Målet med det här projektet är att bygga ett tillförlitligt pumpsystem som inte är beroende av elektricitet eller icke förnyelsebara bränslen. Pumpen ska klara att pumpa 50-100 liter per dygn till en höjd av 10 meter. Konstruktionen ska placeras i indianbyn El Vergel i Amazonas, Colombia. Pumpen ska pumpa orent vatten till vattenreningstunnor de månader som invånarna i byn inte har tillgång till regnvatten. Olika koncept arbetades fram och utvärderades. Det som valdes var en cykeldriven vattenpump, vilken uppfyllde alla krav. Pumpens axel är kopplad till bakhjulets fälg med en kilrem. När tramporna snurrar så överförs kraften från det främre kugghjulet till det bakre med cykelkedjan och sen med kilremmen från fälgen till pumpaxeln. Konstruktionen är enkel och den är lätt att laga om den går sönder. Resultaten är en tillförlitlig pump som pumpar med ett jämt flöde.

<p>Målet med det här projektet är att bygga ett tillförlitligt pumpsystem som inte är beroende av elektricitet eller icke förnyelsebara bränslen. Pumpen ska klara att pumpa 50-100 liter per dygn till en höjd av 10 meter. Konstruktionen ska placeras i indianbyn El Vergel i Amazonas, Colombia. Pumpen ska pumpa orent vatten till vattenreningstunnor de månader som invånarna i byn inte har tillgång till regnvatten.</p><p>Olika koncept arbetades fram och utvärderades. Det som valdes var en cykeldriven vattenpump, vilken uppfyllde alla krav.</p><p>Pumpens axel är kopplad till bakhjulets fälg med en kilrem. När tramporna snurrar så överförs kraften från det främre kugghjulet till det bakre med cykelkedjan och sen med kilremmen från fälgen till pumpaxeln. Konstruktionen är enkel och den är lätt att laga om den går sönder. Resultaten är en tillförlitlig pump som pumpar med ett jämt flöde.</p>

En lämplig pumpanordning är avgörande för hantering av stora mängder vatten. I det här arbetet kommer fokus ligga på pumpar som består av öppna pumphjul. Vid montering av pumpen bildas en spalt mellan insatsring och pumphjul, som bör ligga inom intervallet 0,5–0,8 mm för optimal effekt. Beroende på toleranskedjor i pumpens ingående komponenter varierar denna spalt mellan olika fall. Spalten justeras idag genom trimbrickor som placeras under insatsringen. Processen kallas för trimning och kräver en mer tidseffektiv lösning eftersom dagens lösning bygger på metoden ”trial and error”. Målet med projektet var således att konstruera ett universalverktyg i syfte att effektivisera trimningsprocessen tidsmässigt. Vidare var målet att även testa verktygets funktionalitet genom en 3D prototyp. Projektet avgränsades i sin tur till att inte undersöka alternativa trimningsmetoder, designändringar på pumpen, tillverkningskostnader samt materialval. Arbetet startades genom ett produktionsbesök i syfte att öka förståelsen kring problemet samt det aktuella pumpsortimentet. Vidare undersöktes bland annat befintliga mätverktyg, standardkomponenter samt relevant antropometri. Dessutom analyserades diverse funktioner och behov som verktyget behövde uppfylla. Därefter påbörjades idegenereringsarbetet främst genom brainstorming, varvid ett koncept valdes för vidareutveckling. Det slutgiltiga resultatet är ett universalverktyg som går att tillämpa på samtliga pumpar i sortimentet för att effektivisera trimningsprocessen. / A suitable pumping device is essential for handling large quantities of water. This study focuses on pumps consisting of open impellers. When installing the pump, a gap is formed between the insert ring and impeller. This gap should be within the range of 0.5–0.8 mm for optimal effect. Depending on tolerance chains in the pump's constituent components, this gap varies between different cases. Currently, the gap is adjusted using trim washers that are placed beneath the insert ring. The process is called trimming and requires a more time efficient solution since the current solution is based on a "trail and error" method. Therefore, the objective of the project was to construct a universal tool with the aim of streamlining the trimming process in terms of time. Additionally, the goal was to test the tool's functionality through a 3D prototype. In turn, the project was limited to not investigating alternative trimming methods, design changes to the pump, manufacturing costs and material selection. The work was commenced through a production visit with the aim of increasing comprehension of the problem and the current pump range. Furthermore, an examination of existing measuring tools, standard components and relevant anthropometry was carried out. In addition, various functions and needs that the tool required to fulfill were analyzed. Thereafter, the idea generation work began mainly through brainstorming, whereby a concept was chosen for further development. The result of the project is a universal tool that can be applied to all pumps in the range to streamline the trimming process.

This project is a combination of mechanical engineering and sustainable development in developing countries. The goal has been to build a windmill driven water pump and to design a small-scale irrigation system for SCC-Vi Agroforestry’s demonstration farm in Musoma, Mara region, Tanzania. The purpose was to enable SCC-Vi Agroforestry to demonstrate and spread knowledge about these techniques to farmers in the region. In 2007, two students from Halmstad University conducted a field study in the Mara region and found that many farmers lack clean and running water. Back in Sweden they constructed a prototype of a windmill that employs wind energy to pump water using a semi-rotary pump. The intention is that local farmers should be able to build their own windmill, and thus have running water in their household. However, the windmill has never been built in Tanzania. The windmill construction in this report is based on the prototype, but the original drawings were changed to fit the specific situation in Tanzania better. Important throughout the project has been to minimise cost and to only use material that local farmers can get hold of. Building and assembling of the windmill were then performed by the authors in co-operation with local workers. The windmill drives a pump that pumps water from a well to a tank for further use in irrigation. Calculations have been made on the energy available in the wind and an energy analysis was then performed to see what wind speed is required for the system to work. If wind speed is low, the windmill can be adjusted by placing the connecting rod closer to the rotation centre where it requires less work to function. As a result of that, the volume of water per stroke will decrease and it will take longer time to fill the tank. This project was carried out during the rainy season when there is less wind; therefore the windmill has not been tested during optimal wind speed conditions. The tests that have been performed during the circumstances at the time showed that the performance of the windmill is consistent with the theoretical calculations. A proposed design for a simple drip irrigation system has been developed based on the conditions at the project area. It is constructed of plastic pipes with holes that emit water. Covers are in place to prevent soil from clogging the holes. Building the irrigation system was not part of this project.

<p>This project is a combination of mechanical engineering and sustainable development in developing countries. The goal has been to build a windmill driven water pump and to design a small-scale irrigation system for SCC-Vi Agroforestry’s demonstration farm in Musoma, Mara region, Tanzania. The purpose was to enable SCC-Vi Agroforestry to demonstrate and spread knowledge about these techniques to farmers in the region.</p><p>In 2007, two students from Halmstad University conducted a field study in the Mara region and found that many farmers lack clean and running water. Back in Sweden they constructed a prototype of a windmill that employs wind energy to pump water using a semi-rotary pump. The intention is that local farmers should be able to build their own windmill, and thus have running water in their household. However, the windmill has never been built in Tanzania.</p><p>The windmill construction in this report is based on the prototype, but the original drawings were changed to fit the specific situation in Tanzania better. Important throughout the project has been to minimise cost and to only use material that local farmers can get hold of. Building and assembling of the windmill were then performed by the authors in co-operation with local workers. The windmill drives a pump that pumps water from a well to a tank for further use in irrigation.</p><p>Calculations have been made on the energy available in the wind and an energy analysis was then performed to see what wind speed is required for the system to work. If wind speed is low, the windmill can be adjusted by placing the connecting rod closer to the rotation centre where it requires less work to function. As a result of that, the volume of water per stroke will decrease and it will take longer time to fill the tank. This project was carried out during the rainy season when there is less wind; therefore the windmill has not been tested during optimal wind speed conditions. The tests that have been performed during the circumstances at the time showed that the performance of the windmill is consistent with the theoretical calculations.</p><p>A proposed design for a simple drip irrigation system has been developed based on the conditions at the project area. It is constructed of plastic pipes with holes that emit water. Covers are in place to prevent soil from clogging the holes. Building the irrigation system was not part of this project.</p>