JP6599023B2 - Heat exchanger, heat exchanger manufacturing method and fin assembly - Google Patents

Description

  The present invention relates to a heat exchanger, a heat exchanger manufacturing method, and a fin assembly.

  Air conditioners, heat pump water heaters, refrigerators, and the like include a heat exchanger as a component of the refrigeration cycle. The heat exchanger includes a fin having a plurality of flat plate portions and a refrigerant pipe thermally connected to the fin. The heat exchanger is configured such that outside air flows into the gap between the flat plate portions of the fins, and heat exchange occurs between the outside air and the refrigerant. The outside air is, for example, air blown by a blower.

  The heat exchanger of an air conditioner usually uses fins made of aluminum material with a thickness of about 0.1 mm, the pitch of the fins is about 1 to 2 mm, and the air speed of the gap between the fins is designed to be about 1 m / s. The In this case, the air flow in the gap between the fins is in a laminar flow state due to the low Reynolds number, and a temperature boundary layer is formed along the surface of the fin. When the thickness of the temperature boundary layer is large, heat convection due to the air flow is hindered, and the heat transfer rate from the fins to the outside air is reduced. As a result, the efficiency of heat exchange decreases.

  Thus, in order to improve the efficiency of heat exchange, it is necessary to thin the temperature boundary layer formed on the surface of the fin. Recently, to reduce the thickness of the temperature boundary layer, a heat exchanger has been proposed in which the outside air flow forms a vertical vortex and disturbs the temperature boundary layer when the outside air passes near the surface of the fin. Has been.

  For example, Patent Document 1 discloses a heat exchanger in which fins are formed in a wave shape in which peaks and valleys are alternately continuous. The fin is formed with a rising triangular piece and an opening by cutting a trough and bending a part of the trough in the step direction (one of the fin stacking directions). Patent Document 1 describes that a vertical vortex is generated when gas passes through the opening, and the vertical vortex can disturb the temperature boundary layer near the surface of the fin on the leeward side of the opening.

JP 2014-20580 A

  In the heat exchanger of patent document 1, the structure for supporting the rising triangular piece of a fin is not provided. For this reason, it is difficult to maintain the rising state of the rising triangular piece when an external force is applied or when the rigidity is lowered due to aging. If the rising state of the rising triangular piece collapses, the effect of disturbing the temperature boundary layer by the vertical vortex will be reduced.

  Further, the heat exchanger of Patent Document 1 is provided with a rising triangular piece bent in one of the lamination directions of the fins, but is not provided with a rising triangular piece bent in the other of the lamination directions. . In this case, even if a vertical vortex is generated in one of the fins in the stacking direction, no vertical vortex is generated in the other of the fins in the stacking direction. Therefore, the temperature boundary layer formed on the other side in the fin stacking direction cannot be disturbed.

  By the way, patent document 1 is not disclosing in detail about the molding method of a fin. The fin is usually formed by extruding an aluminum plate with a mold. When the rising triangular piece of Patent Document 1 is formed by extrusion molding, the aluminum plate extends at the bent portion. Therefore, it is necessary that the rising triangular piece has a size or shape that does not cause a cut or crack at the bent portion. There are manufacturing difficulties in increasing the size of the rising triangular piece or making the rising triangular piece elongated. For example, if the rising triangle piece is small, a large vertical vortex cannot be generated, so that the temperature boundary layer cannot be sufficiently disturbed.

  Thus, in the heat exchanger of patent document 1, the effect which disturbs a temperature boundary layer is not enough, and it is also difficult to maintain the effect which disturbs a temperature boundary layer. As a result, the formed temperature boundary layer becomes thick, and the heat exchange performance of the heat exchanger is lowered.

  This invention is made | formed in view of the said situation, and aims at providing the heat exchanger etc. which can make heat exchange performance high.

In order to achieve the above object, a heat exchanger according to the present invention comprises:
A fin having a plurality of parallel plate portions and thermally connected to the refrigerant pipe;
A metal wire penetrating at least one of the plurality of flat plate portions;
With
At least one of the plurality of flat plate portions has a first bent shape portion bent in one of the stacking directions and a second bent shape portion bent in the other of the stacking directions,
The first bent shape portion and the second bent shape portion are aligned with each other when the plurality of flat plate portions are viewed in plan, and are supported by the metal wire.

  According to the present invention, vertical vortices are generated on both sides of the flat plate portion of the fin by the first bent shape portion and the second bent shape portion. Further, the vertical vortex becomes large due to the interference with the metal wire. Therefore, the effect of disturbing the temperature boundary layer is improved. Since the first bent shape portion and the second bent shape portion are supported by the metal wire, the bent state of the first bent shape portion and the second bent shape portion is maintained. Therefore, the effect of disturbing the temperature boundary layer can be maintained. Since the effect of disturbing the temperature boundary layer is improved, the formed temperature boundary layer becomes thinner. Therefore, according to this invention, the heat exchanger etc. which can make heat exchange performance high can be provided.

The figure which shows the external appearance of the heat exchanger which concerns on 1st Embodiment. The fragmentary perspective view of the heat exchanger which concerns on 1st Embodiment. Conceptual diagram showing heat transfer between flat plates of a fin according to a comparative example The conceptual diagram which shows the heat transfer between the flat plates of the fin which concerns on 1st Embodiment. The flowchart which shows the manufacturing method of the heat exchanger which concerns on 1st Embodiment. The perspective view which shows the cutting process of the fin which concerns on 1st Embodiment The perspective view which shows the 1st bending formation process of the fin which concerns on 1st Embodiment. The perspective view which shows the 2nd bending formation process of the fin which concerns on 1st Embodiment. The fragmentary perspective view of the heat exchanger which concerns on 2nd Embodiment. The perspective view which shows the cutting process of the fin which concerns on 2nd Embodiment The figure which shows the external appearance of the heat exchanger which concerns on 3rd Embodiment

  Hereinafter, a heat exchanger, a heat exchanger manufacturing method, and a fin assembly according to an embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
First, the structure of the heat exchanger 1 which concerns on this embodiment is demonstrated. FIG. 1 is a perspective view when the heat exchanger 1 is viewed from the windward side, and an arrow 40 indicates a direction in which outside air flows when the heat exchanger 1 is used.

  The heat exchanger 1 includes a fin 10 for transferring heat to the outside air, and a metal wire 30 that penetrates the fin 10. For example, a blower (not shown) is arranged in front of the fins 10 and the outside air flows in the direction of the arrow 40 when the blower blows from the front to the back.

  The fin 10 has a plurality of flat plates 11 arranged in parallel at a constant pitch. The flat plate 11 is made of a metal material having a high heat transfer coefficient such as copper or aluminum. The plurality of flat plates 11 have a first bent shape portion 12 bent to one side in the stacking direction and a second bent shape portion 13 bent to the other side in the stacking direction at the windward edge. ing. In the present embodiment, the flat plate 11 forms a flat plate portion. In addition, since the thickness of the flat plate 11 is thin, it is indicated by a single line in the accompanying drawings of the present application.

  The refrigerant pipe 20 passes through the plurality of flat plates 11 of the fin 10. Thereby, the fin 10 is thermally connected to the refrigerant pipe 20. Note that the refrigerant flows inside the refrigerant pipe 20. With this configuration, the refrigerant exchanges heat with the outside air via the fins 10.

  In the refrigerant pipe 20, the refrigerant flows in from the inflow part 21, passes through the turning part 22, and flows out from the outflow part 23. The refrigerant pipe 20 is connected to the condenser and the evaporator, and the refrigerant flowing out from the outflow portion 23 returns to the inflow portion 21 through a condenser, an evaporator, a compressor, an expansion valve, and the like (not shown). A refrigeration cycle is formed by such circulation of the refrigerant.

  The metal wire 30 is an elongated linear member and is made of a metal material such as copper or aluminum. The metal wire 30 supports the first bent shape portion 12 and the second bent shape portion 13. The metal wire 30 has a length suitable for penetrating the plurality of flat plates 11.

  Hereinafter, the detailed positional relationship among the metal wire 30, the first bent shape portion 12, and the second bent shape portion 13 will be described with reference to FIG. 2. For ease of understanding, FIG. 2 shows only one flat plate 11 and metal wire 30 among the components of the heat exchanger 1, and other components are omitted.

  At the edge on the windward side of the flat plate 11 (that is, the inflow position of outside air), the first bent shape portion 12 is bent in one of the stacking directions (downward in the figure), and the second bent shape portion 13 is stacked. It is bent in the other direction (downward in the figure). Moreover, the 1st bending shape part 12 and the 2nd bending shape part 13 are mutually located in a line when the several flat plate 11 is planarly viewed, and are in the state which mutually separated the front-end | tip.

  The metal wire 30 is inserted between the first bent shape portion 12 and the second bent shape portion 13 and brazed. Thereby, the metal wire 30 supports the first bent shape portion 12 and the second bent shape portion 13. The flat plate 11 is provided with four openings 15 through which the refrigerant pipe 20 passes.

  The configuration of the heat exchanger 1 has been described above. Hereinafter, the function of the heat exchanger 1 having such a configuration will be described.

  First, as shown in FIG. 2, when the outside air flows in the direction of the arrow 40, the direction of the outside air at the edge on the windward side of the flat plate 11 is the first bent shape portion 12 and the second bent shape portion 13. Disturbed by. As a result, a longitudinal vortex S is generated on the leeward side from the first bent shape portion 12 and the second bent shape portion 13. Further, the vertical vortex S becomes larger due to interference with the metal wire 30.

  On the other hand, in the region that does not interfere with the first bent shape portion 12 and the second bent shape portion 13, no vertical vortex S is generated on the leeward side. For example, outside air flows along the surface of the flat plate 11 on the right side in the drawing from the first bent shape portion 12 and on the left side in the drawing from the first bent shape portion 12.

  Here, how the flow of the outside air affects the heat transfer from the flat plate 11 to the outside air will be described. Hereinafter, the fin 10 according to the present embodiment will be described in comparison with a fin according to a comparative example in which the flat plates 91 are simply arranged in parallel at a constant pitch.

  FIG. 3 is a conceptual diagram showing heat transfer between the flat plates 91 of the fin according to the comparative example. In this figure, only one flat plate 91 of the fin is taken out and viewed from a direction perpendicular to the flat plate 91. Strictly speaking, although the plurality of flat plates 91 are stacked from the front to the back of the sheet, only one of the flat plates 91 is focused in this figure.

  Here, when the outside air flows in the direction of the arrow 40, the outside air flows along the surface of the flat plate 91. As a result, a thin temperature boundary layer is formed in the vicinity of the windward edge of the flat plate 91. Therefore, a region A1 indicated by a one-dot chain line is a region having a high heat transfer rate to the outside air. On the other hand, a thick temperature boundary layer is formed on the leeward side from the region A1. Therefore, the region on the leeward side from the region A1 is a region having a low heat transfer rate to the outside air.

  In addition, the region A1 is a region where the temperature boundary layer gradually becomes thicker toward the leeward side, and the region on the leeward side from the region is a region where the thickness of the temperature boundary layer is saturated.

  FIG. 4 is a conceptual diagram showing heat transfer between the flat plates 11 of the fin 10 according to the present embodiment. Compared with the region A1 of the comparative example shown in FIG. 3, the region A2 indicated by the alternate long and short dash line in FIG. 4 extends to the leeward side. This is because the temperature boundary layer is thinned by the vertical vortex S disturbing the temperature boundary layer.

  As described above, according to the heat exchanger 1 according to the present embodiment, the vertical vortex S is generated on both sides of the flat plate 11 of the fin 10 by the first bent shape portion 12 and the second bent shape portion 13. To do. Further, the vertical vortex S becomes large due to the interference with the metal wire 30. Therefore, the effect of disturbing the temperature boundary layer is improved. Since the first bent shape portion 12 and the second bent shape portion 13 are supported by the metal wire 30, the bent state of the first bent shape portion 12 and the second bent shape portion 13 is maintained. The Therefore, the effect of disturbing the temperature boundary layer can be maintained. Since the effect of disturbing the temperature boundary layer is improved, the formed temperature boundary layer becomes thinner. Therefore, according to the heat exchanger 1, the heat exchange performance can be increased.

  So far, the configuration and function of the heat exchanger 1 have been described. Hereinafter, the manufacturing method of the heat exchanger 1 which has the said structure is demonstrated.

  As shown in FIG. 5, first, the manufacturing process of the flat plate 11 is performed (step S100). In this step, the flat plate 11 having the opening 15 is manufactured using a mold. A metal material such as copper or aluminum is used for the flat plate 11.

  Next, the notch process which provides the notch 14 in the flat plate 11 of the fin 10 is performed (step S101). In this step, as shown by a one-dot chain line in FIG. The cut 14 includes a linear cutting line parallel to the edge of the flat plate 11 and a linear cutting line forming an acute angle with the edge of the flat plate 11.

  Next, a first bend forming step is performed (step S102). In this step, as shown in FIG. 7, a part of the flat plate 11 is bent to one side in the stacking direction (upward in the drawing) from the cut 14 provided by the cutting step by two press-formed portions. (That is, the first bent shape portion 12 and the second bent shape portion 13) are formed.

  Next, an assembly process for assembling the heat exchanger 1 is performed (step S103). In this step, the plurality of flat plates 11 formed with two bent portions are arranged in parallel, and the refrigerant pipe 20 is inserted into the opening 15.

  Next, a second bend forming step is performed (step S104). In this step, as shown in FIG. 8, the metal wire 30 is pushed into the first bent shape portion 12 out of the two bent shape portions formed by the first bent forming step, and the first bent shape is thus obtained. The part 12 is bent to the other side in the stacking direction (downward in the figure). In FIG. 8, the refrigerant pipe 20 is not shown.

  Here, in the second bend forming step, when the metal wire 30 is thin, the metal wire 30 is protected from being cut or bent by a jig when the metal wire 30 is pushed. In this case, the jig is removed after the metal wire 30 penetrates the plurality of flat plates 11. In addition, if the metal wire 30 is a thick rod shape, it is not necessary to use a jig. The metal wire 30 may be cut in advance to a length suitable for penetrating the plurality of flat plates 11, or may be cut after penetrating the plurality of flat plates 11.

  Next, a brazing process is performed (step S105). In this step, the metal wire 30 is moved so as to be held between the first bent shape portion 12 and the second bent shape portion 13 of the flat plate 11, and the metal wire 30 is moved to the first bent shape portion 12 and the second bent shape portion 12. The second bent shape portion 13 is brazed. In addition, you may braze to all the some flat plates 11, and may braze only to some flat plates 11. FIG.

  According to such a manufacturing method, the heat exchanger 1 can be easily manufactured. For example, in the second bend forming step, the first bent shape portion 12 can be bent when the metal wire 30 penetrates the flat plate 11. Therefore, there is no need to separate the step of passing the metal wire 30 through the flat plate 11 and the step of bending the first bent shape portion 12.

(Second Embodiment)
Hereinafter, the heat exchanger 2 according to the second embodiment of the present invention will be described in detail with reference to the drawings. In addition, in the heat exchanger 2 which concerns on this embodiment, the same code | symbol is attached | subjected to the component which is common in the heat exchanger 1 which concerns on 1st Embodiment.

  In the heat exchanger 1 according to the first embodiment, the first bent shape portion 12 and the second bent shape portion 13 are arranged at the edge of the flat plate 11. On the other hand, in the heat exchanger 2 according to the present embodiment, the first bent shape portion 52 and the second bent shape portion 53 are arranged in the central portion of the flat plate 51, as shown in FIG. . In the present application, the “central portion” means a region not including an edge portion, and does not mean only the center position or the center of gravity position.

  In the manufacturing method of the heat exchanger 2 according to the present embodiment, a Z-shaped notch 54 is made at the central portion of the flat plate 51 in the notching step, as indicated by a one-dot chain line in FIG. The notch 54 connects two straight cutting lines parallel to the edge of the flat plate 51 and one end and the other end of the two cutting lines, and forms a sharp angle with the edge of the flat plate. And consist of Processes other than the cutting process are the same as the manufacturing method of the heat exchanger 1 according to the first embodiment.

  As in the comparative example shown in FIG. 3, a thin temperature boundary layer is formed at the windward edge of the flat plate 91 without the first bent shape portion 12 and the second bent shape portion 13. On the other hand, according to the first embodiment shown in FIG. 4, the temperature boundary layer on the leeward side from the first bent shape portion 12 and the second bent shape portion 13 is thinned. In other words, the first bent shape portion 12 and the second bent shape portion 13 do not contribute to thinning of the temperature boundary layer in the vicinity of the windward edge of the flat plate 11 on which the originally thin temperature boundary layer is formed.

  On the other hand, in the present embodiment, the first bent shape portion 52 and the second bent shape portion 53 are located in the central portion of the flat plate 51, and the first bent shape portion 12 and the first bent shape portion 12 of the first embodiment. It is formed at a position farther from the edge of the flat plate 51 than the second bent shape portion 13. Therefore, according to the heat exchanger 2 which concerns on this embodiment, compared with the heat exchanger 1 which concerns on 1st Embodiment, the area | region where a temperature boundary layer is thinned can be extended to the leeward side.

(Third embodiment)
Hereinafter, the heat exchanger 3 according to the third embodiment of the present invention will be described in detail with reference to FIG. In addition, in the heat exchanger 3 which concerns on this embodiment, the same code | symbol is attached | subjected to the component which is common in the heat exchanger 1 which concerns on 1st Embodiment.

  The heat exchanger 3 according to the present embodiment is different from the heat exchanger 1 of the first embodiment in that it includes two metal wires 31 and 32 that penetrate the fins 10. The metal wire 31 is inserted so as to support the second bent shape portion 13 and brazed to the second bent shape portion 13. The metal wire 32 is inserted so as to support the first bent shape portion 12 and brazed to the first bent shape portion 12.

  According to the heat exchanger 3 according to the present embodiment, the metal wire 31 and the metal wire 32 support the first bent shape portion 12 and the second bent shape portion 13, respectively. Therefore, compared with the heat exchanger 1 according to the first embodiment, the effect of maintaining the bent state of the first bent shape portion 12 and the second bent shape portion 13, that is, the effect of disturbing the temperature boundary layer is maintained. Increases effectiveness. Moreover, since the two metal wires 31 and 32 are provided, the effect of increasing the vertical vortex S is enhanced.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation and application are possible in the range which does not deviate from the summary of this invention.

(Modification)
In the heat exchangers 1, 2, and 3 according to the embodiment, the first bent shape portions 12 and 52 and the second bent shape portions 13 and 53 are formed on all of the plurality of flat plates 11 and 51, and the plurality of flat plates are formed. The metal wires 30, 31, and 32 penetrate through all of 11 and 51. However, the present invention is not limited to such a configuration.

  For example, the first bent shape portions 12 and 52 and the second bent shape portions 13 and 53 may be formed on only some of the flat plates 11 and 51 among the plurality of flat plates 11 and 51. The metal wires 30, 31 and 32 may penetrate only some of the flat plates 11 and 51. That is, the metal wires 30, 31 and 32 do not have to penetrate the fin 10.

  In the heat exchangers 1 and 3 according to the first embodiment and the third embodiment, the first bent shape portions 12 and 52 and the second bent portions are provided on the windward edge of the flat plates 11 and 51 (that is, the outside air inflow position). Bent portions 13 and 53 are formed. However, the first bent shape portions 12 and 52 and the second bent shape portions 13 and 53 may be formed at the leeward side edge portions of the flat plates 11 and 51 (that is, the outside air outflow position). In this case, for example, when another heat exchanger or a fin is disposed on the leeward side of the heat exchangers 1 and 3, the temperature boundary layer formed on the other heat exchanger or the fin is thinned. can do.

  In the heat exchangers 1, 2, and 3 according to the embodiment, the metal wires 30, 31, and 32 are brazed to the flat plates 11 and 51. However, the heat exchangers 1, 2, and 3 do not have a configuration in which the metal wires 30, 31, and 32 are brazed, and the metal wires 30, 31, and 32 are the first bent portions 12 of the flat plates 11 and 51. , 52 and the second bent shape portions 13 and 53 may be in contact with each other. In this case, the metal wires 30, 31, and 32 support the first bent shape portions 12 and 52 and the second bent shape portions 13 and 53 by contact.

  In this case, the metal wires 30, 31, and 32 do not need to contact all of the first bent shape portions 12 and 52 and the second bent shape portions 13 and 53 of the plurality of flat plates 11 and 51. . The metal wires 30, 31, 32 may be in contact with the first bent shape portions 12, 52 and the second bent shape portions 13, 53 of some of the flat plates 11, 51.

  In the said embodiment, the fin 10 has the several flat plates 11 and 51 arranged so that it may parallel with a fixed pitch. Therefore, the flat plates 11 and 51 form a flat plate portion. However, the present invention is not limited to such a configuration.

  For example, the fin 10 may not be configured to include the plurality of flat plates 11 and 51 but may be configured by bending a single flat plate into a square wave shape, a triangular wave shape, or the like. For example, it may be configured like a corrugated fin. In this case, portions of the fin 10 other than the bent portion of the flat plate form a plurality of flat plate portions.

  In the above embodiment, the heat exchangers 1, 2, and 3 that perform heat exchange between the outside air and the refrigerant have been described, but the present invention is not limited to this. For example, the heat exchangers 1, 2, and 3 may be a fin assembly in which the fin 10 and the metal wires 30, 31, and 32 are assembled. In the heat exchangers 1, 2, and 3, the fin assembly may be in a state before being thermally connected to the refrigerant pipe 20, or may be configured not to be thermally connected to the refrigerant pipe 20. .

  The fin assembly is not limited to the heat exchangers 1, 2, and 3 that are thermally connected to the refrigerant pipe 20, and can be widely applied. For example, this fin assembly may be applied as a heat sink for heat dissipation of an electronic circuit board, or may be applied as a radiator for an automobile.

  Various embodiments and modifications can be made to the present invention without departing from the broad spirit and scope of the present invention. Further, the above-described embodiment is for explaining the present invention, and does not limit the scope of the present invention. In other words, the scope of the present invention is shown not by the embodiments but by the claims. Various modifications within the scope of the claims and within the scope of the equivalent invention are considered to be within the scope of the present invention.

  The present invention is applicable to a heat exchanger that exchanges heat with outside air, a method for manufacturing the heat exchanger, and a fin assembly.

  1, 2, 3 heat exchanger (fin assembly), 10 fin, 11, 51, 91 flat plate (flat plate portion), 12, 52 first bent shape portion, 13, 53 second bent shape portion, 14, 54 Notches, 20 Refrigerant piping, 30, 31, 32 Metal wire

Claims (7)

A fin having a plurality of parallel plate portions and thermally connected to the refrigerant pipe;
A metal wire penetrating at least one of the plurality of flat plate portions;
With
At least one of the plurality of flat plate portions has a first bent shape portion bent in one of the stacking directions and a second bent shape portion bent in the other of the stacking directions,
The first bent shape portion and the second bent shape portion are in a state of being aligned with each other when the plurality of flat plate portions are viewed in plan, and are supported by the metal wire.
Heat exchanger. The first bent shape portion and the second bent shape portion are provided on at least one edge of the plurality of flat plate portions,
The heat exchanger according to claim 1. The fins are arranged so that outside air flows between the plurality of flat plate portions,
The first bent shape portion and the second bent shape portion are provided at the inflow position or the outflow position of the outside air,
The heat exchanger according to claim 2. The first bent shape portion and the second bent shape portion are provided in at least one central portion of the plurality of flat plate portions,
The heat exchanger according to claim 1. A plurality of the metal wires penetrates the flat plate portion,
The heat exchanger according to any one of claims 1 to 4. A notching step of providing a notch in the flat plate portion of the fin;
A first bend forming step of bending a part of the flat plate portion from the notch provided by the notch step to one side in the stacking direction to form two bent shape portions;
A second wire is formed by pushing a metal wire into one of the two bent portions formed by the first bent forming step, and bending one of the two bent portions to the other in the stacking direction. Bending formation process;
The manufacturing method of the heat exchanger containing this. A fin having a plurality of parallel plate portions;
A metal wire penetrating at least one of the plurality of flat plate portions;
With
At least one of the plurality of flat plate portions has a first bent shape portion bent in one of the stacking directions and a second bent shape portion bent in the other of the stacking directions,
The first bent shape portion and the second bent shape portion are in a state of being aligned with each other when the plurality of flat plate portions are viewed in plan, and are supported by the metal wire.
Fin assembly.

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