Force-Compensated Rotary Valve Line for Pulse Tube Cooler Vibration Isolation
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Solution Overview
Problem
Pulse tube cooler systems for NMR equipment face challenges in suppressing both high-frequency vibrations from the control valve and low-frequency vibrations due to pressure fluctuations, while maintaining a compact design, as existing solutions either fail to isolate vibrations effectively or result in an expansive design.
Innovation Solution
A pulse tube cooler system with a connecting device featuring two flexible line segments arranged parallel and offset, which are connected in a way that opposes mechanical forces caused by pressure fluctuations, ensuring no continuous rigid connection between the control valve and the cold head, allowing for effective isolation of high-frequency vibrations and compensation of low-frequency vibrations without increasing the system's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a flexible line segment is used in the connecting device to isolate high-frequency vibrations, then vibration isolation is improved, but the system size becomes expansive
Solution Approach 1:
The connecting device is divided into two separate line segments arranged in parallel. Each line segment handles pressure fluctuations independently, allowing for compact arrangement while maintaining vibration isolation capabilities. The segmentation enables the system to achieve effective vibration suppression without requiring excessive length in a single flexible segment.
Solution Approach 2:
The two line segments are arranged offset across the longitudinal direction, utilizing spatial arrangement in multiple dimensions. This parallel offset configuration allows the segments to compensate for each other's vibrations through vectorial cancellation while maintaining a compact overall footprint, avoiding the need for excessive linear length.
2Volume of moving object
If the connecting device is made compact, then system size is reduced, but vibration isolation effectiveness deteriorates
Solution Approach 1:
The two line segments are merged into a parallel configuration where both segments are connected to the same cold head and control valve. This merging allows the segments to work together in unison, with their offset arrangement creating opposing vibration vectors that cancel each other out, achieving effective vibration isolation in a compact package.
Solution Approach 2:
The offset parallel arrangement of the two line segments creates a counterbalancing effect where vibrations from one segment are compensated by the other. The segments act as mechanical counterweights to each other, with their opposing orientations causing vibration forces to cancel out, thereby isolating high-frequency vibrations without requiring excessive length.
3Object-affected harmful factors
If line segments are arranged in opposition on a line to compensate pressure pulses, then low-frequency vibration compensation is improved, but the design becomes expansive and non-compact
Solution Approach 1:
Instead of arranging line segments in opposition along a single linear axis (which would be expansive), the invention offsets the parallel line segments across the longitudinal direction. This dimensional change allows the segments to maintain their vibration-compensating oppositional arrangement while occupying a more compact three-dimensional space, suitable for integration into NMR equipment.
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 isolates high-frequency vibrations by over 100 times and compensates low-frequency vibrations, maintaining a compact design suitable for NMR equipment, reducing mechanical interference and enhancing measurement resolution.
Implementation Method 1
The flexible line segments are arranged parallel to one another and are offset relative to one another across the longitudinal direction of the flexible line segments... effectively isolates high-frequency vibrations by over 100 times
Implementation Method 2
the flexible line segments are arranged parallel to one another and are offset relative to one another across the longitudinal direction of the flexible line segments... compensates low-frequency vibrations
Data Source
AI summary
A connecting device in a pulse tube cooler system branches such that a first line branch (11) has a first flexible line segment (4a) and a second line branch (12) has a second flexible line segment (4b), the flexible line segments being arranged in parallel with and offset from one another. The flexible line segments each have a front segment end (17, 18) and a rear segment end (19, 20), the front segment end (17) of the first flexible line segment (4a) and the rear segment end (20) of the second flexible line segment (4b) are rigidly connected to one another, the rear segment end (19) of the first flexible line segment (4a) and the front segment end (18) of the second flexible line segment (4b) are rigidly connected to one another, and there is no continuous rigid connection between the control valve and the cold head.