The Roots vacuum pump is also known as the mechanical booster which is a positive displacement type pump. It is one of the special pumps which can reach middle, high vacuum range. Its work principle is similar to the Root fan. Both of them used a pair of rotors, whose shape looks like 8, to achieve the suction and discharge process“Please refer to Work Principle of the Roots Pump.”
According to the techniques that the plenty of vapor and solvent is required to pump in the mechanical, pharmacy areas, we have improved the seal type of the bearing housing and gear box of the ZJ series Roots pump to reduce the emulsification of the pump oil efficiently and make the Roots pump more suitable to assemble with the water ring vacuum pump to suction more vapor and solvent.
For pumping of rubber has strong corrosive solvent conditions, we in the pump cavity and the bearing cavity around and shaft extension end at a total of five design of mechanical seal structure, referred to as "five mechanical seal", the mechanical seal of the flexible seal with the resistance to corrosion of the PTFE which completely eliminate the phenomenon of pump oil emulsion and completely closed the pump oil from diffusing into the pump cavity of the channel, so "five mechanical seal structure of the roots vacuum pump can be said is the true meaning of dry roots vacuum pump. If you want to use" five mechanical seal "the roots vacuum pump, please specify when ordering.
Main Characteristics of the Roots pump
.It has larger suction capacity in the wider pressure range（1~1×104Pa）
.There is no oil in the pump chamber, so the pollution of the oil vapor is avoided.
.It has less liberation and lower noise.
.It has less mechanical attrition and drive power.
.It is easy to repair and maintenance, so it has lower maintenance charges and longer usage life.
. It can pump the coagulated gases
.It cannot be used separately, a fore pump is needed. Under the atmosphere, it is not allowed to start directly until the inlet pressure reaches the definite pressure that obtained by the fore pump. The water ring vacuum pump, the oil ring vacuum pump and oil seal mechanical pump can be used as the fore pump.
The Main Characteristics of the Bozhong Roots pumps
.The seal structure is improved.
The bearing housing of the Roots pump is normally cooled and lubricated by the lubricant. If the emulsification of the oil occurs, the oil must be replaced with new oil immediately. Otherwise, the rust of the bearings will lead to liberation and larger noise of the pump. At the moment, if the wearable bearings are not replaced at once,it will lead to the abrasion of the gear and then the damage of the pump.
According to the oil emulsification of the Roots pump occurs when it pumps the much vapor and solvent with the water ring vacuum pump, our company improved the seal structure of the pump chamber. We add flexible seals made from FPM or PTFE material between the chamber and bearing housing to avoid the oil emulsification sufficiently. The seal structure has been validated by many years practice.
.The surface of the chamber of the pump is nickeled.
The rust of the surface of the rotors and chamber occurring easily when the Roots pump takes out the much vapor and solvent or the pump stops for several days. The rust can lead to the abrasion of the pump or the pump will be jammed.
To avoid the above phenomena, our company nickeled all the surface of the rotors and inner chamber of the pump. After nickeling the parts, the wearable and corrosive-proof capacity of the Roots pump is improved much.
.The shape line of the rotors
The mesh clearance between the rotors is the most important factor which influences the performance of the Roots pump. On the premise that the Roots pump runs steadily, the mesh clearance must be uniformity and least. Because a definite windage between the theoretic and the practice shape line of the Roots pump exist,our engineers revised it many times. Finally, the uniform shape line is achieved. By comparing with the abroad products, the performance of our Roots pump is also the same as them.
.All the casts are founded by the metal model and the resin sands. The surface is very smooth and can be spray-painted directly. So the heat can be given out sufficiently.
.The bearings are all adopted the import products with brand NSK, so the running stability and long life of the Roots pump can be ensured sufficiently.
.All the adopted gears are in their high qualities with at least 6 grade according to the international standard. All the gears are quenched with high frequency and the teeth are machined by the gear milling so that the pump runs steadily and with lower noise.
.The surface of the pump is all spray-painted by the epoxy paint with high quality, which is able to bear the acid, alkali, and high temperature. So the surface won't turn color for a long time.
Photos of the spare parts：
Main technical parameters of the Roots pump
Note: The data of the limited vacuum listed in the above table are obtained when the Roots pump assembles with the proper rotary vacuum pump or slide valve vacuum pump.
If the water ring vacuum pump or the oil ring vacuum pump as the fore pump, the limited vacuum will higher than these data. Please refer to the information of the Roots Liquid Ring Vacuum Units.The roots of liquid ring vacuum unit.
Overall dimensions of ZJ30/ZJ70 Roots Vacuum Pump
Overall dimensions of ZJ150-ZJ10000 Roots Vacuum Pump
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