Roots vacuum pumps ,which are also called Roots blowers,are rotary plunger type pumps where two symmetrically shaped impellors rotate in opposite directions inside the pump housing.

Characteristics:

The use of oil-free intermediate seal, multiple sealed way to ensure the high clean vacuum environment in the rotor chamber.
Advanced proceesing to ensure the good geometrical symmetry of the rotors,as well as low noise and long service life.
Special shaft seal is used to achieve the long stable running without oil leakage.
The BSJ-L series is made of all-aluminum alloy, heat sink, corrosion resistance, and efficient energy saving.The BSJ-LC series is made of cast iron. The unique liquid coupling method enables the pump to start directly under the atmosphere, which greatly reduces the time of pumping.
Compact structure, light weight, and small volume.

Technical Parameter :

Model		Units	BSJ70L
Pumping Rate	50 Hz	m³h^-1 / Lmin^-1	280/4670
	60 Hz		330/55000
Max Inlet Pressure	50Hz	Pa	1.2x10³
	60Hz	Pa	9.3x10²
Ultimate Vacuum		Pa	4×10^-1
Motor Power		kW(hp)	0.75 (1)
Inlet		--	VG80
Outlet		--	VF80
Cooling Method		Water cooled
Oil Need		L	0.8
Ambient Temp.		℃	5~40
Vacuum Pump Oil		--	BSO-46

Note: The value of 'Ultimate Pressure' in this sheet is measured by Pirani gauge when the Baosi special pump oil is used,and the value should be 4x10^-3 if the Mcleod gauge is used.

The cooling water temperature of inlet port must be 5~30℃ When the temperature is too low, keep it in an environment that is not easy to condense.

Performance Curve:

Dimensions:

Applications

Vacuum distillation
Vacuum packaging
Thin film coating
Freez drying
Electrical engineering
Printing
Surface treatment technique
Wind Energy
Ceramics and glasses

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