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BACKGROUND OF THE INVENTION 
     a) Field of the Invention 
     The invention relates to a leak-proof water valve of a toilet tank and, more particularly, to a leak-proof water valve of the toilet tank with self-sealing function, which is provided to stop water flowing into the toilet tank when a sealing plug of the toilet tank is leaking, to achieve automatic stop-leaking purpose. 
     b) Description of Prior Art 
     Water shortage problem is increasingly severe in recent years. Governments at all levels mostly charge a fine as punishment for wasting water to remind the importance of saving water. Except a washing machine, a toilet tank is the place that consumes most water in a common family. An abnormal water-consuming situation of a toilet tank is usually the most inconspicuous one, so that consumers usually find water leakage after it happens for a long period of time, there is a punitive fine and it is also unnecessary waste of water resources. 
     Above all, one of the main reasons of the toilet tank problem is that the sealing plug is leaking. If a large amount of water leakage is not immediately stopped, water rate may become huge water rate. Although, some solutions have been proposed for avoiding this kind of water leakage situation in industry, there is no ideal results so far. 
     SUMMARY OF THE INVENTION 
     In view of this, the object of the invention is to provide a leak-proof water valve of a toilet tank, namely, the object of the invention is to provide a leak-proof water valve of the toilet tank with self-sealing function, which is provided to stop water flowing into the toilet tank when a sealing plug of the toilet tank is leaking, to achieve automatic stop-leaking purpose. 
     To achieve the object, the first embodiment of the leak-proof water valve of the toilet tank of the present invention, including a water inner tube, an outer tube group and a buoyant housing, wherein: 
     the water inner tube, an engaging bolt and multiple outlets are set on its lower side, the engaging bolt is set on a bottom side of the toilet tank and a locking nut is used to fasten; 
     the outer tube group, which is consisted of an outer tube, a cover, a connecting rod, an adjustment rod, a sealing plug and an elastic element; the outer tube is set on an outer peripheral edge of the water inner tube, a water control base and an outlet pipe are set on an upper end of the outer tube, a first arm, a second arm and an outlet hole are set on the water control base, the outlet hole is communicated with an outlet through pipe set inside the outer tube, a first positioning hole and a first shaft hole are set on the first arm, a second shaft hole is set on the second arm, the first shaft hole is corresponded to the second shaft hole; the cover is covered on a top of the water control base; a second positioning hole, two corresponding supporting shafts and two hook arms are set on an inner side of the connecting rod, a notch is set between the two hook arms, the two corresponding supporting shafts are set into the first and second shaft holes respectively, a holder is set on an outer side of the connecting rod; a sleeve segment set on an upper end of the adjustment rod is provided for the holder to hold, an adjustment segment is set on a lower section of the adjustment rod; a transverse rod is set on an upper end of the sealing plug, the transverse rod is clamped by the two hook arms, an lower section of the sealing plug is a cotter, the cotter is inserted between the outlet hole and a through hole of a pad, the sealing plug is provided to move up and down to control operations of the outlet through pipe; a first pin of the elastic element is fixed to the first positioning hole, a second pin of the elastic element is fixed to the second positioning hole; 
     the buoyant housing, a punched hole set on it is provided for the outer tube being inserted, so that the buoyant housing could be moved up and down on the peripheral edge of the outer tube, a preloading room and a loading room are set on a top of the buoyant housing, the position of the preloading room is higher than the loading room, a water hole is set between the preloading room and the loading room, a buoyant room is set on a bottom side of the buoyant housing, two corresponding slides and two corresponding third arms are set outside of the peripheral edge of the buoyant housing corresponding to the loading room, a first drain hole is set between the two slides, the two slides are provided for a switching blade to embed into, a second drain hole is set on a lower side of the switching blade, a shaft hole is set on the third arm, the shaft hole is provided for a supporting shaft of a positioning collar to set on, a hollow hole set on the positioning collar is provided for the adjustment segment of the adjustment rod to insert. 
     The second embodiment of the leak-proof water valve of a toilet tank of the present invention, which includes a water inner tube, an outer tube group and a buoyant housing, wherein: 
     the water inner tube, an engaging bolt and multiple outlets are set on its lower side, the engaging bolt is set on a bottom side of the toilet tank and a locking nut is used to fasten; 
     the outer tube group, which is consisted of an outer tube, a cover, a connecting rod, an adjustment rod, a sealing plug, a cross rod and an elastic element; the outer tube is set on an outer peripheral edge of the water inner tube, a water control base and an outlet pipe are set on an upper end of the outer tube, a first arm, a second arm, a shaft tube and an outlet hole are set on the water control base, the outlet hole is communicated with an outlet through pipe set inside the outer tube, a first positioning hole and a first shaft hole are set on the first arm, a second shaft hole is set on the second arm, the first shaft hole is corresponded to the second shaft hole; the cover is covered on a top of the water control base; a second positioning hole, two corresponding supporting shafts and two hook arms are set on an inner side of the connecting rod, a notch is set between the two hook arms, the two corresponding supporting shafts are set into the first and second shaft holes respectively, a holder is set on an outer side of the connecting rod; a sleeve segment set on an upper end of the adjustment rod is provided for the holder to hold, an adjustment segment is set on a lower section of the adjustment rod; a transverse rod is set on an upper end of the sealing plug, the transverse rod is clamped by the two hook arms, an lower section of the sealing plug is a cotter, the cotter is inserted between the outlet hole and a through hole of a pad, the sealing plug is provided to move up and down to control operations of the outlet through pipe; an end of the cross rod is connected to an end of a second chain, another end of the second chain is set on a pull rod, a hinge is set on another end of the cross rod, the hinge is set on the shaft tube; a first pin of the elastic element is fixed to the first positioning hole, a second pin of the elastic element is fixed to the second positioning hole; 
     the buoyant housing, a punched hole set on it is provided for the outer tube being inserted, so that the buoyant housing could be moved up and down on the peripheral edge of the outer tube, a preloading room and a loading room are set on a top of the buoyant housing, the position of the preloading room is higher than the loading room, a water hole is set between the preloading room and the loading room, a buoyant room is set on a bottom side of the buoyant housing, two corresponding third arms and a first drain hole are set outside of the peripheral edge of the buoyant housing corresponding to the loading room, a shaft hole is set on the third arm, the shaft hole is provided for a supporting shaft of a positioning collar to set on, a hollow hole set on the positioning collar is provided for the adjustment segment of the adjustment rod to insert. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a three-dimensional exploded diagram of the first embodiment of the present invention; 
         FIG. 2  is a three-dimensional diagram of the first embodiment of the present invention; 
         FIG. 3  is a configuration diagram of the toilet tank of the first embodiment of the present invention; 
         FIG. 4  is a partial three-dimensional diagram of the connecting rod of the first and second embodiments of the present invention; 
         FIG. 5  is a partial three-dimensional diagram of the assembly of the connecting rod and the water control base of the first embodiments of the present invention; 
         FIG. 6  is a schematic diagram ( 1 ) of operation of the first embodiment of the present invention; 
         FIG. 7  is a schematic diagram ( 2 ) of operation of the first embodiment of the present invention; 
         FIG. 8  is a schematic diagram ( 3 ) of operation of the first embodiment of the present invention; 
         FIG. 9  is a schematic diagram ( 4 ) of operation of the first embodiment of the present invention; 
         FIG. 10  is a three-dimension exploded diagram of the second embodiment of the present invention; 
         FIG. 11  is a three-dimension diagram of the second embodiment of the present invention; 
         FIG. 12  is a configuration diagram of the toilet tank of the second embodiment of the present invention; 
         FIG. 13  is a partial three-dimensional diagram of the assembly of the connecting rod and the water control base of the second embodiments of the present invention; 
         FIG. 14  is a schematic diagram ( 1 ) of operation of the second embodiment of the present invention; 
         FIG. 15  is a schematic diagram ( 2 ) of operation of the second embodiment of the present invention; 
         FIG. 16  is a schematic diagram ( 3 ) of operation of the second embodiment of the present invention; and 
         FIG. 17  is a schematic diagram ( 4 ) of operation of the second embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Please refer to  FIG. 1  to  FIG. 9 , it is the first embodiment of the leak-proof water valve of the toilet tank of the present invention, the leak-proof water valve A includes a water inner tube  1 , an outer tube group  2  and a buoyant housing  3 , wherein: 
     the water inner tube  1 , an engaging bolt  11  and multiple outlets  13  are set on its lower side, the engaging bolt  11  is set on a bottom side of the toilet tank  4  and a locking nut  12  is used to fasten; 
     the outer tube group  2 , which is consisted of an outer tube  20 , a cover  21 , a connecting rod  22 , an adjustment rod  23 , a sealing plug  24  and an elastic element S; the outer tube  20  is set on an outer peripheral edge  10  of the water inner tube  1 , a water control base  201  and an outlet pipe  205  are set on an upper end of the outer tube  20 , a first arm  203 , a second arm  204  and an outlet hole  202  are set on the water control base  201 , the outlet hole  202  is communicated with an outlet through pipe  200  set inside the outer tube  20 , a sealing ring C 1  and a pad C 2  are set between the water control base  201  and the outlet through pipe  200 , a first positioning hole  208  and a first shaft hole  206  are set on the first arm  203 , a second shaft hole  207  is set on the second arm  204 , the first shaft hole  206  is corresponded to the second shaft hole  207 ; the cover  21  is covered on a top of the water control base  201 ; an opening  211  is set on a side of the cover  21 ; a second positioning hole  226 , two corresponding supporting shafts  222 ,  223  and two hook arms  225 ,  227  are set on an inner side of the connecting rod  22 , a notch  24  is set between the two hook arms  225 ,  227 , the two corresponding supporting shafts  222 ,  223  are set into the first shaft hole  206  and second shaft hole  207  respectively, an outer end of the connecting rod  22  is extended out from the opening  211  of the cover  21 , and a holder  221  is set on it; a sleeve segment  232  set on an upper end of the adjustment rod  23  is provided for the holder  221  to hold, an adjustment segment  231  is set on a lower section of the adjustment rod  23 ; a transverse rod  241  is set on an upper end of the sealing plug  24 , the transverse rod  241  is clamped by the two hook arms  225 ,  227 , an lower section of the sealing plug  24  is a cotter  242 , multiple longitudinal grooves  243  are set on the cotter  242 , the cotter  242  is inserted between the outlet hole  202  and a through hole C 21  of a pad C 2 , the sealing plug  24  is provided to move up and down to control operations of the outlet through pipe  200 ; a first pin S 1  of the elastic element S is fixed to the first positioning hole  208 , a second pin S 2  of the elastic element S is fixed to the second positioning hole  226 ; 
     the buoyant housing  3 , a punched hole  301  set on it is provided for the outer tube  20  being inserted, so that the buoyant housing  3  could be moved up and down on the peripheral edge of the outer tube  20 , a preloading room  31  and a loading room  33  are set on a top of the buoyant housing  3 , the position of the preloading room  31  is higher than the loading room  33 , a water hole  311  is set between the preloading room  31  and the loading room  33 , a buoyant room  32  is set on a bottom side of the buoyant housing  3 , two corresponding slides  302  and two corresponding third arms  304  are set outside of the peripheral edge  30  of the buoyant housing  3  corresponding to the loading room  33 , a first drain hole  303  is set between the two slides  302 , the two slides  302  are provided for a switching blade  34  to embed into, a handle  341  is set on an upper side of the switching blade  34 , a second drain hole  343  is set on a lower side of the switching blade  34 , two hook pieces  342  are respectively set on two sides of the switching blade  34 , a shaft hole  305  is set on the third arm  304 , the shaft hole  305  is provided for a supporting shaft  351  of a positioning collar  35  to set on, a hollow hole  350  set on the positioning collar  35  is provided for the adjustment segment  231  of the adjustment rod  23  to insert. 
     Please refer to  FIG. 3 ,  FIG. 6 ,  FIG. 7  simultaneously, in the present invention, by the composition of above elements, under a normal situation without leaking, when a flush handle  401  is pulled downwards, the pull rod  402  is driven to pull the first chain  403  and the sealing plug  41  is raised up, so that water in the toilet tank  4  flows into the flushing outlet  411 , and then the sealing plug  41  moves downwards to seal the flushing outlet  411 . At this time, because the weight of water carried in the preloading room  31  and the loading room  33  of the buoyant housing  3  is larger than elasticity of the elastic element S, the outer end of the connecting rod  22  is pressed due to the weight of carried water, so that the cotter  242  of the sealing plug  24  moves upwards, water flowed from the water inlet valve A flows to the outlet hole  222  from the outlet through pipe  200 . A part of water flows to the outlet pipe  205  and drops into the preloading room  31  of the buoyant housing  3 , flows into the loading room  33  from the water hole  311 , and finally flows into the toilet tank  4  from the second drain hole  343 . At this time, the switching blade  34  is located in a position for detecting leakage automatically (namely, the communicated position of the first drain hole  303  and the second drain hole  343 ). And then, because the buoyant room  32  of the buoyant housing  3  is forced by buoyancy, the buoyant housing  3  may continuously rise with the water level in the toilet tank  4 . Once the predetermined water line is achieved (as shown in  FIG. 8 ), the buoyant housing  3  drives the connecting rod  22  to let its external ends raise, so that the cotter  242  of the sealing plug  24  moves downwards to block the through hole C 21  of the pad C 2  and water stops flowing in. 
     Furthermore, when the sealing plug  41  is leaking (as shown in  FIG. 9 ), water in the toilet tank  4  flows out continuously, water carried by the preloading room  31  and the loading room  33  of the buoyant housing  3  flows out from the first drain hole  303  and the second drain hole  343 . Because the weight of the buoyant housing  3  is not enough to press the elasticity of the elastic element S, so that the connecting rod  22  could not drive the cotter  242  of the sealing plug  24  to move upwards for watering, to thereby achieve automatic leak-proof purpose. Thus, when a user flushes the toilet again, he will know that there is no water in the toilet tank  4  and the leakage problem is needed to be repaired. If the user wants to let water flow into the water inlet valve A again after repair, the connecting rod  22  should be pressed downwards, so that the cotter  242  of the sealing plug  24  would move upwards, water may flow into the toilet tank  4  from the water inlet valve A until the predetermined water line is achieved, and the above-mentioned automatic detection function could be applied under normal situation. 
     If the user doesn&#39;t want to use the automatic leakage detection function, the switching blade  34  should only be switched to let the first drain hole  303  and the second drain hole  343  not be communicated, namely, it is a general usage condition without automatic leak-proof function. 
     Please refer to  FIG. 10  to  FIG. 17 , it is the second embodiment of the leak-proof water valve of the toilet tank of the present invention, the leak-proof water valve A includes a water inner tube  1 , an outer tube group  2  and a buoyant housing  3 , wherein: 
     the water inner tube  1 , an engaging bolt  11  and multiple outlets  13  are set on its lower side, the engaging bolt  11  is set on a bottom side of the toilet tank  4  and a locking nut  12  is used to fasten; 
     the outer tube group  2 , which is consisted of an outer tube  20 , a cover  21 , a connecting rod  22 , an adjustment rod  23 , a sealing plug  24 , a cross rod  25  and an elastic element S; the outer tube  20  is set on an outer peripheral edge  10  of the water inner tube  1 , a water control base  201  and an outlet pipe  205  are set on an upper end of the outer tube  20 , a first arm  203 , a second arm  204 , a shaft tube  209  and an outlet hole  202  are set on the water control base  201 , the outlet hole  202  is communicated with an outlet through pipe  200  set inside the outer tube  20 , a sealing ring C 1  and a pad C 2  are set between the water control base  201  and the outlet through pipe  200 , a first positioning hole  208  and a first shaft hole  206  are set on the first arm  203 , a second shaft hole  207  is set on the second arm  204 , the first shaft hole  206  is corresponded to the second shaft hole  207 ; the cover  21  is covered on a top of the water control base  201 ; an opening  211  is set on a side of the cover  21 ; a second positioning hole  226 , two corresponding supporting shafts  222 ,  223 , two hook arms  225 ,  227  and a first piece  228  are set on an inner side of the connecting rod  22  (please refer to  FIG. 4  and  FIG. 10 ), a notch  224  is set between the two hook arms  225 ,  227 , the two corresponding supporting shafts  222 ,  223  are set into the first shaft hole  206  and the second shaft hole  207  respectively, an outer end of the connecting rod  22  is extended out of the opening  211  of the cover  2  and a holder  221  is set on it; a sleeve segment  232  set on an upper end of the adjustment rod  23  is provided for the holder  221  to hold, an adjustment segment  231  is set on a lower section of the adjustment rod  23 ; a transverse rod  241  is set on an upper end of the sealing plug  24 , the transverse rod  241  is clamped by the two hook arms  225 ,  227 , an lower section of the sealing plug  24  is a cotter  242 , multiple longitudinal grooves  243  are set on the cotter  242 , the cotter  242  is inserted between the outlet hole  202  and a through hole C 21  of the pad C 2 , the sealing plug  24  is provided to move up and down to control operations of the outlet through pipe  200 ; an end of the cross rod  25  is connected to an end of a second chain  251 , another end of the second chain  251  is set on a pull rod  402 , a hinge  252  is set on another end of the cross rod  25 , the hinge  252  is set on the shaft tube  209 ; a second piece  253  is set on a side of the hinge  252 , the second piece  253  is provided to push the first piece  228 ; a first pin S 1  of the elastic element S is fixed to the first positioning hole  208 , a second pin S 2  of the elastic element S is fixed to the second positioning hole  226 ; 
     the buoyant housing  3 , a punched hole  301  set on it is provided for the outer tube  20  being inserted, so that the buoyant housing  3  could be moved up and down on the peripheral edge of the outer tube  20 , a preloading room  31  and a loading room  33  are set on a top of the buoyant housing  3 , the position of the preloading room  31  is higher than the loading room  33 , a water hole  311  is set between the preloading room  31  and the loading room  33 , a buoyant room  32  is set on a bottom side of the buoyant housing  3 , two corresponding third arms  304  and a first drain hole  303  are set outside of the peripheral edge  30  of the buoyant housing  3  corresponding to the loading room  33 , a shaft hole  305  is set on the third arm  304 , the shaft hole  305  is provided for a supporting shaft  351  of a positioning collar  35  to set on, a hollow hole  350  set on the positioning collar  35  is provided for the adjustment segment  231  of the adjustment rod  23  to insert. 
     Please refer to  FIG. 12 ,  FIG. 14 ,  FIG. 15  simultaneously, in the present invention, by the composition of above elements, under a normal situation without leaking, when a flush handle  401  is pulled downwards, the pull rod  402  is driven to pull the first chain  403  and the sealing plug  41  is raised up, so that water in the toilet tank  4  flows into the flushing outlet  411 , and then the sealing plug  41  moves downwards to seal the flushing outlet  411 . When the flush handle  401  is pulled downwards, the pull rod  402  drives the second chain  251  simultaneously and the second piece  253  of the cross rod  25  is driven to push the first piece  228  of the connecting rod  22 , so that the connecting rod  22  is pressed downwards without limiting by the elasticity of the elastic element S, and the weight of water carried in the preloading room  31  and the loading room  33  of the buoyant housing  3  is larger than elasticity of the elastic element S, the outer end of the connecting rod  22  is pressed due to the weight of carried water, so that the cotter  242  of the sealing plug  24  moves upwards, water flowed from the water inlet valve A flows to the outlet hole  202  from the outlet through pipe  200 . A part of water flows to the outlet pipe  205  and drops into the preloading room  31  of the buoyant housing  3 , flows into the loading room  33  from the water hole  311 , and finally flows into the toilet tank  4  from the first drain hole  303 . And then, because the buoyant room  32  of the buoyant housing  3  is forced by buoyancy, the buoyant housing  3  may continuously rise with the water level in the toilet tank  4 . Once the predetermined water line is achieved (as shown in  FIG. 16 ), the buoyant housing  3  drives the connecting rod  22  to let its external ends raise, so that the cotter  242  of the sealing plug  24  moves downwards to block the through hole C 21  of the pad C 2  and water stops flowing in. 
     Furthermore, when the sealing plug  41  is leaking (as shown in  FIG. 17 ), water in the toilet tank  4  flows out continuously, water carried by the preloading room  31  and the loading room  33  of the buoyant housing  3  flows out from the first drain hole  303 . Because the weight of the buoyant housing  3  is not enough to press the elasticity of the elastic element S, so that the connecting rod  22  could not drive the cotter  241  of the sealing plug  24  to move upwards for watering, to thereby achieve automatic leak-proof purpose. Thus, when a user flushes the toilet again, he will know that there is no water in the toilet tank  4  and the leakage problem is needed to be repaired. If the user wants to let water flow into the water inlet valve A again after repair, the flush handle  401  should be pressed downwards, the second chain  251  driven by the pull rod  402  may drive the second piece  253  of the cross rod  25  to push the first piece  228  of the connecting rod  22 , so that pressing the connecting rod  22  downwards is not limited by elasticity of the elastic element S, and the cotter  241  of the sealing plug  24  would move upwards, water may flow into the toilet tank  4  from the water inlet valve A without pressing the connecting rod  22  by hands.

Summary:
A leak-proof water valve includes a water inner tube, an outer tube group and a buoyant housing. When the sealing plug of the toilet tank is leaking, leak-proof structure of a buoyant housing for automatically detection is provided to stop the water inlet valve supplying water, so that a user could be aware of the leaking situation to thereby avoid the waste of water resources.