Indoor Unit Pipe Joint Structure for Electrolytic Corrosion Prevention
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Solution Overview
Problem
Existing indoor air conditioner units face challenges in preventing electrolytic corrosion at the connection points between refrigerant pipes made of different metals, such as aluminum and copper, which can lead to dew condensation and corrosion issues.
Innovation Solution
The indoor unit design incorporates refrigerant pipes made of aluminum and copper, with connection points formed of copper alloys, ensuring that the connection points are not covered with heat-insulating materials to prevent dew condensation and using waterproof tubes to manage any condensation, thereby reducing the risk of electrolytic corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If refrigerant pipes made of different metals (aluminum and copper) are connected, then the refrigerant system can be constructed with different material properties, but electrolytic corrosion occurs at the connection points due to dew condensation
Solution Approach 1:
The patent introduces a waterproof tube as an intermediary component that covers the connection point between aluminum and copper refrigerant pipes. This waterproof tube prevents dew condensation water from directly contacting the connection point, thereby eliminating the electrolytic corrosion pathway while allowing the use of different metal materials for the pipes
Solution Approach 2:
The patent extracts the harmful element (dew condensation water) from the connection point area by using a waterproof tube to redirect or contain the condensation water away from the metal connection interface, preventing it from causing electrolytic corrosion
2Loss of energy
If connection points are covered with heat-insulating materials to prevent dew condensation, then thermal insulation is improved, but electrolytic corrosion risk increases due to moisture accumulation
Solution Approach 1:
The waterproof tube serves as an intermediary that replaces traditional heat-insulating materials covering the connection point. Instead of using insulating materials that trap moisture, the waterproof tube allows thermal exchange while preventing direct contact between condensation water and the connection point, thus avoiding electrolytic corrosion
3Reliability
If waterproof tubes are added to manage condensation, then corrosion protection is improved, but device complexity increases
Solution Approach 1:
The patent uses a waterproof tube, which is a flexible shell structure, to cover and protect the connection point. This thin-walled protective structure effectively prevents corrosion while adding minimal structural complexity to the overall refrigerant pipe system
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 configuration effectively prevents electrolytic corrosion by ensuring that dew condensation water does not accumulate and flow between the pipes, maintaining the integrity of the refrigerant system and reducing maintenance needs.
Implementation Method 1
a second refrigerant pipe formed of a second metal having a smaller ionization tendency than an ionization tendency of the first metal of the first refrigerant pipe
Data Source
AI summary
An indoor unit includes a casing, a heat exchanger accommodated in the casing, and connection pipe, connected to the heat exchanger, through which a refrigerant flows. The connection pipe includes a first refrigerant pipe made of a first metal and a second refrigerant pipe made of a second metal higher in potential than the first metal. One end of the first refrigerant pipe is connected to the heat exchanger, and the other end of the first refrigerant pipe is connected to one end of the second refrigerant pipe in the casing.