Heat exchanger and water heater

Abstract

The utility model discloses a heat exchanger and a water heater, and relates to the technical field of heat exchange, the heat exchanger comprises: a main heat exchange assembly comprising a first heat exchange pipeline; the condensation heat exchange assembly is located on one side of the main heat exchange assembly and comprises a second heat exchange pipeline, the water outlet end of the second heat exchange pipeline communicates with the water inlet end of the first heat exchange pipeline, and the second heat exchange pipeline comprises a pipeline body and an anti-corrosion layer arranged on the surface of the pipeline body. The pipeline body is made of a copper pipe. According to the technical scheme, two-stage heat exchange is achieved through a simpler heat exchanger structure, the condensation heat exchange pipeline can be prevented from being corroded, and the heat exchange efficiency and the service life are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange, in particular to a heat exchanger and 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, which can achieve two-stage heat exchange, main heat exchange and condensation heat exchange. However, the main heat exchanger and the condensing heat exchanger generally adopt a split design, with a complex structure and a large overall space occupation; and condensation water will be generated on the surface of the condensing heat exchanger, which is easy to cause corrosion of the condensing heat exchange pipeline, affecting the heat exchange efficiency and service life. Utility Model Content

[0003] The main purpose of the utility model is to provide a heat exchanger and a water heater, aiming to achieve two-stage heat exchange through a simpler heat exchanger structure, and to avoid corrosion of the condensation heat exchange pipeline, thereby ensuring heat exchange efficiency and service life.

[0004] To achieve the above purpose, the heat exchanger proposed by the utility model includes:

[0005] A main heat exchange assembly includes a first heat exchange pipeline; and

[0006] The condensing heat exchange component is located on one side of the main heat exchange component. The condensing heat exchange component includes a second heat exchange pipeline. The water outlet end of the second heat exchange pipeline is connected to the water inlet end of the first heat exchange pipeline. The second heat exchange pipeline includes a pipeline body and an anti-corrosion layer arranged on the surface of the pipeline body. The pipeline body adopts a copper tube.

[0007] In one embodiment, the anti-corrosion layer includes a metal plating layer and / or an organic anti-corrosion coating.

[0008] In one embodiment, the anti-corrosion layer is a nickel-plated layer provided on the surface of the pipeline body.

[0009] In one embodiment, the second heat exchange pipeline is a plain tube or a corrugated tube;

[0010] And / or, the first heat exchange pipeline adopts a copper tube.

[0011] In one embodiment, the second heat exchange pipeline is constructed with at least two heat exchange layers opposite to the main heat exchange assembly along the first direction, each of the heat exchange layers includes a plurality of second heat exchange tubes arranged side by side and spaced apart along the second direction, the second heat exchange tubes of two adjacent heat exchange layers are staggered, and the first direction intersects with the second direction.

[0012] In one embodiment, the second heat exchange pipeline is a spiral coil structure or a serpentine tube structure formed by integrally winding a single tube.

[0013] In one embodiment, the first heat exchange pipeline includes a plurality of first heat exchange tubes arranged side by side and spaced apart from each other, and the main heat exchange assembly further includes a fin group sleeved on the outer periphery of the plurality of first heat exchange tubes.

[0014] In one embodiment, the condensing heat exchange component is located below the main heat exchange component and downstream of the main heat exchange component in the flue gas flow direction.

[0015] In one embodiment, the heat exchanger also includes a water inlet pipe and a water outlet pipe, the water inlet end of the second heat exchange pipeline is connected to the water inlet pipe, the water outlet end of the first heat exchange pipeline is connected to the water outlet pipe, the water outlet pipe includes a lifting section, and the lowest height inside the lifting section is not less than the highest height inside the first heat exchange pipeline.

[0016] The utility model also provides a water heater, comprising:

[0017] A heat exchanger as described above; and

[0018] A burner is located on a side of the main heat exchange component away from the condensing heat exchange component.

[0019] The technical solution of the utility model integrates the main heat exchange component and the condensing heat exchange component into one heat exchanger, and realizes two-stage heat exchange 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; and the second heat exchange pipeline of the condensing heat exchange component (that is, the condensing heat exchange pipeline) includes a pipeline body and an anti-corrosion layer arranged on the surface of the pipeline body. The pipeline body adopts a copper tube, and the high thermal conductivity of copper can be used to improve the condensation heat exchange efficiency. By coating the surface of the pipeline body with an anti-corrosion layer, the condensed water generated on the surface of the second heat exchange pipeline can be prevented from corroding the surface of the copper tube, so as to ensure the heat exchange efficiency and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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.

[0021] Figure 1 A schematic structural diagram of an embodiment of a heat exchanger provided by the utility model;

[0022] Figure 2 for Figure 1 The main view of the heat exchanger (some fins are omitted);

[0023] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure of the heat exchanger;

[0024] Figure 4 for Figure 1 A schematic diagram of the structure of the second heat exchange pipeline of the middle heat exchanger;

[0025] Figure 5 It is a structural schematic diagram of another embodiment of the second heat exchange pipeline.

[0026] Description of Figure Numbers:

[0027] 100, heat exchanger; 10, main heat exchange component; 11, first heat exchange pipeline; 111, first heat exchange tube; 12, fin group; 121, fin; 20, condensing heat exchange component; 21, second heat exchange pipeline; 211, second heat exchange tube; 20a, first heat exchange layer; 20b, second heat exchange layer; 30, water inlet pipe; 40, water outlet pipe; 41, lifting section; 50, bypass pipe; 60, end plate.

[0028] 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

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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, which can achieve two-stage heat exchange, main heat exchange and condensation heat exchange. However, the main heat exchanger and the condensing heat exchanger generally adopt a split design, which has a complex structure and occupies a large space overall. In addition, since condensation water will be generated on the surface of the condensing heat exchanger, it is easy to cause the condensation heat exchange pipeline to be corroded, affecting the heat exchange efficiency and service life.

[0033] Based on this, the utility model proposes a heat exchanger 100, which realizes two-stage heat exchange through a simpler heat exchanger structure, and can avoid corrosion of the condensation heat exchange pipeline, thereby ensuring heat exchange efficiency and service life.

[0034] See also Figures 1 to 3 In one embodiment of the utility model, the heat exchanger 100 includes a main heat exchange component 10 and a condensing heat exchange component 20. The main heat exchange component 10 includes a first heat exchange pipeline 11; the condensing heat exchange component 20 is located on one side of the main heat exchange component 10, and the condensing heat exchange component 20 includes a second heat exchange pipeline 21, the water outlet of the second heat exchange pipeline 21 is connected to the water inlet of the first heat exchange pipeline 11, and the second heat exchange pipeline 21 includes a pipeline body and an anti-corrosion layer provided on the surface of the pipeline body, and the pipeline body adopts a copper tube.

[0035] The heat exchanger 100 includes a main heat exchange component 10 and a condensation heat exchange component 20. The condensation heat exchange component 20 and the main heat exchange component 10 can be arranged side by side vertically or horizontally, as long as both are located on the flue gas flow path and the condensation heat exchange component 20 is located downstream of the main heat exchange component 10 in the flue gas flow direction. For example, when the flue gas flows from top to bottom, the condensation heat exchange component 20 is located below the main heat exchange component 10; when the flue gas flows from bottom to top, the condensation heat exchange component 20 is located above the main heat exchange component 10. When the flue gas flows from left to right, the condensation heat exchange component 20 is located on the right side of the main heat exchange component 10; when the flue gas flows from right to left, the condensation heat exchange component 20 is located on the left side of the main heat exchange component 10. For example, when the heat exchanger 100 is applied to a water heater, the burner of the water heater can be arranged on the side of the main heat exchange component 10 away from the condensing heat exchange component 20. In this way, the high-temperature flue gas first passes through the surface of the main heat exchange component 10 for heat exchange, and then passes through the surface of the condensing heat exchange component 20 for condensation heat exchange; the external cold water can be first transported to the second heat exchange pipeline 21 for preheating, and then transported to the first heat exchange pipeline 11 for reheating and then output hot water.

[0036] Among them, the second heat exchange pipeline 21 (that is, the condensation heat exchange pipeline) of the condensation heat exchange component 20 includes a pipeline body and an anti-corrosion layer provided on the surface of the pipeline body. The pipeline body adopts a copper tube, and the thermal conductivity of copper is about 385W / (m·K) (at 20°C), so that copper can effectively transfer heat from one area to another area, so that the high thermal conductivity of copper can be used to improve the condensation heat exchange efficiency of the condensation heat exchange component 20. And by coating the surface of the pipeline body with an anti-corrosion layer, it is possible to avoid the condensed water generated on the surface of the second heat exchange pipeline 21 from corroding the surface of the copper tube to ensure the heat exchange efficiency and service life. Among them, the anti-corrosion layer can be a metal plating layer, for example, a metal plating layer can be formed by nickel plating, chromium plating, zinc plating, etc. on the surface of the pipeline body. 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 pipeline body. The anti-corrosion layer can be set as a single layer or multiple layers. For example, a metal plating layer can be set on the surface of the pipeline body as the anti-corrosion layer, or an organic anti-corrosion coating can be set on the surface of the pipeline body, 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 pipeline body. Optionally, the anti-corrosion layer is a nickel plating layer provided on the surface of the pipeline body. For example, the second heat exchange pipeline 21 can be formed by nickel plating on the surface of the copper tube by an electroplating process. 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.

[0037] The technical solution of the utility model integrates the main heat exchange component 10 and the condensing heat exchange component 20 into a heat exchanger 100, and realizes two-stage heat exchange through the integrated heat exchanger 100, so that the overall structure of the heat exchanger 100 is simpler and more compact, which is conducive to reducing the volume; and the second heat exchange pipeline 21 (that is, the condensing heat exchange pipeline) of the condensing heat exchange component 20 includes a pipeline body and an anti-corrosion layer arranged on the surface of the pipeline body. The pipeline body adopts a copper tube, and the high thermal conductivity of copper can be used to improve the condensation heat exchange efficiency. By coating the surface of the pipeline body with an anti-corrosion layer, the condensed water generated on the surface of the second heat exchange pipeline 21 can be prevented from corroding the surface of the copper tube, so as to ensure the heat exchange efficiency and service life.

[0038] In one embodiment, the second heat exchange pipe 21 is a smooth pipe or a corrugated pipe. For example, the second heat exchange pipe 21 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 211, avoiding condensed water blockage. Alternatively, the second heat exchange pipe 21 is a corrugated pipe with a wrinkled surface, which can increase the heat exchange area and further improve the heat exchange efficiency.

[0039] In one embodiment, the first heat exchange pipeline 11 is made of copper pipe. In this way, the first heat exchange pipeline 11 can also use the high thermal conductivity of copper to improve the heat exchange efficiency. In addition, the pipeline bodies of the first heat exchange pipeline 11 and the second heat exchange pipeline 21 are both made of copper pipes, which are made of the same material, making it easier to weld the first heat exchange pipeline 11 and the second heat exchange pipeline 21 to simplify the assembly structure.

[0040] In order to further improve the heat exchange efficiency of the condensing heat exchange component 20, as Figure 2 and Figure 3 As shown, in one embodiment, the second heat exchange pipeline 21 constructs at least two heat exchange layers opposite to the main heat exchange component 10 along the first direction, each of the heat exchange layers includes a plurality of second heat exchange tubes 211 arranged side by side and spaced apart along the second direction, the second heat exchange tubes 211 of two adjacent heat exchange layers are staggered, and the first direction intersects with the second direction.

[0041] In this embodiment, the second heat exchange pipeline 21 is constructed with multiple heat exchange layers arranged at intervals along the first direction, which can increase the heat exchange area and improve the heat exchange efficiency. Among them, the number of heat exchange layers can be two layers, three layers or more. Each heat exchange layer includes a plurality of second heat exchange tubes 211 arranged at intervals along the second direction, and each second heat exchange tube 211 is extended along the third direction. Multiple second heat exchange tubes 211 in the same heat exchange layer can be connected in series or in parallel. Among them, the first direction can be the height direction of the heat exchanger 100, the second direction can be the width direction of the heat exchanger 100, and the third direction can be the length direction of the heat exchanger 100. After the high-temperature flue gas exchanges heat with the main heat exchange component 10, it flows toward the heat exchange layer of the condensing heat exchange component 20, and exchanges heat with the plurality of second heat exchange tubes 211 in the heat exchange layer layer by layer, which is conducive to improving the heat exchange efficiency. A gap is formed between two adjacent second heat exchange tubes 211 in the same heat exchange layer, and the second heat exchange tubes 211 of two adjacent heat exchange layers are staggered, which can ensure that the condensed water generated on the surface of the second heat exchange tube 211 can be smoothly discharged from the gap to avoid condensed water blockage.

[0042] For example, the heat exchange layer may include a first heat exchange layer 20a and a second heat exchange layer 20b arranged at intervals, and the second heat exchange tube 211 of the first heat exchange layer 20a and the second heat exchange tube 211 of the second heat exchange layer 20b are arranged in a staggered manner. That is, the second heat exchange tube 211 of the first heat exchange layer 20a may be opposite to the gap between two adjacent second heat exchange tubes 211 in the second heat exchange layer 20b, so that the projections of the two adjacent heat exchange layers in the flue gas flow direction can be prevented from completely overlapping, so that the flue gas can fully contact the surface of the second heat exchange tube 211 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 tube 211 of the upper heat exchange layer can also drip downward from the gap between the two adjacent second heat exchange tubes 211 of the lower heat exchange layer, so as to ensure that the condensed water can be discharged smoothly.

[0043] like Figure 4 and Figure 5 As shown, in some embodiments, the second heat exchange pipeline 21 is a spiral coil structure or a serpentine structure formed by winding a single tube. In this way, the second heat exchange pipeline 21 is arranged in a circuitous manner, which can extend the length of the second heat exchange pipeline 21 as much as possible within a limited space, increase the heat exchange area, and improve the heat exchange efficiency. In addition, the second heat exchange pipeline 21 is formed by winding a single tube, which can also simplify the manufacturing process of the second heat exchange pipeline 21. For example, Figure 4As shown, when winding the second heat exchange pipeline 21, a longer pipe can be used to first extend a certain distance in the first heat exchange layer 20a, then bend to the second heat exchange layer 20b to extend a certain distance, then bend to the first heat exchange layer 20a to extend a certain distance, then bend to the second heat exchange layer 20b to extend a certain distance, and so on, so that the second heat exchange pipeline 21 has a spiral coil structure. For another example, Figure 5 As shown, when winding the second heat exchange pipeline 21, a longer tube can be used to firstly wind a first serpentine pipeline on the first heat exchange layer 20a, and then bend to the second heat exchange layer 20b to wind a second serpentine pipeline, so that the second heat exchange pipeline 21 has a serpentine tube structure.

[0044] In order to further improve the heat transfer efficiency, Figure 2 and Figure 3 As shown, in one embodiment, the first heat exchange pipeline 11 includes a plurality of first heat exchange tubes 111 arranged side by side and spaced apart, and the main heat exchange component 10 also includes a fin group 12 sleeved on the periphery of the plurality of first heat exchange tubes 111 .

[0045] In this embodiment, the main heat exchange component 10 adopts a tube-fin heat exchange structure, and a plurality of first heat exchange tubes 111 can be connected in series or in parallel to form a first heat exchange pipeline 11. The plurality of first heat exchange tubes 111 can be arranged in one layer, two layers or more in the first direction. Optionally, the plurality of first heat exchange tubes 111 are arranged at intervals to form a single-layer structure, and the plurality of first heat exchange tubes 111 can be connected in series through connecting bends to form a first heat exchange pipeline 11 that is arranged in a circuitous manner. A plurality of fins 121 are arranged along the first direction to form a fin group 12, and each fin 121 is provided with a plurality of perforations, wherein the number of perforations is adapted to the number of the first heat exchange tubes 111. For example, as Figure 3 As shown, the first heat exchange pipeline 11 includes four first heat exchange tubes 111 arranged in a single row. Correspondingly, each fin 121 is provided with four perforations arranged in a single row. The first heat exchange tubes 111 are interlaced and matched with the perforations on the fins 121 in a one-to-one correspondence. Of course, the number of first heat exchange tubes 111 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 121. The high-temperature flue gas passes through the gap between the fins 121 along the incoming flow direction, sweeps across the surface of the fins 121, and realizes the heat transfer from the high-temperature flue gas to the fins 121, so as to realize the heating of the water in the first heat exchange tube 111, which can effectively improve the heat exchange efficiency.

[0046] Based on the above embodiments, Figure 2 As shown, in one embodiment, the condensing heat exchange component 20 is located below the main heat exchange component 10 and downstream of the main heat exchange component 10 in the flue gas flow direction.

[0047] In this embodiment, the condensing heat exchange component 20 is located below the main heat exchange component 10. When applied to a water heater, the burner of the water heater can be arranged above the main heat exchange component 10, so that the condensing heat exchange component 20 is located downstream of the main heat exchange component 10 in the flue gas flow direction. In this way, the high-temperature flue gas generated by the combustion of the burner flows from top to bottom, first passes through the main heat exchange component 10 for main heat exchange, and then passes through the condensing heat exchange component 20 for condensation heat exchange. The flue gas temperature after heat exchange with the main heat exchange component 10 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 10. Therefore, even if the main heat exchange component 10 adopts a tube-fin heat exchange structure, there will be no problem of condensed water accumulating in the gap between the fins 121 and causing condensed water blockage. The condensing heat exchange component 20 adopts a tubular heat exchange structure, and there are no fins 121 on the periphery of the second heat exchange pipeline 21, so that the condensed water generated on the surface of the second heat exchange pipeline 21 can drip quickly to avoid the accumulation of condensed water in the gaps between the fins 121 and the occurrence of condensed water blockage. The condensing heat exchange component 20 is located below the main heat exchange component 10. The condensed water generated on the surface of the condensing heat exchange component 20 can drip downward under the action of gravity, but will not drip onto the surface of the main heat exchange component 10 and affect the main heat exchange efficiency.

[0048] It is understandable that when the water pressure pumped into the heat exchange tube by the external water source is insufficient and the first heat exchange tube 11 is located at a relatively high position, the water in the first heat exchange tube 11 may flow out from the water outlet pipe 40 without filling the entire tube cavity. Since the water in the first heat exchange tube 11 cannot fill the gap, when the burner heats the first heat exchange tube 11, the water in the tube evaporates and turns into high-temperature steam, which collides with the tube wall and generates vaporization noise.

[0049] like Figure 1 As shown, in one embodiment, the heat exchanger 100 also includes a water inlet pipe 30 and a water outlet pipe 40, the water inlet end of the second heat exchange pipeline 21 is connected to the water inlet pipe 30, the water outlet end of the first heat exchange pipeline 11 is connected to the water outlet pipe 40, and the water outlet pipe 40 includes a lifting section 41, and the lowest height of the lifting section 41 in the pipe is not less than the highest height of the first heat exchange pipeline 11 in the pipe.

[0050] In this embodiment, when the heat exchanger 100 is working, external cold water can be transported to the second heat exchange pipeline 21 through the water inlet pipe 30 for preheating, and then transported to the first heat exchange pipeline 11 for further heating, and the heated hot water is output from the water outlet pipe 40. When the heat exchanger 100 flows out through the water outlet pipe 40, it will pass through the lifting section 41. When the water level reaches the lifting section 41, since the lowest point of the lifting section 41 is not less than the highest point of the first heat exchange pipeline 11, when the lifting section 41 can be filled with water, the water level in the first heat exchange pipeline 11 can reach its highest point. Even when a small amount of water is inlet into the heat exchanger 100, the first heat exchange pipeline 11 can still be filled with water without leaving any gaps. When the first heat exchange pipeline 11 is heated, the high-temperature vaporization of the internal water can be avoided and the collision with the pipe wall in the gap position to generate vaporization noise, thereby improving the quiet effect of the heat exchanger 100 when in use.

[0051] like Figure 1 As shown, in one embodiment, the heat exchanger 100 further includes a bypass pipe 50, and the bypass pipe 50 connects the second heat exchange pipeline 21 with the water outlet pipe 40. In this way, when the water outlet pipe 40 outputs hot water, the water with a relatively low temperature in the second heat exchange pipeline 21 can flow into the water outlet pipe 40 through the bypass pipe 50 for mixing, thereby reducing the water-off temperature rise of the heat exchanger 100. Optionally, the second heat exchange pipeline 21 is connected to the first heat exchange pipeline 11 through a connecting pipe, one end of the bypass pipe 50 is connected to the connecting pipe, and the other end is connected to the water outlet pipe 40, so that part of the water flow output by the second heat exchange pipeline 21 flows to the first heat exchange pipeline 11, and the other part flows to the water outlet pipe 40 through the bypass pipe 50.

[0052] In order to facilitate the installation of the main heat exchange component 10 and the condensing heat exchange component 20, as shown in FIG. Figure 2 As shown, in one embodiment, the heat exchanger 100 further includes two end plates 60 arranged relatively spaced apart, and the first heat exchange pipeline 11 and the second heat exchange pipeline 21 are both supported by the two end plates 60. In this way, the first heat exchange pipeline 11 and the second heat exchange pipeline 21 share two end plates 60 for installation and fixation, which is beneficial to simplifying the structure of the heat exchanger 100, saving materials, reducing costs, and reducing the volume of the heat exchanger 100.

[0053] The utility model also provides a water heater, which includes a heat exchanger 100 and a burner, wherein the burner is located on the side of the main heat exchange component 10 away from the condensing heat exchange component 20. The specific structure of the heat exchanger 100 refers to the above embodiment, and since the water heater adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0054] In this embodiment, the burner can be located below the heat exchanger 100, and the condensing heat exchange component 20 of the heat exchanger 100 is located above the main heat exchange component 10, and the flue gas generated by the burner combustion flows from bottom to top, and passes through the main heat exchange component 10 and the condensing heat exchange component 20 in sequence for heat exchange. Alternatively, the burner can be located above the heat exchanger 100, and the main heat exchange component 10 of the heat exchanger 100 is located above the condensing heat exchange component 20, and the flue gas generated by the burner combustion flows from top to bottom, and passes through the main heat exchange component 10 and the condensing heat exchange component 20 in sequence for heat exchange.

[0055] 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 heat exchanger, characterized in that: include: A main heat exchange assembly, comprising a first heat exchange pipeline; as well as The condensing heat exchange component is located on one side of the main heat exchange component. The condensing heat exchange component includes a second heat exchange pipeline. The water outlet end of the second heat exchange pipeline is connected to the water inlet end of the first heat exchange pipeline. The second heat exchange pipeline includes a pipeline body and an anti-corrosion layer arranged on the surface of the pipeline body. The pipeline body adopts a copper tube.

2. The heat exchanger according to claim 1, characterized in that The anti-corrosion layer includes a metal plating layer and / or an organic anti-corrosion coating.

3. The heat exchanger according to claim 1, characterized in that The anti-corrosion layer is a nickel-plated layer arranged on the surface of the pipeline body.

4. The heat exchanger according to claim 1, characterized in that The second heat exchange pipeline is a plain tube or a corrugated tube; And / or, the first heat exchange pipeline adopts a copper tube.

5. The heat exchanger according to claim 1, characterized in that The second heat exchange pipeline is constructed with at least two heat exchange layers opposite to the main heat exchange component along the first direction, each of the heat exchange layers includes a plurality of second heat exchange tubes arranged side by side and spaced apart along the second direction, the second heat exchange tubes of two adjacent heat exchange layers are staggered, and the first direction intersects with the second direction.

6. The heat exchanger according to claim 1, characterized in that The second heat exchange pipeline is a spiral coil structure or a serpentine tube structure formed by integrally winding a single tube.

7. The heat exchanger according to claim 1, characterized in that: The first heat exchange pipeline includes a plurality of first heat exchange tubes arranged side by side and spaced apart from each other, and the main heat exchange component also includes a fin group sleeved on the outer periphery of the plurality of first heat exchange tubes.

8. The heat exchanger according to any one of claims 1 to 7, characterized in that: The condensing heat exchange component is located below the main heat exchange component and downstream of the main heat exchange component in the flue gas flow direction.

9. The heat exchanger according to claim 8, characterized in that The heat exchanger also includes an inlet pipe and an outlet pipe. The inlet end of the second heat exchange pipeline is connected to the inlet pipe, and the outlet end of the first heat exchange pipeline is connected to the outlet pipe. The outlet pipe includes a lifting section, and the lowest height of the lifting section inside the pipe is not less than the highest height of the first heat exchange pipeline inside the pipe.

10. A water heater, characterized in that: include: The heat exchanger according to any one of claims 1 to 9; as well as A burner is located on a side of the main heat exchange component away from the condensing heat exchange component.

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