Bayonet Fitting Sealing Ring for Pump Impeller Maintenance
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Solution Overview
Problem
Existing sealing ring units for pump impellers, particularly in multistage pumps, are difficult to replace during maintenance due to complex assembly and design, leading to inefficiencies in maintenance and potential leakage.
Innovation Solution
A sealing ring unit with a bayonet fitting mechanism allows for easy assembly and disassembly, featuring a sealing ring with a first and second portion and an annular back portion, mounted on a supporting member with radially extending projections and notches, enabling axial fitting and rotational locking for secure positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the sealing ring is made as a separate replaceable component, then the ease of repair is improved, but the device complexity increases due to the need for assembly and disassembly mechanisms
Solution Approach 1:
The sealing ring unit is divided into two main segments: the sealing ring itself and the supporting member. This segmentation allows the sealing ring to be replaced independently without replacing the entire unit, improving ease of repair while maintaining a relatively simple overall structure.
Solution Approach 2:
The bayonet fitting mechanism provides a dynamic assembly and disassembly system that transitions between locked and unlocked states. This dynamic feature enables easy replacement of the sealing ring through simple rotational movement, balancing ease of repair with minimal structural complexity.
2Volume of moving object
If the sealing ring unit is made compact, then the volume is reduced, but the ease of operation for maintenance decreases
Solution Approach 1:
The bayonet fitting mechanism utilizes rotational movement to achieve locking and unlocking, allowing compact dimensions while maintaining ease of operation. The rotational action provides mechanical advantage that enables simple maintenance operations within a compact axial length.
Solution Approach 2:
The bayonet fitting acts as an intermediary mechanism between the sealing ring and supporting member, enabling easy connection and disconnection despite the compact size. This intermediary mechanism translates simple rotational motion into secure mechanical engagement.
3Reliability
If the sealing ring is securely fixed to prevent leakage, then the reliability is improved, but the ease of repair deteriorates due to difficulty in removal
Solution Approach 1:
The bayonet fitting provides a dynamic locking mechanism that secures the sealing ring during operation through rotational engagement of protrusions with recesses, ensuring reliability. The same mechanism allows easy removal by reversing the rotational action, preventing the sealing ring from becoming permanently fixed.
Solution Approach 2:
The bayonet fitting replaces traditional threaded or welded mechanical connections with a simpler rotational locking system. This substitution maintains secure fixation for reliability while enabling tool-free removal for ease of repair.
Data Source
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AI summary
The invention relates to a sealing ring unit (1) for radially sealing the suction mouth (5) of a pump impeller (4), in particular for a multistage pump, the unit comprising a sealing ring (3) and a supporting member (2) removably carrying the sealing ring (3), the supporting member (2) having an annular inner portion (10) defining an opening (22) for receiving the suction mouth (5) of the impeller (4), the sealing ring (3) having a first portion (16) and second portion (17) and an annular back portion (15) to face the suction mouth (5) connecting the first and second portion (16, 17) with each other, the annular inner portion (10) being accommodated between the first and second portion (16, 17). According to the invention the sealing ring (3) being mountable on the supporting member (2) by means of a bayonet fitting (11, 17). Thus, an easy change of the sealing ring is enabled.