JPS6087979A - Welding device for spiral fin - Google Patents

Abstract

PURPOSE:To obtain a spiral fin tube having a good heat exchanging rate by providing a welding torch which is regulated by a fin guide moving under rotation by the rotation of a rotating body and enabling welding of the idle winding part of the spiral fins. CONSTITUTION:A titled welding device consists of a rotating body 11, a fin guide 22 which is attached integrally to said body and is fitted to spiral fins 2 and a welding torch 24. Said body 11 is driven so as to be made rotatable around the fins 2 and movable in the longitudinal direction of a tube 1. The torch 24 is moved under rotation by the rotation of the body 1 and welds the idle winding part 2b of the fins 2 while the movment is regulated by the guide 22. The part 2b of the fins 2 which are wound to the tube 1 and are welded to the tube 1 and are partly idle-wound is welded by the above-mentioned device, by which the spiral fin tube having a good heat exchange rate is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for welding the hollow-wound part of a spiral fin, in which a part of the spiral fin is welded to a tube and the other part is hollow-wound. It is suitable for use when

Conventionally, spiral fin tubes used in heat exchangers, for example, spiral fin tubes used in stick-pend type heat exchangers, have been manufactured by bending part (b) of the curve as shown in Figure 1. #1 Crab, take the allowance T1 required for groove processing and butt welding, allowance B for the bending part, etc., wrap the tube IK spiral fin 2 and weld, then process the 1 end of the tube, It was used for round bending and welding to other tubes, etc.

However, the resulting spiral fin tube remains as a bare tube with poor heat transfer efficiency, so if you use this spiral fin tube to make heat exchangers,
In order to obtain a predetermined capacity, the size of the heat exchangers must be increased, which also increases costs.

Therefore, as always, you must take F! It is desired to wrap the spiral fin 2'fr to the extent of the machining allowance required to realize a spiral fin tube that increases the heat exchange rate.

The present invention focuses on the fact that spiral fins have elasticity, and the length of winding around the tube including the machining allowance for the spiral fin tube is such that the length of the tube is such that at least the machining allowance can be secured when the end of the spiral fin is compressed. I left the spiral fin to weld to the tube, shortened the end of the spine fin, processed the tube end in that state, and then stretched out the shortened spiral fin end and welded it to the tube. The overall purpose is to make it possible to completely weld the spiral fins even to the parts that were conventionally rare in bare tubes, thereby improving the heat exchange efficiency of the spiral fin tubes, thereby reducing the size and cost of heat exchangers.

The structure of the present invention that achieves the above object is a device for welding the empty winding portion of a spiral fin that is wound around a tube, a part of which is welded to the tube, and a part of which is wound around the tube. A rotating body that can be driven and rotated by the rotation of the fin and movable in the longitudinal direction of the tube, a fin guide that is integrally attached to the rotating body and fitted to the spiral fin, and a fin guide that is rotated by the rotation of the rotating body. and a welding torch for welding all the empty winding portions of the spiral fly which is regulated by the fin guide and is moved while moving.

Hereinafter, the spiral fin welding apparatus according to the present invention will be explained in detail with reference to the drawings.

FIGS. 2 and 3 show the work steps before applying the spiral fin welding apparatus according to the present invention. tube 1
includes machining allowances T and B, as shown in Figure 2.
Even after processing, the spiral fin 2 is wrapped around almost the entire length of the straight part, and the processing allowance T or B is long enough to ensure the processing allowance T or B when both ends are compressed.
The remaining portion is welded to the tube 2, leaving the +fin shrinkage allowance P) as the empty winding portion 2b.

In FIGS. 2 and 3, the area indicated by L' is the welded portion 2a. In addition, since the spiral fin 2 is continuously provided on the straight part of the other tube end connected to the tube 1, the processing allowance also includes the allowance for bevelling and welding of the other tube end. . In a state where the spiral fin 2 is welded over a length L' and an empty winding part 2b'i is formed at both ends, the empty winding part 2b is on the welded side of the spiral fin 2, as shown in FIG. The tube 1 is compressed and the processing allowances T and B are secured on the tube 1. In this state, the end side of the tube 1 is processed, for example, the bead part of the tube 1 is bent.
Other tubes are welded, etc. After this, the shortened spiral fin 2b is extended to the machining allowances T and B,
This is because it is welded to the tube 1 or to the tube 1 and the tube connected to it. Since the portion of the spiral fin 2 to be welded in advance is welded with a certain bit, it is convenient to carry out this welding using a vertical welding portion, as shown in FIG. 4.

An embodiment of a device according to the present invention, which welds the empty winding portion 2b using this welded portion, is shown in FIGS. 5 and 6.

The rotating body 11 rotatably arranged around the outer periphery of the spiral fin 2 welded to the tube 1 has a cylindrical shape, and is divided into two parts so that it can be attached and detached at each straight part of the tube 1, which has a bent part and a header at the end. It can be assembled with Shi, bolt, and nut. At the tip of the rotating body 11, the rotating body 11''
A gear 12 is integrally formed to receive a driving force from the outside for driving the rotation. Of course, this gear 12 is also divided into two pieces together with the rotating body 11. The gear 12 may be formed not at the tip of the rotating body 11 but at the rear end or other location. A two-piece thrust guide 13 is integrally provided at the tip of the rotating body 11, and on its inner periphery,
Spiral fin 2 with the same pitch as spiral fin 2
A groove 14 into which the holder is fitted is formed.

A cylindrical propelling body 15 is fitted onto the outer peripheral surface of the rotating body 11, and the rotating body 11 is rotatable with respect to this propelling body 15. This propellant 15 is also split into two,
Can be assembled with bolts, nuts, etc. A drive motor 16 is installed on the outer peripheral surface of the propelling body 15, and a drive gear 17 attached to the output shaft of the drive motor 16 is meshed with a gear 12 integral with the rotating body 11. Further, the propulsion body 15 is provided with a propulsion guide bar 18, which is slidably fitted into a groove 20 of a rail 19 parallel to the straight portion of the tube 1. Therefore, when the drive motor 6 on the propulsion body 15 is driven, since the propulsion guide bar 18 is engaged with the rail 19 and prevented from rotating, rotational force is transmitted to the drive gear 17 and the gear 12, causing rotation. The body 11 is rotated,
Since the groove 14 of the thrust guide 13 integrated therewith is fitted with the spiral fin 2, the rotating body 11 moves straight while rotating the spiral fin 2 like a lead screw.

On the other hand, a comb-shaped fin guide 22 having a plurality of grooves 21 that fit into the spiral fins 2 is attached to the tip of the thrust guide 13 .

The distance t between the tip of the fin guide 22 and the groove 21a closest to the tip is such that the pitch of the spiral fins 2 is also large. In other words, the distance between the tip of the fin guide 22 and the groove 21a closest to the tip and the test spiral fin 2 can be made large. A welding torch 24 is supported on the pusher guide 13 via a support member 23, and a wire feeder 27 and a wire reel 28d are supported via support members 25 and 26'ii'', respectively. Torch 24, wire feeding device 2
7. The wire reel 28 only needs to move forward while rotating together with the rotating body 11, and does not necessarily need to be integrated with the rotating body 11 side.

With the above device, the empty winding part 2bt of the
To weld, first, the two E1 rollers 11 and the propellant 15 are placed on the outer periphery of the spiral fin 2, which is welded to the entire tube 1, and attached with bolts and nuts. At this time, the thrust guide 13 of the rotating body 11 and the fin guide 22
The fin guide 22 is inserted into each groove 14.21 of the fin guide 22 at its tip 911.
It is made to fit into the final type i (the part just before reaching the empty winding part 2b) of the Snowflake Fin 2 which is welded with 12L force. Further, the welding torch 24 has its tip connected to the groove 21a on the front end side.
l: Spiral fin 2 and tube 1 regulated by
The position is adjusted so that the corner tube is flush with the pipe. Note that since this position is fixed, the position of the welding torch 24 may be adjusted in advance.

When the device distribution is completed as described above, drive motor 1!
The rotating body 1 is driven through the drive gear 17 and the gear 12.
1. Rotate the thrust guide 13 and fin guide 22.

As the thrust guide 13 rotates, the spiral fin 2 serves as a lead screw, and the rotating body 11 and the thrust guide 13
, the fin guide 22, the welding torch 24, etc. move forward while rotating. In conjunction with this forward movement, an arc is generated between the welding torch 24, the spiral fin 2, and the tube 1, and fillet welding is performed between the tube 1 and the spiral fin empty winding portion 2b.

After welding the empty winding part 2b, divide the device into two parts,
Remove it from the tube 1 and move on to welding the other hollow sound μ.

In the above embodiment, a propelling body 15 etc. is provided as a means for driving and rotating the rotating body 11 to form a double cylinder structure. Good too. For example, it is conceivable that a gear which is meshed with the gear 12 of the rotating body 11 and rotated by weight is moved along the tube 1 from an independent support device. still,
The means for transmitting rotational force is not limited to gears either. Further, if the thrust force is obtained only by the fin guide 22, the idle winding portion 2b of the fin 2 is compressed toward the welded portion 2a by the idle winding fixing jig 29.

As described above in detail based on the embodiments, according to the welding device of the present invention, it is possible to weld the idle portion of the already welded yarn (with the yarn fin as a guide), and it is possible to weld the blank part of the already welded yarn using the yarn fin as a guide. It is possible to attach spiral fins to the entire length of the pipe.
Therefore, it is possible to obtain a spiral fin tube with a good heat exchange efficiency, and as a result, it is possible to achieve miniaturization and cost reduction of heat exchangers.

[Brief explanation of drawings]

tg1 is an explanatory diagram of the conventional manufacturing method of a spiral fin tube, FIGS. 2 and 3 are explanatory diagrams showing the processing of the tube and spiral fin up to the stage before applying the present invention, and FIG. 4 is an explanatory diagram of the conventional manufacturing method of the spiral fin tube. FIG. 5 is a perspective view of an embodiment of the spiral fin welding apparatus according to the present invention, and FIG. 6 is a sectional view thereof. In the drawing, 1 tube, 2 is a spiral fin, 2b is an empty winding part of the spiral fin, 11 is a rotating body, 12 is a gear, 13 is a thrust guide, 14 is a groove of the thrust guide, 15 is a propelling body, 16 is a A drive motor, F is a drive gear, 21 is a fin guide groove, 22 is a fin guide, and 24 is a welding torch. Patent applicant Mitsubishi Heavy Industries, Ltd. Sub-agent Patent attorney Shibe Mitsuishi (1 other person)

Claims (1)

[Claims] A device for welding the empty winding part of a spiral fin that is wrapped around a tube, a part of which is welded to the tube, and a part of which is unwound around the tube, and which can be driven and rotated around the spiral fin and which can a rotating body that is movable in a direction; a fin guide that is integrally attached to the rotating body and fitted to a spiral fin; and a fin guide that is moved while rotating as the rotating body is rotated. Spiral fin welding equipment R8 characterized by comprising a welding torch for welding the empty winding portion of the spiral fin.