Membrane Trigger Heater Thermal Insulation Design
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Solution Overview
Problem
Existing dispensing devices with heat rupturable membranes face issues due to heat loss and deformation, leading to premature heater damage and uncontrolled membrane rupture, especially when exposed to both the payload and external environment.
Innovation Solution
A device with a thermally insulated heater coupled to a heat rupturable membrane, where the heater is physically removed from the membrane and environment, reducing heat loss and deformation, allowing for controlled membrane rupture and efficient material dispensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the heater is disposed on or in the membrane exposed to the payload and external environment, then the heater can directly heat the membrane for actuation, but the heater experiences heat losses to the environment and payload, causing premature damage and uncontrolled rupture
Solution Approach 1:
The heater is extracted from direct contact with the membrane and removed from the harsh environment. The patent describes the heater as being 'disposed within the housing' and 'thermally coupled to the membrane' rather than directly on or in the membrane. This extraction eliminates the harmful thermal and chemical environment while maintaining the heating function through thermal coupling.
Solution Approach 2:
The patent introduces an intermediary thermal coupling mechanism between the heater and membrane. The heater is thermally coupled to the membrane through the housing structure or thermal interface materials, allowing heat transfer without direct contact. This intermediary protects the heater from the harsh environment while enabling controlled heating of the membrane.
2Use of energy by moving object
If the heater is thermally coupled to the membrane for effective heating, then heating efficiency improves, but the heater is exposed to thermal and mechanical stress from the payload and environment, leading to heater damage
Solution Approach 1:
The heater is extracted from the harsh thermal and mechanical environment created by payload exposure. By positioning the heater within the housing and thermally coupling it to the membrane rather than direct contact, the heater maintains heating efficiency while being protected from harmful thermal stress and mechanical deformation.
Solution Approach 2:
The housing structure and thermal interface materials serve as intermediaries that enable efficient heat transfer from the heater to the membrane while protecting the heater from thermal and mechanical stress. The intermediary allows decoupling of the heating function from the harsh environment.
3Reliability
If the heater is removed from the membrane and environment with thermal insulation, then heat loss is reduced and heater damage is prevented, but the heater must be thermally coupled to the membrane to ensure controlled rupture
Solution Approach 1:
The housing structure serves multiple functions: it provides mechanical support, creates the thermal coupling between heater and membrane, and offers thermal insulation. By merging these functions into a single integrated structure, the patent achieves controlled rupture reliability without significantly increasing device complexity.
Solution Approach 2:
The housing is designed as a multi-functional component that simultaneously provides structural support, thermal coupling, and thermal insulation. This universal design approach allows the heater to be thermally coupled to the membrane while protected from the environment, achieving controlled rupture without adding separate complex subsystems.
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 ensures reliable and controlled rupture of the membrane, reducing the risk of heater damage and improving the efficiency of material dispensing, even under pressurized conditions.
Implementation Method 1
a heater thermally coupled to the heat rupturable membrane
Implementation Method 2
thermally insulated from at least one of an environment surrounding the device and the reservoir
Implementation Method 3
a heat rupturable membrane disposed within the housing and configured to selectively separate the reservoir from the outlet
Data Source
AI summary
A device may be configured with a housing having a reservoir and an outlet separated by a heat rupturable membrane. The membrane may serve to separate a material held within the reservoir from the outlet until the membrane is ruptured. The membrane may include a heater configured to selectively rupture the membrane when actuated. The heater may be physically removed and/or thermally insulated from at least one of an environment surrounding the device and the reservoir.