Bolt-Connected Valve Core Structure to Prevent Axial Sliding Noise
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Solution Overview
Problem
The conventional valve core design with a bolt-connected valve stem and drive piece is prone to axial sliding due to gravity, leading to disconnection and resulting noise and reduced lifespan due to friction with the valve shell when the bolt piece rotates with the valve stem.
Innovation Solution
A valve core design featuring a hollow valve shell with a drive piece protruded through a convex cap, a sealing piece blocking the bolt piece to maintain connection and prevent friction with the valve shell, ensuring the bolt piece remains aligned and sealed, even under gravity, allowing smooth rotation of the drive piece.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the axial length of the bolt piece is increased to prevent falling apart, then the reliability is improved, but the bolt piece will rotate with the valve stem causing friction and noise with the valve shell
Solution Approach 1:
The guide hole in the convex cap serves as an intermediary structure that guides and constrains the bolt piece. The guide hole's axial direction is perpendicular to the gravity direction, creating a guide constraint that prevents the bolt piece from rotating with the valve stem during operation, thereby eliminating friction and noise while maintaining connection reliability.
2Ease of operation
If the bolt piece is used to connect valve stem and drive piece, then the ease of operation is improved, but the bolt piece may slide axially under gravity impact
Solution Approach 1:
The guide hole in the convex cap introduces a new dimensional constraint by orienting its axial direction perpendicular to the gravity direction. This dimensional change creates a guide constraint that effectively prevents axial sliding of the bolt piece under gravity impact, while still allowing the necessary rotation transmission function.
3Productivity
If the valve stem causes the drive piece to rotate through the bolt piece, then the functionality is improved, but the bolt piece will have relative friction with the valve shell causing noise
Solution Approach 1:
The guide hole acts as an intermediary constraint structure that allows the bolt piece to transmit rotation control from the valve stem to the drive piece while preventing the bolt piece from contacting and frictioning against the valve shell, thereby eliminating noise generation.
Data Source
AI summary
Disclosed is a valve core with bolt-connected valve stem and drive piece, including a valve shell, a valve stem, a drive piece, dynamic and static valve plates, and a valve seat. The drive piece valve plates are sequentially configured inside the valve shell. The valve seat is connected to the valve shell, and the static valve plate is connected to the valve seat. The valve plates are tightly overlapped. The drive piece is used to drive the dynamic valve plate to rotate, and is protruded with a hollow convex cap. The valve stem goes through the drive piece along the axial direction into the convex cap. A bolt piece goes through the valve stem and the convex cap along the radial direction, so that the valve stem and the drive piece are bolt-connected. A sealing piece is covered by the convex cap, and the sealing piece seals the bolt piece.