Water heater

Abstract

The utility model discloses a water heater, which relates to the technical field of heat exchange, and comprises a burner, a water tank and a water tank, the heat exchanger is located below the combustor, the heat exchanger comprises a main heat exchange assembly and a condensation heat exchange assembly which are arranged from top to bottom, and the condensation heat exchange assembly is of a tubular heat exchange structure; the smoke exhaust device is provided with a smoke collecting cavity opened towards the heat exchanger and a smoke exhaust port communicated with the smoke collecting cavity, the smoke collecting cavity is used for collecting smoke subjected to heat exchange through the heat exchanger and condensate water generated by the heat exchanger, and the smoke exhaust port is used for exhausting the smoke in the smoke collecting cavity; and the fan is used for driving airflow to flow from the combustor to the smoke exhaust device through the heat exchanger. According to the technical scheme, two-stage heat exchange of the water heater can be achieved, the assembly structure of the water heater can be simplified, the risk of condensate water blockage is reduced, and the heat exchange efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange, in particular to a water heater. Background Art

[0002] In the context of energy conservation and emission reduction, improving the energy efficiency of gas water heaters has become a trend in the industry. To improve energy efficiency, it is necessary to use the latent heat of flue gas vaporization and increase condensation heat exchange. In related technologies, some gas water heaters include a main heat exchanger and a condensing heat exchanger that are separately set. When assembling the water heater, the main heat exchanger and the condensing heat exchanger need to be assembled into the shell of the water heater respectively. The assembly structure is complex and the overall space occupied is large. In addition, both the main heat exchanger and the condensing heat exchanger adopt a tube-fin heat exchange structure, which will cause condensed water to easily accumulate in the gap between the fins, resulting in condensed water blockage and affecting the heat exchange efficiency. Utility Model Content

[0003] The main purpose of the utility model is to provide a water heater, which aims to achieve two-stage heat exchange of the water heater, simplify the assembly structure of the water heater, reduce the risk of condensation water blockage, and improve the heat exchange efficiency.

[0004] To achieve the above object, the water heater proposed by the utility model comprises:

[0005] Burner;

[0006] A heat exchanger is located below the burner, the heat exchanger comprises a main heat exchange component and a condensing heat exchange component arranged from top to bottom, the condensing heat exchange component adopts a tubular heat exchange structure;

[0007] a smoke exhaust device, comprising a smoke collecting chamber open toward the heat exchanger, and a smoke exhaust port connected to the smoke collecting chamber, wherein the smoke collecting chamber is used to collect smoke heat-exchanged by the heat exchanger and condensed water generated by the heat exchanger, and the smoke exhaust port is used to exhaust the smoke in the smoke collecting chamber; and

[0008] A fan is used to drive the air flow from the burner to the smoke exhaust device via the heat exchanger.

[0009] In one embodiment, the smoke exhaust device includes a smoke hood and a smoke exhaust pipe connected to the smoke hood, the smoke hood is located on a side of the condensing heat exchange component away from the main heat exchange component, the smoke collecting chamber is formed inside the smoke hood, and a smoke exhaust channel connected to the smoke collecting chamber is formed inside the smoke exhaust pipe, and the smoke exhaust port is provided at one end of the smoke exhaust channel away from the smoke collecting chamber.

[0010] In one embodiment, the smoke collecting hood is made of plastic;

[0011] And / or, the smoke collecting hood and the smoke exhaust pipe are integrally formed.

[0012] In one embodiment, the smoke exhaust device includes an atomization module, and the atomization module is used to atomize the condensed water in the smoke collecting chamber.

[0013] In one embodiment, the water heater also includes a box for accommodating the burner, the heat exchanger is installed at the bottom of the box, the box has a combustion chamber located between the burner and the heat exchanger, the smoke exhaust device is provided with a portion of the smoke collecting chamber connected to the bottom of the heat exchanger, and the fan is installed at the top of the box and connected to the burner.

[0014] In one embodiment, the heat exchanger also includes two end plates arranged relatively spaced apart, the two sides of the main heat exchange component are respectively connected to the two end plates, the two sides of the condensing heat exchange component are respectively connected to the two end plates, the top of each end plate is provided with a first mounting portion connected to the box body, and the bottom of each end plate is provided with a second mounting portion connected to the smoke exhaust device.

[0015] In one embodiment, the main heat exchange component includes a first heat exchange pipeline and a fin group arranged on the periphery of the first heat exchange pipeline, and the condensing heat exchange component includes a second heat exchange pipeline, the water inlet end of the second heat exchange pipeline is connected to the water inlet pipe, the water outlet end of the second heat exchange pipeline is connected to the water inlet end of the first heat exchange pipeline, and the water outlet end of the first heat exchange pipeline is connected to the water outlet pipe.

[0016] In one embodiment, the first heat exchange pipeline is made of copper pipe, and the second heat exchange pipeline is made of stainless steel pipe;

[0017] Alternatively, the first heat exchange pipeline and the second heat exchange pipeline are both made of copper pipes, and the surface of the second heat exchange pipeline is provided with an anti-corrosion layer.

[0018] In one embodiment, the first heat exchange pipeline includes a plurality of first heat exchange tubes extending along a first direction, the plurality of first heat exchange tubes are arranged at intervals along a second direction, the fin assembly is sleeved around the plurality of first heat exchange tubes, and the first direction intersects with the second direction.

[0019] In one embodiment, the second heat exchange pipeline constructs at least one heat exchange layer, and the heat exchange layer includes second heat exchange tubes extending along a first direction. A plurality of second heat exchange tubes of each heat exchange layer are arranged at intervals along a second direction, and the first direction intersects with the second direction.

[0020] In one embodiment, the heat exchange layer has at least two layers arranged at intervals in the up and down direction, the smoke collecting chamber is located below the main heat exchange component, and at least part of the heat exchange layer is located in the smoke collecting chamber.

[0021] In one embodiment, the number of second heat exchange tubes in each heat exchange layer decreases layer by layer from top to bottom, the outermost edge of the lower heat exchange layer in the second direction does not exceed the outermost edge of the upper heat exchange layer in the second direction, and the width of the smoke collecting chamber in the second direction gradually narrows from top to bottom.

[0022] In one embodiment, the second heat exchange pipeline is formed by integrally winding a single pipe;

[0023] Alternatively, the condensing heat exchange component includes two water boxes arranged opposite to each other along the first direction, and both ends of each second heat exchange tube are respectively connected to the two water boxes, so that multiple second heat exchange tubes are interconnected to form the second heat exchange pipeline.

[0024] The technical solution of the utility model is to adopt an integrated heat exchanger for the heat exchanger of the water heater, that is, the main heat exchange component and the condensing heat exchange component are integrated into one heat exchanger, and two-stage heat exchange is realized through the integrated heat exchanger, so that the overall structure of the heat exchanger is simpler and more compact, which is conducive to reducing the volume; when assembling the water heater, it is only necessary to assemble the heat exchanger as a whole into the shell of the water heater at one time. Compared with the traditional water heater, which requires the main heat exchanger and the condensing heat exchanger to be assembled into the shell of the water heater respectively, the use of an integrated heat exchanger can greatly simplify the assembly structure of the water heater and improve the assembly efficiency; and by setting the condensing heat exchange component as a tubular heat exchange structure, the structure is simpler. Since there are no fins on its periphery, the condensed water on the surface of the condensing heat exchange component can quickly drip into the smoke collecting chamber for collection, so as to avoid the accumulation of condensed water in the gap between the fins and the occurrence of condensed water blockage, thereby effectively improving the heat exchange efficiency of the water heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0026] Figure 1 This is a structural schematic diagram of an embodiment of a water heater provided by the utility model (without the cover);

[0027] Figure 2 for Figure 1 A schematic diagram of the structure of the water heater in another state (the cover of the box is omitted);

[0028] Figure 3 for Figure 1 A schematic diagram of the cross-sectional structure of a medium water heater;

[0029] Figure 4 A schematic structural diagram of an embodiment of a heat exchanger provided by the utility model;

[0030] Figure 5 for Figure 4 The main view of the heat exchanger (some fins are omitted);

[0031] Figure 6 for Figure 4 Schematic diagram of the cross-sectional structure of the heat exchanger;

[0032] Figure 7 for Figure 4 A schematic diagram of the structure of the second heat exchange pipeline;

[0033] Figure 8 is a structural schematic diagram of another embodiment of the second heat exchange pipeline;

[0034] Fig. 9 A schematic structural diagram of another embodiment of a heat exchanger provided by the utility model;

[0035] Fig.10 for Fig. 9 Schematic diagram of the cross-sectional structure of the second heat exchange pipeline (arrow indicates the direction of water flow).

[0036] Description of Figure Numbers:

[0037] 100, water heater; 10, burner; 20, heat exchanger; 21, main heat exchange assembly; 211, first heat exchange pipeline; 2111, first heat exchange tube; 212, fin group; 2121, fin; 22, condensing heat exchange assembly; 221, second heat exchange pipeline; 2211, second heat exchange tube; 2212, water box; 22121, water inlet chamber; 22122, water outlet chamber; 22123, reversing water chamber; 22a, first heat exchange layer; 22b, first Second heat exchange layer; 23. End plate; 231. First installation part; 232. Second installation part; 24. Water inlet pipe; 25. Water outlet pipe; 251. Lifting section; 26. Bypass pipe; 30. Smoke exhaust device; 31. Smoke collecting hood; 311. Smoke collecting chamber; 312. Guide surface; 32. Smoke exhaust pipe; 321. Smoke exhaust port; 33. Atomization module; 40. Fan; 50. Box body; 51. Combustion chamber; 60. Gas proportional valve; 70. Bottom shell; 80. Electric control box.

[0038] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0041] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0042] In the context of energy conservation and emission reduction, improving the energy efficiency of gas water heaters has become a trend in the industry. To improve energy efficiency, it is necessary to use the latent heat of flue gas vaporization and increase condensation heat exchange. In related technologies, some gas water heaters include a main heat exchanger and a condensing heat exchanger that are separately set. When assembling the water heater, the main heat exchanger and the condensing heat exchanger need to be assembled into the shell of the water heater respectively. The assembly structure is complex and the overall space occupied is large. In addition, both the main heat exchanger and the condensing heat exchanger adopt a tube-fin heat exchange structure, which will cause condensed water to easily accumulate in the gap between the fins, resulting in condensed water blockage and affecting the heat exchange efficiency.

[0043] Based on this, the utility model proposes a water heater 100, which can realize two-stage heat exchange of the water heater 100, and can simplify the assembly structure of the water heater 100, reduce the risk of condensation water blockage, and improve heat exchange efficiency.

[0044] See also Figures 1 to 4In one embodiment of the utility model, the water heater 100 includes a burner 10, a heat exchanger 20, a smoke exhaust device 30 and a fan 40. The heat exchanger 20 is located below the burner 10, and the heat exchanger 20 includes a main heat exchange component 21 and a condensing heat exchange component 22 arranged from top to bottom, and the condensing heat exchange component 22 adopts a tubular heat exchange structure; the smoke exhaust device 30 has a smoke collecting chamber 311 open to the heat exchanger 20, and a smoke exhaust port 321 connected to the smoke collecting chamber 311, the smoke collecting chamber 311 is used to collect the smoke exchanged by the heat exchanger 20 and the condensed water generated by the heat exchanger 20, and the smoke exhaust port 321 is used to discharge the smoke in the smoke collecting chamber 311; the fan 40 is used to drive the airflow from the burner 10 to the smoke exhaust device 30 via the heat exchanger 20.

[0045] The water heater 100 may be a strong drum type gas water heater 100 with the fan 40 placed above, or a strong extraction type gas water heater 100 with the fan 40 placed below. It is sufficient as long as the airflow can be driven from the burner 10 to the smoke exhaust device 30 from top to bottom under the action of the fan 40. The following mainly takes the strong drum type gas water heater 100 as an example.

[0046] For example, Figures 1 to 3 As shown, the water heater 100 includes a shell, and the shell may include a bottom shell 70 and a cover, and the bottom shell 70 and the cover are enclosed to form a receiving cavity, and the fan 40, the burner 10 and the heat exchanger 20 are installed in the receiving cavity of the shell from top to bottom. The smoke collecting cavity 311 of the smoke exhaust device 30 may be located at the bottom of the heat exchanger 20, and the smoke exhaust port 321 of the smoke exhaust device 30 is located outside the shell. A gas proportional valve 60 connected to the burner 10 is also provided in the shell, and the amount of gas entering the burner 10 is controlled by the gas proportional valve 60. In addition, an electric control box 80 is also provided in the shell, and the electric control box 80 is electrically connected to electrical components such as the burner 10 and the fan 40 to control the working state of the water heater 100. Among them, the heat exchanger 20 is an integrated heat exchanger that integrates the main heat exchange component 21 and the condensing heat exchange component 22 into one, and the water outlet end of the condensing heat exchange component 22 can be connected to the water inlet end of the main heat exchange component 21.

[0047] When the water heater 100 is working, the burner 10 ignites the mixed gas and air to generate high-temperature flue gas. Driven by the fan 40, the high-temperature flue gas can flow from top to bottom and pass through the main heat exchange component 21 and the condensing heat exchange component 22 of the heat exchanger 20 in turn for heat exchange. The flue gas after heat exchange enters the smoke collecting chamber 311 of the smoke exhaust device 30, and finally is discharged from the smoke exhaust port 321 of the smoke exhaust device 30. External cold water can first enter the condensing heat exchange component 22 for preheating, and then be transported to the main heat exchange component 21 for reheating to generate hot water. Among them, the main heat exchange component 21 can be a tube-fin heat exchange structure or a tube heat exchange structure, which is not specifically limited here. The flue gas temperature after heat exchange with the main heat exchange component 21 is generally higher than the flue gas dew point temperature by a certain margin, and condensed water will not be generated on the surface of the main heat exchange component 21. Even if the main heat exchange component 21 adopts a tube-fin heat exchange structure, the problem of condensed water clogging caused by the accumulation of condensed water in the gap between the fins 2121 will not occur. The temperature of the flue gas that exchanges heat with the condensing heat exchange component 22 is relatively low, and the moisture in the flue gas is easily condensed into condensed water on the surface of the condensing heat exchange component 22. By setting the condensing heat exchange component 22 to a tubular heat exchange structure, the structure is simpler, and there are no fins 2121 on its periphery, so that the condensed water on the surface of the condensing heat exchange component 22 can quickly drip into the smoke collecting chamber 311 for collection, so as to avoid the accumulation of condensed water in the gap between the fins 2121 and the occurrence of condensed water blockage.

[0048] The technical solution of the utility model adopts an integrated heat exchanger 20 for the heat exchanger 20 of the water heater 100, that is, the main heat exchange component 21 and the condensing heat exchange component 22 are integrated into one heat exchanger 20, and two-stage heat exchange is realized through the integrated heat exchanger 20, so that the overall structure of the heat exchanger 20 is simpler and more compact, which is conducive to reducing the volume; when assembling the water heater 100, it is only necessary to assemble the heat exchanger 20 as a whole into the shell of the water heater 100 at one time, compared with the traditional water heater 100, which needs to assemble the main heat exchanger 20 and the condensing heat exchanger 22 into a single heat exchanger 20. 0 are respectively assembled into the shell of the water heater 100, the use of an integrated heat exchanger 20 can greatly simplify the assembly structure of the water heater 100 and improve the assembly efficiency; and by setting the condensing heat exchange component 22 as a tubular heat exchange structure, the structure is simpler. Since there are no fins 2121 on its periphery, the condensed water on the surface of the condensing heat exchange component 22 can quickly drip into the smoke collecting chamber 311 for collection, so as to avoid the accumulation of condensed water in the gap between the fins 2121 and the occurrence of condensed water blockage, thereby effectively improving the heat exchange efficiency of the water heater 100.

[0049] like Figure 2 and Figure 3As shown, in one embodiment, the smoke exhaust device 30 includes a smoke collecting hood 31 and a smoke exhaust pipe 32 connected to the smoke collecting hood 31, the smoke collecting hood 31 is located on the side of the condensing heat exchange component 22 away from the main heat exchange component 21, the smoke collecting chamber 311 is formed inside the smoke collecting hood 31, the smoke exhaust pipe 32 has a smoke exhaust channel connected to the smoke collecting chamber 311, and the smoke exhaust port 321 is provided at one end of the smoke exhaust channel away from the smoke collecting chamber 311.

[0050] In this embodiment, the smoke hood 31 is located below the condensing heat exchange assembly 22, and the smoke hood 31 has a smoke collecting chamber 311 with an open top. The smoke exhaust pipe 32 is arranged side by side on one side of the heat exchanger 20 in a horizontal direction and extends vertically upward. The bottom end of the smoke exhaust pipe 32 is connected to the smoke hood 31, and the top of the smoke exhaust pipe 32 is provided with a smoke exhaust port 321. The smoke exhaust pipe 32 has a smoke exhaust channel that connects the smoke exhaust port 321 with the smoke collecting chamber 311. The smoke after heat exchange in the heat exchanger 20 can enter the smoke hood 31 and then be discharged to the outside of the shell of the water heater 100 through the smoke exhaust pipe 32. The condensed water generated on the surface of the heat exchanger 20 can drip into the smoke hood 31 under the action of gravity for collection. In order to facilitate the discharge of condensed water, optionally, the smoke hood 31 has a drain port connected to the smoke collecting chamber 311, and a drain valve is provided at the drain port. When a certain amount of condensed water is collected, the drain port can be opened through the drain valve to discharge the condensed water to the outside of the shell. Alternatively, the smoke collecting hood 31 may be provided with an atomizing module 33, and the condensed water in the smoke collecting chamber 311 may be atomized by the atomizing module 33, and the atomized condensed water may be discharged from the smoke exhaust port 321 to the outside of the housing together with the smoke.

[0051] Since the smoke hood 31 is arranged close to the condensing heat exchange component 22, and the temperature of the smoke after heat exchange in the condensing heat exchange component 22 is further reduced, the high temperature resistance requirement for the smoke hood 31 is relatively low. Optionally, the smoke hood 31 is made of plastic, so that the weight of the water heater 100 can be reduced and the cost can be reduced.

[0052] The smoke hood 31 and the smoke exhaust pipe 32 can be designed separately and then assembled, or they can be integrally formed. Optionally, the smoke hood 31 and the smoke exhaust pipe 32 are integrally formed, so that the manufacturing process of the smoke exhaust device 30 can be simplified. For example, the smoke hood 31 and the smoke exhaust pipe 32 can be integrally stretched and formed by sheet metal parts, or the smoke hood 31 and the smoke exhaust pipe 32 can be integrally injection molded by plastic parts.

[0053] like Figure 2As shown, in one embodiment, the smoke exhaust device 30 includes an atomizing module 33, and the atomizing module 33 is used to atomize the condensed water in the smoke collecting chamber 311. In this way, the condensed water on the surface of the condensing heat exchange component 22 drips into the smoke collecting chamber 311, and the condensed water in the smoke collecting chamber 311 can be atomized by the atomizing module 33, and the atomized condensed water can be discharged through the smoke exhaust port 321. The smoke exhaust device 30 can simultaneously realize the functions of exhausting smoke and discharging condensed water, and there is no need to connect a longer drainage pipe to discharge the condensed water outside the shell, which can further simplify the installation structure of the water heater 100. Among them, the atomizing module 33 has a variety of ways to atomize the condensed water, including but not limited to atomizing the condensed water by ultrasonic atomization, jet atomization, vibrating sieve atomization, etc.

[0054] like Figure 2 As shown, in one embodiment, the water heater 100 also includes a box body 50 for accommodating the burner 10, the heat exchanger 20 is installed at the bottom of the box body 50, the box body 50 has a combustion chamber 51 located between the burner 10 and the heat exchanger 20, the smoke exhaust device 30 is provided with the smoke collecting chamber 311 The part is connected to the bottom of the heat exchanger 20, and the fan 40 is installed on the top of the box body 50 and is connected to the burner 10.

[0055] In this embodiment, the burner 10 is arranged near the top of the box 50, the fire outlet of the burner 10 is downward, the fan 40 is arranged at the top of the box 50, and the air outlet of the fan 40 is connected to the burner 10. The fan 40 can drive the airflow to move from top to bottom on the one hand, and can also supplement the secondary air required for combustion for the burner 10 on the other hand to ensure sufficient combustion. Optionally, a gas proportional valve 60 connected to the burner 10 is also provided on the top of the box 50, and the gas proportional valve 60 and the fan 40 are arranged side by side, so that the top space of the box 50 is fully utilized. The part of the smoke exhaust device 30 where the smoke collecting chamber 311 is provided (such as the smoke collecting hood 31) is connected and fixed to the bottom of the heat exchanger 20, including but not limited to by snap connection, screw connection, hanging and the like. By connecting and fixing the fan 40, the burner 10 and the heat exchanger 20 to the box 50, the installation integration on the box 50 is high, the overall structure is more compact, and it is conducive to the miniaturization of the water heater 100.

[0056] Please combine Figure 2 and Figure 4 In one embodiment, the heat exchanger 20 further includes two end plates 23 arranged relatively spaced apart, the two sides of the main heat exchange component 21 are respectively connected to the two end plates 23, the two sides of the condensing heat exchange component 22 are respectively connected to the two end plates 23, the top of each end plate 23 is provided with a first mounting portion 231 connected to the box body 50, and the bottom of each end plate 23 is provided with a second mounting portion 232 connected to the smoke exhaust device 30.

[0057] In this embodiment, the main heat exchange assembly 21 and the condensing heat exchange assembly 22 are supported and fixed by two end plates 23 at the same time, so that the overall structure of the heat exchanger 20 is simpler and more compact. When assembling the water heater 100, the heat exchanger 20 can be set at the bottom of the box 50, and the tops of the two end plates 23 are respectively connected and fixed to the two side walls of the box 50 through the first mounting parts 231, and the bottoms of the two end plates 23 are respectively connected and fixed to the two side walls of the smoke hood 31 of the smoke exhaust device 30 through the second mounting parts 232. In this way, the two end plates 23 of the heat exchanger 20 can be used as assembly components connected to the box 50 and the smoke exhaust device 30, making the overall assembly structure of the water heater 100 simpler. For example, the main heat exchange assembly 21 includes a first heat exchange pipeline 211, and the first heat exchange pipeline 211 includes a plurality of first heat exchange tubes 2111. The two end plates 23 are respectively provided with first mounting holes for the two ends of each first heat exchange tube 2111 to pass through. The condensing heat exchange assembly 22 includes a second heat exchange pipeline 221, and two end plates 23 are respectively provided with second mounting holes for the two ends of the second heat exchange pipeline 221 to pass through. A first flange is provided at the top of each end plate 23, and a first mounting portion 231 is provided at the first flange. A second flange is provided at the bottom of each end plate 23, and a second mounting portion 232 is provided at the second flange. The first mounting portion 231 and the second mounting portion 232 include but are not limited to mounting structures such as holes and buckles.

[0058] Based on the above embodiments, Figure 4 and Figure 5 As shown, in one embodiment, the main heat exchange component 21 includes a first heat exchange pipeline 211 and a fin group 212 arranged on the periphery of the first heat exchange pipeline 211, and the condensing heat exchange component 22 includes a second heat exchange pipeline 221, the water inlet end of the second heat exchange pipeline 221 is connected to the water inlet pipe 24, the water outlet end of the second heat exchange pipeline 221 is connected to the water inlet end of the first heat exchange pipeline 211, and the water outlet end of the first heat exchange pipeline 211 is connected to the water outlet pipe 25.

[0059] In this embodiment, when the water heater 100 is working, the external cold water is transported from the water inlet pipe 24 to the second heat exchange pipeline 221 for latent heat exchange with the flue gas, and then flows to the first heat exchange pipeline 211 for sensible heat exchange with the flue gas. The heated hot water is output from the water outlet pipe 25 to provide hot water for the user. The main heat exchange component 21 adopts a tube-fin heat exchange structure, and a fin group 212 is provided on the outer periphery of the first heat exchange pipeline 211. The fin group 212 generally includes a plurality of fins 2121 arranged side by side, and there is a small gap between two adjacent fins 2121 for the flue gas to pass through, so that the contact area with the high-temperature flue gas can be increased and the heat exchange efficiency can be improved.

[0060] It is understandable that when the water pressure pumped into the heat exchange tube by the external water source is insufficient, the water in the first heat exchange tube 211 may flow out from the water outlet pipe 25 without filling the entire tube cavity. Since the water in the first heat exchange tube 2111 cannot fill the gap, when the burner 10 heats the first heat exchange tube 211, the water in the tube evaporates and turns into high-temperature steam, which collides with the tube wall and generates vaporization noise.

[0061] In order to reduce the evaporation noise of the water heater 100, as Figure 4 As shown, in one embodiment, the water outlet pipe 25 includes a lifting section 251, and the lowest height of the lifting section 251 in the pipe is not less than the highest height of the first heat exchange pipe 211 in the pipe. In this way, when the heat exchanger 20 flows out through the water outlet pipe 25, it will pass through the lifting section 251. When the water level reaches the lifting section 251, since the lowest point of the lifting section 251 is not less than the highest point of the first heat exchange pipe 211, when the lifting section 251 can be filled with water, the water level in the first heat exchange pipe 211 can reach its highest point. Even when a small amount of water is filled into the heat exchanger 20, the first heat exchange pipe 211 can still be filled with water without leaving any gaps. When the first heat exchange pipe 211 is heated, the high-temperature vaporization of the water inside it can be avoided and the collision with the pipe wall in the gap position to generate vaporization noise, thereby improving the silent effect of the water heater 100 when in use.

[0062] like Figure 4 As shown, in one embodiment, the heat exchanger 20 further includes a bypass pipe 26, and the bypass pipe 26 connects the second heat exchange pipeline 221 with the water outlet pipe 25. In this way, when the water outlet pipe 25 outputs hot water, the water with a relatively low temperature in the second heat exchange pipeline 221 can flow into the water outlet pipe 25 through the bypass pipe 26 for mixing, thereby reducing the water-off temperature rise of the heat exchanger 20.

[0063] In one embodiment, the first heat exchange pipeline 211 is made of copper tubes, and the second heat exchange pipeline 221 is made of stainless steel tubes. In this way, the main heat exchange component 21 is a copper tube fin structure, which can utilize the high thermal conductivity of copper and the enhanced heat exchange energy of the fins 2121 to enhance the heat exchange, thereby making full use of the sensible heat energy of the flue gas. The condensation heat exchange component 22 is a stainless steel tubular heat exchange structure, which can prevent condensation water from clogging, and stainless steel has good corrosion resistance, which can prevent condensation water from corroding the surface of the second heat exchange tube 2211. Optionally, the first heat exchange pipeline 211 and the second heat exchange pipeline 221 can be welded and fixed by copper-steel welding, which can simplify the assembly process of the heat exchanger 20.

[0064] In other embodiments, the first heat exchange pipeline 211 and the second heat exchange pipeline 221 are both made of copper pipes, and the surface of the second heat exchange pipeline 221 is provided with an anti-corrosion layer. In this way, the first heat exchange pipeline 211 and the second heat exchange pipeline 221 can both use the high thermal conductivity of copper for heat exchange, thereby improving the heat exchange efficiency. In addition, the first heat exchange pipeline 211 and the second heat exchange pipeline 221 are made of the same material, which is also more conducive to connection and fixation by welding. By coating the surface of the second heat exchange pipeline 221 with an anti-corrosion layer, it is possible to prevent the condensed water generated on the surface of the second heat exchange pipeline 221 from corroding the surface of the copper pipe.

[0065] Among them, the anti-corrosion layer can be a metal plating layer, for example, the metal plating layer can be formed by nickel plating, chrome plating, zinc plating, etc. on the surface of the second heat exchange pipeline 221. Or the anti-corrosion layer can also be an organic anti-corrosion coating, for example, an organic silicon anti-corrosion coating, a modified synthetic resin anti-corrosion coating, etc. can be coated on the surface of the second heat exchange pipeline 221. The anti-corrosion layer can be set as a single layer or a multi-layer, for example, a metal plating layer can be set on the surface of the second heat exchange pipeline 221 as an anti-corrosion layer, or an organic anti-corrosion coating can be set on the surface of the second heat exchange pipeline 221, or a composite anti-corrosion layer of a metal plating layer and an organic anti-corrosion coating can be set on the surface of the second heat exchange pipeline 221. Optionally, the anti-corrosion layer is a nickel plating layer provided on the surface of the second heat exchange pipeline 221. For example, nickel can be plated on the surface of the copper tube by electroplating. By forming a dense nickel layer on the surface of the copper tube, the corrosion resistance, wear resistance, welding performance, thermal conductivity and other performances of the copper tube can be significantly improved.

[0066] In one embodiment, the second heat exchange pipe 221 is a smooth pipe or a corrugated pipe. For example, the second heat exchange pipe 221 can be a smooth pipe, which has a smoother surface, which is conducive to the rapid dripping of condensed water generated on the surface of the second heat exchange pipe 2211, avoiding condensed water blockage. Alternatively, the second heat exchange pipe 221 is a corrugated pipe with a wrinkled surface, which can increase the heat exchange area and further improve the heat exchange efficiency.

[0067] like Figure 5 and Figure 6 As shown, in one embodiment, the first heat exchange pipeline 211 includes a plurality of first heat exchange tubes 2111 extending along a first direction, the plurality of first heat exchange tubes 2111 are arranged at intervals along a second direction, the fin group 212 is sleeved on the periphery of the plurality of first heat exchange tubes 2111, and the first direction intersects with the second direction.

[0068] In this embodiment, the first heat exchange pipeline 211 includes a plurality of first heat exchange tubes 2111, and the plurality of first heat exchange tubes 2111 can be connected in series or in parallel. For example, the first heat exchange pipeline 211 includes a plurality of first heat exchange tubes 2111 arranged side by side and spaced apart, and the plurality of first heat exchange tubes 2111 are connected in series through connecting elbows. A plurality of fins 2121 are arranged along the extension direction of the first heat exchange tubes 2111 to form a fin group 212, and each fin 2121 is provided with a plurality of perforations, wherein the number of perforations matches the number of the first heat exchange tubes 2111. For example, Figure 6 As shown, the first heat exchange pipeline 211 includes four first heat exchange tubes 2111 arranged in a single row. Correspondingly, each fin 2121 is provided with four perforations arranged in a single row. The first heat exchange tubes 2111 and the perforations on the fins 2121 are interlaced and matched one by one. Of course, the number of first heat exchange tubes 2111 is not limited to four, for example, it can also be three, five or more. A gap for flue gas to pass through is formed between two adjacent fins 2121. The high-temperature flue gas passes through the gap between the fins 2121 along the incoming flow direction, sweeps over the surface of the fins 2121, and realizes the heat transfer from the high-temperature flue gas to the fins 2121, so as to realize the heating of the water in the first heat exchange tube 2111, which can effectively improve the heat exchange efficiency.

[0069] like Figure 5 and Fig. 9 As shown, in some embodiments, the second heat exchange pipeline 221 constructs at least one heat exchange layer, and the heat exchange layer includes a second heat exchange tube 2211 extending along a first direction, and each heat exchange layer has a plurality of second heat exchange tubes 2211 arranged at intervals along a second direction, and the first direction intersects with the second direction.

[0070] In this embodiment, the first direction may be the length direction of the heat exchanger 20, and the second direction may be the width direction of the heat exchanger 20. The second heat exchange pipeline 221 may be constructed to form a single layer, two layers, three layers or more heat exchange layers according to actual needs. After the high-temperature flue gas exchanges heat with the main heat exchange component 21, it flows toward the heat exchange layer of the condensing heat exchange component 22, and exchanges heat with the multiple second heat exchange tubes 2211 in the heat exchange layer layer by layer, which is beneficial to improving the heat exchange efficiency. A gap is formed between two adjacent second heat exchange tubes 2211 in the same heat exchange layer, which is beneficial to the smooth dripping of condensed water on the surface of the second heat exchange tube 2211 from the gap to avoid condensed water blockage.

[0071] Please combine Figure 2 , Figure 3 and Figure 6In one embodiment, the heat exchange layer is arranged in at least two layers in the vertical direction, the smoke collecting chamber 311 is located below the main heat exchange component 21, and at least part of the heat exchange layer is located in the smoke collecting chamber 311. In this way, at least part of the condensation heat exchange component 22 can be accommodated in the smoke collecting chamber 311, so as to make full use of the internal space of the smoke exhaust device 30, so that the arrangement of the various components of the water heater 100 is more compact, which is conducive to the miniaturization of the water heater 100. At the same time, it is also more conducive to the condensed water generated on the surface of the condensation heat exchange component 22 dripping into the smoke collecting chamber 311, avoiding the condensed water splashing around and causing corrosion to other components.

[0072] like Figure 3 and Figure 6 As shown, in one embodiment, the number of the second heat exchange tubes 2211 of each heat exchange layer decreases layer by layer from top to bottom, the outermost edge of the lower heat exchange layer in the second direction does not exceed the outermost edge of the upper heat exchange layer in the second direction, and the width of the smoke collecting chamber 311 in the second direction gradually narrows from top to bottom.

[0073] In this embodiment, the number of the second heat exchange tubes 2211 of each heat exchange layer decreases layer by layer from top to bottom, and the outermost edge of the lower heat exchange layer in the second direction does not exceed the outermost edge of the upper heat exchange layer in the second direction. In this way, the cross-section of the second heat exchange pipeline 221 parallel to the flue gas flow direction is generally an inverted trapezoidal structure that is wide at the top and narrow at the bottom. Correspondingly, the width of the smoke collecting chamber 311 in the second direction gradually narrows from top to bottom, so that the smoke collecting chamber 311 is a funnel-shaped structure adapted to the inverted trapezoidal structure, which is more conducive to guiding the smoke to gradually gather from top to bottom to the middle position, so that the smoke distribution is more uniform. For example, the smoke collecting chamber 311 has two guide surfaces 312 opposite to each other along the second direction, and the two guide surfaces 312 gradually tilt and approach from top to bottom. The guide surfaces 312 can guide the smoke and condensed water, which is conducive to the collection of the smoke and condensed water into the smoke collecting chamber 311.

[0074] For example, Figure 6 As shown, in one embodiment, the heat exchange layer includes a first heat exchange layer 22a and a second heat exchange layer 22b arranged from top to bottom, and the number of second heat exchange tubes 2211 in the first heat exchange layer 22a is greater than the number of second heat exchange tubes 2211 in the second heat exchange layer 22b, so that the width of the first heat exchange layer 22a is greater than the width of the second heat exchange layer 22b. For example, Figure 6As shown, the first heat exchange layer 22a includes 6 second heat exchange tubes 2211 arranged side by side, and the second heat exchange layer 22b includes 5 second heat exchange tubes 2211 arranged side by side. Of course, the number of second heat exchange tubes 2211 of the first heat exchange layer 22a and the second heat exchange layer 22b is not limited thereto, and can be set according to actual needs. In the second direction, the outermost edge of the second heat exchange layer 22b does not exceed the outermost edge of the first heat exchange layer 22a, that is, the projection of the first heat exchange layer 22a toward the second heat exchange layer 22b can completely cover the second heat exchange layer 22b, so that the cross-section of the second heat exchange pipeline 221 parallel to the flue gas flow direction generally presents an inverted trapezoidal structure that is wide at the top and narrow at the bottom, and the two side edges of the inverted trapezoidal structure in the second direction gradually tilt and approach each other from top to bottom, so as to be more conducive to guiding the flue gas from top to bottom toward the middle position of the second heat exchange layer 22b.

[0075] Alternatively, if Figure 6 As shown, the second heat exchange tubes 2211 of two adjacent heat exchange layers are arranged in a staggered manner. For example, the second heat exchange tubes 2211 of the first heat exchange layer 22a can be opposite to the gap between the two adjacent second heat exchange tubes 2211 in the second heat exchange layer 22b, so that the projections of the second heat exchange tubes 2211 of the two adjacent heat exchange layers in the flue gas flow direction can be avoided to completely overlap, so that the flue gas can fully contact the surface of the second heat exchange tubes 2211 of each heat exchange layer during the flow process for heat exchange, so as to improve the heat exchange efficiency; in addition, the condensed water generated on the surface of the second heat exchange tubes 2211 of the upper heat exchange layer can also drip downward from the gap between the two adjacent second heat exchange tubes 2211 of the lower heat exchange layer, ensuring that the condensed water can be discharged smoothly.

[0076] Optionally, the outer diameter of the second heat exchange tube 2211 is larger than the outer diameter of the first heat exchange tube 2111. In this way, the second heat exchange tube 2211 has a larger surface area, thereby increasing the heat exchange area on the side in contact with the flue gas, so that the latent heat of vaporization in the low-temperature flue gas can be fully utilized, improving the condensation heat exchange efficiency, and further improving the overall heat exchange efficiency of the heat exchanger 20.

[0077] There are many ways to form the second heat exchange pipeline 221 of the condensing heat exchange component 22, and several implementation methods are described below with examples.

[0078] like Figure 7 and Figure 8As shown, in some embodiments, the second heat exchange pipeline 221 is formed by winding a single tube as a whole. In this way, the manufacturing process of the second heat exchange pipeline 221 can be simplified and the risk of water leakage can be reduced. For example, the second heat exchange pipeline 221 can be a spiral coil structure or a serpentine tube structure that is formed by winding a single tube as a whole. The second heat exchange pipeline 221 can be a plain tube or a corrugated tube. In this way, the second heat exchange pipeline 221 is arranged in a circuitous manner, which can extend the length of the second heat exchange pipeline 221 as much as possible within a limited space, increase the heat exchange area, and improve the heat exchange efficiency. For example, Figure 7 As shown, when winding the second heat exchange pipeline 221, a longer tube can be used to first extend a certain distance in the first heat exchange layer 22a, then bend to the second heat exchange layer 22b to extend a certain distance, then bend to the first heat exchange layer 22a to extend a certain distance, then bend to the second heat exchange layer 22b to extend a certain distance, and so on, so that the second heat exchange pipeline 221 has a spiral coil structure. For another example, Figure 8 As shown, when winding the second heat exchange pipeline 221, a longer tube can be used to first wind a first serpentine pipeline on the first heat exchange layer 22a, and then bend to the second heat exchange layer 22b to wind a second serpentine pipeline, so that the second heat exchange pipeline 221 has a serpentine tube structure.

[0079] like Fig. 9 and Fig.10 As shown, in another embodiment, the condensing heat exchange component 22 includes two water boxes 2212 arranged opposite to each other along the first direction, and both ends of each second heat exchange tube 2211 are respectively connected to the two water boxes 2212, so that multiple second heat exchange tubes 2211 are interconnected to form the second heat exchange pipeline 221.

[0080] In this embodiment, the second heat exchange pipeline 221 is formed by multiple independent second heat exchange tubes 2211 connected to water boxes 2212 at both ends thereof. The multiple second heat exchange tubes 2211 located between the two water boxes 2212 can be connected in series or in parallel. The tube diameter size and arrangement density of the multiple second heat exchange tubes 2211 are not restricted. Therefore, second heat exchange tubes 2211 with a thinner tube diameter can be used, and the arrangement spacing of adjacent second heat exchange tubes 2211 can be made smaller, so that the second heat exchange pipeline 221 can achieve a large water volume while helping to reduce the overall height and arrangement volume of the heat exchanger 20.

[0081] like Fig.10As shown, in one embodiment, both ends of the second heat exchange pipeline 221 are respectively provided with a water inlet cavity 22121 for connecting to the water inlet pipe 24, and a water outlet cavity 22122 connected to the water inlet end of the first heat exchange pipeline 211; the water inlet cavity 22121 is arranged in one of the water boxes 2212, and the water outlet cavity 22122 is arranged in the other water box 2212; or, the water inlet cavity 22121 and the water outlet cavity 22122 are both arranged in the same water box 2212.

[0082] For example, when the water inlet cavity 22121 is provided in one of the water boxes 2212, and the water outlet cavity 22122 is provided in the other water box 2212, the water inlet end and the water outlet end of the second heat exchange pipe 221 are respectively provided on both sides of the condensing heat exchange component 22, and the second heat exchange pipe 221 can be used to flow directly from one water box 2212 to the other water box 2212. In other words, one water box 2212 is only provided with the water inlet cavity 22121, and the other water box 2212 is only provided with the water outlet cavity 22122, and the flow directions of all the second heat exchange pipes 2211 are the same.

[0083] Or in other embodiments, the second heat exchange pipeline 221 takes in water from the water inlet chamber 22121 of one water box 2212, then flows to the other water box 2212, then flows to the first water box 2212 after changing direction from the other water box 2212, then flows to the water outlet chamber 22122 of the other water box 2212 after changing direction from the first water box 2212, and then flows from the water outlet chamber 22122 to the first heat exchange pipeline 211. The water flow direction in the second heat exchange pipeline 221 adopts an odd-numbered winding manner, which is not limited here.

[0084] like Fig.10 As shown, in one embodiment, the second heat exchange pipeline 221 includes a plurality of heat exchange pipe sections connected in series, each of the heat exchange pipe sections includes at least one second heat exchange tube 2211, wherein at least one of the water boxes 2212 is provided with a reversing water cavity 22123, and the same end of the second heat exchange tubes 2211 in two adjacent heat exchange pipe sections is connected to the same reversing water cavity 22123.

[0085] In this embodiment, when the second heat exchange pipeline 221 includes a plurality of heat exchange pipe sections connected in series, the water in the entire second heat exchange pipeline 221 flows in a circuitous manner. To this end, a reversing water chamber 22123 can be provided at the intersection of the two heat exchange pipe sections, and the reversing water chamber 22123 is provided in the water box 2212.

[0086] For example, when the second heat exchange pipeline 221 adopts only one section of circuitous arrangement, that is, the second heat exchange pipeline 221 only includes two heat exchange pipe sections, the water inlet chamber 22121 and the water outlet chamber 22122 of the second heat exchange pipeline 221 are both provided with the same water box 2212, and the connection of the two heat exchange pipe sections is provided in another water box 2212. For this purpose, a reversing water chamber 22123 can be provided in the above-mentioned other water box 2212 to connect the two heat exchange pipe sections. When the second heat exchange pipeline 221 adopts a circuitous arrangement of not less than three odd-numbered heat exchange pipe sections, or when the second heat exchange pipeline 221 adopts a circuitous arrangement of not less than four even-numbered heat exchange pipe sections, each water box 2212 is provided with a reversing water chamber 22123.

[0087] like Fig.10 As shown, in one embodiment, at least one of the heat exchange pipe sections includes a plurality of the second heat exchange pipes 2211 arranged in parallel. In this way, when at least one of the heat exchange pipe sections includes a plurality of the second heat exchange pipes 2211 arranged in parallel, the heat exchange pipe section can ensure a large water flow while reducing the overall thickness of the heat exchange pipe section, and when the arrangement spacing between two adjacent second heat exchange pipes 2211 of the heat exchange pipe section is small enough, the overall width of the heat exchange pipe section can also be reduced, so that the heat exchange pipe section can maintain a small volume while achieving a large flow.

[0088] Optionally, each of the heat exchange pipe sections includes a plurality of the second heat exchange pipes 2211 arranged in parallel, and the number of the second heat exchange pipes 2211 in each of the heat exchange pipe sections is the same. With such an arrangement, each heat exchange pipe section can achieve a large flow rate, so that the entire second heat exchange pipeline 221 can achieve a large flow rate. And because each second heat exchange pipe 2211 section is provided with a plurality of second heat exchange pipes 2211 of the same number, when the inner diameter of each second heat exchange pipe 2211 is the same, the flow rate of each heat exchange pipe section is the same, and the flow rate is also the same, so that the water pressure on each second heat exchange pipe 2211 can be the same, and the arrangement of the second heat exchange pipes 2211 in the condensing heat exchange assembly 22 can be more regular.

[0089] Optionally, each of the end plates 23 includes an outer plate body and an inner plate body, and the outer plate body and the inner plate body of each of the end plates 23 are combined to form a water box 2212 .

[0090] In this embodiment, the end plate 23 is composed of an outer plate body and an inner plate body, and one or more protrusions can be provided on the outer plate body, and one or more recesses can be provided on the side of the protrusion facing the inner plate body. When the outer plate body and the inner plate body are spliced, the above-mentioned recesses can be closed with the inner plate body to form a water inlet chamber 22121, a water outlet chamber 22122 and a reversing water chamber 22123. Such a configuration can make the configuration of the water box 2212 simpler, and it can be formed by only splicing the outer plate body and the inner plate body, which can reduce the assembly cost of the condensing heat exchange component 22.

[0091] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A water heater, characterized in that: include: Burner; A heat exchanger is located below the burner, the heat exchanger comprises a main heat exchange component and a condensing heat exchange component arranged from top to bottom, the condensing heat exchange component adopts a tubular heat exchange structure; a smoke exhaust device, comprising a smoke collecting chamber open toward the heat exchanger, and a smoke exhaust port connected to the smoke collecting chamber, wherein the smoke collecting chamber is used to collect smoke heat-exchanged by the heat exchanger and condensed water generated by the heat exchanger, and the smoke exhaust port is used to exhaust smoke in the smoke collecting chamber; as well as A fan is used to drive the air flow from the burner to the smoke exhaust device via the heat exchanger.

2. The water heater according to claim 1, characterized in that: The smoke exhaust device includes a smoke collecting hood and a smoke exhaust pipe connected to the smoke collecting hood. The smoke collecting hood is located on a side of the condensing heat exchange component away from the main heat exchange component. The smoke collecting chamber is formed inside the smoke collecting hood. A smoke exhaust channel connected to the smoke collecting chamber is formed inside the smoke exhaust pipe. The smoke exhaust port is provided at one end of the smoke exhaust channel away from the smoke collecting chamber.

3. The water heater according to claim 2, characterized in that: The smoke collecting hood is made of plastic; And / or, the smoke collecting hood and the smoke exhaust pipe are integrally formed.

4. The water heater according to claim 1, characterized in that: The smoke exhaust device comprises an atomization module, and the atomization module is used to atomize the condensed water in the smoke collecting chamber.

5. The water heater according to claim 1, characterized in that: The water heater also includes a box for accommodating the burner, the heat exchanger is installed at the bottom of the box, the box has a combustion chamber located between the burner and the heat exchanger, the smoke exhaust device is provided with a portion of the smoke collecting chamber connected to the bottom of the heat exchanger, and the fan is installed at the top of the box and connected to the burner.

6. The water heater according to claim 5, characterized in that The heat exchanger also includes two end plates arranged relatively at intervals, the two sides of the main heat exchange component are respectively connected to the two end plates, the two sides of the condensing heat exchange component are respectively connected to the two end plates, the top of each end plate is provided with a first mounting portion connected to the box body, and the bottom of each end plate is provided with a second mounting portion connected to the smoke exhaust device.

7. The water heater according to any one of claims 1 to 6, characterized in that: The main heat exchange component includes a first heat exchange pipeline and a fin group sleeved on the periphery of the first heat exchange pipeline, and the condensing heat exchange component includes a second heat exchange pipeline, the water inlet end of the second heat exchange pipeline is connected to the water inlet pipe, the water outlet end of the second heat exchange pipeline is connected to the water inlet end of the first heat exchange pipeline, and the water outlet end of the first heat exchange pipeline is connected to the water outlet pipe.

8. The water heater according to claim 7, characterized in that The first heat exchange pipeline is made of copper pipe, and the second heat exchange pipeline is made of stainless steel pipe; Alternatively, the first heat exchange pipeline and the second heat exchange pipeline are both made of copper pipes, and the surface of the second heat exchange pipeline is provided with an anti-corrosion layer.

9. The water heater according to claim 7, characterized in that: The first heat exchange pipeline includes a plurality of first heat exchange tubes extending along a first direction, the plurality of first heat exchange tubes are arranged at intervals along a second direction, the fin assembly is sleeved around the plurality of first heat exchange tubes, and the first direction intersects with the second direction.

10. The water heater according to claim 7, characterized in that The second heat exchange pipeline constructs at least one heat exchange layer, and the heat exchange layer includes second heat exchange tubes extending along a first direction. A plurality of second heat exchange tubes of each heat exchange layer are arranged at intervals along a second direction, and the first direction intersects with the second direction.

11. The water heater according to claim 10, characterized in that The heat exchange layer has at least two layers arranged at intervals in the up-down direction, the smoke collecting chamber is located below the main heat exchange component, and at least part of the heat exchange layer is located in the smoke collecting chamber.

12. The water heater according to claim 11, characterized in that The number of second heat exchange tubes in each heat exchange layer decreases layer by layer from top to bottom, the outermost edge of the lower heat exchange layer in the second direction does not exceed the outermost edge of the upper heat exchange layer in the second direction, and the width of the smoke collecting chamber in the second direction gradually narrows from top to bottom.

13. The water heater according to claim 10, characterized in that The second heat exchange pipeline is formed by winding a single pipe in one piece; Alternatively, the condensing heat exchange component includes two water boxes arranged opposite to each other along the first direction, and both ends of each second heat exchange tube are respectively connected to the two water boxes, so that multiple second heat exchange tubes are interconnected to form the second heat exchange pipeline.

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