Pump Device Static Electricity Discharge Path
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Solution Overview
Problem
Static electricity generated in pump devices integrated with electric motors can cause malfunctions due to the insulating properties of resin-made motor housings, leading to high voltage currents flowing through thin resin parts and disrupting circuit substrates, and existing solutions that use metal housings increase the pump's size.
Innovation Solution
A pump device configuration with a conductive pump main body, conductive cover body, and conductive securing parts, along with a conductive-elastic member and coil spring, forms a discharge path for static electricity to the external via a grounded terminal, preventing size increase and ensuring proper electrical insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal housing is provided on the external side of the resin-made motor housing to discharge static electricity, then static electricity can be discharged to the external, but the liquid pump becomes disadvantageously large in size
Solution Approach 1:
The patent combines the motor housing and liquid pump housing into a single integrated housing structure. The housing serves dual functions: it provides electrical insulation (like a traditional motor housing) and simultaneously forms part of the static electricity discharge path (replacing the need for a separate metal housing). This merging eliminates the need for additional components while achieving both insulation and discharge functions.
Solution Approach 2:
The housing is designed to perform multiple functions simultaneously: (1) electrical insulation between the motor and external environment, (2) structural support for both motor and pump components, and (3) participation in the static electricity discharge path through conductive portions. This multi-functionality eliminates the need for separate metal housing components.
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
Effectively discharges static electricity externally without enlarging the pump device, preventing malfunctions and maintaining circuit integrity by using a conductive path that includes a conductive-elastic member and coil spring, ensuring the pump operates without size augmentation.
Implementation Method 1
a conductive-elastic member electrically coupled to the connector terminal and configured to make contact with the cover body as applying a load to the cover body
Implementation Method 2
the load applying means is a coil spring and the cover body is provided with a fit-in portion configured to fit into the coil spring
Implementation Method 3
a discharge path is formed through the pump main body, the securing part, the load applying means, the cover body, the conductive-elastic member, and the connector terminal to discharge static electricity to the external via the external-connected terminal
Data Source
AI summary
A pump device, a main body, a cover body, a stator module at least a portion of the external of the stator module being covered with an insulation member, a securing part to secure the pump main body to the cover body, a load applying means provided between the securing part and the cover body so as to apply a load to the securing part and the cover body, a connector terminal electrically coupled to an external-connected terminal which is externally grounded, and a conductive-elastic member electrically coupled to the connector terminal and configured to make contact with the cover body as applying a load to the cover body. A discharge path is formed through the pump main body, the securing part, the load applying means, the cover body, the conductive-elastic member, and the connector terminal to discharge static electricity to the external via the external-connected terminal.