WO2013155323A1 - Method to create vacuum insulated cabinets for refrigerators - Google Patents

Method to create vacuum insulated cabinets for refrigerators Download PDF

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Publication number
WO2013155323A1
WO2013155323A1 PCT/US2013/036203 US2013036203W WO2013155323A1 WO 2013155323 A1 WO2013155323 A1 WO 2013155323A1 US 2013036203 W US2013036203 W US 2013036203W WO 2013155323 A1 WO2013155323 A1 WO 2013155323A1
Authority
WO
WIPO (PCT)
Prior art keywords
forming tool
sheet
intermediate structure
annular space
forming
Prior art date
Application number
PCT/US2013/036203
Other languages
French (fr)
Inventor
Guolian Wu
Nihat Cur
Jurgen Pannock
Original Assignee
Whirlpool Corporation
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 Whirlpool Corporation filed Critical Whirlpool Corporation
Priority to EP13775196.2A priority Critical patent/EP2836349B1/en
Priority to IN7586DEN2014 priority patent/IN2014DN07586A/en
Publication of WO2013155323A1 publication Critical patent/WO2013155323A1/en

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
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/04—Combined thermoforming and prestretching, e.g. biaxial stretching
    • B29C51/06—Combined thermoforming and prestretching, e.g. biaxial stretching using pressure difference for prestretching
    • 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
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/02—Combined thermoforming and manufacture of the preform
    • 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
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/08—Deep drawing or matched-mould forming, i.e. using mechanical means only
    • B29C51/082—Deep drawing or matched-mould forming, i.e. using mechanical means only by shaping between complementary mould parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/38—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents with thermal insulation
    • B65D81/3802—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents with thermal insulation rigid container in the form of a barrel or vat
    • B65D81/3806—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents with thermal insulation rigid container in the form of a barrel or vat formed with double walls, i.e. hollow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D23/00—General constructional features
    • F25D23/06—Walls
    • F25D23/062—Walls defining a cabinet
    • F25D23/064—Walls defining a cabinet formed by moulding, e.g. moulding in situ
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D23/00—General constructional features
    • F25D23/06—Walls
    • F25D23/065—Details
    • 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
    • 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
    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
    • B29K2101/12—Thermoplastic materials
    • 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
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
    • 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
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0065—Permeability to gases
    • B29K2995/0067—Permeability to gases non-permeable
    • 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
    • B29L2031/762—Household appliances
    • B29L2031/7622—Refrigerators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2201/00—Insulation
    • F25D2201/10—Insulation with respect to heat
    • F25D2201/12—Insulation with respect to heat using an insulating packing material
    • F25D2201/126—Insulation with respect to heat using an insulating packing material of cellular type
    • F25D2201/1262—Insulation with respect to heat using an insulating packing material of cellular type with open cells
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2201/00—Insulation
    • F25D2201/10—Insulation with respect to heat
    • F25D2201/14—Insulation with respect to heat using subatmospheric pressure

Definitions

  • the present invention generally relates to a vacuum insulated cabinet and the method for constructing therefore.
  • Known plastic liner forming processes as shown in traditional refrigerator cabinet construction Figs. 1A - 1C, the plastic sheet does not have an impermeable layer to provide a sufficient barrier for a vacuum insulated cabinet.
  • a material sheet 12 having a single layer plastic is thermoformed over a first forming tool 11 to create a first intermediate structure 15.
  • a steel sheet wrapper 13 is then fitted over the first intermediate structure 15 to create an annular space 16.
  • the annular space 16 is filled with insulation material 14 by any conventional means.
  • the current insulation used in the refrigerator cabinet is polyurethane foam blown into the cavity between the plastic liner and the metal wrapper.
  • One aspect of the present invention includes a method of forming a vacuum insulated refrigerator cabinet providing first and second sheets of material comprising at least a first layer of thermal plastic material that is at least partially permeable to nitrogen and oxygen and the second layer of material that is substantially impermeable to oxygen, nitrogen and water vapor. At least a portion of the first sheet of material is heated to a temperature at which the first sheet of material can be plastically deformed.
  • a first forming tool is utilized to deform the first sheet of material and form a first intermediate structure having a base sidewall defining a generally quadrilateral perimeter and four first sidewalls extending transversely from the quadrilateral perimeter to define a cavity having an opening that opens in a first direction and defines a peripheral edge extending around the opening.
  • a second forming tool having sidewall portions defining four generally rectangular outwardly facing surfaces and four generally rectangular inwardly facing surfaces, and an end surface extending transversely between the inwardly and outwardly facing surfaces.
  • the first intermediate structure is disengaged from the first forming tool followed by positioning the second forming tool into the cavity of the first intermediate structure.
  • the base sidewalls are plastically deformed to form a second intermediate structure having a base sidewall and four inner sidewalls extending transversely from the base sidewall and defining a second cavity that opens in a second direction that is substantially opposite the first direction.
  • the inner sidewalls are spaced apart inwardly from the first sidewalls to define an annular space that opens in the first direction.
  • the second sheet of material is sealingly connected to the second intermediate structure around the peripheral edge to substantially close off the opening.
  • a vacuum is formed in the annular space with an appropriate porous, thermally insulating material such as fumed silica compacted and placed in the annular space to withstand atmospheric pressure and to provide superior thermal insulation properties.
  • Another aspect of the present invention includes a method of forming a vacuum insulated refrigerator cabinet providing first and second sheets of material comprising at least a first layer of thermoplastic material and a second layer of material. At least a portion of the first sheet of material is heated to a temperature at which the first sheet of material can be plastically deformed.
  • a first forming tool is utilized to deform the first sheet of material and form a first intermediate structure having the base sidewall defining a generally quadrilateral perimeter and at least one first side wall extending transversely from the quadrilateral perimeter to define a cavity having an opening that opens in a first direction and defines a peripheral edge extending around the opening.
  • a second forming tool having sidewall portions defining a plurality of generally rectangular outwardly facing surfaces and a plurality of generally rectangular inwardly facing surfaces, and an end surface extending transversely between the inwardly and outwardly facing surfaces.
  • the first intermediate part is disengaged from the first forming tool followed by positioning the second forming tool in the cavity of the first intermediate structure.
  • the base sidewall is plastically deformed to form a second intermediate structure having a base sidewall and a plurality of inner sidewalls extending transversely from the base sidewall and defining a second cavity that opens in a second direction that is substantially opposite the first direction.
  • the inner sidewalls are spaced apart inwardly from the first sidewalls to define an annular space that opens in the first direction.
  • the second sheet of material is sealingly connected to the second intermediate structure around the peripheral edge in order to substantially close off the opening.
  • a vacuum is formed in the annular space with an appropriate porous, thermally insulating material such as fumed silica compacted and placed in the annular space to withstand atmospheric pressure and to provide superior thermal insulation properties.
  • Yet another aspect of the present invention includes the method for forming a vacuum insulated refrigerator cabinet providing first and second sheets of material comprising at least a first layer of thermal plastic material that is at least partially permeable to oxygen, nitrogen and water vapor, and a second layer of material that is substantially impermeable to oxygen, nitrogen and water vapor. At least a portion of the first sheet of material is heated to a temperature at which the first sheet of material can be plastically deformed.
  • a first forming tool is utilized to deform the first sheet of material and form a first intermediate structure which defines a cavity having an opening that opens in a first direction and defines a peripheral edge extending around the opening.
  • a second forming tool is also provided.
  • the first intermediate part is disengaged from the first forming tool followed by positioning the second forming tool in the cavity of the first intermediate structure.
  • a base sidewall is plastically deformed in order to form a second intermediate structure having a base sidewall and a plurality of inner sidewalls extending transversely from the base sidewall and defining a second cavity that opens in the second direction substantially opposite the first direction.
  • the inner sidewalls are spaced apart inwardly from the first sidewalls to define an annular space that opens in the first direction.
  • the second sheet of material is sealingly connected to the intermediate structure around the peripheral edge in order to substantially close off the opening.
  • a vacuum is formed in the annular space with an appropriate porous, thermally insulating material such as fumed silica compacted and placed in the annular space to withstand atmospheric pressure and to provide superior thermal insulation properties.
  • FIG. 1A is a side plan view of a prior art version of a vacuum insulated cabinet
  • FIG. IB is a side plan view of a prior art version of a vacuum insulated
  • FIG. 1C is a side plan view of prior art version of a vacuum insulated
  • FIG. 2A is a side plan view of a method according to the present invention.
  • Fig. 2B is a side plan view of the method of the present invention.
  • Fig. 2C is a side plan view of the method of the present invention.
  • Fig. 2D is a side plan view of the method of the present invention.
  • Fig. 2E is a side plan view of the method of the present invention.
  • Fig. 2F is a side plan view of the method of the present invention.
  • FIG. 3A is a side plan view of another embodiment of the present invention.
  • Fig. 3B is a side plan view of the method of the present invention shown in Fig. 3;
  • Fig. 3C is a side plan view of the method of the present invention shown in Fig. 3;
  • Fig. 3D is a side plan view of the method of the present invention shown in Fig. 3.
  • Fig. 4 is a side plan view of yet another embodiment of the method of the
  • Figs. 2A - 2F show a method of forming a vacuum insulated cabinet 10 according to the present invention.
  • Fig. 2A shows a first forming tool 24 having a generally quadrilateral perimeter formed from a base wall 29 and a plurality of sidewalls 31 with two extending flanges 28 configured to extend from a bottom portion 25 of the quadrilateral perimeter.
  • the first forming tool 24 may further include at least one vacuum channel 26.
  • Fig. 2A also shows a first material sheet 20.
  • the first material sheet 20 is typically comprised of a first layer of thermoplastic material that is partially permeable to oxygen, nitrogen and water vapor and a second layer of material that is substantially impermeable to oxygen, nitrogen and water vapor.
  • a typical plastic composite used in this process is a first layer of high impact polystyrene (H IPS) food grade, specially tailored for refrigeration products and a second impermeable layer of EVOH.
  • H IPS high impact polystyrene
  • One exemplary embodiment uses Polystyrol 2710 by BASF and Edistr RR740E by Polimeri Europa as the first layer.
  • the first material sheet 20 is first softened typically using heat until the first material sheet 20 reaches a temperature at which the first material sheet 20 can be plastically deformed.
  • the first material sheet 20 is deformed into a semi-circle like shape typically formed by blowing air centrally on the first material sheet 20 while the first material sheet 20 has its edges clamped down to hold the edges in place, as shown in the dashed lines in Fig.
  • the first material sheet 20 is then lowered onto a top perimeter 27 of the first forming tool 24.
  • the edges of the first material sheet 20 are configured to be clamped onto the flanges 28 of the first forming tool 24.
  • the flanges 28 are typically comprised of the sidewalls 31 of the first forming tool 24.
  • a vacuum is then used to thermoform the first material sheet 20 over the first forming tool 24 to form the first intermediate structure 30 (shown in Fig. 2B).
  • the first intermediate structure 30 is aligned over a second forming mold 50.
  • the first intermediate structure 30 has a base sidewall 32 defining a generally quadrilateral perimeter 34 and a plurality of first sidewalls 36, typically four sidewalls, extending transversely from the quadrilateral perimeter 34 in order to define a cavity 38 which has an opening 40 that opens in a first direction and defines a peripheral edge 42 extending around the opening 40.
  • the opening 40 of the cavity 38 of the first intermediate structure 30 is aligned with a second forming tool 50.
  • the second forming tool 50 is typically comprised of sidewall portions 52 which define a plurality of generally rectangular outwardly facing surfaces 54 and a plurality of generally rectangular inwardly facing surfaces 56, and at least one end surface 58 extending transversely between the inwardly 56 and outwardly 54 facing surfaces.
  • the second forming tool 50 includes vacuum holes 53, to help form the first intermediate structure 30 onto the second forming tool 50 in order to produce the second intermediate structure 60.
  • the first intermediate structure 30 is heated to a temperature at which it can plastically deform.
  • the first intermediate structure 30 is then formed over the second forming mold 50 using vacuum holes 53 to help form the second intermediate structure 60.
  • a third forming tool 80 may be utilized.
  • the third forming tool 80 is configured to engage the second forming tool 50 in order to help form the second intermediate structure 60.
  • the third forming tool 80 is typically an opposite version of the second forming tool 50. For example, if the second forming tool 50 is a female mold, the third forming tool 80 is a corresponding male mold, and vice versa.
  • Fig. 2C shows the second intermediate structure 60.
  • the second intermediate structure 60 typically includes a base sidewall 62 and a plurality of inner sidewalls 64 extending transversely from the base sidewall 62 and defining a second cavity 66 that opens in a second direction that is substantially opposite the first direction.
  • the inner sidewalls 64 are spaced apart inwardly from the first sidewalls 62 to define an annular space 70 that opens in the first direction.
  • a second material sheet 22 is sealingly connected to the second intermediate structure 60.
  • the second material sheet 22 is extended across the peripheral edge of the second intermediate structure 60 in order to substantially close off the opening 68 of the second intermediate structure 60 and form an annular space 70.
  • the porous insulation material 90 is typically inserted and compacted to a density to withstand atmospheric pressure into the annular space 70 through at least one opening hole 92 typically located on the second material sheet 22. Additionally, the second material sheet 22 may have additional holes 94 in order to let air exit out of the annular space 70. Alternatively, the pre-formed and compacted insulation material 90 may be inserted into the annular space 70 of the second intermediate structure 60 prior to the sealing of the second material sheet 22. Once the insulation material 90 is inserted and the second material sheet 22 is sealingly connected to the second intermediate structure 60, a vacuum is used, typically in holes 92 and 94, in order to form a vacuum within the annular space 70 and sealed to produce a vacuum insulated cabinet 10. Moreover, as shown in Fig.
  • a sheet wrapper 100 may optionally be disposed over the vacuum insulated structure 10 in order to provide additional structural support.
  • the sheet wrapper 100 is typically comprised of steel and is generally quadrilateral in shape having an opening 102 on one side configured to receive the vacuum insulated cabinet 10.
  • Figs. 3A - 3D show an alternate embodiment of the present invention.
  • Fig. 3A shows a first forming tool 24 having a base sidewall 29 defining a generally quadrilateral perimeter and a plurality of sidewalls 31 extending transversely from the quadrilateral perimeter in order to define a cavity 33 having an opening 35 that opens in a second direction.
  • the first forming tool 24 may be a male or a female type mold structure.
  • the first material sheet 20 is plastically deformed through heating the first material sheet 20 which allows the first material sheet 20 to form a first intermediate structure 30 utilizing the first forming tool 24.
  • first intermediate structure 30 typically comprises a base sidewall 32 defining a generally quadrilateral perimeter 34 and a plurality of sidewalls 36 extending transversely from the quadrilateral perimeter 34 in order to define a cavity 38 having an opening 40 that opens in the second direction.
  • a second forming tool 50 is disposed inside of the cavity 38 of the first intermediate structure 30.
  • the second forming tool 50 typically has sidewall portions 52 defining a plurality of generally rectangular outwardly facing surfaces 54 and inwardly facing surfaces 56 and at least one end surface 58 extending transversely between the inwardly 56 and outwardly 54 facing surfaces.
  • the second forming tool 50 includes a cavity 57 defined by the at least one base sidewall 55 and plurality of inner sidewalls 64 extending transversely from the base wall 55 defining a second cavity 59 that opens in the first direction.
  • the second intermediate structure 60 typically has a base wall 62 and inner sidewalls 64 extending transversely from the base wall 62 defining a second cavity 68 that opens in the first direction and the inner sidewalls 64 are spaced apart inwardly from the first sidewall 62 in order to define an annular space 70.
  • the second forming tool 50 is comprised of pre-formed and compacted highly porous insulation material 90.
  • the insulation material 90 is configured to be solid enough to withstand atmospheric pressure when evacuated and to allow the first intermediate structure 30 to be formed over the insulation material 90 to produce the second intermediate structure 60.
  • the second forming tool 50 remains within the annular space 70, and is sealed inside by the second material sheet 22.
  • the second material sheet 22 is sealingly connected to the second intermediate structure 60 around an edge of the base sidewall 62 of the second intermediate structure 60. As shown in Fig. 3D, air can then be evacuated from the structures shown in Fig. 3C in order to produce a vacuum insulated cabinet 10.
  • the insulation material 90 may be inserted into the second intermediate structure prior to the covering of the structure 60 with the second material sheet 22.
  • the insulation material 90 may be inserted in such a way that forms a semicircle shape rising above the cavity 66 in the second intermediate structure.
  • the second material sheet 22 is configured to compact the insulation material 90 to a desired compaction level during the sealing process. The addition and compaction steps can be repeated as desired to reach the desired compaction level of the insulation material 90 to withstand atmospheric pressure when the annular cavity is which contains material 90 is evacuated.
  • the insulation material 90 is typically a highly porous granular insulation such as fumed silica or an open cell polyurethane foam or may be any other insulation material 90 known to one of ordinary skill in the art.
  • any ambient air is then evacuated from the annular space 70 forming a vacuum insulated cabinet 10.
  • the processes described above result in less thinning of the first 20 and second 22 material sheet in order to ensure that the first material sheet 20 and the second material sheet 22 remain intact in order to provide a vacuum insulated structure.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Refrigerator Housings (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Thermal Insulation (AREA)

Abstract

A method of forming a vacuum insulated refrigerator cabinet, the method comprising providing first and second sheets of material. The first sheet of material is thermoformed over a first forming tool forming a first intermediate structure. The first intermediate structure is then thermoformed over a second forming mold to create a second intermediate structure. The second sheet of material is then sealing connected with the second intermediate structure forming an annular space. A vacuum is created in the annular space creating a vacuum insulated cabinet.

Description

METHOD TO CREATE VACUUM INSULATED CABINETS FOR REFRIGERATORS
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] The present application claims priority to and the benefit of U.S. Provisional
Application Serial No. 61/622,821, filed April 11, 2012, entitled VACUU M INSULATED CABIN ETS FOR HOUSEHOLD REFRIGERATORS, and U.S. Utility Patent Application Serial No. 13/833,685, filed March 15, 2013, the entire disclosures of which are hereby incorporated by reference.
FIELD OF TH E INVENTION
[0002] The present invention generally relates to a vacuum insulated cabinet and the method for constructing therefore.
BACKGROU ND OF THE INVENTION
[0003] Known plastic liner forming processes, as shown in traditional refrigerator cabinet construction Figs. 1A - 1C, the plastic sheet does not have an impermeable layer to provide a sufficient barrier for a vacuum insulated cabinet. In current refrigerator cabinet versions an manufacturing an insulated refrigerator cabinet, as shown in Figs 1A- 1C, a material sheet 12 having a single layer plastic is thermoformed over a first forming tool 11 to create a first intermediate structure 15. A steel sheet wrapper 13 is then fitted over the first intermediate structure 15 to create an annular space 16. The annular space 16 is filled with insulation material 14 by any conventional means. The current insulation used in the refrigerator cabinet is polyurethane foam blown into the cavity between the plastic liner and the metal wrapper.
SUMMARY OF THE INVENTION
[0004] One aspect of the present invention includes a method of forming a vacuum insulated refrigerator cabinet providing first and second sheets of material comprising at least a first layer of thermal plastic material that is at least partially permeable to nitrogen and oxygen and the second layer of material that is substantially impermeable to oxygen, nitrogen and water vapor. At least a portion of the first sheet of material is heated to a temperature at which the first sheet of material can be plastically deformed. A first forming tool is utilized to deform the first sheet of material and form a first intermediate structure having a base sidewall defining a generally quadrilateral perimeter and four first sidewalls extending transversely from the quadrilateral perimeter to define a cavity having an opening that opens in a first direction and defines a peripheral edge extending around the opening. A second forming tool is provided having sidewall portions defining four generally rectangular outwardly facing surfaces and four generally rectangular inwardly facing surfaces, and an end surface extending transversely between the inwardly and outwardly facing surfaces. The first intermediate structure is disengaged from the first forming tool followed by positioning the second forming tool into the cavity of the first intermediate structure. The base sidewalls are plastically deformed to form a second intermediate structure having a base sidewall and four inner sidewalls extending transversely from the base sidewall and defining a second cavity that opens in a second direction that is substantially opposite the first direction. The inner sidewalls are spaced apart inwardly from the first sidewalls to define an annular space that opens in the first direction. The second sheet of material is sealingly connected to the second intermediate structure around the peripheral edge to substantially close off the opening. A vacuum is formed in the annular space with an appropriate porous, thermally insulating material such as fumed silica compacted and placed in the annular space to withstand atmospheric pressure and to provide superior thermal insulation properties.
Another aspect of the present invention includes a method of forming a vacuum insulated refrigerator cabinet providing first and second sheets of material comprising at least a first layer of thermoplastic material and a second layer of material. At least a portion of the first sheet of material is heated to a temperature at which the first sheet of material can be plastically deformed. A first forming tool is utilized to deform the first sheet of material and form a first intermediate structure having the base sidewall defining a generally quadrilateral perimeter and at least one first side wall extending transversely from the quadrilateral perimeter to define a cavity having an opening that opens in a first direction and defines a peripheral edge extending around the opening. A second forming tool is provided having sidewall portions defining a plurality of generally rectangular outwardly facing surfaces and a plurality of generally rectangular inwardly facing surfaces, and an end surface extending transversely between the inwardly and outwardly facing surfaces. The first intermediate part is disengaged from the first forming tool followed by positioning the second forming tool in the cavity of the first intermediate structure. The base sidewall is plastically deformed to form a second intermediate structure having a base sidewall and a plurality of inner sidewalls extending transversely from the base sidewall and defining a second cavity that opens in a second direction that is substantially opposite the first direction. The inner sidewalls are spaced apart inwardly from the first sidewalls to define an annular space that opens in the first direction. The second sheet of material is sealingly connected to the second intermediate structure around the peripheral edge in order to substantially close off the opening. A vacuum is formed in the annular space with an appropriate porous, thermally insulating material such as fumed silica compacted and placed in the annular space to withstand atmospheric pressure and to provide superior thermal insulation properties.
Yet another aspect of the present invention includes the method for forming a vacuum insulated refrigerator cabinet providing first and second sheets of material comprising at least a first layer of thermal plastic material that is at least partially permeable to oxygen, nitrogen and water vapor, and a second layer of material that is substantially impermeable to oxygen, nitrogen and water vapor. At least a portion of the first sheet of material is heated to a temperature at which the first sheet of material can be plastically deformed. A first forming tool is utilized to deform the first sheet of material and form a first intermediate structure which defines a cavity having an opening that opens in a first direction and defines a peripheral edge extending around the opening. A second forming tool is also provided. The first intermediate part is disengaged from the first forming tool followed by positioning the second forming tool in the cavity of the first intermediate structure. A base sidewall is plastically deformed in order to form a second intermediate structure having a base sidewall and a plurality of inner sidewalls extending transversely from the base sidewall and defining a second cavity that opens in the second direction substantially opposite the first direction. The inner sidewalls are spaced apart inwardly from the first sidewalls to define an annular space that opens in the first direction. The second sheet of material is sealingly connected to the intermediate structure around the peripheral edge in order to substantially close off the opening. A vacuum is formed in the annular space with an appropriate porous, thermally insulating material such as fumed silica compacted and placed in the annular space to withstand atmospheric pressure and to provide superior thermal insulation properties.
These and other features, advantages, and objects of the present invention will be further understood and appreciated by those skilled in the art by reference to the following specification, claims, and appended drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] Fig. 1A is a side plan view of a prior art version of a vacuum insulated cabinet;
[0009] Fig. IB is a side plan view of a prior art version of a vacuum insulated
cabinet;
[0010] Fig. 1C is a side plan view of prior art version of a vacuum insulated
refrigerator cabinet;
[0011] Fig. 2A is a side plan view of a method according to the present invention;
[0012] Fig. 2B is a side plan view of the method of the present invention;
[0013] Fig. 2C is a side plan view of the method of the present invention;
[0014] Fig. 2D is a side plan view of the method of the present invention;
[0015] Fig. 2E is a side plan view of the method of the present invention;
[0016] Fig. 2F is a side plan view of the method of the present invention;
[0017] Fig. 3A is a side plan view of another embodiment of the present invention;
[0018] Fig. 3B is a side plan view of the method of the present invention shown in Fig. 3;
[0019] Fig. 3C is a side plan view of the method of the present invention shown in Fig. 3;
[0020] Fig. 3D is a side plan view of the method of the present invention shown in Fig. 3; and
[0021] Fig. 4 is a side plan view of yet another embodiment of the method of the
present invention. DETAILED DESCRIPTION
[0022] Before the subject invention is described further, it is to be understood that the invention is not limited to the particular embodiments of the invention described below, as variations of the particular embodiments may be made and still fall within the scope of the appended claims. It is also to be understood that the terminology employed is for the purpose of describing particular embodiments, and is not intended to be limiting. Instead, the scope of the present invention will be established by the appended claims.
[0023] Where a range of values is provided, it is understood that each intervening value, to the tenth of the unit of the lower limit unless the context clearly dictates otherwise, between the upper and lower limit of that range, and any other stated or intervening value in that stated range, is encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included in the smaller ranges, and are also encompassed within the invention, subject to any specifically excluded limit in the stated range. Where the stated range includes one or both of the limits, ranges excluding either or both of those included limits are also included in the invention.
[0024] In this specification and the appended claims, the singular forms "a," "an" and
"the" include plural reference unless the context clearly dictates otherwise.
[0025] Figs. 2A - 2F show a method of forming a vacuum insulated cabinet 10 according to the present invention. Fig. 2A shows a first forming tool 24 having a generally quadrilateral perimeter formed from a base wall 29 and a plurality of sidewalls 31 with two extending flanges 28 configured to extend from a bottom portion 25 of the quadrilateral perimeter. The first forming tool 24 may further include at least one vacuum channel 26. Fig. 2A also shows a first material sheet 20. The first material sheet 20 is typically comprised of a first layer of thermoplastic material that is partially permeable to oxygen, nitrogen and water vapor and a second layer of material that is substantially impermeable to oxygen, nitrogen and water vapor. A typical plastic composite used in this process is a first layer of high impact polystyrene (H IPS) food grade, specially tailored for refrigeration products and a second impermeable layer of EVOH. One exemplary embodiment uses Polystyrol 2710 by BASF and Edistr RR740E by Polimeri Europa as the first layer. [0026] The first material sheet 20 is first softened typically using heat until the first material sheet 20 reaches a temperature at which the first material sheet 20 can be plastically deformed. Typically, the first material sheet 20 is deformed into a semi-circle like shape typically formed by blowing air centrally on the first material sheet 20 while the first material sheet 20 has its edges clamped down to hold the edges in place, as shown in the dashed lines in Fig. 2A. The first material sheet 20 is then lowered onto a top perimeter 27 of the first forming tool 24. The edges of the first material sheet 20 are configured to be clamped onto the flanges 28 of the first forming tool 24. The flanges 28 are typically comprised of the sidewalls 31 of the first forming tool 24. A vacuum is then used to thermoform the first material sheet 20 over the first forming tool 24 to form the first intermediate structure 30 (shown in Fig. 2B).
[0027] Next, as shown in Fig. 2B, the first intermediate structure 30 is aligned over a second forming mold 50. As also shown in Fig. 2B, the first intermediate structure 30 has a base sidewall 32 defining a generally quadrilateral perimeter 34 and a plurality of first sidewalls 36, typically four sidewalls, extending transversely from the quadrilateral perimeter 34 in order to define a cavity 38 which has an opening 40 that opens in a first direction and defines a peripheral edge 42 extending around the opening 40. The opening 40 of the cavity 38 of the first intermediate structure 30 is aligned with a second forming tool 50. The second forming tool 50 is typically comprised of sidewall portions 52 which define a plurality of generally rectangular outwardly facing surfaces 54 and a plurality of generally rectangular inwardly facing surfaces 56, and at least one end surface 58 extending transversely between the inwardly 56 and outwardly 54 facing surfaces. Again, the second forming tool 50 includes vacuum holes 53, to help form the first intermediate structure 30 onto the second forming tool 50 in order to produce the second intermediate structure 60.
[0028] As shown in Fig. 2B, the first intermediate structure 30 is heated to a temperature at which it can plastically deform. The first intermediate structure 30 is then formed over the second forming mold 50 using vacuum holes 53 to help form the second intermediate structure 60. Optionally, a third forming tool 80 may be utilized. The third forming tool 80 is configured to engage the second forming tool 50 in order to help form the second intermediate structure 60. The third forming tool 80 is typically an opposite version of the second forming tool 50. For example, if the second forming tool 50 is a female mold, the third forming tool 80 is a corresponding male mold, and vice versa.
[0029] Fig. 2C shows the second intermediate structure 60. The second intermediate structure 60 typically includes a base sidewall 62 and a plurality of inner sidewalls 64 extending transversely from the base sidewall 62 and defining a second cavity 66 that opens in a second direction that is substantially opposite the first direction. The inner sidewalls 64 are spaced apart inwardly from the first sidewalls 62 to define an annular space 70 that opens in the first direction. Next, a second material sheet 22 is sealingly connected to the second intermediate structure 60. The second material sheet 22 is extended across the peripheral edge of the second intermediate structure 60 in order to substantially close off the opening 68 of the second intermediate structure 60 and form an annular space 70. As shown in Fig. 2E, the porous insulation material 90 is typically inserted and compacted to a density to withstand atmospheric pressure into the annular space 70 through at least one opening hole 92 typically located on the second material sheet 22. Additionally, the second material sheet 22 may have additional holes 94 in order to let air exit out of the annular space 70. Alternatively, the pre-formed and compacted insulation material 90 may be inserted into the annular space 70 of the second intermediate structure 60 prior to the sealing of the second material sheet 22. Once the insulation material 90 is inserted and the second material sheet 22 is sealingly connected to the second intermediate structure 60, a vacuum is used, typically in holes 92 and 94, in order to form a vacuum within the annular space 70 and sealed to produce a vacuum insulated cabinet 10. Moreover, as shown in Fig. 2F, a sheet wrapper 100 may optionally be disposed over the vacuum insulated structure 10 in order to provide additional structural support. The sheet wrapper 100 is typically comprised of steel and is generally quadrilateral in shape having an opening 102 on one side configured to receive the vacuum insulated cabinet 10.
[0030] Figs. 3A - 3D show an alternate embodiment of the present invention. Fig. 3A shows a first forming tool 24 having a base sidewall 29 defining a generally quadrilateral perimeter and a plurality of sidewalls 31 extending transversely from the quadrilateral perimeter in order to define a cavity 33 having an opening 35 that opens in a second direction. As shown in Figs. 2A and 3A, the first forming tool 24 may be a male or a female type mold structure. The first material sheet 20 is plastically deformed through heating the first material sheet 20 which allows the first material sheet 20 to form a first intermediate structure 30 utilizing the first forming tool 24. Edges of the first material sheet 20 are clamped to the flanges 28 or transversely extending sidewalls 31 in order to form the first intermediate structure 30. Once the first intermediate structure 30 is formed, it typically comprises a base sidewall 32 defining a generally quadrilateral perimeter 34 and a plurality of sidewalls 36 extending transversely from the quadrilateral perimeter 34 in order to define a cavity 38 having an opening 40 that opens in the second direction.
Next, a second forming tool 50 is disposed inside of the cavity 38 of the first intermediate structure 30. The second forming tool 50 typically has sidewall portions 52 defining a plurality of generally rectangular outwardly facing surfaces 54 and inwardly facing surfaces 56 and at least one end surface 58 extending transversely between the inwardly 56 and outwardly 54 facing surfaces. Moreover, the second forming tool 50 includes a cavity 57 defined by the at least one base sidewall 55 and plurality of inner sidewalls 64 extending transversely from the base wall 55 defining a second cavity 59 that opens in the first direction. Once the second forming tool 50 is engaged with the first intermediate structure 30, the first intermediate structure 30 is plastically deformed using a vacuum system to produce a second intermediate structure 60. The second intermediate structure 60 typically has a base wall 62 and inner sidewalls 64 extending transversely from the base wall 62 defining a second cavity 68 that opens in the first direction and the inner sidewalls 64 are spaced apart inwardly from the first sidewall 62 in order to define an annular space 70. In the embodiment shown in Figs. 3A- 3D, the second forming tool 50 is comprised of pre-formed and compacted highly porous insulation material 90. The insulation material 90 is configured to be solid enough to withstand atmospheric pressure when evacuated and to allow the first intermediate structure 30 to be formed over the insulation material 90 to produce the second intermediate structure 60. In the embodiment shown in Fig. 3C, the second forming tool 50 remains within the annular space 70, and is sealed inside by the second material sheet 22. The second material sheet 22 is sealingly connected to the second intermediate structure 60 around an edge of the base sidewall 62 of the second intermediate structure 60. As shown in Fig. 3D, air can then be evacuated from the structures shown in Fig. 3C in order to produce a vacuum insulated cabinet 10.
As shown in Fig. 4, the insulation material 90 may be inserted into the second intermediate structure prior to the covering of the structure 60 with the second material sheet 22. The insulation material 90 may be inserted in such a way that forms a semicircle shape rising above the cavity 66 in the second intermediate structure. The second material sheet 22 is configured to compact the insulation material 90 to a desired compaction level during the sealing process. The addition and compaction steps can be repeated as desired to reach the desired compaction level of the insulation material 90 to withstand atmospheric pressure when the annular cavity is which contains material 90 is evacuated. The insulation material 90 is typically a highly porous granular insulation such as fumed silica or an open cell polyurethane foam or may be any other insulation material 90 known to one of ordinary skill in the art. Any ambient air is then evacuated from the annular space 70 forming a vacuum insulated cabinet 10. The processes described above result in less thinning of the first 20 and second 22 material sheet in order to ensure that the first material sheet 20 and the second material sheet 22 remain intact in order to provide a vacuum insulated structure.

Claims

CLAIMS The invention claimed is:
1. A method of forming a vacuum insulated refrigerator cabinet, the method comprising:
providing first and second sheets of material comprising at least a first layer of thermoplastic material that is at least partially permeable to oxygen, nitrogen and water vapor, and a second layer of material that is substantially impermeable to oxygen, nitrogen and water vapor;
heating at least a portion of the first sheet of material to a temperature at which the first sheet of material can be plastically deformed;
utilizing a first forming tool to deform the first sheet of material and form a first intermediate structure having a base sidewall defining a generally quadrilateral perimeter and four first sidewalls extending transversely from the quadrilateral perimeter to define a cavity having an opening that opens in a first direction and defines a peripheral edge extending around the opening;
providing a second forming tool having sidewall portions defining four generally rectangular outwardly facing surfaces and four generally rectangular inwardly facing surfaces, and an end surface extending transversely between the inwardly and outwardly facing surfaces;
disengaging the first intermediate part from the first forming tool, followed by positioning the second forming tool in the cavity of the first intermediate structure;
plastically deforming the base sidewall to form a second intermediate structure having a base sidewall and four inner sidewalls extending transversely from the base sidewall and defining a second cavity that opens in a second direction that is substantially opposite the first direction, wherein the inner sidewalls are spaced apart inwardly from the first sidewalls to define an annular space that opens in the first direction;
filling the annular space with a highly porous insulating material;
sealingly connecting the second sheet of material to the second intermediate structure around the peripheral edge to substantially close off the opening; and forming a vacuum in the annular space containing the insulation material.
2. The method of claim 1, wherein:
the second sheet of material is spaced apart from the base sidewall of the second intermediate structure to form a central space that is connected to the annular space.
3. The method of claim 1, wherein:
the second forming tool comprises the compacted porous insulation material; and at least a portion of the second forming is disposed in the annular cavity while a vacuum is formed in the annular space.
4. The method of claim 1, further comprising blowing air in the first direction on the first sheet of material to form a semi-circle shape.
5. The method of claim 1, further comprising clamping at least one edge of the first sheet of material to at least one flange of the first forming tool, wherein the at least one flange is comprised of at least one sidewall of the first forming tool.
6. The method of claim 1, wherein the first forming tool includes at least one vacuum channel.
7. The method of claim 6, wherein the first forming tool is a male mold.
8. The method of claim 6, wherein the first forming tool is a female mold.
9. A method of forming a vacuum insulated refrigerator cabinet, the method comprising:
providing first and second sheets of material comprising at least a first layer of thermoplastic material that is at least partially permeable to oxygen, nitrogen and water vapor, and a second layer of material that is substantially impermeable to oxygen, nitrogen and water vapor; heating at least a portion of the first sheet of material to a temperature at which the first sheet of material can be plastically deformed;
utilizing a first forming tool to deform the first sheet of material and form a first intermediate structure having a base sidewall and a plurality of first sidewalls extending transversely from the base sidewall to define a cavity having an opening that opens in a first direction and defines a peripheral edge extending around the opening;
providing a second forming tool having sidewall portions defining a plurality of generally rectangular outwardly facing surfaces and a plurality of generally rectangular inwardly facing surfaces, and at least one an end surface extending transversely between the inwardly and outwardly facing surfaces;
disengaging the first intermediate part from the first forming tool, followed by positioning the second forming tool in the cavity of the first intermediate structure; plastically deforming the base sidewall to form a second intermediate structure having a base sidewall and a plurality of inner sidewalls extending transversely from the base sidewall, wherein the plurality of inner sidewalls are spaced apart inwardly from the first sidewalls to define an annular space;
filling the annular space with a highly porous insulating material;
sealingly connecting the second sheet of material to the second intermediate structure around the peripheral edge to substantially close off the opening; and
forming a vacuum in the annular space containing the insulation material.
10. The method of claim 9, wherein:
the second sheet of material is spaced apart from the base sidewall of the second intermediate structure to form a central space that is connected to the annular space.
11. The method of claim 9, wherein:
the second forming tool comprises the highly porous insulating material; and at least a portion of the second forming is disposed in the annular cavity while a vacuum is formed in the annular space.
12. The method of claim 9, further comprising blowing air in the first direction on the first sheet of material to form a semi-circle shape.
13. The method of claim 9, further comprising clamping at least one edge of the first sheet of material to at least one flange of the first forming tool, wherein the at least one flange is comprised of at least one sidewall of the first forming tool.
14. The method of claim 9, wherein the first forming tool includes at least one vacuum channel.
15. The method of claim 14, wherein the first forming tool is a male mold.
16. The method of claim 14, wherein the first forming tool is a female mold.
17. A method of forming a vacuum insulated refrigerator cabinet, the method comprising:
providing first and second sheets of material comprising at least a first layer of thermoplastic material, and a second layer of material that is substantially impermeable to oxygen, nitrogen and water vapor;
heating at least a portion of the first sheet of material to a temperature at which the first sheet of material can be plastically deformed;
utilizing a first forming tool to deform the first sheet of material and form a first intermediate structure having a base sidewall and a plurality of first sidewalls extending transversely from the base sidewall to define a cavity having an opening and defines a peripheral edge extending around the opening;
providing a second forming tool having sidewall portions defining a plurality of outwardly facing surfaces and a plurality of inwardly facing surfaces, and at least one an end surface extending transversely between the inwardly and outwardly facing surfaces; disengaging the first intermediate part from the first forming tool, followed by positioning the second forming tool in the cavity of the first intermediate structure; plastically deforming the base sidewall to form a second intermediate structure having a base sidewall and a plurality of inner sidewalls extending transversely from the base sidewall, wherein the plurality of inner sidewalls are spaced apart inwardly from the first sidewalls to define an annular space;
sealingly connecting the second sheet of material to the second intermediate structure around the peripheral edge to substantially close off the opening;
filling the annular space with a highly porous insulating material; and
forming a vacuum in the annular space.
18. The method of claim 17, wherein the first forming tool includes at least one vacuum channel.
19. The method of claim 18, wherein the first forming tool is a male mold.
20. The method of claim 18, wherein the first forming tool is a female mold.
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US20180071972A1 (en) 2018-03-15
US9833942B2 (en) 2017-12-05

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