Pump Motor Casing Gas-Filled Gap Thermal Management
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Solution Overview
Problem
Conventional waste water pumps face issues with heat management, where the power supply component in the coupling compartment is not adequately cooled, leading to potential safety shutdowns due to excessive temperature, as the heat from the motor compartment overwhelms the coupling compartment, causing undesired heating rather than cooling.
Innovation Solution
The pump design incorporates a motor casing with an outer jacket and inner stator housing separated by a gas-filled gap, providing separate heat conducting paths from the motor and coupling compartments to the heat sink, ensuring effective cooling for the power supply component by maintaining distinct temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the coupling compartment is located on the opposite side of the motor compartment in relation to the heat sink, then the electrical equipment can be arranged separately, but the heat from the motor compartment overwhelms the coupling compartment causing undesired heating rather than cooling
Solution Approach 1:
The motor casing is divided into two separate compartments: a motor compartment for the electric motor and a coupling compartment for the power supply component. These compartments are thermally separated to allow independent temperature management, enabling the coupling compartment to be cooled separately from the motor compartment despite their adjacent arrangement.
Solution Approach 2:
A thermally insulating partition or barrier is introduced between the motor compartment and the coupling compartment. This intermediary structure prevents heat transfer from the hot motor compartment to the coupling compartment, allowing the coupling compartment to maintain lower temperatures even when positioned near the heat-generating motor.
2Reliability
If the power supply component requires dedicated cooling, then the component can operate reliably, but the heat from the motor prevents the coupling compartment from being cooled effectively by the heat sink
Solution Approach 1:
The cooling system is segmented into separate thermal zones. The coupling compartment is provided with its own dedicated cooling path to the heat sink, independent of the motor compartment's thermal management. This segmentation ensures that cooling resources are not competed for between the high-heat motor and the temperature-sensitive power supply component.
Solution Approach 2:
Different thermal management strategies are applied to different parts of the drive unit. The coupling compartment receives dedicated cooling attention with direct thermal pathways to the heat sink, while the motor compartment handles its own heat dissipation separately. This localized quality approach ensures each component receives appropriate thermal management for its specific requirements.
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 effectively manages heat distribution, preventing overheating of the power supply component and ensuring continuous operation by maintaining separate heat conducting paths from the motor and coupling compartments to the heat sink, thus avoiding safety shutdowns.
Implementation Method 1
a gas filled gap that in the radial direction separate the outer jacket and the inner stator housing
Data Source
AI summary
A pump for pumping liquid, the pump including a drive unit and a heat sink arranged to carry off heat that is generated in the drive unit, the drive unit including a motor compartment that in the radial direction is delimited by a motor casing and that accommodates an electric motor having a stator, a coupling compartment that at least partly is delimited by a pump top casing and that accommodates a power supply component, an upper partition that is arranged between the motor compartment and the coupling compartment. The motor casing includes an outer jacket that is connected to and that in the axial direction extends between the upper partition and the heat sink, an inner stator housing that extends between the stator and the heat sink, and a gas filled gap that in the radial direction separates the outer jacket and the inner stator housing.