JPS63156910A - Burner - Google Patents

Abstract

PURPOSE:To suppress the disturbance of secondary air by providing a laminated smoothing plate comprising a porous plate and honey-comb grid at the upstream of a secondary air port with the honey-comb grid positioned at the downstream. CONSTITUTION:Since secondary air is compulsorily supplied from the end surface of a secondary air chamber 17, the flows of secondary air are irregular. However, in the upstream zone of a secondary air port 18, the flows of secondary air are all smoothed by the honey-comb grid 20 at the downstream side of the porous plate 19. Since the porous plate 19 at the downstream side is partitioned in small spaces by the honey-comb grid 20, a rapid expansion thereof is suppressed so that the disturbance at the edges of the porous plate 19 is reduced. Therefore, the secondary air having small disturbance at the edges of the porous plate 19 is reduced. Therefore, the secondary air having small disturbance is supplied to a secondary air port 18 and a flame is stabilized and a noise is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a combustion apparatus which is designed to reduce the noise of combustion equipment.

BACKGROUND OF THE INVENTION Conventionally, this type of combustion device has a fan (
Combustion air is supplied by a combustion chamber (not shown), and part of the air is supplied to the mixing chamber 1 (the flow is shown by a dashed-dotted line arrow), and the rest is used as secondary air (hereinafter referred to as v2) (the flow is shown by a solid line arrow). The air flows through the chamber 2 and is supplied through the secondary air port 3 to the flame formed at the flame port 4 provided on the downstream side of the mixing chamber 1. Further, for the purpose of rectifying the air flow v2 and suppressing disturbance, a perforated plate 5 consisting of a large number of small holes was disposed upstream of the secondary air port 3.

Problems to be Solved by the Invention However, in the above configuration, after v2 passes through the small holes of the perforated plate 5, disturbance occurs at the edge part due to rapid expansion, and the thickness of the perforated plate 5 is too large. Because it is thin, the direction of v2 is not controlled and it enters the secondary air port 3 in the direction of flow on the upstream side of the perforated plate 5, causing turbulent flame and increased combustion noise. In addition, in order to increase the rectification effect, the thickness of the perforated plate 5 can be increased or the perforated plate 5 can be stacked in several stages, but since the perforation ratio of the perforated plate 5 is small, the pressure drop will increase and the insecticide passing through the small holes will This has the problem of increasing fluid noise and fan noise.

The present invention solves the conventional problems, and aims to stabilize the flame and reduce combustion noise by rectifying V2 on the upstream side of the secondary air port and suppressing turbulence, thereby reducing equipment noise. shall be.

Means for Solving the Problems In order to solve the above-mentioned problems, the combustion apparatus of the present invention is provided with a flame port on the downstream side of the mixing chamber, and a secondary air chamber that serves as a flow path of v2 around the mixing chamber. , in a burner body consisting of a secondary air port that communicates the flame port and the secondary air chamber and blows out V2, a rectifier plate in which a perforated plate and a honeycomb lattice are superimposed on each other upstream of the secondary air port; The honeycomb lattice is located on the downstream side.

Effects According to the above-described structure of the present invention, after v2 passes through the perforated plate, the outlet is partitioned into one small space by the honeycomb lattice, so that rapid expansion is not suppressed and turbulence at the edge portion is reduced. Further, since a honeycomb lattice with a large opening area and an appropriate length in the direction of flow is disposed on the downstream side, all flows are controlled in the same direction by the walls of the honeycomb lattice without any increase in pressure loss.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. In FIGS. 1 and 2, 10 is a fan for supplying combustion air, which is connected to the burner body 13 together with fuel g12 having a nozzle 11 at its tip. The burner body 13
is equipped with a mixing chamber 14 for mixing fuel and air, a flame port 15 on the downstream side thereof, a secondary air chamber 17 surrounded by an outer case 16, and the flame port 15 and the secondary air chamber 17 It is composed of a secondary air port 18 that communicates with A honeycomb lattice 20 is arranged on the downstream side of the perforated plate 19.

In the above configuration, since the secondary air v2 is forcibly supplied from the end face of the secondary air chamber 17, the flow direction is different in each part, and it also enters the perforated plate 19 at non-uniform angles and flows out through the small holes. However, the honeycomb lattice 20 installed on the downstream side
Therefore, all the flows are rectified in the same direction in the upstream region of the secondary air port 18. Furthermore, since the downstream side of the perforated plate 19 is partitioned into one small space by the honeycomb lattice 20,
Sudden expansion is suppressed, and disturbances at the joint portion of the perforated plate 19 are reduced. As a result, since the rectified and less turbulent v2 is supplied to the secondary air port 18, a stable flame is formed and noise during combustion is reduced.

Furthermore, as shown in FIG. 3, by providing the pressure equalizing ports 22 in the perforated plate 19, the size of v2 ejected from the secondary air port 18 can be made uniform at the same time, and one rectifying plate 2
1, it has the effects of rectification, pressure equalization, and turbulence suppression.

Effects of the Invention As described above, the combustion apparatus of the present invention provides the following effects.

(1) By installing a rectifying plate made of a perforated plate and a honeycomb lattice on the upstream side of the secondary air port so that the honeycomb lattice side is located on the downstream side, v2 suppresses the turbulence that occurs at the edge after passing through the perforated plate. Moreover, all flow directions are controlled in the same direction. As a result, stable v2 can be supplied to the flame port, the flame is stabilized, and combustion noise is reduced.

(2) By providing a pressure equalization port in the porous plate, the size of v2 is made uniform, and it is possible to perform flow rectification, pressure equalization, and turbulence suppression in a small space.

(3) By using a honeycomb lattice with a large aperture ratio,
Flow can be rectified without installing multiple layers of perforated plates, and as a result, increases in pressure loss can be suppressed, and fluid noise and fan noise do not increase.

[Brief explanation of the drawing]

FIG. 1 is a schematic front cross-sectional view of a combustion device according to a first embodiment of the present invention, FIG. 2 is a side cross-sectional view of the first embodiment of the present invention, and FIG. FIG. 4 is a front sectional view of a main part, and FIG. 4 is a side sectional view of a conventional combustion device. 14...Mixing chamber, 15...Fire outlet, 17
...Secondary air chamber, 18...Secondary air port, 19...Perforated plate, 2o...Honeycomb lattice, 21... rectifier. Name of agent: Patent attorney Toshio Nakao and 1 other person l3
-Bar 1 embroidery/4-Mixed! 15- Enguchi 77- Nine hope! Fig.1

Claims (2)

[Claims] (1) A flame port is provided on the downstream side of the mixing chamber, and a secondary air chamber serving as a secondary air flow path is provided around the mixing chamber, and the flame port and the secondary air chamber are communicated with each other to blow out secondary air. A combustion device comprising: a rectifier plate in which a perforated plate and a honeycomb lattice are stacked on top of each other, upstream of the secondary air port of a burner body having a secondary air port that allows the honeycomb lattice to be located on the downstream side. (2) The combustion device according to claim 1, wherein the porous plate is provided with a pressure equalization port.