JP2833644B2 - Burner for flat gas equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas appliance burner mainly used as a heating source of a gas water heater.

[0002]

2. Description of the Related Art On both sides of a main crater of a flat main burner, a sleeve fire burner forming a flat sleeve crater sandwiching the main crater is provided, and fuel gas is supplied from separate nozzles to the main burner and the sleeve fire burner. Burners for supplying flat gas appliances are known. The burners for flat gas appliances are assembled so that many burners are arranged in a row with a certain gap therebetween, and are used for water heaters and the like.

This gas appliance burner burns a fuel-air mixture (hereinafter referred to as an air-rich mixture) leaner in fuel than a fuel-air mixture having a stoichiometric air-fuel ratio at a main crater, and has a stoichiometric air-fuel ratio at a sleeve crater. When a fuel-air mixture richer in fuel than the fuel-air mixture (hereinafter, referred to as a gas-rich mixture) is burned (so-called lean-burn) to burn the whole with a uniform mixture, about 120 ppm of nitrogen oxides are emitted. (NOx) can be reduced to 40 to 60 ppm. Conversely, by burning the gas-rich mixture at the main crater and burning the air-rich mixture at the sleeve crater, low NOx combustion can be achieved in the same manner as described above.

[0004]

However, this type of burner for flat gas appliances has the problem that the flame vibrates at the crater and the noise generated by this vibration is high. An object of the present invention is to provide a burner for a flat gas appliance in which the vibration of the flame at the crater is small and the noise is low.

[0005]

According to the present invention, a sleeve fire burner is provided on both sides of a main crater of a flat main burner to form a flat sleeve crater sandwiching the main crater. A flat gas appliance burner for supplying a fuel gas from a separate nozzle to the main burner, wherein the main burner has an inlet flow path for sucking an air-fuel mixture for combustion from one side of the main burner; An outlet flow path for allowing the mixture to flow out to the main crater provided at an upper end, an intermediate flow path connecting the inlet flow path and the outlet flow path, and a main crater provided in the outlet flow path; A throttle section comprising a gap formed by symmetrically bulging both side walls of the main burner inward so as to uniformize the air-fuel mixture ejected from along the entire width of the main crater;
A flat gas appliance burner comprising: at least four rectifying plates interposed in the outlet flow passage downstream of the throttle unit and dividing the outlet flow passage at substantially equal intervals in the width direction; The lower end of the flat gas appliance employs a burner for a flat gas appliance as a technical means, wherein the inner straightening plate protrudes below the outer straightening plate.

[0006]

In the burner for a flat gas appliance according to the present invention, the distance between the lower end and the upper end of the inner straightening plate is large.
Therefore, the rectifying effect between the inner rectifying plates is large. Therefore, in the central part in the thickness direction of the throttle portion of the jet flow originally flowing into the throttle portion, a mixture having high dynamic pressure and a large flow rate tends to flow and become a main source of disturbance, but due to the rectifying effect, the main crater The flame in is stable and does not produce noise.

[0007]

Next, a gas appliance burner of the present invention will be described with reference to an embodiment shown in the drawings. In this embodiment, a plurality of gas appliance burners are used as a heating source for a water heater.

[Configuration of Embodiment] A plurality of burners 1 for flat gas appliances are arranged and fixed in a frame at predetermined intervals.
Each flat gas appliance burner 1 is composed of a main burner 11 for generating a main flame, and a sleeve fire burner 12 for generating a sleeve flame on both sides of the main burner 11. The main burner 11 includes an elongated main crater 13 and a flat first air-fuel mixture inlet 14 for introducing air-fuel mixture into the main crater 13 from below. Sleeve fire burner 12
Is composed of a flat slit-shaped sleeve crater 15 arranged on both sides of the main crater 13 with a band-shaped space therebetween, and a second air-fuel mixture inlet 16 for introducing air-fuel mixture into the sleeve crater 15 from below.

The main burner 11 has a pair of opposed slit plates 2 forming a main crater 13 and a side wall sandwiching the slit plate 2 at an upper portion to form a first mixture-introducing portion 14 and forms a main crater 1.
And a side wall plate 3 for sucking the air-fuel mixture into the air-fuel mixture 3. The side wall plate 3 is covered with a side wall plate cover 5 which forms a sleeve fire burner 12 together with the side wall plate 3. The side wall plate 3 is formed by bulging a metal plate and bending it so that the metal plate is doubled. The bent portion 31 formed by the bending becomes a lower end and a pair of slit plates 2.
Are formed in a plane-symmetrical shape with an elongate opening 32 (see FIG. 4) sandwiching it.

At the upper part of the side wall plate 3, a bulging ridge 33 bulging inward in the horizontal direction for sandwiching the pair of slit plates 2 is formed. A first binding gap 34 for inserting the end of the slit plate 2 is provided at both ends in the width direction of the upper opening 32 of the side wall plate 3. The upper portion inside the bulge 33, the outer surface 202 of the slit plate 2, and the inner surface 35 above the bulge 33 of the side wall plate 3 form a partition 36 as a blind space surrounding the band-shaped space. In the up-down direction edge portion 37 of the side wall plate 3, two flat plate-like sides are respectively overlapped.

One edge 37 is provided with a notch 38 for attachment at a lower portion, and an overhang portion 39 is provided at an upper portion above one side portion, and the overhang portion 39 is bent and the other edge portion is bent. The upper part of the two sides is crimped on the upper part of the side part. Further, the other edge 37 is provided with an overhang 39 extending downward from the center of one side, and the overhang 39 is bent and overlapped from the center of the other side downward to form two sides. Crimped. Further, spot welding is performed on an upper portion of the one edge portion 37 and a central portion and a lower portion of the other edge portion 37.

The side wall plate 3 has a first air-fuel mixture introducing portion
And a suction portion 300 for the sleeve fire burner 12 for sucking the air-fuel mixture into the sleeve crater 15 are formed to bulge outward. First
The air-fuel mixture introduction part 14 is provided with one edge 37 on the side of the notch 38.
Of the main burner, and a lower flow path 40 extending horizontally from the main burner suction port 4 and curving upward in the vicinity of the other edge 37 (the main burner suction port 4, The lower channel 40 corresponds to the inlet channel of the present invention).
An intermediate flow path 41 having a thickness smaller than that of the lower flow path 40 is provided at an upper portion of the lower flow path 40 and communicates with an upper end of the lower flow path 40 via a horizontal horizontal step 411.

The upper end of the intermediate flow path 41 is connected to the upper end of the intermediate flow path 41 via an inclined step 421, and the other end 3
An upper flow path 42 is provided from 7 to one edge 37 and thinner than the intermediate flow path 41. In the upper part of the upper flow path 42, a tapered outlet 43 whose thickness decreases from one edge portion 37 side to the other edge portion 37 side is formed, and is connected to the main crater 13. The flow path 42, the tapered outlet 43, and the upper part of the side wall plate 3 correspond to the outlet flow path of the present invention, and the tapered outlet 43 corresponds to the throttle part of the present invention).

A sleeve fire burner 12 suction section 300 has a sleeve fire burner 12 suction port 301 provided above the main burner suction port 4, and extends horizontally from the sleeve fire burner 12 suction port 301. And a throat section 310 forming a throat. On the outer surface on both sides of the end of the throat portion 310, slanted elongated flat portions 311 are provided, respectively.
Three small holes 312 for discharging the air-fuel mixture are arranged in the plane portion 311 in a row.

The side wall plate cover 5 is provided with five rectangular punched portions 50 in a row at the center of the metal plate over the entire width, and bulges both sides of the row of the punched portions 50 to perform first expansion. The projection 51 is formed, and both sides of the row of the punched portions 50 are bent to form a substantially U-shaped plane symmetry. The row of punched portions 50 overlaps the upper portion of the side wall plate 3, the main crater 13, the partitioning portion 36, and the sleeve crater 15 are exposed from the punched portion 50, and the first bulging portion 51 covers both side surfaces of the side wall plate 3. In the upper part of the first bulging portion 51,
A second binding gap 56 circumscribing the first binding gap 34 is formed. Then, the flat plate portion 57 at the end of the side wall plate cover 5 overlapping the edge portion 37 of the side wall plate 3 is spot-welded to the side wall plate 3.

The first bulging portion 51 surrounds the side wall plate 3 and forms slit-shaped sleeve craters 15 on both sides of the main crater 13. The first bulging portion 51 has a tapered outlet 43, an upper flow path 42,
The sleeve fire burner 12 is wrapped around the suction part 300 for the sleeve fire burner 12.
The sleeve crater flow path 52 extending from the air inlet 301 to the sleeve crater 15 through the small hole 312 is formed on both sides of the main burner 11, and the second
An air-fuel mixture introduction section 16 is formed. The first bulging portion 51 has a substantially notched circular downwardly convex contour at the center thereof, and a first recess 53 which is in contact with a portion of the upper channel 42 of the side wall plate 3 is provided. 3 and four vertically long second recesses 54 are provided which divide the sleeve crater 15 into five parts in the width direction.

At both ends of the upper part of the first bulging portion 51, there are provided horizontally elongated third recesses 55 which come into contact with the side wall plate 3, respectively. The lower end of the first bulging portion 51 on the side of the intermediate flow path 41 abuts on the horizontal step 411 and overlaps with the intermediate flow path 41 which is thinner than the lower flow path 40, and projects to the side due to the thickness of the side wall plate cover 5. Has been reduced. The slit plate 2 of the main burner 11 is formed by punching and bulging a metal plate and bending it twice to form a front view in FIG. 5A, a rear view in FIG. 5B, and a rear view in FIG.
Is formed as shown in the top view of FIG.

As a result, the slit plate 2 is formed as an outer band-shaped metal plate 20 (rectifying plate of the present invention) which forms the outside of the main crater 13.
And an inner band-shaped metal plate 24 forming the inside of the main crater 13
(Rectifier plate of the present invention). Outer band metal plate 2
0 has four connecting portions 21 connected to the lower edge of the inner band-shaped metal plate 24 at the lower edge. In addition, a vertically extending second bulging portion 22 bulging inward is formed at an upper portion of each connecting portion 21, and an inner portion separated from the second bulging portion 22 is formed at an upper portion of each second bulging portion 22. A third bulging portion 23 bulging in the vertical direction is formed at the same height as the second bulging portion 22 and reaches the upper edge.

The inner band-shaped metal plate 24 is formed of the outer band-shaped metal plate 2.
The height is higher than 0, the upper edge is aligned with the upper edge of the outer band-shaped metal plate 20, and the lower edge is located at a position extended below the lower edge of the outer band-shaped metal plate 20. The inner band-shaped metal plate 24 has a fourth bulging portion 25 having a circular contour bulging inward at an upper portion of each connecting portion 21. In addition, a fifth vertically protruding portion 26, which protrudes inward and separates from the fourth protruding portion 25, is formed at the same height as the fourth protruding portion 25 above the fourth protruding portion 25. It has reached the upper edge. Further, a sixth bulging portion 27 having a vertically elongated contour is provided at a position slightly below the center in the vertical direction between the connecting portions 21 in the fourth and fifth bulging portions 2.
It is formed at a height lower than 5,26. Further, at both ends in the width direction of the main crater 13 of the inner band-shaped metal plate 24, protruding plates 28 for inserting into the first binding gap 34 are provided.

The inner surface of the second bulging portion 22 contacts the outer surface of the fourth bulging portion 25, and the inner surface of the third bulging portion 23 contacts the outer surface of the fifth bulging portion 26. Thereby, between the outer band-shaped metal plate 20 and the inner band-shaped metal plate 24, five vertical outer inner crater passages 29 communicating with each other in the horizontal direction at the center are formed. Further, the inner band-shaped metal plates 24 of the respective slit plates 2 are in contact with each other, so that the fourth bulging portions 25 and the fifth bulging portions 26 abut with each other and communicate with the lower edge and the central portion in five vertical directions. The inside crater flow path 200 is formed. The inner crater inner flow path 200 is composed of two vertical flow paths 201 by the opposed sixth bulging portion 27.

[Operation and Effect of the Embodiment] The flat gas appliance burner 1 of the embodiment is provided with an upper passage 42 of the main burner 11.
And the tapered outlet 43 guide the air-fuel mixture to the main crater 13 so that the flow rate becomes uniform. Since the flow paths in the main crater 13 communicate with each other in the longitudinal direction, the flow rate of the air-fuel mixture flowing into the main crater 13 is made uniform so that the bias is further reduced.
Further, since the main crater 13 is divided into five parts and the sixth bulging portion 27 is added, the flow path of the air-fuel mixture in the main crater 13 is elongated in the vertical direction, and the flow of the air-fuel mixture is rectified in the vertical direction.

Further, the lower edge of the inner strip-shaped metal plate 24 is located at a position extending downward to near the lower end of the tapered outlet 43. In the space between the lower edges of the inner strip-shaped metal plates 24, the mixture having a large dynamic pressure at the center in the thickness direction of the flow path of the mixture flows and the mixture having a large flow rate flows (the dynamic pressure distribution p in FIG. 6E). (See References). In the present embodiment, the space between the lower edges of the inner band-shaped metal plate 24 has a large distance from the upper end of the inner band-shaped metal plate 24. Thereby, the effect of rectifying the air-fuel mixture between the inner strip-shaped metal plates 24 in the vertical direction is enhanced. From the above, the flame of the main crater 13 is straight in the vertical direction. For this reason, the flame of the main crater 13 is stabilized by suppressing the occurrence of the lift, the disappearance of the lift, and the vibration due to the lateral swing. Therefore, the generation of noise at the main crater 13 is extremely small.

Further, since the first recess 53 is provided in the side wall plate cover 5, the mixture from the sleeve crater flow path 52 to the sleeve crater 15 becomes uniform, and the sleeve crater 15 is divided into five parts. Vibration of the flame of the crater 15 is also suppressed. And sleeve crater 1
The flame of No. 5 produces a flame holding effect on the flame of the main crater 13 by the partition portion 36. Due to this flame holding effect, the flame of the main crater 13 is further stabilized, and the generation of noise is extremely small.

[Modification] The number of the fourth bulging portions 25 or the fifth bulging portions 26 is not limited to four and may be an arbitrary plural number. Sixth
The bulging portion 27 is located between the fourth bulging portions 25 or the fifth bulging portion 26.
A plurality may be provided between them. The sixth bulging portion 27 is the fourth bulging portion.
The sixth bulging portions may be formed at the same height as the bulging portions 25 and 26, and the opposing sixth bulging portions may be in contact with each other. The shape, position, and number of the first recesses 53 may be appropriately changed so as to promote uniform supply of the air-fuel mixture to the sleeve crater 15.

[Brief description of the drawings]

FIG. 1 is a perspective view of a burner for a flat gas appliance.

FIG. 2 is a front view of a side wall plate and a side wall plate cover.

FIG. 3 is a front view of a burner for a gas appliance.

FIG. 4 is a plan view of a gas appliance burner.

FIG. 5 is a three-sided view of a slit plate.

6 is a diagram showing a cross section taken along line AA of FIG. 3 and a dynamic pressure distribution of an air-fuel mixture.

FIG. 7 is a sectional view taken along line BB and CC of FIG. 3;

FIG. 8 is a sectional view taken along line DD of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Burner for flat gas appliances 4 Inlet for main burner (inlet flow path) 11 Main burner 12 Sleeve fire burner 13 Main crater 15 Sleeve crater 20 Outer band metal plate (rectifying plate) 24 Inner band metal plate (rectifying plate) 33 Expansion Protrusion (throttle section) 40 Lower flow path (inlet flow path) 41 Intermediate flow path 42 Upper flow path (outlet flow path) 43 Tapered outlet (throttle section)

Claims (1)

(57) [Claims] Claims: 1. A sleeve fire burner is provided on both sides of a main crater of a flat main burner to form a flat sleeve crater sandwiching the main crater;
What is claimed is: 1. A flat gas appliance burner for supplying fuel gas from separate nozzles to a main burner and a sleeve fire burner, wherein the main burner has an inlet flow for sucking a combustion mixture from one side of the main burner. A flow path; an outlet flow path for allowing the mixture to flow to the main crater provided at the upper end of the main burner; an intermediate flow path connecting the inlet flow path and the outlet flow path; And a throttle formed by symmetrically bulging both side walls of the main burner inward so that the air-fuel mixture ejected from the main crater is made uniform along the entire width of the main crater. A flat gas appliance burner, comprising: a portion; and four or more rectifying plates interposed in the outlet flow passage downstream of the throttle portion and partitioning the outlet flow passage at substantially equal intervals in the width direction. At the lower end of each current plate, the inner current plate is the outer current plate. Ri burner flat gas appliances, characterized in that projects downward.