Eccentric Spraying Assembly for Dishwasher Dead-Zone Elimination
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Solution Overview
Problem
Conventional dish washing machines with rotary spraying arms struggle to effectively wash the front and rear regions of the inner tub due to their round spraying area, resulting in dead zones and insufficient cleaning.
Innovation Solution
A spraying assembly for dish washing machines featuring a sprayer with eccentric rotation and epicycloid motion tracks, ensuring a wider washing coverage by creating a quadrate or square wash area, including a bottom shell, spraying seat, sprayer with multiple orifices, and an actuator-driven transmission system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a common rotary spraying arm with round spraying area is used, then the structure is simple, but the washing coverage is insufficient and dead zones are created in front and rear regions
Solution Approach 1:
The patent applies asymmetry by positioning the sprayer eccentrically relative to the spraying seat rotation center. The sprayer rotation center is offset from the spraying seat rotation center, creating an asymmetric configuration that transforms the circular spraying path into an epicycloid path, thereby expanding coverage to include previously unreachable front and rear regions of the inner tub
Solution Approach 2:
The patent implements dynamics through the epicycloid motion trajectory of the spraying orifices. The sprayer rotates on the spraying seat while the spraying seat itself rotates on the bottom shell, creating a compound motion that dynamically adjusts the spraying coverage area throughout the washing cycle, allowing the spray to reach different regions at different times
2Reliability
If a common rotary spraying arm is used, then the device complexity is low, but washing effectiveness in front and rear regions is insufficient
Solution Approach 1:
The asymmetric eccentric arrangement ensures that the spraying orifices traverse the full extent of the inner tub including front and rear regions, eliminating dead zones and improving washing effectiveness throughout the entire washing space
Solution Approach 2:
The patent adds dimensional complexity by implementing two-level rotation: the sprayer rotates on the spraying seat, and the spraying seat rotates on the bottom shell. This creates a three-dimensional epicycloid motion path that comprehensively covers all regions of the inner tub, ensuring reliable washing effectiveness
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 provides a simple structure with enhanced washing coverage and effectiveness, ensuring all areas of the inner tub are cleaned, improving user experience by eliminating dead zones and enhancing overall cleaning performance.
Implementation Method 1
a rotation center of the sprayer being eccentrically arranged with respect to a rotation center of the spraying seat
Implementation Method 2
each spraying orifice of the sprayer has an epicycloid motion track
Data Source
AI summary
A spraying assembly for a dish washing machine includes: a bottom shell, a spraying seat, a sprayer and an actuator. A water storage chamber is formed in the bottom shell, which is provided with a water inlet in communication with the water storage chamber. The spraying seat is rotatably disposed on the bottom shell and provided with a water input passage in communication with the water storage chamber. The sprayer is provided with at least one spraying arm and rotatably disposed on the spraying seat and a rotation center of the sprayer is eccentrically arranged with respect to a rotation center of the spraying seat. The sprayer is provided with a plurality of spraying orifices, each being in communication with the water input passage. The actuator is connected to the sprayer and the spraying seat respectively to drive the sprayer and the spraying seat to rotate around their respective rotation centers.