LGB variable pitch dry screw vacuum pump series
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Detailed Introduction
The pump chamber of a dry, equal-pitch screw vacuum pump is divided into several unconnected chambers by the meshing main and driven rotors. Depending on their function, these chambers are divided into suction chambers ③, transport chambers ④, and exhaust chambers ⑤.
During operation, as the main rotor ① and driven rotor ② mesh and rotate, the volume of the suction chamber ③ continuously increases, continuously drawing gas from the intake port at the top of the pump body. When the main and driven rotors rotate a certain angle, the volume of the suction chamber ③ reaches its maximum and is separated from the pump intake port. This chamber then transforms into a transport chamber ④, and a new suction chamber ③ is formed. As the rotors continue to rotate, the gas in the transport chamber ④ moves towards the exhaust end at a constant volume. In actual operation, due to the backflow of gas from the exhaust end, the pressure of the gas in the transport chamber ④ continuously increases. When the rotor rotates a certain angle, the transport chamber ④ communicates with the exhaust passage. The gas in the exhaust passage violently backwashes into the chamber, causing the pressure and temperature of the gas in the chamber to increase, and producing airflow noise. This chamber then transforms into an exhaust chamber ⑤. As the rotors continue to rotate, the volume of the exhaust chamber ⑤ gradually decreases, and the gas is continuously discharged. The pump chamber of a dry screw vacuum pump is oil-free, providing clean vacuum. The pump working chamber and screw rotor surfaces have an anti-corrosion coating, allowing for use in harsh conditions. When used in explosion-proof environments, the pump requires explosion-proof configuration. The gas in the screw vacuum pump chamber is always in a uniform linear motion state, and the pump chamber is straight through, without a baffle structure, so solid dust and condensate are not easily deposited in the pump chamber. If necessary, gas is introduced into the pump chamber through a side gas injection port to form a purge airflow, enhancing the removal of solid dust and condensate from the pump chamber.
Curve Chart
Performance curve chart of LGB and other constant-pitch screw vacuum pumps
Technical Parameters
| Parameters | Model | LGB70 | LGB110 | LGB150 | LGB200A | LGB300 | LGB300A | LGB400 |
| Pumping Speed (50/60Hz) |
m³/Hr | 250/300 | 360/430 | 540/650 | 720/850 | 1080/1290 | 1080/1290 | 1440/1700 |
| L/min | 4200/5000 | 6000/7200 | 9000/10800 | 12000/14400 | 18000/21600 | 18000/21600 | 24000/28800 | |
| L/S | 70/84 | 100/120 | 150/180 | 200/240 | 300/360 | 300/360 | 400/480 | |
| Ultimate Pressure (50/60Hz) |
mbar | 0.02/0.01 | 0.5/0.25 | |||||
| Torr | 0.015/0.0075 | 0.38/0.19 | ||||||
| Pa | 2/1 | 50/25 | ||||||
| Power (KW) 50/60Hz | 5.5/7.5 | 7.5/11 | 11/15 | 15/18.5 | 22/22 | 15/18.5 | 37/45 | |
| Speed (RPM) 50/60Hz | 2900/3550 | |||||||
| Inlet Diameter (mm) | 50 | 65 | 80 | 90 | 100 | 90 | 100 | |
| Outlet Diameter (mm) | 40 | 40 | 65 | 65 | 65 | 65 | 65 | |
| Gear Chamber Oil Volume (L) | 0.85 | 0.85 | 1.4 | 2 | 2 | 2 | 2 | |
| Cooling Water Volume | L/min | 2.5 | 2.5 | 2.6 | 2.8 | 3.5 | 2.8 | 3.5 |
| Gal/min | 0.67 | 0.67 | 0.7 | 0.75 | 1.07 | 0.75 | 1.07 | |
| Weight (kg) | 295 | 350 | 480 | 520 | 680 | 520 | 520 | |
| Noise (dB(A)) | 72 | 73 | 78 | 78 | 80 | 80 | 82 | |
| Room Temperature (°C) | 5~40 | |||||||
| Maximum Allowable Humidity | 90% | |||||||
Note: (1) The oil volume listed above is for reference only, usually for fluorinated and mineral oils. The equipment is equipped with pump oil and lubricating grease oil upon leaving the factory.
(2) The above cooling water volume is based on the environmental temperature of 30℃ and the cooling water inlet temperature of 20℃. The usage will be different with circulating water, and the water pressure is 0.15~0.2MPa;
(3) LG screw vacuum pumps are equal lead screw vacuum pump series;
Keywords:
LG/LGB series dry screw vacuum pumps
Roots Vacuum Pump Series
H, 2H slide valve vacuum pump series
Liquid ring vacuum pump series
Oil-free reciprocating vacuum pump series
KT series high vacuum oil diffusion pump series
Z-series oil diffusion jet pump (oil booster pump)
Vacuum unit series
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