JP3372521B2 - Piping penetration defect detection device - Google Patents
Piping penetration defect detection deviceInfo
- Publication number
- JP3372521B2 JP3372521B2 JP2000015902A JP2000015902A JP3372521B2 JP 3372521 B2 JP3372521 B2 JP 3372521B2 JP 2000015902 A JP2000015902 A JP 2000015902A JP 2000015902 A JP2000015902 A JP 2000015902A JP 3372521 B2 JP3372521 B2 JP 3372521B2
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- pressure
- seal
- inner peripheral
- elastic rubber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Examining Or Testing Airtightness (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、配管の貫通欠陥の
有無と同貫通欠陥が生じている場所との検知を併せて行
う配管の貫通欠陥検知装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention simultaneously detects the presence or absence of a penetration defect in a pipe and the place where the penetration defect occurs.
Cormorant about through defect detection apparatus piping.
【０００２】[0002]
【従来の技術】配管には、洩れの原因となる貫通欠陥が
生じていることがある。2. Description of the Related Art Piping sometimes has a penetrating defect that causes leakage.
【０００３】そこで、配管では貫通欠陥の有無の検知を
行っている。Therefore, the presence or absence of a penetration defect is detected in the pipe.
【０００４】従来では、配管の貫通欠陥の有無を確かめ
るために、配管に欠陥部が在るとの疑いがあるときは、
検査しようとする配管の入口／出口を密封し、この密封
された配管の内部に所定の圧力流体、例えば所定圧の空
気を充填し、その後の空気圧の変動を圧力計などの計測
具で計測することによって、配管全体の洩れの有無を検
知していた。Conventionally, in order to confirm the presence or absence of a penetration defect in a pipe, when it is suspected that there is a defective portion in the pipe,
The inlet / outlet of the pipe to be inspected is sealed, the inside of the sealed pipe is filled with a predetermined pressure fluid, for example, air of a predetermined pressure, and the fluctuation of the air pressure after that is measured by a measuring tool such as a pressure gauge. By doing so, the presence or absence of leakage in the entire pipe was detected.
【０００５】[0005]
【発明が解決しようとする課題】ところが、こうした貫
通欠陥の検知は、配管全体の洩れの有無の判別だけであ
り、その洩れが起きている配管の部位（場所）までの特
定は難しい。However, such a penetration defect is detected only by determining whether or not there is a leak in the entire pipe, and it is difficult to identify the portion (location) of the pipe where the leak has occurred.
【０００６】しかも、密封する領域が配管全体に渡るた
めに密封容積は過大となり、特に圧力降下の速度が遅い
微少欠陥の場合、検出に長時間を要するといった問題が
ある。Moreover, since the area to be sealed extends over the entire pipe, the sealed volume becomes excessively large, and particularly in the case of a minute defect having a slow pressure drop rate, there is a problem that it takes a long time to detect.
【０００７】そのうえ、この検出する時間の間に温度変
化や大気圧力の変化が起こるために、これら温度，大気
圧力の変化による影響を補正する必要があり、検出精度
が悪くなる難点もあった。In addition, since the temperature change and the atmospheric pressure change occur during the detection time, it is necessary to correct the influence of these changes in the temperature and the atmospheric pressure, which causes a problem that the detection accuracy is deteriorated.
【０００８】このため、これらの点を改善した技術が要
望されている。Therefore, there is a demand for a technique which improves these points.
【０００９】本発明は上記事情に着目してなされたもの
で、その目的とするところは、短時間の計測時間、かつ
高い精度で、配管の貫通欠陥の有無をその貫通欠陥の場
所の特定と併せて検知することができる配管の貫通欠陥
検知装置を提供することにある。The present invention has been made in view of the above circumstances, and its purpose is to identify the presence or absence of a penetrating defect in a pipe with a short measuring time and with high accuracy. it is to provide a through defect detection device of piping that can have be detected together.
【００１０】[0010]
【課題を解決するための手段】上記目的を達成するため
に請求項１に記載の配管の貫通欠陥検知装置は、配管内
に挿入される、該配管軸方向に所定の間隔で、圧力流体
を受けると該配管の内周面に向かい拡張する複数の拡張
部材を配置して構成されるシール機構と、各拡張部材に
該拡張部材が配管の内周面と接するまで拡張するように
圧力流体を供給し、配管内を配管軸方向に区切るシール
壁を形成する圧力流体供給手段と、圧力流体を配管外か
ら、シール壁で区切られた配管内のシール空間の近傍に
配置した逆止弁部を通じて、シール空間へ供給し該シー
ル空間を所定圧に加圧する加圧機構と、シール空間の圧
力を検知する圧力センサと、この圧力センサの出力変化
から前記配管の貫通欠陥の有無を判定する判定手段と有
し構成して、配管の貫通欠陥の検知を、配管全体ではな
く、小容量の密封空間ですむ配管の各部分で行えるよう
にしたことにある。In order to achieve the above object, a pipe penetration defect detecting device according to a first aspect of the present invention is provided with a pressure fluid which is inserted into the pipe at predetermined intervals in the axial direction of the pipe.
When expanded, it expands toward the inner surface of the pipe.
A sealing mechanism configured by arranging members and each expansion member
So that the expansion member expands until it contacts the inner peripheral surface of the pipe
Seal that supplies pressurized fluid and divides the inside of the pipe in the axial direction of the pipe
The pressure fluid supply means that forms the wall and whether the pressure fluid is
Close to the seal space inside the pipe separated by the seal wall.
Through the non-return valve that is arranged, supply to the seal space and
Pressurizing mechanism to pressurize the seal space to a predetermined pressure and the pressure of the seal space.
Pressure sensor that detects force and output change of this pressure sensor
From the above, there is a judging means for judging the presence or absence of a penetration defect in the pipe.
In this configuration, it is possible to detect the penetration defect of the pipe not in the entire pipe but in each part of the pipe that requires a small sealed space.
【００１１】請求項２に記載の配管の貫通欠陥検知装置
は、さらに拡張部材で形成されるシール壁のシール性を
向上させるために、拡張部材を、配管の内周面と接する
表面部分が周方向に渡り形成され、該表面部分には該配
管の内周方向に渡り環状の突起状部が形成された弾性ゴ
ム膜から構成したことにある。According to a second aspect of the present invention, there is provided a penetration defect detecting device for a pipe, in which the sealing property of the seal wall formed by the expansion member is further improved.
The expansion member contacts the inner peripheral surface of the pipe for improvement.
The surface portion is formed in the circumferential direction, and the surface portion is
An elastic rubber with an annular protrusion formed along the inner circumference of the pipe.
It consists of a membrane .
【００１２】[0012]
【００１３】[0013]
【発明の実施の形態】以下、本発明を図１ないし図３に
示す一実施形態にもとづいて説明する。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on an embodiment shown in FIGS.
【００１４】図１は、本発明方法を適用した貫通欠陥検
知装置の全体を示し、図中１は検査しようとする配管Ａ
内に挿入自在な細径のプローブを示す。FIG. 1 shows the entire penetration defect detecting apparatus to which the method of the present invention is applied. In the figure, 1 is a pipe A to be inspected.
A small diameter probe that can be inserted inside is shown.
【００１５】プローブ１は、センサ／弁収納部２の先端
側に、シール／検査圧封入部３、挿入ヘッド部４を順に
接続して構成される。またセンサ／弁収納部２の基端側
は、接続コネクタ部５を介して、外周に気体の搬送をな
すフロート部８を有する搬送ケーブル部６に接続してあ
る。The probe 1 is constructed by connecting a seal / inspection pressure enclosing section 3 and an insertion head section 4 in this order to the tip side of the sensor / valve housing section 2. Further, the base end side of the sensor / valve housing 2 is connected via a connector 5 to a carrier cable 6 having a float 8 for carrying gas on the outer circumference.
【００１６】プローブ１および搬送ケーブル部６は、配
管Ａ外に設置される挿入装置７により繰り出されるよう
になっていて、例えば配管Ａの入口へプローブ端から挿
入して、検査しようとする配管Ａの場所へ、プローブ１
の特定部位、すなわちシール／検査圧封入部３を導ける
ようにしている。The probe 1 and the carrier cable section 6 are drawn out by an insertion device 7 installed outside the pipe A. For example, the probe A is inserted into the inlet of the pipe A from the probe end, and the pipe A to be inspected. To the place of probe 1
The specific portion, that is, the seal / inspection pressure enclosing portion 3 can be guided.
【００１７】そして、シール／検査圧封入部３には、配
管Ａの内部を所定の小区間に区切るシール機構１０が取
り付けられている。The seal / inspection pressure enclosing section 3 is provided with a seal mechanism 10 which divides the inside of the pipe A into predetermined small sections.
【００１８】図２にはこのシール機構１０の構造が示さ
れている。FIG. 2 shows the structure of the sealing mechanism 10.
【００１９】シール機構１０には、配管Ａの配管軸方向
となるプローブ１の軸方向に所定の間隔を置いて、複数
の拡張部材、例えば配管Ａの内径より小さい一対（２
個）の拡張／収縮が可能な短筒形の弾性ゴム膜１２ａ，
１２ｂを横向きに設けて、配管Ａ内での移動を可能とす
る構造が用いられている。The seal mechanism 10 has a plurality of expansion members, for example, a pair (2 smaller than the inner diameter of the pipe A, with a predetermined interval in the axial direction of the probe 1 which is the pipe axial direction of the pipe A.
Short tubular elastic rubber film 12a capable of expanding / contracting
A structure is provided in which 12b is provided laterally so as to be movable in the pipe A.
【００２０】すなわち、プローブ１の先端側の近くに設
けた弾性ゴム膜１２ａの内部には、導出孔２１（拡張圧
導出孔）が形成してあるサポートリング１３が嵌挿して
ある。サポートリング１３は、外周面を除く各部が接着
（ゴム膜成形時に一体に接着）されていて、短筒形の弾
性ゴム膜１２ａのシールの保持をなしている。That is, a support ring 13 having a lead-out hole 21 (extended pressure lead-out hole) is fitted inside the elastic rubber film 12a provided near the tip side of the probe 1. Each part of the support ring 13 except the outer peripheral surface is adhered (integrally adhered at the time of molding the rubber film), and holds the seal of the short tubular elastic rubber film 12a.
【００２１】この弾性ゴム膜１２ａが付いたサポートリ
ング１３が、挿入ヘッド部４と直列につながる鍔１５ａ
付き短柱形状の保持金具１５（保持部材）の外周部に嵌
挿され、同金具端にねじ込まれた例えばナット形の締結
具１６で両端側から挟持固定してある。The support ring 13 provided with the elastic rubber film 12a is connected to the insertion head portion 4 in series with the collar 15a.
It is fitted and inserted into the outer peripheral part of the holding metal fitting 15 (holding member) in the shape of a short column with a pin, and is clamped and fixed from both ends by, for example, a nut-shaped fastener 16 screwed into the end of the metal fitting.
【００２２】またプローブ１の先端側から遠くに設けた
弾性ゴム膜１２ｂの内部にも、同様に導出孔２３（拡張
圧導出孔）が形成してあるサポートリング１７が接着固
定してある。そして、サポートリング１７は、弾性ゴム
膜１２ａのときと同様、センサ／弁収納部２と直列につ
ながる鍔１８ａ付き短柱形状の保持金具１８（保持部
材）の外周部に嵌挿され、同金具端にねじ込まれた例え
ばナット形の締結具１９で両端側から挟持固定してあ
る。Further, a support ring 17 in which a lead-out hole 23 (extended pressure lead-out hole) is similarly formed is also adhered and fixed inside the elastic rubber film 12b provided far from the tip side of the probe 1. The support ring 17 is, like the elastic rubber membrane 12a, fitted and fitted on the outer peripheral portion of a short columnar holding metal fitting 18 (holding member) with a collar 18a connected in series with the sensor / valve housing 2. For example, nut-shaped fasteners 19 screwed into the ends are clamped and fixed from both ends.
【００２３】そして、向き合う保持金具１５，１８同士
がフレキシブル性を有する空圧チューブ２０を介して接
続され、双方の弾性ゴム膜１２ａ，１２ｂを比較的小ス
パン（例えば約１００mm〜１５０mm）の間隔で、プロー
ブ１に保持させている。The holding metal fittings 15 and 18 facing each other are connected to each other via a pneumatic tube 20 having flexibility, and the elastic rubber membranes 12a and 12b of both are arranged at intervals of a relatively small span (for example, about 100 mm to 150 mm). , The probe 1 holds it.
【００２４】具体的には、保持金具１８側に向く保持金
具１５の側部には、弾性ゴム膜１２ａの内面に臨む導出
孔２１と連通する導入孔２２（拡張圧導入孔）が形成し
てあり、保持金具１５側に向く保持金具１８の側部に
は、弾性ゴム膜１２ｂの内面に臨む導出孔２３と連通す
る中継孔２４が形成してある。そして、導入孔２２に空
圧チューブ２０の先端部が接続され、中継孔２４に空圧
チューブ２０の後端部が接続され、両保持金具１５，１
８を所定の間隔で連通自在に連結してある。Specifically, an introduction hole 22 (expansion pressure introduction hole) communicating with a lead-out hole 21 facing the inner surface of the elastic rubber film 12a is formed on a side portion of the holding metal fitting 15 facing the holding metal fitting 18 side. A relay hole 24 communicating with the lead-out hole 23 facing the inner surface of the elastic rubber film 12b is formed on the side of the holding metal fitting 18 facing the holding metal fitting 15 side. Then, the leading end of the pneumatic tube 20 is connected to the introduction hole 22, and the rear end of the pneumatic tube 20 is connected to the relay hole 24.
8 are connected so that they can communicate with each other at a predetermined interval.
【００２５】導出孔２３は、保持金具１８に形成された
導入孔２５（拡張圧導入孔）、さらに同導入孔２５に接
続されたフレキシブル性を有する空圧チューブ２６を用
いて、センサ／弁収納部２、接続コネクタ部５、搬送ケ
ーブル部６を通じ、圧力流体供給手段、例えば挿入装置
７に内蔵されたガス圧供給部２８（例えばガス圧又は液
圧を供給するもので、本実施形態ではガス圧、例えば空
気圧を供給する機構で構成されるもの）に接続されてい
る。The lead-out hole 23 uses a lead-in hole 25 (expansion pressure lead-in hole) formed in the holding metal fitting 18, and a flexible pneumatic tube 26 connected to the lead-in hole 25 to store the sensor / valve. Through the portion 2, the connection connector portion 5, and the transport cable portion 6, a pressure fluid supply means, for example, a gas pressure supply portion 28 incorporated in the insertion device 7 (for example, gas pressure or liquid pressure is supplied. Pressure (for example, a mechanism configured to supply air pressure).
【００２６】さらに例えば同挿入装置７には、ガス圧供
給部２８からの圧力空気を空圧チューブ２６へ切り換え
る機能を有する操作部２９が内蔵されていて、操作部２
９の操作によってガス圧供給部２８から各導出孔２１，
２３へ圧力流体、例えば所定の圧力空気を供給できるよ
うにしてある。Further, for example, the insertion device 7 has a built-in operation part 29 having a function of switching the pressure air from the gas pressure supply part 28 to the pneumatic tube 26.
From the gas pressure supply unit 28, the respective outlet holes 21,
A pressure fluid, for example, a predetermined pressure air can be supplied to 23.
【００２７】また操作部２９には、例えば空圧チューブ
２６からの空気を大気放出させる側に切り換える機能も
有していて、操作部２９の操作で、各弾性ゴム膜１２
ａ，１２ｂに拡張圧を与えると、図２中の破線で示され
るように各弾性ゴム膜１２ａ，１２ｂの環状の表面部分
を配管Ａの内周面と接するまで拡張させ、拡張圧を大気
に排気すると、図２中の実線で示されるようにゴム弾性
により収縮させるようにしてある。The operating portion 29 also has a function of switching the air from the pneumatic tube 26 to the side for releasing the air into the atmosphere, and by operating the operating portion 29, each elastic rubber film 12 can be operated.
When an expansion pressure is applied to a and 12b, the annular surface portions of the elastic rubber films 12a and 12b are expanded until they come into contact with the inner peripheral surface of the pipe A as shown by the broken line in FIG. When exhausted, it is made to contract by rubber elasticity as shown by the solid line in FIG.
【００２８】これにより、配管Ａの任意の場所にシール
／検査圧封入部３を挿入配置した後、各弾性ゴム膜１２
ａ、１２ｂに拡張圧を与えることにより、該シール／検
査圧封入部３の在る地点に、シール壁、具体的には配管
Ａの内部を配管軸方向に区切るシール壁α，βが形成さ
れるようにしている。As a result, after the seal / inspection pressure enclosing portion 3 is inserted and arranged at an arbitrary position in the pipe A, each elastic rubber film 12 is inserted.
By applying expansion pressure to a and 12b, seal walls, specifically, seal walls α and β that divide the inside of the pipe A in the pipe axial direction are formed at the point where the seal / inspection pressure enclosing portion 3 exists. I am trying to do it.
【００２９】また各弾性ゴム膜１２ａ，１２ｂの配管Ａ
の内周面と接する環状の表面部分には、例えば図３（弾
性ゴム膜１２ａ側だけ図示）に示されるように配管Ａの
内周方向に沿う周方向全体に渡り環状の突条３０（突起
状部）が複数条、例えば３条、並行に形成されていて、
高い接触面圧で、配管Ａの内周面にシール壁α，βを接
触させるようにしてある（高いシール性を確保するた
め）。Further, the piping A of each elastic rubber film 12a, 12b
As shown in FIG. 3 (only the elastic rubber film 12a side is shown), for example, on the annular surface portion in contact with the inner peripheral surface of the pipe A, the annular protrusion 30 (protrusion) is formed over the entire circumferential direction along the inner peripheral direction of the pipe A. Shaped part) is formed in a plurality of lines, for example, three lines in parallel,
The seal walls α and β are brought into contact with the inner peripheral surface of the pipe A with a high contact surface pressure (to ensure high sealability).
【００３０】一方、保持金具１８には、例えば図２中の
破線で示されるようにセンサ／弁収納部２側の側部に入
口３１ａが開口し、保持金具１５側の側部に出口３１ｂ
が開口する充填圧供給孔３１が前後方向に貫通して形成
されている。On the other hand, in the holding metal fitting 18, for example, as shown by a broken line in FIG. 2, an inlet 31a is opened on the side portion on the sensor / valve housing 2 side and an outlet 31b is opened on the side material on the holding metal fitting 15 side.
A filling pressure supply hole 31 that opens is formed so as to penetrate in the front-rear direction.
【００３１】この充填圧供給孔３１は、入口１８ａに接
続されたフレキシブル性を有する空圧チューブ３２、セ
ンサ／弁収納部２内に収納された逆止弁部２ａ、接続コ
ネクタ部５、搬送ケーブル部６を経て、加圧機構として
の例えば上記挿入装置７に内蔵されているガス圧供給部
２８に接続されている。The filling pressure supply hole 31 has a flexible pneumatic tube 32 connected to the inlet 18a, a check valve portion 2a housed in the sensor / valve housing portion 2, a connection connector portion 5, and a carrier cable. It is connected via a part 6 to a gas pressure supply part 28, which is incorporated in the above-mentioned insertion device 7 as a pressurizing mechanism.
【００３２】これにより、ガス圧供給部２８から充填圧
供給孔３１へ向け、所定圧の流体、例えば所定圧の圧力
空気を供給することにより、逆止弁部２ａの逆流防止機
能を利用して、図２中の破線で示すシール壁α，βで小
区間に区切られた配管Ａの密封空間３３（シール空間）
に所定の検査圧を封入できるようにしている（充填）。
つまり、シール壁α，βで区切られた密封空間３３を加
圧できるようにしてある。As a result, by supplying a fluid of a predetermined pressure, for example, pressurized air of a predetermined pressure, from the gas pressure supply section 28 to the filling pressure supply hole 31, the check valve section 2a is utilized for the backflow prevention function. , A sealed space 33 (seal space) of the pipe A divided into small sections by the seal walls α and β shown by broken lines in FIG.
The specified inspection pressure can be filled in (filling).
That is, the sealed space 33 divided by the seal walls α and β can be pressurized.
【００３３】なお、挿入装置７に内蔵されている操作部
２９には、弾性ゴム膜１２ａ，１２ｂを拡張させたり収
縮させたりする機能以外に、例えば充填孔供給孔３１へ
の圧力空気を供給操作する機能も設定されていて、図２
中の破線で示すシール壁α，βを形成した後、配管Ａの
密封空間３３（シール空間）に検査圧を封入（加圧）で
きるようにしてある。In addition to the function of expanding and contracting the elastic rubber films 12a and 12b, for example, the operation unit 29 built in the insertion device 7 is operated to supply pressurized air to the filling hole supply hole 31. The function to do is also set,
After forming the seal walls α and β shown by the broken lines, the inspection pressure can be enclosed (pressurized) in the sealed space 33 (seal space) of the pipe A.
【００３４】他方、センサ／弁収納部２側に向く保持金
具１８の側部（センサ／弁収納部２をなす部分）には圧
力センサ３４が設置されている。また保持金具１８の内
部には、一端部が保持金具１５側の側部に開口し、他端
部が圧力センサ３４の受圧部に臨む通路３５（圧力セン
サ取付孔を兼ねる）が貫通していて、密封空間３３での
密封圧力を圧力センサ３４へ導けるようにしている。On the other hand, a pressure sensor 34 is installed on the side of the holding metal fitting 18 facing the sensor / valve housing 2 side (the portion forming the sensor / valve housing 2). Further, a passage 35 (which also serves as a pressure sensor mounting hole) is opened through the inside of the holding metal fitting 18 so that one end thereof opens to a side portion on the holding metal fitting 15 side and the other end faces a pressure receiving portion of the pressure sensor 34. The sealing pressure in the sealed space 33 can be guided to the pressure sensor 34.
【００３５】つまり、圧力センサ３４にて、密封空間３
３の内部充填圧を検知できるようにしてある。That is, in the pressure sensor 34, the sealed space 3
The internal filling pressure of No. 3 can be detected.
【００３６】また圧力センサ３４は、センサ／弁収納部
２、接続コネクタ部５、搬送ケーブル部６、さらに同搬
送ケーブル部６の端部のコネクタ６ａを介して、例えば
配管Ａ外に設置される欠陥判定部３６に接続されてい
る。The pressure sensor 34 is installed, for example, outside the pipe A via the sensor / valve housing 2, the connector 5, the transport cable 6, and the connector 6a at the end of the transport cable 6. It is connected to the defect determination unit 36.
【００３７】欠陥判定部３６は、加圧された密封空間３
３の圧力低下（降下）の割合、具体的には密封空間３３
における一定時間放置後の圧力低下（降下）率を圧力セ
ンサ３４の出力から読み取り、貫通欠陥の有無を判定す
る機能を有している。The defect determining section 36 is provided in the pressurized sealed space 3
The rate of pressure drop (drop) of 3, specifically the sealed space 33
It has a function of reading the output of the pressure sensor 34 for the rate of pressure drop (fall) after being left for a certain period of time and determining the presence or absence of a penetration defect.
【００３８】つまり、圧力センサ３４の出力変化から、
密封空間３３を形成した配管Ａの場所における貫通欠陥
の有無を検出できるようにしている。That is, from the output change of the pressure sensor 34,
The presence or absence of a penetration defect at the location of the pipe A in which the sealed space 33 is formed can be detected.
【００３９】なお、保持金具１５と保持金具１８との間
は、空圧チューブ２０における応力負担を軽減、具体的
には充填圧充填時の伸びの防止，プローブ挿入時および
引抜時の負荷受部材としての役割を果たすフレキシブル
性を有する接続チューブ３７で接続して、プローブ１の
外郭としてある。但し、接続チューブ３７は、通路３５
の入口、充填圧供給孔３１の出口３１ｂを避けて接続し
てあり、充填圧の供給、密封空間３３の圧力検知は損な
わない。Between the holding metal fittings 15 and 18, the stress load on the pneumatic tube 20 is reduced, specifically, the expansion at the time of filling pressure filling is prevented, and the load receiving member at the time of probe insertion and withdrawal. It is connected as a flexible tube to the outer periphery of the probe 1. However, the connection tube 37 is connected to the passage 35.
Is connected to avoid the inlet and the outlet 31b of the filling pressure supply hole 31, and the supply of the filling pressure and the detection of the pressure in the sealed space 33 are not impaired.
【００４０】また逆止弁部２ａの外周は、例えばセンサ
／弁収納部２の外郭（プローブ１の外郭）をなす、シー
ル／検査圧封入部３と接続コネクタ部５とに渡り接続し
た保護チューブ３８に取り付けられていて、プローブ挿
入時および引抜時の際の摺動による逆止弁部２ａの損傷
を防ぐようにしてある。The outer circumference of the check valve portion 2a is, for example, a protective tube connected to the seal / inspection pressure enclosing portion 3 and the connecting connector portion 5 which form the outer portion of the sensor / valve housing portion 2 (outer portion of the probe 1). The check valve portion 2a is attached to the check valve 38 so as to prevent the check valve portion 2a from being damaged by sliding during insertion and extraction of the probe.
【００４１】こうした貫通欠陥検知装置にて、短時間の
計測時間でかつ高い精度で、配管Ａの貫通欠陥の有無
と、貫通欠陥の場所の特定とが行えるようにしている。With such a penetrating defect detecting device, the presence or absence of a penetrating defect in the pipe A and the location of the penetrating defect can be specified with high accuracy in a short measuring time.
【００４２】すなわち、本発明の検知方法を貫通欠陥検
知装置の作用（検査手順）にしたがい説明すれば、今、
配管Ａの漏洩の有無を検査を行うとする。That is, the detection method of the present invention will be described according to the operation (inspection procedure) of the penetrating defect detection device.
It is assumed that the pipe A is inspected for leakage.
【００４３】このときには、まず、例えば配管Ａの入
口，出口といった開口の付近に挿入装置７を据え付け、
この挿入装置７を用いて、プローブ１を先端側、すなわ
ち挿入ヘッド部４から配管Ａ内へ挿入させる。At this time, first, the insertion device 7 is installed near the opening such as the inlet and outlet of the pipe A,
Using this insertion device 7, the probe 1 is inserted into the pipe A from the tip side, that is, from the insertion head portion 4.
【００４４】この挿入は、検査しようとする配管部分に
相当する地点にシール／検査圧封入部３が到達するまで
行われる。This insertion is carried out until the seal / inspection pressure sealing portion 3 reaches a point corresponding to the pipe portion to be inspected.
【００４５】規定位置に達すると、プローブ１の挿入を
止めて固定する。When the specified position is reached, the insertion of the probe 1 is stopped and fixed.
【００４６】これにより、検査しようとする配管部分の
内部に、配管軸方向に並ぶ一対の弾性ゴム膜１２ａ，１
２ｂが位置決められる。As a result, a pair of elastic rubber films 12a, 1a arranged in the pipe axial direction are provided inside the pipe portion to be inspected.
2b is positioned.
【００４７】この後、操作部２９の操作で、ガス圧供給
部２８から空圧チューブ２６に向け、圧力流体、例えば
所定圧の空気を供給する。Thereafter, by operating the operation unit 29, a pressure fluid, for example, air of a predetermined pressure is supplied from the gas pressure supply unit 28 toward the pneumatic tube 26.
【００４８】すると、ガス圧供給部２８からの圧力流体
が、各保持金具１５，１８を通じて、各サポートリング
１３，１７の導出孔２１，２３へ導かれる。Then, the pressure fluid from the gas pressure supply unit 28 is guided to the outlet holes 21 and 23 of the support rings 13 and 17 through the holding fittings 15 and 18, respectively.
【００４９】これにより、各弾性ゴム膜１２ａ，１２ｂ
には、該ゴム膜１２ａ，１２ｂを拡張させようとする拡
張圧が加わる。As a result, each elastic rubber film 12a, 12b
Is applied with an expansion pressure to expand the rubber films 12a and 12b.
【００５０】すると、各弾性ゴム膜１２ａ，１２ｂは、
図２中の破線で示されるように配管Ａの内周面に向けて
膨出、すなわち拡張していく。Then, the elastic rubber films 12a and 12b are
As shown by the broken line in FIG. 2, the pipe A bulges, that is, expands toward the inner peripheral surface.
【００５１】径方向外側へ向け張り出るように拡張する
各弾性ゴム膜１２ａ，１２ｂの外周面は、配管Ａの内面
全周と密着してシールをなし、配管Ａの内腔を仕切るシ
ール壁α，βを形成していく。The outer peripheral surfaces of the elastic rubber films 12a and 12b, which expand so as to project outward in the radial direction, are in close contact with the entire inner surface of the pipe A to form a seal, and a seal wall α for partitioning the inner cavity of the pipe A is formed. , Β are formed.
【００５２】すると、配管Ａの内部は、図２中の破線で
示されるように所定の間隔で並ぶシール壁α，βによっ
て配管軸方向に区切られ、当該地点に密封空間３３を形
成していく。Then, the inside of the pipe A is partitioned in the pipe axial direction by the seal walls α and β arranged at a predetermined interval as shown by the broken line in FIG. 2, and the sealed space 33 is formed at the point. .
【００５３】ここで、各弾性ゴム膜１２ａ，１２ｂは配
管Ａの内周面の形状に追従する弾性ゴムで形成されてい
る上、配管Ａの内周面と接する表面部分には高い面圧で
配管Ａの内周面と接触させる突条３０が形成してあるか
ら、高い気密性を有する密封空間３３が形成される。Here, each of the elastic rubber films 12a and 12b is formed of an elastic rubber that follows the shape of the inner peripheral surface of the pipe A, and a high surface pressure is applied to the surface portion in contact with the inner peripheral surface of the pipe A. Since the protrusions 30 that come into contact with the inner peripheral surface of the pipe A are formed, a sealed space 33 having high airtightness is formed.
【００５４】この後、操作部２９の操作で、ガス圧供給
部２８から空圧チューブ３２に向けて、圧力流体、例え
ば所定圧の空気を供給する。Thereafter, by operating the operation unit 29, a pressure fluid, for example, air of a predetermined pressure is supplied from the gas pressure supply unit 28 toward the pneumatic tube 32.
【００５５】すると、ガス圧供給部２８からの圧力流体
が、逆止弁部２ａを通じて、保持金具１８に形成されて
いる充填圧供給孔３１から密封空間３３へ充填され、密
閉空間３３を加圧していく。Then, the pressure fluid from the gas pressure supply unit 28 is filled into the sealed space 33 from the filling pressure supply hole 31 formed in the holding metal fitting 18 through the check valve unit 2a to pressurize the sealed space 33. To go.
【００５６】ここで、弾性ゴム膜１２ａ，１２ｂの外周
部は、円周上の数ケ所に形成した環状の突条３０により
著しく高い接触面圧で配管Ａの内周面と密着して高いシ
ール性をもたらしているから、弾性ゴム膜１２ａ，１２
ｂの外周部とそれに接する配管Ａの内周面との間からの
圧力流体の洩れは防止される。Here, the outer peripheral portions of the elastic rubber films 12a and 12b are in close contact with the inner peripheral surface of the pipe A with a remarkably high contact surface pressure by a ring-shaped ridge 30 formed at several places on the circumference to form a high seal. The elastic rubber films 12a, 12
Leakage of the pressure fluid from between the outer peripheral portion of b and the inner peripheral surface of the pipe A in contact with it is prevented.
【００５７】なお、密封空間３３に充填された圧力は、
逆止弁部２ａの逆流防止作用により、逆流することはな
い。The pressure filled in the sealed space 33 is
The check valve portion 2a prevents the check valve portion 2a from backflowing.
【００５８】この充填を終えたら、欠陥判定部３６によ
って、圧力センサ３４の出力から密封空間３３の内部の
充填圧の変化を計測する。具体的には、一定時間放置後
の圧力低下（降下）率を検出していく。After this filling is completed, the defect determining section 36 measures the change in the filling pressure inside the sealed space 33 from the output of the pressure sensor 34. Specifically, the rate of pressure decrease (fall) after leaving for a certain period of time is detected.
【００５９】この圧力低下（降下）率の具合から、配管
Ａの当位置（弾性ゴム膜１２ａ，１２ｂが位置決められ
た区間）での貫通欠陥の有無が検出される。The presence or absence of a penetration defect at this position of the pipe A (the section where the elastic rubber films 12a and 12b are positioned) is detected from the degree of this pressure drop (fall) rate.
【００６０】この位置での検査を終えたら、操作部２９
の操作で、弾性ゴム膜１２ａ，１２ｂに加わっている圧
力を大気に逃がして、弾性ゴム膜１２ａ，１２ｂを元の
状態に戻した後、プローブ１を挿入方向あるいは引抜方
向を移動させて、配管Ａの軸方向の任意の他の場所に位
置決め、この位置で再び弾性ゴム膜１２ａ，１２ｂの拡
張、充填圧の供給を用いた密封空間３３の圧力降下の検
出を行えば、この検査しようとする配管Ａの領域での漏
洩検査が行える。When the inspection at this position is completed, the operation unit 29
Operation, the pressure applied to the elastic rubber films 12a and 12b is released to the atmosphere, the elastic rubber films 12a and 12b are returned to the original state, and then the probe 1 is moved in the insertion direction or the withdrawal direction to If the positioning is performed at any other position in the axial direction of A, the elastic rubber films 12a and 12b are expanded again at this position, and the pressure drop in the sealed space 33 is detected by using the supply of the filling pressure, this inspection is attempted. Leakage inspection in the area of the pipe A can be performed.
【００６１】こうした検査を繰り返して、配管Ａの漏洩
を検査していく。The above inspection is repeated to inspect the pipe A for leakage.
【００６２】このように配管Ａの貫通欠陥の検知を、配
管全体でなく、配管Ａの各部分で行う方法および装置だ
と、配管Ａの貫通欠陥の検出はもちろん、漏洩場所の特
定もできる。As described above, the method and apparatus for detecting the penetration defect of the pipe A not in the entire pipe but in each part of the pipe A enables not only the detection of the penetration defect in the pipe A but also the location of the leak.
【００６３】しかも、シール壁α，βで区切られた密封
空間３３は、小容積（小容量）であるので、圧力降下の
速度が遅い微少欠陥でも、短時間の計測時間で、貫通欠
陥を検出できる。Moreover, since the sealed space 33 partitioned by the seal walls α and β has a small volume (small volume), even a small defect with a slow pressure drop speed can detect a penetrating defect in a short measurement time. it can.
【００６４】そのうえ、計測時間が短くてすむので、計
測時間の間における温度の変化，大気圧の変化の影響を
減少させることができ、検出精度を格段に向上させるこ
とができる。Moreover, since the measuring time is short, the influence of temperature change and atmospheric pressure change during the measuring time can be reduced, and the detection accuracy can be remarkably improved.
【００６５】特に、突条３０を有する配管内面にならう
特性に優れた弾性ゴム膜１２ａ，１２ｂを用いてシール
壁α，βのシール性を高める工夫、さらに密閉空間３３
の近傍に逆流防止の逆止弁部２ａを配置したり、密閉空
間３３の近傍に圧力センサ３４を配置して、密封空間３
３の容量が増加するのを抑制する構造、すなわち密封空
間３３の容量を減少させる工夫により、こうした短時間
での計測、高精度の漏洩検知が実現されるものである。In particular, by using elastic rubber films 12a and 12b having excellent characteristics that follow the inner surface of the pipe having the protrusions 30, the sealing property of the seal walls α and β is improved, and the sealed space 33 is further provided.
The check valve portion 2a for preventing backflow and the pressure sensor 34 in the vicinity of the sealed space 33.
With the structure for suppressing the increase in the capacity of No. 3, that is, the device for reducing the capacity of the sealed space 33, such measurement in a short time and highly accurate leak detection can be realized.
【００６６】試験の結果によると、従来の配管全体を加
圧して圧力降下を検出する検査方法では約４０時間の計
測時間を必要としているのを、本発明の配管Ａの漏洩を
検査する方法（装置）だと、１ケ所、約１５〜３０分の
計測で漏洩の有無の判別が行え、短時間での検査が実現
されることが確認された。しかも、検出精度は、板厚３
mmにもうけた約１０μｍの穴の検出が可能で、高い検出
精度が得られることも確認された。According to the test results, the conventional inspection method for pressurizing the entire pipe to detect the pressure drop requires a measurement time of about 40 hours, but the method for inspecting the leakage of the pipe A of the present invention ( It was confirmed that the presence of leakage can be discriminated by measuring about 15 to 30 minutes at one place, and an inspection can be realized in a short time. Moreover, the detection accuracy is 3 plate thickness.
It was also confirmed that a hole of about 10 μm in mm can be detected and high detection accuracy can be obtained.
【００６７】なお、一実施形態では流体圧力としてガス
圧を用いた例を挙げたが、これに限らず、液圧を用いて
もよい。つまり、液圧を用いた圧力流体供給手段、加圧
機構を採用しても構わない。In the embodiment, the gas pressure is used as the fluid pressure, but the fluid pressure is not limited to this, and the liquid pressure may be used. That is, a pressure fluid supply means or a pressurizing mechanism using hydraulic pressure may be adopted.
【００６８】[0068]
【発明の効果】以上説明したように本発明の貫通欠陥検
知装置によれば、流体圧力で拡張する複数の拡張部材で
配管の内部を配管軸方向に区切り、この区切られたシー
ル空間へそのシール空間の近傍に配置した逆止弁部を通
じて圧力流体を供給し、シール空間の圧力降下を圧力セ
ンサで検知するようにしたから、配管全体での検知に比
べ、小容量の空間で、精度よく、さらには温度の変化、
大気圧の変化を受けないよう短い計測時間で、配管の貫
通欠陥を検知できる。しかも、拡張部材は、配管の他の
場所に移動可能なので、任意の場所での検査を行え、漏
洩場所の特定もできる。According to penetrations defect detection device of the present invention as described above, according to the present invention, a plurality of expansion member for expanding a fluid pressure separate the interior of the pipe in the pipe axis direction, of the separated seal space navel Check valve located near the seal space
The pressure fluid is then supplied, and the pressure drop in the seal space is detected by the pressure sensor.Therefore, compared to the detection of the entire pipe, the space is small, the accuracy is high, and the temperature changes.
Piping penetration defects can be detected in a short measurement time so as not to change atmospheric pressure. Moreover, since the expansion member can be moved to another place of the pipe, it is possible to perform an inspection at any place and to identify the leakage place.
【００６９】したがって、短時間の計測時間、かつ高い
精度で、配管の貫通欠陥の有無をその貫通欠陥の場所の
特定と併せて検知することができる。Therefore, it is possible to detect the presence / absence of a penetrating defect in the pipe together with the location of the penetrating defect with a short measuring time and with high accuracy.
【００７０】しかも、拡張部材として、配管の内周面と
接する表面部分が内周方向に沿う環状の突起状部が形成
された弾性ゴム膜を用いたので、配管を配管軸方向に区
切るシール壁を高い接触面圧で配管内周面と接触させる
ことができ、同シール壁で形成される密封空間のシール
性を格段に向上させて、一層、高い検知能力をもたらせ
ることができる。Moreover, as the expansion member, since the elastic rubber film in which the surface portion in contact with the inner peripheral surface of the pipe is formed with the annular protruding portion along the inner peripheral direction is used, the seal wall for partitioning the pipe in the axial direction of the pipe is used. Can be brought into contact with the inner peripheral surface of the pipe with a high contact surface pressure, the sealability of the sealed space formed by the seal wall can be markedly improved, and a higher detection capability can be provided.
【図１】本発明の一実施形態の配管の貫通欠陥検知装置
の全体を示す図。FIG. 1 is a diagram showing an entire pipe penetration defect detection apparatus according to an embodiment of the present invention.
【図２】同貫通欠陥検知装置のシール／検査圧封入部の
構成を詳しく示す断面図。FIG. 2 is a cross-sectional view showing in detail the configuration of a seal / inspection pressure enclosing section of the same penetration defect detection device.
【図３】同シール／検査圧封入部の弾性ゴム膜の外周面
に円周方向に沿って形成された突条を説明するための断
面図。FIG. 3 is a cross-sectional view for explaining a ridge formed along the circumferential direction on the outer peripheral surface of the elastic rubber film of the seal / inspection pressure sealing portion.
１…プローブ １０…シール機構 １２ａ，１２ｂ…弾性ゴム膜（拡張部材） １３，１７…サポートリング １５，１８…保持金具（保持部材） ２８…ガス圧供給部（圧力流体供給手段，加圧機構） ３０…環状の突条（突起状部） ３３…密封空間（シール空間） ３４…圧力センサ ３６…欠陥判定部（判定手段） Ａ…配管 α，β…シール壁。 1 ... probe 10 ... Sealing mechanism 12a, 12b ... Elastic rubber film (expansion member) 13, 17 ... Support ring 15, 18 ... Holding metal fitting (holding member) 28 ... Gas pressure supply unit (pressure fluid supply means, pressurization mechanism) 30 ... Annular ridge (projection portion) 33 ... Sealed space (sealed space) 34 ... Pressure sensor 36 ... Defect determination section (determination means) A ... Piping α, β ... Seal walls.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 内田 豊実 茨城県那珂郡東海村大字村松４番地33 核燃料サイクル開発機構東海事業所内 (72)発明者 白土 陽治 茨城県那珂郡東海村大字村松４番地33 核燃料サイクル開発機構東海事業所内 (72)発明者 田中 津義 茨城県那珂郡東海村大字村松４番地33 核燃料サイクル開発機構東海事業所内 (72)発明者 赤松 哲郎 兵庫県高砂市荒井町新浜二丁目１番１号 三菱重工業株式会社高砂研究所内 (72)発明者 川口 昭博 兵庫県高砂市荒井町新浜二丁目１番１号 三菱重工業株式会社高砂研究所内 (72)発明者 市瀬 順一 兵庫県高砂市荒井町新浜二丁目１番１号 三菱重工業株式会社高砂研究所内 (56)参考文献 特開 昭52−2592（ＪＰ，Ａ) 特開 平３−9234（ＪＰ，Ａ) 特開 昭47−37480（ＪＰ，Ａ) 実開 昭53−17281（ＪＰ，Ｕ) 実開 昭60−102650（ＪＰ，Ｕ) 実開 昭63−25345（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) G01M 3/28 G01M 3/26 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Toyomi Uchida 4-3 Muramatsu, Tokai-mura, Naka-gun, Ibaraki Prefecture 33 Tokai Plant, Nuclear Fuel Cycle Development Organization (72) Yoji Shirato 4-3 Muramatsu, Tokai-mura, Naka-gun, Ibaraki Prefecture Nuclear Fuel Cycle Development Organization Tokai Works (72) Inventor Tsuyoshi Tanaka 4-4 Muramatsu, Tokai Village, Naka-gun, Naka-gun, Ibaraki Prefecture 33 Nuclear Fuel Cycle Development Organization Tokai Works (72) Inventor Tetsuro Akamatsu 2-chome, Niihama, Arai-cho, Takasago, Hyogo Prefecture No. 1 Mitsubishi Heavy Industries, Ltd. Takasago Research Institute (72) Inventor Akihiro Kawaguchi 1-1-1, Niihama, Arai-cho, Takasago-shi, Hyogo Prefecture Mitsubishi Heavy Industries Ltd. Takasago Research Institute (72) Inventor, Junichi Ichise Niihama, Arai-cho, Takasago-shi Hyogo Prefecture 1-1 No. 1 in Takasago Research Laboratory, Mitsubishi Heavy Industries, Ltd. (56) Reference JP-A-52-25 92 (JP, A) JP-A-3-9234 (JP, A) JP-A-47-37480 (JP, A) Actually open Sho 53-17281 (JP, U) Actually open 60-102650 (JP, U) 63-25345 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) G01M 3/28 G01M 3/26
Claims (2)
定の間隔で、圧力流体を受けると該配管の内周面に向か
い拡張する複数の拡張部材を配置して構成されるシール
機構と、 前記各拡張部材に該拡張部材が前記配管の内周面と接す
るまで拡張するように圧力流体を供給し、前記配管内を
配管軸方向に区切るシール壁を形成する圧力流体供給手
段と、圧力流体を前記配管外から、前記 シール壁で区切られた
配管内のシール空間の近傍に配置した逆止弁部を通じ
て、前記シール空間へ供給し該シール空間を所定圧に加
圧する加圧機構と、 前記シール空間の圧力を検知する圧力センサと、 この圧力センサの出力変化から前記配管の貫通欠陥の有
無を判定する判定手段と、 を具備してなることを特徴とする配管の貫通欠陥検知装
置。1. A seal mechanism, which is inserted into a pipe, and is arranged at predetermined intervals in the axial direction of the pipe, and is formed by arranging a plurality of expansion members that expand toward an inner peripheral surface of the pipe when a pressure fluid is received. A pressure fluid supply means for supplying a pressure fluid to each of the expansion members so as to expand until the expansion members come into contact with the inner peripheral surface of the pipe, and forming a seal wall that divides the inside of the pipe in the pipe axial direction, Pressurized fluid from outside of the pipe through the check valve section located near the seal space inside the pipe separated by the seal wall.
A pressure mechanism for supplying the seal space with a predetermined pressure, a pressure sensor for detecting the pressure in the seal space, and a change in the output of the pressure sensor to determine the presence or absence of a penetration defect in the pipe. A device for detecting a penetration defect of a pipe, comprising:
する表面部分を有し、該表面部分には該配管の内周方向
に渡り環状の突起状部が形成された弾性ゴム膜から構成
されることを特徴とする請求項１に記載の配管の貫通欠
陥検知装置。2. The elastic member having a surface portion in contact with the inner peripheral surface of the pipe, wherein the expansion member is formed of an elastic rubber film on which an annular protrusion is formed along the inner peripheral direction of the pipe. The pipe penetration defect detection device according to claim 1 , wherein the pipe penetration defect detection device is configured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000015902A JP3372521B2 (en) | 2000-01-25 | 2000-01-25 | Piping penetration defect detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000015902A JP3372521B2 (en) | 2000-01-25 | 2000-01-25 | Piping penetration defect detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001208667A JP2001208667A (en) | 2001-08-03 |
| JP3372521B2 true JP3372521B2 (en) | 2003-02-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000015902A Expired - Fee Related JP3372521B2 (en) | 2000-01-25 | 2000-01-25 | Piping penetration defect detection device |
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| Country | Link |
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| JP (1) | JP3372521B2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6845412B2 (en) * | 2015-08-31 | 2021-03-17 | 横浜市 | Water pressure test equipment |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2001208667A (en) | 2001-08-03 |
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