Production of heat transfer tube

[Detailed Description of the Invention]

"Field of the Invention" The present invention relates to the manufacturing method of heat exchanger tubes, such as a generating tube of a heat exchanger, a condenser tube, or a heat pipe. "PRIOR ART" above generating tube, condenser tube, and Hee 1 Kuibu -- any -- a pipe -- inside -- the phase transformation (gas-1 fluid) of the enclosed heat carrier is carried out by the difference in temperature of the inside and outside of a pipe, this medium is further transported to the longitudinal direction of a pipe, and Heat transfer is performed. For example, if an end part of a pipe is heated, a fluid will boil it, a heat pipe is what enclosed fluids, such as water or alcohol, in a decompressed metal tube, that steam flows into the other end (radiator), and condenses it, and it is designed so that this fluid may be transmitted in an inside of a pipe and may return to a heating unit again. In order to raise this flowing-back operation, a structure called Wick to a pipe inside is formed. therefore -- in order to avoid heat-conducting characteristic ability on Toward in a heat pipe -- (A) -- the heat-conducting characteristic ability of the inside and outside of a pipe, and (Ro) -- the performance and (C) which promote Q boil or condensation by a pipe inside -- it is required that Wick who raised the performance which transports a medium (especially fluid) to the longitudinal direction of a pipe should be formed. As improvement of this kind of heat exchanger tube, previously, these people proposed that of None, as Japanese Patent Application No. No. 252358 [ 60 to ] was shown in Drawing 8. cylindrical hollow 2 where a large number of this heat exchanger tube by which the opening was relatively narrowed by the inside of metal shells l are closed end -- it is a thing forming porous plating layer 3 which has .. account hollow 2 of a field -- while increasing the heat transfer area of the inside of shell l and improving the performance of the above-mentioned (b) by ..., the nuclear generation for cellular generating is urged, nucleate boiling is promoted, the performance of the above-mentioned (Ro) is raised, and improvement in heat transport capability is aimed at. "The problem which an invention tends to solve", and time set to the above heat exchanger tubes, the fluid condensed when this heat exchanger tube was used as a condensing part of a condenser tube or a heat pipe since the rate that hollow 2 adjoining comrades have been independent, respectively was high -- hollow 2 -- it was hard to be discharged, accumulated in .., and there was a problem that the transfer speed of a fluid was small. Then, by applying a masking agent to the shell inside before plating in the shape of a line, or carrying out form rolling of the slot to the inside of the shell after plating, the slot which follows the longitudinal direction of shell l is formed in above-mentioned porous plating layer 3, and transporting a fluid through this slot is also considered. However, since an inside diameter was as small as an Icm grade and also this kind of heat exchanger tube had about i several 10 cm~number length, for example, it had the problem that it is difficult to cover that full length and to apply a masking agent in the shape of a line, and processing cost cost remarkably dearly and it did not maintain profit as a product. Since the method of carrying out form rolling of the slot has a possibility that a part of plating layer may exfoliate, it is not desirable. It was made in order that the "means for solving problem" present invention might solve the above-mentioned problem, A plating layer is formed in the inside portion of the shell which inserts in the same axle the cylindrical masking device of non-conducting by which the opening was formed in the peripheral wall, and counters the inside of metal shells with the above-mentioned opening of this masking device. "EXAMPLE" Hereinafter, with reference to drawings, one example of the heat exchanger tube manufacturing method of the present invention is described in order of a process. Drawing 1 is a top view showing masking device IO used in this example. the inside diameter of the shell from which this masking device lO is a thing of a thin cylinder form which consists of the quality of the material (for example, resin, such as tetrafluoro ethylene) of non-conducting, and that outside diameter serves as a heat exchanger tube -- several -- a 100mu shoulder grade -- small -- full length -- a shell -- abbreviated -- it is supposed that it is equivalent. This masking device lO is covered all over that peripheral wall, and many small circular openings 11 (for example, 1Shoulder scrapphi) are formed in it for every (every [ for example, ] 3■) constant interval. and jig 13 arranged with a constant interval at insoluble anode wires 12, such as Made, in T i -P from which masking device 10 serves as the anode in the case of plating -- it is attached to the same axle via .. As shown in Drawing 2, many dipping holes 13A for letting plating liquid pass are formed in these jigs 13. Arbitrary shape may be sufficient as dipping hole 13A, for example, also as shown in Drawing 3, it is made. Next, what diluted hydrophobic substances, such as silicone oil, with volatile solvents, such as ethanol, is applied to the inside of the above-mentioned shell, a solvent is evaporated, and a hydrophobic thin film is formed. As for the thickness of this hydrophobic thin film, it is preferred that it is 0.1~5micro skin, in 0.1 micrometer or less, if generation of a hollow decreases and 5micro of another side shoulder is exceeded, insulation will become high too much and a uniform porous plating layer will no longer be obtained. Subsequently, above-mentioned masking device lO and anode wire 12 are inserted into the shell in which the hydrophobic thin film was formed, and where tension is applied to anode wire 12, it sets in a plating device as shown in Drawing 4. StorageW in which this device stores copper sulfate plating liquid! It comprises 14, chemical pump 15 which pressurizes plating liquid, filter 16, and ff1ffl 17 [ a total of ], Plating liquid is circulated through shell 18, adding and compensating basic copper carbonate with reduction of the copper ion by plating by this Storage 4014. A set is completed, and between f This et al., the above-mentioned anode wire 12, and shell 18, interrupted current, usual pulsed current, or pulsed current, such as Pn current, is used properly suitably, and is energized. Then, the water in plating liquid is electrolyzed, oxygen gas is emitted from anode wire 12, and a part of this oxygen gas adheres to the hydrophobic thin film formed in the inside of shell 18 which is the negative pole. and opening 11 of masking device 10 -- a deposited metal grows up to be an inside portion of shell 18 which counters ... in the form where the above-mentioned air bubbles are wrapped in, and the porous plating layer is gradually formed in it. the anodal current density at the time of plating -- 2OA/dm" -- it becomes it is required to be above and insufficient [ less than it ] emitting oxygen gas. If a plating layer reaches soon, predetermined thick fence, for example, 150micro hips grade, after removing shell 18 for energization from the above-mentioned plating device by stop +h L and also extracting masking device 10 and anode wire 12 from shell 18, a suitable solvent fully washes shell 18 and it obtains a heat exchanger tube. the island shape mutually estranged in the inside of the heat exchanger tube obtained in this way as shown in Drawings 5 and 6 -- porous plating layer I9 -- since .. is formed When this intermediary SL pipe is used as the condensing part and condenser tube of a heat pipe, it is plating layer 19... The fluid condensed on the surface should be efficiently transported to the portion which plating is not made through Done and here at the longitudinal direction of shell 18. carrying out -- f This -- case the eccritic nature of a fluid is good, transfer speed is large and there are many which can acquire high heat transport capability, and amounts of condensation of a fluid -- plating F319 -- since the area of the portion in which ... is not formed is relatively large, plating layer 19 ... cannot be easily buried in a fluid, and it can always expose on a fluid, and can maintain a good condensation facilitatory effect. Drawings 7 and 8 are what measured the performance of the heat exchanger tube manufactured by the above-mentioned method, and the conventional heat exchanger tube, The graph of the Heat transfer coefficient at the time of using Drawing 7 as a generating tube and Drawing 8 are graphs which show the Heat transfer coefficient at the time of using it as a condenser tube, and that from which numerals A were obtained by the method of Survey, the thing to which B carried out form rolling of the slot to the inside of the metal tube, and C show the performance of the mere metal tube. Sign in Drawing 6 does not have a flow liquid way in which the same porous plating layer as A was formed all over the metal tube. The heat exchanger tube obtained by the method of the present invention is superior to the conventional thing also in any of evaporation performance and condensation performance so that clearly from these graphs. According to the above heat exchanger tube manufacturing methods, it only plates by inserting masking device 10 into shell 18, Conventionally, since the flow liquid way in the difficult porous plating layer can be formed easily, the heat exchanger tube which was excellent in the heat-conducting characteristic can be manufactured in high production efficiency, and a manufacturing cost can be reduced. Since said is carried out and masking device 10 can be repeated and used any number of times, Manufacture cost reduction can be planned from this point. opening II circular in the account example of city i -- although ... was formed and "Nimas king member lO was used, the shape of an opening may be changed into Appointment if needed. for example, slit 20 prolonged in the direction of an axis as shown in Drawing 9 -- form .., or form the slit prolonged spirally, and To do be also possible and, in such a case, further improve the transfer speed of a fluid using the capillary tube power of the gap of the plating layers formed in the shape of a line. moreover -- the projection for positioning for keeping constant the crevice between the peripheral face of masking device 10 and the inner skin of shell 18 [ all the circumferences ] to the peripheral face of masking device 10 may be formed suitably -- then minute eccentric prevent of anode wire 12 at the time of plating -- things are made -- Plating layer 19 ... the homogeneity of thickness can be improved. porous plating layer [ like the account example of city ■ ] 19 whose plating layer formed in the inside of shell 18 is -- it is considered as the usual plating layer which is not porous, a tree-like plating layer, a granular plating layer, etc. ... and if needed -- it can thing do. As a method of forming a plating layer, it is [ method / unelectrolyzed plating ] feasible besides the above-mentioned electrolysis plating method. "EFFECT OF THE INVENTION" In the manufacturing method of the heat exchanger tube of the present invention, it only plates by inserting the masking device of non-conducting into metal shells, It is efficiency good (manufacturing at the cheap cost, deer, is possible.) about the heat exchanger tube with which heat-conducting characteristic ability was able to be immersed since flow liquid way formation in the difficult plating layer was performed easily conventionally.

[Brief Description of the Drawings]

The sectional view of a masking device and Drawing 4 of the top view and Drawings 2 and 3 of the masking device by which Drawing 1 is used for the heat exchanger tube manufacturing method of one example of the present invention which carried out the partial fracture are schematic diagrams of a plating device. The graph the top view showing the shape of interiority of the heat exchanger tube with which Drawings 5 and 6 were manufactured by the method, a sectional view, and Drawings 7 and 8 indicate the performance of the heat exchanger tube to be, the top view of the masking device by which Drawing 9 is used for the example of the pond of the present invention, and Drawing 10 are enlarged drawings of the section of the conventional heat exchanger tube. IO [ 13 / 15 / ... A porous plating layer, 20 / ... Opening of a masking device. / ... A chemical pump, 18 ... Metal shells, 19 / ... A jig, 14 ... Reservoir ] ... A masking device, 11 ... An opening, 12 .. Anode wire