JP2007326142A - Method and apparatus for forming dimpled tube for heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To change a heat transfer rate by changing the intervals between dimples without bringing about the defective forming of the dimples and complication of structure while using the same dimple forming rollers. <P>SOLUTION: After forming the dimples to a conveyed tube material 1 with dimple forming rollers (a recess forming roller 9, a projection forming roller 11), the tube material is made into a tubular shape by bending both sides in the width direction toward the center side with bending roller group 13, butting both the end parts each other and forming a space which becomes a flow passage in which a heat exchanging medium flows in the bent inside and successively it is cut into a prescribed length with cutting edges 15, 17. The rotational speed of the dimple forming rollers is changed on the basis of the moving speed of the tube material 1 which is measured with an encoder 19. At this time, the dimple forming rollers, the respective outer peripheral surfaces 9a, 11a of which are separated from the surface of the tube material 1, are rotated in synchronism with the moving speed of the tube material 1 by bringing recessed parts 9b and projecting parts 11b into contact with tube material 1 only when forming the dimples. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method and apparatus for forming a dimple tube for a heat exchanger that forms dimples on a band-shaped member by moving the band-shaped member between a rotating concave molding roller and a convex molding roller.

A heat exchanger used in an air conditioner such as an automobile is known to exchange heat by flowing a heat exchange medium in a tube. At this time, dimples are formed on the inner surface of the tube through which the heat exchange medium flows. The heat exchange area is enlarged to increase the heat transfer coefficient (see, for example, Patent Document 1 below).
JP 2004-205111 A

  By the way, when forming the dimple as described above, when the belt-shaped member is moved between the concave molding roller that is a dimple molding roller and the convex molding roller, both the rollers are synchronized with the movement of the belt-shaped member. Since the rotation speed is constant, the distance between the dimples in the direction of movement of the strip-shaped member is constant, making it difficult to change the heat transfer coefficient.

  Here, in order to change the interval of the dimples in the moving direction of the belt-like member, it is possible to replace the dimple forming roller with another one, but in this case, workability is deteriorated.

  In order to change the distance of the dimple strip moving direction without changing the dimple forming roller, it is possible to change the rotation of the dimple forming roller, but if the rotation is simply changed, the dimple Since the molding roller is always in contact with the belt-like member, dimple molding defects such as thinning occur due to the relative speed difference between the rotationally changed dimple molding roller and the belt-like member.

  Further, as described in Patent Document 1, it is possible to change the distance of the dimples in the moving direction of the dimples without replacing the dimple forming rollers by separating the dimple forming rollers from the band members. However, in this case, a mechanism for moving the dimple forming roller is required, and the structure becomes complicated.

  Accordingly, an object of the present invention is to enable the dimple spacing to be changed while using the same dimple forming roller without incurring dimple forming defects or complicated structures.

  According to the present invention, on one side of the belt-like member, a concave forming roller having a concave portion on the outer peripheral surface is disposed on the other side, and a convex molding roller having a convex portion on the outer peripheral surface is rotatably disposed, In the method for forming a dimple tube for a heat exchanger, the dimple tube for heat exchanger forms a dimple between the concave portion and the convex portion while moving the belt-shaped member between the concave molding roller and the convex molding roller. The roller and the convex molding roller are arranged so that the outer peripheral surface thereof is separated from the surface of the band-shaped member, and the concave molding roller and the convex molding roller are respectively rotated along with the movement of the band-shaped member, The dimple is formed on the belt-shaped member between the concave portion and the convex portion, and after the dimple molding, the concave portion and the convex portion formed with the dimple are formed by the concave molding roller and the convex molding roller. After separating from the belt-shaped member by rolling, the concave molding roller, the convex molding roller, and the belt-shaped member are relatively positioned with the outer peripheral surfaces of the concave molding roller and the convex molding roller being separated from the surface of the belt-shaped member. The main feature is to change the moving speed.

  According to the present invention, after forming the dimples, the concave portions and the convex portions are separated from the belt-shaped member by the rotation of the concave molding roller and the convex molding roller, and then the outer peripheral surfaces of the concave molding roller and the convex molding roller are the surfaces of the belt-shaped member. Since the relative moving speed of the concave forming roller and the convex forming roller and the belt-like member is changed in a state away from the above, the same dimple forming roller is used, resulting in dimple forming defects and a complicated structure. In addition, the dimple spacing can be changed.

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

  FIG. 1 is a simplified side view showing a dimple tube forming apparatus for a heat exchanger according to an embodiment of the present invention. This forming apparatus manufactures a tube with dimples used for a heat exchanger in an automobile or the like, and a tube material 1 as a band-shaped member which is a material of the tube is supplied from a member supply source (not shown) in FIG. It is sent out in the direction indicated by A.

  The above-described dimple tube forming apparatus for heat exchanger includes a dimple forming portion 3, a tube forming portion 5, and a tube cutting portion 7 along the moving direction A of the tube material 1.

  As will be described in detail later, the dimple forming portion 3 presses the tube material 1 from both sides by a concave forming roller 9 and a convex forming roller 11 which are a pair of dimple forming rollers, and forms dimples on the tube material 1.

  The tube forming part 5 is a flow path in which both sides in the width direction of the tube material 1 formed with dimples are gradually bent toward the center side by a bending roller group 13 so that both ends are brought into contact with each other, and the heat exchange medium flows inside the bent side. A space to be formed is formed into a tube shape. FIG. 2 shows a perspective view of the tube material 1 formed into a tube shape by gradually bending the both side portions 1a and 1b inward as indicated by an arrow B after the dimple molding.

  The cutting part 7 cuts the tube material 1 formed in a tube shape into a predetermined length by a pair of cutting blades 15 and 17.

  An encoder 19 as a moving speed measuring means for measuring the moving speed of the tube material 1 is provided on the upstream side of the dimple forming roller, and a length of the tube after cutting is measured on the upstream side of the cutting portion 7. Each encoder 21 is installed.

  The measurement signals of these encoders 19 and 21 are received by a controller 23 including a rotation speed variable control means, and the rotation speed of the dimple forming roller is changed based on the moving speed of the tube material 1 measured by the encoder 19, and the encoder 21 measures the measurement signal. The cutting blades 15 and 17 are operated based on the length of the tube material 1 to be performed.

  Next, the dimple forming roller will be described. FIG. 3 is a simplified perspective view of the dimple forming roller, and FIG. 4 is a side sectional view of the dimple forming roller. Here, the concave forming roller 9 positioned at the upper portion of the tube material 1 has a plurality of concave portions 9b on the outer peripheral surface 9a, and the convex forming roller 11 positioned at the lower portion has a convex portion 11b corresponding to the concave portion 9b described above. A plurality of outer peripheral surfaces 11a are provided.

  A plurality of the concave portions 9b and the convex portions 11b are provided in the axial direction of each of the rollers 9 and 11, and a plurality of the concave portions 9b and the convex portions 11b are also provided at intervals in the circumferential direction, and the tube material 1 is provided between the concave portions 9b and the convex portions 11b. To form a dimple.

  Moreover, as shown in FIG. 4, the concave molding roller 9 and the convex molding roller 11 are rotatably supported at positions where the outer peripheral surfaces 9a and 11a are separated from the tube material 1. As a drive source, a servo motor or the like whose rotation speed can be easily changed is used.

  FIG. 5 is a more accurate cross-sectional view of each of the dimple forming rollers described above, corresponding to the cross section taken along the line CC of FIG. 1, and a pair of rotary shaft support brackets 25 and 27 provided on the base 13 are connected to a rotary shaft 29, 31 is rotatably supported, and the concave forming roller 9 and the convex forming roller 11 are mounted on the rotary shafts 29 and 31, respectively.

  In FIG. 5, a driving servo motor 35 is connected to the upper rotating shaft 29 via a motor support bracket 33 on the side of the dimple forming roller. The concave forming roller 9 is rotated by the drive of the driving servo motor 35, and the convex forming roller 11 is also rotated by a coupling mechanism (not shown) in synchronism with this.

  Next, the operation will be described. As shown in FIG. 1, the tube material 1 is sequentially fed in a direction indicated by an arrow A by a drive mechanism (not shown), and a dimple 1 c is formed on the tube material 1 by a pair of dimple forming rollers in a dimple forming portion 3. At this time, the upper concave forming roller 9 rotates counterclockwise in FIG. 4, and the lower convex forming roller 11 rotates clockwise in FIG.

  After the dimple forming, the tube forming portion 5 bends the width direction side portions 1a and 1b of the tube material 1 inward as shown in FIG. 2 to form a tube having a space through which the heat exchange medium flows. . At this time, a convex portion protruding to the opposite side of the dimple 1c is exposed on the inner surface of the space in the tube. After tube formation, the tube material 1 is cut into a predetermined length by the cutting blades 15 and 17 at the tube cutting portion 7.

  In such a tube manufacturing process, the concave forming roller 9 and the convex forming roller 11 are rotated synchronously with respect to the moving speed of the tube material 1, and thereby the concave portions 9 b provided at substantially equal intervals along the circumferential direction. And the dimple 1c with a substantially constant space | interval is formed along the moving direction of the tube material 1 by the convex part 11b.

  Here, in order to change the interval in the moving direction of the tube material 1 of the dimple 1c in order to change the heat transfer coefficient by the heat exchange medium flowing in the tube, the moving speed of the tube material 1 is measured by the encoder 9, Based on this measured value, the controller 23 changes the rotational speeds of the concave forming roller 9 and the convex forming roller 11.

  The rotational speed of the concave molding roller 9 and the convex molding roller 11 is changed with respect to the moving speed of the tube material 1 as shown in FIG. 4 by molding the dimple 1c by the concave portion 9b and the convex portion 11b. After the concave portion 9b and the convex portion 11b formed with the dimple 1c are separated from the tube material 1, another concave portion 9b and the convex portion 11b positioned on the rear side in the rotation direction of the rollers 9 and 11 come into contact with the tube material 1. It implements in the area | region of the angle (theta) to.

  While the other concave portion 9b and the convex portion 11b are in contact with the tube material 1, the rotational speeds of the concave molding roller 9 and the convex molding roller 11 are returned to the original speed and synchronized with the feed speed of the tube material 1. Let Thereafter, only when the concave portion 9b and the convex portion 11b are in contact with the tube material 1, the rotational speed of the concave molding roller 9 and the convex molding roller 11 is synchronized with the feed speed of the tube material 1, and the concave portion 9b and the convex portion 11b are synchronized. By changing the rotational speeds of the concave forming roller 9 and the convex forming roller 11 only during the angle θ shown in FIG. 4 where the tube material 1 is not substantially in contact with the tube material 1, the interval in the roller rotating direction of the dimple 1c can be changed. .

  For example, by reducing the rotational speeds of the concave molding roller 9 and the convex molding roller 11 described above, the movement direction interval of the tube material 1 of the dimple 1c is widened, and conversely, by increasing the rotational speed, the tube material of the dimple 1c. The movement direction interval of 1 becomes narrow.

  The concave molding roller 9 and the convex molding roller 11 are in the state where the outer peripheral surfaces 9a and 11a thereof are not in contact with the tube material 1 in the region of the angle θ described above. Even if a relative speed difference is generated between the tube 11 and the tube material 1, they are not affected by each other, and dimple molding defects such as thinning can be prevented. At this time, the concave molding roller 9 and the convex molding roller 11 only change the rotation speed, and it is not necessary to move away from the tube material 1, so that the structure can be prevented from becoming complicated.

  Thus, according to the present embodiment, after the dimple 1c is formed by the concave portion 9b and the convex portion 11b, the concave portion 9b and the convex portion 11b are separated from the tube material 1 by the rotation of the concave molding roller 9 and the convex molding roller 11. Thereafter, the relative movement speeds of the concave molding roller 9 and the convex molding roller 11 and the tube material 1 are changed while the outer peripheral surfaces 9 a and 11 a of the concave molding roller 9 and the convex molding roller 11 are separated from the surface of the tube material 1. Since the same concave forming roller 9 and convex forming roller 11 are used, the heat transfer coefficient can be changed by changing the distance between the dimples 1c without causing dimple molding defects or complicated structures. Can do.

It is the simplified side view which shows the shaping | molding apparatus of the dimple tube for heat exchangers concerning one Embodiment of this invention. It is a perspective view which shows a mode that a tube material is bent inward gradually after dimple shaping | molding, and is formed in a tube shape. FIG. 2 is a simplified perspective view of a dimple roll used in the apparatus for forming a dimple tube for a heat exchanger in FIG. 1. It is sectional drawing of the dimple roll used for the shaping | molding apparatus of the dimple tube for heat exchangers of FIG. FIG. 2 is a more accurate cross-sectional view of the dimple forming roller corresponding to the cross section taken along the line CC of FIG. 1.

Explanation of symbols

1 Tube material (band-shaped member)
1c Dimple 9 Concave Forming Roller 9a Concave Forming Roller Outer Surface 9b Concave Forming Roller Concave 11 Convex Forming Roller 11a Convex Forming Roller Outer Surface 11b Convex Forming Roller Convex 19 Encoder (Moving Speed Measuring Means)
23 Controller (variable speed control means)

Claims (3)

  A concave forming roller (9) having a concave portion (9b) on the outer peripheral surface (9a) is provided on one side of the belt-like member (1), and a convex portion (11b) is provided on the outer peripheral surface (11a) on the other side. The convex forming rollers (11) provided are rotatably arranged, and the concave member (9b) is moved while moving the belt-like member (1) between the concave molding roller (9) and the convex molding roller (11). In the method for forming a dimple tube for a heat exchanger in which a dimple (1c) is formed on the belt-shaped member (1) between the concave forming roller (9) and the convex forming roller (11). The outer peripheral surfaces (9a, 11a) are arranged so as to be separated from the surface of the belt-shaped member (1), and the concave molding roller (9) and convex molding are performed along with the movement of the belt-shaped member (1). Each of the rollers (11) is rotated so that the recess ( The dimple (1c) is formed on the belt-like member (1) between b) and the convex portion (11b), and the concave portion (9b) and the convex portion are formed after the dimple is formed. (11b) is separated from the belt-like member (1) by the rotation of the concave molding roller (9) and the convex molding roller (11), and then the outer circumferences of the concave molding roller (9) and the convex molding roller (11). In a state where the surfaces (9a, 11a) are separated from the surface of the belt-shaped member (1), the relative movement speed of the concave molding roller (9) and the convex molding roller (11) and the belt-shaped member (1) is changed. A method for forming a dimple tube for a heat exchanger.   The moving speed of the belt-like member (1) is measured, and the rotational speed of the concave forming roller (9) and the convex forming roller (11) is changed based on the measured value. A method for forming a dimple tube for a heat exchanger.   A concave forming roller (9) having a concave portion (9b) on the outer peripheral surface (9a) is provided on one side of the belt-like member (1), and a convex portion (11b) is provided on the outer peripheral surface (11a) on the other side. The convex forming rollers (11) provided are rotatably arranged, and the concave member (9b) is moved while moving the belt-like member (1) between the concave molding roller (9) and the convex molding roller (11). In the dimple tube forming apparatus for a heat exchanger that forms dimples (1c) on the belt-like member (1) between the concave forming roller (9) and the convex forming roller (11). The outer peripheral surface (9a, 11a) is disposed so as to be separated from the surface of the strip member (1), and a moving speed measuring means (19) for measuring the moving speed of the strip member (1) is provided. Provided by this moving speed measuring means (19) The dimple (1c) is formed on the belt-like member (1) between the concave portion (9b) and the convex portion (11b) based on the moving speed of the belt-like member (1) measured by The concave portion (9b) and the convex portion (11b) formed with the dimple (1c) are separated from the belt-like member (1) by the rotation of the concave molding roller (9) and the convex molding roller (11), and the concave molding roller (9) and each of the outer peripheral surfaces (9a, 11a) of the convex molding roller (11) are separated from the surface of the belt-like member (1), and the concave molding roller (9) and the convex molding roller (11) A dimple tube forming apparatus for a heat exchanger, characterized in that a rotation speed variable control means (23) for changing the rotation speed is provided.

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