PLANT FOR HYDROPONIC CROP CULTIVATION Russian patent published in 1995 - IPC

FIELD: agriculture. SUBSTANCE: plant for hydroponic crop cultivation has compressor 10 and ejector 8 mutually communicating by means of pipeline 9. The ejector is installed in pipeline 7 between pump 6 and cultivation vessel 1. The plant control unit has series-connected first and second pneumatic-electric relays 11 and 12 and an electric relay. Electric contacts 13 and 14 of the pneumatic-electric relays are normally cut closed. Contact 16 of relay 15 is in the power circuit of electric drive 20 of pump 6. Contact 17 (normally open) is in the power circuit of motor-driven compressor 10. The hydroponic plant functional components are in communication by means of pipelines 4, 7, 9, 18, and 19. EFFECT: simpler design, higher reliability in operation. 1 dwg