Method of determining the degree of liquid aeration in a variable capacity displacement pump

• Autorzy: Paszota Z.
• Języki publikacji: EN

Abstrakty

EN

The Author concludes, that there is a possibility of determining a concrete value of the liquid aeration coefficient ε during the pump operation by finding such value of ε with which the increase ΔMPm|ΔpPi = pn, qPgv of torque of mechanical losses is proportional to the indicated torque MPi|ΔpPi = pn, qPgv determined with a fixed value ΔpPi = cte of increase of pressure in the pump working chambers. The fixed value ΔpPi assumed in searching the liquid aeration coefficient ε equals to the nominal pump operation pressure pn (ΔpPi = cte = pn ). The increase ΔMPm|ΔpPi = pn, qPgv of torque of mechanical losses with a fixed value of ΔpPi (ΔpPi = cte) is proportional to the pump geometrical working capacity qPgv , therefore: only with taking into account the aeration coefficient ε of liquid displaced by the pump the relation ΔMPm|ΔpPi = pn, qPgv ~ qPgv can be obtained from tests. The method, proposed by the Author, of determining the working liquid aeration coefficient ε, is presented in this paper and has been practically applied for the first time by Jan Koralewski in his investigations of the influence of viscosity and compressibility of aerated hydraulic oil on volumetric and mechanical losses in a pump of HYDROMATIK A7V.58.1.R.P.F.00 type [8, 9].

Słowa kluczowe

EN

hydrostatic drive; variable capacity displacement pump; liquid aeration; method of determining the degree of liquid aeration

• Wydawca: Gdańsk University of Technology, Faculty of Ocean Engineering & Ship Technology
• Czasopismo: Polish Maritime Research
• Rocznik: 2013
• Tom: nr 3
• Strony: 3--13
• Opis fizyczny: Bibliogr. 10 poz., rys.

Twórcy

autor

Paszota Z.

• Faculty of Ocean Engineering and Ship Technology Gdansk University of Technology Narutowicza 11/12 80-233 Gdansk, POLAND

Bibliografia

• 1. Paszota Z.: Effect of the working liquid compressibility on the picture of volumetric and mechanical losses in a high pressure displacement pump used in a hydrostatic drive. Part I Energy losses in a drive system, volumetric losses in a pump //International Scientific-Technical Conference Hydraulics and Pneumatics, Wrocław, 16 – 18 maja 2012 / Ośrodek Doskonalenia Kadr SIMP - Wrocław : ODK SIMP we Wrocławiu, 2012,
• 2. Paszota Z.: Effect of the working liquid compressibility on the picture of volumetric and mechanical losses in a high pressure displacement pump used in a hydrostatic drive. Part II Mechanical losses in a pump //International Scientific-Technical Conference Hydraulics and Pneumatics, Wrocław, 16 – 18 maja 2012 / Ośrodek Doskonalenia Kadr SIMP - Wrocław : ODK SIMP we Wrocławiu, 2012,
• 3. Paszota Z.: Effect of the working liquid compressibility on the picture of volumetric and mechanical losses in a high pressure displacement pump used in a hydrostatic drive. Part I Energy losses in a drive system, volumetric losses in a pump // Polish Maritime Research, Vol. 19, 2/2012
• 4. Paszota Z.: Effect of the working liquid compressibility on the picture of volumetric and mechanical losses in a high pressure displacement pump used in a hydrostatic drive. Part II Mechanical losses in a pump // Polish Maritime Research, Vol.19 3/2012
• 5. Paszota Z.: Theoretical and mathematical models of the torque of mechanical losses in the pump used in a hydrostatic drive. (in Polish). Chapter in the monograph: „Research, design, production and operation of hydraulic systems” (in Polish) Adam Klich, Antoni Kozieł and Edward Palczak editors. „Cylinder” Library. „Komag” Mining Mechanisation Centre, Gliwice 2011
• 6. Paszota Z.: Theoretical and mathematical models of the torque of mechanical losses in the pump used in a hydrostatic drive. (in Polish). „Napędy I sterowanie”, scientific monthly 10/2011
• 7. Paszota Z.: Theoretical and mathematical models of the torque of mechanical losses in the pump used in a hydrostatic drive. Polish Maritime Research, Vol. 18, 4/2011
• 8. Koralewski J.: Effect of the liquid viscosity on the energy characteristics of variable capacity piston pump (in Polish). Doctor dissertation (continued). Gdańsk University of Technology, Faculty of Ocean Engineering and Ship Technology
• 9. Koralewski J.: Effect of oil viscosity and compressibility on determination of volumetric losses in a variable capacity piston pump (In Polish). Paper submitted to the „Cylinder” 2013 Conference. Centrum Mechanizacji Górnictwa „Komag”, Gliwice 2013
• 10. Guillon M.: Theory and calculation of hydraulic systems (in Polish). Wydawnictwa Naukowo-Techniczne Warszawa 1967