Liquid Circulation Heater Shutdown for Ink No-Flow Overheating
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Solution Overview
Problem
Liquid circulation devices face overheating issues when ink is not circulating, leading to potential thermal fuse activation or heater breakdown, and alterations in ink characteristics due to abrupt temperature rises.
Innovation Solution
A liquid circulation device with a controller that monitors the temperature of both the heater and the ink, using temperature sensors to control the heater's energization and prevent overheating by turning it off when a predetermined temperature rise threshold is exceeded, ensuring the ink temperature remains within a suitable range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heating control is performed when ink is not circulating, then the ink temperature can be maintained within the suitable temperature range, but the heater temperature rises abruptly causing overheating and potential damage
Solution Approach 1:
The system uses temperature sensors to continuously monitor both the ink temperature and heater temperature, creating a feedback loop that allows the controller to detect when ink circulation stops and adjust heating control accordingly, preventing heater overheating while maintaining ink temperature
Solution Approach 2:
The heating control system dynamically adjusts its operation based on real-time conditions - when ink is circulating, normal heating control is applied; when ink circulation stops, the system detects this change and modifies heating control to prevent heater temperature from rising above safe limits
2Temperature
If heating control is performed when ink is not circulating, then the ink temperature can be maintained, but the ink characteristics are altered due to abrupt temperature rise
Solution Approach 1:
The temperature sensor monitoring ink temperature provides feedback to the controller, which detects when ink circulation stops and adjusts heating control to prevent abrupt temperature changes that would alter ink characteristics, maintaining both temperature control and ink stability
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
Prevents overheating, avoids thermal fuse activation, and maintains ink quality by controlling the heater's operation based on real-time temperature measurements, thus ensuring reliable operation and high-quality printing.
Implementation Method 1
a heater configured to heat the liquid circulating in the pipeline
Implementation Method 2
a first temperature sensor configured to measure a temperature of the heater
Implementation Method 3
a second temperature sensor configured to measure a temperature of the liquid circulating in the pipeline
Data Source
AI summary
A liquid circulation device includes a liquid chamber that stores a liquid that is to be supplied to a liquid discharge head. A pipeline through which the liquid can be circulated between the liquid chamber and the liquid discharge head is provided. A heater heats the liquid circulating in the pipeline. A first temperature sensor measures the temperature of the heater, and a second temperature sensor measures the temperature of the liquid in the pipeline. A controller controls the heating of the heater based on the liquid temperature measured by the second temperature sensor. The controller also monitors a change in the measured temperature of the heater over time and turns off the heating of the heater when the monitored change satisfies a predetermined stop condition.