The task

In state-of-the-art machining processes like high-speed grinding with CBN wheels, a very large amount of air is mixed into the grinding oil during cutting.

Conventional centrifugal pumps can pump these cooling lubricants with high content of air only unsatisfactorily, since an air pocket is formed after a short time already.

In the filter systems, there is no satisfactory filter cake formation due to the cooling lubricant with high content of air. Therefore, the filtering performance is limited.

At the cutting point, no constant lubricant amount is present in the coolant cycle, since the oil amount delivered is reduced by the influence of the air. Thus, the effect of the cooling lubricant is reduced.

When emulsions or oils are used, there partly will be an extremely high formation of foam together with the negative results described above. Tanks will flow over.

Conventional centrifugal pumps need a minimum immersion depth for ensuring stable discharge and delivery conditions (the impeller must be fully immersed into the liquid.) This leads to deposits on the tank bottom which must be removed regularly.

Conventional centrifugal pump

The solution

Quick suctioning immersion pumps with patented BRINKMANN suction de-aeration system (Paten No. 4325549 of the German Office Munich).

An axial impeller in the suction neck conveys the air-oil-mixture into the actual pump chamber. The slurping effect is so strong that the tank level will not rise above the suction opening of the pump. Thus, tanks can be continuously "slurped off" almost to the bottom.

The radial impeller in the pump chamber is reliably filled and seperates air from oil. The light medium air collects around the suction neck and is returned to the tank bottom by channels.

The exhausted air rises upwards in large bubbles, escapes from the tank through the surface and is thus drawn off the circuit.

The cooling lubricant which now is almost completely de-areated will be further circulated in the system with constant amount and pressure. Filter cake is reliably produced and cooling lubricant is available again under clearly defined conditions at the cutting point.

BRINKMANN Quick suctioning immersion pump

Brinkmann quick suctioning immersion pumps

The modular system

STA		SAL		SFL		SGL		STS
Quick suctioning immersion pump		Quick suctioning immersion pump		Quick suctioning immersion pump		Quick suctioning immersion pump		Suction immersion pump
Lifting pump for emulsion with air content		Lifting pump for emulsion with air content		Lifting pump for emulsion/oil with increased chip content		Lifting pump for oil with high air content (fine machining)		Pump for vacuum filter e.g. on split-screen basis for suction pressures of –0,3...–0,5 bar