AC Permanent-Magnet Drain Pump Integrated Stator Rotor Housing
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Solution Overview
Problem
Conventional U-shaped alternating-current permanent magnet draining pumps face challenges with low electromagnetic efficiency due to increased magnetic air gaps, noise, vibration, and poor heat dissipation, which also result in larger sizes and higher manufacturing costs.
Innovation Solution
The design reduces the magnetic air gap between the stator core and rotor by integrating the concave arc portion of the stator core into the rotor housing, using two-shot injection molding for simplified structure and reduced size, and incorporates a water cooling chamber for enhanced heat dissipation, while employing a stainless steel rotor cylinder to minimize component distances and prevent vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rotor cylinder is used to separate the stator core and rotor magnetic core, then the structural strength is improved, but the magnetic air gap is increased and electromagnetic efficiency is reduced
Solution Approach 1:
The invention removes the rotor cylinder component entirely from the pump structure. Instead of using a separate rotor cylinder to support the rotor assembly, the pump body itself is designed to directly support the rotor assembly, eliminating the unnecessary component that was causing the increased air gap and energy loss.
Solution Approach 2:
The invention merges the functions of the pump body and rotor cylinder into a single integrated structure. The pump body is designed to simultaneously provide structural support and serve as the mounting structure for the rotor assembly, eliminating the need for a separate rotor cylinder component.
2Ease of manufacture
If the stator core is sleeved on the outer wall of the rotor housing, then the assembly is simplified, but the distance between stator core and magnetic core is increased and magnetic resistance is increased
Solution Approach 1:
The invention removes the rotor housing component that was being sleeved with the stator core. The pump body is redesigned to directly accommodate both the stator core and rotor assembly, eliminating the intermediate rotor housing that was creating excessive distance and magnetic resistance.
3Ease of manufacture
If conventional injection molding is used to form the coil package, then the manufacturing process is simplified, but the heat dissipation performance is poor
Solution Approach 1:
The invention introduces a water cooling system where the pump body contains water channels that flow around the motor components. This hydraulic cooling method efficiently removes heat from the coils and motor assembly while maintaining the simplified injection molding manufacturing process for the pump body.
4Manufacturing precision
If gaps are maintained between stator core, coil package and pump body, then the assembly tolerance is improved, but vibration and noise are increased
Solution Approach 1:
The invention merges the stator core, coil package, and pump body into a more integrated assembly with minimized gaps. The pump body is designed to directly surround and support these components, reducing the gaps that cause vibration and noise while maintaining adequate assembly tolerance through precision molding.
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 approach improves electromagnetic efficiency, reduces noise and vibration, lowers manufacturing costs, and extends the pump's operational life by minimizing component distances and facilitating effective heat dissipation.
Implementation Method 1
heat dissipated by the stator core 8' is thermally conducted only by radiation and to the rotor housing of the pump body 10'
Implementation Method 2
incorporates a water cooling chamber for enhanced heat dissipation
Implementation Method 3
improves electromagnetic efficiency
Data Source
Figure 1~1a
Figure 1b~2
Figure 3~3a
AI summary
The present invention discloses an alternating-current permanent magnet draining pump, including a pump cover, a pump body, a magnetic core, a rotating shaft, a stator core and coils. The coils are wound around a coil former, and the stator core is assembled to the coils. The pump body is a shell formed by surrounding a contour of the coils, the coil former, and the stator core which have been assembled to perform a integrated injection molding. The shell defines a magnetic core accommodating space which is used for accommodating the magnetic core and has an opening at a top portion and the magnetic core accommodating space extends from the opening to a center of the pump body. A supporting member is arranged in the opening at the top portion of the magnetic core accommodating space for supporting a bearing of the rotating shaft. The pump body includes a first pump body portion and a second pump body portion. The second pump body portion is provided therein with a cylinder-shaped rotor housing for supporting the rotor assembly, and the magnetic core accommodating space is surrounded and formed by an inner surface of the rotor housing; and a concave arc portion of the stator core is embedded in the rotor housing. The present invention may reduce the magnetic air gap between the stator core and the rotor, improve the operation efficiency of the product, reduce the overall size of the pump body, lower the manufacturing cost of the product, avid resonance and noise generated by the pump body and improve the heat dissipation performance of the pump.