JP3410814B2 - Different diameter pipe joint device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boiling water reactor, for example.
Applied to repairing pipe defects in
After removing a defect such as a crack that has occurred near the joint
Pipe fitting device suitable for pipe connection without welding
About. [0002] Austenitic stainless steel and nickel
Reactor pressure vessel and structural materials inside the reactor such as
Welding is used for joining the materials. Form near the weld
In the heat-affected zone formed, chromium carbide precipitates at grain boundaries,
Intergranular corrosion or intergranular corrosion cracking
May be born. [0003] The parts attached to the reactor pressure vessel as described above
If a crack is found at the position
To fill the hole by heat input by
Use welding such as attaching a plate and joining its surroundings by welding
Repair method was considered. [0004] However, this repair method is not suitable for the vicinity of a weld.
A new heat affected zone is created in the
The contradiction of forming a high part occurs. Therefore,
A technique for repair joining by a method other than joining is desired. Conventionally, pipes of the same diameter are joined by a shape
Techniques using memory alloys have been applied. FIG.
Sectional drawing which shows the connection method of the pipe joint using a shape memory alloy
It is. In this connection method, defective piping is newly added.
Repaired by replacing with new piping
Equivalent results can be obtained. In FIG. 10, reference numeral 1 denotes a repair or a joint.
Two pipes of the same diameter are shown. These plumbing
A thin inner tube 2 is arranged on the outer periphery of 1, 1 and
An outer tube 3 is arranged on the outer periphery. Inner peripheral surface of inner tube 2
Is formed with a plurality of annular projections 4 and these projections 4
By cutting into the outer peripheral surface of the pipe 1, 1
Join the cattle. Next, the joining procedure will be described. First,
The outer tube 3 is made of a shape memory alloy and is in liquid nitrogen (-70 ° C).
At the operating temperature (−20
° C). On the other hand, the inner diameter 2 is larger than the outer diameter of the pipe 1 before joining.
Its inner diameter is larger. And the inner diameter is expanded
The inner tube 2 is arranged in the outer tube 3 in the
The pipe 1 is inserted into the inside. The outer tube 3 shrinks as it returns to room temperature.
The inner pipe 2 is compressed. As a result, the inner diameter of the inner pipe 2 is
It is compressed until it becomes the same as the outer diameter of the pipe 1, and the inner circumference of the inner pipe 2
A plurality of protrusions 4 projecting from the surface cut into the outer peripheral surface of the pipe 1
Thus, the pipes 1 and 1 are joined together. At this time, the compression force of the outer pipe 3 and the
Shrinks until the drag is balanced, but leaves some remaining shape restoration
You. In other words, the inner diameter of the inner tube 3 can be compressed by 3%,
In a 2% compressed state,
A joint condition is provided. As the shape memory alloy, for example, (N
i-Ti), (Ni-Ti-α) (α: third metal element)
Is used. Also, joining different diameter pipes
As a method, for example, disclosed in Japanese Patent Application Laid-Open No. 1-29592.
ing. [0012] Conventional shape memory alloys
According to the piping joint device according to
This has already been put to practical use. But,
In current products, pipes of different diameters in furnace internals are joined
Can not be. Also, if there is a defect in the piping,
The pipe must be replaced with a completely new pipe.
And there is a problem in cost. On the other hand, a method for joining pipes of different diameters is described.
Therefore, for example, the technology of Japanese Patent Application Laid-Open No.
And the diameter and others are discontinuous.
There is a problem that the contraction strain is not constant. The present invention has been made to solve the above problems.
The purpose is to weld different diameter pipes together.
Without pipes, and replace pipes if defects occur
Piping can be connected only by removing the defective part without the need
Another object of the present invention is to provide a different diameter pipe joint device. Means for Solving the Problems [0015] The pipe fitting of the present invention has a different diameter.
The position can be any of (1) to (9) described below.
The problem can be solved more. (1) Outer surface provided between joints of two pipes with different outer diameters
A stepped connecting pipe and the outer periphery of the butt between the connecting pipe and the pipe
An inner tube that is attached and has a projection on the inner peripheral surface, and an outer periphery of the inner tube
The inner tube is compressed at the operating temperature to
Can be pressed against the pipe and connection pipe of the butt section.
And an outer tube made of a shape memory alloy that can be
You. (2) Joint of two pipes having different outer diameters
Butt one pipe at one end and
A connecting pipe into which another pipe can be fitted,
An inner pipe attached to the outer periphery of the butt between the connecting pipe and the pipe
And the outer circumference of the connecting pipe where the inner pipe and pipe are fitted
The projections of the inner tube and the inner surface of the connecting tube are
With a butted part and an outer pipe pressed against the pipe
It is characterized by the following. (3) Provided between two joints having different outer diameters
Two pipes can be fitted from both ends
A connecting pipe, and an inner surface of the connecting pipe attached to an outer periphery of the connecting pipe;
And a shape memory alloy outer tube for pressing the outer tube against the tube.
It is characterized by having. (4) Outer periphery of two pipe joints having different outer diameters
A stepped inner tube attached to the
It is attached to the outer circumference of the pipe and is made of a shape memory alloy.
An inner surface step that compresses the inner pipe and presses the protrusion against the above pipe
And an outer tube attached thereto. (5) Outside the joint of two pipes with different outer diameters
Inner tube mounted on the circumference and having protrusions with different heights on the inner circumferential surface
And a projection attached to the outer circumference of the inner pipe and pressing the projection against the pipe.
With a shape memory alloy outer tube
It is characterized by. (6) Outer periphery of two pipe joints having different outer diameters
A stepped inner tube that is attached to the
Pressing the projection against the above pipe
And a shape memory alloy outer tube
And (7) Between two pipe joints having different outer diameters
The connecting pipe to be provided and the
Attached, an inner tube with a projection on the inner surface, and on the outer periphery of this inner tube
Push the mounted projection against the pipe and connection pipe at the butt section
And an outer tube to be attached. (8) Between joints of two pipes having different outer diameters
A connection pipe with the same diameter as one of the pipes
Butt connection with pipes of the same diameter and different diameters
Inner pipes to be attached to the outer circumference
And the projections are connected to the
An outer tube pressed against the continuation tube. (9) Butting of two pipes having different outer diameters
The sleeve that can be attached closely to the outer periphery of the
The sleeve is uniformly wound around the outer circumference of the sleeve
And press the piping to compress the shape memory alloy wire and
It is characterized by having. (1) Between the joints of two pipes having different outer diameters,
Outer surface where each outer diameter is equal to the outer diameter of the pipe that meets
A stepped connection pipe is provided, and this connection pipe and the pipe
Each of the outer circumferences has an inner diameter with projections on the inner
A shape memory alloy outer tube is attached to the outer periphery of the inner tube.
This shape memory alloy outer tube is reduced in diameter at operating temperature,
Compress. As a result, the inner diameter of the inner pipe is
Compressed until the outer diameter of the piping and connecting
The multiple protrusions protruding from the inner peripheral surface of the
Cut into the outer peripheral surface, thereby connecting different diameter pipes
Joined through a tube. This different-diameter pipe joint device is connected to a different-diameter pipe welded joint.
If it is used as a repair method for a defect generated near the part,
Only need to cut out the defective part, replace the entire pipe
Need not be. (2) Between joints of two pipes having different outer diameters
Butt one pipe at one end and the other
Provide a connection pipe into which another pipe can be fitted,
Attach the inner pipe to the outer periphery of the joint between the connection pipe and the pipe
Connection between the inner pipe and the part where the pipe is fitted.
An outer tube made of a shape memory alloy is attached to the outer periphery of the connecting tube.
The outer tube made of this shape memory alloy is reduced in diameter at the operating temperature,
Compress the connecting pipe where the inner pipe and piping are fitted
Go. As a result, the inner pipe and the pipe were fitted.
The inner diameter of the connecting pipe of the part is
Compressed to the same outer diameter as the
Multiple projections or inner surface of connecting pipe
Press the outer peripheral surface of
The pipes of different diameters are connected via a connecting pipe. This different-diameter pipe joint device is connected to a different-diameter pipe welded joint.
If it is used as a repair method for a defect generated near the part,
Only need to cut out the defective part, replace the entire pipe
Need not be. (3) Between two joints having different outer diameters,
These two pipes can be fitted at both ends respectively
A connecting pipe is provided, and the outer periphery of the connecting pipe is made of a shape memory alloy.
Attach outer tube. Outer tube made of this shape memory alloy
Reduces the diameter at the operating temperature and compresses the connecting pipe. As a result, the connection of the portion where the pipe is fitted
Compress until the inside diameter of the pipe is the same as the outside diameter of each pipe
The inner surface of the connection pipe is pressed against the outer circumference of the pipe,
Therefore, the different-diameter pipes are joined via the connection pipe. This different-diameter pipe joint device is connected to a different-diameter pipe welded joint.
If it is used as a repair method for a defect generated near the part,
Only need to cut out the defective part, replace the entire pipe
Need not be. (4) Outside the joint of two pipes with different outer diameters
At the periphery, a projection is provided on the inner peripheral surface to match the outer diameter of the pipe joint.
An inner pipe with a step and an inner pipe
From a shape memory alloy with a step on the inner surface to match the shape of the
Attach outer tube. This outer tube made of shape memory alloy is used
The diameter is reduced at the temperature and the inner tube is compressed. As a result, the inner diameter of the inner pipe is
Compressed until it is the same as the outer diameter of the tube,
The multiple projections cut into the outer peripheral surface of the pipe,
Therefore, different diameter pipes are joined. This different-diameter pipe joint device is connected to a different-diameter pipe weld joint.
If it is used as a repair method for a defect generated near the part,
Only need to cut out the defective part, replace the entire pipe
Need not be. (5) Outside the joint of two pipes with different outer diameters
Around the circumference, protrusions with different heights
The inner tube provided with a rim and a shape memory
Attach a gold outer tube. From this shape memory alloy outer tube
The outer tube is reduced in diameter at the operating temperature and the inner tube is compressed. So
Until the inner diameter of the inner pipe becomes the same as the outer diameter of the pipe.
Compressed, multiple projections protruding from the inner peripheral surface of the inner pipe
Of the pipes of different diameters
Are combined. This different diameter pipe joint device is connected to a different diameter pipe welded joint.
If it is used as a repair method for a defect generated near the part,
Only need to cut out the defective part, replace the entire pipe
Need not be. (6) Outside the joint of two pipes with different outer diameters
With a projection on the inner peripheral surface, it fits the outer diameter of the pipe joint.
The inner tube with a step on the inner surface and the shape
Attach a metal alloy outer tube. This outer tube made of shape memory alloy
The inner pipe is compressed until its inner diameter is the same as the outer diameter of the pipe.
The multiple protrusions projecting from the inner peripheral surface of the
In this way, the pipes of different diameters are joined together. This different-diameter pipe joint device is connected to a different-diameter pipe welded joint.
If it is used as a repair method for a defect generated near the part,
Only need to cut out the defective part, replace the entire pipe
Need not be. (7) Between two pipe joints having different outer diameters
A connecting pipe having an outer diameter different from the two outer diameters,
At the outer periphery of each butt of the connecting pipe and pipe,
Attach outer tube similar to shape memory alloy around the inner tube
You. This shape memory alloy outer tube shrinks in diameter at operating temperature,
Compress the tube. As a result, the inner diameter of the inner pipe is
Compressed to the same outer diameter of the pipe and connecting pipe,
The multiple protrusions protruding from the inner peripheral surface of the
Cut into the outer peripheral surface, thereby joining different diameter pipes
Is done. This different-diameter pipe joint device is connected to a different-diameter pipe welded joint.
If it is used as a repair method for a defect generated near the part,
Only need to cut out the defective part, replace the entire pipe
Need not be. (8) Between joints of two pipes having different outer diameters
A connection pipe with the same diameter as one of the pipes
Butt connection with pipes of the same diameter and different diameters
An inner pipe attached to the outer circumference of the
Attach shape memory alloy outer tubes. This shape memory
The outer tube made of alloy is reduced in diameter at the operating temperature and the inner tube is compressed. As a result, the inner diameter of the inner pipe is
Compressed to the same outer diameter of the pipe and connecting pipe,
The multiple protrusions protruding from the inner peripheral surface of the
Cut into the outer peripheral surface, thereby joining different diameter pipes
Is done. This different-diameter pipe joint device is connected to a different-diameter pipe weld joint.
If it is used as a repair method for a defect generated near the part,
Only need to cut out the defective part, replace the entire pipe
Need not be. (9) Butting of two pipes having different outer diameters
Attach the sleeve closely to the outer periphery of the sleeve. More
Shape memory alloy wire is evenly wound around the outer surface of the sleeve
You. This shape memory alloy wire is stored in the length direction at the operating temperature.
Shrink and tighten the sleeve, thereby
The pipes are firmly joined together. This different diameter pipe joint device is connected to a different diameter pipe welded joint.
If it is used as a repair method for a defect generated near the part,
Only need to cut out the defective part, replace the entire pipe
Need not be. Embodiments of the present invention will be described in detail.
Embodiment 9 will be described with reference to FIGS.
You. The first to ninth embodiments are shown in FIGS.
Each is supported. (First Embodiment) As shown in FIG.
The two pipes denoted by reference numerals 5 and 6 have the same inner diameter but the outer diameter.
For pipes of different diameters, for example, the pipe 5
The pipe 6 is equivalent to a stainless steel in-core guide pipe.
It corresponds to a core housing. [0050] Between the joints of these pipes 5 and 6,
Are equal and the outer diameters of both ends meet,
A connection pipe 7 having an outer surface step which is equal to the outer diameter of 6 is arranged.
You. Here, the connection pipe 7 is made of the same material as the pipes 5 and 6. The protrusions of the connection pipe 7 and the pipes 5 and 6
While the thin inner tube 8 is arranged on the outer periphery of the joining portion,
An outer tube 9 is arranged on the outer periphery. Of the inner tube 8
A plurality of annular projections 10 are formed on the peripheral surface. The projections 10 of the pipes 5 and 6 and the connecting pipe 7
By cutting into the outer peripheral surface, pipes 5 and 6 of
Join. Here, the inner pipe 8 is made of the same material as the pipes 5 and 6.
And The outer tube 9 is made of a shape memory alloy, for example, (N
i-Ti-Nb) is used. Next, the joining procedure in the first embodiment will be described.
explain. At room temperature, the outer tube 9 made of a shape memory alloy
From the martensitic transformation end temperature at the time of cooling
Austenitic transformation start temperature)
Is expanded to 150 ° C (> Af (
-Steinite transformation end temperature))
The diameter is reduced. After returning to room temperature, Ms (cooling
Martensite transformation start temperature)
It remains in a state. After this, the operating temperature (288 ° C)
If exposed, the diameter will further decrease. The inner tube 8 is connected
Before joining, the inner diameter is larger than the outer diameter of the pipes 5, 6 and the joint pipe 7.
It is getting bigger. Then, the inside of the outer tube 9 whose inner diameter is expanded is
And the pipes 5 and 6 in the inner pipe 8.
Insert the connection pipe 7. Once heated to 150 ° C
To shrink the outer tube 9 and then go through room temperature and operating temperature.
As a result, the outer pipe 9 further contracts and compresses the inner pipe 8. As a result, the inner diameter of the inner pipe 8 is
And the inner pipe is compressed until it becomes the same as the outer diameter of the connecting pipe 7.
8, a plurality of projections 10 protruding from the inner surface
It penetrates the outer peripheral surface of the connecting pipe 7, whereby the pipe 5 and
And 6 are connected via a connecting pipe 7. The different diameter pipe joint device according to the first embodiment.
As a repair method for defects near weld joints of different diameter pipes
When using, cut off the defective part and cut it out
The connecting pipe 7 is arranged at the location, and the above-described joining procedure is performed. At this time, the length of the cutting margin is determined by the inner tube 8 and
The inner pipe 8 and the inner pipe 8 are connected so that the pipes 5 and 6 can pass through the outer pipe 9.
It may be as long as the axial length of the outer pipe 9, and the entire pipe is replaced.
There is no need to learn. (Second Embodiment) As shown in FIG.
5 and 6 are different diameter pipes having the same inner diameter but different outer diameters.
For example, in terms of furnace internals, stainless steel
Equivalent to core-core guide tube and in-core housing
It is. A pipe 6 is provided between the joints of the pipes 5 and 6.
The pipe 5 has the same outer diameter as the
A connection pipe 11 having an inner surface step processed so as to be able to be arranged.
Here, the connection pipe 11 is made of the same material as the pipes 5 and 6. The outer periphery of the butt between the connection pipe 11 and the pipe 6
The thin inner tube 8 is arranged in the
The pipe 5 of the connecting pipe 11 is fitted, and an outer pipe 9 is arranged on the outer periphery of the portion.
ing. A plurality of annular projections 10 are formed on the inner peripheral surface of the inner tube 8.
The protrusion 10 is formed outside the pipe 6 and the connection pipe 11.
Bites into the peripheral surface, while the pipe 5 of the connecting pipe 11 is fitted
When the inner peripheral surface presses the outer peripheral surface of the pipe 5,
The pipes 5 and 6 are joined. Note that the inner pipe 8 is
6 and the same material. The outer tube 9 is made of a shape memory alloy.
For example, (Ni-Ti-Nb) is used. Next, the joining procedure in the second embodiment will be described.
explain. At room temperature, the outer tube 9 made of a shape memory alloy
From the martensitic transformation end temperature at the time of cooling
Austenitic transformation start temperature)
Is expanded to 150 ° C (> Af (
-Steinite transformation end temperature))
The diameter is reduced. After returning to room temperature, Ms (cooling
Martensite transformation start temperature)
It remains in a state. After this, the operating temperature (288 ° C)
If exposed, the diameter will further decrease. The inner tube 8 is connected
Before joining, the inner diameter is larger than the outer diameter of the pipe 6 and the joint pipe 11.
It's getting worse. Then, the inside of the outer tube 9 in a state where the inner diameter is expanded is
The inner pipe 8 is arranged in the inner pipe 8 and connected to the pipe 6 in the inner pipe 8.
Insert tube 11. Also, outside of the expanded state
Insert the end of the connection pipe 11 into the diameter 9 and place it inside the connection pipe 11.
Fit the tube 5. Once heated to 150 ° C., the outer tube 9
Is shrunk, and then, after room temperature and operating temperature, the outer tube 9 is
It contracts further and fits in the pipe 5 of the inner pipe 8 and the connecting pipe 11.
Compress the part. As a result, the inner diameter of the inner pipe 8 is
And the inner tube 8 is compressed until it becomes the same as the outer diameter of the connecting tube 11.
A plurality of protrusions 10 protruding from the inner surface are used to connect the pipes 5 and 6 and the connection.
It bites into the outer peripheral surface of the pipe 11, while the pipe 5 of the connecting pipe 11 fits
The inner peripheral surface of the inserted portion presses the outer peripheral surface of the pipe 5. It
Pipes 5 and 6 are connected via connecting pipe 11
You. [0068] Piping joint device of different diameter according to the second embodiment
As a repair method for defects near weld joints of different diameter pipes
If used, cut off the defective part and install piping 5 and
By displacing the tips of the pipes 6 and 6 from the center line, the connecting pipe 11
And perform the above-described joining procedure. At this time, cut off
Is only defective and there is no need to replace the entire pipe.
No. (Third Embodiment) As shown in FIG.
5 and 6 are different diameter pipes having the same inner diameter but different outer diameters.
For example, in terms of furnace internals, stainless steel
Equivalent to core-core guide tube and in-core housing
It is. Between the joints of these pipes 5 and 6, both ends
Inner surface where pipes 5 and 6 can be fitted respectively
The stepped connection pipe 12 is arranged. Here, the connecting pipe 12 is connected to the pipe 5,
6 and the same material. An outer pipe 9 is arranged on the outer periphery of the connection pipe 12.
ing. The inner peripheral surface of the connection pipe 12 is the outer peripheral surface of the pipes 5 and 6.
The pipes 5 and 6 of different diameters are joined by pressing
You. Here, the outer tube 9 is made of a shape memory alloy, for example, (Ni
-Ti-Nb) is used. Next, the joining procedure in the third embodiment will be described.
explain. At room temperature, the outer tube 9 made of a shape memory alloy
From the martensitic transformation end temperature at the time of cooling
Austenitic transformation start temperature)
Is expanded to 150 ° C (> Af (
-Steinite transformation end temperature))
The diameter is reduced. After returning to room temperature, Ms (cooling
Martensite transformation start temperature)
It remains in a state. After this, the operating temperature (288 ° C)
If exposed, the diameter will further decrease. The connection pipe 12
Before joining, fit each of the outer diameters of pipes 5 and 6
The inside diameter of the inserted part is large. Then, the inside of the outer tube 9 in a state where the inner diameter is expanded is
The connection pipe 12 is arranged in the connection pipe 12 and the pipes 5 and
And 6. Once heated to 150 ° C,
The outer tube 9 is shrunk, and then, after room temperature and operating temperature,
The tube 9 further contracts and compresses the connecting tube 12. As a result, the inside diameter of the connection pipe 12 is
Compressed to the same outer diameter as
The peripheral surface presses against the outer peripheral surfaces of the pipes 5 and 6, thereby
The pipes 5 and 6 are connected via a connecting pipe 12. This different-diameter pipe joint device is connected to a different-diameter pipe welded joint.
If it is used as a repair method for a defect generated near the part,
Cut off the defective part, and center on the tip of pipes 5 and 6.
The connection pipe 12 is arranged by shifting the
Perform joint procedures. At this time, the margin is only for the defective part.
There is no need to replace the entire pipe. (Fourth Embodiment) As shown in FIG.
5 and 6 are different diameter pipes having the same inner diameter but different outer diameters.
For example, in terms of furnace internals, stainless steel
4 shows an incoa guide tube and an incoa housing. On the outer periphery of the butted portion of the pipes 5 and 6,
A thin inner tube 13 is arranged, and an outer tube
14 are located. Connection of pipes 5 and 6 to inner pipe 13
There is a step according to the outer diameter shape of the part, the inner surface of the inner tube 13
A plurality of annular projections 10 are formed on the base. This projection 10 is arranged
Piping of different diameter by biting into the outer peripheral surface of pipes 5 and 6
5 and 6 are joined. Also, the inner pipe 13 is formed on the inner peripheral surface of the outer pipe 14.
There are steps according to the shape. Here, the inner pipe 13 is a pipe
The same kind of material as 5, 6 is used. In addition, the outer tube 14 has a shape memory
Made of gold, for example, (Ni-Ti-Nb)
Is done. Next, the joining procedure in the fourth embodiment will be described.
explain. At room temperature, the outer tube 14 made of a shape memory alloy
From the martensitic transformation end temperature at the time of cooling
Austenitic transformation start temperature)
Is expanded to 150 ° C (> Af (
-Steinite transformation end temperature))
The diameter is reduced. After returning to room temperature, Ms (cooling
Martensite transformation start temperature)
It remains in a state. After this, the operating temperature (288 ° C)
If exposed, the diameter will further decrease. The inner tube 13 is connected
Before joining, the outer diameter of pipes 5 and 6
The inside diameter is large. Then, the inside of the outer tube 14 in a state where the inside diameter is expanded is
The inner pipe 13 is disposed in the inner pipe 13 and the pipe 5 and
Insert 6. Once heated to 150 ° C, the outer tube
After shrinking the outer tube 14 at room temperature and operating temperature,
Further contracts and compresses the inner tube 13. As a result, the inner diameter of the inner tube 13 is
Compressed until they are the same as the outer diameters of pipes 5 and 6, respectively.
A plurality of protrusions 10 protruding from the inner surface of the inner pipe 13
6, so that the pipes 5 and 6
Be combined. This different-diameter pipe joint device is connected to a different-diameter pipe welded joint.
If it is used as a repair method for a defect generated near the part,
Cut off the defective part, and move the tip of the pipe 5 away from the center line.
The inner tube 13 and outer tube 14
And perform the joining procedure described above. At this time, the cutting margin is defective
It is only a part and there is no need to replace the entire pipe. (Fifth Embodiment) As shown in FIG.
5 and 6 are different diameter pipes having the same inner diameter but different outer diameters.
For example, in terms of furnace internals, stainless steel
4 shows an incoa guide tube and an incoa housing. The outer periphery of the butted portion of the pipes 5 and 6
A thin inner tube 15 is arranged, and an outer tube
9 are arranged. On the inner peripheral surface of the inner pipe 15, the pipe 5 and
A plurality of rings having different heights according to the outer diameter shape of the joint of No. 6
Protrusions 16 and 17 are formed. The projections 16 and 17 are connected to the pipe 5 and
Biting into the outer peripheral surface of
And 6 are joined. Here, the inner pipe 15 is of the same type as the pipes 5 and 6.
Materials. The outer tube 9 is made of a shape memory alloy, for example,
For example, (Ni-Ti-Nb) is used. Next, the joining procedure in the fifth embodiment will be described.
explain. At room temperature, the outer tube 9 made of a shape memory alloy
From the martensitic transformation end temperature at the time of cooling
Austenitic transformation start temperature)
Is expanded to 150 ° C (> Af (
-Steinite transformation end temperature))
The diameter is reduced. After returning to room temperature, Ms (cooling
Martensite transformation start temperature)
It remains in a state. After this, the operating temperature (288 ° C)
If exposed, the diameter will further decrease. The inner tube 15 is connected
Before joining, the protrusions 16 and
The inside diameter of 17 parts is large. Then, the inside of the outer tube 9 in the state where the inner diameter is expanded is
In addition to disposing the inner pipe 15 in the
Insert 6. Once heated to 150 ° C, the outer tube
9 is shrunk and then passed through room temperature and operating temperature.
Further contracts and compresses the inner tube 15. As a result,
A plurality of protrusions 16 having different heights protruding from the inner surface of the pipe 15.
And 17 penetrate the outer peripheral surfaces of pipes 5 and 6, thereby
The pipes 5 and 6 are connected. This different-diameter pipe joint device is connected to a different-diameter pipe welded joint.
If it is used as a repair method for a defect generated near the part,
Cut off the defective part, and move the tip of the pipe 5 away from the center line.
The inner tube 15 and the outer tube 9
And perform the joining procedure described above. At this time, the cutting margin is defective
It is only a part and there is no need to replace the entire pipe. (Sixth Embodiment) As shown in FIG.
5 and 6 are different diameter pipes having the same inner diameter but different outer diameters.
For example, in terms of furnace internals, stainless steel
Equivalent to core-core guide tube and in-core housing
In the outer periphery of the butted portion of the pipes 5 and 6,
Tube 18 is arranged, and outer tube 9 is arranged on the outer periphery
Have been. Joining of pipes 5 and 6 to the inner peripheral surface of inner pipe 18
There is a step according to the outer diameter of the part, and more than one
A projection 10 is formed. The projections 10 erode on the outer peripheral surfaces of the pipes 5 and 6.
By inserting, the pipes 5 and 6 having different diameters are joined.
Here, the inner pipe 18 is made of the same material as the pipes 5 and 6. Outside
The tube 9 is made of a shape memory alloy, for example, (Ni-Ti-N
b) is used. Next, the joining procedure in the sixth embodiment will be described.
explain. 9 made of a shape memory alloy has Mf at room temperature.
(Martensitic transformation end temperature during cooling) to As (
Austenite transformation start temperature during heating)
The inner diameter is expanded, and 150 ℃ (> Af (when heated)
Austenite transformation end temperature))
And the diameter is reduced. Thereafter, even when the temperature returns to room temperature, Ms (cooling
Martensite transformation start temperature)
It remains in a state. After this, the operating temperature (288 ° C)
If exposed, the diameter will further decrease. The inner tube 18 is connected
Before joining, each step projection from the outer diameter of pipes 5 and 6
The inside diameter is large. Then, the outer tube 9 with the inner diameter expanded is
The inner pipe 18 is disposed in the inner pipe 18 and the pipe 5 and
Insert 6. Once heated to 150 ° C, the outer tube
9 is shrunk and then passed through room temperature and operating temperature.
Further contracts and compresses the inner tube 18. As a result, the inner diameter of the inner pipe 18 is
Compressed until they are the same as the outer diameters of pipes 5 and 6, respectively.
A plurality of protrusions 10 protruding from the inner surface of the inner pipe 18
6, so that the pipes 5 and 6
Be combined. This different-diameter pipe joint device is connected to a different-diameter pipe welded joint.
If it is used as a repair method for a defect generated near the part,
Cut off the defective part, and move the tip of the pipe 5 away from the center line.
The inner tube 18 and the outer tube 9 on the outer periphery.
And perform the joining procedure described above. At this time, the cutting margin is defective
It is only a part and there is no need to replace the entire pipe. (Seventh Embodiment) As shown in FIG.
5 and 6 are different diameter pipes having the same inner diameter but different outer diameters.
For example, in terms of furnace internals, stainless steel
4 shows an incoa guide tube and an incoa housing. An inner diameter is provided between the joints of the pipes 5 and 6.
Is different from the outer diameter of pipes 5 and 6 where the outer diameters are equal
The connection pipe 19 is placed. Here, connecting pipe 19 is connected to pipes 5 and 6.
Use the same material. This connection pipe 19 and each of pipes 5 and 6
In the outer periphery of the butted portion, the same inside as the thin-walled embodiment (4) is used.
A tube 13 is arranged, and an outer periphery thereof is provided with an embodiment (4).
An outer tube 14 similar to the above is disposed. The inner pipe 13 has a pipe 5 or 6 and a connection.
There is a step according to the outer diameter of the joint of pipe 19,
Further, a plurality of projections 10 are formed. This projection 10 is
By biting into the outer peripheral surface of 5, 6 and connecting pipe 19,
The pipes 5 and 6 having different diameters are joined. Also, the inner peripheral surface of the outer tube 14 is formed into the shape of the inner tube 13.
There is a step together. Here, the inner pipe 13 is
And the same type of material. The outer tube 14 is made of a shape memory alloy.
For example, (Ni-Ti-Nb) is used.
You. Next, the joining procedure in the seventh embodiment will be described.
explain. At room temperature, the outer tube 14 made of a shape memory alloy
From the martensitic transformation end temperature at the time of cooling
Austenitic transformation start temperature)
Is expanded to 150 ° C (> Af (
-Steinite transformation end temperature))
The diameter is reduced. Thereafter, even when the temperature returns to room temperature, Ms (cooling
Martensite transformation start temperature)
It remains in a state. After this, the operating temperature (288 ° C)
If exposed, the diameter will further decrease. The inner tube 13 is connected
Before joining, each step from the outer diameter of the outer diameter 19 of the pipes 5 and 6
The inner diameter of the projection of the part is large. Then, the outer tube 14 in the state where the inner diameter is expanded is
The inner pipe 13 is disposed in the inner pipe 13 and the pipes 5 and 6 are
Insert the connecting pipe 19. Once heated to 150 ° C
To shrink the outer tube 14, and then pass through room temperature and operating temperature.
As a result, the outer tube 14 further contracts and compresses the inner tube 13. As a result, the inner diameter of the inner tube 13 is
The outer diameter of the pipe 5 or 6 and the connecting pipe 19 must be the same.
And a plurality of protrusions protruding from the inner surface of the inner tube 13
10 bites into the outer peripheral surfaces of the pipes 5 and 6 and the connection pipe 19,
Thereby, the pipes 5 and 6 are connected via the connecting pipe 19.
You. This different-diameter pipe joint device is connected to a different-diameter pipe welded joint.
If it is used as a repair method for a defect generated near the part,
Cut off the defective part, and connect the connecting pipe 19 to the cut off part.
And perform the joining procedure described above. At this time, the length of the cutting margin is determined by the inner tube 13 and
The inner pipe 13 and the inner pipe 13 are inserted so that the pipes 5 and 6 can pass through the outer pipe 14.
The length of the pipe 14 is about the axial length, and the entire pipe is replaced.
There is no need to learn. In FIG. 7, an inner tube 13 and an outer tube 14 are examples.
(5) Inner tube 15 and outer tube 9 or in embodiment (6)
It may be a tube and an outer tube 9. (Eighth Embodiment) As shown in FIG.
5 and 6 are different diameter pipes having the same inner diameter but different outer diameters.
For example, in terms of furnace internals, stainless steel
4 shows an incoa guide tube and an incoa housing. An inner diameter is provided between the joints of the pipes 5 and 6.
Different from the outside diameter of the pipe 5 where the outside diameters are equal
Place 20. Here, the connecting pipe 20 is made of the same material as the pipes 5 and 6.
Charge. Around the butted portion of the connecting pipe 20 and the pipe 5
A thin upper inner tube 8 is arranged, and on the outer periphery thereof,
An outer tube 9 is arranged. Further, the connection pipe 20 and the pipe 6 are butted.
A thin inner tube 13 similar to that of the fourth embodiment is arranged around the outer periphery of the stub.
And the outer periphery thereof has a lower portion similar to that of the fourth embodiment.
An outer tube 14 is arranged. Outer diameter type of inner tube 8 and joint
A plurality of protrusions are formed on the inner peripheral surface of the inner pipe 13 that is stepped according to the shape.
A protrusion 10 is formed, and this protrusion is connected to the pipes 5 and 6 and the connection.
By digging into the outer peripheral surface of the connecting pipe 20, different-diameter pipes 5 and
And 6 are joined. The inner peripheral surface of the outer tube 14 is
There are steps according to the shape. Where inner tubes 8 and 13
Are made of the same material as the pipes 5 and 6. The outer tube 9 and
14 is a shape memory alloy, for example, (Ni-Ti-Nb)
Is used. Next, the joining procedure in the eighth embodiment will be described.
I will tell. The outer tubes 9 and 14 made of shape memory alloy have M
f (Martensite transformation end temperature at cooling)
(Austenite transformation start temperature during heating)
The inner diameter is expanded, and 150 ° C (> Af (
Austenite transformation end temperature during heating))
The diameter is reduced. Thereafter, even when the temperature returns to room temperature, Ms
Martensite transformation start temperature)
It remains in a state. After this, the operating temperature (288 ° C)
If exposed, the diameter will further decrease. The upper inner pipe 8 is connected to the pipe 5 before joining.
The inside diameter of the connection pipe 20 is larger than the outside diameter. Further
The lower inner pipe 13 has the outer diameter of the pipe 6 and the connecting pipe 20 before joining.
The inner diameter of each step is larger. Then, the inside of the outer tube 9 whose inner diameter is expanded is
The inner pipe 8 is further disposed, and the inner pipe 13 is disposed within the outer pipe 14.
At the same time, the pipe 6 and the connection pipe 20 are inserted into the inner pipe 8. one
By shrinking the outer tubes 9 and 14 by heating to 150 ° C
After passing through room temperature and operating temperature, the outer tubes 9 and 14
Further contracts and compresses the inner tubes 8 and 13. As a result, the inner diameter of the inner pipe 8 is
And the outer diameter of the connecting pipe 20 and the inner diameter of the inner pipe 13
Until the outer diameter of the pipe 6 and the connecting pipe 20 become the same
A plurality of protrusions compressed and protruding from the inner surfaces of the inner pipes 8 and 13
The starting 10 bites into the outer peripheral surfaces of the pipes 5, 6 and the connecting pipe 20,
The pipes 5 and 6 are thereby connected via the connecting pipe 20.
It is. This different-diameter pipe joint device is connected to a different-diameter pipe welded joint.
If it is used as a repair method for a defect generated near the part,
Cut off the defective part, and connect the connecting pipe 20 to the cut-out part.
And perform the joining procedure described above. At this time, the length of the cutting margin is set to the inner tubes 8, 13 and
And inner pipe 8, so that pipes 5 and 6 can pass through
13 and the length of the pipes 9 and 14 in the axial direction may be sufficient.
There is no need to replace the whole. In addition, in FIG.
The outer tube 14 and the outer tube 14 are the inner tube 15 and the outer tube 9 shown in the fifth embodiment.
Alternatively, the inner tube 18 and the outer tube 9 shown in the sixth embodiment may be used.
You may. (Ninth Embodiment) As shown in FIG.
5 and 6 are different diameter pipes having the same inner diameter but different outer diameters.
For example, in terms of furnace internals, stainless steel
Equivalent to core-core guide tube and in-core housing
It is. At the outer periphery of the butt of pipes 5 and 6,
While attaching the probe 21 closely,
The shape memory alloy wire 22 is wound uniformly. This
The leave 21 is made of the same material as the pipes 5 and 6. Also, the shape
The shape memory alloy wire 22 is made of, for example, (Ni-Ti-Nb).
Is used. The joining procedure in the ninth embodiment will be described.
I do. The shape memory alloy wire 22 has Mf (
From martensite transformation end temperature) to As (
(Stenite transformation start temperature) and extends in the length direction
150 ° C (> Af (Austen during heating)
Night transformation start temperature))
Shrink in the opposite direction. Thereafter, even when the temperature returns to room temperature, Ms
Martensite transformation start temperature)
It remains in a contracted state. After this, further use temperature
(288 ° C), it shrinks further in the length direction.
Good. A sleeve 21 is provided around the butted portion of the pipes 5 and 6.
Closely attached and expanded in the longitudinal direction
The shape memory alloy wire 22 is uniformly wound around the outer periphery. Once heated to 150 ° C., the shape
The metal alloy wire 22 is shrunk in the length direction and then used at room temperature.
After the application temperature, the shape memory alloy wire 22 contracts further,
Tighten the leave 21. Thereby the pipes 5 and 6
Is firmly fixed to and coupled to the sleeve 21. The shape
Both ends of the shape memory alloy wire 22 are connected to the sleeve 21 by mechanical means.
Is fixed to the end. This different-diameter pipe joint device is connected to a different-diameter pipe welded joint.
If it is used as a repair method for a defect generated near the part,
Cut off the defective part, and move the tip of the pipe 5 away from the center line.
The sleeve 21 around the outer periphery,
Perform the joining procedure described above. At this time, the margin is only the defective part
There is no need to replace the entire piping. According to the present invention, joining of different-diameter pipes is achieved.
Can be done without welding and if a defect occurs
No need to replace pipes, only defective parts
The joining of the pipes of different diameters can be carried out by welding.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing a first embodiment of a different-diameter pipe joint device according to the present invention. FIG. 2 is a longitudinal sectional view showing a second embodiment of the different diameter pipe joint device according to the present invention. FIG. 3 is a longitudinal sectional view showing a third embodiment of the pipe joint device of different diameter according to the present invention. FIG. 4 is a longitudinal sectional view showing a fourth embodiment of the pipe joint device of different diameter according to the present invention. FIG. 5 is a longitudinal sectional view showing a fifth embodiment of the pipe joint device of different diameter according to the present invention. FIG. 6 is a longitudinal sectional view showing a sixth embodiment of the different diameter pipe joint device according to the present invention. FIG. 7 is a longitudinal sectional view showing a seventh embodiment of the pipe joint device of different diameter according to the present invention. FIG. 8 is a longitudinal sectional view showing an eighth embodiment of the different diameter pipe joint device according to the present invention. FIG. 9 is a longitudinal sectional view showing a ninth embodiment of the different-diameter pipe joint device according to the present invention. FIG. 10 is a longitudinal sectional view showing a conventional pipe joint device. [Description of Signs] 1 ... Piping (same diameter), 2 ... Inner diameter, 3 ... Outer pipe, 4 ... Protrusion, 5
... Piping (different diameter) 6 ... Piping (different diameter), 7 ... Connected pipe with outer step, 8 ... Thin inner pipe, 9 ... Outer pipe made of shape memory alloy, 10 ... Protrusion, 11 ... Connected pipe with inner step 12 ... connecting pipe, 13 ... inner pipe (stepped), 14 ... outer pipe (stepped), 15 ... inner pipe, 16 ... projection (large), 17 ... projection (small), 18 ... inner pipe (stepped thick), 19
... Connecting pipe (thick), 20 ... Connecting pipe (thin), 21 ... Sleeve, 22 ... Shape memory alloy wire

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Motoshi Tsubota 2-4, Suehirocho, Tsurumi-ku, Yokohama-shi, Kanagawa Pref. JP-A-3-84294 (JP, A) JP-A-6-137475 (JP, A) JP-B-4-2369 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16L 25 / 00 F16L 13/00 F16L 13/14

Claims (1)

(57) [Claims] [Claim 1] At the outer periphery of a joint between two pipes having different outer diameters.
An inner tube equipped with projections having different heights on the inner peripheral surface ,
The protrusion is attached to the outer periphery of the inner pipe and presses the protrusion against the pipe.
A pipe joint device having a shape memory alloy outer pipe that can be used.