JP2005140451A - Heat exchanger tube faced with fin member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger tube excellent in heat exchange performance and a strong circumferential fin excellent in impact resistance to a flying stone or the like and causing no bending or the like in the bending work of the heat exchanger tube by enhancing the adhesion between the circumferential fin and a metallic pipe to improve the mutual heat conductivity, and to provide a heat exchanger tube capable of being set even in a narrow space while keeping excellent heat exchange performance with increased durability by enabling the bending work of the heat exchanger pipe with a small bending radius. <P>SOLUTION: This heat exchanger tube is formed by spirally winding a steel-made strip fin member 3 having sacrificially corrosive anticorrosive plating layer 4 arranged on the whole surface on the circumferential surface of a metallic pipe 2 made of copper, aluminum, a copper-based alloy, or an aluminum-based alloy. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a heat transfer tube with an externally mounted fin member used in a fluid cooling tube of an automobile or a construction machine, a multi-tube heat exchanger such as an EGR gas cooling device, an air conditioner for adjusting the temperature and humidity of a residential space, and the like. Therefore, it is possible to improve the heat exchange performance of the heat transfer tube by improving the adhesion of the fin member, and to obtain a product excellent in impact resistance to a stepping stone and the like.

  Conventionally, as a heat exchanger tube used in a fluid cooling pipe of an automobile or a construction machine, a multi-tube heat exchanger such as an EGR gas cooling device, an air conditioner for adjusting the temperature and humidity of a residential space, and others, the following patent documents 1 to 3 As shown in FIG. 1, there is one in which a long metal fin member is spirally disposed on the outer periphery of a metal tube. With the exterior of the fin member, the heat transfer area of the heat transfer tube is increased and the heat release and absorption characteristics are enhanced, thereby improving the heat exchange performance between the fluid inside and outside the heat transfer tube. Further, an obstacle such as a large stepping stone is guarded by the fin member to prevent the metal tube from colliding and to prevent the metal tube from being damaged.

In addition, heat transfer tubes, especially those used for automobile underfloors and outdoor units, may be corroded by mud splashes, wind and rain, etc., so that highly reliable corrosion resistance is required as well as thermal conductivity. Therefore, copper, zinc, aluminum, etc. are often used as materials for metal pipes and fin members.
Japanese Patent Laid-Open No. 9-42573 JP-A-9-136111 JP-A-11-325778

  However, when a relatively soft strip-shaped fin member made of copper, zinc, aluminum, etc. is spirally wound around the outer periphery of the metal tube, the fin member has low tensile strength, so the metal of the fin member after winding is completed. The winding force around the outer periphery of the tube is relatively weak and is likely to sag. Accordingly, the fin member and the metal tube are hardly closely adhered to each other, and a gap is formed between the two, and the thermal conductivity between the metal tube and the fin member may be impaired. Further, the use of copper, zinc, aluminum or the like for the fin member makes the heat transfer tube expensive.

  In Patent Documents 1 to 3, a spiral groove is provided on the outer periphery of the metal tube, and one end of the fin member is fitted into the groove, thereby allowing contact between the fin member and the metal tube. However, when the width of the groove is wider than that of the fin member, the generation of a gap due to the slack of the fin member is unavoidable, and the labor for forming the groove in the metal tube is also required. Furthermore, in order to prevent a decrease in thermal conductivity due to the gap, it is necessary to close the gap between the fin member and the metal pipe by welding, brazing, or the like, and the work process is complicated and it is difficult to improve the production efficiency.

  In addition, the heat transfer tube is required to have not only corrosion resistance but also shock resistance because obstacles such as stepping stones are likely to collide by being disposed under the floor of an automobile or in an outdoor unit. However, fin members made of copper, zinc, aluminum, etc. have poor impact resistance against collisions with large stepping stones and curbs, and may be damaged. Due to the breakage of the fin member, a stepping stone or the like may reach the metal tube and break the metal tube, which may impair the durability of the heat transfer tube.

  Furthermore, in the fin member made of copper, zinc, aluminum, etc., when bending the heat transfer tube, the fin member is easily crushed between the metal tube and the bending roll, and a large force is applied to the bending process. Can not be bent only with a large bending radius. For this reason, it is difficult to install in a narrow space such as under the floor. In recent years, there has been a demand for downsizing and weight reduction of automobiles, construction machinery, air conditioners, etc. However, if a conventional heat transfer tube that can be bent only with a large bending radius is provided, the compactness of the product will be reduced. There was a limit to making it lighter and lighter.

  In order to solve the problems as described above, the present invention uses a strong steel-made fin member and spirally arranges it on the outer periphery of the metal tube with a strong winding force, thereby reducing the slack of the fin member. It is possible to improve the adhesion between the metal tube and the fin member. Thereby, the heat conductivity between the metal tube and the fin member is improved, and a heat transfer tube excellent in heat exchange performance is obtained. In addition, when bending heat transfer tubes, the fin member does not bend and the like, and it is possible to easily perform bending with a small bend radius, enabling layout in a narrow space such as under the floor. To obtain an excellent heat transfer tube. Further, the stepping stones are reliably guarded by the fin member, the effect of preventing the metal tube from being damaged is improved, and the excellent heat exchange performance of the heat transfer tube can be maintained.

  In order to solve the above-described problems, the present invention provides a steel strip-like fin member in which a sacrificial corrosion-resistant corrosion-resistant plating layer is disposed on the entire surface of copper, aluminum, a copper-based alloy, or aluminum. A fin member characterized by being spirally wound around an outer peripheral surface of a metal tube made of a base alloy is formed.

  In addition, the second invention is a steel strip-like fin member formed by slitting a steel plate having a sacrificial corrosion-resistant corrosion-resistant plating layer on the entire surface to a desired width, and is made of copper, aluminum, copper base A metal tube made of an alloy or aluminum base alloy is spirally wound around the outer peripheral surface.

  The present invention is configured as described above, and a fin member made of steel having a higher tensile strength than that of a metal tube is spirally arranged on the outer periphery of a metal tube made of copper, aluminum, a copper base alloy or an aluminum base alloy. By installing the fin member, it is difficult to cause the fin member to loosen, and the fin member can be disposed in close contact with the outer periphery of the metal tube with a strong wrapping force, thereby preventing the occurrence of a gap between the fin member and the metal tube. I can do things. Thus, even if it is a steel fin member with low heat conductivity compared with aluminum, copper, etc., heat conductivity between a fin member and a metal pipe increases, and heat conductivity increases by improving adhesion. The heat exchange performance of the heat transfer tube can be improved because the metal tube made of copper, aluminum, copper base alloy or aluminum base alloy is used. Also, by making it steel, it is possible to obtain highly reliable impact resistance of the fin member, and it is possible to reliably guard obstacles such as stepping stones and prevent damage to the metal pipe, Increases durability and maintains excellent heat exchange performance.

  In addition, even when a strong bending force is applied during bending of the heat transfer tube, the steel fin member is unlikely to be bent and can be easily bent at a small bending radius. Therefore, it is possible to obtain a heat transfer tube excellent in layout that can be easily installed even in a narrow space such as under the floor or the back of various devices. Further, by making the fin member made of steel, an inexpensive product can be obtained as compared with a heat transfer tube formed entirely of copper, aluminum, a copper base alloy or an aluminum base alloy.

  By using such heat transfer tubes with excellent heat exchange performance, durability, and layout properties, fluid cooling tubes for automobiles and construction machinery, air conditioners that adjust the temperature and humidity of residential spaces, heat absorption and dissipation by various pipes, etc. The heat exchange performance and durability of industrial, heating, hot water supply, and other multi-tube heat exchangers can be improved, and these products can be made compact.

  Example 1 of the heat transfer tube of the present invention will be described in detail with reference to FIGS. 1 to 3. (1) is a heat transfer tube, a metal tube made of copper, aluminum, a copper base alloy or an aluminum base alloy (2 ) A steel strip-like fin member (3) is spirally arranged on the outer periphery.

  Thus, by making the metal pipe (2) made of copper, aluminum, a copper base alloy or an aluminum base alloy, it has excellent corrosion resistance against wind and rain, mud splash, and others. The fin member (3) uses a steel plate, so that a strong wrapping force when disposed on the outer periphery of the metal tube (2) and a highly reliable durability against an impact such as a stepping stone can be obtained. Further, due to the impact resistance of the fin member (3), even the relatively soft metal pipe (2) can be prevented from being damaged well, and a highly durable heat transfer pipe (1) can be obtained. it can.

  Moreover, in Example 1, when producing the fin member (3), the steel plate is formed by slitting to a desired formation width. This steel plate is used in a concept including a wide flat steel plate, a steel plate processed into a strip shape, and the like. Then, as shown in FIG. 3, zinc, zinc-aluminum is formed on the entire outer surface of the slit fin member (3), that is, on both surfaces and both side end surfaces in the width direction, more preferably on the front end surface and the rear end surface in the length direction. The sacrificial corrosion-resistant corrosion-resistant plating layer (4) is provided by subjecting an alloy or the like to hot-dipping treatment or plating treatment of zinc-nickel alloy, zinc-iron alloy, zinc-cobalt alloy or the like. By using the fin member (3) provided with the sacrificial corrosion-resistant corrosion-resistant plating layer (4) and the metal tube (2) made of copper, aluminum, copper-base alloy or aluminum-base alloy, the heat transfer tube (1) is severe. Reliable corrosion resistance that can be used in corrosive environments.

  And when arrange | positioning the said fin member (3) helically on the outer periphery of a metal pipe (2), it winds, applying a strong deformation force so that slack of a metal material may not be produced. Since the steel fin member (3) of the present invention has good shape retention after deformation, a gap is formed between one end face of the fin member (3) and the outer peripheral surface of the metal tube (2). In addition, the steel fin member (3) wraps around the surface of the relatively soft metal tube (2), and the fin member (3) has a strong wrapping force around the outer periphery of the metal tube (2). It will be wrapped around. Therefore, the adhesion between the fin member (3) and the metal tube (2) is increased, and the steel fin member (3) has a slightly lower thermal conductivity than conventional fins made of aluminum or copper. However, the heat conductivity between the fin member (3) and the metal tube (2) can be increased, and the heat transfer tube (1) having heat conductivity not inferior to that of aluminum or copper products can be obtained. It is possible to obtain an inexpensive product by reducing the material cost.

  Further, due to this strong winding force that does not cause loosening, it is not necessary to braze or weld the entire contact surface between the fin member (3) and the metal tube (2), and the fin member (3) and the metal tube (2) High adhesion can be maintained and high thermal conductivity can be maintained.

  In addition, the steel fin member (3) is robust when bending the heat transfer tube (1) for placement in a limited space, such as under the floor or on the back of the equipment, and is shown in FIG. Thus, even when a strong bending force is applied during bending by the bending roll (5), the fin member (3) is not easily crushed between the metal tube (2) and the bending roll (5), and the heat transfer tube (1 ) Can be bent with a desired bending radius. Therefore, the heat transfer tube (1) excellent in layout property that can be installed even in a narrow place such as under the floor or equipment can be obtained.

  In the first embodiment, as shown in FIG. 3, by providing a sacrificial corrosion-resistant corrosion-resistant plating layer (4) over the entire outer surface of the fin member (3), the fin member (3) has a highly reliable corrosion resistance. Have gained. On the other hand, in Example 2, as shown in FIG. 4, the corrosion-resistant plating layer (4) is provided only on both surfaces of the fin member (3), and the corrosion-resistant plating layer (4) is provided on both side end surfaces in the width direction. Not. Such a fin member (3) is prepared by slitting a wide steel plate, which has been subjected to sacrificial corrosion plating treatment over the entire surface, at regular intervals according to the width dimension of the fin member (3). Forming. In the fin member (3) obtained by such a process, the corrosion-resistant plating layer (4) is provided on both side surfaces, but the end surface in the width direction is not subjected to any plating treatment, and the steel surface Is exposed to the outside.

  However, even with such a fin member (3), the steel exposed from the end surface in the width direction is satisfactorily prevented from being corroded by the sacrificial corrosion action of the corrosion-resistant plating layers (4) provided on both surfaces. Even in the heat transfer tube (1) of the second embodiment, highly reliable corrosion resistance can be obtained. And, since the pre-plated steel plate can be used and the labor of plating the fin member (3) can be saved, the production process and material cost of the heat transfer tube (1) can be saved, and the productivity can be reduced. Can be improved.

  FIG. 5 shows an example in which the heat transfer tube (1) of the present invention of Examples 1 and 2 and the like is disposed and used as an automobile fuel pipe on the underfloor panel (6). As described above, the heat transfer tube (1) of the present invention can be easily bent with a small bending radius without damaging the fin member (3). Therefore, even if it is a long distance from the fuel tank (7) to the engine (8), it can be arranged in a narrow space while avoiding other underfloor equipment (not shown), and the layout is excellent. . Further, since the heat exchange performance of the heat transfer tube (1) is enhanced by the arrangement of the fin member (3), the heat of the fuel flowing in the heat transfer tube (1) is transferred to the outside air through the heat transfer tube (1). It is possible to efficiently dissipate heat. Therefore, since a high cooling effect on the fuel can be obtained, there is no need to separately provide a fuel cooling means such as a cooler unit, and the number of parts can be reduced and the manufacturing cost of the automobile can be reduced. In addition, the steel fin member (3) has excellent impact resistance to stepping stones, etc., and the corrosion-resistant plating layer (4) also has excellent corrosion resistance to mud splashes and wind and rain. Even if it is arrangement | positioning, it becomes possible to obtain the high durability of a heat exchanger tube (1), and to maintain the outstanding heat exchange performance.

  FIG. 6 shows an example in which the heat transfer tube (1) of Example 1 or Example 2 is assembled and used in the multi-tubular cylindrical heat exchanger (10). In this multi-tube cylindrical heat exchanger (10), a pair of tube sheets (12) are connected to both ends of a cylindrical trunk tube (11) so that the inside can be sealed. And between the pair of tube sheets (12), a plurality of the heat transfer tubes (1) of the present embodiment are connected through the tube sheet (12). A bonnet (16) provided with an inlet (14) and an outlet (15) for the cooled high-temperature heat medium fluid is connected to both ends of the trunk pipe (11).

  Furthermore, by providing an inlet (17) and an outlet (18) for the low-temperature heat medium fluid on the outer periphery of the trunk pipe (11), the airtight space partitioned by the pair of tube sheets (12) A cooling section (13) through which the heat medium fluid can flow is provided. In addition, a plurality of support plates (20) are joined and arranged in the cooling section (13), and the insertion holes (21) provided in the support plates (20) are linearly arranged in the first or second embodiment. By inserting the heat transfer tube (1), the heat transfer tube (1) is stably supported as a baffle plate, and the flow of the low-temperature heat medium fluid flowing in the cooling section (13) is meandered.

  In the multi-tubular cylindrical heat exchanger (10), when a high-temperature heat medium fluid is introduced into the trunk pipe (11) from the introduction port (14), the high-temperature heat medium fluid is introduced into the trunk pipe (11). Into a plurality of heat transfer tubes (1). In the cooling section (13) in which the heat transfer tube (1) is arranged, a low temperature heat medium fluid is circulated outside the heat transfer tube (1) in advance, so that the heat transfer tube (1) excellent in heat exchange performance of the present invention is provided. Heat exchange is efficiently performed between the high-temperature heat medium fluid and the low-temperature heat medium fluid via the outer surface.

  In the above, a plurality of linear heat transfer tubes (1) are arranged in the cooling section (13). However, as another different embodiment, one or a plurality of heat transfer tubes (1) are bent. You may process and arrange | position in a cooling part (13). Since the heat transfer tube (1) of the present invention can be bent with a small bending radius as described above, it is easy to store in the trunk tube (11), and the diameter of the multi-tube cylindrical heat exchanger (10) is increased. Can be suppressed.

  Thus, by using the heat transfer tube (1) of the present invention, it is possible to improve the quality of products such as fluid cooling tubes of automobiles and construction machinery, and air conditioners that adjust the temperature and humidity of residential spaces. In addition, since excellent heat exchange performance can be obtained, these products can be miniaturized, and the layout can be installed in a narrow space with a high degree of freedom.

The perspective view of the heat exchanger tube of Example 1 of this invention. The top view which shows the bending process process of a heat exchanger tube. FIG. 3 is an enlarged cross-sectional view of the vicinity of a close contact portion between the fin member and the metal tube according to the first embodiment. The expanded sectional view of the contact part vicinity of the fin member of Example 2 and a metal pipe. The piping diagram of the fuel delivery pipe which uses the heat exchanger tube of this invention. Schematic of a multi-tube cylindrical heat exchanger using the heat transfer tube of the present invention.

Explanation of symbols

1 Heat Transfer Tube 2 Metal Tube 3 Fin Member 4 Corrosion Resistant Plating Layer

Claims (2)

The fact that a steel strip fin member with a sacrificial corrosion-resistant plating layer on the entire surface is spirally wound around the outer peripheral surface of a metal tube made of copper, aluminum, copper base alloy or aluminum base alloy. A heat transfer tube with a featured fin member. A steel strip fin member formed by slitting a steel plate with a sacrificial corrosion-resistant corrosion-resistant plating layer on the entire surface to the desired width, and made of copper, aluminum, copper-base alloy or aluminum-base alloy metal A heat transfer tube having a fin member that is wound around the outer peripheral surface of the tube in a spiral shape.

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