JP2022162572A - Plate fin lamination type heat exchanger, and refrigeration system using the same - Google Patents

Abstract

To provide a plate fin lamination type heat exchanger light in weight and suppressing a water drop splashing phenomenon, and a refrigeration system using the same and having high reliability.SOLUTION: A heat exchanger is structured by laminating a plurality of plate fins 2a having header flow passes A11, B12 and a heat transfer flow pass 8 connecting the header flow passes. The plate fins 2a are structured by bonding two plates. A first plate 9 as one of the plates is in a flat plate state holding a strip shape. A second plate 10 as the other of them includes a heat transfer flow pass forming part 14 forming the heat transfer flow pass in a space between the first plate 9 and the second plate, and flat plate state end plate parts 15a, 15b provided to both longitudinal ends of the heat transfer flow pass forming part 14, and is structured by cutting 16 at least the plate both edge parts of the heat transfer flow pass forming part 14. Such structures above result in achieving weight reduction of the whole of the heat exchanger and also suppressing water droplet splash from a plate fin edge to improve reliability of the heat exchanger.SELECTED DRAWING: Figure 2

Description

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

Patent Literature 1 discloses a plate-fin laminated heat exchanger. This laminated plate-fin heat exchanger is constructed by laminating a plurality of plate fins each having a header channel and a heat transfer channel. The plate fins are constructed by brazing a pair of plates facing each other, and the first fluid such as refrigerant flowing into the heat transfer channel from one of the header channels flows into the other header channel serving as an outlet. heat exchange between the first fluid flowing through the heat transfer passages and the second fluid such as air flowing through the gaps between the plate fins.

JP 2018-66532 A

The present disclosure solves the problems caused by the conventional plate fin configuration and provides a lightweight and highly reliable plate fin laminated heat exchanger and a refrigeration system using the same.

A plate-fin laminated heat exchanger according to the present disclosure is a heat exchanger configured by stacking a plurality of plate fins each having a pair of header flow paths and a heat transfer flow path connecting the header flow paths. is constructed by joining two plates, one of the two plates is a flat plate that retains a strip shape, and the other second plate is between the first plate a heat transfer channel forming portion forming a heat transfer channel in the heat transfer channel forming portion; It has a configuration in which a portion is removed.

In the plate-fin laminate type heat exchanger according to the present disclosure, due to the above configuration, one of the plates constituting the plate fins cuts off at least both plate end portions of the heat transfer channel forming portion to reduce the flat portion. The weight of the heat exchanger as a whole can be reduced, and the thickness of the edge of the plate fins is reduced to the thickness of only one plate. It is possible to suppress the growth of water droplets that condense and adhere, and to suppress the water splashing phenomenon in which large water droplets are blown to a blower fan or the like on the downstream side. Also, it is possible to provide a highly reliable refrigeration system in which damage caused by water splashing from the heat exchanger is reduced.

1 is a perspective view showing the appearance of the plate-fin laminated heat exchanger according to Embodiment 1. FIG. A perspective view showing a plate fin laminate of the same plate fin laminate type heat exchanger. Fig. 2 is an exploded perspective view showing the plate fin lamination state of the same plate fin lamination type heat exchanger. FIG. 2 is an enlarged perspective view showing a main part of a plate fin laminate of the same plate fin laminate type heat exchanger; AA sectional view of FIG. BB sectional view of FIG. Explanatory diagram showing the dew condensation state of the same plate-fin laminated heat exchanger Explanatory drawing showing the air flow of the same plate-fin laminated heat exchanger The perspective view of the plate fins in another example of the plate fin laminated heat exchanger. A plan view of plate fins in still another example of the same plate-fin laminated heat exchanger. Refrigeration cycle diagram of an air conditioner shown as an example of a refrigeration system configured using the plate-fin laminated heat exchanger of Embodiment 1 Sectional view showing the indoor unit of the same air conditioner

(Knowledge, etc. on which this disclosure is based)
At the time when the inventors came up with the present disclosure, the plate fins of the plate fin laminate type heat exchanger consisted of two parts each having openings for header channels and grooves for heat transfer channels, as shown in Patent Document 1. It is constructed by brazing two plates facing each other. As a result, the plate fins have a shape in which two plates overlap each other, and the thickness of the plate fins becomes thicker. In addition, since the plate fins are thick, when the heat exchanger is used as a cooling heat source, condensed water adheres to the edge of the plate fins and grows into large water droplets that are installed downstream. There is also a problem that the air flies up to the blower fan, etc., and impairs the reliability of the heat exchanger-equipped equipment.

The present inventors have come to constitute the subject matter of the present disclosure in order to solve such problems.
□ Therefore, the present disclosure provides a plate-fin laminated heat exchanger that is lightweight and suppresses water splashing, and a refrigeration system using the same.

Hereinafter, embodiments will be described in detail with reference to the drawings. However, more detailed description than necessary may be omitted. For example, detailed descriptions of well-known matters or redundant descriptions of substantially the same configurations may be omitted. This is to avoid the following description from becoming more redundant than necessary and to facilitate understanding by those skilled in the art.

It should be noted that the accompanying drawings and the following description are provided to allow those skilled in the art to fully understand the present disclosure and are not intended to limit the claimed subject matter thereby.

(Embodiment 1)
Embodiment 1 will be described below with reference to FIGS. 1 to 8. FIG.

[1-1. Constitution]
As shown in FIG. 1, the heat exchanger 1 of the present embodiment includes end plates 3a and 3b having substantially the same shape in a plan view, which are integrally joined to both sides of a plate fin laminate 2 made up of strip-shaped plate fins 2a. configured. At one end thereof, there is provided a pipe A4 which is an inlet when used as a condenser and an outlet when used as an evaporator, and a pipe B5 which is vice versa.

The end plates 3a and 3b on both sides of the plate fin laminate 2 are joined by brazing while sandwiching the plate fin laminate 2, and both ends in the longitudinal direction are connected and fixed by fastening means 7 to form a heat exchanger. of rigidity.

In the plate fin laminate 2, as shown in FIG. 2, a first fluid such as a coolant (hereinafter referred to as a coolant) flows through a pair of header channels A11 and B12 to which the pipes A4 and B5 are connected. A large number of plate fins 2a having heat transfer channels 8 are laminated to form lamination intervals through which a second fluid such as air (hereinafter referred to as air) flows between the plate fins 2a. Heat is exchanged between the refrigerant flowing through the heat transfer passages 8 provided in the plate fins 2a and the air flowing through the gaps between the plate fins 2a.

Next, the construction of the plate fins 2a will be described in detail with reference to FIG.

The plate fins 2a of the present embodiment are configured by brazing a strip-shaped first plate 9 and a strip-shaped second plate 10, which is partially cut away.

The first plate 9 has header flow paths A11 and B12 to which the pipes A4 and B5 are connected on one end side, and a recessed groove portion 13 serving as a heat transfer flow path 8 connecting the header flow paths A11 and B12. and remains flat.

The second plate 10 has a heat transfer channel forming portion having, in addition to the header channels A11 and B12 similar to the first plate 9, groove portions forming heat transfer channels 8 between the first plate 9 and the groove portions 13 of the first plate 9. 14 and flat plate-shaped end plates 15a and 15b provided at both ends of the heat transfer channel forming portion 14 in the longitudinal direction. It has a configuration in which the flat plate portion of the edge portion is removed 16 . Then, fin lamination interval forming projections 17 are cut and raised on the remaining portions of the flat plate on both edges in the longitudinal direction so as to abut against the back surface of the first plate 9 and form an interval for air circulation between the plate fins 2a. There is. The strip-shaped first plate 9 and the second plate 10 are brazed to face each other to form the plate fins 2a having the header channels A11 and B12 and the heat transfer channels 8. As shown in FIG.

The plate fins 2a and the end plates 3a and 3b are made of aluminum or an aluminum alloy.

[1-2. motion]
Next, the effect of the laminated plate-fin heat exchanger constructed as described above will be described, taking as an example the case where it is used as a heat exchanger for an air conditioner.

In the heat exchanger 1 of the present embodiment, for example, when the heat exchanger 1 is used under condensing conditions, gas-phase refrigerant flows from the pipe A4 into the header flow path A11 on the inlet side of the plate-fin stack 2 . The vapor-phase refrigerant that has flowed into the header channel A11 flows while turning through the heat transfer channels 8 of the plate fins 2a, passes through the header channel B12 on the outlet side, and flows out from the tube B5 into the refrigerant circuit of the refrigeration system. . While flowing through the heat transfer channel 8, the gas-phase refrigerant exchanges heat with the air passing through the gaps between the plate fin stacks of the plate fin stack 2, and the vapor-phase coolant is sequentially liquefied and flows out from the header channel B12.

Here, the plate fins 2a of the plate fin laminate 2 are the first plate 9 and the second plate 10 which are joined by brazing. Since the portion is cut 16, the weight is reduced by the cut 16 of the flat plate portion. Therefore, the weight of the entire heat exchanger can be greatly reduced.

Further, when the heat exchanger with the above configuration is used under condensing conditions, that is, when used as a cooling source, the edge of the plate fin 2a with which the air passing through the plate fin lamination interval collides is Y in FIG. 4 and the right edge in FIG. As shown in the figure (the left figure shows the edges of the plate fins of the conventional two-ply type), the thickness of the first plate 9 alone is reduced. Therefore, even if the condensed water Z adheres to the edges of the plate fins 2a, the growth of the condensed water is suppressed, and it is possible to suppress the splashing phenomenon in which the condensed water forms large droplets and is blown to the blower fan or the like on the downstream side.

In addition, the stacking interval of the plate fins 2a without the flat plate portion of the second plate 10, that is, the flow path region portion X (see FIG. 2) where the heat transfer flow path forming portion 14 is formed is the plate of the first plate 9. As shown in the right diagram of FIG. 7B (the left diagram shows the edges of the plate fins of the conventional double-layered type), the stacking interval of the plate fins 2a becomes wider than when the two plates are joined with only the thickness. The flow resistance of air can be reduced and the performance can be improved. Further, in the above-described embodiment, the cutout 16 of the heat transfer channel forming portion 14 of the first plate 9 is limited to both edges in the longitudinal direction of the heat transfer channel forming portion 14. However, as shown in FIG. A flat plate portion between portions corresponding to the heat transfer flow paths 8 of the path forming portion 14 may also be removed 16 . The cutout 16 is formed by protruding pieces 18 intersecting the heat transfer channel 8 for forming fin lamination interval forming protrusions 17 (not shown) on both sides of the portion corresponding to the heat transfer channel 8 of the heat transfer channel forming portion 14 . It is also possible to leave a shape that protrudes in the direction of the arrow and cut it off 16 so that the entire structure has a substantially fishbone shape.

As a result, more flat plate-like portions can be removed, and the weight can be reduced more effectively.

In the present embodiment, the header channels A11 and B12 of the plate fins 2a are provided separately in the end plate portions 15a and 15b at both ends in the longitudinal direction. The header flow paths A11 and B12 may be collectively provided on the side of the end plate portion 15a. Also in the example of FIG. 2 and 3, as in Embodiment 1, the heat transfer channel forming portion 14 may be constructed by cutting 16 at least the flat plate portions of both longitudinal edge portions. By providing the header flow paths A11 and B12 collectively on the side of one end plate portion 15a in this manner, the connection with the piping on the side of the refrigeration system can be performed at one point, and workability can be improved. can.

In addition, although the concave groove shape forming the heat transfer channel 8 is provided on both the first plate 9 side and the heat transfer channel forming portion 14 side of the second plate 10, this is the first plate 9 side or the second plate 10 side. It may be provided on only one of the heat transfer channel forming portions 14 of the second plate 10 . Further, the fin lamination interval forming convex portion 17 may be provided on the flat plate portion side of the second plate 10 .

[1-3. effects, etc.]
As described above, the plate-fin laminated heat exchanger of the present disclosure has a plurality of laminated plate fins 2a each having a pair of header flow paths A11 and B12 and the heat transfer flow path 8 connecting the header flow paths A11 and B12. The plate fins 2a are formed by joining two plates, and one of the two plates, the first plate 9, is in a flat plate state holding a rectangular shape. , and the other second plate 10 includes a heat transfer channel forming portion 14 that forms a heat transfer channel between itself and the first plate 9, and flat plate-like ends provided at both ends of the heat transfer channel forming portion 14 in the longitudinal direction. It has plate portions 15a and 15b, and at least both end edge portions of the heat transfer path forming portion 14 are cut away 16. As shown in FIG.

As a result, the flat plate portion of one of the second plates 10 constituting the plate fins 2a is greatly reduced, so that the weight of the entire heat exchanger can be greatly reduced. Moreover, since the edge of the plate fin 2a is thinned by only the thickness of the first plate 9, the growth of water droplets condensed on the edge of the plate fin on the side into which the second fluid flows is suppressed. It is possible to suppress the phenomenon of water splashing, which becomes large water droplets and is blown by a blower fan or the like on the downstream side, thereby improving reliability.

Further, in the plate-fin laminated heat exchanger of the present disclosure, the second plate 10 has protruding pieces 18 protruding in a direction intersecting with the heat transfer channel portion on both sides of the heat transfer channel portion of the heat transfer channel forming portion 14. It is also possible to have a fish-bone configuration that is left and resected.

As a result, the flat portion of the second plate 10 can be reduced more effectively, so that the weight of the entire heat exchanger can be further reduced.

(Embodiment 2)
Embodiment 2 will be described below with reference to FIGS. 9 and 10. FIG.

[2-1. Constitution]
FIG. 9 is a refrigeration cycle diagram of an air conditioner configured using the plate-fin laminated heat exchanger according to Embodiment 1, and FIG. 10 is a schematic cross-sectional view showing an indoor unit of the air conditioner.

9 and 10, this air conditioner is composed of an outdoor unit 51 and an indoor unit 52 connected to the outdoor unit 51. As shown in FIG. The outdoor unit 51 includes a compressor 53 that compresses the refrigerant, a four-way valve 54 that switches the refrigerant circuit during cooling and heating operation, an outdoor heat exchanger 55 that exchanges heat between the refrigerant and the outside air, a pressure reducer 56 that reduces the pressure of the refrigerant, and an outdoor unit. A blower 59 is provided. Further, the indoor unit 52 is provided with an indoor heat exchanger 57 for exchanging heat between the refrigerant and indoor air, and an indoor fan 58 . Then, the plate fin laminated heat exchanger exemplified in Embodiment 1 is used as the indoor heat exchanger 57, and the compressor 53, the four-way valve 54, the indoor heat exchanger 57, the pressure reducer 56, and the outdoor heat exchanger 55 are used. They are connected by a refrigerant circuit to form a heat pump refrigeration cycle.

[2-2. motion]
The air conditioner configured as described above 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, high-pressure vapor-phase refrigerant and is sent to the outdoor heat exchanger 55 through the four-way valve 54 . Then, the refrigerant exchanges heat with the outside air, radiates heat, becomes a high-pressure liquid-phase refrigerant, and is sent to the pressure reducer 56 . In the decompressor 56 , the refrigerant is decompressed into 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 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 .

Condensed water produced by cooling the room air adheres to the edges of the plate fins of the indoor heat exchanger 57. However, since the thickness of the edges of the plate fins is thin, the fins do not grow into large water droplets. Water is collected along the surface to the water receiving gutter and discharged to the outside. Therefore, it is possible to prevent the indoor fan 58 from being damaged by the water splashing phenomenon, thereby improving the reliability of the air conditioner.

On the other hand, during heating operation, the four-way valve 54 is switched so that the discharge side of the compressor 53 and the indoor unit 52 are communicated. As a result, the refrigerant compressed by the compressor 53 becomes a high-temperature, 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, radiates 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 pressure reducer 56, is decompressed in the pressure reducer 56 to become a low-temperature low-pressure two-phase refrigerant, is sent to the outdoor heat exchanger 55, exchanges heat with the outside air, evaporates, and passes through the four-way valve 54. and returned to the compressor 53.

[2-3. effects, etc.]
Since the refrigeration system of the present disclosure uses the heat exchanger configured using the plate fins 2a shown in the first embodiment as the indoor heat exchanger 57, the water splash phenomenon from the heat exchanger can be prevented. It can be a refrigeration system with reduced and high reliability.

[Other embodiments]
As described above, the laminated plate-fin heat exchanger and the refrigeration system using the same according to the present invention have been described using the above embodiments, but the present invention is not limited to these, and various modifications and replacements can be made. , addition, omission, etc. can be performed. For example, the first fluid is the coolant and the second fluid is air, but the present invention is not limited to this. Also, although an air conditioner is exemplified as the refrigerating system, it may be a refrigerator, a refrigerating case, or the like, or may be a heat pump water heater using water as the second fluid. In other words, the embodiments disclosed this time are illustrative in all points and are not restrictive, and the scope of the present invention is indicated by the claims, and within the meaning and scope equivalent to the claims All changes are included.

INDUSTRIAL APPLICABILITY As described above, the present invention can provide a plate-fin laminated heat exchanger that is lightweight and has improved reliability by suppressing water splashing, and a highly reliable refrigeration system using the same. Therefore, it can be widely used for heat exchangers used in domestic and commercial air conditioners and various refrigeration equipment, and has great industrial value.

REFERENCE SIGNS LIST 1 heat exchanger 2 plate fin laminate 2a plate fins 3a, 3b end plates 4 tube A
5 Tube B
7 Fastening means (bolts and nuts)
8 heat transfer channel 9 first plate 10 second plate 11 header channel A
12 header channel B
14 heat transfer channel forming part 15a, 15b end plate part 16 cutting 17 convex part for forming fin lamination interval 18 projecting piece part 51 outdoor unit 52 indoor unit 53 compressor 54 four-way valve 55 outdoor heat exchanger 56 pressure reducer 57 indoor heat exchange vessel 58 indoor fan 59 outdoor fan

Claims (4)

A heat exchanger configured by stacking a plurality of plate fins having a pair of header channels and a heat transfer channel connecting the header channels, wherein the plate fins are configured by joining two plates, One of the two plates, a first plate, is in a flat plate state holding a strip shape, and the other second plate is a heat transfer channel forming portion that forms a heat transfer channel between itself and the first plate. and plate-like end plate portions provided at both longitudinal ends of the heat transfer channel forming portion, wherein at least plate end edge portions of the heat transfer channel forming portion are removed. 2. The plate-fin laminated heat exchanger according to claim 1, wherein the second plate is cut away leaving projecting pieces projecting in a direction intersecting the heat transfer channel on both sides of the portion corresponding to the heat transfer channel of the heat transfer channel forming portion. 3. A plate-fin laminated heat exchanger according to claim 1 or 2, wherein the pair of header flow paths are provided separately in each of the end plate portions at both ends of the heat transfer flow path forming portion, or collectively provided in either one of the end plate portions. A refrigeration system, wherein the heat exchanger is the plate fin laminated heat exchanger according to any one of the first to third items.

Images