JP2904700B2 - Tube mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for mounting a tube using impact energy due to electric discharge.

[0002]

2. Description of the Related Art Conventionally, an operation of attaching a tube (for example, a heat transfer tube used for a heat exchanger or the like) to a structure is performed by an expander. In this method, a part of the tubular body is expanded by pressing a ring of the expander against the inner surface of the tubular body, and is mounted so as to be pressed against a mounting hole of a structure.

[0003]

In the method using the expander as described above, the ring is pressed against the inner surface of the tube, so that the diameter can be surely expanded. Must rely on the experience of the person, and therefore the work requires skill. In addition, the work requires a lot of work time since the pipes are attached one by one.

Accordingly, the present invention provides a pipe capable of solving the above problems.
It is intended to provide a body attachment device .

[0005]

Means for solving the problem of the present invention is to provide a container mounted on a portion to be expanded of a tubular body.
An insulating liquid is sealed, and the insulating liquid contains fine metal wires and gold.
A pair of electrodes, one end of which is connected to each other via
The electrode is immersed and the other end of the electrode is connected to a capacitor
The container is charged with the electric energy stored in the condenser.
Melts and evaporates by supplying lug to the metal wire
Along the inner surface of the tube with the impact of
It is an elastic body.

[0006] In addition, a container to be attached to the expanded portion of the tubular body is
An insulating liquid is sealed, and the insulating liquid contains fine metal wires and gold.
A pair of electrodes, one end of which is connected to each other via
The pole is immersed and the thin metal wire is arranged in the tube axis direction of the tube.
The other end of the electrode is connected to a capacitor .

[0007]

[0008]

In the above-mentioned means for solving the above problems, the electric energy charged and accumulated in the capacitor is discharged and supplied to the thin metal wire immersed in the insulating liquid sealed in the container mounted on the enlarged diameter portion of the tube in a short time. By rapidly melting and evaporating the thin metal wire, expanding the diameter of the tube by the impact force, and pressing the expanded portion of the tube against the mounting hole of the structure, the operation does not require skill, Further, the work time can be reduced.

[0009] Further, the pressure inside the container body may be abnormally increased by making the container containing the thin metal wires an elastic body which extends along the inner surface of the tube in response to the impact when the thin metal wires melt and evaporate. The height is prevented, and the electrode is not blown off at the time of diameter expansion and is safe.

Further, by arranging the thin metal wires in the tube axis direction in the container, the impact force of melting and evaporating the thin metal wires is evenly transmitted to the expanded portion of the pipe, and the expanded portion is expanded. The diameter is evenly expanded.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, a mounting device A according to a first embodiment of the present invention includes a mounting hole 1 formed in a structure 1.
The diameter of the expanded portion 2a of the tube 2 (for example, a heat transfer tube used for a heat exchanger, etc.) to be attached to the tube a is increased and the tube 2 is attached to the structure 1.

As shown in FIG. 3 and FIG. 3, a container 3 (for example, made of synthetic rubber) having a viscoelasticity, which is inserted and mounted on the enlarged diameter portion 2a of the tube 2, is provided.
Is composed of a cylindrical container body 4 and a lid 6 for enclosing water 5 (an example of an insulating liquid) in the container body 4.

The body of the container body 4 is an insertion portion into the enlarged diameter portion 2a of the tube 2, and the distal end portion is curved to expand the enlarged diameter portion 2a.
The lid 6 extends when the diameter of the structure 1 is increased.
An annular body 6a having a size substantially equal to the size of the mounting hole 1a and attached to the opening edge of the container body 4 by bonding.
And a disk 6b screwed into the central thread of the annular body 6a.

A pair of electrodes 7, 7 having the same length penetrate into the disc body 6b in the tube axis direction B, and the penetrating tips of the electrodes 7, 7 are connected to thin metal wires 8 (Cu, Al, W, etc.). ), The tips of the electrodes 7, 7 and the fine metal wires 8 are immersed in the water 5.

A plurality of annular grooves 1b are formed on the peripheral surface of the mounting hole 1a at a predetermined distance. The other ends of the electrodes 7, 7 are electrically connected to a capacitor C, a power source V is connected to the capacitor C, and the capacitor C is connected between the one of the electrodes 7, 7 and the capacitor C. A supply switch S for supplying the charged and stored electric energy to the thin metal wire 8 is connected.

Next, using the above tube attaching device A,
A method of attaching the pipe 2 to the structure 1 will be described. As shown in FIGS. 1 and 2, the pipe 2 is attached to the mounting hole 1 a of the structure 1.
Then, the container body 4 is inserted and mounted on the enlarged diameter portion 2a of the tubular body 2, and electric energy is stored in the capacitor C by the voltage applied from the power supply V. Then, the electric energy stored in the capacitor C is set to a predetermined value and the supply switch S
Is turned on, and the electric energy stored in the capacitor C is discharged and supplied to the thin metal wire 8 in a short time.

Then, the thin metal wire 8 is rapidly melted and evaporated, and the water 5 is vaporized. The impact force expands the container body 4 and expands the diameter-expanded portion 2a of the tubular body 2;
As shown in FIG. 2, the enlarged-diameter portion 2a of the tube 2 presses against the mounting hole 1a of the structure 1, and a part of the enlarged-diameter portion 2a presses into the annular groove 1b. It is fixed to the object 1.

When the diameter of the expanded portion 2a of the tube 2 is expanded, that is, when the water 5 is vaporized when the thin metal wire 8 is melted and evaporated, the extending portion of the container body 4 is subjected to an impact force. Tube 2
Elastically extend along the inner surface of the This prevents the pressure inside the container body 4 from becoming abnormally high, and is safe because the electrodes 7, 7 and the lid 6 are not blown off when the diameter is expanded.

The length of the enlarged diameter portion 2a is equal to the length of the mounting hole 1a.
So that it is almost equal to the depth of For this reason, the voltage of the power source V and the capacitor C accumulate so that the same impact force acts at a predetermined radial position (the position shown by the one-dot chain line in FIG. 1) around the discharge point (the center position of the thin metal wire 8). To adjust the electrical energy.

As described above, the electric energy charged and stored in the capacitor is discharged and supplied to the thin metal wire immersed in the insulating liquid sealed in the container in a short time, so that the thin metal wire is melted and evaporated and the impact force is applied. Since the diameter of the pipe is expanded and the expanded portion of the pipe is pressed against the mounting hole of the structure, the work of mounting the pipe to the structure does not require skill, and the worker can mount the pipe one by one. The working time for mounting can be greatly reduced as compared with the case of FIG.

If a plurality of pipes are simultaneously expanded and mounted, the work time for mounting can be further reduced. In the above embodiment, the two electrodes 7, 7 are formed to have the same length, and the thin metal wires 8 are connected to the ends thereof. For example, as shown in FIGS. 4 and 5, the electrodes 7, 7 have different lengths. And the tip of one long electrode 7 is L
And the other short electrode 7 is inserted and mounted shallowly in the tube axis direction B inside the container body 4, and is inserted between the two electrodes 7, 7. May be made substantially equal to the length of the mounting hole 1a, and the thin metal wire 8 may be wound around the tip of each of the electrodes 7, 7 in the tube axis direction B.

Also in this configuration, by supplying electric energy from the condenser to the thin metal wire 8 as in the above-described embodiment, the thin metal wire 8 is rapidly melted and evaporated, and the water 5 is vaporized. 4 is enlarged, the diameter-increased portion 2a of the tube 2 is expanded, and the tube 2 can be mounted in the mounting hole 1a of the structure 1.

In this case, since the thin metal wire 8 is arranged in the tube axis direction B and has a length substantially equal to the length of the mounting hole 1a, the impact force is substantially applied to the enlarged diameter portion 2a of the tube 2. The diameter of the expanded portion 2a can be evenly expanded.

In the first embodiment, the size of the lid 6 is formed to be substantially equal to the size of the mounting hole 1a of the structure 1. However, the size is not limited to this, and as shown in FIG. Even if the lid 6 is formed to be larger than the mounting hole 1a and the opening edge of the container body 4 is mounted, the same operation and effect as in the first embodiment can be obtained.

Further, in the first embodiment, the length of the body of the container body 4 is formed to be equal to the length of the mounting hole 1a of the structure 1. However, the present invention is not limited to this.
May be formed to be longer than the mounting hole 1a of the structure 1.

In this case, when the expanded portion 2a is expanded, the impact force reaches the expanded portion 2a before reaching the extending portion of the container body 4, so that the generated impact force is directly applied to the expanded portion 2a. Can tell.

Next, a second embodiment of the present invention will be described with reference to FIGS. The mounting device A according to the second embodiment of the present invention includes a container 11 mounted on the enlarged diameter portion 10a of the tubular body 10.
The electrode 12 on one side of the disk, the electrode 14 on the other side of the disk disposed opposite to the electrode 12 on the one side via an insulating support rod 13, and the electrode 12 on the one side And a container body 15 (for example, made of viscoelastic synthetic rubber) arranged between the electrode 14 on the other side.

Both ends of the container body 15 are attached to the outer peripheral surfaces of the electrodes 12 and 14 by annular stoppers 16. The distance between the electrodes 12 and 14 is set substantially equal to the length of the mounting hole 17a of the structure 17 to which the tube 10 is mounted.

An injection tube 19 for injecting water 18 into the container 11 penetrates through the plate surface of the electrode 14 on the other side,
Water 18 is sealed inside the container 11 by the injection pipe 19.

The immersion surface 12a inside the one side electrode 12
An electrode extension 20 is formed toward the electrode 14 on the other side, and the electrode extension 20 is inserted through an insulating material 22 into an insertion hole 21 formed in the immersion surface 14a inside the electrode 14 on the other side. The electrode 14 on the other side is formed with an electrode projection 23 projecting in the opposite direction to the immersion surface 14a, that is, in the same direction as the electrode extension 20 of the electrode 12 on the one side.

A thin metal wire 24 is soldered 25 with both immersion surfaces 12a, 14a of the electrode 12 on one side and the electrode 14 on the other side as mounting surfaces. The other configuration is the same as that of the first embodiment, and a description thereof will be omitted.

Next, the mounting method in the second embodiment of the present invention will be described.
a, the container 11 is inserted from the electrode 12 on one side to the electrode 14 on the other side in the enlarged diameter portion 10 a of the tube 10, and electric energy is stored in the capacitor C by a voltage applied from the power supply V. Then, the electric energy stored in the capacitor C is set to a predetermined value, the supply switch S is turned on,
The electric energy stored in the capacitor C is discharged and supplied to the thin metal wires 8 in a short time.

By doing so, the fine metal wires 24 are formed.
Is rapidly melted and evaporated, and the water 18 is vaporized. The impact force expands the container body 15 and expands the diameter-enlarged portion 10a of the tube body 10, as shown in FIG.
The portion 10a to be expanded can be pressed against the mounting hole 17a of the structure 17 to fix the tubular body 10.

Also in the second embodiment of the present invention, the metal wire 24 is provided in the tube axis direction B, and the metal wire 24 has a length substantially equal to the length of the mounting hole 17a. It is transmitted almost evenly to the enlarged diameter portion 10a of the body 10,
Therefore, the diameter-expanded portion 2a can be uniformly expanded.

According to an experiment on the mounting device shown in the second embodiment of the present invention, the diameter of the container body 15 is set to 20 m.
m, the diameter of the thin metal wire 24 is 0.14 mm, and the power supply voltage is 10
The impact force when the electric energy stored in the condenser C was set to 500 μF at 00 V was about 5000 atm on the inner surface of the container body 15.

In the second embodiment of the present invention, similarly to the first embodiment, the power supply voltage and the capacitor C
The length of the enlarged diameter portion 10a can be adjusted by adjusting the electric energy stored in the section.

The other operation and effects are the same as those of the first embodiment, and therefore will not be described.

[0039]

As is apparent from the above description, according to the present invention , the insulating liquid is sealed in the container to be mounted on the expanded portion of the tubular body.
The insulating liquid through the fine metal wire and the fine metal wire.
A pair of electrodes whose ends are connected to each other are immersed,
The other end of the pole is connected to a condenser and the container is
The electrical energy charged and stored in the denser is supplied to the thin metal wire.
Of the pipe due to the impact of melt-evaporation
An elastic body that extends along the inner surface
Electrical energy from a condenser to a thin wire in a short time
Discharge supply rapidly melts thin metal wires
The impact force at that time causes the pipe to expand in diameter, and the pipe is removed from the structure.
Skill is required for pipe mounting work because it is pressed against the mounting hole.
And multiple tubes are simultaneously attached to the structure.
The pipes can be attached one by one,
Work time for installation compared to installation on structures
Can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a tube mounting device according to an embodiment of the present invention before a diameter-expanded portion is expanded.

FIG. 2 is a cross-sectional view after the diameter-expanded portion is expanded.

FIG. 3 is an overall configuration diagram of a tube attaching device.

FIG. 4 is a cross-sectional view of a tube mounting device according to another embodiment before the diameter of the expanded portion is increased.

FIG. 5 is a cross-sectional view after the diameter-expanded portion is expanded.

FIG. 6 is a cross-sectional view of a tube mounting apparatus according to another embodiment before a diameter-expanded portion is expanded.

FIG. 7 is an overall configuration diagram of a tube attaching device according to a second embodiment of the present invention.

FIG. 8 is a sectional view showing a state before the diameter-expanded portion is expanded.

FIG. 9 is a cross-sectional view after the diameter-expanded portion is expanded.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Structure 2 Tubular body 2a Expanded part 3 Container 4 Container main body 5 Water 6 Lid 7 Electrode 8 Thin metal wire 10 Tubular 10a Expanded part 11 Container 12 One side electrode 14 Other electrode 15 Container body 17 Structure Object A Tube mounting device B Tube axial direction C Condenser V Power supply

Continuation of the front page (72) Inventor Akashi Chiragi 5-28 Nishikujo, Konohana-ku, Osaka-shi, Osaka Inside Hitachi Zosen Corporation (56) References Jiko 3-252 (JP, Y2) (58) Field surveyed (Int.Cl. ⁶ , DB name) B21D 39/08 B21D 26/12

Claims (2)

(57) [Claims] 1. A mounting device for expanding a diameter-expanded portion of a tubular body to attach the tubular body to a mounting hole formed in a structure ,
An insulating liquid is sealed in a container to be attached to the expanded portion of the tube.
The insulating liquid through the thin metal wire and the thin metal wire.
A pair of electrodes whose ends are connected to each other are immersed,
The other end of the electrode is connected to a condenser, and the container is
The electrical energy charged and stored in the capacitor
With the impact of melting and evaporating by supplying to the wire
And an elastic body extending along the inner surface of the tube.
A tube mounting device characterized by the following. 2. A mounting device for expanding a diameter-expanded portion of a tubular body to attach the tubular body to a mounting hole formed in a structure.
Insulating liquid in the container to be mounted on the enlarged diameter portion of the tube body is filled, the thin metal wires and a pair of electrodes at one end to each other are connected to each other via the metal thin wire is dipped in the insulative liquid, before
The thin metal wire is arranged in the tube axis direction of the tube, and the other end of the electrode is
A tube mounting device, which is connected to a condenser .