Automatisk filterrengöring i en torktumlare

Abstract

This Master Thesis has been performed as a development project for Asko Cylinda AB
in Vara, Sweden. The company develops, manufactures and markets conventional
tumble dryers among many other products. An important part of a tumble dryer is the
filter holder with belonging fuzz filters mounted on the door of tumble dryer’s. The
fuzz filter’s objective is to filtrate the hot drying air that pass through. The air
contains of threads, fibres and hair released from the clothes inside the dryer.
Currently the fuzz filter has to be cleaned manually, which is regarded to be difficult
and unhygienic. Neglecting the maintenance of the fuzz filter can contribute to
reduced efficiency on the machine.
The purpose of this project is to develop a new concept for automatic cleaning of fuzz
filters. There was previous thesis published in UiS, University in Skövde, which was
used as a basis for this project. In order to clarify the problem the prior thesis was
studied.
This project follows a step-by-step method to make the development process easier.
The method is published by Eppinger S. and Ulrich K. in Product Design And
Development. Since the problem already was defined only a smaller survey and a
benchmarking were conducted. The survey showed that there is currently no similar
product on the European and Scandinavian market. It also pointed out that there is a
need of the product.
When the survey was completed a number of solution proposals were generated. The
proposals where evaluated in two steps. The first step consisted of a coarse evaluation
while the second evaluation where more accurate. The solutions with most potential
for success were further developed.
The final concept consists of a cylindrical fuzz filter. The fuzz filter rotates with a low
rotation speed while a scraper attached to the filter holder removes the fuzz from the
filter. The removed fuzz is later collected in a fuzz container. The fuzz container is
transparent so that the user easily can see when the container is full. The rotational
direction switches from time to time so that the fuzz is distributed evenly in the
container. This also prevents fuzz from getting caught between the filter holder and
the filter. An electrical engine generates the rotation force.
A primary construction was compiled with unique components and a selection of
already existing components. The components where subsequently assembled and
drawings were drawn for every unique component. The drawings are attached to the
report as appendixes. Several physical plaster models were printed on a 3D-printer.
The models provided important information that led to improvements on the product.
A flowing analysis was made in CF Design® to investigate how the air flows through
the construction.

• author: Toll, Elias
• supervisor: Ola Carlqvist
• organization: Innovation
• course: MMK820
• year: 2007
• type: H2 - Master's Degree (Two Years)
• subject: Technology and Engineering
• language: Swedish
• id: 1497213
• date added to LUP: 2009-11-09 10:20:58
• date last changed: 2010-02-01 14:40:04