Wieland Werke AG | Date: 2017-01-26
A metal heat exchanger tube for the evaporation of liquids on the outside of the tube, having a tube axis, a tube wall, and integrally formed ribs that run circumferentially on the outside of the tube. The ribs have a rib foot, rib flanks, and a rib tip, wherein the rib foot projects substantially radially from the tube wall. A respective groove is located between every two ribs that are adjacent to one another in the axial direction. At least first, second, and third lateral material projections, which are formed from the material of the ribs, are arranged on a first, second, and third level on the rib flanks in such a way that the grooves are largely covered by all of the material projections. The first, second, and third lateral material projections are formed on levels that are in each case differently spaced apart from the tube wall in the radial direction.
Agency: European Commission | Branch: FP7 | Program: CP-FP | Phase: FoF.NMP.2013-10 | Award Amount: 5.01M | Year: 2013
The most common traditional materials used in electrical energy distribution systems are copper and copper alloys. Modern applications show an increasing demand for better heat and electric current carrying capacity at the level beyond copper base materials. Nanocarbon materials, such as carbon nanotubes and graphene have attracted attention due to their high electrical, thermal conductivity and exceptional mechanical properties. It would appear that combining copper with high performance nanocarbons towards composite materials could offer immediate solution to problems encountered currently. Copper nanocarbon composites could form the next generation of conductors, where copper contributes the benefits of electrical conductivity, whereas nanocarbon brings to this composite its low weight, flexibility, mechanical reinforcement and thermal management. Recent breakthrough in the chirality control of carbon nanotubes could contribute significantly to the electrical conductivity of these composite materials beyond the performance achieved by bulk copper conductors. The material and process costs required to achieve improvement of the overall performance of copper based electrical conductors, need to be compatible with large scale conductor manufacturing and overcome the issues such as the cost of the nanocarbons and the difficulty of scaling up the production processes. This proposal is aimed at developing a copper nanocarbon composite with significantly improved overall properties, including electrical, thermal and mechanical performances over bulk copper. The proposal also aims to develop production process that will be scalable to large volume manufacture. A key breakthrough will be the development/modification of the continuous carbon nanotube fibre process originating from Cambridge University for copper composite production, an inherently larger volume process for the production of carbon nanotube with high degree of structural control and molecular orientation.
Wieland Werke AG | Date: 2015-04-09
The invention relates to a sliding element, which consists at least of a main body and a layer system which is applied thereto. The layer system comprises at least a first layer of the thickness s_(1), which is applied to the main body, and hard material particles having a mean extent d, which are introduced into the first layer and are therefore at least fixed on the main body. According to the invention, the thickness s_(1 )of the first layer is such that it amounts to at least 60% and at most 90% of the mean extent d of the hard material particles, and the hard material particles form a surface structuring of the sliding element.
Wieland Werke AG | Date: 2016-03-04
Wieland Werke AG | Date: 2014-08-27
A heat exchanger tube with a tube axis and with a tube wall having a tube outside and a tube inside, axially parallel or helically encircling inner ribs, with a groove which lies in each case between adjacent inner ribs, being formed from the tube wall on the tube inside, the helix angle, measured with respect to the tube axis, of the inner ribs being smaller than or equal to 45, the region of the inner ribs which is remote from the tube wall being deformed at regular intervals asymmetrically on one side essentially in the tube circumferential direction, the deformed material of the inner ribs forming protrusions above the groove, the protrusions extending in each case over a finite deformation zone along an inner rib, the markedness of the deformation changing continuously within the deformation zone.
Wieland Werke AG | Date: 2015-11-09
Wieland Werke AG | Date: 2015-09-09
A heat exchanger tube with a tube axis, a tube wall, a tube outside and a tube inside. Continuously running, axially parallel or helically circling inner ribs are formed out of the tube wall on the tube inside, each inner rib having two rib flanks and a rib tip. A continuously extending groove is formed between adjacent inner ribs. The rib tip has at regular intervals recurring elevations which have an essentially frustopyramidal form. The inner ribs are raised in the radial direction on the contour line which is defined by the transitional edge of a rib flank to the rib tip and protuberances advancing out of the rib flank are formed in this region. Furthermore, the invention relates to a method for producing a heat exchanger tube.
Wieland Werke AG | Date: 2015-08-18
The invention relates to a squirrel-cage rotor for an asynchronous machine, said squirrel-cage rotor having at least one laminated rotor core that comprises a plurality of grooves and said squirrel-cage rotor having at least one rotor cage comprising electrically conductive rotor bars that are embedded in the grooves of the laminated rotor core in such a manner that the rotor bars comprise at their two end regions an overlap beyond the laminated rotor core, and said rotor cage comprising short-circuit rings that are attached at the end face to the laminated rotor core and comprise a plurality of slots that are arranged in the region of their outer periphery and the end regions of the rotor bars protrude into said slots. The short-circuit rings comprise in each case at least two metal composite discs that comprise at least a first metal disc and a second metal disc that is connected in a planar manner to said first metal disc and is embodied from a different material thereto. Adjacent metal composite discs are arranged at least in part in such a manner that the first metal discs are facing one another. The rotor bars are bonded to the first metal discs in the region of the slots.
Wieland Werke AG | Date: 2016-09-28
The invention includes a copper-nickel-zinc alloy with the following composition in weight %: Cu 47.0 to 49.0%, Ni 8.0 to 10.0%, Mn 0.2 to 0.6%, Si 0.05 to 0.4%, Pb 1.0 to 1.5%, Fe and/or Co up to 0.8%, the rest being Zn and unavoidable impurities, wherein the total of the Fe content and double the Co content is at least 0.1 weight % and wherein mixing silicides containing nickel, iron and manganese and/or containing nickel, cobalt and manganese are stored as spherical or ellipsoidal particles in a structure consisting of an - and -phase. The invention further relates to a method for producing semi-finished products from a copper-nickel-zinc alloy.
Wieland Werke AG | Date: 2015-02-10
The invention relates to a metal heat exchanger tube, comprising integral ribs formed on the outside of the tube. Said ribs have a rib base, rib flanks, and a rib tip. The rib base protrudes substantially radially from the tube wall. A channel is formed between the ribs, in which channel additional structures spaced apart from each other are arranged. The additional structures divide the channel between the ribs into segments. The additional structures reduce the cross-sectional area in the channel between two ribs through which flow is possible by at least 60% locally and, at least thereby, limit a fluid flow in the channel during operation.