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        LGB Screw Vacuum Pump

        Screw vacuum pump working principle diagram


        LGB type screw vacuum pump using range

        LGB type screw vacuum pump, is the use of a pair of screw, made in the pump shell synchronous high-speed reverse rotation of the effects of the suction and exhaust and suction device, because the screw and has a certain gap between the screw, so the pump work, there is no friction between each other, smooth running, low noise, working cavity without lubricating oil, therefore, can dry screw pump pumping gas containing water vapor and a small amount of dust; Due to the limit of LGB type screw vacuum pump pressure can reach 5 pa, so type LGB screw vacuum pump can be widely used in chemical industry, metallurgy, electronics, petroleum, aerospace, tools, paper, packaging, food, medicine, medical apparatus and instruments, and information engineering, biological engineering, microelectronics and other fields.


        LGB type screw vacuum pump performance characteristics

        1. The working chamber without any medium, can clean vacuum;

        2. Through the high precision dynamic balancing, high-speed operation, no friction between rotating parts, and long service life;

        3. The gas inside the pump is compressed, appropriate extraction can non-condensable gas;

        4. A single pump work scope is big, you can draw from the atmosphere to below 100 pa;

        5. Working cavity and the rotor of the screw surface can be anti-corrosion treatment, so as to adapt to bad working condition;

        6. Compared with mechanical vacuum pump oil seal type, condensable sexual material won't be stuck inside the pump, free of oil and gas and oil mist emissions, environmental preferred;

        7. Compared with liquid ring pump, need only, the application of recycled cooling water is pumped gas does not contact with water, avoid the influence of water temperature of vacuum, materials easy to recycle, can save link of sewage disposal, and lower limit pressure, composition of screw vacuum unit roots for more efficient.



        Model and main technical parameters


        Screw vacuum pump model

        The extraction rate (50 hz)Litres per second (L/s)70100200300
        M cubic/hour after (m3/h2503607201080
        Extreme pressure (50 hz)Palmer (Pa)≤5≤5≤5≤5
        The maximum exhaust pressureKPa (kPa)120120120120
        Motor power (50 hz)Kilowatts (kW)7.51518.537
        speedRevolutions per minute (RPM)2900288028802880
        The connectionInlet diameterMm (mm)5080100125
        Exhaust diameterMm (mm)45656580
        lubricantBefore the end cover gear oilL (L)
        The cooling watertrafficLitres/minute (L/min)30-3530-3530-3530-35
        pressureMPa (MPa)0.15-0.250.15-0.250.15-0.250.15-0.25
        The water temperatureDegrees Celsius (℃)≤25≤25≤25≤25
        The highest design temperatureAir intakeDegrees Celsius (℃)≤50≤50≤50≤50
        exhaustDegrees Celsius (℃)150150150150
        Lubricating oilDegrees Celsius (℃)50505050
        Seal typeThe air inlet end
        Oil sealOil sealOil sealOil seal
        Exhaust side
        Mechanical seal + oil sealMechanical seal + oil sealMechanical seal + oil sealMechanical seal + oil seal
        Shaft extension place
        Mechanical sealMechanical sealMechanical sealMechanical seal
        Room temperature operating rangeDegrees Celsius (℃)5-405-405-405-40
        The noiseDecibels (dB)≤80≤80≤80≤80
        Weight (not including silencer)Dry grams (kg)50066510201300
        Shape (single pump)Length X width X heightMm (mm)1360X500X6951650x475X6801740x570x7402100x800x790
        Appearance (including muffler, inlet ball valve)Length X width X heightMm (mm)1360X960X7001650x847X9331740x960x9802100×1100X1030

        Note: the technical parameters listed in the table are obtained from measurement, the following provisions conditions

        Atmospheric pressure 1.01 X105Pa/cooling water temperature 15 ℃ / humidity of the air inhaled air temperature 20 ℃ / 70% extraction rate deviation plus or minus 10% of pump type LGB - A meaning; LGB A screw straight league vacuum pump (L said screw, G dry vacuum pump, varying pitch) B A L/S extraction rate


        Structure diagram

        1. After the end cover2. Deep groove ball bearings3. The oil seal4. After the bearing seat

        5. The active rotor6. The pump body7. The skeleton oil seal8. Sealing Ring

        9. Sealing Ring 210. Before The Active Positioning Plate11. Seal FIG. 312. The Static Ring

        13. A Mechanical Seal14. The Front End Cover15. The Gear16. Locking

        17. Sealing Ring Four18. The Front Cover19. Sealing Ring Five20. Coupling

        21. The Motor22. The Machine Seal Gland23. The Mechanical Seal24. The Oil Pan

        25. The Front Bearing Cover26. The angular contact ball bearings27. The bearing inner and outer ring28.  Bearing washer

        29. The front bearing30. 30. Machine shaft sleeve31. The former passive positioning plate32. Oil seal shaft sleeve

        33. Driven rotor34. After positioning plate35. The seal ring36. After bearing inner ring

        37. Round nut38. The sealing ring of six39. After the bearing cover