Heat exchanger and water heater

Abstract

The utility model discloses a heat exchanger and a water heater, and relates to the technical field of heat exchange, the heat exchanger comprises: a main heat exchange assembly, which comprises a first heat exchange pipeline and a fin group sleeved on the periphery of the first heat exchange pipeline; the condensation heat exchange assembly is located on one side of the main heat exchange assembly and comprises a second heat exchange pipeline, the water inlet end of the second heat exchange pipeline communicates with a water inlet of the heat exchanger, and the water outlet end of the second heat exchange pipeline communicates with the water inlet end of the first heat exchange pipeline; and the water outlet end of the first heat exchange pipeline is communicated with the water outlet of the heat exchanger. According to the technical scheme, two-stage heat exchange is achieved through a simpler heat exchanger structure, the risk of condensate water blockage can be reduced, and efficient heat exchange is achieved.

Description

Technical Field

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

[0002] Under the background of energy conservation and emission reduction, improving the energy efficiency of gas water heaters has become a trend in the industry. To improve energy efficiency, it is necessary to utilize the latent heat of vaporization of flue gas and increase condensation heat transfer. In related technologies, some gas water heaters include a main heat exchanger and a condensation heat exchanger, which can achieve two-stage heat transfer of main heat transfer and condensation heat transfer. However, the main heat exchanger and the condensation heat exchanger generally adopt a split design, with a complex structure, large overall occupied space, and both the main heat exchanger and the condensation heat exchanger adopt a finned tube heat exchange structure, which will cause condensed water to easily accumulate in the fin gaps, resulting in condensed water blockage and affecting the heat transfer efficiency. Summary of the Utility Model

[0003] The main purpose of the utility model is to propose a heat exchanger and a water heater, aiming to achieve two-stage heat transfer through a simpler heat exchanger structure, reduce the risk of condensed water blockage, and achieve efficient heat transfer.

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

[0005] A main heat exchange component, including a first heat exchange pipeline and a fin group sleeved outside the first heat exchange pipeline; and

[0006] A condensation heat exchange component, located on one side of the main heat exchange component. The condensation heat exchange component includes a second heat exchange pipeline. The water inlet end of the second heat exchange pipeline is communicated with the water inlet of the heat exchanger, the water outlet end of the second heat exchange pipeline is communicated with the water inlet end of the first heat exchange pipeline, and the water outlet end of the first heat exchange pipeline is communicated with the water outlet of the heat exchanger.

[0007] In an embodiment, the condensation heat exchange component is located below the main heat exchange component;

[0008] And / or, the first heat exchange pipeline is made of copper pipe, and the second heat exchange pipeline is made of stainless steel pipe.

[0009] In an embodiment, the second heat exchange pipeline includes a plurality of second heat exchange tubes that are interconnected. Each second heat exchange tube is a smooth tube extending along a first direction, and the plurality of second heat exchange tubes are arranged at intervals along a second direction to form a heat exchange layer; the first direction and the second direction intersect.

[0010] In one embodiment, the condensing heat exchange component is located downstream of the main heat exchange component in the flue gas flow direction. The heat exchange layer includes a first heat exchange layer and a second heat exchange layer arranged at intervals in the flue gas flow direction. 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 forms a spiral coil structure that spirally winds and extends along the first direction. The first direction, the second direction and the flue gas flow direction intersect pairwise.

[0011] 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 arranged in a staggered manner.

[0012] In one embodiment, the second heat exchange pipeline is integrally formed by winding a single pipe.

[0013] In one embodiment, the heat exchanger further includes a water inlet pipe, a water outlet pipe and a bypass pipe. The water inlet end of the second heat exchange pipeline is connected to the water inlet pipe. The water inlet is provided at one end of the water inlet pipe away from the second heat exchange pipeline. The water outlet end of the first heat exchange pipeline is connected to the water outlet pipe. The water outlet is provided at one end of the water outlet pipe away from the first heat exchange pipeline. The bypass pipe connects the second heat exchange pipeline and the water outlet pipe.

[0014] In one embodiment, the heat exchanger further includes a first end plate and a second end plate. The first heat exchange pipeline includes a plurality of first heat exchange tubes arranged side by side. The plurality of first heat exchange tubes are connected through connecting elbows. The first end plate is provided with a first mounting hole for one end of the first heat exchange tube to pass through, and the second end plate is provided with a second mounting hole for the other end of the first heat exchange tube to pass through.

[0015] In one embodiment, the first end plate is provided with a first positioning hole for one end of the second heat exchange pipeline to pass through, and the second end plate is provided with a second positioning hole for the other end of the second heat exchange pipeline to pass through.

[0016] The present utility model further provides a water heater, including:

[0017] The heat exchanger as described above; and

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

[0019] The technical solution of the present utility model integrates the main heat exchange component and the condensation heat exchange component on a heat exchanger, and realizes two-stage heat exchange through an integrated heat exchanger, making the overall structure of the heat exchanger simpler and more compact, which is beneficial to reducing the volume. Moreover, the main heat exchange component is a tube-fin heat exchange structure formed by combining the first heat exchange pipeline and the fin group, which has a high heat exchange efficiency. The condensation heat exchange component is a tube heat exchange structure with a simpler structure formed by the second heat exchange pipeline, occupying less space, and the condensed water generated on the surface of the second heat exchange pipeline can quickly drip off to avoid blockage caused by condensed water, so as to ensure that the heat exchange efficiency is not affected. In this way, two-stage heat exchange is realized through a simpler heat exchanger structure, and the risk of condensed water blockage can be reduced, achieving efficient heat exchange. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

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

[0022] Figure 2 is Figure 1 the front view of the heat exchanger in FIG. 1 (some fins are omitted);

[0023] Figure 3 is Figure 1 the sectional structural diagram of the heat exchanger in FIG. 1;

[0024] Figure 4 is Figure 1 the exploded structural diagram of the heat exchanger in FIG. 1.

[0025] Explanation of the reference numerals in the drawings:

[0026] 100, heat exchanger; 10, main heat exchange component; 11, first heat exchange pipeline; 111, first heat exchange tube; 112, connecting elbow; 12, fin group; 121, fin; 20, condensation heat exchange component; 21, second heat exchange pipeline; 211, second heat exchange tube; 20a, first heat exchange layer; 20b, second heat exchange layer; 30, water inlet pipe; 31, water inlet; 40, water outlet pipe; 41, water outlet; 42, lifting section; 50, first end plate; 51, first mounting hole; 52, first positioning hole; 60, second end plate; 61, second mounting hole; 62, second positioning hole; 70, bypass pipe.

[0027] The realization, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings in conjunction with the embodiments. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0029] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0030] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or the solution where A and B are satisfied simultaneously. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0031] 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 the energy efficiency, it is necessary to utilize the latent heat of vaporization of flue gas and increase the condensation heat transfer. Currently, some gas water heaters include a main heat exchanger and a condensation heat exchanger. The high-temperature flue gas first contacts the main heat exchanger for main heat transfer, and then the flue gas contacts the condensation heat exchanger for condensation heat transfer, so that two-stage heat transfer can be achieved.

[0032] In the related art, some water heaters adopt a split design for the main heat exchanger and the condensation heat exchanger, which has a complex structure and a large overall occupied space, making it unfavorable for the miniaturization of the volume of the water heater. Moreover, both the main heat exchanger and the condensation heat exchanger adopt a finned tube heat exchange structure, which may cause condensed water to accumulate easily in the fin gaps, resulting in blockage of the condensed water, and instead being unfavorable for improving the heat exchange efficiency. Some heat exchangers of water heaters integrate two heat exchange components, one of which is a tube heat exchange structure and the other is a finned tube heat exchange structure. The flue gas first exchanges heat on the surface of the tube heat exchange structure and then exchanges heat on the surface of the finned tube heat exchange structure, while the external cold water first enters the finned tube heat exchange structure and then flows to the tube heat exchange structure and is discharged. Such a heat exchanger can reduce the stop water temperature rise to a certain extent, but the finned tube heat exchange structure is prone to accumulate condensed water, affecting the heat exchange efficiency.

[0033] Based on this, the present utility model proposes a heat exchanger 100, which realizes two-stage heat exchange through a simpler structure of the heat exchanger 100, reduces the risk of condensed water blockage, and improves the heat exchange efficiency.

[0034] Please refer to Figure 1 and Figure 2 , in an embodiment of the present utility model, the heat exchanger 100 includes a main heat exchange component 10 and a condensation heat exchange component 20. The main heat exchange component 10 includes a first heat exchange pipeline 11 and a fin group 12 sleeved outside the first heat exchange pipeline 11. The condensation heat exchange component 20 is located on one side of the main heat exchange component 10. The condensation heat exchange component 20 includes a second heat exchange pipeline 21. The water inlet end of the second heat exchange pipeline 21 is communicated with the water inlet 31 of the heat exchanger 100, the water outlet end of the second heat exchange pipeline 21 is communicated with the water inlet end of the first heat exchange pipeline 11, and the water outlet end of the first heat exchange pipeline 11 is communicated with the water outlet 41 of the heat exchanger 100.

[0035] The heat exchanger 100 includes a main heat exchange component 10 and a condensation heat exchange component 20. The condensation heat exchange component 20 and the main heat exchange component 10 can be arranged side by side vertically or horizontally, as long as both are located on the flue gas flow path, and the condensation heat exchange component 20 is located downstream of the main heat exchange component 10 in the flue gas flow direction. For example, when the flue gas flows from top to bottom, the condensation heat exchange component 20 is located below the first heat exchange component 10; when the flue gas flows from bottom to top, the condensation heat exchange component 20 is located above the main heat exchange component 10. When the flue gas flows from left to right, the condensation heat exchange component 20 is located on the right side of the first heat exchange component 10; when the flue gas flows from right to left, the condensation heat exchange component 20 is located on the left side of the main heat exchange component 10. For example, when the heat exchanger 100 is applied to a water heater, the burner of the water heater can be arranged on the side of the main heat exchange component 10 away from the condensation heat exchange component 20. In this way, the high-temperature flue gas first exchanges heat through the surface of the main heat exchange component 10, and then undergoes condensation heat exchange through the surface of the condensation heat exchange component 20; the external cold water can be first transported to the second heat exchange pipeline 21 for preheating through the water inlet 31, and then transported to the first heat exchange pipeline 11 for reheating and then hot water is output from the water outlet 41.

[0036] Among them, the main heat exchange component 10 adopts a tube-fin heat exchange structure. A fin group 12 is sleeved outside the first heat exchange pipeline 11. The fin group 12 generally includes a plurality of fins 121 arranged side by side. There is a small gap between adjacent fins 121 for the flue gas to pass through. In this way, the contact area with the high-temperature flue gas can be increased, and the heat exchange efficiency can be improved. The temperature of the flue gas after heat exchange with the main heat exchange component 10 is generally higher than the flue gas dew point temperature by a certain margin, and no condensed water will be generated on the surface of the main heat exchange component 10. Therefore, the main heat exchange component 10 adopting a tube-fin heat exchange structure will not cause the problem of condensed water clogging due to the accumulation of condensed water in the gaps between the fins 121. The condensation heat exchange component 20 adopts a tube heat exchange structure, which is simpler in structure and occupies less space. There are no fins 121 outside the second heat exchange pipeline 21, so that the condensed water generated on the surface of the second heat exchange pipeline 21 can quickly drip, so as to avoid the accumulation of condensed water in the gaps between the fins 121 and the occurrence of condensed water clogging.

[0037] The technical solution of the present utility model integrates the main heat exchange component 10 and the condensation heat exchange component 20 on a heat exchanger 100, and realizes two-stage heat exchange through the integrated heat exchanger 100, making the overall structure of the heat exchanger 100 simpler and more compact, which is beneficial to reducing the volume. Moreover, the main heat exchange component 10 is a tube-fin heat exchange structure formed by combining the first heat exchange pipeline 11 and the fin group 12, which has a high heat exchange efficiency. The condensation heat exchange component 20 is a tube heat exchange structure with a simpler structure formed by the second heat exchange pipeline 21, which occupies less space, and the condensed water generated on the surface of the second heat exchange pipeline 21 can quickly drip off to avoid blockage caused by condensed water, so as to ensure that the heat exchange efficiency is not affected. In this way, two-stage heat exchange is realized through the heat exchanger 100 with a simpler structure, and the risk of blockage caused by condensed water can be reduced, and efficient heat exchange can be achieved.

[0038] Optionally, the first heat exchange pipeline 11 is made of copper pipe, and the second heat exchange pipeline 21 is made of stainless steel pipe. In this way, the main heat exchange component 10 is a copper tube-fin structure, and the high thermal conductivity of copper and the enhanced heat exchange of the fin 121 can be used to strengthen heat exchange, so that the sensible heat energy of the flue gas can be fully utilized. The condensation heat exchange component 20 is a stainless steel tube heat exchange structure, which can prevent blockage by condensed water, and stainless steel has good corrosion resistance, which can prevent the surface of the second heat exchange pipeline 21 from being corroded by condensed water. Of course, in some embodiments, both the first heat exchange pipeline 11 and the second heat exchange pipeline 21 can also be made of copper pipes, and an anti-corrosion layer is provided on the outer surface of the second heat exchange pipeline 21. In addition, 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.

[0039] As Figure 1 shown, in an embodiment, the condensation heat exchange component 20 is located below the main heat exchange component 10. In this way, the condensed water generated on the surface of the condensation heat exchange component 20 can drip downward under the action of gravity, but will not drip into the gaps between the fins 121 of the main heat exchange component 10 and accumulate, which can further reduce the risk of blockage caused by condensed water. Optionally, the cross-sectional shape of the second heat exchange pipeline 21 is circular or elliptical to facilitate the rapid dripping of condensed water.

[0040] Of course, in some embodiments, when the flue gas flow direction is from bottom to top, the condensation heat exchange component 20 can also be arranged above the main heat exchange component 10. In this case, a drainage structure can be provided below the condensation heat exchange component 20 to drain the condensed water dripping from the condensation heat exchange component 20 to a preset position for discharge, so as to avoid the condensed water directly dripping onto the surface of the main heat exchange component 10.

[0041] The following mainly takes the flue gas flowing from top to bottom and the condensation heat exchange component 20 being located below the main heat exchange component 10 as an example for description.

[0042] AsFigures 2 to 4 As shown, in one embodiment, the second heat exchange pipeline 21 includes a plurality of second heat exchange tubes 211 that are interconnected. Each second heat exchange tube 211 is a smooth tube extending along the first direction. The plurality of second heat exchange tubes 211 are arranged at intervals along the second direction to form a heat exchange layer; the first direction and the second direction intersect.

[0043] In this embodiment, the first direction can be the length direction of the heat exchanger 100, and the second direction can be the width direction of the heat exchanger 100. Each second heat exchange tube 211 is a smooth tube extending along the first direction. The surface of the smooth tube is smoother, which is beneficial to the rapid dripping of condensed water and avoids the blockage of condensed water. The plurality of second heat exchange tubes 211 are arranged at intervals along the second direction to form a heat exchange layer, so that when the flue gas passes through one heat exchange layer, it can simultaneously exchange heat with a plurality of second heat exchange tubes 211, which is beneficial to increasing the heat exchange area and improving the heat exchange efficiency. Among them, the second heat exchange pipeline 21 can be configured with a single heat exchange layer, two heat exchange layers or more heat exchange layers in the flue gas flow path. The plurality of second heat exchange tubes 211 in the same heat exchange layer can be connected in series or in parallel.

[0044] Further, as Figure 3 and Figure 4 shown, in one embodiment, the condensation heat exchange assembly 20 is located downstream of the main heat exchange assembly 10 in the flue gas flow direction. The heat exchange layer includes a first heat exchange layer 20a and a second heat exchange layer 20b that are arranged at intervals in the flue gas flow direction; 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 alternately connected, so that the second heat exchange pipeline 21 has a spiral coil structure that spirally winds and extends along the first direction, and the first direction, the second direction and the flue gas flow direction intersect pairwise.

[0045] In this embodiment, the first direction may be the length direction of the heat exchanger 100, the second direction may be the width direction of the heat exchanger 100, and the flue gas flow direction may be along the height direction of the heat exchanger 100. 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 spirally wound and extended along the first direction. The water inlet and 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 winding a single tube in one piece. By adopting the above-mentioned winding method, the two ends of the curved pipe section of the second heat exchange pipeline 21 are arranged up and down, so that a larger 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 curved pipes.

[0046] like Figure 2 and Figure 3 As shown, in one embodiment, the first heat exchange layer 20a is located on the side of the second heat exchange layer 20b close to the first heat exchange pipeline 11, and the water outlet of the second heat exchange pipeline 21 extends from the first heat exchange layer 20a to be connected with the first heat exchange pipeline 11. In this way, the water outlet of the second heat exchange pipeline 21 can be arranged as close to the first heat exchange pipeline 11 as possible, thereby shortening the length of the connecting pipeline between the second heat exchange pipeline 21 and the first heat exchange pipeline 11, which is conducive to saving materials and reducing costs.

[0047] like Figure 3As shown, in one embodiment, the second heat exchange tubes 211 of the first heat exchange layer 20a are arranged staggeredly with the second heat exchange tubes 211 of the second heat exchange layer 20b. For example, the second heat exchange tubes 211 of the first heat exchange layer 20a can be opposite to the gap between two adjacent second heat exchange tubes 211 in the second heat exchange layer 20b. In this way, it can be avoided that the projections of two adjacent heat exchange layers in the flue gas flow direction completely overlap, so that the flue gas can fully contact the surfaces of the second heat exchange tubes 211 of each heat exchange layer during the flow process for heat exchange, thereby improving the heat exchange efficiency; in addition, the condensed water generated on the surfaces of the second heat exchange tubes 211 of the upper heat exchange layer can also drip downward from the gap between two adjacent second heat exchange tubes 211 of the lower heat exchange layer, ensuring that the condensed water can be discharged smoothly.

[0048] 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 can 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 overall cross-section of the second heat exchange pipeline 21 in the direction parallel to the flue gas flow direction can present a parallelogram structure; 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 overall cross-section of the second heat exchange pipeline 21 in the direction parallel to the flue gas flow direction can present a trapezoidal structure. Exemplarily, as Figure 3 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 are arranged staggeredly with the second heat exchange tubes 211 of the second heat exchange layer 20b, so that the cross-section of the second heat exchange pipeline 21 in the direction parallel to the flue gas flow direction presents an inverted trapezoidal structure with a wider upper part and a narrower lower part. When applied to a water heater, the heat exchanger 100 is arranged in the flue of the water heater, and the flue can be designed as a funnel-shaped structure adapted to the inverted trapezoidal structure of the above heat exchanger 100, so that the flue gas is more evenly distributed.

[0049] Optionally, the second heat exchange pipeline 21 is integrally formed by winding a single tube. In this way, the manufacturing process of the second heat exchange pipeline 21 can be simplified, so that the second heat exchange pipeline 21 does not need to be welded or spliced by multiple tubes, and the risk of water leakage can be reduced.

[0050] As Figure 1As shown, in one embodiment, the heat exchanger 100 further includes a water inlet pipe 30, a water outlet pipe 40, and a bypass pipe 70. The water inlet end of the second heat exchange pipeline 21 is connected to the water inlet pipe 30. The water inlet 31 is provided at one end of the water inlet pipe 30 away from the second heat exchange pipeline 21. The water outlet end of the first heat exchange pipeline 11 is connected to the water outlet pipe 40. The water outlet 41 is provided at one end of the water outlet pipe 40 away from the first heat exchange pipeline 11. The bypass pipe 70 connects the second heat exchange pipeline 21 and the water outlet pipe 40.

[0051] In this embodiment, when the heat exchanger 100 operates, external cold water is transported by the water inlet pipe 30 to the second heat exchange pipeline 21 for latent heat exchange with flue gas, and then flows to the first heat exchange pipeline 11 for sensible heat exchange with flue gas. The heated hot water is output from the water outlet pipe 40 to provide hot water for users. When hot water is output from the water outlet pipe 40, 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 70 for mixing, thereby reducing the temperature rise of the stopped water in the heat exchanger 100. For example, the water outlet end of the second heat exchange pipeline 21 is connected to the water inlet end of the first heat exchange pipeline 11 through a connecting pipe. One end of the bypass pipe 70 is connected to the connecting pipe, and the other end is connected to the water outlet pipe 40.

[0052] It can be understood that when the water pressure of the external water source pumped into the heat exchange pipe is insufficient, there may be a situation where the water in the first heat exchange pipeline 11 flows out of the water outlet pipe 40 before filling the entire pipe cavity. Since the water in the first heat exchange pipe 111 cannot fill the voids, when the burner heats the first heat exchange pipeline 11, the water in the pipe evaporates into high-temperature steam and impacts the pipe wall, generating vaporization noise.

[0053] To reduce the vaporization noise of the water heater, as Figure 1 shown, in one embodiment, the first heat exchange pipeline 11 is located above the second heat exchange pipeline 21. The water outlet pipe 40 includes a lifting section 42. The lowest height inside the lifting section 42 is not less than the highest height inside the first heat exchange pipeline 11. In this way, when the water flows out of the heat exchanger 100 through the water 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 admit water, the water level in the first heat exchange pipeline 11 can reach its highest point. Even when the heat exchanger 100 admits water in a small amount, the first heat exchange pipeline 11 can still be filled with water without leaving voids. When the first heat exchange pipeline 11 is heated, it can avoid the high-temperature vaporization of the water inside and the collision with the pipe wall at the void part to generate vaporization noise, improving the silent effect when the heat exchanger 100 is used.

[0054] Based on the above embodiments, as Figures 1 to 4As shown, in one embodiment, the heat exchanger 100 further includes a first end plate 50 and a second end plate 60. The first heat exchange pipeline 11 includes a plurality of first heat exchange tubes 111 arranged side by side. The plurality of first heat exchange tubes 111 are communicated through connecting elbows 112. The first end plate 50 is provided with a first mounting hole 51 for one end of the first heat exchange tube 111 to pass through, and the second end plate 60 is provided with a second mounting hole 61 for the other end of the first heat exchange tube 111 to pass through.

[0055] In this embodiment, each first heat exchange tube 111 extends along a first direction, and the plurality of first heat exchange tubes 111 are arranged side by side along a second direction. Two adjacent first heat exchange tubes 111 are connected in series through a connecting elbow 112. The first end plate 50 is provided with a first mounting hole 51 for one end of the first heat exchange tube 111 to pass through, and the second end plate 60 is provided with a second mounting hole 61 for the other end of the first heat exchange tube 111 to pass through. The first heat exchange pipeline 11 can be supported and fixed by the first end plate 50 and the second end plate 60. The plurality of first heat exchange tubes 111 can be arranged in one layer, two layers or more in the flue gas flow direction. Optionally, the plurality of first heat exchange tubes 111 are spaced apart and arranged in a single-layer structure, and the plurality of first heat exchange tubes 111 can be connected in series through connecting elbows 112 to form a first heat exchange pipeline 11 extending in a circuitous manner. A plurality of fins 121 are arranged along the first direction to form a fin group 12. Each fin 121 is provided with a plurality of through holes, wherein the number of through holes is adapted to the number of first heat exchange tubes 111. Exemplarily, as Figure 3 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 through holes arranged in a single row, and the first heat exchange tubes 111 are inserted and matched with the through holes on the fins 121 one by one. Of course, the number of first heat exchange tubes 111 is not limited to four, and can also be three, five or more, for example. A gap for flue gas to pass through is formed between two adjacent fins 121. The high-temperature flue gas passes through the gaps between the fins 121 along the incoming flow direction, sweeps across the surfaces of the fins 121, and realizes the heat transfer from the high-temperature flue gas to the fins 121, so as to heat the water in the first heat exchange tubes 111, and the heat exchange efficiency can be effectively improved.

[0056] Further, as Figure 1 and Figure 4 shown, in one embodiment, the first end plate 50 is provided with a first positioning hole 52 for one end of the second heat exchange pipeline 21 to pass through, and the second end plate 60 is provided with a second positioning hole 62 for the other end of the second heat exchange pipeline 21 to pass through.

[0057] In this embodiment, the water inlet end of the second heat exchange pipeline 21 can pass through the first positioning hole 52 to be connected to the water inlet pipe 30, and the water outlet end of the second heat exchange pipeline 21 can pass through the second positioning hole 62 to be connected to the first heat exchange pipeline 11. In this way, through the first end plate 50 and the second end plate 60, not only can the first heat exchange pipeline 11 be supported, but also the second heat exchange pipeline 21 can be supported, which is beneficial to simplifying the structure of the heat exchanger 100, saving materials, reducing costs, and at the same time reducing the volume of the heat exchanger 100. Optionally, the second positioning hole 62 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.

[0058] The present utility model also provides a water heater, which includes a heat exchanger 100 and a burner, and the burner is located on the side of the main heat exchange component 10 away from the condensation heat exchange component 20. The specific structure of this heat exchanger 100 refers to the above embodiment. Since this water heater adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0059] In this embodiment, the burner can be located below the heat exchanger 100. Then, the condensation heat exchange component 20 of the heat exchanger 100 is located above the main heat exchange component 10, and the flue gas generated by the combustion of the burner flows from bottom to top and passes through the main heat exchange component 10 and the condensation heat exchange component 20 in sequence for heat exchange. Alternatively, the burner can be located above the heat exchanger 100. Then, the main heat exchange component 10 of the heat exchanger 100 is located above the condensation heat exchange component 20, and the flue gas generated by the combustion of the burner flows from top to bottom and passes through the main heat exchange component 10 and the condensation heat exchange component 20 in sequence for heat exchange.

[0060] The above are only exemplary embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.

Claims

1. A heat exchanger, characterized in that: include: The main 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 condensing heat exchange component is located on one side of the main heat exchange component, and the condensing heat exchange component includes a second heat exchange pipeline, the water inlet end of the second heat exchange pipeline is connected to the water inlet of the heat exchanger, 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 of the heat exchanger.

2. The heat exchanger according to claim 1, characterized in that The condensing heat exchange component is located below the main heat exchange component; And / or, the first heat exchange pipeline adopts a copper tube, and the second heat exchange pipeline adopts a stainless steel tube.

3. The heat exchanger according to claim 1, 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 is a light tube extending along the first direction, and the plurality of second heat exchange tubes are arranged at intervals along the second direction to form a heat exchange layer; the first direction and the second direction intersect.

4. The heat exchanger according to claim 3, characterized in that The condensing heat exchange component is located downstream of the main heat exchange component in the direction of flue gas flow, and the heat exchange layer includes a first heat exchange layer and a second heat exchange layer arranged at intervals in the direction of flue gas flow; the second heat exchange tube of the first heat exchange layer and the second heat exchange tube 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, and 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 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.

6. The heat exchanger according to claim 3, characterized in that The second heat exchange pipeline is formed by integrally winding a single pipe.

7. The heat exchanger according to claim 1, characterized in that: The heat exchanger also includes a water inlet pipe, a water outlet pipe and a bypass pipe. The water inlet end of the second heat exchange pipeline is connected to the water inlet pipe, and the water inlet is provided at the end of the water inlet pipe away from the second heat exchange pipeline. The water outlet end of the first heat exchange pipeline is connected to the water outlet pipe, and the water outlet is provided at the end of the water outlet pipe away from the first heat exchange pipeline. The bypass pipe connects the second heat exchange pipeline with the water outlet pipe.

8. The heat exchanger according to any one of claims 1 to 7, characterized in that: The heat exchanger also includes a first end plate and a second end plate. The first heat exchange pipeline includes a plurality of first heat exchange tubes arranged side by side. The plurality of first heat exchange tubes are connected by connecting elbows. The first end plate is provided with a first mounting hole for one end of the first heat exchange tube to pass through, and the second end plate is provided with a second mounting hole for the other end of the first heat exchange tube to pass through.

9. The heat exchanger according to claim 8, characterized in that The first end plate is provided with a first positioning hole for one end of the second heat exchange pipeline to pass through, and the second end plate is provided with a second positioning hole for the other end of the second heat exchange pipeline to pass through.

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

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