CN107869717B

CN107869717B - Burner device

Info

Publication number: CN107869717B
Application number: CN201710793930.0A
Authority: CN
Inventors: 宫川晴徳; 马越亮辅; 唐木竜也
Original assignee: Noritz Corp
Current assignee: Noritz Corp
Priority date: 2016-09-26
Filing date: 2017-09-05
Publication date: 2020-08-11
Anticipated expiration: 2037-09-05
Also published as: JP6765634B2; JP2018054151A; CN107869717A

Abstract

The invention provides a burner device which can properly reduce the number of components and reduce the manufacturing cost. In the burner device (B), a gas inlet forming part (12) of a burner (1) is set to penetrate through a through hole (22) of a front plate part (20) of a burner shell (2) and protrude to the front of the front plate part (20), a damper (4) is abutted to a front end part (12a) of the gas inlet forming part (12), a second gap part (7) between the damper (4) and the front plate part (20) is communicated with a communicating part (44) of a combustion air supply path (6), and a communicating part (7a) is arranged at a position avoiding the front of a fuel gas spraying nozzle (50).

Description

Burner device

Technical Field

The present invention relates to a burner (burner) device suitable for use as a component of a gas-fired water heating device, for example.

Background

As specific examples of the burner device, there are burner devices described in patent documents 1 to 3, etc., and fig. 9 shows an example of a conventional burner device having a similar structure to these burner devices.

In the burner apparatus Be shown in fig. 9, the burner 1 is housed in the burner housing 2, and a gas inlet 10a and a gas inlet 10b for introducing fuel gas and combustion air of the burner 1 into the interior are set so as to communicate with a through-hole 22a and a through-hole 22b provided in the front plate portion 20 of the burner housing 2. The fuel gas supply head 5 is attached to the front surface of the front plate portion 20, and the fuel gas is injected from the fuel gas injection nozzle 50 of the fuel gas supply head 5 toward the gas inlet 10a and the gas inlet 10b of the burner 1.

On the other hand, a damper (damper)4 for adjusting the substantial opening sizes of the through-

holes

22a and 22b is mounted in a superimposed manner on the front plate portion 20 of the burner housing 2, and combustion air is supplied from the fan 3 to a gap portion 6e between the damper 4 and the fuel gas supply head 5. Therefore, combustion air is appropriately supplied to the gas inlet 10a and the gas inlet 10b of the combustor 1 in addition to the fuel gas, and the fuel gas can be combusted on the burner port surface 11 of the combustor 1.

However, as described below, the above-mentioned prior art has room for improvement.

That is, the burner device Be described above needs to appropriately prevent a part of the fuel gas (unburned gas) discharged from the fuel gas supply head 5 from flowing into the burner housing 2 through the gap formed between the front plate portion 20 and the gas inlet port forming portion 12. If the unburned gas flows into the burner housing 2 through the gap, the following problems occur: the HC value increases and the like when the burner device Be is driven for combustion.

Here, the space 6e is a region in which the ejection pressure of the combustion air from the fan 3 acts, and therefore the pressure inside the combustor case 2 is relatively lower than the pressure of the space 6 e. Therefore, the fuel gas easily flows into the combustor case 2 from the gap 6 e. Therefore, conventionally, as a means for preventing such a situation, a gasket 98 for sealing is interposed between the front plate portion 20 and the front end portion of the gas inlet forming portion 12.

However, from the viewpoint of reducing the total number of components of the burner apparatus Be, improving productivity, and reducing manufacturing cost, it is desirable not to use the above-described gasket 98 for sealing. Therefore, there is still room for improvement in the above-described aspects.

[ Prior art documents ]

[ patent document ]

[ patent document 1] Japanese patent laid-open No. 2013-242080

[ patent document 2] Japanese patent laid-open No. 2000-249314

[ patent document 3] Japanese patent laid-open No. 2003-176904

Disclosure of Invention

[ problems to be solved by the invention ]

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a burner device capable of reducing the number of components and manufacturing cost appropriately.

[ means for solving the problems ]

In order to solve the above problems, the present invention adopts the following technical means.

The burner apparatus provided by the present invention comprises: a burner housing which houses a burner therein and includes a front plate portion provided with a through hole corresponding to a gas inlet of the burner; a damper provided on the front surface of the front plate portion and including an opening portion for adjusting ventilation corresponding to the gas inlet port; a fuel gas supply head provided on the front surface of the damper and including a fuel gas ejection nozzle that ejects fuel gas to the ventilation adjusting opening and the gas inlet; and a combustion air supply path including a first gap portion formed between the fuel gas supply head and the damper, and guiding combustion air ejected from a separately provided fan to the first gap portion, wherein: the gas inlet forming portion of the burner is set to penetrate the through hole of the front plate portion and protrude forward of the front plate portion, the damper abuts against a front end portion of the gas inlet forming portion, and a second gap portion is formed between the damper and the front plate portion, and the burner device further includes a communicating portion that is provided at a position avoiding a front surface of the fuel gas ejection nozzle and that communicates the second gap portion and the combustion air supply path with each other.

With this configuration, the following effects can be obtained.

That is, the first gap between the fuel gas supply head and the damper is not in a positional relationship directly adjacent to the inside of the burner housing, and the second gap is interposed between the first gap and the inside of the burner housing. Here, since the second void communicates with the first void via the communicating portion, the pressure is substantially the same as the pressure of the first void. Therefore, even if there is a gap in the contact portion between the damper and the tip end portion of the gas inlet forming portion of the burner, the fuel gas is inhibited from flowing from the first gap portion to the second gap portion. Since the communicating portion is disposed so as to avoid the front surface of the fuel gas jetting nozzle, the fuel gas does not actively enter the second space through the communicating portion. Therefore, the fuel gas is also inhibited from flowing into the combustor case from the second gap portion.

Therefore, according to the present invention, it is possible to prevent a part of the fuel gas discharged from the fuel gas supply head from flowing into the inside of the burner housing improperly without using a gasket for sealing. As a result, the number of components can be reduced, the productivity of the burner device can be improved appropriately, and the manufacturing cost can be reduced appropriately as compared with the conventional art.

In the present invention, it is preferable that a communicating hole portion is provided as the communicating portion, and the communicating hole portion is provided so as to penetrate the damper so that the first gap portion and the second gap portion communicate with each other.

The connecting hole portion can be easily provided in the damper without using an additional member or the like, and is more preferable in terms of promoting reduction in manufacturing cost.

In the present invention, it is preferable that a region of a part of the combustion air supply path is located below the second gap, a lower opening portion including the second gap is provided as the communicating portion, and the lower opening portion is opened to face the region of the part of the combustion air supply path.

Similarly to the communication hole, the lower opening of the second void can be easily formed without using an additional member or the like, and it is preferable to facilitate reduction of manufacturing cost.

In the present invention, it is preferable that a plurality of projections in a bent sheet shape or a punched step shape, which project toward the front plate portion and have front end portions abutting against the front plate portion, be integrally formed on the damper.

According to this configuration, the second gap portion can be formed appropriately while stabilizing the relative positional relationship between the damper and the front plate portion by the plurality of protruding portions. In addition, since the plurality of protruding portions are integrally formed on the damper, the number of components can be prevented from increasing.

Other features and advantages of the present invention will become more apparent from the following description of embodiments of the invention with reference to the accompanying drawings.

Drawings

Fig. 1 is an exploded perspective view showing an example of a burner apparatus of the present invention.

Fig. 2 is a perspective view showing an example of a burner used in the burner apparatus shown in fig. 1.

Fig. 3 is a sectional view showing a main part of the burner apparatus shown in fig. 1 in an assembled state.

Fig. 4 is an exploded sectional view of a main portion of fig. 3.

Fig. 5(a) is a sectional view of a main part of a portion different from fig. 3 in an assembled state of the burner apparatus shown in fig. 1, and fig. 5(b) is a V-V sectional view of fig. 5 (a).

Fig. 6 is an exploded front view showing a main portion of a burner housing and a damper of the burner apparatus shown in fig. 1.

Fig. 7(a) is a sectional view taken along VIIa-VIIa in fig. 6, fig. 7(b) is a sectional view taken along VIIb-VIIb in fig. 6, and fig. 7(c) is a sectional view taken along VIIc-VIIc in fig. 6.

Fig. 8 is a sectional view of a main portion in a state where a damper is attached to the combustor case shown in fig. 1.

Fig. 9 is a sectional view showing a main part of an example of a conventional technique.

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the following description, for the sake of easy understanding, the same or similar elements as those in the related art shown in fig. 9 are denoted by the same reference numerals as those in the related art.

The burner apparatus B shown in fig. 1 is used, for example, as a component of a gas water heater, and is configured to heat boiled water, and includes: a combustor case 2 that accommodates a plurality of combustors 1 shown in fig. 2 therein; a fan 3 mounted on a lower portion of the burner housing 2; a damper 4 separated from the combustor case 2; and a fuel gas supply header 5. A heat exchanger HE is placed on the upper portion of the burner housing 2, and the boiling water supplied to the heat exchanger HE can be heated by causing the combustion gas generated by the burner device B to act on the heat exchanger HE.

In fig. 2, the burner 1 is flat, includes a gas inlet 10a and a gas inlet 10b at one end for guiding fuel gas and combustion air to the inside, and has a port surface 11 on the upper surface for burning the fuel gas. The burner 1 of the present embodiment is capable of realizing low NO_XIn the so-called rich-lean burner, the gas inlet 10a having a larger diameter is used for the lean gas, and the gas inlet 10b having a smaller diameter is used for the rich gas. A plurality of burners 1 as described above are housed in the burner housing 2 in parallel along the lateral width direction of the burner housing 2. However, as shown in detail in fig. 1, a plurality of through holes 22 are provided in the front plate portion 20 of the burner housing 2 in parallel along the lateral width direction of the burner housing 2, and the shape and size of the through holes 22 correspond to the gas inlet forming portion 12 in which the gas inlet 10a and the gas inlet 10b of the burner 1 are formed.

As shown in fig. 3, the gas inlet forming portion 12 of each burner 1 penetrates the through-hole 22 and protrudes forward (leftward in the drawing) from the front plate portion 20. The gas inlet forming section 12 and the through-hole 22 are fitted to each other so that a gap is not formed between an inner surface portion of the through-hole 22 and an outer surface portion of the gas inlet forming section 12 as much as possible. As shown in fig. 2, the gas inlet forming portion 12 includes a plurality of standing pieces 12b extending in the vertical height direction in addition to a cylindrical wall portion surrounding the gas inlet 10a and the gas inlet 10 b. The through-hole 22 of the front plate portion 20 shown in fig. 3 and 4 may have a shape through which the plurality of standing piece portions 12b described above are inserted. In fig. 3 to 5(a) and 5(b),

reference numerals

90 and 91 denote a spark plug and a flame rod (flamerod), respectively.

The damper 4 is originally a member for adjusting the supply amount of the combustion air to the gas inlet 10a and the gas inlet 10b of the combustor 1, and this damper 4 is formed by performing press working on a metal plate. As shown in fig. 6, 7(a), 7(b), and 7(c), the damper 4 includes a main plate portion 40 standing upright, an upper plate portion 41 connected to an upper end portion of the main plate portion 40, and a curved plate portion 42 provided continuously to a front end portion of the upper plate portion 41. The main plate portion 40 includes a plurality of communicating holes 44 as an example of the "communicating portion" in the present invention, a plurality of bent sheet-shaped protruding portions 45 and a pressed stepped protruding portion 46 provided at both ends in the lateral width direction of the main plate portion 40 or in the vicinity thereof, in addition to a plurality of ventilation adjusting openings 43a and a plurality of ventilation adjusting openings 43b corresponding to the plurality of gas inlets 10a and the plurality of gas inlets 10b (see fig. 7 (c)).

As shown in fig. 3, 5(a) and 5(b), the damper 4 is attached to the combustor case 2 such that the main plate portion 40 abuts against the front end portion 12a of the gas inlet forming portion 12 of the combustor 1. As a method of mounting the damper 4, the following method is adopted: as shown in fig. 8, the protruding portion 45 and the protruding portion 46 of the damper 4 are brought into contact with the front surface of the front plate portion 20, and the protruding portion 46 is fastened to the front plate portion 20 using a screw 95 such as a screw. According to this method, the main plate portion 40 of the damper 4 can be stably brought into contact with the distal end portion 12a of the gas inlet forming portion 12, and the second gap portion 7 described later can be appropriately formed. Although not illustrated, as a method of attaching the damper 4, a method of fixing the upper plate portion 41 of the damper 4 to the horizontal plate portion 27 of the combustor case 2 by screws may be used in combination. According to the above-described mounting structure of the damper 4, the substantial opening sizes of the plurality of

gas inlet ports

10a and 10b shown in fig. 6 (the opening sizes of the portions not closed by the damper 4, that is, the sizes of the ventilation adjusting opening 43a and the ventilation adjusting opening 43 b) can be accurately set to desired sizes. Accordingly, the amount of the combustion air introduced into the gas inlet 10a and the gas inlet 10b can be set to an amount optimal for the combustion driving of the combustor 1 or an amount close to the optimal amount. Further, the contact portion between the tip end portion 12a of the gas inlet forming portion 12 and the damper 4 functions as a simple seal portion that prevents the fuel gas from flowing from the first gap portion 6a described later into the second gap portion 7.

In fig. 3, the fuel gas supply head 5 ejects fuel gas supplied through a gas pipe, not shown, from a plurality of fuel gas ejection nozzles 50 to the gas inlet 10a and the gas inlet 10b of the burner 1. The fuel gas supply head 5 is attached to the burner housing 2 so as to be in contact with the upright plate portion 28, the pair of left and right flange portions 29 (see fig. 1), and the curved plate portion 42 of the damper 4 at the lower portion of the burner housing 2 through the sealing packing 97.

The fuel gas discharge nozzle 50 is located in the first gap 6a between the fuel gas supply head 5 and the damper 4, but a combustion air supply path 6 is formed in the bottom portion inside the burner case 2, and the combustion air supply path 6 guides the combustion air discharged from the fan 3 to the first gap 6 a. The first gap 6a corresponds to a part of the combustion air supply path 6.

As shown in detail in fig. 5(a) and 5(b), the second gap 7 between the damper 4 and the front plate 20 communicates with the first gap 6a via the plurality of communicating holes 44. Therefore, the pressure P1 and the pressure P2 of the first gap 6a and the second gap 7 are substantially the same. The plurality of communicating holes 44 are provided at positions avoiding the front surface of the fuel gas discharge nozzle 50 so that the fuel gas is not discharged from the fuel gas discharge nozzle 50 to the communicating holes 44. Preferably, as shown in fig. 6, the connection holes 44 are provided in an intermediate region between the gas inlet 10a and the gas inlet 10b or in the vicinity of the intermediate region. The above is preferable in that the pressure in the vicinity of the gas inlet forming portion 12 in the second gap 7 is set to a pressure closer to the pressure P1.

The combustion air supply path 6 is formed such that a midway portion thereof passes below the second gap 7, and the second gap 7 includes a lower opening 7a, and the lower opening 7a opens toward the midway portion of the combustion air supply path 6. The lower opening 7a corresponds to another example of the "communicating portion" in the present invention, and preferably extends in a row in the lateral width direction of the burner housing 2, and has a large opening area. By forming the lower opening portion 7a, the pressure P2 of the second gap 7 is more reliably made substantially the same as the pressure P1 (the pressure in the middle portion of the combustion air supply path 6 is approximately the same as the pressure P1 of the first gap 6 a).

Next, the operation of the burner device B will be described.

First, as described with reference to fig. 5(a) and 5(b), since the connecting hole portion 44 and the lower opening portion 7a exist, the pressure P2 of the second gap portion 7 is substantially the same as the pressure P1 of the first gap portion 6 a. Therefore, even if the damper 4 and the distal end portion 12a of the gas inlet port-forming portion 12 are not sealed with a sealing gasket, a slight gap is formed between the damper 4 and the distal end portion 12a of the gas inlet port-forming portion 12, and the fuel gas present in the first gap portion 6a (the fuel gas that does not directly enter the gas inlet port 10a or the gas inlet port 10 b) does not or hardly actively flow into the second gap portion 7 through the gap. The second gap 7 can be a region into which the fuel gas does not enter. Therefore, even if a gap is formed at the fitting portion between the gas inlet forming portion 12 and the through hole 22 of the front plate portion 20 without using a sealing gasket to seal the fitting portion, the fuel gas is appropriately prevented from flowing into the combustor case 2 through the gap.

Therefore, in the present embodiment, the following disadvantages can be prevented: the unburned fuel gas flows into the combustor case 2 improperly, so that the HC value at the time of fuel combustion increases. Since it is not necessary to use a seal gasket as a component for preventing the fuel gas from flowing into the combustor case 2 improperly, for example, the number of components is reduced, and the assembly work of the seal gasket is omitted, whereby the manufacturing cost of the combustor apparatus B can be reduced.

In the present embodiment, since both the communication hole portion 44 and the lower opening portion 7a are provided as a method of making the pressure P2 of the second gap portion 7 substantially the same as the pressure P1 of the first gap portion 6a (combustion air supply path 6), the pressure P1 and the pressure P2 can be made substantially the same, and the reliability thereof can be improved. Further, since the lower opening portion 7a communicates with the region of the combustion air supply path 6 upstream in the air supply direction from the first gap 6a, the pressure P2 of the second gap 7 can be adjusted as long as the pressure P1' in the upstream region is higher than the pressure P1 of the first gap 6a

The relationship P2 > P1 was defined. According to such a relationship, the effect of preventing the fuel gas from entering the second gap 7 from the first gap 6a can be further enhanced.

The present invention is not limited to the contents of the above embodiments. The specific structural design of each part of the burner apparatus of the present invention can be variously modified within the scope of the intended purpose of the present invention.

In the above-described embodiment, both the communication hole portion 44 and the lower opening portion 7a are provided as the communication portion in the present invention, but a configuration in which only one of the both is provided may be adopted. Further, the combustion air supply passage 6 may communicate with the second gap 7 through a passage different from the communication hole 44 or the lower opening 7 a. In the case where the communicating hole portion 44 is provided, the communicating hole portion 44 may be provided in a state of being connected to the ventilation adjusting opening portion 43a and the ventilation adjusting opening portion 43b, instead of in a state of being separated from the ventilation adjusting opening portion 43a and the ventilation adjusting opening portion 43 b.

The burner is not necessarily a rich burner, and a different type of burner from the rich burner can be used. In general, a plurality of burners are housed in a burner case, but the present invention is also applicable to a case where only one burner is housed in a burner case, and thus such a configuration can be adopted.

The burner device of the present invention is not limited to use in a hot water system, and its specific application is not limited, and it can be used in, for example, a heater system, an incinerator system, or the like.

Claims

1. A burner apparatus, comprising:

a burner housing which houses a burner therein and includes a front plate portion provided with a through hole corresponding to a gas inlet of the burner;

a damper provided on the front surface of the front plate portion and including an opening portion for adjusting ventilation corresponding to the gas inlet port;

a fuel gas supply head provided on the front surface of the damper and including a fuel gas ejection nozzle that ejects fuel gas to the ventilation adjusting opening and the gas inlet; and

a combustion air supply path including a first gap portion formed between the fuel gas supply head and the damper and guiding combustion air ejected from a separately provided fan to the first gap portion,

the burner apparatus is characterized in that:

a gas inlet forming portion of the burner is set to penetrate the through hole of the front plate portion and protrude to the front of the front plate portion,

the damper is in contact with a front end portion of the gas inlet forming portion, and a second gap portion is formed between the damper and the front plate portion,

the burner device further includes a communicating portion that is provided at a position avoiding a front surface of the fuel gas ejection nozzle and that communicates the second gap portion and the combustion air supply path with each other.

2. The burner apparatus of claim 1, wherein:

the damper includes a communicating hole portion as the communicating portion, and the communicating hole portion is provided so as to penetrate the damper so that the first gap portion and the second gap portion communicate with each other.

3. The burner apparatus of claim 1 or 2, wherein:

a region of a part of the combustion air supply path is located on a lower side of the second gap portion,

a lower opening portion of the second void portion is further included as the communication portion, and the lower opening portion opens facing a region of the part of the combustion air supply path.

4. The burner apparatus of claim 1 or 2, wherein:

a plurality of bent-sheet-shaped or press-stepped protruding portions that protrude toward the front plate portion and whose front end portions abut against the front plate portion are integrally formed on the damper.

5. The burner apparatus of claim 3, wherein: