Process and device for spraying a liquid intermittently, especially a lubricant suspension to be sprayed under high pressure

The device for spraying a liquid or suspension, comprising:

• a pump (2) having an input (1) and an output (3),
• a spray means (4) for spraying the liquid or suspension,
• a filtering device (16) having an input (3a) for the liquid or suspension joining into an antechamber (18), a filter pad or sieve (17) and a filtrate output (3b) laying in the direction of flow behind said filter pad or sieve (17), said antechamber (18) laying in the direction of flow in front of said filter pad or sieve (17) and having a filter cake output (20),
• a shutoff means (25, 26) for shutting off said filter cake output (20), and
• a drainpipe (22),
• said filtering device input (3a) communicating with said pump output (3), said filtrate output (3b) communicating with said spray means (4) and said filter cake output (20) communicating with said drainpipe (22).

A device for spraying a liquid or suspension, comprising:

• a spray means (4) for spraying the liquid or suspension,
• said spray means (4) having a spray nozzle (4) including a valve means for automatically opening and closing, respectively, when the hydraulic input pressure of the liquid or suspension exceeds and falls short respectively of a hydraulic threshold pressure,
• a pump (2) driven pneumatically and adapted to produce a hydraulic pause pressure and a hydraulic spray pressure, said hydraulic pause pressure being lower and said hydraulic spray pressure being higher than said hydraulic threshold pressure,
• said pump (2) being connected to first and second pneumatic pipe means (5, 6),
• said first and second pneumatic pipe means (5, 6) being connected in parallel and fed from a common compressed air source (8),
• said first pneumatic pipe means (5) including a pneumatic pressure reducing means (11) for limiting the pneumatic pressure to a pneumatic pressure calculated to produce said hydraulic pause pressure,
• said second pneumatic pipe means (6) providing a pneumatic pressure calculated to produce said hydraulic spray pressure, and being provided with a shutoff element (13), and
• closing of said shutoff element (13) resulting in the providing of said hydraulic pause pressure and, hence, automatically closing said valve means of said spray means (4) and opening said shutoff element (13) resulting in the providing of said hydraulic spray pressure by said pump and, hence, automatically opening said valve means of said spray means (4).