JP6390292B2 - Plate heat exchanger - Google Patents

Description

  The present invention relates to a plate heat exchanger.

  In the plate heat exchanger disclosed in the following Patent Document 1, first, two heat transfer plates (2) are joined together by laser welding to form a plate pair (16) (FIG. 3). Each heat transfer plate (2) comprises an outer edge portion (10), an inner edge portion (11), and four port portions (14 ', 14 ", 15', 15"), each port portion having a port. Holes (12 ′, 12 ″, 13 ′, 13 ″) are formed (FIG. 2). When the plate pair (16) is formed, the pair of heat transfer plates (2) are overlapped to be in contact with each other along the inner edge portion (11) and the port portion (14 ', 14 "), and the inner edge It is welded (19) along the part (11) and welded (18) along the port part (14 ′, 14 ″) (FIG. 3). Thereafter, the plate pairs (16) are overlapped, welded (21) along the outer edge portion (10), and welded (22) along the port portions (15 ', 15 ").

Japanese translation of PCT publication No. 2002-518185 (FIGS. 2 to 4)

  However, the conventional plate heat exchanger has a flat plate nozzle flange (port part) formed at the four corners of the heat transfer plate (heat transfer plate), and a nozzle hole (port hole) formed in the nozzle flange. Met. In the case of such a configuration, the overlapping portions of the nozzle flanges are arranged apart from each other in the axial direction of the nozzle holes, and there are places where gaps are arranged between the nozzle flanges. Therefore, when the nozzle flanges are overlapped and welded, if the heat transfer plate is pressed in the stacking direction, the heat transfer plate (especially the nozzle flange) may bend and the target position of the laser beam may shift, preventing proper welding. was there.

  Therefore, the problem to be solved by the present invention is to provide a plate heat exchanger that can prevent the heat transfer plate from being deformed in the laminating direction and can perform laser welding easily and reliably.

The present invention has been made in order to solve the above-mentioned problems. The invention according to claim 1 is characterized in that a plurality of heat transfer plates are superposed, a fluid flow path is provided between adjacent heat transfer plates, and an adjacent fluid flow is provided. A plate-type heat exchanger assembled so that two fluids to be heat-exchanged flow through the passage, wherein each heat transfer plate is provided with a nozzle flange as a fluid inlet / outlet port to the fluid flow path Are provided at four or more locations, and each of the superposed heat transfer plates, excluding the heat transfer plates at both ends in the stacking direction, is adjacent to one of the heat transfer plates and at least two of the four locations. In the first corresponding position, the nozzle flanges are overlapped with each other, while the other adjacent heat transfer plate and the two corresponding positions excluding the first corresponding position of the four or more positions. Oh The nozzle flanges are overlapped with each other, and the gap between the nozzle flanges spaced apart in the axial direction of the nozzle hole is separated from the fluid flow path between the heat transfer plates forming the gap. while ensuring the communication between the nozzle holes of the nozzle flange, or both nozzle flange abutting the spacer is provided, are projections of contact formed with each other from both nozzle flange, wherein the heat transfer plate, the outer peripheral portion An outer flange provided along the outer flange, and an inner flange provided with a step inside the outer flange. Each of the heat transfer plates is provided with the substantially circular nozzle flange on the inner side of the inner flange. The nozzle flange is formed with a circular nozzle hole as a fluid inlet / outlet to the fluid flow path, and the first corresponding position is formed. The nozzle flange is formed at the same height as the outer flange, and at the second corresponding position, the nozzle flange is formed at the same height as the inner flange. One adjacent heat transfer plate and the outer flange are overlapped and the nozzle flange at the first corresponding position is overlapped, while the other adjacent heat transfer plate and the inner flange are overlapped. In addition, the nozzle flanges at the second corresponding positions are overlapped with each other, and a fluid flow between the heat transfer plates forming the gap is formed in a gap between the nozzle flanges that are spaced apart in the axial direction of the nozzle hole. An annular spacer that abuts both nozzle flanges while ensuring communication between the path and the nozzle holes of the separated nozzle flanges Is provided, or the protrusions that come into contact with each other from both nozzle flanges are formed at a plurality of locations in the circumferential direction of the nozzle hole .

  According to the first aspect of the present invention, the spacers that are in contact with both nozzle flanges are provided in the gaps between the nozzle flanges that are spaced apart in the axial direction of the nozzle holes, or are in contact with each other from both nozzle flanges. Since the protrusion is formed, the rigidity of the nozzle flange can be improved. As a result, for example, even when the heat transfer plates are welded together with a jig in the stacking direction, the heat transfer plates are not easily bent, and laser welding can be easily and reliably performed. Moreover, the spacers and the protrusions do not hinder the communication between the fluid flow path between the heat transfer plates provided with the spacers and the nozzle holes of the nozzle flange.

According to the invention described in claim 1 , the nozzle flange is formed at the same height as the outer flange at two or more first corresponding positions among the four or more nozzle flanges, while the other two or more positions. In the second corresponding position, the nozzle flange is formed at the same height as the inner flange. Therefore, while overlapping the outer flanges, the nozzle flanges at the first corresponding position at the same height are also overlapped, while the nozzle flanges at the second corresponding position at the same height are also overlapped while the inner flanges are overlapped. Can be overlapped. The spacers between the nozzle flanges are formed in an annular shape, or protrusions formed on the nozzle flange are provided at a plurality of locations in the circumferential direction of the nozzle holes. In this way, a plate type heat exchanger having high rigidity can be easily configured.

According to a second aspect of the present invention, the spacer is formed of a ring-shaped member formed in a waveform in the circumferential direction, the outer diameter is larger than the nozzle hole, and the wave height is between the nozzle flanges. The plate heat exchanger according to claim 1 , wherein the plate heat exchanger corresponds to a separation dimension.

According to the invention described in claim 2 , since the spacer is formed from an annular member formed in a waveform in the circumferential direction, it is easy to manufacture.

According to a third aspect of the present invention, the spacer is formed of an annular member in which notches are formed along a radial direction at a plurality of locations in the circumferential direction, and an outer diameter thereof is larger than that of the nozzle hole. The plate heat exchanger according to claim 1 , wherein the thickness corresponds to a separation dimension between the nozzle flanges.

According to invention of Claim 3 , since a spacer is formed from the annular member by which the notch was formed along the radial direction in multiple places of the circumferential direction, manufacture is easy.

Further, in the invention according to claim 4 , the protrusion is press-molded so as to swell substantially hemispherically from the nozzle flange, and the protrusion is located at a position surrounding the nozzle hole and facing each other. The plate-type heat exchanger according to claim 1 , wherein the plate-type heat exchanger is provided at equal intervals in the circumferential direction at positions corresponding to the nozzle flange.

According to invention of Claim 4 , the protrusion which supports the nozzle flange which faces is formed in the position which surrounds a nozzle hole, and the position corresponding with both nozzle flanges, and is also substantially hemispherical at equal intervals in the circumferential direction. Since it is press-molded so that it swells, it is easy to manufacture.

  According to the plate heat exchanger of the present invention, it is possible to easily and reliably perform laser welding by preventing deformation of the heat transfer plate in the stacking direction.

It is the schematic which shows an example of two types of heat-transfer plates which comprise the plate type heat exchanger of one Example of this invention. It is a schematic perspective view which shows the lamination | stacking state of the upper left part of FIG. 1, and it is going to overlap | superpose a 1st heat exchanger plate on it further, after superposing | stacking a 2nd heat exchanger plate on the 1st heat exchanger plate and welding. It shows the state to do. It is a schematic perspective view which shows the lamination | stacking state of the upper right part of FIG. 1, and after superimposing the 2nd heat transfer plate on the 1st heat transfer plate and welding, it is going to overlap | superpose the 1st heat transfer plate on it further It shows the state to do. It is a schematic sectional drawing at the time of manufacturing a plate type heat exchanger while carrying out laser welding by superimposing each heat-transfer plate of FIG. 1 alternately, and has shown the 1st corresponding position of FIG. It is an enlarged view of the lower left part of FIG. It is a figure which shows the modification of FIG. It is the schematic which shows the example which provided the protrusion in the nozzle flange of the heat exchanger plate of FIG. 1, and has shown only a part of heat exchanger plate. It is a schematic sectional drawing (VIII-VIII sectional drawing) which shows the lamination | stacking state of the heat-transfer plate of FIG. It is a schematic perspective view which shows an example of the spacer provided in the clearance gap between the nozzle flanges of the heat-transfer plate of FIG. It is a schematic sectional drawing which shows the lamination | stacking state of the heat-transfer plate through the spacer of FIG. It is a schematic perspective view which shows the modification of the spacer of FIG.

  Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. Here, a case where a plate heat exchanger is manufactured by stacking a plurality of heat transfer plates on top and bottom will be described, but this is for convenience of explanation, and the posture of the plate heat exchanger (particularly during use) It is not intended to limit the attitude).

  FIG. 1 is a schematic view showing an example of two types of heat transfer plates 1 and 2 constituting a plate heat exchanger according to an embodiment of the present invention.

  The plate type heat exchanger of the present embodiment is configured by stacking a plurality of (typically four or more) first heat transfer plates 1 and second heat transfer plates 2 alternately. The heat transfer plates 1 and 2 are stacked one above the other and assembled while laser welding is performed at a required portion. Each of the heat transfer plates 1 and 2 is formed of a substantially rectangular metal plate, and appropriate irregularities and holes are pressed on the plate surface to have external dimensions and plate thicknesses corresponding to each other.

  As a metal plate which comprises each heat-transfer plate 1 and 2, the thing thinner than the thing of the conventional general plate heat exchanger can be used suitably. Specifically, in a conventional plate heat exchanger, a heat transfer plate having a thickness of 0.5 to 1 mm is generally used, but in the plate heat exchanger of the present invention, 0.2 to 0.00 mm. Heat transfer plates 1 and 2 having a thickness of 5 mm (0.3 mm in this embodiment) can also be used.

  FIG. 2 is a schematic perspective view showing a stacked state of the upper left portion of FIG. 1. After the second heat transfer plate 2 is overlapped on the first heat transfer plate 1 and welded, the first heat transfer is further formed thereon. A state in which the plates 1 are to be overlapped is shown. FIG. 3 is a schematic perspective view showing the stacked state of the upper right part of FIG. 1, after the second heat transfer plate 2 is superposed on the first heat transfer plate 1 and welded, and further on the first heat transfer plate 1. The state which is going to overlap | superpose the heat-transfer plate 1 is shown. In addition, in each figure, the codes | symbols 3 and 4 have shown the welding part (penetration part) by a lap weld joint.

Hereinafter, the heat transfer plates 1 and 2 will be specifically described with reference to FIGS. 1 to 3.
First, the first heat transfer plate 1 will be described. The first heat transfer plate 1 includes an outer flange 5 provided along the outer peripheral portion, an inner flange 6 provided with a step inside the outer flange 5, and a connecting wall 7 that connects both flanges 5, 6. . The outer flange 5 and the inner flange 6 are flat and arranged in parallel, and a connecting wall 7 is provided preferably perpendicularly to the flanges 5 and 6.

  Since the first heat transfer plate 1 has a substantially rectangular shape, the outer flange 5 has a substantially rectangular frame shape. The outer flange 5 is formed with a predetermined width along the outer periphery of the first heat transfer plate 1. A connecting wall 7 is provided on the inner peripheral edge of the outer flange 5 so as to be bent substantially perpendicular to the plate surface of the outer flange 5. An end of the connecting wall 7 extending from the outer flange 5 by a predetermined dimension is bent substantially perpendicularly to the connecting wall 7 to provide an inner flange 6. The inner flange 6 has an outer peripheral portion formed at least in a substantially rectangular frame shape along the connecting wall 7. That is, the inner flange 6 has at least a predetermined width dimension continuously along the connecting wall 7 in the outer peripheral portion even if there is a portion that is continuously formed in the same plane as the inner region. It has a strip-shaped part.

  In the drawing, the first heat transfer plate 1 is formed such that the connecting wall 7 extends vertically downward with respect to the horizontal outer flange 5, and the inner flange 6 is formed horizontally at the lower end of the connecting wall 7. In this way, the inner flange 6 is disposed below the outer flange 5 and in parallel with the outer flange 5.

  Four nozzle flanges 8 (8A, 8B) and a heat exchange unit 9 are provided inside the inner flange 6. In the present embodiment, nozzle flanges 8 are provided at the four corners of the inner region of the substantially rectangular frame-shaped inner flange 6, and the other portions serve as the heat exchange unit 9. In FIG. 1, the first heat transfer plate 1 has an upper left and lower right nozzle flange 8A having the same configuration, and an upper right portion and lower left nozzle flange 8B having the same configuration. The upper left portion and the lower right portion of each of the heat transfer plates 1 and 2 may be referred to as a first corresponding position A, and the upper right portion and the lower left portion may be referred to as a second corresponding position B, respectively.

  The nozzle flange 8 is typically formed in a substantially circular shape, and a circular nozzle hole 10 is formed in the center. The first heat transfer plate 1 has a nozzle hole 10 penetratingly formed by press molding, and irregularities are bent at other locations, so that the outer flange 5, the connecting wall 7, the inner flange 6, the nozzle flange 8 and The heat exchange part 9 is integrally formed.

  In the first heat transfer plate 1, the nozzle flange 8 </ b> A is formed at the same height as the outer flange 5 at the first corresponding position A. That is, the first heat transfer plate 1 is formed such that the nozzle flange 8 </ b> A at the first corresponding position A protrudes upward from the inner flange 6 and is disposed in the same plane as the outer flange 5.

  In the first heat transfer plate 1, the nozzle flange 8 </ b> B is formed at the same height as the inner flange 6 in the second corresponding position B. That is, in the first heat transfer plate 1, the nozzle flange 8 </ b> B at the second corresponding position B is arranged in the same plane as the inner flange 6 and is formed continuously with the inner flange 6. The sizes of the nozzle flanges 8 and the nozzle holes 10 in the first corresponding position A and the second corresponding position B are formed to be the same.

  In the area inside the inner flange 6, appropriate irregularities are formed at locations excluding the nozzle flange 8 to form the heat exchange unit 9. The shape of the unevenness is not particularly limited, but in the illustrated example, it is the herringbone 11. Specifically, in the plan view of FIG. 1, irregularities are formed in a substantially inverted V shape at equal intervals, and each irregularity is substantially semicircular in cross section (perpendicular to the extending direction of each recess or each protrusion) When viewed in a cross section, the shape is substantially semicircular. Therefore, as shown in FIG. 2 and FIG. 3, the cross section of the heat exchanging portion 9 has a waveform. The lowermost portion of the downward concave portion of the herringbone 11 is disposed at the same height as the inner flange 6, and the uppermost portion of the upward convex portion is disposed at the same height as the outer flange 5.

  In addition, the short path | pass of the fluid between the nozzle holes 10 can be prevented by comprising so that the edge part of the herringbone 11 may contact the inner flange 6, and eliminating the flow path in the inner flange 6. FIG. That is, if a flow path with a small pressure loss is formed between the inner flange 6 and the end of the herringbone 11, a part of the fluid to be heat exchange may short-pass the outer periphery of the heat exchange unit 9. This is to prevent such inconvenience.

  Next, the second heat transfer plate 2 will be described. Similarly to the first heat transfer plate 1, the second heat transfer plate 2 also has an outer flange 12 provided along the outer peripheral portion, an inner flange 13 provided with a step inside the outer flange 12, both flanges 12, And a connecting wall 14 connecting the 13. The outer flange 12 and the inner flange 13 are flat and arranged in parallel, and a connecting wall 14 is provided preferably perpendicularly to the flanges 12 and 13.

  Since the second heat transfer plate 2 has a substantially rectangular shape, the outer flange 12 has a substantially rectangular frame shape. The outer flange 12 is formed with a predetermined width dimension (here, the same width dimension as the outer flange 5 of the first heat transfer plate 1) along the outer peripheral portion of the second heat transfer plate 2. A connecting wall 14 is provided at the inner peripheral edge of the outer flange 12 so as to be bent substantially perpendicular to the plate surface of the outer flange 12. The end of the connecting wall 14 extending from the outer flange 12 by a predetermined dimension (here, the same height as the connecting wall 7 of the first heat transfer plate 1) is bent substantially perpendicular to the connecting wall 14. An inner flange 13 is provided. The inner flange 13 has an outer peripheral portion formed at least in a substantially rectangular frame shape along the connecting wall 14. That is, the inner flange 13 is continuously formed along the connecting wall 14 on the outer peripheral portion at least a predetermined width dimension (here, even if there is a portion that is continuously formed in the same plane as the inner region. Then, it has the strip | belt-shaped part which ensured the same width dimension as the inner side flange 6 of the 1st heat exchanger plate 1. FIG.

  In the drawing, the second heat transfer plate 2 is formed such that the connecting wall 14 extends vertically upward with respect to the horizontal outer flange 12, and the inner flange 13 is formed horizontally at the upper end of the connecting wall 14. In this way, the inner flange 13 is disposed in parallel with the outer flange 12 above the outer flange 12.

  Four nozzle flanges 15 (15A, 15B) and a heat exchange unit 16 are provided inside the inner flange 13. In the present embodiment, nozzle flanges 15 are provided at the four corners of the inner region of the inner flange 13 having a substantially rectangular frame shape, and the other portions serve as the heat exchange section 16. In FIG. 1, the second heat transfer plate 2 has the same configuration of the nozzle flanges 15 </ b> A at the first corresponding position A at the upper left and the lower right, and the nozzles at the second corresponding position B at the upper right and the lower left. The flanges 15B have the same configuration. When the first heat transfer plate 1 and the second heat transfer plate 2 are aligned and overlapped, the nozzle flanges 8 and 15 and the nozzle holes 10 and 17 of the heat transfer plates 1 and 2 face each other. They are arranged and have the same size.

  The nozzle flange 15 is typically formed in a substantially circular shape, and a circular nozzle hole 17 is formed in the center. In the second heat transfer plate 2, the nozzle hole 17 is formed by press forming, and irregularities are bent at other locations, and the outer flange 12, the connecting wall 14, the inner flange 13, the nozzle flange 15, The heat exchange part 16 is integrally formed.

  In the second heat transfer plate 2, the nozzle flange 15 </ b> A is formed at the same height as the outer flange 12 in the first corresponding position A. That is, the second heat transfer plate 2 is formed such that the nozzle flange 15 </ b> A at the first corresponding position A protrudes downward from the inner flange 13 and is disposed in the same plane as the outer flange 12.

  In the second heat transfer plate 2, the nozzle flange 15 </ b> B is formed at the same height as the inner flange 13 in the second corresponding position B. That is, in the second heat transfer plate 2, the nozzle flange 15 </ b> B at the second corresponding position B is arranged in the same plane as the inner flange 13 and is formed continuously with the inner flange 13. The sizes of the nozzle flanges 15 and the nozzle holes 17 in the first corresponding position A and the second corresponding position B are formed to be the same.

  In the region inside the inner flange 13, appropriate irregularities are formed at locations excluding the nozzle flange 15 to form the heat exchange unit 16. The shape of the unevenness is not particularly limited, but in the illustrated example, it is a herringbone 18. Specifically, the projections and depressions are formed in a substantially V shape in the plan view of FIG. 1 at equal intervals, and each of the projections and depressions is substantially semicircular in cross section (perpendicular to the extending direction of each recess or each protrusion). When viewed in cross section, the shape is substantially semicircular. Therefore, as shown in FIGS. 2 and 3, the cross section of the heat exchanging portion 16 has a waveform. The lowermost portion of the downward concave portion of the herringbone 18 is disposed at the same height as the outer flange 12, and the uppermost portion of the upward convex portion is disposed at the same height as the inner flange 13.

  FIG. 4 is a schematic cross-sectional view when a plate heat exchanger is manufactured while the two heat transfer plates 1 and 2 are alternately overlapped and laser-welded, and shows a first corresponding position A in FIG. FIG. 5 is an enlarged view of the lower left part of FIG.

  As shown in the lower two heat transfer plates 1 and 2 in FIG. 4 and FIG. 5, in the illustrated example, first, the second heat transfer plate 2 is overlaid on the upper surface of the first heat transfer plate 1, and the required location is determined. Joined by laser welding from above. At this time, the two heat transfer plates 1 and 2 are overlapped with each other, that is, with their outer peripheral edges aligned. Thereby, both the heat-transfer plates 1 and 2 contact | abut the outer flanges 5 and 12 and the nozzle flanges 8A and 15A of the 1st corresponding position A also contact | abut. When the second heat transfer plate 2 is superimposed on the upper surface of the first heat transfer plate 1, the nozzle flanges 8B and 15B at the second corresponding position B are in the axial direction of the nozzle holes 10 and 17 (perpendicular to the plate surface). (Spaced in the direction) (FIG. 3). Moreover, both the heat-transfer plates 1 and 2 are arrange | positioned in the state which the herringbones 11 and 18 of the heat exchange parts 9 and 16 cross | intersected (FIG. 1).

  The two heat transfer plates 1 and 2 are continuously joined along the outer peripheral portion (that is, in an annular shape), and the outer flanges 5 and 12 are joined by lap welding joints by laser welding (welded portion 3). Compared with the case where the outer peripheral end surfaces of the overlapping portions of the outer flanges 5 and 12 are joined by the edge welded joint, in this embodiment, the joint is made by the lap welded joint. Can be welded. Further, not only feedback control but also manufacturing by teaching playback control (a method in which the position is not corrected from the initial teaching) is possible.

  The connecting wall 7 (14) connecting the outer flange 5 (12) and the inner flange 6 (13) is provided perpendicular to the flanges 5, 6 (12, 13), so that the heat transfer plate 1 ( 2) It is easy to ensure the strength in the stacking direction. Thereby, for example, even if the heat transfer plates 1 and 2 are welded in the stacking direction when the heat transfer plates 1 and 2 are welded, the heat transfer plates 1 and 2 are not easily bent, and thus are easily welded appropriately. In addition, the pressure resistance during use of the plate heat exchanger is improved.

  Although the welding position in the outer flanges 5 and 12 is not particularly limited, it is preferably made on the inner side of the outer side position by a set dimension from the inner peripheral edge of the outer flanges 5 and 12. In other words, the distance D2 from the inner peripheral edge of the outer flanges 5 and 12 to the end of the melted part 3 on the surface of the overlapping portion of the outer flanges 5 and 12 (surface on the laser beam irradiation side) is equal to or less than the set dimension. Is preferred. The set dimension is preferably less than or equal to one-half of the width dimension D1 of the outer flanges 5 and 12 (overlapping portion) (that is, D2 ≦ D1 / 2), and is preferably as small as possible (for example, one third of D1). Or less (ie, D2 ≦ D1 / 3). Therefore, the welding position may be the inner peripheral end portion of the overlapping portion of the outer flanges 5 and 12. Thereby, it can be set as the structure which can endure the load to the direction in which the heat-transfer plates 1 and 2 (outer flanges 5 and 12) which arise at the time of use of a plate type heat exchanger are separated. It should be noted that the outer flanges 5 and 12 may be welded at two or more locations inside and outside, in which case at least the inner welding is on the inner side of the outer peripheral position of the outer flanges 5 and 12 by a set dimension from the outer position. Made in

  Moreover, it is preferable to set the width dimension D1 of the outer flanges 5 and 12 so as to have a relationship of D1 ≦ 15t with respect to a plate thickness t described later. By reducing the protrusion width of the outer flanges 5 and 12 from the connecting walls 7 and 14, even if each heat transfer plate 1 and 2 becomes a large workpiece, the deflection and distortion of the outer flanges 5 and 12 can be minimized. Can be reduced at the same time. Then, by satisfying two conditions of D2 ≦ D1 / 2 (or D2 ≦ D1 / 3) and D1 ≦ 15t, the position of D2 is set at the inner peripheral end of the outer flanges 5 and 12 (overlapping portion). Since it can set to the vicinity, the effect | action of the internal pressure with respect to an overlapping part can be reduced.

  Further, in the state where the second heat transfer plate 2 is overlapped on the upper surface of the first heat transfer plate 1, both the heat transfer plates 1 and 2 are overlapped at the first corresponding position A with the nozzle flanges 8 </ b> A and 15 </ b> A. The nozzle flanges 8A and 15A are joined together by a lap weld joint by laser welding so as to surround the nozzle holes 10 and 17 of the nozzle flanges 8A and 15A (ie, in an annular shape) (welded portion 4). . At this time, the welding position in the nozzle flanges 8A and 15A is not particularly limited, and may be any of a setting region on the outer peripheral side, a setting region on the inner peripheral side, or an intermediate region thereof. In any case, the nozzle holes 10 and 17 are preferably welded concentrically. It should be noted that the nozzle flanges 8A and 15A may be welded at two or more locations inside and outside, and in that case, it is preferably welded concentrically.

  By the way, in this embodiment, when the outer flanges 5 and 12 are joined together by the lap weld joint, the laser beam is irradiated from the upper side to the lower side. The incident angle of the laser beam with respect to the heat transfer plates 1 and 2 arranged horizontally is preferably within a range of ± 30 ° with respect to the vertical direction (direction orthogonal to the plate surface). At this time, the laser beam may be tilted in any circumferential direction with respect to the vertical line. The reason for the range of ± 30 ° is that if the laser beam is tilted too much by 30 ° or more with respect to the vertical line, the heat from the laser beam will not easily enter the material.

  As will be described later, when the laser beam is focused on the surface of the overlapped portion of the outer flanges 5 and 12 (surface on the laser beam irradiation side), the laser beam is ± 30 ° with respect to the vertical line with the focus as a fixed point. The range may be tilted in any direction in the circumferential direction. For example, the incidence of the laser beam may be tilted in the range of ± 30 ° in the width direction of the outer flanges 5 and 12 with respect to the vertical line, or instead of or in addition to this, with respect to the traveling direction during welding The incidence of the laser beam may be tilted within a range of ± 30 °.

  Note that setting the incident angle of the laser beam in a range of preferably ± 30 ° with respect to the direction orthogonal to the plate surface is not limited to the welding of the outer flanges 5 and 12, but the first corresponding position A and the second corresponding position. The present invention can also be applied to other lap weld joint locations such as welding of the nozzle flanges 8 and 15 at the position B.

  When the outer flanges 5 and 12 are joined together by a lap weld joint, a laser beam is applied to the surface of the overlapping portion (the surface on the laser beam irradiation side, in the illustrated example, the upper surface of the outer flange 12 of the second heat transfer plate 2). It is preferable to perform laser welding with the focus of the laser beam. By performing laser welding while focusing on the surface of the overlapped portion, the beam width hardly changes in the thickness direction of the overlapped portion, and it is possible to join with a relatively thin and stable weld width. However, in some cases, the focal position may be shifted upward from the surface of the overlapping portion.

  When the outer flanges 5 and 12 are joined to each other by the lap weld joint, as shown in FIG. 5, in the cross-section in the width direction of the outer flanges 5 and 12, the joining surfaces of the outer flanges 5 and 12 (first heat transfer plate 1 The outer flange 5 upper surface of the second heat transfer plate 2 = the lower surface of the outer flange 12 of the second heat transfer plate 2 is d and the thickness of the outer flanges 5 and 12 is t. It is preferable to weld. In other words, for example, the spot diameter of the laser beam (beam diameter on the material surface) and / or irradiation energy (laser output and time ( If the laser is oscillating, adjust the pulse width and frequency)). In addition, in the case of through welding, after welding, the penetration width d0 on the surface of the overlapped portion and the penetration width (back wave width) d 'on the back surface can be easily measured. By (d0 + d ′) / 2, the penetration width d of the joint surface can be easily known.

The reason why the relationship of d ≧ 0.8t is ensured is as follows. As a premise, the relational expression of 0.8σ _a = τ _a is known for the pressure vessel material (Article 8 of Pressure Vessel Structure Standard (Ministry of Labor Notification No. 66 of 1989)). Here, σ _a is an allowable tensile stress and τ _a is an allowable shear stress. The plate heat exchanger is not a pressure vessel, and the relational expression is not related to welding, but it is safe if the plate heat exchanger can be configured as a pressure vessel that requires the highest strength. For example, when a plate heat exchanger is used as an evaporator, the refrigerant is vaporized / expanded between the heat transfer plates, so that an excellent strength is also desired for the welded portion. When the force generated between the heat transfer plates 1 and 2 is P, a tensile stress (σ = P / d) is generated in the penetration width d of the joint surface between the outer flanges 5 and 12. In the thickness direction, shear stress (τ = P / t) is generated. When these are applied to the relational expression (0.8σ _a = τ _a ), a relationship of 0.8 t = d is obtained. Therefore, in order to perform welding with a strength equal to or greater than the strength of the plate thickness t, d ≧ 0.8 t may be satisfied. For example, when the thickness of each of the heat transfer plates 1 and 2 is 0.3 mm, it is preferable that the penetration width d of the joint surface between the outer flanges 5 and 12 is 0.24 mm or more.

  For the same reason, in the cross section in the width direction of the outer flanges 5 and 12, when the width of the back wave generated on the back surface of the overlapping portion is d ′ and the plate thickness of the outer flange is t, d ′ ≧ 0. It is preferable that through welding is performed by laser welding so as to have a relationship of 8 t. That is, for example, the spot diameter of the laser beam and / or the irradiation energy is adjusted so that a relationship of d ′ ≧ 0.8t is obtained for the back wave after welding. As described above, in this embodiment, since the focal position of the laser beam is arranged and welded on the surface of the overlapping portion of the outer flanges 5 and 12 or above, the relationship of d ≧ d ′ is usually satisfied. There is also. This is because as the irradiation energy is consumed for melting the material, the melting amount gradually decreases from the front surface to the back surface of the overlapping portion.

  In the case of such a configuration, the width d ′ of the back wave of the welded portion 3 between the outer flanges 5 and 12 is confirmed, and whether or not there is a welding failure depending on whether or not d ′ ≧ 0.8 t is satisfied. Can be easily confirmed. That is, in the appearance inspection after welding, if d ′ ≧ 0.8 t, it can be determined as a non-defective product, and if d ′ <0.8 t, it can be determined as a defective product.

  It should be noted that joining with a lap weld joint so as to satisfy the relationship of d ≧ 0.8t, and preferably d ′ ≧ 0.8t, is limited to the welding of the outer flanges 5 and 12. However, the present invention can also be applied to other lap weld joints such as welding of the nozzle flanges 8 and 15 at the first corresponding position A and the second corresponding position B.

  After the second heat transfer plate 2 is overlapped and welded on the upper surface of the first heat transfer plate 1 as described above, the second heat transfer plate 2 and 1 shown in FIG. The first heat transfer plate 1 is superposed on the upper surface of the heat plate 2 and welded. At this time, the heat transfer plates 2 and 1 are overlapped with each other, that is, with their outer peripheral edges aligned. Thereby, both the heat transfer plates 2 and 1 are in contact with the inner flanges 13 and 6, and the nozzle flanges 15B and 8B at the second corresponding position B are also in contact with each other, as can be seen from FIG. When the first heat transfer plate 1 is superimposed on the upper surface of the second heat transfer plate 2, the nozzle flanges 15A and 8A at the first corresponding position A are in the axial direction of the nozzle holes 17 and 10 (perpendicular to the plate surface). (Spaced in the direction) (FIG. 4). Moreover, both the heat-transfer plates 2 and 1 are arrange | positioned in the state which the herringbones 18 and 11 of the heat exchange parts 16 and 9 cross | intersected.

  The two heat transfer plates 2 and 1 are continuously joined along the outer peripheral portion (that is, in an annular shape), and the inner flanges 13 and 6 are joined to each other by laser welding with a flare welded joint (welded portion 19). That is, the outer peripheral portion of the overlapping portion between the inner flanges 13 and 6 is laser welded. Further, the nozzle flanges 15B and 8B at the second corresponding position B are joined together by a lap weld joint as in the case of the nozzle flanges 15A and 8A at the first corresponding position A described above. When the inner flanges 13 and 6 are overlapped and the outer periphery is flare welded, the beam irradiation angle of the laser beam is preferably stopped within a range of ± 5 ° with respect to the direction parallel to the plate surface (horizontal). .

  Thereafter, in the same manner as described above, the second heat transfer plate 2 is overlapped and welded to the upper surface of the first heat transfer plate 1, and the first heat transfer plate 1 is attached to the upper surface of the second heat transfer plate 2. What is necessary is just to repeat superposition | welding and welding as many as desired.

  As described above, the first heat transfer plate 1 and the second heat transfer plate 2 are alternately overlapped, and a plate-type heat exchanger is configured while laser welding the required portion. In other words, the heat transfer plates 1 and 2 excluding the heat transfer plates at both ends in the stacking direction are overlapped with the adjacent one of the heat transfer plates and the outer flanges 5 and 12, and the overlapped portion is laser welded. On the other hand, the other adjacent heat transfer plate and the inner flanges 6 and 13 are overlapped, and the overlapped portion is laser welded. At that time, the nozzle flanges 8A and 15A overlapped at the first corresponding position A are laser welded, and the nozzle flanges 8B and 15B overlapped at the second corresponding position B are laser welded.

  In this way, the heat transfer plates 1 and 2 are overlapped with each other, and the heat transfer plates 1 and 2 are adjacent to each other as a fluid flow path, and the two fluids to be heat exchanged flow through the adjacent fluid flow paths. . Specifically, the first fluid is passed through the first flow path between the upper surface of the first heat transfer plate 1 and the lower surface of the second heat transfer plate 2, while the upper surface of the second heat transfer plate 2 The second fluid is passed through the second flow path between the lower surface of the heat transfer plate 1. At this time, it is preferable to pass the first fluid and the second fluid so that they are opposed to each other. Each nozzle hole 10, 17 functions as a fluid inlet / outlet port.

  By the way, although not shown, flat end plates are superimposed and welded to both ends of the heat transfer plates 1 and 2 in the stacking direction. On one end plate, through holes are formed at four corners corresponding to the nozzle holes 10 and 17, and an end of a tube (nipple) is fitted into the through hole. Four corners corresponding to the nozzle holes 10 and 17 are closed in the other end plate. When trying to exchange heat between two fluids, the first fluid is supplied from one of the two first corresponding positions A in the upper left and lower right with the pipe of one end plate serving as the inlet / outlet of the two fluids. The second fluid may be discharged from the other, supplied from one of the two second corresponding positions B at the upper right and the lower left, and discharged from the other. At this time, as described above, it is preferable to flow the first fluid and the second fluid so that they are opposed to each other. For example, when flowing the first fluid from the upper left part of the first flow path to the lower right part, it is preferable to flow the second fluid from the lower left part of the second flow path to the upper right part.

FIG. 6 is a view showing a modified example of the embodiment and corresponds to FIG.
In the said Example, although the 1st heat-transfer plate 1 was piled up on the upper surface of the 2nd heat-transfer plate 2, and the outer peripheral part of the overlap part of inner flanges 13 and 6 was joined by the flare welded joint, this modification Then, the first heat transfer plate 1 is overlapped on the upper surface of the second heat transfer plate 2, and the overlapping portion of the inner flanges 13, 6 is joined by a lap weld joint in the same manner as the outer flanges 5, 12. (Welded part 19 '). Since other configurations are the same as those in the above-described embodiment, description thereof is omitted.

  By the way, in the first corresponding position A and the second corresponding position B, the overlapping portions of the nozzle flanges 8 and 15 are arranged apart from each other in the axial direction of the nozzle holes 10 and 17. For example, as shown in FIG. 4, in the first corresponding position A, the upper surface of the nozzle flange 8A of the first heat transfer plate 1 and the lower surface of the nozzle flange 15A of the second heat transfer plate 2 are overlapped. The upper surface of the nozzle flange 15A of the second heat transfer plate 2 and the lower surface of the nozzle flange 8A of the first heat transfer plate 1 disposed thereabove are spaced apart. 3, at the second corresponding position B, the upper surface of the nozzle flange 8B of the first heat transfer plate 1 and the lower surface of the nozzle flange 15B of the second heat transfer plate 2 are spaced apart. However, the upper surface of the nozzle flange 15B of the second heat transfer plate 2 and the lower surface of the nozzle flange 8B of the first heat transfer plate 1 disposed thereabove are overlapped.

  As described above, in both the first corresponding position A and the second corresponding position B, the overlapping portions of the nozzle flanges 8 and 15 are arranged apart from each other in the axial direction of the nozzle holes 10 and 17. , 15 is provided with a gap between them. Therefore, when the nozzle flanges 8 and 15 are overlapped and welded, if the heat transfer plates 1 and 2 (particularly the nozzle flanges 8 and 15) are pressed in the stacking direction with a jig, the heat transfer plates 1 and 2 ( In particular, the nozzle flanges 8 and 15) are bent, the target position of the laser beam may be shifted, and there is a possibility that proper welding cannot be performed. Therefore, in the gap between the nozzle flanges 8 and 15 that are arranged apart from each other in the axial direction of the nozzle holes 10 and 17, the fluid flow path between the heat transfer plates 1 and 2 that form the gap and the nozzles separated from each other. Whether the protrusions 20 that contact each other from the nozzle flanges 8 and 15 are formed while securing the communication with the nozzle holes 10 and 17 of the flanges 8 and 15 (FIGS. 7 and 8). It is preferable to provide a spacer 21 that abuts against (FIGS. 9 and 10). Both the protrusion 20 and the spacer 21 are formed with rigidity. Hereinafter, although a specific example is demonstrated, it cannot be overemphasized that the magnitude | size and shape of the protrusion 20 and the spacer 21 can be changed suitably, as long as the same function is exhibited.

  FIG. 7 is a schematic view showing an example of the heat transfer plates 1 and 2 in which the protrusions 20 are provided on the nozzle flanges 8 and 15, and only a part of the heat transfer plates 1 and 2 is shown. In FIG. 7, a portion corresponding to the first corresponding position A of the second heat transfer plate 2 of FIG. 2 is shown, but the configurations of the other nozzle flanges 8 and 15 are the same. FIG. 8 is a schematic cross-sectional view (cross-sectional view taken along the line VIII-VIII in FIG. 7) showing such a stacked state of the heat transfer plates 1 and 2, and corresponds to FIG.

  When the heat transfer plates 1 and 2 are overlaid, the nozzle flanges 8 and 15 that are arranged facing each other with a gap perpendicular to the plate surface are provided with protrusions 20 at positions corresponding to each other. The projections 20 are butted and the heat transfer plates 1 and 2 are overlapped. At this time, when the outer flanges 5 and 12 are overlapped with each other, the height of each protrusion 20 is set so that the protrusions 20 just contact each other. Further, the presence of the protrusion 20 also causes a fluid flow path between the heat transfer plates 1 and 2 (a gap between the heat exchange portions 9 and 16) and the nozzle holes 10 and 15 of the nozzle flanges 8 and 15 with the protrusion 20. Communication with 17 is ensured.

  In the present embodiment, a plurality of protrusions 20 are provided at equal intervals in the circumferential direction at positions that surround the nozzle holes 10 and 17 and at positions corresponding to both facing nozzle flanges 8 and 15. The shape of each protrusion 20 is not particularly limited, but is preferably press-molded so as to swell from the nozzle flanges 8 and 15 into a substantially hemispherical shape.

  Specifically, as shown in the two central heat transfer plates 2 and 1 of FIG. 8, at the first corresponding position A, the nozzle flange 15A of the second heat transfer plate 2 bulges upward and protrudes. On the other hand, the nozzle flange 8 </ b> A of the first heat transfer plate 1 bulges downward to form a protrusion 20. The height of each protrusion 20 corresponds to the height of the inner flanges 13 and 6. That is, in the second heat transfer plate 2, the upper end of the protrusion 20 upward from the nozzle flange 15 </ b> A is disposed at the same height as the inner flange 13, and in the first heat transfer plate 1, the upper end of the protrusion 20 is The lower end portion of the protruding portion 20 is disposed at the same height as the inner flange 6. Therefore, when the heat transfer plates 2 and 1 are overlapped, the upper end of the upward protrusion 20 provided on the nozzle flange 15A of the second heat transfer plate 2 and the nozzle flange 8A of the first heat transfer plate 1 are overlapped. Is in contact with the lower end of the downward projecting portion 20 (ideally a point contact in the illustrated example).

  Similarly, at the second corresponding position B, the nozzle flange 8B of the first heat transfer plate 1 bulges upward to form a protrusion 20 while the nozzle flange 15B of the second heat transfer plate 2 is formed. Is formed with a protrusion 20 that bulges downward. When the heat transfer plates 1 and 2 are overlapped, the upper end of the upward protrusion 20 provided on the nozzle flange 8B of the first heat transfer plate 1 and the nozzle flange 15B of the second heat transfer plate 2 are overlapped. The lower end portion of the downward projecting portion 20 provided on the abutting portion is brought into contact.

  In this way, the nozzle flanges 8 and 15 that are spaced apart from each other in the axial direction of the nozzle holes 10 and 17 are brought into contact with the nozzle flanges 8 and 15 by the contact of the protrusions 20 from the nozzle flanges 8 and 15. Stiffness can be maintained to ensure that it is level. At this time, the rigidity of the nozzle flanges 8 and 15 is determined not only by butting the protrusions 20 from the nozzle flanges 8 and 15 facing away from each other, but also by forming the protrusions 20 on the nozzle flanges 8 and 15 itself. Is also granted. Thus, for example, even when the heat transfer plates 1 and 2 are welded together, even if they are pressed with a jig in the stacking direction, the heat transfer plates 1 and 2 (particularly the nozzle flanges 8 and 15) are not easily bent, and laser welding can be easily and reliably performed. Can be done. When the heat transfer plates 1 and 2 are pressed against each other in the stacking direction, it is preferable to press a portion having high rigidity (that is, a portion where the protrusion 20 is formed).

  FIG. 9 is a schematic perspective view showing an example of the spacer 21 provided in the gap between the nozzle flanges 8 and 15. FIG. 10 is a schematic cross-sectional view showing a stacked state of the heat transfer plates 1 and 2 through the spacer 21 and corresponds to FIG. 10 shows the first corresponding position A, the spacer 21 can be interposed between the nozzle flanges 8 and 15 arranged facing each other at the second corresponding position B as well.

  The spacer 21 of the present embodiment is formed from an annular member formed in a waveform (triangular wave shape in the illustrated example) in the circumferential direction. Specifically, an annular metal plate is bent in an uneven shape in the circumferential direction. The spacer 21 has an outer diameter larger than that of the nozzle holes 10 and 17 and smaller than the nozzle flanges 8 and 15, while an inner diameter thereof is larger than that of the nozzle holes 10 and 17. Further, the wave height (thickness) of the spacer 21 corresponds to the distance between the nozzle flanges 8 and 15.

  When a plate-type heat exchanger is constructed while superimposing the heat transfer plates 1 and 2 and welding the required portions, there is a portion where a gap is generated between the nozzle flanges 8 and 15 as described above. , 15 is arranged in the gap between the spacers 21. At that time, a substantially annular spacer 21 is arranged to be fitted into the substantially circular nozzle flanges 8 and 15. Preferably, the nozzle flanges 8 and 15 and the spacer 21 are arranged concentrically. When the heat transfer plates 1 and 2 are overlapped, the spacer 21 is disposed such that the lower end abuts against the lower nozzle flange 15 (8) while the upper end abuts against the upper nozzle flange 8 (15). The

  In this way, the nozzle flanges 8 and 15 that are spaced apart from each other in the axial direction of the nozzle holes 10 and 17 are given rigidity by the spacer 21 and are kept horizontal. Thus, for example, even when the heat transfer plates 1 and 2 are welded together, even if they are pressed with a jig in the stacking direction, the heat transfer plates 1 and 2 (particularly the nozzle flanges 8 and 15) are not easily bent, and laser welding can be easily and reliably performed. Can be done. When pressing the heat transfer plates 1 and 2 with a jig in the stacking direction, it is preferable to press a portion having high rigidity (that is, a portion where the spacer 21 is disposed).

  In addition, when welding the nozzle flanges 8 and 15, the spacer 21 may be welded together. For example, in FIG. 10, after the spacer 21 is disposed between the second heat transfer plate 2 and the first heat transfer plate 1 and the inner flanges 13 and 6 are welded together, the second heat transfer plate is disposed above the spacer 21. 2 are overlapped and the nozzle flanges 8 and 15 are welded to each other. At this time, the spacer 21 disposed below the overlapping portion of the nozzle flanges 8 and 15 may be welded at the same time. Thereby, the positioning of the spacer 21 between the heat transfer plates 1 and 2 can be easily achieved. In addition, the nozzle flanges 8 and 15 may be formed with a concave portion or a convex portion for positioning the spacer 21.

  FIG. 11 is a schematic perspective view showing a modified example of the spacer 21 provided in the gap between the nozzle flanges 8 and 15.

  Spacer 21 'of this modification is formed from an annular member in which notches 22 are formed along the radial direction at a plurality of locations in the circumferential direction. Specifically, an annular metal plate is bent into a mountain shape in cross section, and notches 22 are formed along the radial direction at equal intervals in the circumferential direction. In the illustrated example, each notch 22 opens downward and is formed in a substantially rectangular shape. The spacer 21 ′ has an outer diameter larger than the nozzle holes 10 and 17 and a smaller diameter than the nozzle flanges 8 and 15, while an inner diameter is larger than the nozzle holes 10 and 17. . Further, the height (thickness) of the spacer 21 ′ corresponds to the distance between the nozzle flanges 8 and 15. Other configurations and attachment methods are the same as in the case of the spacer 21 in FIGS.

  The plate heat exchanger of the present invention is not limited to the configuration of the above-described embodiment, and can be changed as appropriate. In particular, if the following configuration is provided, other configurations can be appropriately changed. That is, a plurality of heat transfer plates 1 and 2 are overlapped, a plate-type heat assembled so that two fluids to be heat-exchanged flow in the adjacent fluid flow paths with the fluid flow path between the adjacent heat transfer plates 1 and 2. In each of the heat transfer plates 1 and 2, nozzle flanges 8 and 15 having nozzle holes 10 and 17 serving as fluid inlets and outlets to the fluid flow path are provided at four or more locations. And each heat-transfer plate 1 and 2 piled up is the heat transfer plate of the both ends of a lamination direction except one heat transfer plate which adjoins, and two or more 1st corresponding | compatible positions A of the said four or more places. The nozzle flanges 8 and 15 are overlapped with each other while the other adjacent heat transfer plate and the nozzle flanges at two or more second corresponding positions B excluding the first corresponding position A of the four or more positions. 8, 15 are overlapped. The gaps between the nozzle flanges 8 and 15 that are spaced apart in the axial direction of the nozzle holes 10 and 17 include the fluid flow paths between the heat transfer plates 1 and 2 that form the gaps, and the separated nozzles. Spacers 21 (21 ') that contact both nozzle flanges 8 and 15 are provided while ensuring communication with the nozzle holes 10 and 17 of the flanges 8 and 15, or protrusions that contact each other from both nozzle flanges 8 and 15 If 20 is formed, other configurations can be changed as appropriate.

  For example, in the above embodiment, the outer flanges 5 and 12 are joined by a lap weld joint, while the inner flanges 6 and 13 are joined by a flare weld joint or a lap weld joint. The joining method between the inner flanges 6 and 13 can be appropriately changed.

  Further, the size and shape of the heat transfer plates 1 and 2 and the configuration of the heat exchange units 9 and 16 can be changed as appropriate. Further, the positions of the nozzle flanges 8 and 15 (nozzle holes 10 and 17) are not limited to the four corners of the heat transfer plates 1 and 2, and are set as appropriate. Furthermore, the number of nozzle flanges 8 and 15 (nozzle holes 10 and 17) may be at least four. By increasing the number of nozzle flanges 8 and 15 (nozzle holes 10 and 17), not only two-fluid heat exchange but also three-fluid heat exchange can be performed, or a plurality of inlets and outlets can be provided for one fluid.

  In the embodiment, the first corresponding position A and the second corresponding position B may be interchanged. That is, for each heat transfer plate 1 and 2 in FIG. 1, the configuration of the upper left and lower right nozzle flanges 8A and 15A and the configuration of the upper right and lower left nozzle flanges 8B and 15B may be interchanged.

  Moreover, in the said Example, if each heat-transfer plate 1 and 2 can join the outer flanges 5 and 12 with a lap welded joint, it will be the magnitude | size (in other words, heat-transfer plates 1 and 2). ) Are not necessarily the same. The same applies to the case where the inner flanges 6 and 13 are joined together by a lap weld joint. Similarly, the sizes of the nozzle flanges 8 and 15 may be changed according to circumstances.

  Moreover, in the said Example, although the inlet_port | entrance and outlet of each fluid were arrange | positioned on the diagonal of the substantially rectangular heat-transfer plates 1 and 2, it is not restricted to this, For example, the substantially rectangular heat-transfer plates 1 and 1 are arranged. You may arrange | position in the position along 2 long sides. That is, the first corresponding position A and the second corresponding position B are arranged on the diagonal lines of the heat transfer plates 1 and 2, respectively. The second corresponding positions B may be arranged at both ends of the other side. And in the said Example, although comprised using two types of heat-transfer plates of the 1st heat-transfer plate 1 and the 2nd heat-transfer plate 2 alternately, depending on the case, using one type of heat-transfer plate, You may assemble by superimposing while reversing 180 degrees.

  Moreover, in the said Example, although the connection wall 7 (14) which connects the outer side flange 5 (12) and the inner side flange 6 (13) was provided perpendicular | vertical with respect to each flange 5, 6 (12, 13), If necessary, it may be provided with a slight inclination.

  Furthermore, in the said Example, although the location of the lap weld joint performed the penetration welding by laser welding, you may perform various seam weldings, such as non-through-welding.

DESCRIPTION OF SYMBOLS 1 1st heat-transfer plate 2 2nd heat-transfer plate 3 Welded part (outside flange) 4 Welded part (of nozzle flange) 5 Outer flange (of 1st heat-transfer plate) 6 Inner flange (of 1st heat-transfer plate) 7 Connection wall (of the first heat transfer plate) 8 Nozzle flange (of the first heat transfer plate) 9 Heat exchange part (of the first heat transfer plate) 10 Nozzle hole (of the first heat transfer plate) 11 (First transfer of heat) Herringbone (of the heat plate) 12 Outer flange (of the second heat transfer plate) 13 Inner flange (of the second heat transfer plate) 14 Connecting wall (of the second heat transfer plate) 15 Nozzle flange (of the second heat transfer plate) 16 Heat exchange part (of the second heat transfer plate) 17 Nozzle hole (of the second heat transfer plate) 18 Herringbone 19, 19 '(of the second heat transfer plate) Welded part (of the inner flange) 20 Projection part 21, 2 'First position corresponding spacer 22 notch A B second corresponding position

Claims (4)

A plate-type heat exchanger in which a plurality of heat transfer plates are stacked, a fluid flow path is formed between adjacent heat transfer plates, and the two fluids to be heat exchanged flow through the adjacent fluid flow paths,
Each of the heat transfer plates is provided with four or more nozzle flanges formed with nozzle holes as fluid inlets and outlets to the fluid flow path,
The superposed heat transfer plates, except for heat transfer plates at both ends in the stacking direction, are adjacent to one heat transfer plate and the nozzle flanges at two or more first corresponding positions of the four or more locations. Are overlapped with each other, and the nozzle flanges are overlapped at two or more second corresponding positions excluding the first corresponding position out of the four or more adjacent heat transfer plates,
In the gap between the nozzle flanges spaced apart in the axial direction of the nozzle hole, communication between the fluid flow path between the heat transfer plates forming the gap and the nozzle hole of each separated nozzle flange A spacer that contacts both nozzle flanges is provided, or protrusions that contact each other from both nozzle flanges are formed ,
Each of the heat transfer plates includes an outer flange provided along the outer peripheral portion, and an inner flange provided with a step inside the outer flange.
Each of the heat transfer plates is provided with a substantially circular nozzle flange on the inner side of the inner flange, and the circular nozzle hole as a fluid inlet / outlet port to the fluid flow path is provided in the nozzle flange. Formed,
In the first corresponding position, the nozzle flange is formed at the same height as the outer flange, while in the second corresponding position, the nozzle flange is formed at the same height as the inner flange,
Each of the heat transfer plates is adjacent to one of the adjacent heat transfer plates, and the outer flanges are overlapped with each other, and the nozzle flanges of the first corresponding position are overlapped with each other, and the other adjacent heat transfer plate, The inner flanges are overlaid and the nozzle flanges at the second corresponding positions are overlaid,
In the gap between the nozzle flanges spaced apart in the axial direction of the nozzle hole, communication between the fluid flow path between the heat transfer plates forming the gap and the nozzle hole of each separated nozzle flange An annular spacer that contacts both nozzle flanges is provided, or the protrusions that contact each other from both nozzle flanges are formed at a plurality of locations in the circumferential direction of the nozzle hole. Heat exchanger. The spacer is formed of a ring-shaped member formed in a corrugated shape in the circumferential direction, the outer diameter is larger than the nozzle hole, and the wave height corresponds to the separation dimension between the nozzle flanges. The plate heat exchanger according to claim 1 , wherein The spacer is formed from an annular member having notches formed along a radial direction at a plurality of locations in the circumferential direction, the outer diameter is larger than the nozzle hole, and the thickness is between the nozzle flanges. The plate heat exchanger according to claim 1 , wherein the plate type heat exchanger corresponds to a separation dimension. The protrusion is press-molded so as to swell from the nozzle flange into a substantially hemispherical shape,
2. The plate heat exchanger according to claim 1 , wherein the protrusions are provided at equal intervals in a circumferential direction at a position surrounding the nozzle hole and at a position corresponding to both nozzle flanges facing each other.

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