Oven

Abstract

An oven including an inner cabinet forming a cooking chamber; an outer cabinet, to surround the inner cabinet so as to form a cooling passage through which external air passes; an air exhaust apparatus between the outer cabinet and the inner cabinet; a filter arrangeable on the upper side of the inner cabinet such that air from the cooking chamber passes through to the filter; a pressure regulating duct arrangeable on the upper side of the inner cabinet such that air having passed through the filter passes toward the cooling passage; a sensing pipe, arrangeable in the air exhaust apparatus, on the upper side of the filter such that air from the filter passes through a space above the filter and the cooling passage; and a steam sensor, arrangeable in the sensing pipe and measuring the amount of steam contained in the air passing through the sensing pipe.

What is claimed is: 
     
         1 . An oven comprising:
 an internal cabinet forming a cooking chamber;   an external cabinet, to surround the internal cabinet, such that while the external cabinet surrounds the internal cabinet, a cooling passage through which external air passes is formed between the internal cabinet and the external cabinet;   an air exhaust device between the external cabinet and the internal cabinet;   a filter arrangeable on an upper side of the internal cabinet such that while the filter is arranged on the upper side of the internal cabinet, air from the cooking chamber passes through to the filter;   a pressure control duct arrangeable at the upper side of the internal cabinet such that while the pressure control duct is arranged at the upper side of the internal cabinet, air having passed through the filter passes through the pressure control duct toward the cooling passage;   a sensing pipe arrangeable in the air exhaust device above the filter such that while the sensing pipe is arranged in the air exhaust device, the sensing pipe allows air from the filter to pass through a space above the filter and the cooling passage; and   a vapor sensor, arrangeable in the sensing pipe, and configured to measure an amount of vapor contained in air passing through the sensing pipe.   
     
     
         2 . The oven of  claim 1  further comprising:
 a contamination preventing part arrangeable below the vapor sensor such that while the contamination preventing part is arranged below the vapor sensor, the contamination preventing part prevents vapor from attaching to the vapor sensor. 
 
     
     
         3 . The oven of  claim 2 , wherein
 the contamination preventing part is formed to protrude from an inner surface of the sensing pipe.   
     
     
         4 . The oven of  claim 3 , wherein
 the sensing pipe has a sensor hole formed above the contamination preventing part, and   wherein a tip of the vapor sensor is inserted into the sensor hole and seated on the contamination preventing part.   
     
     
         5 . The oven of  claim 3 , further comprising:
 an eddy preventing part on the inner surface of the sensing pipe and extending upward from both ends of the contamination preventing part.   
     
     
         6 . The oven of  claim 1 , wherein
 the sensing pipe has a cross-sectional area corresponding to an area of a sensing surface of the vapor sensor.   
     
     
         7 . The oven of  claim 1 , wherein
 the sensing pipe includes an inflow port and an outflow port, and   the inflow port and the outflow port are formed at opposite ends of the sensing pipe to face each other.   
     
     
         8 . The oven of  claim 7 , wherein
 an area of the inflow port is greater than an area of the outflow port.   
     
     
         9 . The oven of  claim 1 , wherein
 the vapor sensor is perpendicular to a longitudinal direction of the sensing pipe.   
     
     
         10 . The oven of  claim 1 , wherein
 the air exhaust device includes an exhaust duct that discharges air to an outside of the oven, and   wherein the sensing pipe further comprises a fixing part fixed to the exhaust duct.   
     
     
         11 . The oven of  claim 10 , wherein
 the fixing part is formed in an annular shape, and   the fixing part includes a seal on a lower side of the fixing part.   
     
     
         12 . The oven of  claim 10 , wherein
 the sensing pipe comprises a sealing part spaced by a predetermined distance downward from the fixing part and formed to seal between an upper surface of the internal cabinet and the sensing pipe.   
     
     
         13 . An oven comprising:
 an internal cabinet forming a cooking chamber;   an external cabinet, to surround the internal cabinet such that while the external cabinet surrounds the internal cabinet, a cooling passage through which external air passes is formed between the internal cabinet and the external cabinet;   an air exhaust device arrangeable on an upper side of the internal cabinet, the air exhaust device including an exhaust duct formed to discharge air to an outside;   a filter, arrangeable on an upper side of the internal cabinet, such that while the filter is arranged on the upper side of the internal cabinet, air from the cooking chamber passes through to the filter;   a pressure control duct, arrangeable on an upper side of the internal cabinet, such that while the pressure control duct is arranged at the upper side of the internal cabinet, air having passed through the filter passes through the pressure control duct toward the cooling passage;   a sensing pipe, arrangeable above the filter to pass through the exhaust duct, such that while the sensing pipe is arranged above the filter, the sensing pipe allows air from the filter to pass through a space above the filter;   a vapor sensor arrangeable in the sensing pipe and configured to measure an amount of vapor contained in the air passing through the sensing pipe; and   a contamination preventing part, arrangeable on an inner surface of the sensing pipe below the vapor sensor, such that while the contamination preventing part is arranged on the inner surface of the sensing pipe, the contamination preventing part prevents vapor from attaching to the vapor sensor.   
     
     
         14 . The oven of  claim 13 , wherein
 the contamination preventing part is formed to surround a lower portion of the vapor sensor and protrude from the inner surface of the sensing pipe.   
     
     
         15 . The oven of  claim 14 , further comprising:
 an eddy preventing part on the inner surface of the sensing pipe and extending upward from both ends of the contamination preventing part.