JPH01118310A - Triplicate pipe of conductors and its manufacture - Google Patents

Abstract

PURPOSE:To continuously form a long-sized triplicate pipe of conductors by bonding a plurality of conductors between an inner pipe and an outer pipe through filler in an annular arrangement. CONSTITUTION:A plurality of conductors 6 having a prescribed fine diameter each are fixed tightly in a close state to each other and in an annular arrangement on the outer surface of the inner pipe 2 through brazing filler metal 7. The outer pipe 1 is put on the conductors and an annular heating device 4 such as a high frequency inductance heating device, etc., is set at a prescribed site of the outer pipe 1 and before and behind it or behind it at least are set annular cooling devices 5, 5 to perform showering. The annular heating device 4 and the annular cooling devices 5, 5 are moved relatively in the axial direction of the outer pipe 1, the brazing filler metal 7 is melted by the annular heating device 4, the diameter of the outer pipe 1 is expanded to the outer direction, the annular cooling before and behind the expanded part constrains the expansion of the diameter, the diameter is contracted to the inner pipe 1 through the conductors 6 and the inner pipe 2 is bonded tightly with the conductors 6. The brazing filler metal 7 is solidified by annular cooling, the conductors 6 are fixed to the inner pipe 2 and the outer pipe 1 to form a triplicate pipe of conductors 8.

Description

[Detailed Description of the Invention] <Industrial Application Field> The disclosed technology is a method for forming a dense ring with a plurality of small-diameter third conduits between a large-diameter outer tube and an inner tube, such as those used in a heat exchanger. It belongs to the technical field of double-way triple-layer pipes interposed in a similar arrangement.

<Summary of the gist> The invention of this application has a set number of small-diameter conduits arranged closely together in a ring shape between an outer tube made of carbon steel or the like and an inner tube made of stainless steel or the like. This invention relates to a double-way triplex pipe interposed in an array and a method for manufacturing the triplex pipe, and in particular, a third narrow-diameter conduit is inserted between the inner pipe and the outer pipe via a filler such as a brazing material. The present invention relates to a double-path triple-layer pipe used for heat exchange, etc., in which the outer pipe is attached and fixed in a straight pipe or in a spiral shape, and the outer pipe is tightly connected, and a method for manufacturing the double-path triple-layer pipe.

<Prior art> As is well known, piping is used in many fields and in various forms, and is not only used primarily for fluid transportation, but also recently as a strength material such as beam materials for structures and equipment. Furthermore, they have come to be used as information transmission means or as surrounding materials.

Moreover, these pipes are often required to perform multiple functions at the same time, and therefore, instead of just single-walled pipes, double-walled pipes and double-walled pipes with a return path, such as double pipes and triplex pipes, are also required. Therefore, piping structures have changed from simple shapes to complex shapes, and technologies have been developed to meet these demands.

In particular, with the recent development of heavy and chemical industries and the improvement of citizens' lives,
Due to the spread of heat exchangers and the rise of nuclear power plants, complex pipe shapes such as central pipes, bent pipes, branch pipes, and double pipes are becoming required, and these needs are being met. There is a strong demand for the development of pipes and their manufacturing technology that can meet these demands.

Moreover, due to the facilities involved, long pipes, meandering pipes, etc., which are not short pipes but have extremely long actual lengths, have not been fully satisfied until now.

<Object of the Invention> The object of the invention of this application is to enable a long straight pipe, spiral pipe, etc. to be closely interposed between the inner pipe and the outer pipe based on the above-mentioned prior art, and to reduce the length of the meandering pipe. It is an object of the present invention to provide an excellent double-way triple-layer pipe and a method for manufacturing the same, which are capable of forming long pipes and are capable of heat exchange and local heating and cooling, thereby benefiting the field of piping technology application in various industries. It is something.

<Means/effects for solving the problem> In accordance with the above-mentioned object, the structure of the invention of this application, which is summarized in the scope of the above-mentioned patent claims, is to solve the above-mentioned problem by using a double-way triple-layer pipe as a pipe-in-pipe. For example, a predetermined number of conduits of a predetermined small diameter made of aluminum or the like are attached to the outer surface of an inner tube made of stainless steel through a filler such as a brazing material in a ring-like arrangement in a dense manner. A ring-shaped heating device such as a high-frequency induction heating device is set at a predetermined portion of the outer tube by layering an outer tube made of carbon steel or the like, and water is passed through at least the rear part of the outer tube. Set up an annular cooling device that performs showering, etc., and move these annular heating devices and the annular cooling device relative to each other in the axial direction of the outer tube. The strength of the tube is reduced and the diameter expands outward, and the expansion diameter is cooled by annular cooling before and after, restraining the expansion diameter and plastically deforming, and finally yielding and reducing the diameter of the inner tube through the conduit. The manufacturing process should be continuous, with the conduit being fixed to the inner and outer pipes by solidifying the filler material such as brazing material by annular cooling. Therefore, it is possible to manufacture long double-way triple-layer pipes, and it is possible to perform predetermined functions such as heat exchange, local heating, and local cooling, and in this way, from the inner pipe to This is a technical measure that enables highly efficient heat and cold conduction to the conduit and from the conduit to the outer tube.

<Embodiments - Configuration> Next, embodiments of the invention of this application will be described below with reference to the drawings.

In the principle embodiment shown in FIG. 4 and below, an inner tube material 2 is layered relative to an outer tube material 1 to form a double-layer pipe material 3 as shown in FIG. A heating device 4 such as a high-frequency induction heating device is set in a ring shape at a predetermined portion of 1, and a cooling device 5.5 such as a tap water showering device is also set in a ring shape before and after the axial direction. Make it move relatively in the axial direction.

As a result, the outer tube material 1 attempts to expand in diameter at the heated portion by the annular heating device 4, and if both the front and rear ends are free ends, the outer tube material 1 expands in diameter, but due to the cooling action of the front and rear annular cooling devices 5.5, the outer tube material 1 expands in diameter. As shown in FIG. 7, the presser bending moment F acts and restrains the outer tube material 1 in the heated portion, thereby reducing the strength of the outer tube material 1 due to heating. The outer tube material 1 is plastically deformed through lowering and finally yields, and the outer tube material 1 contacts the inner tube material 2 and is tightened to reduce its diameter.By relatively moving the annular heating device 4 and the annular cooling device 5.5 in the axial direction As a result, the tied tube 6 is formed in the entire region of the raw tube 3 as shown in FIG.

Such a diameter reduction phenomenon occurs regardless of the wall thickness, size, material, etc. of the outer tube material 1 relative to the inner tube 2, and also if there is any other member between the inner tube material 2 and the outer tube material 1, such as a conduit, etc. Even if an intermediate tube is inserted, the operation can be carried out without any problem, and the heating and cooling of the interstitial tube can be performed at the same time.

Next, an embodiment according to the above-mentioned principle embodiment will be explained with reference to FIGS. 1 to 3. The illustrated embodiment is an embodiment of a triple tube 8 used in a heat exchange device of a nuclear power plant, etc., and an inner tube 2 made of stainless steel. A copper conduit 6.6 of a predetermined small diameter is inserted through a filler material 7 applied in advance to the outer surface of the .
The outer tubes 1 made of carbon steel or the like are stacked on each other in a predetermined manner.

In addition, in this embodiment, since the triple pipe 8 is a long pipe, the above-mentioned inner pipe 2, each conduit 6, and the outer pipe 1 are appropriately and continuously layered to form a predetermined long pipe. do it like this.

An annular heating device 4 such as a high-frequency induction heating device is set at a predetermined portion of the outer tube 1 in the same manner as in the above-mentioned principle embodiment, and an annular cooling device 5.5 such as a shower ring using tap water is installed before and after the annular heating device 4. are similarly set integrally and linked to a predetermined axial relative movement device.

Then, the inner pipe 2 and each conduit 6 are continuously formed.
, and an annular heating device 4 for the triple tube main tube 3' of the outer tube 1.
, and when the annular cooling device 5.5 is moved relative to each other in the axial direction, the brazing material 7 at each part is
melts.

In this way, the plastically deforming outer tube 1 finally yields, and as shown in FIG. The melted brazing filler metal 7 causes each conduit 6 to wrap around the inner tube 2 and outer tube 1, and the melted brazing filler metal 7 is heated by the cooling action of the annular cooling device 5.5. condenses and firmly fixes each conduit 6 to the inner tube 2 and outer tube 1, and this, together with tightening due to diameter reduction of the outer tube 1, causes the conduits 6 of the outer tube 1, the inner tube 2, and the intermediate tube to .6... will bring all three parties into a state of tightness, and a mutual fixed relationship will definitely emerge.

Since the inner tube 2, the outer tube 1, and each conduit 6 are continuously drawn out and molded, the desired double-path triple-layer tube 8 is formed.

In this way, the double-way triple-layer pipe 8 obtained in a long piece with a predetermined length
When high-temperature fluid is caused to flow through the inner tube 2 and low-temperature fluid to be heated is caused to flow through each conduit 6, the inner tube 2
and the conduits 6, 6, . . . are in close contact with each other by the brazing material 7, so that good heat conduction is achieved and a predetermined heat exchange is performed.

In this case, the conduit 6.6 attached to the outer surface of the inner tube 2
... is designed into a predetermined meandering pipe, local heating and local cooling are also possible.

In addition, by flowing a high-temperature fluid through the inner tube 2 and flowing a higher-temperature fluid through each conduit 6, heat can be efficiently conducted to the outside of the outer tube 1, resulting in high-temperature heat exchange. will be held.

It goes without saying that the embodiments of the invention of this application are not limited to the above-mentioned embodiments. As for the small-diameter conduit interposed between the outer tube and the outer tube, it is possible to adopt a spiral shape or a rectangular pipe shape.

Furthermore, it goes without saying that various design changes are possible, such as using an industrial adhesive such as a sealant instead of a brazing filler metal.

It goes without saying that the present invention can also be applied to piping other than heat exchangers, such as cable conduits.

<Effects of the Invention> As described above, according to the invention of this application, a third conduit with a small diameter is basically provided between the inner pipe and the outer pipe in a double-way triple pipe used for a heat exchange device of a nuclear power plant, etc. Effects such as being able to perform heat exchange by allowing a predetermined thermal fluid to flow through it by interposing it are obtained.

Since each conduit can be attached to the outside of the inner tube, it is easy to attach the conduit during manufacturing, and furthermore, the outer tube can be layered relatively to the outside of the inner tube. There is an advantage.

In order to reduce the diameter of the outer tube layered on the outside of each conduit attached to the inner tube by using the deep diameter reduction method, the expansion diameter due to the annular heating is equal to the diameter of the rear tube. Because it is possible to constrain the expansion diameter by annular cooling, plastically deform it, yield, reduce the diameter, and enter a tight state, even in the initial relatively layered state, the outer tube is connected to the inner tube through the conduit. This provides an excellent effect in that it can be brought into a tight state.

Therefore, even if a filler material such as a brazing material is interposed between the inner tube and the conduit or between the conduit and the outer tube in advance, the brazing material etc. will melt due to the annular heating due to the gentle diameter reduction, and the conduit and the inner tube will ,as well as,
The conduit and the outer tube, and therefore the inner tube and the outer tube, are not only firmly connected at the end of production, but also appear in a close contact state, which not only has extremely high heat conduction efficiency, but also prevents phenomena such as peeling. The excellent effect is that rust and corrosion do not occur between the inner tube and the conduit, and between the conduit and the outer tube.

In addition, even if the filler interposed between the inner tube and the conduit, and between the conduit and the outer tube expands due to heat conduction during operation, the initial tight state is maintained, so peeling phenomena may occur. Not born,
Another advantage is that the initial design functions do not change over time and can always be fully utilized.

Therefore, the conduit interposed between the inner pipe and the outer pipe is simply the second pipe,
It can be used not only for passing a third fluid, but also as a cable or information transmission pipe, and since the interposed state is maintained as originally, these functions will not change over time. It also has the effect of being able to be maintained without change.

In addition, since the conduit tube and the outer tube only need to be layered relative to each other in the initial process, they can be continuously fed out, and therefore, there is a degree of freedom in design that allows the production of long double-way triple-layer tubes of desired length. There are also secondary benefits that can be raised.

[Brief explanation of the drawing]

1 to 3 are explanatory diagrams of one embodiment of the invention of this application, in which FIG. 1 is a partially cutaway perspective view when relatively stacked, FIG. 2 is a partial vertical sectional view when tightened, and FIG. The same cross-sectional view, FIG. 4 and the following are partial cross-sectional perspective views of the principle embodiment of the invention of this application, FIG. 4 is a partial cross-sectional view in the case of relative overlapping, and FIG. FIG. 6 is a partially cutaway perspective view of the fastened double pipe, and FIG. 7 is a perspective view when a presser bending moment is applied.

Claims (2)

[Claims] (1) In a double-way triple pipe in which another conduit is interposed between the outer tube and the inner tube, a plurality of conduits are connected in a ring-like arrangement between the inner tube and the outer tube via a filler. A double-way, triple-layer pipe characterized by being interposed with (2) In a method for manufacturing a double-way triplex pipe in which another conduit is interposed between the outer pipe and the inner pipe, a plurality of conduits are attached to the outside of the inner pipe in a ring-like arrangement via a filler. Then, an outer tube is relatively stacked on the outside of the plurality of conduits, and annular heating is applied to the outside of the outer tube, annular cooling is applied at least before and after the annular heating, and the annular heating and annular cooling are moved in the axial direction. A method for manufacturing a double-way triple-layer pipe, characterized in that the diameter is reduced by