Motor Pump Cooling via Annular Channel and Bypass
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Solution Overview
Problem
Motor pump units with vertical axis wheels face cooling challenges, particularly when submerged, as the motor heats up and existing cooling methods are inadequate for effective heat dissipation.
Innovation Solution
A motor pump unit design featuring a vertical axis wheel with a discharge pipe connected to a bypass conduit that directs water into an annular channel, allowing for laminar flow and efficient cooling, with optional pressure-reducing diaphragm and strainer for improved flow and solid matter retention, and a cover to prevent splashing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the motor pump unit is submerged for operation, then the pump can function in water environments, but the motor heats up due to lack of submersion cooling at the top
Solution Approach 1:
An annular channel is introduced as an intermediary cooling path. Water from the discharge pipe is diverted through this channel to flow over the motor housing, serving as a mediator to transfer heat from the motor to the cooling water. This resolves the contradiction by enabling cooling without requiring the motor to be submerged.
Solution Approach 2:
The cooling system utilizes hydraulic principles by directing the pumped water through the annular channel. The water flow is controlled using a pressure-reducing diaphragm and strainer, applying hydraulic concepts to manage the cooling fluid's pressure and flow characteristics effectively.
2Temperature
If water is directed through the bypass conduit into the channel for cooling, then cooling effectiveness is improved, but water splashing and turbulent flow occur
Solution Approach 1:
A pressure-reducing diaphragm is installed in the bypass conduit to preliminarily reduce water pressure before it enters the annular channel. A strainer is also placed to filter debris in advance. This preliminary preparation of the water flow prevents turbulence and splashing during cooling, maintaining flow stability while preserving cooling effectiveness.
Solution Approach 2:
The system changes the pressure parameter of the cooling water by using a pressure-reducing diaphragm. By adjusting and reducing the water pressure to an optimal level before it enters the cooling channel, the system achieves stable laminar flow that prevents splashing while maintaining sufficient cooling capability.
3Temperature
If the channel is designed with spacers and a cover, then flow homogeneity and cooling efficiency are improved, but device complexity increases
Solution Approach 1:
The annular channel is segmented into functional zones using spacers and a cover. The spacers create a stable support structure, while the cover forms a contained flow path. This segmentation organizes the water flow into controlled segments, ensuring homogeneous flow distribution across the motor housing surface and improving cooling efficiency.
Solution Approach 2:
The cover serving the discharge pipe also functions as a support for the annular channel and provides structural enclosure for the cooling system. The spacers simultaneously provide structural support and define the flow channel geometry. This multi-functionality reduces the need for additional separate components, balancing complexity with performance.
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 design achieves homogeneous and effective cooling of the motor pump unit by utilizing laminar water flow through a carefully designed channel system, enhancing heat dissipation and preventing splashing, thereby maintaining unit efficiency.
Implementation Method 1
The flow is thus made very homogeneous and substantially laminar, which is excellent for good cooling of the body
Implementation Method 2
The water flows in the basin formed between the bottom of the channel and the upper face of the body until it comes into the gap and flows along the body, cooling it
Data Source
AI summary
Motor pump unit with vertical axis (XX') wheel, comprising a body (1), from which a discharge pipe (4) originates and whose upper part of the lateral surface is surrounded by a sleeve (13) at a distance providing an interval between them, characterized by: - an annular channel (8) supported by spacers (16) on the upper face of the body and delimited by a bottom (9), an inner face (10) at a distance from the axis (XX') and an outer face (11), the upper edge of the inner face being lower than the upper edge of the outer face and - a bypass conduit (5) putting the discharge pipe (4) into communication with the channel (8).