Volume Flow Controller Sliding Sleeve Assembly for Maintenance Access
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Solution Overview
Problem
Existing volume flow controllers in ventilation ducts are difficult to access for checking, adjusting, and cleaning after installation, as they become inaccessible or require significant effort to reach.
Innovation Solution
A volume flow controller arrangement featuring a sliding sleeve with a receiving section and an axially extending sliding section that allows the controller to be pushed into the sleeve, creating a gap for removal and access, with seals and an adjustment mechanism for easy maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the volume flow controller is installed directly in the ventilation duct pipe, then the installation is simple and compact, but the controller becomes inaccessible for checking, adjusting, and cleaning
Solution Approach 1:
The installation system is divided into three separate components: the ventilation duct pipe, the sliding sleeve (which remains fixed in the duct), and the volume flow controller (which is removable). This segmentation allows the controller to be accessed by removing it from the sliding sleeve without disturbing the duct installation, resolving the contradiction between simple installation and ease of access.
Solution Approach 2:
The sliding sleeve acts as an intermediary component between the ventilation duct pipe and the volume flow controller. It provides a receiving section that temporarily holds the controller during operation, then allows the controller to be extracted by sliding it out. This intermediary structure enables easy access to the controller while maintaining a compact installed appearance.
2Ease of repair
If the volume flow controller is made accessible after installation, then maintenance becomes easier, but the installation structure becomes more complex
Solution Approach 1:
The sliding sleeve incorporates a dynamic sliding mechanism that transitions between two states: a closed state where the receiving section holds the volume flow controller in place during normal operation, and an open state where the receiving section allows the controller to be removed. This dynamic structure provides easy maintenance access without requiring complex disassembly procedures.
Solution Approach 2:
The volume flow controller is nested within the receiving section of the sliding sleeve, which itself is nested within the ventilation duct pipe. This nested arrangement allows the controller to be accessed by sliding it out of the sleeve, providing easy maintenance while maintaining a compact overall structure when the controller is in place.
3Ease of repair
If the sliding section length is greater than the housing length, then the controller can be fully removed for maintenance, but the sliding sleeve occupies more space in the ventilation duct
Solution Approach 1:
The sliding section of the sliding sleeve extends beyond what is minimally required to hold the volume flow controller during operation. This excessive length provides additional clearance that allows the controller to be fully extracted from the sleeve for complete removal and maintenance. The extra space is only utilized during maintenance operations, while the sleeve maintains a compact appearance during normal operation.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
Volume flow controller arrangement with a volume flow controller (28) designed for installation in a ventilation duct, which has a tubular housing, a throttling element movably arranged in the housing and an adjustment device arranged on the outside of the housing for adjusting the throttling element, characterized by a sliding sleeve (22) which slidably receives the volume flow controller (28) in a receiving section (26) and has an axially adjoining sliding section (24) which is designed for slidable insertion into a pipe (14) of the ventilation duct, wherein the axial length (L1) of the sliding section (24) is greater than the axial length (L2) of the housing of the volume flow controller (28).