Cartridge Faucet Valve With Expandable Stem for Tailored Torque
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Solution Overview
Problem
Existing faucet valve technologies lack the ability to provide tailored torque and frictional resistance, limiting the design flexibility of faucet handles in terms of size, shape, and weight, which restricts aesthetic and operational improvements.
Innovation Solution
The development of a cartridge valve assembly with a stem adapter and stem assembly that includes a spherical portion capable of expanding in size, and a plug assembly with adjustable screws to increase frictional resistance, allowing for tailored torque and improved handle operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing faucet valve technologies are used, then the valve structure is simple, but the design flexibility of faucet handles in terms of size, shape, and weight is limited
Solution Approach 1:
The valve is divided into multiple independent components including a cartridge body, stem adapter, stem assembly with spherical portion, and plug assembly. This segmentation allows each component to be optimized independently for specific functions while maintaining overall system flexibility for various handle designs.
Solution Approach 2:
The spherical portion of the stem assembly is designed to be expandable, transitioning from a clearance fit to an interference fit within the stem adapter. This dynamic adjustment capability enables tailored torque and frictional resistance to be achieved without requiring complex fixed-structure mechanisms, thereby supporting diverse handle designs.
2Ease of operation
If a fixed frictional resistance is used in the valve, then the valve structure is simple, but the torsional friction and smoothness of handle operation cannot be optimized
Solution Approach 1:
The spherical portion expands from a clearance fit to an interference fit within the stem adapter, dynamically adjusting the frictional resistance. This allows optimization of torsional friction for smooth handle operation without requiring complex mechanical friction control mechanisms.
Solution Approach 2:
The fit between the spherical portion and stem adapter changes from clearance to interference fit, altering the friction parameter. This parameter change enables tailored torque and optimized operational smoothness while maintaining a relatively simple valve internal structure.
3Reliability
If a spherical portion that expands in size is used, then tailored torque and frictional resistance are achieved, but the manufacturing complexity increases
Solution Approach 1:
The spherical portion's dimensional parameter changes from clearance to interference fit through controlled expansion. This parameter change achieves reliable tailored torque control while using a relatively simple expandable mechanism that can be manufactured with standard machining processes.
Solution Approach 2:
The use of a spherical portion provides geometric advantages for uniform expansion and consistent contact with the stem adapter. This spherical geometry simplifies manufacturing compared to other expandable shapes while achieving reliable torque control through the interference fit mechanism.
4Adaptability or versatility
If existing valve technologies are used, then the valve is easy to manufacture, but aesthetic and operational improvements are restricted
Solution Approach 1:
The cartridge valve assembly is segmented into independent components (cartridge body, stem adapter, stem assembly, plug assembly) that can be manufactured and optimized separately. This allows aesthetic improvements in handle design without requiring complete redesign of the entire valve system.
Solution Approach 2:
The expandable spherical portion provides dynamic torque control that enables a wider range of handle weights, sizes, and shapes. This dynamic mechanism supports aesthetic improvements in handle design while maintaining a manageable cartridge valve assembly complexity.
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 solution enables faucet handles to be designed with greater flexibility in size and shape, providing improved torsional friction, smoothness, and comfort, while supporting longer and heavier handles, and allowing for easier retrofitting into existing systems.
Implementation Method 1
The spherical portion is configured to expand in size (e.g., diametrically) in response to the first end inserting a portion of the body of the second stem component into the opening in the first stem component, which increases a frictional resistance induced by relative rotation between the stem assembly and the stem adapter
Implementation Method 2
a screw configured to be threaded in the bore and configured to compress the plug against the stem assembly in response to tightening the screw to increase a normal force between the plug and the stem assembly
Data Source
AI summary
A cartridge valve includes a housing, a stem adapter, and a stem assembly. The stem adapter includes a body defining a first hole, which extends in a longitudinal direction. The stem assembly includes a first stem component and a second stem component. The first stem component includes an arm and a spherical portion that is configured to be at least partially positioned within the first hole and defines an opening. The second stem component has a body that is configured to be at least partially received within the opening of the first stem component. The spherical portion is configured to expand in size in response to the first end inserting a portion of the body of the second stem component into the opening in the first stem component, which increases a frictional resistance induced by relative rotation between the stem assembly and the stem adapter.