JP2008032324A - Heat exchanger and water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger using a simple means for improving the mounting stability of a coiled pipe body of a water pipe while properly avoiding such a trouble that drain generated accompanied by heat recovery reaches to the bottom corner of a canned body and resides there. <P>SOLUTION: The heat exchanger B comprises a water pipe support 5 having a supporting plate 50 on which the coiled pipe body 40 and an auxiliary pipe body 41a of the water pipe 4 are placed, and located apart from the peripheral wall 20 of the canned body 2 and provided on a bottom wall 21B, and a rising wall 59a protruded upward from the upper face of the supporting plate 50 and provided along the outer peripheral edge of the supporting plate 50 so that a cutout 58 is formed to avoid interference with the auxiliary pipe body 41a. In the supporting plate 50 in the lower region of the auxiliary pipe body 41a, at least one through-hole 56 is formed for allowing drain on the supporting plate 50 to flow down therefrom. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a heat exchanger that recovers heat from combustion gas by using a water pipe, and a hot water device including the heat exchanger.

  The present applicant has previously proposed those described in Patent Documents 1 to 4 as specific examples of the heat exchanger. These conventional ones include at least one water pipe having a coiled tube part and a can that accommodates the coiled tube part therein. The upper and lower ends of the coiled tube portion are connected to an auxiliary tube portion that penetrates the cylindrical peripheral wall portion of the can, and the passage to the coiled tube portion is passed through the auxiliary tube portion. Water is possible. In the heat exchanger having such a configuration, when combustion gas is introduced into the can, heat is recovered from the combustion gas by the coiled tube portion, and water flowing through the inside is heated. The coiled tube portion can take a larger heat transfer area than, for example, a linear water tube. Therefore, in the heat exchanger as described above, it is possible to achieve high heat exchange efficiency while reducing the total number of water pipes and simplifying the structure and reducing the overall size.

  The coiled tube portion has a spiral shape, and its bottom portion is not flat but inclined. For this reason, it is easy to incline and lacks stability if the coiled tube portion is simply placed on the horizontal bottom wall portion of the can, for example. For this reason, as a support means of a coiled tube part, it is desired to use a support base having an inclined surface corresponding to the inclination of the coiled tube part. FIG. 32 of Patent Document 4 discloses that a coiled tube body is supported using such a support base.

  However, a part of the support base described in the document 4 is supported by the bottom wall part of the can body, while the other part is supported by the peripheral wall part of the can body. In such a structure, it is desirable to weld a part of the support base to the peripheral wall of the can body as a means for strengthening the mounting of the support base. Such welding is performed from the outside of the can body. It is difficult to do and must be done inside the can. Therefore, the welding operation is not easy.

  Therefore, the present inventors have conceived that the support base of the coiled tube body portion is separated from the peripheral wall portion of the can body and supported only on the bottom wall portion of the can body. According to such a means, after attaching a support stand to the bottom wall part of a can body, this bottom wall part should just be assembled | attached to a surrounding wall part, and the welding operation | work etc. at the time of the assembly | attachment become easy. However, when such a means is adopted, the following problems occur and it is necessary to eliminate them.

  That is, when latent heat is recovered from combustion gas in addition to sensible heat for the purpose of increasing heat exchange efficiency, water vapor in the combustion gas is condensed and a large amount of drain (condensed water) is generated, resulting in a coiled tube. Adhere to the outer surface of the body. Such a drain is generally strongly acidic, such as PH3, which has absorbed sulfur oxides, nitrogen oxides, etc. in the combustion gas. On the other hand, when the coiled tube portion is mounted on the support base, most of the drain flows from the coiled tube portion onto the support stand. If the support base is separated from the peripheral wall portion of the can body, the drain may flow down from the support base to the outer periphery, and this may travel to the corner of the bottom of the can body. In addition, the drain may flow from the coiled tube portion along the outer surface of the auxiliary tube portion, and may advance to the corner of the bottom of the can body. However, it is not desirable that the drain progresses to such a portion. This is because the strongly acidic drain stays in the corner of the bottom of the can body for a long period of time, and the portion may be easily corroded. Even when the material of the can body is made of stainless steel having excellent acid resistance, for example, from the viewpoint of enhancing its durability, it is desired that the drain does not stay in a specific location in the can body. Also, when the can body is manufactured, if the outer peripheral edge of the bottom wall portion is welded to the bottom portion of the peripheral wall portion, the welded portion may be altered, and the material of the can body is inherently acid resistant. Even if it is excellent, the acid resistance of the welded portion may be partially degraded. Therefore, when such a welding location exists, it is more necessary to prevent the drain from proceeding to the corner of the bottom of the can body.

  In the prior art, even if the coiled tube part is mounted on the support base, it is difficult to properly position the coiled tube part alone, for example, it is likely to be displaced in the horizontal direction. . Therefore, it is required that such a situation be appropriately solved by a simple structure.

JP-A-2005-321170 JP 2005-321171 A JP 2005-321172 A International Publication WO2005 / 108876

  The present invention has been conceived under such circumstances, and appropriately avoids the problem that the drain generated by heat recovery proceeds and stays in the corner of the bottom of the can body. It is an object of the present invention to provide a heat exchanger that can improve the stability of attachment of a coiled tubular body portion of a water pipe by a simple means, and a hot water device provided with the heat exchanger.

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

  The heat exchanger provided by the first aspect of the present invention includes a coiled tubular body part and at least one water pipe having an auxiliary tubular body part connected to a lower portion of the coiled tubular body part, and the coiled tubular body. A peripheral wall part surrounding the periphery of the part and a bottom wall part provided at the bottom part of the peripheral wall part, and a can body into which combustion gas is introduced into the inner space of the peripheral wall part, and the water pipe The auxiliary tube portion is a heat exchanger that penetrates the peripheral wall portion of the can body and is drawn out from the inside of the can body, and the coiled tube portion and the auxiliary tube portion are A water pipe support that has a receiving plate portion to be placed and is spaced apart from the peripheral wall portion of the can body and provided on the bottom wall portion; and projects upward from the upper surface of the receiving plate portion; and An outer periphery of the receiving plate portion so that a notch for avoiding interference with the auxiliary tube portion is formed. And the horizontal movement of the coiled tube portion is restricted, and when the drain flows on the receiving plate portion, the drain faces the outer periphery of the receiving plate portion. A standing wall that suppresses the flow, and in the lower region of the auxiliary tube portion of the receiving plate portion, at least the drain on the receiving plate portion can flow downward. One through hole is provided. Here, the “lower region of the auxiliary tube part” is not limited to the region directly below the auxiliary tube part, but includes a peripheral region.

  According to the configuration of the present invention, the following effects can be obtained.

  First, when a drain is generated on the outer surface of the coiled tube body as heat is recovered from the combustion gas, most of it flows down on the receiving plate portion of the water tube support. On the other hand, since the standing wall is provided upward at a position along the outer peripheral edge of the receiving plate portion, the rising wall serves as a stopper for the drain, and the drain serves as a stopper of the receiving plate portion. The flow toward the outside is appropriately suppressed. On the other hand, the standing wall forms a cutout portion that avoids interference with the auxiliary pipe body portion of the water pipe, and for the drain that falls in the lower region of the auxiliary pipe body portion, the flow of the drain is suppressed by the standing wall. Difficult to do. However, a through hole is provided in a lower region of the auxiliary tube portion of the receiving plate portion, and the drain flows down to the lower portion of the receiving plate portion through the through hole. It will not progress outside. In the present invention, although the water pipe support base is provided on the bottom wall part away from the peripheral wall part of the can body, as described above, the drain flows from the receiving plate part of the water pipe support base to the outer periphery thereof. It is possible to suppress appropriately, and it can prevent that many drains advance to the corner | angular part of the bottom of a can body, and stay for a long time. As a result, it is possible to suitably prevent or suppress the problem that the portion is easily corroded.

  Second, the standing wall not only serves as a drain stopper as described above, but also surrounds the periphery of the coiled tube part, thereby positioning the coiled tube part. Also plays the role of In addition, the coiled tube portion is mounted on the water tube support, but the receiving plate portion of the water tube support may be formed with an inclination corresponding to the inclination of the bottom of the coiled tube portion. It is easy, and the coiled tube part can be placed on the receiving plate part in a state with little or no inclination. From such a thing, the attachment stability of a coiled tube part is also improved. Of course, in the present invention, it is not necessary to support a part of the water pipe support on the peripheral wall portion of the can body, and there is no problem that it is difficult to mount the can.

  In a preferred embodiment of the present invention, the bottom wall portion and the water pipe support base are both formed in a hollow shape in plan view, and a combustion that communicates with an inner space of the peripheral wall portion at a substantially central portion thereof. An opening for gas passage is formed, and the water pipe support base has support plates near the inner periphery and the outer periphery that extend downward from the inner periphery and the outer periphery of the receiving plate, respectively. In addition, a gap is formed between the receiving plate portion and the bottom wall portion because their lower portions are supported by the bottom wall portion, and the support plate portion closer to the inner periphery includes: An opening is provided for allowing the drain to flow toward the combustion gas passage opening when the drain flows into the gap from the through hole of the receiving plate.

  According to such a configuration, the drain that has flowed down from the through hole of the receiving portion of the water pipe support to the gap below it is caused to flow into the opening for passage of the combustion gas and from this portion to the outside of the can body. It can be discharged properly. Therefore, the drain discharge process to the outside of the can body is performed rationally.

  In a preferred embodiment of the present invention, the support plate portion near the outer periphery of the water pipe support base has an opening through which the drain can flow into the gap when there is a drain on the outer periphery thereof. Is provided.

  According to such a configuration, even if the drain should flow to the outer peripheral region of the water pipe support base, the combustion gas passes through the drain through the gap from the opening of the support plate near the outer periphery of the water pipe support base. It becomes possible to make it flow into the opening part. Therefore, it is avoided that many drains remain in the outer peripheral region of the water pipe support.

  In a preferred embodiment of the present invention, among the bottom wall portion of the can body, between the peripheral wall portion and the water pipe support base, it projects upward and surrounds the entire circumference of the water pipe support base. The convex part formed in is provided.

  According to such a configuration, the loop-shaped convex portion serves as a stopper for the drain, and the drain is suppressed from flowing closer to the outer peripheral edge of the bottom wall portion than the convex portion. . Therefore, it can suppress more reliably that a drain advances to the corner part of a can body bottom part.

  In a preferred embodiment of the present invention, there is further provided a notch closing member that forms a hole through which the auxiliary tube body is inserted and is provided so as to close the notch of the standing wall. Yes.

  According to such a configuration, the drain that has progressed to the notch can be blocked by the notch closing member, and the drain can flow more reliably from the notch to the outer periphery of the water pipe support. It is suppressed. In particular, the notch blocking member is useful as a suitable stopper for the drain that travels along the outer surface of the auxiliary tube portion.

  The heat exchanger provided by the second aspect of the present invention includes a coiled tube part and at least one water pipe having an auxiliary tube part connected to an end of the coiled tube part, and the coiled tube A peripheral wall part surrounding the periphery of the body part and a bottom wall part provided at the bottom of the peripheral wall part, and a can body into which combustion gas is introduced into the inner space of the peripheral wall part, The auxiliary tube portion of the water pipe is a heat exchanger that passes through the peripheral wall portion of the can body and is drawn out from the inside of the can body, and is the coiled tube portion and the auxiliary tube portion. And a water pipe support that is provided on the bottom wall portion apart from the peripheral wall portion of the can body, and protrudes above the upper surface of the receiving plate portion, And an outer periphery of the receiving plate portion so as to form a notch for avoiding interference with the auxiliary tube portion. And the horizontal movement of the coiled tube portion is restricted, and when the drain flows on the receiving plate portion, the drain faces the outer periphery of the receiving plate portion. A standing wall that suppresses the flow, and a notch closing member that forms a hole through which the auxiliary tube body is inserted and is provided to close the notch of the standing wall. It is characterized by being.

  According to such a configuration, the standing wall and the notch closing member serve as a stopper that suitably prevents the drain from proceeding to the outer periphery of the water pipe support base. Advantages similar to those described for the heat exchanger provided by the side are obtained.

  The hot water device provided by the third aspect of the present invention includes a heat exchanger provided by the first aspect or the second aspect of the present invention, and combustion for supplying combustion gas into the can of the heat exchanger. And a vessel.

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

  Other features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings.

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

  FIGS. 1-10 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 so-called reverse combustion type in which fuel oil such as kerosene or light oil is sprayed downward by a spray nozzle 14 and burned. The sprayed fuel sprayed from the spray nozzle 14 is mixed with combustion air in the burner cylinder 11 and then discharged downward to burn. 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 via a pipe 12. . A blower fan 13 for supplying combustion air to the combustor 1 and a motor M that drives 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 (three in the present embodiment) of water pipes 4, a pair of headers 49 a and 49 b for incoming and outgoing hot water, and a water pipe support 5.

  The can body 2 has a substantially cylindrical peripheral wall portion 20, and an upper wall portion 21 </ b> A and a bottom wall portion 21 </ b> B provided on the upper and bottom portions of the peripheral wall portion 20. The upper wall portion 21 </ b> A and the bottom wall portion 21 </ b> B are each made of a separate member from the peripheral wall portion 20, and their outer peripheral edges are welded to the inner peripheral surface of the peripheral wall portion 20. As shown well in FIGS. 6 and 7, a loop-shaped convex portion 210 that surrounds the entire periphery of the water pipe support 5 is provided in an inner portion of the outer peripheral edge of the bottom wall portion 21 </ b> B than the welded portion w <b> 1. It has been. The convex portion 210 is formed by, for example, pressing the bottom wall portion 21B, and plays a role of suppressing the progress of the drain toward the welded portion w1, as will be described later. An opening 22A into which the lower part of the burner cylinder 11 enters is formed in the upper wall portion 21A of the can body 2. The bottom wall portion 21 </ b> B is formed with an opening 22 </ b> B for allowing the combustion gas recovered by the plurality of water tubes 4 to pass therethrough. Each member constituting the can body 2 is made of, for example, stainless steel having acid resistance so as not to be easily corroded due to a strongly acidic drain. This also applies to other members that may come into contact with the drain, such as the water tubes 4 and the water tube support 5.

  Each water pipe 4 includes a spiral coiled tube part 40 and auxiliary tube parts 41 a and 41 b connected to the lower end and the upper end of the coiled tube part 40. These auxiliary tube portions 41 a and 41 b may be integrated with or separate from the coiled tube portion 40. Each coiled tube portion 40 has a structure in which a series of hollow circular loop portions 40a connected in series are stacked in a plurality of stages through a plurality of gaps 31 in the vertical height direction. However, the coiled tube portions 40 of the plurality of water tubes 4 have different winding diameters and are arranged in a substantially concentric lap winding shape. A partition member 6 including a heat-resistant heat insulating material 68 is provided in the inner space portion 3 of the plurality of coiled tube portions 40, and the space portion 3 has first and second height directions in the vertical direction. It is partitioned into second regions 30a and 30b. As a result, the plurality of coiled tube sections 40 are divided into a first heat exchange section HT1 surrounding the first area 30a and a second heat exchange section HT2 surrounding the second area 30b. . A combustion gas passage 32 is formed between the plurality of coiled tube portions 40 and the peripheral wall portion 20 of the can 2.

  The auxiliary tube portions 41a and 41b extend in the tangential direction of the coiled tube portion 40, and both pass through the peripheral wall portion 20 of the can body 2 and are drawn out from the inside of the can body 2 to a pair of headers. 49a and 49b. However, more specifically, as shown in FIG. 10, the peripheral wall portion 20 of the can body 2 is provided with two openings 201 and 201 ′, and a plurality of auxiliary tube portions 41 a, 41b is inserted in a lump. The openings 201 and 201 'are closed by plate members 20B and 20B' that form a plurality of holes 202 and 202 'through which the plurality of auxiliary tube portions 41a and 41b are inserted, respectively. The plate members 20 </ b> B and 20 </ b> B ′ are thicker than the peripheral wall portion 20. According to such a structure, the support strength with respect to the auxiliary tube part 41a, 41b of the can body 2 can be raised. The peripheral wall portion 20 of the can body 2 is formed into a cylindrical shape by rounding a plate having convex ribs 200a and 200b at both ends into a cylindrical shape and then joining the convex ribs 200a and 200b. It is a thing. A water supply pipe (not shown) is connected to the header 49 a, and water such as tap water supplied from the water supply pipe is supplied into the plurality of water pipes 4. A hot water pipe (not shown) is connected to the header 49b, and hot water heated through the plurality of water pipes 4 is sent to a desired hot water supply destination through the hot water pipe.

  In FIG. 1 and FIG. 2, the water tube support 5 is for mounting and supporting a plurality of coiled tube portions 40 and auxiliary tube portions 41 a, and is separated from the peripheral wall portion 20 so as to be separated from the bottom wall portion. 21B is provided. Similar to the bottom wall portion 21B, the water pipe support base 5 has a hollow circular shape that forms an opening 22B for passage of combustion gas at the center thereof. More specifically, as shown in FIG. 9, the water pipe support 5 protrudes downward from the hollow circular substantially horizontal plate-shaped receiving plate portion 50 and the inner and outer peripheral edges of the receiving plate portion 50. Support plate portions 51 and 52 near the inner periphery and the outer periphery are provided. The receiving plate portion 50 is a portion that contacts the inclined bottom surface portion of the plurality of coiled tube portions 40. For this reason, the height H1 of the upper surface of the receiving plate portion 50 is the lowest at the location indicated by reference numeral n1 in FIG. 9, gradually increases from this location in the direction of the arrow N1, and is highest at the location indicated by reference sign n2. It has become. A level difference H2 is generated at locations indicated by reference numerals n1 and n2. As shown well in FIG. 4, a part of the auxiliary tube part 41 a is disposed at a position indicated by reference numeral n <b> 1, and extends from this part in a certain direction. The portion indicated by reference numeral n2 of the receiving plate portion 50 is formed in a shape that does not interfere with the arrangement of the auxiliary tube portion 41a.

  6 and 7, the lower portion of the support plate portion 51 is welded to the peripheral edge portion of the combustion gas passage opening 22 </ b> B. The lower part of the support plate part 52 is welded to the upper surface of the bottom wall part 21B. A gap portion 57 is formed between the receiving plate portion 50 and the bottom wall portion 21B. Since the inner region of the receiving plate portion 50 is an opening 22B for passage of combustion gas, when the drain flows down on the receiving plate portion 50, basically, the drain is as indicated by an arrow N2. Then, the gas flows from the inner peripheral edge of the receiving plate 50 into the combustion gas passage opening 22B.

  A plate material 59 is joined to the outer peripheral surface of the water pipe support 5, and an upright wall 59 a protruding upward from the upper surface of the receiving plate portion 50 is provided. This standing wall 59a is for preventing the drain which has flowed on the upper surface of the receiving plate portion 50 from flowing from the outer peripheral edge of the receiving plate portion 50 to the periphery thereof, and is often shown in FIGS. As shown in the figure, a part of the outer periphery of the water pipe support 5 is excluded and the entire other periphery is enclosed. The portion from which the plurality of auxiliary tube portions 41a are drawn is not provided with the standing wall 59a so as to avoid interference with them, and the portion is a notch 58.

  A through hole 56 is provided in a lower region of the receiving plate portion 50 below the plurality of auxiliary tube portions 41a. The through-hole 56 is used for allowing the drain to flow into the gap portion 57, and is preferably located near the notch portion 58 of the standing wall 59a as shown in FIG. It is an elongated shape extending to substantially the same length as the notch 58. As clearly shown in FIGS. 6 and 7, the drain that has entered the gap 57 flows into the combustion gas passage opening 22 </ b> B below the support plate 51 near the inner periphery of the water pipe support 5. An opening 55a is formed for this purpose. A plurality of openings 55 a are provided at appropriate intervals in the circumferential direction of the support plate portion 51. Also, a plurality of openings 55b that allow the drain to pass therethrough are provided at appropriate intervals in the lower part of the support plate 52 near the outer periphery. As shown in FIG. 6, in the portion where the plate material 59 exists adjacent to the support plate portion 52 near the outer periphery, the plate material 59 is also provided with an opening 55c communicating with the opening 55b.

  As clearly shown in FIG. 4, a notch closing member 54 that closes at least a part of the notch 58 is attached to the standing wall 59 a. The closing member 54 has a thin plate shape having a plurality of hole portions 54a through which the plurality of auxiliary tube portions 41a penetrate, and is attached by joining both ends thereof to the standing wall 59a. As shown in FIG. 7 and FIG. 8, this closing member 54 receives the lower end of the closing member 54 and the lower end of the closing member 54 so as to prevent the drain from flowing to the outer periphery of the receiving plate portion 50, like the standing wall 59a. It is provided so as not to generate a large gap between the upper surface of the plate portion 50. Unlike the plate member 20B described above, for example, the closing member 54 only needs to play a role as a drain stopper, and it is not necessary to ensure an airtight seal at a portion through which the auxiliary tube portion 41a passes. Therefore, a slight gap may exist between the inner peripheral surface of the hole 54a and the outer surface of the auxiliary tube portion 41a. Moreover, you may form the hole part 54a as a notch hole.

  In FIG. 1, 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 through the can 2 of the heat exchanger B flows downward into the bottom casing 80 and then makes an upward U-turn and proceeds to the bottom opening of the exhaust duct 81. The combustion gas flowing into the exhaust duct 81 is then discharged to the outside as exhaust gas from the exhaust port 81a. The drain generated in the heat exchanger B flows down from the combustion gas passage opening 22B onto the bottom 80a of the bottom casing 80. The drain received by the bottom 80a is externally connected to the bottom 80a. A discharge port 82 is formed for discharging the gas. The bottom portion 80a and the like are also materials having excellent acid resistance.

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

  First, when the combustor 1 is driven, combustion gas is supplied into the first region 30 a of the space 3. The combustion gas passes from the first region 30a through the plurality of gaps 31 of the first heat exchange portions HT1 of the plurality of water pipes 4 and flows into the combustion gas passage 32, and then the plurality of second heat exchange portions HT2. And flows into the second region 30b. In such a process, heat is sequentially recovered from the combustion gas by the plurality of coiled tube portions 40, and hot water flowing through the plurality of water tubes 4 is efficiently heated. When recovering heat from the combustion gas, in addition to sensible heat, it is also possible to recover latent heat, which causes a large amount of strongly acidic drain to be generated on the outer surface of each coiled tube portion 40.

  Most of the drains flow on the receiving plate portion 50 of the water tube support 5 along the outer surfaces of the plurality of coiled tube portions 40. Then, most of the drain flows from the inner peripheral edge of the receiving plate portion 50 into the combustion gas passage opening 22B as indicated by an arrow N2 in FIGS. Then, this drain falls into the bottom casing 80 and is then discharged from the discharge port 82 to the outside of the bottom casing 80. Even if the drain advances in the direction of the outer peripheral edge of the receiving plate portion 50 on the receiving plate portion 50, the standing wall 59 a exists there, so that the drain can be appropriately prevented from flowing down around the receiving plate portion 50. Is done. By making the upper surface of the receiving plate portion 50 an inclined surface whose height is lower at the inner peripheral edge than at the outer peripheral edge, the drain on the receiving plate portion 50 can easily flow toward the opening 22B for passing the combustion gas. You can also.

  As the drain, there is a drain that travels from the coiled tube portion 40 through the auxiliary tube portion 41 a and then flows down onto the receiving plate portion 50. A cutout portion 58 of the standing wall 59a is provided in the receiving plate portion 50 in the vicinity of the lower region of the auxiliary tube portion 41a. A through hole 56 is provided in front of the cutout portion 58. It has been. Therefore, most of the drain can flow from the through hole 56 to the gap 57 and not reach the notch 58 as indicated by an arrow N3 in FIG. The drain that has flowed down into the gap 57 then passes through the opening 55a and flows into the bottom casing 80 from the opening 22B for passage of combustion gas, as indicated by an arrow N4. As a means for facilitating such drain discharge, at least a portion of the bottom wall portion 21B that defines the gap portion 57 is inclined such that the height decreases as it approaches the combustion gas passage opening 22B. It can also be formed as a surface.

  Unlike the above, some drains may proceed toward the formation part of the notch 58 without flowing into the through hole 56. On the other hand, the notch 58 is blocked by the closing member 54, and the blocking member 54 can prevent the drain from proceeding further. Therefore, it is possible to prevent the drain from flowing out of the water pipe support 5 through the notch 58 almost certainly. The drain blocked by the blocking member 54 can also flow down into the gap 57 through the through-hole 56, and drain removal from the peripheral portion of the auxiliary tube portion 41a is promoted.

  The auxiliary tube portion 41a penetrates the closing member 54, and has a structure in which the closing member 54 surrounds the outer surface of the auxiliary tube portion 41a. For this reason, even if it is a case where it progresses along the outer surface of the auxiliary tube part 41a without flowing down on the receiving plate part 50, the further progress of this drain can be blocked | prevented by the closure member 54. . Therefore, it is also appropriately avoided that the drain flows along the outer surface of the auxiliary tube portion 41a to the plate member 20B of the peripheral wall portion 20.

  Furthermore, even if a phenomenon that the drain flows around the outer periphery of the water tube support 5 occurs, the loop-shaped convex portion 210 provided in that portion serves as a stopper for the drain, and the drain is a can body. Proceeding to the welded portion w1 at the bottom of the second is preferably prevented. As shown by the arrow N5 in FIG. 6 and FIG. 7, the drain whose progress is blocked by the convex portion 210 is discharged into the combustion gas passage opening 22B after flowing into the gap 57 from the opening 55b. It is possible to make it. Therefore, it is also appropriately avoided that many drains remain in the outer periphery of the water pipe support 5.

  Thus, in this embodiment, it is possible to prevent the drain from proceeding to the welded portion w1 at the bottom of the can body 2. Therefore, the problem that the welded portion w1 is easily corroded due to the drain is appropriately avoided. On the other hand, the plurality of coiled tube portions 40 can be supported in a stable posture by using the water tube support 5. Further, the standing wall 59a also serves to prevent the horizontal displacement of the plurality of coiled tube portions 40. As a result, the attachment stability of the plurality of coiled tube portions 40 and the auxiliary tube portions 41a can be further improved. Further, the water pipe support 5 is assembled to the bottom wall portion 21 </ b> B so as not to be supported by the peripheral wall portion 20 of the can body 2. Therefore, when the can body 2 is manufactured, after the water pipe support base 5 is assembled to the bottom wall portion 21B, the bottom wall portion 21B may be welded to the peripheral wall portion 20, and the operation is facilitated.

  In the above-described embodiment, the structure in which the through hole 56 is provided in the receiving plate portion 50 of the water pipe support base 5 and the structure in which the cutout portion 58 of the standing wall 59a is closed by the closing member 54 are combined. . However, the present invention is not limited to this, and only one of the structures may be adopted. This is because both the through hole 56 and the blocking member 54 exhibit an action of suppressing the drain from flowing out from the notch 58 of the upright wall 59a, and include only one of them. This is because the object of the present invention can be suitably achieved even with such a configuration.

  FIG. 11 shows another example of the present invention. In the figure, the same or similar elements as those in the above embodiment are given the same reference numerals as in the above embodiment.

  The hot water supply device Aa shown in FIG. 11 is of a so-called positive combustion type, and a combustor 1A is arranged below the heat exchanger Ba, and the combustion gas generated by the combustor 1A proceeds upward. It is configured. The heat exchanger Ba has a combustor opening 22A formed in the bottom wall portion 21B of the can 2 and a combustion gas whose heat recovery has been completed by a plurality of coiled tube portions 40 in the upper wall portion 21A. The heat recovery structure is configured such that the heat exchanger B of the above embodiment is inverted upside down. On the other hand, the water pipe support 5 is provided on the bottom wall 21B, and its basic structure is the same as that of the above embodiment. However, in this hot water supply device Aa, since it is not preferable to allow the drain to flow into the opening 22A for the combustor, the drain does not flow into the opening 22A. Specifically, a cylindrical upright portion 220 erected upward is provided on the inner peripheral edge of the opening 22A, and the drain that has flowed down from the water pipe support base 5 onto the bottom wall portion 21B is opened. It does not flow into 22A. The bottom wall portion 21B is provided with a drain discharge port 221 communicating with the gap portion 57, and all the drains reaching the bottom wall portion 21B are connected to the outside of the can body 2 from the discharge port 221. Can be discharged.

  As understood from the present embodiment, the heat exchanger according to the present invention can be used in combination with a forward combustion type combustor instead of being used in combination with a reverse combustion type combustor. In the heat exchanger according to the present invention, the traveling direction of the combustion gas does not matter.

  The present invention is not limited to the contents of the above-described embodiment. The specific configuration of each part of the heat exchanger and the hot water apparatus according to the present invention can be varied in design in various ways.

  In the present invention, when a through hole is provided in the receiving plate portion of the water pipe support base, the through hole may not have an elongated shape like the through hole 56 of the above embodiment. For example, a configuration in which a plurality of small through-holes such as a circle are provided may be employed. The standing wall referred to in the present invention can be formed integrally with the water pipe support base. For example, a member having an L-shaped cross section is used, a part thereof is a standing wall, and the other part is a water pipe support. It can also be set as the base plate part.

  There may be at least one water pipe, and the number is not limited. Further, the coiled tube portion of the water tube is not limited to a circular spiral shape, and may be formed in another shape such as a rectangular spiral shape. The can can also be formed into a rectangular cylinder, for example, corresponding to the shape of the coiled tube portion. When a plurality of water pipes are used, it is not necessary to make the pipe diameters the same. As the combustor, a gas combustor or the like can be used in addition to the oil combustor.

  The hot water device as used in the present invention means a device having a function of generating hot water, and is used for various types of hot water supply devices for general hot water supply, bath hot water supply, heating, snow melting, and the like, and hot water supply. Includes a device for producing hot water. In an apparatus for heating, an antifreeze liquid is often used as a heat medium. In the present invention, the concept of water supplied to a water pipe includes such an antifreeze liquid.

It is a schematic sectional drawing which shows an example of the hot water supply apparatus with which this invention was applied. It is principal part sectional drawing of the hot-water supply apparatus shown in FIG. FIG. 3 is a schematic plan sectional view taken along the line III-III in FIG. 2. It is a principal part expanded sectional view of FIG. It is a principal part expanded sectional view which shows the state which removed the water pipe and the obstruction | occlusion member from the structure shown in FIG. It is VI-VI principal part sectional drawing of FIG. It is VII-VII principal part sectional drawing of FIG. It is VIII-VIII principal part sectional drawing of FIG. It is a partial cross section perspective view which shows an example of a water pipe support stand. It is a disassembled perspective view of the heat exchanger used for the hot-water supply apparatus shown in FIG. It is a schematic sectional drawing which shows the other example of the hot water supply apparatus with which this invention was applied.

Explanation of symbols

A, Aa Hot water supply device (hot water device)
B, Ba Heat exchanger 1, 1A Combustor 2 Can body 4 Water pipe 5 Water pipe support 20 Circumferential wall (can body)
21B Bottom wall (can body)
22B Opening part for passage of combustion gas 40 Coiled tube part 41a Auxiliary tube part 50 Receptacle part (of water pipe support)
51,52 Support plate (water pipe support base)
54 Closure member 55a, 55b Opening (for drain passage)
56 Through-hole 57 Cavity 58 Notch (standing wall)
59a Standing wall

Claims (7)

At least one water pipe having a coiled tubular part and an auxiliary tubular part connected to the lower part of the coiled tubular part;
A peripheral wall portion surrounding the periphery of the coiled tubular body portion, and a can body having a bottom wall portion provided at the bottom of the peripheral wall portion and into which combustion gas is introduced into an inner space of the peripheral wall portion. And
The auxiliary pipe part of the water pipe is a heat exchanger that penetrates the peripheral wall part of the can body and is drawn out from the inside of the can body,
A water pipe support having a receiving plate portion on which the coiled tube portion and the auxiliary tube portion are mounted, and being provided on the bottom wall portion apart from the peripheral wall portion of the can;
Protruding upward from the upper surface of the backing plate portion and provided along the outer peripheral edge of the backing plate portion so as to form a cutout portion for avoiding interference with the auxiliary tube portion. The upright wall that restricts the horizontal movement of the coiled tube portion and suppresses the drain from flowing toward the outer periphery of the receiving plate portion when the drain flows on the receiving plate portion. And,
Of the receiving plate portion, a lower region of the auxiliary tube body portion is provided with at least one through-hole capable of flowing down the drain on the receiving plate portion. ,Heat exchanger. The bottom wall portion and the water pipe support base are both formed in a hollow shape in plan view, and an opening for passing a combustion gas communicating with the inner space of the peripheral wall portion is formed in a substantially central portion thereof. And
The water pipe support base has inner and outer support plate portions extending downward from the inner and outer peripheral edges of the receiving plate portion, and the lower portions thereof are supported by the bottom wall portion. A gap is formed between the backing plate and the bottom wall by being made,
The inner peripheral support plate is provided with an opening that allows the drain to flow toward the combustion gas passage opening when the drain flows into the gap from the through hole of the receiving plate. The heat exchanger according to claim 1.   The support plate near the outer periphery of the water pipe support is provided with an opening through which the drain can flow into the gap when there is a drain on the outer periphery thereof. The described heat exchanger.   Of the bottom wall portion of the can body, a convex portion is provided between the peripheral wall portion and the water pipe support base so as to protrude upward and surround the entire circumference of the water pipe support base. The heat exchanger according to any one of claims 1 to 3.   5. The cutout closing member provided so as to form a hole portion through which the auxiliary tubular body portion is inserted and to close the cutout portion of the standing wall. 5. The heat exchanger as described in. At least one water pipe having a coiled tubular part and an auxiliary tubular part connected to an end of the coiled tubular part;
A peripheral wall portion surrounding the periphery of the coiled tubular body portion, and a can body having a bottom wall portion provided at the bottom of the peripheral wall portion and into which combustion gas is introduced into an inner space of the peripheral wall portion. And
The auxiliary pipe part of the water pipe is a heat exchanger that penetrates the peripheral wall part of the can body and is drawn out from the inside of the can body,
A water pipe support that has a receiving plate portion on which the coiled tubular body portion and the auxiliary tubular body portion are mounted, and is provided on the bottom wall portion apart from the peripheral wall portion of the can body;
Protruding upward from the upper surface of the backing plate portion and provided along the outer peripheral edge of the backing plate portion so as to form a notch portion for avoiding interference with the auxiliary tube portion. The upright wall that restricts the horizontal movement of the coiled tube portion and prevents the drain from flowing toward the outer periphery of the receiving plate portion when the drain flows on the receiving plate portion. When,
A notch closing member which forms a hole through which the auxiliary tube body is inserted and which is provided so as to close the notch of the standing wall;
A heat exchanger characterized by comprising:   A hot water apparatus comprising: the heat exchanger according to any one of claims 1 to 6; and a combustor that supplies combustion gas into the can of the heat exchanger.

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