Clothes dryer

Abstract

Provided is a clothes dryer, and the clothes dryer includes a drum, an air supply and exhaust unit for supplying and discharging the air for drying to and from the drum, a burner for heating the air for drying, a temperature sensor for detecting the exhaust temperature, and a heating control unit for performing a temperature adjustment processing. The temperature adjustment processing enables the burner to stop when the exhaust temperature reaches an upper limit temperature and enables the burner to re-operate when the exhaust temperature is lowered to a specified re-ignition temperature. The heating control unit is provided with a re-ignition temperature adjustment part that performs an adjustment to lower the re-ignition temperature, and the re-ignition temperature is gradually lowered through the re-ignition temperature adjustment part every time when the temperature adjustment processing is repeated and intermittently to perform the re-ignition.

What is claimed is: 
     
         1 . A clothes dryer, comprising:
 a drum capable of accommodating clothes,   an air supply and exhaust unit for supplying and discharging air for drying to and from the drum,   a heating unit for heating the air for drying supplied to the drum,   an exhaust temperature detection unit for detecting the temperature of the air for drying that is discharged from the drum, and   a heating control unit for performing a temperature adjustment processing as follows: stopping the heating unit when an exhaust temperature detected by the exhaust temperature detection unit reaches a predetermined upper limit temperature, and re-operating the heating unit to perform a re-ignition when the exhaust temperature drops to a predetermined re-ignition temperature, wherein   the heating control unit is provided with a re-ignition temperature adjustment part that performs an adjustment to lower the re-ignition temperature, and the re-ignition temperature is gradually lowered through the re-ignition temperature adjustment part every time when the temperature adjustment processing is repeated intermittently to perform the re-ignition.   
     
     
         2 . The clothes dryer according to  claim 1 , wherein the re-ignition temperature adjustment part lowers the re-ignition temperature in stages by a predetermined temperature to determine a new re-ignition temperature every time when the temperature adjustment processing is performed. 
     
     
         3 . The clothes dryer according to  claim 2 , wherein the re-ignition temperature adjustment part pre-sets a lower limit value for the re-ignition temperature, and when the temperature adjustment processing is repeated to enable the re-ignition temperature to reach the lower limit value, the re-ignition temperature adjustment part keeps the re-ignition temperature at the lower limit value, and the heating control unit performs the re-ignition at the re-ignition temperature thereafter. 
     
     
         4 . The clothes dryer according to  claim 2 , wherein the re-ignition temperature adjustment part acquires an elapsed time from the re-ignition until the exhaust temperature reaches a predetermined upper limit temperature, and adds a correction value to the predetermined temperature based on the elapsed time. 
     
     
         5 . The clothes dryer according to  claim 1 , wherein the heating unit is a non-adjustable burner having no thermal power adjustment function. 
     
     
         6 . The clothes dryer according to  claim 3 , wherein the re-ignition temperature adjustment part acquires an elapsed time from the re-ignition until the exhaust temperature reaches a predetermined upper limit temperature, and adds a correction value to the predetermined temperature based on the elapsed time. 
     
     
         7 . The clothes dryer according to  claim 2 , wherein the heating unit is a non-adjustable burner having no thermal power adjustment function. 
     
     
         8 . The clothes dryer according to  claim 3 , wherein the heating unit is a non-adjustable burner having no thermal power adjustment function. 
     
     
         9 . The clothes dryer according to  claim 4 , wherein the heating unit is a non-adjustable burner having no thermal power adjustment function. 
     
     
         10 . The clothes dryer according to  claim 6 , wherein the heating unit is a non-adjustable burner having no thermal power adjustment function.