Dishwasher Steam Nozzle Layout for Uniform Tub Coverage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional dishwashers fail to uniformly distribute steam throughout the washing space, leading to incomplete cleaning and temperature inconsistencies, as steam is primarily sprayed from the sides and not from the front or rear, and this can cause back pressure issues in the steam nozzle connected to the sump or pump.
Innovation Solution
A dishwasher design that includes a first steam nozzle on the inner surface of the door to spray steam obliquely throughout the tub, a second steam nozzle at the rear of the tub, and a back pressure prevention unit with a check valve to prevent external air from entering the pump, ensuring uniform steam distribution and reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If steam is sprayed only from the side of the tub, then the steam generator and steam nozzle structure is simple, but the steam cannot wet all surfaces of the objects and temperature distribution is non-uniform
Solution Approach 1:
The steam nozzle is divided into multiple sections with different spray directions. The nozzle includes a first spray hole group spraying toward the front wall, a second spray hole group spraying toward the rear wall, and a third spray hole group spraying toward the side wall, allowing steam to be distributed uniformly throughout the washing space from multiple directions simultaneously
Solution Approach 2:
The steam spray is extended from a single-side direction to three-dimensional multi-directional spray by adding spray holes in different orientations (front, rear, and side directions), transforming the steam distribution from one-dimensional to three-dimensional coverage
2Ease of operation
If steam is supplied only to objects placed in opposite sides of the rack, then the steam nozzle positioning is simple, but the objects placed in the middle part of the rack are not supplied with steam
Solution Approach 1:
The nozzle is segmented into multiple functional groups of spray holes, each responsible for different spatial zones. The first group covers the front area, the second group covers the rear area, and the third group covers the side area, ensuring comprehensive coverage including the middle region where objects are commonly placed
3Device complexity
If the temperature in the washing space is not uniform, then the heating system is simple, but the washing and sterilization effectiveness is reduced
Solution Approach 1:
Different sections of the nozzle provide steam to different local areas of the washing space. The front spray holes deliver steam to the front region, rear spray holes to the rear region, and side spray holes to the side region, creating locally optimized temperature conditions throughout the entire space for effective washing and sterilization
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 solution allows for uniform steam distribution from the front and rear of the tub, improving washing efficiency and preventing back pressure in the steam nozzle, thus enhancing cleaning effectiveness and reducing noise.
Implementation Method 1
a steam nozzle provided at an inner surface of the door to spray steam to the objects
Implementation Method 2
the wash water stored in the sump is heated using a heater provided in the sump
Implementation Method 3
a back pressure prevention unit with a check valve to prevent external air from entering the pump
Data Source
AI summary
A dishwasher is disclosed. The dishwasher includes a cabinet having an opening, a tub provided in the cabinet to accommodate objects for washing, a spray arm for spraying wash water to the objects, a sump for storing wash water, a door for opening and closing the opening, and a first steam nozzle provided at an inner surface of the door to spray steam to the objects.