Cam-Driven Water Pump Structure for Quieter Oral Irrigators
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Solution Overview
Problem
Existing oral irrigators suffer from gear-driven structures that generate loud noise during operation, which affects the user experience.
Innovation Solution
A water pump structure with a cam-driven mechanism that includes a seat body, cam, connecting rod, and driving member, where the cam rotates in the connecting rod to drive the connecting rod and piston for reciprocating motion, reducing noise by aligning the sliding groove direction with the piston's movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a gear-driving structure is used to drive the piston for reciprocating motion, then the transmission function is achieved, but loud noise is generated during operation
Solution Approach 1:
The patent extracts the noise-generating gear transmission mechanism from the system and replaces it with a cam-driven mechanism. The cam structure converts rotational motion directly into reciprocating motion of the piston through geometric constraints, eliminating the need for gears and significantly reducing operational noise while maintaining the required transmission function.
Solution Approach 2:
Instead of using a gear mechanism to transmit rotational motion to the piston, the patent inverts the approach by using a cam profile that directly imprints the desired reciprocating motion pattern onto the piston through its geometric shape. The cam's contour is designed to convert continuous rotation into the specific reciprocating motion pattern needed, reversing the conventional transmission logic.
2Object-generated harmful factors
If the sliding groove opening direction is aligned with the piston moving direction, then collision between piston and cavity walls is minimized, but the mechanism complexity increases
Solution Approach 1:
The patent creates an equipotential operational state by aligning the sliding groove's opening direction with the piston's moving direction. This alignment ensures that the piston moves smoothly through the chamber without encountering lateral constraints or collisions with the cavity walls, effectively eliminating impact noise while the cam mechanism itself manages the directional control.
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 cam-driven mechanism effectively reduces noise during operation by minimizing collisions between the piston and cavity walls, providing a quieter and more efficient cleaning experience.
Implementation Method 1
the cam rotating in the connecting rod can drive the connecting rod to make reciprocating motion
Implementation Method 2
the piston is provided in the movable cavity and is in sliding fit with an inner wall of the movable cavity
Data Source
AI summary
A water pump structure and an oral irrigator are provided. The water pump structure includes a pump body; a sleeve partially in the pump body and having a movable cavity; a piston assembly including a piston and a connecting member having one end connected thereto; and a driving assembly including a seat body, a connecting rod having a sliding groove and connected to the other end of the connecting member, a cam rotatably provided in the connecting rod and having one end fixed on the seat body, and a driving member having an output end passing through and fixed to the seat body. The piston is in sliding fit with the movable cavity's inner wall; the cam's end, away from the seat body, is provided with a protrusion in sliding fit with an inner wall of the sliding groove whose opening direction is same as the piston's moving direction.