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1、Liquid ring vacuum pumpsin compact designLEM 26, LEM 51VACUUM TECHNOLOGY LEM LE 2A133.71322.52.01 E 12/99Pressure range: 33 to 1013 mbarSuction volume flow: 3 to 58 m/hCONSTRUCTION TYPESIHI liquid ring vacuum pumps are displacement pumps ofuncomplicated and robust construction with the following par
2、ticularfeatures:non-polluting due to nearly isothermal compressionoil-free, as no lubrication in the working chamberhandling of nearly all gases and vapourssmall quantities of entrained liquid can be handledeasy maintenance and reliable operationlow noise and nearly free from vibrationwide choice of
3、 material, therefore applicable nearly everywhereprotection against cavitation as standardincorporated dirt drainincorporated central drainno metallic contact of the rotating partsThe SIHI liquid ring vacuum pumps LEM are single-stage ones.APPLICATIONHandling and exhausting of dry and humid gases; e
4、ntrained liquid canbe handled during normal duty. The pumps are applied in all fieldswhere a pressure of 33 to 900 mbar must be created by robustvacuum pumps.NOTEDuring operation the pump must continuously be supplied with serviceliquid, normally water, in order to eliminate the heat resulting from
5、thegas compression and to replenish the liquid ring, because part of theliquid is leaving the pump together with the gas. This liquid can beseparated from the gas in a liquid separator (see catalogue partaccessories).It is possible to reuse the service liquid. The pumps are equipped witha device by
6、which the contaminated service liquid can continuously bedrained during operation (dirt drain), if necessary.The direction of rotation is clockwise, when looking from the drive onthe pump.GENERAL TECHNICAL DATAPump type unit LEM 26 LEM 51speed 50 Hz60 Hz rpm29003500Max. compression over pressure bar
7、 0,3Max. admissible pressure difference bar 1,1Hydraulic test (over pressure) bar 3Moment of inertial of the rotatingpump parts and of the water filling kg . m 0,003 0,005Sound pressure levelat a suction pressure of 80 mbar dB (A) 68Max. gas temperature drysaturatedCC200100Service liquidmax. admissi
8、ble temperaturemax. viscositymax. densityCmm/skg/m8041200volume up to shaft level liter 0,4 0,6Max. flow resistanceof the heat exchanger bar 0,2The combination of several limiting values is not admissible.2Material designMATERIAL DESIGNItem COMPONENTS 0A 4B10.10 Casing 0.6025 1.440813.70 Guide disk
9、1.440416.10 Cover 1.440423.50 Vane wheel impeller 2.1096.01 1.451743.30 Standard mechanical seal Cr-steel / carbon / Perbunan Cr Ni Mo-steel / carbon / Viton75.11 Valve plate PTFESectional drawing LEM 26, LEM 51Fresh water requirements in m/h dependent on suction pressure, speed, mode of operation a
10、nd difference in temperaturesuction pressurembar 33 120 200 400KB KB KB KBpump speed difference intemperature C FB difference intemperature C FB difference intemperature C FB difference intemperature C FBrpm 10 5 2 10 5 2 10 5 2 10 5 2LEM 26 2900 0,04 0,07 0,14 0,39 0,05 0,09 0,16 0,36 0,05 0,09 0,1
11、5 0,3 0,05 0,08 0,14 0,283500 0,06 0,10 0,18 0,07 0,11 0,19 0,07 0,11 0,18 0,07 0,11 0,18LEM 51 2900 0,07 0,13 0,23 0,48 0,09 0,15 0,24 0,42 0,09 0,14 0,23 0,36 0,09 0,14 0,22 0,343500 0,11 0,17 0,28 0,12 0,19 0,28 0,12 0,18 0,26 0,12 0,18 0,25FB = fresh liquid serviceKB = combined liquid service wi
12、th service water 10 C, 5 C, 2 C warmer than the fresh water.3Suction volume flow and power absorption LEM 2601020304010 100 1000suction pressure2900 rpm3500 rpmm/h40 60 80 200 400 mbarLEM 2600,511,510 100 1000suction pressurekW2900 rpm3500 rpm40 60 80 200 400 mbarLEM 26The operating data are applica
13、ble under the following conditions: pumping medium: - dry air: 20C- water vapour saturated air: 20C service liquid: - water: 15CCompression pressure 1013 mbar (atmospheric pressure)The suction volume flow is applied to the suction pressureTolerance of the operating data 10%Max. fresh water need with
14、 lowest suction pressure4Suction volume flow and power absorption LEM 5102040608010 100 1000suction pressure2900 rpm3500 rpmm/h40 60 80 200 400 mbarLEM 51012310 100 1000suction pressurekW2900 rpm3500 rpm40 60 80 200 400 mbarLEM 51The operating data are applicable under the following conditions: pump
15、ing medium: - dry air: 20C- water vapour saturated air: 20C service liquid: - water: 15CCompression pressure 1013 mbar (atmospheric pressure)The suction volume flow is applied to the suction pressureTolerance of the operating data 10%Max. fresh water need with lowest suction pressure5Dimension table
16、 LEM 26electric motor IP 55 weightsize kW abt. kg50 Hz 60 HzLEM 26 80 0,75 1,1 21other motors on request* dimension dependent on the motor makeDimension table LEM 51electric motor weightsize kW m1 m2 w1 * abt. kg50 Hz 60 HzLEM 51 90 S 1,5 - 130 100 366 2790 L - 2,2 155 125 391 30other motors on request* dimension dependent on the motor makeN 1 = gas inlet G 1N 2 = gas outlet G 1uB = connection for service liquid G uc = con
