Razvoj nizkotlačnega recipročnega hidravličnega sistema

Ljoki, Alen (avtor), Majdič, Franc (mentor)

V magistrski nalogi je opisan postopek od začetne faze projekta, projektnih zahtev do delujočega prototipa. Potrebno je bilo razviti nizkotlačni recipročni hidravlični sistem, ki bo deloval pri tlakih do 1 MPa, pri pretoku 5 l/min in frekvenci preklapljanja 10 Hz. V prvem delu naloge je predstavljeno stanje tehnike in začetki razvoja hidravličnega sistema za kontrolirano recipročno gibanje kapljevine. Ovrednoteni so koncepti, ki so bili kasneje bolj podrobno analizirani. V nadaljevanju so predstavljeni izdelani prototipi. Na končnem prototipu so bile opravljene meritve in analiza padca v odvisnosti od pretoka. Pri meritvah smo izmerili padec tlaka med priključkoma P in A 0,072 MPa, med priključkoma P in B pa 0,131 MPa. Izračunani padec tlaka med priključkoma P in A 0,38 MPa ter med priključkoma P in B 0,44 MPa. Zaradi odstopanja meritev in izračunanih rezultatov smo ponovno izdelali numerično analizo po metodi CFD za ugotovitev, koliko se je bat dejansko odmaknil od sredinske lege. Ugotovili smo, da je bil problem v hidravličnem batu, ker se je odmaknil za 1,5 mm, namesto 3 mm. Na koncu so podane še smernice za nadaljnji razvoj.

• Jezik: Slovenski jezik
• Ključne besede: hidravlični sistemi, hidravlične črpalke, hladilni sistemi, voda, aktivna magnetna regeneracija, magnetokalorika, trdnostne analize, izračun padca tlaka
• Vrsta gradiva: Magistrsko delo/naloga
• Organizacija: FS - Fakulteta za strojništvo
• Leto izida: 2017
• PID: 20.500.12556/RUL-92945
• Datum objave v RUL: 11.07.2017

Sekundarni jezik

• Jezik: Angleški jezik
• Naslov: Development of the low-pressure reciprocating hydraulic system

Izvleček

In the Master's thesis is presented the process from the initial stage of the project, from the design requirements to the working prototype. During the project duration it was necessary to develop low-pressure reciprocating hydraulic system, which will sustain pressures up to 1 MPa, flow 5 l/min and be able to change direction of fluid at frequency 10 Hz. The first part presents the state of the art and the beginning of the development of the hydraulic system for hydraulic fluid flow control in the desired direction. Evaluated concepts were later analysed in details. In continuation of the thesis are presented working prototypes. On the final prototype measurements and analysis of the fluid pressure drops were made. We measured pressure drop between ports P and A 0,072 MPa and between ports P and B 0,131 MPa. The calculated pressure drop between ports P and A was 0,38 MPa and between ports P and B 0,44 MPa. As a result of the large deviation measured and calculated data, we made another CFD numerical analysis, to determine the distance hydraulic piston made during operation. We have determined that the problem was in the hydraulic piston, which moved only for 1,5 mm from centreline instead of 3 mm as expected. At the end of the thesis we presented guidelines for further development.

• Ključne besede: Hydraulic Systems, Hydraulic Pumps, Cooling Systems, Water, Active Magnetic Regeneration Magnetocaloric, Strength Analysis, Analysis of the pressure drop