JP3111715U - Cold-resistant water level gauge - Google Patents

Cold-resistant water level gauge Download PDF

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JP3111715U
JP3111715U JP2005002490U JP2005002490U JP3111715U JP 3111715 U JP3111715 U JP 3111715U JP 2005002490 U JP2005002490 U JP 2005002490U JP 2005002490 U JP2005002490 U JP 2005002490U JP 3111715 U JP3111715 U JP 3111715U
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water level
pressure
pressure receiving
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惠一郎 望月
眞澄 小川
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Kyowa Electronic Instruments Co Ltd
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Abstract

【課題】 寒冷地等の凍結し易い河川やダム等における水位を安定的に計測し得ると共に、万一、水圧室に水が浸入してそれが凍結したとしても、水位計が損壊しないようにする。
【解決手段】 河川等の水中に設置された水位計20に対し、その水深に対応した水圧が、連通孔21c、間隙23を順次介してカバー部材21内の空間内に充填された充填液体30に伝達され、その充填液体30を介して水位計の受圧部材を押圧する。万が一、充填液体30が間隙23、連通孔21cを介して一部流出し、代りに、連通孔21cから水が浸入し、その水が凍結したとしても、その凍結時に発生する過大な圧力は、袋状体28に吸収されるため、受圧部材等の損壊は免れる。
【選択図】 図1
PROBLEM TO BE SOLVED: To stably measure a water level in a freezing river or dam such as a cold region, and to prevent a water level meter from being damaged even if water enters a hydraulic chamber and freezes. To do.
SOLUTION: A filling liquid 30 in which a water pressure corresponding to the water depth of a water level gauge 20 installed in water such as a river is filled in a space in a cover member 21 through a communication hole 21c and a gap 23 sequentially. And the pressure receiving member of the water level gauge is pressed through the filling liquid 30. In the unlikely event that the filling liquid 30 partially flows out through the gap 23 and the communication hole 21c, instead of water entering from the communication hole 21c and freezing, the excessive pressure generated at the time of freezing is Since it is absorbed by the bag-like body 28, damage to the pressure receiving member and the like is avoided.
[Selection] Figure 1

Description

本考案は、被測定流体の圧力に応じて変形または変位する受圧部材と、この受圧部材の変形または変位に伴い変形する起歪部と、前記起歪部に添着されたひずみゲージが本体ケース部に設けられた水位計に関し、特に寒冷地における使用に耐え得る耐寒性水位計に関するものである。   The present invention provides a pressure receiving member that is deformed or displaced according to the pressure of a fluid to be measured, a strain generating portion that is deformed in accordance with the deformation or displacement of the pressure receiving member, and a strain gauge that is attached to the strain generating portion. In particular, the present invention relates to a cold-resistant water level meter that can withstand use in cold regions.

従来、河川、貯水池、湖沼等の水圧を検出することによって、これらの水位を測定することのできる水位計としては、種々の型式のものが用いられている。
上記した水位計の原理としては、受圧部材となるベローズ蓋の変位量あるいはダイヤフラムに生じたひずみ量を力伝達棒を介してそのベローズ蓋あるいはダイヤフラムに連結された起歪板に添着したひずみゲージによって、電気的出力に変換して取り出すように構成されている。
例えば、特許文献1(実公平7−10258号公報)には、上述したベローズ蓋を受圧部材とした場合の水位計の従来例が開示されている。
即ち、特許文献1に示す耐寒性水位計は、本体ケース部のフィルタをカバー部材で囲繞すると共に、カバー部材内に不凍液からなる充填液体を満たし、カバー部材の上部に被測定流体の水圧が上記充填液体に印加される連通孔を開口した構成としたので、寒冷地などの凍結し易い流雪溝の水位を監視する水位計に適用しても、伸縮動作する水圧側ベローズが直接、被測定流体と接触することがないため、該水圧側ベローズが凍結して水位計としての機能が損なわれることがなく、正確な水位を安定して測定することが可能となる。
Conventionally, various types of water level meters have been used as water level gauges capable of measuring these water levels by detecting the water pressure of rivers, reservoirs, lakes and the like.
The principle of the above water level meter is that the displacement amount of the bellows lid as a pressure receiving member or the strain amount generated in the diaphragm is measured by a strain gauge attached to the bellows lid or the strain plate connected to the diaphragm via a force transmission rod. The electric output is converted into an electrical output.
For example, Patent Document 1 (Japanese Utility Model Publication No. 7-10258) discloses a conventional example of a water level gauge when the above-described bellows lid is used as a pressure receiving member.
That is, the cold-resistant water level meter shown in Patent Document 1 surrounds the filter of the main body case portion with the cover member, fills the cover member with a filling liquid made of antifreeze, and the water pressure of the fluid to be measured is above the cover member. Since the communication hole applied to the filling liquid is opened, the hydraulic bellows that expands and contracts can be directly measured even if it is applied to a water level gauge that monitors the water level of a snowfall groove that freezes easily in cold regions. Since it does not come into contact with the fluid, the water pressure side bellows is not frozen and the function as a water level gauge is not impaired, and an accurate water level can be measured stably.

図5は、上記特許文献1に開示された耐寒性水位計とほぼ同様の従来技術の一例の構成を示す断面図である。
但し、水位計本体部は、破断して示してはいない。
図5において、本体ケース部1は、下方から順に、フィルタ1a、起歪部ケース1bおよびケーブル引込み用ケース1cから構成されている。
この本体ケース部1のフィルタ1aおよび起歪部ケース1bの外周を、所要の間隔を存して筒状のカバー部材2で囲繞する。カバー部材2の底部には、図示は省略したが、ねじにより上記本体ケース部1の底カバー1dが当接された状態で固定されている。
上記カバー部材2の上部には、円形状の開口部が設けられ、その開口部には、本体ケース部1が次述するシール手段により水密状に結合されている。
即ち、上記カバー部材2の上記開口縁には、内方に向けて突出する引掛座3aを有するリング体3が溶接等により固着されている。このリング体3内には、上下を座金4aと4bとで挟まれた円筒状のゴムブッシュ4が挿入され、上記リング体3の引掛座3aに落とし込まれている。そして、このゴムブッシュ4の一面(図においては、上面)側から締付グランド5が、その外面の雄ねじ5aを、上記リング体3の内面に形成した雌ねじ3bにねじ込まれている。それにより、ゴムブッシュ4は、圧迫されて内外径方向へ膨張し、本体ケース部1の外周面とリング体3内周面に密着され、上記本体ケース部1とリング体3の内周面に密着され、上記本体ケース部1とリング体3間を水密状にシールしている。
FIG. 5 is a cross-sectional view showing a configuration of an example of a conventional technique substantially similar to the cold-resistant water level meter disclosed in Patent Document 1.
However, the water gauge main body is not shown broken.
In FIG. 5, the main body case portion 1 is composed of a filter 1a, a strain generating portion case 1b, and a cable drawing case 1c in order from the bottom.
The outer periphery of the filter 1a and the strain generating part case 1b of the main body case part 1 is surrounded by a cylindrical cover member 2 with a predetermined interval. Although not shown, the bottom cover 1 of the main body case 1 is fixed to the bottom of the cover member 2 in a state where the bottom cover 1d is in contact therewith.
A circular opening is provided in the upper part of the cover member 2, and the main body case 1 is connected to the opening in a watertight manner by sealing means described below.
That is, the ring body 3 having the hook seat 3a protruding inward is fixed to the opening edge of the cover member 2 by welding or the like. A cylindrical rubber bush 4 sandwiched between the top and bottom washers 4 a and 4 b is inserted into the ring body 3 and dropped into the hooking seat 3 a of the ring body 3. A fastening gland 5 is screwed into a female screw 3b formed on the inner surface of the ring body 3 with a male screw 5a on the outer surface from one side (upper surface in the figure) of the rubber bush 4. As a result, the rubber bush 4 is compressed and expands in the inner and outer diameter directions, is in close contact with the outer peripheral surface of the main body case portion 1 and the inner peripheral surface of the ring body 3, and is attached to the inner peripheral surface of the main body case portion 1 and the ring body 3. The main body case 1 and the ring body 3 are sealed in a watertight manner.

そして、カバー部材2内には、水よりも比重が大きな不凍液などの充填液体6を充填してある。上記リング体3のフランジ部3cには、比較的に小さな連通孔3dが穿設され、この連通孔3dを介して被測定流体の水圧が上記充填液6に印加されるようになっている。
被測定流体の水圧は、連通孔3dから充填液体6へ印加される。これによって、上記充填液体6へ印加された圧力は、フィルタ1aを介して水圧室内に臨んでいる水圧側ベローズのベローズ蓋に印加される。つまり、水深に応じた水圧に大気圧が加算された圧力がベローズ蓋に加わり、上述したように、連結ロッドを介して起歪板を撓ませ、そのひずみ量がひずみゲージによって電気信号に変換される。
The cover member 2 is filled with a filling liquid 6 such as an antifreeze liquid having a specific gravity greater than that of water. A relatively small communication hole 3d is formed in the flange portion 3c of the ring body 3, and the water pressure of the fluid to be measured is applied to the filling liquid 6 through the communication hole 3d.
The water pressure of the fluid to be measured is applied to the filling liquid 6 from the communication hole 3d. As a result, the pressure applied to the filling liquid 6 is applied to the bellows lid of the hydraulic side bellows facing the hydraulic chamber through the filter 1a. That is, a pressure obtained by adding atmospheric pressure to the water pressure according to the water depth is applied to the bellows lid, and as described above, the strain plate is bent via the connecting rod, and the strain amount is converted into an electrical signal by the strain gauge. The

実公平7−10258号公報No. 7-10258

上述した従来の耐寒性水位計は、寒冷地(−20℃から−30℃)においても不凍液は凍結しないので、支障なく水位の計測が可能であると考えられていた。しかしながら、ごく稀に水位計の出力に異常値を示したり、場合によっては、水位計自体が損壊する、という事態が生じたが、長い間、その原因が不明であった。
そこで、本考案者らは、その原因を鋭意究明した結果、何らかの原因で、上記カバー部材2の内部に充填していた充填液体6が連通孔3dを介して湧出、または流出し、その湧出した分のスペースに被測定流体である河川等の水が浸入し、その水が凍結しカバー部材2内や水圧室内のオイルの圧力を大きく上昇させる結果、水位計の受圧部材または起歪部、あるいはベローズを損壊させてしまうことが判明した。
水位計は、河川や湖沼等に設置されるものであるが、損壊した水位計を回収することが困難乃至は不可能な場合が多く、また新品の水位計を再設置ことにも困難があり、設置コストが嵩むという問題があった。
The conventional cold-resistant water level meter described above has been considered to be able to measure the water level without hindrance because the antifreeze does not freeze even in cold regions (−20 ° C. to −30 ° C.). However, in rare cases, abnormal values were shown in the output of the water level gauge, or in some cases, the water level gauge itself was damaged, but for a long time the cause was unknown.
Therefore, as a result of earnest investigation of the cause, the present inventors, for some reason, the filling liquid 6 filling the inside of the cover member 2 spills out or flows out through the communication hole 3d and swells. The water in the river, which is the fluid to be measured, enters into the space of the minute, and the water freezes and greatly increases the oil pressure in the cover member 2 and the hydraulic chamber, so that the pressure receiving member or strain generating part of the water level gauge, or It was found that the bellows were damaged.
Water level gauges are installed in rivers, lakes, etc., but it is often difficult or impossible to collect damaged water level gauges, and it is also difficult to reinstall new water level gauges. There was a problem that the installation cost increased.

本考案は、上述した事情に鑑みてなされたもので、その第1の目的とするところは、万が一カバー部材内に被測定流体が浸入し、凍結をした場合でも、水位計自体は何ら損壊するおそれがない耐寒性水位計を提供することにあり、第2の目的とするところは、万が一、カバー部材内で凍結した被測定流体が、水温の上昇により融解した場合には、再び支障なく水位を計測し得る耐寒性水位計を提供することにあり、第3の目的とするところは、簡素な構成で且つ安価な構成でありながら、上記第1および第2の目的を達成し得る耐寒性水位計を提供することにある。   The present invention has been made in view of the above-mentioned circumstances, and the first object thereof is that even if the fluid to be measured enters the cover member and freezes, the water level gauge itself is damaged. The second purpose is to provide a cold-resistant water level meter that has no fear, and if the fluid to be measured frozen in the cover member melts due to an increase in the water temperature, the water level is restored without any problem. The third object of the present invention is to provide a cold-resistant water level meter that can measure the above-described temperature, and to achieve the above first and second objects while having a simple and inexpensive structure. To provide a water level gauge.

請求項1に記載した考案に係る耐寒性水位計は、上述した上記第1〜第3の目的を達成するために、
被測定流体の圧力に応じて変形または変位する受圧部材と、この受圧部材の変形または変位に伴い変形する起歪部と、前記起歪部に添着されたひずみゲージと、本体ケース部に設けられた水位計において、
前記本体ケース部の下方外周を空間を存して囲繞すると共に、前記本体ケース部外周にシール部材を介して水密状に連結固定され、
上方部に前記被測定流体が出入自在な比較的小さな連通孔が穿設されたカバー部材と、
このカバー部材の前記空間内に配設され、前記空間内の過大な圧力を吸収する気体入り袋状体と、
前記空間内に充填された比重が水より大きい液体と、
を備え、
前記連通孔を介して印加される前記被測定流体の圧力を前記液体を介して前記受圧部材で受けて、前記ひずみゲージにより前記被測定流体の圧力を電気信号に変換するように構成したことを特徴としている。
In order to achieve the first to third objects described above, the cold-resistant water level meter according to the invention described in claim 1
A pressure receiving member that is deformed or displaced according to the pressure of the fluid to be measured, a strain generating portion that is deformed in accordance with the deformation or displacement of the pressure receiving member, a strain gauge that is attached to the strain generating portion, and a main body case portion. In the water gauge
Surrounding the lower outer periphery of the main body case portion with a space, and connected and fixed to the outer periphery of the main body case portion in a watertight manner via a seal member,
A cover member in which a relatively small communication hole through which the fluid to be measured can freely enter and exit is formed in an upper part;
A gas-filled bag-like body disposed in the space of the cover member and absorbing excessive pressure in the space;
A liquid with a specific gravity greater than water filled in the space;
With
The pressure of the fluid to be measured applied through the communication hole is received by the pressure receiving member through the liquid, and the pressure of the fluid to be measured is converted into an electrical signal by the strain gauge. It is a feature.

請求項2に記載した考案に係る耐寒性水位計における前記液体は、比重が1.9であるフッ素系オイルであることを特徴としている。
請求項3に記載した考案に係る耐寒性水位計における前記袋状体は、金属製、合成樹脂製およびゴム製のいずれか1つの材質よりなり、内部に所定圧の空気が封入されていることを特徴としている。
請求項4に記載した考案に係る耐寒性水位計における前記本体ケース部には、下端部に被測定流体からの水圧を受ける受圧部材と、この受圧部材で受けた圧力を力に変換して大気圧受圧板に伝達すると共に、起歪部に変位を与える力伝達棒とが設けられていることを特徴としている。
請求項5に記載した考案に係る耐寒性水位計は、前記本体ケース部の大気圧受圧板側の内部には、外部から大気圧を導入するキャピラリチューブが連通するように配設されていることを特徴としている。
請求項6に記載した考案に係る耐寒性水位計は、前記本体ケース部の内壁と前記大気圧受圧板と、前記起歪部と前記力伝達棒とで区画される密閉空間内に、不活性ガスが充填されていることを特徴としている。
The liquid in the cold-resistant water level meter according to the invention described in claim 2 is a fluorine-based oil having a specific gravity of 1.9.
The bag-like body in the cold-resistant water level meter according to the invention described in claim 3 is made of any one of metal, synthetic resin, and rubber, and air of a predetermined pressure is enclosed therein. It is characterized by.
The main body case portion in the cold-resistant water level meter according to the invention described in claim 4 has a pressure receiving member that receives water pressure from the fluid to be measured at the lower end portion, and a pressure received by the pressure receiving member is converted into a force. A force transmission rod that transmits the pressure to the pressure receiving plate and gives displacement to the strain generating portion is provided.
The cold-resistant water level meter according to the invention described in claim 5 is arranged so that a capillary tube for introducing atmospheric pressure from the outside communicates with the inside of the main body case portion on the atmospheric pressure receiving plate side. It is characterized by.
The cold-resistant water level meter according to the invention described in claim 6 is inactive in a sealed space defined by the inner wall of the main body case portion, the atmospheric pressure receiving plate, the strain generating portion, and the force transmission rod. It is characterized by being filled with gas.

本考案によれば、凍結の可能性のある河川や湖沼等の被測定流体の水位を正確に計測し得ることはもとより、カバー部材内に被測定流体が浸入し、凍結したとしても、損壊することがなく、しかも簡素な構成で低コストで製作し得る耐寒性水位計を提供することができる。
すなわち、請求項1に記載の考案によれば、被測定流体の圧力に応じて変形または変位する受圧部材と、この受圧部材の変形または変位に伴い変形する起歪部と、前記起歪部に添着されたひずみゲージと、本体ケース部に設けられた水位計において、
前記本体ケース部の下方外周を空間を存して囲繞すると共に、前記本体ケース部外周にシール部材を介して水密状に連結固定され、上方部に前記被測定流体が出入自在な比較的小さな連通孔が穿設されたカバー部材と、
このカバー部材の前記空間内に配設され、前記空間内の過大な圧力を吸収する気体入り袋状体と、
前記空間内に充填された比重が水より大きい液体と、
を備え、
前記連通孔を介して印加される前記被測定流体の圧力を前記液体を介して前記受圧部材で受けて、前記ひずみゲージにより前記被測定流体の圧力を電気信号に変換するように構成したので、寒冷地等の凍結し易い流雪溝や河川、ダムあるいは貯水池等の水位の測定用や監視用として用いても、凍結することなく水位に正確に対応した電気信号を安定的に得ることができ、また、水位計の設置場所から離れた遠隔地にて集中的に水位の測定が得られることはもとより、特に、カバー部材内に水等が浸入して凍結しても、損壊することを防止し得る耐寒性水位計を安価に提供することができる。
According to the present invention, it is possible to accurately measure the water level of a fluid to be measured such as a river or a lake with a possibility of freezing, and even if the fluid to be measured enters into the cover member and freezes, it is damaged. It is possible to provide a cold-resistant water level meter that can be manufactured at a low cost with a simple configuration.
That is, according to the device of the first aspect, the pressure receiving member that is deformed or displaced according to the pressure of the fluid to be measured, the strain generating portion that is deformed in accordance with the deformation or displacement of the pressure receiving member, and In the attached strain gauge and the water level gauge provided in the main body case,
A relatively small communication that surrounds the lower outer periphery of the main body case portion with a space, is connected and fixed to the outer periphery of the main body case portion in a watertight manner via a seal member, and allows the fluid to be measured to enter and exit the upper portion. A cover member having a hole formed therein;
A gas-filled bag-like body disposed in the space of the cover member and absorbing excessive pressure in the space;
A liquid with a specific gravity greater than water filled in the space;
With
Since the pressure of the fluid to be measured applied through the communication hole is received by the pressure receiving member through the liquid, and the pressure of the fluid to be measured is converted into an electrical signal by the strain gauge, Even if it is used for measuring or monitoring the water level of snow drift grooves, rivers, dams, reservoirs, etc. that are easily frozen in cold regions, it is possible to stably obtain an electrical signal that accurately corresponds to the water level without freezing. In addition, the water level can be measured centrally at a remote location away from the location where the water level gauge is installed, and in particular, it is prevented from being damaged even if water enters the cover member and freezes. A cold-resistant water level meter that can be provided can be provided at low cost.

また、請求項2に記載の考案によれば、前記液体は、比重が1.9であるフッ素系オイルであるので、−20℃〜−30℃の低温下でも凍結することがなく、しかも、水より比重が大きいので、水位を計測する水は、連通孔から多少浸入するが、カバー部材内まで浸入することがなく、この点で、先ず凍結による損壊を防止し得る耐寒性水位計を提供することができる。
また、請求項3に記載の考案によれば、前記袋状体は、金属製、合成樹脂製およびゴム製のいずれか1つの材質よりなり、内部に所定圧の空気が封入されていることを特徴とり、内部に所定圧の空気が封入されているので、構成が簡素で、安価に製作し得るにも拘わらず、万一、カバー部材内に被測定流体である水が浸入し、凍結して体積が膨張することによる過大な圧力を吸収し、損壊を未然に防止し得る耐寒性水位計を提供することができる。
また、請求項4に記載の考案によれば、前記本体ケース部には、下端部に被測定流体からの水圧を受ける受圧部材と、この受圧部材で受けた圧力を力に変換して大気圧受圧板に伝達すると共に、起歪部に変位を与える力伝達棒とが設けられているので、起歪部が受圧部材と、大気圧受圧板との間に配設されて外気と隔絶されており、起歪板に添着されるひずみゲージが、被測定流体および大気と隔絶され、ひずみゲージの絶縁低下や劣化を防止し得る耐寒性水位計を提供することができる。
In addition, according to the invention of claim 2, the liquid is a fluorinated oil having a specific gravity of 1.9, so that it does not freeze even at a low temperature of −20 ° C. to −30 ° C., and Since the specific gravity is greater than that of water, water that measures the water level enters slightly from the communication hole, but does not enter the cover member. In this regard, we first provide a cold-resistant water level meter that can prevent damage due to freezing. can do.
According to a third aspect of the present invention, the bag-like body is made of any one of metal, synthetic resin, and rubber, and air of a predetermined pressure is enclosed therein. Since the air of a predetermined pressure is sealed inside, the structure is simple and it can be manufactured at low cost, but the water to be measured intrudes into the cover member and freezes. Thus, it is possible to provide a cold-resistant water level meter that can absorb excessive pressure due to expansion of the volume and prevent damage in advance.
According to the invention described in claim 4, the main body case portion includes a pressure receiving member that receives water pressure from the fluid to be measured at the lower end portion, and converts the pressure received by the pressure receiving member into force to convert the atmospheric pressure to atmospheric pressure. Since a force transmission rod that transmits to the pressure receiving plate and gives displacement to the strain generating portion is provided, the strain generating portion is disposed between the pressure receiving member and the atmospheric pressure receiving plate to be isolated from the outside air. In addition, the strain gauge attached to the strain generating plate is isolated from the fluid to be measured and the atmosphere, and it is possible to provide a cold-resistant water level meter that can prevent the insulation degradation and deterioration of the strain gauge.

また、請求項5に記載の考案によれば、前記本体ケース部の大気圧受圧板側の内部には、外部から大気圧を導入するキャピラリチューブが連通するように配設されているので、受圧部材には、水深に応じた水圧に大気圧が加算されて印加されるが、キャピラリチューブで大気圧受圧板側にも大気圧を印加する結果、相殺されて水深に応じた水圧を正確に計測し得る耐寒性水位計を提供することができる。
また、請求項6に記載の考案によれば、前記本体ケース部の内壁と前記大気圧受圧板と、前記起歪部と前記力伝達棒とで区画される密閉空間内に、不活性ガスが充填されているので、起歪部に添着されたひずみゲージの酸化や絶縁低下を抑制し得る耐寒性水位計を提供することができる。
According to the fifth aspect of the present invention, since the capillary tube for introducing the atmospheric pressure from the outside communicates with the inside of the main body case portion on the atmospheric pressure receiving plate side, Although the atmospheric pressure is added to the water pressure according to the water depth and applied to the member, it is offset as a result of applying the atmospheric pressure to the atmospheric pressure receiving plate side with the capillary tube, and the water pressure according to the water depth is accurately measured A cold-resistant water level meter can be provided.
Further, according to the invention described in claim 6, an inert gas is contained in a sealed space defined by the inner wall of the main body case portion, the atmospheric pressure receiving plate, the strain generating portion, and the force transmission rod. Since it is filled, it is possible to provide a cold-resistant water level meter that can suppress oxidation of the strain gauge attached to the strain-generating portion and a decrease in insulation.

以下、本考案に係る実施の形態につき、添付図面を参照して詳しく説明する。
図1は、本考案の一つの実施の形態に係る耐寒性水位計(以下、単に「水位計」と称することがある)の断面構成を示す縦断面図である。
図2は、図1の水位計の右半分を破断して示し、左半分を正面図として示す半断面図であり、図3は、図1の水位計の平面図であり、図4は、図1の水位計を構成する水位計本体部の縦断面図である。
先ず、本考案に使用される水位計本体の構成の一例を図4を用いて説明する。
10は、本体ケース部を示し、この本体ケース部10は、上方から下方向にかけて、ケーブル引込み用ケース10aと、このケーブル引込み用ケース10aが下端に連結される起歪部ケース10bと、この起歪部ケース10bの下端に連結される円筒状のフィルタ10cと、このフィルタ10cの開口底部を閉塞し、対向部に位置する後述の受圧部材を保護する底カバー10dとから構成されている。
本体ケース部10には、起歪部ケース10bを境として、その上部に大気圧室Bが形成されると共に、下部に水圧室Aが形成されている。
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a vertical cross-sectional view showing a cross-sectional configuration of a cold-resistant water level meter (hereinafter sometimes simply referred to as “water level meter”) according to one embodiment of the present invention.
2 is a half sectional view showing the right half of the water level meter of FIG. 1 with the right half broken, and the left half as a front view. FIG. 3 is a plan view of the water level meter of FIG. It is a longitudinal cross-sectional view of the water level meter main-body part which comprises the water level meter of FIG.
First, an example of the configuration of the water level gauge main body used in the present invention will be described with reference to FIG.
Reference numeral 10 denotes a main body case section. The main body case section 10 includes a cable retracting case 10a, a strain generating section case 10b to which the cable retracting case 10a is coupled to the lower end, and an A cylindrical filter 10c connected to the lower end of the strainer case 10b, and a bottom cover 10d that closes the bottom of the opening of the filter 10c and protects a pressure receiving member, which will be described later, located at the opposing portion.
The main body case portion 10 is formed with an atmospheric pressure chamber B at the upper portion and a hydraulic pressure chamber A at the lower portion, with the strain generating portion case 10b as a boundary.

上記ケーブル引込み用ケース10aの上部には、図示は省略したが、ケーブル12を圧接保持するケーブルグランドが円周面に形成された雌ねじ部にねじ込まれ、このケーブルグランドの下端には、防水用のパッキン部材が配設され、かつ上記ケーブルグランドによって圧縮されているものとする。
上記ケーブル12内には、大気圧室Bに基準点における大気を導入するためのキャピラリチューブ13および複数の信号線14が共に挿通され、このうち、キャピラリチューブ13は、その基端が大気圧室Bへ導かれている。
また、信号線14は、ケーブル引込み用ケース10a内の避雷対策用の図示しないアレスタに接続されると共に、後述するひずみゲージに接続されている。図示しない上記避雷対策用のアレスタや温度計測用の測温抵抗体は、絶縁抵抗の低下を防ぐために、樹脂によりモールドし保護している。
フィルタ10cは、水圧受圧面を直接的な負荷および水中に含まれる異物から保護する役割を兼ねている。
起歪部ケース10bには、薄肉で可撓性を有する起歪部16aが形成され、この起歪部16の中心部に直交する方向に力伝達棒16bが形成されている。
Although not shown in the drawing, the cable gland for press-holding the cable 12 is screwed into a female threaded portion formed on the circumferential surface, and the lower end of the cable gland is waterproofed. It is assumed that a packing member is disposed and compressed by the cable gland.
A capillary tube 13 and a plurality of signal lines 14 for introducing the atmosphere at the reference point into the atmospheric pressure chamber B are inserted into the cable 12, and among these, the capillary tube 13 has a proximal end at the atmospheric pressure chamber. Guided to B.
The signal line 14 is connected to an arrester (not shown) for lightning protection in the cable lead-in case 10a, and is connected to a strain gauge described later. The arrester for lightning protection not shown and the temperature measuring resistor for temperature measurement are molded and protected with resin in order to prevent the insulation resistance from being lowered.
The filter 10c also serves to protect the water pressure receiving surface from a direct load and foreign matter contained in the water.
In the strain generating part case 10b, a thin and flexible strain generating part 16a is formed, and a force transmission rod 16b is formed in a direction perpendicular to the central part of the strain generating part 16.

この起歪部ケース10bと力伝達棒16bの下端面には、薄肉で可撓性を有する受圧部材15aが、溶接により一体的に気密状に固着されており、起歪部ケース10bと力伝達棒16bの上端面には、薄肉で可撓性を有する大気圧受圧板15bが一体的に気密状に固着されている。
尚、起歪部16aの上面側には、例えば4枚または8枚のひずみゲージ17が接着、蒸着、スパッタリング等の手段により添着されている。図示は省略してあるが、各ひずみゲージ17のゲージタブには、ゲージリードが接続されており、そのゲージリードは、信号線14にそれぞれ接続されるものとする。
そして、信号線14の他端側は、離れた場所に設置されたひずみ測定器、即ち、水位測定器の入出力端に接続され、ブリッジ電源の供給を受けると共に、ひずみゲージの抵抗値変化に伴う出力電圧を導出する。
A thin and flexible pressure receiving member 15a is integrally and airtightly fixed to the lower end surfaces of the strain generating part case 10b and the force transmitting rod 16b by welding so as to transmit force to the strain generating part case 10b. A thin and flexible atmospheric pressure receiving plate 15b is integrally and airtightly fixed to the upper end surface of the rod 16b.
For example, four or eight strain gauges 17 are attached to the upper surface side of the strain generating portion 16a by means such as adhesion, vapor deposition, and sputtering. Although not shown, a gauge lead is connected to the gauge tab of each strain gauge 17, and the gauge lead is connected to the signal line 14, respectively.
The other end of the signal line 14 is connected to an input / output end of a strain measuring device installed at a distant place, that is, a water level measuring device, and is supplied with a bridge power supply, and changes in resistance value of the strain gauge. The accompanying output voltage is derived.

図1は、上述のように構成された水位計を耐寒性水位計に適用した要部の縦断面図であるが、水位計本体部については、断面は示されていない。
図1〜図3において、20は、耐寒性水位計であり、21aは、本体ケース部10のフィルタ10cおよび起歪部ケース10bの外周を所要の間隔を存して囲繞する円筒状のカバーで、その底部には、底板22が嵌合し、その接合部外周が溶接により気密状に固着されている。
底板22には、複数の雌ねじ穴22aが形成されている。
カバー21aの上端縁には、リング体21bが嵌合し、その嵌合部外周が溶接により、気密状に連接されている。
上記カバー21aとリング体21bとからカバー部材21が形成されている。
リング体21bの内周径は、本体ケース部10の外径(ケーブル引込み用ケース10aの外径)よりも僅かに大径に設定されて、両者間には、所定の間隙23が設けられており、リング体21bの外周面から中心方向に向い、上記間隙23に達するように連通孔21cが穿設されている。
リング体21bは、上半部の内径が下半部の内径よりも大径とされて段部21dが形成され、さらに、その上半部の円周面には、雌ねじ部21eが形成されている。
FIG. 1 is a longitudinal sectional view of a main part in which a water level meter configured as described above is applied to a cold-resistant water level meter, but the water level meter main body is not shown in cross section.
1 to 3, 20 is a cold-resistant water level gauge, and 21a is a cylindrical cover that surrounds the outer periphery of the filter 10c and the strain generating part case 10b of the main body case part 10 with a predetermined interval. The bottom plate 22 is fitted to the bottom, and the outer periphery of the joint is fixed in an airtight manner by welding.
A plurality of female screw holes 22 a are formed in the bottom plate 22.
A ring body 21b is fitted to the upper end edge of the cover 21a, and the outer periphery of the fitting portion is connected in an airtight manner by welding.
A cover member 21 is formed from the cover 21a and the ring body 21b.
The inner peripheral diameter of the ring body 21b is set slightly larger than the outer diameter of the main body case portion 10 (the outer diameter of the cable drawing case 10a), and a predetermined gap 23 is provided between the two. A communication hole 21c is formed so as to reach the gap 23 from the outer peripheral surface of the ring body 21b toward the center.
In the ring body 21b, the inner diameter of the upper half is made larger than the inner diameter of the lower half, and a step portion 21d is formed. Further, a female screw portion 21e is formed on the circumferential surface of the upper half. Yes.

リング体21bに本体ケース部10が嵌入された状態において、両者間に形成されるギャップの間の上記段部21dの上に、座金24、ガスケット25および座金26の順に嵌合し、さらに締め付けグランド27の外周に形成された雄ねじ部27aを、リング体21bの内周に形成された雌ねじ部21eに螺合し、強く締め付けることで、上記ガスケット25が圧迫されて内外径方向へ膨張し、本体ケース部10の外周面とリング体21bの内周面に密着され、上記本体ケース部10とリング体21b間を水密的にシールしている。
締め付けグランド27の上端部には、吊り下げ用ワイヤ固定ねじ穴27bが形成されている。
リング体21bの一部には、気体(不活性ガス、空気等)を封入した袋状体28を配設するための収納部29が形成されている。この袋状体28は、例えば、金属製、合成樹脂製およびゴム製のいずれでも用いることができ、例えば、金属製や合成樹脂製のものにあって、下端のみ開口されたチューブ状を呈したものを用いることができる。
上記カバー部材21のカバー21a内には、水よりも比重の大きな液体、例えば、比重が1.9のフッ素系オイルなどの充填液体30を充填してある。
In the state where the main body case portion 10 is fitted in the ring body 21b, the washer 24, the gasket 25, and the washer 26 are fitted in this order on the stepped portion 21d between the gaps formed therebetween, and further, the fastening gland 27, the external thread portion 27a formed on the outer periphery of the ring body 27 is screwed into the internal thread portion 21e formed on the inner periphery of the ring body 21b, and is tightened tightly. The outer peripheral surface of the case portion 10 and the inner peripheral surface of the ring body 21b are in close contact with each other, and the space between the main body case portion 10 and the ring body 21b is sealed in a watertight manner.
A suspension wire fixing screw hole 27 b is formed at the upper end of the fastening gland 27.
In a part of the ring body 21b, there is formed a storage portion 29 for disposing a bag-like body 28 enclosing a gas (inert gas, air, etc.). The bag-like body 28 can be made of, for example, metal, synthetic resin, or rubber. For example, the bag-like body 28 is made of metal or synthetic resin, and has a tube shape with only the lower end opened. Things can be used.
The cover 21a of the cover member 21 is filled with a liquid having a specific gravity greater than that of water, for example, a filling liquid 30 such as a fluorinated oil having a specific gravity of 1.9.

上述の如き構成からなる本考案に係る耐寒性水位計の作用につき説明する。
先ず、水位計20の吊り下げ用ワイヤ固定ねじ穴27bに図示しない吊り下げ用ワイヤ固定ねじを螺合し、吊り下げ用ワイヤを水位計20に連結する。
吊り下げ用ワイヤに吊り下げられた水位計は、被測定対象としての河川の、例えば流雪溝の所定深さ位置に設置される。
この際、ケーブル12は、地上の離れた地点に設置された計測器に導かれる。
水位計20が設置された個所から水面までの高さ(深さ)に対応する被測定流体の水圧は、カバー部材21(リング体21b)の連通孔21c、間隙23を介して充填液体30へ印加される。これによって上記充填液体30へ印加された圧力は、フィルタ10cを介して水圧室A内に臨んでいる受圧部材15aに印加される。
つまり、水深に応じた水圧に大気圧が加算された圧力が受圧部材15aに加わる。
The operation of the cold-resistant water level meter according to the present invention having the above-described configuration will be described.
First, a suspension wire fixing screw (not shown) is screwed into the suspension wire fixing screw hole 27 b of the water level gauge 20, and the suspension wire is connected to the water level gauge 20.
The water level meter suspended from the suspension wire is installed at a predetermined depth position of a river to be measured, for example, a snow drift groove.
At this time, the cable 12 is guided to a measuring instrument installed at a remote point on the ground.
The water pressure of the fluid to be measured corresponding to the height (depth) from the place where the water level gauge 20 is installed to the water surface is transferred to the filling liquid 30 through the communication hole 21c and the gap 23 of the cover member 21 (ring body 21b). Applied. Accordingly, the pressure applied to the filling liquid 30 is applied to the pressure receiving member 15a facing the water pressure chamber A through the filter 10c.
That is, a pressure obtained by adding the atmospheric pressure to the water pressure corresponding to the water depth is applied to the pressure receiving member 15a.

一方、大気圧室Bにもキャピラリチューブ13を介して大気圧が導入されているため、大気圧受圧板15bには、大気圧が負荷されている。その結果、大気圧の変化に拘わらず、水深に対応した水圧によって水圧側の受圧部材15aは、押圧されて上方に弧状に変形し力伝達棒16bを押し上げる。この変位は、起歪部16aにも伝達され、起歪部16aを変形させ、そのひずみ量がひずみゲージ17によって電気信号に変換される。ひずみ量は、圧力水頭、すなわち水面から水圧側の受圧部材15aまでの水深に比例する。従って、ひずみゲージ17によって構成されるホイートストンブリッジ(図示せず)の入力端にブリッジ電源を供給すれば、該ホイートストンブリッジの出力端から所望の深さの水位に対応した電気信号を、ケーブル12等を介して地上に導出することができる。
上述したように、本考案による耐寒性水位計20は、本体ケース部10のフィルタ10cをカバー部材21のカバー21aで囲繞すると共に、カバー部材21内に水よりも比重の大きな液体からなる充填液体30を満たし、カバー部材21(リング体21b)の上部に被測定流体の水圧が上記充填液体30に印加される連通孔21cおよび間隙23を形成した構成としたので、寒冷地などの凍結し易い流雪溝等の水位を監視する水位計に適用しても、変形動作する受圧部材15aが直接、被測定流体と接触することがないため、該受圧部材15aが凍結して水位計としての機能が損なわれることがなく、正確な水位を安定して測定することが可能となる。
On the other hand, since the atmospheric pressure is also introduced into the atmospheric pressure chamber B through the capillary tube 13, the atmospheric pressure is loaded on the atmospheric pressure receiving plate 15b. As a result, regardless of the change in the atmospheric pressure, the pressure receiving member 15a on the hydraulic pressure side is pressed by the water pressure corresponding to the water depth and deformed upward in an arc shape to push up the force transmission rod 16b. This displacement is also transmitted to the strain generating portion 16a, deforms the strain generating portion 16a, and the strain amount is converted into an electrical signal by the strain gauge 17. The amount of strain is proportional to the pressure head, that is, the water depth from the water surface to the pressure receiving member 15a on the water pressure side. Therefore, if a bridge power supply is supplied to the input end of a Wheatstone bridge (not shown) constituted by the strain gauge 17, an electrical signal corresponding to a water level at a desired depth is output from the output end of the Wheatstone bridge to the cable 12 or the like. Can be derived to the ground.
As described above, the cold-resistant water level meter 20 according to the present invention surrounds the filter 10c of the main body case 10 with the cover 21a of the cover member 21, and fills the cover member 21 with a liquid having a specific gravity greater than that of water. 30 and a communication hole 21c and a gap 23 are formed in the upper part of the cover member 21 (ring body 21b) so that the water pressure of the fluid to be measured is applied to the filling liquid 30. Even if it is applied to a water level gauge that monitors the water level of a snow drift groove or the like, the pressure receiving member 15a that is deformed does not come into direct contact with the fluid to be measured, so the pressure receiving member 15a freezes and functions as a water level gauge. Therefore, it is possible to stably measure the accurate water level.

ところで、水位計20が、運搬時、設置時、あるいは、河川等に設置稼動中に木片やくずなどの流動物が水位計に当たるなどして、水位計20が傾いたりしたときに、充填液体30がカバー部材21内から間隙23、連通孔21cを介して逆流して外部に流出した場合には、カバー部材21内に充填液体30が流出した部分に、被測定流体(水)が流入することになる。
すると、寒冷時に、カバー部材21内の上部に浸入した水が凍結し、カバー部材21内の圧力が過大に上昇する。
しかしながら、本考案に係る水位計20は、カバー部材21内に圧縮性気体が充填された袋状体28が配設されているため、過大な圧力は、袋状体28に吸収され、受圧部材15aには、過大な圧力は負荷されない。
従って、このような事態になっても水位計20を構成する受圧部材15a、起歪部16a、大気圧受圧板15bは、損壊から免れる。
By the way, when the water level gauge 20 is tilted due to a fluid such as a piece of wood or litter hitting the water level gauge during transportation, installation, or installation and operation in a river or the like, the filling liquid 30 When the liquid flows back to the outside through the gap 23 and the communication hole 21c from the inside of the cover member 21, the fluid to be measured (water) flows into the portion where the filling liquid 30 flows into the cover member 21. become.
Then, at the time of cold, the water that has entered the upper part of the cover member 21 freezes, and the pressure in the cover member 21 increases excessively.
However, in the water level gauge 20 according to the present invention, since the bag-like body 28 filled with the compressible gas is disposed in the cover member 21, excessive pressure is absorbed by the bag-like body 28 and the pressure-receiving member. No excessive pressure is applied to 15a.
Accordingly, even if such a situation occurs, the pressure receiving member 15a, the strain generating portion 16a, and the atmospheric pressure receiving plate 15b that constitute the water level gauge 20 are free from damage.

本考案によれば、このように、不用意にカバー部材21内に水などが浸入してそれが凍結しても、受圧部材15a等の損壊を未然に防止することができると共に、被測定流体の水温が上昇し、凍結状態から溶解状態になれば何ら特別の修理や復旧作業を必要とすることなく、水位観測を引続き行うことができる。
また、本考案に係る水位計20は、フィルタ10cを囲繞しているカバー21aには、比較的小さな連通孔が開いているだけであるため、たとえ、水中に汚泥、岩石、ゴム等の異物が含有した環境に設置されても、これら異物はカバー部材21内の充填液体30中に浸入することもない。従って、異物がフィルタ10cを通過して水圧室Aに入り、受圧部材15aに付着することによって受圧部材15aの動作が妨げられるという不都合は生じない。
尚、本考案は、上述した実施の形態のみに限定されるものではなく、その要旨を逸脱しない範囲内で種々の変形実施が可能である。
例えば、水位計本体部において、水位の検知手段として、受圧部材15aと大気圧受圧板15bを力伝達棒16bで連結した構成としたものを用いたが、受圧部材15aと大気圧受圧板15bとの間にベローズを介在させた構成としてもよい。
また、上述した実施の形態では、起歪部16aとして、ダイアフラム型のものの例を示したが、基端が起歪部ケース10bに固定され、自由端側が力伝達棒16bに連結したカンチレバー型のものを用いてもよい。
According to the present invention, even when water or the like inadvertently enters the cover member 21 and freezes, the pressure receiving member 15a and the like can be prevented from being damaged and the fluid to be measured can be prevented. If the water temperature rises from the frozen state to the melted state, water level observation can be continued without requiring any special repair or restoration work.
Moreover, since the water level gauge 20 according to the present invention has only a relatively small communication hole in the cover 21a surrounding the filter 10c, foreign matter such as sludge, rocks, rubber, etc. is in the water. Even if it is installed in the contained environment, these foreign substances do not enter the filling liquid 30 in the cover member 21. Therefore, there is no inconvenience that the foreign matter passes through the filter 10c and enters the water pressure chamber A and adheres to the pressure receiving member 15a, thereby hindering the operation of the pressure receiving member 15a.
In addition, this invention is not limited only to embodiment mentioned above, A various deformation | transformation implementation is possible within the range which does not deviate from the summary.
For example, in the main body of the water level gauge, as the means for detecting the water level, a structure in which the pressure receiving member 15a and the atmospheric pressure receiving plate 15b are connected by the force transmission rod 16b is used, but the pressure receiving member 15a and the atmospheric pressure receiving plate 15b are used. It is good also as a structure which interposed the bellows between these.
In the above-described embodiment, an example of a diaphragm type is shown as the strain generating portion 16a. However, a cantilever type having a base end fixed to the strain generating portion case 10b and a free end connected to the force transmission rod 16b is shown. A thing may be used.

本考案の一つの実施の形態に係る耐寒性水位計の断面構成を示す縦断面図である。It is a longitudinal cross-sectional view which shows the cross-sectional structure of the cold-resistant water level meter which concerns on one embodiment of this invention. 図1の水位計の右半分を破断して示し、左半分を正面外観を示す半断面図である。FIG. 2 is a half sectional view showing the right half of the water level meter of FIG. 図1の水位計を上面から見た平面図である。It is the top view which looked at the water level meter of FIG. 1 from the upper surface. 図1の水位計を構成する水位計本体部の断面構成を示す縦断面図である。It is a longitudinal cross-sectional view which shows the cross-sectional structure of the water level meter main-body part which comprises the water level meter of FIG. 従来の耐寒性水位計の構成を示す断面図である。It is sectional drawing which shows the structure of the conventional cold-resistant water level meter.

符号の説明Explanation of symbols

10 本体ケース部
10a ケーブル引込み用ケース
10b 起歪部ケース
10c フィルタ
10d 底カバー
12 ケーブル
13 キャピラリチューブ
14 信号線
15a 受圧部材
15b 大気圧受圧板
16a 起歪部
16b 力伝達棒
17 ひずみゲージ
20 耐寒性水位計
21 カバー部材
21a カバー
21b リング体
21c 連通孔
21d 段部
21e 雌ねじ部
22 底板
23 間隙
24,26 座金
25 ガスケット
27 締め付けグランド
28 袋状体
29 収納部
30 充填液体
DESCRIPTION OF SYMBOLS 10 Main body case part 10a Cable drawing case 10b Strain generation part case 10c Filter 10d Bottom cover 12 Cable 13 Capillary tube 14 Signal line 15a Pressure receiving member 15b Atmospheric pressure receiving plate 16a Strain generation part 16b Force transmission rod 17 Strain gauge 20 Cold resistant water level Total 21 Cover member 21a Cover 21b Ring body 21c Communication hole 21d Step part 21e Female thread part 22 Bottom plate 23 Gap 24, 26 Washer 25 Gasket 27 Tightening gland 28 Bag-like body 29 Storage part 30 Filling liquid

Claims (6)

被測定流体の圧力に応じて変形または変位する受圧部材と、この受圧部材の変形または変位に伴い変形する起歪部と、前記起歪部に添着されたひずみゲージと、本体ケース部に設けられた水位計において、
前記本体ケース部の下方外周を空間を存して囲繞すると共に、前記本体ケース部外周にシール部材を介して水密状に連結固定され、
上方部に前記被測定流体が出入自在な比較的小さな連通孔が穿設されたカバー部材と、
このカバー部材の前記空間内に配設され、前記空間内の過大な圧力を吸収する気体入り袋状体と、
前記空間内に充填された比重が水より大きい液体と、
を備え、
前記連通孔を介して印加される前記被測定流体の圧力を前記液体を介して前記受圧部材で受けて、前記ひずみゲージにより前記被測定流体の圧力を電気信号に変換するように構成したことを特徴とする耐寒性水位計。
A pressure receiving member that is deformed or displaced according to the pressure of the fluid to be measured, a strain generating portion that is deformed in accordance with the deformation or displacement of the pressure receiving member, a strain gauge that is attached to the strain generating portion, and a main body case portion. In the water gauge
Surrounding the lower outer periphery of the main body case portion with a space, and connected and fixed to the outer periphery of the main body case portion in a watertight manner via a seal member,
A cover member in which a relatively small communication hole through which the fluid to be measured can freely enter and exit is formed in an upper part;
A gas-filled bag-like body disposed in the space of the cover member and absorbing excessive pressure in the space;
A liquid with a specific gravity greater than water filled in the space;
With
The pressure of the fluid to be measured applied through the communication hole is received by the pressure receiving member through the liquid, and the pressure of the fluid to be measured is converted into an electrical signal by the strain gauge. Features a cold-resistant water level gauge.
前記液体は、比重が1.9であるフッ素系オイルであることを特徴とする請求項1に記載の耐寒性水位計。 The cold-resistant water level meter according to claim 1, wherein the liquid is a fluorinated oil having a specific gravity of 1.9. 前記袋状体は、金属製、合成樹脂製およびゴム製のいずれか1つの材質よりなり、内部に所定圧の空気が封入されていることを特徴とする請求項1に記載の耐寒性水位計。 The cold-resistant water level meter according to claim 1, wherein the bag-like body is made of any one of metal, synthetic resin, and rubber, and air of a predetermined pressure is sealed therein. . 前記本体ケース部には、下端部に被測定流体からの水圧を受ける受圧部材と、この受圧部材で受けた圧力を力に変換して大気圧受圧板に伝達すると共に、起歪部に変位を与える力伝達棒とが設けられていることを特徴とする請求項1〜3のいずれか1項に記載の耐寒性水位計。 The main body case has a pressure receiving member that receives water pressure from the fluid to be measured at the lower end, converts the pressure received by the pressure receiving member into a force, transmits the force to the atmospheric pressure receiving plate, and displaces the strain generating portion. The cold-resistant water level meter according to any one of claims 1 to 3, wherein a force transmission rod is provided. 前記本体ケース部の大気圧受圧板側の内部には、外部から大気圧を導入するキャピラリチューブが連通するように配設されていることを特徴とする請求項1〜4のいずれか1項に記載の耐寒性水位計。 The inside of the said main body case part by the side of the atmospheric pressure receiving plate is arrange | positioned so that the capillary tube which introduces atmospheric pressure from the outside may be connected. The cold-resistant water level meter as described. 前記本体ケース部の内壁と前記大気圧受圧板と、前記起歪部と前記力伝達棒とで区画される密閉空間内に、不活性ガスが充填されていることを特徴とする請求項4に記載の耐寒性水位計。 The inert gas is filled in the sealed space defined by the inner wall of the main body case portion, the atmospheric pressure receiving plate, the strain generating portion, and the force transmission rod. The cold-resistant water level meter as described.
JP2005002490U 2005-04-20 2005-04-20 Cold-resistant water level gauge Expired - Fee Related JP3111715U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015219103A (en) * 2014-05-16 2015-12-07 株式会社東芝 Immersion type water level gauge calibration system, calibration method thereof, calibration program thereof, and immersion type water level gauge with calibration function
JP2017137811A (en) * 2016-02-03 2017-08-10 株式会社酉島製作所 Horizontal shaft pump
CN113108863A (en) * 2020-01-10 2021-07-13 横河电机株式会社 Liquid level indicator with protective cover

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015219103A (en) * 2014-05-16 2015-12-07 株式会社東芝 Immersion type water level gauge calibration system, calibration method thereof, calibration program thereof, and immersion type water level gauge with calibration function
JP2017137811A (en) * 2016-02-03 2017-08-10 株式会社酉島製作所 Horizontal shaft pump
CN113108863A (en) * 2020-01-10 2021-07-13 横河电机株式会社 Liquid level indicator with protective cover
JP2021110634A (en) * 2020-01-10 2021-08-02 横河電機株式会社 Water gauge with protective cover
JP7192804B2 (en) 2020-01-10 2022-12-20 横河電機株式会社 Water level gauge with protective cover
CN113108863B (en) * 2020-01-10 2024-06-07 横河电机株式会社 Liquid level indicator with protective cover

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