JP2007024369A - Method of manufacturing heat transporting pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a heat transporting pipe capable of allowing a prescribed amount of working fluid to be charged and sealed in a container of the heat transporting pipe with high accuracy. <P>SOLUTION: An opening portion 13 of the container 11 having an empty pipe conduit 12 is communicated with a noncondensable gas 2 of prescribed pressure P1 lower than atmospheric pressure to fill the pipe conduit 12 with the noncondensable gas 15 of the pressure P1, then the opening portion 13 of the container 11 is communicated with the working fluid 4 under atmospheric pressure, to fill the pipe conduit 12 with the working fluid 16 by pressure difference between the pressure of noncondensable gas 15 in the pipe conduit 12 and the atmospheric air, further the working fluid 16 in the pipe conduit 12 is solidified, then the opening portion 13 of the container 11 is placed under vacuum 6 to eliminate the noncondensable gas 15 in the pipe conduit 12, and the opening portion 13 is closed, thus the heat transporting pipe 10 is manufactured. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a heat transport tube by enclosing a predetermined amount of working fluid in a container.

  A heat transport pipe (also referred to as a heat pipe) performs heat transport through a working fluid sealed in a container. For example, Patent Literatures 1 to 4 are cited as conventional literatures that describe techniques related to sealing of working fluid when manufacturing a heat transport pipe. In recent years, heat transport pipes having meandering thin tubes have been developed as pipes through which the working fluid moves. Examples of methods for producing containers used for this type of heat transport pipe include Patent Documents 5 and 6.

Patent Document 1 describes a method of enclosing a working fluid in which the working fluid is put in a container in the form of an ice block and then the container is evacuated to close the opening of the container.
Patent Document 2 discloses a non-condensable gas recovery container that is suitable for a case where a high-boiling working fluid is used, in which the working fluid is injected into the container and then the inlet of the container is evacuated via an exhaust pipe. The working fluid sealing method is described in which the working fluid in the container is evaporated under reduced pressure to remove the non-condensable gas in the container, and then the inlet of the container is sealed.
In Patent Document 3, after injecting a working fluid into a container, the container into which the working fluid is injected is heated by a non-contact type heating means to evaporate the internal working fluid, and the weight of the container containing the working fluid is measured. A working fluid sealing method is described in which the weight of the working fluid remaining in the container is always calculated based on the value, and the container is sealed when the calculated value reaches a predetermined value.
In Patent Document 4, after injecting a working fluid into a container, the container in which the working fluid is injected is exhausted by a pump to evaporate the internal working fluid, and the operation remaining in the container based on the measured value of the exhaust amount. A method of enclosing a working fluid is described in which the weight of the fluid is estimated and the container is sealed when the estimated value reaches a predetermined value.
In Patent Document 5, the partition walls of the through-hole group are excised from the end faces of both ends of the porous flat tube by a predetermined depth every other line, and then the excised part has a length of 1 to 3 mm from the deepest part. A method for manufacturing a container for a heat transport pipe is described in which the end edges of both ends of a flat tube are crushed without being crushed, and then the crushed edges are welded and sealed.
In Patent Document 6, both end faces of a long plate having a through-thin channel group are welded and sealed, and a part of a partition wall between channels is cut by cutting from the plate surface side, and then the opening is sealed by welding. The manufacturing method of the container for heat transport pipes is described.
JP 2000-249482 A JP 2004-239466 A JP-A-8-136172 JP-A-8-136171 JP 2001-272188 A JP 2001-241870 A

  In the heat transport pipe, it is required that non-condensable gas such as air does not remain inside the container. In addition, if there is a variation in the amount of the working fluid sealed, the heat transport performance varies, so it is desirable to control the amount of the working fluid sealed with high accuracy. However, with the conventional method of enclosing the working fluid, it has been difficult to accurately enclose and enclose the non-condensable gas while controlling the amount of enclosure.

  This invention is made | formed in view of the said situation, and makes it a subject to provide the manufacturing method of the heat transport pipe | tube which can enclose the predetermined amount of working fluid in a container easily and with high precision.

In order to solve the above-mentioned problem, an invention according to claim 1 is directed to a container having an internally formed conduit and at least one opening communicating with the conduit, and a predetermined amount of operation enclosed in the conduit. A method for producing a heat transport pipe comprising a fluid, wherein at least one opening of a container having an empty pipe line is passed through a non-condensable gas having a predetermined pressure P ₁ lower than atmospheric pressure, and the pipe line is passed through the pipe. A non-condensable gas filling step of filling the non-condensable gas at pressure P ₁ and then closing the opening; and at least one opening of the vessel filled with the non-condensable gas at pressure P ₁ Through the working fluid under atmospheric pressure, and without leaking the non-condensable gas in the pipe, fill the pipe with the working fluid according to the pressure difference between the pressure of the non-condensable gas in the pipe and the atmospheric pressure. Working fluid filling process and working fluid freezing to solidify the working fluid in the pipeline A degassing step of closing at least one opening of the container having the working fluid solidified in the pipe line under vacuum, removing the non-condensable gas in the pipe line, and then closing the opening; It is characterized by having.

  The invention according to claim 2 is the method for manufacturing a heat transport pipe according to claim 1, wherein the opening is formed in a gas phase portion in the pipe line between the working fluid filling step and the working fluid freezing step. It is characterized by having a working fluid movement process which moves working fluid in a pipe line along a pipe line until it communicates.

  The invention according to claim 3 is the method for manufacturing the heat transport pipe according to claim 2, wherein a container having only one opening leading to the pipe line is used.

  The invention according to claim 4 is the method for manufacturing the heat transport pipe according to claim 1, wherein a container having at least one filling port and one deaeration port is used as the opening leading to the pipe line, and the working fluid is filled. In the process, the working fluid is filled through the filling port with the degassing port closed, and the non-condensable gas is removed through the degassing port in the degassing step with the filling port closed.

According to the present invention, the amount of working fluid enclosed can be easily and highly accurately controlled by the non-condensable gas having the pressure P ₁ filled in the pipe in advance. Further, by evacuating the inside of the pipe line after freezing the working fluid, the non-condensable gas in the pipe line including the non-condensable gas dissolved in the working fluid can be surely removed.

  A heat transport pipe manufactured according to the present invention includes a pipe formed inside, a container having at least one opening communicating with the pipe, and a predetermined amount of working fluid sealed in the pipe. Is. The material of the container is not particularly limited as long as it can be used in the field of heat transport pipes, and examples thereof include aluminum, aluminum alloy, magnesium alloy, stainless steel, copper, and copper alloy.

  The shape of the conduit formed in the container is not particularly limited, and examples thereof include a straight type, a loop type, and a meandering type. The pipe line may form an open channel having both ends at different positions of the container, or may form an endless closed channel (loop type channel).

  The conduit is provided with at least one opening. The opening communicates the inside of the pipe line and the outer space of the container. In the final heat transport pipe, the opening is closed and sealed. The number, position, shape, dimensions (opening cross-sectional area), and the like of the openings are not particularly limited, and can be appropriately set as necessary.

  The means for closing the opening is not particularly limited, and for example, a member serving as a lid for the opening may be used separately from the container, or a method of closing by closing the end of the container may be used. Various methods are used to join the lid to the opening, such as fitting and engagement, screwing with screws, bonding with an adhesive, adhesion using an adhesive, and crimping using a metal rod. Is possible. In the case where it is necessary to open and close the opening during the manufacturing process of the heat transport pipe, a detachable closing means by fitting, engagement, screwing or the like is used.

  The working fluid is not particularly limited as long as it can be used in the field of heat transport pipes, and can be appropriately selected according to conditions such as a use temperature. Specific examples of the working fluid include fluorochlorocarbon (CFC), hydrofluorochlorocarbon (HCFC), hydrofluorocarbon (HFC), water, liquid metal, hydrocarbon, alcohols, and the like.

In the present invention, the non-condensable gas used for filling the pipeline may be any gas that does not condense under the manufacturing conditions of the heat transport pipe, particularly under the condition of freezing the working fluid. Specific examples include nitrogen gas (N ₂ ), oxygen gas (O ₂ ), carbon dioxide gas (CO ₂ ), or a mixed gas thereof (for example, air). Of these, air is preferred because it is readily available. If necessary, clean air from which foreign matter such as dust is removed through a filter or the like may be used.

  Next, the respective steps for enclosing a predetermined amount of working fluid in the conduit of the container by the manufacturing method of the present invention will be described in order.

(Non-condensable gas filling process)
First, a container having an empty pipe line is prepared, and the pipe line of the container is filled with a non-condensable gas (for example, air) having a predetermined pressure P ₁ lower than atmospheric pressure. To maintain the pressure in the line to P _1, closes the opening after filling. As an example of a method for efficiently carrying out this process, a decompression furnace (decompression container) that can accommodate the entire container of the heat transport pipe is prepared, and the decompression furnace is filled with an atmospheric non-condensable gas and heated. After the bottle was placed in transport tube, and evacuating the interior of the vacuum furnace, method of pressure reduction and the like to a pressure P _1. After filling, after closing the opening in the vacuum furnace, a non-condensable gas is introduced into the vacuum furnace, the internal pressure of the vacuum furnace is returned to atmospheric pressure, and the container is taken out. As a method of closing the opening in the vacuum furnace, a flexible glove may be attached to the vacuum furnace so that it can be operated manually from the outside of the vacuum furnace, or the opening is closed inside the vacuum furnace. A device to perform may be installed. Alternatively instead of using a vacuum oven, to prepare an exhaust pipe was maintained at a pressure P _1, by connecting the opening of the container and the exhaust pipe, it is possible to achieve the purpose. The purpose of mass production includes a method of increasing the number of containers accommodated in the decompression furnace at a time or increasing the number of containers connected to the exhaust pipe at a time using a plurality of exhaust pipes branched.

(Working fluid filling process)
When at least one opening of the vessel filled with the non-condensable gas at the pressure P ₁ is opened and the opening is communicated with the working fluid under atmospheric pressure, the non-condensable in the pipe The working fluid flows into the pipe line according to the pressure difference between the gas pressure and the atmospheric pressure. When the pressure of the non-condensable gas in the pipeline is balanced with the atmospheric pressure by flowing the working fluid so that the non-condensable gas in the pipeline does not leak from the opening, the working fluid and the non-condensable gas Occupies the space in the pipe line at a constant volume ratio, so that a predetermined amount of working fluid can be easily filled.

  As a method of supplying the working fluid to the opening of the container, a method of preparing a bathtub (working fluid supply container) storing the working fluid and immersing a portion including the opening of the container in the bathtub, a fountain type Various methods such as a method of inserting the opening of the container into the discharged working fluid flow, a method of preparing a supply pipe for supplying the working fluid and connecting the supply pipe to the opening of the container can be adopted. It is.

Here, a method for simply calculating the volume filling rate in which the working fluid is sealed will be described.
The temperatures of the non-condensable gas and the working fluid are both set to a constant temperature T ₀ . If the internal volume of the container is V and the specific gas constant of the non-condensable gas is R, the mass m of the non-condensable gas remaining in the pipe does not change before and after the filling of the working fluid, and the equation (1) Is represented by

m = P ₁ V / RT ₀ (1)

For simplicity, if ignoring head pressure of the working fluid, the pressure of the gas phase portion of the conduit after completion of the filling is equal to the atmospheric pressure P _0. Moreover, after completion of filling, the gas phase portion in the pipe line is composed of saturated vapor of the working fluid and non-condensable gas of mass m. When the saturated vapor pressure of the working fluid at the temperature T ₀ is P _sat , the partial pressure of the non-condensable gas in the pipeline after the completion of filling is equal to P ₀ -P _sat . Therefore, when the total volume of the gas phase portion in the pipe line after completion of filling is V _vap , Equation (2) is established for the non-condensable gas in the pipe line after completion of filling.

(P ₀ −P _sat ) V _vap = mRT ₀ (2)

The volume filling rate is defined by the ratio of the volume of the liquid phase portion of the working fluid to the inner volume of the container. At this time, the volume filling rate of the working fluid is represented by 1- (V _vap / V). When the equation (1) is substituted into the equation (2) and deformed, the volume filling rate is expressed by the equation (3).

1- (V _vap / V) = 1− {P ₁ / (P ₀ −P _sat )} (3)

Here, the pressure P ₁ can be freely set with high accuracy within the allowable range of the decompression furnace, and P _sat can be determined physically uniquely when the temperature of the working liquid is determined. Therefore, according to the present invention, it is possible to accurately control the volume filling rate of the working fluid.

Next, a method for preventing leakage of non-condensable gas when filling the working fluid will be described.
Generally, if the pipe diameter is about twice or more the Laplace length of the working fluid (depending on the type of working fluid, for example, around several millimeters), the working fluid in the pipe is a liquid column. The plug cannot be maintained, and the positions of the liquid phase portion and the gas phase portion in the pipeline can be freely moved in the pipeline by vibration, centrifugal force, gravity, or the like. In this case, in order to prevent leakage of non-condensable gas, before filling the working fluid, place the container so that the opening of the container faces downward in the direction of gravity, and immerse it in the working fluid with the opening closed. Then, the opening may be opened and closed in the working fluid while the opening is kept downward in the direction of gravity, and the working fluid may be filled. According to this method, since the opening of the container is directed downward in the gravity direction when the working fluid is filled, the non-condensable gas in the pipe line can be prevented from leaking from the container before and after filling.

  However, if the pipe line becomes narrower (for example, pipe diameter of about 1 mm or less), and the pipe diameter becomes less than twice the Laplace length of the working fluid, the liquid column plug is always maintained by the working fluid. Is done. In this case, the non-condensable gas does not flow out when the working fluid flows in from the opening regardless of the posture of the heat transport pipe container. Both can be filled so that non-condensable gas does not leak.

(Working fluid transfer process)
After filling, close the opening and take out the container, make the direction of the opening upward in the direction of gravity and then apply vibration to the container, or apply centrifugal force to the container with the opening on the rotating shaft side (inside) Thus, it is preferable to move the working fluid in the pipeline along the pipeline until the opening communicates with the gas phase portion in the pipeline. In particular, the movement of the working fluid is easier if the pipe diameter is about twice or more the Laplace length of the working fluid. In the working fluid moving step, the opening of the container may be opened, but it is preferable that all the openings of the container are closed in order to prevent leakage of the working fluid.

  On the other hand, when the pipe diameter of the pipe line is about twice or less the Laplace length of the working fluid, a stable liquid column plug is formed, and it may be difficult to move the working fluid. In this case, the working fluid moving process is not performed, and a container having at least one filling port and one degassing port is used as the opening leading to the pipeline, and the degassing port is closed in the working fluid filling process. The working fluid is filled through the mouth, and the non-condensable gas is removed through the degassing mouth with the filling port closed in a degassing step (described later). In this way, even if the filled working fluid cannot move, the implementation will not be hindered.

  In the case where there is a possibility that an air column plug in which a gas phase is confined between a plurality of liquid column plugs may be formed due to a gap between the liquid column plugs of the working fluid, It is necessary to provide an opening at a position where it can communicate with the air column plug so that the gas can be removed. When the position where the air column plug is formed can be predicted, an opening is provided at that position. In addition, when it is difficult to predict the position where the air column plug is formed, a large number of openings are provided in the container in advance, and only those openings that communicate with the air column plug are opened. In addition, by performing vacuum deaeration with the opening at a position communicating with the liquid column plug closed, it is possible to reliably remove the non-condensable gas without leaking the working fluid.

(Working fluid freezing process)
After performing the working fluid filling process, the working fluid freezing process for solidifying the working fluid in the pipe line is performed after performing the working fluid moving process or without performing the working fluid moving process. In order to solidify the working fluid, the container may be cooled below the freezing point of the working fluid. At this time, it is preferable to operate in a dry air atmosphere or to close all the openings of the container so that water vapor or the like in the atmosphere does not enter.

(Deaeration process)
After the working fluid is frozen, non-condensable gas in the conduit can be removed by passing under vacuum at least one opening of the container having the working fluid solidified in the conduit. In order to prevent outside air from entering the pipe, the opening is closed after deaeration. As an example of a method for performing this process efficiently, a vacuum furnace (vacuum deaeration container) that can accommodate the entire container of the heat transport pipe is prepared, and the vacuum furnace is filled with a non-condensable gas at atmospheric pressure. Then, after putting the container of the heat transport tube, the method of exhausting the inside of the vacuum furnace to a vacuum can be mentioned.

  After deaeration, after closing the opening in the vacuum furnace, a non-condensable gas (for example, outside air) is introduced into the vacuum furnace to return the internal pressure of the vacuum furnace to atmospheric pressure, and then the container is taken out. As a method for opening and closing the opening in the vacuum furnace, a flexible glove may be attached to the vacuum furnace so that it can be operated manually from the outside of the vacuum furnace, or the opening and closing work inside the vacuum furnace is performed. A device to perform may be installed. Alternatively, instead of using a vacuum furnace, an evacuation pipe that can be evacuated to vacuum is prepared and the opening of the container is connected to the evacuation pipe to evacuate the inside of the pipe. Can do. The purpose of mass production is to increase the number of containers accommodated in the vacuum furnace at once, or to increase the number of containers connected to the vacuum exhaust pipe at a time using a plurality of vacuum exhaust pipes. It is done.

  As described above, a heat transport pipe can be manufactured by enclosing a predetermined amount of working fluid in the container. When closing the opening after degassing, it is no longer necessary to reopen the opening, so it is desirable to ensure that the opening is sealed to maintain the airtight state of the heat transport tube.

According to the manufacturing method of the present invention, by filling the non-condensable gas of the pressure P ₁ prefilled in the pipe line before filling with the working fluid, and passing the opening to the working fluid under atmospheric pressure, The working fluid spontaneously flows into the pipeline. Moreover, by controlling the pressure P _1, it is possible to control the charging amount of working fluid with ease and high accuracy.
Further, by evacuating the inside of the pipe line after freezing the working fluid, the non-condensable gas in the pipe line including the non-condensable gas dissolved in the working fluid can be surely removed.

  Hereinafter, the present invention will be specifically described with reference to examples. In addition, this invention is not limited only to these Examples.

<Example 1>
A first embodiment of the present invention will be described with reference to FIG. In the heat transport pipe 10 manufactured in the first embodiment, as shown in FIG. 1 (i), the pipe line 12 formed inside the container 11 is a meandering narrow pipe, and the opening 13 communicated with the pipe line 12. One is provided. The first embodiment is suitable when the pipe 12 has a pipe diameter of about twice or less the Laplace length of the working fluid, and the working fluid in the pipe 12 can move freely along the pipe 12. .

(Non-condensable gas filling process)
FIG. 1A shows the container 11 in which the pipe 12 is empty. As shown in FIG. 1 (b), placed in an empty container 11 opening 13 is opened to vacuum furnace 1, reducing the pressure of the non-condensable gas 2 in the reduced pressure furnace 1 to a predetermined pressure P ₁ is lower than atmospheric pressure . As a result, the non-condensable gas 15 having the pressure P ₁ is filled in the pipe 12. Next, as shown in FIG. 1C, after the opening 13 of the container 11 is closed by the closing means 14 in the vacuum furnace 1, the container 11 is taken out from the vacuum furnace 1.

(Working fluid filling process)
Next, as shown in FIG. 1 (d), the opening 13 is closed while the opening 13 of the container 11 filled with the non-condensable gas 15 at the pressure P ₁ is closed by the closing means 14. The container 11 is immersed in the working fluid 4 under atmospheric pressure stored in the bathtub 3 with the gravity direction downward.
Next, as shown in FIG. 1 (e), when the opening 13 is opened in the working fluid 4 under atmospheric pressure, the pipe is in accordance with the pressure difference between the pressure of the non-condensable gas 15 in the pipe 12 and the atmospheric pressure. The working fluid 16 flows into the passage 12. Further, the opening 13 is closed again by the closing means 14 and then the container 11 is taken out of the bathtub 3, so that the working fluid 16 is introduced into the pipe 12 without leaking the non-condensable gas 15 in the pipe 12. Can be filled.

(Working fluid transfer process and working fluid freezing process)
Next, as shown in FIG. 1 (f), until the opening 13 communicates with the gas phase portion in the pipe line 12 by, for example, applying vibration to the container 11 after the opening 13 is directed upward in the gravity direction. The working fluid 16 in the pipe line 12 is moved along the pipe line 12. When the non-condensable gas 15 in the pipeline 12 is unevenly distributed to the position of the opening 13, the container 11 is cooled and the working fluid 16 in the pipeline 12 is solidified. The opening 13 may be opened before or after the container 11 is placed in the vacuum furnace 5.

(Deaeration process)
Next, as shown in FIG. 1 (g), the container 11 having the working fluid 16 solidified in the pipe 12 is placed in the vacuum furnace 5, and the working fluid 16 in the pipe 12 is solidified. By evacuating the interior of 5 and passing the opening 13 of the container 11 to the vacuum 6, the non-condensable gas in the conduit 12 is removed. Next, as shown in FIG. 1 (h), after the opening 13 of the container 11 is closed by the closing means 14 in the vacuum furnace 5, the container 11 is taken out from the vacuum furnace 5.

  As described above, the heat transport pipe 10 shown in FIG. 1I can be manufactured. In the obtained conduit 12 of the heat transport pipe 10, the sealed working liquid is divided into a liquid phase 16 and a gas phase (vapor) 17. After the container 11 is sealed, the liquid phase 16 and the gas phase 17 can be replaced with appropriate positions in the pipe 12 by repeating the evaporation and condensation cycle.

<Example 2>
A second embodiment of the present invention will be described with reference to FIG. In the heat transport pipe 20 manufactured in the second embodiment, as shown in FIG. 2 (i), the pipe line 22 formed inside the container 21 is a meandering narrow pipe, and an opening that leads to the pipe line 22 is used. One filling port 23 and one deaeration port 24 are provided. In the second embodiment, the pipe diameter of the pipe line 22 is about twice or less the Laplace length of the working fluid, and it is difficult for the working fluid in the pipe line 22 to move along the pipe line 22. Is preferred.

(Non-condensable gas filling process)
FIG. 2A shows the container 21 in which the inside of the pipe line 22 is empty. As shown in FIG. 2 (b), placed in an empty container 21 with an opening 23, 24 is opened to vacuum furnace 1, the non-condensable gas 2 until a predetermined pressure P ₁ is lower than atmospheric pressure in the reduced pressure furnace 1 Reduce pressure. As a result, the non-condensable gas 27 having the pressure P ₁ is filled in the pipe line 22. Next, as shown in FIG. 2 (c), after the openings 23 and 24 of the container 21 are closed by the closing means 25 and 26 in the vacuum furnace 1, the container 21 is taken out from the vacuum furnace 1. In FIG. 2B, both the filling port 23 and the deaeration port 24 are opened in the decompression furnace 1, but either one may be opened. Although not particularly illustrated, an opening for filling the non-condensable gas in addition to the filling port 23 and the deaeration port 24 may be provided separately, and this opening may be used.

(Working fluid filling process)
Next, as shown in FIG. 2D, the openings 23 and 24 of the container 21 filled with the non-condensable gas 27 having the pressure P ₁ in the pipe 22 are closed by the closing means 25 and 26, The container 21 is immersed in the working fluid 4 under atmospheric pressure stored in the bathtub 3 with the filling port 23 facing downward in the gravity direction.
Next, as shown in FIG. 2 (e), when the filling port 23 is opened in the openings 23 and 24 in the working fluid 4 under atmospheric pressure, the pressure of the non-condensable gas 27 in the conduit 22 is increased. The working fluid 28 flows into the pipe line 22 through the filling port 23 according to the pressure difference from the atmospheric pressure. Further, the filling port 23 is closed again by the closing means 25 and then the container 21 is taken out of the bathtub 3, so that the working fluid 28 is introduced into the pipeline 22 without leaking the non-condensable gas 27 in the pipeline 22. Can be filled.

(Working fluid freezing process)
Next, as shown in FIG. 2F, the container 21 is cooled to solidify the working fluid 28 in the pipe line 22 without moving the working fluid 28 in the pipe line 22 in particular. The opening of the deaeration port 24 in the opening may be performed before or after the container 21 is placed in the vacuum furnace 5.

(Deaeration process)
Next, as shown in FIG. 2 (g), the container 21 having the working fluid 28 solidified in the pipe line 22 is placed in the vacuum furnace 5, and the working fluid 28 in the pipe line 22 is solidified while the vacuum furnace 5 is evacuated and the deaeration port 24 of the container 21 is led to the vacuum 6 to remove the non-condensable gas in the pipe line 22. Next, as shown in FIG. 2 (h), after the deaeration port 24 of the container 21 is closed by the closing means 26 in the vacuum furnace 5, the container 21 is taken out from the vacuum furnace 5.

  As described above, the heat transport pipe 20 shown in FIG. 2I can be manufactured. In the obtained conduit 22 of the heat transport pipe 20, the sealed working liquid is divided into a liquid phase 28 and a gas phase (vapor) 29. After the container 21 is sealed, the liquid phase 28 and the gas phase 29 can be replaced with appropriate positions in the pipe line 22 by repeating the evaporation and condensation cycle.

<Example 3>
A third embodiment of the present invention will be described with reference to FIG. In the heat transport pipe 30 manufactured in the third embodiment, as shown in FIG. 3I, the pipe line 32 formed inside the container 31 is linear, and the opening 33 communicated with the pipe line 32. One is provided.

(Non-condensable gas filling process)
FIG. 3A shows the container 31 in which the pipe line 32 is empty. As shown in FIG. 3 (b), placed in an empty container 31 with an opening 33 is open to the vacuum furnace 1, reducing the pressure of the non-condensable gas 2 in the reduced pressure furnace 1 to a pressure P ₁ lower predetermined than atmospheric pressure . As a result, the non-condensable gas 35 having the pressure P ₁ is filled in the pipe line 32. Next, as shown in FIG. 3C, after the opening 33 of the container 31 is closed by the closing means 34 in the vacuum furnace 1, the container 31 is taken out from the vacuum furnace 1.

(Working fluid filling process)
Next, as shown in FIG. 3 (d), the opening 33 is closed while the opening 33 of the container 31 filled with the non-condensable gas 35 having the pressure P ₁ is closed by the closing means 34. The container 31 is immersed in the working fluid 4 under atmospheric pressure stored in the bathtub 3 with the gravity direction downward.
Next, as shown in FIG. 3 (e), when the opening 33 is opened in the working fluid 4 under atmospheric pressure, the tube is in accordance with the pressure difference between the pressure of the non-condensable gas 35 in the pipe 32 and the atmospheric pressure. The working fluid 36 flows into the passage 32. Further, the opening 33 is closed again by the closing means 34 and then the container 31 is taken out of the bathtub 3, so that the working fluid 36 is introduced into the pipe line 32 without leaking the non-condensable gas 35 in the pipe line 32. Can be filled.

(Working fluid transfer process and working fluid freezing process)
Next, as shown in FIG. 3 (f), when the opening 33 of the container 31 is directed upward in the direction of gravity, the working fluid 36 in the conduit 32 falls to the bottom side of the container 31. Furthermore, the container 31 is cooled to solidify the working fluid 36 in the pipe line 32. The opening 33 of the container 31 may be opened before or after the container 31 is placed in the vacuum furnace 5.

(Deaeration process)
Next, as shown in FIG. 3G, the container 31 having the working fluid 36 solidified in the pipe line 32 is put in the vacuum furnace 5, and the working fluid 36 in the pipe line 32 is solidified. 5 is evacuated and the opening 33 of the container 31 is led to the vacuum 6 to remove the non-condensable gas in the pipe line 32. Next, as shown in FIG. 3 (h), after the opening 33 of the container 31 is closed by the closing means 34 in the vacuum furnace 5, the container 31 is taken out from the vacuum furnace 5.

  As described above, the heat transport pipe 30 shown in FIG. 3I can be manufactured. In the obtained conduit 32 of the heat transport pipe 30, the sealed working liquid is divided into a liquid phase 36 and a gas phase (vapor) 37. Note that after the container 31 is sealed, the liquid phase 36 and the gas phase 37 can be replaced with appropriate positions in the pipe line 32 by repeating the evaporation and condensation cycle.

  According to the present invention, it is possible to enclose a working fluid in a large number of containers in a single process, and thus it is expected to realize mass production of heat transport pipes.

(A)-(i) It is explanatory drawing which shows each process of Example 1 of this invention in order. (A)-(i) It is explanatory drawing which shows each process of Example 2 of this invention in order. (A)-(i) It is explanatory drawing which shows each process of Example 3 of this invention in order.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Decompression furnace, 2 ... Non-condensable gas in a decompression furnace, 3 ... Bath, 4 ... Working fluid under atmospheric pressure, 5 ... Vacuum furnace, 6 ... Vacuum, 10 ... Heat transport pipe, 11 ... Container, 12 ... Pipes, 13 ... opening, 14 ... means for closing the opening, 15 ... non-condensable gas in the pipe, 16 ... working fluid (liquid phase) in the pipe, 17 ... vapor of working fluid in the pipe (Gas phase), 20 ... heat transport pipe, 21 ... container, 22 ... conduit, 23 ... filling port (opening), 24 ... deaeration port (opening), 25 ... closing means for filling port (opening) 26 ... Closing means for the deaeration port (opening), 27 ... Non-condensable gas in the pipe line, 28 ... Working fluid (liquid phase) in the pipe line, 29 ... Vapor of working fluid in the pipe line (gas) Phase), 30 ... heat transport pipe, 31 ... container, 32 ... pipe, 33 ... opening, 34 ... closing means for opening, 35 ... non-condensable gas in pipe, 36 ... working fluid in pipe (Liquid phase) 3 ... of the working fluid in the line vapor (gas phase).

Claims (4)

A method for manufacturing a heat transport pipe, comprising: a conduit formed inside and a container having at least one opening leading to the conduit; and a predetermined amount of working fluid sealed in the conduit,
At least one opening of a container having an empty pipe line is communicated with a non-condensable gas having a predetermined pressure P ₁ lower than atmospheric pressure, and the opening is filled with the non-condensable gas having a pressure P _1. A non-condensable gas filling step for closing the part;
At least one opening of the container filled with the non-condensable gas at the pressure P ₁ is passed through the working fluid under atmospheric pressure, and the pipe line is not leaked without leaking the non-condensable gas in the pipe line. A working fluid filling step of filling the working fluid into the pipe line according to the pressure difference between the pressure of the non-condensable gas in the inside and the atmospheric pressure;
A working fluid freezing step for solidifying the working fluid in the pipeline;
A deaeration step of passing at least one opening of the container having a solidified working fluid in a pipe line under vacuum, removing non-condensable gas in the pipe line, and then closing the opening;
A method for producing a heat transport pipe, comprising: It is a manufacturing method of the heat transport pipe according to claim 1,
Between the working fluid filling step and the working fluid freezing step, a working fluid moving step for moving the working fluid in the pipeline along the pipeline until the opening communicates with the gas phase portion in the pipeline. A method of manufacturing a heat transport pipe, characterized by the following. It is a manufacturing method of the heat transport pipe according to claim 2,
A method for producing a heat transport pipe, wherein a container having only one opening that leads to a pipe line is used. It is a manufacturing method of the heat transport pipe according to claim 1,
A container having at least one filling port and one deaeration port is used as the opening that leads to the pipe line, and in the working fluid filling step, the working fluid is filled through the filling port while the deaeration port is closed. A non-condensable gas is removed through a deaeration port while the filling port is closed.

Images