JP4172668B2 - accumulator - Google Patents

accumulator Download PDF

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Publication number
JP4172668B2
JP4172668B2 JP05656599A JP5656599A JP4172668B2 JP 4172668 B2 JP4172668 B2 JP 4172668B2 JP 05656599 A JP05656599 A JP 05656599A JP 5656599 A JP5656599 A JP 5656599A JP 4172668 B2 JP4172668 B2 JP 4172668B2
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JP
Japan
Prior art keywords
bellows
cylindrical
accumulator
liquid
cylindrical protrusion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP05656599A
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Japanese (ja)
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JP2000257991A (en
Inventor
寛二 大西
拓也 斉藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IHI Aerospace Co Ltd
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IHI Aerospace Co Ltd
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Filing date
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Priority to JP05656599A priority Critical patent/JP4172668B2/en
Publication of JP2000257991A publication Critical patent/JP2000257991A/en
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Publication of JP4172668B2 publication Critical patent/JP4172668B2/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02Installations or systems with accumulators
    • F15B1/04Accumulators
    • F15B1/08Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • F15B1/10Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means
    • F15B1/103Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means the separating means being bellows
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00Accumulators
    • F15B2201/20Accumulator cushioning means
    • F15B2201/205Accumulator cushioning means using gas
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00Accumulators
    • F15B2201/30Accumulator separating means
    • F15B2201/315Accumulator separating means having flexible separating means
    • F15B2201/3153Accumulator separating means having flexible separating means the flexible separating means being bellows

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、液体の体積変化を吸収するアキュムレータに関する。
【0002】
【従来の技術】
液体を循環させるループ配管には液体の膨張収縮を吸収するためアキュムレータが設けられている。図3はループ配管の一例を示す。冷媒ループ配管30には冷媒を循環させるポンプ31と、冷媒を冷却する熱交換器32と、冷媒により冷却される負荷33が接続され、冷媒の体積膨張を吸収するアキュムレータ34が設けられている。
【0003】
図4はアキュムレータの構成を示す。中空の円筒体1の一端には第1端材2が設けられ、他端には第2端材3が取り付けられている。円筒体1の内面と摺動可能に嵌合して移動体4が設けられている。この移動体4の第1端材2側には円筒状の突起5が設けられている。一端を第1端材2に固定され他端を移動体4に固定され内径が円筒状突起5の外径より大きい円筒状のベローズ6が設けられている。第1端材2、移動体4が有する円筒状突起5、ベローズ6で囲まれる空間が液体室7を構成し、円筒体1、第2端材3、移動体4が有する円筒状突起5、ベローズ6で囲まれる空間が気体室8を構成する。第1端材2には開口9が設けられ、液体が出入りし、気体室8には封入口10が設けられ加圧気体が供給された後、密封される。
【0004】
【発明が解決しようとする課題】
このようなアキュムレータを有するループ配管はロケットで宇宙基地に打ち上げられる装置に装備されており、打ち上げ時激しい振動が発生する。振動はアキュムレータの軸方向(円筒体1の軸方向)と直角方向にも生じ、液体室7の液体がこの方向に振動し、ベローズ6の付け根部に大きな応力が発生し、ここで疲労破損が発生する場合があった。このため従来は図5に示すように円筒状突起5を第1端材2に押しつけ、液体室7の液体を少なくした状態で打ち上げを行っていた。しかしこのようにすると打ち上げ時はアキュムレータとして機能できなくなるという問題があった。
【0005】
本発明は、上述の問題点に鑑みてなされたもので、振動時も動作できるアキュムレータを提供することを目的とする。
【0006】
【課題を解決するための手段】
上記目的を達成するため、請求項1の発明では、一方の端面を第1端材で塞ぎ、他方の端面を第2端材で塞いだ中空円筒体と、この円筒体内面を摺動し第1端材側に円筒状突起を有する移動体と、前記第1端材に一端が接合し前記移動体に他端が接合し前記円筒状突起の外側に取り付けられた円筒状ベローズとを備えたアキュムレータにおいて、一端を前記第1端材に取り付け、外径が前記ベローズの内径より小さく、内径が前記円筒状突起の外径より大きい中空のベローズ保護円筒を設け、前記ベローズ保護円筒が前記円筒状ベローズの内側に位置しており、前記ベローズ保護円筒内に液体が供給され、前記ベローズ保護円筒内を前記円筒状突起が移動することで前記ベローズ保護円筒内に収容される液体量が変化するようになっている
【0007】
かかるベローズ保護円筒を設けることにより、円筒軸方向に直角方向の振動に対し、アキュムレータ内のかなりの部分の液体をベローズ保護円筒内に閉じ込めることができるので、ベローズに加わる振動力を大幅に少なくし、ベローズ付け根に発生する応力も少なくすることができる。
【0008】
【発明の実施の形態】
以下、本発明の実施形態を図面を参照して説明する。
図1は実施形態のアキュムレータの構成を示す。図2は液体室の体積を最も小さくした状態を示す。なお、図4と同じ符号は同じものを示す。中空の円筒体1の一端には第1端材2が設けられ、他端には第2端材3が取り付けられている。これらの第1端材2、第2端材3は円筒体1に対し、装着後、溶接等により固着するように構成されている。円筒体1の内面と摺動可能に嵌合して移動体4が設けられている。移動体4は円筒状で外周にはテフロンなどの滑り材4aが設けられ、円筒体1の内面を摺動する。この摺動により液体室7と気体室8の体積が変化する。この移動体4の第1端材2側には円筒状の突起5が設けられている。この移動体4と突起5の体積は後述する気体室8の体積に含まれる。
【0009】
一端を第1端材2に固定され他端を移動体4に固定され、内径が円筒状突起5の外径より大きい円筒状のベローズ6が設けられている。第1端材2、移動体4が有する円筒状突起5、ベローズ6で囲まれる空間が液体室7を構成し、円筒体1、第2端材3、移動体4が有する円筒状突起5、ベローズ6で囲まれる空間が気体室8を構成する。第1端材2には開口9が設けられ、液体が出入りし、気体室8には封入口10が設けられ加圧気体が供給された後、密封される。
【0010】
以上の構成は図4に示した従来の構造部分である。本発明では、第1端材2の内面側にベローズ保護円筒11を設けている。ベローズ保護円筒11は外径がベローズ6の内径よりやや小さく、内径が移動体4の円筒状突起5の円筒の外径よりも大きな円筒である。また高さは円筒状突起5の高さとほぼ同じで、図2に示すように円筒状突起5を第1端材2に押し当てたとき、先端が円筒状突起5の付け根と多少の間隙を生ずる程度の寸法とする。
【0011】
次に振動時の動作について説明する。円筒軸方向と直角方向に振動が加わる場合、図1に示すように液体室7内のかなりの部分の液体はベローズ保護円筒11内で振動するため、ベローズ6に液体から加わる振動力は少なく、ベローズ付け根に発生する応力も少なくなる。なお、円筒軸方向の振動に対しては、ベローズ6の全体が均等に伸縮するので、付け根部に大きな応力は発生しない。
【0012】
【発明の効果】
以上の説明より明らかなように、本発明は、アキュムレータの中にベローズ保護円筒を設けることにより、ベローズにとって最も厳しい方向からの振動に対してもベローズに発生する応力を少なくし、ベローズを保護し、振動中もアキュムレータの機能を発揮させることができる。またベローズに発生する応力を少なくすることにより寿命を長くすることができる。
【図面の簡単な説明】
【図1】本発明のアキュムレータの構成を示す図である。
【図2】本発明のアキュムレータの液体室の体積を最も小さくした状態を示す。
【図3】アキュムレータを備えたループ配管の一例を示す。
【図4】従来のアキュムレータの構成を示す図である。
【図5】従来のアキュムレータの液体室の体積を最も小さくした状態を示す。
【符号の説明】
1 円筒体
2 第1端材
3 第2端材
4 移動体
4a 滑り材
5 円筒状突起
6 ベローズ
7 液体室
8 気体室
9 開口
10 封入口
11 ベローズ保護円筒
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an accumulator that absorbs a volume change of a liquid.
[0002]
[Prior art]
An accumulator is provided in the loop piping for circulating the liquid to absorb the expansion and contraction of the liquid. FIG. 3 shows an example of loop piping. The refrigerant loop pipe 30 is connected to a pump 31 that circulates the refrigerant, a heat exchanger 32 that cools the refrigerant, and a load 33 that is cooled by the refrigerant, and an accumulator 34 that absorbs the volume expansion of the refrigerant.
[0003]
FIG. 4 shows the configuration of the accumulator. A first end member 2 is provided at one end of the hollow cylindrical body 1, and a second end member 3 is attached to the other end. A movable body 4 is slidably fitted to the inner surface of the cylindrical body 1. A cylindrical protrusion 5 is provided on the moving body 4 on the first end member 2 side. A cylindrical bellows 6 having one end fixed to the first end member 2 and the other end fixed to the moving body 4 and having an inner diameter larger than the outer diameter of the cylindrical protrusion 5 is provided. A space surrounded by the first end member 2, the cylindrical protrusion 5 included in the moving body 4, and the bellows 6 constitutes a liquid chamber 7, and the cylindrical protrusion 5 included in the cylindrical body 1, the second end member 3 and the moving body 4, A space surrounded by the bellows 6 constitutes the gas chamber 8. An opening 9 is provided in the first end material 2, and a liquid enters and exits, and a gas inlet 8 is provided in the gas chamber 8 and is sealed after a pressurized gas is supplied.
[0004]
[Problems to be solved by the invention]
A loop pipe having such an accumulator is installed in a device that can be launched by a rocket to a space station, and a severe vibration is generated at the time of launch. The vibration also occurs in a direction perpendicular to the axial direction of the accumulator (the axial direction of the cylindrical body 1), the liquid in the liquid chamber 7 vibrates in this direction, and a large stress is generated at the base of the bellows 6, where fatigue failure occurs. It may occur. For this reason, conventionally, as shown in FIG. 5, the cylindrical protrusion 5 is pressed against the first end material 2, and the launch is performed in a state where the liquid in the liquid chamber 7 is reduced. However, if this is done, there is a problem that it cannot function as an accumulator at launch.
[0005]
The present invention has been made in view of the above-described problems, and an object thereof is to provide an accumulator that can operate even during vibration.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, there is provided a hollow cylindrical body in which one end surface is closed with a first end member and the other end surface is closed with a second end member, and an inner surface of the cylindrical body is slid. A moving body having a cylindrical protrusion on one end material side, and a cylindrical bellows having one end joined to the first end material and the other end joined to the moving body and attached to the outside of the cylindrical protrusion. In the accumulator, one end is attached to the first end member, a hollow bellows protective cylinder having an outer diameter smaller than an inner diameter of the bellows and an inner diameter larger than the outer diameter of the cylindrical protrusion is provided, and the bellows protective cylinder is the cylindrical shape It is located inside the bellows so that liquid is supplied into the bellows protection cylinder, and the amount of liquid accommodated in the bellows protection cylinder changes as the cylindrical protrusion moves in the bellows protection cylinder. It has become .
[0007]
By providing such a bellows protection cylinder, a considerable part of the liquid in the accumulator can be confined in the bellows protection cylinder against vibration perpendicular to the cylinder axis direction, so that the vibration force applied to the bellows is greatly reduced. The stress generated at the base of the bellows can also be reduced.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows the configuration of the accumulator of the embodiment. FIG. 2 shows a state in which the volume of the liquid chamber is minimized. The same reference numerals as those in FIG. 4 denote the same components. A first end member 2 is provided at one end of the hollow cylindrical body 1, and a second end member 3 is attached to the other end. The first end material 2 and the second end material 3 are configured to be fixed to the cylindrical body 1 by welding after mounting. A movable body 4 is slidably fitted to the inner surface of the cylindrical body 1. The movable body 4 has a cylindrical shape and is provided with a sliding material 4 a such as Teflon on the outer periphery, and slides on the inner surface of the cylindrical body 1. The volume of the liquid chamber 7 and the gas chamber 8 changes by this sliding. A cylindrical protrusion 5 is provided on the moving body 4 on the first end member 2 side. The volume of the moving body 4 and the protrusion 5 is included in the volume of the gas chamber 8 described later.
[0009]
A cylindrical bellows 6 having one end fixed to the first end member 2 and the other end fixed to the moving body 4 and having an inner diameter larger than the outer diameter of the cylindrical protrusion 5 is provided. A space surrounded by the first end member 2, the cylindrical protrusion 5 included in the moving body 4, and the bellows 6 constitutes a liquid chamber 7, and the cylindrical protrusion 5 included in the cylindrical body 1, the second end member 3 and the moving body 4, A space surrounded by the bellows 6 constitutes the gas chamber 8. An opening 9 is provided in the first end material 2, and a liquid enters and exits, and a gas inlet 8 is provided in the gas chamber 8 and is sealed after a pressurized gas is supplied.
[0010]
The above configuration is the conventional structure shown in FIG. In the present invention, the bellows protection cylinder 11 is provided on the inner surface side of the first end member 2. The bellows protection cylinder 11 is a cylinder whose outer diameter is slightly smaller than the inner diameter of the bellows 6 and whose inner diameter is larger than the outer diameter of the cylindrical projection 5 of the movable body 4. Further, the height is substantially the same as the height of the cylindrical protrusion 5, and when the cylindrical protrusion 5 is pressed against the first end member 2 as shown in FIG. 2, the tip has a slight gap from the root of the cylindrical protrusion 5. The dimensions are such that they are generated.
[0011]
Next, the operation during vibration will be described. When vibration is applied in a direction perpendicular to the cylinder axis direction, a substantial portion of the liquid in the liquid chamber 7 vibrates in the bellows protective cylinder 11 as shown in FIG. Less stress is generated at the base of the bellows. In addition, since the whole bellows 6 expands and contracts uniformly with respect to the vibration in the cylindrical axis direction, a large stress is not generated at the base portion.
[0012]
【The invention's effect】
As is apparent from the above description, the present invention protects the bellows by providing a bellows protection cylinder in the accumulator to reduce the stress generated in the bellows even from vibrations in the most severe direction for the bellows. The function of the accumulator can be exhibited even during vibration. Further, the lifetime can be extended by reducing the stress generated in the bellows.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of an accumulator according to the present invention.
FIG. 2 shows a state where the volume of the liquid chamber of the accumulator of the present invention is minimized.
FIG. 3 shows an example of a loop pipe provided with an accumulator.
FIG. 4 is a diagram showing a configuration of a conventional accumulator.
FIG. 5 shows a state where the volume of a liquid chamber of a conventional accumulator is minimized.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cylindrical body 2 1st end material 3 2nd end material 4 Moving body 4a Sliding material 5 Cylindrical protrusion 6 Bellows 7 Liquid chamber 8 Gas chamber 9 Opening 10 Sealing port 11 Bellows protection cylinder

Claims (1)

一方の端面を第1端材で塞ぎ、他方の端面を第2端材で塞いだ中空円筒体と、この円筒体内面を摺動し第1端材側に円筒状突起を有する移動体と、前記第1端材に一端が接合し前記移動体に他端が接合し前記円筒状突起の外側に取り付けられた円筒状ベローズとを備えたアキュムレータにおいて、一端を前記第1端材に取り付け、外径が前記円筒状ベローズの内径より小さく、内径が前記円筒状突起の外径より大きい中空のベローズ保護円筒を設け、
前記ベローズ保護円筒が前記円筒状ベローズの内側に位置しており、前記ベローズ保護円筒内に液体が供給され、前記ベローズ保護円筒内を前記円筒状突起が移動することで前記ベローズ保護円筒内に収容される液体量が変化するようになっている、ことを特徴とするアキュムレータ。
A hollow cylindrical body in which one end face is closed with a first end piece and the other end face is closed with a second end piece; a moving body that slides on the inner surface of the cylindrical body and has a cylindrical protrusion on the first end piece side; An accumulator comprising one end joined to the first end material and the other end joined to the movable body and attached to the outside of the cylindrical projection, and one end is attached to the first end material, A hollow bellows protective cylinder having a diameter smaller than the inner diameter of the cylindrical bellows and an inner diameter larger than the outer diameter of the cylindrical protrusion is provided.
The bellows protective cylinder is located inside the cylindrical bellows, and liquid is supplied into the bellows protective cylinder, and the cylindrical protrusion moves in the bellows protective cylinder to be accommodated in the bellows protective cylinder. The accumulator is characterized in that the amount of liquid to be changed is changed .
JP05656599A 1999-03-04 1999-03-04 accumulator Expired - Fee Related JP4172668B2 (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
JP05656599A JP4172668B2 (en) 1999-03-04 1999-03-04 accumulator

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Publication Number Publication Date
JP2000257991A JP2000257991A (en) 2000-09-22
JP4172668B2 true JP4172668B2 (en) 2008-10-29

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Publication number Priority date Publication date Assignee Title
WO2016194609A1 (en) * 2015-05-29 2016-12-08 イーグル工業株式会社 Metal bellows-type accumulator

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