Centrifugal Pump Bottom Plate Aeration Path for Condensation Control
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Solution Overview
Problem
Existing multi-functional closure bottom plates for centrifugal electric pumps are costly to produce and inefficient in preventing water condensation inside the pump body due to non-homogeneous air circulation, which can damage electromechanical components.
Innovation Solution
A bottom plate design featuring a motor cover and connector-holder cover with an internal aeration path that utilizes natural convection to circulate heated air, preventing condensation through a labyrinthine structure that prevents liquid entry while allowing efficient air circulation across the entire volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a double bottom with inner cavity is used to evacuate hot air by convection, then condensation prevention is improved, but production cost increases due to ultrasonic welding or gluing operations
Solution Approach 1:
The bottom plate is divided into an outer bottom plate and an inner bottom plate as separate components. The inner bottom plate is inserted into the outer bottom plate to form a cavity, eliminating the need for complex welding or gluing operations while maintaining the condensation prevention function through natural convection of hot air.
Solution Approach 2:
The complex welding or gluing process is extracted and replaced by a simple insertion mechanism. The inner bottom plate is taken as a separate insertable component rather than being permanently bonded, significantly simplifying the manufacturing process and reducing production costs.
2Reliability
If a double bottom with inner cavity is used for air circulation, then condensation prevention is improved, but manufacturing precision requirements increase due to accurate welding or gluing
Solution Approach 1:
The bottom plate structure is segmented into two separate plates that fit together through insertion rather than requiring precise bonding. This segmentation transforms a high-precision bonding operation into a simpler mechanical fit, dramatically reducing manufacturing precision requirements.
Solution Approach 2:
The complex bonding operation is extracted and replaced by a simple insertion mechanism. The inner bottom plate is designed to fit into the outer bottom plate without requiring precise welding or gluing, making the manufacturing process more tolerant and easier to control.
3Speed
If air circulation path is concentrated near recirculation holes, then local air circulation is improved, but homogeneity of air circulation across the entire volume deteriorates
Solution Approach 1:
The air circulation system is designed with different qualities in different locations. The inner bottom plate creates a cavity that allows hot air to rise and circulate throughout the entire volume, while recirculation holes are strategically positioned to ensure uniform distribution. This local optimization ensures both high circulation speed and homogeneity across the entire space.
Solution Approach 2:
The air circulation is enhanced by adding a vertical dimension through the cavity formed by the inner and outer bottom plates. Hot air rises vertically through the cavity and distributes horizontally through recirculation holes, creating a three-dimensional circulation pattern that ensures homogeneous air distribution across the entire volume rather than concentrating flow in a single plane.
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 prevents condensation throughout the pump's internal volume, reducing the risk of damage to electrical and electronic components while maintaining a low production cost and ensuring efficient air circulation.
Implementation Method 1
an internal aeration path (4), which allows, by natural convection, the circulation of the air heated during the operation of the electric pump
Data Source
AI summary
A closure bottom plate 1 for electric pump 100, in particular for a boiler circulation centrifugal pump, is made of a cup-shaped motor cover 2 and a connector-holder cover 3. The bottom plate 1 has an internal aeration path 4, intended to allow the circulation—by natural convection—of air which is heated during the operation of the electric pump 100 preventing the formation of condensate inside the bottom plate 1. The internal aeration path 4 is extended between at least one inlet opening 22 arranged on the motor cover 2 and an outlet opening 36, successively crossing the internal volume of the motor cover 2, the coupling opening 21, and a labyrinth 32 defined by the connector-holder cover 3.