Valve Casing Packing Structure to Prevent Seal Detachment
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Solution Overview
Problem
The existing valve devices face issues with the detachment of inner packings from the inner valve casing when housed in the outer valve casing, leading to compromised sealing performance between the two casings.
Innovation Solution
The inner packing is designed with a connecting portion that links the U-shaped portions, preventing detachment by ensuring they remain firmly connected, especially on the bottom surface of the inner valve casing, and the connecting portion is thinner to avoid interrupting the enclosed space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inner packing is designed with U-shaped portions extending downward from the annular portion, then the sealing performance can be easily checked, but the inner packing may be detached from the inner valve casing due to contact resistance
Solution Approach 1:
The inner packing is divided into multiple U-shaped portions that are separated yet connected, allowing each portion to independently contact the inner valve casing while maintaining overall structural integrity through the connecting portion
Solution Approach 2:
The connecting portion merges the multiple U-shaped portions into a unified structure, ensuring they move together as one unit and preventing detachment while maintaining the sealing function
2Reliability
If the inner packing contacts the inner surface of the outer valve casing to ensure sealing, then sealing performance is improved, but the inner packing is likely to be easily detached due to contact resistance
Solution Approach 1:
The inner packing is designed to dynamically adapt during assembly, allowing the U-shaped portions to flex and contact the inner valve casing surface while the connecting portion maintains structural cohesion to prevent detachment
3Volume of stationary object
If the connecting portion is made thinner, then the enclosed space is not interrupted, but the connecting portion may be weaker
Solution Approach 1:
The connecting portion is designed as a thin, flexible structure that maintains sufficient strength to connect the U-shaped portions while minimizing intrusion into the enclosed space, allowing it to bend and adapt without breaking
Data Source
AI summary
A valve device has an outer valve casing externally fitted to an existing fluid pipe, an inner valve casing housed in the outer valve casing and an inner packing for sealing a gap between them. The inner packing includes an annular portion mounted along a periphery of an upper side surface of the inner valve casing and a plurality of U-shaped portions extending downward from the annular portion and to be mounted over an entire length from a side surface to a bottom surface of the inner valve casing. An enclosed space sandwiched between an inner surface of the outer valve casing and an outer surface of the inner valve casing is formed between the U-shaped portions that are adjacent to each other. The inner packing is provided with a connecting portion for connecting the plurality of U-shaped portions to one another.