and to prevent a tilt of a valve body in a moving direction and vibration of the valve body. The fluid control valve comprises a valve body that is arranged on an inner surface of a valve chest through a predetermined space in the valve chest and that is arranged on a valve seat arranged in the valve chest in a detachable manner, an actuator that biases the valve body in a direction of opening the valve, a valve body return spring that biases the valve body in a direction of closing the valve, and a tilt restraining spring that biases the valve body in a direction of resolving a tilt of the valve body to an open/close direction.