JPH10166087A - Device for winding and closely welding spiral fin in variable pitch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a heat transfer tube with a spiral fin high in efficiency and high in the latitude of design. SOLUTION: The contact part of a fin 1 and a tube 2 is irradiated with a laser beam and welded in the state where the fin end extended from the tube 2 with fin pressing rollers 13a, 13b of the fin 1 restricted with the thickness to the fin thickness direction at the tube vertical plane with fin thickness restricting guide plates 12a, 12b is wound initially on the tube 2 with initial winding rollers and the fin end is positioned and pressed on the tube 2 with fin end positioning and pressing rollers. Then, winding of the fin 1 onto the tube 2 is advanced with the fin pressing-in rollers 13a, 13b and the fin pressing rollers, and at the same time, by executing rotary-pitch-driving of the tube 2 with a rotary pitch driving device and enlarging the pitch while the fin 1 is wound, the degree of closely attaching the fin 1 and the tube 2 is improved and the heat transfer tube high in efficiency and high in the latitude of design is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for manufacturing a heat transfer tube with a spiral fin, which is formed by winding a continuous fin material around a tube used as a heat transfer part of a refrigerator, a showcase, an automobile or the like. It is about.

[0002]

2. Description of the Related Art In recent years, a heat transfer tube with a spiral fin made of a metal fin spirally wound around a straight tube has been widely used as a heat exchanger in refrigerators, showcases, automobiles, etc. due to its high cost performance. Is coming. There are a variety of methods for manufacturing a heat transfer tube with a spiral fin, but for a small one such as a refrigerator, a method of directly winding the fin into a coil while rolling the fin into a coil shape by rolling is mainly used.

As a conventional spiral fin winding device, there is one disclosed in Japanese Patent Publication No. 1-36833.

Hereinafter, the conventional spiral fin winding device will be described with reference to the drawings.

FIG. 6 is a plan view showing a conventional spiral fin winding device. In FIG. 6, 1 is a fin,
2 is a tube, 3 is a rolling pan, and 4 is a spindle roll.

A fin coil is formed by rolling a fin 1 having a rectangular cross section between a rolling pan 3 and a spindle roll 4 as shown in the figure, and the rolling surface of the rolling pan 3 is reduced on the tube side. The amount is almost zero, and is inclined so that the amount of reduction increases linearly outward.

A fin 1 is interposed between a rolling pan 3 and a spindle roll 4 shown in FIG.
By rotating the fins, the fins 1 are rolled and formed into a spiral shape. A tube having an outer diameter slightly smaller than the inner peripheral surface of the spiral fin formed at the same time is fed into the spiral fin inner peripheral surface from the right side in FIG. 6, and the fin is wound around the tube.

Further, there is a method of providing a device for applying tension to the fin 1 before rolling and bending to stabilize the diameter of the spiral fin, and winding the fin 1 around the tube 2 while controlling the tension.

[0009]

However, in the above winding method, the spiral formed when the rotation speed of the rolling pan 3 and the spindle roll 4, that is, the rolling bending speed, and the gap between the rolling pan 3 and the spindle roll 4 change. Since the inner diameter of the fin changes, there is a disadvantage that the fin 1 falls down or becomes loose.

For this purpose, there is a method in which grooves are formed on the outer peripheral surface of the tube 2 and spiral fins are inserted and caulked. However, since it is necessary to perform groove processing and caulking on the tube, productivity is reduced. There were drawbacks.

Another problem is that the heat exchange performance is low because the degree of adhesion between the fin and the tube is low.

For this reason, a method has been adopted in which necessary heat exchange performance is ensured by applying metal bonding to the fin and the tube by brazing in a furnace, but there is a problem that productivity is reduced and cost is increased.

Further, since the fin pitch cannot be freely changed during winding, there is a drawback that there is no design freedom in accordance with the required characteristics of the heat exchanger.

SUMMARY OF THE INVENTION The present invention solves the conventional problems. In an apparatus for manufacturing a heat transfer tube with a spiral fin, the fin and the tube are caulked or brazed in a furnace by improving the degree of adhesion between the fin and the tube. It is an object of the present invention to provide a manufacturing apparatus for obtaining a highly efficient heat transfer tube with a spiral fin without performing the heat transfer.

Another object of the present invention is to improve the degree of freedom of design in accordance with the required characteristics of the heat exchanger by enabling the fin pitch to be changed during winding.

[0016]

In order to achieve this object, the present invention provides a method of manufacturing a heat transfer tube with spiral fins by expanding the pitch while winding the fin wound on the vertical surface of the tube when winding the spiral fin. In addition, the spiral fin can be pressurized and wound by the residual stress, and a laser beam is radiated from the emission barrel provided to the articulated robot in the winding device to extend the contact portion between the fin and the tube over a predetermined length. By continuously joining and firmly fixing the fins, it is possible to maintain the pressure winding of the fin at the time of winding, thereby improving the heat exchange performance.

Furthermore, the fin winding pitch can be changed by making the pitch expansion amount variable, and at the fin pitch change point, the fin and the tube are welded by the laser welding device to wind the fin pitch during the winding. It is possible to change the heat exchanger tube, and thereby expand the range of application of the heat transfer tube with spiral fins by improving the degree of freedom of the heat exchanger specification.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a fin thickness regulating guide plate which is installed on a plane perpendicular to the center axis of a tube and regulates a thickness so that a continuous fin material is sandwiched in a thickness direction. A pair of fin pushing rollers that rotate while tightly attaching the material, a guide roller that holds the outside of the winding of the linear portion of the fin on the pushing roller side from the tube, and a shaft that swings on the outer circumference of the tube facing the fin pushing roller A supported fin pressing roller, a fin positioning pressure roller for positioning and pressing the wound fin on the tube, a rotation pitch driving device for chucking the tube end and driving the tube at a desired rotation pitch, and a laser from a laser oscillator. An articulated robot that guides light to the laser emission barrel with an optical fiber and holds the laser emission barrel, The fin material, whose thickness is regulated in the fin thickness direction on the tube vertical surface by the fin thickness regulation guide plate, is initially rolled around the fin end extending from the tube with a pushing roller. After welding and irradiating a laser beam to the contact portion between the fin and the tube in a state where the tube is positioned and pressurized by the positioning pressure roller, the fin is wound around the tube by a pushing roller and a pressing roller, and the above-described process is performed. The rotation pitch drive device drives the tube at a rotation pitch, thereby expanding the pitch while winding the fins.

For example, when the fin is wound on the φ5 tube orthogonal surface, the contact length between the fin and the tube is 15.7.
mm / perimeter. By expanding this to a pitch of 5 mm, the contact length becomes 16.5 mm / perimeter. That is, since the fin bending R is increased by increasing the fin pitch, the tightening force due to the residual stress contributes to the improvement of the heat exchange performance due to the improvement in the degree of close contact between the fin and the tube.

As a result, a wrapping pressure is generated between the fin and the tube due to the residual stress, and a strong close-contact winding is enabled.

A tube rotating motor for rotating the tube by a pitch feed mechanism of the rotating pitch driving device;
By installing a tube pitch drive motor that drives the tubes in pitch, the pitch rotation drive is made variable, thereby making it possible to change the fin winding pitch during spiral fin winding.

Further, a tube with a spiral fin is provided with an articulated robot for guiding the laser beam from the laser oscillator to the laser emission barrel via an optical fiber, and holding the laser emission barrel, and winding the fin from inside the fin winding device. The laser beam emitted from the exit lens barrel is focused along the circumferential direction of the tube at the contact portion between the fin and the tube without taking out the fin, and the fin and the tube are joined.

Thus, at any point including the fin winding start point and the fin winding point and the fin pitch switching point, the fin is positioned and pressed on the tube by the fin positioning pressure roller, and the fin-tube contact portion is rotated without rotating the tube. Can be welded while keeping a curved portion of a predetermined length along the circumferential direction always at the focal point of the laser and securing an optimum irradiation angle. In this manner, the fin and the tube are fixed in a state in which the fins and the pitch are secured, and a strong welding that does not cause the welding portion to come off due to the residual stress of the fin is enabled.

[0024]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a spiral fin variable pitch winding apparatus according to an embodiment of the present invention. The same components as those in the related art are denoted by the same reference numerals, and detailed description is omitted.

FIG. 1 is a plan view of a winding mechanism device according to an embodiment of the present invention, and FIG. 2 is a perspective view of the entire winding device according to the embodiment. FIG. 3 is a front view showing a fin initial bending mechanism according to an embodiment of the present invention, and FIG. 4 is a perspective view showing a fin winding start state according to the embodiment.

In the figure, reference numerals 12a and 12b denote fin thickness regulating guide plates which regulate the fin thickness direction by placing the fin on a plane perpendicular to the rotation center axis of the tube 2. In the section between the fin 1 passing through the fin push-in rollers 13a and 13b and the tube position and the section where the fin 1 is wound around the tube 2 up to a winding angle of about 120 degrees, the restricting surface has a thickness direction of the fin. Is regulated.

Reference numerals 11a and 11b denote fin pressing rollers, the rotation center axes of which are set at positions parallel to the rotation center axis of the tube 2. The width direction of the fin is adjusted by making the distance from the tube 2 equal to the width of the fin 1. The fin 1 is wound around the tube 2 by regulating and forcibly bending the traveling direction of the fin in the direction in which the fin is wound around the tube.

13a and 13b are fin pushing rollers,
16 is a push-in motor, which is a fin 1 of a continuous thin metal plate.
Is pinched by a pair of fin pushing rollers 13a and 13b, and is rotated by a pushing motor 16 so that the fin 1 is regulated in the width direction and the thickness direction of the fin by the tube 2, the fin pushing roller 11 and the fin thickness regulating guide plate 13. The fin 1 is wound around the tube 2 by being pushed into the space formed.

14 is a rotary chuck, 17 is a tube rotating motor, 18 is a tube pitch drive motor, 20 is a table on which these are arranged, 19 is a slide rail, and a tube rotating motor which clamps two ends of the tube with the rotary chuck 14. The tube is driven along a slide rail 19 by a tube pitch drive motor 17 while rotating the tube 2 at 17, thereby giving pitch rotation drive to the tube.

Reference numeral 21 denotes a laser emission lens barrel, 22 denotes an articulated robot for driving a laser emission lens barrel, 23 denotes an optical fiber,
Reference numeral 4 denotes a laser oscillation unit. The laser light from the laser oscillation unit 24 is guided to the emission lens barrel 21 by an optical fiber 23, and is focused to one point by a focusing lens housed in the emission lens barrel 21. . The laser emission lens barrel driving device 2 is set so that the focal point of the laser light is located at the contact portion between the fin 1 and the tube 2.
The positioning of the exit lens barrel 21 is performed by 2.

Numeral 25 denotes an initial winding roller for initial winding of the fins, which is driven to rotate around a center of rotation 26. The center of rotation 26 is opposite to a center of winding 28 which is the center of the tube 2 and is opposite to the fin pushing roller 13. They are eccentric in the horizontal direction and in the vertical direction to the winding start point A, respectively. In this embodiment, the amount of eccentricity is set to approximately one third of the outer diameter of the tube 2 in both the vertical and horizontal directions. Also, the initial winding roller 2
In the return state of 5, the roller outer periphery is positioned so as to be in contact with the linear portion outside the winding of the fin 1 on the side of the pushing roller 13 from the winding start point A of the fin 1, and also has the function of the guide roller of the fin 1.

27 is a fin pressing roller 11a, 11
The reciprocating rocking lever is provided with a rocking lever provided with a b, so that a distance between the tube 2 and the fin pressing roller 11 is equal to the width of the fin 1 and a retracting position where the initial winding roller 25 is not interfered with when it is turned. Is what you do.

Reference numeral 29 denotes a fin positioning pressure roller, which has a groove that comes into contact with the wound fin 1 along its outer periphery.
The fin 1 is pressed against the tube 2 by a drive cylinder, and the laser beam is focused on the contact portion between the fin 1 and the tube 2 pressed by the fin positioning pressure roller 29 and joined.

Reference numeral 30 denotes a cutting punch, 31 denotes a die, and a combination thereof constitutes a general punch press.
The cutting punch 30 and the die 3 are formed by forming a chamfered side having a size approximately half the width of the fin 1 on the side perpendicular to the length direction and a side of the winding around the tube 2 on both sides of the cut portion.
1 is molded.

The operation of the spiral fin variable-pitch close-up winding device configured as described above will be described below.

The fin 1 has fin pushing rollers 13a,
13b, the fin push-in roller is rotated by the rotation of the push-in motor 16, so that the fin thickness regulating guide plates 12a and 12b pass through the upper surface of the tube 2 into a space regulating the fin thickness direction by a set amount. After the extension, the initial winding roller 25 is moved to the turning center 26.
Is rotated around the tube 2 with.

Since the turning center 26 is eccentric toward the fin end from the winding center 28 which is the center of the tube 2,
The initial winding roller 25 is bent at the contact point between the fin 1 and the tube 2, and the winding around the tube 2 proceeds.

As the winding of the fin 1 around the tube 2 progresses, the extension distance of the fin end from the tube 2 decreases. However, since the turning center 26 is also eccentric in the direction of the winding start point A, the initial bending is performed. As the distance progresses, the distance between the initial winding roller 25 and the tube 2 also decreases and the fin ends rotate in a manner to follow.

Since the inner peripheral side of the fin end is chamfered, a straight portion remains on the outer peripheral side of the fin end even when the inner peripheral end is in contact with the tube 2. By the contact of the roller 25, a sufficient bending moment can be applied even when the winding of the inner peripheral end is completed.

When the rotation angle of the initial winding roller 25 further advances, the distance between the initial winding roller 25 and the tube 2 becomes slightly smaller than the width of the fin 1 at the position where the initial winding roller 2 moves.
Since the extending distance of the straight fin 1 from the tube 2 before the initial winding is set so as to deviate from the 5 fin end, the fin end is slightly pushed in the tube 2 direction on the outside of the fin end at the initial winding completed position. In addition, the contact portion of the inner periphery of the fin with the tube 2 is sufficiently adhered, and the remaining linear portion is pushed in the inner periphery direction, so that the outer periphery of the fin end is wound and the initial winding of the fin end is completed without protruding from the outer periphery circle. I do.

When the initial winding is completed, the initial winding roller 25 returns to a position where it comes into contact with the outside of the linear portion of the fin 1 near the fin pushing roller 13 from the winding start point A, and then the swing lever 27 moves the fin pushing roller 11a, 11
It is held at a position where the distance between b and the tube 2 becomes the width of the fin 1.

Next, the fin pushing rollers 13a, 13
When the fin is pushed in at b, couples are generated at the initial winding roller 25, the winding start point A, and the three points of the fin pressing roller 11, and the bending moment becomes the same as that of the initial winding. Wrap around.

The fin ends are positioned at the fin positioning pressure roller 29.
Is reached, the outer periphery of the fin end is pressed against the inner periphery by the fin positioning pressure roller 29, the inner periphery of the fin 1 is brought into close contact with the tube 2, and the laser emission lens barrel 21 held by the laser emission lens barrel driving device 22 The irradiated laser light is focused on the tangent line between the fin 1 and the tube 2, and the laser emission lens barrel driving device 22 is driven to move a predetermined length from the contact portion at the fin end along the curved surface of the outer periphery of the tube 2. Thus, a welded portion having a predetermined length is formed, and the starting end of the fin 1 is fixed to the tube 2 by the welded portion 15.

After the fin positioning pressure roller 29 is retracted from the pressing position by the driving cylinder, the rotation of the rotary chuck 14 chucking the tube end causes the rotation of the tube 2 and the start of the fin 1 fixed to the tube 2. The fins 1 are wound up. In synchronization with this, the fin 1 is pushed in by the fin pushing roller 13 so that the winding is easily performed.

Further, by driving the tube pitch drive motor 18 in accordance with the rotation angle of the rotary chuck 14, the table 20 on which the rotary chuck 14 is disposed is caused to travel along the slide rail 19, thereby allowing the vertical movement of the tube 2. The helical spiral fin is formed by expanding the pitch from the place where the fin wound on the surface comes out of the thickness regulation section by the fin thickness regulation guide plate 12.

When the winding pitch is changed during the winding of the fin, the winding is temporarily stopped, the outer periphery of the fin is pressed by the fin positioning pressure roller 29, and the fin 1 and the tube 2 are positioned and pressed against the tube in the same manner as the fixing of the fin start end. The laser emission barrel 21 is driven so that the focal point of the laser beam is located at the contact portion with the laser beam, and laser welding is performed, and the fin 1 is fixed to the tube 2. The purpose is to fix the fin pitch at the time of winding so as not to change due to residual stress.

After the fixing of the fin 1 and the tube 2 is completed, the winding pitch of the fin can be changed by changing the relative speed of the pushing motor 16, the tube rotating motor 17, and the tube pitch driving motor 18, so that any point can be obtained. It is possible to change the fin winding pitch.

When the required amount of spiral fins is formed, the outer periphery of the fin is pressed again by the fin positioning pressure roller 29, and the focal point of the laser beam is located at the contact portion between the fin 1 and the tube 2, similarly to the fixing of the fin start end. To perform laser welding by driving the laser emission column driving device 20 as described above.
The fin 1 is temporarily fixed to the tube 2. After this temporary fixing, the cutting punch 30 is pushed into the die 31 to cut the fins.

With the fin positioning pressurizing roller 29 pressing the fins while the press-in motor 16 is stopped, the rotary chuck 14 is driven to rotate by a pitch so that the starting end of the fin used for the next product is left in the cutting unit. The fin 1 is wound so as to be wound around the tube 2, and when the end of the fin reaches the fin positioning pressure roller 29, the rotary chuck 14 is stopped, and laser light is applied to the contact portion between the end of the fin 1 and the tube 2. Then, the laser emission barrel 20 is driven so that the focal point is located, and the laser welding is performed, and the laser welding between the fin 1 and the end and the tube 2 is performed.

After welding, the spiral fin tube whose winding has been completed is taken out of the winding device by rotating the rotary chuck 14 again.

In the spiral fin fixing device of the present invention, the irradiation position of the laser beam is controlled by an articulated robot, and the laser welding can be completed in a short time. A method of irradiating to partially fix or fix the entire circumference is also possible.

[0052]

As described above, the present invention provides a fin thickness regulating guide plate which is installed on a plane perpendicular to the center axis of a tube and regulates the thickness so that a continuous fin material is sandwiched in the thickness direction. A pair of fin push-in rollers that tightly attach and rotate a continuous fin material, a guide roller that holds the outside of the wrapping of the linear portion of the fin on the push-roller side from the tube, and swings the outer circumference of the tube facing the fin push-in roller It is composed of a fin pressing roller that is pivotally supported, a fin positioning pressure roller that positions and presses the wound fin on the tube, a rotary chuck, a tube rotation motor, a tube pitch drive motor, a table, and a slide. Pitch drive device for driving a desired rotary pitch of a tube, and a laser oscillator An articulated robot that guides the laser light to the laser emission barrel with an optical fiber and holds the laser emission barrel is provided, and the fin thickness regulation guide plate regulates the thickness in the fin thickness direction on the tube vertical plane. After the fin material that has been extended from the tube by the pushing roller is initially wound around the tube by the initial winding roller, the fin end is positioned on the tube by the fin positioning pressure roller, and the fin and the tube are pressed. After irradiating the contact portion with a laser beam and welding, the fin pushing roller and the fin pressing roller advance the winding of the fin around the tube, and at the same time, the rotation pitch driving device drives the tube by the rotation pitch,
The pitch can be increased while the fins are wound, whereby a heat transfer tube with a spiral fin having high heat exchange performance can be manufactured by the fin winding pressure due to the residual stress of the fins.

A tube rotating motor for rotating the tube by a pitch feed mechanism of the rotating pitch driving device;
By providing a tube pitch drive motor that drives the tubes in pitch, the pitch rotation drive can be changed, and the fin pitch can be changed during winding of the spiral fins, improving the degree of freedom in designing according to the required characteristics of the heat exchanger. Things.

Further, by driving the laser emission lens barrel with the articulated robot, the arbitrary contact portion between the fin and the tube can be adjusted such that a curved portion of a predetermined length along the circumferential direction thereof is always focused on the laser. In addition, since the welding can be performed while securing the optimum irradiation angle, the fin and the tube are fixed in a state where the fin winding pressure is secured, and the welded portion does not come off due to the residual stress of the fin. This enables strong welding.

As a result, the fin and the tube can be fixed without loosening the winding pressure. Furthermore, since the fin and the tube can be welded and fixed in the fin winding device even during the winding of the spiral fin, even when the winding pitch is changed during the winding of the spiral fin, the winding is performed by fixing the fin and the tube at least at the pitch switching point. It is possible to secure a fin pitch at the time.

[Brief description of the drawings]

FIG. 1 is a plan view of a spiral fin winding mechanism device according to an embodiment of the present invention.

FIG. 2 is a perspective view of the entire spiral fin winding device according to an embodiment of the present invention.

FIG. 3 is a front view showing a fin initial bending mechanism according to an embodiment of the present invention;

FIG. 4 is a perspective view showing the start of fin winding according to an embodiment of the present invention;

FIG. 5 is a perspective view showing a fin winding end according to an embodiment of the present invention;

FIG. 6 is a plan view showing a conventional fin winding method.

[Explanation of symbols]

 Reference Signs List 1 fin 2 tube 3 rolling pan 4 spindle roll 11a, 11b fin pressing roller 12a, 12b fin thickness regulating guide plate 13a, 13b fin pushing roller 14 rotary chuck 15 joint 16 pushing motor 17 tube rotating motor 18 tube pitch driving motor 19 Slide rail 20 Table 21 Laser emission lens barrel 22 Laser emission lens barrel driving device 23 Optical fiber 24 Laser oscillation unit 25 Initial winding roller 26 Rotation center 27 Swing lever 28 Winding center 29 Fin positioning pressure roller 30 Cutting punch 31 Die

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masayuki Miyato 4-5-2-5 Takaidahondori, Higashiosaka-shi, Osaka Matsushita Refrigeration Co., Ltd.

Claims (3)

[Claims] 1. A fin thickness regulating guide plate which is installed on a plane perpendicular to a center axis of a tube and regulates a thickness of a continuous fin material so as to sandwich the fin material in a thickness direction. A pair of rotating push-in rollers, an initial winding roller that holds the outside of the winding of the linear portion of the fin on the push-in roller side from the tube, and a fin to obtain a strong bond when the wound fin is laser-welded to the tube. A fin positioning pressure roller for positioning and pressing the tube, a rotation pitch driving device for chucking the tube end and driving the tube at a desired rotation pitch, and a laser emission barrel for irradiating laser light from a laser oscillator. The fin material whose thickness is regulated in the fin thickness direction on the tube vertical surface by the fin thickness regulation guide plate is pushed. The fin end extending from the tube with the wrapping roller is initially wound around the tube with the initial winding roller, and the fin end is positioned on the tube with the fin positioning pressure roller. After the irradiation and welding, the fin is wound around the tube by the pushing roller and the pressing roller, and at the same time, the rotating pitch drive device drives the tube by the rotating pitch, thereby increasing the pitch of the spiral fin while winding the fin. Variable pitch close-contact winding device. 2. A spiral feeder of a rotary pitch drive device, comprising a tube rotation motor for driving a tube for rotation and a tube pitch drive motor for driving a tube at a pitch, thereby making the rotation pitch drive variable. The spiral fin pitch variable close-up winding device according to claim 1, wherein the fin pitch can be changed during the fin winding. 3. At the fin winding start point, winding end point, fin pitch change point, and any other point, the laser beam from the laser oscillator is guided to the laser emission barrel by an optical fiber, and the laser emission barrel is held. 3. The fin and the tube according to claim 1 or 2, wherein the fin and the tube are joined by making the laser beam emitted from the emission lens barrel focus on the contact portion between the fin and the tube along the circumferential direction of the tube. Spiral fin pitch variable contact winding device.