Condensation type gas water heater

Abstract

The utility model discloses a condensation type gas water heater, and relates to the technical field of water heaters. The condensation type gas water heater comprises a combustion heat exchange assembly, a fan, a condensation heat exchange assembly and a smoke guide structure, the combustion heat exchange assembly comprises a combustor and a main heat exchanger, the main heat exchanger is arranged above the combustor, and a gas inlet and a smoke outlet are formed in the upper side and the lower side of the combustion heat exchange assembly respectively; the fan is mounted at an air inlet of the combustion heat exchange assembly; the condensation heat exchange assembly is arranged on the side portion of the combustion heat exchange assembly and provided with a smoke inlet and a smoke outlet. The smoke guide structure communicates with the smoke outlet and the smoke inlet so that smoke flowing out of the smoke outlet can enter the condensation heat exchange assembly from the smoke inlet after being turned once. According to the technical scheme, the flue gas emission resistance can be reduced, and the noise of the whole machine is reduced.

Description

Technical Field

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

[0002] After a single heat exchange, a conventional gas water heater typically produces medium-temperature flue gas at around 180℃. This flue gas has a high content of CO2 and NOx, and also contains water vapor with a high heat energy content. Direct emission of this gas not only pollutes the environment but also results in a significant loss of heat energy. To avoid environmental pollution and heat energy waste caused by direct flue gas emission, condensing gas water heaters have been developed. Condensing gas water heaters use a condensing heat exchanger for secondary heat exchange, preheating the water, recovering the latent heat of the medium-temperature flue gas, improving the utilization rate of the gas, and significantly reducing the temperature of the flue gas discharged from the unit.

[0003] In related technologies, the condensing heat exchanger in a condensing gas water heater is located directly above the main heat exchanger. Since the condensing heat exchanger produces condensate, in order to prevent the condensate from dripping onto the main heat exchanger, a water collection structure or baffle structure is usually installed between the condensing heat exchanger and the main heat exchanger. This will result in excessive resistance to flue gas emission, which is not conducive to flue gas emission, and will cause the fan speed to increase, resulting in greater noise. Utility Model Content

[0004] The main purpose of this invention is to propose a condensing gas water heater that aims to reduce flue gas emission resistance and overall noise.

[0005] To achieve the above objectives, the present invention proposes a condensing gas water heater, comprising:

[0006] A combustion heat exchange assembly includes a burner and a main heat exchanger, wherein the main heat exchanger is located above the burner, and the combustion heat exchange assembly has an air inlet and a smoke outlet on its upper and lower sides, respectively.

[0007] A fan is installed at the air inlet of the combustion heat exchange assembly;

[0008] A condensing heat exchange component is disposed on the side of the combustion heat exchange component, the condensing heat exchange component having a flue gas inlet and a flue gas outlet; and

[0009] A smoke guiding structure connects the smoke outlet and the smoke inlet, so that the flue gas flowing out of the smoke outlet enters the condensation heat exchange component through the smoke inlet after making a bend.

[0010] In one embodiment of this application, the smoke guiding structure is disposed above the combustion heat exchange assembly, the condensation heat exchange assembly is disposed above and to the side of the combustion heat exchange assembly, and the orientation of the smoke outlet is perpendicular to the orientation of the smoke inlet.

[0011] In one embodiment of this application, the smoke guiding structure includes a smoke collection hood, a guide section, and a connecting smoke pipe connected sequentially along the flue gas flow direction. The smoke collection hood is connected to the smoke outlet of the combustion heat exchange component, and the connecting smoke pipe is connected to the smoke inlet of the condensation heat exchange component.

[0012] The inner wall of the guide section is a smooth surface.

[0013] In one embodiment of this application, the guide section is inclined on the wall opposite to the smoke outlet so that the smoke flowing out of the smoke outlet is reflected to the smoke inlet via the inclined surface.

[0014] In one embodiment of this application, the inner wall of the guide segment further includes:

[0015] A first guide surface connects the smoke collection hood and the inclined surface, and the extending direction of the first guide surface is consistent with the orientation of the smoke outlet; and

[0016] The second guide surface connects the inclined surface and the connecting flue, and the extension direction of the second guide surface is consistent with the orientation of the flue inlet;

[0017] Wherein, the first guide surface and / or the second guide surface are connected to the inclined surface with rounded corners.

[0018] In one embodiment of this application, the smoke hood is riveted to the guide section;

[0019] And / or, the connecting flue is riveted to the guide section.

[0020] In one embodiment of this application, the condensation heat exchange assembly includes:

[0021] Condensing heat exchanger;

[0022] A flue gas inlet pipe is located on the side of the condensing heat exchanger, the inlet of the flue gas inlet pipe is the flue gas inlet, and the connecting flue gas pipe is inserted and fixed to the flue gas inlet pipe; and

[0023] The exhaust pipe is located at the top of the condensing heat exchanger and extends out of the condensing gas water heater. The outlet of the exhaust pipe is the exhaust port.

[0024] In one embodiment of this application, a sealing ring is provided between the connecting flue and the inlet flue.

[0025] In one embodiment of this application, the exhaust pipe is provided with an anti-backdraft device for unidirectional exhaust of smoke from the inside to the outside.

[0026] In one embodiment of this application, the condensing gas water heater further includes a casing, and the combustion heat exchange component, the fan, the condensing heat exchange component, and the smoke guide structure are all disposed within the casing;

[0027] The condensing heat exchange component has a gap D between itself and the inner wall of the casing, satisfying: 1mm≤D≤2mm; and / or, sound insulation cotton is provided between the top wall of the condensing heat exchange component and the top inner wall of the casing.

[0028] In this utility model's condensing gas water heater, the combustion heat exchange component includes a burner and a main heat exchanger positioned above the burner. The combustion heat exchange component has an air inlet and a flue gas outlet on its upper and lower sides, respectively. A fan is installed at the air inlet of the combustion heat exchange component, allowing the flue gas within the component to flow upwards. By placing the condensing heat exchange component on the side of the combustion heat exchange component and connecting the flue gas outlet of the combustion heat exchange component with the flue gas inlet of the condensing heat exchange component via a flue gas guiding structure, the flue gas flowing from the outlet enters the condensing heat exchange component through the inlet after a single bend for secondary heat exchange. Compared to placing the condensing heat exchange component directly above the main heat exchanger, this embodiment facilitates the discharge of condensate and reduces resistance to flue gas emission, resulting in smoother flue gas flow and effectively reducing system noise. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of an embodiment of the condensing gas water heater of this utility model;

[0031] Figure 2 This is a schematic diagram of the assembly structure of the combustion heat exchange component, the smoke guiding structure, and the condensation heat exchange component in the embodiments of this utility model;

[0032] Figure 3 for Figure 2 Longitudinal cross-sectional view of the embodiment;

[0033] Figure 4 This is a schematic diagram of the smoke guiding structure in an embodiment of the present utility model;

[0034] Figure 5 for Figure 4 Longitudinal cross-sectional view of the embodiment;

[0035] Figure 6 This is a schematic diagram of the condensation heat exchange component in an embodiment of the present invention;

[0036] Figure 7 This is a top view of the condensation heat exchange component in an embodiment of this utility model.

[0037] Explanation of icon numbers:

[0038]

[0039]

[0040] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0042] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0043] Meanwhile, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three options. Taking "A and / or B" as an example, it includes option A, option B, or an option that satisfies both A and B.

[0044] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0045] Condensing gas water heaters include forced-extraction and forced-blowing types. In some forced-extraction water heaters, the fan is located above the main heat exchanger, and the condensing heat exchanger is located to the side of the fan, meaning the fan is positioned between the main and condensing heat exchangers. This fan draws the flue gas flowing through the main heat exchanger and delivers it to the condensing heat exchanger for secondary heat exchange. However, because forced-extraction water heaters use negative pressure for air extraction, the negative pressure environment may lead to incomplete combustion and the production of more harmful substances. In forced-blowing water heaters, the fan is located below the main heat exchanger, using positive pressure to provide combustion air more effectively and improve combustion efficiency. However, in this type of unit, the condensing heat exchanger is usually located directly above the main heat exchanger. Since the condensing heat exchanger produces condensate, a water collection structure or baffle is usually installed between the condensing and main heat exchangers to prevent condensate from dripping onto the main heat exchanger. This results in excessive resistance to flue gas emission, hindering flue gas discharge and causing the fan speed to increase, leading to greater noise.

[0046] Based on this, this utility model proposes a condensing gas water heater, aiming to improve the internal structure of a forced-draft water heater, reduce flue gas emission resistance, and reduce system noise. The structure of the condensing gas water heater will be described below with examples.

[0047] like Figures 1 to 5 As shown, the condensing gas water heater includes a combustion heat exchange component 1, a fan 2, a condensing heat exchange component 3, and a smoke guiding structure 4.

[0048] The combustion heat exchange assembly 1 includes a burner 11 and a main heat exchanger 12, with the main heat exchanger 12 located above the burner 11. The combustion heat exchange assembly 1 has an air inlet 101 and a flue gas outlet 102 on its upper and lower sides, respectively. A fan 2 is installed at the air inlet 101 of the combustion heat exchange assembly 1. A condensing heat exchange assembly 3 is located on the side of the combustion heat exchange assembly 1, and has a flue gas inlet 301 and a flue gas outlet 302. A flue gas guiding structure 4 connects the flue gas outlet 102 and the flue gas inlet 301, so that the flue gas flowing out of the flue gas outlet 102 enters the condensing heat exchange assembly 3 through the flue gas inlet 301 after making a bend.

[0049] In this embodiment, the fan 2 is installed at the air inlet 101 of the combustion heat exchange assembly 1. The combustion heat exchange assembly 1 includes a burner 11 and a main heat exchanger 12. The main heat exchanger 12 is located above the burner 11. It can be understood that the fan 2 is located below the burner 11. It is used to blow external air into the interior of the combustion heat exchange assembly 1 to mix with the gas and be burned by the burner 11. It drives the high-temperature flue gas generated by the combustion of the burner 11 to flow upward to the main heat exchanger 12 for primary heat exchange. After primary heat exchange, the flue gas flows through the smoke guide structure 4 to the condensation heat exchange assembly 3 for secondary heat exchange and is then discharged from the exhaust port 302. In this way, the temperature of the flue gas after secondary heat exchange is lower, which improves the heat utilization rate.

[0050] By setting the condensing heat exchange component 3 on the side of the combustion heat exchange component 1, and using the smoke guide structure 4 to connect the smoke outlet 102 with the smoke inlet 301 of the condensing heat exchange component 3, the flue gas from the smoke outlet 102 can be guided to the condensing heat exchange component 3 on the side through the smoke guide structure 4. Compared with the related technology that sets the condensing heat exchange component 3 directly above the combustion heat exchange component 1, this method can make full use of the space on the side of the combustion heat exchange component 1 inside the casing 7, making the overall layout more compact and reducing the overall size. On the other hand, it is easier to discharge condensate and also prevents condensate from dripping into the main heat exchanger 12 without the need for additional water collection structures or baffles. Furthermore, the smoke guiding structure 4 is used to guide the airflow through its inner cavity by a single bend. That is, the flue gas flowing out of the smoke outlet 102 only makes one bend before flowing to the smoke inlet 301 of the condensing heat exchange component 3. Compared with the structure with multiple bends in related technologies, this embodiment reduces the resistance to flue gas emission, making the flue gas flow more smoothly without having to increase the speed of the fan 2. Thus, under the same flue gas emission efficiency, this embodiment can effectively reduce system noise.

[0051] It should be noted that the single-turn guidance of the smoke guide structure 4 in this embodiment can be understood as the smoke flowing out along the direction of the smoke outlet 102 turning and changing direction once to align with the direction of the smoke inlet 301. In practical applications, to further reduce the resistance to smoke emission, the turning angle of the single-turn guidance via the smoke guide structure 4 can be selected to be no more than 100°, and approximately around 90°. This setting allows for smaller changes in the smoke flow angle, which is more conducive to circulation. The specific structure of the smoke guide structure 4 can also be determined according to the actual situation, such as a pipe structure, a box structure, or some irregular structures.

[0052] In practical applications, the specific location of the condensing heat exchange component 3 can be determined according to the actual situation. For example, the condensing heat exchange component 3 can be located to the side, above, below, in front of, or behind the combustion heat exchange component 1. For example, the condensing heat exchange component 3 can be located on the side of the main heat exchanger 12, or it can be located above the main heat exchanger 12. As long as the flue gas guiding structure 4 only needs to guide the airflow by one bend when connecting the flue gas outlet 102 and the flue gas inlet 301, the condensing heat exchange component 3 can be a tube-fin heat exchanger, a plate heat exchanger, or some other type of heat exchanger. The condensing heat exchange component 3 can have the same or different structural type as the main heat exchanger 12.

[0053] Understandably, in the flue gas system of the water heater, the condensing heat exchange component 3 is located downstream of the main heat exchanger 12. However, in the water circuit system of the water heater, the condensing heat exchange component 3 can be located upstream of the main heat exchanger 12. Specifically, the water inlet pipe 801 of the water heater can be connected to the inlet of the condensing heat exchange component 3, and the water outlet pipe 803 of the water heater can be connected to the outlet of the main heat exchanger 12. Cold water first flows through the condensing heat exchange component 3 for preheating, and then flows through the connecting pipe 802 to the main heat exchanger 12 for further heating. Finally, it flows out from the water outlet pipe 803 to the water user. This arrangement improves heat exchange efficiency and increases heat utilization. Of course, in some other embodiments, the condensing heat exchange component 3 can also be located downstream of the main heat exchanger 12.

[0054] In summary, in the condensing gas water heater of this utility model, the combustion heat exchange component 1 includes a burner 11 and a main heat exchanger 12 disposed above the burner 11. The combustion heat exchange component 1 has an air inlet 101 and a flue gas outlet 102 on its upper and lower sides, respectively. A fan 2 is installed at the air inlet 101 of the combustion heat exchange component 1, allowing the flue gas inside the combustion heat exchange component 1 to flow upwards. By placing the condensing heat exchange component 3 on the side of the combustion heat exchange component 1 and connecting the flue gas outlet 102 of the combustion heat exchange component 1 with the flue gas inlet 301 of the condensing heat exchange component 3 through a smoke guiding structure 4, the flue gas flowing out from the flue gas outlet 102 enters the condensing heat exchange component 3 through the flue gas inlet 301 after a single bend for secondary heat exchange. Compared to placing the condensing heat exchange component 3 directly above the main heat exchanger 12, this embodiment facilitates the discharge of condensate and reduces the resistance to flue gas emission, resulting in smoother flue gas flow and effectively reducing system noise.

[0055] Please see Figures 1 to 4 In one embodiment of this application, the smoke guiding structure 4 is disposed above the combustion heat exchange assembly 1, the condensation heat exchange assembly 3 is disposed on the side above the combustion heat exchange assembly 1, and the orientation of the smoke outlet 102 is perpendicular to the orientation of the smoke inlet 301.

[0056] Understandably, the fan 2 is located below the combustion heat exchange assembly 1, and the flue gas in the combustion heat exchange assembly 1 flows from bottom to top. By setting the smoke guide structure 4 above the combustion heat exchange assembly 1, the flue gas entering the smoke guide structure 4 from the smoke outlet 102 can flow in the direction of the smoke outlet 102, that is, the flue gas entering the smoke guide structure 4 from the smoke outlet 102 flows from bottom to top, reducing the resistance of the flue gas when it enters the smoke guide structure 4 from the combustion heat exchange assembly 1. Meanwhile, by setting the condensing heat exchange component 3 on the side above the combustion heat exchange component 1, the condensing heat exchange component 3 is located on the side of the smoke guiding structure 4, and the orientation of the smoke outlet 102 is perpendicular to the orientation of the smoke inlet 301. This allows the flue gas entering the smoke guiding structure 4 from the smoke outlet 102 to flow to the smoke inlet 301 after approximately a 90° bend, and then enter the condensing heat exchange component 3 along the direction of the smoke inlet 301 for secondary heat exchange. This reduces the flow resistance of the flue gas, improves the smoothness of the flue gas flow, and thus reduces the overall noise of the system.

[0057] As an example, taking a water heater installed on a wall and operating normally, when facing the water heater, the smoke guide structure 4 is positioned above the combustion heat exchange component 1, with the smoke outlet 102 facing upwards. The condensing heat exchange component 3 is located to the upper right of the combustion heat exchange component 1, and the smoke inlet 301 faces to the left. This design, with the condensing heat exchange component 3 offset from the combustion heat exchange component 1, utilizes the space on the side of the combustion heat exchange component 1 within the casing 7, resulting in a more compact structural layout and facilitating the drainage of condensate.

[0058] Please see Figures 1 to 5 In one embodiment of this application, the smoke guiding structure 4 includes a smoke collection hood 41, a guide section 42, and a connecting smoke pipe 43 connected sequentially along the flue gas flow direction. The smoke collection hood 41 is connected to the smoke outlet 102 of the combustion heat exchange component 1, and the connecting smoke pipe 43 is connected to the smoke inlet 301 of the condensation heat exchange component 3. The inner wall of the guide section 42 is a smooth surface.

[0059] This embodiment illustrates the specific structure of the smoke guiding structure 4. The smoke collection hood 41 is connected to the smoke outlet 102 of the combustion heat exchange component 1, serving to collect and guide the flue gas within the combustion heat exchange component 1. It is understood that, to ensure good heat exchange efficiency, the combustion heat exchange component 1 is typically designed with a sufficiently wide width to guarantee the combustion space within the combustion chamber. Optionally, the smoke collection hood 41 can adopt an inverted funnel-shaped structure. The outlet of the smoke collection hood 41 is located on the top wall of the smoke collection hood 41 and connected to the guide section 42, allowing the flue gas to flow into the guide section 42 from bottom to top. The guide section 42 serves to redirect the flue gas flow, causing the flue gas flowing from bottom to top to turn and enter laterally into the connecting smoke pipe 43. The connecting smoke pipe 43 is connected to the smoke inlet 301 of the condensing heat exchange component 3, allowing the flue gas to enter laterally into the condensing heat exchange component 3 for secondary heat exchange.

[0060] In this embodiment, the inner wall of the guide section 42 is a smooth surface. Compared with the abrupt structural surface or the edge-corner structural surface used in related technologies, the smooth surface in this embodiment can avoid airflow turbulence caused by abrupt changes in cross-section, and can better guide airflow and reduce smoke exhaust resistance. The smooth inner wall of the guide section 42 means that, in addition to the smoothness of some of its own guide surfaces, the connections between different guide surfaces are also smoothly transitioned, such as with rounded corners.

[0061] Optionally, the method of fixing the smoke hood 41 and the guide section 42 can be determined according to the actual situation, such as welding, bonding, snap-fitting, riveting, or other fixing methods. In this embodiment, considering the convenience of assembly and sealing, it is preferred to fix the smoke hood 41 and the guide section 42 by riveting.

[0062] Optionally, the fixing method between the smoke pipe 43 and the guide section 42 can be determined according to the actual situation, such as welding, bonding, snap-fitting, riveting, or other fixing methods. In this embodiment, considering the convenience of assembly and sealing, it is preferable to fix the smoke pipe 43 and the guide section 42 by riveting.

[0063] Please see Figures 1 to 5 In one embodiment of this application, the guide section 42 is provided with an inclined surface 421 opposite to the smoke outlet 102 so that the smoke flowing out of the smoke outlet 102 is reflected to the smoke inlet 301 via the inclined surface 421.

[0064] In this embodiment, by setting the wall surface opposite to the smoke outlet 102 of the guide section 42 as an inclined surface 421, the flue gas entering the guide section 42 from the outlet of the smoke hood 41 can be directly blown onto the inclined surface 421. Through the blocking and reflection effect of the inclined surface 421, the flue gas is turned and diverted to the connecting smoke pipe 43 flowing to the side, and finally flows into the condensing heat exchange assembly 3 from the smoke inlet 301.

[0065] Understandably, the projection shape of the inclined surface 421 onto the cross section of the guide segment 42 along the vertical direction is a diagonal line shape inclined in the vertical direction. Optionally, the inclination angle of the inclined surface 421 relative to the vertical direction can be between 30° and 60°. For better reversal effect, the inclination angle of the inclined surface 421 relative to the vertical direction can be approximately 45°.

[0066] Further, please refer to Figures 1 to 5The inner wall of the guide section 42 also includes a first guide surface 422 and a second guide surface 423. The first guide surface 422 connects the smoke collection hood 41 and the inclined surface 421, and the extension direction of the first guide surface 422 is consistent with the orientation of the smoke outlet 102. The second guide surface 423 connects the inclined surface 421 and the connecting smoke pipe 43, and the extension direction of the second guide surface 423 is consistent with the orientation of the smoke inlet 301. The first guide surface 422 and / or the second guide surface 423 are connected to the inclined surface 421 with rounded corners.

[0067] In this embodiment, the first guide surface 422 guides the flue gas in the fume hood 41 to the inclined surface 421. By setting the extension direction of the first guide surface 422 to be consistent with the orientation of the flue gas outlet 102, the flue gas can flow from bottom to top to the inclined surface 421, avoiding flue gas reversal and reducing flue gas resistance. After the flue gas reverses direction at the inclined surface 421, by aligning the extension direction of the second guide surface 423 with the orientation of the flue gas inlet 301, the second guide surface 423 can guide the flue gas laterally (facing the water heater, the flue gas flows from left to right) into the connecting flue pipe 43, and then into the condensing heat exchange assembly 3. Thus, the number of flue gas reversals can be reduced, and the flue gas emission smoothness can be improved.

[0068] Optionally, the first guide surface 422 and the inclined surface 421 are connected with rounded corners. This arrangement can reduce the resistance to flue gas flow and improve the smoothness of flue gas emission.

[0069] Optionally, the inclined surface 421 and the second guide surface 423 are connected with rounded corners. This arrangement can reduce the resistance to flue gas flow and improve the smoothness of flue gas emission.

[0070] As an example, taking a water heater installed on a wall and working normally as an example, when facing the water heater, the longitudinal section of the inner wall of the guide section 42 is roughly trapezoidal in shape, wherein the left side wall and the right side wall are the upper and lower bases of the trapezoid, and the inclined surface 421 is the waist of the trapezoid.

[0071] Please see Figures 1 to 6 In one embodiment of this application, the condensing heat exchange assembly 3 includes a condensing heat exchanger 31, a flue pipe 32, and a flue pipe 33. The flue pipe 32 is located on the side of the condensing heat exchanger 31, and the inlet of the flue pipe 32 is a flue inlet 301. The connecting pipe 43 is inserted and fixed to the flue pipe 32. The flue pipe 33 is located on the top of the condensing heat exchanger 31 and extends out of the condensing gas water heater. The outlet of the flue pipe 33 is a flue outlet 302.

[0072] In this embodiment, the condenser heat exchanger 31 serves to perform secondary heat exchange on the flue gas and preheat the inlet water. Optionally, the condenser heat exchanger 31 has multiple heat exchange tubes inside. The inlet of the condenser heat exchanger 31 is connected to the inlet water pipe 801, and the outlet is connected to the inlet of the main heat exchanger 12 through the connecting pipe 802. The outlet of the main heat exchanger 12 is connected to the outlet water pipe 803. The cold water is preheated by the condenser heat exchanger 31 before flowing into the main heat exchanger 12. The flue gas inlet pipe 32 is connected to the connecting flue gas pipe 43, allowing the flue gas in the flue gas guide structure 4 to smoothly enter the condenser heat exchanger 31. Optionally, the flue gas inlet pipe 32 is fitted over the connecting flue gas pipe 43 to prevent flue gas leakage from the gap between the two. Optionally, the flue gas inlet pipe 32 and the connecting flue gas pipe 43 can be directly press-fit sealed, or a sealing ring 5 can be used for sealing to ensure the airtightness of the flue gas emission. The exhaust pipe 33 is located at the top of the condensing heat exchanger 31 and extends out of the condensing gas water heater, so that the exhaust gas inside the gas water heater can be discharged to the outside.

[0073] Please see Figure 7 In one embodiment of this application, the exhaust pipe 33 is provided with an anti-backdraft device 6 for unidirectional exhaust of smoke from the inside to the outside. Optionally, the anti-backdraft device 6 can be a one-way air valve to prevent cold air from entering the machine and reduce the risk of water pipe freezing and cracking.

[0074] Please see Figures 1 to 3 In one embodiment of this application, the condensing gas water heater further includes a casing 7, and the combustion heat exchange component 1, the fan 2, the condensing heat exchange component 3 and the smoke guiding structure 4 are all disposed inside the casing 7; there is a gap D between the top wall of the condensing heat exchange component 3 and the top inner wall of the casing 7, which satisfies: 1mm≤D≤2mm.

[0075] Understandably, taking a water heater installed on a wall and operating normally as an example, when facing the water heater, the condensing heat exchange component 3 is located to the upper right of the main heat exchanger 12. Flue gas passes through the combustion heat exchange component 1, the smoke guiding structure 4, and the condensing heat exchange component 3 before being discharged from the exhaust pipe 33. Optionally, the exhaust pipe 33 extends out of the casing 7 through the top inner wall of the casing 7. By setting the gap D between the top wall of the condensing heat exchange component 3 and the top inner wall of the casing 7 to satisfy 1mm ≤ D ≤ 2mm, the leakage of internal combustion and fan 2 noise can be effectively blocked, reducing the overall noise of the water heater. Optionally, the gap D between the top wall of the condensing heat exchange component 3 and the top inner wall of the casing 7 can be selected as 1mm, 1.1mm, 1.2mm, 1.3mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, or 2.0mm, etc.

[0076] To further reduce overall machine noise, in one embodiment of this application, sound insulation cotton is provided between the top wall of the condensing heat exchange component 3 and the top inner wall of the casing 7 to prevent internal sound from propagating outward.

[0077] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A condensing gas water heater, characterized in that, include: A combustion heat exchange assembly includes a burner and a main heat exchanger, wherein the main heat exchanger is located above the burner, and the combustion heat exchange assembly has an air inlet and a smoke outlet on its upper and lower sides, respectively. A fan is installed at the air inlet of the combustion heat exchange assembly; A condensing heat exchange component is disposed on the side of the combustion heat exchange component, the condensing heat exchange component having a flue gas inlet and a flue gas outlet; and A smoke guiding structure connects the smoke outlet and the smoke inlet, so that the flue gas flowing out of the smoke outlet enters the condensation heat exchange component through the smoke inlet after making a bend.

2. The condensing gas water heater as described in claim 1, characterized in that, The smoke guiding structure is disposed above the combustion heat exchange assembly, the condensation heat exchange assembly is disposed above and to the side of the combustion heat exchange assembly, and the orientation of the smoke outlet is perpendicular to the orientation of the smoke inlet.

3. The condensing gas water heater as described in claim 2, characterized in that, The smoke guiding structure includes a smoke collection hood, a guide section, and a connecting smoke pipe connected in sequence along the flue gas flow direction. The smoke collection hood is connected to the smoke outlet of the combustion heat exchange component, and the connecting smoke pipe is connected to the smoke inlet of the condensation heat exchange component. The inner wall of the guide section is a smooth surface.

4. The condensing gas water heater as described in claim 3, characterized in that, The guide section is inclined to the wall opposite the smoke outlet so that the smoke flowing out of the smoke outlet is reflected to the smoke inlet by the inclined surface.

5. The condensing gas water heater as described in claim 4, characterized in that, The inner wall of the guide section also includes: A first guide surface connects the smoke collection hood and the inclined surface, and the extending direction of the first guide surface is consistent with the orientation of the smoke outlet; and The second guide surface connects the inclined surface and the connecting flue, and the extension direction of the second guide surface is consistent with the orientation of the flue inlet; Wherein, the first guide surface and / or the second guide surface are connected to the inclined surface with rounded corners.

6. The condensing gas water heater as described in claim 3, characterized in that, The smoke collection hood is riveted and fixed to the guide section; And / or, the connecting flue is riveted to the guide section.

7. The condensing gas water heater as described in any one of claims 3 to 6, characterized in that, The condensation heat exchange assembly includes: Condensing heat exchanger; A flue gas inlet pipe is located on the side of the condensing heat exchanger, the inlet of the flue gas inlet pipe is the flue gas inlet, and the connecting flue gas pipe is inserted and fixed to the flue gas inlet pipe; and The exhaust pipe is located at the top of the condensing heat exchanger and extends out of the condensing gas water heater. The outlet of the exhaust pipe is the exhaust port.

8. The condensing gas water heater as described in claim 7, characterized in that, A sealing ring is provided between the connecting flue and the inlet flue.

9. The condensing gas water heater as described in claim 7, characterized in that, The exhaust pipe is equipped with a backdraft prevention device for unidirectional exhaust of smoke from the inside out.

10. The condensing gas water heater as described in any one of claims 1 to 6, characterized in that, The condensing gas water heater also includes a casing, and the combustion heat exchange component, the fan, the condensing heat exchange component and the smoke guide structure are all disposed inside the casing; The condensing heat exchange component has a gap D between itself and the inner wall of the casing, satisfying: 1mm≤D≤2mm; and / or, sound insulation cotton is provided between the top wall of the condensing heat exchange component and the top inner wall of the casing.

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