Utveckling av spjäll till plattvärmeväxlare
This thesis work concerns a development of a damper and damper blades for a plate heat exchanger. The plate heat exchanger is included in Fläkt Woods AB’s product programme.The background for this development was caused by two problems with the existing damper. One of the problems was that it had some problems with the hygiene. This needed to be corrected and the product needed to be replaced with a better solution, allowing it to be certified according to VDI 6022. The second problem was that the design felt rather old and it needed to be improved.The thesis work is divided into two main parts/main goals. The first of them is to find a material to seal the product in an effective way. Because there is a conflict regarding low friction and a good sealing there was a large material investigation done and a list of possible materials was done and analysed. Different types of treatments were also found to reduce the friction. The type of materials that was most interesting was rubber and elastomers. Nitrile rubber, treated EPDM rubber and treated SBR rubber was the ones to fulfil the wanted requirements in the best way. The different types of treating a rubber material are among other things, painting the material with a special type of lacquer or chlorination of the rubber.The second part of the thesis work is about the design. Several product ideas on dampers and damper blades will here be presented. These were developed by applying tools and methods for product development, like TIPS/TRIZ and QFD. Searching for patents, benchmarking of competing products and a simulation of the blades bending are some of the parts on the way to find the final product.The result of this is three products, which will work as suggestions to Fläkt Woods AB. The products differs both in design, way of manufacture and in cost to offer many options. The first idea has a design of two metal sheets which is bended and joined together. This is a stable and robust design. The second idea contains forming sheets of steel which is then made into profiles. This is made in the method of roll forming. This gives the product an appropriate shape and the product is easy to handle. The third idea is made in the method of aluminium extrusion. It is made in one piece and contains several functions. Among other things, it has integrated reinforcement, a hole for the axle and two holes for rubber profiles (sealing).
School:Högskolan i Jönköping
Source Type:Master's Thesis
Keywords:damper blade heat exchanger ventilation rubber design product development
Date of Publication:06/25/2007