Heat exchanger and water heater

Abstract

The utility model discloses a heat exchanger and a water heater, and relates to the technical field of heat exchange, the heat exchanger comprises: a main heat exchange assembly comprising a first heat exchange pipeline; the condensation heat exchange assembly comprises a second heat exchange pipeline, the second heat exchange pipeline forms a first heat exchange layer and a second heat exchange layer, the main heat exchange assembly, the first heat exchange layer and the second heat exchange layer are sequentially arranged in the first direction, and the second heat exchange pipeline is provided with a water inlet part and a water outlet part. And the water inlet part, the second heat exchange layer, the first heat exchange layer, the water outlet part and the first heat exchange pipeline are sequentially communicated in series. 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 condensation 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 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 is complex in structure and large in size. 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. 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 condensation heat exchange efficiency.

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

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

[0006] A condensing heat exchange component, wherein the condensing heat exchange component includes a second heat exchange pipeline, wherein the second heat exchange pipeline constructs a first heat exchange layer and a second heat exchange layer, wherein the main heat exchange component, the first heat exchange layer and the second heat exchange layer are arranged sequentially in a first direction, wherein the second heat exchange pipeline has a water inlet and a water outlet, wherein the water inlet, the second heat exchange layer, the first heat exchange layer, the water outlet and the first heat exchange pipeline are sequentially connected in series.

[0007] In one embodiment, the second heat exchange pipeline includes a plurality of second heat exchange tubes, the first heat exchange layer and the second heat exchange layer are respectively arranged with the second heat exchange tubes, the plurality of second heat exchange tubes in the same heat exchange layer are arranged at intervals along the second direction, the number of second heat exchange tubes in the first heat exchange layer is greater than the number of second heat exchange tubes in the second heat exchange layer, the outermost edge of the second heat exchange layer in the second direction does not exceed the outermost edge of the first heat exchange layer, the water inlet and the water outlet are both located in the second heat exchange layer, and the first direction intersects with the second direction.

[0008] In one embodiment, the second heat exchange tubes of the first heat exchange layer and the second heat exchange tubes of the second heat exchange layer are staggered.

[0009] In one embodiment, a plurality of second heat exchange tubes in the first heat exchange layer are connected in series to form a first serpentine pipeline, and a plurality of second heat exchange tubes in the second heat exchange layer are connected in series to form a second serpentine pipeline, the water inlet end of the second serpentine pipeline is connected to the water inlet part, the water outlet end of the second serpentine pipeline is connected to the water inlet end of the first serpentine pipeline, and the water outlet end of the first serpentine pipeline is bent to the second heat exchange layer and connected to the water outlet part.

[0010] In one embodiment, the second heat exchange pipeline is formed by integrally winding a single pipe.

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

[0012] In one embodiment, the first heat exchange pipeline includes a plurality of first heat exchange tubes arranged side by side, and the main heat exchange assembly further includes a fin group sleeved on the outer periphery of the plurality of first heat exchange tubes.

[0013] 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.

[0014] In one embodiment, the heat exchanger further includes an inlet pipe, an outlet pipe and a bypass pipe, the inlet pipe is connected to the water inlet part, 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.

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

[0016] A heat exchanger as described above; and

[0017] The burner is located on a side of the main heat exchange component away from the condensing heat exchange component.

[0018] 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; the second heat exchange pipeline of the condensing heat exchange component constructs the first heat exchange layer and the second heat exchange layer. In actual application, the burner of the water heater can be arranged on the side of the main heat exchange component away from the condensing heat exchange component, and the high-temperature flue gas generated by the burner combustion can pass through the main heat exchange component, the first heat exchange layer and the second heat exchange layer in sequence for heat exchange; the water inlet, the second heat exchange layer, the first heat exchange layer, the water outlet and the first heat exchange pipeline are connected in series in sequence, so that external cold water can be first transported to the second heat exchange layer through the water inlet, then to the first heat exchange layer, and finally transported to the first heat exchange pipeline by the water outlet. In this way, even if the temperature of the flue gas in contact with the second heat exchange layer is relatively low, the water temperature inside the second heat exchange layer is also relatively low, so that a large temperature difference can still be maintained between the low-temperature flue gas and the low-temperature water in the second heat exchange layer to achieve effective heat exchange, thereby ensuring that the latent heat of the low-temperature flue gas can be fully utilized, thereby improving the condensation heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

[0020] Figure 1 A schematic structural diagram of an embodiment of a heat exchanger provided by the utility model;

[0021] Figure 2 for Figure 1 The main view of the heat exchanger (some fins are omitted);

[0022] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure of the heat exchanger;

[0023] Figure 4 for Figure 1 Schematic diagram of the structure of the second heat exchange pipeline of the middle heat exchanger.

[0024] Description of Figure Numbers:

[0025] 100, heat exchanger; 10, main heat exchange component; 11, first heat exchange pipeline; 111, first heat exchange tube; 12, fin group; 121, fin; 20, condensing heat exchange component; 20a, first heat exchange layer; 20b, second heat exchange layer; 21, second heat exchange pipeline; 211, water inlet; 212, water outlet; 213, second heat exchange tube; 30, water inlet pipe; 40, water outlet pipe; 50, bypass pipe; 60, end plate; 70, connecting pipe.

[0026] 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

[0027] 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.

[0028] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0029] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0030] In the related art, some gas water heaters include a main heat exchanger and a condensing heat exchanger, which can realize two-stage heat exchange of main heat exchange and condensing heat exchange. However, the main heat exchanger and the condensing heat exchanger generally adopt a split design with complex structure and large volume. 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.

[0031] Based on this, the utility model proposes a heat exchanger 100, which realizes two-stage heat exchange through a simpler structure of the heat exchanger 100, and can make full use of the latent heat of low-temperature flue gas, thereby improving the condensation heat exchange efficiency.

[0032] See also Figures 1 to 3 In one embodiment of the utility model, the heat exchanger 100 includes a main heat exchange component 10 and a condensing heat exchange component 20. The main heat exchange component 10 includes a first heat exchange pipeline 11; the condensing heat exchange component 20 includes a second heat exchange pipeline 21, the second heat exchange pipeline 21 constructs a first heat exchange layer 20a and a second heat exchange layer 20b, the main heat exchange component 10, the first heat exchange layer 20a and the second heat exchange layer 20b are arranged in sequence in the first direction, the second heat exchange pipeline 21 has a water inlet 211 and a water outlet 212, the water inlet 211, the second heat exchange layer 20b, the first heat exchange layer 20a, the water outlet 212 and the first heat exchange pipeline 11 are connected in series in sequence.

[0033] The heat exchanger 100 includes a main heat exchange component 10 and a condensing heat exchange component 20. When applied to a water heater, the burner of the water heater can be arranged on a side of the main heat exchange component 10 away from the condensing heat exchange component 20, so that the condensing heat exchange component 20 is located downstream of the main heat exchange component 10 in the flue gas flow direction. In this way, the high-temperature flue gas generated by the burner combustion flows toward the heat exchanger 100, and 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 second heat exchange pipeline 21 introduces cold water through the water inlet part 211. For example, the water inlet part 211 can be connected to the water inlet pipe 30 of the heat exchanger 100. In this way, external cold water can be transported by the water inlet part 211 to the second heat exchange pipeline 21 for preheating, and the preheated water is then transported by the water outlet part 212 to the first heat exchange pipeline 11 for reheating and outputting hot water.

[0034] The second heat exchange pipeline 21 constructs a first heat exchange layer 20a and a second heat exchange layer 20b, and the main heat exchange component 10, the first heat exchange layer 20a and the second heat exchange layer 20b are arranged in sequence in the first direction. The first direction may be the height direction of the heat exchanger 100 (i.e., the up-down direction). The main heat exchange component 10, the first heat exchange layer 20a and the second heat exchange layer 20b may be arranged in sequence from top to bottom. Accordingly, when applied, the burner may be arranged above the main heat exchange component 10. During the process of flue gas flowing from top to bottom, the main heat exchange component 10, the first heat exchange layer 20a and the second heat exchange layer 20b may be sequentially exchanged. Alternatively, the main heat exchange component 10, the first heat exchange layer 20a and the second heat exchange layer 20b may be arranged in sequence from bottom to top. Accordingly, when applied, the burner may be arranged below the main heat exchange component 10. During the process of flue gas flowing from bottom to top, the main heat exchange component 10, the first heat exchange layer 20a and the second heat exchange layer 20b may be sequentially exchanged.

[0035] It can be understood that the water inlet 211, the second heat exchange layer 20b, the first heat exchange layer 20a, the water outlet 212 and the first heat exchange pipeline 11 are connected in series in sequence, so that the external cold water can be first transported to the second heat exchange layer 20b through the water inlet 211, then transported to the first heat exchange layer 20a, and finally transported to the second heat exchange pipeline 21 by the water outlet 212. In this way, the water temperature in the second heat exchange layer 20b is lower than that in the first heat exchange layer 20a. After the high-temperature flue gas exchanges heat with the main heat exchange component 10, it passes through the first heat exchange layer 20a and the second heat exchange layer 20b in sequence, that is, the flue gas temperature in contact with the first heat exchange layer 20a is higher, and the flue gas temperature in contact with the second heat exchange layer 20b is relatively low. In this way, although the temperature of the flue gas in contact with the second heat exchange layer 20b is relatively low, the water temperature inside the second heat exchange layer 20b is also relatively low, so that a large temperature difference can still be maintained between the low-temperature flue gas and the low-temperature water in the second heat exchange layer 20b to achieve effective heat exchange, thereby ensuring that the latent heat of the low-temperature flue gas can also be fully utilized, thereby improving the condensation heat exchange efficiency.

[0036] The technical solution of the utility model integrates the main heat exchange component 10 and the condensing heat exchange component 20 into a heat exchanger 100, and realizes two-stage heat exchange through the integrated heat exchanger 100, so that the overall structure of the heat exchanger 100 is simpler and more compact, which is conducive to reducing the volume; the second heat exchange pipeline 21 of the condensing heat exchange component 20 constructs the first heat exchange layer 20a and the second heat exchange layer 20b. In actual application, the burner of the water heater can be arranged in the main heat exchange component 10 away from the condensing heat exchange component 20 On one side, the high-temperature flue gas generated by the burner combustion can sequentially pass through the main heat exchange component 10, the first heat exchange layer 20a and the second heat exchange layer 20b for heat exchange; the water inlet 211, the second heat exchange layer 20b, the first heat exchange layer 20a, the water outlet 212 and the first heat exchange pipeline 11 are sequentially connected in series, so that the external cold water can be first transported to the second heat exchange layer 20b through the water inlet 211, then transported to the first heat exchange layer 20a, and finally transported to the first heat exchange pipeline 11 by the water outlet 212. In this way, even if the temperature of the flue gas in contact with the second heat exchange layer 20b is relatively low, the water temperature inside the second heat exchange layer 20b is also relatively low, so that a large temperature difference can still be maintained between the low-temperature flue gas and the low-temperature water in the second heat exchange layer 20b to achieve effective heat exchange, thereby ensuring that the latent heat of the low-temperature flue gas can also be fully utilized, thereby improving the condensation heat exchange efficiency.

[0037] like Figure 3 and Figure 4 As shown, in one embodiment, the second heat exchange pipeline 21 includes a plurality of second heat exchange tubes 213, the first heat exchange layer 20a and the second heat exchange layer 20b are respectively arranged with the second heat exchange tubes 213, and the plurality of second heat exchange tubes 213 in the same heat exchange layer are arranged at intervals along the second direction, the number of the second heat exchange tubes 213 in the first heat exchange layer 20a is greater than the number of the second heat exchange tubes 213 in the second heat exchange layer 20b, and the outermost edge of the second heat exchange layer 20b in the second direction does not exceed the outermost edge of the first heat exchange layer 20a, the water inlet 211 and the water outlet 212 are both located in the second heat exchange layer 20b, and the first direction intersects with the second direction.

[0038] In this embodiment, the second direction may be the width direction of the heat exchanger 100, and each heat exchange layer has a plurality of second heat exchange tubes 213 arranged side by side and spaced apart, and the second heat exchange tubes 213 may be extended along the third direction. The distance between the outer edges of the two outermost second heat exchange tubes 213 located in the same heat exchange layer in the second direction is the width dimension of the heat exchange layer. The number of second heat exchange tubes 213 in the first heat exchange layer 20a is greater than the number of second heat exchange tubes 213 in the second heat exchange layer 20b, so that the width dimension of the first heat exchange layer 20a is greater than the width dimension of the second heat exchange layer 20b. For example, Figure 3As shown, the first heat exchange layer 20a includes four second heat exchange tubes 213 arranged side by side, and the second heat exchange layer 20b includes three second heat exchange tubes 213 arranged side by side. Of course, the number of second heat exchange tubes 213 in the first heat exchange layer 20a and the second heat exchange layer 20b is not limited thereto and can be set according to actual needs. Taking the example of the first heat exchange layer 20a being located above the second heat exchange layer 20b, the outermost edge of the second heat exchange layer 20b in the second direction does not exceed the outermost edge of the first heat exchange layer 20a, that is, the projection of the first heat exchange layer 20a toward the second heat exchange layer 20b can completely cover the second heat exchange layer 20b, so that the cross-section of the second heat exchange pipeline 21 parallel to the flue gas flow direction generally presents an inverted trapezoidal structure that is wide at the top and narrow at the bottom, and the two side edges of the inverted trapezoidal structure in the second direction gradually incline and approach each other from top to bottom, which is more conducive to guiding the flue gas from top to bottom toward the middle position of the second heat exchange layer 20b, so that each second heat exchange tube 213 of the second heat exchange layer 20b can fully contact and exchange heat with the flue gas, thereby further improving the condensation heat exchange efficiency.

[0039] Among them, the second heat exchange tube 213 can adopt a light tube, the surface of the light tube is smoother, which is conducive to the rapid dripping of condensed water and avoids condensed water blockage. Alternatively, the second heat exchange tube 213 can also adopt a corrugated tube. Compared with a light tube, the folds on the surface of the corrugated tube can increase the heat exchange area, so that when the length of the second heat exchange pipeline 21 is the same, the heat exchange efficiency can be improved. Alternatively, when the same heat exchange efficiency is achieved, the length of the second heat exchange pipeline 21 can be shortened to save materials and reduce costs. In addition, compared with the fin 121 tube, the depth of the folds on the surface of the corrugated tube is shallow, and it is not easy to accumulate condensed water, thereby avoiding condensed water blockage.

[0040] like Figure 3 As shown, in one embodiment, the second heat exchange tube 213 of the first heat exchange layer 20a and the second heat exchange tube 213 of the second heat exchange layer 20b are arranged in a staggered manner. For example, the second heat exchange tube 213 of the first heat exchange layer 20a can be opposite to the gap between two adjacent second heat exchange tubes 213 in the second heat exchange layer 20b, so that the projections of the second heat exchange tubes 213 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 with the surface of the second heat exchange tube 213 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 tube 213 of the upper heat exchange layer can also drip downward from the gap between the two adjacent second heat exchange tubes 213 of the lower heat exchange layer, ensuring that the condensed water can be discharged smoothly.

[0041] like Figure 4As shown, in one embodiment, the multiple second heat exchange tubes 213 in the first heat exchange layer 20a are connected in series to form a first serpentine pipeline, and the multiple second heat exchange tubes 213 in the second heat exchange layer 20b are connected in series to form a second serpentine pipeline, the water inlet end of the second serpentine pipeline is connected to the water inlet part 211, the water outlet end of the second serpentine pipeline is connected to the water inlet end of the first serpentine pipeline, and the water outlet end of the first serpentine pipeline is bent to the second heat exchange layer 20b and connected to the water outlet part 212.

[0042] In this embodiment, the second heat exchange pipeline 21 can be formed by winding a single pipe. For example, after winding a second serpentine pipeline in the second heat exchange layer 20b with the water inlet 211 as the starting end, it is extended to the first heat exchange layer 20a to wind a second serpentine pipeline, and then bent to the first heat exchange layer 20a and extended for a distance to form the water outlet 212. Of course, in other embodiments, the first serpentine pipeline and the second serpentine pipeline can also be formed separately and then welded or assembled.

[0043] Optionally, the second heat exchange pipeline 21 is formed by winding a single pipe in one piece, so that 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 multiple pipes, which can reduce the risk of water leakage.

[0044] In one embodiment, the first heat exchange pipeline 11 is made of copper pipes, and the second heat exchange pipeline 21 is made of stainless steel pipes. In this way, the first heat exchange pipeline 11 can make full use of the high thermal conductivity of copper to achieve sufficient heat exchange with the flue gas and improve the main heat exchange efficiency. The second heat exchange pipeline 21 is made of stainless steel pipes to prevent condensation water from blocking, and stainless steel has good corrosion resistance, which can prevent condensation water from corroding the surface of the second heat exchange pipeline 21.

[0045] like Figure 1 and Figure 2 As shown, in one embodiment, the first heat exchange pipeline 11 includes a plurality of first heat exchange tubes 111 arranged side by side, and the main heat exchange component 10 also includes a fin group 12 sleeved on the outer periphery of the plurality of first heat exchange tubes 111 .

[0046] In this embodiment, the main heat exchange component 10 adopts a tube-fin heat exchange structure, and a plurality of first heat exchange tubes 111 can be connected in series or in parallel to form a first heat exchange pipeline 11. The plurality of first heat exchange tubes 111 can be arranged in one layer, two layers or more in the first direction. Optionally, the plurality of first heat exchange tubes 111 are arranged at intervals to form a single-layer structure, and the plurality of first heat exchange tubes 111 can be connected in series through connecting bends to form a first heat exchange pipeline 11 that is arranged in a circuitous manner. A plurality of fins 121 are arranged along the first direction to form a fin group 12, and each fin 121 is provided with a plurality of perforations, wherein the number of perforations matches the number of the first heat exchange tubes 111. For example, as Figure 3 As shown, the first heat exchange pipeline 11 includes four first heat exchange tubes 111 arranged in a single row. Correspondingly, each fin 121 is provided with four perforations arranged in a single row. The first heat exchange tubes 111 are interlaced and matched with the perforations on the fins 121 in a one-to-one correspondence. Of course, the number of first heat exchange tubes 111 is not limited to four, for example, it can also be three, five or more. A gap for flue gas to pass through is formed between two adjacent fins 121. The high-temperature flue gas passes through the gap between the fins 121 along the incoming flow direction, sweeps across the surface of the fins 121, and realizes the heat transfer from the high-temperature flue gas to the fins 121, so as to realize the heating of the water in the first heat exchange tube 111, which can effectively improve the heat exchange efficiency.

[0047] Based on the above embodiments, Figure 2 As shown, in one embodiment, the condensing heat exchange component 20 is located below the main heat exchange component 10 and downstream of the main heat exchange component 10 in the flue gas flow direction.

[0048] In this embodiment, the condensing heat exchange component 20 is located below the main heat exchange component 10. When applied to a water heater, the burner of the water heater can be arranged above the main heat exchange component 10, so that the condensing heat exchange component 20 is located downstream of the main heat exchange component 10 in the flue gas flow direction. In this way, the high-temperature flue gas generated by the combustion of the burner flows from top to bottom, first passes through the main heat exchange component 10 for main heat exchange, and then passes through the condensing heat exchange component 20 for condensation heat exchange. The flue gas temperature after heat exchange with the main heat exchange component 10 is generally higher than the flue gas dew point temperature by a certain margin, and condensed water will not be generated on the surface of the main heat exchange component 10. Therefore, even if the main heat exchange component 10 adopts a tube-fin heat exchange structure, there will be no problem of condensed water accumulating in the gap between the fins 121 and causing condensed water blockage. The condensing heat exchange component 20 adopts a tubular heat exchange structure, and there are no fins 121 on the periphery of the second heat exchange pipeline 21, so that the condensed water generated on the surface of the second heat exchange pipeline 21 can drip quickly to avoid the accumulation of condensed water in the gaps between the fins 121 and the occurrence of condensed water blockage. The condensing heat exchange component 20 is located below the main heat exchange component 10. The condensed water generated on the surface of the condensing heat exchange component 20 can drip downward under the action of gravity, but will not drip onto the surface of the main heat exchange component 10 and affect the main heat exchange efficiency.

[0049] In order to facilitate the installation of the main heat exchange component 10 and the condensing heat exchange component 20, as shown in FIG. Figure 2 As shown, in one embodiment, the heat exchanger 100 includes two end plates 60 arranged relatively spaced apart, and the first heat exchange pipeline 11 and the second heat exchange pipeline 21 are both supported by the two end plates 60. In this way, the first heat exchange pipeline 11 and the second heat exchange pipeline 21 share two end plates 60 for installation and fixation, which is conducive to simplifying the structure of the heat exchanger 100, saving materials, reducing costs, and reducing the volume of the heat exchanger 100.

[0050] like Figure 1 and Figure 2 As shown, in one embodiment, the heat exchanger 100 also includes an inlet pipe 30, an outlet pipe 40 and a bypass pipe 50, the inlet pipe 30 is connected to the water inlet part 211, the outlet end of the first heat exchange pipeline 11 is connected to the outlet pipe 40, and the bypass pipe 50 connects the second heat exchange pipeline 21 with the outlet pipe 40.

[0051] In this embodiment, when the heat exchanger 100 is working, external cold water can be transported to the second heat exchange pipeline 21 through the water inlet pipe 30 for preheating, and then transported to the first heat exchange pipeline 11 through the water outlet 212 for further heating, and the heated hot water is output from the water outlet 40. And when the water outlet 40 outputs hot water, the water with a relatively low temperature in the second heat exchange pipeline 21 can flow to the water outlet 40 through the bypass pipe 50 for mixing, so as to reduce the water stop temperature rise of the heat exchanger 100. Optionally, the water outlet 212 of the second heat exchange pipeline 21 is connected to the first heat exchange pipeline 11 through the connecting pipe 70, one end of the bypass pipe 50 is connected to the connecting pipe 70, and the other end is connected to the water outlet 40, so that part of the water flow output from the second heat exchange pipeline 21 flows to the first heat exchange pipeline 11, and the other part flows to the water outlet 40 through the bypass pipe 50.

[0052] It is understandable that when the water pressure pumped into the heat exchange tube by the external water source is insufficient and the first heat exchange tube 11 is located at a relatively high position, the water in the first heat exchange tube 11 may flow out from the water outlet pipe 40 without filling the entire tube cavity. Since the water in the first heat exchange tube 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.

[0053] In order to reduce the vaporization noise of the water heater, in one embodiment, the water outlet pipe 40 includes a lifting section, and the lowest height in the pipe of the lifting section is not less than the highest height in the pipe of the first heat exchange pipeline 11. In this way, when the heat exchanger 100 flows out through the water outlet pipe 40, it will pass through the lifting section. When the water level reaches the lifting section, since the lowest point of the lifting section is not less than the highest point of the first heat exchange pipeline 11, when water can enter the lifting section, the water level in the first heat exchange pipeline 11 can reach its highest point. Even when a small amount of water enters 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.

[0054] The utility model also provides a water heater, which includes a heat exchanger 100 and a burner. 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. 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 repeated here.

[0055] In this embodiment, the high-temperature flue gas generated by the combustion of the burner can be sequentially passed through the main heat exchange component 10 and the condensing heat exchange component 20 for heat exchange. The water heater also has a fan for driving the airflow from the burner to the heat exchanger 100. For example, the fan, the burner and the heat exchanger 100 can be arranged sequentially from top to bottom. When the water heater is working, the fan can drive the airflow from the burner to the heat exchanger 100 from top to bottom, so that the high-temperature flue gas generated by the combustion of the burner flows from top to bottom, and sequentially passes through the main heat exchange component 10 and the condensing heat exchange component 20 of the heat exchanger 100 to achieve two-stage heat exchange. Alternatively, the fan, the burner and the heat exchanger 100 can also be arranged sequentially from bottom to top, and the fan drives the airflow from the burner to the heat exchanger 100 from bottom to top, so that the high-temperature flue gas generated by the combustion of the burner flows from bottom to top, and sequentially passes through the main heat exchange component 10 and the condensing heat exchange component 20 of the heat exchanger 100 to achieve two-stage heat exchange.

[0056] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A heat exchanger, characterized in that: include: A main heat exchange assembly, comprising a first heat exchange pipeline; as well as A condensing heat exchange component, wherein the condensing heat exchange component includes a second heat exchange pipeline, wherein the second heat exchange pipeline constructs a first heat exchange layer and a second heat exchange layer, wherein the main heat exchange component, the first heat exchange layer and the second heat exchange layer are arranged sequentially in a first direction, wherein the second heat exchange pipeline has a water inlet and a water outlet, wherein the water inlet, the second heat exchange layer, the first heat exchange layer, the water outlet and the first heat exchange pipeline are sequentially connected in series.

2. The heat exchanger according to claim 1, characterized in that The second heat exchange pipeline includes a plurality of second heat exchange tubes, and the first heat exchange layer and the second heat exchange layer are respectively arranged with the second heat exchange tubes, and the plurality of second heat exchange tubes in the same heat exchange layer are arranged at intervals along the second direction, the number of second heat exchange tubes in the first heat exchange layer is greater than the number of second heat exchange tubes in the second heat exchange layer, and the outermost edge of the second heat exchange layer in the second direction does not exceed the outermost edge of the first heat exchange layer, the water inlet and the water outlet are both located in the second heat exchange layer, and the first direction intersects with the second direction.

3. The heat exchanger according to claim 2, characterized in that The second heat exchange tubes of the first heat exchange layer and the second heat exchange tubes of the second heat exchange layer are staggered.

4. The heat exchanger according to claim 2, characterized in that The multiple second heat exchange tubes in the first heat exchange layer are connected in series to form a first serpentine pipeline, and the multiple second heat exchange tubes in the second heat exchange layer are connected in series to form a second serpentine pipeline. The water inlet end of the second serpentine pipeline is connected to the water inlet part, the water outlet end of the second serpentine pipeline is connected to the water inlet end of the first serpentine pipeline, and the water outlet end of the first serpentine pipeline is bent to the second heat exchange layer and connected to the water outlet part.

5. The heat exchanger according to claim 1, characterized in that The second heat exchange pipeline is formed by integrally winding a single pipe.

6. The heat exchanger according to claim 1, characterized in that The first heat exchange pipeline is made of copper pipe, and the second heat exchange pipeline is made of stainless steel pipe.

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

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

9. The heat exchanger according to claim 8, characterized in that The heat exchanger further includes a water inlet pipe, a water outlet pipe and a bypass pipe, the water inlet pipe is connected to the water inlet part, the water outlet end of the first heat exchange pipeline is connected to the water outlet pipe, and the bypass pipe connects the second heat exchange pipeline with the water outlet pipe.

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

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