JPWO2014155838A1 - Plate heat exchanger - Google Patents

Abstract

The first channel and the second channel are alternately formed with the heat transfer plate as a boundary, and the first channel of one of the pair of first channels through which the first fluid flows in and out by communicating with the first channel. A flow path for the first fluid is formed from the series passage to the other first series passage of the pair of first series passages for allowing the first fluid to flow in and out. It is a reference flow path that is a starting point of the path, one first series passage communicates only with the reference flow path, and the other first series passage is a plurality of first flow paths larger than the number of reference flow paths, It communicates only with a plurality of first flow paths that are the end of the flow path of the first fluid.

Description

Cross-reference of related applications

  This application claims the priority of Japanese Patent Application No. 2013-74894, and the content of Japanese Patent Application No. 2013-74894 is incorporated in the description of the present specification by reference.

  The present invention relates to a plate heat exchanger used as an evaporator and a condenser.

  Conventionally, a plate heat exchanger has an evaporator that evaporates the first fluid in association with heat exchange between the first fluid and the second fluid, and a first in association with heat exchange between the first fluid and the second fluid. It is widely used as a heat exchanger used in a condenser that condenses fluid (for example, see Patent Document 1).

  In general, the plate heat exchanger includes a main body 3 including a plurality of heat transfer plates 2, as shown in FIG. The main body 3 includes a first flow path 30, a second flow path 31, a pair of first series passages 32 and 33, and a pair of second communication paths 34 and 35. The first flow path 30 allows the first fluid A to flow. The second flow path 31 circulates the second fluid B. The pair of first series passages 32 and 33 communicate with the first flow path 30 and allow the first fluid A to flow into and out of the first flow path 30. The pair of second communication passages 34 and 35 communicate with the second flow path 31 and allow the second fluid B to flow into and out of the second flow path 31.

  This will be described more specifically. The plurality of heat transfer plates 2, ... each have at least four openings (not numbered). And in the main-body part 3, several heat-transfer plate 2, ... is laminated | stacked. Thereby, the 1st flow path 30 which distribute | circulates the 1st fluid A and the 2nd flow path 31 which distribute | circulates the 2nd fluid B are alternately formed by using the heat-transfer plates 2 ... as a boundary. Further, by stacking the plurality of heat transfer plates 2,..., The openings formed in the heat transfer plate 2 are continuous in the stacking direction of the plurality of heat transfer plates 2. Accordingly, one first series passage 32 that allows the first fluid A to flow into the first flow path 30, the other second series path 33 that causes the first fluid A to flow out from the first flow path 30, and the second flow path 31. One second communication passage 34 for allowing the second fluid B to flow into the second fluid passage B and the other second communication passage 35 for allowing the second fluid B to flow out from the second flow passage 31 pass through the heat transfer plates 2,. It extends in the stacking direction of the plurality of heat transfer plates 2 (see, for example, Patent Document 1).

  In this type of plate heat exchanger 1, the first fluid A supplied to one of the first series passages 32 flows out through the first flow path 30 to the other first series passage 33. Further, the second fluid B supplied to one second communication passage 34 flows out to the other second communication passage 35 through the second flow path 31. In the plate heat exchanger 1, the first fluid A flows through the first flow path 30 and the second fluid B flows through the second flow path 31 as described above. As a result, the plate heat exchanger 1 exchanges heat between the first fluid A and the second fluid B via the wide heat transfer surface of the heat transfer plate 2 that partitions the first flow path 30 and the second flow path 31. Let

  By the way, in this kind of plate-type heat exchanger 1, when the number of laminated heat transfer plates 2,... Increases, the heat transfer area contributing to heat exchange increases and the heat exchange performance increases.

  However, when the number of heat transfer plates 2,... Increases, the length of the first series passages 32, 33 and the second communication passages 34, 35 extending in the stacking direction of the heat transfer plates 2,. It becomes longer according to the number of plates 2.

  That is, each of the pair of first series passages 32, 33 and the pair of second communication paths 34, 35 is formed by the openings of the heat transfer plates 2,. The flow path lengths of the 33 and the pair of second communication passages 34 and 35 become longer as the number of the heat transfer plates 2.

  As a result, the flow resistance of the first fluid A in the first series passage (one first series passage) 32 through which the first fluid A flows into the first flow path 30 increases, and the first fluid A becomes difficult to flow. . Therefore, in this type of plate heat exchanger 1, the inflow amount of the first fluid A to the first flow path 30 on the inlet side of one first series passage 32 and the back side of one first series path 32. The amount of the first fluid A flowing into the first flow path 30 is not uniform. That is, in this type of plate heat exchanger 1, uneven distribution of the first fluid A occurs with respect to the plurality of first flow paths 30 arranged in the stacking direction of the heat transfer plates 2. As a result, in this type of plate heat exchanger 1, the heat exchange performance (evaporation performance) is improved even if the number of the heat transfer plates 2,. There is a limit.

Japanese Unexamined Patent Publication No. 11-287572

  Accordingly, the present invention provides a plate heat exchanger that can uniformly supply the first fluid to the plurality of first flow paths while suppressing an increase in pressure loss in the plurality of first flow paths through which the first fluid flows. The issue is to provide.

  The plate heat exchanger according to the present invention includes a main body portion including a plurality of stacked heat transfer plates, and the main body portion includes a plurality of first flow paths through which the first fluid flows and a plurality of the second fluid through which the second fluid flows. And a pair of first passages communicating with the first passage, a pair of first passages allowing the first fluid to flow into and out of the first passage, and a pair communicating with the second passage. And a pair of second communication passages for allowing the second fluid to flow into and out of the second flow path, and the first flow path and the second flow path are alternately arranged with the heat transfer plate as a boundary. In the plate heat exchanger in which each of the first series passage and the second communication passage extends through the heat transfer plate in the stacking direction of the heat transfer plates, the first flow paths communicate with each other. Forming a flow path of the first fluid from one of the first series passages to the other of the first series passages; At least one first flow path is a reference flow path that is a starting point of the flow path of the first fluid, one first series passage communicates only with the reference flow path, and the other first series passage is a reference flow path. It is a plurality of first flow paths larger than the number of flow paths, and is communicated only with a plurality of first flow paths that are terminal ends of the flow path of the first fluid.

  As one aspect of the present invention, at least one first flow path located in the middle of the heat transfer plate in the stacking direction is a reference flow path that is a starting point of the flow path of the first fluid, The heat transfer plate has at least a pair of primary branch passages that communicate with at least one first flow path on each of the one end side and the other end side from the reference flow path in the stacking direction, and the other first series path is: A plurality of first flow paths that are the end of the flow path of the first fluid on each of the one end side and the other end side of the reference flow path in the stacking direction of the heat transfer plates, and a plurality of first flow paths larger than the number of reference flow paths You may connect only to a 1st flow path.

  In this case, a plurality of first flow paths are provided on each of one end side and the other end side of the reference flow path in the stacking direction of the heat transfer plates, and one end side and the other end of the reference flow path in the stacking direction of the heat transfer plates. In each of the sides, the first flow path in the middle of the stacking direction of the heat transfer plates among the plurality of first flow paths is an intermediate reference flow path that becomes a branch position of the flow path of the first fluid, A pair of secondary branch passages that connect the intermediate reference flow path and at least one first flow path on each of the one end side and the other end side of the intermediate reference flow path in the stacking direction of the heat transfer plates; Each of the primary branch paths may be in communication with an intermediate reference channel on each of the one end side and the other end side of the reference channel in the stacking direction of the heat transfer plates.

  As a specific aspect, the first flow path has one end side and an intermediate reference flow path in the stacking direction of the heat transfer plates on each of the one end side and the other end side of the reference flow path in the stacking direction of the heat transfer plates. A plurality of secondary branch paths are provided on each of the other end sides, and each of the pair of secondary branch paths communicates with one first flow path on each of the one end side and the other end side of the intermediate reference flow path in the stacking direction of the heat transfer plates. The main body portion includes the first flow paths on one end side with respect to the intermediate reference flow path in the stacking direction of the heat transfer plates on each of the one end side and the other end side with respect to the reference flow path in the stacking direction of the heat transfer plates. At least one connection path for connecting, and at least one connection path for connecting the first flow paths on the other end side with respect to the intermediate reference flow path in the stacking direction of the heat transfer plates, and the other first series path A plurality of first flow paths communicating via a single connection path on each of the one end side and the other end side with respect to the intermediate reference flow path in the stacking direction of the heat transfer plates, and more than the number of reference flow paths You may communicate only with several 1st flow paths.

  In this case, the main body portion includes, as the connection path, a first connection path that connects the first flow path that communicates with the secondary branch path and another first flow path, and a plurality of first flow paths that include the other first flow path. The first connection path and the second connection path are arranged at intervals in a direction orthogonal to the stacking direction of the heat transfer plates, and the other first series path is You may communicate with 1st flow paths other than said another 1st flow path among several 1st flow paths connected to the 2nd connection path.

  Further, as a specific other aspect, the first flow path has one end than the intermediate reference flow path in the stacking direction of the heat transfer plates on each of the one end side and the other end side of the reference flow path in the stacking direction of the heat transfer plates. A plurality of first flow paths are provided on each of one side and the other side of the intermediate reference flow path in the stacking direction of the heat transfer plates. The main body portion is one of the secondary ends at one end side of the intermediate reference flow path in the stacking direction of the heat transfer plates on each of the one end side and the other end side of the reference flow path in the stacking direction of the heat transfer plates. An intermediate reference in the stacking direction of the heat transfer plate, a first flow path communicating with the branch path, a connection path connecting a plurality of other first flow paths larger than the number of first series paths communicating with the secondary branch path The other end than the flow path A first flow path communicating with the other secondary branch path, and a connection path connecting a plurality of other first flow paths larger than the number of first series paths communicating with the secondary branch path, The first series passages may communicate only with the plurality of other first flow paths on the one end side and the other end side of the intermediate reference flow path in the stacking direction of the heat transfer plates.

FIG. 1 is a schematic overall perspective view of a plate heat exchanger according to an embodiment of the present invention. FIG. 2 is a schematic exploded perspective view of the plate heat exchanger according to the embodiment. FIG. 3 is a schematic diagram for explaining the flow path of the first fluid and the flow path of the second fluid of the plate heat exchanger according to the embodiment. FIG. 4 is a schematic diagram for explaining the flow path of the first fluid and the flow path of the second fluid of the plate heat exchanger according to another embodiment of the present invention. FIG. 5 is a schematic diagram for explaining the flow path of the first fluid and the flow path of the second fluid of the conventional plate heat exchanger.

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

  As shown in FIG. 1, the plate heat exchanger includes a main body 3 including a plurality of stacked heat transfer plates 2.

  As shown in FIGS. 2 and 3, the main body 3 includes a first flow path 30, a second flow path 31, a pair of first series passages 32 and 33, and a pair of second communication paths 34 and 35. . The first flow path 30 allows the first fluid A to flow. The second flow path 31 circulates the second fluid B. The pair of first series passages 32 and 33 communicate with the first flow path 30 and allow the first fluid A to flow into and out of the first flow path 30. The pair of second communication passages 34 and 35 communicate with the second flow path 31 and allow the second fluid B to flow into and out of the second flow path 31. In the following description, one of the pair of first series passages 32 and 33 is referred to as a “first inflow communication path”. The other first series passage 33 of the pair of first series passages 32 and 33 is referred to as a “first outflow communication path”. One of the pair of second communication passages 34 and 35 is referred to as a “second inflow communication passage”. The other second communication path 35 of the pair of second communication paths 34 and 35 is referred to as a “second outflow communication path”.

  The first flow path 30 and the second flow path 31 are alternately formed with the heat transfer plates 2,. On the other hand, each of the first inflow communication path 32, the first outflow communication path 33, the second inflow communication path 34, and the second outflow communication path 35 passes through the heat transfer plates 2,. The plate 2 extends in the stacking direction (hereinafter referred to as the first direction).

  This will be described more specifically. The plate type exchanger 1 according to this embodiment includes a main body 3 including a plurality of stacked heat transfer plates 2, and a pair of end plates 4 and 5 sandwiching the main body 3.

  Each of the plurality of heat transfer plates 2, ... is formed by press-molding a metal plate. As shown in FIG. 2, each of the heat transfer plates 2,... Has a heat transfer section 20 that defines the first flow path 30 and the second flow path 31, and the heat transfer section 20 extends in a direction that intersects the heat transfer section 20. And an annular fitting portion 21 extending from the outer periphery.

  A plurality of recesses and protrusions (not shown) are alternately formed on the front and back of the heat transfer section 20 of each heat transfer plate 2. And in the heat-transfer part 20 of each heat-transfer plate 2, ..., the 1st inflow communication path 32, the 1st outflow communication path 33, the 2nd inflow communication path 34, and the 2nd outflow communication path 35 are formed. An opening (not numbered) is formed. That is, openings are provided in at least four places of the heat transfer section 20 of the heat transfer plates 2. This opening is for forming a flow path extending in the first direction and penetrates the heat transfer section 20.

  The plate heat exchanger 1 according to this embodiment includes a plurality of types of heat transfer plates 2. The plate heat exchanger 1 according to the present embodiment forms the first inflow communication passage 32, the first outflow communication passage 33, the second inflow communication passage 34, and the second outflow communication passage 35 as described above. In addition to the heat transfer plates 2 formed with openings, the heat transfer plates 2 formed with openings for forming primary branch paths 36a and 36a or secondary branch paths 36b and 36b described later are provided. In the present embodiment, the first inflow communication path 32, the first outflow communication path 33, the second inflow communication path 34, the second outflow communication path 35, the primary branch paths 36a and 36a, and the secondary branch paths 36b and 36b. The flow paths such as are described in detail. Further, the number, arrangement, and size of the openings for forming these are the same as the general plate heat exchanger, the purpose of use of the plate heat exchanger 1, the first fluid A, and the second fluid B. It is appropriately selected depending on the type and flow rate.

  Each of the pair of end plates 4 and 5 is formed by press-molding a metal plate, and is formed in substantially the same shape as the heat transfer plates 2. Specifically, the end plates 4 and 5 include sealing portions 40 and 50 and annular fitting portions 41 and 51. The sealing parts 40 and 50 are formed in substantially the same shape as the heat transfer part 20. The annular fitting portions 41 and 51 extend from the entire outer periphery of the sealing portions 40 and 50 in a direction crossing the sealing portions 40 and 50.

  One end plate (hereinafter referred to as a first end plate) 4 is an opening formed in adjacent heat transfer plates 2,..., And includes a first inflow communication path 32, a first outflow communication path 33, and a second inflow. An opening (not numbered) corresponding to the opening for forming the communication path 34 and the second outflow communication path 35 is provided. That is, the openings are provided at four locations on the sealing portion 40 of the first end plate 4. Accordingly, cylindrical nozzles (not numbered) for connecting pipes are connected to the outer surface of the sealing portion 40 of the first end plate 4 in an arrangement corresponding to each opening.

  On the other hand, the opening part is not provided in the sealing part 50 of the other end plate (hereinafter referred to as the second end plate) 5. That is, the second end plate 5 includes a sealing portion 50 that can seal a flow path formed by the openings of the heat transfer plates 2.

  The plurality of heat transfer plates 2,. In this state, the protrusions of the heat transfer portions 20 of the adjacent heat transfer plates 2,... Intersect each other, and the fitting portions 21 of the adjacent heat transfer plates 2,. Along with this, the close contact portion between the adjacent heat transfer plates 2,... Is sealed by brazing, and the main body portion 3 is formed.

  The first end plate 4 and the second end plate 5 are superimposed on the plurality of heat transfer plates 2,... So as to sandwich the plurality of stacked heat transfer plates 2,. In this state, the fitting portions 21 of the first end plate 4 and the second end plate 5 are fitted with the fitting portions 21 of the adjacent heat transfer plates 2. In connection with this, the close part of each of the 1st end plate 4 and the 2nd end plate 5, and the adjacent heat-transfer plate 2, ... (main-body part 3) is sealed by brazing.

  Thereby, as shown in FIG.2 and FIG.3, the 1st flow path 30 and the 2nd flow path 31 are alternately formed in the main-body part 3 on the boundary of the heat-transfer plate 2, .... In this embodiment, the 1st flow path 30 distribute | circulates the 1st fluid A in which phase changes, such as Freon and ammonia. The second flow path 31 circulates a liquid second fluid B such as water or brine.

  Further, the openings of the plurality of heat transfer plates 2,... Are connected, whereby the first inflow communication passage 32, the first outflow communication passage 33, the second inflow communication passage 34, and the second outflow communication passage 35 are respectively connected to the first inflow communication passage 32. It is formed extending in one direction.

  This will be described more specifically. In the present embodiment, the heat transfer section 20 of the heat transfer plates 2, ... is formed in a rectangular shape in plan view (viewed in the normal direction of the heat transfer section 20).

  The first inflow communication path 32 and the second outflow communication path 35 are provided on one end side of the heat transfer plates 2 in the longitudinal direction of the heat transfer section 20 (direction orthogonal to the first direction: hereinafter referred to as the second direction). It is done. Moreover, the 1st outflow communication path 33 and the 2nd inflow communication path 34 are provided in the other end side of the heat-transfer plate 2, ... in a 2nd direction.

  FIG. 3 is a schematic diagram. Therefore, the first inflow communication passage 32, the first outflow communication passage 33, the second inflow communication passage 34, and the second outflow communication passage 35 are arranged in the second direction in FIG. 3 (arranged in parallel). ) However, actually, the first inflow communication path 32 and the second outflow communication path 35 are in the short direction of the heat transfer section 20 (the direction orthogonal to the first direction and the second direction: hereinafter referred to as the third direction). Are lined up. Further, the second inflow communication passage 34 and the first outflow communication passage 33 are also arranged in the short direction (third direction) of the heat transfer section 20.

  Thereby, in the plate heat exchanger 1, the first fluid A flows through the first flow path 30 in the second direction orthogonal to the first direction. Further, the second fluid B flows in the second direction in the second flow path 31. That is, in the plate heat exchanger 1 according to this embodiment, the first fluid A flows in the longitudinal direction of the heat transfer section 20 in the first flow path 30, and the second fluid B flows in the second flow path 31. 20 circulates in the longitudinal direction.

  In the plate heat exchanger 1 of the present embodiment, at least one (one in the example of the present embodiment) first flow path 30 in the middle of the first direction is discharged from the first inflow communication path 32. This is the reference flow path Ra that is the starting point of the flow path of the first fluid A up to the communication path 33. The first inflow communication passage 32 communicates only with the reference channel Ra. On the other hand, the first outflow communication path 33 is a plurality of first flow paths 30 that are larger than the number of the reference flow paths Ra, and the flow path of the first fluid A that is formed starting from the reference flow path Ra. Are communicated only with the plurality of first flow paths 30,. The midway position in the present embodiment is an arbitrary position excluding the first flow paths 30 at both ends in the first direction.

  Here, the flow path (distribution system) of the first fluid A from the first inflow communication path 32 to the first outflow communication path 33 will be specifically described.

  In the plate heat exchanger 1 of the present embodiment, the single first flow path 30 at the center position in the first direction is the reference flow path Ra. And the main-body part 3 has a pair of primary branch paths 36a and 36a. The pair of primary branch paths 36a, 36a communicates the reference flow path Ra with at least one first flow path 30 located on one end side in the first direction with respect to the reference flow path Ra, and the reference flow path Ra, At least one first flow path 30 on the other end side in the first direction with respect to the reference flow path Ra is communicated. That is, the main body 3 communicates (connects) the reference channel Ra with at least one first channel 30 located on one end side in the first direction with respect to the reference channel Ra, and the reference branch channel 36a. There is a primary branch path 36a that communicates (connects) the flow path Ra and at least one first flow path 30 located on the other end side in the first direction with respect to the reference flow path Ra. In the present embodiment, the primary branch paths 36a and 36a pass through the central portion of the heat transfer section 20 in the second direction.

  In the present embodiment, the main body 3 includes a plurality of first flow paths 30 on each of one end side and the other end side in the first direction with respect to the reference flow path Ra.

  The plurality of first flow paths 30 of the main body 3 are divided into two or more blocks B1 and B2. In the main body 3 of the present embodiment, the entire one end side in the first direction is divided into a single block (hereinafter, this block is referred to as a first large block B1) with the reference channel Ra as a boundary. The main body 3 is divided into a single block (hereinafter, this block is referred to as a second large block B2) in the first direction with respect to the reference channel Ra as a boundary.

  The plurality of first flow paths 30 in each of the first large block B1 and the second large block B2 (one end side and the other end side with respect to the reference flow path Ra in the first direction) are a set of blocks B1a, B2a, B1b. , B2b. Each block B1a, B2a, B1b, B2b has three or more first flow paths 30, respectively.

  In the present embodiment, the first flow path 30 at the middle position in the first direction of each of the first large block B1 and the second large block B2 (the center position in the present embodiment) is the flow path of the first fluid A. This is the intermediate reference flow path Rb that becomes the branch position. That is, each of the first large block B1 and the second large block B2 includes all the first flow paths 30 (a plurality of first flow paths 30,...) On one end side in the first direction with the intermediate reference flow path Rb as a boundary. A single block (hereinafter, this block is referred to as a first small block) B1a, B2a and all the first flow paths 30 on the other end side in the first direction with the intermediate reference flow path Rb as a boundary (multiple blocks) Are divided into single blocks (hereinafter, this block is referred to as a second small block) B1b and B2b.

  The primary branch paths 36a and 36a communicate with the intermediate reference flow path Rb. More specifically, one primary branch path 36a passes through the second small block B1b in the first large block B1 and communicates with the intermediate reference flow path Rb of the first large block B1. The other primary branch path 36a passes through the first small block B2a in the second large block B2 and communicates with the intermediate reference flow path Rb of the second large block B2.

  And as above-mentioned, the main-body part 3 which concerns on this embodiment is divided on the intermediate | middle reference | standard flow path Rb in each of 1st large block B1 and 2nd large block B2. Accordingly, the main body 3 has at least a pair of secondary branch paths 36b and 36b. The pair of secondary branch passages 36b and 36b includes an intermediate reference flow path Rb and at least one first flow path 30 on one end side in the first direction from the intermediate reference flow path Rb or the intermediate reference flow path Rb. Also, at least one first flow path 30 on the other end side in the first direction is communicated (connected). That is, the main body 3 according to the present embodiment has a secondary branch path 36b that connects (connects) the intermediate reference flow path Rb and at least one first flow path 30 of the first small blocks B1a and B2a, and There is a secondary branch path 36b that communicates (connects) the intermediate reference path Rb and at least one first path 30 of the second small blocks B1b, B2b.

  In the present embodiment, each of the first small blocks B1a and B2a and the second small blocks B1b and B2b includes a plurality of first flow paths 30.

  Accordingly, the main body 3 includes connection paths 37a and 37b that connect the adjacent first flow paths 30 to each other in the first small blocks B1a and B2a and the second small blocks B1b and B2b.

  This will be described more specifically. In the present embodiment, each of the pair of secondary branch paths 36b and 36b communicates the intermediate reference flow path Rb and the first flow path 30 adjacent to the intermediate reference flow path Rb. That is, one secondary branch path 36b is the first flow path 30 in the first small blocks B1a and B2a, and communicates with the first flow path 30 adjacent to the intermediate reference flow path Rb. The other secondary branch path 36b is the first flow path 30 in the second small blocks B1b and B2b, and communicates with the first flow path 30 adjacent to the intermediate reference flow path Rb.

  As described above, each of the first small blocks B1a, B2a and the second small blocks B1b, B2b includes a plurality of first flow paths 30,. Accordingly, the main body 3 includes the first small blocks B1a and B2a (on the first large block B1 and the second large block B2 (one end side and the other end side relative to the reference channel Ra in the first direction)). At least one connection path 37a, 37b that connects the first flow paths 30,... On one end side of the intermediate reference flow path Rb in the first direction, and second small blocks B1b, B2b (intermediate reference in the first direction) It has at least one connection path 37a, 37b that connects the first flow paths 30, ... on the other end side with respect to the flow path Rb. That is, the main body 3 includes connection paths 37a and 37b that connect the adjacent first flow paths 30 and 30 to each other in each of the first small blocks B1a and B2a and the second small blocks B1b and B2b.

  In the present embodiment, each of the first small blocks B1a, B2a and the second small blocks B1b, B2b includes four first flow paths 30,. And the main-body part 3 which concerns on this embodiment is two connection paths 37a and 37b which connect the adjacent 1st flow paths 30 and 30 in each of 1st small block B1a, B2a and 2nd small block B1b, B2b. Is provided.

  One connection path (hereinafter referred to as a first connection path) 37a includes a single first flow path 30 that communicates with the secondary branch path 36b, and the side opposite to the intermediate reference flow path Rb with respect to the first flow path 30. And the adjacent first first flow paths (hereinafter referred to as primary-side first flow paths) 30. On the other hand, the other connection path 37 b (hereinafter referred to as the second connection path) 37 b is a primary side first flow path 30 communicating with the first connection path 37 a and an intermediate reference flow with respect to the primary side first flow path 30. The first flow paths 30 and 30 on the opposite side of the path Rb are connected to a plurality of first flow paths (hereinafter referred to as outermost first flow paths) 30 that are larger than the number of reference flow paths Ra. . In the present embodiment, there are three first flow paths 30,... Communicating with the secondary connection path 37 b. And the two 1st flow paths 30 and 30 except the primary side 1st flow path 30 which is one of them are connected with the 1st outflow communication path 33. FIG.

  The first connection path 37a and the second connection path 37b are arranged with an interval in the second direction. In this embodiment, the 1st connection path 37a penetrates the other end part of the heat-transfer plate 2 (heat-transfer part 20) in a 2nd direction. Moreover, the 2nd connection path 37b has penetrated the one end part of the heat-transfer plate 2 (heat-transfer part 20) in a 2nd direction. As a result, in each of the first small blocks B1a and B2a and the second small blocks B1b and B2b, the first fluid A flows from the intermediate reference flow path Rb to the first outflow communication path 33. Each time it moves to the adjacent first flow path 30,..., The flow direction changes in the second direction.

  In the present embodiment, the first inflow communication passage 32 extends from one end in the first direction to the reference channel Ra located in the middle of the first direction, and communicates only with the reference channel Ra.

  On the other hand, the first outflow communication path 33 extends from one end to the other end in the first direction, and is only in the outermost first flow paths 30, 30 of the first small blocks B1a, B2a and the second small blocks B1b, B2b. Communicate. That is, in the present embodiment, the ends of the flow paths of the first fluid A in the first large block B1 and the second large block B2 are plural in the first small blocks B1a and B2a and the second small blocks B1b and B2b, respectively. Of the first flow path 30.

  Accordingly, there are a plurality of first flow paths 30 in each of the first large block B1 and the second large block B2, and the second connection between the intermediate reference flow path Rb and the first outflow communication path 33. The plurality of first flow paths 30,... Communicating with only the path 37 b communicate with the first outflow communication path 33.

  In contrast, each of the second inflow communication passage 34 and the second outflow communication passage 35 extends from one end of the main body 3 to the other end in the first direction. Each of the plurality of second flow paths 31 arranged in the first direction communicates with the second inflow communication path 34 and the second outflow communication path 35.

  Therefore, in the plate heat exchanger 1 of the present embodiment, the flow path of the first fluid A is configured to meander between the first inflow communication path 32 and the first outflow communication path 33. On the other hand, the flow path of the second fluid B is configured straight between the second inflow communication passage 34 and the second outflow communication passage 35.

  As described above, the plate heat exchanger 1 according to the present embodiment includes the main body 3 including the plurality of stacked heat transfer plates 2. The main body 3 includes a first flow path 30 through which the first fluid A flows, a second flow path 31 through which the second fluid B flows, a first inflow communication path 32 that communicates with the first flow path 30, and a first outflow communication. A first inflow communication passage 32 and a first outflow communication passage 33 (a pair of first communication passages 32, 33) that allow the first fluid A to flow into and out of the first flow paths 30,. A second inflow communication path 34 and a second outflow communication path 35 (a pair of second communication paths 34, 35) communicating with the second flow paths 31,. The second inflow communication passage 34 and the second outflow communication passage 35 (a pair of second communication passages 34, 35) for allowing the second fluid B to flow in and out of the first fluid passage 31, are provided. And the 1st flow path 30, ... and the 2nd flow path 31, ... are formed alternately by making the heat-transfer plate 2, ... into a boundary. Each of the first inflow communication passage 32, the first outflow communication passage 33, the second inflow communication passage 34, and the second outflow communication passage 35 extends in the first direction through the heat transfer plates 2,. Yes. Then, the first flow paths 30 communicate with each other to form a flow path of the first fluid A from the first inflow communication path 32 to the first outflow communication path 33. In addition, at least one first flow path 30 among the plurality of first flow paths 30 is a reference flow path Ra that is a starting point of the flow path of the first fluid A. The first inflow communication passage 32 communicates only with the reference channel Ra. The first outflow communication passage 33 is a plurality of first flow passages 30 that are larger than the number of the reference flow passages Ra, and are only in the plurality of first flow passages 30 that are the end of the flow passage of the first fluid A. Communicate.

  As described above, according to the plate heat exchanger 1 according to the present embodiment, the plurality of first series passages 30,... Communicating with the first outflow communication passage 33 is larger than the number of the reference passages Ra. For this reason, the cross-sectional area of the flow path of the first fluid A from the first inflow communication passage 32 to the first outflow communication passage 33 increases as it goes downstream. Thereby, in the plate type heat exchanger 1 of the said structure, the increase in the pressure loss in the whole flow path of the 1st fluid A can be suppressed, and high heat exchange performance can be obtained.

  In the present embodiment, at least one first flow path 30 in the middle of the first direction is a reference flow path Ra that is the starting point of the flow path of the first fluid A. Further, the main body 3 includes at least one first flow path Ra and each of the first large block B1 and the second large block B2 (one end side and the other end side of the reference flow path Ra in the first direction). A pair of primary branch paths 36a, 36a communicating with one flow path 30 is provided. The first outflow communication passage 33 includes the end of the flow path of the first fluid A in each of the first large block B1 and the second large block B2 (one end side and the other end side with respect to the reference flow path Ra in the first direction). The plurality of first flow paths 30 are communicated only with the plurality of first flow paths 30, which are larger than the number of the reference flow paths Ra.

  As described above, in the plate heat exchanger 1 according to the present embodiment, the first inflow communication passage 32 communicates only with the reference flow channel Ra (first flow channel 30) located in the middle of the first direction. For this reason, the 1st inflow communication path 32 is formed only by the middle position in the 1st direction. Thereby, the increase in the pressure loss of the first fluid A in the first inflow communication passage 32 can be further suppressed.

  The pair of primary branch passages 36a and 36a are provided in the reference channel Ra and the first large block B1 and the second large block B2 (one end side and the other end side of the reference channel Ra in the first direction). A certain at least 1 1st flow path 30 is connected. For this reason, in the main body 3, as a flow path of the first fluid A, a system including one primary branch path 36 a communicating with the reference flow path Ra and the other primary branch path 36 a communicating with the reference flow path Ra. Two lines are formed with a line including

  Accordingly, the length of the flow path of the first fluid A from the first inflow communication path 32 to the first outflow communication path 33 (flow path length per system) is shortened. Thereby, in the plate type heat exchanger 1 of the said structure, the increase in the pressure loss in the whole flow path of the 1st fluid A is suppressed more, and high heat exchange performance is obtained.

  In the present embodiment, a plurality of first flow paths 30 are provided in each of the first large block B1 and the second large block B2 (one end side and the other end side with respect to the reference flow path Ra in the first direction). In each of the first large block B1 and the second large block B2 (one end side and the other end side with respect to the reference flow path Ra in the first direction), a midway position in the first direction among the plurality of first flow paths 30,. The first flow path 30 is an intermediate reference flow path Rb that is a branch position of the flow path of the first fluid A. The main body 3 includes at least one first reference block Rb and each of the first large block B1 and the second large block B2 (one end side and the other end side of the intermediate reference flow path Rb in the first direction). A pair of secondary branch passages 36b and 36b for communicating with one flow path 30 is provided. Each of the primary branch paths 36a, 36a communicates with the intermediate reference flow path Rb in each of the first large block B1 and the second large block B2 (one end side and the other end side with respect to the reference flow path Ra in the first direction). doing.

  Accordingly, the primary branch paths 36a and 36a are located in the first direction in the first large block B1 and the second large block B2 (one end side and the other end side from the reference flow path Ra in the first direction). Are communicated only with the intermediate reference channel Rb (first channel 30). Accordingly, in each of the first large block B1 and the second large block B2 (one end side and the other end side with respect to the reference flow path Ra in the first direction), the primary branch paths 36a and 36a reach the midway position in the first direction. It is formed only in For this reason, an increase in the pressure loss of the first fluid A in the primary branch paths 36a, 36a is suppressed.

  And in each of the 1st large block B1 and 2nd large block B2 (one end side and other end side rather than the reference | standard flow path Ra in a 1st direction) of the main-body part 3, it is an intermediate | middle reference | standard as a flow path of the 1st fluid A Two systems are formed: a system including one secondary branch path 36b communicating with the flow path Rb and a system including the other secondary branch path 36b communicating with the intermediate reference flow path Rb.

  Therefore, in each of the first large block B1 and the second large block B2 (one end side and the other end side with respect to the reference flow path Ra in the first direction) of the main body 3, the primary outflow communication path 33 from the primary branch path 36a. The length of the flow path of the first fluid A (flow path length per system) becomes shorter. Thereby, in the plate type heat exchanger 1 of the said structure, the increase in the pressure loss in the whole flow path of the 1st fluid A is suppressed further, and high heat exchange performance is obtained.

  In addition, the first flow path 30,... Includes the first small block B1a, B2a and the second large block B1 and the second large block B2 (one end side and the other end side from the reference flow path Ra in the first direction). A plurality of small blocks B1b and B2b (one end side and the other end side of the intermediate reference flow path Rb in the first direction) are provided. The pair of secondary branch paths 36b and 36b are respectively connected to the first small blocks B1a and B2a and the second small blocks B1b and B2b (one end side and the other end side from the intermediate reference flow path Rb in the first direction). It communicates with a certain first flow path 30. The main body 3 includes first small blocks B1a and B2a (in the first direction) in each of the first large block B1 and the second large block B2 (one end side and the other end side with respect to the reference channel Ra in the first direction). At least one connection path 37a, 37b that connects the first flow paths 30,... Located on one end side of the intermediate reference flow path Rb, and second small blocks B1b, B2b (from the intermediate reference flow path Rb in the first direction). Also has at least one connection path 37a, 37b for connecting the first flow paths 30,. The first outflow communication passage 33 is a single second in each of the first small blocks B1a, B2a and the second small blocks B1b, B2b (one end side and the other end side from the intermediate reference flow path Rb in the first direction). A plurality of first flow paths 30,... That communicate with each other via connection paths (connection paths) 37 b, and only a plurality of first flow paths 30,. Thereby, the heat transfer area can be increased without increasing the flow path length of the first fluid A from the first inflow communication path 32 to the first outflow communication path 33.

  In particular, the main body 3 includes, as connection paths 37a and 37b, a first connection path 37a that communicates with the first flow path 30 that communicates with the secondary branch path 36b and another first flow path 30; It has the 2nd connection path 37b which makes the some 1st flow path 30 including ... the 1st flow path 30 connect. The 1st connection path 37a and the 2nd connection path 37b are arrange | positioned at intervals in the 2nd direction (direction orthogonal to a 1st direction). The first inflow communication path 32 communicates with the first flow paths 30 other than the other first flow path 30 among the plurality of first flow paths 30 connected to the second connection path 37b. Thereby, the flow path of the first fluid A from the reference flow path Ra to the second connection path 37b becomes a meandering flow path. The first fluid A that circulates through the first flow paths 30 that constitute the meandering flow path, and the second fluid B that circulates through the second flow paths 31, adjacent to the first flow paths 30,. The timing of heat exchange with is different. Therefore, as the first fluid A moves from the upstream side to the downstream side, the first fluid A and the second fluid B reliably exchange heat.

  It should be noted that the plate heat exchanger according to the present invention is not limited to the above-described embodiment, and it is needless to say that modifications can be appropriately made without departing from the gist of the present invention.

  In the plate heat exchanger 1 of the above embodiment, the flow path of the first fluid A in the first large block B1 and the flow path of the first fluid A in the second large block B2 are based on the reference flow path Ra. Although it formed symmetrically, it is not limited to this. The flow path of the first fluid A in the first large block B1 and the flow path of the first fluid A in the second large block B2 may be formed in an asymmetric form with respect to the reference flow path Ra. That is, the first large block B1 and the second large block B2 may differ in the number of the first flow paths 30, ..., the arrangement of the intermediate reference flow path Rb, the arrangement of the secondary branch path 36b, and the like.

  In the above embodiment, each of the first large block B1 and the second large block B2 has two small blocks (first small block and second small block) B1a, B2a, B1b, Although divided into B2b, it is not limited to this. For example, all the first flow paths 30 in each of the first large block B1 and the second large block B2 on both sides of the reference flow path Ra may be directly communicated with the first outflow communication path 33. Even in this case, the first outflow communication passage 33 is a plurality of first flow paths 30,... Larger than the number of the reference flow paths Ra, and a plurality of first flows serving as terminal ends of the first fluid A flow paths. It communicates only with the road 30. For this reason, the cross-sectional area of the flow path of the first fluid A from the first inflow communication path 32 to the first outflow communication path 33 increases as it goes downstream. Therefore, in the plate heat exchanger having such a configuration, an increase in pressure loss in the entire flow path of the first fluid A is suppressed as in the above embodiment, and high heat exchange performance is obtained.

  In the above embodiment, in the first small blocks B1a and B2a and the second small blocks B1b and B2b, a single first flow path 30 adjacent to the intermediate reference flow path Rb and another second adjacent to the first flow path 30 are provided. Although the one flow path 30 communicated with the first connection path 37a, the present invention is not limited to this. For example, as shown in FIG. 4, the secondary branch path 36b communicates with the first flow path 30 adjacent to the intermediate reference flow path Rb, and the first connection path 37a communicates with the first flow path 30 communicated with the secondary branch path 36b. , A first group constituted by a plurality of first flow paths 30 including a first flow path 30 adjacent to the first flow path 30, and a plurality of first flow paths 30, which are larger than the number of reference flow paths Ra, Communicate with the first group consisting of. The second connection path 37b is a first group and a second group adjacent to the first group, and a plurality of first channels 30, more than the number of the first channels 30,. The first outflow communication passage 30 may be communicated with a plurality of first flow paths 30,... Constituting the second group.

  Each of the pair of secondary branch paths 36b and 36b includes a first small block B1a and B2a and a second small block B1b and B2b (one end side and the other end side of the intermediate reference channel in the first direction). The main body 30 may have the following configuration on the assumption that the first flow passages 30 are communicated with each other.

  The main body 3 includes first small blocks B1a and B2a (in the first direction) in each of the first large block B1 and the second large block B2 (one end side and the other end side with respect to the reference channel Ra in the first direction). The first flow path 30 that communicates with one of the secondary branch paths 36b (on one end side of the intermediate reference flow path Rb), and another plurality that is larger than the number of the first flow paths 30 that communicate with the secondary branch path 36b. Of the first flow path 30,..., And the second small blocks B 1 b and B 2 b (the other end side of the intermediate reference flow path Rb in the first direction). A first flow path 30 that communicates with the secondary branch path 36b is connected to a plurality of other first flow paths 30 that are larger than the number of first flow paths 30 that communicate with the secondary branch path 36b. Connection path (second connection path) 37b. The first outflow communication passage 33 is located in each of the first small blocks B1a and B2a and the second small blocks B1b and B2b (one end side and the other end side from the intermediate reference flow path Rb in the first direction). The plurality of first flow paths (a plurality of first flow paths communicating only with the second connection path 37b) 30,.

  If it does in this way, the flow path which the group (block) of the 1st flow paths 30, ... connected by the connection paths 37a and 37b connected will be formed. At this time, the number of the first flow paths 30,... Constituting the second group (the group of the first flow paths 30,...) On the downstream side is the first group (first flow path on the upstream side in the flow direction of the first fluid A. The number of first flow paths 30,... Constituting the group of 30,. Thereby, the cross-sectional area of the flow path of the first fluid A from the first inflow communication path 32 to the first outflow communication path 33 increases stepwise, and as a result, the cross-sectional area of the flow path of the first fluid A suddenly increases. It doesn't get bigger. Therefore, even if the number of the first flow paths 30 is increased by increasing the number of the heat transfer plates 2, ... (even if the heat transfer area contributing to heat exchange in the entire main body 3 is increased), Smooth flow of the first fluid A can be ensured while suppressing an increase in pressure loss in the flow path.

  In the above embodiment, the first large block B1 and the second large block B2 are only divided into the first small blocks B1a and B2a and the second small blocks B1b and B2b, but are not limited thereto. For example, the first small blocks B1a and B2a and the second small blocks B1b and B2b may be partitioned into smaller blocks. However, also in this case, the first outflow communication path 33 is a plurality of first flow paths 30,... Larger than the number of the reference flow paths Ra, and the flow path of the first fluid A within the subdivided blocks. Are communicated only with the plurality of first flow paths 30,.

  In the said embodiment, the flow path of the 1st fluid A turns into a meandering flow path by connecting the 1st flow path 30 continuously in each of 1st small block B1a, B2a and 2nd small block B1b, B2b. However, it is not limited to this. For example, each of the first small blocks B1a and B2a and the second small blocks B1b and B2b includes a plurality of first flow paths 30. All of the plurality of first flow paths 30 may communicate with the secondary branch paths 36 b and 36 b and with the first outflow communication path 33. In this way, the first fluid A flows from the secondary branch passages 36 b and 36 b into the plurality of first flow paths 30,..., And flows through the plurality of first flow paths 30 to the first outflow communication path 33. leak. Thus, since the first fluid A circulates through the plurality of first flow paths 30, a large heat transfer area is ensured without extending the flow path length of the first fluid A, thereby improving the heat exchange performance. Become.

  Although the main-body part 3 of the said embodiment has a pair of primary branch paths 36a and 36a, it is not limited to this structure. The main body 3 may have two or more pairs of primary branch paths 36a. That is, the main body 3 includes at least a pair of primary branch paths 36a. What is necessary is just to have 36a.

  In this case, each of the second pair of primary branch paths 36a and 36a has a reference flow path Ra that is more than the area (first area) where the flow path of the first fluid A starts from the first pair of primary branch paths 36a and 36a. However, it communicates only with the primary flow path 30 in the outer region (second region). Then, the flow path of the first fluid A starting from the primary branch path (one primary branch path of the second pair of primary branch paths 36a, 36a) 36a on one end side of the reference flow path Ra in the first direction. , And a primary branch path on the other end side of the reference flow path Ra in the first direction (the other primary branch of the second pair of primary branch paths 36a and 36a). Each of the plurality of first flow paths 30,..., Which ends in the flow path of the first fluid A starting from the path 36 a, communicates with the first outflow communication path 33. At this time, the flow of the first fluid A starting from the primary branch path (one primary branch path of the second pair of primary branch paths 36a, 36a) 36a on one end side of the reference flow path Ra in the first direction. And a first fluid A starting from a primary branch path (the other primary branch path of the second pair of primary branch paths 36a, 36a) 36a on the other end side of the reference path Ra in the first direction. These flow paths are all arranged in the second region. Further, in the first fluid A flow path starting from the second pair of primary branch paths 36a, 36a, the number of the first flow paths 30,... There are many.

  That is, the n (natural number) paired primary branch passages 36a and 36a communicate with only the first flow path 30 in the region (nth region) outside the n-1 region in the main body 3, and the nth pair. The first fluid A may be provided in the nth region starting from the primary branch passages 36a, 36a.

  In the above embodiment, each of the plurality of second flow paths 31,... Communicates with the second inflow communication path 34 and the second outflow communication path 35, and the second inflow communication path 34 and the second outflow communication path 35 are connected to each other. The flow path of the second fluid B to be connected is configured straight, but is not limited thereto. For example, the flow path of the second fluid B connecting the second inflow communication path 34 and the second outflow communication path 35 may be formed to meander in the same manner as the flow path of the first fluid A. That is, the flow path of the second fluid B branches at least once on each of the one end side and the other end side of the main body 3 in the first direction, like the flow path of the first fluid A, and the second outflow communication path 35 is the second flow path 31 on each of the one end side and the other end side of the main body 3 in the first direction, and only in the second flow path 31 serving as the end of the flow path through which the second fluid B flows. You may communicate. Even in this case, a flow path that is a branch position of the flow path of the second fluid B is set, and the flow path of the second fluid B is divided into two or more blocks by dividing the flow path into subdivided blocks. You may make it make it.

DESCRIPTION OF SYMBOLS 1 ... Plate type heat exchanger, 2 ... Heat transfer plate, 3 ... Main-body part, 4 ... 1st end plate (end plate), 5 ... 2nd end plate (end plate), 20 ... Heat transfer part, 21 ... Fit 30 ... first flow path, 31 ... second flow path, 32 ... first inflow communication path (one first series path), 33 ... first outflow communication path (the other first series path), 34 ... Second inflow communication path (one second communication path), 35 ... second outflow communication path (the other second communication path), 36a ... primary branch path, 36b ... secondary branch path, 36c ... tertiary branch path, 37a ... 1st connection path (connection path), 37b ... 2nd connection path (connection path), 40, 50 ... Sealing part, 41, 51 ... Fitting part, A ... 1st fluid, B ... 2nd fluid, B1 ... first large block (block), B2 ... second large block (block), B1a, B2a ... first small block (block), 1b, B2b ... second small block (Block), B1a, B2a ... first small block (Block), Ra ... reference channel, Rb ... intermediate reference channel

[Cross-reference of related applications]
This application claims the priority of Japanese Patent Application No. 2013-74894, and the content of Japanese Patent Application No. 2013-74894 is incorporated in the description of the present specification by reference.

  The present invention relates to a plate heat exchanger used as an evaporator and a condenser.

  Conventionally, a plate heat exchanger has an evaporator that evaporates the first fluid in association with heat exchange between the first fluid and the second fluid, and a first in association with heat exchange between the first fluid and the second fluid. It is widely used as a heat exchanger used in a condenser that condenses fluid (for example, see Patent Document 1).

  In general, the plate heat exchanger includes a main body 3 including a plurality of heat transfer plates 2, as shown in FIG. The main body 3 includes a first flow path 30, a second flow path 31, a pair of first series passages 32 and 33, and a pair of second communication paths 34 and 35. The first flow path 30 allows the first fluid A to flow. The second flow path 31 circulates the second fluid B. The pair of first series passages 32 and 33 communicate with the first flow path 30 and allow the first fluid A to flow into and out of the first flow path 30. The pair of second communication passages 34 and 35 communicate with the second flow path 31 and allow the second fluid B to flow into and out of the second flow path 31.

  This will be described more specifically. The plurality of heat transfer plates 2, ... each have at least four openings (not numbered). And in the main-body part 3, several heat-transfer plate 2, ... is laminated | stacked. Thereby, the 1st flow path 30 which distribute | circulates the 1st fluid A and the 2nd flow path 31 which distribute | circulates the 2nd fluid B are alternately formed by using the heat-transfer plates 2 ... as a boundary. Further, by stacking the plurality of heat transfer plates 2,..., The openings formed in the heat transfer plate 2 are continuous in the stacking direction of the plurality of heat transfer plates 2. Accordingly, one first series passage 32 that allows the first fluid A to flow into the first flow path 30, the other second series path 33 that causes the first fluid A to flow out from the first flow path 30, and the second flow path 31. One second communication passage 34 for allowing the second fluid B to flow into the second fluid passage B and the other second communication passage 35 for allowing the second fluid B to flow out from the second flow passage 31 pass through the heat transfer plates 2,. It extends in the stacking direction of the plurality of heat transfer plates 2 (see, for example, Patent Document 1).

  In this type of plate heat exchanger 1, the first fluid A supplied to one of the first series passages 32 flows out through the first flow path 30 to the other first series passage 33. Further, the second fluid B supplied to one second communication passage 34 flows out to the other second communication passage 35 through the second flow path 31. In the plate heat exchanger 1, the first fluid A flows through the first flow path 30 and the second fluid B flows through the second flow path 31 as described above. As a result, the plate heat exchanger 1 exchanges heat between the first fluid A and the second fluid B via the wide heat transfer surface of the heat transfer plate 2 that partitions the first flow path 30 and the second flow path 31. Let

  By the way, in this kind of plate-type heat exchanger 1, when the number of laminated heat transfer plates 2,... Increases, the heat transfer area contributing to heat exchange increases and the heat exchange performance increases.

  However, when the number of heat transfer plates 2,... Increases, the length of the first series passages 32, 33 and the second communication passages 34, 35 extending in the stacking direction of the heat transfer plates 2,. It becomes longer according to the number of plates 2.

  That is, each of the pair of first series passages 32, 33 and the pair of second communication paths 34, 35 is formed by the openings of the heat transfer plates 2,. The flow path lengths of the 33 and the pair of second communication passages 34 and 35 become longer as the number of the heat transfer plates 2.

  As a result, the flow resistance of the first fluid A in the first series passage (one first series passage) 32 through which the first fluid A flows into the first flow path 30 increases, and the first fluid A becomes difficult to flow. . Therefore, in this type of plate heat exchanger 1, the inflow amount of the first fluid A to the first flow path 30 on the inlet side of one first series passage 32 and the back side of one first series path 32. The amount of the first fluid A flowing into the first flow path 30 is not uniform. That is, in this type of plate heat exchanger 1, uneven distribution of the first fluid A occurs with respect to the plurality of first flow paths 30 arranged in the stacking direction of the heat transfer plates 2. As a result, in this type of plate heat exchanger 1, the heat exchange performance (evaporation performance) is improved even if the number of the heat transfer plates 2,. There is a limit.

JP-A-11-287572

  Accordingly, the present invention provides a plate heat exchanger that can uniformly supply the first fluid to the plurality of first flow paths while suppressing an increase in pressure loss in the plurality of first flow paths through which the first fluid flows. The issue is to provide.

The plate heat exchanger according to the present invention includes a main body portion including a plurality of stacked heat transfer plates, and the main body portion includes a plurality of first flow paths through which the first fluid flows and a plurality of the second fluid through which the second fluid flows. And a pair of first passages communicating with the first passage, a pair of first passages allowing the first fluid to flow into and out of the first passage, and a pair communicating with the second passage. And a pair of second communication passages for allowing the second fluid to flow into and out of the second flow path, and the first flow path and the second flow path are alternately arranged with the heat transfer plate as a boundary. In the plate heat exchanger in which each of the first series passage and the second communication passage extends through the heat transfer plate in the stacking direction of the heat transfer plates, the first flow paths communicate with each other. the flow path of the first fluid from one of the first communication passage to the other of the first communication passage formed, the stacking direction of the heat transfer plate At least one of the first channels is in the middle position is a reference channel as a starting point of the flow path of the first fluid, the body portion, the reference channel and one side of the reference channel in the laminating direction of the heat transfer plate And at least a pair of primary branch passages communicating with at least one first flow path on each of the other end sides, one first series passage communicating only with the reference flow path, and the other first series passage Is a plurality of first flow paths that are terminal ends of the flow path of the first fluid on each of the one end side and the other end side of the reference flow paths in the stacking direction of the heat transfer plates, and is larger than the number of reference flow paths It is characterized by communicating only with a plurality of first flow paths.

  In this case, a plurality of first flow paths are provided on each of one end side and the other end side of the reference flow path in the stacking direction of the heat transfer plates, and one end side and the other end of the reference flow path in the stacking direction of the heat transfer plates. In each of the sides, the first flow path in the middle of the stacking direction of the heat transfer plates among the plurality of first flow paths is an intermediate reference flow path that becomes a branch position of the flow path of the first fluid, A pair of secondary branch passages that connect the intermediate reference flow path and at least one first flow path on each of the one end side and the other end side of the intermediate reference flow path in the stacking direction of the heat transfer plates; Each of the primary branch paths may be in communication with an intermediate reference channel on each of the one end side and the other end side of the reference channel in the stacking direction of the heat transfer plates.

  As a specific aspect, the first flow path has one end side and an intermediate reference flow path in the stacking direction of the heat transfer plates on each of the one end side and the other end side of the reference flow path in the stacking direction of the heat transfer plates. A plurality of secondary branch paths are provided on each of the other end sides, and each of the pair of secondary branch paths communicates with one first flow path on each of the one end side and the other end side of the intermediate reference flow path in the stacking direction of the heat transfer plates. The main body portion includes the first flow paths on one end side with respect to the intermediate reference flow path in the stacking direction of the heat transfer plates on each of the one end side and the other end side with respect to the reference flow path in the stacking direction of the heat transfer plates. At least one connection path for connecting, and at least one connection path for connecting the first flow paths on the other end side with respect to the intermediate reference flow path in the stacking direction of the heat transfer plates, and the other first series path A plurality of first flow paths communicating via a single connection path on each of the one end side and the other end side with respect to the intermediate reference flow path in the stacking direction of the heat transfer plates, and more than the number of reference flow paths You may communicate only with several 1st flow paths.

  In this case, the main body portion includes, as the connection path, a first connection path that connects the first flow path that communicates with the secondary branch path and another first flow path, and a plurality of first flow paths that include the other first flow path. The first connection path and the second connection path are arranged at intervals in a direction orthogonal to the stacking direction of the heat transfer plates, and the other first series path is You may communicate with 1st flow paths other than said another 1st flow path among several 1st flow paths connected to the 2nd connection path.

Further, as a specific other aspect, the first flow path has one end than the intermediate reference flow path in the stacking direction of the heat transfer plates on each of the one end side and the other end side of the reference flow path in the stacking direction of the heat transfer plates. A plurality of first flow paths are provided on each of one side and the other side of the intermediate reference flow path in the stacking direction of the heat transfer plates. The main body portion is one of the secondary ends at one end side of the intermediate reference flow path in the stacking direction of the heat transfer plates on each of the one end side and the other end side of the reference flow path in the stacking direction of the heat transfer plates. Intermediate reference flow in the stacking direction of the heat transfer plate, a first flow path communicating with the branch path, a connection path connecting a plurality of other first flow paths larger than the number of first flow paths communicating with the secondary branch path The other end side of the road First flow passage communicating with the secondary branch of Oite other, and a connecting passage and which connects the first flow path a plurality of other first channels greater than the number of communicating with the secondary branch path the, other The first series passages may communicate only with the plurality of other first flow paths on the one end side and the other end side of the intermediate reference flow path in the stacking direction of the heat transfer plates.

FIG. 1 is a schematic overall perspective view of a plate heat exchanger according to an embodiment of the present invention. FIG. 2 is a schematic exploded perspective view of the plate heat exchanger according to the embodiment. FIG. 3 is a schematic diagram for explaining the flow path of the first fluid and the flow path of the second fluid of the plate heat exchanger according to the embodiment. FIG. 4 is a schematic diagram for explaining the flow path of the first fluid and the flow path of the second fluid of the plate heat exchanger according to another embodiment of the present invention. FIG. 5 is a schematic diagram for explaining the flow path of the first fluid and the flow path of the second fluid of the conventional plate heat exchanger.

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

  As shown in FIG. 1, the plate heat exchanger includes a main body 3 including a plurality of stacked heat transfer plates 2.

  As shown in FIGS. 2 and 3, the main body 3 includes a first flow path 30, a second flow path 31, a pair of first series passages 32 and 33, and a pair of second communication paths 34 and 35. . The first flow path 30 allows the first fluid A to flow. The second flow path 31 circulates the second fluid B. The pair of first series passages 32 and 33 communicate with the first flow path 30 and allow the first fluid A to flow into and out of the first flow path 30. The pair of second communication passages 34 and 35 communicate with the second flow path 31 and allow the second fluid B to flow into and out of the second flow path 31. In the following description, one of the pair of first series passages 32 and 33 is referred to as a “first inflow communication path”. The other first series passage 33 of the pair of first series passages 32 and 33 is referred to as a “first outflow communication path”. One of the pair of second communication passages 34 and 35 is referred to as a “second inflow communication passage”. The other second communication path 35 of the pair of second communication paths 34 and 35 is referred to as a “second outflow communication path”.

  The first flow path 30 and the second flow path 31 are alternately formed with the heat transfer plates 2,. On the other hand, each of the first inflow communication path 32, the first outflow communication path 33, the second inflow communication path 34, and the second outflow communication path 35 passes through the heat transfer plates 2,. The plate 2 extends in the stacking direction (hereinafter referred to as the first direction).

  This will be described more specifically. The plate type exchanger 1 according to this embodiment includes a main body 3 including a plurality of stacked heat transfer plates 2, and a pair of end plates 4 and 5 sandwiching the main body 3.

  Each of the plurality of heat transfer plates 2, ... is formed by press-molding a metal plate. As shown in FIG. 2, each of the heat transfer plates 2,... Has a heat transfer section 20 that defines the first flow path 30 and the second flow path 31, and the heat transfer section 20 extends in a direction that intersects the heat transfer section 20. And an annular fitting portion 21 extending from the outer periphery.

  A plurality of recesses and protrusions (not shown) are alternately formed on the front and back of the heat transfer section 20 of each heat transfer plate 2. And in the heat-transfer part 20 of each heat-transfer plate 2, ..., the 1st inflow communication path 32, the 1st outflow communication path 33, the 2nd inflow communication path 34, and the 2nd outflow communication path 35 are formed. An opening (not numbered) is formed. That is, openings are provided in at least four places of the heat transfer section 20 of the heat transfer plates 2. This opening is for forming a flow path extending in the first direction and penetrates the heat transfer section 20.

  The plate heat exchanger 1 according to this embodiment includes a plurality of types of heat transfer plates 2. The plate heat exchanger 1 according to the present embodiment forms the first inflow communication passage 32, the first outflow communication passage 33, the second inflow communication passage 34, and the second outflow communication passage 35 as described above. In addition to the heat transfer plates 2 formed with openings, the heat transfer plates 2 formed with openings for forming primary branch paths 36a and 36a or secondary branch paths 36b and 36b described later are provided. In the present embodiment, the first inflow communication path 32, the first outflow communication path 33, the second inflow communication path 34, the second outflow communication path 35, the primary branch paths 36a and 36a, and the secondary branch paths 36b and 36b. The flow paths such as are described in detail. Further, the number, arrangement, and size of the openings for forming these are the same as the general plate heat exchanger, the purpose of use of the plate heat exchanger 1, the first fluid A, and the second fluid B. It is appropriately selected depending on the type and flow rate.

  Each of the pair of end plates 4 and 5 is formed by press-molding a metal plate, and is formed in substantially the same shape as the heat transfer plates 2. Specifically, the end plates 4 and 5 include sealing portions 40 and 50 and annular fitting portions 41 and 51. The sealing parts 40 and 50 are formed in substantially the same shape as the heat transfer part 20. The annular fitting portions 41 and 51 extend from the entire outer periphery of the sealing portions 40 and 50 in a direction crossing the sealing portions 40 and 50.

  One end plate (hereinafter referred to as a first end plate) 4 is an opening formed in adjacent heat transfer plates 2,..., And includes a first inflow communication path 32, a first outflow communication path 33, and a second inflow. An opening (not numbered) corresponding to the opening for forming the communication path 34 and the second outflow communication path 35 is provided. That is, the openings are provided at four locations on the sealing portion 40 of the first end plate 4. Accordingly, cylindrical nozzles (not numbered) for connecting pipes are connected to the outer surface of the sealing portion 40 of the first end plate 4 in an arrangement corresponding to each opening.

  On the other hand, the opening part is not provided in the sealing part 50 of the other end plate (hereinafter referred to as the second end plate) 5. That is, the second end plate 5 includes a sealing portion 50 that can seal a flow path formed by the openings of the heat transfer plates 2.

  The plurality of heat transfer plates 2,. In this state, the protrusions of the heat transfer portions 20 of the adjacent heat transfer plates 2,... Intersect each other, and the fitting portions 21 of the adjacent heat transfer plates 2,. Along with this, the close contact portion between the adjacent heat transfer plates 2,... Is sealed by brazing, and the main body portion 3 is formed.

  The first end plate 4 and the second end plate 5 are superimposed on the plurality of heat transfer plates 2,... So as to sandwich the plurality of stacked heat transfer plates 2,. In this state, the fitting portions 21 of the first end plate 4 and the second end plate 5 are fitted with the fitting portions 21 of the adjacent heat transfer plates 2. In connection with this, the close part of each of the 1st end plate 4 and the 2nd end plate 5, and the adjacent heat-transfer plate 2, ... (main-body part 3) is sealed by brazing.

  Thereby, as shown in FIG.2 and FIG.3, the 1st flow path 30 and the 2nd flow path 31 are alternately formed in the main-body part 3 on the boundary of the heat-transfer plate 2, .... In this embodiment, the 1st flow path 30 distribute | circulates the 1st fluid A in which phase changes, such as Freon and ammonia. The second flow path 31 circulates a liquid second fluid B such as water or brine.

  Further, the openings of the plurality of heat transfer plates 2,... Are connected, whereby the first inflow communication passage 32, the first outflow communication passage 33, the second inflow communication passage 34, and the second outflow communication passage 35 are respectively connected to the first inflow communication passage 32. It is formed extending in one direction.

  This will be described more specifically. In the present embodiment, the heat transfer section 20 of the heat transfer plates 2, ... is formed in a rectangular shape in plan view (viewed in the normal direction of the heat transfer section 20).

  The first inflow communication path 32 and the second outflow communication path 35 are provided on one end side of the heat transfer plates 2 in the longitudinal direction of the heat transfer section 20 (direction orthogonal to the first direction: hereinafter referred to as the second direction). It is done. Moreover, the 1st outflow communication path 33 and the 2nd inflow communication path 34 are provided in the other end side of the heat-transfer plate 2, ... in a 2nd direction.

  FIG. 3 is a schematic diagram. Therefore, the first inflow communication passage 32, the first outflow communication passage 33, the second inflow communication passage 34, and the second outflow communication passage 35 are arranged in the second direction in FIG. 3 (arranged in parallel). ) However, actually, the first inflow communication path 32 and the second outflow communication path 35 are in the short direction of the heat transfer section 20 (the direction orthogonal to the first direction and the second direction: hereinafter referred to as the third direction). Are lined up. Further, the second inflow communication passage 34 and the first outflow communication passage 33 are also arranged in the short direction (third direction) of the heat transfer section 20.

  Thereby, in the plate heat exchanger 1, the first fluid A flows through the first flow path 30 in the second direction orthogonal to the first direction. Further, the second fluid B flows in the second direction in the second flow path 31. That is, in the plate heat exchanger 1 according to this embodiment, the first fluid A flows in the longitudinal direction of the heat transfer section 20 in the first flow path 30, and the second fluid B flows in the second flow path 31. 20 circulates in the longitudinal direction.

  In the plate heat exchanger 1 of the present embodiment, at least one (one in the example of the present embodiment) first flow path 30 in the middle of the first direction is discharged from the first inflow communication path 32. This is the reference flow path Ra that is the starting point of the flow path of the first fluid A up to the communication path 33. The first inflow communication passage 32 communicates only with the reference channel Ra. On the other hand, the first outflow communication path 33 is a plurality of first flow paths 30 that are larger than the number of the reference flow paths Ra, and the flow path of the first fluid A that is formed starting from the reference flow path Ra. Are communicated only with the plurality of first flow paths 30,. The midway position in the present embodiment is an arbitrary position excluding the first flow paths 30 at both ends in the first direction.

  Here, the flow path (distribution system) of the first fluid A from the first inflow communication path 32 to the first outflow communication path 33 will be specifically described.

  In the plate heat exchanger 1 of the present embodiment, the single first flow path 30 at the center position in the first direction is the reference flow path Ra. And the main-body part 3 has a pair of primary branch paths 36a and 36a. The pair of primary branch paths 36a, 36a communicates the reference flow path Ra with at least one first flow path 30 located on one end side in the first direction with respect to the reference flow path Ra, and the reference flow path Ra, At least one first flow path 30 on the other end side in the first direction with respect to the reference flow path Ra is communicated. That is, the main body 3 communicates (connects) the reference channel Ra with at least one first channel 30 located on one end side in the first direction with respect to the reference channel Ra, and the reference branch channel 36a. There is a primary branch path 36a that communicates (connects) the flow path Ra and at least one first flow path 30 located on the other end side in the first direction with respect to the reference flow path Ra. In the present embodiment, the primary branch paths 36a and 36a pass through the central portion of the heat transfer section 20 in the second direction.

  In the present embodiment, the main body 3 includes a plurality of first flow paths 30 on each of one end side and the other end side in the first direction with respect to the reference flow path Ra.

  The plurality of first flow paths 30 of the main body 3 are divided into two or more blocks B1 and B2. In the main body 3 of the present embodiment, the entire one end side in the first direction is divided into a single block (hereinafter, this block is referred to as a first large block B1) with the reference channel Ra as a boundary. The main body 3 is divided into a single block (hereinafter, this block is referred to as a second large block B2) in the first direction with respect to the reference channel Ra as a boundary.

  The plurality of first flow paths 30 in each of the first large block B1 and the second large block B2 (one end side and the other end side with respect to the reference flow path Ra in the first direction) are a set of blocks B1a, B2a, B1b. , B2b. Each block B1a, B2a, B1b, B2b has three or more first flow paths 30, respectively.

  In the present embodiment, the first flow path 30 at the middle position in the first direction of each of the first large block B1 and the second large block B2 (the center position in the present embodiment) is the flow path of the first fluid A. This is the intermediate reference flow path Rb that becomes the branch position. That is, each of the first large block B1 and the second large block B2 includes all the first flow paths 30 (a plurality of first flow paths 30,...) On one end side in the first direction with the intermediate reference flow path Rb as a boundary. A single block (hereinafter, this block is referred to as a first small block) B1a, B2a and all the first flow paths 30 on the other end side in the first direction with the intermediate reference flow path Rb as a boundary (multiple blocks) Are divided into single blocks (hereinafter, this block is referred to as a second small block) B1b and B2b.

  The primary branch paths 36a and 36a communicate with the intermediate reference flow path Rb. More specifically, one primary branch path 36a passes through the second small block B1b in the first large block B1 and communicates with the intermediate reference flow path Rb of the first large block B1. The other primary branch path 36a passes through the first small block B2a in the second large block B2 and communicates with the intermediate reference flow path Rb of the second large block B2.

  And as above-mentioned, the main-body part 3 which concerns on this embodiment is divided on the intermediate | middle reference | standard flow path Rb in each of 1st large block B1 and 2nd large block B2. Accordingly, the main body 3 has at least a pair of secondary branch paths 36b and 36b. The pair of secondary branch passages 36b and 36b includes an intermediate reference flow path Rb and at least one first flow path 30 on one end side in the first direction from the intermediate reference flow path Rb or the intermediate reference flow path Rb. Also, at least one first flow path 30 on the other end side in the first direction is communicated (connected). That is, the main body 3 according to the present embodiment has a secondary branch path 36b that connects (connects) the intermediate reference flow path Rb and at least one first flow path 30 of the first small blocks B1a and B2a, and There is a secondary branch path 36b that communicates (connects) the intermediate reference path Rb and at least one first path 30 of the second small blocks B1b, B2b.

  In the present embodiment, each of the first small blocks B1a and B2a and the second small blocks B1b and B2b includes a plurality of first flow paths 30.

  Accordingly, the main body 3 includes connection paths 37a and 37b that connect the adjacent first flow paths 30 to each other in the first small blocks B1a and B2a and the second small blocks B1b and B2b.

  This will be described more specifically. In the present embodiment, each of the pair of secondary branch paths 36b and 36b communicates the intermediate reference flow path Rb and the first flow path 30 adjacent to the intermediate reference flow path Rb. That is, one secondary branch path 36b is the first flow path 30 in the first small blocks B1a and B2a, and communicates with the first flow path 30 adjacent to the intermediate reference flow path Rb. The other secondary branch path 36b is the first flow path 30 in the second small blocks B1b and B2b, and communicates with the first flow path 30 adjacent to the intermediate reference flow path Rb.

  As described above, each of the first small blocks B1a, B2a and the second small blocks B1b, B2b includes a plurality of first flow paths 30,. Accordingly, the main body 3 includes the first small blocks B1a and B2a (on the first large block B1 and the second large block B2 (one end side and the other end side relative to the reference channel Ra in the first direction)). At least one connection path 37a, 37b that connects the first flow paths 30,... On one end side of the intermediate reference flow path Rb in the first direction, and second small blocks B1b, B2b (intermediate reference in the first direction) It has at least one connection path 37a, 37b that connects the first flow paths 30, ... on the other end side with respect to the flow path Rb. That is, the main body 3 includes connection paths 37a and 37b that connect the adjacent first flow paths 30 and 30 to each other in each of the first small blocks B1a and B2a and the second small blocks B1b and B2b.

  In the present embodiment, each of the first small blocks B1a, B2a and the second small blocks B1b, B2b includes four first flow paths 30,. And the main-body part 3 which concerns on this embodiment is two connection paths 37a and 37b which connect the adjacent 1st flow paths 30 and 30 in each of 1st small block B1a, B2a and 2nd small block B1b, B2b. Is provided.

  One connection path (hereinafter referred to as a first connection path) 37a includes a single first flow path 30 that communicates with the secondary branch path 36b, and the side opposite to the intermediate reference flow path Rb with respect to the first flow path 30. And the adjacent first first flow paths (hereinafter referred to as primary-side first flow paths) 30. On the other hand, the other connection path 37 b (hereinafter referred to as the second connection path) 37 b is a primary side first flow path 30 communicating with the first connection path 37 a and an intermediate reference flow with respect to the primary side first flow path 30. The first flow paths 30 and 30 on the opposite side of the path Rb are connected to a plurality of first flow paths (hereinafter referred to as outermost first flow paths) 30 that are larger than the number of reference flow paths Ra. . In the present embodiment, there are three first flow paths 30,... Communicating with the secondary connection path 37 b. And the two 1st flow paths 30 and 30 except the primary side 1st flow path 30 which is one of them are connected with the 1st outflow communication path 33. FIG.

  The first connection path 37a and the second connection path 37b are arranged with an interval in the second direction. In this embodiment, the 1st connection path 37a penetrates the other end part of the heat-transfer plate 2 (heat-transfer part 20) in a 2nd direction. Moreover, the 2nd connection path 37b has penetrated the one end part of the heat-transfer plate 2 (heat-transfer part 20) in a 2nd direction. As a result, in each of the first small blocks B1a and B2a and the second small blocks B1b and B2b, the first fluid A flows from the intermediate reference flow path Rb to the first outflow communication path 33. Each time it moves to the adjacent first flow path 30,..., The flow direction changes in the second direction.

  In the present embodiment, the first inflow communication passage 32 extends from one end in the first direction to the reference channel Ra located in the middle of the first direction, and communicates only with the reference channel Ra.

  On the other hand, the first outflow communication path 33 extends from one end to the other end in the first direction, and is only in the outermost first flow paths 30, 30 of the first small blocks B1a, B2a and the second small blocks B1b, B2b. Communicate. That is, in the present embodiment, the ends of the flow paths of the first fluid A in the first large block B1 and the second large block B2 are plural in the first small blocks B1a and B2a and the second small blocks B1b and B2b, respectively. Of the first flow path 30.

  Accordingly, there are a plurality of first flow paths 30 in each of the first large block B1 and the second large block B2, and the second connection between the intermediate reference flow path Rb and the first outflow communication path 33. The plurality of first flow paths 30,... Communicating with only the path 37 b communicate with the first outflow communication path 33.

  In contrast, each of the second inflow communication passage 34 and the second outflow communication passage 35 extends from one end of the main body 3 to the other end in the first direction. Each of the plurality of second flow paths 31 arranged in the first direction communicates with the second inflow communication path 34 and the second outflow communication path 35.

  Therefore, in the plate heat exchanger 1 of the present embodiment, the flow path of the first fluid A is configured to meander between the first inflow communication path 32 and the first outflow communication path 33. On the other hand, the flow path of the second fluid B is configured straight between the second inflow communication passage 34 and the second outflow communication passage 35.

  As described above, the plate heat exchanger 1 according to the present embodiment includes the main body 3 including the plurality of stacked heat transfer plates 2. The main body 3 includes a first flow path 30 through which the first fluid A flows, a second flow path 31 through which the second fluid B flows, a first inflow communication path 32 that communicates with the first flow path 30, and a first outflow communication. A first inflow communication passage 32 and a first outflow communication passage 33 (a pair of first communication passages 32, 33) that allow the first fluid A to flow into and out of the first flow paths 30,. A second inflow communication path 34 and a second outflow communication path 35 (a pair of second communication paths 34, 35) communicating with the second flow paths 31,. The second inflow communication passage 34 and the second outflow communication passage 35 (a pair of second communication passages 34, 35) for allowing the second fluid B to flow in and out of the first fluid passage 31, are provided. And the 1st flow path 30, ... and the 2nd flow path 31, ... are formed alternately by making the heat-transfer plate 2, ... into a boundary. Each of the first inflow communication passage 32, the first outflow communication passage 33, the second inflow communication passage 34, and the second outflow communication passage 35 extends in the first direction through the heat transfer plates 2,. Yes. Then, the first flow paths 30 communicate with each other to form a flow path of the first fluid A from the first inflow communication path 32 to the first outflow communication path 33. In addition, at least one first flow path 30 among the plurality of first flow paths 30 is a reference flow path Ra that is a starting point of the flow path of the first fluid A. The first inflow communication passage 32 communicates only with the reference channel Ra. The first outflow communication passage 33 is a plurality of first flow passages 30 that are larger than the number of the reference flow passages Ra, and are only in the plurality of first flow passages 30 that are the end of the flow passage of the first fluid A. Communicate.

  As described above, according to the plate heat exchanger 1 according to the present embodiment, the plurality of first series passages 30,... Communicating with the first outflow communication passage 33 is larger than the number of the reference passages Ra. For this reason, the cross-sectional area of the flow path of the first fluid A from the first inflow communication passage 32 to the first outflow communication passage 33 increases as it goes downstream. Thereby, in the plate type heat exchanger 1 of the said structure, the increase in the pressure loss in the whole flow path of the 1st fluid A can be suppressed, and high heat exchange performance can be obtained.

  In the present embodiment, at least one first flow path 30 in the middle of the first direction is a reference flow path Ra that is the starting point of the flow path of the first fluid A. Further, the main body 3 includes at least one first flow path Ra and each of the first large block B1 and the second large block B2 (one end side and the other end side of the reference flow path Ra in the first direction). A pair of primary branch paths 36a, 36a communicating with one flow path 30 is provided. The first outflow communication passage 33 includes the end of the flow path of the first fluid A in each of the first large block B1 and the second large block B2 (one end side and the other end side with respect to the reference flow path Ra in the first direction). The plurality of first flow paths 30 are communicated only with the plurality of first flow paths 30, which are larger than the number of the reference flow paths Ra.

  As described above, in the plate heat exchanger 1 according to the present embodiment, the first inflow communication passage 32 communicates only with the reference flow channel Ra (first flow channel 30) located in the middle of the first direction. For this reason, the 1st inflow communication path 32 is formed only by the middle position in the 1st direction. Thereby, the increase in the pressure loss of the first fluid A in the first inflow communication passage 32 can be further suppressed.

  The pair of primary branch passages 36a and 36a are provided in the reference channel Ra and the first large block B1 and the second large block B2 (one end side and the other end side of the reference channel Ra in the first direction). A certain at least 1 1st flow path 30 is connected. For this reason, in the main body 3, as a flow path of the first fluid A, a system including one primary branch path 36 a communicating with the reference flow path Ra and the other primary branch path 36 a communicating with the reference flow path Ra. Two lines are formed with a line including

  Accordingly, the length of the flow path of the first fluid A from the first inflow communication path 32 to the first outflow communication path 33 (flow path length per system) is shortened. Thereby, in the plate type heat exchanger 1 of the said structure, the increase in the pressure loss in the whole flow path of the 1st fluid A is suppressed more, and high heat exchange performance is obtained.

  In the present embodiment, a plurality of first flow paths 30 are provided in each of the first large block B1 and the second large block B2 (one end side and the other end side with respect to the reference flow path Ra in the first direction). In each of the first large block B1 and the second large block B2 (one end side and the other end side with respect to the reference flow path Ra in the first direction), a midway position in the first direction among the plurality of first flow paths 30,. The first flow path 30 is an intermediate reference flow path Rb that is a branch position of the flow path of the first fluid A. The main body 3 includes at least one first reference block Rb and each of the first large block B1 and the second large block B2 (one end side and the other end side of the intermediate reference flow path Rb in the first direction). A pair of secondary branch passages 36b and 36b for communicating with one flow path 30 is provided. Each of the primary branch paths 36a, 36a communicates with the intermediate reference flow path Rb in each of the first large block B1 and the second large block B2 (one end side and the other end side with respect to the reference flow path Ra in the first direction). doing.

  Accordingly, the primary branch paths 36a and 36a are located in the first direction in the first large block B1 and the second large block B2 (one end side and the other end side from the reference flow path Ra in the first direction). Are communicated only with the intermediate reference channel Rb (first channel 30). Accordingly, in each of the first large block B1 and the second large block B2 (one end side and the other end side with respect to the reference flow path Ra in the first direction), the primary branch paths 36a and 36a reach the midway position in the first direction. It is formed only in For this reason, an increase in the pressure loss of the first fluid A in the primary branch paths 36a, 36a is suppressed.

  And in each of the 1st large block B1 and 2nd large block B2 (one end side and other end side rather than the reference | standard flow path Ra in a 1st direction) of the main-body part 3, it is an intermediate | middle reference | standard as a flow path of the 1st fluid A Two systems are formed: a system including one secondary branch path 36b communicating with the flow path Rb and a system including the other secondary branch path 36b communicating with the intermediate reference flow path Rb.

  Therefore, in each of the first large block B1 and the second large block B2 (one end side and the other end side with respect to the reference flow path Ra in the first direction) of the main body 3, the primary outflow communication path 33 from the primary branch path 36a. The length of the flow path of the first fluid A (flow path length per system) becomes shorter. Thereby, in the plate type heat exchanger 1 of the said structure, the increase in the pressure loss in the whole flow path of the 1st fluid A is suppressed further, and high heat exchange performance is obtained.

  In addition, the first flow path 30,... Includes the first small block B1a, B2a and the second large block B1 and the second large block B2 (one end side and the other end side from the reference flow path Ra in the first direction). A plurality of small blocks B1b and B2b (one end side and the other end side of the intermediate reference flow path Rb in the first direction) are provided. The pair of secondary branch paths 36b and 36b are respectively connected to the first small blocks B1a and B2a and the second small blocks B1b and B2b (one end side and the other end side from the intermediate reference flow path Rb in the first direction). It communicates with a certain first flow path 30. The main body 3 includes first small blocks B1a and B2a (in the first direction) in each of the first large block B1 and the second large block B2 (one end side and the other end side with respect to the reference channel Ra in the first direction). At least one connection path 37a, 37b that connects the first flow paths 30,... Located on one end side of the intermediate reference flow path Rb, and second small blocks B1b, B2b (from the intermediate reference flow path Rb in the first direction). Also has at least one connection path 37a, 37b for connecting the first flow paths 30,. The first outflow communication passage 33 is a single second in each of the first small blocks B1a, B2a and the second small blocks B1b, B2b (one end side and the other end side from the intermediate reference flow path Rb in the first direction). A plurality of first flow paths 30,... That communicate with each other via connection paths (connection paths) 37 b, and only a plurality of first flow paths 30,. Thereby, the heat transfer area can be increased without increasing the flow path length of the first fluid A from the first inflow communication path 32 to the first outflow communication path 33.

  In particular, the main body 3 includes, as connection paths 37a and 37b, a first connection path 37a that communicates with the first flow path 30 that communicates with the secondary branch path 36b and another first flow path 30; It has the 2nd connection path 37b which makes the some 1st flow path 30 including ... the 1st flow path 30 connect. The 1st connection path 37a and the 2nd connection path 37b are arrange | positioned at intervals in the 2nd direction (direction orthogonal to a 1st direction). The first inflow communication path 32 communicates with the first flow paths 30 other than the other first flow path 30 among the plurality of first flow paths 30 connected to the second connection path 37b. Thereby, the flow path of the first fluid A from the reference flow path Ra to the second connection path 37b becomes a meandering flow path. The first fluid A that circulates through the first flow paths 30 that constitute the meandering flow path, and the second fluid B that circulates through the second flow paths 31, adjacent to the first flow paths 30,. The timing of heat exchange with is different. Therefore, as the first fluid A moves from the upstream side to the downstream side, the first fluid A and the second fluid B reliably exchange heat.

  It should be noted that the plate heat exchanger according to the present invention is not limited to the above-described embodiment, and it is needless to say that modifications can be appropriately made without departing from the gist of the present invention.

  In the plate heat exchanger 1 of the above embodiment, the flow path of the first fluid A in the first large block B1 and the flow path of the first fluid A in the second large block B2 are based on the reference flow path Ra. Although it formed symmetrically, it is not limited to this. The flow path of the first fluid A in the first large block B1 and the flow path of the first fluid A in the second large block B2 may be formed in an asymmetric form with respect to the reference flow path Ra. That is, the first large block B1 and the second large block B2 may differ in the number of the first flow paths 30, ..., the arrangement of the intermediate reference flow path Rb, the arrangement of the secondary branch path 36b, and the like.

  In the above embodiment, each of the first large block B1 and the second large block B2 has two small blocks (first small block and second small block) B1a, B2a, B1b, Although divided into B2b, it is not limited to this. For example, all the first flow paths 30 in each of the first large block B1 and the second large block B2 on both sides of the reference flow path Ra may be directly communicated with the first outflow communication path 33. Even in this case, the first outflow communication passage 33 is a plurality of first flow paths 30,... Larger than the number of the reference flow paths Ra, and a plurality of first flows serving as terminal ends of the first fluid A flow paths. It communicates only with the road 30. For this reason, the cross-sectional area of the flow path of the first fluid A from the first inflow communication path 32 to the first outflow communication path 33 increases as it goes downstream. Therefore, in the plate heat exchanger having such a configuration, an increase in pressure loss in the entire flow path of the first fluid A is suppressed as in the above embodiment, and high heat exchange performance is obtained.

  In the above embodiment, in the first small blocks B1a and B2a and the second small blocks B1b and B2b, a single first flow path 30 adjacent to the intermediate reference flow path Rb and another second adjacent to the first flow path 30 are provided. Although the one flow path 30 communicated with the first connection path 37a, the present invention is not limited to this. For example, as shown in FIG. 4, the secondary branch path 36b communicates with the first flow path 30 adjacent to the intermediate reference flow path Rb, and the first connection path 37a communicates with the first flow path 30 communicated with the secondary branch path 36b. , A first group constituted by a plurality of first flow paths 30 including a first flow path 30 adjacent to the first flow path 30, and a plurality of first flow paths 30, which are larger than the number of reference flow paths Ra, Communicate with the first group consisting of. The second connection path 37b is a first group and a second group adjacent to the first group, and a plurality of first channels 30, more than the number of the first channels 30,. The first outflow communication passage 30 may be communicated with a plurality of first flow paths 30,... Constituting the second group.

  Each of the pair of secondary branch paths 36b and 36b includes a first small block B1a and B2a and a second small block B1b and B2b (one end side and the other end side of the intermediate reference channel in the first direction). The main body 30 may have the following configuration on the assumption that the first flow passages 30 are communicated with each other.

  The main body 3 includes first small blocks B1a and B2a (in the first direction) in each of the first large block B1 and the second large block B2 (one end side and the other end side with respect to the reference channel Ra in the first direction). The first flow path 30 that communicates with one of the secondary branch paths 36b (on one end side of the intermediate reference flow path Rb), and another plurality that is larger than the number of the first flow paths 30 that communicate with the secondary branch path 36b. Of the first flow path 30,..., And the second small blocks B 1 b and B 2 b (the other end side of the intermediate reference flow path Rb in the first direction). A first flow path 30 that communicates with the secondary branch path 36b is connected to a plurality of other first flow paths 30 that are larger than the number of first flow paths 30 that communicate with the secondary branch path 36b. Connection path (second connection path) 37b. The first outflow communication passage 33 is located in each of the first small blocks B1a and B2a and the second small blocks B1b and B2b (one end side and the other end side from the intermediate reference flow path Rb in the first direction). The plurality of first flow paths (a plurality of first flow paths communicating only with the second connection path 37b) 30,.

  If it does in this way, the flow path which the group (block) of the 1st flow paths 30, ... connected by the connection paths 37a and 37b connected will be formed. At this time, the number of the first flow paths 30,... Constituting the second group (the group of the first flow paths 30,...) On the downstream side is the first group (first flow path on the upstream side in the flow direction of the first fluid A. The number of first flow paths 30,... Constituting the group of 30,. Thereby, the cross-sectional area of the flow path of the first fluid A from the first inflow communication path 32 to the first outflow communication path 33 increases stepwise, and as a result, the cross-sectional area of the flow path of the first fluid A suddenly increases. It doesn't get bigger. Therefore, even if the number of the first flow paths 30 is increased by increasing the number of the heat transfer plates 2, ... (even if the heat transfer area contributing to heat exchange in the entire main body 3 is increased), Smooth flow of the first fluid A can be ensured while suppressing an increase in pressure loss in the flow path.

  In the above embodiment, the first large block B1 and the second large block B2 are only divided into the first small blocks B1a and B2a and the second small blocks B1b and B2b, but are not limited thereto. For example, the first small blocks B1a and B2a and the second small blocks B1b and B2b may be partitioned into smaller blocks. However, also in this case, the first outflow communication path 33 is a plurality of first flow paths 30,... Larger than the number of the reference flow paths Ra, and the flow path of the first fluid A within the subdivided blocks. Are communicated only with the plurality of first flow paths 30,.

  In the said embodiment, the flow path of the 1st fluid A turns into a meandering flow path by connecting the 1st flow path 30 continuously in each of 1st small block B1a, B2a and 2nd small block B1b, B2b. However, it is not limited to this. For example, each of the first small blocks B1a and B2a and the second small blocks B1b and B2b includes a plurality of first flow paths 30. All of the plurality of first flow paths 30 may communicate with the secondary branch paths 36 b and 36 b and with the first outflow communication path 33. In this way, the first fluid A flows from the secondary branch passages 36 b and 36 b into the plurality of first flow paths 30,..., And flows through the plurality of first flow paths 30 to the first outflow communication path 33. leak. Thus, since the first fluid A circulates through the plurality of first flow paths 30, a large heat transfer area is ensured without extending the flow path length of the first fluid A, thereby improving the heat exchange performance. Become.

  Although the main-body part 3 of the said embodiment has a pair of primary branch paths 36a and 36a, it is not limited to this structure. The main body 3 may have two or more pairs of primary branch paths 36a. That is, the main body 3 includes at least a pair of primary branch paths 36a. What is necessary is just to have 36a.

  In this case, each of the second pair of primary branch paths 36a and 36a has a reference flow path Ra that is more than the area (first area) where the flow path of the first fluid A starts from the first pair of primary branch paths 36a and 36a. However, it communicates only with the primary flow path 30 in the outer region (second region). Then, the flow path of the first fluid A starting from the primary branch path (one primary branch path of the second pair of primary branch paths 36a, 36a) 36a on one end side of the reference flow path Ra in the first direction. , And a primary branch path on the other end side of the reference flow path Ra in the first direction (the other primary branch of the second pair of primary branch paths 36a and 36a). Each of the plurality of first flow paths 30,..., Which ends in the flow path of the first fluid A starting from the path 36 a, communicates with the first outflow communication path 33. At this time, the flow of the first fluid A starting from the primary branch path (one primary branch path of the second pair of primary branch paths 36a, 36a) 36a on one end side of the reference flow path Ra in the first direction. And a first fluid A starting from a primary branch path (the other primary branch path of the second pair of primary branch paths 36a, 36a) 36a on the other end side of the reference path Ra in the first direction. These flow paths are all arranged in the second region. Further, in the first fluid A flow path starting from the second pair of primary branch paths 36a, 36a, the number of the first flow paths 30,... There are many.

  That is, the n (natural number) paired primary branch passages 36a and 36a communicate with only the first flow path 30 in the region (nth region) outside the n-1 region in the main body 3, and the nth pair. The first fluid A may be provided in the nth region starting from the primary branch passages 36a, 36a.

  In the above embodiment, each of the plurality of second flow paths 31,... Communicates with the second inflow communication path 34 and the second outflow communication path 35, and the second inflow communication path 34 and the second outflow communication path 35 are connected to each other. The flow path of the second fluid B to be connected is configured straight, but is not limited thereto. For example, the flow path of the second fluid B connecting the second inflow communication path 34 and the second outflow communication path 35 may be formed to meander in the same manner as the flow path of the first fluid A. That is, the flow path of the second fluid B branches at least once on each of the one end side and the other end side of the main body 3 in the first direction, like the flow path of the first fluid A, and the second outflow communication path 35 is the second flow path 31 on each of the one end side and the other end side of the main body 3 in the first direction, and only in the second flow path 31 serving as the end of the flow path through which the second fluid B flows. You may communicate. Even in this case, a flow path that is a branch position of the flow path of the second fluid B is set, and the flow path of the second fluid B is divided into two or more blocks by dividing the flow path into subdivided blocks. You may make it make it.

  DESCRIPTION OF SYMBOLS 1 ... Plate type heat exchanger, 2 ... Heat transfer plate, 3 ... Main-body part, 4 ... 1st end plate (end plate), 5 ... 2nd end plate (end plate), 20 ... Heat transfer part, 21 ... Fit 30 ... first flow path, 31 ... second flow path, 32 ... first inflow communication path (one first series path), 33 ... first outflow communication path (the other first series path), 34 ... Second inflow communication path (one second communication path), 35 ... second outflow communication path (the other second communication path), 36a ... primary branch path, 36b ... secondary branch path, 36c ... tertiary branch path, 37a ... 1st connection path (connection path), 37b ... 2nd connection path (connection path), 40, 50 ... Sealing part, 41, 51 ... Fitting part, A ... 1st fluid, B ... 2nd fluid, B1 ... first large block (block), B2 ... second large block (block), B1a, B2a ... first small block (block), 1b, B2b ... second small block (Block), B1a, B2a ... first small block (Block), Ra ... reference channel, Rb ... intermediate reference channel

Claims (6)

The main body includes a plurality of stacked heat transfer plates, and the main body includes a plurality of first flow paths for flowing the first fluid, a plurality of second flow paths for flowing the second fluid, and a first flow path. A pair of first communication passages that communicate with each other, a pair of first communication passages that allow the first fluid to flow into and out of the first flow passage, and a pair of second communication passages that communicate with the second flow passage, A pair of second communication passages for allowing the second fluid to flow into and out of the flow path, wherein the first flow path and the second flow path are alternately formed with the heat transfer plate as a boundary. In the plate heat exchanger in which each of the communication passages extends through the heat transfer plate in the stacking direction of the heat transfer plate,
The first flow paths communicate with each other to form a flow path of the first fluid from one first series path to the other first series path,
At least one first channel of the plurality of first channels is a reference channel that is a starting point of the first fluid channel,
One first series passage communicates only with the reference flow path,
The other first series passage is a plurality of first flow paths larger than the number of reference flow paths, and is communicated only with a plurality of first flow paths that are terminal ends of the first fluid flow path. Plate heat exchanger. At least one first flow path at a midpoint in the stacking direction of the heat transfer plates is a reference flow path that is a starting point of the flow path of the first fluid,
The main body has at least a pair of primary branch passages that communicate with at least one first flow path on each of one end side and the other end side of the reference flow path and the reference flow path in the stacking direction of the heat transfer plates,
The other first series passage is a plurality of first flow paths that are ends of the flow paths of the first fluid on each of the one end side and the other end side of the reference flow path in the stacking direction of the heat transfer plates. The plate-type heat exchanger according to claim 1, wherein the plate-type heat exchanger communicates with only a plurality of first flow paths larger than the number of paths. A plurality of first flow paths are provided on each of one end side and the other end side of the reference flow path in the stacking direction of the heat transfer plates,
In each of the one end side and the other end side of the reference flow path in the stacking direction of the heat transfer plates, the first flow path located in the middle of the heat transfer plate stacking direction among the plurality of first flow paths is the first fluid. It is an intermediate reference channel that is the branching position of the channel,
The main body has a pair of secondary branch passages that connect the intermediate reference flow path and at least one first flow path on each of one end side and the other end side of the intermediate reference flow path in the stacking direction of the heat transfer plates. Have
3. The plate heat exchanger according to claim 2, wherein each of the primary branch passages communicates with an intermediate reference channel on each of one end side and the other end side of the reference channel in the stacking direction of the heat transfer plates. There are a plurality of first flow paths on one end side and the other end side of the intermediate flow path in the stacking direction of the heat transfer plate, respectively on one end side and the other end side of the reference flow path in the stacking direction of the heat transfer plate. Provided,
Each of the pair of secondary branch paths communicates with one first flow path on each of the one end side and the other end side of the intermediate reference flow path in the stacking direction of the heat transfer plates,
The main body portion connects the first flow paths on one end side with respect to the intermediate reference flow path in the stacking direction of the heat transfer plates on each of the one end side and the other end side with respect to the reference flow path in the stacking direction of the heat transfer plates. Having at least one connection path, and at least one connection path connecting the first flow paths on the other end side with respect to the intermediate reference flow path in the stacking direction of the heat transfer plates;
The other first series passage is a plurality of first passages communicating with each other through a single connection path on each of the one end side and the other end side of the intermediate reference passage in the stacking direction of the heat transfer plates, The plate-type heat exchanger according to claim 3, wherein the plate-type heat exchanger communicates with only a plurality of first flow paths larger than the number of flow paths. The main body communicates as a connection path a first connection path that communicates with the first flow path communicating with the secondary branch path and another first flow path, and a plurality of first flow paths including the other first flow path. A second connection path,
The first connection path and the second connection path are arranged at intervals in a direction orthogonal to the stacking direction of the heat transfer plates,
The plate-type heat exchange according to claim 4, wherein the other first series passage communicates with a first passage other than the other first passage among the plurality of first passages connected to the second connection passage. vessel. There are a plurality of first flow paths on one end side and the other end side of the intermediate flow path in the stacking direction of the heat transfer plate, respectively on one end side and the other end side of the reference flow path in the stacking direction of the heat transfer plate. Provided,
Each of the pair of secondary branch passages communicates with a plurality of first flow paths on one end side and the other end side of the intermediate reference flow path in the stacking direction of the heat transfer plates,
The main body communicates with one of the secondary branch paths at one end side of the intermediate reference flow path in the stacking direction of the heat transfer plate at each of the one end side and the other end side from the reference flow path in the stacking direction of the heat transfer plate. And a connection path that connects a plurality of other first flow paths larger than the number of the first series passages that communicate with the secondary flow path,
The first flow path communicating with the other secondary branch path on the other end side of the intermediate reference flow path in the stacking direction of the heat transfer plates, and another number greater than the number of first series paths communicating with the secondary branch path A connection path connecting a plurality of first flow paths,
The other first series passage communicates with only the plurality of other first flow paths on one end side and the other end side of the intermediate reference flow path in the stacking direction of the heat transfer plates. Plate heat exchanger.

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