Canned Motor Pump Stator Heat Dissipation
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Solution Overview
Problem
Canned motor pumps face inefficiencies in heat radiation due to the expansion and shrinkage of resin during the curing process, leading to gaps between the stator, stator can, and housing, which impede effective heat conductivity.
Innovation Solution
Filling the stator chamber with spherical inorganic material particles and a resin that bonds them, such as ceramic or glass beads with a suitable binder, to maintain adhesion and minimize volume change during temperature fluctuations, thereby enhancing heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If resin is filled in the stator chamber to improve heat radiation, then heat dissipation efficiency is improved, but gaps are formed between the stator, stator can, and housing due to resin expansion and shrinkage during curing, reducing adhesion and heat conductivity
Solution Approach 1:
The patent uses a composite filling material consisting of inorganic particles (such as ceramic particles, glass beads, or metal particles) dispersed in resin. This composite structure combines the adhesive properties of resin with the dimensional stability and thermal conductivity of inorganic particles, allowing the filling material to maintain good adhesion to stator components while resisting expansion and shrinkage during curing, thus preventing gaps and ensuring efficient heat dissipation
Solution Approach 2:
The patent modifies the physical and chemical parameters of the filling material by selecting inorganic particles with specific properties (high thermal conductivity, low thermal expansion coefficient, spherical shape) and optimizing their concentration and size distribution in the resin matrix. These parameter changes enable the filling material to achieve both good adhesion and minimal volume change during curing, resolving the contradiction between heat dissipation efficiency and adhesion reliability
2Temperature
If resin is filled in the stator chamber to improve heat radiation, then heat transfer is improved, but the resin expands and shrinks during curing causing spaces and insufficient heat conductivity improvement
Solution Approach 1:
The inorganic particles in the composite filling material provide dimensional stability during curing, compensating for the resin's expansion and shrinkage. This ensures that the filling material maintains consistent volume and density, eliminating gaps between the stator, stator can, and housing, and achieving both good adhesion and efficient heat transfer
Solution Approach 2:
By optimizing the particle concentration, size distribution, and shape of the inorganic particles in the resin matrix, the patent achieves high packing density and minimal void formation. The spherical shape of the particles facilitates dense packing, while their low thermal expansion coefficient ensures minimal volume change during curing, improving manufacturing precision and heat transfer efficiency
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 use of spherical inorganic material particles and resin improves adhesion within the stator chamber, ensuring efficient heat transfer and radiation without creating gaps, effectively reducing temperatures, particularly at the coil end by up to 50°C.
Implementation Method 1
resin with spherical inorganic material particles as a filler is filled in the stator chamber for installing the stator, and the resin is cured to thereby bond the spherical inorganic material particles to each other
Implementation Method 2
spherical material that has some extent of mechanical strength and is subjected to only a slight change in volume due to change in temperature when curing the resin
Data Source
Figure 1
Figure 2
AI summary
A canned motor pump, wherein a motor stator (26) is housed in a stator chamber (52) that is a space between a tubular stator can (38) for housing a motor rotor (24) and a tubular stator band (44) disposed coaxially with the stator can (38). The stator chamber (52) is closed by annular end plates (46, 48) at the cylindrical ends between the stator can (38) and the stator band (44). The stator chamber (52) is filled with a filler (66). The filler (66) is produced from spherical inorganic material particles filled into the stator chamber and resin for causing the particles to stick to each other. Consequently, the heat release performance of the stator of the canned motor pump is improved.