heat exchange device

Abstract

A heat exchange device comprising a sensible heat exchanger 1 and a latent heat exchanger 3 positioned above the sensible heat exchanger 1 via an exhaust hood member 2 that covers the upper surface of the sensible heat exchanger 1, wherein the latent heat exchanger 3 is made up of a plurality of heat absorption pipes 32 arranged inside a box-shaped case 31, and the device is designed to prevent drain from falling into the sensible heat exchanger 1 and to enable miniaturization of the latent heat exchanger 3. [Solution] An inlet 37 is opened on the bottom surface 311 of the case 31 of the latent heat exchanger 3, positioned below the area where the heat absorption pipe 32 is located. A cover member 38 is provided in the exhaust hood member 2 so as to protrude into the case 31, covering the connecting opening 23 facing the inlet 37 from above. An opening 381 is provided in the portion of the cover member 38 that protrudes into the case 31, opening in a direction intersecting the vertical direction.

Description

Technical Field

[0001] The present invention relates to a heat exchange device including a sensible heat exchanger and a latent heat exchanger disposed above the sensible heat exchanger via an exhaust hood member that covers the upper surface of the sensible heat exchanger.

Background Art

[0002] Conventionally, in this type of heat exchange device, generally, on the bottom surface of a box-shaped case of a latent heat exchanger in which a plurality of heat absorption pipes are arranged inside, a portion deeper in the depth direction than the region where the heat absorption pipes are arranged is positioned below, an inlet is opened, and a connection port facing the inlet is opened in the exhaust hood member, so that combustion exhaust gas that has passed through the sensible heat exchanger flows into the case of the latent heat exchanger through the connection port and the inlet (see, for example, Patent Document 1).

[0003] Here, the reason for opening the inlet below the portion deeper in the depth direction than the region where the heat absorption pipes are arranged is to prevent strongly acidic drain generated by condensation of moisture in the combustion exhaust gas on the outer surface of the heat absorption pipes from falling into the sensible heat exchanger through the inlet and the connection port. However, in this case, it is necessary to bulge the case of the latent heat exchanger significantly (more than the depth dimension of the inlet) deeper in the depth direction than the region where the heat absorption pipes are arranged. Therefore, there is a problem that the latent heat exchanger becomes large-sized.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In view of the above, the object of the present invention is to provide a heat exchange device that prevents drain from falling into the sensible heat exchanger and allows for miniaturization of the latent heat exchanger. [Means for solving the problem]

[0006] To solve the above problems, the present invention provides a heat exchange apparatus comprising a sensible heat exchanger and a latent heat exchanger positioned above the sensible heat exchanger via an exhaust hood member that covers the upper surface of the sensible heat exchanger, wherein the latent heat exchanger is made up of a plurality of heat absorption pipes arranged in a box-shaped case, and an inlet is opened on the bottom surface of the case, positioned below the area where the heat absorption pipes are arranged, and a connecting port is opened in the exhaust hood member facing the inlet, and a cover member that covers the connecting port from above is provided so as to protrude into the case, and an opening is provided in the portion of the cover member that protrudes into the case, opening in a direction intersecting the vertical direction, so that combustion exhaust gas that has passed through the sensible heat exchanger flows into the case of the latent heat exchanger from the connecting port through the opening in the cover member.

[0007] According to the present invention, since the inlet on the bottom surface of the latent heat exchanger case is positioned below the area where the heat absorption pipe is located, it is not necessary to make the case of the latent heat exchanger bulge significantly inward in the depth direction beyond the area where the heat absorption pipe is located, as in the conventional example described above. Therefore, the latent heat exchanger can be made smaller. Furthermore, even if the inlet is positioned below the area where the heat absorption pipe is located, the drain dripping from the outer surface of the heat absorption pipe is received by the cover member, and the drain does not fall into the sensible heat exchanger.

[0008] Furthermore, in the present invention, the inlet is larger than the connecting port, the portion of the bottom surface of the latent heat exchanger case surrounding the inlet is seated on the portion of the exhaust hood member surrounding the connecting port, the opening edge of the connecting port is formed as a first bent edge that bends upward, and it is desirable that the lower edge of the cover member is positioned between the first bent edge and the opening edge of the inlet. This ensures that the lower edge of the cover member is positioned between the first bent edge and the opening edge of the inlet, thereby correctly securing the positional correlation between the exhaust hood member, the cover member and the case of the latent heat exchanger.

[0009] In this case, it is desirable to braze the exhaust hood member, the cover member, and the latent heat exchanger case between the first bent edge and the opening edge of the inlet. This allows the three components—the exhaust hood member, the cover member, and the latent heat exchanger case—to be fixed in the correct positional correlation, thereby improving assembly accuracy.

[0010] Furthermore, to prevent the lower edge of the cover member from shifting position by crossing over the opening edge of the inlet, it is desirable that the opening edge of the inlet be formed as a second bent edge that curves upward.

[0011] Furthermore, in this invention, it is desirable that the upper surface of the cover member contacts the lowest heat-absorbing pipe from below. This allows the heat-absorbing pipe to be supported from below by the cover member, thereby reducing the number of members required to fix the heat-absorbing pipe.

[0012] In this case, the case of the latent heat exchanger consists of a case body with an open top and a lid that closes the top of the case body. When the lid is attached to the case body, it is desirable that the bottom surface of the lid contacts the uppermost heat absorption pipe from above. This way, the heat absorption pipe is sandwiched between the lid and the cover member from above and below, further reducing the number of members that fix the heat absorption pipe. [Brief explanation of the drawing]

[0013] [Figure 1]A perspective view of a heat exchanger according to an embodiment of the present invention. [Figure 2] A cross-sectional side view of the heat exchanger according to the embodiment. [Figure 3] A perspective view of the disassembled main parts of the heat exchanger according to the embodiment. [Modes for carrying out the invention]

[0014] The heat exchange device according to the embodiment of the present invention shown in Figures 1 and 2 is for hot water supply and is installed on a combustion chamber containing a burner (not shown). This heat exchange device comprises a sensible heat exchanger 1 and a latent heat exchanger 3 positioned above the sensible heat exchanger 1 via an exhaust hood member 2 that covers the upper surface of the sensible heat exchanger 1. Hereinafter, the depth direction will be described as the front-to-back direction and the width direction as the lateral direction.

[0015] The sensible heat exchanger 1 is a fin tube type heat exchanger in which multiple pipes 13 are arranged laterally at intervals, passing through a large number of heat-absorbing fins 12 stacked in the front-to-back direction, within a shell 11 that is open on both the top and bottom. These pipes 13 are connected in series on the front and rear outer sides of the shell 11 by multiple U-shaped pipes 14. An inlet pipe 15 is connected to the upstream end (rightmost in Figure 1) of these pipes 13, and a hot water outlet pipe (not shown) is connected to the downstream end (leftmost in Figure 1).

[0016] The exhaust hood member 2 has an outer flange portion 21 that overlaps with the flange portion 111 at the upper end of the body portion 11 of the sensible heat exchanger 1, and an upwardly raised main body portion 22 surrounded by the flange portion 21.

[0017] The latent heat exchanger 3 consists of multiple heat-absorbing pipes 32 that meander laterally and extend in the front-to-back direction, stacked vertically inside a box-shaped case 31. The case 31 is composed of a case body 31a with an open top and a lid 31b that closes the top of the case body 31a. The lid 31b is fixed to the case body 31a by hemming the upper end of the case body 31a.

[0018] The front of the case 31 is provided with a horizontally elongated, double-layered cylindrical exhaust port 33. The bottom surface 311 of the case 31 is generally sloped downwards towards the front. A cylindrical drain port 34 for draining condensate is installed vertically in the lateral center of the front end of the bottom surface 311. On one lateral side of the outer surface of the case 31 are provided a water inlet header 35 and a water outlet header 36, to which the upstream front end and downstream rear end of a plurality of heat absorption pipes 32 are connected, respectively. A water supply pipe (not shown) is connected to the water inlet 351 provided in the water inlet header 35, and a connecting pipe (not shown) connected to the water inlet pipe 15 is connected to the water outlet 361 provided in the water outlet header 36.

[0019] Referring to Figure 3, an inlet 37 is provided on the bottom surface 311 of the case 31, located below the area where the heat absorption pipe 32 is positioned. Furthermore, a connecting opening 23 is provided on the upper surface of the main body portion 22, facing the inlet 37. A cover member 38 is provided to cover the connecting opening 23 from above, protruding into the case 31. The portion of the cover member 38 protruding into the case 31 is provided with an opening 381 that is open in a direction intersecting the vertical direction. Combustion exhaust gas that has passed through the sensible heat exchanger 1 flows into the case 31 from the connecting opening 23 through the opening 381 of the cover member 38. Note that in Figure 3, the latent heat exchanger 3 is shown from a diagonal downward view, and the exhaust hood member 2 and cover member 38 are shown from a diagonal upward view.

[0020] To describe the cover member 38 in more detail, it has an upper plate portion 382 that faces above the connecting opening 23, and side plate portions 383 that bend downward from the front edge and both lateral edges of the upper plate portion 382. On the other hand, instead of providing side plate portions that extend downward from the rear edge of the upper plate portion 382, ​​an open portion 381 that is open to the rear is provided. Combustion exhaust gas that passes through the open portion 381 flows from rear to front inside the case 31 and is discharged to the outside from the exhaust port 33. Also, the upper plate portion 382 extends behind the rear edge of the connecting opening 23.

[0021] If the inlet 37 on the bottom surface 311 of the case 31 of the latent heat exchanger 3 is positioned below the area where the heat absorption pipes 32 are arranged as described above, it is not necessary to bulge the case 31 significantly rearward from the area where the heat absorption pipes 32 are arranged. Therefore, the latent heat exchanger 3 can be miniaturized. Further, even if the inlet 37 is positioned below the area where the heat absorption pipes 32 are arranged, the drain dripping from the outer surface of the heat absorption pipes 32 is received by the cover member 38, and the drain does not fall into the sensible heat exchanger 1.

[0022] Also, in the present embodiment, the inlet 37 is larger in opening than the connection port 23, and the portion around the inlet 37 on the bottom surface 311 of the case 31 is seated on the upper surface of the main body portion 22 which is the portion around the connection port 23 of the exhaust hood member 2. Further, the opening edge portion of the connection port 23 is formed into a first bent edge portion 23a that bends upward, and similarly, the opening edge portion of the inlet 37 is also formed into a second bent edge portion 37a that bends upward. And the lower edge portion of the side plate portion 383 which is the lower edge portion of the cover member 38 is positioned between the first bent edge portion 23a and the second bent edge portion 37a which is the opening edge portion of the inlet 37.

[0023] Here, when assembling the latent heat exchanger 3, after placing the case main body 31a on the exhaust hood member 2, with a roll material set between the first and second bent edge portions 23a, 37a, the cover member 38 is set so that its lower edge portion is inserted between the first and second bent edge portions 23a, 37a. Next, a plurality of heat absorption pipes 32 are set in the case main body 31a such that the upstream and downstream end portions thereof are inserted through the side plate portion on one lateral side of the case main body 31a, and a paste-like roll material is applied to the insertion locations of the heat absorption pipes 32 on the side plate portion on one lateral side of the case main body 31a. Thereafter, the inlet and outlet headers 35, 36 are attached to the outer surface of the side plate portion on one lateral side of the case main body 31a, and in this state, in-furnace rolling is performed. Finally, a lid body 31b is set on the upper surface of the case main body 31a, the lid body 31b is fixed to the case main body 31a by hemming, and an exhaust port 33 is attached to the front surface of the case 31.

[0024] As described above, by positioning the lower edge of the cover member 38 between the first and second bent edges 23a and 37a, the correct positional correlation between the exhaust hood member 2, the cover member 38, and the case 31 can be ensured. Then, the exhaust hood member 2, the cover member 38, and the case 31 are brazed between the first and second bent edges 23a and 37a. This allows the three components—the exhaust hood member 2, the cover member 38, and the case 31—to be fixed in the correct positional correlation, improving assembly accuracy.

[0025] Furthermore, in this embodiment, the upper surface of the cover member 38, that is, the upper surface of the upper plate portion 382, ​​is in contact with the lowest heat absorption pipe 32 from below. Also, by attaching the lid 31b to the case body 31a, the lower surface of the lid 31b is in contact with the uppermost heat absorption pipe 32 from above. As a result, the heat absorption pipe 32 is sandwiched from above and below by the lid 31b and the cover member 38, which reduces the number of members that fix the heat absorption pipe 32. Note that if the cover member 38 is in contact with the lowest heat absorption pipe 32, the number of members that fix the heat absorption pipe 32 can be reduced to some extent even if the lid 31b is not in contact with the uppermost heat absorption pipe 32.

[0026] Although embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited thereto. For example, in the above embodiment, the opening 381 of the cover member 38 is open to the rear, but if the heat absorption pipe 32 extends laterally while meandering in the front-rear direction, and combustion exhaust gas should be flowed into the case 31 from one side to the other, the opening 381 of the cover member 38 can be opened to one side in the lateral direction.

[0027] Furthermore, it is also possible to form the opening edge of the inlet 37 as an ordinary edge that does not bend upward. However, in order to prevent the lower edge of the cover member 38 from shifting position by going over the opening edge of the inlet 37, it is desirable to form the opening edge of the inlet 37 as a second bent edge 37a that bends upward, as in the above embodiment. In addition, although the above embodiment applies the present invention to a heat exchange device for hot water supply, the present invention can be similarly applied to heat exchange devices for other purposes, such as heating. [Explanation of Symbols]

[0028] 1...Sensible heat exchanger, 2...Exhaust hood component, 23...Connecting port, 23a...First bent edge, 3...Latent heat exchanger, 31...Case, 31a...Case body, 31b...Lid, 311...Bottom surface of the case, 32...Heat absorption pipe, 37...Inlet, 37a...Second bent edge, 38...Cover component.

Claims

1. A heat exchange apparatus comprising a sensible heat exchanger and a latent heat exchanger positioned above the sensible heat exchanger via an exhaust hood member covering the upper surface of the sensible heat exchanger, wherein the latent heat exchanger is made up of multiple heat absorption pipes arranged inside a box-shaped case, A heat exchange device characterized in that an inlet is provided on the bottom surface of the case, located below the area where the heat absorption pipe is arranged, and a connecting port is provided on the exhaust hood member facing the inlet, a cover member is provided that covers the connecting port from above and protrudes into the case, and an opening is provided in the portion of the cover member that protrudes into the case, opening in a direction intersecting the vertical direction, so that combustion exhaust gas that has passed through the sensible heat exchanger flows into the case of the latent heat exchanger from the connecting port through the opening in the cover member.

2. The heat exchange apparatus according to claim 1, characterized in that the inlet opens larger than the connecting port, the portion of the bottom surface of the case surrounding the inlet is seated on the portion of the exhaust hood member surrounding the connecting port, the opening edge of the connecting port is formed as a first bent edge that bends upward, and the lower edge of the cover member is located between the first bent edge and the opening edge of the inlet.

3. The heat exchange apparatus according to claim 2, characterized in that the exhaust hood member, the cover member, and the case are brazed between the first bent edge and the opening edge of the inlet.

4. The heat exchange apparatus according to claim 2 or 3, characterized in that the opening edge of the inlet is formed as a second bent edge that bends upward.

5. The heat exchange device according to claim 1, characterized in that the upper surface of the cover member contacts the lowest heat absorption pipe among the heat absorption pipes from below.

6. The heat exchange device according to claim 5, wherein the case comprises a case body with an open top and a lid that closes the top of the case body, and when the lid is attached to the case body, the lower surface of the lid contacts the uppermost heat absorption pipe among the heat absorption pipes from above.

Images