JP5933605B2 - Plate heat exchanger - Google Patents

Description

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

  Conventionally, plate-type heat exchangers have been widely used as heat exchangers used for evaporators that evaporate the first fluid and condensers that condense the first fluid in association with heat exchange between the first fluid and the second fluid. (For example, refer to 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 for flowing the first fluid A, a second flow path 31 for flowing the second fluid B, and a pair of first series passages 32 and 33 communicating with the first flow path 30. A pair of first communication passages 32 and 33 that allow the first fluid A to flow into and out of the first flow path 30 and a pair of second communication paths 34 and 35 that communicate with the second flow path 31, The passage 31 has a pair of second communication passages 34 and 35 through which the second fluid B flows in and out.

  This will be described more specifically. The plurality of heat transfer plates 2, ... have at least four openings (not numbered). And in the main-body part 3, 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 heat-transferred by laminating | stacking several heat-transfer plates 2, .... It is formed alternately with the plates 2. Further, by stacking the plurality of heat transfer plates 2,..., The opening formed in the heat transfer plate 2 is continuous in the stacking direction of the plurality of heat transfer plates 2,. One of the second series passages 32 that allows the first fluid A to flow out from the first flow path 30 and one second that allows the second fluid B to flow into the second flow path 31. The communication path 34 and the other second communication path 35 for allowing the second fluid B to flow out from the second flow path 31 pass through the heat transfer plates 2,... In the stacking direction of the plurality of heat transfer plates 2,. It is formed to extend.

  Thereby, in this type of plate heat exchanger 1, the first fluid A supplied to one first series passage 32 flows out through the first flow path 30 to the other first series passage 33, The second fluid B supplied to the second communication passage 34 flows out to the other second communication passage 35 through the second flow path 31. And as above-mentioned, the plate-type heat exchanger 1 distribute | circulates the 1st fluid A through the 1st flow path 30, and the 2nd fluid B distribute | circulates the 2nd flow path 31. The first fluid A and the second fluid B exchange heat through a wide heat transfer surface of the heat transfer plate 2 that partitions the second flow path 31.

JP-A-11-287572

  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 depending on the number of plates 2.

  That is, each of the pair of first series passages 32 and 33 and the pair of second communication passages 34 and 35 is formed by connecting the openings of the heat transfer plates 2. If the number of... Increases, the channel length becomes longer according to the number.

  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 of the first fluid A into the first flow path 30 on the inlet side of the one first series passage 32 and the second on the back side of the one first series path 32. The inflow of the first fluid A into the one flow path 30 becomes uneven.

  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.

  Therefore, the present invention 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. It is an object of the present invention to provide a plate heat exchanger that can efficiently perform heat exchange with two fluids.

  The plate heat exchanger according to the present invention includes a main body including a plurality of stacked heat transfer plates, and the main body includes a first flow path for flowing the first fluid and a second flow for flowing the second fluid. A pair of first passages communicating with the first passage and a pair of second passages communicating with the second passage; and a pair of second passages communicating with the second passage. A communication path having a pair of second communication paths for allowing the second fluid to flow into and out of the second flow path, the first flow path and the second flow path being alternately formed with the heat transfer plate as a boundary, In the plate type 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. A flow path of the first fluid from the series passage to the other first series passage is formed, and the stacking direction is The predetermined first flow path in the middle position is a primary reference flow path that becomes a branch position of the flow path of the first fluid, and the second flow paths communicate with each other so that one second communication path is connected to the other second communication path. To the primary reference flow path, the second flow path adjacent to the primary reference flow path via the heat transfer plate is the primary adjacent flow path, and the main body portion has the primary reference flow At least a pair of primary branch passages that connect the passage and at least one first flow path on each of one end side and the other end side of the primary reference flow path in the stacking direction, a primary adjacent flow path, and a primary in the stacking direction A pair of primary connection paths for communicating with at least one second flow path on each of the one end side and the other end side relative to the adjacent flow path, and connected to one second communication path via the primary adjacent flow path A pair of primary connection paths, wherein one of the first series passages is The other first series passage communicates only with the primary reference flow path, and the other first series passage is a first flow path on one end side and the other end side with respect to the primary reference flow path in the stacking direction, and is a terminal end of the first fluid flow path The second communication path communicates only with the primary adjacent flow path, and the other second communication path has one end side and the other end with respect to the primary adjacent flow path in the stacking direction. It is the 2nd flow path in the side, Comprising: It communicates only with the 2nd flow path used as the terminal of the flow path of the 2nd fluid, It is characterized by the above-mentioned.

  According to the plate heat exchanger having the above-described configuration, one of the first series passages communicates only with a primary reference channel (predetermined first channel) located at an intermediate position in the stacking direction of the heat transfer plates. Accordingly, one of the first series passages is formed only up to a midpoint in the stacking direction of the heat transfer plates, so that an increase in the pressure loss of the first fluid in the one first series passage can be suppressed.

  And at least a pair of primary branch passages communicate with at least one first flow path on each of one end side and the other end side of the primary reference flow path and the primary reference flow path in the stacking direction of the heat transfer plate, In the main body, there are two systems, a system including one primary branch channel communicating with the primary reference channel and a system including the other primary branch channel communicating with the primary reference channel as the first fluid channel. It is formed.

  Therefore, the length of the flow path of the first fluid from one first series path to the other first series path (the length of the channel per system) is shortened. Thereby, in the plate type heat exchanger of the said structure, the increase in the pressure loss in the whole flow path of a 1st fluid can be suppressed, and high heat exchange performance can be obtained.

  Furthermore, in the plate heat exchanger having the above-described configuration, the pressure acting on the first fluid flowing on one first series passage side (start end side) in the first fluid flow path is the other pressure in the first fluid flow path. The pressure is higher than the pressure acting on the first fluid flowing on the first series passage side (terminal side). Therefore, the temperature of the first fluid flowing through one first series passage in the first fluid flow path is higher than that of the first fluid flowing through the other first series passage in the first fluid flow path.

  In the plate heat exchanger having the above-described configuration, the second flow path adjacent to the primary reference flow path via the heat transfer plate is used as the primary adjacent flow path, and one of the second communication paths is used only as the primary adjacent flow path. In order to communicate, heat exchange can be performed between the first fluid flowing upstream in the flow path of the first fluid and the second fluid flowing upstream in the flow path of the second fluid. That is, heat exchange can be performed between the first fluid and the second fluid at the stage where the amount of heat (temperature) starts to change due to heat exchange.

  Thereby, it is possible to avoid the temperature of the first fluid flowing upstream in the flow path of the first fluid from approaching the temperature of the second fluid flowing upstream in the flow path of the second fluid. The amount of heat of the fluid can be effectively used for heat exchange with the first fluid. Therefore, heat exchange performance can be improved.

  Moreover, as one aspect of the present invention, three or more first flow paths are provided on each of the one end side and the other end side of the primary 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 primary reference flow path in the stacking direction, the first flow path in the middle of the stacking direction among the three or more first flow paths is a branch of the flow path of the first fluid. The secondary reference flow path is a position, and in the second fluid flow path, the second flow path adjacent to the secondary reference flow path via the heat transfer plate is the secondary adjacent flow path, and the main body portion is A secondary reference channel and at least a pair of secondary branch channels that communicate with at least one first channel on each of one end side and the other end side of the secondary reference channel in the stacking direction, Each of the secondary branches is the primary reference flow in the stacking direction of the heat transfer plates. It communicates with the secondary reference channel in each of one end and the other end than the primary connection path may be connected to the primary adjacent channel and the secondary adjacent channel.

  In this way, the primary branch path is a secondary reference flow path located in the middle of the heat transfer plate stacking direction on each of the one end side and the other end side of the primary reference flow path in the heat transfer plate stacking direction. It communicates only with the (predetermined first flow path). Therefore, since the primary branch path is formed only up to the middle position in the stacking direction of the heat transfer plates on each of the one end side and the other end side of the primary reference flow path in the stacking direction of the heat transfer plate, An increase in pressure loss of the first fluid can be suppressed.

  Then, one secondary branch channel communicating with the secondary reference channel as the first fluid channel on each of the one end side and the other end side of the primary reference channel in the stacking direction of the heat transfer plates of the main body portion And a system including the other secondary branch that communicates with the secondary reference channel. Therefore, the length of the flow path of the first fluid from the primary branch path to the other first series path on each of the one end side and the other end side of the primary reference flow path in the stacking direction of the heat transfer plates of the main body. The length (flow path length per system) is shortened. Thereby, in the plate type heat exchanger of the said structure, the increase in the pressure loss in the whole flow path of a 1st fluid can be suppressed, and high heat exchange performance can be obtained.

  Further, the plate heat exchanger having the above-described configuration has a second adjacent flow path that is adjacent to the secondary reference flow path via the heat transfer plate as a secondary adjacent flow path, and the primary adjacent flow path and the secondary adjacent flow path are Connect with primary connection. That is, in the plate type heat exchanger, the second fluid that flows in the primary adjacent flow path with respect to the first flow path in which the first fluid in which the temperature change due to heat exchange is small next to the first fluid that flows in the primary reference flow path. Next, the second flow path through which the second fluid having a small temperature change due to heat exchange flows is made adjacent.

  Thereby, it can avoid that the 1st fluid which flows through a secondary reference channel and the temperature of the 2nd fluid heat-exchanged with this 1st fluid approach, and the calorie | heat amount of a 2nd fluid is made into 1st fluid. It can be used effectively for heat exchange. Therefore, heat exchange performance can be improved.

  As another aspect of the present invention, the primary adjacent flow path may include a second flow path that is adjacent to the first flow path that is the end of the flow path of the first fluid via a heat transfer plate.

  If it does in this way, the 1st fluid which flows through the 1st channel used as the end of the channel of the 1st fluid and the 2nd fluid which starts heat exchange can be heat-exchanged. Therefore, it is possible to avoid the temperature of the first fluid flowing through the first flow path that is the end of the flow path of the first fluid approaching the temperature of the second fluid that exchanges heat with the first fluid. The amount of heat of the two fluids can be effectively used for heat exchange with the first fluid. Therefore, heat exchange performance can be improved.

  As described above, according to the plate heat exchanger of the present invention, the first fluid is evenly distributed to the plurality of first channels while suppressing an increase in pressure loss in the plurality of first channels through which the first fluid flows. The excellent effect that it can supply and heat exchange with a 1st fluid and a 2nd fluid can be performed efficiently can be show | played.

FIG. 1 is a schematic overall perspective view of a plate heat exchanger according to an embodiment of the present invention, and is a schematic overall perspective view of a plate heat exchanger viewed from one end plate side. FIG. 2 is a schematic overall perspective view of the plate heat exchanger according to the embodiment, and is a schematic overall perspective view of the plate heat exchanger as viewed from the other end plate side. FIG. 3 is a schematic exploded perspective view of the plate heat exchanger according to the embodiment, and is a schematic exploded perspective view of one end side in the first direction. FIG. 4 is a schematic exploded perspective view of the plate heat exchanger according to the embodiment, and is a schematic exploded perspective view of the other end side in the first direction. FIG. 5 is a schematic diagram for explaining the flow paths of the first fluid and the second fluid of the plate heat exchanger according to the embodiment. FIG. 6 is a schematic diagram for explaining the flow paths of the first fluid and 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 and FIG.2, the plate-type heat exchanger 1 is provided with the main-body part 3 containing the several heat-transfer plate 2 ... laminated | stacked. The plate heat exchanger 1 includes a pair of end plates 4 and 5 that sandwich the main body 3.

  As shown in FIGS. 3, 4, and 5, the main body 3 includes a first flow path 30 for flowing the first fluid A, a second flow path 31 for flowing the second fluid B, and the first flow path 30. A pair of first passages 32, 33 that communicate with the first passage 30, and a pair of first passages 32, 33 that allow the first fluid A to flow into and out of the first passage 30 and a pair of passages that communicate with the second passage 31. The second communication passages 34 and 35 have a pair of second communication passages 34 and 35 that 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”, and the other of the pair of first series passages 32 and 33 is the other. The first series passage 33 is referred to as a “first outflow communication passage”. Also, one of the pair of second communication passages 34 and 35 is referred to as a “second inflow communication passage”, and the other of the pair of second communication passages 34 and 35 is the other second communication passage 35. Is the “second outflow communication passage”.

  As described above, each of the plurality of heat transfer plates 2 is stacked on each other. Therefore, the first flow path 30 and the second flow path 31 are alternately formed with the heat transfer plate 2 as a boundary. Further, each of the first series passages 32 and 33 and the second communication passages 34 and 35 is formed so as to penetrate the heat transfer plate 2 and extend in the stacking direction of the heat transfer plate 2.

  In the plate heat exchanger 1, the first flow paths 30 communicate with each other to form a flow path for the first fluid A from the first inflow communication path 32 to the first outflow communication path 33. The passages 31 communicate with each other to form a flow path of the second fluid B from the second inflow communication passage 34 to the second outflow communication passage 35.

  Each of the plurality of heat transfer plates 2,... Is formed by press-molding a metal plate as shown in FIGS. 3 and 4, and the heat transfer section 20 that defines the first flow path 30 and the second flow path 31. An annular fitting portion 21 extending from the outer periphery of the heat transfer section 20 in a direction intersecting the heat transfer section 20 is provided.

  The heat transfer section 20 of each heat transfer plate 2 is formed in a rectangular shape in plan view. In each of the heat transfer plates 2..., A plurality of unillustrated recesses and protrusions are alternately formed on the front and back of the heat transfer section 20. And in the heat-transfer part 20 of each heat-transfer plate 2, ..., the opening for forming 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 (Not numbered) is formed.

  The plate heat exchanger 1 according to this embodiment includes a plurality of types of heat transfer plates 2. This will be described more specifically. In addition to the openings for forming 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, the plate heat exchanger 1 An opening (only an opening for forming a primary branch path 36a, a secondary branch path 36b, and a primary flow path 37a, a secondary flow path 37b, and a tertiary flow path 37c, which will be described later), and a second flow path Heat transfer plates 2,... Having openings (openings for forming a primary connection path 38a and a secondary connection path 38b described later) for connecting only 31 to each other are provided.

  In the present embodiment, descriptions on the number, arrangement, and size of the openings formed in each heat transfer plate 2 are omitted.

  The main body 3 is formed by stacking a plurality of heat transfer plates 2. Therefore, in the main-body part 3, while the protrusions of the heat-transfer part 20 of adjacent heat-transfer plate 2, ... cross-abut, the fitting parts 21 of adjacent heat-transfer plate 2, ... fit. And in the main-body part 3, the intimate part with the adjacent heat-transfer plates 2, ... is sealed by brazing, and the main-body part 3 is formed.

  In the main body 3, the first flow path 30 for flowing the first fluid A, such as chlorofluorocarbon and ammonia, and the liquid second fluid B such as water and brine are circulated with the heat transfer plates 2,. The second flow paths 31 to be made are alternately formed.

  Further, in the main body 3, the openings of the plurality of heat transfer plates 2 are connected, and 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 is provided. Is formed extending in the first direction.

  The first inflow communication passage 32 is 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). The first outflow communication passage 33 is provided on the other end side of the heat transfer plates 2 in the second direction.

  The second inflow communication passage 34 is provided on the other end side of the heat transfer plates 2 in the second direction. The second outflow communication passage 35 is provided on one end side of the heat transfer plates 2 in the second direction.

  In FIG. 5, for the sake of convenience, 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 are illustrated so as to be arranged in the second direction. 3 and 4, the first inflow communication passage 32 and the second outflow communication passage 35 are short in the heat transfer section 20 (directions orthogonal to the first direction and the second direction: The first outflow communication passage 33 and the second inflow communication passage 34 are provided side by side in the third direction of the heat transfer section 20.

  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. That is, the end plates 4 and 5 are formed by sealing portions 40 and 50 formed substantially in the same shape as the heat transfer portion 20 and the entire outer periphery of the sealing portions 40 and 50 in a direction crossing the sealing portions 40 and 50. And annular fitting portions 41 and 51 extending from the circumference.

  One end plate (hereinafter referred to as a first end plate) 4 is an opening formed in adjacent heat transfer plates 2,..., And forms a first inflow communication path 32 and a first outflow communication path 33. And an opening corresponding to the opening (not numbered). That is, the first end plate 4 is provided with openings at two locations of the sealing portion 40. 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 (see FIG. 1). ).

  On the other hand, the other end plate (hereinafter referred to as the second end plate) 5 is an opening formed in the adjacent heat transfer plates 2,. An opening (not numbered) corresponding to the opening for forming the passage 35 is provided. That is, the second end plate 5 has openings at two locations on the sealing portion 50. Accordingly, cylindrical nozzles (not numbered) for connecting pipes are connected to the outer surface of the sealing portion 50 of the second end plate 5 in an arrangement corresponding to each opening (see FIG. 2). ).

  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. Along with this, close portions of the first end plate 4 and the second end plate 5 and the adjacent heat transfer plates 2,... (Main body portion 3) are sealed by brazing.

  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.

  As shown in FIG. 5, in the main body portion 3, a predetermined first flow path 30 (a single first flow path 30 at the center position in the first direction) located at a midway position in the first direction is a flow of the first fluid A. The primary reference flow path Ra serving as a branching position of the road is used. The primary reference flow path Ra is the starting point of the flow path of the first fluid A from the first inflow communication path 32 to the first outflow communication path 33.

  Accordingly, the main body 3 communicates (connects) the primary reference flow path Ra and at least one first flow path 30 located on one end side in the first direction with respect to the primary reference flow path Ra, and the primary reference flow path At least a pair (in this embodiment, a pair) of primary branch paths 36a, 36a communicating the path Ra and at least one first flow path 30 located on the other end side in the first direction with respect to the primary reference flow path Ra. .

  In the main body 3, only the primary reference channel Ra among the first channels 30 communicates with the first inflow communication channel 32. That is, the first inflow communication passage 32 communicates only with the primary reference channel Ra. On the other hand, the first outflow communication passage 33 is a plurality of first flow paths 30 that are larger than the number of primary reference flow paths Ra, and is a first fluid A that is formed starting from the primary reference flow path Ra. It communicates only with the plurality of first flow paths 30, which are the end of the flow path.

  One primary branch path 30a communicates the primary reference channel Ra with at least one first channel 30 located on one end side in the first direction with respect to the primary reference channel Ra. The other primary branch channel 30a communicates the primary reference channel Ra with at least one first channel 30 located on the other end side in the first direction with respect to the primary reference channel Ra. Further, the pair of primary branch paths 36a, 36a are provided so as to penetrate the central portion of the heat transfer section 20 in the second direction.

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

  And in the main-body part 3, the 1st flow path 30 in the middle position (center position in this embodiment) of each of 1st large block B1 and 2nd large block B2 is the flow path of the 1st fluid A. The secondary reference flow path Rb is a branch position.

  Accordingly, each of the first large block B1 and the second large block B2 is a block on one end side in the first direction (hereinafter referred to as a first small block) B1a, B2a with the secondary reference flow path Rb as a boundary. And a block on the other end side in the first direction (hereinafter referred to as a second small block) B1b and B2b with the secondary reference flow path Rb as a boundary.

  The pair of primary branch paths 36a, 36a communicates with the secondary reference channel Rb. This will be described more specifically. One primary branch path 36a passes through the first small block B1b in the first large block B1 and communicates with the secondary reference flow path Rb of the first large block B1. The other primary branch path 36a passes through the second small block B2a in the second large block B2 and communicates with the secondary reference flow path Rb of the second large block B2.

  Furthermore, the main body 3 communicates the secondary reference flow path Rb with at least one first flow path 30 on each of one end side and the other end side in the first direction with respect to the secondary reference flow path Rb ( At least a pair (in this embodiment, a pair) of secondary branch paths 36b and 36b are connected. In the present embodiment, each of the pair of secondary branch paths 36b and 36b communicates the secondary reference flow path Rb and the first flow path 30 adjacent to the secondary reference flow path Rb.

  That is, one of the secondary branch paths 36b is the secondary reference flow path Rb of the first large block B1 and the first flow path 30 of the first small blocks B1a and B2a, with respect to the secondary reference flow path Rb. Thus, the adjacent first flow paths 30 are communicated with each other via the heat transfer plate 2. The other secondary branch path 36b is the secondary reference flow path Rb of the second large block B2 and the first flow path 30 of the second small blocks B2a and B2b, and is connected to the secondary reference flow path Rb. Thus, the adjacent first flow paths 30 are communicated with each other via the heat transfer plate 2.

  Furthermore, the main body 3 has flow passages 37a, 37b, and 37c that allow the adjacent first flow paths 30 to communicate with each other in each of the first small blocks B1a and B1b and the second small blocks B2a and B2b.

A flow path 37a (hereinafter referred to as a primary flow path 37a) in the first small block B1a and the second small block B2a includes a single first flow path 30 communicating with the secondary branch path 36b, and the first flow path 30. On the other hand, a single first flow path 30 adjacent on the side opposite to the secondary reference flow path Rb side is communicated.

  A flow passage 37a (hereinafter referred to as a primary flow passage 37a) in the first small block B1b and the second small block B2b includes a single first flow passage 30 communicating with the secondary branch passage 36b, and the first flow The single first flow path 30 adjacent to the path 30 on the side opposite to the secondary reference flow path Rb is communicated.

  A flow path 37b (hereinafter referred to as a secondary flow path 37b) in the first small block B1a and the second small block B2a is connected to the first flow path 30 communicating with the secondary reference flow path Rb via the primary flow path 37a. The single first flow path 30 adjacent to the first flow path 30 on the side opposite to the secondary reference flow path Rb side is communicated.

  A flow path 37b (hereinafter referred to as a secondary flow path 37b) in the first small block B1b and the second small block B2b is a first flow path that communicates with the secondary reference flow path Rb via the primary flow path 37a. 30 and a single first flow path 30 adjacent to the first flow path 30 on the side opposite to the secondary reference flow path Rb side.

  A flow passage 37c (hereinafter referred to as a tertiary flow passage 37c) in the first small block B1a and the second small block B2a includes a first flow passage 30 communicating with the primary flow passage 37a and the secondary flow passage 37b, The first flow path 30 (in the present embodiment, two first flow paths 30 and 30) on the opposite side of the secondary flow path Rb side with respect to the single flow path 30 is communicated.

  And the flow path 37c (henceforth the tertiary flow path 37c) in 1st small block B1b and 2nd small block B2b, The 1st flow path 30 connected to the primary flow path 37a and the secondary flow path 37b, The first flow path 30 is connected to the first flow path 30 (in the present embodiment, the two first flow paths 30, 30) on the side opposite to the secondary reference flow path Rb side.

  Each primary flow passage 37a, each secondary flow passage 37b, and each tertiary flow passage 37c are arranged at intervals in the second direction. Each primary flow passage 37a and each tertiary flow passage 37c pass through one end of the heat transfer plate 2 (heat transfer section 20) in the second direction, and each secondary flow passage 37b has a heat transfer in the second direction. It penetrates the other end of the plate 2 (heat transfer part 20). Therefore, the flow path of the first fluid A is a meandering flow path that switches the flow direction in the second direction.

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

  On the other hand, the first outflow communication passage 33 extends from one end to the other end in the first direction. And in the 1st large block B1 and the 2nd large block B2, the 1st outflow communication path 33 exists in the two 1st flow paths 30 and 30 in the one end side of a 1st direction, and the other end side of a 1st direction. The two first flow paths 30 and 30 communicate with each other. That is, eight first flow paths 30,... Communicate with the first outflow communication path 33. Thus, in the first embodiment, the end of the flow path of the first fluid A in the first large block B1 and the second large block B2 communicates with the first outflow communication passage 33.

  Next, the flow path (distribution system) of the second fluid B from the second inflow communication path 34 to the second outflow communication path 35 will be specifically described.

  In the plate heat exchanger 1, the second flow path 31 adjacent to the primary reference flow path Ra via the heat transfer plate 2 (heat transfer section 20) is the primary adjacent flow path Sa. In the plate heat exchanger 1 according to the present embodiment, the primary adjacent flow path Sa is added to the second flow path 31 adjacent to the primary reference flow path Ra via the heat transfer plate 2 (heat transfer section 20). Thus, the second flow path 31 that is adjacent to the first flow path 30 that is the end of the flow path of the second fluid B via the heat transfer plate 2 (heat transfer section 20) is included.

  This will be described more specifically. The primary adjacent flow path Sa includes a pair of second flow paths 31 and 31 on both sides of the primary reference flow path Ra in the first direction.

  The primary adjacent flow path Sa is a pair of second adjacent adjacent one ends in the first direction with respect to each of the two first flow paths 30 and 30 communicating with the first outflow communication path 33 in the first small block B1a. The first flow path 30 is included between the two first flow paths 30 and 30 that include the flow paths 31 and 31 and communicate with the first outflow communication passage 33 in the first small block B1b.

  The primary adjacent channel Sa includes a second channel 31 between the two first channels 30 and 30 communicating with the first outflow communication channel 33 in the second small block B2a. A pair of first flow paths 30, 30 adjacent to each of the two first flow paths 30, 30 communicating with the first outflow communication path 33 on the other end side in the first direction are included.

  That is, the eight adjacent second flow paths 31 are included in the primary adjacent flow path Sa. Thereby, in the plate heat exchanger 1, the first fluid A that flows through the most upstream side of the first fluid A that flows through the flow path of the first fluid A, and the second fluid that flows through the flow path of the second fluid B. Heat exchange is performed with the second fluid B flowing in the most upstream side of B. Further, in the plate heat exchanger 1, the first fluid A flowing through the first flow path 30 communicating with the first outflow communication path 33 of the first fluid A flowing through the flow path of the first fluid A, and the second fluid Heat exchange is performed between the second fluid B flowing through the flow path B and the second fluid B flowing most upstream.

  Further, in the plate heat exchanger 1, the second flow path 31 adjacent to the secondary reference flow path Rb via the heat transfer plate 2 (heat transfer section 20) is set as the secondary adjacent flow path Sb.

  Further, the secondary adjacent flow path Sb is the first small block B1a with respect to the first flow path 30 on the primary reference flow path Ra side in the first flow path 30 communicating with the first outflow communication path 33. The second flow path 31 which adjoins via the heat-transfer plate 2 (heat-transfer part 20) by the other end side in a direction is included.

  The secondary adjacent flow path Sb is in the first small block B1b with respect to the first flow path 30 on the side opposite to the primary reference flow path Ra side in the first flow path 30 communicating with the first outflow communication path 33. In addition, the second flow path 31 is included that is adjacent to the one end side in the first direction via the heat transfer plate 2 (heat transfer section 20).

  Further, the secondary adjacent flow path Sb is in the second small block B2a with respect to the first flow path 30 on the side opposite to the primary reference flow path Ra side in the first flow path 30 communicating with the first outflow communication path 33. In addition, the second flow path 31 adjacent to the other end side in the first direction via the heat transfer plate 2 (heat transfer section 20) is included.

  Further, the secondary adjacent flow path Sb is the first smaller than the first flow path 30 on the primary reference flow path Ra side of the first flow path 30 communicating with the first outflow communication path 33 in the second small block B2b. It includes the second flow path 31 adjacent on one end side in the direction via the heat transfer plate 2 (heat transfer section 20). Therefore, the secondary adjacent flow path Sb includes eight second flow paths 31,.

  Accordingly, the main body 3 includes a pair of primary connection paths 38a and 38a that connect the primary adjacent flow path Sa and the secondary adjacent flow path Sb. That is, the main body 3 includes a primary connection path 38a that connects the primary adjacent flow path Sa and the secondary adjacent flow path Sb in the first large block B1, and a primary adjacent flow path Sa and a secondary adjacent flow in the second large block B2. And a primary connection path 38a for connecting the path Sb.

  Each primary connection path 38a communicates with the second inflow communication path 34 via the primary adjacent flow path Sa. Moreover, in this embodiment, each of a pair of primary connection paths 38a and 38a is mutually connected. That is, the pair of primary connection paths 38a, 38a constitutes one flow path extending from one end to the other end in the first direction.

  In FIG. 5, for the sake of convenience, the primary connection path 38a is illustrated so as to be aligned with the second inflow communication path 34, the second outflow communication path 35, and the like in the second direction. As shown in FIG. 4, the primary connection path 38a is provided side by side with the second outflow communication path 35 in the third direction.

  And the main-body part 3 further has a pair of secondary connection path 38b which connects the secondary adjacent flow path Sb and the some 2nd flow path 31 used as the termination | terminus of the 2nd fluid B flow path. That is, the main body 3 has a secondary connection path 38b that connects the secondary adjacent flow path Sa in the first large block B1 and the plurality of second flow paths 31, which are the end of the second fluid B flow path, The secondary adjacent flow path Sa in the second large block B2 and the secondary connection path 38b for connecting the plurality of second flow paths 31, which are the end of the flow path of the second fluid B, are provided.

  In the present embodiment, each of the pair of secondary connection paths 38b, 38b communicates with each other. That is, the pair of secondary connection paths 38b constitute one flow path extending from one end to the other end in the first direction.

  In FIG. 5, for convenience, the secondary connection path 38b is also shown side by side with the second inflow communication path 34, the second outflow communication path 35, etc. in the second direction. As shown, the secondary connection path 38b is provided side by side with the second inflow communication path 34 in the third direction.

  The second outflow communication path 35 and the secondary connection path 38b penetrate one end of the heat transfer plate 2 (heat transfer section 20) in the second direction, and the second inflow communication path 34 and the primary connection path 38a It penetrates the other end of the heat transfer plate 2 (heat transfer part 20) in the direction.

  The second inflow communication path 34 communicates only with the primary adjacent flow path Sa, and the other second outflow communication path 35 communicates only with the second flow path 31 serving as the terminal end of the second fluid B flow path. Therefore, the flow path of the second fluid B is also a meandering flow path that switches the flow direction in the second direction.

  As described above, according to the plate heat exchanger 1 according to the present embodiment, the primary reference flow path Ra (predetermined first flow path) in which the first inflow communication passage 32 is located in the middle of the stacking direction of the heat transfer plates 2. It communicates with only one flow path 30). Thereby, since the 1st inflow communication path 32 is formed only to the middle position in the lamination direction of the heat-transfer plates 2, ..., the increase in the pressure loss of the 1st fluid A in the 1st inflow communication path 32 can be suppressed. it can.

  And a pair of primary branch channel 36a, 36a has at least 1 1st flow in each of one end side and the other end side rather than primary reference channel Ra in the lamination direction of primary reference channel Ra and heat exchanger plate 2, ... In order to make the passage 30 communicate with each other, the main body 3 has a system including one primary branch passage 36a communicated with the primary reference passage Ra as the passage of the first fluid A and the primary reference passage Ra. Two systems are formed with the system including the other primary branch path 36a.

  Accordingly, the length of the flow path of the first fluid A (flow path length per system) from the first inflow communication path 32 to the first outflow communication path 33 is shortened, so the flow path of the first fluid A An increase in pressure loss as a whole can be suppressed, and high heat exchange performance can be obtained.

  Further, the pressure acting on the first fluid A flowing on the first inflow communication passage 32 side (start end side) in the flow path of the first fluid A is the first outflow communication passage 33 side (end terminal) in the flow path of the first fluid A. Higher than the pressure acting on the first fluid A flowing on the side). Therefore, the temperature of the first fluid A flowing on the first inflow communication path 32 side in the flow path of the first fluid A is higher than that of the first fluid A flowing on the first outflow communication path 33 side in the flow path of the first fluid A. Get higher.

  Then, the second flow path 31 adjacent to the primary reference flow path Ra via the heat transfer plates 2 is used as the primary adjacent flow path Sa, and the second inflow communication path 34 is communicated only with the primary adjacent flow path Sa. The first fluid A flowing on the upstream side in the flow path of the first fluid A and the second fluid B flowing on the upstream side in the flow path of the second fluid B can be subjected to heat exchange. That is, the first fluid A and the second fluid B at the stage where the amount of heat (temperature) starts to change due to heat exchange can be heat exchanged.

  Thereby, it is avoided that the temperature of the first fluid A flowing upstream in the flow path of the first fluid A approaches the temperature of the second fluid B flowing upstream in the flow path of the second fluid B. The amount of heat of the second fluid B can be effectively used for heat exchange with the first fluid A. Therefore, heat exchange performance can be improved.

  As described above, in the plate heat exchanger 1, the first fluid A is uniformly supplied to the plurality of first channels 30 while suppressing an increase in pressure loss in the plurality of first channels 30 through which the first fluid A is circulated. It is possible to achieve an excellent effect that heat exchange between the first fluid A and the second fluid B can be performed efficiently.

  Further, the primary branch path 36a is located at a position halfway in the stacking direction of the heat transfer plates 2,... On the one end side and the other end side of the primary reference flow path Ra in the stacking direction of the heat transfer plates 2,. It communicates only with the next reference channel Rb (predetermined first channel 30). Therefore, the primary branch path 36a is formed only up to a midpoint in the stacking direction of the heat transfer plates 2,... On the one end side and the other end side of the primary reference channel Ra in the stacking direction of the heat transfer plates 2,. Therefore, an increase in the pressure loss of the first fluid A in the primary branch path 36a can be further suppressed.

  Further, the first fluid A is communicated with the secondary reference channel Rb as the channel of the first fluid A at each of the one end side and the other end side of the primary reference channel Ra in the stacking direction of the heat transfer plates 2 of the main body 3. The two systems of the system including one secondary branch path 36b and the system including the other secondary branch path 36b communicating with the secondary reference channel Rb are formed.

  Accordingly, in each of the one end side and the other end side of the primary reference channel Ra in the stacking direction of the heat transfer plates 2 of the main body 3, the first from the primary branch path 36 a to the first outflow communication path 33. The length of the flow path of the fluid A (flow path length per system) is shortened. Thereby, the increase in the pressure loss in the whole flow path of the 1st fluid A can be suppressed, and still higher heat exchange performance can be obtained.

  Further, the second flow path 31 adjacent to the secondary reference flow path Rb via the heat transfer plates 2,... Is used as the secondary adjacent flow path, and the primary adjacent flow path Sa and the secondary adjacent flow path Sb are connected to the primary connection path. Connect with 38a. That is, in the plate heat exchanger 1, the primary adjacent flow path with respect to the first flow path 30 in which the first fluid A having the smallest amount of temperature change due to heat exchange flows next to the first fluid A flowing in the primary reference flow path Ra. Next to the second fluid B flowing through Sa, the second flow path 31 through which the second fluid B having a small temperature change amount due to heat exchange flows is made adjacent.

  Thereby, it can avoid that the 1st fluid A which flows through secondary reference flow path Rb, and the temperature of the 2nd fluid B heat-exchanged with this 1st fluid A approach, and the calorie | heat amount of the 2nd fluid B Can be effectively used for heat exchange with the first fluid A. Therefore, the heat exchange performance can be further enhanced.

  Furthermore, since the primary adjacent flow path Sa includes the second flow path 31 adjacent to the first flow path 30 serving as the end of the flow path of the first fluid A via the heat transfer plates 2,. Heat exchange can be performed between the first fluid A flowing through the first flow path 30 serving as the end of the path and the second fluid B at the stage where heat exchange starts.

  Therefore, even if the plate heat exchanger 1 is configured to change the temperature of the first fluid A at the end of the flow path of the first fluid A, the first flow serving as the end of the flow path of the first fluid A By avoiding the temperature of the first fluid A flowing through the passage 30 from approaching the temperature of the second fluid B that exchanges heat with the first fluid A, the amount of heat of the second fluid B is reduced with the first fluid A. It can be used effectively for heat exchange, and heat exchange performance can be improved.

  More specifically, for example, when the plate heat exchanger 1 is used as an evaporator in a refrigeration cycle, the first fluid A containing an unvaporized liquid is discharged from the plate heat exchanger 1. There is a risk that the compressor that has sucked the first fluid A is damaged. For this reason, the plate heat exchanger 1 may be configured to discharge the completely heated first fluid A after further heating.

  In such a case, in the plate heat exchanger 1, in addition to the temperature of the first fluid A that flows upstream of the flow path of the first fluid A, the first fluid that flows downstream of the flow path of the first fluid A The temperature of A also increases. However, since the first fluid A flowing downstream of the flow path of the first fluid A and the second fluid B at the stage of starting heat exchange can be heat-exchanged, the end of the flow path of the first fluid A The temperature of the first fluid A flowing through the first flow path 30 and the temperature of the second fluid B heat-exchanged with the first fluid A can be avoided. Therefore, the heat quantity of the second fluid B can be effectively used for heat exchange with the first fluid A, and the heat exchange performance can be enhanced.

  Thus, in the plate heat exchanger 1 according to the present embodiment, the temperature change due to heat exchange between the first fluid A flowing through the first flow path 30 and the second fluid B flowing through the second flow path 31 is small. Heat exchange is performed in order.

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

  In the plate heat exchanger 1, the flow path of the first fluid A and the flow path of the second fluid B are not limited to those shown in FIG. For example, 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 formed symmetrically with respect to the primary reference flow path Ra. It is not limited to. 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 primary reference flow path Ra. That is, even if the number of the first flow paths 30,..., The arrangement of the secondary reference flow path Rb, the arrangement of the secondary branch path 36b, etc. are different in the first large block B1 and the second large block B2. Good.

  When 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 formed in an asymmetric form with respect to the primary reference flow path Ra. When the primary reference channel Ra is at a position shifted from the central position of the main body 3 in the first direction, the position of the primary adjacent channel Sa is changed according to the position of the primary reference channel Ra, and the primary The adjacent channel Sa may be adjacent to the primary reference channel Ra.

  Further, even when the secondary reference flow path Rb is at a position shifted from the central position in the first direction of the first large block B1 and the second large block B2, the second reference flow path Rb is changed according to the position of the secondary reference flow path Rb. The position of the secondary adjacent flow path Sb may be changed so that the secondary adjacent flow path Sb is adjacent to the secondary reference flow path Rb.

  In the above embodiment, the primary adjacent flow path Sa is a flow of the second fluid B in addition to the second flow path 31 adjacent to the primary reference flow path Ra via the heat transfer plate 2 (heat transfer section 20). Although the 2nd flow path 31 adjacent to the 1st flow path 30 used as the terminal of a path | route via the heat-transfer plate 2 (heat-transfer part 20) was included, it is not limited to this. For example, the primary adjacent flow path Sa may include only the second flow path 31 adjacent to the primary reference flow path Ra via the heat transfer plate 2 (heat transfer section 20).

  In the above embodiment, each of the pair of primary connection paths 38a, 38a communicates with each other, but is not limited thereto. For example, each of the pair of primary connection paths 38a and 38a may not be in communication with each other.

  In the above embodiment, the main body 3 is configured to have a pair of primary branch paths 36a, 36a, but is not limited thereto. For example, the main body 3 has two or more pairs of primary branches. It may be configured to have paths 36a, 36a.

  In this case, each primary branch path 36a may be connected to each of the first flow paths 30 different from each other. Further, in the main body 3, one primary branch path 36 a of each pair of primary branch paths 36 a may be connected to the same first flow path 30. In the main body 3, the other primary branch path 36 a of each pair of primary branch paths 36 a may be connected to the same first flow path 30.

  Furthermore, in this embodiment, as described above, the main body portion 3 is composed of the three or more first flow paths 30, 30... On the one end side and the other end side with respect to the primary reference flow path Ra in the stacking direction. The first flow path 30 in the middle of the stacking direction is a secondary reference flow path Rb that is a branch position of the flow path of the first fluid A.

  Therefore, when the main body portion 3 is configured to have two or more pairs of primary branch paths 36a, 36a..., Each of the primary branch paths 36a in each pair of primary branch paths 36a has the same secondary reference flow. It may be connected to the path Rb. And each of the other primary branch channel 36a in each pair of primary branch channels 36a may be connected to the same secondary reference channel Rb.

  Moreover, although the main-body part 3 which concerns on this embodiment was comprised so that it might have a pair of secondary reference flow path Rb, it is not limited to this, For example, according to the number of the primary branch paths 36a. , Two or more secondary reference channels Rb, Rb... May be configured. In this case, each primary branch channel 36a may be connected to a different secondary reference channel Rb.

  In the above-described embodiment, the pair of secondary branch paths 36b, 36b is connected to the main body 3 with respect to one secondary reference channel Rb. However, the present invention is not limited to this. Two or more pairs of secondary branch paths 36b, 36b... May be connected to the secondary reference flow path Rb.

  In this case, each primary branch path 36a may be connected to each of the first flow paths 30 different from each other. Further, in the main body 3, one primary branch path 36 a of each pair of primary branch paths 36 a may be connected to the same first flow path 30. And each of the other primary branch path 36a in each pair of primary branch paths 36a may be connected to the same 1st channel 30 mutually.

  DESCRIPTION OF SYMBOLS 1 ... Plate type heat exchanger, 2 ... Heat transfer plate, 3 ... Main-body part, 4 ... 1st end plate (one end plate), 5 ... 2nd end plate (the other end plate), 20 ... Heat transfer part , 21 ... fitting portion, 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 passage (one second communication passage), 35 ... second outflow communication passage (the other second communication passage), 36a ... primary branch passage, 36b ... secondary branch passage, 37a ... primary. Flow path (flow path), 37b ... Secondary flow path (flow path), 37c ... Tertiary flow path (flow path), 38a ... Primary connection path, 38b ... Secondary connection path, 40, 50 ... Sealing part, 41 , 51 ... fitting part, A ... first fluid, B ... second fluid, B1, B2 ... first large block (block), B1a, B b ... first small block (block), B2a, B2b ... second small block (block), Ra ... primary reference channel, Rb ... secondary reference channel, Sa ... primary adjacent channel, Sb ... secondary adjacent flow Road

Claims (3)

  A main body including a plurality of stacked heat transfer plates is provided, and the main body includes a first flow path for flowing the first fluid, a second flow path for flowing the second fluid, and a pair communicating with the first flow path. A pair of first passages that allow the first fluid to flow into and out of the first flow path, and a pair of second communication paths that communicate with the second flow path, A pair of second communication passages for flowing in and out of the second fluid, and the first flow path and the second flow path are alternately formed with the heat transfer plate as a boundary, and each of the first series passage and the second communication path In the plate heat exchanger formed through the heat transfer plate and extending in the laminating direction of the heat transfer plates, the first flow paths communicate with each other from one first series path to the other first series path. To the first fluid flow path, and a predetermined first flow path in the middle of the stacking direction is the first fluid flow path. It is a primary reference channel that becomes a branch position of the body channel, and a second fluid channel is formed from the second channel to the other second channel by communication between the second channels The second channel adjacent to the primary reference channel via the heat transfer plate is a primary adjacent channel, and the main body is on one end side of the primary reference channel and the primary reference channel in the stacking direction. And at least a pair of primary branch passages communicating with at least one first flow path on each of the other end sides, and each of the primary adjacent flow paths and the primary adjacent flow paths in the stacking direction on one end side and the other end side. A pair of primary connection paths that communicate with at least one second flow path, and a pair of primary connection paths that are connected to one second communication path via a primary adjacent flow path, The first series passage communicates only with the primary reference flow path and the other first series passage. The channel is a first channel on one end side and the other end side with respect to the primary reference channel in the stacking direction, and communicates only with the first channel serving as the end of the channel of the first fluid. The communication path communicates only with the primary adjacent flow path, and the other second communication path is a second flow path on one end side and the other end side with respect to the primary adjacent flow path in the stacking direction. A plate-type heat exchanger, wherein the plate-type heat exchanger communicates only with the second flow path that is the end of the flow path.   Three or more first flow paths are provided on each of the one end side and the other end side of the primary reference flow path in the stacking direction of the heat transfer plates, and the first fluid flow path is more than the primary reference flow path in the stacking direction. In each of the one end side and the other end side, a secondary reference flow path in which the first flow path in the middle of the stacking direction among the three or more first flow paths is a branch position of the flow path of the first fluid; In the second fluid flow path, the second flow path adjacent to the secondary reference flow path via the heat transfer plate is a secondary adjacent flow path, and the main body portion has the secondary reference flow path and the laminated layer. At least one pair of secondary branch passages communicating with at least one first flow passage on each of the one end side and the other end side of the secondary reference flow passage in the direction, each of the secondary branch passages being heat transfer One end side and the other end side of the primary reference channel in the plate stacking direction. It communicates with the secondary reference channel in, respectively, the primary connection path, plate heat exchanger according to claim 1 for connecting the primary adjacent channel and the secondary adjacent channel.   The plate-type heat exchanger according to claim 1 or 2, wherein the primary adjacent flow path includes a second flow path that is adjacent to the first flow path serving as a terminal end of the flow path of the first fluid via a heat transfer plate.

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