Compact Pipe Joint Sealing With Radial Overlap Locking
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Solution Overview
Problem
Conventional pipe joints increase the size of the socket and pipe joint in the pipe-axial direction due to the placement of the spigot protrusion part away from the sealing member, leading to a larger overall size and potential leakage issues.
Innovation Solution
A pipe joint configuration where the sealing member is provided along the outer circumferential surface of the spigot protrusion part, allowing it to overlap with the spigot protrusion part in the pipe-radial direction, and a separation preventive member with a thinner engaging part is used to prevent separation, reducing the length of the pipe joint in the pipe-axial direction and enhancing sealing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spigot protrusion part is provided away from the sealing member in the separation direction, then the sealing performance is improved and separation prevention is enhanced, but the length of the pipe joint in the pipe-axial direction increases
Solution Approach 1:
The sealing member is configured to extend not only in the pipe-axial direction but also in the pipe-radial direction along the outer circumferential surface of the spigot protrusion part. This multi-dimensional arrangement allows the sealing member to contact the spigot protrusion part effectively without requiring additional axial length, thus resolving the contradiction between sealing performance and compactness.
Solution Approach 2:
The sealing member is positioned to overlap with the spigot protrusion part in the pipe-radial direction, creating a nested configuration where the sealing member wraps around the protrusion part. This nesting allows the sealing function to be achieved within the existing axial space, preventing leakage without increasing the overall length of the pipe joint.
2Reliability
If the spigot protrusion part is provided away from the sealing member, then separation prevention is enhanced, but the overall size of the pipe joint increases
Solution Approach 1:
The separation preventive member utilizes the pipe-radial dimension by engaging with the spigot protrusion part that extends along the outer circumferential surface. This radial engagement allows separation prevention without requiring additional axial space, thus preventing increase in overall pipe joint volume.
Solution Approach 2:
The spigot protrusion part is provided with varying thickness along the pipe-axial direction, being thicker at the leading end and thinner toward the rear. This local variation in quality allows the protrusion part to provide sufficient engagement area for separation prevention while maintaining a compact overall size.
3Reliability
If a conventional separation preventive member is used, then separation prevention is achieved, but the force required for expanding the member is large
Solution Approach 1:
The separation preventive member is configured with varying thickness, being thinner at the engaging part that contacts the spigot protrusion part and thicker at the body part. This local quality variation reduces the force required for expansion at the critical engagement area while maintaining sufficient strength in the body part.
Solution Approach 2:
The thickness parameter of the separation preventive member is changed along its structure, with the engaging part having a smaller thickness than the body part. This parameter change allows easier expansion and installation while maintaining the necessary mechanical strength for separation prevention.
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 configuration reduces the pipe joint's size in the pipe-axial direction, prevents leakage, and ensures secure connection even under separation forces like earthquakes, while simplifying the pipe connection process by reducing the force required for expanding the separation preventive member.
Implementation Method 1
a compression part sandwiched between the outer circumferential surface of the spigot and the inner circumferential surface of the socket, the compression part being compressed in a pipe-radial direction
Implementation Method 2
a separation preventive member configured to engage with the spigot protrusion part in a pipe-axial direction so as to prevent a separation of the spigot from the socket
Data Source
AI summary
A pipe joint includes: a sealing member, having an annular shape, which is provided between the outer circumferential surface of a spigot and an inner circumferential surface of a socket; a pushing ring to push the sealing member into the socket, the pushing ring being fitted onto the spigot; and a separation preventive member configured to engage with the spigot protrusion part in a pipe-axial direction to prevent a separation of the spigot from the socket. The separation preventive member is provided between an inner circumferential surface of the pushing ring and the outer circumferential surface of the spigot. The sealing member is provided along an outer circumferential surface of the spigot protrusion part and includes a compression part. The compression part is compressed in a pipe-radial and is located, in the socket, upstream of the spigot protrusion part in an insertion direction in which the spigot is inserted.