JP3128499B2 - 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 burner for a gas appliance used for a water heater or the like, which has reduced noise.

[0002]

2. Description of the Related Art A burner for a gas appliance used for a water heater or the like is provided with a sleeve fire burner forming a flat sleeve crater sandwiching the main crater on both sides of a main crater of the flat main burner.

[0003] Fuel gas is supplied from separate nozzles to the main burner and the sleeve-fire burner, and a fuel-air mixture (hereinafter referred to as an air-rich mixture) having a leaner fuel than a fuel-air mixture having a stoichiometric air-fuel ratio at the main crater. ) To burn a fuel-air mixture (hereinafter referred to as a gas-rich mixture) richer in fuel than a fuel-air mixture having a stoichiometric air-fuel ratio at the sleeve crater (so-called lean-burn). When burned, nitrogen oxides (NOx) emitted about 120 ppm can be reduced to 40 to 60 ppm.

Further, the main crater is provided with four or more slit plates for rectifying an air-rich mixture that produces a light flame having a high combustion speed, and is arranged at equal intervals in parallel with each other.
It is divided into a plurality of flat channels. Further, the flow path of the main burner is located on both sides of the main burner in the thickness direction of the main burner so that the flow rate of the air-rich mixture flowing out from the main crater is evenly distributed in the width direction of the main burner. The aperture is narrowed down from

[0005]

In the burner for a gas appliance having the above-described structure, the flow distribution of the air-rich mixture in the thickness direction perpendicular to the width direction of the main crater is larger toward the center, which causes the vibration of the flame. It was a source of noise. An object of the present invention is to provide a burner for a flat gas appliance with low noise.

[0006]

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;
In a flat gas appliance burner, which is interposed in the outlet flow path downstream of the constricted portion and includes four or more rectifying plates that partition the outlet flow path in the width direction, an interval between the rectifying plates is:
As a technical means, a burner for a flat gas appliance characterized in that the inner side of the main crater is narrower.

[0007]

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

[Configuration of Burner for Gas Appliances] 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. Main burner 11
Consists of 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. The sleeve fire burner 12 includes 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 introducing portion 16 for introducing an air-fuel mixture into the sleeve crater 15 from below. Become.

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 (FIG. 6)
(See (d)). 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. And the upper part inside the bulge 33 and the outer surface 202 of the slit plate 2
The inner surface 35 above the bulge 33 of the side wall plate 3 forms a partition 36 as a blind space surrounding the band-like 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. A tapered outlet 43 is formed in the upper part of the upper flow passage 42 so as to decrease in thickness from one edge 37 to the other edge 37 (see FIG. 8). (The upper channel 42, the tapered outlet 43, and the upper part of the side wall plate 3 correspond to the outlet channel of the present invention, and the tapered outlet 43 corresponds to the throttle portion 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
(Rectifying plate of the present invention)
And the inner band-shaped metal plate 24 are manufactured in the same shape and size. The outer band-shaped metal plate 20 has four connecting portions 21 connected to the lower edge of the inner band-shaped metal plate 24 at the lower edge. A vertically extending second bulging portion 22 bulging inward is formed at an upper portion of each connecting portion 21.
A vertically extending third bulging portion 23 bulging inward and separated from the second bulging portion 22 is formed at an upper portion of the second bulge 2 at the same height as the second bulging portion 22 and reaches an 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.

Then, as shown in FIG. 6 and FIG.
The inner side surface of the swelling portion 22 contacts the outer side surface of the fourth swelling portion 25, and the inner side surface of the third swelling portion 23 contacts the outer side surface of the fifth swelling portion 26, so that the outer band-shaped metal plate 20. There are formed five vertical outer inner crater channels 29 that communicate with each other in the horizontal direction at the center between the inner zonal metal plate 24.

Further, since the inner strip-shaped metal plates 24 of the respective slit plates 2 are in contact with each other, the fourth bulging portions 25 and the fifth bulging portions 26 are in contact with each other and communicate with the lower edge and the central portion. Two vertical inner crater channels 200 are formed. The inner crater inner flow path 200 is composed of two vertical flow paths 201 by the opposed sixth bulging portion 27. Also,
The distance L1 between the opposed inner band-shaped metal plates 24 is 0.75 × L2 with respect to the distance L2 between the adjacent outer band-shaped metal plate 20 and the inner band-shaped metal plate 24. The flow path 200 is a flat narrow flow path compared to the outer crater inner flow path 29.

[Operation and Effect of the Embodiment] In the burner 1 for a flat gas appliance according to the present embodiment, the upper flow path 42 and the tapered outlet 43 of the main burner 11 supply the air-fuel mixture to the main crater 13 in the longitudinal direction of the burner 1. It is guided so that the flow rate becomes uniform (in the width direction). 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 dynamic pressure and the flow rate passing through the central part in the thickness direction of the flow path below the slit plate 2 are large (FIG. 6).
(Refer to the dynamic pressure distribution p in (e).) Since the air-fuel mixture passes through the narrow inner crater flow path 200, it is efficiently rectified in the vertical direction. 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.

Since the first recess 53 is provided in the side wall plate cover 5, the air-fuel 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. The vibration of the flame of the sleeve crater 15 is also suppressed. Then, the flame of the sleeve crater 15 produces a flame holding effect against 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.

FIG. 9 shows the result of comparing the magnitude of noise with respect to the frequency of the burner 1 for a flat gas appliance with that of a conventional burner for a flat gas appliance. The noise of the burner 1 for flat gas appliances is
As shown in FIG. 9 (a), the noise of the conventional burner for flat gas appliances (a) is particularly 600 Hz to 1.5 kHz.
It decreases (6 dB) in the range of z.

[Modification] The length of the outer band-shaped metal plate and the inner band-shaped metal plate in the vertical direction may be the same. 3 in main crater
More than one slit plate may be provided, or a single band-shaped metal plate may be combined as appropriate to make the partition interval of the main crater narrower toward the inside of the main crater. 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.

A plurality of sixth bulging portions 27 may be provided between the fourth bulging portions 25 or between the fifth bulging portions 26. The sixth bulging portion 27 may be formed at the same height as the fourth and fifth bulging portions 25 and 26, and the opposed sixth bulging portions may be brought into contact with each other. First
The shape, position, and number of the recesses 53 may be changed as appropriate to promote uniform supply of the air-fuel mixture to the sleeve crater 15.

[0028]

In the burner for a flat gas appliance according to the present invention, the air-fuel mixture having a large dynamic pressure and a relatively large flow rate at the central portion in the thickness direction of the throttle portion has a narrower gap between the straightening plates with a smaller gap than that between the straightening plates with a wider gap. Since the degree of rectification is large, the flow velocity distribution in the thickness direction of the main crater becomes uniform, so that the flame is stable and no noise is generated.

[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 flat gas appliance.

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

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;

FIG. 9 is a diagram showing noise characteristics.

[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) L1, L2 Distance (interval)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-9-42616 (JP, A) JP-A-6-313519 (JP, A) JP-A-8-135925 (JP, A) JP-A-6-313925 313517 (JP, A) JP-A-4-203703 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23D 14/02-14/10 F23C 11/00 304 F23C 11/00 329-330

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. And a flat gas appliance burner, which is provided in the outlet flow path downstream of the throttle unit and has four or more rectifying plates that partition the outlet flow path in the width direction, between the rectifying plates. The interval is narrower as the one inside the main crater Burner for a flat gas equipment that.