JP7225682B2 - Heat exchanger and water heater equipped with same - Google Patents

Description

INDUSTRIAL APPLICABILITY The present invention relates to a heat exchanger that is used as a component of a hot water system such as a hot water supply system and heats hot water by recovering heat from a heating medium such as combustion gas using a heat transfer tube. It relates to a water heater equipped with.

As a heat exchanger used in a water heating device, a heat transfer tube is housed in a case to which a heating medium such as combustion gas is supplied, and a heat transfer tube capable of heating hot water flowing through the heat transfer tube is widely known. ing.
A specific example of such a heat exchanger is shown in FIG. 8 of Patent Document 1, for example. In this heat exchanger, the case has a structure in which a case body portion having a side opening and a side plate portion closing the side plate portion are combined, and the heat transfer tubes are supported by the side plate portion. According to this configuration, in the process of assembling the heat exchanger, when the side plate portion is welded to the case main body with the tip end portion side of the heat transfer tube inserted into the case main body portion, the tip end portion side of the heat transfer tube is , there is a risk that the heat transfer tube and the side plate portion may be obliquely displaced due to their own weight.
Therefore, in Patent Document 1, the bottom wall of the case is provided with an upward projection for supporting the heat transfer tube. As a result, it is possible to prevent the positional deviation of the heat transfer tubes and the side plates.

However, according to the prior art, problems may occur as described below.
That is, since the upward protrusion is provided on the bottom wall of the case, the upward protrusion cannot be provided if the case does not have the bottom wall. More specifically, the case of the heat exchanger has a cylindrical shape with an open top surface and a bottom surface so as to allow the combustion gas to pass in the vertical direction, and does not have a bottom wall. When such a case is used, the upward protrusion cannot be provided, and it becomes difficult to appropriately prevent the positional deviation of the heat transfer tube and the side plate.
In addition, since the upward convex portion protrudes upward from the bottom wall portion of the case, it abuts on the lower portion of the heat transfer tube. If it exists, it is necessary to correspondingly increase the projection dimension of the upward projection. In this case, for example, it is difficult to easily and inexpensively provide the upward convex portion by step-pressing the bottom wall portion. As a result, there is a possibility of complicating the production process and increasing the manufacturing cost.

JP 2013-47575 A (Fig. 8) Japanese Patent No. 5212703 Japanese Patent No. 5600561

The present invention has been devised under the circumstances as described above, and it is possible to appropriately prevent problems such as positional deviation of the heat transfer tubes and the side plate portions of the cases that support them by means of a simple configuration. An object of the present invention is to provide a heat exchanger capable of

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

A heat exchanger provided by a first aspect of the present invention comprises a case into which a heating medium is supplied, and a heat transfer tube for heating hot water disposed in the case, wherein the case comprises a case main body portion having a plurality of side wall portions forming a side opening, and a side plate portion joined to the case main body portion so as to close the side opening portion, and the heat transfer tube is provided with the A heat exchanger supported by a side plate portion and projecting inwardly of the case from the side plate portion, wherein at least one of the side wall portions of the case main body portion or inside thereof a heat-transfer-tube supporting protrusion that is provided on the arranged auxiliary member and protrudes inwardly of the case from the side wall portion or the auxiliary member so as to support the heat-transfer tube and prevent the heat-transfer tube from moving downward; The heat transfer tube support projection has an upward or obliquely upward support surface located below any part of the heat transfer tube and abutting on that part, and at least the support surface A portion is characterized in that it is sloped downward so that the height becomes lower toward the side plate portion .

According to such a configuration, during or after the manufacture of the heat exchanger, the portion of the heat transfer tube located inside the case main body does not descend due to its own weight or the like. can be prevented by the presence of Therefore, it is possible to appropriately prevent the heat transfer tubes and the side plate portion of the case that supports the tubes from being tilted. In addition, the following effects are further obtained.
That is, since the heat transfer tube support protrusion is provided on the side wall of the case or on the auxiliary member provided inside thereof, the case has a lower opening shape without a bottom wall. Also, it is possible to prevent the inclination of the heat transfer tubes and the side plates by appropriately providing the heat transfer tube support projections.
In addition, even if the heat transfer tubes are located at a fairly high position from the bottom wall of the case, there is no need to increase the size of the heat transfer tube support projections accordingly, and the horizontal direction from the side wall or auxiliary member to the heat transfer tubes is not required. When the distance between is small, it is not necessary to make the projecting dimension of the heat transfer tube support protrusion large. Therefore, it is possible to avoid complication of the manufacturing work of the heat exchanger and to reduce the manufacturing cost by simply providing the heat transfer tube support projections by, for example, step pressing.

Furthermore , according to such a configuration, it is possible to facilitate the operation of inserting the heat transfer tubes into the case main body and supporting them on the heat transfer tube support protrusions in the manufacturing process of the heat exchanger. That is, when inserting the heat transfer tube into the case main body from the side opening, the tip of the heat transfer tube is brought into contact with the portion of the heat transfer tube support convex portion that slopes downward, and then the heat transfer tube is inserted into the case main body. By pressing further toward the inner part of the part, it is possible to set the heat transfer tube at an appropriate position on the heat transfer tube support convex part by the guide action of the downwardly inclined part of the support surface. .

In the present invention, preferably, the side wall portion or the auxiliary member is provided on the side wall portion or the auxiliary member and positioned above any part of the heat transfer tube so as to prevent the heat transfer tube from rising. A heat-transfer-tube-up prevention projection projecting inwardly of the case from the auxiliary member is further provided.

According to such a configuration, the heat transfer tube is properly prevented from rising unduly by the heat transfer tube rise prevention convex portion, and the positional deviation of the heat transfer tube and the side plate portion of the case that supports the heat transfer tube is more reliably prevented. It is possible to prevent In addition, the work of joining the side plate portion to the case main body portion can be made even easier. Like the heat-transfer-tube-supporting projections, the heat-transfer-tube-rising-preventing projections are provided on the side wall of the case or on the auxiliary member provided on the inner side thereof, so the case does not have a bottom wall. However, it can be provided appropriately.

A heat exchanger provided by a second aspect of the present invention comprises a case into which a heating medium is supplied, and a heat transfer tube for heating hot water disposed in the case, wherein the case comprises a case main body portion having a plurality of side wall portions forming a side opening, and a side plate portion joined to the case main body portion so as to close the side opening portion, and the heat transfer tube is provided with the A heat exchanger supported by a side plate portion and projecting inwardly of the case from the side plate portion, wherein at least one of the side wall portions of the case main body portion or inside thereof a heat-transfer-tube support protrusion provided on the arranged auxiliary member and protruding inwardly of the case from the side wall portion or the auxiliary member so as to support the heat-transfer tube and prevent its descent; provided on the side wall portion or the auxiliary member and positioned above any part of the heat transfer tube so as to prevent the heat transfer tube from rising from the side wall portion or the auxiliary member toward the inside of the case and a heat-transfer-tube rise-preventing projection that protrudes to the side, and the heat- transfer-tube-rise prevention projection is located above any part of the heat-transfer-tube and faces downward or obliquely to that part. It has a downward facing surface, and at least a part of this facing surface is characterized in that it is inclined upward so that the height increases toward the side plate portion.

According to such a configuration, when the heat transfer tube is inserted into the case main body in the manufacturing process of the heat exchanger, the leading end of the heat transfer tube is guided by the upwardly inclined portion of the facing surface, It is possible to easily arrange the heat transfer tubes at predetermined appropriate positions. Therefore, it is possible to facilitate the work of inserting the heat transfer tubes.

In the present invention, preferably, the side wall or the auxiliary member further includes a stepped portion protruding inwardly of the case. A supporting convex portion and the heat-transfer-tube-upward-preventing convex portion are formed.

According to such a configuration, it is possible to easily provide the heat-transfer-tube support protrusion and the heat-transfer-tube rise prevention protrusion at a low cost without using a separate member from the side wall portion of the case or the auxiliary member. .

In the present invention, preferably, as the stepped portion, a stepped portion provided with a groove portion in the middle of the vertical height direction is provided. The lower area is used as the heat transfer tube support protrusion, and the area above the concave groove is used as the heat transfer tube rise prevention protrusion.

According to such a configuration, it is possible to easily form the heat-transfer-tube support projections and the heat-transfer-tube-up prevention projections by using the stepped portion.

In the present invention, preferably, as the stepped portion, the stepped portion is positioned so as to be sandwiched between two portions of the heat transfer tube that are spaced apart in the vertical height direction, and the stepped portion is provided. The upper region of the heat transfer tube support protrusion is used as the heat transfer tube supporting protrusion, and the lower region is used as the heat transfer tube rise prevention protrusion.

According to such a configuration, while simplifying the configuration of the stepped portion, it is possible to appropriately form the heat transfer tube support protrusion and the heat transfer tube rise prevention protrusion using the stepped portion.

In the present invention, preferably, the heating medium is provided between a portion of the heat transfer tube that is not in contact with the heat transfer tube support protrusion and the side wall portion or the auxiliary member facing this portion. A gap is formed through which the

According to such a configuration, since the heating medium passes through the gap, the amount of the heating medium acting on the heat transfer tube can be increased, and the heat exchange efficiency can be improved.

In the present invention, preferably, as the heat transfer tubes, a plurality of straight tubular body portions extending in a substantially horizontal direction or inclined in a vertical height direction and arranged at intervals in the vertical height direction, A plurality of meandering or U-shaped heat transfer tubes connected in series via a connecting tube body portion are provided, and both longitudinal ends of the plurality of heat transfer tubes are supported by the side plate portions, and are connected to the case. The heat transfer tube support projections are provided so as to support the heat transfer tube positioned at the extreme end in the width direction among the plurality of heat transfer tubes.

According to such a configuration, it is possible to efficiently recover heat from the heating medium by using a plurality of meandering or U-shaped heat transfer tubes. It is possible to prevent the plurality of heat transfer tubes from descending, and to appropriately prevent the heat transfer tubes and the side plate portion from tilting obliquely.

A water heater provided by the third aspect of the present invention is characterized by comprising the heat exchanger provided by the first or second aspect of the present invention.

With such a configuration, the same effects as those described for the heat exchanger provided by the first or second aspect of the present invention can be obtained.

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

1 is a schematic perspective view showing an example of a heat exchanger according to the present invention; FIG. FIG. 2 is an exploded perspective view of FIG. 1; FIG. 2 is a sectional view taken along line III-III in FIG. 1; (a) is an IVa-IVa cross-sectional view of FIG. 3, (b) is an IVb-IVIb cross-sectional view of (a), and (c) is an IVc-IVc cross-sectional view of (a), (d) is a sectional view along IVd-IVd of (a). FIG. 4 is a cross-sectional view taken along line VV of FIG. 3; (a) is a perspective view of an auxiliary member used in the heat exchanger shown in FIG. 1, (b) is a front view of (a), and (c) is VIc- 6 is a VIc cross-sectional view, and (d) is a VId-VId cross-sectional view of (a). FIG. 2 is a side cross-sectional view showing a state of the heat exchanger shown in FIG. 1 during assembly work; (a) and (b) are side sectional views showing other examples of the present invention. FIG. 4 is a front cross-sectional view showing another example of the present invention; FIG. 4 is a front cross-sectional view showing another example of the present invention; FIG. 4 is a side cross-sectional view showing another example of the present invention;

Preferred embodiments of the present invention will be specifically described below with reference to the drawings.

The heat exchanger HE shown in FIGS. 1 and 2 includes a case C, a plurality of first and second heat transfer tubes 6A and 6B, a pair of headers 7a and 7b for water inlet and hot water outlet, and auxiliary members 3A and 3B. It has

The case C has a substantially rectangular tubular or frame shape with an upper and lower surface that are open. As shown in FIG. 3, the water heater WH using the heat exchanger HE has a structure in which a burner 80 and another heat exchanger 81 are provided on the upper side of the case C, for example. The other heat exchanger 81 is a primary heat exchanger for sensible heat recovery, and the heat exchanger HE of this embodiment is a secondary heat exchanger for latent heat recovery. In the water heater WH, the combustion gas generated by the burner 80 travels downward and sequentially passes through the heat exchangers 81 and HE, thereby sequentially recovering sensible heat and latent heat from the combustion gas. is used to heat hot water.

As shown in FIG. 2, the case C is configured by combining a case main body 1 having a substantially U-shaped plan view and side plates 2 provided with headers 7a and 7b. The case main body 1 includes three side walls 10 (10a to 10c) that form a side opening 11 and are connected in a substantially U-shape in plan view. The side plate portion 2 is welded to the case main body portion 1 so as to close the side opening portion 11, and the base end portions of the first and second heat transfer tubes 6A and 6B penetrate and are joined to the side plate portion 2. be done.

The first and second heat transfer tubes 6A, 6B are meandering heat transfer tubes and housed in a case C. As shown in FIG.
More specifically, as shown in FIGS. 2 and 5, the first heat transfer tube 6A includes a plurality of straight tubular body portions 60 extending substantially horizontally and arranged at intervals in the vertical height direction. , is a serpentine shape continuously connected via a plurality of connecting pipe body portions 61 which are semi-arcuate in side view. Both ends of the first heat transfer tube 6A pass through the side plate portion 2 and are connected to header portions 7a and 7b provided on the outer surface side of the side plate portion 2. As shown in FIG. The plurality of first heat transfer tubes 6A are arranged in the width direction of the case C at intervals. However, in order to improve the heat recovery efficiency, the plurality of first heat transfer tubes 6A are arranged in a staggered arrangement in which the adjacent first heat transfer tubes 6A are provided with a height difference as shown in FIG. there is

As shown in FIGS. 2 and 4, the second heat transfer tube 6B has straight tubular body portions 63 extending vertically and spaced apart from each other in the vertical direction, each having a semicircular arc shape when viewed from the side. It has a meandering shape that is connected in series via a plurality of connecting pipe body portions 62 of the . Both ends of the second heat transfer tube 6B are connected to header portions 7a and 7b in the same manner as the first heat transfer tube 6A. The second heat transfer tube 6B has good drainage properties because each straight tube body portion 63 is vertically inclined, and even if the inside of the first heat transfer tube 6A freezes in winter, this second heat transfer tube 6B Hot water can be supplied by circulating hot water through the second heat transfer tube 6B. Unheated hot water is supplied to a water inlet 70 of the header portion 7a, and the heated hot water passes through the first and second heat transfer tubes 6A and 6B, reaches the header portion 7b, and reaches a hot water outlet 71. hot water from
As shown in FIGS. 2 and 3, the second heat transfer tubes 6B are provided so as to be positioned on both left and right sides of the plurality of first heat transfer tubes 6A in the width direction of the case C. As shown in FIGS.

The auxiliary members 3A, 3B are attached inside the side walls 10a, 10b so as to be located in the gaps between the side walls 10a, 10b of the case C and the second heat transfer tubes 6B. Preventing excessive inflow of the combustion gas helps increase the amount of heat recovered by the second heat transfer tube 6B. These auxiliary members 3A and 3B are formed, for example, by bending a stainless steel plate.

As shown in FIG. 6, one auxiliary member 3A includes a main plate portion 30 which is substantially rectangular in front view and forms the main portion of the auxiliary member 3A, mounting portions 31a and 31b connected to upper and lower portions of the main plate portion 30, and It has stepped portions 4A and 4B. The stepped portions 4A and 4B are provided with heat transfer tube support protrusions 40a and 40b and heat transfer tube rise prevention protrusions 41a and 41b, which will be described later.

The attachment portions 31a and 31b are portions for attaching the auxiliary member 3A to the side wall portion 10a of the case C, and protrude from the main plate portion 30 toward the side wall portion 10a as the rear side thereof. Therefore, when the auxiliary member 3A is attached to the side wall portion 10a, a gap 39 is formed between the main plate portion 30 and the side wall portion 10a, and they are in a non-contact state (see FIG. 3). As a result, the central region of the main plate portion 30 in the vertical height direction can be flexurally deformed in the thickness direction of the auxiliary member 3A (the lateral width direction of the case C) indicated by the arrow Na in FIG. This allows the auxiliary member 3A to have dimensional flexibility, and even if there is a slight error in the mutual dimension between the side wall portion 10a and the second heat transfer tube 6B, the auxiliary member 3A is not forced to be placed in this portion. It is preferable because it can be arranged without

The stepped portions 4A and 4B are portions provided by pressing a part of the main plate portion 30 of the auxiliary member 3A in the thickness direction of the main plate portion 30. Protruding. The stepped portion 4A is provided at two upper and lower positions at a position closer to the inner part of the case C (the position on the side opposite to the side plate portion 2) (however, these two upper and lower stepped portion 4A are provided. It can also be provided in a continuous form). A recessed groove portion 47 with left and right openings is formed in the middle portion of the stepped portion 4A in the vertical direction when viewed from the front in FIG. 6(b). As shown in FIG. 4, the concave groove portion 47 is a portion into which the tip-side region 6a of the second heat transfer tube 6B enters.

The heat transfer tube support protrusion 40a is a portion for preventing the second heat transfer tube 6B and, in turn, the first heat transfer tube 6A from descending. corresponds to this. The heat transfer tube support projection 40a has an upward or obliquely upward support surface 45 that faces and engages the lower portion of the tip-side region 6a of the second heat transfer tube 6B. This support surface 45 corresponds to the lower side surface of the concave groove portion 47 . In FIG. 4(b), the support surface 45 has a curved surface shape corresponding to the outer peripheral surface of the second heat transfer tube 6B, but may have a planar shape instead. The support surface 45 is inclined downward at an appropriate angle α1 so that the height decreases toward the right side (toward the side plate portion 2) in FIGS. 4(a) and 6(b).

The heat-transfer-tube-rising prevention convex portion 41a is a portion for preventing the second heat-transfer-tube 6B, and thus the first heat-transfer-tube 6A, from rising. corresponds to this. The heat-transfer-tube rise prevention projection 41a faces the vicinity of the top of the tip-side region 6a of the second heat-transfer tube 6B, and has a downward or diagonally-downward facing surface 46 that can be engaged with this portion. The facing surface 46 may also be curved or planar, as with the support surface 45 described above. If the opposing surface 46 is brought into contact with the outer peripheral surface of the second heat transfer tube 6B, it is possible to substantially completely prevent the second heat transfer tube 6B from rising. Even if there is, it is possible to prevent the second heat transfer tube 6B from rising more than a predetermined amount. Therefore, the facing surface 46 does not necessarily have to be in contact with the second heat transfer tube 6B. The facing surface 46 is inclined at an appropriate angle α2 so that the height increases toward the right side (toward the side plate portion 2) in FIGS. 4(a) and 6(b).

As shown in FIG. 4(c), the concave groove portion 47 of the stepped portion 4A is formed so as to be positioned inward of the case C by an appropriate dimension from the main plate portion 30 of the auxiliary member 3A. According to such a configuration, a gap c1 is formed between a portion of the second heat transfer tube 6B in the longitudinal direction that is not in contact with the support surface 45 and the main plate portion 30 (step pressing process described later). excluding the contact portion between the portion 4B and the second heat transfer tube 6B). By allowing an appropriate amount of combustion gas to flow through this gap c1, it is possible to increase the amount of heat recovered by the second heat transfer tube 6B.

The stepped portion 4B is located relatively close to the side plate portion 2 in the case C, and is sandwiched between the two adjacent straight tubular body portions 63 of the second heat transfer tube 6B. It is provided so as to be positioned in a straight line, and has a substantially circular shape when viewed from the front.
A region near the top of the stepped portion 4B is a heat transfer tube support projection 40b, and has an upward or obliquely upward support surface 45 that abuts on the portion near the lower portion of the straight tubular body portion 63. support the heat transfer tubes 6B (see also FIG. 4(d)). A lower region of the stepped portion 4B is a heat-transfer-tube rise-preventing convex portion 41b, and a facing surface 46 directed downward or obliquely downward facing (preferably, in contact with) the portion near the upper portion of the straight tubular body portion 63. to prevent the second heat transfer tube 6B from rising.
The support surface 45 has an arcuate shape when viewed from the front, and a region Sa closer to the side plate portion 2 of the support surface 45 is a curved inclined surface whose height decreases toward the side plate portion 2 side. The contact surface 46 is also arcuate in front view, and the region Sa near the side plate portion 2 is a curved inclined surface whose height increases toward the side plate portion 2 side.

In the present embodiment, unlike the auxiliary member 3A, the other auxiliary member 3B has stepped portions 4A, 4B provided with heat-transfer-tube support protrusions 40a, 40b and heat-transfer-tube-up prevention protrusions 41a, 41b. There is no corresponding part provided. In the drawings, the parts of the auxiliary member 3B that are the same as those of the auxiliary member 3A are denoted by the same reference numerals as those of the auxiliary member 3A.

Next, the action of the heat exchanger HE described above will be described.

First, when assembling the heat exchanger HE, as shown in FIG. are omitted), and the first and second heat transfer tubes 6A and 6B are inserted into the case main body 1 through the side opening 11 thereof. After that, the side plate portion 2 closes the side opening portion 11 and the side plate portion 2 is welded to the case main body portion 1 .

During the assembly work described above, the position of the second heat transfer tube 6B can be regulated by the heat transfer tube support protrusions 40a and 40b and the heat transfer tube rise prevention protrusions 41a and 41b. Specifically, the tip-side region 6a of the second heat transfer tube 6B is supported by the heat transfer tube support protrusion 40a to prevent its descent, and is prevented from rising by the heat transfer tube rise prevention protrusion 41a. Is possible. In addition, the region near the base end of the second heat transfer tube 6B can be prevented from descending by the heat transfer tube support protrusion 40b, and can be prevented from rising by the heat transfer tube rise prevention protrusion 41b. Therefore, it is possible to prevent the first and second heat transfer tubes 6A and 6B from unduly tilting, and to properly weld the side plate portion 2 to the case main body portion 1 in a state of setting the side plate portion 2 in a desired accurate arrangement and posture. Become.

Since the support surfaces 45 of the heat-transfer-tube support projections 40a and 40b are slanted downward, and the contact surfaces 46 of the heat-transfer-tube rise prevention projections 41a and 41b are slanted upward, these It is possible to smoothly guide the second heat transfer tube 6B to a predetermined position along the surface. Therefore, it is possible to facilitate and expedite the work of inserting the first and second heat transfer tubes 6A and 6B into the case main body 1 .

The heat transfer tube support protrusions 40a and 40b and the heat transfer tube rise prevention protrusions 41a and 41b are provided by forming the stepped portions 4A and 4B on the auxiliary member 3A, and a member different from the auxiliary member 3A is provided. No need to use it separately. Therefore, it is possible to reduce the number of parts, improve productivity, and reduce the manufacturing cost of the heat exchanger HE.

8-11 show another embodiment of the invention. In these figures, elements that are the same as or similar to those in the above embodiment are denoted by the same reference numerals as those in the above embodiment, and redundant description thereof will be omitted.

In the heat exchanger HEa shown in FIG. 8(a), the auxiliary member 3A is provided with stepped portions 4C to 4E corresponding to the tip-side regions 6a of the second heat transfer tubes 6B. The stepped portion 4C has a substantially circular shape in a front view similar to the stepped portion 4B. 46 is a heat-transfer-tube rise-preventing convex portion 41c. The step-pressed portion 4D constitutes a heat-transfer-tube support protrusion 40d having a rectangular shape in a front view and having a support surface 45 extending along a portion of the lower surface of the second heat-transfer tube 6B. The step-pressed portion 4E constitutes a heat-transfer-tube rise-preventing projection 41e having an oblong front rectangular shape and a contact surface 46 extending along the top surface of another part of the second heat-transfer tube 6B.
Also in this embodiment, the second heat transfer tube 6B is prevented from being lowered or raised unduly, and the first and second heat transfer tubes 6A, 6B and the side plate portion 2 are inclined during the assembly work of the heat exchanger HEa. It is possible to properly prevent the occurrence of such a problem, and to facilitate and optimize the assembly work.

In the heat exchanger HEb shown in FIG. 8B, the auxiliary member 3A is provided with stepped portions 4F to 4H. The stepped portion 4F has a substantially trapezoidal shape when viewed from the front. It is the part 41f. The stepped portion 4</b>G is V-shaped when viewed from the front, and constitutes a heat transfer tube support protrusion 40 g having a support surface 45 . The stepped portion 4H has an inverted V-shape when viewed from the front, and constitutes a heat-transfer-tube rise prevention convex portion 41h having an abutment surface 46. As shown in FIG.
Each support surface 45 and each contact surface 46 are in contact with the second heat transfer tube 6B in the range Sb shown in FIG. The range Sc on the right side) is inclined away from the second heat transfer tube 6B, and serves as a guide portion that guides the second heat transfer tube 6B when it is inserted into the case main body 1. there is
According to this embodiment, the operation of inserting the second heat transfer tube 6B into the case main body 1 so as to arrange it at a predetermined proper position is further facilitated.

In the heat exchanger HEc shown in FIG. 9, both the pair of left and right auxiliary members 3A and 3B are provided with the heat transfer tube support projections 40a and the heat transfer tube rise prevention projections 41a.
According to the present embodiment, compared with the previous embodiment in which the heat-transfer-tube support projections 40a and the heat-transfer-tube-up prevention projections 41a are provided only on one of the auxiliary members 3A, positioning of the second heat-transfer-tube 6B is It is possible to aim more accurately.

In the heat exchanger HEd shown in FIG. 10, the side walls 10a and 10b of the case main body 1 are provided with a stepped portion 4A having a heat transfer tube support protrusion 40a and a heat transfer tube rise prevention protrusion 41a. . The auxiliary members 3A and 3B are not provided in the case main body 1. As shown in FIG.
According to this embodiment, since the auxiliary members 3A and 3B are not used, it is more preferable to reduce the manufacturing cost by reducing the number of parts.

In the heat exchanger HEe shown in FIG. 11, only the first heat transfer tubes 6A are used as the heat transfer tubes arranged inside the case C, and the second heat transfer tubes 6B are not used. In response to this, in the present embodiment, a plurality of stepped portions 4I that constitute the heat-transfer-tube support projections 40i and the heat-transfer-tube-up prevention projections 41i for preventing the first heat-transfer-tube 6A from moving downward or upward are provided. is provided.
As can be understood from the present embodiment, the heat transfer tube whose position is restricted by the heat transfer tube support protrusion and the heat transfer tube rise prevention protrusion is not limited to the second heat transfer tube 6B.
Further, as can be understood from the present embodiment and the previous embodiments, the specific shape, size, arrangement, etc. of the stepped portion, the heat transfer tube support protrusion, and the heat transfer tube rise prevention protrusion in the present invention are It is not limited, and configurations other than those of the above-described embodiments are possible.

The invention is not limited to the content of the embodiments described above. The specific configuration of each part of the heat exchanger and the water heater according to the present invention can be changed in various ways within the intended scope of the present invention.

As a heat transfer tube, a U-shaped tube can be used instead of a meandering tube, and a heat transfer tube having another configuration such as a spiral tube disclosed in Patent Document 1 can also be used. Note that when a serpentine tube is used as a heat transfer tube, unlike the above-described embodiment, a plurality of straight tubular body portions extending in a substantially horizontal direction are arranged at intervals in a substantially horizontal direction, and these straight pipes It is also possible to adopt a mode in which the tubular body portions are connected via a connecting tubular body portion.

The heat-transfer-tube support projections and the heat-transfer-tube rise-prevention projections are not limited to those formed using the step-pressed portion, and various formation methods can be used. It can also be formed by providing a cut-and-raised portion protruding to the side. As described above, the specific shapes of the heat-transfer-tube support projections and the heat-transfer-tube-up prevention projections are not limited to those of the above-described embodiment.
According to the present invention, even if the case of the heat exchanger does not have a bottom wall, it is possible to provide the heat-transfer-tube support protrusion and the heat-transfer-tube rise prevention protrusion. It may be a configuration comprising The heating medium used in the present invention is not limited to combustion gas generated by a burner, and may be high-temperature exhaust gas.
The heat exchanger according to the invention can be other than for latent heat recovery.
The water heater as used in the present invention is a concept that includes not only water heaters for general hot water supply and hot water supply for baths, but also water heaters for hot water heating and snow melting.

HE, HEa to HEe Heat exchanger WH Water heater C Case 1 Case body 10 (10a to 10c) Side wall (of case body)
11 Side opening (of case body)
2 Side plate portions 3A, 3B Auxiliary members 4A to 4I Stepped portions 40a to 40d, 40f, 40g, 40i Heat transfer tube support protrusions 41a to 41c, 41e, 41f, 41h, 41i Heat transfer tube rise prevention protrusions 45 Support surface 46 Facing surface 47 concave groove (of stepped portion)
6A, 6B first and second heat transfer tubes (heat transfer tubes)

Claims (9)

a case in which a heating medium is supplied;
A heat transfer tube for heating hot water arranged in the case,
and
The case includes a case body portion having a plurality of side wall portions forming side openings, and a side plate portion joined to the case body portion so as to block the side openings,
The heat exchanger tube is supported by the side plate portion and protrudes from the side plate portion toward the inside of the case,
provided on at least one of the side walls of the case main body or on an auxiliary member arranged inside thereof, and supporting the heat transfer tubes to prevent the heat transfer tubes from descending from the side walls or the auxiliary members; It further comprises a heat transfer tube support projection projecting inward of the case ,
The heat transfer tube support projection has an upward or obliquely upward support surface that is positioned below any part of the heat transfer tube and abuts on that part, and at least part of this support surface is A heat exchanger, characterized in that the heat exchanger is inclined downward so that the height becomes lower toward the side plate portion . A heat exchanger according to claim 1,
Provided on the side wall portion or the auxiliary member and positioned above any part of the heat transfer tube to prevent the heat transfer tube from rising, from the side wall portion or the auxiliary member to the inside of the case A heat exchanger further comprising a heat-transfer-tube rise-preventing projection projecting in one direction . a case in which a heating medium is supplied;
A heat transfer tube for heating hot water arranged in the case,
and
The case includes a case body portion having a plurality of side wall portions forming side openings, and a side plate portion joined to the case body portion so as to block the side openings,
The heat exchanger tube is supported by the side plate portion and protrudes from the side plate portion toward the inside of the case,
provided on at least one of the side walls of the case main body or on an auxiliary member arranged inside thereof, and supporting the heat transfer tubes to prevent the heat transfer tubes from descending from the side walls or the auxiliary members; a heat transfer tube support projection projecting inwardly of the case;
Provided on the side wall portion or the auxiliary member and positioned above any part of the heat transfer tube to prevent the heat transfer tube from rising, from the side wall portion or the auxiliary member to the inside of the case and a heat transfer tube rise prevention convex portion protruding in one direction,
The heat-transfer-tube rise-preventing protrusion has a downward or obliquely-downward facing surface positioned above any part of the heat transfer tube and facing that part. A heat exchanger , characterized in that the heat exchanger has an upwardly inclined shape in which the height increases toward the side plate portion . The heat exchanger according to claim 2 or 3 ,
further comprising a stepped portion provided on the side wall portion or the auxiliary member and projecting inwardly of the case,
A heat exchanger in which the heat-transfer-tube-supporting projection and the heat-transfer-tube-lift-preventing projection are formed using the step-pressed portion. A heat exchanger according to claim 4 ,
As the stepped portion, the stepped portion is provided with a concave groove portion in the middle of the vertical height direction,
In the stepped portion, a region below the concave groove portion is the heat transfer tube supporting convex portion, and a region above the concave groove portion is the heat transfer tube rise preventing convex portion. Heat exchanger. The heat exchanger according to claim 4 or 5 ,
As the stepped portion, the stepped portion is positioned to be sandwiched between two portions of the heat transfer tube that are spaced apart in the vertical direction,
A heat exchanger in which an upper region of the stepped portion serves as the heat transfer tube support projection, and a lower region thereof serves as the heat transfer tube rise prevention projection. The heat exchanger according to any one of claims 1 to 6 ,
A gap through which the heating medium can pass is formed between a portion of the heat transfer tube that is not in contact with the heat transfer tube support projection and the side wall portion or the auxiliary member facing this portion. A heat exchanger. The heat exchanger according to any one of claims 1 to 7,
As the heat transfer tubes, a plurality of straight tubular bodies extending substantially horizontally or inclined in the vertical height direction and arranged at intervals in the vertical height direction are connected via connecting tubular bodies. Equipped with a series of serpentine or U-shaped heat transfer tubes,
The plurality of heat transfer tubes are arranged in the width direction of the case with both ends in the longitudinal direction supported by the side plate portions,
The heat exchanger according to claim 1, wherein the heat transfer tube support protrusion is provided to support a heat transfer tube positioned at the extreme end in the width direction among the plurality of heat transfer tubes. A water heater comprising the heat exchanger according to any one of claims 1 to 8.

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