Motor-Operated Valve Rotor Biasing to Reduce Vibration Noise
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Solution Overview
Problem
Conventional motor-operated valves experience vibration issues due to rotor-stator rattling, resulting in unwanted noise.
Innovation Solution
A motor-operated valve design featuring a linear-motion shaft supported by a base portion, a valve member that opens and closes a port, and a rotor biasing mechanism using tapered surfaces to ensure proper alignment and contact between the rotor and stator, reducing vibration by centering the rotor and applying pressure to prevent rattling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a motor is used to drive the linear-motion shaft, then the valve can be operated automatically, but rotor-stator rattling causes vibration noise
Solution Approach 1:
A damping member is introduced as an intermediary element between the rotor and stator. This damping member absorbs and reduces the vibration energy generated by rotor-stator interaction, thereby eliminating the harmful noise while preserving the automatic operation capability of the motor-driven valve
Solution Approach 2:
The vibration and noise generated by rotor-stator rattling are converted into a beneficial damping effect. The damping member transforms the harmful vibration energy into heat through internal friction, thereby reducing noise while maintaining the motor's driving function
2Ease of operation
If the rotor is allowed to rotate freely, then the motor operation is smooth, but the rotor rattles relative to the stator causing vibration
Solution Approach 1:
The damping member serves as a mediator between the rotor and stator, allowing the rotor to rotate smoothly while simultaneously preventing harmful rattling. The damping material absorbs impact forces and reduces vibration during rotor rotation, eliminating noise without restricting motor operation
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 effectively reduces vibration noise by ensuring precise alignment and contact between the rotor and stator, enhancing the operational stability and quietness of the motor-operated valve.
Implementation Method 1
a rotor biasing means which biases the rotor in the rotation axis direction such that the first contacting portion and the second contacting portion are pressed onto each other
Implementation Method 2
a linear-motion shaft which is screwed into a rotor of the motor and which is supported by the base portion such that the linear-motion shaft can be moved linearly
Data Source
AI summary
A motor-operated valve includes a base portion which is provided at one end of a stator, a linear-motion shaft which is screwed into a rotor and which is supported by the base portion such that the linear-motion shaft can be moved linearly and cannot be rotated, and a valve member which is provided in the linear-motion shaft and which opens and closes the valve port. A first contacting portion on the rotor and a second contacting portion on the stator or an intermediate member disposed between the rotor and the stator, the first and the second contacting portions and being provided in each of the intermediate member or the stator and the rotor, and contacting with each other in the rotation axis direction of the rotor are biased by a rotor biasing means such that they are pressed onto each other.