JPH0596719U - Burner - Google Patents

Abstract

(57) [Abstract] [Purpose] A wall for combustion surface formation and a flame port for ejecting fuel gas upward along the combustion surface of the wall body are provided, and fuel gas is ejected from the vicinity of the flame port. In the burner in which the air supply holes for secondary combustion that extend in the direction of the slit for the secondary combustion are arranged alternately with the flame openings, even if the temperature rise becomes larger than usual, the wall body Should be able to prevent bending. A notch a penetrating from the upper end of at least one of the plurality of air supply holes 5 to the upper end of the wall 3 is formed in the wall 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 According to the present invention, a wall body for forming a combustion surface is provided, and flame openings for ejecting fuel gas upward are arranged in parallel with the wall surface along the combustion surface of the wall body. The burner is formed in the wall body such that air supply holes for secondary combustion that extend in a slit shape in the jet direction of the fuel gas are arranged alternately with the flame openings.

[0002]

[Prior Art]

 The wall body expands in the lateral length due to a temperature rise caused by combustion. This expansion becomes larger toward the upper side of the wall body. By the way, the left and right ends of the wall body are fixed so as not to move laterally. Therefore, a lateral compressive stress acts on the wall body due to the expansion of the wall body in the lateral direction. Due to this compressive stress, the wall may be curved. Therefore, conventionally, by bending the upper end side of the wall body to the back surface side of the combustion surface to increase the mechanical strength, the wall body is prevented from being curved.

[0003]

[Problems to be solved by the device]

 When the amount of combustion air supplied is less than the appropriate amount, the temperature rises more than usual, and the compressive stress on the wall may become excessive. In the above-mentioned conventional technique, there is a possibility that it is not possible to prevent the wall body from bending when the compressive stress becomes excessive. An object of the present invention is to eliminate the above-mentioned conventional drawbacks and prevent the wall body from being curved even when the temperature rises more than usual.

[0004]

[Means for Solving the Problems]

 To achieve this object, the burner according to the present invention is characterized in that the wall is formed with a cutout that extends from the upper end of at least one of the plurality of air supply holes to the upper end of the wall. Is that

[0005]

[Action]

 The lateral length expansion of the wall can be absorbed by the notches. That is, it is possible to prevent the compressive stress from acting on the wall. By the way, it is desirable that the width of the notch be slightly larger than the expansion of the lateral length of the wall body at the upper limit of temperature rise. When there are a plurality of notches, it is sufficient that the sum of the widths of the notches slightly exceeds the expansion of the length.

[0006]

[Effect of the device]

 Even when the temperature rises more than usual, it is possible to prevent the compressive stress from acting on the wall body, so that the wall body can be prevented from bending.

[0007]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 2 and FIG. 3, a box-shaped case 1 is internally provided with an air passage 20 for pressurized air supplied from a fan and a pair of burners 2, and is thus installed in a water heater or the like. U is configured.

Each burner 2 is provided with a pair of combustion surface forming wall bodies 3 facing each other in the front-rear direction. Both left and right ends of the wall body 3 are fixed to the side plate 16, and the upper edge portion of the wall body 3 is engaged with the upward groove of the case 1 so as to be relatively movable. The lower edge of the wall 3 is fixed to the mixing tube 9 described later. A plurality of flame ports 4 for ejecting fuel gas upward are arranged side by side on each of the two walls 3 along the combustion surface (surface). Further, air supply holes 5 for secondary combustion that extend in the slit-like direction from the vicinity of each flame port 4 in the jet direction of the fuel gas are formed in an alternating arrangement with the flame ports 4. As shown in FIG. 1, notches a are formed so as to penetrate from the upper ends of the air supply holes 5 at two locations to the upper end of the wall body 3. The notch a divides the upper half of the wall 3 into three parts having substantially the same width. The width of the notch a is set to 1 mm in consideration of absorbing the expansion of the wall 3 at about 650 degrees Celsius. Reference numeral 11 in the drawing is an auxiliary air jet port. The lateral width of the auxiliary air jet 11 adjacent to the notch a is smaller than the lateral width of the other auxiliary air jets 11.

A supplementary explanation will be added to the route for supplying the fuel gas to each burner 2. Each burner 2 is provided with a mixing tube 9 that communicates with each flame port 4. The fuel gas is jetted and supplied from the gas nozzle 10 toward the suction port 9a of the mixing pipe 9. At this time, the air (primary air for combustion) in the air passage 20 is sucked into the mixing pipe 9 together with the fuel gas. Therefore, the fuel gas mixed with the primary air for combustion is supplied to the flame port 4.

A supplementary explanation will be added to the route for supplying the secondary air for combustion to each burner 2. Secondary air for combustion is supplied from an air chamber 6 formed on the back surface side of the burner 2 through a combustion air supply hole 5. The air is introduced into the air chamber 6 from the air passage 20 through a narrow channel 8a formed by the plate-shaped body 8. That is, the fuel gas is caused to flow along the surface of the wall body 3 and the secondary combustion air is jetted and supplied from the combustion air supply holes 5 extending in a slit shape in the flow direction of the fuel gas to supply the combustion gas. It forms a flame that sticks to the surface of the.

Further, a secondary fuel gas supply pipe 21 is provided below the mixing pipe 9. In the figure, reference numeral 22 is an electromagnetic valve for intermittently supplying the fuel gas to the secondary fuel gas supply pipe 21. That is, when the solenoid valve 22 is opened, the lean mixed gas of the secondary fuel gas ejected from the ejection hole 21a and the secondary air for combustion is supplied to the combustion air supply hole 5. When the solenoid valve 22 is closed, only the secondary combustion air is supplied to the combustion air supply hole 5.

[Other Embodiments] In the above embodiment, two notches a were formed in the wall body 3, but the number of notches a may be one or more. That is, the sum of the widths of the notches a has only to absorb the expansion of the lateral length of the wall body at the upper limit of the temperature rise.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the invention is not limited to the configuration of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a perspective view of a wall body.

FIG. 2 is a front view of the main part of the burner.

FIG. 3 is a side view of the main part of the burner unit.

[Explanation of symbols]

 3 Wall 4 Flame mouth 5 Air supply hole a Notch

Claims (1)

[Scope of utility model registration request] 1. A wall body (3) for forming a combustion surface is provided,
A flame port (4) for injecting fuel gas upward is provided along the combustion surface of the wall body (3) in parallel with the wall body (3), and the fuel gas is discharged from the vicinity of the flame port (4). A burner formed in the wall body (3) such that secondary combustion air supply holes (5) extending in a slit shape in the ejection direction are arranged alternately with the flame openings (4), A burner in which a notch (a) is formed in the wall body (3) so as to penetrate from the upper end of at least one of the plurality of air supply holes (5) to the upper end of the wall body (3).