Pipe Joint Jaw Geometry and Coating to Prevent Scratches
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Solution Overview
Problem
Conventional pipe joint apparatuses cause scratches and corrosion due to surface contact between pipes and jaws, leading to potential leakage and loss of function under tensile force or water pressure, with inadequate corrosion resistance and hardness.
Innovation Solution
A pipe joint apparatus featuring a jaw with a chamfered part at a 30° angle, a tapered part with an inclination of 6 to 10°, and a multi-layer coating of zinc, copper, and nickel, which prevents surface contact scratches and enhances tensile force, corrosion resistance, and hardness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pipe is inserted into the conventional jaw at a right angle, then the pipe can be securely fixed, but the outer surface of the pipe is scratched and corrosion occurs
Solution Approach 1:
The chamfered part is formed in advance on the jaw blade to create a guide surface that prevents direct right-angle contact between the pipe and jaw. This preliminary geometric modification ensures that during pipe insertion, the pipe surface contacts only the chamfered guide surface rather than the blade edge, thereby preventing scratches and corrosion while maintaining secure fixing
Solution Approach 2:
The chamfered part acts as an intermediary element between the pipe and the jaw blade. It serves as a mediating surface that redirects the insertion force and prevents harmful direct contact, allowing the pipe to be guided smoothly into position without surface damage while still achieving the necessary fixation
2Reliability
If the jaw is made with conventional single-layer coating, then manufacturing is simple, but corrosion resistance and hardness are insufficient
Solution Approach 1:
The jaw employs a multi-layer coating system comprising a zinc base layer for corrosion protection, a copper intermediate layer for enhanced adhesion and corrosion resistance, and a nickel top layer for hardness and wear resistance. This composite coating structure synergistically combines the advantages of different materials to achieve superior overall performance while managing manufacturing complexity through systematic layer integration
3Ease of operation
If the jaw blade is positioned perpendicular to the pipe, then insertion is straightforward, but interference between jaw and pipe causes damage
Solution Approach 1:
The chamfered part is pre-formed on the jaw blade at a specific angle (e.g., 45 degrees) to create a guide surface that naturally directs the pipe during insertion. This preliminary angular modification maintains operational simplicity while preventing harmful interference by redirecting contact to the chamfered surface rather than the blade edge
Data Source
Figure 1-a~1-c
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AI summary
The present disclosure relates to a pipe joint apparatus including a jaw for pipe connection, which can provide one-touch attachment/detachment and insertion of a pipe, remove the interference between a pipe and a jaw, and improve a tensile force, corrosion resistance and hardness, compared to a conventional jaw. Provided is a pipe joint apparatus including an insertion part into which a pipe is inserted and a jaw which is mounted on a jaw holder, disposed to surround the circumference of the insertion part, and configured to fix the pipe by tightening the outer surface of the pipe. The jaw may include: a body part coupled to the jaw holder; a blade part provided on one side of the body part, and including a plurality of blades; a chamfered part provided at the front of the blade part, and chamfered at a predetermined angle; and a front surface part connected to the chamfered part, and formed perpendicular to the insertion direction of the pipe.