WO2007069880A2 - Inserting of metal fitting in hollow plastic container to seal liquid substances and gases - Google Patents

Inserting of metal fitting in hollow plastic container to seal liquid substances and gases Download PDF

Info

Publication number
WO2007069880A2
WO2007069880A2 PCT/MY2006/000020 MY2006000020W WO2007069880A2 WO 2007069880 A2 WO2007069880 A2 WO 2007069880A2 MY 2006000020 W MY2006000020 W MY 2006000020W WO 2007069880 A2 WO2007069880 A2 WO 2007069880A2
Authority
WO
WIPO (PCT)
Prior art keywords
liner
gases
metal fitting
plastic container
hollow plastic
Prior art date
Application number
PCT/MY2006/000020
Other languages
French (fr)
Inventor
Peter Beck
Original Assignee
Peter Beck
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 Peter Beck filed Critical Peter Beck
Publication of WO2007069880A2 publication Critical patent/WO2007069880A2/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
    • F17C1/16—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge constructed of plastics materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0104—Shape cylindrical
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/05—Size
    • F17C2201/056—Small (<1 m3)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0602—Wall structures; Special features thereof
    • F17C2203/0604—Liners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0658—Synthetics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/21—Shaping processes
    • F17C2209/2109—Moulding
    • F17C2209/2145—Moulding by rotation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/22—Assembling processes
    • F17C2209/228—Assembling processes by screws, bolts or rivets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/23—Manufacturing of particular parts or at special locations
    • F17C2209/232—Manufacturing of particular parts or at special locations of walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/035—Propane butane, e.g. LPG, GPL
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0107—Single phase
    • F17C2223/0123—Single phase gaseous, e.g. CNG, GNC
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/036—Very high pressure (>80 bar)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage

Definitions

  • This invention relates to seal (4) the plastic inner liner (5) for composite cylinders for low and high pressure applications. Specifically the installation of metal fitting (1) after manufacturing to prevent liquid and gas leaks and secure the looking nut (2) against self loosening.
  • LPG- and CNG Gas container have been manufactured in the past from metal, steel or aluminum since many decades without implementation of technical developments.
  • Today new materials, advanced technical standards, safety features and design changes allow replacement of existing gas cylinder design with composite materials.
  • Blow molding vessels in different shapes and weights with inserts are since many years the technical standard.
  • Inserts have to be pre-heated; interlocks for inserting the insert into the blow mold have to be installed into the machine program in order to avoid automatic mold closing while the maert is inserted by human or robots.
  • Blow molding with inserts is a very good technology but it increases the cycle time and makes the product much more expensive.
  • Fig. 1 shows the insert with the locking nut.
  • the present invention provides a method to manufacture blow molded liner (5) at high production speed and to place the fitting (1) into the liner
  • FIG. 2 is the view of the insert from Fig.l inserted into the liner.
  • the fitting (1) has at the inserted end approximately 5 mm more in diameter than rest of the insert and is min. 3 mm high at the position where the diameter is increased.
  • the fitting has a thread (3) which fits for LPG- or CNG valve connection and the outside thread (3) to fit for the locking nut (2).
  • the locking nut (2) cuts into the plastic neck of the liner (5) the entire locking mechanism becomes a liquid and gas tight seal and self loosening of the locking nut (2) is prevented by the plastic neck of the liner.
  • the component costs are reduced (only two components instead of four), the liner production hourly rate (pieces per hour) increases, hence final product costs are reduced and the safety of the product increases because of protection against self loosening of the nut.
  • the insert (1) has inside and outside threads (3) with one part whose diameter is approximately 3-5 mm wider than the cylindrical part.
  • the 3-5 mm lager diameter insure ⁇ the necessary sealing area (4) with the liner (5).
  • the sealing area (4) is the seal between insert (1) and the liner (5) in order to prevent leakage.
  • the insert (1) is fixed into the liners neck immediately after opening the mold where the temperature is still high and the plastic material flexible. Due to plastic shrinkage during cooling of the liner neck, the liner will shrink evenly around the insert (1) and establish a tight connection.
  • the nut (2) is screwed over the liner neck with a torque wrench and tightened. The plastic between nut and liner is the safety against self loosening of the nut.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Description

Inserting of metal fitting in hollow plastic container to seal liquid substances and gases
Technical field
This invention relates to seal (4) the plastic inner liner (5) for composite cylinders for low and high pressure applications. Specifically the installation of metal fitting (1) after manufacturing to prevent liquid and gas leaks and secure the looking nut (2) against self loosening.
Background
LPG- and CNG Gas container have been manufactured in the past from metal, steel or aluminum since many decades without implementation of technical developments. Today new materials, advanced technical standards, safety features and design changes allow replacement of existing gas cylinder design with composite materials. Blow molding vessels in different shapes and weights with inserts are since many years the technical standard. However, if the insert has to be placed into the blow mold before the parison is ejected from the accumulator head or in continuous extrusion, the blow molding cycle is always interrupted. Inserts have to be pre-heated; interlocks for inserting the insert into the blow mold have to be installed into the machine program in order to avoid automatic mold closing while the maert is inserted by human or robots. Blow molding with inserts is a very good technology but it increases the cycle time and makes the product much more expensive. The most common inserts used exist of: two injection molded plates with metal nut and inside thread, one part has to be inserted into blow mold before blow molding process and counter locked with other injection molded plate after de-flashing the neck of the liner. Amount of components used is four (two injection molded plates, two metal nuts). Disadvantage using this manufacturing process is if insert is not correctly placed in mold, the entire liner has to be rejected.
Placement of the fitting and sealing the liner is essential for the filament winding process later on. Disclosure of invention and summary
Fig. 1 shows the insert with the locking nut.
The present invention provides a method to manufacture blow molded liner (5) at high production speed and to place the fitting (1) into the liner
(5) directly after de-flashing and place the locking nut (2) with security against self loosening to ensure liquid and gas tight vessels. Fig. 2 is the view of the insert from Fig.l inserted into the liner. The fitting (1) has at the inserted end approximately 5 mm more in diameter than rest of the insert and is min. 3 mm high at the position where the diameter is increased. Internally the fitting has a thread (3) which fits for LPG- or CNG valve connection and the outside thread (3) to fit for the locking nut (2). When tightening the looking nut (2) into the liner, the inserted lower end of the fitting (1) presses against the liner inner (5) wall and creates annular sealing (4). Since the locking nut (2) cuts into the plastic neck of the liner (5) the entire locking mechanism becomes a liquid and gas tight seal and self loosening of the locking nut (2) is prevented by the plastic neck of the liner. With this invention the component costs are reduced (only two components instead of four), the liner production hourly rate (pieces per hour) increases, hence final product costs are reduced and the safety of the product increases because of protection against self loosening of the nut.
Function of invention and description of drawings
The insert (1) has inside and outside threads (3) with one part whose diameter is approximately 3-5 mm wider than the cylindrical part. The 3-5 mm lager diameter insureβ the necessary sealing area (4) with the liner (5).
The sealing area (4) is the seal between insert (1) and the liner (5) in order to prevent leakage.
The insert (1) is fixed into the liners neck immediately after opening the mold where the temperature is still high and the plastic material flexible. Due to plastic shrinkage during cooling of the liner neck, the liner will shrink evenly around the insert (1) and establish a tight connection. In the next step the nut (2) is screwed over the liner neck with a torque wrench and tightened. The plastic between nut and liner is the safety against self loosening of the nut.

Claims

Claim
This new invention where a metal / aluminum fitting is pressed into the liners neck and afterwards tightened with the looking nut where the plastic from the liner is in between, reduces two components, the manufacturing costs and the plastic from the liner neck is the safety against self loosening of the locking nut.
PCT/MY2006/000020 2005-12-12 2006-10-18 Inserting of metal fitting in hollow plastic container to seal liquid substances and gases WO2007069880A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
MYPI20055807 2005-12-12
MYPI20055807 2005-12-12

Publications (1)

Publication Number Publication Date
WO2007069880A2 true WO2007069880A2 (en) 2007-06-21

Family

ID=38163349

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/MY2006/000020 WO2007069880A2 (en) 2005-12-12 2006-10-18 Inserting of metal fitting in hollow plastic container to seal liquid substances and gases

Country Status (1)

Country Link
WO (1) WO2007069880A2 (en)

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