JP2005274043A - Heat source device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat source device capable of sufficiently recovering a latent heat held by a combustion gas while adopting a multipipe heat exchanger manufacturable at rather low cost as a heat exchanging means for latent heat recovery. <P>SOLUTION: This heat source device 1 is of a two-can and two-water type having can bodies 2 and 3. A latent heat recovery means 15 comprising secondary heat exchangers 12 and 13 mainly for recovering the latent heat held by the combustion gas is disposed on the downstream side of primary heat exchangers 5 and 6. The secondary heat exchangers 12 and 13 are of multipipe types in which a large number of heat receiving pipes 25 are disposed between headers 27 and 28, and stacked in the flow direction of the combustion gas. The heat receiving pipes 25 of the secondary heat exchangers 12 and 13 are disposed so as to cover the roughly entire part of the cross sectional areas of the combustion gas flow passages 16 and 17 of the can bodies 2 and 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a heat source device, and more particularly to a device including a plurality of heating systems.

Conventionally, a heat source device having a plurality of functions such as a hot water supply function and a hot water replenishment function for a bathtub has been widely used. Many of this type of heat source device has a configuration including a plurality of heat exchange circuits like a heat source device employing a so-called two-can two-water channel format shown in Patent Document 1 below.
JP 2003-4227 A

On the other hand, a heat source device that burns gas or liquid fuel is often used as a heat source for a water heater or a bath device. In recent years, from the viewpoint of energy saving and environmental protection, a heat source device having higher energy efficiency than the conventional heat source device is desired. Therefore, in order to solve such a demand, a heat source device provided with a plurality of heat exchangers and a heat source device called a latent heat recovery type heat source device capable of recovering latent heat in addition to sensible heat of combustion gas are provided. The prior art latent heat recovery type heat source device has a configuration as disclosed in, for example, Patent Document 2 below, and mainly includes a sensible heat recovery heat exchanger that recovers sensible heat of combustion gas, and mainly latent heat. And a latent heat recovery heat exchanger that recovers (recovers the remaining sensible heat). The latent heat recovery type heat source device has higher thermal efficiency than the conventional heat source device.
JP-A-11-148642

  As described above, many of the widely used heat source devices are equipped with a plurality of heat exchange circuits like the two-can two-water channel type heat source device disclosed in Patent Document 1, and such a configuration. It is also desired that the heat source device of this type adopts a configuration in which a heat exchanger for recovering latent heat is employed in order to effectively use energy.

  The heat source device including the heat exchanger for recovering latent heat as disclosed in Patent Document 2 has high thermal efficiency. On the other hand, since the latent heat recovery type heat source device recovers even the latent heat of the combustion gas, a large amount of drain generated by the liquefaction of water vapor adheres to the latent heat recovery heat exchanger. This drain is a liquid that is exposed to combustion gas, contains an acidic component, and is corrosive. Therefore, the latent heat recovery heat exchanger employed in the prior art latent heat recovery heat source device is made of an expensive material having high corrosion resistance.

  In addition, since the latent heat recovery type heat source device has a configuration including both a sensible heat recovery heat exchanger and a latent heat recovery heat exchanger, the configuration of the device tends to increase in size. Therefore, an expensive heat exchanger such as a plate fin heat exchanger or the like is employed in the conventional heat source device for recovering latent heat. As described above, the latent heat recovery type heat source device of the prior art has a problem that the manufacturing cost of the entire heat source device is increased because the heat exchanger for recovering latent heat is expensive.

  Therefore, in order to solve such a problem, the present inventors independently configured two systems of sensible heat recovery heat exchange circuits 101a and 101b and two systems of latent heat recovery heat exchange means 102a and 102b as shown in FIG. A two-can two-water channel type heat source device 100 employing a multi-tube heat exchanger having a large number of heat receiving tubes in the heat exchange means 102a, 102b for recovering latent heat was experimentally prepared. The heat exchanging means 102 a is disposed so as to cover only the cross-sectional area of the combustion gas flow path 105 of one can body 103. The heat exchanging means 102b is independent of the heat exchanging means 102a, and is arranged so as to cover only the cross-sectional area of the combustion gas flow path 107 of the other can body 106.

  As described above, a combustion experiment was performed on the heat source apparatus 100 employing the multi-tube heat exchanger such as the heat exchange means 102a and 102b for recovering latent heat. As a result, it has been found that in order to obtain a heat exchange efficiency comparable to that when a plate fin heat exchanger is employed, it is necessary to arrange a large number of heat receiving tubes. That is, as described above, when a multi-tube heat exchanger is used for latent heat recovery, in order to increase the heat exchange efficiency, a large number of heat receiving tubes are arranged to improve the contact area between the combustion gas and the heat receiving tube. It is necessary to let Therefore, when a configuration such as the heat source device 100 is adopted, it is necessary to braze a large number of heat receiving tubes to the header, and the heat exchanger can be downsized as compared with the case where a plate fin heat exchanger or the like is adopted. There is a problem that it is difficult and the manufacturing cost cannot be reduced so much.

  Then, this invention aims at provision of the heat-source apparatus which was excellent in thermal energy efficiency, employ | adopting the multi-tube heat exchanger with comparatively low manufacturing cost as a heat exchange means.

  The invention according to claim 1, which is provided to solve the above-mentioned problem, includes a plurality of heating systems provided with a combustion means and a combustion gas passage through which combustion gas generated in the combustion means flows. There is provided heat exchange means for heating hot water by heat exchange with the combustion gas, and the heat exchange means comprises a heat exchange circuit constituted by a multi-tube heat exchanger having a large number of heat receiving tubes. The heat source device is characterized in that the heat receiving pipe is disposed so as to straddle a cross-sectional area of the plurality of heating systems.

  In the heat source device of the present invention, the heat receiving tubes constituting the heat exchanging means are arranged so as to straddle the cross-sectional areas of the plurality of heating systems, and the length of the heat receiving tubes is long. Therefore, the heat source device of the present invention requires a small number of heat receiving tubes required to secure a heat transfer area for heat exchange with the combustion gas. Therefore, according to the present invention, it is possible to provide a heat source device with high energy recovery efficiency that can sufficiently recover the thermal energy of the combustion gas while minimizing the labor and cost involved in producing the heat exchange means. it can.

  Further, the heat exchanging means employed in the heat source device of the present invention has a compact configuration because the number of heat receiving tubes relative to the contact area between the combustion gas and the heat receiving tubes can be reduced. Therefore, according to this invention, size reduction of the heat-source apparatus provided with the heat exchange means can be achieved.

  According to a second aspect of the present invention, the heat exchange circuit has a storage means for storing the heat receiving pipe, and the storage means includes a gas inlet for introducing combustion gas, and a combustion gas in the storage means. A gas discharge port for discharging the gas to the outside is provided, and a flow path from the gas inlet to the gas outlet increases the flow resistance of the combustion gas in the direction from the gas inlet to the gas outlet. The heat source apparatus according to claim 1, wherein a resistance means is provided.

  In the heat source device of the present invention, since the resistance means for increasing the flow resistance of the combustion gas is provided in the flow path from the gas inlet to the gas outlet, the residence time of the combustion gas introduced into the storage means is long. Therefore, the combustion gas introduced into the heat exchange means comes into contact with substantially the entire range of each heat receiving pipe constituting the heat exchange circuit, and is exhausted after sufficient heat exchange. Therefore, according to the present invention, it is possible to provide a heat source device having a compact heat exchange circuit and excellent energy efficiency capable of sufficiently recovering the thermal energy of the combustion gas.

  As described above, in the heat source device of the present invention, since substantially the entire range of each heat receiving tube constituting the heat exchanging means and the combustion gas are in contact with each other, the heat energy can be sufficiently recovered even if the number of heat receiving tubes is small. Therefore, the heat source device of the present invention has a small number of heat receiving tubes constituting the heat exchange means. Therefore, according to the present invention, the labor required for brazing the heat receiving pipe is omitted, the manufacturing cost of the heat exchange means is minimized, the heat exchange means is made compact, and the entire heat source device is further enhanced. Can be downsized.

  The invention according to claim 3 is the heat source apparatus according to claim 2, wherein the resistance means has a parallel surface arranged substantially parallel to the gas inlet.

  According to this configuration, the combustion gas introduced from the gas inlet can be diffused into the storage means. Therefore, according to the above-described configuration, the heat transfer area of the heat receiving tube can be effectively used, and the heat exchange means can be configured to be compact.

  Further, the heat source device of the present invention has a high heat recovery efficiency for each heat receiving tube constituting the heat exchanging means, so that the number of heat receiving tubes required for recovering the thermal energy can be reduced. Therefore, according to the present invention, it is possible to provide a heat source device that saves the labor required for brazing the heat receiving tube, minimizes the manufacturing cost of the heat exchange means, and requires a small space for installing the heat exchange means. .

  The heat source device according to any one of claims 1 to 3 may be characterized in that the heat exchanging means includes a plurality of heat exchanging circuits. (Claim 4)

  According to such a configuration, it is possible to provide a heat source device with high heat recovery efficiency that can sufficiently recover the thermal energy of the combustion gas generated by combustion and can be effectively used for heating hot water or a heat medium.

  According to a fifth aspect of the present invention, in the heat source device according to any one of the first to fourth aspects, the heat exchanging means has a configuration in which a plurality of heat exchanging circuits are juxtaposed in the flow direction of the combustion gas. is there.

  According to such a configuration, the heat released in one of the adjacent heat exchange circuits can be recovered in the other heat exchange means. Therefore, the heat source device of the present invention has high heat recovery efficiency.

  According to a sixth aspect of the present invention, the heat exchanging means has at least a first heat exchanging circuit and a second heat exchanging circuit, and the first heat exchanging circuit supplies hot water or a heat medium. The second heat exchange circuit is connected to a first heat medium supply channel that is assumed to be for a long time, and the supply time of hot water or the heat medium is supplied by the first heat medium supply channel. Is connected to a second heat medium supply circuit that is assumed to be shorter than the second heat exchange circuit, and the first heat exchange circuit is disposed upstream of the second heat exchange circuit in the flow direction of the combustion gas. The heat source device according to claim 1, wherein the heat source device is a heat source device.

  In the heat source device of the present invention, the heat exchange means has first and second heat exchange circuits. Here, the first heat medium supply flow path connected to the first heat exchange circuit has more hot water or heat medium than the second heat medium supply flow path connected to the second heat exchange circuit. The supply time is assumed to be long. For this reason, in the heat source device of the present invention, the heat released from the first heat exchange circuit tends to be relatively large.

  In the heat source device of the present invention, the first heat exchange circuit with a relatively large amount of generated heat is disposed upstream of the second heat exchange circuit in the flow direction of the combustion gas. For this reason, in the heat source device of the present invention, the released heat generated in the first heat exchange circuit is propagated to the second heat exchange circuit side and recovered, and is effectively used for heating hot water or a heat medium. Therefore, the heat source device of the present invention has high heat recovery efficiency.

  According to a seventh aspect of the present invention, the heat exchange circuit has a storage means for storing the heat receiving pipe, a gas inlet for introducing combustion gas discharged from the heat exchange means side into the storage means, and the storage means A gas discharge port for discharging the combustion gas in the inside to the outside, and the gas discharge port is formed in a discharge port forming region assumed on a predetermined configuration surface of the storage means. The exhaust port forming region is covered with an exhaust member, and a gas inflow space into which the combustion gas discharged from the gas exhaust port flows is formed between the exhaust member and the exhaust port forming region. The heat source device according to claim 1, wherein the heat source device is a heat source device.

  The heat source device of the present invention is a gas inflow space in which the combustion gas discharged from the plurality of gas discharge ports of the heat exchange means is formed between the exhaust port forming region where the gas discharge ports are formed and the exhaust member. It is configured to be discharged after flowing in. Therefore, the combustion gas discharged from each gas discharge port spreads in the gas inflow space and is discharged in a state where the discharge speed is reduced. Therefore, according to the present invention, a heat source device with low exhaust noise can be provided.

  The invention according to claim 8 is characterized in that the one or a plurality of heating systems mainly recover the sensible heat recovery heat exchange means for recovering the sensible heat of the combustion gas generated mainly in the combustion means in the middle of the combustion gas flow path. A latent heat recovery heat exchange means for recovering the latent heat of the combustion gas, and either one or both of the sensible heat recovery heat exchange means and the latent heat recovery heat exchange means are constituted by a multi-tube heat exchanger. The heat source device according to claim 1, wherein the heat source device is configured by a heat exchange circuit.

  As described above, each of the heat source devices according to claims 1 to 7 includes a compact heat exchange means constituted by a multi-tube heat exchanger, and the manufacturing cost of the heat exchange means is low. The heat source device of the present invention includes sensible heat recovery heat exchange means and latent heat recovery heat exchange means, at least one of which is constituted by the above-described multi-tube heat exchanger. Therefore, the heat source device of the present invention has a compact device configuration and extremely high heat energy recovery efficiency.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing cost is low and can provide the heat source apparatus which can obtain sufficient heat exchange efficiency.

  Next, a heat source device according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is an operation principle diagram of the heat source device of the present embodiment. 2A is an exploded perspective view showing a secondary heat exchanger for recovering latent heat employed in the heat source apparatus shown in FIG. 1, and FIG. 2B is a perspective view of the secondary heat exchanger. FIG. 3 is an exploded perspective view showing the vicinity of the secondary heat exchanger of the heat source device shown in FIG. 4 (a) is an exploded perspective view schematically showing the flow of combustion gas in the heat exchange means for latent heat recovery employed in the heat source device shown in FIG. 1, and FIG. 4 (b) is the latent heat. It is a disassembled perspective view of the heat exchange means for collection | recovery and an exhaust member. Moreover, FIG.4 (c) is AA sectional drawing of the same (b). FIG. 5 is a cross-sectional view showing a modification of the secondary heat exchanger shown in FIG. For convenience of explanation, the case member of the latent heat recovery heat exchanger is omitted in FIG. 2A, and the heat receiving pipe is not shown in FIG. 2B.

  In FIG. 1, reference numeral 1 denotes a heat source apparatus according to this embodiment. The heat source device 1 is a so-called two-can two-water type heat source device, and primary heat exchangers 5 and 6 (sensible heat recovery type heat which mainly recover sensible heat of combustion gas in each of the independent can bodies 2 and 3. Exchange circuit), combustion burners 7 and 8, and blowing means 10 and 11 are provided. Further, on the downstream side (upper side in FIG. 1) of the primary heat exchangers 5 and 6, secondary heat exchangers 12 and 13 for recovering latent heat mainly recovering latent heat from the combustion gas (latent heat recovery heat exchange circuit). Latent heat recovery means 15 is arranged.

  The primary heat exchangers 5 and 6 are so-called fin-and-tube heat exchangers whose main parts are made of copper. The primary heat exchangers 5 and 6 are disposed in the combustion gas passages 16 and 17 through which high-temperature combustion gas generated in the combustion burners 7 and 8 flows. The primary heat exchangers 5 and 6 mainly function as the sensible heat recovery means 4 for recovering the sensible heat of the combustion gas, and heat the hot water flowing inside. The primary heat exchangers 5 and 6 occupy the entire cross-sectional areas X and Y of the combustion gas passages 16 and 17, respectively.

  The primary heat exchangers 5 and 6 include water inlets 18 and 20 and water outlets 21 and 22. The water inlets 18 and 20 are connected to the water outlets 31 and 31 side of the secondary heat exchangers 12 and 13. Hot water that has undergone heat exchange in the secondary heat exchangers 12 and 13 flows into the primary heat exchangers 5 and 6 and is further heated.

  The primary heat exchanger 5 exchanges heat with the combustion gas flowing in the combustion gas flow path 16 of the can body 2 in which the combustion burner 7 having a relatively large combustion capacity is arranged. A hot water supply pipe 23b (second heat medium supply flow path) that is assumed to be intermittently supplied with hot water such as 23a is connected. Moreover, the primary heat exchanger 6 arrange | positioned in the can 3 performs heat exchange with the combustion gas which generate | occur | produces in the combustion burner 8 with a comparatively small combustion capability. The outlet 22 of the primary heat exchanger 6 is connected to an outward flow path 24b (first heat medium supply flow path) that supplies hot water to a load terminal that is expected to be used continuously such as the heating terminal 24a. .

  As shown in FIG. 2, the secondary heat exchangers 12 and 13 are located at both ends of the case member 26, and a large number of heat receiving tubes 25 are connected to headers 27 and 28 arranged in parallel by brazing. is there. The heat receiving pipes 25 are metal cylinders, and are arranged in parallel with a gap that allows the combustion gas to pass therethrough. The header 27 is provided with a water inlet 30 for introducing hot water from the outside and a water outlet 31 for discharging hot water from each heat receiving pipe 25 to the outside. A water supply pipe 23 c for supplying hot water from the outside is connected to the water inlet 30 provided in the header 27 of the secondary heat exchanger 12. Moreover, the return flow path 24c which returns hot water from the heating terminal 24a is connected to the water inlet 30 at the secondary heat exchanger 13 side. Hot water flowing in from the water inlets 30, 30 of the secondary heat exchangers 12, 13 flows through the heat receiving pipe 25, is heated, and is discharged from the water outlets 31, 31.

  The case member 26 is a member formed by bending a belt-shaped metal plate into a box shape as shown in FIGS. The case member 26 is configured such that a discharge port 33 is provided on the front surface 32 and an introduction port 36 is provided on a back surface 35 facing the front surface 32. The inlet 36 is for introducing the combustion gas that has passed through the primary heat exchangers 5 and 6 into the secondary heat exchangers 12 and 13. The combustion gas introduced from the introduction port 36 passes through the gaps between the many heat receiving pipes 25 that traverse the inside of the case member 26, and exchanges heat with the hot water in the heat receiving pipe 25. The combustion gas that has exchanged heat with the hot water in the heat receiving pipe 25 is discharged from the outlet 33 to the outside of the secondary heat exchangers 12 and 13.

  As shown in FIG. 2, a deflection member 37 having a parallel surface 38 extending in a direction along the heat receiving pipe 25 (substantially parallel direction in the present embodiment) is provided inside the case member 26. The deflection member 37 is disposed at a position that intersects with the straight line L when a straight line L connecting the discharge port 33 and the introduction port 36 is assumed. That is, the secondary heat exchangers 12 and 13 are configured such that the discharge port 33 and the introduction port 36 of the case member 26 are shielded by the deflection member 37, and the parallel surface 38 is connected to the introduction port 36 and the discharge port 33. They are arranged in parallel.

  The deflection member 37 functions as a resistance unit that increases the flow resistance of the combustion gas in the direction from the inlet 36 toward the outlet 33. Further, the deflecting member 37 also functions as a dispersion unit that disperses the combustion gas introduced from the gas introduction port in the storage unit. Therefore, the combustion gas introduced into the case member 26 from the introduction port 36 bypasses the inside of the case member 26, spreads to every corner in the case member 26, flows to the discharge port 33 side, and the surface of each heat receiving pipe 25. Heat exchange in contact with the whole. Accordingly, the combustion gas that has flowed into the secondary heat exchangers 12 and 13 is exhausted after substantially all of the latent heat is recovered in each heat receiving pipe 25.

  As shown in FIGS. 1, 3, and 4, the secondary heat exchangers 12 and 13 are stacked in the flow direction of the combustion gas flowing in the combustion gas passages 16 and 17 of the can bodies 2 and 3, respectively. The heat receiving pipe 25 is arranged so as to straddle the cross-sectional area of the heating system A on the can body 2 side and the heating system B on the can body 3 side. Further, the secondary heat exchangers 12 and 13 are arranged so as to cover regions corresponding to the cross-sectional regions X and Y occupied by the primary heat exchangers 5 and 6 via connection devices 40 and 41. Therefore, the secondary heat exchangers 12 and 13 are more heat-receiving pipes 25 than the case where the secondary heat exchangers 102a and 103a are provided independently for the cans 103 and 105 as in the heat source device 100 of FIG. Is long. Therefore, the secondary heat exchangers 12 and 13 have a small number of heat receiving pipes 25 required to secure a heat transfer area required to obtain sufficient heat exchange efficiency, and the apparatus configuration is compact. In addition, there are few brazing points for the headers 27 and 28 of the heat receiving pipe 25.

  Moreover, the secondary heat exchanger 12 for heating the hot water supplied to the heating terminal 24a assumed to supply hot water continuously is supplied to the hot water tap 23a assumed to be intermittent in the supply of hot water. It arrange | positions rather than the secondary heat exchanger 13 for heating the hot and cold water to be performed in the upstream (lower side in the state of FIG. 1) of a combustion gas flow path. In other words, the secondary heat exchanger 12 that is assumed to generate heat continuously is arranged upstream of the secondary heat exchanger 13 that is assumed to generate less heat. ing. Therefore, the emitted heat generated in the secondary heat exchanger 12 propagates to the secondary heat exchanger 13 side and is efficiently recovered.

  The secondary heat exchangers 12 and 13 are connected via connecting members 40 and 41 as shown in FIGS. 1 and 3. As shown in FIG. 3, the connecting devices 40, 41 are connected to the collecting portions 43, 45 connected to the opening portions of the can bodies 2, 3 and the connecting portions 46, 47, so Is forming. The connecting portions 46 and 47 are in surface contact with the back surface 35 side of the case member 26 of the secondary heat exchangers 12 and 13, respectively. The height of the connecting portion 47 is the same as the height h of the secondary heat exchanger 12, and the height of the connecting portions 46 and 47 is equal to the height H of the stacked secondary heat exchangers 12 and 13. In the secondary heat exchangers 12 and 13, as shown in FIG. 3, the back surfaces 35 and 35 are in surface contact with the connection portion 46 in a state of being stacked up and down, and the bottom surface of the secondary heat exchanger 12 is on the collecting portions 43 and 45. It is arranged so as to be in surface contact.

  The collecting portions 43 and 45 have openings 43a and 45a for introducing combustion gas flowing through the combustion gas flow paths 16 and 17 of the can bodies 2 and 3, respectively. Further, the connection portions 46 and 47 are provided with discharge openings 48 and 50 for discharging combustion gas. As described above, the discharge openings 48 and 50 are at positions corresponding to the inlets 36 and 36 of the secondary heat exchangers 12 and 13 stacked on the collecting portions 43 and 45, respectively, and are connected in an airtight state.

  An exhaust member 55 is mounted on the front side of the secondary heat exchangers 12 and 13 as shown in FIG. The exhaust member 55 includes a bulging portion 56 and a flange portion 57. In the bulging portion 56, four exhaust openings 58 are formed. The exhaust member 55 is attached such that the flange portion 57 is in surface contact with the front surface 32 of the secondary heat exchangers 12 and 13. Further, in the secondary heat exchangers 12 and 13, both the discharge ports 33 and 33 are in the exhaust port formation region 60 hatched in FIG. 4B, and the exhaust member 55 is in the exhaust port formation region 60. It is attached so that the bulging part 56 may cover. Thereby, as shown in FIG. 4C, a gas inflow space 61 is formed between the exhaust port formation region 60 and the bulging portion 56.

  Next, the flow of combustion gas in the heat source device 1 of the present embodiment will be described in detail with reference to the drawings. The heat source device 1 includes a can body 2 provided with a combustion burner 7 for heating hot water in a bathtub, and a can body 3 provided with a combustion burner 8 for heating hot water discharged from the hot water tap 23a. Are independent. The combustion gas generated in the combustion burner 7 passes through the primary heat exchanger 5 disposed in the combustion gas flow path 16 on the can body 2 side, and heats the hot water in the primary heat exchanger 5. The combustion gas from which sensible heat has been mainly recovered in the primary heat exchanger 5 reaches the connecting member 40 disposed on the most downstream side of the combustion gas passage 16.

  The combustion gas that has passed through the primary heat exchanger 5 gathers at the gathering portion 43 of the connecting member 40, flows from the discharge opening 48 of the connecting portion 46 through the inlet 36, and flows into the secondary heat exchanger 12. The flow direction of the combustion gas flowing into the secondary heat exchanger 12 is deflected in a direction along the heat receiving pipe 25 by a deflecting member 37 disposed at a position facing the inlet 36 as indicated by an arrow in FIG. . Thereafter, the combustion gas strikes the wall surface on the header 27 side, the flow direction is deflected again, and the combustion gas flows to the discharge port 33 side. Therefore, the combustion gas that has flowed into the case member 26 of the secondary heat exchanger 12 has a long residence time in the case member 26, spreads over the entire internal space, and is discharged after being in surface contact with the entire surface of each heat receiving pipe 25. The

  On the other hand, the combustion gas generated by the operation of the combustion burner 8 to heat the hot water for hot water supply flows through the combustion gas passage 17 downstream, that is, upward in FIG. 1, and reaches the primary heat exchanger 6. . Most of the sensible heat is recovered from the combustion gas flowing in the combustion gas flow path 17 by heat exchange with hot water flowing in the primary heat exchanger 6. Thereafter, the combustion gas flows into the collecting portion 45 of the connection device 41 on the downstream side (upper side) of the primary heat exchanger 6.

  The combustion gas that has flowed into the collecting portion 45 flows through the connection portion 47 and rises to the discharge opening 50 of the secondary heat exchanger 13. Thereafter, the combustion gas is introduced into the secondary heat exchanger 13 through the inlet 36 that communicates with the discharge opening 50. The combustion gas that has flowed into the secondary heat exchanger 13 is deflected in the flow direction by the deflecting member 37, flows in a zigzag manner in the case member 26, and is diffused throughout the interior space of the case member 26. Meanwhile, the combustion gas is in surface contact with the entire surface of the heat receiving pipe 25 constituting the secondary heat exchanger 13 and exchanges heat with the low-temperature hot water introduced into the heat receiving pipe 25 from the outside, and the latent heat is recovered. The Thereafter, the combustion gas reaches the discharge port 33 on the front surface 32 side of the secondary heat exchanger 13 and is discharged to the outside of the case member 26.

  As described above, the combustion gas flowing through the secondary heat exchanger 12 or the secondary heat exchanger 13 and flowing out of the case members 26 and 26 from the discharge ports 33 and 33 is expanded at the bulging portion 56 of the exhaust member 55. And flows into a gas inflow space 61 formed between the exhaust gas forming space 60 and the exhaust port forming region 60 of the latent heat recovery means 15 and then discharged to the outside through the opening 58.

  As described above, in the heat source device 1 of the present embodiment, the heat receiving pipe 25 constituting the latent heat recovery means 15 covers the combustion gas flow paths 16 and 17 of the can bodies 2 and 3 and covers the cans. The heat receiving pipe 25 also crosses the portion corresponding to the gap between the bodies 2 and 3. Therefore, as compared with the case where the latent heat recovery heat exchanging means 102a and 102b are arranged so as to cover only one of the combustion gas flow paths 105 and 107 of the can bodies 103 and 106, respectively, as in the heat source device 100 shown in FIG. The length of the heat receiving pipe 25 is long.

  Further, the secondary heat exchangers 12 and 13 constituting the latent heat recovery means 15 employed in the heat source device 1 have a deflection member 37 in the case member 26 in order to promote contact between the combustion gas and the heat receiving pipe 25. The combustion gas is bypassed and diffused throughout the case member 26. Therefore, in the heat source device 1, the combustion gas stays in the case member 26 of the secondary heat exchangers 12 and 13 for a long period of time, and is exhausted after heat exchange is performed on substantially the entire surface of the heat receiving pipe 25. Therefore, the heat source device 1 can sufficiently recover the latent heat of the combustion gas even if the number of the heat receiving tubes 25 is smaller than that in the case where the heat source device 100 is configured.

  In addition, since the heat source device 1 of the present embodiment can sufficiently recover latent heat even if the number of the heat receiving tubes 25 is small, the secondary heat exchangers 12 and 13 can have a compact configuration. Therefore, according to the configuration described above, the space required for installing the latent heat recovery means 15 is small, and the small heat source device 1 can be provided.

  Since the heat source device 1 of the present embodiment has a configuration in which the secondary heat exchangers 12 and 13 are stacked, the emitted heat generated in one of these is propagated to the other and recovered. Further, in the heat source device 1, the secondary heat exchanger 12 for heating hot water supplied to the heating terminal 24a is lower than the secondary heat exchanger 13 for supplying hot water to the hot water tap 23a, that is, combustion. It is set as the structure arrange | positioned in the gas flow direction upstream. That is, in the heat source device 1, heat exchange is continuously performed and heat exchange is performed intermittently in the secondary heat exchanger 12 on the heating side, which is assumed to generate a large amount of emitted heat. It is the structure arrange | positioned in the upstream (lower side) rather than the secondary heat exchanger 13 by the side of the hot water supply assumed that there are few generation | occurrence | production amounts. Therefore, the heat source device 1 can sufficiently recover the heat generated in the secondary heat exchangers 12 and 13, and the heat recovery efficiency is high.

  In the heat source device 1, after the combustion gas flowing out from the discharge ports 33 and 33 of the secondary heat exchangers 12 and 13 flows into the gas inflow space 61 and expands, it is discharged from the opening 58 to the outside. Therefore, the combustion gas discharged from the opening 58 has a slow flow rate and generates almost no exhaust noise.

  Further, in the heat source device 1, the discharge ports 33 and 33 of the secondary heat exchangers 12 and 13 are gathered in the exhaust port formation region 60 and both are covered by the exhaust member 55. The appearance is orderly and superior in aesthetics compared to the case where it is distributed apart.

  The deflecting member 37 is preferably arranged so as to block the straight line L connecting the inlet 36 and the outlet 33 formed in the case member 26 as in the above embodiment, but is arranged at a position different from this. It may be. In addition, instead of providing the deflecting member 37, the heat source apparatus 1 forms a region where the flow resistance of the combustion gas is high by densely arranging a part of the heat receiving pipes 25 as shown in FIG. The means 65 may be used. Also with this configuration, the combustion gas introduced into the secondary heat exchangers 12 and 13 can be deflected in a predetermined direction, and the residence time and flow path length of the combustion gas can be extended. It is possible to spread the combustion gas as much as possible. Therefore, the heat source device 1 can use the entire surface of each heat receiving pipe 25 as a heat transfer surface, and the heat exchange efficiency is high.

  In addition, the heat source device 1 has a configuration in which, for example, as shown in FIG. 5B, a material that diffuses the flow of combustion gas, such as the net member 70 or punching metal, is arranged in the vicinity of the inlet 36 or inside the case member 26. Also good. According to such a configuration, the combustion gas can be diffused throughout the case member 26 and the residence time of the combustion gas can be extended, and the entire surface of the heat receiving pipe 25 traversing the inside of the case member 26 is heated with the combustion gas and the heat. It can function effectively as a heat transfer surface to be exchanged.

  The heat source device 1 of the present embodiment includes a heating system that supplies hot water to the hot-water tap 23a and a heating system that supplies hot water to the heating terminal 24a, but the present invention is limited to this. Instead, for example, instead of a heating system for heating hot water supplied to the heating terminal 24a, a heating system for heating hot water in a bathtub (not shown) is provided, or such a heating system is provided separately. Also good. Even when a heating system for heating hot water supplied to the bathtub is provided, a secondary heat exchanger for heating hot water to be supplied to a terminal that is assumed to be used frequently is used as a combustion gas. It is desirable to arrange it upstream in the flow direction.

  The heat source device 1 of the above embodiment includes the multi-tube type secondary heat exchangers 12 and 13 as a heat exchanger for latent heat recovery, but the present invention is not limited to this, For example, it is good also as a structure which employ | adopted the multi-tube type heat exchanger which has the structure similar to the secondary heat exchangers 12 and 13 as the primary heat exchangers 5 and 6. FIG. Further, the heat source device 1 described above includes primary heat exchangers 5 and 6 that mainly recover sensible heat of the combustion gas, and secondary heat exchangers 12 and 13 that mainly recover the latent heat of the combustion gas. Although this was a so-called latent heat recovery type heat source device, the present invention is not limited to this, and a multi-tube type heat having the same configuration as the secondary heat exchangers 12 and 13 as the primary heat exchangers 5 and 6. A heat source apparatus of a type that employs an exchanger and does not include the secondary heat exchangers 12 and 13 may be used.

It is an operation principle figure of the heat source device of one embodiment of the present invention. (A) is a disassembled perspective view which shows the secondary heat exchanger for latent heat recovery employ | adopted in the heat-source apparatus shown in FIG. 1, (b) is a perspective view which shows a secondary heat exchanger. It is a disassembled perspective view which shows the secondary heat exchanger vicinity of the heat-source apparatus shown in FIG. (A) is the conceptual diagram which showed typically the flow of the combustion gas in the heat exchange means for latent heat collection | recovery employ | adopted as the heat source apparatus shown in FIG. 1, (b) is the said heat exchange means for latent heat collection | recovery, and The exploded perspective view of an exhaust member, (c) is AA sectional drawing of (b). (A) is sectional drawing which shows the modification of the secondary heat exchanger shown in FIG. 2, (b) is a perspective view which shows another modification. It is an operation | movement principle figure of the heat source apparatus of a prior art.

Explanation of symbols

1 Heat source device 4 Sensible heat recovery means 5, 6 Primary heat exchanger 7, 8 Combustion burner 12, 13 Secondary heat exchanger 15 Latent heat recovery means 23b Hot water supply pipe (second heat medium supply flow path)
24b Outward flow path (first heat medium supply flow path)
25 heat receiving pipe 26 case member 33 discharge port 37 deflection member 55 exhaust member 60 exhaust port formation region 61 gas inflow space 65 deflection unit

Claims (8)

  A plurality of heating systems each having a combustion means and a combustion gas passage through which combustion gas generated in the combustion means flows are arranged side by side, and a heat exchange means for heating hot water by heat exchange with the combustion gas is provided. The heat exchange means includes a heat exchange circuit configured by a multi-tube heat exchanger having a large number of heat receiving tubes, and the heat receiving tubes straddle a cross-sectional area of the plurality of heating systems. It is arrange | positioned in the heat source apparatus characterized by the above-mentioned.   The heat exchange circuit has storage means for storing the heat receiving pipe, and the storage means is provided with a gas introduction port for introducing combustion gas and a gas discharge port for discharging the combustion gas in the storage means to the outside. The flow path from the gas inlet to the gas outlet is provided with resistance means for increasing the flow resistance of the combustion gas in the direction from the gas inlet to the gas outlet. The heat source device according to claim 1.   The heat source device according to claim 2, wherein the resistance means has a parallel surface arranged substantially parallel to the gas inlet.   The heat source device according to any one of claims 1 to 3, wherein the heat exchanging means includes a plurality of heat exchanging circuits.   The heat source device according to any one of claims 1 to 4, wherein the heat exchange means has a configuration in which a plurality of heat exchange circuits are juxtaposed in the flow direction of the combustion gas.   The heat exchange means includes at least a first heat exchange circuit and a second heat exchange circuit, and the first heat exchange circuit is assumed to be supplied with hot water or a heat medium for a long time. It is assumed that the supply time of hot water or the heat medium is shorter than the supply time by the first heat medium supply flow path. The first heat exchange circuit is disposed upstream of the second heat exchange circuit in the flow direction of the combustion gas. The heat source device according to any one of 1 to 5.   The heat exchange circuit has a storage means for storing the heat receiving pipe. The storage means has a gas introduction port for introducing the combustion gas discharged from the heat exchange means side, and the combustion gas in the storage means to the outside. A gas discharge port for discharging, and the gas discharge port is formed in a discharge port forming region assumed on a predetermined configuration surface of the storage means, and the exhaust port forming region is A gas inflow space into which the combustion gas discharged from the gas discharge port flows is formed between the exhaust member and the exhaust port formation region. Item 7. The heat source device according to any one of Items 1 to 6.   One or a plurality of heating systems include a sensible heat recovery heat exchanging means for recovering sensible heat of combustion gas generated mainly in the combustion means in the middle of the combustion gas flow path, and a latent heat recovery for recovering mainly latent heat of the combustion gas. Heat exchange means, and one or both of the sensible heat recovery heat exchange means and the latent heat recovery heat exchange means are constituted by a heat exchange circuit constituted by a multi-tube heat exchanger. The heat source device according to claim 1, wherein the heat source device is a heat source device.

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