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US 6,719,536 B2Granted
Vacuum generator with power failure operation mode
AssigneeJ. Schmalz GmbH
InventorsKurt Schmalz, Thomas Eisele
Life of this patent
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Abstract
Vacuum generator comprising an ejector nozzle which is connected to a compressed-air supply via a compressed-air line, and with a first valve for opening and closing the compressed-air line, wherein a second electrical valve is connected to the suction line of the ejector which is open in the currentless state to connect a pneumatic vacuum switch, circuited in parallel with the first valve, to the suction line.
Claims11
A vacuum generator driven by a compressed-air supply, the generator comprising:
- an ejector nozzle;
- a compressed-air line connected to an input of said ejector nozzle;
- a suction line connected to a vacuum output of said ejector nozzle;
- a first valve for opening and closing said compressed-air line input to said ejector nozzle;
- a pneumatic vacuum switch circuited in parallel with said first valve;
- and
- a second electrical valve connected between said suction line and said pneumatic vacuum switch, said second electrical valve assuming an open position when no electrical power flows through said second electrical valve.
4 more elements
Dependencies are inferred from the claim text.