Shaft Seal Protection in Circulating Dispersers
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Solution Overview
Problem
Existing systems for dispersing slurry or liquid mixtures using rotating and continuously dispersing devices face challenges with mechanical seals, including complexity, high cost, and potential damage from particulates, leading to increased maintenance and costs.
Innovation Solution
A system and method that maintains the mixture level in the dispersing device such that the shaft seal is not immersed, using a circulating pump and piping to ensure the outflow exceeds the inflow, preventing mixture penetration and simplifying the shaft seal structure, thereby reducing maintenance and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical seal is used to prevent leakage of high concentration slurry, then sealing reliability is improved, but device complexity and cost increase
Solution Approach 1:
The invention extracts the harmful mixture from the seal area by controlling the liquid level to remain below the shaft seal position. This prevents the mixture from contacting the mechanical seal, allowing the use of simpler seal structures without compromising sealing reliability for high concentration slurry dispersing operations
2Reliability
If a mechanical seal is used to prevent leakage, then sealing performance is improved, but maintenance frequency increases due to particulate damage
Solution Approach 1:
The invention applies preliminary anti-action by maintaining the liquid level below the shaft seal position before any damage can occur. This preventive approach stops particulates from reaching the mechanical seal, thereby preventing seal surface damage and extending seal lifespan without sacrificing sealing performance
3Duration of action of stationary object
If a double mechanical seal is used to prevent particulate damage, then seal durability is improved, but cost and structure complexity increase significantly
Solution Approach 1:
The invention removes the mixture from the seal area by controlling liquid level, which eliminates the need for complex double mechanical seal arrangements. This approach achieves seal durability by prevention rather than redundancy, significantly reducing structure complexity while maintaining durability
4Productivity
If mixture level is maintained above shaft seal for continuous operation, then productivity is improved, but seal damage and maintenance increase
Solution Approach 1:
The invention introduces the liquid level position as an intermediary control parameter between the mixture and the shaft seal. By maintaining the liquid level below the seal position, it creates a protective boundary that allows continuous high-productivity operation while preventing particulate damage to the seal
Data Source
AI summary
A system and a method for dispersing by circulating a mixture that simplifies the structure of the part for sealing a shaft of a dispersing device and lengthens the life of the device are provided. The system for dispersing by circulating a slurry or liquid mixture to disperse substances in the mixture comprises a rotating and continuously dispersing device that disperses the mixture, a tank that is connected to an outlet of the dispersing device, a circulating pump that circulates the mixture, and a piping that in series connects the dispersing device, the tank, and the circulating pump. In the dispersing device the outflow of the mixture is greater than the inflow so that an amount of the mixture in the dispersing device is maintained at a level where a part for sealing a shaft that is provided inside the dispersing device is not immersed.