Axial Heating Pump Layout to Protect Impellers From Heat Aging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing heating pumps in dishwashers and washing machines face challenges with excessive volume due to thermal safety requirements, leading to increased outer diameters and susceptibility of impellers to heat aging, as well as inefficient heat transfer due to radial water flow and insufficient surface contact.
Innovation Solution
A heating pump design with a pump cavity and heating cavity arranged side by side axially, connected through a communication channel, featuring a spiral heating member and tangential expansion channel to reduce volume, prevent impeller aging, and enhance heat transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heating tubes are arranged inside pump casings, then heating function is achieved, but the outer diameter of the pump casing increases due to thermal safety requirements
Solution Approach 1:
The pump casing is divided into two separate cavities: a pump cavity for the impeller and a heating cavity for the heating member. This segmentation allows the heating function to be isolated from the pump components, enabling compact arrangement without increasing the overall outer diameter while maintaining thermal safety.
Solution Approach 2:
The heating cavity is nested within the pump casing structure, with the heating member positioned in the heating cavity that is surrounded by the pump cavity wall. This nested arrangement allows both heating and pumping functions to coexist in a compact configuration without requiring additional external space.
2Temperature
If heating tubes are arranged inside pump casings, then heating function is achieved, but the volume of the pump increases
Solution Approach 1:
By segmenting the pump casing into pump cavity and heating cavity, the design eliminates the need for large clearance spaces required by conventional integrated heating tube arrangements, thereby reducing the overall volume of the heating pump while maintaining effective heating capability.
Solution Approach 2:
The heating cavity is arranged axially adjacent to the pump cavity rather than radially, changing the spatial dimension of heat transfer integration. This axial arrangement allows for more efficient space utilization and compact volume compared to traditional radial configurations.
3Temperature
If heating tubes are arranged inside pump casings, then heating function is achieved, but the impeller becomes susceptible to heat aging
Solution Approach 1:
The separation of the pump cavity and heating cavity creates a physical barrier that isolates the impeller from the heating member. This segmentation prevents direct thermal exposure of the impeller to high temperatures, eliminating heat aging issues while preserving the heating function for water treatment.
Solution Approach 2:
The pump cavity wall acts as an intermediary thermal barrier between the heating member in the heating cavity and the impeller in the pump cavity. This intermediate structure allows heat transfer to the water while protecting the impeller from direct thermal exposure and heat aging.
4Temperature
If heating tubes are arranged inside pump casings, then heating function is achieved, but a large distance must be maintained for thermal safety
Solution Approach 1:
The segmentation into separate cavities allows the thermal safety distance to be minimized within the heating cavity structure itself, while the pump cavity can be positioned immediately adjacent without requiring additional clearance, thereby maximizing the effective volume rate.
Solution Approach 2:
The heating cavity is designed with localized thermal management features including the heating member arrangement and cavity wall structure that provide adequate thermal protection in the specific heating zone, allowing the overall pump volume to be minimized while maintaining thermal safety where required.
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 design reduces the overall volume of the heating pump, prevents premature impeller aging, and improves heat transfer performance by directing water flow tangentially through the heating cavity, ensuring efficient heating and extended component lifespan.
Implementation Method 1
a heating member arranged within the heating cavity
Implementation Method 2
directing water flow tangentially through the heating cavity, ensuring efficient heating
Data Source
AI summary
A heating pump includes a driving electric motor; a pump case, wherein a pump cavity and a heating cavity are defined in the pump case, the pump cavity and the heating cavity are roughly arranged side by side in an axial direction and are in communication by means of a communication channel, and a water inlet and a water outlet are formed in the pump case; an impeller arranged in the pump cavity; and a heating member arranged in the heating cavity. Therefore, not only is the size of the heating pump favorably reduced, the impeller may also be prevented from being radiated at a temperature by the heating member, such that the premature aging of the impeller may be prevented, and thus, the usage performance of the heating pump may be improved.