Pump Can Assembly With Flow-Formed Wall and Separate Flange
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Solution Overview
Problem
Existing methods for producing cans for magnetically coupled pumps face challenges in achieving high dimensional accuracy and ease of installation while maintaining a narrow gap between the driver and rotor, which affects efficiency and reliability.
Innovation Solution
A method involving deep drawing and flow forming to create a can part with a thin lateral wall and an interface for a separate flange part, allowing precise alignment and efficient force transmission without the need for additional machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the can wall thickness is reduced to minimize the gap between driver and rotor, then drive efficiency is improved, but manufacturing precision and reliability deteriorate
Solution Approach 1:
The can is divided into two separate parts: a can part and a flange part. The can part contains the lateral wall with the magnetically coupled pump components, while the flange part is attached separately. This segmentation allows the can part to have a thin lateral wall for efficiency while the flange part provides the necessary structural support and mounting interface, resolving the contradiction between thin wall thickness and manufacturing precision.
Solution Approach 2:
Different parts of the can have different wall thicknesses optimized for their specific functions. The lateral wall has a reduced wall thickness to minimize the air gap and improve drive efficiency, while the flange part has a greater wall thickness to provide structural integrity and precise mounting surfaces. This local differentiation allows each region to be optimized independently for its specific requirements.
2Loss of energy
If the can wall thickness is reduced to minimize the gap between driver and rotor, then drive efficiency is improved, but reliability deteriorates
Solution Approach 1:
By segmenting the can into a can part and a flange part, the thin-walled can part is protected by the structurally robust flange part. The flange part absorbs mechanical stresses and provides a stable mounting base, thereby enhancing the overall reliability of the assembly even though the can part has a reduced wall thickness for efficiency.
Solution Approach 2:
The can part and flange part are combined into a single assembled structure where the strengths of each component complement the other. The flange part provides structural support and reliability while the can part provides efficient magnetic coupling, creating a synergistic assembly that achieves both efficiency and reliability.
3Ease of manufacture
If the can is produced as a single-piece structure, then manufacturing is simplified, but dimensional accuracy and installation precision deteriorate
Solution Approach 1:
Dividing the can into separate can part and flange part allows each component to be manufactured independently with optimized processes. The can part can be produced with precise flow-forming for the lateral wall, while the flange part can be separately fabricated with precise mounting surfaces, and then assembled together to achieve high overall dimensional accuracy.
4Loss of energy
If the gap between driver and rotor is minimized for efficiency, then drive losses are reduced, but the can requires high dimensional accuracy and precise installation
Solution Approach 1:
The separation of the can part and flange part allows the flange part to serve as a precise mounting interface that can be independently positioned and aligned. This segmentation enables the can part to maintain its thin-walled efficient design while the flange part provides the necessary precision mounting surfaces and alignment features for accurate installation.
Solution Approach 2:
The flange part acts as an intermediary element between the can part and the pump housing. It provides standardized mounting interfaces and alignment features that facilitate precise installation of the can part, thereby enabling the thin-walled efficient design to be installed with the required precision without directly complicating the can manufacturing process.
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 method enables high dimensional accuracy and cost-effective production of cans with a narrow tolerance range, ensuring efficient operation and reliable installation in magnetically coupled pumps.
Implementation Method 1
a can part (10) and a flange part (20) are deep drawn
Implementation Method 2
a lateral wall (11) is flow formed and made into a target geometry with a defined wall thickness
Data Source
AI summary
A method for producing a can formed from a can part and a flange part is provided, the flange part being formed as an annular body and, on a side oriented inward toward an axis of symmetry of the annular body, an interface forming a bearing for the can part. A base and a lateral wall are formed on the can part, and the can part is deep drawn and made into a target geometry with a defined wall thickness by virtue of the lateral wall being flow formed. The lateral wall has a formed interface with a material thickness greater than the wall thickness of the lateral wall, and the flange part is connected to the can part at the interface.