JPH0646132U - Burner equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] In a burner device in which the passage 5 for high-concentration premixed gas and the passage 7 for low-concentration premixed gas are formed next to each other, the self-combustibility and flame holding property of the low-concentration premixed gas flame are improved. It raises and suppresses the lift phenomenon of the flame and carries out low noise combustion. [Structure] A plurality of flame ports 4 are formed on a flame port forming surface on a low concentration gas passage 7. A cut-and-raised portion 57 is provided on the side wall of the low-concentration gas passage 7, and the cut-and-raised opening of the cut-and-raised portion 57 is used as the high-concentration gas introduction portion 56 to introduce the high-concentration premixed gas from the high-concentration gas passage 5. With the cut-and-raised part 57, the low-concentration premixed gas flowing through the low-concentration gas passage 7 is moved to the center side and ejected from the flame port 4 on the center side of the flame-forming surface, and introduced into the high-concentration gas introduction part 56. The premixed gas is mixed with the low-concentration premixed gas and ejected from the flame openings 4 on both ends of the flame opening forming surface,
A high-concentration premixed gas is mixed around the low-concentration premixed gas flame.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a burner device which is incorporated in a water heater, a bathtub or the like and burns fuel gas.

[0002]

[Prior art]

 As is well known, recently, a burner device for clean combustion, which produces less nitrogen oxides, has been actively developed, and an example of the developed burner device is shown in FIG.

In this development, a first burner 1 that burns a high-concentration premixed gas and a second burner 2 that burns a low-concentration premixed gas are arranged side by side. Gas nozzles 9 are arranged opposite to the gas inlets of the burners 1 and 2, air is taken into the fuel gas ejected from the gas nozzles 9 into the gas inlets, and the gas and air are premixed while passing through the inside of the burners. High-concentration premixed gas is ejected from the flame port 3 of the first burner 1, low-concentration premixed gas is ejected from the flame port 4 of the second burner 2, and high-concentration gas ejected from the flame port 3 The high-concentration premixed gas is burned by receiving the air in the adjacent low-concentration premixed gas, and the low-concentration premixed gas ejected from the flame port 4 receives the heat of the high-temperature premixed gas high temperature flame and burns. .

In this type of burner device, usually, the ratio of the introduced gas amounts of the first burner 1 and the second burner 2 is set to a ratio of 4: 6 to 3: 7, and a small amount of gas is used. The first burner, into which the amount is introduced, is set so that about 0.4 to 0.5 times the theoretical amount of air is taken in. On the other hand, the large amount of fuel gas introduced into the second burner 2 is set so that about 1.6 to 1.7 times the stoichiometric amount of air is taken in, and it is ejected from the flame port 3 of the first burner 1. The amount of the low-concentration premixed gas ejected from the flame port 4 of the second burner 2 is much larger than that of the high-concentration premixed gas, which causes the combustion surface of the burner to be mostly low. It is occupied by a concentration of premixed gas, which enables low temperature combustion and enables clean combustion with low nitrogen products.

[0005]

[Problems to be solved by the device]

 However, when the first burner 1 and the second burner 2 are arranged next to each other and burned as shown in FIG. 9, the low-concentration premixed gas ejected from the second burner 2 has an extremely large air amount. Since it is so many and lean, it cannot be burned as it is, and it is burned by receiving the heat of the first flame 11 having a high temperature of the high-concentration premixed gas of the adjacent first burner 1. The second flame 12 is formed in the vicinity of the highest flame temperature portion near the top of the flame 11, and the second flame 12 is lifted from the flame port 4 of the second burner 2 by the interval L 2 of the flame formation start portion. (Lifting), this lift phenomenon had a problem that the noise of combustion became extremely loud.

The present invention has been made in order to solve the above-mentioned conventional problems, and an object thereof is to perform clean combustion with a small amount of nitrogen products, suppress a lift phenomenon of a flame, and generate a combustion noise. To provide a quiet burner device.

[0007]

[Means for Solving the Problems]

 The present invention is configured as follows to achieve the above object. That is, according to the present invention, a high-concentration gas passage through which a premixed gas with a high gas concentration passes and a low-concentration gas passage through which a premixed gas with a low gas concentration passes are arranged side by side, forming a flame port on the low-concentration gas passage. In a burner device in which a plurality of flame openings communicating with the low-concentration gas passage are formed on the surface, a high-concentration gas introduction part for introducing a high-concentration premixed gas from the high-concentration gas passage is provided in the low-concentration gas passage. The high-concentration premixed gas introduced at this high-concentration gas introduction part is introduced to the flame openings on both sides of the flame opening formation surface, and the low-concentration premixed gas flow is directed to the center of the flame opening formation surface. It is configured as a feature that a gas diversion means for leading to is provided.

Further, first, the gas flow dividing means cuts and raises the side wall of the low-concentration gas passage inward to cause the flow of the low-concentration premixed gas in the low-concentration gas passage to the center side of the flame port forming surface. The high-concentration gas is introduced through the cut-and-raised opening of the cut-and-raised portion, and secondly, the gas shunting means is provided for the low-concentration premixed gas passing through the low-concentration gas passage. A nozzle-shaped flow distributor has a cross section that has a gas intake part that takes in gas and a throttle part that throttles the taken-in low-concentration premixed gas and guides it toward the center of the flame port formation surface. A high-concentration gas introducing portion is provided on the side wall of the low-concentration gas passage which is opposed to the low-concentration gas passage, and thirdly, the gas flow dividing means is constituted by making the cross-sectional shape of the low-concentration gas passage into a T-shape. High due to the T-shaped overhang An upper surface of the concentration gas passage is covered, and a high concentration gas introduction portion is provided on the bottom wall of the T-shaped overhang portion. Each of these gas flow dividing means is also a characteristic configuration of the present invention. . In addition, a characteristic feature is that a flame port for ejecting and burning the high-concentration premixed gas is formed on the upper surface of the high-concentration gas passage.

[0009]

[Action]

 In the present invention having the above-mentioned configuration, the low-concentration premix gas supplied to the low-concentration gas passage is injected into the combustion space from the flame port on the flame-portion forming surface on the low-concentration gas passage to perform combustion. At this time, the high-concentration premixed gas in the high-concentration gas passage is guided to the low-concentration gas passage side in the high-concentration gas introduction part, and this guided high-concentration premixed gas is introduced into the low-concentration gas passage in the low-concentration gas passage. While mixing with the mixed gas, the low-concentration premixed gas flowing through the low-concentration gas passages is ejected by being guided to the flame openings on both sides of the flame opening formation surface by the gas distribution means, and the flame openings are formed by the gas distribution means. It is guided by the flame outlet on the center side of the surface and ejects.

As a result, a flame of the low-concentration premixed gas is formed in the central portion of the upper side of the flame port forming surface, and a zone of the premixed gas having a higher concentration than that is formed in the peripheral portion of the flame. As a result, the self-combustibility of the flame of the low-concentration premixed gas is promoted, and its flame holding property is also enhanced, and the flame of the low-concentration premixed gas is formed immediately after it exits the flame mouth, Lift phenomenon is suppressed and low noise clean combustion is performed.

[0011]

Embodiment An embodiment of the present invention will be described below with reference to the drawings. In the following description of the embodiments, the same name parts as those described in the conventional example are designated by the same reference numerals, and detailed description thereof will be omitted. FIG. 1 shows a first embodiment of the present invention.

In this embodiment, a first burner 1 and a second burner 2 are arranged side by side, and the inside of the first burner 1 is formed in a high-concentration gas passage 5. The burner 1 has no flame outlet for forming a flame. The inside of the second burner 2 is a low-concentration gas passage 7. The upper side of the low-concentration gas passage 7 is a flame port forming surface, and a plurality of flame ports 4 are formed on this flame port forming surface. Has been done. A communication hole 43 is formed in a side wall of the first burner 1, and a side wall of the second burner 2 facing the communication hole 43 is provided with a cut-and-raised portion 57 as a flow dividing means which is cut and raised inward. The cut-and-raised opening of the cut-and-raised part 57 serves as the high-concentration gas introduction part 56. By providing the high-concentration gas inlet portion 56 and the cut-and-raised portion 57, the high-concentration gas passage 5 from the high-concentration gas passage 5 of the first burner 1 to the side of the low-concentration gas passage 7 of the second burner 2 is elevated along the cut-and-raised portion 57. The premixed gas with a high concentration enters, so that the low-concentration premixed gas and the high-concentration premixed gas are mixed at the left and right ends of the gas passage 7 to produce a medium-concentration premixed gas. It gushes out from the flame mouths on both ends of the group of mouths 4.

On the other hand, the low-concentration premixed gas flowing through the low-concentration gas passage 7 toward the flame-portion forming surface is moved toward the center of the passage by the cut-and-raised portion 57, and the flame-port 4 on the center-side of the flame-port forming surface is formed. A low-concentration premixed gas is ejected from the ground. In this way, since the high-concentration premixed gas is positively mixed from around the low-concentration premixed gas ejected from the center side of the flame formation surface, the self-combustion property and flame holding property of the low-concentration premixed gas are improved. Therefore, the lift phenomenon of the second flame (low-concentration premixed gas flame) 12 is suppressed, and low-noise combustion becomes possible.

FIG. 2 shows a second embodiment of the present invention. In this embodiment, the side wall of the high-concentration gas passage 5 to which the high-concentration premixed gas of the first burner 1 is supplied forms a communication hole 58, and the second burner 2 facing the communication hole 58 is formed. A side wall of the second burner has a communication hole 59 as a high-concentration gas introduction portion, and a diversion plate 60 is provided in the low-concentration gas passage 7 of the second burner 2. The flow dividing plate 60 has a substantially nozzle-shaped cross-section, a base side thereof is a gas intake portion 63 for taking in the low-concentration premixed gas flowing through the gas passage 7, and a tip side thereof is a flow of the low-concentration premixed gas. It is the squeezing section 64 for squeezing. The communication hole 59 is formed at a position facing the outer surface of the throttle portion 64, and the space portion 65 formed by the throttle portion 64 and the side wall surface of the low-concentration gas passage 7 has flame openings 4 at both ends of the flame opening surface. The high-concentration premixed gas introduced from the high-concentration gas passage 5 side through the communication holes 58 and 59 is ejected from the flame ports 4 on both ends while being mixed with the low-concentration premixed gas. .

The flow dividing plate 60 generates a medium-concentration premixed gas produced by mixing a high-concentration premixed gas introduced through the communication holes 58 and 59 with a low-concentration premixed gas in the gas passage 7. The flow is divided into a flow leading to the flame ports 4 at both ends of the group of the flame ports 4 and a low-concentration premixed gas passing through the center of the low-concentration gas passage 7 to the flow leading to the flame ports 4 at the center of the flame port forming surface. As a result, a medium-concentration gas zone is formed in the area of the flame ports 4 on both sides of the flame port group of the second burner 2, which allows the low-concentration premixed gas flame to be self-sustaining and flame-retardant. To suppress the occurrence of lift and enable low-noise combustion.

FIG. 3 shows the configuration of the third embodiment of the present invention. In this embodiment, the upper end surface of the first burner 1 is formed lower than the upper end surface of the second burner 2 by a step, and the cross-sectional shape of the low concentration gas passage 7 of the second burner 2 is T-shaped. The T-shaped projecting portion covers the upper end surface of the first burner 1. Then, a communication hole 65 is formed on the top wall surface of the first burner 1, and the high-concentration gas introduction portion is formed on the bottom wall of the T-shaped projecting portion on the second burner 2 side facing the communication hole 65. A communication hole 66 is provided. In this embodiment, the T-shaped passage itself functions as a gas flow dividing means. In this embodiment, the high-concentration premixed gas supplied to the first burner 1 is introduced from the communication holes 65 and 66 into the T-shaped projecting region 68 of the second burner 2, and the gas passage 7 lowers. Mix with the premixed gas to produce a premixed gas of medium concentration. Then, the medium-concentration premixed gas is ejected upward from the flame openings 4 on the left and right ends of the flame opening forming surface of the second burner 2 through the space of the T-shaped overhang area 68.

On the other hand, the low-concentration premixed gas that is directed upward from the base portion 67 side of the low-concentration gas passage 7 is guided to the center side of the flame port formation surface through the center portion between the T-shaped left and right overhang regions 68. He spouts upward from the group of flame nozzles 4 in the center. Also in the case of this embodiment, a medium concentration gas distribution zone is formed on both end sides of the flame forming surface of the second burner 2, and the medium concentration premixed gas is at the base side of the low concentration premixed gas flame. As described above, the lift phenomenon of the flame 12 of the low-concentration premixed gas is prevented and combustion with low noise becomes possible, as in the case of each of the above embodiments.

The present invention is not limited to the above-mentioned embodiments, and various embodiments can be adopted. For example, in each of the above embodiments, the first burner 1 was not provided with a flame port, but of course, as shown in FIGS. 4 to 6, the flame port 3 is provided above the high-concentration gas passage 5 of the burner 1. You may do it. FIG. 4 shows a modification of the first embodiment, in which a flame port 3 is provided above the burner 1. Further, FIG. 5 shows a modification of the second embodiment, in which the first burner 1 is similarly provided with the flame port 3. Further, FIG. 6 shows a modification of the third embodiment, in which a flame port 3 is formed in the central portion of the top wall surface of the first burner 1 and the height of the flame ejected from the flame port 3 is increased. The concentration premixed gas is jetted upward through the passage 67 between the adjacent second burners 2.

As a result, the low-concentration premixed gas is ejected to the central portion of the second burner by the gas diverting means, and the medium-concentration premixed gas is ejected to the adjacent side thereof by the gas diverting means. Since the high-concentration premixed gas is ejected from the flame port 3 of the first burner 1, the premixed gas with different gas concentrations is sequentially ejected from the low concentration to the high concentration on the flame formation surface. The flame transfer property between the mixed gases becomes extremely good, and the self-combustion property and flame holding property of the low-concentration premixed gas flame are enhanced as in each of the above-mentioned examples, the lift phenomenon of the flame is suppressed, and the low noise is suppressed. Burning of is also possible.

Further, as described above, when the flame burner 3 is formed in the first burner and the flame burner 4 is formed in the second burner 2, the first flame 11 of the low-concentration premixed gas and the high flame 11 are formed. A mesh or the like is provided on the upper side of the boundary region between the concentrated premixed gas and the second flame 12, and the high-concentration premixed gas and the low-concentration premixed gas ejected from the flame nozzles 3 and 4 are caused to interfere with each other. The mixing may be accelerated.

Further, in each of the above-mentioned embodiments, the first burner 1 and the second burner 2 are arranged in a flat state, that is, in a flat state. However, as shown in FIG. The first burner row 61 and the second burner row 62, in which the first and second burners 2 are arranged side by side, may be arranged to face each other in a substantially V shape. In this case, the fuel gas is jetted and supplied individually from the gas nozzles to the first burner 1 and the second burner 2 of each burner row 61, 62, so that each burner has a space between the gas introduction port and the flame port. Although the premixed gas may be produced, in the example of FIG. 7, the box-shaped premixing device 26 is connected to the burner rows 61 and 62.

The pre-mixing device 26 includes two-stage swirling mixers 27 a and 27 b. The lower-stage swirling mixer 27 a responds to the fuel gas supplied from the gas supply pipe 31 from the fan to the frame wall 28. When the air supplied through the air holes 30 of the air is taken in, a swirling force is applied to this air to collide with the fuel gas in the direction orthogonal to swirl and mix, thereby producing a high-concentration premixed gas. Similarly, the swirling mixer 27b in the upper stage swirls and mixes the air and the fuel gas by causing swirling air to collide with the fuel gas supplied by the gas supply pipe 31 from a direction orthogonal to the premixed gas with a low concentration. produce. A gas passage for the high-concentration premixed gas and a gas passage for the low-concentration premixed gas are defined in the box-shaped case 32, and the high-concentration premixed gas produced by the swirling mixer 27a is in the box-shaped case. The low-concentration premixed gas, which is supplied to the first burner 1 of each burner row 61, 62 through the high-concentration gas passage in 32 and is produced in the swirling mixer 27b, is the low-concentration premixed gas in the box-shaped case 32. It is supplied to the second burner 2 of each burner row 61, 62 via a gas passage.

In this way, by arranging the burner rows 61 and 62 to face each other in a V shape, the combustion gas in each burner row 61 and 62 rises up along the V-shaped slope of the combustion surface, A negative pressure zone is formed in the central part of the V-shape, and a downward exhaust gas flow is generated in this central part, and this exhaust gas recirculation flow effectively performs slow combustion, resulting in more nitrogen oxides. Clean combustion with less generation can be achieved. In addition, by arranging the burner rows 61 and 62 in a V shape, the number of flame openings 3 and 4 can be increased, and this reduces the load on the combustion openings, thus reducing combustion noise. It gets smaller.

Further, in each of the above-mentioned embodiments, one first burner 1 and one second burner 2 are alternately arranged, but, for example, one first burner 1 is arranged next to the first burner 1. Two second burners 2 may be arranged, or one second burner 2 may be arranged next to the two first burners 1, and the first and second burners arranged side by side. The number of burners in each does not have to be one at a time.

Further, in each of the above-described embodiments, the single burner 1 and the second burner 2 are arranged side by side, but unlike this, for example, in a box-shaped burner case, high concentration The gas passage and the low-concentration gas passage are partitioned so as to be adjacent to each other, the flame port 4 is provided on the low-concentration gas passage, and the high-concentration gas introducing portion of each of the above-mentioned embodiments and the gas diversion means are provided in the gas passage. The configuration may be provided with and.

[0026]

[Effect of device]

 According to the present invention, a high-concentration gas passage and a low-concentration gas passage are arranged side by side, and a plurality of flame openings are formed on a flame-portion forming surface on the low-concentration gas passage. The high-concentration gas introduction part that introduces the high-concentration premixed gas from the passage and the introduced high-concentration premixed gas are introduced to the flame openings on both sides of the flame opening formation surface, and the low-concentration premixed gas is introduced into the flame opening formation surface. Since a gas diversion means for leading to the central side of the low concentration premixed gas ejected to the center side of the flame mouth formation surface is provided around the flame, the low concentration premixed gas and high The medium-concentration premixed gas mixed with the concentration-premixed gas can be ejected to actively mix the medium-concentration premixed gas from the root of the low-concentration premixed gas flame along the outer surface. The self-combustion property and flame holding property of the concentration premixed gas flame are remarkably improved. The lift phenomenon of the low concentration premixed gas flame is effectively suppressed, thereby enabling quiet combustion noise.

[Brief description of drawings]

FIG. 1 is a structural explanatory view showing a first embodiment of a burner device according to the present invention.

FIG. 2 is an explanatory view showing a second embodiment of the present invention.

FIG. 3 is an explanatory view showing a third embodiment of the present invention.

FIG. 4 is an explanatory diagram of a modified example of the first embodiment.

FIG. 5 is an explanatory diagram of a modified example of the second embodiment.

FIG. 6 is an explanatory diagram of a modification of the third embodiment.

FIG. 7 is an explanatory view showing another embodiment in which burners are arranged in a substantially V shape.

FIG. 8 is a perspective explanatory view of a conventional burner device.

FIG. 9 is an explanatory diagram of a flame formation state of the burner device.

[Explanation of symbols]

 1 First burner 2 Second burner 5 High-concentration gas passage 7 Low-concentration gas passage 56 High-concentration gas introduction part 57 Cut-and-raised part 60 Flow distribution plate 63 Gas intake part

Claims (5)

[Scope of utility model registration request] 1. A flame outlet forming surface on a low-concentration gas passage, in which a high-concentration gas passage through which a premixed gas with a high gas concentration passes and a low-concentration gas passage through which a premixed gas with a low gas concentration passes are arranged side by side. In the burner device in which a plurality of flame openings communicating with the low-concentration gas passage are formed, a high-concentration gas introducing portion for introducing a high-concentration premixed gas from the high-concentration gas passage into the low-concentration gas passage, A gas that introduces the high-concentration premixed gas introduced in the high-concentration gas introduction part to the flame openings on both ends of the flame opening forming surface, and guides the flow of the low-concentration premixing gas to the flame opening on the center side of the flame opening forming surface. A burner device provided with a flow dividing means. 2. The gas diverting means is constituted by a cut-and-raised portion which cuts and raises a side wall of the low-concentration gas passage inward to bring the flow of the low-concentration premixed gas in the low-concentration gas passage toward the center side of the flame port forming surface. The burner device according to claim 1, wherein the cut-and-raised opening of the cut-and-raised part is a high-concentration gas introduction part. 3. The gas diverting means includes a gas intake part for taking in the low-concentration premixed gas passing through the low-concentration gas passage, and a throttle part for squeezing the taken-in low-concentration premixed gas to guide it toward the center of the flame mouth forming surface. 2. The burner device according to claim 1, wherein a cross section having is formed by a flow dividing plate having a nozzle shape, and a high-concentration gas introduction portion is provided on a side wall of the low-concentration gas passage facing the outer surface of the throttle portion. 4. The gas distribution means is constituted by making the cross-section of the low-concentration gas passage into a T-shape, and the T-shaped overhanging portion covers the upper surface of the high-concentration gas passage, thereby forming the T-shape. The burner device according to claim 1, wherein a high-concentration gas introduction portion is provided on a bottom wall of the overhang portion. 5. The burner device according to claim 1, wherein a flame port for ejecting and burning the high-concentration premixed gas is formed on the upper surface of the high-concentration gas passage.