JP6256807B2 - Heat exchanger and hot water device provided with the same - Google Patents

Description

  The present invention relates to a heat exchanger configured to recover heat from a heating gas such as a combustion gas by using a fin tube type heat transfer tube, and a hot water apparatus such as a hot water supply apparatus provided with the heat exchanger.

As a hot water device such as a gas hot water supply device, a so-called one-can two-circuit heat exchange in which first and second heat exchanging portions using finned tube type heat transfer tubes are provided side by side in a single can body. Some are equipped with a container (for example, Patent Documents 1 and 2). The first heat exchange unit is used for, for example, hot water heating for general hot water supply, and the second heat exchange unit is used for, for example, hot water heating for heating or bath hot water.
In the heat exchangers described in Patent Documents 1 and 2, the top and bottom widths of the fins of the first and second heat exchange units are substantially the same.

  However, the prior art still has room for improvement as described below.

  In other words, the first and second heat exchanging parts of the heat exchanger may basically be designed and manufactured so as to have the hot water heating capacity required for each, and the first and second heat exchanging units. It is not always necessary to make the number of stages (the number of arrangements in the vertical direction) of the respective heat transfer tubes of the section the same. Further, the vertical widths of the fins are not necessarily equal. Therefore, when designing and manufacturing the heat exchanger, the first and second heat exchangers are made different by changing the number of heat transfer tubes arranged in the first and second heat exchange sections and by making the vertical widths of the fins different. It is conceivable to reduce the overall size and the manufacturing cost while ensuring the hot water heating capacity required for the replacement part.

  However, for example, if the vertical width of the fins of the first heat exchange part is made smaller than the vertical width of the fins of the second heat exchange part, the side wall surrounding the first heat exchange part in the can body of the heat exchanger In the portion, a region that does not face the fins is generated with a large area. In the vicinity of such a region, since the heat recovery effect by the fins cannot be expected, the region may be heated to an abnormally high temperature by a high-temperature combustion gas and may be overheated. From the viewpoint of suitably preventing thermal damage of the can body, it is desirable to pay attention to appropriately prevent such a concern.

JP 2011-33208 A JP 2013-11409 A

  The present invention has been conceived under the circumstances as described above, and the side wall of the can body is overheated by the action of a heating gas such as combustion gas while suitably reducing the manufacturing cost. It is an object of the present invention to provide a heat exchanger that can appropriately prevent the possibility of becoming a state, and a hot water device provided with the heat exchanger.

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

  The heat exchanger provided by the first aspect of the present invention includes a can body in which the heating gas flows into the can body, and the can body so as to line up in a direction intersecting the flow direction of the heating gas. And a plurality of plate-like fins and first and second heat exchange sections each having a plurality of plate-like fins and heat transfer tubes penetrating through the plurality of fins, the first heat exchange The part is a heat exchanger in which the number of heat transfer tube arrangements in the heating gas flow direction is smaller than that of the second heat exchange part, and all or one of the plurality of fins of the first heat exchange part. The width of the heating gas flow direction is narrower than the plurality of fins of the second heat exchange unit, and the side wall portion of the can body among the plurality of fins of the first heat exchange unit The fins facing through the first gap close the first gap and Use gas is characterized in that it is configured as a fin for a can body heating suppressed to prevent passing through the first gap.

According to such a configuration, the following effects can be obtained.
First, the first heat exchange unit has a smaller number of heat transfer tube arrangements than the second heat exchange unit, and correspondingly, all of the plurality of fins of the first heat exchange unit or Some of the fins in the second heat exchanging portion are narrower in the direction of the gas flow for heating than the plurality of fins. The size can be reduced. Since fins are provided in a large number from the viewpoint of increasing the amount of heat recovery, if the size of the plurality of fins of the first heat exchange unit is reduced, the manufacturing cost of the entire heat exchanger is greatly increased. Reduction and overall weight reduction can be suitably achieved.
On the other hand, as the width of the fin in the first heat exchanging portion in the heating gas flow direction is narrowed, the portion corresponding to the first heat exchanging portion of the side wall portion of the can body faces the fin. There is a possibility that a region not to be formed is formed widely. On the other hand, the first heat exchanging portion is provided with a fin for suppressing the heating of the can body, and the first gap formed between the fin and the side wall portion of the can body is closed. Therefore, the heating gas does not pass through the first gap, and the high-temperature heating gas can be made difficult to directly act on the side wall portion of the can body. Therefore, it is possible to prevent a problem that the side wall portion of the can body is heated to an abnormally high temperature and thermally damaged due to the narrowing of the fin width.

  In the present invention, it is preferable to further include a seal member interposed between a flange portion formed on the opening peripheral edge of the can body and a connection target member of the flange portion, and a part of the seal member Is a projecting portion projecting toward the inside of the can body from the flange portion, and the projecting portion is formed on the side wall portion of the can body among the plurality of fins of the second heat exchange section. A second gap formed between the closest fin and the side wall is closed.

According to such a configuration, the heating gas is prevented from passing through the second gap formed between the fin of the second heat exchange unit and the side wall of the can body. Of the side wall of the body, the portion corresponding to the second heat exchange unit is also preferably prevented from being heated to an abnormally high temperature. Of the side wall of the can, the portion corresponding to the second heat exchanging portion faces the wide fin, so that it is heated to a high temperature in the relative comparison with the portion corresponding to the first heat exchanging portion. Although it is difficult to do so, as described above, if the portion corresponding to the second heat exchanging portion is actively prevented from being overheated, the reliability in preventing the thermal damage of the can body can be further increased. Can do.
Further, in the above-described configuration, since a fin and a seal member used for connecting the flange of the can body are used as means for closing the second gap, it is necessary to separately use a special dedicated member. No increase in manufacturing cost can be avoided.

  In the present invention, it is preferable that the protruding portion of the seal member is also provided at a location corresponding to the first heat exchange portion, and the fin for suppressing the heating of the can body includes the first heat exchange. The first gap is closed by making the width in the heating gas flow direction larger than the other plurality of fins and contacting the protruding portion of the seal member.

  According to such a configuration, a sealing member used for flange connection of the can body is effectively used as a means for closing the first gap. Moreover, since the fin for suppressing the heating of the can body only needs to be increased in width and brought into contact with the seal member, its manufacture is easy. Therefore, it is more preferable in reducing the manufacturing cost.

  In the present invention, preferably, the fin for suppressing heating of the can body has a bent portion bent toward the side wall portion of the can body, and the bent portion is in contact with the side wall portion. The first gap is closed.

  According to such a configuration, it is possible to close the first gap without increasing the width of the fin for suppressing the heating of the can body and without using other members other than the can body. Therefore, it is also preferable in reducing the manufacturing cost.

  In the present invention, preferably, the side wall portion of the can body is provided with a protruding step portion protruding toward the inside of the can body, and the protruding step portion and the fin for suppressing heating of the can body are contacted. Due to the contact, the first gap is closed.

  Even in such a configuration, it is possible to appropriately close the first gap while reducing the manufacturing cost without using a special dedicated member.

The hot water apparatus provided by the second aspect of the present invention includes the heat exchanger provided by the first aspect of the present invention.
According to such a configuration, the same effect as described for the heat exchanger provided by the first aspect of the present invention can be obtained.

  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.

It is a schematic front sectional view showing an example of a hot water apparatus provided with a heat exchanger (primary heat exchanger) to which the present invention is applied. It is II-II sectional drawing of FIG. FIG. 3 is a sectional view taken along line III-III in FIG. 1. It is a plane sectional view of the primary heat exchanger shown in FIG. (A) is a partial expanded sectional view of the primary heat exchanger shown in FIG. 1, (b) is a Vb-Vb sectional view of (a), (c) is Vc of (a). It is -Vc sectional drawing. It is a principal part exploded sectional view which shows the state which mounts | wears with a partition member, (b) is principal part sectional drawing. It is principal part front sectional drawing which shows the other example of this invention. It is principal part front sectional drawing which shows the other example of this invention.

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

1 to 5 show an example of a hot water apparatus to which the present invention is applied, and a configuration related thereto.
As clearly shown in FIG. 1, the hot water device WH of the present embodiment includes a burner 5, a primary heat exchanger HE 1, a secondary heat exchanger HE 2, and an exterior case 90 surrounding them. This hot water apparatus WH can independently perform two hot water supply operations, ie, general hot water supply and heating hot water supply or bath hot water supply. The primary heat exchanger HE1 and the secondary heat exchanger HE2 are both One can two circuit system.
The primary heat exchanger HE1 corresponds to an example of a heat exchanger according to the present invention. The secondary heat exchanger HE2 does not correspond to the heat exchanger according to the present invention.

  The burner 5 is a gas burner, for example, and burns fuel gas by using combustion air sent upward from the fan 51 into the burner case 50. However, the combustion region of the burner 5 is divided into first and second combustion regions a1 and a2 that can individually control the combustion operation of the fuel, and the upper region is partitioned by a partition member 52. . Thus, the combustion gas generated in each of the first and second combustion regions a1 and a2 travels individually toward the first and second heat exchange portions A1 and A2 of the primary heat exchanger HE1. It is supposed to be.

  The primary heat exchanger HE1 is for recovering sensible heat from the combustion gas traveling upward from the burner 5, and the first and second heat exchangers HE1 are disposed in the can body 6 mounted on the burner case 50. In this configuration, a plurality of plate-like fins 2A and 2B constituting the two heat exchange portions A1 and A2 and a plurality of heat transfer tubes 11a and 11b penetrating them are accommodated. However, as a fin of the first heat exchanging part A1, a fin heating suppression fin 2A 'described later is also provided.

  The can body 6 has a substantially rectangular frame shape or cylindrical shape in plan view with an upper surface portion and a lower surface portion opened, and is made of, for example, copper. Similarly to the can 6, the heat transfer tubes 11 a and 11 b and the fins 2 </ b> A and 2 </ b> B are made of, for example, copper. The first heat exchange part A1 has a larger occupation area than the second heat exchange part A2. This is because the first heat exchanging unit A1 is used for heating hot water for general hot water supply, and thus requires high hot water heating capability.

  As shown in FIG. 4, the heat transfer tube 11a of the first heat exchange section A1 is a straight tube that penetrates the fin 2A, and both ends of each heat transfer tube 11a pass through the side wall portions 60a and 60b of the can body 6. And it is connected in series via a substantially U-shaped connecting tube 12a. The plurality of heat transfer tubes 11a are in a horizontal posture, and are arranged in a row in the width direction of the can 6 (the left-right direction in the figure). The plurality of heat transfer tubes 11a are arranged in a single upper and lower stage (one stage) as shown in FIG. One end of the connecting tube 12a ′ connected to the heat transfer tube 11a near the side wall 60c of the can 6 is a water inlet 15a, and the hot water supplied to the water inlet 15a is a plurality of heat transfer tubes 11a. And after passing through the connecting pipe body 12a and passing through the heat transfer pipe 11a located near the center of the can body 6, it flows out from the hot water outlet 16a. In such a distribution process, the hot water is heated.

  The plurality of heat transfer tubes 11b of the second heat exchanging portion A2 are straight tubes that penetrate the fins 2B, and also penetrate the side wall portions 60a and 60b of the can body 6, and have a substantially U-shaped connecting tube 12b. It is connected to a series via. Unlike the first heat exchange section A1, the plurality of heat transfer tubes 11b are arranged in two upper and lower stages (in the drawing, the heat transfer tubes 11b have two upper stages and three lower stages). Preferably, the lower heat transfer tube 11b is substantially the same height as the heat transfer tube 11a of the first heat exchange section A1. One end of the connecting tube 12b ′ connected to the lower heat transfer tube 11b located near the side wall portion 60d of the can 6 is a water inlet 15b, and the hot water supplied to the water inlet 15b is After flowing through the plurality of heat transfer tubes 11b, it flows into the upper plurality of heat transfer tubes 11b and flows out from the hot water outlet 16b. In such a process, the hot water is heated.

The fins 2A of the first heat exchange part A1 have a smaller width in the vertical height direction, that is, the width in the flow direction of the heating gas than the fins 2B of the second heat exchange part A2 (can body heating suppression). Except for the fins 2A ′). More specifically, as shown in FIG. 1, the lower edges 22a and 22b of the fins 2A and 2B are both close to the height of the lower edge of the can 6 and are substantially identical to each other. It is aligned with the height. On the other hand, for the upper edge portions 21a and 21b of the fins 2A and 2B, the upper edge portion 21a is lower than the upper edge portion 21b. The upper edge portion 21 b is substantially the same height as the upper edge portion of the can body 6. In the gap 68 formed between the fins 2A and 2B, a partition member 53 that partitions the first and second heat exchange portions A1 and A2 is interposed. Although not shown in the drawings, the fins 2A and 2B have a plurality of convex portions (protrusions by cutting and raising, burring portions, etc.) in which appropriate portions of the fins 2A and 2B are partially projected. ) Is provided. These convex portions are useful for increasing the degree of contact between the fins 2A and 2B and the combustion gas and increasing the amount of heat recovery.

As shown in FIG. 2 and FIG. 4, the can heating suppression fin 2A ′ is a fin located at the end of the array of the plurality of fins 2A, and is second to the side wall portions 60a and 60b of the can body 6. A pair is provided so as to face each other through one gap c1. The fin 2A ′ for suppressing heating of the can body has a vertical width larger than that of the other fins 2A, that is, the width in the flow direction of the heating gas, and the upper portion thereof is a seal provided on the upper portion of the can body 6 It is in contact with the member 30. As a result, the upper part of the first gap c1 is closed.
More specifically, a flange portion 62 for connection to the auxiliary can body 3 (collecting cylinder) is provided at the opening peripheral edge of the upper portion of the can body 6, and the flange portion 62 and the auxiliary can body 3 are connected to each other. A seal member 30 (packing) is interposed between the lower portion and the lower portion. The seal member 30 is made of a material excellent in heat resistance and has a rectangular frame shape that is similar to the flange portion 62 in a plan view, but the inner peripheral edge portion is closer to the can body 6 than the flange portion 62. The protruding portion 30a protrudes inward. As a result of the upper part of the fin 2A ′ for suppressing the heating of the can contacting the protruding part 30a, the upper part of the first gap c1 is closed. The auxiliary can body 3 is for guiding the combustion gas that has passed through the first heat exchanger HE1 to the air inlets 71a and 71b of the second heat exchanger HE2.

  As shown in FIG. 3, in the second heat exchanging part A <b> 2, the upper portions of the pair of fins 2 </ b> B ′ located at both ends of the arrangement of the plurality of fins 2 </ b> B are in contact with the protruding parts 30 a of the seal member 30. Thus, the upper portion of the second gap c2 formed between each of the pair of fins 2B 'and the side wall portions 60a and 60b of the can 6 is closed. As shown in FIG. 1, among the fins 2 </ b> B, the upper part of one end in the longitudinal direction near the side wall 60 d of the can body 6 is also in contact with the seal member 30.

  FIG. 5 shows a structure in the vicinity of one end in the longitudinal direction near the side wall 60c of the can 6 among the plurality of fins 2A. As shown in FIGS. 4A and 4C, one end portion of each fin 2A in the longitudinal direction is provided with a bent portion 26 having a substantially L shape in plan view. The side wall portion 60c is brazed. The bent portions 26 are not only provided on the end surfaces extending in the vertical direction of the fins 2A, but are continuously formed up to the inclined portions 27 of the fins 2A shown in FIG. Has been. As a result, as shown in FIG. 5B, the upper portion of the gap c3 formed between the adjacent fins 2A (the gap formed near the longitudinal end of the fin 2A) is bent. Blocked by the portion 26. According to such a structure, as indicated by an arrow in FIG. 5A, the combustion gas that has entered the gap c3 is guided in a direction away from the side wall 60c due to the presence of the bent portion 26, and the side wall 60c. Of these, the combustion gas is less likely to act on the region above the junction with the fin 2A. For this reason, it is suppressed that the side wall part 60c is heated by high temperature. The fact that the fins 2 </ b> A having a heat recovery function are in direct contact with the side wall part 60 c also serves to prevent the side wall part 60 c from being heated to a high temperature. In FIG. 1, one end in the longitudinal direction of the fin 2B near the side wall 60d of the can 6 has the same structure as described above.

Of the fins 2 </ b> A and 2 </ b> B, the other end in the longitudinal direction near the partition member 53 is omitted from the illustration, but the other portions are not shown except that the joining to the partition member 53 is not achieved. The configuration is the same as that described with reference to FIG. That is, the other end in the longitudinal direction of the fins 2A and 2B is provided with a bent portion similar to the bent portion 26 shown in FIG. 5, whereby the combustion gas advances directly above the partition member 53. Is suppressed. Further, since the fins 2 </ b> A and 2 </ b> B are in direct contact with the partition member 53, the temperature rise of the partition member 53 is suppressed. For this reason, the partition member 53 is prevented from being overheated.

  In FIG. 1, a secondary heat exchanger HE2 is for recovering latent heat from the combustion gas that has passed through the primary heat exchanger HE1, and is connected to the primary heat exchanger HE1 via an auxiliary can 3. A plurality of heat transfer tubes 80 and 81 are accommodated in the case 7 and the space between them is partitioned via a partition plate 74. The heat transfer tubes 80 and 81 and the case 7 are made of, for example, stainless steel so as to have corrosion resistance against the strongly acidic drain generated along with the recovery of latent heat. The plurality of heat transfer tubes 80 are formed as spiral tubes having different sizes, and are arranged in an overlapping manner. Their upper and lower ends are drawn to the outside of the case 7 to pass through the header 75a for water flow. , 75b. The plurality of heat transfer tubes 81 are similar in basic form to the heat transfer tubes 80, and are formed as spiral tubes arranged in an overlapping manner, and at the upper and lower ends thereof, a water-flowing header 75c. , 75d are connected.

  As shown in FIG. 2, the combustion gas that has passed through the first heat exchanging portion A1 of the primary heat exchanger HE1 travels from the air supply port 71a into the case 7 and passes through the gap between the heat transfer tubes 80. Then, it is discharged to the outside from the exhaust port 72 of the front wall portion 70b. Further, as shown in FIG. 3, the combustion gas that has passed through the second heat exchange section A2 of the primary heat exchanger HE1 proceeds into the case 7 from the air supply port 71b and passes through the gap between the heat transfer tubes 81. After that, the gas is discharged from the exhaust port 72 to the outside. In such a process, latent heat is recovered from the combustion gas by the heat transfer tubes 80 and 81.

  As shown in FIG. 1, the hot water supplied from the water supply pipe 95a to the external water inlet 90a flows through the heat transfer pipe 80 of the secondary heat exchanger HE2 after passing through the pipe portion 92a and the header 75b. Then, this hot water is sent to the water inlet 15a of the primary heat exchanger HE1 via the header 75a and the piping part 93a, and passes through the plurality of heat transfer tubes 11a of the first heat exchange part A1. The hot water that has passed through the plurality of heat transfer tubes 11a then reaches the external hot water outlet 91a via the piping portion 94a, and is then supplied to, for example, a kitchen or a washroom.

  On the other hand, the hot water supplied from the water supply pipe 95b to the external water inlet 90b is supplied to the header 75d via the piping part 92b and flows through the heat transfer pipe 81 of the secondary heat exchanger HE2. Thereafter, the hot water is sent to the water inlet 15b of the primary heat exchanger HE1 via the header 75c and the piping part 93b, and passes through the plurality of heat transfer tubes 11b of the second heat exchange part A2. The hot water that has passed through the plurality of heat transfer tubes 11b then reaches the external hot water outlet 91b through the piping portion 94b, and is then supplied to the hot water heater or used for hot water supply to the bath.

  Next, the operation of the hot water device WH will be described.

  First, since the vertical width of the fin 2A is reduced, the material cost of the fin 2A can be reduced, and the overall manufacturing cost of the primary heat exchanger HE1 can be reduced. It is also possible to reduce the weight appropriately.

  When the vertical width of the fin 2A is reduced, the area of the side wall portions 60a and 60b of the can 6 that does not face the fin 2A is increased, so that the fin 2A passes through the first gap c1. There is a risk that the region is heated to a considerably high temperature by the combustion gas. However, according to the present embodiment, as described with reference to FIG. 2, the first gap c <b> 1 is closed, so that high-temperature combustion gas is prevented from passing through the first gap c <b> 1. The side walls 60a and 60b are appropriately avoided from being heated to an abnormally high temperature. Therefore, it is possible to prevent the side wall portions 60a and 60b from being thermally damaged.

  As a means for closing the first gap c1, a simple structure is adopted in which the upper part of the fin 2A ′ for suppressing the heating of the can body is brought into contact with the seal member 30, and the seal member 30 is a can. It is used for the connection between the body 6 and the auxiliary can body 3. Further, the fin heating 2A 'for suppressing the heating of the can body is only one having a large vertical width. Therefore, it is easy to manufacture the structure, which is more preferable in reducing the manufacturing cost of the primary heat exchanger HE1.

  On the other hand, the second gap c2 formed between the fin 2B of the second heat exchange part A2 and the side wall parts 60a, 60b of the can 6 is also closed using the seal member 30. The high-temperature combustion gas is also prevented from passing through the second gap c2. If the portion corresponding to the second heat exchanging portion A2 of the side wall portions 60a and 60b is also actively prevented from being overheated, the reliability in preventing overheating of the entire side wall portions 60a and 60b. Can increase the sex. The point that the other side wall portions 60c, 60d and the partition member 53 of the can 6 are prevented from being overheated is as described above with reference to FIG.

In addition, according to the present embodiment, the following operation is also obtained.
First, about the 2nd heat exchange part A2, since the heat exchanger tubes 11b are provided in the upper and lower two stages, the occupation area of the second heat exchange part A2 is larger than the occupation area of the first heat exchange part A1. It is possible to increase the hot water heating capacity while keeping it small. Therefore, even when a large-sized hot water heater is used, it is possible to cope with it appropriately without causing an increase in the overall size of the primary heat exchanger HE1. On the other hand, since the heat transfer tube 11a is provided in a single stage, the structure of the first heat exchanging part A1 can be simplified. Since the first heat exchanging part A1 has a large occupied area, even if the heat transfer tube 11a is a single stage, it is possible to appropriately provide hot water heating capability necessary for general hot water supply. Each heat transfer tube 11a of the first heat exchange unit A1 and the lower heat transfer tube 11b of the second heat exchange unit A2 have substantially the same height. Therefore, the distances from the burner 5 to the heat transfer tubes 11a and 11b are also substantially the same, and both the heat transfer tubes 11a and 11b can be optimally arranged for heat recovery. Since the heights of the lower edge portions 22a and 22b of the fins 2A and 2B are substantially the same, the heat recovery efficiency using the fins 2A and 2B can be increased.

  6 and 7 show another embodiment of the present invention. In the figure, the same or similar elements as those of the above embodiment are denoted by the same reference numerals as those of the above embodiment, and the description thereof is omitted.

In the embodiment shown in FIG. 6, the pair of can body heating suppressing fins 2 </ b> A ′ has a bent portion 25 bent toward the side wall portions 60 a and 60 b of the can body 6. The distal end portion of the bent portion 25 is in contact with the side wall portions 60a and 60b, thereby closing the first gap c1.
In the present embodiment, the first gap c1 is substantially closed by a configuration in which the bent portion 25 is provided in the can body heating suppressing fin 2A ′. Unlike the above-described embodiment, the seal member 30 is not used for closing the gap c1, and for example, in the portion corresponding to the first heat exchange part A1, it is not necessary to provide the protrusion 30a on the seal member 30. Is possible. Thus, according to the present embodiment, it is preferable to simplify the overall configuration and to reduce the manufacturing cost. Moreover, the advantage that it is not necessary to form fin 2A 'for can body heating suppression to a big size is also acquired.

In the embodiment shown in FIG. 7, protruding step portions 65 a and 65 b that protrude toward the inside of the can body 6 are provided on the side wall portions 60 a and 60 b of the can body 6 by pressing. The protruding step portions 65a and 65b and the fin heating suppression fin 2A ′ are in contact with each other, whereby the first gap c1 is closed.
In the present embodiment, the seal member 30 is not used for closing the gap c1, and it is not necessary to form the fin 2A ′ for suppressing the heating of the can in a large size. Substantially, the first gap c1 is closed by a configuration in which the side wall portions 60a and 60b of the can body 6 are simply pressed. Therefore, it is preferable to simplify the overall configuration and reduce the manufacturing cost.

  The present invention is not limited to the contents of the above-described embodiment. The specific configuration of each part of the heat exchanger and the hot water apparatus according to the present invention can be variously modified within the intended scope of the present invention.

  The fin for suppressing the heating of the can in the present invention only needs to be provided so as to block the first gap and prevent the heating gas such as combustion gas from passing through the first gap. The specific configuration can be a structure other than the above-described embodiment.

  In the above-described embodiment, a primary heat exchanger is provided above the burner, and the combustion gas advances from the lower side to the upper side of the primary heat exchanger. On the contrary, it is also possible to adopt a reverse combustion method in which a primary heat exchanger is provided below the burner so that the combustion gas proceeds from the top to the bottom. The heating gas referred to in the present invention is not limited to the combustion gas, and for example, high-temperature exhaust gas discharged from a power generation unit such as a fuel cell or a gas engine of a cogeneration system can also be used.

  In the above-described embodiment, the first heat exchanging section is provided with the heat transfer tubes in a single stage, and the second heat exchanging section is provided with the heat transfer tubes in two stages. However, the present invention is limited to this. Not. For example, the present invention can also be applied to a case where the first heat exchange section is a two-stage arrangement of heat transfer tubes and the second heat exchange section is arranged in a three-stage arrangement of heat transfer tubes or more stages. . Although the heat exchanger according to the present invention is suitable for sensible heat recovery, it does not matter whether it is for sensible heat recovery or latent heat recovery. The hot water device as used in the present invention means a device having a function of generating hot water, and is used for various types of hot water supply devices for general hot water supply, bath hot water supply, heating, snow melting, and the like, and hot water supply. Widely includes equipment for producing hot water.

WH water heater HE1 primary heat exchanger (heat exchanger according to the present invention)
HE2 Secondary heat exchangers A1 and A2 First and second heat exchanging parts c1 First gap c2 Second gap 2A and 2B Fin 2A 'Fin for heating suppression of can body Partition member 6 Can bodies 11a and 11b Heat transfer tube 25 Bent part 60a-60d Side wall part (can body)
65a, 65b protruding step (on the side wall of the can)

Claims (6)

One can into which the heating gas flows,
A first member is provided in the can so as to be arranged in a direction intersecting with the flow direction of the heating gas, and each has a plurality of plate-like fins and a heat transfer tube penetrating the plurality of fins. And a second heat exchange part,
With
The first heat exchanging unit is a heat exchanger in which the number of heat transfer tube arrays in the gas flow direction for heating is smaller than that of the second heat exchanging unit,
All or a part of the plurality of fins of the first heat exchange unit has a width in the heating gas flow direction narrower than the plurality of fins of the second heat exchange unit,
Of the plurality of fins of the first heat exchange section, the fin facing the side wall of the can through the first gap closes the first gap and the heating gas is the first fin. It is comprised as a fin for can body heating suppression which prevents passing through the clearance gap of this, The heat exchanger characterized by the above-mentioned. The heat exchanger according to claim 1,
A seal member interposed between a flange portion formed on the opening periphery of the can body and a connection target member of the flange portion; and
A part of this seal member is a protruding portion that protrudes toward the inside of the can body from the flange portion,
The projecting portion closes a second gap formed between the fin closest to the side wall portion of the can body and the side wall portion among the plurality of fins of the second heat exchanging portion. A heat exchanger. The heat exchanger according to claim 2,
The protruding portion of the seal member is also provided at a location corresponding to the first heat exchange portion,
The fin for suppressing the heating of the can is in contact with the protruding portion of the seal member by making the width in the heating gas flow direction larger than the plurality of other fins of the first heat exchange unit, The heat exchanger, wherein the first gap is closed. The heat exchanger according to claim 1 or 2,
The fin for suppressing the heating of the can body has a bent portion bent toward the side wall portion of the can body, and the bent portion is in contact with the side wall portion, whereby the first gap is closed. Heat exchanger. The heat exchanger according to claim 1 or 2,
The side wall portion of the can body is provided with a protruding step portion protruding toward the inside of the can body, and the protruding step portion is in contact with the fin for suppressing the heating of the can body, A heat exchanger in which the first gap is closed.   A hot water apparatus comprising the heat exchanger according to any one of claims 1 to 5.

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