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    WUXI CITY SIFANG VACUUM EQUIPMENT CO.,LTD.
    WEB:http://www.jessicakmiec.com
    E-MAIL:sfpumps@163.com
    TEL:0510-85990421 85990035
    FAX:0510-85993842
    ADD:No.48 Changkang Road, Mashan, Binhu District, Wuxi
     
    Products
    Contents brief introduction
    ZJ series

    Instruction of the principle of roots vacuum pumps

            

     Roots vacuum pump (referred to as roots pump for short) is a non-internal compression type rotary positive displacement pump, which achieves suction and exhaust by two 8-shape rotors rotating in the pump shell. Its principle is similar with roots blower. As it works within the low pressure range, the free paths of the gas molecules are long, and the resistance is strong for gas to pass through small gaps, thus, it is able to obtain a higher compression ratio, and can be used as a booster vacuum pump; but it can not directly exhaust the gas into the atmosphere alone, and it shall be connected with a fore vacuum pump in series, and exhaust the pumped gas into the atmosphere through the fore vacuum pump.

    The characteristics of the roots pump include: 1. There is a certain gas between the rotor and pump chamber, and between rotors. They do not contact with each other, and do not need oil lubrication. 2. Rotor has a good geometric symmetry, and can improve the rotary speed so as to produce a compact large pumping rate pump. 3. Pump works with small vibration and large capacity, and the capacity utilization factor is around 0.5. 4. In the pump chamber, there is no compression as the mechanical vacuum pump does, so it does not require an exhaust valve. For this reason, it can be used to pump the condensable vapors. 5. It starts fast, and can achieve the ultimate vacuum in a short period. It has low power and low maintenance cost for operation. 6. Roots pump owns a high pumping rate in a wide range of pressures (1000Pa ~ 1Pa). It is able to quickly exhaust the gases which are suddenly released of gas, and cover the shortage of low pumping rate of the diffusion pump and oil sealed mechanical pump under the pressure of (1000Pa ~ 1Pa). As a result, it is most suitable used as a booster pump.Roots vacuum pump is widely used for in vacuum degassing, vacuum melting, vacuum treatment of molten steel in the metallurgical industry, pumping non-corrosive gases in the space simulation facility, low density wind tunnel device and other facilities, as well as distillation,  vaporation, drying, and so the production processes in chemical industry, food, medicine, electrical manufacturing and other industries.
    While running, the pumped gas enters between the rotor and pump body from the air inlet. At this time, one rotor and the pump body separate the gas from the air inlet. The insolated gas (shown as the hatching part in the figure) is transferred to the air outlet during the continuous rotation of the rotor. The space is in a closed state; therefore, there is no compression and expansion. However, when the peak of the rotor reach the edge of the air outlet, since the pressure of part V is lower than that around the air outlet, in order to make the pressures in the jointed capacities even, the gas will spread from the air outlet to the district V, and the direction is opposite to the rotary direction of the rotor. When the rotor rotates again, the gas at part V is compressed and then be exhausted form the air outlet. At this time the jointed part of the other side of the rotor and the air inlet sucks gas, and when the rotor constantly rotating, repeat the above process of suction, and continuously exhaust the incoming gases. Such process is equivalent to that rotor space increases from a certain minimum  alue to the maximum  alue, and declines from the maximum  alue to the minimum   alue. This is action principle of the capacity of the roots vacuum pump.
    When the roots pump working under a very low inlet pressure, due to the high rotor speed, the linear velocity on the surface of the rotor is close to the thermal motion velocity of molecules. At this time, the gas molecules which in a collision on the rotor are pushed to the air outlet with higher pressure by the rotor, and then exhausted by the fore vacuum pump. This is the action principle of the molecules of the roots vacuum pump.

    Range of use


    ZJ series roots vacuum pump is a kind of rotary positive displacement pump, which must be used with a fore pump. It has a higher pumping rate in a wider pressure range, and not sensitive to the pumped gases which contain dust or water vapor. Therefore, it is widely used in the metallurgy, chemical industry, food, electronic coating and other industries.

    Performances and specifications



    Model


    (L/S) Pumping
    Speed

    ≤(Pa) Ultimate
    Pressure

    (rpm) Rotational
    Speed

    (Kw) Motor
    Power

    (mm)
    Diameter

    (Kg) Weight


    Recommended Model
    of Backing Pump

    進 口
    Inlet

    出 口Outlet

    ZJ-30

    30

    5×10-2

    2825

    0.75

    50

    40

    76

    2X-4A

    ZJ-70

    70

    5×10-2

    2840

    1.5

    80

    50

    96

    2X-8A

    ZJ-150A

    150

    5×10-2

    2880

    3

    100

    100

    200

    2X-15

    ZJ-300

    300

    5×10-2

    1440

    4

    150

    150

    505

    2X-30A

    ZJ-600

    600

    5×10-2

    2800

    7.5

    150

    150

    520

    2X-70A

    ZJ-1200A

    1200

    5×10-2

    1450

    11

    300

    300

    1550

    2X-70A二臺

    ZJ-2500

    2500

    5×10-2

    2880

    18.5

    300

    300

    1600

    ZJ-600
    2X-70A二臺

     

    ZJ-30/70 Type


    Installing dimension drawing


    Type 

    L

    L1 

    L2

    L3

    L4

    D

    Da

    Db

    M

    D1

    Da1

    Db1

    M1

    ZJ-30

    650

    180

    85

    270

    300

    Φ50

    Φ90

    Φ110

    M8

    Φ40

    Φ70

    Φ85

    M6

    ZJ-70

    770

    220

    115

    330

    360

    Φ80

    Φ125

    Φ145

    M8

    Φ50

    Φ90

    Φ110

    M8

    ZJ-150A/300/600/1200A Type


    Installing dimension drawing


     

    Type 

    L

    L1

    A

    B

    C

    E

    F

    G

    I

    H

    H1

    Φ

    G1

    G2

    D

    Da

    Db

    M

    N

    ZJ-150A

    1060

    320

    72

    144

    190

    462

    210

    328

    164

    380

    100

    Φ15

    G1/4″

    G1/4″

    Φ100

    Φ145

    Φ170

    M10

    4

    ZJ-300

    1330

    478

    110

    220

    300

    556

    255

    450

    225

    505

    130

    Φ21

    G1/2″

    G1/2″

    Φ150

    Φ195

    Φ220

    M10

    8

    ZJ-600

    1410

    ZJ-1200A

    1710

    563

    200

    400

    460

    1070

    500

    800

    400

    850

    260

    Φ28

    G1/4″

    G1/2″

    Φ300

    Φ395

    Φ435

    M16

    12

    ZJ-2500

    1855

    Characteristic curve


     
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    Add:No.48 Changkang Road, Mashan, Binhu District, Wuxi Tel:0510-85990421 85990035
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