Thermostatic Faucet Plastic Inner Body Thermal Insulation
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Solution Overview
Problem
Existing thermostatic faucets made of copper are costly and prone to scalding due to high thermal conductivity, and previous designs with plastic inner cores face issues of water leakage and reduced strength performance.
Innovation Solution
A thermostatic faucet with a plastic inner body in contact with water and a metal housing not in contact with water, featuring integrally formed water passages and connectors within the plastic body, reducing parts and assembly complexity, and using metal threads for enhanced strength and leak resistance.
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 body is segmented into two distinct parts: a copper inner core structure that contacts water and controls temperature, and a plastic outer housing that provides thermal insulation. This segmentation allows the copper to maintain its thermal conductivity for water control while the plastic layer prevents heat transfer to the user's hand, resolving the scalding risk without compromising temperature control functionality.
Solution Approach 2:
The plastic outer housing acts as an intermediary thermal insulation layer between the copper inner core and the user's hand. This intermediary structure blocks heat transfer from the hot copper surface to the user, eliminating the scalding hazard while allowing the copper core to continue functioning for precise temperature control.
2Object-affected harmful factors
If copper pipe is used as independent hot water inlet passage not in contact with outer housing, then scalding is prevented, but multiple connectors are needed which increases water leakage risk and manufacturing cost
Solution Approach 1:
The hot water inlet passage, cold water inlet passage, and outer housing are merged into a single integrated plastic outer housing structure. This eliminates the need for separate copper pipes and multiple water inlet/outlet connectors, reducing the number of connection points and thereby lowering the risk of water leakage while maintaining scalding prevention through the plastic's thermal insulation properties.
Solution Approach 2:
The faucet employs a composite structure where the plastic outer housing serves dual functions: providing thermal insulation to prevent scalding and forming the water passage structure. This composite design replaces the traditional separate copper pipe and plastic housing configuration, reducing connector数量 and assembly complexity while achieving both scalding prevention and simplified water flow paths.
3Device complexity
If stress part is centralized on plastic inner core with screw thread connections, then assembly is simplified, but strength performance is reduced and water leakage occurs easily
Solution Approach 1:
The connection structure is segmented between the plastic outer housing and the copper inner core assembly. The plastic outer housing contains integrated connectors that mate with corresponding interfaces on the copper inner core, distributing stress across multiple contact points rather than concentrating it on screw threads. This segmentation maintains assembly simplicity while enhancing strength and leak resistance.
Solution Approach 2:
The design uses precision-machined mating interfaces between the plastic outer housing and copper inner core that replicate the functional benefits of screw thread connections without the weakness of plastic threads. The integrated connectors feature robust geometric shapes that provide sufficient threading engagement and stress distribution, copying the simplicity of threaded assembly while avoiding the strength limitations of plastic screws.
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 solution prevents scalding by thermal insulation, lowers manufacturing costs, and reduces the risk of water leakage by distributing stress points away from the plastic inner body and utilizing stronger metal threads.
Implementation Method 1
the thermal conductivity of a copper material is good. When in use, hot water easily makes the surface temperature of the faucet body too high. The faucet body may scald the user.
Data Source
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AI summary
A thermostatic faucet comprises a metal housing (1) and a plastic inner body (2). The plastic inner body (2) is provided with a first water inlet connector (21), a second water inlet connector (22) and a water outlet connector. The first water inlet connector (21) is connected with a plastic shaft seat (4) through a chamber of the plastic inner body (2) to form a first water inlet passage. The second water inlet connector (22) is connected with the plastic shaft seat (4) to form a second water inlet passage. The first water inlet passage is a hot water passage or a cold water passage, correspondingly, the second water inlet passage is a cold water passage or a hot water passage. The metal housing (1) is not in contact with water. The plastic inner body (2) is in contact with water. The plastic inner body (2) plays the role of thermal insulation, so that the thermostatic faucet won't scald the user. In the thermostatic faucet, the cold water passage, the hot water passage, a mixed water passage and a water outlet passage are integrally formed in the plastic inner body (2). The plastic inner body (2) has the first water inlet connector (21), the second water inlet connector (22) and the water outlet connector. 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.