Layered Diaphragm Pump Housing to Prevent Fiber Contamination
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Solution Overview
Problem
Conventional diaphragm pump housings face challenges with material strength and fluid contamination due to the use of resin-only or fiber-reinforced resin materials, where resin-only materials are inadequate for high-pressure applications and fiber-reinforced resins require thick walls and can contaminate the fluid with fibers, causing drag and performance issues.
Innovation Solution
A diaphragm pump housing with separated laminar layers, where the fluid-side surface is made of resin-only material and the remaining thickness is reinforced with fibers, achieved through injection molding with localized heating to create distinct resin and fiber layers, resulting in a stronger, thinner, and cost-effective design without fiber contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If fiber reinforced resin is used to increase pump housing strength, then mechanical strength is improved, but the wall thickness must be increased and fibers contaminate the fluid
Solution Approach 1:
The pump housing wall is segmented into two distinct layers: an outer layer containing fiber reinforcement for structural strength, and an inner fiber-free layer in contact with the fluid. This segmentation allows each layer to perform its specific function without compromise - the outer layer provides mechanical strength while the inner layer prevents fiber contamination of the fluid.
Solution Approach 2:
Different regions of the pump housing wall are given different properties: the outer region contains fibers for strength, while the inner region adjacent to the fluid is fiber-free to prevent contamination. This local differentiation of material properties resolves the contradiction between needing fibers for strength and avoiding them for fluid purity.
2Weight of moving object
If fiber reinforced resin is used to reduce material usage, then weight is reduced, but wall thickness must be increased
Solution Approach 1:
The wall structure is segmented into functional layers that optimize both weight and thickness. The outer fiber-reinforced layer provides high strength-to-weight ratio, allowing thin walls, while the inner fiber-free layer maintains fluid compatibility. This segmentation enables reduced overall wall thickness compared to conventional fiber-reinforced designs.
Solution Approach 2:
The pump housing utilizes a composite structure combining fiber-reinforced resin and fiber-free resin in distinct layers. This composite approach leverages the high strength-to-weight ratio of fiber-reinforced materials in the outer layer while using plain resin in the inner layer, achieving both weight reduction and thin wall design without fiber contamination.
3Reliability
If resin-only material is used to prevent fiber contamination, then fluid purity is improved, but mechanical strength is insufficient for high-pressure applications
Solution Approach 1:
The housing wall is segmented into functional zones: an inner fiber-free layer ensures fluid purity by preventing fiber contamination, while an outer fiber-reinforced layer provides the mechanical strength needed for high-pressure applications. This segmentation allows both requirements to be satisfied simultaneously in different regions of the same component.
Solution Approach 2:
Different material properties are applied locally within the wall structure: the inner layer adjacent to the fluid has fiber-free resin for purity, while the outer layer has fiber reinforcement for strength. This local quality differentiation resolves the contradiction between fluid purity and mechanical strength.
4Manufacturing precision
If heating is applied to create laminar separation, then fiber-free inner layer is achieved, but cycle time is increased
Solution Approach 1:
The molding process utilizes temporary parameter changes (heating) during the injection phase to achieve laminar separation of fibers, then returns to normal cooling conditions for the remainder of the cycle. This controlled parameter change enables precise layer separation without permanently extending the entire molding cycle time.
Solution Approach 2:
Heating is applied preliminarily at the beginning of the injection process to establish the laminar flow pattern and separate fibers before the main injection occurs. This preliminary action creates the desired layer structure early in the cycle, allowing the rest of the molding process to proceed at normal speed without extended cycle time.
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
The solution provides a pump housing that is substantially stronger and more cost-effective, with a smooth interior surface for fluid flow, reducing material usage by approximately 50% and minimizing fiber-induced drag, while maintaining high mechanical strength and endurance.
Implementation Method 1
The heating element will be used to raise the temperature of the mold for a brief time which will cause laminar separation creating separate resin-only and resin-fiber strata in the housing wall
Implementation Method 2
putting a heating element on the side of the mold where the part will be in contact with fluid during its end use. The heating element will be used to raise the temperature of the mold for a brief time
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A pump configured to move fluid from one location to another location is provided. The pump includes a pump housing. The pump housing is composed of a wall structure. The wall structure includes a first laminar portion of a thickness of the wall structure composed of a resin that does not include any reinforcing fibers. The wall structure also includes a second laminar portion of the thickness of the wall structure that is composed a resin with reinforcing fibers dispersed through the resin.