JP2011127867A - Heat exchanger fin, heat exchanger, and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To overcome a problem that desired contact of a fin collar and a flat heat transfer tube can not be achieved due to the generation of warpage of not only the fin collar but also a fin base face, when the flat heat transfer tube presses and opens the fin collar. <P>SOLUTION: Notched heat transfer tube inserting sections 2 are disposed at prescribed intervals in the longitudinal direction of a band plate-shaped plate fin 1 while being opened to the fin base end section of the plate fin 1 on one end side and closed on the other end side, the fin collars 7 of the shape following the outer peripheral sections of the flat heat transfer tubes 4 are disposed on the heat transfer tube inserting sections 2 along the peripheral edge sections of the heat transfer tube inserting sections 2, and the thickness of a fin collar base section 10 of the fin collar 7 is thinner than that of the fin base face 1a of the plate fin 1. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to, for example, a fin / tube heat exchanger used in an air conditioner, a refrigerator, and the like, and relates to a fin for the heat exchanger, a heat exchanger, and a method for manufacturing the same.

  As one form of a conventional heat exchanger mounted on, for example, an air conditioner, there is a fin / tube type heat exchanger formed by combining a fin formed in a strip shape and a heat transfer tube having a flat cross section. .

  14 to 18 show a conventional fin-tube heat exchanger, and FIG. 14 is a cross-sectional view showing a fin collar and a flat heat transfer tube in the conventional fin-tube heat exchanger. FIG. 15 is a perspective view showing plate fins in which fin collars are formed in a conventional fin-tube heat exchanger. FIG. 16 is a perspective view showing a fin collar portion in a conventional fin-tube heat exchanger. FIG. 17 is a cross-sectional view showing a contact state between a fin collar and a flat heat transfer tube in a conventional fin-tube heat exchanger. FIG. 18 is a cross-sectional view showing a contact state between a fin collar and a flat heat transfer tube in a conventional fin-tube heat exchanger.

  In each of these drawings, a plate-shaped fin 50 serving as a heat exchanger fin is formed with a long hole-shaped heat transfer tube insertion portion 52 through which a flat heat transfer tube 51 is inserted. The fin collar 53 is formed by being bent from the fin base surface 54 along both long sides of the peripheral edge portion of the heat transfer tube insertion portion 52. Heat transfer tube abutting portions 55 are formed at both ends of the heat transfer tube insertion portion 52 in the longitudinal direction.

  As shown in FIG. 16, it is also possible to provide bent pieces 56 on both ends in the longitudinal direction of the fin collar 53 so that the flat heat transfer tube 51 is surrounded by the fin collar 53 and the bent pieces 56.

  By the way, the relationship between the width dimension of the heat transfer tube insertion portion 52, that is, the dimension d0 between the fin collar tip portions 53a of the opposing fin collar 53 and the thickness dimension Da of the flat heat transfer tube 51 is Da> d0.

  Therefore, in the state of FIG. 14, the flat heat transfer tube 51 is inserted through the heat transfer tube insertion portion 52 and pressed between the fin collar tip portions 53 a of the fin collar 53 to be further inserted, as shown in FIG. 17. The flat heat transfer tube 51 is disposed in contact between the fin collar end portions 53 a of the fin collar 53.

  Further, the plate fin 50 for a heat exchanger for indoor units has a hydrophilic film on the surface of the plate fin 50 in order to prevent water droplets condensed on the surface of the plate fin 50 from jumping out from the blower opening of the product (dew jump). A coating is needed. When the flat heat transfer tube 51 and the plate fin 50 are joined by brazing, since the melting temperature of the brazing material is higher than the melting temperature of the hydrophilic film, the hydrophilic film is applied to the surface of the plate fin 50 after brazing. A post-coating process for coating the film is required.

Japanese Patent Laid-Open No. 2-154992 Japanese Patent Laid-Open No. 9-324995

  In the fin-tube type heat exchanger formed by combining the plate fin for a heat exchanger formed in the conventional band plate shape described above and a flat heat transfer tube having a flat cross section, along the longitudinal direction of the plate fin A heat transfer tube insertion portion 52 for inserting the flat heat transfer tube 51 at a predetermined interval is provided, and the opening width F of the inlet portion of the heat transfer tube insertion portion 52 has a flat shape heat transfer tube 51 as shown in FIG. The fin collar 53 is formed along the peripheral edge thereof, and the fin collar 53 further toward the fin collar tip 53a than the thickness dimension Da of the flat heat transfer tube 51. When the flat heat transfer tube 51 is inserted, the flat heat transfer tube 51 pushes and opens the fin collar tip 53a of the fin collar 53 so that the flat shape is formed. It has been a configuration to obtain the contact between the outer surface and the fin collar 53 of the heat pipe 51.

  However, since the opening width F at the entrance of the heat transfer tube insertion portion 52 is formed larger than the thickness dimension Da of the flat heat transfer tube 51, only the fin collar tip 53a of the fin collar 53 is formed as shown in FIG. There is a problem that the flat collar shape heat transfer tube 51 does not come into contact, and the fin collar 53 does not necessarily follow the outer surface of the flat shape heat transfer tube 51, and the desired adhesion between the fin collar 53 and the flat shape heat transfer tube 51 cannot be obtained. .

  Further, when the flat heat transfer tube 51 pushes and opens the fin collar 53, as shown in FIG. 18, not only the fin collar 53 but also the fin base surface 54 is warped. There was a problem that adhesion with the flat heat transfer tube 51 could not be obtained.

  The present invention has been made to solve the above-described problems. The flat heat transfer tube and the plate fin can be easily assembled, and the fin collar and the flat shape are suppressed while suppressing distortion of the plate fin. An object of the present invention is to provide a heat exchanger fin and a heat exchanger that are in good contact with a heat transfer tube and are excellent in heat exchange efficiency.

  The fins for the heat exchanger according to the present invention are arranged at predetermined intervals along the longitudinal direction of the plate fin formed in a strip shape, one end side is opened to the fin base end portion of the plate fin, and the other end side is closed. The heat transfer tube insertion portion is provided with a fin collar having a shape along the outer peripheral portion of the flat heat transfer tube along the peripheral edge of the heat transfer tube insertion portion. The fin collar base portion of the fin collar is formed so as to be thinner than the thickness of the fin base surface of the plate fin.

The fins for the heat exchanger according to the present invention are arranged at predetermined intervals along the longitudinal direction of the plate fin having a thickness t formed in a strip shape, and one end side is opened to the fin base end of the plate fin. The heat transfer tube insertion portion has a notch-shaped heat transfer tube insertion portion closed at the other end side, and the heat transfer tube insertion portion has a fin collar having a shape along the outer peripheral portion of the flat heat transfer tube along the peripheral edge portion of the heat transfer tube insertion portion. The fin collar is provided so as to be connected with a larger bending radius toward the fin base surface of the plate fin while setting the bending radius of the fin collar base portion of the fin collar to 4 t or less.

The fins for the heat exchanger according to the present invention are arranged at predetermined intervals along the longitudinal direction of the plate fin formed in a strip shape, one end side is opened to the fin base end portion of the plate fin, and the other end side is closed. The heat transfer tube insertion portion is provided with a fin collar having a shape along the outer peripheral portion of the flat heat transfer tube along the peripheral edge of the heat transfer tube insertion portion. The fin collar has at least one inclined portion between the fin collar root portion and the fin base surface of the plate fin.

  A heat exchanger according to the present invention is arranged at a predetermined interval along a longitudinal direction of a flat heat transfer tube formed into a flat shape and a plate fin formed into a strip shape, and one end side of the plate fin is A heat transfer tube insertion portion having a notch shape through which the flat heat transfer tube opened at the fin base end portion and closed at the other end side is inserted, and the heat transfer tube insertion portion extends along the peripheral edge of the heat transfer tube insertion portion. A fin collar having a shape along the outer periphery of the flat heat transfer tube, and the fin collar is shaped so that the thickness of the fin collar is thinner than the thickness of the fin base surface of the plate fin; It is equipped with.

The heat exchanger according to the present invention is arranged at a predetermined interval along the longitudinal direction of a flat heat transfer tube formed into a flat shape and a plate fin of a plate thickness t formed into a strip shape, and one end side thereof The plate fin has a notch-shaped heat transfer tube insertion portion that is open to the fin base end portion and is closed at the other end side, and the heat transfer tube insertion portion includes the heat transfer tube insertion portion. A fin collar having a shape along the outer peripheral portion of the flat heat transfer tube is provided along the peripheral portion, and the bending radius of the fin collar root portion of the fin collar is set to 4 t or less toward the fin base surface of the plate fin. And heat exchanger fins shaped to connect with a large bending radius.

  A heat exchanger according to the present invention is arranged at a predetermined interval along a longitudinal direction of a flat heat transfer tube formed into a flat shape and a plate fin formed into a strip shape, and one end side of the plate fin is A heat transfer tube insertion portion having a notch shape through which the flat heat transfer tube opened at the fin base end portion and closed at the other end side is inserted, and the heat transfer tube insertion portion extends along the peripheral edge of the heat transfer tube insertion portion. And a fin collar having a shape along the outer periphery of the flat heat transfer tube, and a heat having at least one inclined portion between the fin collar base portion of the fin collar and the fin base surface of the plate fin. It is provided with fins for exchangers.

  In the heat exchanger manufacturing method according to the present invention, one end side is opened at the fin base end portion of the plate fin and the other end side is closed at predetermined intervals along the longitudinal direction of the plate fin formed in a strip shape. A step of forming a notch-shaped heat transfer tube insertion portion through which the flat heat transfer tube is inserted, and a shape having a flat portion along the outer peripheral surface of the flat heat transfer tube along the peripheral portion of the heat transfer tube insertion portion. A step of forming a fin collar and a step of filling the fin collar and the flat heat transfer tube by filling an adhesive between the fin collar and the outer peripheral portion of the flat heat transfer tube. is there.

  The fin for a heat exchanger according to the present invention is provided with a fin collar having a shape along the outer peripheral portion of the flat heat transfer tube along the peripheral edge portion of the heat transfer tube insertion portion, and the thickness of the fin collar root portion of the fin collar is determined by the plate fin. By forming so as to be thinner than the thickness of the fin base surface, the adhesion between the fin collar and the flat heat transfer tube can be improved.

  The fin for a heat exchanger according to the present invention is provided with a fin collar having a shape along the outer peripheral portion of the flat heat transfer tube along the peripheral portion of the heat transfer tube insertion portion, and the bending radius of the fin collar root portion of the fin collar is 4 t or less. However, by forming the plate fin so as to be connected with a larger bending radius toward the fin base surface, the adhesion between the fin collar and the flat heat transfer tube can be improved.

The fin for a heat exchanger according to the present invention is provided with a fin collar having a shape along the outer peripheral portion of the flat heat transfer tube along the peripheral portion of the heat transfer tube insertion portion, and the fin collar base portion of the fin collar and the fin base of the plate fin. By providing at least one inclined part between the surfaces, the adhesion between the fin collar and the flat heat transfer tube can be improved.

  The heat exchanger according to the present invention is provided with a flat heat transfer tube and a fin collar having a shape along the outer peripheral portion of the flat heat transfer tube along the peripheral edge portion of the heat transfer tube insertion portion. By providing heat exchanger fins that are shaped to be thinner than the fin base surface of the fin, the adhesion between the fin collar and the flat heat transfer tube can be improved, and heat exchange performance is improved. An excellent heat exchanger can be obtained.

  The heat exchanger according to the present invention is provided with a flat heat transfer tube and a fin collar having a shape along the outer peripheral portion of the flat heat transfer tube along the peripheral edge of the heat transfer tube insertion portion. The fin collar and the flat heat transfer tube are in close contact with each other by providing a heat exchanger fin that is shaped to be connected to the fin base surface of the plate fin with a larger bending radius while setting the bending radius of the plate fin to 4 t or less. The heat exchanger excellent in heat exchange performance can be obtained.

  The heat exchanger according to the present invention is provided with a flat heat transfer tube and a fin collar having a shape along the outer peripheral portion of the flat heat transfer tube along the peripheral edge of the heat transfer tube insertion portion. And the fin base surface of the plate fin are provided with heat exchanger fins having at least one inclined portion, the adhesion between the fin collar and the flat heat transfer tube can be improved, A heat exchanger excellent in heat exchange performance can be obtained.

  In the heat exchanger manufacturing method according to the present invention, a fin collar having a shape along the outer peripheral portion of the flat heat transfer tube is formed along the peripheral portion of the heat transfer tube insertion portion, and the flat portion of the fin collar and the flat heat transfer tube are formed. Adhesive is filled between the outer peripheral surface and the fin collar and the flat heat transfer tube are joined, thereby improving the adhesion between the fin collar and the flat heat transfer tube and heat exchange performance. An excellent heat exchanger can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS It is a general-view perspective view which shows the fin tube type heat exchanger concerning Embodiment 1 of this invention. It is a general | schematic perspective view which shows the fin for heat exchangers used for the fin tube type heat exchanger concerning Embodiment 1 of this invention. It is a general | schematic perspective view which is a shaping | molding process of the fin for heat exchangers used for the fin tube type heat exchanger concerning Embodiment 1 of this invention, Comprising: Molding of the heat exchanger tube penetration part. It is sectional drawing which shows the heat exchanger tube insertion part of the fin for heat exchangers used for the fin tube type heat exchanger concerning Embodiment 1 of this invention. It is sectional drawing which shows the flat shape heat exchanger tube in the fin tube type heat exchanger concerning Embodiment 1 of this invention. It is an assembled state in the fin tube type heat exchanger concerning Embodiment 1 of this invention, Comprising: It is sectional drawing which shows the state by which the flat shape heat exchanger tube was penetrated by the heat exchanger tube penetration part.

It is a general-view perspective view which shows the fin for heat exchangers used for the fin tube type heat exchanger concerning Embodiment 2 of this invention. It is sectional drawing which shows the heat exchanger tube insertion part of the fin for heat exchangers used for the fin tube type heat exchanger concerning Embodiment 2 of this invention. It is sectional drawing which shows the assembly state in the fin tube type heat exchanger concerning Embodiment 2 of this invention, Comprising: The state in which the flat shape heat exchanger tube was penetrated by the heat exchanger tube penetration part.

It is a general | schematic perspective view which shows the fin for heat exchangers used for the fin tube type heat exchanger concerning Embodiment 3 of this invention. It is sectional drawing which shows the heat exchanger tube insertion part of the fin for heat exchangers used for the fin tube type heat exchanger concerning Embodiment 3 of this invention. It is sectional drawing which is an assembly state in the fin tube type heat exchanger concerning Embodiment 3 of this invention, Comprising: A flat-shaped heat exchanger tube is inserted in the heat exchanger tube insertion part. It is a general-view perspective view which shows the fin tube type heat exchanger concerning Embodiment 4 of this invention.

It is sectional drawing which shows the fin collar and flat shape heat exchanger tube in the conventional fin tube type heat exchanger. It is a perspective view which shows the plate fin in which the fin collar in the conventional fin tube type heat exchanger was shape | molded. It is a perspective view which shows the fin collar part in the conventional fin tube type heat exchanger. It is sectional drawing which shows the contact state of the fin collar and the flat shape heat exchanger tube in the conventional fin tube type heat exchanger. It is sectional drawing which shows the contact state of the fin collar and the flat shape heat exchanger tube in the conventional fin tube type heat exchanger.

Embodiment 1.
Embodiment 1 of the present invention will be described below with reference to FIGS. FIG. 1 is a schematic perspective view showing a fin-tube heat exchanger according to Embodiment 1 of the present invention. FIG. 2 is a schematic perspective view showing a heat exchanger fin used in the fin-tube heat exchanger according to Embodiment 1 of the present invention. FIG. 3 is a schematic perspective view showing a heat exchanger tube insertion part forming process of a heat exchanger fin used in the fin-tube heat exchanger according to Embodiment 1 of the present invention. 4 is a cross-sectional view showing a heat transfer tube insertion portion of a heat exchanger fin used in the fin-tube heat exchanger according to Embodiment 1 of the present invention. FIG. 5 is a sectional view showing a flat heat transfer tube in the fin-tube heat exchanger according to Embodiment 1 of the present invention. FIG. 6 is a cross-sectional view showing an assembled state in the fin-tube heat exchanger according to Embodiment 1 of the present invention, in which a flat heat transfer tube is inserted into the heat transfer tube insertion portion.

  As shown in FIG. 1, a fin-tube heat exchanger 1 according to Embodiment 1 of the present invention has a plurality of plate fins 1 formed in a strip shape and stacked in a longitudinal direction at a predetermined interval FP. A strip-shaped heat exchanger fin 3 that is disposed and provided with heat transfer tube insertion portions 2 at a predetermined interval DP in the longitudinal direction, and a flat shape that is inserted into the heat transfer tube insertion portion 2 at a predetermined interval DP. And a distribution pipe 5 connected to the end of the flat shape heat transfer tube 4 and forming a refrigerant circulation circuit together with the flat shape heat transfer tube 4.

In the above configuration, the plate thickness t of the plate fin 1, the stacking interval FP of the heat exchanger fins 3, and the interval DP of the flat heat transfer tubes 4 are determined by the characteristics of the heat exchanger. t is 0.09 mm to 0.2 mm, the stacking interval FP of the heat exchanger fins 3 is 1.0 mm to 2.0 mm, and the interval DP of the flat heat transfer tubes 4 is 5.0 mm to 20.0 mm. A slit 6 is desirably cut and raised between the adjacent heat transfer tube insertion portions 2 of the plate fin 1 for the purpose of promoting heat exchange between the plate fin 1 and air, and the height h of the slit 6 is It is desirable that it is approximately half the stacking interval FP of the heat exchanger fins 3.

  The surface of the plate fin 1 is preferably provided with a resin coating for the purpose of anticorrosion, antifouling, hydrophilicity or water repellency. The resin coating also has the effect of reducing the frictional resistance between the plate fin 1 and the flat heat transfer tube 4 when the flat heat transfer tube 4 is inserted, and improving the assemblability.

  Further, the plate fin 1 and the flat heat transfer tube 4 are joined by an adhesive. By joining with an adhesive, a furnace that is indispensable for brazing the fin collar 53 of the plate fin 50 and the flat heat transfer tube 51 as in the conventional case is not necessary, and the environmental load is low and low. A heat exchanger can be manufactured at low cost.

  In addition, since the plate fin 1 is not exposed to the high temperature during brazing, a pre-coated fin material pre-coated with resin can be used, and the post-coating step for coating after assembly is not required as in the prior art. There is an effect that the process can be shortened.

  On the other hand, considering the performance of the heat exchanger, when the plate fin 1 and the flat heat transfer tube 4 are joined with an adhesive, the heat transfer between the plate fin 1 and the flat heat transfer tube 4 is not a metal joint. Both contact areas and the thickness of the adhesive applied to the contact surface are greatly affected. Therefore, it is necessary to obtain adhesion between the plate fin 1 and the flat heat transfer tube 4 with a sufficient contact area and an adhesive having a predetermined thickness.

  As in the conventional case described above, when the fin collar 53 of the plate fin 50 and the flat heat transfer tube 51 are joined by brazing, a metal joint is obtained by brazing. The heat transfer between the heat pipes 51 is not affected by the contact area between them and the clearance of the heat transfer pipe insertion part 52, and it is sufficient that at least a clearance that can be brazed is secured. For this reason, the conventional heat exchanger fin structure, heat exchanger, and heat exchanger manufacturing method do not give sufficient consideration to the adhesion between the plate fins and the heat transfer tubes.

  FIG. 2 is a schematic perspective view showing a heat exchanger fin used in the fin-tube heat exchanger according to Embodiment 1 of the present invention. The material of the plate fin 1 of the heat exchanger fin 3 according to the first embodiment of the present invention is formed into a strip shape with a thin plate of, for example, 0.09 to 0.2 mm mainly made of aluminum or an aluminum alloy. It is desirable that the surface is provided with a surface treatment film for the purpose of anticorrosion, antifouling, hydrophilicity or water repellency.

The fin base surface 1a of the plate fin 1 is provided with a heat transfer tube insertion portion 2 for inserting the flat heat transfer tube 4 at a predetermined interval DP in the longitudinal direction of the plate fin 1, and the heat transfer tube insertion portion 2 is inserted. Has a shape that substantially follows the outer peripheral surface of the flat heat transfer tube 4, and is formed in a notch shape in which one end side is open to the fin base end portion of the plate fin 1 and the other end side is closed.
A fin collar 7 having a shape along the outer peripheral surface of the flat heat transfer tube 4 is formed along the peripheral edge of the heat transfer tube insertion portion 2. The fin collar 7 has a U-shaped cross section.

Furthermore, a slit 6 is cut and raised from the fin base surface 1 a between adjacent heat transfer tube insertion portions 2, and the height of the slit 6 cut from the fin base surface 1 a is equal to the stacking interval FP of the plate fins 1. It is desirable to be approximately half.
It is desirable that the height of the fin collar 7 formed in the heat transfer tube insertion portion 2 of the plate fin 1 is substantially equal to the FP within a range not exceeding the interval FP of the plate fins 1 that are stacked.
By making the height of the fin collar 7 sufficiently high in a range not exceeding FP, the contact area between the plate fin 1 and the flat heat transfer tube 4 can be widened, and the heat transfer performance can be improved.

As shown in FIGS. 3 and 4, the fin collar 7 forms a lower hole 8 on the fin base surface 1 a of the plate fin 1, and the peripheral portion 9 of the lower hole 8 is formed on the flat heat transfer tube 4. It is shaped by bending or burring from the fin base surface 1a of the plate fin 1 with a predetermined bending radius R and bending angle θ along the outer peripheral portion, and the thickness of the fin collar root portion 10 is the fin base of the plate fin 1 It shape | molds so that it may become thinner than the thickness t of the surface 1a.
Further, the heat transfer tube abutting portion 11 is also formed with the formation of the fin collar 7. A fin collar flat surface portion 12 is formed between the fin collar root portion 10 and the fin collar tip portion 7 a of the fin collar 7.

As shown in FIG. 5, when the short axis width of the flat heat transfer tube 4 is Da, and the fin collar 7 position of the heat transfer tube insertion portion 2 is Dc as shown in FIG. 4, Dc = Da ± 2t. It is desirable to be. The bending radius R is, for example, 0.3 mm to 0.1 mm, and the bending angle θ is, for example, 60 ° to 80 °. The fin collar plane portion 12 of the fin collar 7 is widened by reducing the bending radius R of the fin collar root portion 10 of the fin collar 7 while the heat transfer tube insertion portion 2 is shaped along the outer periphery of the flat heat transfer tube 4. Thus, there is an effect that the adhesion area between the fin collar 7 and the flat heat transfer tube 4 is remarkably increased and the heat transfer rate is improved. However, the fin collar 7 is molded with a bending radius R so that the fin collar root portion 10 of the fin collar 7 is not broken. If the bending radius R is 4 t or less, the intended purpose can be achieved.
The better the heat exchange performance is, the better the adhesion between the fin collar 7 and the flat heat transfer tube 4 is. If the bending radius R of the fin collar base portion 10 is too small, the fin collar 7 may be cracked, making it difficult to mold the fin collar 7. On the other hand, when the bending radius R is increased, the length of the fin collar plane portion 12 that is a straight portion of the fin collar 7 is shortened, so that the heat exchange is performed by reducing the contact area between the fin collar 7 and the flat heat transfer tube 4. Performance will be reduced. Therefore, the bending radius R at the fin collar root portion 10 of the fin collar 7 is preferably t to 3t.

  When the fin collar 7 has a predetermined bending angle with respect to the fin base surface 1a of the plate fin 1, when the flat heat transfer tube 4 is inserted into the heat transfer tube insertion portion 2 in the direction of arrow A as shown in FIG. In addition, the fin collar 7 is spread over the flat heat transfer tube 4, and the fin collar flat portion 12, which is the inner surface of the fin collar 7, is in close contact with the outer surface of the flat heat transfer tube 4 with a significantly increased contact area.

  By making the fin collar base portion 10 thinner than the fin base surface 1a of the plate fin 1, the bending moment when the flat heat transfer tube 4 spreads the fin collar 7 is concentrated on the fin collar root portion 10, and the fin collar 7 The distortion of the fin collar plane portion 12 and the fin base surface 1a of the plate fin 1 can be suppressed, the adhesion between the fin collar 7 and the flat heat transfer tube 4 is remarkably improved, and the fin collar 7 and the flat heat transfer tube 4 are improved. This improves the heat transfer performance and reduces the airflow resistance between the laminated plate fins 1.

  In addition, if the bending angle θ of the fin collar 7 is too large, when the flat heat transfer tube 4 is inserted into the heat transfer tube insertion portion 2, the fin collar 7 is warped, resulting in poor adhesion, or the bending angle θ is too small. In addition to the excessive insertion force of the flat-shaped heat transfer tube 4, the assemblability is deteriorated and the fins 7 are not distorted and the adhesion between the fin collar 7 and the flat-shaped heat transfer tube 4 is not deteriorated. Molding is performed at the bending angle θ of the collar 7.

Regarding the shape of the fin collar 7, the side surface portion of the flat heat transfer tube 4 is formed by bending the fin collar 7 from the fin base surface 1 a of the plate fin 1, and the heat transfer tube abutting portion 11 of the heat transfer tube insertion portion 2 is also flat. The fin collar 7 is desirably burring-molded from the fin base surface 1 a of the plate fin 1 in a shape along the curved surface of the heat transfer tube 4. As shown in FIG. 15, the fin collar 53 erected on the heat transfer tube insertion portion 52 is bent from the fin base surface 54 mainly on the long side surface of the flat heat transfer tube 51. Therefore, sufficient consideration was not given to uneven heat transfer between the plate fins 50 and the flat heat transfer tubes 51. However, in the first embodiment, as described above, the fin collar 7 surrounds the flat heat transfer tube 4 with a U-shaped cross section, so that the heat transfer unevenness between the flat heat transfer tube 4 and the plate fin 1 is uneven. The heat exchange efficiency can be improved.

  Further, as shown in FIG. 16 of the related art described above, even when the bent piece 56 is formed on the short side surface of the flat heat transfer tube 51 of the heat transfer tube insertion portion 52, the bent piece 56 is flat-shaped heat transfer tube 51. However, the heat transfer between the plate fin 50 and the flat heat transfer tube 51 was not sufficient. However, in the first embodiment, the fin collar flat surface portion 12 which is the inner surface of the fin collar 7 is in close contact with the outer surface of the flat heat transfer tube 4 in a state where the contact area is remarkably increased. The heat transfer efficiency with the shape heat transfer tube 4 can be remarkably improved.

  Furthermore, the material of the flat heat transfer tube 4 used in the fin-tube heat exchanger according to Embodiment 1 of the present invention is mainly made of aluminum or an aluminum alloy. And the cross section perpendicular | vertical to a longitudinal direction is comprised by the substantially oval flat shape as shown in FIG. The flat heat transfer tube 4 is preferably a multi-hole tube having a partition wall 13 inside. The number of the refrigerant flow paths 14 and the thickness of the partition wall 13 are determined by the pressure of the refrigerant flowing inside and the characteristics of the heat exchanger. By using the multi-hole tube, the contact area between the inner surface of the flat heat transfer tube 4 and the refrigerant increases, so that the heat exchange efficiency is improved.

  In addition, although the fin tube type heat exchanger shown in FIG. 1 describes the case where two flat shape heat transfer tubes 4 that are hairpin bent into a U shape are provided, the number of the flat shape heat transfer tubes 4 and The presence or absence of hairpin bending is determined by the characteristics of the heat exchanger.

  As described above, according to the first embodiment, the fin collar plane portion 12 which is the inner surface of the fin collar 7 can be brought into close contact with the outer surface of the flat heat transfer tube 4 in a state in which the contact area is significantly increased. Since the fin collar plane portion 12 which is the inner surface of the fin collar 7 can be firmly fixed to the outer surface of the flat heat transfer tube 4 via an adhesive, the plate fin 1 and the flat heat transfer tube 4 It is possible to obtain a finned tube heat exchanger capable of remarkably improving the heat transfer efficiency.

Embodiment 2.
A second embodiment of the present invention will be described with reference to FIGS. FIG. 7 is a schematic perspective view showing a heat exchanger fin used in a fin-tube heat exchanger according to Embodiment 2 of the present invention. FIG. 8 is a cross-sectional view showing a heat transfer tube insertion portion of a heat exchanger fin used in a fin-tube heat exchanger according to Embodiment 2 of the present invention. FIG. 9 is a sectional view showing an assembled state in the fin-tube heat exchanger according to the second embodiment of the present invention, in which a flat heat transfer tube is inserted into the heat transfer tube insertion portion.

  In the heat exchanger fin 3 according to the first embodiment described above, the case where the thickness of the fin collar root portion 10 of the fin collar 7 is formed to be thinner than the thickness of the fin base surface 1a of the plate fin 1 will be described. However, in Embodiment 2 of the present invention, the fin collar 7 is formed by thinning the fin collar root portion 10 of the fin collar 7.

  Therefore, in the fin-and-tube heat exchanger according to Embodiment 2 of the present invention, the fin collar 7 formed on the heat transfer tube insertion portion 2 of the heat exchanger fin 3 is disposed below the fin base surface 1a of the plate fin 1. The hole 8 is formed, and the peripheral portion 9 of the lower hole 8 is bent along the outer peripheral portion of the flat heat transfer tube 4 with a predetermined bending radius R and bending angle θ from the fin base surface 1a of the plate fin 1 or burring. In addition, it is shaped so as to be gradually connected to the fin base surface 1a of the plate fin 1 with a large bending radius while setting the bending radius R of the fin collar root portion 15 to be. By molding in this way, the fin collar 7 can be molded without reducing the thickness of the fin collar root portion 15, so that the fin collar root portion 15 is not broken at all and has high reliability. Become.

  By the way, when the short axis width of the flat heat transfer tube 4 is Da as shown in FIG. 9 and the fin collar 7 position of the heat transfer tube insertion portion 2 is Dc as shown in FIG. 8, Dc = Da ± 2t. It is desirable to be. The bending radius R is, for example, 0.3 mm to 0.1 mm, and the bending angle θ is, for example, 60 ° to 80 °. The fin collar plane portion 12 of the fin collar 7 is widened by reducing the bending radius R of the fin collar root portion 15 of the fin collar 7 while the heat transfer tube insertion portion 2 is shaped along the outer periphery of the flat heat transfer tube 4. Thus, the contact area between the fin collar 7 and the flat heat transfer tube 4 is remarkably increased to improve the heat transfer coefficient, and the thermal resistance from the fin collar 7 to the fin base surface 1a of the plate fin 1 is reduced. Therefore, there is an effect that the heat exchange performance is improved. However, the bending radius R is made too small so that the fin collar 7 is molded with a bending radius R so that the fin collar root portion 15 of the fin collar 7 is not broken. If the bending radius R is 4 t or less, the intended purpose can be achieved.

  Since the fin collar 7 has a predetermined bending angle with respect to the fin base surface 1 a of the plate fin 1, when the flat heat transfer tube 4 is inserted into the heat transfer tube insertion portion 2, the fin collar 7 is flat-shaped heat transfer tube 4. As shown in FIG. 9, the fin collar plane portion 12 which is the inner surface of the fin collar 7 is in close contact with the outer surface of the flat heat transfer tube 4 in a state where the contact area is remarkably increased.

  By forming the fin collar 7 so as to be gradually connected to the fin base surface 1a of the plate fin 1 with a large bending radius while setting the bending radius R of the fin collar root portion 15 of the fin collar 7, the fin collar of the fin collar 7 is formed. Since the flat moment 12 when the flat heat transfer tube 4 pushes and spreads the fin collar 7 is dispersed on the fin base surface 1a of the plate fin 1, the area of the flat portion 12 is kept wide. 12 and the fin base surface 1a of the plate fin 1 can be suppressed, the adhesion between the fin collar 7 and the flat heat transfer tube 4 is remarkably improved, and the heat transfer performance between the fin collar 7 and the flat heat transfer tube 4 is improved. The air flow resistance between the stacked plate fins 1 is reduced.

  In addition, if the bending angle θ of the fin collar 7 is too large, when the flat heat transfer tube 4 is inserted into the heat transfer tube insertion portion 2, the fin collar 7 is warped, resulting in poor adhesion, or the bending angle θ is too small. In addition to the excessive insertion force of the flat-shaped heat transfer tube 4, the assemblability is deteriorated and the fins 7 are not distorted and the adhesion between the fin collar 7 and the flat-shaped heat transfer tube 4 is not deteriorated. Molding is performed at the bending angle θ of the collar 7.

  As described above, according to the second embodiment, the fin collar plane portion 12 that is the inner surface of the fin collar 7 can be brought into close contact with the outer surface of the flat heat transfer tube 4 in a state where the contact area is significantly increased. Since the fin collar plane portion 12 which is the inner surface of the fin collar 7 can be firmly fixed to the outer surface of the flat heat transfer tube 4 via an adhesive, the plate fin 1 and the flat heat transfer tube 4 It is possible to obtain a finned tube heat exchanger capable of remarkably improving the heat transfer efficiency.

Embodiment 3 FIG.
A third embodiment of the present invention will be described with reference to FIGS. FIG. 10 is a schematic perspective view showing a heat exchanger fin used in a fin-tube heat exchanger according to Embodiment 3 of the present invention. FIG. 11: is sectional drawing which shows the heat exchanger tube penetration part of the fin for heat exchangers used for the fin tube type heat exchanger concerning Embodiment 3 of this invention. FIG. 12 is a sectional view showing an assembled state in the fin-tube heat exchanger according to the third embodiment of the present invention, in which a flat heat transfer tube is inserted into the heat transfer tube insertion portion.

  In the fin-and-tube heat exchanger according to Embodiment 3 of the present invention, the fin collar 7 formed on the heat transfer tube insertion portion 2 of the heat exchanger fin 3 is formed on the fin base surface 1 a of the plate fin 1 with the pilot hole 8. , And the peripheral edge 9 of the lower hole 8 is bent or burred from the fin base surface 1a of the plate fin 1 with a predetermined bending radius R and bending angle θ in a shape along the outer peripheral portion of the flat heat transfer tube 4. In addition, the fin collar base portion 16 and the fin base surface 1a of the plate fin 1 are formed so as to be connected by the inclined portion 17 in at least one stage while the bending radius R1 of the fin collar root portion 16 is set. By molding in this way, the fin collar 7 can be molded without reducing the thickness of the fin collar root portion 16, so that the fin collar root portion 16 is not broken at all and has high reliability. Become.

  The bending radius R1 is, for example, 0.3 mm to 0.1 mm, and the bending angle θ is, for example, 60 ° to 80 °. The bending radius R2 of the bent portion 18 connected to the inclined portion 17 from the fin base surface 1a of the plate fin 1 is R2 ≧ R1. The area of the flat portion 12 of the fin collar 7 is increased by reducing the bending radius of the fin collar root portion 16 of the fin collar 7 while making the heat transfer tube insertion portion 2 along the outer periphery of the flat heat transfer tube 4. As a result, the adhesion area between the fin collar 7 and the flat heat transfer tube 4 is remarkably increased to improve the heat transfer coefficient, and the thermal resistance from the fin collar 7 to the fin base surface 1a of the plate fin 1 is reduced. The heat exchange performance is improved. However, if the bending radius is too small, the fin collar 7 is formed with a bending radius that prevents the fin collar root portion 16 of the fin collar 7 from being broken. If the bending radius is 4 t or less, the intended purpose can be achieved.

  Since the fin collar 7 has a predetermined bending angle with respect to the fin base surface 1 a of the plate fin 1, when the flat heat transfer tube 4 is inserted into the heat transfer tube insertion portion 2, the fin collar 7 is flat-shaped heat transfer tube 4. As shown in FIG. 12, the fin collar flat surface portion 12 which is the inner surface of the fin collar 7 is in close contact with the outer surface of the flat heat transfer tube 4 in a state where the contact area is remarkably increased.

  The fin collar 7 has a bend radius R1 of the fin collar root portion 15 of the fin collar 7 so that the fin collar root portion 16 and the fin base surface 1a of the plate fin 1 are connected by an inclined portion 17 at least in one stage. Is formed so that the area of the fin collar plane portion 12 of the fin collar 7 is kept large, and the bending moment when the flat heat transfer tube 4 spreads the fin collar 7 causes the inclination of the fin collar root portion 15 and its peripheral edge. Since it is received by the portion 17, the distortion of the fin collar plane portion 12 of the fin collar 7 and the fin base surface 1 a of the plate fin 1 can be suppressed, and the adhesion between the fin collar 7 and the flat heat transfer tube 4 is remarkably good. And improving the heat transfer performance between the fin collar 7 and the flat heat transfer tube 4 and between the plate fins 1 stacked. There is an effect of reducing the wind resistance.

Further, if the bending angle θ of the fin collar 7 is too large, when the flat heat transfer tube 4 is inserted into the heat transfer tube insertion portion 2, the fin collar 7 is warped, resulting in poor adhesion, or the bending angle θ
If the thickness is too small, the insertion force of the flat heat transfer tube 4 becomes excessive and the assemblability deteriorates, and the plate fin 1 is distorted so that the adhesion between the fin collar 7 and the flat heat transfer tube 4 does not deteriorate. Further, the fin collar 7 is molded at a bending angle θ.

  As described above, according to the third embodiment, the fin collar plane portion 12 that is the inner surface of the fin collar 7 can be brought into close contact with the outer surface of the flat heat transfer tube 4 in a state in which the contact area is significantly increased, Since the fin collar plane portion 12 which is the inner surface of the fin collar 7 can be firmly fixed to the outer surface of the flat heat transfer tube 4 via an adhesive, the plate fin 1 and the flat heat transfer tube 4 It is possible to obtain a finned tube heat exchanger capable of remarkably improving the heat transfer efficiency.

Embodiment 4 FIG.
Embodiment 4 of the present invention will be described with reference to FIG. FIG. 13 is a schematic perspective view showing a fin-tube heat exchanger according to Embodiment 4 of the present invention.

  FIG. 13 shows a fin-tube heat exchanger 200 according to Embodiment 4 of the present invention. Even if the header 19 is used as an alternative to the fin-and-tube heat exchanger 200 and the distribution pipe 5 described in the above-described first embodiment, the same effects as those of the above-described embodiments can be obtained.

  For example, the header 19 is provided with pipe connection portions 20a, 20b, and 20c, and the inside of the header 20 is, for example, between the pipe connection portion 20a and the pipe connection portion 20b, and between the pipe connection portion 20b and the pipe connection portion section 20c. Is partitioned by a partition member (not shown), and the refrigerant is allowed to flow through the flat heat transfer tube 4 from the pipe connection portion 20a and the pipe connection portion 20c and then discharged from the pipe connection portion 20b, or the refrigerant is supplied to the pipe connection portion. After the flat heat transfer tube 4 is circulated from 20b, it may be discharged from the pipe connection part 20a and the pipe connection part 20c. In this way, the refrigerant can be stirred inside the header 19, Dispersion unevenness is suppressed, and a heat exchanger excellent in heat exchange performance can be obtained.

  The present invention relates to, for example, a fin / tube heat exchanger used in an air conditioner, a refrigerator, and the like, and is suitable for realizing a heat exchanger fin and a heat exchanger excellent in heat exchange performance.

DESCRIPTION OF SYMBOLS 1 Plate fin 1a Fin base surface 2 Heat transfer pipe insertion part 3 Heat exchanger fin collar 4 Flat shape heat transfer pipe 7 Fin collar 10 Fin collar root part 12 Plane part 15 Fin collar root part 16 Fin collar root part 17 Inclination part

Claims (11)

  A notch-shaped heat transfer tube insertion portion that is disposed at a predetermined interval along the longitudinal direction of the plate fin formed in a strip shape, and has one end opened to the fin base end of the plate fin and the other end closed. The heat transfer tube insertion portion is provided with a fin collar having a shape along the outer peripheral portion of the flat heat transfer tube along the peripheral edge of the heat transfer tube insertion portion, and the thickness of the fin collar root portion of the fin collar Is formed so as to be thinner than the thickness of the fin base surface of the plate fin.   A notch-shaped transmission that is disposed at predetermined intervals along the longitudinal direction of the plate fin having a plate thickness t formed in a strip shape, with one end opened to the fin base end of the plate fin and the other end closed. A fin collar having a shape along the outer peripheral portion of the flat heat transfer tube is provided along the peripheral edge of the heat transfer tube insertion portion, and a fin collar root of the fin collar. A fin for a heat exchanger, characterized in that it is shaped so as to be connected with a larger bending radius toward the fin base surface of the plate fin while setting the bending radius of the portion to 4 t or less.   The fin for a heat exchanger according to claim 2, wherein a bending radius of a fin collar base portion of the fin collar is t to 3t.   A notch-shaped heat transfer tube insertion portion that is disposed at a predetermined interval along the longitudinal direction of the plate fin formed in a strip shape, and has one end opened to the fin base end of the plate fin and the other end closed. The heat transfer tube insertion portion is provided with a fin collar having a shape along the outer peripheral portion of the flat heat transfer tube along the peripheral edge of the heat transfer tube insertion portion, and the fin collar root portion of the fin collar and the plate A fin for a heat exchanger having at least one inclined portion between the fin base surface of the fin.   The fin for a heat exchanger according to any one of claims 1 to 4, wherein the fin collar has a U-shaped cross section. A flat heat transfer tube formed into a flat shape and a plate fin formed into a strip plate are arranged at predetermined intervals along the longitudinal direction, and one end is open to the fin base end of the plate fin and the other end A heat transfer tube insertion portion having a notch shape through which the flat shape heat transfer tube whose side is closed is inserted, and the heat transfer tube insertion portion has an outer peripheral portion of the flat shape heat transfer tube along a peripheral edge of the heat transfer tube insertion portion And a fin for a heat exchanger, wherein the fin collar is shaped so that the thickness of the fin collar is thinner than the thickness of the fin base surface of the plate fin. Exchanger.   A flat heat transfer tube formed into a flat shape and a plate fin with a plate thickness t formed into a strip shape are arranged at predetermined intervals along the longitudinal direction, and one end side is at the fin base end of the plate fin. It has a notch-shaped heat transfer tube insertion portion through which the flat heat transfer tube that is open and closed at the other end is inserted, and the heat transfer tube insertion portion has the flat shape transfer along the peripheral edge of the heat transfer tube insertion portion. A fin collar having a shape along the outer peripheral portion of the heat tube is provided, and the fin collar base portion of the fin collar is formed to be connected to the fin base surface of the plate fin with a larger bend radius while setting the bend radius to 4 t or less. And a heat exchanger fin.   The heat exchanger according to claim 7, wherein a bending radius of the fin collar base portion of the fin collar is t to 3t.   A flat heat transfer tube formed into a flat shape and a plate fin formed into a strip plate are arranged at predetermined intervals along the longitudinal direction, and one end is open to the fin base end of the plate fin and the other end A heat transfer tube insertion portion having a notch shape through which the flat shape heat transfer tube whose side is closed is inserted, and the heat transfer tube insertion portion has an outer peripheral portion of the flat shape heat transfer tube along a peripheral edge of the heat transfer tube insertion portion And a fin for a heat exchanger having at least one inclined portion between a fin collar root portion of the fin collar and a fin base surface of the plate fin. Features heat exchanger.   The heat exchanger according to any one of claims 6 to 9, wherein the fin collar has a U-shaped cross section.   A notch shape through which the flat heat transfer tube having one end opened to the fin base end of the plate fin and closed at the other end is inserted at predetermined intervals along the longitudinal direction of the plate fin formed in a strip shape. Forming the heat transfer tube insertion portion, forming the fin collar having a shape having a flat portion along the outer peripheral surface of the flat heat transfer tube along the peripheral edge portion of the heat transfer tube insertion portion, and the fin collar A method of manufacturing a heat exchanger, comprising: a step of filling an adhesive between a flat portion and an outer peripheral surface of the flat heat transfer tube to join the fin collar and the flat heat transfer tube .

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