Pipe Drilling Valve Seat Shielding Against Chip Contamination
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Solution Overview
Problem
The existing pipe drilling devices face issues with chips generated during drilling entering the recessed valve seat portion of the neck portion, leading to impaired sealing performance due to interference with the process valve body, particularly in recessed valve seat designs.
Innovation Solution
A pipe drilling device with a cylindrical portion that is movable to open and close the recessed valve seat portion, preventing chips from entering and ensuring the process valve body contacts a clean surface, along with a seal component to maintain an uninterrupted flow state and a discharge port for chip removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a recessed valve seat portion is formed in the inner surface of the neck portion to improve adhesion with the process valve body, then sealing performance is enhanced, but chips generated during drilling are likely to stay in the recessed portion and impair sealing performance
Solution Approach 1:
A cylindrical portion is introduced as an intermediary component between the drilling machine and the recessed valve seat portion. This cylindrical portion temporarily closes the opening of the recessed valve seat portion during drilling operations, preventing chips from entering the recessed space while allowing the drilling process to proceed. The cylindrical portion acts as a protective barrier that mediates between the chip-generating drilling process and the chip-sensitive valve seat area.
Solution Approach 2:
The cylindrical portion is positioned and secured in place before the drilling operation begins. This preliminary action ensures that the opening of the recessed valve seat portion is already closed and protected before chips are generated. The cylindrical portion is then removed after drilling is complete, allowing the process valve body to be installed and make proper contact with the clean valve seat surface.
2Object-affected harmful factors
If the cylindrical portion is made movable to open and close the recessed valve seat portion, then chip entry is prevented, but device complexity increases
Solution Approach 1:
The cylindrical portion is designed with movable capability, allowing it to transition between closed and open positions relative to the recessed valve seat portion opening. This dynamic design enables the cylindrical portion to adapt to different operational phases: closed during drilling to prevent chip entry, and open during valve installation to allow proper assembly. The movability is achieved through simple mechanical means that add minimal complexity while providing effective chip protection.
Data Source
AI summary
A pipe drilling device includes a casing having a divided structure and externally fitted to a fluid pipe in a sealed manner, a process valve including a process valve body that comes into contact with and separates from a recessed valve seat portion provided inside a neck portion of the casing, a drilling machine including a cutter that is inserted into the casing and configured for drilling the fluid pipe in an uninterrupted flow state, and a cylindrical portion that is movable to open and close an opening of the recessed valve seat portion inside the neck portion.