EP0003925B1 - Accumulateur hydro-pneumatique à piston muni d'un dispositif détecteur de manque de gaz - Google Patents

Accumulateur hydro-pneumatique à piston muni d'un dispositif détecteur de manque de gaz Download PDF

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Publication number
EP0003925B1
EP0003925B1 EP79400082A EP79400082A EP0003925B1 EP 0003925 B1 EP0003925 B1 EP 0003925B1 EP 79400082 A EP79400082 A EP 79400082A EP 79400082 A EP79400082 A EP 79400082A EP 0003925 B1 EP0003925 B1 EP 0003925B1
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EP
European Patent Office
Prior art keywords
piston
gas
accumulator
commutator
movable means
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
Application number
EP79400082A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0003925A1 (fr
Inventor
Jean Louis Gratzmuller
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Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Publication of EP0003925A1 publication Critical patent/EP0003925A1/fr
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Publication of EP0003925B1 publication Critical patent/EP0003925B1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • F15B1/24—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with rigid separating means, e.g. pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/20—Accumulator cushioning means
    • F15B2201/205—Accumulator cushioning means using gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/31—Accumulator separating means having rigid separating means, e.g. pistons
    • F15B2201/312—Sealings therefor, e.g. piston rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/41—Liquid ports
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/50—Monitoring, detection and testing means for accumulators
    • F15B2201/515—Position detection for separating means

Definitions

  • the present invention relates to hydro-pneumatic piston accumulators and in particular those provided with a gas shortage warning device which are used in oleo-pneumatic controls of electric circuit breakers.
  • the first oil-pneumatic orders for high-voltage circuit breakers date from 1952, 25 years ago.
  • the reserve of hydraulic energy, immediately usable is stored in one (or more) hydro-pneumatic accumulator, in the form of a mattress of compressed gas, confined permanently in the gas chamber of the accumulator and pre-inflated to a pressure predetermined.
  • hydro-pneumatic piston accumulators are essentially constituted by a cylinder which is closed by two bottoms and which is divided, by a free piston, into two compartments, one containing a gas under pressure and the other a liquid , usually oil. These devices are used as a reserve of pressurized oil to actuate engine members, such as jacks, the accumulator being recharged with oil by a pump according to its consumption.
  • the metals constituting these three basic elements must be perfectly waterproof, which is not as obvious as it appears at first.
  • pre-inflation pressure an inert gas under a determined pressure
  • Control systems have already been proposed triggering a warning signal when the piston comes too close to one of the bottoms of the cylinder and, in particular when the piston comes too close to the bottom of the gas compartment.
  • hydro-pneumatic accumulators for example the supply of hydraulic controls for electric circuit breakers, the user even requires that such a safety system, by controlling the lack of gas, be incorporated in the accumulator.
  • the simplest include an outgoing sliding rod, crossing the bottom of the cylinder on the gas side and projecting inside the gas compartment.
  • the piston acts in pushing on the rod and the external end of this rod activates a warning system, for example activates an electric switch which closes a warning circuit.
  • This outgoing rod solution requires additional sealing, which can be a source of gas leakage.
  • the bottom of the cylinder, gas side is made of non-magnetic metal; that the permanent magnet is movable in a blind hole in this bottom opening out only in the gas compartment; and that the switch is housed in a second blind hole, adjacent to the first, but opening only to the outside, any additional sealing is avoided and, therefore, any risk of gas leakage caused by the control device itself even.
  • a simple means of verification would be to charge the accumulator with oil under sufficient pressure to bring the free piston closer to the bottom on the gas side, until the control device is triggered. But, in practice, this would cause the pressure in the accumulator to rise to a value higher than the normal operating pressure and which would approach the limit safety test pressures of the accumulator, which is strictly prohibited and dangerous. .
  • the accumulator should be re-charged with gas at normal pressure, an operation which must be carried out by specialists and which, preferably, is carried out in the factory, by the manufacturer of the accumulator.
  • the present invention aims to remedy these drawbacks and allow the user to check, upon commissioning and even periodically thereafter, the proper functioning of the detector and gas shortage warning device.
  • the subject of the invention is a hydro-pneumatic accumulator of the aforementioned type, comprising a gas shortage warning system controlled by a movable member actuated in thrust by the piston, when the latter approaches closer to the bottom on the gas side than a first predetermined distance, said accumulator being characterized in that connecting means, with movement reversal, acting in traction, are interposed between the piston and the movable member, and in that said connecting means have a dead stroke of predetermined length, whereby said movable member is also moved in the same direction as when it is actuated directly in thrust by the piston and, therefore in the direction of actuation of the warning system, when the piston moves away from the bottom of the cylinder on the gas side, further than a second predetermined distance.
  • the device according to the invention also has the advantage that, during verification, all the elements of the control system operate in the same way and in the same direction as when this control system actually functions to signal a loss of gas.
  • the device according to the invention makes it possible to signal, in addition to the lack of gas, any abnormal approximation of the piston relative to the bottom on the oil compartment side, approximation which would mean that there has a lack of oil (or abnormal oil consumption).
  • the aforementioned connecting means comprise a lever movement reversing system of the first kind as well as a dead travel connecting member working in traction interposed between the piston and a first end of said lever, the second end of said lever cooperating with said movable member, whereby a tensile force exerted by the connecting member on the lever is transformed into a pushing force on the movable member.
  • the connecting means acting in traction and having a dead stroke comprise a flexible link interposed between the piston and the first end of the aforementioned lever.
  • the hydro-pneumatic accumulator shown in FIG. 1 comprises, as is conventional, a cylinder 2, two cylinder bottoms 4 and 6 and a free piston 8 which separates the volume of the cylinder into a gas compartment 10 and a liquid compartment 12.
  • a cylinder 2 two cylinder bottoms 4 and 6 and a free piston 8 which separates the volume of the cylinder into a gas compartment 10 and a liquid compartment 12.
  • the conventional gas inflation system of the gas compartment has not been shown.
  • the accumulator is provided with a simple device for detecting a lack of gas.
  • This device comprises a movable member constituted by a rod 14 which passes through the bottom 4, on the side of the gas compartment, by a bore 15 provided with a seal 18.
  • the end of the rod 14 protrudes from the inside the gas compartment so that, when the piston 8 approaches the bottom 4 closer than a predetermined distance D, as a result of a lack of gas, said piston acts in thrust on the rod whose outgoing end activates a gas shortage warning system, for example an electric switch 16, mounted in a housing 19.
  • the switch 16 is mounted in an electric warning circuit (not shown) such that the closing of the switch 16 causes the supply an optical or audible device or a device which automatically triggers the intervention of a safety device.
  • these connecting means comprise a flexible link, such as an inextensible cord 28, one end of which is fixed, by hooking means 30, to the piston 8, and the other end of which is fixed on a lever 32.
  • the lever 32 which constitutes a movement reversal member, is pivotally mounted at 34 on a yoke 36 integral with the bottom 4.
  • the end of the lever 32 opposite the point of attachment of the cord 28 is preferably in fork shape and embraces the rod 14 between the collar 22 and a stop 38.
  • the cord 28 is given a length such that this connection system has a dead stroke of predetermined length before acting on the rod 14.
  • the rod 14 is also moved, in the same direction as if the piston 8 were to act in push against it, which makes the gas shortage warning system work and makes it possible to check its good working order.
  • the device according to the invention also gives an indication of the position of the free piston in the accumulator and signals an excessive approach of the piston relative to the bottom 6 on the oil side, an approach which would mean that the oil filling is insufficient. , for example due to leakage, abnormal consumption or insufficient flow from the recharge pump.
  • the gas shortage detector comprises a movable rod 14 'which slides in a blind hole 15' dug in the bottom 4 ', gas side, of the accumulator and which can be actuated by pushed by piston 8 in the event of lack of gas.
  • the rod 14 ' carries a spout 40 which can close a switch 16' arranged inside the gas compartment and which controls the electric circuit warning of lack of gas.
  • the conductors 42-44 connected to the switch 16 pass through the bottom 4 'through fittings tightened by insulating cable glands 46.
  • a switch 16 ′ or a micro-switch can without disadvantage be placed in the gas compartment which is filled with an inert gas such as nitrogen for example, but of course, this switch could be of the type with magnetic control of nearby, the rod 14 'then carrying a permanent magnet.
  • connection device for reversing the direction of travel is simply constituted by a flexible place 28 which is fixed to the piston 8, which passes through a return guide 48 fixed to the bottom 4 ', and which is hooked by a collar 50 to the rod 14 '.
  • the operation of this embodiment, for verifying the good condition of the gas shortage detection device, is identical to that which has been described in connection with FIG. 1.
  • the invention is applied to an accumulator provided with a gas shortage detection system of the type described in the aforementioned French patent.
  • the movable member against which the free piston 8 comes to push is constituted by a rod 14 "which slides in a blind hole 16 'and which carries a permanent magnet 52.
  • a magnetic controlled proximity switch 56 is mounted, of the type with flexible blades in a sealed bulb (switch known as a "reed switch” or "ILS").
  • the bottom 4 being made of non-magnetic material, the magnet 52, when it is inserted into the hole 16 ′, actuates the switch 54.
  • this part is constituted by a perforated plate 58 which slides freely in the cylinder 2 and which is carried by a rod 60 fixed on the pisto n 8.
  • the traction connection interposed between the piston 8 (and more precisely between the plate 58) and the movable rod 14 "comprises a cord 62 which actuates, when stretched, a lever 32 similar to the lever 32 shown in FIG. 1.
  • This lever 32 pivots at 34 in a box 64 which is fixed to the bottom 4 "and which houses the return spring 20 for the rod 14".
  • the bottom of this box serves as a stop for the lever 32 and the 14 "rod.
  • FIG. 3 has the advantage of not requiring any additional sealing (movable as in the case of FIG. 1 or fixed as in the case of FIG. 2) through the bottom 4 "of the accumulator.
  • a flexible link such as an inextensible cord has above all been described as a connecting member working in traction, but it is understood that a telescopic link or a foldable link or even a rollable link could also be used.

Landscapes

  • 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)
EP79400082A 1978-02-27 1979-02-07 Accumulateur hydro-pneumatique à piston muni d'un dispositif détecteur de manque de gaz Expired EP0003925B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7805511A FR2418356A1 (fr) 1978-02-27 1978-02-27 Accumulateur hydro-pneumatique a piston muni d'un dispositif detecteur de manque de gaz
FR7805511 1978-02-27

Publications (2)

Publication Number Publication Date
EP0003925A1 EP0003925A1 (fr) 1979-09-05
EP0003925B1 true EP0003925B1 (fr) 1981-01-07

Family

ID=9205084

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79400082A Expired EP0003925B1 (fr) 1978-02-27 1979-02-07 Accumulateur hydro-pneumatique à piston muni d'un dispositif détecteur de manque de gaz

Country Status (11)

Country Link
US (1) US4243856A (ru)
EP (1) EP0003925B1 (ru)
JP (1) JPS5911761B2 (ru)
AT (1) AT376280B (ru)
BR (1) BR7901156A (ru)
CA (1) CA1094921A (ru)
DE (1) DE2960110D1 (ru)
FR (1) FR2418356A1 (ru)
HU (1) HU182878B (ru)
IN (1) IN151113B (ru)
SU (1) SU953993A3 (ru)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4531433A (en) * 1979-11-29 1985-07-30 Nissan Motor Co., Ltd. Hydraulically controlled automatic transmission
DE3143029A1 (de) * 1981-10-27 1983-05-05 Bolenz & Schäfer Maschinenfabrik GmbH & Co KG, 3560 Biedenkopf Hydropneumatischer druckspeicher
JPS5973607U (ja) * 1982-11-10 1984-05-18 日立金属株式会社 圧力容器
DE3334813A1 (de) * 1983-09-26 1985-04-11 Brown, Boveri & Cie Ag, 6800 Mannheim Hochdruckspeicher
DE3411592C2 (de) * 1984-03-29 1994-06-30 Hydac Technology Gmbh Hydropneumatischer Speicher
US4799048A (en) * 1984-09-28 1989-01-17 Nippondenso Co., Ltd. Accumulator
JPH02186102A (ja) * 1989-01-10 1990-07-20 Nakamura Koki Kk ピストン型アキュムレータのピストン位置検知装置
US5233863A (en) * 1992-03-30 1993-08-10 Halliburton Company Fluid loss measuring system and method
JPH0636660U (ja) * 1992-10-22 1994-05-17 株式会社思動集団 ゴルフバッグ
JP4082370B2 (ja) * 2004-03-25 2008-04-30 株式会社島津製作所 液中秤量皿及び比重測定装置
US8020587B2 (en) * 2007-06-11 2011-09-20 The United States Of America As Represented By The Administrator Of The U.S. Environmental Protection Agency Piston-in sleeve hydraulic pressure accumulator
US9127661B2 (en) 2010-10-25 2015-09-08 Hamilton Sundstrand Corporation Bootstrap accumulator system with telescoping actuator cylinder
CN101956732B (zh) * 2010-11-04 2013-02-13 何学才 一种气、油缶组合非隔离多型活塞蓄能器
CN102192202B (zh) * 2011-06-21 2013-07-03 何学才 由焊接气缶和混合活塞蓄能器组成的蓄能器站
EP2924231A1 (en) * 2014-03-28 2015-09-30 Siemens Aktiengesellschaft Pressure compensation system
DE102015014797A1 (de) * 2015-11-14 2017-05-18 Hydac Technology Gmbh Sicherheitsvorrichtung

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1436987A (en) * 1920-10-08 1922-11-28 Kempter Fritz Control device for air accumulators
FR1510907A (fr) * 1966-11-10 1968-01-26 Sud Aviation Bâche hydraulique à soufflet de grande capacité
US3671695A (en) * 1970-04-24 1972-06-20 Gen Motors Corp Brake fluid level sensor
FR2236098B1 (ru) * 1973-07-04 1976-11-12 Gratzmuller Jean Louis
US3935410A (en) * 1974-09-03 1976-01-27 Howard Albert L Switch actuator with elongated lever
US3953845A (en) * 1975-02-04 1976-04-27 Lawrence Peska Associates, Inc. Oil level indicator
US4166936A (en) * 1978-02-01 1979-09-04 Delaval Turbine Inc. Viscosity-compensating flow switch

Also Published As

Publication number Publication date
DE2960110D1 (en) 1981-02-26
JPS5911761B2 (ja) 1984-03-17
AT376280B (de) 1984-10-25
BR7901156A (pt) 1979-10-09
SU953993A3 (ru) 1982-08-23
US4243856A (en) 1981-01-06
IN151113B (ru) 1983-02-26
FR2418356B1 (ru) 1980-10-31
HU182878B (en) 1984-03-28
JPS54123725A (en) 1979-09-26
CA1094921A (en) 1981-02-03
EP0003925A1 (fr) 1979-09-05
FR2418356A1 (fr) 1979-09-21
ATA142179A (de) 1984-03-15

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