Torsion-Proof Hose Connection via Asymmetric Compression Sleeve
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Solution Overview
Problem
Existing fluid-conveying systems face issues with hose-nipple connections that are compromised by torsional moments due to mechanical stresses from movements, vibrations, and temperature changes, leading to potential loosening and seal impairment, especially under high fluid pressures.
Innovation Solution
A connecting method featuring a non-twistable connection between a nipple and a compression sleeve with a positive-locking anti-twist section, where the anti-twist section on the nipple and the compression sleeve have complementary non-circular forms, creating a torsion-proof toothing that prevents twisting and allows for easy assembly without rotational alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a compression sleeve connection is used to secure the hose on the nipple, then the connection is simple and widely accepted, but the connection becomes compromised under torsional moments leading to loosening and seal impairment
Solution Approach 1:
The patent applies asymmetry by providing the nipple with a non-circular anti-twist section (square, rectangular, or polygonal cross-section) that prevents rotational movement. This asymmetric geometry creates a positive-locking engagement with the compression sleeve, eliminating the harmful torsional effects that plague conventional circular connections while maintaining assembly simplicity.
Solution Approach 2:
The patent implements preliminary action by pre-forming the anti-twist section on the nipple during manufacturing, so that when the compression sleeve is assembled, the anti-rotation capability is already in place. This eliminates the need for additional anti-rotation components or complex assembly steps, resolving the contradiction between simplicity and reliability.
2Strength
If the hose wall is made stiffer to endure greater fluid pressures, then the pressure endurance increases, but the counter-torque from slight rotations increases, stressing the connection site
Solution Approach 1:
The non-circular anti-twist section creates asymmetric engagement surfaces that prevent the hose from rotating relative to the nipple. This eliminates the generation of counter-torque that would otherwise occur with stiff hose walls under pressure, allowing the system to withstand high pressures without compromising the connection.
Solution Approach 2:
The patent applies preliminary anti-action by pre-configuring the anti-twist section to counteract any potential rotational forces before they can damage the connection. The geometric constraint prevents torsional movement from developing, thereby neutralizing the harmful counter-torque effect before it can stress the connection site.
3Reliability
If a non-circular anti-twist section is provided on the nipple with a compression sleeve, then torsional moments are prevented, but the assembly requires rotational alignment between components
Solution Approach 1:
The patent resolves the alignment issue by pre-forming the anti-twist section on the nipple during manufacturing, creating a self-aligning feature. The compression sleeve is designed with a corresponding non-circular interior form that automatically engages with the pre-formed anti-twist section, eliminating the need for precise rotational alignment during assembly.
Solution Approach 2:
The design enables self-alignment during assembly, where the non-circular geometry of the anti-twist section and compression sleeve automatically orient themselves correctly as they are pushed together. This self-service mechanism eliminates the need for operators to perform rotational alignment, maintaining ease of operation while achieving torsion-proof connection.
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 method provides a mechanically stable connection that remains secure under torsional stress, ensuring a permanent seal and preventing loosening, even under increased fluid pressures, by forming a torsion-proof toothing through plastic deformation during assembly.
Implementation Method 1
the compression sleeve is compressed in radially inward direction, so that its ribs are pressed into the hose and thus tightly secure said house in axial direction
Implementation Method 2
The positive connection between the nipple and the compression sleeve is formed by an anti-twist section provided on the nipple and by a correspondingly formed section of the compression sleeve
Data Source
Figure 1~4
Figure 5~6
AI summary
In order to establish a connection that can be stressed by rotation between a nipple (3) and a hose (2), a connecting device (1) is used, said device comprising a compression sleeve (4). Said compression sleeve is compressed with the nipple (3) in a non-circular manner at least at one point, so that the compression sleeve (4) and the nipple (3) are secured and connected to each other in a torsion-proof positive-locking manner. In contrast, the section (15) of the compression sleeve (4) comprising the hose (2) is preferably compressed in a circular manner, so that the hose (2) is seated - with uniform compression along its circumference - on the hose-receiving section (9) of the nipple (3).