Water Dispensing Cartridge With Balanced Piston Flow Control
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Solution Overview
Problem
Existing water dispensing cartridges face issues with maintaining flow rate adjustment due to progressive rotation, inducing vibrations and requiring users to overcome both spring resistance and water pressure, leading to complex and expensive constructions.
Innovation Solution
A dispensing cartridge design featuring a snap mechanism with a balanced piston and control knob that separates flow rate adjustment from water opening/closing control, using a symmetrical piston with fins and adjustable cross-section to manage flow rates without being affected by water pressure, allowing independent operation of flow rate and activation/deactivation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a snap mechanism with balanced piston is used, then vibration and noise are eliminated, but the device complexity increases
Solution Approach 1:
The piston is designed with an asymmetric profile featuring a first portion and a second portion with different cross-sectional areas. The first portion has a smaller cross-sectional area than the second portion, creating an asymmetric geometry that generates a balancing effect. This asymmetry allows the piston to counterbalance water pressure forces internally, eliminating vibrations and noises without requiring additional external balancing mechanisms.
2Ease of operation
If the control knob is pressed to open/close water dispensing, then the user must overcome both spring resistance and water pressure, but this increases operational difficulty
Solution Approach 1:
The control mechanism is segmented into two independent functions: the control knob handles flow rate adjustment through rotation, while a separate actuation mechanism (button or lever) handles opening/closing water dispensing. This segmentation allows the user to operate flow rate adjustment without needing to overcome water pressure, as the actuation function is separated from the adjustment function. The elastic element only needs to be compressed for actuation, not for continuous flow rate control.
Solution Approach 2:
An elastic element (spring) is introduced as an intermediary between the user's actuation force and the valve closure. The spring absorbs and stores the force required to close the valve against water pressure, allowing the user to simply press the actuation element without directly overcoming the full water pressure. The spring mediates the force transmission, making the operation easier while still achieving the desired valve closure.
3Ease of manufacture
If a simple construction is used, then production cost is reduced, but the ability to maintain flow rate adjustment is compromised
Solution Approach 1:
The balancing function is merged into the piston itself through its asymmetric profile, rather than being a separate mechanism. The piston's geometry combines the flow control function and the pressure balancing function into a single component. This merging reduces the number of parts needed while maintaining the ability to hold flow rate adjustment, as the asymmetric piston naturally counterbalances water pressure to maintain the set position without requiring additional springs or counterweights.
Data Source
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AI summary
A dispensing cartridge (4) provided with a body (8) and a control knob for the relative actuation, the body (8) defining a side wall (28) which delimits a cavity (32) which houses a piston (36) provided with a connecting stem (40) to the control knob, the piston (36) extending and moving along an axial direction. The dispensing cartridge (4) comprises a mechanism (44) acting on the piston (36) so as to allow the axial movement of the piston (36) from a closed position to a dispensing position. The side wall (28) is provided with at least one inlet opening (52) adapted to be connected to a pressurized liquid and at least one outlet opening (56), said inlet (52) and outlet (56) openings being axially offset so as to be separated by an intermediate portion of the body (8). The piston (36) comprises a sealing gasket which in the closed position is axially located between the inlet opening (52) and the outlet opening (56) at said intermediate portion, and in the dispensing position is at least partially beyond the intermediate portion so as to put in said inlet and outlet openings (52, 56) in fluid communication with each other.