JP5988086B2 - 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.

A heat exchanger used in a hot water device such as a gas hot water supply device has a structure in which a large number of plate-like fins are arranged in the thickness direction thereof and heat transfer tubes are passed through these fins and joined. is there. In such a heat exchanger, as a means for increasing the amount of heat recovery, a plurality of straight tube bodies constituting the heat transfer tube are arranged in a horizontal direction at an appropriate interval, and such a straight shape is formed. A means for providing a plurality of rows of tube parts in a plurality of upper and lower stages is often employed (see, for example, Patent Documents 1 and 2).
However, as described above, when the rows of heat transfer tubes are provided in a plurality of upper and lower stages, the vertical height of the entire heat exchanger increases. As a means for solving this problem, it is conceivable to provide a single row of heat transfer tubes in the vertical direction. According to such a configuration, it is possible to reduce the thickness of the entire heat exchanger and reduce the manufacturing cost.

  However, when the heat transfer tube is made to be a single stage as described above, there is a possibility of causing the following problems.

  That is, when the heat exchanger is arranged above the burner and heat recovery is performed from the combustion gas generated by the burner, as an example, first, the lower edge portion of the fin of the heat exchanger is closest to the burner. Because it is a part, it becomes quite hot. On the other hand, the upper edge of the fin is a part where the combustion gas acts after heat recovery by the heat transfer tube, and therefore the temperature is considerably lower than the lower edge of the fin. When the vertical width of the fins is reduced with the single-stage heat transfer tube, the distance from the heat transfer tube to the upper edge of the fin is shortened, but as this distance is shortened, the temperature of the upper edge becomes the temperature of the heat transfer tube. As the temperature approaches, the temperature difference between the upper edge and the lower edge becomes larger. If such a large temperature difference is generated, the difference in thermal expansion between the upper edge portion and the lower edge portion of the fin is also increased, which causes a large thermal stress in the fin. If the heat transfer tubes are provided in multiple upper and lower stages and the fins have a large vertical width, the fin rigidity is high, but if the heat transfer tubes are single-stage and the fins have a small vertical width, the fin rigidity Therefore, deformation due to the thermal stress is likely to occur. When such a phenomenon occurs, the heat transfer tube joined to the fin receives a large load. Moreover, when the fin is joined to the can of the heat exchanger, a large stress is also generated at the joined portion. Therefore, from the viewpoint of enhancing the reliability of the heat exchanger such as durability, it is desired to appropriately prevent the above-described phenomenon.

There is a heat exchanger described in Patent Document 3 as a comparative approximation to the heat exchanger according to the present invention. However, the heat exchanger described in the same document has a structure in which a plurality of U-shaped notches are provided on the upper edge of the fin and heat transfer tubes are inserted into these notches. In such a structure, the upper edge portion of the fin is divided into a plurality of regions by a U-shaped notch, and the fin is not connected in a series from one end to the other end in the lateral width direction. . For this reason, the problem that a big stress generate | occur | produces based on the difference of the thermal expansion amount of the upper edge part of a fin and a lower edge part does not arise easily. However, in the structure shown in the same document, since it is necessary to provide a large number of U-shaped notches in the fin, the heat transfer area of the fin is reduced and the strength of the fin is greatly reduced. . In particular, the fins are easily deformed before being assembled, and the cost of parts management is increased. Furthermore, since the upper surface portion of the heat transfer tube cannot be brought into contact with the fin, the contact heat transfer area between the heat transfer tube and the fin is reduced by that amount, and the bonding strength between the heat transfer tube and the fin is reduced. There is also.

JP 2000-274830 A JP 2005-156033 A JP 2001-165588 A

  The present invention has been conceived under the circumstances as described above, and is suitable for reducing the overall thickness, and appropriately preventing a problem that a large stress is generated in each part due to thermal expansion of the fin. It is an object of the present invention to provide a heat exchanger that can be prevented and a hot water device including 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 has an upper edge portion and a lower edge portion that are connected in series from one end side to the other end side in the lateral width direction, and the upper edge portion and the lower edge portion. One of the edges is an upstream edge located on the upstream side of the heating gas flow direction, and the other is a plate-shaped fin that is the downstream edge, and the fins penetrate in the width direction of the fin. A plurality of straight tube sections, and a row of the plurality of straight tube sections is provided in a single stage in the vertical height direction of the fins, and wherein the plurality of straight tube body portion, the straight tube body portion of the more than half is the arrangement that is biased to the upstream edge nearer the center position in the vertical height direction of the fins, the heat transfer The heat pipe has two straight tube parts connected in series, and two heat pipes located at both ends of the heat transfer pipe. One of the tube-like tube portions is a water inlet side tube portion, and the other is a hot water side tube portion, and the flow of hot water in the heat transfer tube is from the water inlet side tube portion to the hot water side tube. It is set as the structure made | formed in one direction toward a body part, and both the one or both of the said water inlet side pipe body part and the said hot water side pipe body part are the said upstream edge rather than the center position of the up-down height direction of the said fin. It is characterized in that the arrangement is not set to an arrangement biased toward the part .

According to such a configuration, since the rows of the straight tube body portions of the heat transfer tubes are provided in a single upper and lower stage, compared with a configuration in which the rows of straight tube body portions are provided in a plurality of upper and lower stages, In addition to being able to reduce the manufacturing cost, the following effects can also be obtained.
That is, in the present invention, since more than half of the plurality of straight tube portions of the heat transfer tube are located closer to the upstream edge of the fin, from these straight tube portions to the downstream edge of the fin The distance becomes larger. When the distance from the straight tube portion to the downstream edge is increased, the endothermic action of the straight tube portion on the downstream edge is reduced as compared with the case where the heat transfer tube is penetrated to the center height of the fin. Thereby, the temperature of a downstream edge part can be made high. Therefore, it is possible to reduce the temperature difference between the upstream edge and the downstream edge heated to a high temperature by the heating gas, and to reduce the difference in the amount of thermal expansion between these parts. As a result, it is difficult for the fins to generate stress due to the difference in the amount of thermal expansion described above, and it is possible to appropriately prevent or suppress the stress from adversely affecting the heat transfer tubes and other portions.

Furthermore, according to such a configuration, the following effects can be obtained.
That is, the water inlet side pipe part is the pipe part having the lowest temperature among the plurality of straight pipe parts. Therefore, there is a possibility that a drain may be generated on the surface of the water inlet side pipe body portion and its peripheral portion (when, for example, combustion gas is used as a heating means of the heat transfer tube, water vapor in the combustion gas is condensed). . On the other hand, if the water inlet side pipe body part is arranged so as not to be biased toward the upstream side of the heating gas flow direction, the area of the upstream side area of the fin in the vicinity of the water inlet side pipe body part (the area where the temperature is inherently low) is increased. In order to do so, the amount of endotherm increases. Therefore, it is preferable in increasing the heat exchange efficiency. In addition, since the amount of heat absorption increases and the temperature of the water inlet side tube portion and its surroundings increase, the generation of drain can be suppressed.
On the other hand, since the hot water side tubular body portion is the tubular body portion having the highest temperature among the plurality of straight tubular body portions, there is a possibility that the hot water will boil in this portion. On the other hand, if the arrangement of the outlet side pipe body part is not biased toward the upstream side of the heating gas flow direction (placement away from the heating source), the heating amount to the outlet side pipe part is reduced and boiling of hot water is prevented. It becomes possible to do.

  In the present invention, preferably, the distance from the center of each of the more than half of the straight tube sections to the downstream edge of the fin is at least twice the distance from the center to the upstream edge of the fin. It is said that.

  According to such a configuration, the distance between the downstream edge portion of the fin and the straight tube portion is sufficiently large, which is more preferable in obtaining the effect intended by the present invention.

  In the present invention, preferably, a frame-shaped or cylindrical side wall that surrounds the periphery of the fins and the plurality of straight tubular body parts and through which both end portions of the plurality of straight tubular body parts pass, and the side wall A can body having a pair of connecting flanges that protrude in a substantially horizontal direction from both upper and lower end portions and is located on the upstream side and the downstream side in the heating gas flow direction, and outside the can body, the plurality of straight tube body portions A connecting tube portion connecting the end portions, and an auxiliary device for detecting a predetermined physical quantity related to heat exchange between the heat transfer tube and the heating gas or heating for freezing prevention. And the connecting tube portion is arranged so as to be biased toward the upstream connecting flange from the center position in the vertical height direction of the side wall of the can body. Between downstream connection flange The formed first space has a vertical width larger than that of the second space formed between the connecting tube portion and the upstream connecting flange, and is a space for mounting the auxiliary device. It is used as.

According to such a configuration, the following effects can be obtained.
That is, when the entire heat exchanger is made thin by making the heat transfer tubes into a single stage, the width in the vertical direction between the pair of upper and lower connecting flanges provided on the can body of the heat exchanger is small. Become. For this reason, unlike the present invention, for example, if the connecting tube portion of the heat transfer tube is provided at a substantially central height between the pair of upper and lower connecting flanges, the connecting tube portion and each connecting flange The space formed between the two becomes smaller, which makes it difficult to install auxiliary equipment. On the other hand, in the present invention, the above-described problems are eliminated by biasing the position of the connecting tube part from the center position in the height direction of the side wall of the can body, thereby facilitating and optimizing the attachment of auxiliary equipment. be able to.

In the present invention, preferably, as the heat transfer tube, the heat transfer tube includes first and second heat transfer tubes that are housed side by side in a horizontal direction in a can and individually have a water inlet and a water outlet, As the fins, first and second fins corresponding to the first and second heat transfer tubes are provided, and the first and second fins have a gap for inserting a partition member therebetween. Adjacent to form, and the partition member is elastically deformable in response to the deformation when the first and second fins expand or contract with temperature change.

  According to such a configuration, the heat exchanger is a so-called one-can two-circuit system, and two heat exchange operations independent of each other (for example, heat exchange for general hot water supply) while miniaturizing the entire heat exchanger. Operation and heat exchange operation for bath hot water or heating hot water) can be appropriately performed. Further, even if the first and second fins expand or contract with temperature change, the partition member elastically deforms correspondingly, so that the partition member and the first and second fins are greatly damaged. It is possible not to give.

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 drawing which shows an example of the hot water apparatus provided with the heat exchanger (primary heat exchanger). 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. It is a principal front schematic sectional drawing of the hot water apparatus shown in FIG. It is a principal part disassembled sectional view which shows the state which attaches a partition member to the primary heat exchanger shown in FIG. It is a top sectional view showing the secondary heat exchanger of the hot water device shown in FIG. It is a schematic front sectional view showing an example of a hot water equipment according to the present invention. It is a schematic front sectional view showing another example of a hot water system.

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

1 to 7, warm water device, and it illustrates an example of a configuration related thereto.
As clearly shown in FIG. 1, the hot water device WH1 of the present embodiment includes a burner 5, a primary heat exchanger HE1, a secondary heat exchanger HE2, and an outer case 90 surrounding them. This hot water device WH1 can independently perform two systems of hot water supply, general hot water supply and bath hot water supply or heating hot water supply. The primary heat exchanger HE1 and the secondary heat exchanger HE2 are: Both are one-can two-circuit systems.

The primary heat exchanger HE1 is one of the can body 6, a structure in which first and second heat transfer tubes T1, T2 in plan view serpentine is accommodated. The secondary heat exchanger HE2 has a configuration in which a plurality of third and fourth heat transfer tubes T3 and T4 formed in a spiral shape are accommodated in one case 7, and is included in the heat exchanger according to the present invention. Is not equivalent.

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 burner 5 has first and second combustion regions A1 and A2 that can individually control the combustion operation of the fuel. Upper regions of the first and second combustion regions A1 and A2 are partitioned by a partition member 52, and the combustion gas generated in each of the first and second combustion regions A1 and A2 is transmitted to the first and second transmission regions. It progresses individually toward the heat tubes T1 and T2. The partition member 52 is made of a material having excellent heat resistance, and a temperature sensor S1 for detecting an abnormally high temperature is accommodated therein. The abnormally high temperature detection using the temperature sensor S1 is performed by a controller (not shown). When an abnormally high temperature is detected, for example, the drive of the burner 5 is stopped and a notification operation to that effect is performed.

  The primary heat exchanger HE1 is for recovering sensible heat from the combustion gas, and a plurality of fins 2A (the first referred to in the present invention) are placed in a copper can 6 placed on the burner case 50. The first heat transfer tube T1 to which the first heat transfer tube T1 is attached and the second heat transfer tube T2 to which the plurality of fins 2B (corresponding to one example of the second fin in the present invention) are attached are accommodated. It has a configuration. The first and second heat transfer tubes T1 and T2 and the fins 2A and 2B are also made of copper like the can 6.

  The can body 6 has a substantially rectangular frame shape or cylindrical shape in plan view having side walls 60a to 60d standing up and down, and a pair of upper and lower sides projecting outward in the horizontal direction at both upper and lower ends of the side walls 60a to 60d. Connection flanges 61a and 61b are provided. These connecting flanges 61a and 61b are parts for connecting the lower part of the secondary heat exchanger HE2 and the upper part of the burner case 50.

  As shown in FIG. 4, the first heat transfer tube T1 has a meandering in a plan view in which a plurality of straight tube portions 11a penetrating the fins 2A are connected in series via a substantially U-shaped connecting tube portion 12a. Is. More specifically, the plurality of straight tubular body portions 11a are in a horizontal posture, and are arranged in parallel in a row in the width direction of the can body 6 (left-right direction in the figure) and penetrate the fins 2A. doing. Further, both end portions of the plurality of straight tubular body portions 11a penetrate the side walls 60a and 60b of the can body 6 and are joined to the side walls 60a and 60b by means such as brazing. The ends of the straight tube portions 11a adjacent to each other are connected to each other via a connecting tube portion 12a. The second heat transfer tube T2 has a plurality of straight tube portions 11b and connecting tube portions 12b that penetrate the fins 2B, and, like the first heat transfer tube T1, they meander in plan view. Connected to each other and supported by the side walls 60a and 60b. The first and second heat transfer tubes T1 and T2 are adjacent to each other in the width direction of the can body 6 so that a plurality of straight tube portions 11a and 11b are arranged in a line, and are simply arranged in the vertical height direction. It is provided in a stage (one stage).

  As shown well in FIG. 5, the fin 2 </ b> A has a thin plate shape extending in the width direction of the can body 6, and has a plurality of holes 20 a through which the straight tubular body portion 11 a is inserted. ing. Each hole portion 20a is not formed by cutting out the upper edge portion 21a or the lower edge portion 22a. The upper edge portion 21a and the lower edge portion 22a extend from one end side to the other end side in the lateral width direction of the fin 2A. It is connected to a series. The lower edge portion 22a is formed in a wave shape, and the distance from the straight tube portion 11b to each portion of the lower edge portion 22a is made uniform. On the other hand, the corrugation is not achieved for the upper edge portion 21a. In the drawing, the upper edge portion 21a is linear, but it is needless to say that some unevenness may be provided. The basic form of the fin 2B is the same as that of the fin 2A. The fin 2B has a plurality of holes 20b through which the straight tube portion 11b is inserted. The upper edge 21b and the lower edge 22b have a lateral width. It is connected in series from one end side to the other end side in the direction. In the present embodiment, since the combustion gas generated by the burner 5 proceeds from below the fins 2A and 2B, the lower edges 22a and 22b correspond to the upstream edge referred to in the present invention. The edge portions 21a and 21b correspond to the downstream edge portion in the present invention.

  The plurality of straight tube portions 11a and 11b are provided at positions that are lower than the center of the fins 2A and 2B in the height direction, that is, at positions deviated toward the lower edge portions 22a and 22b. Preferably, the distance L1 from the center of the straight tube portions 11a and 11b to the upper edge portions 21a and 21b (the uppermost end portion thereof) is the center of the straight tube portions 11a and 11b and the lower edge portions 22a and 22b ( Is at least twice as long as the distance L2 to the lowermost end portion of.

  As shown in FIGS. 2 and 3, the connecting tube portions 12 a and 12 b are provided at a height that is offset downward from the center of the can body 6 in the vertical height direction. As a result, the vertical width L3 of the first space Sa formed between the connecting tube portions 12a and 12b and the upper connecting flange 61a is equal to the lower connecting flange 61b and the connecting tube portion. It is considerably larger than the vertical width L4 of the second space Sb formed between 12a and 12b. The first space Sa is used as a space for attaching the auxiliary device 4. The auxiliary device 4 is a heater for preventing freezing, for example. However, instead of or in addition to this, for example, a temperature sensor for detecting the temperature of hot water in the heat transfer tubes T1 and T2 or the temperature of the can 6 can be applied. Further, the auxiliary device 4 may be a sensor for detecting a physical quantity other than temperature.

  As shown in FIG. 5, one end portions of the fins 2 </ b> A and 2 </ b> B are joined to the side walls 60 c and 60 d of the can 6 using a means such as brazing. On the other hand, as clearly shown in FIG. 6, a gap 68 is formed between the other end portions of the fins 2A and 2B. In this gap 68, the partition member 3 for partitioning the fins 2A and 2B is inserted and mounted. For example, the partition member 3 is formed by bending a metal plate having excellent heat resistance into a U-shaped cross section or a similar form, and one side edge portion (lower side edge portion in the drawing) is connected to each other, and It has a pair of plate-shaped part 30 which mutually opposes through a clearance gap. The pair of plate-like portions 30 can be bent and deformed with a spring property, whereby the thickness of the partition member 3 can be changed. The partition member 3 is inserted and held in the gap 68 in a compressed state so that the thickness is slightly reduced.

  As shown in FIG. 4, the water inlets 15a and 15b of the first and second heat transfer tubes T1 and T2 are connected to the straight tube portions 11a and 11b located closest to the side walls 60c and 60d of the can body 6, respectively. The joint pipes 12a 'and 12b' are connected to each other. Of course, without using such joint pipes 12a 'and 12b', the one end openings of the upper pipe parts 11a and 11b that are closest to the side walls 60c and 60d can be used as they are. This also applies to the next outlets 16a and 16b. The hot water outlets 16 a and 16 b are one end openings of the straight tubular body portions 11 a and 11 b that are located closest to the partition member 3. With such a configuration, in the first and second heat transfer tubes T1 and T2, the hot water supplied to the water inlets 15a and 15b meanders from the portion near the both ends in the width direction of the can 6 toward the center. While flowing, it reaches the outlets 16a and 16b.

  In FIG. 1, the secondary heat exchanger HE2 is for recovering latent heat from the combustion gas that has passed through the primary heat exchanger HE1, and is placed in a case 7 mounted on the primary heat exchanger HE1. The plurality of third and fourth heat transfer tubes T3 and T4 are accommodated and the space between them is partitioned via a partition plate 74. The third and fourth heat transfer tubes T3, T4 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. As shown in FIG. 7, the plurality of third heat transfer tubes T <b> 3 are formed as spiral tubes having different sizes, and are arranged in an overlapping manner, and their upper and lower ends are arranged outside the case 7. Is connected to headers 75a and 75b for passing water. The plurality of fourth heat transfer tubes T4 are also similar in basic form to the third heat transfer tube T3, and are formed as spiral tubes arranged in an overlapping manner, and at both upper and lower ends thereof, The headers 75c and 75d for water flow are connected.

  The case 7 of the secondary heat exchanger HE2 has air supply ports 71a and 71b in the bottom wall portion 70a, and an exhaust port 72 in the front wall portion 70b. As shown in FIG. 2, the combustion gas that has passed through the location where the first heat transfer tube T1 of the primary heat exchanger HE1 is provided proceeds into the case 7 from the air supply port 71a, and the third heat transfer tube T3. After passing between the gaps, the gas is discharged from the exhaust port 72 to the outside. Further, as shown in FIG. 3, the combustion gas that has passed through the location where the second heat transfer tube T2 of the primary heat exchanger HE1 is provided travels into the case 7 from the air supply port 71b, and the fourth heat transfer. After passing through the gap between the heat pipes T4, it is discharged to the outside from the exhaust port 72. In such a process, latent heat is recovered from the combustion gas by the third and fourth heat transfer tubes T3 and T4. The strongly acidic drain generated by the latent heat recovery flows down from the third and fourth heat transfer tubes T3 and T4 onto the bottom wall portion 70a of the case 7 and then passes through a drain discharge port (not shown). 7 is discharged to the outside.

  As shown in FIG. 1, external water inlets 90 a and 90 b to which water supply pipes 80 a and 80 b are connected and external hot water outlets 92 a and 92 b to which hot water discharge pipes 81 a and 81 b are connected to the bottom or side of the outer case 90. Is provided. The hot water supplied to the external water inlet 90a is supplied to the header 75b via the piping part 92a, thereby circulating in the third heat transfer tube T3 of the secondary heat exchanger HE2. Thereafter, the hot water is sent to the water inlet 15a of the primary heat exchanger HE1 through the header 75a and the piping portion 93a, and passes through the first heat transfer tube T1. The hot water that has passed through the first heat transfer tube T1 and has reached the hot water outlet 16a then reaches the external hot water outlet 92a through the piping portion 94a. The first and third heat transfer tubes T1 and T3 are for general hot water supply, and the hot water that has reached the external hot water outlet 92a is supplied to, for example, a kitchen or a washroom.

  On the other hand, the hot water supplied to the external water inlet 90b is supplied to the header 75d via the piping part 92b, thereby circulating in the fourth heat transfer pipe T4 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 portion 93b, and passes through the second heat transfer tube T2. The hot water that has passed through the second heat transfer tube T2 and has reached the hot water outlet 16b then reaches the external hot water outlet 91b via the piping portion 94b. The second and fourth heat transfer tubes T2 and T4 are for bath hot water supply or heating hot water supply, and the hot water reaching the external hot water outlet 91b is supplied to a location corresponding to such an application.

  Next, the effect | action of above described hot water apparatus WH1 is demonstrated.

  First, the first and second heat transfer tubes T1 and T2 of the primary heat exchanger HE1 have a configuration in which a plurality of straight tube portions 11a and 11b are provided in a single stage (one stage) in the vertical direction. . For this reason, compared with the case where the straight tube parts 11a and 11b are provided in a plurality of upper and lower stages, the primary heat exchanger HE1 is made thinner, the entire hot water device WH1 is downsized, and the manufacturing cost is reduced. Can do.

Since the lower edge portions 22 a and 22 b of the fins 2 </ b> A and 2 </ b> B are close to the burner 5, the temperature is considerably high when the burner 5 is driven to burn. On the other hand, the upper edge portions 21a and 21b of the fins 2A and 2B are portions on which the combustion gas acts after the heat recovery by the straight tube portions 11a and 11b. The temperature of the portion is considerably lower than that of the lower edge portions 22a and 22b. However, in the present embodiment, the straight tube portions 11a and 11b are located closer to the lower edge portions 22a and 22b, and the distance L1 from the straight tube portions 11a and 11b to the upper edge portions 21a and 21b is large. For this reason, the endothermic action of the straight tube portions 11a and 11b with respect to the upper edge portions 21a and 21b is low, and the temperature of the upper edge portions 21a and 21b can be increased. For this reason, the temperature difference between the lower edge portions 22a and 22b and the upper edge portions 21a and 21b is reduced, and it is difficult for the fins 2A and 2B to have a large difference in the amount of thermal expansion when the fins 2A and 2B thermally expand. It becomes possible to do. As a result, the stress generated in the fins 2A and 2B due to such a difference in the amount of thermal expansion is reduced, and the straight tubular body portions 11a and 11b are formed in the fins 2A.
, 2B, the load received can be reduced. In addition, it is possible to avoid the occurrence of a large load at the joint between the fins 2A and 2B and the side walls 60c and 60d of the can body 6.

  When the fins 2A and 2B expand and contract with temperature change, the partition member 3 is elastically deformed correspondingly, and the thickness dimension thereof changes. For this reason, a stress relaxation function can be obtained, damage to the partition member 3 can be prevented, and it is possible to more appropriately prevent a large stress from being generated in the fins 2A and 2B. Moreover, even if the width of the gap 68 formed between the fins 2A and 2B slightly changes, the partition member 3 can be stably attached to the gap 68.

  In the present embodiment, as described with reference to FIG. 2 and FIG. 3, since the connecting pipe body portions 12 a and 12 b are biased toward the lower portion of the can body 6, the overall vertical width of the can body 6. Is compared with the vertical width L3 of the first space Sa formed between the connecting flange 61a on the upper side of the can body 6 and the connecting pipe body portions 12a and 12b. It is possible to take large. For this reason, it is also possible to attach the auxiliary device 4 having a relatively large size using the first space Sa. Moreover, the workability of attaching the auxiliary device 4 is also good.

  Furthermore, according to the present embodiment, the water entering the first and second heat transfer tubes T1, T2 is performed at positions close to the side walls 60c, 60d of the can body 6. For this reason, the temperature rise of the side walls 60c and 60d is suppressed, and it is more appropriately prevented that a large stress is generated at the joint portion between the side walls 60c and 60d and the fins 2A and 2B. Further, if a drain is generated in the primary heat exchanger HE1, the drain is first generated in a region near the side walls 60c and 60d of the can body 6, and then the drain generating region gradually expands toward the partition member 3. Will go. Therefore, even if the drain is generated in the gap between the fins 2A or the gap between the fins 2B and these gaps are clogged, such clogging is unlikely to occur in the region near the partition member 3. . As a result, the combustion gas is almost always maintained in the vicinity of the vicinity of the partition members 3 and 52, and the temperature sensor S1 can appropriately detect the temperature.

Figure 8 shows an implementation form of the present invention. FIG. 9 shows another example of the hot water device. In these drawings, elements that are the same as or similar to those in the above-described embodiment are denoted by the same reference numerals as those in the above-described embodiment, and description thereof is omitted.

  In the hot water device WH2 shown in FIG. 8, among the plurality of straight tube portions 11a of the heat transfer tube T1, the water inlet side tube portion 11a ′ closest to the water inlet 15a and the left end closest to the hot water outlet 16a. The hot water side tubular body portion 11a "is not set to be disposed below the center position of the vertical height of the fin 2A. In this embodiment, the incoming water side and outgoing hot water side tube portions 11a ', 11a" The other straight tubular body portions 11a are arranged so as to be biased toward the lower edge portions of the fins 2A. The dimensions L5 and L6 from the center of the inlet and outlet tube portions 11a 'and 11a "to the upper edge portion 21a and the lower edge portion 22a of the fin 2A have a relationship of L5≤L6. The heights of the side and tapping side tube parts 11a ′ and 11a ″ are the same, but these heights may be different. In addition, the burner 5 has a flame hole portion for forming a flame having an elongated rectangular shape in a plan view extending in the same direction as the straight tube portions 11a and 11b.

  According to this embodiment, the following operation is obtained.

First, since the inflow side pipe part 11a 'is a part that receives unheated hot water supply, the temperature is the lowest among the plurality of straight pipe parts 11a, and the heat absorption effect is essentially the highest. It can be said that it is an area. On the other hand, if the inflow side tube portion 11a ′ is arranged so as not to be biased toward the lower edge portion 22a of the fin 2A, the region near the lower edge portion 22a of the fin 2A in the vicinity of the inflow side tube portion 11a ′ ( The area of the region having a high endothermic effect) is increased, and the amount of heat absorption can be increased. Therefore, it is preferable for increasing the heat exchange efficiency. Further, if the water inlet side tube portion 11a ′ and its peripheral portion are kept at a low temperature, there is a risk that a drain may be generated in the peripheral portion. Therefore, an effect of making it difficult for the drain to be generated can be obtained.

  Next, the hot water side tubular body portion 11a "will be described. The hot water flowing in the hot water side tubular body portion 11a" passes through the plurality of hot water side tubular body portions 11a "and is therefore at a high temperature. There is a risk that the hot water will boil in the hot water side pipe body 11a ". On the other hand, in this embodiment, the hot water side pipe body part 11a "is not arranged near the lower edge part 22a of the fin 2A, and the hot water side pipe body part 11a" is arranged away from the burner 5. Therefore, it is possible to reduce the amount of heating of the hot water side tubular body portion 11a "by the combustion gas, and to suitably prevent boiling of the hot water.

  In the hot water apparatus WH3 shown in FIG. 9, the primary heat exchanger HE1 and the secondary heat exchanger HE2 are not configured in a single can / two circuit, but are configured to have a hot water supply function of only one system. ing. The present invention can also be configured as a hot water apparatus having such a configuration.

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

  As can be understood from the embodiment shown in FIG. 8, in the present invention, not all of the plurality of straight tubular body portions are necessarily arranged in the upstream side in the heating gas flow direction. The straight tubular portion of the portion may be configured not to be biased upstream in the heating gas flow direction. The effect intended by the present invention can be obtained if at least half or more of the straight tube portions are biased to the upstream side in the heating gas flow direction.

  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. In this case, the upper edge portion of the fin corresponds to the upstream edge portion in the present invention, and the lower edge portion corresponds to the downstream edge portion. Therefore, in this case, the straight tube body portion of the heat transfer tube is arranged so as to be biased toward the upper edge portion of the fin.

  As for the fins of the heat exchanger according to the present invention, like the fins of other general heat exchangers, in order to increase the degree of contact with the heating gas and improve the heat exchange efficiency, the cut-raised portion and the burring process It is possible to appropriately adopt means such as forming a hole. Although the heat exchanger according to the present invention is suitable for sensible heat recovery, there is no need to distinguish between sensible heat recovery and latent heat recovery. For this reason, of the pair of connection flanges of the heat exchanger, for example, the connection flange closer to the upper edge is used for connection to the secondary heat exchanger, and other exhaust manifolds and the like are used. It may be connected to a device or member. The heating gas referred to in the present invention is not limited to the combustion gas generated using a burner, and high-temperature exhaust gas discharged from, for example, a fuel cell or a gas engine can also be used. 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.

WH1 to WH3 water heater HE1 primary heat exchanger (heat exchanger according to the present invention)
HE2 Secondary heat exchanger T1 First heat transfer tube T2 Second heat transfer tube Sa, Sb First and second spaces 2A, 2B Fins (first and second fins)
3 Partition member 4 Auxiliary device 6 Can body 11a, 11b Straight tube body portion 11a 'Inlet side tube body portion 11a "Outlet side tube body portions 21a, 21b Upper edge portions 22a, 22b Lower edge portions 60a-60b Side walls (can bodies of)
61a, 61b Flange for connection (can body)

Claims (5)

Each has an upper edge and a lower edge connected in series from one end side to the other end side in the lateral width direction, and one of the upper edge portion and the lower edge portion is located upstream of the heating gas flow direction. A plate-like fin that is an upstream edge and the other is a downstream edge;
It has a plurality of straight tube sections that penetrate through the fins and are arranged in the width direction of the fins, and a row of the plurality of straight tube sections is provided in a single step in the vertical height direction of the fins. A heat transfer tube, and
Of the plurality of straight tube portions, more than half of the straight tube portions are arranged closer to the upstream edge than the center position in the vertical height direction of the fins ,
In the heat transfer tube, the plurality of straight tube portions are connected in series, and one of the two straight tube portions located at both ends of the heat transfer tube is a water inlet tube portion, and the other Is the outlet side pipe body part, and the circulation of the hot water in the heat transfer pipe is configured to be made in one direction from the incoming water side pipe part toward the outlet side pipe part,
A configuration in which both or one of the water inlet side pipe part and the hot water outlet side pipe part is not set to be arranged closer to the upstream edge than the center position in the vertical height direction of the fins. A heat exchanger. The heat exchanger according to claim 1,
The distance from the center of each of the more than half of the straight tube sections to the downstream edge of the fin is at least twice the distance from the center to the upstream edge of the fin. vessel. The heat exchanger according to claim 1 or 2 ,
A frame-like or cylindrical side wall that surrounds the fins and the plurality of straight tubular body parts and through which both ends of the plurality of straight tubular body parts penetrate, and a substantially horizontal direction from both upper and lower end parts of the side walls A can body that has a pair of connecting flanges that project to the upstream side and downstream side of the heating gas flow direction,
A connecting tube portion connecting the ends of the plurality of straight tube portions outside the can, and
Auxiliary equipment for detecting a predetermined physical quantity related to heat exchange processing between the heat transfer tube and the heating gas or heating for freezing prevention,
Further comprising
The connecting tube part is arranged closer to the connecting flange on the upstream side than the center position in the vertical height direction of the side wall of the can, whereby the connecting tube part and the downstream part are arranged. The first space formed between the connecting flange on the side and the vertical space is made larger than the second space formed between the connecting tube portion and the upstream connecting flange. The heat exchanger is used as a space for mounting the auxiliary device . The heat exchanger according to any one of claims 1 to 3,
As the heat transfer pipe, the first and second heat transfer pipes, which are housed side by side in a horizontal direction in a single can and have a water inlet and a water outlet, respectively, are used as the fins. Comprising first and second fins corresponding to the second heat transfer tubes;
The first and second fins are adjacent to each other so as to form a gap for inserting the partition member therebetween, and the partition member is configured such that the first and second fins change in temperature. A heat exchanger that is elastically deformable in response to this deformation when expanded or contracted . A hot water apparatus comprising the heat exchanger according to any one of claims 1 to 4 .

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