Toilet tank automatic flush apparatus

Abstract

A toilet tank automatic flush apparatus includes a detection module located outside the toilet water tank, a solenoid valve module and a flush module. The solenoid valve module is located outside the water tank and connected to a water supply head, and is controlled by signals from the detection module to activate a solenoid valve switch to channel water from the water supply head into a hydraulic cylinder of the flush module through a tube to generate a hydraulic pressure to push a hydraulic arm upwards to lift a rocker arm. The rocker arm has a distal end fastening to a rope to connect and open a water discharge valve so that water in the water tank may be flushed into the toilet in a large quantity. The solenoid valve switch stops water supply after a preset time period. A spring located in the hydraulic cylinder pushes the hydraulic arm and the rocker arm downwards to release the rope so that the water discharge valve may be closed and water may flow into the water tank again.

1 . A toilet tank automatic flush apparatus comprising a detection module to detect user's use conditions and emit a control signal, a solenoid valve module to receive the control signal to activate hydraulic operation, and a flush module hydraulically controlled by the detection module to execute flushing; wherein: 
 the detection module is installed outside a toilet water tank on a location sensible to users;    the solenoid valve module is located outside the water tank including a solenoid valve switch which has an input end connecting to a water supply head and a signal receiver; and    the flush module is located in the water tank including a upright post and a hydraulic cylinder mounting on one side the post for housing a hydraulic arm, the hydraulic arm having a top end running through a spring to pivotally couple with a rocker arm, the rocker arm having a distal end fastened to a rope which connects to a water discharge valve of the water tank, the hydraulic cylinder having a bottom end connecting to an output end of the solenoid valve switch.    
   
   
       2 . The toilet tank automatic flush apparatus of  claim 1 , wherein the water supply head connected to the input end of the solenoid valve switch is also the water supply head of the water tank.  
   
   
       3 . The toilet tank automatic flush apparatus of  claim 2 , wherein the water supply head connected to the input end of the solenoid valve switch is coupled to a three-way duct to connect to the solenoid valve switch and the water tank to channel water simultaneously.  
   
   
       4 . The toilet tank automatic flush apparatus of  claim 1 , wherein the water supply head connected to the input end of the solenoid valve switch differs from the water supply head of the water tank.  
   
   
       5 . The toilet tank automatic flush apparatus of  claim 1 , wherein the water discharge valve is a buoyant member floatable upwards and downwards.  
   
   
       6 . The toilet tank automatic flush apparatus of  claim 1 , wherein the water discharge valve is not floatable upwards and downwards.