JP5115754B2 - Bourdon tube pressure gauge - Google Patents

Bourdon tube pressure gauge Download PDF

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JP5115754B2
JP5115754B2 JP2009120343A JP2009120343A JP5115754B2 JP 5115754 B2 JP5115754 B2 JP 5115754B2 JP 2009120343 A JP2009120343 A JP 2009120343A JP 2009120343 A JP2009120343 A JP 2009120343A JP 5115754 B2 JP5115754 B2 JP 5115754B2
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bourdon tube
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pressure
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JP2010249791A (en
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允 重永
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株式会社西技計測コンサルタント
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Description

本発明はブルドン管圧力計に関し、特にブルドン管の開口固定端から導入する測定圧力流体と該測定圧力流体を導入する構造に特徴を有するブルドン管圧力計に関する。  The present invention relates to a Bourdon tube pressure gauge, and more particularly to a measurement pressure fluid introduced from an opening fixed end of a Bourdon tube and a Bourdon tube pressure gauge characterized by a structure for introducing the measurement pressure fluid.

ダム堰堤に所定以上の水圧がかかると、ダム堰堤が撓み、ひいては決壊等が生じるおそれがある。このような危険な状態を回避するために、ダム湖の湖底地下水の水圧（揚圧）を定期的に測定し、地下水の水圧が一定値以上になるとダム湖の水を放流し、ダム湖の地下水の圧力が安全値を超えないようにする必要がある。ダム湖の地下水の水圧を測定するために、一般的にダム堰堤内部の監査廊にダム堰堤の長さ方向に沿って所定間隔を有してブルドン管圧力計を設置している。
通常、ブルドン管圧力計は、断面がＣ形、若しくはスパイラル、或はヘリカルの何れかの形状の金属パイプよりなるブルドン管内に、ブルドン管の開口固定端から測定圧力流体を導入すると、導入された測定圧力流体の圧力に応じてブルドン管の曲率が変位し、ブルドン管の密閉自由端（管先）が変位し、密閉自由端にリンクされた拡大機構や歯車機構により指針が回転し、指針の位置の目盛板上の目盛が測定圧力になるように構成されている（特許文献１、特許文献２、特許文献３、特許文献４、特許文献５、又は非特許文献１参照）。
ダム堰堤内部の監査廊に設置するブルドン管圧力計は、ダム堰堤下方に於けるダム湖の湖底地中内に立上げ管下部を埋設すると共に、ダム堰堤の監査廊内に於いて立上げ管を立設し、立上げ管下端開口より揚水され立上げ管内に導入されたダム湖における湖底地中の地下水が立上げ管上端部で分流するように、導水路をブルドン管方向と排水口方向に分岐し、排水口側にはバルブを介装し、該バルブを閉じるとダム湖湖底地中の地下水が立上げ管を経てブルドン管内に導入されブルドン管の密閉自由端を変位させて地下水の圧力を測定可能にしていた。
上記従来のブルドン管圧力計は、ブルドン管内に測定圧力流体を直接導入して圧力を測定する構造であったので、ブルドン管内に導入された地下水に含まれる石灰分やその他ミネラル分が固化してブルドン管内壁面に強く付着していた。特に、ブルドン管開口固定端は口径が極めて小さく形成されているので、ブルドン管開口内壁面にこびり付いた石灰分等により、ブルドン管開口固定端開口は閉塞され、ブルドン管圧力計は機能しなくなるという事態が生じていた。ブルドン管圧力計は、地下水の揚圧を測定しない場合は、バルブを開放し、常時立上げ管から揚水した地下水を分岐部を通って排水口より監査廊の排水溝に排水落下し続けるように構成されているため、ブルドン管の開口固定端は常時地下水に接触し、ブルドン管の開口端には石灰分等がこびり付きやすい。ブルドン管内壁面にこびり付いた石灰分等は、そのままではブルドン管内壁面から剥離しないため、ブルドン管を交換する等のメンテナンス作業を頻繁にする必要性があるという問題点があった。If water pressure more than a predetermined level is applied to the dam dam, the dam dam may bend and eventually break down. In order to avoid such a dangerous situation, the water pressure (uplift) of the bottom of the dam lake is measured regularly, and when the groundwater pressure exceeds a certain value, the dam lake water is discharged, It is necessary to ensure that groundwater pressure does not exceed a safe value. In order to measure the water pressure of groundwater in a dam lake, a Bourdon tube pressure gauge is generally installed at a predetermined interval along the length of the dam dam in an inspection gallery inside the dam dam.
Usually, a Bourdon tube pressure gauge is introduced when a measurement pressure fluid is introduced from a fixed opening end of a Bourdon tube into a Bourdon tube made of a metal pipe having a C-shaped, spiral, or helical cross section. The curvature of the Bourdon tube is displaced according to the pressure of the measured pressure fluid, the free end (tube end) of the Bourdon tube is displaced, and the pointer is rotated by the expansion mechanism or gear mechanism linked to the free end of the seal. It is comprised so that the scale on the scale plate of a position may become measurement pressure (refer patent document 1, patent document 2, patent document 3, patent document 4, patent document 5, or nonpatent literature 1).
The Bourdon tube pressure gauge installed in the audit gallery inside the dam dam is embedded in the bottom of the dam lake below the dam dam, and in the audit gallery of the dam dam. In order to allow groundwater in the bottom of the dam lake to be pumped from the lower end opening of the riser pipe and introduced into the riser pipe, the waterway will be diverted at the upper end of the riser pipe in the direction of the Bourdon pipe and the outlet When the valve is closed, the groundwater in the bottom of the dam lake is introduced into the Bourdon pipe through the riser pipe, and the free end of the Bourdon pipe is displaced to displace the groundwater. The pressure was measurable.
The conventional Bourdon tube pressure gauge has a structure in which the pressure is measured by directly introducing the measurement pressure fluid into the Bourdon tube, so that lime and other minerals contained in the groundwater introduced into the Bourdon tube are solidified. It was strongly attached to the inner wall of the Bourdon tube. In particular, since the Bourdon tube opening fixed end is formed with a very small diameter, the Bourdon tube opening fixed end opening is blocked by lime or the like stuck to the inner wall surface of the Bourdon tube opening, and the Bourdon tube pressure gauge stops functioning. Things were happening. When the groundwater pressure is not measured, the Bourdon tube pressure gauge opens the valve so that the groundwater pumped up from the standing pipe is continuously drained and dropped from the drainage outlet to the drainage channel of the inspection gallery through the branch. Since it is configured, the opening fixed end of the Bourdon tube is always in contact with the groundwater, and lime or the like tends to stick to the opening end of the Bourdon tube. Since the lime content stuck to the inner wall surface of the Bourdon tube does not peel off from the inner wall surface of the Bourdon tube as it is, there is a problem that it is necessary to frequently perform maintenance work such as replacing the Bourdon tube.

【０００３】
又、特許文献５には、圧力エレメントを封入配設した密閉ケース内にグリセリン液を充填し、仮に圧力エレメントが過大な圧力により破裂しても密閉ケースの前面ガラス等が破壊することがないように構成された液入圧力計が記載されている。
特許文献５に記載の圧力計も、圧力エレメント内に直接測定圧力流体を導入して測定圧力流体の圧力を測定する構成であるため、ダム湖湖底地中の地下水の揚圧測定に用いると
、圧力エレメントの内壁面に圧力エレメント内に導入された地下水中の石灰分やその他ミネラル分が固化してブルドン管内壁面に強くこびりつき、圧力測定計としての寿命が極めて短寿命であるという問題点があった。
【特許文献１】特開平９−１１３３８９号公報
【特許文献２】実開平２−１２９８３５号公報
【特許文献３】特開２００７−１９８８９１号公報
【特許文献４】特開２００６−１６２５０２号公報
【特許文献５】実開昭６１−１６１６３７号公報
【非特許文献１】インターネット上における第一計器製作所のホームページ
【発明の開示】
【発明が解決しようとする課題】[0003]
In Patent Document 5, glycerin liquid is filled in a sealed case in which a pressure element is enclosed, and the front glass of the sealed case is not broken even if the pressure element is ruptured by excessive pressure. Is a liquid-filled pressure gauge.
Since the pressure gauge described in Patent Document 5 is also configured to measure the pressure of the measurement pressure fluid by directly introducing the measurement pressure fluid into the pressure element, when used for the measurement of the groundwater uplift in the dam lake bottom, There is a problem that the lime and other minerals in the groundwater introduced into the pressure element solidify on the inner wall of the pressure element and strongly stick to the inner wall of the Bourdon tube, resulting in a very short life as a pressure gauge. It was.
[Patent Document 1] Japanese Patent Laid-Open No. 9-113389 [Patent Document 2] Japanese Utility Model Laid-Open No. 2-129835 [Patent Document 3] Japanese Patent Laid-Open No. 2007-198891 [Patent Document 4] Japanese Patent Laid-Open No. 2006-162502 [Patent Document 3] Reference 5: Japanese Utility Model Publication No. 61-161537 [Non-patent Document 1] Homepage of Daiichi Keiki Seisakusho on the Internet [Disclosure of the Invention]
[Problems to be solved by the invention]

本願発明は上記従来技術の有する問題点に鑑みて創案されたものであって、揚水した地下水の圧力をオイルブーツ内のオイルに伝達し、ブルドン管内に揚水した地下水を導入することなくオイルブーツ内のオイルのみを導入し、オイルの圧力でブルドン管の密閉自由端を変位させるようにし、ブルドン管の内壁面に水に含有される石灰等のミネラル分の付着を防止し、長寿命化を図ったブルドン管圧力計を提供することを目的とする。  The present invention was devised in view of the above-mentioned problems of the prior art, and transmits the pressure of the pumped groundwater to the oil in the oil boot, and the oil boot without introducing the groundwater pumped into the Bourdon pipe. Only the oil is introduced and the free end of the Bourdon tube is displaced by the oil pressure to prevent adhesion of minerals such as lime contained in the water to the inner wall surface of the Bourdon tube, thereby extending the service life. The purpose is to provide a Bourdon tube pressure gauge.

【０００５】
本願発明は、測定圧力流体が導入される開口固定端と、導入された測定圧力流体の圧力に応じて変位する密閉自由端を具備したブルドン管と、密閉自由端の変位を指針の回転に変換する圧力表示変換機構と、測定圧力流体の導水路となり、導入された流体をブルドン管側と排水口側に夫々分流するための分流部を具備した立上げ管とからなるブルドン管圧力計において、前記ブルドン管の開口固定端と前記分流部に於けるブルドン管側開口との間には、接続管を連通接続して介装し、耐水性、耐油性、耐薬品性、高弾性及び高可撓性を有する合成樹脂製薄片よりなり、扁平な底面１０と、接続管７の内径と略同径の円筒部と、上端開口全周囲より外側方向に張り出したフランジ部１１よりなる有底オイルブーツを、該有底オイルブーツのフランジ部を前記接続管の上端に水密に取り付け、前記接続管の内側中空部に吊り下げて配設し、前記立上げ管から揚水された水がオイルブーツと接続管との隙間に入り込まないように、前記オイルブーツの底面外周と前記接続管の内周面との間には、シール用Ｏリングを設け、前記立上げ管に揚水導入された流体の圧力が、前記オイルブーツの底部外側に前記立上げ管長さ方向に沿って前記ブルドン管開口固定端方向へ加圧することにより、前記オイルブーツ内のオイルを前記ブルドン管開口固定端からブルドン管内部に導入して前記立上げ管に揚水された測定圧力流体の揚圧を測定可能に、前記オイルブーツの上端開口は前記ブルドン管開口固定端の開口と連通接続されていることを特徴とする。
【発明の効果】[0005]
The invention of the present application converts the fixed end of the opening into which the measurement pressure fluid is introduced, the bourdon tube having the sealed free end that is displaced according to the pressure of the introduced measurement pressure fluid, and the displacement of the sealed free end into rotation of the pointer. In the Bourdon tube pressure gauge comprising a pressure display conversion mechanism and a measurement pressure fluid conduit, and a riser pipe having a diverting part for dividing the introduced fluid into the Bourdon tube side and the drain port side, A connecting pipe is connected between the opening fixed end of the Bourdon pipe and the Bourdon pipe side opening in the flow dividing section, so that water resistance, oil resistance, chemical resistance, high elasticity and high flexibility are provided. A bottomed oil boot made of a synthetic resin thin piece having flexibility, comprising a flat bottom surface 10, a cylindrical portion having substantially the same diameter as the inner diameter of the connecting pipe 7, and a flange portion 11 projecting outward from the entire periphery of the upper end opening. The bottomed oil boots At the upper end of the connecting pipe, a water-tight fitting is attached to the upper end of the connecting pipe and suspended from the inner hollow part of the connecting pipe so that water pumped up from the rising pipe does not enter the gap between the oil boot and the connecting pipe. In addition, an O-ring for sealing is provided between the outer periphery of the bottom surface of the oil boot and the inner peripheral surface of the connection pipe, and the pressure of the fluid introduced into the rising pipe is pumped to the outside of the bottom of the oil boot. By pressurizing along the length of the riser tube toward the Bourdon tube opening fixed end, the oil in the oil boot is introduced into the Bourdon tube from the Bourdon tube opening fixed end and pumped to the riser tube. The upper end opening of the oil boot is connected to the opening of the Bourdon tube opening fixed end so as to be able to measure the lift of the measured pressure fluid.
【Effect of the invention】

本願発明は、立上げ管から揚水した流体の揚圧でオイルブーツ底面を加圧し、この加圧によりオイルブーツ内のオイルをブルドン管内に導入し、導入されたオイルの圧力に応じてブルドン管の曲率を変位させ、ブルドン管の密閉自由端の変位をリンク機構や歯車機構を介して拡大して指針の目盛板上の目盛が測定圧力になるように構成されているので、ブルドン管内にオイルが出入され、オイルブーツ内のオイルを測定圧力流体として使用するので、ブルドン管内に水に含まれる石灰等のミネラル分が付着することなく、ブルドン管の長寿命化し、ブルドン管の交換等のメンテナンス作業が不必要であるという効果がある。  The invention of the present application pressurizes the bottom surface of the oil boot with the pumping pressure of the fluid pumped from the riser pipe, the oil in the oil boot is introduced into the Bourdon pipe by this pressurization, and according to the pressure of the introduced oil, Since the curvature is displaced and the displacement of the closed free end of the Bourdon tube is expanded via a link mechanism or gear mechanism so that the scale on the scale plate of the pointer becomes the measurement pressure, the oil in the Bourdon tube Since the oil in and out of the oil boot is used as the measurement pressure fluid, maintenance work such as replacement of the Bourdon tube, extending the life of the Bourdon tube without depositing minerals such as lime contained in the water in the Bourdon tube There is an effect that is unnecessary.

ブルドン管の開口固定端と立上げ管分流部に於けるブルドン管側開口との間には接続管を連通接続して介装し、該接続管内にオイルを充填した高弾性及び高撓性を有する材質よりなる有底オイルブーツを収納配設し、立上げ管の一端開口から導入される地下水の揚圧をオイルブーツ底面に加圧するようにし、ブルドン管内に導入される測定圧力流体をオイルブーツ内のオイルにすることで、水に含有される石灰等のミネラル分がブルドン管内壁面に付着しないようにしブルドン管のメンテナンス作業を不要にすることを実現した。  A connecting pipe is connected between the fixed end of the opening of the Bourdon pipe and the Bourdon pipe side opening in the branching section of the rising pipe, and has high elasticity and high flexibility filled with oil in the connecting pipe. A bottomed oil boot made of a material is housed and arranged so that the pressure of groundwater introduced from one end opening of the rising pipe is pressurized to the bottom of the oil boot, and the measured pressure fluid introduced into the Bourdon pipe is used as the oil boot. By using the oil in the inside, it was possible to prevent minerals such as lime contained in the water from adhering to the inner wall surface of the Bourdon tube and to eliminate the maintenance work of the Bourdon tube.

以下、図を参照にして本願発明の実施例について説明する。図１はブルドン管圧力計の要部の分解構成説明図、図２はブルドン管圧力計の要部の縦断面図、図３はブルドン管圧力計の取り付け状態を示す部分断面付き正面図である。
これらの図において、揚水管１はダム湖の湖底２に対して略９０度の角度を有し、揚水管１の下端開口が湖底２より所定の深さに位置するように埋設されている。揚水管１の外側には、揚水管１の外周面を保護するために埋設ガイド管３を設けている。
湖底２に於いて、揚水管１の上端開口と揚水管１の径よりも小径な立上げ管５の下端開口とは、異径ソケット４を介して連通接続されている。立上げ管５は、ダム湖の湖底２に対して９０度の角度を有してダム堰堤監査廊内に立設されている。
チーズ６は、１８０度方向の対向する２方向と９０度方向の１方向の合計３方向が開口されたエルボであって、夫々の開口内端面には雌螺子が刻設されている。チーズ６の対向する開口のうち一方の開口に立上げ管５の上端開口が水密に連通接続されている。接続管７の上下両端外周面には、夫々雄螺子が切られている。チーズ６の１８０度方向に対向する１対の開口のうち立上げ管５と接続していない他方の開口には接続管７の下端開口が水密に接続され、接続管７はチーズ６を介装して立上げ管５と一直線状に連通接続されている。実施例１では、管を水密に連通接続するためにブッシング８を用いている。例えば、接続管７の下端外周面に刻設された雄螺子と、ブッシング８の内面に刻設された雌螺子とを螺着し、さらにブッシング８の外周面に切られた雄螺子をチーズ６の立上げ管５と接続していない他方開口の内周面に刻設された雌螺子に螺着させて、接続管７と立上げ管５をチーズ６を介装して水密に連通接続している。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram of an exploded configuration of a main part of a Bourdon tube pressure gauge, FIG. 2 is a longitudinal sectional view of the main part of a Bourdon tube pressure gauge, and FIG. 3 is a front view with a partial cross section showing a mounting state of the Bourdon tube pressure gauge. .
In these drawings, the pumping pipe 1 has an angle of about 90 degrees with respect to the lake bottom 2 of the dam lake, and is embedded so that the lower end opening of the pumping pipe 1 is located at a predetermined depth from the lake bottom 2. A buried guide pipe 3 is provided outside the pumping pipe 1 to protect the outer peripheral surface of the pumping pipe 1.
In the lake bottom 2, the upper end opening of the pumping pipe 1 and the lower end opening of the rising pipe 5 having a diameter smaller than the diameter of the pumping pipe 1 are connected to each other via a socket 4 having a different diameter. The rising pipe 5 is erected in the dam dam inspection gallery at an angle of 90 degrees with respect to the bottom 2 of the dam lake.
The cheese 6 is an elbow in which a total of three directions of two opposite directions in the 180 degree direction and one direction in the 90 degree direction are opened, and a female screw is engraved on each inner end face of the opening. The upper end opening of the rising pipe 5 is connected in watertight communication with one of the openings facing the cheese 6. Male screws are cut on the outer peripheral surfaces of the upper and lower ends of the connecting pipe 7. The lower end opening of the connecting pipe 7 is watertightly connected to the other opening that is not connected to the rising pipe 5 among the pair of openings facing the 180 ° direction of the cheese 6, and the connecting pipe 7 interposes the cheese 6. Thus, it is connected to the rising pipe 5 in a straight line. In the first embodiment, the bushing 8 is used to connect the pipes in a watertight manner. For example, a male screw engraved on the outer peripheral surface of the lower end of the connecting tube 7 and a female screw engraved on the inner surface of the bushing 8 are screwed together, and the male screw cut on the outer peripheral surface of the bushing 8 is replaced with the cheese 6. The connecting pipe 7 and the rising pipe 5 are connected in a watertight manner through the cheese 6 by being screwed onto a female screw carved on the inner peripheral surface of the other opening not connected to the rising pipe 5. ing.

接続管７の内側中空部には、有底オイルブーツ９を配設している。有底オイルブーツ９は耐水性、耐油性、耐薬品性、高弾性及び高可撓性を有する合成樹脂製薄片よりなり、僅かな水圧によっても影響を受けるようにしている。有底オイルブーツ９は、扁平な底面１０と、接続管７の内径と略同径の円筒部と、上端開口と、上端開口全周囲より外側方向に張り出したフランジ部１１より構成されている。オイルブーツ９の内側にはオイルが充填されている。オイルブーツ９は、フランジ部１１を接続管７の上端開口端面に掛止することにより、接続管７の中空部に吊り下げている。フランジ部１１の上面にはＯリング１２を載置している。オイルブーツ９の底面１０の外周と接続管７の内周面との間には、シール用のＯリング１３を設けて、立上げ管５から揚水された水がオイルブーツ９と接続管７との隙間に入り込まないようにしている。
ゲージニップル１４は同径筒体の内側に雌螺子を刻設し、底面中央に小孔１５を穿設し、下端外周には外側方に張り出すフランジ部１６を設けている。フランジ部１６の外径と、フランジ部１１の外径は略同径に形成されている。ゲージニップル１４は、フランジ部１６の底面がＯリング１２と重合するように配設している。
株１７の下方には接続螺子１８が連設されている。接続螺子１８は外周面に雄螺子が刻設され、内側にはブルドン管（図示せず）の内部測定圧力流体導入部と連通する圧力導入孔１９を軸心に沿って貫通して設けている。接続螺子１８の雄螺子部は、ゲージニップル１４の雌螺子と螺着し、接続螺子１８の圧力導入孔下端開口は小孔１５に開口されている。つまり、ブルドン管の内部測定圧力流体導入部と、圧力導入孔１９と、オイルブーツ９の中空部が、オイルが外部に漏出しないように気密に連通接続されている。ロックナット２６は内周面に雌螺子が刻設されており、ロックナット２６を接続管７の下端外周に設けた雄螺子に螺着しオイルブーツ９、ゲージニップル１４及び接続螺子１８を緊締して強固に取り付けている。ゲージ本体２０は、表面側に透明板を配設した密閉ケース内に目盛板を設け、ブルドン管の密閉自由端にリンク機構或は歯車機構等により取り付けた指針が、ブルドン管の管先の変位を目盛板に指し示して表示するようにしている。A bottomed oil boot 9 is disposed in the inner hollow portion of the connecting pipe 7. The bottomed oil boot 9 is made of a synthetic resin flake having water resistance, oil resistance, chemical resistance, high elasticity and high flexibility, and is influenced by a slight water pressure. The bottomed oil boot 9 includes a flat bottom surface 10, a cylindrical portion having substantially the same diameter as the inner diameter of the connection pipe 7, an upper end opening, and a flange portion 11 projecting outward from the entire periphery of the upper end opening. The oil boot 9 is filled with oil. The oil boot 9 is suspended from the hollow portion of the connection pipe 7 by hooking the flange portion 11 to the upper end opening end face of the connection pipe 7. An O-ring 12 is placed on the upper surface of the flange portion 11. An O-ring 13 for sealing is provided between the outer periphery of the bottom surface 10 of the oil boot 9 and the inner peripheral surface of the connection pipe 7, so that the water pumped up from the rising pipe 5 flows between the oil boot 9 and the connection pipe 7. I try not to get into the gap.
The gauge nipple 14 has a female screw formed on the inner side of the same-diameter cylindrical body, a small hole 15 formed in the center of the bottom surface, and a flange portion 16 projecting outward on the outer periphery of the lower end. The outer diameter of the flange portion 16 and the outer diameter of the flange portion 11 are formed to be substantially the same diameter. The gauge nipple 14 is disposed so that the bottom surface of the flange portion 16 overlaps with the O-ring 12.
A connecting screw 18 is continuously provided below the stock 17. The connection screw 18 has a male screw formed on the outer peripheral surface thereof, and a pressure introduction hole 19 communicating with an internal measurement pressure fluid introduction portion of a Bourdon tube (not shown) is provided inside the connection screw 18 along the axis. . The male screw portion of the connecting screw 18 is screwed with the female screw of the gauge nipple 14, and the lower end opening of the pressure introducing hole of the connecting screw 18 is opened in the small hole 15. In other words, the internal measurement pressure fluid introduction part of the Bourdon tube, the pressure introduction hole 19 and the hollow part of the oil boot 9 are connected in an airtight manner so that the oil does not leak outside. The lock nut 26 has a female screw engraved on the inner peripheral surface thereof, and the lock nut 26 is screwed to a male screw provided on the outer periphery of the lower end of the connection pipe 7, and the oil boot 9, the gauge nipple 14 and the connection screw 18 are tightened. And firmly attached. The gauge body 20 is provided with a scale plate in a sealed case with a transparent plate on the surface side, and a pointer attached to the free end of the Bourdon tube by a link mechanism or a gear mechanism is used to displace the tip of the Bourdon tube. Is displayed on the scale plate.

チーズ６の９０度方向に開口する開口部には両ニップル２１の一端開口部を連通接続している。両ニップル２１の他端開口にはバルブ２２を介装して両ニップル２３を連通接続し、９０°エルボ２４を介装してカットニップル２５を連通接続している。カットニップル２５は、下端開口面が傾斜面となるように、外側長さを内側ながさよりも長く形成している。カットニップル２５は、監査廊の排水溝上に開口するように配設している。  One end openings of both nipples 21 are connected to the opening of the cheese 6 that opens in the 90-degree direction. Both nipples 23 are connected to the other end openings of both nipples 21 via a valve 22, and a cut nipple 25 is connected to each other via a 90 ° elbow 24. The cut nipple 25 has an outer length longer than an inner length so that the lower end opening surface is an inclined surface. The cut nipple 25 is disposed so as to open on the drainage groove of the inspection gallery.

次に作用について説明する。
湖底２の地中の地下水の揚圧を測定する場合は、バルブ２２を閉じる。地下水は、湖底２の地中に埋設された揚水管１の下端開口より揚水され、立上げ管５を経てチーズ６内に導入され、更に接続管７及び両ニップル２１内へ導入される。バルブ２２が閉じているため、地下水は接続管７内に吊設されているオイルブーツ９の平坦な底面１０に加圧する。又、バルブ２２は閉じているため、導入された地下水はバルブ２２より両ニップル２３側へは送水されない。地下水の揚圧により、オイルブーツ９の底面１０は上方へ撓み、オイルブーツ９内に充填されているオイルは、オイルブーツ９の上端開口及びゲージニップル１４の小孔１５より圧力導入孔１９へ送出され、ブルドン管（図示しない）内へ導入される。導入されたオイルの圧力に応じてブルドン管の曲率が変位し、ブルドン管の密閉自由端（管先）が変位し、密閉自由端にリンクされた拡大機構や歯車機構により指針が回転し、指針の位置の目盛板上の目盛が測定圧力になるようにしている。
ブルドン管内に導入される測定圧力流体は、地下水の揚圧により加圧されたオイルブーツ９内のオイルであるので、ブルドン管内に地下水が導入されることは無く、ブルドン管内壁面に水に含まれる石灰分等がこびりつかないという効果がある。Next, the operation will be described.
When measuring the groundwater uplift in the ground of the lake bottom 2, the valve 22 is closed. The groundwater is pumped from the lower end opening of the pumping pipe 1 buried in the ground of the lake bottom 2, introduced into the cheese 6 through the rising pipe 5, and further introduced into the connecting pipe 7 and both nipples 21. Since the valve 22 is closed, the groundwater pressurizes the flat bottom surface 10 of the oil boot 9 suspended in the connecting pipe 7. Further, since the valve 22 is closed, the introduced groundwater is not sent from the valve 22 to the nipples 23 side. The bottom surface 10 of the oil boot 9 bends upward due to the groundwater pressure, and the oil filled in the oil boot 9 is sent to the pressure introducing hole 19 from the upper end opening of the oil boot 9 and the small hole 15 of the gauge nipple 14. And introduced into a Bourdon tube (not shown). The curvature of the Bourdon tube is displaced according to the pressure of the introduced oil, the closed free end (tube end) of the Bourdon tube is displaced, and the pointer is rotated by the expansion mechanism and gear mechanism linked to the closed free end. The scale on the scale plate is set to the measurement pressure.
Since the measurement pressure fluid introduced into the Bourdon tube is the oil in the oil boot 9 pressurized by the groundwater uplift, the groundwater is not introduced into the Bourdon tube and is contained in the water on the inner wall surface of the Bourdon tube. There is an effect that lime etc. do not stick.

地下水の揚圧を測定しない場合は、バルブ２２を開にし、地下水が立上げ管５、チーズ６、両ニップル２２、及び両ニップル２３を経てカットニップル２５より監査廊の排水溝に落水するようにしている。地下水の揚圧が高くなっても、バルブ２２が開であるので、オイルブーツ９に揚圧は負荷しないため、指針は０を表示している状態を保持する。  If the groundwater pressure is not measured, the valve 22 is opened so that the groundwater flows from the cut nipple 25 into the drainage channel of the inspection gallery via the riser pipe 5, the cheese 6, both nipples 22, and both nipples 23. ing. Even if the groundwater pressure increases, the valve 22 is open, so that the oil boot 9 is not loaded with pressure. Therefore, the pointer maintains a state where 0 is displayed.

ブルドン管圧力計の要部の分解構成説明図である。（実施例１）It is decomposition | disassembly structure explanatory drawing of the principal part of a Bourdon tube pressure gauge. Example 1 ブルドン管圧力計の要部の縦断面図である。（実施例１）It is a longitudinal cross-sectional view of the principal part of a Bourdon tube pressure gauge. Example 1 ブルドン管圧力計の取り付け状態を示す部分断面付き正面図である。（実施例１）It is a front view with a partial cross section which shows the attachment state of a Bourdon tube pressure gauge. Example 1

５ 立上げ管
７ 接続管
９ オイルブーツ5 Startup pipe 7 Connection pipe 9 Oil boot

Claims (1)

測定圧力流体が導入される開口固定端と、導入された測定圧力流体の圧力に応じて変位する密閉自由端を具備したブルドン管と、
密閉自由端の変位を指針の回転に変換する圧力表示変換機構と、
測定圧力流体の導水路となり、導入された流体をブルドン管側と排水口側に夫々分流するための分流部を具備した立上げ管とからなるブルドン管圧力計において、
前記ブルドン管の開口固定端と前記分流部に於けるブルドン管側開口との間には、接続管を連通接続して介装し、
耐水性、耐油性、耐薬品性、高弾性及び高可撓性を有する合成樹脂製薄片よりなり、扁平な底面１０と、接続管７の内径と略同径の円筒部と、上端開口全周囲より外側方向に張り出したフランジ部１１よりなる有底オイルブーツを、該有底オイルブーツのフランジ部を前記接続管の上端に水密に取り付け、前記接続管の内側中空部に吊り下げて配設し、
前記立上げ管から揚水された水がオイルブーツと接続管との隙間に入り込まないように、前記オイルブーツの底面外周と前記接続管の内周面との間には、シール用Ｏリングを設け、
前記立上げ管に揚水導入された流体の圧力が、前記オイルブーツの底部外側に前記立上げ管長さ方向に沿って前記ブルドン管開口固定端方向へ加圧することにより、前記オイルブーツ内のオイルを前記ブルドン管開口固定端からブルドン管内部に導入して前記立上げ管に揚水された測定圧力流体の揚圧を測定可能に、前記オイルブーツの上端開口は前記ブルドン管開口固定端の開口と連通接続されていることを特徴とするブルドン管圧力計。A Bourdon tube having an open fixed end into which a measurement pressure fluid is introduced, and a closed free end that is displaced according to the pressure of the introduced measurement pressure fluid;
A pressure display conversion mechanism that converts the displacement of the closed free end into the rotation of the pointer;
In the Bourdon tube pressure gauge, which is a conduit for the measurement pressure fluid and consists of a riser pipe equipped with a diversion part for diverting the introduced fluid to the Bourdon tube side and the drain port side,
Between the opening fixed end of the Bourdon tube and the Bourdon tube side opening in the flow dividing portion, a connecting tube is connected and connected,
Made of synthetic resin flakes with water resistance, oil resistance, chemical resistance, high elasticity and high flexibility, flat bottom surface 10, cylindrical portion having the same diameter as the inner diameter of connection pipe 7, and the entire circumference of the upper end opening A bottomed oil boot consisting of a flange portion 11 projecting outward is attached to a flange portion of the bottomed oil boot in a watertight manner at the upper end of the connection pipe and suspended from an inner hollow portion of the connection pipe. ,
An O-ring for sealing is provided between the outer periphery of the bottom surface of the oil boot and the inner peripheral surface of the connection pipe so that the water pumped from the riser pipe does not enter the gap between the oil boot and the connection pipe. ,
The pressure of the fluid introduced into the riser pipe pressurizes the oil in the oil boot along the length of the riser pipe along the length of the riser pipe toward the fixed end of the Bourdon tube opening. The upper end opening of the oil boot communicates with the opening of the Bourdon tube opening fixed end so that the pressure of the measured pressure fluid introduced into the Bourdon tube from the fixed end of the Bourdon tube opening and pumped to the rising pipe can be measured. Bourdon tube pressure gauge characterized by being connected.
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