Washing machine

Abstract

The object of the present disclosure is to provide a washing machine capable of detecting that washings in a washing drum are in a state unsuitable for a dewatering process in a phase earlier than the dewatering process. The washing machine includes: a washing drum; a stirring component; a motor; and a microcomputer for controlling water supply and drainage for the washing drum or controlling a voltage applied to the motor to rotate the stirring component. During a washing process, the microcomputer obtains an index which indicates a size of resistance generated by the washings in the washing drum to rotation of the stirring component. When the index exceeds a specified threshold since the resistance in the washing process is less than a specified resistance, the microcomputer judges that the washings in the washing drum are in a state unsuitable for the dewatering process.

What is claimed is: 
     
         1 . A washing machine, comprising:
 a washing drum for accommodating washings;   a stirring component configured to face the washings from a lower side inside the washing drum and capable of rotating in a manner of stirring the washings in the washing drum;   a motor for rotating the stirring component;   an execution unit for executing water supply and drainage for the washing drum or controlling a voltage applied to the motor to rotate the stirring component, and for executing washing operation comprising a washing process for rotating the stirring component in a state that water is stored in the washing drum and a dewatering process after the washing process;   a threshold setting unit for setting a specified threshold according to a size of a load of the washings in the washing drum;   an acquirement unit for acquiring an index which indicates a size of resistance generated by the washings in the washing drum to rotation of the stirring component during the washing process; and   a judgment unit for judging that the washings in the washing drum are in a state unsuitable for the dewatering process when the index exceeds the specified threshold since the resistance in the washing process is less than the specified resistance.   
     
     
         2 . The washing machine according to  claim 1 , wherein
 the acquirement unit calculates the index according to inertial rotation quantity of the motor after the execution unit stops applying the voltage to the motor during the rotation process of the stirring component.   
     
     
         3 . The washing machine according to  claim 1 , wherein the acquirement unit calculates the index according to a maximum rotating speed of the motor within a specified period in the rotation process of the stirring component. 
     
     
         4 . The washing machine according to  claim 1 , wherein
 the washing machine further comprises a second acquirement unit for acquiring a second index which indicates a size of a load of the washings in the washing drum; and   under a condition that the second index exceeds another threshold different from the specified threshold since the load is large enough to exceed the specified threshold, the judgment unit judges that the washings in the washing drum are in a state unsuitable for the dewatering process.   
     
     
         5 . The washing machine according to  claim 1 , wherein
 under a condition that the judgment unit judges that the washings in the washing drum are in a state unsuitable for the dewatering process, the execution unit executes special drainage of the washing drum during the washing process so that a water level in the washing drum is decreased to a specified water level.   
     
     
         6 . The washing machine according to  claim 5 , wherein
 the washing drum is rotatable and the motor enable the washing drum to rotate, and the execution unit controls the voltage applied to the motor during the dewatering process so as to rotate the washing drum;   under a condition that the washings are biased in the washing drum during the dewatering process, the execution unit executes correction treatment for rotating the stirring component in a state that the water is stored in the washing drum to a set water level in order to correct a bias of the washings; and   the washing machine further comprises a setting unit for setting the set water level in the correction treatment after the washing process to be lower than a water level that the special drainage is not executed under a condition that special drainage is executed during the washing process.   
     
     
         7 . The washing machine according to  claim 5 , wherein
 during the washing process, when the index acquired by the acquirement unit exceeds the specified threshold after the special drainage, the execution unit executes the special drainage again, and then executes at least one of treatment of strengthening a water flow in the washing drum and treatment of prolonging the washing process.   
     
     
         8 . The washing machine according to  claim 2 , wherein the acquirement unit calculates the index according to a maximum rotating speed of the motor within a specified period in the rotation process of the stirring component. 
     
     
         9 . The washing machine according to  claim 2 , wherein
 the washing machine further comprises a second acquirement unit for acquiring a second index which indicates a size of a load of the washings in the washing drum; and   under a condition that the second index exceeds another threshold different from the specified threshold since the load is large enough to exceed the specified threshold, the judgment unit judges that the washings in the washing drum are in a state unsuitable for the dewatering process.   
     
     
         10 . The washing machine according to  claim 3 , wherein
 the washing machine further comprises a second acquirement unit for acquiring a second index which indicates a size of a load of the washings in the washing drum; and   under a condition that the second index exceeds another threshold different from the specified threshold since the load is large enough to exceed the specified threshold, the judgment unit judges that the washings in the washing drum are in a state unsuitable for the dewatering process.   
     
     
         11 . The washing machine according to  claim 2 , wherein
 under a condition that the judgment unit judges that the washings in the washing drum are in a state unsuitable for the dewatering process, the execution unit executes special drainage of the washing drum during the washing process so that a water level in the washing drum is decreased to a specified water level.   
     
     
         12 . The washing machine according to  claim 3 , wherein
 under a condition that the judgment unit judges that the washings in the washing drum are in a state unsuitable for the dewatering process, the execution unit executes special drainage of the washing drum during the washing process so that a water level in the washing drum is decreased to a specified water level.   
     
     
         13 . The washing machine according to  claim 4 , wherein
 under a condition that the judgment unit judges that the washings in the washing drum are in a state unsuitable for the dewatering process, the execution unit executes special drainage of the washing drum during the washing process so that a water level in the washing drum is decreased to a specified water level.   
     
     
         14 . The washing machine according to  claim 6 , wherein
 during the washing process, when the index acquired by the acquirement unit exceeds the specified threshold after the special drainage, the execution unit executes the special drainage again, and then executes at least one of treatment of strengthening a water flow in the washing drum and treatment of prolonging the washing process.