JPH11351776A - Heat transfer device having discontinuous fins and method of manufacturing the same - Google Patents

Abstract

(57) [Summary] [Problem] To increase the surface area of a fin in contact with air while increasing the strength of the fin to prevent an increase in ventilation resistance due to deformation of the fin, secure a predetermined air volume, and provide a good heat exchange performance. Get. A heat transfer device comprising a heat transfer tube (3) and a fin portion (fin-shaped winding fin (F)) having a flat bottom flange (2) and forming a fin (1) by winding around the heat transfer tube (3). 1, the top 1a is continuous,
A heat transfer device having discontinuous fins in which a bottom fin is bent left and right to form fin-like fins at two right and left portions of a bottom flange 2, and a top 1 a of the fin-like fin has a curved surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat transfer device having a discontinuous fin and a method of manufacturing the same, and more particularly to a heat transfer device in which a discontinuous fin having a bottom flange as a fin is wound around a heat transfer tube. It is used for condensers such as refrigerators, air conditioners, refrigerators, and showcases.

[0002]

2. Description of the Related Art Conventionally, a fin-shaped member wound around a tube to form a fin of a heat transfer tube includes, for example,
Japanese Patent Publication No. 38-8442 is known. FIG.
Is a perspective view showing a conventional strip-shaped winding fin described in the above publication, and FIG. 12 is a partially cutaway sectional view of a heat transfer device in which the fin of FIG. 11 is wound around a heat transfer tube. 11 and 12, 1 is a strip-shaped fin, 2 is a bottom flange, and 3 is a heat transfer tube. Conventionally, a strip-shaped fin member shown in FIG. 11 is wound around the heat transfer tube 3 as shown in FIG. 12 to form a heat transfer device.

[0003] As shown in FIG.
This is a so-called discontinuous fin in which the fin 1 on the outer peripheral side is divided into a plurality of parts when viewed in the cross section of the heat transfer tube. Such a discontinuous fin is developed in response to the fact that a continuous fin in which the outer peripheral side of the fin member is not divided requires processing such as providing a cut at the base side to be wound around the heat transfer tube.

[0004]

However, the heat transfer device having the discontinuous fins conventionally proposed has the following problems. That is, the fin-shaped fin 1 having the configuration shown in FIGS. 11 and 12 is in the shape of a strip, and the fin-shaped fin is self-supporting so-called cantilevered with the bottom flange 2 as a fulcrum. When an external force acts on the fins 1 during transportation or the like, the fin-like fins are easily deformed. As a result, the deformed fins 1 block the air flow path, increase ventilation resistance, reduce the air volume, and reduce the heat exchange performance. There was a problem of falling.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art. It is an object of the present invention to increase the fin surface area in contact with air while increasing the strength of the fin to improve the deformation of the fin. It is an object of the present invention to provide a heat transfer device having a discontinuous fin and a method of manufacturing the same, which can prevent an increase in ventilation resistance due to air flow and efficiently secure a predetermined air volume.

[0006]

According to a first aspect of the present invention, a heat transfer device having a discontinuous fin is provided with a heat transfer tube or a heat transfer base surface similar to the heat transfer tube. In a heat transfer device comprising a flat bottom flange and a fin portion forming a fin-like fin by being wound around the heat transfer tube or the heat transfer base surface, the wound fin portion has a top portion of the fin-like fin continuous. The fins are supported at two places on the left and right sides of the bottom flange formed by bending the bottom part right and left, and the tops of the fins are curved.

In order to achieve the above object, a second configuration of the heat transfer device having discontinuous fins according to the present invention is as follows.
In a heat transfer device comprising a heat transfer tube or a heat transfer base surface similar to the heat transfer tube, and a fin portion having a flat bottom flange and forming a fin-like fin by being wound around the heat transfer tube or the heat transfer base surface, The fin portion has a shape in which the top of the fin-like fin is continuous, and the fin-like fin is formed by supporting the fin-like fin at two right and left portions of a bottom flange formed by bending the bottom to the left and right. It is.

More specifically, in the first and second configurations, the distance between the right and left flanges of the bottom flange of the fin-shaped fin is s, the width of the flange is w, and s <2.5.
w.

In the first and second configurations, each of the right and left flanges of the bottom flange of the fin is folded left and right with respect to the fin, and a space region is formed between the left and right fins of the fin. The dimension t between the left and right fins is within the range of approximately the height of the fin-like fins.
= Constant.

Further, in each of the above constructions, the fins are formed by shaping the base of the fin by the fin winding angle θ so that the fin-like fin of the fin portion and the axis of the heat transfer tube are orthogonal to each other. Further, the interval p between the outer end of the bottom flange of the fin portion and the outer end of the adjacent bottom flange is set to a desired value in the axial direction of the heat transfer tube.

Further, in order to achieve the above object, a method of manufacturing a heat transfer device having discontinuous fins according to the present invention comprises a heat transfer tube or a heat transfer base surface similar to the heat transfer tube, and a flat bottom flange. In the method for manufacturing a heat transfer device having a discontinuous fin comprising a fin portion forming a fin-like fin by being wound around the heat transfer tube or the heat transfer base surface, a step of bending a bottom flange portion from a strip-shaped thin plate,
The combination of the fin part bending step of bending the thin plate so that the top is continuous, the fin part cutting step of making a cut in the bent thin plate part, and the material of the heat transfer tube and the fin material makes it necessary for the surface of the heat transfer tube. And a step of winding the fin-shaped fins around the heat transfer tube while applying tension to the fin members.

In order for the heat transfer device to efficiently exchange heat with air, it is important to increase the surface area of the heat transfer surface (fin) of the heat transfer device that comes into contact with the air. In the present invention, the fin-shaped fin wound around the heat transfer tube is made continuous, and when wound around the heat transfer tube, the fin-shaped fin is supported at two places on the left and right of the bottom flange. With such a configuration, the surface area of the fin that comes into contact with air is increased, the strength of the fin is increased, and the fin is hardly deformed.

[0013]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIG. [Embodiment 1] FIG. 1 is a perspective view of a fin-shaped winding fin having a curved top portion according to a first embodiment of the present invention. In FIG. 1, 1 is a fin-like fin, 2 is a bottom flange, and these fin-like fins 1 and bottom flange 2 are:
A fin portion wound around a heat transfer tube (not shown in FIG. 1), that is, a fin-shaped fin F1 is formed.

The fin-shaped fin F1 shown in FIG. 1 has the fin top 1a of the fin-shaped fin 1 continuous, and supports the fin-shaped fin 1 at two right and left portions of a bottom flange 2 formed by bending a bottom portion left and right. It has a shape and is formed such that the fin top 1a has a curved surface.

The fin top 1a has a curved surface because the fin top 1a has a curved surface so that the fin has a gate shape, and a space 1b is formed in the gate shape portion.
This is because not only the front surface of the fin but also the back surface of the fin can come into contact with the air for heat exchange.

[Embodiment 2] FIG. 2 shows a second embodiment of the present invention.
It is a perspective view of the fin-shaped winding fin which turned back the top part of the fin which concerns on 1st Embodiment. In FIG. 2, 1A is a fin-like fin and 2A is a bottom flange.
A, heat transfer tube (not shown in FIG. 2) at bottom flange 2A
To form a fin-shaped winding fin F2.

The fin-shaped winding fin F2 shown in FIG. 2 is formed by folding the fin top 1c of the fin-shaped fin 1A to be continuous,
It has a shape that supports the fin-like fins 1A at two places on the left and right sides of a bottom flange 2A formed by bending the bottom part right and left. In the structure in which the fin top 1c is folded back, the strength of the fin-shaped fin F2 when wound around the heat transfer tube is increased, and the fin is less likely to be deformed.

[Embodiment 3] FIG. 3 shows a third embodiment of the present invention.
It is a perspective view of the fin-shaped winding fin which the top part of the fin which concerns on 2nd Embodiment was a curved surface, and the bottom flange opened left and right. In the figure, members having the same reference numerals as those in FIG. 1 are members having the same functions as those in the first embodiment. In FIG. 3, 1 is a fin-like fin, 2
Is a bottom flange, and the fins 1 and 2 constitute a fin portion wound around a heat transfer tube (not shown in FIG. 3), that is, a fin-shaped winding fin F3.

In the fin-shaped fin F3 shown in FIG. 3, the fin top 1a is a curved surface, the distance between the left and right flanges of the bottom flange 2 is s, the width of the flange is w, and s <2.5w.
Is formed. By providing the interval s in the bottom flange 2, the space 1 b inside the gate is formed wide, and the ventilation resistance of the air flowing between the fins can be reduced. However, increasing the interval s between the flanges to reduce the ventilation resistance reduces the height h of the fin-like fins after being wound around the heat transfer tube.

In general, the heat transfer device is used by bending the heat transfer tubes after the fin-shaped fins are wound, so that the interval between the heat transfer tubes after the bend is reduced by the decrease in the height of the fin-shaped fins h.
The ventilation resistance increases due to the influence of the heat transfer tube spacing. Therefore, it is conceivable to widen the fin interval and increase the fin fin height h to increase the interval between the bent heat transfer tubes and reduce the ventilation resistance. Increasing the fin length increases the fin length and lowers the fin efficiency, and the amount of heat radiation does not increase despite the increase in the fin surface area.

That is, even if the fin height h is increased, the fin surface area is increased by that amount, the space between the heat transfer tubes is widened, and the ventilation resistance is reduced, the amount of exchanged heat is slightly increased, which is not advantageous from the viewpoint of manufacturing cost. Considering the balance between the heat transfer area and the ventilation resistance, by setting s <2.5 w, a practical heat transfer device can be obtained.

[Embodiment 4] FIG. 4 shows a fourth embodiment of the present invention.
It is a perspective view of the fin-shaped winding fin which turned the top part of the fin which concerns on 2nd Embodiment, and the bottom part flange opened to right and left. In the drawing, members having the same reference numerals as those in FIG. 2 are members having the same functions as those in the second embodiment. The embodiment shown in FIG. 4 has a structure in which the top 1c of the fin-shaped fin 1A of the fin-shaped wound fin F4 is folded back, and the interval s between the bottom flanges 2A is s <
The value of 2.5 w is for the same reason as in the embodiment of FIG.

[Embodiment 5] FIG. 5 shows a fifth embodiment of the present invention.
FIG. 6 is a cross-sectional view of the fin-shaped winding fin in which the bottom flange of the fin according to the embodiment is folded right and left, and FIG. 6 is a perspective view of the fin-shaped winding fin of FIG. In the embodiment shown in FIGS. 5 and 6, the bottom flange 2B of the fin-shaped winding fin F5 is folded right and left so that the left and right flange ends of the bottom flange 2B are in contact with each other. Thus, the inner interval t forming the portal shape of the fin-like fin 1B can be set to be constant within the range of the height h.

As a result, a space area is maintained inside the portal shape of the fin-like fin 1B, and the ventilation resistance of the air flowing inside the fin-like fin F5 can be reduced accordingly. In the embodiment shown here, the case where the interval t inside the portal shape of the fin-like fin 1B is maintained at t = constant, but the bottom flange is folded right and left, and as shown in FIG. Can be formed by folding back the top of. In that case, the difference from the present embodiment shown in FIGS. 5 and 6 is that the inner interval t constituting the portal shape of the fin-like fin 1B cannot be kept constant t within the range of the height h, or Since the fin tops have different shapes, the ventilation resistance is almost the same or slightly increased.

[Embodiment 6] FIG. 7 shows a sixth embodiment of the present invention.
It is a top view which shows the winding angle of the fin-shaped winding fin which concerns on embodiment. In the embodiment shown in FIG. 7, the winding angle of the fin-shaped fin 1 of the fin-shaped fin F wound around the heat transfer tube 3 by the bottom flange 2 is set to θ with respect to the air flow indicated by the thick arrow. Here, the root of the fin-shaped fin 1 wound is shaped so as to be parallel to the air flowing perpendicular to the heat transfer tube 3 by the winding angle θ.

By shaping the root of the fin-shaped fin 1 wound in this manner by the winding angle θ, the flow direction of the heat-exchanging air and the direction of the fin become parallel, and the ventilation resistance of the air is reduced. The air volume can be increased.

Embodiment 7 FIG. 8 shows a seventh embodiment of the present invention.
It is a top view which shows the space | interval of the bottom flange outer end of the fin-shaped winding fin which concerns on embodiment. In the embodiment shown in FIG. 8, a gap p is provided between the outer end of the bottom flange 2 of the fin-shaped fin 1 wound around the heat transfer tube 3 and the outer end of the adjacent bottom flange, and the gap p is arbitrarily selected. The winding fin tip in the longitudinal direction of the heat tube 3 can be arbitrarily selected.

According to the embodiment shown in FIG.
When there is a distribution of air flow velocity in the long axis direction, the fin pitch can be arbitrarily selected and the air flow distribution can be averaged by changing the ventilation resistance to improve the heat exchange efficiency of air. Can be.

[Embodiment 8] Next, FIG. 9 and FIG.
A method for manufacturing a heat transfer device having discontinuous fins will be described with reference to FIG. FIG. 9 is a flowchart of a manufacturing process of a heat transfer device having discontinuous fins according to an embodiment of the present invention,
FIG. 10 is a system diagram of a manufacturing apparatus of a heat transfer device having discontinuous fins for performing the manufacturing process of FIG. In FIG. 9, the steps of each manufacturing process are indicated by, and in FIG. 10 correspond to the step numbers in FIG.

9 and 10, F denotes a fin-shaped wound fin, 1 denotes a fin-shaped fin, 2 denotes a bottom flange, and 3 denotes a heat transfer tube. In the manufacturing apparatus of the heat transfer device of FIG. 10, reference numeral 4 denotes a strip-shaped thin roll, 5 denotes a shaft supporting the strip-shaped thin roll 4, 6 denotes a shaping die, 7 denotes a feed roll, 8 denotes a shaping roll, 9 denotes a roll with a cutter, 10 is a bonding material coating machine, 1
Reference numeral 1 denotes a driving device for winding the fin-shaped winding fin F around the heat transfer tube 3.

As shown in FIG. 9, the process of manufacturing a heat transfer device having discontinuous fins is performed in the state of a thin strip (step).
Bending step (step) for bending the bottom flange 2 from above, fin bending step (step) for bending the thin plate so that the top is continuous, and fin cutting step (step) for cutting the bent thin plate portion. The main steps include a step of applying a bonding material to the surface of the heat transfer tube 3 as necessary and a step (step) of winding the fin-shaped winding fin F in a helical shape around the heat transfer tube 3 while applying tension to the fin member. Process.

As shown in FIG. 10, a strip-shaped thin plate roll 4 which is a raw material of the fin-shaped fins is supported on a shaft 5. The strips (steps) drawn from the strip-shaped rolls 4 are fed into a group of feed rolls 7 (7-1, 7-2).
Dies 6 (general term for 6-1 and 6-2)
Pass through. The first shaping die 6-1 turns the thin plate end to shape the bottom flange 2 (step). The thin plate is bent by the second shaping die 6-2, the feed roll 7-2, the pair of shaping rolls 8 and the like so that the top is continuous, and the root of the fin-shaped winding fin F is shaped (step).

After passing through the shaping roll 8, when passing between the pair of cutter-equipped rolls 9, a cut is made at a predetermined width in the fin-like fin 1 except for the bottom flange 2 (step). Create the fin-shaped fin shape as shown. The heat transfer tube 3 is passed through the drive device 11, and at the same time, the heat transfer tube 3 is rotated by the drive device 11, and is advanced to the side of the notched fin-shaped fin material to be wound around the heat transfer tube 3. The drive device 11 gives a rotational motion and a linear velocity to the heat transfer tube 3 and can set the winding angle θ of the fin-shaped winding fin F arbitrarily by installing the heat transfer tube 3 at an angle with the axis of the heat transfer tube 3 ( Steps).

Here, the fin-like fin material is tensioned while being wound around the heat transfer tube 3 so that the bottom flange 2
Transfer tube 3 rotating so as to maintain uniform pressure
Supplied to The application of pressure is for the purpose of heat transfer and for providing a good contact between the bottom flange 2 and the heat transfer tube 3 of the fin-shaped fin F.

The bonding material applicator 10 shown in FIG. 10 is a device for applying a bonding material to the surface of the heat transfer tube 3 in order to bond the surface of the heat transfer tube 3 to the fin-shaped fins F wound in a helical shape. However, this bonding material is not always supplied, and it is determined whether to supply the bonding material as needed or not. For example, when supplying a joining material, in a combination in which dissimilar metals come into direct contact with each other, such as when the material of the heat transfer tube is a copper tube and the material of the fin-shaped winding fins is aluminum, one of the metals becomes longer due to electrolytic corrosion. After a long period of time and months, corrosion may occur. As described above, in the case of a combination of dissimilar metals, the joining material is applied to the surface of the heat transfer tube 3 from the joining material applicator 10 in order to prevent the electrolytic corrosion action, and the bottom flange 2 and the surface of the heat transfer tube 3 are directly connected. This is to prevent contact.

Also, by applying tension to the fin-shaped winding fins F, good contact is provided between the bottom flange 2 and the heat transfer tube 3 for the purpose of heat transfer. Has the function of fixing to. When the jointing material is not supplied, the heat transfer tube is an aluminum tube, and the fin-shaped fins are made of aluminum. No material supply is required.

In this manner, the heat transfer tube 3 wound with the fin-shaped winding fins F is bent and shaped (step) according to necessary design specifications, and the heat transfer device having such discontinuous fins is a heat exchanger such as a refrigerator. And so on.
In each of the above embodiments, an example has been described in which the heat transfer tube 3 employs a pipe having a circular cross section, but the present invention does not prevent adoption of a heat transfer base surface other than a circular surface.

According to each of the above embodiments, the top of the fins is continuous, and the fins are supported at two places on the left and right sides of the bottom flange. Since the fins can be changed, the fin surface area in contact with air is increased, the strength of the fins is increased, the fins are less likely to be deformed, and a heat transfer device that does not increase the ventilation resistance of air can be provided.

[0039]

As described above in detail, according to the present invention, while increasing the fin surface area in contact with air,
It is possible to provide a heat transfer device having a discontinuous fin that can increase the strength of the fin to prevent an increase in ventilation resistance due to deformation of the fin, and that can efficiently secure a predetermined air volume, and a method of manufacturing the same.

[Brief description of the drawings]

FIG. 1 is a perspective view of a fin-shaped wound fin having a curved top portion according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a fin-shaped winding fin obtained by turning a top of a fin according to a second embodiment of the present invention.

FIG. 3 is a perspective view of a fin-shaped winding fin according to a third embodiment of the present invention, in which the top of the fin is curved and the bottom flange is opened to the left and right.

FIG. 4 is a perspective view of a fin-shaped winding fin according to a fourth embodiment of the present invention, in which the top of the fin is turned up and the bottom flange is opened right and left.

FIG. 5 is a cross-sectional view of a fin-shaped winding fin in which a bottom flange of the fin according to a fifth embodiment of the present invention is folded right and left.

FIG. 6 is a perspective view of the fin-shaped winding fin of FIG. 5;

FIG. 7 is a plan view showing a winding angle of a fin-shaped winding fin according to a sixth embodiment of the present invention.

FIG. 8 is a plan view showing an interval between outer ends of a bottom flange of a fin-shaped fin according to a seventh embodiment of the present invention.

FIG. 9 is a flowchart of a manufacturing process of a heat transfer device having discontinuous fins according to an embodiment of the present invention.

10 is a system diagram of a manufacturing apparatus of a heat transfer device having a discontinuous fin for performing the manufacturing process of FIG. 9;

FIG. 11 is a perspective view showing a conventional strip-shaped winding fin.

FIG. 12 is a partially cutaway sectional view of the heat transfer device in which the fins of FIG. 11 are wound around a heat transfer tube.

[Explanation of symbols]

F, F1, F2, F3, F4, F5 ... fin-shaped fins, 1,1A, 1B ... fin-shaped fins, 2, 2A, 2B ...
Bottom flange, 3 ... heat transfer tube, h: fin-shaped fin height, s
… Spacing between bottom flanges, w… width of bottom flange, θ… wrapping angle of fin-shaped winding fins, 4… strip-shaped thin plate roll, 6
-1, 6-2: shaping die, 7-1, 7-2: feed roll, 8: shaping roll, 9: roll with cutter, 10 ...
Bonding material applicator, 11 ... Drive device.

Claims (8)

[Claims] 1. A heat transfer system comprising: a heat transfer tube or a heat transfer base surface similar to the heat transfer tube; and a fin portion having a flat bottom flange and being wound around the heat transfer tube or the heat transfer base surface to form a fin-like fin. In the device, the wound fin portion has a shape in which the top of the fin-shaped fin is continuous, and the fin-shaped fin is supported at two places on the left and right sides of a bottom flange formed by bending a bottom portion left and right. A heat transfer device having a discontinuous fin, wherein a top portion has a curved surface. 2. A heat transfer system comprising: a heat transfer tube or a heat transfer base surface similar to the heat transfer tube; and a fin portion having a flat bottom flange and being wound around the heat transfer tube or the heat transfer base surface to form a fin-like fin. In the device, the wound fin portion has a shape in which the top of the fin-shaped fin is continuous, and the fin-shaped fin is supported at two places on the left and right sides of a bottom flange formed by bending a bottom portion left and right. A heat transfer device having discontinuous fins, the top of which is folded back. 3. An interval between left and right flanges of a bottom flange in a fin-like fin is represented by s, and a flange width is represented by w.
The heat transfer device having discontinuous fins according to claim 1 or 2, wherein the heat transfer device is formed to have a width of <2.5 w. 4. The heat transfer device having discontinuous fins according to claim 1, wherein each of the right and left flanges of the bottom flange of the fins is folded right and left with respect to the fins. 5. A space region is formed between the right and left fins of the fins, and when the distance between the left and right fins is t, the distance between the fins is within a range of approximately the height of the fins. 5. The heat transfer device with discontinuous fins according to claim 4, wherein the heat transfer device is constant. 6. The fin winding angle θ so that the fin-like fin of the fin portion and the axis of the heat transfer tube are orthogonal to each other.
6. A heat transfer device having a discontinuous fin according to claim 1, wherein the base of the fin is a shaped fin. 7. A space p between an outer end of a bottom flange of the fin portion and an outer end of an adjacent bottom flange is set to a desired value in the axial direction of the heat transfer tube.
6. A heat transfer device having a discontinuous fin according to any one of claims 5 to 5. 8. A discontinuity comprising a heat transfer tube or a heat transfer base surface similar to the heat transfer tube, and a fin portion having a flat bottom flange and being wound around the heat transfer tube or the heat transfer base surface to form a fin-like fin. In a method for manufacturing a heat transfer device having fins, a step of bending a bottom flange portion from a strip-shaped thin plate, a step of bending a thin plate so that a top portion is continuous, and a step of cutting a fin portion for making a cut in the bent thin plate portion And a step of applying a bonding material to the surface of the heat transfer tube as necessary by combining the material of the heat transfer tube and the material of the fin, and winding the fin-shaped fin around the heat transfer tube while applying tension to the fin member. A method of manufacturing a heat transfer device having discontinuous fins.