JPS59102121A - Sealing structure in cable winding apparatus for winding type liquid level meter - Google Patents

Abstract

PURPOSE:To prevent gas leakage in a tank and to transmit rotary torque to the outside accurately, by forming an airtight chamber by a pair of sealing members in a tube body, through which a rotary shaft of a winding mechanism pierces, and filling the chamber with a high pressure inactive gas. CONSTITUTION:A rotary shaft 8 is made to pierce through a tube body 12 and a lid 13, which are attached to a winding mechanism casing 5 of a winding type liquid level measuring apparatus. An airtight chamber 16 is formed by a pair of sealing members 15a and 15b in the tube body 12. A high pressure inactive gas is supplied and filled in the chamber through a gas inlet port 17. When the sealing member 15a becomes defective, the inactive gas may flow into the casing 5, but the leakage of the liquefied gas of LPG and the like in a tank to the outside is prevented. Meanwhile, the rotary torque of the rotary shaft 8 can be transmitted to an outside linking mechanism accurately.

Description

【発明の詳細な説明】 各種液体を貯蔵するタンクの中には、タンクを外気に対
して気密構造とし、液が気化して生じるガスが外気に放
出されないようにしたものが少なくない。−例をあげれ
ば、液化ガス（ＬＰＧなど）用の高圧タンク、低温タン
クなどがある。DETAILED DESCRIPTION OF THE INVENTION Among tanks for storing various types of liquids, there are many tanks that have an airtight structure against the outside air so that gas generated by vaporization of the liquid is not released into the outside air. - Examples include high-pressure tanks and low-temperature tanks for liquefied gases (such as LPG).

フロートまたはディスプレーサを液面に追従させ、液面
の上下に応じてテープまたはワイヤを巻き取ったり巻き
戻すことによりテープの移動量を回転角に変換して液位
を測定する、（・わゆる１１巻取式液面計１１を前記の
ような気密タンクへ取り付けるばあい、第１図に示すよ
うにフロートまたはディスプレーサ２を吊り下げて℃・
るテープまたはワイヤ３の巻取機構部４はタンク１内と
ガイドバイブロにて連通ずるケース５内に設けられる。The liquid level is measured by making a float or displacer follow the liquid level and winding or unwinding the tape or wire depending on the rise and fall of the liquid level, converting the amount of tape movement into a rotation angle (so-called 11). When installing the retractable liquid level gauge 11 in an airtight tank such as the one described above, suspend the float or displacer 2 as shown in Fig. 1.
A winding mechanism 4 for the tape or wire 3 is provided in a case 5 that communicates with the tank 1 through a guide vibro.

したがって液位の指示機構、サーボモータによる巻取機
構の駆動装置、液位信号の発信機構など、巻取機構と回
転軸を介して連動する装置を有する巻取式液面計におい
ては、気密構造の回転軸によって両者を連動させる必要
がある。Therefore, in a retractable liquid level gauge that has devices that interlock with the retracting mechanism via a rotating shaft, such as a liquid level indicating mechanism, a drive device for the retracting mechanism using a servo motor, and a liquid level signal transmitting mechanism, an airtight structure is required. It is necessary to link the two using the rotating shaft.

現在気密構造をもった回転軸にはつぎ０２種類があり、
目的に応じて使い分けらｎている。Currently, there are two types of rotating shafts with an airtight structure:
It is used depending on the purpose.

（１）第２図に示すように、シール用ノーウジング７を
貫通する回転軸８の外周の一部を鏡面仕上げとし、この
部分に軸シール用パツキン９を設けて気密を保持する構
造のもの （２）第３図のように、入力軸たる巻取機構軸８ａと出
力軸たる連動機構軸８ｂとを磁石ｉｏａ　、　１０ｂに
よって磁気結合せしめ、かつ巻取機構部と連動機構との
間に隔壁１１を設けて気密構造としたもの 上記（１）の場合、巻取機構の回転角は正確に連動機構
に伝達されるが、貫通軸外周はシールパツキンに対して
摺動するので、経年とともに軸またはパツキンが磨耗し
、シール不良によるガス洩れが発生ずる可能性がある。(1) As shown in Fig. 2, a part of the outer periphery of the rotary shaft 8 that passes through the seal nousing 7 is mirror-finished, and a shaft seal packing 9 is provided on this part to maintain airtightness ( 2) As shown in FIG. 3, the winding mechanism shaft 8a, which is the input shaft, and the interlocking mechanism shaft 8b, which is the output shaft, are magnetically coupled by magnets IOA and 10b, and there is a partition wall 11 between the winding mechanism section and the interlocking mechanism. In the case of (1) above, the rotation angle of the winding mechanism is accurately transmitted to the interlocking mechanism, but since the outer periphery of the through shaft slides against the seal packing, the shaft or The gasket may wear out and gas leakage may occur due to poor sealing.

一般に気密タンクのガス洩れは非常に危険なので、磨耗
状態を常に監視し、必要に応じてシール部の部品を交換
するが、外部からはシール部の状況を目視できないため
、安全を考えて早目に交換を行なっているのが実状であ
る。Generally speaking, gas leaks from airtight tanks are very dangerous, so the wear condition should be constantly monitored and seal parts replaced if necessary. However, since the condition of the seal parts cannot be visually checked from the outside, it is necessary to do so as soon as possible for safety reasons. The reality is that they are being exchanged.

（２）の場合には隔壁が破れないかぎりシール不良にな
ることはないので、シール部の点検、保守の点では（１
）よりも優れているが、巻取機構の回転角の伝達面では
、ズレや遊びがあるために精度が悪く、液位指示や発信
機構を連動させる場合に精度上の問題が生じやすい。ま
た伝達できるトルクも小さい。In the case of (2), there will be no seal failure unless the bulkhead is torn, so in terms of inspection and maintenance of the seal, (1)
), but the accuracy is poor due to misalignment and play in the transmission of the rotation angle of the winding mechanism, and accuracy problems tend to occur when the liquid level indication and transmission mechanism are linked. Also, the torque that can be transmitted is small.

本発明の目的は、上記（１）の欠点であるガス洩れの可
能性と、（２）の欠点である伝達精度、トルク等の問題
を改善した気密構造をもった回転軸を提供することにあ
り、以下本考案を第４図以降の実施例図により説明する
。The purpose of the present invention is to provide a rotating shaft with an airtight structure that improves the above-mentioned drawbacks (1), which is the possibility of gas leakage, and (2), which improves the problems of transmission accuracy, torque, etc. The present invention will be explained below with reference to FIG. 4 and subsequent embodiments.

第４図は本発明のものの基本構成を示す。FIG. 4 shows the basic configuration of the present invention.

この構成のものでは、巻取機構の回転軸は、符号８で示
すように前記（１）のばあいと同様に貫通軸としである
。In this configuration, the rotating shaft of the winding mechanism is a through shaft, as shown by reference numeral 8, as in the case (1) above.

すなわち、巻取機構収納ケーシング５の外側に一端のフ
ランジ１２ａを取り付けた筒体１２と、この筒体の他端
７ランジ１２ｂへ取り付けた蓋（至）とよりなるシール
用ハウジング１４を巻取機構の回転軸８が貫通している
。したがって巻取機構の回転は他の連動機構部へ正確に
伝達される。That is, the sealing housing 14, which consists of a cylinder body 12 with a flange 12a attached at one end attached to the outside of the winding mechanism storage casing 5, and a lid attached to the flange 12b at the other end of the cylinder body, is attached to the winding mechanism. A rotating shaft 8 passes through it. Therefore, the rotation of the winding mechanism is accurately transmitted to the other interlocking mechanisms.

気密保持に関しては、前記筒体１２内に１対のシール材
１５ａ、１５ｂを筒体の軸線方向に設けて両シール材１
５ａと１５ｂ間に気密室１６を形成し７、この気密室１
６内へ、筒体１２に設ゆたガス口１７より不活性ガスを
送入して充満せしめて、気密室内のガス圧をケーシング
内の圧力よりも高くしたものとしである。Regarding airtightness, a pair of sealing materials 15a and 15b are provided in the cylinder body 12 in the axial direction of the cylinder body, and both sealing materials 1
An airtight chamber 16 is formed between 5a and 15b, and this airtight chamber 1
6 is filled with an inert gas from a gas port 17 provided in the cylinder 12, and the gas pressure in the airtight chamber is made higher than the pressure in the casing.

なお気密室１６は、シール材１５ａ、１５ｂの対向面側
に１対の環状体ＩＢａ、１８ｂを設け、両層状体１８ａ
。Note that the airtight chamber 16 is provided with a pair of annular bodies IBa and 18b on opposite surfaces of the sealing materials 15a and 15b, and both layered bodies 18a
.

１８ｂ間に圧縮ばね１９を介設せしめて形成すればよい
。It may be formed by interposing a compression spring 19 between 18b.

また、不活性ガスはタンク内のガスに対して不活性であ
ればよ（、通常は安価な窒素ガスなどでよい。In addition, the inert gas only needs to be inert to the gas in the tank (normally, inexpensive nitrogen gas or the like is sufficient.

気密室に充４されるガスは、気密室の気密性が損なわれ
た際にも内圧をある程度維持できるような供給源により
供給される。具体的には第５図（ａ）のように調圧弁２
０を介して高圧ボンベ２１によりガスを供給するか、同
図（ｂ）のように容量の大きい供給源たる加圧タンク２
２からそれぞれ導管２３によってガスを供給すればよい
。The gas filled in the airtight chamber is supplied from a source that can maintain the internal pressure to some extent even when the airtightness of the airtight chamber is impaired. Specifically, as shown in Fig. 5(a), the pressure regulating valve 2
The gas is supplied from a high-pressure cylinder 21 through the gas tank 2, or a pressurized tank 2, which is a large-capacity supply source, as shown in FIG.
2 through conduits 23, respectively.

本発明のものの構造においては、ケーシング内と気密室
間のシール材１５ａが不良となると、気密室に充満して
いるガスはケーシング内に流入するが、ケーシング内ガ
スが大気中に放出されることはない。In the structure of the present invention, if the sealing material 15a between the inside of the casing and the airtight chamber becomes defective, the gas filling the airtight chamber will flow into the casing, but the gas inside the casing will be released into the atmosphere. There isn't.

また、気密室と大気間のシール材１５ｂが不良となった
場合には、気密室内の充満ガスは、大気中に洩れるが、
タンク内のガスは外部に洩れることはない。Furthermore, if the sealing material 15b between the airtight chamber and the atmosphere becomes defective, the gas filling the airtight chamber will leak into the atmosphere.
Gas inside the tank will not leak to the outside.

売場ガスは第５図のような方法である程度の時間は補充
されるので、洩れ量が比較的小さいならば、かなりの時
間は売場ガスがケーシング内あるいは大気中に洩れるの
みで、ケーシング内の、すなわちタンク内のガスが大気
中に放出される可能性はない。The sales floor gas is replenished for a certain amount of time using the method shown in Figure 5, so if the amount of leakage is relatively small, the sales floor gas will only leak into the casing or into the atmosphere for a considerable period of time, and the That is, there is no possibility that the gas in the tank will be released into the atmosphere.

したがって、気密室内に充領されたガスの洩れを検知し
て警報を発する装置を付加し、この警報によって液面計
のシャットオフバルブをすみやかに閉じれば、タンク内
ガスの犬気放屯の可能性をほとんどゼロにすることがで
きる。Therefore, if a device is added that detects the leakage of the gas filled in the airtight chamber and issues an alarm, and the shutoff valve of the liquid level gauge is immediately closed in response to this alarm, it is possible to release the gas in the tank. can be reduced to almost zero.

売場ガスの洩れを検出するためには、第６図のように、
ガス供給ライン２３に流量検出器２５を取り付げればよ
い。To detect gas leaks in the sales floor, as shown in Figure 6,
A flow rate detector 25 may be attached to the gas supply line 23.

また、第５図（ａ）のようにボンベで売場ガスの供給を
行なう場合には、ボンベに圧力検知器２４を設けて、圧
力が規定値以下となると警報を発するようにするのが簡
単である。Furthermore, when supplying sales floor gas using cylinders as shown in Fig. 5(a), it is easy to install a pressure detector 24 in the cylinder so that it will issue an alarm when the pressure falls below a specified value. be.

以上のように本発明によれば、巻取機構の回転角変位の
伝達が正確に行なわれる貫通軸方式の長所を生かし、タ
ンク内ガスの大気中への洩れをはｙ完全に予防すること
ができる。As described above, according to the present invention, it is possible to completely prevent the gas inside the tank from leaking into the atmosphere by taking advantage of the through-shaft method that accurately transmits the rotational angular displacement of the winding mechanism. can.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は巻取式液面測定装置の略図、第２図及び第３図
は従来の軸封装置の各断面図、第４図は本発明に係る軸
封装置の断面図、第５図（ａ）。 （ｂ）はガス供給装置図、第６図はガス洩れ検知器を設
けたガス供給装置図である。 図中 １　タンク　　　　２　液面感得体たるフコート３　テ
ープ　　　　　４　テープ巻取機構５　　巻取機構のケ
ーシング８　　回転軸１２筒体　　１３蓋 １４ハウジング　　１５ａ、１５ｂ　　シール材１６　
　気密室　　　　　１７　　ガス入口１８ａ、１８ｂ　
環状体　　　　１９　　圧縮ばね２０　　調圧弁　　　
　２１　　ボンベ２２　　加圧タンク　　　２３　　ガ
ス供給ライン２４　　圧力計　　　　２５　　流量計出
願人　東京計装株式会社 代理人　　弁理士　前　１）清　美 第６閃 ５ 手続補正書 特許庁長官　若杉和夫殿 １　事件の表示 昭和５７年　特　許　願第２１２８６８号３　補正をす
る者 ４１件との関係　　出願人 住　　　１カ Ｌに”８（名称）東京計装株式会社 ５、　補正命令の日付　　　自発 別紙記載の通り 補正の内容 （１）　　明細書中、特許請求の範囲の項の記載を次の
とおり訂正する。 ［（１）　　タンク内の液面感得体に接続されたテープ
やワイヤ等の索条を巻き取りま たは巻き戻すための巻取機構を収納し たケーシングの一側部にシール用ハウ ワイヤの移動量を回転角に変換する回 転軸をケーシングから前記ハウジング を貫通せしめて大気中に突出せしめ、 かつ前記ハウジング内に、回転軸の軸 線方向で相対峙する１対のシール材を 設げて両シール材間に気密室を形成し、この気密室内へ
タンク内のガスに対し て不活性で、しかもタンク内のガス圧 よりも高圧な不活性ガスを充填せしめ たことを特徴とする巻取式液面計用の 索条巻取装置におけるシール構造。 （２）　　タンク内の液面感得体に接続されたテープや
ワイヤ等の索条を巻き取りま たは巻き戻すための卯＝≠巻取機構を 収納したケーシングの一側部にシール またはワイヤの移動量を回転角に変換 する回転軸をケーシングから前記ハウ ジングを貫通せしめて大気中に突出せ しめ、かつ前記ハウジング内に、回転 軸の軸線方向で相対峙″１″る１対のシール材を設けて
両シール材間に気密室を 形成し、この気密室内へタンク内のガ スに対して不活性で、しかもタンク内 のガス圧よりも高圧な不活性ガスを充 填せしめ、かつ前記気密室への不活性 ガス供給ラインに、ガス供給ラインの ガス圧が設定値以下になると警報を発 する圧力検知器を設けたことを特徴と する巻取式液面計用の索条巻取装置に おけるシール構造。」 （２）　　同書中、第６頁６〜７行目 「したものと」を「なるように」に訂正する。 以上Fig. 1 is a schematic diagram of a winding type liquid level measuring device, Figs. 2 and 3 are sectional views of a conventional shaft sealing device, Fig. 4 is a sectional view of a shaft sealing device according to the present invention, and Fig. 5 (a). (b) is a diagram of the gas supply system, and FIG. 6 is a diagram of the gas supply system provided with a gas leak detector. In the figure: 1 Tank 2 Fucoat 3 as a liquid level sensor Tape 4 Tape winding mechanism 5 Winding mechanism casing 8 Rotating shaft 12 Cylinder 13 Lid 14 Housing 15a, 15b Sealing material 16
Airtight chamber 17 Gas inlet 18a, 18b
Annular body 19 Compression spring 20 Pressure regulating valve
21 Cylinder 22 Pressurized tank 23 Gas supply line 24 Pressure gauge 25 Flow meter Applicant Tokyo Keiso Co., Ltd. Agent Patent attorney 1) Kiyomi No. 6 5 Procedural amendment Commissioner of the Japan Patent Office Kazuo Wakasugi 1 Display of the case Showa 1957 Patent Application No. 212868 3 Relationship with the person making the amendment 41 cases Applicant's residence "8 in 1 (Name) Tokyo Keiso Co., Ltd. 5 Date of amendment order Contents of the amendment as stated in the voluntary attachment ( 1) The statement in the claims section of the specification is amended as follows: [(1) For winding up or unwinding a cable such as a tape or wire connected to a liquid level sensor in a tank A rotating shaft for converting the amount of movement of the sealing how wire into a rotational angle is provided on one side of the casing that houses the winding mechanism of the casing, and extends from the casing through the housing and protrudes into the atmosphere; A pair of sealing materials are provided facing each other in the axial direction to form an airtight chamber between the two sealing materials. A seal structure in a cable winding device for a winding type liquid level gauge characterized by being filled with high-pressure inert gas. (2) A seal structure for a cable winding device for a winding type liquid level gauge. The wire for winding up or unwinding the wire = ≠ A seal is attached to one side of the casing housing the winding mechanism, or a rotating shaft that converts the amount of wire movement into a rotation angle is passed through the housing from the casing to the atmosphere. A pair of sealing materials are provided inside the housing and are arranged opposite to each other in the axial direction of the rotating shaft to form an airtight chamber between the two sealing materials. In addition, the inert gas supply line to the airtight chamber is filled with an inert gas that is inert and has a higher pressure than the gas pressure in the tank, and an alarm is issued when the gas pressure in the gas supply line falls below the set value. A seal structure in a rope winding device for a winding type liquid level gauge, characterized by being equipped with a pressure sensor that emits pressure." (2) In the same book, p. Correct it to "so that it becomes so."that's all

Claims (2)

【特許請求の範囲】[Claims] （１）　　タンク内の液面感得体に接続されたテープや
ワイヤ等の索条な巻き取りまたは巻き戻すためのテープ
巻取機構を収納したケーシングの一側部にシール用ハウ
ジングを設けて、巻取機構におけるテープの移動量を回
転角に変換する回転軸をケーシングから前記ノ・ウジン
グを貫通せしめて大気中に突出せしめ、かつ前記ハウジ
ング内に、回転軸の軸線方向で相対峙する１対のシール
材を設げて両シール材間に気密室を形成し、この気密室
内へタンク内のガスに対して不活性で、しかもタンク内
のガス圧よりも高圧な不活性ガスを充喝せしめたことを
特徴とする巻取式液面計用の索条巻取装置におけるシー
ル構造。(1) A sealing housing is provided on one side of the casing that houses a tape winding mechanism for winding or unwinding tape, wire, etc. connected to the liquid level sensor in the tank. A rotating shaft for converting the amount of movement of the tape in the take-up mechanism into a rotation angle is made to pass through the nozzle from the casing and protrude into the atmosphere, and a pair of rotating shafts are provided in the housing, facing each other in the axial direction of the rotating shaft. A sealing material is provided to form an airtight chamber between the two sealing materials, and this airtight chamber is filled with an inert gas that is inert to the gas in the tank and has a higher pressure than the gas pressure in the tank. A seal structure in a cable winding device for a winding type liquid level gauge, characterized by: （２）　　タンク内の液面感得体に接続されたテープや
ワイヤ等の索条を巻き取りまたは巻き戻すためのテープ
巻取機構を収納したケーシングの一側部にシール用ハウ
ジングを設けて、巻取機構におけるテープの移動量を回
転角に変換する回転軸をケーシングから前記ハウジング
を貫通せしめて大気中に突出せしめ、かつ前記ハウジン
グ内に、回転軸の軸線方向で相対帖する１対のシール材
を設けて両シール材間釦気密室を形成し、この気密室内
へタンク内のガスに対して不活性で、しかもタンク内つ
ガス圧よりも高圧な不活性ガス状曝せしめ、かつ前記気
密室への不活性ガス供給ラインに、ガス供給ラインのガ
ス圧が設定値以下になると警報を発する圧力検知器を設
けたことを特徴とする巻取式液面計用の索条巻取装置に
おけるシール構造。(2) A sealing housing is provided on one side of the casing housing a tape winding mechanism for winding up or unwinding cables such as tape or wire connected to the liquid level sensor in the tank. A pair of sealing materials are provided in the housing, the rotary shaft for converting the amount of movement of the tape in the take-up mechanism into a rotation angle from the casing and through the housing to protrude into the atmosphere, and that are disposed opposite each other in the axial direction of the rotary shaft. An airtight chamber is formed between the two sealing materials, and an inert gas which is inert to the gas in the tank and has a higher pressure than the gas pressure inside the tank is exposed to the airtight chamber, and A seal in a cable winding device for a winding type liquid level gauge, characterized in that the inert gas supply line is equipped with a pressure detector that issues an alarm when the gas pressure in the gas supply line falls below a set value. structure.