Electric Pump Stop Assembly Abrasion Reduction
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Solution Overview
Problem
Conventional electric pumps experience abrasion and functional failures in their position-limiting devices due to relative movement during operation, which reduces their service life and efficiency.
Innovation Solution
An electric pump design featuring a stop assembly with fixed first and second stops relative to the shaft, partitioning the pump chamber into wet and dry sections to prevent abrasion and enhance the service life of the position-limiting components, including a rotor assembly with self-lubricating bearings and a sealing system for reduced friction and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a position-limiting device is used to limit the impeller position, then the impeller position is controlled, but the device rotates relative to the shaft during operation causing abrasion and functional failure
Solution Approach 1:
The patent extracts the position-limiting function from a rotating component and transfers it to a stationary component. The stop assembly is fixed to the housing rather than rotating with the shaft, separating the position-limiting function from the rotating motion, thereby eliminating abrasion between the position-limiting device and the rotating shaft.
Solution Approach 2:
Instead of fixing the position-limiting device to the rotating shaft as in conventional designs, the patent inverts the approach by fixing the stop assembly to the stationary housing. This inversion makes the position-limiting device non-rotating, eliminating the relative motion that causes abrasion while maintaining effective position control.
2Manufacturing precision
If the position-limiting device is fixed to the rotating shaft, then the impeller position is limited during rotation, but the device experiences wear due to rotational movement
Solution Approach 1:
The patent extracts the position-limiting function from the rotating shaft system and assigns it to a stationary component fixed to the housing. The stop assembly remains stationary while the rotor assembly rotates against it, eliminating wear on the position-limiting device while maintaining precise rotational position control.
Solution Approach 2:
The patent introduces the stop assembly as an intermediary element between the rotating rotor assembly and the stationary housing. This intermediary component absorbs the wear through its replaceable design while protecting the main shaft and bearing structures, extending the overall system durability.
Data Source
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AI summary
An electric pump (100) is provided, which includes a housing (20), a shaft (40), a rotor assembly (50)and a stop assembly (90). The shaft is fixed to the housing, the rotor assembly is rotatable about the shaft, and the rotor assembly is sleeved on the shaft. The stop assembly is configured to limit the position of the rotor assembly in the chamber. The stop assembly includes a first stop (1) and a second stop (2), the first stop is fixed with respect to a second portion (402) of the shaft, and the second stop is fixed with respect to a first portion (401) of the shaft. No relative movement occurs between the stop assembly and the shaft, which reduces the abrasion between the stop assembly and the shaft resulted from friction, and facilitates improving a service life of the stop assembly.