JPH0652211B2 - Accumulator gas filling pressure measurement method - Google Patents
Accumulator gas filling pressure measurement methodInfo
- Publication number
- JPH0652211B2 JPH0652211B2 JP62230497A JP23049787A JPH0652211B2 JP H0652211 B2 JPH0652211 B2 JP H0652211B2 JP 62230497 A JP62230497 A JP 62230497A JP 23049787 A JP23049787 A JP 23049787A JP H0652211 B2 JPH0652211 B2 JP H0652211B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid
- pressure
- accumulator
- bladder
- gas charging
- 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 - Lifetime
Links
Landscapes
- Measuring Fluid Pressure (AREA)
- Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 この発明は、油圧回路において油圧の蓄積に用いるアキ
ュムレータに関するもので、更に述べると、アキュムレ
ータのガス封入圧力測定方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an accumulator used for accumulating hydraulic pressure in a hydraulic circuit, and more specifically to a method for measuring gas charging pressure of the accumulator.
従来の技術 ブラダ形アキュムレータは、容器主体内に気密的にブラ
ダを取付け、このブラダ内に充填手段により気体を充填
させ、前記容器主体内へブラダ内の気体圧力に対抗させ
て液体を出入りさせるものであるが、ブラダ内の気体が
ブラダのガス透過、或は給気口などからの漏れ等により
気体圧力が低下した時は、容器主体内へ規定以上の液体
が入り、ブラダは許容圧縮限界を越えて圧縮され、そし
て蓋の給気口等に押し込まれてブラダは破損する。2. Description of the Related Art A bladder type accumulator is one in which a bladder is airtightly installed in a container main body, a gas is filled in the bladder by a filling means, and a liquid is allowed to flow in and out of the container main body against a gas pressure in the bladder. However, when the gas pressure in the bladder drops due to gas permeation of the bladder or leakage from the air supply port, etc., the liquid above the specified level enters the container body and the bladder reaches the allowable compression limit. The bladder is broken by being compressed over and pushed into the air supply port of the lid.
このようにブラダが破損すると、ガスが液体側に漏れて
しまい、アキュムレータは、圧力液体の蓄積作用を行う
ことができないので、アキュムレータにとって致命的な
欠陥となる。When the bladder is damaged in this way, gas leaks to the liquid side, and the accumulator cannot perform the action of accumulating the pressure liquid, which is a fatal defect for the accumulator.
そこで、従来ブラダ内の気体圧力、即ち、ガス封入圧力
を検出するため、容器主体の蓋に、ブラダ内に突出する
ホルダを設け、該ホルダの先端部に検知器を設け、ブラ
ダの許容圧縮限界例えば、容器主体の３／４まで液体が
入り、ブラダが１／４まで圧縮された時に、ブラダが検
知器に接近若しくは、接触して検知器の発する超音波を
反射させ、その反射波で検知し、信号を発する位置検知
器付アキュムレータが用いられている。（特願昭５９−
１６８００号参照） 発明が解決しようとする問題点 従来例の位置検知器付アキュムレータは、ブラダ内に突
出するホルダの先端部に検知器を設けているので、ブラ
ダが軸方向の浮力を受ける状態、即ち、縦置で使用する
のに適しているが、横置、或は、傾斜状態で使用する
と、浮力を受けてブラダの中心軸が上方にずれてしま
い、ブラダは、縦置の場合と異なる変形を示すので、確
実なガス封入圧力を測定することが困難である。Therefore, in order to detect the gas pressure in the bladder, that is, the gas filling pressure, a holder that protrudes into the bladder is provided on the lid of the container main body, and a detector is provided at the tip of the holder to determine the allowable compression limit of the bladder. For example, when the liquid enters up to 3/4 of the container body and the bladder is compressed to 1/4, the bladder approaches or contacts the detector and reflects the ultrasonic waves emitted by the detector, and the reflected wave is detected. However, an accumulator with a position detector that emits a signal is used. (Japanese Patent Application Sho 59-
16800) Problems to be Solved by the Invention In the accumulator with position detector of the conventional example, since the detector is provided at the tip of the holder protruding into the bladder, the bladder is subject to the axial buoyancy, That is, it is suitable for vertical installation, but when it is used horizontally or in an inclined state, the central axis of the bladder shifts upward due to buoyancy, and the bladder differs from the vertical installation. Deformation makes it difficult to measure a reliable gas fill pressure.
そのため、このアキュムレータを横置で使用することは
不可能である。Therefore, it is impossible to use this accumulator horizontally.
また、構造が複雑であり、組み立てや分解が極めて困難
である上、ブラダがホルダに部分的に強圧接触して破損
することがある。In addition, the structure is complicated, assembly and disassembly are extremely difficult, and the bladder may be partially brought into strong pressure contact with the holder and damaged.
この発明は、上記事情に鑑み簡単にしかも確実にガス封
入圧力を測定する方法を提供することを目的とする。An object of the present invention is to provide a method for easily and surely measuring the gas charging pressure in view of the above circumstances.
問題点を解決するための手段 この発明は、ブラダを膨張させ、液圧回路に接続するア
キュムレータ内の液体を全部排出させた後前記液圧回路
に液体を圧送し、該液体のアキュムレータ内への流入開
始時における液体圧力をガス封入圧力とすることを特徴
とするアキュムレータのガス封入圧力測定方法である。Means for Solving the Problems The present invention is to expand a bladder, discharge all liquid in an accumulator connected to a hydraulic circuit, and then pump the liquid to the hydraulic circuit so that the liquid enters the accumulator. A method for measuring a gas charging pressure of an accumulator, characterized in that a liquid pressure at the start of inflow is set as a gas charging pressure.
作用 ブラダを膨張させると、液体室内の液体は、該ブラダに
押圧されて液圧回路に流出しアキュムレータ内の液体が
全部排出されると、流体出入口は弁体により閉鎖され
る。Action When the bladder is expanded, the liquid in the liquid chamber is pressed by the bladder and flows out into the hydraulic circuit, and when the liquid in the accumulator is completely discharged, the fluid inlet / outlet is closed by the valve body.
この状態において、液圧回路に液体を圧送すると、初め
に液圧回路内に液体が充填されその後液体は、弁体を押
し上げて流体出入口を開きアキュムレータ内に流入す
る。In this state, when the liquid is pressure-fed to the hydraulic circuit, the liquid is first filled in the hydraulic circuit, and then the liquid pushes up the valve body and opens the fluid inlet / outlet to flow into the accumulator.
このアキュムレータ内へ液体が流入開始する時、即ち、
液圧回路に液体を圧送し始めてから一定時間後に、圧力
センサにより液体圧力を測定し、その測定値をガス封入
圧力とする。When the liquid starts to flow into this accumulator, that is,
The liquid pressure is measured by a pressure sensor a fixed time after the liquid is started to be pressure-fed to the hydraulic circuit, and the measured value is used as the gas charging pressure.
実施例 この考案の実施例を添付図面により説明する。Embodiment An embodiment of the present invention will be described with reference to the accompanying drawings.
アキュムレータ１の内部は、ブラダ２により気体室３と
液体室４とに仕切られ、該液体室４は、流体出入口５を
介して液圧回路６に連結されて入る。The inside of the accumulator 1 is partitioned into a gas chamber 3 and a liquid chamber 4 by a bladder 2, and the liquid chamber 4 is connected to a hydraulic circuit 6 via a fluid inlet / outlet 5.
液圧回路６には、圧力測定器７とバルブ８とポンプ９が
順次直列に配設されている。１０は、圧力測定器７、バ
ルブ８、時間測定器１１を夫々接続したコンピュータで
ある。In the hydraulic circuit 6, a pressure measuring device 7, a valve 8 and a pump 9 are sequentially arranged in series. Reference numeral 10 is a computer to which the pressure measuring device 7, the valve 8 and the time measuring device 11 are respectively connected.
次に、この実施例の作動につき説明する。ブラダ２が、
膨張すると、液体室４内の液体は該ブラダ２に押圧さ
れ、流体出入口５から液圧回路６に流出する。Next, the operation of this embodiment will be described. Bladder 2
When expanded, the liquid in the liquid chamber 4 is pressed by the bladder 2 and flows out from the fluid inlet / outlet 5 to the hydraulic circuit 6.
そして、ブラダ２が、更に膨張しアキュムレータ内壁に
密着し２Ａの状態となると、アキュムレータ内の液体は
完全に排出されると共にクッションカップ１２、弁体１
３は、ブラダ２Ａに押圧されるので流体出入口５は閉鎖
される。When the bladder 2 further expands and comes into close contact with the inner wall of the accumulator to be in the state of 2A, the liquid in the accumulator is completely discharged and the cushion cup 12 and the valve body 1
Since 3 is pressed by the bladder 2A, the fluid inlet / outlet 5 is closed.
次にポンプ９を駆動して液槽１４内の液体を液圧回路６
に圧送し該液体のアキュムレータ内への流入開始時にお
ける液体圧力を圧力測定器７により測定する。Next, the pump 9 is driven to move the liquid in the liquid tank 14 to the hydraulic circuit 6.
The pressure of the liquid is measured by the pressure measuring device 7 when the liquid is pressure fed to the accumulator and starts to flow into the accumulator.
ところで、液圧回路６への液体圧送開始後圧力測定器７
により継続して液体圧力を測定すると、第２図のよう
に、最初の１秒間は、直線状ａに変化し、その後は、緩
やかな曲線状ｂに変化する。By the way, the pressure measuring device 7 after the start of the liquid pressure supply to the hydraulic circuit 6 is started.
When the liquid pressure is continuously measured by, the liquid pressure changes to a straight line a for the first 1 second and then changes to a gentle curved line b as shown in FIG.
これは、液体が非圧縮性である為液圧回路内に液体が充
満して液体圧力がブラダ内のガス圧力と等しくなるまで
は急激に変化し、その後、更に該液体圧力が増大する
と、弁体１３とブラダ２Ａが押圧され、流体出入口５が
開くと共に圧縮性のガスが圧縮され、ゆるやかに流体圧
力が変化するためである。This is because the liquid is incompressible and changes rapidly until the liquid is filled in the hydraulic circuit and the liquid pressure becomes equal to the gas pressure in the bladder. This is because the body 13 and the bladder 2A are pressed, the fluid inlet / outlet 5 is opened, the compressible gas is compressed, and the fluid pressure changes gently.
この第２図における直線ａと曲線ｂとの境目Ｐ即ち、１
秒後がガス封入圧力と流体圧力とがバランスしている時
であり、この時の流体圧力２２、３ｋｇ／cm2が流体圧
力即ちガス封入圧力となる。The boundary P between the straight line a and the curved line b in FIG. 2, that is, 1
The second is the time when the gas charging pressure and the fluid pressure are balanced, and the fluid pressure 22, 3 kg / cm 2 at this time is the fluid pressure, that is, the gas charging pressure.
又、実験によるるとアキュムレータ内への流入開始時
は、同一流体回路への流体圧送開始後、常に一定時間経
過後（所定時間という）、例えば、１秒経過後に流体が
アキュムレータ内に流入し始めることが判明した。Further, according to experiments, at the start of inflow into the accumulator, after the fluid starts to be pumped into the same fluid circuit, the fluid always starts to flow into the accumulator after a lapse of a fixed time (called a predetermined time), for example, 1 second. It has been found.
従って、この所定時間を予め測定しておき、時間測定器
によりその時間を検出し、その時の流体圧力即ち、ガス
封入圧力を求めてもよい。なお、圧力測定器７による液
体圧力の測定や時間測定器１１による所定時間の測定
は、人手によって行ってもよいが、各測定器７、１１を
コンピュータ１０に接続し、自動的に行うこともでき
る。Therefore, the predetermined time may be measured in advance, the time may be detected by the time measuring device, and the fluid pressure at that time, that is, the gas charging pressure may be obtained. The measurement of the liquid pressure by the pressure measuring device 7 and the measurement of the predetermined time by the time measuring device 11 may be performed manually, but may be automatically performed by connecting the measuring devices 7 and 11 to the computer 10. it can.
発明の効果 この発明は、以上のようにブラダを膨張させ液圧回路に
接続するアキュムレータ内の液体を全部排出させた後、
前記液圧回路に液体を圧送し、該液体のアキュムレータ
内への流入開始時における流体圧力を測定すると、ガス
封入圧力を簡単に検出することができる。EFFECTS OF THE INVENTION The present invention expands the bladder as described above, and after discharging all the liquid in the accumulator connected to the hydraulic circuit,
When the liquid is pressure-fed to the hydraulic circuit and the fluid pressure at the time when the liquid starts to flow into the accumulator is measured, the gas charging pressure can be easily detected.
第１図は、この発明の実施例を示す図、第２図は、液体
圧力と時間との関係を示す図である １……アキュムレータ ２……ブラダ ７……圧力測定器FIG. 1 is a diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing a relationship between liquid pressure and time. 1 ... Accumulator 2 ... Bladder 7 ... Pressure measuring device
Claims (8)
キュムレータ内の液体を全部排出させた後、前記液圧回
路に液体を圧送し、該液体のアキュムレータ内への流入
開始時における液体圧力をガス封入圧力とすることを特
徴とするアキュムレータのガス封入圧力測定方法。1. A bladder is expanded to discharge all the liquid in an accumulator connected to the hydraulic circuit, and then the liquid is pumped to the hydraulic circuit to start the flow of the liquid into the accumulator. Is a gas charging pressure, and a method of measuring a gas charging pressure of an accumulator.
が、液圧回路に液体の圧送開始後、所定時間経過後であ
ることを特徴とする特許請求の範囲第１項記載のアキュ
ムレータのガス封入圧力測定方法。2. The gas charging of the accumulator according to claim 1, wherein the liquid starts to flow into the accumulator after a lapse of a predetermined time after the liquid starts to be pumped into the hydraulic circuit. Pressure measurement method.
過後に液体圧力を測定することを特徴とする特許請求の
範囲第１項記載のアキュムレータのガス封入圧力測定方
法。3. The method for measuring gas charging pressure in an accumulator according to claim 1, wherein the liquid pressure is measured after a predetermined time has elapsed after the liquid was started to be pumped into the hydraulic circuit.
時、ブラダが液体出入口を閉鎖することを特徴とする特
許請求の範囲第１項記載のアキュムレータのガス封入圧
力測定方法。4. The method for measuring gas charging pressure in an accumulator according to claim 1, wherein the bladder closes the liquid inlet / outlet when all the liquid in the accumulator is discharged.
特徴とする特許請求の範囲第４項記載のアキュムレータ
のガス封入圧力測定方法。5. The method for measuring the gas charging pressure of an accumulator according to claim 4, wherein a valve body is provided at the liquid inlet / outlet port.
とを特徴とする特許請求の範囲第１項記載のアキュムレ
ータのガス封入圧力測定方法。6. A method for measuring a gas charging pressure of an accumulator according to claim 1, wherein a pressure measuring device is provided in the hydraulic circuit.
いることを特徴とする特許請求の範囲第６項記載のアキ
ュムレータのガス封入圧力測定方法7. A method for measuring a gas charging pressure of an accumulator according to claim 6, wherein the pressure measuring device is connected to a computer.
いることを特徴とする特許請求の範囲第７項記載のアキ
ュムレータのガス封入圧力測定方法。8. The method for measuring a gas charging pressure of an accumulator according to claim 7, wherein the computer is connected to a time measuring device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62230497A JPH0652211B2 (en) | 1987-09-14 | 1987-09-14 | Accumulator gas filling pressure measurement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62230497A JPH0652211B2 (en) | 1987-09-14 | 1987-09-14 | Accumulator gas filling pressure measurement method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6473232A JPS6473232A (en) | 1989-03-17 |
| JPH0652211B2 true JPH0652211B2 (en) | 1994-07-06 |
Family
ID=16908696
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62230497A Expired - Lifetime JPH0652211B2 (en) | 1987-09-14 | 1987-09-14 | Accumulator gas filling pressure measurement method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0652211B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130253854A1 (en) * | 2012-03-22 | 2013-09-26 | Caterpillar Inc. | Hydraulic accumulator health diagnosis |
| WO2013142541A2 (en) * | 2012-03-22 | 2013-09-26 | Caterpillar Inc. | Hydraulic accumulator pre-charge pressure detection |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4116482A1 (en) * | 1991-05-21 | 1992-11-26 | Hydac Technology Gmbh | METHOD FOR MEASURING THE PRESSURE OF A GAS IN A GAS PRESSURE STORAGE AND DEVICE FOR CARRYING OUT THE SAME |
| JP2010274847A (en) * | 2009-05-29 | 2010-12-09 | Hitachi Automotive Systems Ltd | Volume compensation accumulator device and suspension device using the same |
| CN117628308B (en) * | 2024-01-25 | 2024-04-09 | 日照艾迪尔流体设备有限公司 | Pulsation damper and testing device thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60159401A (en) * | 1984-01-31 | 1985-08-20 | Nobuyuki Sugimura | Bladder-type accumulator |
-
1987
- 1987-09-14 JP JP62230497A patent/JPH0652211B2/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130253854A1 (en) * | 2012-03-22 | 2013-09-26 | Caterpillar Inc. | Hydraulic accumulator health diagnosis |
| WO2013142541A2 (en) * | 2012-03-22 | 2013-09-26 | Caterpillar Inc. | Hydraulic accumulator pre-charge pressure detection |
| WO2013142541A3 (en) * | 2012-03-22 | 2013-11-14 | Caterpillar Inc. | Hydraulic accumulator pre-charge pressure detection |
| CN104204544A (en) * | 2012-03-22 | 2014-12-10 | 卡特彼勒公司 | Hydraulic accumulator pre-charge pressure detection |
| US9366269B2 (en) * | 2012-03-22 | 2016-06-14 | Caterpillar Inc. | Hydraulic accumulator health diagnosis |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6473232A (en) | 1989-03-17 |
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