JP2001183077A - Boiler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a boiler in which a structure of the boiler is simplified and the number of manufacturing steps of the boiler is reduced. SOLUTION: This boiler is constructed such that flat hollow members 2 for performing a heat exchanging operation for fluid to be heated are formed, and a predetermined number of flat hollow members 2 are arranged in their thickness direction to form a heat exchanging system 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boiler having a novel can body structure.

[0002]

2. Description of the Related Art A boiler, for example, a multi-tube boiler, has a complicated structure because a plurality of water tubes are connected to a header or a drum to form a can as a heat exchanger.
In addition, in such a multi-tube boiler, since a plurality of water pipes are connected to a header and a drum one by one by welding, a large number of welding points are required, which requires a great deal of labor and man-hours. This, in turn, increases the number of man-hours and manufacturing costs of the boiler.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a boiler which can simplify the structure of a boiler can body and reduce the number of manufacturing steps.

[0004]

Means for Solving the Problems The present invention has been made to solve the above problems, and the invention according to claim 1 forms a flat hollow body for exchanging heat of a fluid to be heated. It is characterized in that a heat exchanger is formed by arranging a predetermined number of flat hollow bodies in the thickness direction.

According to a second aspect of the present invention, the inlet of the fluid to be heated and the outlet of the heated fluid or steam after heating in each of the flat hollow bodies are located at substantially the same position in each of the flat hollow bodies. It is characterized by being provided.

According to a third aspect of the present invention, at least one of the flat hollow members has a means for eliminating dead water of a fluid to be heated in the flat hollow member. .

According to a fourth aspect of the present invention, at least one of the flat hollow members has a heat transfer promoting means on a side wall thereof.

The invention according to claim 5 is characterized in that each of the flat hollow bodies has a reinforcing means on a side wall thereof, and the facing reinforcing means of the reinforcing means are in contact with each other.

Further, the invention according to claim 6 is characterized in that at least one of the flat hollow members has a penetrating portion penetrating both side walls thereof.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention can be suitably implemented in a boiler, particularly a hot water boiler or a heat medium boiler. Further, the present invention can be implemented as an evaporator or an exhaust gas boiler of an absorption refrigerator.

[0011] In the boiler according to the present invention, the heat exchanger is formed by arranging a predetermined number of flat hollow bodies for exchanging heat of the fluid to be heated in the thickness direction. Each of the flat hollow bodies is formed as a flat container by joining, for example, plate members, and an appropriate gap is interposed between each of the flat hollow bodies. here,
The boiler may have a structure in which the heat exchanger is housed in a casing, or a structure in which each flat hollow body constituting the heat exchanger is used as a part or the entire casing. it can. For example, when each flat hollow body constituting the heat exchanger is used as a part of the casing, each flat hollow body located on both outer sides of the heat exchanger is used as a part of the casing. Hereinafter, a structure in which the heat exchanger is accommodated in the casing will be described.

Here, when the present invention is embodied as a general boiler having a burner, a burner is provided on one side of the casing and an exhaust gas outlet is provided on the other side, so that the combustion in the casing is achieved. The passage of gas (the combustion gas in this case contains the combustion gas in a flame state and is in a flame state on the upstream side close to the burner) is formed. Further, when the present invention is implemented as an exhaust gas boiler, an exhaust gas inlet is provided on one side of the casing and an exhaust gas outlet is provided on the other side, thereby forming an exhaust gas passage in the casing. Therefore, the heat exchanger is disposed in a gas passage through which the combustion gas and the exhaust gas flow, and the combustion gas and the exhaust gas flow through the gaps between the flat hollow bodies. At this time, a plurality of heat exchangers may be provided in the gas passage from the upstream side to the downstream side.

The boiler is manufactured, for example, as follows. First, a plurality of divided bodies for forming each flat hollow body are manufactured. Each of these divided bodies is a dish-shaped member having a recess formed by, for example, press working. In addition, each of the divided bodies may be a two-part substantially plate-shaped divided body and a frame-shaped divided body sandwiched between them.

Next, the respective flat hollow bodies are manufactured by joining the respective divided bodies. Then, the heat exchanger is manufactured by arranging a predetermined number of the flat hollow bodies and integrally connecting the flat hollow bodies. Alternatively, the heat exchanger can be manufactured by stacking a number of divided bodies corresponding to a predetermined number of flat hollow bodies and then joining them together.

The joining of the divided bodies and the connection of the flat hollow bodies can be performed by welding. However, from the viewpoint of reducing the number of working steps, it is preferable to perform brazing. At the time of brazing, for example, a brazing material is applied or plated in advance to the joints of the divided bodies, and then the divided bodies are assembled, and brazing is performed by heating these joints together with the brazing material. . Further, a brazing material is applied or plated in advance to a connection portion between the flat hollow members, and then the flat hollow members are connected, and the connection portions are heated together with the brazing material to perform brazing. Further, as described above, instead of applying or plating the brazing material, a thin plate member formed of the brazing material may be interposed between the joining portions or between the connecting portions. Here, as the brazing material, a material having high heat resistance such as copper brazing or nickel brazing is used.

As a heating method at the time of the brazing, a brazing method in a furnace for heating the entire heat exchanger after assembling in a heating furnace is performed in order to reduce man-hours and improve workability.
Although preferable in terms of manufacturing cost and the like, brazing can be performed while melting the brazing material as in a torch brazing method.

Each of the flat hollow bodies is manufactured from a divided body formed by press working or the like as described above, and a predetermined number of, for example, one plate-like member is formed in a cylindrical shape, and a joint portion is formed. It can also be manufactured by forming a cylindrical body by brazing and molding the cylindrical body into a flat shape.

As described above, the boiler according to the present invention
Since the number of flat hollow bodies constituting the heat exchanger is significantly smaller than that of a conventional boiler provided with a plurality of water pipes, the structure of the boiler is simplified, and the number of manufacturing steps can be reduced.

In the boiler according to the present invention, the inlet of the fluid to be heated and the outlet of the heated fluid or steam after heating in each of the flat hollow bodies are substantially at the same position as each of the flat hollow bodies. It is provided in. Therefore, the fluid to be heated in each of the flat hollow bodies flows in the same direction in parallel in each of the flat hollow bodies. Therefore, in the heat exchanger, since the heat transfer to the fluid to be heated in each of the flat hollow bodies is made uniform for all the flat hollow bodies, it is possible to prevent a specific flat hollow body from overheating.

Here, it is preferable to provide a means for distributing the fluid to be heated at the inlet of the fluid to be heated into each of the flat hollow bodies. By supplying the heated fluid to each of the flat hollow bodies evenly by the distribution means, the flow rate of the heated fluid in each of the flat hollow bodies can be made uniform. Therefore, in the heat exchanger, the heat transfer to the fluid to be heated in each of the flat hollow bodies is made uniform for all the flat hollow bodies.

[0021] In the boiler according to the present invention, at least one of the flat hollow members may be provided with a dead water area eliminating means for the fluid to be heated. Here, the dead water area eliminating means is means for preventing formation of an area where the fluid to be heated stays in the flat hollow body. By providing such a dead water area eliminating means, it is possible to prevent a decrease in the heat recovery rate due to a short path of the fluid to be heated between the inlet and the outlet of the fluid to be heated.

As the dead water area eliminating means, for example, means for circulating a fluid to be heated can be used. The circulating means is configured to take out a high-temperature heated fluid from the inside of the flat hollow body and supply the heated fluid again to a location where a dead water area is likely to be formed. In addition, as the dead water area eliminating means, a current plate can be provided in the flat hollow body. When the current plate is provided, the current plate is provided so as to branch or deflect the main flow of the fluid to be heated to a location where a dead water area is likely to be formed.

In the boiler according to the present invention, at least one of the flat hollow members may be provided with a heat transfer promoting means. The heat transfer promoting means is provided on the side wall of the flat hollow body, that is, on the heat transfer surface. The heat transfer promoting means may be configured to promote heat transfer by enlarging a heat transfer surface, such as a convex portion, a concave portion, and a heat transfer fin.
That is, it is also possible to adopt a configuration in which heat transfer is promoted by generating turbulence in the combustion gas or exhaust gas flowing in the gaps between the flat hollow bodies. Here, when a convex portion or a concave portion is provided on the heat transfer surface, when the flat hollow body is formed from a plate-like member, it is preferable to form a convex portion or a concave portion in advance on a portion to be the heat transfer surface. .

Further, in the boiler according to the present invention, reinforcing means can be provided on the side wall of each of the flat hollow bodies. The reinforcing means is provided on at least one of the flat hollow bodies. The reinforcing means includes, for example, a convex portion, a concave portion, a projection, a rib, and the like.
That is, the reinforcing means also functions as a heat transfer promoting means for expanding the heat transfer surface.

As described above, when the reinforcing means is provided,
The strength of each flat hollow body is improved, and the pressure resistance of each flat hollow body is improved. Therefore, the thickness of the plate-like member for forming each flat hollow body can be reduced. Here, when the reinforcing means is provided so as to protrude to the outside of each of the flat hollow bodies, if the size and shape are set so that the reinforcing means facing each other in the adjacent flat hollow bodies are in contact with each other, the adjacent flat hollow bodies are adjacent to each other. Since it is possible to prevent the heat transfer surfaces facing each other between the matching flat hollow bodies from being deformed by the pressure from the inside of each flat hollow body, the strength of each flat hollow body is further improved. In the case where the reinforcing means are provided so as to protrude inside the flat hollow bodies, the flat hollow bodies tend to be deformed by pressure from the outside due to negative pressure in the flat hollow bodies and the like. Can be prevented. Further, as described above, when the facing convex portions and the heat transfer fins are configured to be in contact with each other, they can also be used as spacers for maintaining the gaps between the flat hollow bodies.

Further, in the boiler according to the present invention, at least one of the flat hollow members may be provided with a through portion. The penetrating portion penetrates both side walls of the flat hollow body, and is provided in a direction crossing a gas flow in a gap between the flat hollow bodies. The through portion allows gas to flow between both side walls of the flat hollow body and makes the temperature of the gas uniform, so that heat transfer to each flat hollow body is uniform. The through holes may be provided at the same position in each of the flat hollow bodies, or may be provided at different positions as appropriate. In addition, by providing such a penetrating portion, the strength of the flat hollow body is improved.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which the present invention is implemented as a hot water boiler will be described below with reference to FIGS. FIG. 1 is an explanatory view of a cross-sectional plane of the first embodiment of the present invention, FIG. 2 is an explanatory view of a cross section taken along line II-II of FIG. 1, and FIG. FIG. 4 is an explanatory view showing an enlarged cross section along the line IV-IV in FIG. 3, and FIG. 5 is an enlarged view showing a cross section of the heat exchanger of the first embodiment. FIG. 6 is an explanatory diagram showing a schematic configuration of a connection procedure of pipes in the first embodiment, and FIG. 7 is an enlarged cross-sectional view taken along line VII-VII of FIG. FIG.

In FIGS. 1 and 2, a heat exchanger 1 for exchanging heat of a fluid to be heated is formed by integrating a plurality of (five in this first embodiment) flat hollow bodies 2, 2,. It consists of. Each of the flat hollow bodies 2 is arranged with a suitable gap 3 interposed therebetween in the thickness direction of each of the flat hollow bodies 2 and is integrated by connecting them. Each of the flat hollow bodies 2 is a flat container having a substantially rectangular parallelepiped shape formed by joining plate-like members. In the first embodiment, each of the flat hollow bodies 2 has substantially the same size.

The heat exchanger 1 is accommodated in a casing 4 having a substantially rectangular parallelepiped shape. A burner 5 is provided on one side (the left side in FIGS. 1 and 2) of the casing 4, and an exhaust gas outlet 6 is provided on the other side (the right side in FIGS. 1 and 2). Therefore, a gas passage 7 from the burner 5 to the exhaust gas outlet 6 is formed in the casing 4. Here, in the first embodiment, the burner 5 is a premix type surface burner.

The heat exchanger 1 is arranged such that the flat hollow bodies 2 are arranged in the width direction of the gas passage 7.
It is accommodated in the casing 4. Therefore, the heat exchanger 1 is arranged in the gas passage 7 so that the combustion gas flows in each of the gaps 3. The combustion gas in this case contains combustion gas in a flame state, and flows through each of the gaps 3 in a flame state at least on the upstream side close to the burner 5. Here, the width direction of the gas passage 7 is defined as a left-right direction with respect to the longitudinal direction when a direction from the burner 5 to the exhaust gas outlet 6 in the gas passage 7 is a longitudinal direction. Vertical direction)
Say.

Next, each of the flat hollow members 2 will be described in detail with reference to FIGS. Each of the flat hollow bodies 2 is formed by joining two divided bodies, that is, a first divided body 8 and a second divided body 9. Each of the first divided bodies 8 and each of the second divided bodies 9 are dish-shaped members having concave portions, and are manufactured from plate-shaped members by, for example, press working.

Each of the first divided bodies 8 and each of the second divided bodies 9
Are formed at the same time when each of the divided bodies 8 and 9 is pressed. That is, as shown in FIG. 3 and FIG.
A first joint portion 10 is formed at each open end of the second divided body 9, and a second joint portion 1 is formed at each open end of each of the second divided bodies 9.
1 is formed. The respective dimensions and shapes are set so that the first joints 10 enter the second joints 11.

In the state where each of the divided bodies 9 and 10 is assembled as each of the flat hollow bodies 2,
A connecting portion between adjacent flat hollow bodies 2 is provided. This connecting portion is also formed simultaneously when each of the divided bodies 8 and 9 is pressed. That is, as shown in FIGS. 3 to 5, the first connecting portions 12, 12,. In each of the second divided bodies 9, second connecting portions 13, 1 are provided at four locations on the upper, lower, left, and right sides of each side wall.
3, ... are formed in a protruding state. The respective dimensions and shapes are set so that each of the first connecting portions 12 enters into each of the second connecting portions 13.

In order to manufacture the heat exchanger 1 from each of the divided bodies 8 and 9, the first divided bodies 8 and the second divided bodies 9 corresponding to the respective flat hollow bodies 2 are overlapped with each other, A laminated body of the divided bodies 8 and 9 is formed. At this time, at least one of the outer peripheral side of each of the first joints 10 and the inner peripheral side of each of the second joints 11 and the first connecting part 1
A paste brazing material is applied to at least one of the outer peripheral side of the second and the inner peripheral side of each of the second connecting portions 13. As the brazing material at this time, a brazing material having high heat resistance such as copper brazing or nickel brazing is used.

Then, the laminated body of each of the divided bodies 8 and 9 is accommodated in a brazing furnace (not shown) as heating means, and the divided bodies 8 and 9 and the brazing material are heated in the brazing furnace. To perform brazing. By this brazing, as shown in FIG. 4, each of the first joints 10 and each of the second joints 11 are integrally fixed, and are formed as the flat hollow bodies 2. Further, since each of the first connecting portion 12 and each of the second connecting portions 13 are also integrally connected, each of the flat hollow bodies 2 is integrally connected and formed as the heat exchanger 1 ( (See FIG. 5).

As described above, in the state where the heat exchanger 1 is formed, each of the first connecting portions 12 and each of the second connecting portions 13 connect the fluid to be heated between the flat hollow bodies 2. In addition to functioning as a passage, it also functions as a spacer for maintaining each of the gaps 3 at a predetermined size.

As described above, in the first embodiment, the heat exchanger 1 having the plurality of flat hollow bodies 2 can be formed by brazing the divided bodies 8 and 9 together. Therefore, it is not necessary to connect a large number of water pipes to the header or the drum as in the conventional boiler, so that the configuration can be simplified and the number of manufacturing steps can be greatly reduced.

In the boiler, the heat exchanger 1 is supplied with water as a fluid to be heated.
, Hot water as a heated fluid after heating is taken out.
The water supply line 14 and the hot water line 15 for this purpose are connected, for example, as shown in FIG. That is, the water supply line 14 and the hot water line 15 are connected to the flat hollow body 2 located on one side (the lower side in FIG. 1) of the casing 4 among the flat hollow bodies 2. . In detail, the water supply line 14 is a part of each of the second connecting parts 13 in the flat hollow body 2, the second connecting part 1 on the lower part on the burner 5 side (the lower part on the left side in FIGS. 2 and 6).
3 and the hot water line 15 is connected to a second connecting portion 13 in an upper portion (an upper portion on the right side in FIGS. 2 and 6) on the exhaust gas outlet 6 side. Therefore, according to the above configuration, the water inlet portion and the warm water outlet portion of each flat hollow body 2 are located at substantially the same position as each flat hollow body 2.

As shown in FIG. 7, the water supply line 14 is connected to the heat exchanger 1 through a pipe 16 serving as a distribution means.
It is connected to the. The conduit 16 is provided so as to pass through all of the first connecting portions 12 and the second connecting portions 13 at the lower portions of the flat hollow bodies 2 on the burner 5 side. A predetermined number of supply holes 17, 17, 17, 17, 17, 17,
... are provided. Therefore, the water flowing from the pipe 16 is supplied from the respective supply holes 17 to the respective flat hollow bodies 2.
Since it is uniformly supplied to the inside, the inside of each flat hollow body 2 flows in parallel in the same direction.

A circulation line 18 is connected to the boiler as dead water area eliminating means (see FIG. 6).
The circulation line 18 is connected to the remaining two second connecting portions 13 of the second connecting portions 13, that is, the second connecting portions 1 on the upper side on the burner 5 side (the upper portion on the left side in FIGS. 2 and 6).
3 and a lower portion of the exhaust gas outlet 6 (a lower portion on the right side in FIGS. 2 and 6). The circulation line 18 is configured to take out water from an upper portion of the heat exchanger 1 on the burner 5 side and to flow the water to a lower portion on the exhaust gas outlet 6 side. Further, the downstream side of the circulation line 18, that is, the inflow side to the heat exchanger 1 is also connected to the heat exchanger 1 via a pipe 16 similar to the water supply line 14.

Here, with respect to the upstream side of the hot water line 15 and the circulation line 18, the water supply line 14
Similarly to the above, the pipe 16 is preferably provided as a water collecting means, but since the upstream side of the hot water line 15 and the circulation line 18 is an outlet side from each of the flat hollow bodies 2, The conduit 16 can be omitted. That is, as described above, if the flow rate of the water supply from the downstream side of the water supply line 14 and the circulation line 18 to the inside of each of the flat hollow bodies 2 is made uniform by the conduit 16 as the distribution means, The hot water line 1 from inside the flat hollow body 2
This is because the flow rate taken out to the upstream side of the circulation line 18 and the circulation line 18 becomes substantially uniform.

In the boiler having the above configuration, in order to obtain hot water, first, water is supplied from the water supply line 14 into the flat hollow bodies 2 to fill the flat hollow bodies 2 with water. Then, the water in each of the flat hollow bodies 2 is circulated by the circulation line 18.

When the burner 5 is ignited in this state, the premixed gas from the burner 5 becomes a combustion gas in a flame state and flows into the gaps 3 almost uniformly. The combustion gas flowing into each of the gaps 3 flows toward the exhaust gas outlet 6 while performing heat transfer with the flat hollow bodies 2, and is discharged from the exhaust gas outlet 6 as exhaust gas. The water in the heat exchanger 1 is heated while flowing in parallel in each flat hollow body 2, and is taken out from the hot water line 15 as hot water.

As described above, in the first embodiment, since the water flowing inside each of the flat hollow bodies 2 flows in parallel in the same direction, the water flows uniformly from the combustion gas to each of the flat hollow bodies 2. Heat transfer is performed. Moreover, in the first embodiment, since the water in the heat exchanger 1 is circulated by the circulation line 18, the flat hollow body 2
In this case, it is possible to prevent a dead water area from being generated in the inside, and to prevent a short supply of water from the water supply line 14 to the hot water line 15 in each of the flat hollow bodies 2, thereby preventing a decrease in heat recovery rate.

Further, since the temperature of the water in the heat exchanger 1 is made uniform by the circulation line 18, it is possible to prevent the heat exchanger 1 from overheating. That is, assuming that water is locally heated in each of the flat hollow bodies 2, the water becomes bubbles by heating. Then, since only the flat hollow body 2 receives heat in this portion, the flat hollow body 2 is overheated. However, since the temperature of water in each of the flat hollow bodies 2 is made uniform by the circulation line 18, local evaporation does not occur, and
Overheating of each flat hollow body 2 can be prevented.

In the first embodiment, a predetermined number of protrusions 19 as heat transfer promoting means may be provided on the side wall of each flat hollow body 2, that is, on the heat transfer surface (see FIGS. 3 and 4). Due to these convex portions 19, the heat transfer area of each flat hollow body 2 increases, so that the heat recovery rate increases. Also,
Since each of the projections 19 also functions as a reinforcing means, the strength of the side wall of each of the flat hollow bodies 2 is improved, and the pressure resistance of each of the flat hollow bodies 2 is improved. Therefore, each of the divided bodies 8 and 9 can be formed by using a thinner plate-shaped member, and press working and the like can be easily performed. Further, each of the projections 19 has a size, a shape, and a shape such that the projections 19 are in contact with each other between the adjacent flat hollow bodies 2.
By setting the arrangement position, the adjacent flat hollow bodies 2
Since the heat transfer surfaces facing each other can be prevented from trying to deform due to the pressure in each flat hollow body 2, the strength of each flat hollow body 2 is further improved. Further, as described above, when the respective convex portions 16 are configured to be in contact with each other,
It can also be used as a spacer for maintaining each of the gaps 3 (see FIG. 5).

In the first embodiment, each flat hollow body 2 may be provided with a penetrating portion 20 penetrating between both side walls (see FIGS. 3 to 5). Each of the penetrating portions 20 is provided in a predetermined number so that the penetrating direction intersects the flow of the combustion gas. When the respective through portions 20 are provided, the combustion gas in the respective gaps 3 mutually circulates through the respective through portions 20, and the temperature of the combustion gas in the respective gaps 3 becomes uniform. Uniform heat transfer to the hollow body 2 can be performed. In addition, when the respective through-holes 20 are provided in the respective flat hollow bodies 2, the strength of the side walls of the respective flat hollow bodies 2 can be improved.
Can be improved.

Further, in the first embodiment, as shown in FIG. 8, each of the first joint portions 10 and each of the second joint portions 11 have the opening ends of the divided bodies 8 and 9 inwardly. It is also possible to have a shape bent toward. In this case, at the time of joining the first divided bodies 8 and the second divided bodies 9, the first joints 10 and the second joints 11 are overlapped with each other.

Next, a second embodiment of the present invention will be described.
This will be described with reference to FIGS. FIG. 9 is an explanatory view of a cross-sectional plane of the second embodiment of the present invention, and FIG. 10 is an explanatory view of a cross section taken along line XX of FIG. 9 and 10 showing the second embodiment, the same reference numerals as those in FIGS. 1 to 7 showing the first embodiment denote the same members, and a detailed description thereof will be omitted.

In the second embodiment, each of the flat hollow members 2 is made of a thin plate-like third divided member 21 and a fourth divided member 22.
And a frame-shaped fifth divided body 23. Therefore, when manufacturing each of the flat hollow bodies 2, each of the fifth divided bodies 23 is sandwiched between each of the third divided bodies 21 and each of the fourth divided bodies 22, and each of the divided bodies 21 ~ 2
3 are joined by brazing.

The adjacent flat hollow bodies 2 are connected to each other by connecting the four upper, lower, left and right sides of both side walls of the flat hollow bodies 2 by connecting pipes 24, 24,. These connecting pipes 24 and the flat hollow bodies 2 are connected by, for example, brazing.

Further, in the second embodiment, the corrugated plate members 25 are sandwiched between the flat hollow members 2. Each of these corrugated plate members 25 functions as a heat transfer promoting unit, and also functions as a spacer for maintaining each of the gaps 3.

In the second embodiment, similarly to the first embodiment, it is not necessary to connect a large number of water pipes to the header or the drum as in the conventional boiler, and the configuration can be simplified. Also in the second embodiment, the heat exchanging body 1 can be formed by brazing the divided bodies 21 to 23 and the flat hollow bodies 2 collectively. Can be reduced. Here, in the second embodiment, even if the connection of the divided bodies 21 to 23 and the flat hollow bodies 2 is performed by welding, a large number of water pipes are connected to a header or a drum as in a conventional boiler. In this case, the number of manufacturing steps can be reduced as compared with the case of performing the above.

In the second embodiment, each of the connecting pipes 24 is a separate member from each of the flat hollow bodies 2. However, as in the first embodiment, each of the first connecting portions 12 is provided.
And each said 2nd connection part 13 can also be set as the structure provided integrally with each of said 3rd divided body 21 and each of said 4th divided body 22, respectively.

Next, a third embodiment of the present invention will be described.
This will be described with reference to FIGS. FIG.
Is an explanatory view of a longitudinal side surface of the third embodiment of the present invention,
FIG. 12 is an explanatory diagram of a cross section taken along line XII-XII in FIG. In FIGS. 11 and 12 showing the third embodiment, the same reference numerals as those in FIGS. 9 and 10 showing the second embodiment denote the same members, and a detailed description thereof will be omitted.

In the third embodiment, a plurality of flat hollow bodies 2,
This is an embodiment in which the heat exchanger 1 is constructed by connecting 2,... Between upper and lower headers. That is, in the third embodiment, the strip-shaped sixth divided body 26 and the seventh divided body 27 are sandwiched between the third divided bodies 21 and the fourth divided bodies 22, respectively. In this state, the flat hollow bodies 2 are opened at the upper and lower ends. The upper and lower ends of the flat hollow members 2 are connected to an upper header 28 and a lower header 29, respectively. In the third embodiment, a hot water outlet 30 is provided in the upper header 28, and a water supply line 14 (not shown in FIG. 11) is connected to the lower header 29.

In the third embodiment, each flat hollow body 2 is connected to the upper header 28 and the lower header 29.
The heat exchanger 1 is connected between the upper header 28 and the lower header 29 like a conventional boiler (a water pipe in a conventional boiler). ) Is significantly reduced, so that the configuration can be simplified. Further, in the third embodiment, the heat exchanger 1 is manufactured by brazing the divided bodies 21, 22, 26, 27 and the flat hollow bodies 2 all together. Although the man-hour can be reduced, even if welding is performed instead of this brazing, compared with the case where many water pipes are connected to the header or drum like a conventional boiler,
The number of manufacturing steps can be reduced.

Next, a fourth embodiment of the present invention will be described.
This will be described with reference to FIGS. FIG.
Is an explanatory view of a cross-sectional plane of a fourth embodiment of the present invention,
FIG. 14 is an explanatory diagram of a cross section taken along line XII-XII in FIG. In FIGS. 13 and 14 showing the fourth embodiment, the same reference numerals as those in FIGS. 1 and 2 showing the first embodiment denote the same members, and a detailed description thereof will be omitted.

The fourth embodiment is an embodiment in which each flat hollow body 2 located on both outer sides (upper and lower sides in FIG. 13) of the heat exchanger 1 is used as a part of a casing. That is, in the fourth embodiment, the upper surface (upper side in FIG. 14) and the lower surface (lower side in FIG. 14) of the heat exchanger 1 are provided with the first casing component 31 and the second casing component 32, respectively. Thereby, the gaps 3 between the flat hollow bodies 2 on the upper surface and the lower surface of the heat exchanger 1 are closed. Then, a burner 5 is mounted on one side surface (the left side in FIGS. 13 and 14) of the heat exchanger 1 via a suitable mounting member 33, and an exhaust gas outlet 6 is mounted on the other side surface (the right side in FIGS. An exhaust gas outlet component 34 to be formed is attached.

Therefore, in the fourth embodiment,
The gas passage 7 is formed by the flat hollow bodies 2 located on both outer sides of the heat exchanger 1, the first casing component 31 and the second casing component 32. Therefore, in the fourth embodiment, the burner 5, the first casing component 31, the second casing component 32, and the exhaust gas outlet component 34 are attached around each heat exchanger 1. ,
The heat exchanger 1 can be configured as a boiler.

In the fourth embodiment, instead of providing the first casing component 31 and the second casing component 32 in the heat exchanger 1, an upper portion on each side surface of each flat hollow body 2 is provided. At each of the lower portions (upper and lower portions in FIG. 14), a ridge (not shown) is formed over the entire length of the flat hollow body 2 (the left-right direction in FIGS. 13 and 14), and these ridges are formed. Are connected to the side surfaces of the adjacent flat hollow bodies 2 so that the gaps 3 between the flat hollow bodies 2 on the upper surface and the lower surface of the heat exchanger 1 can be closed.

[0062]

According to the present invention, the structure of the heat exchanger of the boiler can be simplified, and the number of manufacturing steps can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a transverse plane according to a first embodiment of the present invention.

FIG. 2 is an explanatory view of a cross section taken along line II-II of FIG.

FIG. 3 is an explanatory view showing a side surface of the flat hollow body of FIG. 1;

FIG. 4 is an explanatory diagram showing an enlarged cross section along line IV-IV in FIG. 3;

FIG. 5 is an explanatory diagram showing an enlarged cross section of the heat exchanger of the first embodiment.

FIG. 6 is an explanatory diagram showing a schematic configuration of a connection procedure of pipes in the first embodiment.

FIG. 7 is an explanatory diagram showing an enlarged cross section along line VII-VII in FIG. 6;

FIG. 8 is an enlarged sectional explanatory view showing another example of the joint portion of the flat hollow body in the present invention.

FIG. 9 is an explanatory view of a transverse plane according to the second embodiment of the present invention.

FIG. 10 is an explanatory diagram of a cross section taken along line XX of FIG. 9;

FIG. 11 is an explanatory view of a vertical side surface of a third embodiment of the present invention.

FIG. 12 is an explanatory diagram of a cross section taken along line XII-XII of FIG. 11;

FIG. 13 is an explanatory view of a transverse plane according to a fourth embodiment of the present invention.

FIG. 14 is an explanatory diagram of a cross section taken along line XIV-XIV in FIG. 11;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Flat hollow body 18 Circulation line (dead water area eliminating means) 19 Convex part (heat transfer promoting means) 20 Penetration part 25 Corrugated plate member (heat transfer promoting means)

Claims (6)

[Claims] 1. A flat hollow body 2 for exchanging heat of a fluid to be heated
And a heat exchanger 1 formed by arranging a predetermined number of the flat hollow bodies 2 in the thickness direction thereof. 2. An inlet portion of the fluid to be heated and an outlet portion of the heated fluid or steam after heating in each of the flat hollow bodies 2 are provided at substantially the same position in each of the flat hollow bodies 2. The boiler according to claim 1, wherein: 3. At least one of the flat hollow bodies 2 includes a dead water area eliminating means 18 for a fluid to be heated in the flat hollow bodies 2. The boiler according to claim 1 or 2. 4. The method according to claim 1, wherein at least one of the flat hollow bodies 2 has a heat transfer promoting means on a side wall thereof. The described boiler. 5. Each of the flat hollow bodies 2 has a reinforcing means on a side wall thereof, and facing reinforcing means of the reinforcing means are in contact with each other.
The boiler according to any one of the above. 6. The flat hollow body 2 of at least one of the flat hollow bodies 2 includes a penetration portion 20 penetrating between both side walls thereof. The boiler according to item 1.