Offset Ball Check Valve Geometry for Quieter Diaphragm Pumps
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Solution Overview
Problem
Existing diaphragm pumps, particularly air-operated double diaphragm (AODD) pumps, face issues such as cavitation, noise pollution, and reduced lifespan due to the rapid acceleration and deceleration of fluid, which leads to erosion of ball check valve components and guidance finger structures, especially when handling viscous or solids-laden liquids.
Innovation Solution
The design incorporates a ball check valve with a sealing ring and a ball where the ball's central axis is offset from the longitudinal axis in the unseated position, reducing jostling and erosion, and an elongated valve inlet portion with a smaller sealing ring diameter to enhance sealing and reduce noise, along with an angled guidance finger structure to guide the ball efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ball check valve with guidance finger structures is used to control fluid flow, then the ball can be confined to a specific region for efficient seating and unseating, but the rapid fluid flow causes the ball to jostle and continuously collide with the guidance finger structures, resulting in noise pollution and erosion
Solution Approach 1:
The patent introduces an offset between the ball check valve axis and the guidance finger structures. The guidance fingers are positioned asymmetrically relative to the ball's central axis, creating an offset configuration that prevents the ball from directly colliding with the guidance fingers during operation, thereby reducing noise and erosion while maintaining seating efficiency
Solution Approach 2:
The patent introduces an intermediary offset region between the ball and guidance finger structures. This offset acts as a mediator that allows the ball to move freely without direct contact with the guidance fingers, eliminating the harmful collisions while still maintaining proper valve seating through the offset geometry
2Productivity
If the ball check valve operates with rapid acceleration and deceleration of fluid, then fluid flow control is effective, but cavitation occurs that reduces fluid capacity and causes wear to pump components
Solution Approach 1:
The offset configuration of the ball check valve creates asymmetric flow paths that reduce abrupt pressure changes during valve operation. This asymmetric geometry allows for smoother fluid acceleration and deceleration, minimizing cavitation events that would otherwise cause component wear while maintaining effective flow control
3Adaptability or versatility
If flowable solids are present in the pumped liquid, then the pump can handle solids-laden liquids, but the solids get trapped between the guidance finger structures and the ball, worsening erosion
Solution Approach 1:
The offset configuration creates an intermediary space between the ball and guidance finger structures. This offset region prevents solids from being trapped in the narrow gap between the ball and guidance fingers, eliminating a major source of erosion while maintaining the pump's ability to handle solids-laden liquids
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
This configuration reduces noise pollution, extends the lifespan of the pump components, and improves operational efficiency by minimizing cavitation and wear, potentially eliminating the need for ear protection for operators and enhancing fluid flow predictability.
Implementation Method 1
The ball check valve may comprise a sealing ring arranged over the valve inlet portion... A ball check valve may also comprise a ball arranged over the sealing ring
Implementation Method 2
Operation of a pump leads to rapid acceleration and deceleration of the fluid being pumped and results in corresponding changes in pressure
Implementation Method 3
The sealing ring has an inner diameter that is smaller than an inner diameter of the valve inlet portion... The diameter of the ball may be greater than the inner diameter of the sealing ring
Data Source
AI summary
One or more systems are disclosed for a diaphragm pump. The diaphragm pump includes a valve inlet portion elongated in a first direction along a longitudinal axis, and a valve outlet portion coupled to the valve inlet portion. A ball check valve is arranged between the valve inlet portion and the valve outlet portion. The ball check valve includes a sealing ring arranged over the valve inlet portion, and a ball arranged over the sealing ring. The ball is configured to move between a seated position and an unseated position, wherein a central axis of the ball extends through a center of the ball and in the first direction, wherein the central axis is coincident with the longitudinal axis when the ball is in the seated position, and wherein the central axis is offset from the longitudinal axis when the ball is in the unseated position.