JPS5840120B2 - Fin tube manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a fin tube in which fins are formed of thin metal wires.

When exchanging heat between fluids with significantly different heat transfer coefficients through heat transfer tubes, it is common to increase the fluid contact area on the side with a smaller heat transfer coefficient in order to promote heat transfer and reduce the number of heat transfer tubes. It is being done.

Especially in heat exchanges such as hot gas-water, air-thermal (warm) water, etc.
Since the ratio of heat transfer coefficients differs by about 30 to 100 times, it is common to use fins that protrude from the heat transfer tube and set the ratio of heat transfer coefficients per tube in the range of 3 to 10 times. It is true.

Conventionally, such fin tubes include the following.

In other words, ■ As shown in Figure 1, fin 2 is attached to tube 1.
■ Those in which the fins 2 are mechanically crimped onto the tube 1 as shown in Figure 2, ■ Those in which the fins 2 are attached to the tube 1 by rolling as shown in Figure 3, and ■ The fins 2 are attached to the tube 1 by rolling as shown in Figure 3. As shown in Fig. 4, there is one in which the fins 2 and the tube 1 are manufactured as an integral structure using an extrusion or drawing die.

Each of the conventional fin tubes described above has the following drawbacks.

That is, the fin tube described in ■■■ above is generally expensive.

In the finned tube of ■■, the fins 2 are not welded to the tube 1, so a space is likely to be formed at the contact surface between the fin 2 and the tube 1, and this space becomes a heat transfer resistance.

Although the fin tube (2) can be mass-produced and is inexpensive, it has the disadvantage that it is not possible to produce love-alternative fins.

The present invention provides a method for manufacturing a fin tube that solves these problems, and is characterized by the upper frames 3 connected by a hinge 1 and capable of coming into contact with and separating from each other.
and a lower frame 4 are provided, cuts 5 and 6 are formed in the abutting surfaces of the upper frame 3 and the lower frame 4, respectively, and cuts are made in the upper frame 3 and the lower frame 4 at regular intervals along the cuts 5 and 6. The support frame 2 is formed by forming a large number of sulins 7.8, and the upper frame 3 of the support frame 2 is rotated upward to arrange the heat transfer tube 9 in the cut 6 of the lower frame 4, Both ends of the tube 9 are connected to a rotating machine, and then one end of the thin metal wire 10 is glued to a location corresponding to each slit 7.8 of the heat transfer tube 9, and the upper frame 3 is rotated downward. The frame 3 and the lower frame 4 are brought into contact with each other, and then the rotating machine is driven to rotate the heat transfer tube 9, and each thin metal wire 10 is wound in a layered manner on the tube 9 within each slit 7.8. Once each thin metal wire 10 has been wound to a certain length, each thin metal wire 10 is fused and the terminal end of each thin wire 10 is bonded to each thin metal wire 10 that has already been wound, and then the fins 11 are attached. The heat transfer tube 9 is removed from the support frame 2 and placed in a heating furnace to heat it, melting only the surface of the thin metal wire 100 and forming each thin metal wire 10.
The inner and outer circumferential surfaces of each layer are fused to each other and to the heat transfer tube 9, and the fins are taken out of the heating furnace and cooled. With this configuration, the surface area is wider than that of conventional plate-shaped fins. , a large number of fins 11 having a large heat transfer coefficient can be attached to the heat transfer tube 9 at once, and the fin tube can be mass-produced and inexpensive.

Hereinafter, one embodiment of the present invention will be described based on FIGS. 5 and 6.

First, an upper frame 3 and a lower frame 4 which are connected to each other by a hinge 1 and can freely come into contact with and separate from each other are provided, and cuts 5 and 6 are respectively formed in the contact surfaces of the upper frame 3 and the lower frame 4, and the cuts 5 , 6 along the upper frame 3 and lower frame 4 at regular intervals) 7
．． 8 is formed in large numbers to constitute the support frame 2.

The upper frame 3 of the support frame body 2 is rotated upward and the lower frame 4
A heat transfer tube 9 is placed in the notch 6 of the tube 9.
0 and both ends are connected to a rotating machine (not shown).

Next, one end of the thin metal wire 10 is bonded to a location corresponding to each slit 7.8 of the heat transfer tube 9 by spot welding or applying a voltage directly to the tube 9 and the thin metal wire 10, and the upper frame 3 is rotated downward. The upper frame 3 and the lower frame 4 are brought into contact with each other by moving the upper frame 3 and the lower frame 4.

Next, the rotating machine is driven to rotate the heat transfer tube 9.

Then, each thin metal wire 10 is wound in a layered manner onto the tube 9 within each slit 7°8.

After each thin metal wire 10 is wound to a certain length, it is fused by an arc or the like, and the terminal end of the thin wire 10 is bonded to each thin metal wire 10 that has already been wound.

Although the fins 11 are formed in this state, there is a risk that the laminated thin metal wires 10 may break when some pressing force is applied.
The attached heat transfer tube 9 is removed from the support frame 2, placed in a heating furnace (not shown), and heated to melt only the surface of the thin metal wire 100 and fuse the inner and outer peripheral surfaces of each layer of each thin metal wire 10 to each other. At the same time, it is fused to the heat transfer tube 9, taken out from the heating furnace, and cooled to obtain a fin tube.

Note that various cross-sectional shapes of the thin metal wire 10 can be considered, such as round, triangular, and square.

Further, in the above embodiment, one thin metal wire 10 is wound around each sulin (7.8), but two or more metal wires may be wound around each wire (7.8).

As described above, according to the fin tube manufacturing method of the present invention, a large number of fins 11 having a larger surface area and a larger heat transfer coefficient than conventional plate-like fins can be attached to the heat transfer tube 9 at once. It can be mass-produced,
It is possible to obtain an inexpensive fin tube.

[Brief explanation of the drawing]

1 to 4 are a sectional view and a perspective view showing a conventional fin tube, respectively, FIGS. 5 and 6 show an embodiment of the present invention, FIG. 5 is a side view, and FIG. 6 is a front view. It is a diagram. 2... Support frame body, 9... Heat transfer tube 10...
Fine metal wire, 11...fin.

Claims (1)

[Claims] 1. An upper frame 3 and a lower frame 4 are provided which are connected by a hinge 1 and can freely come into contact with and separate from each other, and cutouts 5 and 6 are formed in the contact surfaces of the upper frame 3 and the lower frame 4, respectively, and the cutouts 5, The support frame body 2 is constructed by forming a large number of sulins) 7.8 at regular intervals along the upper frame 3 and the lower frame 4 along the upper frame 3 and the lower frame 4, and the upper frame 3 of the support frame body 2 is rotated upward. A heat transfer tube 9 is placed in the notch 6 of the lower frame 4, both ends of the tube 90 are connected to a rotating machine, and then one end of the thin metal wire 10 is placed at a location corresponding to each slit 7.8 of the heat transfer tube 9. After adhering, the upper frame 3 is rotated downward to bring the upper frame 3 and the lower frame 4 into contact with each other, and then the rotary machine is driven to rotate the heat transfer tube 9 to separate each thin metal wire 10. Surin) 7.8 is wound in a laminated manner on the tube 9, and when each thin metal wire 10 is wound to a certain length, each thin metal wire 10 is fused and the terminal end of each thin wire 10 is wrapped around the tube 9. Next, the heat transfer tube 9 with fins 11 is also removed from the support frame 2, and heated by placing it in a heating furnace to melt only the surface of the metal wire 10. 1
A method for producing a fin tube, which comprises fusing the inner and outer circumferential surfaces of each layer of 0 to each other and to a heat transfer tube 9, and then taking it out of a heating furnace and cooling it.