JP6871532B2 - Burner device - Google Patents

Description

The present invention relates to a burner device suitable for use as, for example, a component of a gas water heater.

Specific examples of the burner device include those described in Patent Documents 1 and 2.
In the burner device described in these documents, a plurality of burner bodies (gas combustion pipes) are arranged side by side and housed in a burner case. The upper surface of the plurality of burner main bodies is a flame hole surface for burning the fuel gas, and the primary air mixed with the fuel gas is supplied from the fan into the plurality of burner main bodies. In addition, secondary air is also supplied upward from the lower side to the installation areas of the plurality of burner main bodies. This secondary air helps to improve the flame retention in each burner body.

However, in the above-mentioned prior art, there is still room for improvement as described below.

That is, when the secondary air is supplied upward from below to the region where the plurality of burner bodies are arranged side by side, the secondary air is advanced upward at an appropriate flow velocity between the burner bodies. Thereby, it is possible to improve the flame retention property of the burner body. However, among the plurality of burner main bodies, it is difficult to appropriately generate the secondary air flow as described above on the outer side of the endmost burner main body located at the end end of the array. There is. As a result, the flame retention property of the endmost burner body may deteriorate.
As the burner body, for example, there is a light and shade burner type, which generates a light flame inside the flame hole surface and generates a dark flame as an auxiliary flame on both sides thereof to improve the overall flame retention. While improving it, we are trying to _{reduce NO X.} However, even when such a burner main body is used, there is a possibility that the flame retention property of the deep flame may deteriorate with respect to the outermost burner main body. When the flame-retaining property of a strong flame deteriorates, the light flame having a lower flame-retaining property is also affected, and the overall flame-retaining property deteriorates. It is hoped that such a situation will be appropriately resolved.

Jikkenhei 04-25924 Japanese Patent No. 5554027

The present invention has been conceived under the above-mentioned circumstances, and an object of the present invention is to provide a burner device capable of improving flame retention by a simple configuration.

In order to solve the above-mentioned problems, the following technical measures are taken in the present invention.

The burner device provided by the present invention includes a burner case for accommodating a plurality of burner bodies having a flame hole surface on the upper surface in a side-by-side arrangement, and an endmost burner located at the end of the arrangement of the plurality of burner bodies. A side that is arranged between the main body and the side wall portion of the burner case, forms a first gap between the side wall portion, and forms a second gap between the end portion burner main body. A plate portion, an air flow path that enables air discharged from a fan attached to the burner case to be supplied upward from below toward the installation areas of the plurality of burner bodies and the first gap. The side plate portion is capable of allowing a part of the air supplied from the air flow path toward the first gap to flow into the second gap. It is characterized by forming an opening for taking in air.

According to such a configuration, the following effects can be obtained.
That is, a part of the air discharged from the fan, passing through the air flow path, and supplied toward the first gap formed between the side plate portion and the side wall portion of the burner case is for air intake. By passing through the opening, the air flows into the second gap between the end burner main body and the side plate portion. As a result, an upward air flow having an appropriate amount of air and a flow velocity is accurately placed near the outer side (side wall side of the burner case) of the flame generated on the flame hole surface of the outermost burner body. It is possible to cause it. Therefore, it is possible to improve the flame-retaining property of the endmost burner body as compared with the conventional case.
Further, since the air passing through the first and second gaps cools the side plate portion, the effect of preventing the side plate portion from being thermally damaged can also be obtained.
Although there may be air that passes upward through the first gap as it is, such air can be used for cooling the side wall portion of the burner case.

In the present invention, preferably, the upper region of the side plate portion faces substantially parallel to the upper side surface of the end end burner body, and the height of the side plate portion is the end end portion. It is said to be approximately the same as or less than the height of the burner body.

According to such a configuration, it is more preferable to form an air flow having an appropriate amount and a flow velocity on the side above the flame hole surface of the outermost burner main body. In addition, it is possible to more reliably prevent the side plate portion from being thermally damaged by the flame during the drive combustion of the endmost burner main body.

In the present invention, preferably, the air intake guide portion is provided with a first air intake guide portion provided with an air intake guide portion at the upper edge portion, and the air intake guide portion is the upper portion. It is in the shape of a downward or diagonally downward projecting piece protruding from the edge portion toward the side wall portion of the burner case.

According to such a configuration, the presence of the air intake guide portion has an effect of increasing the amount of air flowing from the first gap to the second gap through the first air intake opening. As a result, it is ensured that there is no shortage of air flowing laterally above the second gap and the end burner body.

In the present invention, preferably, the air intake guide portion is inclined so as to approach the side wall portion of the burner case toward the lower side.

According to such a configuration, when the air passing upward through the first gap hits the air intake guide portion, the air is smoothly guided to the second gap. Therefore, in addition to being advantageous in increasing the amount of air inflow from the first gap to the second gap, turbulence of air is prevented from occurring in the second gap as much as possible, and the flame retention property is further improved. It becomes possible.

In the present invention, preferably, the plurality of burner bodies are held in a holder and configured, and the burner case is provided with a burner unit that can be taken out to the outside. A base member having a rectifying plate portion in which the burner main bodies of the above are mounted side by side and having a plurality of ventilation holes forming a part of the air flow path, and the plurality of burners attached to the base member. A frame-shaped member that surrounds at least a part of the periphery of the plurality of burner bodies is provided so as to fix the burner body, and a part of the frame-shaped member is the side plate portion.

According to such a configuration, by moving the burner unit in and out of the burner case, it is possible to collectively incorporate or take out a plurality of burner main bodies in the burner case. Therefore, the assembly workability and maintenance workability of the burner device can be improved. On the other hand, since a part of the frame-shaped member constituting the holder of the burner unit is the side plate portion, the configuration is rational. It is possible to reduce the manufacturing cost by eliminating the need to use a member dedicated to the side plate portion.

In the present invention, preferably, the lower edge portion of the side plate portion is set so as to be arranged above the straightening plate portion, and the side plate portion serves as the air intake opening. A second air intake opening formed so as to open between the lower edge portion and the straightening vane portion is provided.

According to such a configuration, it is possible to increase the amount of air inflow from the first gap to the second gap.

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.

It is a perspective view which shows an example of the burner device which concerns on this invention. It is an exploded perspective view of the burner device shown in FIG. FIG. 3 is a sectional view taken along line III-III of FIG. FIG. 6 is a sectional view taken along line IV-IV of FIG. FIG. 6 is an enlarged cross-sectional view of a main part of FIG. It is an exploded perspective view of the holder which constitutes the burner unit shown in FIG. 2 and the burner main body. It is an exploded perspective view of the holder shown in FIG. It is a side sectional view of the holder shown in FIG. FIG. 8 is an exploded cross-sectional view of FIG. It is sectional drawing of the main part which shows the other example of this invention.

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

The burner device B shown in FIG. 1 is used, for example, as a component of a gas hot water supply device, and a heat exchanger (not shown) through which hot water flows is mounted on the upper side of the burner device B. By driving and burning the burner device B, the hot water fed into the heat exchanger can be heated.

The burner device B includes a burner case 1, a burner unit U housed in the burner case 1, and an auxiliary plate 2 attached to the front surface of the burner case 1.

As is well represented in FIG. 2, the burner case 1 has a substantially rectangular parallelepiped shape having a front opening 10 and a top opening 11. The auxiliary plate 2 is attached to the burner case 1 and the burner unit U by using a plurality of screws 7a and 7b so as to close the upper region of the front opening 10. More specifically, the upper portion of the auxiliary plate 2 utilizes screws 7a, screw insertion holes 70, and screw holes 71 with respect to the upper front wall portion 12 corresponding to the upper edge portion of the front opening 10 of the burner case 1. Is installed. On the other hand, the lower portion of the auxiliary plate 2 is attached to the upper portion of the front wall portion 41 of the burner unit U, which will be described later, by using screws 7b, screw insertion holes 71, and screw holes 72. As shown in FIG. 3, an ignition plug 78 for driving combustion of the burner device B, a frame rod 79 for flame detection, and the like are attached to the auxiliary plate 2. When the auxiliary plate 2 is removed from the burner case 1 and the burner unit U, the burner unit U can be taken in and out of the burner case 1 from the front through the front opening 10.

The burner unit U is assembled to the holder H in a state where a plurality of burner main bodies 3 (gas combustion pipes) are arranged side by side. Each burner main body 3 is the same as the conventionally known one described in, for example, Japanese Patent Application Laid-Open No. 2013-242080, and is a type called a light and shade burner. As is well shown in FIG. 6, each burner main body 3 has a relatively flat shape as a whole, has fuel gas introduction ports 30a and 30b at one end (front end), and has a flame on the upper surface. The hole surface is 31.

The details of the holder H of the burner unit U will be described later, but the burner unit U is housed in the burner case 1 in the state shown in FIGS. 3 and 4. In FIG. 3, a fan 50 and a fuel gas injection head 51 are attached to the lower portion and the front portion of the burner case 1. Of the air supplied from the fan 50 into the burner case 1, the primary air for combustion passes through the lower main air flow path 59 in the burner case 1 and reaches the air supply port 44 described later for combustion. Together with the fuel gas injected from the nozzle of the gas ejection head 51, the fuel gas is introduced into the fuel gas introduction ports 30a and 30b of the burner main body 3. The fuel gas burns on the flame hole surface 31 and above it. Of the air supplied from the fan 50 to the main air flow path 59, air other than the primary air passes upward through a plurality of ventilation holes 40a of the rectifying plate portion 40 described later in the holder H. As a result, secondary air for combustion is supplied to the installation areas of the plurality of burner main bodies 3 (including the second gap 82 described later). Air is also supplied to the first gap 81, which will be described later.
The main air flow path 59 and the plurality of ventilation holes 40a form the "air flow path" referred to in the present invention.

As shown in FIG. 7, the holder H of the burner unit U is configured by combining the base member 4 and the frame-shaped member 6. Both the base member 4 and the frame-shaped member 6 are formed by pressing a metal plate or the like.
The base member 4 includes a straightening vane portion 40 that serves as a bottom wall portion on which a plurality of burner main bodies 3 are mounted, a plurality of leg portions 45 that project downward from the straightening vane portion 40, and a straightening vane portion 40. It includes a front wall portion 41 that rises upward from the front portion. A plurality of air supply ports 44 facing the fuel gas introduction ports 30a and 30b and a plurality of positioning front ends of the plurality of burner main bodies 3 are fitted into the front wall portion 41 for positioning and fixing thereof. A recess 42 is formed. The plurality of legs 45 are portions placed on the bottom wall portion 19 of the burner case 1, whereby the main air flow path 59 described above is between the bottom wall portion 19 and the straightening vane portion 40. Is formed.

The frame-shaped member 6 of the holder H has a substantially U-shape in a plan view in which a rear wall portion 60 for surrounding the rear side and both left and right sides of the plurality of burner main bodies 3 and a pair of left and right side plate portions 61 are connected. At the upper and lower ends of the rear wall portion 60, a plurality of positioning recesses 62a and 62b are provided for fitting the rear end portions of the plurality of burner main bodies 3 and fixing the positioning thereof.

As shown in FIGS. 8 and 9, the pair of side plate portions 61 are attached to the base member 4 using screws 7c. As a means for assisting this attachment and ensuring the fixing of the side plate portion 61, the lower portion of the rear side of the side plate portion 61 is inserted into the engaging slit 46 provided in the base member 4 and is inserted into the engaging slit 46. An engaging convex portion 61a is provided on the front edge portion of the engaging slit 46. An engaging recess 61b that can be engaged with the engaged recess 47 provided in the base member 4 is provided on the front upper portion of the side plate portion 61 (see also the enlarged perspective view of the main part in FIG. 7).

As shown in FIGS. 4 and 5, the pair of side plate portions 61 includes the pair of left and right end burner bodies 3 (3A) located at the ends of these arrangements among the plurality of burner bodies 3. It is located between the left and right side wall portions 18 of the burner case 1. A first gap 81 is formed between the side plate portion 61 and the side wall portion 18, and a second gap 82 is formed between the side plate portion 61 and the endmost burner body 3A. Is formed.

As is well represented in FIG. 5, the side plate portion 61 is further provided with a first air intake opening 91 and a plurality of convex portions 61c. Further, the side plate portion 61 forms a second air intake opening 92.

The plurality of convex portions 61c are small-sized hemispheres that are located above the side plate portion 61 and project in the horizontal direction. By setting these plurality of convex portions 61c to abut on the outer surface portion of the endmost burner body 3A, a second gap 82 is provided between the endmost burner body 3A and the side plate portion 61. Is formed. The width W1 of the second gap 82 is substantially the same as, for example, the width W2 of the upper gap of the other plurality of burner main bodies 3. However, it is not limited to this.

The first air intake opening 91 has a through-hole shape provided in a region near the upper part of the side plate portion 61, and has a substantially rectangular shape extending in the front-rear direction (see also FIGS. 8 and 9). However, an air intake guide portion 93 is continuously provided at the upper edge portion of the first air intake opening 91. The air intake guide portion 93 has an obliquely downward projecting shape protruding from the upper edge portion toward the side wall portion 18, and is preferably inclined so as to approach the side wall portion 18 toward the lower side as shown in FIG. doing. The air intake guide portion 93 can be formed by subjecting the side plate portion 61 to a drawing process, a cutting process, or the like. According to the drawing process, the closed wall portions 93a (see FIGS. 8 and 9) are formed at both ends of the air intake guide portion 93 in the longitudinal direction (front-rear direction of the side plate portion 61), and the air intake guide portion 93 is formed. It is possible to prevent the inner regions of both ends in the longitudinal direction from opening in the anteroposterior direction. This is advantageous in increasing the amount of air flowing into the second gap 82 from the first gap 81 through the first air intake opening 91.

The second air intake opening 92 is set so that the lower edge portion 61d of the side plate portion 61 is formed in a notch shape, and the lower edge portion 61d is arranged so as to be separated above the straightening plate portion 40. It is formed by doing. That is, the opening between the lower edge portion 61d and the straightening vane portion 40 is the second air intake opening 92.

The upper region of the side plate portion 61 faces substantially parallel to the upper side surface of the endmost burner main body 3A. Further, the height h1 of the side plate portion 61 is preferably substantially the same as the height h2 of the endmost burner main body 3A, or slightly lower than the height h2. However, the present invention is not limited to this.

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

First, in the state where the fan 50 is driven, when each burner main body 3 is driven for combustion, a part of the combustion air supplied from the fan 50 to the main air flow path 59 is a plurality of ventilation holes 40a. Is supplied as secondary air to the installation areas (including the second gap 82) of the plurality of burner main bodies 3. At that time, air is also supplied to the first gap 81. A part of the air supplied to the first gap 81 rises as it is along the side wall portion 18 of the burner case 1, which serves to cool the side wall portion 18 and prevent thermal damage. As a means for more reliably preventing thermal damage to the side wall portion 18, a heat shield plate that approaches the side wall portion 18 via an air layer may be further provided.

On the other hand, the other part of the air supplied to the first gap 81 passes through the first air intake opening 91 and flows into the second gap 82. In this case, the air intake guide unit 93 plays a role of promoting the inflow of air from the first gap 81 to the second gap 82. For this reason, the amount of air flowing upward through the second gap 82 is increased, and an appropriate volume and flow velocity are provided near the outer side of the flame generated on the flame hole surface 31 of the outermost burner main body 3A. It is possible to continuously generate an upward air flow AF (schematically illustrated with an arrow) having a. As a result, the flame retention property can be improved without insufficient supply of secondary air to the flame forming region of the endmost burner main body 3A.

The second air intake opening 92 serves to allow a part of the air that has passed through the ventilation hole 40a and heads for the first gap 81 to flow into the second gap 82. This makes it possible to increase the amount of air flowing into the second gap 82 and further ensure that the flame retention property is improved.

As described above, the upper region of the side plate portion 61 faces the upper side surface of the endmost burner main body 3A substantially parallel to the upper side surface at an appropriate interval (width W1). Further, the height h1 of the side plate portion 61 is substantially the same as or slightly lower than the height h2 of the endmost burner main body 3A. Therefore, the above-mentioned air flow AF is more preferable in improving the flame retention property of the endmost burner main body 3A. Unlike the present embodiment, when h1> h2, the side plate portion 61 may be heated to a high temperature and may be thermally damaged. On the other hand, according to the present embodiment, it is possible to appropriately eliminate such a risk.

In the present embodiment, the burner unit U in which a plurality of burner main bodies 3 are held by the holder H is provided, and the burner unit U has a front opening 10 in a state where the auxiliary plate 2 is removed from the burner case 1. It can be taken in and out of the burner case 1 via. Therefore, maintenance work of the burner main body 3 is also easy. On the other hand, the means for improving the flame holding property of the endmost burner main body 3A is configured by using the side plate portion 61 constituting the holder H of the burner unit U. Therefore, the configuration is rational, and since a special member for improving the flame retention property is not separately used, it is possible to reduce the manufacturing cost.

FIG. 10 shows another embodiment of the present invention.
In the figure, the shape of the air intake guide portion 93A is different from that of the above-described embodiment, and the portion of the air intake guide portion 93A near the lower end extends downward without being inclined. However, the air intake guide portion 93A projects closer to the side wall portion 18 than the other general portions of the side plate portion 61 in the horizontal direction. Therefore, the air intake guide portion 93A of the present embodiment also efficiently guides the air traveling upward through the first gap 81 to the first air intake opening 91, and the air flows into the second gap 82. It plays a role in increasing the amount.
As understood from the present embodiment, the specific shape of the air intake opening can be changed in various ways.

The present invention is not limited to the contents of the above-described embodiments. The specific configuration of each part of the burner device according to the present invention can be variously redesigned within the scope intended by the present invention.

In the above-described embodiment, a burner unit in which a plurality of burner bodies are held by holders is configured, and the burner unit can be taken in and out of the burner case, but the present invention may have a different configuration. it can. For example, Patent Document 2 discloses a configuration in which a plurality of burner bodies are individually incorporated in a burner case, but such a configuration can also be adopted. In this case, the plate material located outside the outermost burner body may be used as the side plate portion according to the present invention to form an air intake opening.

The air intake opening may have a specific shape as long as it can allow a part of the air supplied from the air flow path toward the first gap to flow into the second gap. The size and number are not limited. An air intake guide portion may not be provided at the upper edge of the air intake opening.

The burner body does not necessarily have to be configured as a light and shade burner, and a different type (for example, all primary burners) can be used.
The burner device according to the present invention is not limited to the hot water supply device, and its specific use is not limited to, for example, a hot air device or an incinerator.

B Burner device H Holder U Burner unit 1 Burner case 2 Auxiliary plate 3 Burner body 3A Endmost part Burner body 4 Base member 40 Rectifying plate part 6 Frame-shaped member 61 Side plate part 61d Lower edge part (of side plate part)
81, 82 First and second gaps 91,92 First and second air intake openings (air intake openings)
93,93A Air intake guide

Claims (6)

A burner case that houses a plurality of burner bodies whose upper surface is a flame hole surface in a side-by-side arrangement,
It is arranged between the endmost burner body located at the end of the array of the plurality of burner bodies and the side wall portion of the burner case, and forms a first gap between the side wall portion and the above. A side plate portion that forms a second gap with the endmost burner body, and
An air flow path that enables air discharged from a fan attached to the burner case to be supplied upward from below toward the installation areas of the plurality of burner bodies and the first gap.
It is a burner device equipped with
The side plate portion forms an air intake opening capable of allowing a part of the air supplied from the air flow path toward the first gap to flow into the second gap. A burner device that features that. The burner device according to claim 1.
The upper region of the side plate portion faces substantially parallel to the upper side surface of the end burner body, and the height of the side plate portion is substantially the same as the height of the end burner body. A burner device that is said to be, or less. The burner device according to claim 1 or 2.
As the air intake opening, a first air intake opening having an air intake guide portion provided on the upper edge portion is provided.
The air intake guide portion is a burner device having a downward or diagonally downward projecting shape protruding from the upper edge portion toward the side wall portion of the burner case. The burner device according to claim 3.
A burner device in which the air intake guide portion is inclined so as to approach the side wall portion of the burner case toward the lower side. The burner device according to any one of claims 1 to 4.
The plurality of burner bodies are held in a holder and configured, and the burner case is provided with a burner unit that can be taken out to the outside.
The holder is a base member having a rectifying plate portion in which the plurality of burner main bodies are mounted side by side and a plurality of ventilation holes forming a part of the air flow path are provided, and the base member. It is provided with a frame-shaped member that is attached and surrounds at least a part of the periphery of the plurality of burner bodies so as to fix the plurality of burner bodies.
A burner device in which a part of the frame-shaped member is the side plate portion. The burner device according to claim 5.
The lower edge portion of the side plate portion is set so as to be arranged above the straightening plate portion.
A burner device including, as the air intake opening, a second air intake opening formed so as to open between the lower edge portion of the side plate portion and the straightening plate portion. ..

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