JP2007046794A - Water heating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To further enhance heat exchange efficiency by preventing combustion gas from passing convergently through partial clearances of coil-like tube parts by a simple means. <P>SOLUTION: This water heating apparatus A comprises a burner 1 supplying combustion gas into a space part 3 surrounded by the coil-like tube parts 40 of heat exchange water tubes 4 from one end side thereof, and a combustion gas stopper 6 restraining the combustion gas from passing the other end of the space part 3 as it is. A surface, facing the burner 1, of the combustion gas stopper 6 is formed as a recessed surface part 62 with its center part recessed from an outer peripheral edge part, and combustion gas supplied into the space part 3 from the burner 1 advances through a center side region of the space part 3 and is reflected by the recessed surface part 62 to become a circulating flow returned into a position on the burner 1 side after passing through the outer peripheral edge side of the space part 3. In a process of returning the combustion gas to the burner 1 side, a part of the combustion gas passes through the clearances 31 of the coil-like tube parts 40. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a hot water apparatus such as a hot water supply apparatus that generates hot water by recovering heat from combustion gas.

  Conventional examples of this type of hot water apparatus include those described in Patent Documents 1 and 2. The hot water apparatus described in these documents includes a combustor and a heat exchanger having a water pipe for recovering heat from the combustion gas generated by the combustor, and the water pipe is a coiled pipe. Has a body part. In this hot water apparatus, when combustion gas is supplied from the opening at one end to the space surrounded by the coiled tube part, the combustion gas is formed in the coiled tube part. Pass through multiple gaps. During this passage, heat exchange is performed between the combustion gas and the water in the coiled tubular portion, and hot water is generated. A flat-plate-like combustion gas stopper is provided at the other end opening of the space portion, and the combustion gas supplied to the space portion is prevented from flowing out from the other end opening portion to the outside of the space portion as it is. Has been.

  According to such a configuration, the coiled tube portion of the heat exchanger can be formed by forming the tube in a spiral shape, and the structure uses, for example, a large number of finned tubes. Compared to the type of heat exchanger, it is quite simple. Therefore, it is suitable for reducing the manufacturing cost of the entire hot water device and for reducing the size.

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

  That is, in the prior art, when the combustion gas is supplied to the space surrounded by the coiled tubular body, the combustion gas subsequently collides with the flat combustion gas stopper, and on the outer peripheral edge of the combustion gas stopper. It has come to spread toward. For this reason, most of the combustion gas will intensively pass through the gap in the vicinity of the combustion gas stopper among the plurality of gaps formed in the coiled tube portion, and the gap away from the combustion gas stopper The amount of combustion gas passing through is very small. If the deviation of the combustion gas passage amount occurs, it cannot be said that the entire length region of the coiled tube portion is effectively used for heat exchange. Further, in the prior art, the temperature distribution in the space is also non-uniform. For example, even if the combustion gas passes through a gap away from the combustion gas stopper, the temperature of the combustion gas remains at other parts. It is considerably low compared with the heat recovery amount in the part. For this reason, in the prior art, it cannot be said that the heat exchange efficiency is still sufficient, and there is room for improvement.

Japanese Patent Laid-Open No. 62-288446 Japanese Utility Model Publication No. 61-69676

  The present invention has been conceived under such circumstances, and it is possible to prevent combustion gas from intensively passing through a part of the gap of the coiled tube portion by simple means. Therefore, an object of the present invention is to provide a hot water apparatus capable of improving the heat exchange efficiency as compared with the prior art.

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

  The hot water device provided by the first aspect of the present invention includes a water pipe having a coiled tubular body portion having a plurality of loop portions arranged in a certain direction, and a space portion surrounded by the coiled tubular body portion. A heat exchanger, a combustor that supplies combustion gas from the one end side in the fixed direction into the space portion, and the combustion gas supplied from the combustor to the space portion leaves the other end portion of the space portion as it is. A hot water device comprising a combustion gas stopper provided in the heat exchanger so as to suppress passage and outflowing to the outside of the space portion, and among the combustion gas stoppers, The surface facing the combustor is formed as a concave surface part whose central part is recessed from the outer peripheral edge part, and the combustion gas supplied from the combustor to the space part has a region near the center of the space part. Progress and reflected by the concave surface As a result, the circulation flow returns to the position near the combustor through the vicinity of the outer peripheral edge of the space portion, and in the process of returning the combustion gas toward the combustor, a part of the combustion gas is , And is configured to flow out of the space portion through a gap formed between the plurality of loop portions.

  According to such a configuration, the combustion gas supplied from the combustor to the space portion and colliding with the concave surface portion of the combustion gas stopper passes through the outer peripheral edge of the space portion and is returned to the position near the combustor. Therefore, unlike the prior art, the combustion gas that collides with the combustion gas stopper does not intensively pass through the gap near the combustion gas stopper. According to the present invention, it is possible to appropriately allow combustion gas to pass through a gap near the combustor of the coiled tubular body portion and to uniformize the amount of passage of the combustion gas. Furthermore, since the combustion gas circulates in the space portion, the temperature distribution in the space portion can be made uniform, and the temperature deviation of the combustion gas passing through the gaps of the coiled tube portion can be reduced. Is possible. For this reason, according to the present invention, it is possible to exchange heat effectively using substantially the entire coiled tube portion, and it is possible to increase the heat exchange efficiency as compared with the prior art. Further, when the fuel is burned by the combustor, the lower the combustion temperature, the lower the NOx. However, according to the present invention, the combustion gas that has been reflected by colliding with the combustion gas stopper is separated from the coiled tube portion. Since it is returned to the position close to the combustor while being in contact, it is possible to lower the combustion temperature and reduce NOx.

  In a preferred embodiment of the present invention, it further includes a combustion gas regulating cylindrical portion that is disposed in the space portion and has both end openings facing the combustor and the combustion gas stopper. Combustion gas directed from the position close to the combustor to the combustion gas stopper passes through the inside of the cylindrical portion, and the combustion gas reflected by the combustion gas stopper passes through the outside of the cylindrical portion. It is configured as follows.

  According to such a configuration, the flow path of the combustion gas from the position close to the combustor toward the combustion gas stopper, and the flow path of the combustion gas that is reflected by the combustion gas stopper and returns to the position close to the combustor are described above. It will be accurately divided by the cylindrical part. Therefore, the circulation of the combustion gas is further smoothed, which is more suitable for increasing the heat exchange efficiency.

  The hot water device provided by the second aspect of the present invention has a water pipe provided with a coiled tubular body portion having a plurality of loop portions arranged in a certain direction, and a space portion surrounded by the coiled tubular body portion. A heat exchanger, a combustor for supplying combustion gas into the space from one end in the fixed direction, and the combustion gas supplied from the combustor to the space through the other end of the space And a combustion gas stopper provided in the heat exchanger so as to suppress outflow to the outside of the space portion, wherein both end openings are the combustor and the combustor. A cylindrical portion for combustion gas regulation that is disposed in the space so as to face the combustion gas stopper and divides the space into a region near the center and a region near the outer periphery of the space, The space from the combustor The combustion gas supplied to the gas passes through the inside of the cylindrical part and is reflected by the concave surface part, thereby passing through the outside of the cylindrical part and returning to the position near the combustor. At the same time, in the process of returning the combustion gas toward the combustor, a part of the combustion gas passes through the gaps formed between the plurality of loop portions and flows out of the space portion. It is characterized by being composed.

  According to such a configuration, the combustion gas supplied from the combustor to the space portion passes through the inside of the tubular portion and collides with the combustion gas stopper, and then passes through the outside of the tubular portion and burns. The circulation flow is returned to the position near the vessel. For this reason, similarly to the hot water device provided by the first aspect of the present invention, the combustion gas is appropriately passed through the gap near the combustor of the coiled tubular body portion, and the amount of combustion gas passing is reduced. Uniformity can be achieved. In addition, the combustion gas temperature in the space can be made uniform, and the temperature deviation of the combustion gas passing through the gaps in the coiled tube can be reduced. As a result, it is possible to exchange heat effectively using substantially the entire coiled tube portion, and the heat exchange efficiency can be improved as compared with the prior art. In addition, as described above, the effect of reducing the combustion temperature of the combustor and reducing NOx can be obtained.

  In a preferred embodiment of the present invention, the combustion gas regulating cylindrical portion is configured using a spiral water pipe capable of passing water.

  According to such a configuration, it is possible to recover heat from the combustion gas by using the spiral water pipe constituting the cylindrical portion, which is more preferable for improving the heat exchange efficiency. Since the water pipe provided with the heat recovery function is used as a regulating member for circulating the combustion gas, the configuration is reasonable. Moreover, since the said cylindrical part is cooled by water-flowing, the heat resistance of a cylindrical part is also improved.

  In a preferred embodiment of the present invention, a portion of the coiled tube portion close to the combustion gas stopper has a smaller dimension of the gaps between the plurality of loop portions than a portion far from the combustion gas stopper. Or, the gap is not formed.

  According to such a configuration, the combustion gas is more appropriately prevented or suppressed from passing through the gap near the combustion gas stopper. Therefore, the effect intended by the present invention can be obtained more reliably.

  In a preferred embodiment of the present invention, the combustion gas stopper is arranged in the intermediate portion in the fixed direction of the space portion, so that the space portion is divided into first and second regions in the fixed direction. And the coiled tubular portion is partitioned into first and second heat exchange portions surrounding the first and second regions, and supplied from the combustor to the first region. The combustion gas passes through the gaps between the plurality of loop portions in the first heat exchange portion and flows out of the first heat exchange portion, and then the plurality of loop portions in the second heat exchange portion. It is comprised so that the clearance gap between may be passed further.

  According to such a configuration, the sensible heat is recovered from the combustion gas in the first heat exchanging portion of the coiled tubular body portion, and the latent heat is recovered in the second heat exchanging portion. It is also possible to improve efficiency. When latent heat recovery is performed from the combustion gas, water vapor in the combustion gas is condensed and a drain (condensed water) is generated. According to the configuration described above, the drain is intensively generated in the second heat exchange unit, The drain can be appropriately recovered. Furthermore, according to the said structure, since a coiled tube part is divided | segmented into the 1st and 2nd heat exchange part, and it is made to let a combustion gas pass sequentially to this subdivided part, coil shape Compared with the case where the tube body portion is not subdivided in such a manner, the combustion gas can be more evenly applied to the entire coiled tube body portion, and this also improves the heat exchange efficiency. .

  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.

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

  FIGS. 1-6 has shown the hot water supply apparatus as a specific example of the hot water apparatus with which this invention was applied, and the structure relevant to this. As clearly shown in FIG. 1, the hot water supply apparatus A of this embodiment includes a combustor 1, a heat exchanger B, a bottom casing 80, and an exhaust duct 81.

  The combustor 1 is of a reverse combustion type in which, for example, kerosene is used as fuel and the fuel is sprayed downward and burned. The nozzle 11 at the tip of the lower end of the combustor 1 is tapered, and the mixed gas of the sprayed fuel and combustion air discharged downward from the nozzle 11 and the combustion gas are at an appropriate flow rate. It is designed to flow narrowly. Therefore, the combustor 1 has a so-called gun type burner or a configuration close to this. The combustor 1 is covered and supported by a can body 10 mounted on the heat exchanger B, and fuel is supplied from the outside of the can body 10 through a pipe 12. Yes. A blower fan 13 for feeding combustion air to the combustor 1 and a motor M for driving the blower fan 13 are provided on the upper portion of the can body 10.

  The heat exchanger B includes a can body 2, a plurality of water pipes 4, a pair of headers 5 for incoming and outgoing hot water, a combustion gas stopper 6, and a cylindrical portion 8 for restricting combustion gas. The plurality of water tubes 4 form a tubular body winding structure portion in which a plurality of coiled tubular body portions 40 are arranged in an overlapping manner.

  The can body 2 has a substantially cylindrical peripheral wall portion 20 and a pair of cover bodies 21A and 21B attached to the upper and lower portions of the peripheral wall portion 20, and is placed on the bottom casing 80. . A plurality of brackets 23 are provided on the outer periphery of the lower portion of the peripheral wall portion 20, and fixing to the bottom casing 80 is achieved using these brackets 23. The cover body 21 </ b> A is formed with an opening 22 </ b> A into which the nozzle portion 11 of the combustor 1 enters. Further, the cover body 21 </ b> B is formed with an opening 22 </ b> B for guiding the combustion gas whose heat recovery has been completed using the plurality of water tubes 4 into the bottom casing 80. Each part of the can body 2 is made of stainless steel, for example, and is not easily corroded due to a drain generated when latent heat is recovered from combustion gas using each water pipe 4. When latent heat recovery is performed from combustion gas, water vapor in the combustion gas is condensed and a drain (condensed water) is generated, which is generally oxidized by sulfur oxides or nitrogen oxides in the combustion gas. It becomes a strong acidity of about PH3 that absorbs substances. For this reason, the can 2 is made of a material excellent in acid resistance. This also applies to each water pipe 4 and the like.

  Each of the plurality of water tubes 4 includes a coiled tube portion 40 disposed in the can 2. The heat exchanger B of the present embodiment includes a total of three water tubes 4, and the coiled tube portions 40 are all spiral, and the hollow circular spiral loop portion 40 a has a vertical height. It has a configuration in which a plurality of layers are stacked in the vertical direction. However, the coiled tube portions 40 have different winding diameters and are arranged concentrically or substantially concentrically. In the present embodiment, the pipe diameters of the plurality of water pipes 4 are the same, but the pipe diameters may be different.

  A pair of headers 5 are connected to the upper end and the lower end of each coiled tube portion 40 via a curved tube 41. As shown well in FIG. 4, the bent tube 41 passes through the peripheral wall portion 20 of the can body 2, and its one end portion 41 a is fitted to the end portion 400 of each coiled tube portion 40. Yes. The header 5 has an opening 50 for connecting a tubular body, and is connected to the other end 41 b of the bent pipe 41 by welding or the like. As shown in FIGS. 1 and 2, among the pair of upper and lower headers 5, for example, the lower header 5 is connected to a water supply pipe 99 a that supplies tap water or the like, and the upper header 5 A hot water discharge pipe 99b is connected to supply hot water generated by heating through each coiled tube section 40 to a desired hot water supply destination.

  A space 3 is formed inward of the innermost coiled tube 40. In the present embodiment, the space 3 is a combustion chamber for the combustor 1. A combustion gas passage 32 is formed between the outermost coiled tube portion 40 and the peripheral wall portion 20 of the can body 2. Further, a gap 31 for passing a combustion gas is formed between each of the loop portions 40a adjacent to each other in the vertical direction of the plurality of coiled tubular body portions 40 to allow the space portion 3 and the combustion gas passage 32 to communicate with each other. Each gap 31 is formed by using a plurality of spacers 7 as shown in FIG. More specifically, as shown in FIG. 6, the spacer 7 is cut and raised at a plurality of locations on, for example, a stainless steel long rectangular flat base 70, so that the plurality of protrusions 71 are comb-like. It has the structure arranged in line. The plurality of projecting portions 71 are inserted between the loop portions 40 a of each coiled tubular body portion 40, so that a gap 31 is formed, and the height of the gap 31 is the same as the thickness of the projecting portion 71. It is specified in the dimensions. As shown in FIG. 4, in this heat exchanger B, for example, three spacers 7 are arranged at substantially equal angular intervals. In addition, as means for forming the gap 31 at a desired height, for example, means for forming convex portions or concave portions on the outer surface of the plurality of loop portions 40a can be used instead of the means using the spacers. When the upper and lower adjacent loop portions 40a are brought into contact with each other via a convex portion, a portion other than the convex portion becomes the gap 31. Further, when a concave portion is formed on the outer surface of the loop portion 40 a and the outer surfaces are brought into contact with each other, the concave portion becomes the gap 31.

  The combustion gas stopper 6 is provided so as to partition the space 3 into first and second regions 30a and 30b in the vertical direction. The plurality of coiled tube sections 40 are divided by the combustion gas stopper 6 into first and second heat exchange sections HT1 and HT2 that surround the first and second regions 30a and 30b, respectively. As will be described later, in this hot water supply apparatus A, the combustion gas in the first region 30a of the space 3 passes through the gap 31 of the first heat exchange part HT1 and flows into the combustion gas passage 32, and then the second The heat exchange part HT2 passes through the gap 31 and flows into the second region 30b. 2 and 3, the annular wall 220 forming the opening 22A of the cover body 21A is in contact with the upper part of the innermost coiled tube section 40, and the combustion gas is first. The first region 30a is prevented from passing between them and flowing directly into the combustion gas passage 32. Further, as indicated by reference numeral n2, the annular wall 221 forming the opening 22B of the cover body 21A is in contact with the lower part of the innermost coiled tube section 40, so that the combustion gas flows from the combustion gas passage 32. Passing between them is prevented from flowing directly into the second region 30b.

  The upper surface of the combustion gas stopper 6 is a concave portion 62 that faces the combustor 1. The concave surface portion 62 is preferably formed in a shape having an inclined surface 62 a that is inclined such that the recess of the concave surface portion 62 becomes deeper as the whole or a part thereof becomes closer to the center of the combustion gas stopper 6. Such an inclined surface 62a is particularly effective for reflecting upward the combustion gas that has traveled toward the concave surface portion 62 from above.

  The combustion gas stopper 6 has a configuration in which a heat insulating material 60b excellent in fire resistance and heat resistance is laminated on an upper surface of a base portion 60a made of, for example, stainless steel formed in a concave dish shape. The heat insulating material 60b is, for example, ceramic. A flange 61 is formed on the outer periphery of the combustion gas stopper 6. As shown in FIG. 5, the flange piece 61 is provided so that the outer peripheral surface of the base portion 60 a is substantially one round or more than one round, and has a spiral shape in which a step H <b> 1 is generated at both ends thereof. The combustion gas stopper 6 is attached by the helical flange 61 being screwed into the plurality of coiled tube portions 40. Since the coiled tubular part 40 is spiral, the collar piece 61 can be appropriately screwed into the gap between the coiled tubular part 40. However, the means for attaching the combustion gas stopper 6 is not limited to this, and for example, a structure in which the combustion gas stopper 6 is supported on the water pipe 4 or the can body 2 using a dedicated support member may be used.

  Like the combustion gas stopper 6, the combustion gas restricting cylindrical portion 8 is entirely or partially made of ceramic having excellent fire resistance and heat resistance, and has a cylindrical shape with both upper and lower ends opened. It is. The cylindrical portion 8 is located at an intermediate portion between the combustor 1 and the combustion gas stopper 6, and substantially the entire amount of combustion gas or sprayed fuel mixed air ejected from the nozzle portion 11 of the combustor 1 is in this cylindrical shape. It is provided so as to enter the inside of the part 8. Between the upper end of this cylindrical part 8 and the nozzle part 11 of the combustor 1 and between the lower end of this cylindrical part 8 and the concave surface part 62 of the combustion gas stopper 6, a gap through which combustion gas can pass is provided. Is formed. Although not shown in the drawing, the cylindrical portion 8 is attached by, for example, supporting the combustion gas stopper 6 via an appropriate stay. Of course, instead of such a configuration, the nozzle unit 11 of the combustor 1 can be suspended and supported using an appropriate member. Since the cylindrical portion 8 is provided in the first region 30 a of the space portion 3, a part of the first region 30 a is a region near the center of the space portion 3 that is inside the cylindrical portion 8. And a region near the outer peripheral edge of the space 3 that is the outside.

  Of the bottom portion of the can body 2, a space portion between the lower portion of the peripheral wall portion 20 and the annular wall 221 of the cover body 21 </ b> B receives a drain receiving portion 26 for receiving a drain dripping from the water pipe 4 along with latent heat recovery. It has become. The drain receiving portion 26 is provided with a drain outlet 26b to which a pipe 82 is connected as means for discharging the received drain to the outside of the can 2.

  The bottom casing 80 has a substantially rectangular parallelepiped box shape with a hollow inside, and the heat exchanger B and the exhaust duct 81 are placed on the bottom casing 80 so as to be aligned. The combustion gas that has passed downward in the can 20 of the heat exchanger B flows into the bottom casing 80 from the opening 80a, and then upwards from the other opening 80b to the bottom opening of the exhaust duct 81. Is going to progress. The combustion gas flowing into the exhaust duct 81 is then discharged to the outside as exhaust gas from the exhaust port 81a. The exhaust duct 81 includes, for example, a sound absorbing material (not shown) such as glass wool, and serves as a silencer for reducing exhaust sound.

  Next, the operation of the hot water supply apparatus A will be described.

  First, when the combustor 1 is driven, a downward combustion gas flow is generated in the cylindrical portion 8, and the combustion gas collides with the concave surface portion 62 of the combustion gas stopper 6. Then, this combustion gas is reflected upward so as to avoid the inside of the cylindrical portion 8, and proceeds upward toward the outer peripheral edge of the first region 30 a of the space portion 3. Next, when the combustion gas reaches the vicinity of the nozzle portion 11 of the combustor 1, combustion air is injected from the nozzle portion 11 into the cylindrical portion 8, so that a part of the combustion gas is Then, it flows again into the cylindrical portion 8. For this reason, in the first region 30 a of the space portion 3, a circulation flow of the combustion gas is generated, and it is appropriate that the combustion gas intensively passes through the gap 31 in the vicinity of the combustion gas stopper 6. To be resolved. In the hot water supply apparatus A, as described above, in the process in which the combustion gas is circulated, the combustion gas is dispersed and passes through each of the plurality of gaps 31. It is possible to allow the combustion gas of substantially the same amount as that of the other gaps 31 to pass through the gap 31 existing at the upper part of the first heat exchanging part HT1, and to make the amount of passage of the combustion gas through the plurality of gaps 31 uniform Is planned. Further, the temperature distribution in the first region 30a can be made uniform, and the temperature of the combustion gas passing through each gap 31 can be made uniform. As a result, efficient heat recovery can be achieved by the substantially full length region of the first heat exchange part HT1 of the coiled tube part 40, and the heat exchange efficiency is increased.

In addition, since the plurality of coiled tube portions 40 are provided in an overlapping manner, the combustion gas sequentially contacts the plurality of loop portions 40 a arranged in the horizontal direction when passing through the gaps 31. It will be. Therefore, the amount of heat recovered from the combustion gas can be increased by such a thing. The combustion gas that has flowed into the combustion gas passage 32 then travels downward through the combustion gas passage 32, passes through the gap 31 of the second heat exchange section HT2, and flows into the second region 30b. Similarly to the first heat exchanging unit HT1, the second heat exchanging unit HT2 can increase the amount of heat recovered because the plurality of loop portions 40a are arranged in an overlapping manner. In this hot water supply apparatus A, it is possible to collect sensible heat from the combustion gas by the first heat exchanging unit HT1 and to collect latent heat by the second heat exchanging unit HT2, thereby further recovering heat. The amount can be increased. On the other hand, in such a configuration, an acidic drain is generated in the second heat exchanging portion HT2 with the recovery of latent heat. This drain drops after dropping on the drain receiving portion 26 and the drain outlet 26b and It is discharged to the outside through the pipe 82. Therefore, the inside of the bottom casing 80 is appropriately prevented from being contaminated by the acidic drain.

  Furthermore, in this hot water supply apparatus A, the combustion temperature of the fuel by the combustor 1 can be lowered by circulating the combustion gas. For this reason, the effect of reducing NOx can also be obtained.

  7 to 11 show other embodiments of the present invention. In the drawings after FIG. 7, the same or similar elements as those in the above embodiment are denoted by the same reference numerals as those in the above embodiment.

  In the embodiment shown in FIG. 7, the heat exchanger B is not provided with means corresponding to the tubular portion 8 of the previous embodiment. However, the upper surface of the combustion gas stopper 6 is formed as a concave surface portion 62 similar to the previous embodiment.

  In the present embodiment, unlike the previous embodiment, although a part of the space 3 is not divided into a region near the center and a region near the outer peripheral edge by the cylindrical portion 8, the nozzle portion 11 of the combustor 1 is used. When the combustion gas that has traveled downward collides with the concave surface portion 62 of the combustion gas stopper 6, the combustion gas is also reflected so as to travel upward in the region near the outer peripheral edge of the space portion 3. Therefore, similarly to the previous embodiment, the combustion gas is circulated in the first region 30a of the space portion 3 so that the amount of combustion gas passing through the plurality of gaps 31 of the coiled tubular body portion 40 and the temperature thereof are uniform. The heat exchange efficiency can be improved.

  In the embodiment shown in FIG. 8, although the combustion gas regulating cylindrical portion 8 is provided, the upper surface portion of the combustion gas stopper 6 is formed as a flat surface. In the vicinity region L1 of the combustion gas stopper 6, the plurality of loop portions 40a are in contact with each other in the vertical direction so that no gap 31 is formed between them, or the gap 31 is temporarily formed. Even if it is, the dimension is set to be smaller than the other gaps 31.

  In the present embodiment, although the upper surface portion of the combustion gas stopper 6 is not formed as a concave surface portion, the first region 30a of the space portion 3 is provided in the combustor 1 by providing the cylindrical portion 8. Are clearly divided into a region near the center for advancing the combustion gas downward and a region near the outer periphery for advancing the combustion gas reflected by the combustion gas stopper 6 upward. For this reason, compared with the case where the cylindrical part 8 is not provided, it becomes easy to circulate combustion gas in the 1st area | region 30a, and it becomes possible to raise heat exchange efficiency rather than a prior art. In particular, in the present embodiment, the gap 31 is not formed in the vicinity region L1 of the combustion gas stopper 6, or the size of the gap 31 is made smaller than that of the other portions. It is more reliably prevented that the combustion gas of the gas passes through the region L1 and flows out toward the combustion gas passage 32 in a concentrated manner. The region L1 of the coiled tube portion 40 prevents or suppresses the passage of the combustion gas, and also exhibits the effect of guiding the combustion gas traveling to the region L1 upward, so that the combustion in the first region 30a is performed. An effect of promoting gas circulation is also obtained.

  As can be understood from the embodiment shown in FIGS. 7 and 8, in the present invention, a configuration in which the concave portion 62 is formed in the combustion gas stopper 6 without providing the cylindrical portion 8 for restricting the combustion gas, or combustion A configuration in which the cylindrical portion 8 for restricting combustion gas is provided without forming the concave surface portion 62 in the gas stopper 6 can also be adopted. Of the coiled tube portion 40, the configuration in which the gap 31 is not formed in the vicinity region L1 of the combustion gas stopper 6 or the means for reducing the size of the gap 31 is not limited to the embodiment shown in FIG. It can be used in all applicable hot water systems. Note that when the gap 31 in the region L1 is reduced, the dimensions may not be constant. For example, the closer to the combustion gas stopper 6, the smaller the dimension may be.

  In the embodiment shown in FIG. 9, the combustion gas regulating cylindrical portion 8 </ b> A is configured using a water pipe 89. The water pipe 89 has a coiled portion that forms the cylindrical portion 8A, and pipe portions 89a and 89b for incoming and outgoing water that are connected to both ends of the coiled portion.

  According to the present embodiment, by allowing water to flow through the water pipe 89, heat recovery using the water pipe 89 is also possible, which is more preferable for improving the heat exchange efficiency. Further, the water pipe 89 is exposed to a high-temperature flame. However, if water is allowed to pass through the water pipe 89, thermal damage to the water pipe 89 can be prevented. Originally, it is necessary to make the material of the cylindrical portion extremely excellent in fire resistance and heat resistance. However, according to the present embodiment, such necessity can be eliminated. Since the combustion gas stopper 6 is also exposed to a high temperature, the combustion gas stopper 6 can be configured to be water-cooled. As the water cooling means of the combustion gas stopper 6, for example, the inside of the combustion gas stopper 6 may be formed in a hollow shape, and cooling water may be supplied to and discharged from the hollow portion.

  In the embodiment shown in FIG. 10, the combustion gas stopper 6 is provided so as to close the lower opening of the space portion 3 surrounded by the plurality of coiled tube portions 40. Therefore, unlike the above-mentioned embodiment, the space part 3 is not divided into the first and second regions, and the plurality of coiled tube parts 40 are the first and second heat exchange parts. Is not classified.

  In the present embodiment, when the combustion gas supplied from the combustor 1 to the space portion 3 passes through the plurality of gaps 31 of the plurality of coiled tube portions 40 and flows into the combustion gas passage 32, the combustion gas is thereafter It immediately reaches the opening 22B at the bottom of the can 2 and flows into the bottom casing 80. Since the plurality of coiled tube parts 40 are provided in a lap winding shape, when the combustion gas passes through each gap 31, for example, the sensible heat is recovered by the coiled tube parts 40 closer to the inner periphery. At the same time, the latent heat can be recovered by the coiled tubular portion 40 near the outer periphery. In the space portion 3, the combustion gas is circulated by the action of the concave surface portion 62 of the combustion gas stopper 6 and the action of the cylindrical portion 8, and the combustion gas is circulated to the plurality of gaps 31 of each coiled tubular body 40. Similar to the above-described embodiment, it can be passed through at a uniform amount and temperature.

  In the embodiment shown in FIG. 11, the coiled tube portion 40 of the water tube 4 is configured using a flat tube. According to such a configuration, the gap 31 formed between the flat tubes has an elongated shape in the passage direction of the combustion gas, and the coiled tube portion 40 and the combustion when the combustion gas passes through the gap 31 It is possible to increase the degree of contact with the gas. Therefore, the effect which can improve heat exchange efficiency by the same principle as the case where a plurality of coiled tube parts are provided in the form of lap winding is obtained. However, this invention is not limited to such a structure, For example, it can also be set as the structure provided with only one water pipe which has the coil-shaped pipe part formed using the round pief.

  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 varied in design in various ways.

  In the present invention, when the concave portion is formed in the combustion gas stopper for the purpose of circulating the combustion gas, the effect of smoothly circulating the combustion gas increases as the depth of the concave portion increases, and the concave portion becomes smoother. Forming in a curved shape is also effective for smoothly circulating the combustion gas. However, this invention is not limited to this, The concrete shape, depth, etc. of a concave-surface part can be selected variously.

  As for the cylindrical portion for regulating combustion gas in the present invention, as is understood from an example in which the cylindrical portion is configured using a water pipe in the embodiment shown in FIG. What is necessary is just the cylinder shape which plays the role which divides at least one part of the space part enclosed by the body part into the area | region near the center and the area | region near an outer periphery. The tubular portion is not limited to a cylindrical shape. In the present invention, it is also possible to form the coiled tube portion, for example, in a hollow rectangular shape. In such a case, the cylindrical portion for regulating the combustion gas is formed into a hollow rectangular rectangular tube shape corresponding thereto. It may be formed.

  The combustor is not limited to an oil combustor, and other types of combustors such as a gas combustor can also be used. Further, the combustion method is not limited to the reverse combustion type, and for example, a normal combustion type in which fuel is burned upward can be used. In the case of the positive combustion type, a combustion gas stopper is provided above the combustor, and a concave surface portion is provided on the downward surface of the combustion gas stopper.

  The hot water device according to 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. Includes a device for producing hot water.

It is a schematic sectional drawing which shows the hot water supply apparatus as an example of the hot water apparatus with which this invention was applied. It is principal part sectional drawing of the hot-water supply apparatus shown in FIG. It is principal part sectional drawing of a cross section different from FIG. 2 of the hot water supply apparatus shown in FIG. It is a plane sectional view of the hot water supply device shown in FIG. It is a principal part perspective view of the combustion gas stopper used for the hot-water supply apparatus shown in FIG. It is a principal part perspective view which shows the spacer used for the hot water supply apparatus shown in FIG. It is principal part sectional drawing of the other example of the hot water apparatus to which this invention was applied. It is principal part sectional drawing which shows the other example of the hot water apparatus to which this invention was applied. It is principal part sectional drawing which shows the other example of the hot water apparatus to which this invention was applied. It is a schematic sectional drawing which shows the other example of the hot water apparatus to which this invention was applied. It is principal part sectional drawing which shows the other example of the hot water apparatus to which this invention was applied.

Explanation of symbols

A Hot water supply device (hot water device)
B Heat exchanger 1 Combustor 2 Can body 3 Space part 4 Water pipe 6 Combustion gas stopper 8, 8A Cylindrical part 31 for restricting combustion gas 31 Gap 40 Coiled pipe part 40a Loop part 62 Concave part 31 Gap 32 Combustion gas passage

Claims (6)

A water pipe having a coiled tubular body part having a plurality of loop parts arranged in a certain direction, and a heat exchanger having a space part surrounded by the coiled tubular body part,
A combustor for supplying combustion gas into the space from one end in the fixed direction;
Combustion provided in the heat exchanger so as to suppress the combustion gas supplied from the combustor to the space through the other end of the space and flowing out of the space. A gas stopper,
A hot water device comprising:
Of the combustion gas stopper, the surface facing the combustor is formed as a concave surface portion whose center is recessed from the outer peripheral edge, and the combustion gas supplied from the combustor to the space is Advancing in the region near the center of the space portion and being reflected by the concave surface portion, it becomes a circulating flow that passes near the outer peripheral edge of the space portion and returns to the position near the combustor, and the combustion gas In the process of returning to the vicinity of the combustor, a part of the combustion gas is configured to flow out of the space portion through the gap formed between the plurality of loop portions. A featured hot water device. It further includes a combustion gas regulating cylindrical portion that is disposed in the space portion and has both end openings facing the combustor and the combustion gas stopper,
Combustion gas from the position close to the combustor toward the combustion gas stopper passes through the inside of the cylindrical portion, and combustion gas reflected by the combustion gas stopper passes through the outside of the cylindrical portion. The hot water device according to claim 1, which is configured as follows. A water pipe having a coiled tubular body part having a plurality of loop parts arranged in a certain direction, and a heat exchanger having a space part surrounded by the coiled tubular body part,
A combustor for supplying combustion gas into the space from one end in the fixed direction;
Combustion provided in the heat exchanger so as to suppress the combustion gas supplied from the combustor to the space through the other end of the space and flowing out of the space. A gas stopper,
A hot water device comprising:
For controlling combustion gas, which is disposed in the space portion so that both end openings face the combustor and the combustion gas stopper, and the space portion is divided into a region near the center and a region near the outer peripheral edge of the space portion. It has a cylindrical part,
The combustion gas supplied from the combustor into the space portion passes through the inside of the cylindrical portion and is reflected by the concave surface portion, thereby passing through the outside of the cylindrical portion and being positioned closer to the combustor. In the process in which the combustion gas is returned to the combustor, a part of the combustion gas passes through the gaps formed between the plurality of loop portions in the process of returning to the combustor. It is comprised so that it may flow out to the exterior of a hot water apparatus characterized by the above-mentioned.   The hot water device according to claim 2 or 3, wherein the combustion gas regulating cylindrical portion is configured using a spiral water pipe capable of passing water.   Of the coiled tube portion, the portion close to the combustion gas stopper is configured such that the size of the gap between the plurality of loop portions is smaller than the portion far from the combustion gas stopper, or no gap is formed. The hot water device according to any one of claims 1 to 4, wherein The combustion gas stopper is disposed in the intermediate portion in the fixed direction of the space portion, thereby dividing the space portion into first and second regions in the fixed direction, and the coiled tube body Dividing the section into first and second heat exchange sections surrounding the first and second regions,
After the combustion gas supplied from the combustor to the first region passes through the gaps between the plurality of loop portions in the first heat exchange unit and flows out of the first heat exchange unit The hot water device according to any one of claims 1 to 5, wherein the hot water device is configured to further pass through gaps between a plurality of loop portions in the second heat exchange portion.

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