GB2458826A - Water heater comprising an expansion tank - Google Patents

Water heater comprising an expansion tank Download PDF

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Publication number
GB2458826A
GB2458826A GB0908968A GB0908968A GB2458826A GB 2458826 A GB2458826 A GB 2458826A GB 0908968 A GB0908968 A GB 0908968A GB 0908968 A GB0908968 A GB 0908968A GB 2458826 A GB2458826 A GB 2458826A
Authority
GB
United Kingdom
Prior art keywords
expansion
tank
water heater
main tank
bladder
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.)
Withdrawn
Application number
GB0908968A
Other versions
GB0908968D0 (en
Inventor
Chris Reidar Frolich Braathen
Fredrik Haga
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
OSO Hotwater AS
Original Assignee
OSO Hotwater AS
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 OSO Hotwater AS filed Critical OSO Hotwater AS
Priority to GB0908968A priority Critical patent/GB2458826A/en
Publication of GB0908968D0 publication Critical patent/GB0908968D0/en
Publication of GB2458826A publication Critical patent/GB2458826A/en
Priority to NO20093208A priority patent/NO20093208L/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
    • F24D3/1008—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system expansion tanks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/18—Water-storage heaters
    • F24H1/188—Water-storage heaters with means for compensating water expansion

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Details Of Fluid Heaters (AREA)

Abstract

A water heater comprises a main water tank 10 and an expansion tank 15 with fluid connection to the main tank for maintaining a substantially constant water pressure. The expansion tank comprises gas, such as air, and is arranged on top of or under the main tank. Preferably, the main tank is cylindrical and the expansion tank is arranged within the longitudinal projection of the main tank. The water heater may include two expansion tanks. Preferably, the expansion tank comprises an expansion bladder 18 arranged within a fluid tight expansion vessel 16, where the expansion bladder comprises an inlet neck with an outer side which seals against an inner wall of the expansion vessel. The main tank may accommodate a volume of 100-300 litres. The water heater may include a cover 24, 26, with the expansion tank being located between the main tank and the cover. Preferably, the expansion tank curves about a mixing valve 14 arranged on top of the main tank.

Description

Water heater The present invention relates to a water heater according to the introduction of claim 1.
Background
When the water in water heaters is heated, it expands. This change of volume must be accounted for so that damage of the tank due to pressure build up is avoided.
To do this, it is known to connect an expansion tank with fluid connection to the main tank. The expansion tank contains gas, such as air, which is compressible. Thus, when the water in the main tank of the water heater expands, the gas in the expansion tank is compressed and the pressure in the main tank (and the expansion tank) remains substantially the same, provided that the gas volume is sufficiently large. It is known in the art to arrange an expansion tank for instance on a wall beside the water heater. The expansion tank is then connected to the main tank with a pipe.
Another solution involves filling the main tank only to a certain level, and leave air in the upper space of the tank. A similar solution is described in US 6,041,742. This publication describes a flexible air bladder arranged in the main tank. The bladder changes size according to the pressure inside the tank.
This is, however, not an optimal solution since a part of the main tank will be used for accommodating the air volume. The available volume of the main tank is then not used for heated water. The result of this is that the volume of the tank must be unnecessary large in order to make room for the desired amount of water.
Patent application GB 2 375 594 describes a water heater with a cold water tank arranged above the main hot water tank. The cold water tank is adapted to accommodate both water and air, and further to receive water from the hot water tank when the pressure inside this becomes to large. The water in the hot water tank is provided from the cold water tank through a separate pipe (14). This is, however, an unnecessary costly and space-requiring solution.
The object of the present invention is to provide a water heater that fulfils the requirement of a means to account for the expansion of heated water. A further object of the invention is to provide such a water heater with a uniform appearance and which requires a minimum of effort when installing.
The invention The invention is declared in the characterizing part of claim 1. Further details and advantageous embodiments appear from the independent claims.
According to the invention, a water heater comprises a main tank for accommodation of water and an expansion tank with fluid connection to the main tank for retaining a substantially constant water pressure. The expansion tank comprises gas, such as air, and is arranged on top of or under the main tank.
Preferably, the main tank has a substantially cylindrical shape and the expansion tank is arranged substantially within the cylindrical longitudinal projection of the main tank or an outer cover. In this way, the assembly of main tank and expansion tank does not require more area than the main tank itself does, or the outer cover, respectively.
In an advantageous embodiment, the water heater comprises two expansion tanks. This results in a large combined volume of the expansion tanks while maintaining a limited height of the overall assembly.
In another embodiment, the expansion tank comprises an expansion bladder which is arranged in a fluid tight expansion vessel. In such an embodiment the expansion bladder can advantageously comprise an inlet neck which with its outer side sealing against an inner wall of the expansion vessel.
The main tank can preferably be in the size range of 100-300 litres.
Preferably the water heater comprises a cover, wherein the expansion tank is arranged between the main tank and the cover. Thus it will provide protection for the expansion tank and a mixing valve, as well as lend a uniform appearance to the overall water heater assembly.
Furthermore the expansion tank can be arranged with a curvature about a vertical centre axis of the main tank. Preferably, a mixing valve is arranged on top of the main tank, and the expansion tank curves at least partially about the mixing valve.
Example of embodiment In the following some examples of various embodiments according to the invention are given with reference to the drawings, in which: Fig. 1 is a cross section view of a principle sketch of a water heater according to the invention, comprising an expansion tank arranged above the main tank; Fig. 2 is a perspective view of a lower part of a water heater according to the invention, with an expansion tank arranged under the main tank; Fig. 3 is a perspective view of the upper part of a water heater, having two expansion tanks arranged on top of the main tank; Fig. 4 is a top section view of the top of the main tank and an expansion tank with a curvature about a centrally arranged mixing valve; Fig. 5 is a perspective view of an expansion vessel that surrounds an expansion bladder of a water heater according to the invention; Fig. 6 is a cross section view showing the expansion vessel of Fig. 5, the expansion bladder being arranged inside the expansion vessel; Fig. 7 is a perspective view of an expansion vessel; Fig. 8 is a cross section view of the expansion vessel of Fig. 7, with an expansion bladder arranged inside; Fig. 9 is a cross section view of an embodiment for fixing the expansion bladder to the expansion vessel; and Fig. 10 shows yet another embodiment of fixation of the expansion bladder to the expansion vessel.
S
Fig. I shows a principle sketch of a water heater according to the invention.
The water heater has a main tank 10 which is arranged within an outer cover 12. On top of the main tank 10 there is arranged a mixing valve 14 for supply of cold water and letting out heated water from the main tank 10. On top of the main tank 10 there is arranged an expansion tank 15. The water heater also comprises a top cover 24 and a bottom cover 26. In Fig. I the expansion tank is covered by the top cover 24.
Fig. 2 shows the lower part of a water heater according to the invention. In this alternative embodiment, an expansion tank 15 is arranged below the main tank 10, and is covered by the bottom cover 26.
Fig. 3 shows the upper part of water heater with the top cover 24 removed. In this preferred embodiment, two expansion tanks 15 are arranged on top of the main tank 10. The two expansion tanks 15 are connected to the main tank 10 through pipes 17. Thus, the two expansion tanks 15 fulfil the same purpose as only one expansion tank would. The main reason for arranging two in stead of one is to increase the effective expansion tank volume, while at the same time avoiding an extensive vertical dimension of the expansion tanks, influencing the vertical dimension of the entire water heater assembly.
Fig. 4 is a top view showing an expansion tank 15 arranged on top of the main tank 10. In this embodiment the expansion tank 15 is shaped to fit within the vertical projection of the cylindrical shape of the outer cover 12. Also, one sees that the expansion tank has a curvature about the centrally arranged mixing valve 14.
Fig. 5 is a perspective view of a particular embodiment of the expansion tank 15. Here the expansion tank 15 comprises an expansion vessel 16 within which there is arranged an expansion bladder 18, as shown with the cross section view of Fig. 6. The expansion vessel 16 has a curved form and almost forms a completed circle. Within the curved form there is space for the mixing valve 14 which is connected to the main tank 10.
The inner space of the expansion bladder 18 is in fluid connection with the inner space of the main tank 10. The volume or space between the expansion bladder 18 and the expansion vessel 16 is filled with air. When the volume of the water in the main tank 10 expands, a small part of the water will flow into the expansion bladder 18. The expansion bladder 18 will then expand correspondingly. As the expansion vessel 16 advantageously is fluid tight, the expansion of the expansion bladder 18 will compress the air inside the expansion vessel 16. However, the pressure of the gas will not change dramatically with a small decrease of volume, as the air is compressible. Vice versa, when water flows back towards the main tank 10 from the expansion bladder 18, its volume is reduced. Due to the compressibility of the air, the pressure will remain in the expansion vessel 16 and hence also in the main tank 10.
In Fig. 5 and Fig. 6 are also shown a connection 20 with which a (not shown) hydraulic connection between the water in the main tank 10 and the water in the expansion bladder 18 can be provided. There is also shown an air valve 22 with which air can be supplied to and let out from the air volume in the expansion vessel 16. This air volume exists between the expansion bladder 18 and the inner walls of the expansion vessel 16.
The expansion vessel 16 shown in Fig. 5 and Fig. 6 makes about 7/8 of a complete circle. This is suitable to be arranged below the main tank 10 in such a way that it curls about the vertical centre axis of the water heater. The opening constituted by the missing 1/8 part of the circle makes suitable space for a security valve (not shown) of the water heater, which can be placed in the lower part of the main tank 10.
In another advantageous embodiment the expansion vessel 16 has the shape of a complete circle and is arranged above the main tank 10 (such as indicated in Fig. 1). It can then be arranged as a donut about the vertical centre axis of the water heater as well as the mixing valve 14. The connection 20 and the air valve 22 are then arranged in the side of the expansion bladder 18 and the expansion vessel 16, respectively (not shown).
Arranging the expansion tank 15 above or under the main tank 10 exhibits an advantage in that the overall assembly of the water heater will not require unnecessary much area of a room, such as a bathroom. Furthermore, especially if it is arranged on top of the main tank 10, it is easily inspected and repaired, if necessary. In addition it will render the water heater a uniform and "clean" shape, making it as little disturbing as possible to a domestic living environment.
Arranging the expansion tank 15 above the main tank 10, possibly with a curvature about the mixing valve 14, will provide for a certain protection of the mixing valve 14 (and any control wheel on this) against impacts. During transport of the water heater and also during installation or temporarily storage at a construction site, the water heater may be exposed to rough treatment.
The top cover 24 will give an additional protection of both the expansion tank and the mixing valve 14. The top cover 24 and/or the bottom cover 26 will also make the water heater easy to clean, as it has smooth outer surfaces.
Fig. 7 and Fig. 8 show another shape of an expansion tank 15 having an expansion bladder 18 within an expansion vessel 16. This expansion tank 15 is less curved than the one shown in Fig. 5 and Fig. 6.
Fig. 9 shows the connection 20 and a part of the expansion bladder 18 and the expansion vessel 16 in a cross section view. Here one can see how the expansion bladder 18 is arranged in an opening of the expansion vessel 16.
Fig. 10 shows an additional embodiment of the connection 20, in which the expansion bladder 18 is arranged in the opening of the expansion vessel 16 in such way that it seals outwardly with its inlet neck. The expansion bladder 18 is made of rubber or another flexible material. Such a material is suitable for making a gasket or seal against the opening in the expansion vessel 16, in such a way that a good sealing between the outer surface of the expansion bladder 18 in the area of the connection 20 and the inner surface of the expansion vessel 16 in the same area is provided. This sealing can advantageously be adapted in such a way that the pressure in the expansion bladder 18 contributes in forcing the inlet neck of the expansion bladder 18 outwardly against the inner surface of the expansion vessel, and in this way contribute to a good sealing between the expansion bladder 18 and the expansion vessel 16 in the area of the connection 20.
In the embodiments described with reference to Figs. 5-10, the expansion vessel 16 is tight, such that it maintains the gas or air in the space between the walls of the expansion vessel 16 and the expansion bladder 18. The gas pressure in this space will provide of a maintained pressure in the main tank 10 within a given pressure range. If the expansion vessel is not air tight, but for example has perforated walls, the counter pressure in the expansion bladder can be provided by means of the elasticity and the mechanical strength in the expansion bladder. The expansion bladder can be adapted in such way that it with increasing pressure will expand in such a way that the resistance against further expansion increases. That is, the more it expands the higher pressure increase it will take to make a further expansion. The expansion vessel can in this embodiment be arranged in such a way that it functions as a barrier against further expansion when the expansion bladder as achieved a predetermined volume. This volume will be achieved when the expansion bladder bears against the inner walls of the expansion vessel.
One can also imagine a solution in which the expansion bladder, when it has expanded in such way that it bears against the inner walls of the expansion vessel, will expand further together with the expansion vessel. The walls of the expansion vessel will then provide a counter pressure and ensure that the expansion bladder does not expand excessively.
In contrast to the bladder and vessel embodiments above, one can also provide a solution with gas or air in the expansion bladder 18 and water in the space between the expansion bladder 18 and the expansion vessel 16. This requires that the expansion vessel 16 is tight. It will then be a fluid connection between the water in this space and the water in the main tank 10. When the water in the main tank expands, some of it will flow into the space between the expansion bladder 18 and the expansion vessel 16, and the expansion bladder will become smaller. Oppositely, the gas-filled expansion bladder will expand as water flows back towards the main tank 10.

Claims (10)

  1. Claims 1. Water heater comprising a main tank (10) for accommodation of water and an expansion tank (15) with fluid connection to the main tank (10) for retaining a substantially constant water pressure, which expansion tank (15) comprises gas, such as air, characterized in that said expansion tank (15) is arranged on top of or under the main tank (10).
  2. 2. Water heater according to claim 1, characterized in that the main tank (10) has a substantially cylindrical shape and that the expansion tank (15) is arranged substantially within the cylindrical longitudinal projection of the main tank (10) or an outer cover (12) of the water heater.
  3. 3. Water heater according claim I or 2, characterized in that it comprises two expansion tanks (15).
  4. 4. Water heater according to claim 1-3, characterized in that the expansion tank (1 5) comprises an expansion bladder (18), and that the expansion bladder (18) is arranged in a fluid tight expansion vessel (16).
  5. 5. Water heater according to any one of the claim 4, characterized in that the expansion bladder (18) comprises an inlet neck which with its outer side seals against an inner wall of the expansion vessel (16).
  6. 6. Water heater according to any one of the preceding claims, characterized in that the main tank (10) accommodates 100-300 litres.
  7. 7. Water heater according to any one of the preceding claims, characterized in that it comprises a cover (24, 26), and that the expansion tank (10) is arranged between the main tank (10) and the cover (24, 26).
  8. 8. Water heater according to any one of the preceding claims, characterized in that the expansion tank (15) is arranged with a curvature about a vertical centre axis of the main tank (10).
  9. 9. Water heater according to any one of the preceding claims, characterized in that a mixing valve (14) is arranged on top of the main tank (10), and that the expansion tank (15) curves at least partially about the mixing valve (14).
  10. 10. A water heater as substantially hereinbefore described with reference to Figures Ito 10.
GB0908968A 2009-05-26 2009-05-26 Water heater comprising an expansion tank Withdrawn GB2458826A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB0908968A GB2458826A (en) 2009-05-26 2009-05-26 Water heater comprising an expansion tank
NO20093208A NO20093208L (en) 2009-05-26 2009-10-23 Water heater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0908968A GB2458826A (en) 2009-05-26 2009-05-26 Water heater comprising an expansion tank

Publications (2)

Publication Number Publication Date
GB0908968D0 GB0908968D0 (en) 2009-07-01
GB2458826A true GB2458826A (en) 2009-10-07

Family

ID=40862936

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0908968A Withdrawn GB2458826A (en) 2009-05-26 2009-05-26 Water heater comprising an expansion tank

Country Status (2)

Country Link
GB (1) GB2458826A (en)
NO (1) NO20093208L (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20120790A1 (en) * 2012-09-14 2014-03-15 Global Water Solutions Ltd EQUIPMENT FOR PRE-ASSEMBLED SUPPLEMENTATION FOR WATER PUMPING SYSTEM.
US9234678B1 (en) 2011-09-27 2016-01-12 Rheem Manufacturing Company Stackable water heater apparatus
US20160178238A1 (en) * 2014-12-22 2016-06-23 Yi-Huang Chen Feed water heater with recovery device for swelling water
US20220252301A1 (en) * 2021-02-09 2022-08-11 Nexwater Inc. Inflated water storage device of heater

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1248178A (en) * 1969-05-05 1971-09-29 Vaillant Joh Kg Forced-circulation water heater for closed-circuit heating systems
US3891124A (en) * 1974-08-16 1975-06-24 Emerson Electric Co Means for storing and dispensing heated liquid with expansion chamber module and system therefor
DE3013877A1 (en) * 1980-04-10 1981-10-22 Wilhelm Dipl.-Ing. 6149 Rimbach Hertel Large vertical hot water storage tank - is pressurised to enable water to be stored at temp. above 100 centigrade
JPS58136940A (en) * 1982-02-10 1983-08-15 Matsushita Electric Ind Co Ltd Storing type hot-water supplying device
GB2270746A (en) * 1992-09-22 1994-03-23 Gledhill Water Storage Hot water storage installation
GB2285854A (en) * 1993-12-16 1995-07-26 Zip Heaters Connection tubes.
GB2286238A (en) * 1993-11-23 1995-08-09 Hanson Graville George Central heating:expansion tank
US5690061A (en) * 1996-02-26 1997-11-25 Lopez; Juan A. Water heater with expansion tank
US6041742A (en) * 1999-03-03 2000-03-28 Drake; Lawrence V. Fluid heating and pumping apparatus
GB2402994A (en) * 2003-06-18 2004-12-22 George Hanson-Graville Expansion chamber with flexible membrane
JP2005147538A (en) * 2003-11-17 2005-06-09 Matsushita Electric Ind Co Ltd Hot water storage type water heater
WO2007024821A1 (en) * 2005-08-24 2007-03-01 Emerson Electric Co. Hot water dispenser

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1248178A (en) * 1969-05-05 1971-09-29 Vaillant Joh Kg Forced-circulation water heater for closed-circuit heating systems
US3891124A (en) * 1974-08-16 1975-06-24 Emerson Electric Co Means for storing and dispensing heated liquid with expansion chamber module and system therefor
DE3013877A1 (en) * 1980-04-10 1981-10-22 Wilhelm Dipl.-Ing. 6149 Rimbach Hertel Large vertical hot water storage tank - is pressurised to enable water to be stored at temp. above 100 centigrade
JPS58136940A (en) * 1982-02-10 1983-08-15 Matsushita Electric Ind Co Ltd Storing type hot-water supplying device
GB2270746A (en) * 1992-09-22 1994-03-23 Gledhill Water Storage Hot water storage installation
GB2286238A (en) * 1993-11-23 1995-08-09 Hanson Graville George Central heating:expansion tank
GB2285854A (en) * 1993-12-16 1995-07-26 Zip Heaters Connection tubes.
US5690061A (en) * 1996-02-26 1997-11-25 Lopez; Juan A. Water heater with expansion tank
US6041742A (en) * 1999-03-03 2000-03-28 Drake; Lawrence V. Fluid heating and pumping apparatus
GB2402994A (en) * 2003-06-18 2004-12-22 George Hanson-Graville Expansion chamber with flexible membrane
JP2005147538A (en) * 2003-11-17 2005-06-09 Matsushita Electric Ind Co Ltd Hot water storage type water heater
WO2007024821A1 (en) * 2005-08-24 2007-03-01 Emerson Electric Co. Hot water dispenser

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9234678B1 (en) 2011-09-27 2016-01-12 Rheem Manufacturing Company Stackable water heater apparatus
US9835359B1 (en) 2011-09-27 2017-12-05 Rheem Manufacturing Company Stackable water heater apparatus
ITTO20120790A1 (en) * 2012-09-14 2014-03-15 Global Water Solutions Ltd EQUIPMENT FOR PRE-ASSEMBLED SUPPLEMENTATION FOR WATER PUMPING SYSTEM.
US20160178238A1 (en) * 2014-12-22 2016-06-23 Yi-Huang Chen Feed water heater with recovery device for swelling water
US9797625B2 (en) * 2014-12-22 2017-10-24 Yi-Huang Chen Feed water heater with recovery device for swelling water
US20220252301A1 (en) * 2021-02-09 2022-08-11 Nexwater Inc. Inflated water storage device of heater
US11725848B2 (en) * 2021-02-09 2023-08-15 Nexwater Inc. Inflated water storage device of heater

Also Published As

Publication number Publication date
NO20093208L (en) 2010-11-29
GB0908968D0 (en) 2009-07-01

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