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, which comprises a first heat exchange pipeline and a fin group sleeved on the periphery of the first heat exchange pipeline, the first heat exchange pipeline comprises a first heat exchange pipe; 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 second heat exchange pipe; the outer diameter of the second heat exchange tube is larger than that of the first heat exchange tube. According to the technical scheme provided by the utility model, two-stage heat exchange is realized through a simpler heat exchanger structure, latent heat of low-temperature flue gas can be fully utilized, 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 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 of 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 as a whole. In addition, the heat exchange efficiency between the condensing heat exchanger and the low-temperature flue gas is not high, which affects the overall heat exchange efficiency. 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 make full use of the latent heat of low-temperature flue gas and improve the heat exchange efficiency.

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

[0005] A main heat exchange assembly, comprising a first heat exchange pipeline and a fin group sleeved on the periphery of the first heat exchange pipeline, wherein the first heat exchange pipeline comprises a first heat exchange tube; and

[0006] The condensing heat exchange component is located on one side of the main heat exchange component, and 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 second heat exchange tube, and the outer diameter of the second heat exchange tube is larger than the outer diameter of the first heat exchange tube.

[0007] In one embodiment, the inner diameter of the second heat exchange tube is larger than the inner diameter of the first heat exchange tube.

[0008] In one embodiment, the second heat exchange pipeline includes a pipeline body and a water inlet and a water outlet respectively arranged at both ends of the pipeline body, and a plurality of second heat exchange tubes are connected in series in sequence to form the pipeline body. The outer diameter of the water inlet and the outer diameter of the water outlet are both smaller than the outer diameter of the second heat exchange tube. The water inlet is used to connect to a water inlet pipe, and the water outlet is connected to the water inlet end of the first heat exchange pipeline through a connecting pipe.

[0009] In one embodiment, the first heat exchange tube is a copper tube, and the second heat exchange tube is a stainless steel tube;

[0010] And / or, the second heat exchange tube is a plain tube or a corrugated tube.

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

[0012] In one embodiment, the distance between two adjacent second heat exchange tubes in the same heat exchange layer is not less than 1 mm and not more than 3 mm.

[0013] In one embodiment, at least two layers of the heat exchange layer are spaced apart along the first direction, and the second heat exchange tubes of two adjacent layers of the heat exchange layer are staggered.

[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 main heat exchange assembly further comprises a spoiler disposed in at least one of the first heat exchange tubes;

[0016] And / or, the heat exchanger also includes an inlet pipe, an outlet pipe and a bypass pipe, the inlet end of the second heat exchange pipeline is connected to the inlet pipe, the outlet end of the first heat exchange pipeline is connected to the outlet pipe, and the bypass pipe connects the second heat exchange pipeline with the outlet pipe.

[0017] The utility model also provides a water heater, comprising:

[0018] A heat exchanger as described above; and

[0019] A burner is located on a side of the main heat exchange component away from the condensing heat exchange component.

[0020] 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 main heat exchange component is a tube-fin heat exchange structure formed by a combination of a first heat exchange pipeline and a fin group, and has a higher heat exchange efficiency; the condensing heat exchange component is a simpler tube heat exchange structure formed by a second heat exchange pipeline, occupies less space, and the outer diameter of the second heat exchange tube is larger than the outer diameter of the first heat exchange tube, so that the second heat exchange tube 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, thereby improving the condensation heat exchange efficiency, and then improving the overall heat exchange efficiency of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] Figure 1 A schematic structural diagram of an embodiment of a heat exchanger provided by the utility model;

[0023] Figure 2 for Figure 1 The main view of the heat exchanger (some fins are omitted);

[0024] Figure 3 for Figure 1 Schematic diagram of the cross-section structure of the heat exchanger (without the fin group);

[0025] Figure 4 for Figure 1 A schematic diagram of the cross-sectional structure of the heat exchanger from another perspective;

[0026] Figure 5 This is a structural schematic diagram of an embodiment of a second heat exchange pipeline of a heat exchanger provided by the utility model.

[0027] Description of Figure Numbers:

[0028] 100, heat exchanger; 10, main heat exchange assembly; 11, first heat exchange pipeline; 111, first heat exchange tube; 12, fin group; 121, fin; 13, spoiler; 20, condensing heat exchange assembly; 21, second heat exchange pipeline; 211, second heat exchange tube; 212, water inlet; 213, water outlet; 20a, first heat exchange layer; 20b, second heat exchange layer; 30, connecting pipe; 40, end plate; 50, water inlet pipe; 60, water outlet pipe; 61, lifting section; 70, bypass pipe.

[0029] 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

[0030] 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 in 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.

[0031] 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.

[0032] 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.

[0033] 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 utilize 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, the heat exchange efficiency between the condensing heat exchanger and the low-temperature flue gas is not high, and the latent heat of the low-temperature flue gas cannot be fully utilized.

[0034] 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 make full use of the latent heat of low-temperature flue gas, thereby improving heat exchange efficiency.

[0035] See also Figures 1 to 4 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 and a fin group 12 sleeved on the outer periphery of the first heat exchange pipeline 11, and the first heat exchange pipeline 11 includes a first heat exchange tube 111; 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 end of the second heat exchange pipeline 21 is connected to the water inlet end of the first heat exchange pipeline 11, and the second heat exchange pipeline 21 includes a second heat exchange tube 211, and the outer diameter of the second heat exchange tube 211 is larger than the outer diameter of the first heat exchange tube 111.

[0036] 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.

[0037] The main heat exchange component 10 adopts a tube-fin heat exchange structure. A fin group 12 is provided on the outer periphery of 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 flue gas to pass through, which can increase the contact area with the high-temperature flue gas and improve the heat exchange efficiency. The first heat exchange pipeline 11 includes a first heat exchange tube 111. A plurality of first heat exchange tubes 111 can be provided. The plurality of first heat exchange tubes 111 can be connected in series or in parallel. For example, Figure 3 and Figure 4 As shown, the first heat exchange pipeline 11 includes a plurality of first heat exchange tubes 111 arranged side by side and spaced apart, and the plurality of first heat exchange tubes 111 are connected in series through connecting elbows. A plurality of fins 121 are arranged along the extension direction of the first heat exchange tubes 111 to form a fin group 12, and each fin 121 is provided with a plurality of perforations, wherein the number of perforations matches the number of the first heat exchange tubes 111. For example, Figure 4 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.

[0038] like Figure 1 and Figure 5 As shown, the condensing heat exchange assembly 20 adopts a tubular heat exchange structure, which has a simpler structure and occupies less space. The second heat exchange pipeline 21 includes a second heat exchange tube 211. A plurality of second heat exchange tubes 211 may be provided, and the plurality of second heat exchange tubes 211 may be connected in series or in parallel. A plurality of second heat exchange tubes 211 may be welded or spliced ​​to form the second heat exchange pipeline 21, or the second heat exchange pipeline 21 may be integrally wound from a single tube to form a plurality of second heat exchange tubes 211 connected in series. Optionally, the second heat exchange pipeline 21 is integrally wound from a single 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 ​​through a plurality of tubes, which can reduce the risk of water leakage. Since the outer diameter of the second heat exchange tube 211 is larger than that of the first heat exchange tube 111, the second heat exchange tube 211 has a larger surface area, thereby increasing the heat exchange area on the side in contact with the flue gas, so that the vaporization latent heat in the low-temperature flue gas can be fully utilized, improving the condensation heat exchange efficiency, and thus improving the overall heat exchange efficiency of the heat exchanger 100. The specific sizes of the first heat exchange tube 111 and the second heat exchange tube 211 can be set according to actual needs and are not specifically limited here.

[0039] The technical solution of the utility model integrates the main heat exchange component 10 and the condensing heat exchange component 20 into one 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 main heat exchange component 10 is a tube-fin heat exchange structure formed by the combination of the first heat exchange pipeline 11 and the fin group 12, and has a higher heat exchange efficiency; the condensing heat exchange component 20 is a simpler tube heat exchange structure formed by the second heat exchange pipeline 21, which occupies less space, and the outer diameter of the second heat exchange tube 211 is larger than the outer diameter of the first heat exchange tube 111, so that the second heat exchange tube 211 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, the condensation heat exchange efficiency is improved, and then the overall heat exchange efficiency of the heat exchanger 100 can be improved.

[0040] In one embodiment, the inner diameter of the second heat exchange tube 211 is larger than the inner diameter of the first heat exchange tube 111. In this embodiment, since the outer diameter of the second heat exchange tube 211 is larger than the outer diameter of the first heat exchange tube 111, and the inner diameter of the second heat exchange tube 211 is larger than the inner diameter of the first heat exchange tube 111, the wall of the second heat exchange tube 211 is not too thick, which is conducive to heat conduction. In addition, the larger inner diameter of the second heat exchange tube 211 is also conducive to increasing the water flow through the second heat exchange tube 211.

[0041] like Figure 2 and Figure 5 As shown, in one embodiment, the second heat exchange pipeline 21 includes a pipeline body and a water inlet portion 212 and a water outlet portion 213 respectively arranged at both ends of the pipeline body, and a plurality of second heat exchange tubes 211 are connected in series in sequence to form the pipeline body. The outer diameter size of the water inlet portion 212 and the outer diameter size of the water outlet portion 213 are both smaller than the outer diameter size of the second heat exchange tube 211. The water inlet portion 212 is used to connect to the water inlet pipe 50, and the water outlet portion 213 is connected to the water inlet end of the first heat exchange pipeline 11 through the connecting pipe 30.

[0042] In this embodiment, the outer diameter of the water inlet 212 is smaller than the outer diameter of the second heat exchange tube 211, so that the water inlet 212 can be more conveniently connected to the water inlet tube 50 with a relatively small diameter, and the outer diameter of the water outlet 213 is smaller than the outer diameter of the second heat exchange tube 211, so that the water outlet 213 can be more conveniently connected to the connecting tube 30 with a relatively small diameter, and then connected to the first heat exchange pipeline 11 through the connecting tube 30. Optionally, as Figure 3 As shown, the water outlet 213 of the second heat exchange pipeline 21 and the water inlet end of the first heat exchange pipeline 11 face the same side of the heat exchanger 100, and the connecting pipe 30 is arranged in a curved pipe, one end of the connecting pipe 30 is sealed and plugged into the water outlet 213, and the other end of the connecting pipe 30 is sealed and plugged into the first heat exchange pipeline 11, so that the length of the connecting pipe 30 can be shortened, which is conducive to reducing the volume. Optionally, the water inlet 212, the pipeline body and the water outlet 213 are integrally formed, which can simplify the structure of the second heat exchange pipeline 21 and reduce the risk of water leakage.

[0043] In order to further simplify the structure of the heat exchanger 100, Figure 2 As shown, in one embodiment, the heat exchanger 100 also includes two end plates 40 arranged opposite to each other, the main heat exchange component 10 is installed between the two end plates 40, the pipeline body is located between the two end plates 40, and the two end plates 40 are respectively provided with positioning holes for the water inlet part 212 and the water outlet part 213 to pass through.

[0044] In this embodiment, the main heat exchange component 10 and the condensing heat exchange component 20 can be supported and fixed at the same time by two end plates 40, so that the assembly structure of the heat exchanger 100 is simpler and more compact, which is conducive to further reducing the volume of the heat exchanger 100. Among them, the two end plates 40 are respectively provided with mounting holes for the two ends of the first heat exchange tube 111 to pass through, and the outer side of each end plate 40 is provided with a connecting elbow connecting two adjacent first heat exchange tubes 111, so as to achieve the support and positioning of the first heat exchange pipeline 11. The water inlet 212 and the water outlet 213 of the second heat exchange pipeline 21 are respectively passed through the positioning holes of the two end plates 40, so as to achieve the support and positioning of the second heat exchange pipeline 21. Optionally, the first heat exchange pipeline 11 is welded and fixed to the second heat exchange pipeline 21. In order to facilitate the welding of the two pipelines, optionally, the positioning hole on one of the end plates 40 is a semicircular hole with a notch to facilitate the welding operation.

[0045] In one embodiment, the first heat exchange tube 111 is a copper tube, and the second heat exchange tube 211 is a stainless steel tube. In this way, the main heat exchange component 10 is a copper tube fin structure, which can utilize the high thermal conductivity of copper and the enhanced heat exchange energy of the fins 121 to enhance the heat exchange, so as to fully utilize the sensible heat energy of the flue gas. The condensation heat exchange component 20 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 211. Of course, in some embodiments, the first heat exchange tube 111 and the second heat exchange tube 211 can also be copper tubes, and the outer surface of the second heat exchange tube 211 is provided with an anti-corrosion layer.

[0046] In one embodiment, the second heat exchange tube 211 is a smooth tube or a corrugated tube. For example, the second heat exchange tube 211 may be a smooth tube, the surface of which is smoother, which is conducive to the rapid dripping of condensed water and avoids condensed water blockage. Alternatively, the second heat exchange tube 211 is a corrugated tube with a wrinkled surface, which can increase the heat exchange area and further improve the heat exchange efficiency. It is worth noting that when the second heat exchange tube 211 is a corrugated tube, the outer diameter of the second heat exchange tube 211 refers to the maximum size corresponding to the raised part of the surface wrinkles of the second heat exchange tube 211.

[0047] In one embodiment, the second heat exchange pipeline 21 is constructed to form at least one heat exchange layer opposite to the main heat exchange component 10 along the first direction, and each heat exchange layer includes a plurality of second heat exchange tubes 211 arranged side by side and spaced apart along the second direction, and the first direction intersects with the second direction.

[0048] In this embodiment, the specific number of heat exchange layers can be a single layer, two 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. The plurality of 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 to exchange heat with the plurality of second heat exchange tubes 211 in the heat exchange layer, which is beneficial to improve the heat exchange efficiency. A gap is formed between two adjacent second heat exchange tubes 211 in the same heat exchange layer, which can ensure that the condensed water generated on the surface of the second heat exchange tube 211 can be discharged smoothly from the gap to avoid condensed water blockage.

[0049] Optionally, the distance between two adjacent second heat exchange tubes 211 in the same heat exchange layer is not less than 1 mm and not more than 3 mm. Figure 4 As shown, the spacing between two adjacent second heat exchange tubes 211 in the same heat exchange layer is L, where 1mm≤L≤3mm. In this way, the spacing between two adjacent second heat exchange tubes 211 is not too small, which is conducive to the smooth discharge of condensed water, and the spacing between two adjacent second heat exchange tubes 211 is not too large. When the area of ​​the heat exchange layer remains unchanged, more second heat exchange tubes 211 can be arranged as much as possible to improve the heat exchange efficiency. For example, the spacing between two adjacent second heat exchange tubes 211 in the same heat exchange layer can be 1 mm, 2 mm, 3 mm, etc.

[0050] In order to further improve the heat transfer efficiency, Figure 4 As shown, in one embodiment, the heat exchange layer is arranged with at least two layers at intervals along the first direction, and the second heat exchange tubes 211 of the two adjacent heat exchange layers are arranged in a staggered manner. For example, the heat exchange layer may include a first heat exchange layer 20a and a second heat exchange layer 20b arranged in an interval, 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 can 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 avoided to completely overlap, 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.

[0051] Optionally, the second heat exchange pipeline 21 can be made of a single pipe to form multiple heat exchange layers. Figure 5 As shown, the multiple second heat exchange tubes 211 of the first heat exchange layer 20a and the multiple second heat exchange tubes 211 of the second heat exchange layer 20b are alternately connected, so that the second heat exchange pipeline 21 extends a certain distance in the first heat exchange layer 20a, then bends to the second heat exchange layer 20b to extend a certain distance, then bends to the first heat exchange layer 20a to extend a certain distance, then bends 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. Of course, in other embodiments, a part of the second heat exchange pipeline 21 can also 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 is bent and wound in the second heat exchange layer 20b to form a second serpentine pipeline, so that the second heat exchange pipeline 21 has a serpentine pipeline structure in each heat exchange layer.

[0052] like Figure 1 and 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.

[0053] 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 direction of flue gas flow. 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. Among them, the main heat exchange component 10 adopts a tube-fin heat exchange structure, and a fin group 12 is provided on the periphery of the first heat exchange pipeline 11, so that the contact area with the high-temperature flue gas can be increased and the heat exchange efficiency can be improved. 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 no condensed water will 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.

[0054] In order to further improve the heat exchange efficiency of the main heat exchange component 10, based on the above embodiment, as Figure 3 As shown, in one embodiment, the main heat exchange assembly 10 further includes a spoiler 13 disposed in at least one of the first heat exchange tubes 111. By providing the spoiler 13, the flow path of the water flow in the first heat exchange tube 111 can be extended, the spoiler effect can be enhanced, and the contact time between the high-temperature flue gas and the water can be increased, so that the heat exchange between the high-temperature flue gas and the water is more sufficient. Optionally, each first heat exchange tube 111 is provided with a spoiler 13, which can further enhance the heat exchange.

[0055] Based on the above embodiments, Figure 2 As shown, in one embodiment, the heat exchanger 100 also includes an inlet pipe 50, an outlet pipe 60 and a bypass pipe 70, the inlet end of the second heat exchange pipeline 21 is connected to the inlet pipe 50, the outlet end of the first heat exchange pipeline 11 is connected to the outlet pipe 60, and the bypass pipe 70 connects the second heat exchange pipeline 21 with the outlet pipe 60.

[0056] In this embodiment, when the heat exchanger 100 is working, the external cold water is transported from the water inlet pipe 50 to the second heat exchange pipeline 21 for latent heat exchange with the flue gas, and then flows to the first heat exchange pipeline 11 for sensible heat exchange with the flue gas. The heated hot water is output from the water outlet pipe 60 to provide hot water for the user. When the water outlet pipe 60 outputs hot water, the water with a relatively low temperature in the second heat exchange pipeline 21 can flow into the water outlet pipe 60 through the bypass pipe 70 for mixing, thereby reducing the water-off 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 the connecting pipe 30, and one end of the bypass pipe 70 is connected to the connecting pipe 30, and the other end is connected to the water outlet pipe 60.

[0057] 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 11 may flow out from the water outlet pipe 60 without filling the entire tube cavity. Since the water in the first heat exchange tube 111 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.

[0058] In order to reduce the evaporation noise of the water heater, Figure 2As shown, in one embodiment, the first heat exchange pipeline 11 is located above the second heat exchange pipeline 21, and the outlet pipe 60 includes a lifting section 61, and the lowest height of the lifting section 61 is not less than the highest height of the first heat exchange pipeline 11. In this way, when the heat exchanger 100 flows out through the 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 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 filled 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 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 heat exchanger 100 when in use.

[0059] 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.

[0060] 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.

[0061] 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 and a fin group sleeved on the periphery of the first heat exchange pipeline, wherein the first heat exchange pipeline comprises a first heat exchange tube; and The condensing heat exchange component is located on one side of the main heat exchange component, and 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 second heat exchange tube, and the outer diameter of the second heat exchange tube is larger than the outer diameter of the first heat exchange tube.

2. The heat exchanger according to claim 1, characterized in that The inner diameter of the second heat exchange tube is larger than the inner diameter of the first heat exchange tube.

3. The heat exchanger according to claim 1, characterized in that The second heat exchange pipeline includes a pipeline body and a water inlet and a water outlet respectively arranged at both ends of the pipeline body. A plurality of second heat exchange tubes are connected in series in sequence to form the pipeline body. The outer diameter of the water inlet and the outer diameter of the water outlet are both smaller than the outer diameter of the second heat exchange tube. The water inlet is used to connect the water inlet pipe, and the water outlet is connected to the water inlet end of the first heat exchange pipeline through a connecting pipe.

4. The heat exchanger according to claim 1, characterized in that The first heat exchange tube is made of copper tube, and the second heat exchange tube is made of stainless steel tube; And / or, the second heat exchange tube is a plain tube or a corrugated tube.

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

6. The heat exchanger according to claim 5, characterized in that The distance between two adjacent second heat exchange tubes in the same heat exchange layer is not less than 1 mm and not more than 3 mm.

7. The heat exchanger according to claim 5, characterized in that The heat exchange layer is provided with at least two layers at intervals along the first direction, and the second heat exchange tubes of two adjacent layers of the heat exchange layer are staggered.

8. The heat exchanger according to claim 1, 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 any one of claims 1 to 8, characterized in that: The main heat exchange assembly further includes a spoiler disposed in at least one of the first heat exchange tubes; And / or, the heat exchanger also includes an inlet pipe, an outlet pipe and a bypass pipe, the inlet end of the second heat exchange pipeline is connected to the inlet pipe, the outlet end of the first heat exchange pipeline is connected to the outlet pipe, and the bypass pipe connects the second heat exchange pipeline with the 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 main heat exchange component away from the condensing heat exchange component.

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