KR100441125B1 - A Protrusion Forming Machine Of The Internal Tube Used For A Bimetal Tube - Google Patents

Abstract

SUMMARY OF THE INVENTION The present invention provides a projection forming apparatus for an inner tube, which is used for a composite tube that can quickly form a precise projection on an outer surface of an inner tube in a heat exchange composite tube having high corrosion resistance. To this end, the rotating means for rotating the drive shaft 30; The drive shaft 30 is integrally penetrated and rotatable, and an intermediate region is recessed in a semicircle to form a mold part 25, and a plurality of patterns are engraved on the surface of the mold part 25. ); Located adjacent to the first roller 20, the driven shaft 37 is integrally rotatable and rotatable, and the intermediate region is recessed in a semicircle to form a mold portion 25, the surface of the mold portion 25 A second roller 22 in which a plurality of patterns are engraved; When the inner tube 14 passes between the mold portion 25 of the first roller 20 and the mold portion 25 of the second roller 22, the second roller 22 passes through the first roller 20. Pressing means for pushing toward the side is provided.

Description

A Protrusion Forming Machine Of The Internal Tube Used For A Bimetal Tube}

The present invention relates to a fin heat exchanger through which a high temperature fluid flows, and more particularly, to a composite tube in which a cooling fin used for a heat exchanger is formed.

In general, the heat transfer rate of the heat exchanger is proportional to the surface area of the pipe or tube. Therefore, in order to increase the heat exchange of the pipe through which the fluid flows in a boiler, an air conditioner, a refrigerator, etc., a plurality of heat radiation fins are attached to the pipe surface.

However, there was a disadvantage in that corrosive liquids such as seawater (or seawater) flow easily inside the tube. In order to solve this disadvantage, a heat exchanger pipe using a composite tube has been introduced. Due to the characteristics of the composite pipe, the inner tube used a material having high corrosion resistance, and the exterior used a material having a low hardness and a high ductility to facilitate rolling.

1 is a front view of a composite pipe (or double tube, bimetal tube) 10 in which cooling fins are formed, and FIG. 2 is a cross-sectional perspective view of the composite tube illustrated in FIG. 1. 1 and 2, the inner tube 14 used a copper tube or copper alloy tube resistant to corrosion, and the outer tube 12 used an aluminum tube having high ductility. The surface of the exterior 12 is rolled to form a plurality of heat radiation fins 16 integrally.

The exterior 12 of the conventional composite tube 10 uses only ductile aluminum with low hardness and the inner tube 14 uses a copper tube, an iron tube, a stainless tube, etc. as needed. In the manufacturing process, the inner tube 14 necessary for the aluminum tube was inserted, and then the pins were formed on the outer surface 12 by a rolling process. In the process of forming the pin, the aluminum tube that is the outer appearance 12 is contracted to be in close contact with the inner tube 14. However, when applied to a heat exchanger, the conventional composite tube is heated to increase the temperature, so that the two metals expand relative to each other and the contact between the two metals becomes worse. This spacing acts as a heat transfer resistance that prevents heat transfer between the high temperature fluid and the heat dissipation fins 16, causing a decrease in the overall thermal efficiency.

Therefore, in order to solve this disadvantage, a plurality of protrusions 18 are regularly formed on the surface of the inner tube 14. The protrusion 18 serves to make the inner tube 14 and the outer surface 12 make an ideal metal contact because the protrusion 18 is in close contact with the inner diameter of the soft ductile appearance 12 while being partially deformed during the rolling process. When the contact area between the inner tube 14 and the outer surface 12 is large and the metal contact is made tightly, there is no or low contact resistance and the heat transfer coefficient is high, thereby realizing a high efficiency heat exchanger.

Therefore, there has been a constant demand for the development of a device capable of rapidly forming the precise projection 18 on the surface of the inner tube 14 in order to realize a high efficiency heat exchanger.

Accordingly, the present invention has been made to solve the above problems, the first object of the present invention is a composite tube for heat-resistant composite tube, which can quickly form a precise protrusion on the surface of the inner tube It is to provide a projection forming apparatus of the inner tube to be used.

A second object of the present invention is to form a projection in one direction and a projection in a direction crossing the surface of the inner tube to increase the contact area, reduce the contact resistance and minimize the relative thermal expansion of the inner tube used It is to provide a projection molding apparatus.

The object of the present invention as described above, the rotating means for rotating the drive shaft 30, the drive shaft 30 is integrally rotatable and rotatable, the intermediate region is recessed in a semi-circle to form a mold portion 25, the mold On the surface of the portion 25 is located adjacent to the first roller 20, the first roller 20 is formed with a plurality of patterns intaglio, the driven shaft 37 is integrally penetrating and rotatable, the intermediate region is Recessed in a semi-circular shape to form a mold portion 25, the surface of the mold portion 25 and the second roller 22 is formed with a plurality of patterns intaglio, and the mold portion 25 of the first roller 20 and A first forming apparatus composed of pressing means for pushing the second roller 22 toward the first roller 20 when the inner tube 14 passes between the mold portions 25 of the second roller 22; And a third roller 24 and a second roller 22 which are provided downstream of the first molding apparatus with respect to the direction in which the inner tube 14 is conveyed, and which correspond to the rotating means, the first roller 20. It is achieved by the projection forming apparatus of the inner tube used for the composite pipe, characterized in that the second roller forming apparatus consisting of a fourth roller 26 and the pressing means corresponding to the).

The rotation means may include a motor 40 that generates a rotational motion from electrical energy and an reducer 42 connected to the motor 40 and an output side connected to the drive shaft 30.

In addition, the pressing means is preferably a pair of hydraulic cylinder device 44 connected to both ends of the driven shaft 37, respectively.

A molding apparatus comprising the rotating means, the third roller 24 corresponding to the first roller 20, the fourth roller 26 corresponding to the second roller 22, and the pressing means includes the inner tube 14. It is preferable that one more set is provided with respect to the direction in which).

In addition, a pattern formed on the mold part 25 of the third roller 24 and the mold part 25 of the fourth roller 26 may be formed on the first roller 20 and the second roller 22. As a result, the protrusions 18 are preferably formed in a direction crossing the one-way protrusions 17 formed on the inner tube 14.

The pattern may have a depth in the range of 0.1 mm to 0.5 mm.

The inner tube 14 may be a copper tube or a copper alloy tube including copper.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and the preferred embodiments associated with the accompanying drawings.

1 is a front view of a composite pipe formed with a cooling fin;

Figure 2 is a cross-sectional perspective view of the composite tube shown in FIG.

3 is a schematic plan view of the projection forming apparatus of the inner tube used in the composite tube according to the present invention;

4 is a schematic front view of the projection forming apparatus of the inner tube used in the composite tube shown in FIG.

<Short Description of Main Reference Signs>

10: composite pipe, 12: appearance,

14: inner tube, 16: heat radiation fin,

17: one-way protrusion, 18: protrusion,

20: first roller, 22: second roller.

24: third roller, 25: mold portion,

26: fourth roller, 30: drive shaft,

32: driven shaft, 34: drive shaft bearing

36: driven shaft bearing, 40: motor,

42: reducer, 44: hydraulic cylinder

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, the configuration of the projection forming apparatus of the inner tube to be used in the composite tube according to the present invention will be described.

Figure 3 is a schematic plan view of the projection forming apparatus of the inner tube used in the composite tube according to the present invention. As shown in FIG. 3, the 1st roller 20 and the 2nd roller 22 are paired, and the 3rd roller 24 and the 4th roller 26 are provided in pair. That is, the inner tube 14 first passes through the first roller 20 and the second roller 22 in the direction of the arrow, and passes through the third roller 24 and the fourth roller 26 downstream.

The first roller 20 and the third roller 24 are drive rollers rotating in the direction of the arrow, and the second roller 22 and the fourth roller 26 are pressure rollers rotating in the direction of the arrow.

That is, the one-way protrusion 17 is formed on the surface of the inner tube 14 which has passed through the first roller 20 and the second roller 22, and then the third roller 24 and the fourth roller 26 are successively formed. The projection 18 is completed by passing through.

4 is a schematic front view of the projection forming apparatus of the inner tube used in the composite tube shown in FIG. As shown in Figure 4, the molding apparatus is largely composed of a roller, a pressing device, a rotating device and the like.

The first, second, third, and fourth rollers 20, 22, 24, and 26 are formed in a cylindrical shape, rotatable, and the intermediate region is recessed in a circular shape to form a mold part 25, which is the mold part 25. Is shaped to the outer surface of the inner tube (13). The mold portion 25 is formed with a number of hatched patterns, which have a depth in the range of about 0.1 mm to 0.5 mm. In addition, the pattern forms a left and right symmetry around the inner tube (14).

The first and third rollers 20 and 24 pass through the drive shaft 30 at the center of rotation, and both ends of the drive shaft 30 are supported by the bearing 34. One end of the drive shaft 30 is connected to the output side of the reducer 42, and the input side of the reducer 42 is connected to the motor 40.

In the second and fourth rollers 22 and 26, the driven shaft 37 passes through the center of rotation, and both ends of the driven shaft 37 are supported by the bearing 36. The 2nd, 4th rollers 22 and 26, the driven shaft 37, and the bearing 36 are comprised so that it can move by a predetermined distance in the horizontal direction. Both bearings 36 are provided with hydraulic cylinders 44 capable of reciprocating motion.

Hereinafter, the operation of the protrusion forming apparatus of the inner tube used in the composite tube having the above configuration will be described.

First, the motor 40 is rotated at high speed, and the reduction gear 42 is converted to low speed high torque. The converted rotational force is transmitted to the drive shaft 30 to rotate the first roller 20 and the third roller 24 in the direction of the arrow.

At this time, the inner tube 14 is transferred into the space formed by the pair of mold portions 25. Then, the hydraulic cylinder 44 is expanded to push the second roller 22 toward the first roller 20. Then, the first roller 20 and the second roller 22 are strongly pressed and rotated with the inner tube 14 interposed therebetween.

At this time, plastic deformation is performed on the surface of the inner tube 12 by the pattern engraved in the mold part 25, and the one-way protrusion 17 is molded as shown in FIG. 3.

In the same manner, as the inner tube 14 passes through the third roller 24 and the fourth roller 26, the protrusion is formed again on the one-way protrusion 17. At this time, the protrusion by the 3rd roller 24 and the 4th roller 26 is shape | molded in the direction crossing the direction of the one-way protrusion 17. As shown in FIG. Therefore, checkered or trapezoidal projections 18 are formed on the surface of the inner tube 14 passing through the third roller 24 and the fourth roller 26. These protrusions 18 will have a height in the range of about 0.1 mm to 0.5 mm.

In the present invention, as the inner tube 12, a copper tube or a white copper tube (90% copper, 10% nickel), a copper alloy tube, or an iron tube can be used.

In the present embodiment, two sets of molding apparatuses are illustrated and described, but the protrusions may be molded using one or three or more molding apparatuses as necessary.

In addition, the pattern formed in the mold portion of each roller can also be produced by applying a variety of patterns, such as dot pattern, corrugated pattern in addition to the hatched.

As described above, according to the projection forming apparatus of the inner tube used for the composite tube according to the present invention, in the heat exchange composite tube having strong corrosion resistance, it is possible to rapidly form a precise projection on the surface of the inner tube so that mass production is possible.

In addition, by forming a protrusion in one direction and a protrusion in a direction crossing the surface of the inner tube can increase the contact area to reduce the contact resistance. Therefore, there is a feature that can realize a high efficiency heat exchanger.

These advantages and effects have the advantage that the composite tube according to the present invention can be made smaller in appearance for the same performance.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it is possible to make various modifications or variations without departing from the spirit and scope of the invention. Accordingly, the appended claims will cover such modifications and variations as fall within the spirit of the invention.

Claims (7)

Rotating means for rotating the drive shaft 30, The drive shaft 30 is integrally penetrated and rotatable, and an intermediate region is recessed in a semicircle to form a mold part 25, and a plurality of patterns are engraved on the surface of the mold part 25. ), Located adjacent to the first roller 20, the driven shaft 37 is integrally rotatable and rotatable, and the intermediate region is recessed in a semicircle to form a mold portion 25, the surface of the mold portion 25 A second roller 22 in which a plurality of patterns are engraved, and When the inner tube 14 passes between the mold portion 25 of the first roller 20 and the mold portion 25 of the second roller 22, the second roller 22 passes through the first roller 20. A first forming apparatus composed of pressing means pushed toward the side; And The third roller 24 and the second roller 22 which are provided downstream of the first molding apparatus with respect to the direction in which the inner tube 14 is conveyed, and which correspond to the rotating means, the first roller 20. And a second forming apparatus composed of a fourth roller 26 corresponding to the pressing means and the pressing means. The pattern formed on the mold part 25 of the third roller 24 and the mold part 25 of the fourth roller 26 is formed by the first roller 20 and the second roller 22. The protrusion 18 is formed in a direction crossing the one-way protrusion 17 formed on the inner tube 14, The pattern forming apparatus of the inner tube used for the composite tube, characterized in that the pattern has a depth in the range of 0.1mm to 0.5mm. The method of claim 1, wherein the rotating means, the motor 40 for causing a rotational movement from electrical energy and Protrusion forming apparatus of the inner tube used for the composite pipe, characterized in that the input side is connected to the motor 40, the output side is composed of a reducer (42) connected to the drive shaft (30). The method of claim 1 or 2, wherein the pressing means, Protrusion forming apparatus of the inner tube used in the composite pipe, characterized in that the pair of hydraulic cylinder device (44) connected to both ends of the driven shaft (37), respectively. delete delete delete 2. The inner pipe protrusion forming apparatus according to claim 1, wherein the inner pipe (14) is a copper pipe.