Automatic flush device

Abstract

An automatic flush device has a valve base, a detecting and controlling unit, an outer cap assembly, a guiding base and a water-controlling unit. The detecting and controlling unit is connected to the valve base and has a solenoid valve. The solenoid valve has a piston retractably mounted on the solenoid valve and having a head formed on an end of the piston. The water-controlling unit is mounted in the valve base, is connected with the guiding base and has a water-controlling tube. The water-controlling tube has a separating segment. The separating segment is formed in the water-controlling tube to divide an inner space of the water-controlling tube into a lower passage and an upper passage. The separating segment has at least one communicating channel, a controlling channel and a bypass channel.

What is claimed is: 
     
         1 . An automatic flush device comprising:
 a valve base comprising
 a valve body having;
 an opening defined in a top of the valve body; 
 a baffle formed on a middle segment of the valve body to divide the valve body into an upper segment and a lower segment; and 
 a holding tube protruding upward from the baffle to form an annular inlet chamber in the upper segment of the valve body; and 
 
 an inlet tube connected to the upper segment of the valve body and communicating with the inlet chamber; 
   a detecting and controlling unit connected to the valve base and comprising
 a solenoid valve having
 a piston retractably mounted on the solenoid valve and having a head formed on an end of the piston; and 
 
 a detector connected to the valve base and electrically connected with the solenoid valve; 
   an outer cap assembly mounted securely on the top of the valve body of the valve base and closing the opening in the valve body of the valve base;   a guiding base mounted in the valve body under the outer cap assembly and comprising
 a guiding disk located between the top of the valve body of the valve base and the outer cap assembly to form a guiding chamber between the guiding disk and the outer cap assembly and having a guiding hole defined through the guiding disk, wherein the guiding chamber communicates with the inlet chamber via the guiding hole; and 
 a guiding tube connected to a bottom of the guiding disk and inserted into the holding tube; and 
   a water-controlling unit mounted in the valve base, connected with the guiding base and comprising a water-controlling tube inserted into the guiding tube and having
 a bottom end protruding from a bottom end of the guiding tube and connected with the solenoid valve; and 
 a separating segment formed in the water-controlling tube to divide an inner space of the water-controlling tube into a lower passage and an upper passage communicating with the guiding chamber, and the separating segment having
 at least one communicating channel longitudinally formed through the separating segment to communicate the upper passage with the lower passage via the at least one communicating channel; 
 a controlling channel longitudinally formed through the separating segment and having an upper opening and a lower opening closed by the head of the piston of the solenoid valve; and 
 a bypass channel radially formed through the separating segment, communicating with the controlling channel and the lower segment of the valve body and being free from communicating with the at least one communicating channel. 
 
   
     
     
         2 . The automatic flush device as claimed in  claim 1 , wherein
 the guiding disk further has a positioning hole axially formed through the guiding disk;   the water-controlling unit further comprises a connecting member inserted into the positioning hole in the guiding disk and having a bottom end securely connected with the water-controlling tube and a through hole axially formed through the connecting member and communicating with the guiding chamber.   
     
     
         3 . The automatic flush device as claimed in  claim 2 , wherein the guiding disk and the guiding tube are integrally formed as a single part. 
     
     
         4 . The automatic flush device as claimed in  claim 3 , wherein the separating segment of the water-controlling tube is cylindrical in a round section; and
 two communicating channels are implemented and are respectively at positions of 0° and 180° of the section of the separating segment; and   the bypass channel has two ends at positions of 90° and 270° of the section of the separating segment respectively.   
     
     
         5 . The automatic flush device as claimed in  claim 1 , wherein the separating segment of the water-controlling tube is cylindrical in a round section; and
 two communicating channels are implemented and are respectively at positions of 0° and 180° of the section of the separating segment; and   the bypass channel has two ends at positions of 90° and 270° of the section of the separating segment respectively.