Liquid Pump Laser Welding PPS Glass Fiber Binding
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Solution Overview
Problem
Existing liquid pumps with high air tightness requirements face insufficient welding strength due to low laser transmittance of plastic parts, which is not adequately addressed by traditional mechanical connections or current laser welding methods.
Innovation Solution
The liquid pump design incorporates polyphenylene sulfide (PPS) mixed with glass fiber for both outer and inner binding segments, where the outer segments are permeable to laser light and the inner segments absorb it, enhancing the welding strength by forming a sealed connection between the pump cover, sleeve, and pump house through laser welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional mechanical connection methods (screws) are used to connect pump components, then assembly is simple and cost-effective, but air tightness and welding strength are insufficient for high-performance requirements
Solution Approach 1:
The patent replaces traditional mechanical screw connections with laser welding technology to connect the pump cover, sleeve, and pump house. This substitution eliminates the need for mechanical fasteners and achieves superior air tightness through direct fusion of plastic components, resolving the contradiction between simple assembly and high reliability requirements.
Solution Approach 2:
The patent modifies the material parameters of the binding segments by incorporating glass fiber into polyphenylene sulfide (PPS) to create a composite material with specific laser transmittance properties. This parameter change enables the outer binding segment to be permeable to laser light while maintaining structural integrity, allowing effective laser welding without compromising air tightness.
2Strength
If plastic parts with conventional material composition are used for binding segments, then manufacturing is straightforward, but laser transmittance is low resulting in insufficient welding strength
Solution Approach 1:
The patent employs composite materials by mixing glass fiber with polyphenylene sulfide (PPS) to create the outer binding segment. This composite formulation provides the necessary laser transmittance for effective welding while maintaining mechanical strength and structural properties, thereby achieving high welding strength without significantly complicating the manufacturing process.
Solution Approach 2:
The patent applies different material compositions to different parts of the binding system: the outer binding segment uses glass fiber-reinforced PPS for laser transmittance, while the inner binding segment uses material capable of absorbing laser light. This local differentiation of material properties optimizes both welding strength and manufacturing feasibility for each specific component location.
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 design improves the welding strength and air tightness of the liquid pump by increasing laser transmittance and absorption, resulting in a more reliable and sealed connection between the components.
Implementation Method 1
the outer binding segment is made of polyphenylene sulfide mixed with glass fiber, and permeable to a laser light
Implementation Method 2
the inner binding segment is capable of absorbing the laser light
Implementation Method 3
The laser energy is absorbed to increase the temperature of the inner plastic part, thereby melting the outer plastic part and the inner plastic part, and then welding the two plastic parts together
Data Source
AI summary
A liquid pump includes a pump house with an electric motor housed therein, a pump cover connected to the pump house, an impeller housed in the pump cover and driven by the motor, and a sleeve disposed between the pump cover and the pump house. Two of the pump cover, the pump house, and the sleeve are respectively provided with an outer binding segment and an inner binding segment, the outer binding segment is made of polyphenylene sulfide mixed with glass fiber, and permeable to a laser light, the inner binding segment is capable of absorbing the laser light.