Centrifugal Pump Cover Layout for Heat Transfer and Temperature Control
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Solution Overview
Problem
Conventional heaters for household appliances, such as centrifugal pumps, suffer from inefficiencies in heat transfer and reliability due to the interposition of a metal cover between the heating resistor and the water, leading to suboptimal heat exchange and potential issues with dirt accumulation and sensor sensitivity.
Innovation Solution
A cover design for centrifugal pumps where the electric resistor is fixed to the cover with a heating stretch in contact with the liquid and a portion spaced apart, allowing direct contact and improved heat exchange, while also enabling enhanced sensitivity of safety and control devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the metal cover is interposed between the resistor and water to provide safety control, then the safety and control functions are improved, but the heat exchange efficiency deteriorates
Solution Approach 1:
The heating element is segmented into multiple heating zones (first heating zone, second heating zone, third heating zone) with different configurations relative to the cover. Some zones have the resistor in direct contact with water while others have the cover interposed, allowing simultaneous optimization of heat transfer efficiency and safety control in different regions
Solution Approach 2:
Different portions of the heating element have different structural characteristics: the first heating zone has the resistor directly contacting water for maximum heat transfer, while the second and third heating zones have the cover interposed for safety control and thermostat mounting, respectively. This local differentiation resolves the contradiction between heat efficiency and safety
2Loss of energy
If the resistor is in direct contact with water to improve heat exchange, then the heat transfer efficiency is improved, but the risk of dirt accumulation and limestone deposition increases
Solution Approach 1:
The heating element is divided into multiple zones with different contact configurations. The first heating zone allows direct contact for efficient heat transfer, while the second heating zone has the cover interposed to prevent dirt accumulation, distributing the functional requirements across different segments
Solution Approach 2:
The metal cover serves as an intermediary element between the resistor and water in certain heating zones. It enables thermal contact for safety control while its smooth surface prevents dirt and limestone accumulation, mediating between the conflicting requirements of heat transfer and contamination prevention
3Measurement precision
If the thermostat is placed on the cover away from the heating element to improve temperature sensing accuracy, then the temperature control precision is improved, but the device complexity increases
Solution Approach 1:
The metal cover serves multiple functions simultaneously: it provides structural closure, enables safety control through thermal contact with the heating element, prevents dirt accumulation, and serves as the mounting base for the thermostat. This multi-functionality eliminates the need for separate components, reducing overall device complexity while maintaining temperature sensing accuracy
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 design optimizes heat exchange, improves the reliability of the resistor, reduces limestone accumulation, and allows for precise temperature control with less complex and affordable thermostats, enhancing the overall efficiency and sensitivity of the heating system.
Implementation Method 1
an electric resistor, or electric heater, for heating the liquid
Implementation Method 2
at least one first portion of the heating stretch is in contact with the inner face, and wherein said at least one first portion is welded or brazed to the inner face
Implementation Method 3
at least one second portion of the heating stretch is spaced apart from the inner face... substantially all the surface of such spaced apart portion can be lapped by the fluid and therefore can exchange heat with the fluid
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A cover (1 ) for centrifugal pump comprising a heating element (8) which has a heating stretch (10) and two end stretches (12) connected to the heating stretch (1 0), in which the heating element (8) crosses the cover (1 ) so that the heating stretch (10) is below the cover (1 ) and the two end stretches (12) are above the cover (1 ), and wherein at least one first portion (14) of the heating stretch (10) is in contact with the cover (1 ), and wherein at least one second portion (16) of the heating stretch (10) is spaced apart from the inner face (4).