Centrifugal Rotary Machine Foreign Matter Removal Path
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Solution Overview
Problem
Foreign matter particles entering a centrifugal rotary machine can cause wear and damage by being ejected radially and lodging between the impeller and casing, leading to potential damage.
Innovation Solution
A centrifugal rotary machine design incorporating an impeller with a disk and blades, a cover, and a sealing device, along with a foreign matter introduction path and storage portion, which captures and removes foreign particles from the gap between the impeller and casing, utilizing a labyrinth seal and inclined paths to facilitate particle removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If foreign matter particles enter the gap between impeller and casing, then the machine can operate, but wear and damage occur on the inside surfaces
Solution Approach 1:
The patent extracts foreign matter particles from the harmful gap region by introducing a dedicated removal path. The foreign matter introduction path communicates with the radial flow path and extends toward the radial outer side, allowing particles to be extracted from the gap between impeller and casing and transported away from the harmful region.
Solution Approach 2:
The patent introduces an intermediary structure (foreign matter introduction path and storage portion) that mediates between the radial flow path where foreign matter is generated and the external environment. This intermediary path captures particles using the pressure difference created by impeller rotation and transports them to a storage portion, preventing direct contact with critical surfaces.
2Object-affected harmful factors
If a sealing device is added to seal the gap, then foreign matter removal is improved, but device complexity increases
Solution Approach 1:
The patent implements a self-service mechanism where the rotating impeller itself creates the pressure difference needed to drive foreign matter removal. The rotation of the impeller generates a pressure difference between the radial flow path and the foreign matter introduction path, automatically capturing and transporting particles without requiring external power sources or complex active control systems.
Solution Approach 2:
The patent utilizes pneumatic principles by employing pressure difference-driven flow to remove foreign matter. The pressure difference generated by impeller rotation creates a flow through the foreign matter introduction path, using gas dynamics to transport particles from the gap region to the storage portion without mechanical moving parts in the removal system.
3Object-affected harmful factors
If the foreign matter introduction path is made larger, then particle capture is improved, but the machine volume increases
Solution Approach 1:
The patent applies a nested structure where the foreign matter introduction path is integrated within the existing casing structure. The introduction path is formed inside the casing and communicates with the radial flow path, nesting the particle removal functionality within the existing machine volume rather than adding external structures.
Solution Approach 2:
The patent utilizes the radial dimension for particle transport. The foreign matter introduction path extends in the radial direction from the radial flow path toward the outer side, and the storage portion is positioned at the radial outer side. This radial arrangement allows efficient particle capture and storage without significantly increasing the axial or circumferential dimensions of the machine.
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
Effectively prevents foreign matter particles from lodging between the impeller and casing, reducing wear and damage by capturing and removing them through the foreign matter introduction and storage paths, ensuring smooth operation and extended machine lifespan.
Implementation Method 1
when the foreign matter particles come into contact with the rotating impeller, the foreign particles are ejected to the side outward from the impeller in a radial direction
Implementation Method 2
The sealing device seals the gap. The casing includes an end wall surface and a foreign matter introduction path
Implementation Method 3
The end wall surface is disposed to face one side in the axial direction of a cover end surface facing one side in the axial direction of the cover, extends in the radial direction and forms a radial flow path between the end wall surface and the cover end surface
Data Source
AI summary
This centrifugal rotary machine includes an impeller having a disk, blades, and a cover. The centrifugal rotary machine further includes a casing which accommodates the impeller radially inward and forms a gap between an outer circumferential surface of the cover and the casing. The centrifugal rotary machine further includes a sealing device which seals the gap. The casing includes an end wall surface which is disposed to face one axial side of a cover end surface facing one axial side of the cover, extends in the radial direction and forms a radial flow path between the end wall surface and the cover end surface. The casing further includes a foreign matter introduction path which is formed inside the casing and communicates with a radially outer side of the radial flow path.