JP5633254B2 - Heat exchanger - Google Patents

Description

The present invention is a type of heat exchange in which a plurality of heat transfer tubes are housed in a case in which a heating medium such as combustion gas is supplied, and heat is recovered from the heating medium using the plurality of heat transfer tubes. about the vessel.

  In heat exchangers that recover heat from combustion gas, the case for housing the heat transfer tube is usually made of metal from the viewpoint of improving heat resistance, mechanical strength, and the like. As such a metal case, a rectangular tube case main body having openings on both side surfaces and a side plate for closing the opening of the case main body are manufactured by processing the metal plate, Some are welded (see, for example, Patent Document 1).

  However, the work of processing the metal plate to manufacture each of the case main body and the side plate is complicated. It is not easy to assemble the heat exchanger by welding them. For this reason, conventionally, the manufacturing cost of the heat exchanger has been relatively high. Moreover, when using a some heat exchanger tube, it is desirable to provide the header part for making the fluid used as a heating object flow in and out efficiently in these heat exchanger tubes. However, conventionally, when such a header portion is provided, the manufacturing operation of the heat exchanger is further complicated, and the manufacturing cost is further increased.

  Conventionally, there is a heat exchanger case made of resin (see Patent Document 2). However, even in such a configuration, when the header portion is provided, there is an inconvenience that the header portion must be manufactured separately from the case and then assembled to the case. Therefore, there is still room for improvement in reducing the manufacturing cost.

JP 2009-180398 A Japanese Patent No. 4087407

The present invention has been conceived under the circumstances as described above, and is intended to provide a heat exchanger that is easy to manufacture and that can reduce the manufacturing cost as compared with the prior art. It is an issue.

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

Heat exchangers more provided to the onset bright accommodates a plurality of heat transfer tubes, and a case for introducing the heating medium therein, is connected to the plurality of heat transfer tubes, and said plurality of heat transfer A header for allowing the fluid to be heated to flow into or out of the pipe, and the case includes a case body having an opening formed on a side surface and a side plate that closes the opening. The side plate of the case is resin-molded integrally with the header portion and configured as a header-integrated side plate, and the header portion circulates the heating target fluid. And a hole for inserting the plurality of heat transfer tubes is provided in the header-integrated side plate in communication with the chamber, and the plurality of heat transfer tubes include the hole portion. Between the inner surface of the heat transfer tube and the outer surface of the plurality of heat transfer tubes A seal member for sealing between the stopper this sealing member is restricted from moving in the direction exiting from the hole is characterized in that it is mounted.

According to such a configuration, it is not necessary to manufacture the header part separately from the side plate of the case, and since these can be manufactured simultaneously and integrally by the resin molding process, the manufacture is easy. Become. There is no inconvenience of assembling the header part to a side plate or the like. Further, if the header-integrated side plate is made of resin, it is not necessary to employ complicated means such as welding or brazing when the header-integrated side plate is assembled to the case body, and for example, bonding is performed using an adhesive. Such simple means can also be adopted. For this reason, according to the present invention, the manufacturing operation and the assembly operation of each part of the heat exchanger are simplified as compared with the conventional one, and the manufacturing cost can be greatly reduced.
Furthermore, according to such a configuration, a structure that can appropriately flow the heating target fluid between the inside of the plurality of heat transfer tubes and the chamber of the header portion while preventing leakage of the heating target fluid is easily and appropriately performed. Realized.

  In the present invention, preferably, the header-integrated side plate has a convex portion that can be fitted into the opening and positioned with respect to the case body.

  According to such a configuration, it is possible to position the header-integrated side plate and the case main body by fitting the convex portion into the opening of the case main body, so that the heat exchanger can be more easily assembled. Become. It is also possible to reduce the size of the gap between the convex portion and the heat transfer tube by fitting the convex portion into the case body so that a large amount of heating medium does not pass through this gap. It is. This is preferable for improving the heat exchange efficiency.

  In the present invention, preferably, the header-integrated side plate further includes a protection means that covers and protects a portion facing the inside of the case main body.

  According to such a configuration, since the header-integrated side plate is protected, it is preferable in terms of enhancing durability and the like. In addition, as the material of the header-integrated side plate, it is possible to use an inexpensive resin that is not so high in heat resistance.

  In the present invention, preferably, the hole portion is formed so that the end portions of the plurality of heat transfer tubes can be collectively inserted, and the seal member is provided at each end portion of the plurality of heat transfer tubes. A plurality of O-rings to be externally fitted are integrally connected.

  According to such a structure, when connecting a some heat exchanger tube and a header part, what is necessary is just to insert a some heat exchanger tube collectively with respect to one hole part, for example with respect to a some hole part Compared with the case where a plurality of heat transfer tubes are individually inserted, the operation becomes much simpler. Further, since the seal member has a configuration in which a plurality of O-rings are integrally connected, the work of mounting the seal member on the plurality of heat transfer tubes is facilitated. Therefore, it is more preferable to improve the assembly workability of the heat exchanger.

  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.

(A) is a plane sectional view showing an example of the heat exchanger concerning the present invention, and (b) is the front sectional view. It is a decomposition | disassembly front sectional drawing of the case of the heat exchanger shown in FIG. It is a principal part disassembled perspective view of the heat exchanger shown in FIG. It is IV-IV sectional drawing of Fig.1 (a). FIG. 5 is an exploded cross-sectional view of the portion shown in FIG. 4. It is VI-VI sectional drawing of FIG. (A) is a disassembled perspective view of the stopper used with the heat exchanger shown in FIG. 1, (b) is the front view. (A), (b) is principal part sectional drawing which shows the other example of the heat exchanger which concerns on this invention. It is a plane sectional view showing other examples of the heat exchanger concerning the present invention.

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

1 to 7 show an example of a heat exchanger to which the present invention is applied and a configuration related thereto.
As clearly shown in FIG. 1, the heat exchanger HE1 of this embodiment includes a plurality of heat transfer tubes 1, a case C that accommodates the plurality of heat transfer tubes 1, and a pair of header portions 3 (3A 3B). However, the pair of header portions 3 are formed integrally with the header-integrated side plate S1 of the case C, as will be described later.

  The plurality of heat transfer tubes 1 have a plurality of helical tube portions that are oval in plan view (see also FIG. 3). The plurality of helical tube portions are different in size from each other and are arranged in a substantially concentric overlapping shape. The upper end side and the lower end side portion of each heat transfer tube 1 are formed as straight tubular body portions 10 a and 10 b extending substantially horizontally, and the end portions of the straight tubular body portions 10 a and 10 b are connected to the header portion 3. However, the specific connection structure will be described later.

  A heating medium for heating each heat transfer tube 1 can flow into the case C. More specifically, as the heating medium, for example, combustion gas generated by a burner (not shown) is used, and this combustion gas enters the case C from the air supply port 21 of the rear wall portion 20a of the case C. After that, it is discharged to the outside as exhaust gas from the exhaust port 22 of the front wall portion 20b. In such a progression process of the combustion gas, the combustion gas acts on each part of the plurality of heat transfer tubes 1, and hot water flowing through each heat transfer tube 1 is heated. The header part 3 has an opening 30 for entering or discharging hot water. In this heat exchanger HE1, hot water supplied to the opening 30 of the lower header 3 (3B) flows into each heat transfer tube 1 and is heated by heat exchange with the combustion gas. The heated hot water is discharged from the opening 30 of the upper header 3 (3A) to the outside and supplied to a desired hot water supply destination.

As shown in FIG. 2, the case C includes a case body 2, a header-integrated side plate S <b> 1, and a side plate 7.
It has. The case body 2 has a rectangular tube shape (a rectangular parallelepiped shape with both end openings) in which openings 25 are formed on both left and right side surfaces, and is formed using a metal plate. As the metal plate, a stainless steel plate having excellent acid resistance is preferably used. The reason is that when the heat exchanger HE1 is used for the latent heat recovery application, a strongly acidic drain (condensed water) is generated with the latent heat recovery from the combustion gas.

  The side plate 7 is made of a resin excellent in heat resistance and acid resistance (for example, PPS: polyphenylene sulfide resin or SPS: syndiotactic polystyrene resin). The side plate 7 is a flat plate having a rectangular shape as a whole, but a wide area on the inner side surface of the side plate 7 is formed as a convex portion 70 that fits into the opening 25. By fitting the convex portion 70 and the opening 25, the side plate 7 is positioned and mounted on the case body 2 and closes the opening 25. The outer peripheral edge 71 of the side plate 7 serves as a stopper portion that comes into contact with the end of the case body 2 when the convex portion 70 is fitted into the opening 25. As a means for ensuring the fixation between the side plate 7 and the case body 2, for example, a means for adhering them using an adhesive can be employed.

  Like the side plate 7, the header-integrated side plate S 1 is made of a resin having excellent heat resistance and acid resistance, such as PPS and SPS, but has a side plate main body 6 and a pair of header parts 3. These have the structure integrally formed. The side plate main body 6 has a substantially flat plate shape capable of closing the opening 25, and has the same configuration as that of the side plate 7 described above. That is, a wide area on the inner side surface of the side plate main body 6 is formed as a convex portion 60 that can be fitted into the opening 25, and the header-integrated side plate S 1 is positioned and mounted on the case main body 2 by these fittings. As a means for ensuring these fixations, for example, an adhesive is used. When the header-integrated side plate S1 is attached to the case main body 2, as shown in FIG. 4, a part of the outer peripheral edge 61 of the side plate main body 6 is used as a stopper portion that contacts the end of the case main body 2. This point is also the same as the side plate 7 described above. The header portion 3 is formed so as to protrude laterally from the outer surface of the side plate main body portion 6, and a chamber 31 (see FIG. 3 and the like) in which an opening 30 for hot water or water is formed is formed inside. ing.

  As means for connecting the plurality of heat transfer tubes 1 to the header portion 3, as shown in FIGS. 3 to 6, a seal member 4, a stopper 5, and a pressing plate 8 are used. More specifically, the seal member 4 is formed by arranging a plurality of O-rings 40 that can be externally fitted to the ends of the plurality of heat transfer tubes 1 in a side-by-side manner, and integrally forming them so that they are connected in series. It is.

  The stopper 5 serves to position the seal member 4, but also serves to define the relative positional relationship between the plurality of heat transfer tubes 1. This stopper 5 is a combination of a pair of upper and lower pieces 50 as shown in FIG. The pair of pieces 50 are both resin molded products, and preferably have the same shape and size. The pair of pieces 50 have a plurality of semicircular recesses 51 that form through holes into which the plurality of heat transfer tubes 1 can be inserted when they are combined with each other. Furthermore, the pair of pieces 50 has a convex portion 52a and a concave portion 52b for positioning when combining them. Moreover, it has the engaging protrusion 53a and the to-be-engaged part 53b which can mutually be engaged. The stopper 5 is attached to the plurality of heat transfer tubes 1 so that the heat transfer tubes 1 are sandwiched from above and below by a pair of pieces 50.

  Each heat transfer tube 1 is provided with a convex portion 15 formed by flare processing. On the other hand, a concave portion 55 is formed on the inner surface of the stopper 5 to allow the convex portion 15 to enter the inside. The positioning of the heat transfer tubes 1 and the stoppers 5 is achieved by the engagement between the concave portions 55 and the convex portions 15. One side surface 56 of the stopper 5 can abut on one surface of the seal member 4. This appropriately prevents the seal member 4 from being unjustly displaced in the direction closer to the stopper 5.

  A hole 33 is provided in the inner side surface of the header-integrated side plate S1, and the hole 33 collectively includes the end portions of the plurality of heat transfer tubes 1, the seal member 4, and the stopper 5. It is possible to enter inside. The inner side of the hole 33 communicates with the chamber 31 of the header section 3 through a plurality of flow paths 32. Therefore, as shown in FIGS. 4 and 6, the interior of each heat transfer tube 1 can be communicated with the chamber 31 in a state where the plurality of heat transfer tubes 1 are inserted into the holes 33. Of the inner surface of the hole 33, a portion 33 a corresponding to the outer peripheral edge of the seal member 4 has the same shape as the contour of the outer peripheral edge of the seal member 4, and contacts the portions of the outer peripheral edge of the seal member 4 without a gap. Is configured to do. As a result, an appropriate waterproof seal is achieved. A step portion 34 is provided in the inner portion of the hole portion 33, and the seal member 4 is configured to contact the step portion 34.

  The pressing plate 8 is a member for fixing the stopper 5 and the header-integrated side plate S1, and has a flat plate shape having an opening 80 for allowing a part of the stopper 5 to enter (in FIG. 5, For the sake of convenience, the illustration of the pressing plate 8 is omitted). This presser plate 8 is screwed, for example, to the inner surface of the header-integrated side plate S <b> 1, and a part thereof is in contact with one end of the stopper 5.

  Next, the operation of the heat exchanger HE1 described above will be described.

  First, the header-integrated side plate S1 is manufactured by a resin molding process using a mold. For this reason, the manufacture is easy, and the productivity is high compared with the case where a side plate and a header part are manufactured separately, for example. Since the header-integrated side plate S1 is made of resin, as described above, an adhesive may be used as a means for firmly joining the header-integrated side plate S1 to the case body 2. Compared with welding or brazing, the operation is easy and the assemblability is good. When the header-integrated side plate S1 is assembled to the case main body 2, the convex portion 60 is fitted into the opening 25 of the case main body 2 so that the positioning is appropriately achieved. Is even better. For this reason, the productivity of the heat exchanger HE1 can be increased and the manufacturing cost can be reduced.

  As shown in FIG. 4, the convex portion 60 of the header-integrated side plate S <b> 1 enters the case C by an appropriate dimension L <b> 1. According to such a structure, the dimension L2 of the clearance gap between each heat exchanger tube 1 and header integrated side plate S1 can be made small. If this dimension L2 is large, a lot of combustion gas is wasted passing through the gap, but according to the configuration of this embodiment, such waste is reduced and the amount of heat recovered by the heat transfer tube 1 is increased. Will be able to.

  When connecting the plurality of heat transfer tubes 1 to the header portion 3, the seal member 4 is configured as a single seal member in which a plurality of O-rings 40 are connected in series, and thus transmits a plurality of O-rings separated from each other. Compared with the case where the heat pipes 1 are individually attached, the attaching operation becomes easier. Further, since the plurality of heat transfer tubes 1 and the seal member 4 may be inserted into the hole portion 33 of the header portion 3 in a lump, the operation is also easy. Therefore, the workability when assembling the heat exchanger HE1 can be further improved. In addition, the stopper 5 is also preferable for stably supporting the plurality of heat transfer tubes 1 in order to perform the relative positioning and fixing of the plurality of heat transfer tubes 1. Furthermore, since the stopper 5 is also used as a positioning means for the seal member 4, the number of parts can be reduced and the manufacturing cost can be further reduced as compared with the case where other members dedicated to the stopper 5 are used. .

  8 and 9 show another embodiment of the present invention. In these drawings, elements that are the same as or similar to those in the above embodiment are given the same reference numerals as in the above embodiment.

  In the embodiment shown in FIG. 8A, a metal plate 9 is provided in the case C. The metal plate 9 is a member for protecting the header-integrated side plate S1 and corresponds to an example of the protection means in the present invention, and covers substantially the entire inner surface of the header-integrated side plate S1. Preferably, the metal plate 9 is made of a material superior in heat resistance to the header-integrated side plate S1, more preferably in acid resistance. From the viewpoint of reducing the manufacturing cost, the metal plate 9 has a relatively simple configuration in which a bent portion 90 is provided on the outer peripheral edge of a flat plate member, for example, and the bent portion 90 is a header-integrated side plate. It is configured to be sandwiched and fixed between the convex portion 60 of S1 and the case body 2.

  According to the present embodiment, the header-integrated side plate S <b> 1 is appropriately prevented from being damaged by the influence of the combustion gas or the strongly acidic drain due to the presence of the metal plate 9. The header-integrated side plate S1 can be made of an inexpensive material with slightly inferior heat resistance or acid resistance, which is suitable for further reducing the manufacturing cost. In the drawing, a gap (air layer) is provided between the metal plate 9 and the header-integrated side plate S1, and this air layer functions as a heat insulating layer. Therefore, it is more preferable in preventing the header-integrated side plate S1 from being damaged by heat. Of course, a heat insulating layer (a heat insulating layer using a heat insulating material with low thermal conductivity) different from the air layer may be provided, or the metal plate 9 may be attached to the header integrated side plate S1 without providing such a heat insulating layer. You may make it contact. Instead of the metal plate 9, a plate made of a material other than metal can be used, or a protective coating film can be provided on the inner surface of the header-integrated side plate S1.

  In the embodiment shown in FIG. 8B, a part of the metal plate 9 is formed in a convex shape, and this convex portion is a pressing portion 91 for securing the stopper 5 and the header-integrated side plate S1. It is configured as. According to such a configuration, unlike the previous embodiment, there is no need to use a pressing member (pressing plate 8) for the stopper 5.

  In the heat exchanger HE2 shown in FIG. 9, a plurality of heat transfer tubes 1 (1B, 1C) is a straight tube body extending substantially in a straight line. The case C2 has header integrated side plates S2 and S3. The header-integrated side plate S2 is formed by integrally resin-molding the header portions 3C and 3D for incoming water and hot water with the side plate main body portion 67. The header-integrated side plate S3 is obtained by integrally molding a header portion 3E for returning hot water with the side plate main body portion 68. In this heat exchanger HE2, the hot water supplied from the water inlet 39a to the header portion 3C passes through the heat transfer pipe 1B connected to the header portion 3C and flows into the header portion 3E for returning hot water. Thereafter, it passes through the heat transfer tube 1C and reaches the header portion 3D, and the hot water is discharged from the hot water outlet 39b.

  Also in the heat exchanger HE2 of the present embodiment, the use of the header-integrated side plates S2 and S3 makes it possible to facilitate the overall manufacturing and reduce the manufacturing cost. As will be understood from the present embodiment, the heat transfer tube does not necessarily have to use a helical tube, and other various heat transfer tubes (for example, a U-shaped tube in addition to the above-described straight tube). A serpentine flexible tube or the like.

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

  In the present invention, the side plate (corresponding to the side plate 7 in the above embodiment) that does not require the case main body and the header does not matter whether it is made of resin. Therefore, the entire case can be made of resin.

In the present invention, when a plurality of header portions are provided in the heat exchanger, it is preferable that all of the plurality of header portions are integrally formed with the side plate, but the present invention is not limited to this. For example, as long as some of the header portions are integrally formed with the side plate, even if there is a header portion that is not integrally formed with the side plate, it is included in the technical scope of the present invention. (For example, in the embodiment shown in FIG. 9, either one of the header-integrated side plates S2 and S3 is replaced with a combination structure of a header portion and a side plate manufactured using a metal plate similar to the conventional one). Even within the technical scope of the present invention).

  Various fluids other than the combustion gas can be used as the heating medium. The heat exchanger according to the present invention is not limited to the latent heat recovery. Moreover, the fluid to be heated is not limited to hot water, and can be applied to uses for heating other fluids.

HE1, HE2 Heat exchangers C, C2 Cases S1-S3 Header integrated side plate 1 Heat transfer tube 2 Case body 3, 3C, 3D, 3E Header 4 Seal member 5 Stopper 9 Metal plate (protection means)
25 Opening 31 Chamber 33 Hole 40 O-ring 60 Convex

Claims (4)

A case for accommodating a plurality of heat transfer tubes and for allowing a heating medium to flow into the interior;
A header portion connected to the plurality of heat transfer tubes and for causing the fluid to be heated to flow into or out of the plurality of heat transfer tubes, and
The case has a case body having an opening formed on a side surface, and a side plate that closes the opening, and is a heat exchanger,
The side plate of the case is resin-molded integrally with the header portion, and is configured as a header-integrated side plate ,
The header part has a chamber for circulating the fluid to be heated,
The header-integrated side plate is provided with holes for inserting the plurality of heat transfer tubes in communication with the chamber,
The plurality of heat transfer tubes are configured to seal a gap between the inner surface of the hole and the outer surface of the plurality of heat transfer tubes, and restrict the movement of the seal member in the direction of exiting the hole. A heat exchanger, wherein a stopper is mounted .   The heat exchanger according to claim 1, wherein the header-integrated side plate has a convex portion that can be fitted into the opening and positioned with respect to the case body.   3. The heat exchanger according to claim 1, further comprising a protection unit that covers a portion of the header-integrated side plate that faces the inside of the case main body and that can protect the portion. 4. The hole portion is formed so that the end portions of the plurality of heat transfer tubes can be inserted together,
The heat exchanger according to any one of claims 1 to 3, wherein the sealing member is configured such that a plurality of O-rings that are externally fitted to respective end portions of the plurality of heat transfer tubes are integrally connected . .

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