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GB2419381A - Blow moulded bladder for hydraulic accumulator - Google Patents

Blow moulded bladder for hydraulic accumulator Download PDF

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Publication number
GB2419381A
GB2419381A GB0423137A GB0423137A GB2419381A GB 2419381 A GB2419381 A GB 2419381A GB 0423137 A GB0423137 A GB 0423137A GB 0423137 A GB0423137 A GB 0423137A GB 2419381 A GB2419381 A GB 2419381A
Authority
GB
United Kingdom
Prior art keywords
bladder
joining
insert
insert portion
polymeric material
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Withdrawn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
GB0423137A
Other versions
GB0423137D0 (en
Inventor
John Neave
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.)
SILVERTOWN U K Ltd
Original Assignee
SILVERTOWN U K Ltd
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 SILVERTOWN U K Ltd filed Critical SILVERTOWN U K Ltd
Priority to GB0423137A priority Critical patent/GB2419381A/en
Publication of GB0423137D0 publication Critical patent/GB0423137D0/en
Publication of GB2419381A publication Critical patent/GB2419381A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1635—Laser beams characterised by the way of heating the interface at least passing through one of the parts to be joined, i.e. laser transmission welding
    • 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
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1677—Laser beams making use of an absorber or impact modifier
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1677—Laser beams making use of an absorber or impact modifier
    • B29C65/168—Laser beams making use of an absorber or impact modifier placed at the interface
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1677—Laser beams making use of an absorber or impact modifier
    • B29C65/1683—Laser beams making use of an absorber or impact modifier coated on 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1226—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least one bevelled joint-segment
    • B29C66/12261—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least one bevelled joint-segment the two joint-segments being bevelled, e.g. the two joint-segments forming a V
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/124—Tongue and groove joints
    • B29C66/1244—Tongue and groove joints characterised by the male part, i.e. the part comprising the tongue
    • B29C66/12443—Tongue and groove joints characterised by the male part, i.e. the part comprising the tongue having the tongue substantially in the middle
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/124—Tongue and groove joints
    • B29C66/1246—Tongue and groove joints characterised by the female part, i.e. the part comprising the groove
    • B29C66/12461—Tongue and groove joints characterised by the female part, i.e. the part comprising the groove being rounded, i.e. U-shaped or C-shaped
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/124—Tongue and groove joints
    • B29C66/1248—Interpenetrating groove joints
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B29C66/542—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles joining hollow covers or hollow bottoms to open ends of container bodies
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • 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
    • F15B1/12—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means attached at their periphery
    • F15B1/125—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means attached at their periphery characterised by the attachment 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
    • 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
    • F15B1/16—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means in the form of a tube
    • F15B1/165—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means in the form of a tube in the form of a bladder
    • 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
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0822—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using IR radiation
    • 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
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/001—Shaping in several steps
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1603—Laser beams characterised by the type of electromagnetic radiation
    • B29C65/1612—Infrared [IR] radiation, e.g. by infrared lasers
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/483—Reactive adhesives, e.g. chemically curing adhesives
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/483—Reactive adhesives, e.g. chemically curing adhesives
    • B29C65/485—Multi-component adhesives, i.e. chemically curing as a result of the mixing of said multi-components
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
    • B29C66/7375—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined uncured, partially cured or fully cured
    • B29C66/73755—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined uncured, partially cured or fully cured the to-be-joined area of at least one of the parts to be joined being fully cured, i.e. fully cross-linked, fully vulcanized
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7394—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoset
    • 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
    • B29L2022/00—Hollow articles
    • B29L2022/02—Inflatable articles
    • B29L2022/025—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
    • F15B2201/20—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
    • 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
    • F15B2201/61—Assembling or methods for making separating means therefor

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electromagnetism (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Diaphragms And Bellows (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)

Abstract

A bladder 2 for a hydraulic accumulator is formed by blow moulding, and then an insert portion 20 including a valve 22 is joined to the bladder portion 10. The bladder portion 10 may be stretched over the insert portion 20 and retained by interlocking abutment features (see figure 2). The bladder and insert portions may also be adhesively bonded, or laser welded, possibly using an infra-red absorber.

Description

BLADDER
This invention relates to a bladder. In particular it relates to a bladder for use in a bladder accumulator.
Accumulators are used to store energy by compression of a gas and can be used to prevent damage to hydraulic equipment by reducing pressure pulse effects in the hydraulic system of the equipment. A bladder accumulator comprises a metal shell with a rubber bladder fitted inside the shell. The rubber bladder has a valve that allows the bladder to be pressurised by nitrogen gas from a gas source that is outside the shell.
The metal shell has a valve that connects the interior of the shell to the hydraulic system so that hydraulic fluid from the hydraulic system surrounds a portion of the bladder. If the hydraulic pressure increases the bladder is compressed by the hydraulic fluid and when the pressure drops, the bladder expands and forces hydraulic fluid from inside the shell back into the hydraulic system.
The cycle times for the compression and expansion of the bladder will vary depending on the application, for example, when the bladder accumulator is used with a moulding press the cycle time may be equivalent to the cycle time of the press opening and closing. The rubber bladder must be capable of withstanding the fatigue effects of cyclic loading caused by the collapse and recovery of the bladder. The bladder material must be suitable for use with hot hydraulic fluid and for most applications nitrite rubber is used, this rubber can withstand hydraulic fluid temperatures of about 120 C.
The bladders are typically made in two (or more) sections which are formed by compression or injection moulding. The moulding of the rubber sections typically takes about 20 minutes (for compression moulding). The most common types consist of a hemispherical cap section with a metallic valve moulded and bonded into the rubber, and a base section comprising a cylinder portion that is open one end and which is usually closed by a hemispherical portion at the other end. The two sections of the bladder are overlapped and adhesively joined. The joining process involves the following steps: i) trimming and buffing the joint areas ii) assembly of the base section onto a building tube iii) application of adhesive to the joint areas iv) overlapping the sections v) consolidation of the adhesive to the rubber vi) curing of the adhesive To cure the bladder, the bladder is placed inside a heated metal chamber of the same shape and size as the inflated bladder, the bladder is then pressurised with nitrogen to push the bladder out against the heated chamber. Care must be taken to cure the adhesive without any detrimental effect on the bladder caused by overcuring the already cured rubber sections. The adhesive must be chosen to have sufficient flexibility to allow the bladder to repeatedly flex at the operating temperature of hydraulic liquid used in the accumulator.
The assembly of the bladder from the two sections takes considerable skill, in particular the step of overlapping the sections. The assembly of the bladder sections can result in a high number of rejects particularly when the assembly is performed by a less experienced operator. The curing step generally takes longer than 15 minutes. In total it takes about man minutes to construct the bladder. The cost of the bladders is therefore driven by labour costs which are high compared to the costs of the materials used to make the bladder.
According to a first aspect of the invention there is provided a method of making an accumulator bladder comprising: blow-moulding a bladder portion; providing an insert portion including a valve; and joining the insert portion to the bladder portion.
An embodiment of the invention provides an accumulator comprising: a shell; the bladder of the first aspect of the invention housed within the shell; and a valve for connecting the interior of the shell to a hydraulic system.
According to a second aspect of the invention there is provided a bladder comprising: a blow-moulded bladder portion; and an insert portion including a valve; the insert portion being joined to the bladder portion.
Blow-moulding the bladder portion removes the need to make the bladder portion in two sections. In this way the time consuming steps of joining bladder portions is dispensed with. The construction of the bladder is easier and less skilled labour can be used to make the bladder compared
to that necessary to make the prior art bladders.
Generally, the bladder portion will be constructed from thermoplastic polymeric material.
Preferably the insert portion is joined to the bladder portion using laser welding. In this case the insert portion comprises a valve surrounded by a joining portion which is constructed of thermoplastic polymer and it is the joining portion that is welded to the bladder portion.
Alternatively, the insert potion is bonded to the bladder portion using an adhesive. In this case it is not necessary for the insert portion to have a joining portion and the insert portion may just comprise the valve which can be glued directly to the bladder portion. Since the valve is rigid and the part of the bladder portion that is connected to the valve does not generally flex in use then it is not necessary for the adhesive to be flexible when it is cured. A suitable adhesive would be an epoxy resin which can be cured at room temperature although other adhesives could be used.
Embodiments of the invention will now be described in more detail by way of example with reference to the accompanying drawings of which: Figure 1 is a cross-sectional view of a bladder according to a first embodiment of the invention; Figure 2a, 2b and 2c illustrate examples of joints that can used to interlock the bladder portion with the insert portion of the bladder of Figure 1; Figure 3 is a cross-sectional view of a bladder according to a second embodiment of the invention; and Figure 4 is a cross-sectional view of a bladder accumulator containing a bladder according to either the first or second embodiment of the invention.
Figure 1 illustrates a bladder 2 for use in a bladder accumulator comprising a bladder portion 10 that makes up the main part of the flexible wall of the bladder 2. The bladder portion 10 has a neck that defines an aperture 12 into which an insert portion 20 is fitted. The insert portion 20 comprises a valve 22 made of, for example, metallic material, and a joining portion 24 composed of a thermoplastic polymeric material that circumferentially surrounds one end of the valve 22. The joining portion 24 can be made by, for example, injection moulding.
The bladder portion 10 is made by blow-moulding a thermoplastic polymeric material. The diameter of the aperture 12 in the bladder portion is smaller than the outer diameter of the joining portion 24 and the bladder portion 10 has sufficient flexibility so that it can be stretched over the joining portion so that the joining portion 24 is in an interference fit with the bladder portion 10. The elasticity of the bladder portion 10 enables the neck of the bladder portion 10 to hold the joining portion 24 in place, that is, it grips the joining portion 24. The fitting together of the bladder portion 10 and the insert portion 20 is, therefore, a straightforward process.
Figure 2 shows various examples of how the bladder portion 10 and the joining portion 24 can interlock to produce a joint 28. Figure 2a shows the edge of the joining portion 24 having a protrusion of triangular cross- section 31 for interlocking with an edge of a bladder portion 20 that has a corresponding triangular recess 32. Alternatively, the recess 32 may be formed in the joining portion 24 and the protrusion 31 formed in the bladder portion 10. The protrusions and recesses may have a rectangular cross-section 33, 34, as shown in Figure 2b, or hemispherical cross- section 35, 36, as shown in Figure 2c. The skilled person may be able to conceive of other suitable joints.
Once the insert portion 20 and the bladder portion 10 have been fitted together an infra-red laser beam is applied to the material in the region of the joint 28 to weld together the joining portion 24 and the bladder portion 10. The infra-red beam is absorbed and causes the material in the region of the joint 28 to heat up and melt to produce the weld. The insert portion 20 is more rigid than the bladder portion 10 and can be held in a support mechanism to locate the insert portion 20 and the neck of the bladder portion 10 to allow laser welding of the two portions 20, 10 together. There is no need to support the bladder portion 10 since this is gripped by the interference fit with the joining portion 24.
To facilitate the welding process an infra-red absorber may be placed between the joining portion 24 and the bladder portion 10. For example, a thin sheet of the absorber may be inserted between the portions 24, 10 or the absorber may be sprayed or printed onto one or both of the surfaces to be welded. Alternatively, the infra-red absorber may be incorporated into the bladder portion 10 or the joining portion 24 by mixing the infra- red absorber with the thermoplastic polymer before the portion 10, 24 is moulded. In this case the infra-red absorber would generally be incorporated into the portion 10, 24 that is further from the laser beam, this is because if the portion closest to the laser beam has the added absorber then the majority of the incident laser beam may be absorbed before it can reach the interface of the two portions. Preferably, the joint 28 is configured so that the laser beam is incident on the bladder portion first and the infra-red absorber is added to the joining portion 24.
Less of the infra-red absorber would be required for such a configuration because the joining portion 24 is smaller than the bladder portion 10.
Carbon-black is commonly used as the infra-red absorber. Another infrared absorber that is commercially available is Clearweld_ (supplied by Gentex Corporation). Clearweld_ is a clear substance that was developed to create a joint that does not unduly change the appearance of the material being joined. Although Clearweld_ could be used the appearance of accumulator bladders is not important and carbon-black may be the cheaper choice for the infra-red absorber.
Generally the bladder portion 10 and the joining portion 24 will be made from a material that comprises substantially the same thermoplastic
-
polymeric material, however a different polymeric material may be used for the joining portion 24 than is used for the bladder portion 10.
Referring to Figure 3, a bladder 2 having a different construction to that shown in Figure 1 is illustrated. The bladder 2 comprises a bladder portion 10 that is blow-moulded from a thermoplastic polymeric material.
The bladder portion 10 is similar to that shown in Figure 2 except that the aperture 12 of the bladder portion 10 is smaller than that of the bladder portion 10 shown in Figure 1. An insert portion 20 is fitted into the neck of the bladder portion 10. The insert portion 20 does not need to be provided with a thermoplastic joining portion 24 (although this could be an option) and comprises a valve 22, the housing of which is generally metal and has a radially extending flange that locates in a recess in the neck of the bladder portion 10. Of course, the neck of the bladder portion 10 may have a flange to locate in a recess in the insert portion 20.
The neck 13 of the bladder portion 10 is shaped so it that interlocks with the insert portion 20 to form a joint 26. Before the insert portion 20 is fitted into the bladder portion 10, adhesive is applied to one or both of the surfaces that will form the joint 26.
The adhesive may be, for example, an epoxy resin although other adhesives may be suitable. The adhesive can be an adhesive that cures at room temperature such as, for example an epoxy resin such as Araldite 2015.
The material used for the bladder portion 10, for both types of bladder (i.e., as illustrated in Figure 1 and Figure 3) must be able to withstand hydraulic fluid, high temperatures (typically up to 120 C) and the fatigue caused by many cycles of compression and expansion of the bladder 2. To withstand a large number of deformation cycles the material needs to be soft enough so that the material does not crease after being deformed.
Generally the material should have an International Rubber Hardness Degree (IRHD) of less than 70 and preferably the IRHD should be less than 65. A suitable material for the bladder portion 10 is ETPV 60AO1 as supplied by DuPont_. This material consists of a cross-linked elastomer dispersed in a thermoplastic polymer matrix. ETPV 60A01 is resistant to hydraulic fluid, has the required softness (IRHD less than 70) and is able to handle high temperatures (at least 120 C).
Figure 4 shows a bladder accumulator 40 comprising a metal shell 42 and a bladder 2 fitted inside the shell 42. The bladder 2 may be the bladder 2 shown in Figure 1 or the bladder 2 shown in Figure 3. The valve 22 of the bladder 2 fits through an opening in the shell 22 and is held in place with a lock nut 44 to provide a seal between the valve 22 and the shell 32. The shell 32 is fitted with a pressure relief valve 43 for connecting the interior of the shell 32 with a hydraulic system. The pressure relief valve 43 opens if the hydraulic pressure in the hydraulic system exceeds a predetermined level to allow hydraulic fluid to flow into the accumulator 40. When the system pressure falls, the valve 43 remains open to allow the fluid to flow out of the accumulator until the bladder 2 expands sufficiently to close it if

Claims (32)

1. A method of making an accumulator bladder comprising: blow-moulding a bladder portion; providing an insert portion including a valve; and joining together the insert portion and the bladder portion.
2. The method of claim 1, wherein the bladder portion is substantially composed of thermoplastic polymeric material.
3. The method of claim 1 or claim 2, wherein the insert portion is more rigid than the bladder portion.
4. The method of any previous claim, wherein the bladder portion is stretched over the insert portion and exerts an inward force on the insert portion so that the insert portion is gripped by the bladder portion.
5. The method of any previous claim, wherein said joining comprises interlocking an abutment surface of the insert portion with an abutment surface of the bladder portion.
6. The method of any previous claim, wherein said joining comprises applying adhesive to an abutment surface of at least one of the insert portion and the bladder portion and butting the insert portion and the bladder portion together.
7. The method of any one of claims 1 to 5, wherein the insert portion has a joining portion for joining with the bladder portion, the joining portion comprising a thermoplastic polymeric material.
8. The method of claim 7 wherein the thermoplastic polymeric material of the joining portion is the same material as the thermoplastic polymeric material of the bladder portion.
9. The method of claim 7 or claim 8, wherein said joining comprises laser welding the joining portion of the insert portion to the bladder portion.
10. The method of claim 9, wherein one of the joining portion and the bladder portion contains an infra-red absorber to facilitate welding.
11. The method of claim 9, wherein an infra-red absorber is placed between the joining portion and the bladder portion.
12. The method of claim 10 or claim 11, wherein the infra-red absorber comprises carbon black.
13. The method of any one of claims 9 to 12, wherein the bladder is supported during welding by supporting the insert portion.
14. The method of any previous claim wherein the bladder portion is substantially composed of a cross-linked elastomer dispersed in a thermoplastic polymer matrix.
15. A bladder comprising: a blow-moulded bladder portion; and an insert portion including a valve; the insert portion being joined to the bladder portion.
16. The bladder of claim 15, wherein the bladder portion is substantially composed of thermoplastic polymeric material.
17. The bladder of claim 15 or claim 16, wherein the insert portion is more rigid than the bladder portion.
18. The bladder of claim 17, wherein the bladder portion is stretched over the insert portion and exerts an inward force on the insert portion so that the insert portion is gripped by the bladder portion.
19. The bladder of any one of claims 15 to 18, wherein an abutment surface of the insert portion and an abutment surface of the insert portion interlock.
20. The bladder of any one of claims 15 to 19, wherein the insert portion is joined to the bladder portion by a joint comprising adhesive between an abutment surface of the insert portion and an abutment surface of the bladder portion.
21. The bladder of any one of claims 15 to 19, wherein the insert portion has a joining portion for joining with the bladder portion, the joining portion comprising a thermoplastic polymeric material.
22. The bladder of claim 21 wherein the thermoplastic polymeric material of the joining portion is the same material as the thermoplastic polymeric material of the bladder portion.
23. The bladder of claim 21 or claim 22, wherein the insert portion is joined to the bladder portion by a laser weld between the joining portion and the bladder portion.
24. The bladder of claim 23, wherein one of the joining portion and the bladder portion contains an infra-red absorber to facilitate welding.
25. The bladder of claim 23, wherein an infra-red absorber is placed between the joining portion and the bladder portion.
26. The bladder of claim 24 or claim 25, wherein the infra-red absorber comprises carbon black.
27. The bladder of any one of claims 15 to 25 wherein the bladder portion is substantially composed of a cross-linked elastomer dispersed in a thermoplastic polymer matrix.
28. A bladder made by the method of any one of claims 1 to 14.
29. An accumulator comprising: a shell; the bladder of any one of claims 15 to 26 housed within the shell; and a valve for connecting the interior of the shell to a hydraulic system.
30. A method as hereinbefore described with reference to Figures 1 and 2, or Figure 3 or Figure 4.
31. A bladder as hereinbefore described with reference to Figures 1 and 2 or Figure 3 or Figure 4.
32. An accumulator as hereinbefore described with reference to Figure 4.
GB0423137A 2004-10-19 2004-10-19 Blow moulded bladder for hydraulic accumulator Withdrawn GB2419381A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0423137A GB2419381A (en) 2004-10-19 2004-10-19 Blow moulded bladder for hydraulic accumulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0423137A GB2419381A (en) 2004-10-19 2004-10-19 Blow moulded bladder for hydraulic accumulator

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GB0423137D0 GB0423137D0 (en) 2004-11-17
GB2419381A true GB2419381A (en) 2006-04-26

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Cited By (7)

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Publication number Priority date Publication date Assignee Title
DE102006004120A1 (en) * 2006-01-25 2007-07-26 Hydac Technology Gmbh Hydraulic accumulator, has coaxially abutting plastics casings, with poppet valve for controlling supply and extraction of medium
DE102006004121A1 (en) * 2006-01-25 2007-07-26 Hydac Technology Gmbh Pressure tank for holding a liquid/gaseous fluid medium has a second plastic jacket encasing a first plastic jacket both attached to each other in a coaxial structure
WO2014003641A1 (en) * 2012-06-27 2014-01-03 Ge Healthcare Bio-Sciences Ab Container with a seal and a method of making the seal
WO2015162355A1 (en) * 2014-04-23 2015-10-29 Inergy Automotive Systems Research (Société Anonyme) Method for manufacturing a pressure accumulator
WO2016034823A1 (en) * 2014-09-04 2016-03-10 Plastic Omnium Advanced Innovation And Research Pressure accumulator comprising an insert
WO2018168215A1 (en) * 2017-03-13 2018-09-20 日本発條株式会社 Accumulator
WO2023205407A1 (en) * 2022-04-22 2023-10-26 Amtrol Licensing Inc. Method and system for pressure relief in a multi chamber vessel

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GB1029315A (en) * 1963-05-17 1966-05-11 Olaer Patent Co Sealing means, more particularly for pressure vessels
GB1506423A (en) * 1974-03-22 1978-04-05 Mercier J Gas fitting for pressure vessels such as pressure accumulators
GB2083555A (en) * 1980-08-13 1982-03-24 Greer Hydraulics Inc Pressure vessel assemblies
GB2130139A (en) * 1982-10-22 1984-05-31 Olaer Ind Sa Elastomeric bladder and manufacture thereof
US4817830A (en) * 1986-10-31 1989-04-04 Ecodyne Corporation Pressure vessel with a bladder

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Publication number Priority date Publication date Assignee Title
US2721580A (en) * 1950-11-06 1955-10-25 Greer Hydraulics Inc Bladder type pressure accumulator
GB1029315A (en) * 1963-05-17 1966-05-11 Olaer Patent Co Sealing means, more particularly for pressure vessels
GB1506423A (en) * 1974-03-22 1978-04-05 Mercier J Gas fitting for pressure vessels such as pressure accumulators
GB2083555A (en) * 1980-08-13 1982-03-24 Greer Hydraulics Inc Pressure vessel assemblies
GB2130139A (en) * 1982-10-22 1984-05-31 Olaer Ind Sa Elastomeric bladder and manufacture thereof
US4817830A (en) * 1986-10-31 1989-04-04 Ecodyne Corporation Pressure vessel with a bladder

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006004121A1 (en) * 2006-01-25 2007-07-26 Hydac Technology Gmbh Pressure tank for holding a liquid/gaseous fluid medium has a second plastic jacket encasing a first plastic jacket both attached to each other in a coaxial structure
US7637285B2 (en) 2006-01-25 2009-12-29 Hydac Technology Gmbh Hydraulic accumulator
US7959027B2 (en) 2006-01-25 2011-06-14 Hydac Technology Gmbh Pressurized container
DE102006004120A1 (en) * 2006-01-25 2007-07-26 Hydac Technology Gmbh Hydraulic accumulator, has coaxially abutting plastics casings, with poppet valve for controlling supply and extraction of medium
WO2014003641A1 (en) * 2012-06-27 2014-01-03 Ge Healthcare Bio-Sciences Ab Container with a seal and a method of making the seal
US9550609B2 (en) 2012-06-27 2017-01-24 Ge Healthcare Bio-Sciences Ab Container with a seal and a method of making the seal
CN106232321A (en) * 2014-04-23 2016-12-14 全耐塑料高级创新研究公司 accumulator manufacturing method
WO2015162355A1 (en) * 2014-04-23 2015-10-29 Inergy Automotive Systems Research (Société Anonyme) Method for manufacturing a pressure accumulator
FR3020306A1 (en) * 2014-04-23 2015-10-30 Inergy Automotive Systems Res METHOD FOR MANUFACTURING A PRESSURE ACCUMULATOR
FR3025565A1 (en) * 2014-09-04 2016-03-11 Inergy Automotive Systems Res MONOBLOC INSERT OVERMOLDED WITH A SEALING SYSTEM
WO2016034823A1 (en) * 2014-09-04 2016-03-10 Plastic Omnium Advanced Innovation And Research Pressure accumulator comprising an insert
CN106795895A (en) * 2014-09-04 2017-05-31 全耐塑料高级创新研究公司 Pressure accumulator comprising an insert
WO2018168215A1 (en) * 2017-03-13 2018-09-20 日本発條株式会社 Accumulator
JP2018151002A (en) * 2017-03-13 2018-09-27 日本発條株式会社 accumulator
US11174880B2 (en) 2017-03-13 2021-11-16 Nhk Spring Co., Ltd. Accumulator
WO2023205407A1 (en) * 2022-04-22 2023-10-26 Amtrol Licensing Inc. Method and system for pressure relief in a multi chamber vessel
US11953154B2 (en) 2022-04-22 2024-04-09 Amtrol Licensing Inc. Method and system for pressure relief in a multi chamber vessel

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