Heat exchanger, fin manufacturing apparatus, fin manufacturing method, fin stack apparatus, and fin stack method

Abstract

To provide a heat exchanger comprising fins having high productivity by restraining stack pins from falling under the own weight of the fins.SOLUTION: A heat exchanger according to the present disclosure comprises a plurality of tubes 12 comprising refrigerant passages, and a plurality of thermally conductive fins 11 stacked and fitted to the tubes 12. The plurality of fins 11 each comprise: a plurality of opening parts 21 formed in the longitudinal direction of the fins 11, and penetrated by the plurality of tubes 12 at predetermined intervals respectively; and notch parts 13 formed along both side surfaces in the longitudinal direction in outer peripheries of the fins 11.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a heat exchanger, a fin manufacturing apparatus, a fin manufacturing method, a fin stack apparatus, and a fin stack method. [Background technology]

[0002] Fins used in conventional heat exchangers are stacked by passing stack pins through openings into which tubes having refrigerant passages are attached (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-164741 Summary of the Invention [Problem to be solved by the invention]

[0004] However, because the fins used in heat exchangers are stacked by inserting stack pins into the openings where the tubes are attached, the diameter of the stack pins depends on the diameter of the tubes. Furthermore, in recent years, there has been a demand for heat exchangers that use less refrigerant to reduce environmental impact, leading to a trend toward smaller diameters for the tubes through which the refrigerant flows. Reducing the tube diameter also reduces the diameter of the stack pins, which reduces the rigidity of the stack pins and causes them to tip over under the weight of the fins. As described above, if the stack pins tip over under the weight of the fins, there is a problem of reduced productivity in fin production.

[0005] The present disclosure has been made to solve the above problems, and aims to provide a heat exchanger with fins that is highly productive by preventing the stack pins from falling over due to the weight of the fins themselves. [Means for solving the problem]

[0006] The heat exchanger of the present disclosure comprises a plurality of tubes, each having a refrigerant passage, and a plurality of thermally conductive fins stacked and attached to the plurality of tubes, each fin being aligned in the longitudinal direction of the fin and comprising a plurality of openings for passing the tubes therethrough, a notch formed on each of both side surfaces extending in the longitudinal direction of the fin at the outer periphery of the fin, and a notch bevel formed on the edge of each notch and rising in the thickness direction of the fin. In each fin, the notch formed on one of the side surfaces and the notch formed on the other side surface are arranged so as not to face each other in the width direction of the fin, which is perpendicular to the longitudinal direction of the fin and the thickness direction of the fin. The cutout portion includes a curved shape. [Effects of the Invention]

[0007] According to the present disclosure, by preventing the stack pins from falling due to the weight of the fins, it is possible to provide a heat exchanger having fins with high productivity. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a partial perspective view showing a heat exchanger according to a first embodiment of the present disclosure. [Figure 2] 1 is a partial perspective view showing a fin stack device according to a first embodiment of the present disclosure. [Figure 3] 1 is a plan view showing a fin stack device according to a first embodiment of the present disclosure. [Figure 4] 1A and 1B are a partial plan view and a cross-sectional view showing a cut-and-raised portion according to a first embodiment of the present disclosure. [Figure 5] 1 is a schematic diagram showing a fin manufacturing apparatus according to a first embodiment of the present disclosure. [Figure 6] FIG. 10 is a plan view showing a fin stack device according to a second embodiment of the present disclosure. [Figure 7]FIG. 11 is a plan view showing a fin stack device according to a third embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0009] Embodiment 1 The configuration of the heat exchanger according to the first embodiment of the present disclosure will be described. Note that the same reference numerals are used in the drawings to designate the same or corresponding components.

[0010] Fig. 1 is a partial perspective view showing a heat exchanger according to a first embodiment of the present disclosure. As shown in Fig. 1, the heat exchanger includes a plurality of thermally conductive plate-like fins 11 stacked at predetermined intervals, a plurality of tubes 12 arranged at predetermined intervals along the longitudinal direction of each fin 11 and having refrigerant passages penetrating through the thickness of each fin 11, and a plurality of first cutouts (cutouts) 13 formed on the outer periphery of each fin 11 along both longitudinal side surfaces of each tube 12. The first cutouts 13 are used to position each fin 11 when stacking the fins 11, and have a semicircular shape that includes a curved shape.

[0011] The fins 11 are made of a metal plate material with high thermal conductivity, such as aluminum (Al) or an aluminum alloy, and have a thickness of 0.09 mm to 0.12 mm, a fin width of 10 mm to 25 mm, and a tensile strength of 100 N / mm. 2 The plate-shaped metal is formed with openings (described later) and first cutouts 13 for passing through the plurality of tubes 12 by a press machine, and then cut into strips to form the fins 11.

[0012] The tubes 12 are made of a metal plate with high thermal conductivity, such as copper (Cu) or a copper alloy, and have a diameter of, for example, 6.8 mm to 7.2 mm. The multiple tubes 12 are attached to the stacked fins 11 by passing through openings (described later) of the stacked fins 11.

[0013] FIG. 2 is a partial perspective view showing a fin stack device according to the first embodiment of the present disclosure. FIG. 3 is a plan view showing the fin stack device according to the first embodiment of the present disclosure. As shown in FIGS. 2 and 3, the fin stack device is provided with a plurality of first stack pins 22, which are rod-shaped stack pins with needle-shaped tips. The plurality of first stack pins 22 are installed vertically upward on the fin stack device. The first fin 11, which is transported from the press device and dropped vertically, contacts and penetrates the plurality of first stack pins 22 on its outer periphery, and lands on a base plate (not shown). Subsequently, the second and subsequent fins 11, which are transported from the press device and dropped vertically, contact and penetrate the plurality of first stack pins 22 on its outer periphery, and fall and land, and are stacked sequentially on top of the fin 11 directly below. This series of steps is called a fin stack. When the fins 11 are stacked on the fin stack device, the multiple first stack pins 22 contact and guide the first cutouts 13, which are multiple cutouts formed on the outer periphery of each fin 11, around the openings 21 of the fins 11. By forming multiple first cutouts 13 on the outer periphery of the fins 11, the first stack pins 22 can guide the fins 11 while maintaining their balance.

[0014] The first stack pin 22 has a cylindrical lower portion fixed to the fin stack device and a sharp cylindrical upper tip portion. By making the tip portion of the first stack pin 22 have a sharp cylindrical shape, when the fin 11 is transported from the press device and dropped vertically, the tip portion of the first stack pin 22 has a shape that guides the first cutout portion 13 of the fin 11, so the fin stack device can stack the fin 11 in the desired position.

[0015] The number of fins 11 stacked in the fin stack device varies depending on the model of the heat exchanger, so it is desirable that the first stack pin 22 has a length that can accommodate the model with the largest number of stacked fins 11. Furthermore, since the rigidity of the first stack pin 22 decreases as it becomes longer, it is desirable to select one with an appropriate thickness depending on the length.

[0016] The diameter of the first stack pin 22 and the diameter of the first cutout portion 13 formed on the outer periphery of the fin 11 will now be described. It is desirable to provide a clearance between the diameter of the first stack pin 22 and the diameter of the first cutout portion 13. Therefore, for example, if the diameter of the first stack pin 22 is 6.0 mm, and a clearance of 0.1 mm is provided between the diameter of the first stack pin 22 and the diameter of the first cutout portion 13, the diameter of the first cutout portion 13 will be 6.2 mm.

[0017] In conventional fin stack devices, first stack pins 22 are inserted into openings 21 in the fins 11 to stack the fins 11. Therefore, the diameter of the first stack pins 22 must be smaller than the diameter of the tubes 12. For example, if the diameter of the tubes 12 is 7.0 mm, providing a clearance of 0.1 mm between the diameter of the first stack pins 22 and the diameter of the tubes 12 results in a diameter of 6.8 mm. However, the diameters of commonly available round bars used for the first stack pins 22 are 5.5 mm, 6.0 mm, 7.0 mm, 8.0 mm, etc., and custom manufacturing a first stack pin 22 with a diameter of 6.8 mm would be more expensive than using a commonly available round bar. Furthermore, changing the diameter of the tubes 12 to use commonly available round bars for the first stack pins 22 would change the amount of refrigerant used through the tubes 12, necessitating a redesign of the tubes 12 and the associated costs of manufacturing new tubes 12.

[0018] In the fin stack device of the present disclosure, the first stack pins 22 are inserted into the first cutout portions 13 of the fins 11 to stack the fins 11, so the diameter of the first stack pins 22 can be changed regardless of the diameter of the tubes 12. Since the rigidity of the first stack pins 22 increases as the diameter of the first stack pins 22 increases, when stacking the fins 11 in the fin stack device, the first stack pins 22 are less likely to tip over if the diameter of the first stack pins 22 is larger than the diameter of the openings 21. In other words, making the diameter of the first cutout portions 13 larger than the diameter of the openings 21 can prevent the first stack pins 22 from tipping over. Furthermore, by inserting the first stack pins 22 into the first cutout portions 13 of the fins 11, the diameter of the tubes 12 can be made smaller than the diameter of the openings 21, thereby reducing the amount of refrigerant used that flows through the tubes 12. When stacking the fins 11 in the fin stack device in a number sufficient to prevent the first stack pin 22 from falling over, the diameter of the first cutout portion 13 may be smaller than the diameter of the opening 21 .

[0019] 4 is a partial plan view and a cross-sectional view showing the cut-and-raised structure according to the first embodiment of the present disclosure. In Fig. 4, the top view is a partial plan view of the fin stack device, and the bottom view is a cross-sectional view taken along line AA in the top view.

[0020] As shown in Fig. 4, the fin 11 has a plurality of openings 21 through which a plurality of tubes pass at predetermined intervals, and a plurality of first cutouts 13 on the outer periphery of the fin 11 through which first stack pins 22 come into contact. Opening cutouts 23 are formed around the plurality of openings 21, and the tubes pass through the openings while contacting the opening cutouts 23. Furthermore, first cutout cutouts 24 are formed around the plurality of first cutouts 13, and the first stack pins 22 pass through the fins while contacting the first cutout cutouts 24. Forming the first cutout cutouts 24 around the first cutouts 13 increases the rigidity of the fin 11, thereby preventing deformation due to collision with the first stack pins 22 when the fin 11 is transported from a press device and dropped vertically. The spacing between each fin 11 stacked vertically can be set by the length of the cut-out 23 of the opening in the longitudinal direction of the tube or the length of the cut-out 24 of the first notch in the longitudinal direction of the first stack pin 22.

[0021] Next, a manufacturing apparatus and method for manufacturing the fin 11 having such a configuration will be described. Figure 5 is a schematic diagram showing a fin manufacturing apparatus according to the first embodiment of the present disclosure.

[0022] As shown in Figure 5, the fin manufacturing apparatus includes an uncoiler 41 that supplies metal plate material 42 with high thermal conductivity, a press device (first cutting section) 43 that processes the plate material 42 to form a strip, a cut-off device (second cutting section) 47 that cuts the strip to a fixed length to form fins 11, and a fin stack device 50 that stacks and holds the cut fins 11.

[0023] The plate material 42 to be processed is a long, thin metal plate formed to a predetermined width. As shown in Fig. 5, one end of the coiled plate material 42 is wound around an uncoiler 41 having a freely rotating shaft, and the plate material 42 is supplied to a press device 43 as the uncoiler 41 rotates.

[0024] The uncoiler 41 intermittently feeds the plate material 42 to the press device 43 in synchronization with the operation of the press device 43. More specifically, the press device 43 has a moving body that grips the top and bottom surfaces of the plate material 42, and the moving body repeats gripping, feeding movement, release, and returning movement in synchronization with the operation of the press device 43, thereby intermittently feeding the plate material 42 into the press device 43.

[0025] The press device 43 processes the plate material 42 while intermittently feeding the plate material 42 to form a strip (not shown). The press device 43 performs multiple press processes using multiple dies to press the plate material 42. These multiple press processes consist of a process of forming the opening 21 in the fin 11 and the surrounding opening cut-and-raised portion 23, and a process of forming the first cut-and-raised portion 13 in the fin 11 and the surrounding first cut-and-raised portion 24.

[0026] In the process of forming the openings 21 in the fins 11 and the surrounding opening cut-ups 23, a plurality of circular openings 21 for passing the tubes 12 through are formed in the plate material 42 in the first press step. In the next press step, the periphery of each opening 21 is cut up to form the opening cut-ups 23. In the process of forming the first cutouts 13 in the fins 11 and the surrounding first cutout cut-ups 24, a plurality of circular cutouts for passing the first stack pins 22 through are formed in the plate material 42 in the first press step. In the next press step, the periphery of each circular cutout is cut up to form the first cutout cut-ups 24. The first cutout cut-ups 24 are formed by burring, which involves passing a conical die through the circular cutouts to expand the periphery of the circular cutouts and stretch them into a cylindrical shape. Note that the individual processes may be performed in parallel or in reverse order.

[0027] Although not shown here, the press device 43 includes an inter-row cutting process in which the plate material 42 is cut into strips along the longitudinal direction using a die. This process forms a strip-shaped body having a width corresponding to one fin 11 in the short direction. In this process, each circular shape formed on the strip is cut to separate it into semicircular first cutouts 13, but each opening 21 is not cut. Therefore, the semicircularly divided first cutouts 13 become circular when adjacent rows of fins 11 are aligned along the longitudinal direction of the fins. In other words, when the fins 11 are stacked in the fin stack device 50 (described later), the semicircular first cutouts 13 formed on the outer periphery of each fin 11 and used to position the fins 11 are punched out as holes penetrating between the rows of each fin 11 so as to equally divide each fin 11 in the row direction.

[0028] The semicircular first cutouts 13 are formed not facing each other along both side surfaces in the longitudinal direction, which is the width direction, of the fin 11. This makes it possible to suppress a decrease in the overall rigidity of the fin 11, which would be caused by the formation of narrow portions of the fin 11 along both side surfaces in the longitudinal direction, which is the width direction of the fin 11.

[0029] The conveying roller 44 is configured by attaching a coupling (not shown) to the output shaft of a servo motor (not shown), and is operated and stopped according to commands from an external controller. The conveying roller 44 conveys the pressed strip from the press device 43 to the cut-off device 47. The conveying roller 44 is equipped with conveying pins 45, which are inserted into, for example, the opening 21 or the first cutout 13 of the strip to convey the strip.

[0030] The suction conveying section 46 has a number of suction holes on the surface along which the strip is conveyed, and uses a vacuum generator to suction the strip, conveying the strip the length of the product using conveying rollers 44. The cut-off device 47 then cuts the strip to the length of the product, i.e., the length of the fins 11, to form the fins 11. Once cutting by the cut-off device 47 is complete, the vacuum generator is stopped and air is discharged from the suction holes, causing the fins 11 to be detached from the suction conveying section 46 to the fin stack device 50.

[0031] After the fin 11 is released, a new strip is sent from the press device 43 to the suction conveying section 46 by the conveying rollers 44, and the fin suction conveying section 46 again sucks air from the suction holes by the vacuum generator, preparing to convey the new strip.

[0032] The cutoff device 47 is composed of an upper blade 48 and a lower blade 49. The cutoff device 47 is a so-called scissors-like mechanism that shears and breaks the material to be cut using a clearance and shear angle set to 10% or less of the thickness of the material, and has two long blades arranged on the top and bottom along the width direction of the fin 11. The cutoff device 47 cuts the strip to a predetermined length by lowering the upper blade 48 toward the lower blade 49 to form the fin 11, and then returns to its standby position by raising the upper blade 48 from the lower blade 49.

[0033] The timing for cutting the strip by the cutoff device 47 is when the strip reaches the length of the product. Therefore, while the press device 43 is processing the plate material 42, that is, while the plate material 42 is stopped, it is desirable to complete cutting of the strip by the cutoff device 47 and removal from the suction conveying section 46 earlier than the start of conveyance of the next plate material 42.

[0034] The fin stack device 50 has the function of stacking the fins 11. The fin stack device 50 stacks the fins 11 cut to a predetermined length by the cutoff device 47 onto the first stack pins 22. In detail, the fin stack device 50 includes a base plate 51 on which the fins 11 are stacked, and a plurality of first stack pins 22 that penetrate the base plate 51, and the first stack pins 22 come into contact with first cutout portions 13 formed on the outer periphery of the fins 11 when stacking the fins 11.

[0035] When the fins 11 are stacked on the fin stack device 50, the first stack pins 22 come into contact with a part of the semicircular first cutout portions 13, which include a curved cross section, formed on each fin 11 as the fins 11 drop toward the base plate 51, thereby adjusting the drop position. The semicircular first cutout portions 13, which include a curved cross section, can prevent scratches from occurring when the first stack pins 22 come into contact with the fins 11. Furthermore, the raised portions 24 of the first cutout portions increase the rigidity of the semicircular first cutout portions 13, thereby preventing deformation when the first stack pins 22 come into contact with the fins 11.

[0036] Next, a method for manufacturing the fins 11 performed by the fin manufacturing apparatus having the above configuration will be described with reference to FIG.

[0037] One end of a long plate material 42 is wound around an uncoiler 41 in a coil shape, and as the uncoiler 41 rotates, the plate material is pulled out from the uncoiler 41 and intermittently fed into a press device 43 .

[0038] The press device 43 performs a pressing operation using a die in synchronization with the intermittent feeding operation of the plate material 42. The press device 43 forms a plurality of openings 21 and a plurality of surrounding cut-and-raised portions 23 for the openings, and a plurality of first cutout portions 13 and a plurality of surrounding cut-and-raised portions 24 for the first cutout portions, each time the plate material 42 is fed by one pitch. The press device 43 performs a plurality of pressing steps using a plurality of dies to die-press the plate material 42. These pressing steps are composed of a step of forming the openings 21 in the fin 11 and a plurality of surrounding cut-and-raised portions 23 for the openings, and a step of forming the first cutout portions 13 in the fin 11 and a plurality of surrounding cut-and-raised portions 24 for the first cutout portions.

[0039] In the process of forming the openings 21 in the fins 11 and the surrounding opening cut-ups 23, a plurality of round openings 21 for passing the tubes 12 through are formed in the plate material 42 in the first press step. In the next press step, the periphery of each opening 21 is cut up to form the opening cut-ups 23. In the process of forming the first cut-out portions 13 in the fins 11 and the surrounding first cut-out cut-ups 24, a plurality of round first cut-out portions 13 for passing the first stack pins 22 through are formed in the plate material 42 in the first press step. In the next press step, the periphery of each first cut-out portion 13 is cut up to form the first cut-out cut-ups 24.

[0040] The conveying pins 45 of the conveying rollers 44 convey the fins 11 of the strip a predetermined length, i.e., the product length, by inserting the conveying pins 45 into the openings 21 or the first cutouts 13 of the strip.

[0041] The cut-off device 47 cuts the strip to a predetermined length to form the fins 11 .

[0042] The fin stack device 50 stacks the fins 11 cut to a predetermined length by the cutoff device 47 onto the first stack pins 22. The first stack pins 22 are in contact with the first cutout portions 13 formed on the outer periphery of the fins 11. By repeating the above steps, the fin stack device 50 can stack a specific number of fins 11.

[0043] Through such manufacturing steps carried out by the fin manufacturing apparatus, the fins 11 are manufactured from the long metal plate material 42.

[0044] As described above, according to the first embodiment of the present disclosure, the heat exchanger comprises a plurality of tubes 12 each having a refrigerant passage, and a plurality of thermally conductive fins 11 stacked and attached to the tubes 12, each of the plurality of fins 11 having a plurality of openings 21 formed in the longitudinal direction of the fin 11 and allowing each of the plurality of tubes 12 to pass therethrough at predetermined intervals, and a first cutout portion 13 formed along both longitudinal side surfaces on the outer periphery of the fin 11.

[0045] The heat exchanger of the present disclosure is provided with the first cutout portion 13, which prevents the first stack pin 22 from falling over due to the weight of the fin 11, thereby providing a heat exchanger with fins that is highly productive.

[0046] Furthermore, according to the first embodiment of the present disclosure, a fin manufacturing apparatus for manufacturing fins 11 to be attached to tubes 12 having refrigerant passages includes a press device 43 that forms a plurality of openings 21 in the longitudinal direction of a thermally conductive plate material 42 at predetermined intervals to allow a plurality of tubes 12 to pass therethrough, and forms a first cutout portion 13 on the outer periphery of the plate material 42 to allow contact with a first stack pin 22, and forms a strip-shaped body; and a cut-off device 47 that cuts the strip to a predetermined length to form the fins 11.

[0047] The fin manufacturing apparatus of the present disclosure processes the fin 11 to form the first cutout portion 13, thereby preventing the first stack pin 22 from falling over due to the weight of the fin 11, and making it possible to provide a heat exchanger with fins that is highly productive.

[0048] Furthermore, according to the first embodiment of the present disclosure, there is provided a fin manufacturing method for manufacturing fins 11 to be attached to tubes 12 having refrigerant passages, the method comprising: forming a plurality of openings 21 in the longitudinal direction of a thermally conductive plate material 42 at predetermined intervals to allow a plurality of tubes 12 to pass therethrough; forming a first cutout portion 13 on the outer periphery of the plate material 42 to allow contact with a first stack pin 22; and a first cutting process for forming a strip; and cutting the strip to a predetermined length to form the fins 11.

[0049] The fin manufacturing method of the present disclosure includes a first cutting process for processing the fin 11 to form a first cutout portion 13, thereby preventing the first stack pin 22 from falling over due to the weight of the fin 11, and providing a highly productive fin manufacturing method.

[0050] Furthermore, according to the first embodiment of the present disclosure, the fin stack device 50 comprises a base plate 51 on which the fins 11 are stacked, and a plurality of rod-shaped first stack pins 22 provided on the base plate 51, and the first stack pins 22 contact first cutout portions 13 formed on the outer periphery of the fins 11 around a plurality of openings 21 formed inside the fins 11 and through which a plurality of tubes 12 having refrigerant passages pass.

[0051] The fin stack device 50 of the present disclosure prevents the first stack pin 22 from falling over due to the weight of the fin 11 by contacting the first stack pin 22 with the first cutout portion 13, thereby making it possible to provide a heat exchanger with fins that is highly productive.

[0052] Furthermore, according to the first embodiment of the present disclosure, the fin stack method includes a contacting step of contacting a plurality of first stack pins 22 provided on a base plate 51 with first cutout portions 13 formed on the outer periphery of the fins 11 around an opening 21 through which a tube 12 having a refrigerant passage passes, and a stacking step of stacking the fins 11 on the base plate 51.

[0053] The fin stacking method of the present disclosure includes a contact process in which the first stack pin 22 is brought into contact with the first cutout portion 13, thereby preventing the first stack pin 22 from falling over due to the weight of the fin 11, and providing a highly productive fin stacking method.

[0054] (Modification of the first embodiment) The fin 11 does not need to have the first cutout bend 24 formed around the first cutout 13. By not forming the first cutout bend 24, the area of ​​contact between the fin 11 and the first stack pin 22 is reduced when the fin 11 drops from the suction / transport unit 46 toward the base plate 51, thereby reducing friction with the first stack pin 22. Furthermore, in the press process for forming the first cutout bend 24, a conical die is passed through the first cutout 13, thereby eliminating the need for burring, which expands the periphery of the first cutout 13 and stretches it into a cylindrical shape. This reduces the cost of manufacturing a heat exchanger having the fin 11.

[0055] Embodiment 2 The configuration of the heat exchanger according to the second embodiment of the present disclosure will be described. Fig. 6 is a plan view showing a fin stack device according to the second embodiment of the present disclosure. Other configurations of the heat exchanger according to the second embodiment of the present disclosure are the same as those of the heat exchanger according to the first embodiment of the present disclosure.

[0056] 6, second cutouts 32, which are cutouts formed in the longitudinal direction of the tubes, are formed on the outer peripheries of the fins 11. The second cutouts 32 are used to position each fin 11 when stacking the fins 11, and are triangular in shape with some linear features.

[0057] The second stack pin 31, which is a stack pin, has a rectangular prism-shaped lower portion fixed to the fin stack device 50 and a sharp rectangular prism-shaped upper tip portion. By making the tip portion of the second stack pin 31 a sharp rectangular prism-shaped portion, when the fin 11 is transported from the press device 43 and dropped vertically, the tip portion of the second stack pin 31 has a shape that guides the second cutout portion 32 of the fin 11, so that the fin stack device 50 can stack the fin 11 in the desired position.

[0058] Around the second cutout portions 32, raised portions 25 of the second cutout portions are formed, and the second stack pins 31 are passed through while contacting the raised portions 25 of the second cutout portions. The formation of the raised portions 25 of the second cutout portions around the second cutout portions 32 increases the rigidity of the fins 11, and therefore, when the fins 11 drop from the suction and transport section 46 toward the base plate 51, deformation due to collision with the second stack pins 31 can be prevented.

[0059] As described above, according to the second embodiment of the present disclosure, fin 11 includes second cutout portion 32 in a triangular shape including a linear shape on the outer periphery of fin 11.

[0060] The fin 11 has a second cutout portion 32 that is triangular in shape and includes a linear shape, which increases the surface area compared to when a semicircular cutout portion is formed, thereby providing a heat exchanger having fins with high heat exchange efficiency.

[0061] Embodiment 3 A configuration of a heat exchanger according to the third embodiment of the present disclosure will be described below. Fig. 7 is a plan view showing a fin stack device according to the third embodiment of the present disclosure.

[0062] The third embodiment of the present disclosure differs from the first embodiment of the present disclosure in the configuration of the cutouts formed in the fins 11 and the positions of the cutouts around the cutouts. The other configurations of the heat exchanger of the second embodiment of the present disclosure are the same as the configurations of the heat exchanger of the first embodiment of the present disclosure.

[0063] 7, the semicircular first cutouts 13 are formed opposite each other along both side surfaces in the longitudinal direction, which is the width direction, of the fin 11. When the aluminum or aluminum alloy from which the fin 11 is made is preliminarily subjected to a heat treatment or other treatment to improve rigidity, forming the semicircular first cutouts 13 opposite each other along both side surfaces in the longitudinal direction, which is the width direction, of the fin 11 allows the fin 11 to have a simple shape, and a heat exchanger having fins that can be easily produced can be provided.

[0064] Within the scope of the disclosure, the first, second, and third embodiments of the present disclosure can be freely combined, and each embodiment can be modified or omitted as appropriate. [Explanation of symbols]

[0065] 11 fin, 12 tube, 13 first cutout portion (cutout portion), 21 opening, 22 first stack pin (stack pin), 23 opening cutout, 24 first cutout portion cutout, 25 second cutout portion cutout, 31 second stack pin (stack pin), 32 second cutout portion (cutout portion), 41 uncoiler, 42 plate material, 43 press device (first cutting portion), 44 conveying roller, 45 conveying pin, 46 suction conveying portion, 47 cut-off device (second cutting portion), 48 upper blade, 49 lower blade, 50 fin stack device, 51 base plate.

Claims

1. a plurality of tubes each having a refrigerant passage; a plurality of thermally conductive fins attached to the plurality of tubes in a stacked manner; Equipped with Each of the fins is a plurality of openings arranged in a longitudinal direction of the fin, each of which allows the tube to pass through; a notch formed on each of both side surfaces of the fin extending in the longitudinal direction at the outer periphery of the fin; a cutout portion bevel formed on an edge of each of the cutout portions and rising in a thickness direction of the fin; A heat exchanger comprising: In each of the fins, the notch formed on one of the side surfaces and the notch formed on the other of the side surfaces are arranged so as not to face each other in a width direction of the fin perpendicular to the longitudinal direction of the fin and the thickness direction of the fin, The cutout portion includes a curved shape. heat exchanger.

2. a plurality of tubes each having a refrigerant passage; a plurality of thermally conductive fins attached to the plurality of tubes in a stacked manner; Equipped with Each of the fins is a plurality of openings arranged in a longitudinal direction of the fin, each of which allows the tube to pass through; a notch formed on each of both side surfaces of the fin extending in the longitudinal direction at the outer periphery of the fin; a cutout portion bevel formed on an edge of each of the cutout portions and rising in a thickness direction of the fin; A heat exchanger comprising: In each of the fins, the notch formed on one of the side surfaces and the notch formed on the other of the side surfaces are arranged so as not to face each other in a width direction of the fin perpendicular to the longitudinal direction of the fin and the thickness direction of the fin, The cutout portion is formed in a semicircular shape, The diameter of the cutout portion is larger than the diameter of the tube. heat exchanger.

3. a plurality of tubes each having a refrigerant passage; a plurality of thermally conductive fins attached to the plurality of tubes in a stacked manner; Equipped with Each of the fins is a plurality of openings arranged in a longitudinal direction of the fin, each of which allows the tube to pass through; a notch formed on each of both side surfaces of the fin extending in the longitudinal direction at the outer periphery of the fin; a cutout portion bevel formed on an edge of each of the cutout portions and rising in a thickness direction of the fin; A heat exchanger comprising: In each of the fins, the notch formed on one of the side surfaces and the notch formed on the other of the side surfaces are arranged so as not to face each other in a width direction of the fin perpendicular to the longitudinal direction of the fin and the thickness direction of the fin, In each of the fins, the notch formed on one of the side surfaces and the notch formed on the other side surface are arranged so as not to face the opening in the width direction of the fin. heat exchanger.

4. a plurality of tubes each having a refrigerant passage; a plurality of thermally conductive fins attached to the plurality of tubes in a stacked manner; Equipped with Each of the fins is a plurality of openings arranged in a longitudinal direction of the fin, each of which allows the tube to pass through; a notch formed on each of both side surfaces of the fin extending in the longitudinal direction at the outer periphery of the fin; a cutout portion bevel formed on an edge of each of the cutout portions and rising in a thickness direction of the fin; A heat exchanger comprising: In each of the fins, the notch formed on one of the side surfaces and the notch formed on the other of the side surfaces are arranged so as not to face each other in a width direction of the fin perpendicular to the longitudinal direction of the fin and the thickness direction of the fin, In each of the fins, an opening cut-out portion is formed on an edge of each of the openings, the cut-out portion rising in the thickness direction of the fin, a dimension of the cutout portion cut-out in the thickness direction of the fin is smaller than a dimension of the opening portion cut-out in the thickness direction of the fin; heat exchanger.

5. A fin manufacturing apparatus for manufacturing fins to be attached to a plurality of tubes each having a refrigerant passage, a press unit that presses a thermally conductive plate material to form a band-shaped body having a line of openings through which the tubes pass, the band-shaped body having cutouts on the outer periphery for contacting the stack pins and having raised notches for the cutouts at the edges of the cutouts; a cutting unit that cuts the strip into a length that includes the plurality of openings to obtain the fin; Equipped with a pair of the cutout portion and the cut-out portion cut-out bend is arranged on each of both side surfaces of the fin obtained by cutting the cutout portion, the pair extending in a longitudinal direction parallel to the direction in which the plurality of openings are arranged; The notch formed on one of the side surfaces and the notch formed on the other of the side surfaces are arranged so as not to face each other in a width direction of the fin perpendicular to the longitudinal direction of the fin. Fin manufacturing equipment.

6. A fin manufacturing method for manufacturing fins to be attached to a plurality of tubes each having a refrigerant passage, comprising the steps of: a pressing step of pressing a thermally conductive plate material to form a band-shaped body having a row of openings for passing the tubes therethrough, the band-shaped body having cutouts on the outer periphery for contacting the stack pins, and having raised notches for the cutouts at the edges of the cutouts; a cutting step of cutting the strip to a length including the plurality of openings to obtain the fins; Equipped with a pair of the cutout portion and the cut-out portion cut-out bend is disposed on each of both side surfaces of the fin obtained by cutting in the cutting step, the pair extending in a longitudinal direction parallel to a direction in which the plurality of openings are arranged; The notch formed on one of the side surfaces and the notch formed on the other of the side surfaces are arranged so as not to face each other in a width direction of the fin perpendicular to the longitudinal direction of the fin. Fin manufacturing method.

7. a base plate on which fins are stacked, the fins being attached to a plurality of tubes each having a refrigerant passage; a plurality of rod-shaped stack pins provided on the base plate and extending in a direction in which the fins are stacked; Equipped with Each of the fins stacked on the base plate is a plurality of openings arranged in a longitudinal direction of the fin, each of which allows the tube to pass through; a first side surface cutout portion formed on one of both side surfaces of the fin extending in the longitudinal direction at the outer periphery of the fin; a second side surface cutout formed on the other of the two side surfaces in the outer periphery of the fin, the second side surface cutout being arranged so as not to face the first side surface cutout in a width direction of the fin perpendicular to the longitudinal direction of the fin; and The plurality of stack pins include: first side surface stack pins that come into contact with the first side surface cutout portions of the plurality of fins stacked on the base plate; the first side surface stack pins are second side surface stack pins that are arranged so as not to face each other in the width direction of the fins, and that come into contact with the second side surface cutout portions of the plurality of fins stacked on the base plate; Contains, Fin stack device.

8. a base plate on which fins are stacked, the fins being attached to a plurality of tubes each having a refrigerant passage; a plurality of rod-shaped stack pins provided on the base plate and extending in a direction in which the fins are stacked; Using Each of the fins stacked on the base plate is a plurality of openings arranged in a longitudinal direction of the fin, each of which allows the tube to pass through; a first side surface cutout portion formed on one of both side surfaces of the fin extending in the longitudinal direction at the outer periphery of the fin; a second side surface cutout formed on the other of the two side surfaces in the outer periphery of the fin, the second side surface cutout being arranged so as not to face the first side surface cutout in a width direction of the fin perpendicular to the longitudinal direction of the fin; and The plurality of stack pins include: a first side stack pin; the first side surface stack pin and a second side surface stack pin arranged so as not to face each other in the width direction of the fin; A fin stack method comprising: bringing the first side surface stack pin into contact with the first side surface cutout portion of the fin and bringing the second side surface stack pin into contact with the second side surface cutout portion of the fin, and moving the fin along the first side surface stack pin and the second side surface stack pin toward the base plate, thereby stacking the fin on the base plate. Fin stacking method.

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