JP2002340495A - Lamination type heat exchanger, lamination type evaporator for car air-conditioner and refrigerating system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lamination type heat exchanger capable of uniformizing the dispersion of fluid from a header into respective flat tubes, a lamination type evaporator for car air-conditioner which is improved in the cooling efficiency of the same and a refrigerating system improved in the efficiency of the whole of the system. SOLUTION: Either one of left and right end plates 20 is provided with a circular fluid-introducing through-hole 27 communicating with a fore header 12b. The fluid introducing through hole 27 is covered by a semi-spherical fluid dispersion unit 60 having a plurality of small holes 60a. The fluid dispersion unit 60 can be arranged in the lower half of the through-hole 27.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a laminated heat exchanger,
The present invention relates to a laminated evaporator and a refrigeration system for a car air conditioner.

In this specification, the terms up, down, left, and right refer to the top, bottom, left, and right in FIG. 1, and the front refers to the front side of the paper of FIG. 1, and the rear refers to the back side of the paper of FIG. However, front and rear, left and right are for convenience, and these may be used in reverse, or the fluid inlet and outlet may be used in reverse.

[0003]

2. Description of the Related Art Conventionally, there are two types of laminated heat exchangers used as, for example, a laminated evaporator for a car air conditioner, a type having a header portion on one of upper and lower sides, or a type having both header portions.

A conventional laminated heat exchanger has, for example, a flat tube portion forming recess on one surface and a header forming recess deeper than the flat tube portion and connected to at least one of the upper and lower sides. An intermediate plate having a fluid passage hole formed in the bottom wall thereof is superposed in a layered manner with the concave portions facing each other, so that a parallel flat tube portion and a header portion connected to a plurality of flat tube portions are formed. End plates were arranged on both left and right outer sides, respectively.

[0005]

In the above-mentioned laminated heat exchanger, it is important that the fluid is uniformly distributed from the header portion to each flat tube portion. For example, the number of flat tube portions is adjusted. In this way, the flow of the fluid is made uniform. However, this method has a problem that it cannot be sufficiently uniformized, or sacrifices passage resistance.

Therefore, when such a stacked heat exchanger is used as an evaporator for a car air conditioner, there is a problem that the cooling efficiency is insufficient, and such a stacked heat exchanger is used as an evaporator. Refrigeration system in which the refrigerant compressed by the compressor is condensed by a condenser, the condensed refrigerant is passed through a decompressor to reduce the pressure, and the decompressed refrigerant is evaporated by an evaporator and returned to the compressor. In this case, there is a problem that the efficiency of the entire refrigeration system becomes insufficient due to the lack of the refrigerant dispersion function of the evaporator.

An object of the present invention is to provide a laminated heat exchanger capable of equalizing the flow of a fluid from a header portion to each flat tube portion.

Another object of the present invention is to provide a laminated type evaporator for a car air conditioner in which the flow of the refrigerant from the header portion to each of the flat tube portions can be made uniform, so that the cooling efficiency is improved. is there.

Still another object of the present invention is to provide a refrigeration system in which the efficiency of the entire system is improved by using a stacked heat exchanger capable of equalizing the flow of fluid from the header section to each flat tube section. It is to provide a system.

[0010]

The stacked heat exchanger according to the present invention includes a number of intermediate plates arranged in parallel, and end plates arranged on both left and right sides thereof. An upper header forming portion and a flat tube portion forming recess in which a pair of front and rear fluid passage holes are formed in the intermediate plate are provided, and a large number of intermediate plates are laminated in layers with the recesses facing each other. A front and rear upper header portion connecting the parallel flat tube portions and the plurality of flat tube portions is formed, and a fluid introduction through-hole communicating with one of the front and rear upper header portions is provided on one of the left and right end plates. In the stacked heat exchanger provided with a fluid discharge through hole communicating with the other end, at least a part of at least one of both through holes provided in the end plate has a plurality of small holes. It is covered by a fluid dispersion unit which is characterized in.

[0011] According to the laminated heat exchanger of the present invention, the flow of the fluid from the upper header to the flat tube is adjusted by the fluid dispersing portion. As a result, the flow of the fluid can be made uniform, and the flow of the heat can be made uniform. The exchange efficiency can be greatly increased.

In the above-mentioned laminated heat exchanger, each through hole is, for example, as follows.

One of the two through holes may be covered with the fluid dispersion part, and the two through holes may be covered with the fluid dispersion part. For example, first, a fluid dispersion portion is provided in the through hole for fluid introduction, and if the required level is reached by this, the fluid dispersion portion may be only the through hole side for fluid introduction, and higher efficiency is required. If possible, a fluid dispersion portion may be provided also in the through hole for fluid discharge. When both the through holes are covered with the fluid dispersion portion, the configuration of each fluid dispersion portion may be the same or different.

[0014] The fluid dispersion portion may be arranged in the lower half of each through hole. By doing so, the blowing from the upper half and the blowing from the lower half become asymmetric, and it is possible to further enhance the dispersion effect.

The through-hole covered by the fluid dispersion may be circular, and the fluid dispersion may be spherical. With this configuration, the direction of the fluid blown out from the small holes can be changed upward or downward by the spherical surface, so that the dispersion effect can be further improved.

The through hole covered by the fluid dispersion portion may be circular, and the fluid dispersion portion may be disc-shaped. This facilitates the processing for forming the fluid dispersion portion on the end plate.

The through hole covered by the fluid dispersion portion may be circular, and the fluid dispersion portion may have an annular shape covering the periphery of the hole. At this time, the central part of the through-hole may be shaped like a nozzle. In this case, the blowing of the fluid from the central portion and the blowing of the fluid from the peripheral portion can be separately adjusted, so that the degree of design freedom is increased and the dispersion effect can be further improved.

Further, the laminated evaporator for a car air conditioner according to the present invention comprises a number of intermediate plates arranged in parallel, and end plates arranged on both left and right sides of the intermediate plates. An upper header forming portion with a coolant passage hole and a flat tube portion forming recess are provided, and a number of intermediate plates are stacked in layers with the recesses facing each other to form a parallel flat tube. And a front and rear upper header portion connecting the plurality of flat tube portions, and a refrigerant introduction through hole and a refrigerant discharge through the refrigerant introduction through hole to one of the front and rear upper header portions on one of the left and right end plates. And at least one of the two through holes provided in the end plate has a plurality of small holes. And it is characterized in that it is covered by the refrigerant distribution unit that.

According to the laminated evaporator for a car air conditioner of the present invention, the flow of the refrigerant from the upper header portion to the flat tube portion is adjusted by the refrigerant dispersion portion, and as a result, the flow of the refrigerant can be made uniform. Thus, the cooling efficiency can be greatly increased.

In the refrigeration system according to the present invention, the refrigerant compressed by the compressor is condensed by the condenser, the condensed refrigerant is passed through the decompressor to reduce the pressure, and the decompressed refrigerant is reduced by the evaporator having a refrigerant dispersing function. A refrigeration system that evaporates and returns to the compressor, the evaporator having a refrigerant dispersing function includes a number of intermediate plates arranged in parallel, and end plates arranged on both left and right sides thereof. Each intermediate plate is provided with an upper header forming portion having a pair of front and rear refrigerant passage holes and a flat tube portion forming concave portion, and a number of intermediate plates are layered in a state where the concave portions are opposed to each other. By being combined, a parallel flat tube portion and a front and rear upper header portion for connecting a plurality of flat tube portions are formed, and one of the left and right end plates is provided with one of the front and rear upper header portions. In the refrigeration system, at least one of the two through-holes provided in the end plate is provided with a through-hole for introducing the refrigerant and a through-hole for discharging the refrigerant communicating with the other end. The part is covered by a refrigerant dispersion part having a plurality of small holes.

According to the refrigeration system of the present invention, in the evaporator, the flow of the refrigerant from the upper header portion to the flat tube portion is adjusted by the refrigerant dispersion portion, and as a result, the flow of the refrigerant can be made uniform. Therefore, the efficiency of the whole system can be greatly increased.

In the above-described laminated evaporator and refrigeration system for a car air conditioner, the through holes are as follows, for example.

Either of the two through holes may be covered by the refrigerant dispersion part, and both of the through holes may be covered by the refrigerant dispersion part. For example, first, a coolant dispersion portion is provided in the through hole for introducing the coolant, and if the required level is thereby reached, the coolant dispersion portion may be provided only on the through hole side for introducing the coolant, and higher efficiency is required. If possible, a coolant dispersion section may be provided also in the through hole for discharging the coolant. When both of the through holes are covered with the coolant dispersion portions, each coolant dispersion portion may have the same configuration or may be different.

[0024] The refrigerant dispersion portion may be arranged in the lower half of each through hole. By doing so, the blowing from the upper half and the blowing from the lower half become asymmetric, and it is possible to further enhance the dispersion effect.

The through hole covered by the coolant dispersion portion may be circular, and the coolant dispersion portion may be spherical. With this configuration, the direction of the fluid blown out from the small holes can be changed upward or downward by the spherical surface, so that the dispersion effect can be further improved.

The through hole covered by the coolant dispersion portion may be circular, and the coolant dispersion portion may have a disk shape. This facilitates the processing for forming the refrigerant dispersion portion on the end plate.

The through hole covered by the coolant dispersion portion may be circular, and the coolant dispersion portion may have an annular shape covering the periphery of the hole. At this time, the central part of the through-hole may be shaped like a nozzle. In this case, the blowing of the fluid from the central portion and the blowing of the fluid from the peripheral portion can be separately adjusted, so that the degree of design freedom is increased and the dispersion effect can be further improved.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the laminated heat exchanger according to the present invention will be described below with reference to FIGS. The drawings show a case where the present invention is applied to a laminated evaporator for a car air conditioner.

The laminated evaporator (1) is made of aluminum (including an aluminum alloy), and has a number of intermediate plates (2) arranged in parallel, and end plates arranged on both left and right outer sides thereof. (20) and (30), and have a substantially rectangular shape when viewed from the front.

A pair of front and rear cup-shaped protrusions (13) and (15) having header forming recesses (3) and (5) inside are provided at upper and lower ends on one side of each intermediate plate (2), respectively.
In the middle part of the height of the plate (2), a bulging convex part (14) having a shallow flat tube part forming concave part (4) connected to these header forming concave parts (3) (5) inside is provided. Is provided. The flat tube-shaped recess (4) is divided into two parts by a vertically long partitioning ridge (6) provided at the center thereof.

At the top and bottom ends of each intermediate plate (2), the front ends of the front and rear cup-shaped projections (13), (13), (15) and (15) are provided with substantially oblong refrigerant passage holes (long and short). 8a) (8b) (9a) (9b)
Are opened, and all the intermediate plates (2) are stacked in layers with the recesses (3), (4), and (5) facing each other, so that the parallel front and rear flat tube portions (11) And front and rear upper and lower header portions (10) and (12) connected to the upper and lower ends of each flat tube portion (11). Each flat tube part (11)
The inner fin (17) is accommodated between the flat tubes (11) and (11) adjacent to each other, or the left and right end plates (20) and (30) and the adjacent flat tubes on the same side. Tube (1
The corrugated fins (18) are interposed between the corrugated fins (1) and (1).

A coolant introduction through hole (27) is provided behind the left end plate (20) near the upper end, and a coolant discharge through hole (27) is provided in front of the upper end of the end plate (20).
(28) is provided. Then, the left end plate (2
A substantially rectangular aluminum flange (40) as viewed from the side is attached to the outer surface of the upper end of (0), and the pipe end connection block (50) is attached to the outer surface of the flange (40) in a rearward downward inclined state. Attached to. Pipe end connection block (50)
Is provided with a refrigerant introduction pipe insertion port (54) and a refrigerant discharge pipe insertion port (55).

As shown in FIGS. 3 and 4 in an enlarged manner, the through holes (2) for introducing refrigerant provided in the left end plate (20) are shown.
7) is covered with a hemispherical plate-shaped refrigerant dispersion portion (60) having a plurality of evenly arranged small holes (60a) and projecting in the refrigerant discharge direction.

Of the many parallel intermediate plates (2),
The bottom wall of the recess (3) for the upper header on the rear side of the intermediate plate (2) at the center in the left-right direction of the evaporator (1) has no coolant passage hole, and a partition wall (16) is formed. The upper header portion (10a) on the rear side is divided into left and right by the partition wall portion (16).

In the right half of the evaporator (1), the recesses (3) (3) for forming the front and rear headers of each intermediate plate (2) are communicated with each other via a communication passage (19). The refrigerant can move from the right half of the rear upper header section (10a) to the right half of the front upper header section (10b) through these communication passages (19).

In the above-mentioned laminated evaporator (1),
Among the constituent members, the intermediate plate (2), the left and right end plates (20) and (30) are each made of aluminum brazing sheet, and the inner fin (17),
The corrugated fin (18), the flange (40) and the pipe connection block (50) are each made of aluminum. In addition, the side plate (20) with the refrigerant dispersion part (60) is
It is manufactured by the same process as that for manufacturing the intermediate plate (2) with (8a) and (8b).

Then, in a state where all the constituent members of the laminated evaporator (1) are combined, they are collectively brazed by, for example, a vacuum brazing method, whereby the evaporator is formed.
(1) is to be manufactured.

In the laminated evaporator (1), the refrigerant is
As shown in FIG. 8, a left end plate (20) of a left end plate (20) is passed from a refrigerant introduction pipe (not shown) through a tube end connection block (50) and refrigerant introduction paths (51) and (42) in a flange (40). Through the coolant introduction through hole (27) at the upper end, the rear upper header (10a)
Flows into the left end of the. The refrigerant passes through the inside of the left half of the rear upper header section (10a) until hitting the partition wall (16) of the intermediate plate (2) at the center in the left-right direction of the evaporator (1), and at the same time, the rear upper header section It descends in the many rear flat tubes (11a) connected to (10a) and reaches the left half of the rear lower header (12a).
The refrigerant further flows into the right half of the rear lower header section (12a), and in the many rear flat tubes (11a) connected to the right half of the rear lower header section (12a), this time, It passes through as an upflow and reaches inside the right half of the rear upper header section (10a). In the right half of the evaporator (1), since the front and rear header forming recesses (3) (3) of each intermediate plate (2) are connected to each other via the communication passage (19), Refrigerant moves from the right half of the rear upper header section (10a) to the right half of the front upper header section (10b) through these communication passages (19), and further, to the front upper header section (10b). 10b), passes through the inside of a large number of front flat tubes (11b), this time as a downward flow, and passes through the front lower header (12).
Reach inside the right half of b). The refrigerant further flows into the left half of the front lower header portion (12b), and the front lower header portion
Inside a number of front flat tubes (11b) connected to the left half of (12b),
This time, it passes through as a rising flow, reaches inside the left half of the front upper header section (10b), passes through the coolant discharge through hole (28) of the left end plate (20), and enters the inside of the flange (40) and the pipe end. The refrigerant is discharged to the outside via a refrigerant discharge passage (52) in the connection block (50).

Since the refrigerant flows as described above, in such a laminated type evaporator (1), the most amount is in the flat tube portion (11a) closest to the refrigerant introduction through hole (27) under the influence of gravity. Refrigerant flows, and the branch flow of the refrigerant tends to be uneven. However, according to the present invention, since the coolant introduction through-hole (27) is covered by the hemispherical plate-like coolant dispersion portion (60) having the plurality of small holes (60a), the coolant is variously orthogonal to the spherical surface. This allows the refrigerant to flow uniformly from the rear upper header portion (10a) to the rear flat tube portion (11a).

Note that, as shown in FIG.
The number of sets of (2) is, for example, 15 sets, and a partition wall section (16) is provided on a rear upper header section (10a) formed by a set of middle plates (2) at the center (FIG. 2). See))
The refrigerant flows in a meandering shape as a whole inside the evaporator (1), and is discharged to the outside from the refrigerant discharge pipe.

On the other hand, wind (air) is flowed from the front to the rear, and the flat tubes (1) adjacent to the stacked evaporator (1) are blown.
1) Between (11) or between flat tube (11) and end plate
(20) Passing through the gap where the corrugated fins (18) exist between (30), the refrigerant and the air are efficiently heat-exchanged through the wall surface of the intermediate plate (2) and the corrugated fins (18). Things.

According to the above-mentioned laminated evaporator (1), the flow of the refrigerant from the rear upper header portion (10a) to the rear flat tube portion (11a) is:
It can be adjusted by the shape of the refrigerant dispersion part (60) and the number of the small holes (60a). As a result, the flow of the refrigerant can be made uniform, and the heat exchange efficiency is greatly increased.

Here, the shape of the refrigerant dispersing portion can be variously changed so as to equalize the branch flow of the refrigerant. Examples are shown in FIGS.

The refrigerant dispersion part (61) shown in FIG. 5 is formed by removing the upper half part of the hemispherical plate-like refrigerant dispersion part (60) shown in FIG. The introduction through hole (27) has a plurality of evenly distributed small holes (61a), and is a quarter spherical plate-shaped refrigerant dispersion portion (61) that is convex in the refrigerant discharge direction.
Covered by According to this refrigerant dispersion part (61),
A large flow of refrigerant is blown out from the upper half of the through hole for refrigerant introduction (27), and a small flow of refrigerant is blown out from the lower half in various directions, and as a whole, the rear upper header (10a ) Is uniformly distributed from the refrigerant to the rear flat tube portion (11a).

The refrigerant dispersion portion (62) shown in FIG. 6 covers the lower half of the circular refrigerant introduction through-hole (27) and has a plurality of evenly arranged small holes (62a). It is plate-shaped. According to the refrigerant dispersion portion (62), the refrigerant blows out from each small hole (62a) in substantially the same direction, and the maximum reach distance of the refrigerant blown out from each small hole (62a) depends on the position of the small hole (62a). Is changed, and as a whole, the flow of the refrigerant from the rear upper header portion (10a) to the rear flat tube portion (11a) is made uniform.

In FIG. 7, a circular coolant introduction through hole (2
The outer peripheral edge of 7) is covered with an annular refrigerant dispersing portion (63) having a plurality of small holes (63a), and a nozzle-like refrigerant introducing portion (29) is formed at the center thereof. According to the present embodiment, a large flow rate of the refrigerant is blown out from the nozzle-shaped refrigerant introduction part (29), and the refrigerant is blown out in substantially the same direction from the small hole (63a) on the peripheral edge, and the small hole ( 63a) Depending on the position, the maximum reach distance of the refrigerant blown out from each small hole (63a) changes, and as a whole, the branch flow of the refrigerant from the rear upper header part (10a) to the rear flat tube part (11a) is reduced. Be uniformed.

In the above description, only an example in which the coolant dispersion portions (60), (61), (62), and (63) are provided in the coolant introduction through hole (27) has been described. A refrigerant dispersion part (60) (61) (6) having a plurality of small holes (60a) (61a) (62a) (63a) similar to
2) (63) may be provided, in short, the refrigerant dispersion part (60) (61)
If (62) and (63) are provided in at least one of the refrigerant introduction through-hole (27) and the refrigerant discharge through-hole (28), the flow of the refrigerant can be made uniform. The plurality of small holes (60a) (61a) (62a) (63a) may be, of course, evenly arranged, may be unevenly arranged, or may be provided so that each hole diameter is different. .

The illustrated laminated evaporator (1) has an intermediate plate
(2) is a type in which header parts (10) and (12) are provided on both the upper and lower sides, the stacked evaporator (1) according to the present invention is provided on one of the upper and lower sides of the intermediate plate (2) The same applies to the case of a type provided with a header portion.

Further, the laminated heat exchanger according to the present invention
It can be used not only for a car cooler evaporator but also for other uses such as an oil cooler, an after cooler, and a radiator.

Further, the laminated heat exchanger according to the present invention can be used as an evaporator constituting a refrigeration system. This embodiment is shown in FIG.

In FIG. 9, a refrigeration system (70) comprises an evaporator (71), a compressor (72), a condenser (73), a liquid receiver (74), a pressure reducer using the above-mentioned laminated heat exchanger. And a temperature-sensitive cylinder (76).

According to the refrigeration system (70), the gas-phase refrigerant is compressed by the compressor (72) to become a high-temperature and high-pressure gas-phase refrigerant and sent to the condenser (73), where the traveling wind and It is cooled by the fan and becomes a high-pressure liquid-phase refrigerant. The high-pressure liquid-phase refrigerant reaches the expansion valve (75) via the liquid receiver (74), and the expansion valve
After rapidly expanding in (75), it is sent to the evaporator (71). The degree of opening of the expansion valve (75) is adjusted by the temperature-sensitive cylinder (76), and when the refrigerant temperature at the outlet of the evaporator (71) is high, the flow rate of the refrigerant increases, which is required in the evaporator (71). When the refrigerant is too cold as described above, the flow rate of the refrigerant decreases. In the evaporator (71), the refrigerant deprives the surrounding heat and turns into a gaseous phase refrigerant.At the time of this vaporization, the refrigerant takes a large amount of heat to perform a cooling function, and again becomes a low-pressure gaseous phase refrigerant and is compressed. Return to the container (72). Evaporator (7
In 1), as described above, the coolant introduction through-hole (27) and / or the coolant discharge through-hole (28) provided in the end plate (20) have the coolant dispersion portions (60) (61) ( By being covered by (62) and (63), the refrigerant is effectively dispersed, whereby the entire system is also highly efficient.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a product of the present invention (a laminated heat exchanger and a laminated evaporator for a car air conditioner).

FIG. 2 is a schematic exploded perspective view of the invention.

FIG. 3 is an enlarged view of a main part of the end plate of the invention.

FIG. 4 is an enlarged side view of a main part of the invention, in which a part of the invention is cut away.

FIG. 5 is an enlarged view of a main part of an end plate showing a modification of the invention.

FIG. 6 is an enlarged view of a main part of an end plate showing another modification of the invention.

FIG. 7 is an enlarged view of a main part of an end plate showing still another modification of the invention.

FIG. 8 is a flow sheet schematically showing the entirety of the refrigerant flow path of the invention.

FIG. 9 is a block diagram showing a schematic configuration of a product (refrigeration system) of the present invention.

[Explanation of symbols]

 (1) Laminated heat exchanger (2) Intermediate plate (3) Upper cavity recess (4) Flat tube recess (8a) (8b) Refrigerant passage (fluid passage) (11) ... flat tube part (12a) (12b) ... front and rear upper header part (20) (30) ... end plate (27) ... refrigerant introduction hole (fluid introduction hole) (28) ... refrigerant discharge hole (fluid discharge hole) (60) (61) (62) (63) ... refrigerant dispersion part (fluid dispersion part) (60a) (61a) (62a) (63a) ... small hole (70) ... refrigeration system (71) ... evaporator ( 72)… Compressor (73)… Condenser (75)… Expansion valve (decompressor)

Claims (24)

[Claims] 1. An upper header forming part comprising a number of intermediate plates arranged in parallel, and end plates arranged on both left and right sides thereof, wherein each intermediate plate has a pair of front and rear fluid passage holes. A flat tube portion forming recess is provided, and a large number of intermediate plates are layered on top of each other with the recesses facing each other, so that a parallel flat tube portion and a plurality of flat tube portions are connected. A header portion is formed, and one of the left and right end plates is provided with a fluid introduction through hole communicating with one of the front and rear upper header portions and a fluid discharge through hole communicating with the other. In the heat exchanger, at least a part of at least one of the two through holes provided in the end plate is covered by a fluid dispersion portion having a plurality of small holes. Vessel. 2. The stacked heat exchanger according to claim 1, wherein one of the two through holes is covered with a fluid dispersion part. 3. The stacked heat exchanger according to claim 1, wherein both through holes are covered with a fluid dispersion portion. 4. The stacked heat exchanger according to claim 1, wherein the fluid dispersion unit is disposed in a lower half of each through hole. 5. The stacked heat exchanger according to claim 1, wherein the through hole covered by the fluid dispersion portion is circular, and the fluid dispersion portion is spherical. 6. The stacked heat exchanger according to claim 1, wherein the through hole covered by the fluid dispersion part is circular, and the fluid dispersion part is disk-shaped. 7. The stacked heat exchanger according to claim 1, wherein the through hole covered by the fluid dispersion portion is circular, and the fluid dispersion portion is annular in shape covering the periphery of the hole. 8. The stacked heat exchanger according to claim 7, wherein the central portion of the through hole has a nozzle shape. 9. An upper header forming part comprising a number of intermediate plates arranged in parallel, and end plates arranged on both left and right sides thereof, wherein each intermediate plate has a pair of front and rear refrigerant passage holes. A flat tube portion forming recess is provided, and a large number of intermediate plates are layered on each other with the recesses facing each other, so that the parallel flat tube portion and a plurality of flat tube portions are connected before and after. For a car air conditioner, a header portion is formed, and one of the left and right end plates is provided with a through hole for introducing a refrigerant communicating with an upper header portion on one of the front and rear sides and a through hole for discharging a refrigerant communicating with the other end. In the stacked evaporator, at least a part of at least one of the two through holes provided in the end plate is covered with a refrigerant dispersion portion having a plurality of small holes. Car laminated type evaporator for air conditioning. 10. The laminated evaporator for a car air conditioner according to claim 9, wherein one of the two through holes is covered with a refrigerant dispersion portion. 11. The laminated evaporator for a car air conditioner according to claim 9, wherein both of the through holes are covered with a refrigerant dispersion portion. 12. The laminated evaporator for a car air conditioner according to claim 9, wherein the refrigerant dispersing portion is disposed in a lower half portion of each through hole. 13. The laminated evaporator for a car air conditioner according to claim 9, wherein the through hole covered by the refrigerant dispersion part is circular, and the refrigerant dispersion part is spherical. 14. The laminated evaporator for a car air conditioner according to claim 9, wherein the through hole covered by the refrigerant dispersion part is circular, and the refrigerant dispersion part is disk-shaped. 15. The laminated evaporator for a car air conditioner according to claim 9, wherein the through hole covered by the refrigerant dispersion portion is circular, and the refrigerant dispersion portion is annular so as to cover a peripheral portion of the hole. 16. The laminated evaporator for a car air conditioner according to claim 15, wherein a central portion of the through-hole has a nozzle shape. 17. A refrigerant compressed by a compressor is condensed by a condenser, the condensed refrigerant is passed through a decompressor to reduce the pressure, and the decompressed refrigerant is evaporated by an evaporator having a refrigerant dispersing function to compress the refrigerant. The evaporator having a refrigerant dispersing function is provided with a number of intermediate plates arranged in parallel, and end plates arranged on both left and right sides of the evaporator. An upper header forming portion and a flat tube portion forming recess in which a pair of front and rear refrigerant passage holes are formed in the plate are provided, and a large number of intermediate plates are stacked in a layered manner with the recesses facing each other.
A parallel flat tube portion and a front and rear upper header portion for connecting the plurality of flat tube portions are formed, and one of the right and left end plates is the same as a refrigerant introduction through hole communicating with one of the front and rear upper header portions. In the refrigeration system, at least one of the two through holes provided in the end plate has a plurality of small holes. A refrigeration system characterized by being covered by a part. 18. The refrigeration system according to claim 17, wherein one of the two through-holes is covered with a refrigerant dispersion part. 19. The refrigeration system according to claim 17, wherein both of the through holes are covered with a refrigerant dispersion portion. 20. The refrigeration system according to claim 17, wherein the refrigerant dispersion section is disposed in a lower half of each through hole. 21. The refrigeration system according to claim 17, wherein the through-hole covered by the refrigerant distribution part is circular, and the refrigerant distribution part is spherical. 22. The refrigeration system according to claim 17, wherein the through hole covered by the refrigerant dispersion part is circular, and the refrigerant dispersion part is disk-shaped. 23. The refrigeration system according to claim 17, wherein the through-hole covered by the refrigerant distribution part is circular, and the refrigerant distribution part is annular in shape covering the periphery of the hole. 24. The refrigeration system according to claim 23, wherein the central portion of the through hole has a nozzle shape.