CN102494404B - Condensing efficient gas water heater - Google Patents
Condensing efficient gas water heater Download PDFInfo
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- CN102494404B CN102494404B CN2011103988404A CN201110398840A CN102494404B CN 102494404 B CN102494404 B CN 102494404B CN 2011103988404 A CN2011103988404 A CN 2011103988404A CN 201110398840 A CN201110398840 A CN 201110398840A CN 102494404 B CN102494404 B CN 102494404B
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- insulation layer
- thermal insulation
- heat
- water heater
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- 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
- F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
- F24H1/24—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers
- F24H1/26—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body
- F24H1/28—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body including one or more furnace or fire tubes
- F24H1/287—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body including one or more furnace or fire tubes with the fire tubes arranged in line with the combustion chamber
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- 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
- F24H8/00—Fluid heaters characterised by means for extracting latent heat from flue gases by means of condensation
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- 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
- F24H9/00—Details
- F24H9/0005—Details for water heaters
- F24H9/001—Guiding means
- F24H9/0026—Guiding means in combustion gas channels
- F24H9/0031—Guiding means in combustion gas channels with means for changing or adapting the path of the flue gas
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
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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)
- Incineration Of Waste (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a condensing efficient gas water heater, which comprises an inner container, a combustor, a smoke exhausting hood, a heat exchange smoke tube, a heat-preserving layer and a shell, wherein the combustor is arranged at the lower side of the inner container; the smoke exhausting hood is arranged at the outer side of the inner container and has a smoke exhausting gap with the inner container; the heat exchange smoke tube longitudinally runs through the inner container; the heat-preserving layer and the shell are coated at the outer side of the smoke exhausting hood; the smoke exhausting hood is provided with a smoke exhausting opening communicated with atmosphere; the smoke exhausting hood particularly comprises a gas distributing hood at a top, a condensing hood positioned at the lower side of the gas distributing hood and further connected with the gas distributing hood, and a reflux hood arranged at the lower part of the heat-preserving layer; a reflux cavity is formed between the reflux hood and the condensing hood; the reflux cavity is respectively communicated with the smoke exhausting opening and a condensing cavity; and the outer wall of the condensing hood is provided with a first heat insulating layer. According to the condensing efficient gas water heater, by arranging the first heat insulating layer on the outer wall of the condensing hood, the first heat insulating layer can be used for reflecting the heat of fume, so that the heat of the fume is not leaked outwards; the first heat insulating layer is verified to be capable of decreasing the temperature at the smoke exhausting opening by 2-5 DEG C; and the heat efficiency is further improved.
Description
Technical field
The present invention relates to the gas heater technical field, particularly a kind of Congealed high-efficient gas water heater.
Background technology
Along with scientific and technical development, the improvement day by day of people's living standard, the demand of hot water in people's daily life increases greatly, and water heater, gas heater are widely used by people, and especially gas displacement type water heater has been come into huge numbers of families gradually.
In the time of common gas water heater working, can give off a large amount of flue gases, temperature is up to 180 ℃, common water heater can't utilize this part heat, is slatterned in vain, simultaneously, in process in discharge up to 180 ℃ of high-temperature flue gas, heat transmission makes fuselage obviously hot, with hand, touches, and can't on fuselage, stop.And the key of condensation technology is the high-efficiency condensation heat exchanger, the cold water pipe that advances of water heater is close to condensing heat exchanger, when the high-temperature flue gas of discharge passes through condensing heat exchanger, the overwhelming majority heats heat exchanger that is condensed absorbs, in order to the cold water in the preheating water inlet pipe, be equivalent to carry out once heating in advance before general gas water heater heating cold water, it should be noted that the heat in order to preheating cold water is not to obtain by combustion gas, but utilized the heat in the irretrievable flue gas of script, thereby reach energy-saving effect, have environmental protection concurrently, the flue-gas temperature of so final discharge only has 60 ℃ of left and right, while being delivered to fuselage again, the existing institute of temperature reduces, with hand, touch, only has the sensation of temperature slightly, hand can rest on fuselage fully.But the current gas heater thermal efficiency is told somebody what one's real intentions are.
Therefore, how to improve heat exchange efficiency, become those skilled in the art's important technological problems urgently to be resolved hurrily.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of Congealed high-efficient gas water heater, to improve heat exchange efficiency.
For achieving the above object, the invention provides following technical scheme:
A kind of Congealed high-efficient gas water heater, comprise inner bag, be arranged at described inner bag downside burner, be arranged at the described inner bag outside and there is the enclosure in smoke evacuation gap, heat-insulation layer and the shell that vertically runs through the heat exchange smoke pipe of described inner bag and be coated on the described enclosure outside with described inner bag, described enclosure has the exhaust opening communicated with atmosphere, and described enclosure specifically comprises:
Be positioned at minute gas hood at top, between the top of described minute gas hood and described inner bag, form and shunt chamber;
Be positioned at described minute gas hood downside, and the condensing cover be connected with described minute gas hood, forming condensation chamber between the sidewall of described condensing cover and described inner bag, described condensation chamber is connected with described shunting chamber;
Be arranged at the back cover of described heat-insulation layer bottom, between described back cover and described condensing cover, form back cavity, described back cavity is connected with described exhaust opening and described condensation chamber respectively, and the outer wall of described condensing cover is provided with the first thermal insulation layer.
Preferably, in above-mentioned Congealed high-efficient gas water heater, described the first thermal insulation layer is heat insulation aluminium foil layer or heat insulation tinfoil paper layer.
Preferably, in above-mentioned Congealed high-efficient gas water heater, described the first thermal insulation layer is at least two-layer, and the minute surface of described first thermal insulation layer of internal layer is towards described condensing cover inboard, and the minute surface of outer field described the first thermal insulation layer is towards the described condensing cover outside.
Preferably, in above-mentioned Congealed high-efficient gas water heater, described the first thermal insulation layer is three layers, and the minute surface of described first thermal insulation layer in intermediate layer is towards described condensing cover inboard.
Preferably, in above-mentioned Congealed high-efficient gas water heater, the inwall of described back cover is provided with the second thermal insulation layer.
Preferably, in above-mentioned Congealed high-efficient gas water heater, described the second thermal insulation layer is heat insulation aluminium foil layer or heat insulation tinfoil paper layer.
Preferably, in above-mentioned Congealed high-efficient gas water heater, described the second thermal insulation layer is at least two-layer, and the minute surface of described second thermal insulation layer of internal layer is towards the described back cover outside, and the minute surface of outer field described the second thermal insulation layer is towards described back cover inboard.
Preferably, in above-mentioned Congealed high-efficient gas water heater, described the second thermal insulation layer is three layers, and the minute surface of described second thermal insulation layer in intermediate layer is towards the described back cover outside.
Preferably, in above-mentioned Congealed high-efficient gas water heater, described the first thermal insulation layer (8) is 11-14mm by described exhaust opening place to the cross-sectional width of the described condensation chamber of downward-extension 300～400mm.
Preferably, in above-mentioned Congealed high-efficient gas water heater, the cross-sectional width of described condensation chamber is 11-14mm, and described exhaust opening is positioned at middle part or the top of described inner bag.
From above-mentioned technical scheme, can find out, Congealed high-efficient gas water heater provided by the invention, by enclosure being designed to comprise a minute gas hood, condensing cover and back cover, slowed down the flow velocity of flue gas, improve the time of staying of flue gas in Congealed high-efficient gas water heater, then improved the thermal efficiency.And the present invention arranges the first thermal insulation layer by the outer wall at condensing cover, this first thermal insulation layer can be used in the heat of reflection flue gas, makes flue gas heat not leak, and according to checking, the first thermal insulation layer can make exhaust opening temperature decline 2-5 ℃, has further improved the thermal efficiency.
The accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The structural representation of the Congealed high-efficient gas water heater that Fig. 1 provides for the embodiment of the present invention;
The partial enlarged drawing that Fig. 2 is I in Fig. 1.
The specific embodiment
The invention discloses a kind of Congealed high-efficient gas water heater, to improve heat exchange efficiency.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making under the creative work prerequisite the every other embodiment obtained, belong to the scope of protection of the invention.
Refer to Fig. 1 and Fig. 2, the structural representation of the Congealed high-efficient gas water heater that Fig. 1 provides for the embodiment of the present invention; The partial enlarged drawing that Fig. 2 is I in Fig. 1.
The Congealed high-efficient gas water heater that the embodiment of the present invention provides, comprise inner bag 9, burner 6, enclosure, heat exchange smoke pipe, heat-insulation layer 10 and shell 11.Wherein, inner bag 9 is for holding cold water, and burner 6 is arranged at the downside of inner bag 9, for the cold water in inner bag 9, is heated.Enclosure is arranged at the outside of inner bag 9 and has the smoke evacuation gap with inner bag 9, and the flue gas that the heat exchange smoke pipe is discharged is drained by the smoke evacuation gap.The heat exchange smoke pipe vertically runs through inner bag 9, and top and the bottom of inner bag 9 are passed respectively in two ends.Heat-insulation layer 10 and shell 11 are coated on the outside of enclosure, and enclosure has the exhaust opening 4 communicated with atmosphere.
The disclosed enclosure of above-described embodiment can specifically comprise minute gas hood 1, condensing cover 2 and back cover 5.Wherein, minute gas hood 1 is positioned at the top of inner bag 9, forms the shunting chamber between the top of minute gas hood 1 and inner bag 9, and the flue gas flowed out along heat exchange smoke pipe top is shunted by a minute gas hood 1, and flows downward along the shunting chamber.Condensing cover 2 is positioned at the downside of minute gas hood 1, and is connected with a minute gas hood 1, forms condensation chamber 3 between the sidewall of condensing cover 2 and inner bag 9, and condensation chamber 3 is connected with the shunting chamber.Back cover 5 is arranged at the bottom of heat-insulation layer 10, and the outer wall of condensing cover 2 is provided with the first thermal insulation layer 8, forms back cavity 7 between back cover 5 and condensing cover 2, and back cavity 7 is connected with exhaust opening 4 and condensation chamber 3 respectively.The present invention can guarantee the length long enough of condensation chamber 3 by back cover 5 is set, improve heat exchange efficiency, flue gas is interior after last heat exchange at condensation chamber 3, by forming back cavity 7 between back cover 5 and condensing cover 2, upwards flows, until drain by exhaust opening 4.
Congealed high-efficient gas water heater provided by the invention, by enclosure being designed to comprise minute gas hood 1, condensing cover 2 and back cover 5, slowed down the flow velocity of flue gas, improved the time of staying of flue gas in Congealed high-efficient gas water heater, then improved the thermal efficiency.And the present invention arranges the first thermal insulation layer 8 by the outer wall at condensing cover 2, this first thermal insulation layer 8 can be used in the heat of reflection flue gas, makes flue gas heat not leak, according to checking, the first thermal insulation layer 8 can make exhaust opening temperature decline 2-5 ℃, has further improved the thermal efficiency.
In the present embodiment, by the Design of length of the first thermal insulation layer 8, be to downward-extension 300～400mm usually by described exhaust opening place.
Divide on gas hood 1 and there is the projection of extending to the heat exchange smoke pipe, at first heat energy and high-temperature flue gas that burner 6 discharges carry out heat exchange for the first time by the bottom of inner bag 9, then carry out heat exchange for the second time by the heat exchange smoke pipe, the waste heat exchanged by second heat and high-temperature flue gas are after heat exchange smoke pipe upper port is hampered by the projection of minute gas hood 1, by a minute gas hood 1, reverse downwards, again carry out heat exchange with inner bag 9 outer walls in condensation chamber 3, waste heat and high-temperature flue gas are fully absorbed, flue-gas temperature is down to below the steam dew-point temperature, now will produce certain condensed water.Condensed water will flow to along the inside and outside wall of condensation chamber 3 in the water accumulating disc of bottom.
In the present embodiment, the first thermal insulation layer 8 can be heat insulation aluminium foil layer or heat insulation tinfoil paper layer, and the first thermal insulation layer 8 is at least two-layer, and the minute surface of the first thermal insulation layer 8 of internal layer is towards condensing cover 2 inboards, and the minute surface of outer field the first thermal insulation layer 8 is towards condensing cover 2 outsides.
The first thermal insulation layer 8 also can be three layers, and the minute surface of the first thermal insulation layer 8 of internal layer is towards condensing cover 2 inboards, and the minute surface of first thermal insulation layer 8 in intermediate layer is towards condensing cover 2 inboards, and the minute surface of outer field the first thermal insulation layer 8 is towards condensing cover 2 outsides.
In order further to improve heat exchange efficiency, be provided with the second thermal insulation layer (not shown) on the inwall of the back cover 5 that the embodiment of the present invention provides.This second thermal insulation layer and first is can thermal insulation layer 8 identical, can be used in equally the heat of reflection flue gas, makes flue gas heat not leak, and has further improved the thermal efficiency.
In the present embodiment, the second thermal insulation layer is heat insulation aluminium foil layer or heat insulation tinfoil paper layer, and the second thermal insulation layer is at least two-layer, and the minute surface of the second thermal insulation layer of internal layer is towards back cover 5 outsides, and the minute surface of outer field the second thermal insulation layer is towards back cover 5 inboards.
The second thermal insulation layer also can be three layers, and the minute surface of the second thermal insulation layer of internal layer is towards back cover 5 outsides, and the minute surface of second thermal insulation layer in intermediate layer is towards back cover 5 outsides, and the minute surface of outer field the second thermal insulation layer is towards back cover 5 inboards.
The cross-sectional width of condensation chamber is 11-14mm, in one embodiment of the present invention, is specially 12mm.Because the present invention has reduced the width of condensation chamber annular space, so can make exhaust opening 4 be positioned at middle part or the top of inner bag 9, also can not make flow of flue gas not smooth.In the present embodiment, arranging of exhaust opening 4 is highly 50%～95% of inner bag 9 height.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment that between each embodiment, identical similar part is mutually referring to getting final product.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the present invention.Multiple modification to these embodiment will be apparent for those skilled in the art, and General Principle as defined herein can be in the situation that do not break away from the spirit or scope of the present invention, realization in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a Congealed high-efficient gas water heater, comprise inner bag (9), be arranged at the burner (6) of described inner bag (9) downside, heat-insulation layer (10) and the shell (11) that is arranged at described inner bag (9) outside and there is the enclosure in smoke evacuation gap, vertically run through the heat exchange smoke pipe of described inner bag (9) and be coated on the described enclosure outside with described inner bag (9), described enclosure has the exhaust opening communicated with atmosphere, it is characterized in that, described enclosure specifically comprises:
Be positioned at minute gas hood (1) at top, between the top of described minute gas hood (1) and described inner bag (9), form and shunt chamber;
Be positioned at described minute gas hood (1) downside, and with the described minute condensing cover (2) that be connected of gas hood (1), form condensation chamber (3) between the sidewall of described condensing cover (2) and described inner bag (9), described condensation chamber (3) is connected with described shunting chamber;
Be arranged at the back cover (5) of described heat-insulation layer (10) bottom, form back cavity (7) between described back cover (5) and described condensing cover (2), described back cavity (7) is connected with described exhaust opening and described condensation chamber (3) respectively, and the outer wall of described condensing cover (2) is provided with the first thermal insulation layer (8) for reflecting flue gas heat, making flue gas heat not leak.
2. Congealed high-efficient gas water heater as claimed in claim 1, is characterized in that, described the first thermal insulation layer (8) is heat insulation aluminium foil layer or heat insulation tinfoil paper layer.
3. Congealed high-efficient gas water heater as claimed in claim 2, it is characterized in that, described the first thermal insulation layer (8) is at least two-layer, the minute surface of described first thermal insulation layer (8) of internal layer is towards described condensing cover (2) inboard, and the minute surface of outer field described the first thermal insulation layer (8) is towards described condensing cover (2) outside.
4. Congealed high-efficient gas water heater as claimed in claim 3, is characterized in that, described the first thermal insulation layer (8) is three layers, and the minute surface of described first thermal insulation layer (8) in intermediate layer is towards described condensing cover (2) inboard.
5. as the described Congealed high-efficient gas water heater of claim 1-3 any one, it is characterized in that, the inwall of described back cover (5) is provided with the second thermal insulation layer.
6. Congealed high-efficient gas water heater as claimed in claim 5, is characterized in that, described the second thermal insulation layer is heat insulation aluminium foil layer or heat insulation tinfoil paper layer.
7. Congealed high-efficient gas water heater as claimed in claim 6, it is characterized in that, described the second thermal insulation layer is at least two-layer, and the minute surface of described second thermal insulation layer of internal layer is towards described back cover (5) outside, and the minute surface of outer field described the second thermal insulation layer is towards described back cover (5) inboard.
8. Congealed high-efficient gas water heater as claimed in claim 7, is characterized in that, described the second thermal insulation layer is three layers, and the minute surface of described second thermal insulation layer in intermediate layer is towards described back cover (5) outside.
9. as the described Congealed high-efficient gas water heater of claim 1-3 any one, it is characterized in that, described the first thermal insulation layer (8) by described exhaust opening place to downward-extension 300～400mm.
10. Congealed high-efficient gas water heater as claimed in claim 9, is characterized in that, the cross-sectional width of described condensation chamber is 11-14mm, and described exhaust opening is positioned at middle part or the top of described inner bag (9).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103988404A CN102494404B (en) | 2011-12-05 | 2011-12-05 | Condensing efficient gas water heater |
| PCT/CN2011/083740 WO2013082797A1 (en) | 2011-12-05 | 2011-12-09 | High efficiency condensing gas water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103988404A CN102494404B (en) | 2011-12-05 | 2011-12-05 | Condensing efficient gas water heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102494404A CN102494404A (en) | 2012-06-13 |
| CN102494404B true CN102494404B (en) | 2013-12-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103988404A Active CN102494404B (en) | 2011-12-05 | 2011-12-05 | Condensing efficient gas water heater |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102494404B (en) |
| WO (1) | WO2013082797A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103438563A (en) * | 2013-08-31 | 2013-12-11 | 苏州赛斯德工程设备有限公司 | Total encapsulation type gas water heater |
| CN116412539A (en) * | 2021-12-29 | 2023-07-11 | 艾欧史密斯(中国)热水器有限公司 | Condensing heat exchanger and hot water/heating equipment thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201078722Y (en) * | 2007-11-13 | 2008-06-25 | 景洪 | Condensing type high-efficiency gas positive displacement water heater |
| CN201508017U (en) * | 2009-05-18 | 2010-06-16 | 赵庆义 | Improved gas water heater |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4412714A1 (en) * | 1994-04-13 | 1995-10-19 | Buderus Heiztechnik Gmbh | Water geyser with catalytic burner unit(s) in water chamber |
| US6544618B1 (en) * | 1999-05-06 | 2003-04-08 | Cabot Corporation | Thermally reflective layer-porous metal oxide film insulation composite |
| CN2606302Y (en) * | 2003-01-23 | 2004-03-10 | 艾欧史密斯(中国)热水器有限公司 | Multi exhaust water heater |
| JP4671897B2 (en) * | 2006-03-30 | 2011-04-20 | 日立アプライアンス株式会社 | Vacuum insulation, hot water supply equipment and electric water heater using vacuum insulation |
| CN201116776Y (en) * | 2007-08-17 | 2008-09-17 | 上海海事大学 | Vacuum heat-insulation plate used for water heater |
| CN101149186B (en) * | 2007-11-13 | 2010-05-26 | 景洪 | Condensing type highly effective gas displacement type water heater |
| WO2010121287A1 (en) * | 2009-04-21 | 2010-10-28 | Rheem Australia Pty Limited | Improvements in water heaters |
-
2011
- 2011-12-05 CN CN2011103988404A patent/CN102494404B/en active Active
- 2011-12-09 WO PCT/CN2011/083740 patent/WO2013082797A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201078722Y (en) * | 2007-11-13 | 2008-06-25 | 景洪 | Condensing type high-efficiency gas positive displacement water heater |
| CN201508017U (en) * | 2009-05-18 | 2010-06-16 | 赵庆义 | Improved gas water heater |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2013082797A1 (en) | 2013-06-13 |
| CN102494404A (en) | 2012-06-13 |
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