Automatic flush toilet

1. An automatic flush toilet, comprising:

a toilet stool defining therein a toilet bowl;

a water tank unit defining therein a water storage space;

a first discharge member mounted to said water tank unit, and defining a first discharge port downstream of said water storage space;

a second discharge member mounted to said water tank unit, and defining a second discharge port downstream of said water storage space;

a pipe unit including

a flow-out pipe disposed upstream of said toilet bowl,

a first flow-in pipe disposed downstream of said first discharge port,

a first connection pipe disposed downstream of said first flow-in pipe and upstream of said flow-out pipe, and

a second flow-in pipe disposed downstream of said second discharge port and upstream of said flow-out pipe;

a flush valve which is disposed upstream of said second flow-in pipe, and which is switchable between a closed position, where fluid communication between said second flow-in pipe and said water storage space is blocked, and an open position, where said second flow-in pipe and said water storage space are fluidly communicated with each other;

a manual actuating unit which is coupled to said flush valve for actuating movement of said flush valve from the closed position to the open position;

an electric switching valve which is connected in series between said first flow-in pipe and said first connection pipe, and which is switchable between a blocked state, where fluid communication between said first flow-in pipe and said first connection pipe is blocked, and a communicated state, where said first flow-in pipe and said first connection pipe are fluidly communicated with each other; and

a sensor control unit disposed for controlling switching of said electric switching valve between the blocked state and the communicated state.

2. The automatic flush toilet according to claim 1 , further comprising:

a water inlet valve mounted inside said water storage space, and having a bottom end extending outwardly of said water tank unit; and

a float ball disposed inside said water storage space and pivotally movable relative to a top end of said water inlet valve for controlling said water inlet valve.

3. The automatic flush toilet according to claim 1 , wherein said sensor control unit includes a sensor, and a microcomputer control device which is in signal communication with said sensor and said electric switching valve so as to permit a signal from said sensor to be transmitted to said electric switching valve.

4. The automatic flush toilet according to claim 3 , wherein said sensor is an ultrasonic sensor.

5. The automatic flush toilet according to claim 3 , wherein said sensor is an infrared sensor.

6. The automatic flush toilet according to claim 3 , wherein said electric switching valve is an electric ball valve.

7. The automatic flush toilet according to claim 3 , wherein said electric switching valve is an electric rotary valve.

8. The automatic flush toilet according to claim 3 , wherein said electric switching valve is an electric plunger valve.

9. The automatic flush toilet according to claim 3 , wherein

said water tank unit includes an outer tank body, and an inner tank body which is disposed inside said outer tank body and which defines therein said water storage space; and

said first and second discharge members are separated and mounted on an outer surface of said outer tank body, each of said first and second discharge members extending through said outer and inner tank bodies to permit a respective one of said first and second discharge holes to be disposed downstream of said water storage space.

10. The automatic flush toilet according to claim 9 , wherein

said outer tank body has a first wire hole;

said water tank unit further includes a cover member which is detachably mounted to a top of said outer tank body, and which includes

a base segment configured to cover said water storage space, and having a second wire hole, and

an upright segment extending upwardly from said base segment, and defining therein an installation space which is in spatial communication with said second wire hole;

said sensor is disposed in said installation space and has a sensor head exposed outwardly from said upright segment; and

said microcomputer control device is disposed on said electric switching valve.

11. The automatic flush toilet according to claim 9 , wherein

said flush valve includes

a valve seat disposed in said water storage space and mounted on an inner surface of said inner tank body to permit said valve seat to be disposed upstream of said second discharge port, and

a flapper configured such that when said flush valve is in the closed position, said flapper is disposed to seal said valve seat, and such that when said flush valve is in the open position, the seal between said flapper and said valve seat is broken; and

said manual actuating unit includes

a handle mounted pivotally on an outside of said outer tank body,

a lever disposed inside said water storage space, and coupled to be actuated by said handle, and

a chain connecting said lever to said flapper such that when said handle is manually actuated to operate said lever, said chain is pulled by said lever to thereby move said flush valve to the open position from the closed position.

12. The automatic flush toilet according to claim 3 , wherein

said water tank unit includes an outer tank body defining said water storage space therein; and

said first and second discharge members are separated and mounted on an outer surface of said outer tank body, each of said first and second discharge members extending through said outer tank body to permit a respective one of said first and second discharge holes to be disposed downstream of said water storage space.

13. The automatic flush toilet according to claim 12 , wherein

said water tank unit further includes a cover member which is detachably mounted to a top of said outer tank body, and which includes

a base segment configured to cover said water storage space, and

an upright segment extending upwardly from said base segment, and defining therein an installation space;

said sensor is disposed in said installation space and has a sensor head exposed outwardly from said upright segment; and

said microcomputer control device is disposed on said electric switching valve.

14. The automatic flush toilet according to claim 12 , wherein

said flush valve includes

a valve seat disposed in said water storage space and mounted on an inner surface of said outer tank body to permit said valve seat to be disposed upstream of said second discharge port, and

a flapper configured such that when said flush valve is in the closed position, said flapper is disposed to seal said valve seat, and such that when said flush valve is in the open position, the seal between said flapper and said valve seat is broken; and

said manual actuating unit includes

a handle mounted pivotally on an outside of said outer tank body,

a lever disposed inside said water storage space, and coupled to be actuated by said handle, and

a chain connecting said lever to said flapper such that when said handle is manually actuated to operate said lever, said chain is pulled by said lever to thereby move said flush valve to the open position from the closed position.

15. The automatic flush toilet according to claim 1 , wherein

said pipe unit further includes a second connection pipe disposed downstream of said second discharge port and upstream of said second flow-in pipe;

said flush valve is connected in series between said second connection pipe and said second flow-in pipe; and

said manual actuating unit includes an actuating handle which is pivotally mounted to a valve body of said flush valve to switch said flush valve between the closed and open positions.