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The gas cooled roots vacuum pump is based on the ordinary roots vacuum pump with a bypass gas cooling system. The external cooler makes the gas circulate automatically to cool the rotor and pump body. The cooling gas enters into the suction chamber of the pump from both sides of the pump body, so that the pump will not overheat due to compressed gas, so that it can operate reliably for a long time under high pressure difference and high compression ratio, but it has no effect on the pumping performance of the pump. The pump can be used alone or in series, or in series with liquid ring vacuum pump and ordinary roots vacuum pump to achieve higher vacuum degree to meet various process requirements.

Characteristic

Model	Pumping speed	Extreme pressure	Maximum allowable differential pressure	Speed	Inlet diameter	Outlet diameter	Motor power
	(L/s)	(Pa)	(Pa)	(r/min)	(mm)	(mm)	(kW)
ZJQ-150	150	1.6×104	8.5×104	2880	100	100	3~15
ZJQ-300	300	1.6×104	8.5×104	1440	150	150	4~30
ZJQ-600	600	1.6×104	8.5×104	2900	150	150	7.5~55
ZJQ-1200	1200	1.3×104	8.8×104	1460	300	300	15~132
ZJQ-2500	2500	1.3×104	8.8×104	1470	400	300	22~250
ZJQ-5000	5000	-	4×104	1480	400	300	37~250
ZJQ-10000	10000	-	4×104	1480	500	400	55~500

Note: the limit pressure listed in the table is the limit pressure value of the pump when it is used alone for direct air discharge, and the limit pressure when it is equipped with the front stage pump is the same as that of ZJ series Roots vacuum pump, which can refer to the limit pressure value of the corresponding roots vacuum unit.