Flowrate Control Device with Conical Adjusting Surface
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Solution Overview
Problem
Existing flowrate control valves face challenges in maintaining constant fluid flow due to friction from seal rings, unpredictable diaphragm forces, high manufacturing complexity, and increased risk of seizure from impurities, along with inaccurate spring force calculations leading to variations in flowrate.
Innovation Solution
A flowrate-control device featuring a conical adjusting surface tilted with respect to the longitudinal axis, which varies the inlet section area in response to changing forces, minimizing pressure differences and ensuring precise flowrate control with reduced risk of seizure and manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a seal ring is provided between the adjusting element and cartridge body to prevent leaks, then sealing reliability is improved, but friction increases which adversely affects and delays the movement of the adjusting element, further reducing the sensitivity of the valve with negative effects on operating precision
Solution Approach 1:
The patent removes the seal ring entirely from the system. Instead of trying to improve the seal ring design, the invention extracts this component completely and relies on the natural clearance between the adjusting element and cartridge body to allow free movement while accepting minimal leakage as an acceptable trade-off for maintaining valve sensitivity and responsiveness.
Solution Approach 2:
The patent intentionally introduces a controlled clearance (porous-like gap) between the adjusting element and cartridge body. This clearance acts as a controlled leakage path that eliminates the need for a seal ring while maintaining sufficient fluid sealing for operational purposes, thereby removing the friction source that degraded valve sensitivity.
2Reliability
If an impermeable elastic diaphragm is provided between the adjusting element and cartridge body, then sealing is improved, but the forces that the diaphragm opposes to the movement of the adjuster are difficult to foresee and influence the precision and operating sensitivity of the valve, and fitting the diaphragm requires additional items such as ring nuts, stops, etc, with an increase in the associated costs and manufacturing complexity
Solution Approach 1:
The patent extracts the elastic diaphragm and all its associated mounting components (ring nuts, stops, etc.) from the system. By removing this complex sealing arrangement, the invention simplifies the valve structure significantly while maintaining adequate sealing through the natural clearance approach, thereby reducing manufacturing complexity and cost.
Solution Approach 2:
Instead of using a rigid impermeable barrier (diaphragm) to prevent leakage, the patent inverts the approach by intentionally allowing a controlled clearance that permits minimal leakage. This inverted sealing strategy eliminates the need for complex diaphragm assemblies and their mounting hardware.
3Device complexity
If minimum clearance is provided between the adjusting element and cartridge body to dispense with seal rings and diaphragms, then device complexity is reduced, but costly and demanding high levels of machining precision are required, and the minimum clearance would also constitute a high risk of seizure due to the impurities or detritus inevitably present in the water in circulation
Solution Approach 1:
The patent applies a clearance that is larger than the minimum theoretical requirement, intentionally providing excessive clearance compared to precision-fit designs. This excessive clearance approach deliberately sacrifices some sealing efficiency to avoid the need for high-precision machining, making the device simpler to manufacture while accepting controlled leakage as a reasonable trade-off.
4Force
If the spring is placed outside the plug as in US3156262, then the spring can exert compression force on the valve-body, but the longitudinal length of the elongated valve-case becomes very relevant, thus making this flow-control valve rather cumbersome
Solution Approach 1:
The patent nests the spring inside the plug structure rather than placing it outside. The spring is positioned within the internal cavity of the plug, allowing it to exert compression force on the valve-body while occupying minimal external space. This nested arrangement eliminates the need for a lengthy valve-case extension, thereby compacting the overall longitudinal dimensions of the valve assembly.
Solution Approach 2:
Instead of extending the valve-case longitudinally to accommodate the spring externally, the patent repositions the spring into the radial dimension by placing it within the plug's internal cavity. This dimensional relocation allows the spring to function without increasing the valve's longitudinal length, effectively using the plug's internal volume to house the spring mechanism.
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 device achieves constant fluid flow with improved sensitivity and reliability, reducing the risk of seizure and maintaining precise flowrate control across varying pressure conditions without the need for costly machining precision or additional components.
Implementation Method 1
counter spring means (11) suitable for exerting a contrasting force (Fc) on said shutter element (6)
Implementation Method 2
said section-varying means (12) are configured for reducing the area of said inlet section (Si) with the increase of the value of said contrasting force (Fc)
Data Source
Figure 1
Figure 2~3
Figure 4A~4B
AI summary
A flowrate control device for a fluid (W), comprises: - a cartridge body (2) defining a path (P) for the fluid and having an upstream portion (3), for the entry of said fluid (W), and a downstream portion (4) provided with an outlet opening (5) for the fluid (W), - a shutter element (6) housed slidingly along a longitudinal axis (A) in the cartridge body (2), and movable between an upstream end (7) of the cartridge body (2), to which a minimum throttling position corresponds for the fluid (W), and a downstream end (8) of the cartridge body (2), to which a maximum throttling position corresponds for the fluid (W), - the shutter element (6) being provided with a throttling wall (9) arranged downstream for throttling in a controlled manner the outlet opening (5), and with an upstream wall (10) cooperating with the upstream portion (3) of the cartridge body (2) for bounding an inlet section (Si) for the fluid (W); - counter spring means (11) suitable for exerting a contrasting force (FC) suitable for arranging the shutter element (6) towards the upstream end (7). There are further provided section- varying means (12, 50) for increasing or decreasing the area of the inlet section (Si) according to the variation of the contrasting force (Fc) due to the movement of the shutter element (6) along the longitudinal axis (A). The section- varying means (12) in addition to taking account of the non-constancy of the force (FC) of the counter spring means (11) in order to ensure a constant flowrate, in one embodiment, also has the additional function of minimising the operating minimum pressure difference (ΔΡηιίη) and controlling the relation between the flowrate and the aforesaid operating minimum pressure difference.