JP6913858B2 - Plate fin laminated heat exchanger and refrigeration system using it - Google Patents

Description

The present invention relates to a plate fin laminated heat exchanger and a refrigeration system using the same.

Generally, in a refrigerating system such as an air conditioner or a refrigerator, a refrigerant compressed by a compressor is circulated to a heat exchanger such as a condenser or an evaporator to exchange heat with a second fluid for cooling or heating. The heat exchange efficiency of the exchanger greatly affects the performance and energy saving of the system. Therefore, heat exchangers are strongly required to have high efficiency.

Under such circumstances, as the heat exchanger of a refrigeration system such as an air conditioner or a refrigerator, a fin tube type heat exchanger configured by penetrating a heat transfer tube through a fin group is generally used. Therefore, the heat exchange efficiency is being improved and the size is being reduced by reducing the diameter of the heat transfer tube.

However, since there is a limit to the reduction in diameter of the heat transfer tube, improvement of heat exchange efficiency and miniaturization are approaching the limit.

On the other hand, among the heat exchangers used for exchanging heat energy, a plate fin laminated heat exchanger formed by laminating plate fins having a flow path is known.

This plate fin laminated heat exchanger exchanges heat between the refrigerant flowing through the flow path formed in the plate fins and the second fluid flowing between the laminated plate fins, and the amount of refrigerant is small. It is used in an air conditioner for vehicles having a low refrigerant pressure (see Patent Document 1).

FIG. 11 shows a plate fin laminated heat exchanger described in Patent Document 1, and the heat exchanger 100 has a large number of plate fins 102 having a heat transfer flow path 101 (see FIG. 11) through which a refrigerant flows. The end plates 104 are laminated on both end faces of the laminated plate fin laminate 103, and the inflow side header flow path 105 and the outflow side header flow path 106 are formed at both left and right ends of the heat transfer flow path 101. ..

Utility Model Registration No. 3192719

In the plate fin laminated heat exchanger described in Patent Document 1, since the flow path 101 is formed by press-molding a concave groove in the plate fin 102, the cross-sectional area of the heat transfer flow path 101 is transferred to the fin tube type. It can be made smaller than a heat tube, and the heat exchange efficiency can be improved and the size can be reduced.

However, in the plate fin 102 of the plate fin laminated heat exchanger described in Patent Document 1, the header flow path 105 for inflow of the refrigerant flowing through the heat transfer flow path 101 and the header flow path 106 for outflow are the plate fin 102. Since it is provided separately on the left and right ends, the flow path length is short and the heat exchange efficiency between the refrigerant and air is low, and if the flow path length is to be lengthened, the length of the plate fin 102 is long. The size became large and the size became large.

Therefore, as shown in FIG. 12, the applicant collectively provides the refrigerant inflow and outflow header flow paths 105 and 106 on one end side of the plate fin 102, and makes a U-turn on the heat transfer flow path 101 on the other end side to flow out. As a configuration for connecting to the input header flow paths 105 and 106, the dimensions of the plate fins 102 are shortened while increasing the length of the heat transfer flow path 101 to improve the heat exchange efficiency between the refrigerant and air and at the same time promote further miniaturization. We are proposing what we can do.

In this case, the heat transfer forward flow path 101a connected to the inflow header flow path 105 by making a U-turn on the other end side of the plate fin 102 and the heat transfer return flow path 101b connected to the outflow header flow path 106 are adjacent to each other. Therefore, heat is transferred between both heat transfer channels 101a and 101b. Therefore, a heat insulating slit 107 is provided between the heat transfer flow path 101a and the heat transfer return flow path 101b to suppress heat transfer between the two to maintain high heat exchange performance.

However, if a heat insulating slit 107 is provided between the heat transfer flow path 101a and the heat transfer return flow path 101b, the portion of the plate fin 102 on the heat transfer flow path 101a side and the heat transfer return flow path 101b side The heat insulating slit 107 divides the fins over a wide area, and the plate fins 102 are likely to be distorted during pressing or brazing in the furnace, causing joint defects such as brazing defects, and there is a problem that the quality varies. rice field.

The present invention has been made in view of these points, and an object of the present invention is a high-quality, compact, high-performance plate fin laminated heat exchanger that prevents poor bonding and freezing using the same. To provide the system.

In order to achieve the above object, the heat exchanger constitutes a plate fin laminate by laminating a large number of plate fins having a plurality of heat transfer channels connected to a pair of inflow and outflow header channels. , A plate fin laminated heat exchanger in which end plates are joined and integrated on both end faces of a plate fin laminated body, and the plate fins are a pair of header flows by joining plates having a plurality of groove for forming a flow path. A heat transfer flow path connected to the path is formed, the heat transfer flow path is U-turned, and a pair of header flow paths connected to the heat transfer flow path are collectively provided on one end side of the plate fin, and the heat transfer is U-turned on the plate fin. A heat insulating slit is formed between the heat transfer flow path and the heat transfer return flow path, and a reinforcing bridge is provided in a part of the heat insulation slit to connect the heat transfer flow path side portion and the heat transfer return flow path side portion. The refrigeration system uses the plate fin laminated heat exchanger.

As a result, even if a heat insulating slit is provided between the heat transfer flow path side portion and the heat transfer return flow path side portion of the plate fin, the heat transfer forward flow path side portion and the heat transfer return flow path side portion are provided with the heat insulation slit. Since it is connected and integrated by the reinforcing ribs provided in a part, it is possible to prevent distortion during pressing and brazing in the furnace, and improve the quality by eliminating joint defects such as brazing defects. Can be made to.

Moreover, since the reinforcing bridge connecting the heat transfer flow path side portion and the heat transfer return flow path side portion is provided only in a part of the heat insulating slit, the heat transfer through the reinforcement bridge is very small. Most of the heat transfer between the heat transfer flow path and the heat transfer return flow path can be suppressed, and the heat exchange efficiency can be improved and the performance can be improved.

According to the above configuration, the present invention can prevent poor bonding and heat transfer, and can provide a high-quality, compact and high-performance plate fin laminated heat exchanger and a refrigeration system using the same. ..

A perspective view showing the appearance of the plate fin laminated heat exchanger according to the first embodiment of the present invention. An exploded perspective view of the plate fin laminated heat exchanger (A) (b) Top view of each plate constituting the plate fins of the plate fin laminated heat exchanger. A perspective view showing a laminated state of plate fins in the plate fin laminated heat exchanger. An exploded perspective view showing a laminated state of plate fins in the plate fin laminated heat exchanger. An exploded perspective view showing plate fins and end plates located on both end faces of the plate fin laminated heat exchanger. Enlarged cross-sectional view of the main part showing the joint state of the plate fins and the end plates located on both end faces of the plate fin laminated heat exchanger. The refrigerating cycle diagram of the air conditioner according to the second embodiment using the plate laminated heat exchanger of the present invention. Schematic cross-sectional view of the air conditioner Cross-sectional view of a conventional plate fin laminated heat exchanger Top view of plate fins in the conventional plate fin laminated heat exchanger Plan view of plate fins proposed by the applicant

The first invention is a heat exchanger, in which a large number of plate fins having a plurality of heat transfer flow paths connected to a pair of inflow and outflow header flow paths are laminated to form a plate fin laminate. A plate fin laminated heat exchanger in which end plates are joined and integrated on both end faces of the plate fin laminated body, and the plate fins are paired by joining plates having a plurality of flow path forming concave grooves. A heat transfer flow path connected to the header flow path of the above is formed, the heat transfer flow path is U-turned, and a pair of header flow paths connected to the heat transfer flow path are collectively provided on one end side of the plate fin, and the U of the plate fin is provided. A heat insulating slit is formed between the turned heat transfer outgoing flow path and the heat transfer return flow path, and a reinforcing bridge is provided in a part of the heat insulating slit to provide a heat transfer forward flow path side portion and the heat transfer return flow. The structure is such that the roadside part is connected.

As a result, even if a heat insulating slit is provided between the heat transfer flow path side portion and the heat transfer return flow path side portion of the plate fin, the heat transfer forward flow path side portion and the heat transfer return flow path side portion are provided with the heat insulation slit. Since it is connected and integrated by the reinforcing ribs provided in a part, it is possible to prevent distortion during pressing and brazing in the furnace, and improve the quality by eliminating joint defects such as brazing defects. Can be made to.

Moreover, since the reinforcing bridge connecting the heat transfer flow path side portion and the heat transfer return flow path side portion is provided only in a part of the heat insulating slit, heat transfer through the reinforcement bridge is extremely small. It can be limited to a small number, and most of the heat transfer between the heat transfer flow path and the heat transfer return flow path can be suppressed to improve the heat exchange efficiency and improve the performance.

In the second invention, in the first invention, the end plate has a structure in which a hole is provided in a portion of the plate fin facing the reinforcing bridge.

As a result, after brazing the plate fins and end plates in the furnace, a press blade can be inserted through the holes in the end frates to cut the reinforcing bridges of the plate fins, and heat transfer through the reinforcing bridges can be prevented and heat can be prevented. The exchange efficiency can be improved and the performance can be further improved.

Moreover, since the hole for cutting the reinforcing bridge is locally provided only in the portion facing the reinforcing bridge, the joint between the end plate and the heat insulating slit edge of the plate fin is firmly performed in the portion other than the hole. Therefore, it is possible to improve the workability of cutting the reinforcing bridge by forming a large hole provided in the end plate.

The third invention is a refrigeration system, in which the heat exchanger constituting the refrigeration cycle is a plate fin laminated heat exchanger according to the first or second invention.

As a result, this refrigeration system can be a high-performance refrigeration system with high quality and energy saving because the heat exchanger of the plate fin laminated heat exchanger is of high quality, small size, and high performance.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

The heat exchanger of the present disclosure is not limited to the configuration of the plate fin laminated heat exchanger described in the following embodiments, and has the same heat as the technical idea described in the following embodiments. It includes the configuration of the exchanger.

(Embodiment 1)
FIG. 1 is a perspective view showing the appearance of the plate fin laminated heat exchanger according to the first embodiment of the present invention, FIG. 2 is an exploded perspective view of the plate fin laminated heat exchanger, and FIGS. 3 (a) and 3 (b) are plates. A plan view of each plate constituting the plate fins of the fin laminated heat exchanger, FIG. 4 is a perspective view showing the laminated state of the plate fins in the plate fin laminated heat exchanger, and FIG. 5 is a perspective view showing the laminated state of the plate fins in the plate fin laminated heat exchanger. An exploded perspective view showing the laminated state of the plate fins, FIG. 6 is an exploded perspective view showing the plate fins and end plates located on both side end faces of the plate fin laminated heat exchanger, and FIG. 7 is an exploded perspective view showing both sides of the plate fin laminated heat exchanger. It is an enlarged cross-sectional view of the main part which shows the joint state of the plate fin located on the end face and the end plate.

As shown in FIGS. 1 and 2, in the heat exchanger 1 of the present embodiment, end plates 3a and 3b having substantially the same plan view are joined and integrated on both sides of a substantially bow-shaped plate fin laminate 2. It is composed of. A tube A4, which serves as an inlet when used as an evaporator and an outlet when used as a condenser, and a tube B5 which vice versa are provided on one end side of a substantially bow-shaped shape.

The end plates 3a and 3b on both sides of the plate fin laminated body 2 are brazed so as to sandwich the plate fin laminated portion, and both ends in the longitudinal direction are connected and fixed by fastening means 9 such as a bolt / nut or a caulking pin shaft. , Maintains rigidity as a heat exchanger.

Further, the plate fins 2a constituting the plate fin laminate 2 are a heat transfer flow in which a first fluid such as a refrigerant (hereinafter referred to as a refrigerant) flows by joining a pair of plates 6a and 6b shown in FIG. 3 by brazing or the like. It has a structure having a path, and as shown in FIGS. 4 and 5, a large number of layers are laminated to form a stacking interval in which a second fluid such as air (hereinafter referred to as air) flows between the plate fins 2a. .. Then, heat is exchanged between the refrigerant flowing through the heat transfer flow path provided in the plate fins 2a and the air flowing through the stacking gap between the plate fins 2a.

As shown in FIG. 5, the pair of plates 6a and 6b constituting the plate fins 2a have an opening 8a, which serves as a header flow path A8 and a header flow path B10 connected to the pipe A4 and the pipe B5 in one of the plates 6a. Ring-shaped concave grooves 8b and 10b provided at 10a and its opening edge, connecting flow path concave grooves 11a derived from ring-shaped concave grooves 8b and 10b, and diversion provided at the end of the connecting flow path concave groove 11a. A concave groove 12a for a road and a plurality of concave grooves 14a for forming a flow path that are branched and formed from the concave groove 12a for a branch flow path and are parallel to each other in a substantially U shape are provided.

On the other hand, the other plate 6b has openings 8c and 10c serving as header flow paths A8 and header flow paths B10, ring-shaped concave grooves 8d and 10d provided at the openings edges thereof, and concave grooves for connecting flow paths of the plate 6a. A groove 12b for branch flow path located at a portion facing the end portion of 11a and a plurality of concave grooves 14b for forming a flow path that are branched and formed from the concave groove 12b for branch flow path and are parallel to each other in a substantially U shape are provided. ..

The pair of plates 6a, 6b are formed by the ring-shaped concave grooves 8b, 10b and 8d, 10d provided at the openings 8a, 10a and 8c, 10c and the opening edges thereof, and the groove 12a and 12b for the branch flow path. The groove 14a and 14b for forming a flow path are joined by brazing so as to match each other, and the openings 8a, 10a, 8c, 10c and the ring-shaped concave grooves 8b, 10b, 8d, 10d at the edge of the opening are formed. The header flow path A8 and the header flow path B10 are formed, and the branch flow path 12a and 12b and the flow path forming concave grooves 14a and 14b form the branch flow path 12 and the heat transfer flow path 14, and the connecting flow path recess is formed. The groove 11a forms the connecting flow path 11.

The plate fins 2a of the plate fin laminate 2 having the above configuration form a stacking interval in which air flows by a plurality of protrusions 15 (see FIG. 3) appropriately provided along the longitudinal direction of the plate fins 2a.

Here, as shown in the overall view of the plate fins of FIG. 3, the heat transfer flow path 14 has a shape that is bent in a substantially bow shape and then makes a U-turn, similar to the outer shape of the plate fins 2a. A slit-shaped heat insulating slit 16 that prevents heat transfer between the heat transfer forward flow path 14-1 group connected to the header flow path A8 and the heat transfer return flow path 14-2 group connected to the header flow path B10. Is formed.

The heat insulating slit 16 is formed with reinforcing bridges 17 connecting the heat transfer outflow flow path 14-1 side portion and the heat transfer return flow path 14-2 side portion at a plurality of locations. That is, the heat insulating slit 16 is formed in a state where the plate fins 2a are in the state of parts, that is, when one plate fin 2a is used, reinforcing bridges 17 are left in several places in the longitudinal direction thereof, and heat transfer flow flows on both sides of the heat insulating slit 16. The passage 14-1 portion and the heat transfer return flow path 14-2 portion are connected.

On the other hand, as shown in FIG. 6, holes 18 are formed in the end plates 3a and 3b on both sides of the plate fin laminate 2 formed by laminating the plate fins 2a in a portion facing the reinforcing bridge 17. .. In this example, the header flow paths A8 and B10 for inflow and outflow, which have a large amount of heat transfer, are provided in several places on the side where the header flow paths A8 and B10 are provided. It may be provided so as to face all the reinforcing bridges 17 provided in the heat insulating slit 16 between the two.

Next, the operation and effect of the plate fin laminated heat exchanger configured as described above will be described.

Since the plate fin laminated heat exchanger of the present embodiment is provided with the heat insulating slit 16 between the heat transfer flow path 14-1 group and the heat transfer return flow path 14-2 group of the plate fin 2a. The heat transfer that occurs between the heat transfer flow path 14-1 group and the heat transfer return flow path 14-2 group can be suppressed, and the heat exchange efficiency can be improved to improve the performance.

Then, since several reinforcing bridges 17 are formed in the heat insulating slit 16 to connect the heat transfer forward flow path 14-1 group side portion and the heat transfer return flow path 14-2 group side portion, the plate. When the fins 2a and the end plates 3a and 3b are laminated, pressed and brazed in the furnace, it is possible to prevent the plate fins 2a from being distorted. Therefore, the brazing joint between the plate fins 2a and the end plates 3a and 3b can be ensured, and the quality can be stabilized by preventing joint defects such as brazing defects.

Further, since the reinforcing bridge 17 is provided only at several places of the heat insulating slit 16, the heat transfer through the reinforcing bridge 17 can be limited to a very small one, and the heat transfer flow path 14-1 and the heat transfer flow path 14-1. Most of the heat transfer to and from the heat transfer return flow path 14-2 can be suppressed. Therefore, the heat exchange efficiency can be improved and the performance can be improved.

Further, in the present embodiment, since the holes 18 are provided in the portions of the end plates 3a and 3b facing the reinforcing bridge 17, the plate fins 2a and the end plates 3a and 3b are brazed in the furnace and then the end frates. A press blade can be inserted through the holes 18 of 3a and 3b to cut the reinforcing bridge 17 of the plate fin 2a. As a result, heat transfer via the reinforcing bridge 17 can be prevented, heat exchange efficiency can be improved, and higher performance can be achieved.

In particular, in the present embodiment, the holes 18 of the end plates 3a and 3b are provided in several places on the side where the header flow paths A8 and B10 for inflow and outflow having a large amount of heat transfer are provided, so that heat is generated. The reinforcing bridge 17 of the heat insulating slit 16 near the header flow paths A8 and B10, which is greatly affected by the movement, is cut to prevent heat transfer. Therefore, it is possible to effectively prevent heat transfer between the heat transfer flow path 14-1 and the heat transfer return flow path 14-2, and improve the thermal efficiency.

Further, since the holes 18 of the end plates 3a and 3b have a local hole shape instead of a slit shape, the end plates 3a and 3b and the heat insulating slit edge portion of the plate fins 2a are brazed in the portion other than the holes 18. It will be firmly joined by brazing or the like, and the quality can be stabilized by ensuring the joining between the two. Moreover, since the joint between the end plates 3a and 3b and the heat insulating slit edge portion of the plate fin 2a is firmly performed, the holes 18 provided in the end plates 3a and 3b are formed in the heat insulating slit 16 as shown by X in FIG. Even if it is formed larger than the groove width, it does not affect the joint quality between the end plates 3a and 3b and the heat insulating slit edge of the plate fins 2a. Therefore, it is also possible to form the hole 18 to be large and enlarge the press blade to be inserted through the hole 18 to prevent the press blade from breaking and improve the workability of cutting the reinforcing bridge.

Further, since the heat exchanger of the present embodiment is formed by making a U-turn of the heat transfer flow path 14, the heat transfer flow path length is secured long while shortening the length of the plate fins 2a to ensure heat exchange performance. Can be enhanced. Therefore, the heat exchange performance can be improved by making the heat transfer flow path 14 U-turn, and the effect of reducing the heat loss due to heat transfer in the end plates 3a and 3b can be combined to make a higher performance heat exchanger. ..

In this embodiment, the holes 18 provided in the end plates 3a and 3b are provided in several places on the side where the header flow paths A8 and B10 for inflow and outflow having a large amount of heat transfer are provided. However, this may be provided in all the reinforcing bridges 17 provided in the heat insulating slit 16 so that all the reinforcing bridges 17 can be cut, and may be appropriately set according to the degree of heat transfer.

(Embodiment 2)
The second embodiment is an air conditioner configured by using the plate fin laminated heat exchanger according to the first embodiment.

FIG. 8 is a refrigeration cycle diagram of the air conditioner, and FIG. 9 is a schematic cross-sectional view showing the indoor unit of the air conditioner.

In FIGS. 8 and 9, the air conditioner is composed of an outdoor unit 51 and an indoor unit 52 connected to the outdoor unit 51. The outdoor unit 51 includes a compressor 53 for compressing the refrigerant, a four-way valve 54 for switching the refrigerant circuit during cooling and heating operation, an outdoor heat exchanger 55 for exchanging heat between the refrigerant and the outside air, a decompressor 56 for reducing the refrigerant, and an outdoor unit. A blower 59 is arranged. Further, the indoor unit 52 is provided with an indoor heat exchanger 57 for exchanging heat between the refrigerant and the indoor air, and an indoor blower 58. Then, the compressor 53, the four-way valve 54, the indoor heat exchanger 57, the decompressor 56, and the outdoor heat exchanger 55 are connected by a refrigerant circuit to form a heat pump type refrigeration cycle.

In the refrigerant circuit according to the present embodiment, a refrigerant in which tetrafluoropropene or trifluoropropene, difluoromethane or pentafluoroethane or tetrafluoroethane is used alone, or a mixture of two components or three components, respectively, is used.

The air conditioner having the above configuration switches the four-way valve 54 so that the discharge side of the compressor 53 and the outdoor heat exchanger 55 communicate with each other during the cooling operation. As a result, the refrigerant compressed by the compressor 53 becomes a high-temperature and high-pressure refrigerant and is sent to the outdoor heat exchanger 55 through the four-way valve 54. Then, it exchanges heat with the outside air to dissipate heat, becomes a high-pressure liquid refrigerant, and is sent to the decompressor 56. In the decompressor 56, the pressure is reduced to become a low-temperature low-pressure two-phase refrigerant, which is sent to the indoor unit 52. In the indoor unit 52, the refrigerant enters the indoor heat exchanger 57, exchanges heat with the indoor air, absorbs heat, evaporates and vaporizes, and becomes a low-temperature gas refrigerant. At this time, the indoor air is cooled to cool the room. Further, the refrigerant returns to the outdoor unit 51 and is returned to the compressor 53 via the four-way valve 54.

During the heating operation, the four-way valve 54 is switched so that the discharge side of the compressor 53 and the indoor unit 52 communicate with each other. As a result, the refrigerant compressed by the compressor 53 becomes a high-temperature and high-pressure refrigerant, passes through the four-way valve 54, and is sent to the indoor unit 52. The high-temperature and high-pressure refrigerant enters the indoor heat exchanger 57, exchanges heat with the indoor air to dissipate heat, and is cooled to become a high-pressure liquid refrigerant. At this time, the indoor air is heated to heat the room. After that, the refrigerant is sent to the compressor 56, decompressed in the compressor 56 to become a low-temperature low-pressure two-phase refrigerant, sent to the outdoor heat exchanger 55 to exchange heat with the outside air, evaporate and vaporize, and pass through the four-way valve 54. Then, it is returned to the compressor 53.

In the air conditioner configured as described above, the heat exchanger is compact, has high performance, and has high performance by using the heat exchanger shown in the above embodiment for the outdoor heat exchanger 55 or the indoor heat exchanger 57. Since it is of high quality, it can be an inexpensive, highly reliable and high-performance refrigeration system with high energy saving.

The plate fin laminated heat exchanger according to the present invention and the refrigeration system using the same have been described above using the above-described embodiment, but the present invention is not limited thereto. For example, the plate fin laminated heat exchanger has been described as a heat exchanger used in a refrigeration system, but the present invention is not limited thereto. That is, the embodiments disclosed this time are exemplary and not restrictive in all respects, and the scope of the present invention is indicated by the claims and has the same meaning and scope as the claims. All changes are included.

As described above, the present invention can provide a high-quality, compact and high-performance plate fin laminated heat exchanger and a refrigeration system using the same. Therefore, it can be widely used in heat exchangers and various refrigerating devices used for home and commercial air conditioners, and has great industrial value.

1 Heat exchanger 2 Plate fin laminate 2a Plate fin 3a, 3b End plate 4 Tube A
5 Tube B
6a plate 6b plate 8 header flow path A
8a, 8c Opening 8b, 8d Ring-shaped concave groove 9 Fastening means (bolts / nuts)
10 Header flow path B
10a, 10c Opening 10b, 10d Ring-shaped concave groove 11 Communication flow path 11a, 11b Concave groove for communication flow path 12-minute flow path 12a, 12b Concave groove for branch flow path 14 Heat transfer flow path 14-1 Heat transfer flow path 14-2 Heat transfer return flow path 14a Concave groove for flow path formation 14b Concave groove for flow path formation 15 Protrusion 16 Insulation slit 17 Reinforcing bridge 18 hole 51 Outdoor unit 52 Indoor unit 53 Compressor 54 Four-way valve 55 Outdoor heat exchanger 56 Decompressor 57 Indoor heat exchanger 58 Indoor blower

Claims (2)

A large number of plate fins having a plurality of heat transfer channels connected to a pair of inflow and outflow header flow paths are laminated to form a plate fin laminate, and end plates are joined and integrated on both end faces of the plate fin laminate. A plate fin laminated heat exchanger in which the plate fins join plates having a plurality of flow path forming concave grooves to form the heat transfer flow path connected to the pair of header flow paths, and the heat transfer flow path. As for the heat flow path, a pair of the header flow paths connected to the U-turn are provided together on one end side of the plate fin, and the U-turned heat transfer forward flow path and heat transfer return flow path of the plate fin are provided. A slit-shaped heat insulating slit is formed between the heat insulating slit and a reinforcing bridge is provided in a part of the heat insulating slit to connect the heat transfer forward flow path side portion and the heat transfer return flow path side portion, and the end plate. Is a plate fin laminated heat exchanger having a hole in a portion of the plate fin facing the reinforcing bridge. A refrigeration system in which the heat exchanger constituting the refrigeration cycle is the plate fin laminated heat exchanger according to claim 1.

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