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1
Content available Multi-stage magnetic-fluid seals for operating in water - life test procedure, test stand and research results. Part II Results of life tests of multi-stage magnetic - fluid seal operating in water
Matuszewski L.
Polish Maritime Research
|
2013
|
nr 1
39--47
EN
The edge criteria for magnetic-fluid seals durability research were described in previous article [24] and now the tests results are presented. The tests were made with three magnetic fluids using various magnets quantity in magnetic assemblies. If values obtained in the repeated test deviated by more than 10 % from results of the first test an additional control test was made for final characteristics. The characteristics are: critical pressure, critical motion velocity and working life of the seal. The test stands were prepared for particular seals dimensions and results of tests are presented in the form of tables, cross section draws and diagrams. In conclusion one can see that multi-stage magnetic-fluid seals could be efficiently used in water for rotating shaft seals in a limited range of motion velocity and cycles quantity. Nevertheless a particular applications can be provided by magnetic-fluid seals only.
2
Content available Multi-stage magnetic-fluid seals for operating in water – life test procedure, test stand and research results. Part. I. Life test procedure, test stand and instrumentation
Matuszewski L.
Polish Maritime Research
|
2012
|
nr 4
62--70
EN
The edge criteria for magnetic-fluid seals durability research are critical for the seal’s technological usefulness. The magnetic fluid seal technology in water is much more difficult technological problem in comparison to gas or vacuum environment. There is always problem with immediate contact between magnetic fluid and the environmental uninspected liquids. In the paper are presented ways of experiments definitions carried out with multi-stage rotating magnetic fluid seal operating in permanent 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. These characteristics were: critical pressure, critical motion velocity and working life of the seal. Some grades of commercial, silicon based magnetic fluids of hydrophobic properties were tested in sealing system. The test stand and its features as well as results of tests are presented in the form of tables, cross section draws and diagrams. In conclusion one can see that multi-stage magnetic-fluid seals could be efficiently used in water for rotating shaft seals in a limited range of motion velocity and work lasting.
3
Content available Life tests of a rotary single-stage magnetic-fluid seal for shipbuilding applications
Matuszewski Leszek, Szydło Zbigniew
Polish Maritime Research
|
2011
|
nr 2
51--59
EN
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
Content available Doszczelnienie zlikwidowanego szybu Górsko w Kopalni Soli "Wieliczka"
d'Obyrn K., Kokot B., Kucharz J.
Górnictwo i Geoinżynieria
|
2011
|
R. 35, z. 4
41-48
PL
W artykule przedstawiono rozwiązania techniczne związane z uszczelnieniem zlikwidowanego szybu Górsko w Kopalni Soli "Wieliczka" Z uwagi na stwierdzone na poszczególnych poziomach kopalni wycieki w otoczeniu szybu zachodzi konieczność wykonania uszczelnienia górnego odcinka szybu od powierzchni terenu do granicy warstw czwartorzędowych z warstwami trzeciorzędowymi. Zadaniem cementacji doszczelniającej w szybie Górsko jest: zlikwidowanie dopływu wód powierzchniowych i ługowania przez nie górotworu solnego w otoczeniu szybu, uzyskanie płaszcza betonowego wokół rury szybu Górsko oraz zespolenie masywu skalnego do stanu zapewniającego jego stateczność.
EN
This paper presents technical solutions related to the sealing of the liquidated Gorsko Shaft in the Wieliczka Salt Mine. Due to the identified spills in the surroundings of the shaft at different levels of the mine, sealing is necessary in the upper part of the shaft from the surface to the boundary between the tertiary and quaternary layers. The goals of sealing cementation of the Górsko Shaft is: i) to eliminate surface water inflow leaching salt deposits into surroundings of the shaft, ii) obtain a concrete coat around the Gorsko Shaft tube, and iii) consolidate rock massif to ensure stability of the salt rock formation.
5
O uszczelnieniach mechanicznych
Świtalski P.
Pompy, Pompownie
|
2006
|
nr 1 (120)
14-17
PL
Piąty artykuł z cyklu ABC Techniki Pompowej wyjaśnia zasadę działania uszczelnień, ich doboru i obsługi. Omawia podstawowe konstrukcje oraz przyczyny niesprawności uszczelnień i na tej podstawie wskazuje warunki niezawodnej eksploatacji.
EN
Basic information on design, application and operation. Most common faults, reasons and troubleshooting.
6
Jeszcze o uszczelnieniach dławic pomp
Świtalski P.
Pompy, Pompownie
|
2006
|
nr 1 (120)
17-19
PL
Użytkownicy pomp dzialą się doświadczeniami z eksploatacji pomp z uszczelnieniami miękkimi oraz bezpostaciowymi. Autorzy korespondencji wskazują na walory i kierunki rozwoju tej techniki uszczelniania.
EN
Remarks concerning the article "ABC Pumps essentials. Shaft seals with soft packings" from the last issue of Pompy-Pompownie.
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