JP2002350082A - Heating tube for condensation in tube and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating tube for condensation in a tube and its manufacturing method, which has an excellent condensation heat-transfer performance, enhances performance of a heat exchanger, and contributes to energy conservation. SOLUTION: In this heating tube 10, a plurality of wicks 2 are welded on a copper plate, which is formed into a tube body 1, a great number of continuous fins 1a are formed through a finning-work to respective parts between the wicks 2 on the copper plate. The copper plate, on which wicks 2 and a great number of fins 1a are formed, is rounded into a tube with the wicks 2 and the fins 1a placed inside, and the tube is welded at the joint part 3. The fins 1a facilitate the refrigerant flow, and refrigerant condensation proceeds. Heat-transfer area is greatly enlarged by the wicks 2, and the condensation proceeds pronouncedly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-pipe condensing heat transfer tube for exchanging heat by condensing a refrigerant in a pipe and a method for producing the same, and more particularly, to a heat exchanger having excellent condensation heat transfer performance. The present invention relates to an in-pipe condensation heat transfer tube that can contribute to high performance and energy saving, and a method for manufacturing the same.

[0002]

2. Description of the Related Art In a heat exchanger of a refrigerator, an air conditioner, a heat pump, or the like, a refrigerant is passed through a heat transfer tube, and the refrigerant is condensed in the heat transfer tube to perform a necessary heat exchange to perform a necessary heat exchange. Heat tubes are used.

[0003] In recent years, in order to protect the ozone layer and prevent global warming, Freon HCFC22, which has been used for room air conditioners and package air conditioners, has been decided to be totally abolished in principle in 2020. Is being promoted. For this reason, conventionally, a heat exchanger with an inner groove having a high heat transfer coefficient has been used for a heat exchanger of a room air conditioner or a package air conditioner.

[0004] As such a conventional heat transfer tube having an inner surface groove, there is one disclosed in, for example, JP-A-1-131895 and JP-A-52-38663.

The heat transfer tube with an inner groove shown in Japanese Patent Application Laid-Open No. 1-131895 has a trapezoidal groove in cross section, and the heat transfer tube with an internal groove shown in Japanese Patent Application Laid-Open No. 52-38663. Has triangular grooves as a cross-sectional shape, and these grooves are formed at a predetermined angle with respect to the pipe axis direction. As a result, the heat transfer area in the tube increases, so that a heat transfer tube having a high heat transfer coefficient and a small pressure loss can be provided for heat transfer involving condensation in the heat transfer tube. It can contribute to miniaturization and miniaturization.

[0006]

However, according to the conventional heat transfer tube, when the refrigerant condenses in the tube, it is more effective to increase the heat transfer area in the tube, but there is a limitation in processing. Therefore, it is not easy to increase the heat transfer area.

[0007] In order to further save energy in the heat exchangers of room air conditioners and packaged air conditioners, there is a strong demand for higher performance of inner grooved tubes. However, the high performance of the heat exchanger cannot be sufficiently achieved, and it cannot contribute to further energy saving.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a heat transfer tube for condensing in a pipe, which has excellent heat transfer performance for condensation and can contribute to high performance and energy saving of a heat exchanger, and a method of manufacturing the same. is there.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a heat transfer tube for condensing a refrigerant in a tube main body for heat exchange, wherein a wick provided on an inner surface of the tube main body. And a continuous groove or projection formed on the inner surface of the tube main body. According to this configuration, the refrigerant easily flows by the continuous grooves or protrusions, and the condensation of the refrigerant proceeds, and the heat transfer area is greatly increased by the wick, so that the condensation proceeds remarkably.

[0010] In order to achieve the above object, the present invention provides a method of manufacturing a heat transfer tube for condensing heat in a pipe, in which a refrigerant is condensed in a pipe main body to exchange heat, wherein a wick is welded on a copper plate serving as the pipe main body. A continuous groove or projection is formed on a portion other than the portion where the wick is welded on the copper plate, and the copper plate on which the wick and the groove or projection are formed is oriented such that the wick and the groove or projection face inward. The present invention provides a method for producing a heat transfer tube for condensing inside a tube, characterized in that the tube is formed into a tube. According to this configuration, it is possible to easily increase the surface area in the tube main body by welding a wick in addition to the continuous grooves or protrusions on the copper plate serving as the tube main body, thereby improving the heat transfer coefficient. .

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1A is a development view of an in-pipe condensing heat transfer tube according to an embodiment of the present invention, and FIG.
(A) is a cross-sectional view taken along the line AA, and (c) is a cross-sectional view. This tube heat transfer tube 10 for condensation is shown in FIGS.
As shown in FIG. 1, a plurality of wicks (formed by knitting ultra-fine copper wires) 2 are welded on a copper plate serving as a tube main body 1, and fins are formed between the wicks 2 on the copper plate to form a large number of fins. A continuous fin 1a is formed, and as shown in FIG. 3 (c), a copper plate on which a plurality of wicks 2 and a large number of continuous fins 1a are formed is rounded so that the wicks 2 and the fins 1a face inward, and a joining portion is formed. It was made by welding in Step 3. The portions where the plurality of wicks 2 are formed and the portions where the plurality of fins 1 a are formed are alternately formed on the inner surface of the tube main body 1 in the circumferential direction.

FIG. 2 shows a heat transfer tube 10 for condensation in a tube shown in FIG.
Is shown. This manufacturing apparatus is configured so that the wick 2 can be welded to a copper plate, fin processing to the copper plate, and tube forming can be performed by one line. When a copper plate serving as the tube body 1 is supplied from the decoiler 11 of the manufacturing apparatus shown in FIG. 1 and a wick 2 is supplied from the decoiler 12, the wick 2 is welded to the copper plate by the electrode rolls 13, 13 and the upset rolls 14, 14. Joined. The copper plate to which the wick 2 is joined is subjected to fin processing by the embossing rolls 15 and 15 to form a large number of fins 1a.
The pipe is rounded by 17 and welded by a welding machine 18 to form a pipe. In this way, a heat transfer tube 10 for condensing the tube, in which a number of fins 1a are formed in a spiral shape between the plurality of wicks 2 on the inner surface of the tube main body 1, is manufactured.

The refrigerant flowing inside the heat transfer tube 10 manufactured in this way is the fins 1 arranged in a spiral shape.
Since the refrigerant flows while swirling by a, the refrigerant is hardly affected by the gravitational field. Therefore, the refrigerant condenses at the fin 1a, but the wick 2 formed between the fins 1a has a large heat transfer area. The condensation here is fin 1a
This occurs remarkably in comparison with the portion, and as a result, heat transfer is improved. The refrigerant flowing through the fins 1a is
The heat transfer efficiency is further improved by the synergistic effect of the fin 1a and the wick 2.

[0014]

As described above, according to the in-pipe condensing heat transfer tube of the present invention, a continuous groove or projection formed on the inner surface of the pipe body facilitates the flow of the refrigerant, and the wick greatly increases the heat transfer area. Since it is increased, it has excellent condensation heat transfer performance, and can contribute to higher performance and energy saving of the heat exchanger.

[Brief description of the drawings]

FIG. 1A is a development view of an in-tube condensation heat transfer tube according to an embodiment of the present invention, FIG. 1B is a cross-sectional view taken along line AA of FIG.
(C) is a cross-sectional view.

FIG. 2 is a view showing an apparatus for manufacturing the in-pipe condensation heat transfer tube 10 shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tube main body 1a Fin 2 Wick 3 Joining part 10 Heat transfer tube for condensation inside pipe 11, 12 Uncoiler 13 Electrode roll 14 Upset roll 15 Emboss roll 16, 17 Roll forming machine 18 Welding machine

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B21D 5/12 B21D 5/12 J 13/04 13/04 Z 53/04 53/04 Z F25B 39/04 F25B 39/04 U

Claims (5)

[Claims] 1. An in-pipe condensing heat transfer tube for exchanging heat by condensing a refrigerant in a tube body, wherein a wick provided on an inner surface of the tube body and a continuous groove formed on an inner surface of the tube body. A heat transfer tube for condensation in a tube, comprising: a projection. 2. The wick is a plurality of wicks provided on the inner surface of the tube main body, and the continuous grooves or projections are a plurality of continuous grooves or projections formed between the plurality of wicks. The heat transfer tube for condensation in a tube according to claim 1, wherein: 3. The condensing pipe according to claim 1, wherein the plurality of wicks and the plurality of continuous grooves or projections are formed alternately in the circumferential direction on the inner surface of the pipe body. Heat tube. 4. The heat transfer tube for condensation in a pipe according to claim 1, wherein said plurality of continuous grooves or projections are a plurality of fins formed in a spiral shape. 5. A method for manufacturing a tube-condensing heat transfer tube for exchanging heat by condensing a refrigerant in a tube main body, wherein a wick is welded on a copper plate serving as the tube main body, and the wick on the copper plate is welded. Forming a continuous groove or projection on a portion other than the portion where the wick and the copper plate on which the groove or projection is formed are formed such that the wick and the groove or projection face inward. A method for manufacturing a heat transfer tube for condensation in a tube.