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 first heat exchange assembly comprising a first heat exchange pipeline and a fin group sleeved on the periphery of the first heat exchange pipeline; the second heat exchange assembly is located on one side of the first heat exchange assembly, at least two heat exchange layers opposite to the first heat exchange assembly are constructed on the second heat exchange assembly, the second heat exchange assembly comprises a second heat exchange pipeline, and the second heat exchange pipeline communicates with the first heat exchange pipeline; the second heat exchange pipeline is arranged in at least one heat exchange layer in a reciprocating and circuitous mode to form a snakelike pipeline. According to the technical scheme, under the condition that two-stage heat exchange is achieved, the structure of the heat exchanger can be simplified, the size is reduced, and the heat exchange efficiency is improved.

Description

Technical Field

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

[0002] Under the background 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 utilize the latent heat of vaporization of flue gas and increase condensing heat transfer. In related technologies, some gas water heaters include a main heat exchanger and a condensing heat exchanger, which can achieve two-stage heat transfer of main heat transfer and condensing heat transfer. However, the main heat exchanger and the condensing heat exchanger generally adopt a split design, with a complex structure and a large overall occupied space, which is not conducive to the miniaturization of the volume of the water heater. Summary of the Utility Model

[0003] The main purpose of the utility model is to propose a heat exchanger and a water heater, aiming to simplify the structure of the heat exchanger, reduce the volume and improve the heat transfer efficiency under the condition of realizing two-stage heat transfer.

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

[0005] A first heat exchange component, including a first heat exchange pipeline and a fin group sleeved on the periphery of the first heat exchange pipeline; and

[0006] A second heat exchange component, located on one side of the first heat exchange component, the second heat exchange component is configured to have at least two heat exchange layers opposite to the first heat exchange component, the second heat exchange component includes a second heat exchange pipeline, the second heat exchange pipeline is communicated with the first heat exchange pipeline, and the second heat exchange pipeline is reciprocally meandered in a serpentine pipeline arrangement in at least one of the heat exchange layers.

[0007] In an embodiment, the second heat exchange component is located below the first heat exchange component and is downstream of the first heat exchange component in the flue gas flow direction, and the water outlet end of the second heat exchange pipeline is communicated with the water inlet end of the first heat exchange pipeline.

[0008] In an embodiment, the second heat exchange pipeline reciprocally meanders in a serpentine pipeline in one of the heat exchange layers and then extends to reciprocally meander in a serpentine pipeline in an adjacent another heat exchange layer, so that the serpentine pipelines of each heat exchange layer are connected in series.

[0009] In an embodiment, the second heat exchange pipeline includes a plurality of second heat exchange tubes, each second heat exchange tube extends along a first direction, the plurality of second heat exchange tubes located in the same heat exchange layer are arranged at intervals along a second direction and are connected in series to form a serpentine pipeline, and the second heat exchange tubes of adjacent two heat exchange layers are arranged in a staggered manner; the first direction and the second direction intersect.

[0010] In one embodiment, the second heat exchange pipeline is formed by winding a single plain tube or a corrugated tube.

[0011] In one embodiment, the first heat exchange pipeline is made of a copper tube, and the second heat exchange pipeline is made of a stainless steel tube.

[0012] In one embodiment, the heat exchanger further includes a first end plate and a second end plate, the first heat exchange pipeline includes a plurality of first heat exchange tubes located between the first end plate and the second end plate, each of the first heat exchange tubes extends along a first direction, and the plurality of first heat exchange tubes are arranged at intervals and connected along a second direction, and the fin group is interspersed with the plurality of first heat exchange tubes; the first direction and the second direction intersect.

[0013] In one embodiment, the heat exchanger further includes a water inlet pipe and a water outlet pipe, the water inlet pipe is connected to the water inlet end of the 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 water outlet end of the first heat exchange pipeline is connected to the water outlet pipe, the first end plate is provided with a first positioning hole for the water inlet end of the second heat exchange pipeline to pass through, and the second end plate is provided with a second positioning hole for the water outlet end of the second heat exchange pipeline to pass through.

[0014] In one embodiment, the heat exchanger further includes a bypass pipe, and the bypass pipe connects the second heat exchange pipeline with the water outlet pipe.

[0015] The utility model also provides a water heater, comprising:

[0016] A heat exchanger as described above; and

[0017] A burner is located on a side of the first heat exchange component facing away from the second heat exchange component.

[0018] The technical solution of the utility model integrates the first heat exchange component and the second heat exchange component into one heat exchanger. One of the first heat exchange component and the second heat exchange component can be used as the main heat exchange component, and the other can be used as the condensing heat exchange component. The integrated heat exchanger realizes two-stage heat exchange, so that the overall structure of the heat exchanger is simpler and more compact, which is conducive to reducing the volume. The first heat exchange component is a tube-fin heat exchange structure formed by the combination of the first heat exchange pipeline and the fin group, which has a higher heat exchange efficiency. The second heat exchange component is a simpler tube heat exchange structure formed by the second heat exchange pipeline, which occupies less space. The second heat exchange component constructs at least two heat exchange layers, and the second heat exchange pipeline is arranged in a serpentine pipeline in at least one of the heat exchange layers. The length of the second heat exchange pipeline can be extended as much as possible within a limited space, the heat exchange area can be increased, and the heat exchange efficiency can be improved. In this way, when the heat exchanger realizes two-stage heat exchange, the structure of the heat exchanger can be simplified, the volume can be reduced, and the heat exchange efficiency can be improved. Brief Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0020] Figure 1 Structural schematic diagram of an embodiment of the heat exchanger provided by the present invention;

[0021] Figure 2 is Figure 1 front view of the heat exchanger in (some fins are omitted);

[0022] Figure 3 is Figure 1 cross-sectional structural schematic diagram of the heat exchanger in ;

[0023] Figure 4 is Figure 1 exploded structural schematic diagram of the heat exchanger in .

[0024] Explanation of the reference numerals in the drawings:

[0025] 100, heat exchanger; 10, first heat exchange component; 11, first heat exchange pipeline; 111, first heat exchange tube; 112, connecting elbow; 12, fin group; 121, fin; 20, second heat exchange component; 20a, first heat exchange layer; 20b, second heat exchange layer; 21, second heat exchange pipeline; 211, second heat exchange tube; 30, first end plate; 31, first mounting hole; 32, first positioning hole; 40, second end plate; 41, second mounting hole; 42, second positioning hole; 50, water inlet pipe; 60, water outlet pipe; 61, lifting section; 70, bypass pipe.

[0026] The realization of the objectives, functional features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the drawings. Detailed Embodiments

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0028] 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.

[0029] 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.

[0030] 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, the main heat exchanger and condensing heat exchanger of some water heaters adopt a split design, which has a complex structure and occupies a large space as a whole, which is not conducive to the miniaturization of the water heater; and the main heat exchanger and condensing heat exchanger usually 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, which is not conducive to improving heat exchange efficiency.

[0031] Based on this, the present invention proposes a heat exchanger 100, which can simplify the structure of the heat exchanger 100, reduce the volume, and improve the heat exchange efficiency while realizing two-stage heat exchange.

[0032] See also Figures 1 to 3 In one embodiment of the utility model, the heat exchanger 100 includes a first heat exchange component 10 and a second heat exchange component 20, the first heat exchange component 10 includes a first heat exchange pipeline 11 and a fin group 12 sleeved on the periphery of the first heat exchange pipeline 11; the second heat exchange component 20 is located on one side of the first heat exchange component 10, and the second heat exchange component 20 constructs at least two heat exchange layers opposite to the first heat exchange component 10, the second heat exchange component 20 includes a second heat exchange pipeline 21, the second heat exchange pipeline 21 is connected to the first heat exchange pipeline 11, and the second heat exchange pipeline 21 is reciprocated and circuitously arranged in a serpentine pipeline in at least one of the heat exchange layers.

[0033] The heat exchanger 100 includes a first heat exchange component 10 and a second heat exchange component 20. The second heat exchange component 20 is located on one side of the first heat exchange component 10 in the flue gas flow direction. 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 first heat exchange component 10 facing away from the second heat exchange component 20, so that the second heat exchange component 20 is located downstream of the first heat exchange component 10 in the flue gas flow direction. In this way, the high-temperature flue gas first passes through the surface of the first heat exchange component 10 for heat exchange, and then passes through the surface of the second heat exchange component 20 for condensation heat exchange. At this time, the first heat exchange component 10 can be used as the main heat exchange component, and the second heat exchange component 20 can be used as the condensation heat exchange component. 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. Another example is that in other application scenarios, the burner of the water heater can also be arranged on the side of the second heat exchange component 20 facing away from the first heat exchange component 10, so that the first heat exchange component 10 is located downstream of the second heat exchange component 20 in the flue gas flow direction. In this way, the high-temperature flue gas first passes through the surface of the second heat exchange component 20 for heat exchange, and then passes through the surface of the first heat exchange component 10 for condensation heat exchange. At this time, the second heat exchange component 20 can be used as the main heat exchange component, and the first heat exchange component 10 can be used as the condensation heat exchange component.

[0034] Among them, the first heat exchange component 10 adopts a finned tube heat exchange structure. A fin group 12 is sleeved around the first heat exchange pipeline 11. The fin group 12 generally includes a plurality of fins 121 arranged side by side. There is a small gap between two adjacent fins 121 for the flue gas to pass through. In this way, the contact area with the high-temperature flue gas can be increased, and the heat exchange efficiency can be improved. The second heat exchange component 20 adopts a tubular heat exchange structure, which is simpler in structure and occupies less space. The second heat exchange component 20 constructs at least two heat exchange layers opposite to the first heat exchange component 10. Among them, the number of heat exchange layers can be set to two, three or more according to needs. Each heat exchange layer can be connected in series or in parallel, which is not specifically limited here. The second heat exchange pipeline 21 is arranged in a serpentine pipeline in a reciprocating and circuitous manner in at least one of the heat exchange layers, which can extend the length of the second heat exchange pipeline 21 as much as possible in a limited space, increase the heat exchange area, and improve the heat exchange efficiency.

[0035] The technical solution of the present utility model integrates the first heat exchange component 10 and the second heat exchange component 20 on a heat exchanger 100. One of the first heat exchange component 10 and the second heat exchange component 20 can be used as the main heat exchange component, and the other as the condensation heat exchange component. Two-stage heat exchange is achieved through the integrated heat exchanger 100, making the overall structure of the heat exchanger 100 simpler and more compact, which is beneficial to reducing the volume. Moreover, the first heat exchange component 10 is a tube-fin heat exchange structure formed by combining the first heat exchange pipeline 11 and the fin group 12, having a relatively high heat exchange efficiency. The second heat exchange component 20 is a tube heat exchange structure with a simpler structure, occupying less space. The second heat exchange component 20 is configured with at least two heat exchange layers, and the second heat exchange pipeline 21 is reciprocally meandered in a serpentine pipeline arrangement in at least one of the heat exchange layers, capable of extending the length of the second heat exchange pipeline 21 as much as possible within a limited space, increasing the heat exchange area, and improving the heat exchange efficiency. In this way, when the heat exchanger 100 realizes two-stage heat exchange, the structure of the heat exchanger 100 can be simplified, the volume can be reduced, and the heat exchange efficiency can be improved.

[0036] In the related art, a large amount of condensed water is generated on the surface of the condensation heat exchanger. When the condensation heat exchanger adopts a tube-fin heat exchange structure, the condensed water is easily accumulated in the gaps between adjacent fins and cannot be discharged smoothly. Thus, it will cause blockage by the condensed water, and the flue gas cannot contact the surface of the heat exchange pipeline, affecting the heat exchange efficiency.

[0037] To avoid blockage by the condensed water, as Figure 1 and Figure 2 shown, in an embodiment, the second heat exchange component 20 is located below the first heat exchange component 10 and is downstream of the first heat exchange component 10 in the flue gas flow direction. The water outlet end of the second heat exchange pipeline 21 is communicated with the water inlet end of the first heat exchange pipeline 11.

[0038] In this embodiment, the heat exchanger 100 can be applied to a gas water heater with an inverted burner. The burner is located above the heat exchanger 100, and the flue gas generated by the combustion of the burner flows from top to bottom and exchanges heat with the first heat exchange component 10 and the second heat exchange component 20 in sequence. The water outlet end of the second heat exchange pipeline 21 is communicated with the water inlet end of the first heat exchange pipeline 11. The water inlet end of the second heat exchange pipeline 21 can be used to access cold water, and the water outlet end of the second heat exchange pipeline 21 can be used to output hot water. The water flow then flows along the path of the water inlet of the heat exchanger 100, the second heat exchange pipeline 21, the first heat exchange pipeline 11, and then to the water outlet of the heat exchanger 100. In this way, the latent heat of vaporization of the flue gas can be used to preheat the cold water in the second heat exchange pipeline 21, and the preheated water is transported to the first heat exchange pipeline 11 and exchanges heat with the high-temperature flue gas upstream to output hot water. Among them, the first heat exchange component 10 serves as the main heat exchange component, and the second heat exchange component 20 serves as the condensation heat exchange component. The temperature of the flue gas after exchanging heat with the first heat exchange component 10 is generally higher than the flue gas dew point temperature by a certain margin, and no condensed water will be generated on the surface of the first heat exchange component 10. Therefore, the first heat exchange component 10 adopts a finned tube heat exchange structure, and there will be no problem of condensed water accumulation in the gaps of the fins 121 causing blockage. The flue gas after exchanging heat with the first heat exchange component 10 flows to the second heat exchange component 20, and condensation heat exchange will occur when the low-temperature flue gas in this section encounters cold. The second heat exchange component 20 adopts a tubular heat exchange structure, and there are no fins 121 outside the second heat exchange pipeline 21, so that the condensed water generated on the surface of the second heat exchange pipeline 21 can quickly drip; moreover, the second heat exchange component 20 is located below the first heat exchange component 10, and the condensed water dripping from the second heat exchange component 20 will not drip into the gaps of the fins 121 of the first heat exchange component 10 and accumulate. In this way, while improving the heat exchange efficiency, the risk of condensed water blockage can be effectively reduced.

[0039] Of course, in some embodiments, when the flue gas flow direction is from bottom to top, the second heat exchange component 20 can also be arranged above the first heat exchange component 10. In this case, a drainage structure can be provided below the second heat exchange component 20 to drain the condensed water dripping from the second heat exchange component 20 to a preset position for discharge, so as to prevent the condensed water from directly dripping onto the surface of the first heat exchange component 10.

[0040] The following mainly takes the flue gas flowing from top to bottom and the second heat exchange component 20 being located below the first heat exchange component 10 as an example for illustration.

[0041] To further improve the heat exchange efficiency, as Figures 2 to 4 shown, in one embodiment, at least two layers are arranged at intervals on the heat exchange layer. The second heat exchange pipeline 21 reciprocates and meanders in a serpentine pipeline in one of the heat exchange layers and then extends into an adjacent another heat exchange layer and reciprocates and meanders in a serpentine pipeline, so that the serpentine pipelines of each heat exchange layer are connected in series.

[0042] In this embodiment, the heat exchange layer can be arranged in two, three or more layers in the flue gas flow direction (for example, from top to bottom). In this way, the length of the second heat exchange pipeline 21 can be extended, the heat exchange area can be increased, and the heat exchange efficiency can be improved. For example, the heat exchange layer can include a first heat exchange layer 20a and a second heat exchange layer 20b, and the second heat exchange pipeline 21 can be integrally wound and formed by a single pipe. For example, a part of the second heat exchange pipeline 21 can be bent and wound in the first heat exchange layer 20a to form a first serpentine pipeline, and then another part of the second heat exchange pipeline 21 can be bent into the second heat exchange layer 20b for bending and winding to form a second serpentine pipeline, so that the first serpentine pipeline and the second serpentine pipeline are wound and connected in series by the same pipe. In this way, the manufacturing process of the second heat exchange pipeline 21 can be simplified, so that the second pipeline does not need to be welded or spliced by multiple pipes, and the risk of water leakage can be reduced. Of course, in some other embodiments, the first serpentine pipeline and the second serpentine pipeline can be separately wound by independent heat exchange pipes and then welded or assembled and connected.

[0043] Among them, the number of the second heat exchange pipes 211 in the first heat exchange layer 20a and the number of the second heat exchange pipes 211 in the second heat exchange layer 20b can be the same or different. For example, when the number of the second heat exchange pipes 211 in the first heat exchange layer 20a and the second heat exchange layer 20b is the same, the cross-section of the second heat exchange pipeline 21 in the direction parallel to the flue gas flow direction can present a parallelogram structure as a whole; for another example, when the number of the second heat exchange pipes 211 in the first heat exchange layer 20a and the second heat exchange layer 20b is different, the cross-section of the second heat exchange pipeline 21 in the direction parallel to the flue gas flow direction can present a trapezoidal structure as a whole. Exemplarily, as Figure 3 shown, the number of the second heat exchange pipes 211 in the first heat exchange layer 20a is greater than the number of the second heat exchange pipes 211 in the second heat exchange layer 20b. For example, the first heat exchange layer 20a has 4 second heat exchange pipes 211, the second heat exchange layer 20b has 3 second heat exchange pipes 211, and the second heat exchange pipes 211 in the first heat exchange layer 20a and the second heat exchange pipes 211 in the second heat exchange layer 20b are arranged staggeredly, so that the cross-section of the second heat exchange pipeline 21 in the direction parallel to the flue gas flow direction presents an inverted trapezoidal structure with a wider upper part and a narrower lower part. When applied to a water heater, the heat exchanger 100 is arranged in the flue of the water heater, and the flue can be designed as a funnel-shaped structure adapted to the inverted trapezoidal structure of the above heat exchanger 100, so that the flue gas distribution is more uniform.

[0044] Optionally, as Figure 2 and Figure 3As shown in the figure, the first heat exchange layer 20a is located on the side of the second heat exchange layer 20b close to the first heat exchange assembly 10, and the water outlet end of the second heat exchange pipeline 21 extends out of the first heat exchange layer 20a to be connected to the first heat exchange pipeline 11. In this way, the length of the connecting pipeline between the first heat exchange pipeline 11 and the second heat exchange pipeline 21 can be shortened, which is beneficial to reducing the volume and saving costs.

[0045] As Figure 2 and Figure 3 shown, in an embodiment, the second heat exchange pipeline 21 includes a plurality of second heat exchange tubes 211. Each of the second heat exchange tubes 211 extends along a first direction. The plurality of second heat exchange tubes 211 located in the same heat exchange layer are arranged at intervals along a second direction and are connected in series to form a serpentine pipeline. The second heat exchange tubes 211 of adjacent two heat exchange layers are arranged staggeredly; the first direction and the second direction intersect.

[0046] In this embodiment, the first direction can be the length direction of the heat exchanger 100, and the second direction can be the width direction of the heat exchanger 100. The second heat exchange tubes 211 of adjacent two heat exchange layers are arranged staggeredly. For example, the gaps between the second heat exchange tubes 211 of the first heat exchange layer 20a are opposite to the gaps between two adjacent second heat exchange tubes 211 in the second heat exchange layer 20b. In this way, it can be avoided that the projections of adjacent two heat exchange layers completely coincide in the flue gas flow direction, so that the flue gas can fully contact the surfaces of the second heat exchange tubes 211 of each heat exchange layer during the flow process for heat exchange to improve the heat exchange efficiency; in addition, the condensed water generated on the surfaces of the second heat exchange tubes 211 of the upper heat exchange layer can also drip downward from the gap between two adjacent second heat exchange tubes 211 of the lower heat exchange layer, ensuring that the condensed water can be discharged smoothly.

[0047] Optionally, the second heat exchange pipeline 21 is formed by winding a single smooth tube or a corrugated tube. In this way, the manufacturing process of the second heat exchange pipeline 21 can be simplified, so that the second heat exchange pipeline 21 does not need to be welded or spliced by multiple tubes, and the risk of water leakage can be reduced. Among them, the second heat exchange pipeline 21 can be formed by winding a smooth tube with no special structure on the surface. The surface of the smooth tube is smoother, which is beneficial to the rapid dripping of condensed water and can avoid the blockage of condensed water. Or, the second heat exchange pipeline 21 can also be formed by winding a corrugated tube with a wrinkled structure on the surface. Compared with the smooth tube, the wrinkles on the surface of the corrugated tube can increase the heat exchange area. In this way, when the length of the second heat exchange pipeline 21 is the same, the heat exchange efficiency can be improved. Or, when the same heat exchange efficiency is achieved, the length of the second heat exchange pipeline 21 can be shortened, saving materials and reducing costs. And, compared with the finned tube 121, the depth of the wrinkles on the surface of the corrugated tube is shallower, and it is not easy to accumulate condensed water, avoiding the blockage of condensed water.

[0048] In one embodiment, the first heat exchange pipeline 11 is made of copper pipe, and the second heat exchange pipeline 21 is made of stainless steel pipe. In this way, the first heat exchange assembly 10 has a copper pipe and fin structure, which can utilize the high thermal conductivity of copper and the enhanced heat transfer of the fins 121 to strengthen heat transfer, so as to fully utilize the sensible heat energy of the flue gas. The second heat exchange assembly 20 is a stainless steel pipe heat exchange structure, which can prevent condensate blockage, and stainless steel has good corrosion resistance, which can prevent the condensate from corroding the surface of the second heat exchange pipeline 21. Of course, in some embodiments, both the first heat exchange pipeline 11 and the second heat exchange pipeline 21 can also be made of copper pipes, and an anti-corrosion layer is provided on the outer surface of the second heat exchange pipeline 21. In addition, to simplify the manufacturing process, optionally, the first heat exchange pipeline 11 and the second heat exchange pipeline 21 are fixed by welding.

[0049] Based on the above embodiments, as Figures 1 to 4 shown, in one embodiment, the heat exchanger 100 further includes a first end plate 30 and a second end plate 40. The first heat exchange pipeline 11 includes a plurality of first heat exchange tubes 111 located between the first end plate 30 and the second end plate 40. Each first heat exchange tube 111 extends along a first direction, and the plurality of first heat exchange tubes 111 are arranged at intervals and communicated along a second direction. The fin group 12 is inserted and matched with the plurality of first heat exchange tubes 111; the first direction and the second direction intersect.

[0050] In this embodiment, the first direction may be the length direction of the heat exchanger 100, and the second direction may be the width direction of the heat exchanger 100. A plurality of first heat exchange tubes 111 may be connected in series or in parallel to form a first heat exchange pipeline 11. The plurality of first heat exchange tubes 111 may be arranged in one layer, two layers or more in the flue gas flow 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 may be connected in series through connecting elbows 112 to form a first heat exchange pipeline 11 arranged in a circuitous and extended 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 first heat exchange tubes 111. Exemplarily, 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, and the first heat exchange tubes 111 are inserted and matched with the perforations on the fins 121 in a one-to-one correspondence. Of course, the number of the first heat exchange tubes 111 is not limited to four, and may also be three, five or more, for example. A gap for the 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 oncoming 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 heat the water in the first heat exchange tubes 111, and the heat exchange efficiency can be effectively improved. The first heat exchange pipeline 11 can be supported and fixed by the first end plate 30 and the second end plate 40. For example, the first end plate 30 and the second end plate 40 are respectively provided with a first mounting hole 31 and a second mounting hole 41 for the two ends of the first heat exchange tube 111 to pass through.

[0051] Furthermore, as Figure 2 and Figure 4 shown, in one embodiment, the heat exchanger 100 further includes a water inlet pipe 50 and a water outlet pipe 60. The water inlet pipe 50 is communicated with the water inlet end of the second heat exchange pipeline 21. The water outlet end of the second heat exchange pipeline 21 is communicated with the water inlet end of the first heat exchange pipeline 11. The water outlet end of the first heat exchange pipeline 11 is communicated with the water outlet pipe 60. The first end plate 30 is provided with a first positioning hole 32 for the water inlet end of the second heat exchange pipeline 21 to pass through. The second end plate 40 is provided with a second positioning hole 42 for the water outlet end of the second heat exchange pipeline 21 to pass through.

[0052] In this embodiment, the water inlet end of the second heat exchange pipeline 21 can pass through the first positioning hole 32 to be connected to the water inlet pipe 50, and the water outlet end of the second heat exchange pipeline 21 can pass through the second positioning hole 42 to be connected to the first heat exchange pipeline 11. In this way, through the first end plate 30 and the second end plate 40, not only can the first heat exchange pipeline 11 be supported, but also the second heat exchange pipeline 21 can be supported, which is beneficial to simplifying the structure of the heat exchanger 100, saving materials, reducing costs, and at the same time reducing the volume of the heat exchanger 100. Optionally, the second positioning hole 42 is an arc-shaped hole with a notch to facilitate welding of the first heat exchange pipeline 11 and the second heat exchange pipeline 21.

[0053] Further, as Figure 2 shown, in one embodiment, the heat exchanger 100 further includes a bypass pipe 70, and the bypass pipe 70 communicates the second heat exchange pipeline 21 with the water outlet pipe 60. In this way, when the water outlet pipe 60 outputs hot water, the relatively low-temperature water in the second heat exchange pipeline 21 can flow into the water outlet pipe 60 through the bypass pipe 70 for mixing, so as to reduce the start-stop temperature rise of the heat exchanger 100. For example, the water outlet end of the second heat exchange pipeline 21 is connected to the water inlet end of the first heat exchange pipeline 11 through a connecting pipe, one end of the bypass pipe 70 is connected to the connecting pipe, and the other end is connected to the water outlet pipe 60.

[0054] It can be understood that when the water pressure of the external water source pumped into the heat exchange pipe is insufficient, there may be a situation where the water in the first heat exchange pipeline 11 flows out from the water outlet pipe 60 without filling the entire pipe cavity. Since the water in the first heat exchange pipe 111 cannot fill the voids, when the burner heats the first heat exchange pipeline 11, the water in the pipe evaporates into high-temperature steam and collides with the pipe wall, generating vaporization noise.

[0055] To reduce the vaporization noise of the water heater, as Figure 1 shown, in one embodiment, the first heat exchange pipeline 11 is located above the second heat exchange pipeline 21, and the water outlet pipe 60 includes a lifting section 61, and the lowest height inside the lifting section 61 is not less than the highest height inside the first heat exchange pipeline 11. In this way, when the heat exchanger 100 flows out through the water outlet pipe 60, it will pass through the lifting section 61. When the water level reaches the lifting section 61, since the lowest point of the lifting section 61 is not less than the highest point of the first heat exchange pipeline 11, when the lifting section 61 can intake water, the water level in the first heat exchange pipeline 11 can reach its highest point. Even when the heat exchanger 100 intakes water with a small amount, the first heat exchange pipeline 11 can still be filled with water without leaving voids. When the first heat exchange pipeline 11 is heated, it can avoid the high-temperature vaporization of the water inside and the collision with the pipe wall at the void part to generate vaporization noise, improving the silent effect when the heat exchanger 100 is used.

[0056] The present utility model further provides a water heater, which includes a heat exchanger 100 and a burner. The burner is located on the side of the first heat exchange component 10 away from the second heat exchange component 20. For the specific structure of the heat exchanger 100, reference can be made to the above embodiments. Since this water heater adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0057] In this embodiment, the burner can be located below the heat exchanger 100. Then, the second heat exchange component 20 of the heat exchanger 100 is located above the first heat exchange component 10. The flue gas generated by the combustion of the burner flows upward, and sequentially passes through the first heat exchange component 10 and the second heat exchange component 20 for heat exchange. Alternatively, the burner can be located above the heat exchanger 100. Then, the first heat exchange component 10 of the heat exchanger 100 is located above the second heat exchange component 20. The flue gas generated by the combustion of the burner flows downward, and sequentially passes through the first heat exchange component 10 and the second heat exchange component 20 for heat exchange.

[0058] The above is only an exemplary embodiment of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.

Claims

1. A heat exchanger, characterized in that: include: A first heat exchange component, comprising a first heat exchange pipeline and a fin group sleeved on the periphery of the first heat exchange pipeline; as well as The second heat exchange component is located on one side of the first heat exchange component. The second heat exchange component is constructed with at least two heat exchange layers opposite to the first heat exchange component. The second heat exchange component includes a second heat exchange pipeline. The second heat exchange pipeline is connected to the first heat exchange pipeline. The second heat exchange pipeline is reciprocated and circuitously arranged in a serpentine pipeline in at least one of the heat exchange layers.

2. The heat exchanger according to claim 1, characterized in that The second heat exchange component is located below the first heat exchange component and downstream of the first heat exchange component in the flue gas flow direction, and the water outlet end of the second heat exchange pipeline is connected to the water inlet end of the first heat exchange pipeline.

3. The heat exchanger according to claim 1, characterized in that The second heat exchange pipeline reciprocates and meanders in one of the heat exchange layers to form a serpentine pipeline and then extends to another adjacent heat exchange layer to reciprocate and meander in a serpentine pipeline, so that the serpentine pipelines of each heat exchange layer are connected in series.

4. The heat exchanger according to claim 3, characterized in that The second heat exchange pipeline includes multiple second heat exchange tubes, each of which is extended along the first direction. The multiple second heat exchange tubes located in the same heat exchange layer are arranged at intervals along the second direction and connected in series to form a serpentine pipeline. The second heat exchange tubes of two adjacent heat exchange layers are staggered; the first direction and the second direction intersect.

5. The heat exchanger according to claim 3, characterized in that: The second heat exchange pipeline is formed by winding a single plain tube or a corrugated tube.

6. The heat exchanger according to claim 1, 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.

7. The heat exchanger according to any one of claims 1 to 6, characterized in that: The heat exchanger also includes a first end plate and a second end plate, the first heat exchange pipeline includes a plurality of first heat exchange tubes located between the first end plate and the second end plate, each of the first heat exchange tubes extends along a first direction, the plurality of first heat exchange tubes are arranged at intervals and connected along a second direction, the fin group is interspersed with the plurality of first heat exchange tubes; the first direction and the second direction intersect.

8. The heat exchanger according to claim 7, characterized in that The heat exchanger also includes an inlet pipe and an outlet pipe, the inlet pipe is connected to the water inlet end of the second heat exchange pipeline, the outlet end of the second heat exchange pipeline is connected to the water inlet end of the first heat exchange pipeline, the outlet end of the first heat exchange pipeline is connected to the outlet pipe, the first end plate is provided with a first positioning hole for the water inlet end of the second heat exchange pipeline to pass through, and the second end plate is provided with a second positioning hole for the water outlet end of the second heat exchange pipeline to pass through.

9. The heat exchanger according to claim 8, characterized in that The heat exchanger further includes a bypass pipe, which connects the second heat exchange pipeline with the water outlet 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 first heat exchange component facing away from the second heat exchange component.

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