JPH01118314A - Multiple bundled tube and its manufacture - Google Patents

Abstract

PURPOSE:To improve the quality of a multiple bundled tube and to enlarge its length by bundling many fine diameter tubes through filler, arranging them in an outer pipe and traveling annular heating and annular coating alternately on the outer part of the outer pipe. CONSTITUTION:Many fine tubes 2' having prescribed size each are bundled previously and filled with brazing filler metal 7 as filler. Then, the outer pipe 1' is put on these bundled tubes to form a raw pipe 3' and a high frequency induction device, etc., at an annular heating device 4 and an annular cooling device 5 are arranged at prescribed sites of the outer pipe 1' under this state. When the heating device 4 and the cooling device 5 are traveled relatively in the axial direction, the heated outer pipe 1' is plasticized as its front and rear are constrained by the cooling device 5, clamped and rolled by a bending moment. Hereby, the heating device 4 and the cooling device 5 are reciprocated all over the length of the outer pipe 1 to obtain a multiple bundled tube strongly clamped through brazing filler metal 7. Therefore, the multiple bundled tube is improved in the quality.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The disclosed technology belongs to the technical field of tubes in which a predetermined number of small-diameter tubes are densely installed inside an outer tube for use in heat exchange devices and the like.

Summary of the gist> The invention of this application is a multi-bundle in which a set number of small-diameter tube groups made of aluminum or the like are firmly connected to each other and are tied together within an outer tube. This invention relates to a tube and a method for manufacturing the same, and in particular, a group of small-diameter tubes is fixed to each other via a filler such as a brazing material, and is tightened to a large-diameter outer tube made of carbon steel or the like. This invention relates to a multi-bundle tube housed inside a multi-bundle tube and a manufacturing method in which the multi-bundle tube is tightly tightened within the outer tube by FA thermal diameter reduction method for the outer tube.

<Prior Art> As is well known, piping is used in all kinds of industries, not only for its primitive use in transporting fluids, but also recently for use as strength members such as beams of structures and equipment frames, as means of information transmission, and as a means of transmitting information. teeth,
It has also come to be used as a surrounding material.

Therefore, as piping has come to be used for these various uses and these combined uses, its structure is not limited to simple straight pipes, but also includes pipes in pipes, cross pipes, and double pipes. There is an increasing demand for complex structures such as those capable of controlling various functions.

For example, a double pipe in which a set number of small diameter pipes are tightly bundled in a heat exchanger, etc., or a double pipe made of a large number of small diameter pipes such as a cable surrounding pipe are bundled inside a protective pipe of an outer pipe. There is a strong demand for duplex pipes such as those in the outer pipe to be manufactured in a fully functional state. A double tube that holds tubes has not been developed so far, and there is a strong desire for its development.

<Problems to be Solved by the Invention> As shown in (a) above, these double pipes need to be tightly connected to each other in a large diameter outer pipe lined with reinforcing materials. Moreover, while each small-diameter tube functions independently, it must be ensured that there will be no mutual misalignment, leakage, or rust during operation over time, and of course during the manufacturing stage, The technology that satisfies the requirements during operation after manufacturing has not been developed, which has the drawback of putting a brake on potentially large demands.

<Object of the Invention> The object of the invention of this application is to provide a double pipe in which predetermined small-diameter pipes are tightly bundled in a pressure-resistant outer pipe based on the above-mentioned prior art, and , we have made the manufacturing problem a technical issue to be solved, and while maintaining the independence of the small diameter tubes from each other, they are securely tightened by the outer tube during manufacturing, and there is no mutual displacement or leakage during operation. To provide an excellent double pipe and its manufacturing method, which prevents rust and wear, and which can be formed into a long length of desired length, thereby benefiting piping technology applications in various industries. That is.

In order to solve the above-mentioned problems, the structure of the invention of this application, which is based on the above-mentioned claims, is to solve the above-mentioned problems. The small-diameter tubes are bundled into a circular cross-section through a filler such as a brazing material, and then layered relatively inside an outer tube made of carbon steel, etc. In addition to setting an annular heating device such as a high-frequency induction heating device, an annular cooling device such as a water showering device is set at the front and rear of the annular heating device, and both annular heating devices and annular cooling device are connected to the axis of the outer tube. The outer tube attempts to expand in diameter by annular heating by relative movement along the direction at a predetermined speed.
At least one part of the tube is restrained by annular cooling and is prevented from expanding in diameter, and by annular heating, it undergoes plastic deformation through a decrease in strength, yields, and is inwardly contracted and tightened, forming each small diameter tube. Each small diameter pipe relative to the outer pipe in a tightened state and in operation, and
This prevents each small diameter tube from interacting with each other, preventing leakage and rust, and also prevents filler materials such as brazing filler metal from melting due to annular heating and then condensing due to annular cooling. The diameter pipes are tightly fixed to each other to ensure good heat conduction.
Technical measures have been taken to allow a fluid at a predetermined temperature to flow through each small-diameter tube, or to allow a cable or lead wire to be inserted therethrough, so that the tube can perform a desired function.

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

First, the aspect of the basic embodiment is shown with reference to the drawings from FIG. 3, and as shown in FIG. 6, an annular heating device 4 such as a high-frequency induction heating device is set at a predetermined portion of the outer tube material 1, and an annular cooling device 5 such as a shower ring using water passing is installed before and after the annular heating device 4.
．． 5 and move it relative to the base tube 3 in the direction of the arrow at a predetermined speed as shown in FIG. If the outer tube material 1 has a free end, it will try to expand outward in diameter, but the expansion is prevented because it is restrained by the front and rear annular cooling devices 5.5, and the strength decreases due to the annular heating. As shown in Fig. 8, the presser bending moment F due to annular cooling acts on the outer tube material 1, causing it to finally yield, and the outer tube material 1 is pressed against the inner tube material 2, causing the inner tube material 2 to tighten and contract in diameter, and the tightened state is achieved. will be revealed.

Since the annular heating device 4 and the annular cooling device 5.5 move relative to each other in the axial direction of the outer tube material 1, as a result, the entire area of the blank tube 3 is tightened, and the tightened state is achieved. is obtained.

In this way, the ligated tube 6 is obtained as shown in FIG.

An example according to the aspect of the above-mentioned principle example is shown in FIGS. 1 to 4. For example, a plurality of small diameter tubes 2', 2', etc. made of aluminum with a predetermined small diameter are bundled together in a set number. As shown in FIG. 3, a filler metal 7 is filled between these parts in a dense state and bundled next to each other, so that they are relatively layered in an outer tube 1' made of carbon steel. to form a blank pipe 3',
In this state, as shown in FIG. 2, an annular heating device 4 such as a high-frequency induction heating device is set at a predetermined portion of the outer tube 1', and an annular cooling device 5 is installed before and after the annular heating device 4, such as a shower ring of water. 5 is set and moved integrally relative to the outer tube 1' in the axial direction at a predetermined speed, the outer tube 1', whose strength has been reduced by the annular heating, will expand in diameter due to the heating, as in the above-mentioned principle embodiment. However, due to the annular cooling, it is restrained at the front and rear parts and plastically deforms, and due to the presser bending moment, it finally yields and contracts in diameter, and it envelopingly hits the outer surfaces of the small diameter tubes 2', 2'... They touch each other and become a kind of tightening state.

Therefore, an annular heating device 4 and an annular cooling device 5.
By reciprocating the outer tube 1' from the starting end to the terminal end of the outer tube 1', the outer tube 1' is tightened in the opposite direction to the small diameter tube group 2', 2', and during this period, the outer tube 1 is tightened by annular heating. The brazing filler metal 7 interposed between the small-diameter tubes 2', 2', which are in envelope contact with the tubes 2' and 2', is melted and condensed by annular cooling, and the small-diameter tubes 2', 2'... 1', and each small diameter tube 2' is also firmly fixed to each other.
This tightening due to the dignified diameter reduction of the outer tube 1' and the fixation due to solidification of the brazing filler metal 7 combine to form the outer tube 1' and the small diameter tube 2'.
, 2', and the respective wire diameter pipes 2', 2'...The mutual bonding state is extremely strong, and due to thermal behavior during operation, etc., the small diameter pipes 2', 2' and the outside No relative displacement occurs with respect to the pipe 1', and no clearance is created between the pipe 1' and the brazing filler metal 7, thereby suppressing the occurrence of rust and leakage.

The double tube 8 thus obtained has the outer tube 1' and each of the small diameter tubes 2', 2', . Even when heat exchange is performed by flowing high temperature liquid a and low temperature liquid S through each small diameter tube 2', no thermal behavior or deviation occurs, the tightly fixed state is reliably maintained, and no solidification occurs. Since it is in close contact with the brazing filler metal 7, heat conduction is good and heat exchange is achieved as designed.

In addition, even if wires, lead wires, and cables are inserted through each small diameter pipe 2' to transmit information after manufacturing the double tube, these wires, cables, etc. may break due to thermal behavior over time. It does not suffer from damage due to bending or causes problems such as rust, and can always be maintained to perform its functions to its fullest.

Of course, the double tube allows heat exchange with the fluid outside the outer tube 1'.

Incidentally, it goes without saying that the actual embodiment of the invention of this application is not limited to the above-mentioned embodiment, and for example, a dedicated embodiment in which the inner tube can be inserted and set inside the rear mold tube group can be adopted. be.

In addition, it is of course possible to change the design by twisting the group of small-diameter tubes into a spiral shape, and by using not only round tubes but also rectangular tubes for each small-diameter tube.

Applications include not only double pipes for fluid flow applications, but also protection pipes for information transmission through which cables are inserted, strength members of structures and equipment, and heating pipes for boilers. It is also possible to do things.

<Effects of the Invention> As described above, according to the invention of this application, in a double pipe used for a heat exchange device etc., in which a set number of small diameter pipes are provided inside,
The small-diameter tubes set inside the outer tube are tightly connected by the outer tube, and a filler such as a brazing material is not applied to the outer tube and between each of the small-diameter tubes. Because they are interposed and tightly set, each small diameter tube can maintain an extremely firmly fixed state not only to each other but also to the outer tube as it was at the time of initial manufacture. During operation over time, there is no relative positional shift or gap caused by vibrations caused by external disturbance conditions, or even by thermal behavior, etc. Therefore, no misalignment or wear occurs, and the initial function is fully demonstrated. Qin has the excellent effect of being able to do things.

In addition, not only is it firmly fixed mechanically, but it is also tightly fixed through fillers such as brazing filler metal, so it has good heat conduction.
Therefore, extremely efficient heat conduction can be performed in heat exchange, etc., and since the overall heat system can be maintained as one for strength members and packaging materials, an excellent effect is achieved in that thermal behavior does not occur. .

In addition, since the double-layered tube allows a set number of small-diameter tubes to be set in one outer tube, when manufacturing the double-walled tube, each Tato tube and the small-diameter tube are formed by a sequential feeding operation. The excellent effect of being able to form a double-walled pipe in a desired elongated state is achieved.

[Brief explanation of the drawing]

1 to 4 are detailed explanatory diagrams of the invention of this application, in which FIG. 1 is a 70-cut perspective view of a double pipe, FIG. 2 is a vertical cross-sectional view during manufacture, and FIG. FIG. 4 is a perspective view of the fluid flow during operation, and FIGS. 5 to 8 are perspective views, partially cut away, of the basic embodiment. 2'...Small diameter tube, 1'...Outer tube, 8...
Double pipe, 7...filling material

Claims (2)

[Claims] (1) In a multi-bundle tube in which a large number of small-diameter tubes are firmly connected to each other and the whole is connected by an outer tube, a filler is interposed between the outer tube and each small-diameter tube to fix them. A multi-bundle pipe characterized in that the outer pipe is in a tightened state. (2) In a method for manufacturing a multi-bundle tube in which a large number of small-diameter tubes are fixedly connected to each other and the whole is connected by an outer tube, a predetermined number of small-diameter tubes are bundled via a filler, and these small-diameter tubes are bundled together through a filler. The tube bundle is layered relative to the outer tube, and then annular heating is applied to the outer tube, annular cooling is applied at least before and after the annular heating, and these annular heating and annular cooling are moved relative to the outer tube to form the outer tube. A method for manufacturing a multi-bundle tube, characterized in that the tubes are tied together into a small-diameter tube bundle.