Heating pump and dish washing machine
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Solution Overview
Problem
Existing heating pumps in kitchen appliances face reduced hydraulic efficiency due to backflow at the impeller's mounting position, which is caused by the small diameter of the cover plate matching with the inlet, leading to increased on-way resistance and reduced lift.
Innovation Solution
The design incorporates an annular cover plate with a matching surface that extends beyond the cover plate's diameter, creating a gap and increasing on-way resistance to prevent backflow, while maintaining a uniform gap to prevent scratching and ensure hydraulic efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the cover plate diameter is made nearly the same as the inlet cylindrical section diameter, then the device complexity is reduced, but the on-way resistance becomes small causing water backflow and reduced hydraulic efficiency
Solution Approach 1:
The matching surface extends in the axial direction beyond the cover plate diameter, creating a multi-dimensional blocking structure. This axial extension adds a new dimension to the blocking mechanism, preventing backflow through the gap without requiring increased radial diameter, thus maintaining simple geometry while improving hydraulic efficiency
Solution Approach 2:
The extended matching surface acts as an intermediary blocking structure between the cover plate and the heating cavity wall. It creates an additional barrier that prevents water from flowing back through the gap, mediating between the simple circular geometry and the requirement for backflow prevention
2Productivity
If the matching surface diameter is increased to block backflow, then the hydraulic efficiency is improved, but the gap between the cover plate and matching surface increases causing scratching risk
Solution Approach 1:
Instead of increasing the radial diameter of the matching surface, the invention extends it in the axial direction. This dimensional change allows the matching surface to block backflow effectively while maintaining a consistent radial gap distance between the cover plate and matching surface, preventing both backflow and scratching
Solution Approach 2:
The matching surface has different functional zones: the portion within the cover plate diameter provides scratching prevention through uniform gap, while the extended axial portion provides backflow blocking. This local differentiation of function resolves the contradiction between gap maintenance and backflow prevention
3Object-affected harmful factors
If the gap between the matching surface and cover plate is increased, then the scratching risk is reduced, but the on-way resistance decreases allowing more backflow
Solution Approach 1:
The invention compensates for the reduced backflow blocking capability from increased radial gap by extending the matching surface in the axial direction. This creates additional on-way resistance through the extended axial path, maintaining hydraulic efficiency despite the larger radial gap that reduces scratching risk
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 configuration effectively reduces backflow and enhances hydraulic efficiency by increasing the length of the gap and using the matching surface as a blocking structure, thereby improving the performance of the water pump.
Implementation Method 1
the fourth end is arranged corresponding to the second end, and a diameter of the fourth end is greater than or equal to a diameter of the second end
Implementation Method 2
there is a gap between the matching surface and the cover plate
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A heating pump (104) and a dish washing machine (100). The heating pump (104) comprises: a housing (1), a heating cavity (13) being provided in the housing (1), and the housing (1) being provided with a water inlet (1141) communicated with the heating cavity (13); and an impeller (2), the impeller (2) being provided in the heating cavity (13), the impeller (2) comprising an annular cover plate (21), a first end (211) of the cover plate (21) defining a water inlet port (213) correspondingly communicated with the water inlet (1141) in a surrounding manner, and a second end (212) of the cover plate (21) extending in a direction away from the water inlet (1141) in the axial direction of the impeller (2) and expanding outwards. An annular matching surface (1111) is provided in the heating cavity (13), the outer side of the cover plate (21) is wrapped with the matching surface (1111), and a gap (15) is formed between the matching surface (1111) and the cover plate (21); the matching surface (1111) has a third end (1112) and a fourth end (1113) which are arranged in the axial direction of the impeller (2), the fourth end (1113) corresponds to the second end (212), and the diameter of the fourth end (1113) is larger than or equal to that of the second end (212). By increasing on-way resistance and a blocking structure, the purpose of reducing impeller (2) clearance backflow is achieved, thereby improving the hydraulic efficiency of the water pump.