KR102057638B1 - Internal tube pipe enlargement device for heat exchanger - Google Patents

Abstract

The present invention relates to a tube expansion device for heat exchangers. An inner tube is pushed into a fin tube to preassemble the same firstly. When an expansion jig is pushed into the assembled inner tube, the inner tube is expanded and the outer circumferential surface of the inner tube comes in contact with the inner circumferential surface of the fin tube. Accordingly, the fin tube and the inner tube are combined without additional welding, and the fin tube and the inner tube are tightly fixed without a gap, thereby facilitating efficient heat exchange.

Description

Internal tube pipe enlargement device for heat exchanger

The present invention relates to an inner tube expansion device for a heat exchanger, and more particularly, a combination of a fin tube and an inner tube is made without additional welding, and the fin tube and the inner tube are closely adhered to each other to maximize heat transfer efficiency. It relates to an expansion device.

The cryogenic gas vaporizer converts liquid cryogenic gases such as LNG (liquefied natural gas) and industrial gases (liquefied oxygen, liquefied nitrogen, liquefied argon, and liquefied carbon dioxide) from 50 degrees below zero to 200 degrees below zero. In order to improve the heat exchange performance of the device, a tube of aluminum alloy steel is mainly used. This is mainly applied to the design pressure below 20MPa. When the use or design pressure exceeds 50MPa, due to the limitations of tensile and yield strength of aluminum alloy steel, double tubes with stainless steel or copper alloy steel inserted into aluminum tubes are used.

In order to insert the high pressure inner tube into the fin tube for heat exchange, a certain interval (gap) is required. When inserting the inner tube for heat exchange, use hammer or special tool made of soft material such as wood or rubber. The spacing required for smooth insertion is limited to within 10% of the maximum expansion (expansion) potential using the coefficient of expansion and Poisson's ratio of the high-pressure tube for heat exchange.

If the gap (gap) used for inserting the inner tube is left as it is, the efficiency of the heat exchanger will be significantly reduced, and the gap between the heat exchanger fin tube and the inner tube inserted into the inner tube may not be possible. There is a need to maximize the efficiency of the heat exchanger by reducing the gap as much as possible.

Republic of Korea Patent No. 10-1877556

An object of the present invention for solving the above problems, the fin tube and the inner tube is made without a separate welding, the fin tube and the inner tube is a tube for the heat exchanger so that efficient heat exchange can be made by tightly fixed without gaps To provide a pipe expansion device.

Another object of the present invention, when the inner tube is expanded by the expansion jig, the outside of the inner tube is pushed into the scratch groove of the fin tube, so that the contact area between the fin tube and the inner tube to increase the tube tube expansion device for heat exchanger To provide.

Still another object of the present invention is that the inner tube and the pin tube can be easily pre-assembled and assembled without a separate tool, and when the inner tube is expanded by the expansion jig, the outer portion of the inner tube is filled with the female threaded portion of the pin tube. SUMMARY OF THE INVENTION An object of the present invention is to provide a tube tube expansion device for a heat exchanger in which a contact area between a tube and an inner tube is increased.

Still another object of the present invention is to provide a tube tube expansion apparatus for a heat exchanger that can increase heat dissipation efficiency of a fin tube.

Still another object of the present invention is to provide a tube tube expansion apparatus for a heat exchanger, which facilitates the expansion of the inner tube.

The heat exchanger inner tube expansion device of the present invention for achieving the above object, the expansion pipe jig so that the inner tube is in close contact with the inner surface of the fin tube by moving the inner tube inserted into the fin tube; A expansion rod connected to the expansion jig so that the expansion jig moves along the passage of the inner pipe to expand the inner pipe; The edge portion of the expansion jig is characterized in that the tapered surface is formed to push the inner peripheral surface of the inner tube to the outside when the expansion jig is moved.

Another feature of the inner tube expansion device for the heat exchanger of the present invention, the expansion tube jig to expand the inner tube while moving the inner tube inserted into the fin tube so that the inner tube is in close contact with the inner surface of the fin tube; A expansion rod connected to the expansion jig so that the expansion jig moves along the passage of the inner pipe to expand the inner pipe; The tapered surface is formed in the corner portion of the expansion jig to push the inner circumferential surface of the inner tube outward when the expansion jig is moved; Scratch grooves are formed on the inner circumferential surface of the fin tube, and when the inner tube is expanded by the expansion jig, the outside of the inner tube is pushed into the scratch groove of the fin tube so that the contact area between the fin tube and the inner tube is increased. It features.

Another feature of the inner tube expansion device for the heat exchanger of the present invention, the expansion tube jig to expand the inner tube while moving the inner tube inserted into the fin tube so that the inner tube is in close contact with the inner surface of the fin tube; A expansion rod connected to the expansion jig so that the expansion jig moves along the passage of the inner pipe to expand the inner pipe; The tapered surface is formed in the corner portion of the expansion jig to push the inner circumferential surface of the inner tube outward when the expansion jig is moved; A female thread part is formed on the inner circumferential surface of the fin tube, and a male thread part is formed on the outer circumferential surface of the inner tube. When the inner tube and the fin tube are first assembled, the male thread part of the inner tube and the female thread part of the pin tube are assembled by screwing. When the inner tube is expanded by the expansion jig, the outside of the inner tube is pushed into the female threaded portion of the fin tube, and the contact area between the fin tube and the inner tube is increased while the outer tube is filled with the female threaded portion of the fin tube. It is characterized by.

Another feature of the inner tube expansion device for the heat exchanger of the present invention, the expansion tube jig to expand the inner tube while moving the inner tube inserted into the fin tube so that the inner tube is in close contact with the inner surface of the fin tube; A expansion rod connected to the expansion jig so that the expansion jig moves along the passage of the inner pipe to expand the inner pipe; The tapered surface is formed in the corner portion of the expansion jig to push the inner circumferential surface of the inner tube outward when the expansion jig is moved; Around the fin tube is coated with a heat radiation coating agent consisting of an infrared emitter powder and a binder, the infrared emitter powder is jade, cerite, cordierite, germanium, iron oxide, mica, manganese dioxide, silicon carbide, macsumite, carbon, copper oxide, Cobalt oxide, nickel oxide, antimony pentoxide, tin oxide, chromium oxide, boron nitride, aluminum nitride and silicon nitride, any one or a mixture of two or more thereof, the binder is formed of an organic-inorganic hybrid binder, the organic-inorganic hybrid binder Is formed by mixing 0.1 to 150 parts by weight of silane or 0.1 to 150 parts by weight of organic resin with respect to 100 parts by weight of colloidal inorganic particles; The colloidal inorganic particles may be any one or a mixture of silica, alumina, magnesium oxide, titania, zirconia, tin oxide, zinc oxide, barium titanate, zirconium titanate and strontium titanate; A primer treatment is performed between the fin tube and the heat dissipating coating agent, and the primer treatment is performed using any one of a silane, an organic resin, a silicone compound, an inorganic binder, an organic / inorganic hybrid binder, and glass frit; A protective layer is further formed on the surface of the heat dissipating coating agent, and the protective layer is made of any one material of a silane, an organic resin, a silicon compound, an inorganic binder, an organic / inorganic hybrid binder, and glass frit. .

According to still another feature of the heat exchanger inner tube expansion apparatus according to the present invention, the tapered surface has an inclination of 15 ° to 35 ° with respect to the outer circumferential surface of the expansion jig.

In the present invention as described above, the inner tube is pushed into the inner tube by primary assembly, and when the expansion tube jig is pushed into the assembled inner tube, the inner tube is expanded while the outer peripheral surface of the inner tube is in close contact with the inner peripheral surface of the fin tube. Accordingly, the fin tube and the inner tube are combined without additional welding, and the fin tube and the inner tube are tightly fixed without any gap, thereby making efficient heat exchange.

In the present invention, scratch grooves are formed on the inner circumferential surface of the fin tube. Therefore, when the inner tube is expanded by the expansion jig, the outside of the inner tube is pushed into the scratch groove of the fin tube, thereby increasing the contact area between the fin tube and the inner tube, thereby increasing the heat transfer efficiency between the inner tube and the fin tube. Is maximized.

In addition, a female screw portion is formed on the inner circumferential surface of the fin tube, and a male screw portion is formed on the outer circumferential surface of the inner tube. Therefore, when assembling the inner tube and the fin tube primarily, the male screw portion of the inner tube and the female thread portion of the pin tube are assembled by screwing. Therefore, no separate tool is required for primary preassembly of the inner tube and the fin tube, and can be preassembled with a simple operation of screw assembly. When the inner tube is expanded by the expansion jig, the outside of the inner tube is filled to the female thread portion of the fin tube while the outer portion of the fin tube is pushed into the outer portion. Therefore, the contact area between the fin tube and the inner tube is increased, thereby maximizing the heat transfer efficiency between the inner tube and the fin tube.

In addition, the present invention, while using the existing fin tube as it is, a heat radiation coating agent of high emissivity is coated on the fin tube surface. Therefore, by increasing the emissivity of the fin tube surface, the heat is released well by radiation along with the convection on the existing fin tube surface, thereby improving heat dissipation efficiency, and it can be applied to all types of fin tubes of various types. The effect is improved.

And the tapered surface of the expansion jig of this invention has the inclination of 15 degrees-35 degrees with respect to the outer peripheral surface of an expansion jig. If the tapered surface of the expansion jig has an inclination of less than 15 ° with respect to the outer circumference of the expansion jig, the angle of inclination of the tapered surface is so small that the inner circumferential surface of the inner tube is not pushed properly, thus delaying the expansion work and improving the efficiency of the work. Falls. If the tapered surface of the expansion jig has an inclination exceeding 35 ° with respect to the outer circumference of the expansion jig, the inner circumference of the inner tube cannot be pushed smoothly to the outer circumference of the expansion jig, and a part of the inner surface of the inner tube is damaged or torn off. It also occurred. Therefore, the tapered surface of the expansion jig has an inclination of 15 ° to 35 ° with respect to the outer circumferential surface of the expansion jig, so that the expansion of the inner tube can be smoothly performed.

1 is a schematic partial cross-sectional view showing a first embodiment of the tube tube expansion apparatus for heat exchangers of the present invention
Figure 2 is a schematic partial cross-sectional view showing a second embodiment of the tube tube expansion device for heat exchangers of the present invention
Figure 3 is a schematic partial cross-sectional view, side view and excerpt front view showing a third embodiment of the tube tube expansion device for heat exchanger of the present invention
Figure 4 is a schematic partial cross-sectional view showing a fourth embodiment of the tube tube expansion device for heat exchangers of the present invention
Figure 5 is a schematic partial cross-sectional view showing a fifth embodiment of the tube tube expansion device for heat exchange of the present invention

Specific features and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings.

As the inventive concept allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed form, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the drawings, similar reference numerals are used for similar elements. In the accompanying drawings, the dimensions of the structures are shown in an enlarged scale than actual for clarity of the invention.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described on the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

1 is a schematic partial sectional view showing a first embodiment of a tube tube expansion device for a heat exchanger of the present invention.

The tube tube expansion device for a heat exchanger of the present invention comprises an expansion pipe jig 10 and an expansion pipe rod 12. The expansion tube jig 10 expands the inner tube 2 while moving the inner tube 2 inserted into the fin tube 1 so that the inner tube is in close contact with the inner circumferential surface of the fin tube 1. The expansion pipe 12 is connected to the expansion jig 10 so that the expansion jig 10 moves along the passage of the inner pipe 2 to expand the inner pipe 2.

A tapered surface 11 is formed at the corner of the expansion jig 10 to push the inner circumferential surface of the inner tube 2 outward when the expansion jig 10 moves.

The tapered surface 11 of the expansion jig 10 of the present invention has an inclination of 15 ° to 35 ° with respect to the outer circumferential surface of the expansion jig 10. If the tapered surface 11 of the expansion jig 10 has an inclination of less than 15 ° with respect to the outer circumferential surface of the expansion jig 10, the inclined surface angle of the tapered surface 11 is so small that the inner peripheral surface of the inner tube 2 is pushed properly. As a result, the work efficiency is reduced, such as delayed expansion work.

If the tapered surface 11 of the expansion jig 10 has an inclination exceeding 35 ° with respect to the outer peripheral surface of the expansion jig 10, the inner circumferential surface of the inner tube 2 is not smoothly pushed to the outer peripheral surface of the expansion jig 10. , Some of the inner surface of the inner tube (2) is damaged or torn off problems have occurred. Therefore, since the tapered surface 11 of the expansion jig 10 has the inclination of 15 degrees-35 degrees with respect to the outer peripheral surface of the expansion jig 10, expansion operation of the inner pipe 2 is performed smoothly.

This tube tube expansion device for heat exchanger of the present invention can be operated by connecting the drawing hydraulic cylinder to the expansion rod 12, it may be used by mounting the expansion jig 10 to the hydraulic cylinder provided with the expansion rod (12). have.

Since the present invention has a structure in which the inner tube 2 is expanded when drawn, the tapered surface 11 is formed at the left edge of the expansion jig 10. Therefore, in the present invention, when the expansion pipe 12 is drawn out, the expansion pipe jig 10 pulls the inner pipe 2 and the inner pipe 2 is in close contact with the inner circumferential surface of the fin tube 1.

Figure 2 is a schematic partial cross-sectional view showing a second embodiment of the tube tube expansion apparatus for heat exchangers of the present invention.

The tube tube expansion device for a heat exchanger of the present invention comprises an expansion pipe jig 10 and an expansion pipe rod 12. The expansion tube jig 10 expands the inner tube 2 while moving the inner tube 2 inserted into the fin tube 1 so that the inner tube is in close contact with the inner circumferential surface of the fin tube 1. The expansion pipe 12 is connected to the expansion jig 10 so that the expansion jig 10 moves along the passage of the inner pipe 2 to expand the inner pipe 2.

A tapered surface 11 is formed at the corner of the expansion jig 10 to push the inner circumferential surface of the inner tube 2 outward when the expansion jig 10 moves.

The tapered surface 11 of the expansion jig 10 of the present invention has an inclination of 15 ° to 35 ° with respect to the outer circumferential surface of the expansion jig 10. If the tapered surface 11 of the expansion jig 10 has an inclination of less than 15 ° with respect to the outer circumferential surface of the expansion jig 10, the inclined surface angle of the tapered surface 11 is so small that the inner peripheral surface of the inner tube 2 is pushed properly. As a result, the work efficiency is reduced, such as delayed expansion work.

If the tapered surface 11 of the expansion jig 10 has an inclination exceeding 35 ° with respect to the outer peripheral surface of the expansion jig 10, the inner circumferential surface of the inner tube 2 is not smoothly pushed to the outer peripheral surface of the expansion jig 10. , Some of the inner surface of the inner tube (2) is damaged or torn off problems have occurred. Therefore, since the tapered surface 11 of the expansion jig 10 has the inclination of 15 degrees-35 degrees with respect to the outer peripheral surface of the expansion jig 10, expansion operation of the inner pipe 2 is performed smoothly.

The tube tube expansion device for a heat exchanger of the present invention can be operated by connecting an extrusion hydraulic cylinder to the expansion pipe 12, and may be used by mounting the expansion jig 10 to the hydraulic cylinder provided with the expansion pipe 12. have.

Since the present invention has a structure in which the inner tube 2 is expanded when extruded, a tapered surface 11 is formed at a right edge portion of the expansion jig 10, and the tapered surface is formed on both the left and right sides of the expansion jig 10. 11) may be formed. Therefore, in the present invention, when the expansion tube 12 is extruded, the expansion tube jig 10 enters the inner tube 2 and the inner tube 2 is expanded so that the inner tube 2 is the inner circumferential surface of the fin tube 1. Close to

Accordingly, the fin tube 1 and the inner tube 2 are combined without additional welding, and the fin tube 1 and the inner tube 2 are tightly fixed without any gap, thereby making efficient heat exchange.

Figure 3 is a schematic partial cross-sectional view, side view and excerpt front view showing a third embodiment of the tube tube expansion apparatus for heat exchangers of the present invention.

Tube tube expansion device for a heat exchanger of the present invention is provided with a drawing jig consisting of expansion tube jig 10, expansion tube 12. The expansion tube jig 10 expands the inner tube 2 while moving the inner tube 2 inserted into the fin tube 1 so that the inner tube is in close contact with the inner circumferential surface of the fin tube 1. The expansion pipe 12 is connected to the expansion jig 10 so that the expansion jig 10 moves along the passage of the inner pipe 2 to expand the inner pipe 2.

The expansion jig 10 may be composed of a plurality of stages, and comprises a first expansion jig 10a and a second expansion jig 10b. The diameter of the second expansion jig 10b provided at the left end is larger than the diameter of the first expansion jig 10a. A tapered surface 11 is formed at the right edges of the first expansion jig 10a and the second expansion jig 10b to push the inner circumferential surface of the inner tube 2 outward when the expansion jig 10 moves.

The tapered surface 11 of the expansion jig 10 of the present invention has an inclination of 15 ° to 35 ° with respect to the outer circumferential surface of the expansion jig 10. If the tapered surface 11 of the expansion jig 10 has an inclination of less than 15 ° with respect to the outer circumferential surface of the expansion jig 10, the inclined surface angle of the tapered surface 11 is so small that the inner peripheral surface of the inner tube 2 is pushed properly. As a result, the work efficiency is reduced, such as delayed expansion work.

If the tapered surface 11 of the expansion jig 10 has an inclination exceeding 35 ° with respect to the outer peripheral surface of the expansion jig 10, the inner circumferential surface of the inner tube 2 is not smoothly pushed to the outer peripheral surface of the expansion jig 10. , Some of the inner surface of the inner tube (2) is damaged or torn off problems have occurred. Therefore, since the tapered surface 11 of the expansion jig 10 has the inclination of 15 degrees-35 degrees with respect to the outer peripheral surface of the expansion jig 10, expansion operation of the inner pipe 2 is performed smoothly.

This tube tube expansion device for heat exchanger of the present invention can be operated by connecting the drawing hydraulic cylinder to the expansion rod 12, it may be used by mounting the expansion jig 10 to the hydraulic cylinder provided with the expansion rod (12). have.

Since the present invention has a structure in which the inner tube 2 is expanded when drawn, the tapered surface 11 is formed at the right edge of the expansion jig 10. Therefore, in the present invention, when the expansion pipe 12 is drawn out, the expansion pipe jig 10 enters the inner pipe 2 so that the inner pipe 2 is expanded so that the inner pipe 2 is the inner circumferential surface of the fin tube 1. Close to

This invention is characterized in that the expansion jig 10 is composed of a plurality of stages. That is, the diameter of the second expansion jig 10b is larger than the diameter of the first expansion jig 10a. Therefore, the expansion jig 10 including the first expansion jig 10a and the second expansion jig 10b has an inner tube. When drawn along (2), the inner tube 2 is first expanded by the first expansion jig 10a and then secondly expanded by the second expansion jig 10b.

Therefore, since the inner tube 2 is expanded in order by the expansion range as much as defined by the first expansion jig 10a and the second expansion jig 10b, an excessive load on the inner tube 2 does not temporarily act and is stepwise. Since expansion is made so as not to cause excessive damage to the inner tube (2).

In addition, a stopper 13 may be provided on the right side of the inner tube 2 and the fin tube 1. The stopper 13 is supported by being caught on the step of the first expansion jig 10a when the drawing of the expansion jig 10 is completed, thereby preventing the expansion jig 10 from moving anymore.

Figure 4 is a schematic partial cross-sectional view showing a fourth embodiment of the tube tube expansion device for heat exchangers of the present invention.

In this invention, the expansion jig 10 and the expansion rod 12 are provided. The expansion tube jig 10 expands the inner tube 2 while moving the inner tube 2 inserted into the fin tube 1 so that the inner tube 2 is in close contact with the inner circumferential surface of the fin tube 1. The expansion pipe 12 is connected to the expansion jig 10 so that the expansion jig 10 moves along the passage of the inner pipe 2 to expand the inner pipe 2. A tapered surface 11 is formed at the corner of the expansion jig 10 to push the inner circumferential surface of the inner tube 2 outward when the expansion jig 10 moves.

A scratch groove 1a is formed on the inner circumferential surface of the fin tube 1, and when the inner tube 2 is expanded by the expansion jig 10, the outside of the inner tube 2 is the scratch groove of the fin tube 1. It is provided so that the contact area between the fin tube 1 and the inner tube 2 may increase while being pushed in by (1a).

In the present invention as described above, since the scratch groove 1a is formed on the inner circumferential surface of the fin tube 1, when the inner tube 2 is expanded by the expansion jig 10, the outside of the inner tube 2 is fin tube. The contact area between the fin tube 1 and the inner tube 2 is increased by being pushed into the scratch groove 1a of (1), thereby maximizing the heat transfer efficiency between the inner tube 2 and the fin tube 1. do.

5 is a schematic partial sectional view showing a fifth embodiment of the tube tube expansion apparatus for heat exchange of the present invention.

The present invention is provided with a expansion jig 10, expansion tube 12. The expansion tube jig 10 expands the inner tube 2 while moving the inner tube 2 inserted into the fin tube 1 so that the inner tube is in close contact with the inner circumferential surface of the fin tube 1. The expansion pipe 12 is connected to the expansion jig 10 so that the expansion jig 10 moves along the passage of the inner pipe 2 to expand the inner pipe 2. A tapered surface 11 is formed at the corner of the expansion jig 10 to push the inner circumferential surface of the inner tube 2 outward when the expansion jig 10 moves.

A female screw portion 1b is formed on the inner circumferential surface of the fin tube 1, and a male screw portion 2b is formed on the outer circumferential surface of the inner tube 2, so that the inner tube 2 and the fin tube 1 are primarily When assembling, the male thread part 2b of the inner tube and the female threaded part 1b of the pin tube 1 are assembled by screwing, and when the inner tube 2 is expanded by the expansion jig 10, the pin tube 1 The outside of the inner tube (2) is pushed into the female screw portion (1b) of the fin tube (1) while the outside of the inner tube (2) is filled in the female screw portion (1b) of the fin tube (1) ) Is provided to increase the contact area between.

In the present invention, when the inner tube 2 and the fin tube 1 are temporarily assembled, the male screw portion 2b of the inner tube 2 and the female screw portion 1b of the pin tube 1 are screwed together. Are assembled. Therefore, a separate tool is not required for primary preassembly of the inner tube 2 and the fin tube 1, and can be preassembled with a simple operation of screw assembly.

When the inner tube 2 is expanded by the expansion jig 10, the outer tube including the male thread portion 2b of the inner tube 2 is pushed into the female thread portion 1b of the pin tube 1 so that the fin tube ( The outside of the inner tube 2 is filled in the female screw portion 1b of 1). Therefore, the contact area between the fin tube 1 and the inner tube 2 is increased, thereby maximizing the heat transfer efficiency between the inner tube 2 and the fin tube 1.

On the other hand, in the tube tube expansion device for heat exchanger of the present invention, a heat radiation coating agent consisting of an infrared emitter powder and a binder can be coated around the fin tube (1).

Infrared emitter powders are jade, cerite, cordierite, germanium, iron oxide, mica, manganese dioxide, silicon carbide, pulsar, carbon, copper oxide, cobalt oxide, nickel oxide, antimony pentoxide, tin oxide, chromium oxide, boron nitride, nitride Any one of aluminum and silicon nitride or a mixture of two or more thereof.

The binder is formed of an organic-inorganic hybrid binder. The organic-inorganic hybrid binder is formed by mixing 0.1 to 150 parts by weight of silane or 0.1 to 150 parts by weight of organic resin with respect to 100 parts by weight of colloidal inorganic particles.

Colloidal inorganic particles use any one or a mixture of silica, alumina, magnesium oxide, titania, zirconia, tin oxide, zinc oxide, barium titanate, zirconium titanate and strontium titanate.

Primer treatment is performed between the fin tube and the heat dissipation coating agent. The primer treatment is performed using any one of silane, organic resin, silicone compound, inorganic binder, organic / inorganic hybrid binder, and glass frit.

A protective layer is further formed on the surface of the heat radiation coating agent. This protective layer consists of a material of any one of a silane, an organic resin, a silicon compound, an inorganic binder, an organic / inorganic hybrid binder, and a glass frit.

The present invention is such that heat is well released from the surface of the fin tube 1 by coating a high emissivity heat radiation coating agent having high emissivity on the surface of the fin tube 1.

The heat dissipating coating agent is composed of an infrared emitter powder and a binder and coated on the surface of the fin tube (1). The infrared emitter powder is jade, cercite, cordierite, germanium, iron oxide, mica, manganese dioxide, silicon carbide, macsumite, carbon, One or a mixture of two or more of copper oxide, cobalt oxide, nickel oxide, antimony pentoxide, tin oxide, chromium oxide, boron nitride, aluminum nitride, and silicon nitride is used.

As the binder, any one of a silane binder, an organic binder, a silicone compound binder, an inorganic binder, an organic / inorganic hybrid binder, and glass frit is used.

In addition, the primer treatment is performed between the surface of the fin tube and the heat dissipating coating agent to improve the adhesion of the heat dissipating coating agent. As the primer, a silane, an organic resin, a silicone compound, an inorganic binder, an organic / inorganic hybrid binder, or a glass frit is used.

In addition, a protective layer is further formed on the surface of the heat dissipating agent to protect the heat dissipating agent and to smooth the surface. The protective layer is made of any one of a silane, an organic resin, a silicon compound, an inorganic binder, an organic / inorganic hybrid binder, and a glass frit.

In addition, the silane binder includes a silane having four alkoxy groups, wherein the silane having four alkoxy groups includes tetramethoxysilane, tetraethoxysilane, tetra-n-propoxysilane, tetra-i-propoxysilane, One or more of the group consisting of tetra-n-butoxysilane.

The silane binder also includes a silane having at least one of an acryl group, a methacryl group, an allyl group, an alkyl group, a vinyl group, an amine group and an epoxy functional group as the functional organic alkoxy silane, wherein the functional alkoxy silane is methyltrimethoxysilane. , Methyltriethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, n-propyltrimethoxysilane, n-propyltriethoxysilane, i-propyltrimethoxysilane, i-propyltriethoxysilane , n-butyltrimethoxysilane, n-butyltriethoxysilane, n-pentyltrimethoxysilane, n-hexyltrimethoxysilane, n-heptyltrimethoxysilane, n-octyltrimethoxysilane, vinyl Trimethoxysilane, vinyltriethoxysilane, cyclohexyltrimethoxysilane, cyclohexyltriethoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane, 3-chloropropyltrimethoxysilane, 3-chloropropyl Triethoxysilane, 3,3,3-trifluoro Philtrimethoxysilane, 3,3,3-trifluoropropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 2-hydroxyethyltrimethoxysilane, 2 -Hydroxyethyltriethoxysilane, 2-hydroxypropyltrimethoxysilane, 2-hydroxypropyltriethoxysilane, 3-hydroxypropyltrimethoxysilane, 3-hydroxypropyltriethoxysilane, 3 -Mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 3-isocyanatepropyltrimethoxysilane, 3-isocyanatepropyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3- Glycidoxypropyltriethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltriethoxysilane, 3- (meth) acryloxy Propyltrimethoxysilane, 3- (meth) acryloxypropyltriethoxysilane, 3-ureidopropyl Trialkoxysilanes consisting of limethoxysilane, 3-ureidopropyltriethoxysilane and mixtures thereof, dimethyldimethoxysilane, dimethyldiethoxysilane, diethyldimethoxysilane, diethyldiethoxysilane, di-n- Propyldimethoxysilane, di-n-propyldiethoxysilane, di-i-propyldimethoxysilane, di-i-propyldiethoxysilane, di-n-butyldimethoxysilane, di-n-butyldiethoxysilane, Di-n-pentyldimethoxysilane, di-n-pentyldiethoxysilane, di-n-hexyldimethoxysilane, di-n-heptyldimethoxysilane, di-n-heptyldiethoxysilane, di-n-octyl Consisting of dimethoxysilane, di-n-octyldiethoxysilane, di-n-cyclohexyldimethoxysilane, di-n-cyclohexyldiethoxysilane, diphenyldimethoxysilane, diphenyldiethoxysilane and mixtures thereof One kind selected from the group consisting of dialkoxysilanes and mixtures thereof is used.

In addition, the organic binder has at least one or more functional groups such as vinyl groups, acrylic groups, ester groups, urethane groups, epoxy groups, amino groups, imide groups, and thermosetting organic functional groups that can be thermally polymerized at both ends of the carbon chain or the side chains of the chain. It is one type selected from the group consisting of an organic polymer containing an organic polymer containing at least one functional group and an organic polymer containing a vinyl group, an allyl group, an acryl group, a methacrylate group and a photocurable organic photopolymerizable, The organic polymer is one containing one in which some hydrogen of the hydrocarbon group is substituted with fluorine.

In addition, the silicone compound binder is a substance having a linear, branched or cyclic hydrocarbon group at any one of the four bonding sites of silicon atoms, based on siloxane (-Si-O-), wherein the hydrocarbon group is an alkyl group, Ketone group, acrylic group, methacryl group, allyl group, alkoxy group, aromatic group, amino group, ether group, ester group, nitro group, hydroxy group, cyclobutene group, carboxyl group, alkyd group, urethane group, vinyl group, nitrile Groups having hydrogen or epoxy functional groups alone or in combination of two or more, or those in which some hydrogens of the hydrocarbon groups are substituted with fluorine are used.

In addition, the inorganic binder is formed by adding a material containing at least one ion of Li ⁺ , Na ⁺ , K ⁺ , Mg ²⁺ , Pb ²⁺ , Ca ²⁺ to the water dispersed colloidal silica, which LiOH, NaOH, KOH, Mg (OH) ₂ , Pb (OH) ₂ and Ca (OH) _{2 which} are hydroxides are used.

In addition, the organic-inorganic hybrid binder is used by mixing 0.1 to 150 parts by weight of silane or 0.1 to 150 parts by weight of organic resin with respect to 100 parts by weight of colloidal inorganic particles, the colloidal inorganic particles, silica, alumina, magnesium oxide , Titania, zirconia, tin oxide, zinc oxide, barium titanate, zirconium titanate and strontium titanate or mixtures thereof are used.

In addition, the glass frit binder (glass frit) is made of a powder or flakes by melting and cooling the glass composition at a high temperature, it is widely used for the protective coating or sealing, etc., the melting temperature also varies depending on the composition. The glass frit is present in the form of a solid at room temperature, but when the temperature is increased, the glass becomes a liquid, and thus the glass frit may be used as a binder.

The present invention, while using the existing fin tube 1 as it is, by coating a high radiation rate heat-dissipating coating on the surface of the fin tube (1) to increase the emissivity of the surface of the fin tube (1) conventional fin tube (1) As heat is released well by radiation along with convection on the surface, the heat dissipation efficiency is improved, and it can be applied to all fin tubes 1 of various forms, and its utilization and economic effects are excellent.

Meanwhile, the anti-corrosion coating layer may be applied around the expansion jig 10 and the tapered surface 11 to improve corrosion resistance and wear resistance of the metal surface. The coating material of this anti-corrosion coating layer is 20% by weight benzimidazole, 30% by weight propylene glycol methyl ether, 15% by weight hafnium, 10% by weight molybdenum (MoS2), 15% by weight aluminum oxide, bisphenol F diglyci Consists of 10% by weight of diether ether, the coating thickness may be formed to 8㎛.

Benzimidazole, propylene glycol methyl ether and bisphenol F diglycidyl ether serve to prevent corrosion and discoloration.

Hafnium is a corrosion-resistant transition metal element that serves to have excellent waterproofness and corrosion resistance.

Molybdenum emulsion plays a role of imparting slidability and lubricity to the surface of the coating film.

Aluminum oxide is added for the purpose of fire resistance, chemical stability, and the like.

The reason for numerically limiting the ratio and the coating thickness of the constituents as described above was analyzed by the present inventors through several failures, and the present inventors showed the optimum anti-corrosion effect at the ratio.

In addition, the anti-fouling coating layer made of the anti-fouling coating composition may be applied to the circumference of the expansion rod 12 so as to effectively prevent the adhesion and removal of the contaminants.

The anti-fouling coating composition contains cocamidopropyl betaine and ampho glycinate in a 1: 0.01 to 1: 2 molar ratio, and the total content of cocamidopropyl betaine and ampho glycinate is 1 to 1 with respect to the total aqueous solution. 10% by weight.

The cocamidopropyl betaine and ampho glycinate is preferably 1: 0.01 to 1: 2 as the molar ratio. When the molar ratio is out of the above range, the applicability of the expansion rod 12 is reduced or after the application of moisture absorption on the surface. There is a problem that the coating film is removed to increase.

The cocamidopropyl betaine and ampo glycinate is preferably 1 to 10% by weight of the total composition aqueous solution, if less than 1% by weight has a problem that the applicability of the expansion rod 12 is lowered, more than 10% by weight If it is, crystal precipitation is likely to occur due to an increase in the coating film thickness.

On the other hand, it is preferable to apply | coat by the spray method as a method of apply | coating this antifouling coating composition to the expansion pipe 12. In addition, the final coating film thickness of the expansion pipe 12 is preferably 550 to 2000 kPa, more preferably 1100 to 1900 kPa. If the thickness of the coating film is less than 550 mmW, there is a problem of deterioration in the case of high temperature heat treatment, and if the thickness of the coating film is more than 2000 mm, crystal precipitation of the coated surface is liable to occur.

In addition, the present antifouling coating composition may be prepared by adding 0.1 mol of cocamidopropyl betaine and 0.05 mol of ampo glycinate to 1000 ml of distilled water, followed by stirring.

In addition, a perfume material mixed with a functional oil may be coated around the fin tube 1, thereby sterilizing the fin tube 1 and relieving stress or fatigue of the worker.

The mixing ratio of the fragrance substance and the functional oil is 95 to 97 wt% of the fragrance substance and 3 to 5 wt% of the functional oil, and the functional oil is 50 wt% of Hypericum oil and Angelica oil. ) 50% by weight.

The functional oil is preferably 3 to 5% by weight relative to the perfume. When the mixing ratio of the functional oil is less than 3% by weight, the effect is insignificant, and when the mixing ratio of the functional oil exceeds 3 to 5% by weight, the function thereof is not greatly improved while the manufacturing cost is greatly increased.

Hypericum oil has a good effect on neuralgia, myalgia, antidepression and stress relief.

Angelica oil has excellent effects on detoxification, skin disease treatment, sterilization, itching, clearing hair, and relaxation.

Since the fragrance material mixed with these functional oils is coated on the fin tube 1, the fin tube 1 can be sterilized and the worker's fatigue can be reduced. The reason for numerically limiting the components and proportions of the functional oil and the fragrance substance is that the inventors have shown the optimum effect in the components and ratios as a result of analyzing the results through the test results several times.

1: Fin Tube 1a: Scratch Groove
1b: female thread part 2: inner tube
2b: Male thread portion 10: Expansion jig
10a: 1st expansion jig 10b: 2nd expansion jig
11: tapered surface 12: expansion rod
13: stopper

Claims (5)

delete delete delete Expanding jig 10 to expand the inner tube (2) while moving the inner tube (2) inserted into the fin tube (1) so that the inner tube (2) is in close contact with the inner circumferential surface of the fin tube (1);
Connected to the expansion pipe jig 10 so that the expansion pipe jig 10 moves along the passage of the inner pipe 2, and is made of a expansion pipe 12 for expanding the inner pipe 2;
The tapered surface 11 is formed in the corner part of the expansion jig 10 to push the inner peripheral surface of the inner tube 2 outward when the expansion jig 10 moves;
Around the fin tube (1) is coated with a heat-dissipating coating consisting of an infrared emitter powder and a binder, the infrared emitter powder is jade, cerite, cordierite, germanium, iron oxide, mica, manganese dioxide, silicon carbide, macsumite, carbon, Copper oxide, cobalt oxide, nickel oxide, antimony pentoxide, tin oxide, chromium oxide, boron nitride, aluminum nitride and silicon nitride, or any mixture of two or more thereof, and the binder is formed of an organic-inorganic hybrid binder, The geometric hybrid binder is formed by mixing 0.1 to 150 parts by weight of silane or 0.1 to 150 parts by weight of organic resin with respect to 100 parts by weight of colloidal inorganic particles;
The colloidal inorganic particles may be any one or a mixture of silica, alumina, magnesium oxide, titania, zirconia, tin oxide, zinc oxide, barium titanate, zirconium titanate and strontium titanate;
A primer treatment is performed between the fin tube 1 and the heat dissipation coating agent, and the primer treatment is performed using any one of a silane, an organic resin, a silicone compound, an inorganic binder, an organic / inorganic hybrid binder, and glass frit. under;
A protective layer is further formed on the surface of the heat dissipating coating agent, wherein the protective layer is made of any one material of silane, organic resin, silicon compound, inorganic binder, organic / inorganic hybrid binder, and glass frit. Inner tube expansion device for heat exchanger.
The tapered surface 11 of claim 4,
An inner tube expansion apparatus for a heat exchanger, characterized in that it has a slope of 15 ° to 35 ° with respect to the outer peripheral surface of the expansion jig (10).

Images