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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.
| RUVAC WA / WAU 251 |
RUVAC WA / WAU 501 |
RUVAC WA / WAU 1001 |
RUVAC WA / WAU 2001 |
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| Nominal Pumping Speed (50 Hz) | m3 x h-1 | 253 | 505 | 1000 | 2050 |
| Rotational Speed (50 / 60 Hz) | min - 1 | 3000 / 3600 | 3000 / 3600 | 3000 / 3600 | 3000 / 3600 |
| Motor Power | kW | ≤ 1.1 | ≤ 2.2 | ≤ 4.0 | ≤ 7.5 |
| Max Permissible Pressure Difference | mbar | 80 | 80 | 80 | 50 |
| Connection Flanges | DN 63 PN 6 | DN 63 PN 6 | DN 100 PN 6 | DN 160 PN 6 |
| Model | RD1500 | RD1510 | RD2500 | RD2510 | ||||
| Inlet Flange | 80A JISB2290VF | 100A JIS10KFF | 100A JIS10KFF | 100A JIS10KFF | 200A JIS10KFF | |||
| Nominal Volume Flow Rate*1(m3/h) | 50 Hz | 250 | 500 | 1000 | 1350 | 2070 | ||
| 60 Hz | 300 | 600 | 1200 | 1630 | 2500 | |||
| Allowable Pressure Difference (kPa) [When Using a Standard Motor] |
50 Hz | 9.3 | 9.3 | 5.3 | 7.0 | 19 | 4.5 | 19 |
| 60 Hz | 8 | 8 | 4.7 | 7.0 | 16 | 4.5 | 15 | |
| Base Pressure (Pa) | Back Pump Single - Stage RP |
7 x 10-2 | 7 x 10-2 | 7 x 10-2 | 7 x 10-2 | 7 x 10-2 | ||
| Back Pump 2 - Stage RP |
1.3 x 10-2 | 1.3 x 10-2 | 1.3 x 10-2 | 1.3 x 10-2 | 1.3 x 10-2 | |||
| Volume Flow Rate Of Standard Backing Pump (m3/h) | 36～100 | 90～220 | 180～220 | 220～450 | 450～600 | |||
| Rotation Speed (r/min) | 50 Hz | 3000 | 1500 | 3000 | 1500 | 1500 | ||
| 60 Hz | 3600 | 1800 | 3600 | 1800 | 1800 | |||
| Standard Motor Output (kW) | 1.5 | 2.2 | 3.7 | 5.5 | 11 | 5.5 | 15 | |
| Oil Capacity (L) | 0.9 | 2.7 | 2.7 | 4.0 | 6.2 | |||
| Cooling Water Consuption*2(m3/h) | Air Cooling | 0.4 | 0.4 | 0.4 | 0.4 | |||
| Weight (kg) | With Totally Enclosed Fan Cooling Motor |
110 | 260 | 280 | 530 | 570 | 690 | 750 |
| Without Motor | 80 | 220 | 230 | 460 | 620 | |||