Detachable Pump Shaft Hub for Easy Motor Separation
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Solution Overview
Problem
Existing pump coupling methods, such as the wedge-shaped press-fit and claw coupling, complicate maintenance and increase manufacturing costs, and hinder the separation of the pump from the motor, leading to unsatisfactory operability and potential degradation of pump performance.
Innovation Solution
A pump design featuring a tubular pump main shaft hub that is detachably attached to the pump main shaft, allowing for transition fitting with the motor main shaft and engagement with a pulley removing device for easy disassembly, reducing clearance and maintaining pump efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the pump main shaft is press-fitted into the motor main shaft in a wedge-shaped manner, then the coupling strength is improved, but the pump cannot be separated from the motor for maintenance
Solution Approach 1:
The coupling structure is divided into two separate coupling members: a pump side coupling member attached to the pump main shaft, and a motor side coupling member attached to the motor main shaft. This segmentation allows the pump and motor to be coupled strongly during operation while enabling easy separation for maintenance by simply detaching the coupling members.
2Ease of operation
If a claw coupling with elastic element is used to couple the pump main shaft to the motor main shaft, then the ease of separation is improved, but the manufacturing cost increases due to complicated shape
Solution Approach 1:
The coupling is segmented into two separate members with simple, standardized structures that can be manufactured independently using conventional processes. This avoids the need for complex claw-shaped couplings with elastic elements, reducing manufacturing cost while maintaining ease of assembly and disassembly.
Solution Approach 2:
The pump side coupling member is inserted into the motor side coupling member in a nested configuration. This nesting arrangement provides a compact, simple structure that is easy to manufacture and assemble, while still allowing for easy separation when needed.
3Reliability
If the pump main shaft is press-fitted into the motor main shaft, then the coupling reliability is improved, but the operability when separating pump from motor deteriorates
Solution Approach 1:
By dividing the coupling into two separate members that can be independently attached and detached, the system achieves reliable coupling during operation while maintaining excellent operability during separation. The segmented design allows the coupling to be as strong as press-fit connections during operation, yet as easy to separate as modular connections.
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
Provided is a pump that facilitates separation from a motor while curbing degradation of pump performance. A pump is provided. The pump includes: an impeller; a pump main shaft to which the impeller is attached; and a pump main shaft hub that is detachably attached to an end of the pump main shaft, and the pump main shaft hub is a tubular member, into which a motor main shaft is able to be inserted, which is configured to be coupled to the motor main shaft via transition fitting.