Dishwasher Pump Housing With Ring Heater and Cover Discharge Layout
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Solution Overview
Problem
Conventional dishwasher pumps have a vertical discharge port arrangement, leading to increased radial dimensions, reduced installation space, and inefficient heating due to a small heating surface, which can result in premature aging and leaks at connection points.
Innovation Solution
The discharge port is relocated to the housing cover, allowing for a more compact design, reducing radial dimensions, and a tubular heating device with a closed circular cross-section is used, enabling uniform heating and reducing manufacturing complexity, with the intake port arranged at an acute angle to the discharge port, facilitating direct connections and eliminating the need for additional parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the discharge port is arranged vertically relative to the intake port, then the pump structure is simple, but the radial dimensions increase and installation space is reduced
Solution Approach 1:
The discharge port is relocated from a vertical arrangement to the housing cover, changing the spatial dimension of the connection. This dimensional reconfiguration allows the pump to achieve compact radial dimensions while maintaining structural simplicity, as the discharge port now integrates with the cover rather than extending radially outward.
2Ease of manufacture
If the ring-shaped heating device has an opening for the discharge port, then the discharge port can be connected, but the heating surface area is reduced and heating efficiency decreases
Solution Approach 1:
The heating device is segmented into a tubular heat exchanger with closed circular cross-section, separating the heating function from the discharge port connection. The discharge port is positioned at the end of the tubular structure rather than creating an opening in the heating ring, thereby maintaining the full heating surface area while enabling discharge connection.
Solution Approach 2:
The tubular heat exchanger acts as an intermediary structure that provides both heating functionality and discharge port integration. The tube serves as the medium through which heated liquid circulates, eliminating the need for openings in the heating ring while maintaining thermal efficiency.
3Loss of time
If high temperatures are used for heating the washing liquor quickly, then heating time is reduced, but premature aging and leaks occur at connection points
Solution Approach 1:
The heating system uses a tubular heat exchanger design that increases the heating surface area and improves heat distribution. This allows for more efficient heating at moderate temperatures rather than requiring extreme temperatures, thereby reducing thermal stress on connection points and sealing elements while maintaining acceptable heating time.
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 efficiency, reduces energy loss, and simplifies manufacturing, while allowing for cost-effective production and improved durability by using plastic for the housing and metal for the heating device, ensuring effective circulation of heated washing liquor.
Implementation Method 1
The tube of the heating device is advantageously made of metal, since owing to its good heat-conducting properties it transfers a maximum of the heat energy to the washing liquor
Implementation Method 2
Plastic is also a poor conductor of heat, which means that the heated washing liquor can be circulated in the pump virtually without energy loss
Data Source
AI summary
A pump, particularly for dishwashers, is provided and includes a housing made of a housing bottom, a housing cover, and a heating device disposed in between the bottom and cover for heating a washing fluid. The heating device forms a ring-shaped side wall of the housing. An impeller is arranged in the housing, an intake connection is arranged axially in the housing cover relative to the axis of rotation of the impeller, and a pressure connection is arranged in the housing cover.