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1

Experimental research on effectiveness of the magnetic fluid seals for rotary shafts working in water

100%
Szydlo Z., Matuszewski L.
Polish Maritime Research
|
2007
|
tom 14
|
nr 4
This paper presents course of research on ferro-fluidal seals used in water. The tests were carried out fora hydrophobic magnetic fluid and specially selected profiles of sealing lips at various linear velocitiesin sealing unit. Though the tests were preliminary their results showed that the research on application of magnetic fluids to seals working in liquid environment should be continued. From the point of view ofdevelopment of ring drives the most important advantage of ferro-fluidal seals is their smallest drag ascompared with seals of other types
2

The application of magnetic fluids in sealing nodes designed for operation in difficult conditions and in machines used in sea environment

100%
Matuszewski L., Szydlo Z.
Polish Maritime Research
|
2008
|
tom 15
|
nr 3
Presented in article MF seals are being researched for sea technology purposes due to their excellent tightness and low resistance of motion. These features are most valuable for ring propellers and ship’s main propeller shaft. There are more reasons why technologists payf significant attention for various MFseals applications in their difficult operating conditions. For instance, an advanced pumping systemsare designed with contactless (screw or centrifugal) fluid seal used as the first stage seal and then theMF seal as the main seal. Further parts of the article contain discuss of the properties of magnetic fluidsin the construction of MF seals. Sample of the few systems of magnetic fluid seals are presented, whichhave been researched lately in our laboratory including sea conditions. The magnetic fluids used in ourseals are colloidal suspensions of magnetic nanoparticles. Undertaken earlier various systems selection for sea-water purposes forced us to focus on double sealing systems, in which the MF seal is used as the second seal following a conventional system especially adapted to co-operation with MF systems. This solution successfully limits direct contact of the sealed liquid with the magnetic fluid,andtheentiresealingconstruction secures absolute tightness of the system. Using this solution we also can reduce costs by elements high accuracy avoidance. Research and design activities are carried out in the AGH Laboratory of Seals and Magnetic Fluid Applications together with Deep Water Department of Technical University of Gdansk over the use of magnetic fluid seals in sea water environment. These activities are oriented on working outMF seals able to work effectively in machines in which low-pressure water flow takes place. The objectsof experimental investigations are seals having two different nominal diameters: 50 mm and 220 mm and two research rigs of different construction had to be built up. Works are scheduled to be continued
3

Life tests of a rotary single-stage magnetic-fluid seal for shipbuilding applications

100%
Matuszewski L., Szydlo Z.
Polish Maritime Research
|
2011
|
tom 18
|
nr 2
Use of the magnetic fluid seal technology in water is much more difficult technological problem in comparison to gas or vacuum environment. Some seals constructed up to time been are designed as hybrid, two stage sealing structures with shields or mechanical seals used as protection measures to the magnetic fluid seal. Anyway, there is always problem with immediate contact between magnetic fluid and the environmental liquid. In the paper are presented results of experiments carried out with one stage rotating magnetic fluid seal operating in immediate contact with utility water. The special test procedures have been elaborated and practically used, with the aim to define main characteristics of magnetic fluid seals and to simplify experiments. These characteristics were: critical pressure, critical motion velocity and working life of the seal. Four grades of commercial, silicon based magnetic fluids of hydrophobic properties were tested in a single stage sealing system. The results of tests are presented in the form of tables and diagrams. It is concluded that hydrophobic commercial magnetic fluids could be efficiently used in rotating shaft seals however in a limited range of motion velocity
4

Ring thruster - a preliminary optimisation study of ferrofluid seal and propeller

100%
Szydlo Z., Matuszewski L.
Polish Maritime Research
|
2007
|
nr Special Issue S1
The article reports the course of preliminary examination of a ferrofluid seal applied in liquid environment.A newly built research rig is described, and results of pressure tests performed for different shaft rotations are discussed. Other studies carried out in the past only referred to the gas environment, while the present examination aims at finding an answer to the question whether magnetic liquids can be successfully usedin under water applications. The obtained answer is positive, but further, more comprehensive investigations of the problem are necessary
5
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Charakterystyka suszarnicza torfu

100%
Szarycz M., Szydlo Z.
Zeszyty Problemowe Postępów Nauk Rolniczych
|
1984
|
tom 287
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