JP3909401B2 - Stacked heat exchanger - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stacked heat exchanger used for an evaporator for a car / air conditioner or the like.
[0002]
[Prior art]
Conventionally, this type of laminated evaporator has a tank on the end plate in both the tank type with the tank part provided on the upper and lower sides of the laminated plate and the single tank type with the tank part provided on one side. By joining the header part connected to the part and attaching the inlet / outlet pipe to the header part, the refrigerant introduction / discharge path is formed.
[0003]
[Problems to be solved by the invention]
However, in this case, in the cooling case for storing the evaporator, it is necessary to secure a space for the inlet / outlet pipe, the outer shape becomes large, and a separate process for joining the inlet / outlet pipe to the header portion is required, which is troublesome. There was a problem. In addition, if the inlet / outlet pipe and the header part are integrated and brazed together in the furnace, the process can be eliminated, but so-called furnace charging efficiency deteriorates, and there has been a sway that there is no change in the total cost. .
[0004]
Recently, an evaporator having a structure in which an inlet / outlet portion is gathered in one end plate has been proposed (see, for example, JP-A-7-294160 and JP-A-7-270089).
[0005]
However, with this conventional evaporator structure, there is a problem that the resistance increases because three tank portions are concentrated on one side.
[0006]
In both tank type evaporators, since the refrigerant usually expands in volume inside the evaporator, it is necessary to increase the size of the tank part to some extent, and the effective core area in the evaporator body is reduced accordingly. There was a problem.
[0007]
The object of the present invention is to solve the above-mentioned problems of the prior art, and by providing the fluid introduction flow path and the discharge flow path integrally in the end plate portion, the conventional process of attaching the inlet / outlet pipe is omitted, and the number of parts is reduced. The number of processing steps can be reduced, the manufacturing cost can be reduced, and the cooling case can be made compact. In addition, the effective core area can be sufficiently increased in the double tank type stacked evaporator. An object of the present invention is to provide a stacked heat exchanger that can be secured.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a laminated heat exchanger according to the present invention includes a large number of intermediate plates arranged in parallel and two sets of end plates arranged in pairs on the left and right outer sides. An upper tank forming recess is provided near the upper end of one side of each intermediate plate, and a pair of front and rear lower tank forming recesses are provided near the lower end of the intermediate plate one side. In addition, a reverse U-shaped fluid flow path forming recess is provided when viewed from the side, and two end portions of the fluid flow path forming recess are respectively connected to the lower tank forming recess. At the center of the concave part for forming the inverted U-shaped fluid flow path, a vertically extending partitioning ridge is provided from the upper end portion to the lower end part of the concave part, and at least one end plate of the set of left end plates. A recess for forming a fluid introduction channel is provided on the opposite surface of the fluid discharge channel, and a recess for forming a fluid discharge channel that is separated from the recess for forming the fluid introduction channel is provided on the opposite surface of at least one end plate. The left first end plate is provided with a fluid introduction hole communicating with the fluid introduction passage forming recess and a fluid discharge hole communicating with the fluid discharge passage formation recess, and the left second end on the inner side of the core. On the opposite surface of the plate, an upper tank forming recess connected to the fluid introduction flow path forming recess and a lower tank forming recess connected to the fluid discharge flow path forming recess are provided. A fluid flow path forming recess is provided on the facing surface of at least one of the end plates, and an upper surface continuous with the upper end of the fluid flow path forming recess is formed on the facing surface of the right fourth end plate inside the core. A recess for forming a tank and a recess for forming a lower tank connected to a lower end of the recess for forming a fluid flow path, and adjacent intermediate plates are layered in a state where the recesses face each other, In addition, the left end plate set is overlaid with the recesses facing each other, and the right end plate set is overlaid with the recesses facing each other, so that the adjacent intermediate plates face each other. By joining each other and the same peripheral edge portion, an upper tank portion, a number of inverted U-shaped flat tube portions viewed from the side surface, and a lower tank portion connected to the end of each flat tube portion are formed, By joining the peripheral edge portions of the left end plate to each other, the upper tank portion, the fluid introduction flow channel connected to the upper tank portion, and the fluid discharge flow channel separated from the fluid introduction flow channel are provided. And a lower tank portion connected to the lower end portion of the right end plate is joined to each other to form an upper tank portion, a fluid flow passage connected to the upper tank portion, and a lower tank connected to the lower end portion thereof. And a fluid passage hole is formed in the bottom wall of the upper tank formation recess of each intermediate plate, and a fluid passage hole is formed in each bottom wall of the lower tank formation recess, and the left side inside the core. A fluid passage hole is made in the bottom wall of the upper tank forming recess of the end plate, and a fluid passage hole is made in the bottom wall of the lower tank formation recess to form the upper tank of the right end plate inside the core. A fluid passage hole is formed in the bottom wall of the recess, and a fluid passage hole is formed in the bottom wall of the recess for forming the lower tank. The fluid introduced into the fluid introduction flow path passes through the upper tank portion of the left end plate set and the upper tank portion of the multiple intermediate plate sets to the upper tank portion of the right end plate set, and The fluid flows from the upper tank part through the fluid flow path and the lower tank part of the right end plate set to the same side end of the inverted U-shaped flat tube part from one of the lower tank parts of the set of intermediate plates. Then, after flowing in an inverted U shape in the flat tube portion, it flows out from the other lower tank portion, reaches the lower tank portion of the left end plate set, and finally flows from the fluid discharge passage of the left end plate set. It is characterized by flowing out to the outside through the discharge hole.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings.
[0010]
In this specification, front and rear, left and right, and top and bottom are based on FIG. 3, the left is the left side of FIG. 3, the right is the same right side, the front is the lower side of the figure, and the rear is the same upper side. The upper side means the front side of the drawing sheet and the lower side means the back side.
[0011]
The drawings show the case where the present invention is applied to a laminated evaporator for a car air conditioner.
[0012]
Referring to FIGS. 1 and 3 to 5, the laminated evaporator (1) according to the present invention is made of aluminum (including an aluminum alloy), and includes a number of intermediate plates (2) arranged in parallel, And two sets of end plates (20), (30), (50), and (60) arranged in pairs on the left and right outer sides.
[0013]
As shown in detail in FIGS. 1, 3 to 5, and 7, each intermediate plate (2) is provided with an upper tank forming recess (3) near the upper end of one side of the intermediate plate (2). ) A pair of front and rear lower tank forming recesses (5) and (5) are provided near the lower end of one side, and an intermediate plate (2) forms an inverted U-shaped fluid flow path in the middle of one side as viewed from the side. Recesses (4) are provided, and two end portions of the fluid flow path forming recesses (4) are connected to the lower tank forming recesses (5) and (5), respectively. In the center portion of the inverted U-shaped fluid flow path forming recess (4) of 2), a vertically extending partitioning ridge (6) is provided from the upper end portion to the lower end of the recess (4).
[0014]
Referring to FIGS. 3 and 6, a fluid introduction flow path forming recess (22) is formed on the opposing surface of the left first end plate (20) outside the core of the set of left end plates (20) and (30). A fluid discharge channel forming recess (23) separated from the recess (22), and a fluid introduction hole (24) in the bottom wall (22a) of the fluid introduction channel forming recess (22). A fluid discharge hole (26) is formed in the bottom wall (23a) of the fluid discharge channel forming recess (23).
[0015]
On the opposing surface of the left second end plate (30) inside the core, there is an upper tank forming recess (31) at the upper end, a fluid introduction flow path forming recess (32) connected to the upper tank forming recess, and the recess (32). Are provided with a fluid discharge channel forming recess (33) and a lower tank forming recess (34) connected to the lower end thereof.
[0016]
Not only the illustrated one but also a recess for forming a fluid introduction channel is provided on the opposing surface of at least one end plate of the left end plate (20) (30), and at least one end of the same is provided. It suffices if a concave portion for forming a fluid discharge channel that is separated from the concave portion for forming a fluid introduction channel is provided on the opposing surface of the plate, and the first end plate (20) on the left side is provided with a fluid introduction channel. It is only necessary that the fluid introduction hole (24) communicating with the recess and the fluid discharge hole (26) communicating with the fluid discharge channel forming recess are formed. Further, an upper tank forming recess (31) connected to the fluid introduction flow path forming recess is provided on the facing surface of the left second end plate (30) inside the core, and a lower part connected to the fluid discharge flow path forming recess. A tank forming recess (34) may be provided.
[0017]
Therefore, in an extreme case, the left first end plate (20) is flat on the entire surface, and the fluid introduction hole (24) communicated with the fluid introduction flow path forming recess (32) on the second end plate (30) side. ) And a fluid discharge hole (26) communicating with the fluid discharge channel forming recess (33), on the other hand, an upper tank forming recess on the opposite surface of the left second end plate (30). (31), a fluid introduction channel formation recess (32), a fluid discharge channel formation recess (33), and a lower tank formation recess (34) are provided.
[0018]
Conversely, the second left end plate (30) is flat except for the upper tank forming recess (31) and the lower tank forming recess (34), and is opposed to the left first end plate (20). The surface is provided with a fluid introduction channel forming recess (22) and a fluid discharge channel formation recess (23), and fluid is introduced into the bottom wall (22a) of the fluid introduction channel formation recess (22). A hole (24) is formed, and a fluid discharge hole (26) is formed in the bottom wall (23a) of the fluid discharge channel forming recess (23).
[0019]
Referring to FIGS. 5 and 10, a fluid flow path forming recess (52) is provided on the opposing surface of the right third end plate (50) outside the core of the set of right end plates (50) and (60). The upper tank forming recess (61), the fluid flow path forming recess (62), and the lower end of the recess (62) are formed on the opposite surface of the right fourth end plate (60) inside the core. And a lower tank forming recess (63) that is continuous with the portion.
[0020]
Note that, not limited to the illustrated one, a fluid flow path forming recess is provided on the opposing surface of at least one of the pair of right end plates (50) and (60), and the right fourth end on the inner side of the core. On the opposing surface of the plate (60), an upper tank forming recess (61) connected to the upper end of the fluid flow path forming recess and a lower tank forming recess (63) connected to the lower end of the fluid flow path forming recess And should be provided.
[0021]
Therefore, in extreme cases, the right third end plate (50) is flat on the entire surface, and the upper tank forming recess (61) and the fluid flow path forming recess are formed on the opposite surface of the right fourth end plate (60). (62) and a lower tank forming recess (63) are provided.
[0022]
Conversely, the right side fourth end plate (60) is flat except for the upper tank forming recess (61) and the lower tank forming recess (63), and is opposed to the right third end plate (50). On the surface, a fluid flow path forming recess (52) is provided.
[0023]
Adjacent intermediate plates (2) and (2) are stacked in layers with the recesses facing each other, and the pair of left end plates (20) and (30) are stacked with the recesses facing each other At the same time, the pair of right end plates (50) and (60) are superposed with the concave portions facing each other.
[0024]
The upper tank portion (10) is formed by joining the protruding protrusions (6), (6) facing each other and the peripheral edge portions (7), (7) of the adjacent intermediate plates (2), (2). And a number of inverted U-shaped flat tube portions (11) as viewed from the side, and front and rear lower tank portions (12a) and (12b) connected to the ends of the flat tube portions (11) (see FIG. 3).
[0025]
The peripheral portions (25) and (25) of the left end plates (20) and (30) are joined to each other, so that the upper tank portion (40), the fluid introduction flow path (41) connected thereto, and the fluid introduction flow A fluid discharge passage (43) separated from the passage (41) and a lower tank portion (42) connected to the lower end portion thereof are formed (see FIG. 4).
[0026]
The central part of the left first end plate (20) outside the core penetrates the fluid introduction part (45) and the fluid discharge part (46) communicating with the fluid introduction hole (24) and the fluid discharge hole (26). An expansion valve connecting block (44) provided in a shape is attached. In addition, O-rings (47) and (47) are respectively attached to the short cylindrical portions protruding outward at the peripheral portions of the fluid introduction portion (45) and the fluid discharge portion (46) of the block (44) ( (See FIG. 4).
[0027]
Further, by joining the peripheral edge portions (55) (65) of the right end plates (50) (60) to each other, the upper tank portion (70), the fluid flow path (71) connected thereto, and the A lower tank part (72) connected to the lower end part is formed (see FIG. 5).
[0028]
The upper tank part (40) provided between the left end plates (20) (30), the upper tank part (10) provided between the adjacent intermediate plates (2) (2), and Since the upper tank part (70) provided between the right and right end plates (50) and (60) is used only for the introduction of a fluid made of a refrigerant, as described later, their volume is determined by the left end plate ( 20) between the lower tank part (40) between (30), the lower tank part (12a) (12b) between the intermediate plates (2) (2), and between the right end plates (50) (60) If the size of the lower tank part (72) in between is about half the volume, it is good.
[0029]
Corrugated fins (18) between the adjacent flat tube portions (11) (11) or between the left and right end plates (30) (60) and the flat tube portion (11) on the same side adjacent to these. Are intervened.
[0030]
4 and 7, a fluid passage hole (13) is formed in the bottom wall (3 a) of the upper tank forming recess (3) of each intermediate plate (2). See also FIGS. 5 and 7. Then, fluid passage holes (15) and (15) are formed in the bottom walls (5a) and (5a) of the lower tank forming recesses (5) and (5), respectively.
[0031]
4 and 6, a fluid passage hole (36) is formed in the bottom wall (31a) of the upper tank forming recess (31) of the left third end plate (30) inside the core. 5 and FIG. 6, fluid passage holes (37) and (37) are formed in the bottom wall (34a) of the lower tank forming recess (34), respectively.
[0032]
4 and 10, a fluid passage hole (66) is formed in the bottom wall (61a) of the upper tank forming recess (61) of the right fourth end plate (60) inside the core. 5 and FIG. 10, a fluid passage hole (67) is formed in the bottom wall (63a) of the lower tank forming recess (63).
[0033]
2 and 5, the front side of the intermediate plate (2) at the center in the left-right direction among the intermediate plates (2) constituting the multiple parallel flat tubes (11) of the laminated evaporator (1). A partition wall (17) is provided on the bottom wall (5a) of the lower tank forming recess (5), and the core (A) is located on the right core unit (A1) on the right side of the partition wall (17). And the left core unit (A2) on the left side.
[0034]
In the laminated evaporator (1) of the illustrated embodiment, referring to FIG. 3 and FIG. 7, the middle plate (2) of each intermediate plate (2) is long in the vertical direction at the center of the width and A partition projection (6) having the same height as the peripheral edge (7) of the intermediate plate (2) is provided from the lower end of the recess (4) to the upper end portion.
[0035]
In the fluid flow path forming recesses (4) of each intermediate plate (2), a number of protrusions having a height twice the depth of the recesses (4) on both front and rear sides of the partitioning protrusions (6). The strips (8) and (9) are provided so as to form independent and parallel divided fluid flow paths in the flat tube portion (11) when the intermediate plates (2) and (2) are overlapped.
[0036]
That is, each ridge (8) (9) is a straight portion (8a) (9a) provided in both the front and rear linear flow path components (4a) (4b) of the fluid flow path forming recess (4), Further, it has a shape that is exactly half of a U-shape consisting of quarter arc portions (8b) and (9b) that are connected to these and are provided in the folded portion (4c) of the concave portion (4).
[0037]
The straight portions (8a) and (9a) of these ridges (8) and (9) and the quarter arc portions (8b) and (9b) are formed such that adjacent intermediate plates (2) and (2) are recessed (3 ) And (3) are arranged so as to be alternately positioned in the opposed state.
[0038]
Then, in the state where these two intermediate plates (2) and (2) are overlapped, the partitioning ridges (6) and (6) facing each other and the peripheral edge portions (7) and (7) of the intermediate plate are abutted with each other. And the end portions of the straight portions (8a) (9a) of the two ridges (8) (9) and the quarter arc portions (8b) (9b) are opposed to the intermediate plate ( 2) Connected to the bottom wall of the fluid flow path forming recess (4) and divided into the inverted U-shaped fluid flow path of the flat tube section (11) by the continuous ridges (8) and (9) The parallel inverted U-shaped divided fluid flow paths are formed. The folded portion of each divided fluid flow path has a semicircular arc shape.
[0039]
The cross section of each divided fluid flow path ensures that the liquid is evenly distributed in the inverted U-shaped fluid flow path of the flat tube portion (11) and that the joint area between the flat tube portion (11) and the corrugated fin (18) is secured. Therefore, the shape is close to a square. Moreover, about the cross-sectional area of each division | segmentation fluid flow path, what is inside is made the largest, what is outside is made the smallest, and what is in the middle is made mutually equal or larger inside. It is preferable that the outer and inner flow velocities are thereby made uniform.
[0040]
Note that front and rear corners at the lower end of each intermediate plate (2) are provided with substantially triangular front and rear reinforcing protrusions (19) having the same height as the peripheral edge (7) of the intermediate plate (2).
[0041]
4 and 7, a burring is formed on the periphery of one fluid passage hole (13) of the fluid passage holes (13) of the upper tank forming recess (3) of each intermediate plate (2). When the annular wall (14) projecting outside the recess (3) is provided by processing and the opposed intermediate plates (2) (2) of the adjacent flat tube portions (11) are overlapped, the upper tank portion In (10), the annular wall portion (14) at the periphery of the fluid passage hole (13) of the recess (3) for forming the upper tank of one intermediate plate (2) is used for forming the upper tank of the opposed intermediate plate (2). The recess (3) is fitted into the fluid passage hole (13).
[0042]
Similarly, referring to FIG. 5 and FIG. 7, among the fluid passage holes (15) of the lower tank forming recess (5) of each intermediate plate (2), the peripheral edge portion of one fluid passage hole (15) An annular wall (16) projecting outside the recess (5) is provided by burring and the opposed intermediate plates (2) and (2) of the adjacent flat tube (11) are overlapped with each other. In the parts (12a) and (12b), the annular wall (16) around the fluid passage hole (15) of the lower tank forming recess (5) of one intermediate plate (2) is connected to the opposite intermediate plate (2). The lower tank forming recess (5) is fitted into the fluid passage hole (15).
[0043]
Further, the intermediate plate (2) shown in FIG. 8 is provided with a partition wall portion (17) on the bottom wall (5a) of the front lower tank forming recess (5). Located in the center of the laminated evaporator (1) in the horizontal direction, the core (A) is divided into a right core unit (A1) and a left core unit (A2) (see FIGS. 2 and 5). .
[0044]
The intermediate plate (2) shown in FIG. 9 is provided with a partition wall (17) on the bottom wall (5a) of the rear lower tank forming recess (5). Disposed at the left end of the mold evaporator (1), the partition wall (17) is joined to the bottom wall of the lower tank forming recess (34) of the left second end plate (30) (FIG. 5). reference).
[0045]
Referring to FIG. 6, the fluid introduction flow path forming recesses (22) on the upper left first end plate (20) outside the core of the set of left end plates (20) and (30) are four upward. The parallel branch recesses (22A) branched to the lower end portions and the communication recesses (22B) connected to the lower end portions thereof are formed on the bottom wall (22a) of the communication recesses (22B). ) And an annular wall portion (27) protruding outward from the recess (22) by burring is provided at the peripheral portion of the fluid introduction hole (24).
[0046]
The fluid introduction flow path forming recess (23) below the first end plate (20) on the left side includes a parallel branch recess (23A) branched into four downwards, and a continuous connection to these upper ends. The fluid introduction hole (26) is formed in the bottom wall (23a) of the communication recess (23B) and the peripheral edge of the fluid introduction hole (26) is formed by burring. An annular wall portion (27) protruding outside the recess (23) is provided.
[0047]
On the other hand, the fluid introduction flow path forming recess (32) on the left second end plate (30) on the inner side of the core has a parallel branch recess (32A) branched into four upwards, and these It is comprised by the communication recessed part (32B) connected to a lower end part. The upper end of the second end plate (30) is provided with one horizontally long upper tank forming recess (31) connected to the four branch recesses (32A), and the bottom wall (31a) of the recess (31) is provided. ) Are provided with two horizontally long fluid passage holes (36) and (36). Among these, an annular wall portion (38) protruding outside the recess (31) by burring is provided at the peripheral portion of the front fluid passage hole (36).
[0048]
The fluid introduction flow path forming recess (33) below the second end plate (30) on the left side includes a parallel branch recess (33A) branched into four downwards, and a continuous connection to the upper ends thereof. It consists of a general recess (33B). A lower tank forming recess (34) connected to the four branch recesses (33A) is provided at the lower end of the second end plate (30), and the bottom wall (34a) of the recess (34) A fluid passage hole (37) is formed in the front side portion, and an annular wall portion (39) protruding outside the concave portion (34) by a burring process is provided on a peripheral portion of the fluid passage hole (37). (See FIG. 5).
[0049]
The pair of left end plates (20) and (30) are stacked with the recesses facing each other, and the adjacent intermediate plates (2) and (2) are stacked in layers with the recesses facing each other. Furthermore, when the expansion valve connecting block (44) is attached to the center of the left first end plate (20) outside the core, first, the fluid introduction hole (on the left first end plate (20) side) 24) The annular wall portion (27) at the peripheral edge and the fluid discharge hole (26) the annular wall portion (28) at the peripheral edge are located inside the core of the fluid introduction portion (45) and the fluid discharge portion (46) of the block (44). Each is fitted into an annular step provided on the peripheral edge (see FIG. 3).
[0050]
Further, the annular wall portion (38) around the front fluid passage hole (36) provided in the bottom wall (31a) of the upper tank forming recess (31) of the left second end plate (30) inside the core is: The intermediate plate (2) adjacent to each other is fitted into the fluid passage hole (13) on the same side of the upper tank forming recess (3), while the rear fluid passage hole (36) is inserted into the intermediate plate. (2) The annular wall portion (14) at the periphery of the fluid passage hole (13) on the side is fitted (see FIG. 4).
[0051]
Further, the annular wall portion (39) around the front fluid passage hole (37) provided in the bottom wall (34a) of the lower tank forming recess (34) of the second end plate (30) on the left side is mutually It fits in the fluid passage hole (15) on the same side of the lower tank forming recess (5) of the adjacent intermediate plate (2) (see FIG. 5).
[0052]
Next, referring to FIG. 10, a horizontally long upper tank forming recess (61) is provided at the upper end of the right fourth end plate (60) inside the core, and the bottom wall (61a) of the recess (61) is provided. ) Have two horizontally long fluid passage holes (66). Among these, an annular wall portion (68) protruding outside the recess (61) by burring is provided at the peripheral portion of the rear fluid passage hole (66) (see FIG. 4).
[0053]
The bottom end of the fourth end plate (60) on the right side is provided with one horizontally-long lower tank forming recess (63), and a fluid passage hole (63) is formed in the front side of the bottom wall (63a) of the recess (63). 67) is opened (see FIG. 5).
[0054]
Then, the pair of right end plates (50) and (60) are stacked with the recesses facing each other, and the adjacent intermediate plates (2) and (2) are stacked in layers with the recesses facing each other. At the same time, the annular wall portion (68) around the rear fluid passage hole (66) provided in the bottom wall (61a) of the upper tank forming recess (61) of the right fourth end plate (60). ) Is fitted into the fluid passage hole (13) on the same side of the recess (3) for forming the upper tank of the intermediate plate (2) adjacent to each other (see FIG. 5), while the hole for front fluid passage ( 66) is fitted with an annular wall portion (14) at the periphery of the fluid passage hole (13) of the intermediate plate (2) (see FIG. 4).
[0055]
Further, the annular wall portion (68) around the front fluid passage hole (67) provided in the bottom wall (63a) of the lower tank forming recess (63) of the fourth end plate (60) on the right side is mutually connected. The annular wall portion (14) at the periphery of the fluid passage hole (15) on the same side of the lower tank forming recess (5) of the adjacent intermediate plate (2) is fitted (see FIG. 5).
In the laminated evaporator (1), among the components, the intermediate plate (2), the left end plate (20) (30), and the right end plate (50) (60) are made of an aluminum brazing sheet. The corrugated fin (18) and the expansion valve connecting block (44) are made of aluminum.
[0056]
The laminated evaporator (1) is manufactured by being collectively brazed by, for example, a vacuum brazing method in a state where all the constituent members of the laminated evaporator (1) are combined.
[0057]
Referring to FIG. 2, the overall fluid flow path of the laminated evaporator (1) is as follows.
[0058]
That is, the fluid made of the refrigerant is introduced into the fluid introduction channel (41) of the left end plate (20) (30) through the fluid introduction hole (24) of the left first end plate (20). The fluid passes through the upper tank part (40) of the set of left end plates (20) (30) and the upper tank part (10) of the set of a number of intermediate plates (2) (2) to the right end plate (50 ) (60) to the upper tank section (70).
[0059]
From there, the fluid passes through the fluid flow path (71) and the lower tank part (72) of the right end plate (50) (60) from the upper tank part (70), and passes through a large number of right core units (A1). From the front lower tank part (12a) of one of the pair of intermediate plates (2) and (2) into the same end of the inverted U-shaped flat pipe part (11), and the inside of the flat pipe part (11) And then flows out from the other rear lower tank part (12b) to the rear lower tank part (12b) of the left core unit (A2).
[0060]
Further, the fluid flows from the rear lower tank portion (12b) of the left core unit (A2) into the same end portion of the inverted U-shaped flat tube portion (11), and this time inside the flat tube portion (11). After flowing from the rear to the front in a reverse U-shape, it flows out from the front lower tank part (12a) and reaches the lower tank part (42) of the left end plate (20) (30) set.
[0061]
Finally, the fluid flows out from the fluid discharge channel (43) of the left end plate (20) (30) through the fluid discharge hole (26) to the outside.
[0062]
On the other hand, the air flows from the front to the rear, and between the adjacent flat tube portions (11) and (11) of the laminated evaporator (1), between the flat tube portion (11) and the left second end plate ( 30) or through the gap where the corrugated fin (18) exists between the flat tube portion (11) and the right side fourth end plate (70), the intermediate plate (2), the left side second end plate (30), and the wall surface of the right side fourth end plate (70) and the corrugated fin (18), the fluid and air can be efficiently heat-exchanged.
[0063]
According to the laminated evaporator (1) of the illustrated embodiment, when the fluid flows in the inverted U-shaped fluid flow path of each flat tube portion (11), the fluid is mixed between the adjacent divided fluid flow paths. The fluid flows in the flat tube portion (11) without causing a staying portion in the fluid flow. Accordingly, the gas-liquid separation is reduced because it is only in one divided fluid flow path, and the pressure loss of the fluid is not increased. In particular, the flow of fluid in the turn portion becomes smooth, and the heat transfer rate can be improved. In addition, there is no stagnation or drift due to the flow of the fluid before and after the turn portion of the inverted U-shaped flat tube (11), and the accumulation of oil that is slightly mixed in the fluid is prevented. The difference in average temperature is reduced, and the heat transfer coefficient is further improved.
[0064]
The shape of the ridges (8) (9) provided on each intermediate plate (2) is not limited to that shown in the figure, and when the adjacent intermediate plates (2) (2) are overlapped, Various modifications are possible as long as a parallel inverted U-shaped divided fluid flow path is formed.
[0065]
In the intermediate plate (2), the ridges (8) and (9) are provided so as to be alternately positioned in the overlapping state of the adjacent intermediate plates (2) and (2), and both intermediate plates (2) ( After overlapping 2), in the inverted U-shaped fluid flow path of the flat tube portion (11), it is symmetrically arranged in the front and back so that it becomes an inverted U shape as a whole by the double ridges (8) and (9). Therefore, the number of protrusions (8) and (9) provided on each intermediate plate (2) can be reduced, so that the shape of each intermediate plate (2) is simple, easy to form, and reduces the manufacturing cost. To get.
[0066]
In addition, the tips of the ridges (8) and (9) of the concave portion (4) for forming the inverted U-shaped fluid flow path of each intermediate plate (2) are located at the bottom of the concave portion (4) of the opposed intermediate plate (2). Since it is bonded to the wall (18), the bonding area is increased, so that the pressure resistance is increased because the bonding is not performed by so-called point contact but by line contact.
[0067]
In the laminated evaporator (1) of the illustrated embodiment, the fluid introduction provided on the facing surface of the left first end plate (20) outside the core in the set of left end plates (20), (30). The flow path forming recess (22) and the fluid discharge flow path forming recess (23) are formed to have substantially the same size, but one of these recesses (22) and (23) is smaller. The other may be large.
[0068]
In the illustrated example, the core (A) of the laminated evaporator (1) is provided in the front half of the bottom wall (5a) of the lower tank forming recess (5) of the intermediate plate (2) at the center in the left-right direction. However, the position where such a partition wall (17) is provided is not limited to one-half of the left and right ends, and heat exchange performance is not limited. It is shifted from side to side as appropriate. In some cases, the core (A) can be made one without providing such a partition wall (17), or two or more such partition walls (17) can be provided. Thus, the core (A) of the laminated evaporator (1) may be divided into three or more.
[0069]
Further, in the illustrated example, each intermediate plate (2) is provided with protrusions (8) and (9), and a parallel inverted U-shaped divided fluid flow is provided between adjacent intermediate plates (2) and (2). Although a path is formed, inner fins (not shown) such as multi-entry fins are not provided between the intermediate plates (2) and (2) without providing such protrusions on the intermediate plate (2). It may be inserted to form a fluid flow path, and various changes can be made to the formation of the fluid flow path in the flat tube portion (11).
[0070]
Further, the top and bottom and left and right of the laminated evaporator (1) may be opposite to those shown in the figure, and accordingly, the upper tank portion (40) of the left end plate (20) (30) set on the fluid introduction side, The upper tank (10) of the set of a number of intermediate plates (2) (2) and the upper tank part (70) of the set of right end plates (50) (60) are arranged on the lower side. Also good.
[0071]
【The invention's effect】
As described above, the laminated heat exchanger according to the present invention includes a large number of intermediate plates arranged in parallel, and two sets of end plates arranged in pairs on the left and right outer sides. An upper tank forming recess is provided near the upper end of one side of the plate, and a pair of front and rear lower tank forming recesses are provided near the lower end of the intermediate plate. An inverted U-shaped fluid flow path forming recess is provided, and two ends of the fluid flow path forming recess are connected to the lower tank forming recess, respectively. A partitioning ridge that is long in the vertical direction at the center of the channel-forming recess is provided from the upper end portion to the lower end of the recess, on the opposing surface of at least one end plate of the left end plate set, Flow A recess for forming an introduction channel is provided, and a recess for forming a fluid discharge channel that is separated from the recess for forming the fluid introduction channel is provided on the opposing surface of at least one end plate. The plate has a fluid introduction hole communicating with the recess for forming the fluid introduction flow path and a fluid discharge hole communicating with the recess for forming the fluid discharge flow path, and a fluid is formed on the opposing surface of the left second end plate inside the core. An upper tank forming recess that is continuous with the introduction flow path forming recess is provided, and a lower tank forming recess that is continuous with the fluid discharge flow path forming recess is provided, and at least one end plate of the set of right end plates is provided. A fluid channel forming recess is provided on the opposing surface, and an upper tank forming recess connected to the upper end of the fluid channel forming recess is provided on the opposing surface of the right fourth end plate inside the core. A lower tank forming recess connected to the lower end of the fluid flow path forming recess, the adjacent intermediate plates are stacked in layers with the recesses facing each other, and a set of left end plates Are superimposed in a state where the concave portions are opposed to each other, and the pair of right end plates are superimposed in a state where the concave portions are opposed to each other. By joining together, an upper tank part, a number of inverted U-shaped flat tube parts viewed from the side, and a lower tank part connected to the end of each flat tube part are formed, and the peripheral part of the left end plate By joining each other, the upper tank portion, the fluid introduction flow channel connected to the upper tank portion, the fluid discharge flow channel divided from the fluid introduction flow channel, and the lower end portion thereof are connected. The lower tank part is formed, and the peripheral parts of the right end plate are joined to each other, thereby forming the upper tank part, the fluid flow path connected to the upper tank part, and the lower tank part connected to the lower end part thereof, A fluid passage hole is formed in the bottom wall of the upper tank formation recess of each intermediate plate, and a fluid passage hole is formed in the bottom wall of the lower tank formation recess to form the upper tank of the left end plate inside the core. A fluid passage hole is formed in the bottom wall of the recess for forming the fluid, and a fluid passage hole is formed in each bottom wall of the recess for forming the lower tank. A passage hole is made and a fluid passage hole is made in the bottom wall of the recess for forming the lower tank. In the fluid introduction flow path of the left end plate pair from the fluid introduction hole of the left end plate The introduced fluid passes through the upper tank portion of the left end plate set and the upper tank portion of the plurality of intermediate plate sets, and reaches the upper tank portion of the right end plate set. After passing through the fluid flow path of the right end plate set and the lower tank part, it flows into the same side end part of the inverted U-shaped flat pipe part from one lower tank part of the set of many intermediate plates, and passes through the flat pipe part. After flowing in the reverse U shape, it flows out from the other lower tank part, reaches the lower tank part of the left end plate set, and finally passes through the fluid discharge hole of the left end plate set to the outside. According to the laminated heat exchanger of the present invention, the conventional inlet / outlet pipe mounting is provided by integrally providing the fluid introduction flow path and the discharge flow path in the end plate portion. Skip process, it is possible to reduce the number of parts, it is possible to reduce the number of machining steps can reduce the turn manufacturing cost. In addition, the outer shape of the heat exchanger is reduced as much as the installation of the inlet / outlet pipe is omitted, and the cooling case for housing the heat exchanger can be made compact.
[0072]
The upper tank portion provided between the left end plates, the upper tank portion provided between the adjacent intermediate plates, and the upper tank portion provided between the right end plates are made of a refrigerant. Since they are used only for the introduction of fluid, their volumes are between the lower tank provided between the left end plates, the lower tank provided between adjacent intermediate plates, and the right end plates. For example, the volume of the lower tank portion provided in the tank may be half the volume, and therefore, the effective core area of the double tank type evaporator can be sufficiently secured.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view of a product of the present invention.
FIG. 2 is a schematic perspective view for explaining a fluid flow path of the product of the present invention.
FIG. 3 is a horizontal cross section of a central portion of the product of the present invention.
FIG. 4 is a horizontal section of the upper tank portion of the product of the present invention.
FIG. 5 is a horizontal section of a lower tank portion of the product of the present invention.
FIG. 6 is a perspective view showing a set of left end plates.
FIG. 7 is a perspective view showing a set of intermediate plates.
FIG. 8 is a perspective view showing an example of an intermediate plate having a partition wall portion.
FIG. 9 is a perspective view showing another example of an intermediate plate having a partition wall portion.
FIG. 10 is a perspective view showing a set of right end plates.
[Explanation of symbols]
1 Stacked evaporator (stacked heat exchanger)
2 Intermediate plate
3 Recess for forming upper tank
3a Bottom wall
4 Inverted U-shaped recess for fluid flow path formation
5 Lower tank forming recess
5a Bottom wall
6 Long partition ridges
7 Perimeter
10 Upper tank
11 Inverted U-shaped flat tube section viewed from side
12a Front lower tank
12b Rear lower tank
13 Fluid passage hole
15 Fluid passage hole
20 Left first end plate
22 Concave portion for forming fluid introduction flow path
22a Bottom wall
23 Recess for forming fluid discharge flow path
23a Bottom wall
24 Fluid introduction hole
25 Perimeter
26 Fluid discharge hole
30 Left second end plate
31 Recess for upper tank formation
31a Bottom wall
32 Fluid introduction flow path forming recess
33 Concave portion for forming fluid discharge channel
34 Recess for forming lower tank
34a Bottom wall
36 Fluid passage hole
37 Fluid passage hole
40 Upper tank
41 Fluid introduction flow path
42 Lower tank
43 Fluid discharge flow path
50 Right third end plate
52 Recess for fluid flow path formation
55 Perimeter
60 Right fourth end plate
61 Recess for forming upper tank
61a Bottom wall
62 Recess for forming fluid flow path
63 Recess for forming lower tank
63a Bottom wall
65 peripheral edge
66 Fluid passage hole
67 Fluid passage hole
70 Upper tank
71 Fluid flow path
72 Lower tank

Claims (5)

  Each intermediate plate includes a number of intermediate plates (2) arranged in parallel and two sets of end plates (20), (30), (50), and (60) arranged in pairs on the left and right outer sides. An upper tank forming recess (3) is provided near the upper end of one side of (2), and a pair of front and rear lower tank forming recesses (5) and (5) are provided near the lower end of the intermediate plate (2). The intermediate plate (2) is provided with a reverse U-shaped fluid flow path forming recess (4) as viewed from the side surface at an intermediate portion at one side of the height, and two ends of the fluid flow path forming recess (4). Are connected to the lower tank forming recesses (5) and (5), respectively, and a vertically long partition is formed at the center of the inverted U-shaped fluid flow path forming recess (4) of each intermediate plate (2). The projecting ridge (6) is provided from the upper end portion to the lower end portion of the concave portion (4), and is provided on at least one end plate of the pair of left end plates (20) (30). A concave portion for forming a fluid introduction channel is provided on the opposite surface, and a concave portion for forming a fluid discharge channel that is separated from the concave portion for forming the fluid introduction channel is provided on the opposite surface of the at least one end plate. The left first end plate (20) has a fluid introduction hole (24) communicating with the recess for forming a fluid introduction channel and a fluid discharge hole (26) communicating with the recess for forming a fluid discharge channel, On the opposite surface of the left second end plate (30) on the inner side of the core, there is provided an upper tank forming recess (31) connected to the fluid introduction flow path forming recess, and a lower tank forming connected to the fluid discharge flow path forming recess. For the right end plate (50) (60), and a fluid flow path forming recess is provided on the opposing surface of at least one end plate of the pair of right end plates (50, 60). On the opposite surface of the plate (60), above the recess for fluid flow path formation An upper tank forming recess (61) connected to the end and a lower tank forming recess (63) connected to the lower end of the fluid flow path forming recess are provided, and adjacent intermediate plates (2) (2 ) Are stacked in layers with the recesses facing each other, and the pair of left end plates (20), (30) are stacked with the recesses facing each other, and the right end plate (50) ( 60) are superposed with the concave portions facing each other, and the adjacent intermediate plates (2) and (2) on the partition ribs (6) and (6) facing each other, and the peripheral edge portion (7) (7) By joining together, the upper tank part (10), a number of inverted U-shaped flat pipe parts (11) as viewed from the side, and the lower tank connected to the end of each flat pipe part (11) Parts (12a) and (12b) are formed, and the peripheral parts (25) and (25) of the left end plates (20) and (30) are joined to each other, so that the upper tank part (4 0), a fluid introduction flow path (41) connected to the fluid introduction flow path (41), a fluid discharge flow path (43) separated from the fluid introduction flow path (41), and a lower tank section (42) continuous to the lower end portion thereof. The peripheral portions (55), (65) of the right end plates (50), (60) are joined to each other, whereby the upper tank portion (70) and the fluid flow path (71) connected to the upper tank portion, A lower tank portion (72) connected to the lower end portion of this is formed, and a fluid passage hole (13) is formed in the bottom wall (3a) of the upper tank forming recess (3) of each intermediate plate (2), In addition, the bottom walls (5a) and (5a) of the recesses for forming the lower tank (5) and (5) are respectively provided with fluid passage holes (15) and (15) to form the upper tank of the left end plate (30) inside the core. A fluid passage hole (36) is formed in the bottom wall (31a) of the concave portion (31), and a fluid passage hole (37) (37) is formed in the bottom wall (34a) of the lower tank formation concave portion (34). The upper tank of the right end plate (60) inside the core is opened A fluid passage hole (66) is formed in the bottom wall (61a) of the forming recess (61), and a fluid passage hole (67) is formed in the bottom wall (63a) of the lower tank forming recess (63). The fluid introduced into the fluid introduction channel (41) of the left end plate (20) (30) through the fluid introduction hole (24) of the left end plate (20) (30) upper tank part (40) and a number of intermediate plates (2) (2) upper tank part (10), then right end plate (50) (60) upper tank Furthermore, the fluid passes through the fluid flow path (71) and the lower tank portion (72) of the right end plate (50) (60) from the upper tank portion (70) and passes through a number of intermediate portions. From the lower tank part (12a) of one set of the plates (2) and (2), it flows into the same end of the inverted U-shaped flat tube part (11), and the inside of the flat tube part (11) is inverted U-shaped. After flowing, it flows out from the other lower tank part (12b) and the left end plate (2 0) to the lower tank part (42) of the group (30), and finally from the fluid discharge channel (43) of the group of the left end plate (20) (30) to the outside through the fluid discharge hole (26). Laminated heat exchanger designed to flow out. Parallel flat tube (11) Comprising the intermediate plate (2) Of these, the middle plate in the center in the left-right direction (2) Recess for forming the front lower tank (Five) Bottom wall (5a) Partition wall (17) Is provided, core (A) Is the partition wall (17) Right core unit on the right side (A1) And the left core unit on the left (A2) The laminated heat exchanger according to claim 1, which is divided into Each intermediate plate (2) Recess for fluid flow path formation (Four) And partitioning ridges (6) Many ridges on both front and rear sides (8) (9) There is an intermediate plate (2) (2) The flat tube in the overlapped state (11) The laminated heat exchanger according to claim 1 or 2, wherein independent parallel U-shaped divided fluid flow paths are formed therein. Intermediate plates (2) (2) The laminated heat exchanger according to claim 1 or 2, wherein an inner fin is inserted between the two to form a fluid flow path. A car air conditioner using the stacked heat exchanger according to any one of claims 1 to 4.

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