Impeller Rib Welding Structure for High-Pressure Pump Assembly
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Solution Overview
Problem
The existing pump device designs face issues with insufficient welding strength between the flange portion and the vane wheel at the outer peripheral portion of the impeller due to deformation of the resin holding member, leading to potential peeling off under high fluid pressure.
Innovation Solution
The design incorporates a rib structure with a gap between the inner and outer peripheral portions, allowing for secure welding even when the flange portion is curved, and includes a crushed welding convex portion to ensure adequate welding strength and prevent excessive interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the tip end of the vane portion is inserted into the groove of the flange portion deformed into an umbrella shape to be fixed, then the vane wheel can be assembled to the flange portion, but the flange portion and the vane portion excessively interfere with each other at an inner peripheral portion of the impeller, and a gap is formed between the flange portion and the vane portion or a welding amount is insufficient at an outer peripheral portion of the impeller
Solution Approach 1:
The vane portion is divided into two functional segments: an inner peripheral portion that forms a gap with the flange portion to prevent excessive interference, and an outer peripheral portion that provides sufficient welding area. This segmentation allows each part to fulfill its specific function independently, resolving the contradiction between assembly feasibility and welding strength.
Solution Approach 2:
Different regions of the vane portion are given different geometric characteristics tailored to their functional requirements. The inner peripheral portion has a configuration that creates a gap with the flange portion to avoid interference, while the outer peripheral portion is designed to provide adequate welding area. This local differentiation of geometry ensures both easy assembly and strong welding at the critical outer peripheral region.
2Ease of manufacture
If the tip end of the vane portion is inserted into the groove of the flange portion deformed into an umbrella shape to be fixed, then the vane wheel can be assembled to the flange portion, but the flange portion and the vane portion excessively interfere with each other at an inner peripheral portion of the impeller, and a gap is formed between the flange portion and the vane portion or a welding amount is insufficient at an outer peripheral portion of the impeller
Solution Approach 1:
The vane portion is segmented into inner and outer peripheral portions with distinct functions. The outer peripheral portion is specifically designed to provide sufficient welding area, ensuring reliable welded portions that can withstand high fluid pressure without peeling off.
Solution Approach 2:
The outer peripheral portion of the vane portion is given specialized geometric properties that ensure adequate welding area and reliable welding. This local quality enhancement at the critical welding region ensures the welded portions maintain high reliability under operating conditions.
3Ease of manufacture
If the welding amount is insufficient at the outer peripheral portion of the impeller, then the assembly can be manufactured, but the strength becomes insufficient, and the welded portion may be peeled off during driving
Solution Approach 1:
The outer peripheral portion of the vane portion is designed with specific geometric characteristics that ensure sufficient welding area. This localized geometric optimization at the critical welding region guarantees adequate welding strength while maintaining overall manufacturing feasibility of the impeller assembly.
Data Source
AI summary
An impeller of a pump device includes a vane wheel fixed to a flange portion of a rotor member. The vane wheel includes a plurality of vane portions protruding from a disc portion opposed to the flange portion in an axial direction. At a tip end of each vane portion, a rib that is inserted into a fixing groove provided in the flange portion is provided. A gap in the axial direction is provided between a tip end of an inner peripheral portion including an end portion on an inner side in a radial direction of the rib and a bottom surface of the fixing groove, and a welded portion welded to the fixing groove is provided at a tip end on another side in the axial direction of an outer peripheral portion including an end portion on an outer side in the radial direction of the rib.