Heat exchanger and gas water heater comprising same

Abstract

The utility model provides a heat exchanger and a gas water heater comprising the same. The heat exchanger comprises a plurality of rows of heat exchange pipes arranged in the flue gas rising direction, and each row of heat exchange pipes comprises a plurality of heat exchange pipes arranged at intervals in the width direction of the heat exchanger. The heat exchanger further comprises a plurality of heat exchange fins arranged on the heat exchange pipes in a sleeving mode, the heat exchange fins are arranged at intervals in the length direction of the heat exchanger, each heat exchange fin comprises a plurality of heat exchange areas in the smoke rising direction, the heat exchange areas correspond to the rows of heat exchange pipes one to one, and the heat exchange areas of the heat exchange areas are sequentially increased in the smoke rising direction. The heat exchange areas of the multiple heat exchange areas are sequentially increased in the smoke rising direction in the heat exchange fins, so that heat exchange distribution of the upstream heat exchange area and the downstream heat exchange area is changed, it is guaranteed that the heat absorption capacity of the different heat exchange areas located on the heat exchange fins is uniform, and condensate water generated on the outer walls of the heat exchange pipes located on the downstream heat exchange area is reduced or avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to a heat exchanger and gas water heater containing it. BACKGROUND

[0002] The existing gas water heater is first through the lower area (upstream area) of heat exchange fin heat exchange and then through the upper area (downstream area) in the flue gas rising direction when small load combustion, and the flue gas temperature of the upper area is low, so that the temperature of the heat exchange tube in the upper area of the heat exchange fin is also low, and the water vapor in the flue gas condenses and adheres to the heat exchange tube in the upper area, when accumulated to a certain extent, the condensed water will drip to the combustion fire row along the fin and the heat exchanger wall, which will cause unstable flame combustion and affect the combustion efficiency.

[0003] For the treatment of condensed water, a condensed water receiving and discharging device is generally provided to discharge it from the machine, but the structure of the condensed water receiving and discharging device is complex and increases the cost, and the condensed water drain pipe is not aesthetic outside the machine, and the generation of condensed water has not been fundamentally solved.

[0004] Therefore, how to reduce or avoid the generation of condensed water on the outer wall of the heat exchange tube in the upper area of the heat exchange fin is a technical problem to be solved in the technical field. SUMMARY

[0005] The utility model solves the technical problem that the condensed water is generated due to the low flue gas temperature of the upper area in the prior art, and provides a heat exchanger and a gas water heater containing the same.

[0006] The utility model solves the above technical problems through the following technical scheme:

[0007] A heat exchanger, characterized in that the heat exchanger comprises a plurality of rows of heat exchange tubes arranged in the flue gas rising direction, each row of heat exchange tubes comprising a plurality of heat exchange tubes arranged at intervals in the width direction of the heat exchanger;

[0008] The heat exchanger further comprises a plurality of heat exchange fins sleeved on the heat exchange tubes, the plurality of heat exchange fins are arranged at intervals in the length direction of the heat exchanger, each heat exchange fin comprises a plurality of heat exchange zones in the flue gas rising direction, the plurality of heat exchange zones correspond one-to-one to the plurality of rows of heat exchange tubes, and the heat exchange area of the plurality of heat exchange zones increases successively in the flue gas rising direction.

[0009] In the technical solution, the heat exchange area of the heat exchange fin in multiple heat exchange zones in the upward direction of the flue gas is sequentially increased, which can change the heat exchange distribution of the upstream heat exchange zone and the downstream heat exchange zone, ensure the uniform heat absorption of different heat exchange zones (opposite upstream heat exchange zone and downstream heat exchange zone) on the heat exchange fin, and increase the flue gas temperature of the heat exchange pipe in the downstream heat exchange zone to reduce or avoid the condensate on the outer wall of the heat exchange pipe in the downstream heat exchange zone. It should be noted that the flue gas temperature of the heat exchange zone upstream in the upward direction of the flue gas is higher, and the heat exchange efficiency is higher. By reducing the heat exchange area of the heat exchange zone upstream, the flue gas temperature after heat exchange of the flue gas passing through the upstream heat exchange zone can be increased, thereby increasing the flue gas temperature reaching the downstream heat exchange zone and increasing the pipe wall temperature of the heat exchange pipe in the downstream heat exchange zone.

[0010] Preferably, the heat exchange fin is provided with a heat exchange hole corresponding to the heat exchange pipe in the thickness direction, and the heat exchange pipe is arranged in the heat exchange hole.

[0011] Preferably, the minimum distance from the outer edge of the heat exchange hole in the heat exchange zone upstream in the upward direction of the flue gas to the outer edge of the heat exchange fin is smaller than the minimum distance from the outer edge of the heat exchange hole in the heat exchange zone downstream to the outer edge of the heat exchange fin.

[0012] In the technical solution, the specific arrangement of the heat exchange area of the heat exchange zone upstream being smaller than the heat exchange area of the heat exchange zone downstream is provided by the above arrangement. The distance from the outer edge of the heat exchange hole in the heat exchange zone upstream to the outer edge of the heat exchange fin, that is, the size of the entity structure that can realize heat exchange outside the heat exchange hole around the upstream heat exchange zone; similarly, the distance from the outer edge of the heat exchange hole in the heat exchange zone downstream to the outer edge of the heat exchange fin, that is, the size of the entity structure that can realize heat exchange outside the heat exchange hole around the downstream heat exchange zone.

[0013] Preferably, the heat exchange fin is provided with a hollow region, the hollow region is arranged between two adjacent heat exchange holes in the same heat exchange zone, and / or the hollow region is arranged between two adjacent heat exchange zones.

[0014] In the technical solution, the hollow region can reduce the heat exchange area on the heat exchange fin, thereby reducing the invalid heat storage, avoiding the accumulation of heat in the gas water heater after stopping burning for a period of time, and causing the water temperature to be too high in the middle due to the delay of the heat conduction performance of the metal material after the water is used again.

[0015] Preferably, the outer periphery of each of the heat exchange holes is provided with a first flange, wherein in the heat exchange holes in the same heat exchange area, the height of the first flange of the heat exchange hole in the middle position is less than the height of the first flange of the heat exchange hole in the edge position.

[0016] In the technical solution, since the heat exchange efficiency of the heat exchange tube in the middle position is higher than that of the heat exchange tube in the edge position in the heat exchange holes in the same heat exchange area, by setting the height of the first flange of the heat exchange hole in the middle position to be less than the height of the first flange of the heat exchange hole in the edge position in the heat exchange holes in the same heat exchange area along the upward direction of the flue gas, that is, the height of the first flange of the heat exchange hole in the middle position is reduced relative to the height of the first flange of the heat exchange hole in the edge position, the purpose of reducing heat exchange is achieved, and the heat exchange efficiency of the heat exchange tubes in the same heat exchange area is balanced.

[0017] Preferably, the top end of the heat exchange fin is provided with a second flange, and the second flange is a V-shaped flange; the second flange is located between adjacent heat exchange holes in the same heat exchange area, and the small end of the V-shaped flange is located upstream of the large end along the upward direction of the flue gas.

[0018] In the technical solution, by the above setting, the V-shaped flange can guide the flue gas to flow close to the heat exchange tube, fully exchange heat with the heat exchange tube, and achieve the beneficial technical effect of improving the heat exchange efficiency.

[0019] Preferably, the included angle of the V-shaped flange is 120-150 degrees.

[0020] In the technical solution, by setting the value range of the included angle of the V-shaped flange, while ensuring that the V-shaped flange can guide the flue gas to flow close to the heat exchange tube, the resistance formed by the V-shaped flange to the flue gas is avoided to be too large to affect the flow of the flue gas.

[0021] Preferably, the top end of the heat exchange fin is provided with a relief gap, and the distance from the bottom end of the relief gap to the outer edge of the closest heat exchange hole is greater than or equal to 2mm.

[0022] In the technical solution, the distance from the bottom end of the relief gap to the outer edge of the closest heat exchange hole, that is, the size of the solid structure between the gap and the closest heat exchange hole, by setting the size range of the solid structure, the connection strength between the gap on the heat exchange fin and the closest heat exchange hole is ensured, so as to ensure the flatness of the heat exchange fin at this position.

[0023] Preferably, a plurality of heat exchange tubes are connected by a bend joint to form a one-way flow channel, and the flow channel sequentially passes through the plurality of rows of heat exchange tubes from bottom to top along the upward direction of the flue gas.

[0024] In the technical solution, the flow channel passes through the multiple rows of heat exchange pipes from bottom to top along the flue gas rising direction, that is, the flow channel first passes through the whole row of heat exchange pipes in the upstream heat exchange zone and then passes through the whole row of heat exchange pipes in the downstream heat exchange zone, so that the water in the heat exchange pipes in the upstream heat exchange zone is fully heat exchanged before reaching the heat exchange pipes in the downstream heat exchange zone, the initial temperature of the heat exchange pipes in the downstream heat exchange zone is increased, the wall temperature of the heat exchange pipes in the downstream heat exchange zone is higher than the dew point temperature to prevent the condensate water from being generated on the surface of the heat exchange pipes during the heat exchange process, and the temperature of the heat exchange pipes will not be lower than the dew point temperature of the water vapor, so that the water vapor in the flue gas will not be condensed on the heat exchange pipes and the fins.

[0025] A gas water heater, characterized in that the gas water heater comprises the heat exchanger as described above.

[0026] The positive progress effect of the utility model lies in:

[0027] The utility model discloses a heat exchange fin with multiple heat exchange zones along the flue gas rising direction, which can change the heat exchange distribution of the upstream heat exchange zone and the downstream heat exchange zone, ensure the uniform heat absorption of different heat exchange zones (opposite upstream heat exchange zone and downstream heat exchange zone) on the heat exchange fin, improve the flue gas temperature of the heat exchange pipes in the downstream heat exchange zone through which the flue gas flows, and reduce or avoid the condensate water on the outer wall of the heat exchange pipes in the downstream heat exchange zone. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a structure front view schematic diagram of the heat exchanger of the utility model one preferable embodiment.

[0029] Figure 2 It is a part structure top view schematic diagram of the heat exchanger of the utility model one preferable embodiment.

[0030] Figure 3 It is a part structure left view schematic diagram of the heat exchanger of the utility model one preferable embodiment.

[0031] Figure 4 It is a part structure right view schematic diagram of the heat exchanger of the utility model one preferable embodiment.

[0032] Figure 5 It is a structure schematic diagram of the heat exchange fin of the heat exchanger of the utility model one preferable embodiment (one).

[0033] Figure 6 It is a structure schematic diagram of the heat exchange fin of the heat exchanger of the utility model one preferable embodiment (two).

[0034] Figure 7 It is Figure 6 The sectional view in A-A direction.

[0035] Figure 8 It is Figure 6Partially enlarged structural view of the middle B portion.

[0036] Explanation of reference numerals

[0037] Heat exchanger 1

[0038] Heat exchange tube 10

[0039] Water inlet 101 of the first heat exchange tube

[0040] Water outlet 102 of the first heat exchange tube

[0041] Water inlet 111 of the second heat exchange tube

[0042] Water outlet 112 of the second heat exchange tube

[0043] Water inlet 121 of the third heat exchange tube

[0044] Water outlet 122 of the third heat exchange tube

[0045] Water inlet 131 of the fourth heat exchange tube

[0046] Water outlet 132 of the fourth heat exchange tube

[0047] Water inlet 141 of the fifth heat exchange tube

[0048] Water outlet 142 of the fifth heat exchange tube

[0049] Water inlet 151 of the sixth heat exchange tube

[0050] Water outlet 152 of the sixth heat exchange tube

[0051] Water inlet 161 of the seventh heat exchange tube

[0052] Water outlet 162 of the seventh heat exchange tube

[0053] Water inlet 171 of the eighth heat exchange tube

[0054] Water outlet 172 of the eighth heat exchange tube

[0055] Water inlet 181 of the ninth heat exchange tube

[0056] Water outlet 182 of the ninth heat exchange tube

[0057] Water inlet 191 of the tenth heat exchange tube

[0058] Water outlet 192 of the tenth heat exchange tube

[0059] Heat exchange fin 20

[0060] First heat exchange zone 21

[0061] Second heat exchange zone 22

[0062] Heat exchange hole 23

[0063] Hollowed-out region 24

[0064] First hollowed-out region 241

[0065] Second hollowed-out region 242

[0066] Third hollowed-out region 243

[0067] First flange 25

[0068] Second flange 26

[0069] Notch 27

[0070] Bent joint 30 DETAILED DESCRIPTION

[0071] The embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and should not be understood as limiting the present application, and all other embodiments obtained by those skilled in the art based on the embodiments in the present application without creative labor fall within the scope of protection of the present application.

[0072] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0073] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0074] The preferred embodiments will be described below, and the present application will be more clearly and completely understood in conjunction with the accompanying drawings.

[0075] As Figures 1 to 8As shown, the embodiment provides a heat exchanger 1, which comprises a plurality of rows of heat exchange pipes 10 arranged along a flue gas upward direction P, each row of heat exchange pipes 10 comprising a plurality of heat exchange pipes 10 arranged along a width direction W of the heat exchanger 1.

[0076] The heat exchanger 1 further comprises a plurality of heat exchange fins 20 sleeved on the heat exchange pipes 10, the plurality of heat exchange fins 20 are arranged along a length direction L of the heat exchanger 1, each heat exchange fin 20 comprises a plurality of heat exchange areas along the flue gas upward direction P, the plurality of heat exchange areas correspond to the plurality of rows of heat exchange pipes 10 one by one, and the heat exchange areas of the plurality of heat exchange areas along the flue gas upward direction P increase successively.

[0077] In this way, by arranging the heat exchange areas of the plurality of heat exchange areas in the heat exchange fin 20 along the flue gas upward direction P to increase successively, the heat exchange distribution of the upstream heat exchange area and the downstream heat exchange area can be changed, the heat absorption of different heat exchange areas (opposite upstream heat exchange area and downstream heat exchange area) located on the heat exchange fin 20 is uniform, the flue gas temperature of the heat exchange pipe 10 through which the flue gas flows through the downstream heat exchange area is increased, so as to reduce or avoid the condensate water generated on the outer wall of the heat exchange pipe 10 located in the downstream heat exchange area. It should be noted that the flue gas temperature of the heat exchange area located upstream along the flue gas upward direction P is higher, and the heat exchange efficiency is higher. By reducing the heat exchange area of the heat exchange area located upstream, the flue gas temperature after the flue gas passes through the upstream heat exchange area can be increased, so as to increase the flue gas temperature reaching the downstream heat exchange area, and the pipe wall temperature of the heat exchange pipe 10 located in the downstream heat exchange area is increased. It should be noted that the length direction of the heat exchange pipe 10 is the same as the length direction L of the heat exchanger 1.

[0078] Please refer to Figure 5 In the embodiment, the heat exchanger 1 comprises two rows of heat exchange pipes 10 arranged along the flue gas upward direction P, and correspondingly, the heat exchange fin 20 comprises two heat exchange areas along the flue gas upward direction P, wherein the two heat exchange areas are a first heat exchange area 21 located upstream and a second heat exchange area 22 located downstream. The heat exchange areas of the two heat exchange areas along the flue gas upward direction P increase successively, that is, the heat exchange area of the first heat exchange area 21 is smaller than the heat exchange area of the second heat exchange area 22.

[0079] But not limited to this, in other embodiments, the number of rows of heat exchange pipes 10 can also be three rows, four rows, five rows or other number of rows; correspondingly, the number of heat exchange areas of heat exchange fins 20 can also be three, four, five or other number. When the number of rows of heat exchange pipes 10 is three rows, correspondingly, the number of heat exchange areas of heat exchange fins 20 is also three, and the heat exchange fins 20 are sequentially divided into a first heat exchange area, a second heat exchange area and a third heat exchange area along the flue gas upward direction P, that is, the first heat exchange area is located upstream of the second heat exchange area, and the second heat exchange area is located upstream of the third heat exchange area. The heat exchange area of the three heat exchange areas along the flue gas upward direction P increases in turn, that is, the heat exchange area of the first heat exchange area is smaller than the heat exchange area of the second heat exchange area, the heat exchange area of the second heat exchange area is smaller than the heat exchange area of the third heat exchange area, and so on.

[0080] In the present embodiment, heat exchange holes 23 corresponding to heat exchange pipes 10 are formed on the heat exchange fins 20 along the thickness direction, and the heat exchange pipes 10 are arranged in the heat exchange holes 23. Among them, the thickness direction of the heat exchange fins 20 is the same as the length direction of the heat exchange pipes 10.

[0081] The minimum distance d1 from the outer edge of the heat exchange hole 23 in the first heat exchange area 21 to the outer edge of the heat exchange fin 20 is smaller than the minimum distance d2 from the outer edge of the heat exchange hole 23 in the second heat exchange area 22 to the outer edge of the heat exchange fin 20. Among them, as shown in Figure 8 The distance d1 from the outer edge of the heat exchange hole 23 in the first heat exchange area 21 to the outer edge of the heat exchange fin 20, that is, the size of the heat exchange structure outside the heat exchange hole 23 around the first heat exchange area 21; similarly, the distance d2 from the outer edge of the heat exchange hole 23 in the second heat exchange area 22 to the outer edge of the heat exchange fin 20, that is, the size of the heat exchange structure outside the heat exchange hole 23 around the second heat exchange area 22. Therefore, by setting the minimum distance d1 from the outer edge of the heat exchange hole 23 in the first heat exchange area 21 to the outer edge of the heat exchange fin 20 is smaller than the minimum distance d2 from the outer edge of the heat exchange hole 23 in the second heat exchange area 22 to the outer edge of the heat exchange fin 20, the heat exchange area of the first heat exchange area 21 can be less than the heat exchange area of the second heat exchange area 22, and the uniformity of the heat absorption amount of different heat exchange areas located on the heat exchange fin 20 is ensured.

[0082] Specifically, the heat exchange fin 20 is provided with a hollow area 24, the hollow area 24 is arranged between two adjacent heat exchange holes 23 in the same heat exchange area, and / or the hollow area 24 is arranged between two adjacent heat exchange areas. In this way, by arranging the hollow area 24, the heat exchange area of the heat exchange fin 20 can be reduced, thereby reducing the invalid heat storage, avoiding the accumulation of heat in this place after the gas water heater stops burning for a period of time, and causing the water temperature to be too high in the middle due to the delay of the heat conduction performance of the metal material after the water is used again. Further, the minimum distance d3 between the outer periphery of the hollow area and the outer periphery of the heat exchange hole 23 is greater than or equal to 11.5 mm, so as to ensure the structural strength of the heat exchange hole 23.

[0083] In the embodiment, the hollow area 24 includes: a first hollow area 241 located between two adjacent heat exchange holes 23 in the same heat exchange area and between two adjacent heat exchange areas; a second hollow area 242 located only between two adjacent heat exchange areas; and a third hollow area 243 located only between two adjacent heat exchange holes 23 in the same heat exchange area.

[0084] The outer periphery of each heat exchange hole 23 is provided with a first flange 25, wherein in the heat exchange holes 23 in the same heat exchange area, the height of the first flange 25 of the heat exchange hole 23 located in the middle position is less than the height of the first flange 25 of the heat exchange hole 23 located in the edge position.

[0085] In this way, since the heat exchange efficiency of the heat exchange tube 10 located in the middle position is higher than that of the heat exchange tube 10 located in the edge position in the heat exchange holes 23 in the same heat exchange area, by arranging the height of the first flange 25 of the heat exchange hole 23 located in the middle position to be less than the height of the first flange 25 of the heat exchange hole 23 located in the edge position in the heat exchange holes 23 in the same heat exchange area along the upward direction P of the flue gas, i.e., the height of the first flange 25 of the heat exchange hole 23 located in the middle position is reduced relative to the height of the first flange 25 of the heat exchange hole 23 located in the edge position, the purpose of reducing heat exchange is achieved, and the heat exchange efficiency of the heat exchange tubes 10 in the same heat exchange area is balanced. For example, Figure 7 The height h2 of the first flange 25 of the heat exchange hole 23 located in the middle position is 1.7 mm, and the height h1 of the first flange 25 of the heat exchange tube 10 located in the edge position is 1.4 mm.

[0086] Further, the top end of the heat exchange fin 20 is provided with a second flange 26, the second flange 26 is a V-shaped flange; the second flange 26 is located between two adjacent heat exchange holes 23 in the same heat exchange area, and the small end of the V-shaped flange is located upstream of the large end along the upward direction P of the flue gas. In this way, through the above arrangement, the V-shaped flange can guide the flue gas to flow close to the heat exchange tube 10, fully exchange heat with the heat exchange tube 10, and achieve the beneficial technical effect of improving the heat exchange efficiency.

[0087] Preferably, the included angle a of the V-shaped flange is 120-150 degrees. In this way, by setting the value range of the included angle a of the V-shaped flange, while ensuring that the V-shaped flange can guide the flue gas to flow close to the heat exchange pipe 10, the resistance formed by the flue gas is avoided to be too large to affect the flow of the flue gas. Preferably, the included angle a of the V-shaped flange is 135-150 degrees.

[0088] The top end of the heat exchange fin 20 is provided with a clearance gap 27, and the distance d4 from the bottom end of the clearance gap 27 to the outer edge of the closest heat exchange hole 23 is greater than or equal to 2mm. The clearance gap 27 is used to avoid the installation of components around the heat exchange fin 20. In this way, the distance d4 from the bottom end of the clearance gap 27 to the outer edge of the closest heat exchange hole 23, i.e. the size of the solid structure between the gap 27 and the closest heat exchange hole 23, by setting the size range of the solid structure, ensures the connection strength between the gap 27 on the heat exchange fin 20 and the closest heat exchange hole 23, to ensure the flatness of the heat exchange fin 20 at this position.

[0089] In the present embodiment, each row of heat exchange pipes 10 includes five heat exchange pipes 10 arranged at intervals in the width direction W of the heat exchanger 1. However, it is not limited thereto, and the number of heat exchange pipes 10 in each row of heat exchange pipes 10 can be adjusted according to design requirements, and can be two, three, four, six or other numbers. The number of heat exchange pipes 10 in each row of heat exchange pipes 10 can be the same or different.

[0090] The two rows of heat exchange pipes 10 arranged in the flue gas upward direction P include a total of ten heat exchange pipes 10, which are respectively a first heat exchange pipe, a second heat exchange pipe, a third heat exchange pipe, a fourth heat exchange pipe and a fifth heat exchange pipe located in the first heat exchange area 21 of the heat exchange fin 20; and a sixth heat exchange pipe, a seventh heat exchange pipe, an eighth heat exchange pipe, a ninth heat exchange pipe and a tenth heat exchange pipe located in the second heat exchange area 22 of the heat exchange fin 20.

[0091] The temperature rise of each heat exchange pipe 10 of the heat exchanger 1 is K value, and the temperature rise value of the first heat exchange pipe 10 is K1, and so on. Experimental results show that the temperature rise value K2 of the second heat exchange pipe 10, the temperature rise value K3 of the third heat exchange pipe 10, the temperature rise value K4 of the fourth heat exchange pipe 10 have the highest proportion, and the temperature rise value K7 of the seventh heat exchange pipe 10 to the temperature rise value K10 of the tenth heat exchange pipe 10 have the lowest proportion. By adjusting the fin structure, the heat transfer distribution of the heat exchange pipe 10 can be changed to ensure that the heat exchange temperature rise ratio of the single-layer heat exchange pipe 10 is uniform, the flue gas temperature flowing through the heat exchange area in the downstream of the heat exchange fin 20 increases, the heat exchange efficiency of the heat exchange area in the downstream increases, and the generation of condensed water is prevented.

[0092] Further, the two rows of heat exchange pipes 10 arranged along the flue gas upward direction P are connected by the bend joint 30 to form a one-way flow channel, and the flow channel sequentially passes through the multiple rows of heat exchange pipes 10 from bottom to top along the flue gas upward direction P. In this way, the flow channel sequentially passes through the multiple rows of heat exchange pipes 10 from bottom to top along the flue gas upward direction P, that is, the flow channel first passes through the whole row of heat exchange pipes 10 of the first heat exchange area 21 and then passes through the whole row of heat exchange pipes 10 of the second heat exchange area 22; so that the water in the heat exchange pipes 10 of the first heat exchange area 21 is fully heat exchanged before reaching the heat exchange pipes 10 of the second heat exchange area 22, so as to increase the initial temperature of the heat exchange pipes 10 of the second heat exchange area 22, so that the wall temperature of the heat exchange pipes 10 of the downstream heat exchange area is higher than the dew point temperature to prevent condensate from being generated on the surface of the heat exchange pipes 10 during the heat exchange process, and the temperature will not be lower than the dew point temperature of the water vapor, so that the water vapor in the flue gas will not condense on the heat exchange pipes 10 and the heat exchange fins 20. As shown in FIGS. Figure 3 and Figure 4 The flow channel sequentially passes through the water inlet 101 of the first heat exchange pipe, the water outlet 102 of the first heat exchange pipe, the water inlet 111 of the second heat exchange pipe, the water outlet 112 of the second heat exchange pipe, the water inlet 121 of the third heat exchange pipe, the water outlet 122 of the third heat exchange pipe, the water inlet 131 of the fourth heat exchange pipe, the water outlet 132 of the fourth heat exchange pipe, the water inlet 141 of the fifth heat exchange pipe, the water outlet 142 of the fifth heat exchange pipe, the water inlet 151 of the sixth heat exchange pipe, the water outlet 152 of the sixth heat exchange pipe, the water inlet 161 of the seventh heat exchange pipe, the water outlet 162 of the seventh heat exchange pipe, the water inlet 171 of the eighth heat exchange pipe, the water outlet 172 of the eighth heat exchange pipe, the water inlet 181 of the ninth heat exchange pipe, the water outlet 182 of the ninth heat exchange pipe, the water inlet 191 of the tenth heat exchange pipe, and the water outlet 192 of the tenth heat exchange pipe. The bend joint 30 is connected between the water outlet 102 of the first heat exchange pipe and the water inlet 111 of the second heat exchange pipe, between the water outlet 112 of the second heat exchange pipe and the water inlet 121 of the third heat exchange pipe, between the water outlet 122 of the third heat exchange pipe and the water inlet 131 of the fourth heat exchange pipe, between the water outlet 132 of the fourth heat exchange pipe and the water inlet 141 of the fifth heat exchange pipe, between the water outlet 142 of the fifth heat exchange pipe and the water inlet 151 of the sixth heat exchange pipe, between the water outlet 152 of the sixth heat exchange pipe and the water inlet 161 of the seventh heat exchange pipe, between the water outlet 162 of the seventh heat exchange pipe and the water inlet 171 of the eighth heat exchange pipe, between the water outlet 172 of the eighth heat exchange pipe and the water inlet 181 of the ninth heat exchange pipe, and between the water outlet 182 of the ninth heat exchange pipe and the water inlet 191 of the tenth heat exchange pipe.

[0093] The embodiment also provides a gas water heater, which comprises the heat exchanger 1 as described above.

[0094] In the embodiment, by setting the heat exchange areas of the plurality of heat exchange zones in the heat exchange fin 20 along the flue gas upward direction P to be sequentially increased, the heat exchange distribution of the first heat exchange zone 21 and the second heat exchange zone 22 can be changed, the heat absorption amounts of different heat exchange zones (opposite upstream heat exchange zone and downstream heat exchange zone) located on the heat exchange fin 20 are ensured to be uniform, the flue gas temperature flowing through the heat exchange pipes 10 of the second heat exchange zone 22 is increased, so that the condensate water generated on the outer wall of the heat exchange pipes 10 of the second heat exchange zone 22 is reduced or avoided.

[0095] Although the specific embodiments of the present application are described above, those skilled in the art should understand that this is only an example, the protection scope of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present application, but these changes and modifications all fall within the protection scope of the present application.

Claims

1. A heat exchanger, characterized by, The heat exchanger comprises multiple rows of heat exchange pipes arranged along the direction of the rising flue gas, each row of heat exchange pipes comprises multiple heat exchange pipes arranged along the width direction of the heat exchanger; The heat exchanger further comprises multiple heat exchange fins sleeved on the heat exchange pipes, the multiple heat exchange fins are arranged along the length direction of the heat exchanger, each heat exchange fin comprises multiple heat exchange areas along the direction of the rising flue gas, the multiple heat exchange areas correspond to the multiple rows of heat exchange pipes one by one, and the heat exchange areas of the multiple heat exchange areas along the direction of the rising flue gas increase successively.

2. The heat exchanger of claim 1, wherein The heat exchange fin is provided with heat exchange holes corresponding to the heat exchange pipes along the thickness direction, and the heat exchange pipes are arranged in the heat exchange holes.

3. The heat exchanger of claim 2, wherein The minimum distance from the outer edge of the heat exchange hole in the heat exchange area upstream to the outer edge of the heat exchange fin is smaller than the minimum distance from the outer edge of the heat exchange hole in the heat exchange area downstream to the outer edge of the heat exchange fin.

4. The heat exchanger of claim 2, wherein The heat exchange fin is provided with a hollow region, the hollow region is arranged between two adjacent heat exchange holes in the same heat exchange area, and / or the hollow region is arranged between two adjacent heat exchange areas.

5. The heat exchanger of claim 2, wherein The outer periphery of each heat exchange hole is provided with a first flange, wherein in the heat exchange holes in the same heat exchange area, the height of the first flange of the heat exchange hole at the middle position is smaller than the height of the first flange of the heat exchange hole at the edge position.

6. The heat exchanger of claim 2, wherein The top end of the heat exchange fin is provided with a second flange, the second flange is a V-shaped flange; the second flange is arranged between two adjacent heat exchange holes in the same heat exchange area, and the small end of the V-shaped flange is upstream of the large end along the direction of the rising flue gas.

7. The heat exchanger of claim 6, wherein The included angle of the V-shaped flange is 120-150 degrees.

8. The heat exchanger of claim 2, wherein The top end of the heat exchange fin is provided with a relief notch, and the distance from the bottom end of the relief notch to the outer edge of the closest heat exchange hole is greater than or equal to 2mm.

9. The heat exchanger according to any one of claims 1 to 8, wherein Multiple heat exchange pipes are connected by a bend joint to form a one-way flow channel, and the flow channel passes through the multiple rows of heat exchange pipes successively from bottom to top along the direction of the rising flue gas.

10. A gas water heater characterized by, The gas water heater comprises the heat exchanger according to any one of claims 1-9.

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