JPS6335203Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a boiler, and aims to reduce the ignition noise that accompanies the start of combustion, prevent dew condensation and fire outbreak in the burner section, and improve the cooling efficiency of combustion air. An embodiment of the present invention will be described below based on the accompanying drawings.

In the figure, 1 is a can body, 2 is a combustion chamber surrounded by the can body 1, and 3 is a housing that covers the can body 1. 4 is a burner insertion tube welded to the can body 1, and 5 is a burner flange attached to the burner insertion tube 4. 6 is a burner housing attached to the burner flange 5, 7 is a casing provided in the burner housing 6, and 8 is a sirotskov fan inside the casing 7. Reference numeral 9 denotes a broach tube disposed within the burner insertion tube 4. The broach tube 9 and the burner insertion tube 4 are arranged substantially concentrically with the burner 16 at the center. Reference numeral 10 denotes a plurality of ventilation holes provided in the circumferential side wall of the broach tube 9. 11 is a first air passage formed between the burner insertion tube 4 and the broach tube 9, and 17 is a second air passage formed between the broach tube 9 and the burner 16. Reference numeral 12 denotes a current plate provided within the broach tube 9.

15 is an electrode, 13 is a nozzle of burner 16, 1
4 is a burner gasket, which seals the burner flange 5 and the end of the burner housing 6.

In the above configuration, when the boiler is turned on, the Sirotskov fan 8 starts rotating. Due to the rotation of the Sirotskov fan 8, the constant pressure combustion air a advances through the casing 7 to the broach tube 9. The combustion air a traveling through the broach tube 9 is passed through the first air vent 10 provided in the broach tube 9.
The second ventilation path 17 is divided into the direction b, which travels through the second ventilation path 11, and the direction c, which travels through the second ventilation path 17. Combustion air traveling in direction b heads toward the combustion chamber 2 via a first ventilation path 11 consisting of a broach tube 9 and a burner insertion tube 4. Combustion chamber air heading in the c direction becomes air that is split and rectified into primary air and secondary air in the d direction and the e direction by the rectifying plate 12 provided in the second ventilation path 17, and then flows through the electrode 15 and the nozzle 13. Where it is installed, it mixes with oil and combusts. The amount of combustion air at the inlet of the broach tube 9 and the amount of combustion air in the combustion chamber 2 are absolutely equal, but due to the ventilation hole 10 provided in front of the current plate 12, a constant amount of air is generated in the b direction and the c direction. In addition, the primary air and secondary air are also divided in air volume with a certain balance, and while maintaining the optimum balance at the time of ignition, the combustion air at the inlet of the broach tube 9 is Mixed with oil as a small amount of air.

As the amount of air decreases, the pressure naturally decreases, so the pressure at the time of ignition also decreases.

On the other hand, the higher the pressure energy, the higher the ignition noise generated when combustion starts, and therefore the ignition noise becomes extremely small.

As described above, the present invention has a can body with a combustion chamber inside, a burner housing having a combustion air fan inside, and a burner flange on the side of the burner housing. A burner insertion tube facing the chamber and fixed to the can body, and a broach having a plurality of ventilation holes in the circumferential side wall, disposed between the burner insertion tube and the burner, and having one end fixed to the burner housing. and a burner gasket that seals between the burner flange and the end of the burner housing, the broach tube and the burner insertion tube are arranged approximately concentrically around the burner, and the broach tube is arranged from the fan to the burner insertion tube. The combustion air sent to is branched into a first air passage formed between the burner insertion pipe and the broach tube, and a second air passage formed between the broach tube and the burner. The sum of the amount of air flowing through the combustion chamber and the second air passage is made equal to the amount of combustion air supplied to the combustion chamber.

Therefore, the amount of combustion air flowing inside the broach tube, that is, the first air passage, is reduced, and the pressure at the time of ignition is reduced accordingly, so the ignition noise can be reduced. Since the combustion air is supplied from the ventilation passage, there is no shortage of combustion air and combustion characteristics are maintained well.

In addition, in this invention, the burner insertion tube is fixed to the can body, and by taking advantage of the fact that even if the water inside the can boils, the temperature only reaches 100℃, the burner insertion tube is prevented from deteriorating due to high temperatures. Conversely, if combustion exhaust gas comes into contact with this area, condensation will occur, corroding the burner insertion tube and the broach tube into which the condensed water has dripped. Since some of the combustion air is sent in at right angles from the vent, the air from the vent hits the circumferential side wall of the burner insertion tube, and the circumferential side wall of the vent in the broach tube is forced to flow out from the vent. Combustion air is sent through the ventilation passage after creating a turbulent flow with air, so combustion exhaust gas does not enter.
Therefore, there is no problem of corrosion of these parts due to dew condensation.

In addition, the combustion air is supplied from the vent hole of the broach tube through the first ventilation passage, and in this way, the combustion air is supplied more quickly than if the combustion air simply flows on both sides of the broach tube. The cooling efficiency is high, and as a result, thermal deterioration of electrical components on the fan side is less likely to occur.

Furthermore, if the burner housing and burner flange are not sealed with a gasket, combustion exhaust gas may flow backwards and cause a fire. Therefore, in this invention, a burner gasket is provided. In terms of construction, the above effects can be achieved with the simplest construction by providing ventilation holes in the circumferential side wall of the broach tube.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a boiler showing an embodiment of the present invention, Fig. 2 is a cutaway sectional view of the main part in Fig. 1, Fig. 3 is a sectional view taken along the line B-B' in Fig. 1, and Fig. 4 is an enlarged sectional view of the main part of FIG. 3; 4...Burner insertion tube, 5...Burner flange, 6...Burner housing, 9...Broach tube, 10...Vent hole, 11...First air passage, 1
4... Burner patch, 16... Burner, 1
7...Second ventilation path.

Claims (1)

[Scope of utility model registration request] A can body having a combustion chamber inside, a burner housing having a combustion air fan inside, a burner flange on the side of the burner housing, penetrating the can body and facing the combustion chamber; a burner insertion tube fixed to the body, a broach tube having a plurality of ventilation holes in a circumferential side wall, disposed between the burner insertion tube and the burner, and having one end fixed to the burner housing; and the burner flange. The broach tube and the burner insertion tube are arranged approximately concentrically around the burner, and the combustion air sent from the fan to the broach tube is It is branched into a first air passage formed between the burner insertion tube and the broach tube and a second air passage formed between the broach tube and the burner, and the first air passage and the second air passage are separated. A boiler in which the sum of the amount of flowing air is equal to the amount of combustion air supplied to the combustion chamber.