Heat Circulation Pump Terminal Box Thermal Isolation
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Solution Overview
Problem
Heating circulation pumps face challenges in reducing manufacturing and assembly costs while improving reliability, and existing designs suffer from thermal coupling issues between the motor housing and terminal box, leading to excessive heat transfer and potential damage from condensation.
Innovation Solution
The electric connection between the motor-side earthing contact and the plug or socket is arranged outside the terminal box, allowing heat to be directed away from the terminal box and reducing thermal loading on heat-sensitive components, with a branched earthing contact design that minimizes heat flow into the terminal box.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the earthing contact is arranged inside the terminal box, then the electrical connection is simplified, but thermal coupling between motor housing and terminal box increases causing excessive heat transfer
Solution Approach 1:
The earthing contact is segmented into two separate locations: one on the motor housing and another on the terminal box, connected by a lead that exits and re-enters the terminal box. This segmentation allows the electrical connection to be maintained while thermally isolating the terminal box from the motor housing heat.
Solution Approach 2:
The earthing lead acts as an intermediary element that provides the necessary electrical connection between the motor housing and terminal box while serving as a thermal barrier. The lead's path outside the terminal box allows heat to be directed away from the terminal box, reducing thermal loading on heat-sensitive components.
2Temperature
If the earthing lead is routed outside the terminal box, then thermal loading on heat-sensitive components is reduced, but the assembly process becomes more complex
Solution Approach 1:
The earthing lead is merged with the existing electrical leads that connect the terminal box to the motor. By combining the earthing function with the existing lead routing path, the design achieves thermal isolation without requiring a completely separate and complex assembly process.
Solution Approach 2:
The earthing lead utilizes its own routing path outside the terminal box to serve dual purposes: providing electrical connection and acting as a thermal management solution. The lead's external path naturally directs heat away from the terminal box, making the system self-regulating regarding thermal loads.
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 solution effectively reduces thermal loading on the terminal box, prevents damage from condensation, and simplifies assembly by allowing heat to be dissipated through the connection cable, while maintaining reliable electrical connections.
Implementation Method 1
the thermal coupling between the motor housing and the terminal box via the earthing which is inherent of the state of the art can be largely avoided, which is particularly advantageous if the motor housing is comparatively warm or comparatively cold compared to the terminal box
Data Source
AI summary
A heat circulation pump includes a pump housing (1) with a pump impeller driven by an electric motor. The electric motor is arranged in a motor housing (8) connected to the pump housing (1). A plastic terminal box (12) is fixed to the motor housing (8) and houses electric and/or electronic components of the engine control and electrically connects the motor, a ground contact arranged on the motor housing (8), and a plug or a socket (34) arranged on the outside of the terminal box (12). The ground contact arranged on the motor housing is connected in an electrically conductive manner to a ground contact of the plug or socket (34) and to at least one conductor inside the terminal box (12). The electric connection between the ground contact arranged on the motor housing (8) and the ground contact of the plug or socket (34) is arranged outside of the terminal box (12).