Pump Impeller Back Blades Suction Force Heat Management
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Solution Overview
Problem
In pump devices, the impeller is pressed toward the case body due to fluid pressure, leading to heat generation and potential deformation of resin components, which affects the rotor's stability and rotation accuracy.
Innovation Solution
The pump device incorporates a suction power generation mechanism with back blades on the impeller that draws fluid radially outward from the gap between the impeller and the end wall portion, reducing pressure and generating negative pressure to inhibit the impeller's movement toward the case body, while using metallic components to manage heat and maintain rotation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the impeller is pressed toward the case body by fluid pressure, then the impeller maintains contact with the case body for sealing, but heat is generated between the rotor and bearing member causing resin deformation
Solution Approach 1:
The suction force generation mechanism creates a negative pressure region between the impeller and end wall portion, generating a suction force that acts in the opposite direction to the fluid pressure. This counterbalances the pressing force, reducing the net force and consequently the heat generation between the rotor and bearing member while maintaining sufficient contact for sealing.
Solution Approach 2:
The back blades are designed to replicate the flow guidance function of the front blades but in the opposite direction. By creating a symmetric flow pattern, the suction force is generated to counterbalance the pressing force, reducing heat generation while maintaining sealing contact.
2Ease of manufacture
If resin components are used for the rotor and case body, then manufacturing complexity is reduced, but the components deform under generated heat affecting rotation accuracy
Solution Approach 1:
The suction force generation mechanism counterbalances the fluid pressure-induced pressing force, significantly reducing heat generation. This allows resin components to maintain their dimensional stability and rotation accuracy without requiring complex cooling systems or metallic materials, preserving ease of manufacture.
Solution Approach 2:
By changing the pressure distribution parameter through the suction force generation mechanism, the thermal environment of the resin components is improved. The negative pressure region reduces heat accumulation, allowing resin materials to operate within their thermal limits while maintaining manufacturing simplicity.
3Productivity
If the impeller rotates at high speed to increase productivity, then fluid circulation efficiency improves, but heat generation between rotor and bearing member increases causing deformation
Solution Approach 1:
The suction force generation mechanism creates a counterbalancing force that reduces the net pressing force between the rotor and bearing member. This allows the impeller to rotate at high speeds for improved productivity while the reduced contact pressure minimizes heat generation and prevents resin deformation.
4Reliability
If the gap between impeller and end wall portion is reduced to improve sealing, then sealing performance improves, but fluid flow resistance increases reducing productivity
Solution Approach 1:
The suction force generation mechanism utilizes fluid dynamics to create a negative pressure region that actively manages the pressure distribution in the gap. This allows for optimized gap dimensions that balance sealing performance and fluid flow efficiency, preventing excessive heat generation while maintaining both sealing and productivity.
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 prevents the impeller from being pressed toward the case body, reducing heat generation and maintaining rotor stability and rotation accuracy by utilizing back blades for suction and metallic components for heat management.
Implementation Method 1
a suction power generation mechanism configured to generate suction force moving the impeller toward the end wall portion when the impeller is driven by the motor
Implementation Method 2
pressure in the gap increases and a force moving the impeller toward the case body acts on the impeller... the suction power generation mechanism suctions the impeller toward the end wall portion
Data Source
AI summary
To provide a pump device configured such that the impeller can be prevented from being moved toward a case body by which a pump chamber is defined. An impeller is arranged in a pump chamber defined by a case body and an end wall portion of a motor. The impeller includes back blades protruding from a shroud toward the end wall portion of the motor. When the impeller is driven to circulate fluid through the pump chamber, a fluid is drawn out by the back blades from a clearance between the impeller and the end wall portion of the motor. Therefore, the impeller is moved by the negative pressure toward the end wall portion of the motor. The back blades function as a suction power generation mechanism configured to generate suction power sucking the impeller toward the end wall portion.