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, a second heat exchange assembly, a third heat exchange assembly and a fourth heat exchange assembly, the first heat exchange assembly comprises a first heat exchange pipeline and a fin group sleeved on the periphery of the first heat exchange pipeline; the first heat exchange assembly is located on one side of the first heat exchange assembly, the second heat exchange assembly is located on one side of the first heat exchange assembly and comprises a second heat exchange pipeline, the second heat exchange pipeline communicates with the first heat exchange pipeline, and at least part of pipe sections of the second heat exchange pipeline are corrugated pipes. 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, 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, which has a complex structure and occupies a large space as a whole, which is not conducive to the miniaturization of the water heater. Utility Model Content

[0003] The main purpose of the utility model is to provide a heat exchanger and a water heater, which are intended to simplify the structure of the heat exchanger, reduce the volume, and improve the heat exchange efficiency while realizing two-stage heat exchange.

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

[0005] A first heat exchange assembly includes a first heat exchange pipeline and a fin group sleeved on the outer periphery of the first heat exchange pipeline; and

[0006] The second heat exchange component is located on one side of the first heat exchange component. The second heat exchange component includes a second heat exchange pipeline connected to the first heat exchange pipeline. At least part of the pipe section of the second heat exchange pipeline adopts a corrugated pipe.

[0007] In one embodiment, the first heat exchange pipeline includes a plurality of first heat exchange tubes interconnected, each of the first heat exchange tubes extends along a first direction, and the plurality of first heat exchange tubes are arranged at intervals along a second direction. The fin group includes a plurality of fins arranged along the first direction, and each of the fins is provided with through holes for respectively inserting the plurality of first heat exchange tubes. The first direction and the second direction intersect.

[0008] In one embodiment, the second heat exchange component is located below the first heat exchange component and downstream of the first heat exchange component in the direction of flue gas flow. The heat exchanger has a water inlet and a water outlet. The water inlet 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, and the water outlet end of the first heat exchange pipeline is connected to the water outlet.

[0009] In one embodiment, the second heat exchange pipeline includes a plurality of second heat exchange tubes interconnected with each other, each of the second heat exchange tubes extends along the first direction, and the plurality of second heat exchange tubes are arranged to form at least one heat exchange layer. The plurality of second heat exchange tubes located in the same heat exchange layer are arranged at intervals along the second direction, and at least some of the second heat exchange tubes are corrugated tubes; the first direction, the second direction, and the flue gas flow direction intersect each other.

[0010] In one embodiment, a plurality of the second heat exchange tubes are arranged in the flue gas flow direction to form at least two heat exchange layers.

[0011] In one embodiment, the second heat exchange tubes of two adjacent heat exchange layers are staggered;

[0012] And / or, the second heat exchange component further includes a connecting piece, and the second heat exchange tubes of two adjacent heat exchange layers are connected via the connecting piece.

[0013] In one embodiment, the heat exchange layer includes a first heat exchange layer and a second heat exchange layer arranged at intervals in the direction of flow of the smoke;

[0014] The second heat exchange tubes of the first heat exchange layer and the second heat exchange tubes of the second heat exchange layer are alternately connected, so that the second heat exchange pipeline is a spiral coil structure that is spirally coiled and extends along the first direction;

[0015] Alternatively, the multiple second heat exchange tubes of the first heat exchange layer are connected in series to form a first serpentine pipeline, the multiple second heat exchange tubes of the second heat exchange layer are connected in series to form a second serpentine pipeline, and the first serpentine pipeline and the second serpentine pipeline are connected in series to form the second heat exchange pipeline.

[0016] 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.

[0017] In one embodiment, the heat exchanger further includes a water inlet pipe, a water outlet pipe, and two end plates that are opposite to and spaced apart from each other, the first heat exchange pipeline and the second heat exchange pipeline are both supported by the two end plates, and the water inlet pipe, the second heat exchange pipeline, the first heat exchange pipeline, and the water outlet pipe are connected in sequence.

[0018] 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.

[0019] The utility model also provides a water heater, comprising:

[0020] A heat exchanger as described above; and

[0021] A burner is located on a side of the first heat exchange component facing away from the second heat exchange component.

[0022] 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. At least part of the pipe section of the second heat exchange pipeline adopts a corrugated tube. The folds on the surface of the corrugated tube can increase the heat exchange area, so as to improve the heat exchange efficiency as much as possible in a limited space. 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

[0023] 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.

[0024] Figure 1 A schematic structural diagram of an embodiment of a heat exchanger provided by the utility model;

[0025] Figure 2 for Figure 1 The main view of the heat exchanger;

[0026] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure of the heat exchanger;

[0027] Figure 4 for Figure 1 Schematic diagram of the exploded structure of the heat exchanger.

[0028] Description of Figure Numbers:

[0029] 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; 21, second heat exchange pipeline; 211, second heat exchange tube; 20a, first heat exchange layer; 20b, second heat exchange layer; 22, connector; 30, water inlet pipe; 31, water inlet; 40, water outlet pipe; 41, water outlet; 42, lifting section; 50, end plate; 51, first mounting hole; 52, second mounting hole; 53, positioning hole; 60, bypass pipe.

[0030] 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

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] Based on this, the utility model proposes a heat exchanger 100, which can simplify the structure of the heat exchanger, reduce the volume, and improve the heat exchange efficiency while realizing two-stage heat exchange.

[0036] See also Figure 1 , Figure 2 and Figure 4 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, the second heat exchange component 20 includes a second heat exchange pipeline 21 connected to the first heat exchange pipeline 11, and at least part of the pipe section of the second heat exchange pipeline 21 adopts a corrugated pipe.

[0037] The heat exchanger 100 includes a first heat exchange component 10 and a second heat exchange component 20, and the second heat exchange component 20 is located on one side of the first heat exchange component 10 in the direction of flue gas flow. 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 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 direction of flue gas flow; 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, the second heat exchange component 20 can be used as the condensation heat exchange component, and 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. For example, in other application scenarios, the burner of the water heater can also be arranged on the side of the second heat exchange component 20 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 a condensing heat exchange component.

[0038] Among them, the first heat exchange component 10 adopts a tube-fin heat exchange structure, and 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, and there is a small gap between two adjacent fins 121 for flue gas to pass through, so that the contact area with 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; at least part of the pipe section of the second heat exchange pipeline 21 adopts a corrugated pipe, and the surface of the corrugated pipe has some fold structures and is corrugated, which can increase the heat exchange area and improve the heat exchange efficiency.

[0039] It is worth noting that at least part of the pipe sections of the second heat exchange pipeline 21 adopts a corrugated tube. For example, part of the pipe sections of the second heat exchange pipeline 21 can adopt a corrugated tube, and the other part of the pipe sections can adopt a smooth tube. For another example, all the pipe sections of the second heat exchange pipeline 21 can adopt a corrugated tube. For another example, the middle pipe section of the second heat exchange pipeline 21 can adopt a corrugated tube, and both ends of the second heat exchange pipeline 21 can adopt a smooth tube.

[0040] The technical solution of the utility model integrates the first heat exchange component 10 and the second heat exchange component 20 into 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 can be used as the condensing heat exchange component. The integrated heat exchanger 100 realizes two-stage heat exchange, so that the overall structure of the heat exchanger 100 is simpler and more compact, which is conducive to reducing the volume; and the first 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, which has a higher heat exchange efficiency; the second heat exchange component 20 is a simpler tube heat exchange structure formed by the second heat exchange pipeline 21, which occupies less space, and at least part of the pipe section of the second heat exchange pipeline 21 adopts a corrugated tube, and the folds on the surface of the corrugated tube can increase the heat exchange area, so as to improve the heat exchange efficiency as much as possible in a limited space. 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.

[0041] like Figures 2 to 4 As shown, in one embodiment, the first heat exchange pipeline 11 includes a plurality of first heat exchange tubes 111 interconnected, each of the first heat exchange tubes 111 extends along a first direction, and the plurality of first heat exchange tubes 111 are arranged at intervals along a second direction, and the fin group 12 includes a plurality of fins 121 arranged along the first direction, and each of the fins 121 is provided with through holes for respectively inserting the plurality of first heat exchange tubes 111; the first direction and the second direction intersect.

[0042] 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. A plurality of first heat exchange tubes 111 may be arranged in one layer, two layers or more in the direction of flue gas flow. Optionally, a plurality of first heat exchange tubes 111 may be arranged at intervals to form a single-layer structure, and a plurality of first heat exchange tubes 111 may be connected in series through a connecting elbow 112 to form a first heat exchange pipeline 11 arranged in a circuitous extension. 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 matches 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 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.

[0043] In the related art, a large amount of condensed water will be generated on the surface of the condensing heat exchanger. When the condensing heat exchanger adopts a tube-fin heat exchange structure, the condensed water can easily accumulate in the gap between two adjacent fins and cannot be discharged smoothly. This will cause condensed water blockage, and the flue gas cannot contact the surface of the heat exchange pipeline, thus affecting the heat exchange efficiency.

[0044] To avoid condensation blockage, Figure 1 and Figure 4 As shown, in one embodiment, the second heat exchange component 20 is located below the first heat exchange component 10 and downstream of the first heat exchange component 10 in the flue gas flow direction, and the heat exchanger 100 has a water inlet 31 and a water outlet 41, the water inlet 31 is connected to the water inlet end of the 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 water outlet end of the first heat exchange pipeline 11 is connected to the water outlet 41.

[0045] 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, the flue gas generated by the combustion of the burner flows from top to bottom, and sequentially passes through the first heat exchange component 10 and the second heat exchange component 20 for heat exchange, and the water flows along the path of the water inlet 31, the second heat exchange pipeline 21, the first heat exchange pipeline 11 and then to the water outlet 41. 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 to exchange heat with the upstream high-temperature flue gas, and then hot water is output from the water outlet 41. 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 condensing heat exchange component. The flue gas temperature after heat exchange 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 tube-fin heat exchange structure, and there will be no problem of condensed water accumulating in the gap between the fins 121 and causing condensed water blockage. The flue gas after heat exchange with the first heat exchange component 10 flows to the second heat exchange component 20. When the low-temperature flue gas in this section is cooled, condensation heat exchange will occur. The second heat exchange component 20 adopts a tubular heat exchange structure. 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; at least part of the pipe section of the second heat exchange pipeline 21 adopts a corrugated tube, and the surface of the corrugated tube has some pleated structures to increase the heat exchange area. The height of the pleats of the corrugated tube is much smaller than the height of the fins 121, so the condensed water is not easy to accumulate in the pleated gap of the corrugated tube; and 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 fin gap 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.

[0046] Of course, in some embodiments, when the flue gas flows 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 avoid the condensed water dripping directly onto the surface of the first heat exchange component 10.

[0047] The following description is mainly based on an example in which the flue gas flows from top to bottom and the second heat exchange component 20 is located below the first heat exchange component 10 .

[0048] like Figure 3 and Figure 4As shown, in one embodiment, the second heat exchange pipeline 21 includes a plurality of second heat exchange tubes 211 interconnected with each other, each of the second heat exchange tubes 211 extends along the first direction, and the plurality of second heat exchange tubes 211 are arranged to form at least one heat exchange layer, and the plurality of second heat exchange tubes 211 located in the same heat exchange layer are arranged at intervals along the second direction, and at least some of the second heat exchange tubes 211 are corrugated tubes; the first direction, the second direction, and the flue gas flow direction intersect each other.

[0049] In this embodiment, a plurality of second heat exchange tubes 211 may be connected in parallel or in series to form a second heat exchange pipeline 21. A plurality of second heat exchange tubes 211 may be arranged in one, two or more layers in the direction of flue gas flow, and a plurality of second heat exchange tubes 211 in each layer may be combined to form a heat exchange layer. At least part of the second heat exchange tubes 211 are corrugated tubes. For example, among the plurality of second heat exchange tubes 211 in the same heat exchange layer, a portion of the second heat exchange tubes 211 may be corrugated tubes, and another portion of the second heat exchange tubes 211 may be plain tubes; or a plurality of second heat exchange tubes 211 in the same heat exchange layer may all be corrugated tubes. For another example, for different heat exchange layers, a portion of the second heat exchange tubes 211 in the heat exchange layer may be corrugated tubes, and another portion of the second heat exchange tubes 211 in the heat exchange layer may be plain tubes. In order to simplify the structure of the second heat exchange pipeline 21 and reduce the difficulty of manufacturing, optionally, each second heat exchange tube 211 may be a corrugated tube. During manufacturing, a long corrugated tube may be bent multiple times to form a plurality of second heat exchange tubes 211 connected in series.

[0050] In order to further increase the heat exchange area of ​​the second heat exchange assembly 20 and improve the heat exchange efficiency, a plurality of the second heat exchange tubes 211 are arranged in the direction of the flue gas flow to form at least two layers of the heat exchange layer. In this way, the flue gas can pass through multiple heat exchange layers for heat exchange during the flow process, so that the vaporization latent heat of the flue gas can be more fully utilized, thereby improving the heat exchange efficiency. For example, Figure 3 As shown, multiple second heat exchange tubes 211 are arranged in the direction of flue gas flow to form two heat exchange layers, namely the first heat exchange layer 20a and the second heat exchange layer 20b. The first heat exchange layer 20a is located above the second heat exchange layer 20b. After the high-temperature flue gas exchanges heat with the top first heat exchange component 10, it passes through the first heat exchange layer 20a and the second heat exchange layer 20b in turn for heat exchange.

[0051] Alternatively, if Figure 3As shown, the second heat exchange tubes 211 of the two adjacent heat exchange layers are arranged in a staggered manner. For example, the second heat exchange tubes 211 of the first heat exchange layer 20a are opposite to the gap between the 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 tubes 211 of each heat exchange layer during the flow process to exchange heat, so as to improve the heat exchange efficiency; in addition, the condensed water generated on the surface of the second heat exchange tubes 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, ensuring that the condensed water can be discharged smoothly.

[0052] In one embodiment, if Figure 2 As shown, the second heat exchange assembly 20 also includes a connector 22, and the second heat exchange tubes 211 of the two adjacent heat exchange layers are connected by the connector 22. The second heat exchange tubes 211 of the upper and lower layers are connected by the connector 22, so that the overall structure of the second heat exchange assembly 20 is strengthened. In particular, when the second heat exchange tube 211 is made of a material with lower strength, the second heat exchange tube 211 is prone to deformation when the tube is filled with water. The connector 22 can provide structural support for the second heat exchange tube 211 to prevent deformation. For example, the connector 22 may include a connecting rod and hooks provided at both ends of the connecting rod. The connector 22 can hook the upper and lower second heat exchange tubes 211 respectively through the hooks at both ends of the connecting rod.

[0053] like Figure 3 and Figure 4 As shown, in one embodiment, the heat exchange layer includes a first heat exchange layer 20a and a second heat exchange layer 20b arranged at intervals in the direction of smoke flow; 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 alternately connected, so that the second heat exchange pipeline 21 is a spiral coil structure that is spirally coiled and extends along the first direction.

[0054] In this embodiment, 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 from 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 is a spiral coil structure that is spirally coiled and extends along the first direction. Among them, the water inlet and water outlet of the second heat exchange pipeline 21 can be located in the same heat exchange layer, or they can be located in different heat exchange layers. In practical applications, in order to simplify the manufacturing process, the second heat exchange pipeline 21 can be formed by a single tube integral bend. Due to the limitation of the bending process, there will be a large distance between the two ends of the bending section of the second heat exchange pipeline 21. The above-mentioned winding method is adopted so that the two ends of the bending section of the second heat exchange pipeline 21 are arranged up and down, so that a large distance can be formed between the upper and lower heat exchange layers, which is conducive to the flow of flue gas between the upper and lower heat exchange layers. At the same time, the distance between two adjacent second heat exchange tubes 211 of the same heat exchange layer can be relatively small, so that more second heat exchange tubes 211 can be arranged as much as possible when the area of ​​the heat exchange layer remains unchanged, thereby improving the heat exchange efficiency of the heat exchange layer, and then improving the overall heat exchange efficiency of the heat exchanger 100. Of course, in some other embodiments, the second heat exchange pipeline 21 may also include multiple independent second heat exchange tubes 211, and the multiple second heat exchange tubes 211 are connected by bending pipes.

[0055] In one embodiment, the heat exchange layer includes a first heat exchange layer 20a and a second heat exchange layer 20b arranged at intervals in the direction of the flue gas flow, a plurality of second heat exchange tubes 211 of the first heat exchange layer 20a are connected in series in sequence to form a first serpentine pipeline, a plurality of second heat exchange tubes 211 of the second heat exchange layer 20b are connected in series in sequence to form a second serpentine pipeline, and the first serpentine pipeline and the second serpentine pipeline are connected in series to form the second heat exchange pipeline 21.

[0056] In this embodiment, the second heat exchange pipeline 21 can be formed by bending a single tube. For example, when bending the tube, the first serpentine pipeline can be firstly wound on the first heat exchange layer 20a, and then bent to the second heat exchange layer 20b to wind the second serpentine pipeline. By adopting this winding process, more heat exchange layers can be wound more conveniently. For example, the third heat exchange layer, the fourth heat exchange layer, etc. can be further wound under the second heat exchange layer 20b according to the above winding method. Of course, in other embodiments, the first serpentine pipeline and the second serpentine pipeline can be separately wound using independent heat exchange tubes and then welded or assembled.

[0057] In the above embodiment, the number of the second heat exchange tubes 211 of the first heat exchange layer 20a and the number of the second heat exchange tubes 211 of the second heat exchange layer 20b may be the same or different. For example, when the number of the second heat exchange tubes 211 of 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 parallel to the flue gas flow direction may present a parallelogram structure as a whole; for another example, when the number of the second heat exchange tubes 211 of 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 parallel to the flue gas flow direction may present a trapezoidal structure as a whole. For example, Figure 3 As shown, the number of the second heat exchange tubes 211 of the first heat exchange layer 20a is greater than the number of the second heat exchange tubes 211 of the second heat exchange layer 20b. For example, the first heat exchange layer 20a has 6 second heat exchange tubes 211, the second heat exchange layer 20b has 5 second heat exchange tubes 211, and the second heat exchange tubes 211 of the first heat exchange layer 20a and the second heat exchange tubes 211 of the second heat exchange layer 20b are staggered, so that the cross section of the second heat exchange pipeline 21 parallel to the flue gas flow direction presents an inverted trapezoidal structure that is wide at the top and narrow at the bottom. When applied to a water heater, the heat exchanger 100 is disposed in the flue of the water heater, and the flue can be designed as a funnel-shaped structure that matches the inverted trapezoidal structure of the heat exchanger 100, so that the flue gas is more evenly distributed.

[0058] In one embodiment, the first heat exchange pipeline 11 is made of copper tubes, and the second heat exchange pipeline 21 is made of stainless steel tubes. In this way, the first 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, thereby making full use of the sensible heat energy of the flue gas. The second 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 pipeline 21. Of course, in some embodiments, the first heat exchange pipeline 11 and the second heat exchange pipeline 21 can also both use copper tubes, and the outer surface of the second heat exchange pipeline 21 is provided with an anti-corrosion layer. In addition, in order to simplify the manufacturing process, optionally, the first heat exchange pipeline 11 and the second heat exchange pipeline 21 are fixed by welding.

[0059] Based on the above embodiments, Figure 1 and Figure 4 As shown, in one embodiment, the heat exchanger 100 further includes a water inlet pipe 30, a water outlet pipe 40, and two end plates 50 that are oppositely and spaced apart, the first heat exchange pipeline 11 and the second heat exchange pipeline 21 are both supported by the two end plates 50, the water inlet end of the water inlet pipe 30 is provided with the water inlet port 31, and the water inlet pipe 30, the second heat exchange pipeline 21, the first heat exchange pipeline 11, and the water outlet pipe 40 are sequentially connected.

[0060] In this embodiment, the first heat exchange pipeline 11 and the second heat exchange pipeline 21 can be supported and fixed at the same time by two end plates 50, which is helpful to simplify the structure of the heat exchanger 100, save materials, reduce costs, and reduce the volume of the heat exchanger 100. Figure 4 As shown, the first heat exchange pipeline 11 may include a plurality of first heat exchange tubes 111 arranged side by side, and the two end plates 50 are respectively provided with first mounting holes 51 for the two ends of the first heat exchange tubes 111 to pass through. During assembly, the two ends of the plurality of first heat exchange tubes 111 are supported and positioned by the two end plates 50, and then the two adjacent first heat exchange tubes 111 are connected through the connecting elbow 112. One of the end plates 50 is provided with a second mounting hole 52 for the end of the second heat exchange pipeline 21 to pass through. For example, the end plate 50 on the side close to the water inlet pipe 30 is provided with a second mounting hole 52. During assembly, the water inlet end of the second heat exchange pipeline 21 is passed through the second mounting hole 52 to be connected to the water inlet pipe 30. Optionally, the end plate 50 on the side close to the water outlet end of the first heat exchange pipeline 11 is provided with a positioning hole 53, and the water outlet end of the second heat exchange pipeline 21 can pass through the positioning hole 53 to be connected to the first heat exchange pipeline 11. Optionally, the positioning hole 53 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 .

[0061] When the heat exchanger 100 is working, the external cold water is transported from the water inlet pipe 30 to the second heat exchange pipeline 21 to perform latent heat exchange with the flue gas, and then flows to the first heat exchange pipeline 11 to perform sensible heat exchange with the flue gas. The heated hot water is output from the water outlet pipe 40 to provide hot water for the user. When the flue gas flows from top to bottom, the first heat exchange pipeline 11 is located above the second heat exchange pipeline 21.

[0062] 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 40 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.

[0063] In order to reduce the evaporation noise of the water heater, Figure 1As shown, in one embodiment, the first heat exchange pipeline 11 is located above the second heat exchange pipeline 21, and the outlet pipe 40 includes a lifting section 42, and the lowest height of the lifting section 42 in the pipe 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 40, it will pass through the lifting section 42. When the water level reaches the lifting section 42, since the lowest point of the lifting section 42 is not less than the highest point of the first heat exchange pipeline 11, when the lifting section 42 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 inflowed 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 quiet effect of the heat exchanger 100 when in use.

[0064] like Figure 1 As shown, in one embodiment, the heat exchanger 100 further includes a bypass pipe 60, and the bypass pipe 60 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 60 for mixing, thereby reducing 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 60 is connected to the connecting pipe, and the other end is connected to the water outlet pipe 40.

[0065] 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 first heat exchange component 10 away from the second 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.

[0066] In this embodiment, the burner may be located below the heat exchanger 100, and the second heat exchange component 20 of the heat exchanger 100 is located above the first heat exchange component 10, and the flue gas generated by the burner combustion flows from bottom to top, and sequentially passes through the first heat exchange component 10 and the second heat exchange component 20 for heat exchange. Alternatively, the burner may be located above the heat exchanger 100, and the first heat exchange component 10 of the heat exchanger 100 is located above the second heat exchange component 20, and the flue gas generated by the burner combustion flows from top to bottom, and sequentially passes through the first heat exchange component 10 and the second heat exchange component 20 for heat exchange.

[0067] 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 first heat exchange component comprises a first heat exchange pipeline and a fin group sleeved on the outer 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 includes a second heat exchange pipeline connected to the first heat exchange pipeline. At least part of the pipe section of the second heat exchange pipeline adopts a corrugated pipe.

2. The heat exchanger according to claim 1, characterized in that The first heat exchange pipeline includes a plurality of first heat exchange tubes interconnected with each other, each of the first heat exchange tubes extends along a first direction, and the plurality of first heat exchange tubes are arranged at intervals along a second direction. The fin group includes a plurality of fins arranged along the first direction, and each of the fins is provided with through holes for respectively inserting the plurality of first heat exchange tubes. The first direction and the second direction intersect.

3. 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 direction of flue gas flow. The heat exchanger has a water inlet and a water outlet. The water inlet 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, and the water outlet end of the first heat exchange pipeline is connected to the water outlet.

4. The heat exchanger according to claim 3, characterized in that The second heat exchange pipeline includes a plurality of second heat exchange tubes interconnected with each other, each of the second heat exchange tubes extending along the first direction, and the plurality of second heat exchange tubes are arranged to form at least one heat exchange layer. The plurality of second heat exchange tubes located in the same heat exchange layer are arranged at intervals along the second direction, and at least some of the second heat exchange tubes are corrugated tubes; the first direction, the second direction, and the flue gas flow direction intersect each other.

5. The heat exchanger according to claim 4, characterized in that A plurality of the second heat exchange tubes are arranged in the flue gas flow direction to form at least two heat exchange layers.

6. The heat exchanger according to claim 5, characterized in that The second heat exchange tubes of two adjacent heat exchange layers are staggered; And / or, the second heat exchange component further includes a connecting piece, and the second heat exchange tubes of two adjacent heat exchange layers are connected via the connecting piece.

7. The heat exchanger according to claim 5, characterized in that The heat exchange layer comprises a first heat exchange layer and a second heat exchange layer arranged at intervals in the direction of the flue gas flow; The second heat exchange tubes of the first heat exchange layer and the second heat exchange tubes of the second heat exchange layer are alternately connected, so that the second heat exchange pipeline is a spiral coil structure that is spirally coiled and extends along the first direction; Alternatively, the multiple second heat exchange tubes of the first heat exchange layer are connected in series to form a first serpentine pipeline, the multiple second heat exchange tubes of the second heat exchange layer are connected in series to form a second serpentine pipeline, and the first serpentine pipeline and the second serpentine pipeline are connected in series to form the second heat exchange pipeline.

8. 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.

9. The heat exchanger according to any one of claims 1 to 8, characterized in that: The heat exchanger also includes a water inlet pipe, a water outlet pipe, and two end plates that are opposite and spaced apart. The first heat exchange pipeline and the second heat exchange pipeline are both supported by the two end plates. The water inlet pipe, the second heat exchange pipeline, the first heat exchange pipeline, and the water outlet pipe are connected in sequence.

10. The heat exchanger according to claim 9, characterized in that The heat exchanger further includes a bypass pipe, which connects the second heat exchange pipeline with the water outlet pipe.

11. A water heater, characterized in that: include: The heat exchanger according to any one of claims 1 to 10; 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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