Analiza kinematike in drsnih hitrosti aksialne batne črpalke

Kogovšek, Urška (author), Nagode, Marko (mentor), Oman, Simon (comentor)

Poznavanje delovanja različnih vrst črpalk omogoča ustrezno izbiro črpalke v industrijskih aplikacijah. Pri aksialnih batnih črpalkah nam pravilna izbira števila batov in nagiba plošče zagotavlja doseganje željenega volumskega pretoka. Poznavanje kinematike pa nam omogoča natančen popis volumskega pretoka ter ustrezno izbiro materiala in postopkov obdelave sestavnih delov črpalke za podaljšanje njene življenjske dobe. V nalogi smo obravnavali kinematiko aksialne batne črpalke brez možnosti spreminjanja kota nagiba plošče s pripadajočimi obremenitvami, ki se pojavijo med obratovanjem. Obremenitve namreč vplivajo na velikost Hertzovega tlaka v kontaktu, ki je neposredno vezan na obrabo črpalke. Kot alternativo črpalkam s konstantno iztisnino smo v nalogi obravnavali tudi spreminjanje iztisnine v odvisnosti od števila batov in nagiba plošče. Izvedbe črpalk z možnostjo nastavljanja iztisnine (v primerjavi s črpalkami s konstantno iztisnino) v proizvodnih sistemih, kjer je potrebno prilagajanje pretoka, namreč omogočajo bistvene prihranke. Analitično izpeljane enačbe smo predstavili še na računskem primeru črpalke in grafično predstavili spreminjanje iztisnine pri črpalkah, ki to omogočajo.

• Language: Slovenian
• Keywords: aksialne batne črpalke, kinematika, drsna hitrost, obremenitve, obraba, Hertzova teorija, volumski pretok
• Work type: Final paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [U. Kogovšek]
• Year: 2019
• Number of pages: XII, 33 f.
• PID: 20.500.12556/RUL-110473
• UDC: 621.651:531.1:532(043.2)
• COBISS.SI-ID: 16929307
• Publication date in RUL: 15.09.2019

Secondary language

• Language: English
• Title: Analysis of kinematics and slip speed of axial piston pump

Abstract

Knowing how different types of pumps work allows us to select a suitable pump for any industrial application. In the case of axial piston pumps selecting the right number of pistons as well as the correct swash plate angle ensures the achievement of the desired volumetric flow rate. The knowledge of kinematics allows us to accurately determine the volumetric flow rate. It also allows us to choose the right material and appropriate component processing procedures to prolong a pumps service life. In this thesis we discussed the kinematics of an axial piston pump with a fixed swash plate angle while taking into account the loads that occur during operation. These loads influence the magnitude of the Hertz contact pressure which is directly linked to the wear of the pump. As an alternative to pumps with constant displacement, we also considered changing the pumps displacement with a different number of pistons and swash plate angle. In manufacturing systems where volumetric flow rate adjustments are needed pumps with adjustable displacement designs provide significant savings in comparison to those with a constant displacement. We also presented analytically derived equations on a computational pump example and graphically presented pump displacement changes in cases where such adjustments are possible.

• Keywords: axial piston pumps, kinematics, slip speed, load, wear, Hertz theory, volumetric flow rate