Water Flosser Pump Eccentric Drive Eliminates Piston Noise

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Solution Overview

Problem

Conventional water flosser pumping devices generate significant collision noise and have high starting resistance due to the spherical connection between the connecting rod and piston, leading to increased manufacturing costs and potential damage from assembly clearance and friction.

Innovation Solution

A water pumping device with a transmission assembly featuring a first transmission member rotatably connected to a mounting base, a connecting member that reciprocates in a specific direction, and a piston, where the first transmission member is eccentrically disposed to drive the connecting member and piston to reciprocate without swinging, reducing noise and resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a connecting rod with spherical connection is used to drive the piston to reciprocate, then the transmission function is achieved, but collision noise is generated and starting resistance is large

Engineering Contradiction:

Improvetransmission functionVSAvoidcollision noise

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent extracts and eliminates the spherical connection structure from the system. By replacing the conventional connecting rod with a flat connection structure, the spherical fit that causes collision noise and friction is removed, directly solving the harmful effects while maintaining the transmission function.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of using a spherical connection that allows multi-directional movement, the patent inverts the approach by using a flat connection that constrains movement to a single plane. This inversion of the connection geometry eliminates the collision noise and starting resistance issues.

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If a spherical connection is used between the connecting rod and piston, then the transmission function is achieved, but assembly clearance and friction cause potential damage

Engineering Contradiction:

Improvetransmission functionVSAvoidresistance to friction damage

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent removes the spherical connection structure that generates friction and assembly clearance issues. By adopting a flat connection, the harmful frictional forces are eliminated, preventing damage while maintaining reliable transmission.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent substitutes the mechanical spherical connection system with a flat connection system. This replacement eliminates the complex spherical fit that causes friction and clearance problems, providing a more reliable transmission mechanism.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If the connecting rod swings to drive the piston to reciprocate, then the transmission function is achieved, but the device complexity increases

Engineering Contradiction:

Improvetransmission functionVSAvoidstructural complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts and removes the swinging motion capability from the connecting rod. By constraining the connection to flat, linear movement only, the structure is simplified while maintaining the essential transmission function, reducing device complexity.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of allowing the connecting rod to swing in multiple directions, the patent inverts the approach by constraining movement to a single flat plane. This simplification reduces structural complexity while preserving the transmission function.

Inventive Principle:

Principle #13The other way round (Inversion)

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 effectively reduces collision noise and manufacturing costs while preventing damage from friction-induced clearance increase, ensuring reliable long-term operation by eliminating relative movement between the connecting member and piston.

Implementation Method 1

a first transmission member rotatably connected to the mounting base about a first rotation axis, and the first transmission member being eccentrically disposed with respect to the first rotation axis

Methodology Applied

Scientific EffectEccentric mechanism: Eccentric

Data Source

PatentUS12127897B2Water pumping device for water flosser and water flosser

Publication Date: 2024.10.29 NICEFEEL MEDICAL DEVICE TECH CO LTD

AI summary

The present disclosure relates to a water pumping device for a water flosser, which includes a mounting base, a transmission assembly, a connecting member, and a piston. The transmission assembly includes a first transmission member. The connecting member is disposed in the mounting base in a reciprocally movable manner in a first direction. The first transmission member is rotatable about a first rotation axis perpendicular to the first direction, and in mating connection with the connecting member. The first transmission member is eccentrically disposed with respect to the first rotation axis. During a rotation of the first transmission member about the first rotation axis, the first transmission member reciprocates in the first direction, so as to drive the connecting member to reciprocate in the first direction. The reciprocation of the connecting member in the first direction can drive the piston to reciprocate in the first direction.