JPH1164200A - Pressure keeping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure keeping device with which man-hours necessary for a pressure test of a pressure vessel such as a boiler drum provided with a large number of nozzles is reduced. SOLUTION: This pressure keeping device 1 is provided with a main body member 4, a pushing mechanism 5, and an engaging mechanism 6. The main body member 4 is constituted of a first main body member 7 and a second main body member 8 which are so formed as to be freely inserted into a nozzle 2 along the axial line P and mutually connected in respective end parts. A plurality of square rings 11 are installed in the outer circumferential face of the first main body member 7. The pushing mechanism 5 is installed at the end part 7a positioned in the base end side 1a of the first main body member 7 and is constituted of a pressurizing flange 13 and a pressurizing bolt 14. The engaging mechanism 6 is installed in the end part positioned in the tip end side 1b of the second main body member 8 and is constituted of a rotary pin 24, a rotary plate 25, and an extension spring 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure holding device used for a pressure test of a pressure vessel such as a boiler drum provided with a large number of nozzles.

[0002]

2. Description of the Related Art A boiler is provided with a large number of nozzles such as 150 to 200 nozzles on a drum as a pressure vessel for connecting various pipes. This nozzle is generally attached to the drum by welding or the like. The boiler is heated by a high-temperature flame and a high-pressure gas, and stores high-pressure steam and hot water inside the drum and the like.

[0003] For this reason, before installing the boiler, a pressure test of a drum provided with a nozzle is conducted to check whether the drum itself and a welded joint between the nozzle and the nozzle are damaged. Have been done.

Conventionally, a pressure test of a drum provided with a nozzle is performed by welding a flange plate or the like to a tip portion of most of the nozzles to seal the nozzle, and at a desired pressure from some nozzles or the like. By supplying a pressurized fluid having
Then, after confirming whether or not the drum and the welded joint portion between the drum and the nozzle are damaged, the flange plate is cut and removed.

[0005]

In the above-mentioned conventional pressure test, a flange plate is welded to the tip of most nozzles before the test, and the flange plate is cut and removed after the test. The man-hours required for the welding work and the cutting work tend to increase, and the man-hour required for the pressure test tends to increase.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a pressure holding device capable of suppressing the number of steps required for a pressure test of a pressure vessel such as a drum of a boiler provided with a nozzle. .

[0007]

In order to solve the above-mentioned problems and to achieve the object, a pressure holding device according to the present invention has a pressure vessel having a nozzle for connecting an external pipe. A pressure holding device for testing, comprising: a main body member insertable into the nozzle, an elastic member provided on an outer peripheral surface of the main member, and pressing the elastic member along an axial direction of the nozzle. And a locking mechanism provided on the main body member and locking the main body member inserted into the nozzle to the inner surface of the pressure vessel, wherein the main body member is inserted into the nozzle and In a state where the locking mechanism is locked to the inner surface of the pressure vessel by being fixed to the inner surface of the pressure vessel, the pressing mechanism presses the elastic member in the axial direction of the nozzle so that the elastic member becomes an outer periphery of the main body member. Bulges in the direction and on the inner surface of the nozzle It is characterized in that wear to seal the pipe stand.

According to a second aspect of the present invention, there is provided a pressure holding device for a pressure test of a pressure vessel provided with a nozzle having a screw portion at a tip thereof, wherein the main body is insertable into the nozzle. A member, an elastic member provided on an outer peripheral surface of the main body member, a pressing mechanism for pressing the elastic member along an axial direction of the nozzle, and a screw provided on the main body member and screwed into a screw portion of the nozzle. Fixing means for fixing the main body member inserted into the nozzle to the pressure vessel by combining the main member with the threaded portion of the nozzle. In a state in which the elastic member is fixed to the pressure vessel by screwing, the pressing mechanism presses the elastic member in the axial direction of the nozzle, so that the elastic member expands in the outer peripheral direction of the main body member and adheres to the inner surface of the nozzle. To seal the nozzle It is a symptom.

[0009]

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

As shown in FIG. 1, a pressure holding device 1 includes a drum 3 as a pressure vessel provided with a large number of nozzles 2 of a boiler.
Is a device that seals most of the nozzles 2 when performing a pressure resistance test of the main body member 4, the pressing mechanism 5, and the locking mechanism 6.
And

The main body member 4 is formed into a cylindrical shape which can be inserted into the nozzle 2 along the axis P, and the first main body member 7 and the second main body member 8 whose ends are connected to each other. It is composed of

In the present embodiment, the first main body member 7 is a member located on the upper side in the drawing and on the proximal side 1a of the apparatus 1, and the second main body member 8 is located on the lower side in the drawing. Further, it is a member located on the distal end side 1b of the device 1.

The first body member 7 and the second body member 8 are
Threaded grooves 7a and 8a are formed on the connecting portion to be screwed with each other, and the screw grooves 7a and 8a are connected by screwing each other. A packing 9 is provided between the first main body member 7 and the second main body member 8 to ensure airtightness between the first main body member 7 and the second main body member 8. .

An end of the first main body member 7 located on the distal end side 1b of the device 1 has a flange 1 projecting outward.
0 is formed. On the outer peripheral surface of the first main body member 7,
An angular ring 11 as an elastic member is provided at a position facing the inner surface of the nozzle 2 when the device 1 is inserted into the nozzle 2 and the locking mechanism 6 is locked on the inner surface of the drum 3.

The square ring 11 is made of an elastic material such as rubber, for example, and has a square cross section and is formed in a ring shape surrounding the outer peripheral surface of the first main body member 7 as shown in FIG. A plurality of the angular rings 11 are provided along the axis P from the proximal side 1a to the distal side 1b, and five in the illustrated example.

The corner ring 11 located at the most distal end 1b is in contact with the flange 10, and the corner rings 11 are provided with spacers 12 which do not elastically deform. The spacer 12 is also provided on the proximal end 1a of the ring 11 located closest to the proximal end 1a.

The pressing mechanism 5 is provided at an end 7a (base end) located on the base side 1a of the first main body member 7. The pressing mechanism 5 includes a pressing flange 13 provided on the outer periphery of the first main body member 7 and a pressing bolt 14. The pressing flange 13 is provided so as to be in contact with the spacer 12 located closest to the proximal end 1a from the proximal end 1a.

Further, a flange member 15 is provided on the base end side 1a of the pressure flange 13. The flange member 15 has an insertion hole 15a at the approximate center thereof into which the base end portion 7a of the first main body member 7 can be inserted, and the base end portion 7a is inserted into the insertion hole 15a. Screw member 16
It is fixed to the first main body member 7 by such as.

The flange member 15 includes the pressure bolt 1
4 is screwed, and a screw hole 17 is formed penetrating from the base side 1a to the distal side 1b. When the flange member 15 is fixed to the first main body member 7, the screw hole 17 is
Is provided at a position in contact with

A first main body member 7 formed in a cylindrical shape
Inside the main body member 7 from the proximal end 7a to the distal end 1a.
A drive shaft 18 extending to the end located at position b is provided.

The end 1 of the drive shaft 18 located on the proximal side 1a
8a protrudes from the base end portion 7a of the first main body member 7, and is driven by a person or the like by using a tool or the like.
Is provided with an operation unit 19 that can rotate the rotation about the axis P of the nozzle 2.

The end 1 of the drive shaft 18 located on the distal end 1b
Reference numeral 8b protrudes from an end located on the front end side 1b of the first main body member 7, and includes a feed screw member 20 having a male screw on the outer periphery at the front end. A packing 21 is provided between the drive shaft 18 and the first main body member 7 to ensure airtightness between the drive shaft 18 and the first main body member 7.

The second main body member 8 is provided with an internal thread on the inner surface facing the feed screw member 20 to be screwed with a male screw of the feed screw member 20. When the drive shaft 18 is rotated around the axis P of the nozzle 2, the feed screw member 20 can reciprocate along the axis P of the nozzle 2 as shown by an arrow T in the drawing.

The second main body member 8 is integrally provided with a plate member 22 at a substantially intermediate position in the longitudinal direction. Plate member 22
Has a block member 23 slidable along the axis P of the nozzle 2 at a substantially intermediate position.

The block member 23 has substantially flat end surfaces 23a and 23b located at both ends in the direction of the arrow T, and one end surface 23a is in contact with the front end surface of the feed screw member 20. The block member 23 is a feed screw member 2
0 protrudes toward the distal end 1b along the arrow T1 in the drawing.

The locking mechanism 6 is provided at an end of the second main body member 8 located on the distal end side 1b. The locking mechanism 6 includes a rotating pin 24, a pair of rotating plates 25, 25 rotatably supported by the rotating pin 24, and a tension spring 26 as biasing means. .

As shown in FIGS. 1 to 3, the rotation pin 24 is provided along a direction substantially perpendicular to the axis P of the nozzle 2, and both ends thereof are attached to the second main body member 8. I have. Each of the rotating plates 25 and 25 has a locking portion 27 that can be locked to the inner surface of the drum 3 after the device 1 is inserted into the nozzle 2, and the locking portion 27 is And a base end surface 28 extending substantially perpendicular to the axis P when locked to the inner surface of the base. Locking part 27
Is provided with a spring locking pin 29 substantially parallel to the rotation pin 24.

Further, the second main body member 8 is provided with a main body spring locking pin 30 at the distal end 1b of the rotation pin 24 and the rotation plate 25. The main body spring locking pin 30 is provided substantially parallel to the rotation pin 24 and substantially at the center of the second main body member 8.

The tension spring 26 is provided between the rotating plates 25 and 2.
Spring locking pin 2 provided on each locking portion 27
9 and a main body spring locking pin 30. As shown in FIG. 4, the rotating plates 25 are urged by the elastic force of the spring 26 in a direction in which the locking portion 27 is retracted from the outer periphery of the second main body member 8, that is, in a direction that does not project. I have.

According to the above-described structure, as shown in FIG. 4, the feed screw member 20 is positioned at the base end 1a by operating the operating portion 19 of the drive shaft 18, and
5 is inserted into the nozzle 2 with the pressure holding device 1 in a state in which the 5 locking portions 27 do not protrude from the outer periphery of the second main body member 8.

Thereafter, the operation section 19 of the drive shaft 18 is rotated to feed the feed screw member 20 to the distal end 1b of the apparatus 1. Then, with the movement of the feed screw member 20, the block member 23 is protruded from the plate member 22 toward the distal end side 1b along the arrow T1 in the drawing, and the rotating plate 25,
25 will be pressed.

The rotating plates 25 are provided with rotating pins 24.
Therefore, until each base end surface 28 comes into contact with the end surface 23b of the block member 23, the base end surface 28 rotates along the arrow K in the drawing against the elastic force of the tension spring 26.

When the base end surface 28 contacts the end surface 23b of the block member 23 as shown in FIG.
Projecting from the outer periphery of the main body member 8 and locked to the inner surface of the drum 3. As described above, the pressure holding device 1 is fixed to the nozzle 2.

After fixing to the nozzle 2, the pressure bolt 14 is screwed in, and the pressure flange 15 is pressed toward the distal end 1 b of the apparatus 1. The plurality of provided angular rings 11 are pressed through the spacers 12 along the axis P direction of the nozzle 2.

The angular ring 11 is made of an elastic material such as rubber, and its inner peripheral surface is regulated by the main body member 7, so that it expands toward the outer peripheral direction of the main body member 4. Then, the angular ring 11 comes into close contact with the inner surface of the nozzle 2 to seal the nozzle 2. Thereafter, a pressure test of the drum 3 is performed.

After the pressure test is completed, the pressure bolt 1
The screw 4 is loosened to return the angular ring 11 to a state in which the square ring 11 does not adhere to the inner surface of the nozzle stub 2, and the operation unit 19 of the drive shaft 18 is operated to move the feed screw member 20 toward the proximal end 1 a.

Then, by the elasticity of the tension spring 26,
The locking portion 27 of the rotation plate 25 is returned to a state where it does not protrude from the outer periphery of the second main body member 8. Then, the device 1 is removed from the nozzle 2.

According to the present embodiment, fixing to and detaching from the nozzle 2 can be easily performed only by operating the operation section 19. Further, since the angular ring 11 is brought into close contact with the inner surface of the nozzle 2 by screwing the pressure bolt 14, the nozzle 2 can be easily sealed. Therefore, it is possible to reduce the number of steps required for the pressure test of the drum 3.

Since a plurality of square rings 11 are provided along the axis P of the nozzle 2, a pressurized fluid or the like used for the test is provided between the square ring 11 and the nozzle 2 during the pressure test of the drum 3. There is no leakage.

Further, the angular ring 11 is made of an elastic material such as rubber, and is pressed along the axis P of the nozzle 2 by a pressure bolt 14 or the like, and is tightly contacted with the inner surface of the nozzle 2 to hermetically seal the nozzle 2. Therefore, even if the inner surface of the nozzle 2 is formed relatively coarse, for example, with a surface roughness of 100 S or less and a processing intersection of the surface of about ± 1.0 mm, the nozzle 2 can be reliably sealed.

A second embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. Pressure holding device 40 of the present embodiment
Is composed of a main body member 41, a pressing mechanism 42, and a fixing nut 43 as fixing means. In addition, nozzle 2
Has an external thread portion 2a screwed with the fixing nut 43 on the outer peripheral surface of the distal end thereof.

The main body member 41 is formed in a tubular shape that can be inserted into the nozzle 2 along the axis P thereof. Body member 41
A flange 44 protruding toward the outer peripheral direction is integrally formed at an end located on the base end side 1a of the device 1. On the outer peripheral surface of the main body member 41, a plurality of the aforementioned angular rings 11 are provided along the axis P. In the illustrated example, five devices 1 are provided from the proximal end 1a to the distal end 1b.

The corner ring 11 located closest to the proximal end 1a is in contact with the flange 44, and the distal end 1b of the square ring 11 located closest to the distal end 1b is also located at the distal end 1b.
Is provided.

A drive shaft 45 extending from an end located on the distal side 1b of the main body member 41 to an end located on the proximal end 1a is provided inside the cylindrical main body member 41. Is provided.

The end 4 located on the base side 1a of the drive shaft 45
5a protrudes from the end of the main body member 41, and a thread groove 46 is formed on the outer peripheral surface thereof. An end portion 45b located on the distal end side 1b of the drive shaft 45 protrudes from the end portion of the main body member 41, and a pressing portion 47 having an enlarged diameter and slightly smaller than the inner diameter of the nozzle 2 is integrally formed at the distal end. It is provided in. The pressing portion 47 is a collar member 4 that does not elastically deform.
8, it comes into contact with the spacer 12 located at the most distal end side 1 b.

A drive nut 50 is screwed into a screw groove 46 provided at an end 45a of the drive shaft 45. The drive nut 50 is in contact with the base end surface 41a of the main body member 41 via a washer 49 or the like.

By rotating the drive nut 50 about the axis P of the nozzle 2, the drive shaft 45 can reciprocate along the arrow T in the drawing. The drive shaft 4
5 and the drive nut 50 constitute the pressing mechanism 42.

The fixing nut 43 is formed in a ring shape and has a female screw portion 51a which is screwed with the male screw portion 2a of the nozzle 2 on the inner surface of the end located at the distal end 1b.
1 and a first disk portion 52 connected to the proximal end 1a of the ring portion 51, and the female screw portion 51a of the ring portion 51 is integrally provided.
And a second disc portion 53 extending from the base end side 1a of the first disc.

The first disk portion 52 and the second disk portion 53 have holes 52a and 53a at substantially the center thereof, respectively, through which the main body member 41 can pass. The flange 44 of the member 41 is sandwiched.

When the fixing nut 43 is attached to the main body member 41, first, the ring portion 51 and the first disk portion 52 are placed on the flange 44 from the base end 1a of the device 1, and then the second The disk portion 53 is attached to the ring portion 51 by fixing it.

According to the configuration described above, the pressure holding device 40
Is inserted into the nozzle 2, and the female screw 51 a of the ring 51 of the fixing nut 43 is screwed into the male screw 2 a of the nozzle 2. And the fixing nut 43
The first circular plate portion 52 is connected to the flange 44 of the main body member 41.
Until the pressure holding device 40 is in close contact with the nozzle 2
Fixed to.

After fixing to the nozzle 2, the drive nut 50 is rotated about the axis P of the nozzle 2, and the drive shaft 45 is
To the base end side 1a. The pressing portion 47 provided at the tip of the drive shaft 45 is provided with a plurality of square rings 1.
1 is pressed along the axis T of the nozzle 2 along the arrow T2 in the drawing via the spacer 12 and the collar member 48, respectively.

The angular ring 11 is made of an elastic material such as rubber, and its inner peripheral surface is regulated by the main body member 41, so that it expands toward the outer peripheral direction of the main body member 41.
Then, the angular ring 11 comes into close contact with the inner surface of the nozzle 2 and the nozzle 2
Will be sealed. Thereafter, a withstand voltage test is performed.

After the pressure test is completed, the drive nut 5
0 is rotated to the opposite side to the above, so that the square ring 11
Then, the fixing nut 43 is rotated to the opposite side to the previous state, and the screw engagement with the nozzle 2 is released. Then, the device 40 is removed from the nozzle 2.

According to the present embodiment, the fixing nut 43
Can be easily fixed to and detached from the nozzle 2 only by operating. In addition, since the angular ring 11 comes into close contact with the inner surface of the nozzle 2 by rotating the drive nut 50,
The nozzle 2 can be easily sealed. Therefore, it is possible to reduce the number of steps required for the pressure test of the drum 3.

Since a plurality of the angular rings 11 are provided along the axis P of the nozzle 2, a pressurized fluid or the like used for the test is applied between the angular ring 11 and the nozzle 2 during the pressure test of the drum 3. There is no leakage.

Further, the angular ring 11 is made of an elastic body such as rubber and is pressed along the axis P of the nozzle 2 by the pressing portion 47 and the like, and tightly contacts the inner surface of the nozzle 2 to seal the nozzle 2. Therefore, the inner surface of the nozzle 2 has a surface roughness of, for example, 1
The nozzle 2 can be reliably sealed even if the processing intersection of the surface is not more than 00S and the surface is relatively coarsely formed to about ± 1.0 mm.

[0058]

According to the pressure holding device of the present invention, when the main body member is freely inserted into the nozzle, and when the main body member is inserted into the nozzle, the elastic member is moved in the axial direction of the nozzle by the pressing mechanism. When pressed, it expands in the outer peripheral direction of the main body member and comes into close contact with the inner surface of the nozzle. Further, since the locking mechanism is locked to the inner surface of the pressure vessel after the main body member is inserted, the main body member is securely fixed to the pressure vessel.

Therefore, the nozzle can be sealed easily and securely, and the nozzle can be easily fixed and removed from the nozzle.
The man-hour required for the pressure test of the pressure vessel can be suppressed.

[0060] Further, there is provided fixing means for providing a screw portion at the tip of the nozzle, and screwing with the screw portion of the nozzle to fix the main member to the pressure vessel when the main body member is inserted into the nozzle. In this case, the main body member is securely fixed to the pressure vessel.
Therefore, even in this case, the nozzle can be easily and securely sealed, and the nozzle can be easily fixed to and removed from the nozzle, and the number of steps required for the pressure test of the pressure vessel can be suppressed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a pressure holding device according to a first embodiment of the present invention.

FIG. 2 is a side view of the pressure holding device as viewed from a direction of an arrow ii shown in FIG. 1;

FIG. 3 is a sectional view of the locking mechanism of the pressure holding device, taken along line iii-iii shown in FIG. 2;

FIG. 4 is a longitudinal sectional view showing a state immediately after the pressure holding device shown in FIG. 1 is inserted into a nozzle.

FIG. 5 is a longitudinal sectional view of a pressure holding device according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Pressure holding device 2 ... Stub 2a ... Male thread part 3 ... Drum (pressure vessel) 4 ... Main body member 5 ... Pressing mechanism 6 ... Locking mechanism 11 ... Square ring (elastic member) 40 ... Pressure holding device 41 ... Main body member 42 pressing mechanism 43 fixing nut (fixing means) 51a female screw part

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[Procedure amendment]

[Submission date] October 2, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0048

[Correction method] Change

[Correction contents]

The fixing nut 43 is formed in a ring shape and has a female screw portion 51a which is screwed with the male screw portion 2a of the nozzle 2 on the inner surface of the end located at the distal end 1b.
1, the circular plate portion 52 connected to the proximal end side 1a of the ring portion 51
Bei Eteiru together the door.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0049

[Correction method] Change

[Correction contents]

[0049] Disk part 52 isThrough the main body member 41
Hole 52aWhile forming,BookBody member 41
Is sandwiched.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0050

[Correction method] Change

[Correction contents]

[0050] Incidentally, when mounting the fixing nut 43 to the body member 41 is first attached by turnip a ring portion 51 and the disc portion 52 from the base end side 1a of the apparatus 1 to the flange 44.

[Procedure amendment 4]

[Document name to be amended] Drawing

[Correction target item name] Fig. 5

[Correction method] Change

[Correction contents]

FIG. 5

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akihiro Kawaguchi 2-1-1 Shinama, Arai-machi, Takasago City, Hyogo Prefecture Inside Mitsubishi Heavy Industries, Ltd. Takasago Research Laboratories (72) Inventor Tetsuro Akamatsu 2-1-1, Arai-machi Niihama, Takasago City, Hyogo Prefecture No. 1 Inside the Takasago Research Laboratory, Mitsubishi Heavy Industries, Ltd. (72) Inventor Shoji Takagishi 1-1-1, Wadazakicho, Hyogo-ku, Kobe, Hyogo Prefecture Inside the Kobe Shipyard, Mitsubishi Heavy Industries, Ltd. (72) Inventor Yoshinori Okamura Kobe, Hyogo Prefecture 1-1-1 Wadazakicho, Hyogo-ku Mitsubishi Heavy Industries, Ltd. Kobe Shipyard

Claims (2)

[Claims] 1. A pressure holding device for a pressure-resistant test of a pressure vessel having a nozzle for connecting an external pipe, comprising: a main body member insertable into the nozzle; and an outer peripheral surface of the main body member. An elastic member, a pressing mechanism for pressing the elastic member along the axial direction of the nozzle, and the main member provided on the main member and inserted into the nozzle is locked to an inner surface of the pressure vessel. A locking mechanism that is fixed to the pressure vessel by the main body member being inserted into the nozzle and the locking mechanism being locked to an inner surface of the pressure vessel. A pressure holding device characterized in that the member is pressed in the axial direction of the nozzle, whereby the elastic member swells in the outer peripheral direction of the main body member and is in close contact with the inner surface of the nozzle to seal the nozzle. 2. A pressure holding device for a pressure resistance test of a pressure vessel provided with a nozzle having a threaded portion at a tip thereof, comprising: a main body member insertable into the nozzle; and an outer peripheral surface of the main body member. An elastic member, a pressing mechanism for pressing the elastic member along an axial direction of the nozzle, and a pressing mechanism provided in the main body member and inserted into the nozzle by screwing into a screw portion of the nozzle. Fixing means for fixing the main body member to the pressure vessel, wherein the main body member is inserted into the nozzle and the fixing means is fixed to the pressure vessel by screwing into a screw portion of the nozzle. Wherein the pressing mechanism presses the elastic member in the axial direction of the nozzle, whereby the elastic member swells in the outer peripheral direction of the main body member and adheres to the inner surface of the nozzle to seal the nozzle. Pressure holding device.