JP5284303B2 - Plate heat exchanger - Google Patents

Description

  The present invention relates to a plate heat exchanger that is alternately formed between a heat transfer plate in which a high-temperature channel and a low-temperature channel through which a medium flows are laminated.

As a conventional plate-type heat exchanger, two heat transfer plates having a convex shape and a concave shape formed in a dogleg shape (herringbone shape), and the opposed convex stripes cross each other. The first space formed when stacked in such a manner is used as a high-temperature side flow path, and two heat transfer plates that are combined in the same manner are inverted 180 ° and stacked, thereby crossing the irregularities on the opposing surface. The second space formed so as not to have a joint portion is used as a low-temperature side flow path, and these are sequentially stacked, and the heat exchange medium containing impurities is circulated through the second space, so that the low-temperature side of the second space There is one that ensures efficient flow of heat exchange by ensuring the flowability of the heat exchange medium without depositing impurities in the flow path (see, for example, Patent Document 1).
In addition, in order to prevent incorrect stacking when the direction of stacking of the heat transfer plates is different from the upper layer to the lower layer, a notch for positioning and a notch for confirmation of knitting are provided on the flange portion of each heat transfer plate. There is something like this (see, for example, Patent Document 2).

JP 2008-121956 (first page, FIG. 6, FIG. 7) Japanese Patent Laid-Open No. 10-103883 (first page, FIGS. 1 and 2)

  When two types of heat transfer plates as described in Patent Document 1 are alternately stacked, it is an indispensable process to confirm a stacking error during assembly. Further, the conventional technique such as Patent Document 2 is an effective means for such confirmation, but confirmation of knitting by notches requires the inspector's familiarity and time for confirmation, and in the vertical direction. In this method, notches arranged at regular intervals are checked by visual inspection, and there has been a problem that a product with poor stacking may be shipped accidentally due to human factors such as omission of inspection.

The present invention has been made to solve the above-mentioned problems of the prior art, and it is easy to confirm the knitting of the laminated heat transfer plates, and the heat transfer plate of the heat transfer plate at the time of applying a load at the time of brazing. It aims at obtaining the plate type heat exchanger by which the deformation | transformation of the collar part was suppressed.
In addition, two types of heat transfer plates that are assembled in pairs are alternately reversed, and stacking mistakes are easily detected to prevent defective products from being generated and plate-type heat exchange with stable quality. The purpose is to obtain a vessel.

Plate heat exchanger according to this inventions is wavy irregularities are formed in the central portion, the peripheral portion to the sealing portion and sealing a predetermined number of flange portion that extends outward is formed from portions of the heat transfer A plate type heat exchanger in which heat plates are stacked and internal spaces between adjacent heat transfer plates are alternately used as a low temperature side flow path and a high temperature side flow path in the stacking direction, in the stacking direction of the heat transfer plates A bent portion is provided at an end portion of the odd-numbered or even-numbered flange portion , the flange portion extends in the extending direction of the heat transfer plate, and the bent portion of the flange portion is It extends perpendicularly to the extending direction of the heat transfer plate .

According to this inventions, it becomes easy to prevent the knitting mistakes of the heat transfer plates constituting the plate heat exchanger, moreover, bent portion of the flange portion provided on the heat transfer plate extends the heat transfer plate The plate-type heat exchanger can be provided with a stable quality because it extends perpendicularly to the current direction and deformation of the flange portion of the heat transfer plate is suppressed when a load is applied during brazing.

The circuit block diagram which shows an example when using the plate type heat exchanger which concerns on Embodiment 1 of this invention as a hot-water supply apparatus which has the additional cooking function of a bathtub. The perspective view which shows the external appearance outline | summary of the plate type heat exchanger which concerns on Embodiment 1 of this invention. The expanded view of the plate type heat exchanger shown by FIG. FIG. 4 is a cross-sectional end view in a stacked state corresponding to an arrow view taken along line IV-IV in FIG. 3. FIG. 5 is a cross-sectional end view in a stacked state corresponding to an arrow view taken along line VV in FIG. 3. It is a figure which shows the principal part of the plate type heat exchanger which concerns on the modification of Embodiment 1, and is a cross-sectional end view equivalent to FIG. It is a figure which shows the principal part of the plate-type heat exchanger which concerns on Embodiment 2 of this invention, and is sectional drawing in the lamination | stacking state equivalent to the arrow view in the VII-VII line of FIG. The expanded view which shows the arrangement | positioning of the recessed part and convex part for a misstacking detection provided in the collar part of the heat-transfer plate shown by FIG. The area | region designation | designated drawing on a collar part when providing the recessed part and convex part which are shown in FIG. 8 in an odd-numbered heat-transfer plate. The area | region designation | designated drawing on a collar part when providing the recessed part and convex part which are shown in FIG. 8 in an even-numbered heat-transfer plate.

Embodiment 1 FIG.
FIG. 1 is a circuit configuration diagram showing an example when the plate heat exchanger according to Embodiment 1 of the present invention is used as a hot water supply device having an additional cooking function for a bathtub. In the figure, the hot water supply apparatus includes a heat pump circuit 1 and a tank unit 2. The heat pump circuit 1 is configured by connecting a compressor 11, a radiator 12, an expansion valve 13, and an evaporator 14 through pipes 15 and 16 in order. The tank unit 2 includes a hot water storage tank 21 and a plate heat exchanger 300. The hot water storage tank 21 can store high-temperature water supplied from the heat pump circuit 1 through the pipe 22 in the upper part, store low-temperature water in the lower part, and can be circulated by the circulation pump 24 through the pipe 23 in the heat pump circuit 1. Thus, a stacked hot water storage tank that is stored separately for each temperature layer is used.

  The plate heat exchanger 300 according to the first embodiment has an external shape as shown in the perspective view of FIG. 2, and has a plurality of heat transfer structures in which wavy irregularities 31 are formed to increase the heat transfer area. A stack of plates 3 is used in a vertical arrangement. The plate heat exchanger 300 has a first flow path 301 and a second flow path 302. The first flow path 301 supplies high-temperature water stored in the upper part of the hot water storage tank 21 to the upper high-temperature side inlet 301a via the pipe 25, discharges it from the lower high-temperature side outlet 301b, and pipes the circulation pump 26. It is formed so as to return to the lower part of the hot water storage tank 21 through 27. The second flow path 302 supplies the low-temperature water from the bathtub 4 to the lower low-temperature side inlet 302 a via the pipe 41 by the circulation pump 42, discharges it from the upper low-temperature side outlet 302 b, and passes through the pipe 43. It is formed by returning to the bathtub 4. In this way, the first flow path 301 and the second flow path 302 are heat-exchanged by the plate heat exchanger 300 to have a function of additionally cooking the bathtub water of the bathtub 4.

  3 is a development view of the plate heat exchanger 300 shown in FIG. 2, FIG. 4 is a sectional end view taken along line IV-IV in the stacked state of FIG. 3, and FIG. 5 is a stacked state of FIG. The arrow cross-sectional end view in the VV line | wire is shown. The heat transfer plate 3 has a substantially rectangular plate shape as shown in FIGS. 3 and 4, and a wavy uneven portion 31 is formed in the central portion constituting the heat transfer surface, and the peripheral portion is sealed as shown in FIG. A portion 32 and a flange portion 33 extending outward from the sealing portion 32 are formed. In the plate heat exchanger 300, a predetermined number of the heat transfer plates 3 are stacked, and a contact including the sealing portion 32 between the heat transfer plates 3, 3,. By doing so, water tightness, air tightness and water pressure resistance are maintained.

  Hereinafter, for convenience, the heat transfer plate 3 is referred to as a first plate 3a, a second plate 3b, a third plate 3c, and a fourth plate 3d in order from the top to the bottom of FIG. Called the final plate 3e. The plate heat exchanger 300 is formed by repeatedly laminating a pair of the first plate 3a and the second plate 3b that form the first flow path (here, the high temperature side flow path) 301. FIG. As shown, any number of pairs are stacked by repeating the first pair P1 of the first plate 3a and the second plate 3b from the top, then the second pair P2 of the third plate 3c and the fourth plate 3d, and the bottom layer In this example, the final plate 3e having no high temperature side entrance and no low temperature side entrance is used as the heat transfer plate disposed below the fourth pair P4. The configuration of the third pair P3 is the same as that of the first pair P1, and the stacking direction is the same.

  The heat transfer plate 3 has a convex top 31a (FIG. 4) or a concave bottom 31b (FIG. 4) forming a wavy uneven portion 31 at a central portion with respect to the channel direction A indicated by an arrow in FIG. It is formed so as to be a “<” shape or an inverted “<” shape. In the case of the first pair P1, if the upper first plate 3a is a U-shape, the lower second plate 3b is arranged in an inverted shape. As a result, the top portions 31a of the waves (projections) of the heat transfer plate 3 facing each other in the first flow path 301 on the high temperature side intersect each other and have a contact B at the intersection as shown in FIG. Thus, a channel space with a constant interval can be formed.

  On the other hand, as shown in FIG. 4, the second flow path (low temperature side flow path) 302 is constituted by a space formed between a pair of stacked bodies forming the high temperature side first flow path 301. When the second plate 3b that forms the lower side of the first pair P1 that forms the first flow path 301 positioned on the upper side is in the reverse character direction, the first flow path 301 on the lower temperature side that is positioned below the second plate 3b. When the third plate 3c that constitutes the upper side of the second pair P2 forming the reverse direction is also in the opposite direction, the second flow path 302 on the low temperature side formed between the first pair P1 and the second pair P2 is The opposite heat transfer plates, for example, the wave top portions 31a of the second plate 3b and the third plate 3c do not come into contact with each other, and it is possible to suppress clogging of the flow path due to adhesion of dust such as hair, slime adhesion, and scale adhesion. .

  The first plate 3a is disposed by rotating 180 ° with respect to the center 5 as a third plate 3c, and the second plate 2b is disposed with being inverted 180 ° with respect to the center 5. This is the fourth plate 4d. Therefore, the press die for forming the wave-like irregularities 31 is basically composed of two types, one for the first plate 3a and one for the second plate 3b.

  As shown in FIG. 4, the space between the first plate 3a and the second plate 3b forming a pair, and the space between the third plate 3c and the fourth plate 3d are the first flow paths 301, For convenience, the crossing points are shown. On the other hand, the second flow path 302 is formed by a space between the heat transfer plate 3b and the heat transfer plate 3c. Since the phase of the unevenness 31 of each adjacent heat transfer plate 3 is the same, the second flow path 302 has a structure that does not have a contact for maintaining the interval between the adjacent heat transfer plates 3 and 3. .

  Therefore, a projecting support portion 34 for providing a contact in the second flow path 302 is formed at a predetermined portion of each heat transfer plate 3, and the support portions 34 and 34 are brought into contact with each other at the time of stacking. Thus, the contact portion C is formed to function so as to maintain the interval between the second flow paths 302. As shown in FIG. 3, the support portion 34 is separated from the center portion of the heat transfer plate 3 in the vertical direction of the drawing in two places, and in the center of the long side portion in the vicinity of the circumference, there are four places in total. Is provided. In addition, about the structure which connects the 1st flow path 301 and the 2nd flow path 302 to each entrance / exit (301a and 301b and 302a and 302b), since it is a part which can be comprised completely like the past, illustration and description are possible. Omitted.

  As described above, a plate heat exchanger 300 is obtained by laminating a plurality of heat transfer plates 3 (3a, 3b,..., 3e) which are knitted in pairs and alternately rotated by 180 °. The typical features of the first embodiment of the present invention, which were invented in order to prevent deterioration in function and quality that occur when a knitting error occurs during the stacking process, are described below with reference to FIG. More specific description will be given with reference to FIG.

  First, FIG. 5 is a diagram for explaining a characteristic portion according to the first invention described in claim 1, and is a cross-sectional view in a laminated state corresponding to the arrow view taken along the line V-V shown in FIG. It is an end view. In the figure, the stacked heat transfer plates 3 constituting the plate heat exchanger 300 are the first plate 3a on the upper side of the first pair P1 to the fourth pair P4 forming the first flow path 301 on the high temperature side, the first plate 3a. The bent portion 33a is provided only on the three plates 3c, that is, the flange portions 33 of the odd-numbered heat transfer plates 3 from the top to the bottom in the drawing. And the bending part 33a is bent in the direction of the adjacent even-numbered collar part 33, and the front-end | tip part is extended and formed to the protrusion edge part vicinity of this adjacent even-numbered collar part. The second flow path is not shown in the figure because it is outside the range of the illustrated area.

  In Embodiment 1 which concerns on 1st invention comprised as mentioned above, when the plate-type heat exchanger 300 which consists of a laminated body is seen from a side surface direction, it is the predetermined width extended in the direction orthogonal to a lamination direction. By visually inspecting that the end surfaces of the bent portions 33a and the space portions D formed between the adjacent bent portions 33a are alternately arranged regularly in the stacking direction, the first pair P1 and Since the abnormality of whether or not the second pair P2 is alternately and regularly stacked is confirmed, the stacking abnormality is detected rather than confirming that small marks such as notches are regularly arranged in the stacking direction at regular intervals. It can be easily detected.

  For this reason, it becomes possible to reliably prevent a mistake in the configuration of the pair of the upper first and third plates 3a and 3c and the lower second, fourth and final plates 3b, 3d and 3e during assembly. It was. Further, since the bent portion 33a is provided, the shape of the flange portion 33 is stabilized and the rigidity is increased, so that the load is applied perpendicularly to the flat portion E (FIG. 5) of the flange portion 33. Deformation of the flange 33 is suppressed. For this reason, when brazing the laminated heat transfer plates 3, deformation of the flange 33 due to a load applied perpendicular to the flat portion E is suppressed, and watertightness between the laminated heat transfer plates 3 is suppressed. And airtightness can be obtained with high quality. In addition, although the said bending part 33a may be formed over the perimeter of the collar part 33, or only one part may be formed, it is desirable that the bending part 33a is provided in the area | region which applies a load at the time of brazing. .

  6 is a cross-sectional view showing a main part of a plate heat exchanger according to a modification of the first embodiment, and is a cross-sectional end view corresponding to FIG. In this modified example, as shown in FIG. 6, the second plate 3b, the fourth plate 3d,..., And the final plate 3e, that is, the lower transmission of the pair forming the first flow path 301 on the high temperature side. Also with respect to the heat plate 3, a bent portion 33 b is provided in the flange portion 33, and the bent position is arranged on the inner side of the odd-numbered bent portion 33 a. Other configurations are the same as those in FIG.

In the modification of the first embodiment configured as described above, in addition to the same effects as those of the plate heat exchanger shown in FIG. 5, the tips of the flanges 33 of all the heat transfer plates 3 to be stacked. Since the bent portions 33a and 33b are formed, the strength of the flange portion 33 is further increased, and deformation of the heat transfer plate 3 due to load application at the time of brazing can be further suppressed. The effect that a plate type heat exchanger can be provided is acquired.
Note that the direction of the bent portion 33a shown in FIG. 5 may be reversed. Moreover, although the example provided in the odd-numbered collar part 33 of the laminated heat-transfer plate 3 was shown, you may make it provide in the even-numbered. Further, the number of stacked layers may be further increased.

  As described above, according to the first embodiment of the first invention of the present invention, the laminated state of the heat transfer plates 3 forming a pair can be easily confirmed, and the upper heat transfer plate is assembled during assembly. It becomes easy to prevent an error in the combination of the pair of the (first and third plates 3a and 3c) and the lower heat transfer plate (second, fourth and final plates 3b, 3d and 3e). In addition, since the shape of the flange 33 is stabilized and the rigidity is increased by the bent portion 33a, deformation of the flange 33 due to a load applied perpendicularly to the flat portion E of the flange 33 is suppressed. Is done. For this reason, the deformation | transformation of this collar part 33 by the load applied perpendicularly | vertically with respect to the flat part E at the time of brazing of the laminated | stacked heat-transfer plate 3 is suppressed, and the water-tightness and airtightness between the laminated | heated heat-transfer plates are suppressed. A plate heat exchanger with high quality can be obtained reliably.

  Moreover, manufacturing costs can be reduced by reducing defective products, and products can be provided at low cost. Furthermore, energy consumption in the manufacturing process can be reduced by reducing defective products. The improvement of the quality can be expected to improve the reliability, durability and safety of the product. In addition, the strength of the flange portion 33a by the bent portion 33a can be reduced, so that the thickness of the heat transfer plate 3 can be reduced. In this case, weight reduction and transportation efficiency can be expected.

Embodiment 2. FIG.
FIG. 7 is a cross-sectional view showing the main part of the plate heat exchanger according to the second embodiment of the present invention as set forth in claim 4, and is a view taken along the line VII-VII in FIG. It is sectional drawing in the lamination | stacking state corresponded to a figure. 8 is an expanded view showing the arrangement of the concave and convex portions for detecting misstacking provided on the flange portion of the heat transfer plate shown in FIG. 7, and FIG. 9 is an exploded view showing the concave and convex portions shown in FIG. The figure which designates the area | region on the collar part when providing a part in an odd-numbered heat-transfer plate, FIG. 10 is the area | region on collar part when providing the recessed part and convex part which are similarly shown in FIG. It is a figure which designates.

  As shown in FIGS. 7 and 8, the second embodiment interferes with a predetermined portion of the flange portion 33 of all the stacked heat transfer plates 3 and, in the case of erroneous stacking, with a partner adjacent in the stacking direction. In the normal laminated state, the protrusions 35 (black circles ●) and the recesses 36 (white circles ○) formed by pressing are provided so as not to interfere with each other. As shown in the above, when two heat transfer plates assembled in pairs are alternately reversed and stacked, the knitting mistake of the pair, the mistake of reversal (half rotation) when stacking, etc. This makes it possible to easily detect stacking errors.

  The convex portion 35 and the concave portion 36 are the first region I, the second region II, and the third region III of the flange 33 shown in FIG. 9 for the odd-numbered heat transfer plate 3 and FIG. 10 for the even-numbered heat transfer plate. , And any position in the fourth region IV, but when the heat transfer plates 3 are stacked, the respective protrusions 35 and recesses 36 are rotated by 180 ° with respect to the center 5 of the heat transfer plate 3. Even when it is made to rotate and when it is not rotated 180 °, it must be arranged so as to overlap each other in the stacking direction. Accordingly, the convex portion 35 and the concave portion 36 are arranged in a symmetrical positional relationship with respect to the horizontal axis 51 and the heat transfer plate vertical axis 52 of the heat transfer plate 3.

  That is, two sets of regions that are point-symmetric with respect to the center 5 of the heat transfer plate 3 are set around the flange portion 33, and any one of the concave portion 36, the convex portion 35, and the flat portion is set in the predetermined portion of the region. To form. For example, of the two sets of regions, one of the first region I and the third region III constituting one set is a flat portion, and the rest is one of a concave portion 36 and a convex portion 35, and the second portion constituting the other set. One of the region II and the fourth region IV is combined as a flat part and the rest as the other of the concave part 36 and the convex part 35. In the case of the second embodiment, for the odd-numbered heat transfer plate, the concave portion 36 is disposed in the first region I, and the convex portion 35 is disposed in the second region II, and for the even-numbered heat transfer plate, the second region. The object is achieved by arranging the concave portion 36 in II and the convex portion 35 in the third region III.

  As described above, the convex portions 35 or the concave portions 36 are provided at four positions set on the flange portion 33 of the heat transfer plate 3. In this example, as shown in FIG. Two places are provided for a total of four places. Of the four locations, the convex portion 35 and the concave portion 36 are each one, and the remaining two locations are flat. Moreover, the convex part 35 and the recessed part 36 are formed in the cross-sectional trapezoid shape as shown in FIG. The height 35H of the convex portion 35 and the depth 36D of the concave portion 36 are not less than 1/2 of the gap F of the flange portion 33 of the adjacent heat transfer plate 3 and not more than the gap F. It is desirable to be the same as the gap F. In addition, the shape of the convex part 35 and the recessed part 36 is not limited to the circular protrusion structure illustrated in the figure, For example, what is necessary is just a structure which can become protrusions, such as an elliptical protrusion structure and a bending structure.

  As described in the first embodiment, the plate heat exchanger 300 includes a pair of the first and second plates 3a and 3b on which the unevenness 31 forming the first flow path 301 on the high temperature side is alternately formed by 180 °. It is formed by reversing and repeatedly laminating, and basically consists of laminating two types of heat transfer plates 3 of a first plate 3a and a second plate 3b in a predetermined order and in a predetermined direction. For this reason, mistakes in combination of pairs and mistakes in inversion cause deterioration or failure of functions in any case, so it is necessary to prevent erroneous stacking.

  In the arrangement shown in the developed view of FIG. 8, for example, when focusing on the first and second heat transfer plates 3 from the right side of the drawing, that is, the first plate 3a and the second plate 3b, the orientation at the time of stacking is correct as shown in the figure. In this case, the tops of the adjacent convex portions 35 and concave portions 36 that overlap in the vertical direction can be normally stacked without interfering with each other. On the other hand, if the orientation when the second plate 3b is stacked is incorrect by 180 °, the convex portion 35 on the lower left side of the second plate 3b comes to the upper right position in the figure, so that the first plate disposed on the upper part thereof It interferes with the recess 36 at the upper right of 3a, and it becomes impossible to laminate normally. The second plate 3b, the third plate 3c, the third plate 3c, and the fourth plate 3d are also set so that if any one of them has a pair error or a reversal error, it interferes with an adjacent partner. .

  As described above, according to the second embodiment, in the plate-type heat exchanger, in the predetermined portion of the flange portion 33 formed around the heat transfer plate 3, in the case of erroneous stacking, against a partner adjacent in the stacking direction. When forming a pair with two types of heat transfer plates formed in pairs by providing the concave portions 36 and the convex portions 35 formed by a combination that interferes with each other and does not interfere with each other in a normal laminated state It is possible to easily detect the knitting mistake and the stacking mistake when the heat transfer plates forming the pair are alternately reversed and stacked. For this reason, the manufacturing cost of the product obtained is reduced, and the effect that the product can be provided at low cost is obtained. In addition, although the example which provided the bending part 33a as shown in FIG. 7 was shown, even if it does not provide, a misstacking can be detected.

Embodiments 3 to 9
In the plate heat exchanger according to Embodiments 3 to 9 of the present invention, the convex portion 35 and the concave portion 36 are provided in the first region I to the fourth region IV of the flange portion 33 of the second embodiment. These combinations are manufactured by changing the combinations as shown in Embodiments 3 to 9 in Table 1. In Table 1, “plate” indicates the heat transfer plate 3, “concave” indicates the concave portion 36, “convex” indicates the convex portion 35, and “none” indicates that neither the concave portion 36 nor the convex portion 35 is provided. ing. For example, with respect to the first plate in the third embodiment, the first region I is provided with the concave portion 36 and the fourth region IV is provided with the convex portion 35, and the second region II and the third region III are provided with the concave portion 36 and the convex portion 35. None of these are provided. Other configurations are the same as those of the first embodiment.

  In any combination of Embodiments 3 to 9 configured as described above, it is easy to make a stacking error when two types of heat transfer plates assembled in pairs are alternately reversed and stacked. The same effects as in the second embodiment can be obtained.

Embodiment 10 FIG.
A plate heat exchanger according to a tenth embodiment of the present invention described in claim 8 is the plate heat exchanger according to the tenth embodiment described in claim 1 and the fourth invention described in claim 4. This is a combination of the two inventions. That is, in the plate heat exchanger according to the tenth embodiment, the folded portion 33a as shown in FIG. 5 or FIG. As shown in FIG. 7 and FIG. 8, a portion 33 b is provided at a predetermined position of the flange portion 33, so that they interfere with each other adjacent to each other in the stacking direction as shown in FIGS. The concave portion 36 and the convex portion 35 formed by the combination described above are provided. 7 corresponds to an example in which both the bent portion 33a, the concave portion 36, and the convex portion 35 are provided.

  The installation position when the bent portion 33a, or the bent portion 33a and the bent portion 33b, and the concave portion 36 and the convex portion 35 are provided in the flange portion 33 is not particularly limited, but the bent portion 33a. Alternatively, when the bent portion 33a and the bent portion 33b are provided on the long side of the flange portion 33 and the concave portion 36 and the convex portion 35 are provided on the short side of the flange portion 33, the heat transfer plate 3 is laminated. When forming the pair of heat transfer plates 3 by visually inspecting the arrangement of the bent portion 33a and the space portion D (FIG. 5) or the bent portion 33b (FIG. 6) from the long side of the laminate, for example. It is possible to detect a mistake and easily check the situation when there is a stacking mistake from the short side of the stack. Note that visual observation may be changed to monitoring by image processing.

  According to the tenth embodiment configured as described above, the bent portion 33a is provided in the flange portion 33 of the odd-numbered or even-numbered, or odd-numbered and even-numbered heat conducting plate 3, thereby Combination mistakes can be prevented. In addition, by providing the predetermined concave portions 36 and the convex portions 35 in the flange portions 33 of all the heat transfer plates, it is possible to prevent an error in the orientation during stacking. Furthermore, by providing the bent portion 33a in the flange portion 33, the strength of the flange portion 33 is increased, and deformation of the heat transfer plate due to load application at the time of brazing joining can be suppressed. The effect that a heat exchanger can be provided is obtained.

  By the way, although the said embodiment demonstrated the case where the plate type heat exchanger of this invention was used for the additional cooking of a bathtub, it is not limited to this. For example, when the high temperature side liquid contains a foreign substance and the low temperature side liquid does not contain a foreign substance, the low temperature side liquid may flow through the first flow path, contrary to the embodiment.

  DESCRIPTION OF SYMBOLS 1 Heat pump circuit, 2 Tank unit, 21 Hot water storage tank, 3 Heat transfer plate, 3a 1st plate, 3b 2nd plate, 3c 3rd plate, 3d 4th plate, 3e Final plate, 31 Concavity and convexity, 31a Top part, 31b Bottom part, 32 sealing part, 33 collar part, 33a, 33b bent part, 34 support part, 35 convex part, 35H height, 36 concave part, 36D depth, 5 center, 51 horizontal axis, 52 vertical axis, P1 first pair , P2 second pair, 300 plate heat exchanger, 301 first flow path (high temperature side flow path), 302 second flow path (low temperature side flow path), B contact, C contact portion, D space portion, E Flat part, F Gap between flange parts 33.

Claims (3)

A predetermined number of heat transfer plates each having a wavy unevenness formed in the central portion and a sealing portion and a flange extending outward from the sealing portion formed in the peripheral portion are laminated, and adjacent heat transfer plates A plate-type heat exchanger that alternately uses the internal space as a low-temperature side flow path and a high-temperature side flow path in the stacking direction, the odd-numbered or even-numbered end of the flange in the stacking direction of the heat transfer plate The bent portion extends in the extending direction of the heat transfer plate, and the bent portion of the bent portion extends perpendicular to the extending direction of the heat transfer plate. A plate heat exchanger characterized by being present .   The bent portion is provided in the odd-numbered flange portion, and a tip portion bent in the direction of the adjacent even-numbered flange portion extends to the vicinity of the protruding end portion of the adjacent even-numbered flange portion. The plate heat exchanger according to claim 1, wherein the plate heat exchanger is formed.   The bent portion is provided in a flange portion of all the heat transfer plates, and the positions of the bent portion are alternately formed in the stacking direction on the inner side and the outer side. The plate-type heat exchanger according to claim 1 or 2.

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