JP2911854B2 - Finned tube and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a finned tube and a method for manufacturing the same.

[0002]

2. Description of the Related Art FIGS. 7 and 8 show a conventional finned tube. The finned tube 1 shown in FIG. 7 has a fin 4 made of aluminum on a peripheral surface of a straight pipe portion 3 of a pipe material 2 made of a meandering copper material, and the outer peripheral edge of the fin 4 is made circular by a fin winding machine. The finned tube 1 shown in FIG. 8 is a straight tube portion 3 of a tube material 2 made of a meandering copper material. The aluminum fins 4 each having a continuous shape and having a notch 5 formed thereon are driven at a predetermined pitch on the peripheral surface of the fin 4 so that the fins 4 are fixed to the tube 2.

[0003]

Among the finned tubes 1 of the prior art described above, the fins 4 wound around the tube 2 have a small contact area between the fins 4 and the tube 2 due to the restriction of the fin winding machine, so that heat exchange is difficult. Low efficiency. On the other hand, when the fins 4 are driven into the tube material 2, there is a problem that the pitch of the fins 4 cannot be made very small due to the operation of driving the fins 4. Therefore, the heat exchanger using these finned tubes is large. However, there were problems such as a small heat radiation area.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and has a large heat radiation area.
The purpose of the present invention is to provide a compact finned tube.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, a finned tube of the present invention is provided with a U-shaped cut portion formed in a thin and long shape having a predetermined width and having a predetermined pitch. The fin member includes a fin forming portion on which the raised fin is formed, and a fin member having a bent portion formed more than the fin forming portion following the fin forming portion. It is wound around a straight pipe part, and the bent part is wound around a curved pipe part of a pipe material.

According to another aspect of the present invention, there is provided a method of manufacturing a finned tube, comprising: a thin and long fin forming portion having a predetermined width; and a bending portion having a narrower width than the fin forming portion. And a fin member having a U-shaped notch at a predetermined pitch is formed in the fin forming portion to form a fin, and then the fin member is finned from the surface of the tube material. Abuts so as to project, while moving the tube in the axial direction while rotating the tube, and feeding the fin member at a speed synchronized with the tube while spirally forming the fin forming portion and the bent portion of the fin member in the tube. The finned tube is formed by winding and then bending the wound tube material at the bent portion to form a bent tube portion.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a finned tube according to the present invention will be described below with reference to FIGS.

FIG. 1 is an overall perspective view of a heat exchanger using a finned tube.
, A connecting plate 12, and a connector 13. The finned tube 11 includes a tube material 14 and a fin member 15. The refrigerant is sent from the inlet A to the outlet B by a compressor (not shown) inside the pipe member 14. Further, as shown by an arrow C, the air
The refrigerant flowing in the direction perpendicular to the direction 4 and flowing inside the pipe member 14 via the fin member 15 is cooled.

The pipe member 14 is made of, for example, iron, and is formed so that the straight pipe part 16 is parallel and meanders through a curved pipe part 17 as shown in FIG. 1, and a fin member 15 as shown in FIG. Is wound and fixed. A connecting plate 12 is fixed near an end of the straight pipe portion 16 in the axial direction, and a connector 13 is connected between ends of two adjacent straight pipe portions 16.

The fin member 15 is made of, for example, an iron material. As shown in FIG. 3, the fin member 15 has a fin forming portion 18 and a bent portion 19, and the fin forming portion 18 and the bent portion 19 are alternately arranged in the longitudinal direction. .

The fin forming portion 18 is a thin and elongated shape having a width wider than the diameter of the tube 14 (for example, a width of 25 m / m with respect to the outer diameter of the tube 6.35 m / m). The length is such that the tube portion 16 can be spirally wound at a predetermined pitch (see FIG. 2). Then, as shown in FIG. 3, the fin forming portion 18 has a longitudinal direction of, for example, 7 m / m.
A U-shaped cut portion 20 is formed at a pitch, and the cut portion 20 is raised to form a fin 21. In addition, since the base 22 of the fin 21 is wound around the outer periphery of the tube member 14, the fin 21 has an arc shape. Accordingly, the fin 21 is correspondingly divided by the cut 21a (in the present embodiment, divided into two). In addition, the fins 21
As shown in the figure, the fins 21 are erected at different angles to the surface of the tube 14 in order to improve the contact with the air flow and increase the efficiency of the heat exchanger. .

The bent portion 19 has a width substantially corresponding to the outer diameter of the tube 14, and has a length that can be spirally wound at a predetermined pitch with respect to the curved tube portion 17 of the tube 14. (See FIGS. 2 and 4). In addition, processes such as punching and standing for forming the fins 21 are automatically performed by a computer-controlled machine.

The connector 13 is provided with two adjacent pipes 1.
4 are connected laterally, and are formed so as to minimize the pressure loss. The connector 13 may be a U-bend tube.

Next, a method of manufacturing the finned tube 11 will be described.

First, both ends of the tube 14 are gripped by chucks of a winding machine (not shown), and as shown in FIG.
Is rotated at a predetermined speed in the axial direction (E direction) while rotating in the D direction at a predetermined speed about the axis, and the longitudinal direction of the fin member 15 is set at a predetermined angle α (about 45 °), and feeds in a direction (F direction) toward the tube 14 at a speed synchronized with the rotation speed and the feed speed of the tube 14, and the fin forming portion 18 of the fin member 15.
And the bent portion 19 are spirally wound around the pipe material 14 at a predetermined pitch. The angle α is an angle automatically determined by the width of the fin member 15 and the diameter of the tube member 14 at an angle at which the winding portions of the fin members 15 adjacent to each other in the longitudinal direction of the tube member 14 come into close contact with no gap. Thereafter, the finned tube 11 is manufactured by bending a portion of the fin member 15 where the bent portion 19 is wound around the tube material 14 into a U-shape by a bender (not shown). The fin member 15 is spot-welded to the tube 14 at the start and end of the winding. All of the above operations are automatically performed by computer control.

Further, in order to ensure the close contact between the tube member 14 and the fin member 15, an adhesive is applied to the surface of the fin member 15 in contact with the tube member 14, and then the fin member 1 is coated.
5 may be wound around the tube 14.

In this embodiment, the pipe member 14 and the fin member 15 are made of iron, but may be made of copper, aluminum or the like. In addition, although cooling is performed by air, liquid such as water may be used.

Since the finned tube 11 is configured as described above, the pitch of the fins 21 can be made fine, and the heat radiation area becomes large.
The heat exchanger using is small.

[0019]

As described above, according to the present invention,
The finned tube has a fin forming portion in which a fin is formed in a thin and elongated shape having a predetermined width, and a U-shaped cut portion having a predetermined pitch is formed, and a fin forming portion is formed following the fin forming portion. And a fin member having a bent portion formed with a narrow width. The fin forming portion of the fin member is wound around a straight pipe portion of a tube material, and the bent portion is wound around a curved tube portion of the tube material. The pitch of the fins can be finer by reducing the rising dimension,
Therefore, a radiating area can be efficiently obtained, so that a finned tube can be provided from the viewpoint of heat exchange performance. By increasing the number of fins, a small and compact finned tube having a small outer diameter can be obtained. Further, when the rising angles of the fins are formed at different angles, the area of the fin that hits the fluid can be further increased, and the heat exchange performance can be further improved.

On the other hand, the method of manufacturing a finned tube is characterized in that a fin having a thin and long fin forming portion having a predetermined width and a bent portion having a narrower width than the fin forming portion are alternately formed in the longitudinal direction. Forming a member, in the fin forming portion,
After raising a U-shaped cut portion of a predetermined pitch to form a fin, abutting the fin member such that the fin projects on the surface of the tube, and moving the tube in the axial direction while rotating the tube, While feeding the fin member at a speed synchronized with the pipe material, the fin forming portion and the bent portion of the fin member are spirally wound around the pipe material, and then the bent tube material of the bent portion is bent to form a bent pipe portion. Is formed to form a finned tube, so that a finned tube can be obtained simply by winding a fin member having a fin formed by one-step pressing on a tube material, and productivity can be improved in a simple process. An excellent finned tube can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is a perspective view of a heat exchanger using one embodiment of a finned tube of the present invention.

FIG. 2 is a partially enlarged perspective view of a finned tube.

FIG. 3 is a plan view of a fin member.

FIG. 4 is a plan view of a curved tube portion of the finned tube.

FIG. 5 is a side view showing a rising state of the fin.

FIG. 6 is a perspective view showing a winding action of a fin member around a pipe material.

FIG. 7 is a perspective view of a conventional finned tube.

FIG. 8 is a perspective view of another conventional finned tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Finned pipe 14 Pipe material 15 Fin member 16 Straight pipe part 17 Curved pipe part 18 Fin formation part 19 Bent part 21 Fin

Claims (3)

(57) [Claims] 1. A pipe material in which a plurality of straight pipe sections are arranged in parallel, and a curved pipe section is provided between adjacent ends of the straight pipe sections so as to be transverse to the straight pipe sections. A finned tube having fins standing on the surface of a straight pipe portion of a pipe material, wherein the fins are formed in a thin and slender shape having a predetermined width and have U-shaped cut portions raised at a predetermined pitch. A fin member having a fin forming portion formed with a fin and a bent portion formed to have a width narrower than the fin forming portion following the fin forming portion. A finned tube wound around a tube portion, wherein the bent portion is wound around a curved tube portion of a tube material. 2. The finned tube according to claim 1, wherein the fin is divided into a plurality of fins, and each fin is formed at a different angle from the surface of the tube. 3. A fin member having a thin and long fin forming portion having a predetermined width and a bent portion having a narrower width than the fin forming portion are alternately formed in a longitudinal direction.
In the fin forming portion, after raising a U-shaped cut portion of a predetermined pitch to form a fin, abutting the fin member such that the fin projects from the surface of the tube material,
While rotating the tube material and moving it in the axial direction, the fin member and the bent portion of the fin member are spirally wound around the tube material while feeding the fin member at a speed synchronized with the tube material. A method for manufacturing a finned tube, comprising forming a bent tube portion by bending a turned tube material to form a finned tube.