JPS6020085A - Insertion work of heat pipe - Google Patents

Abstract

PURPOSE:To facilitate the insertion work by a method wherein a container is sealed after pipe-expanding liquid has been charged in said container of a heat pipe and inserted in a hollow metal pipe and, after that, the pipe-expanding liquid is heated up to the predetermined temperature. CONSTITUTION:A container 1 is sealed at its temporary sealing part 8 after pipe-expanding liquid 4-1 has been charged in the container 1 of a heat pipe. After that, the container 1 is inserted in a hollow metal pipe 5 and then the pipe-expanding liquid 4-1 is heated up to the predetermined temperature so as to expand the container 1 in order for the container 1 to be inserted to the hollow metal pipe 5. Due to the method as mentioned above, the similar adherence to the shrinkage fit between metals can be obtained with a simple operation and yet without employing any special device.

Description

DETAILED DESCRIPTION OF THE INVENTION When using a heat pipe, the present invention provides a method for inserting the heat absorbing portion and the heat dissipating portion into the insertion holes of the object to be cooled and the object to be heated, or connecting the heat pipe and the heat absorbing component or the heat dissipating component. The present invention relates to a method of inserting and connecting heat pipes to each other.

A heat pipe is an excellent heat transfer device with extremely low thermal resistance, but when using it, it is necessary to adhere the surface of the heat absorption part and the surface of the heat radiation part to an object to be cooled or an object to be heated in order to absorb or radiate heat.

Also, if it is not due to such contact heat transfer, is there heat? Heat absorbing and dissipating fins are inserted into the first pipe to perform heat exchange through the heat medium fluid. In either case, it is necessary to bond the heat pipe, the object to be cooled, and the object to be heated, or the heat pipe and the fins to each other. Also, in order to increase the mechanical strength of the heat pipe, the heat pipe is sometimes inserted and bonded into a hollow tube made of strong material. Although brazing or pressurized contact may be used as the bonding means, the most commonly used bonding method is an insertion method using press-fitting or insertion.

However, due to its principle, a heat pipe is usually formed of an A-empty container made of a thin-walled soft attachment, so its mechanical strength is low, and it is difficult to press fit or insert the heat pipe with a large pressure. Furthermore, due to the manufacturing process of heat pipes, it is usually difficult to precisely manufacture the external shape of the heat pipe, and even if the heat pipe is manufactured precisely with great care, it is easily deformed due to its structure. . In many cases, conventional insertion and connection methods for these salt mines resulted in air remaining in the connection section, resulting in large thermal resistance. As a means to eliminate such defects, there are generally methods of injecting molten low-melting point metal into the gap between the insertion parts, a method of machining the welded object into an m-tube after insertion to increase the degree of adhesion, and a method of working as a heat pipe. A method has been adopted to improve the degree of adhesion by expanding the container with still-pressure liquid in the process before pressurizing the liquid. However, all of these insertion methods not only required special German equipment, but also required great skill. In addition, when inserting a group of fins into a heat pipe, each fin slides from the end of the heat pipe on the surface of the heat pipe, and the insertion holes of the fins tend to be enlarged, making it difficult to obtain strong efficiency and contact. In Europe, fin efficiency often decreased due to thermal resistance.

The present invention improves all the shortcomings of the various conventional heat pipe insertion methods as described above, is extremely simple to operate, does not require any special equipment, and is capable of shrink fitting between metals. The present invention aims to provide a new method for inserting and connecting heat pipes that can achieve similar layer density.

As for the connection of heat pipes, there are an almost infinite number of possible combinations of the objects to be inserted and connected, but in the present invention, the heat pipe is inserted into a hollow tube to generate a power output of 2 mW in one bottle.
Forming a heat pipe for a container or inserting a heat pipe into a rotating shaft to form a rotating shaft with good heat dissipation 2
The heat pipe according to the present invention will be explained based on two examples: a method for inserting and connecting heat pipes in forming a heat pipe with a multi-pipe structure, and a method for mutually inserting and connecting fins and a heat pipe when forming a group of radiation fins in a predetermined portion of a heat pipe. The method of inserting the eve will be explained in detail with reference to the drawings.

1, 2, and 3 show the procedure for inserting a heat pipe according to the present invention into a hollow metal tube, and FIG. This figure shows the state in which heat dissipation fins are inserted into predetermined portions. The numbers assigned to each part are common to all drawings.

FIG. 1 is a sectional view showing a preparatory stage of the heat pipe insertion method according to the present invention. 1 is a container, and its basic structure as a heat pipe is a thin-walled hollow gold F4 tube, and as a general rule, a material with good thermal conductivity is used as the metal material. Therefore, copper, aluminum, etc. are often used, and stainless steel, Niraglu, etc. may also be used. However, copper is most desirable for the purpose of achieving good thermal conductivity. Therefore, in general, the container 1 has good exhibitability but low mechanical strength. In the welding method according to the present invention, this point is utilized to expand the container and form a pressurized dense layer at the welding portion of the welded object. Reference numeral 2 denotes the edge of the container, which is made thick to prevent deformation during pipe expansion work. If it is necessary to form the end edge portion thinly, it is desirable to form the end edge into the shape of:bROii in order to withstand the tube expansion pressure during tube expansion work.

Reference numeral 3 denotes a hydraulic fluid injection thin tube section, which is used to inject a tube expansion liquid into the container, inject the hydraulic fluid, and discharge non-condensable gas inside the container. 4-1 is a predetermined number of objects for reinforcement, which are filled to the full in the container. Injection of the liquid is carried out before the step of injecting the working liquid, and cleaning of the container and the like are all carried out in the state of photons.

It is desirable to use a liquid with a large coefficient of thermal expansion as the liquid, and its complete removal is extremely easy and can be carried out in the next step. 1fI] A liquid that does not interfere with the liquid injection process is desirable. Although it is most desirable to use the hydraulic fluid used in the next step as the tube expansion liquid, this may not be possible depending on the tube expansion conditions described below.

Reference numeral 8 denotes a temporary sealing portion of the injection capillary, which is airtightly sealed so as to sufficiently withstand the internal pressure during the tube expansion operation.

In short, the preparatory work for the heat pipe insertion method according to the present invention illustrated in FIG. 1 is extremely simple, just filling the pipe with liquid for expanding the pipe and temporarily fixing it.

The safest and cheapest source of water is pure water, and if the working fluid of the heat pipe to be used in the Type 15 is pure water, the container cleaning process of the insertion photon-shun is unnecessary and the excess operation is simply carried out. There are advantages to simply draining the liquid.

FIG. 2 is a sectional view showing one of the heat pipe insertion stages. The container 1, which has undergone the preparation steps shown in FIG. 1, is inserted into the hollow metal tube 5 and the whole is heated to a predetermined temperature. Reference numeral 6 denotes a stopper as means for restricting expansion 1 in the longitudinal direction of the container. Since the coefficient of body expansion of the liquid for pipe expansion is constant, the expansion of the liquid in the longitudinal direction is restricted by the stopper 6, and the expansion in the diametrical direction is increased, thereby greatly increasing the adhesion force between the hollow metal pipe and the container. . The arrows in the figure indicate the internal pressure generated due to the difference in expansion coefficient between the tube expansion injection liquid, the container, and the hollow metal tube. The internal pressure generated by the expansion of the liquid is extremely strong, and unless the metal tube expands and the internal pressure is released, it will increase as the temperature rises and reach an ultra-high pressure state.In other words, the container and the metal tube will surely reach the expanded volume of the liquid. The tubes were expanded. Therefore, the container is crimped and integrated with the inner wall of the hollow metal tube at a pressure equal to the pressure resistance of the hollow metal tube.

The expansion of liquid is sufficiently larger than that of metal, so even if the outer diameter of the container and the inner diameter of the entire hollow tube are formed to have a diameter difference that allows insertion with a light pressure, the entire container must be heated. For example, the expansion of the liquid can easily eliminate this gap, and the container can be pressure-adhered to the inner wall of the hollow metal tube.The material of the container and the hollow metal tube is copper, and the expansion liquid is pure water, and the container wall thickness is ignored to simplify calculations. Furthermore, if the heating rise moist layer is 100'C from room temperature 20C,
The average body expansion coefficient between ゛C and 1200 is 0.6 x 10
"-" D/C), that is, the approximate coefficient of linear expansion is 0.2
10-” [:1/C), that is, the approximate linear expansion coefficient is 0.
When 2 x 10 [1/'C], the diameter is 20 u
The diameter increase of water in a container of n is 20 rttsa x
O, 2x'l0-x 100 = 0. '4IIs. Increasing the diameter of the inner wall of the container and gold is due to the coefficient of linear expansion of copper being (j, o 168 x '10-3 [1/C], so 20 + d x 010168 x 10-"
X 1 'OO = only 0.0336 cranes, so even if the gap at the time of insertion is set to 0.11/IJ, the pure water in the container will not only eliminate the gap but also become hollow due to the tube expansion of 0.27 r. It will be pressed against the inner wall of the metal tube.

If it is desired to further increase the pressurizing force during tube expansion and insertion, or to further increase the gap during insertion to make the work easier, the injection liquid for tube expansion may be changed to a liquid with a higher expansion coefficient. For example, methyl alcohol # H body swelling Ill coefficient i F20℃ D: k ite 1.2 X 10-" [: 1/"
C] Approximate coefficient of linear expansion is 0.4 x 10 C1/”C
] is twice that of pure water, and the diameter of the container in the above example can be increased by 0.8 times. Moreover, this makes it possible to carry out the pipe expansion work efficiently even at a temperature rise as low as 70°C.

As a means of raising the temperature during insertion work, immersion in heated water below the boiling point has high heating efficiency, is safe, and is also amphibious, so we recommend a heat pipe insertion method for liquid expansion orifices. This is an extremely desirable means of implementation.

Also, even when using heated water as a temperature raising means, the water temperature should be kept at 5.
In many cases, it is desirable to carry out the operation at a temperature below 0 ''C from the point of view of workability.Also, when ammonia liquid is used as the tube expansion liquid and the drawing liquid is used for actual firing, its saturated vapor pressure is i o o
``The pressure can reach as high as 60 atmospheres at C, making the work extremely dangerous.

In this case, it is desirable to limit the upper limit temperature to 2501 and the saturated vapor pressure to 10 atm or less. In these cases, if the initial temperature of the liquid is set to room temperature, sufficient liquid expansion will not be possible due to insufficient change in temperature. In such a case, a sufficient temperature difference can be obtained by filling the container with a tube-expanding liquid that has been cooled to a low temperature of several tens of degrees below zero. As such a liquid for low-temperature pipe expansion, it is desirable to use larylethyl alcohol, methyl alcohol, freon, ammonia, etc., which are generally used as a working fluid for low-temperature heat pipes.

These materials have the characteristic that they are extremely easy to discharge and clean after the completion of the insertion work, and can be completely removed only by sufficient heating. Also, ammonia liquid has a thermal expansion coefficient of 20' CI
Since the C is extremely large, T-2, 45x 10 C1/''C], a large pressure during insertion can be obtained with a relatively small temperature difference.

Furthermore, when using such a low-temperature tube expansion liquid, the container itself will undergo significant heat shrinkage, so there is no need to make the outer diameter of the container much smaller than the inner diameter of the welding hole of the object to be welded. The pressurizing force generated between the inner wall of the insertion hole and the outer wall of the container is the resultant force of the liquid expansion and the gold H4 expansion of the container, and becomes extremely strong.

FIG. 3 is a sectional view showing the state of the double hollow metal tube after the heat pipe has been inserted and connected. In the figure 4-2 c
'i After the pipe expansion liquid 4-1 is completely discharged and removed using the working fluid of the heat pipe, a predetermined amount of the working fluid is poured into the heat pipe. Reference numeral 9 is a sealing part, and after the insertion of the front balls 4 and 1 is completed, the temporary sealing part 8 is unsealed, a predetermined amount of hydraulic fluid is injected into the container, and then welding, brazing, etc. The device is completely sealed. Is it full in the previous process? a'j If hydraulic fluid is used for the filled pipe expansion liquid 4-1, the work of discharging the pipe expansion liquid 4-1 and the 7# offshore work in the container will be omitted in the hydraulic fluid injection and quantification work. The double-tube structure heat pipe shown in FIG. 3 can be completed by simply discharging the excess amount of working fluid.

FIG. 4 is a partial sectional view showing a state in which the 747 group 5 is inserted into the portion 1-2 of the heat pipe container by applying the heat pipe insertion method according to the present invention. In this case, an example is shown in which by expanding only the necessary portion 1-2 of the container, the expansion rate of the portion 1-2 is increased compared to the case where the entire container is expanded. In the figure, the pipe expansion liquid 4-1 has already been discharged, but if the filled liquid is heated and expanded, the amount of liquid equivalent to the amount of working fluid in the part 1-1 where pipe expansion is restricted will be 1. By moving to the -2 section, the tube diameter expansion rate of this section can be doubled. As a means to prevent pipe expansion in the 1-1 portion of the container, if the present invention is carried out by increasing the container wall thickness in this portion or thinning the wall thickness in the 1-2 portion, the tube expansion action will be concentrated in the 1-2 portion. It can be generated. However, in this case as well, a slight expansion occurs in the 1-1 section, so in order to completely prevent the tube expansion in the 1-1 section, it is necessary to use a tube expansion prevention means 7 as illustrated in FIG. 4. In the figure, a mold with a separable structure is shown in container 1.
-1 section is used as a means to prevent tube expansion. Generally, the insertion of the fin group is carried out by sequentially press-fitting the fins with insertion holes from one end of the container.

In this case, each fin must be moved to a predetermined position by sliding on the outer peripheral surface of the container. Heat nozzle (The outer diameter of the fin is not processed very precisely, and if the flat plate fins are slightly tilted, the fin insertion hole will be deformed. Also, the material of the fin is generally used to improve heat transfer.) is a thin copper plate,
Thin aluminum plates are used and are easily deformed when sliding on the surface of the container. From these points, it has been difficult to insert fins reliably and with strong adhesion strength using conventional fin insertion methods.

However, the gain inserted by the insertion method according to the present invention expands the container after positioning the fin groups at their respective predetermined positions and makes the container tightly fit, so the fins are firmly and tightly inserted and the connection is secured. A group of fins with extremely low insect heat resistance and high performance can be formed by a simple work procedure.

If the metal container and the object to be inserted are made of different metal materials, and the coefficient of thermal expansion of the container is greater than that of the object to be inserted, if the two are heated to a high temperature and then pressure-welded, it will not work at high temperatures. Even if they are once pressure-welded, when the container is returned to room temperature, the shrinkage rate of the container is large, and the connection between the two may become loose. As a countermeasure in such a case, the insertion part of the object to be inserted is formed into an elastic structure so that the expansion of the container is kept within its elastic limit, and the diameter remains within its elastic limit even when the container contracts. implement. As an example, burring is applied to the insertion hole of the fin to prevent expansion of the container.
This is done so that the change in outer diameter during contraction is kept within the elastic limit of the burring part.

In addition, as a countermeasure against ponding, when filling the container with a low-temperature liquid as the injection liquid for C1 expansion, the liquid temperature should be set to 0'C.
The pipe expansion and insertion temperature is limited to below room temperature as follows.

Furthermore, as another measure, a thin film of soft metal such as solder alloy is interposed between the container and the object to be inserted, and the heat pipe insertion method according to the present invention is implemented, and the outer surface of the container is The inner walls of the insertion hole and the insertion hole of the object to be inserted and welded are completely pressed against each other to prevent loosening when the container is contracted at room temperature.

Although the wick is not shown in the cross-sectional views of the single dopipe illustrated in each figure, the heat pipe insertion method according to the present invention can be carried out in the same manner regardless of whether or not there is a wick. However, as the inner wall of the container expands, the diameter of the wick also needs to expand, so a type of heat pipe in which the wick and the inner wall of the container are bonded or integrated is not a problem, but caution should be taken with the elasticity of the wick support. In the case of a heat pipe in which the wick is supported by being pressed against the inner wall of the container, it is necessary to use a support made of a material with sufficient elasticity to push and expand the wick in response to the expansion of the inner wall of the container. There is.

As mentioned above, the heat pipe insertion method according to the present invention is an extremely simple working method, does not require any particularly expensive equipment or jigs, and is an insertion method that allows reliable insertion. I can do it. In particular, the fin insertion method is different from the conventional method of press-fitting each fin one by one, by inserting and positioning a large number of fins with a loose fit, and press-fitting them all at once by enlarging the container. This method not only makes it possible to increase the strength of the insertion force and omit a complicated and expensive fin press-fitting device, but also eliminates the need to consider the strength for press-fitting the fin flat plate since it is not necessary to press-fit the fins. Therefore, it is possible to significantly reduce the thickness of the fins, which has many effects such as preventing a drop in cooling air pressure and increasing the heat transfer area by increasing the number of fins that can be inserted, resulting in revolutionary improvements. You can.

4. 1"P of the drawings) Simple explanation FIGS. 1 to 4 show the method of inserting and connecting the heat pipe according to the present invention, and FIGS. 1 to 3 show the method of inserting and connecting the heat pipe according to the present invention. FIG. 4 is a sectional view showing the insertion procedure, and FIG. 4 is a partial sectional view showing the state in which the fin group is inserted into the heat pipe.

1... Container, 2... Container edge, 3...
Working fluid injection thin tube section, 4-1...Liquid for tube expansion, 4-2.
... Hydraulic fluid, 5... Hollow metal tube, 6... Stopper,
7... Tube expansion prevention means, 8... Temporary sealing part, 9... Sealing part.

Claims (1)

[Scope of Claims] (1) A method for inserting and mounting a heat pipe into a predetermined object to be inserted, the method comprising: inserting and mounting a heat pipe into a predetermined object to be inserted; ,
The heat pipe container is temporarily filled with a specified liquid that does not adversely affect the working fluid injection work while maintaining a specified low temperature, and a specified portion of the container is covered. After the object is inserted into the insertion part of the insertion object, the object to be inserted, the container, and the liquid filled in the container are heated to a predetermined temperature by a predetermined means to cause thermal expansion, and the coefficient of thermal expansion of the liquid is adjusted. The container is expanded due to the difference in thermal expansion coefficient between the container and the object to be inserted, and the container is pressurized to the insertion part of the object to be inserted, and then the temporary seal of the container is released. A method for inserting and connecting a heat pipe, characterized in that the filling liquid is removed in a predetermined step, and then a predetermined amount of hydraulic fluid is injected in a predetermined hydraulic fluid injection step to seal the container. (2. In the heat pipe insertion method described in claim 1, the predetermined liquid for filling the container with 4'ti4 lights is a working fluid that is to be injected in a fixed amount in the process of manufacturing the heat pipe. A heat pipe insertion method characterized in that the final process, which is the hydraulic fluid injection step, is carried out by eliminating and quantifying the excess amount of the hydraulic fluid that has been filled. (3) ) The method for inserting and connecting heat pipes as set forth in claim 1 is characterized in that the heat pipe container is carried out in combination with longitudinal expansion limiting means for preventing the heat pipe container from elongating in the longitudinal direction. (4) The heat pipe insertion method according to claim 1, characterized in that the method is carried out by providing a tube expansion prevention means in a portion of the heat pipe container that does not require tube expansion. (5) In the heat pipe insertion method described in QJF Claim 1, the pressed portion of the heat pipe container is formed to be relatively thinner than the non-inserted portion. (6) In the heat pipe insertion method according to claim 1, the tube expanding liquid to be fully filled into the container is heated to a predetermined temperature below zero. A heat pipe insertion method characterized by cooling the heat pipe to a low temperature and then injecting the heat pipe.