Heating Device Grease Layer Friction and Heat Transfer
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Solution Overview
Problem
Existing image forming apparatuses face issues with increased sliding friction between the heating unit and the cylindrical drum, which can lead to deterioration and affect the efficiency of the fixing process.
Innovation Solution
A heating device with a cylindrical film and a heater, where a first grease layer with a consistency grade of three or less is used between the heater and the heat conductor, and a second grease layer with fluoro-grease is applied to the inner surface of the cylindrical film to reduce friction and improve heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heating unit abuts against a cylindrical drum in a fixing unit, then heat transfer is achieved for fixing toner, but sliding friction increases causing deterioration
Solution Approach 1:
A grease layer is introduced as an intermediary substance between the heating unit and the cylindrical drum. This grease layer serves dual purposes: it maintains thermal contact for heat transfer while simultaneously reducing sliding friction and preventing direct contact wear between the two surfaces.
Solution Approach 2:
The consistency grade of the grease is specifically controlled to be 3 or less. This parameter change ensures the grease remains sufficiently fluid to provide effective lubrication and reduce friction, while still maintaining adequate thermal conductivity for heat transfer functionality.
2Reliability
If grease is applied between heater and heat conductor, then sliding friction is reduced, but heat transfer efficiency may be affected
Solution Approach 1:
The consistency grade of the grease is precisely controlled to be 3 or less. This specific parameter adjustment optimizes the balance between lubrication performance and thermal conductivity, ensuring the grease is fluid enough to reduce friction effectively while maintaining sufficient heat transfer capability.
Solution Approach 2:
The grease application is localized to specific contact surfaces where friction occurs, while maintaining direct thermal contact in heat-critical areas. This selective application ensures friction reduction where needed without compromising overall heat transfer efficiency.
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 reduces sliding friction, enhances heat transfer, and maintains productivity by preventing overheating and abrasion, while simplifying the manufacturing process and reducing costs.
Implementation Method 1
A first grease layer is between the heat conductor and the second side of the heater and has a consistency grade less than or equal to three
Implementation Method 2
A first grease layer is between the heat conductor and the second side of the heater and has a consistency grade less than or equal to three
Implementation Method 3
a second grease layer with fluoro-grease is applied to the inner surface of the cylindrical film to reduce friction
Data Source
AI summary
A heating device includes a cylindrical film, a heater arranged inside the cylindrical film and extending along a longitudinal direction of the cylindrical film, a heat conductor extending along the longitudinal direction, and a first grease layer between the heater and the heat conductor and having a consistency grade less than or equal to three.