KN Series oil diffusion pump

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Description: The pumps in the KN series are high-vacuum pumps. They are always operated in conjunction with forevacuum pumps.Acquiescent flange is CF standard with bolted type.
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KN series are the equipment mainly used for getting the high vacuum condition (10-1 – 10-5 Pa); the pumping capacity is big, the pumping speed can be changed range from 3100L/s to 110000L/s, it adds observation windows, oil inlet and outlet, the protection device of controlling pump oil overheat, the alarm device of controlling cooling water overheat, and parallel combination of many heating rods insert into the pump, the rods can be replaced without shutting down the machine, so heat time is short, Oil vapor back-streaming volume is low, without external water cooling baffle,when using the common pump oil, the volume is 1*10-3mg/㎡min , when using 275 silicon oil it will be 1* 10-4mg/㎡min, excellent ultimate vacuum, less than 10-6kpa.

The pumps adopt stretching process, reduces weld crack and out gassing and increases strength.

It is widely used in vacuum coating, vacuum furnace, electron, aviation, aerospace hi-tech field.

Technical Data

Item unit KN-250 KN-320 KN-400 KN-500
Ultimate pressure Pa 5×10-5
Capacity L/s 3100 4600 7500 11000
Fore pump pressure Pa 40
Back-flow rate mg/(cm2·min) ≤3×10-2
Heating time min ≤20
Heating power kw 2.2-2.4 3.5-3.8 6 7.2-8
Voltage V 220 380
Oil Model / KS-3
Oil volume L 1.2-1.5 1.6-1.8 3-4 5-6
Cooling water consumption L/h 350 420 500 600
Inlet diam mm 180 320 400 500
Outlet diam mm 63 63 63 100
Fore pump speed L/s 8-15 15-30 30-70 70-150


Outline dimensions

L   mm 475 590 760 900
B  mm 460 540 720 810
H  mm 560 672 785 940
Net weight kg 50 70 95 258

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