JP2016133253A - Plate-type heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plate-type heat exchanger in which a connecting strength between the two heat transfer plates having the second opening can be increased at an outer peripheral part of the second opening.SOLUTION: A heat transfer plate 2 having a first opening 6 comprises a first inner protrusion 7 protruded at any one side in a laminating direction X and enclosing the first opening 6; and a first outer protrusion 8 protruded at opposite side to the first inner protrusion 7 in the laminating direction X and enclosing the first inner protrusion 7. A heat transfer plate 2 having a second opening 9 comprises a second inner protrusion 11 protruded at any one side in the laminating direction X; and a second outer protrusion 12 protruded at opposite side to the second inner protrusion 11 in the laminating direction X and enclosing the second opening 9 and the second inner protrusion 11, the second inner protrusion 12 has a corresponding area 11a overlapping with the first inner protrusion 11 at least along a part 6a at the outer circumference of the first opening 6 as seen from the laminating direction X, the second outer protrusion 12 has a corresponding area 12a overlapping the first outer protrusion 8 as seen from the laminating direction X.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a plate heat exchanger that performs heat exchange between a first fluid and a second fluid.

  Conventionally, a plate heat exchanger is known as a heat exchanger that performs heat exchange between a first fluid and a second fluid. The plate heat exchanger includes a plurality of stacked heat transfer plates, and each heat transfer plate has an opening. Between the plurality of stacked heat transfer plates, a first space for circulating the first fluid and a second space for circulating the second fluid are alternately formed with each heat transfer plate as a boundary. In addition, a first flow path that allows the first fluid to flow in and out of the first space is formed by connecting the openings, and a second flow path that allows the second fluid to flow in and out of the second space is formed. . Further, the first space and the second space are defined in an airtight or liquid-tight manner by joining the heat transfer plates to each other by brazing (see, for example, Patent Document 1).

  In this type of plate heat exchanger, the opening defining the first flow path or the second flow path may differ between the heat transfer plates. Such a case occurs when, for example, the same type of heat transfer plate is turned over and rotated in the stacking direction in order to suppress an increase in the type of heat transfer plate.

  In FIG. 12, the plate heat exchanger includes a first opening 6 serving as a reference and a second opening 9 having a region located outside the first opening 6 as the opening. In FIG. 12, a pair of heat transfer plates 2 and 2 having a first opening 6 and a pair of heat transfer plates 2 and 2 having a second opening 9 are alternately stacked. The heat transfer plate 2 having the first opening 6 includes a first inner bulging portion 7 and a first outer bulging portion 8 that surround the first opening 6 and bulge on opposite sides in the stacking direction X. And in the adjacent heat-transfer plate 2, the 1st inner side protruding parts 7 and 7 which oppose each other are joined, and the 2nd outer side protruding parts 8 and 8 which oppose each other are also joined. On the other hand, the heat transfer plate 2 having the second opening 9 includes a second outer protruding portion 12 that surrounds the second opening 9 and protrudes to one side in the stacking direction X. And in the adjacent heat-transfer plate 2, the 2nd outer side protruding parts 12 and 12 which oppose each other are joined.

JP 2005-326072 A

  However, in the case of the above-described configuration, since the second opening 9 spreads outside the first opening 6, a local recess is formed between the second openings 9, 9 of the two adjacent heat transfer plates 2. Has been. As a result, the joint 30 between the two heat transfer plates 2 and 2 facing the recess has a force applied to the outer peripheral portion of the second opening 9 by the pressure of the fluid (first fluid or second fluid) and the first Both the force applied to the outer peripheral part of one opening 6 are added. There is a possibility that the joint 30 is separated by these forces. For this reason, it is desired to increase the bonding strength between the two heat transfer plates 2 and 2 having the second opening in the outer peripheral portion of the second opening 9 so that the two adjacent heat transfer plates 2 and 2 are not separated. It is rare.

  Therefore, the subject of this invention is providing the plate type heat exchanger which can raise the joint strength between the two heat exchanger plates which have a 2nd opening in the outer peripheral part of a 2nd opening.

  The plate heat exchanger according to the present invention includes a plurality of stacked heat transfer plates, each of which has a first space for flowing a first fluid between a plurality of heat transfer plates each having an opening. The second space through which the two fluids are circulated is alternately formed with each heat transfer plate as a boundary, and the first flow path for forming the first fluid in and out of the first space is formed by connecting the openings. A second flow path for allowing the second fluid to flow in and out of the two spaces is formed, and the first space and the second space are defined airtight or liquid tight by joining the heat transfer plates together by brazing. In the plate heat exchanger, as the opening, a second opening having a reference first opening, a region overlapping the first opening when viewed from the stacking direction, and a region located outside the first opening. And when viewed from the stacking direction, the first opening At least a part of the circumference is on or outside the outer periphery of the second opening, and has a heat transfer plate having the first opening and a second opening on both sides in the stacking direction of the at least one heat transfer plate having the second opening. Each of the heat transfer plates, each having a first opening, has a first inner bulge portion that protrudes on one side in the stacking direction and surrounds the first opening, and a first inner bulge portion in the stacking direction. And a heat transfer plate having a second opening, the second inner bulge projecting on either side in the stacking direction. And a second outer ridge that bulges on the opposite side of the second inner ridge in the stacking direction and surrounds the second opening and the second inner ridge, and the second inner ridge is viewed from the stacking direction. The at least part of the outer periphery of the first opening The second outer ridge has a region overlapping with the first outer ridge when viewed from the stacking direction, and the two adjacent heat transfer plates have a region overlapping with the first inner ridge. The first outer ridge and the second outer ridge facing each other are joined, and the second inner ridges facing each other in two adjacent heat transfer plates are joined.

  According to this configuration, the outer peripheral portion of the second opening in the at least one heat transfer plate is supported by the other heat transfer plate from both sides in the stacking direction.

  Therefore, the plate heat exchanger according to the present invention can increase the bonding strength between the two heat transfer plates having the second opening at the outer periphery of the second opening.

  As an aspect of the plate heat exchanger according to the present invention, the center of the second opening may be different from the center of the first opening.

  According to such a configuration, when the first fluid or the second fluid flows into the first space or the second space from the first channel or the second channel, the first fluid or the second fluid is in the first opening. It is guided from the center toward the center of the second opening.

  Therefore, the plate heat exchanger according to the present invention can guide the flow direction of the first fluid or the second fluid flowing from the first flow path or the second flow path into the first space or the second space in a specific direction. .

  As one aspect of the plate heat exchanger according to the present invention, the first opening has a first non-overlapping region located outside the second opening when viewed from the stacking direction, and has a second opening. The heat plate is provided with an additional ridge that protrudes on the side opposite to the second inner ridge in the stacking direction in a region corresponding to the first non-overlapping region when viewed from the stacking direction, and two adjacent heat transfer plates The additional ridges facing each other in may be joined.

  According to this configuration, the outer peripheral portion of the second opening in the at least one heat transfer plate is further supported by the other heat transfer plate from any one side in the stacking direction.

  Therefore, the plate heat exchanger according to the present invention can further increase the bonding strength between the two heat transfer plates having the second opening at the outer peripheral portion of the second opening.

  The plate heat exchanger according to the present invention can increase the bonding strength of two heat transfer plates having the second opening at the outer peripheral portion of the second opening.

1 is a schematic overall perspective view of a plate heat exchanger according to a first embodiment. It is a top view of the heat-transfer plate which concerns on 1st embodiment which shows the outer peripheral part of the 1st opening seen from the lamination direction. It is a longitudinal cross-sectional view of the plate type heat exchanger which concerns on the reference example which shows the outer peripheral part of a 1st opening. It is a top view of the heat-transfer plate which concerns on 1st embodiment which shows the outer peripheral part of the 2nd opening seen from the lamination direction. It is a longitudinal cross-sectional view of the plate type heat exchanger which concerns on the reference example which shows the outer peripheral part of a 2nd opening. It is a longitudinal cross-sectional view of the plate type heat exchanger which concerns on 1st embodiment which shows the outer peripheral part of a 1st opening and a 2nd opening. It is a top view of the heat-transfer plate which concerns on 2nd embodiment which shows the outer peripheral part of the 2nd opening seen from the lamination direction. It is a top view of the heat-transfer plate which concerns on 3rd embodiment which shows the outer peripheral part of the 2nd opening seen from the lamination direction. It is a top view of the heat-transfer plate which concerns on 4th embodiment which shows the outer peripheral part of the 2nd opening seen from the lamination direction. It is a top view of the heat-transfer plate which concerns on 5th embodiment which shows the outer peripheral part of the 2nd opening seen from the lamination direction. It is a longitudinal cross-sectional view of the plate type heat exchanger which concerns on 5th embodiment which shows the outer peripheral part of a 1st opening and a 2nd opening. It is a longitudinal cross-sectional view of the conventional plate type heat exchanger which shows the outer peripheral part of a 1st opening and a 2nd opening.

  Hereinafter, a plate heat exchanger according to an embodiment of the present invention will be described with reference to the drawings. In the following embodiments, the same or corresponding parts are denoted by the same reference numerals, and description of the configuration of these parts is not basically repeated.

  FIG. 1 is a schematic overall perspective view of a plate heat exchanger according to the first embodiment. In FIG. 1, a plate heat exchanger 1 according to the first embodiment includes a main body 3 having a plurality of stacked heat transfer plates 2.

  As shown in FIG. 6, each heat transfer plate 2 is formed by press-molding a metal plate and has openings (6, 9). Between the plurality of stacked heat transfer plates 2, a first space S <b> 1 for circulating the first fluid A and a second space S <b> 2 for circulating the second fluid B are alternately formed with each heat transfer plate 2 as a boundary. ing. Further, the openings (6, 9) are connected to form the first flow path 10 through which the first fluid A flows in and out of the first space S1, and the second fluid B flows out of the second space S2. The 2nd flow path to enter is formed. Furthermore, the first space S1 and the second space S2 are defined in an airtight or liquid-tight manner by joining the heat transfer plates 2 to each other by brazing. Since the second channel is configured in the same manner as the first channel 10, the second channel is not shown.

  In FIG. 1, the plate heat exchanger 1 includes a pair of end plates 4 and 5 that sandwich a main body 3. Each of the end plates 4 and 5 is formed by press-molding a metal plate. One end plate 4 includes a pair of openings 41 and 41 respectively corresponding to the two first flow paths 10 for inflow and outflow of the first fluid A to the main body 3, and inflow of the second fluid B to the main body 3 and And a pair of openings 42 and 42 respectively corresponding to the two second flow paths for outflow. The other end plate 5 closes the flow paths of the first fluid A and the second fluid B formed in the main body 3.

  The plate heat exchanger 1 has a first opening 6 (FIG. 2) serving as a reference and a region (92) located outside the first opening 6 as the opening formed in the heat transfer plate 2. And an opening 9 (FIG. 4). This will be described in detail below.

  FIG. 2 is a plan view of the heat transfer plate according to the first embodiment showing the outer periphery of the first opening viewed from the stacking direction. In FIG. 2, the hatched area indicates the first opening 6. When viewed from the stacking direction X, the first opening 6 has a circular shape.

  FIG. 3 is a longitudinal sectional view of a plate heat exchanger according to a reference example showing an outer peripheral portion of the first opening. In FIG. 3, the heat transfer plate 2 having the first opening 6 is laminated. For example, the first flow path 10 is formed by connecting the first openings 6. The heat transfer plate 2 having the first opening 6 has a first inner bulging portion 7 that bulges on one side in the stacking direction X and surrounds the first opening 6, and a first inner bulging portion 7 in the stacking direction X. Comprises a first outer ridge 8 that bulges on the opposite side and surrounds the first inner ridge 7. The first inner raised portions 7 and 7 facing each other in the stacking direction X are joined, and the first outer raised portions 8 and 8 facing each other in the stacking direction X are also joined.

  Since the region between the two first openings 6 and 6 of the two adjacent heat transfer plates 2 and 2 is sealed, the region between the two first openings 6 and 6 includes the first space S1 and the second space. It is blocked from the space S2.

  FIG. 4 is a plan view of the heat transfer plate according to the first embodiment showing the outer periphery of the second opening as viewed from the stacking direction. In FIG. 4, the hatched area indicates the second opening 9. The second opening 9 has an overlapping region 91 that overlaps the first opening 6 and a second non-overlapping region 92 that is located outside the first opening 6 when viewed from the stacking direction X. When viewed from the stacking direction X, at least a part 6 a of the outer periphery of the first opening 6 is on or on the outer periphery of the second opening 9. In FIG. 4, at least a part 6 a of the outer periphery of the first opening 6 occupies half of the outer periphery of the first opening 6 and is outside the second opening 9. Further, the second non-overlapping area 92 is connected to the overlapping area 91. The second opening 9 has a semicircular shape, the overlapping region 91 has a semicircular shape, and the second non-overlapping region 92 has an arc shape having a certain width.

  In FIG. 4, the second opening 9 is disposed at a position biased with respect to the first opening 6 when viewed from the stacking direction X. The second opening 9 has a shape different from the shape of the first opening 6. As a result, the center (centroid) 9G of the second opening 9 is different from the center (centroid) 6G of the first opening 6.

  FIG. 5 is a longitudinal sectional view of a plate heat exchanger according to a reference example showing an outer peripheral portion of the second opening. In FIG. 5, the heat transfer plate 2 having the second opening 9 is laminated. For example, the first flow path 10 is formed by connecting the first openings 9. The heat transfer plate 2 having the second opening 9 is protruded on the opposite side of the second inner protruding portion 11 in the stacking direction X and the second inner protruding portion 11 protruding on either side of the stacking direction X, and A second outer ridge 12 surrounding the two openings 9 and the second inner ridge 11.

  As shown in FIG. 4, the second inner raised portion 11 corresponds to the first inner raised portion 7 along the at least part 6 a of the outer periphery of the first opening 6 when viewed from the stacking direction X. It has the area | region 11a. The second inner raised portion 11 has a non-corresponding region 11b in addition to the corresponding region 11a. The second inner raised portion 11 has a semicircular shape. The corresponding region 11a is located outside the part 6a and has an arc shape having a certain width. The non-corresponding region 11b is located inside the part 6a and has a semicircular shape. Further, the second outer raised portion 12 has a corresponding region overlapping with the first outer raised portion 8 when viewed from the stacking direction X. In FIG. 4, the entire second outer raised portion 12 is a corresponding region of the second outer raised portion 12.

  As shown in FIG. 5, the two second inner ridges 11, 11 facing each other in the stacking direction X are joined, and the two second outer ridges 12, 12 facing each other in the stacking direction X are also joined. Has been.

  In the cross section shown in FIG. 5, the region between the two second openings 9 and 9 of the two adjacent heat transfer plates is closed. The region between the two second openings 9, 9 may be sealed or partially opened. For example, by forming an opening on the heat transfer plate 2 having the second opening 9 on the outside of the second outer raised portion 12, the region between the two second openings 9, 9 can be communicated with the first space S1. it can. In addition, the area | region between the two 2nd openings 9 and 9 is interrupted | blocked with respect to 2nd space S2.

  FIG. 6 is a longitudinal sectional view of the plate heat exchanger according to the first embodiment showing the outer periphery of the first opening and the second opening. In FIG. 6, the pair of heat transfer plates 2 and 2 having the first opening 6 and the pair of heat transfer plates 2 and 2 having the second opening 9 are alternately stacked. For example, the first flow path 10 is formed by connecting the first opening 6 and the first opening 9. Moreover, the 1st opening 6 and the 1st opening 9 may continue, and a 2nd flow path may be formed. As described above, the second inner raised portion 11 and the second outer raised portion 12 are configured to overlap the first inner raised portion 7 and the first outer raised portion 8 as seen from the stacking direction X, respectively. Yes. The first inner raised portion 7 and the second inner raised portion 11 facing each other in the stacking direction X are joined, and the first outer raised portion 8 and the second outer raised portion 12 facing each other in the stacking direction X are also joined. Has been. As a result, the outer peripheral portion of the second opening 9 in the at least one heat transfer plate 2 is supported by the other heat transfer plates 2 and 2 from both sides in the stacking direction X.

  Since the region between the first opening 6 and the second opening 9 of the two adjacent heat transfer plates 2 and 2 is sealed, the region between the first opening 6 and the second opening 9 is the first space S1 and It is blocked with respect to the second space S2.

  With reference to FIG. 7, the plate type heat exchanger 1 which concerns on 2nd embodiment is demonstrated. FIG. 7 is a plan view of the heat transfer plate according to the second embodiment showing the outer periphery of the second opening as viewed from the stacking direction. In the second embodiment, the overlapping region 91 has a circular shape that completely overlaps the first opening 6. In the second embodiment, at least a part 6 a of the outer periphery of the first opening 6 occupies half of the outer periphery of the first opening 6 and is on the outer periphery of the second opening 9. The center 9G of the second opening 9 is also different from the center 6G of the first opening 6.

  With reference to FIG. 8, the plate-type heat exchanger 1 which concerns on 3rd embodiment is demonstrated. FIG. 8 is a plan view of the heat transfer plate according to the third embodiment showing the outer periphery of the second opening as viewed from the stacking direction. In the third embodiment, the second opening 9 includes a plurality of overlapping regions 91 having a circular shape that completely overlaps the first opening 6, and a plurality of discontinuous and equally spaced along the outer periphery of the first opening 6. A second non-overlapping region 92. Each second non-overlapping area 92 has a quadrangular shape and extends from the overlapping area 91 in the radial direction. Further, at least a part 6 a of the outer periphery of the first opening 6 is on the outer periphery of the second opening 9 and is discontinuously arranged at equal intervals. In the third embodiment, since the shape of the second opening 9 is point-symmetric with respect to the center of the first opening 6, the center 9 </ b> G of the second opening 9 coincides with the center 6 </ b> G of the first opening 6.

  With reference to FIG. 9, the plate-type heat exchanger 1 which concerns on 4th embodiment is demonstrated. FIG. 9 is a plan view of the heat transfer plate according to the fourth embodiment showing the outer periphery of the second opening as viewed from the stacking direction. In the fourth embodiment, the second opening 9 includes a plurality of overlapping regions 91 having a circular shape that completely overlaps the first opening 6, and a plurality of discontinuous and equally spaced along the outer periphery of the first opening 6. And a second non-overlapping region 92. The plurality of second non-overlapping regions 92 have a quadrangular shape, are separated from the overlapping region 91, and are separate from the overlapping region 91. For this reason, the entire outer periphery (at least part) 6 a of the first opening 6 is on the outer periphery of the second opening 9. In the fourth embodiment, since the shape of the second opening 9 is point-symmetric with respect to the center of the first opening 6, the center 9 </ b> G of the second opening 9 coincides with the center 6 </ b> G of the first opening 6.

  With reference to FIG. 10, FIG. 11, the plate type heat exchanger 1 which concerns on 5th embodiment is demonstrated.

  FIG. 10 is a plan view of the heat transfer plate according to the fifth embodiment showing the outer periphery of the second opening as viewed from the stacking direction. In FIG. 10, the hatched area indicates the second opening 9. The second opening 9 according to the fifth embodiment has the same shape as the second opening 9 according to the first embodiment. Here, the first opening 6 has a first non-overlapping region 61 located outside the second opening 9 when viewed from the stacking direction X. The heat transfer plate 2 having the second opening 9 is added to the region corresponding to the first non-overlapping region 61 when viewed from the stacking direction X, and protrudes in the stacking direction X on the side opposite to the second inner protruding portion 11. A raised portion 13 is provided.

  FIG. 11 is a longitudinal sectional view of a plate heat exchanger according to the fifth embodiment showing the outer peripheries of the first opening and the second opening. In FIG. 11, the heat transfer plate 2 having the second opening 9 is laminated. Although not shown, the heat transfer plate 2 having the first opening 6 is also arranged adjacent to the heat transfer plate 2 having the second opening 9 as in FIG. When viewed from the stacking direction X, the additional raised portions 13 and 13 in the two different heat transfer plates 2 and 2 overlap each other. In the two adjacent heat transfer plates 2 and 2, the additional raised portions 13 and 13 that face each other are joined. As a result, the portion where two adjacent heat transfer plates 2 and 2 are joined increases in the outer peripheral portion of the second opening 9. In the fifth embodiment, the entire second inner raised portion 11 overlaps with the first inner raised portion 7.

  The operation and effect of the plate heat exchanger according to this embodiment will be described.

  In the plate heat exchanger 1 according to each of the first to fifth embodiments, a plurality of stacked heat transfer plates 2, each of which has an opening (6, 9). Between the plates 2, a first space S <b> 1 in which the first fluid A is circulated and a second space S <b> 2 in which the second fluid B is circulated are alternately formed with each heat transfer plate 2 as a boundary. Each opening (6, 9) is connected to form a first flow path 10 through which the first fluid A flows in and out of the first space S1, and the second fluid B flows in and out of the second space S2. A second flow path is formed. By joining the heat transfer plates 2 by brazing, the first space S1 and the second space S2 are airtight or liquid tight. The plate heat exchanger 1 includes a first opening 6 serving as a reference as the openings (6, 9), an overlapping region 91 overlapping with the first opening 6 when viewed from the stacking direction X, and a first opening. 6 and a second opening 9 having a second non-overlapping region 92 located outside of. When viewed from the stacking direction X, at least a part 6 a of the outer periphery of the first opening 6 is on or on the outer periphery of the second opening 9. The heat transfer plate 2 having the first opening 6 and the heat transfer plate 2 having the second opening 9 are respectively disposed on both sides in the stacking direction X of the at least one heat transfer plate 2 having the second opening 9. The heat transfer plate 2 having the first opening 6 has a first inner bulging portion 7 that bulges on one side in the stacking direction X and surrounds the first opening 6, and a first inner bulging portion 7 in the stacking direction X. Comprises a second outer ridge 8 that bulges on the opposite side and surrounds the first inner ridge 7. The heat transfer plate 2 having the second opening 9 is protruded on the opposite side of the second inner protruding portion 11 in the stacking direction X and the second inner protruding portion 11 protruding on either side of the stacking direction X, and A second opening 9 and a second outer ridge 12 surrounding the second inner ridge 11. The second inner raised portion 12 has a corresponding region 11a that overlaps with the first inner raised portion 7 along the at least part 6a of the outer periphery of the first opening 6 when viewed from the stacking direction X. The outer protruding portion 12 has a corresponding region (12) that overlaps with the first outer protruding portion 8 when viewed from the stacking direction X. In the two adjacent heat transfer plates 2 and 2, the first outer raised portion 7 and the second outer raised portion 11 facing each other are joined. In the two adjacent heat transfer plates 2, 2, the second inner raised portions 12, 12 facing each other are joined.

  According to this configuration, the outer peripheral portion of the second opening 9 in the at least one heat transfer plate 2 is supported by the other heat transfer plates 2 and 2 from both sides in the stacking direction X.

  Therefore, the plate heat exchanger 1 according to each of the first to fifth embodiments increases the bonding strength between the two heat transfer plates 2 and 2 having the second opening 9 in the outer peripheral portion of the second opening 9. be able to.

  In the plate heat exchanger 1 according to each of the first, second, and fifth embodiments, the center 9G of the second opening 9 is different from the center 6G of the first opening 6.

  According to this configuration, when the first fluid A or the second fluid B flows into the first space S1 or the second space S2 from the first channel 10 or the second channel, the first fluid A or the second fluid B is guided from the center 6G of the first opening 6 toward the center 9G of the second opening 9.

  Therefore, the plate heat exchanger 1 according to each of the first, second, and fifth embodiments is the first fluid that flows into the first space S1 or the second space S2 from the first flow path 10 or the second flow path. The flow direction of A or the second fluid B can be guided in a specific direction.

  In the plate heat exchanger 1 according to the fifth embodiment, the first opening 6 has a first non-overlapping region 61 positioned outside the second opening 9 when viewed from the stacking direction X, and the second The heat transfer plate 2 having the opening 9 is an additional bulge portion that bulges in a region corresponding to the first non-overlapping region 61 when viewed from the lamination direction X, on the side opposite to the second inner bulge portion 11 in the lamination direction X. 13 and the additional ridges 13 and 13 facing each other in the two adjacent heat transfer plates 2 and 2 are joined.

  According to this configuration, the outer peripheral portion of the second opening 9 in the at least one heat transfer plate 2 is further supported by the other heat transfer plate 2 from any one side in the stacking direction X.

  Therefore, the plate heat exchanger 1 according to the fifth embodiment can further increase the bonding strength between the two heat transfer plates 2 and 2 having the second opening 9 in the outer peripheral portion of the second opening 9. .

  In addition, the plate type heat exchanger which concerns on this invention is not limited to the said embodiment, A various change can be added in the range which does not deviate from the summary of this invention.

  In the above embodiment, the first opening 6 and the second opening 9 are applied as the openings that define the first flow path 10. However, the first openings 6 and the second openings 9 are defined as the openings that define the second flow path. May be applied, and the first opening 6 and the second opening 9 may be applied as openings that define both the first flow path 10 and the second flow path. Moreover, what is necessary is just to apply the 1st opening 6 and the 2nd opening 9 as an opening which demarcates the 1st flow path 10 or the 2nd flow path in at least one part of the 1st flow path 10 and the 2nd flow path. In a part of the first flow path 10 and the second flow path, an opening similar to the conventional case may be applied as the opening that defines the first flow path 10 or the second flow path. Further, a part of the first flow path 10 and the second flow path is formed only by the region defined by only the first opening 6 and / or the second opening 9 as in the reference example (FIGS. 3 and 5). It may include a defined area.

  In the second opening 9, the second non-overlapping region 92 may be integrated with or separated from the overlapping region 91. In the fourth embodiment (FIG. 9), the plurality of second non-overlapping regions 92 are separate from the overlapping region 91 and are arranged point-symmetrically with respect to the center of the first opening 6. Instead of this configuration, one or a plurality of second non-overlapping regions 92 may be separated from the overlapping region 91 and may be arranged so as to be biased with respect to the center 6G of the first opening 6. That is, the center of gravity of the second opening 9 may be different from the center of gravity of the first opening.

DESCRIPTION OF SYMBOLS 1 ... Plate type heat exchanger, 2 ... Heat transfer plate, 3 ... Main part, 4 ... End plate, 5 ... End plate, 6 ... First opening (opening), 6a ... Outer periphery, 6G ... Center, 7 ... First Inner ridge, 8 ... first outer ridge, 9 ... second opening (opening), 9G ... center, 10 ... first flow path, 11 ... second inner ridge, 11a ... corresponding region, 11b ... non-corresponding region, DESCRIPTION OF SYMBOLS 12 ... 2nd outer side bulge part, 13 ... Additional bulge part, 30 ... Joint part, 41 ... Opening, 42 ... Opening, 61 ... 1st non-overlapping area | region, 91 ... Overlapping area | region, 92 ... 2nd non-overlapping area | region, A ... First fluid, B ... second fluid, S1 ... first space, S2 ... second space, X ... stacking direction

Claims (3)

A plurality of stacked heat transfer plates, each of which has a first space for circulating the first fluid and a second space for circulating the second fluid between the plurality of heat transfer plates each having an opening. Formed alternately with the heat transfer plate as a boundary, each opening is connected to form a first flow path for flowing the first fluid into and out of the first space, and the second fluid flows into and out of the second space. In the plate heat exchanger in which the second flow path is formed and the first space and the second space are defined in an airtight or liquid tight manner by joining the heat transfer plates together by brazing,
As the opening, a first opening serving as a reference, a second opening having an overlapping region overlapping the first opening and a second non-overlapping region located outside the first opening when viewed from the stacking direction, When viewed from the stacking direction, at least a part of the outer periphery of the first opening is on or outside the outer periphery of the second opening,
The heat transfer plate having the first opening and the heat transfer plate having the second opening are respectively disposed on both sides in the stacking direction of the at least one heat transfer plate having the second opening,
The heat transfer plate having the first opening is raised on either side of the stacking direction and surrounds the first opening, and is raised on the opposite side of the first inner protrusion in the stacking direction, and A first outer ridge surrounding the first inner ridge,
The heat transfer plate having the second opening has a second inner protruding portion that protrudes on one side in the stacking direction, and protrudes on the opposite side of the second inner protruding portion in the stacking direction. A second outer raised portion surrounding the raised portion, the second inner raised portion overlapping the first inner raised portion along the at least part of the outer periphery of the first opening when viewed from the stacking direction. Having a corresponding region, the second outer ridge has a corresponding region overlapping with the first outer ridge when viewed from the stacking direction;
The first outer ridges and the second outer ridges facing each other in the two adjacent heat transfer plates are joined, and the second inner ridges facing each other in the two adjacent heat transfer plates are joined. A plate-type heat exchanger.   The plate heat exchanger according to claim 1, wherein the center of the second opening is different from the center of the first opening. The first opening has a first non-overlapping region located outside the second opening when viewed from the stacking direction,
The heat transfer plate having the second opening includes an additional ridge that protrudes on the side opposite to the second inner ridge in the stacking direction in a region corresponding to the first non-overlapping region when viewed from the stacking direction. The plate type heat exchanger according to claim 1 or 2, wherein the additional ridges facing each other in the two matching heat transfer plates are joined.

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