Seal manufacturing method

Seal manufacturing method

PATENTS elastomer moulding is also described. The patent includes details of the manufacturing process. Patent number: WO/2010/010507 Inventors: M. Be...

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PATENTS elastomer moulding is also described. The patent includes details of the manufacturing process. Patent number: WO/2010/010507 Inventors: M. Bertini and R. Ravanelli Publication date: 28 January 2010

Seals for use on horizontal mixer shafts

An example of the gasket for an exhaust system, detailed by patent WO/2010/009801. It is designed to be flexible and capable of operating at high temperatures.

Metallic manifold gasket

Inventors: A. Fesl and P Dröscher Publication date: 28 January 2010

Applicant: Reinz-Dichtungs-GmbH, Germany The subject of this patent is a gasket for a vehicle exhaust system. It is designed to operate reliably with increasing temperature, and meet reduced leakage requirements of modern engines, while being able to withstand high differential temperatures between engine components. In order to provide flexibility, the gasket is composed of a tubular section with protrusions that are designed to create a seal on, for instance, the bore of the exhaust port, and the bore of the mating exhaust manifold. The tubular section also may have a bellowstype convolution between the flanges – where a conventional gasket normally would be placed. This absorbs shear forces caused by the relative movement of the flanges. Patent number: WO/2010/009801 Inventors: K. Hoehe, J. Waldvogel, J. Schneider, E. Widmann, J. Salzmann, B. Ruess and H. Rebien Publication date: 28 January 2010

Seal manufacturing method Applicant: Tenute Srl, Italy This is concerned with large-diameter elastomeric rotary, shaft lip seals for rolling mill applications. The seals have a garter spring that is retained by a coil or leaf spring, which is clamped to the seal casing. To reduce manufacturing costs and improved flexibility the leaf spring retention is modified to function as a radially acting retainer. The seal casing is also redesigned to include reinforcing elements within the moulding. A dual hardness

ed by patWO/2010/009801. It is designed to be flexible and capof operating at high temperatures.

Seal arrangement with a filter element Applicant: Burgmann Industries GmbH & Co Kg, Germany This patent describes a filter arrangement that is designed to protect the secondary sliding seal from contamination by particles in the sealed product. A flexible mesh structure is positioned between the spring and the secondary seal and is attached to the drive ring and the flexiblymounted seal rotor. A number of designs are illustrated for different seal configurations. Patent number: WO/2010/009835

May 2010

An example of the prior art (top) and the new seal design (bottom) for rolling mill applications. Patent WO/2010/010507 has further details.

Applicant: Meccanotecnica Umbra Spa, Italy This patent describes mechanical seals for use on horizontal mixer shafts, in applications that involve cement, mortar and other setting, adhesive products. The seals appear to be typical designs used for abrasive slurry duties, with a smooth exterior to the product side and external spring arrangements. A quad-ring and O-ring are used in series on the outside diameter (OD) of the floating seal component – the quad-ring apparently protects the O-ring from the sealed product. There is a constricted entrance to a largediameter, conical seal housing. The seal housing also may be packed with dry product to prevent it setting around the seal. Patent number: WO/2010/012317 Inventor: N. D’Orazio Publication date: 4 February

Leaf seal Applicant: Alstom Technology Ltd, Switzerland The subject of this patent is a leaf seal for use on axial flow turbo-compressors. Blowdown forces are greater on the low-pressure side of the leaf seal than on its high-pressure side, resulting in greater inward deflection of the leaves on the low-pressure side than on the high-pressure side. This, in turn, leads to greater wear of the leaves and the contacting rotor surface on the low-pressure side of the seal. To counteract this, the free ends of the leaves can be given a tapered profile. This is done in order to gradually reduce the length of each leaf over its width ‘w’ – from the high-pressure side to the low- pressure side – in such a way that they (leaves) are free to deflect, under the blow-down forces, by the amount by which their length has been reduced (a maximum of ‘x’), before they contact the rotor surface. As an alternative to ‘profiling’ the rotor-contacting ends of the leaves, the leaf-contacting surface of the rotor can be given a tapered profile in a ‘mirror-reversed’ version of the leaf-end profile. Patent number: WO/2010/012655 Inventor: N. Howes Publication date: 4 February

Sealing Technology