Thermostatic Cartridge Ring Assembly Without Snap-Ring Retention
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Solution Overview
Problem
Existing thermostatic cartridges face challenges in manufacturing cost and design constraints due to the presence of snap rings, which generate resistance and interfere with operational buttons, making it difficult to achieve reliable, efficient, and economical flow control of mixed fluids.
Innovation Solution
A thermostatic cartridge design featuring a slitted adjustment ring that is deformable along its axial dimension, allowing it to be assembled without additional axial retention parts, and includes a notch for clamping a connecting member's finger, ensuring reliable torque transmission and rotational guidance, thus enabling independent control of flow rate and temperature without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a snap ring is used to hold the adjustment ring on the housing, then the adjustment ring is retained axially, but the manufacturing cost increases and rotation resistance is generated
Solution Approach 1:
The invention extracts and eliminates the snap ring component from the assembly. The adjustment ring itself is designed with an elastic deformable structure that can be expanded to pass over the housing and then contracts to retain itself, removing the need for separate retention parts and reducing overall device complexity.
Solution Approach 2:
The adjustment ring performs its own retention function through its elastic deformable structure. When expanded, it can be installed over the housing, and when contracted, it automatically retains itself on the housing without requiring external retention mechanisms, making the system self-sufficient.
2Reliability
If a snap ring is used to hold the adjustment ring, then axial retention is achieved, but resistance to rotation is generated
Solution Approach 1:
By removing the snap ring component entirely, the source of rotation resistance is eliminated. The elastic deformable adjustment ring provides retention through its own structural properties rather than through friction or mechanical interference with a separate component.
3Reliability
If a snap ring is used for axial retention, then the adjustment ring is secured, but design constraints increase due to interference with operational buttons
Solution Approach 1:
Removing the snap ring eliminates the design constraint it imposed. The elastic deformable adjustment ring can be designed with optimal clearance dimensions without being constrained by the presence of a separate retention component, improving adaptability for operational buttons.
4Reliability
If additional retention parts are used, then axial retention is improved, but manufacturing cost increases
Solution Approach 1:
The invention extracts and eliminates additional retention parts, reducing the total component count and associated manufacturing costs. The elastic deformable adjustment ring integrates the retention function into its own structure.
Solution Approach 2:
The retention function is merged into the adjustment ring itself through its elastic deformable structure. The adjustment ring combines both its primary adjustment function and its retention function in a single integrated component, eliminating the need for separate retention parts.
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 slitted adjustment ring allows for efficient and economical flow control by eliminating the need for additional retention parts, enhancing assembly reliability and torque transmission, while maintaining independent control of flow rate and temperature, thereby improving the cartridge's overall performance.
Implementation Method 1
the adjustment ring is provided with a slit, which connects the first and second axial end to each other and which has edges spaced apart from each other in a direction peripheral to the axis, the adjustment ring being deformable by relative spacing of the edges of the slit in said direction peripheral to the axis
Implementation Method 2
the slit of the adjustment ring includes a notch which is adapted to receive a finger of the connecting member in a clamped manner along said direction peripheral to the axis when the adjustment ring is in an operational configuration
Implementation Method 3
a connecting member, which connects the adjustment ring to the control member through the housing so that the rotation of the adjustment ring about the axis causes the control member to move
Data Source
AI summary
This cartridge comprises a housing, a base, attached to the housing and enclosing a chamber for mixing a cold fluid and a hot fluid, a thermostatic control system, arranged in the chamber and capable of controlling the temperature of the mixture leaving the chamber to a setpoint temperature, and a flow rate adjustment system, suitable for adjusting the flow rate of the mixture from outside the housing. This adjustment system comprises both a control member, which is able to move at least partially inside the housing in such a way as to vary the flow rates of cold fluid and hot fluid supplying the chamber, and an adjustment ring, which is arranged outside the housing and is centred on an axis (X-X) around which this ring is able to rotate relative to the housing, the ring being connected, through the housing, to the control member, by a connecting member.