DM series Roots vacuum pump

Model:DM series Roots vacuum pump (Water Cooling)

Brand:DREAM

Pumping speed: 70~5000m³/h or 19.45~1388.89L/s

Extreme Pressure:0.005mbar or 0.5pa

Motor power：1.5~37KW or 2.04~50.31hp

Model:DM series Roots vacuum pump (Air Cooling)

Brand:DREAM

Pumping speed: 150~3750m³/h or 41.67~1041.67L/s

Extreme Pressure:150mbar or 15000pa

Motor power：3~400KW or 4.08~543.85hp

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Product Features

Working principle

The Roots vacuum pump is a rotary positive displacement vacuum pump. The two three-lobe rotors keep a certain clearance with the pump chamber, and the two rotors mesh with each other and keep a certain clearance by a pair of synchronous counter-rotating high-precision gears. The right figure shows the structure of the pump, from Figure Ⅰ to Ⅳ for the rotor.

Rotating in the pump chamber and complete a suction and discharge process. The Roots vacuum pump with a three-lobe rotor has obvious technical advantages over the traditional Roots vacuum pump with a two-lobe rotor in terms of pumping efficiency, maximum permissible differential pressure, temperature rise, vibration, noise and other main performance indexes.

Advantages

Roots pumps can be used for a wide range of pressures and can achieve a large pumping speed within this range.If gas is suddenly released from the system, the Roots pump can release the gas mixture at a faster pumping rate.This feature makes Roots pumps superior to diffusion and oil-seal mechanical pumps, and can be used as booster pumps in pumping systems in Roots pump units.
Equipped with a bypass overflow valve that can be activated under atmospheric pressure, reducing the pumping time; There are gaps between rotors and between rotors and the pump chamber wall. The moving parts inside the pump have no friction and do not require lubrication. There is no oil in the pump chamber.
The rotor has a symmetrical shape, good dynamic balance, smooth motion, high-precision gearing, and low operating noise.
Compact and small footprint, usually horizontal, with vertical flow of gas in the pump cavity, which facilitates the removal of dust or condensate from the pump.
Choosing suitable rotor profiles and precise grinding can achieve high volumetric efficiency.
Low operation and maintenance costs.

Parameter

DM series water-cooled Roots parameter table

Model NO.	Pumping Speed L/s	Extreme Pressure Pa	Maximum Allowable pressure difference	Power Kw	Rotation Speed rpm	Air Input Pipe Diameter mm	Air Output Pipe Diameter mm	Weight Kg
DM-70	70	≤ 0.5	≥ 1.2*10 4	1.5	1450	100	80	165
DM-150	150	≤ 0.5	≥ 1*10 4	3	2900	100	80	165
DM-300	300	≤ 0.5	≥ 8*10 4	4	2900	160	100	275
DM-600	600	≤ 0.5	≥ 6*10 4	5.5	2900	200	160	420
DM-1200	1200	≤ 0.05	≥ 5*10 4	11	2900	250	200	980
DM-2500	2500	≤ 0.05	≥ 4*10 4	18.5	2900	320	250	1800
DM-5000	5000	≤ 0.05	≥ 3*10 4	37	1450	300	300	3580

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