Vacuum siphon apparatus has an ejector and a pneumatic vacuum switch in a suction line that connects a pressure line with a switch coupled to an optical alarm

摘要

An vacuum siphon has an ejector (12) which is connectable via a pressure line (14) with an air pressure source (20) and a suction line (26). A pneumatic vacuum switch (38) on the suction line (26) connects the pressure line with a switch (42) which is coupled to an optical alarm (44). In its resting state, the pneumatic vacuum switch separates the switch (42) from the pressure line (14). On reaching the required under pressure, the pneumatic switch opens and connects the switch (42) with the pressure line (14). The switch (42) is preferably a 3/2 way valve which in it's resting state separates the warning device (44) from the pressure line (14) and connects the pressure line and alarm on application of pressure. The alarm (44) is preferably a digital switch or a cylinder (46) with a self-operating return mechanism which is either a spring (42) or a permanent magnet. The cylinder is preferably attached to a display device, e.g. a two color table. An acoustic alarm may be The drawing shows a schematic of a vacuum siphon apparatus. Ejector 12 Pressure line 14 Pressure source 20 Suction line 26 Vacuum source 28 Pneumatic vacuum switch 38 Switch 42 Alarm 44 Cylinder 4690