JPH0742917A - Burner for gas equipment and its manufacturing method - Google Patents

Abstract

PURPOSE:To enable a structure of mixture gas supplying mechanism to be simplified, facilitate adjustment of an air-fuel-ratio at each of burners and further reduce a manufacturing cost in an arrangement in which mixture gases having different air excessive rates are separately supplied to a first burner and second burners at both sides of the first burner. CONSTITUTION:A burner 100 for a gas equipment in which both sides of a first flame port 11 of a first burner 1 are formed with a second flame port 21. holding the first flame port 11 is constructed such that the second burners 2 are provided with a common suction port 22 for sucking fuel gas and primary air and supplying them to second flame ports 21 arranged at both sides of the first flame port 11 in an independent from the first burner 1.

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 and a method for manufacturing the burner.

[0002]

2. Description of the Related Art On both sides of the first crater of a flat first burner,
A second burner that forms a second crater sandwiching the first crater is provided, and a burner for gas equipment that supplies fuel gas from separate nozzles to the first burner and the second burner (JP-A-3-2635).
No. 05) is known. This burner for gas appliances
It is assembled so that a large number of them are arranged in a row with a certain gap, and is used for a water heater or the like.

In the burner for a gas appliance of this structure, a fuel-air mixture (hereinafter referred to as an air-rich mixture) having a fuel leaner than the stoichiometric air-fuel ratio is burned at the first crater, and a fuel richer than the stoichiometric air-fuel ratio at the second crater. By burning a fuel-air mixture (hereinafter referred to as a gas-rich mixture), when the entire mixture is burned with a uniform mixture, the nitrogen oxides (NOx) discharged by about 120 ppm can be reduced to 40 to 60 ppm. On the contrary, by burning the gas-rich air-fuel mixture at the first crater and burning the air-rich air-fuel mixture at the second crater, low NOx combustion can be performed as in the above case.

[0004]

However, in this type of burner for gas equipment, conventionally, in order to supply the air-fuel mixture to the three craters arranged in parallel, it is necessary to provide the fuel gas supply pipe with three ejection nozzles. Corresponding to this, three inlets for the burner mixture are installed in parallel. Therefore, it takes time and effort to adjust the air-fuel ratio of each burner against variations in manufacturing and assembly, and the structure becomes complicated,
There is a drawback that the manufacturing cost increases.

The object of the invention described in claim 1 or 2 is to:
In the structure in which the air-fuel mixture having different excess air ratios is independently supplied to the first burner and the second burners on both sides of the first burner, the structure of the air-fuel mixture supply mechanism can be simplified, and the air-fuel ratio of each burner can be easily adjusted and manufactured. It is to provide a burner for gas equipment, which can reduce the cost. The object of the invention described in claim 3 or 4 is
The two second craters (sleeve craters) sandwiching the first crater (sleeve crater) can be formed by covering the first burner with press molding of a single metal plate, and the burner for gas equipment can be easily manufactured and reduced in cost. To provide a manufacturing method of. It is an object of the invention according to claim 5 or 6 to provide a method for manufacturing a burner for a gas appliance in which the air-fuel mixture is evenly distributed to the two second craters (sleeve craters) of the second burner. The object of the invention described in claims 7 to 11 is to reduce combustion noise by dividing the flame from the first crater. The object of the invention as set forth in claim 12 is to eliminate the welding for forming the first crater and prevent the deterioration of the dimensional accuracy due to thermal strain. The object of the invention described in claim 13 is to provide a partition zone between the first crater and the second crater to further reduce combustion noise.

[0006]

DISCLOSURE OF THE INVENTION A burner for a gas appliance of the present invention is provided with a second burner forming a second crater sandwiching the first crater on both sides of the first crater of the first burner. In the burner for a vehicle, the second burner is independent of the first burner and sucks the fuel gas and the primary air to suck the first burner.
A common suction port was provided to supply to second craters provided on both sides of the crater. The burner for gas combustion according to claim 2 is a flat sheet metal first burner having a main crater at the upper end, and a sheet metal second burner forming slit-shaped sleeve craters sandwiching the main crater on both sides of the main crater. In the burner for gas equipment provided with a burner, the said 2nd burner is independent of the said 1st burner, and is a common thing which inhales fuel gas and primary air, and supplies them to both sleeve craters provided on both sides of the said main crater. Equipped with an inlet.

According to a third aspect of the present invention, there is provided a method for manufacturing a burner for a gas appliance, wherein the first burner is formed by symmetrically punching and bulging a metal flat plate, bending the symmetric plane, and bulging the first burner at the bulging portion. The second burner is formed by joining a non-bulging portion together with forming a flow path, and the second burner is a cover formed by punching a sheet metal into a predetermined shape and bulging symmetrically and bending the symmetric surface. At least the upper part of the burner was wrapped, and the common suction port, the second burner flow passage extending from the common suction port to the sleeve craters, and the sleeve craters sandwiching the main crater were formed.

In the method for manufacturing a burner for a gas appliance according to a fourth aspect, one end of the first burner passage is an intake port, and a first burner inlet portion that extends horizontally from the one end to the other end. And a first burner intermediate portion that rises upward from the other end of the first burner inlet portion, and a first burner outlet portion that extends over the entire width from the upper end of the first burner intermediate portion and is continuous with the first crater, One end serves as a second burner suction port and the other end serves as a communication port to the flow path of the second burner in the non-bulging portion between the first burner inlet portion and the first burner outlet portion. To form a horizontal tubular portion. In the method for manufacturing a burner for a gas appliance according to claim 5, the communication port includes a group of small holes in the axial direction that are arranged in a row at the other end of the tubular portion.
In the method for manufacturing a burner for a gas appliance according to claim 6, the small hole groups are arranged in two rows symmetrically on the left and right upper surfaces of the other end of the tubular portion.

In the structure according to the seventh aspect, the first crater is formed by a slit row in which a large number of slits are arranged in parallel. In the eighth aspect, the first crater is formed by arranging a large number of small craters in a plane. In a ninth aspect, the large number of small craters are formed by forming small holes in a matrix in a metal plate. In the tenth aspect, the large number of small craters are formed by alternately stacking a metal corrugated plate and a metal flat plate. In the eleventh aspect, the plurality of small craters are formed by overlapping belt-shaped metal plates having projections in the plane direction to form a ribbon, and forming two ribbons so as to face each other. Claim 1
In 2, the both ends of the two ribbons are connected to the first
The ribbons are sandwiched between binding spaces provided at both corners of the first crater, and the upper ends of the ribbons are held in contact with bridges provided at the second crater of the second burner. In claim 13, the first
A division zone is provided between the crater and the second crater.

[0010]

In the invention described in claim 1 or 2, the second burner has a common suction port, and from one nozzle to two second craters (sleeve craters) on both sides of the first burner. Fuel gas is supplied. Therefore, the number of nozzles and suction ports for adjusting the air-fuel ratio to the set value can be reduced, the structure is simple, and the adjustment of the air-fuel ratio is easy. In the invention according to claim 3 or 4, since the two cuffs are formed by covering the first burner with one molding plate, the manufacturing is easy and the cost can be reduced. In the invention according to claim 5 or 6, the air-fuel mixture can be uniformly supplied along the entire width of the second burner and can be appropriately dispersed and supplied to the two sleeve craters, so that the combustion stability can be improved.

The first crater is formed by a row of slits in which a large number of slits are arranged side by side, as described in claim 7.
The amount of combustion per one flame port (slit) can be reduced.
As a result, in the flat burner, it is possible to reduce the vibration of the flame that tends to occur when the flat burner is used in the lean air-fuel ratio range due to the uneven combustion. That is, since the vibration energy at one flame opening is small, the vibration of the flame is small and the generation of noise due to the vibration can be reduced. The vibration of the flame is generated by claim 8.
As described in any one of 9, 10, and 11, it is possible to further reduce the noise level by forming the first crater by arranging a large number of small craters in a plane shape, and it is possible to further reduce the noise level. By forming the first crater by sandwiching and holding the ribbon as described in claim 12, welding becomes unnecessary and unevenness in dimensional accuracy due to thermal strain can be reduced.

As described in claim 13, the first crater and the second crater
A partition zone is provided between the crater and a part of the air-fuel mixture ejected from the first crater becomes a vortex and is generated so as to reach the inside of the partition zone. Due to this vortex flow, the air-fuel mixture from the second crater is suppressed downward and becomes a flame toward the first crater. As a result, the vibration of the flame of the first crater is prevented from affecting the flame of the second crater, the flame of the second crater is stabilized, and the flame holding effect for the flame of the first crater is ensured. Thereby, the flame of the first crater can be stabilized and combustion noise can be reduced.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a heating source 200 for a water heater, in which a burner 100 for a gas appliance according to the present invention is fixed by a frame (not shown) and arranged in rows at a predetermined interval. Each of the gas appliance burners 100 has a flat main burner (first burner) 1 having an elongated main crater (first crater) 11 at the upper end and a mixture inlet 12 on the side, and the main crater 11 It is composed of a sleeve fire burner (second burner) 2 which has flat slit-shaped sleeve craters (second craters) 21, 21 adjacent to both sides and has one common suction port 22 on the side. At the suction port 12 of the main burner 1 and the common suction port 22 of the sleeve fire burner 2, throttle holes 31 and throttle holes 3 for adjusting the primary air to each burner are provided.
A damper 3 in which 2 are arranged in a row is installed.

As shown in FIGS. 2 (a) and 2 (b), the main burner 1 punches a large number of parallel slits of sheet metal to be the main crater 11 at the center position, and the center line is formed on both sides with the center line as a plane of symmetry. The bulged portions 1A and 1B are formed symmetrically. Next, as shown in (a) of FIG. 2 and (a) and (b) of FIG. 3, a substantially U-shape is used with reference to the parallel lines on both sides of the center line excluding the main crater 11 part (upper edge in the drawing). It is bent into a shape, and the flat plate portion 1C is overlapped and spot-welded. Flat plate part 1
It is desirable that the edges of C are stacked and bent in a U shape to prevent gas leakage.

As a result, as shown in FIGS. 1 and 2 (a) and FIGS. 3 (a) and 3 (b), the main crater 11 composed of a slit array in which a large number of slits 111 are arranged side by side is formed. Due to the bulging portion 1A of the sheet metal, an intake port 12 for the air-fuel mixture is provided at one end, and a flow path 13 that connects the intake port 12 to the main crater 11 is formed inside. Further, the swelling portion 1B of the sheet metal causes the sleeve fire burner 2 to be provided above the suction port 12.
A suction port portion 14, a throat portion 15, and a throat outlet portion 16 are formed. In this embodiment, the main burner 1 is manufactured by press-forming one sheet metal, but it may be manufactured by another processing method such as welding or casting.

The sleeve fire burner 2 is formed as follows.
A plurality of rectangular punched portions 20a are continuously provided at the center position of the sheet metal, and bulging portions 2A are symmetrically formed on both sides of the punched portion 20a with the center line as a plane of symmetry. Next, as shown in (b) of FIG. 2 and (a) and (b) of FIG. 3, the parallel lines on both sides of the center line are bent in a substantially U-shape as broken lines (upper edges in the drawing) to cover the cover 20. Mold.

Next, as shown in FIGS. 1 and 2B and FIGS. 3A and 3B, the cover 20 is put on the main burner 1, and the flat plate portion 2B of the cover 20 is covered by the main burner 1. Spot welding is performed on the flat plate portion 1C. As with the main burner 1, it is desirable that the edges of the flat plate portion 2B be overlapped and bent into a U shape to prevent gas leakage. Bulge 2A
Encloses the main crater 11, the suction port 12, and the flow path 13 of the main burner 1, and the slit-shaped sleeve crater 2
1, 21 and the common suction port 22 are formed, and a flow path 23 is formed on both sides of the main burner 1 from the common suction port 22 to the sleeve craters 21, 21. The main crater 11 and the sleeve craters 21, 21 are exposed in the rectangular punched portion 20a.

Further, in this embodiment, the suction inlet portion 14, the throat portion 15 and the throat outlet 16 for the sleeve fire burner 2 provided in the main burner 1 are structured to fit into the common inlet 22. . With this structure, the sleeve fire burner 2
The primary air and fuel gas required in the above are sucked in through the common suction port 22 of the sleeve fire burner 2, mixed by the throat portion 15 provided in the main burner 1, and the throat portion 15
It is divided into two parts on the left and right by the throat outlet 16 and is supplied to the two sleeve craters 21 and 21. As a result, two sleeve craters 2
There is an advantage that the amounts of air-fuel mixture supplied to Nos. 1 and 21 can be made uniform.

As shown in FIGS. 1 and 4, the inlet 12 of the main burner 1 and the inlet 22 of the sleeve fire burner 2 of the group 100 of gas appliance burners and the throttle holes of the damper 3 installed at these inlets. Fuel gas supply pipes 4 and 5 are provided in parallel so as to correspond to 31 and the throttle hole 32. Each of the supply pipes 4 and 5 has the throttle hole 31 and the throttle hole 32.
Nozzles 41 and 51 are arranged in a row corresponding to the center position of.

The fuel gas ejected from the nozzle 41 entrains primary air through the throttle hole 31 and flows from the suction port 12 to the flow path 13, and is burned at the main crater 11 as shown in FIG.
The fuel gas injected from the nozzle 51 entrains the primary air through the throttle hole 32 and the intake port 22 through the throat portion 15.
To the flow path 23, dispersed on both sides of the main crater 11 and burned at the sleeve craters 21, 21.

As combustion conditions, the excess air ratio of the main burner 1 is set to be, for example, an air-rich mixture of 1.4, and the excess air ratio of the sleeve fire burner 2 is set to a gas-rich mixture of 0.8. It As a result, the combustion in the main burner 1 is sufficiently air-excessive, so nitrogen oxides (NO
X) is small, and the sleeve fire burner 2 has a sufficient excess of fuel, so NOX is small. Also the main crater 11
Is formed by a slit row in which a large number of slits 111 are arranged in parallel, the combustion amount per one flame port (slit) can be reduced. As a result, in the flat main burner 1,
It is possible to reduce the vibration of the flame that tends to occur during use in the lean air-fuel ratio range due to uneven combustion. That is, since the vibration energy at one flame opening (slit 111) is small,
The vibration of the flame is small and the generation of noise due to the vibration can be reduced.

As a result, 120 ppm generated when the whole is burned at a constant excess air ratio (for example, 1.2)
The amount of NOx emission is about 1
In 00, it can be reduced to 40-60 ppm. Such NOx
It is important to adjust the air-fuel ratio of the air-fuel mixture supplied to the main burner 1 and sleeve fire burner 2 in order to reduce the emission amount of. This air-fuel ratio adjustment is performed by adjusting the diameters and positions of the nozzles 41 and 51 and the diameters and positions of the throttle holes 31 and 32 of the damper 3.

In the adjustment of the air-fuel ratio, if the structure in which the air-fuel mixture is supplied to the two slit-shaped sleeve fire mouths 21, 21 from the single common inlet 22 as in the present invention, the sleeve fire burner 2 must be adjusted. The number of nozzles 51 and throttle holes 32 that cannot be reduced can be reduced by half. As a result, manufacturing and assembling operations are simplified. Further, in the manufacture of the gas appliance burner 100 of the present invention, the sleeve fire burner 2 having the two slit-shaped sleeve fire mouths 21, 21 and the single common suction mouth 22 is a main burner formed by press-molding one sheet metal. Cover 1
It can be manufactured at low cost by welding.

In the above-mentioned embodiment, the reason why the intake port 12 of the main burner 1 is set below the intake port 22 of the sleeve burner 2 is that the air-rich mixture is long because it completely mixes the fuel gas and air. By requiring a flow path. Also,
In the present invention, the gas rich mixture may be supplied to the main burner 1 and the air rich mixture may be supplied to the sleeve fire burner 2. In this case, as in the second embodiment shown in FIG. It is desirable to set the suction port 12 above the suction port 22 of the sleeve fire burner 2. Swelling portion 1D in FIG.
Shows the same function as the bulging portion 1B in FIG.

According to the present invention, as in the third embodiment shown in FIG. 6, the main burner 1 is provided with the suction port portion 1 for the sleeve fire burner 2.
4, the notch 17 having a shape corresponding to the throat portion 15 and the throat outlet 16 may be formed in advance. This configuration can also be applied to the bulging portion 1D shown in FIG. When the burner 100 for a gas appliance of the present invention is applied to a gas combustion appliance that greatly increases or decreases the heat generation amount, if the combustion amount is reduced, a flashback is likely to occur in the burner on the gas rich side. Therefore, the slit-shaped sleeve burner 21 of the sleeve burner (second burner) 2 is
It is desirable to divide 1 into a large number of flame outlets, reduce the area of the sleeve fire outlet 21 and configure it with a row of small flame outlets having an extinguishing action. The sleeve fire mouth 21 having such a shape is used in the sleeve fire burner 2
The cover 20 can be easily formed by punching.

7 to 10 show a fourth embodiment. In this embodiment, the vertical width of the cover 20 shown in FIGS. 10A, 10B, and 10C is made shorter than the main burner 1 shown in FIGS. 9A, 9B, and 9C. Burner 10 for gas appliances
The lower wall of No. 0 has a single structure to reduce weight and cost. The main burner 1, as shown in FIG.
Has an inlet 12 at one end thereof, an inlet portion 13A extending horizontally from the one end to the other end, an intermediate portion 13B rising upward from the other end of the inlet portion 13A, and an entire width from the upper end of the intermediate portion 13B. The outlet part 1 which spreads over and extends to the main crater 11
3C and.

The intermediate portion 13B of the flow path 13 is an intermediate step 13
1, the width of the upper part is reduced by the plate thickness of the cover 20, and when the cover 20 is covered and welded,
As shown in, the surface 20A of the cover 20 and the surface 10A of the main burner 1 are set to be flush with each other. As a result, the burner 100 for a gas appliance can be made flat on both sides and can be made thin, which makes it compact when the heating source 200 shown in FIG. 1 is assembled, and can prevent a problem that the lower end of the cover 20 is caught during the assembling work. Is.

The outlet portion 13C of the flow path 13 is formed thinner than the intermediate portion 13B through the inclined step 132, and the sleeve wall is provided between the outer wall of the outlet portion 13C and the inner wall of the cover 20. It serves as a flow path 23 for the air-fuel mixture of the burner 2. The throat portion 1 which is a tubular portion formed in the non-bulging portion 18 between the inlet portion 13A and the outlet portion 13C of the main burner 1.
5 is formed so as to be slightly retracted from the suction port 12 of the main burner 1, and the throat outlet 16 which is a communication port is composed of a group of axially arranged small holes 161. This small hole 16
The first group is arranged in two rows at both ends of the inclined surfaces 19 formed symmetrically on the left and right upper surfaces of the cylindrical throat portion 15 on the throat outlet 16 side.

Due to the inclination of the step portion 132 and the appropriate dispersion of the small holes 161 in the axial direction, the air-fuel mixture blown out from the throat outlet 16 increases the pressure in the flow passage 23 of the sleeve fire burner 2. No diffused, slit sleeve crater 21,
It is possible to evenly distribute over the entire width of 21. Therefore, in the slit-shaped sleeve crater 21, the pressure in the flow passage 23 does not rise unlike the case where the portion of the flow passage 23 corresponding to the strong distribution portion is narrowed to achieve a uniform distribution. The inconvenience that the air-fuel mixture leaks from the flow path 23 does not occur. Therefore, the vertical width of the cover 20 can be set to cover only the upper portion of the main burner 1.

The suction port portion 14 for the sleeve fire burner 2 is retracted from the common suction port 22 of the cover 20 by about 3 mm, and as shown in FIG. 8, the tip of the throttle hole 32 of the damper 3 projects cylindrically. It is inserted in contact with the common suction port 22. This has an advantage that the air-fuel mixture of the sleeve fire burner 2 can be prevented from leaking from the gap between the main burner 1 and the cover 2 and dissipating into the atmosphere.

Since the main burner 1 has a high degree of flatness as a burner, the premixture of fuel gas and air is completely distributed to the middle and both sides of the main crater 11 along the entire range from high load combustion to low load combustion. It is difficult to supply evenly. Usually, either side of the main crater 11 is likely to be insufficient or excessive in premixed air. As a result, vibration occurs due to repeated occurrence and extinction of the flame lift on the side portion of the main crater 11 where the premixed air is insufficient or excessive, and the vibration causes noise. As shown in FIGS. 1 and 7, as a measure against the vibration of the flame, if the main crater 11 is composed of the rows of the slits 111, the flame in which the vibration is generated can be limited and the combustion energy of one flame can be reduced. It has some vibration suppression and noise prevention effects. However, in the case where the pre-mixture of the main burner 1 is relatively air-rich with an excess air ratio of about 1.4, and in the gas equipment having a large variable range from the maximum calorific value to the minimum calorific value of the burner 100,
In some cases, the vibration of the flame and the generation of noise cannot be sufficiently prevented only by forming the main crater 11 with the slit row.

FIG. 11 shows a fifth embodiment of the burner for gas equipment of the present invention. In this embodiment, the main crater (first crater) 11 of the main burner (first burner) 1 is formed by arranging a large number of small craters 6 in a plane. Thus, the main crater 11
With the small crater 6 which is smaller than the slit 111, the vibration of the flame can be prevented more effectively. As a method of forming a large number of small craters 6, the main crater 11
Round holes 61 are formed in a matrix shape in the metal plate at the formation position of. The round holes 61 are round holes having a diameter of 0.9 mm, and are formed in four rows in the width direction at a pitch of 1.6 mm. The round holes 61 may be oval or may be provided in other patterns such as a grid pattern. By arranging a large number of small craters 6 in a plane to form the main crater 11 as in this embodiment, the vibration energy of the vibrating flame can be dispersed. As a result, the vibration of the specific flame does not easily propagate to other flames, and noise can be reduced.

In the fifth embodiment, in contrast to the fourth embodiment shown in FIG. 8, of the group of small holes 161 forming the throat outlet 16, two small holes on the side of the common suction port 22 are omitted. This is because the distance from the common suction port 22 is too short and the mixture gas in which the fuel gas and the primary air are not sufficiently mixed is prevented from being blown out to the flow path 23. In this embodiment, in the sleeve fire burner 2 having an extremely high degree of flatness, the sleeve crater 2
In order to evenly distribute the air-fuel mixture over the entire widths of 1 and 21, the blind portion 8 is formed in the air-fuel mixture flow path 23. The blind portion 8 is formed by providing a recess 81 having a substantially notched circle shape and contacting the outer surface of the bulging portion 1A of the main burner 1 at a predetermined position near the center of the bulging portion 2A of the cover 20. . The blind portion 8 allows the air-fuel mixture supplied to the sleeve craters 21, 21 to be uniformly supplied along the entire width, and prevents either side from becoming insufficient or excessive in the air-fuel mixture. As a result, it is possible to prevent instability of combustion in which flame vibration occurs on the side portions of the sleeve craters 21 and 21 where the air-fuel mixture is insufficient or excessive, or a flashback occurs.

FIG. 12 shows a sixth embodiment of the burner for gas equipment. In this embodiment, as a method of forming a large number of small craters 7, four metal corrugated plates 71 and three metal flat plates 72 are alternately stacked to form seven rows of small craters 7 having a trapezoidal cross section in the width direction. is doing. FIG. 13 shows an example of a member forming the small crater 7. Reference numeral 73 is a central flat plate, 74 is an inner corrugated plate connecting body sandwiching the central flat plate, 75 is an outer flat plate connecting body which is superposed on the outer surface of the inner corrugated plate connecting body 74, and 76 is an outer surface of the outer flat plate connecting body 75. It is an outer corrugated plate connection body. These are laminated and spot-welded, fitted into the upper end of the main burner 1 and welded to form the main crater 11 shown in FIG.

In this structure, the small crater 7 is longer in the vertical direction than the small crater 6 of the fifth embodiment, so that the ventilation resistance can be appropriately imparted and the rectifying effect is large. Especially in FIG.
In the configuration shown in (1), since the inner corrugated plate connecting body 74 and the outer corrugated plate connecting body 76 are provided with the corrugated plate portions 77 on the upper and lower sides, and the middle is the flat plate portion 78, the small crater 7 is It itself has a rectifying effect. The small crater 7 of the sixth embodiment has an advantage that it has a great effect of preventing flame vibration, but has a drawback that the structure is complicated and the manufacturing cost is high. In this sixth embodiment as well, as shown in FIG. 14, in order to evenly distribute the air-fuel mixture over the entire width of the sleeve craters 21, 21 as in the fifth embodiment, a blind portion is formed in the air-fuel mixture flow passage 23. 8 forming.

15 to 17 show a seventh embodiment. In this embodiment, as shown in (a), (b), and (c) of FIG. 16, a zone 24 is provided between the main crater 11 and the sleeve crater 21 as a strip-shaped space in the burner 100. Ward 2
4 is generated so that a part of the air-fuel mixture ejected from the main crater 11 becomes a vortex V and reaches the inside of the division zone 24. Due to this vortex V, the air-fuel mixture from the sleeve crater 21 is suppressed downward and becomes a flame F2 toward the main crater 11. As a result, the vibration of the flame F1 of the main crater 11 is caused by the flame F2 of the sleeve crater 21.
The flame F2 of the sleeve crater 21 is stabilized and the flame holding effect on the flame F1 of the main crater 11 is ensured. This stabilizes the flame F1 of the main crater 11 and reduces combustion noise.

The width of the dividing strip 24 is 1.3 in this embodiment.
mm is set, and 1.0 mm or more is necessary for stabilizing the flame F2 of the sleeve crater 21 and reducing noise,
A thickness of 2.0 mm or less is desirable from the viewpoint of stabilizing the main flame due to the sleeve flame. Ward zone 24 and main crater 11
As shown in (a) and (b) of FIG. 16, a horizontal inward bulging strip 25 is formed in a strip shape at the upper ends of both side surfaces of the main burner 1, and the space between the bulging strips 25, 25 is increased. And ribbon 9,
It is formed by fitting two 9 pieces. By using the same ribbons 9 and 9 in piles, there is an advantage that the number of parts can be reduced. Each ribbon 9 is shown in FIG.
As shown in (b) and (c), the projections 91 in the surface direction are formed.
The belt-shaped metal plates 92 and 93 having the target shape are double-layered, and the two metal plates 92 and 93 are used facing each other as shown in FIG.

In this embodiment, the ribbon 9 is formed by punching a metal plate into a predetermined shape and bulging the projection 91, and then bending the doubly, and has five connecting portions 90 at the lower edge. An outer band-shaped metal plate 92 in which inward bulging portions 91 are formed at positions corresponding to the portions 90,
A bulging portion 91 inward at a position corresponding to the connecting portion 90.
And an inner strip-shaped metal plate 93 provided with projecting plates 94 on both sides. The ribbons 9 are fitted into the upper end portion of the main burner 1 with the inner side surfaces of the inner strip-shaped metal plate 93 facing each other and the pair facing each other. The ward belt 24 is
The inner wall of the bulging strip 25 and the outer surface of the outer band-shaped metal plate 92 of the ribbon 9 are in contact with each other to form a blind gap. In the main crater 11, each projection 91 serves as a spacer, and is composed of a gap between the two strip-shaped metal plates 92 and 93 of the ribbons 9 and 9 and a gap between the inner strip-shaped metal plates 93 and 93 of the two sets of ribbons 9 and 9.

As shown in FIG. 15, at the both ends of the upper end of the main burner 1, there are provided binding gaps 95, 95 into which the two projecting plates 94, 94 are superposed and inserted. Also cover 2
Bonding gaps 95 at both ends of 0, and binding gaps 9 circumscribing 95.
6, 96 are formed. Further, on both side surfaces of the cover 20, inwardly bulged portions 26 are formed appropriately for uniforming the flow rate distribution of the air-fuel mixture to the sleeve craters 21 of the sleeve fire burner 2. The two ribbons 9 and 9 are sandwiched between the protruding plates 94 and 94 at both ends of each ribbon 9 in the binding gaps 95 and 95 provided at both corners of the main crater 11 of the main burner, and The upper end is attached to the main crater 11 by abutting on a bridge 20B provided on the upper end of the cover 20.

As described above, in the burner for gas appliances of this embodiment, the projecting plates 94, 94 are sandwiched between the binding gaps 95, 95 by welding both ends P, P at the upper end of the main burner 1, and Two outer strips 92 and two inner strips 93 are sandwiched between the bulging strips 25, 25 (see FIG. 16) on both sides of the main burner 1, and between the both side walls of the cover 20, the main burner 1 is covered. The two ribbons 9 and 9 are formed so as to sandwich both side surfaces, and the two ribbons 9 and 9 are connected to the connecting portion 20b of the cover 20 and the binding gaps 95 and 95.
It is clamped and fixed in the vertical direction by the bottom of the. As a result, spot welding at the intermediate portion of the main burner 1 and the cover 20 can be omitted. As a result, the main burner 1 and the cover 20 are free from thermal distortion due to spot welding, the wall intervals can be made uniform along the entire width, and the assembling is easy and the dimensional accuracy is improved.

FIG. 18 shows measurement data of noise of the burner for gas equipment according to the present invention. When A is not performing combustion and only the combustion fan is operated, B is a gas equipment burner according to the seventh embodiment, C is a gas equipment burner according to the fifth embodiment, and D is a gas according to the first embodiment. For the burners for equipment, all are the measurement results of the noise level of the A characteristic.
The final level is 35 dB for A, 38 dB for B,
C is 44 decibels and D is 54 decibels, and it can be seen that the burner of the seventh embodiment has significantly reduced noise in the combustion state.

FIG. 19A shows the stable combustion range of the conventional burner for gas equipment in the low combustion area of nitrogen oxides, and FIG. 19B shows the low-nitrogen oxide combustion area of the burner 100 for gas equipment of the present invention. 3 is a graph showing a stable combustion range in FIG. All the data show the stable combustion range in the clean combustion range where the generation of nitrogen oxide (NOx) is 60 ppm or less. As can be seen from this graph, the burner 100 for gas appliances of the present invention shown in (b) is capable of stable combustion with low NOx in a remarkably wider combustion range than the conventional burner 100 for gas appliances shown in (a). is there.

[Brief description of drawings]

FIG. 1 is a perspective view of a combustion part of a gas water heater using the burner for gas equipment of the present invention.

FIG. 2 is a side view of a main burner and a gas appliance burner.

FIG. 3 is a cross-sectional view of a main burner and a gas appliance burner.

FIG. 4 is a schematic view of a gas water heater using the burner for gas equipment of the present invention.

FIG. 5 is a side view of a main burner and a gas appliance burner according to a second embodiment.

FIG. 6 is a side view of a main burner and a gas appliance burner according to a third embodiment.

FIG. 7 is a perspective view of a burner for gas equipment according to a fourth embodiment.

FIG. 8 is a side view of a burner for a gas appliance according to a fourth embodiment.

FIG. 9 is a side view, a front view, and a rear view of a main burner according to a fourth embodiment.

FIG. 10 is a side view, a front view, and a rear view of a cover according to a fourth embodiment.

FIG. 11 is a plan view and a front view of a burner for a gas appliance according to a fifth embodiment.

FIG. 12 is a plan view of a burner for gas equipment according to a sixth embodiment.

FIG. 13 is a component diagram of a main crater of a burner for a gas appliance according to a sixth embodiment.

FIG. 14 is a side view of a burner for gas equipment according to a sixth embodiment.

FIG. 15 is a plan view and a front view of a burner for gas equipment according to a seventh embodiment.

FIG. 16 is a component diagram of a main crater of a burner for gas equipment according to a seventh embodiment.

FIG. 17 is a sectional view of a main portion of a main burner according to a seventh embodiment.

FIG. 18 is a graph showing the noise level of the burner for gas equipment of the present invention.

FIG. 19 is a graph showing a stable combustion region of the burner for gas equipment of the present invention.

[Explanation of symbols]

 1 Main burner (1st burner) 2 Sleeve fire burner (2nd burner) 3 Damper 4 Fuel gas supply pipe of main burner 5 Fuel gas supply pipe of sleeve fire burner 6, 7 Small crater 11 Main crater (1st crater) 20 Cover 21 Sleeve crater (2nd crater) 22 Common inlet 100 Gas equipment burner 111 Slit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Yagi 2-26 Fukuzumicho, Nakagawa-ku, Nagoya-shi Rinnai Corporation

Claims (13)

[Claims] 1. The first burner is provided on both sides of the first crater of the first burner.
In the burner for gas equipment provided with the 2nd burner which forms the 2nd crater which pinched the crater, the 2nd burner is independent of the 1st burner, and inhales fuel gas and primary air, A burner for gas equipment, comprising a common suction port for supplying to second craters provided on both sides. 2. A flat sheet metal first having a main crater at the upper end.
A burner for gas equipment, comprising: a burner; and a sheet metal second burner that forms a slit-shaped sleeve crater on both sides of the main crater, wherein the second burner is independent of the first burner. A burner for gas equipment, comprising a common suction port for sucking fuel gas and primary air and supplying the same to both sleeve craters provided on both sides of the main crater. 3. The method for manufacturing a gas appliance burner according to claim 1, wherein the first burner is formed by symmetrically punching and bulging a metal flat plate and bending the symmetric plane. The first burner flow path is formed by joining the non-bulging parts together, and the second burner is a cover formed by punching a sheet metal into a predetermined shape, bulging symmetrically, and bending the symmetric plane. At least the upper part of the first burner is wrapped with to form the common suction port, the second burner flow passage extending from the common suction port to the sleeve craters, and the sleeve craters sandwiching the main crater. And a method for manufacturing a burner for gas appliances. 4. The burner for a gas appliance manufactured by the manufacturing method according to claim 3, wherein one end of the first burner flow path is an intake port and extends horizontally from the one end to the other end side. A first burner inlet portion, and a first burner middle portion rising upward from the other end side portion of the first burner inlet portion,
A first burner outlet portion that extends over the entire width from the upper end of the first burner middle portion and is continuous with the first crater, and in a non-bulging portion between the first burner inlet portion and the first burner outlet portion, One end is the second burner suction port,
A method for manufacturing a burner for a gas appliance, characterized in that a horizontal tubular portion having the other end serving as a communication port to the flow path of the second burner is formed. 5. The method of manufacturing a burner for a gas device according to claim 4, wherein the communication port includes a group of small holes in the axial direction that are arranged in a row at the other end of the tubular portion. 6. The burner for gas equipment according to claim 5, wherein the group of small holes are arranged in two rows symmetrically on the left and right upper surfaces of the other end of the tubular portion. Method. 7. The burner for gas equipment according to claim 1, wherein the first crater comprises a row of slits arranged in parallel with each other. 8. The burner for gas equipment according to claim 1, wherein the first crater comprises a large number of small craters arranged in a plane. 9. The burner for gas equipment according to claim 8, wherein the plurality of small craters are formed by forming small holes in a matrix in a metal plate. 10. The burner for gas equipment according to claim 8, wherein the plurality of small craters are formed by alternately stacking strip-shaped metal corrugated plates and strip-shaped metal flat plates. 11. The plurality of small craters according to claim 8, wherein ribbons are formed by stacking strip-shaped metal plates having projections in a plane direction in a double manner, and two ribbons are stacked facing each other. A burner for gas appliances characterized by 12. The two ribbons according to claim 11, wherein both ends of each ribbon are sandwiched by binding gaps provided at both corners of the first crater of the first burner, and the upper ends of the ribbons are the same. A burner for a gas appliance, which is attached to the first crater in contact with a bridge provided on the second crater of the second burner. 13. The burner for gas equipment according to claim 1, wherein a partition zone is provided between the first crater and the second crater.