Eccentric Spraying Arm Assembly for Quadrate Dishwasher Coverage
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Solution Overview
Problem
Conventional dish washing machines often have a 'dead zone' in the front and rear regions due to the round spraying arms, leading to insufficient washing and reduced cleaning effectiveness.
Innovation Solution
A spraying assembly with a sprayer positioned eccentrically on a rotatable spraying seat, utilizing a gear ratio between a sun gear and planetary gear to create an epicycloid motion track for the spraying orifices, resulting in a quadrate wash area that covers the entire tub, including previously unreachable corners.
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 caused in front and rear regions
Solution Approach 1:
The patent applies asymmetry by positioning the sprayer eccentrically on the spraying seat rather than at the center. This asymmetric arrangement allows the spraying orifices to trace an epicycloid motion track that covers the entire quadrate inner tub area, eliminating dead zones in front and rear regions while maintaining structural simplicity
Solution Approach 2:
The patent transitions from simple circular rotation to epicycloid motion by combining the rotation of the spraying seat with the eccentric rotation of the sprayer. This dimensional change in motion trajectory expands the washing coverage from a circular pattern to a quadrate pattern that matches the inner tub geometry
2Area of stationary object
If the spraying seat rotates with eccentric sprayer to achieve epicycloid motion track, then the washing coverage is enlarged to cover dead corners, but the device complexity increases
Solution Approach 1:
The eccentric positioning of the sprayer on the spraying seat creates asymmetric motion that generates the epicycloid trajectory. This asymmetric design is achieved through simple mechanical mounting rather than complex mechanisms, expanding coverage to include dead corners while keeping the structure relatively simple
Solution Approach 2:
The patent employs dynamic motion by allowing the spraying seat to rotate on its axis while the sprayer simultaneously rotates eccentrically. This dynamic combination produces the epicycloid motion track that maximizes washing coverage throughout the washing cycle
3Reliability
If round spraying arms are used in a quadrate inner tub, then the structure is simple, but washing effectiveness is reduced due to insufficient coverage of front and rear regions
Solution Approach 1:
The asymmetric eccentric mounting of the sprayer on the spraying seat creates an epicycloid motion pattern that effectively covers the quadrate inner tub geometry. This resolves the mismatch between round spraying arms and quadrate tub shape, improving washing effectiveness without requiring complex multi-arm configurations
Solution Approach 2:
The spraying assembly achieves universal coverage of the entire inner tub surface through the epicycloid motion track. The single sprayer configuration performs the function of multiple spraying zones by tracing a path that reaches all areas including front, rear, and corner regions
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 wide washing coverage, ensuring all areas of the tub are cleaned effectively, enhancing the washing experience and efficiency while maintaining a simple structure.
Implementation Method 1
a gear ratio between a sun gear and planetary gear to create an epicycloid motion track
Data Source
Figure 1~2
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Figure 5~6
AI summary
A spraying assembly for a dish washing machine is provided. The spraying assembly includes: a bottom shell (10), a spraying seat (20), a sprayer (30) and an actuator (40). A water storage chamber (11) is formed in the bottom shell (10), and the bottom shell (10) is provided with a water inlet (12) communicated with the water storage chamber (11). The spraying seat (20) is rotatably arranged to the bottom shell (10), and is provided with a water input passage (21) communicated with the water storage chamber (11). The sprayer (30) is provided with at least one spraying arm. The sprayer (30) is rotatably arranged to the spraying seat (20) and a rotation center of the sprayer (30) is eccentrically arranged with respect to a rotation center of the spraying seat (20). The sprayer (30) is provided with a plurality of spraying orifices (311), and each spraying orifice (311) is communicated with the water input passage (21). The actuator (40) is connected to the sprayer (30) and the spraying seat (20) respectively to drive the sprayer (30) and the spraying seat (20) to rotate around their respective rotation centers. Each spraying orifice (311) in the sprayer (30) of the spraying assembly for the dish washing machine has an epicycloid motion track, so that a spray-wash region is substantially quadrate, and therefore a washing area of the spraying assembly is enlarged. Further, a dish washing machine having the spraying assembly is provided.