Gear Pump Shaft Concave Portion Dynamic Pressure
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Solution Overview
Problem
Frictional heat generated between the rotation shaft and the bearing portion in gear pumps can cause the quality of liquids, such as ink, to degrade, leading to foreign matter formation and reduced pump efficiency.
Innovation Solution
Incorporating concave or convex portions on either the rotation shaft or the bearing portion to create a dynamic pressure that separates the shaft and bearing, reducing frictional heat and preventing foreign matter formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotation shaft rotates in contact with the bearing portion, then the gear pump can operate and feed liquid, but frictional heat is generated causing liquid quality degradation and foreign matter formation
Solution Approach 1:
The patent introduces liquid as an intermediary medium between the rotation shaft and bearing portion. The liquid forms a pressure-generated film that separates the shaft and bearing surfaces, preventing direct contact and the associated frictional heating that would otherwise cure the liquid and create foreign matter.
Solution Approach 2:
The patent utilizes hydraulic pressure generated by the rotating shaft within the liquid medium to create a separating film. The rotation generates dynamic pressure in the liquid that pushes the shaft and bearing apart, maintaining a lubricating liquid layer that prevents thermal contact between the solid surfaces.
2Reliability
If the temperature of liquid increases due to frictional heat, then the liquid is cured and changed to foreign matter, but the rotation shaft and bearing portion continue to contact each other
Solution Approach 1:
The patent establishes a liquid cushioning layer between the rotation shaft and bearing portion before thermal contact can occur. This liquid film acts as a thermal and mechanical buffer, preventing the temperature rise that would lead to liquid curing and foreign matter formation while maintaining continuous operation.
3Device complexity
If foreign matter enters the portion between the rotation shaft and bearing portion, then rotation speed reduces or rotation stops, but the gear pump structure remains simple
Solution Approach 1:
The patent extracts the harmful contact friction mechanism from the system by introducing the liquid separation layer. By removing the direct solid-to-solid contact between shaft and bearing, the source of foreign matter generation is eliminated, preserving rotation speed without adding complex protective mechanisms.
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 dynamic pressure generated by the concave or convex portions effectively reduces frictional heat and prevents foreign matter formation, maintaining liquid quality and pump efficiency.
Implementation Method 1
When the rotation shaft rotates, at least either the concave portion or the convex portion causes a dynamic pressure to be generated in liquid in a portion between the rotation shaft and the bearing portion
Implementation Method 2
when the rotation shaft rotates in a state where the rotation shaft and the bearing portion are in contact with each other, frictional heat is generated between the rotation shaft and the bearing portion
Data Source
AI summary
To reduce frictional heat generated between a rotation shaft and a bearing portion in a gear pump in which the rotation shaft having a gear mounted thereon is received by the bearing portion and an image recording apparatus having the gear pump. Provided is a gear pump which has a rotation shaft, a bearing portion which receives the rotation shaft, and a gear which is mounted on the rotation shaft and rotates with the rotation shaft, in such a manner that the gear feeds liquid. Furthermore, at least either a concave portion or a convex portion is provided in at least either the rotation shaft or the bearing portion.