JP6200292B2

JP6200292B2 - accumulator

Info

Publication number: JP6200292B2
Application number: JP2013238681A
Authority: JP
Inventors: 内田　健; 健内田; 尚人中野; 博嗣水上
Original assignee: NHK Spring Co Ltd
Current assignee: NHK Spring Co Ltd
Priority date: 2012-12-12
Filing date: 2013-11-19
Publication date: 2017-09-20
Anticipated expiration: 2033-11-19
Also published as: CN103867502B; JP2014119115A; CN103867502A; KR101598507B1; KR20140076510A

Description

本発明は、ベローズを利用して液圧のバランスと緩和機能を実現させるアキュムレータに関し、特に、高温・中圧・高粘性の油を含む高温液体を用いる船舶エンジンに適用されるアキュムレータに関する。 The present invention relates to an accumulator that uses a bellows to realize a hydraulic pressure balance and relaxation function, and more particularly to an accumulator that is applied to a marine engine that uses a high-temperature liquid containing high-temperature, medium-pressure, and high-viscosity oil.

従来、例えば船舶エンジンの液圧回路において、船舶の揺れにより、または、液圧ポンプの駆動により発生する液圧脈動を吸収するためにアキュムレータが用いられる。
このようなエンジン液圧回路用のアキュムレータとして、例えば図４に示すように、ベローズを用いた内気式アキュムレータ１００が知られている。 Conventionally, for example, in a hydraulic circuit of a ship engine, an accumulator is used to absorb a hydraulic pulsation generated by a shake of a ship or a drive of a hydraulic pump.
As such an accumulator for an engine hydraulic circuit, for example, as shown in FIG. 4, an inside-air type accumulator 100 using a bellows is known.

図４に示すアキュムレータ１００は、筒体部１０１を有する圧力容器１０２の内部に、液室１０３と、圧縮ガスと調整液が密封されている気室１０４と、液室１０３と気室１０４とを仕切る仕切部材１２０とを備えている。
仕切部材１２０は、圧力容器１０２の軸方向Ｏに沿って伸縮可能な金属ベローズ１２１と、金属ベローズ１２１および圧力容器１０２の筒体部１０１間に設けられるベローズガイド部材１２２と、金属ベローズ１２１の一端に位置するベローズエンドカバー１２５とを有している。さらに、液室１０３を有し、接続部１０８を有するエンドカバー部材１０５からなる。 An accumulator 100 shown in FIG. 4 includes a liquid chamber 103, an air chamber 104 in which a compressed gas and an adjustment liquid are sealed, a liquid chamber 103, and an air chamber 104 inside a pressure vessel 102 having a cylindrical body portion 101. And a partition member 120 for partitioning.
The partition member 120 includes a metal bellows 121 that can be expanded and contracted along the axial direction O of the pressure vessel 102, a bellows guide member 122 provided between the metal bellows 121 and the cylindrical body portion 101 of the pressure vessel 102, and one end of the metal bellows 121. And a bellows end cover 125 which is located at the bottom. Further, it has an end cover member 105 having a liquid chamber 103 and having a connecting portion 108.

この金属ベローズ１２１の固定端（図４で右端部を参照）は、気室エンドカバー部材１１７に連結固定され、可動端（図４で左端部を参照）は、金属ベローズ１２１の伸縮に従って移動可能に構成されている。
つまり、ベローズエンドカバー１２５によりベローズガイド部材１２２を介して金属ベローズ１２１を筒体部１０１の内壁に沿わせて伸縮し、摺動する。
金属ベローズ１２１は、断面がＵ型のひだ壁を有する金属製の成型ベローズ（Ｕ型ベローズという）である。 The fixed end (see the right end in FIG. 4) of the metal bellows 121 is connected and fixed to the air chamber end cover member 117, and the movable end (see the left end in FIG. 4) is movable according to the expansion and contraction of the metal bellows 121. It is configured.
That is, the bellows end cover 125 extends and contracts the metal bellows 121 along the inner wall of the cylindrical portion 101 via the bellows guide member 122 and slides.
The metal bellows 121 is a metal molded bellows (referred to as a U-shaped bellows) having a U-shaped pleat wall in cross section.

図４に示すように、気室エンドカバー部材１１７は、圧力容器１０２の筒体部１０１のベローズ固定端側を密封している。気室エンドカバー部材１１７と、ベローズエンドカバー１２５を含む仕切部材１２０とにより囲まれている内側空間は、気室１０４として使用される。気室１０４内に収容するガス体積調整液の一例として、鉱物油を用いる。気室エンドカバー部材１１７には注入口１３１が設けられている。注入口１３１を通して気室１０４内にガス体積調整液と不活性ガス、例えば窒素ガス、ヘリウムガスを注入する。これらのガスを注入した後、ボルト等を用いた注入栓１３２により注入口１３１を密封して気密性を高める。 As shown in FIG. 4, the air chamber end cover member 117 seals the bellows fixed end side of the cylindrical portion 101 of the pressure vessel 102. The inner space surrounded by the air chamber end cover member 117 and the partition member 120 including the bellows end cover 125 is used as the air chamber 104. Mineral oil is used as an example of the gas volume adjusting liquid stored in the air chamber 104. The air chamber end cover member 117 is provided with an inlet 131. A gas volume adjusting liquid and an inert gas such as nitrogen gas or helium gas are injected into the air chamber 104 through the inlet 131. After injecting these gases, the injection port 131 is sealed with an injection plug 132 using a bolt or the like to enhance the airtightness.

なお、ベローズガイド部材１２２は、通常ナイロン等の樹脂、例えば高耐衝撃性、高強度のナイロンを使用してＣ型リング状部品を形成する。なお、Ｃ型リング状部品の縦断面はＬ型であり、その中で、Ｃ型リング状部品の周方向部と筒体部１０１の内壁が摺動して接触され、径方向部は金属ベローズ１２１により覆われる。 The bellows guide member 122 is typically formed of a resin such as nylon, for example, high impact resistance, high strength nylon to form a C-shaped ring-shaped part. The C-shaped ring-shaped component has an L-shaped vertical cross section, in which the circumferential portion of the C-shaped ring-shaped component and the inner wall of the cylindrical portion 101 are in sliding contact with each other, and the radial portion is a metal bellows. 121.

ベローズガイド部材１２２が金属ベローズ１２１の伸縮に伴い筒体部１０１の内壁に沿って軸方向に摺動するとき、その外周部（つまり周方向リング）は液圧回路側の液圧油と接触する（以下、図４に示すような構成を内気式構造という）。 When the bellows guide member 122 slides in the axial direction along the inner wall of the cylindrical portion 101 as the metal bellows 121 expands and contracts, the outer peripheral portion (that is, the circumferential ring) comes into contact with hydraulic oil on the hydraulic circuit side. (Hereinafter, the configuration as shown in FIG. 4 is referred to as the inside air structure).

特開２００１−１４６９０１号公報JP 2001-146901 A

しかしながら、前記内気式構造のアキュムレータについては、その内部に装着するナイロン製のガイド部材がＳ（イオウ）、Ｐ（リン）により高温分解され、損傷するおそれがあるため、長期の航海となる外洋向けの大型船舶に適用できないという問題があった。 However, for the accumulator with the above-mentioned internal structure, the nylon guide member installed in the accumulator is decomposed at high temperature by S (sulfur) and P (phosphorus) and may be damaged. There was a problem that it could not be applied to large ships.

また、高温液体の一例として、例えば１５０℃程度のＣ重油を挙げられる。具体的には、外洋向けの大型船舶のエンジン等の液圧回路では、高温液体の一例として、例えばディーゼルオイルまたは高粘度エンジン油等の重油が挙げられる。重油にはＳ、Ｐが含まれている。特にＣ重油は、その中にＳ、Ｐを含んでいるのみならず、室温では流動性がない。そのため、Ｃ重油は、１５０℃程度まで昇温して流動性を高めて使用する。
この時の高温下におけるＳ、Ｐの存在は、Ｓ、Ｐと接触して浸漬されるベローズガイド部材１２２の素材であるナイロンを分解する。このような経時劣化によりベローズガイド部材１２２が消耗し、ベローズまたはベローズ溶接部が直接筒体部１０１の内壁に沿って摺動するため、深刻な磨滅等の問題をもたらすことになる。 Moreover, as an example of the high temperature liquid, for example, C heavy oil at about 150 ° C. can be mentioned. Specifically, in a hydraulic circuit such as an engine of a large ship for the open ocean, heavy oil such as diesel oil or high-viscosity engine oil can be cited as an example of a high-temperature liquid. Heavy oil contains S and P. In particular, C heavy oil not only contains S and P but also has no fluidity at room temperature. For this reason, C heavy oil is used by raising the temperature to about 150 ° C. to increase fluidity.
The presence of S and P under high temperature at this time decomposes nylon which is a material of the bellows guide member 122 immersed in contact with S and P. Due to such deterioration over time, the bellows guide member 122 is consumed, and the bellows or the bellows welded portion slides directly along the inner wall of the cylindrical portion 101, which causes serious problems such as wear.

そこで、上記の摩耗、磨滅の問題を避けるため、従来技術では筒体部１０１とベローズエンドカバー１２５の間にシール部材を設置して、ベローズガイド部材１２２ができるだけ覆われるようにすることで、重油とベローズガイド部材１２２が接触するのを防止する。
しかし、図４に示すように、ベローズガイド部材１２２は、筒体部１０１に沿って摺動しながら接触されるように設置され、高温、中圧、高粘性等の作業環境でも、Ｃ重油等の高温液体が液室側からベローズガイド部材１２２と筒体部１０１の間の摺動するために必要な最小限の隙間を通過することは避けられず、金属ベローズ１２１と筒体部１０１の間の空間にＣ重油が入るため、ベローズガイド部材１２２はやはりＣ重油に浸漬されることになる。
このように、シール部材を設置しても、ベローズガイド部材１２２の高温分解を有効に防止することはできない。 Therefore, in order to avoid the above-mentioned problems of wear and abrasion, in the prior art, a sealing member is installed between the cylindrical body portion 101 and the bellows end cover 125 so that the bellows guide member 122 is covered as much as possible. And the bellows guide member 122 are prevented from contacting each other.
However, as shown in FIG. 4, the bellows guide member 122 is installed so as to be slid along the cylindrical portion 101, and even in a working environment such as high temperature, medium pressure, high viscosity, etc. It is inevitable that the high-temperature liquid passes through the minimum gap necessary for sliding between the bellows guide member 122 and the cylindrical portion 101 from the liquid chamber side, and between the metal bellows 121 and the cylindrical portion 101. Since C heavy oil enters this space, the bellows guide member 122 is also immersed in C heavy oil.
Thus, even if the seal member is installed, high-temperature decomposition of the bellows guide member 122 cannot be effectively prevented.

前記内気式構造のアキュムレータ１００を外洋向けの大型船舶に適用できない問題を解決するために、本発明者は大型船舶にも適用できる外気式構造のアキュムレータを開発した。
例えば、引用文献１：特開２００１-１４６９０１を参照。
しかし、図４に示すように、その中のベローズガイド部材１２２も調整液と接触するため、Ｓ，Ｐ含む液体による高温分解がナイロンの耐久性に影響するという問題があり、また、アキュムレータ本体も高粘度の液体では作動速度が遅いため適用できないという問題があった。 In order to solve the problem that the accumulator 100 having the inside air structure cannot be applied to a large ship for the open ocean, the present inventor has developed an accumulator having an outside air structure that can be applied to a large ship.
For example, see cited document 1: Japanese Patent Laid-Open No. 2001-146901.
However, as shown in FIG. 4, the bellows guide member 122 therein also comes into contact with the adjustment liquid, so that there is a problem that high-temperature decomposition due to the liquid containing S and P affects the durability of the nylon. A high-viscosity liquid has a problem that it cannot be applied because the operation speed is slow.

そこで、本発明は、前記実情に鑑みなされたものであり、ベローズガイド部材の耐久性を大幅に改善する外気式構造のアキュムレータを提供することを課題とする。 Therefore, the present invention has been made in view of the above circumstances, and an object of the present invention is to provide an accumulator having an outside air structure that greatly improves the durability of the bellows guide member.

前記課題を達成するために、本発明のアキュムレータ（１０）は、圧力容器（２）と、該圧力容器（２）の内部に収容され、該圧力容器（２）の内部空間を液室（３）と気室（４）に仕切る仕切部材（２０）と、を有し、前記圧力容器（２）は、筒体部（１）と、該筒体部（１）の液室側端部に位置する液室エンドカバー部材（１８）と、前記筒体部（１）の気室側端部に位置する気室エンドカバー部材（１７）と、を有するアキュムレータ（１０）であって、前記仕切部材（２０）は、前記筒体部（１）の軸方向Ｏに沿って伸縮可能な金属ベローズ（２１）と、前記金属ベローズ（２１）の可動端（２６）に液密に連結されるベローズエンドカバー（２５）と、を備え、前記可動端（２６）は、前記ベローズエンドカバー（２５）とともに移動可能にして、摺動する少なくとも１つのベローズガイド部材（２２）の案内で前記金属ベローズ（２１）を前記軸方向Ｏに沿って伸縮させ、前記気室（４）にはガスと調整液からなるガス体積調整液が収容されており、前記液室エンドカバー部材（１８）には液体が外部から前記液室（３）に流れ込んで、該液室（３）内から液体が流れ出る液体出入口（３０）を設けてあり、前記金属ベローズ（２１）の固定端（２７）は、前記液室エンドカバー部材（１８）に液密に固定連結され、または、前記液室エンドカバー部材（１８）側の前記筒体部（１）の内壁に液密に固定連結され、前記可動端（２６）は、前記軸方向Ｏに、前記固定端（２７）と前記気室エンドカバー部材（１７）の間に位置し、前記ベローズガイド部材（２２）は、前記金属ベローズ（２１）の隣接するひだ壁（２８）間に介装され、または、前記ベローズエンドカバー（２５）に固定連結され、あるいは、前記可動端（２６）に固定連結され、前記ベローズガイド部材（２２）を前記金属ベローズ（２１）により前記液室（３）から分離するようにし、前記ガス体積調整液には、Ｓ、Ｐを含まない、もしくは、少なくともそれぞれのＳ、Ｐが微量の１０ｐｐｍ以下の鉱物油を使用することを特徴とする。 In order to achieve the above object, an accumulator (10) according to the present invention is accommodated in a pressure vessel (2) and the pressure vessel (2), and the internal space of the pressure vessel (2) is placed in a liquid chamber (3 ) And a partition member (20) for partitioning into the air chamber (4), and the pressure vessel (2) is connected to the cylindrical portion (1) and the liquid chamber side end of the cylindrical portion (1). An accumulator (10) having a liquid chamber end cover member (18) positioned and an air chamber end cover member (17) positioned at an air chamber side end of the cylindrical body portion (1), wherein the partition The member (20) includes a metal bellows (21) that can expand and contract along the axial direction O of the cylindrical body portion (1), and a bellows that is liquid-tightly connected to the movable end (26) of the metal bellows (21). An end cover (25), and the movable end (26) together with the bellows end cover (25) The metal bellows (21) is expanded and contracted along the axial direction O by the guide of at least one bellows guide member (22) that is slidable, and the gas chamber (4) is supplied with gas and adjusting liquid. The liquid volume end liquid is stored in the liquid chamber end cover member (18), and the liquid flows into the liquid chamber (3) from the outside and flows out from the liquid chamber (3). 30), and the fixed end (27) of the metal bellows (21) is liquid-tightly fixedly connected to the liquid chamber end cover member (18), or the liquid chamber end cover member (18) side. The movable end (26) is fixedly connected to the inner wall of the cylindrical body portion (1) in the axial direction O between the fixed end (27) and the air chamber end cover member (17). The bellows guide member (22) is located at The bellows guide is interposed between adjacent pleat walls (28) of the metal bellows (21), fixedly connected to the bellows end cover (25), or fixedly connected to the movable end (26). The member (22) is separated from the liquid chamber (3) by the metal bellows (21), and the gas volume adjusting liquid does not contain S or P, or at least each of S and P is a trace amount. A mineral oil of 10 ppm or less is used.

請求項２に係る発明は、請求項１に記載のアキュムレータ（１０）であって、前記金属ベローズ（２１）の径方向の内側には、有底筒状の調整部材（３５）が設けられ、該調整部材（３５）は、その開口端が液密に前記液室エンドカバー部材（１８）に連結され、前記調整部材（３５）には貫通孔が設置されていることを特徴とする。 The invention according to claim 2 is the accumulator (10) according to claim 1, wherein a bottomed cylindrical adjustment member (35) is provided on the inner side in the radial direction of the metal bellows (21), The adjustment member (35) is characterized in that an opening end of the adjustment member (35) is liquid-tightly connected to the liquid chamber end cover member (18), and a through hole is provided in the adjustment member (35).

請求項３に係る発明は、請求項２に記載のアキュムレータ（１０）であって、前記調整部材（３５）は、有底筒状の底に貫通して設置される縦孔（３４）および／または有底筒状に貫通して設置される横孔（３３）を前記貫通孔として備えていることを特徴とする。 The invention according to claim 3 is the accumulator (10) according to claim 2, wherein the adjusting member (35) is provided with a vertical hole (34) and / or installed in a bottomed cylindrical bottom. Or it has the horizontal hole (33) penetrated and installed in a bottomed cylindrical shape as the said through-hole, It is characterized by the above-mentioned.

請求項４に係る発明は、請求項１〜３のいずれか一項に記載のアキュムレータ（１０）であって、前記可動端（２６）に前記ベローズガイド部材（２２）が設置されており、前記ベローズガイド部材（２２）の前記仕切部材（２０）と前記筒体部（１）との間に介設される外周方向ガイド部（２２ａ）は前記ガス体積調整液に接触することを特徴とする。 The invention according to claim 4 is the accumulator (10) according to any one of claims 1 to 3, wherein the bellows guide member (22) is installed at the movable end (26), An outer peripheral guide portion (22a) interposed between the partition member (20) of the bellows guide member (22) and the cylindrical body portion (1) is in contact with the gas volume adjusting liquid. .

請求項５に係る発明は、請求項１〜４のいずれか一項に記載のアキュムレータ（１０）であって、前記金属ベローズ（２１）は軸方向の断面がウェーブ状のベローズであることを特徴とする。 The invention according to claim 5 is the accumulator (10) according to any one of claims 1 to 4, wherein the metal bellows (21) is a bellows having a wavy cross section in the axial direction. And

請求項６に係る発明は、請求項１〜５のいずれか一項に記載のアキュムレータ（１０）であって、前記可動端（２６）において、前記ベローズエンドカバー（２５）と前記筒体部（１）の間に前記ベローズガイド部材（２２）の前記外周方向ガイド部（２２ａ）のみが設置されていることを特徴とする。 The invention which concerns on Claim 6 is the accumulator (10) as described in any one of Claims 1-5, Comprising: In the said movable end (26), the said bellows end cover (25) and the said cylinder part ( 1), only the outer peripheral direction guide portion (22a) of the bellows guide member (22) is installed.

請求項７に係る発明は、請求項１〜６のいずれか一項に記載のアキュムレータ（１０）であって、前記ベローズガイド部材（２２）はナイロンで形成されることを特徴とする。 The invention according to claim 7 is the accumulator (10) according to any one of claims 1 to 6, wherein the bellows guide member (22) is made of nylon.

請求項８に係る発明は、請求項１〜７のいずれか一項に記載のアキュムレータ（１０）であって、前記気室エンドカバー部材（１７）には、前記気室（４）内にガス体積調整液を注入する注入口（３１）が設けられ、前記注入口（３１）には、前記注入口（３１）を密封するためのシール（３２）が設置されていることを特徴とする。 The invention according to claim 8 is the accumulator (10) according to any one of claims 1 to 7, wherein the air chamber end cover member (17) includes a gas in the air chamber (4). An injection port (31) for injecting a volume adjusting liquid is provided, and a seal (32) for sealing the injection port (31) is installed in the injection port (31).

請求項９に係る発明は、請求項１〜８のいずれか一項に記載のアキュムレータ（１０）であって、前記ベローズエンドカバー（２５）が前記調整部材（３５）に直接接触可能であることを特徴とする。 The invention according to claim 9 is the accumulator (10) according to any one of claims 1 to 8, wherein the bellows end cover (25) can directly contact the adjusting member (35). It is characterized by.

本発明による上記の態様では、ベローズガイド部材は、ガス体積調整液とは接触するが、液室内の高温液体とは接触しない外気式構造を採用している。
これにより、少なくともそれぞれのＳ、Ｐが微量の１０ｐｐｎ以下を含むか、Ｓ、Ｐを含まないガス体積調整液を使用することで、ベローズガイド部材が液室内の液体とは接触しないが、ガス体積調整液とは接触する場合でも、高温でナイロン材料がＳ、Ｐに分解される問題は生じない。
添加物がほとんどない（つまり、Ｓ、Ｐはほとんど存在しない）鉱物油をガス体積調整液として使用することで、ベローズガイド部材の耐用性を明らかに向上させる顕著な効果を得ることができる。
それと共に、本発明によるアキュムレータにおいて、気室内のガス体積調整液は脱Ｓ、Ｐのみを要求されるため、こういった要求は低コストで容易に満足させることが可能である。 In the above aspect according to the present invention, the bellows guide member employs an outside air structure that contacts the gas volume adjusting liquid but does not contact the high temperature liquid in the liquid chamber.
Thereby, at least each of S and P contains a small amount of 10ppn or less, or by using a gas volume adjustment liquid that does not contain S and P, the bellows guide member does not come into contact with the liquid in the liquid chamber. Even when it comes into contact with the adjustment liquid, there is no problem that the nylon material is decomposed into S and P at a high temperature.
By using mineral oil having almost no additive (that is, almost no S or P) as the gas volume adjusting liquid, a remarkable effect of clearly improving the durability of the bellows guide member can be obtained.
At the same time, in the accumulator according to the present invention, the gas volume adjusting liquid in the air chamber is required only to remove S and P, so that such a request can be easily satisfied at low cost.

本発明による実施例のアキュムレータの側断面図、この時のアキュムレータは液室側圧力が最小時の状態である。FIG. 3 is a side sectional view of the accumulator of the embodiment according to the present invention, and the accumulator at this time is in a state where the liquid chamber side pressure is minimum. 図２（ａ）、（ｂ）は、本発明による一実施例の調整部材を示す軸方向の断面図と軸方向の平面図である。2A and 2B are an axial sectional view and an axial plan view showing an adjusting member according to an embodiment of the present invention. 図３（ａ）は、それぞれ本発明による一実施例のベローズガイド部材を示す側面図、図３（ｂ）はＡ−Ａ線の断面図、図３（ｃ）は、Ｂ-Ｂ線の断面図である。3A is a side view showing a bellows guide member according to an embodiment of the present invention, FIG. 3B is a sectional view taken along line AA, and FIG. 3C is a sectional view taken along line BB. FIG. 液室側圧力が最小時の従来のアキュムレータを示す断面図である。It is sectional drawing which shows the conventional accumulator when the liquid chamber side pressure is the minimum.

以下、本発明による実施例のアキュムレータ１０について、図面を参照して詳しく説明する。以下の明細書では、高温液体として１５０度程度のＣ重油を例として説明するが、本発明は１５０度程度のＣ重油に限るものではない。 Hereinafter, an accumulator 10 according to an embodiment of the present invention will be described in detail with reference to the drawings. In the following description, a C heavy oil of about 150 degrees is described as an example of the high-temperature liquid, but the present invention is not limited to a C heavy oil of about 150 degrees.

アキュムレータ１０は、例えば船舶エンジンの液圧回路３０（図面において液圧回路の液室３と連通する部分を模式的に示す）に発生する液圧脈動を吸収すること、或いは圧力を蓄積することに用いられる。
アキュムレータ１０の圧力容器２は、金属製の円筒状筒体部１と、例えば筒体部１の一端側（気室側）に液密に溶接されている金属製の気室エンドカバー部材１７と、例えば筒体部１の他端側（液室側）に液密に溶接されている金属製の液室エンドカバー部材１８と、を備える。圧力容器２は、アキュムレータ１０に作用される使用圧力に耐えられる剛性を有している。 The accumulator 10 absorbs a hydraulic pulsation generated in, for example, a hydraulic circuit 30 of a marine engine (schematically shows a portion communicating with the hydraulic chamber 3 of the hydraulic circuit in the drawing) or accumulates pressure. Used.
The pressure vessel 2 of the accumulator 10 includes a metal cylindrical tube portion 1 and a metal air chamber end cover member 17 that is liquid-tightly welded to, for example, one end side (air chamber side) of the tube portion 1. For example, a liquid chamber end cover member 18 made of metal that is liquid-tightly welded to the other end side (liquid chamber side) of the cylindrical body portion 1 is provided. The pressure vessel 2 has a rigidity that can withstand the working pressure applied to the accumulator 10.

アキュムレータ１０は、圧力容器２内部に液室３と、圧縮ガスとガス体積調整液が密封されている気室４と、液室３と気室４を仕切る仕切部材２０と、を有している。
仕切部材２０は、圧力容器２の軸方向Ｏ、つまり、筒体部１の軸方向Ｏに沿って伸縮可能な金属ベローズ２１と、金属ベローズ２１の一端に、つまり、後記する可動端２６に液密に直接あるいは間接的に連結されるベローズエンドカバー２５と、を備える。 The accumulator 10 includes a liquid chamber 3 inside the pressure vessel 2, an air chamber 4 in which compressed gas and a gas volume adjusting liquid are sealed, and a partition member 20 that partitions the liquid chamber 3 and the air chamber 4. .
The partition member 20 is liquid at the metal bellows 21 that can expand and contract along the axial direction O of the pressure vessel 2, that is, along the axial direction O of the cylindrical body 1, and at one end of the metal bellows 21, that is, at a movable end 26 described later. And a bellows end cover 25 that is directly or indirectly connected.

金属ベローズ２１は、図１に示すように、軸方向Ｏに沿って複数のひだ壁２８が形成され、ひだ壁２８の縦断面（つまり、軸方向に沿う断面）はウェーブ状、つまり、波状または倒れたＳ字型に形成されている。
図１に示すように、金属ベローズ２１の液室側左端部、つまり、固定端２７は、例えば溶接により液室エンドカバー部材１８の金属ベローズ２１の左端部と対向する第一固定部２３に液密に固定連結される。一つの変形例として、筒体部１の内周壁に液密に固定連結されてもよい。金属ベローズ２１は軸方向Ｏに沿って設けられている。金属ベローズ２１の気室側右端部、つまり、可動端２６には液密になるように、例えばベローズエンドカバー２５が溶接して連結されている。
このように、金属ベローズ２１は固定端２７から可動端２６までの方向と液室エンドカバー部材１８から気室エンドカバー部材１７までの方向が同一に構成されている。
つまり、金属ベローズ２１の可動端２６は、軸方向Ｏで固定端２７と気室エンドカバー部材１７の間の中途に位置する。 As shown in FIG. 1, the metal bellows 21 has a plurality of pleat walls 28 formed along the axial direction O, and the longitudinal cross section (that is, the cross section along the axial direction) of the pleat walls 28 is wavy, that is, wavy or It is formed into a fallen S-shape.
As shown in FIG. 1, the liquid chamber side left end portion of the metal bellows 21, that is, the fixed end 27 is liquidated to the first fixed portion 23 facing the left end portion of the metal bellows 21 of the liquid chamber end cover member 18 by, for example, welding. Closely fixedly connected. As one modification, the inner peripheral wall of the cylindrical part 1 may be fixedly connected in a liquid-tight manner. The metal bellows 21 is provided along the axial direction O. For example, a bellows end cover 25 is connected to the right end of the metal bellows 21 on the air chamber side, that is, the movable end 26 by welding so as to be liquid-tight.
Thus, the metal bellows 21 is configured in the same direction from the fixed end 27 to the movable end 26 and from the liquid chamber end cover member 18 to the air chamber end cover member 17.
That is, the movable end 26 of the metal bellows 21 is located in the middle between the fixed end 27 and the air chamber end cover member 17 in the axial direction O.

なお、金属ベローズ２１と筒体部１の間には、一つまたは複数のベローズガイド部材２２を介設できる。ベローズガイド部材２２は摩擦係数が小さい合成樹脂等から形成され、例えば一般には後記するナイロン等の樹脂を使用してＣ型リング状部品を形成できる。
このリング状部品の縦断面はＬ型である。
つまり、図１および図３に示すように、ベローズガイド部材２２は、周方向ガイド部２２ａおよび径方向ガイド部２２ｂを備え、その中で、外周方向ガイド部２２ａ、つまり、リング状部品の外周部と筒体部１の内周壁面は摺動接触し、金属ベローズ２１は軸方向Ｏに沿ってスムーズに伸縮でき、径方向部２２ｂは、例えば金属ベローズ２１の隣接する両ひだ壁２８、２８の間に係り止められる。
これにより、ベローズガイド部材２２は、液室３から分離され、液室３内の重油と接触しないようになる。 One or a plurality of bellows guide members 22 can be interposed between the metal bellows 21 and the cylindrical portion 1. The bellows guide member 22 is formed of a synthetic resin or the like having a small friction coefficient. For example, a C-shaped ring-shaped component can be formed using a resin such as nylon, which will be described later.
The longitudinal cross section of this ring-shaped part is L-shaped.
That is, as shown in FIG. 1 and FIG. 3, the bellows guide member 22 includes a circumferential guide portion 22a and a radial guide portion 22b, in which an outer circumferential guide portion 22a, that is, an outer circumferential portion of a ring-shaped part. And the inner peripheral wall surface of the cylindrical portion 1 are in sliding contact, the metal bellows 21 can be smoothly expanded and contracted along the axial direction O, and the radial direction portion 22b is formed by, for example, the adjacent pleat walls 28, 28 of the metal bellows 21. Locked in between.
Thereby, the bellows guide member 22 is separated from the liquid chamber 3 and does not come into contact with the heavy oil in the liquid chamber 3.

しかしながら、本発明はこれに限るものではない。一変形例として、ベローズガイド部材２２はその径方向部２２ｂを介してベローズエンドカバー２５に直接固定連結が可能であり、あるいは可動端２６に直接固定連結が可能であり、液室３から効率的に仕切ることができればよい。 However, the present invention is not limited to this. As a modification, the bellows guide member 22 can be directly fixedly connected to the bellows end cover 25 via its radial portion 22b, or can be directly fixedly connected to the movable end 26. What is necessary is just to be able to partition.

前記したように、金属ベローズ２１とベローズエンドカバー２５とで仕切部材２０を構成し、ベローズガイド部材２２は、仕切部材２０の筒体部１内側における軸方向Ｏに沿う伸縮移動に対して、ガイド作用がある。
図１に示すように、仕切部材２０の内側には、有底筒状（カップ状でもよい）の調整部材３５が設けられている。調整部材３５をこのように設置してもよい。調整部材３５の開口端は、例えば溶接により液室エンドカバー部材１８の右側の開口端と対向する第二固定部２４に液密に固定連結される。
第二固定部２４は、図１に示すように、第一固定部２３から縮径して右側に延び出る突起部に形成されるが、第一固定部２３と、第二固定部２４とは共に液室エンドカバー部材１８の右側の同一平面に形成してもよく、その場合は、この平面から右側へ向けて延び出る突起部を持たないことになる。 As described above, the partition member 20 is configured by the metal bellows 21 and the bellows end cover 25, and the bellows guide member 22 is a guide against expansion and contraction along the axial direction O inside the cylindrical portion 1 of the partition member 20. There is an effect.
As shown in FIG. 1, a bottomed cylindrical (or cup-shaped) adjustment member 35 is provided inside the partition member 20. The adjustment member 35 may be installed in this way. The opening end of the adjustment member 35 is fixedly connected in a liquid-tight manner to the second fixing portion 24 facing the opening end on the right side of the liquid chamber end cover member 18 by welding, for example.
As shown in FIG. 1, the second fixing portion 24 is formed in a protruding portion that is reduced in diameter from the first fixing portion 23 and extends to the right side. The first fixing portion 23 and the second fixing portion 24 are Both of them may be formed on the same plane on the right side of the liquid chamber end cover member 18, and in this case, there is no protrusion extending from the plane toward the right side.

図１に示すように、金属ベローズ２１は、液室エンドカバー部材１８と、筒体部１と、ベローズエンドカバー２５、および調整部材３５で囲まれた空間に配置されている。
ベローズガイド部材２２は金属ベローズ２１の使用長さによって一つまたは複数設置できる。１つは仕切部材２０の可動端に位置し、複数設置のときは、さらに、固定端２７と可動端２６の間にも設置する。つまり、金属ベローズ２１の可動端のベローズガイド部材２２の径方向部２２ｂは金属ベローズ２１の隣接するひだ壁２８，２８で介設、被覆されてもよいが、その周方向部２２ａは被覆されておらず金属ベローズ２１から延び出て気室側に向かって延びており、筒体部１と仕切部材２０（例えばベローズエンドカバー２５および／または金属ベローズ２１）との間に介設される状態で筒体部１の内壁に沿って摺動可能である。 As shown in FIG. 1, the metal bellows 21 is disposed in a space surrounded by the liquid chamber end cover member 18, the cylindrical body portion 1, the bellows end cover 25, and the adjustment member 35.
One or more bellows guide members 22 can be installed depending on the length of use of the metal bellows 21. One is located at the movable end of the partition member 20, and is further installed between the fixed end 27 and the movable end 26 in the case of a plurality of installations. In other words, the radial portion 22b of the bellows guide member 22 at the movable end of the metal bellows 21 may be interposed and covered by the adjacent fold walls 28, 28 of the metal bellows 21, but the circumferential portion 22a is covered. It extends from the metal bellows 21 and extends toward the air chamber, and is interposed between the cylindrical body 1 and the partition member 20 (for example, the bellows end cover 25 and / or the metal bellows 21). It can slide along the inner wall of the cylindrical portion 1.

これにより、可動端２６に位置するベローズガイド部材２２は、その周方向部２２ａが気室４内のガス体積調整液と接触する構成となっている。
より具体的には、例えば図３の（ａ）、（ｂ）、（ｃ）に示すように、ベローズガイド部材２２は全体的に周方向に1箇所の開口部をもつＣ型リング状部品に形成される。
図３の（ｂ）のＡ-Ａ線の断面図に示すように、このリング状部品の径方向部２２ｂは内周側に向かうにつれて薄くなる円錐形に形成してもよく、それにリングの内周側先端部が金属ベローズ２１と滑らかに隣接されやすいように形成されていることが好ましい。一方、外周方向ガイド部２２ａは、必ずしもリング状部品の全周方向に形成されなくてもよく、図３の（ａ）に示すように、外周方向にお互い離隔するようにリング状部品の周辺縁より軸線方向Ｏに向かって伸び出ることが可能であり、図３のＢ−Ｂ線断面図の（ｃ）に示すような複数の外周方向ガイド部２２ａに形成する。 As a result, the bellows guide member 22 positioned at the movable end 26 has a configuration in which the circumferential direction portion 22 a contacts the gas volume adjusting liquid in the air chamber 4.
More specifically, for example, as shown in FIGS. 3A, 3B, and 3C, the bellows guide member 22 is formed into a C-shaped ring-shaped component having a single opening in the circumferential direction as a whole. It is formed.
As shown in the cross-sectional view along the line AA in FIG. 3B, the radial portion 22b of the ring-shaped part may be formed in a conical shape that becomes thinner toward the inner peripheral side. It is preferable that the circumferential tip is formed so as to be easily adjacent to the metal bellows 21 smoothly. On the other hand, the outer circumferential guide portion 22a does not necessarily have to be formed in the entire circumferential direction of the ring-shaped component, and as shown in FIG. 3A, the peripheral edge of the ring-shaped component is separated from each other in the circumferential direction. It can extend in the axial direction O, and is formed in a plurality of outer circumferential guide portions 22a as shown in (c) of the BB cross-sectional view of FIG.

本発明の実施例では、採用しているガス体積調整液は、少なくともそれぞれのＳ、Ｐを含まないか、もしくはＳ、Ｐが微量の１０ｐｐｍ以下であることが好ましい。
（１０ｐｐｍ＝０．００１％）
ガス気体調整液にＳ、Ｐを含まないか、含むとすれば微量にするため、可動端２６に位置するベローズガイド部材２２を気室４内のガス体積調整液と接触させても、従来技術のような、例えば図４中の内気式構造のようなナイロンがＳ、Ｐにより高温分解される問題は発生しないことから、ベローズガイド部材の使用寿命を著しく長くすることができる。
それと共に、気室４側にガスを含んでいるガス体積調整液は、主に液体（液；態様）として存在するため、ベローズガイド部材２２の潤滑性等に対しては、容易に満足させられる。
そのため、Ｓ、Ｐ等添加物がほとんどない鉱物油をガス体積調整液として使用することで、ベローズガイド部材２２の耐用性を明らかに向上させる効果が得られる。 In the embodiment of the present invention, it is preferable that the gas volume adjusting liquid employed does not contain at least each of S and P, or that S and P are trace amounts of 10 ppm or less.
(10ppm = 0.001%)
Even if the bellows guide member 22 positioned at the movable end 26 is brought into contact with the gas volume adjusting liquid in the air chamber 4 in order to make the gas gas adjusting liquid contain or do not contain S or P, the conventional technology. For example, there is no problem that nylon such as the inside air structure in FIG. 4 is decomposed at high temperature by S and P, so that the service life of the bellows guide member can be remarkably increased.
At the same time, since the gas volume adjusting liquid containing gas on the air chamber 4 side exists mainly as a liquid (liquid; mode), the lubricity and the like of the bellows guide member 22 can be easily satisfied. .
Therefore, the effect of obviously improving the durability of the bellows guide member 22 can be obtained by using mineral oil having almost no additives such as S and P as the gas volume adjusting liquid.

また、気室４内のガス体積調整液にそれぞれ１０ｐｐｍ以下のＳ、Ｐを含む、さらにはＳ、Ｐを含まないため、ベローズガイド部材２２が容易に高温分解されることがなく、この場合、ガス体積調整液を気室４側から可動端２６のベローズガイド部材２２と筒体部１の間の摺動隙間を通過させ、金属ベローズ２１と筒体部１の間の空間に入り込んだとしても、ベローズガイド部材２２に対しては不利な影響は与えない。
そのため、可動端２６に位置するベローズガイド部材２２と、筒体部１と金属ベローズ２１の間の設置関係を適切に設計できれば、内気式のようなシール部材を別途追加しなくて済む。これにより、付属品さらには組み立て工数、コスト等を低減する効果も達成する。 In addition, since the gas volume adjustment liquid in the air chamber 4 contains 10 ppm or less of S and P, respectively, and further does not contain S and P, the bellows guide member 22 is not easily decomposed at high temperature. Even if the gas volume adjusting liquid is allowed to pass through the sliding gap between the bellows guide member 22 and the cylindrical portion 1 of the movable end 26 from the air chamber 4 side, and enters the space between the metal bellows 21 and the cylindrical portion 1. The bellows guide member 22 is not adversely affected.
Therefore, if the installation relationship between the bellows guide member 22 positioned at the movable end 26 and the cylindrical body portion 1 and the metal bellows 21 can be appropriately designed, it is not necessary to separately add a seal member such as an inside air type. As a result, the effect of reducing accessories, assembly man-hours, costs, and the like is also achieved.

図１に示すように、仕切部材２０の右側、つまり、ベローズエンドカバー２５の右側の空間を気室４としている。気室４内に収容されるガス体積調整液の一例として、鉱物油を使用する。気室４内で大気圧より高い圧力で密封する不活性ガスとして、例えばヘリウムガスまたは窒素ガスを使用できる。ガスは、気室エンドカバー部材１７に設置される気弁３２を通って、ガス通路３１を通り、気室４内の予めつぎ込まれたガス体積調整油に供給される。ガス供給後、気弁３２等によりガス通路３１を気密に封止する。 As shown in FIG. 1, the space on the right side of the partition member 20, that is, the right side of the bellows end cover 25 is defined as the air chamber 4. Mineral oil is used as an example of the gas volume adjusting liquid stored in the air chamber 4. For example, helium gas or nitrogen gas can be used as the inert gas sealed in the air chamber 4 at a pressure higher than atmospheric pressure. The gas passes through the gas valve 32 installed in the air chamber end cover member 17, passes through the gas passage 31, and is supplied to the gas volume adjusting oil previously introduced in the air chamber 4. After the gas supply, the gas passage 31 is hermetically sealed by the air valve 32 or the like.

図１は、液室３側の圧力が最小またはゼロの時のベローズエンドカバー２５の位置および金属ベローズ２１を介した気室４の圧力を受けて縮んだ状態を示している。
液圧回路３０で圧力の脈動が現れる時、例えば液室３側の圧力が上昇すると、液室３側の高い圧力がベローズエンドカバー２５に作用し、それを動かすとともに、金属ベローズ２１をつれて軸方向Ｏに沿って気室４側に伸びて移動すると同時に、金属ベローズ２１がベローズガイド部材２２を押して筒体部１の内周壁に沿って摺動する。 FIG. 1 shows the position of the bellows end cover 25 when the pressure on the liquid chamber 3 side is minimum or zero and a state in which the pressure is contracted due to the pressure of the air chamber 4 via the metal bellows 21.
When pressure pulsation appears in the hydraulic circuit 30, for example, when the pressure on the liquid chamber 3 side rises, the high pressure on the liquid chamber 3 side acts on the bellows end cover 25, moves it, and pulls the metal bellows 21. At the same time, the metal bellows 21 pushes the bellows guide member 22 and slides along the inner peripheral wall of the cylindrical portion 1 along the axial direction O.

なお、前記したように、液室３の内部には調整部材３５を設置でき、金属ベローズ２１が気室の圧力に押し潰され、許容密着長さ以下になるのを防止する。金属ベローズ２１において、例えば圧力をかけた各ひだ壁２８がお互いに密着するまで圧縮される状態時、あるいはこの状態になる直前に、ベローズエンドカバー２５と調整部材３５の底面（図１中右側表面部）が接触でき、即ち、ベローズエンドカバー２５が調整部材３５に接触することで、金属ベローズ２１が押し潰されるのを防ぐ。 As described above, the adjusting member 35 can be installed inside the liquid chamber 3 to prevent the metal bellows 21 from being crushed by the pressure of the air chamber and becoming less than the allowable contact length. In the metal bellows 21, for example, when the pleat walls 28 under pressure are compressed until they are in close contact with each other, or immediately before this state, the bottom surfaces of the bellows end cover 25 and the adjustment member 35 (the right surface in FIG. 1). Part), that is, the bellows end cover 25 is in contact with the adjusting member 35, thereby preventing the metal bellows 21 from being crushed.

調整部材３５は円筒状部材あるいは略円筒状部材として、溶接等の適切な手段を利用して、液室エンドカバー部材１８または筒体部１の液室側内壁に固定連結できる。調整部材３５の材料は金属に限ることなく、液室３の高温、中圧、高粘性油等の高温液体の作業環境で耐久的に固形体として金属ベローズ２１が圧力を受けすぎることを防止するように作用できればよく、適切な合成樹脂体或いは弾性体等を採用してもよい。
調整部材３５の壁面には貫通孔が形成され、液室３側からの重油は貫通孔を通過させ、ベローズエンドカバー２５側に到達できるようにすることで圧力をかけている。
より具体的には、図２の（ａ）、（ｂ）に示すように、貫通孔３３，３４は、調整部材３５の円筒壁面に設置する貫通孔３３（横孔ともいう）でもよいし、調整部材３５の底壁面に設置する貫通孔３４（縦孔ともいう）でもよい。貫通孔３３，３４は同時に設置且つ複数設置してもよい。貫通孔３３，３４の形状は円形に限定されず、所要の開口面積が設けられればいかなる形状でもよい。 The adjustment member 35 is a cylindrical member or a substantially cylindrical member, and can be fixedly connected to the liquid chamber end cover member 18 or the liquid chamber side inner wall of the cylindrical portion 1 by using an appropriate means such as welding. The material of the adjustment member 35 is not limited to metal, and the metal bellows 21 is prevented from being excessively subjected to pressure as a solid body in a high-temperature liquid working environment such as high temperature, medium pressure, and high viscosity oil in the liquid chamber 3. Any suitable synthetic resin body or elastic body may be employed.
A through-hole is formed in the wall surface of the adjustment member 35, and heavy oil from the liquid chamber 3 side passes through the through-hole so as to reach the bellows end cover 25 side to apply pressure.
More specifically, as shown in FIGS. 2A and 2B, the through holes 33 and 34 may be through holes 33 (also referred to as horizontal holes) installed on the cylindrical wall surface of the adjustment member 35, A through hole 34 (also referred to as a vertical hole) installed on the bottom wall surface of the adjustment member 35 may be used. A plurality of through holes 33 and 34 may be installed at the same time. The shape of the through holes 33 and 34 is not limited to a circle, and may be any shape as long as a required opening area is provided.

以下、図１を参照し、調整部材３５を設置してある時のアキュムレータ１０の動作原理を説明する。
液圧回路３０で圧力に脈動が現れた時、例えば液室３側圧力が上昇し、気室４側の圧力より高いと、液室３側の高い圧力が重油を強制的に貫通孔３３，３４を通過させ、ベローズ内の液量が増加したことによる液圧力が金属ベローズ２１内壁側を通りベローズエンドカバー２５の左側に到達し、この液圧力をベローズエンドカバー２５に作用させ、これに伴い、金属ベローズ２１が軸方向Ｏに沿って気室４側に伸びて変形し、ベローズエンドカバー２５と共に移動すると同時に、金属ベローズ２１はベローズガイド部材２２を押して筒体部１に沿って摺動する。
従って、気室４側の圧力は、液室３側の圧力とバランスが取れるまで上昇する。 Hereinafter, the operation principle of the accumulator 10 when the adjustment member 35 is installed will be described with reference to FIG.
When pulsation appears in the pressure in the hydraulic circuit 30, for example, if the pressure on the liquid chamber 3 side rises and is higher than the pressure on the air chamber 4 side, the high pressure on the liquid chamber 3 side forces heavy oil through the through holes 33, 34, the liquid pressure due to the increase in the amount of liquid in the bellows passes through the inner wall side of the metal bellows 21 and reaches the left side of the bellows end cover 25, and this liquid pressure is applied to the bellows end cover 25. The metal bellows 21 extends and deforms along the axial direction O toward the air chamber 4 and moves together with the bellows end cover 25. At the same time, the metal bellows 21 slides along the cylindrical body portion 1 by pushing the bellows guide member 22. .
Accordingly, the pressure on the air chamber 4 side increases until the pressure on the liquid chamber 3 side is balanced.

一方、液室３側の圧力が気室４側の圧力より低くなると、気室４側の高い圧力がベローズエンドカバー２５に作用し、それに伴い、金属ベローズ２１が軸方向Ｏに沿って液室３側に圧縮して変形し、ベローズエンドカバー２５と共に移動すると同時に、金属ベローズ２１またはベローズエンドカバー２５がベローズガイド部材２２を押して筒体部１に沿って摺動する。従って、液室３側の圧力は気室４側の圧力とバランスが取れるまで上昇する。
これにより、このような気圧バネ式作用により、圧力を蓄積し且つ液圧の脈動成分を平滑化、均等化できる。
また、前記アキュムレータが脈動により作動する時、気室４側での圧縮ガスが調整液内に溶ける量にも相応の変化がある。ガスとガス体積調整液の割り当てに関しては本発明の実質的内容としてではなく、ここでは詳しく説明しないことにする。 On the other hand, when the pressure on the liquid chamber 3 side becomes lower than the pressure on the air chamber 4 side, the high pressure on the air chamber 4 side acts on the bellows end cover 25, and accordingly, the metal bellows 21 moves along the axial direction O in the liquid chamber. The metal bellows 21 or the bellows end cover 25 pushes the bellows guide member 22 and slides along the cylindrical portion 1 at the same time as it is compressed and deformed to the third side and moves together with the bellows end cover 25. Therefore, the pressure on the liquid chamber 3 side rises until the pressure on the air chamber 4 side is balanced.
Thereby, pressure can be accumulated and the pulsation component of the hydraulic pressure can be smoothed and equalized by such a pneumatic spring type action.
Further, when the accumulator is operated by pulsation, there is a corresponding change in the amount of compressed gas dissolved in the adjustment liquid on the air chamber 4 side. The assignment of gas and gas volume adjustment liquid is not a substantial part of the present invention and will not be described in detail here.

前記したように、調整部材３５の設置有無に関係なく、液室３側の重油は金属ベローズ２１の内壁側と接触するが、その外壁側のベローズガイド部材２２は、重油と分離されるため、ベローズガイド部材２２が重油内に不可避に含まれるＳ、Ｐにより高温で分解される問題は発生しない。
本発明による実施例は、ナイロン製のベローズガイド部材２２の高温分解問題を効果的に解決し、これによりベローズガイド部材２２の材料への要求を大きく下げることができる。
例えば、ベローズガイド部材２２に用いるナイロンとしては、ナイロン６６、ナイロン４６またはナイロン６を使用して形成してもよい。例えば、非補強型のナイロン４６の熱変形温度は１６０℃であり、補強型ナイロン４６のプラスチック原料は２９０℃であり、さらに長期使用温度は１６３℃である。ナイロン４６は高温で高硬度を保持でき、優れた耐磨耗性を有し、且つ表面が滑らかで硬いため、摺動材料に望ましい材料として本発明のベローズガイド部材２２に適用することができる。 As described above, regardless of whether or not the adjustment member 35 is installed, the heavy oil on the liquid chamber 3 side contacts the inner wall side of the metal bellows 21, but the bellows guide member 22 on the outer wall side is separated from the heavy oil. The problem that the bellows guide member 22 is decomposed at a high temperature by S and P inevitably contained in heavy oil does not occur.
The embodiment according to the present invention effectively solves the high-temperature decomposition problem of the nylon bellows guide member 22, thereby greatly reducing the material requirements of the bellows guide member 22.
For example, nylon 66, nylon 46 or nylon 6 may be used as the nylon used for the bellows guide member 22. For example, the heat deformation temperature of the non-reinforced nylon 46 is 160 ° C., the plastic raw material of the reinforced nylon 46 is 290 ° C., and the long-term use temperature is 163 ° C. Nylon 46 can maintain high hardness at high temperatures, has excellent wear resistance, and has a smooth and hard surface. Therefore, it can be applied to the bellows guide member 22 of the present invention as a desirable material for the sliding material.

前記実施例では、液室エンドカバー部材１８と、仕切部材２０とで囲まれて形成される空間は液室３として使用される。
なお、本実施例では、液室３と気室４の間に、ベローズエンドカバー２５を含む仕切部材２０だけでなく、貫通孔３３，３４のある調整部材３５も設置し、液圧回路３０で脈動が発生した時、この貫通孔３３、３４の組み合わせにより、貫通孔を通すことにより、高粘性液体（重油）の流体抵抗による振幅の減衰、制振効果を有効に実現でき、圧力緩和性能を向上させることができた。 In the embodiment, the space formed by the liquid chamber end cover member 18 and the partition member 20 is used as the liquid chamber 3.
In this embodiment, not only the partition member 20 including the bellows end cover 25 but also the adjusting member 35 having the through holes 33 and 34 is installed between the liquid chamber 3 and the air chamber 4. When pulsation occurs, the combination of the through holes 33 and 34 allows the attenuation of the amplitude and the damping effect due to the fluid resistance of the highly viscous liquid (heavy oil) to be effectively realized by passing through the through hole, and the pressure relaxation performance is improved. I was able to improve.

図１に示す例では、貫通孔３３，３４を両者とも設けているが、本発明はこの例に限定されるものではない。例えば一方の貫通孔３３のみを設け、他方の貫通孔３４を設けない構成を採用してもよい。 In the example shown in FIG. 1, both of the through holes 33 and 34 are provided, but the present invention is not limited to this example. For example, a configuration in which only one through hole 33 is provided and the other through hole 34 is not provided may be employed.

そこで、調整部材３５に縦孔である貫通孔３４のみを設け、横孔である貫通孔３３を設けない場合、調整部材３５の底壁面とベローズエンドカバー２５の間に、貫通孔３４を囲むようにセルフシール材を設ける構成を採用してもよい。
このように、液室側が減圧状態になるとき、金属ベローズ２１は液室側へ押され変形する。貫通孔３４の周りにセルフシール材を設けているため、液室側が減圧されることによりベローズエンドカバー２５は気室４の中のガス体積調整液によって押圧され、最終的にはセルフシール材に接触、圧縮して密接する。その際、セルフシール材は調整部材３５と金属ベローズ２１の隙間の空間に対して圧力的に仕切り作用をし、液室の圧力がさらに下がっても、この空間の圧力を気室とバランスしていた圧力に保つことができるので、金属ベローズ２１の内側への変形を防止できる。 Therefore, when the adjustment member 35 is provided with only the through hole 34 that is a vertical hole and is not provided with the through hole 33 that is a horizontal hole, the through hole 34 is surrounded between the bottom wall surface of the adjustment member 35 and the bellows end cover 25. A structure in which a self-sealing material is provided on the surface may be adopted.
Thus, when the liquid chamber side is in a reduced pressure state, the metal bellows 21 is pushed to the liquid chamber side and deformed. Since the self-sealing material is provided around the through-hole 34, the bellows end cover 25 is pressed by the gas volume adjusting liquid in the air chamber 4 when the liquid chamber side is depressurized. Contact, compress and close. At that time, the self-sealing material pressure-separates the space between the adjustment member 35 and the metal bellows 21 and balances the pressure of the space with the air chamber even when the pressure of the liquid chamber further decreases. Therefore, deformation of the metal bellows 21 to the inside can be prevented.

しかしながら、本発明の前記実施例によると、ベローズエンドカバー２５が調整部材３５と直接接触することで同様の効果を得ることができる。また、金属ベローズ２１が押し潰されるのを回避することができるため、それによって、部品の数を少なくし、コスト減少の効果もある。
以上、特定の実施例に基づいて本発明を詳しく説明したが、本発明はこれに限るものではない。当業者であれば、本発明の請求項及その思想を逸脱しない範囲内で様々な変更、修正等を行うこともできる。 However, according to the embodiment of the present invention, the same effect can be obtained by the bellows end cover 25 being in direct contact with the adjusting member 35. Further, the metal bellows 21 can be prevented from being crushed, thereby reducing the number of parts and reducing the cost.
As mentioned above, although this invention was demonstrated in detail based on the specific Example, this invention is not limited to this. A person skilled in the art can make various changes and modifications without departing from the scope of the claims of the present invention and the concept thereof.

１筒体部（円筒状筒体部）
２圧力容器
３液室
４気室
１０アキュムレータ
１７気室エンドカバー部材
１８液室エンドカバー部材
２０仕切部材
２１金属ベローズ
２２ベローズガイド部材
２２ａ外周方向ガイド部
２２ｂ径方向ガイド部
２５ベローズエンドカバー
２６可動端
２７固定端
２８ひだ壁
３０液体出入口
３１ガス通路
３２気弁
３３横孔（貫通孔）
３４縦孔（貫通孔）
３５調整部材
Ｏ軸方向 1 cylinder part (cylindrical cylinder part)
2 pressure vessel 3 liquid chamber 4 air chamber 10 accumulator 17 air chamber end cover member 18 liquid chamber end cover member 20 partition member 21 metal bellows 22 bellows guide member 22a outer circumferential direction guide portion 22b radial direction guide portion 25 bellows end cover 26 movable end 27 fixed end 28 pleat wall 30 liquid inlet / outlet 31 gas passage 32 gas valve 33 side hole (through hole)
34 Vertical hole (through hole)
35 Adjustment member O Axial direction

Claims

A pressure vessel (2) and a partition member (20) which is housed in the pressure vessel (2) and partitions the internal space of the pressure vessel (2) into a liquid chamber (3) and an air chamber (4). An accumulator (10) comprising:
The pressure vessel (2) includes a cylindrical part (1), a liquid chamber end cover member (18) located at the liquid chamber side end of the cylindrical part (1), and the cylindrical part (1). An air chamber end cover member (17) located at the air chamber side end,
The partition member (20) includes a metal bellows (21) that can be expanded and contracted along the axial direction (O) of the cylindrical body portion (1).
A bellows end cover (25) liquid-tightly connected to the movable end (26) of the metal bellows (21),
The movable end (26) is movable together with the bellows end cover (25), and the metal bellows (21) is guided in the axial direction (O) by guidance of at least one bellows guide member (22) that slides. Stretch along,
The gas chamber (4) contains a gas volume adjusting liquid composed of gas and adjusting liquid, and the liquid flows into the liquid chamber (3) from the outside into the liquid chamber end cover member (18). A liquid inlet / outlet (30) through which liquid flows out of the liquid chamber (3) is provided;
The fixed end (27) of the metal bellows (21) is fixedly connected to the liquid chamber end cover member (18) in a liquid-tight manner, or the cylindrical body portion (1) on the liquid chamber end cover member (18) side. ) Liquid-tightly fixed and connected
The movable end (26) is positioned between the fixed end (27) and the air chamber end cover member (17) in the axial direction (O),
The bellows guide member (22) is interposed between adjacent pleat walls (28) of the metal bellows (21), or is fixedly connected to the bellows end cover (25), or the movable end (26). )
The bellows guide member (22) is separated from the liquid chamber (3) by the metal bellows (21),
The accumulator (10) is characterized in that the gas volume adjusting liquid does not contain S or P, or at least each of S and P contains a minute amount of mineral oil of 10 ppm or less.

A bottomed cylindrical adjustment member (35) is provided inside the metal bellows (21) in the radial direction. The accumulator (10) according to claim 1, wherein the accumulator (10) is connected to 18), and the adjustment member (35) is provided with a through hole.

The adjusting member (35) has the vertical hole (34) installed through the bottom of the bottomed cylindrical shape and / or the horizontal hole (33) installed through the bottomed cylindrical shape as the through hole. The accumulator (10) according to claim 2, characterized by comprising:

The bellows guide member (22) is installed at the movable end (26), and is interposed between the partition member (20) of the bellows guide member (22) and the cylindrical body portion (1). The accumulator (10) according to any one of claims 1 to 3, wherein the outer circumferential guide portion (22a) is in contact with the gas volume adjusting liquid.

The accumulator (10) according to any one of claims 1 to 4, wherein the metal bellows (21) is a bellows having a wavy cross section in the axial direction.

In the movable end (26), only the outer peripheral direction guide portion (22a) of the bellows guide member (22) is installed between the bellows end cover (25) and the cylindrical body portion (1). The accumulator (10) according to any one of the preceding claims, characterized in that it is characterized in that

The accumulator (10) according to any one of claims 1 to 6, wherein the bellows guide member (22) is made of nylon.

The air chamber end cover member (17) is provided with an inlet (31) for injecting a gas volume adjusting liquid into the air chamber (4), and the inlet (31) has the inlet (31). The accumulator (10) according to any one of claims 1 to 7, characterized in that a seal (32) is provided for sealing.

The accumulator (10) according to any one of claims 1 to 8, characterized in that the bellows end cover (25) can be in direct contact with the adjusting member (35).