Rotating-Casing Thermostatic Cartridge for Direct Flow Control
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Solution Overview
Problem
Traditional thermostatic cartridges with central control rods face integration difficulties in certain tap designs, limiting the control of thermostatic regulation temperature and causing friction between components.
Innovation Solution
The thermostatic cartridge uses the casing, which defines the mixing chamber, as the control member, allowing it to rotate and be driven from outside, eliminating the need for a central control rod and reducing friction by enabling a direct hydraulic path and joint rotation of all components with the casing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a central control rod is used to control the thermostatic regulation temperature, then the adjustment mechanism can be actuated from outside the casing, but the cartridge faces integration difficulties in certain tap designs and causes friction between components
Solution Approach 1:
The patent removes the central control rod from the cartridge structure and extracts its control function to the outer periphery of the casing. The control element is now located at the periphery rather than the center, eliminating the need for a central rod that passes through the mixing chamber and causes friction with internal components.
Solution Approach 2:
The control mechanism is moved from a central axial position to a peripheral radial position. The control element is arranged at the outer periphery of the casing, allowing actuation from the side rather than from the top through the center, thus changing the dimensional approach to control.
2Ease of operation
If a central control rod is used, then the adjustment mechanism can be actuated, but friction occurs between the control rod and other components
Solution Approach 1:
The control rod is completely removed from the system. Its function is transferred to a peripheral control element that actuates the adjustment mechanism through the wall of the casing, eliminating all friction between a central rod and the mixing chamber or other internal components.
Solution Approach 2:
The casing wall itself serves as an intermediary, transmitting the control force from the peripheral control element to the adjustment mechanism without requiring a physical rod to pass through the internal components. This eliminates friction while maintaining the force transmission function.
3Ease of operation
If a traditional control rod arrangement is used, then thermostatic regulation can be controlled, but the hydraulic path is not direct
Solution Approach 1:
The central control rod that obstructed the hydraulic path is removed. The control function is extracted and relocated to the periphery, allowing the hydraulic flow to pass through the center of the mixing chamber without obstruction, thus achieving a direct hydraulic path.
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 design allows for effective control of thermostatic regulation temperature without a central control rod, reducing friction and facilitating integration into various tap designs while maintaining a direct hydraulic path, enhancing the cartridge's operational efficiency and ease of assembly.
Implementation Method 1
a heat-sensitive body, which is secured to the slide valve and which is arranged to be in contact with the mixed fluid, and a piston, the heat-sensitive body and the piston moving relative to one another along the axis as a function of the temperature of the mixed fluid
Data Source
AI summary
A thermostatic cartridge includes: a casing at least partially within and locked translationally along an axis a cartridge body that delimits a chamber, a hot and cold fluid inlet passages and a mixed fluid outlet passage; a slide valve regulating the temperature of the mixed fluid displaceable along the axis to close, in inverse proportions, the inlet passages; a thermostatic element; and a mechanism for adjusting a thermostatic regulation temperature mechanically and displaceably connected to the body and to secure the position of the piston of the element along the axis and to alter the piston position by actuating the adjustment mechanism to move relative to the body. To control the regulation temperature, the casing is rotationally mounted on the body such that the adjustment mechanism is actuated when the casing is between positions-corresponding to extreme low and high temperature values.