Position-measuring device with counter-flow cooling
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Solution Overview
Problem
Existing position-measuring devices face reduced accuracy due to non-homogeneous temperature distribution of the cooling medium flowing through their passages, affecting the cooling of the scale and subsequently the precision of position measurements.
Innovation Solution
The design incorporates a housing with interconnected cooling passages that redirect fluid flow in opposite directions through a connecting channel, ensuring a homogeneous temperature distribution along the scale, thereby enhancing cooling efficiency and measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling passages are provided in the housing, then cooling of the scale is achieved, but the temperature distribution of the cooling medium becomes non-homogeneous over the length of the scale
Solution Approach 1:
The patent applies the inversion principle by redirecting the cooling medium flow direction using connecting channels. Instead of allowing the cooling medium to flow linearly through passages, the connecting channels invert the flow direction at specific sections, creating a counter-current flow pattern that equalizes temperature distribution along the scale length.
Solution Approach 2:
The patent changes the flow parameters of the cooling medium by introducing connecting channels that alter the flow path and direction. This modifies the temperature profile of the cooling medium as it progresses through the passages, ensuring more uniform heat extraction along the entire scale length.
2Temperature
If multiple passages are used for cooling, then cooling coverage is improved, but temperature distribution remains non-homogeneous
Solution Approach 1:
The connecting channels invert the flow direction in the second passage relative to the first passage, creating a counter-current flow arrangement. This inversion ensures that the cooling medium in both passages experiences similar temperature gradients, achieving homogeneous temperature distribution across all passages.
3Temperature
If cooling passages are added to the housing, then scale cooling is enabled, but device complexity increases
Solution Approach 1:
The patent merges the cooling function into the existing housing structure by integrating passages and connecting channels directly into the housing. This combining approach achieves effective cooling without adding separate cooling components, thereby limiting the increase in device complexity.
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
This configuration achieves accurate position measurements by maintaining a consistent temperature distribution, improving the cooling effectiveness and maintaining measurement precision in the longitudinal direction of the scale.
Implementation Method 1
The position-measuring device has a connecting channel, the first and second passages being interconnected via the connecting channel
Implementation Method 2
a temperature distribution of a cooling medium flowing through the passages is not homogeneous over the length of the scale. Therefore, it is not possible to achieve optimum cooling of the scale
Data Source
AI summary
A position-measuring device includes a housing having a first portion in the form of a hollow section and extending in a longitudinal direction. The housing includes at least a first passage and a second passage, the first and second passages each extending in the longitudinal direction at least partially through the first portion. A scale is disposed within the housing for being scanned as part of a position measurement. The position-measuring device includes a connecting channel, the first and second passages being interconnected via the connecting channel.