CA2076568A1 - Insulating jacket for electric water heating tank - Google Patents
Insulating jacket for electric water heating tankInfo
- Publication number
- CA2076568A1 CA2076568A1 CA 2076568 CA2076568A CA2076568A1 CA 2076568 A1 CA2076568 A1 CA 2076568A1 CA 2076568 CA2076568 CA 2076568 CA 2076568 A CA2076568 A CA 2076568A CA 2076568 A1 CA2076568 A1 CA 2076568A1
- Authority
- CA
- Canada
- Prior art keywords
- tank
- insulating
- inner casing
- casing
- wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Landscapes
- Heat-Pump Type And Storage Water Heaters (AREA)
- Details Of Fluid Heaters (AREA)
Abstract
INSULATING JACKET FOR ELECTRIC WATER HEATING TANK
ABSTRACT
An insulating jacket for a cylindrical electric, oil or gas water heater tank is formed by a circular base of rigid molded insulating foam material having a flat bottom wall and a concentrically disposed support dome on a top face thereof shaped for close fit within a bottom cavity of the tank for support engagement in at least sections thereof with a bottom wall of an inner casing of the tank. A spacer ledge is defined above the support dome and extends to an outer edge of the flat circular base beyond the inner casing. An insulating sleeve is provided about a side wall of the tank and extends over the spacer ledge. A layer of reflective material is disposed about the side wall with the insulating sleeve thereover. A rigid insulat-ing cap of molded foam material is positioned over a top wall of the tank inner casing and extends substan-tially flush with an outer surface of the insulting sleeve. An outer metal tank casing is provided about the insulating sleeve and the insulating cap.
ABSTRACT
An insulating jacket for a cylindrical electric, oil or gas water heater tank is formed by a circular base of rigid molded insulating foam material having a flat bottom wall and a concentrically disposed support dome on a top face thereof shaped for close fit within a bottom cavity of the tank for support engagement in at least sections thereof with a bottom wall of an inner casing of the tank. A spacer ledge is defined above the support dome and extends to an outer edge of the flat circular base beyond the inner casing. An insulating sleeve is provided about a side wall of the tank and extends over the spacer ledge. A layer of reflective material is disposed about the side wall with the insulating sleeve thereover. A rigid insulat-ing cap of molded foam material is positioned over a top wall of the tank inner casing and extends substan-tially flush with an outer surface of the insulting sleeve. An outer metal tank casing is provided about the insulating sleeve and the insulating cap.
Description
-2~7~68 TECHNICAL FIELD
The present invention relates to an insulating jacket which completely surrounds an electric or gas water heater tank and disposed between the tank inner and out~r casings, and which is comprised of an ~insul~ting support base, an insulating sleeve, and an in~ulating cap, with the cap and sleeve being received within an outer casing of the tank.
BACKGROUND ART
Hot water tanks are constructed of an inner casing in which water is heated by electrical resistive elements or a gas or oil burner. An outer casing is spaced from the inner casing and insulating fiberglass material is positioned between the side wall of the tank inner casing and the outer casing. A metal cover is usually disposed on top of the tank over the outer casing and usually in contact with the top wall of the inner casing. The waterline coupling on the top wall of the tank protrudes through the cover.
A disadvantage of this type of tank construction is that there is no insulation of the tank in the bottom wall or top wall thereof where there is considerable heat loss.
It is also known in the prior art to wrap an insulatlng blanket about the outer casing to minimize heat loss therethrough.
~...
SUMMARY OF INVENTION -.
It is a feature of the present invention to provide an insulating jacket which completely surrounds the inner casing of a hot water heating tank and which substantially overcomes the above-mentioned disadvan- ~
tages of the prior art hot water tank insulation. - `
~,o~ ~68 According to another feature of the present inven-tion there is provided an insulating jacket for a hot water tank inner casing and comprised of an insulating base, an insulating side wall sleeve, and an insulating top wal.l cap, with the cap and the base being molded from foam insulat.ing material.
~ ccording -to the above features, from a broad aspect, the present invention provides an insulating jacket ~or a water heater tank inner casing. The jacket is formed by a circular base of rigid molded insulating foam material having a flat bottom wall and a concentrically disposed support dome on a top face thereof, and shaped for close fit within a bottom cavity of the tank for support engagement in at least sections thereof with a bottom wall of the inner casing of the tank. A spacer ledge is defined about the support dome and extends to an outer edge of the flat circular base beyond the inner casing. An insulating material is disposed about a side wall of the tank and extends over the spacer ledge. A layer of reflective sheet material is positioned about the side wall of the inner casing with the insulating material thereover. A
rigid insulating cap of molded insulating foam material is positioned over a top wall of the tank inner casing and extends substantially flush with an outer surface of the insulating sleeve. An outer metal tank casing is provided about the side wall insulating material and the insulating cap and extending to the support base.
According to a further broad aspect, there is provided in a cylindrical water heating tank having an insulating material disposed between a side wall of an :
inner casing of said tank and a spaced outer casing, said tank supported on an insulating base formed of thermally insulating material, the improvement compris-ing a rigid insulating cap of molded insulating foam .
' - 3 - 20~
material positioned in contact over a top wall of said tank inner casing and extending substantially flush wi-th an inner surface of said outer casing, said outer casing extending over said insulating cap.
~RIE~ DESCRIPTION OF DRAWINGS
A pxe~erred embodiment of the present invention wilL now be described with reference to the accompany-ing drawings in which:
FIGURE 1 is a fragmented view, partly in section, of a cylindrical electric water heater tank incorporat-ing the insulating jacket of the present invention; and FIGURE 2 is a section view of the bottom section of a cylindrical electric water heater of the prior art.
.
DESCRIPTION OF PREFERRED EMBODIMENTS
Referring now to the drawings, and more particu-larly to Figure 1, there is shown generally at 10 a water heater tank having an inner casing 11 defining a side wall 11', a top wall 14, and a bottom wall 16 formed as a dome cavity. Electrical resistive heating elements 15 and 15' are spaced within the hot water tank casing 10 to heat the water therein. The tank could be fitted with a gas burner instead of eleatrical resistive elements to heat the water. A coupling 9 is provided in the-top wall 14 to connect to a hot water-line. A cold water inlet coupling 8 is further provided adjacent the bottom wall 16 of the tank.
As shown in Figure 1, the tank inner casing is `
supported on a circular base 20 of rigid molded insulating foam material. The base has a flat bottom wall 21 having a concentrically disposed support dome 22 which is herein formed by radiating dome-shaped ribs 22'. The dome top surface is shaped for close fit within the bottom cavity 16 for support engagement with , ':` :
`:
The present invention relates to an insulating jacket which completely surrounds an electric or gas water heater tank and disposed between the tank inner and out~r casings, and which is comprised of an ~insul~ting support base, an insulating sleeve, and an in~ulating cap, with the cap and sleeve being received within an outer casing of the tank.
BACKGROUND ART
Hot water tanks are constructed of an inner casing in which water is heated by electrical resistive elements or a gas or oil burner. An outer casing is spaced from the inner casing and insulating fiberglass material is positioned between the side wall of the tank inner casing and the outer casing. A metal cover is usually disposed on top of the tank over the outer casing and usually in contact with the top wall of the inner casing. The waterline coupling on the top wall of the tank protrudes through the cover.
A disadvantage of this type of tank construction is that there is no insulation of the tank in the bottom wall or top wall thereof where there is considerable heat loss.
It is also known in the prior art to wrap an insulatlng blanket about the outer casing to minimize heat loss therethrough.
~...
SUMMARY OF INVENTION -.
It is a feature of the present invention to provide an insulating jacket which completely surrounds the inner casing of a hot water heating tank and which substantially overcomes the above-mentioned disadvan- ~
tages of the prior art hot water tank insulation. - `
~,o~ ~68 According to another feature of the present inven-tion there is provided an insulating jacket for a hot water tank inner casing and comprised of an insulating base, an insulating side wall sleeve, and an insulating top wal.l cap, with the cap and the base being molded from foam insulat.ing material.
~ ccording -to the above features, from a broad aspect, the present invention provides an insulating jacket ~or a water heater tank inner casing. The jacket is formed by a circular base of rigid molded insulating foam material having a flat bottom wall and a concentrically disposed support dome on a top face thereof, and shaped for close fit within a bottom cavity of the tank for support engagement in at least sections thereof with a bottom wall of the inner casing of the tank. A spacer ledge is defined about the support dome and extends to an outer edge of the flat circular base beyond the inner casing. An insulating material is disposed about a side wall of the tank and extends over the spacer ledge. A layer of reflective sheet material is positioned about the side wall of the inner casing with the insulating material thereover. A
rigid insulating cap of molded insulating foam material is positioned over a top wall of the tank inner casing and extends substantially flush with an outer surface of the insulating sleeve. An outer metal tank casing is provided about the side wall insulating material and the insulating cap and extending to the support base.
According to a further broad aspect, there is provided in a cylindrical water heating tank having an insulating material disposed between a side wall of an :
inner casing of said tank and a spaced outer casing, said tank supported on an insulating base formed of thermally insulating material, the improvement compris-ing a rigid insulating cap of molded insulating foam .
' - 3 - 20~
material positioned in contact over a top wall of said tank inner casing and extending substantially flush wi-th an inner surface of said outer casing, said outer casing extending over said insulating cap.
~RIE~ DESCRIPTION OF DRAWINGS
A pxe~erred embodiment of the present invention wilL now be described with reference to the accompany-ing drawings in which:
FIGURE 1 is a fragmented view, partly in section, of a cylindrical electric water heater tank incorporat-ing the insulating jacket of the present invention; and FIGURE 2 is a section view of the bottom section of a cylindrical electric water heater of the prior art.
.
DESCRIPTION OF PREFERRED EMBODIMENTS
Referring now to the drawings, and more particu-larly to Figure 1, there is shown generally at 10 a water heater tank having an inner casing 11 defining a side wall 11', a top wall 14, and a bottom wall 16 formed as a dome cavity. Electrical resistive heating elements 15 and 15' are spaced within the hot water tank casing 10 to heat the water therein. The tank could be fitted with a gas burner instead of eleatrical resistive elements to heat the water. A coupling 9 is provided in the-top wall 14 to connect to a hot water-line. A cold water inlet coupling 8 is further provided adjacent the bottom wall 16 of the tank.
As shown in Figure 1, the tank inner casing is `
supported on a circular base 20 of rigid molded insulating foam material. The base has a flat bottom wall 21 having a concentrically disposed support dome 22 which is herein formed by radiating dome-shaped ribs 22'. The dome top surface is shaped for close fit within the bottom cavity 16 for support engagement with , ':` :
`:
- 4 - 207 ~8 the bottom wall 16 of the tank. A spacer ledge 23 is defined about the support base and extends to an outer edge 2~ thereof beyond the inner casing side wall 11' and for close fit within the base of an outer casing 1.2.
A la~er of reflective sheet material 26 is dlsposed about the side wall of the tank. This reflec-tive material may be formed of metallic foil shee-ting, or Oe a plastic sheet that has a reflective power capable of withstanding the heat generated by the hot water tank and acting as a thermal barrier. An insulating sleeve 13 of insulating material, such as fiberglass or equivalent fiber material is rolled in one or more layers about the reflective material 26 to eliminate the chimney effect on the side wall of the inner casing. The fiberglass has a specific density as required to provide proper insulation of the side wall.
The use of this insulation is known in the prior art, but the reflective material disposed directly between the tank inner casing and the insulating fiberglass sheeting further cuts the heat loss.
A rigid thick insulating cap 27 of molded insulat-ing foam material, such as polystyrene which is free of CFE, is positioned over the top wall 14 of the tank inner casing, and extends outwardly substantially flush with the outer surface of the side wall insulating -layer or sleeve 13. The outer casing 12 receives both the insulating sleeve 13 about the side wall and the insulating cap 27. Accordingly, the inner casing is completely enveloped with an insulating material. The outer casing 12 is also provided with removable panels 28 for access to various accessories connected to the tank inner casing, such as the couplings 8 and 9, electrical wiring for the resistive heating elements 15, controls to adjust the temperature of the water, etc.
.
..... . . . . .. . . . . ~ . - , , -207~8 As shown in Figure 1, the tank inner casing 11 is also suppor-ted entirely on the insulating base. Also, the insulating cap 27 is provided with cavities or through bores, such as bore 29, to receive fittings or okher accessories that may be provided on the outside surEace of the top wall 1~ of the inner casing. The support base 20 is also formed with a circumferential ;Locatin~ channel 30 in the top face of the spacer ledge 23 and positioned immediately about the support dome to receive a lower flange edge 25 of the tank inner casing and in sealing engagement therewith.
Figure 2 illustrates a prior art design, and as herein shown, the surface of the bottom wall 16 of the inner casing is not in support contact with the base, and accordingly the load of the tank is not distributed -over the insulated base 19, but peripherally about the tank. ~his provides for the circumferential edge 30 bearing all the load and damaging the insulating base 19. With this type of construction, there is heat loss through the bottom wall 16 of the inner casing. -Although not shown, the top wall of these tanks are also not insulated. Also, the side wall is provided with fiberglass insulation 13' which is often loosely packed and is in direct contact with the inner casing outer side wall 11'. There is no barrier layer on the inner casing.
It is within the ambit of the present invention to cover any obvious modifications of the preferred embodiment described herein, provided such modifica-tions fall within the scope of the appended claims.
For example, the outer casing may be formed in two sections, and namely with an open ended cylindrical sleeve to fit over and spaced from the side wall 11' of the inner casing 11, and a top cover section which secures to the top end of the cylinder to receive the insulating cap therein. This would facilitate the ; " ' ~~ - 6 - 207~8 assembly and properly dispose the fiberglass insulation in the top edge of the tank. Also, the insulating cap 27 may be formed to extend entirely over the dome-shaped top wall of the tank, and even extend downwardly i.n a top portion oE the tank side wall. Although the tank as herein shown has a dome-shaped top wall, it may also have a flat top wall and the insulating cap 27 would be molded to adapt to the flat top wall and its couplings. As shown in Figure 1 the tank is provided with a Eurther heating element 38 secured by the strap-ping 37 to the side wall of the tank to provide further heating of the water in the lower por-tion of the tank, and this prevents the formation of bacteria legionella.
The insulating jacket 13 as well as the reflective aluminum foil sheeting 26 extends over this auxiliary heater 38.
A la~er of reflective sheet material 26 is dlsposed about the side wall of the tank. This reflec-tive material may be formed of metallic foil shee-ting, or Oe a plastic sheet that has a reflective power capable of withstanding the heat generated by the hot water tank and acting as a thermal barrier. An insulating sleeve 13 of insulating material, such as fiberglass or equivalent fiber material is rolled in one or more layers about the reflective material 26 to eliminate the chimney effect on the side wall of the inner casing. The fiberglass has a specific density as required to provide proper insulation of the side wall.
The use of this insulation is known in the prior art, but the reflective material disposed directly between the tank inner casing and the insulating fiberglass sheeting further cuts the heat loss.
A rigid thick insulating cap 27 of molded insulat-ing foam material, such as polystyrene which is free of CFE, is positioned over the top wall 14 of the tank inner casing, and extends outwardly substantially flush with the outer surface of the side wall insulating -layer or sleeve 13. The outer casing 12 receives both the insulating sleeve 13 about the side wall and the insulating cap 27. Accordingly, the inner casing is completely enveloped with an insulating material. The outer casing 12 is also provided with removable panels 28 for access to various accessories connected to the tank inner casing, such as the couplings 8 and 9, electrical wiring for the resistive heating elements 15, controls to adjust the temperature of the water, etc.
.
..... . . . . .. . . . . ~ . - , , -207~8 As shown in Figure 1, the tank inner casing 11 is also suppor-ted entirely on the insulating base. Also, the insulating cap 27 is provided with cavities or through bores, such as bore 29, to receive fittings or okher accessories that may be provided on the outside surEace of the top wall 1~ of the inner casing. The support base 20 is also formed with a circumferential ;Locatin~ channel 30 in the top face of the spacer ledge 23 and positioned immediately about the support dome to receive a lower flange edge 25 of the tank inner casing and in sealing engagement therewith.
Figure 2 illustrates a prior art design, and as herein shown, the surface of the bottom wall 16 of the inner casing is not in support contact with the base, and accordingly the load of the tank is not distributed -over the insulated base 19, but peripherally about the tank. ~his provides for the circumferential edge 30 bearing all the load and damaging the insulating base 19. With this type of construction, there is heat loss through the bottom wall 16 of the inner casing. -Although not shown, the top wall of these tanks are also not insulated. Also, the side wall is provided with fiberglass insulation 13' which is often loosely packed and is in direct contact with the inner casing outer side wall 11'. There is no barrier layer on the inner casing.
It is within the ambit of the present invention to cover any obvious modifications of the preferred embodiment described herein, provided such modifica-tions fall within the scope of the appended claims.
For example, the outer casing may be formed in two sections, and namely with an open ended cylindrical sleeve to fit over and spaced from the side wall 11' of the inner casing 11, and a top cover section which secures to the top end of the cylinder to receive the insulating cap therein. This would facilitate the ; " ' ~~ - 6 - 207~8 assembly and properly dispose the fiberglass insulation in the top edge of the tank. Also, the insulating cap 27 may be formed to extend entirely over the dome-shaped top wall of the tank, and even extend downwardly i.n a top portion oE the tank side wall. Although the tank as herein shown has a dome-shaped top wall, it may also have a flat top wall and the insulating cap 27 would be molded to adapt to the flat top wall and its couplings. As shown in Figure 1 the tank is provided with a Eurther heating element 38 secured by the strap-ping 37 to the side wall of the tank to provide further heating of the water in the lower por-tion of the tank, and this prevents the formation of bacteria legionella.
The insulating jacket 13 as well as the reflective aluminum foil sheeting 26 extends over this auxiliary heater 38.
Claims (11)
1. An insulating jacket for a cylindrical water heating tank inner casing, said jacket being formed by a circular base of rigid molded insulating foam material having a flat bottom wall and a concentrically disposed support dome on a top face thereof and shaped for close fit within a bottom cavity of said tank for support engagement in at least sections thereof with a bottom wall of said inner casing of said tank, and a spacer ledge defined about said support base and extending to an outer edge of said flat circular base beyond said inner casing, an insulating material about a side wall of said tank and extending over said spacer ledge, a layer of heat reflective sheet material disposed about said side wall with said insulating material thereover, and a rigid insulating cap of molded insulating foam material positioned in contact over a top wall of said tank inner casing and extending substantially flush with an inner surface of said outer casing, and an outer metal tank casing about said side wall insultaing material and said insulating cap and extending to said support base.
2. An insulating jacket for a water heater tank inner casing as claimed in claim 1 wherein said tank inner casing is supported on said flat wall of said base of insulating foam material, said insulating material being formed by one or more layers of insulating fiber-glass sheet material having a desired density.
3. An insulating jacket for a water heater tank inner casing as claimed in claim 2 wherein said rigid insulating cap is a disc having a flat top wall and a shaped inner wall to receive said top wall of said tank inner casing in contact fit therewith, said shaped inner wall having cavities to receive accessories on said tank top wall.
4. An insulating jacket for a water heater tank inner casing as claimed in claim 3 wherein said outer metal tank casing is provided with removable panels for access to accessories provided on said tank inner casing.
5. An insulating jacket for a water heater tank inner casing as claimed in claim 2 wherein said layer of reflective material is a layer of an aluminum foil sheet.
6. An insulating jacket for a water heater tank inner casing as claimed in claim 2 wherein said layer of reflective material is a layer of a plastic sheet having a heat reflective property and capable of withstanding maximum heat generated by said water heater.
7. An insulating jacket for a water heater tank inner casing as claimed in claim 2 wherein said rigid insulating cap is molded from polysltyrene material free of CFE.
8. An insulating jacket for a water heater tank inner casing as claimed in claim 2 wherein a circular locat-ing channel is disposed in a top face of said spacer ledge and positioned immediately about said support dome to receive a lower flange edge of said inner casing in sealing engagement therewith.
9. In a cylindrical water heating tank having an insulating material disposed between a side wall of an inner casing of said tank and a spaced outer casing, said tank being supported on a base formed of thermally insulating material, the improvement comprising a rigid insulating cap of molded insulating foam material positioned in contact over a top wall of said tank inner casing and extending substantially flush with an inner surface of said outer casing, said outer casing extending over said insulating cap.
10. A water heating tank as claimed in claim 9 wherein there is further provided a layer of reflective material disposed in contact about said inner casing side wall.
11. A water heating tank as claimed in claim 9 wherein said tank is supported on an insulating base.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US93136792A | 1992-08-08 | 1992-08-08 | |
| US931,367 | 1992-08-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2076568A1 true CA2076568A1 (en) | 1994-02-09 |
Family
ID=25460679
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2076568 Abandoned CA2076568A1 (en) | 1992-08-08 | 1992-08-21 | Insulating jacket for electric water heating tank |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2076568A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110553403A (en) * | 2018-05-30 | 2019-12-10 | 青岛经济技术开发区海尔热水器有限公司 | Water pipe positioning tool for water heater |
| CN116270212A (en) * | 2023-05-17 | 2023-06-23 | 南昌大学 | Multifunctional intelligent moxibustion and acupuncture combined therapeutic instrument |
-
1992
- 1992-08-21 CA CA 2076568 patent/CA2076568A1/en not_active Abandoned
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110553403A (en) * | 2018-05-30 | 2019-12-10 | 青岛经济技术开发区海尔热水器有限公司 | Water pipe positioning tool for water heater |
| CN110553403B (en) * | 2018-05-30 | 2023-04-18 | 青岛经济技术开发区海尔热水器有限公司 | Water pipe positioning tool for water heater |
| CN116270212A (en) * | 2023-05-17 | 2023-06-23 | 南昌大学 | Multifunctional intelligent moxibustion and acupuncture combined therapeutic instrument |
| CN116270212B (en) * | 2023-05-17 | 2023-10-24 | 南昌大学 | Multifunctional intelligent moxibustion and acupuncture combined therapeutic instrument |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |