Hydrant Riser Pipe Threading for Precise Height Adjustment
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Solution Overview
Problem
Existing hydrants face challenges in precisely and easily adjusting the height of the upper part relative to the riser pipe casing.
Innovation Solution
The implementation of threaded areas on the riser pipe, extending longitudinally and circumferentially, allows for precise height adjustment through a combination of threaded and unthreaded segments, enabling both coarse and fine adjustments with minimal rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a threaded area is provided on the riser pipe for height adjustment, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The threaded area is divided into multiple thread segments arranged circumferentially around the riser pipe. Each thread segment can independently engage with the threaded engagement, allowing the adjustment mechanism to be distributed across multiple locations rather than requiring a single complex threading arrangement.
Solution Approach 2:
The threaded area extends only over a partial circumference of the riser pipe rather than the full 360 degrees. This partial threading provides sufficient adjustment capability while reducing the overall complexity of the threading structure and allowing for simpler manufacturing.
2Measurement precision
If the threaded area extends over the entire circumference, then the measurement precision is improved, but the loss of time increases
Solution Approach 1:
The threaded area is segmented into multiple discrete thread segments around the circumference. The threaded engagement can engage with any of these segments, providing precise height positioning without requiring rotation through the entire circumference. This segmentation allows the adjustment to be completed in fewer rotational steps.
Solution Approach 2:
The multiple thread segments are arranged periodically around the circumference at different angular positions. As the riser pipe rotates, the threaded engagement sequentially passes these periodically arranged segments, allowing the operator to achieve precise height adjustment by engaging with the appropriate segment rather than rotating through a full 360-degree threaded area.
3Manufacturing precision
If the thread segments extend over a large arc segment, then the manufacturing precision is improved, but the device complexity increases
Solution Approach 1:
Instead of providing a single continuous threaded area spanning a large arc, the threading is segmented into multiple discrete thread segments distributed around the circumference. Each individual thread segment can be manufactured with standard precision, and the cumulative effect of multiple segments provides the overall precision needed without requiring any single segment to be excessively long or complex.
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 design facilitates easy and precise height adjustment of the riser pipe relative to the riser pipe shell, enhancing usability and adaptability to varying ground levels.
Implementation Method 1
a rotation of the riser pipe with the at least one threaded area and the at least one threaded engagement relative to each other enables a height setting of the riser pipe relative to the riser pipe shell
Data Source
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AI summary
A hydrant (10) comprising an upper part (14) provided with at least one connection (16) and a lower part (22) which has a connection (24) for an inlet pipe (26), a riser pipe casing (42) and a riser pipe (44) guided in the riser pipe casing (42) and supporting the upper part (14), which is movable out of the riser pipe casing (42) and can be positioned at different heights relative to the riser pipe casing (42), characterized in that at least one threaded area (52a, b) extending in a strip shape both in the longitudinal direction (L) and in the circumferential direction (U) of the riser pipe (44) is arranged on its outer circumferential side (50), that at least one threaded engagement (76) held on the riser pipe casing (42) engages in the at least one threaded area (52a, b) to determine a height setting of the riser pipe (44) relative to the riser pipe casing (42), and that a Twisting the riser pipe (44) with the at least one threaded section (52a,b) and the at least one threaded engagement (76) relative to each other enables a height adjustment of the riser pipe (44) relative to the riser pipe shell (42).