Plastic Inner Part Thermostatic Valve Integration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Sanitary fittings with brass thermostatic valves are complex and expensive, leading to loosening issues when installed in plastic housings, and existing solutions complicate assembly and increase manufacturing costs.
Innovation Solution
A sanitary fitting design where the thermostatic device is integrated into a plastic inner part within a plastic or metal fitting housing, with a firmly connected housing element defining a control gap to simplify assembly and reduce parts and costs, allowing pre-assembly of waterway components before installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a brass cartridge is screwed into a plastic valve body with high torque, then the thermostatic valve can be securely installed, but the screw connection loosens after a short time or after just a few temperature changes
Solution Approach 1:
The patent integrates the thermostatic valve directly into the plastic inner part by forming the thermostatic valve housing as an integral component of the plastic inner part, eliminating the separate screw connection between brass cartridge and plastic valve body. This merging of components removes the interface that causes loosening while maintaining secure installation.
2Reliability
If a brass housing cartridge is used, then the thermostatic valve functions reliably, but the assembly becomes complex and expensive
Solution Approach 1:
The patent combines the thermostatic valve housing with the plastic inner part into a single integrated component, reducing the number of separate parts from multiple components (brass cartridge, plastic valve body, seals, screws) to fewer integrated components. This maintains thermostatic functionality while simplifying assembly and reducing manufacturing complexity.
Solution Approach 2:
The plastic inner part serves multiple functions simultaneously: it forms the valve body housing, creates water pathways, provides structural support, and integrates the thermostatic valve housing. This multi-functionality reduces the overall component count and assembly complexity while maintaining reliability.
3Reliability
If a brass housing cartridge is used, then the thermostatic valve is durable, but the manufacturing costs increase
Solution Approach 1:
The patent replaces expensive brass housing with a plastic inner part that is economically manufactured through injection molding. While plastic may be perceived as less durable than brass, the integrated design and appropriate material selection maintain sufficient durability for the application while dramatically reducing manufacturing costs.
Solution Approach 2:
The patent changes the material parameter from brass to plastic for the inner part housing, and changes the manufacturing process parameter from machining/assembly to injection molding. This parameter change reduces material cost and manufacturing complexity while maintaining the required functional durability through proper material selection and design.
4Ease of operation
If components are pre-assembled before installation, then assembly is simplified, but the control gap stability may be compromised
Solution Approach 1:
By integrating the thermostatic valve housing as an integral part of the plastic inner part through injection molding, the patent ensures that the control gap dimensions are determined by the precision of the molding process rather than by assembly tolerances. This merging maintains control gap stability while enabling pre-assembly and simplifying installation.
Data Source
Figure 1~2
AI summary
The invention relates to a sanitary fitting (1) comprising a fitting housing (2) and a plastic inner part (3) which is at least partially inserted into the fitting housing (2), wherein the plastic inner part (3) forms at least one water path (4) in the fitting housing (2), wherein at least a part of a thermostatic device (5) of the sanitary fitting (1) is formed in the plastic inner part (3), and wherein a housing element (6) of the thermostatic device (5) which is arranged at least partially in the plastic inner part (3) and whose relative position to the plastic inner part (3) defines a control gap (7) of the thermostatic device (5) is firmly connected to the plastic inner part (3).