Combustion apparatus

Abstract

A combustion apparatus includes a combustion part, a blower fan, an ignition device, and a control part. The control part selectively performs continuous combustion in which the combustion part is operated to burn continuously and intermittent combustion in which a combustion period and a non-combustion period of the combustion part are repeatedly provided. When the continuous combustion is stopped, the control part extinguishes the combustion part and operates the blower fan to perform a scavenging operation. When the combustion period in the intermittent combustion is ended, the control part extinguishes the combustion part and operates the blower fan to perform a scavenging operation in the non-combustion period. A total air blowing amount of the blower fan in the scavenging operation during the non-combustion period is set to be less than a total air blowing amount of the blower fan in the scavenging operation when the continuous combustion is stopped.

What is claimed is: 
     
         1 . A combustion apparatus, comprising:
 a combustion part for burning a fuel;   a blower fan that blows an air to the combustion part;   an ignition device for igniting the combustion part; and   a control part that controls operations of the combustion part, the blower fan, and the ignition device,   wherein the control part is configured to selectively perform a continuous combustion in which the combustion part is operated to burn continuously and an intermittent combustion in which a combustion period and a non-combustion period of the combustion part are repeatedly provided,   when the continuous combustion is stopped, the control part extinguishes the combustion part and operates the blower fan to perform a scavenging operation,   when the combustion period in the intermittent combustion is ended, the control part extinguishes the combustion part and operates the blower fan to perform a scavenging operation in the non-combustion period, and   a total air blowing amount of the blower fan in the scavenging operation during the non-combustion period is set to be less than a total air blowing amount of the blower fan in the scavenging operation when the continuous combustion is stopped.   
     
     
         2 . The combustion apparatus according to  claim 1 , wherein
 when the continuous combustion is stopped, the control part performs:
 a first scavenging operation in which the blower fan is operated at a first rotation speed for a first time, and 
 a second scavenging operation in which the blower fan is operated at a second rotation speed for a second time; 
   wherein the total air blowing amount of the blower fan in the scavenging operation during the non-combustion period is set to be:
 greater than or equal to a total air blowing amount of the blower fan in the first scavenging operation, and 
 less than a total value of the total air blowing amount of the blower fan in the first scavenging operation and a total air blowing amount of the blower fan in the second scavenging operation. 
   
     
     
         3 . The combustion apparatus according to  claim 1 , wherein
 when the continuous combustion is stopped, the control part performs:
 a first scavenging operation in which the blower fan is operated at a first rotation speed for a first time, and 
 a second scavenging operation in which the blower fan is operated at a second rotation speed for a second time, 
   wherein during the non-combustion period, the control part performs only the first scavenging operation.   
     
     
         4 . The combustion apparatus according to  claim 1 , wherein
 the combustion apparatus is installed in a hot water supplier, and   the hot water supplier comprises:
 a heating flow path that passes through a heat exchanger for heating a low-temperature water by a heat amount generated by the combustion part; and 
 a temperature detector that detects a temperature of a high-temperature water output from the heat exchanger, 
   wherein in the intermittent combustion, the control part switches between the combustion period and the non-combustion period according to a comparison between a detection temperature of the temperature detector and a target temperature range.   
     
     
         5 . The combustion apparatus according to  claim 4 , wherein
 in the intermittent combustion, the control part extinguishes the combustion part when the detection temperature becomes greater than an upper limit value of the target temperature range in the combustion period and ignites the combustion part when the detection temperature becomes less than a lower limit value of the target temperature range in the non-combustion period.   
     
     
         6 . The combustion apparatus according to  claim 1 , wherein
 the control part performs the intermittent combustion when a required heat generation amount is less than a lower limit value of a heat generation amount range of the continuous combustion.   
     
     
         7 . The combustion apparatus according to  claim 2 , wherein
 when the continuous combustion is stopped, the control part performs:
 a first scavenging operation in which the blower fan is operated at a first rotation speed for a first time, and 
 a second scavenging operation in which the blower fan is operated at a second rotation speed for a second time, 
   wherein during the non-combustion period, the control part performs only the first scavenging operation.   
     
     
         8 . A combustion apparatus, comprising:
 a combustion part for burning a fuel;   a blower fan that blows an air to the combustion part;   an ignition device for igniting the combustion part; and   a control part that controls operations of the combustion part, the blower fan, and the ignition device,   wherein the control part is configured to perform an intermittent combustion in which a combustion period and a non-combustion period of the combustion part are repeatedly provided,   when the intermittent combustion is stopped, the control part extinguishes the combustion part and operates the blower fan to perform a scavenging operation,   when the combustion period in the intermittent combustion is ended, the control part extinguishes the combustion part and operates the blower fan to perform a scavenging operation in the non-combustion period, and   a total air blowing amount of the blower fan in the scavenging operation during the non-combustion period is set to be less than a total air blowing amount of the blower fan in the scavenging operation when the intermittent combustion is stopped.