Fluid discharge pump and household appliance comprising such a pump
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Solution Overview
Problem
Conventional liquid discharge pumps face issues with ensuring the robustness of the mounting structure and maintaining the normal operating speed of the impeller due to unreliable connections between the impeller and the rotary shaft of the electric motor.
Innovation Solution
A liquid discharge pump design featuring a connector with a hollow cylinder and disc parts, where the impeller is securely attached to the drive shaft through a recess and locking mechanism, ensuring a sealed and stable connection via multiple locking parts and pins distributed evenly around the circumference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the impeller is attached to the rotary shaft via a connecting element, then the assembly process becomes easier and the rotor module can be easily installed, but the reliability of the mutual connections cannot be ensured and the rotating speed of the impeller is deteriorated
Solution Approach 1:
The connecting element is divided into multiple functional parts: a first connecting part with external threading for screw connection to the rotary shaft, and a second connecting part with a central through-hole for receiving the impeller. This segmentation allows each part to perform its specific function optimally while maintaining overall connection reliability
Solution Approach 2:
The second connecting part is positioned within the first connecting part, with the impeller receiving through-hole nested in the central region. This nested structure allows the connecting element to integrate multiple connection functions in a compact design, ensuring both ease of assembly and connection reliability
2Adaptability or versatility
If the impeller is attached to the rotary shaft via a connecting element, then the rotor module can be easily installed regardless of impeller design, but the rotating speed of the impeller is deteriorated
Solution Approach 1:
The connecting element serves multiple functions: it connects the impeller to the rotary shaft, provides structural support, enables easy assembly through external threading, and accommodates different impeller designs through its universal interface. This multi-functionality maintains installation flexibility while ensuring proper power transmission for maintaining impeller speed
3Device complexity
If a simple connecting element is used, then the device complexity is reduced, but the robustness of the mounting structure cannot be ensured
Solution Approach 1:
The connecting element is designed with pre-formed external threading on the first connecting part, allowing for preliminary screw connection to the rotary shaft before final impeller assembly. This preliminary action ensures proper alignment and pre-loaded connection, enhancing mounting structure robustness without significantly increasing device complexity
Data Source
AI summary
The present invention relates to a liquid drainage pump comprising a motor compartment (10), an electric motor (20) having a drive shaft (21) located in the motor compartment, an impeller (30), and a connecting piece (40). The impeller is attached to the drive shaft (21) via the connecting piece and has a recess (31) for the tight fit of the connecting piece (40), while the connecting piece has a through-hole (41) for receiving the drive shaft (21). The liquid drainage pump is characterized by the fact that a pin (44) is formed on the connecting piece and a bore (32) is formed in the impeller (30) for the tight fit of the pin. In this way, a more secure connection between the impeller (30) and the connecting piece (40) can be achieved, thus ensuring an unimpaired operating speed of the impeller after its installation and an optimal discharge capacity of the entire liquid drainage pump.