Thermostatic Faucet Plastic Inner Body Thermal Insulation
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Solution Overview
Problem
Most thermostatic faucets are expensive due to copper materials and pose a scalding risk due to high thermal conductivity, with existing solutions either reducing copper usage but still risking water leakage or not fully addressing the scalding issue.
Innovation Solution
A thermostatic faucet design featuring a metal housing with a plastic inner body that forms integral water passages, a shelf board to shield the hot water inlet, and radial seal connections to reduce parts and manufacturing costs while preventing scalding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If copper material is used for the faucet body, then thermal conductivity is good and hot water can be controlled, but the surface temperature becomes too high and scalds the user
Solution Approach 1:
The faucet is divided into separate functional components: a copper inner body for water control and an outer housing for structural support and insulation. The copper inner body is segmented from the outer housing, allowing thermal management while maintaining functionality.
Solution Approach 2:
A plastic inner body acts as an intermediary between the copper water control components and the external environment. This plastic intermediary has poor thermal conductivity, blocking heat transfer from hot water to the outer surface, thus preventing scalding while allowing water flow control.
2Device complexity
If multiple components are used to form the hot water passage, then the faucet structure is flexible, but the risk of water leakage increases
Solution Approach 1:
Multiple water passage functions (hot water inlet, cold water inlet, mixed water outlet) are merged into a single integrated plastic inner body component. This eliminates multiple connection interfaces between separate components, thereby reducing water leakage risk while maintaining structural flexibility.
Solution Approach 2:
The plastic inner body serves multiple functions simultaneously: it acts as a thermal insulator, forms all water passages (hot and cold inlets, mixed outlet), provides structural support, and prevents scalding. This multi-functionality reduces the need for separate components.
3Temperature
If copper pipe is used as independent hot water inlet passage, then thermal conductivity is maintained, but the faucet body scalds the user
Solution Approach 1:
The plastic inner body serves as a thermal intermediary that allows hot water to pass through while blocking heat transfer to the outer housing. It maintains the thermal properties needed for water control while preventing scalding contact.
Solution Approach 2:
Different parts of the faucet have different thermal properties: the copper components maintain good thermal conductivity for water control, while the plastic inner body and outer housing provide thermal insulation. This local differentiation of material properties solves the scalding problem while preserving hot water functionality.
4Ease of manufacture
If all-plastic inner core structure is used, then copper usage is reduced and cost is lowered, but water leakage risk increases
Solution Approach 1:
All water passages are merged into a single molded plastic inner body component, eliminating multiple assembly interfaces. This integrated design reduces water leakage risk while maintaining the cost advantages of plastic material usage.
Solution Approach 2:
Traditional mechanical assembly of multiple copper or plastic components is replaced with a single molded plastic inner body structure. This substitution eliminates assembly-related leakage risks while maintaining manufacturing cost benefits.
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 design effectively reduces manufacturing costs, simplifies assembly, and minimizes the risk of water leakage and scalding by using a metal housing not in contact with water and a thermally insulating plastic inner body with a shelf board to shield the hot water inlet.
Implementation Method 1
a thermally insulating plastic inner body with a shelf board to shield the hot water inlet
Implementation Method 2
The metal housing includes a front housing and a rear end cover to mate with each other. The front housing is formed with a shelf board. The shelf board shields upper ends of the first water inlet connector and the second water inlet connector.
Data Source
Figure 1
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AI summary
A thermostatic faucet for placing an article thereupon comprises a plastic inner body (1) and a metal housing (2). The metal housing (2) is not in contact with water. The plastic inner body (1) is in contact with water. The plastic inner body (1) plays the role of thermal insulation, so that the heat of the hot water passage won't be conducted to the metal housing (2). The metal housing (2) is formed with a shelf board (23). The shelf board (23) shields a water inlet end, which effectively avoids the risk of scalding when the hot water passes through the water inlet end and realizes the complete anti-scald function of the thermostatic faucet body. In the thermostatic faucet, a cold water passage, a hot water passage, a mixed water passage and a water outlet passage are integrally formed in the plastic inner body (1). The parts are reduced, the production process is simplified, the manufacturing cost of the thermostatic faucet is lowered, and the risk of water leakage generated by the multiple components is reduced.