Wyniki wyszukiwania - BazTech

1

The influence of water and mineral oil on volumetric losses in the displacement pump for offshore and marine applications

Śliwiński Paweł

Polish Maritime Research

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2019

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nr 2

173--182

EN

In this paper, volumetric losses in a positive displacement pump supplied with water and mineral oil are described and compared. The experimental tests were conducted using a prototype of a satellite pump (with a non-circular tooth working mechanism). In this paper, the sources of volumetric losses in this pump are characterized. On this basis, a mathematical model of these losses has been presented. The results of the calculation of volumetric losses according to the model are compared with the results of the experiment. Experimental studies have shown that the volumetric losses in the water pump are even 3.2 times greater than the volumetric losses in the oil pump. It has been demonstrated that the mathematical model describing the volumetric losses both in the water pump and in the oil pump is quite good. It has been found that the results from the loaded pump simulation (at Δp=25MPa and ant n=1500rpm) differ from the results of the experiment by no more than 5% both for oil and water.

2

New generation of the satellite hydraulic pumps

Osiecki Leszek

Journal of Mechanical and Energy Engineering

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2019

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Vol. 3, No 4

309--314

EN

Hydraulic satellite machines are known and produced in many versions, recognizable by the number of humps on their inner rotor and external gear, and therefore by the number of cooperating gears (satellites). All known shapes were however designed on the base of preliminary assumption that rotor’s and external gear’s pitch lines are formed by merging arcs, tangent to each other in the. This assumption makes calculations easier, but the curvature radius of the pitch lines changes instantly in their merging points. Tests made in the Department of Hydraulics and Pneumatics of the Gdańsk University of Technology proved that satellite motors may work also as a pump. All known shapes were however designed for motor work - mainly for low-speed, high-torque motors. Sudden changes of the pitch line’s curvature strongly affect velocity and acceleration of pump’s moving parts and forces between them. Because of that, in the pump mode fast wear of teeth in the points of small curvature radius is visible. The obvious effect is reduced durability and high noise emission. To eliminate all those problems the new mechanism, designed for the pump is necessary. The author worked out the new method of calculating satellite mechanism’s shape. Instead of merged arcs this method allows to form pitch line as a smooth shape with constantly variable curvature (no rapid changes in any point). Such a mechanism with two-humped rotor, four-humped external gear and six satellites was designed with the use of the new method. Curvature radii of all cooperating elements are relatively high. The proposed shape reduces rapid changes of velocity and forces between pump’s elements. It should result in more durable hydraulic satellite pump.

3

The influence of water and mineral oil on mechanical losses in the displacement pump for offshore and marine applications

Śliwiński P.

Polish Maritime Research

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2018

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S 1

178--188

EN

In this paper mechanical losses in a positive displacement pump supplied with water and mineral oil (two liquids having significantly different viscosity and lubricating properties) are described and compared. The experimental tests were conducted by using a prototype satellite pump of a special design. The design of the satellite pump is presented in the article. The pump features and a non-circular tooth working mechanism was developed to work with both water and mineral oil. The sources of mechanical losses in such pump are also characterized in this paper. On this basis, a mathematical model of the losses has been developed and presented. The results of the calculation of mechanical losses according to the model are compared with the results of the experiment. The experimental studies have shown that the mechanical losses in the water pump are even 2.8 times greater than those in the oil pump. It has been demonstrated that the mathematical model well describes the mechanical losses both in the water pump and the oil pump. It has been found that the results from the loaded pump simulation (at Δp=25MPa) differ from the results of the experiment by no more than 5% both for oil and water.

4

Rozwój konstrukcji pomp satelitowych

Osiecki L.

Napędy i Sterowanie

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2018

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R. 20, nr 12

84--88

PL

Artykuł prezentuje budowę i działanie hydraulicznej pompy satelitowej. Zbudowane i przebadane prototypy nowej pompy wykazały się wysokimi parametrami pracy i zdolnością tłoczenia różnych cieczy: oleju, wody i emulsji HFAE. Mechanizm pompy tworzą dwie nieokrągłe uzębione bieżnie: zewnętrzna obwodnica i wewnętrzna planeta oraz umieszczone pomiędzy nimi koła zębate (satelity). Obecny kształt planety i obwodnicy powoduje szybkie zużycie zębów, obniżając trwałość pompy. Aby uzyskać w pełni funkcjonalny produkt, konieczne są zmiany kształtu mechanizmu pompy. Artykuł prezentuje metodę wyznaczania nowego kształtu i wyniki wstępnej analizy.

EN

The article describes the design and operation of the satellite hydraulic pump. Two versions of the new pump were built and tested, showing good performance and ability to work with different fluids: oil, water and HFAE emulsion. The pump’s mechanism consists of a non-circular gear with external teeth (planete), non-circular gear with internal teeth (curvature), and circular gears (satellites) between them. Present shape of the planete and curvature causes fast wear of teeth and reduces pump’s durability. To make the pump fully operational changes of the mechanism shape are necessary. Methods of determination of the corrected shape and preliminary results of the analysis are shown.

5

Pompy satelitowe

Śliwiński P.

Hydraulika i Pneumatyka

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2012

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nr 5

27-30

PL

Opisano budowę pompy satelitowej. Przedstawiono wyniki badań dotyczących strat objętościowych, mechanicznych, ciśnieniowych i poziomu emitowanego hałasu. Wskazano na wykorzystanie w badaniach oleju, wody i emulsji HFA-E, jako cieczy roboczych.

EN

In the article construction and results of laboratory research of satellite pump have been described. The tests concern volumetric losses, mechanical losses, pressure losses and level of noise and were conducted with use of oil, water and emulsion HFA-E.