EP0295176A1 - Pneumatisch gesteuertes Ventil und hydropneumatischer Druckspeicher mit einem derartigen Ventil - Google Patents

Pneumatisch gesteuertes Ventil und hydropneumatischer Druckspeicher mit einem derartigen Ventil Download PDF

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Publication number
EP0295176A1
EP0295176A1 EP88401367A EP88401367A EP0295176A1 EP 0295176 A1 EP0295176 A1 EP 0295176A1 EP 88401367 A EP88401367 A EP 88401367A EP 88401367 A EP88401367 A EP 88401367A EP 0295176 A1 EP0295176 A1 EP 0295176A1
Authority
EP
European Patent Office
Prior art keywords
valve
pipe
reservoir
accumulator
fluid
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.)
Withdrawn
Application number
EP88401367A
Other languages
English (en)
French (fr)
Inventor
Carlo Corbellini
Alain Gallon
Henri Masson
Philippe Richard
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.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Commissariat a lEnergie Atomique CEA filed Critical Commissariat a lEnergie Atomique CEA
Publication of EP0295176A1 publication Critical patent/EP0295176A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
    • B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
    • B67D7/00—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes
    • B67D7/02—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes for transferring liquids other than fuel or lubricants
    • B67D7/0238—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes for transferring liquids other than fuel or lubricants utilising compressed air or other gas acting directly or indirectly on liquids in storage containers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
    • B67C—CLEANING, FILLING WITH LIQUIDS OR SEMILIQUIDS, OR EMPTYING, OF BOTTLES, JARS, CANS, CASKS, BARRELS, OR SIMILAR CONTAINERS, NOT OTHERWISE PROVIDED FOR; FUNNELS
    • B67C3/00—Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus; Filling casks or barrels with liquids or semiliquids
    • B67C3/02—Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus
    • B67C3/06—Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus using counterpressure, i.e. filling while the container is under pressure
    • 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
    • F15B1/10—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means
    • F15B1/18—Anti-extrusion means
    • 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
    • F15B2201/315—Accumulator separating means having flexible separating means
    • F15B2201/3152—Accumulator separating means having flexible separating means the flexible separating means being bladders
    • 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
    • F15B2201/411—Liquid ports having valve means
    • 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
    • F15B2201/415—Gas ports
    • F15B2201/4155—Gas ports having valve means

Definitions

  • the present invention relates to a pneumatically operated valve. It also relates to a hydropneumatic accumulator equipped with this valve.
  • valves consists in obstructing a pipe conveying fluid in the event of a drop in its pressure. These valves are terminated by a rod and slide radially in the pipeline; a spring surrounds the rod and pushes the valve so as to obstruct it, which effectively takes place when the pressure of the fluid can no longer counteract the action of the spring.
  • the valve device in fact comprises a small reservoir whose capacity is divided into two parts by an elastic membrane; one is filled with gas, the other with fluid flowing in the pipeline.
  • the membrane tightens under the effect of the gas expansion and ends up reaching a valve and pushing it back until obstruction occurs.
  • German patent 36 09 534 which describes a device whose appearance resembles that of the invention, but which is not a valve but an accumulator intended to supply at low pressure the fluid of a reserve to a downstream pipe while preventing the return of the reserve fluid in the upstream pipe, as well as wear of a seat resulting from oscillations and shocks of a ball in the event of fluctuations in the supply pressure.
  • This accumulator therefore comprises a piston, a ball, a spring between the piston and the ball, a ball stop sleeve and a spring between the seat and the sleeve, which constitutes a more complicated design than the invention, but essential. to solve the problem.
  • An object of the invention is however to eliminate any flow of fluid at low pressure.
  • the valve according to the invention is particularly advantageous for hydropneumatic accumulators known as nitrogen overhead, the liquid content of which is pressurized by a gas supply pipe opening into the accumulator tank: the gas supply circuit can also be used for the valve reservoir without excessive complication; moreover, an emptying of the accumulator is sought as far as possible without however risking blowing gas into the pipeline, and it is therefore necessary to know with great precision the liquid pressure corresponding to the closing of the valve.
  • the invention firstly relates to a pneumatically controlled valve installed on a fluid pipe, comprising a reservoir, an elastic membrane contained in the reservoir and delimiting therein a first and a second variable volume, the first volume being filled with gas and the second volume communicating with the pipeline, a connection communicating the second volume with the fluid pipeline, characterized in that it comprises a piston sliding in the connection and capable of occupying, when the pressure in the pipe falls below a determined value, a closed position where it is in contact at one end with the membrane and discharged by it under the pressure of the gas filling the first volume and where it prevents the fluid from circulating in obstructing by an opposite end a fluid circulation orifice by resting on a seat established around the orifice.
  • the piston comprises a rod terminated by two opposite heads, the rod sliding in the connection, the diaphragm pushing back the piston by contact with one of the heads and the second head resting, in the closed position, on the seat established around the orifice for circulation of the fluid in the pipe.
  • the invention also relates to a hydropneumatic accumulator equipped with such a valve and further comprising a reservoir of larger dimensions than that of the valve, pierced with an orifice for introducing inert gas, the liquid circulating in the pipeline being contained in the bottom of the accumulator tank and pressurized by inert gas.
  • the valve assembly 1 firstly consists of a reservoir 2 pierced at one end of an orifice 3 allowing a pipe 4 for supplying gas from open into the reservoir 2.
  • the reservoir 2 is provided, opposite the orifice 3, with a connection 5 with a fluid pipe 6 comprising an upstream part 6a and that the valve must be able to obstruct.
  • the reservoir 2 is divided into two variable volumes Vg and Vf separated by an elastic deformable membrane 7.
  • the orifice 3 opens into the volume Vg while the connection 5 is crossed by another orifice 8 which opens both into the pipe 6 and in the other volume Vf.
  • the valve 1 also comprises a piston 9 composed of a rod 10 and two heads 11 and 12 at its two ends.
  • the piston 9 slides in the orifice 8 of the connection 5 using a frame 13 which is installed in the orifice 8 and which holds the rod 9 radially in place in rings 18 supported by spacers 19 linked to the connection 5. There is therefore a radial gap between the rod 9 and the connection 5, which allows the liquid contained in the pipe 6 to enter the volume Vf.
  • a first head 11 of the piston 9 performs a back-and-forth translation movement in the volume Vf, and the other head 12 performs a corresponding translation inside the pipe 6.
  • the translation of the piston 9 is however limited by a seat 14, established around an orifice in the pipe 6 upstream of the valve 1 and referenced 15, on which the second head 12 is capable of bearing in a so-called closed position, during which the head 12 completely obstructs the orifice 15 of the pipe 6 and therefore prevents the fluid present in this pipe from circulating.
  • a sealed support for the second head 12 can be provided by a projection 17 in a thin ring concentric with the orifice 15 and which makes contact with the seat 14.
  • the piston 9 can be provided with a return spring 16, taking for example support on the frame 13 and pressing the first head 11 which exerts on the piston 9 a push tending to move it away from the closed position.
  • the first head 11 comprises a convex convex surface 20 on the side of the membrane 7, and a cylindrical surface 21 notched with a groove for a seal 22. Its shape allows it to be able to be inserted into a recess 23 of the connection 5 which constitutes a transition between the orifice 8 and the volume Vf; this recess comprises a cylindrical surface 24 of diameter slightly greater than that of the cylindrical surface 21 of the first head 11, against which the seal 22 can rub.
  • the valve 1 is here inside a hydropneumatic accumulator 25 with nitrogen sky constituted by a second reservoir 26, of dimensions much larger than those of the reservoir 2 of the valve 1, and which is pierced with three orifices: an upper orifice 27 for introducing inert gas inside the tank 26, a lower orifice 28 through which the pipe 6 opens to the outside of the tank 26, and a third orifice 29 allowing the gas supply pipe 4 in the valve 1 to cross the reservoir 26.
  • the same gas can be chosen to fill the two tanks, for example nitrogen, and the gas supply pipes to the tank 2 of the valve 1 and the introduction of gas into the tank 26 of the accumulator 25 (the latter being referenced by 30) can be joined in a single pipe 31 outside the accumulator 25.
  • the three pipes 4, 30 and 31 are respectively provided with valves 32, 33 and 34 allowing the gas to flow in both directions.
  • the liquid line 6 is also provided with a valve referenced 35 outside the reservoir 26 of the accumulator 25 allowing the circulation of liquid in both directions or the obstruction of the line 6.
  • the accumulator 25 is shown approximately filled with liquid, up to a level 39, and this liquid is pressurized by blowing nitrogen in the lines 4 and 30 opening into the two tanks 2 and 26.
  • the membrane 7 takes a shape where it is partially detached from the wall of the tank 2 and is not in contact with the convex convex surface 20 of the first head 11 of the piston 9.
  • the spring 16 therefore repels the piston 9 towards the inside of the tank 2, here upwards, and the liquid filling the tank 26 of the accumulator 25 also fills the volume Vf.
  • the second head 12 of the piston 9 is detached from the seat 14, so that the pipe 6 is only blocked by the valve 35.
  • the pressure of the gas present in the reservoir 26 decreases, and reaches the pre-inflation pressure of the diaphragm 7 of the valve, the expansion of which is limited, so that a large downward force is exerted through the diaphragm. 7 on the first head 11 of the piston 9, sufficient to close the piston 9 and overcome the pressure of the fluid at the inlet of the orifice 15 and the force of the return spring 16.
  • the thin crown 17 of the second head 12 of the piston 9 comes into contact with the seat 14 and completely obstructs the orifice 15 of the pipe 6. The flow out of the accumulator 25 is stopped, and the nitrogen remains trapped there.
  • this accumulator 25 is possible and can take place - the valve 35 of the pipe 6 being open by first opening the valves 32 and 34 of the pipes 4 and 31 so as to allow the membrane 7 to deflate.
  • the piston 9 is then pushed upwards using the spring 16 and the residual pressure in the reservoir 26 of the accumulator 25.
  • the valve 33 of the pipe 30 is then opened so as to reduce the pressure in the reservoir 26 and to be able to fill it more conveniently with liquid using a pump disposed at the outlet of the pipe 6.
  • the membrane 7 can be inflated, close the valve 32, then pressurize the liquid in the reservoir 26 by injecting nitrogen through the pipe 30, and finally close the valves 33 and 34.
  • the valve 1 according to the invention can also be arranged in different ways with respect to the accumulator 25. It is for example possible to have it outside of it. This is what FIG. 4 represents. However, it works exactly as in the example given above and will therefore not be described in detail here. On the other hand, it should be noted that this construction makes it unnecessary to pierce the reservoir 26 of the accumulator 25 in order to pass the pipe 4 there, which here remains entirely exterior.
  • the valve 1 can be securely and simply held on the accumulator 25 if it is provided with a flange 40 screwable on a circular surface 41 established around an orifice 42 for the outlet of the liquid through the wall of the reservoir 26. This arrangement makes it possible to interpose, according to an advantageous characteristic, a safety valve 43 between the flange 40 and the bearing 41. It is then possible to dismantle the valve 1 and possibly to replace it without having to completely empty the accumulator 25.
  • the advantage of the seal 22 is to facilitate the filling of the accumulator 25 by the pipe 6.
  • the seal 22 rubs against the cylindrical surface 24 of the recess 23 and therefore prevents the liquid to immediately penetrate into the volume Vf, which would result in a pressure on the convex surface 20 opposing the detachment of the piston 9. It can then be envisaged to remove the return spring 16.
  • Another means of ensuring filling in a safe manner consists in carrying it out by a bypass line 44, provided with a valve 45 and opening out between the orifice 15 and the reservoir 26 of the accumulator 25.
  • the membrane 7 is an ovoid bladder at rest which, as shown in Figure 2, is similar in shape to the tank 2 and only slightly smaller dimensions.
  • the membrane 7 is fixed to the reservoir 2 near the connection 3 of the pipe 4. During its expansion, the membrane 7 undergoes only a slight radial and axial expansion so as to conform to the internal shape of the reservoir 2 and of the first head 11, but this expansion is limited, which means that the stresses suffered by the membrane 7 remain unimportant.
  • a similar advantage would be offered by a tank 2 in the form of a short cylinder occupied by a taut median circular membrane, the clearance of which would thus be limited to a small amplitude.
  • valve according to the invention compared to the valve of the prior art, which ensures the closing of the pipe in the event of depressurization using a calibrated spring, is first of all due to the perfectly known nature gas whose volume occupied can be determined as a function of pressure and temperature, while the behavior of a spring is difficult to know with precision, especially since it can vary over time in the event of corrosion and creep.
  • a second important advantage consists in that the triggering pressure of the valve 1 can be adjusted by varying the quantity of gas which fills the membrane 7.
  • valves can easily appear to those skilled in the art without departing from the scope of the invention.
  • use of such a valve is not limited to a hydropneumatic accumulator for which it nevertheless offers the additional advantage of being able to be supplied by the same gas circuit as the reservoir 26 of the accumulator. 25 and for which very high precision is desired, so as not to have to store too much liquid at the bottom of the reservoir 26 to avoid the risk of blowing gas into the pipe 6.
  • valve 1 can be used to interrupt the circulation of fluid in a hydraulic or pneumatic circuit as soon as the pressure of this fluid drops below a determined limit.
  • valve 1 plays the role of safety valve for a capacity, such as a tank 46.
  • the tank 46 is joined to the outside by the 'Intermediate of the pipe 6, with the interposition of the valve 1 according to the invention.
  • Two valves 47 and 48 placed on either side of the valve 1, respectively between the tank 46 and the valve, and between the valve and the part of the pipe 6 connected to the outside, make it possible to dismantle the valve, without loss of pressure in the tank 46, by means of two flanges 49 and 50 placed on a pipe 6, between the valve 1 and, respectively, the valves 47 and 48.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
EP88401367A 1987-06-10 1988-06-06 Pneumatisch gesteuertes Ventil und hydropneumatischer Druckspeicher mit einem derartigen Ventil Withdrawn EP0295176A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8708059A FR2616509B1 (fr) 1987-06-10 1987-06-10 Clapet a commande pneumatique et accumulateur hydropneumatique equipe de ce clapet
FR8708059 1987-06-10

Publications (1)

Publication Number Publication Date
EP0295176A1 true EP0295176A1 (de) 1988-12-14

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ID=9351878

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88401367A Withdrawn EP0295176A1 (de) 1987-06-10 1988-06-06 Pneumatisch gesteuertes Ventil und hydropneumatischer Druckspeicher mit einem derartigen Ventil

Country Status (2)

Country Link
EP (1) EP0295176A1 (de)
FR (1) FR2616509B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002530604A (ja) * 1998-11-25 2002-09-17 コンティネンタル・テーベス・アクチエンゲゼルシヤフト・ウント・コンパニー・オッフェネ・ハンデルスゲゼルシヤフト 圧力媒体アキュムレータ
WO2007124882A1 (de) * 2006-04-27 2007-11-08 Bosch Rexroth Ag Hydraulikfluidspeicher mit integrierter hochdruck- und niederdruckkammer
CN111550585A (zh) * 2019-05-31 2020-08-18 华中科技大学同济医学院附属协和医院 一种正压脉冲阀及其脉冲方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3609534C1 (en) * 1986-03-21 1987-04-09 Integral Hydraulik Co Hydraulic accumulator

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3609534C1 (en) * 1986-03-21 1987-04-09 Integral Hydraulik Co Hydraulic accumulator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002530604A (ja) * 1998-11-25 2002-09-17 コンティネンタル・テーベス・アクチエンゲゼルシヤフト・ウント・コンパニー・オッフェネ・ハンデルスゲゼルシヤフト 圧力媒体アキュムレータ
WO2007124882A1 (de) * 2006-04-27 2007-11-08 Bosch Rexroth Ag Hydraulikfluidspeicher mit integrierter hochdruck- und niederdruckkammer
CN111550585A (zh) * 2019-05-31 2020-08-18 华中科技大学同济医学院附属协和医院 一种正压脉冲阀及其脉冲方法

Also Published As

Publication number Publication date
FR2616509B1 (fr) 1989-09-22
FR2616509A1 (fr) 1988-12-16

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