Integrated Closing Valve Unit for Cyclone Maintenance
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Solution Overview
Problem
Centrifugal cleaning systems in paper and pulp mills face challenges with cyclone clogging, maintenance difficulties, and space constraints, leading to operational disruptions and safety risks during cyclone replacement or maintenance, especially when hundreds of cyclones are involved.
Innovation Solution
A combined closing valve unit is introduced, which integrates actuators and valves to facilitate simultaneous closure of feed and accept channels, reducing space requirements and minimizing operational disruptions, while allowing for easy mounting and replacement, using rotatable slide valves and push-in connections for efficient maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If individual closing valves are mounted between cyclones and channels, then maintenance operations can be performed without stopping the entire group, but space requirements increase and costs rise
Solution Approach 1:
The patent combines multiple closing valves (feed channel valve and accept channel valve) into a single integrated closing valve unit that can close both channels simultaneously with one actuator. This merging reduces the total number of separate valve components and actuators needed, thereby reducing space requirements while maintaining the capability to isolate individual cyclones for maintenance without stopping the entire group.
Solution Approach 2:
The closing valve unit is designed as a multi-functional component that performs multiple functions: closing the feed channel, closing the accept channel, and isolating the cyclone for maintenance. This universal design eliminates the need for separate valves for each function, reducing overall space consumption while enabling continuous operation of the centrifugal cleaner group.
2Ease of operation
If separate closing valves are used for feed and accept channels, then individual channel control is possible, but operational errors may occur and device complexity increases
Solution Approach 1:
The patent merges the control functions of feed channel closure and accept channel closure into a single actuator that operates both closing valves simultaneously. This eliminates the complexity of coordinating multiple separate actuators and reduces the risk of operational errors where one valve might be left open while another is closed. The single actuator provides precise, synchronized control of both channels.
3Ease of repair
If cyclones are detached without closing valves, then maintenance is simple, but the entire group must be stopped and contents may leak
Solution Approach 1:
The patent implements preliminary action by automatically closing both the feed channel valve and accept channel valve before the cyclone is detached from the group. This preliminary closure of channels prevents leakage of pressurized or hot contents and allows the cyclone to be safely removed for maintenance without stopping the entire centrifugal cleaner group. The closing action is integrated into the detachment sequence, ensuring channels are closed before the cyclone is disconnected.
4Adaptability or versatility
If closing valves are positioned in different directions, then installation flexibility is improved, but operating in wrong order becomes more likely
Solution Approach 1:
The patent combines the positioning and operation of feed channel closure and accept channel closure into a single integrated closing valve unit with one actuator. This eliminates the reliability issue of operating valves in wrong order by ensuring both channels are closed simultaneously through a single operational action. The integrated design maintains installation flexibility while guaranteeing correct operational sequence.
Data Source
Figure 1~2b
Figure 3a~3b
Figure 4
AI summary
A closing valve unit (9) for a centrifugal cleaner arrangement (1), said unit (9) being connectable by means of connecting members (14, 15) between a feed conduit (3) of a centrifugal cleaner group (1) and a feed conduit of the cyclone (2) and between an accept channel (4) of the centrifugal cleaner group (1) and an accept conduit of the cyclone (2). The closing valve unit (9) comprises closing members for closing both the feed flow and the accept flow.