Vacuum insulated refrigerator structure with three dimensional characteristics

Information

  • Patent Grant
  • 11609037
  • Patent Number
    11,609,037
  • Date Filed
    Friday, April 16, 2021
    3 years ago
  • Date Issued
    Tuesday, March 21, 2023
    a year ago
Abstract
A method of making a vacuum insulated refrigerator structure includes positioning a core of overlapping stacked sheets of fiberglass mat in an envelope of impermeable barrier material. The core is pressed into a predefined three dimensional shape by pressing first and second mold parts together. The core is evacuated, and the envelope is sealed to form a three dimensional core having an airtight envelope around the core. The three dimensional vacuum core is positioned between a wrapper and a liner, and the wrapper and the liner are interconnected to form a vacuum insulated refrigerator structure.
Description
BACKGROUND

Various types of vacuum insulated refrigerator structures have been developed. Known vacuum insulated structures may include a core panel that is positioned between a wrapper and a liner. The core panel may comprise a simple rectangle of uniform thickness with flat inner and outer surfaces, and flat edge surfaces that extend transversely between the inner and outer surfaces. However, the flat two dimensional (“2D”) shapes of these core panels may limit the applications of these types of panels.


SUMMARY

One aspect of the present disclosure is a method of making a vacuum insulated refrigerator structure. The method includes positioning a core comprising a plurality of overlapping stacked sheets of a flexible core material over a first mold part of a mold tool with a first sheet of impermeable barrier material positioned between a first side of the sheets of the core material and the first mold part. The sheets of flexible core material may comprise woven or non-woven fiberglass mat or other suitable material. The method includes positioning a second sheet of impermeable barrier material over a second side of the core material that is opposite the first side. The core is formed into a predefined three dimensional shape by pressing a second mold part of the mold tool into contact with the second sheet of impermeable barrier material. The core is evacuated, and edge portions of the first and second sheets are sealed together while the core is evacuated to form a three dimensional core having an airtight envelope around the core. The three dimensional vacuum core is removed from the mold tool, and the three dimensional vacuum core is positioned between a wrapper and a liner. The wrapper and the liner are interconnected to form a vacuum insulated refrigerator structure. The vacuum insulated structure may comprise an outer panel of a refrigerator door, a refrigerator cabinet or portion thereof, or other refrigerator structure.


Another aspect of the present disclosure is a method of making a vacuum insulated refrigerator door having an inner side and an outer side. The method includes cutting a first plurality of sheets of fiberglass mat to form rings having generally rectangular outer peripheral edges forming enlarged central openings through the first plurality of sheets. The method includes providing a second plurality of sheets of fiberglass mat having generally rectangular peripheral edges and continuous central portions that do not have openings therethrough. The first and second plurality of sheets are stacked to form a stacked assembly having a generally rectangular frame portion and an outer panel portion that together form a generally rectangular cavity. The method includes forming an envelope of impermeable material around the stacked assembly, and a vacuum is formed inside the envelope. The envelope is sealed to form a three dimensional (“3D”) vacuum core. The three dimensional vacuum core is positioned between a wrapper and a liner, and the wrapper and the liner are interconnected to form a vacuum insulated refrigerator structure.


Another aspect of the present disclosure is a vacuum insulated refrigerator structure. The vacuum insulated refrigerator structure may comprise a door front panel or other refrigerator cabinet structure. The refrigerator structure includes a polymer lining having a first peripheral portion and a wrapper having a second peripheral portion that is connected to the first peripheral portion to define a cavity. A 3D vacuum core is disposed in the cavity. The 3D vacuum core includes a plurality of stacked mats disposed inside an impermeable envelope that is sealed to prevent entry of gas. A first plurality of the stacked mats have enlarged central openings therethrough to form a frame portion. A second plurality of the stacked mats do not have enlarged central openings therethrough and form an outer panel portion. The frame portion and the outer panel portion together define a U-shape in cross section.


These and other features, advantages, and objects of the present device will be further understood and appreciated by those skilled in the art upon studying the following specification, claims, and appended drawings.





BRIEF DESCRIPTION OF THE DRAWINGS

In the drawings:



FIG. 1 is an isometric view of a refrigerator;



FIG. 2 is an isometric view of a vacuum insulated refrigerator structure;



FIG. 3 is a cross sectional view of the vacuum insulated refrigerator structure of FIG. 2;



FIG. 4 is a top plan view of a fiberglass mat;



FIG. 5 is an exploded side elevational view of plurality of fiberglass mats;



FIG. 6 is a top plan view of a fiberglass mat;



FIG. 7 is an exploded side elevational view of a stack of fiberglass mats;



FIG. 8 is a cross sectional view showing a vacuum insulated core structure in a mold tool;



FIG. 9 is a cross sectional view showing a vacuum core, wrapper, and liner in a mold tool;



FIG. 10 is an exploded cross sectional view of a vacuum core in a mold tool;



FIG. 11 is an isometric view of a fiberglass mat;



FIG. 12 is a top plan view of a plurality of sheets of fiberglass mat;



FIG. 13 is an exploded side elevational view of a plurality of fiberglass mats; and



FIG. 14 is a flowchart showing a method of making a vacuum insulated refrigerator structure.





DETAILED DESCRIPTION OF EMBODIMENTS

For purposes of description herein the terms “upper,” “lower,” “right,” “left,” “rear,” “front,” “vertical,” “horizontal,” and derivatives thereof shall relate to the device as oriented in FIG. 1. However, it is to be understood that the device may assume various alternative orientations and step sequences, except where expressly specified to the contrary. It is also to be understood that the specific devices and processes illustrated in the attached drawings, and described in the following specification are simply exemplary embodiments of the inventive concepts defined in the appended claims. Hence, specific dimensions and other physical characteristics relating to the embodiments disclosed herein are not to be considered as limiting, unless the claims expressly state otherwise.


With reference to FIG. 1, a refrigerator 1 includes a cabinet 2 and upper doors 4A and 4B that are rotatably mounted to the cabinet 2 for movement between open and closed positions. Doors 4A and 4B provide access to a refrigerator compartment 12 that is formed in part by an inner liner 6. A lower freezer door 4C provides access to a freezer compartment 9 that is defined in part by a lower liner 8. The lower freezer door 4C may comprise a drawer that slides linearly as designated by the arrow “A.” Alternatively, freezer door 4C may be rotatably mounted to the cabinet 2 for rotational movement “B” that is similar to that of doors 4A and 4B. Refrigerator 1 includes a space 10 for housing a refrigeration system (not shown) outside of refrigerator compartment 12 and freezer compartment 9. The refrigeration system may comprise a conventional refrigeration system of a known type including a compressor, evaporator, condenser, and other components. Alternatively, the refrigeration system may comprise a thermoelectric system or other known cooling system.


With reference to FIGS. 2 and 3, a vacuum insulated structure such as front panel 20 of lower door 4C may include a wrapper 22 and a liner 26. Upper doors 4A and 4B and/or cabinet 2 may also be constructed in the same manner as front panel 20. Wrapper 22 may comprise sheet metal that is formed utilizing known metal-forming processes, and liner 26 may comprise a polymer material that is vacuum formed utilizing known processes. However, wrapper 22 and/or liner 26 may comprise other materials formed by other processes. Wrapper 22 includes a flange or edge portion 24 that is interconnected with a flange or edge portion 28 of liner 26 in a known manner utilizing adhesives, fasteners, etc. In the illustrated example, the edge portions 24 and 28 overlap, and liner 26 forms a groove or channel 30 that receives a resilient gasket 32 to seal the panel 20 to a front surface 34 (FIG. 1) of cabinet 2 in a known manner. Resilient gasket 32 may be in the form of a ring, and may include an elongated magnet that forms a seal with cabinet 2.


With reference to FIG. 3, the wrapper 22 and liner 26 together define an internal cavity 36. A three dimensional (“3D”) vacuum core 38 is disposed in the cavity 36. As discussed in more detail below, the 3D vacuum core 38 comprises a plurality of sheets 40 of fiberglass mat (woven or non-woven) or other suitable material that are stacked together to form a frame portion 42, and a front panel portion 44. Sheets 40 may comprise virtually any suitable material. In general, sheets of flexible porous material are preferred. When fully assembled, frame portion 42 and panel portion 44 form a unitary structure. However, the mats 40B (FIG. 6) utilized to form frame portion 42 are cut to have different shapes than the mats 40A (FIG. 4) utilized to form panel portion 44. The frame portion 42 and front panel portion 44 together define a cavity 46 that is generally rectangular or bathtub-shaped with an opening 47. Also, as shown in FIG. 3, the frame portion 42 and front panel portion 44 together have a cross sectional shape that is generally U-shaped. Wrapper 22 may have a front surface 23 that is flat, or the front surface 23 may be slightly convex as shown in FIG. 2. In the illustrated example, surface 23 is cylindrical with a radius of approximately 10-20 feet. As also discussed below, the sheets 40 are disposed inside an impermeable envelope 48 that is sealed to prevent entry of gas inside the envelope 48 such that the sheets 40 are disposed in a vacuum.


With reference to FIGS. 4 and 5, a plurality of sheets 40A having a generally rectangular perimeter 52 with generally linear edge portions 52A-52D may be cut from fiberglass mat or other suitable core material (see also step 201; FIG. 14). The rectangular sheets 40A may be stacked to form a rectangular stack 50 having four side surfaces 54A-54D corresponding to edges 52A-52D, respectively, and generally planar inner and outer sides 58. When assembled, outer side 58 faces towards wrapper 22, and inner side 56 faces towards liner 26. The sheets 40A may all have the same size and shape, and may include a central portion 53 that is substantially continuous. When stacked, the sheets 40A form a rectangular stack 50 with sides 54A-54B that are orthogonal to the inner and outer sides 56 and 58, respectively. Sheets 40A may optionally be positioned on a curved mold surface to form cylindrical upper and lower surfaces 56 and 58 that correspond to curved outer surface 23 of vacuum panel 20. As discussed in more detail below, the sheets 40 may have different sizes and/or shapes to provide side surfaces that are tapered, curved, or the like. The rectangular stack of sheets 50 may be utilized to form the front panel portion 44 (FIG. 3) of vacuum panel 20.


With further reference to FIGS. 6 and 7, a plurality of sheets 40B of fiberglass mat or other material may cut to include a rectangular outer perimeter 60 including four linear portions 60A-60C (see also step 202; FIG. 14). The sheets 40B may also be cut to include an inner perimeter 62 having four linear portions 62A-62D forming a rectangular central opening 64. The individual sheets 40B can be stacked to form a frame stack portion 66 corresponding to the frame portion 42 (FIG. 3) of vacuum panel 20. Linear portions 62A-62D of central openings 64 of sheets 40B form sidewalls 36A-36D, respectively of cavity 46 when wrapper 22 and liner 26 are assembled.


With further reference to FIG. 8, during assembly a 3D vacuum insulated panel (“VIP”) core 68 may be assembled utilizing a mold tool 70 having a first or upper part 72 and a second or lower part 74 (see also step 203; FIG. 14). A first sheet of barrier material 76 may initially be positioned on surface 78 of second mold part 74 (see also step 204; FIG. 14). Surface 78 may be flat or it may be curved/cylindrical if a curved front surface 23 (FIG. 2) is to be formed. A plurality of rectangular sheets of material 40A are then stacked on top of first barrier sheet 76 to form a rectangular stack 50 corresponding to the front panel portion 44 (FIG. 3) of vacuum panel 20 (see also step 205; FIG. 14). A plurality of sheets 40B are then positioned on the rectangular stack 50 to form a frame stack 66 (see also step 206; FIG. 14). Additional sheets of fiberglass mat 40C, 40D, and 40E are then stacked to form a groove or channel 80 and a narrow wall portion 82 (see also step 207; FIG. 14). The sheets 40A-40E may be cut to have inner and/or outer peripheral edges with sizes and shapes as required to provide the proper three dimensional shape as required for a particular application.


After the sheets 40A-40E are stacked together, a second barrier sheet 77 is positioned over the sheets 40A-40E (see also step 208; FIG. 14). Upper mold part 72 is then lowered such that surface 84 of mold part 72 presses against second barrier sheet 77, and compresses the sheets 40A-40E (see also step 209; FIG. 14). The surface 84 of first mold part 72 has a surface contour that closely corresponds to the shape of the inner side surface of liner 26 such that the stacked sheets 40A-40E are compressed and formed to fit closely against liner 26. Similarly, surface 78 of mold part 74 has a shape that closely corresponds to the inner surface of wrapper 22 to provide a close fit. After the first and second mold parts 72 and 74, respectively of mold tool 70 are brought together to compress the sheets 40A-40E, a vacuum may be applied to evacuate air from between the barrier sheets 76 and 77 (see also step 210; FIG. 14). For example, the mold tool 70 may be positioned inside a vacuum chamber. Peripheral edge portions 76A and 77A of first and second barrier sheets 76 and 77, respectively, are then sealed such that the sheets 40A-40E are disposed within an airtight envelope 86 (see also FIG. 9, and step 211, FIG. 14). Barrier sheets may comprise known barrier material that is substantially impervious to gasses such as nitrogen, water vapor, oxygen, carbon monoxide, carbon dioxide, etc. It will be understood that sheets 40A-40E may be positioned inside an airtight envelope 86 having an opening prior to positioning the sheets 40A-40E in mold tool 70, and the opening of the envelope may be sealed while sheets 40A-40E are compressed in a vacuum.


With further reference to FIG. 9 the 3D core assembly 88 formed in mold tool 70 (FIG. 8) may be positioned in a second tool 90 having an upper part 92 and a lower part 94 (see also step 212; FIG. 14). Foam, adhesive, or other suitable material (not shown) may be positioned between wrapper 22 and 3D core 88, and between liner 26 and 3D core 88 (see also step 213; FIG. 14). The tool parts 92 and 94 are then brought together, and the wrapper 22 and liner 26 are interconnected in a known manner to form vacuum panel 20 (see also steps 214, 215; FIG. 14).


With further reference to FIG. 10, a 3D core 88A may be formed by positioning a plurality of sheets 40B-40E in a first or lower mold tool 98 of a mold tool 96 that also includes a second or upper mold part 100. A plurality of sheets of flexible fiberglass mat 102 are then positioned in rectangular cavity 46. As shown in FIG. 11, the sheets 102 have a generally rectangular perimeter 106 with linear sides 106A-106C. Notches 104A-104D are cut in the corners to form flaps 108A-108D. When the sheets 102 are positioned in cavity 46, the flaps 108A-108D are folded along fold lines 110A-110D, respectively such that the flaps 108A-108D extend upwardly along the sides of cavity 46. A second barrier sheet 77 is then positioned over the stacked sheets, and the second tool part 100 is shifted towards the first tool part 98 to thereby compress the sheets of material. A vacuum is then formed, and edges 76A and 77A of barrier sheets 76 and 77, respectively are then sealed together. The 3D core 88A may then be assembled with wrapper 22 and liner 26 in substantially the same manner as described above in connection with FIG. 9.


With further reference to FIGS. 12 and 13, a 3D core 88B may be formed utilizing a plurality of sheets 140, wherein each of the sheets has an outer edge or perimeter 142. The outer edges or perimeters 142 may have different sizes and/or shapes to thereby form side surfaces 146A-146D that may be angled or otherwise configured to be non-perpendicular to opposite sides 148 and 150 of 3D core 88. The 3D core 88B may be compressed in tools and sealed in an envelope (not shown) in substantially the same manner as described above in connection with FIG. 3. The 3D core 88B may then be assembled with a liner and wrapper as described above in connection with FIG. 9.


It is to be understood that variations and modifications can be made on the aforementioned structures and methods without departing from the concepts of the present device, and further it is to be understood that such concepts are intended to be covered by the following claims unless these claims by their language expressly state otherwise. For example, the processes described above may be utilized to form a wide range of insulted cabinet structures including doors, panels for doors, cabinets, panels for cabinets or virtually any other type of vacuum insulated structure.

Claims
  • 1. A method of making a vacuum insulated refrigerator structure, the method comprising: positioning a plurality of overlapping stacked sheets of a flexible core material that are disposed inside an envelope of impermeable barrier material between first and second mold parts of a mold tool;pressing the overlapping stacked sheets into a predefined three dimensional shape by pressing the first and second mold parts together;evacuating the overlapping stacked sheets utilizing a vacuum;sealing the envelope while the overlapping stacked sheets are evacuated to form a three dimensional vacuum core;removing the three dimensional vacuum core from the mold tool;positioning the three dimensional vacuum core between a wrapper and a liner; andinterconnecting the wrapper and the liner to form a vacuum insulated refrigerator structure.
  • 2. The method of claim 1, wherein: the sheets of flexible core material have peripheral edges defining shapes, and wherein the shapes of the peripheral edges of at least two sheets are not identical.
  • 3. The method of claim 1, wherein: a plurality of first adjacent stacked sheets of flexible core material are ring-shaped with enlarged central openings therethrough defining sizes, wherein the sizes of the openings are not equal.
  • 4. The method of claim 3, wherein: a plurality of second adjacent stacked adjacent sheets define outer peripheral edges having sizes that are smaller than the sizes of the enlarged central openings of the first adjacent stacked sheets, and wherein the outer peripheral edges of the plurality of second adjacent stacked sheets are spaced apart from the inner peripheral edges of the first adjacent stacked sheets to form a core groove therebetween.
  • 5. The method of claim 1, wherein: the liner includes a curved portion forming a raised ridge disposed in the core groove, and an exterior groove corresponding to the core grove; and including:positioning an elongated resilient gasket in the exterior groove.
  • 6. The method of claim 1, wherein: a first plurality of the overlapping stacked sheets of flexible core material have rectangular outer peripheral edges and enlarged rectangular openings therethrough defining rectangular inner peripheral edges to define a frame core having an enlarged rectangular opening therethrough having four side surfaces defined by the rectangular inner peripheral edges.
  • 7. The method of claim 6, including: forming a second plurality of sheets of flexible core material, each having a central portion and a generally rectangular perimeter with four edge portions and corner notches at each corner to define flaps at each edge portion;positioning the second plurality of sheets of flexible core material in the enlarged rectangular opening with the flaps extending transversely from the central portion along the four side surfaces of the enlarged rectangular opening.
  • 8. The method of claim 6, including: positioning a second plurality of sheets of flexible core material that do not have enlarged openings therethrough in a stacked relationship with the first plurality of overlapping stacked sheets of flexible core material to close off the enlarged openings such that the three dimensional vacuum core forms a cavity that opens towards the liner.
  • 9. The method of claim 1, wherein: the overlapping stacked sheets are evacuated while the overlapping stacked sheets are being pressed into a three dimensional shape by the first and second mold parts.
  • 10. The method of claim 1, wherein: the sheets of flexible core material comprise fiberglass mat.
  • 11. The method of claim 1, wherein: the liner comprises a thermoformed polymer material;the wrapper comprises sheet metal.
  • 12. A method of making a vacuum insulated refrigerator door having an inner side and an outer side, the method comprising: cutting a first plurality of sheets of fiberglass mat such that each sheet of the first plurality of sheets has a rectangular outer peripheral edge and a rectangular inner edge forming an enlarged central opening through each sheet of the first plurality of sheets;providing a second plurality of sheets of fiberglass mat, each sheet of the second plurality of sheets having a rectangular peripheral edge and a continuous central portion that does not have an opening therethrough;stacking the second plurality of sheets;stacking the first plurality of sheets with the second plurality of sheets to form a stacked assembly having a rectangular frame portion and an outer panel portion that together form an inwardly-opening rectangular cavity;forming an envelope of impermeable material around the stacked assembly;forming a vacuum inside the envelope;sealing the envelope to form a three dimensional vacuum core;positioning the three dimensional vacuum core between a wrapper and a liner; andinterconnecting the wrapper and the liner to form a vacuum insulated refrigerator door structure.
  • 13. The method of claim 12, including: pressing the stacked assembly between first and second mold parts.
  • 14. The method of claim 13, including: forming a vacuum inside the envelope while the stacked assembly is pressed between the first and second mold parts.
  • 15. The method of claim 12, wherein: each of the first plurality of sheets have substantially identical shapes and sizes.
  • 16. The method of claim 12, wherein: the rectangular outer peripheral edges and/or the rectangular inner edges of at least two of the first plurality of sheets are not identical in shape and/or size.
  • 17. The method of claim 12, wherein: the first plurality of sheets includes a plurality of outer sheets adjacent the second plurality of sheets, and a plurality of inner sheets that are disposed away from the second plurality of sheets with the plurality of outer sheets disposed between the plurality of inner sheets and the second plurality of sheets;the shapes and sizes of the rectangular inner edges of the plurality of outer sheets are substantially identical to the shapes and sizes of the rectangular inner edges of the plurality of rectangular inner edges of the plurality of inner sheets to form a rectangular cavity having four sides that are generally flat;the rectangular outer perimeters of the inner sheets are smaller than the rectangular outer perimeters of the outer sheets such that the outer sheets define a step;the liner includes first and second transverse surfaces forming a step that fits over the step formed by the first plurality of sheets, wherein the first surface faces opposite the outer side of the refrigerator door, and the second surface includes four portions that face away from the rectangular cavity; and including:securing an elongated resilient gasket to the first surface of the liner.
CROSS REFERENCE TO RELATED APPLICATIONS

The present application is a division of U.S. patent application Ser. No. 16/093,238, filed on Oct. 12, 2018, now U.S. Pat. No. 11,009,284, issued on May 18, 2021, which claims the priority benefits of International Patent Application No. PCT/US2016/027722, filed on Apr. 15, 2016, the entire disclosures of which are incorporated herein by reference.

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Related Publications (1)
Number Date Country
20210231359 A1 Jul 2021 US
Divisions (1)
Number Date Country
Parent 16093238 US
Child 17232630 US