CPAP Electrical Connection Water Intrusion Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing CPAP devices face issues with undesired short circuits due to water reaching the electrical contacts when used in conjunction with the base unit, causing connectivity problems between the main and base units.
Innovation Solution
The design incorporates a configuration where the main unit and base unit have electrical connection portions with specific peripheral structures that prevent water from entering the connection areas, utilizing a recess in the main unit and a protrusion in the base unit to create a capillary effect that keeps water away from the electrical terminals, ensuring reliable electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the main unit and base unit are electrically connected by bringing electrical contacts into contact with each other, then electrical connectivity between units is achieved, but water may reach the electrical contacts and cause undesired short circuit
Solution Approach 1:
The electrical connection interface is segmented into multiple connection terminals arranged in a specific pattern. By dividing the connection structure into separate terminals rather than a single contact point, the design allows for selective positioning of hydrophobic structures around specific terminals, preventing water from reaching any individual contact while maintaining overall connectivity
Solution Approach 2:
A hydrophobic substance is introduced as an intermediary between the electrical contacts and the water environment. This substance forms a protective barrier that repels water while allowing electrical signals to pass through, effectively mediating between the electrical connection function and the water resistance requirement
2Ease of operation
If electrical contacts are exposed from the housing for connection, then electrical connection between main unit and base unit is enabled, but water can easily reach and contaminate the exposed contacts
Solution Approach 1:
Different regions of the connection interface are given different properties: the electrical contacts remain exposed for easy connection, while specific peripheral regions around selected contacts are treated with hydrophobic substances. This local differentiation allows the exposed contacts to maintain ease of connection while the hydrophobic regions provide targeted water protection
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 suppresses short circuits by maintaining dry conditions around the electrical terminals, enhancing the reliability and safety of the CPAP device's operation even when used with water present in the base unit.
Implementation Method 1
at least a portion of the outer surface of the protrusion is coated with a hydrophobic substance
Implementation Method 2
utilizing a recess in the main unit and a protrusion in the base unit to create a capillary effect that keeps water away from the electrical terminals
Data Source
AI summary
A CPAP device includes a main unit including a first electric circuit including a blower and a connection terminal connected to the first electric circuit, and a base unit connectable to the main unit, including a blower tube, a second electric circuit different from the first electric circuit, and a connection terminal connected to the second electric circuit. The main unit has a first electrical connection portion including an exposed portion of the connection terminal and a first peripheral portion surrounding the first electrical connection portion. The base unit has a second electrical connection portion including an exposed portion of the connection terminal and a second peripheral portion surrounding the second electrical connection portion.