Dry Vacuum Pump Systems

Dry Vacuum pump developed with new concepts.

Principle

The suction gas into the inlet of pump is compressed by rotation of rotors and transferred to the peripheral gas passage in just the outside of the casing.  Then, the gas is divided into two portions, one portion is flowing into the back flow gas port of the 1st stage through the peripheral gas passage and another portion flows into the inlet of the 2nd stage.  The outer wall of the peripheral gas passage is cooled by water cooling jacket located outside of the peripheral gas passage.  The intake gas continuously flows through the peripheral gas passage.  The intake gas continuously flows through the peripheral gas passage while radiating heat to the outside wall of the peripheral gas passage. (see Fig. 1)

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A sufficient flow of the back-flow cooling gas is guaranteed due to the pressure difference between suction and discharge of the pump sections.  The back flow cooling gas successively flows inside of the casing, through the outlet and the peripheral gas passage and into the back-flow gas port.  This forms a cycle for protections against heat build up due to the compression in the casing.  Heat radiation is carried out in the peripheral gas passage so that the compression heat produced in the casing is always removed to the outside of the casing while the casing is kept at an appropriate warm temperature. 

Non-Contaminating Process Pumping

The new dry vacuum is completely oil free type vacuum pump developed with a new concept which is different from conventional dry vacuum pumps.  The cooling effect of a high efficiency jacketed pump housing eliminates inter coolers and drain tanks.  There is no condensation of the handling gas in the vacuum pump due to the ideal high temperature operation.  This insure easy solvent recovery in the discharge of the vacuum pump at atmosphere.

Advantages

The advanced technology of the three lobe roots type dry vacuum pump has the following features.

1. Safety - The leak tight pumping system uses no oil or sealing fluid to produce vacuum.  Workers do not have to change or handle contaminated oil or other seal fluids.

2. Wide operating range - the pump operates from atmosphere to a base pressure of 2 to 4 Torr.  The three lobed rotor design permits stable performance at any inlet pressure from atmospheric to blank-off.

3. Clean effluent - Since the pump operates sealant-free, the chance of contamination of the cooling or seal fluid with the process gases is eliminated.  Also, there is no possibility of carryover of the cooling fluid to the pump exhaust.

4. Compact & low maintenance - As the jacketed pump housing eliminates inter coolers, drain tanks and high frame, the pump foot print is very small.  The ground level installation of the pump ensures the easy checking or maintenance.

5.  Solvent recovery - The compact type vacuum pump insures easy recovery of solvent in the discharge of the vacuum pump.  This is done at atmosphere without any controls required to drain condensed liquid.

6. Low level operation - The special designed compact vacuum pump is very low noise type (about 80dB).  The pump can be operated in any situation.

The oil lift out from the inside of the vacuum pump by our high technology.  This oil free design allows pumping of solvent vapors without sacrificing pump performance.  Traditional vacuum pumps employ steam, oil, water and other motive fluids for sealing.  Increasingly, stiff resistance and stricter regulatory control are meeting the waste disposal problems posed by these methods.  Unozawa dry vacuum pump is a prime solution to your process requirements and environmental concerns.

We also manufacture combination sets comprising mechanical booster and dry vacuum pump or liquid ring vacuum pump.  High vacuum applications may have pumping requirements, which exceed the capabilities of vacuum pump alone.  The mechanical booster is an auxiliary unit designed to improve the performance of high vacuum pumps, both in terms of increased capacity and reduced ultimate pressure.  The inter-stage booster can be used to further compress pumped gas into a smaller backing pump.  The mechanical booster has the features of high volumetric efficiency and high compression.