WO2020129155A1

WO2020129155A1 - Heat exchanger and refrigeration cycle device

Info

Publication number: WO2020129155A1
Application number: PCT/JP2018/046562
Authority: WO
Inventors: 久登森田; 七種　哲二; アバスタリ
Original assignee: 三菱電機株式会社
Priority date: 2018-12-18
Filing date: 2018-12-18
Publication date: 2020-06-25
Also published as: CN216432657U

Abstract

The heat exchanger has a curved section in which a short diameter portion of a flat shaped heat transfer tube with a cross-section having a long diameter portion and the short diameter portion is the inside of the curve and comprises a side plate that is fixed to the heat transfer tube. The side plate has, along the direction that the heat transfer tube extends, a base plate portion and a low rigidity portion that is provided between the base plate portions and that is formed with a rigidity lower than the base plate portion, and is curved in an area that includes one site of the low rigidity portion.

Description

Heat exchanger and refrigeration cycle device

The present invention relates to a heat exchanger and a refrigeration cycle device.

BACKGROUND ART Conventionally, a heat exchanger including a heat transfer tube having a substantially flat cross section and a side plate has been known (for example, see Patent Document 1). The heat transfer tube and the side plate of the heat exchanger of Patent Document 1 have a linear shape.

JP, 2007-139376, A

In recent years, there is a demand for heat exchangers that achieve high efficiency of heat exchange and space saving. Since the heat exchanger having the flat heat transfer tube has the shape having the curved portion, it is possible to realize high efficiency of heat exchange and space saving. However, it is difficult to bend a heat exchanger having a flat heat transfer tube. For example, since a large force is applied when a heat exchanger having a flat heat transfer tube is bent, there is a problem that the heat exchanger has an abnormal deformation due to bending.

The present invention has been made in view of the above problems, and an object thereof is to obtain a heat exchanger having a bent portion in which the minor diameter portion of the flat heat transfer tube is inside the bend.

The heat exchanger according to the present invention has a bent portion in which the short-diameter portion of the flat-shaped heat-transfer tube having a cross-section having a short-diameter portion and a long-diameter portion is inside the bend, and the side plate fixed to the heat-transfer tube The side plate has a board portion and a low-rigidity portion formed between the board portions and having a rigidity lower than that of the board portion along the direction in which the heat transfer tube extends. It is bent in the region including the rigid portion.

Since the heat exchanger of the present invention is bent in a region including one low-rigidity portion of the side plate, it is possible to reduce the force applied when the heat exchanger is bent.

It is the figure which described typically the appearance when the outdoor unit of the refrigerating cycle device concerning Embodiment 1 of this invention is seen from the front. It is the figure which described the AA cross section of FIG. 1 typically. It is the figure which described typically the state before performing the bending process of the heat exchanger described in FIG. It is the figure which described typically the cross section of the heat transfer tube described in FIG. It is the modification 1 of FIG. It is the figure which described typically the external appearance when the heat exchanger described in FIG. 3 is seen from above. It is the modification 2 of FIG. It is the modification 3 of FIG. It is the modification 4 of FIG. It is the modification 5 of FIG. It is a modification 6 of FIG. It is a modification 7 of FIG. It is the figure which described the BB cross section of FIG. 12 typically. It is a modification 8 of FIG. It is the modification 9 of FIG. FIG. 16 is a diagram schematically showing the CC cross section of FIG. 15. It is the figure which described typically the state before performing the bending process of the heat exchanger which concerns on Embodiment 2 of this invention. FIG. 18 is a diagram schematically illustrating a DD cross section of FIG. 17. It is the modification 10 of FIG.

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same or corresponding parts will be denoted by the same reference numerals, and the description thereof will be appropriately omitted or simplified. Further, regarding the configuration shown in each drawing, the shape, size, arrangement, etc. can be appropriately changed within the scope of the present invention.

Embodiment 1.
[Refrigeration cycle device]

FIG. 1 is a diagram schematically showing the external appearance of an outdoor unit of a refrigeration cycle apparatus according to Embodiment 1 of the present invention when viewed from the front. FIG. 2 is a diagram schematically showing the AA cross section of FIG. As shown in FIGS. 1 and 2, the outdoor unit 100 of the example of this embodiment is connected to an indoor unit (not shown) by a refrigerant pipe to form a refrigeration cycle apparatus. The refrigeration cycle apparatus can be applied to a refrigeration apparatus that cools a cooling space such as a warehouse or an air conditioner that air-conditions a building or the like. As shown in FIG. 1, the outdoor unit 100 is a side-flow type outdoor unit 100 that blows out air in a substantially horizontal direction. As shown in FIG. 2, inside the outdoor unit 100, a heat exchange chamber 110 and a machine room 111 are formed. The machine room 111 is provided with a compressor and the like (not shown). The heat exchange chamber 110 is provided with the heat exchanger 10 and the blower 102. The blower 102 blows air to the heat exchanger 10. The blower 102 blows air to promote heat exchange between the blown air and the fluid flowing inside the heat exchanger 10. As shown in FIG. 1, a fan guard 103 that covers the blower 102 is provided in front of the blower 102.

[Heat exchanger]

As shown in FIG. 2, the heat exchanger 10 has headers 12 provided at both ends. The fluid that is heat-exchanged in the heat exchanger 10 flows in from one header 12 and flows out from the other header 12, for example. The heat exchanger 10 has a bent portion 180 in which the inner side 181 of the bend is concave and the outer side 182 of the bend is convex. The inside 181 of the bend is a portion where the curvature is large, and the outside 182 of the bend is a portion where the curvature is small. The heat exchanger 10 has a one-time bending shape having one bending portion 180.

FIG. 3 is a diagram schematically showing the state before bending the heat exchanger shown in FIG. 2. As shown in FIG. 3, the heat exchanger 10 includes a header 12, heat transfer tubes 14, fins 16 and side plates 18. The heat exchanger 10 of the example of this embodiment is an aluminum heat exchanger in which the header 12, the heat transfer tubes 14, the fins 16 and the side plates 18 are made of aluminum. The heat exchanger 10 in the example of this embodiment is not limited to the one formed of aluminum. The heat transfer tube 14 has a fluid flowing therein. The heat transfer tube 14 communicates with the inside of the header 12. The heat transfer tube 14 is brazed to the header 12 with the tip of the heat transfer tube 14 inserted into the header 12. A plurality of heat transfer tubes 14 are stacked along the stacking direction. The fluid flowing into one of the headers 12 flows through the plurality of heat transfer tubes 14 in parallel and flows out of the other header 12. That is, the heat exchanger 10 in the example of FIG. 3 is a parallel flow heat exchanger in which the fluid flows in parallel to the plurality of heat transfer tubes 14. The heat exchanger 10 of the example of this embodiment is not limited to the parallel flow heat exchanger.

FIG. 4 is a diagram schematically showing a cross section of the heat transfer tube shown in FIG. FIG. 5 is a first modification of FIG. As shown in FIG. 4, the heat transfer tube 14 has a flat cross section having a short diameter portion 14A and a long diameter portion 14B. The heat transfer tube 14 has a single flow path 14-1 inside. The heat transfer tube 14 may have a plurality of flow paths 14-2 inside, as shown in FIG.

The side plate 18 shown in FIG. 3 protects the heat transfer tubes 14 and the fins 16. The side plate 18 is a plate-shaped member provided so as to suppress deformation of the heat transfer tube 14 and the fins 16. The side plates 18 are provided, for example, on both sides of the heat transfer tube 14 in the stacking direction. The side plate 18 is fixed to the heat transfer tube 14 via the fin 16. The side plate 18 and the fin 16 are fixed by brazing, for example, and the fin 16 and the heat transfer tube 14 are fixed by brazing, for example. The side plate 18 may be fixed to the heat transfer tube 14 by brazing or the like without using the fin 16. Both ends of the side plate 18 are fixed to the header 12 by brazing or the like. Unlike the heat transfer tube 14, both ends of the side plate 18 are not inserted into the header 12. Both ends of the side plate 18 may be inserted into the header 12.

The fins 16 increase the heat exchange efficiency of the heat exchanger 10 by increasing the surface area for exchanging heat with the air. The fin 16 is, for example, a corrugated fin having a corrugated shape with continuous irregularities. The fins 16 are provided between the stacked heat transfer tubes 14 or between the heat transfer tubes 14 and the side plates 18.

FIG. 6 is a diagram schematically showing the external appearance of the heat exchanger shown in FIG. 3 when viewed from above. The side plate 18 has a substrate portion 18A and a low-rigidity portion 18B along the direction in which the side plate 18 extends, that is, the direction in which the heat transfer tube 14 extends. The low-rigidity portion 18B is provided between the substrate portion 18A and the substrate portion 18A. The low-rigidity portion 18B is formed to have a lower rigidity than the substrate portion 18A.

The heat exchanger 10 has a single-bent shape as shown in FIG. Specifically, the short diameter portion 14A shown in FIG. 4 is bent so as to be the inside 181 of the bend shown in FIG. The heat exchanger 10 is bent with the header 12, the heat transfer tubes 14, the fins 16 and the side plates 18 fixed. Therefore, when the heat exchanger 10 is bent, the stress obtained by adding the compressive stress generated on the inner side 181 of bending and the tensile stress generated on the outer side 182 of bending of each of the heat transfer tube 14, the fin 16 and the side plate 18 is applied. Occurs. The side plate 18 is a plate-shaped member having high rigidity as compared with the heat transfer tubes 14 and the fins 16, and therefore has a large force required for bending. Therefore, as shown in FIG. 6, an inner cutout 180-a and an outer cutout 180-b are provided in the low-rigidity portion 18B that serves as the bent portion 180 of the side plate 18. The inner notch 180-a has a notch shape provided in the bent inner side 181 of the side plate 18. The outer cutout 180-b has a cutout shape provided on the bent outer side 182 of the side plate 18. By providing the inner cutout 180-a, it is possible to reduce the compressive stress when the heat exchanger 10 is bent. By providing the outer cutout 180-b, the tensile stress when bending the heat exchanger 10 can be reduced.

As described above, in the heat exchanger 10 of the example of this embodiment, the cross section has the minor diameter portion 14A and the major diameter portion 14B, and the minor diameter portion 14A of the flat heat transfer tube 14 is bent inside 181. It has a section 180. The heat exchanger 10 includes a side plate 18 fixed to the heat transfer tube 14, and the side plate 18 is provided between the substrate portion 18A and the substrate portion 18A along the direction in which the heat transfer tube 14 extends. It has a low-rigidity portion 18B formed to have a rigidity lower than that of the portion 18A. Then, the heat exchanger 10 is bent in a region including one low-rigidity portion 18B. Since the heat exchanger 10 is bent in the region including the one low-rigidity portion 18B provided on the side plate 18, it is possible to reduce the stress acting when the heat exchanger 10 is bent. By reducing the stress that acts when the heat exchanger 10 is bent, it is possible to apply a load having an appropriate orientation or magnitude to the heat exchanger 10. By applying an appropriate load to the heat exchanger 10, the shape of the heat exchanger 10 can be made highly accurate. Further, by applying an appropriate load to the heat exchanger 10, it is possible to reduce the risk of damage to the heat exchanger 10 due to an abnormal force acting when the heat exchanger 10 is bent. Further, since the heat exchanger 10 has one low-rigidity portion 18B provided on the side plate 18, the bending position of the heat exchanger 10 is set to the low-rigidity portion 18B, and the shape of the heat exchanger 10 is changed. High accuracy can be achieved. Further, by providing the low-rigidity portion 18B only on the bent portion 180, the protection of the heat transfer tubes 14 and the fins 16 by the substrate portion 18A of the side plate 18 can be ensured.

Note that this embodiment is not limited to the one described above. For example, the substrate portion 18A and the low-rigidity portion 18B can be formed of different materials, and the rigidity of the low-rigidity portion 18B can be made lower than the rigidity of the substrate portion 18A.

Further, for example, FIG. 7 shows a modification 2 of FIG. Further, for example, FIG. 8 is a modification 3 of FIG. As shown in Modification 2 or Modification 3, the low-rigidity portion 18B may have the inner cutout 180-a or the outer cutout 180-b. As shown in FIG. 7, by providing the inner cutout 180-a, it is possible to reduce the compressive stress when the heat exchanger 10 is bent. As shown in FIG. 8, by providing the outer cutouts 180-b, the tensile stress when the heat exchanger 10 is bent can be reduced. When one of the inner cutout 180-a and the outer cutout 180-b is adopted, the inner cutout 180-a may be adopted when the purpose is to greatly reduce the stress. The reduction of stress when bending the heat exchanger 10 is because the effect of reducing the compressive stress is larger than the effect of reducing the tensile stress.

Further, for example, FIG. 9 is a modified example 4 of FIG. As shown in FIG. The low-rigidity portion 18B has a plurality of slits 180-c having cuts on the inside 181 of the bend of the side plate 18. It is preferable that the slits 180-c have a shape in which a gap is increased in a direction in which the heat exchanger 10 is bent before bending the heat exchanger 10 so as to be the inside 181 of the bending. By forming the slit 180-c and providing the low-rigidity portion 18B, the area for processing the side plate 18 can be reduced, so that the reduction of the strength of the side plate 18 can be suppressed and the side plate 18 can be suppressed. The processing cost can be reduced, and the reduction of the function of protecting the heat transfer tubes 14 and the fins 16 can be suppressed. In FIG. 9, an example in which the slit 180-c is provided in the portion of the inner cutout 180-a that is the inner side 181 of the bend has been described, but the inner cutout 180-a is omitted and the side plate 18 is omitted. Alternatively, only the slit 180-c may be provided in the portion that becomes the inner side 181 of the bend.

Further, for example, FIG. 10 shows a modified example 5 of FIG. FIG. 11 is a modification 6 of FIG. As shown in FIG. 10 or FIG. 11, the low-rigidity portion 18B has holes 180-d and 180-e provided in the side plate 18. The hole forming the low-rigidity portion 18B is, for example, as shown in FIG. 10, a long hole-shaped hole 180-d having a major axis along the direction in which the side plate 18 extends, or as shown in FIG. It is a hole 180-e having a long hole shape having a short diameter along the long side of the plate 18. The shape of the hole forming the low-rigidity portion 18B is not particularly limited, and may be, for example, an ellipse, a perfect circle, a rectangle, or the like. The hole forming the low-rigidity portion 18B may be one hole, but by having a structure having a plurality of holes, it is possible to appropriately disperse the force and obtain an appropriate strength.

Further, for example, FIG. 12 shows a modification 7 of FIG. FIG. 13 is a diagram schematically showing the BB cross section of FIG. As shown in FIG. 12, the low-rigidity portion 18B has a bellows-shaped portion 180-f provided on the side plate 18. By forming the low-rigidity portion 18B with the bellows-shaped portion 180-f, the protection of the heat transfer tubes 14 and the fins 16 by the side plate 18 can be ensured. The bellows-shaped portion 180-f is configured such that, when the heat exchanger 10 is bent, the interval between the peaks on the inside 181 of the side plate 18 is narrower than the interval between the peaks on the outside 182 of the bend of the side plate 18. It should be provided. By reducing the distance between the peaks on the inner side 181 of the side plate 18 when bending, the compressive stress when the heat exchanger 10 is bent is reduced. The widening of the crests on the outer side 182 of the bending of the side plate 18 reduces the tensile stress when the heat exchanger 10 is bent.

Further, for example, FIG. 14 is a modified example 8 of FIG. As shown in FIG. 14, the side plate 18 is formed to have a width smaller than that of the long diameter portion 14B of the heat transfer tube 14. By making the entire width of the side plate 18 narrow, the stress that acts when the heat exchanger 10 is bent can be reduced.

Further, for example, FIG. 15 shows a modification 9 of FIG. FIG. 16 is a diagram schematically showing the CC cross section of FIG. As shown in FIG. 15, the outdoor unit of the first embodiment may be a top flow type outdoor unit 100-1 which blows out air in a substantially vertical direction. The heat exchanger according to the first embodiment may be a heat exchanger 10-1 having a double bent shape having two bent portions 180 as shown in FIG. The device to which the heat exchanger of the first embodiment is applied is not limited to the outdoor unit, and may be an indoor unit (not shown). Further, the shape of the heat exchanger of the first embodiment is not limited to the single-bend shape or the double-bend shape, and may be a shape having three or more bends. Further, the fluid exchanged by the heat exchanger 10 is not limited to the refrigerant of the refrigeration cycle and may be a heat medium such as water or brine.

Also, for example, the modified examples of the first embodiment may be combined appropriately. For example, it may be configured to have the inner cutout 180-a of Modification 2 of FIG. 7 and the hole 180-d of Modification 5 of FIG.

Embodiment 2.

FIG. 17 is a diagram schematically showing a state before bending the heat exchanger according to the second embodiment of the present invention. FIG. 18 is a diagram schematically illustrating a DD cross section of FIG. 17, the same components as those in FIG. 3 are designated by the same reference numerals, and the description will be omitted or simplified. As shown in FIG. 3, in the heat exchanger 10 of the first embodiment, the side plate 18 and the header 12 are fixed. In the heat exchanger 10-2 according to the second embodiment, as shown in FIG. 17, a gap is provided between the side plate 18-1 and the header 12-1. The second embodiment has a configuration in which the side plate 18-1 and the header 12-1 are not fixed. Although the side plate 18-1 is bent toward the heat transfer tube 14 in FIG. 17, the bent portion of the side plate 18-1 facing the heat transfer tube 14 may be omitted. With the structure in which both ends of the side plate 18-1 and the header 12-1 are not fixed, the stress when the heat exchanger 10-2 is bent can be reduced. Further, by making the both ends of the side plate 18-1 and the header 12-1 not fixed, the stress acting on the header 12-1 or the heat transfer tube 14 when the heat exchanger 10-2 is bent is reduced. can do.

In the example of this embodiment, both ends of the side plate 18-1 and the header 12-1 are not fixed, and the header 12-1 is fixed only to the heat transfer tube 14. Since the header 12-1 is fixed only to the heat transfer tube 14, the fixing strength of the header 12-1 may be reduced. For example, if the fixing strength of the header is reduced, the header or the heat transfer tube 14 may be deformed. Therefore, in the example of this embodiment, as shown in FIG. 18, the header 12-1 has a thin portion 121 and a thick portion 122 formed to be thicker than the thin portion 121. The heat transfer tube 14 is connected to the thick portion 122. By configuring the heat transfer tube 14 to be connected to the thick portion 122, the fixing between the header 12-1 and the heat transfer tube 14 can be strengthened. Furthermore, since the rigidity of the header 12-1 is increased, the deformation of the header 12-1 can be suppressed.

Note that this embodiment is not limited to the one described above.

FIG. 19 shows a modification 10 of FIG. As shown in FIG. 19, the heat exchanger 10-3 of Modification 10 includes a reinforcing member 13. The reinforcing member 13 is for reinforcing the header 12-1, and is attached to the header 12-1. The reinforcing member 13 is attached to a portion of the header 12-1 where the heat transfer tube 14 is not attached. The reinforcing member 13 includes the header 12-1 and the end portion of the header 12-1 from the heat transfer pipe 14 connected to the header 12-1 closest to the end portion of the header 12-1 along the direction in which the reinforcing member 13 extends. Up to at least a part of. The reinforcing member 13 was connected to the header 12-1 at a position closest to the end of the header 12-1 from the end of the header 12-1 along the direction in which the header 12-1 and the reinforcing member 13 extend. It is preferable to extend to a position past the heat transfer tube 14. In the region where the heat transfer tube 14 or the side plate 18-1 of the header 12-1 is not fixed, the fixing strength of the header 12-1 may decrease. If the fixing strength of the header 12-1 is reduced, the header 12-1 or the heat transfer tube 14 may be deformed. Therefore, in Modification 10, the heat transfer pipe 14 connected to the header 12-1 is closest to the end of the header 12-1 along the direction in which the header 12-1 and the reinforcing member 13 extend from the heat transfer pipe 14 to the header 12-1. It is configured to have a reinforcing member 13 that reinforces at least a part up to the end portion. By providing the reinforcing member 13, deformation of the header 12-1 or the heat transfer tube 14 can be suppressed.

The present invention is not limited to the above embodiments, but can be variously modified within the scope of the present invention. That is, the configuration of the above-described embodiment may be appropriately improved, or at least a part of the configuration may be replaced with another configuration. Furthermore, the constituent elements that are not particularly limited in the arrangement are not limited to the arrangement disclosed in the embodiment, and can be arranged in a position where the function can be achieved.

For example, the second embodiment can be applied to the first embodiment. For example, the reinforcing member 13 of the second embodiment can be applied to the header 12 of the first embodiment.

Further, for example, the first embodiment can be applied to the second embodiment. For example, the low rigidity portion 18B of the first embodiment can be applied to the side plate 18-1 of the second embodiment.

10 heat exchangers, 10-1 heat exchangers, 10-2 heat exchangers, 10-3 heat exchangers, 12 headers, 12-1 headers, 13 reinforcing members, 14 heat transfer tubes, 14-1 flow paths, 14- 2 flow path, 14A short diameter part, 14B long diameter part, 16 fins, 18 side plate, 18-1 side plate, 18A substrate part, 18B low rigidity part, 100 outdoor unit, 100-1 outdoor unit, 102 blower, 103 fan Guard, 110 heat exchange room, 111 machine room, 121 thin part, 122 thick part, 180 bend part, 180-c slit, 180-d hole, 180-e hole, 180-f bellows shape part, 181 inside bend , 182 Outside the bend.

Claims

The cross-section has a bent portion where the short-diameter portion of the flat-shaped heat transfer tube having the short-diameter portion and the long-diameter portion is the inside of the bending,
With the heat transfer tube and a fixed side plate,
The side plate has a substrate portion along a direction in which the heat transfer tube extends, and a low-rigidity portion formed between the substrate portions and having a rigidity lower than that of the substrate portion,
A heat exchanger bent in a region including one of the low-rigidity portions.
The low-rigidity portion has an inner cutout provided inside the bend of the side plate.
The heat exchanger according to claim 1.
The heat exchanger according to claim 1 or 2, wherein the low-rigidity portion has an outer notch provided outside the bending of the side plate.
The heat exchanger according to any one of claims 1 to 3, wherein the low-rigidity portion has a plurality of slits having cuts inside a bend of the side plate.
The heat exchanger according to any one of claims 1 to 4, wherein the low-rigidity portion has a hole provided in the side plate.
The heat exchanger according to claim 1, wherein the low-rigidity portion has a bellows-shaped portion provided on the side plate.
The heat exchanger according to claim 6, wherein the bellows-shaped portion has a gap between ridges on the inside of bending of the side plate smaller than a gap on the outside of the bending of the side plate.
The heat exchanger according to any one of claims 1 to 7, wherein the side plate has a width narrower than that of the long diameter portion of the heat transfer tube.
A header having both ends of the heat transfer tube connected,
A gap is provided between the side plate and the header,
The heat exchanger according to any one of claims 1 to 8.
The header includes a thin portion and a thick portion formed to be thicker than the thin portion,
The heat exchanger according to claim 9, wherein the heat transfer tube is connected to the thick portion.
The heat exchanger according to claim 9, further comprising a reinforcing member that reinforces the header.
12. The reinforcing member reinforces at least a part from the heat transfer pipe connected to the header closest to the end of the header to the end of the header along a direction in which the header extends. The heat exchanger described in.
The heat exchanger according to claim 12, wherein the reinforcing member reinforces a region including the heat transfer pipe connected to the header, the region being closest to an end portion of the header along a direction in which the header extends.
The cross-section has a bent portion where the short-diameter portion of the flat-shaped heat transfer tube having the short-diameter portion and the long-diameter portion is the inside of the bending,
A side plate fixed to the heat transfer tube;
A header to which both ends of the heat transfer tube are connected,
A gap is provided between the side plate and the header,
Heat exchanger.
The header includes a thin portion and a thick portion formed to be thicker than the thin portion,
The heat exchanger according to claim 14, wherein the heat transfer tube is connected to the thick portion.
Provided between the heat transfer tube and the side plate, and having fins fixed to the heat transfer tube and the side plate,
The heat exchanger according to any one of claims 1 to 15.
A refrigeration cycle apparatus including the heat exchanger according to any one of claims 1 to 16.