Overflow Chamber for Print Fluid Tank Pressure Management
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Solution Overview
Problem
Printing devices experience wastage of print fluid due to air expansion in storage tanks, leading to pressure changes that cause unintended leakage and drooling from nozzles, resulting in inefficiency and mess within the device.
Innovation Solution
Incorporating an overflow chamber positioned below the print head assembly and above the feeder tank, which allows print fluid to drain back into the feeder tank, maintaining negative backpressure and compensating for environmental changes, thereby reducing leakage and wastage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If storage tanks are used to store print fluid, then continuous operation is enabled, but air expansion causes pressure changes leading to leakage and drooling
Solution Approach 1:
An overflow chamber is introduced as an intermediary component between the storage tank and the print head assembly. This chamber receives excess print fluid through an overflow channel when pressure increases, preventing direct leakage from the print head. The intermediary chamber thus mediates the pressure fluctuations caused by air expansion while maintaining continuous operation capability.
Solution Approach 2:
The harmful effect of pressure buildup is extracted by separating the overflow function from the main fluid delivery path. The overflow channel extracts excess fluid before it can cause drooling at the print head, while the return channel extracts the extracted fluid and returns it to the storage tank, eliminating the harmful leakage while preserving continuous operation.
2Object-generated harmful factors
If overflow chamber is added to handle pressure changes, then leakage is reduced, but device complexity increases
Solution Approach 1:
The overflow chamber is merged with the storage tank structure, sharing common walls and integrated into the existing tank design. The overflow channel and return channel are integrated as internal passages within the combined structure, reducing the number of separate components and simplifying manufacturing while still providing leakage 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
The solution effectively minimizes print fluid wastage by maintaining a stable pressure environment, reducing drooling and leakage, and ensuring continuous operation of the printing device with reduced maintenance needs.
Implementation Method 1
the overflow chamber to receive print fluid from the feeder tank. The return path is to allow for print fluid in the overflow chamber to return to the feeder tank
Data Source
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AI summary
An example of an apparatus is provided. The apparatus includes a feeder tank to provide print fluid to a nozzle. The feeder tank is disposed below the nozzle to maintain a backpressure. The apparatus also includes a vent port to vent the feeder tank to atmosphere. The apparatus further includes an overflow chamber in fluidic communication with the feeder tank. The overflow chamber is disposed below the nozzle. In addition, the apparatus includes a return channel disposed on the overflow chamber to allow print fluid in the overflow chamber to return to the feeder tank.