Roots Pump
Roots Pump
Roots pumps extend the range of applications for so-called backing pumps to lower pressures, especially in applications with high gas loads. Their main working range is between 1 mbar and 1 × 10-3 mbar. By connecting several of such pumps in series even lower working pressures down to 1 × 10-4 mbar can be achieved.
Roots pumps are positive displacement pumps without internal compression. This generally means, that they are not able to compress to atmosphere directly. Running in combination with a corresponding backing pump will always work. When selecting a combination of backing pump and roots pump, the ratio of the pumping speeds of the two pumps is decisive. This is referred to as gradation. Typical gradations are between 1:2 and 1:8. This means that Roots pumps typically have a pumping speed 2 to 8 times higher than that of the attached backing pump. The gradation determines the pressure difference between the inlet and outlet of the roots pump at the respective operating point.
Customer’s Benefit :-
- (1) Large pumping speed range from 250 to 12,000 m3/h.
- (2) Very high continuous pressure differences.
- (3) Flexibility and adaptation to the process can be achieved by configuring the motor power and the frequency converter.
- (4) Thermal process gas control with OktaLine G and gas coolers.
- (5) Low maintenance, maximum operational reliability and availability due to magnetic coupling (optional).
- (6) Chemical and process engineering.
- (7) Coating and semiconductor industry.
- (8) Research & development.
- Strong rotary shaft. → Enables start-up and continuous operation in low vacuum.
- Optimal motor capacity can be selected to fit the specific load. → Less equipment cost, less operation cost.
- Wide range of pump speed lineup. → 90～12,000m3/h
- Work with various backing pumps. → Roots＋oil-sealed rotary, liquid-ring
Applications :-
- Semiconductor, Electronics Industry.
- Nuclear Energy Development Research.
- Automobile, Machinery, Aircraft Industry.
- Science & Engineering.
- Heavy Electrical Equipment.
- Optical Industry.
- Steel, metal industry.
- Chemistry, Pharmaceutical industry.
- Food Industry.
- Metalworking Industry.
- Energy connection.
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Technical Data
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WA/WAU 251
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WA/WAU(H) 501
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WA/WAU 1001
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WA/WAU(H)2001
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|---|---|---|---|---|---|
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|
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50 Hz
|
50 Hz
|
50 Hz
|
50 Hz
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Nominal pumping speed 1)
|
m³/h (cfm)
|
253.0 (149.0)
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253.0 (149.0)
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1000 (589)
|
2050 (1207.5)
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|
Max. effective pumping
speed with backing pump |
m³/h (cfm)
|
210.0 (123.7)
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410.0 (241.0)
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800 (470) SV 300 B
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1850 (1089) SV 630 BF
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|
|
TRIVAC
|
D 65 B
|
-
|
-
|
|
|
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SOGEVAC
|
SV 200
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-
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||
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Ultimate total pressure 2)
|
mbar (Torr)
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< 8 x 10⁻⁴ (< 6 x 10⁻⁴)
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< 4 x 10⁻² (< 3 x 10⁻²)
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< 4 x 10² (< 3 x 10²)
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|
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Max. permissible pressure
difference during continuous operation 3) |
mbar (Torr)
|
80 (60.0)
|
80 (60.0)
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50.0 (37.5)
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|
|
Leak rate, integral
|
mbar x l/s
|
< 5 x 10-4
|
< 5 · 10^4
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||
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Mains supply
|
V
|
200-240
|
200-240
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||
|
V
|
380-400
|
380-400
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|||
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Thermal class
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|
F
|
F
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||
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Permissible ambient
temperatures |
°C (°F)
|
+5 to +40 (+ 41 to +104)
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5 to +40 (+ 41 to +104)
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||
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Motor power
|
kW (hp)
|
1.1 (1.5)
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2.2 (3.0)
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4.0 (5.4)
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7.5 (10.0)
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Energy efficiency class
|
|
|
IE 3
|
IE 3
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|
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Nominal speed, approx.
|
rpm
|
3000
|
3000
|
3000
|
3000
|
|
Max. permissible speed
|
rpm
|
3600
|
3600
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||
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Type of protection
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IP
|
55
|
55
|
||
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ATEX protection category 4)
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|
Category 3i
|
Category 3i
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Category 3i
|
Category 3i
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Lubricant for the bearing
chamber) vertical pumping action, approx. |
I (qt)
|
0.6 (0.63)
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0.8 (0.85)
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1.8 (1.90)
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3.6 (3.81)
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|
Lubricant for the bearing
chamber) horizontal pumping action, approx. |
I (qt)
|
0.45 (0.48)
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0.7 (0.74)
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1.6 (1.69)
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2.4 (2.54)
|
|
Lubricant of the shaft
sealing ring housing |
I (qt)
|
0.6 (0.63)
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1.0 (1.06)
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1.3 (1.37)
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1.6 (1.69)
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|
Connection flanges
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DN
|
63 ISO-K
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100 ISO-K
|
160 ISO-K
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|
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Materials (materials in
contact with the gas) |
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C steel, CrNi steel, grey cast iron, FPM (FKM)
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C-Stahl, CrNi-Stahl, Grauguss, FPM
|
||
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Weight WA / WAU
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kg (lbs)
|
85.0 / 89.0 (187.4 / 196.2)
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128.0 / 133.0 (187.4 / 196.2)
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220 / 225 (485.1 / 496.1)
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400 / 406 (882.0 / 895.2)
|
|
Noise level 6)
|
dB(A)
|
< 62
|
< 65
|
< 70
|
< 72
|
|
Technical Data
|
|
WH/WHU 2500(50 Hz)
|
WH/WHU 4400
|
WH/WHU 7000
|
|---|---|---|---|---|
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Nominal pumping speed 2)
|
m³/h (cfm)
|
2500 (1473)
|
4400 (2592)
|
7000 (4123)
|
|
Max. effective pumping speed
with backing pump DRYVAC DV 650 |
m³/h (cfm)
|
2200 (1296)
|
3300 (1944)
|
4700 (2768)
|
|
Max. permissible pressure
difference during continuous operation (WH) |
mbar (Torr)
|
50 to 75 (37.5 to 56.3)
|
30 to 45 (22.5 to 33.75)
|
0 to 30 (15.0 to 22.5)
|
|
Max. permissible pressure
difference for short-cycle operation < 2 min. (WHU) |
mbar (Torr)
|
160 (120)
|
120 (90)
|
60 (45)
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|
Leak rate, integral
|
mbar x l/s
|
< 1 x 10^5
|
< 1 x 10⁻⁵
|
|
|
(Mains voltage) FC operation
|
V
|
340 to 530
|
340 to 530
|
340 to 530
|
|
180 to 260
|
180 to 260
|
180 to 260
|
||
|
(Mains voltage) Mains operation
|
V
|
360 to 440
|
360 to 440
|
360 to 440
|
|
Permissible ambient
temperatures |
°C (°F)
|
180 to 220
|
180 to 220
|
180 to 220
|
|
Nominal power rating
FC operation (WH) |
kW (hp)
|
11.0 (14.8)
|
+5 to +40 (+41 to +104)
|
|
|
(Mains operation) WH
|
kW (hp)
|
6.2 (8.4)
|
11.0 / 14.75
|
11.0 / 14.76
|
|
(Mains operation) WHU
|
kW (hp)
|
6.2 (8.4)
|
11.0 / 14.75
|
11.0 / 14.76
|
|
Idle mode power consumption
|
kW (hp)
|
1.1 (1.5)
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kW (hp) 0.7 (1.0)
|
0.9 (1.2)
|
|
Energy efficiency class
|
|
IE 2
|
IE 2
|
|
|
Nominal speed
|
rpm
|
3000
|
3000
|
6000
|
|
Max. permissible speed with FC 6)
|
rpm
|
6000
|
4800
|
4200
|
|
Type of protection (int. FC/ext. FC)
|
IP
|
54/55
|
54
|
|
|
Cooling water connection (2 pcs.)
|
G
|
1/4", female
|
1/4", female
|
|
|
Cooling water quantity 7)
|
l/min
|
1 to 3
|
1 to 3
|
|
|
Cooling water admission temperature
|
°C (°F)
|
5 to 35 (+41 to +95)
|
5 to 35 (+41 to +95)
|
|
|
Permissible cooling water pressure
|
bar
|
2 to 6
|
2 to 6
|
|
|
Lubricant 8)
|
l (qt)
|
1.2 (1.27)
|
4.75 (5.0)
|
|
|
Inlet Connection flange
|
ISO-K
|
250
|
250
|
|
|
Outlet Connection flange
|
ISO-K
|
100
|
160
|
|
|
Weight WH/ WHU
|
kg (lbs)
|
390/410 (861/905)
|
590 (1301)
|
|
|
Weight WH with integrated FC
|
kg (lbs)
|
430 (946)
|
620 (1369)
|
|
|
Dimension (W x B x H) WH/ WHU
|
mm (in.)
|
1015 x 428 x 354 (39.96 x 16.85 x 13.94)
|
1183 x 540 x 415
|
|
|
Dimension (W x B x H) WH with integrated FC
|
mm (in.)
|
(42.36 x 22.44 x 13.94)
|
(46.57 x 21.26 x 16.34)
|
|
|
Noise level 9)
|
dB(A)
|
< 63
|
< 63
|
|