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
  • F15B1/22—Liquid port constructions
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
  • B29C49/04—Extrusion blow-moulding
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/20—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor of articles having inserts or reinforcements ; Handling of inserts or reinforcements
  • B29C2049/2008—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor of articles having inserts or reinforcements ; Handling of inserts or reinforcements inside the article
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/20—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor of articles having inserts or reinforcements ; Handling of inserts or reinforcements
  • B29C2049/2021—Inserts characterised by the material or type
  • B29C2049/2026—Neck portions
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
  • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
  • B29C70/86—Incorporated in coherent impregnated reinforcing layers, e.g. by winding
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2681/00—Use of polymers having sulfur, with or without nitrogen, oxygen or carbon only, in the main chain, for preformed parts, e.g. for inserts
  • B29K2681/04—Polysulfides, e.g. PPS, i.e. polyphenylene sulfide, or derivatives thereof
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
  • B29L2031/00—Other particular articles
  • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
  • B29L2031/3055—Cars
• • 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
• • 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
  • F15B2201/43—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
  • F15B2201/60—Assembling or methods for making accumulators
  • F15B2201/615—Assembling or methods for making ports therefor

Definitions

• Pressure accumulator comprising an insert
• the invention relates to vehicle pressure accumulators.
• Some types of hybrid vehicles include a hydraulic pump / motor system that can charge hydraulic accumulators with oil to store energy in the form of a pressure reserve.
• a hydraulic machine connected to the driving wheels of the vehicle can operate as a motor to deliver mechanical power to the wheels by taking the energy stored in the hydraulic accumulators, or as a pump to recharge these hydraulic accumulators during the braking of the vehicle, in order to recover at less in part the kinetic energy of the vehicle.
• a particular type of hydraulic accumulator is a bladder accumulator which generally comprises an enclosure within which is disposed a bladder containing gas, preferably nitrogen.
• gas preferably nitrogen.
• the bladder full of gas is compressed by the oil and, reciprocally, the bladder thus compressed tends to push the oil out of the enclosure by subjecting it to the increased pressure of the gas enclosed in the bladder.
• the oil is released from the enclosure and this oil, which transmits the pressure of the compressed gas into the bladder, supplies energy to a hydraulic motor.
• Type I accumulators Historically, several types of accumulators are known and distinguished according to the material of which they are made. The type I accumulators were totally metallic. Type II and III accumulators consist of fiber-coated metal, in part for Type II loudspeakers, entirely on Type III loudspeakers. Today, type IV enclosures include a plastic enclosure on which are wound filaments of composite materials embedded in a resin. This type of Type IV battery provides adequate strength while being lighter than type I, II, and III metal enclosures.
• metal inserts are placed on the enclosure, inserts whose function is to enable metal parts to be connected to the enclosure. or with the bladder, which are two non-metallic elements, while ensuring an optimal seal.
• Valve inserts for connecting conduits for bringing oil in and out of the enclosure, and valve inserts for connecting gas lines to the bladder.
• a valve insert includes several components, namely a valve body, support members and connecting elements such as nuts and rings, to prevent extrusion of the bladder.
• a valve insert also includes a plurality of components, namely generally a valve body that allows the bladder to remain closed once it is filled with gas, and the same type of connecting elements as a valve insert for securing the insert and the valve body on the enclosure.
• the inserts of these two types all include at least one component which is at least partially overmolded with thermoplastic material, such as HDPE, to facilitate its welding to the plastic enclosure, which enclosure has been previously formed by blowing a parison. After welding of this component on the enclosure, the other components of the insert are arranged relative to each other, then they are fixed by screwing. Sealing is achieved by interposing a seal between the portion of the insert molded HDPE and the enclosure. Once the insert is in place, composite fibers are wrapped around the enclosure, for example carbon fibers coated with epoxy resin. These fibers improve the strength of the enclosure at the same time as they hold the insert in place.
• thermoplastic material such as HDPE
• An object of the invention is to provide a sealing system which does not present a risk of leakage.
• Another object of the invention is to provide a simplified assembly of the insert within the enclosure.
• a vehicle pressure accumulator comprising an enclosure of thermoplastic material, a filament winding around the enclosure, a bladder and an insert, the insert consisting mainly of a first material and at least in part by a second material which is a thermoplastic material capable of being welded with the material constituting the enclosure, the insert being integral and shaped in such a way that it can not be separated after welding of the enclosure except by destruction of this last or the insert, and the insert further comprising means capable of sealing between the first material and the second material.
• Thermoplastic means any thermoplastic polymer, including thermoplastic elastomers, and mixtures thereof.
• the term "polymer” denotes both homopolymers and copolymers (especially binary or ternary). Examples of such copolymers are, but are not limited to: random copolymers, block copolymers, block copolymers and graft copolymers.
• thermoplastic polymer or copolymer whose melting point is below the decomposition temperature is suitable.
• Synthetic thermoplastics having a melting range spread over at least 10 degrees Celsius are particularly suitable. Examples of such materials are those having a polydispersion of their molecular weight.
• polystyrene resins it is possible to use polyolefins, thermoplastic polyesters, polyketones, polyamides and their copolymers.
• a mixture of polymers or copolymers may also be used, as well as a mixture of polymeric materials with inorganic, organic and / or natural fillers such as, for example, but not limited to: carbon, clays, salts and the like. inorganic derivatives, natural or polymeric fibers.
• multilayer structures consisting of stacked and solid layers comprising at least one of the polymers or copolymers described above.
• a polymer often used is polyethylene. Excellent results can be obtained with high density polyethylene (HDPE).
• HDPE high density polyethylene
• the wall of the enclosure may consist of a single layer of thermoplastic material or two layers.
• One or more other possible additional layers may advantageously consist of layers of liquid and / or gas barrier material.
• the nature and the thickness of the barrier layer are chosen so as to limit as much as possible the permeability of liquids and gases in contact with the inner surface of the enclosure.
• this layer may be based on a barrier resin, that is to say a resin impervious to fuel such as EVOH for example (ethylene copolymer - partially hydrolysed vinyl acetate).
• “Monoblock” means a piece that can not be divided into several parts, except to destroy it. We will also talk about a piece that can not be dismantled and whose only way to separate it into different elements is to destroy it.
• the insert being integral, it can be inserted and welded its overmolded portion during the blowing of the parison so as to facilitate and accelerate assembly of the assembly.
• the first material is metal
• the insert comprises at least one retention member of the bladder inside the enclosure.
• the retention member is a shutter capable of closing and opening a passageway between the inside and outside of the enclosure.
• the retention member is a grid.
• the orifices of the grid are large enough to let the fluid and small enough to prevent the bladder from leaving the enclosure.
• Any organ capable of performing these functions is similar to a grid in the sense of the invention.
• the insert comprises a circular groove between two shoulders, adapted to accommodate the enclosure.
• the insert is held in place on the groove and can not move relative to the enclosure, because of the shoulders.
• the means ensuring the sealing of the insert are an additive to the thermoplastic material of the insert allowing its adhesion with the enclosure
• the means ensuring the sealing of the insert may consist of a seal.
• the sealing system whether made by joint or by adhesion, no longer presents a risk of perforation.
• the seal is located in a circumferential groove housing.
• the retention member is movably mounted relative to the insert.
• the retention member may be a valve, a valve or any other element that moves to close or open the passageway.
• the subject of the invention is also a method for manufacturing a pressure accumulator as described above, in which:
• a bladder is fixed to an insert
• a parison is placed around the bladder in an open mold
• the parison is blown so as to form the enclosure
• FIG. 1 illustrates a longitudinal longitudinal sectional view of a battery of the prior art
• FIG. 2 illustrates a view in longitudinal section of an insert of the prior art
• - Figure 3 illustrates a longitudinal sectional view of an insert according to a first embodiment of the invention
• FIG. 4 illustrates a longitudinal sectional view of an insert according to a second embodiment of the invention
• FIG. 5 illustrates a longitudinal sectional view of a pressure accumulator having inserts according to the invention
• FIG. 6 illustrates a perspective view of an enclosure of a pressure accumulator
• FIG. 9 to 12 schematically illustrate steps of a method of manufacturing an assembly comprising an enclosure and according to the invention.
• FIG. 1 illustrates a pressure accumulator 1 for a vehicle according to the prior art, comprising an enclosure 2 made of high density polyethylene (HDPE) around which fibers 3 made of composite material are wound.
• the accumulator 1 comprises a bladder 4 located inside the chamber 2, a valve insert 5 to which a valve 6 is connected, and a valve insert 7 to which a valve 8 is connected. The latter is connected to the bladder 4.
• HDPE high density polyethylene
• a bladder comprises a variable volume organ.
• a bladder may comprise flexible walls so that it is able to inflate and deflate. It can change shape when compressed or otherwise tense, and can return to its original shape when it is no longer subject to any pressure. This is particularly the case with the bladder 4.
• the chamber 2 is tubular in shape with spherical ends. It has two orifices 11 and 12 respectively at each of its ends where the inserts 5 and 7 are located above.
• the method of using a bladder pressure accumulator in general and the type of the invention in particular is as follows.
• the valve Before normal operation of the vehicle comprising the accumulator, the valve is opened at the valve insert so as to introduce gas into the bladder. Once the bladder is filled with a predetermined amount of gas, the valve is closed.
• the valve serves only to prevent the bladder from coming out of the enclosure (this is called "extrusion" of the bladder).
• an element allows to open or close, in normal operation of the vehicle, the conduit for introducing oil into the chamber from a hydraulic circuit (not shown).
• the oil passageway is opened and, if the pressure exerted by the bladder filled with gas on the oil is greater than that exerted by the oil on the bladder. , then the oil is removed from the enclosure, to go into the hydraulic circuit that is connected to the vehicle's engine systems. The oil thus transmits the gas pressure of the chamber into the hydraulic circuit. The bladder regains a larger volume. This corresponds to the "destocking" of energy for its use in the engines.
• Figure 2 is an enlarged view of a valve insert 5 'of the prior art.
• the various elements of the insert 5 'and the valve are manually mounted in the chamber 2' already blown.
• the inner body 14 is inserted and positioned in the internal shoulder ring 17.
• the outer shoulder ring 17 ' is screwed onto the inner body 14 and then to the outer body 13. All these operations are carried out since outside the enclosure and claim a dexterity and patience not insignificant.
• FIG. 3 shows a valve insert 20 according to a first embodiment of the invention. It is monobloc. "Monoblock” means, in accordance with what has already been explained, a piece that is not removable, the only way to divide it into various elements is to destroy it.
• This insert 20 is located at an orifice 19 of the same type as that provided for the valve insert of the enclosure of FIG. 1. Its shape is symmetrical about an axis 100. It comprises a groove 21, on which is held in place the chamber 22 of the accumulator, at the orifice 19 thereof. At the bottom of this groove 21, is provided a circular housing (or small groove) 23 'about the axis 100, adapted to collect a seal 23. This seal 23 allows for sealing between the enclosure and the insert .
• the fiber winding 24 is located on the entire outer surface of the enclosure 22, particularly at the orifice 19. At this level, the fibers 24 make it possible to reinforce the holding in place of the insert 20 on the 22.
• the groove 23 of the insert is surrounded, in the direction of the axis 100, by two shoulders 25 and 26.
• the upper shoulder 25 of the insert is located outside the chamber 22, while that the lower shoulder 26, wider, is located inside the chamber 22.
• the surface of the insert 20 which goes from one shoulder to another through the groove of the seal 23, is overmolded HDPE, material identical to that constituting the enclosure.
• the portion of the lower shoulder 26 of the insert, overmolded with HDPE is welded to the enclosure 22 HDPE.
• any material capable of being welded with HDPE may be used to overmold the metal insert.
• the insert comprises a valve 27.
• the latter is mounted to move in translation along the axis 100 in the valve insert 20. It makes it possible to retain the bladder (not visible) when the volume of the latter increases, so that that it does not leave the enclosure 22.
• the insert 20 is connected to a passageway 28, which is shown but not detailed because it is not part of the invention. This passageway 28 makes it possible to circulate the oil between the enclosure 22 and a hydraulic circuit (not shown) outside the enclosure.
• FIG. 4 illustrates a second embodiment of the invention. This time this is a valve insert 30.
• This insert 30 also has a symmetrical shape about the axis 100, and is positioned at the end of the chamber opposite that of the valve insert 20
• the insert 30 has the same general characteristics regarding its shape as the valve insert 20, namely a groove 31 situated at the orifice 39 of the enclosure 22, and two shoulders 35 and 36, respectively external and 22.
• the same parts as the valve insert 20 are overmolded with HDPE and welded to the enclosure. In this figure, the valve is not visible.
• the insert 30 also comprises a seal 33 housed in the groove 31.
• Figure 5 shows the two previous inserts in a pressure accumulator 70 for vehicle. The bladder is not visible here.
• Figure 6 is an outside view of an enclosure 32 of the type used in pressure accumulators, where the fiber winding is distinguished over the entire outer surface of the enclosure.
• the insert whether it is a valve insert or a valve insert, does not have a seal for sealing.
• This type of insert is visible in FIG. 8. This schematic view is to be compared with that of FIG. 7, where an insert with a seal 43 is distinguished.
• the insert 50 of FIG. 8 comprises an additive in the over-molded part 57 made of HDPE of the insert 50, an adhesive additive such as a functionalized polymer ("grafted polymer”), in this case maleic anhydrous polyethylene, which makes it possible to glue the insert 50 and the enclosure 52 so that the seal between the insert 50 and the enclosure 22 is made by adhesion.
• an adhesive additive such as a functionalized polymer ("grafted polymer"), in this case maleic anhydrous polyethylene
• valve and valve inserts 20 according to the invention and an empty bladder 4 'are placed in the respective positions where these elements will be located. once the speaker is done. Thus, the bladder 4 'is attached to the valve insert 30, the valve insert 20 being located at the opposite end of the bladder 4', without contact therewith.
• the chamber of the accumulator is then made around this assembly.
• a parison 22 ' is extruded around the inserts 30 and 20 and the bladder 4' between two parts 61 and 62 of an open mold. Then the mold is closed by directing its two parts 61 and 62 towards each other. These close on the parison 22 ', pinch so that the parison 22' closes at the grooves 23 and 33 of each insert. Simultaneously, the parison 22 'is compression welded at the lower shoulders 26 and 36 overmolded with HDPE of each insert 20 and 30. Then, the parison 22' is blown by injecting air into the parison 22 '. by a known method and not illustrated here. The walls of the parison are then crushed against the walls of the two parts 61 and 62 of the mold, and thus take the form of the chamber 22 of the pressure accumulator.
• the two parts of the mold are moved apart so as to remove the enclosure comprising the two inserts 20 and 30 and the bladder 4 '.
• the material constituting the insert may comprise: steel, stainless steel, brass, aluminum. Other types of alloys are possible.
• the insert is not made of metal but of composite material.
• it may be composed of charged or reinforced material, of polysulphonic type thermoplastic such as polysulfide of phenylene (also referred to as "PPS").

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• General Engineering & Computer Science (AREA)
• Filling Or Discharging Of Gas Storage Vessels (AREA)
• Pressure Vessels And Lids Thereof (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=51790739

Family Applications (1)

Country Status (4)

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• 2014
  • 2014-09-04 FR FR1458254A patent/FR3025565B1/fr not_active Expired - Fee Related
• 2015
  • 2015-09-04 CN CN201580053875.0A patent/CN106795895A/zh active Pending
  • 2015-09-04 EP EP15767222.1A patent/EP3189238A1/de not_active Withdrawn
  • 2015-09-04 WO PCT/FR2015/052340 patent/WO2016034823A1/fr not_active Ceased

Non-Patent Citations (1)

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