Patent Publication Number: US-2019194964-A1

Title: Thermal insulation system for pool

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application claims priority to the following Chinese patent application, the disclosure of which is hereby expressly incorporated by reference herein in its entirety: 
     
       
         
           
               
               
               
             
               
                   
                   
               
               
                   
                 Application No. 
                 Filing Date 
               
               
                   
                   
               
             
            
               
                   
                 CN 2016210296961 
                 Aug. 31, 2016 
               
               
                   
                   
               
            
           
         
       
     
     FIELD OF THE DISCLOSURE 
     The present disclosure relates to a thermal insulation structure for a liquid enclosure, and more particularly, to a thermal insulation structure for a pool or spa including a cover and/or a plug. 
     BACKGROUND OF THE DISCLOSURE 
     When a pool or spa is unused, the temperature of the liquid in the pool or spa can change based on the temperature of the ambient environment. For example, in the case of an outdoor pool or spa, the temperature of the liquid may increase during daytime hours due to the presence of heat from the sun and decrease during nighttime hours due to the lack of heat from the sun. Additionally, in pools or spas with heating capabilities, additional energy may be required by the heating system to maintain the temperature of the liquid when the liquid temperature decreases due to heat dissipation. 
     Current thermal insulation methods involve applying a thermal insulation structure at a side wall of the pool or spa. However, this kind of thermal insulation structure does not mitigate the heat loss via the opening or water cavity of the pool or spa. Improvements in the foregoing are desired. 
     SUMMARY 
     The present disclosure provides a thermal insulation structure for liquid enclosures where the thermal insulation structure improves the liquid enclosure&#39;s thermal insulation thereby requiring less work by external components to maintain the temperature within the liquid enclosure. The thermal insulation structure includes a cover and a plug. Both the cover and the plug each include a plurality of layers, which contribute to their insulating properties. According to an embodiment of the present disclosure, an insulation structure configured for use with a liquid enclosure is provided. The insulation structure includes: a cover including an inner coating that faces the liquid enclosure and an outer coating that faces the ambient environment; the inner coating including a thermal insulation layer comprising at least one insulating material; and the outer coating including a reflective layer adjacent to the inner coating. In one particular embodiment, the thermal insulation layer defines an inflatable air chamber. In another particular embodiment, the inflatable air chamber is filled with at least one insulating material. In yet another particular embodiment, the at least one insulating material includes a polymer sponge or foam, mineral wool, cellulose insulation, fiber insulation, or fleece. In another particular embodiment, the reflective layer has a high refractive index to reflect incoming solar radiation. In another embodiment, the reflective layer includes a polymer base layer coated with a metal coating layer. 
     In another particular embodiment, the polymer base layer is selected from the group consisting of: oriented polypropylene, polyethylene terephthalate (PET), nylon and cast polypropylene; and the metal coating layer is selected from the group consisting of: aluminum, nickel, and chromium. In yet another particular embodiment, the inner coating further including an external film that coats the thermal insulation layer. In another embodiment, the liquid enclosure includes a side wall coupled to a bottom wall to define a cavity that receives a liquid, the cover being sized to cover the cavity and hang at least partially over the side wall. In another particular embodiment, the outer coating further includes a flexible layer adjacent to the reflective layer, wherein the reflective layer is closer to the liquid enclosure. 
     According to another particular embodiment of the present disclosure, an insulation structure configured for use with a liquid enclosure having a side wall coupled to a bottom wall to define a cavity that receives a liquid is provided. The insulation structure includes: a first insulation layer; a second insulation layer; a third insulation layer positioned between the first insulation layer and the second insulation layer, wherein the third insulation layer is an inflatable air chamber. In one particular embodiment, the first insulation layer includes at least one insulating material including: a polymer sponge or foam, mineral wool, cellulose insulation, fiber insulation, or fleece. In another particular embodiment, the inflatable air chamber of the third insulation layer is filled with at least one insulating material including: a polymer sponge or foam, mineral wool, cellulose insulation, fiber insulation, or fleece. In another particular embodiment, the second insulation layer faces the liquid enclosure and the first insulation layer faces the ambient environment. In another particular embodiment, the plug is configured to float on the liquid in the cavity of the liquid enclosure. 
     According to yet another embodiment of the present disclosure, an insulation system configured for use with a liquid enclosure having a sidewall coupled to a bottom panel to define a cavity configured to contain a liquid is provided. The insulation system includes: a cover including an inner coating that faces the liquid enclosure and an outer coating that faces the ambient environment; the inner coating including a thermal insulation layer comprising at least one insulating material; and the outer coating including a reflective layer adjacent to the inner coating; a plug coupled to the liquid enclosure and positioned intermediate the cover and the cavity, the plug further including: a first insulation layer; a second insulation layer; a third insulation layer positioned between the first insulation layer and the second insulation layer. In one particular embodiment, the cover is integrally formed with the plug. In another embodiment, the first insulation layer and the second insulation layer of the plug each includes at least one insulating material including a polymer sponge or foam, mineral wool, cellulose insulation, fiber insulation, or fleece; and the third insulation layer of the plug is an inflatable air chamber. In yet another particular embodiment, the third insulation layer of the plug is filled with at least one insulating material including: a polymer sponge or foam, mineral wool, cellulose insulation, fiber insulation, or fleece. In another particular embodiment, the second insulation layer of the plug faces the liquid enclosure and the outer coating of the cover faces the ambient environment. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above-mentioned and other features and advantages of this disclosure, and the manner of attaining them, will become more apparent and will be better understood by reference to the following description of embodiments of the invention taken in conjunction with the accompanying drawings, wherein: 
         FIG. 1  is a cross-sectional view of an insulated liquid enclosure with a thermally insulated cover in accordance with the present disclosure; 
         FIG. 2  is a cross-sectional view of an insulated liquid enclosure with a thermally insulated plug in accordance with the present disclosure; 
         FIG. 3  is a cross-sectional view of an insulated liquid enclosure with the thermally insulated cover of  FIG. 1  and the thermally insulated plug of  FIG. 2 ; and 
         FIG. 4  is a detailed, cross-sectional view of a thermally insulated outer coating of the thermally insulated cover of  FIG. 1 ; 
         FIG. 5  is a detailed, cross-sectional view of a thermally insulated inner coating of the thermally insulated cover of  FIG. 1 ; and 
         FIG. 6  is a detailed, cross-sectional view of the thermally insulated plug of  FIG. 2 . 
     
    
    
     Corresponding reference characters indicate corresponding parts throughout the several views. The exemplifications set out herein illustrate exemplary embodiments of the invention and such exemplifications are not to be construed as limiting the scope of the invention in any manner 
     DETAILED DESCRIPTION 
     For the purposes of promoting an understanding of the principles of the invention, reference will now be made to the embodiments illustrated in the drawings, which are described below. The embodiments disclosed below are not intended to be exhaustive or limit the invention to the precise form disclosed in the following detailed description. Rather, the embodiments are chosen and described so that others skilled in the art may utilize their teachings. It will be understood that no limitation of the scope of the invention is thereby intended. The invention includes any alterations and further modifications in the illustrative devices and described methods and further applications of the principles of the invention which would normally occur to one skilled in the art to which the invention relates. 
     Referring to  FIG. 1 , a liquid enclosure  4 , such as a swimming pool or spa, is provided having an internal cavity  40  where liquid  41  resides between side walls  42  and bottom wall  44 . Side walls  42  of the illustrative liquid enclosure  4  are inflatable structures, but it is also within the scope of the present disclosure for side walls  42  to include a non-inflatable liner coupled to a frame, for example. Also, the illustrative liquid enclosure  4  is an above-ground structure, but it is also within the scope of the present disclosure for liquid enclosure  4  to be a built-in or below-ground structure. 
     A cover  10  is coupled to the liquid enclosure  4  and covers internal cavity  40  of liquid enclosure  4  and liquid  41  contained therein. Cover  10  also hangs over the side walls  42  toward bottom wall  44  of liquid enclosure  4  in  FIG. 1 . At least one fastening structure (not shown), such as a rope or elastic cord, may be used to tie or otherwise secure the cover  10  to side walls  42  of liquid enclosure  4 . Other suitable fastening structures may include clips, pins, snaps, fasteners, etc. 
     Cover  10  insulates liquid enclosure  4  from external or ambient environmental conditions. As shown in  FIG. 1 , cover  10  includes an outer coating  1  that faces the ambient environment and at least one inner coating  2  that faces liquid enclosure  4 . Although a single inner coating  2  is shown in  FIG. 1 , it is within the scope of the present disclosure for a plurality of inner coatings  2  to be stacked on outer coating  1 . 
     As shown in  FIG. 4 , outer coating  1  of cover  10  includes a flexible layer  11  and a reflective layer  12 , where flexible layer  11  is illustratively positioned outside of reflective layer  12 . That is, reflective layer  12  is closer to liquid  41  of liquid enclosure  4  and flexible layer  11  is closer to the ambient environment. The physical properties of flexible layer  11  and reflective layer  12  serve to insulate liquid enclosure  4  from external or ambient environmental conditions. Flexible layer  11  may be porous (i.e., have holes) or transparent to at least partially expose the underlying reflective layer  12  to the ambient environment while also insulating the underlying liquid enclosure  4 . Flexible layer  11  may be made of a woven material, polyvinyl chloride (PVC) patch material, PVC netting material, or another suitable film material. Reflective layer  12  has a high refractive index to reflect incoming solar radiation that passes through flexible layer  11  away from liquid  41  in liquid enclosure  4 , rather than absorbing and transmitting the radiation to liquid  41  in liquid enclosure  4 . Thus, reflective layer  12  may avoid undesired heating of liquid  41  in liquid enclosure  4 . Reflective layer  12  may be made of a metallized film or another material having a high refractive index. Metallized films have insulating properties and are resistant to radiation. Exemplary metallized films include a polymer base layer, such as oriented polypropylene, polyethylene terephthalate (PET), nylon, or cast polypropylene, and a thin metal coating layer, such as aluminum, nickel, or chromium. However, it is contemplated that other metallized films may also be used. Flexible layer  11  and reflective layer  12  also cooperate to prevent heat/energy dissipation and evaporation from liquid enclosure  4  to the ambient environment by providing a physical barrier over the entirety of internal cavity  40  of liquid enclosure  4 . 
     As shown in  FIG. 5 , inner coating  2  of cover  10  includes an insulation layer  21  that is coated by an external film  22 . External film  22  may be waterproof to help protect the underlying insulation layer  21 , if necessary. External film  22  may be made of PVC film material, PVC netting material, or another suitable film material. Insulation layer  21  may include one or more insulating materials each having a low thermal conductivity to resist heat transfer to and from liquid  41  in liquid enclosure  4 . Insulation layer  21  may define an inflatable air chamber with an air valve (not shown). When cover  10  is in use, the air chamber of insulation layer  21  may be filled with air, which has a low thermal conductivity. When cover  10  is not in use, the air chamber of insulation layer  21  may be deflated for storage. Instead of or in addition to air, insulation layer  21  may include other insulating materials such as polymer sponges or foams (e.g., polyurethane (PU) foam, PVC foam, expanded polyethylene (EPE) foam (i.e., pearl wool)), mineral wool, cellulose insulation, fiber insulation, or fleece, for example. In embodiments where these insulating materials are used inside the air chamber, the materials may be capable of collapsing and folding when the air chamber is deflated to facilitate storage of cover  10 . 
     Referring now to  FIG. 2 , a plug  3  is sized for receipt in internal cavity  40  of liquid enclosure  4  in a manner that spans and closes internal cavity  40  of liquid enclosure  4  such that cavity  40  is not exposed to the external environment (e.g., ambient temperature conditions, etc.). Plug  3  may include a cover body  5  integrally connected or otherwise coupled to plug  3 . The illustrative cover body  5  rests atop the side walls  42  of liquid enclosure  4  and allows plug  3  to hover over liquid enclosure  4  such that plug  3  closes cavity  40  of liquid enclosure  4  as mentioned earlier. Plug  3  may have a lower density than liquid  41 , which enables plug  3  to float on liquid  41  and may eliminate the need for cover body  5 . 
     As shown in  FIG. 6 , plug  3  further includes a plug body  20  that includes a first or upper layer  31 , a second or lower layer  33 , and a third or intermediate layer  32  positioned between first layer  31  and second layer  33 . First layer  31  and second layer  33  may be made of insulating materials similar to those described above with respect to insulation layer  21 , such as polymer sponges or foams (e.g., polyurethane (PU) foam, PVC foam, expanded polyethylene (EPE) foam (i.e., pearl wool)), mineral wool, cellulose insulation, fiber insulation, or fleece, for example. Third layer  32  may define an inflatable air chamber with an air valve (not shown). When plug  3  is in use, the air chamber of third layer  32  may be filled with air, which has a low thermal conductivity. When plug  3  is not in use, the air chamber of third layer  32  may be deflated for storage. It is also within the scope of the present disclosure to fill the air chamber of third layer  32  with insulating materials, as described above with respect to insulation layer  21 . 
     Referring to  FIG. 3 , a combined insulation structure  30  is used to cover liquid enclosure  4  and provide thermal insulation to liquid enclosure  4  and liquid  41  within cavity  40 . Insulation structure  30  is removably coupled to liquid enclosure  4  and includes both cover  10  and plug  3 . The central portion of cover  1  may be integrally formed with or otherwise coupled to plug  3 . Cover  10  and plug  3  of the combined insulation structure  30  may have the same properties as previously described herein with respect to  FIGS. 1-2 and 4-6 . 
     While this invention has been described as having exemplary designs, the present invention can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles. Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains and which fall within the limits of the appended claims.