Dishwasher having multiple spray arms for improved washing effectiveness
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Solution Overview
Problem
Existing dishwashers have difficulty efficiently washing heavily soiled areas due to limitations in the design of additional spray arms, which increase production costs without adequate effectiveness.
Innovation Solution
An additional spray arm is positioned under the main spray arm, rotating parallel to the base and sweeping a region of the rack with water, utilizing a transfer mechanism and headpiece to enhance water distribution and rotation, allowing for targeted cleaning of heavily soiled areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional spray arms with complex structures are used to spray extra water to heavily soiled regions, then washing effectiveness is improved, but production costs increase
Solution Approach 1:
The spray arm is divided into a main spray arm and an additional spray arm, each with specific functions. The additional spray arm is simpler in structure but strategically positioned to target heavily soiled regions, achieving effective segmentation of washing zones without requiring complex multi-component systems
Solution Approach 2:
Instead of adding complex spray mechanisms to existing spray arms, the invention inverts the approach by adding a simpler additional spray arm positioned underneath the main spray arm. This additional arm rotates in the opposite direction and targets specific heavily soiled regions, achieving effective washing without increasing overall structural complexity
2Reliability
If additional spray arms are added to spray extra water to heavily soiled regions, then washing effectiveness is improved, but the additional spray arms cannot spray the region efficiently
Solution Approach 1:
The additional spray arm is specifically designed with spray holes oriented to target heavily soiled regions underneath the rack. The spray direction, water flow rate, and rotation speed are optimized for local conditions in heavily soiled areas, achieving efficient spraying where it is most needed rather than uniform coverage across all regions
Solution Approach 2:
The additional spray arm rotates dynamically in the opposite direction to the main spray arm, creating overlapping spray patterns that enhance coverage of heavily soiled regions. The rotation mechanism allows the spray arm to adapt its position and spray angle dynamically during operation, improving spraying efficiency in targeted zones
3Reliability
If additional spray arms are used to target heavily soiled regions, then washing effectiveness is improved, but device complexity increases
Solution Approach 1:
The additional spray arm is merged with the existing water supply system, sharing the same water line and pump as the main spray arm. The rotation mechanisms are coordinated to work together, with the additional spray arm rotating in opposition to the main spray arm. This merging approach achieves enhanced washing effectiveness without proportionally increasing overall system complexity
Solution Approach 2:
The additional spray arm serves multiple functions: it targets heavily soiled regions underneath the rack, creates overlapping spray patterns with the main spray arm, and can be controlled to operate during specific wash cycle phases. This multi-functionality justifies the added component by delivering multiple benefits from a single relatively simple addition
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 additional spray arm effectively washes more water onto heavily soiled regions, improving cleaning efficiency and reducing production costs by optimizing water distribution and rotation mechanisms.
Implementation Method 1
By means of the hole spraying water to the left side of the additional spray arm, the transfer means rotates towards the right in accordance with the action-reaction principle
Implementation Method 2
The additional spray arm, rotating for a certain angle with the water sprayed through the hole on the transfer means, returns to its initial position after the water, that is sprayed through the outlet while the spray arm rotates with the pumping of water into the spray arm, hits the additional spray arm and pushes the additional spray arm
Data Source
AI summary
The present invention relates to a dishwasher (1) comprising a tub (2) having a base (3), a rear wall (4) and two side walls (5) surrounding the base (3); a door (6) providing access to the tub (2), connected to the tub (2) from its lower side and opening by tilting forward; a rack (7) having a washing position wherein it is placed on the base (3) so as to entirely remain inside the tub (2) and a loading position wherein it is positioned on the inner surface of the door (6) by being moved forward when the door (6) is open and wherein loading-unloading can be performed; and a spray arm (8) that extends from the base (3) into the tub (2), that remains under the rack (7) when the rack (7) is in the washing position and that sprays water into the rack (7) by rotating around itself.