WO2011122388A1 - 熱交換器の製造方法 - Google Patents
熱交換器の製造方法 Download PDFInfo
- Publication number
- WO2011122388A1 WO2011122388A1 PCT/JP2011/056709 JP2011056709W WO2011122388A1 WO 2011122388 A1 WO2011122388 A1 WO 2011122388A1 JP 2011056709 W JP2011056709 W JP 2011056709W WO 2011122388 A1 WO2011122388 A1 WO 2011122388A1
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- WIPO (PCT)
- Prior art keywords
- tube
- plug
- expansion
- heat transfer
- fin
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
- B21D39/08—Tube expanders
- B21D39/20—Tube expanders with mandrels, e.g. expandable
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
- B21D53/08—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of both metal tubes and sheet metal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
- F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
- F28F1/32—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2275/00—Fastening; Joining
- F28F2275/12—Fastening; Joining by methods involving deformation of the elements
- F28F2275/125—Fastening; Joining by methods involving deformation of the elements by bringing elements together and expanding
Definitions
- the present invention relates to a method of manufacturing a heat exchanger provided in an air conditioner such as a refrigeration device or an air conditioner, and more particularly to a method of manufacturing a heat exchanger excellent in heat exchanging characteristics while preventing collapse of an internal fin due to expansion. Is.
- Heat transfer tubes for heat exchangers used in air conditioners, etc. have dramatically improved heat transfer performance in tubes compared to conventional smooth tubes, so there are many internally grooved tubes with many fine spiral grooves formed on the tube inner surface. in use.
- a grooved plug is held in a drawn smooth tube, and the outer periphery of the tube is pressed by a rolling tool so that the groove is transferred into the tube.
- a manufacturing method by a so-called rolling method is common.
- a number of fins made of, for example, an aluminum alloy in which holes for inserting the heat transfer tube are formed in advance are provided.
- the heat transfer tubes are arranged so as to overlap at a predetermined pitch along the length direction of the heat transfer tubes, the heat transfer tubes are inserted into the holes of the heat radiation fins, the tube expansion plugs are pushed into the heat transfer tubes, and the heat transfer tubes are expanded.
- the outer periphery of the heat transfer tube and the inner peripheral surface of the hole of the radiating fin are brought into close contact with each other.
- heat transfer tubes with excellent heat transfer performance have been used to improve the performance of heat exchangers.
- an internally grooved tube described in Patent Document 2 below is one of such heat transfer tubes.
- the internally grooved tube described in Patent Document 2 below is a separate tube in which internal fins are divided by sub-grooves and a plurality of fin components (internal protrusions) that are intermittently connected along the fin spiral direction are formed on the internal surface of the tube. This is called a grooved tube.
- the inner surface fin is divided by the sub-groove to form an independent inner surface protrusion. It aims at providing the manufacturing method of the heat exchanger which can expand a heat exchanger tube so that proper adhesiveness may be acquired.
- an inner fin that spirally protrudes from the inner surface of the tube is divided by a sub-groove, and a heat transfer tube in which a plurality of independent fin components are formed on the inner surface of the tube is passed through a through-hole of the radiating fin.
- a radius of curvature R1 along the outer peripheral shape in the tube axis direction is configured by an outer peripheral surface in a range of 8 mm ⁇ R1 ⁇ 20 mm, and the outer peripheral surface of the plug reduced diameter portion is a radius of curvature along the outer peripheral shape in the tube axis direction.
- R2 is in the range of R2 / R1 ⁇ 0.8
- Constituted by an outer peripheral surface of the inner can be a method for manufacturing a heat exchanger for re-tube expansion of the heat transfer tube with shrink-deformed after tube expansion by drawing from the interior of the heat transfer tube of the tube expansion plug.
- the expansion of the heat transfer tube is a heat exchanger manufacturing method that is performed by a shrink-less expansion method in which expansion is performed in a state where both sides in the tube axis direction are constrained.
- the said fin structure part is a structure provided with the protrusion piece which protrudes between the said inner surface fins from the fin helical direction downstream to the pipe-axis direction upstream at least. It can be set as the manufacturing method of a heat exchanger.
- the protruding piece is not an essential configuration, and the fin component may be configured not to include the protruding piece.
- the front side portion indicates a front side portion in the insertion direction of the tube expansion plug into the heat transfer tube
- the rear side indicates the rear side in the insertion direction of the tube expansion plug into the heat transfer tube.
- the heat radiation fin is preferably made of aluminum or an aluminum alloy. Further, the material of the heat transfer tube is not particularly limited as long as it is copper, a copper alloy, or other metal material having good heat conductivity.
- the shrinkage-less tube expansion method is a method of expanding a tube in a state where both ends of the tube are constrained in order to prevent contraction in the tube longitudinal direction due to tube expansion.
- the inner surface fin is divided by the sub-groove to form an independent inner surface protruding fin component, and the inner grooved tube called a so-called separate grooved tube is used as the heat transfer tube.
- the inner grooved tube called a so-called separate grooved tube is used as the heat transfer tube.
- Explanatory drawing of the manufacturing method of the heat exchanger of this embodiment Explanatory drawing of the pipe
- Action operation explanatory drawing of the manufacturing method of the heat exchanger of this embodiment.
- the heat exchanger manufacturing method of the present embodiment uses a heat transfer tube 1 in which a plurality of spiral inner fins 12 having a predetermined angle with respect to the tube axis direction D1 are formed on the inner surface of the tube. 3, the heat transfer tube 1 is expanded by pushing the tube expansion plug 2 into the heat transfer tube 1, and the heat radiating fins 3 (aluminum fins) and the heat transfer tube 1 are brought into close contact with each other.
- the inner surface fin 12 is divided by a spiral sub-groove 14 and a plurality of fin constituent portions 12A (inner surface protrusions) protruding from the tube inner surface 11 along the fin spiral direction D2. Forming.
- a projecting piece 16 projecting between the adjacent fins 12 on the upstream side D1u in the tube axis direction with respect to the fin component 12A at least on the fin spiral direction downstream side D2d of the fin component 12A.
- a first protruding piece 16a) to be described later is provided.
- the tube expansion plug 2 includes a plug expansion portion 2A having a large diameter from the front end 2F (front surface portion) toward the rear, and the outer peripheral surface of the plug expansion portion 2A is
- the radius of curvature R1 along the outer peripheral shape in the tube axis direction D1 is configured by an outer peripheral surface in a range of 8 mm ⁇ R1 ⁇ 20 mm.
- the heat transfer tube 1 used in the manufacturing method will be described in detail below.
- a plurality of fin constituent portions 12A in which the spiral inner fins 12 are divided by the auxiliary grooves 14 are formed on the inner surface 11 of the tube.
- the structure has a pipe inner surface 11 as shown in FIGS.
- FIG. 2 is a partially expanded perspective view schematically showing the state of the tube inner surface 11 of the heat transfer tube 1 of the present embodiment
- FIG. 3 is an enlarged plan view of the vicinity of the fin constituting portion 12A.
- FIG. 3 only the tops of the fin component 12 ⁇ / b> A and the protruding piece 16 are schematically shown.
- D1 in FIG. 2 indicates the pipe axis direction
- D2 indicates the fin spiral direction
- D3 indicates the sub-groove spiral direction
- u added to the end of the code indicating each direction indicates that it is upstream of the refrigerant flow in the pipe.
- d indicates the downstream side.
- the heat transfer tube 1 includes main grooves 13 between the inner surface fins 12 by forming spiral inner surface fins 12 on the tube inner surface 11.
- the plurality of fin constituent portions 12 ⁇ / b> A are continuously and independently connected along the fin spiral direction D ⁇ b> 2.
- fin structure parts are the structures provided with the protrusion piece 16 which protrudes in each of the upstream u and the downstream d of the sub-groove spiral direction D3 in each edge part of the upstream u and downstream d of the fin spiral direction D2.
- the protrusion piece 16 which protrudes in each of the upstream u and the downstream d of the sub-groove spiral direction D3 in each edge part of the upstream u and downstream d of the fin spiral direction D2.
- FIG. 3 when viewed in plan, it is formed in a shape in which the letter H is inclined (inclined H shape).
- the protruding piece 16 includes a first protruding piece 16a, a second protruding piece 16b, a third protruding piece 16c, and a fourth protruding piece 16d, all of which protrude toward the main groove 13 with respect to the fin component 12A. ing.
- the first projecting piece 16a is on the fin spiral portion downstream side D2d of the fin constituent portion 12A, and the main groove 13 between the fin constituent portion 12A and the inner fin 12 adjacent on the upstream side D1u in the tube axis direction. It protrudes toward the upstream side D3u in the auxiliary groove spiral direction.
- the second protruding piece 16b is on the downstream side D2d in the fin spiral direction of the fin component 12A, and the main groove 13 between the fin component 12A and the inner fin 12 adjacent on the downstream side D1d in the tube axis direction. Projecting toward the downstream side D3d in the sub-groove spiral direction.
- the third projecting piece 16c is the main groove between the fin component 12A and the inner fin 12 adjacent to the fin component 12A on the upstream side D1u in the tube axis direction on the upstream side D2u in the fin spiral direction. It protrudes toward the upstream side D3u in the sub groove spiral direction up to 13.
- the fourth projecting piece 16d is the main groove between the fin component 12A and the inner fin 12 adjacent to the fin component 12A on the downstream side D1d in the tube axis direction on the upstream side D2u in the fin spiral direction. 13 projects toward the downstream side D3d in the auxiliary groove spiral direction.
- a sub-groove 14 forming portion 15 is configured by a protruding piece 16 facing each other across the sub-groove 14 between the fin constituent portions 12A adjacent in the fin spiral direction D2.
- the orthogonal cross-sectional shape in the fin spiral direction D1 of the fin component 12A is formed in a substantially trapezoidal shape, and the sub-groove 14 is formed in an inverted triangular shape in the orthogonal cross-sectional shape in the sub-groove spiral direction D3.
- Hn in FIG. 2 indicates the average depth (Hn) of the sub-groove 14 between the upstream side D3u in the sub-groove spiral direction and the downstream side D3d in the sub-groove spiral direction.
- the fin width W refers to the fin width of the root portion of the fin constituent portion 12A (inner surface fin 12) in the cross section orthogonal to the fin spiral direction D2.
- the outer diameter of the heat transfer tube 1 is preferably 3 to 10 mm.
- Each inner fin 12 has a fin lead angle ⁇ 1 of 25 degrees or more because heat exchange performance improves as the fin lead angle ⁇ 1 increases. Manufacturing is more difficult as the fin lead angle ⁇ 1 is larger, so the fin lead angle ⁇ 1 is more preferably 30 to 60 degrees.
- the heat transfer tubes 1 having the above-described configuration are placed in the through holes 3H of the radiation fins 3 arranged at predetermined intervals in the tube axis direction D1.
- the outer diameter of the heat transfer tube 1 is pushed and expanded from the tube interior 11 by the tube expansion plug 2.
- the heat exchanger is manufactured by closely contacting the outer surface of the heat transfer tube 1 and the inner surface of the through hole 3H by expanding the heat transfer tube 1.
- the tube expansion plug 2 used for expanding the heat transfer tube 1 described above is attached to the tip of the support rod 2a.
- the base side of the support bar 2a is attached to a tube expansion device or the like (not shown).
- the pipe expansion plug 2 has a cross-sectional shape orthogonal to the pipe axis direction D1 (insertion / removal direction L) over the entire length of the tube axis direction D1, that is, the insertion / removal direction L to / from the heat transfer pipe 1. It is circular, and the front end portion 2F (front surface portion) and the rear end portion 2R (rear surface portion) are formed in a cylindrical shape facing each other in the tube axis direction D1.
- the front end portion 2F of the pipe expansion plug 2 has a circular shape having a diameter ( ⁇ d1) smaller than the inner diameter of the heat transfer pipe 1 before the pipe expansion.
- the pipe expansion plug 2 includes a plug expansion part 2A that gradually increases in diameter from the front end part 2F toward the rear.
- the plug diameter-expanded portion 2A increases in diameter until it reaches the maximum diameter portion 2M having the maximum diameter ⁇ d2 in the entire length in the tube axis direction D1.
- the outer peripheral surface of the plug enlarged diameter portion 2A is configured by an outer peripheral surface having a radius of curvature R1 along the outer peripheral shape in the tube axis direction D1 within a range of 8 mm ⁇ R1 ⁇ 20 mm.
- a plug reduced diameter portion 2B that gradually becomes smaller in diameter from the maximum diameter portion 2M to the rear end portion 2R is formed in the rear portion of the plug expanded diameter portion 2A in the tube expansion plug 2.
- the outer peripheral surface of the plug reduced diameter portion 2B is configured by an outer peripheral surface in which the radius of curvature R2 along the outer peripheral shape in the tube axis direction D1 is within the range of R2 ⁇ 0.8 ⁇ R1. Accordingly, the rear end portion 2R of the tube expansion plug 2 is formed with a diameter ( ⁇ d3) smaller than the diameter ⁇ d2 of the maximum diameter portion 2M.
- the radius of curvature R1 along the outer circumferential shape in the pipe axis direction D1 is set on the outer circumferential surface of the plug enlarged diameter portion 2A.
- the outer peripheral surface is in the range of 8 mm ⁇ R1 ⁇ 20 mm.
- the contact angle between the inner surface fin 12 and the tube expansion plug 2 becomes gentle, and the tube can be expanded while suppressing the inner surface fin collapse.
- the contact area between the inner surface fin 12 and the tube expansion plug 2 does not become too large, and an increase in tube expansion load due to frictional resistance (contact resistance) can be suppressed.
- the increase in the tube expansion load causes problems such as noise generation and distortion of the support bar 2a (core metal) when the tube expansion plug 2 is inserted into the heat transfer tube 1, but R1 should be 20 mm or less. Therefore, it is possible to prevent such a problem from occurring. Furthermore, it is possible to prevent the inner fin from collapsing by suppressing an increase in tube expansion load.
- a high-performance heat exchanger can be manufactured by obtaining sufficient adhesion with the radiating fins 3.
- smooth tube expansion can be realized, and manufacturing efficiency can be increased.
- the manufacturing method of the heat exchanger according to the present embodiment is effective particularly when the heat transfer tube 1 is expanded in the shrinkage-less tube expansion process.
- the contraction-less tube expansion is a method of expanding a tube in a state where both ends of the tube are constrained in order to prevent contraction in the tube longitudinal direction due to tube expansion.
- the heat transfer tube 1 is plug expanded.
- the diameter portion 2A is expanded to the same diameter ( ⁇ D2) as the maximum outer diameter ⁇ d2 of the tube expansion plug 2.
- the inner diameter ( ⁇ D4) of the heat transfer tube 1 may reach approximately the same diameter ( ⁇ D2) as the maximum outer diameter ⁇ d2 of the tube expansion plug 2 by reexpansion by pulling out the tube expansion plug 2, but after the tube expansion plug 2 is inserted, It can be made larger than the inner diameter ( ⁇ D3) of the heat transfer tube 1 that has undergone the reduced diameter deformation ( ⁇ D3 ⁇ D4 ⁇ D2).
- FIG. 5A is a partial cross-sectional view schematically showing a state where the pipe inner surface 11 is expanded by inserting the pipe expansion plug 2
- FIG. 5B is a diagram after the pipe expansion plug 2 is inserted
- FIG. 5C is a partial cross-sectional view schematically showing a state where the diameter of the pipe is slightly reduced
- FIG. 5C is a partial view schematically showing that the re-expansion is performed by pulling out the pipe expansion plug 2. It is sectional drawing.
- the insertion of the tube expansion plug 2 causes the inner surface fins 12 of the tube inner surface 11 after the insertion to be slightly inclined as shown in FIG.
- the slightly inclined inner fin 12 can be returned by the plug diameter-reducing portion 2B as shown in FIG. 6B when the tube expansion plug 2 is pulled out.
- 6A is an enlarged view of a region X in FIG. 5A, and is a schematic diagram showing a state in which the inner fin 12 is inclined by the insertion of the tube expansion plug 2.
- FIG. FIG. 6B is an enlarged view of the region Y in FIG. 5C, and is a schematic diagram showing a state in which the inner fin 12 inclined by pulling out the tube expansion plug 2 is restored.
- the heat transfer tube 1 used in the method for manufacturing a heat exchanger according to the present embodiment has a configuration in which at least the first projecting piece 16a is provided in the fin component 12A.
- test tubes 1 to 4 are a heat transfer tube referred to as a so-called separate grooved tube in which the inner fin 12 is divided by the sub-groove 14 and an independent fin component 12A (inner protrusion) is formed.
- Each of the tube expansion plugs 2 used in the experiments of Comparative Examples 1 to 8 includes the plug diameter-reduced portion 2B.
- the outer peripheral surface of the plug diameter-reduced portion 2B has a radius of curvature along the outer shape in the tube axis direction D1.
- R2 has an outer peripheral surface within the range of R2 ⁇ 1.0 ⁇ R1.
- the radius of curvature R2 along the outer peripheral shape in the tube axis direction D1 is R2 ⁇ 0.8 ⁇ R1 on the outer peripheral surface of the plug reduced diameter portion 2B. It has the outer peripheral surface which becomes in the range.
- the heat transfer tubes before and after the expansion were cut perpendicularly to the tube axis direction D1, filled with resin, polished, and the cross section was observed with an optical microscope to determine the internal fin collapse angle ⁇ after the expansion.
- apex of the inner fin 12 before pipe expansion by the line connecting the apex of the inner fin 12 before pipe expansion and the central portion in the width direction at the base of the fin 12 is expanded.
- An angle formed by a line connecting the moved tip and the central portion in the width direction at the base of the inner fin 12 is shown.
- the target is to expand at a tube expansion rate of 5.6% or more.
- the evaluation results are shown in Table 2.
- the tube expansion rate did not reach the target of 5.6% except for Comparative Example 3 among Comparative Examples 1 to 8.
- the tube expansion rate reached the target value, but the inner fin collapse angle ⁇ was 23 degrees, which was larger than the inner fin collapse determination reference value of 20 degrees. That is, none of the tube expansion methods of Comparative Examples 1 to 8 satisfied the reference value (target value) for both the tube expansion rate and the inner surface fin tilt angle.
- Examples 1 to 11 were all able to be expanded at a tube expansion rate of 5.6% or more.
- the heat exchanger tube can be obtained by the above-described heat exchanger manufacturing method so that the inner fin does not fall down and sufficient adhesion to the radiating fin 3 can be obtained even if a heat transfer tube called a so-called separate grooved tube is used. We were able to prove that we can expand the tube.
- the present invention is not limited to the above-described embodiments, and can be configured in various embodiments.
- the tube expansion plug used in the method for manufacturing a heat exchanger of the present invention is not limited to the tube expansion plug 2 of the above-described embodiment.
- the pipe expansion plugs 2P1 and 2P2 are arranged between the front end part 2F of the pipe expansion plugs 2P1 and 2P2 and the plug expansion part 2A.
- Plug front-side small diameter portions 2Ft and 2Fc having a smaller diameter than 2A may be provided.
- the plug front side small diameter portion 2Ft can be formed in a taper shape that tapers as the outer peripheral surface advances forward as shown in FIG. 7 (a).
- the plug front side small diameter portion 2Fc can be configured with a radius of curvature different from R1 in the radius of curvature R3 along the outer circumferential shape in the tube axis direction, as shown in FIG. 7B.
- the pipe expansion plugs 2P3 and 2P4 are arranged between the rear end portion 2R of the pipe expansion plugs 2P3 and 2P4 and the plug diameter reduction portion 2B.
- plug rear side small diameter portions 2Rt and 2Rc having a smaller diameter may be provided.
- the outer peripheral surface of the plug rear side small diameter portion 2Rt can be formed in a tapered shape as shown in FIG.
- the plug rear-side small-diameter portion 2Rc can be configured such that the radius of curvature R3 along the outer circumferential shape in the tube axis direction is different from that of R2, as shown in FIG. .
- the pipe expansion plug 2P5 includes a plug expanded diameter portion 2A having two plug expanded diameter sections 2A, which are a plug front expanded diameter section 2A1 and a plug rear expanded diameter section 2A2. Can be configured.
- the outer peripheral surface of the plug front-side enlarged portion 2A1 and the outer peripheral surface of the plug rear-side enlarged portion 2A2 have different radii of curvature R1a and R1b along the outer peripheral shape in the tube axis direction LL, but both are 8 mm ⁇ R1 ⁇ 20 mm.
- the outer peripheral surface is within the range.
- the tube expansion plug 2P6 includes a plug reduced diameter portion 2B having two plug reduced diameter portions, which are a plug rear reduced diameter portion 2B1 and a plug rear reduced diameter portion 2B2. Can be configured.
- the outer peripheral surface of the plug rear-side reduced diameter portion 2B1 and the outer peripheral surface of the plug rear-side reduced diameter portion 2B2 have different radii of curvature R2a and R2b along the outer peripheral shape in the tube axis direction L, but both R2 / R1 ⁇ 0
- the outer peripheral surface is in the range of .8.
- the pipe expansion plug 2P7 is configured such that the maximum diameter part 2M between the plug enlarged diameter part 2A and the plug reduced diameter part 2B has the same diameter while maintaining the maximum diameter ⁇ d2 in the pipe axis direction L.
- the structure provided with the small torso part 2T may be sufficient.
- the outer peripheral surface of the plug diameter-reducing portion 2B that re-expands the heat transfer pipe 1 that has contacted the inner surface fins 12 and reduced in diameter after the pipe expansion when the plug is pulled out of the pipe is an outer peripheral shape in the tube axis direction L.
- the radius of curvature R2 along the line is in the range of R2 / R1 ⁇ 0.8, it can be configured in various embodiments.
- the protruding piece corresponds to the first protruding piece 16a.
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Abstract
Description
本実施形態の熱交換器の製造方法は、図1に示すように、管軸方向D1に対して所定角の螺旋状の内面フィン12が管内面に複数形成された伝熱管1を、放熱フィン3に通し、該伝熱管1の内部に拡管プラグ2を押し込むことにより該伝熱管1を拡管して前記放熱フィン3(アルミフィン)と前記伝熱管1を密着させる方法である。
なお、フィン幅Wとは、フィン螺旋方向D2の直交断面におけるフィン構成部12A(内面フィン12)の根元部分のフィン幅のことをいう。
熱交換器の製造方法では、伝熱管1の拡管に用いる拡管プラグ2において、上述したように、前記プラグ拡径部2Aの外周面を、管軸方向D1の外周形状に沿った曲率半径R1が8mm≦R1≦20mmの範囲内となる外周面で構成している。
加えて、スムーズな拡管を実現することができ、製造効率も高めることができる。
ここで、縮みレス拡管とは、拡管による管長手方向の縮みを防ぐため、管の両端を拘束した状態で拡管する方法である。
すなわち、拡管プラグ2の引き抜きによる再拡管により伝熱管1の内径(φD4)は、拡管プラグ2の最大外径φd2と略同径(φD2)にまで達するかもしれないが、拡管プラグ2の挿入後に縮径変形した伝熱管1の内径(φD3)よりも大きくすることができる(φD3<φD4<φD2)。
なお、図6(a)は、図5(a)中の領域Xの拡大図であり、拡管プラグ2の挿入により内面フィン12が傾く様子を示す模式図である。図6(b)は、図5(c)中の領域Yの拡大図であり、拡管プラグ2の引抜により傾いた内面フィン12が復帰した様子を示す模式図である。
なお、角度θは、図6(c)に示すように拡管前の内面フィン12の頂点とフィン12の根元の幅方向中央部とを結んだ線と拡管により拡管前の内面フィン12の頂点が移動した先と内面フィン12の根元の幅方向中央部とを結んだ線の成す角度を示す。
例えば、本発明の熱交換器の製造方法に用いる拡管プラグは、上述した実施形態の拡管プラグ2に限定しない。
2,2P1,2P2,2P3,2P4,2P5,2P6,2P7…拡管プラグ
2A…プラグ拡径部
2B…プラグ縮径部
3…放熱フィン
11…管内面
12…内面フィン
12A…フィン構成部
14…副溝
16…突出片
D1…管軸方向
D2…フィン螺旋方向
Claims (3)
- 管内面から螺旋状に突出する内面フィンが副溝により分断され、独立した複数のフィン構成部を管内面に形成した伝熱管を、放熱フィンの貫通孔に通し、前記伝熱管の内部に拡管プラグを押し込むことにより前記伝熱管を拡管して前記放熱フィンと前記伝熱管を密着させる熱交換器の製造方法であって、
前記拡管プラグに、該拡管プラグの前側部分から後方へ向けて大径となるプラグ拡径部を構成するとともに、該プラグ拡径部よりも後方側に、後方へ向けて小径となるプラグ縮径部を構成し、
前記プラグ拡径部の外周面を、管軸方向の外周形状に沿った曲率半径R1が8mm≦R1≦20mmの範囲内となる外周面で構成し、
前記プラグ縮径部の外周面を、管軸方向の外周形状に沿った曲率半径R2がR2/R1≦0.8の範囲内となる外周面で構成し、
前記拡管プラグの前記伝熱管の内部からの引き抜きにより拡管後に縮径変形した前記伝熱管を再拡管する
熱交換器の製造方法。 - 前記伝熱管の拡管は、管軸方向の両側を拘束した状態で拡管する縮みレス拡管方法により行う
請求項1に記載の熱交換器の製造方法。 - 前記フィン構成部は、該フィン構成部の少なくともフィン螺旋方向下流側から管軸方向上流側で、隣り合う前記内面フィンとの間に突出する突出片を備えた構成である
請求項1又は2に記載の熱交換器の製造方法。
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CN103357768A (zh) * | 2012-04-09 | 2013-10-23 | 南通海利源船舶设备工程有限公司 | 一种改进型拉胀头 |
JP6238063B2 (ja) * | 2013-12-27 | 2017-11-29 | 三菱アルミニウム株式会社 | 拡管プラグ |
JP6521424B2 (ja) * | 2014-11-10 | 2019-05-29 | 三菱アルミニウム株式会社 | 拡管プラグおよび拡管プラグの設計方法 |
JP6233540B2 (ja) * | 2016-04-20 | 2017-11-22 | ダイキン工業株式会社 | 熱交換器及び空調機 |
CN217303714U (zh) | 2021-03-01 | 2022-08-26 | 海德鲁挤压解决方案股份有限公司 | 在热交换器中安装可膨胀管的系统、可膨胀管和膨胀弹头 |
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JPH10166088A (ja) * | 1996-12-12 | 1998-06-23 | Mitsubishi Heavy Ind Ltd | プレートフィンチューブ型熱交換器 |
JP2001212634A (ja) * | 2000-02-03 | 2001-08-07 | Daikin Ind Ltd | クロスフィンコイルの拡管方法 |
JP2006130558A (ja) * | 2004-10-04 | 2006-05-25 | Furukawa Electric Co Ltd:The | 熱交換器の製造方法 |
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