Heat exchanger and water heater

Abstract

The utility model discloses a heat exchanger and a water heater, and relates to the technical field of water heaters, the heat exchanger comprises a main heat exchange assembly and a condensation heat exchange assembly; the main heat exchange assembly comprises a first heat exchange pipeline, the condensation heat exchange assembly and the main heat exchange assembly are oppositely arranged, the condensation heat exchange assembly comprises two water boxes and a plurality of second heat exchange pipes arranged between the two water boxes, and the two ends of each second heat exchange pipe communicate with the two water boxes correspondingly, so that the second heat exchange pipes communicate to form a second heat exchange pipeline; the water outlet end of the second heat exchange pipeline is communicated with the water inlet end of the first heat exchange pipeline; the two ends of the second heat exchange pipes are communicated with the water boxes respectively to form the second heat exchange pipeline, the second heat exchange pipes located between the two water boxes can be arranged at will, the whole height and the arrangement size of the second heat exchange pipeline are reduced while a large amount of water is achieved through the second heat exchange pipeline, and the heat exchange efficiency is improved. Therefore, the height and size of the heat exchanger are reduced.

Description

Technical Field

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

[0002] In order to improve the thermal energy utilization efficiency of the burner, the existing technical solution adopts a two-stage heat exchange solution for heat exchange. Due to the two-stage heat exchange method, two groups of heat exchangers need to be set up, resulting in the volume of the heat exchanger being higher than the heat exchanger that generally adopts one-stage heat exchange. When the heat exchanger is applied to the water heater, the volume of the water heater will be larger than that of the general water heater, and the installation environment requirements of the water heater are higher. Utility Model Content

[0003] The main purpose of the utility model is to provide a heat exchanger and a water heater, aiming to reduce the overall height and arrangement volume of the second heat exchange pipeline, so as to reduce the height and volume of the heat exchanger.

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

[0005] a main heat exchange assembly, the main heat exchange assembly comprising a first heat exchange pipeline; and

[0006] A condensing heat exchange component is arranged opposite to the main heat exchange component, and the condensing heat exchange component includes two water boxes and a plurality of second heat exchange tubes arranged between the two water boxes, and both ends of each second heat exchange tube are respectively connected to the two water boxes, so that a plurality of second heat exchange tubes are connected to form a second heat exchange pipeline, and the water outlet end of the second heat exchange pipeline is connected to the water inlet end of the first heat exchange pipeline.

[0007] In one embodiment, both ends of the second heat exchange pipeline are respectively provided with a water inlet cavity for connecting to a water inlet pipe, and a water outlet cavity connecting to the water inlet end of the first heat exchange pipeline;

[0008] The water inlet chamber is provided in one of the water boxes, and the water outlet chamber is provided in the other water box;

[0009] Alternatively, the water inlet chamber and the water outlet chamber are both arranged in the same water box.

[0010] In one embodiment, the second heat exchange pipeline includes a plurality of heat exchange pipe sections connected in series, each of the heat exchange pipe sections includes at least one second heat exchange tube, wherein at least one of the water boxes is provided with a reversing water cavity, and the same end of the second heat exchange tubes in two adjacent heat exchange pipe sections is connected to the same reversing water cavity.

[0011] In one embodiment, at least one of the heat exchange tube sections includes a plurality of the second heat exchange tubes arranged in parallel.

[0012] In one embodiment, each of the heat exchange pipe sections includes a plurality of second heat exchange pipes arranged in parallel, and the number of second heat exchange pipes in each of the heat exchange pipe sections is the same.

[0013] In one embodiment, the two water boxes are arranged relative to each other along a first direction, and the second heat exchange pipeline constructs at least one heat exchange layer opposite to the main heat exchange component in the second direction, and the heat exchange layer includes a plurality of the second heat exchange tubes arranged relative to each other along a third direction, and the first direction, the second direction and the third direction intersect each other.

[0014] In one embodiment, the distance between two adjacent second heat exchange tubes in the same heat exchange layer is not less than 2 mm and not more than 4 mm.

[0015] In one embodiment, the outer diameter of the second heat exchange tube is not less than 5 mm and not more than 10 mm.

[0016] In one embodiment, the main heat exchange assembly further includes a fin group, and the fin group is disposed through the first heat exchange pipeline;

[0017] And / or, 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.

[0018] In one embodiment, the heat exchanger also includes two end plates arranged opposite to each other, the main heat exchange assembly is installed between the two end plates, each end plate includes an outer plate body and an inner plate body, and the outer plate body and inner plate body of each end plate are combined to form a water box.

[0019] The utility model also provides a water heater, comprising the heat exchanger as described above; and

[0020] A burner is located on a side of the main heat exchange component away from the condensing heat exchange component.

[0021] The technical solution of the utility model replaces the traditional method of connecting two second heat exchange tubes through a reversing pipe by arranging water boxes on both sides of the second heat exchange tube and connecting the second heat exchange tube to the water boxes. The multiple second heat exchange tubes located between the two water boxes can be arranged arbitrarily, and the tube diameter size and arrangement density of the multiple second heat exchange tubes are not restricted. Therefore, second heat exchange tubes with finer tube diameters can be used, and the arrangement spacing of adjacent second heat exchange tubes can be made smaller, so that the second heat exchange tube can achieve a large water volume while reducing the overall height and arrangement volume of the second heat exchange tube, which is beneficial to reducing the height and volume of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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.

[0023] Figure 1 A schematic structural diagram of an embodiment of a heat exchanger provided by the utility model;

[0024] Figure 2 for Figure 1 Another angle diagram of the heat exchanger;

[0025] Figure 3 It is a schematic diagram of the internal flow path of the second heat exchange pipeline in the utility model;

[0026] Figure 4 for Figure 1 Structural explosion diagram of the heat exchanger;

[0027] Figure 5 for Figure 4 A schematic structural diagram of an embodiment of the middle and outer plates;

[0028] Figure 6 for Figure 4 A schematic structural diagram of another embodiment of the middle and outer plates;

[0029] Figure 7 for Figure 4 A schematic structural diagram of an embodiment of the cooperation between the middle and outer plates and the inner plate;

[0030] Figure 8 for Figure 4 A schematic structural diagram of another embodiment of the cooperation between the inner and outer panels.

[0031] Description of Figure Numbers:

[0032] 100, heat exchanger; 10, main heat exchange assembly; 11, first heat exchange pipeline; 12, fin group; 20, condensing heat exchange assembly; 21, water box; 211, reversing water chamber; 22, second heat exchange pipeline; 221, second heat exchange tube; 222, water inlet chamber; 223, water outlet chamber; 30, end plate; 31, outer plate body; 32, inner plate body; 321, connection hole; 322, reversing port; 40, water outlet port; 50, water inlet port; 60, water outlet pipe; 70, water inlet pipe.

[0033] 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

[0034] 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.

[0035] 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.

[0036] 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.

[0037] In order to improve the thermal energy utilization efficiency of the burner, the existing technical solution adopts a two-stage heat exchange solution for heat exchange. Due to the two-stage heat exchange method, two groups of heat exchangers need to be set up, resulting in the volume of the heat exchanger being higher than the heat exchanger that generally adopts one-stage heat exchange. When the heat exchanger is applied to the water heater, the volume of the water heater will be larger than that of the general water heater, and the installation environment requirements of the water heater are higher.

[0038] A heat exchanger disclosed in the prior art includes a first heat exchange component and a second heat exchange component arranged in sequence on a flue gas flow path. The first heat exchange component and the second heat exchange component each include a plurality of heat exchange pipelines connected by heat exchange tubes. The two are arranged at an interval, so that the overall thickness of the heat exchanger becomes larger. When the heat exchanger is applied to a water heater, the overall volume of the water heater will be larger.

[0039] Alternatively, a low temperature corrosion resistant heat exchange device coated with a composite crystal film disclosed in the prior art includes a fin-tube heat exchanger, a secondary light tube heat exchanger, and a tertiary light tube heat exchanger arranged in a shell from top to bottom. Since the above heat exchange device is provided with multiple layers of heat exchange components, its overall thickness will become larger, resulting in the entire heat exchange device becoming very high, and the heat exchange device will have high requirements for installation space.

[0040] The utility model provides a heat exchanger 100 .

[0041] See also Figures 1 to 8 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 is arranged opposite to the main heat exchange component 10, the condensing heat exchange component 20 includes two water boxes 21, and a plurality of second heat exchange tubes 221 arranged between the two water boxes 21, and both ends of each second heat exchange tube 221 are respectively connected to the two water boxes 21, so that the plurality of second heat exchange tubes 221 are connected to form a second heat exchange pipeline 22, and the water outlet end of the second heat exchange pipeline 22 is connected to the water inlet end of the first heat exchange pipeline 11.

[0042] In the utility model, when the heat exchanger 100 is in use, the main heat exchange component 10 can be set at a position close to the burner, and the condensing heat exchange component 20 can be set at a position away from the burner, and the main heat exchange component 10 and the condensing heat exchange component 20 can be arranged in an upper and lower distribution manner. When the condensing heat exchange component 20 with a lower temperature is exchanging heat, it is convenient for the condensed water generated by the condensing heat exchange component 20 to drip downward.

[0043] In addition, the technical solution of the utility model replaces the traditional method of connecting two second heat exchange tubes 221 through a reversing pipe by arranging water boxes 21 on both sides of the second heat exchange tube 221 and connecting the second heat exchange tube 221 with the water boxes 21. The multiple second heat exchange tubes 221 located between the two water boxes 21 can be arranged arbitrarily, and the tube diameter size and arrangement density of the multiple second heat exchange tubes 221 are not restricted. Therefore, second heat exchange tubes 221 with a smaller diameter can be used, and the arrangement spacing of adjacent second heat exchange tubes 221 can be made smaller, so that the second heat exchange pipeline 22 can achieve a large water volume while helping to reduce the overall height and arrangement volume of the second heat exchange pipeline 22.

[0044] See also Figure 4 , Figure 5 , Figure 6 As shown, in the embodiment of the present utility model, both ends of the second heat exchange pipeline 22 are respectively provided with a water inlet cavity 222 for connecting to the water inlet pipe, and a water outlet cavity 223 connecting to the water inlet end of the first heat exchange pipeline 11;

[0045] The water inlet chamber 222 is disposed in one of the water boxes 21 , and the water outlet chamber 223 is disposed in the other water box 21 ;

[0046] Alternatively, the water inlet chamber 222 and the water outlet chamber 223 are both disposed in the same water box 21 .

[0047] In the above embodiment, when the water inlet chamber 222 is provided in one of the water boxes 21 and the water outlet chamber 223 is provided in the other water box 21, the water inlet end and the water outlet end of the second heat exchange pipe 22 are respectively provided on both sides of the condensing heat exchange component 20, and the second heat exchange pipe 22 can be used to flow directly from one water box 21 to the other water box 21. In other words, one water box 21 is only provided with the water inlet chamber 222, and the other water box 21 is only provided with the water outlet chamber 223, and the flow directions of all the second heat exchange pipes 221 are the same.

[0048] Or in other embodiments, the second heat exchange pipeline 22 takes in water from the water inlet chamber 222 of one water box 21, then flows to the other water box 21, flows to the first water box 21 after changing direction from the other water box 21, and then flows to the water outlet chamber 223 of the other water box 21 after changing direction from the first water box 21, and flows from the water outlet chamber 223 to the first heat exchange pipeline 11. The water flow direction in the second heat exchange pipeline 22 adopts an odd-numbered winding manner, which is not limited here.

[0049] In addition, when the water inlet chamber 222 and the water outlet chamber 223 are arranged in the same water box 21, the second heat exchange pipeline 22 can first take in water from the water inlet chamber 222 of one water box 21, and then flow from the water inlet chamber 222 to the other water box 21, and then flow to the water outlet chamber 223 of the previous water box 21 after reversing through the other water box 21, and then flow to the first heat exchange pipeline 11 through the water outlet chamber 223, so that the flow direction of the second heat exchange pipeline 22 adopts a two-stage circuitous winding manner.

[0050] Alternatively, in other embodiments, the second heat exchange pipeline 22 may flow to another water box 21 after water enters the water inlet chamber 222 of a water box 21, and then flow to the upper water box 21 through the other water box 21, and then flow to another water box 21 after changing direction from the upper water box 21, and finally flow to the water outlet chamber 223 of the upper water box 21 through the other water box 21, so that the water flow direction in the second heat exchange pipeline 22 adopts an even-numbered winding manner, which is not limited here.

[0051] See also Figure 3 As shown, in an embodiment of the utility model, the second heat exchange pipeline 22 includes a plurality of heat exchange pipe sections connected in series, each heat exchange pipe section includes at least one second heat exchange tube 221, wherein at least one water box 21 is provided with a reversing water cavity 211, and the same end of the second heat exchange tube 221 in two adjacent heat exchange pipe sections is connected to the same reversing water cavity 211.

[0052] In the above embodiment, when the second heat exchange pipeline 22 includes a plurality of heat exchange pipe sections connected in series, the flow direction of water in the entire second heat exchange pipeline 22 is a circuitous winding manner. To this end, a reversing water chamber 211 can be provided at the intersection of the two heat exchange pipe sections, and the reversing water chamber 211 is provided in the water box 21.

[0053] When the second heat exchange pipeline 22 adopts only one section of circuitous setting, that is, when the second heat exchange pipeline 22 only includes two heat exchange pipe sections, the water inlet chamber 222 and the water outlet chamber 223 of the second heat exchange pipeline 22 are both provided with the same water box 21, and the connection between the two heat exchange pipe sections is provided in another water box 21. For this purpose, a reversing water chamber 211 can be provided in the above-mentioned other water box 21 to connect the two heat exchange pipe sections.

[0054] When the second heat exchange pipeline 22 is arranged with at least three odd-numbered heat exchange pipe sections in a circuitous manner, or when the second heat exchange pipeline 22 is arranged with at least four even-numbered heat exchange pipe sections in a circuitous manner, each water box 21 is provided with a reversing water cavity 211 .

[0055] Continue reading Figure 3 In an embodiment of the present utility model, at least one heat exchange pipe section includes a plurality of second heat exchange pipes 221 arranged in parallel.

[0056] In the above-mentioned embodiment, when at least one heat exchange tube segment includes a plurality of second heat exchange tubes 221 arranged in parallel, the heat exchange tube segment can ensure a larger water flow rate while reducing the overall thickness of the heat exchange tube segment, and when the arrangement spacing between two adjacent second heat exchange tubes 221 of the heat exchange tube segment is small enough, the overall width of the heat exchange tube segment can also be reduced, so that the heat exchange tube segment can maintain a smaller volume while achieving a large flow rate.

[0057] Continue reading Figure 3 In an embodiment of the present utility model, each heat exchange pipe section includes a plurality of second heat exchange pipes 221 arranged in parallel, and the number of the second heat exchange pipes 221 in each heat exchange pipe section is the same.

[0058] Such an arrangement enables each heat exchange pipe section to achieve a large flow rate, thereby enabling the entire second heat exchange pipeline 22 to achieve a large flow rate. Furthermore, since each second heat exchange pipe section is provided with a plurality of second heat exchange pipes 221 of the same number, when the inner diameters of each second heat exchange pipe 221 are the same, the flow rate and flow rate of each heat exchange pipe section are the same, so that the water pressure borne by each second heat exchange pipe 221 is the same, and the arrangement of the second heat exchange pipes 221 in the condensing heat exchange assembly 20 can be more regular.

[0059] See also Figure 1 , Figure 2 , Figure 4In an embodiment of the utility model, the two water boxes 21 are arranged relatively spaced apart along the first direction, and the second heat exchange pipeline 22 constructs at least one heat exchange layer opposite to the main heat exchange component 10 in the second direction. The heat exchange layer includes a plurality of second heat exchange tubes 221 arranged at intervals along the third direction, and the first direction, the second direction and the third direction intersect with each other.

[0060] In the above embodiment, when the main heat exchange assembly 10 and the condensing heat exchange assembly 20 are arranged in the up-down direction, the first direction may be along the length direction of the heat exchanger 100, the second direction may be along the height direction of the heat exchanger 100, and the third direction may be along the width direction of the heat exchanger 100. In this way, the multiple heat exchange layers can be arranged at intervals in the height direction, so that the second heat exchange pipeline 22 is provided with multiple rows of second heat exchange tubes 221 in the height direction.

[0061] To this end, one of the water boxes 21 can be provided with a plurality of reversing water chambers 211 arranged at intervals along the height direction, and the other water box 21 can also be provided with a plurality of reversing water chambers 211 arranged at intervals along the height direction. When two series-connected heat exchange pipe sections are connected through the above-mentioned reversing water chambers 211, one of the heat exchange pipe sections can be connected to the upper end of the above-mentioned reversing water chamber 211, and the other heat exchange pipe section can be connected to the lower end of the above-mentioned reversing water chamber 211, so that the second heat exchange pipeline 22 can achieve reversal from one heat exchange layer to another heat exchange layer.

[0062] In the embodiment of the present utility model, the distance between two adjacent second heat exchange tubes 221 in the same heat exchange layer is not less than 2 mm and not more than 4 mm.

[0063] In the above-mentioned embodiment, the distance between two adjacent second heat exchange tubes 221 can be set to 2 mm, 3 mm or 4 mm, etc. Such a setting can keep the distance between two adjacent second heat exchange tubes 221 of each layer at a smaller value, so that the second heat exchange tubes 221 of each layer can be kept at a smaller volume, and at the same time, the distance between two adjacent second heat exchange tubes 221 will not be too small, which will affect the flue gas and condensed water passing through the gap between the two adjacent second heat exchange tubes 221.

[0064] In the embodiment of the present utility model, the outer diameter of the second heat exchange tube 221 is not less than 5 mm and not more than 10 mm.

[0065] In the above embodiments, the outer diameter of the second heat exchange tube 221 may be set to 5 mm, 7 mm, or 10 mm.

[0066] Such a configuration can make the overall diameter of the second heat exchange tube 221 small enough, so that when the second heat exchange pipeline 22 is only provided with one heat exchange layer, the thickness of the second heat exchange pipeline 22 can be made thin enough, thereby reducing the volume of the condensing heat exchange component 20 and making the overall size of the heat exchanger 100 smaller.

[0067] In addition, when a plurality of second heat exchange pipes 221 are connected in parallel to the water box 21, the second heat exchange pipe 22 can maintain a sufficiently large water flow rate on the basis of making the thickness of the second heat exchange pipe 22 sufficiently thin.

[0068] Furthermore, when the water flow rate of the second heat exchange pipeline 22 is constant, the outer diameter of each second heat exchange tube 221 can be made smaller when more second heat exchange tubes 221 are arranged in parallel; conversely, the outer diameter of each second heat exchange tube 221 can be made larger when fewer second heat exchange tubes 221 are arranged in parallel, or when the second heat exchange tubes 221 are only connected in series.

[0069] See also Figure 1 , Figure 2 , Figure 4 In the embodiment of the utility model, the main heat exchange component 10 further includes a fin group 12, and the fin group 12 is disposed in the first heat exchange pipeline 11;

[0070] And / or, 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.

[0071] In the present invention, the first heat exchange pipeline 11 may include a plurality of first heat exchange tubes arranged along the third direction mentioned above, the plurality of first heat exchange tubes are arranged between the two end plates 30, and the plurality of first heat exchange tubes are sequentially connected in series to form the first heat exchange pipeline 11. The first heat exchange pipeline 11 also includes a first connecting elbow connecting adjacent first heat exchange tubes in series. Specifically, the two ends of the first heat exchange tube are respectively passed through and fixed to the two end plates 30, and the two ends of the first connecting elbow are respectively connected to the ends of the two adjacent first heat exchange tubes, so that the two adjacent first heat exchange tubes are connected in series through the connecting elbow. When any two adjacent first heat exchange tubes are connected in series through the first connecting elbow, the plurality of first heat exchange tubes are sequentially connected in series to form the first heat exchange pipeline 11.

[0072] In the above-mentioned embodiment, the fin group 12 can be composed of a plurality of fins arranged side by side, and the plurality of fins are arranged side by side between the two end plates 30 along the above-mentioned first direction, and the plurality of fins are penetrated with holes, and the plurality of fins are penetrated in the plurality of first heat exchange tubes through the holes. That is to say, after the fins are connected to the first heat exchange tube, the outer periphery of the first heat exchange tube fits the inner wall of the holes. Among them, there is a small gap between two adjacent fins for the flue gas to pass through, so that the contact area with the high-temperature flue gas can be increased. After the fins absorb heat, the heat absorbed by the fins can be transferred to the first heat exchange tube to achieve heating of the water inside the heat exchange tube and improve the heat exchange efficiency. Since 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, no condensed water will be generated on the surface of the main heat exchange component 10. Therefore, the main heat exchange component 10 adopts a tube-fin heat exchange structure, and there will be no problem of condensed water accumulating in the fin gap and causing condensed water blockage.

[0073] In the above-mentioned embodiment, since the condensing heat exchange component 20 is located downstream of the main heat exchange component 10 in the direction of flue gas flow, the temperature at the location of the main heat exchange component 10 is higher. For this reason, a fin group 12 can be provided on the main heat exchange component 10. By providing the fin group 12 to pass through the first heat exchange pipeline 11, the heat exchange area of ​​the first heat exchange pipeline 11 can be increased, so that heat exchange can be performed more effectively, thereby improving the heat exchange efficiency of the main heat exchange component 10.

[0074] At the same time, since the temperature of the condensing heat exchange component 20 is relatively low in the utility model, it is easier to generate condensed water in the condensing heat exchange component 20. For this reason, the condensing heat exchange component 20 is arranged below the main heat exchange component 10, and no heat exchange fins are arranged on the second heat exchange pipeline 22 of the condensing heat exchange component 20. When condensed water is generated on the outside of the second heat exchange pipeline 22, the condensed water can be easily dripped, thereby preventing the condensed water from accumulating on the outer surface of the second heat exchange pipeline 22 and mixing with the acidic components in the flue gas to cause corrosion to the outer surface of the pipeline.

[0075] See also Figure 4 , Figure 7 , Figure 8 As shown, in an embodiment of the present utility model, the heat exchanger 100 also includes two end plates 30 arranged opposite to each other, and the main heat exchange component 10 is installed between the two end plates 30. Each end plate 30 includes an outer plate body 31 and an inner plate body 32. The outer plate body 31 and the inner plate body 32 of each end plate 30 enclose a water box 21.

[0076] In the utility model, the end plate 30 on the traditional heat exchanger 100 can be modified so that the end plate 30 is composed of an outer plate body 31 and an inner plate body 32, and one or more protrusions can be set on the outer plate body 31, and one or more depressions can be set on the side of the protrusion facing the inner plate body 32. When the outer plate body 31 and the inner plate body 32 are spliced, the above-mentioned depressions can be closed with the inner plate body 32 to form a water inlet chamber 222, a water outlet chamber 223 and a reversing water chamber 211.

[0077] The protrusion can be provided in an integrally formed manner with the outer plate body 31 , or an opening can be reserved on the outer plate body 31 , and the protrusion can be welded to the reserved opening by brazing to be combined with the outer plate body 31 .

[0078] This arrangement can make the arrangement of the water box 21 simpler, and only requires splicing the outer plate 31 and the inner plate 32 to form it, which can reduce the assembly cost of the condensing heat exchange component 20. It is also simpler than using a reversing pipe section to connect the two second heat exchange tubes 221.

[0079] In addition, in the utility model, a plurality of connection holes 321 for the second heat exchange pipe 22 to pass through are provided on the inner plate body 32. After the inner plate body 32 and the outer plate body 31 are assembled, the connection holes 321 are connected to the water box 21, wherein some of the connection holes 321 are connected to the water inlet chamber 222, some of the connection holes 321 are connected to the water outlet chamber 223, and other some of the connection holes 321 are connected to the reversing water chamber 211, so that the plurality of second heat exchange pipes 221 can be respectively inserted into the above-mentioned water inlet chamber 222, the water outlet chamber 223 and the reversing water chamber 211, and connected to the above-mentioned chambers.

[0080] Furthermore, when the water inlet chamber 222 and the water outlet chamber 223 are respectively arranged in two water boxes 21, one of the water boxes 21 is provided with a water inlet port 50 for water inletting into the heat exchanger 100, and the water inlet port 50 is used to connect the water inlet pipe 70, and the water inlet pipe 70 is used for water inlet into the heat exchanger 100. The other water box 21 is provided with a reversing port 322 for connecting to the first heat exchange pipeline 11, and the reversing port 322 can be opened in the inner plate body 32 or in the outer plate body 31.

[0081] The utility model further comprises a water outlet port 40 , which is arranged at the water outlet end of the first heat exchange pipeline 11 , and is used to connect to a water outlet pipe 60 , and the water outlet pipe 60 is used to outlet water from the heat exchanger 100 .

[0082] See also Figure 1As shown, in order to reduce the vaporization noise of the water heater, in one embodiment, the first heat exchange pipeline 11 is located above the second heat exchange pipeline 22, and the water outlet pipe 60 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, 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 mute effect of the heat exchanger 100 when in use.

[0083] In some embodiments of the present invention, the first heat exchange pipeline 11 can be made of copper tubes, and the second heat exchange pipeline 21 can be made of stainless steel tubes. In this way, the main heat exchange component 10 is a copper tube fin structure, which can utilize the high thermal conductivity of copper and the enhanced heat exchange energy of the fin group 12 to enhance the heat exchange, thereby making full use of the sensible heat energy of the flue gas. The condensation heat exchange component 20 is a stainless steel tubular heat exchange structure, which can prevent condensation water from clogging, and stainless steel has good corrosion resistance, which can prevent condensation water from corroding the surface of the second heat exchange pipeline 21.

[0084] Of course, in some embodiments, the first heat exchange pipeline 11 and the second heat exchange pipeline 21 may both be made of copper pipes, and the outer surface of the second heat exchange pipeline 21 is provided with an anti-corrosion layer.

[0085] The utility model also provides a water heater, which includes a burner and a heat exchanger 100. 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 described one by one here. Among them, the burner is located on the side of the main heat exchange component 10 away from the condensing heat exchange component 20.

[0086] In this embodiment, the burner can be located below the heat exchanger 100, and the condensing heat exchange component 20 of the heat exchanger 100 is located above the main heat exchange component 10, and the flue gas generated by the burner combustion flows from bottom to top, and passes through the main heat exchange component 10 and the condensing heat exchange component 20 in sequence for heat exchange. Alternatively, the burner can be located above the heat exchanger 100, and the main heat exchange component 10 of the heat exchanger 100 is located above the condensing heat exchange component 20, and the flue gas generated by the burner combustion flows from top to bottom, and passes through the main heat exchange component 10 and the condensing heat exchange component 20 in sequence for heat exchange.

[0087] In the present invention, the main heat exchange component 10 is closer to the burner than the condensing heat exchange component 20. Specifically, when the water heater of the present invention is working, the temperature of the main heat exchange component 10 will be higher. Since the present invention adopts the method of water inlet of the condensing heat exchange component 20 and water outlet of the main heat exchange component 10, the water flowing inside the water heater will be preheated at the position of the condensing heat exchange component 20 with a lower temperature, and further heated at the position of the main heat exchange component 10 with a higher temperature, so that the water temperature reaches the value preset for the water heater. Such a setting makes the heat utilization efficiency of the water heater higher, thereby improving the energy efficiency of the water heater.

[0088] It is understandable that the water heater of the utility model can be a gas water heater, wherein the gas water heater can be a strong-drum gas water heater or a strong-extraction gas water heater. The water heater can also include a housing for mounting the burner and the heat exchanger 100, an exhaust fan or a blower arranged in the housing, and a smoke exhaust component for exhausting combustion smoke.

[0089] 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 component, the main heat exchange component comprising a first heat exchange pipeline; as well as A condensing heat exchange component is arranged opposite to the main heat exchange component, and the condensing heat exchange component includes two water boxes and a plurality of second heat exchange tubes arranged between the two water boxes, and both ends of each of the second heat exchange tubes are respectively connected to the two water boxes, so that a plurality of the second heat exchange tubes are connected to form a second heat exchange pipeline, and the water outlet end of the second heat exchange pipeline is connected to the water inlet end of the first heat exchange pipeline.

2. The heat exchanger according to claim 1, characterized in that Both ends of the second heat exchange pipeline are respectively provided with a water inlet cavity for connecting to a water inlet pipe, and a water outlet cavity connecting to the water inlet end of the first heat exchange pipeline; The water inlet chamber is provided in one of the water boxes, and the water outlet chamber is provided in the other water box; Alternatively, the water inlet chamber and the water outlet chamber are both arranged in the same water box.

3. The heat exchanger according to claim 1, characterized in that The second heat exchange pipeline includes a plurality of heat exchange pipe sections connected in series, each of the heat exchange pipe sections includes at least one second heat exchange tube, at least one of the water boxes is provided with a reversing water cavity, and the same end of the second heat exchange tubes in two adjacent heat exchange pipe sections is connected to the same reversing water cavity.

4. The heat exchanger according to claim 3, characterized in that At least one of the heat exchange tube sections includes a plurality of the second heat exchange tubes arranged in parallel.

5. The heat exchanger according to claim 4, characterized in that Each of the heat exchange pipe sections includes a plurality of the second heat exchange pipes arranged in parallel, and the number of the second heat exchange pipes in each of the heat exchange pipe sections is the same.

6. The heat exchanger according to claim 1, characterized in that The two water boxes are arranged relative to each other along a first direction, and the second heat exchange pipeline constructs at least one heat exchange layer opposite to the main heat exchange component in a second direction. The heat exchange layer includes a plurality of the second heat exchange tubes arranged relative to each other along a third direction, and the first direction, the second direction and the third direction intersect each other.

7. The heat exchanger according to claim 6, characterized in that The distance between two adjacent second heat exchange tubes in the same heat exchange layer is not less than 2 mm and not more than 4 mm.

8. The heat exchanger according to claim 1, characterized in that The outer diameter of the second heat exchange tube is not less than 5 mm and not more than 10 mm.

9. The heat exchanger according to claim 1, characterized in that: The main heat exchange component further includes a fin group, and the fin group is arranged through the first heat exchange pipeline; And / or, 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.

10. The heat exchanger according to any one of claims 1 to 9, characterized in that: The heat exchanger also includes two end plates arranged opposite to each other, the main heat exchange component is installed between the two end plates, each end plate includes an outer plate body and an inner plate body, and the outer plate body and the inner plate body of each end plate are enclosed to form a water box.

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 main heat exchange component away from the condensing heat exchange component.

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