JP4448377B2 - Plate heat exchanger - Google Patents

Description

  The present invention relates to a heat exchanger that circulates a heat medium made of fluid and also circulates a heat exchanger made of fluid to exchange heat with the heat exchanger. The present invention relates to a plate heat exchanger in which a first space in which heat plates are stacked and a heat medium is circulated and a second space in which a heat exchanger is circulated are alternately formed.

  2. Description of the Related Art Conventionally, various types of heat exchangers that exchange heat with respect to a heat exchanger are provided. One of them is a plate heat exchanger. Such a plate heat exchanger is adopted in various fields because of its small size and high heat exchange efficiency. As shown in FIG. 10, a plurality of heat transfer plates 100a and 100b are laminated to A pair of first flow paths P1 and P1 'are formed to allow the heat medium M made of fluid such as steam to flow in and out, and a pair of second flow paths P2 from which the heat exchanger W made of fluid such as water flows in and out. , P2 ′.

  As the heat transfer plates 100a and 100b, for example, two types shown in FIGS. 11A and 11B are adopted. Specifically, each of the heat transfer plates 100a and 100b is formed by press-molding a single plate material having a substantially rectangular shape, and has a plurality of concave portions 101a (protrusions) and convex portions 101b (protrusions) on both surfaces. ) Is formed continuously and has a corrugated shape. In the two types of heat transfer plates 100a and 100b shown in FIGS. 11 (a) and 11 (b), the shapes of the concave stripes 101a and the convex stripes 101b are mirror images, and the convex portions 101b and 101b Are configured to form first spaces X, X... For circulating the heat medium M between the recesses 101a, 101a, or second spaces Y, Y. (See FIG. 12). In addition, the shape, aspect | mode, and combination of the groove 101a and the protrusion 101b which were shown to FIG. 11 (A) and (B) are examples.

  Four openings 102a, 102b, 103a, 103c are formed in the four corners of the heat transfer plates 100a, 100b. Of the four openings 102a, 102b, 103a, 103b, a pair of openings 102a, 102b (first openings) arranged diagonally form the first flow paths P1, P1 ′ through which the heat medium M flows in and out. The pair of openings 103a and 103b (second openings) arranged at the remaining diagonals form the second flow paths P2 and P2 ′ through which the heat exchanger W flows in and out. belongs to.

  The plate type heat exchanger has the two kinds of heat transfer plates 100a and 100b alternately stacked, and as shown in FIG. 12, the outer peripheral edges of the heat transfer plates 100a and 100b are in surface contact with each other. The first spaces X, X,... Through which the heat medium M flows through the heat transfer plates 100a, 100b, and the second spaces Y, Y, through which the heat exchanger W flows, are sealed. They are alternately formed in a liquid-tight state or an air-tight state.

  Moreover, it is an opening peripheral part of 1st opening 102a, 102b of adjacent heat-transfer plate 100a, 100b, Comprising: One surface of one heat-transfer plate 100a and the other surface of the other heat-transfer plate 100b are piled up direction The peripheral edge portions of the first openings 102a and 102b are sealed together by being brought into surface contact with each other, thereby sealing the first openings 102a and 102b of the heat transfer plates 100a and 100b. A pair of the first flow paths P1 and P1 ′ are formed which communicate with each other via the first spaces X, X. Moreover, it is an opening peripheral part of 2nd opening 103a, 103b of adjacent heat-transfer plate 100a, 100b, Comprising: The other surface of one heat-transfer plate 100a and one surface of the other heat-transfer plate 100b are piled up. The peripheral edges of the second openings 103a and 103b are sealed by brazing in a state of surface contact in the direction, whereby the second openings 103a and 103b of the heat transfer plates 100a and 100b are sealed. And a pair of second flow paths P2 and P2 ′ communicating with each other through the second spaces Y, Y... Are formed.

The plate heat exchanger having the above-described configuration causes the heat medium M to flow from one of the first flow paths P1 connected to the primary side pipe that supplies the heat medium M, and the heat medium M passes through the first space X. At the same time as flowing out from the other first flow path P1 ′, the heat exchange body W is introduced from one second flow path P2 connected to the primary side pipe supplying the heat exchange body W, and the second space Y And the heat transfer plate 100a, 100b prevents the heat medium M and the heat exchanger W from mixing with each other, and the heat transfer plate 100a, Heat exchange with respect to the heat exchanger W can be performed by heat conduction from 100b. (For example, refer to Patent Document 1).
JP-A-5-274194

  By the way, the plate-type heat exchanger having the above-described configuration is sealed in a state in which the opening peripheral portions of the first openings 102a and 102b of the heat transfer plates 100a and 100b are in surface contact with each other, or the heat transfer plates 100a and 100b. The first flow paths P1, P1 ′ through which the heat medium M is circulated, the first spaces X, X..., The second spaces Y, Y. Since it is configured to be defined in a liquid-tight state or an air-tight state, a region (area) affected by the heat of the heat medium M becomes large. Therefore, the thermal stress concentratedly acts on these parts, and local cracks may occur. In particular, if the flow and stop of the heat medium M are frequently switched, the effect of thermal stress due to temperature change increases, and cracking becomes prominent.

  Therefore, in view of such circumstances, the present invention can suppress the occurrence of local thermal stress even when the heat of the heat medium acts, and can prevent the occurrence of local cracking. It is an object of the present invention to provide a plate heat exchanger.

  The plate heat exchanger according to the present invention has a heat transfer plate in which a pair of first openings and a pair of second openings are formed with a predetermined interval, and concave and convex portions are formed on both surfaces. A plurality of sheets are laminated by interfering with each other, and a space between the outer peripheral edges of the heat transfer plate is sealed, whereby a first space through which a heat medium made of fluid flows and a heat exchanger made of fluid flow. The second spaces are alternately formed with each heat transfer plate as a boundary, and the gap between the opening edges of the first openings of the adjacent heat transfer plates is sealed, so that the first spaces are connected to each other. A pair of first flow paths communicating with each other are formed, and the gap between the opening edges of the second openings of the adjacent heat transfer plates is sealed, so that the second openings are connected to each other via the second space. In a plate heat exchanger in which a pair of second flow paths communicating with each other is formed, adjacent to each other The gap between the opening edges of the first opening in the heat plate is sealed through a sealing means, and a gap continuous with the second space is formed between the opening peripheral edges of the first opening in the heat transfer plate. Features.

  According to the plate heat exchanger, the opening edge of the first opening in the adjacent heat transfer plate is sealed via the sealing means, and the first opening in the heat transfer plate is Since a gap that is continuous with the two spaces is formed, the heat exchanger that has flowed into the second space via one of the second flow paths reaches the gap between the peripheral edges of the first opening in the heat transfer plate. Will come. That is, a gap (space) that is surrounded by a sealing means that seals between the opening peripheral edge of the first opening of the opposing heat transfer plate and the opening edge and communicates with the second space is formed like a pocket. Thus, the heat exchanger in the second space enters the gap. On the other hand, the heat medium in the first flow path exists on the back surface side of the heat transfer plate and the sealing means that define the space. The heat of the heat medium is generated by the sealing means and the heat transfer plate. To the heat exchanger that exists between the peripheral edges of the first opening through the heat exchanger (heat is taken away by the heat exchanger), so that the heat transfer plate and the sealing means have a heat medium. It is possible to prevent the heat from acting intensively. Thereby, it can suppress that a thermal stress generate | occur | produces in the said part, and can prevent that a local crack generate | occur | produces in a heat exchanger plate.

  As one aspect of the present invention, the sealing means is composed of an annular piece extending from the opening edge of the first opening of at least one of the adjacent heat transfer plates toward the other heat transfer plate, The annular piece may be sealed to the other adjacent heat transfer plate. In this way, the sealing means is not configured separately from the heat transfer plate, and the annular piece is sealed to the other heat transfer plate, thereby forming a gap into which the heat exchange body flows. In addition, the gap between the opening edges of the first opening of the heat transfer plate can be sealed.

  In this case, the annular piece extends from the opening edge of the first opening of each heat transfer plate, the annular pieces of each heat transfer plate are fitted substantially concentrically, and the annular pieces are sealed together. In this case, the heat transfer plates can be easily positioned and assembled, and a gap through which the heat exchange body flows from the second space can be surely formed between the opening peripheral portions of the first openings of the heat transfer plates.

  Further, a heat transfer plate in which one end opening of the pair of first flow paths is formed, a first end plate disposed to face the heat transfer plate with a space therebetween, and a space from the first end plate. And the second end plates that are arranged opposite to each other are overlapped with each other and their outer peripheral edge portions are sealed with each other, and the first end plate corresponds to the arrangement of the second opening of the heat transfer plate. An opening may be formed, and a pair of second flow paths may communicate with each other through a space between the first end plate and the second end plate.

  By doing so, the heat medium flows from the first flow path into the space formed between the heat transfer plate and the first end plate, and the heat of the heat medium always acts on the first end plate. However, since an opening is formed in the first end plate corresponding to the arrangement of the second opening, and the second end plate is arranged at a distance from the first end plate, The heat exchange member flows between the first end plate and the second end plate through the opening of the first end plate. Thereby, the heat of the heat medium is transferred to the heat exchanger existing in the space between the first end plate and the second end plate via the first end plate (the heat is applied to the heat medium). Therefore, it is possible to prevent the heat of the heat medium from acting on the first end plate intensively. Thereby, it can suppress that the concentrated thermal stress generate | occur | produces with respect to a 1st end plate, and can prevent that a local crack generate | occur | produces in a 1st end plate.

  The outer peripheral edge of each heat transfer plate is sealed with the opposing surfaces forming the first space in a stacked state in close contact with each other, and the gap communicating with the second space between the opposing surfaces forming the second space The shape may be set so as to form a gap between the outer peripheral edges of adjacent heat transfer plates. If it does in this way, the to-be-heated body which distribute | circulates the inside of 2nd space will reach | attain to the outer periphery edge part of a heat exchanger plate. Then, the heat of the heat transfer medium is transferred to the heat exchanger via the heat transfer plate (heat is lost to the heat exchanger), so that the heat of the heat transfer medium acts on the outer edge of the heat transfer plate. Can be prevented. Thereby, it can suppress that a thermal stress generate | occur | produces in the outer peripheral edge part of a heat exchanger plate, and it can prevent that a local crack generate | occur | produces in the outer peripheral edge part (in the outer periphery of a plate type heat exchanger) of a heat exchanger plate. Can be prevented.

  In addition, the plate heat exchanger according to the present invention includes a heat transfer plate having a pair of first openings and a pair of second openings with a predetermined interval, and a recess and a protrusion formed on both sides. A plurality of layers are laminated with each convex portion interfering with each other, and a space between the outer peripheral edges of the heat transfer plate is sealed, whereby a first space through which a heat medium made of fluid flows and a heat exchanger made of fluid The second space to be circulated is alternately formed with each heat transfer plate as a boundary, and the gap between the opening edges of the first openings of the adjacent heat transfer plates is sealed, so that the first openings are connected to each other. A pair of first flow paths communicating with each other through one space is formed, and between the opening edges of the second openings of the adjacent heat transfer plates is sealed, so that each second opening is connected to the second space. In a plate heat exchanger in which a pair of second flow paths communicating with each other are formed, A heat transfer plate having an opening at one end of the first flow path, a first end plate disposed opposite to the heat transfer plate with a gap, and a gap with respect to the first end plate. The second end plates arranged opposite to each other are overlapped, and the outer peripheral edges of each other are sealed, and the first end plate has a pair of openings corresponding to the arrangement of the second openings of the heat transfer plate. A pair of second flow paths communicate with each other through a space between the first end plate and the second end plate.

  According to the plate type heat exchanger, the heat medium flows from the first flow path into the space formed between the heat transfer plate and the first end plate, and the heat medium is always in the first end plate. Although heat acts, an opening is formed in the first end plate corresponding to the arrangement of the second opening, and the second end plate is arranged at a distance from the first end plate. Therefore, the heat exchange body flows between the first end plate and the second end plate through the opening of the first end plate. As a result, heat from the heat transfer medium is transferred through the first end plate to the heat exchanger that exists in the space between the first end plate and the second end plate (heat is transferred to the heat transfer medium). Therefore, it is possible to prevent the heat of the heat medium from acting on the first end plate intensively. Thereby, it can suppress that the concentrated thermal stress generate | occur | produces with respect to a 1st end plate, and can prevent that a local crack generate | occur | produces in a 1st end plate.

  Furthermore, the plate-type heat exchanger according to the present invention includes a heat transfer plate in which a pair of first openings and a pair of second openings are formed with a predetermined interval, and concave and convex portions are formed on both sides. A plurality of layers are laminated with each convex portion interfering, and the outer peripheral edge portions of the heat transfer plate are sealed, whereby a first space through which a heat medium made of fluid flows, and a heat exchanger made of fluid The second spaces to be circulated are alternately formed with each heat transfer plate as a boundary, and the opening edges of the first openings of the adjacent heat transfer plates are sealed, so that the first openings are connected to each other. A pair of first flow paths communicating with each other through one space are formed, and the opening edges of the second openings of the adjacent heat transfer plates are sealed together, so that each second opening is connected to the second space. A plate heat exchanger in which a pair of second flow paths communicating with each other is formed. The outer peripheral edge of each heat transfer plate is sealed with the opposing surfaces forming the first space in a stacked state in close contact with each other, and is continuous with the second space between the opposing surfaces forming the second space. The shape is set so as to form a gap, and the space between the outer peripheral edges of adjacent heat transfer plates is sealed.

  According to the plate heat exchanger, the heat exchanger that circulates in the second space reaches the outer peripheral edge of the heat transfer plate. Then, the heat of the heat transfer medium is transferred to the heat exchanger via the heat transfer plate (heat is lost to the heat exchanger), so that the heat of the heat transfer medium acts on the outer edge of the heat transfer plate. Can be prevented. Thereby, it can suppress that a thermal stress generate | occur | produces in the outer peripheral edge part of a heat exchanger plate, and it can prevent that a local crack generate | occur | produces in the outer peripheral edge part (in the outer periphery of a plate type heat exchanger) of a heat exchanger plate. Can be prevented.

  As described above, according to the plate heat exchanger according to the present invention, it is possible to suppress the occurrence of local thermal stress even when the heat of the heat medium acts, and local cracking occurs. It is possible to achieve an excellent effect that can be prevented.

  Hereinafter, a plate heat exchanger according to an embodiment of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is an overall perspective view of a plate heat exchanger according to the present embodiment, and FIG. 2 is a cross-sectional view of the plate heat exchanger according to the present embodiment, taken along the line AA of FIG. Is shown. 3 is an enlarged view of the main part of FIG. 2 and shows one (upstream side) first flow path and its periphery, which will be described later, and FIG. 4 is an enlarged view of the main part of FIG. The second flow path on the one side (upstream side) and its periphery are shown.

  In the plate heat exchanger according to the present embodiment, as shown in FIGS. 1 and 2, a plurality of heat transfer plates 2a, 2b, 2a, 2b... Are stacked between two frame plates 1a, 1b. As a result, a pair of first flow paths P1, P1 ′ through which the heat medium M made of a fluid such as steam and hot water flows in and out is formed, and a pair of first flow paths W for making the heat exchanger W made of a fluid such as water flow in and out. Two flow paths P2 and P2 ′ are formed.

  Each of the frame plates 1a and 1b has a body portion 10 formed in a substantially rectangular plate shape in plan view, and a direction in which the heat transfer plates 2a, 2b, 2a, 2b,. And a bent piece portion 11 extending in the direction of alignment). In the main body portion 10 of one frame plate 1a, the formation positions of the first flow paths P1 and P1 ′ through which the heat medium M flows and the second flow paths P2 and P2 ′ through which the heat exchanger W flows are transmitted. Through holes 12 and 13 are formed corresponding to positions where first openings 26a, 26b, 28a and 28b, which will be described later, and second openings 27a, 27b, 29a and 29b are formed in the heat plates 2a, 2b, 2a, 2b. ing. Cylindrical connecting portions 14 and 15 are air-tightly or liquid-tightly protruded from the opening edges of the through holes 12 and 13.

  In the present embodiment, two types of heat transfer plates 2a, 2b, 2a, 2b... Are employed, both of which are formed by pressing a plate material. As shown in FIGS. 5 (a) and 5 (b), each heat transfer plate 2a, 2b includes heat transfer portions 22a, 22b each having a substantially rectangular region in plan view, and outer peripheral edges of the heat transfer portions 22a, 22b. To the heat transfer plates 2a and 2b (the heat transfer portions 22a and 22b), and bent piece portions 23a and 23b extending in the substantially overlapping direction. 5A shows a plan view of one heat transfer plate 2a, and FIG. 5B shows a plan view of the other heat transfer plate 2b.

  In the heat transfer portions 22a and 22b of the heat transfer plates 2a and 2b, first openings 26a, 26b, 28a and 28b for forming a pair of first flow paths P1 and P1 ′ through which the heat medium M flows in and out are long. A pair of (two) holes are formed at both ends in the direction, and second openings 27a, 27b, 29a, 29b for forming a pair of second flow paths P2, P2 ′ through which the heat exchange body W flows in and out. However, a pair (two) is formed at both ends in the longitudinal direction along the first openings 26a, 26b, 28a, 28b.

  Specifically, of the pair of first openings 26a, 26b, 28a, 28b, one first opening 26a, 28a forms an upstream (one) first flow path P1 through which the heat medium M flows. For this purpose, it is provided at one end in the longitudinal direction of the heat transfer portions 22a and 22b and at one end in the short direction of the heat transfer portions 22a and 22b. The other first openings 26b and 28b are for forming a downstream (the other) first flow path P1 ′ through which the heat medium M flows out, and at the other end in the longitudinal direction of the heat transfer portions 22a and 22b. Thus, the heat transfer portions 22a and 22b are formed on the other end side in the short direction.

  Of the pair of second openings 27a, 27b, 29a, 29b, one second opening 27a, 29a is for forming a downstream (the other) second flow path P2 ′ through which the heat exchanger W flows out. This is one end portion in the longitudinal direction of the heat transfer portions 22a and 22b, and is formed in the other end side in the short direction of the heat transfer portions 22a and 22b. The other second openings 27b and 29b are for forming an upstream (one) second flow path P2 into which the heat exchanger W is introduced, and the other ends in the longitudinal direction of the heat transfer portions 22a and 22b. It is a part, Comprising: It drills in the one end side of the transversal direction of the heat-transfer parts 22a and 22b. That is, the pair of first openings 26a, 26b, 28a, 28b and the pair of second openings 27a, 27b, 29a, 29b are diagonally spaced at the four corners of the heat transfer portions 22a, 22b, respectively. Is located and drilled.

  The plate heat exchanger is used in a mode in which the heat transfer plates 2a, 2b are erected so that one end in the longitudinal direction is on the upper side, and gas is contained in the upper part of the second spaces Y, Y. In order to prevent stagnation, one of the second openings 27a and 29a is provided so as to be located on one end side in the longitudinal direction of the heat transfer portions 22a and 22b with respect to the one of the first openings 26a and 28a. Specifically, the horizontal tangent to the upper part of one second opening 27a, 29a is above the horizontal tangent to the upper part of one first opening 26a, 28a (the longitudinal direction of heat transfer parts 22a, 22b). The hole diameter and arrangement of the first openings 26a, 28a and the second openings 27a, 29a are set so as to be located on one end side of the second openings 27a, 29a. In the present embodiment, the opening diameters of the second openings 27a and 29a are set to be smaller than the opening diameters of the first openings 26a and 28a, and the hole centers of the second openings 27a and 29a are the first openings 26a. , 28a is positioned closer to one end of the heat transfer portions 22a, 22b than the center of the opening (displaced upward), so that the upper portions of the second openings 27a, 29a are more heat transfer portions 22a, 22b than the first openings 27a. It is formed so that it may be located in the one end side of the longitudinal direction.

  Of these two types of heat transfer plates 2a, 2b, one heat transfer plate 2a is the second heat transfer plate 2b adjacent to the opening edge of each of the first openings 26a, 26b in a stacked state. Ring pieces 260a and 260b (hereinafter referred to as “first ring pieces”) are provided as sealing means for sealing between the opening edges of the openings 26a and 26b. The first annular pieces 260a and 260b of the heat transfer plate 2a extend in the stacking direction of the heat transfer plates 2a and 2b from the other surface of the heat transfer portion 22a on the other frame plate 1b side. Further, the one heat transfer plate 2a seals between the opening edges of the second openings 27a and 27b of the other heat transfer plate 2b, which are also laminated at the opening ends of the second openings 27a and 27b. Ring pieces 270a and 270b (hereinafter referred to as second ring pieces) as sealing means are extended. The second annular pieces 270a and 270b extend in the opposite direction to the first annular pieces 260a and 260b from one surface of the heat transfer section 22a on the one frame plate 1a side.

  The other heat transfer plate 2b is a seal that seals between the opening edges of the first openings 28a and 28b and the opening edges of the first openings 26a and 26b of the adjacent one of the heat transfer plates 2a in the stacked state. Annular pieces 280a and 280b (hereinafter referred to as the first annular piece) are extended as stop means. The first annular pieces 280a and 280b of the heat transfer plate 2b extend in the stacking direction of the heat transfer plates 2a and 2b from one surface of the heat transfer portion 22b on the one frame plate 1a side. The first annular pieces 260a and 260b of the heat plate 2a can be fitted substantially concentrically.

  Further, the other heat transfer plate 2b seals between the opening edges of the second openings 27a and 27b of the one heat transfer plate 2a in the laminated state at the opening ends of the second openings 29a and 29b. As the sealing means, annular pieces 290a and 290b (hereinafter, this annular piece is referred to as a second annular piece) are extended. The second annular pieces 290a and 290b are formed to extend in the opposite direction from the first annular pieces 280a and 280b from the other surface of the heat transfer portion 22b on the other frame plate 1b side. The second annular pieces 270a and 270b of the plate 2a can be fitted substantially concentrically. In the present embodiment, the two types of heat transfer plates 2a and 2b reliably fit the first annular pieces 260a, 260b, 280a, and 280b and the second annular pieces 270a, 270b, 290a, and 290b. As possible, the peripheral portions of the first annular pieces 260a, 260b, 280a, 280b and the second annular pieces 270a, 270b, 290a, 290b in the heat transfer portions 22a, 22b are formed flat.

  Thereby, each heat transfer plate 2a, 2b fits the first annular pieces 260a, 260b, 280a, 280b of the adjacent heat transfer plates 2a, 2b and the second annular pieces 270a, 270b, 290a, 290b. As a result, the first openings 26a, 26b,..., 28a, 28b... Of the plurality of stacked heat transfer plates 2a, 2b, 2a, 2b. At the same time, the second openings 27a, 27b, ..., 29a, 29b, ... are connected to form a pair of second flow paths P2, P2 '.

  Further, as shown in FIGS. 2 and 3, each heat transfer plate 2a, 2b has a first annular piece between the opening peripheries of the first openings 26a, 26b..., 28a, 28b. By interposing 260a, 260b, 280a, 280b, between the opening peripheral portions of the first openings 26a, 26b ..., 28a, 28b ... in the adjacent heat transfer plates 2a, 2b, second spaces Y, Y ... described later. A gap S1 into which the heat exchanger W in the second space Y, Y flows is formed continuously (communicatively).

  Furthermore, in this embodiment, as shown in FIG.2 and FIG.4, each heat-transfer plate 2a, 2b is between the opening periphery of 2nd opening 27a, 27b ..., 29a, 29b ... in adjacent heat-transfer plate 2a, 2b. The second annular pieces 270a, 270b, 290a, 290b are interposed between the opening peripheral portions of the second openings 27a, 27b, 29a, 29b, etc. in the adjacent heat transfer plates 2a, 2b. A gap S2 into which the heat medium M in the first spaces X, X flows is formed continuously (communicated) with the spaces X, X.

  Returning to FIGS. 5 (a) and 5 (b), the heat transfer portions 22a and 22b of the heat transfer plates 2a and 2b have a concave portion 20a (concave line) and a convex portion 20b (convex line) that form a plurality of lines on both sides. Is formed, and has a corrugated shape. Specifically, one of the heat transfer plates 2a is recessed 24a such that the other end side in the short direction of the heat transfer portion 22a is inclined downward toward the other end side in the longitudinal direction of the heat transfer portion 22a. The other heat transfer plate 2b is formed in such a manner that the one end side in the short direction of the heat transfer portion 22b is the other end in the longitudinal direction of the heat transfer portion 22b. The concave portion (concave portion) 20a and the convex portion (convex portion) 20b of the filament are formed so as to extend substantially in the lateral direction so as to incline forward and downward. In other words, these two types of heat transfer plates 2a and 2b have the same arrangement of the first openings 26a, 26b, 28a and 28b and the second openings 27a, 27b, 29a and 29b, and only the concave stripes 20a and the convex stripes 20b. Are formed to have a mirror image relationship.

  As a result, as shown in FIGS. 2 to 4, when these two types of heat transfer plates 2a and 2b are alternately stacked (stacked), the tops of the ridges 20b, 21. The first space X in which the ridges 20b, 21 ... of the adjacent heat transfer plates 2a, 2b intersect each other and the heat medium M is circulated by the ridges 20a, 20 ... of the heat transfer plates 2a, 2b. The second space Y through which the heat exchanger W is circulated is alternately formed with the heat transfer plates 2a and 2b (heat transfer portions 22a and 22b) as boundaries.

  Moreover, each heat-transfer plate 2a, 2b ... is continuous to the 2nd space Y between the outer periphery parts of heat-transfer part 22a, 22b (between the opposing surfaces of the outer-periphery part of heat-transfer plate 2a, 2b) in the lamination | stacking state ( It is configured to be able to form a communicating gap S3. That is, the heat transfer portions 22a, 22b of the heat transfer plates 2a, 2b are the outer peripheral edge portions of the heat transfer portions 22a, 22b of the adjacent heat transfer plates 2a, 2b in a state where the heat transfer plates 2a, 2b. A gap S3 communicating with the second spaces Y, Y... Is formed between the first annular pieces 260a, 260b, 280a, and 280b, and the second annular pieces 270a, 270b, and 290a. , 290b, the outer peripheral edge is shaped so that the surfaces on the side where it extends are in close contact with each other. In the present embodiment, since the bent piece portions 23a and 23b are extended to the outer peripheral edges of the heat transfer portions 22a and 22b, the gap S3 is in a state where the heat transfer plates 2a and 2b are overlapped. It is comprised by the space enclosed by the outer-periphery edge part of the heat-transfer parts 22a and 22b, and the bending piece part 23a.

  The plate-type heat exchanger according to the present embodiment has an interval with respect to the heat transfer plate 2b that is stacked and forms one end opening of the first flow path in addition to the two types of heat transfer plates 2a and 2b. A first end plate 2c disposed opposite to the first end plate 2c and a second end plate 2d disposed opposite to the first end plate 2c with an interval are further stacked.

  As shown in FIGS. 6 (a) and 6 (b), both the first end plate 2c and the second end plate 2d are obtained by pressing a plate material in the same manner as the heat transfer plates 2a and 2b. Corresponding to the heat transfer portions 22a and 22b of 2a and 2b, closed portions 22c and 22d made of a substantially rectangular plate in plan view, and bent piece portions 23c and 23d extending from the outer peripheral edge of the closed portions 22c and 22d It consists of and. FIG. 6 (a) shows a plan view of the first end plate 2c, and FIG. 6 (b) shows a plan view of the second end plate 2d.

  In the closing portion 22c of the first end plate 2c, a region 26c corresponding to the first openings 28a, 28b of the adjacent heat transfer plate 2b is formed flat, and the grooves 24a and the protrusions are formed on both surfaces except for the flat region 26c. The strips 24b are continuously formed to have a corrugated shape. In the state where the first end plate 2c is stacked on the heat transfer plate 2b, the protrusions 24b interfere with the protrusions 20b of the heat transfer plate 2b so that spaces are formed by the respective recesses 20a and 24a. It has become. The flat region 26c formed in the first end plate 2c is formed so as to form a gap with the adjacent heat transfer plate 2b, and flows out from one end opening of one first flow path P1. The heat medium M to be guided can be guided toward the other first flow path P1 ′ through the space (see FIGS. 2 and 3).

  The closing portion 22c of the first end plate 2c is provided with an opening 29c (for convenience, the opening is also referred to as the second opening) at a position corresponding to the second openings 29a and 29b of the adjacent heat transfer plate 2b. An annular piece 30 fitted to the second annular pieces 270a and 270b of the adjacent heat transfer plate 2b extends from the opening edge of the second opening 29c.

  The closing portion 22d of the second end plate 2d is formed by flatly forming areas corresponding to the flat areas 26c and 26c of the adjacent first end plate 2c and areas 31 and 31 corresponding to the openings 29c and 29c. Concave ridges 25a and ridges 25b are continuously formed on both surfaces except for the regions 31 and 31, and are formed in a corrugated plate shape. As a result, in a state where the second end plate 2d is superimposed on the first end plate 2c, the ridges 25b of the second end plate 2d interfere with the ridges 24b of the first end plate 2c, so The space Z through which the heat exchanger W flowing in through the second opening 29c of the first end plate 2c circulates is formed by 24a and 25a. That is, since the closed portions 22c and 22d of the first end plate 2c and the second end plate 2d are formed in a corrugated shape except for the flat regions 26c and 31, as described above, a plurality of heat transfer plates are used. As in the case where the layers 2a, 2b, 2a, 2b,... Are stacked, a space Z (second space) through which the heat exchanger W flows is formed between the first end plate 2c and the second end plate 2d. (See FIG. 2).

  The heat transfer plates 2a, 2b, the first end plate 2c, and the second end plate 2d are configured as described above, and the plate heat exchanger according to the present embodiment includes one frame plate 1a, The plurality of heat transfer plates 2a, 2b,..., The first end plate 2c, the second end plate 2d, and the other frame plate 1b are overlapped in this order, and the respective outer peripheral edges are sealed to each other. Spaces X, X... And second spaces Y, Y. That is, the two types of heat transfer plates 2a and 2b are alternately stacked, and the first end plate 2c and the second end plate 2d are stacked on the two heat transfer plates 2a and 2b. , 1b, the outer peripheral ends of the bent pieces 11 of the frame plates 1a, 1b, the heat transfer plates 2a, 2b, the first end plate 2c, and the second end plate 2d (the bent pieces 11, 23a, 23b). , 23c) by sealing them together by brazing, as shown in FIGS. 2 to 4, the plurality of first spaces X, X... And second spaces Y, Y with the heat transfer plates 2a, 2b as boundaries. Are alternately formed in a liquid-tight state or an air-tight state.

  Further, the first annular pieces 260a, 260b, 280a, 280b of the adjacent one heat transfer plate 2a or the other heat transfer plate 2b, the second annular pieces 270a, 270b, 290a, 290b, and the second annular piece 290b. And the annular piece are brazed and sealed in a fitted state. As a result, the first openings 26a, 26b, 28a, 28b of the heat transfer plates 2a, 2b are connected to form a pair of first flow paths P1, P1 ′ that communicate with each other through the first space X, and The second openings 27a, 27b, 29a, 29b of the heat plates 2a, 2b are connected to form a pair of second flow paths P2, P2 ′ that are connected to the second space Y and the space Z.

  Thus, the first annular pieces 260a, 260b, 280a, 280b, the second annular pieces 270a, 270b, 290a, 290b, and the second annular pieces 290b and the annular piece 30 are adjacent to each other. With the gaps S1 and S2 formed between the opening peripheries of the first openings 26a, 26b, 28a, 28b and the second openings 27a, 27b, 29a, 29b of the heat transfer plates 2a, 2b, the first openings 26a , 26b, 28a, 28b are sealed between the opening edges of the first annular pieces 260a, 260b, 280a, 280b, and between the opening edges of the second openings 27a, 27b, 29a, 29b are the second annular pieces 270a, It is in a state of being sealed with 270b, 290a, 290b (including the annular piece 30).

  In order to perform heat exchange with respect to the heat exchanger W by the plate heat exchanger having the above-described configuration, the heat medium M is caused to flow into one first flow path P1 and the heat exchanger W to one second flow path P2. Inflow.

  Then, the heat medium M that has flowed into the first flow path P1 flows into each of the plurality of formed first spaces X, X... And is discharged from the other first flow path P1 '. On the other hand, the heat exchanger W flowing into the second flow path P2 flows into each of the plurality of second spaces Y, Y,..., Z, and the heat exchanger in the second spaces Y, Y. During the circulation of W, the heat of the heat medium M flowing in the first spaces X, X... Moves into the second spaces Y, Y. If it does so, the to-be-heat-exchanged body W which distribute | circulates 2nd space Y, Y ... will be heat-exchanged, and will flow out out of the other 2nd flow path P2 '.

  At this time, since the heat medium M always circulates in the first flow path P1 and the first spaces X, X... Of the plate heat exchanger, the heat transfer portions 22a, 22b of the heat transfer plates 2a, 2b. The heat of the heat medium M acts on the peripheral edges of the first openings 26a, 26b, 28a, 28b, but the plate heat exchanger according to the present embodiment uses the adjacent heat transfer plates 2a, 2b. In the state where the gap S1 into which the heat exchanger W in the second space Y, Y... Flows is formed between the opening peripheral portions of the first openings 26a, 26b, 28a, 28b in the heat transfer portions 22a, 22b. Since the openings between the openings 26a, 26b, 28a, 28b are sealed, the sealing means (first annular pieces 260a, 260b, 280a, 280b) and the openings of the first openings 26a, 26b, 28a, 28b The heat of the heat medium acting on the edge is It will transfer to the to-be-heated exchange body W in the space | interval S1 between the opening peripheral parts of the 1st opening 26a, 26b, 28a, 28b, and heat-transfer plate 2a, 2b and sealing means (1st annular piece 260a, 260b). , 280a, 280b), it is possible to suppress the local generation of thermal stress, and it is possible to prevent the local cracking of the heat transfer plates 2a, 2b.

  Further, as described above, in the plate heat exchanger according to the present embodiment, the gap S2 through which the heat medium M in the first spaces W, W... Flows between the opening peripheral portions of the second openings 27a, 27b, 29a, 29b. Is formed between the opening edges of the second openings 27a, 27b, 29a, 29b with sealing means (second annular pieces 270a, 270b, 290a, 290b). And since the heat exchanger W is circulating on the back surface side (in the second flow path P2, P2 ′) of the opening peripheral edge of the second openings 27a, 27b, 29a, 29b, the second annular pieces 270a, 270b, 290a, 290 and the heat acting on the periphery thereof will be transferred to the heat exchanger W, and it is possible to suppress the occurrence of thermal stress in this portion, and to ensure that local cracking occurs. Can be prevented.

  Furthermore, the plate-type heat exchanger according to the present embodiment is a heat exchanger in the second space Y, Y... Between the opposing surfaces of the outer peripheral edges of the heat transfer plates 2a, 2b (heat transfer portions 22a, 22b). Since the gap between the outer peripheral edges of the heat transfer portions 22a and 22b is sealed by the bent piece portions 23a and 23b in a state where the gap S3 into which W flows is formed, the bent piece portions 11, 23a and 23b and the heat transfer portions are transferred. Heat that has acted on the outer peripheral edge portions of the heat portions 22a and 22b (heat transfer plates 2a and 2b) can be transferred to the heat exchanger W, and thermal stress can be prevented from being generated in these portions. . Thereby, it can prevent reliably that a local crack generate | occur | produces in the outer periphery of a plate type heat exchanger.

  Further, the first end plate 2c is disposed opposite to the heat transfer plate 2b forming one end opening of the first flow paths P1 and P1 ′, and the second end plate 2d is spaced from the first end plate 2c. Are arranged so as to face each other, and a space Z through which the medium to be heated M flows is formed between the first end plate 2c and the second end plate 2d, so that the heat medium flowing through the first flow paths P1 and P1 ′ Even if the heat of M acts on the first end plate 2c, the heat is transferred to the heated medium M via the first end plate 2c, and thermal stress is generated in the first end plate 2c. And local cracks in the first end plate 2c can be prevented.

  Further, in the plate heat exchanger, the one second flow path P2 ′ through which the heat exchange target body W that has undergone heat exchange flows out is more heat conductive than the first first flow path P1 through which the heat medium M flows. 22a and 22b are formed so as to be located on one end side, that is, on the upper side, even if the heat exchanger W flowing in from the second flow path P2 contains a gas, It becomes easy to guide to the second flow path P2 ′, and it is possible to prevent the presence of anything other than the heat exchanger W in the upper part of the second space Y, and to uniformize the temperature in the second space Y. Efficient heat exchange can be achieved.

  The plate heat exchanger of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.

  In the above embodiment, the second annular pieces 270a, 270b, 290a, and 290b are extended to the opening edges of the second openings 27a, 27b, 29a, and 29b, and are adjacent to the second annular portions 270a, 270b, 290a, and 290b. The second annular portions 270a, 270b, 290a, and 290b of the heat transfer plates 2a and 2b are sealed in a fitted state, but the present invention is not limited to this. A sealing means is provided between the opening ends of the one opening 26a, 26b, 28a, 28b to form the gap S1 between the opening peripheral edges, while the opening edges of the second openings 27a, 27b, 29a, 29b face each other. You may make it seal in a contact state. That is, since the second openings 27a, 27b, 29a, 29b are for forming the second flow paths P2, P2 ′ through which the heat exchanger W is circulated, the second openings 27a, 27b, 29a, 29b are formed. Since the heat of the heat medium M can be transferred to the heat exchanger M (always a cooling action can be generated) without forming a gap between the opening edge portions of the opening, cracks are caused by thermal stress. This is because it does not easily occur.

  In the said embodiment, 1st cyclic | annular piece 260a, 260b, 280a, 280b is provided so that it may extend from the opening edge of 1st opening 26a, 26b, 28a, 28b of heat-transfer part 22a, 22b, and adjacent heat transfer The first annular pieces 260a, 260b, 280a, 280b of the plates 2a, 2b are fitted together and sealed by brazing, but are not limited to this. For example, FIG. As shown, the opening ends of the first openings 26a, 26b, 28a, 28b are kept flat, and a ring body 40 as a sealing means is interposed between the heat transfer plates 2a, 2b. You may make it seal by brazing the both ends and each heat-transfer plate 2a, 2b. Even in this case, due to the presence of the ring body 40, the gap S1 into which the heat exchanger W in the second space Y, Y... Flows between the opening peripheral portions of the first openings 26a, 26b, 28a, 28b is formed. Therefore, the heat from the heat medium M acting on the ring body 40 and its periphery can be transferred to the heat exchange body W, and it is possible to suppress the generation of local thermal stress and cause cracks. Can be prevented.

  Moreover, as shown in FIG. 9, while forming the opening edge part of 1st opening 26a, 26b of one adjacent heat-transfer plate 2a flat, the cylindrical cyclic | annular part 51 in which the collar 50 was formed in the front-end | tip. May be protruded from the opening ends of the first openings 26a and 26b of the other heat transfer plate 2b, and the flange 50 and the flat region of the adjacent heat transfer plate 2a may be brazed and sealed. . Even in this case, due to the presence of the annular portion 51, heat exchange in the second spaces Y, Y... Between the opening peripheral portions of the first openings 26a, 26b, 28a, 28b of the adjacent heat transfer plates 2a, 2b. Since the gap S1 into which the body W flows can be formed, the heat from the heat medium M acting on the annular portion 51 and its periphery can be transferred to the heat exchange body W, and local thermal stress is generated. It is possible to prevent cracks from occurring.

  In the above embodiment, the bent piece portion 23a is in a state where appropriate portions of one heat transfer plate 2a and the other heat transfer plate 2b overlap each other, for example, in a state where the bent piece portions 23a, 23b. , 23b (the outer peripheral edges of the heat transfer plates 2a, 2b) are sealed by brazing, or the first annular pieces 260a are fitted and overlapped to be sealed by brazing. However, it is not always necessary to seal the heat transfer plates 2a and 2b with appropriate portions overlapping each other. That is, the end surfaces may be brought into contact with each other at appropriate locations on the heat transfer plates 2a and 2b and sealed by brazing or the like. However, considering the pressure increase in the first spaces X, X... And the second spaces Y, Y..., As in the above-described embodiment, appropriate portions (first annular pieces 260a, 280a, 260b, 280b, second annular pieces 270a, 290a, 270b, 290b, etc.) are preferably sealed in an overlapped state.

  Furthermore, in the said embodiment, when the heat-transfer plates 2a and 2b are made into a lamination | stacking state, while the opposing surface which forms 1st space X is closely_contact | adhered, a clearance gap is formed between the opposing surfaces which form 2nd space Y. The outer peripheral edge of the heat transfer plates 2a and 2b is sealed with the bent piece portion 23a, and a gap S3 that communicates with the second space Y and flows into the heat exchanger W is formed in the heat transfer plate 2a. , 2b, but is not limited to this. For example, while the facing surfaces forming the first space X are in close contact, the spacing between the facing surfaces forming the second space Y is close. The outer peripheral end portions of the heat transfer plates 2a and 2b are formed so that the annular spacer formed so as to correspond to the outer peripheral shape of the heat transfer plates 2a and 2b is interposed between the outer peripheral edge portions of the heat transfer plates 2a and 2b. Insert the spacer into each heat transfer plate 2a, 2b. It may be wearing. Even in this case, the presence of the spacer makes it possible to form the gap S3 between the outer peripheral edges of the heat transfer plates 2a and 2b and communicating with the second spaces Y, Y.

  In the above embodiment, the closed portions 22c and 22d of the first end plate 2c and the second end plate 2d are formed in a corrugated plate shape, but the present invention is not limited to this. For example, the entire closed portions 22c and 22d are flat. Of course, it may be formed in a plate shape. Even in this case, since the heat exchanger W flows into the space between the first end plate 22c and the second end plate 22d and the first end plate 22c can be cooled, the first end plate 22c A local thermal stress does not act, and it is possible to prevent the occurrence of a partial crack.

  In the said embodiment, although the concave strip 20a and the convex strip 20b were formed in both surfaces of the heat-transfer part 22a, 22b of the heat-transfer plate 2a, 2b, it is not limited to this, For example, the heat-transfer part 22a, 22b When the concave and convex portions are formed on both surfaces and the heat transfer plates 2a and 2b are overlapped, the convex portions interfere with each other and the first space X and the second space Y are interposed between the heat transfer plates 2a and 2b. May be formed alternately. That is, taking into account heat exchange efficiency and fluidity for the heat medium M and the heat exchanger W to be circulated in the first space X and the second space Y as appropriate, concave and convex portions are formed on both surfaces of the heat transfer portions 22a and 22b. What is necessary is just to form.

The whole perspective view of the plate type heat exchanger concerning one embodiment of the present invention is shown. It is AA sectional drawing of FIG. 1, Comprising: The longitudinal cross-sectional view of the plate type heat exchanger which concerns on the same embodiment is shown. The partial enlarged view of the 1st flow path vicinity of the plate type heat exchanger which concerns on the embodiment is shown. The fragmentary enlarged view of the 2nd flow path vicinity of the plate type heat exchanger which concerns on the embodiment is shown. It is a top view of the heat exchanger plate which comprises the plate type heat exchanger of the embodiment, (a) shows the top view of one heat exchanger plate, (b) is the plane of the other heat exchanger plate The figure is shown. It is a top view of the 1st end plate and the 2nd end plate which comprise the plate type heat exchanger of the embodiment, (a) shows the top view of the 1st end plate, (b) shows the 2nd The top view of an end plate is shown. Sectional drawing for demonstrating the lamination | stacking order of a frame board, a heat exchanger plate, a 1st end plate, and a 2nd end plate at the time of forming the plate type heat exchanger which concerns on the embodiment is shown. The partial enlarged view of the 1st flow path vicinity of the plate-type heat exchanger which concerns on other embodiment is shown. The fragmentary enlarged view of the 1st flow path vicinity of the plate-type heat exchanger which concerns on another embodiment is shown. An overall perspective view of a conventional plate heat exchanger is shown. It is a top view of the heat exchanger plate which the conventional plate type heat exchanger comprises, (a) shows the top view of one heat exchanger plate, (b) shows the top view of the other heat exchanger plate. Show. It is BB sectional drawing of FIG. 10, Comprising: The fragmentary enlarged view of the 1st flow path vicinity of the conventional plate type heat exchanger is shown.

Explanation of symbols

  1a, 1b ... frame plate, 2a, 2b ... heat transfer plate, 2c ... first end plate, 2d ... second end plate, 10 ... main body, 11, 23a, 23b, 23c, 23d ... bent piece, 12 , 13 ... Through hole, 14, 15 ... Connection part, 22a, 22b ... Heat transfer part, 22c, 22d ... Blocking part, 20a, 24a, 25a ... Recess (recess), 20b, 24b, 25b ... Relief (recess) ), 26a, 26b, 28a, 28b ... first opening, 26c ... flat region, 27a, 27b, 29a, 29b ... second opening, 29c ... second opening (opening), 260a, 260b, 280a, 280b ... first One annular piece (annular piece), 270a, 270b, 290a, 290b ... second annular piece (annular piece), 30 ... annular piece, 31 ... flat region, 40 ... ring body, 50 ... collar, 51 ... annular part, P1, P1 ' 1st flow path, P2, P2 '... 2nd flow path, S1, S2, S3 ... Gap (space), X ... 1st space, Y ... 2nd space, Z ... space, M ... Heating medium, W ... Heated Exchanger

Claims (7)

  A pair of first openings and a pair of second openings are formed with a predetermined interval, and a plurality of heat transfer plates in which concave portions and convex portions are formed on both surfaces are caused to interfere with each other, and are laminated. By sealing between the outer peripheral edges of the heat transfer plates, the first space through which the heat medium made of fluid flows and the second space through which the heat exchanger made of fluid flows are bordered on each heat transfer plate. A pair of first flow paths that are formed alternately and are sealed between the opening edges of the first openings of the adjacent heat transfer plates so that the first openings are connected and communicated via the first space. A pair of second flow paths are formed that are formed and sealed between the opening edges of the second openings of adjacent heat transfer plates, and the second openings are connected to each other via the second space. In the first plate heat exchanger, the opening of the first opening in the adjacent heat transfer plate Between the edges are sealed via the sealing means, plate heat exchanger, characterized in that by forming a gap which is continuous with the second space between the opening edge of the first opening in the heat transfer plate.   The sealing means is composed of an annular piece extending from the opening edge of the first opening of at least one of the adjacent heat transfer plates toward the other heat transfer plate, and the annular piece is adjacent to the other adjacent heat transfer plate. The plate-type heat exchanger according to claim 1, wherein the plate-type heat exchanger is sealed on the heat transfer plate.   The annular piece extends from the opening edge of the first opening of each heat transfer plate, the annular pieces of each heat transfer plate are fitted substantially concentrically, and the annular pieces are sealed together. 2. The plate heat exchanger according to 2.   A heat transfer plate in which one end opening of a pair of first flow paths is formed; a first end plate disposed opposite to the heat transfer plate with a gap; and a gap with respect to the first end plate. The second end plates arranged opposite to each other are overlapped and sealed between the outer peripheral edges, and the first end plate has a pair of openings corresponding to the arrangement of the second openings of the heat transfer plate. The plate type heat exchanger according to any one of claims 1 to 3, wherein the plate type heat exchanger is formed and a pair of second flow paths communicate with each other through a space between the first end plate and the second end plate.   The outer peripheral edge of each heat transfer plate is sealed with the opposing surfaces forming the first space in a stacked state in close contact with each other, and the gap communicating with the second space between the opposing surfaces forming the second space The plate type heat exchanger according to any one of claims 1 to 4, wherein the plate type heat exchanger is shaped so as to form an outer periphery and sealed between the outer peripheral edges of adjacent heat transfer plates.   A pair of first openings and a pair of second openings are formed with a predetermined interval, and a plurality of heat transfer plates in which concave portions and convex portions are formed on both surfaces are caused to interfere with each other, and are laminated. By sealing between the outer peripheral edges of the heat transfer plates, the first space through which the heat medium made of fluid flows and the second space through which the heat exchanger made of fluid flows are bordered on each heat transfer plate. A pair of first flow paths that are formed alternately and are sealed between the opening edges of the first openings of the adjacent heat transfer plates so that the first openings are connected and communicated via the first space. A pair of second flow paths are formed that are formed and sealed between the opening edges of the second openings of adjacent heat transfer plates, and the second openings are connected to each other via the second space. In the plate-type heat exchanger, a heat transfer pre in which one end openings of the pair of first flow paths are formed A first end plate that is disposed opposite to the heat transfer plate with a gap therebetween, and a second end plate that is disposed opposite to the first end plate with a gap therebetween. The first end plate is formed with a pair of openings corresponding to the arrangement of the second openings of the heat transfer plate, and the first end plate and the second end plate are sealed. A plate-type heat exchanger, wherein a pair of second flow paths communicate with each other through a space therebetween.   A pair of first openings and a pair of second openings are formed with a predetermined interval, and a plurality of heat transfer plates in which concave portions and convex portions are formed on both surfaces are caused to interfere with each other, and are laminated. By sealing the outer peripheral edges of the heat transfer plates, the first space through which the heat medium made of fluid flows and the second space through which the heat exchanger made of fluid flows are bordered by each heat transfer plate. A pair of first flow paths that are alternately formed and the first opening of adjacent heat transfer plates are sealed to each other so that the first openings are connected and communicated via the first space. A pair of second flow paths are formed in which the opening edges of the second openings of the adjacent heat transfer plates are sealed to each other and the second openings are connected to each other via the second space. In the plate type heat exchanger, the outer peripheral edge of each heat transfer plate is laminated The opposing surfaces forming the first space are sealed in close contact with each other, while the shape is set so as to form a gap continuous with the second space between the opposing surfaces forming the second space, and the adjacent heat transfer A plate type heat exchanger characterized in that a space between outer peripheral edges of the plate is sealed.

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