JP5648829B2 - Heat exchanger - Google Patents

Description

  The present invention relates to a heat exchanger having a configuration in which a heat transfer tube is accommodated in a case.

  Conventionally, as this type of heat exchanger, there is one described in Patent Document 1. In the heat exchanger described in the same document, a cylindrical main body portion of a case that accommodates a heat transfer tube is configured by joining two predetermined members. Such a configuration is preferable in reducing the total number of components of the case and reducing the manufacturing cost of the heat exchanger.

  However, it is desirable to further reduce the manufacturing cost of the heat exchanger. On the other hand, in the prior art, although the main body of the case is composed of two members, if these two members are separately manufactured and prepared by different manufacturing processes, their manufacturing costs are still low. Tend to be expensive. Therefore, there is still room for improvement in this regard.

JP 2009-180398 A

  The present invention has been conceived under the circumstances as described above, and provides a heat exchanger capable of reducing the manufacturing cost of a case for housing a heat transfer tube as compared with the conventional case. That is the issue.

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

The heat exchanger provided by the present invention includes a case that accommodates the heat transfer tube therein, and the case includes an upper wall portion, a lower wall portion, a front wall portion, a rear wall portion surrounding the upper and lower sides of the heat transfer tube, And a case body having an inlet and an outlet for the heat exchange medium, the case body being a heat exchanger configured by joining the first and second members, Each of the first and second members is a main plate portion that is the upper wall portion or the lower wall portion, and a standup that is bent from the main plate portion and is the front wall portion or the rear wall portion. A plate portion and an opening provided in the upright plate portion and serving as the inflow port or the outflow port, and the first and second members are respectively connected to the main plate portion and the upright plate portion. Shape and size of the outer circumference of the main plate, the upright plate portion with respect to the main plate portion Bending angle, and placement of the opening, the shape and size, Ri substantially identical der, the standing plate portion includes a main upright plate portion erected from one of the front and rear end edges of the main plate portion, erected from the other And an auxiliary upright plate portion having a lower standing height than the main upright plate portion, and the opening includes a front end edge portion, a base end edge portion, and both sides in the left-right width direction of the main upright plate portion. It is made into the notch shape formed in the said main standing board part without notching an edge part, The said case main-body part is the main standing board part and auxiliary stand-up which mutually correspond of the said 1st and 2nd member. Openings offset from the respective joints as a plurality of openings that have two joints joined to each other at the front edges of the plate part and serve as inlets and outlets for the heat exchange medium It is characterized by having a configuration in which only the above is provided .

According to such a configuration, the number of constituent members of the case main body can be reduced, and the first and second members constituting the case main body are manufactured from the same kind of raw materials through the same process. The same or nearly identical parts. For example, when the first and second members are manufactured from a metal plate, the metal plate is punched using the same die to punch out the outer periphery and the opening of the main plate portion and the upright plate portion. A plurality of intermediate products may be manufactured, and the plurality of intermediate products may be bent at the same angle by bending the upright plate portion with respect to the main plate portion. Both the first and second members used in the invention can be obtained. Therefore, according to this invention, the manufacturing cost of the 1st and 2nd member and by extension, the manufacturing cost of the whole heat exchanger can be reduced compared with the past.

Furthermore, according to the configuration described above, it is possible to prevent a junction from being present at the periphery of the inlet and outlet of the heat exchange medium, and to appropriately connect ducts and other members to these inlet and outlet. It becomes possible. More specifically, a member such as a duct for supplying a heat exchange medium toward the case is often connected to the inflow port. In addition, a member such as a duct for guiding the heat-exchanged medium flowing out from the outlet to a desired position may be connected to the outlet. Unlike the configuration described above, if there is a joint at the periphery of the inlet or outlet, this joint causes a step on the surface of the periphery of the inlet or outlet. There is a possibility that it may be difficult to appropriately close the member to the periphery of the inlet or the outlet. On the other hand, according to the said structure, such a fear can be avoided appropriately. According to the configuration in which the main upright plate portion and the auxiliary upright plate portion are provided as the upright plate portions, and the tip portions thereof are joined to each other, the positioning and welding operations are facilitated, and the first and second The work of joining the members can be facilitated.

  In the present invention, preferably, the lower one of the two joints is configured to be located upstream in the flow direction of the heat exchange medium in the case.

  According to such a configuration, when the heat exchanger according to the present invention is used for, for example, a latent heat recovery application, drain water (condensed water) generated along with the latent heat recovery proceeds toward the joint. It is preferable to prevent this. When the joint is a welded part, for example, it is not preferable that drain water proceeds to this part from the viewpoint of preventing corrosion, but according to the above configuration, such a situation can be appropriately avoided. it can.

  In the present invention, preferably, the main plate portion is formed with a step portion for reducing a gap formed between the main plate portion and the first and second members. The arrangement, shape and size of the parts are substantially the same.

  According to such a configuration, due to the presence of the stepped portion, the gaps between the upper wall portion and the lower wall portion of the case and the heat transfer tube are reduced, so that the effect of improving the heat exchange efficiency can be expected. In addition, the respective step portions of the first and second members can be formed by the same process, which is more preferable in reducing the manufacturing cost.

  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.

It is a perspective view which shows an example of the heat exchanger which concerns on this invention. It is a disassembled perspective view of the heat exchanger shown in FIG. FIG. 3 is a sectional view taken along line III-III in FIG. 1. It is IV-IV sectional drawing of FIG. It is a perspective view which shows the process in the middle of manufacture of the 1st and 2nd member which comprises the case of the heat exchanger shown in FIG. It is a cross-sectional view showing another example of heat exchangers.

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

  1 to 4 show an example of a heat exchanger to which the present invention is applied. 1 and 2, the heat exchanger HE of this embodiment includes two types of heat transfer tubes 1 and 2 and a case C that accommodates these heat transfer tubes 1 and 2 inside. doing.

  The heat exchanger HE of the present embodiment is used as, for example, a constituent element of a hot water device, and performs heat recovery using a plurality of heat transfer tubes 1 and 2 from a combustion gas generated by a burner (not shown). It has a function of heating hot water (including antifreeze) flowing through the heat transfer tubes 1 and 2. However, this heat exchanger HE is a heat exchanger for recovering latent heat, and another heat exchanger (not shown) for recovering sensible heat is provided in the front stage of this heat exchanger HE, and this heat exchanger The combustion gas after the sensible heat is recovered after passing through the vessel is supplied to the heat exchanger HE.

  Each of the plurality of heat transfer tubes 1 and 2 has a configuration in which a plurality of helical tubes having an oval shape in plan view are arranged in a substantially concentric wrapping shape. The heat transfer tube 1 is for heating hot water used for general hot water supply, whereas the heat transfer tube 2 is for heating hot water (including antifreeze liquid) used for hot water heating, so these sizes are different. doing. The lower end portion and the upper end portion of the heat transfer tube 1 are formed as straight pipe portions 10a and 10b extending substantially horizontally, which pass through the side plate 60 of the case C and have a water inlet 30 and a hot water outlet 31, respectively. Headers 3A and 3B. The heat transfer tube 2 is also the same, and the lower end portion and the upper end portion of the heat transfer tube 2 are straight pipe portions 20a and 20b that extend substantially horizontally, these penetrate the side plate 61 of the case C, and the water inlet 40 and It is connected to a pair of headers 4A and 4B each having a hot water outlet 41.

  The case C has a substantially rectangular parallelepiped shape, and has a case main body portion 5 having both left and right ends opened. The openings at the left and right ends of the case body 5 are closed by the side plates 60 and 61 described above. The case body 5 includes an upper wall 50a, a lower wall 50b, a front wall 51a, and a rear wall 51b that surround the heat transfer tubes 1 and 2. (See also FIGS. 3 and 4). Combustion gas inflow ports 52a and 53a are formed in the rear wall 51b, and combustion gas outflow ports 52b and 53b in which heat is recovered are formed in the front wall 51a. The inlet 52 a and the outlet 52 b correspond to the heat transfer tube 1, and the inlet 53 a and the outlet 53 b correspond to the heat transfer tube 2. As shown in FIG. 4, the heat transfer tubes 1 and 2 are partitioned by a partition plate 90.

  The case main body 5 is configured by joining the first and second members M1 and M2. The first and second members M1 and M2 are both configured by pressing a metal plate, but as described later, they are the same or almost the same parts manufactured through the same process. .

In FIG. 2, the first member M1 includes a main plate portion 50, a main upright plate portion 51A standing up in a bent state from both front and rear edges of the main plate portion 50, an auxiliary upright plate portion 51B, openings 52 and 53, and a stepped portion. 54a-54c, and a hole 55 for drain water. The main plate portion 50 is a portion that is the lower wall portion 50 b of the case main body portion 5. The main upright plate portion 51A and the auxiliary upright plate portion 51B are portions that are part of the front wall portion 51a and the rear wall portion 51b of the case main body portion 5, and the main upright plate portion 51A is auxiliary upright. The standing height is higher than that of the plate portion 51B. The openings 52 and 53 are portions that are the outlets 52b and 53b, and are formed in the main upright plate portion 51A in a non-notched shape. The step portions 54a to 54c are portions where predetermined portions of the main plate portion 50 are projected in the thickness direction of the main plate portion 50, and as shown in FIGS. 3 and 4, the lower surface portion of the heat transfer tubes 1 and 2 and the main plate portion. This is to reduce the gap between the two and 50. Since the heights H1 to H3 of the lower surface portions of the heat transfer tubes 1 and 2 are different, the heights of the step portions 54a to 54c are also different from each other. The step portions 54a to 54c can also be formed so as to be in contact with the lower surface portions of the heat transfer tubes 1 and 2 (in a state where the gap is eliminated). The drain water hole 55 is used for discharging drain water generated along with the recovery of latent heat from the combustion gas to the outside of the case C, and is located at a position near the main upright plate portion 51A in the main plate portion 50. Is provided. Although omitted in the drawing, a member for connecting a piping member for guiding the drain water to a desired location is attached to the drain water hole 55.

  In FIG. 2, the second member M2 is different from the first member M1 in that it does not have the drain water hole 55, but the shape, size, arrangement, etc. of all other parts are all different. Identical (substantially the same with negligible manufacturing errors). For this reason, about the 2nd member M2, the code | symbol same as the code | symbol used for the 1st member M1 is attached | subjected suitably. However, the main plate portion 50 of the second member M2 is the upper wall portion 50a of the case C, and the openings 52 and 53 are the inflow ports 52a and 53a.

  The first and second members M1, M2 can be manufactured through the following process. That is, first, a plurality of intermediate products M ′ having a form as shown in FIG. 5 are manufactured by pressing a metal plate as a raw material. Each intermediate product M ′ includes a main plate portion 50 in which stepped portions 54 a to 54 c are formed, portions 51 A ′ and 51 B ′ corresponding to the main upright plate portion and auxiliary upright plate portions connected thereto, and openings 52 and 53. Have. Next, each intermediate product M ′ is bent along the locations indicated by the imaginary lines L1 and L2 in FIG. As a result, the main upright plate portion 51A and the auxiliary upright plate portion 51B that are erected from the main plate portion 50 are formed, and a completed product or a close product of the first and second members M1 and M2 is obtained. For the first member M1, a drain water hole 55 is additionally provided, but for the second member M2, only the series of steps described above is required. Instead of additionally providing a drain water hole 55 in the first member M1, for example, a drain water hole 55 is provided in both the first and second members M1 and M2. For the second member M2, a means for closing the drain water hole 55 with an appropriate member may be employed.

  The case body 5 is configured so that the first member M1 and the second member M2 are opposed to each other in a state in which the second member M2 is shaped like the first member M1 rotated 180 °. It is comprised by joining. In this joining, means for abutting and welding the front end portions of the main upright plate portion 51A and the auxiliary upright plate portion 51B is employed (see FIG. 3). Therefore, the case body 5 is provided with two joints J1 and J2 located on the rear wall 51b and the front wall 51a. The inflow ports 52a and 53a and the outflow ports 52b and 53b are offset in the vertical direction of the case C by appropriate dimensions from the joints J1 and J2. Further, although the heights of the joints J1 and J2 are different from each other, the joint J1 having a lower height is closer to the combustion gas inlets 52a and 53a and is upstream in the combustion gas flow direction in the case C. Located on the side.

  The step portions 54a and 54b of the first member M1 were different in height corresponding to the step on the lower surface portion of the heat transfer tube 1, but as shown well in FIG. The heat transfer tube 1 has a height difference between a portion near the front wall portion 51a and a portion near the rear wall portion 51b, and the upper surface portion of the heat transfer tube 1 has a step having a shape corresponding to the lower surface portion. For this reason, the step portions 54a and 54b of the second member M2 are formed in the same shape and size as the step portions 54a and 54b of the first member M1, but with respect to the upper surface portion of the heat transfer tube 1. Approach or contact each other appropriately.

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

  First, as described with reference to FIG. 5 and the like, the first and second members M1 and M2 constituting the case body 5 can be regarded as almost the same parts manufactured through the same process. Therefore, compared with the case where the first and second members M1, M2 are manufactured by different processes, it is preferable to reduce the manufacturing cost thereof and reduce the overall manufacturing cost of the heat exchanger HE. . The first and second members M1 and M2 can be joined because the end portions of the main upright plate portion 51A and the auxiliary upright plate portion 51B have only to be brought into contact with each other and welded.

  Combustion gas supply ducts and other members are connected to the peripheral edges of the combustion gas inlets 52a and 53a. Also, an exhaust gas guide member called an exhaust top may be connected to the peripheral edges of the outlets 52b and 53b. On the other hand, in this heat exchanger HE, the inflow ports 52a and 53a and the outflow ports 52b and 53b are located at positions offset from the joints J1 and J2, and the inflow ports 52a and 53a and the outflow ports 52b and 53b. The peripheral edge can be a flat surface without irregularities. Therefore, the above-described supply duct and other members can be appropriately brought into contact with and connected to the planar portion.

  Unlike the joint portion J2, the joint portion J1 is at a position where the height of the case C is relatively low. However, since this junction J1 is located upstream in the combustion gas flow direction, the acidic drain water generated with the recovery of latent heat is scattered on the combustion gas flow toward the junction J1. Coming in is suppressed. Further, the case C is set so that the front side of the lower wall portion 50b in which the drain water hole 55 is provided is slightly lower than the rear side so that drainage of drain water is promoted. . When it sets in this way, it is suppressed more appropriately that drain water contacts the junction part J1. Case C is made of, for example, stainless steel having acid resistance, but it is more preferable that a large amount of acidic drain water is in contact with welded joint portion J1 from the viewpoint of appropriately preventing corrosion of joint portion J1. However, in the heat exchanger HE, such a problem is appropriately suppressed.

FIG. 6 shows another embodiment of the heat exchanger . 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.

  In the embodiment shown in FIG. 6, a combustion gas inflow port 52a is provided in the lower wall portion 50b of the case C, and a combustion gas outflow port 52b is provided in the upper wall portion 50a. The combustion gas that has flowed into the case C from the inflow port 52a travels toward the outlet 52b while acting on each part of the plurality of heat transfer tubes 1, and the combustion gas that has finished heat recovery passes through the outlet 52b in the case C. Appropriately discharged outside. As understood from the present embodiment, the inflow port and the outflow port of the combustion gas can be configured to be provided on the lower wall portion and the upper wall portion instead of the front wall portion and the rear wall portion. Of course, the positional relationship between the inflow port and the outflow port of the combustion gas can be reversed. For example, contrary to the configuration shown in FIG. 6, the opening of the upper wall 50a may be the inflow port 52a, and the opening of the lower wall 50b may be the outflow port 52b. Furthermore, contrary to the embodiment shown in FIGS. 1 to 4, the openings provided in the front wall 51 a are the inlets 52 a, 53 a, and the openings provided in the rear wall 51 b are the outlets 52 b, It does not matter as 53b.

  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.

As each component of the first and second members in the present invention, the main plate portion that is the upper wall portion or the lower wall portion of the case, the upright plate portion that is the front wall portion or the rear wall portion of the case, It suffices if an opening serving as an inflow port or an outflow port for the heat exchange medium is provided, and the first and second members may be configured to further include elements other than the above-described components. Absent. As the standing plate portion, it is preferable that both the main standing plate portion and the auxiliary standing plate portion having different lengths as in the above-described embodiment are provided. A configuration in which only one upright plate portion is provided may be employed. The first and second members have substantially the same shape and size of the outer periphery of the main plate portion and the upright plate portion, the bending angle of the upright plate portion with respect to the main plate portion, and the arrangement, shape, and size of the opening. If it is. With such a configuration, it is possible to reduce the manufacturing cost by using the first and second members as the same or almost the same parts manufactured from the same kind of raw material through the same process. is there.

  The heat transfer tube is not limited to the one using a spiral tube, and may be configured to use, for example, a straight tube, a U-shaped tube, a meandering flexible tube, or the like. Moreover, it cannot be overemphasized that it can replace with the structure which accommodated two types of heat exchanger tubes in one case, and can be set as the structure which accommodated only one type of heat exchanger tubes. As the heat exchange medium, various fluids other than the combustion gas can be used. Therefore, the heat exchanger according to the present invention is not limited to recovering latent heat, and can be applied to various uses other than hot water heating applications.

HE heat exchanger C case M1, M2 1st and 2nd member J1, J2 joint part 1, 2 heat exchanger tube 5 case body part 50 main plate part 50a upper wall part 50b lower wall part 51A main upright plate part (stand up plate part) )
51B Auxiliary Standing Plate (Standing Plate)
51a Front wall 51b Rear wall 52, 53 Opening 52a, 53a Combustion gas inlet (heat exchange medium inlet)
52b, 53b Combustion gas outlet (heat exchange medium outlet)
54a-54c Step

Claims (3)

It has a case that houses the heat transfer tube inside,
This case includes an upper wall portion that surrounds the upper and lower sides of the heat transfer tube, a lower wall portion, a front wall portion, a rear wall portion, and a case main body portion having an inlet and an outlet for a heat exchange medium,
The case body is a heat exchanger configured by joining the first and second members,
Each of the first and second members is a main plate portion that is the upper wall portion or the lower wall portion, stands up in a bent state from the main plate portion, and is the front wall portion or the rear wall portion. An upright plate portion, and an opening provided in the upright plate portion and serving as the inflow port or the outflow port,
The first and second members have a shape and size of an outer periphery of each of the main plate portion and the upright plate portion, a bending angle of the upright plate portion with respect to the main plate portion, and an arrangement, shape, and size of the opening. , Ri substantially identical der,
The upright plate portion has a main upright plate portion raised from one of front and rear end edges of the main plate portion, and an auxiliary upright plate portion standing up from the other and having a lower standing height than the main upright plate portion. ,
The opening has a non-notched shape formed in the main upright plate portion without cutting out a front edge, a base end edge, and left and right side edges of the main upright plate portion. ,
The case body has two joints in which the front edge portions of the first and second members corresponding to each other of the main upright plate and the auxiliary upright plate are joined together,
The heat exchanger is characterized in that only a plurality of openings that are offset from the joints are provided as the plurality of openings serving as the inlet and outlet of the heat exchange medium . 2. The heat exchanger according to claim 1, wherein one of the two joints having a lower height is configured to be located upstream in the flow direction of the heat exchange medium in the case . . The main plate portion is formed with a step portion for reducing a gap formed between the heat transfer tube,
The heat exchanger according to claim 1 or 2 , wherein the first and second members are substantially the same in terms of arrangement, shape, and size of the stepped portion .

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