JPS589718A - Fixing method of helical fin to tube and the like - Google Patents

Abstract

PURPOSE:To prevent generation of a clearance between the outer diameter of a tube and inner diameter of a fin by reforming a conical-helical formed fin material to a helical form to generate a shrinkage at the inner diameter part of the fin material and by fixing the fin material to a prescribed place on the outer periphery of the tube. CONSTITUTION:A conical-helical formed fin material 2a is wound and attached on a shaft 3 positioned nearly perpendicular to a tube 1. In transferring the material 2a from the core shaft 3 to the tube 1 through and winding the material 2a is reformed into a conical shape by a squeeze roll 4. In other words, the material 2a has a conical-helical form and retains an angle theta1 at the position where the material 2a is initially wound on the tube 1. Next the fin material 2a is raised to an angle theta2 and lastly forcing to an angle theta3 by a roll 4 to be welded and fixed. Here by providing a relation theta1<theta2<90 deg.=theta3, the inner diameter of the material 2a shrinks to the outer diameter of the tube 1 equally with angle theta3 and is fixed tightly to the outer diameter of the tube 1 and welding is smoothly performed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a helical finned chapet or a method for attaching fins to a rod. It is often used in places where various types of heat exchange are performed, such as through tarps. For such a helical fin equipped tip, the present inventor proposed a new fin mounting method as shown in FIG.

This will now be explained with reference to FIGS. 1 and 3, which are embodiments of the present invention. Il is Chape KII!
The helical-shaped fins attached and in contact with each other are helical-shaped twin materials that are preformed and wound around the core shaft S so that they can rotate and slide freely. Then, the helicoidal fin material 9a wound on the core shaft SK is moved in the axial direction while rotating the tube in the direction in which the fin material mad is wound. Besides, the core axis r
1m of sK wrapped fin material? % can be transferred to tube 1. At this time, the core shaft 3 is a helicoidal fin material 8
The rotary tube a rotates in the same direction and at the same speed to assist, and 4 is a ninth gear for high-frequency welding, for example, which is used to weld the p-fin material a while pressing it against the tube. be.

The above-described fin attachment method has the advantage that the fin material can be attached to the tube more smoothly than the conventional method of welding the fin material wound into a coil to the tube 1 while stretching it straight. But glt! lQ
There are still some points left to be improved in the method shown in Figure 1, and this is the result of this improvement.

That is, as shown in Fig. 111, when the core shaft StC@ is wound around the outer diameter of the helicoidal wire y*tmat chap, the inner diameter d of the fin material and the outer diameter of the tube are d-
D or slightly larger fins, however, due to manufacturing errors, the outer diameter of the tube is likely to be larger than the diameter of the outer diameter of the tube. is fin material m@f tube IK
When welding and fixing the tube, variations in contact resistance occur, and the inner diameter of the fin and the outer diameter of the tube come into close contact, causing welding defects. If the fin material is pressed strongly against the outside diameter of the tube with the fin 1, the tube will deform during the fin deformation, which is undesirable.In addition, the fin material S& will simply curl into a coiled shape. The gap described above [for spinning, the inner diameter d of the fin material must be made smaller than the outer diameter of the tube, and some tension must be applied during winding. Wrapping could be hindered due to variations in material quality, etc. Furthermore, K, which is formed with the inner diameter of the fin material dYtf smaller than the outer diameter of the tube, requires a large winding force, and It was not suitable for thin-walled tubes due to bending stress.

The zero firing If4 is an improvement on the above problem, and the fishi material 1at core shaft 8 has a conical helical shape (conical spiral shape) Kl.
When transferring from this state to wrapping and wrapping, the conical helical twin material is corrected into a hesical shape using a nutize roll and then installed. The present invention will be described in detail with reference to Figure g2 and the following drawings.

As shown in FIG.
1 The fin material S is formed not in a helical shape but in a helical conical shape, and the fin material is transferred from the core shaft S to the tube 1 and then squeezed and squeezed.
It is corrected to a tsekal shape by. That is, before the tube IK is wound, the fin material 1a has a calconical edge shape, and has an angle to K as shown in the gs diagram.
In the initial position where the P-shaped chape iK is wound, the angle to K is maintained as shown in Figure 4. Next, the same figure BK
# As shown, the proverbial angle is raised, and finally the Nutaizu four-
It is forcibly pulled up at an angle of 40 degrees by the ring number and fixed by welding. Here, if we set the relationship # wealth〈ra〉90″=40, when ra, the inner diameter opening φ of the fin material Oboro contracts and the outer diameter of the chapue becomes equal to, and the fin material ■ sticks tightly to the outer periphery of the tube. Solving 1 [I is carried out in a numoise manner.

The shape of the outer peripheral groove of the squeeze roll 4 may be a simple groove as shown in FIG. 4 CK, but a squeeze roll 11 having the shape shown in FIG. 7 may also be used. At least on one side, the wall is inclined toward the center so that the width of the bottom of the concave groove 4 m' becomes narrower. When pushed into the bottom of the groove 4a', the inner wall of one side O forces the -
This is caused by an angle change of 1 to 4.

The moving head 9 is a feeder, and the body feeder 9 is inclined at a predetermined angle with respect to the axis of the tube l. One company will be rotated. λO is taken out, 1 is a motor generator for high frequency welding, 6 is an arm with a squeeze roll 4 supported at its tip via a bearing 6, and a squeeze roll 4 is supported on the core shaft 8 at a position opposite to this arm. The fin material ■& is arranged,
The tube IK is continuously wound.

As is clear from the above description, the present invention has the following effects.

■ Conical helical fin material is used for cutting outer periphery KI#
By correcting the fin material into a hemline shape at that time, the inner diameter peak of the fin material shrinks and can be brought into close contact with the outer circumference of the tube, so there is no gap between the fin material, the tube, and the O-Seki K111, which is caused by a gap. Eliminates poor adhesion of welds.

■ Since the conical helical fin material is used, even if the inner diameter 4 is slightly hotter than the outer diameter of the tube, it can be easily attached to the outer circumference of the tube. It is easy to chain, absorbs variations in materials, etc., and is easy to manufacture.

■ By correcting the conical helical tip into a helical shape, the outer circumference of the tip is AK9! Since it is now possible to tear the tube, a spiral groove is formed on the outer periphery of the tube to fit the helical twin tube.
As a result, it is easy to fit the helical twin tube into the groove while straightening it, and in this case, there is no need to fix it by welding etc.

[Brief explanation of drawings]

Figure 1 (W, 1) is a surface view and a plan explanatory view showing how to attach the twin material to the chip. Fig. 1 is an enlarged perspective view of an embodiment of the method of the present invention, and Fig. 3 is a fractured normal view of a conical helical fin material. IQ definitely indicates the corrective device stage of the fin material! Figure IIS is an explanatory diagram of the fin material mounting device, Figure II6 is an enlarged perspective view of the beginning of twin material winding, and Figure 7m is an enlarged view of an embodiment of the squeeze roll. L・Axis tip, excitation...fin, 4...squeeze roll・

Claims (1)

[Scope of Claims] 11) When installing the conical helical fin # on the outer periphery of the chain, the conical helical fin material tube is corrected into a helical shape while being corrected into a scissors helical shape. A method for fixing an island helical fin to a chain, etc., characterized by fixing the inner diameter part of the shrunk fin material to a predetermined position on the outer frame of the chain. (21) A method for fixing a helical fin to a tape or the like according to claim O1! BIER, characterized in that a squeeze roll is used as a means for correcting a conical helical fin material tube into a helical shape.