JP4041652B2 - Heat exchanger - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat exchanger provided in a combustion apparatus such as a hot water supply apparatus.
[0002]
[Prior art]
In order to achieve high thermal efficiency, a combustion apparatus such as a recovery-type combustion apparatus that recovers latent heat from combustion gas that has passed through a primary heat exchanger using a secondary heat exchanger has been conventionally provided.
In the secondary heat exchanger or the like, a flexible heat receiving pipe is used. In this case, the flexible heat receiving pipe is welded and fixed to only one side wall of the case and cantilevered. There are many cases.
[0003]
[Problems to be solved by the invention]
However, in the conventional heat exchanger described above, the free end side of the heat receiving pipe that is cantilevered easily vibrates with respect to vibration caused by a water hammer or the like that occurs when hot water is used, and therefore the weld fixing portion of the heat receiving pipe is cracked. There was a concern about the occurrence of noise or the like or the generation of noise due to vibration.
[0004]
Therefore, the present invention eliminates the problems of the conventional heat exchanger described above, and features a heat exchanger that can fix the heat receiving pipe to the case only at both connection ends of the incoming and outgoing water or a heat exchanger that cantilever-supports the heat receiving pipe. Of the heat exchanger that suppresses the vibration generated in the heat receiving pipe while suppressing the secular cracks generated in the welded portion of the heat receiving pipe to improve durability and reduce noise due to vibration. Offering is an issue.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, according to the heat exchanger of the present invention, the heat exchanger includes at least a heat receiving pipe unit for heat exchange and a case that accommodates the heat receiving pipe unit therein, and the heat receiving member that is accommodated in the case. The pipe unit is a heat exchanger that is fixed to and supported by the side wall of the case only at both connection ends of the inlet connection end and the outlet connection end, and the heat receiving pipe in the case The elastic holding piece attached directly or indirectly to the case is urged to be placed in contact with the unit from below and the combustion gas induction partition plate is brought into contact with the unit from above and is sandwiched. This is the first feature.
The heat exchanger of the present invention, in addition to the first feature, the elastic retaining piece provided with a protrusion for reducing a contact area between the heat receiving pipe unit is provided with a drain hole for drainage Is the second feature.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view of a heat exchanger according to an embodiment of the present invention with a lower portion removed, seen from below, FIG. 2 is a side view of the heat exchanger, and FIG. 3 is a top wall of the heat exchanger and a heat receiving pipe unit. FIG. 4 is a cross-sectional view taken along the line A-A in FIG. 3 and shows a state in which the heat receiving pipe unit is incorporated, FIG. 5 is a plan view of the lower plate of the heat exchanger, and FIG. FIG. 7 is a plan view of the elastic holding piece, FIG. 8 is a side view of the elastic holding piece, and FIG. 9 is another perspective view of the heat exchanger removed from below. is there.
[0007]
The heat exchanger case 10 has four side walls 11 and a top wall 12, and receives combustion gas rising from below. Therefore, the bottom surface of the case 10 is not covered with the bottom wall.
In this embodiment, the heat receiving pipe unit 20 accommodated in the case 10 uses two heat receiving pipes 21 and 22 for two circuits as a pair, but one end of the water receiving connection end. 21a and 22a and the connecting end portions 21b and 22b for hot water which are the other ends are fixed to the same one side wall 11 of the case 10 so that they can be connected to a water flow pipe outside the case 10.
On the other hand, zigzag pipe portions 21c and 22c are formed between the water connection end portions 21a and 22a and the hot water connection end portions 21b and 22b.
Of course, in the above description, the heating circuit is two circuits, but the same applies to one circuit or three circuits. In the case of one circuit, there is one heat receiving pipe (21 or 22), which is composed of a connecting end portion for incoming water (21a or 22a), a connecting end portion for hot water (21b or 22b), and a zigzag pipe portion (21c or 22c). Will be.
The heat receiving pipes 21 and 22 may be bellows-like flexible pipes.
[0008]
Below the heat receiving pipe unit 20 in the case 10, a lower plate 30 of the heat exchanger, a drain receiving plate 40 of the heat exchanger, and an elastic holding piece 50 are provided. A combustion gas induction partition plate 60 is provided from the upper side of the heat receiving pipe unit 20 to one side.
[0009]
3 and 5, the lower plate 30 is fixed to the side wall 11 adjacent to the side plate 11 to which the heat receiving pipe unit 20 is attached at a vertically bent portion 31 at the base end thereof. Has been.
The main body 32 of the lower plate 30 includes a horizontal portion 32a following the vertical bent portion 31, a gentle inclined portion 32b, a steep inclined portion 32c, and a folded portion 32d at the tip.
Combustion gas from below is guided to the front end side along the inclination of the back surface side of the main body 32, and is guided to the space where the heat receiving pipe unit 20 is arranged as indicated by an arrow P.
A drain pipe 70 is connected to the center of the horizontal portion 32a. The drain receiving plate 40 and the elastic holding piece 50 are spot-welded to the horizontal portion 32a.
[0010]
The drain receiving plate 40 is a plate that receives the drain generated by the heat receiving pipe unit 20 or the like, and is spot welded to the hill portion of the horizontal portion 32 a of the main body 32 of the lower plate 30 by the attachment piece 41.
The main body 42 of the drain receiving plate 40 is arranged so as to have a gap with respect to the lower plate 30, and is composed of a gently inclined portion 42a and a steeply inclined portion 42b. The tip of the steeply inclined portion 42b is disposed so as to accommodate the side end of the heat receiving pipe unit 20 inside.
The drain received by the drain receiving plate 40 flows along the inclination on the main body 42, and is drawn downward from the drain removing pipe 70 connected to the lower plate 30.
[0011]
A pair of the elastic holding pieces 50 are provided in this embodiment. The elastic holding piece 50 is spot-welded to the attachment piece portion 41 of the drain receiving plate 40 at the attachment piece portions 51 on both ends.
The elastic holding piece 50 fixed to the drain receiving plate 40 as described above further includes the drain receiving plate 40 being fixed to the lower plate 30 and the lower plate 30 being further fixed to the side wall 11 of the case 10. This is substantially the same as cantilevered on the side wall 11 of the case 10. The elastic holding piece 50 may be directly attached to a part of the case 10.
The main body 52 of the elastic holding piece 50 is provided with a contact portion 52a that comes into contact with the heat receiving pipe unit 20 from below. In the present embodiment, the contact portion 52 a is configured as two horizontal regions in accordance with the shape of the heat receiving pipe unit 20. Each contact portion 52a abuts against the heat receiving pipes 21 and 22 corresponding to two from the bottom, and is biased upward by the elasticity it has.
The elastic holding piece 50 can be made of a metal material or a non-metallic material adjusted so as to maintain elasticity with respect to the heat receiving pipe unit 20 and to maintain the contact state. The tip of the elastic holding piece 50 is bent obliquely upward so that the heat receiving pipe can be easily held.
One or more protrusions 53 for reducing the contact area with the heat receiving pipe unit 20 are provided on the upper surface of the contact portion 52a of the main body 52 of the elastic holding piece 50. By providing this convex portion 53, a gap is formed between the heat receiving pipe and the elastic holding piece 50 at a place other than the convex portion 53 to avoid mutual contact and to prevent deterioration of the heat receiving pipe due to corrosion or the like. ing.
Further, the main body 52 of the elastic holding piece 50 is provided with a plurality of drain holes 54 in the contact portion 52a and other upward surfaces so that the drain does not collect in the elastic holding piece 50.
[0012]
The induction partition plate 60 serves to guide the combustion gas that has been guided to the space in which the heat receiving pipe unit 20 is disposed to the exhaust gas collecting path 80 through the space between the heat receiving pipes 21 and 22, and hot water supply. The top wall 12 of the vessel is isolated from the hot air of the combustion gas, and the exhaust gas collecting path 80 is disposed from the entire upper part of the heat receiving pipe unit 20 to one side of the adjacent heat receiving pipe unit 20. . One side of the heat receiving pipe unit 20 is a boundary wall with the exhaust gas collecting path 80.
[0013]
The heat receiving pipe unit 20 is cantilevered on one side wall 11 of the case 10 and is contacted and urged from below by the pair of elastic holding pieces 50 along the way to the free end thereof, so that the guide partition plate 60 It is held stably in a form sandwiched between the two.
When vibration is applied to the heat receiving pipe unit 20, it tends to vibrate greatly on the free end side of the heat receiving pipe unit 20, but since this vibration is absorbed by the elastic holding piece 50, noise is generated due to vibration. It is reduced or prevented, and the occurrence of breakage such as cracks in the welded portion in the cantilever fixing portion due to vibration is reduced or prevented.
[0014]
The heat receiving pipes 21 and 22 of the heat receiving pipe unit 20 are bent in a zigzag so that most of the heat receiving pipes 21 and 22 meander in the horizontal direction, but in some places also bend in the vertical direction. Thus, the difference in height between the connecting end portions 21a and 22a for incoming water and the connecting end portions 21b and 22b for hot water is corrected.
On the other hand, in the present embodiment in which the two heat receiving pipes 21 and 22 are paired to form the heat receiving pipe unit 20, in order to form the two zigzag heat receiving pipes 21 and 22 as a unit compactly, one heat receiving pipe is used. 22, the position and the meandering length of the vertical meandering portion V are adjusted so that they are fitted between the horizontal meandering portions H of the other heat receiving pipe 21. As a result, the heat receiving pipe unit 20 itself can be configured in a very compact manner, and the vertical relationship of the heat receiving pipes 21 and 22 at the incoming connection end portions 21a and 22a is the same as that at the outlet end connecting end portions 21b and 22b. It is possible to adjust the arrangement relationship between the heat receiving pipes 21 and 22 so as to be opposite in the vertical relationship, and the heat exchange efficiency in the heat receiving pipes 21 and 22 can be easily adjusted.
[0015]
In the above description, the case where the heat receiving pipe unit 20 is cantilevered on the one side wall 11 of the case 10 has been described, but the present invention is not limited to this. For example, even when fixed to two opposing side walls of the case, a sufficient effect can be obtained when the fixed heat receiving pipe is a pipe having a large degree of freedom of deformation such as a flexible pipe.
[0016]
【The invention's effect】
The present invention comprises the above configuration and action, and according to the heat exchanger according to claim 1, the heat exchanger has at least a heat receiving pipe unit for heat exchange, and a case for accommodating the heat receiving pipe unit therein, The heat receiving pipe unit accommodated in the case is a heat exchanger that is fixedly supported on the side wall of the case only by both connection ends of the incoming connection end and the outgoing connection end. The elastic holding piece attached directly or indirectly to the case is urged to be in contact with the heat receiving pipe unit in the case and the combustion gas induction partition plate is contacted from above. Because it is pinched,
While maintaining the advantage of supporting the heat receiving pipe unit only at both the connecting end of the incoming water connection and the connecting end of the hot water, the vibration generated in the heat receiving pipe unit is suppressed, and the fixing portion of the heat receiving pipe unit is used. It is possible to suppress the occurrence of aged cracks and the like that occur and to achieve durability, and to reduce noise due to vibration .
In particular, the heat receiving pipe unit can be stably held by the elastic holding piece from the bottom and the guide partition plate from the top, suppressing vibration more effectively and reducing the occurrence of noise and cracks in the fixed part. be able to.
Moreover, according to the heat exchanger of Claim 2 , in addition to the effect by the structure of the said Claim 1, while providing the convex part for reducing a contact area with a heat receiving pipe unit in an elastic holding piece, Because there is a drain hole,
Corrosion deterioration that is likely to occur when the heat receiving pipe unit comes into contact with the elastic holding piece can be suppressed, and drainage can be prevented from accumulating in the elastic holding piece.
[Brief description of the drawings]
FIG. 1 is a perspective view of a state where a lower portion of a heat exchanger showing an embodiment of the present invention is removed as viewed from below.
FIG. 2 is a side view of the heat exchanger.
FIG. 3 is a plan view of the heat exchanger with the top wall and the heat receiving pipe unit removed, as viewed from above.
4 is a view showing a state in which a heat receiving pipe unit is incorporated in the AA sectional view of FIG. 3; FIG.
FIG. 5 is a plan view of a lower plate of the heat exchanger.
FIG. 6 is a plan view of a drain receiving plate of the heat exchanger.
FIG. 7 is a plan view of an elastic holding piece.
FIG. 8 is a side view of an elastic holding piece.
FIG. 9 is another perspective view of the heat exchanger as viewed from below with the lower part removed.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Case 11 Side wall 12 Top wall 20 Heat receiving pipe unit 21, 22 Heat receiving pipe 21a, 22a Incoming connection end 21b, 22b Outlet connecting end 21c, 22c Zigzag pipe part 30 Heat exchanger lower plate 40 Drain receiving plate 50 Elastic holding piece 51 Attachment piece part 52 Main body 53 Convex part 54 Drain hole 60 Guide partition plate 70 Drain pipe 80 Exhaust gas collecting path H Horizontal meander part V Vertical meander part

Claims (2)

It has at least a heat receiving pipe unit for heat exchange and a case for accommodating the heat receiving pipe unit therein, and the heat receiving pipe unit accommodated in the case has a connection end portion for incoming water and a connection end portion for hot water. A heat exchanger that is fixed and supported on the side wall of the case only at both connection ends, and is directly or indirectly attached to the case with respect to the heat receiving pipe unit in the case. A heat exchanger in which an elastic holding piece is urged and disposed in a contact state from below and a combustion gas induction partition plate is brought into contact from above and sandwiched . 2. The heat exchanger according to claim 1, wherein the elastic holding piece is provided with a convex portion for reducing a contact area with the heat receiving pipe unit and a drain hole .

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