Water level sensing apparatus of dish washer

Abstract

Disclosed is a water level sensing apparatus of a dish washer comprising, a wash tub for containing dishware and a water level sensor disposed in the wash tub and moved in its position according to a water level in the wash tub, alternately comprising, a wash tub for containing dishware a float disposed in the wash tub and ascending/descending according to a water level of the wash tub and a sensing unit sensing a water level corresponding to a position of the float. According to the water level sensing apparatus of the dish washer, it is capable of minimizing influence on a capacity of the wash tub caused by installation of the water level sensor, of precisely sensing the amount of water in the wash tub and of implement the float stably ascending/descending.

1 . A water level sensing apparatus of a dish washer, comprising:
 a wash tub for containing dishware; and   a water level sensor disposed in the wash tub and moved in its position according to a water level in the wash tub.   
   
   
       2 . The apparatus of  claim 1 , wherein the water level sensor comprises a float ascending/descending according to the water level in the wash tub, and a sensing unit sensing the water level corresponding to a position of the float. 
   
   
       3 . The apparatus of  claim 1 , further comprises a cover covering the water level sensor. 
   
   
       4 . The apparatus of  claim 3 , wherein a washing water inflow hole is formed at a lower side of the cover so as to supply washing water to a lower side of the water level sensor. 
   
   
       5 . The apparatus of  claim 4 , wherein the washing water inflow hole is formed between a lower end of the cover and a bottom surface of the wash tub. 
   
   
       6 . A water level sensing apparatus of a dish washer, comprising:
 a wash tub for containing dishware;   a float disposed in the wash tub and ascending/descending according to a water level of the wash tub; and   a sensing unit sensing a water level corresponding to a position of the float.   
   
   
       7 . The apparatus of  claim 6 , wherein the float is connected to the wash tub so as to be operable within a specific range. 
   
   
       8 . The apparatus of  claim 7 , wherein the float is coupled to the wash tub by hinges. 
   
   
       9 . The apparatus of  claim 6 , wherein a magnet and a lead switch are respectively disposed to the float and the sensing unit corresponding thereto. 
   
   
       10 . The apparatus of  claim 9 , wherein the magnet is disposed at the float and the lead switch is disposed at the sensing unit. 
   
   
       11 . The apparatus of  claim 9  or  10 , wherein the magnet is disposed on a line vertically passing through a center of gravity of the float. 
   
   
       12 . The apparatus of  claim 6 , wherein the sensing unit is disposed at a position corresponding to a water level to be sensed in the wash tub. 
   
   
       13 . The apparatus of  claim 12 , wherein the water level to be sensed is at least one of a normal level, an oversupply level, a zero level of the wash tub. 
   
   
       14 . The apparatus of  claim 6 , wherein an adhesion preventing unit is installed between the wash tub and the float so as to prevent the flow from being adhered to a specific portion of the wash tub. 
   
   
       15 . The apparatus of  claim 14 , wherein the adhesion preventing unit comprises a protrusion formed at least one of the float and the portions of the wash tub facing the float. 
   
   
       16 . The apparatus of  claim 6 , wherein the float is implemented as a foam. 
   
   
       17 . The apparatus of  claim 16 , wherein the float is connected to the wash tub by a connection unit integrally formed with the float in a foaming manner. 
   
   
       18 . The apparatus of  claim 16 , further comprises a float case in which the float is installed and connected to the wash tub.