阅读说明：本技术 一种混合热交换的高效冷凝燃气热水炉及系统 (Mixed heat exchange efficient condensation gas water heater and system ) 是由 赵钦新 桂雍 梁志远 王云刚 邵怀爽 于 2019-10-14 设计创作，主要内容包括：本发明公开了一种混合热交换的高效冷凝燃气热水炉及系统,该热水炉包括燃烧器,换热器,将直接接触换热的喷淋系统与换热器隔开的等压烟罩以及烟囱；合理的热工设计使高温烟气经换热器换热后降温并无冷凝水产生,换热器因无需考虑冷凝水腐蚀,可降低间壁换热器材料级别和工艺成本；直接接触换热的喷淋系统雾化喷出循环喷淋液充分吸收低温烟气潜热,循环喷淋液可采用安全无毒、导热性好、粘度低且疏水的有机工质或水工质；高效冷凝燃气热水炉与热泵连接形成增效节能系统,降低循环喷淋液温度并进一步提升低温烟气冷凝传热效率从而提高热水炉及系统整体运行效率,该发明有效提高整体系统运行效率,并通过喷淋系统进一步降低烟气碳排量。(The invention discloses a mixed heat exchange efficient condensation gas water heater and a system, wherein the water heater comprises a burner, a heat exchanger, an isobaric smoke hood and a chimney, wherein the isobaric smoke hood separates a spraying system which directly contacts with the heat exchanger for heat exchange from the heat exchanger; the reasonable thermal design ensures that the high-temperature flue gas is cooled after heat exchange by the heat exchanger and no condensed water is generated, and the heat exchanger does not need to consider condensed water corrosion, so that the material grade and the process cost of the dividing wall heat exchanger can be reduced; the spray system directly contacting with the heat exchange atomizes and sprays out circulating spray liquid to fully absorb the latent heat of low-temperature flue gas, and the circulating spray liquid can adopt safe and nontoxic organic working media or water working media with good heat conductivity, low viscosity and hydrophobicity; the high-efficiency condensation gas water heater is connected with the heat pump to form a synergistic energy-saving system, the temperature of circulating spray liquid is reduced, the condensation heat transfer efficiency of low-temperature flue gas is further improved, and therefore the overall operation efficiency of the water heater and the system is improved.)

1. The utility model provides a high-efficient condensation gas water heater of mixed heat exchange which characterized in that: the device comprises a combustor (1) for generating high-temperature flue gas through combustion, a heat exchanger (2) for absorbing heat of the high-temperature flue gas, an isobaric smoke hood (3) for isolating a spray system (4) from the heat exchanger (2) and forming a flue gas isobaric channel on the outer wall of the heat exchanger (2), a shell (5) for coating the combustor (1), the heat exchanger (2), the isobaric smoke hood (3) and the spray system (4), and a chimney (6) arranged on the shell (5); the low-temperature flue gas released by the heat exchanger (2) is further absorbed by a spraying system (4) through a channel between the shell (5) and the isobaric smoke hood (3) to absorb sensible heat and latent heat and is finally discharged from a chimney (6);

the cross section of the burner (1) is circular, oval or elliptical, and is arranged on the central line of the whole hot water furnace or is offset from the central line of the whole hot water furnace so as to optimize the flow of smoke and reduce the flow resistance;

the heat exchanger (2) comprises a heat exchanger main body (21), a heat exchanger water inlet (22) and a heat exchanger water outlet (23) which are communicated with the heat exchanger main body (21);

the isobaric smoke hood (3) comprises a cover plate (31) and a low-temperature smoke outlet (32);

the spraying system (4) comprises a spraying liquid inlet (41) positioned at the top end of the shell (5) or on the peripheral side of the shell (5), when the spraying liquid inlet (41) is positioned at the top end of the shell (5), the spraying system comprises a flow equalizing pipe (42) for connecting the spraying liquid inlet (41) and a ring pipe (43), the ring pipe (43) is positioned between the flow equalizing pipe (42) and the cover plate (31) in the vertical direction, and the ring pipe (43) and the flow equalizing pipe (42) form an included angle of 90-120 degrees, when the spraying liquid inlet (41) is positioned on the peripheral side of the shell (5), a high-pressure flow equalizing spraying mode is adopted to eliminate the structure of the flow equalizing pipe (42), the manufacturing process is simplified, the structural strength is ensured, and the ring pipe (; the atomizing nozzle (44) is positioned at the bottom end of the ring pipe (43), and the condensed water outlet (45) and the spraying liquid outlet (46) are positioned at the bottom end of the shell (5);

the top in the shell (5) is provided with a chimney connecting channel (51), and the bottom is provided with a dew presenting disc (52).

2. The hybrid heat exchange high-efficiency condensing gas water heater according to claim 1, wherein: the wall temperature of the heat exchanger main body (21) is controlled to be higher than 60 ℃ under any working condition, the exhaust gas temperature is controlled to be 110-260 ℃, so that no condensate water is generated on the wall surface of the heat exchanger, and the problem of condensate water corrosion is solved, and the heat exchanger main body (21) is made of cast aluminum, cast iron, carbon steel, welded stainless steel, copper or copper fin tubes.

3. The hybrid heat exchange high-efficiency condensing gas water heater according to claim 1, wherein: the heat exchanger water inlet (22) and the heat exchanger water outlet (23) are arranged at the bottom of the heat exchanger main body (21) or are respectively arranged at the bottom or the top according to different types of the heat exchanger main body (21).

4. The hybrid heat exchange high-efficiency condensing gas water heater according to claim 1, wherein: the isobaric smoke hood (3) is manufactured independently or integrally formed with the shell (5), the isobaric smoke hood (3) forms a preset angle with the vertical direction when a low-temperature smoke outlet (32) at the bottom is adopted, or is vertically arranged when the surface of the isobaric smoke hood (3) is provided with an even ridge type exhaust port, smoke isobaric flow of the smoke under rated load can pass through a smoke isobaric channel between the isobaric smoke hood (3) and the heat exchanger main body (21), uniform heat exchange of high-temperature smoke in the heat exchanger main body (21) is ensured, a cover plate (31) of the isobaric smoke hood (3) is designed to be doubly arranged at the top, the bottom or the top and the bottom according to the arrangement mode of a heat exchanger water inlet (22) and a heat exchanger water outlet (23) so as to ensure that the heat exchanger (2) can be placed in the isobaric smoke hood (3), and the low-temperature smoke outlet (32) at the bottom of, have the spoke between two liang, strengthen structural strength, low temperature exhanst gas outlet (32) place plane and horizontal direction contained angle are 0 ~ 60, when isobaric petticoat pipe (3) and shell (5) integrated into one piece were made, top apron (31) had low temperature exhanst gas outlet (32) structure concurrently.

5. The hybrid heat exchange high-efficiency condensing gas water heater according to claim 1, wherein: the isobaric smoke hood (3) is of a single-layer or double-layer structure, cast aluminum, cast iron, stainless steel or plastic and glass fiber reinforced plastic materials with low heat conductivity coefficient and temperature resistance are adopted, and both the single-layer low heat conductivity coefficient material and the double-layer structure can prevent low-temperature spray liquid from contacting the outer wall of the isobaric smoke hood (3) and low-temperature smoke from an isobaric channel between the isobaric smoke hood (3) and the heat exchanger main body (21) to exchange heat so as to enable the inner wall of the isobaric smoke hood (3) to generate condensed water.

6. The hybrid heat exchange high-efficiency condensing gas water heater according to claim 1, wherein: when the spraying liquid inlet (41) is positioned at the top end of the shell (5), 3-9 flow equalizing pipes (42) are arranged between the spraying liquid inlet (41) and the circular pipe (43) to be connected, so that spraying liquid uniformly flows into the circular pipe (43) from the spraying liquid inlet (41), the cross section of the circular pipe (43) is in a waist-round shape, a square shape, a round shape or an oval shape, 6-18 atomizing nozzles (44) are arranged on the circular pipe (43) in the circumferential direction, 1-4 atomizing nozzles (44) are arranged on the circular pipe in the radial direction, the cross section of each atomizing nozzle (44) is in a waist-round shape, a square shape, a round shape or an oval shape, and an angle theta is 0-90 degrees with the vertical direction, the circular pipe (43) adopts a single circular pipe or multiple circular pipes to form a single-stage overhead spraying system (4), and the spraying system (4).

7. The hybrid heat exchange high-efficiency condensing gas water heater according to claim 1, wherein: the condensation water outlet (45) is of a U-shaped structure, so that the exposure disc (52) can accumulate a certain liquid level, condensation water generated in the continuous operation of the water heater is discharged from the condensation water outlet (45), the spraying liquid outlet (46) is used for discharging circulating spraying liquid, the circulating spraying liquid is also positioned at the bottom end of the shell (5) but is higher than the condensation water outlet (45), and the circulating spraying liquid adopts a safe, non-toxic, organic working medium or a water working medium with good thermal conductivity, low viscosity and hydrophobicity.

8. The hybrid heat exchange high-efficiency condensing gas water heater according to claim 1, wherein: the shell (5) is made of stainless steel, cast aluminum silicon or plastic materials resistant to condensate water corrosion, the exposure disc (52) has a certain height to contain circulating spray liquid and condensate water, and meanwhile, the circulating spray liquid is separated from the condensate water by using a safe, non-toxic, good-heat-conductivity, low-viscosity and hydrophobic organic working medium, so that the condensate water and the circulating spray liquid are discharged from a condensate water outlet (45) and a spray liquid outlet (46) at the bottom respectively.

9. The hybrid heat exchange high-efficiency condensing gas water heater according to claim 1, wherein: according to the position relation of the heat exchanger (2) and the spraying system (4), the arrangement form of the water heater is in a surrounding arrangement form, a left-right arrangement form or an up-down arrangement form.

10. The energy-saving system for the high-efficiency condensing gas water heater using the mixed heat exchange of any one of claims 1 to 8, is characterized in that: the high-efficiency condensation gas water heater comprises a heat pump system (7), a plate type heat exchanger (8), a valve bank (9) and the high-efficiency condensation gas water heater with mixed heat exchange as claimed in any one of claims 1 to 8, wherein the heat exchanger (2) and a condenser (72) in the heat pump system (7) form a main body heat exchange subsystem, and the main body heat exchange subsystem is connected in a way that: the heat exchanger water outlet (23), the plate heat exchanger (8) import, the plate heat exchanger (8) export-condenser (72) import, condenser (72) export, heat exchanger water inlet (22) connect gradually, evaporimeter (71) in sprinkling system (4) and the heat pump system (7) constitute secondary and spray the heat transfer subsystem, and the connected mode that secondary sprayed the heat transfer subsystem is: the spraying liquid outlet (46), the evaporator (71) inlet, the evaporator (71) outlet and the spraying liquid inlet (41) are connected in sequence; the inlet and outlet pipelines of the evaporator (71) and the condenser (72) in the heat pump system (7) are respectively provided with a valve (91) to form a valve group (9), the inlet and outlet short-circuit pipelines of the condenser (72) are provided with a short-circuit valve (92), when the heat pump system (7) is started, the short-circuit valves (92) are closed, all the valves (91) in the valve group (9) are opened, and when the heat pump system is closed, all the valves (91) in the valve group (9) are closed.

Technical Field

The invention belongs to the field of heat exchange heat exchangers which improve energy utilization efficiency and are energy-saving and environment-friendly, and particularly relates to a high-efficiency condensation gas water heater and a system for mixed heat exchange.

Background

The low-nitrogen high-efficiency condensing gas water heater is an upgrading water heater with technical advancement and market popularization potential for the new generation which is developed and shaped through years of technical research and development for meeting increasingly strict energy-saving and environment-friendly emission requirements worldwide. The existing low-nitrogen high-efficiency condensation gas water heater organically combines an ultra-high-efficiency compact heat exchanger and an ultra-low-nitrogen high-efficiency fully-premixed burner, integrates multiple key technologies in the field of thermal energy engineering, such as low-nitrogen gas emission, radiation heat exchange, turbulence and condensation enhanced heat transfer, water circulation, new materials, new processes, climate compensation dynamic control and the like, and jointly realizes dual technical targets of ultra-low emission and ultra-high-efficiency waste heat recovery. The technical aim can greatly improve the utilization efficiency of clean heat supply of natural gas, and the low-nitrogen high-efficiency condensation gas water heater becomes a rigid choice for replacing the traditional steel and cast iron gas boilers. The low-nitrogen high-efficiency condensation gas water heater can be divided into a household condensation gas water heater and a commercial condensation gas water heater according to the size of heat supply power, the capacity of the household condensation gas water heater is less than 100kW, the household condensation gas water heater can be subdivided into a household condensation gas wall-mounted water heater (less than or equal to 50kW) and a condensation gas floor water heater (less than 100kW), the capacity of the commercial gas water heater is more than or equal to 100kW to 2800kW, but the integration number of modules of the low-nitrogen high-efficiency condensation gas water heater can reach 28MW (equivalent to the heat supply capacity of a traditional 40t/h boiler, and 40 ten thousand²Building heating) still has technical economy. No matter the condensation gas wall-hanging stove, the condensation gas floor stove or the commercial condensation fuelThe basic structure of the gas hot water boiler is that the product which is organically combined by an ultra-low nitrogen full-premix flameless burner and an ultra-high efficiency compact heat exchanger and is specially applied to domestic hot water supply and heating hot water supply for people, wherein the condensed gas wall-mounted boiler and the condensed gas floor boiler are mainly applied to families for simultaneously supplying domestic hot water and heating hot water, and the commercial condensed gas hot water boiler is mainly applied to schools, hospitals, commercial residences and living quarters for simultaneously supplying domestic hot water and heating hot water or can be used for heating water singly. The domestic condensation gas water heater and the commercial condensation gas water heater have some differences in structure, but the general technical principle and the core are the same.

Although the high-power low-nitrogen high-efficiency condensation gas water heater is used for effectively saving energy, the manufacturing cost is high, and the main reason is that the heat exchanger body of the water heater corresponding to the high power has large volume and weight. The heat exchange capacity is strong in the area with higher flue gas temperature due to large end difference; in the area with lower flue gas temperature, the end difference is small, the heat flux density is small, the heat exchange capacity of the heat exchanger is weak, and the required heat exchange area and the required volume are large. The low-efficiency heat exchange area with low flue gas temperature is a key factor influencing the quality and the control cost of the heat exchanger of the water heating furnace. For small-end-difference heat exchange, the thermal resistance of the direct contact heat exchange mode adopting the spraying mode is obviously smaller than that of the indirect heat exchange mode adopting the heat exchanger, and the cost of the heat exchanger can be effectively reduced by adopting the direct contact heat exchange mode.

Disclosure of Invention

In order to effectively reduce the cost of the low-nitrogen high-efficiency condensation gas water heater and further improve the heat exchange efficiency of the low-nitrogen high-efficiency condensation gas water heater, the invention provides a high-efficiency condensation gas water heater and a system with mixed heat exchange.

The invention is realized by the following technical scheme:

a high-efficiency condensation gas water heater with mixed heat exchange comprises a combustor 1 for generating high-temperature flue gas through combustion, a heat exchanger 2 for absorbing heat of the high-temperature flue gas, an isobaric smoke hood 3 for isolating a spray system 4 from the heat exchanger 2 and forming a flue gas isobaric channel on the outer wall of the heat exchanger 2, a shell 5 for coating the combustor 1, the heat exchanger 2, the isobaric smoke hood 3 and the spray system 4, and a chimney 6 arranged on the shell 5; the low-temperature flue gas after heat release by the heat exchanger 2 is further absorbed by a spraying system 4 through a channel between the shell 5 and the isobaric smoke hood 3 to absorb sensible heat and latent heat and is finally discharged from a chimney 6;

the section of the burner 1 is circular, oval or elliptical, and is arranged on the central line of the whole water heater or offset from the central line of the whole water heater to optimize the flow of smoke and reduce the flow resistance;

the heat exchanger 2 comprises a heat exchanger main body 21, a heat exchanger water inlet 22 and a heat exchanger water outlet 23 which are communicated with the heat exchanger main body 21;

the isobaric smoke hood 3 comprises a cover plate 31 and a low-temperature smoke outlet 32;

the spraying system 4 comprises a spraying liquid inlet 41 positioned at the top end of the shell 5 or on the peripheral side of the shell 5, when the spraying liquid inlet 41 is positioned at the top end of the shell 5, the spraying liquid inlet 41 comprises a flow equalizing pipe 42 for connecting the spraying liquid inlet 41 and a circular pipe 43, the circular pipe 43 is positioned between the flow equalizing pipe 42 and the cover plate 31 in the vertical direction, the circular pipe 43 and the flow equalizing pipe 42 form an included angle of 90-120 degrees, when the spraying liquid inlet 41 is positioned on the peripheral side of the shell 5, a high-pressure flow equalizing spraying mode is adopted to eliminate the structure of the flow equalizing pipe 42, the manufacturing process is simplified, the structural strength; also comprises an atomizing nozzle 44 positioned at the bottom end of the ring pipe 43, a condensed water outlet 45 and a spraying liquid outlet 46 positioned at the bottom end of the shell 5;

the top of the shell 5 is provided with a chimney connecting channel 51, and the bottom is provided with a presentation disc 52.

The wall temperature of the heat exchanger main body 21 is controlled to be higher than 60 ℃ under any working condition, the exhaust gas temperature is controlled to be in the range of 110-260 ℃, so that no condensate water is generated on the wall surface of the heat exchanger, and the heat exchanger main body 21 is made of cast aluminum, cast iron, carbon steel, welded stainless steel, copper or copper fin tubes.

The heat exchanger water inlet 22 and the heat exchanger water outlet 23 are both arranged at the bottom of the heat exchanger main body 21 or respectively arranged at the bottom or the top according to different types of the heat exchanger main body 21.

The isobaric smoke hood 3 is manufactured independently or integrally formed with the shell 5, the isobaric smoke hood 3 is at a preset angle with the vertical direction when a low-temperature smoke outlet 32 at the bottom is adopted, or the isobaric smoke hood 3 is vertically arranged when the surface has an even ridge type exhaust port, the isobaric flow of smoke under rated load can pass through a smoke isobaric channel between the isobaric smoke hood 3 and the heat exchanger main body 21, the uniform heat exchange of high-temperature smoke in the heat exchanger main body 21 is ensured, a cover plate 31 of the isobaric smoke hood 3 is designed to be top, bottom or double arrangement of top and bottom according to the arrangement mode of a heat exchanger water inlet 22 and a heat exchanger water outlet 23 so as to ensure that the heat exchanger 2 can be placed in the isobaric smoke hood 3, the low-temperature smoke outlet 32 at the bottom of the isobaric smoke hood 3 is uniformly provided with 4-24 annular holes, spokes are arranged between every two parts, the structural strength, when the isobaric smoke hood 3 and the shell 5 are integrally formed, the top cover plate 31 has a structure of a low-temperature smoke outlet 32.

When the spraying liquid inlet 41 is positioned at the top end of the shell 5, 3-9 flow equalizing pipes 42 are arranged between the spraying liquid inlet 41 and the circular pipe 43 to connect, so that spraying liquid uniformly flows into the circular pipe 43 from the spraying liquid inlet 41, the cross section of the circular pipe 43 is in a shape of a waist circle, a square, a circle or an ellipse, 6-18 atomizing nozzles 44 are arranged on the circular pipe 43 in the circumferential direction, 1-4 atomizing nozzles 44 are arranged on the circular pipe 43 in the radial direction, the cross section of each atomizing nozzle 44 is in a shape of a waist circle, a square, a circle or an ellipse, and an angle theta is 0-90 degrees with the vertical direction, the circular pipe 43 adopts a single circular pipe or multiple circular pipes to form a single-stage or multi-stage spraying system 4, and the spraying system 4 adopts.

The condensed water outlet 45 is of a U-shaped structure, so that the exposure disc 52 can accumulate a certain liquid level, condensed water generated in the continuous operation of the water heater is discharged from the condensed water outlet 45, the spraying liquid outlet 46 is used for discharging circulating spraying liquid, is also positioned at the bottom end of the shell 5 but is higher than the condensed water outlet 45, and the circulating spraying liquid adopts a safe, non-toxic, organic working medium or a water working medium which has good thermal conductivity, low viscosity and is hydrophobic.

The shell 5 is made of stainless steel, cast aluminum silicon or plastic materials resistant to condensate water corrosion, the exposure disc 52 has a certain height to contain circulating spray liquid and condensate water, and meanwhile, the circulating spray liquid is separated from the condensate water by using a safe, nontoxic, organic working medium with good thermal conductivity, low viscosity and hydrophobicity, so that the condensate water and the circulating spray liquid are respectively discharged from the bottom condensate water outlet 45 and the spray liquid outlet 46.

Adopt the efficiency-enhancing and energy-saving system of a mixed heat exchange's high-efficient condensation gas water heater, including heat pump system 7, plate heat exchanger 8, valves 9 and a mixed heat exchange's high-efficient condensation gas water heater, condenser 72 in heat exchanger 2 and the heat pump system 7 constitutes main part heat transfer subsystem, and main part heat transfer subsystem's connected mode is: the heat exchanger water outlet 23, the plate heat exchanger 8 inlet, the plate heat exchanger 8 outlet-condenser 72 inlet, the condenser 72 outlet, and the heat exchanger water inlet 22 are connected in sequence, the spraying system 4 and the evaporator 71 in the heat pump system 7 form a secondary spraying heat exchange subsystem, and the connection mode of the secondary spraying heat exchange subsystem is as follows: the spraying liquid outlet 46, the evaporator 71 inlet, the evaporator 71 outlet and the spraying liquid inlet 41 are connected in sequence; the inlet and outlet pipelines of the evaporator 71 and the condenser 72 in the heat pump system 7 are respectively provided with a valve 91 to form a valve group 9, the inlet and outlet short-circuit pipelines of the condenser 72 are provided with a short-circuit valve 92, when the heat pump system 7 is started, the short-circuit valve 92 is closed, all the valves 91 in the valve group 9 are opened, and when the heat pump system is closed, all the valves 91 in the valve group 9 are closed.

The temperature of the circulating spray liquid is reduced to further enhance the condensation heat transfer efficiency of the low-temperature flue gas, the return water temperature of the water inlet 22 of the heat exchanger is increased, the water heater and the heat pump are in synergistic coupling, the operation efficiency of the whole system is effectively improved, and the sensitivity of load return water temperature fluctuation to the operation efficiency is reduced.

All parts in the indirect and direct contact heat exchange integrated efficient gas hot water furnace are flexibly configured, and the whole body can be arranged in a surrounding mode, a left-right mode and an up-down mode.

Compared with the prior art, the invention has the following advantages:

1. the water heater adopts an indirect and direct contact composite heat exchange mode, the temperature of the wall surface of the heat exchanger main body is controlled to be higher than 60 ℃ under any working condition, and preferably the temperature of exhaust gas is controlled to be in the range of 180-300 ℃, so that the wall surface of the heat exchanger does not generate condensed water, the problems of condensed water corrosion and the like are avoided, and the heat exchanger with cast aluminum, cast iron, carbon steel, welded stainless steel and copper fin tube materials and any process and structure can be adopted, so that the use threshold of the heat exchanger is reduced.

2. The water heater adopts an indirect and direct contact composite heat exchange mode, and a spraying direct contact heat exchange mode is used for replacing an area with low flue gas temperature, small end difference, small heat flux density and weak heat exchange capacity in the heat exchanger, so that a large number of low-efficiency areas of the heat exchanger are eliminated, and the consumption of raw materials of the heat exchanger and the process cost are effectively reduced.

3. The water heater of the invention adopts a spraying direct contact heat exchange mode to strengthen condensation heat exchange in low-temperature flue gas heat exchange with small end difference, thereby effectively reducing the volume of the water heater and leading the furnace body to be more compact.

4. The system adopts a coupling heat pump design, reduces the temperature of circulating spray liquid to further enhance the condensation heat transfer efficiency of low-temperature flue gas, improves the return water temperature of the water inlet of the heat exchanger, realizes synergistic coupling of the water heater and the heat pump, effectively improves the operation efficiency of the whole system, and reduces the sensitivity of load return water temperature fluctuation to the operation efficiency.

Drawings

FIG. 1 is an overall schematic view of an efficient condensing gas-fired water heater and a heat pump coupled to form an energy-saving system.

Fig. 2 is a three-dimensional view of an indirect and direct contact heat exchange integrated efficient condensation gas water heater, wherein fig. 2(a) is a front view, and fig. 2(b) is a half-section view.

Fig. 3 is a three-dimensional view of the indirect and direct contact heat exchange integrated high-efficiency condensation gas water heater integrally injection-molded by the isobaric smoke hood 3 and the shell 5, wherein fig. 3(a) is a front view, and fig. 3(b) is a half-sectional view.

Fig. 4 is a three-dimensional view of an integrated high-efficiency condensing gas water heater using a single-side or double-side liquid inlet manner in which a spraying liquid inlet 41 is arranged outside a housing 5, wherein fig. 4(a) is a front view, fig. 4(b) is a half-sectional view, and fig. 4(c) is a top sectional view.

Fig. 5 is a three-dimensional view of an integrated high-efficiency condensing gas water heater using a ridge type exhaust port isobaric cover 3, wherein fig. 5(a) is a front view, fig. 5(b) is a half-sectional view, fig. 5(c) is a cross-sectional top view, and fig. 5(d) is a ridge type exhaust port schematic diagram.

Fig. 6 is a three-dimensional view of an integrated high-efficiency condensing gas water heater using a multi-stage spray form, in which fig. 6(a) is a front view, fig. 6(b) is a half-sectional view, and fig. 6(c) is a top sectional view.

Fig. 7 is a three-dimensional view of an integrated high-efficiency condensing gas water heater in an inverted spray form, wherein fig. 7(a) is a front view and fig. 7(b) is a half-sectional view.

Fig. 8 is a three-dimensional view of an integrated high-efficiency condensing gas water heater using a combination of top-mounted and inverted showers, wherein fig. 8(a) is a front view and fig. 8(b) is a half-sectional view.

Fig. 9 is a detailed view of the spraying system, wherein the cross section of the ring pipe 43 in fig. 9(1a), 9(2a), 9(3a) and 9(4a) is respectively a circular waist shape, a square shape, a circular shape and an elliptical shape, the ring pipe 43 is arranged to form a single-stage or multi-stage atomizing nozzle 44, fig. 9(1b), 9(2b), 9(3b) and 9(4b) are respectively schematic diagrams of the appearance of the atomizing nozzle 44 in the circular waist shape, the square shape, the circular shape and the elliptical shape, and fig. 9(c) is a schematic diagram of the angle formed by the atomizing nozzle 44 and the vertical direction.

Fig. 10 is a schematic view of various external appearances of the burner 1, in which fig. 10(a), fig. 10(b), and fig. 10(c) are respectively circular, oval, and elliptical.

FIG. 11 is a schematic view of a left-right arranged indirect and direct contact heat exchange integrated high-efficiency condensation gas water heater.

FIG. 12 is a schematic view of an indirect and direct contact heat exchange integrated high-efficiency condensing gas water heater arranged up and down.

Detailed Description

The invention is described in further detail below with reference to the following figures and specific examples: