JP5516075B2 - Plate heat exchanger - Google Patents

Description

  The present invention relates to a plate heat exchanger that is configured by laminating a plurality of heat exchange plate bodies and is employed in various devices such as a water heater and a water heater.

  Conventionally, for example, Patent Document 1 discloses a channel structure (plate heat exchanger) having a fine flow path. In this plate heat exchanger, a first section (first flow path) through which a heat exchange medium (first fluid) is circulated using a flow path corrugated plate having a fine pattern formed by press working to form a fine flow path. ) And second sections (second flow paths) through which the heat exchange medium (second fluid) flows are alternately formed. Further, in this plate heat exchanger, the stacking interval of the heat exchange plates (flow path height) is determined by the height of the embossed portion and the thickness of the header plate when the uneven embossed portions of the plurality of heat exchange plates are overlapped. ).

JP 2004-261911 A

  In the heat exchange plate of the plate heat exchanger, a plurality of convex and concave corrugations are generally formed by press working as a heat transfer surface. For this reason, it is difficult to suppress warping, and warping occurs. The plate type heat exchanger has a structure in which a plurality of heat exchange plates in which warpage has occurred are stacked and joined by brazing using a hard solder such as copper, so that the heat exchange plate warps during brazing. It is necessary to correct. In order to correct such warpage, it is common to use pressure brazing performed in a state where a predetermined post portion is pressurized.

  When a large pressure is applied to the support column when performing the above-described pressure brazing, the surface of the support column may be cracked. The plate heat exchanger is required to be configured so that a state where the first flow path and the second flow path communicate with each other (so-called cross connection) does not occur when a crack occurs in the support column. .

  The present invention has been made to solve the above-described problems. When the support column is cracked, the first flow path and the second flow path are in communication (so-called cross connection). It is an object of the present invention to provide a plate heat exchanger capable of avoiding the above.

The plate heat exchanger according to the present invention is configured by laminating a plurality of heat exchange plate bodies formed by joining first and second heat exchange plates having a concave cross-sectional shape, a convex cross-sectional shape, or a concave-convex cross-sectional shape. Plate heat exchanger, formed between the first heat exchange plate and the second heat exchange plate, and formed between the first flow path through which the first fluid flows and the adjacent heat exchange plate body. A second flow path through which the second fluid flows, and a support column that receives pressure when brazing the plate heat exchanger, and the support column includes a first heat exchange plate and a second heat exchange plate. is a superimposed form, and both the first and second fluids have a pocket structure which does not flow, strut is constituted by a pocket structure laminated in a straight line, pocket structure those height is greater than the height of the first flow path A.

  According to the present invention, there is provided a plate heat exchanger capable of avoiding a state where the first flow path and the second flow path communicate with each other (so-called cross connection) when a crack occurs in the support column. Can be provided.

It is an external view (A) of a plate type heat exchanger in Embodiment 1 of the present invention, and (B). It is sectional drawing which cut | disconnected the plate type heat exchanger in the AA surface in FIG. 1 (A). It is a figure (A), (B), and (C) for demonstrating the structure of the support | pillar part of the plate type heat exchanger shown in FIG. It is a figure (A) for explaining the composition of the plate type heat exchanger in Embodiment 2 of the present invention (B).

  Hereinafter, embodiments of a plate heat exchanger according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiment described below.

Embodiment 1 FIG.
FIG. 1 is an external view of a plate heat exchanger 1 according to Embodiment 1 of the present invention. More specifically, FIG. 1A is an overall view of the plate heat exchanger 1, and FIG. 1B is an enlarged view showing the vicinity of the outlet portions 4 and 5 of the plate heat exchanger 1. FIG. Moreover, FIG. 2 is sectional drawing which cut | disconnected the plate type heat exchanger 1 in the AA surface in FIG. 1 (A).

  The plate heat exchanger 1 in the present embodiment can be employed in various devices such as a water heater and a water heater. Here, in a hot water storage hot water supply device (not shown) that can supply hot water to the bathtub, the plate heat exchanger 1 circulates high-temperature tank hot water stored in the hot water storage tank and a heat insulation circuit for heat insulation of the bathtub. The structure applied as a heat exchanger which heat-exchanges with bath water (2nd fluid) is illustrated.

  As shown in FIG. 1, the plate heat exchanger 1 has a heat exchange plate 10 facing a heat exchange plate body 10 formed by joining a first heat exchange plate 101 and a second heat exchange plate 102 having a concavo-convex cross section. In this state, a plurality of sheets are laminated. Each of the first heat exchange plate 101 and the second heat exchange plate 102 is brazed with a copper brazing so that hermeticity is maintained. Further, the heat exchange plate bodies 10 which are joined bodies of these heat exchange plates 101 and 102 are similarly brazed with copper brazing, so that airtightness is maintained.

  The plate heat exchanger 1 is used vertically. As shown in FIG. 1, a plate-type heat exchanger 1 has an upper portion of a plate-type heat exchanger 1 and a first inlet portion 2 that is an inlet portion of a first fluid (for example, tank hot water) that is a heat exchange medium and a first heat exchanger medium. The 2nd exit part 3 which is an exit part of 2 fluids (for example, bath water) is being fixed by brazing, respectively. Further, a first outlet portion 4 that is an outlet portion of the first fluid and a second inlet portion 5 that is an inlet portion of the second fluid are respectively fixed to the lower portion of the plate heat exchanger 1 by brazing. ing.

  As shown in FIG. 2, a plurality of convex portions 10 a and concave portions 10 b are alternately formed on each of the first heat exchange plate 101 and the second heat exchange plate 102. The first heat exchange plate 101 and the second heat exchange plate 102 are in contact with each other at a contact portion 10c between the concave portion 10b of the first heat exchange plate 101 and the convex portion 10a of the second heat exchange plate 102. Are joined by brazing (the other contact parts are also joined by another brazing). Between the first heat exchange plate 101 and the second heat exchange plate 102 joined in this way, the first flow path 11 through which the first fluid from the first inlet portion 2 toward the first outlet portion 4 flows. Is formed.

  Further, as shown in FIG. 2, the adjacent heat exchange plate bodies 10 include the first heat exchange plate 101 and the convex portions 10 a of the second heat exchange plate 102, and the first heat exchange plate 101 and the second heat. The recesses 10b of the exchange plate 102 are stacked such that they are not in contact with each other. Between the heat exchange plate bodies 10 stacked in this way, a second flow path 12 is formed through which the second fluid flows from the second inlet portion 5 toward the second outlet portion 3.

  FIG. 3 is a view for explaining the structure of the support column 13 of the plate heat exchanger 1 shown in FIG. More specifically, FIG. 3 (A) is a diagram showing the installation location of the column part 13, and FIG. 3 (B) and FIG. 3 (C) are cross-sectional views showing the configuration around the column part 13, respectively.

  In the example shown in FIG. 3A, the support column portions 13 are provided at three locations in the center of the plate heat exchanger 1. This support | pillar part 13 is a site | part which receives the pressurizing force 20 at the time of brazing of the plate-type heat exchanger 1, as shown in FIG.3 (B). The column portion 31 of the present embodiment includes a bag structure portion 14 formed by overlapping a convex portion 14a formed on the first heat exchange plate 101 side and a concave portion 14b formed on the second heat exchange plate 102 side. I have. This bag structure part 14 is comprised as a site | part which neither a 1st fluid nor a 2nd fluid distribute | circulates.

  Further, as shown in FIG. 3C (and FIG. 2), the support column portion 13 of the present embodiment is configured by laminating the bag structure portions 14 formed on the heat exchange plate bodies 10 in a straight line. ing. Further, as shown in FIGS. 3B and 3C, the bag structure portion 14 is formed such that its height A is larger than the height B of the first flow path 11.

  As described above, the column portion 13 of the present embodiment is formed by overlapping the first heat exchange plate 101 and the second heat exchange plate 102, and neither the first fluid nor the second fluid flows. It is comprised as a laminated body of the bag structure part 14. As a result, when the pressurizing force 20 is applied to the support column 13 during brazing, even if a crack occurs on the surface 13a of the support column 13 shown in FIG. It is only necessary for the second fluid to flow into the bag structure portion 14. That is, it is possible to avoid a state where the first flow path 11 and the second flow path 12 communicate with each other (so-called cross connection).

  Further, the column portions 13 are configured by laminating the bag structure portions 14 formed on the heat exchange plate bodies 10 in a straight line. Thereby, the pressure 20 at the time of brazing can be transmitted to all the heat exchange plate bodies 10.

  In the prior art, the flow path height of the plate heat exchanger is defined by the height of the embossed portion and the thickness of the header plate. On the other hand, according to the configuration of the present embodiment, as shown in FIG. 3B, the header plate is formed by making the height A of the bag structure portion 14 larger than the height B of the first flow path 11. The channel height of the second channel 12 can be determined without using the.

Embodiment 2. FIG.
FIG. 4 is a diagram for explaining the configuration of the plate heat exchanger 30 according to Embodiment 2 of the present invention. More specifically, FIG. 4 (A) is an enlarged view showing the vicinity of the outlet portions 4 and 5 of the plate heat exchanger 30 and FIG. 4 (B) is an enlarged view of B in FIG. 4 (A). It is sectional drawing which cut | disconnected the plate type heat exchanger 30 in the -B surface.

  As shown in FIG. 4 (A), the plate heat exchanger 30 of the present embodiment has a column portion in the vicinity of each of the first outlet portion 4 and the second outlet portion 5 in addition to the column portion 13 described above. 31 is provided. As shown in FIG. 4B, the support column 31 is configured by laminating a bag structure unit 32 similar to the bag structure unit 14 included in the support column 13.

  More specifically, the bag structure portion 32 is formed by overlapping a convex portion 32a formed on the first heat exchange plate 101 and a concave portion 32b formed on the second heat exchange plate 102, and It is configured as a portion where neither the first fluid nor the second fluid flows. Further, as shown in FIG. 4B, the column portion 31 is also configured by laminating the bag structure portions 32 formed on the heat exchange plate bodies 10 in a straight line.

  According to the plate-type heat exchanger 30 of the present embodiment described above, the post portion 31 is provided in the vicinity of the outlet portions 4 and 5 for the first fluid and the second fluid, so that the pressure 20 during brazing is increased. The bending of the heat exchange plate body 10 due to can be suppressed. Thereby, improvement of brazing joint failure can be aimed at. In addition, since the shape of the support 31 is configured like a bag structure 32 as shown in FIG. 4B, a crack is generated on the surface of the support 31 when the applied pressure 20 is applied to the support 31. Even in this case, the second fluid flowing through the second flow path 12 only needs to flow into the bag structure portion 32. For this reason, it becomes possible to more effectively avoid the state in which the first flow path 11 and the second flow path 12 communicate with each other in the entire plate heat exchanger 30 (so-called cross connection).

  Moreover, since the support | pillar part 31 is also comprised by laminating | stacking the bag structure part 32 formed in each heat exchange plate body 10 on the straight line similarly to the support | pillar part 13, all the pressurizing force 20 at the time of brazing is comprised. The heat exchange plate body 10 can be transmitted.

  By the way, in Embodiment 2 mentioned above, it demonstrated taking the case where the said support | pillar part 31 was provided in the vicinity of each of the 1st exit part 4 and the 2nd exit part 5 as an example. However, the installation location of the column portion in the present invention is not limited to this, and the inlet portion of the first channel, the outlet portion of the first channel, the inlet portion of the second channel, and the outlet portion of the second channel. It suffices if it is in the vicinity of at least one of them.

  Moreover, in Embodiment 1 and 2 mentioned above, it demonstrated taking the case of the 1st heat exchange plate 101 and the 2nd heat exchange plate 102 in which the some convex part 10a and the recessed part 10b were formed alternately. However, the first and second heat exchange plates according to the present invention have the uneven cross-sectional shape as described above as long as the first flow path is formed between them by joining them. It is not limited to a thing, You may have a concave cross-sectional shape or a convex cross-sectional shape.

DESCRIPTION OF SYMBOLS 1, 30 Plate type heat exchanger 2 1st inlet part 3 2nd outlet part 4 1st outlet part 5 2nd inlet part 10 Heat exchange plate body 101 1st heat exchange plate 102 2nd heat exchange plate 10a Heat exchange plate 101 , 102 convex portion 10b Heat exchange plates 101, 102 concave portion 10c Contact portion 11 First flow path 12 Second flow path 13, 31 Strut portion 14, 32 Bag structure portion 14a, 32a Convex portion 14b, 32b of bag structure portion Concave part of bag structure

Claims (2)

A plate-type heat exchanger configured by laminating a plurality of heat exchange plate bodies formed by joining first and second heat exchange plates having a concave cross-sectional shape, a convex cross-sectional shape or a concave-convex cross-sectional shape,
A first flow path formed between the first heat exchange plate and the second heat exchange plate and through which the first fluid flows;
A second flow path formed between adjacent heat exchange plate bodies through which a second fluid flows;
A strut that receives pressure when brazing the plate heat exchanger,
With
The strut is formed by superposing the second heat exchange plate and the first heat exchange plate, and have a pocket structure that neither the flow of the first fluid and the second fluid,
The support column is configured by the bag structure unit stacked on a straight line,
The plate-type heat exchanger , wherein a height of the bag structure portion is larger than a height of the first flow path .   The strut portion having the bag structure portion includes an inlet portion of the first channel, an outlet portion of the first channel, an inlet portion of the second channel, and an outlet portion of the second channel. The plate heat exchanger according to claim 1, wherein the plate heat exchanger is provided in the vicinity of at least one.

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