Dishwasher Pump Heating Layout With Angled Outlet and Ring Heater
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Solution Overview
Problem
Conventional dishwasher pumps have a vertical pressure connection that increases radial dimensions, requiring more installation space and reducing usable volume, and their small heating surfaces lead to premature aging and leaks due to high heat output.
Innovation Solution
The pressure connection is arranged in the housing cover with a longitudinal axis at an acute angle to the suction connection, allowing for reduced external dimensions, a compact heating device design with a non-perforated metal tube, and efficient energy transfer using thick-film resistors or heating wires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the pressure connection is arranged vertically, then the connection structure is simple, but the radial dimensions of the pump increase and installation space is reduced
Solution Approach 1:
The pressure connection is repositioned from a vertical arrangement to an arrangement in the housing cover, changing the spatial dimension of connection. This allows the pressure connection to be integrated into the cover structure rather than protruding radially, thereby reducing the pump's radial dimensions while maintaining connection functionality.
2Volume of moving object
If the heating surface is made small, then the pump structure is compact, but high heat output requires high temperatures causing premature aging and leaks
Solution Approach 1:
The heating device transitions from a ring-shaped heater with perforations to a tubular heater design. This parameter change in heating surface geometry allows for a larger effective heating surface area while maintaining compact pump dimensions, thereby reducing the need for excessive temperatures and improving reliability of sealing elements and plastic parts.
3Area of stationary object
If the pressure connection is arranged in the housing cover, then the external dimensions are reduced, but the production complexity of the cover increases
Solution Approach 1:
The pressure connection is merged with the housing cover structure, integrating the connection function directly into the cover rather than treating it as a separate component. This merging approach allows the pressure connection to be formed during the injection molding process of the cover, avoiding additional production steps and tools while achieving reduced external dimensions.
4Device complexity
If a ring-shaped heating device with perforations is used, then the structure is simple, but the heating uniformity is poor and production engineering steps are elaborate
Solution Approach 1:
The heating device design is inverted from a ring-shaped heater with perforations (where heat is applied externally through openings) to a tubular heater (where heat is applied internally through the tube wall). This inversion allows for uniform heating of the rinsing liquid as it flows through the tube, eliminating the need for complex perforation patterns and achieving better heating uniformity with simpler production engineering.
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 minimizes installation space, enhances heating uniformity, reduces energy loss, and prevents leaks by maintaining a compact design and efficient energy transfer, while allowing for a larger usable dishwasher volume.
Implementation Method 1
a heating device arranged between them for heating a washing liquid
Implementation Method 2
The thermal energy required to heat the washing liquid is made available by a heating means which is in contact with the tube of the heating device from the outside. Thick-film resistors, tubular heating elements or heating wires that touch the outside of the tube directly can be used as heating means
Implementation Method 3
an impeller arranged in the housing, with a longitudinal axis of the impeller in the housing cover
Data Source
Figure 1
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Figure 3
AI summary
The present invention relates to a pump (10, 110), particularly for dishwashers, comprising a housing made of a housing bottom (28, 128), a housing cover (16, 116), and a heating device (30, 130, 36, 136) disposed in between the bottom and cover for heating a washing fluid, the device forming a ring-shaped side wall of the housing, further comprising an impeller (40, 140) arranged in the housing, an intake connection (18, 118) arranged axially in the housing cover (16, 116) relative to the axis of rotation of the impeller (40, 140), and a pressure connection (20, 120), wherein the pressure connection (20, 120) is arranged in the housing cover (16, 116).