JP2008107020A - Heat source machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat source machine capable of properly supplying air for combustion to burners respectively received in two casings by one air distribution fan, and being thinned and miniaturized as a whole. <P>SOLUTION: A pair of opening portions 23A, 23B respectively communicating with a pair of spatial portions 21A, 21B of back faces of straightening vanes 6a, 6B, are formed on wall face portions 20A', 20B' opposed to each other, of the pair of casings 2A, 2B receiving the pair of burners 1A, 1B of the heat source machine A, and an air circulating guide 4 comprises an auxiliary portion 44 of a closed cross-sectional structure fully or partially positioned between the pair of casings 2A, 2B, so that the auxiliary portion 44 communicates the pair of opening portions 23A, 23B, thus the insides of the pair of spacial portions 21A, 21B and the auxiliary portion 44 communicate in series. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a heat source device suitable for use in heating and generating hot water such as for hot water supply and heating, more specifically, a plurality of burners such as gas burners, and a single blower fan for each of the plurality of burners. The present invention relates to a heat source device configured to be able to supply combustion air.

  As an example of the heat source apparatus of the hot water supply system, there is one in which two burners are collectively accommodated in one casing and combustion air can be supplied from one blower fan in this casing (for example, a patent) Reference 1). According to such a heat source device, by using two burners, it is possible to individually execute, for example, a hot water heating operation used for general hot water supply and a hot water heating operation used for bath hot water supply. . Moreover, since the number of blower fans is one, the whole structure can be simplified.

  However, when manufacturing a heat source machine including two burners as described above, there are cases where it is desired to have a configuration in which two burners are individually housed in two casings due to various circumstances. Conventionally, as an example of such a heat source device, there is one described in Patent Document 2. The heat source apparatus described in the same document is configured such that two casings for individually accommodating two burners are provided side by side at an appropriate interval, and one blower fan is provided below the two casings. Is provided. Between the blower opening of the blower fan and the bottom of the two casings, there is provided a duct that is partially bifurcated, and combustion air is supplied to the bottoms of the two casings via the duct. It has come to be. In addition, the space part for making combustion air flow in is provided in the bottom part in each casing, and the baffle plate is provided between this space part and a burner.

  Also in the above-described configuration, since the combustion air is supplied from one blower fan to two burners, the overall structure can be simplified. In addition, since the combustion air supplied to the space in each casing is supplied to the burner via the rectifying plate, the combustion air can be supplied substantially uniformly to each part of the combustion region of the burner. it can.

  However, the prior art has still to be improved as described below.

  That is, in the prior art, a duct for supplying combustion air is provided between the two casings that house the burner and the blower fan that is provided therebelow. For this reason, the dimension of the whole heat source apparatus in the vertical height direction is a value obtained by further adding the height dimension of the duct in addition to the height dimension of each of the blower fan and the casing, and the size is likely to be relatively large. On the other hand, in the technical field of this type of heat source machine, there is a demand for reducing the size in the vertical height direction as much as possible to reduce the overall thickness and size. Therefore, in the prior art, there is still room for improvement in promoting reduction in thickness and size of the entire apparatus.

JP-A-8-35626 JP 2001-343167 A

  The present invention has been conceived under the circumstances described above, and appropriately supplies combustion air from one blower fan to the burners individually accommodated in each of the two casings. It is an object of the present invention to provide a heat source machine that can be made thin and downsized as a whole.

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

  The heat source apparatus provided by the present invention includes a pair of casings having side walls that surround each of the pair of burners and arranged side by side with each other, and the pair of casings out of the pair of casings. A pair of space portions formed on the back surface side of the current plate located on the back surface of each burner and the pair of space portions, and the combustion air discharged from the blower fan is connected to the pair of space portions. An air flow guide that guides the air to flow into each of the pair of casings, and of the side walls of the pair of casings, wall surfaces facing each other communicate individually with the pair of space portions. A pair of notched or non-notched openings are formed, and the air flow guide is a supplement of a closed cross-sectional structure in which the whole or a part is located between the pair of casings. And the auxiliary portion communicates between the pair of openings so that the pair of space portions and the inside of the auxiliary portion are formed as a series of air flow paths. It is a feature.

  According to such a configuration, the predetermined pair of space portions formed in the pair of casings communicate with each other via the auxiliary section having a closed cross-sectional structure located between the pair of casings. Therefore, it is not necessary to separately provide a duct having a large thickness on the back side of the casing or the like as a means for communicating the pair of space portions. In the present invention, for example, if combustion air is supplied to any part of the air flow path by connecting a blower fan directly to the rear part of the casing, the combustion air is supplied to each of the pair of burners. Is possible. For this reason, in the present invention, it is possible to appropriately supply the combustion air to the pair of burners while reducing the overall thickness of the heat source device and suitably reducing the overall size.

  In a preferred embodiment of the present invention, an air supply port for allowing combustion air discharged from the blower fan to flow into the air flow path is provided biased toward one side of the pair of casings, The air flow guide has an inclined surface that is inclined so that a cross-sectional area of the air flow path increases as it goes from one side to the other side of the pair of casings.

  According to such a configuration, the supply of combustion air to either one of the pair of burners is appropriately avoided. That is, when the air supply port for the blower fan is provided to be deviated toward one side of the pair of casings, the supply amount of the combustion air into the other casing tends to be reduced. On the other hand, according to the above configuration, since the cross-sectional area of the air flow path increases toward the other casing, the inflow of combustion air to the other casing becomes smooth and accommodated in the other casing. It is possible to increase the amount of combustion air supplied to the burner. The inclined surface of the air flow guide can be formed so as to avoid the location where the blower fan is attached, and the blower fan is bulky with respect to the casing due to the formation of the inclined surface. There are no problems that would result in a disposition.

  In a preferred embodiment of the present invention, the air flow guide is attached to the back side of the pair of casings and closes all or part of the back side openings, and stands up from the cover body. A gate-shaped portion formed in a gate shape, and the auxiliary portion of the closed cross-sectional structure includes a part of the cover body and the gate-shaped portion.

  According to such a structure, the air circulation guide for connecting a pair of space parts is made into the simple structure which combined the predetermined | prescribed cover body and the gate-shaped part which stood up from this cover body. Therefore, the manufacturing is easy and the manufacturing cost can be reduced.

  In a preferred embodiment of the present invention, a flange for contacting an outer surface of the portal portion is formed on each peripheral edge of the pair of openings, and the cover body is included in the portal portion. The outer surfaces of the pair of upstanding portions standing up from the side are inclined so that the distance between them becomes narrower toward the distal end side of the portal portion, and the outer surfaces of the pair of upstanding portions of the flange are in contact with each other. The inner surface portion in contact with each other is an inclined surface inclined in the same direction as the outer surfaces of the pair of upright portions.

  According to such a structure, as a joining structure of the peripheral part of a pair of opening part currently formed in the side wall of a pair of casing, and the portal part of an air circulation guide, the flange of the peripheral part of the said opening part and the said It can be set as the structure which contact | abutted with the outer surface of the portal part, and it can make it difficult to produce a clearance gap between those contact parts. In addition, since the outer surface of the pair of upright portions of the gate-shaped portion and the inner surface portion corresponding to that of the flange are inclined surfaces inclined in the same direction, they are strongly brought into contact with each other. A gap can be made less likely to occur in the portion. For this reason, according to the above-described configuration, the joint portion between the peripheral edge portion of the pair of openings and the gate-shaped portion can have an appropriate joint structure that does not cause undue air leakage.

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

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

  1 to 4 show an embodiment of a heat source machine to which the present invention is applied. 1 and 2, the heat source machine A of this embodiment includes two burners 1A and 1B, two casings 2A and 2B that individually accommodate these, a blower fan 3, and An air circulation guide 4 for guiding combustion air discharged from the blower fan 3 is provided.

  The burners 1A and 1B are gas burners for burning natural gas and other fuel gases, and known ones can be used. Although not shown in the drawing, fuel gas is supplied to the burners 1A and 1B from the outside of the casings 2A and 2B through gas pipes (not shown). Heat exchangers 5A and 5B having heat transfer tubes, for example, are arranged above the burners 1A and 1B, and heat is generated by the heat transfer tubes of the heat exchangers 5A and 5B from the combustion gas generated by the burners 1A and 1B. By collecting, the fluid flowing through the heat transfer tube is heated. For example, the heat exchanger 5A is for heating a fluid such as an antifreeze for floor heating, and the heat exchanger 5B is for heating hot water supplied to, for example, a kitchen or a washroom. belongs to.

  The casings 2A and 2B are both made of metal having heat resistance. These casings 2A and 2B have, for example, side walls 20A and 20B that are substantially rectangular cylinders whose upper and lower portions are open, and surround the burners 1A and 1B. The rectifying plates 6A and 6B are provided below the burners 1A and 1B (on the back side), and space portions 21A and 21B are formed below the rectifying plates 6A and 6B. The rectifying plates 6A and 6B are, for example, provided by arranging a plurality of air circulation holes 60 in a matrix shape on a flat metal plate, and the combustion air flowing into the space portions 21A and 21B is burner 1A, It plays the role of defining the flow of combustion air so as to be distributed and distributed substantially uniformly to each part of the fuel combustion region on the upper surface side of 1B. The space portions 21A and 21B are portions for filling combustion air in the front portions thereof so that the rectifying action of the rectifying plates 6A and 6B is appropriately exhibited.

  The air flow guide 4 includes a cover body 40 for closing the bottom opening portions 25A and 25B of the casings 2A and 2B, and a portal portion 41 attached on the cover body 40. As shown in FIG. 3, the cover body 40 is, for example, a flat shape having a substantially rectangular shape in plan view, and has an air supply port 43 for allowing combustion air discharged from the blower fan 3 to pass therethrough. (In FIG. 3, the internal structure of the casings 2A and 2B is omitted). A flange 42 having a rectangular ring shape in plan view is formed on the outer peripheral edge of the cover body 40. As a means for assembling the air flow guide 4 to the casings 2A and 2B, the upper surface of the flange 42 is brought into contact with the flanges 22A and 22B formed at the bottoms of the casings 2A and 2B, and these portions are made of bolts or the like, for example. A means for fixing using a plurality of screw bodies 90 is employed. As a result, a large gap can be prevented from being formed between the outer peripheral edge of the cover body 40 of the air flow guide 4 and the outer peripheral edge of the bottom of the casing 2A, 2B, and the assembly thereof can be achieved. In addition, as a result of such assembly, the two casings 2A and 2B are connected in a side-by-side state with a predetermined interval therebetween. Preferably, a sealing packing (not shown) made of an elastic member is laminated on the upper surface of the flange 42 or the lower surfaces of the flanges 22A and 22B, and the flanges are joined to each other via the packing. According to such a configuration, the hermetic sealability of the joint portion is enhanced.

  The gate-shaped portion 41 of the air circulation guide 4 is formed by bending a metal plate, for example, and includes a pair of upright portions 410 erected upward from the upper surface of the flange 42 of the cover body 40 and upper portions thereof. And a substantially horizontal upper plate portion 411 to be connected. The pair of upright portions 410 are inclined so that the width between them rises gradually as it goes upward. As clearly shown in FIG. 4, a part of the gate-shaped portion 41 and the cover pair 40 connected to the gate-shaped portion 41 of the air circulation guide 4 constitutes an auxiliary portion 44 having a closed cross-sectional structure. Preferably, a sealing packing 46 (not shown in FIGS. 1 to 3) made of an elastic member is laminated on the outer surface of the portal portion 41.

  As shown in FIGS. 1 to 3, of the side walls 20 </ b> A and 20 </ b> B of the casings 2 </ b> A and 2 </ b> B, the wall portions 20 </ b> A ′ and 20 </ b> B ′ facing each other are formed with notched openings 23 </ b> A and 23 </ b> B opened at the bottom. Has been. These openings 23A and 23B are formed in a shape and size corresponding to the outer surface of the gate-shaped portion 41, and flanges 24A and 24B projecting in a direction in which the casings 2A and 2B face each other are connected to the periphery. It is installed. As clearly shown in FIG. 4, the pair of upright portions 240 corresponding to the upright portions 410 of the gate-shaped portion 41 of the flange 24 </ b> A is inclined so that the width therebetween becomes narrower as it goes upward. ing. Although not shown in the figure, the other flange 24B has the same shape. As shown in FIG. 1, the gate-shaped portion 41 is disposed between the casings 2A and 2B, and the outer surfaces of both ends in the horizontal direction are in contact with the inner surfaces of the flanges 24A and 24B. As a result, the auxiliary portion 44 of the air flow guide 4 communicates between the pair of openings 23A and 23B, and the internal spaces of the space portions 21A and 21B and the auxiliary portion 44 are connected in series in a substantially horizontal manner. It is formed as a flow path P.

  The air supply port 43 is arranged directly under the casing 2B. The blower fan 3 is arranged below the casing 2 </ b> B and the air circulation guide 4 so that the blower port is connected to the air supply port 43. The air flow guide 4 is also formed with an inclined surface 45 a that defines the recess 45. The inclined surface 45a is inclined so that, for example, a portion separated from the air supply port 43 is set as a starting point, and the height thereof is lowered toward the casing 2A side. As a result, in the region of the air flow path P located above the inclined surface 45a, the width in the vertical height direction increases and the cross-sectional area gradually increases as it moves closer to the casing 2A. .

  Next, the operation of the heat source machine A will be described.

  First, when the blower fan 3 is driven to cause combustion air to flow into the space 21B from the air supply port 43, a part of the air passes through the plurality of air circulation holes 60 of the rectifying plate 6B and burns in the burner 1B. To be supplied. On the other hand, the combustion air other than the above passes from the space portion 21B through the inside of the auxiliary portion 44 and proceeds toward the space portion 21A, and then passes through the plurality of air circulation holes 60 of the rectifying plate 6A to burner 1A. To the combustion zone. Since the air supply port 43 is provided so as to directly communicate with the space portion 21B, the amount of combustion air supplied from the space portion 21B toward the burner 1B is determined when no treatment is taken. There is a tendency that the amount of combustion air supplied to the burner 1 </ b> A is reduced and increased. On the other hand, in the present embodiment, the inclined surface 45a is formed in the air flow guide 4, and the cross-sectional area of the air flow path P increases toward the casing 2A. It is possible to prevent the amount of air from being significantly reduced, and to prevent a shortage in the amount of combustion air supplied to the burner 1A. Note that the burner 1B is larger than the burner 1A and consumes more combustion air. When the air supply port 43 is provided so as to be biased toward either one of the burners 1A and 1B, it is preferable to provide the air supply port 43 close to the burner 1B that consumes a large amount of combustion air as in this embodiment.

  In this heat source machine A, the auxiliary portion 44 of the air flow guide 4 that communicates the space portions 21A and 21B is located between the casings 2A and 2B, and the space portions 21A and 21B are interposed via the auxiliary portion 44. They are communicated so that they are arranged almost horizontally. For this reason, it is not necessary to provide the air flow guide 4 in a large and bulky state below the casings 2A and 2B, and the bulk size of the air flow guide 4 can be made very small. Therefore, unlike this embodiment, for example, unlike the configuration in which ducts are separately provided below the casings 2A and 2B, there is almost no need to lower the mounting height of the blower fan 3. As a result, the overall size of the heat source device A in the vertical height direction can be reduced, and the overall thickness and size can be suitably reduced. Although the portion where the inclined surface 45a of the air flow guide 4 is formed protrudes downward from the bottom of the casing 2A, the protruding portion is located on the side of the blower fan 3, and the blower fan 3 is attached. It does not reduce the height. Further, the protruding dimension of the protruding portion may be relatively small. Therefore, the thickness reduction of the heat source machine A is not hindered due to the protruding portion.

  When connecting the auxiliary portion 44 of the air flow guide 4 and the casings 2A, 2B, the outer surface of the portal portion 41 is brought into contact with the flanges 24A, 24B at the peripheral edges of the openings 23A, 23B, and between them. Since the packing 46 is interposed, it is possible to make it difficult for a gap to be formed in these connecting portions. In particular, as described with reference to FIG. 4, the pair of upright portions 410 of the gate-shaped portion 41 and the pair of upright portions 240 of the flanges 24 </ b> A and 24 </ b> B corresponding thereto are narrower as they move upward. Therefore, when the portal portion 41 is pressed upward from below the flanges 24A and 24B, the surfaces in contact with each other can be appropriately pressed against each other. . Therefore, it is possible to more appropriately prevent an inappropriate gap from being generated at the connecting portion between the auxiliary portion 44 and the casings 2A and 2B, and to prevent an inappropriate air leak.

  The present invention is not limited to the embodiment described above. The specific configuration of each part of the heat source machine according to the present invention can be varied in design in various ways.

  The air flow guide referred to in the present invention only needs to include an auxiliary portion having a closed cross-sectional structure that communicates between a predetermined pair of openings formed on the side walls of a pair of casings surrounding two burners. The specific shape and forming method of the auxiliary part and the entire air circulation guide are not limited. The pair of openings formed in the side wall of the casing is not limited to a notched shape having a lower opening, and may be formed in a non-notched hole shape having no lower opening, for example. The shape of the auxiliary portion of the air circulation guide can be variously changed according to the shape of the opening. Further, as a connection means between the peripheral edge portion of the opening and the auxiliary portion of the air flow guide, it is preferable to connect using a flange as in the above embodiment, but for example, welding should be performed on a portion where they contact each other. They may be fixedly connected while maintaining airtightness by attaching them.

  The burner is not limited to a gas burner, and for example, a burner that burns fuel other than gas, such as fuel oil such as kerosene or light oil, can be used. The casing surrounding the burner may have at least a side wall surrounding the periphery of the burner, and its specific size and shape are not limited. The rectifying plate is for appropriately supplying combustion air to the combustion region of the burner, and its specific shape is not limited.

  The heat source device of the above embodiment is combined with a heat exchanger and used as a heat source for a hot water device, but the heat source device according to the present invention is not limited to this, and can be used as a heat source for various applications. is there. Further, in the heat source apparatus according to the present invention, instead of the posture in which the upper surface side of the burner becomes the fuel combustion region, for example, the burner is set to a posture such as sideways or downward, and the combustion gas is advanced horizontally or downward. It can also be in posture. In the present invention, the back surface of the burner means a region opposite to the fuel combustion region of the burner across the burner, and is not limited to the lower region of the burner.

It is a schematic sectional drawing which shows an example of the heat source machine which concerns on this invention. It is a decomposition | disassembly schematic sectional drawing of the heat source machine shown in FIG. FIG. 2 is a partially omitted exploded perspective view of the heat source machine shown in FIG. 1. (A) is IV-IV sectional drawing of FIG. 1, (b) is an exploded sectional view of the part shown by (a).

Explanation of symbols

A heat source machine P air flow path 1A, 1B burner 2A, 2B casing 3 blower fan 4 air flow guide 6A, 6B current plate 20A, 20B side wall (casing)
20A ', 20B' Wall surface (side wall)
21A, 21B Space 22A, 22B Flange (for casing)
40 Cover body 41 Portal part 410 Standing part (of the portal part)
43 Air supply port 45a Inclined surface

Claims (4)

A pair of casings having side walls that surround each of the pair of burners and spaced from each other;
Of the inside of the pair of casings, a pair of space portions formed on the back side of the current plate located on the back of each of the pair of burners;
An air circulation guide that connects the pair of space portions and guides the combustion air discharged from the blower fan to flow into each of the pair of space portions;
A heat source machine comprising:
Of the side walls of the pair of casings, the wall portions facing each other are formed with a pair of notched or non-notched openings that communicate with the pair of space portions individually,
The air flow guide includes an auxiliary part having a closed cross-sectional structure in which the whole or a part is positioned between the pair of casings, and the auxiliary part communicates between the pair of openings. The heat source apparatus, wherein the pair of space portions and the inside of the auxiliary portion are formed as a series of air flow paths. An air supply port for allowing combustion air discharged from the blower fan to flow into the air flow path is provided biased toward one side of the pair of casings,
The heat source machine according to claim 1, wherein the air flow guide has an inclined surface that is inclined so that a cross-sectional area of the air flow path increases from one side of the pair of casings to the other side. The air circulation guide is attached to the back side of the pair of casings and closes the whole or part of the back side opening, and the gate-shaped part formed in a gate shape standing from the cover body And
The heat source apparatus according to claim 1 or 2, wherein the auxiliary portion of the closed cross-sectional structure includes a part of the cover body and the portal portion. A flange for contacting the outer surface of the portal portion is formed on each peripheral edge of the pair of openings,
Out of the gate-shaped portions, the outer surfaces of the pair of standing portions rising from the cover body are inclined so that the distance between them becomes narrower toward the tip side of the portal-shaped portion,
4. The heat source device according to claim 3, wherein an inner surface portion of the flange that contacts an outer surface of the pair of upright portions is an inclined surface inclined in the same direction as the outer surface of the pair of upright portions.

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