JP3476092B2 - Heat transfer member and method of manufacturing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat transfer member such as a heat transfer tube or a heat transfer plate for heat exchange used in various industrial fields, and particularly to a large amount of conventional heat transfer tubes with fins or heat transfer plates. The present invention relates to a heat transfer tube or a heat transfer plate capable of improving heat transfer efficiency.

[0002]

2. Description of the Related Art Conventionally, a heat transfer tube or a heat transfer plate made of steel having good heat conductivity is generally used as a heat exchanger or heat exchange material for liquid-liquid, liquid-gas, gas-gas, etc. Has been done. But,
The exchange heat capacity is said to be determined by the temperature difference between each heat medium, the heat transfer coefficient, the heat transfer area, etc. Only use a material with high thermal conductivity when downsizing is required. Instead, fins or grooves are provided on the tube surface or plate surface to increase the heat transfer area, and by devising the fin structure, turbulent flow of the heat medium is generated to increase the heat transfer coefficient. Further, in Japanese Patent No. 1435526 and Japanese Patent Laid-Open No. 4-110597, there is a device for integrally molding or adhering a porous body or a foamed body of copper or a copper alloy to add these effects to further reduce the size. .

[0003]

However, Japanese Patent No. 1435
526 and Japanese Patent Application Laid-Open No. 4-110597, when a porous body or a foamed body of copper or a copper alloy is integrally molded or adhered,
In order to bond or adhere the pipe for transferring the heat medium and the foam, the former adopts the method of pouring and solidifying the molten metal into the foam shape mold, and the latter requires means such as crimping, brazing and plating. There is a problem that the manufacturing cost increases more than the required area increases, and the manufacturing process and equipment cost increase. In addition, these devices cannot achieve the intended effect because they cannot be integrally molded inside and outside the heat transfer tube at the same time, and the porous body or foam to be adhered has continuous voids of the same diameter, so that a constant turbulence effect cannot be obtained. Although it can be obtained, the larger effect cannot be obtained. The present invention is intended to solve such a problem, and provides a heat transfer member such as a heat transfer tube or a heat transfer plate having a structure capable of further increasing the heat transfer efficiency, and a manufacturing method thereof.

[0004]

DISCLOSURE OF THE INVENTION According to the present invention, a property and a metal plate that a copper oxide powder or a mixed powder of copper oxide powder and another metal such as nickel, aluminum, chromium, palladium and silver is sintered as a metal in a reducing atmosphere. If you do this above, you can obtain a heat transfer tube or heat transfer plate by integrally depositing a metal porous body with a three-dimensional mesh structure inside and outside the metal plate or metal tube by utilizing the property that it can be integrated with the metal plate. is there. 1 shows an example of the method of the present invention. The synthetic resin foam to which the adhesive is applied in advance is coated with copper oxide powder or a mixed metal powder of copper oxide and another metal powder in the gas phase, and then a copper plate coated with the same metal powder is used on one side or Laminate on both sides by lightly pressing with a roll press. At this time, the larger the amount of deposition on the synthetic resin foam and the copper plate, the stronger the sintering-bonding between the metal plate and the metal foam, and the more the unevenness on the metal plate increases, so that the thermal conductivity and the thermal conductivity are improved. An increase in thermal area can be obtained. Next, in a combustion furnace, the synthetic resin foam in this laminated body is burned down to obtain a metal foam having a skeleton of copper oxide or a metal alloy containing copper oxide on the copper plate. Further, this can be reduced and sintered in a reducing atmosphere such as a hydrogen reduction furnace to obtain a copper or copper alloy foam having a copper plate on one side or both sides. Here, this copper and copper alloy foam,
It can be used as it is as a material for heat transfer plates of heat exchangers, but when it is used as a heat transfer tube, it uses the property that the initial volume shrinks when the copper or copper alloy foam is reduced and sintered, that is, the copper plate. By utilizing the fact that there are surplus ends that are not covered with copper or copper alloy foam on the entire circumference of, the pipes with the ends in the same direction are rolled inward or outward by a method such as brazing or heat welding. It is possible to obtain a heat transfer tube in which a metal foam is adhered inside or outside the tube. Further, as shown in FIG. 2, the heat transfer tube having the metal foam adhered to the outside of the tube is formed by pressing the synthetic resin foam having the metal powder adhered thereto onto the copper tube having the same metal powder adhered thereto. It can be manufactured in a batch by burning-reducing and sintering like winding. On the other hand, the heat transfer tube with metal foam adhered to the inside of the tube is a synthetic resin foam with metal powder formed into a cylindrical shape, as shown in Fig. 3, and a copper tube with the same metal powder applied inside. They can be inserted so that they can be fitted together, and similarly manufactured in a batch. Here, the heat transfer tube in which the metal foam layer is simultaneously adhered to the inside and outside of the copper tube is manufactured in the same batch by performing the crimp winding outside the tube and the fitting insertion into the tube as shown in FIGS. 2 and 3. be able to. The heat transfer tube and the heat transfer plate coated with a plurality of layers of metal foam layers having different pore diameters are two or more kinds of synthetic resin foams having different pore diameters.
After applying the respective metal powders, lightly pressure-bonding them with a roll press or the like to form a laminated body, and incorporating it into a process suitable for the above-mentioned desired product. The metal powder is not limited to copper oxide powder or mixed metal powder of copper oxide and other metal powders,
The metal is appropriately selected according to the application.

[0005]

【Example】

Example 1 A synthetic resin foam having a thickness of 3 mm, a width of 5 cm, and a length of 20 cm.
Polyurethane foams (brand name Everlite SF, manufactured by Bliston Co.) a, b two types (a average pore size of 0.6 m)
m and b bubble average pore size 0.8 mm) was used. These polyurethane foams were coated with a pressure-sensitive adhesive to impart tackiness, and then dried. Next, these were inserted into copper oxide powder, rocked to be deposited in the gas phase, and then immersed in water and rocked to uniformly deposit the copper oxide powder on the skeleton of the polyurethane foam. A copper plate having a thickness of 0.8 mm (width and length have the same dimensions) was similarly applied with an adhesive to give adhesiveness, and then copper oxide powder was uniformly applied to the entire surface. Further, a copper tube having a thickness of 0.8 mm and an outer diameter of 10 mm was similarly treated and used.
First, the heat transfer plate was superposed on one side of polyurethane foam-a and lightly pressed on both sides of polyurethane foam-b, and then lightly crimped at 500 ° C. for 10 minutes in the atmospheric atmosphere, and then 900 ° C. 96% porosity in the process of sintering in a reducing atmosphere in hydrogen gas for 20 minutes
The heat transfer plates in which the metal foam was adhered to one surface and both surfaces of the copper plate to obtain an integrated heat transfer plate were obtained. 4a is a polyurethane foam-a, 4b is a polyurethane foam-b, 4c is a copper plate. Here, a heat transfer plate integrated with a copper plate coated with a multi-layered metallic copper foam is also obtained in the same step by stacking two or more foam-a or foam-a and foam b. I was able to. Further, the shrinkage ratio of the area of the metal copper foam on the copper plate obtained here was about 50%, and an end portion where the metal copper foam was not adhered was formed around the copper plate. Therefore,
In order to join the ends in the length direction, the heat transfer plate is roll-processed in the width direction and then brazed to adhere the metal copper foam inside and outside the copper pipe. 8 was obtained. Reference numeral 5 in FIGS. 7 and 8 is a brazing portion.

Example 2 Using the polyurethane foam-a and polyurethane foam-b of Example 1 and a copper tube, two types of heat transfer tubes were produced by depositing a metallic copper foam on the outside of the copper tube. One type is
Copper oxide powder and nickel fine powder (weight ratio of 10 to copper oxide powder)
%) Is laminated with the form b coated with the mixed powder, and the others are laminated with the form-a and the form-b coated with the mixed powder. Each of these is wrapped around a copper tube while being helically pressure-bonded, then burned and reduced and sintered in the same manner as in Example 1, and a metallic copper foam is adhered to the outside of the intended copper tube. ,
FIG. 10 was obtained. In FIGS. 9 and 10, 6 is a copper tube.

Example 3 Using the two polyurethane foam-a of Example 1 and a copper tube, a heat transfer tube was produced in which a metallic copper foam was adhered to the inside and outside of the copper tube. Two pieces of foam-a are coated with copper oxide powder, one of which is processed into a cylindrical shape with an outer diameter slightly larger than the inner diameter of the copper pipe, and inserted so that it fits inside the copper pipe. One of them was wound around a copper tube while helically pressure-bonding, and then burned and reduced and sintered in the same manner as in Example 1 to obtain a heat transfer tube shown in FIG. .

[0008]

According to the present invention, compared with the conventional heat transfer tube or heat transfer plate to which the foam made of copper or copper alloy is adhered, in terms of performance, the powders are used as the principle of coupling, that is, The metal foam and the heat transfer tube are strongly sintered to significantly improve the thermal conductivity.The multilayered structure and the multilayered structure make it possible to diffuse the flux of the heat transfer medium so that the heat transfer surface Turbulence increases and thermal conductivity also increases. Further, the conventional manufacturing method requires many steps and high processing accuracy, but in the present invention, the integrated heat transfer plate and heat transfer tube can be manufactured by an extremely simple process.

[Brief description of drawings]

FIG. 1 is a process drawing showing one manufacturing method of the present invention.

FIG. 2 is a process drawing showing one manufacturing method of the present invention.

FIG. 3 is a process drawing showing one manufacturing method of the present invention.

[Figure 4]

6 is a perspective view of the heat transfer plate obtained in Example 1. FIG.

[Figure 7] ~

8 is a cross-sectional view of the heat transfer tube obtained in Example 1. FIG.

FIG. 9

FIG. 10 is a perspective view of a heat transfer tube obtained in Example 2.

11 is a perspective view of a heat transfer tube obtained in Example 3. FIG.

[Explanation of symbols]

4a: Polyurethane foam-a 4b: Polyurethane foam-b 4c: Copper plate 5: Brazing part 6: Copper tube

─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Ken Yoshida 48 Wadai, Tsukuba City, Ibaraki Prefecture Hitachi Chemical Co., Ltd. Tsukuba R & D Laboratory (72) Inventor Yasuo Kamiwa 48 Wadai, Tsukuba City, Ibaraki Hitachi Chemical Co., Ltd. Company Tsukuba R & D Laboratories (72) Inventor Hidefumi Tsuboi 3-1, Kanda Surugadai, Chiyoda-ku, Tokyo 2 Hitachi Chemical Techno Plant Co., Ltd. (56) Reference JP-A-110597 (JP, A) (58) Survey Areas (Int.Cl. ⁷ , DB name) F28F 1/40

Claims (3)

(57) [Claims] 1. A metal powder-adhered synthetic resin foam obtained by vapor-depositing copper oxide powder or metal powder containing copper oxide powder on the skeleton of a synthetic resin foam, copper oxide powder or metal containing copper oxide powder. A method for manufacturing a heat transfer plate in which a copper plate coated with powder is laminated, then the synthetic resin foam is burned and removed in an oxidizing atmosphere, and then reduction sintering is performed in a reducing atmosphere. 2. A metal powder-adhered synthetic resin foam obtained by vapor-depositing copper oxide powder or metal powder containing copper oxide powder on the skeleton of a synthetic resin foam in the form of copper oxide powder or metal containing copper oxide powder. Wound while crimping on the outside of the copper tube to which the powder is adhered, make it into a cylindrical shape and insert it into the copper tube, or perform winding and fitting insertion inside and outside the copper tube at the same time, then synthesize in an oxidizing atmosphere A method for manufacturing heat transfer tubes in which resin foam is burned and removed, and then reduction sintering is performed in a reducing atmosphere. 3. A metal powder-deposited synthetic resin foam obtained by depositing metal powder in a vapor phase on a skeleton of a synthetic resin foam is laid on a member main body, and the synthetic resin foam is burned and removed to sinter the metal powder. A method for manufacturing a heat transfer member, which is a porous body and is made by integrating a metal porous body and a member body.