MR-HM 380 Cavitation dans les pompes Équipement didactique Établi hydraulique La description
• visualisation des effets de cavitation dans une pompe transparente
• vitesse de pompe réglable en continu
• circuit d'eau fermé One of the most common causes ofcavitation effects are fast moving objects in the water, such as the impellersof a centrifugal pump. If cavitation occurs on the impeller, the high mechanical stress sometimes results in separation or deformation of particles from thesurface. In addition to the impeller geometry, intake pressure and temperatureare also relevant for the occurrence ofcavitation. The MR-HM 380 unit can be used todemonstrate cavitation effects on impellers of centrifugal pumps. Pump housing and the pipe at the inlet side ofthe pump are made of transparentplastic in order to visualise the cavitationprocesses. It is possible to capture excellent images of the vapour bubbles bytaking photographs with short exposuretimes (flash). In order to influence the flow velocity atthe impeller blades, the speed can bechanged within a wide range via a frequency converter. Valves at the inlet andoutlet of the pump enable the flow rateand pressures to be adjusted accordingly. Pressures on the inlet and outlet sideare displayed on two manometers. Alsodisplayed are the water temperature inthe tank, flow rate and pump speed. Thewater temperature can be controlledand the tank is fitted with a heater. Thewater is cooled via the water supply. Learning objectives/experiments • formation of cavitation • observation of cavitation effect • how speed, inlet pressure, flow rateand temperature affect cavitation Specification [1] visualisation of cavitation in centrifugal pumps [2] transparent pump housing and pipe at the inlet side [3] open impeller to observe the blades during operation [4] continuously adjustable pump speed via frequencyconverter [5] temperature control via heater and external coolingvia water supply [6] flow measurement using rotameter [7] display of the pressures at inlet and outlet side ofthe pump via manometers [8] digital display of speed, water temperature in thereturn and flow rate [9] closed water circuit with tank and temperature display Technical data Centrifugal pump with drive motor • power consumption: 0,37kW • speed: 500…3300min-1 • max. flow rate: 70L/min • max. head: 13m Tank: 20L Measuring ranges • pressure (inlet): -1…0bar • pressure (outlet): 0…1,5bar • temperature: 0…100°C • flow rate: 10…140L/min 230V, 50Hz, 1 phase LxWxH: 1000x630x590mm Weight: approx. 65kg Required for operation water connection: approx. 100L/h drain Scope of delivery 1 experimental unit 1 set of hoses 1 set of instructional material
