| 摘要 |
A device for mixing air, soap and water and delivering the resultant foamy soap mixture to a spray wand (42) comprises a mixing chamber (4) able to withstand the high pressures existent when a pressure washer system is in the wash or rinse mode; a high-pressure inlet line (9); an air-supply line with a pressure regulator (16) and a check valve (18); a soap-supply (26) line with a regulator valve (24); and a discharge line (34) with a high pressure gauge (40), all of which are housed in a container. When a soap-applicator nozzle is attached to the end of the spray wand, the resultant system pressure drop to near zero causes the pressure washer soap syphon to introduce soap into the pressure washer discharge line. The amount of soap thus syphoned is regulated by a valve. The soap/water mixture then enters the mixing chamber, where air is forced into the mixture. The air enters the mixing chamber through an air-supply line and a check valve. The air pressure in the air-supply line forces open the check valve when the system pressure is near zero. The action of introducing air into the soap/water mixture creates a thick foamy mixture which discharges from the mixing chamber to the supply hose to the wash wand where it is applied to the surface to be cleaned. When the soap-applicator nozzle is exchanged for a high-pressure wash nozzle, the resultant high pressure causes the pressure washer soap syphon to cease operating, and the check valve in the air supply line closes. Clear water under high pressure now enters and exits the mixing chamber, travels to the spray wand and is discharged through the high-pressure nozzle in order to rinse the object surface clean. |
