Condensing heat exchange device and condensing gas water heating equipment

Abstract

The utility model belongs to water heater technical field discloses condensing heat exchange device and condensing gas hot water equipment, and the heat exchange department of condensing heat exchange pipe is located in the condensing casing, and the condensing water baffle is fixedly installed in the condensing casing, the condensing water baffle is located the top of flue gas export, prevents the condensing water drop of condensing heat exchange pipe from falling into flue gas export, in the process that condensing gas hot water equipment works, the condensing water that the flue gas structure is just above falls down and falls to the condensing water baffle, and falls to the bottom of condensing casing under the flow guiding effect of condensing water baffle, thereby prevents the condensing water from falling into flue after falling, enters main heat exchanger and corrodes main heat exchanger, prolongs the service life of condensing gas hot water equipment.

Description

Technical Field

[0001] This utility model relates to the field of water heater technology, and in particular to a condensing heat exchange device and a condensing gas water heater. Background Technology

[0002] Condensing gas-fired water heaters consist of a main heat exchanger and a condensing heat exchanger. To reduce the overall width of the unit, some condensing gas-fired water heaters place the condensing heat exchanger above the main heat exchanger. A flue is located at the bottom of the condensing heat exchanger. The flue gas produced during combustion exchanges heat with the main heat exchanger and then enters the condensing heat exchanger through the flue outlet. To enhance heat exchange, baffles are installed inside the condensing heat exchanger cavity to allow the flue gas to flow in a meandering manner, extending its flow path. The flue outlet is typically designed to face upwards. Condensate dripping from the surface of the condensing heat exchange tubes above the flue outlet easily falls through the flue outlet onto the main heat exchanger below. Because condensate is acidic and corrosive, and the heat exchange tubes inside the main heat exchanger are made of copper, the condensate easily corrodes the copper components, thus shortening the overall lifespan of the unit. Utility Model Content

[0003] One of the technical problems solved by this utility model is to provide a condensation heat exchange device that can prevent condensate formed on the surface of the condensation heat exchange tube above the flue outlet from dripping into the main heat exchanger and causing corrosion to the heat exchange tube of the main heat exchanger.

[0004] The second technical problem solved by this utility model is to provide a condensing gas-fired water heater that can extend the service life of the entire unit.

[0005] The first technical problem mentioned above is solved by the following technical solution:

[0006] Condensation heat exchange device, including:

[0007] A condenser shell has a smoke inlet structure protruding from its inner bottom. The smoke inlet structure has a flue. The lower end of the flue extends through the bottom wall of the condenser shell to form a flue gas inlet, and the upper end of the flue extends through the upper surface of the smoke inlet structure to form a flue gas outlet.

[0008] A condenser heat exchanger tube, wherein the heat exchange section of the condenser heat exchanger tube is disposed inside the condenser shell;

[0009] A condensate baffle is fixedly installed inside the condenser housing and located above the flue gas outlet to prevent condensate from the condenser heat exchange tube from dripping into the flue gas outlet.

[0010] The condensation heat exchange device described in this utility model has the following advantages compared with the prior art:

[0011] This condensing heat exchanger is used in condensing gas-fired water heaters. The condensate baffle is located above the flue gas outlet. During operation, condensate from the heat exchange tubes directly above the flue gas inlet structure drips onto the baffle, preventing it from entering the flue and corroding the main heat exchanger, thus extending the lifespan of the condensing gas-fired water heater. Furthermore, because the flue gas inlet structure protrudes from the inner bottom wall of the condensing shell, and the upper end of the flue extends to the upper surface of the inlet structure, with the flue gas outlet higher than the inner bottom wall of the condensing shell, condensate accumulated at the bottom of the condensing shell will not enter the flue.

[0012] In one embodiment, the fixed end of the condensate baffle is connected to the top of the smoke inlet structure along the second horizontal direction, and the free end of the condensate baffle is inclined upward.

[0013] In one embodiment, the condensate baffles are spaced apart above the flue gas inlet structure; the condensate baffles include a baffle body and a first connecting portion connected to the end of the baffle body along a second horizontal direction; the baffle body is fixedly installed on the inner side wall of the condensate shell through the first connecting portion; the upper edge of the baffle body is folded downward to form a first flange, and the projection of the first flange on the horizontal plane is not within the projection of the flue gas outlet on the horizontal plane.

[0014] In one embodiment, the condensate baffles are spaced apart above the smoke inlet structure; the condensate baffles include two side plates spaced apart from each other along a first horizontal direction; a water collection trough with a top opening is formed between the two side plates, and a drip hole is provided at the lowest position of the water collection trough, the projection of the drip hole on the horizontal plane is not within the projection of the flue gas outlet on the horizontal plane; the upper edge of each side plate is folded downwards at an angle away from the other side plate to form a second flange, and the flue gas outlet is located between the lower edges of the two second flanges along the first horizontal direction.

[0015] In one embodiment, the condenser housing includes a first sidewall and a second sidewall disposed opposite to each other along a first horizontal direction, the smoke inlet structure is spaced apart from the first sidewall along the first horizontal direction, and the second sidewall is provided with a smoke outlet.

[0016] In one embodiment, a baffle plate is provided inside the condenser housing, and the baffle plate is located between the condenser heat exchange tube and the second side wall;

[0017] The baffle plate has a first end and a second end that are arranged opposite to each other along a second horizontal direction. The smoke outlet is located between the first end and the second end along the second horizontal direction. The condensing heat exchange tube is located on the side of the baffle plate away from the smoke outlet. The top surface of the baffle plate is higher than the lowest point of the smoke outlet and the lower end of the baffle plate is lower than the lowest point of the smoke outlet.

[0018] Along the first horizontal direction, the first end is spaced apart from the inner wall of the condenser shell; the second end is connected to the inner wall of the condenser shell in the vertical direction; the first horizontal direction and the second horizontal direction are perpendicular.

[0019] In one embodiment, a first water guide groove is formed between the first sidewall and the smoke inlet structure, and the height of the inner bottom wall of the first water guide groove gradually decreases or remains unchanged along the second horizontal direction; a second water guide groove is formed at least one end of the smoke inlet structure and the inner wall of the condenser shell at intervals along the second horizontal direction; and the height of the inner bottom wall of the condenser shell located between the smoke inlet structure and the smoke outlet gradually decreases along the first horizontal direction.

[0020] A rain collection chamber is formed between the wind baffle and the second sidewall. A drain outlet is provided at the lowest position of the rain collection chamber. A condensation heat exchange chamber is formed between the wind baffle and the first sidewall. The bottom of the condensation heat exchange chamber is connected to the bottom of the rain collection chamber.

[0021] In one embodiment, the condenser heat exchange tube includes a plurality of sequentially connected sub-tube sections, and the plurality of sub-tube sections are arranged in at least two columns along a first horizontal direction;

[0022] Along the first horizontal direction, at least one smoke baffle is provided between the smoke outlet and the smoke inlet structure, and the smoke baffle is provided between at least two adjacent rows of the sub-tubes;

[0023] A smoke passage is formed between the lower end of the smoke baffle adjacent to the smoke inlet structure and the inner bottom wall of the condensation shell, and the top surface of the smoke inlet structure is higher than the smoke passage; and / or, a smoke passage is formed between the lower end of the smoke baffle adjacent to the wind baffle and the inner bottom wall of the condensation shell, and the top surface of the wind baffle is higher than the smoke passage.

[0024] In one embodiment, the cross-sectional area of ​​the flue gradually decreases from bottom to top along the flue gas flow direction, and the ratio of the minimum cross-sectional area of ​​the flue to the cross-sectional area of ​​the flue outlet is Q, where 1 < Q ≤ 1.2.

[0025] The second technical problem mentioned above is solved by the following technical solution:

[0026] A condensing gas-fired water heater is characterized in that it includes a main heat exchanger and a condensing heat exchange device as provided in any of the above embodiments. The main heat exchanger includes a heat exchange shell located below the condensing shell, and the inner cavity of the heat exchange shell is connected to the inner cavity of the condensing shell through the flue.

[0027] Compared with the prior art, the condensing gas-fired water heater of this utility model has the following advantages:

[0028] The condensing gas water heater includes the aforementioned condensing heat exchange device. The condensate baffle is located above the flue gas outlet. During the operation of the condensing gas water heater, the condensate water condensed on the condensing heat exchange tube located directly above the flue gas inlet structure drips down and falls onto the condensate baffle, thereby preventing the condensate water from falling into the flue and entering the main heat exchanger, thus corroding the main heat exchanger and extending the service life of the condensing gas water heater.

[0029] In addition, since the flue gas inlet structure protrudes from the inner bottom wall of the condenser shell, and the upper end of the flue extends to the upper surface of the flue gas inlet structure, the flue gas outlet is higher than the inner bottom wall of the condenser shell, so that the condensate water accumulated at the bottom of the condenser shell will not enter the flue. Attached Figure Description

[0030] Figure 1 This is a partial structural cross-sectional view of the condensing gas-fired water heater provided in Embodiment 1 of this utility model;

[0031] Figure 2 This is a partial exploded view of the condensing gas water heater provided in Embodiment 1 of this utility model;

[0032] Figure 3 This is a cross-sectional view of the condensation heat exchange device provided in Embodiment 1 of this utility model;

[0033] Figure 4 This is a first cross-sectional view of the condenser box provided in Embodiment 1 of this utility model;

[0034] Figure 5 This is a second cross-sectional schematic diagram of the condenser box provided in Embodiment 1 of this utility model;

[0035] Figure 6 This is a schematic diagram showing the flow direction of condensate in the condensation box provided in Embodiment 1 of this utility model;

[0036] Figure 7 This is a partial exploded view of the condensing gas water heater provided in Embodiment 2 of this utility model;

[0037] Figure 8 This is a partial structural cross-sectional view of the condensing gas-fired water heater provided in Embodiment 2 of this utility model;

[0038] Figure 9 This is a cross-sectional view of the condensation heat exchange device provided in Embodiment 2 of this utility model;

[0039] Figure 10 This is a schematic diagram of the structure of the condenser box provided in Embodiment 2 of this utility model;

[0040] Figure 11 This is a cross-sectional view of the condenser shell provided in Embodiment 3 of this utility model;

[0041] Figure 12 This is a cross-sectional view of the condensation heat exchange device provided in Embodiment 3 of this utility model.

[0042] In the picture:

[0043] 1. Condenser shell; 11. Condenser box; 11a. First side wall; 11b. Second side wall; 11b1. Smoke outlet; 11c. Drain outlet; 111. Smoke inlet structure; 1111. First inclined outer wall; 1112. Second inclined outer wall; 112. Flue; 1121. Smoke inlet; 1122. Smoke outlet; 113. Smoke baffle; 1131. Smoke passage hole; 114. Wind baffle; 1141. First end; 1142. Second end; 115. Mounting protrusion; 1151. Slot; 116. Condenser base plate; 12. Smoke hood;

[0044] 2. Condensing heat exchange tubes; 21. Sub-tube section;

[0045] 3. Condensation baffle; 311. First flange; 315. Baffle body; 316. First connecting part; 32. Second connecting part; 31. Side plate; 312. Second flange; 313. Water collection tank; 314. Drip hole;

[0046] 4. Thermostat;

[0047] 5. Main heat exchanger; 51. Heat exchange shell; 52. Heat exchange tube; 53. Heat exchange fins;

[0048] 6. Heat insulation cover; 61. Flue gas vent;

[0049] 10. Rain collection chamber; 20. Condensation heat exchange chamber; 201. First chamber; 202. Second chamber; 30. Smoke passage; 40. First water guide channel; 50. Second water guide channel; 60. Combustion chamber; 70. Insulation chamber; 80. Water passage. Detailed Implementation

[0050] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0051] In the description of this application, it should be understood that the terms "center", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0052] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0053] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0054] like Figures 1 to 3 As shown, the embodiments of this utility model provide a condensing heat exchange device and a condensing gas water heater including the condensing heat exchange device. The condensing gas water heater also includes a main heat exchanger 5. The main heat exchanger 5 includes a heat exchange shell 51 located below the condensing shell 1. The heat exchange shell 51 is provided with a plurality of heat exchange tubes 52 and a plurality of heat exchange fins 53. Each heat exchange tube 52 passes through a plurality of heat exchange fins 53.

[0055] The condensation heat exchange device includes a condenser shell 1 and a condensate baffle 3. The bottom of the condenser shell 1 is provided with a flue gas inlet structure 111. The flue gas inlet structure 111 is provided with a flue 112. The lower end of the flue 112 extends through the bottom wall of the condenser shell 1 to form a flue gas inlet 1121, and the upper end of the flue 112 extends through the upper surface of the flue gas inlet structure 111 to form a flue gas outlet 1122. The condensate baffle 3 is fixedly installed on the condenser shell 1 and is located above the flue gas outlet 1122 to prevent condensate from dripping into the flue gas outlet 1122.

[0056] The condenser shell 1 is also equipped with a condenser heat exchange tube 2, which is located inside the condenser shell 1. After the flue gas is cooled down by heat exchange in the heat exchange shell 51, it enters the condenser shell 1 through the flue 112. The hot flue gas and the cold water in the condenser heat exchange tube 2 exchange heat. During this process, condensate water easily forms on the outer wall of the condenser heat exchange tube 2 and the inner wall of the condenser shell 1. The condensate water drips down to the bottom of the condenser shell 1.

[0057] Since the condensate baffle 3 is located above the flue gas outlet 1122, during the operation of the condensing gas water heater, the condensate dripping from directly above the flue gas inlet structure 111 will fall onto the condensate baffle 3 and, under the guiding effect of the condensate baffle 3, fall to the bottom of the condensing shell 1. This prevents the condensate from falling through the flue gas outlet 1122 into the flue 112 and then into the main heat exchanger 5, thus corroding the main heat exchanger 5 and extending the service life of the condensing gas water heater.

[0058] Furthermore, since the smoke inlet structure 111 protrudes from the inner bottom wall of the condenser shell 1, and the upper end of the flue 112 extends to the upper surface of the smoke inlet structure 111, the flue gas outlet 1122 is higher than the inner bottom wall of the condenser shell 1, so that the condensate water accumulated at the bottom of the condenser shell 1 will not enter the flue 112.

[0059] Furthermore, in order to better prevent the condensate from the condenser heat exchanger tube 2 from dripping onto the flue gas outlet 1122, the projection of the condensate baffle 3 on the horizontal plane completely covers the projection of the flue gas outlet 1122 on the horizontal plane.

[0060] In some embodiments, such as Figure 3 As shown, at least part of the condenser heat exchange tube 2 is located directly above the condenser baffle 3 to make full use of the space directly above the condenser baffle 3 and reduce the width of the condenser shell 1 in the first horizontal direction.

[0061] In some embodiments, such as Figure 3As shown, the condenser housing 1 includes a first sidewall 11a and a second sidewall 11b arranged opposite each other along a first horizontal direction. The flue gas inlet structure 111 is spaced apart from the first sidewall 11a along the first horizontal direction, and the second sidewall 11b is provided with a flue gas outlet 11b1. Since the condensing gas water heater using this condensing heat exchange device is tested before leaving the factory, after the test, the condensing gas water heater is placed upside down. The flue gas outlet 11b1 is connected to the exhaust structure, and it is not convenient to use the side where the exhaust structure is located as the bottom surface. When the condensing gas water heater is placed upside down, the side where the first sidewall 11a is located is usually used as the bottom surface. Most of the heat exchange tubes 52 are basically located between the flue gas inlet structure 111 and the second sidewall 11b. After the condensing gas water heater is placed upside down, a small amount of condensate will fall onto the first sidewall 11a. The flue gas inlet structure 111 is spaced apart from the first side wall 11a along the first horizontal direction, which can prevent condensate falling on the first side wall 11a from entering the flue 112 through the flue gas outlet 1122 and then flowing into the main heat exchanger 5.

[0062] In some embodiments, such as Figure 3 As shown, the fixed end of the condensate baffle 3 is connected to the top of the smoke inlet structure 111 along the second horizontal direction, and the free end of the condensate baffle 3 is inclined upward. Specifically, the free end of the condensate baffle 3 is inclined upward in a direction away from the second sidewall 11b. Exemplarily, the condensate baffle 3 is a flat plate structure, and the second horizontal direction is perpendicular to the second horizontal direction.

[0063] After the condensing gas water heater is inverted, a small amount of condensate will fall onto the first side wall 11a. During this process, the condensate baffle 3 can block the flue gas outlet 1122, preventing condensate from entering the flue 112. Moreover, the condensate dripping onto the upper surface of the condensate baffle 3 can also slide down to the inner bottom of the condenser shell due to the guiding effect of the condensate baffle 3. For example, the condensate baffle 3 is integrally formed into the flue gas inlet structure 111, which simplifies the processing of the condensate baffle 3, reduces processing costs, and eliminates the need for other structures to fix the condensate baffle 3 to the flue gas inlet structure 111.

[0064] Specifically, such as Figure 3 and Figure 4 As shown, the flue 112 is a rectangular hole. The width direction of the rectangular hole is the first horizontal direction, and the length direction of the rectangular hole is the second horizontal direction. The first horizontal direction, the second horizontal direction, and the vertical direction are perpendicular to each other, which increases the flow area of ​​the flue 112 for circulating hot flue gas, so that the flue gas in the heat exchange shell 51 can enter the condenser shell 1 in a timely manner through the flue 112.

[0065] In one embodiment, such as Figure 3As shown, the cross-sectional area of ​​flue 112 gradually decreases along the flue gas flow direction, and the ratio of the minimum cross-sectional area of ​​flue 112 to the cross-sectional area of ​​flue outlet 11b1 is Q, where 1 < Q ≤ 1.2. This setting can reduce the exhaust resistance and ensure that the exhaust resistance of the high-temperature flue gas flowing through the main heat exchanger 5 remains constant and appropriate.

[0066] In some embodiments, such as Figure 3 As shown, the flue gas inlet structure 111 has two first inclined outer walls 1111 arranged opposite each other along a first horizontal direction. The distance between the two first inclined outer walls 1111 gradually increases along the first horizontal direction from top to bottom. With this arrangement, when the condensing gas water heater is inverted, the arrangement of the first inclined outer walls 1111 can increase the height of the flue gas outlet 1122, preventing condensate water accumulated on the first side wall 11a from entering the flue gas outlet 1122 and entering the flue duct 112. Moreover, condensate water dripping onto the first inclined outer wall 1111 near the flue gas outlet 11b1 can slide down under the guiding effect of the first inclined outer wall 1111, preventing condensate water from entering the flue gas outlet 1122 and entering the flue duct 112.

[0067] like Figure 3 As shown, since the flue gas outlet 11b1 is usually exposed to the outside atmosphere, external wind and rain may enter the condenser shell 1 through the flue gas outlet 11b1, thus affecting the heat exchange effect of the flue gas in the condenser heat exchange tube 2 and the condenser shell 1. Therefore, in one embodiment, a baffle plate 114 is provided inside the condenser shell 1, and the baffle plate 114 is located between the condenser heat exchange tube 2 and the second side wall 11b. The baffle plate 114 has a first end 1141 and a second end 1142 arranged opposite to each other along a second horizontal direction. The flue gas outlet 11b1 is located between the first end 1141 and the second end 1142 along the second horizontal direction. The condenser heat exchange tube 2 is located on the side of the baffle plate 114 away from the flue gas outlet 11b1. The top surface of the baffle plate 114 is higher than the lowest point of the flue gas outlet 11b1 and the lower end of the baffle plate 114 is lower than the lowest point of the flue gas outlet 11b1. Along the first horizontal direction, the first end 1141 is spaced apart from the inner wall of the condenser shell 1. The second end 1142 is connected to the inner wall of the condenser shell 1 in the vertical direction.

[0068] Because the top surface of the baffle plate 114 is higher than the lowest point of the flue gas outlet 11b1, and the lower end of the baffle plate 114 is lower than the lowest point of the flue gas outlet 11b1, and the flue gas outlet 11b1 is located between the first end 1141 and the second end 1142 along the second horizontal direction, the baffle plate 114 can block external rainwater, greatly reducing the probability of external rainwater entering the side of the baffle plate 114 near the condenser heat exchange tube 2, thus ensuring the heat exchange effect of the condenser heat exchange tube 2. Moreover, along the first horizontal direction, the first end 1141 is spaced apart from the inner wall of the condenser shell 1; the second end 1142 is vertically connected to the inner wall of the condenser shell 1, which can ensure that the flue gas flows into the cavity between the baffle plate and the flue gas outlet 11b1 after exchanging heat with the cold water in the condenser heat exchange tube 2, and then is discharged through the flue gas outlet 11b1.

[0069] For example, the angle between the first inclined outer wall 1111 and the vertical direction is γ, where 2° ≤ γ ≤ 10°. If γ is less than 2°, the inclination angle of the first inclined outer wall 1111 will be too small, and when the condensing heat exchanger is inverted, the condensate accumulated on the first side wall 11a can easily enter the flue duct 112 through the flue gas outlet 1122. If γ is greater than 10°, the length of the smoke inlet structure 111 along the first horizontal direction will increase, thus increasing the space occupied by the condensing heat exchanger in the first horizontal direction. By limiting 2° ≤ γ ≤ 10°, the height of the flue gas outlet 1122 can be raised when the condensing heat exchanger is inverted, making it difficult for the condensate accumulated on the first side wall 11a to enter the flue duct 112 through the flue gas outlet 1122, while ensuring that the length of the smoke inlet structure 111 along the first horizontal direction is not too large. For example, γ = 5°.

[0070] In some embodiments, such as Figure 4 As shown, the flue gas inlet structure 111 has two second inclined outer walls 1112 arranged opposite each other along a second horizontal direction. The distance between the two second inclined outer walls 1112 gradually increases from top to bottom along the second horizontal direction. This arrangement ensures that condensate will not enter the flue gas duct 112 through the flue gas outlet 1122 during the inverted condensing heat exchanger process. It should be noted that the angle between the second inclined outer wall 1112 and the vertical direction can be equal to γ, or it can be different from γ. For example, the angle between the second inclined outer wall 1112 and the vertical direction is equal to γ.

[0071] For example, the baffle plate 114 protrudes from the inner bottom wall of the condenser shell 1, improving the baffle plate 114's blocking effect on the external ambient wind. In particular, when only one smoke baffle plate 113 is provided, and a smoke passage 30 is formed between the lower end of the smoke baffle plate 113 and the inner bottom wall of the condenser shell 1, the baffle plate 114 protrudes from the inner bottom wall of the condenser shell 1, so that the baffle plate 114 has a smoke blocking effect, further extending the flow path of flue gas in the condenser shell 1 and improving the heat exchange effect; moreover, it can also prevent the external ambient wind from flowing from the lower part of the baffle plate 114 to the side of the baffle plate 114 near the smoke inlet structure 111, minimizing the impact of the external environment on the heat exchange effect.

[0072] For example, the baffle 114 is integrally formed on the condenser housing 1, which simplifies the processing of the baffle 114, reduces processing costs, and improves processing efficiency.

[0073] In some embodiments, such as Figures 3 to 6 As shown, a first water guide groove 40 is formed between the smoke inlet structure 111 and the first side wall 11a. A second water guide groove 50 is formed at least one end of the smoke inlet structure 111 in the second horizontal direction and the inner wall of the condenser shell 1 along the second horizontal direction. Along the second horizontal direction, the height of the inner bottom wall of the first water guide groove 40 gradually decreases or remains unchanged. Along the first horizontal direction, the height of the inner bottom wall of the condenser shell 1 located between the smoke inlet structure 111 and the smoke outlet 11b1 gradually decreases. A rain collection chamber 10 is formed between the wind baffle 114 and the second side wall 11b. A drain outlet 11c is provided at the lowest position of the rain collection chamber 10. A condensation heat exchange chamber 20 is formed between the wind baffle 114 and the first side wall 11a. The bottom of the condensation heat exchange chamber 20 is connected to the bottom of the rain collection chamber 10.

[0074] For example, both ends of the smoke inlet structure 111 are spaced apart from the inner wall of the condenser shell 1 along the second horizontal direction, so that a second water guide groove 50 is formed between each end of the smoke inlet structure 111 and the inner wall of the condenser shell 1. One end of the first water guide groove 40 in the second horizontal direction is connected to one of the second water guide grooves 50, and the other end is connected to the other second water guide groove 50.

[0075] Since the height of the inner bottom wall of the condenser shell 1 forming the first water guide trough 40 remains unchanged from one end of the smoke inlet structure 111 near the second water guide trough 50 to the other end of the smoke inlet structure 111, the condensate in the first water guide trough 40 can flow through the second water guide trough 50 to enter the condensation heat exchange chamber 20 between the smoke inlet structure 111 and the baffle plate 114.

[0076] As an alternative, only one second water guide trough 50 can be set. In this case, the height of the inner bottom wall of the condenser shell 1 of the first water guide trough 40 should gradually decrease or remain unchanged from one end of the smoke inlet structure 111 near the second water guide trough 50 to the other end of the smoke inlet structure 111. This is so that the condensate in the first water guide trough 40 can converge towards the end of the first water guide trough 40 near the second water guide trough 50, and then flow through the second water guide trough 50 to the condensation heat exchange chamber 20 between the smoke inlet structure 111 and the baffle plate 114.

[0077] When two second water guide channels 50 are set, the height of the inner bottom wall of the condenser shell 1 forming the first water guide channel 40 can be gradually reduced from one end of the smoke inlet structure 111 near the second water guide channel 50 to the other end of the smoke inlet structure 111. However, at this time only the second water guide channel 50 with the lower height is effective.

[0078] It should be noted that, in order to facilitate processing, when the height of the inner bottom wall of the condenser shell 1 forming the first water guide groove 40 gradually decreases from one end of the smoke inlet structure 111 near the second water guide groove 50 to the other end of the smoke inlet structure 111, the height of the entire inner bottom wall of the condenser shell 1 is usually set to gradually decrease from one end of the smoke inlet structure 111 near the second water guide groove 50 to the other end of the smoke inlet structure 111.

[0079] Because the inner bottom wall of the condenser shell 1 is inclined and the height of the inner bottom wall of the condenser shell 1 gradually decreases from the smoke inlet structure 111 to the smoke outlet 11b1, the condensate in the first water guide groove 40 enters the condensation heat exchange chamber 20 between the smoke inlet structure 111 and the baffle plate 114 through the second water guide groove 50. The condensate accumulated at the bottom of the condensation heat exchange chamber 20 then enters the rain collection chamber 10 and is discharged through the drain outlet 11c, thereby preventing the condensate from accumulating in the condenser shell 1 and enabling the rainwater that flows back into the rain collection chamber 10 to be discharged in time through the drain outlet 11c.

[0080] Specifically, at least one end of the baffle plate 114 is provided with a water passage 80 at intervals along the second horizontal direction and the inner wall of the condenser shell 1, so that the condensate in the condensation heat exchange chamber 20 can enter the rain collection chamber 10 through the water passage 80. For example, the baffle plate 114 has a water passage 80 at one end in the second horizontal direction near the drain outlet 11c, which facilitates the condensate accumulated at the bottom of the condensation heat exchange chamber 20 to enter the rain collection chamber 10 through the water passage 80 and quickly enter the drain outlet 11c. In other embodiments, a water passage hole can also be formed at the bottom of the baffle plate 114 to form the water passage 80.

[0081] Specifically, such as Figure 3As shown, the angle between the inner bottom wall of the condenser shell 1 and the first horizontal direction is α, where α ≤ 3°. In other words, the angle between the vertical direction and the projection of the inner bottom wall of the condenser shell 1 onto a plane perpendicular to the second horizontal direction is 90° - α. For example, α = 1°. It should be noted that α can also be selected as 1.5°, 2°, 2.5°, etc.

[0082] In some embodiments, such as Figure 4 As shown, the angle between the inner bottom wall of the condenser housing 1 and the second horizontal direction is β, where 1° ≤ β ≤ 4°. In other words, the angle between the vertical direction and the projection of the inner bottom wall of the condenser housing 1 onto a horizontal plane perpendicular to the first horizontal direction is 90° - β. For example, β = 2°. By setting the included angles α and β, it is convenient to collect the condensate in the condenser housing 1 towards the location of the drain outlet 11c and discharge it through the drain outlet 11c.

[0083] Because the condensing heat exchanger is equipped with a baffle plate 114, the condensing gas water heater using this condensing heat exchanger can be used as an outdoor water heater.

[0084] In some embodiments, such as Figure 3 As shown, the condenser heat exchange tube 2 includes a plurality of sub-tube sections 21 connected in sequence, and the plurality of sub-tube sections 21 are arranged in at least two rows along the first horizontal direction; along the first horizontal direction, at least one smoke baffle 113 is provided between the smoke outlet 11b1 and the smoke inlet structure 111, and at least one smoke baffle 113 is provided between at least two adjacent rows of sub-tube sections 21.

[0085] By setting up the baffle plate 113, the flow path of flue gas in the condenser shell 1 can be extended, the heat exchange efficiency between the flue gas and the water in the condenser heat exchange tube 2 can be improved, and the water in the condenser heat exchange tube 2 can fully absorb the heat energy in the flue gas.

[0086] For example, one smoke baffle 113 is provided, and multiple sub-tube sections 21 are arranged in three rows along a first horizontal direction. Along the direction from the first sidewall 11a to the second sidewall 11b, multiple tube sections are distributed in a 2, 4, 4 pattern, with multiple sub-tube sections 21 in the same row arranged at intervals from top to bottom. The smoke baffle 113 is located between the rightmost column of tube sections and the adjacent column of sub-tube sections 21. A water inlet and a water outlet are provided on the condenser shell 1, wherein the water inlet and the smoke outlet 11b1 are located on the same side, and the water outlet and the smoke inlet structure 111 are located on the same side. This arrangement helps to maximize the average temperature difference between the latent heat release process of the flue gas and the condenser heat exchange tube 2, maximizing the utilization of the heat energy in the flue gas and improving heat exchange efficiency.

[0087] In other embodiments, such as Figure 8As shown, multiple sub-tube sections 21 can also be arranged in four columns along the first horizontal direction. Along the direction from the first side wall 11a to the second side wall 11b, multiple tube sections are distributed in the order of 1, 3, 3, 3, with the three sub-tube sections 21 in the same column arranged at intervals from top to bottom.

[0088] In some embodiments, such as Figure 3 As shown, a smoke passage 30 is formed between the lower end of the smoke baffle 113 adjacent to the smoke inlet structure 111 and the inner bottom wall of the condensation shell 1, and the top surface of the smoke inlet structure 111 is higher than the smoke passage 30.

[0089] For example, the smoke baffle 113 is provided, and the condensation heat exchange chamber 20 is divided into a first chamber 201 and a second chamber 202 by the smoke baffle 113. The first chamber 201 is formed between the smoke baffle 113 and the first side wall 11a, and the second chamber 202 is formed between the smoke baffle 113 and the wind baffle 114. The first chamber 201 is connected to the second chamber 202 through the smoke passage 30.

[0090] This configuration avoids external ambient wind from entering the condenser shell 1 through the flue outlet 11b1 and then blowing towards the flue gas outlet 1122, thus affecting heat exchange efficiency. It also facilitates the high-temperature flue gas flowing out of the flue gas outlet 1122 to enter the first chamber 201 and flow upward to the condenser heat exchange tube 2, then flow downward to the flue gas passage 30, and enter the second chamber 202 through the flue gas passage 30 to exchange heat with the condenser heat exchange tube 2 in the second chamber 202. It also prevents condensate in the condenser shell 1 from flowing back into the main heat exchanger 5 through the flue 112 when the drain outlet 11c is blocked.

[0091] In some embodiments, such as Figure 3 As shown, a smoke-passing channel 30 is formed between the lower end of the smoke-passing plate 113 adjacent to the wind baffle plate 114 and the inner bottom wall of the condenser shell 1, and the top surface of the wind baffle plate 114 is higher than the smoke-passing channel 30. This arrangement can prevent the hot flue gas in the condenser shell 1 from flowing directly to the smoke outlet 11b1, which helps to extend the path of the hot flue gas in the condenser shell 1, delay the residence time of the hot flue gas in the condenser shell 1, and improve the heat exchange efficiency between the hot flue gas and the water in the condenser heat exchange tube 2.

[0092] In some embodiments, such as Figure 2As shown, the smoke baffle 113 is provided with multiple smoke passage holes 1131, which are arranged in multiple rows along the vertical direction. Each row of smoke passage holes 1131 is spaced apart along the second horizontal direction. This allows the flue gas in the first chamber 201 to enter the second chamber 202 through the smoke passage holes 1131, ensuring sufficient contact between the condenser heat exchange tube 2 in the second chamber 202 and the flue gas, thus improving heat exchange efficiency. For example, three rows of smoke passage holes 1131 are provided. In other embodiments, the smoke baffle 113 and the inner top wall of the condenser shell 1 can be spaced apart, forming smoke passage holes 1131 between the top surface of the smoke baffle 113 and the inner top wall of the condenser shell 1; the smoke passage holes 1131 can also be provided in a single row.

[0093] In some embodiments, such as Figure 6 As shown, the condenser housing 1 has two opposing third sidewalls arranged in a second horizontal direction. Each third sidewall has a mounting protrusion 115, and each mounting protrusion 115 has a slot 1151. The slots 1151 of the two mounting protrusions 115 are arranged opposite each other along the second horizontal direction. Each slot 1151 has an upward-facing support surface. The smoke baffle 113 is aligned with the two slots 1151 one-to-one in the second horizontal direction, and then the smoke baffle 113 is pressed down until it abuts against the support surface. The smoke baffle 113 is then clamped between the bottom walls of the two slots 1151 along the second horizontal direction and supported by the two support surfaces. The installation of the smoke baffle 113 is simple, and disassembly and assembly are convenient and quick.

[0094] Furthermore, the support surface and the inner bottom wall of the condenser shell 1 are arranged such that the smoke baffle 113 is spaced apart from the inner bottom wall of the condenser shell 1 in the vertical direction to form the aforementioned smoke passage 30.

[0095] For example, the mounting protrusion 115 is integrally formed on the condenser housing 1, which simplifies the processing of the mounting protrusion 115, reduces processing costs, and improves processing efficiency.

[0096] In some embodiments, the condenser housing 1 is integrally injection molded using PPS + 30% GF, which simplifies the processing of the condenser housing 1 and enables it to withstand the acid corrosion of weakly acidic condensate at 200°C. It should be noted that PPS refers to Polyphenylene sulfide; GF refers to Glass fiber.

[0097] In some embodiments, such as Figure 3As shown, a thermostat 4 is provided on the top of the condenser housing 1 to monitor the flue gas temperature inside the condenser housing 1. The thermostat 4 is located directly above the flue gas inlet structure 111. It can not only keep the thermostat in a relatively low temperature environment, but also enable the thermostat 4 to quickly identify over-temperature faults when dry burning occurs in each section of the burner and control the water heater to stop running.

[0098] Specifically, the condenser housing 1 includes a condenser box 11 with a top opening and a smoke collection hood 12 connected to the condenser box 11 to seal the top opening, and a thermostat 4 is installed on the smoke collection hood 12.

[0099] In some embodiments, such as Figure 1 and Figure 3 As shown, the heat exchange shell 51 has a top-opening structure. The condenser shell 1 seals the top opening of the heat exchange shell 51, forming a combustion chamber 60 between the condenser shell 1 and the heat exchange shell 51. The heat exchange tube 52 and heat exchange fins 53 are disposed within the combustion chamber 60. The heat insulation cover 6 is connected to the condenser shell 1 and / or the heat exchange shell 51. The heat insulation cover 6 and the condenser base plate 116 are spaced apart and spaced apart from the inner peripheral wall of the condenser shell 1. The top of the heat insulation cover 6 has a flue gas passage 61 directly opposite the flue duct 112. The high-temperature flue gas in the combustion chamber 60 enters the condenser heat exchange chamber 20 through the flue gas passage 61 and the flue duct 112. By setting up the heat insulation cover 6, a heat insulation chamber 70 can be formed between the heat insulation cover 6 and the inner wall of the condenser shell 1 below the condenser base plate 116. The heat insulation chamber 70 is always filled with gas and the gas does not circulate. This reduces the probability of the high-temperature flue gas in the combustion chamber 60 directly contacting the condenser shell 1, preventing the condenser shell 1 from melting at high temperature. This ensures that the thermostat 4 will not fail to accurately identify the heat exchange situation due to the melting and deformation of the condenser shell 1, thus improving the safety performance of the gas water heater.

[0100] For example, the gap between the heat insulation cover 6 and the condenser housing 1 is 2mm-3mm, and the heat insulation cover 6 is an aluminum plate.

[0101] Example 2

[0102] The difference between this embodiment and Embodiment 1 is that: Figures 7 to 10 As shown, condensate baffles 3 are spaced above the flue gas inlet structure 111; the condensate baffles 3 include a baffle body 315 and a first connecting part 316 connected to the end of the baffle body 315 along the second horizontal direction; the baffle body 315 is fixedly installed on the inner side wall of the condensate shell 1 through the first connecting part 316; the upper edge of the baffle body 315 is folded down to form a first flange 311, and the projection of the first flange 311 on the horizontal plane is not within the projection of the flue gas outlet 1122 on the horizontal plane.

[0103] Specifically, the baffle body 315 is connected to a first connecting part 316 at each end in the second horizontal direction. The first connecting part 316 is fastened to the condenser shell 1. From the second side wall 11b to the first side wall 11a, the height of the baffle body 315 gradually decreases, causing the condensate dripping onto the baffle body 315 to slide down to the bottom of the condenser shell 1. Alternatively, the first connecting part 316 can be snapped onto the condenser shell 1, etc.

[0104] To improve the connection stability between the baffle body 315 and the condenser housing 1, in one embodiment, the baffle body 315 is further connected to a second connecting portion 32, which is fastened to the condenser housing 1. Alternatively, the second connecting portion 32 can be snapped onto the condenser housing 1.

[0105] In some embodiments, such as Figure 9 As shown, the angle between the baffle body 315 and the first horizontal direction is A, where 15° ≤ A ≤ 25°. This allows condensate dripping onto the upper surface of the baffle body 315 to slide down to the bottom of the condensation shell 1 under the guiding effect of the baffle body 315, and also reduces the space occupied by the baffle body 315. For example, the angle A between the baffle body 315 and the first horizontal direction is 20°.

[0106] In one embodiment, such as Figure 7 As shown, the upper edge of the baffle body 315 is folded downward to form a first flange 311, and the lower edge of the first flange 311 is closer to the smoke outlet 11b1 along the first horizontal direction than the top surface of the smoke inlet structure 111. This arrangement can prevent condensate dripping onto the upper edge of the baffle body 315 from sliding down to the lower surface of the baffle body 315 and dripping into the flue 112; it can also increase the structural strength of the baffle body 315.

[0107] It should be noted that the width of the first flange 311 is determined according to the thickness of the baffle body 315. In order to reduce the resistance of the condensate baffle 3 to the flue gas flowing out of the flue gas outlet 1122, the baffle body 315 adopts a 0.8mm thick 304 stainless steel structure, and the width of the first flange 311 is selected as 2mm-3mm.

[0108] In one embodiment, the lower side of the baffle body 315 is recessed towards the upper side, forming a baffle protrusion on the upper surface of the baffle body 315. Specifically, the baffle protrusion is formed by stamping, which improves the structural strength of the baffle body 315.

[0109] Example 3

[0110] The difference between this embodiment and Embodiment 1 is that: Figure 11 and Figure 12As shown, condensate baffles 3 are spaced apart above the smoke inlet structure 111; the condensate baffles 3 include two side plates spaced apart relative to each other along the first horizontal direction; a water collection trough 313 with a top opening is formed between the two side plates, and a drip hole 314 is provided at the lowest position of the water collection trough 313, the projection of the drip hole 314 on the horizontal plane is not within the projection of the flue gas outlet 1122 on the horizontal plane; the upper edge of each side plate is folded downwards at an angle away from the other side plate to form a second flange 312, and the flue gas outlet 1122 is located between the lower edges of the two second flanges 312 along the first horizontal direction.

[0111] This configuration allows condensate dripping from the smoke inlet structure 111 to fall into the water collection tank 313 and then drip through the drip hole 314 onto the bottom wall of the condenser shell 1.

[0112] For example, the drip hole 314 is located directly above the second water guide groove 50, and the condensate in the water collection groove 313 drips into the second water guide groove 50 through the drip hole 314.

[0113] For example, the condensate baffle 3 includes two side plates that are spaced apart from each other along a first horizontal direction, and a water collection trough 313 is formed between the two side plates. Along the direction from top to bottom, the distance between the two side plates along the second horizontal direction gradually decreases, so that the condensate dripping onto the inner wall of the side plates can slide down to the bottom of the water collection trough 313, increasing the width of the water collection trough 313 along the second horizontal direction and reducing the probability of condensate splashing out of the water collection trough 313.

[0114] For example, the cross-section of the condensate baffle 3 in the direction perpendicular to the second horizontal direction is a V-shape with the opening facing upwards. It should be noted that the cross-section of the condensate baffle 3 in the direction perpendicular to the second horizontal direction can also be a U-shape with the opening gradually widening.

[0115] In some embodiments, the drip hole 314 is located at one end of the condensate baffle 3 in the second horizontal direction, and the height of the condensate baffle 3 gradually increases from the end where the drip hole 314 is located to the other end of the condensate baffle 3. In other words, the condensate baffle 3 is inclined relative to the second horizontal direction, and the drip hole 314 is located at the lower end of the condensate baffle 3, so that the condensate collected in the water collection tank 313 flows to the side where the drip hole 314 is located.

[0116] In some embodiments, such as Figure 12As shown, the upper edge of each side plate is folded downwards at an angle away from the other side plate to form a second flange 312. The top surface of the smoke inlet structure 111 is located between the lower edges of the two second flanges 312 along the first horizontal direction. This arrangement allows the second flanges 312 to guide condensate dripping onto the edge of the side plate to one side of the smoke inlet structure 111, preventing the condensate dripping onto the edge of the side plate from sliding onto the lower surface of the baffle body 315 and dripping into the flue duct 112 through the flue gas outlet 1122; it also increases the structural strength of the baffle body 315.

[0117] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0118] The specific embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A condensing heat exchanger, characterized in that, include: A condenser shell (1) has a smoke inlet structure (111) protruding from its inner bottom. A flue (112) is provided on the smoke inlet structure (111). The lower end of the flue (112) penetrates the bottom wall of the condenser shell (1) to form a flue gas inlet (1121). The upper end of the flue (112) penetrates the upper surface of the smoke inlet structure (111) to form a flue gas outlet (1122). A condenser heat exchange tube (2) is provided in the condenser shell (1) for heat exchange. A condensate baffle (3) is fixedly installed inside the condenser housing (1); the condensate baffle (3) is located above the flue gas outlet (1122) and is used to prevent the condensate from the condenser heat exchange tube (2) from dripping into the flue gas outlet (1122).

2. The condensation heat exchanger according to claim 1, characterized in that, The fixed end of the condensate baffle (3) is connected to the top of the smoke inlet structure (111) along the second horizontal direction, and the free end of the condensate baffle (3) is inclined upward.

3. The condensation heat exchanger according to claim 1, characterized in that, The condensate baffles (3) are spaced apart above the smoke inlet structure (111); the condensate baffles (3) include a baffle body (315) and a first connecting part (316) connected to the end of the baffle body (315) along the second horizontal direction; the baffle body (315) is fixedly installed on the inner side wall of the condensate shell (1) through the first connecting part (316); the upper edge of the baffle body (315) is folded down to form a first flange (311), and the projection of the first flange (311) on the horizontal plane is not within the projection of the flue gas outlet (1122) on the horizontal plane.

4. The condensation heat exchanger according to claim 1, characterized in that, The condensate baffles (3) are spaced apart above the smoke inlet structure (111); the condensate baffles (3) include two side plates (31) spaced apart from each other along the first horizontal direction; a water collection trough (313) with a top opening is formed between the two side plates (31), and a drip hole (314) is provided at the lowest position of the water collection trough (313), and the projection of the drip hole (314) on the horizontal plane is not within the projection of the flue gas outlet (1122) on the horizontal plane; the upper edge of each side plate (31) is folded downwards at an angle away from the other side plate (31) to form a second flange (312), and the flue gas outlet (1122) is located between the lower edges of the two second flanges (312) along the first horizontal direction.

5. The condensing heat exchanger according to any one of claims 1-4, characterized in that, The condenser housing (1) includes a first sidewall (11a) and a second sidewall (11b) arranged opposite to each other along a first horizontal direction. The smoke inlet structure (111) is spaced apart from the first sidewall (11a) along the first horizontal direction. The second sidewall (11b) is provided with a smoke outlet (11b1).

6. The condensation heat exchanger according to claim 5, characterized in that, The condenser shell (1) is provided with a baffle plate (114), which is located between the condenser heat exchange tube (2) and the second side wall (11b); The baffle plate (114) has a first end (1141) and a second end (1142) arranged opposite to each other along a second horizontal direction. The smoke outlet (11b1) is located between the first end (1141) and the second end (1142) along the second horizontal direction. The condensing heat exchange tube (2) is located on the side of the baffle plate (114) away from the smoke outlet (11b1). The top surface of the baffle plate (114) is higher than the lowest point of the smoke outlet (11b1) and the lower end of the baffle plate (114) is lower than the lowest point of the smoke outlet (11b1). Along the first horizontal direction, the first end (1141) is spaced apart from the inner wall of the condenser shell (1); the second end (1142) is connected to the inner wall of the condenser shell (1) in the vertical direction; the first horizontal direction and the second horizontal direction are perpendicular.

7. The condensation heat exchanger according to claim 6, characterized in that, A first water guide groove (40) is formed between the first sidewall (11a) and the smoke inlet structure (111). Along the second horizontal direction, the height of the inner bottom wall of the first water guide groove (40) gradually decreases or remains unchanged. Along the second horizontal direction, a second water guide groove (50) is formed at least one end of the smoke inlet structure (111) and the inner wall of the condenser shell (1) at intervals. Along the first horizontal direction, the height of the inner bottom wall of the condenser shell (1) located between the smoke inlet structure (111) and the smoke outlet (11b1) gradually decreases. A rain collection chamber (10) is formed between the wind baffle (114) and the second side wall (11b). A drain outlet (11c) is provided at the lowest position of the rain collection chamber (10). A condensation heat exchange chamber (20) is formed between the wind baffle (114) and the first side wall (11a). The bottom of the condensation heat exchange chamber (20) is connected to the bottom of the rain collection chamber (10).

8. The condensation heat exchanger according to claim 6, characterized in that, The condenser heat exchange tube (2) includes a plurality of sub-tube sections (21) connected in sequence, and the plurality of sub-tube sections (21) are arranged in at least two columns along a first horizontal direction; Along the first horizontal direction, at least one smoke baffle (113) is provided between the smoke outlet (11b1) and the smoke inlet structure (111), and the smoke baffle (113) is provided between at least two adjacent rows of the sub-tubes (21); A smoke passage (30) is formed between the lower end of the smoke baffle (113) adjacent to the smoke inlet structure (111) and the inner bottom wall of the condensation shell (1), and the top surface of the smoke inlet structure (111) is higher than the smoke passage (30); and / or, a smoke passage (30) is formed between the lower end of the smoke baffle (113) adjacent to the wind baffle (114) and the inner bottom wall of the condensation shell (1), and the top surface of the wind baffle (114) is higher than the smoke passage (30).

9. The condensation heat exchanger according to claim 5, characterized in that, The cross-sectional area of ​​the flue (112) gradually decreases along the flue gas flow direction, and the ratio of the minimum cross-sectional area of ​​the flue (112) to the cross-sectional area of ​​the flue outlet (11b1) is Q, where 1 < Q ≤ 1.

2.

10. A condensing gas-fired water heater, characterized in that, Includes a main heat exchanger (5) and a condensing heat exchange device as described in any one of claims 1 to 9, wherein the main heat exchanger (5) includes a heat exchange shell (51) located below the condensing shell (1), and the inner cavity of the heat exchange shell (51) is connected to the inner cavity of the condensing shell (1) through the flue (112).

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