JP4703383B2 - Fin tube - Google Patents

Description

  The present invention is widely used in oil and fuel cooling pipes for automobiles and construction machinery, air conditioners that adjust the temperature and humidity of living spaces, refrigerators that preserve food freshness, and reaction towers in chemical facilities. This relates to the fin tube used.

  Conventionally, as in the inventions described in Patent Documents 1 and 2, polyamide (PA), an extrusion molding method, is used on the outer peripheral surface of a steel pipe, such as a zinc pipe or a chromate film, or a metal pipe such as an aluminum pipe. There is a fin tube provided with a thermoplastic resin film layer such as polypropylene (PP) or polyethylene (PE). Such conventional fin tubes prevent damage to the anticorrosion plating layer and metal pipes due to stepping stones, etc., due to the impact absorption capacity, water resistance, chemical resistance, etc. of the resin coating layer, and metal pipes due to mud splashes and chemicals. This prevented the oxidation of the fin tube and improved the corrosion resistance of the fin tube. However, the fin tubes described in Patent Documents 1 and 2 have a problem in terms of heat dissipation characteristics because the resin film layer is formed thick in order to improve impact resistance and corrosion resistance. It has been difficult to efficiently exchange heat between fluids that circulate.

Therefore, as in the invention described in Patent Document 3, a resin film layer having high corrosion resistance is provided on the outer peripheral surface of the metal tube, and a heat transfer body is provided on the outer peripheral surface of the resin film layer, and further on the outer peripheral surface of the heat transfer body. A resin-made fin member wound in a spiral shape is known.
Japanese Patent Laid-Open No. 8-188844 Japanese Patent Laid-Open No. 10-315295 JP 2004-101168 A

  However, since the fin member as shown in Patent Document 3 has a smooth surface, a larger surface area is required to further improve the heat dissipation of the fin tube. Further, since the fluid flowing on the surface of the fin member formed in this way is rectified, the boundary layer existing on the surface of the fin member becomes thick, and it has been difficult to sufficiently exert the heat exchange function by heat dissipation. .

  Accordingly, the present invention is intended to solve the above-described problems, and has a high corrosion resistance and a fin tube provided with a fin member having a surface area sufficient to enhance heat dissipation and a large number of long edges. Is going to get.

In order to solve the above-mentioned problems, the present invention winds a single wire in a spiral shape, and fixes one surface of the belt material to the outer portion of the spiral arranged on the tube member side when wound around the tube member. The fin member formed as described above is wound around the pipe member by bringing the other surface of the belt material into surface contact with the surface of the resin coating layer covering at least one layer of the outer peripheral surface of the pipe member .

  The fin member may be spirally wound around the surface of the resin coating layer.

  In addition, the fin member may be wound around the surface of the resin coating layer in a ring shape, and a plurality of fin members may be disposed at intervals in the axial direction of the tube member.

  Further, the fin member may be one in which an inner belt material is arranged on the inner side of a spiral arranged on the tube member side during winding.

  Further, the fin member may be one in which an inner fixed wire is disposed on the inner side of a spiral disposed on the tube member side during winding.

The present invention is configured as described above. By coating at least one resin coating layer on the outer peripheral surface of the pipe member, the corrosion resistance of the pipe member against a stepping stone or the like can be improved. In addition, by disposing the fin member formed by spirally winding a single wire on the resin coating layer, the surface area of the fin member can be easily increased and a large number of long edges are formed. As a result, a large turbulence or vortex is generated in the flow of fluid outside the pipe, and the boundary layer is peeled off. Therefore, it is possible to improve the heat dissipation and heat absorption of the fin tube by the large surface area and the many long edges.

A first embodiment of the present invention will be described with reference to FIG. 1. (1) is a fin member . The fin member (1) includes a spiral member (18) formed by winding a single wire (2) into a rectangular spiral shape. The outer part (8) is fixed to one surface of a thin and long belt material (13) continuously from one end to the other end by brazing or the like. The spiral member (18) is formed by winding it into a flat rectangular shape with a wire (2) such as stainless steel, aluminum, an aluminum base alloy, copper, a copper base alloy, or iron.

  The pipe member (3) for disposing the fin member (1) is made of zinc or zinc on the surface of a metal pipe (7) formed of stainless steel, aluminum, aluminum base alloy, copper, copper base alloy, iron or the like. The first plating layer (4) is formed by applying a system plating, and the surface of the first plating layer (4) is subjected to a hexavalent, preferably trivalent chromate treatment or upper plating to form a second plating layer. (5) is formed. The surface of the second plating layer (5) of the pipe member (3) is covered with a resin coating layer (6) by an extrusion molding apparatus or the like.

The resin coating layer (6), the polyamide of 12 and polyamide in the present embodiment 1 and the following examples 2,3 (PA), polypropylene (PP), be those formed of polyethylene (PE) or the like, Only one layer is arranged on the outer peripheral surface of the pipe member (3). The resin film layer (6) of the present invention can be used by appropriately combining these resins in addition to using PA, PP, PE and the like alone. In other different embodiments, the resin film layer (6) is not limited to a single layer, but can be disposed on a multi-layer pipe member (3). Thus, by covering the outer peripheral surface of the pipe member (3) with the resin film layer (6), the corrosion resistance of the pipe member (3) can be further improved.

In the present embodiment 1 and the following Examples 2 and 3, by performing chromate treatment to the surface of the first plating layer is to form a second plated layer (5), in other different embodiments The second plating layer (5) may be formed by performing a coating treatment instead of the chromate treatment. Further, nickel or a nickel base alloy may be plated as the first plating layer (4), and zinc or a zinc base alloy may be plated as the second plating layer (5). Further, the chromate treatment or the resin coating layer (6) may be used. An epoxy primer or the like may be provided in order to improve the adhesion to the substrate.

Further, in the present embodiment 1, and the following Examples 2 and 3, the metal tube as the first plating layer (7) (4) and the second plating layer (5) is provided tubular member (3) However, in other different embodiments, the outer periphery of the pipe member (3) consisting only of the metal pipe (7) without providing the first plating layer (4) and the second plating layer (5), etc. The resin film layer (6) may be directly coated on the surface. Thus, even when the pipe member (3) not provided with the first plating layer (4) or the second plating layer (5) is used, the resin film layer (6) is formed on the outer peripheral surface of the pipe member (3). The product excellent in corrosion resistance can be obtained by coating.

The pipe member (3) is pulled while pulling the belt member (13) in a state where the other surface of the belt member (13) to which the spiral member (18) is fixed is brought into surface contact with the surface of the resin film layer (6). ) Spirally. Thus, full fin member (1) in the form made a pin-like piece (10) becomes as being plural continuously helically disposed on the surface of the resin film layer (6). Therefore, the presence of the plurality of pin-like pieces (10) increases the surface area of the fin member (1) and forms a large number of long edges, greatly disturbing the flow of fluid outside the pipe of the pipe member (3). Since it can be generated and the boundary layer can be peeled off, heat dissipation can be improved.

The fin member (1) is attached to the pipe member (3) in a state where the belt member (13) of the fin member (1) is in close contact with the surface of the resin film layer (6) formed on the pipe member (3). It is winding. Then, the belt member (13) is wound by the elastic force of the resin film layer (6) provided on the pipe member (3) by winding the fin member (1) around the pipe member (3) while pulling the belt material (13). Slightly bites into the resin coating layer (6). Therefore, the other surface of the belt material (13) can be strongly and closely arranged on the surface of the resin film layer (6) without requiring any special fixing means such as adhesion, and the fin member (1) is connected to the pipe member (3 ) In a stable state, and heat from the pipe member (3) can be more reliably transmitted to the fin member (1) through the resin film layer (6). Become.

  Further, in Example 1, since the other surface of the belt material (13) is in surface contact with the resin film layer (6), the contact portion (12) bites into the resin film layer (6) uniformly. Become. Therefore, it becomes possible to arrange the fin member (1) on the pipe member (3) more stably. In addition, as described above, the belt member (13) is fixed in advance to the spiral member (18) to form the fin member (1), thereby improving the workability at the time of manufacture and enabling the work to be performed efficiently. It becomes.

Further, in the embodiment 1, the helix of the helical member (18) is in the outer portion (8) is arranged a belt material (13), in the second embodiment of the present invention, the helical member (18) An inner belt member formed in a thin plate shape and an elongated shape is disposed on the inner portion (14) of the spiral. That is, first, an inner belt material is arranged in advance on the spiral inner portion (14) of the spiral member (18) having a rectangular winding shape, and this inner belt material is placed on the inner portion (14) of the spiral member (18). And fixed by welding or brazing. Next, the spiral member (18) is spirally formed on the outer peripheral surface of the pipe member (3) in a state where the outer portion (8) of the spiral member (18) is in direct contact with the surface of the resin film layer (6). Wind it around.

Thus, the fin member (1) is more firmly attached to the pipe member (3) by arranging the inner belt member on the inner part (14) of the spiral of the spiral member (18) and winding it around the pipe member (3). It will be fixed to. Therefore, it becomes possible to arrange | position the fin member (1) to a pipe member (3) in the stable state. In addition, workability at the time of manufacture is improved, and work can be performed efficiently.

Further, in the embodiment 2, but are disposed inside the belt member to the inside of the helical fin members (1) (14), in the third embodiment of the present invention, flat oval winding shape An inner fixed wire is arranged on the inner side (14) of the spiral of the fin member (1) formed by the spiral member (18) having a shape. Thus, by turning up the inner fixed wire placement to the tube member (3) to the inner portion of the spiral fin members (1) (14), as in the case of Example 2, the fin member ( 1) can be fixedly arranged on the pipe member (3) more firmly. In addition, workability at the time of manufacture is improved, and work can be performed efficiently.

In addition, in another different Example, since it becomes possible to further improve heat conductivity by containing a carbon nanofiber in the resin film layer (6) used in the said Examples 1-3 , it is still more preferable. It becomes. Moreover, it is also possible to fix the fin member (1) to the resin film layer (6) of the pipe member (3) with an adhesive. In this case, since heat conductivity can be further improved by including carbon nanofibers in the adhesive, it is more preferable. Further, by using the adhesive as described above, heat from the resin film layer is easily transmitted to the fin member via the adhesive, so that it is possible to further improve the heat conductivity.

In another different embodiment, after the fin member (1) is wound around the pipe member (3) as shown in the first to third embodiments, the resin film layer (6) is replaced with the resin film layer (6 ) Is softened by heating to a temperature above the glass transition point of the resin constituting the resin and below the melting point, and the fin member (1) is deeply penetrated into the resin film layer (6) to be fused, and the fin member (1 The contact area between the contact portion (12) and the resin film layer (6) is further increased. In addition, after winding the fin member (1), the resin film layer (6) in contact with the fin member (1) is partially melted by heating to a temperature higher than the melting point of the resin, When the fin member (1) is fused to the resin film layer (6), the contact area between the contact portion (12) of the fin member (1) and the resin film layer (6) is increased, and the fin member (1) is This is more preferable because it can be more firmly fixed to the resin film layer (6). However, when fusing by heating above the melting point, care must be taken because the molten resin may flow out during the production and dripping may occur.

In the above embodiment 1-3, although the cross-sectional shape of the wire (2) as shown in FIG. 2 (a) and circular, in other different embodiments, as shown in FIG. 2, (b) elliptic An arbitrary shape such as a shape, (c) quadrangle, (d) triangle, (e) rhombus, (f) star shape, etc. may be used. Further, the winding shape of the helical member (18) to form the fin member (1), FIG. 3 in the above embodiments 1 to 3 (a), is set to如rather oval or rectangular as shown in (c) However, in other different embodiments, as shown in FIG. 3, an arbitrary winding shape such as (d) a square shape, (e) a substantially gourd shape, etc. may be used. In the above embodiment 1-3 has been described of the heat dissipation in the case of endothermic heat flow is reversed.

The fragmentary sectional view of the fin tube which shows Example 1 of this invention. Sectional view of the wire of an embodiment 1-3及 beauty of other and different embodiments of the present invention. Conceptual view of the winding shape of Example 1-3及 beauty other show a different embodiment the helical member of the present invention.

DESCRIPTION OF SYMBOLS 1 Fin member 2 Wire material 3 Pipe member 6 Resin film layer 8 Outer part 13 Belt material 14 Inner part

Claims (5)

A fin member formed by fixing one surface of the belt material to the outer side of the spiral that is wound on the tube member side when the wire member is wound spirally, and wound around the tube member. A fin tube , wherein the other surface of the belt material is brought into surface contact with the surface of the resin coating layer coated on at least one surface and wound around a pipe member .   The fin tube according to claim 1, wherein the fin member is spirally wound around the surface of the resin coating layer of the tube member.   2. The fin tube according to claim 1, wherein a plurality of fin members are wound around the surface of the resin coating layer of the tube member in a ring shape, and a plurality of fin members are disposed at intervals in the axial direction of the tube member. Fin member, the inner portion of the spiral is disposed in the pipe member side at the time of winding, according to claim 1, 2 or 3 of the fin tube, characterized in that a inner belt material. The fin tube according to claim 1, 2 or 3, wherein the fin member has an inner fixed wire disposed on an inner side of a spiral disposed on the tube member side at the time of winding.