Dual-Duct Ventilation for Printer Fusing UFP and Condensation Control
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Solution Overview
Problem
Existing image forming apparatuses face challenges in simultaneously reducing ultrafine particles (UFPs) and preventing dew condensation, as conventional exhaust systems struggle to manage the generation and discharge of wax vapors and water vapor effectively.
Innovation Solution
The apparatus incorporates a duct unit with dual fans and ventilation passages to control air flow, featuring a first fan for water vapor discharge and a second fan with a filter to manage UFPs, controlled by a circuit to optimize operations based on conveyance distance and temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a filter unit is added to exhaust air and reduce UFPs, then UFP reduction is achieved, but air flow resistance increases and exhaust efficiency decreases
Solution Approach 1:
The exhaust system is divided into two separate ducts: a first duct without a filter for high-volume heat and water vapor exhaust, and a second duct with a filter for UFP removal. This segmentation allows each duct to be optimized for its specific function, maintaining exhaust efficiency while achieving UFP reduction.
Solution Approach 2:
The first duct exhausts air excessively (without filtration) to ensure high-volume heat and moisture removal, while the second duct provides partial action (filtered exhaust) specifically for UFP control. This partial filtration approach maintains overall exhaust efficiency while addressing UFP emissions.
2Object-affected harmful factors
If air flow is increased to prevent dew condensation, then dew condensation prevention is achieved, but energy consumption increases
Solution Approach 1:
The ventilation system is segmented into two ducts with different fan configurations. The first duct uses a fan for high-volume air flow to prevent dew condensation, while the second duct uses a fan with lower power consumption for filtered UFP exhaust. This segmentation optimizes energy usage for each specific function.
Solution Approach 2:
The system changes operational parameters by controlling fans based on conveyance distance and temperature conditions. Fans are activated only when necessary (when conveyance distance exceeds a threshold or temperature indicates risk of condensation), reducing unnecessary energy consumption while maintaining dew condensation prevention.
3Reliability
If fans are operated continuously to maintain air flow, then dew condensation prevention and UFP removal are maintained, but power consumption increases
Solution Approach 1:
The fan operation is made dynamic rather than continuous. The control unit monitors conveyance distance and temperature in real-time, activating fans only when conditions require intervention (when recording material has moved beyond a threshold distance or when temperature indicates condensation risk). This dynamic control maintains reliability while minimizing energy consumption.
Solution Approach 2:
The system incorporates feedback mechanisms where the control unit continuously monitors conveyance distance and temperature conditions, and adjusts fan operation accordingly. This feedback-based control ensures fans operate only when necessary to prevent dew condensation and remove UFPs, optimizing the balance between reliability and energy consumption.
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 reduces UFP generation and prevents dew condensation on components, maintaining image quality and apparatus performance by balancing air flow and temperature management.
Implementation Method 1
a fixing unit that includes a first rotating member that is heated by a heating unit
Implementation Method 2
a filter that is provided in the second ventilation passage and removes fine particles
Implementation Method 3
a first duct fan that is provided in the first ventilation passage and generates an air flow from the first intake port toward the first exhaust port
Data Source
AI summary
There is provided an image forming apparatus including: a second duct unit including a second intake port that sucks air between a fixing unit and a transfer unit, a second exhaust port that exhausts air sucked from the second intake port to the outside, and a second duct that forms a second ventilation passage between the second intake port and the second exhaust port; a second duct fan that is provided in the second ventilation passage and generates an air flow from the second intake port toward the second exhaust port; a filter that is provided in the second ventilation passage and removes fine particles; and a control unit that controls operations of a first duct fan and the second duct fan, in which, in a case where a continuous job is started, the control unit starts the operation of the first duct fan when a conveyance distance of a recording material passing through a fixing nip portion reaches a first predetermined value.