Multi-Start Screw Coupling Assembly for Quick High-Pressure Sealing
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Solution Overview
Problem
Existing screw couplings for high-pressure cleaning devices require time-consuming and difficult handling to establish and loosen liquid-tight connections due to single-start threads with small pitch angles, which are often self-locking but require multiple revolutions, making them inefficient for quick connection and disconnection.
Innovation Solution
A multi-start thread configuration with a clamping element is used, allowing a large axial movement with a single rotation and preventing unintentional separation, while a dirt-receiving space keeps the connection clean and the clamping elements jam to ensure the connection remains secure without being self-locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-start thread with small pitch angle is used, then the connection is self-locking and reliable, but multiple revolutions are required to tighten and loosen the connection, making it time-consuming and difficult to handle
Solution Approach 1:
The patent changes the thread configuration from single-start to multi-start (specifically 2-start or more), which fundamentally alters the thread geometry parameters. This allows the connection to be tightened and loosened in fewer revolutions while maintaining reliability through the combination of multi-start thread with clamping elements that provide anti-loosening protection
2Loss of time
If a multi-start thread with large pitch is used, then the connection can be tightened and loosened quickly with fewer revolutions, but the connection may unintentionally detach under high pressure
Solution Approach 1:
The patent merges two different locking mechanisms into a single connection system: the multi-start thread provides quick connection capability, while clamping elements (such as bayonet clamps or cam locks) provide anti-loosening protection. This combination allows the connection to be both quick to establish and secure against unintentional detachment under high pressure
Solution Approach 2:
The connection mechanism uses a composite approach combining thread engagement with additional clamping elements, creating a hybrid locking system that leverages the advantages of both mechanisms while mitigating their individual disadvantages
3Reliability
If multiple revolutions are required to tighten the connection, then the thread engagement is secure, but the handling becomes complicated and inefficient
Solution Approach 1:
The patent modifies the thread parameters by using multi-start configuration, which reduces the number of revolutions needed for full engagement. This parameter change, combined with self-locking features or clamping elements, maintains engagement security while significantly improving handling ease and operational efficiency
Data Source
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AI summary
The invention relates to a coupling arrangement (12, 14, 82, 84, 152, 156) for a screw coupling (10, 80, 150) for liquid lines of a high-pressure cleaning device. The coupling arrangement (12, 14, 82, 84, 152, 156) has a plug-in part (16, 48, 86, 106, 154, 158) which can be plugged into a complementary plug-in part of a second coupling arrangement of the screw coupling (10, 80, 150) to create a liquid-tight and detachable connection with the interposition of a sealing ring (28, 90, 162), as well as a connecting part (38, 51, 92, 124, 164, 192) with a thread (50, 52, 96, 132, 168, 196) which can be screwed into a complementary thread of the second coupling arrangement.In order to quickly and fluid-tightly connect the coupling arrangement (12, 14, 82, 84, 152, 156) to the second coupling arrangement, ensuring that the connection does not unintentionally loosen, it is proposed that the thread (50, 52, 96, 132, 168, 196) be designed with multiple starts and that the connecting part (38, 51, 92, 124, 164, 192) have a clamping element (56, 60, 100, 128, 172, 200) arranged in alignment with the thread (50, 52, 96, 132, 168, 196) with respect to the longitudinal axis (63, 134, 202), which engages with a complementary clamping element of the second coupling arrangement by axially interlocking It can be detached and jammed.