JPH0579261U - Heat pipe with double tube header - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the workability of manufacturing heat pipes with double headers. [Structure] Inner tube 22 and its inner tube 2 in which a heating section flows as a heat source
A double-tube header which is composed of a double tube with an outer tube 21 in a sealed state covering 2 and has one end of a plurality of heat-radiating tubes 10 as a heat pipe structure connected to the outer tube 21. In the heat pipe equipped with, a thin tube 40 for deaeration and liquid injection was attached to the outer tube 21.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a heat pipe having a structure in which a plurality of heat-radiating pipes are connected to a header.

[0002]

[Prior Art]

 It is well known that heat pipes are widely used in various heat-related devices such as heat exchangers and heating devices, because they have excellent heat conductivity and temperature uniformity. The example shown in FIG. 5 is an example used as a snow melting device, and this heat pipe 100 connects a plurality of heat radiating pipes 10 and a header outer pipe 21 to make them a heat pipe structure and The header inner pipe 22 is penetrated in an airtight state along the central axis of the pipe 21, and hot water as a heat source is caused to flow through the header inner pipe 22. In other words, when the heat transfer pipe 10 is attached to the roof of a road or a building and a heat medium is flown through the header inner pipe 22, the working fluid enclosed in the header outer pipe 21 evaporates and moves to the heat radiation pipe 10 side. By radiating heat in the heat radiating pipe 10, snow accumulated on the road or roof can be melted, and the working fluid condensed in the radiating pipe 10 is returned to the header outer pipe 21 side.

[0003]

[Problems to be solved by the device]

 However, in the above conventional heat pipe 100, the nozzle 40 for degassing and injecting the working fluid used at the time of manufacture is attached to one end of each radiating pipe 10. This is because this heat pipe 100 is manufactured by using the existing radiating pipe with a nozzle that has been in a semi-finished product state. For this reason, a plurality of sealing operations for the nozzle 40 after the deaeration process have been completed. However, there is a problem in that the number of manufacturing steps is increased.

In order to solve the above problems, the present invention provides a heat pipe having a double pipe type header capable of reducing the number of thin pipes required for degassing and liquid injection as much as possible. The purpose is.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention has a heating section which is composed of a double tube including an inner tube through which a heat source flows and an outer tube in a sealed state covering the inner tube, and the outer tube has a heat pipe structure. A heat pipe having a double pipe header in which one ends of a plurality of heat radiating pipes are connected in communication with each other, characterized in that a thin pipe for deaeration and injection is attached to the outer pipe. Is.

[0006]

[Action]

 In this invention, when degassing from the heat radiating pipe or the outer pipe that communicates with it and injecting the working fluid, the work is performed through the thin pipe attached to the outer pipe that serves as the header, but after that When the condensable gas is exhausted by the heating-discharging method, the outer tube to be a header tube and the thin tube attached to it should be facing upward. This is to eliminate the generation of non-condensable gas pools (pockets), after which the thin tubes are sealed to form a heat pipe structure. Therefore, work such as deaeration, liquid injection, and sealing is performed with a small number of thin tubes, which improves workability.

[0007]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a heat pipe according to an embodiment of the present invention. In FIG. 1, reference numeral 10 is a heat radiating pipe, and reference numeral 20 is a header serving as a heating portion. The header 20 includes an outer pipe 21 in which a plurality of heat radiating pipes 10 are attached at a predetermined pitch along the axial direction, and a heat medium (for example, hot water) that penetrates the outer pipe 21 and serves as a heat source inside. It has a double pipe structure consisting of an inner pipe 22 through which the water flows. It should be noted that flanges 22a are attached to both ends of the outer tube 21.

The heat radiating pipe 10 communicates with the outer pipe 21 of the header 20 and has a sealed end portion. A wick for returning the working fluid by capillary pressure is provided in the heat radiating pipe 10 as needed. Good. When the heating part (header 20) and the heat radiating part (heat radiating pipe 10) are in a horizontal state or when the header 20 is used in an inclined state in which the heat radiating pipe 10 faces downward, the working fluid in the liquid phase is It can be returned by gravity, so no wick is needed.

The heat pipe 1 described above has a portion of the header 20 surrounded by the heat radiating pipe 10 and the outer pipe 21 and the inner pipe 22 (hereinafter referred to as a heat pipe container 30) in a deaerated state such as chlorofluorocarbon. By enclosing the working fluid, it is used as a heat exchanger for snow melting, for example. For example, a radiator pipe 10 is installed on a road in an area with a large amount of snowfall, a header 20 is installed on one side of the road, and hot water is supplied to an inner pipe 22 of this header 20 so that The hydraulic fluid between the pipe 22 and the outer pipe 21 is heated by heat input from the inner pipe 22, and the vapor thereof flows to the radiating pipe 10 side. On the other hand, in the heat radiating pipe 10, the working fluid vapor gives heat to the outside snow to be condensed, and the snow is melted. The condensed working fluid is returned to the outer tube 21 side of the header 20 by the action of wick or gravity.

In manufacturing the heat pipe 1, the heat pipe container 30 is deaerated, the working fluid is enclosed in the heat pipe container 30, and then a habituation operation (seasoning) is performed. There are various methods for degassing and liquid injection, such as vacuum degassing and liquid injection, and a heat-discharging method in which excess liquid is injected and evaporated to discharge the non-condensable gas together with liquid injection. There is. In the seasoning, the heat pipe container 30 is kept slightly hotter than the normal operating temperature while only the working fluid is sealed in the heat pipe container 30 to improve / promote the wettability inside the heat pipe container 30. The immobilization film is generated, non-condensable gas is promoted to be generated from the heat pipe container 30 itself, and gas leakage is detected. After the seasoning is completed, deaeration work is performed to release the non-condensable gas generated inside to the outside.

In manufacturing the heat pipe, the working fluid is injected into the heat pipe container 30 and the non-condensable gas is released (deaerated) from the heat pipe container 30. A small-diameter nozzle (narrow tube) 40 is attached to this, and finally this nozzle 40 is sealed by crimping or welding. In the above heat pipe 1 according to the present invention, as shown in FIG. 1, the nozzle 40 is attached to an intermediate position of the outer tube 21 of the header 20, and degassing and liquid injection are performed via this nozzle 40. Here, as shown in FIG. 2, in order to enhance the effect of degassing work, this heat pipe container 30 has a lower portion of the heat radiating pipe 10 with the header 20 facing upward and slightly inclined. In the case of No. 2, it is inserted into hot water that is stretched in the container 2.

In order to eliminate the non-condensable gas pocket, the nozzle 40 is attached to the uppermost portion of the heat pipe container 30 during degassing. Therefore, when the acute-angled inclination angle between the axis M of the radiating tube 10 and the surface of the heating source 3 is θ, the nozzle 40 is aligned with the axis M of the radiating tube 10 in the circumferential direction of the outer tube 21 of the header 20. On the other hand, it is set at a position of (90-θ) degrees. In particular, when the heat pipe container 30 is degassed after seasoning, if the heat pipe container 30 is kept in the above state even during the seasoning, the subsequent degassing work becomes easy.

Therefore, since the nozzle 40 for injecting and degassing is attached on the header 20 side and at the predetermined position of the outer tube 20 which is the highest position at the time of degassing, the nozzle 40 for injecting and degassing can be injected and degassed by this one nozzle 40. Can be performed sufficiently. That is, since only one nozzle 40 is required, it suffices to mount or seal the nozzle 40 on one nozzle 40, and not only the mounting but also all the operations such as sealing are simplified. In other words, by mounting the nozzle 40 at a predetermined position on the header 20, the number of manufacturing steps of the heat pipe 1 can be reduced. The number of nozzles 40 is not limited to one, and may be increased based on the length of the outer tube 21 and the like, if necessary.

As shown in FIG. 3, the nozzle 40 may be attached to the outer tube 21 of the header 20 so as to project therefrom, or the outer tube 21 of the header 20 may be provided with a recess 21 a as shown in FIG. It may be provided and attached to the outer tube 21 of the header 20 in a state of being embedded in the recess 21a. In the latter case, since the nozzle 40 does not project to the outside, the heat pipe container 30 can be easily handled, and the heat retaining work for the outer pipe 21 of the header 20 can be facilitated.

[0015]

[Effect of the device]

 As is clear from the above description, according to the present invention, the heat radiating pipe assembly is used for degassing and injecting the working fluid in the heat pipe structure portion including the plurality of heat radiating pipes and the header communicating with the heat radiating pipes. Since the configuration is performed via a thin tube attached to a certain header, not only the installation of the thin tube, but also all the work such as deaeration, injection, and sealing may be performed through a small number of thin tubes. It is possible to simplify the manufacturing work of the heat pipe having the heavy pipe type header.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a side view showing the seasoning state.

FIG. 3 is a sectional view of an embodiment of the present invention.

FIG. 4 is a partial cross-sectional view showing an example of a nozzle mounting structure.

FIG. 5 is a perspective view showing an example of a heat pipe provided with a conventional double pipe header.

[Explanation of symbols]

 10 Radiant pipe 21 Outer pipe 22 Inner pipe 40 Nozzle

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shinichi Sugihara 1-5-1 Kiba, Koto-ku, Tokyo Fujikura Electric Wire Co., Ltd. (72) Koichi Masuko 1-5-1 Kiba, Koto-ku, Tokyo Fujikura Electric Wire Co., Ltd. (72) Inventor Yuuji Saito 1-5-1, Kiba, Koto-ku, Tokyo Fujikura Electric Line Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A heating section comprises a double tube including an inner tube through which a heat source flows and an outer tube in a sealed state covering the inner tube, and the outer tube has one end of a plurality of heat radiating tubes as a heat pipe structure. A heat pipe provided with a double-tube header in which parts are connected to each other, wherein a heat exchanger having a double-tube header characterized in that a thin tube for deaeration and injection is attached to the outer tube. pipe.