Door for drum washing machine, and drum washing machine
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Solution Overview
Problem
The existing door assembly structures for drum washing machines are inefficient due to complex and labor-intensive assembly processes, fragile snap jaw structures prone to fracture, and high size control requirements, leading to reduced production and assembly efficiency and durability issues.
Innovation Solution
A door design featuring an inner frame, glass tub, middle frame, and outer frame with a clamped window screen, simplified snap connections, and projection structures to reduce noise and stress, eliminating the need for snap jaws on the window screen and enhancing assembly and production efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If snap jaw structures are arranged at the edge of the window screen to connect it to the middle frame, then the window screen can be firmly fixed, but the snap jaw structures are prone to fracture during demolding and pickup due to material fragility and weaker strength
Solution Approach 1:
The patent removes the snap jaw structures from the window screen design. Instead of using snap jaws to connect the window screen to the middle frame, the patent employs a different connection mechanism that eliminates the fragile snap jaw components entirely, thereby solving the fracture problem while maintaining connection reliability
Solution Approach 2:
The patent replaces the fragile snap jaw structures with a more robust connection system using the outer frame that can withstand demolding and handling forces without fracturing, effectively substituting a weak component with a stronger alternative
2Reliability
If snap jaw structures are used to connect the window screen to the middle frame, then the window screen can be attached, but size control requirements on the window screen component and the middle frame component are very high and slight deviation causes difficulty in assembly
Solution Approach 1:
The patent changes the connection parameters by replacing snap jaw dimensions with outer frame dimensional relationships. The outer frame connection system uses larger, more tolerant dimensions that reduce sensitivity to manufacturing variations, thereby lowering size control requirements while maintaining reliable connection
3Reliability
If snap jaw structures are used to connect the window screen to the middle frame, then the window screen can be fixed, but all the snap jaw are required to be aligned with corresponding snap groove and be connected in a snap-in manner one by one during assembly which reduces assembly efficiency
Solution Approach 1:
The patent merges the window screen connection function into the outer frame assembly process. By integrating the window screen fixation with the outer frame installation, the patent eliminates the need for separate snap-in operations for each snap jaw, thereby significantly improving assembly efficiency while maintaining reliable window screen fixation
4Reliability
If snap jaw structures are used at the edge of the window screen, then the window screen can be connected to the middle frame, but the snap jaw will apply a large pulling force to the middle frame when the window screen is pressed during transportation or carrying-on-back which damages weld strength
Solution Approach 1:
The patent removes the snap jaw structures that cause the pulling force problem. By eliminating the snap jaw connection mechanism, the patent prevents the transmission of large pulling forces to the middle frame during window screen pressing operations, thereby protecting the weld strength between the middle frame and inner frame while maintaining reliable window screen connection through the outer frame
Data Source
AI summary
A door for a drum washing machine comprises an inner frame, a glass tub, a middle frame, a window screen and an outer frame which are arranged sequentially from the inner side of the door to the outer side of the door. The middle frame is in welded connection with the inner frame, the glass tub is clamped between the inner frame and the middle frame, the outer frame is in snapped connection with the middle frame and/or the inner frame, and the window screen is clamped between the outer frame and the middle frame. The window screen is free of snap jaw, so that the structure is simplified, and production of the window screen is accelerated.