Reciprocating additive mixing pump apparatus and method

Details Reciprocating additive mixing pump apparatus and method Reciprocating additive mixing pump apparatus and method

A - Human Necessities

62

C

A62C 29/00 (2006.01) A62C 11/00 (2006.01) F04C 9/00 (2006.01)

Patent

CA 2096085

RECIPROCATING ADDITIVE MIXING PUMP APPARATUS AND METHOD ABSTRACT OF THE DISCLOSURE A pump apparatus dispenses a liquid and additive mixture and has a pump cylinder with intake and discharge ports with associated valves. An additive supply communicates with the pump cylinder to supply additive with liquid drawn into the pump during an intake stroke prior to a discharge stroke during which a mixture of additive and liquid is discharged from the pump. The additive is mixed in the liquid prior to passing into the intake port and is metered to attain the desired concentration. An aerating nozzle receives mixture discharged from the discharge port to produce foam for various applications, such as fire fighting. The aerating nozzle has a restrictor orifice located adjacent and upstream from air entainment opening in the nozzle. The restrictor orifice can be a simple non- tapered cylindrical passage, but for improved foam generation, the orifice can be a diverging passage with a step between inlet and outlet portions of the passage.

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