JP2005282919A - Water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce variation in height dimension of a connecting body of a heat exchanging part 4A and an exhaust duct part 56 in a water heater wherein a gas combustion chamber 3A, the heat exchanging part 4A and the exhaust duct part 56 are successively arranged in this order from a lower part in a casing 9. <P>SOLUTION: A set of a right side wall for heat exchange 45 and a right side wall for duct 57, a set of a left side wall for heat exchange 46 and a left side wall for duct 58, and a set of a rear side wall for heat exchange 48 and a rear side wall for duct 542 constituting the heat exchanging part 4A and the exhaust duct part 56 are respectively composed of a sheet of plate. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a water heater that improves the accuracy of the height dimension of an assembly of a heat exchange section and an exhaust duct section.

FIG. 5 is an exploded perspective view of the internal structure of a conventional water heater.
A burner block (2) composed of a plurality of flat burners (21) (21) arranged in parallel is housed in a rectangular combustion box (3) and a front end opening of the combustion box (3) ( The upper half of 30) is closed by a front plate (32), and further, gas is supplied from the gas distributor (1) to the burner block (2).

On the other hand, the heat exchanger (4) connected to the upper end opening (31) of the combustion box (3) includes a rectangular cylindrical outer frame (40) penetrating vertically, and the outer frame (40). A large number of heat-absorbing fins (41) and (41), and heat-absorbing fins (41) and (41) and water flow pipes (42) and (42) penetrating the side walls of the outer frame (40) are formed.
The exhaust duct body (5) connected to the upper end opening (43) of the heat exchanger (4) is formed in a flat rectangular box shape that opens downward and forward, as shown in FIG. A packing (50) is interposed between the outer peripheral flange (53) of the lower end opening (52) of the exhaust duct body (5) and the outer peripheral flange (44) of the upper end of the heat exchanger (4). . In this state, the outer peripheral flanges (53) and (44) are joined by caulking, screws or the like. Further, an exhaust port cover (6) is connected to the exhaust port (51) at the downstream end of the exhaust duct body (5), and the exhaust port cover (6) is connected to the exhaust pipe (60) that penetrates forward and backward. It has. A mounting flange (61) provided around the rear end of the exhaust pipe (60) is fixed to the outer peripheral flange (511) at the tip of the exhaust duct body (5) with screws (b) and (b). At the same time, the exhaust pipe (60) is loosely inserted into an exhaust window (91) provided in the front cover (90) of the casing (9) of the water heater.
Japanese Patent Laying-Open No. 2003-21319 (FIG. 1)

  However, since the heat exchanger (4) and the exhaust duct body (5) are composed of independent parts in the above conventional one, the dimensional variation during assembly is likely to occur. The accuracy of the height dimension of the combined body with the duct body (5) is deteriorated. In addition, since the packing (50) is interposed in the connecting portion between the heat exchanger (4) and the exhaust duct body (5), the dimensional variation during assembly also occurs from this point, and the heat exchanger (4 ) And the exhaust duct body (5), the accuracy of the height dimension of the combined body is deteriorated. Then, as a result of superimposing variations in the above dimensions, the system of the height dimension of the combined body becomes worse, and, for example, an exhaust port cover with respect to the exhaust window (91) of the casing (9), for example. The exhaust pipe (60) of (6) is easily displaced up and down. As a result, there has been a problem in that when the product is assembled, the exhaust pipe (60) of the exhaust port cover (6) and the exhaust window (91) of the casing (9) cannot be smoothly fitted.

The present invention has been made in view of such points.
`` A water heater in which a gas combustion chamber, a heat exchange part, and an exhaust duct part are arranged in this order from below in the casing (9),
The heat exchanging unit includes a plurality of heat-absorbing fins (41) disposed in a rectangular space surrounded by four side walls including a right side wall for heat exchange, a left side wall for heat exchange, a front side wall for heat exchange, and a rear side wall for heat exchange. ) (41) and water absorption pipes (42) (42) penetrating the heat sink fins (41) (41),
The exhaust duct portion includes a right side wall for duct and a left side wall for duct and a rear side wall for duct, which are extended upward from each of the right side wall for heat exchange and the left side wall for heat exchange and the rear side wall for heat exchange. Further, in a water heater provided with an exhaust passage opened downward and forward surrounded by four walls with a duct ceiling wall, the height dimension variation of the combined body of the heat exchanging portion and the exhaust duct portion is reduced. By reducing the size, for example, the relative position between the exhaust window (91) provided in the casing (9) and the exhaust pipe (60) is prevented from being greatly displaced in the vertical direction. It is an object of the present invention to make it possible to smoothly perform the operation of fitting the cylinder (60) and the exhaust window (91).

[Invention of Claim 1]
The technical means of the invention according to claim 1 for solving the above-mentioned problem is as follows:
“A set of the right side wall for heat exchange and the right side wall for duct, a set of the left side wall for heat exchange and the left side wall for duct, a set of the rear side wall for heat exchange and the rear side wall for duct, Each is composed of a single board.
According to the above technical means, among the constituent walls of the heat exchange part and the exhaust duct part, each of the constituent walls connected in the vertical direction is constituted by a single plate. Therefore, unlike the above-described conventional one in which the heat exchanging part divided into the upper and lower parts and the exhaust duct part are combined, the overall height dimension of the combined body of the heat exchanging part and the exhaust duct part may vary due to an assembly error or the like. Less.

[Invention of Claim 2]
In the invention according to claim 1,
“Each of the single plates and the front wall for heat exchange are all made of the same material”.
If each single plate and the front wall for heat exchange are made of different materials with different thermal expansion coefficients, each single plate and the joint between this and the front wall for heat exchange are heated by gas combustion In some cases, each of the single plates and the front wall for heat exchange perform different amounts of thermal expansion in the vertical direction. As a result, a large thermal stress acts on the joints such as the single plates, and the joints are easily damaged over time. On the other hand, in the invention according to the second aspect, each single plate and the front side wall for heat exchange are all made of the same material having the same coefficient of thermal expansion. Thermal expansion occurs, so that no thermal stress acts on the joint.
Therefore, there is less concern that the connecting portion will be damaged over time.

[Invention of Claim 3]
In the invention according to claim 1 or 2,
“A set of the right side wall for heat exchange and the right side wall for the duct, a set of the left side wall for heat exchange and the left side wall for the duct, each of the single plates made of a stainless material,
The water pipes (42) and (42) pass through the right side wall for heat exchange and the left side wall for heat exchange, and the water pipes (42) (42) and the heat absorbing fins (41) (41). Is made of copper material,
The through portions of the water pipes (42) and (42) with respect to the heat absorbing fins (41) and (41) are brazed. "
In this case, since the left and right single plates constituting the right side wall for heat exchange and the left side wall for heat exchange are made of a stainless material, the mechanical strength is improved as compared with the case of a copper material. Therefore, there is less concern that the heat exchange unit or the like is damaged due to an impact during shipping and transportation of the water heater or installation work. Moreover, since the said single plate is comprised with the stainless steel material, heat resistance improves compared with a copper material, and aged deterioration can be suppressed.

Further, in the invention according to claim 3, since the through portions of the water pipes (42) (42) with respect to the respective single plates constituting the right side wall for heat exchange and the left side wall for heat exchange are not substantially fixed, Even if the water pipes (42) and (42) repeat thermal expansion and contraction in the length direction, thermal stress does not act on the penetrating portion, and there is less fear that the heat exchanging portion is damaged.
That is, the heat absorption fins (41) (41) and the water pipes (42) (42) made of copper material are brazed to each other, but these heat absorption fins (41) (41) and the water pipe (42) (42) is generally brazed in a heating furnace as follows.

That is, the water absorption pipes (42) and (42) are passed through the group of heat absorption fins (41) and (41), and the outer peripheral surfaces of the water flow pipes (42) and (42) and the heat absorption fins (41) and (41) in the penetration part. ), A brazing material is interposed as appropriate. Moreover, the both ends of the water pipes (42) and (42) are passed through the left and right single plates (made of stainless steel) constituting the right side wall for heat exchange and the left side wall for heat exchange. An assembly of a pair of single plates, water pipes (42) and (42), and heat absorbing fins (41) and (41) is heated in a heating furnace to melt the brazing material. By melting the brazing material, the heat absorption fins (41) (41) and the water pipes (42) (42) are brazed, but the left and right single plates are made of stainless steel. Even if the brazing material flows into the through portions of the water pipes (42) and (42), the one plate and the water pipes (42) and (42) are not substantially brazed. Since the brazing material combines the heat-absorbing fins (41) (41) made of copper and the water pipes (42) (42), the left and right stainless steel plates and the water pipes (42) (42) are connected. This is because they are not substantially combined.
Therefore, when the water pipe (42) (42) repeats thermal expansion and contraction in the length direction along with gas combustion / extinguishment, the water pipe (42) (42) is the one piece in the penetrating portion. By sliding with respect to the plate, an excessive force does not act on the penetrating portion. Therefore, damage to the heat exchange part can be prevented.

[Invention of Claim 4]
In the invention according to claims 1 to 3,
“A set of the right side wall for heat exchange and the right side wall for duct, a set of the left side wall for heat exchange and the left side wall for duct, a set of the rear side wall for heat exchange and the rear side wall for duct `` The boundary portions in the circumferential direction between the single plates constituting each of them are coupled by caulking '', the coupling portions between the single plates are coupled by caulking with high airtightness. No special packing is required to ensure the airtightness of the parts, and the number of parts can be reduced accordingly.

[Invention of Claim 5]
In the invention according to claims 1 to 4,
“The duct ceiling wall of the exhaust duct portion may be formed by extending the single plate constituting the set of the rear wall for heat exchange and the rear wall for duct”.
In this case, the duct ceiling wall, the duct rear side wall, and the heat exchange rear side wall are formed of a single plate, so that the duct ceiling wall and the duct rear wall can be simply formed by bending the single plate. A side wall can be constituted, and a special operation for connecting the ceiling wall for duct and the rear side wall for duct is not necessary.

[Invention of Claim 6]
In the invention according to claims 1 to 5,
“The front wall for heat exchange is a set of the right side wall for heat exchange and the right side wall for duct, and a single plate constituting each set of the left side wall for heat exchange and the left side wall for duct. In the case of “attached detachably with screws”, when the screws are removed, the front wall for heat exchange can be removed, and thereby the maintenance inside the heat exchanging portion can be easily performed.

[Invention of Claim 7]
In the invention according to claims 1 to 6,
“The exhaust port cover (6) connected to the front of the exhaust port (51), which is the downstream end of the exhaust duct of the exhaust duct part, and the front wall for heat exchange are configured by a single plate, The exhaust tube (60) projecting forward from the exhaust port cover (6) is formed by drawing the plate, '' the exhaust tube (60) is drawn by drawing the single plate. Since it is formed, it is not necessary to manufacture the exhaust port cover (6) independent of the front wall for heat exchange, the number of parts can be reduced, and parts management can be simplified.

[Invention of Claim 8]
In the invention according to claims 1 to 7,
“The gas combustion chamber is an open space surrounded by four side walls, that is, the right side wall for the combustion chamber, the left side wall for the combustion chamber, the front side wall for the combustion chamber, and the rear side wall for the combustion chamber, and houses the burner block (2). Yes,
A set of the right side wall for the combustion chamber and the right side wall for heat exchange, a set of the left side wall for combustion and the left side wall for heat exchange, a set of the front side wall for the combustion chamber and the front wall for heat exchange, the combustion chamber If each of the set of the rear wall for heat exchange and the rear wall for heat exchange is composed of a single plate, the constituent walls from the gas combustion chamber to the exhaust duct portion are connected one above the other. The accuracy of the height dimension of the whole water heater main body is increased.

The present invention has the following specific effects.
Among the constituent walls of the heat exchange part and the exhaust duct part, each of the constructions connected to the top and bottom is composed of a single plate, so that the heat exchange part divided into the top and bottom and the exhaust duct part are assembled as described above. In contrast, the overall height dimension of the combined body of the heat exchange part and the exhaust duct is less likely to vary due to assembly errors and the like, and the dimensional accuracy is improved.

  In the invention according to claim 2, since each single plate and the front wall for heat exchange are all made of the same material having the same coefficient of thermal expansion, each single plate and the like have the same ratio as the gas burns and extinguishes. Repeat thermal expansion and contraction. Thereby, since a thermal stress does not act on each one board mutually and the connection part of this and the front side wall for heat exchange, there is little fear that the said connection part will be damaged over time.

  In the invention according to claim 3, since the left and right single plates constituting the right side wall for heat exchange and the left side wall for heat exchange are made of stainless steel material, the mechanical strength is higher than that of the single plate of copper material. improves. Moreover, heat resistance improves compared with the case where it comprises with a copper material, and aged deterioration can be prevented. Further, as described above, since the left and right single plates and the water pipes (42) (42) are substantially in a non-bonded state, the water pipes (42) (42) are accompanied by gas combustion / extinguishing. However, even if thermal expansion and contraction are repeated in the length direction, excessive force does not act on the penetrating portions of the water pipes (42) and (42) with respect to the left and right single plates, thereby preventing damage to the heat exchange portion.

In the invention according to claim 4, since the joint portions between the single plates are joined by caulking with high airtightness, no special packing is required to ensure the airtightness of the joint portions, The number of parts can be reduced.
In the invention according to claim 5, the duct ceiling wall and the duct rear wall can be configured only by bending a single plate, so that the duct ceiling wall and the duct rear wall and the like can be combined. No special work is required.

In the invention which concerns on Claim 6, since the heat exchange front side wall can be removed by removal of a screw, the maintenance inside a heat exchange part can be performed easily.
In the invention according to claim 7, since the exhaust port cover (6) and the front wall for heat exchange are composed of a single plate, it is not necessary to manufacture an independent exhaust port cover (6), and the number of parts is reduced. And parts management can be simplified.
In the invention which concerns on Claim 8, the structural wall from a gas combustion chamber to an exhaust duct part is comprised by the continuous one sheet board, and the precision of the height dimension of the whole water heater main body becomes high.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
As shown in FIG. 1 and FIG. 2, the water heater according to the present embodiment includes a gas combustion chamber (3A), a heat exchange section (4A) as an arrangement section of the heat exchanger (4) thereabove, The exhaust duct portion (56) formed between the rectifying blade (55) horizontally disposed above the heat exchanger (4) and the duct ceiling wall (54) thereabove is arranged in this order from below. It has the structure provided in.

Details of each part will be described below.
[Gas combustion chamber (3A)]
The gas combustion chamber (3A) is an arrangement part of the burner block (2), the combustion chamber right side wall (33) and the combustion chamber left side wall (34), the combustion chamber front side wall (35) and the combustion chamber. It is formed in a rectangular box shape that is open upward and surrounded by a rear wall (36) for use and a bottom wall (37) for combustion chamber. As shown in FIGS. 1 and 3, both side edges (371) and (371) of the portion from the combustion chamber bottom wall (37) to the combustion chamber rear side wall (36) are the left and right side walls for the combustion chamber. (34) (33) The lower side (340) (330) to the rear side (341) (331) are fixed to the caulking part (372) (see FIG. 3). In this embodiment, the combustion chamber bottom wall (37), the combustion chamber rear side wall (36), and the combustion chamber left and right side walls (34) (33) are formed of an aluminum-plated steel plate.
The discharge port of the supply fan (F) is connected to the supply port (370) opened in the bottom wall (37) for the combustion chamber.

The burner block (2) disposed in the gas combustion chamber (3A) includes a flat burner (21) (21) group arranged side by side in the left-right direction, and a burner that houses the flat burner (21) (21) group. Composed of the case (20), the left and right side walls (34) and (33) for the combustion chamber, the lower part of the front side wall (35) for the combustion chamber, which will be described later, and the tip standing piece (373) of the bottom wall (37) for the combustion chamber The gas distributor (1) for supplying gas to the flat burners (21) (21) is fixed with screws (19) (19).
The left and right ends of the combustion chamber front side wall (35) are detachably attached to the combustion chamber right side wall (33) and the combustion chamber left side wall (34) with screws (28) (28). It has become. The combustion chamber front side wall (35) has an ignition device (39) for igniting the burner block (2) and a flame for detecting the flame generated in the flat burners (21) (21) group. A detector (38) and an ignition confirmation window (29) are provided.

[Heat exchange part (4A)]
The heat exchange part (4A) is an arrangement part of the heat exchanger (4), and as shown in FIGS. 1 to 3, the heat exchanger (4) has a right side wall (45 ) And the left side wall for heat exchange (46), the front side wall for heat exchange (47) and the rear side wall for heat exchange (48) facing in the front-rear direction, and each of these side walls (45) to the rear side wall for heat exchange (48 ) And a plurality of heat-absorbing fins (41) (41) arranged in parallel in a rectangular space, and further, water pipes (42) (42) penetrating the heat-absorbing fins (41) (41). It has. Further, both ends of the water pipes (42) and (42) penetrate the heat exchange right side wall (45) and the heat exchange left side wall (46) outwardly, and the U-shaped pipes outside the penetrating outside. (42A).

The right side wall for heat exchange (45), the left side wall for heat exchange (46), the front side wall for heat exchange (47) and the rear side wall for heat exchange (48) are made of stainless steel, 41) (41), water pipes (42) (42) and U-shaped pipes (42A) (42A) are made of copper material, and endothermic fins (41) (41) and water pipes (42) (42) The U-shaped tubes (42A) and (42A) are brazed with a brazing material made of a phosphor copper material.
Further, as shown in FIG. 2, the lower side of the heat exchange front side wall (47) and the upper side of the combustion chamber front side wall (35) are joined together by a highly airtight goat fold caulking part (350), This eliminates the need for packing for ensuring airtightness at the joint.
In the present embodiment, the combustion chamber front side wall (35) is formed of an aluminized steel plate.

Next, manufacturing work of the heat exchanger (4) will be described.
As shown in FIG. 4, the water pipes (42) and (42) are passed through the through holes (410) and (410) of the heat sink fins (41) and (41), and the water pipes (42) (42) ( 42) and a linear brazing material (100) (100) are interposed between the inner peripheries of the through holes (410) and (410). Also, the right side wall for heat exchange (45) (consisting of a right side wall for duct (57) described later and a single plate) and the left side wall for heat exchange (46) (the left side wall for duct (58) described later) And both ends of the water pipes (42) and (42) are passed through, and the outer ends of the adjacent water pipes (42) and (42) are connected to the U-shaped pipes (42A) (42A ), And in this state, a single plate constituting the right side wall for heat exchange (45) and the right side wall for duct (57), the left side wall for heat exchange (46) and the left side wall for duct (58), and The assembly such as the water pipes (42) and (42) and the heat absorbing fins (41) and (41) is supported by the jig (18). Then, this assembly is heated in a heating furnace to melt the brazing materials (100) (100). Then, the endothermic fins (41) (41) and the water pipes (42) (42) are brazed by the melting of the brazing material (100) (100), but the right side wall (45) for heat exchange or the heat exchange. Since the left side wall (46) is made of stainless steel, the brazing material melted in the penetration portion of the water pipes (42) and (42) with respect to the right side wall for heat exchange (45) and the left side wall for heat exchange (46). Even if (19) may flow, the right side wall (45) for heat exchange, the left side wall for heat exchange (46), and the water pipes (42) (42) are not substantially brazed. . Accordingly, when the water pipe (42) (42) repeats thermal expansion and contraction in the length direction along with the point / fire extinguishing of the burner block (2) described later, the water pipe (42) (42) ( 42) slides with respect to the left and right side walls (46) and (45) for heat exchange, so that a mechanical load does not act on the penetrating portion. Therefore, it is possible to prevent damage to the heat exchange part (4A).

[Exhaust duct part (56)]
The exhaust duct section (56) provided above the heat exchange section (4A) includes a duct right side wall (57) and a duct left side wall (58), a duct rear side wall (542), and a duct. The right wall for duct (57) is the right wall for heat exchange (45) and the left wall for duct (58) is the left wall for heat exchange (46). Each of them is composed of a single plate made of a stainless material. Further, the duct rear side wall (542), the duct ceiling wall (54) and the heat exchange rear side wall (48) are also manufactured by bending a single plate made of a stainless material into an L shape.

  Further, as shown in FIG. 3, the lower side of the single plate constituting the right side wall for heat exchange (45) and the right side wall for duct (57) is a gore-folded caulking portion with respect to the right side wall for combustion chamber (33). (450) (see FIG. 3) are connected and fixed in an airtight state, and both sides of the single plate constituting the range from the heat exchange rear side wall (48) to the duct ceiling wall (54) For each of the single plate constituting the right side wall for heat exchange (45) and the right side wall for duct (57) and the single plate constituting the left side wall for heat exchange (46) and the left side wall for duct (58) The caulking part (541) is connected and fixed.

Between the top and bottom of the duct ceiling wall (54) and the heat exchanger (4), rectifying blades (55) are horizontally provided. As shown in FIGS. 2 and 3, the duct ceiling wall (54) The exhaust passage (59) is formed between the inner surface of the portion connected to the duct rear side wall (542) and the rectifying blade (55).
As shown in FIG. 2, the range from the duct ceiling wall (54) to the arcuate rear end (540) is formed in a forward inclined posture toward the downstream end (front end) of the exhaust passage (59). In addition, the range from the upper surface to the rear surface of the rectifying blade (55) is parallel to the range from the duct ceiling wall (54) to the arcuate rear end (540). As shown in FIG. 1, the rectifying blade (55) has both side surfaces (560) and (560) fixed to the right and left side walls (58) and (57) for the duct with screws (b) and (b). ing.
Further, as shown in FIG. 2, the lower side of the heat exchange rear side wall (48) and the upper side of the combustion chamber rear side wall (36) are joined together by a goose fold caulking portion (480).

[Exhaust port cover (6)]
The exhaust port cover (6) connected to the exhaust port (51) at the downstream end of the exhaust duct part (56) is composed of a front plate (47) for heat exchange and a single plate. An exhaust pipe (60) penetrating forward and backward is formed by drawing the upper part of the plate forward. The front end of the exhaust pipe (60) is loosely inserted into an exhaust window (91) opened in the front cover (90) of the casing (9), and the front cover (90) is inserted into the casing (9). ) Is detachably attached with screws (95) (95).

  Also, the peripheral edge of the single plate constituting the exhaust port cover (6) and the front wall for heat exchange (47) is screwed to the right side wall for heat exchange (45) and the right side wall for duct (57 ), A single plate constituting the left side wall for heat exchange (46) and the left side wall for duct (58), and a standing upright piece (543) of the ceiling wall for duct (54) It is fixed in a removable state. Therefore, by removing the screws (470) and (470) to remove the single plate constituting the front wall (47) for heat exchange, the maintenance inside the heat exchanger (4) can be easily performed.

  In this, the independent exhaust port cover (6) is formed by forming the exhaust pipe (60) by drawing the single plate constituting the front wall (47) for heat exchange and the exhaust port cover (6). The production of is made unnecessary. Therefore, the number of parts can be reduced, and the parts management can be simplified.

[Actual use]
In this case, when the hot water supply operation is started by burning the burner block (2), the combustion exhaust from the burner block (2) passes through the heat exchanger (4) and the bottom surface of the rectifying blade (55) is inclined ( 550), the gap between the rear end of the rectifying blade (55) and the arcuate rear end (540) of the ceiling wall (54) for the duct → the exhaust passage (59) → the exhaust port (51) → the exhaust port cover It flows in the route of (6) and is released into the atmosphere.
On the other hand, the heated water flowing through the water pipes (42) and (42) is heated and heated by the combustion exhaust gas passing through the heat exchanger (4) and then supplied to a hot water supply place (not shown).

  In this, among the constituent walls of the heat exchange part (4A) and the exhaust duct part (56), the right side wall for heat exchange (45) and the right side wall for duct (57) connected to the top and bottom, and the left side wall for heat exchange ( 46) and the left side wall for duct (58), and the heat exchange rear side wall (48) and the duct rear side wall (542) are each formed of a single plate. Therefore, unlike the conventional one that assembles the heat exchange part (4A) and the exhaust duct part (56) divided into upper and lower parts, the upper and lower parts of the whole assembly of the heat exchange part (4A) and the exhaust duct part (56) It is possible to reduce inconvenience that the dimensions vary due to an assembly error or the like. Therefore, the exhaust pipe (60) of the exhaust port cover (6) and the exhaust window (91) opened in the front cover (90) of the casing (9) are less likely to be displaced in the vertical direction. The operation of fitting the window (91) to the exhaust pipe (60) can be performed smoothly.

  Further, in the water heater according to the above embodiment, the single plate constituting the heat exchange front side wall (47) and the exhaust port cover (6), the heat exchange right side wall (45), and the duct right side wall (57) The single plate that constitutes the left side wall for heat exchange (46) and the left side wall for duct (58), the range from the rear side wall for heat exchange (48) to the ceiling wall for duct (54) Since the single plates that are formed are all made of the same stainless steel material, they all expand and contract at the same coefficient of thermal expansion even if they are heated and heated during hot water supply. Therefore, unlike the case where each of these single plates is made of a different material having a different coefficient of thermal expansion, the arrangement portion of these screws (470) (470) as the connecting portion, and the caulking portion (541) Therefore, there is less concern that these joints will be damaged over time.

[Other]
1. In the above embodiment, a single plate constituting the combustion chamber rear side wall (36) and the combustion chamber bottom wall (37), the combustion chamber right side wall (33), the combustion chamber left side wall (34), and the combustion The room front side wall (35) was made of an aluminized steel plate. In contrast, the combustion chamber rear side wall (36), the combustion chamber bottom wall (37), the heat exchange rear side wall (48), the duct ceiling wall (54), the combustion chamber right side wall (33), Set of right side wall for heat exchange (45) and right side wall for duct (57), left side wall for combustion chamber (34), left side wall for heat exchange (46) and left side wall for duct (58), for combustion chamber Each set of the set of the front side wall (35), the heat exchange front side wall (47), and the exhaust port cover (6) may be formed of a single plate made of stainless steel.
If it does in this way, the constituent wall from a gas combustion chamber (3A) to an exhaust duct part (56) will be comprised by the continuous one sheet board, and the accuracy of the height dimension of the whole hot-water supply body will become high.

2. In the above embodiment, the duct ceiling wall (54) is configured by a single plate common to the heat exchange rear side wall (48) and the duct rear side wall (542), but as in the invention according to claim 8 In addition, the duct ceiling wall (54) may be formed by extending the constituent wall of the exhaust port cover (6). That is, the constituent wall of the exhaust cover (6) is extended upward and the extension is bent backward (in the direction of the rear side wall (542) for the duct), and the rear bent portion is used as the duct ceiling wall (54). It may be adopted.

The exploded perspective view of the internal structure of the water heater which concerns on embodiment of this invention The longitudinal cross-sectional view of the water heater which concerns on embodiment of this invention Partial sectional view of a water heater according to an embodiment of the present invention Sectional drawing explaining the manufacturing method of a heat exchanger (4) An exploded perspective view of an internal structure for explaining a conventional water heater Illustration of conventional example

Explanation of symbols

(2) ・ ・ ・ Burner block
(3A) ・ ・ ・ Gas combustion chamber
(4A) ... Exhaust duct
(6) ... Exhaust port cover
(9) ... Casing
(35) ・ ・ ・ Front side wall for heat exchange
(41) ... Endothermic fin
(42) ... Water pipe
(45) ・ ・ ・ Right wall for heat exchange
(46) ... Left side wall for heat exchange
(48) ・ ・ ・ Back wall for heat exchange
(51) ... Exhaust port
(54) ・ ・ ・ Duct ceiling wall
(56) ... Exhaust duct
(57) ・ ・ ・ Right side wall for duct
(58) ・ ・ ・ Left wall for duct
(59) ... Exhaust passage
(60) ・ ・ ・ Tip tube
(91) ... Exhaust window
(542) ・ ・ ・ Duct rear wall

Claims (8)

A water heater in which a gas combustion chamber, a heat exchange part, and an exhaust duct part are arranged in this order from below in the casing (9),
The heat exchanging unit includes a plurality of heat-absorbing fins (41) disposed in a rectangular space surrounded by four side walls including a right side wall for heat exchange, a left side wall for heat exchange, a front side wall for heat exchange, and a rear side wall for heat exchange. ) (41) and water absorption pipes (42) (42) penetrating the heat sink fins (41) (41),
The exhaust duct portion includes a right side wall for duct and a left side wall for duct and a rear side wall for duct, which are extended upward from each of the right side wall for heat exchange and the left side wall for heat exchange and the rear side wall for heat exchange. Furthermore, in a water heater provided with an exhaust passage opened downward and forward surrounded by four walls with a duct ceiling wall,
Each set of the set of the right side wall for heat exchange and the right side wall for duct, the set of the left side wall for heat exchange and the left side wall for duct, the set of the rear side wall for heat exchange and the rear side wall for duct. Is a water heater that consists of a single plate. In the water heater according to claim 1,
Each of the single plates and the front wall for heat exchange are all made of the same material. In the water heater according to claim 1 or 2,
Each set of one plate constituting the set of the right side wall for heat exchange and the right side wall for duct, the set of the left side wall for heat exchange and the left side wall for duct is made of a stainless material,
The water pipes (42) and (42) pass through the right side wall for heat exchange and the left side wall for heat exchange, and the water pipes (42) (42) and the heat absorbing fins (41) (41). Is made of copper material,
A water heater, wherein the through-holes of the water pipes (42) and (42) with respect to the heat absorption fins (41) and (41) are brazed. In the water heater according to any one of claims 1 to 3,
Each set of the right side wall for heat exchange and the right side wall for duct, the left side wall for heat exchange and the left side wall for duct, and the set of the rear side wall for heat exchange and the rear side wall for duct. The boundary of the circumferential direction of each single board which comprises is couple | bonded by crimping, The water heater. In the water heater according to any one of claims 1 to 4,
The duct ceiling wall of the exhaust duct portion is a water heater in which the single plate constituting the set of the rear wall for heat exchange and the rear wall for duct is extended. In the water heater according to any one of claims 1 to 5,
The front wall for heat exchange is a set of the right side wall for heat exchange and the right side wall for duct, and a single plate constituting each set of the left side wall for heat exchange and the left side wall for duct, A water heater that is detachably attached with screws. In the water heater according to any one of claims 1 to 6,
The exhaust port cover (6) connected forward with respect to the exhaust port (51) which is the downstream end of the exhaust passage of the exhaust duct portion and the front wall for heat exchange are configured as a single plate, and the single sheet A water heater in which an exhaust pipe (60) protruding forward from the exhaust port cover (6) is formed by drawing a plate. In the water heater according to any one of claims 1 to 7,
The gas combustion chamber is an upper open space that is surrounded by four side walls of the combustion chamber right side wall, the combustion chamber left side wall, the combustion chamber front side wall, and the combustion chamber rear side wall and that houses the burner block (2). ,
A set of the right side wall for the combustion chamber and the right side wall for heat exchange, a set of the left side wall for combustion and the left side wall for heat exchange, a set of the front side wall for the combustion chamber and the front wall for heat exchange, the combustion chamber Each set of the rear wall for heating and the rear wall for heat exchange includes a single plate.

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