Air-Operated Double Diaphragm Pump Shaft and Bushing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Air-operated double diaphragm pumps (AODD) suffer from inefficiency due to inertial losses and high air consumption, leading to increased power requirements and maintenance costs, despite their ability to handle abrasive fluids and particles that conventional pumps cannot.
Innovation Solution
The introduction of a shaft with indentations and a bushing with vents and terminal holes allows for faster air bleeding and quick direction change, reducing air resistance and retaining some compressed air for the next stroke, thereby enhancing efficiency and reducing air consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If compressed air is directed into chambers to move diaphragms in prior art AODD pumps, then pumping action is achieved, but air consumption is high and efficiency is poor due to inertial losses
Solution Approach 1:
The air passage is segmented into multiple pathways through the bushing structure. The bushing includes a first air passage and a second air passage that are spatially separated and independently controlled, allowing selective airflow to different diaphragms. This segmentation enables more precise control of air consumption and reduces inertial losses by directing air only where needed.
Solution Approach 2:
The slide valve dynamically switches between directing compressed air to the first chamber or the second chamber based on the pumping cycle phase. The valve position changes continuously, enabling rapid response and reducing the time air is wasted during direction changes. This dynamic control optimizes air usage and improves overall pumping efficiency.
2Power
If diaphragms are moved by compressed air pressure in prior art pumps, then fluid pumping is achieved, but the pump requires more power and has high maintenance costs
Solution Approach 1:
The invention replaces traditional mechanical valve mechanisms with a pneumatic control system using a slide valve that is actuated by air pressure differential. This substitution reduces mechanical wear and friction, leading to lower maintenance requirements and extended component life while maintaining effective diaphragm actuation.
Solution Approach 2:
The pump utilizes pneumatic principles throughout, including the use of compressed air to actuate diaphragms, control the slide valve position, and manage fluid flow. The pneumatic system replaces traditional mechanical linkages and reduces the need for complex mechanical components, thereby lowering maintenance costs and improving reliability.
3Stability of the object's composition
If a shaft connects both diaphragms in prior art AODD pumps, then synchronized motion is achieved, but air resistance is high and air consumption increases
Solution Approach 1:
The bushing acts as an intermediary component between the shaft and the air supply system. It provides dedicated air passages that bypass the shaft, allowing air to reach the diaphragms without having to flow through the shaft structure. This eliminates the air resistance caused by the shaft and reduces air consumption while maintaining synchronized diaphragm motion through the shaft's mechanical connection.
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 results in a 30-40% reduction in air consumption while maintaining or increasing output, improving flow rate and shifting efficiency compared to prior AODD pumps.
Implementation Method 1
The shaft includes a plurality of indentations which allow passage of air and the bushing is adapted to receive the shaft and be in sliding engagement with the shaft. The bushing includes vents formed on the bushing and a hole formed at each respective terminal portion of the bushing to allow passage of air.
Implementation Method 2
Air-operated double diaphragm pumps or AODD pumps are positive displacement reciprocating pumps which operate using compressed air to exert pressure on diaphragms which creates a pumping action to move fluids.
Implementation Method 3
This quick change in the slide valve direction also allows some compressed air to be retained in a chamber without being completely exhausted and the retained compressed air can be used for a next stroke, thus creating better efficiency by reducing air consumption.
Data Source
Figure 1a
Figure 1b
Figure 1c
AI summary
An air-operated double diaphragm pump, wherein the pump (40) is disposed with a shaft (30) and a bushing (28). The shaft (30) includes a plurality of indentations, which allow passage of air and the bushing (28) is adapted to receive the shaft (30) and be in sliding engagement with the shaft (30). The bushing (28) includes vents (22) formed on the bushing and a hole (24) formed at each respective terminal portion of the bushing (28) to allow passage of air. The bushing (28) also includes ribs (26) protruding radially outwards from inner surface of the bushing (28) toward the shaft (30). The indentations (34) disposed along the shaft (30) and hole (24) formed at each terminal portion of the bushing (28) are alignable to create a path for air to travel.