Heat exchanger and gas water heater

Abstract

The utility model discloses a heat exchanger and a gas water heater, and relates to the technical field of water heaters. The heat exchanger comprises a first heat exchange assembly and a second heat exchange assembly which are sequentially arranged on a flue gas flowing path. The first heat exchange assembly comprises a plurality of first heat exchange pipes arranged side by side and first fin sets arranged on the peripheries of the first heat exchange pipes. The second heat exchange assembly comprises a plurality of second heat exchange pipes arranged side by side and second fin sets arranged on the peripheries of the second heat exchange pipes. A flow path of the second heat exchange assembly is connected with a flow path of the first heat exchange assembly in series. In the flue gas flowing direction, the height H1 of the first fin group protruding out of the outer surface of the first heat exchange tube and the height H2 of the second fin group protruding out of the outer surface of the second heat exchange tube meet the following formula: H1lt; h2. According to the technical scheme, the problem of water cut-off temperature rise of the gas water heater can be effectively solved, and meanwhile condensate water can be prevented from being generated.

Description

Technical Field

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

[0002] A gas water heater refers to a gas device that uses gas as fuel and transfers heat to cold water flowing through a heat exchanger through combustion heating to prepare hot water.

[0003] In related technologies, when the water heater runs for a period of time and then the water is turned off and then turned on again, the outlet water temperature will be too high and may even scald users, and there is a problem of high stop water temperature rise. Summary of the Utility Model

[0004] The main object of the utility model is to propose a heat exchanger, aiming to improve the problem of stop water temperature rise of the gas water heater.

[0005] To achieve the above object, the heat exchanger proposed by the utility model includes a first heat exchange component and a second heat exchange component arranged in sequence on the flue gas flow path;

[0006] The first heat exchange component includes a plurality of first heat exchange tubes arranged side by side and a first fin group arranged on the outer periphery of the first heat exchange tubes;

[0007] The second heat exchange component includes a plurality of second heat exchange tubes arranged side by side and a second fin group arranged on the outer periphery of the second heat exchange tubes; the flow path of the second heat exchange component is connected in series with the flow path of the first heat exchange component;

[0008] In the direction of flue gas flow, the height H1 of the first fin group protruding from the outer surface of the first heat exchange tube and the height H2 of the second fin group protruding from the outer surface of the second heat exchange tube satisfy: H1 < H2.

[0009] In an embodiment of the present application, the height H1 of the first fin group protruding from the outer surface of the first heat exchange tube satisfies: 0.3 mm ≤ H1 ≤ 3 mm.

[0010] In an embodiment of the present application, the height H1 of the first fin group protruding from the outer surface of the first heat exchange tube satisfies: 0.3 mm ≤ H1 ≤ 1.8 mm.

[0011] In an embodiment of the present application, each first heat exchange tube is provided with a first fin group on its outer periphery;

[0012] The first fin groups corresponding to two adjacent first heat exchange tubes are arranged at intervals.

[0013] In an embodiment of the present application, the first fin group and the corresponding first heat exchange tube are of an integral structure.

[0014] In an embodiment of the present application, the first fin group is a threaded structure or a fin structure formed on the outer surface of the first heat exchange tube.

[0015] In an embodiment of the present application, the first fin group and the first heat exchange tube are of a split structure.

[0016] In an embodiment of the present application, in the direction of the flue gas flow, the distance D between the first fin group and the second fin group satisfies: 3 mm ≤ D ≤ 13 mm.

[0017] In an embodiment of the present application, the heat exchanger further includes two end plates, and the first heat exchange assembly and the second heat exchange assembly are installed at intervals between the two end plates;

[0018] A plurality of the first heat exchange tubes are arranged in series, a plurality of the second heat exchange tubes are arranged in series, and the outlet end of the second heat exchange assembly is connected to the inlet end of the first heat exchange assembly.

[0019] To achieve the above object, the present application further provides a gas water heater, including a burner, a blower, a combustion chamber, and the above-mentioned heat exchanger;

[0020] The heat exchanger is arranged above the combustion chamber, and the burner is arranged below the combustion chamber;

[0021] The blower is arranged above the heat exchanger, or the blower is arranged below the burner.

[0022] In the heat exchanger of the technical solution of the present utility model, by arranging the first heat exchange assembly and the second heat exchange assembly in sequence on the flue gas flow path, the first heat exchange assembly includes a plurality of first heat exchange tubes arranged side by side and a first fin group arranged on the outer periphery of the first heat exchange tube, the second heat exchange assembly includes a plurality of second heat exchange tubes arranged side by side and a second fin group arranged on the outer periphery of the second heat exchange tube, and the height H1 of the first fin group protruding from the outer surface of the first heat exchange tube is less than the height H2 of the second fin group protruding from the outer surface of the second heat exchange tube, so that the heat exchange area of the first heat exchange assembly is relatively small, the heat storage amount of the first heat exchange assembly can be reduced, and further the stop water temperature rise of the first heat exchange assembly can be reduced, thereby effectively improving the stop water temperature rise problem of the water heater. In addition, the first heat exchange assembly of this embodiment includes a first heat exchange tube and a first fin group. Compared with the method of only using a smooth tube, it can absorb relatively more heat so that the temperature of the first heat exchange assembly will not be too low, thus effectively avoiding the generation of condensed water. Description of the Drawings

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0024] Figure 1 Structural schematic diagram of an embodiment of the heat exchanger of the present invention;

[0025] Figure 2 Front view and partial enlarged view of the heat exchanger of the present invention;

[0026] Figure 3 Structural schematic diagram of the first heat exchange component in the embodiment of the present invention;

[0027] Figure 4 Schematic diagram of the water flow direction of the heat exchanger of the present invention;

[0028] Figure 5 Structural schematic diagram of an embodiment of the gas water heater of the present invention.

[0029] Explanation of the reference numerals in the drawings:

[0030] Label Name Label Name 100 Heat exchanger 22 Second fin group 1 First heat exchange component 3 End plate 11 First heat exchange tube 200 Combustion chamber 12 First fin group 300 Burner 2 Second heat exchange component 400 Fan 21 Second heat exchange tube 500 Smoke hood

[0031] The realization of the object of the present invention, functional features and advantages will be further described in conjunction with the embodiments with reference to the accompanying drawings. Specific embodiments

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0033] 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 invention, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0034] At the same time, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution where A and B are satisfied simultaneously.

[0035] In addition, if there are descriptions such as "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed 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, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0036] A gas water heater is a device that produces hot water by burning gas and exchanging heat through a heat exchanger.

[0037] In the related art, double-row heat exchange tubes are used to increase the heat exchange efficiency. However, the fins of the double-row heat exchange tubes in the related art usually adopt fins with a relatively high height specification, which will cause the overall heat storage capacity of the heat exchanger to be too large, resulting in a problem of high stop water temperature rise. In order to reduce the stop water temperature rise, in some double-row heat exchange tubes in the related art, one row of heat exchange tubes located on the upstream side of the flue gas path is set as a smooth tube, and the characteristic that the smooth tube absorbs less heat is used to solve the overall stop water temperature rise problem. However, precisely because the smooth tube absorbs less heat, the temperature of the smooth tube is relatively low, and the water vapor in the high-temperature flue gas is likely to condense when it meets the cold.

[0038] For this reason, the present utility model proposes a heat exchanger 100, which is applied to a gas water heater and aims to improve the problem of stop water temperature rise of the gas water heater by setting finned heat exchange tube structures with different heights on the flue gas flow path, and at the same time can effectively prevent the generation of condensed water. It can be understood that, as Figure 5 , the gas water heater includes a combustion chamber 200, a heat exchanger 100, a burner 300, a blower 400, and a smoke hood 500. The combustion chamber 200 penetrates up and down. The heat exchanger 100 is arranged above the combustion chamber 200, and the burner 300 is located below the combustion chamber 200. The burner 300 plays a role in ignition and combustion. The combustion chamber 200 provides a combustion space for the combustion of gas and air. After the gas and air are mixed and burned, the generated high-temperature flue gas flows upward to the heat exchanger 100 to heat the water pipes in the heat exchanger 100. The blower 400 is used to drive gas and air into the combustion chamber 200 for combustion and transport the generated high-temperature flue gas to the heat exchanger 100 for heat exchange, and then discharge the heat-exchanged waste gas from the smoke hood 500. The structure of the heat exchanger 100 will be described below by way of embodiments.

[0039] As Figures 1 to 4As shown, the heat exchanger 100 includes a first heat exchange component 1 and a second heat exchange component 2 arranged in sequence on the flue gas flow path; the first heat exchange component 1 includes a plurality of first heat exchange tubes 11 arranged side by side and a first fin group 12 provided on the outer periphery of the first heat exchange tubes 11; the second heat exchange component 2 includes a plurality of second heat exchange tubes 21 arranged side by side and a second fin group 22 provided on the outer periphery of the second heat exchange tubes 21; the flow path of the second heat exchange component 2 is in series with the flow path of the first heat exchange component 1; in the direction of the flue gas flow, the height H1 of the first fin group 12 protruding from the outer surface of the first heat exchange tubes 11 and the height H2 of the second fin group 22 protruding from the outer surface of the second heat exchange tubes 21 satisfy: H1 < H2.

[0040] In this embodiment, the first heat exchange component 1 and the second heat exchange component 2 are arranged in sequence on the flue gas flow path. It can be understood that the high-temperature flue gas first exchanges heat through the first heat exchange component 1 and then exchanges heat through the second heat exchange component 2 after the temperature is reduced to a certain extent. Taking the flue gas flowing from bottom to top as an example, the second heat exchange component 2 is arranged above the first heat exchange component 1.

[0041] It can be understood that the first heat exchange component 1 is a finned tube heat exchange structure. The first heat exchange component 1 includes a plurality of first heat exchange tubes 11 arranged side by side and a first fin group 12 provided on the outer periphery of the first heat exchange tubes 11. The first fin group 12 can increase the heat exchange area between the first heat exchange component 1 and the flue gas and accelerate the heat exchange efficiency. Specifically, the first fin group 12 includes a plurality of first fins arranged at intervals along the extension direction of the first heat exchange tubes 11, and a gap for the flue gas to pass through is formed between two adjacent first fins. Optionally, the first fin group 12 can be integrally formed with the first heat exchange tubes 11 or can be fixed together after being separately formed. Optionally, the first heat exchange tubes 11 can be round tubes, elliptical tubes or flat tubes, etc.

[0042] It can be understood that the second heat exchange component 2 is a finned tube heat exchange structure. The second heat exchange component 2 includes a plurality of second heat exchange tubes 21 arranged side by side and a second fin group 22 provided on the outer periphery of the second heat exchange tubes 21. The second fin group 22 can increase the heat exchange area between the second heat exchange component 2 and the flue gas and accelerate the heat exchange efficiency. Specifically, the second fin group 22 includes a plurality of second fins arranged at intervals along the extension direction of the second heat exchange tubes 21, and a gap for the flue gas to pass through is formed between two adjacent second fins. Optionally, the second fin group 22 can be integrally formed with the second heat exchange tubes 21 or can be fixed together after being separately formed. Optionally, the second heat exchange tubes 21 can be round tubes, elliptical tubes or flat tubes, etc.

[0043] In this embodiment, by setting the height H1 of the first fin group 12 protruding from the outer surface of the first heat exchange tube 11 to be less than the height H2 of the second fin group 22 protruding from the outer surface of the second heat exchange tube 21, compared with the heat exchange component in the related art where the second fin group 22 has the same height, the heat exchange area of the first heat exchange component 1 in this embodiment is reduced, the heat storage capacity of the first heat exchange component 1 is reduced, so that when the water supply of the water heater is turned off, the temperature rise of the first heat exchange component 1 during shutdown can be reduced, and further the temperature rise of the whole heat exchanger during shutdown can be reduced.

[0044] It should be noted that the first heat exchange component 1 of this embodiment includes a first heat exchange tube 11 and a first fin group 12 arranged outside the first heat exchange tube 11. Compared with the bare tube structure in the related art, it can absorb more heat, so the overall temperature of the first heat exchange component 1 will be higher than the temperature of the bare tube and it is not easy to reach the dew point temperature of water vapor, thus effectively preventing the generation of condensed water. At the same time, precisely because of the absorption of the heat of the high-temperature flue gas by the first heat exchange component 1, the temperature of the flue gas reaching the second heat exchange component 2 can be effectively reduced (for example, the flue gas temperature can be reduced from about 900 °C to about 600 °C). Therefore, the second fins of the second fin group 22 can adopt a thinner fin structure, reducing the overall material of the second heat exchange component 2, thereby reducing costs; correspondingly, with thinner fins for the second fins, more second fins can be arranged on the second heat exchange tube of the same length, increasing the heat exchange area and improving the heat exchange efficiency.

[0045] In actual application, the first heat exchange component 1 and the second heat exchange component 2 can be fixed into an integral structure by two end plates 3, or the first heat exchange component 1 and the second heat exchange component 2 can be two independent heat exchanger structures arranged at intervals, as long as the first heat exchange component 1 and the second heat exchange component 2 can be ensured to be connected in series.

[0046] In summary, in the heat exchanger 100 of the technical solution of the present utility model, by sequentially arranging the first heat exchange component 1 and the second heat exchange component 2 on the flue gas flow path, the first heat exchange component 1 includes a plurality of first heat exchange tubes 11 arranged side by side and a first fin group 12 provided on the outer periphery of the first heat exchange tubes 11, and the second heat exchange component 2 includes a plurality of second heat exchange tubes 21 arranged side by side and a second fin group 22 provided on the outer periphery of the second heat exchange tubes 21. The height H1 of the first fin group 12 protruding from the outer surface of the first heat exchange tubes 11 is less than the height H2 of the second fin group 22 protruding from the outer surface of the second heat exchange tubes 21, so that the heat exchange area of the first heat exchange component 1 is small, the heat storage amount of the first heat exchange component 1 can be reduced, and further the temperature rise of the first heat exchange component 1 when the water stops flowing can be reduced. Thus, the problem of the temperature rise of the water heater when the water stops flowing can be effectively improved. In addition, the first heat exchange component 1 of this embodiment includes the first heat exchange tubes 11 and the first fin group 12. Compared with the method of only using smooth tubes, it can absorb relatively more heat so that the temperature of the first heat exchange component 1 will not be too low, thereby effectively avoiding the generation of condensed water.

[0047] In an embodiment of the present application, as Figure 2 and Figure 3 , the height H1 of the first fin group 12 protruding from the outer surface of the first heat exchange tubes 11 satisfies: 0.3 mm ≤ H1 ≤ 3 mm.

[0048] It can be understood that the height H2 of the second fin group 22 protruding from the outer surface of the second heat exchange tubes 21 in the second heat exchange component 2 can refer to the conventional finned tube heat exchange structure on the market (for example, a smooth tube is inserted through the fin group), and no limitation is made here. The specific dimension of the height H1 of the first fin group 12 protruding from the outer surface of the first heat exchange tubes 11 can be determined according to the actual situation, as long as the height H1 of the first fin group 12 protruding from the outer surface of the first heat exchange tubes 11 is less than H2.

[0049] In actual application, the height H1 of the first fin group 12 protruding from the outer surface of the first heat exchange tubes 11 should not be too small or too large. If it is too small, the processing technology is difficult, and the heat absorbed from the flue gas is too low to achieve a good effect on reducing the temperature rise of the second heat exchange component 2 when the water stops flowing; if it is too large, the heat absorption of the first heat exchange component 1 is too much, which easily leads to the problem of too high temperature rise of the first heat exchange component 1 when the water stops flowing. Based on this, in this embodiment, the height H1 of the first fin group 12 protruding from the outer surface of the first heat exchange tubes 11 is set to satisfy 0.3 mm ≤ H1 ≤ 3 mm, which is convenient for processing and forming while ensuring a good effect of reducing the temperature rise when the water stops flowing.

[0050] In order to achieve a better effect of reducing the temperature rise when the water stops flowing, in an embodiment, the height H1 of the first fin group 12 protruding from the outer surface of the first heat exchange tubes 11 satisfies: 0.3 mm ≤ H1 ≤ 1.8 mm.

[0051] Exemplarily, the height H1 of the first fin group 12 protruding from the outer surface of the first heat exchange tube 11 can be selected as 0.3 mm, 0.5 mm, 0.6 mm, 0.8 mm, 1 mm, 1.1 mm, 1.2 mm, 1.5 mm, 1.6 mm, 1.8 mm, etc. Preferably, the height H1 of the first fin group 12 protruding from the outer surface of the first heat exchange tube 11 is set within 1 mm.

[0052] To further improve the improvement effect on the stop water temperature rise, as Figure 2 and Figure 3 , in an embodiment of the present application, a first fin group 12 is provided on the outer periphery of each first heat exchange tube 11; the first fin groups 12 corresponding to two adjacent first heat exchange tubes 11 are arranged at intervals.

[0053] In this embodiment, each first heat exchange tube 11 corresponds to a separate first fin group 12, so that the first fin groups 12 corresponding to two adjacent first heat exchange tubes 11 are arranged at intervals to form a passage for the flue gas to pass through. With such an arrangement, on the one hand, the heat exchange area of the first fin group 12 can be reduced, and the heat storage amount can be reduced; on the other hand, the resistance to the flue gas can be reduced.

[0054] Specifically, the first fin group 12 includes a plurality of first fins spaced apart along the extending direction of the first heat exchange tube 11, and the first fins are annularly arranged around the periphery of the first heat exchange tube 11. Optionally, the first fin can be a circular ring structure, a rectangular ring structure or a ring structure of other shapes. Such a design can enable each first fin group 12 and the corresponding first heat exchange tube 11 to be independently formed and manufactured, simplifying the process difficulty.

[0055] Optionally, the first fin group 12 and the corresponding first heat exchange tube 11 can be an integral structure, and such an arrangement can simplify the process steps and improve the production efficiency.

[0056] Exemplarily, the first heat exchange tube 11 and the corresponding first fin group 12 in this embodiment are low fin tubes, and the first fin group 12 can be a thread structure or a fin structure formed on the outer surface of the first heat exchange tube 11, and can be manufactured by machining such as turning, rolling, rolling, etc. on the surface of a smooth tube (the first heat exchange tube 11). It can be seen from this that the low fin tube in this embodiment has a larger heat exchange area than the smooth tube under the condition of the same consumption of metal materials.

[0057] In some other embodiments, the first fin group 12 can also be separately manufactured from the corresponding first heat exchange tube 11 and then welded and fixed together.

[0058] In an embodiment of the present application, as Figure 1 , Figure 2 and Figure 4, the heat exchanger 100 further includes two end plates 3, and the first heat exchange component 1 and the second heat exchange component 2 are installed at intervals between the two end plates 3; a plurality of first heat exchange tubes 11 are connected in series, a plurality of second heat exchange tubes 21 are connected in series, and the outlet end of the second heat exchange component 2 is connected to the inlet end of the first heat exchange component 1.

[0059] In this embodiment, the two end plates 3 serve to fixedly install the first heat exchange component 1 and the second heat exchange component 2. Optionally, two rows of mounting holes are respectively provided on the two end plates 3 for the two ends of the plurality of first heat exchange tubes 11 and the two ends of the plurality of second heat exchange tubes 21 to be inserted, and the heat exchange tubes can be fixedly welded to the end plates 3. Optionally, for the convenience of assembly, the parts of the first heat exchange tubes 11 and the second heat exchange tubes 21 cooperating with the end plates 3 are provided as smooth tube sections. Adjacent two first heat exchange tubes 11 can be communicated with each other through a connecting pipe, so that the plurality of first heat exchange tubes 11 in the first heat exchange component 1 are connected end to end to form a series flow path; correspondingly, adjacent two second heat exchange tubes 21 can be communicated with each other through a connecting pipe, so that the plurality of second heat exchange tubes 21 in the second heat exchange component 2 are connected end to end to form a series flow path. By connecting the outlet end of the second heat exchange component 2 to the inlet end of the first heat exchange component 1, the water flow enters from the second heat exchange component 2 and flows out from the first heat exchange component 1, that is, the direction of the water flow is opposite to the flow direction of the flue gas, and the heat exchange efficiency is higher.

[0060] Further, the plurality of first heat exchange tubes 11 and the plurality of second heat exchange tubes 21 are arranged in parallel and staggered.

[0061] With such an arrangement, the gaps between the first heat exchange tube 11 and the adjacent two second heat exchange tubes 21 are in alignment, and the first heat exchange tube 11 can play a role in blocking the flue gas, so as to avoid the area with a relatively high temperature of the second heat exchange component 2 directly facing the flue gas, so that the peak temperature of the second heat exchange component 2 can be reduced, and thus the stop water temperature rise can be effectively reduced.

[0062] In an embodiment of the present application, as Figure 2 , in the direction of the flue gas flow, the distance D between the first fin group 12 and the second fin group 22 satisfies: 3 mm ≤ D ≤ 13 mm.

[0063] It can be understood that the distance D between the first fin group 12 and the second fin group 22 in the direction of the flue gas flow should not be too small or too large. If the distance is too small, the connecting pipes of the first heat exchange tubes 11 and the second heat exchange tubes 21 at the two side end plates 3 are not convenient to install; if the distance is too large, the first heat exchange component 1 may be closer to the flame and is easily burned and deformed; based on this, in this embodiment, the distance D between the first fin group 12 and the second fin group 22 in the direction of the flue gas flow is set to satisfy 3 mm ≤ D ≤ 13 mm, which is convenient for installation and can extend the service life of the first heat exchange component 1.

[0064] In actual application, the distance D between the first fin group 12 and the second fin group 22 in the flue gas flow direction can be selected as 3mm, 3.5mm, 5mm, 6mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 10mm, 11mm, 12mm, 12.5mm or 13mm, etc.

[0065] As an example, taking the number of the first heat exchange tubes 11 as 5, the number of the second heat exchange tubes 21 as 6, and the second heat exchange tubes 21 being arranged in a staggered manner with respect to the first heat exchange tubes 11 as an example, as Figure 1 and Figure 4 , by detecting the outlet temperature of each heat exchange tube, it can be known that when the gas water heater is operating, the inlet temperature of the heat exchanger 100 is 20°C, and when the outlet temperature is set to 60°C, the outlet temperature of each heat exchange tube is as follows:

[0066] Outlet temperature of pipe 1 25℃ Outlet temperature of pipe 7 52℃ Outlet temperature of pipe 2 30℃ Outlet temperature of pipe 8 54℃ Outlet temperature of pipe 3 35℃ Outlet temperature of pipe 9 56℃ Outlet temperature of pipe 4 40℃ Outlet temperature of pipe 10 58℃ Outlet temperature of pipe 5 45℃ Outlet temperature of pipe 11 60℃ Outlet temperature of pipe 6 50℃

[0067] When the gas water heater stops supplying water, the outlet temperature of each heat exchange tube is as follows:

[0068]

[0069]

[0070] As can be seen from the above table, the highest temperature of the water retained in the heat exchanger 100 is the outlet temperature of the 11th heat exchange tube, which is 65°C. Compared with the set temperature of 60°C, the temperature rise is 5°C, which will not have a great impact on the user's water use experience and has better comfort.

[0071] The present utility model also proposes a gas water heater, as Figure 5 , the gas water heater includes a burner 300, a blower 400, a combustion chamber 200 and a heat exchanger 100. The specific structure of the heat exchanger 100 refers to the above embodiments. Since this gas water heater adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0072] Among them, the heat exchanger 100 is arranged above the combustion chamber 200, and the burner 300 is arranged below the combustion chamber 200.

[0073] It can be understood that the type of this gas water heater can be a forced-draft type water heater. At this time, the blower 400 is arranged above the heat exchanger 100, and the air flow is driven by negative pressure suction; or it can also be a blower type water heater. At this time, the blower 400 is arranged below the burner 300, and the air flow is driven by blowing air.

[0074] The above are only the preferred 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 inventive 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 shall be included within the patent protection scope of the present utility model.

Claims

1. A heat exchanger, characterized in that: It includes a first heat exchange component and a second heat exchange component sequentially arranged on a flue gas flow path; The first heat exchange assembly includes a plurality of first heat exchange tubes arranged side by side and a first fin group arranged on the outer periphery of the first heat exchange tubes; The second heat exchange component comprises a plurality of second heat exchange tubes arranged side by side and a second fin group arranged on the outer periphery of the second heat exchange tubes; the flow path of the second heat exchange component is connected in series with the flow path of the first heat exchange component; In the direction of flue gas flow, the height H1 of the first fin group protruding from the outer surface of the first heat exchange tube, and the height H2 of the second fin group protruding from the outer surface of the second heat exchange tube satisfy: H1 <H2。 2. The heat exchanger according to claim 1, characterized in that A height H1 of the first fin group protruding from the outer surface of the first heat exchange tube satisfies: 0.3 mm ≤ H1 ≤ 3 mm.

3. The heat exchanger according to claim 2, characterized in that A height H1 of the first fin group protruding from the outer surface of the first heat exchange tube satisfies: 0.3 mm ≤ H1 ≤ 1.8 mm.

4. The heat exchanger according to any one of claims 1 to 3, characterized in that A first fin group is disposed on the outer periphery of each of the first heat exchange tubes; The first fin groups corresponding to two adjacent first heat exchange tubes are arranged at intervals.

5. The heat exchanger according to claim 4, characterized in that The first fin group and the corresponding first heat exchange tube are an integrated structure.

6. The heat exchanger according to claim 5, characterized in that The first fin group is a thread structure or a fin structure formed on the outer surface of the first heat exchange tube.

7. The heat exchanger according to any one of claims 1 to 3, characterized in that The first fin group and the first heat exchange tube are separate structures.

8. The heat exchanger according to any one of claims 1 to 3, characterized in that In the direction of smoke flow, the distance D between the first fin group and the second fin group satisfies: 3mm≤D≤13mm.

9. The heat exchanger according to any one of claims 1 to 3, characterized in that The heat exchanger further comprises two end plates, and the first heat exchange component and the second heat exchange component are installed between the two end plates at intervals; A plurality of the first heat exchange tubes are arranged in series, a plurality of the second heat exchange tubes are arranged in series, and an outlet end of the second heat exchange component is connected to an inlet end of the first heat exchange component.

10. A gas water heater, characterized in that: comprising a burner, a fan, a combustion chamber and a heat exchanger as claimed in any one of claims 1 to 9; The heat exchanger is arranged above the combustion chamber, and the burner is arranged below the combustion chamber; The fan is arranged above the heat exchanger, or the fan is arranged below the burner.

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