JP2873048B2 - Water heater burner device - Google Patents

Description

The present invention relates to a burner device used for domestic oil hot water heaters and the like.

(B) Conventional art Conventionally, as one form of a burner device of a water heater, there is a burner device of a downward fuel injection type as shown in FIG.

As shown in the figure, the burner device X has a lower part of a cylindrical burner main body 101 connected to an upper part of a heat exchanger Y via a burner mounting plate 100, and further into the cylindrical burner main body 101, facing downward. An extending combustion nozzle 102 is provided, and the periphery of the nozzle 102 is used as a combustion chamber 103.

Further, the cylindrical burner main body 101 is configured by arranging the combustion cylinder 101b concentrically inside the outer cylinder 101a, forming a combustion chamber 103 inside the combustion cylinder 101b, and forming the combustion chamber 103 inside the outer cylinder 101a. An annular air flow path 104 is formed between the combustion chamber 101b and an air supply cylinder 105 connected to an air supply fan (not shown).

Further, a large number of small-diameter air inflow through holes 106 are provided in several rows at the end of the combustion cylinder 101b.

With this configuration, the combustion air forcedly supplied by the driving of the air supply fan flows into the cylindrical burner main body 101, and is then divided into temporary combustion air and secondary combustion air, respectively. The air in the air flow path 104 flows into the combustion chamber 103 through the air inflow through hole 106, and the fuel from the combustion nozzle 102 is ignited by the ignition plug 107. As a result, combustion in the combustion chamber 103 is performed.

(C) Problems to be solved by the invention However, such a burner device for a water heater has the following problems to be solved.

That is, in the combustion in the combustion chamber 103 described above, the combustion cylinder 1
Since the tip of 01b is exposed to the highest combustion temperature, it is usually formed of a material having high heat resistance, such as stainless steel.

However, when the required heat load is normal, this is not a problem, but when the required heat load is small, the amount of oil to the combustion nozzle 102 decreases, and the calorific value of the burner also decreases. The combustion cylinder 101b is cooled by the air, so that the air in the combustion cylinder 101b is excessively cooled, resulting in incomplete combustion, soot adhering to the inner surface of the combustion cylinder 101b, and the subsequent combustion is deteriorated. Was.

An object of the present invention is to provide a burner device for a water heater that can solve the above-described problems.

(D) Means for Solving the Problems According to the present invention, a lower portion of a cylindrical burner main body is connected to an inlet side of a heat exchanger, and the cylindrical burner main body is concentrically arranged around a combustion cylinder and the combustion cylinder. A burner device for a water heater, which comprises an outer cylinder laminated on the air cylinder, forms an air flow path between the combustion cylinder and the outer cylinder, and can supply secondary air for combustion to the front of the combustion cylinder through the air flow path. The combustion cylinder has a double cylinder structure comprising an outer combustion cylinder and an inner combustion cylinder concentrically arranged with an annular gap in the outer combustion cylinder, between the outer combustion cylinder and the inner combustion cylinder. The outer combustion cylinder and the inner combustion cylinder are provided with a number of outer and inner air inflow holes, respectively, on the surfaces of the outer and inner combustion cylinders. Characterized in that secondary air for use can flow into the combustion chamber formed in the combustion cylinder Pertaining to the burner device of the machine.

Further, according to the present invention, in the above-described configuration, the outer air inflow through hole is aligned with the inner air inflow through hole, and the inner air inflow through hole is larger in diameter than the outer air inflow hole. It also has features.

(E) Function and Effect With the configuration described above, the present invention has the following function and effect.

That is, even if the outer combustion cylinder is cooled by the air passing through the air passage, the cooling of the inner combustion cylinder can be effectively suppressed by the presence of the annular heat insulating space. Even in the case of a small required heat load, it is possible to prevent incomplete combustion and prevent the generation of soot and the adhesion of soot to the inner combustion cylinder, regardless of the fluctuation of the required heat load. The normal combustion can always be ensured, and the secondary air for combustion in the air passage is introduced into the combustion chamber in the combustion cylinder through the air inflow through holes provided on the surfaces of the outer combustion cylinder and the inner combustion cylinder, respectively. , Can be effectively introduced.

Further, by aligning the outer air inflow through hole with the inner air inflow through hole and making the inner air inflow through hole larger in diameter than the outer air inflow through hole, the above-described heat insulating function is sufficiently secured. Meanwhile, the secondary air can more effectively flow into the combustion chamber.

(F) Embodiment Hereinafter, the present invention will be described in detail based on an embodiment shown in the accompanying drawings.

1 and 2 show the overall configuration of a petroleum water heater B having a burner device A according to the present invention.

As shown in the figure, an oil-type water heater B is connected to a heat exchanger 11, a burner device A connected to the upper end of the heat exchanger 11, and an air supply cylinder 12 to the burner device A in a casing 10. It is configured by disposing an air supply fan 13 and exhaust ducts 14 and 15 connected to a lower end of the heat exchanger 11.

In FIG. 3, T is a tank filled with kerosene. When the pump P operates, kerosene from the tank T goes through the filter F and is supplied to the burner device A from the oil pipe U.

Further, the return oil pipe D is connected to the outgoing oil pipe U and the burner device A.
And a part of the kerosene is atomized and ejected into the burner device A, and the rest of the kerosene is returned through the return oil pipe D.

A flow regulating valve E, a filter F1 for removing fine impurities, and a check valve G for preventing kerosene from flowing back to the burner device A are mounted in series in the middle of the return oil pipe D. .

Then, by controlling the flow control valve E, the amount of returned oil can be adjusted, the amount of spray to the burner device A can be increased or decreased, and the amount of combustion can be changed.

Further, the water supply side of the heat exchanger 11 is connected in communication with a water supply pipe H. The water supply pipe H has a water volume sensor S1 and a water temperature sensor.
S2 is installed.

On the other hand, a hot water supply pipe I connected to the hot water supply side of the heat exchanger 11 is provided with a flow control valve J and a hot water temperature sensor S3.

Further, a bath pipe K is branched from the hot water supply pipe I, and a bath water amount sensor S4 and a shut-off valve L are mounted.

Hereinafter, the configuration of the burner device A according to the present invention will be described with reference to FIG. 4 to FIG.

First, the overall configuration of the burner device A will be described with reference to FIGS. 4 and 5. The cylindrical burner main body 20 interposed between the heat exchanger 11 and the air feed cylinder 12 is located inside the combustion chamber 21. A combustion cylinder 24 in which a fuel injection nozzle 22 for injecting fuel downward and a spark plug 23 are disposed, and a primary outer cylinder 25 and a secondary outer cylinder which are disposed concentrically in a layer around the combustion cylinder 24. And a cylinder 26.

In addition, the combustion cylinder 24 has a primary air inflow guide cylinder
28, a large number of primary air inflow holes 30 are provided in a rear end plate 29, and a flame holding cylinder Z is formed at the front end thereof.

Further, a funnel-shaped air guide plate 28a is provided in the primary air inflow guide cylinder 28, as shown in FIG.
The guide plate 28a has an opening with a reduced diameter toward the front, and the opening is arranged toward the primary air inflow hole 30.

Then, the primary air can be smoothly supplied from the air supply cylinder 12 into the combustion chamber 21 through the primary air inflow guide cylinder 28 and the primary air inflow hole 30.

On the other hand, between the combustion cylinder 24 and the primary outer cylinder 25, an annular secondary air flow path 31 is formed, and the annular secondary air flow path 31 is provided on the peripheral surface of the flame holding cylinder Z. Numerous secondary air inlets
Through 32, it communicates with the combustion chamber 21 formed in the flame holding tube Z.

With this configuration, secondary air can be supplied from the air supply cylinder 12 into the combustion chamber 21 through the annular secondary air flow path 31 and the secondary air inflow through hole 32.

In addition, a tertiary air passage 33 is formed between the primary outer cylinder 25 and the secondary outer cylinder 26, and an opening at the end of the tertiary air passage 33 communicates with the internal space 34 of the heat exchanger 11. doing.

Further, a heat insulating box s is attached to a connection plate 11a for connecting the cylindrical burner main body 20 to the heat exchanger 11, and the heat insulating space s formed in the box s allows the heat to be transmitted to the cylindrical burner main body 20. It is configured to block heat transfer.

Further, as shown in FIG. 4, a connecting portion between the cylindrical burner main body 20 and the air supply cylinder 12 is provided with an air flow path switching damper device C.
Are arranged.

Then, by such an air passage switching damper device C, as shown in FIG. 6, the primary air in proportion to the required heat load described above, the air amount of the secondary air and tertiary air Q _1, Q _2, Q ₃ Can be adjusted.

According to the present invention, in the above-described configuration, the configuration of the combustion cylinder 24 is such that the temperature of the combustion chamber 21 can be prevented from lowering even in the state of a small required heat load, thereby ensuring stable combustion. It has features.

That is, as shown in FIGS. 7 and 8, the flame holding cylinder Z formed at the tip of the combustion cylinder 24 has an outer combustion cylinder 24a having a hollow circular section and an annular gap in the outer combustion cylinder 24a. It has a double cylinder structure consisting of an inner combustion cylinder 24b which is opened and arranged concentrically.

With such a double cylinder structure, an annular heat insulating space 24c can be formed between the outer combustion cylinder 24a and the inner combustion cylinder 24b.

On the other hand, the air inflow through-holes 32 provided in the flame holding cylinder Z are formed from a large number of outer and inner air inflow through-holes 32a, 32b provided on the surfaces of the outer combustion cylinder 24a and the inner combustion cylinder 24b, respectively. In addition, secondary air can flow into the combustion chamber 21 through the outer and inner air inflow through holes 32a and 32b and the annular heat insulating space 24c.

Due to the presence of the annular heat insulating space 24c, the outer combustion cylinder 24a
Even if is cooled by the air passing through the annular secondary air flow path 31, the inner combustion cylinder 24b can be prevented from directly contacting the air, so that cooling of the inner combustion cylinder 24b is effectively suppressed. Therefore, the ambient temperature in the combustion chamber 21 can be kept as high as possible.

Therefore, even in the case of a small required heat load, incomplete combustion in the combustion chamber 21 can be prevented, so that generation of soot and adhesion of soot to the inner cylinder can be prevented. Regardless, normal combustion can always be ensured.

In this embodiment, as is apparent from FIG. 7, a part of the inner combustion cylinder 24b is bulged in the radial direction to form a heat insulating space shape retaining piece 24d. The annular heat insulating space 24c is secured by preventing contact with the combustion tube 24b.

Further, as shown in FIGS. 7 and 8, in the present embodiment, the inner air inflow through hole 32b and the outer air inflow through hole 32a are aligned, and the diameter of the inner air inflow through hole 32b is set to the outside. By making the diameter larger than the diameter of the air inflow through hole 32a, it is possible to ensure the inflow of the secondary air into the combustion chamber 21 while securing the above-described heat insulating function.

In FIG. 4, a stir plate 53 is attached to the tip of the flame holding cylinder Z, so that the diffusion of the combustion air can be enhanced and the heat exchange rate in the heat exchanger 11 can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional front view of a petroleum water heater equipped with a burner device according to the present invention, FIG.
FIG. 3 is an explanatory diagram of a conceptual configuration of an oil-type water heater, FIG. 4 is an explanatory diagram of an internal configuration of a burner device, FIG. 5 is a cross-sectional view taken along the line II of FIG. 4, and FIG. FIG. 7 is an enlarged explanatory view of a main part of the combustion cylinder, FIG. 8 is a sectional view taken along the line II-II of FIG. 7, and FIG. 9 is a sectional view of a conventional burner device. . In the figure, A: Burner unit Z: Flame holding cylinder 11: Heat exchanger 12: Air supply cylinder 13: Air supply fan 20: Cylindrical burner body 21: Combustion chamber 22: Fuel ejection nozzle 23: Spark plug 24: Combustion cylinder 24a : Outer combustion cylinder 24b: Inner combustion cylinder 24c: Annular insulated space 32: Air inflow through hole 32a: Outer air inflow hole 32b: Inner air inflow hole

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shigefumi Yasunaga 431-1 Uozakihama-cho, Higashinada-ku, Kobe-shi, Hyogo Prefecture Inside Nippon Yupro Co., Ltd. (56) References JP-A-1-305212 (JP, A) JP-A-60-101522 (JP, U) JP-A-3-128220 (JP, U) (58) Fields surveyed ( Int.Cl. ⁶ , DB name) F23D 11/24

Claims (2)

(57) [Claims] 1. A lower part of a cylindrical burner body (20) is connected to an inlet side of a heat exchanger (11), and the cylindrical burner body (20) is connected to a combustion cylinder (24) and the combustion cylinder (24). ) And an outer cylinder (25) stacked concentrically around the combustion cylinder (24) and the outer cylinder (2
5) An air flow path (31) is formed between the air flow paths (31).
In a burner device of a water heater capable of supplying secondary air for combustion to the front of the combustion cylinder (24), the combustion cylinder (24) is placed in the outer combustion cylinder (24a) and in the outer combustion cylinder (24a). The inner combustion cylinder (24b) is concentrically arranged with an annular gap. The inner combustion cylinder (24b) has a double cylinder structure, and an annular heat insulating space (24) is provided between the outer combustion cylinder (24a) and the inner combustion cylinder (24b).
c), and a number of outer and inner air inflow through holes (32a) (32b) are provided on the surface of the outer combustion cylinder (24a) and the inner combustion cylinder (24b), respectively. A burner for a water heater, characterized in that secondary air for combustion in an air flow path (31) can flow into a combustion chamber (21) formed in a combustion cylinder (24) through a through hole (32). apparatus. 2. The outer air inflow through hole (32a) is aligned with the inner air inflow through hole (32b), and the inner air inflow through hole (32b) is moved from the outer air inflow through hole (32a). The burner device for a water heater according to claim 1, wherein each of the burners has a large diameter.