Press release [PDF; 45 KB]
Press release [RTF; 1222 KB]
MAHLE star-pleated dust filter cartridges are used to separate ultrafine particles from the air. Dust-laden air passes through the fixed, upright filter cartridge, flowing from the outside to the inside, and escapes through the open end cap at the top. Efforts to optimize the filter cartridge for improved flow and rigidity have resulted in a conical cartridge design. With the exceptionally quiet MAHLE multi-jet nozzle, filter cartridges can be cleaned much more efficiently than with conventional nozzles.
A superior cleaning performance compared to cylindrical filter cartridges and more efficient flow ratios result in up to 30% greater capacity in dust collectors.
Advantages of conical dust filter cartridges in a sample sandblasting application (volume flow 1,200 m³/h, housing diameter 530 mm):
Cartridge shape | Unit | Conical | Cylindrical |
Cartridge diameter | mm | 120 | 120 |
Connection | | RD 72 | RD 72 |
Filter surface/cartridge | m² | 1.6 | 1.6 |
Total filter surface | m² | 12.8 | 12.8 |
Filter surface loading | m/min | 1.56 | 1.56 |
Free surface between bottom end caps | % | 82 % | 59 % |
Upstream flow rate between bottom end caps | m/s | 1.84 | 2.56 |
Rate of escape from top end cap (round-thread connection) | m/s | 7.15 | 7.15 |
Volume of cartridge (clean side) | l | 3.23 | 6.08 |
These data demonstrate the following advantages of conical filter cartridges over cylindrical cartridges:
Up to 30% higher volume flows/performance density owing to optimal flow ratios
More compact filter units as a result
Better efficient cleaning (less interior volume compared to cylindrical cartridge)
Superior dust sedimentation (smaller area of bottom end caps)
Higher differential pressure stability
Regular flow rate over the whole length
Flow profile on dirt side
The conical cartridge shape results in a greatly reduced upward flow rate near the bottom end caps. This enhances the cleaning performance, especially for light dusts, as it allows for better dust sedimentation.
Effects in sample application involving paper-dust extraction
After 1,170 hours of operation, cylindrical filter cartridges are inadequately cleaned, particularly near the bottom end caps. After retrofitting the filters with conical cartridges, these are still clean from top to bottom after 4,600 hours of operation.
Technical data:
Regular, extensive material and performance tests are the key to ensuring the consistently high quality of MAHLE dust filter cartridges. In our application engineering department and state-of-the-art development laboratories, we continuously strive to improve and optimize our products. Application tests conducted on-site at our customers' locations and in our own test facilities form the basis for cost-effective, reliable products.
MAHLE Industriefiltration has been producing high-quality industrial filters for fluid technology, air filtration, and process technology for many years. As an innovative, reliable development partner and supplier all over the world, MAHLE Industriefiltration is your expert partner in all areas of filtration and separation. MAHLE Industriefiltration is an independent service area with its own engineering, production, and sales team, integrated in the MAHLE Group, and thus is backed by the strength of a worldwide market leader. The MAHLE Group is among the top 30 automotive suppliers globally and is the world market leader for combustion engine components, systems and peripherals. MAHLE employs approximately 45,000 employees in over 100 production plants and eight research and development centers. In 2008, MAHLE generated sales in excess of EUR 5 billion (USD 7.3 billion).
Öhringen, 04/2010