Apparatus for foaming a liquid

摘要

In an apparatus for foaming a liquid with an aerating device by which the liquid can be aerated, an outlet arrangement which is in communication with the aerating device via a conduit and a pump arranged in the conduit for transporting the aerated liquid from the aerating device to the outlet arrangement, at least one flow resistor is provided in the conduit or the outlet arrangement which includes a plurality of adjacent resistor elements of an elastic material which are movable relative to one another and between which there are passages through which the aerated liquid is forced whereby a high quality stable foam is generated and a pump control arrangement is provided for maintaining the aerated liquid under pressure.

主权项

1. An apparatus (1) for foaming a liquid supplied in a conduit (7) to an outlet arrangement (8), the apparatus comprising: an aerating arrangement (9) disposed in the conduit (7) for mixing air into the liquid, a displacement pump (5) for pumping the aerated liquid from the aerating arrangement (9) to an outlet arrangement (8) for discharging the aerated liquid, the conduit (7) further including at least one flow resistor (18, 28) which is arranged between the displacement pump (5) and a heating device (16) also disposed in the conduit (7) for heating the aerated liquid and which encloses a plurality of adjacent resistor elements (20a, 20b, 20c) which consist of an elastic material and are movable relative to one another with passages for the aerated liquid formed between the resistor elements (20a, 20b, 20c), the at least one flow resistor (18, 28) being provided with a support for the resistor elements (20a, 20b, 20c) by which the resistor elements (20a, 20b, 20c) are supported and against which they are compressed and densified by pressure forces generated by the liquid forced through the at least one resistor (18, 28), wherein the heating device (16) is in the form of a low pressure boiler with a controllable outlet valve (17) arranged between the heating device (16) and the outlet arrangement (8) and the outlet valve (17) is in communication with a control arrangement for maintaining the aerated liquid in the heating device (16) under a pressure of 0.5 bar to 4 bar.