JPH0227320Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to the structure of combustion tubes for water heaters, boilers, etc.

(Prior Art) Conventionally, as shown in FIG. 3, a bottomed combustion cylinder main body 10 consisting of an outer cylinder 11 and a refractory cylinder 12 attached to the inside of the outer cylinder 11, and upper and lower parts of the combustion cylinder main body 10 are provided. The combustion tube body 10 has a plurality of pressurized spray nozzles 13a, 13b arranged facing into the combustion tube body 10, and a blower tube 14 and a draft tube 1.
A combustion tube for a water heater is known, in which combustion air A is fed by a blower 16 via 5a and 15b.

(Problems to be Solved by the Invention) In the combustion tube of the water heater, the combustion flame B accompanying the fuel sprayed from the nozzle 13a located at the lower stage is caused by disturbances in wind pressure near the nozzle 13a in the blast tube 14,
And a part of the combustion air A flowing into the combustion cylinder main body 10 from the draft tube 15b located at the upper stage.
The combustion flame B is disturbed by the combustion cylinder main body 10
The problem is that the bottom part 12a of the refractory tube 12 comes into contact with the center of the bottom part 12a or on the opposite sides of the draft tubes 15a and 15b, causing local damage to the refractory tube 12. In particular, when the height of the water heater is kept constant, as the number of burner stages increases, such as three or four stages, the lowermost burner is more likely to cause the above problem. Further, the turbulence of the combustion flame B has the problem of generating carbon monoxide and hydrocarbons, causing incomplete combustion, and further generating soot and carbon.

In view of the above-mentioned conventional problems, the purpose of this invention is to stabilize the combustion flame of pressurized spray burners, prevent damage to the combustion cylinder body and incomplete combustion, and provide water heaters etc. that do not generate soot or carbon. The aim is to provide combustion cylinders for

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a pressurized spray burner in which combustion air is fed into a draft tube in which a nozzle is arranged, and a bottomed combustion tube body. The tip of the draft tube passes through the side wall of the combustion tube main body and faces into the combustion tube main body, and the tip of the draft tube has a ridged portion extending toward the inside of the draft tube. In a combustion tube of a water heater or the like, an air guide portion is provided at least at one location opposite to the draft tube from approximately the center of the bottom of the combustion tube body, and the air guide portion is provided on the side of the draft tube. The present invention is characterized in that a guide surface is provided that guides a portion of the combustion air that extends obliquely upward toward the opposite side of the draft tube.

(Function) According to the present invention, an air guide portion is provided at least at one location from the approximate center of the bottom of the combustion cylinder body to the opposite side of the draft tube, and the air guide portion is provided with the draft tube on the side of the draft tube. Since the combustion air guide surface extending diagonally upward toward the opposite side of the combustion tube body is provided, the combustion air flowing to the bottom of the combustion tube body flows diagonally upward by the guide surface of the air guide portion, thereby preventing the draft tube from forming a pattern. The combustion flame that started at the edge is converged again from the bottom,
and separating the combustion flame from the bottom.

(Embodiment) FIGS. 1 and 2 a and b show an embodiment of the present invention, and the same components as in the conventional example are denoted by the same reference numerals. That is, 10 is a combustion cylinder main body, which consists of an outer cylinder 11 made of copper and a refractory cylinder 12 made of ceramic fiber.The outer cylinder 11 and the refractory cylinder 12 are each formed with a bottom, and the inner surface of the outer cylinder 11 is The refractory tube 12 is attached to cover it.

Reference numerals 13a and 13b denote a plurality of nozzles, which are arranged in draft tubes 15a and 15b that vertically penetrate one side wall of the combustion cylinder main body 10, and the tips of each draft tube 15a and 15b face the inside of the refractory cylinder 12. It is arranged in. Further, at the tips of each draft tube 15a, 15b, ridges 15a', 15b' are formed which extend toward the inside of each draft tube 15a, 15b. 14 is blower 1
This is a blower tube to which combustion air A is fed from 6, and communicates with the draft tubes 15a and 15b.
In addition, 17 is a heat exchanger disposed at the upper part of the combustion cylinder main body 10, and 18a and 18b are the nozzles 13a and 18b, respectively.
Stabilizer arranged on the tip side of 13b, 19
20 is an electromagnetic pump that supplies liquid fuel to each of the nozzles 13a and 13b, and 20 is a solenoid valve that controls the liquid fuel in the upper nozzle 13b. These devices 13a, 13b to 20 constitute a pressurized spray burner.

Reference numeral 30 denotes an air guide section, which is formed integrally with the fireproof tube 12 and protrudes in a trapezoidal shape with a flat cross section, and is connected to each of the draft tubes 15a, 15b.
One side surface (a guide surface for combustion air A) 30a extends obliquely upward toward the other side of the combustion tube main body 10.

According to this embodiment, each draft tube 15
The combustion flames B and B' ejected from the draft tubes 15a and 15b reach the ridges 15 at the tips of the respective draft tubes 15a and 15b.
Although it is once pierced by a' and 15b' and ejected, it expands again within the combustion cylinder main body 10.

Here, in this embodiment, as described above, the combustion tube main body 1
At the bottom 12a of the refractory tube 12 of No. 0, an air guide portion 30 is provided protruding approximately at the center of the bottom portion 12a, and draft tubes 15a, 15b of the air guide portion 30 are provided.
Since the side guide surface 30a extends obliquely upward toward the other side of the combustion tube main body 10, the combustion air fed to the bottom 12a side of the refractory tube 12 is
A' is guided by the guide surface 30a of the air guide section 30 and flows obliquely upward. This results in
Combustion flame B ejected from the draft tube 15a
An air flow passage is formed between the bottom portion 12a and the bottom portion 12a;
Contact between the combustion flame B and the bottom portion 12a is prevented.

In addition, the combustion air guided diagonally upward
A' causes the combustion flame B to converge from below, thereby preventing the combustion flame B from being disturbed.

In the above embodiment, the air guide portion 30 is formed integrally with the bottom portion 12a of the refractory tube 12, but the second
As shown in Figure a, an air guide part 31 formed in a flat trapezoidal cross section may be adhered to the flat bottom part 12a, or as shown in Figure 2b, the bottom part 12a may be bonded to the bottom part 12a. The air guide portion 32 may be formed by expanding into a trapezoidal shape with a flat cross section. Also,
In the above embodiment, there are nozzles 13a and 13b in two stages, upper and lower.
However, when only one nozzle or three or more nozzles are provided (none of which are shown), the combustion flame of the burner will be converged by the combustion air.

(Effects of the invention) As explained above, according to the invention, the combustion air flowing through the bottom of the combustion tube main body flows diagonally upward by the guide surface of the air guide part, and the air is slanted upward by the crest of the draft tube. Since the combustion flames that have been burned are converged again from below, the combustion flames do not come into contact with the bottom, which has the advantage of preventing thermal damage to the combustion cylinder body. Further, since the combustion flame is stabilized by convergence, there is an advantage that carbon monoxide and hydrocarbons are not generated to cause incomplete combustion, and soot and carbon are not generated.

[Brief explanation of the drawing]

The drawings serve to explain the present invention, and FIGS. 1 and 2 a and b show an embodiment of a combustion cylinder of a water heater or the like according to the present invention, and FIG. 1 is a sectional view showing the water heater, FIG. 2a is a partially cutaway perspective view showing another first example of the main part, FIG. 2b is a partially cutaway perspective view showing another second example of the main part, and FIG. It is a sectional view showing a conventional water heater. In the figure, 10... combustion cylinder body, 12a... bottom,
13a, 13b... nozzle, 15a, 15b...
Draft tube, 15a', 15b'...crest part,
30, 31, 32... air guide section, 30a...
Guide surface, A, A'... Combustion air.

Claims (1)

[Claims for Utility Model Registration] (1) A pressurized spray burner in which combustion air is fed into a draft tube in which a nozzle is arranged, and a bottomed combustion tube body, the tip of the draft tube being In the combustion tube of a water heater, etc., which penetrates the side wall of the combustion tube main body and faces into the combustion tube main body, and has a ridged part formed at the tip of the draft tube extending toward the inside of the draft tube, An air guide portion is provided at least at one location opposite to the draft tube from approximately the center of the bottom of the combustion cylinder main body, and an air guide portion is provided on the draft tube side of the air guide portion on the opposite side to the draft tube. A combustion tube for a water heater or the like, characterized in that a guide surface is provided that extends obliquely upward and guides a portion of the combustion air. (2) A combustion tube for a water heater or the like as set forth in claim 1 of the utility model registration claim, characterized in that the air guide portion is formed integrally with the bottom of the combustion tube body. (3) A combustion tube for a water heater or the like as set forth in claim 1 of the utility model registration claim, characterized in that the air guide portion is separately formed and the air guide portion is attached to the bottom of the combustion tube body.