JPH08135929A - Flat burner for gas equipment - Google Patents

Abstract

PURPOSE: To obtain a flat burner for gas equipment, where vibration of flames at a burner port is mitigated and noise is reduced, by a method wherein exterior and interior baffle plates divide an outlet flow path on the downstream side of a throttle part and the lower edge of the interior baffle plate protrudes downward beyond the lower edge of the exterior baffle plate. CONSTITUTION: A main burner 11 has sidewall plates 3 that clamp a pair of slit plates 2 that is laid in contact with each other and forms a main burner port 13. A tapered outlet 43 is formed at the upper part of an upper flow path 42 and connected to the main burner port 13. The upper flow path 42, the tapered outlet 43 and the upper parts of the sidewall plates 3 serve as an outlet flow path and the tapered outlet 43 serves as a throttle part. The slit plates 2 each consist of an exterior baffle plate 20 that forms the outside of the main burner port 13 and an interior baffle plate 24 that forms the inside of the main burner port 13. The exterior baffle plate 20 has four connection parts 21 along the lower edge to connect to the lower edge of the interior baffle plate 24. The interior baffle plate 24 is taller than the exterior baffle plate 20, so that its upper edge is level with the upper edge of the exterior baffle plate 20 and its lower edge protrudes downward beyond the lower edge of the exterior baffle plate 20.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Sleeve fire burners for forming flat sleeve craters sandwiching the main crater are provided on both sides of the main crater of the flat main burner, and fuel gas is supplied from separate nozzles to the main burner and the sleeve fire burner. Burners for supplying flat gas equipment are known. This flat gas appliance burner is assembled so that a large number of burners are arranged in a row with a constant gap, and is used for a water heater or the like.

This burner for gas appliances 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 the main crater, and has a stoichiometric air-fuel ratio at the sleeve crater. When a fuel-air mixture that is richer in fuel than the fuel-air mixture (hereinafter referred to as a gas-rich mixture) is burned (so-called rich-lean combustion) to burn a uniform mixture as a whole, about 120 ppm of nitrogen oxides are emitted. (NOx) can be reduced to 40-60 ppm. On the contrary, 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 as in the above case.

[0004]

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

[0005]

According to the present invention, a sleeve fire burner for forming a flat sleeve crater sandwiching the main crater is provided on both sides of the main crater of the flat main burner. A burner for a flat gas appliance for supplying a fuel gas from a separate nozzle to the main burner, wherein the main burner has an inlet passage for sucking a mixture for combustion from one side of the main burner, and the main burner. An outlet flow path that allows the mixture to flow out to the main crater provided at the upper end, an intermediate flow path that connects the inlet flow path and the outlet flow path, and the main crater that is provided in the outlet flow path A narrowed portion formed of a gap formed by symmetrically bulging both side walls of the main burner inward so that the air-fuel mixture ejected from the air-fuel mixture is made uniform along the entire width of the main crater,
A flat gas appliance burner, comprising: four or more straightening vanes interposed in the outlet flow passage downstream of the throttle portion and dividing the outlet flow passage at substantially equal intervals in the width direction. The lower end of the above adopts a burner for flat gas equipment as a technical means, characterized in that the inner straightening plate projects below the outer straightening plate.

[0006]

In the burner for flat gas appliances of the present invention, the distance between the lower end and the upper end of the inner straightening vane is large.
Therefore, the rectifying effect between the inner rectifying plates is large. Therefore, of the jets that originally flow into the throttle, the air-fuel mixture with a large dynamic pressure and a large flow rate tends to flow into the central portion in the thickness direction of the throttle, and this tends to be the main source of disturbance. The flame is stable and no noise is generated.

[0007]

EXAMPLE A burner for a gas appliance of the present invention will be described based on an example shown in the drawings. In this embodiment, a plurality of burners for gas appliances are used as heating sources for water heaters.

[Structure of Embodiment] A plurality of flat gas equipment burners 1 are arranged in a row at a predetermined interval and fixed to a frame.
Each flat gas equipment burner 1 includes a main burner 11 that generates a main flame, and sleeve fire burners 12 that generate flames of sleeve fire on both sides of the main burner 11. The main burner 11 comprises an elongated main crater 13 and a flat first air-fuel mixture introducing portion 14 for introducing the 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 strip-shaped space, and a second air-fuel mixture introducing portion 16 for introducing the 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 side walls with the slit plate 2 sandwiched in the upper part to form a first air-fuel mixture introducing portion 14 and forms a main crater 1
3 and a side wall plate 3 for sucking the air-fuel mixture. The side wall plate 3 is covered with a side wall plate cover 5 that forms a sleeve burner 12 together with the side wall plate 3. The side wall plate 3 is formed by subjecting a metal plate to a bulging process, bending and stacking it in two layers, and the bent portion 31 generated by the bending serves as the lower end and serves as a pair of slit plates 2.
An elongated opening 32 (see FIG. 4) sandwiching the above is formed in a plane-symmetrical shape having an upper end.

A bulging strip 33 bulging inward in the horizontal direction is formed on an upper portion of the side wall plate 3 for sandwiching the pair of slit plates 2. Further, a first binding gap 34 for inserting an end portion of the slit plate 2 is provided at both ends in the width direction of the opening 32 in the upper portion of the side wall plate 3. The upper part of the inner side of the bulge 33, the outer side surface 202 of the slit plate 2 and the inner side surface 35 of the side wall plate 3 above the bulge line 33 form a partition 36 as a blind space surrounding the band-shaped space. Each of the vertical edge portions 37 of the side wall plate 3 has two flat plate-shaped side portions overlapped with each other.

One end edge portion 37 is provided with a notch 38 for attachment in the lower portion, and an upper portion is provided with an overhanging portion 39 above one of the side portions. The upper portions of the side portions are overlapped and the upper portions of the two side portions are crimped. Further, the other end edge portion 37 is provided with an overhanging portion 39 extending downward from the center of one side portion, and the overhanging portion 39 is bent and overlapped downward from the center of the other side portion to form two side portions. It is crimped. Further, spot welding is performed on the upper portion of one end edge portion 37 and the central portion and lower portion of the other end edge portion 37.

The side wall plate 3 has a first air-fuel mixture inlet 14 at the bottom.
And a suction part 300 for the sleeve fire burner 12 for sucking the air-fuel mixture into the sleeve crater 15 is formed to bulge outward. First
The air-fuel mixture introducing portion 14 has one end edge portion 37 on the notch 38 side.
Has a main burner suction port 4 and a lower flow passage 40 that extends horizontally from the main burner suction port 4 and curves 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 channel 41, which is in communication with the upper end of the lower flow channel 40 through a horizontal horizontal step 411 and has a smaller thickness than the lower flow channel 40, is provided above the lower flow channel 40.

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

The sleeve-fire burner 12 suction portion 300 has a tubular shape extending horizontally from the sleeve-fire burner 12 suction inlet 301 provided above the main-burner suction inlet 4 and the sleeve-fire burner 12 suction inlet 301. And a throat portion 310 forming a throat. On the outer surfaces on both sides of the end of the throat portion 310, slanted and slender flat surface portions 311 are provided,
On the flat surface portion 311, three small holes 312 for discharging the air-fuel mixture are arranged in rows.

The side wall plate cover 5 has a row of five rectangular punched portions 50 in a row over the entire width in the central portion of the metal plate, and a bulging process is performed on both sides of the row of the punched portions 50 to make a first bulge. The projecting portion 51 is formed, and both sides of the row of the punching portions 50 are bent to form a substantially U-shaped plane symmetry. The row of punched parts 50 overlaps the upper part of the side wall plate 3, the main crater 13, the partition part 36, and the cuff crater 15 are exposed from the punched part 50, and the first bulging part 51 covers both side surfaces of the side wall plate 3. On the upper part of the first bulge 51,
A second binding gap 56 circumscribing the first binding gap 34 is formed. Then, the flat plate portion 57 at the end portion of the side wall plate cover 5 which overlaps the end edge portion 37 of the side wall plate 3 is spot-welded to the side wall plate 3.

The first bulging portion 51 wraps the side wall plate 3 and forms slit-shaped sleeve craters 15 on both sides of the main crater 13. Further, the first bulging portion 51 includes the tapered outlet 43, the upper flow path 42,
Sleeve fire burner 12 Wrap the suction part 300 for sleeve fire burner 12
Second, by forming the sleeve crater passages 52 from the suction inlet 301 through the small holes 312 to the sleeve crater 15 on both sides of the main burner 11.
The air-fuel mixture introducing part 16 is formed. The first bulging portion 51 has a substantially notched circular shape having a downwardly convex contour in the central portion, and a first recess 53 that is in contact with a portion of the upper flow path 42 of the side wall plate 3 is provided. There are provided four second longitudinally long recesses 54 which are in contact with No. 3 and divide the cuff 15 into five in the width direction.

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

As a result, the slit plate 2 forms the outer side of the main crater 13 with the outer band metal plate 20 (rectifying plate of the present invention).
And an inner strip-shaped metal plate 24 forming the inside of the main crater 13
(Rectifying plate of the present invention). Outer strip 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 second bulge portion 22 that bulges inward is formed in the upper portion of each connection portion 21 and is elongated in the vertical direction. The third bulging portion 23, which bulges in the vertical direction and is long 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 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 strip metal plate 20, and the lower edge is located below the lower edge of the outer strip metal plate 20. The inner band-shaped metal plate 24 is formed with a fourth bulging portion 25 having a circular contour that bulges inward at the upper portion of each connecting portion 21. In addition, a fifth bulge portion 26, which is separated from the fourth bulge portion 25 and bulges inward, is formed at the same height as the fourth bulge portion 25 at the upper portion of each of the fourth bulge portions 25. Has reached the upper edge. In addition, at a position slightly below the center in the up-down direction between the connecting portions 21, the sixth swelling part 27 having a vertically elongated contour is provided as the fourth and fifth swelling parts 2.
It is formed with a height lower than 5, 26. Further, projecting plates 28 for inserting into the first binding gap 34 are provided at both ends in the width direction of the main crater 13 of the inner strip metal plate 24.

The inner side surface of the second bulging portion 22 contacts the outer side surface of the fourth bulging portion 25, and the inner side surface of the third bulging portion 23 contacts the outer side surface of the fifth bulging portion 26. As a result, between the outer band-shaped metal plate 20 and the inner band-shaped metal plate 24, there are formed five vertical outer crater channels 29 that communicate with each other horizontally in the center. 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 are in contact with each other and communicate with each other at the lower edge and the central portion. The inner crater passage 200 is formed. The inner crater flow passage 200 is composed of two vertical flow passages 201 due to the facing sixth bulge 27.

[Operation and Effect of the Embodiment] The flat gas appliance burner 1 of the present embodiment has an upper flow path 42 of the main burner 11.
And the tapered outlet 43 guide the 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 uniformized so that the deviation is further reduced.
Further, since the main crater 13 is divided into five and the sixth bulge 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 metal plate 24 is located at a position extending downward to the vicinity of the lower end of the tapered outlet 43. In the space between the lower edges of the inner strip-shaped metal plates 24, the air-fuel mixture having a large dynamic pressure and a large flow rate flows in at the central portion in the thickness direction of the air-fuel mixture flow (dynamic pressure distribution p in FIG. 6E). (See) It was the main source of disturbance. In the present embodiment, the space between the lower edges of the inner strip metal plate 24 has a large distance from the upper end of the inner strip metal plate 24. This enhances the effect of vertically rectifying the air-fuel mixture between the inner strip-shaped metal plates 24. 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 vibration due to the occurrence and disappearance of lift and the lateral shake. Therefore, the noise generation at the main crater 13 is extremely small.

Further, since the side wall cover 5 is provided with the first recess 53, 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 sleeves. The vibration of the flame of the crater 15 is also suppressed. And sleeve crater 1
The flame of No. 5 has a flame holding effect on the flame of the main crater 13 by the partition 36. Due to this flame holding effect, the flame of the main crater 13 is further stabilized, and noise generation 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 any plural number. Sixth
The bulging portions 27 are located between the fourth bulging portions 25 or the fifth bulging portion 26.
A plurality may be provided between the two. The sixth bulge 27 is the fourth and the fifth.
It may be formed at the same height as the bulging portions 25 and 26 and the sixth bulging portions facing each other may be brought into 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 drawings]

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

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 burner for gas equipment.

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

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

7 is a sectional view taken along line BB and CC in FIG.

8 is a cross-sectional view taken along the line DD of FIG.

[Explanation of symbols]

 1 Flat Gas Equipment Burner 4 Main Burner Suction Port (Inlet Flow Path) 11 Main Burner 12 Sleeve Fire Burner 13 Main Crater 15 Sleeve Crater 20 Outer Strip Metal Plate (Rectifier Plate) 24 Inner Strip Metal Plate (Rectifier Plate) 33 Expansion Stroke (throttle portion) 40 Lower flow passage (inlet flow passage) 41 Intermediate flow passage 42 Upper flow passage (outlet flow passage) 43 Tapered outlet (throttle portion)

Claims (1)

[Claims] 1. A sleeve fire burner for forming a flat sleeve crater sandwiching the main crater is provided on both sides of the main crater of the flat main burner,
A flat gas equipment burner for supplying fuel gas from separate nozzles to a main burner and a sleeve fire burner, wherein the main burner is an inlet flow for sucking a mixture for combustion from one side of the main burner. A passage, an outlet passage for letting out the air-fuel mixture into the main crater provided at the upper end of the main burner, an intermediate passage connecting the inlet passage and the outlet passage, and the outlet passage And a throttle formed of a gap 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 burner for flat gas equipment, comprising: a portion, and four or more straightening vanes interposed in the outlet flow passage downstream of the throttle portion and dividing the outlet flow passage in the width direction at substantially equal intervals, At the bottom of each baffle, the inner baffle is the outer baffle Ri burner flat gas appliances, characterized in that projects downward.