JPH10253014A - Gas burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a gas burner for forced combustion type gas apparatus comprising a fan for supplying combustion gas in which combustion stability is enhanced by bending the burner head part to form two rows of bank in the longitudinal direction and making longitudinal slits side by side in the inner opposite faces at both banks thereby preventing flame lift. SOLUTION: The gas burner is manufactured by bending a steel plate, seaming the fringe part and jointing the fringe part hermetically and a pipe for mixing gas and primary air communicates with a burner head part 10. The burner head part 10 is bent to form two rows of bank 12 in the longitudinal direction and an open groove 13 is made between both banks 12. Longitudinal slits 15,... are made in the inner opposite faces 14 at both banks 12 and arranged at a specified pitch. In such a gas burner, mixed gas is mixed, decelerated and dispersed in the open groove 13 and delivered from an upper end open face and a flame formed thereon is burnt stably without being lifted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas burner which is incorporated in a forced combustion type gas appliance which blows combustion air by a fan and which is made of a steel plate in which a lift of a flame is prevented.

[0002]

2. Description of the Related Art In recent years, in household gas appliances such as water heaters and bath kettles, a fan is provided in a supply / exhaust passage of combustion air to forcibly supply combustion air to a gas burner in order to reduce the size and increase the capacity. The forced combustion type that supplies is widespread. Such a forced-combustion gas appliance forms a combustion device by arranging a plurality of gas burners made of steel plates, and the gas burner generally forms a combustion surface by arranging slit flame holes on a burner top.

[0003]

In such a gas burner, gas and primary air are sucked into the mixing tube, and the base of the flame formed on the combustion surface by being ejected from the slit flame hole is lifted from the combustion surface. There is a problem that combustion tends to occur and combustion is not stable. For this reason, means for forming a supplementary flame separately from the main flame to prevent the lift of the flame is used. In order to form the supplementary flame, various gas burners including a flame holding plate provided in a burner head portion are provided. However, the structure is complicated and the manufacturing cost is increased. Also,
Such a complicated structure is not preferable because the household gas appliance is required to be downsized and the installation space for the gas burner is limited.

An object of the present invention is to solve these problems and to provide a gas burner made of a steel plate having a new configuration incorporated in a forced-combustion gas appliance, thereby preventing a lift of a flame and stabilizing combustion. It is another object of the present invention to provide a gas burner that is manufactured to be small and thin.

[0005]

In order to achieve the above object, a gas burner according to the present invention is a steel gas burner to be incorporated in a forced-combustion gas appliance that blows combustion air by a fan, in which a burner head is bent in a concave shape. Two banks are formed in the longitudinal direction, and an opening groove having a predetermined depth is formed between the two banks. Then, slit longitudinal holes formed at predetermined depth positions from the upper end opening surface of the opening groove are formed side by side on the inner facing surfaces of both levee portions. Hereinafter, the configuration of the present invention will be specifically described with reference to the drawings.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a specific embodiment of a gas burner according to the present invention. The gas burners are arranged at predetermined intervals and incorporated in a forced combustion gas appliance to constitute a combustion device for heating a heat exchanger. Is what you do. In the drawings, a gas burner is manufactured by bending a steel plate which has been bulged symmetrically in the left and right direction around a burner head portion (10), folding the edges thereof, and joining them in an airtight manner, and a gas and primary air suction port. And a mixing pipe (2) for mixing the gas and the primary air, the mixing pipe (2) being bent upward and communicating with the burner head (10).

The burner head (10) of this gas burner
Is formed by bending in a concave shape to form two rows of ridges (12) in the longitudinal direction and opening an opening groove (13) having a predetermined depth at the center between both ridges (12). . Both banks (1
A slit vertical hole (15) is formed at a predetermined depth from the upper end opening surface of the opening groove (13) in the inner facing surface (14) of 2), and the slit vertical hole (15) has a predetermined pitch interval. , And are formed so as to face the respective opposing positions of the two opposing surfaces (14).

Next, the combustion of the gas burner will be described with reference to FIG. When the operation switch is turned on, the valve in the gas supply path is opened, and the fan in the supply / exhaust path starts operating. Gas is ejected from the nozzle inserted into the inlet opening (1) into the mixing pipe (2), and primary air is sucked into the mixing pipe (2) from the inlet opening (1), and the gas is mixed with the gas in the mixing pipe (2). The primary air is mixed, and the gas mixture (dotted arrow in the figure) reaches the burner head (10). Here, the mixed gas is diverted to both levee portions (12), blocked by the top wall of the levee portion (12), and opened from the slit vertical hole (15) opened in the opposing surface (14) to the open groove (13). Squirt into the inside. The gas mixture ejected from the opposed slit vertical holes (15) collides in the opening groove (13), is mixed, decelerated, diffuses, and is discharged from the upper opening surface of the opening groove (13), and is discharged to the gas burner side wall. The secondary air rising along is supplied, ignited and burned. In this gas burner, the gas mixture sufficiently mixes and decelerates in the opening groove (13), diffuses and discharges from the upper opening surface, and the flame formed at the upper opening surface stably burns without lifting. I do.

The gas burner of the present invention may be manufactured by expanding a single steel plate symmetrically and bending it around the burner head (10) as in the embodiment shown in the drawing. The burner body with the top opened and the burner head (10) bent in a concave shape and formed as described above are divided and manufactured, and the burner head (10) is put on the burner body and joined integrally. May be produced. Further, the width and depth of the opening groove (13), the position of the slit vertical hole (15),
Parameters such as the pitch interval are appropriately set according to the capacity of the gas burner and the type of gas used.

[0010]

The gas burner of the present invention is formed as described above, and the mixed gas discharged from the slit vertical hole (15) opened in the inner facing surfaces (14) of the two embankments (12) is opened. In (13), since the mixture is sufficiently mixed, decelerated, diffused, and discharged from the upper end opening, the flame formed at the upper end opening can realize stable combustion without lifting. Further, lifting combustion can be suppressed even if the suction amount of primary air is increased more than before, and the present invention is suitable for lean combustion effective for reducing NOx of a gas burner.

Further, unlike the prior art, a member such as a flame holding plate for forming a supplementary flame is not required, so that the structure can be simplified and the manufacturing cost can be reduced, and it is formed small and thin. The installation space is designed to be small, and the household gas appliance can be reduced in size, thickness, and capacity.

[Brief description of the drawings]

FIG. 1 is a cross-sectional perspective view of a burner head of a gas burner according to the present invention, with a portion cut away.

FIG. 2 is a plan view of the gas burner of the present invention.

FIG. 3 is a front view of the gas burner of the present invention.

FIG. 4 is a sectional view of a burner head of the gas burner of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Burner head part 12 Bank part 13 Opening groove 14 Opposing surface 15 Slit vertical hole

Claims (1)

[Claims] 1. A gas burner made of a steel plate to be incorporated in a forced-combustion gas appliance that blows combustion air by a fan. The gas burner is bent in a concave shape to form two rows of ridges (12) in the longitudinal direction. An opening groove (13) having a predetermined depth between
A slit vertical hole (15) opened at a predetermined depth from the upper end opening surface of the opening groove (13) is arranged on the inner facing surface (14) of both bank portions (12), and the burner head portion ( 1
0) The gas burner characterized in that: