Screw housing and plug screw feeder
EP4727762A1Pending Publication Date: 2026-04-22VALMET AB
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Patent Information
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- VALMET AB
- Filing Date
- 2024-04-17
- Publication Date
- 2026-04-22
AI Technical Summary
Technical Problem
Existing plug screw feeders experience issues with uneven material distribution and wear due to material being pressed against the inner wall of the vessel, leading to decreased feeding abilities and potential problems like blow-back, co-rotation, and shearing.
Method used
A screw housing with a long anti-rotation bar along its inner surface, extending at least 75% of the length, positioned away from the inlet, helps distribute material uniformly and prevents co-rotation, thereby reducing uneven wear on the screw and vessel.
Benefits of technology
The solution enhances material distribution within the screw housing, reducing wear and extending the lifespan of the screw and vessel, thus saving costs by maintaining efficient operation.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure SE2024050371_26122024_PF_FP_ABST
Abstract
A screw housing 21; 21', a pug screw feeder 3 and a material transport arrangement for transporting biomass material in a system 100 for treatment of biomass material Said screw housing 21; 21' comprising a screw housing inlet 23 positioned in a side wall 21a of the screw housing 21; 21', whereby material is to be fed into the plug screw feeder 3 via the screw housing inlet 23, the screw housing inlet 23 being configured for connection to a feeding device 31 comprising a force-feeding screw. Wherein the screw housing 21; 21' comprises at least one long anti-rotation bar 51; 51' provided to an inner surface 22 of the screw housing 21; 21' and reaching along at least ¾ of a length, l2, of the screw housing 21; 21', wherein said at least one long anti-rotation bar 51; 51' is provided in a lengthwise section 56; 56' of the inner surface 22, wherein said lengthwise section 56; 56' is provided along the whole length, l2, of the screw housing 21; 21' and does not comprise the screw housing inlet 23.
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