Two-Chamber Microwave Liquid Delivery Using Vapor Pressure Transfer
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Solution Overview
Problem
Conventional microwave ovens lack the capability to deliver liquid at a specific temperature under pressure for brewing beverages without a dedicated brewing machine, as they do not have the necessary infrastructure for heating liquids under pressure.
Innovation Solution
A device comprising two chambers within a microwave oven, where the first chamber receives more microwave energy than the second, causing the liquid to boil and create pressure that forces the second chamber's liquid through a vapor flow path to a destination, allowing for the delivery of heated liquid under pressure without an electric heating element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional microwave oven is used to heat liquid, then the liquid can be heated, but the liquid cannot be delivered under pressure at a specific temperature
Solution Approach 1:
The microwave oven is divided into two separate chambers: a first chamber for heating liquid to boiling point and generating vapor, and a second chamber for receiving vapor and delivering liquid under pressure. This segmentation allows each chamber to perform its specific function optimally, resolving the contradiction between heating capability and pressure delivery capability.
Solution Approach 2:
Vapor generated in the first chamber acts as an intermediary to transfer energy and create pressure in the second chamber. The vapor flow path connects the two chambers, allowing the heating action in the first chamber to indirectly produce the pressure needed for liquid delivery in the second chamber, thereby enabling both temperature control and pressure delivery.
2Ease of operation
If a dedicated beverage brewing machine with integral electric heating elements is used, then liquid can be delivered at a specific temperature under pressure, but the device becomes complex and requires additional infrastructure
Solution Approach 1:
The system uses the microwave oven's existing microwave generation capability to heat the liquid, eliminating the need for separate electric heating elements. The microwave energy directly heats the liquid in the first chamber, and the resulting vapor self-generates the pressure needed for delivery, making the system self-sufficient and reducing overall device complexity.
Solution Approach 2:
The system exploits the phase transition of liquid to vapor in the first chamber to generate pressure. By heating liquid to its boiling point, vapor is produced and flows to the second chamber, where it creates the necessary pressure to force liquid delivery without requiring mechanical pumps or complex pressure generation mechanisms.
3Stability of the object's composition
If microwave energy is distributed equally to both chambers, then both chambers heat uniformly, but the first chamber cannot generate sufficient vapor pressure to force liquid through the flow path
Solution Approach 1:
The microwave energy distribution is made non-uniform by design: the first chamber is configured to receive a first amount of microwave energy while the second chamber receives a second amount, creating a localized concentration of heating energy in the first chamber. This local quality difference ensures that the first chamber generates sufficient vapor pressure while the second chamber maintains appropriate temperature for liquid delivery.
Solution Approach 2:
The two chambers are designed with asymmetric microwave energy reception: the first chamber receives more microwave energy to generate vapor pressure, while the second chamber receives less energy to maintain liquid phase and delivery temperature. This asymmetric energy distribution is essential for creating the pressure gradient needed for liquid flow from the first to the second chamber.
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
Enables the preparation of brewed beverages using a conventional microwave oven by efficiently heating and pressurizing liquid to a desired temperature, ensuring effective delivery and utilization of energy, and is lightweight and compact without the need for additional heating elements.
Implementation Method 1
the liquid in the first chamber receives a first amount of microwave energy produced by a microwave oven
Implementation Method 2
When the liquid in the first chamber reaches its boiling point from receiving the first amount of microwave energy and at least partially turns into a gas
Implementation Method 3
at least a portion of the gas flows through the vapor flow path from the first chamber into the second chamber, thereby increasing a pressure in the second chamber
Implementation Method 4
The increased pressure in the second chamber forces at least a portion of the liquid in the second chamber through the liquid/vapor flow path from the second chamber to the destination outside of the second chamber
Data Source
Figure 1A
Figure 1B~1D
Figure 2A
AI summary
A device for delivering a liquid heated to a desired temperature under pressure in a microwave oven comprises a first chamber adapted to receive and hold a first volume of a liquid, a second chamber adapted to receive and hold a second volume of the liquid, a vapor flow path from the first chamber to the second chamber, and a liquid/vapor flow path from the second chamber to a destination outside of the second chamber. When the liquid in the first chamber reaches its boiling point and at least partially turns into a gas, at least a portion of the gas flows through the vapor flow path from the first chamber into the second chamber, thereby increasing a pressure in the second chamber. The increased pressure in the second chamber forces the liquid in the second chamber through the liquid/vapor flow path and out of the second chamber.