Conductive Coil Spring for Pump Device Static Elimination
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Solution Overview
Problem
The existing pump device configurations with coil springs extending over circuit boards suffer from magnetic field interference due to electromagnetic induction, which complicates the design and increases costs when using a spring bearing with a protrusion shape to mitigate this issue.
Innovation Solution
A drive device and pump device configuration that eliminates the need for a spring bearing with a protrusion shape by using a conductive coil spring with a spring deformation portion and a conductive bypass portion, where the coil spring is disposed over the circuit board's edge or penetrates through it, forming a static electricity removal path that reduces magnetic field influence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a spring bearing having a protrusion shape is provided in the cover body to reduce magnetic field lines penetrating the circuit board, then the magnetic field interference with the circuit board is reduced, but the device complexity and manufacturing costs increase
Solution Approach 1:
The patent extracts the harmful magnetic field generation by removing the protrusion shape from the spring bearing. The spring bearing is redesigned to have a simple cylindrical shape without protrusions, eliminating the complex magnetic field patterns while maintaining the essential function of supporting the coil spring and providing electrical connection.
Solution Approach 2:
Instead of adding a protrusion to the spring bearing to control magnetic fields, the patent inverts the approach by using a simplified cylindrical shape and relying on the natural magnetic field distribution. The focus shifts from modifying the bearing shape to managing the overall electrical connection and grounding path.
2Reliability
If a spring bearing having a protrusion shape is provided to support the coil spring, then the coil spring can be properly positioned and supported, but the manufacturing costs and device complexity increase
Solution Approach 1:
The patent adopts a simple cylindrical spring bearing that can be manufactured using standard, cost-effective processes. The simplified geometry allows for easier machining and manufacturing without requiring complex tooling or multiple operations, thereby reducing production costs while maintaining adequate support functionality.
Solution Approach 2:
The patent separates the functions of the spring bearing into distinct, simple geometric features. The cylindrical shape provides support, while the electrical connection is achieved through the conductive material itself, eliminating the need for integrated protrusions or complex multi-functional designs.
3Reliability
If the coil spring extends over the front side and back side of the circuit board, then the static electricity removing path is established, but magnetic field lines penetrate the circuit board causing electromagnetic induction issues
Solution Approach 1:
The patent introduces the conductive bypass portion as an intermediary element that provides an alternative path for electrical current. This bypass portion extends over the circuit board, allowing static electricity to be discharged while the conductive material shields and redirects magnetic field lines, reducing their direct penetration into the circuit board.
Solution Approach 2:
The patent modifies the physical parameters of the spring bearing, specifically its shape and electrical conductivity characteristics. By using a conductive material with appropriate properties and a cylindrical geometry, the magnetic field distribution is altered to reduce harmful induction effects while maintaining the static electricity discharge function.
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
This configuration simplifies the design, reduces magnetic field interference with the circuit board, and avoids the complications and costs associated with protrusion-shaped spring bearings, while effectively discharging static electricity.
Implementation Method 1
the spring member includes a spring deformation portion that enables spring deformation such that neighboring wires of the spring member move toward or away from each other by winding the neighboring wires in a noncontact state and a conductive bypass portion that is formed continuously from at least one end of the spring deformation portion and extends over the front and back sides of the circuit board
Implementation Method 2
when a current flows in the coil spring, magnetic field lines penetrating the circuit board are formed and a conductive portion on the circuit board may be adversely affected due to electromagnetic induction based on the magnetic field lines
Data Source
AI summary
A pump device (10) includes: a drive unit (30); a cover body (150); a circuit board (130) which faces the cover body (150) and the drive unit (30) in an electrically non-contact state therewith; and a spring member (160) disposed across front and rear sides of the circuit board (130) and in contact with the cover body (150) and the drive unit (30) in an electrically conductive state. The drive unit (30), the spring member (160) and the cover body (150) constitute a static elimination path. The spring member (160) comprises: a spring deformation part (163) which enables spring deformation such that neighboring wires (161) can move toward or away from each other; and an electrically conductive bypass path (162) which is continuously disposed with at least one end of the spring deformation part (163) and is positioned across the front and rear sides of the circuit board (130).