Semi-Submerged Vertical Pump Motor Cooling and Protection
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Solution Overview
Problem
Existing pumping devices with a semi-submerged vertical drive axis are prone to premature failure due to flooding and damage from rising liquid levels, particularly in refrigeration systems, as the motor assembly is not adequately protected from water ingress, leading to bearing and coil damage.
Innovation Solution
A device with a motor assembly protected by a closed containing structure, where the ventilation unit is positioned between the motor assembly and the liquid, ensuring the motor remains dry and cool through indirect heat exchange with external cooling air, while maintaining the motor assembly's bulk and functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the motor assembly is positioned close to the liquid for compact design, then the device complexity is reduced, but the motor assembly becomes vulnerable to water ingress and liquid damage
Solution Approach 1:
The motor assembly is segmented from the liquid environment by introducing a protective enclosure that separates the motor components from the cooling liquid, allowing the motor to be positioned close to the liquid for compactness while maintaining protection through spatial segmentation
Solution Approach 2:
A protective enclosure acts as an intermediary barrier between the motor assembly and the cooling liquid, enabling the motor to operate close to the liquid without direct contact, thus resolving the contradiction between compact positioning and protection from water ingress
2Temperature
If the ventilation unit is positioned to allow direct air cooling of the motor, then the cooling efficiency is improved, but the motor assembly becomes exposed to liquid infiltration through the ventilation pathways
Solution Approach 1:
The protective enclosure serves as an intermediary that allows ventilation air to cool the motor while blocking liquid infiltration, enabling direct air cooling without exposing the motor to liquid damage through the ventilation pathways
Solution Approach 2:
The protective enclosure acts as a flexible barrier that permits thermal exchange between the ventilation air and motor while preventing liquid penetration, resolving the contradiction between cooling efficiency and liquid protection
3Reliability
If the motor assembly is positioned higher to prevent liquid contact, then the reliability is improved, but the device height and installation space requirements increase
Solution Approach 1:
The protective enclosure segments the motor assembly from the liquid environment, allowing the motor to be positioned at an optimal height for compact installation while maintaining protection, thus resolving the contradiction between reliability and device height
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 prolongs the operational life of the pumping device by preventing water contact with sensitive components, even during uncontrolled liquid level rises, ensuring safe and reliable operation.
Implementation Method 1
the ventilation unit is positioned between the motor assembly and the liquid, ensuring the motor remains dry and cool through indirect heat exchange with external cooling air
Data Source
Figure 1~2
Figure 3
Figure 4~4a
AI summary
A device (10, 110) for moving a liquid (11) comprises, disposed along a common axis (Y), a motor assembly (18), a ventilation unit (33) for cooling the motor assembly (18), movement means (21, 23), kinematically connected to the motor assembly (18), which movement means (21, 23) are able to be at least partly submerged in the liquid (11) and can be driven by the motor assembly (18) for moving the liquid (11). The ventilation unit (33) is disposed along the axis (Y), between the motor assembly (18) and the movement means (21, 23), so as to distance, during normal use, the motor assembly (18) from the liquid (11).