JP2013139042A - Method of manufacturing corrugated fin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing corrugated fins, which enables formation of a water guiding part on a fin material.SOLUTION: The method of manufacturing the corrugated fins includes a first step S1 and a second step S2. In the first step, a first notch 251 is formed at the end ER in the width direction of a fin material 20a. The end in the width direction of the fin material guides condensed water which is stuck to the surface of the fin material. In the second step, the center part CR in the width direction of the fin material, being a portion except for the end, is held between gear-shaped rollers 41, 42 and the center part is bent in the longitudinal direction of the fin material.

Description

  The present invention relates to a method for manufacturing a corrugated fin.

  Conventionally, it has been proposed to use a corrugated fin as shown in, for example, Patent Document 1 (Japanese Patent Laid-Open No. 2010-2138) as a heat exchanger of an air conditioner. The corrugated fin is preferably subjected to various processing (for example, louver processing, bending processing, etc.) in order to improve the performance of the heat exchanger.

  By the way, in the said patent document 1, the corrugated fin which has a water guide part is proposed. The water guide part has a function of inducing condensed water adhering to the surface of the corrugated fins and improving water drainage performance. A water guide part is a part which protrudes from the main-body part of the fin material which functions as a heat-transfer part. Since the water guide portion is a minute area portion formed by using the end portion in the width direction of the fin material, the shape of the water guide portion may collapse in the process of forming the water guide portion.

  The subject of this invention is providing the manufacturing method of the corrugated fin which makes it possible to form a water guide part in a fin material accurately.

  The manufacturing method of the corrugated fin according to the first aspect of the present invention includes a first step and a second step. In the first step, a first cut is formed at the end in the width direction of the fin material. The end in the width direction of the fin material induces condensed water adhering to the surface of the fin material. In the second step, the central portion in the width direction of the fin material, excluding the end portion, is sandwiched between gear-shaped rollers, and the central portion is bent in the length direction of the fin material.

  In the manufacturing method of the corrugated fin according to the first aspect of the present invention, after the first notch is formed at the end portion in the width direction of the fin material, the portion excluding the end portion is sandwiched between the gear-shaped rollers, and the fin material is long. It can be bent in the vertical direction. Thereby, a part of fin material can be raised with respect to another plane with few processes.

  The manufacturing method of the corrugated fin according to the second aspect of the present invention is the manufacturing method of the corrugated fin according to the first aspect, and in the second step, by bending the central portion of the fin material in the length direction of the fin material. The heat transfer part for performing heat exchange with air is formed in the center part of the fin material. Moreover, the water guide part which protrudes from a heat-transfer part at the edge part of a fin material, and induces condensed water is formed.

  In the manufacturing method of the corrugated fin according to the second aspect of the present invention, the heat transfer portion at the center portion of the fin material and the water guide portion at the end portion of the fin material are formed by bending the center portion of the fin material in the length direction. Each is formed. Since the end of the fin material is not processed after the cut is formed, the surface of the water guide portion can be kept flat.

  The manufacturing method of the corrugated fin according to the third aspect of the present invention is a manufacturing method of the corrugated fin according to the first aspect or the second aspect, and in the first step, a cylindrical roller that contacts the end portion from the center portion. Is used to form a first cut at the end of the fin material.

  In the corrugated fin manufacturing method according to the third aspect of the present invention, the first cut is formed at the end of the fin material by the cylindrical roller. Thereby, the manufacturing efficiency of a corrugated fin can be improved.

  The manufacturing method of the corrugated fin according to the fourth aspect of the present invention is the manufacturing method of the corrugated fin according to the second aspect or the third aspect, and in the first step, the width dimension of the leading end of the water guiding portion is that of the water guiding portion. A first cut is formed that is smaller than the width of the root.

  In the manufacturing method of the corrugated fin according to the fourth aspect of the present invention, the first notch is formed at the end of the fin material so that the width of the tip of the water guide is smaller than the width of the root of the water guide. Is done. Thereby, the water draining performance can be improved.

  The manufacturing method of the corrugated fin which concerns on the 5th viewpoint of this invention is a manufacturing method of the corrugated fin which concerns on either of the 1st viewpoint to the 4th viewpoint, Comprising: In a 1st process, it is a 2nd position from a 1st position. Forming a first cut extending in The second position is a position different from the first position along the longitudinal direction of the fin material. Furthermore, in the first step, it is preferable to form a first cut extending from the first position to the second position and further to the third position. The third position is the same height position as the first position or the second position, and is a position that is different in the width direction of the fin material.

  In the corrugated fin manufacturing method according to the fifth aspect of the present invention, a first cut extending from the first position to the second position is formed at the end of the fin material. Thereby, the water draining performance can be improved.

  The manufacturing method of the corrugated fin according to the first aspect of the present invention can raise a part of the fin material with respect to another plane with a small number of steps.

  Since the manufacturing method of the corrugated fin which concerns on the 2nd viewpoint of this invention does not process after an incision is formed in the edge part of a fin material, it can keep the surface of a water conveyance part flat.

  The manufacturing method of the corrugated fin according to the third aspect of the present invention can improve the manufacturing efficiency of the corrugated fin.

  The manufacturing method of the corrugated fin according to the fourth aspect of the present invention can improve the water drainage performance of the corrugated fin.

  The manufacturing method of the corrugated fin according to the fifth aspect of the present invention can improve the water drainage performance of the corrugated fin.

It is an external view of the heat exchanger with which the corrugated fin which concerns on this embodiment is used. It is an enlarged view of the part shown by the area | region A of FIG. It is a figure for demonstrating the process given to a fin material. It is the schematic of the corrugated fin manufacturing apparatus which concerns on this embodiment. It is a figure which shows the example of the cylindrical roller contained in a 1st processing apparatus. It is a figure which shows the example of the gear-shaped roller contained in a 2nd processing apparatus. It is a figure for demonstrating the flow of the manufacturing method of a corrugated fin. It is the schematic of the corrugated fin manufacturing apparatus which concerns on the modification E.

  Hereinafter, the manufacturing method of the corrugated fin according to the present invention will be described in detail with reference to the drawings. The following embodiments are specific examples of the present invention and do not limit the technical scope of the present invention.

(1) Outline First, the heat exchanger 10 in which the corrugated fin 20 according to the present embodiment is used is shown. The corrugated fin 20 is used as a heat transfer fin of the heat exchanger 10 as shown in FIG. The heat exchanger 10 is provided inside the outdoor unit of the air conditioner and functions as an evaporator or a radiator. The heat exchanger 10 includes a flat tube 11 and headers 12 and 13 in addition to the corrugated fins 20. In the heat exchanger 10, the corrugated fins 20 are arranged and used between the stacked flat tubes 11.

  The flat tube 11 is formed from aluminum or an aluminum alloy. As shown in FIG. 2, the flat tube 11 includes a flat portion 11 a serving as a heat transfer surface and a plurality of refrigerant flow paths 11 b through which the refrigerant flows. The flat tube 11 is joined to the headers 12 and 13 in a state where the flat surface portion 11a is directed upward and downward, and is laminated in a plurality of stages in the major axis direction of the headers 12 and 13. The corrugated fin 20 is disposed between the stacked flat tubes 11. In other words, the corrugated fin 20 is disposed in the ventilation space sandwiched between the flat tubes 11 adjacent to each other in the vertical direction. The corrugated fin 20 has a peak portion 21 and a valley portion 22. The peaks 21 and valleys 22 and the flat portion 11a of the flat tube 11 are brazed. The headers 12 and 13 guide the refrigerant to the refrigerant flow path 11b of the flat tube 11 or collect the refrigerant that has come out of the refrigerant flow path 11b. Specifically, as shown in FIG. 1, the refrigerant flowing from the inlet 12 a of the header 12 is distributed almost evenly to the respective refrigerant flow paths 11 b of the uppermost flat tube 11 and flows toward the header 13. The refrigerant reaching the header 13 is evenly distributed to the refrigerant flow paths 11b of the second-stage flat tube 11 and flows toward the header 12. The refrigerant that has flowed through each refrigerant flow path 11b of the lowermost flat tube 11 and reached the header 12 is collected at the header 12 and flows out from the outlet 12b. When the heat exchanger 10 functions as an evaporator, the refrigerant flowing through the refrigerant flow path 11 b absorbs heat from the air flow flowing through the ventilation space via the corrugated fins 20. When the heat exchanger 10 functions as a condenser, the refrigerant flowing through the refrigerant flow path 11b radiates heat to the air flow flowing through the ventilation space via the corrugated fins 20.

  When the corrugated fin 20 according to the present embodiment is used as a heat transfer fin of the heat exchanger 10 as described above, the heat exchange performance is reduced due to the condensed water generated in the heat exchanger 10. The fin material 20a is subjected to various processes so as not to be present. Hereinafter, the configuration of the corrugated fin 20 according to the present embodiment will be described in detail, and then the manufacturing method of the corrugated fin 20 will be described.

(2) Configuration of Corrugated Fin The corrugated fin 20 is formed of a fin material 20a made of aluminum or aluminum alloy (see FIG. 3). The plate thickness dimension of the fin material 20a is about 0.1 mm. The width dimension of the fin material 20a is about 19.0 mm to about 22.0 mm. The width dimension of the fin material 20 a is larger than the width dimension of the flat tube 11. The fin material 20a is fed out from the roll material by an uncoiler described later. As described above, the corrugated fin 20 is manufactured by performing various processes on the fin material 20a (see FIG. 2).

  The corrugated fin 20 mainly has a mountain part 21, a valley part 22, a heat transfer part P1, and a water guide part P2. The crest portion 21 and the trough portion 22 are formed in a contact area (second area) BA of the fin material 20a (see FIG. 3). The contact area BA is an area that comes into contact with the flat tube 11 in the fin material 20a. On the other hand, the heat transfer part P1 and the water conveyance part P2 are formed in the non-contact area | region (1st area | region) NA of the fin material 20a (refer FIG. 3). Non-contact area | region NA is an area | region which does not contact the flat tube 11 among the fin materials 20a. Hereinafter, the configuration of the corrugated fin 20 according to the present embodiment will be described by dividing the configuration formed in the contact area BA of the fin material 20a and the configuration formed in the non-contact area NA.

(2-1) Contact region The contact region BA is a region extending to the center (central region) CR in the width direction of the fin material 20a, and is surrounded by the first width dimension w1 and the first length dimension L1. A rectangular area. In FIG. 3, for example, the first width dimension w1 is about 18 mm, and the first length dimension L1 is about 1.5 mm. The first width dimension w <b> 1 is the same as the width dimension of the flat tube 11.

  By processing the fin material 20a using the corrugated fin manufacturing apparatus 100 described later, the contact area BA of the fin material 20a becomes the peak portion 21 or the valley portion 22. As described above, the peak portion 21 and the valley portion 22 are portions that are brazed to the flat portion 11a of the flat tube 11 (see FIG. 2). The peak portion 21 and the valley portion 22 have a plane that faces the plane portion 11 a of the flat tube 11. The plane of the non-contact area NA has an inclination of about 90 ° with respect to the plane of the peak portion 21 and the valley portion 22. The mountain portion 21 is joined to the flat portion 11a of the flat tube 11 facing downward. Further, the valley portion 22 is joined to the flat portion 11a of the flat tube 11 facing upward.

  In addition, the peak part 21 and the trough part 22 formed in the contact area BA have a symmetrical shape with respect to the lateral center position c1 of the fin material 20a (see FIG. 3).

(2-2) Non-contact area | region Non-contact area | region NA is an area | region adjacent to contact area BA in the longitudinal direction of the fin material 20a. The non-contact area NA extends from one end in the width direction of the fin material 20a to the other end. Specifically, the non-contact area NA is a free area including a central area CR and end areas ER located on both ends in the width direction of the central area CR. More specifically, the width dimension w2 of the non-contact area NA is the same as the width dimension w2 of the fin material 20a. The width dimension w2 of the fin material 12b is, for example, about 19.0 mm to about 22.0 mm.

  By processing the fin material 20a using the corrugated fin manufacturing apparatus 100 described later, the non-contact area NA of the fin material 20a becomes a heat transfer part P1 and a water guide part P2, as shown in FIG. The non-contact area NA also has a symmetrical shape with respect to the center position c1 in the width direction of the fin material 20a (see FIG. 3). In other words, the configurations of the heat transfer part P1 and the water conveyance part P2 have a symmetrical shape with respect to the center position in the width direction of the corrugated fin 20.

(2-2-1) Heat Transfer Part The heat transfer part P1 is a part that mainly exchanges heat with air. Of the non-contact area NA of the fin material 20a, the central area CR becomes the heat transfer part P1 of the corrugated fin 20. The region to be the heat transfer portion P1 is a portion surrounded by the width dimension w1 and the length dimension L2 in FIG. That is, the width dimension w1 of the heat transfer part P1 is the same as the width dimension w1 of the contact area BA. Moreover, the length dimension L2 of the heat transfer part P1 is a dimension from the lower boundary line DL of the upper contact area BA to the upper boundary line DL of the lower contact area BA in the longitudinal direction of the fin material 20a. It is. The heat transfer part P1 has a plane generally along the air flow direction. The heat transfer part P <b> 1 has a louver 23 and a guide hole 24.

(A) Louver The louver 23 has a function of improving the heat exchange efficiency of the heat exchanger 10. The louvers 23 are formed so as to be arranged along the air flow direction. The louver 23 protrudes in the plate thickness direction from the plane of the heat transfer part P1 (see FIG. 2). The louver 23 according to the present embodiment is formed by partially cutting and raising the main body portion of the fin material 20a. Accordingly, an opening penetrating from one side of the plane to the other side is formed in the plane portion of the heat transfer section P1 where the louver 23 is formed. Moreover, the shape of the louver 23 is an elongated rectangle extending in the height direction of the heat transfer part P1. Each louver 23 is disposed at a predetermined distance in the width direction of the corrugated fin 20. Each louver 23 has a shape that inclines so as to incline upstream in the air flow direction.

(B) Guide hole The guide hole 24 is a hole for facilitating the positioning of the fin material 20a when the corrugated fin 20 is manufactured. Specifically, the guide hole 24 processes the fin material 20a at an appropriate position of the fin material 20a when the fin material 20a is conveyed to the devices 30 and 40 included in the corrugated fin manufacturing apparatus 100 and subjected to various processing. Hole used by each device for.

  The guide hole 24 is formed by partially cutting out the main body portion of the fin material 20a. In the present embodiment, the guide hole 24 is formed at the center position c1 in the width direction of the fin material 20a and at the center position h1 in the length direction of the louver 23 (see FIG. 3).

(2-2-2) Water Conveying Unit The water guiding unit P2 is a part that mainly guides condensed water in one direction. Specifically, the water guiding part P2 has a function of guiding the condensed water downward. More specifically, the water conveyance part P2 has a function which receives condensed water from the corrugated fin 20 arrange | positioned at the upper stage, and also delivers condensed water to the corrugated fin 20 arrange | positioned at the lower stage.

  Of the non-contact area NA, the end area ER becomes the water guiding part P2. A plurality of water guiding portions P2 are formed in the longitudinal direction of the fin material 20a by separating the fin material 20a with a projection slit 251 described later as a boundary (see FIG. 3). The region to be the water guiding portion P2 is a portion having the width dimension w3 and the length dimension L3 shown in FIG. Further, the upper and lower ends in the longitudinal direction of the water guiding portion P2 have one side inclined upward or downward. Furthermore, the water guide part P2 has a plane substantially along the air flow direction.

(A) Protrusion part Protrusion part 25a, 25b is a part which protrudes in the orthogonal direction with respect to the plane of the above-mentioned peak part 21 and trough part 22. The protrusions 25a and 25b are provided at both ends in the height direction of the water guide portion P2. In the heat exchanger 10, the protrusions 25a and 25b extend to a position close to or in contact with an end of the corrugated fin 20 disposed in the upper stage and the lower stage. That is, the protrusions 25a and 25b receive the condensed water induced by the protrusions 25a and 25b or the water guide part P2 arranged at the upper stage, and the protrusions 25a and 25b or the water guide part P2 of the corrugated fin 20 arranged at the lower stage. Pass to.

  A protrusion (upward protrusion) 25 a formed on the upper side in the height direction of the water guide portion P <b> 2 protrudes upward in the vertical direction with respect to the plane of the peak portion 21. The width of the upper protrusion 25a varies depending on the height position. That is, the width of the upper protrusion 25a is the widest at the same height position as the plane of the peak portion 21, and becomes narrower as the distance from the plane of the peak portion 21 increases (that is, as the height direction becomes higher). In other words, the upper protrusion 25a has a substantially triangular shape with an acute angle at the tip.

  On the other hand, the protrusion (lower protrusion) 25 b formed on the lower side in the height direction of the water guide portion P <b> 2 protrudes downward in the vertical direction with respect to the plane of the valley portion 22. The width of the lower protrusion 25b also changes depending on the height position. That is, the width of the lower protrusion 25b is the widest at the same height position as the plane of the valley 22 and becomes narrower as the distance from the plane of the valley 22 decreases (that is, as the height direction decreases). In other words, the lower projecting portion 25b is also substantially triangular with the tip at an acute angle.

  In addition, the amount by which the protruding portions 25a and 25b protrude with respect to the planes of the peak portion 21 and the valley portion 22 is about 0.5 mm to 2.0 mm. The tip angles of the protrusions 25a and 25b are, for example, about 10 ° to 60 °.

(B) Communication part The communication part 26 is a part which connects the upper projection part 25a and the lower projection part 25b. The connecting portion 26 has a flat surface extending from the upper protruding portion 25a to the lower protruding portion 25b. The condensed water that has flowed through the upper protrusion 25a flows through the communication portion 26 to the lower protrusion 25b. Thereafter, the condensed water is delivered from the lower protrusion 25b to the lower corrugated fin 20.

(3) Corrugated Fin Manufacturing Method The corrugated fin 20 according to the present embodiment is manufactured using a corrugated fin manufacturing apparatus 100 as shown in FIG. Hereinafter, a brief description of the corrugated fin manufacturing apparatus 100 and a method of manufacturing the corrugated fin 20 by the corrugated fin manufacturing apparatus 100 will be described.

(3-1) Corrugated Fin Manufacturing Device As shown in FIG. 4, the corrugated fin manufacturing device 100 mainly includes an uncoiler 90, a first processing device 30, and a second processing device 40. The corrugated fin manufacturing apparatus 100 unwinds the fin material 20a using the uncoiler 90, and then sends the fin material 20a sequentially to the first processing apparatus 30 and the second processing apparatus 40. Is a device for manufacturing the corrugated fin 20.

  Hereinafter, the configuration of the first processing apparatus 30 and the second processing apparatus 40 included in the corrugated fin manufacturing apparatus 100 will be described with reference to FIGS. 3 to 6.

(3-1-1) 1st processing apparatus The 1st processing apparatus 30 is an apparatus which processes first with respect to the fin material 20a drawn | fed out from the uncoiler 90, as shown in FIG. Specifically, the 1st processing apparatus 30 performs a slit formation process and a guide hole formation process to the fin material 20a. The slit forming process is to form slits for forming the louver 23 and the protrusions 25a and 25b in the fin material 20a. Further, the guide hole forming process is to form the guide hole 24 in the fin material 20a. Hereinafter, specific examples of the slit forming process and the guide hole forming process and the configuration of the first processing apparatus 30 for performing the slit forming process and the guide hole forming process will be described.

(A) Slit formation processing In this embodiment, as slit formation processing, a louver slit (first cut portion) 231 for forming the louver 23 and a protrusion slit for forming the protrusions 25a, 25b ( 2nd cut | notch part) 251 is formed (refer FIG. 3).

(A-1) Louver slit The louver slit 231 is formed in the region of the fin member 20a to be the heat transfer part P1, as described above. Specifically, the louver slit 231 is formed in the central region CR of the non-contact region NA as shown in FIG. A plurality of louver slits 231 are formed side by side in the width direction of the fin member 20a with reference to the height direction center position h1 of the non-contact area NA. The plurality of louver slits 231 formed in each non-contact area NA are formed on a straight line in the longitudinal direction of the fin material 20a.

  In the present embodiment, the louver slit 231 has a shape approximate to an isosceles trapezoid, and has a shape in which portions corresponding to the upper base and the lower base are rotated along the longitudinal direction of the fin material 20a ( (See FIG. 3). Specifically, a portion excluding the portion 233 corresponding to the upper base of the isosceles trapezoid is the louver slit 231. In FIG. 3, the louver slit 231 is indicated by a solid line. In other words, the louver slit 231 includes a first side extending in the vertical direction of the non-contact area NA and a second side extending at an acute angle from the upper and lower ends of the first side in the longitudinal direction of the fin material 20a. The louver slit 231 has a symmetrical shape with respect to the width direction center position c1 of the fin material 20a.

(A-2) Slit for Protrusion Portion The slit 251 for the protrusion portion is formed in each region of the fin material 20a that becomes the water guide portion P2, as described above. In other words, the protrusion slit 251 is located on the end region ER of the non-contact region NA and on the boundary line dl between the non-contact region NA and the contact region BA (on the boundary line between the end region ER and the central region CR). It is formed. The protrusion slit 251 is a substantially V-shaped portion indicated by a solid line 251 in FIG. A plurality of the protrusion slits 251 are formed along the longitudinal direction of the fin material 20a. Hereinafter, of the substantially V-shaped projection slit 251, the projection slit 251 of the portion formed in the end region ER and the projection slit 251 formed on the boundary line dl will be described in detail. explain.

  The protrusion slit 251 in the end region ER extends from the center in the width direction of the fin material 20a toward the end. Specifically, the protrusion slit 251 in the end region ER extends from the apexes ap1 and ap2 of the contact region BA on the first end side to the first end of the fin member 20a. More specifically, the protrusion slit 251 in the end region ER has a vertex ap1 that is at the first height position in the longitudinal direction of the fin material 20a and a height position that is different from the first height position ( It extends to the end of the second height position). Here, the height position of the end portion (second height position) is preferably the same height position as the apex ap2 at a height position different from the apex ap1 of the first height position. The protrusion slit 251 in the end region ER includes a first slit 251a and a second slit 251b. The first slit 251a is a slit that extends from the upper vertex ap1 of the contact area BA to an end portion (lower end portion) located at a position lower than the upper vertex ap1. The second slit 251b is a slit that extends from the lower apex ap2 of the contact area BA to an end (upper end) located above the lower apex ap2. The first slits 251a and the second slits 251b are alternately formed in the longitudinal direction of the fin material 20a. Note that, as described above, the corrugated fin 20 has a symmetrical shape with respect to the center position c1 in the width direction of the fin material 20a. Therefore, the same kind of slits 251a and 251b are formed in the end region ER in the left-right direction with respect to the center position c1 in the width direction of the fin material 20a. That is, when the 1st slit 251a is formed in the width direction right side of the fin material 20a, the protrusion part slit 251 formed in the same height position on the width direction left side of the fin material 20a is the 1st slit 251a.

  Further, the protrusion slit 251 formed on the boundary line dl extends from the apex ap1 of the contact area BA to the apex ap2 of the contact area BA, or from the apex ap2 of the contact area BA to the apex ap1 of the contact area BA. Therefore, the protrusion slit 251 formed on the boundary line dl is connected to the protrusion slit 251 in the end region ER by a substantially V-shaped tip.

(B) Guide hole formation process Guide hole formation process is forming the guide hole 24 in the fin material 20a as mentioned above. The guide hole 24 is formed at the center position c1 in the width direction of the fin material 20a and at the center position h1 in the length direction of the louver slit 231. The guide hole 24 is formed in each non-contact area NA across the contact area BA. In other words, the guide hole 24 is formed on a straight line along the center position h1 in the height direction of the non-contact area NA.

(C) Structure of 1st processing apparatus The 1st processing apparatus 30 is comprised by a pair of cylindrical rollers 31 and 32, as shown in FIG. The pair of cylindrical rollers 31 and 32 are arranged vertically in the height direction. The cylindrical rollers 31 and 32 perform the slit forming process and the guide hole forming process described above by rotating with the fin material 20a interposed therebetween. The cylindrical rollers 31 and 32 rotate when a shaft (not shown) is driven by a motor.

  FIG. 5 shows an example of the cylindrical rollers 31 and 41 according to this embodiment. The upper cylindrical roller (upper cylindrical roller) 31 and the lower cylindrical roller (lower cylindrical roller) 32 are arranged so that the fin material 20a can be processed by sandwiching the fin material 20a. In addition, it is configured to be able to mesh. Hereinafter, the configuration of the upper cylindrical roller 31 will be mainly described. The lower cylindrical roller 32 may have the configuration of the upper cylindrical roller 31.

  The width dimension w30 of the upper cylindrical roller 31 is the same as the width dimension w2 of the fin material 20a or larger than the width dimension w2 of the fin material 20a. The width dimension of the upper cylindrical roller 31 and the width dimension of the lower cylindrical roller 32 are the same.

  The upper cylindrical roller 31 has a blade 33 attached to the surface thereof. The blades 33 formed on the surface include a first blade 33a, a second blade 33b, and a third blade 33c. The first blade 33 a is a blade for forming the louver slit 231. The second blade 33 b is a blade for forming the protrusion slit 251. The third blade 33 c is a blade for forming the guide hole 24. The first blade 33a, the second blade 33b, and the third blade 33c are continuously arranged on the roller surface so that the above-described processing is performed. The first blade 33 a has the same shape as the louver slit 231. The second blade 33b has the same shape as the projection slit 251. The third blade 33 c has a rectangular shape like the guide hole 24. On the surface of the lower cylindrical roller 32, the first blade 33a, the second blade 33b, and the third blade are located at positions corresponding to the first blade 33a, the second blade 33b, and the third blade 33c. A recess into which 33c can be inserted is formed.

(3-1-2) 2nd processing apparatus The 2nd processing apparatus 40 is arrange | positioned downstream of the 1st processing apparatus 30, as shown in FIG. The second processing device 40 is a device that further performs louver processing and bending processing on the fin material (first processed fin material) 20a processed by the first processing device 30. Hereinafter, the details of the louver processing and the bending processing and the configuration of the second processing device 40 will be described.

(A) Louver processing The louver processing is to form the louver 23 using the louver slit 231 formed in the fin material 20a. Specifically, the louver process is a process of bending a portion (adjacent portion 232) adjacent to the louver slit 231 in the portion of the fin material 20a in the non-contact area NA (see FIG. 3). In the present embodiment, the adjacent portion 232 is bent with reference to a portion (virtual line) indicated by a broken line 233. The imaginary line 233 is a line that connects the ends of the second sides constituting the louver slit 231 described above in the vertical direction. Due to the louver process, the adjacent portion 232 has a predetermined angle with respect to the plane.

(B) Bending process Bending process is changing the shape by the side view of the fin material 20a into a corrugated shape by bend | folding the fin material 20a in a longitudinal direction. Specifically, the bending process is to bend the fin material 20a in the non-contact area NA with respect to the fin material 20a in the contact area BR so as to have an angle close to 90 °.

  Specifically, in the bending process, the fin material 20a is bent in the longitudinal direction with reference to a portion (boundary line) DL serving as a boundary of the contact region BR. The boundary line DL is a portion orthogonal to the longitudinal direction of the fin material 20a. In the bending process, in the longitudinal direction of the fin material 20a, the two boundary lines DL and DL at the upper and lower positions of one contact region BR are bent in the same direction (either mountain fold or valley fold). . In the bending process, the mountain folds and the valley folds are alternately repeated so that the peak portions 21 and the valley portions 22 are alternately formed on the fin material 20a.

  In the bending process, when the fin material 20a is bent with reference to the boundary line DL, an upper portion and a lower portion of the fin material 20a sandwiching the protrusion slit 251 in the end region ER of the fin material 20a. Are separated. Thereby, either one of the upper part and the lower part of the fin member 20a sandwiching the protrusion slit 251 (the part that becomes the protrusion 25a) protrudes from the other surface. That is, the fin material 20a is bent with reference to the boundary line DL by a bending process, so that a protruding portion 25a protruding upward or downward with respect to the peak portion 21 or the valley portion 22 is formed. In other words, in the bending process, the ridge portion 21 and the valley portion 22 are formed in the fin material 20a, and the heat transfer portion P1 and the water guiding portion P2 are formed.

(C) Configuration of Second Processing Device The second processing device 40 includes a pair of gear-like rollers 41 and 42 as shown in FIG. The pair of gear-like rollers 41 and 42 are arranged vertically in the height direction. The gear rollers 41 and 42 perform the above-described louver processing and bending processing by rotating with the first processed fin material 20a interposed therebetween. The gear rollers 41 and 42 rotate when a shaft (not shown) is driven by a motor.

  FIG. 6 shows an example of a gear-like roller (upper gear-like roller) 41 disposed above according to the present embodiment. Note that the gear-like roller (lower gear-like roller) 42 disposed below has an upper gear so that the fin material 20a can be further processed by sandwiching the fin material 20a with the upper gear-like roller 41. It can be meshed with the roller 41. Hereinafter, the configuration of the upper gear roller 41 will be mainly described.

  The upper gear roller 41 has a plurality of tooth surfaces 43, a tooth tip surface 44, and a tooth bottom surface 45. The width dimension w40 of the tooth surface 43 is the same as the width dimension w1 of the central region CR of the fin material 20a. The tooth dimension L42 of the tooth surface 43 corresponds to the length dimension L2 of one non-contact area NA (specifically, the center area CR). The length dimension L41 of the tooth tip surface 44 and the tooth bottom surface 45 corresponds to the length dimension L1 of the contact region DL. That is, the tooth surface 43 corresponds to the heat transfer portion P1, and the tooth tip surface 44 and the tooth bottom surface 45 correspond to the peak portion 21 or the valley portion 22, respectively. The upper gear roller 41 and the lower gear roller 42 have the same dimensions.

  The upper gear-like roller 41 is formed with a plurality of convex portions 46 and one guide hole holding portion 47 on each tooth surface 43. The convex portion 46 is for forming the louver 23. Specifically, the convex portion 46 is a portion for bending a portion (adjacent portion) 232 of the fin material 20 a adjacent to one side of the louver slit 231 with reference to the virtual line 233. The convex portion 46 may have, for example, a mountain shape having an acute tip portion. Due to the convex portion 46, the adjacent portion 232 of the fin material 20 a is inclined at a predetermined angle with respect to the adjacent plane across the virtual line 233. The guide hole holding part 47 is a part that holds the guide hole 24. Specifically, the guide hole holding portion 47 also protrudes with respect to the guide hole 24. Since the guide hole holding portion 47 projects into the guide hole 24, the movement of the fin material 20a in the width direction and the longitudinal direction is suppressed, and the fin material 20a is positioned. In other words, when the guide hole holding portion 47 projects into the guide hole 24, the position in the width direction and the longitudinal direction of the fin material 20a is defined. The lower gear-like roller 42 is formed with a concave portion that can be engaged with the convex portion 46 and a concave portion that meshes with the guide hole holding portion 47 so that the lower gear-like roller 42 can mesh with the upper gear-like roller 41. ing. One tooth surface 43 of the gear-like rollers 41 and 42 is configured to allow louver processing for one non-contact area NA.

(3-2) Flow of Manufacturing Method Next, a manufacturing method of the corrugated fin 20 according to the present embodiment will be described with reference to FIG.

  First, the fin material 20a is supplied by the uncoiler 90 in step S1. The fin material 20a is sent to the first processing apparatus 30 in a state where the surface is parallel to the horizontal plane.

  Next, in step S2, the fin material 20a is sandwiched between the cylindrical rollers 31 and 32, so that the fin material 20a is subjected to slit formation processing and guide hole formation processing (first step). Here, as the slit forming process, a louver slit 231 and a protrusion slit 251 are formed in the fin material 20a. A plurality of louver slits 231 are formed side by side in the width direction of the fin material 20a in the central region CR of each non-contact region NA. The protrusion slit 251 is formed on the end region ER of the non-contact region NA and on the boundary line dl between the non-contact region NA and the contact region BA (on the boundary line between the end region ER and the central region CR). . Further, as the guide hole forming process, the guide hole 24 is formed at the center in the width direction of the fin material 20a and sandwiched by the louver slits 231. Thereafter, the process proceeds to step S3.

  In step S3, the central region CR of the fin material 20a is sandwiched between the gear-like rollers 41 and 42 to position the fin material 20a, and the louver process and the bending process are performed on the fin material 20a (second step). Here, as the louver processing, the adjacent portion 232 adjacent to the louver slit 231 is bent with reference to the virtual line 233. Further, as a bending process, the edge of the tooth tip surface 44 or the edge of the tooth bottom surface 45 is brought into contact with the boundary line DL of the fin material 20a, and the fin material 20a is bent in the longitudinal direction with reference to the boundary line DL. Thereby, the peak part 21 and the trough part 22 are alternately formed in the fin material 20a, and the side view shape of the fin material 20a is changed into a wave shape. Note that when the fin material 20a is bent with reference to the boundary line DL, the end region ER of the fin material 20a is separated vertically in the longitudinal direction across the protrusion slit 251. Of the separated end region ER, either the upper part or the lower part serves as the protrusion 25a of the water guiding part P2.

(4) Features (4-1)
In the manufacturing method of the corrugated fin according to the embodiment, the corrugated fin 20 having the water guiding portion P2 is manufactured. When the corrugated fin is used in the heat exchanger, the water guide portion P2 is formed to guide the condensed water generated in the heat exchanger in one direction. The protrusions 25a and 25b at the upper and lower ends of the water guide portion P2 are portions having a minute area formed by using the end region ER of the fin material 20a. Specifically, the protrusions 25a and 25b have a substantially triangular shape with a sharp tip. Therefore, in the manufacture of the corrugated fins, the shapes of the protrusions 25a and 25b are liable to collapse.

  However, in the manufacturing method of the corrugated fin according to the above-described embodiment, in the first processing apparatus 30, after the protrusion slits 251 for forming the protrusions 25a and 25b are formed, the fins that become the protrusions 25a and 25b are formed. The protrusions 25a and 25b can be formed without contacting the portion of the material 20a. One end of the projection slit 251 extends to the apexes ap1 and ap2 of the contact area BA. Therefore, when the fin material 20a is bent with reference to the boundary line DL, the portions that become the protrusions 25a and 25b in the non-contact area NA protrude from the plane of the contact area BA. Thereby, a part of fin material 12a can be raised with respect to the part used as the peak part 21 or the trough part 22 with few processes.

(4-2)
In the corrugated fin manufacturing method according to the above embodiment, the gear rollers 41 and 42 sandwich only the central region CR of the fin material 20a and do not sandwich the end region ER. That is, since it does not contact the portion of the fin material 20a that becomes the water guide portion P2, the surface of the water guide portion P2 can be kept flat. Thereby, when the corrugated fin 20 is used in the heat exchanger 10, the water drainage property by the water guide part P2 can be improved.

(4-3)
In the corrugated fin manufacturing method according to the above-described embodiment, the cylindrical rollers 31 and 32 sandwich the fin material 20a and rotate to apply slit forming processing and guide hole forming processing to the fin material 20a. After that, the gear rollers 41 and 42 sandwich the fin material 20a and rotate, so that the fin material 20a is further subjected to louvering and bending. That is, since each process is performed by the rollers 31, 32, 41, 42, the manufacturing efficiency of the corrugated fin 20 can be improved.

(4-4)
Furthermore, in the corrugated fin manufacturing method according to the above-described embodiment, the protrusion slits 251 extending at different height positions along the longitudinal direction of the fin material 20a are formed at the end of the fin material 20a. As a result, the protrusions 25a. The tip of 25b can be made into an acute angle, and water draining performance can be improved.

(5) Modification (5-1) Modification A
In the corrugated fin manufacturing method according to the above embodiment, the shape of the louver 23 is an elongated rectangle extending in the height direction of the heat transfer part P1, but the louver 23 may have other shapes.

(5-2) Modification B
In the above embodiment, the case where the protrusions 25a and 25b are substantially triangular has been described. Here, the protrusions 25a and 25b do not have to be substantially triangular as long as the width becomes narrower toward the tip.

(5-3) Modification C
The number and shape of the protrusions 25a and 25b formed in the above embodiment may be arbitrary. In the manufacturing method of the corrugated fin according to the above-described embodiment, the protrusions 25a and 25b can be protruded from the peak portion 21 or the valley portion 22 without touching the portion of the fin material 20a that becomes the protrusion portions 25a and 25b. . Therefore, even if it is a case where projection part 25a, 25b is comprised by a small area, suitable projection part 25a, 25b can be formed.

(5-4) Modification D
In the above embodiment, the second processing apparatus 40 performs the bending process, and the fin material 20a in the non-contact area NA is bent at an angle close to 90 ° with respect to the fin material 20a in the contact area BR. Here, in the 2nd processing apparatus 40, it is set as the structure which bends the fin material 20a slightly, and the fin material 20a is bent at 90 degrees or an angle close | similar to 90 degrees with another apparatus arrange | positioned downstream of the 2nd processing apparatus 40. It is good also as a structure.

(5-5) Modification E
In the corrugated fin manufacturing method according to the above embodiment, the fin material 20a processed by the first processing apparatus 30 is then sent directly to the second processing apparatus 40 (see FIG. 4). Here, it is good also as a structure which provides the mediation roller 50 for suppressing the position shift of the width direction of the fin material 20a between the 1st processing apparatus 30 and the 2nd processing apparatus 40 (refer FIG. 8). Thereby, position shift of fin material 20a can be controlled more effectively.

(5-6) Modification F
In the corrugated fin manufacturing method according to the above embodiment, the formation of the louver slits 231 and the louver processing are performed by different apparatuses 30 and 40. Specifically, the louver slit 231 was formed by the first processing device 30, and the louver processing was performed by the second processing device 40. Here, the formation of the louver slit 231 and the louver processing may be performed by the same apparatus 40. For example, in the 2nd processing apparatus 40, the 1st blade 33a for forming the slit 231 for louvers is formed in the roller surface of one of the gear-shaped rollers 41 and 42. Further, a convex portion 46 is formed on the surface of the other roller to bend the portion (adjacent portion) 232 of the fin material 20a adjacent to one side of the louver slit 231 with respect to the virtual line 233. When the fin material 20a is sandwiched between the gear rollers 41 and 42, a louver slit 231 is formed in the fin material 20a, and then the adjacent portion 232 of the fin material 20a is raised with reference to the virtual line 233. Even if it is such a structure, the corrugated fin 20 similar to the said embodiment can be manufactured.

DESCRIPTION OF SYMBOLS 10 Heat exchanger 12, 13 Header 11 Flat tube 11 Horizontal part 20 of flat tube Corrugated fin 21 Mountain part 22 Valley part 23 Louver 24 Guide hole 25a, 25b Protrusion part 26 Connection part 231 Slit for louvers (2nd cut)
251 Protrusion slit (first cut)
P1 Heat transfer part P2 Water transfer part BA Contact area NA Non-contact area CR Central area (central part)
ER edge area (edge)
DL boundary (boundary part)

JP 2010-2138 A

Claims (5)

A first step of forming a first cut (251) in a width direction end (ER) of the fin material (12b) for guiding condensed water adhering to the surface of the fin material;
A second step of sandwiching the width direction center portion (CR) of the fin material, which is a portion excluding the end portion, with a gear-like roller (41, 42), and bending the center portion in the length direction of the fin material;
Comprising
A manufacturing method of corrugated fins. In the second step, a heat transfer part (P1) for heat exchange with air is formed in the center part of the fin material by bending the center part of the fin material in the length direction of the fin material, Further, a water guide part (P2) for guiding the condensed water by projecting from the heat transfer part at the end of the fin material is formed.
The manufacturing method of the corrugated fin of Claim 1. In the first step, the first cut is formed in the end portion of the fin material using a cylindrical roller (31, 32) that contacts the end portion from the central portion.
The manufacturing method of the corrugated fin of Claim 1 or 2. In the first step, the first cut is formed such that the width dimension of the tip of the water guide section is smaller than the width dimension of the root of the water guide section.
The manufacturing method of the corrugated fin of Claim 2 or 3. In the first step, the first cut extending from the first position to a second position, which is a different position along the longitudinal direction of the fin material, is formed.
The manufacturing method of the corrugated fin in any one of Claim 1 to 4.

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