JP6502912B2 - Method and apparatus for manufacturing fin-incorporated tube - Google Patents

Description

  The present invention relates to a method and an apparatus for manufacturing a fin-incorporated pipe in which a spiral fin is interposed inside the pipe.

  Patent Document 1 discloses a heat exchange pipe provided with a spiral thin plate inside the pipe.

  At the time of manufacturing the heat exchange pipe, first, a thin plate is formed in a spiral shape. Then, a thin spiral plate is inserted into the pipe.

JP, 2006-98038, A

  At the time of manufacturing the heat exchange pipe, bending may be performed to bend the heat exchange pipe.

  However, when the heat exchange pipe is bent, since the thin spiral plate is inserted into the pipe, the cored bar can not be inserted into the pipe. For this reason, when it is going to bend a heat exchange pipe, there exists a possibility that molding defects, such as a wrinkle, may generate | occur | produce in the bending part which curves.

  The present invention has been made in view of the above-mentioned problems, and an object thereof is to suppress a molding defect of a bent portion of a fin-incorporated pipe.

According to an embodiment of the present invention, there is provided a method of manufacturing a fin-embedded tube, wherein a fin is interposed inside the tube , wherein a plate-like fin material is inserted into the inside of the tube, and a part of the fin material is The tube is fixed to the tube, the tube and the core metal supporting the fin are relatively rotated, and the core metal twists the fin material to form the fin in a spiral shape, and the core metal is inserted into the tube. There is provided a method of manufacturing a fin-embedded tube characterized by inserting and bending the tube.

Further, according to another aspect of the present invention, there is provided an apparatus for manufacturing a fin-incorporated pipe in which a fin is interposed inside the pipe, the cored bar supporting the fin, and a part inserted into the inside of the pipe. A driving mechanism for relatively rotating the pipe and the core in such a manner that the core metal twists the plate-like fin material fixed to the pipe so that the fin is formed into a spiral; the fin and the core A manufacturing apparatus for a finned tube is provided, comprising: a bending machine which inserts gold into the inside of the tube to bend the tube.

  According to the above aspect, in the fin-incorporated pipe, the cored bar supporting the fin during bending is interposed inside the pipe. Since the fin-incorporated tube is formed in contact with the relatively rotating core metal on the inner surface of the tube, the occurrence of forming defects such as wrinkles in the bent portion of the tube can be suppressed. Therefore, the fin built-in pipe can suppress the molding failure of the bending portion.

FIG. 1 is a cross-sectional view showing a double pipe according to an embodiment of the present invention. FIG. 2 is a perspective view showing a manufacturing apparatus of a fin-incorporated tube. FIG. 3 is a plan view showing a core metal. FIG. 4 is a perspective view showing a process of manufacturing the fin-incorporated tube. FIG. 5 is a perspective view showing a process of manufacturing the fin-incorporated tube. FIG. 6 is a perspective view showing a process of manufacturing the fin-incorporated tube. FIG. 7 is a cross-sectional view showing the process of manufacturing the fin-incorporated tube. FIG. 8 is an enlarged cross-sectional view of a portion of FIG.

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

  FIG. 1 is a cross-sectional view showing a double pipe 40 to which a fin-incorporated pipe 30 (heat exchange tube) according to the present embodiment is applied. The double pipe 40 is provided as a heat exchanger through which refrigerant (fluid) of an air conditioner (not shown) circulates.

  The double pipe 40 includes a cylindrical inner pipe 20 forming an inner flow passage 51 therein, and a cylindrical outer pipe 32 forming an outer flow passage 52 around the inner pipe 20. Piping (not shown) for leading the refrigerant is connected to both ends of the inner pipe 20. Both end portions 36, 37 of the outer pipe 32 are joined to the outer periphery of the inner pipe 20. The outer pipe 32 has an inlet 38 and an outlet 39 to which piping (not shown) for leading the refrigerant is connected.

  A high temperature and high pressure liquid refrigerant flows through the inlet 38 and the outlet 39 in the outer flow passage 52 as shown by arrows A and B in the figure. In the inner flow passage 51, as indicated by arrows C and D in the drawing, a low temperature and low pressure gaseous refrigerant flows. In the double pipe 40, the refrigerant flowing through the outer flow passage 52 and the inner flow passage 51 exchanges heat.

  Inside the inner tube 20, a spiral fin 10 is interposed. The spiral fin 10 is formed by twisting the band plate-like fin material 11 in a spiral shape as described later. Both end portions 11A and 11B of the fin material 11 are fixed to the inner surface 21 of the inner pipe 20, for example, by caulking.

  Each member 32, 20, 10 which comprises the double pipe | tube 40 makes metal, such as aluminum, for example, a material.

  The inner pipe 20 and the spiral fin 10 constitute a fin-incorporated pipe 30 as an element of a heat exchanger. In the fin-incorporated pipe 30, the refrigerant flowing through the inner flow passage 51 circulates while spirally swirling along the spiral fin 10, thereby promoting heat exchange of the refrigerant through the inner pipe 20.

  The double tube 40 has a curved portion 44 curved in the middle corresponding to the space to be installed. The inner pipe 20 has a bending portion 24 constituting the bending portion 44 and straight pipe portions 23, 25 extending linearly from the bending portion 24. The outer tube 32 has a bending portion 34 constituting the bending portion 44 and straight pipe portions 33 and 35 extending linearly from the bending portion 34.

  Next, with reference to FIG. 2, the manufacturing apparatus 50 of the fin built-in pipe | tube 30 is demonstrated.

  The manufacturing apparatus 50 includes a core metal 60 inserted inside the inner pipe 20, a chuck 70 for gripping the outer periphery of the inner pipe 20, and a bending machine slidably supporting the outer periphery of the inner pipe 20 and bending it. And 80.

  The manufacturing apparatus 50 includes a drive mechanism 65 for driving the cored bar 60 and a drive mechanism 75 for driving the chuck 70. The drive mechanism 65 rotationally drives the cored bar 60 around the axis O of the inner pipe 20 as indicated by the arrow E, and moves the cored bar 60 in the direction of the axis O as indicated by the arrow F. The drive mechanism 75 moves the chuck 70 in the direction of the axis O as indicated by the arrow H. The operations of the drive mechanisms 65 and 75 and the bending machine 80 are controlled by a controller (not shown).

  The bending machine 80 includes a roll die 81, a pressure die 82, and a clamp die 83. The roll die 81 has a forming groove 81A extending in an arc shape centering on the bending central axis S. The pressure mold 82 has a guide groove 82A extending in the axial O direction. The inner pipe 20 is slidably supported between the forming groove 81A and the guide groove 82A, and is guided to move in the axial O direction. The clamp mold 83 has a clamp groove (not shown) for gripping the outer periphery of the inner pipe 20.

  At the time of bending, the roll die 81 and the clamp die 83 rotate around the bending central axis S by a drive mechanism (not shown) in a state where the inner pipe 20 is gripped between them. Thereby, the inner pipe 20 fed by the drive mechanism 75 is bent along the forming groove 81A.

  The cored bar 60 has a columnar base end 62, a support 63, and a tip 64 extending in the direction of the axis O, and a slit 61 opening over the support 63 and the tip 64.

  The base end portion 62 of the cored bar 60 is a portion connected to the drive mechanism 65.

  The support portion 63 of the cored bar 60 is a portion that supports the distal end portion 64 with respect to the proximal end portion 62. The support portion 63 is formed to be smaller in diameter than the proximal end portion 62 and the distal end portion 64, and extends in the axial direction O with a gap on the inner surface 21 of the inner tube 20. Thereby, the sliding resistance of the core metal 60 can be suppressed small.

  As shown in FIG. 3, the tip end portion 64 includes a die portion 64A in sliding contact with the inner surface 21 of the inner tube 20, a die tip end portion 64B extending from the die portion 64A in the direction of the axis O gradually And a portion 64C.

  The mold portion 64A is formed in a cylindrical shape. The outer peripheral surface of the mold portion 64A faces the inner surface 21 of the inner pipe 20 with a gap. As described later, the mold portion 64A abuts against the inner surface 21 of the inner pipe 20 in the vicinity of the bending portion 24 while being relatively rotated at the time of bending, so that the bending portion 24 is formed.

  The mold tip portion 64B is formed in a spindle shape whose diameter is reduced without any step from the mold portion 64A. The outer peripheral surface of the mold tip portion 64B extends in a curved shape without bending from the outer peripheral surface of the mold portion 64A. As will be described later, the mold tip portion 64B abuts against the inner surface 21 of the bending portion 24 while being relatively rotated at the time of bending, so that the bending portion 24 is formed.

  The end clearance portion 64C is further reduced in diameter and protrudes from the mold end portion 64B. The tip clearance portion 64C is configured not to interfere with the inner surface 21 of the bending portion 24 at the time of bending, as described later.

  The slit 61 is a gap having a constant opening width and extending in the direction of the axis O, and forms a support wall portion for supporting the fin material 11 accommodated in the core metal 60. The opening end portion 61A of the slit 61 gradually increases in opening width and opens to the tip clearance portion 64C.

  Next, a method of manufacturing the fin-incorporated tube 30 using the manufacturing apparatus 50 will be described.

  First, as shown by the arrow G in FIG. 2, the fin material 11 is inserted into the inner pipe 20. Then, the tip end portion 11A of the fin material 11 is fixed to the inner pipe 20 by caulking the outer periphery of the inner pipe 20.

  In addition, it is good also as a structure which pressingly injects the front-end | tip part 11A of the fin material 11 into the inner surface 21 of the inner pipe | tube 20, and fixes to the inner pipe | tube 20, for example.

  Subsequently, as shown in FIG. 4, the cored bar 60 is inserted into the inner pipe 20. At this time, the fin material 11 is inserted into the slit 61 of the core metal 60.

  Subsequently, as shown by the arrow H in FIGS. 5 and 6, the inner pipe 20 is moved in the direction of the axis O with respect to the metal core 60, and as shown by the arrow E in FIGS. The tube 20 is rotated in one direction.

  Thereby, the fin material 11 which comes out of the slit 61 of the metal core 60 is twisted with the tip end portion 11A as a fulcrum. Thus, the spiral fin 10 is formed inside the straight pipe portion 25 of the inner pipe 20.

  Subsequently, as shown in FIGS. 7 and 8, the bending machine 80 is operated to bend the inner pipe 20. At this time, the roll mold 81 and the clamp mold 83 rotate around the bending central axis S as shown by the arrow I in a state in which the inner pipe 20 is gripped. As a result, the inner pipe 20 fed by the drive mechanism 75 as shown by the arrow H is bent along the arc-shaped formed groove 81A.

  At the time of the above-mentioned bending processing, the bending processing portion 24 is formed by the outer periphery of the tip portion 64 of the core metal 60 coming into contact with the inner surface 21 of the inner pipe 20.

  At the time of the above-mentioned bending process, a compressive stress is generated in the curved inner portion 24A located inside the bending portion 24, but buckling occurs when the cylindrical mold portion 64A abuts on the inner surface 21 of the inner pipe 20 in the vicinity thereof. Can be suppressed. As a result, as shown by a two-dot chain line in FIG. 8, the occurrence of molding defects such as wrinkles 24C can be suppressed in the curved inner portion 24A.

  During the bending process, a tensile stress is generated in the curved outer portion 24B located on the outer side of the bending portion 24. However, the spindle-shaped mold tip 64B relatively rotates and abuts on the inner surface 21 thereof to form an arc shape thereof. Cross-sectional shape is maintained. Thus, in the curved outer portion 24B, as shown by a two-dot chain line in FIG. 8, the formation of the portion 24D whose cross-sectional shape is excessively flattened can be suppressed.

  The controller rotates the core 60 by the drive mechanism 65 as indicated by the arrow E with respect to the moving speed of the inner pipe 20 in the direction of the axis O by the drive mechanism 75 as indicated by the arrow H during the bending process. Control to lower the Thus, the spiral fin 10 is formed such that the length (helical pitch) in the direction of the axis O in which the fin material 11 is twisted by a certain angle with respect to the axis O is larger in the bending portion 24 than in the straight pipe portions 23 and 25 Ru. Thereby, in the bending portion 24, the change in the bending rigidity of the spiral fin 10 is suppressed to a small degree according to the angle of the fin material 11 disposed in the inside thereof. Therefore, the shaping | molding precision of the bending part 24 can be raised.

  After the bending process is performed, the bending machine 80 moves the clamp mold 83 holding the inner tube 20 to the retracted position. Then, the inner pipe 20 is moved in the direction of the axis O with respect to the cored bar 60 and the cored bar 60 is rotated to form the spiral fin 10 inside the straight pipe portion 23 of the inner pipe 20.

  Then, the base end portion 11B of the fin material 11 is fixed to the inner pipe 20 by caulking the outer periphery of the inner pipe 20.

  Thus, the fin-incorporated tube 30 is manufactured. Thereafter, the outer pipe 32 having the divided structure is assembled to the fin-incorporated pipe 30 and joined to the inner pipe 20, whereby the double pipe 40 is manufactured.

  In addition, it is good also as a structure which manufactures the fin built-in pipe | tube 30 using the manufacturing apparatus 50 after joining the outer pipe | tube 32 to the inner pipe | tube 20 not only in above-described structure. In this case, the manufacturing apparatus 50 uses the bending machine 80 to bend the inner pipe 20 and the outer pipe 32 together.

  Next, the effects of the present embodiment will be described.

  According to the present embodiment, by inserting the core metal 60 supporting the helical fins 10 (fins) into the inside of the inner tube 20 (tube) and bending the inner tube 20, the helical fins 10 can be embedded inside the inner tube 20. It is possible to provide a method of manufacturing the fin-incorporated tube 30 to be interposed.

  Further, according to the present embodiment, the cored bar 60 supporting the spiral fin 10 and the bending machine 80 which inserts the fin and the cored bar 60 into the inner pipe 20 and bends the inner pipe 20 are provided. Thereby, the manufacturing apparatus 50 of the fin built-in pipe | tube 30 which interposes the spiral fin 10 in the inside of the inner pipe | tube 20 can be provided.

  In the manufacturing method and the manufacturing apparatus 50 of the fin-incorporated pipe 30, in the fin-incorporated pipe 30, the core metal 60 for supporting the fin at the time of bending is interposed inside the inner pipe 20. Since the fin-incorporated tube 30 is formed in contact with the core metal 60 on which the inner surface 21 of the inner tube 20 relatively rotates, the occurrence of forming defects such as wrinkles 24C in the bent portion 24 of the inner tube 20 is suppressed. Be Therefore, the fin built-in pipe | tube 30 can suppress the shaping | molding defect of the bending process part 24. FIG.

  Further, according to the present embodiment, the plate-like fin member 11 is inserted into the inner pipe 20, and the tip portion 11A (a part) of the fin member 11 is fixed to the inner pipe 20. The manufacturing method for manufacturing the fin-embedded tube 30 can be provided by rotating the core material 60 in a spiral shape by rotating the core material 60 by rotating the core material 60 relative to 60.

  As a result, in the fin-incorporated tube 30, the spiral fin 10 is helically formed inside the inner tube 20 by rotating the core metal 60. For this reason, when manufacturing the fin-incorporated tube 30, the step of inserting the helically shaped spiral fin 10 into the inner tube 20 is eliminated. Therefore, the assemblability of the fin built-in tube 30 can be improved.

  The spiral fin 10 can be interposed at a predetermined position of the inner pipe 20 with reference to the tip end 11A of the fin material 11 fixed to the inner pipe 20.

  In addition, the site | part which fixes the fin material 11 to the inner tube | pipe 20 may be a site | part of the middle of the fin material 11, not only the front-end | tip part 11A.

  Further, according to the present embodiment, the cored bar 60 has the slit 61 for accommodating the fin material 11, and the cored bar 60 is moved relative to the inner pipe 20 in the axis O direction while rotating the cored bar 60 with respect to the inner pipe 20. Thus, the fin-containing tube 30 can be manufactured by twisting the fin material 11 coming out of the slit 61.

  As a result, the controller changes the moving speed at which the core metal 60 is moved in the direction of the axis O of the inner pipe 20 by the drive mechanism 75 and the rotational speed at which the core metal 60 is rotated. Can twist the fin material 11. Therefore, the fin built-in tube 30 can set the twisting position of the fin material 11 with respect to the inner tube 20 arbitrarily.

  Further, according to the present embodiment, the cored bar 60 has the mold portion 64A in contact with the inner surface 21 of the inner pipe 20 before being subjected to bending processing, and the bent portion 24 of the inner pipe 20 having a diameter reduced from the mold portion 64A. The method for manufacturing the fin-incorporated tube 30 can be provided by having the mold tip portion 64B that protrudes so as to face the inside thereof.

  Thus, in the bending portion 24 of the inner pipe 20, the mold portion 64A of the relatively rotating core metal 60 abuts against the inner surface 21 of the inner pipe 20 before being bent, whereby the curved inner side is compressed by bending. It is possible to suppress the occurrence of molding defects such as wrinkles 24C in the portion 24A. Then, in the bending portion 24, the curved outer portion 24B pulled by bending contacts the mold tip portion 64B of the relatively rotating cored bar 60, thereby suppressing flattening. Thus, the fin built-in tube 30 can suppress the molding failure of the bending portion 24.

  As mentioned above, although the embodiment of the present invention was described, the above-mentioned embodiment showed only a part of application example of the present invention, and in the meaning of limiting the technical scope of the present invention to the concrete composition of the above-mentioned embodiment. Absent.

  For example, in the above embodiment, the manufacturing device 50 is configured to insert the core metal 60 into the inside of the inner pipe 20 and rotate the core metal 60. Not limited to this, the manufacturing device 50 may be configured to interpose the fin material 11 inside the inner pipe 20 via the core metal 60 without rotating the core metal 60. In this case, the fin-incorporated tube 30 has flat fins in the inner tube 20.

  Although the fin built-in tube 30 of the said embodiment is suitable as a heat exchange tube which comprises a heat exchanger, it is applicable also to the machine or equipment used other than a heat exchanger.

10 Spiral fin (fin)
11 fin material 11A tip 20 inner pipe (tube)
Reference Signs List 21 inner surface 24 bending portion 30 tube with a fin 60 metal core 61 slit 64A type portion 64B type tip portion 80 bending processing machine

Claims (4)

A method of manufacturing a fin-incorporated pipe, in which a fin is interposed inside the pipe,
Insert a plate-like fin material into the inside of the tube,
Securing a portion of the fin material to the tube;
The pipe and a core metal supporting the fin are relatively rotated, and the core metal twists the fin material to form the fin in a spiral shape.
Method of manufacturing a fin internal tube, characterized in that bending the tube by inserting the core metal into the interior of the tube. It is a manufacturing method of the fin built-in pipe according to claim 1 ,
The cored bar has a slit for accommodating the fin material,
A method for manufacturing a fin-containing tube, comprising: relatively moving the core in the axial direction of the tube while rotating the core relative to the tube; and twisting the fin material coming out of the slit. A method of manufacturing a fin-incorporated tube according to claim 2 , wherein
The core bar is
A mold portion that abuts the inner surface of the pipe before being bent;
A mold tip portion which is contracted from the mold portion and protrudes inside the bent portion of the pipe;
A method of manufacturing a fin-embedded tube, comprising: A manufacturing apparatus for a fin-incorporated pipe, in which fins are interposed inside the pipe,
A core metal supporting the fins;
The core metal twists the plate-like fin material inserted into the inside of the pipe and partially fixed to the pipe, and the pipe and the core metal relatively rotate so that the fin is formed into a helical shape. Driving mechanism, and
And a bending machine for inserting the fins and the core metal into the inside of the pipe to bend the pipe.

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