Heat exchanger and water heater

Abstract

The heat exchanger comprises a water inlet pipe, a water outlet pipe, a bypass pipe and a plurality of heat exchange pipes, the plurality of heat exchange pipes are communicated between the water inlet pipe and the water outlet pipe, the plurality of heat exchange pipes comprise a first heat exchange pipe and a second heat exchange pipe which are communicated with each other, and the water inlet end of the first heat exchange pipe is connected with the water inlet pipe. The water outlet end of the second heat exchange pipe is connected with the water outlet pipe; the pipe diameter of the second heat exchange pipe is larger than that of the first heat exchange pipe; one end of the bypass pipe communicates with the water inlet pipe, and the other end of the bypass pipe communicates with the water inlet end of the second heat exchange pipe. According to the technical scheme, the water cut-off temperature rise of the water heater can be 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] Gas water heaters and other gas water heating equipment include core components such as burners and heat exchangers. The gas burns in the burner to release energy and produce a large amount of high-temperature flue gas. When the high-temperature flue gas flows through the heat exchanger, it heats the cold water to obtain domestic hot water for people to use. However, the existing gas water heaters generally have the problem of temperature rise when the water supply is stopped. The reason for the temperature rise when the water supply is stopped is that after the water heater is suspended, the hot water retained in the water heater will continue to absorb the waste heat from the water heater shell and the heat exchange fins and continue to heat up, causing the water temperature to exceed the set temperature. When the user uses the water for the second time in a short period of time, this part of the retained high-temperature hot water will flow out first, causing the user to feel uncomfortable when using it, and when the temperature is too high, it is easy to cause burns. This affects the user's comfort and safety experience. Utility Model Content

[0003] The main purpose of the utility model is to provide a heat exchanger, aiming at reducing the temperature rise when water is cut off.

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

[0005] Water inlet pipe;

[0006] Outlet pipe;

[0007] a plurality of heat exchange tubes connected between the water inlet tube and the water outlet tube, the plurality of heat exchange tubes comprising a first heat exchange tube and a second heat exchange tube connected to each other, the water inlet end of the first heat exchange tube being connected to the water inlet tube, and the water outlet end of the second heat exchange tube being connected to the water outlet tube; wherein the diameter of the second heat exchange tube is larger than the diameter of the first heat exchange tube; and

[0008] A bypass pipe, one end of which is connected to the water inlet pipe, and the other end of which is connected to the water inlet end of the second heat exchange tube.

[0009] In one embodiment, the number of the heat exchange tubes is an odd number, and the plurality of heat exchange tubes are arranged side by side along the first direction and connected in series.

[0010] In one embodiment, the heat exchanger further includes a first mounting plate and a second mounting plate arranged opposite to each other along a second direction, the plurality of heat exchange tubes are arranged between the first mounting plate and the second mounting plate, the first mounting plate and the second mounting plate are correspondingly provided with mounting holes for passing through both ends of each of the heat exchange tubes, wherein the second direction intersects with the first direction.

[0011] In one embodiment, the water inlet pipe is arranged adjacent to the first mounting plate, and a connecting pipe is provided on the outer side of the first mounting plate. The water outlet end of the first heat exchange tube is connected to the water inlet end of the second heat exchange tube through the connecting pipe, and the bypass pipe is connected to the connecting pipe at one end away from the water inlet pipe, and the bypass pipe is connected to the water inlet end of the second heat exchange tube via the connecting pipe.

[0012] In one embodiment, at least two first heat exchange tubes are arranged side by side along the first direction, and the first heat exchange tube connected to the water inlet pipe is the upstream heat exchange tube, which is located in the middle of the heat exchanger along the first direction.

[0013] In one embodiment, the most upstream heat exchange tube is located at the middle position of the plurality of heat exchange tubes;

[0014] And / or, the most upstream heat exchange tube is arranged adjacent to the second heat exchange tube.

[0015] In one embodiment, the diameter of the bypass pipe is smaller than the diameter of the water inlet pipe;

[0016] And / or, the diameter of the bypass pipe is smaller than the diameter of the heat exchange pipe.

[0017] In one embodiment, the heat exchanger further includes a plurality of fins, each of the fins having a first heat exchange hole for the first heat exchange tube to pass through and a second heat exchange hole for the second heat exchange tube to pass through, the first heat exchange tube passes through the first heat exchange hole and is connected to the fin, and the second heat exchange tube passes through the second heat exchange hole and is connected to the fin.

[0018] In one embodiment, the fin includes a first heat exchange part and a second heat exchange part, the first heat exchange part is sleeved on the periphery of the first heat exchange tube, the second heat exchange part is sleeved on the periphery of the second heat exchange tube, and the heat exchange area of ​​the first heat exchange part is larger than the heat exchange area of ​​the second heat exchange part.

[0019] In addition, to achieve the above-mentioned purpose, the utility model also provides a water heater, including the heat exchanger as described above.

[0020] The heat exchanger of the technical solution of the utility model comprises an inlet pipe, an outlet pipe, a bypass pipe and a plurality of heat exchange pipes, and the plurality of heat exchange pipes are connected between the inlet pipe and the outlet pipe, the plurality of heat exchange pipes comprise a first heat exchange pipe and a second heat exchange pipe which are connected to each other, the inlet end of the first heat exchange pipe is connected to the inlet pipe, the outlet end of the second heat exchange pipe is connected to the outlet pipe, the diameter of the second heat exchange pipe is larger than the diameter of the first heat exchange pipe; one end of the bypass pipe is connected to the inlet pipe, and the other end of the bypass pipe is connected to the inlet end of the second heat exchange pipe, so that the water inlet of the inlet pipe can be diverted, thereby realizing the bypass water mixing function and reducing the temperature rise when the water is stopped. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0022] Figure 1 This is a schematic structural diagram of an embodiment of a heat exchanger of the utility model;

[0023] Figure 2 It is a structural schematic diagram of another embodiment of the heat exchanger of the utility model;

[0024] Figure 3 This is a schematic structural diagram of another embodiment of the heat exchanger of the utility model.

[0025] Description of Figure Numbers:

[0026] Label name Label name 10 Heat Exchanger 14 Bypass pipe 11 Water inlet pipe 15 Connecting pipe 12 Outlet pipe 16 Fins 13 Heat exchange tube 17 First mounting plate 131 The first heat exchange tube 18 Second mounting plate 132 The second heat exchange tube

[0027] 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

[0028] 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.

[0029] 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.

[0030] 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.

[0031] Gas water heaters and other gas water heating equipment include core components such as burners and heat exchangers. The gas burns in the burner to release energy and produce a large amount of high-temperature flue gas. When the high-temperature flue gas flows through the heat exchanger, it heats the cold water to obtain domestic hot water for people to use. However, the existing gas water heaters generally have the problem of temperature rise when the water supply is stopped. The reason for the temperature rise when the water supply is stopped is that after the water heater is suspended, the hot water retained in the water heater will continue to absorb the waste heat from the water heater shell and the heat exchange fins and continue to heat up, causing the water temperature to exceed the set temperature. When the user uses the water for the second time in a short period of time, this part of the retained high-temperature hot water will flow out first, causing the user to feel uncomfortable when using it, and when the temperature is too high, it is easy to cause burns. This affects the user's comfort and safety experience.

[0032] In order to improve the above problems, the present invention proposes a heat exchanger 10, which aims to reduce the temperature rise when the water supply is cut off.

[0033] Reference Figure 1 and Figure 2 In one embodiment of the present utility model, the heat exchanger 10 comprises:

[0034] Water inlet pipe 11;

[0035] Water outlet pipe 12;

[0036] a plurality of heat exchange tubes 13 connected between the water inlet tube 11 and the water outlet tube 12, the plurality of heat exchange tubes 13 including a first heat exchange tube 131 and a second heat exchange tube 132 connected to each other, the water inlet end of the first heat exchange tube 131 being connected to the water inlet tube 11, and the water outlet end of the second heat exchange tube 132 being connected to the water outlet tube 12; wherein the diameter of the second heat exchange tube 132 is larger than the diameter of the first heat exchange tube 131; and

[0037] A bypass pipe 14 , one end of which is communicated with the water inlet pipe 11 , and the other end of which is communicated with the water inlet end of the second heat exchange pipe 132 .

[0038] It is understandable that the heat exchanger 10 proposed in the present application is also called a heat exchanger, and the heat exchanger 10 can be but is not limited to a copper heat exchanger 10. For example, in some embodiments, the heat exchanger 10 can also be a stainless steel heat exchanger 10. The heat exchanger 10 can be used in gas equipment for heat exchange. The gas equipment is not limited to a specific equipment, and it can be a gas water heater, a gas furnace, or a gas wall-mounted boiler, etc. The following is an example of a gas water heater.

[0039] Optionally, the gas water heater may include but is not limited to a box, a combustion chamber, a fan assembly and a heat exchanger 10. A combustion chamber is formed in the box, and the burner, the combustion chamber, the heat exchanger 10 and the fan assembly are arranged in sequence along the direction of flue gas flow. The burner plays the role of ignition and combustion. The combustion chamber formed in the box provides a combustion space for the combustion of gas and air, and the high-temperature flue gas generated after the mixed combustion of gas and air flows upward to the heat exchanger 10 to heat the water pipe in the heat exchanger 10, thereby realizing the heat exchange function of the gas water heater. The fan assembly plays the role of driving the gas and air into the combustion chamber for combustion and transporting the high-temperature flue gas after combustion to the heat exchanger 10 for heat exchange, and then discharging the exhaust gas after heat exchange. The following mainly describes in detail the specific implementation of the assembly structure of the heat exchanger 10.

[0040] In this embodiment, the heat exchanger 10 includes but is not limited to an inlet pipe 11, an outlet pipe 12, a bypass pipe 14 and a plurality of heat exchange pipes 13. The inlet pipe 11 and the outlet pipe 12 are respectively arranged on two sides of the plurality of heat exchange pipes 13 that are arranged opposite to each other in the length direction. Optionally, the diameter and length of the inlet pipe 11 and the outlet pipe 12 are not particularly limited here, and are specifically limited according to the requirements of water inlet and water outlet. The plurality of heat exchange pipes 13 are connected between the inlet pipe 11 and the outlet pipe 12, and the plurality of heat exchange pipes 13 include a first heat exchange pipe 131 and a second heat exchange pipe 132 that are connected to each other.

[0041] Optionally, the number of the first heat exchange tube 131 and the second heat exchange tube 132 is generally not particularly limited. The following is an example in which two first heat exchange tubes 131 are provided and one second heat exchange tube 132 is provided. Specifically, the two first heat exchange tubes 131 are connected to each other, the water inlet end of one heat exchange tube 13 of the two first heat exchange tubes 131 is connected to the water outlet end of the water inlet pipe 11, the water outlet end of the other first heat exchange tube 131 of the two first heat exchange tubes 131 is connected to the water inlet end of the second heat exchange tube 132, and the water outlet end of the second heat exchange tube 132 is connected to the water inlet end of the water outlet pipe 12, wherein the first heat exchange tube 131 connected to the water inlet pipe 11 is the most upstream heat exchange tube 13, and the second heat exchange tube 132 connected to the water outlet pipe 12 is the most downstream heat exchange tube 13. One end of the bypass pipe 14 is connected to the water inlet pipe 11, and the other end of the bypass pipe 14 is connected to the most downstream heat exchange tube 13.

[0042] Through the above-mentioned structural setting, not only the water flow rate of the most upstream heat exchange tube 13 can be reduced and the water temperature of the most upstream heat exchange tube 13 can be increased, but also the water flow rate of the most downstream heat exchange tube 13 can be increased and the water temperature of the most downstream heat exchange tube 13 can be reduced, so as to avoid the water temperature of the most downstream heat exchange tube 13 increasing too quickly and causing the water temperature to be too high, thereby avoiding the user from using high-temperature hot water out of the water outlet pipe 12 for the second time in a short period of time, thereby improving the user's comfort and safety experience, and further improving the problem of temperature rise when the gas water heater is shut off. In addition, since the diameters of the two first heat exchange tubes 131 are smaller than the diameter of the second heat exchange tube 132, the water flow rate of the most downstream heat exchange tube 13 can be further increased, the water temperature of the most downstream heat exchange tube 13 can be reduced, and the temperature rise of the water heater when the water is shut off can also be reduced, thereby improving the user's comfort and safety experience.

[0043] In addition, since the water inlet pipe 11 and the water outlet pipe 12 are respectively arranged on the two sides of the multiple heat exchange tubes 13 that are relatively arranged in the length direction, it can be known that the water inlet pipe 11 and the water outlet pipe 12 are arranged on different sides, so the two ends of the bypass pipe 14 are respectively installed on the water inlet pipe 11 and the second heat exchange tube 132 connected to the water outlet pipe 12, that is, the bypass pipe 14 is installed on the same side of the water inlet pipe 11 and the second heat exchange tube 132 in the length direction. In this way, the length of the bypass pipe 14 itself can be shortened, the volume of the bypass pipe 14 can be reduced, and the volume of the heat exchanger 10 can be reduced.

[0044] The heat exchanger 10 of the technical solution of the utility model comprises an inlet pipe 11, an outlet pipe 12, a bypass pipe 14 and a plurality of heat exchange pipes 13, wherein the plurality of heat exchange pipes 13 are connected between the inlet pipe 11 and the outlet pipe 12, the plurality of heat exchange pipes 13 comprise a first heat exchange pipe 131 and a second heat exchange pipe 132 which are connected to each other, the inlet end of the first heat exchange pipe 131 being connected to the inlet pipe 11, the outlet end of the second heat exchange pipe 132 being connected to the outlet pipe 12, and the second heat exchange pipe 131 and the outlet end of the second heat exchange pipe 132 being connected to the outlet pipe 12. The diameter of the bypass pipe 14 is larger than the diameter of the first heat exchange pipe 131; one end of the bypass pipe 14 is connected to the water inlet pipe 11, and the other end of the bypass pipe 14 is connected to the water inlet end of the second heat exchange pipe 132, so that the water inlet of the water inlet pipe 11 can be diverted to realize the bypass mixing water function and reduce the water outage temperature rise. At the same time, because the two ends of the bypass pipe 14 are respectively installed on the water inlet pipe 11 and the second heat exchange pipe 132, the length of the bypass pipe 14 itself can be shortened and the volume of the heat exchanger 10 can be reduced.

[0045] Reference Figure 2 and Figure 3 In one embodiment of the utility model, the number of the heat exchange tubes 13 is an odd number, and the plurality of heat exchange tubes 13 are arranged side by side along the first direction and connected in series.

[0046] Optionally, the total number of the plurality of heat exchange tubes 13 is an odd number. For example, when there are three of the plurality of heat exchange tubes 13, two or one of the first heat exchange tubes 131 may be provided, and one or two of the corresponding second heat exchange tubes 132 may be provided. For another example, when there are five of the plurality of heat exchange tubes 13, one, two, three or four of the first heat exchange tubes 131 may be provided, and four, three, two or one of the corresponding second heat exchange tubes 132 may be provided. It can be seen that when the total number of the plurality of heat exchange tubes 13 is another odd number, the number combination of the first heat exchange tube 131 and the second heat exchange tube 132 is similar to the above number combination, and will not be listed one by one here. The following is an example in which two of the first heat exchange tubes 131 and one of the second heat exchange tubes 132 are provided.

[0047] In this embodiment, the arrangement of the two first heat exchange tubes 131 and the one second heat exchange tube 132 can be: the two first heat exchange tubes 131 and the one second heat exchange tube 132 are arranged side by side along the first direction, and the two first heat exchange tubes 131 are arranged side by side and adjacent to each other along the first direction; or, the two first heat exchange tubes 131 and the one second heat exchange tube 132 are arranged side by side along the first direction, and the two first heat exchange tubes 131 are arranged with one second heat exchange tube 132 between them. Wherein, the first direction intersects with the length direction of the heat exchange tube 13. Moreover, the two first heat exchange tubes 131 are interconnected, the water inlet end of one of the two first heat exchange tubes 131 is connected to the water outlet end of the water inlet pipe 11, the water outlet end of the other of the two first heat exchange tubes 131 is connected to the water inlet end of the second heat exchange tube 132, and the water outlet end of the second heat exchange tube 132 is connected to the water inlet end of the water outlet pipe 12. By limiting the number and arrangement of the heat exchange tubes 13, the water inlet pipe 11 and the water outlet pipe 12 can always be arranged on both sides of the multiple heat exchange tubes 13 that are relatively arranged, thereby shortening the connection distance between the water inlet pipe 11 and the second heat exchange tube 132, thereby shortening the length of the bypass pipe 14, reducing the volume occupied by the bypass pipe 14, and thus reducing the volume of the heat exchanger 10.

[0048] Reference Figure 2 and Figure 3 In one embodiment of the utility model, the heat exchanger further includes a first mounting plate 17 and a second mounting plate 18 arranged opposite to each other along a second direction, the plurality of heat exchange tubes 13 are arranged between the first mounting plate 17 and the second mounting plate 18, the first mounting plate 17 and the second mounting plate 18 are respectively provided with mounting holes for passing through both ends of each of the heat exchange tubes 13, wherein the second direction intersects with the first direction.

[0049] In this embodiment, the heat exchanger further includes a first mounting plate 17 and a second mounting plate 18. The first mounting plate 17 and the second mounting plate 18 are arranged opposite to each other along a second direction, wherein the second direction intersects with the first direction, and the second direction is specifically the length direction of the heat exchange tube 13. It can be seen from the above embodiment that the gas water heater includes a box body, and the box body has a first side plate and a second side plate arranged opposite to each other in the width direction. The first mounting plate 17 of this embodiment is used to be installed on the top of the first side plate, and the second side plate is used to be installed on the top of the second side plate. In this arrangement, a certain installation space is formed between the first mounting plate 17 and the second mounting plate 18 to accommodate multiple heat exchange tubes 13, specifically, multiple heat exchange tubes 13 are arranged between the first mounting plate 17 and the second mounting plate 18.

[0050] Based on the above content, in order to improve the convenience of installing multiple heat exchange tubes 13 on the first mounting plate 17 and the second mounting plate 18, in this embodiment, the first mounting plate 17 and the second mounting plate 18 are correspondingly provided with mounting holes for each end of each heat exchange tube 13 to pass through, wherein the aperture of the mounting hole is adapted for installation according to the diameter of the heat exchange tube 13, and no special restrictions are made here.

[0051] Reference Figure 2 and Figure 3 In one embodiment of the utility model, the water inlet pipe 11 is arranged adjacent to the first mounting plate 17, and a connecting pipe 15 is provided on the outer side of the first mounting plate 17. The water outlet end of the first heat exchange tube 131 is connected to the water inlet end of the second heat exchange tube 132 through the connecting pipe 15, and the bypass pipe 14 is connected to the connecting pipe 15 at one end away from the water inlet pipe 11, and the bypass pipe 14 is connected to the water inlet end of the second heat exchange tube 132 via the connecting pipe 15.

[0052] In this embodiment, the water inlet pipe 11 is arranged adjacent to the first mounting plate 17 relative to the water outlet pipe 12, and a connecting pipe 15 is arranged on the outer side of the first mounting plate 17. The connecting pipe 15 is implemented by a curved connecting pipe 15. Based on the above embodiment, the multiple heat exchange tubes 13 of this embodiment include two first heat exchange tubes 131 and one second heat exchange tube 132, the two first heat exchange tubes 131 are connected through the connecting pipe 15, the water inlet end of one of the two first heat exchange tubes 131 is connected to the water outlet end of the water inlet pipe 11, and the water outlet end of the other of the two first heat exchange tubes 131 is connected to the water inlet end of the second heat exchange tube 132 through the connecting pipe 15. On the basis of this structure, the end of the bypass pipe 14 away from the water inlet pipe 11 is installed on the connecting pipe 15 connected to the second heat exchange tube 132, and is connected to the water inlet end of the second heat exchange tube 132 through the connecting pipe 15. It can be seen that this embodiment mainly shortens the connection distance between the water inlet pipe 11 and the second heat exchange pipe 132 through the connecting pipe 15, that is, shortens the length of the bypass pipe 14, reduces the volume occupied by the bypass pipe 14, and thus reduces the volume of the heat exchanger 10.

[0053] Reference Figure 2 and Figure 3 In one embodiment of the utility model, at least two first heat exchange tubes 131 are arranged side by side along the first direction, and the first heat exchange tube 131 connected to the water inlet pipe 11 is the upstream heat exchange tube 13, and the upstream heat exchange tube 13 is located in the middle position of the heat exchanger along the first direction.

[0054] Based on the above embodiment, the number of the multiple heat exchange tubes 13 of this embodiment is an odd number, and at least two first heat exchange tubes 131 are provided. For example, when the number of the multiple heat exchange tubes 13 is three, two first heat exchange tubes 131 are provided, and one second heat exchange tube 132 is provided. The first heat exchange tube 131 connected to the water inlet pipe 11 among the two first heat exchange tubes 131 is the most upstream heat exchange tube 13, and the most upstream heat exchange tube 13 is located in the middle of the heat exchanger along the first direction. That is, two first heat exchange tubes 131 and one second heat exchange tube 132 are arranged side by side along the first direction, and the two first heat exchange tubes 131 are arranged adjacent to each other, and the most upstream heat exchange tube 13 is the first heat exchange tube 131 located in the middle. For another example, when the number of the multiple heat exchange tubes 13 is five, two, three or four first heat exchange tubes 131 can be provided, and three, two or one corresponding second heat exchange tubes 132 can be provided. Taking the example that four first heat exchange tubes 131 are provided and one second heat exchange tube 132 is provided, the first heat exchange tube 131 connected to the water inlet pipe 11 among the four first heat exchange tubes 131 is the most upstream heat exchange tube 13, and the most upstream heat exchange tube 13 is located in the middle of the heat exchanger along the first direction. That is, the four first heat exchange tubes 131 and the one second heat exchange tube 132 are arranged side by side along the first direction, and the four first heat exchange tubes 131 are arranged adjacent to each other, and the most upstream heat exchange tube 13 is any one of the three first heat exchange tubes 131 located in the middle.

[0055] This is because when the gas water heater is burning, the temperature of the middle position of the heat exchanger along the first direction is high, and the temperature of the two side positions along the first direction is low. Therefore, the middle position of the heat exchanger along the first direction is set as the upstream heat exchange tube 13, so that when the inlet water of the water inlet pipe 11 enters the upstream heat exchange tube 13, the internal temperature of the upstream heat exchange tube 13 is reduced, the heat exchange temperature rise of the upstream heat exchange tube 13 is increased, and the heat exchange efficiency of the heat exchanger 10 is improved.

[0056] Reference Figure 2 and Figure 3 In one embodiment of the present utility model, the most upstream heat exchange tube 13 is located at the middle position among the plurality of heat exchange tubes 13 .

[0057] Based on the above embodiment, the multiple heat exchange tubes 13 of this embodiment include two first heat exchange tubes 131 and one second heat exchange tube 132. The two first heat exchange tubes 131 and the one second heat exchange tube 132 are arranged side by side along the first direction, and the two first heat exchange tubes 131 are arranged side by side and adjacent to each other along the first direction; the two first heat exchange tubes 131 are connected to each other, the water inlet end of one of the two first heat exchange tubes 131 is connected to the water outlet end of the water inlet pipe 11, the water outlet end of the other of the two first heat exchange tubes 131 is connected to the water inlet end of the second heat exchange tube 132, and the water outlet end of the second heat exchange tube 132 is connected to the water inlet end of the water outlet pipe 12. Among them, the first heat exchange tube 131 connected to the water inlet pipe 11 is the most upstream heat exchange tube 13, and the second heat exchange tube 132 connected to the water outlet pipe 12 is the most downstream heat exchange tube 13. The most upstream heat exchange tube 13 is the middle heat exchange tube 13 among the three heat exchange tubes 13, that is, the most upstream heat exchange tube 13 is the first heat exchange tube 131 adjacent to the second heat exchange tube 132 among the two first heat exchange tubes 131, so that when the inlet water of the water inlet pipe 11 enters the most upstream heat exchange tube 13, the internal temperature of the most upstream heat exchange tube 13 is reduced, the heat exchange temperature rise of the most upstream heat exchange tube 13 is increased, and the heat exchange efficiency of the heat exchanger 10 is improved.

[0058] Reference Figure 2 and Figure 3 In one embodiment of the present utility model, the most upstream heat exchange tube 13 is arranged adjacent to the second heat exchange tube 132 .

[0059] Based on the above embodiments, since the most upstream heat exchange tube 13 is the first heat exchange tube 131 connected to the water inlet pipe 11, the present embodiment arranges the most upstream heat exchange tube 13 adjacent to the second heat exchange tube 132, which can shorten the connection distance between the water inlet pipe 11 and the second heat exchange tube 132, that is, shorten the length of the bypass pipe 14, reduce the volume occupied by the bypass pipe 14, and thus reduce the volume of the heat exchanger 10.

[0060] Reference Figure 2 and Figure 3 In one embodiment of the utility model, the diameter of the bypass pipe 14 is smaller than the diameter of the water inlet pipe 11, thereby reducing the volume occupied by the bypass pipe 14 in the gas water heater and improving the convenience of its installation. Optionally, the diameters of the bypass pipe 14 and the water inlet pipe 11 are not particularly limited.

[0061] Reference Figure 2 and Figure 3In one embodiment of the utility model, the diameter of the bypass pipe 14 is smaller than the diameter of the heat exchange pipe 13, that is, the diameter of the bypass pipe 14 is smaller than the diameter of the first heat exchange pipe 131 and the second heat exchange pipe 132, thereby reducing the volume occupied by the bypass pipe 14 in the gas water heater and improving the convenience of its installation. Optionally, the diameters of the bypass pipe 14, the first heat exchange pipe 131 and the second heat exchange pipe 132 are not particularly limited here.

[0062] Reference Figure 2 and Figure 3 In one embodiment of the utility model, the heat exchanger further includes a plurality of fins 16, each of the fins 16 having a first heat exchange hole for the first heat exchange tube 131 to pass through and a second heat exchange hole for the second heat exchange tube 132 to pass through, the first heat exchange tube 131 passes through the first heat exchange hole and is connected to the fin 16, and the second heat exchange tube 132 passes through the second heat exchange hole and is connected to the fin 16.

[0063] In this embodiment, each fin 16 has a first heat exchange hole for two first heat exchange tubes 131 to pass through and a second heat exchange hole for one second heat exchange tube 132 to pass through. The two first heat exchange tubes 131 pass through the first heat exchange holes corresponding to each fin 16 respectively and are connected to each fin 16. One first heat exchange tube 131 passes through the second heat exchange hole corresponding to each fin 16 and is connected to each fin 16. During the combustion process of the gas water heater, when the high-temperature flue gas generated in the combustion chamber flows upward, it needs to contact with multiple fins 16 before it can continue to flow upward, and cannot directly flow across multiple heat exchange tubes 13 to the fan assembly, thereby ensuring the heat exchange capacity of the heat exchanger 10.

[0064] Optionally, two first heat exchange tubes 131 pass through the first heat exchange holes corresponding to each fin 16, and are welded to each fin 16 at the first heat exchange holes. One second heat exchange tube 132 passes through the second heat exchange holes corresponding to each fin 16, and is welded to each fin 16 at the second heat exchange holes. By welding, the stability of the multiple fins 16 installed on the heat exchange tube 13 is improved.

[0065] Reference Figure 2 and Figure 3 In one embodiment of the utility model, the fin 16 includes a first heat exchange part and a second heat exchange part, the first heat exchange part is sleeved on the outer periphery of the first heat exchange tube 131, the second heat exchange part is sleeved on the outer periphery of the second heat exchange tube 132, and the heat exchange area of ​​the first heat exchange part is larger than the heat exchange area of ​​the second heat exchange part.

[0066] In this embodiment, each fin 16 includes two first heat exchange parts and one second heat exchange part, the two first heat exchange parts are respectively sleeved on the periphery of two first heat exchange tubes 131, and one second heat exchange tube 132 is sleeved on the periphery of one second heat exchange tube 132. The heat exchange areas of the two first heat exchange parts are the same, and the heat exchange area of ​​the first heat exchange part is larger than the heat exchange area of ​​the second heat exchange part. Such a configuration can make more smoke in the combustion chamber gather toward the part close to the two first heat exchange tubes 131, increase the water temperature of the two first heat exchange tubes 131, and reduce the water temperature of the second heat exchange tube 132, so as to avoid the water temperature of the second heat exchange tube 132 from increasing too fast and causing the water temperature to be too high, thereby avoiding the user from using high-temperature hot water out of the water outlet pipe 12 for the second time in a short period of time, improving the user's comfort and safety experience, and thus improving the problem of temperature rise when the gas water heater is shut off.

[0067] The utility model also proposes a water heater, which includes a heat exchanger 10. The specific structure of the heat exchanger 10 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.

[0068] The above description is only a preferred 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 inventive 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: Water inlet pipe; Outlet pipe; A plurality of heat exchange tubes are connected between the water inlet tube and the water outlet tube, the plurality of heat exchange tubes include a first heat exchange tube and a second heat exchange tube that are connected to each other, the water inlet end of the first heat exchange tube is connected to the water inlet tube, and the water outlet end of the second heat exchange tube is connected to the water outlet tube; wherein the diameter of the second heat exchange tube is larger than the diameter of the first heat exchange tube; as well as A bypass pipe, one end of which is connected to the water inlet pipe, and the other end of which is connected to the water inlet end of the second heat exchange tube.

2. The heat exchanger according to claim 1, characterized in that The number of the heat exchange tubes is an odd number, and the plurality of heat exchange tubes are arranged side by side along a first direction and are connected in series.

3. The heat exchanger according to claim 2, characterized in that The heat exchanger also includes a first mounting plate and a second mounting plate arranged opposite to each other along a second direction, the plurality of heat exchange tubes are arranged between the first mounting plate and the second mounting plate, the first mounting plate and the second mounting plate are correspondingly provided with mounting holes for passing through both ends of each of the heat exchange tubes, wherein the second direction intersects with the first direction.

4. The heat exchanger according to claim 3, characterized in that The water inlet pipe is arranged adjacent to the first mounting plate, and a connecting pipe is provided on the outer side of the first mounting plate. The water outlet end of the first heat exchange tube is connected with the water inlet end of the second heat exchange tube through the connecting pipe, and the bypass pipe is connected to the connecting pipe at one end away from the water inlet pipe, and the bypass pipe is connected with the water inlet end of the second heat exchange tube via the connecting pipe.

5. The heat exchanger according to claim 2, characterized in that At least two first heat exchange tubes are arranged side by side along the first direction, and the first heat exchange tube connected to the water inlet pipe is the most upstream heat exchange tube, which is located in the middle of the heat exchanger along the first direction.

6. The heat exchanger according to claim 5, characterized in that The most upstream heat exchange tube is located at the middle position among the plurality of heat exchange tubes; And / or, the most upstream heat exchange tube is arranged adjacent to the second heat exchange tube.

7. The heat exchanger according to claim 1, characterized in that The diameter of the bypass pipe is smaller than the diameter of the water inlet pipe; And / or, the diameter of the bypass pipe is smaller than the diameter of the heat exchange pipe.

8. The heat exchanger according to any one of claims 1 to 7, characterized in that: The heat exchanger also includes a plurality of fins, each of the fins having a first heat exchange hole for the first heat exchange tube to pass through and a second heat exchange hole for the second heat exchange tube to pass through, the first heat exchange tube passes through the first heat exchange hole and is connected to the fin, and the second heat exchange tube passes through the second heat exchange hole and is connected to the fin.

9. The heat exchanger according to claim 8, characterized in that The fin includes a first heat exchange part and a second heat exchange part, the first heat exchange part is sleeved on the periphery of the first heat exchange tube, the second heat exchange part is sleeved on the periphery of the second heat exchange tube, and the heat exchange area of ​​the first heat exchange part is larger than the heat exchange area of ​​the second heat exchange part.

10. A water heater, characterized in that: Comprising a heat exchanger as claimed in any one of claims 1 to 9.

Images