Air suction device for toilet drainage channel

Abstract

An air suction device for a toilet drainage channel, capable of good and silent toilet flushing. The air suction device ( 200 ) for the toilet drainage channel ( 5 ) has air suction means for sucking air from the toilet drainage channel ( 5 ) connected to the downstream side of a water sealing part ( 4 ) of a toilet body ( 1 ). The air suction means has an ejector ( 30 ) serving as a negative pressure generator and also has a suction tank ( 80 ) connected between the ejector ( 30 ) and the toilet drainage channel ( 5 ). The air suction device ( 200 ) further has a control device (C) for controlling both execution of a suction stroke in which the suction tank ( 80 ) exhausts air into the toilet drainage channel ( 5 ). The control device (C) executes the air suction stroke after the start of the supply of flush water to the bowl ( 2 ) of the toilet body ( 1 ) and then executes the air exhaust stroke before the completion of the supply of the flush water to the bowl ( 2 ).

1 . An air suction device for a toilet drainage channel, provided with an air suction unit which sucks air from a toilet drainage channel connected to a downstream side of a water sealing part of a toilet body, the air suction unit having a negative pressure generator and a suction tank connected between the negative pressure generator and the toilet drainage channel, the air suction device comprising a control device which controls execution of an air suction step in which air is sucked from the toilet drainage channel by the suction tank and execution of an air discharge step in which the air is discharged into the toilet drainage channel by the suction tank, wherein the control device executes the air suction step after start of flush water supply to a toilet bowl of the toilet body and the air discharge step before termination of the flush water supply to the toilet bowl of the toilet body. 
     
     
         2 . The air suction device for the toilet drainage channel according to  claim 1 , wherein the control device executes the air discharge step while a discharge flow due to a siphon action is continuous in the toilet drainage channel after supply of the flush water into the toilet bowl. 
     
     
         3 . The air suction device for the toilet drainage channel according to  claim 1 , wherein the control device executes the air drainage step after the flush water supply to the toilet bowl has been interrupted and before the flush water supply to the toilet is re-started for formation of a water sealing part. 
     
     
         4 . The air suction device for the toilet drainage channel according to  claim 1 , wherein the suction tank has an interior partitioned into a first chamber and a second chamber by a diaphragm movable in an upward and/or a downward direction defined during installation of the suction tank, and the first chamber communicates with the negative pressure generator and the second chamber communicates with the toilet drainage channel. 
     
     
         5 . The air suction device for the toilet drainage channel according to  claim 2 , wherein the suction tank has an interior partitioned into a first chamber and a second chamber by a diaphragm movable in an upward and/or a downward direction defined during installation of the suction tank, and the first chamber communicates with the negative pressure generator and the second chamber communicates with the toilet drainage channel. 
     
     
         6 . The air suction device for the toilet drainage channel according to  claim 3 , wherein the suction tank has an interior partitioned into a first chamber and a second chamber by a diaphragm movable in an upward and/or a downward direction defined during installation of the suction tank, and the first chamber communicates with the negative pressure generator and the second chamber communicates with the toilet drainage channel.