Centrifugal Pump Case Body Deformation Prevention
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Solution Overview
Problem
Conventional cooling devices face issues with deformation of the centrifugal pump's case body when an annular seal member is used to prevent leakage between the pump and the radiator, leading to reduced thrust play and rotor impeller non-rotation due to the reaction force from the seal member.
Innovation Solution
The centrifugal pump is fixed to the radiator with an annular seal member between the bottom surface of the case body and the tank chamber, where the inner peripheral surface of the cylindrical portion overlaps the seal member, allowing it to absorb the reaction force and prevent deformation, maintaining thrust play and reducing the pump's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the centrifugal pump is fixed directly to the radiator with an annular seal member between the bottom portion of the case body and the radiator, then cooling medium leakage is prevented, but the bottom portion deforms toward the inside of the pump due to reaction force
Solution Approach 1:
A gasket is introduced as an intermediary element between the bottom portion of the case body and the radiator. The gasket absorbs the reaction force generated when the seal member is compressed, preventing this force from deforming the bottom portion while still maintaining the sealing function.
Solution Approach 2:
The harmful reaction force is extracted and isolated from the bottom portion by introducing the gasket as a separate component. The gasket specifically absorbs the reaction force, separating it from the bottom portion structure that needs to remain undeformed.
2Shape
If the bottom portion deforms toward the inside of the pump, then the shaft holding portion shifts, but the thrust play between the thrust bearing and rotor is eliminated causing non-rotation
Solution Approach 1:
The gasket serves as a mediator that absorbs the reaction force before it can reach the bottom portion and cause deformation. This protects the shaft holding portion from shifting and maintains the proper thrust play between the thrust bearing and rotor.
Solution Approach 2:
The gasket provides beforehand cushioning by absorbing the reaction force in advance, preventing the chain reaction that would lead to bottom portion deformation, shaft holding portion shifting, and loss of thrust play.
3Length of moving object
If the thickness of the centrifugal pump in the axial direction is reduced, then the protruding amount from the radiator is minimized, but the bottom portion becomes more susceptible to deformation
Solution Approach 1:
The gasket acts as an intermediary that compensates for the reduced strength of the thin bottom portion. By absorbing the reaction force, the gasket allows the bottom portion to be made thinner without risking deformation, thus minimizing the pump's protruding amount.
Solution Approach 2:
The sealing and force-absorption function is localized to the gasket, allowing the bottom portion to be optimized for minimal thickness. The local quality of the gasket provides the necessary strength and force absorption where needed, while the rest of the pump structure can be minimized.
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 configuration effectively suppresses deformation of the case body, minimizes thrust play reduction, and reduces the pump's protrusion from the radiator, while preventing cooling medium leakage and facilitating air discharge from the pump chamber.
Implementation Method 1
an annular seal member which prevents leakage of the cooling medium from a space between the centrifugal pump and the tank chamber is disposed between the bottom surface of the bottom portion and the side surface of the tank chamber
Implementation Method 2
the inner peripheral surface of the cylindrical portion connected to a surface of the bottom portion on the side in the second direction and the seal member overlap each other when seen in the axial direction of the rotation center shaft... at least a part of a reaction force of the seal member crushed between the bottom surface of the bottom portion of the case body and the side surface of the tank chamber can be received by the cylindrical portion
Implementation Method 3
a centrifugal pump which circulates the cooling medium between the cooling body and the radiator... an impeller fixed to the rotor and rotated by power of the motor
Implementation Method 4
a plurality of heat radiation fins connected to outer peripheral surfaces of the cooling pipes
Implementation Method 5
a plurality of heat radiation fins connected to outer peripheral surfaces of the cooling pipes
Data Source
AI summary
A cooling device having a centrifugal pump directly mounted on a radiator. An annular seal member is disposed between the bottom portion of the case body of the centrifugal pump and the side surface of the tank chamber of the radiator, and the annular seal member is used for preventing the cooling medium leakage via a space between the centrifugal pump and the tank chamber. The cylindrical portion of the case body and the annular seal member are overlapped with each other in the axial direction of the rotation center shaft of the motor that drives the centrifugal pump, in order that the cylindrical portion can receive at least a part of the reaction force of the annular seal member crushed between the case body and the tank chamber, and thereby the bottom portion of the case body of the centrifugal pump is prevented from deformation.