Motor-Operated Valve Shaft Stabilization for Low Vibration Noise
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Solution Overview
Problem
Conventional motor-operated valves experience vibration-induced noise due to rattling of the linear-motion shaft relative to the stator.
Innovation Solution
Incorporation of a Teflon sheet as an elastic member that contacts the outer circumferential surface of the linear-motion shaft, regulating its movement in the radial direction and preventing rattling, combined with bearings and a wave washer to prevent rotor movement, thereby reducing vibration noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a linear-motion shaft is used to drive the valve member, then the valve can be operated effectively, but the linear-motion shaft rattles relative to the stator producing vibration noise
Solution Approach 1:
A buffer member is introduced as an intermediary component between the linear-motion shaft and the stator. This buffer member absorbs the rattling movements and prevents direct contact that causes vibration noise, while still allowing the linear-motion shaft to function properly in driving the valve member.
Solution Approach 2:
The buffer member is pre-installed in the stator to prevent rattling before operation begins. By providing preliminary support and constraint, the buffer member prevents the linear-motion shaft from making rattling contact with the stator during normal operation, thereby eliminating vibration noise at the source.
2Object-generated harmful factors
If the linear-motion shaft is constrained radially to prevent rattling, then vibration noise is reduced, but the movement and operation of the shaft may be restricted
Solution Approach 1:
The buffer member provides radial constraint only at specific locations where rattling occurs, while leaving other areas of the linear-motion shaft free to move as needed for valve operation. This localized support approach prevents vibration noise without restricting the necessary movement freedom of the shaft.
Solution Approach 2:
The buffer member is designed to be dynamically responsive, providing constraint when rattling occurs but allowing free movement during normal operational cycles. This dynamic characteristic enables the system to maintain both low vibration noise and adequate shaft movement freedom simultaneously.
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 reduces vibration noise by stabilizing the linear-motion shaft and rotor, enhancing the operational silence and assembly efficiency of the motor-operated valve.
Implementation Method 1
an elastic member which is provided in the valve body and which contacts with the outer circumferential surface of the linear-motion shaft and regulates the movement of the linear-motion shaft in a radial direction
Data Source
AI summary
A motor-operated valve includes a motor, a linear-motion shaft which receives power of the motor and is linearly moved and which includes a valve member that opens and closes a valve port formed at an end of a valve body, and an elastic member which is provided in the valve body and which contacts with an outer circumferential surface of the linear-motion shaft and regulates the lateral movement of the linear-motion shaft.