V-DTE 3/6/8/10 Vacuum Pump Repair

  Small dry-running rotary vane compressors with volume flow from 3.5 to 12 m3/hr and overpressure up to 1 bar. Compact design, easy installation, very low noise level, corrosion-proof rotors. Hose connectors, inlet silencer and pressure relief valve as standard. Motor complies with DIN EN 60034 and has IP 54 protection and F-class insulation.

Operating Principle of Dry-Running Rotary Vane Vacuum Pumps

Increasing pressure by reducing volume is the principle of rotary vane operation. This design performs excellently in pressure, vacuum or a combination of both.

In a cylindrical housing, the rotor is eccentrically positioned so that its top almost touches the cylinder. The so-called rotor blades or vanes sit in slots in the rotor.

When the rotor starts turning, centrifugal force throws the blades outwards and they slide along the inner surface of the cylinder. In this way, a cell is formed between two blades, and its volume changes continuously during rotation. 

Air enters a cell from the inlet port until the rear blade reaches the far end of the inlet port. At this point the cell has reached its maximum volume. As the cell moves away from the port, its volume becomes smaller and smaller, so the air is compressed and the pressure rises.

This continues until the pressure in the cell exceeds the pressure in the pressure chamber; the compressed air is then discharged through the outlet port.

Some models are fitted with an exhaust valve that prevents discharged air from flowing back when maximum pressure is reached. In vacuum pumps, the process is similar, but the pressure in the cell decreases while the chamber is at atmospheric pressure.

For pressure-vacuum pumps, the lower end of the vacuum inlet is moved forward. The cell can now be filled through a second inlet. To avoid weakening the vacuum, the second inlet is located about one cell segment away from the main suction inlet. The ratio between vacuum and pressure capacity is affected by the choice of inlet port.

• V-DTE 3/6/8/10 Vacuum Pump Repair view