JPH0311214A - Combustion equipment - Google Patents

Abstract

PURPOSE:To facilitate the manufacture of a burner plate and improve combustion by integrally forming guide cylinders with the burner plate in such a way that guide cylinders are projected from the surface of the burner plate toward a combustion chamber around a number of flame holes for blowing out the secondary air therefrom. CONSTITUTION:A fuel gas is supplied from a nozzle 6 to a mixer 5. At the same time, part of the air supplied to the lower portion of an outer casing 1 from a blower 7 flows into a mixer 4 as the primary air and is mixed with the fuel gas. A resultant mixture is blown out from a nozzle head 8 into a combustion chamber 10 between burner plates 9 via a blowout hole 5a and a primary combustion is conducted. The remainder of the air supplied from the blower 7 to the lower portion of the casing 1 flows into a secondary air chamber 11 via a straightening panel 3 as the secondary air. This flows from the secondary air chamber 11 into the combustion chamber 10 via the flame holes 12 of the burner plate 9 and the secondary combustion of the fuel gas is conducted in the combustion chamber 10. Since the secondary combustion air has the improved directionality of a blowout by passing the guide cylinder 13 of the flame holes 12, the secondary combustion air is sufficiently mixed with the unburnt fuel gas, resulting in the satisfactory combustion. The guide cylinder 13 can be easily manufactured by a press working or the like.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a burner plate forming a combustion chamber downstream of a burner head, and blows out secondary air onto the burner plate. This invention relates to a combustion device in which a flame hole is formed.

(Prior art) Conventionally, burner plates forming a combustion chamber are provided facing each other in the wake of a burner head that blows out a mixed gas of fuel gas and primary air, and flame holes are installed in the burner plates to blow out secondary air. In combustion devices such as semi-Bunsen burners, the flame hole for blowing out secondary air may be a simple circular hole in the burner plate or a flame hole in the burner plate as shown in Japanese Patent Application Laid-Open No. 63-247514. Some types have many vertically long slits.

(Problem to be Solved by the Invention) However, if the flame holes are simply formed in a circular shape, the flame holes are close to each other, resulting in a narrow combustion area. There is an interlayer where the size increases. Furthermore, in order to maintain good combustion, a large amount of primary air is required, making it impossible to increase the turndown ratio.

In addition, when a burner plate is formed with a large number of vertically elongated slits, it becomes difficult to process the burner plate, its strength is low, and vibrations are likely to occur.

The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a combustion device in which the burner plate can be easily processed and the combustion is good.

[Structure of the Invention (Means for Solving the Problems)] In order to achieve the above object, the present invention provides secondary In a combustion device in which burner plates each having a large number of flame holes for blowing out air are provided facing each other to form a combustion chamber, a burner plate protrudes from the burner plate surface toward the combustion chamber around the flame holes of the burner plate. The guide cylinder portion is formed integrally with the burner plate.

(Function) According to the above configuration, the flame hole of the burner plate is integrally formed with the guide tube that protrudes from the burner plate surface toward the combustion chamber side around the flame hole, so that secondary air can enter the combustion chamber. This improves the directionality when the fuel flows into the fuel tank, resulting in better combustion. Further, this guide cylinder portion can be easily manufactured by press working or the like.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described based on the accompanying drawings.

In FIGS. 1 and 2, reference numeral 1 denotes an outer box of a combustion device of the present invention, such as a refrigerant heater for an air conditioner, which is formed into a long and narrow shape as a whole, and a heat exchanger 82 for heating the refrigerant is provided on the upper part of the outer box. . The inside of the outer box 1 is divided into upper and lower parts by a rectifier plate 3 made of a perforated plate. A long hole 4 is formed in the center of the current plate 3 along the longitudinal direction. A mixer 5 is provided in the outer box 1 below the rectifying plate 3, with a jet port 5a facing the elongated hole 11.

A nozzle 6 for supplying fuel gas into the mixture 85 is provided on the lower side of the outer box 1, and a blower 7 for supplying primary and secondary air into the outer box 1 is provided at the bottom of the outer box 1. is provided. The air blown out from the blower 7 is sent to the rectifier plate 3.
A part of the air flows into the outer box 1 at the lower part of the air box 1, a part of which flows into the mixer 5 as primary air, and the rest is supplied to the upper part of the outer box 1 through the rectifying plate 3 as secondary air.

A nozzle head 8 is arranged above the spout 5a of the mixer 5, and burner plates 9 are provided on both sides of the upper part of the nozzle head 8.
．． 9 are provided facing each other, and a burner plate 9.
A combustion chamber 10 is formed between 9 and secondary air chambers 1 are formed on both sides of the combustion chamber 10.
1 is formed.

A large number of flame holes 12 are formed on the entire surface of the burner plate 9.9 at approximately equal intervals above, below, left and right. This flame hole 12 is formed integrally with the burner plate 9゜9 by pressing, embossing, etc., with a guide cylinder portion 13 protruding from the combustion chamber IO side surface of the burner plate 9゜9 around the flame hole 12. be done. Guide cylinder part 13
is formed to have a protrusion height of about 0.3 to 1111.

Next, the operation of this practical example will be explained.

First, fuel gas is supplied into the mixer 5 from the nozzle 6, and at the same time, a part of the air supplied to the lower part of the outer box 1 from the blower 7 flows into the mixer 4 as primary air, and the fuel gas is mixed in the mixer 5. The gas and primary air are mixed and ejected from the nozzle head 8 into the combustion chamber 10 between the burner plates 9, 9 through the ejection port 5a, where they are subsequently combusted. On the other hand, the rest of the air supplied to the lower part of the outer box 1 from the air blower R7 flows into the secondary air chamber 11 through the rectifying plate 3 as secondary air, and from there flows into the secondary air chamber 11 through the burner plate 9.
．． The fuel gas flows into the combustion chamber 10 through each flame hole 12 of 9, and the fuel gas is secondary combusted there. This secondary combustion air passes through the guide cylindrical part 13 of the flame hole 12, and the directionality of the injection is enhanced, so that it mixes well with the unburned fuel gas, and is relatively more efficient than the conventional circular hole. Since the secondary flame F2 is formed at a position away from the flame holes 12, even if the distance between the flame holes 12 is small, the burner plates 9, 9 are not heated excessively, and their durability can be improved. can.

3 and 4 show another embodiment of the present invention, in which flame holes 1 are formed in a burner plate 99 forming a combustion chamber 10.
4, the upper flame hole 14a is simply a circular hole, and only the lower flame hole 14b is formed with a guide tube 15. In this example, the complete combustion area during large combustion can be enlarged. When combustion is low, the contact between unburned gas and secondary air in the area where combustion has been completed (upper stage side) can be accelerated.

Further, the flame holes 14a consisting of the circular holes in the upper stage may be arranged in a staggered manner as shown in the figure.

Note that although the illustrated example shows an example in which the entire device is arranged vertically, the entire device may be arranged horizontally.

[Effects of the Invention] As is clear from the above description, the present invention exhibits the following excellent effects.

(1) By integrally forming a guide cylinder protruding toward the combustion chamber in the flame hole of the burner plate, secondary combustion is improved, the burner plate can be efficiently cooled, and durability is improved.

(2) The burner plate can be easily processed and is compact.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG.
FIG. 3 is a sectional view of a main part showing an embodiment of the pond of the present invention, and FIG. 4 is a side view of FIG. 3. In the figure, ■ is an outer box, 5 is a mixer, 8 is a nozzle head, 9 is a burner plate, 10 is a combustion chamber, 11 is a secondary air chamber, 12.1
4a is a flame hole, and 13.15 is a guide tube. Fourth

Claims (1)

[Claims] 1. On both sides of the downstream side of the burner head that spews out a mixed gas of fuel gas and primary air, burner plates with numerous flame holes that spew out secondary air are placed facing each other to form a combustion chamber. In the combustion device, around the flame hole of the burner plate,
A combustion device characterized in that a guide cylinder portion protruding from a burner plate surface toward a combustion chamber is formed integrally with the burner plate.