Impeller Labyrinth Sealing for Pulping Mixing Quality
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Solution Overview
Problem
Existing pulping devices suffer from poor mixing quality due to excessive clearance between the mixing impeller assembly and the housing, allowing liquid to bypass mixing and be discharged without participating in the pulp formation.
Innovation Solution
The pulping device incorporates an annular protrusion and matching groove on the impeller assembly and housing to create a labyrinthine sealing structure, redirecting liquid to participate in powder mixing, thereby improving mixing efficiency and ensuring better pulp quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a large clearance is maintained between the impeller assembly and housing, then the impeller can rotate freely without interference, but liquid flows through the clearance and is discharged without mixing with powder, deteriorating mixing quality
Solution Approach 1:
A sealing structure comprising an annular protrusion and an annular groove is introduced as an intermediary element between the impeller assembly and housing. The protrusion extends from the housing end surface toward the impeller, while the groove is formed on the impeller bottom surface, creating a sealing interface that prevents liquid from bypassing the mixing zone through the clearance without compromising impeller rotation freedom
Solution Approach 2:
The sealing solution transitions from a simple radial clearance control to a three-dimensional labyrinthine sealing structure. The annular protrusion and groove create a multi-level sealing path that liquid must navigate, adding a vertical dimension to the sealing mechanism while maintaining the necessary radial clearance for impeller operation
2Manufacturing precision
If the clearance between impeller assembly and housing is reduced, then liquid bypass flow is prevented, but the impeller may interfere with the housing, affecting rotation
Solution Approach 1:
The sealing structure acts as an intermediary that allows the impeller to maintain a relatively large clearance from the housing while still preventing liquid bypass. The annular protrusion and groove create a sealing interface that blocks liquid flow paths without requiring the impeller to be in close proximity to the housing, thus avoiding interference
Solution Approach 2:
The clearance space between impeller and housing is segmented by the annular protrusion and groove into multiple regions. This segmentation creates a labyrinthine path that liquid must follow, effectively blocking direct bypass flow while maintaining the overall clearance necessary for impeller rotation freedom
Data Source
AI summary
Provided is a pulping device. The pulping device includes a housing, a drive shaft, and an impeller assembly. The housing defines a cavity. The impeller assembly is disposed in the cavity and is configured to be driven to rotate by the drive shaft. A bottom surface of the impeller assembly is disposed opposite to an end surface of the housing, and one of the bottom surface of the impeller assembly or the end surface of the housing is provided with an annular protrusion, and the other one of the bottom surface of the impeller assembly or the end surface of the housing defines an annular groove matching the annular protrusion, and an interference-proof clearance is defined between an outer wall of the annular protrusion and an inner wall of the annular groove.