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Karakteristike centrifugalnih vodnih črpalk
Rotar, Tilen (Author), Mori, Mitja (Mentor) More about this mentor... This link opens in a new window

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Abstract
V zaključni nalogi smo obravnavali karakteristiko centrifugalnih vodnih črpalk na preizkuševališču FM21 ter izvedli postopek nadgradnje enote. Opazovali in opisali smo preizkuševališče in na njem izvedli meritve. Med preizkusi smo merili padec tlaka na ostrorobi merilni zaslonki, prirastek tlaka na obeh črpalkah, vrtljaje in vhodno električno moč obeh elektromotorjev ter temperaturo vode. Na podlagi meritev je program izračunal dobavno višino in volumski tok, izkoristek in ostale količine, s pomočjo katerih smo lahko zasnovali diagram karakteristik črpalk. Slednji vključuje odvisnost dobavne višine črpalk od volumskega toka vode. Preučili smo delovanje merilnikov in signalov ter s pomočjo pridobljenih podatkov zasnovali nov program za zajemanje signalov v programskem okolju LabVIEW. Zasnovani program uporablja merilno kartico za zajem signalov in ustrezne merilne skale na podlagi merilnih razponov merilnikov za pretvorbo fizikalnih veličin. Primerjali smo rezultate meritev, ki so bile opravljene s tovarniškim programom, in naše meritve, opravljene s programom LabVIEW.

Language:Slovenian
Keywords:vodne črpalke, centrifugalna črpalka, karakteristike centrifugalnih črpalk, izkoristek, dobavna višina.
Work type:Bachelor thesis/paper (mb11)
Organization:FS - Faculty of Mechanical Engineering
Year:2018
Views:668
Downloads:653
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Secondary language

Language:English
Title:Operational characteristics of centrifugal pumps
Abstract:
In this thesis we discussed the characteristics of centrifugal water pumps of the testbed FM21 and we upgraded the measuring equipment and data aquisition system. We observed and described the centrifugal pumps testbed and used it for measurements. We measured the pressure drop through the orifice, pressure rise through both pumps, rotational speed of pumps, electrical power of pumps and the temperature of water. From the results of the measurements the program calculated the total head, the volume flow, the efficiency of pumps and other relevant quantities. Using these quantities we were able to design characteristic diagrams of pumps. The characteristics diagrams use total head versus flow rate. We studied the operation of the centrifugal pumps testbed sensors and signals. Using the information, we designed a new program in LabVIEW environment. The program uses a measuring card to capture the signals and custom measuring scales to transform the captured signals correctly into physical quantities. We compared the results of measurements done with factory software and results of our measurements captured designed in LabVIEW environment.

Keywords:water pumps, centrifugal pumps, characteristics of centrifugal pumps, efficiency, total head.

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