JPH07280221A - Burner and combustion apparatus using the same - Google Patents

Abstract

PURPOSE:To provide a burner having a flat surfacelike burner port plate which can be reduced in size and a combustion apparatus which uses the same burner. CONSTITUTION:A burner 4 comprises a mixer 3 for mixing fuel gas with the air, and a flat surfacelike burner port plate 1 having a plurality of burner ports 2 disposed on the downstream side of the mixer 3, wherein the mixer 3 is divided into a plurality of mixing units 3A, 3B, and burner ports 2 group on the one plate 1 are disposed corresponding to positions of the units.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burner used in a domestic gas hot water supply apparatus and a combustion apparatus using the burner.

[0002]

2. Description of the Related Art FIG. 2 is a perspective view of a conventional gas burner having a flat flame nozzle plate, and FIG. 3 is a sectional view of a combustion apparatus using this burner. This burner 4 is composed of a mixing section 3 for mixing fuel gas and air and a flat flame nozzle plate 1 having a plurality of flame nozzles 2 arranged downstream thereof. 1 is composed of one sheet. The combustion device has a plurality of the burners 4 and a burner chamber 5 for accommodating the burners 4,
It is composed of a combustion chamber 6, a heat exchanger 7, an exhaust chamber 8 and a blower 9, which are surrounded by an exterior 10. When the fuel jets out into the burner 4 and the combustion air 20 is introduced into the burner chamber 5 by the blower 9, the fuel gas 30 is premixed in the mixing section 3 of the burner 4, and the flat flame tip plate. It is ejected from the flame port 2 on the upper part 1 and burns to form a flame. The high-temperature combustion gas 40 generated by combustion passes through the heat exchanger 7 and heats the heated body 50 there. Then, the combustion gas 40 whose temperature has dropped due to heat exchange is used as the exhaust gas 50.
Is released from the outside. Further, in order to control the temperature of the object to be heated, the amount of fuel and the number of burners 4 to be burned are determined.

[0003]

[Problems to be Solved by the Invention] In the domestic gas hot water supply equipment, it is necessary to finely control the temperature of discharged hot water. For this reason,
A burner capable of excellent combustion in a wide range of turndown ratio (combustion amount adjustment range) is required. However, the range of the turndown ratio of the burner alone is generally smaller than 1 to 1/3. For example, in the case of a water heater with a hot water discharge capacity of 16, the gas input 3
It is impossible to satisfactorily burn with a single burner in the range of 0,000 to 5,000 kcal / h. Therefore, in a domestic gas water heater, a plurality of burners 4 are mounted as shown in FIG. 3 and the burners 4 are switched to be used, whereby an apparent turndown ratio is secured. Particularly, in the case of the burner 4 including the flat flame nozzle plate 1 and the mixing section 3, the turndown ratio of the burner cannot be 1 to 1/3, and the limit is 1 to 1 / 2.7. Therefore, conventionally, three or more burners are mounted, which causes a problem that the combustion device becomes large. It is an object of the present invention to solve this problem and provide a burner having a flat flame port plate that can be miniaturized and a combustion device using the burner.

[0004]

DISCLOSURE OF THE INVENTION The present invention relates to a mixing section for mixing a fuel gas and air, and a burner having a flat flame nozzle plate having a plurality of flame openings arranged downstream of the mixing section. The present invention relates to a burner in which the flame nozzles on one flame nozzle plate are arranged corresponding to the positions of the plurality of mixing portions, and a combustion apparatus using the burner. In the present invention, the mixing section is divided into a plurality of sections by, for example, a partition plate, and the group of flame openings on one flame opening plate is referred to as a group of a plurality of flame openings (hereinafter referred to as a flame opening) corresponding to the positions of the plurality of mixing sections. Call it a department).

When the mixing section and the two flame openings arranged at the positions corresponding to the mixing section are two, the two flame openings have a ratio of the total area of the flame openings (for example, the flame of FIG. 1). Mouth 12A
And the total area ratio of the flame nozzle 2 of the flame nozzle portion 12B) is 55: 45-
It is preferable to adjust the number of flame openings and / or the size of the flame openings so that the ratio becomes 65:35 (claim 2) in the following points. In addition, adjustment of the total area ratio of the flame mouth is
The size of the flame openings in both mixing sections should be the same and the number of flame openings should be the above ratio, or the size of the flame openings in both mixing sections should be different (even if the number of flame openings is the same. May be).

Consider, for example, a case where a burner in which two flame openings are arranged on one flame opening plate is attached to a water heater. When the ratio of the total area of the flame openings of the two flame openings is 1: 1 and the water heater has a small hot water supply capacity of 12 or less, the required turndown ratio is 1 to 1 / 4.5 or less. , To ensure this, set the turndown ratio of one flame mouth to 1 to 1.
It should be /2.5 or less. However, in the case of a large-scale water heater of No. 16 or so, the required turndown ratio is 1 to 1
It becomes / 6, and the turndown ratio of the flame mouth part requires 1 to 1/3. This may be controlled such that the ratio of the total area of the flame openings is 55:45 to 65:35 as in claim 2, and the flame opening having the smaller total area of the flame openings is burned even after switching. For example, in the case of No. 16 water heater, even if the turndown ratio of one flame mouth part is 1/1/2 to 1/1/2. 1/6 can be secured.

[0007]

EXAMPLES Examples of the present invention will be described below. FIG. 1 is a perspective view of a burner according to an embodiment of the present invention. This burner 4
Is two mixing sections 3A upstream of one flat flame nozzle plate 1.
And 3B are integrally provided, and the flame openings 12A and 12B are arranged at positions corresponding to the respective mixing portions on the flame opening plate 1, and the flame openings 2 are arranged at the respective flame openings. It is a thing.
The size of the flame openings 2 was the same in both flame openings, and the number of flame openings was 62 for the flame openings 12A and 79 for the flame openings 12B (the total area ratio was 56:44). Although not shown, this burner 4 was incorporated in a water heater No. 16. The basic configuration of the water heater is the same as that of the conventional combustion apparatus shown in FIG. 3, and the burner 4 which has been conventionally mounted in plurality is one. The turndown ratio of the burner portion of this burner was 1 to 1 / 2.5, and the turndown ratio of the water heater could be secured to 1 to 1/6.

[0008]

According to the present invention, the size of the combustion device can be reduced. Also, freely decide the number of flame outlets on the flame outlet plate,
It is possible to change the amount of fuel in a plurality of stages and burn it with one flame nozzle plate, and it is possible to secure a wide turndown ratio of the combustion device. Particularly in the case of household hot water supply equipment, it is possible to finely control the temperature of hot water discharged.

[Brief description of drawings]

FIG. 1 is a perspective view showing a burner according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a conventional burner.

3 is a sectional view of a combustion device using the burner of FIG.

[Explanation of symbols]

1 ... Flame mouth plate, 2 ... Flame mouth, 3 ... Mixing section, 3A ... Mixing section, 3
B ... Mixing section, 4 ... Burner, 5 ... Burner chamber, 6 ... Combustion chamber,
7 ... Heat exchanger, 8 ... Exhaust chamber, 9 ... Blower, 10 ... Exterior,
12A ... Flame tip, 12B ... Flame tip, 20 ... Combustion air,
30 ... Fuel gas, 40 ... Combustion gas, 50 ... Object to be heated, 6
0 ... Exhaust gas

Claims (3)

[Claims] 1. A burner having a mixing section for mixing fuel gas and air and a flat flame nozzle plate having a plurality of flame openings arranged downstream of the mixing section, wherein the mixing section is divided into a plurality of sections. A burner in which a group of flame nozzles on one flame nozzle plate is arranged corresponding to the positions of the plurality of mixing portions. 2. The ratio of the total area of the flame openings in the two flame opening groups on the flame opening plate having two mixing portions and corresponding to the positions of the two mixing portions is 55:45 to 65. The burner according to claim 1, wherein the number of flame openings and / or the size of the flame openings is adjusted so as to be 35. 3. A combustion device using the burner according to claim 1.