JPS5888594A - Method of filling heat pipe with operating fluid and sealing opening hole thereof - Google Patents

Abstract

PURPOSE:To permit to fill with a good operability by a method wherein the heat pipe is evacuated by the operation of a vacuum circuit and is filled with the operating fluid from an operating fluid filling device, thereafter, the opening thereof is sealed temporarily by forcing an elastic plug thereinto and is sealed perfectly by screwing the elastic plug. CONSTITUTION:The operating fluid filling device 4 is closely attached to the opening 2 of the heat pipe 1, the vacuum pump 12 is driven and a valve 11 is opened to evacuate it, then, the valve 11 is closed when the heat pipe 1 and a cylinder 7 are evacuated, and, subsequently, the valve 14 is opened to fill the heat pipe with a specified volume of the operating fluid 19. Thereafter, the valve 14 is closed and a switching valve 16 is switched to force the U-cup-shaped soft polyethylene 9 into the opening 2 by the operation of a piston 8, thereby sealing it temporarily. Under this consition, the operating fluid filling device 4 is removed, an anaerobic sealing material is coated on the outer diametral male screw thread 3 of the opening 2 and a carbon steel box nut is screwed to seal it perfectly. Thus, the filling and the sealing of the heat pipe are effected with a good operability.

Description

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, a heat pipe is filled with a working fluid at room temperature to obtain a completely sealed state at low cost. The present invention relates to a method of filling a heat pipe with a working fluid and sealing an opening.

As is well known, a heat pipe is a metal pipe whose one end is closed and a working fluid such as water, acetone, ammonia, methanol, chlorofluorocarbons, heat transfer oil, etc. is pumped into the pipe under low pressure through an open hole at the other end. It is manufactured by filling the pipe for 10 to 60 minutes and sealing the opening, and it is designed to transfer heat by forming a continuous evaporation and condensation cycle of the working fluid inside the pipe. Therefore, heat pipes require a means to continuously circulate the above-mentioned working fluid, but in the past, heat pipes had a wick made of wire mesh, felt, fiber, etc. arranged inside the pipe, or grooves were provided on the inner wall of the pipe. There are known devices in which the working fluid is circulated through the capillary tube K to create a capillary action.

Recently, the use of heat pipes has become widespread.1 For example, in the method of preventing freezing of pedestrian bridges in Japanese Patent Application Publication No. Jd-9390.7, one end of the heat pipe is buried several meters to 20 meters underground, and one end of the heat pipe is buried several meters to 20 meters underground, using underground heat as a heat source. It has been proposed that heat vibrations be used to melt snow near the steps of pedestrian bridges.

The method and method for filling a conventional heat vibrator with hydraulic fluid are as follows:
Either attach a pulp to one end of the heat vibrator and use this pulp to reduce the pressure inside the heat pipe and fill it with working fluid, or alternatively, after the working fluid is flowed into the pipe opening under low pressure (cooled to below the boiling point). The methods used include welding a plug to the opening or screwing a cap nut into the hole.

However, heat vibrators with pulp attached to one end are expensive, and when filled with a working fluid that evaporates easily at room temperature, the working fluid must be cooled below its boiling point. In addition, when filling a pipe with a length of 30 m with hydraulic fluid, there is a drawback that workability is poor, such as having to lift one end of a heavy pipe to fill the pipe.

The present invention has been made in order to improve the above-mentioned drawbacks, and the present invention provides a heat vibrator having a part that temporarily adheres to the outside diameter of the heat pipe opening, a vacuum circuit that can be opened and closed, and a hydraulic fluid filling circuit. A cylinder with approximately the same diameter as the inner diameter; a hydraulic fluid filling device having a piston at one end of the cylinder that moves forward and backward within the cylinder by an appropriate operating mechanism; and an elastic body or elastic material capable of temporarily sealing the inner diameter of the heat vibrator. With the plug tightly attached to the piston, temporarily attach it to the heat pipe opening, activate the vacuum circuit to create a vacuum inside the heat pipe, and then activate the hydraulic fluid filling circuit to heat the hydraulic fluid. Then, by operating the piston, press the elastic body or the plug with the elastic body into the heat vibrator opening and temporarily seal it. 1. After removing the hydraulic fluid filling device, remove the bottomed cylindrical body or the plug. It is characterized in that it is screwed or welded to the heat pipe opening to completely seal the heat pipe opening. This is a method of filling a heat pipe with working fluid and sealing the opening.The purpose of this method is to easily fill the working fluid, which easily evaporates at room temperature, into the heat pipe without cooling it to its boiling point. To provide a method for sealing an opening at low cost and with good workability.

The present invention will be explained in detail below.

In the present invention, first, a metal heat vibrator (
(hereinafter referred to as "pipe") For example, an elastic body or an elastic body capable of temporarily sealing the inner diameter of the above-mentioned hydraulic fluid filling device or vibrator in the opening of a pipe such as S, G, P (carbon steel pipe for piping) or steel pipe. While the plug with the handle is in close contact with the piston, the plug is temporarily brought into close contact with the piston.

When the hydraulic fluid filling device is temporarily brought into close contact with the pipe opening in this way, the inner diameter of the pipe and the diameter of the cylinder are approximately the same diameter, so they communicate closely.

The above-mentioned hydraulic fluid filling device has a hydraulic fluid filling circuit equipped with a pulp that can be opened and closed, and a vacuum circuit that creates a vacuum inside the pipe. It is also possible to have a circuit that fills the

These circuits may be provided independently, but it is also possible to provide two circuits that can be switched to each other by pulp operation in order to improve the vacuum level inside the pipe. It is also possible to use the commonly used method of filling the pipe with a small amount of air or a gas with a high specific gravity, such as fluorocarbon or nitrogen, and then operating a vacuum pump to create a vacuum inside the pipe.

It is possible to connect a vacuum pump to the vacuum circuit and create a vacuum inside the pipe by passing the pulp through. In addition, a filling machine that dispenses a fixed amount of hydraulic fluid can be connected to the hydraulic fluid filling circuit, or a small pressure-resistant container can be filled with a fixed amount of hydraulic fluid in advance, similar to when replacing and replenishing the refrigerant in an automobile cooler. However, it is also possible to connect this small pressure-resistant container to a hydraulic fluid filling circuit and fill the pipe with a certain amount of hydraulic fluid based on the pressure difference between the inside of the pipe and the inside of the small pressure-resistant container.

To temporarily attach the hydraulic fluid filling device to the pipe opening, install a screw on the outside diameter of the pipe and screw the part of the cylinder of the hydraulic fluid filling device that is temporarily attached, or use a rubber O-ring. By fitting the sealing material together, the pipe opening and the part of the pipe joint of the hydraulic fluid filling device that temporarily contacts are brought into temporary contact, etc.

Any method may be used as long as the inside of the pipe and the cylinder are communicated and temporarily attached.

Although any piston can be used as the piston in the cylinder of the hydraulic fluid filling device, for example, a piston connected to an air cylinder and capable of advancing and retracting using the pressure of compressed air is preferably used.

In addition, when the piston is moved in close contact with the piston, an elastic body that can temporarily seal the inner diameter of the pipe may be 1 cylindrical, 1 conical, or U-cup shaped rubber, soft polyethylene, Teflon, etc. to seal the inner diameter of the pipe. As long as it can temporarily seal the
A metal plug having a cylindrical shape, a conical shape, a U-cup shape, or a rivet shape and having an elastic body such as a rubber or resin O-ring-U cup-shaped gasket at the place where it contacts the inner diameter of the pipe is suitable.

As mentioned above, the hydraulic fluid filling device is temporarily attached to the opening of the pipe, the vacuum circuit is activated to evacuate the pipe, and the hydraulic fluid filling circuit is activated to fill the pipe with hydraulic fluid, and then the piston is heated. ' Press the elastic body or the plug having the elastic body into the pipe opening for temporary sealing, and then remove the hydraulic fluid filling device.

After temporarily sealing the pipe in this way, the bottomed cylindrical body used to completely seal the pipe is, for example, a metal meklanut (bag nut). Either screw the nut onto the pipe using a sealing material, etc., or screw the nut onto the pipe without using a sealing material, and then weld a blind nut to the outside diameter of the pipe to completely seal the inside of the pipe. In the case of a plug with an elastic body, it has a shape such as 1 cylindrical shape, 1 conical shape, U cup shape, rivet shape, etc. For example, a rubber O ring, a Teflon ring, or a U cup shape. After press-fitting a plug with an elastic body such as a packing into the inner diameter of the pipe, weld the part that contacts the inner diameter of the pipe or the open end of the pipe. By smelling, the inside of the pipe is completely sealed and heat vibration can be easily obtained. I can do it.

In this way, in the present invention, it is possible to evaporate at room temperature.
For example, it is possible to use acetone, ammonia, chlorofluorocarbons, etc., and there is no need to attach expensive pulp to the heat vibrator. Filled U
The present invention is a very useful invention because it is possible to reduce the pressure inside the heat pipe, fill it with a working fluid, and completely seal it easily, and it is possible to manufacture a heat pipe at low cost and with good workability. be.

The present invention will be described in detail in accordance with the following five aspects.

The drawings are for explaining the present invention in detail, and Figure 1 is a vertical cross-sectional view showing the state in which the hydraulic fluid filling device is temporarily attached to the heat pipe opening, and Figures 1 and 3 are FIG. 2 is a longitudinal cross-sectional view showing a state in which the heat pipe opening is sealed.

Heat vibe 1 with a wick 23 inside with one end closed
In order to temporarily attach the hydraulic fluid filling device 4 to the outer diameter male screw 3 of the opening 2 of the heat vibrator 1, the female screw 5 of the hydraulic fluid filling device 4 is screwed into the outer diameter male screw 3 of the opening 2 of the heat vibrator 1, and the O-ring At 6, the opening 2 of the heat vibrator 1 and one end of the cylinder 7 of the hydraulic fluid filling device 4 are sealed so that they are in close communication with each other. At this time cylinder 7
A U-cup shaped soft polyethylene 9 is brought into close contact with the piston 8 located at the other end. This cylinder 7 has a vacuum circuit 1
0 is connected to an external vacuum pump 12 through a pulp 11, and 1 hydraulic fluid filling circuit 13 is connected to an external hydraulic fluid filling machine 15 through a pulp 14.

The working fluid filling device 4 is temporarily attached to the opening 2 of the heat vibrator 1 in the above state, and the vacuum pump 12 is operated to open the pulp 11 and the inside of the heat pipe 1 and the cylinder 7 are depressurized by the vacuum circuits 1 and 0. Make it. At this time, the pulp 14 is in a closed state. When the pressure inside the heat pipe 1 and the cylinder 7 is reduced, the pulp 11 is closed, the pulp 14 is first opened, and the hydraulic fluid filling machine 15 is operated to supply a certain amount of hydraulic fluid (Freon, for example, dichloride) from the hydraulic fluid filling circuit 13. Tetrafluoroethane] 19 is filled into the heat pipe L. After filling the working fluid 19, the pulp 14 is closed and the switching valve 16 is activated to move the piston 8 with compressed air from the air compressor 17. Polyethylene 9 is press-fitted into the opening 2 of the heat vibe 1, and the working fluid 19 is temporarily sealed inside the heat vibe 1.

U-cup shaped soft! With the polyethylene 9 press-fitted into the opening 2 of the heat pipe 1, the hydraulic fluid filling device 4 is removed from the heat pipe 1, and an anaerobic sealing material [for example ( By applying Nejilock Super JH (manufactured by Three Bond Co., Ltd.) and screwing the carbon steel bag nut 18 onto the male screw 3, the opening 2 is sealed as shown in FIG. Completely seal.

What is shown in FIG. 3 is an example in which a flat rivet-like plug 21 is used to seal the opening 2 of the heat pipe in the above-mentioned U-cup shaped soft polyethylene 90s. in this case,
After moving the piston 8 and press-fitting the flat rivet-like plug 21 with the O-ring 20 made of U-cup-shaped feed polyethylene 90s rubber into the opening 2 of the heat pipe 1, the hydraulic fluid filling device 4 is inserted into the heat pipe l. Then, the heat pipe is removed in the same manner as described above except that the open end 22 of the open hole 2 of the heat pipe 1 and the outer periphery of the flat plate part of the flat rivet plug 21 are explosively welded to form the welded part 24. Opening part 2
to completely seal the inside of the heat vibrator.

[Brief Description of the Drawings] The drawings are for explaining the present invention in detail. Fig. 1 is a longitudinal cross-sectional view showing a state in which the hydraulic fluid filling device is temporarily attached to the opening of the heat vibrator. Fig. 1 and Fig. 3 are longitudinal cross-sectional views showing the state in which the opening of the heat vibrator is sealed. be. 100. heat pipe, 200. Opening part of heat pipe 1, 3... outer diameter male screw of fist opening part 2, 4 fist... hydraulic fluid filling device, 5... female screw of hydraulic fluid filling device 4. 6...Q IJ song 7...Cylinder of hydraulic fluid filling device 4, 811...Piston, 9...U cup-shaped soft polyethylene, 10...Vacuum circuit, 11...Pulp, 12... - Vacuum pump - 13... Working fluid filling circuit, 14... Valve, 15... Working fluid filling machine - 16 T-shaped plug - 220 - Open end of heat pipe 1. 23...Fist wick, 24@...Welding part. Procedure amendment book Showa! Shima, Commissioner of the Patent Office, July 1997, 1) Haruki Tono1, Indication of the incident, Showa 3G, Patent Application No. 1S69, No. 9, 2, Name of the invention: Filling a heat pipe with working fluid and sealing the opening. Method 3. Relationship with the person making the amendment Patent applicant 4. Agent address Zip code /71 5. Date of amendment order Voluntary amendment 6. Detailed description of the invention and brief description of the drawings in the specification to be amended Column 7, Contents of amendment (1) "Figure 1 is a longitudinal cross-section showing the state in which the hydraulic fluid filling device is temporarily attached to the heat pipe opening" in page 9, line 73 to line 1a of the specification. The following has been corrected: ``Figure 1 is a vertical cross-sectional view showing the state in which the hydraulic fluid filling device is temporarily attached to the heat pipe opening and the heat pipe is filled with hydraulic fluid after creating a vacuum inside the heat pipe.'' (2) On page 1 of the specification, line 2 to line 1O, ``Figure 1 is a vertical cross-sectional view showing a state in which the hydraulic fluid filling device is temporarily attached to the heat pipe opening'' has been replaced with ``Figure 7 is the heat pipe. Corrected to ``Longitudinal cross-sectional view showing the state in which the hydraulic fluid filling device is temporarily attached to the pipe opening and the hydraulic fluid is filled after creating a vacuum inside the heat pipe.''

Claims (1)

[Claims] A cylinder having approximately the same diameter as the inner diameter of the heat pipe, and a cylinder having a diameter approximately the same as the inner diameter of the heat pipe, and a cylinder having a vacuum circuit and a working fluid filling circuit provided with a part that temporarily adheres to the outer diameter of the heat pipe opening and a pulp that can be opened and closed, and an appropriate operating mechanism at one end of the cylinder. A hydraulic fluid filling device having a piston that moves back and forth in the cylinder, with an elastic body capable of temporarily sealing the inner diameter of the heat pipe or a plug having an elastic body in close contact with the piston, the heat pipe is opened. Temporarily contact the hole, activate the vacuum circuit to create a vacuum inside the heat pipe, first activate the hydraulic fluid filling circuit to fill the heat pipe with hydraulic fluid, then activate the piston to make the elastic body elastic. A plug having a body is press-fitted into the heat pipe opening, and the plate is sealed, and the working fluid filling device is removed.Then, the bottomed cylindrical body or the plug is welded to the heat pipe opening. A method that completely seals the heat pipe by filling the heat pipe with working fluid and sealing the opening.