JP6479252B2 - Heat exchanger - Google Patents

Description

  The present invention relates to a fin-and-tube heat exchanger using a flat tube.

  The fin-and-tube heat exchanger using a conventional flat tube regulates the position by fitting the flat tube between the restraining pins, holds the fin on the mounting drum that performs rotational movement, and rotates the mounting drum. However, it was manufactured using the manufacturing apparatus which mounts a fin on a flat tube sequentially (for example, refer patent document 1).

JP 2013-59847 A

In the heat exchanger disclosed in Patent Document 1, a force is applied to the flat tube to push the closed end portion of the U-shaped notch for fitting the fin into the flat tube. Therefore, when the restraining pin that restricts the position of the flat tube is removed, there is a problem that the fin is deformed and warpage occurs in the step direction of the plurality of flat tubes arranged.
And in the manufacturing stage which mounts a fin to a flat tube, when the curvature of the step direction of the flat tube became large, it might become impossible to insert a fin into a flat tube. When the heat exchanger manufacturing apparatus is operated in a state in which the fins cannot be inserted into the flat tube, there is a possibility that the fin mounting plate and the flat tube collide with each other and the manufacturing apparatus may stop and break down.

  The present invention has been made to solve the above-described problems, and suppresses a force to push and widen the closed end of the notch portion of the fin when the fin is fitted to the flat tube. The shape of the notch that can be used is adopted to reduce warping in the step direction of the flat tube and to prevent damage to the flat tube and the fin mounting plate.

A heat exchanger according to the present invention is fixed to a plurality of flat tubes having a flat cross-section, which serve as a flow path of a heat conduction medium, and the flat surface is orthogonal to the flow direction of the flat tubes. A plurality of fins arranged at intervals in the flow path direction, the fin having a cutout portion for fitting the flat tube and a fin collar rising from an edge portion of the cutout portion. The opening end of the notch is larger than the outer width of the flat tube, the opening shape of the notch is U-shaped, and the semicircular portion serving as the closed end of the notch is formed on the flat tube. one semicircular end fitted, the fin collar, and the fin collar inclined surface which rises inclined with respect to the fin plane from the edge of the cutout portion, bending from an end portion of the fin collar inclined plane Rising, it is characterized in that it has a fin collar end surface portion in surface contact with the outer surface of the flat tube.

  According to the heat exchanger of this invention, since the opening end of the notch is larger than the outer width of the flat tube, the deformation of the fin when the fin is fitted to the flat tube can be suppressed. Since the end face part of the collar fin collar is in surface contact with the outer surface of the flat tube, the fin and the flat tube can be fixed, and thermal conductivity between the two can be ensured.

It is a perspective view of the heat exchanger of this invention. It is a perspective view which shows the notch part shape of the fin of the heat exchanger of Embodiment 1 of this invention. It is a schematic block diagram of the manufacturing apparatus of the heat exchanger of this invention. It is a perspective view which shows the flat tube restraint part used for manufacture of the heat exchanger of this invention. It is a sectional side view which shows the assembly | attachment of the fin to the flat tube of the heat exchanger of Embodiment 1 of this invention. It is sectional drawing which shows the notch part shape of the fin of the heat exchanger of Embodiment 1 of this invention. It is a perspective view which shows the notch part shape of the fin of the heat exchanger of Embodiment 2 of this invention, and a sectional side view which shows the fin assembly to a flat tube. It is a sectional side view which shows the assembly | attachment of the fin to the flat tube of the heat exchanger of Embodiment 3 of this invention. It is a reference perspective view which shows the notch part shape of a fin required for description of this invention. It is a reference perspective view which shows the curvature of the fin required for description of this invention. It is a perspective view which shows the notch part shape of the fin of the heat exchanger of Embodiment 4 of this invention.

Embodiment 1 FIG.
A heat exchanger according to Embodiment 1 of the present invention will be described with reference to FIGS.
FIG. 1 is a perspective view showing a heat exchanger 100 using a flat tube 1 having a flat cross section formed by a manufacturing method and a manufacturing apparatus to which the present invention is applied. In FIG. 1, a heat exchanger 100 is a fin-and-tube type using a flat tube 1, and includes a flat tube 1 and a fin 2, and the flat tube 1 is a notch 21 a provided in the fin 2. Are fitted to each other at this fitting portion.
The fins 2 have a flat plate shape, and a plurality of fins 2 are mounted in parallel in the longitudinal direction of the flat tube 1, that is, in the direction of the flow path of the heat conducting medium at a constant interval. The flat tube 1 has a flat cross section perpendicular to the flow path direction, a plurality of the flat tubes 1 are arranged in parallel, and the outer peripheral planes (outer surfaces) of the adjacent flat tubes 1 face each other. A fluid serving as a heat transfer medium such as a refrigerant is flowed.

FIG. 2 is a perspective view showing the shape of the notch 21a of the fin 2 constituting the heat exchanger 100 of the present invention. A plurality of notches 21a are provided at predetermined intervals on the end side along the longitudinal direction of the fin 2, but as shown in FIG. 2, one notch 21a has a width (external width) of the flat tube 1. W1) The slit is formed to have a wider width (open end width W2).
The opening shape of the cutout portion 21a is U-shaped, and in a state where the fin 2 and the flat tube 1 are fitted, the semicircular portion (R portion) serving as the closed end of the cutout portion 21a has a flat shape. One semicircular end of the tube 1 is fitted.

In addition, slits (not shown) are formed in the flat surface portions 2a partitioned through the notches 21a.
A fin collar 22 is formed on the same surface side of the fin 2 so as to rise along the edge of each notch 21a and to bring the flat tube 1 and the fin 2 into close contact with each other.
The fin collar 22 and a slit (not shown) are formed so as to protrude in the same direction with respect to the surface of the fin 2.

As described above, the fin 2 according to the first embodiment of the present invention includes the notch portion 21a into which the flat tube 1 is fitted, and the fin collar 22 that rises from the edge of the notch portion 21a toward the outer surface of the flat tube 1. And the width W2 of the opening end of the cutout portion 21a is offset so as to expand from the semicircular portion of the closed end of the cutout portion 21a so as to be larger than the outer width W1 of the flat tube 1. ing. The fin collar 22 is bent from the edge of the notch portion 21a so as to be inclined with respect to the fin plane, and is bent from the end of the fin collar inclined surface portion 22a, and is in surface contact with the outer surface of the flat tube 1. And a fin collar end surface portion 22b.
Therefore, the edge of the fin collar 22 of the fin 2 does not come into contact with the outer surface of the flat tube 1 even when the flat tube 1 is fitted.
The flat tube 1 and the fin 2 are fixed by joining the outer surface of the flat tube 1 and the fin collar end surface portion 22b of the fin 2, and heat conductivity can be ensured by the surface contact between the two.

  Here, the fin collar inclined surface portion 22a of the fin 2 extends from two parallel linear edges from the open end to the closed end of the U-shaped cutout portion 21a, and the flat portion 2a of the fin 2 In contrast, it is formed in a state of rising toward the outer surface of the flat tube 1 at an angle of less than 90 degrees. At this time, as shown in FIG. 2, the angle formed by the surface on the extension of the flat portion 2a of the fin 2 and the lower surface of the fin collar inclined surface portion 22a is less than 90 degrees. In other words, the angle formed by the upper surface of the flat portion 2a of the fin 2 and the upper surface of the fin collar inclined surface portion 22a is an angle (obtuse angle) larger than 90 degrees.

  In addition, as described above, the flat tube 1 has a fluid such as water or refrigerant flowing therein, but the cross section is flat so that the water resistance can be increased without increasing the ventilation resistance compared to the circular tube. The amount of fluid such as refrigerant can be increased. Thereby, the performance as the heat exchanger 100 can be improved. That is, when compared as the same performance, the heat exchanger 100 using the flat tube 1 has an advantage that the size can be reduced as compared with the heat exchanger using the conventional circular tube.

As shown in FIG. 1, the fins 2 are arranged across a plurality of flat tubes 1 juxtaposed, with the main plane orthogonal to the flow direction of the flat tubes 1 and spaced apart in the flow direction, By mounting the flat tubes 1 individually in the respective cutout portions 21a, the flat tubes 1 are mounted on the outer peripheral surface and the outer surface of the flat tubes 1. Note that the direction in which the flat tubes 1 are arranged perpendicular to the flow direction of the flat tubes 1 is the step direction of the flat tubes 1.
As shown in FIG. 1, the step direction in which the plurality of flat tubes 1 are juxtaposed is the same as the direction in which the cutout portions 21a of the plurality of fins 2 are arranged. Needless to say, the pitch at which the portions 21a are arranged is the same.

  And as shown in FIG. 1, in the state where the plurality of fins 2 formed in the same shape are mounted on the outer peripheral surface of the plurality of flat tubes 1 at a predetermined interval and the heat exchanger 100 is operated, The air flowing in the flat tube 1 absorbs heat from the atmosphere through the flat tube 1 and the plurality of fins 2 to cool the atmosphere, and conversely, the air is warmed by releasing heat.

  FIG. 3 is a conceptual diagram showing an apparatus for manufacturing the heat exchanger 100 to which the present invention is applied. In the manufacturing method of the heat exchanger 100 using the manufacturing apparatus of FIG. 3, a plurality of fins 2 are provided on the outer peripheral surface of the flat tube 1 through which a fluid as a heat conduction medium flows, and the flow direction of the flat tube 1 ( And a moving function for relatively moving the fin 2 and the flat tube 1 to be attached to the flat tube 1 in the length direction of the flat tube 1, and the fin 2. A fin mounting function for mounting the flat tube 1 one by one and a flat tube restraining function for restraining the position in the width direction of the flat tube 1 when performing fin mounting by the fin mounting function are provided.

  In the manufacture of the heat exchanger 100, before the fins 2 are assembled, a plurality of flat tubes 1 are arranged in parallel at predetermined intervals according to the required cooling / heating performance. Then, the flat tube restraining function restrains all of the juxtaposed flat tubes 1 and the fin mounting function attaches the required number of fins 2 to the constrained flat tube 1 at a predetermined interval. To manufacture fin and tube.

  The fin mounting function will be described in detail with reference to FIG. The drum 122 constituting the manufacturing apparatus rotates around the axis X in the direction of arrow A, that is, in the clockwise direction in FIG. As the rotation drive source, an optimal one such as a servo motor is selected as appropriate. A plurality (eight in FIG. 3) of fin mounting plates 121 installed at predetermined intervals in the circumferential direction of the drum 122 are provided on the peripheral portion of the drum 122. Each fin mounting plate 121 performs a circular motion around the axis X as the drum 122 rotates. The drum 122 is repeatedly operated and stopped every 1/8 rotation, that is, at a 45-degree pitch. At this time, an optimal value is appropriately selected for the rotation speed. As the drum 122 rotates, for example, the fin mounting plate 121 that has reached the top of the drum 122 receives and holds one fin 2 supplied from another mechanism (not shown). The holding of the fin 2 by the fin mounting plate 121 employs, for example, vacuum suction that sucks the fin 2 using air suction.

The fin mounting plate 121 holding the fins 2 rotates in the direction of the arrow A around the axis X as the drum 122 rotates halfway, and is perpendicular to the flat tube 1 at the lower part (below the drum 122). Stop in posture.
Then, the fin 2 can be attached to the outer peripheral surface of the flat tube 1 by separating the fin 2 held by the vacuum suction from the fin attachment plate 121 by vacuum break.
Next, when the drum 122 further rotates, the fin mounting plate 121 separated from the fin 2 rotates. Here, the fin mounting plate 121 operates so as not to interfere with the fin 2 mounted on the flat tube 1. There is a need. For this operation, a cam follower 124 is attached to the fin mounting plate 121. Further, a cam (not shown) is installed at the rotation center portion of the drum 122. As the drum 122 rotates, the cam follower 124 follows the cam to control the posture of the fin mounting plate 121 so that the fin mounting plate 121 does not interfere with the fin 2.

  Next, the movement function of the flat tube 1 will be described in detail. In order to hold a plurality of flat tubes 1, a flat tube restraining portion 300 as shown in FIG. 4 is used. FIG. 4 is a perspective view showing a flat tube restraining portion 300 having a flat tube restraining function, which is a part of the manufacturing apparatus of the heat exchanger 100 to which the present invention is applied. The base of the flat tube restraining portion 300 is a base plate 302, and the flat tube 1 is placed between the restraining pins 301 planted on the base plate 302 so that the major axis direction of the cross section is vertical. Retained. And in order to move the position on the flat tube 1 which mounts the fin 2 with respect to the fin mounting position which is right under the rotation direction of the drum 122 said in FIG. 3, the flat tube restraint part 300 is made into predetermined | prescribed speed. A predetermined distance is moved in the direction of arrow B. As a driving source for the flat tube restraint unit 300, an optimal one such as a servo motor is appropriately selected. Since the movement distance in the B direction varies depending on the product specifications, an optimal value is appropriately selected along with the movement speed, and can be easily changed on the operation panel for operating the apparatus. Needless to say, the flat tube 1 may be fixed and the drum 122 may be moved in the direction opposite to the arrow B.

In FIG. 4, the flat tube restraint portion 300 includes a plurality of restraint pins 301 and a base plate 302 provided with holes (not shown) for fixing these restraint pins 301 at an equal pitch. Yes. The plurality of restraining pins 301 are fixed by being partially attached to holes provided in a line on one side and the other side of the surface of the base plate 302. Two restraining pins 301 adjacent to each other on one side and the other side of the surface of the base plate 302 restrict the horizontal position of the flat tube 1 on the surface of the base plate 302.
Thereby, the several flat tube 1 is arrange | equalized at equal pitches in the width direction of the flat tube 1. The flat tube restraining function moves by the moving function while always restraining (contacting) the flat tube 1 while performing the fin mounting operation as described above. That is, the restraining pin 301 and the flat tube 1 are in contact with each other. Therefore, a material excellent in wear resistance is selected for the restraining pin 301.

In the flat tube restraint portion 300 shown in FIG. 4, the spacing between the restraint pins 301 located on both sides of one flat tube 1 is set slightly wider than the width of the flat tube 1. The flat tube restraint 300 is easily attached and detached.
Here, in the example of FIG. 4, the case where the constraining pins 301 are arranged in two rows and the pins located on both sides of the plurality of flat tubes 1 are set to be in the same row is shown. Three or more rows of restraining pins 301 may be arranged so that three or more places are locked in the direction of one flow path. Further, the constraining pins located on both sides of the plurality of flat tubes 1 may be arranged in a zigzag so as to form, for example, a staggered pattern without forming the same row. Further, instead of the restraining pin 301, for example, a bearing or the like that rotates in the direction in which the flat tube 1 operates by a moving function may be selected and used.

3, after the fin 2 is mounted on the flat tube 1, the flat tube 1 is moved a predetermined distance by the moving function, and the next fin 2 is mounted on the flat tube 1 again by the fin mounting function. To do. A series of cycles (a cycle in which the fin 2 is attached to the flat tube 1 and the flat tube 1 is moved) are continuously performed a predetermined number of times, so that a plurality of fins 2 are attached on the flat tube 1 at regular intervals, for example. The heat exchanger 100 made to be able to be manufactured can be manufactured.

Next, FIG. 5 shows a side sectional view of the heat exchanger 100 before the fins 2 are attached to the flat tube 1 and after the fins 2 are attached. FIG. 5 is a view showing the assembly of the fin 2 to the flat tube 1 of the heat exchanger 100. As shown in the upper diagram of FIG. 5, the fin 2 does not have a structure in which the edge of the notch 21 a is pressed against the outer surface of the flat tube 1 before the fin is mounted. Therefore, even when the fin 2 is attached to the flat tube 1, as shown in the lower diagram of FIG. 5, it is difficult to generate a force that pushes and widens the closed end of the notch 21 a of the fin 2. For this reason, the heat exchanger 100 does not warp in the longitudinal direction of the fins 2 or the inclination of the flat tube 1 due to the influence of the warp.
Therefore, in the manufacturing process of the heat exchanger 100, even when the fins 2 are sequentially attached to the flat tubes 1, even if the flat tube restraining portion 300 is retracted and removed from the heat exchanger 100 being manufactured, the fins are attached. Since the plate 121 and the flat tube 1 do not interfere with each other, the fin 2 can be mounted up to the fin mounting end portion of the flat tube 1 to complete the heat exchanger 100.

Next, the modification of the notch part 21a of the fin 2 is demonstrated using FIG. FIGS. 6A and 6B are cross-sectional views of the fin 2 along the flow direction of the flat tube 1 and the width direction of the open end of the notch 21a.
As described above, the fin collar 22 includes the fin collar inclined surface portion 22a. As shown in FIG. 6A, the fin collar inclined surface portion 22a includes a fin collar inclined surface portion 22aa composed of a plane. In addition, as shown in FIG. 6B, a fin collar inclined surface portion 22ab made of a curved surface may be used. The curved fin-shaped inclined surface portion 22ab of FIG. 6B has a protruding direction on the side of the cutout portion 21a, but can be used by changing its shape, such as a curved shape protruding on the opposite side. Needless to say.

  As shown in FIGS. 6A and 6B, the fin collar inclined surface portions 22aa and 22ab are at an angle of less than 90 degrees with respect to the surface on the extension of the planar portion 2a of the fin 2 from the edge portion of the notch portion 21a. It is formed by bending, and is in surface contact with the outer surface of the flat tube 1 at the ends of the fin collar inclined surface portions 22aa and 22ab. Further, the end portions of the fin collar inclined surface portions 22aa and 22ab are further bent to form the fin collar end surface portion 22b, and the plane of the fin collar end surface portion 22b is in surface contact with the outer surface of the flat tube 1. Therefore, it is possible to obtain a state in which the fin collar end face portion 22b is joined to the flat tube 1 with a sufficient area, thereby improving the heat exchange performance of the heat exchanger 100.

  Here, in order to compare with the first embodiment of the present invention, FIG. 9 shows a perspective view of a fin 200 as a comparative example. As shown in FIG. 9, the fin 200 as a comparative example is provided with a narrow notch 210 whose opening end is smaller than the outer width of the flat tube 1. The fin 200 is formed such that the width W3 of the opening end of the narrow notch 210 is slightly smaller than the width W1 of the flat tube 1 and further, from the edge of the narrow notch 210 to the plane. Since the fin collar 220 is formed so as to rise perpendicularly to the portion 200a, it is possible to suppress positional deviation when the fin 2 is assembled to the flat tube 1.

Next, FIG. 10 shows a cross-sectional view when the fin 200 of FIG. 9 is attached to the flat tube 1. As shown in the upper diagram of FIG. 10, the fin 200 is not deformed such as a warp before being attached to the flat tube 1.
As shown in the middle diagram of FIG. 10, when the fin 200 is fitted to the flat tube 1, the edge of the narrow notch 210 pushes the outer surface of the flat tube 1 and the narrow notch 210 is closed. A force is exerted to push and spread the end, but this force is regulated by the restraining pin 301 since the flat tube restraining portion 300 (not shown) holds the flat tube 1, and at this stage, the fin 200 is deformed. Is not seen.
However, as shown in the lower diagram of FIG. 10, when the flat tube 1 is removed from the flat tube restraining portion 300, the width of the opening end of the narrow notch 210 is widened and warping occurs in the longitudinal direction of the fin 200. . The force that pushes and spreads the narrow notch 210 becomes stronger as it goes to the outside of the heat exchanger 100, so that there is nothing to cancel the force, and the flat tube 1 on the outside becomes inclined, and the flat tube A change occurs in the juxtaposed state of 1.

In the comparative example shown in FIGS. 9 and 10, after the fin is mounted, unnecessary stress is generated between the flat tube 1 to be fitted and the fin 200 due to the shape of the narrow notch 210. In the heat exchanger 100 according to the first embodiment of the present invention, the opening end width W2 of the shape of the notch 21a is set to be larger than the width W1 of the flat tube 1 to suppress generation of unnecessary stress. It becomes possible to improve the property. Furthermore, in the heat exchanger 100 according to the first embodiment of the present invention, the plane of the fin collar end surface portion 22b and the outer surface of the flat tube 1 are provided in parallel, and these surfaces are in surface contact with each other. Therefore, it is possible to secure both of them and heat conductivity.

Embodiment 2. FIG.
FIG. 7 is a conceptual diagram showing the heat exchanger 100 according to the second embodiment of the present invention, and FIG. 7A is a perspective view showing the shape of the notch 21b of the fin 2, and FIG. ) Is a side sectional view showing an assembled state of the fin 2 to the flat tube 1.
In the first embodiment described above, the width W2 of the opening end of the cutout portion 21a is larger than the width W1 of the closed end, and the two linear edges of the U-shaped cutout portion 21a are parallel to each other. However, the notch 21b of the fin 2 according to the second embodiment has a U-shaped width W2 at the opening end of the notch 21b as shown in FIG. Are larger than the closed end width W1 equal to the semicircular diameter, and the two straight edges of the notch 21b are located on non-parallel lines connecting the open end and the closed end, respectively. ing. The opening width of the notch 21b is larger as it is closer to the opening end, and is smaller as it is closer to the closing end.

  Further, as shown in FIG. 7 (a), the opening shape of the cutout portion 21b is formed so as to be closer to the opening end, so the distance between the edge portion of the cutout portion 21b and the outer surface of the flat tube 1 is also as follows. The closer to the closed end, the larger. Therefore, the shape of the fin collar 23 also changes accordingly, and the closer to the opening end of the cutout portion 21b, the larger the rising width of the fin collar inclined surface portion 23a, and the closer to the closed end of the cutout portion 21b, The fin collar inclined surface portion 23a is formed to have a small rising width.

The fin collar end surface portion 23b is bent from the end portion of the fin collar inclined surface portion 23a in the same manner as the fin collar end surface portion 22b of the first embodiment.
However, as for the size of the rising width of the fin collar inclined surface portion 23a, FIG. 7A shows an example in which it is larger as it is closer to the opening end of the notch portion 21b and smaller as it is closer to the closed end. At the stage where the fin 2 is manufactured by press molding, the rising dimension (width) of the fin collar end face part 23b can be adjusted to be the same dimension regardless of the depth of the notch part 21b. In addition, as a modification of the fin collar end surface portion 23b, it is needless to say that the bonding area can be increased by increasing the dimension (width) closer to the closed end of the cutout portion 21b.

As described above, the shape of the notch 21b of the fin 2 is not necessarily limited to the constant width (W2) as shown in FIG. 2, and the width W1 of the flat tube 1 as shown in FIG. 7 (a). The width W2 of the opening end may be larger than that of the opening, and this shape suppresses the generation of force that pushes and widens the closed end of the notch 21b when the fin 2 is attached. And the same effect as in the first embodiment can be obtained. Moreover, the load applied when the fins 2 are attached to the flat tube 1 can be reduced.
And the flat tube 1 after attaching the fin 2 with respect to the flat tube 1 by obtaining the state which fits the fin 2 with the flat tube 1 without gap in the position near the closed end of the notch part 21b. It is possible to ensure the contact between the fin collar 23 and the fin collar 23.

Embodiment 3 FIG.
FIG. 8 is a conceptual diagram showing a heat exchanger 100 according to Embodiment 3 of the present invention, and the fin 2 to the flat tube 1 when one fin 2 is used in combination with a plurality of cutout portions. It is a sectional side view which shows the assembly | attachment state of.
In the first embodiment or the second embodiment described above, the example in which the plurality of cutout portions 21a or 21b formed in the fin 2 are all of the same shape is shown. However, the plurality of cutout portions formed in one fin 2 do not have to have the same shape, and can be used in combination with cutout portions having different shapes.

For example, as shown in FIG. 8, two types of notch portions having different opening widths are adopted, and the narrow notch portion 210 shown as the comparative example of the first embodiment and the notch shown in the second embodiment. The fins 2 in which the portions 21b are alternately arranged can be used. It goes without saying that the advantages of both can be taken in by arranging the narrow notches 210 and the notches 21b alternately.
Not only this but the notch part provided in the fin 2 is good also as three or more types, and what is necessary is just to select and employ | adopt an optimal thing suitably. Further, regarding the arrangement of the cutout portions on one fin 2, it is not always necessary to alternately form different types of cutout portions. For example, changing the shape of the cutout portions every two, It goes without saying that the shape of the notch can be properly used depending on the part.

  The notches 21a and 21b of the fin 2 shown in the first embodiment and the second embodiment do not generate a force to spread the closed end side of the fin 2, but on the other hand, between the flat tube 1 and the fin 2 There is a tendency for the contact force to decrease. Therefore, in order to compensate for the contact force between the flat tube 1 and the fin 2, as shown in FIG. 8, a part of the plurality of notches is formed in the fin 2 with a narrow width W 3 that is slightly narrower than the width W 1 of the flat tube 1. By replacing with the notch portion 210, the contact force with the flat tube 1 can be increased, and the positional deviation between the flat tube 1 and the fin 2 can be suppressed.

  Moreover, as shown in FIG. 1, in the heat exchanger 100, the fin 2 with which the flat tube 1 is mounted | worn is many pieces. In the above-described first and second embodiments, it is assumed that the necessary number of fins 2 having the same shape are prepared and sequentially assembled to the flat tube 1, but the fins 2 attached to one heat exchanger 100 are: A plurality of types of fins 2 having different notch shape can be used in combination. For example, the fin 2 provided only with the notch 21a shown in FIG. 2 of the first embodiment, and the fin 2 provided only with the notch 21b shown in FIG. 7A of the second embodiment. The fin 2 in which the two narrow cutouts 210 and 21b having the two shapes shown in the side view in FIG. 8 are alternately arranged, and the necessary number of fins 2 are assembled to the flat tube 1 in order. It is also possible to form About the kind of fin 2, and the assembly | attachment order to the flat tube 1, it can change variously by changing the supply order of the fin 2 to a manufacturing apparatus.

Embodiment 4 FIG.
11 (a), 11 (b), and 11 (c) are perspective views of the fin 2 according to the fourth embodiment of the present invention, and show the shapes of the cutout portions 21c, 21d, and 21e, respectively.
In the first embodiment and the second embodiment described above, the fin collars 22 and 23 are provided symmetrically with respect to the center line passing through the notch 21a or the closed end vertex of the notch 21b, and the left and right fin collar shapes are provided. An example where is the same. In the fourth embodiment, a case will be described in which the fin collars rising from the left and right edges of the notches 21c, 21d, and 21e have different shapes.
As shown in FIG. 11A, a fin collar 22 is formed on the left edge of the notch 21c of the fin 2, and a fin collar 23 is formed on the right edge.

  The cutout portion 21c of the fin 2 shown in FIG. 11 (a) has an opening end larger than the closed end (semicircular portion), and two cutout portions 21c that fit into the main plane of the flat tube 1 are provided. Of the straight edges, the edge on the side where the fin collar 22 is formed is located on a line parallel to the main plane of the flat tube 1, and the edge on the side where the other fin collar 23 is formed is It is located on a line connecting the open end and the closed end of the notch 21c. A broken line extending from a contact point between the closed end of the notch 21 c and the fin collar 23 indicates a line parallel to the edge of the fin collar 22. The opening width W4 on the closed end side is offset in a direction extending from the end of the semicircular portion (width W1) of the closed end of the notch 21c, and the offset width is larger than the outer width W1 of the flat tube 1 by the offset amount. Is also formed large. The opening width W2 of the notch 21c is wider than the opening width W4 on the closed end side by the extent of the fin collar 23.

  In the structure of the fin 2 shown in FIG. 11A, the fin collars 22 and 23 having the fin collar inclined surface portions 22a and 23a and the fin collar end surface portions 22b and 23b are arranged on the left and right sides of the notch portion 21c. While suppressing the deformation of the fin 2 at the time of assembling to the flat tube 1 at the left and right of the notch 21c, the fin 2 and the flat tube 1 can be stably fixed.

Moreover, as shown in FIG.11 (b), among the two linear edge parts of the notch part of the fin 2 with which the flat tube 1 is fitted, the left edge part has the fin collar of the first embodiment. 22 is formed, and a fin collar 220 having a conventional structure is formed at the right edge.
In the fin 2 provided with the fin collar 22, the opening end of the cutout portion 21d is larger than the closed end, and the fin collars 22 and 220 rising from the two linear edges of the cutout portion 21d have different shapes. The edge on the side where the fin collar 22 is formed is located on a line connecting the position where the cutout portion 21d is widened from the semicircular portion at the closed end and the opening end, and the fin collar 220 is formed. The edge on the side is located on a line connecting the open end and the closed end, and both are arranged in parallel. In the cutout portion 21d, the opening end width and the opening width W4 on the closed end side have the same dimensions and are larger than the width W1 of the closed end (semicircular portion).

Further, as shown in FIG. 11C, the fin collar 23 of the second embodiment is formed on the left edge of the notch 21e of the fin 2, and the fin collar 220 is formed on the right edge. A structure is also possible. The opening end width W4 of the notch 21e is larger than the closed end width W1 by the extent of the fin collar 23.
Needless to say, the cutout portions 21c, 21d, and 21e of the fin 2 shown in FIGS. 11 (a), 11 (b), and 11 (c) do not have any problem even if the fin collars are switched on the left and right.

Thus, by adopting the shape of the notches 21c, 21d, and 21e of the fin 2 shown in FIGS. 11A, 11B, and 11C, when the fin 2 is mounted, the first embodiment and Similarly to the second embodiment, it is possible to suppress the generation of force that tries to push and widen the closed ends of the notches 21c, 21d, and 21e, and to stably fix the fin 2 to the flat tube 1 Is possible.
Moreover, it is needless to say that notches 21c, 21d, and 21e shown in FIG. 11 can be formed in the fin 2 in any order as in the third embodiment.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

Claims (9)

A plurality of flat tubes having a flat cross section, which serve as a flow path for the heat transfer medium, are fixed to the flat tube, the main plane is orthogonal to the flow direction of the flat tube, and the flow direction is spaced apart. With a plurality of fins arranged,
The fin has a notch for fitting the flat tube and a fin collar that rises from an edge of the notch,
The opening end of the notch is larger than the outer width of the flat tube,
The opening shape of the cutout portion is U-shaped, and one semicircular end portion of the flat tube is fitted to the semicircular shape portion that becomes the closed end of the cutout portion,
The fin collar includes a fin collar inclined surface portion that is inclined with respect to the fin plane from the edge of the notch portion, a fin that is bent from an end portion of the fin collar inclined surface portion, and is in surface contact with the outer surface of the flat tube. A heat exchanger having a collar end face portion. Open end of the cutout portion is larger than the closed end, the heat exchanger according to claim 1, wherein the two straight edges of the cutout portions are parallel. The opening end of the notch is larger than the closing end, and two linear edges of the notch are respectively located on a line connecting the opening end and the closing end. Item 2. The heat exchanger according to Item 1 . The fin collar inclined surface portion and the fin collar end surface portion, the heat exchanger of any one of claims 1 3, characterized in that both plane. The heat exchanger according to any one of claims 1 to 3 , wherein the fin collar inclined surface portion is a curved surface, and the fin collar end surface portion is a flat surface. The heat exchanger according to any one of claims 1 to 5 , wherein the fin has a narrow cutout portion whose opening end is smaller than the outer width of the flat tube in addition to the cutout portion. The heat exchanger according to claim 6 , wherein the cutout portions and the narrow cutout portions are alternately arranged at end portions of the fins. The opening end of the notch is larger than the closed end, the fin collars rising from the two linear edges of the notch are different shapes, and one of the edges is the main of the flat tube The heat exchanger according to claim 1 , wherein the heat exchanger is located on a line parallel to a plane, and the other of the edge portions is located on a line connecting the opening end and the closing end. The opening end of the notch is larger than the closed end, the fin collars rising from the two linear edges of the notch are different in shape, and one of the edges is from the closed end to the above-mentioned closed end. located on a line connecting the position and the open end that is offset in the direction of the cutout portion is widened, the other of said edges, according to claim 1, characterized in that located on the line connecting the opening end and the closed end Heat exchanger.

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