Shaft-Mounted Pump Sleeve Sealing for Faster Seal Service
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Solution Overview
Problem
The maintenance and service of rotary positive displacement pumps are time-consuming and difficult due to the need for periodic replacement of internal seals, requiring material handling equipment and extensive disassembly.
Innovation Solution
An improved sealing arrangement with a static seal between the rotor and sleeve and a dynamic seal between the sleeve and hub, allowing for easy access and replacement of wear components without disassembling the pump body from the gear case, reducing downtime for maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If traditional seal replacement procedures are used, then seals can be replaced, but pump disassembly is time-consuming and requires material handling equipment
Solution Approach 1:
The pump assembly is segmented into modular components with seals positioned in accessible locations. The sealing arrangement is divided into separate dynamic and static seal components that can be accessed independently, allowing technicians to replace seals without disassembling the entire pump assembly.
Solution Approach 2:
A seal carrier assembly acts as an intermediary component that holds the seals in an accessible position. This carrier can be removed and manipulated independently, bringing the seals within easy reach of technicians without requiring complex disassembly of the pump body.
2Ease of operation
If pump body is removed from gear case for maintenance, then seals are accessible, but maintenance complexity and time increase
Solution Approach 1:
The seals are pre-positioned on a removable carrier assembly that can be accessed before removing the pump body from the gear case. This preliminary positioning allows technicians to service the seals while the pump remains installed, avoiding the need for complex disassembly procedures.
Solution Approach 2:
The sealing system incorporates dynamic elements where the seal carrier can be independently removed and repositioned. This dynamic accessibility allows the seals to be reached through a simplified opening in the pump body without requiring removal of the entire pump assembly from the gear case.
3Ease of repair
If inlet and outlet lines are disconnected for service, then internal components are accessible, but service time and operational disruption increase
Solution Approach 1:
The seal carrier assembly is extracted as a separate, independently removable component from the pump body. This extraction allows technicians to access and service the seals without disconnecting the inlet and outlet lines, as the carrier can be removed through an opening that does not require line disconnection.
Data Source
AI summary
A rotary positive displacement pump comprising a pair of forwardly-positioned sealing arrangements and a pair of forwardly-positioned sleeves are received within a cavity providing for easy maintenance of the pump when the seals need to serviced. Each of the sealing arrangement includes a dynamic seal and a static seal. The dynamic seal abuts a corresponding sleeve and hub while a static seal is established between the corresponding sleeve and rotor.