Water-Surface Propulsion Device With Integrated Refrigerant Suction
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Solution Overview
Problem
Conventional propulsion devices for water-surface movable bodies face challenges in cooling efficiency and lubrication performance due to the refrigerant suction port being separate from the turning portion, leading to inefficient refrigerant suction and a need for miniaturization.
Innovation Solution
The refrigerant suction port is integrated into the turning portion, with the deceleration mechanism and refrigerant supply mechanism arranged on the inner circumference, allowing efficient refrigerant suction and compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the refrigerant suction port is formed outside the turning portion, then the structure is simpler, but the cooling efficiency deteriorates when the turning portion turns significantly
Solution Approach 1:
The refrigerant suction port is integrated into the turning portion, merging two previously separate components into one unified structure. This ensures that the suction port moves with the turning portion, maintaining proper refrigerant intake positioning during rotation and improving cooling efficiency without requiring additional complex mechanisms.
2Ease of manufacture
If the refrigerant suction port is formed outside the turning portion, then the manufacturing is easier, but the lubrication performance deteriorates when the turning portion turns significantly
Solution Approach 1:
The lubricating medium suction port is integrated into the turning portion, ensuring it moves with the turning portion during rotation. This maintains proper positioning of the suction port relative to the lubricating medium, ensuring continuous and reliable lubrication performance without requiring separate complex suction mechanisms.
3Device complexity
If the deceleration mechanism and refrigerant supply mechanism are arranged separately, then the device complexity is lower, but the device volume increases
Solution Approach 1:
The deceleration mechanism and refrigerant supply mechanism are arranged on the inner circumference of the turning portion, utilizing the existing space within the turning portion structure. This nested arrangement allows both mechanisms to share the same spatial envelope, reducing the overall device volume without significantly increasing structural complexity.
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 enhances cooling efficiency and enables a more compact propulsion device by ensuring consistent refrigerant suction and reducing stirring resistance, facilitating easier maintenance.
Implementation Method 1
a first passage (P1) of the refrigerant is formed in the lower case, the first passage including a heat exchange portion (56) to exchange heat with the refrigerant
Data Source
AI summary
A propulsion device includes an upper case, a propulsion motor accommodated in the upper case, a lower case supported by the upper case so as to turn around a turning axis, a propulsor supported by the lower case and configured to rotate around a propulsion axis by a driving force of the propulsion motor, a deceleration mechanism provided on a driving force transmission path from the propulsion motor to the propulsor and configured to decelerate rotation of the propulsion motor, and a refrigerant supply mechanism configured to supply a refrigerant to the deceleration mechanism. The lower case includes a turning portion having a cylindrical shape centered on the turning axis, the deceleration mechanism and the refrigerant supply mechanism are arranged on an inner circumference of the turning portion, and a refrigerant suction port of the refrigerant supply mechanism is formed in the turning portion.