JP2015075260A - Header for heat exchanger, heat exchanger provided with the header, and manufacturing method of the header - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a header for a heat exchanger at a low cost by simply, easily, and reliably inserting tubes into slit holes collectively without disposing an external member such as a positioning member onto the tubes.SOLUTION: A plurality of slit holes is formed in a direction at right angle to the longitudinal direction in a thick cylindrical pipe by perforating and slenderly opening a part of the cylindrical pipe, an opening surface part being formed by plastic-deforming the formed opening part toward the cylindrical pipe inner side. The slit hole is formed into such a shape that a curve surface formed toward the cylindrical pipe inner side on an opening inlet surface opposite to a width direction of the opening surface part, both wall surface parts opposed with a constant width, and a flare provided on both edge parts of the opening surface part and protruding toward the cylindrical pipe outer side corresponding to punch both edge shapes are formed.

Description

  The present invention relates to a header for a heat exchanger, a heat exchanger provided with the header, and a method for manufacturing and assembling the header.

  Conventionally, heat exchanger headers (also referred to as header pipes) feed a flat plate material at a predetermined pitch in the longitudinal direction, and sequentially form slit holes as tube insertion holes in this material while feeding. It was gradually rolled up to form a lead-tubular header. Patent Document 1 describes a heat exchanger header pipe formed in this manner.

  A heat exchanger for a carbon dioxide refrigeration cycle has been adopted. With the adoption of a heat exchanger for a carbon dioxide refrigeration cycle, a cylindrical tube made of a thick aluminum material has come to be used in order to have a structure that can withstand the pressure of a high-temperature and high-pressure refrigerant.

  In Patent Document 2, carbon dioxide is used as a refrigerant, and a heat exchanger inserts a core formed by alternately laminating flat tubes and corrugated fins provided with louvers, and ends of the tubes. There is described a configuration that includes a tank provided with a large number of holes (tube slits) and performs heat exchange with heat transmitted to the core by a refrigerant flowing through the tube.

  In Patent Document 3, in order to improve the ease of assembly of tubes during manufacturing, a plurality of tubes can be collectively inserted into the mounting holes of the headers opened to the respective tubes. It is described that a positioning member is provided on the tube.

JP-A-10-89883 JP 2003-112222 A JP 2000-46441 A

In recent years, as shown in Patent Document 2, the influence of chlorofluorocarbon gas on the natural environment has become a problem, and the use of carbon dioxide gas as a refrigerant instead of chlorofluorocarbon has attracted attention and has been used. Although carbon dioxide gas has the advantage of being nonflammable and less toxic, the pressure is very high, for example, about 35 kg / cm ² on the low pressure side of 30 ° C. and about 80 to 110 kg / cm ² on the high pressure side. Even in the stop state, the internal pressure of the pipe reaches 100 kg / cm. For this purpose, a thick cylindrical tube is employed.

  A structure has been proposed in which slit holes, which are a number of tube mounting holes, are formed in such a thick cylindrical tube. In this case, the tubes are collectively inserted into the slit holes provided in the header. However, the operation of inserting the tubes into the slit holes, which are the pores, is extremely difficult and laborious. Patent Document 3 describes that a measure such as providing a positioning member on the tube is taken as a countermeasure in this case. However, in such a structure, it is difficult to insert the tubes into the slit holes all at once. In order to insert the tubes into the slit holes all at once, adjustment not only in the X-axis direction but also in the Y-axis direction is required. The conventional structure cannot meet such a demand.

  In view of such a point, the present invention can easily and surely insert the tube tip portion into the slit hole which is a fine hole, and can be an external member such as a positioning member for the tube and other members. It is an object of the present invention to reduce the amount of processing so that the cost can be manufactured at a low cost.

  In the present invention, a thick-walled cylindrical tube is used as a raw material before processing, and in the state of this cylindrical tube, it is formed toward the inside of the cylindrical tube on the opening entrance surface facing the width direction of the formed opening surface portion. A curved surface having a horizontal cross section length of 0.5 ± 0.3 mm, preferably a curved surface of 0.5 ± 0.1 mm, and a flare projecting outward from the cylindrical tube were formed. A large number of elongated slit holes are formed in parallel. The curved surface and the flare serve as a guide portion when the tubes are collectively inserted and perform a guide function to facilitate the batch insertion operation.

In the present invention, specifically, a thick cylindrical tube made of, for example, an aluminum material is used, and the cylindrical tube is provided with a plurality of parallel slit holes, for example, in a direction perpendicular to the longitudinal direction. A heat exchanger header,
The slit hole is
The cylindrical tube is perpendicular to the longitudinal direction, and a part of the thick cylindrical tube is punched out to be elongated and the formed opening is plastically deformed toward the inside of the cylindrical tube. As a result, an opening surface portion is formed, a curved surface formed toward the inside of the cylindrical tube on the opening entrance surface facing the width direction of the opening surface portion, a wall surface portion having a facing configuration, and an outside of the cylindrical tube at the end of the opening surface portion. There is provided a heat exchanger header characterized by being formed in an elongated shape formed with a flare protruding toward the direction.
The present invention is a header of a heat exchanger in which a thick cylindrical tube is used, and the cylindrical tube is provided with a plurality of parallel slit holes in a direction perpendicular to the longitudinal direction, for example,
The slit hole is
A die having a flat portion is disposed in the cylindrical tube in advance, and a punch is press-fitted into the cylindrical tube in a direction perpendicular to the longitudinal direction toward the flat portion of the die, thereby increasing the thickness of the die. A part of the cylindrical tube is punched and opened in an elongated shape, and an opening surface part is formed by plastically deforming the formed opening toward the inside of the cylindrical tube, and the opening facing the width direction of the opening surface part A curved surface is formed on the entrance surface toward the inside of the cylindrical tube, and a projection is formed on the exit surface of the opening so that the tip on the opposite side of the curved surface abuts on the flat portion of the die. And a header of a heat exchanger, characterized in that it is formed in an elongated shape in which flares projecting outwardly of a cylindrical tube are formed at both ends of an opening surface portion.

  The present invention provides a header for a heat exchanger, wherein the curved surface formed toward the inside of the cylindrical tube has a shape having substantially the same width in the longitudinal direction. provide.

  The present invention provides the header of the heat exchanger described above, wherein the curved surface formed toward the inside of the cylindrical tube is formed in an arc shape in the longitudinal direction.

The present invention provides the above-described heat exchanger header,
The outer cylindrical tube is provided with a partition cut hole formed on the opposite side of the slit hole in a direction perpendicular to the longitudinal direction,
By inserting another punch into the partition cut-out hole, a part of the thick cylindrical tube is punched and opened to form an opening surface portion, and the cylindrical tube outer side is formed at both ends of the opening surface portion. A heat exchanger header is provided which is formed in an elongated shape formed with other flares projecting toward the surface.

The present invention provides the above-described heat exchanger header,
A header of a heat exchanger characterized in that an adhesive portion into which a brazing material is injected during assembly is formed in a gap formed above the curved surface due to the curved surface shape formed toward the inside of the cylindrical tube. provide.

The present invention provides a heat exchanger in which a tube constituting a heat exchanger is inserted into the header described above and both are brazed.
The present invention is a method for forming a header of a heat exchanger, in which a thick cylindrical tube is used, and the cylindrical tube is provided with a plurality of parallel slit holes in a direction perpendicular to the longitudinal direction, for example. ,
In the cylindrical tube, a flat portion and a die formed by punching to form a piece storage chamber are disposed in advance,
Next, a punch is press-fitted into the cylindrical tube in a direction perpendicular to the longitudinal direction toward the flat portion of the die, so that a part of the thick-walled cylindrical tube is punched out to be elongated and opened. Is formed, and the formed opening surface portion is plastically deformed toward the inside of the cylindrical tube, whereby a curved surface is formed toward the inside of the cylindrical tube on the opening entrance surface facing the width direction of the opening surface portion, and the opening exit The surface is formed with a protrusion whose tip opposite to the curved surface abuts against the flat portion of the die, and a wall portion having a facing configuration is formed between the curved surface and the protrusion, and protrudes outward from the cylindrical tube at both ends of the opening surface portion. An elongated first slit hole formed with a first flare is formed,
Another punch is press-fitted into the opening surface portion formed toward the flat portion of the die, and second flares projecting outward from the cylindrical tube are formed at both ends of the opening surface portion to form an elongated second Slit holes are formed,
Provided is a method of manufacturing a header of a heat exchanger, wherein a die is punched and pulled out from a cylindrical tube with a piece.

  The present invention is a notch plate in which the tube of the heat exchanger is collectively inserted into the header of the heat exchanger described above using the curved surface formed on the header and the first flare as a guide, and the inside of the cylindrical tube is separated into two. Is assembled with the second flare as a guide, and provides a method of assembling the heat exchanger tube into the header.

  According to the present invention, as described above, by inserting a punch for processing into a header that becomes a cylindrical tube, the curved surface of the opening entrance surface is directed toward the inside of the cylindrical tube, and outward of the cylindrical tube. A slit hole with a flare projecting toward it is formed, and when the slit hole is formed in the header that becomes a cylindrical tube, a tube insertion guide structure is formed, and the header itself is the tube insertion guide. Will have a structure. As a result, it is possible to easily and surely insert the tube into the slit hole in a lump, and the cost can be reduced by reducing the number of processing steps and the processing amount without providing an external member such as a positioning member on the tube. It is possible to provide a guide structure for inserting a tube with a low cost.

The top view which shows the form of an Example of this invention. The side view which shows the form of this invention Example. The rear view which shows the form of this invention Example. The side view from the longitudinal direction of the form shown in FIG. The figure which shows the form of a slit hole. AA sectional drawing of FIG. FIG. 6 is a cross-sectional view taken along line AA in FIG. 5 and a cross-sectional view taken along line CC in FIG. 2. DD sectional drawing of FIG. EE sectional drawing of FIG. The figure which shows the form of dice | dies. The figure before the process which shows the formation method of the notch | incision hole 12 for a partition. The figure after the process which shows the formation method of the notch | incision hole 12 for a partition. The A section enlarged view of FIG. 18B. The figure explaining the accommodation state of the extraction piece. The divide | boring hole drawing which shows the state before processing a slit hole. The divide hole drawing which shows the state after processing a slit hole. The divide | boring hole drawing which shows the state before processing a floor. The divide | boring hole drawing which shows the state after processing a floor. The figure which shows the state which assembles a tube to a header. The figure which shows the form of the other Example of this invention, and respond | corresponds to FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 is a top view of a header 100 of a heat exchanger according to an embodiment of the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a back view thereof. 4 is a view of the state shown in FIG. 2 as viewed from the side in the longitudinal direction. 5 is an enlarged view of a portion B, FIG. 6 is an AA sectional view, FIG. 7 is an AA sectional view and a CC sectional view, FIG. 8 is a DD sectional view, and FIG. -E shows a cross-sectional view.

  As shown in FIGS. 1, 2 and 4-8, the header 100 of the heat exchanger according to the embodiment of the present invention uses a cylindrical tube 1 made of a thick aluminum material. It is a header of a heat exchanger provided with a large number of parallel slit holes 2 in a direction perpendicular to the longitudinal direction. The material may be other material instead of aluminum material, but aluminum material is preferably used from the viewpoint of workability. In this embodiment, the term “thick” means that the thickness is thick in order to have a structure that can withstand the pressure of the high-temperature and high-pressure refrigerant as the heat exchanger for the carbon dioxide refrigeration cycle is adopted. As shown in FIG. 1, 23 slit holes 2 are formed in this example. The interval length between the slit holes is equal, and the elongated length and shape of the slit holes are also equal. That is, the shape, width, and depth of the slit holes are equal. The slit holes 2 are similarly arranged side by side in a planar shape, and have the same shape and the same arrangement. The space between the slit holes includes a curved surface 4 formed on the opening surface portion and a curved surface portion in the circumferential direction. The curved surface 4 is along the curved surface portion in the circumferential direction. In this embodiment, the curved surface is a surface inclined toward the formed opening, and is a curved shape formed by combining a curved surface inclined in the depth direction from the upper surface and a composite plane. Including face. Plastic deformation caused by normal plastic flow results in a curved surface, but this curved surface can be further processed to form a combined plane combination.

  The slit hole 2 is perpendicular to the longitudinal direction of the cylindrical tube 1, and a part of the thick cylindrical tube is punched into an elongated shape, and the formed opening portion is directed toward the inside of the cylindrical tube. An opening surface portion is formed by plastic deformation, and a curved surface 4 formed toward the inside of the cylindrical tube on the opening entrance surface facing the width direction of the opening surface portion 3, a wall surface having a constant width opposed surface configuration And an opening surface portion corresponding to the shape of both ends of the punch, and formed into an elongated shape formed with a flare 6 projecting outward from the cylindrical tube. That is, the slit hole 2 includes a curved surface 4 and a flare 6 in the opening surface portion 3 in the X-axis direction and the Y-axis direction, respectively.

Each of the curved surface portions between adjacent slit holes can be manufactured to have a width that is twice or more the slit hole width. With this structure, it is possible to ensure a large contact area when a member is arranged in contact with the inner surface of the cylindrical tube.

  In FIG. 6, the opening surface portion 3 has a cylindrical tube length of 230.5 mm, an outer radius of 17.7 mm, a tube wall thickness of 2.55 mm, a slit length of 11.4 mm, a width of 1.38 mm, a curved surface curvature R2, The width and depth of the curved surface are 0.5 mm, the size of the inward projection 7 is 0.5 mm, the flare direction is 45 ° outward, the flare 6 curvature R1, and the minimum gap between the flare is 9 mm. The slit hole 2 is formed in an elongated shape with a curved surface formed inward of the cylindrical tube having substantially the same width in the longitudinal direction. The shape having substantially the same width means that the shapes formed by plastic deformation caused by the same operating conditions are substantially the same. The elongate direction is the slit hole longitudinal direction. However, the shape of the slit hole 2 and the shape of the opening surface portion 3 are not limited to these values, but the width and depth of the curved surface are 0.5 ± 0.2 mm at the maximum, preferably 0.5 ± 0.1 mm. A narrow one like this is acceptable. By making the slit hole 2 into a narrow shape in this way, processing is simplified and simplified, and the tube tip can be sufficiently guided in the width direction with the narrow shape. In addition, by forming a curved surface in this way, a gap is formed when assembled on the upper side of the curved surface, but this gap can be used as a brazing material accommodation gap for joining the curved surface and the tube. This brazing material accommodation space is indicated by numeral 60 in FIG. Similarly, the flare 6 is formed with a narrow shape, but the tube tip can be sufficiently guided in the longitudinal direction.

  Thus, with respect to the tube thickness of 2.55 mm, the depth of the curved surface and the horizontal width are as small as 0.5 mm, and the curvature is as small as R2. Further, the flare 6 slightly protrudes outward to about 1 mm. In the present embodiment, while a small curved surface 4 and a small flare 6 are simply formed in the cylindrical tube 1, a guide sufficient for easily guiding and inserting a tube (described later) is formed. The slit hole width is determined corresponding to the tube width to be inserted.

Each of the curved surface portions between adjacent slit holes has a width that is twice or more the slit hole width.
Refrigerant (carbon dioxide) lead-out holes 9A and 9B are provided at both ends of the slit hole 2 on the opposite side.

  In FIG. 3 and FIG. 9, one partition cut hole 12 is formed on the opposite side of the slit hole 2 in a direction perpendicular to the longitudinal direction, and another punch is press-fitted, so that the thick cylindrical tube A part is punched and opened, and the formed opening is plastically deformed toward the inside of the cylindrical tube to form an opening surface, and the opening surface facing the width direction of the opening surface 3 is opened in the cylindrical tube. A curved surface 4 formed toward the side, a wall surface portion having a constant width and facing configuration, and a flare 6 projecting outward from the cylindrical tube corresponding to the shape of both ends of the punch at the end of the opening surface. It is formed into a shape. The flare 14 may have a standing shape or a circular shape. When the flare 14 has a circular shape as in this example, for example, R7.6 can be used. In the present embodiment, the former flare 6 may be called a first flare and the latter flare 14 may be called a second flare.

  Next, a manufacturing method of the slit hole 2 having the above-described shape and the partition cut-in hole 12 will be described.

  First, the dice adopted in the present embodiment will be described. The configuration of the die 10 is shown in FIG. The die 10 is manufactured in a circular cross section as a whole and is in close contact with the inner surface of the cylindrical tube 1. A part of the outer surface is planar.

  As shown in FIG. 10, prior to the production of these holes, a die 15 is placed in advance in the cylindrical tube 1 (the dotted line indicates the inner surface of the cylindrical tube) and installed on the inner bottom surface of the cylindrical tube. As described above, the die 15 has an outer surface shape that is in close contact with the inner surface of the cylindrical tube, and an upper end portion that is a planar shape flat portion 16. With this shape, a gap 17 is formed between the inner surface of the cylindrical tube.

  On the flat surface portion 16 of the die 15, cut grooves 18 into which the punch tip portion can be inserted are regularly formed in parallel corresponding to the position of the slit hole 2 to be processed. Therefore, the groove depth of the cut groove 18 is set to a depth that the tip of the inserted punch does not reach.

  At the lower end of the cut groove 18, there is formed a cut piece storage chamber 19 for a cut piece 61 that bulges downward.

11 and 12 show a method for forming the slit hole 2. FIG. 11 is a diagram before processing, and FIG. 12 shows a diagram after processing. FIG. 11A shows a cross section before processing, and FIG. 11B shows a cross section before processing. FIG. 12A shows a cross section after processing, and FIG. 12B shows a side surface after processing.
FIG. 13 is an enlarged view of A in FIG. 12B.

As shown in FIG. 11A, the punch 21 is controlled by the processing machine 22 in the vertical direction and driven. The punch 21 is moved downward in a controlled state by the processing machine 22. At this time, a die 15 having a flat portion 16 is disposed in the cylindrical tube in advance, and the cylindrical tube 1 is perpendicular to the longitudinal direction and is directed to a groove 18 provided in the flat portion 16 of the die 15. The punch 21 is press-fitted.
The punch 21 has a thin plate shape, and is formed with an arcuate blade portion 22 that protrudes from the center and is symmetrical with respect to a vertical line. The width of the arcuate blade portion 22 is the inner cylinder diameter of the cylindrical tube 1. A contact portion 23 that abuts on the outer surface of the cylindrical tube is formed thereabove. The contact portion 23 has a flat plate shape (FIG. 11B) that is thicker than the arcuate blade portion 22, and the left and right end portions are 45 ° upward. It has a shape that jumps in the direction. A region between the arcuate blade portion 22 becomes a pressing portion 24 that causes plastic deformation by plastic flow.

  The distance between the blade surface of the arcuate blade portion 22 and the contact portion 23 is the thickness of the cylindrical tube. At the time of processing, as shown in FIG. 11B, the die 15 shown in FIG. 10 is stored in the cylindrical tube 1 in advance in the cylindrical tube 1. As described with reference to FIG. 10, the die 15 is formed with the cut groove 18 and the extracted piece storage chamber 19 in which the tip portion swells, and the punch 21 moves in the direction of the cut groove 18.

  When the punch 21 is processed and moved by the processing machine 22, the state shown in FIGS. 12A and 12B is obtained.

  In FIG. 12A, the arcuate blade portion 22 of the punch 21 cuts the cylindrical tube 1, extracts the elongated piece, and forms the slit hole 2. The elongated piece becomes the cut piece 61 and is pushed by the arcuate blade portion 22 to be stored and held in the cut piece storage chamber 19. In this state, as shown in FIG. 12B, the arcuate blade portion 22 is inserted into the cylindrical tube 1 inside the cylindrical tube. FIG. 13 shows the state in an enlarged manner.

  FIG. 13 shows the state at this time. A part of a thick cylindrical tube is punched out by the arcuate blade 23 to generate a punched piece 61 by punching, and the opening surface portion 3 is formed and pressed by the pressing portion 24. The opening surface portion 3 formed by the above is plastically deformed toward the inside of the cylindrical tube, the curved surface 4 toward the inside of the cylindrical tube on both opening entrance surfaces facing the opening surface portion, and the inside of the cylindrical tube toward the opening exit surface. Thus, a protrusion shape 27 of the tip protrusion protruding is formed. At this time, the front end protrusion 27 of the opening surface portion 3 abuts on the flat surface portion 16 of the die 15, so that the opening surface portion that is to be rounded in the longitudinal direction is controlled and fixed, and the opening surface portion 5 pressing portion 24 moves downward. The tip protrusion 27 is plastically deformed. As a matter of course, the curved surface 4 and the protruding shape 27 are formed on both sides. This narrow curved surface 4 is formed with a constant curvature and a constant curvature in the longitudinal direction of the slit hole 2, and when the tube is inserted into the slit hole 2, as will be described later, the tube tip is securely placed in the slit hole 2 direction. Can be guided to.

  When the cylindrical tube 1 is cut, the arcuate blade portion 42 symmetric with respect to the central projecting vertical line pushes and bends the longitudinal end of the slit hole 2 upward due to the circular arc shape. A flare (tip sharpness) is formed. This part becomes the first flare.

  In this way, the slit hole 2 shown in FIGS. 1, 2, 5, and 6 is formed, and the curved surface 4 shown in FIG. 6 and the flare 6 shown in FIG. 8 can be formed.

  In FIG. 13, a gap 60 is formed along the pressing portion 24 when the punch 20 is pulled out above the curved surface 4. This gap 60 is used as a brazing pool for brazing material storage during brazing. It functions, forms a joint, and ensures assembly of the header 100 and the tube 51 by joining the curved surface 4 and the tip of the tube by brazing.

  The flare 6 has a sharp protrusion shape with its tip portion directed inward. By presenting the sharp protrusion shape 27 (FIG. 13) with the tip portion facing inward, the tube can be reliably guided to the slit hole 2 in the longitudinal direction of the slit hole 2 when the tube tip portion described later is inserted. .

  In this way, a die having a flat portion is disposed in advance in the cylindrical tube, and a punch is press-fitted into the cylindrical tube in a direction perpendicular to the longitudinal direction toward the flat portion of the die. Then, a part of the thick cylindrical tube is punched and opened in an elongated shape, and the formed opening is plastically deformed toward the inside of the cylindrical tube to form an opening surface portion, and the width of the opening surface portion. A curved surface is formed toward the inside of the cylindrical tube at the opening entrance surface facing in the direction, and the opposite end of the curved surface of the facing wall surface portion of the opening surface portion is in contact with the flat portion of the die, and in this state, the projection shape 27 is formed. The

  When the punch 21 is inserted into the opening surface portion toward the flat surface portion 16 of the die, flares projecting outward from the cylindrical tube corresponding to the shape of both ends of the punch are formed at both ends of the opening surface portion. In this way, a method of forming the slit hole 2 is performed.

  It is desirable for tube insertion to form both side surfaces of the wall surface so as to extend in the vertical direction in parallel.

  When the slit hole 2 is formed, a punched piece 61 is generated by punching. This extracted piece becomes an obstacle when the die 15 is pulled out from the cylindrical tube 1, and in an extreme case, the die 15 is fixed to the inner surface of the cylindrical tube and cannot be pulled out. In this embodiment, in order to avoid such a situation, a die 15 is disposed in a cylindrical tube as shown in FIG. By using this die 15, the punched piece 61, which tends to be rounded, is pushed into the storage room 19 for storing the punched piece 61 as shown in FIG. 14, and stored and held.

  As described above, when the slit hole 2 in which the curved surface 4 and the flare 6 are formed is formed and the die 15 is pulled out from the cylindrical tube 1, the extraction piece 19 is held in the piece storage chamber 19 and the inner surface of the cylindrical tube Therefore, the die 15 can be smoothly pulled out from the cylindrical tube 1 without adversely affecting the shape of the formed slit hole 2.

  In the following, the formation of the partition cut-in holes will be described as “divide hole punching” and “divide flare”.

  FIG. 15 shows a punch installation state with respect to the cylindrical tube 1 before divide punching, and FIG. 16 shows a cylindrical tube shape after processing. FIG. 15A shows a cross section before processing, and FIG. 15B shows a side surface before processing. Similarly, FIG. 16 (a) A shows a cross section after processing, and FIG. 16 (a) B shows a side surface after processing.

  In FIG. 15, the punch 30 is attached to a processing machine 31. The processing machine 31 includes a punch guide hole 32, the punch 31 is installed so as to be positioned in the punch guide hole, and the tip of the punch 31 contacts the outer surface of the cylindrical tube 1. The punch 31 has a thin plate shape, the tip is a projection 36, the tip is a symmetric two arcuate blade 33, and a width that gradually decreases toward the tip, and the length between both widths is a cylinder. The length reaches the inner surface of the tube 1 and can be cut as a slit-shaped piece by punching the thickness of the cylindrical tube. As a result, a slit hole is formed. The flare 14 is formed by the arcuate blade portion 33. The formed flare 14 is shown enlarged in FIG.

  A tip portion having these structures is integrated with the punch body 35.

  In FIG. 17, a flare forming punch 40, which is another punch, is used for the final formation of the flare 14 serving as a divide flare. As shown in FIG. 17, the flare forming punch 40 has a semicircular arc shape 43 in a front end outer surface portion 41 in a downward cross section.

  As shown in FIG. 17A, the front end outer surface portion 42 of the semicircular arc-shaped portion 41 of the flare forming punch 40 is inserted into a previously formed slit hole 43 before processing. The cylindrical tube 1 is brought into contact with the cylindrical tube 1 at a position in the middle of the semicircular arc surface, and the distal outer surface portion 42 of the semicircular arc shaped portion 41 of the flare forming punch 40 pushes the cylindrical tube apart. The side surface before processing is as shown in FIG. 17B. When the flare forming punch 40 is moved downward in such a state, the semicircular arc-shaped portion 41 guided by the tip outer surface portion 42 pushes outward the both end side flesh portions of the slit hole 2 and protrudes outward. The flare 14 having the shape as described above is formed.

  The created flare 14 is shown in FIG. In FIG. 9, as described above, one partition cut hole 12 is formed on the opposite side of the slit hole 2 in a direction perpendicular to the longitudinal direction, and the punch 40 is press-fitted, so that a thick cylindrical tube is formed. Is formed in a shape in which an opening surface portion 13 is formed, and flares 14 are formed at both ends of the opening surface portion 13 so as to protrude outward from the cylindrical tube corresponding to the punch end shape. It is formed. The flare 14 has a shape widely opened from the outer surface of the cylindrical tube outside the opening surface portion 13. The flare 14 has a shape that stands up in the vertical direction with the partitioning cut hole 12 interposed therebetween. At this time, the flare 14 has an upright shape opened outward. With this shape, when the notch plate is inserted into the partition notch hole 12, the tip can be reliably guided from the partition notch hole 12 into the cylindrical tube.

  As shown in FIG. 2, the flare 14 is formed from the vicinity of the slit hole 2, and the flare 14 is larger than the flare 6.

  In this way, one partition cut hole 12 is formed in the cylindrical tube 1 on the opposite side of the slit hole 2 in a direction perpendicular to the longitudinal direction, and the punch 42 is inserted, so that the thick cylindrical tube Is formed in a shape in which an opening surface portion 13 is formed, and flares 14 are formed on both ends of the opening surface portion 13 so as to protrude outward from the cylindrical tube corresponding to the shape of both ends of the punch. It is formed.

  FIG. 19 shows a state where a large number of tubes 51 of the heat exchanger 50 are inserted into the slit hole 2 of the header 100 formed as described above. As is well known, the heat exchanger 50 includes a large number of tubes 51 and a heat radiation plate 52 between the tubes 51.

  As shown in FIG. 19, the header 100 includes a curved surface 4 and a flare 6 in the width direction on the opening surface portion 3 of the slit hole 2. The tubes 51 of the heat exchanger 50 are collectively brought close to the header 100 and inserted into the formed slit hole 2. At that time, since the narrow curved surface 4 and the flare 6 are formed, the tube 51 is guided in the width direction (X-axis direction) and the longitudinal direction (Y-axis direction), and is surely and easily inserted into the slit hole 2. The insertion operation is extremely simple. The same applies when inserting a cut plate into the flare 14.

  When the tube 51 is inserted into the slit hole 2, both are firmly fixed by brazing.

  FIG. 20 shows a modification of FIG. The header 1 shown in FIG. 21 has substantially the same structure as the header 100 shown in FIG. 1, but the form of the curved surface 4 is different. Therefore, the above description is used for the configuration of the header 100 shown in FIG. In the case of this example, the size of the curved surface 4 is 0.5 ± 0.3 mm in terms of the maximum arc width.

  The curved surface 4 shown in FIG. 20 forms a curved surface as shown in FIGS. 11 and 12, and is further processed so as to be a curved surface having the curvature shown in FIG.

  In this way, the heat exchanger tube is assembled into the header, and the heat exchanger tube is inserted and assembled together using the curved surface 4 and the flare 6 formed in the header 100 as a guide. The

  Inside the cylindrical tube, a flat portion and a die 15 punched to form a piece storage chamber are disposed in advance.

  Next, a punch is press-fitted into the cylindrical tube in a direction perpendicular to the longitudinal direction toward the flat portion of the die, so that a part of the thick-walled cylindrical tube is punched out to be elongated and opened. Is formed, and the formed opening surface portion is plastically deformed toward the inside of the cylindrical tube, whereby a curved surface is formed toward the inside of the cylindrical tube on the opening entrance surface facing the width direction of the opening surface portion, and the opening exit The surface is formed with a protrusion whose tip opposite to the curved surface abuts against the flat portion of the die, and a wall portion having a facing configuration is formed between the curved surface and the protrusion, and protrudes outward from the cylindrical tube at both ends of the opening surface portion. An elongated first slit hole in which the first flare is formed is formed.

  Another punch is press-fitted into the opening surface portion formed toward the flat portion of the die, and second flares projecting outward from the cylindrical tube are formed at both ends of the opening surface portion to form an elongated second A slit hole is formed.

When a slit hole is formed in a header that becomes a cylindrical tube, a tube insertion guide structure is formed, and the header itself has this tube insertion guide structure.
As a result, it is possible to easily and surely insert the tube into the slit hole all at once, and it is possible to manufacture the tube at a low cost without providing an external member such as a positioning member on the tube. It becomes like this.

  DESCRIPTION OF SYMBOLS 1 ... Cylindrical tube, 2 ... Slit hole, 3 ... Opening surface part, 4 ... Curved surface, 6 ... Flare (1st flare), 12 ... Hole for cutting, 13 ... Opening surface part, 14 ... Flare (2nd Flares), 15 dies, 16 flat surfaces, 17 gaps, 18 slits, 19 punched-out chambers, 20 punches, 27 projection shapes, 50 heat exchangers, 51 tubes, 60 gaps (Joint part), 61 ... extraction piece, 100 ... header.

In FIG. 3 and FIG. 9, one partition cut hole 12 is formed on the opposite side of the slit hole 2 in a direction perpendicular to the longitudinal direction, and another punch is press-fitted, so that the thick cylindrical tube A part is punched and opened, and the formed opening is plastically deformed toward the inside of the cylindrical tube to form an opening surface, and the opening surface facing the width direction of the opening surface 3 is opened in the cylindrical tube. A curved surface 4 formed toward the direction, a wall portion 5 having a constant width and facing configuration, and a flare 6 projecting outward from the cylindrical tube corresponding to the shape of both ends of the punch are formed at the end of the opening surface. It is formed in an elongated shape. The flare 14 may have a standing shape or a circular shape. When the flare 14 has a circular shape as in this example, for example, R7.6 can be used. In the present embodiment, the former flare 6 may be called a first flare and the latter flare 14 may be called a second flare.

FIG. 13 shows the state at this time. A part of a thick cylindrical tube is punched out by the arcuate blade 23 to generate a punched piece 61 by punching, and the opening surface portion 3 is formed and pressed by the pressing portion 24. The opening surface portion 3 formed by the above is plastically deformed toward the inside of the cylindrical tube, the curved surface 4 toward the inside of the cylindrical tube on both opening entrance surfaces facing the opening surface portion, and the inside of the cylindrical tube toward the opening exit surface. Thus, a protrusion shape 27 of the tip protrusion protruding is formed. At this time, the front end protrusion 27 of the opening surface portion 3 abuts on the flat surface portion 16 of the die 15 so that the opening surface portion 3 which is to be rounded in the longitudinal direction is controlled and fixed, and the opening surface portion 3 is pressed against the pressing portion 24. Is plastically deformed downward to form a tip protrusion 27. As a matter of course, the curved surface 4 and the protruding shape 27 are formed on both sides. This narrow curved surface 4 is formed with a constant curvature and a constant curvature in the longitudinal direction of the slit hole 2, and when the tube is inserted into the slit hole 2, as will be described later, the tube tip is securely placed in the slit hole 2 direction. Can be guided to.

Claims (10)

A heat exchanger header in which a number of aligned slit holes are formed;
A thick-walled cylindrical tube is used as a raw material before processing, and the cylindrical tube is a curved surface formed toward the inside of the cylindrical tube on the opening entrance surface facing the width direction of the formed opening surface portion, and is horizontal. A large number of elongated slit holes in which a curved surface having a length of 0.5 ± 0.3 mm on the cross section in the direction and a flare protruding outward from the cylindrical tube are formed are formed in parallel. Heat exchanger header. A header of a heat exchanger, in which a thick-walled cylindrical tube is used, and a plurality of slit holes are formed in the cylindrical tube in a direction perpendicular to the longitudinal direction, in parallel with the longitudinal direction, or in a straight line. Because
The slit hole is
The cylindrical tube is perpendicular to the longitudinal direction, and a part of the thick cylindrical tube is punched out to be elongated and the formed opening is plastically deformed toward the inside of the cylindrical tube. As a result, an opening surface portion is formed, a curved surface formed toward the inside of the cylindrical tube on the opening entrance surface facing the width direction of the opening surface portion, a wall surface portion having a facing configuration, and an outside of the cylindrical tube at the end of the opening surface portion. A heat exchanger header, characterized in that it is formed in an elongated shape with a flare protruding toward the direction. A header of a heat exchanger, in which a thick-walled cylindrical tube is used, and a plurality of slit holes are formed in the cylindrical tube in a direction perpendicular to the longitudinal direction, in parallel with the longitudinal direction, or in a straight line. Because
The slit hole is
A die having a flat portion is disposed in the cylindrical tube in advance, and a punch is press-fitted into the cylindrical tube in a direction perpendicular to the longitudinal direction toward the flat portion of the die, thereby increasing the thickness of the die. A part of the cylindrical tube is punched and opened in an elongated shape, and an opening surface part is formed by plastically deforming the formed opening toward the inside of the cylindrical tube, and the opening facing the width direction of the opening surface part A curved surface is formed on the entrance surface toward the inside of the cylindrical tube, and a projection is formed on the exit surface of the opening so that the tip on the opposite side of the curved surface abuts on the flat portion of the die. A header of a heat exchanger, characterized in that it is formed in an elongated shape in which flares projecting outward from the cylindrical tube are formed at both ends of the opening surface portion.   The heat exchanger header according to any one of claims 1 to 3, wherein the curved surface formed toward the inside of the cylindrical tube is formed in a shape having substantially the same width in the longitudinal direction. Exchanger header.   The header of the heat exchanger according to any one of claims 1 to 3, wherein a curved surface formed inward of the cylindrical tube is formed in an arc shape in the longitudinal direction. . In the header of the heat exchanger according to any one of claims 1 to 3,
The outer cylindrical tube is provided with a partition cut hole formed on the opposite side of the slit hole in a direction perpendicular to the longitudinal direction,
By inserting another punch into the partition cut-out hole, a part of the thick cylindrical tube is punched and opened to form an opening surface portion, and the cylindrical tube outer side is formed at both ends of the opening surface portion. A header of a heat exchanger, characterized in that it is formed in an elongated shape formed with other flares protruding toward the surface. In the header of the heat exchanger according to any one of claims 1 to 3,
A header of a heat exchanger, wherein an adhesive portion into which a brazing material is injected during assembly is formed in a gap formed on the upper side of the curved surface due to the curved shape formed toward the inside of the cylindrical tube.   The header according to any one of claims 1 to 7 is attached to both sides of the tube by inserting the end of the tube constituting the heat exchanger into a slit hole provided in the header, and brazed to the tube. A heat exchanger characterized by that. A thick-walled cylindrical tube is used, and in the header of the heat exchanger, the cylindrical tube is formed in a direction perpendicular to the longitudinal direction, or in parallel with the longitudinal direction, or a plurality of slit holes formed linearly. A forming method comprising:
In the cylindrical tube, a flat portion and a die formed by punching to form a piece storage chamber are disposed in advance,
Next, a punch is press-fitted into the cylindrical tube in a direction perpendicular to the longitudinal direction toward the flat portion of the die, so that a part of the thick-walled cylindrical tube is punched out to be elongated and opened. Is formed, and the formed opening surface portion is plastically deformed toward the inside of the cylindrical tube, whereby a curved surface is formed toward the inside of the cylindrical tube on the opening entrance surface facing the width direction of the opening surface portion, and the opening exit The surface is formed with a protrusion whose tip opposite to the curved surface abuts against the flat portion of the die, and a wall portion having a facing configuration is formed between the curved surface and the protrusion, and protrudes outward from the cylindrical tube at both ends of the opening surface portion. An elongated first slit hole formed with a first flare is formed,
Another punch is press-fitted into the opening surface portion formed toward the flat portion of the die, and second flares projecting outward from the cylindrical tube are formed at both ends of the opening surface portion to form an elongated second Slit holes are formed,
The die is punched and pulled out of the cylindrical tube with a piece,
A method for producing a header of a heat exchanger characterized by the above.   A notch plate in which the tube of the heat exchanger is collectively inserted into the header of the heat exchanger according to claim 1 using the curved surface and the first flare formed on the header as a guide, and the inside of the cylindrical tube is separated into two. Is assembled using the second flare as a guide, and a method of assembling the header of the heat exchanger tube.

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