Heat exchange fin, heat exchanger and gas water heater

Abstract

The invention discloses a heat exchange fin, a heat exchanger and a gas water heater, and relates to the technical field of heat exchange. Wherein the heat exchange fin is provided with a first row of mounting holes at least close to the smoke inlet side, the area, corresponding to the first row of mounting holes, of the heat exchange fin is a first area, the first area is provided with a water inlet side and a water outlet side which are opposite to each other, the mounting holes, close to the water inlet side, in the first row of mounting holes are first mounting holes, and the mounting holes, close to the water outlet side, in the first row of mounting holes are second mounting holes; the height, protruding out of the hole walls of the first row of mounting holes, of the smoke inlet side edge of the first area is defined as the fin height, and the requirement that the fin height at the first mounting holes is larger than the fin height at the second mounting holes is met. According to the technical scheme, the material waste is reduced while the heat exchange efficiency is guaranteed, and the water cut-off temperature rise problem of the gas water heater can be effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchange, and in particular to a heat exchange fin, a heat exchanger and a gas water heater. Background Art

[0002] Gas water heaters use gas as fuel, which burns to produce high-temperature flue gas, which absorbs heat from the high-temperature flue gas through the fins and heat exchange tubes of the heat exchanger to heat the water passing through.

[0003] In the related art, the fins of the heat exchanger are at the same height from the water inlet to the water outlet, resulting in insufficient heat exchange capacity in the front section and saturation and waste of materials in the back section. In addition, the water shut-off temperature rise is relatively high under this solution. Summary of the invention

[0004] The main purpose of the present invention is to provide a heat exchange fin, a heat exchanger and a gas water heater, which aims to ensure heat exchange efficiency while reducing material waste, and can also effectively improve the problem of temperature rise when the gas water heater is shut off.

[0005] To achieve the above-mentioned purpose, the heat exchange fin proposed in the present invention is provided with at least a first row of mounting holes close to the smoke inlet side, the area of ​​the heat exchange fin corresponding to the first row of mounting holes is the first area, the first area has a relative water inlet side and a water outlet side, wherein the mounting holes in the first row of mounting holes close to the water inlet side are the first mounting holes, and the mounting holes close to the water outlet side are the second mounting holes; The height of the smoke inlet side edge of the first region protruding from the hole wall of the first row of mounting holes is defined as the fin height, which satisfies: The fin height at the first mounting hole is greater than the fin height at the second mounting hole.

[0006] In one embodiment of the present application, the heights of the fins corresponding to the first row of mounting holes decrease successively from the first mounting holes to the second mounting holes.

[0007] In one embodiment of the present application, the height of the fins corresponding to the first row of mounting holes decreases intermittently from the first mounting holes to the second mounting holes.

[0008] In one embodiment of the present application, in the direction from the first mounting hole to the second mounting hole, the first row of mounting holes includes at least a first group of mounting holes, a second group of mounting holes, and the second mounting holes, the fin height corresponding to the first group of mounting holes is greater than the fin height corresponding to the second group of mounting holes, and the fin height corresponding to the second group of mounting holes is greater than the fin height corresponding to the second mounting holes.

[0009] In one embodiment of the present application, the first group of mounting holes includes at least two mounting holes, and the fin heights corresponding to the mounting holes in the first group of mounting holes are the same or arranged in decreasing order; Alternatively, the first group of mounting holes is the first mounting holes.

[0010] In one embodiment of the present application, the second group of mounting holes includes at least two mounting holes, and the fin heights corresponding to the mounting holes in the second group of mounting holes are the same or arranged in decreasing order.

[0011] In one embodiment of the present application, a convex arc portion is formed on the smoke inlet side edge of the first region corresponding to the outer circumference of each mounting hole in the first row of mounting holes, and the convex arc portion is concentrically arranged with the corresponding mounting hole.

[0012] To achieve the above object, the present application also provides a heat exchanger, comprising the above heat exchange fins and heat exchange tubes installed in the installation holes, wherein a plurality of the heat exchange tubes are connected to form a heat exchange flow channel; Wherein, the heat exchange tube installed in the second installation hole is provided with an outlet of the heat exchange flow channel.

[0013] In one embodiment of the present application, the plurality of mounting holes are arranged in a single row, and the heat exchange tube installed in the first mounting hole is provided with an inlet of the heat exchange flow channel; Alternatively, the plurality of mounting holes are arranged in at least two rows, and the inlet of the heat exchange channel is provided on the heat exchange tube installed at the first mounting hole or on the heat exchange tube at other mounting holes except the first row of mounting holes.

[0014] To achieve the above object, the present application also provides a heat exchanger, comprising: A plurality of heat exchange tubes are arranged in parallel and spaced apart to form at least one row, and are connected in series to form a heat exchange flow channel; wherein the row of heat exchange tubes close to the smoke inlet side is the first row of heat exchange tubes, the heat exchange tubes at the end of the heat exchange flow channel in the first row of heat exchange tubes are the end heat exchange tubes, and the heat exchange tubes at the front end of the heat exchange flow channel are the front end heat exchange tubes; and The heat exchange fins are sleeved on the outer circumference of the plurality of heat exchange tubes; the height of the smoke inlet side edge of the heat exchange fin protruding from the outer surface of the first row of heat exchange tubes is defined as the fin height, which satisfies: The height of the fins at the end heat exchange tube is smaller than the height of the fins at the front heat exchange tube.

[0015] In one embodiment of the present application, the heights of the fins corresponding to the plurality of heat exchange tubes in the first row decrease successively from the front heat exchange tube to the rear heat exchange tube.

[0016] In one embodiment of the present application, in the direction from the front end heat exchange tube to the terminal heat exchange tube, the first row of heat exchange tubes includes at least a first group of heat exchange tubes, a second group of heat exchange tubes and the terminal heat exchange tube, the fin height corresponding to the first group of heat exchange tubes is greater than the fin height corresponding to the second group of heat exchange tubes, and the fin height corresponding to the second group of heat exchange tubes is greater than the fin height corresponding to the terminal heat exchange tube.

[0017] In one embodiment of the present application, the first group of heat exchange tubes includes at least two heat exchange tubes, and the fins corresponding to the at least two heat exchange tubes in the first group of heat exchange tubes have the same height, or the first group of heat exchange tubes are the front end heat exchange tubes; And / or, the second group of heat exchange tubes includes at least two heat exchange tubes, and the fin heights corresponding to the at least two heat exchange tubes in the second group of heat exchange tubes are arranged in decreasing order.

[0018] In one embodiment of the present application, the outlet of the heat exchange channel is provided at the terminal heat exchange tube; And / or, the inlet of the heat exchange channel is arranged at the front end heat exchange tube.

[0019] To achieve the above-mentioned purpose, the present application also provides a gas water heater, comprising a combustion heat exchange chamber and the above-mentioned heat exchanger, wherein the heat exchanger is arranged in the combustion heat exchange chamber.

[0020] The heat exchange fins of the technical solution of the present invention are provided with at least a first row of mounting holes close to the smoke inlet side, the mounting holes in the first row of mounting holes close to the water inlet side are the first mounting holes, and the mounting holes close to the water outlet side are the second mounting holes, so that the heat exchange tube installed at the first mounting hole is located on the upstream side of the waterway, and the heat exchange tube installed at the second mounting hole is located on the downstream side of the waterway. By setting the fin height at the second mounting hole to be smaller than the fin height at the first mounting hole, the fin height corresponding to the heat exchange tube at a lower water temperature is higher, and the fin height corresponding to the heat exchange tube at a higher water temperature is lower, thereby ensuring sufficient heat exchange area to ensure heat exchange efficiency and reducing material consumption. At the same time, it can also effectively improve the problem of temperature rise when the gas water heater is shut off. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention 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 present invention. 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 present application; Figure 2This is a schematic structural diagram of a single-row heat exchange tube embodiment in the heat exchanger of the present application; Figure 3 This is a structural schematic diagram of an embodiment of reducing the fin height when the mounting holes in the heat exchange fin of the present application are in a single row; Figure 4 This is a structural schematic diagram of another embodiment of the present application in which the fin height is reduced when the mounting holes in the heat exchange fin are in a single row; Figure 5 This is a structural schematic diagram of another embodiment of reducing the fin height when the mounting holes in the heat exchange fin of the present application are in a single row; Figure 6 This is a structural schematic diagram of an embodiment of reducing the fin height when the mounting holes in the heat exchange fin of the present application are double rows; Figure 7 This is a structural schematic diagram of another embodiment of the present application in which the fin height is reduced when the mounting holes in the heat exchange fins are double-rowed; Figure 8 This is a structural schematic diagram of another embodiment of reducing the fin height when the mounting holes in the heat exchange fin of the present application are double-rowed; Fig. 9 This is a structural schematic diagram of an embodiment of reducing the fin height when there are three rows of mounting holes in the heat exchange fin of the present application; Fig.10 This is a structural schematic diagram of another embodiment of the present application in which the fin height is reduced when there are three rows of mounting holes in the heat exchange fin; Fig.11 This is a schematic diagram of an embodiment of a gas water heater of the present application.

[0023] Description of Figure Numbers: 1. Heat exchange fins; 101. Mounting holes; 11. First row of mounting holes; 11a. First mounting holes; 11b. Second mounting holes; 111. First group of mounting holes; 112. Second group of mounting holes; 12. Convex arc portion; 2. Heat exchange tubes; 301. Cold water inlet pipe; 302. Hot water outlet pipe; 4. Combustion heat exchange chamber; 5. Fan. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] 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 under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0026] At the same time, the meaning of "and / or" or "and / or" appearing in the full text includes three options. Taking "A and / or B" as an example, it includes option A, or option B, or a option in which both A and B are satisfied.

[0027] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0028] The heat exchanger is an important component of the gas water heater. Cold water enters from the inlet of the heat exchanger and flows out from the outlet after being heated. The heat exchanger in the related art is a tube-fin heat exchanger. The heat exchange fins of the heat exchanger are all at the same height. On the water flow path, there are problems such as insufficient heat exchange capacity in the front section and saturation and waste of materials in the back section. Moreover, under this solution, the heat exchange fins have more materials and heavier weight, resulting in larger heat storage and higher water shut-off temperature rise.

[0029] To this end, the present invention proposes a heat exchange fin 1, which aims to ensure heat exchange efficiency while reducing material usage and improve water shut-off temperature rise by reasonably designing the height of the heat exchange fin 1. The structure of the heat exchange fin 1 is described below in the form of an embodiment.

[0030] See also Figures 1 to 4 , Figure 6 as well as Fig. 9The heat exchange fin 1 is provided with at least a first row of mounting holes 11 close to the smoke inlet side, and the area of ​​the heat exchange fin 1 corresponding to the first row of mounting holes 11 is the first area, and the first area has a relative water inlet side and a water outlet side, wherein the mounting holes 101 close to the water inlet side in the first row of mounting holes 11 are the first mounting holes 11a, and the mounting holes 101 close to the water outlet side are the second mounting holes 11b; the height of the edge of the smoke inlet side of the first area protruding from the hole wall of the first row of mounting holes 11 is defined as the fin height, which satisfies: the fin height at the first mounting hole 11a is greater than the fin height at the second mounting hole 11b.

[0031] The heat exchange fins 1 play a role in increasing the heat exchange area and improving the heat exchange efficiency. The mounting holes 101 on the heat exchange fins 1 are used to penetrate and install the heat exchange tubes 2. In the direction along which the heat exchange tubes 2 extend, the heat exchange tubes 2 are provided with a plurality of heat exchange fins 1 arranged at intervals. Each heat exchange fin 1 is penetrated and installed with a plurality of heat exchange tubes 2 to form a heat exchanger. When the heat exchanger is used in a gas water heater, the high-temperature flue gas generated by the combustion of the gas flows to the gap between two adjacent heat exchange fins 1 and the gap between two adjacent heat exchange tubes 2 to heat the water in the heat exchange tubes 2.

[0032] The heat exchange fin 1 is provided with at least a first row of mounting holes 11 close to the smoke inlet side. It can be understood that the heat exchange fin 1 can be provided with a row of mounting holes 101 in the direction of smoke flow, or can be provided with two or more rows of mounting holes 101. Among them, the arrangement direction of a single row of mounting holes 101 can be perpendicular to the smoke flow direction, so that the smoke can pass through the gaps between the heat exchange tubes 2 at the mounting holes 101. For ease of understanding, this specification takes the flow of smoke from bottom to top as an example for explanation. The smoke flows from bottom to top, and the multiple mounting holes 101 can be arranged in a single row in the horizontal direction, and the mounting holes 101 in different rows are arranged at intervals along the upper and lower sides, wherein the mounting holes 101 in two adjacent rows can be arranged relative or staggered.

[0033] It can be understood that multiple heat exchange tubes 2 are connected to form a heat exchange flow channel, and the water flow path thereof can be determined according to actual conditions. For example, when there is one row, the heat exchange fin 1 is only provided with the first row of mounting holes 11. At this time, the fluid flow path of the multiple heat exchange tubes 2 can be from the heat exchange tube 2 at the mounting hole 101 on one side (such as the first mounting hole 11a close to the water inlet side) to the heat exchange tube 2 at the mounting hole 101 on the other side (such as the second mounting hole 11b close to the water outlet side); when there are two or more rows, it can flow through one row first and then through another row, or it can flow interspersed along different rows of heat exchange tubes 2. In this embodiment, a row of mounting holes 101 close to the smoke inlet side is the first row of mounting holes 11, and the heat exchange tubes 2 in the first row of mounting holes 11 are the first row of heat exchange tubes 2, wherein the first mounting holes 11a are installed with the heat exchange tubes 2 located at the upstream end of the waterway in the first row of heat exchange tubes 2, and the second mounting holes 11b are installed with the heat exchange tubes 2 located at the downstream end of the waterway in the first row of heat exchange tubes 2. It can be understood that when there is only the first row of mounting holes 11, the multiple heat exchange tubes 2 are the first row of heat exchange tubes 2. In this way, the heat exchange tubes 2 at the upstream end of the waterway and the heat exchange tubes at the downstream end of the waterway 2 are respectively close to the water inlet side and the water outlet side of the heat exchange fin 1, that is, the fluid flows along the arrangement direction of the first row of mounting holes 11; when the multiple mounting holes 101 are two or more rows, the first row of mounting holes 11 is the lowest row of mounting holes 101 (taking the flue gas flowing from bottom to top as an example), no matter whether the water flows through one row first and then another row or flows along different rows of heat exchange tubes 2 interspersed, in the heat exchange tubes 2 of the first row of mounting holes 11, the heat exchange tube 2 at the first mounting hole 11a is located on the water path upstream side of the heat exchange tube 2 at the second mounting hole 11b. That is, the water flow in the first row of heat exchange tubes 2 enters from the heat exchange tube 2 at the first mounting hole 11a and finally exits from the heat exchange tube 2 at the second mounting hole 11b, then the temperature of the water in the heat exchange tube 2 at the second mounting hole 11b will be higher than the temperature of the water in the heat exchange tube 2 at the first mounting hole 11a.

[0034] It should be noted that the relationship between the fin heights corresponding to the different mounting holes 101 recorded in this specification is for the same heat exchange fin 1. For ease of explanation, in this embodiment, the area of ​​the heat exchange fin 1 corresponding to the first row of mounting holes 11 is defined as the first area, and the first area is the area where the heat exchange fin 1 covers the first row of mounting holes 11 and extends from one lateral side to the other lateral side, and the first mounting hole 11a and the second mounting hole 11b are respectively arranged on both sides of the first area. The fin height H is defined as the height of the smoke inlet side edge (lower edge) of the first region protruding from the hole wall of the first row of mounting holes 11. By setting the fin height H2 at the second mounting hole 11b to be smaller than the fin height H1 at the first mounting hole 11a, the fin height at the heat exchange tube 2 with lower water temperature in the heat exchange flow channel is relatively high, and the heat exchange temperature difference is large. At this time, the larger fin height can provide a sufficiently large heat exchange area and improve the heat exchange efficiency. At the same time, when water flows to the heat exchange tube 2 at the second mounting hole 11b, its water temperature has been heated to a certain extent. The water temperature in the heat exchange tube 2 at the second mounting hole 11b is high, the heat exchange temperature difference is small, and the relatively required heat exchange area does not need to be so much. At this time, reducing the fin height at the second mounting hole 11b can not only ensure sufficient heat exchange area, but also save material consumption. In this way, the heat exchange efficiency can be ensured while reducing the material consumption.

[0035] In addition, since the height of the fin at the second mounting hole 11b is reduced, compared with the method in the related art where the height of the heat exchanger fin 1 remains unchanged, the overall weight of the heat exchanger fin 1 of the heat exchanger in this embodiment is reduced, thereby being able to reduce the overall heat storage capacity of the heat exchange fin 1 (heat storage capacity = weight × temperature), thereby effectively improving the problem of temperature rise when the gas water heater is shut off, reducing the temperature rise when the water is shut off, and avoiding users from being scalded by the heated water when turning off the water and then turning on the water, thereby improving the user experience.

[0036] In summary, the heat exchange fin 1 of the technical solution of the present invention is provided with at least a first row of mounting holes 11 close to the smoke inlet side, the mounting hole 101 close to the water inlet side in the first row of mounting holes 11 is the first mounting hole 11a, and the mounting hole 101 close to the water outlet side is the second mounting hole 11b, so that the heat exchange tube 2 installed at the first mounting hole 11a is located on the upstream side of the waterway, and the heat exchange tube 2 installed at the second mounting hole 11b is located on the downstream side of the waterway. By setting the fin height at the second mounting hole 11b to be smaller than the fin height at the first mounting hole 11a, the fin height corresponding to the heat exchange tube 2 at a lower water temperature is higher, and the fin height corresponding to the heat exchange tube 2 at a higher water temperature is lower, thereby ensuring sufficient heat exchange area to ensure heat exchange efficiency, reducing material consumption, and at the same time, effectively improving the problem of temperature rise when the gas water heater is shut off.

[0037] See also Figures 3 to 10In order to further improve the heat exchange efficiency, a convex arc portion 12 is formed on the outer periphery of each mounting hole 101 in the first row of mounting holes 11 at the smoke inlet side edge of the heat exchange fin 1 , and the convex arc portion 12 is concentrically arranged with the corresponding mounting hole 101 .

[0038] In the present embodiment, a convex arc portion 12 is provided on the outer periphery of the mounting hole 101 close to the smoke inlet side, and a concave guide groove is formed between two adjacent convex arc portions 12. The guide groove can guide the high-temperature smoke toward the heat exchange tubes 2 on both sides. At the same time, the convex arc portion 12 is concentrically arranged with the corresponding mounting hole 101, and the fin heights on the smoke-facing side of the mounting hole 101 are roughly equal, so that the heat exchange area on the smoke-facing side of the mounting hole 101 is evenly distributed, thereby achieving the effect of uniform heat exchange on the heat exchange tube 2 at the mounting hole 101.

[0039] See also Figures 3 to 10 In the embodiment of the present application, the height of the fins corresponding to the first row of mounting holes 11 decreases from the first mounting hole 11a to the second mounting hole 11b.

[0040] It can be understood that, for the water path of the heat exchange tube 2 in the first row of mounting holes 11, the heat exchange tube 2 at the first mounting hole 11a is located upstream of the water path, and the heat exchange tube 2 at the second mounting hole 11b is located downstream of the water path. The water flows into the heat exchange tube 2 at the first mounting hole 11a, and flows to the heat exchange tube 2 at the second mounting hole 11b after being heated. Then, the water flow temperature increases from the heat exchange tube 2 at the first mounting hole 11a to the heat exchange tube 2 at the second mounting hole 11b, and the temperature difference between the water flow and the flue gas decreases from the heat exchange tube 2 at the first mounting hole 11a to the heat exchange tube 2 at the second mounting hole 11b. In this embodiment, by decreasing the fin height corresponding to the first row of mounting holes 11 from the first mounting hole 11a to the second mounting hole 11b, the fin height at the first mounting hole 11a is higher, and the fin height at the second mounting hole 11b is lower. On the one hand, the fin heat exchange area at the place with a larger temperature difference can be guaranteed to improve the heat exchange efficiency, and on the other hand, the waste of fin material at the place with a smaller temperature difference can be reduced.

[0041] In actual application, the specific manner in which the fin height corresponding to the first row of mounting holes 11 is reduced from the heat exchange tube 2 at the first mounting hole 11a to the heat exchange tube 2 at the second mounting hole 11b can be determined according to actual conditions.

[0042] See also Figure 3 , Figure 6 as well as Fig. 9In some embodiments, the fin heights corresponding to the first row of mounting holes 11 decrease from the first mounting hole 11a to the second mounting hole 11b. In this embodiment, among the fin heights corresponding to each two adjacent mounting holes 101, the fin height corresponding to the mounting hole 101 located on the downstream side of the waterway is smaller than the fin height corresponding to the mounting hole 101 located on the upstream side of the waterway, that is, the fin heights corresponding to each mounting hole 101 in the first row decrease one by one. With such a design, the decreasing trend of the fin height corresponding to the first row of mounting holes 11 can roughly match the decreasing trend of the temperature difference between the water flow and the flue gas in the first row of heat exchange tubes 2, which can improve thermal efficiency and reduce material usage.

[0043] See also Figure 4 , Figure 7 as well as Fig.10 In some embodiments, the fin height corresponding to the first row of mounting holes 11 decreases intermittently from the first mounting hole 11a to the second mounting hole 11b. In this embodiment, in the direction from the first mounting hole 11a to the second mounting hole 11b, the fin height corresponding to the multiple mounting holes 101 can be decreased once every one or several mounting holes 101, wherein the same number of mounting holes 101 can be spaced each time, or different numbers of mounting holes 101 can be spaced each time. Such a design can ensure that the fin height corresponding to the first mounting hole 11a is higher, and the fin height corresponding to the second mounting hole 11b is lower, which can improve thermal efficiency and reduce material usage.

[0044] See also Figure 4 , Figure 5 , Figure 7 , Figure 8 as well as Fig.10 In some embodiments, in the direction from the first mounting hole 11a to the second mounting hole 11b, the first row of mounting holes 11 at least includes a first group of mounting holes 111, a second group of mounting holes 112, and a second mounting hole 11b, the fin height corresponding to the first group of mounting holes 111 is greater than the fin height corresponding to the second group of mounting holes 112, and the fin height corresponding to the second group of mounting holes 112 is greater than the fin height corresponding to the second mounting hole 11b. In this embodiment, in the direction from the first mounting hole 11a to the second mounting hole 11b, the plurality of mounting holes 101 are at least divided into the first group of mounting holes 111, the second group of mounting holes 112, and the second mounting hole 11b, the fin height corresponding to the first group of mounting holes 111, the fin height corresponding to the second group of mounting holes 112, and the fin height corresponding to the second mounting hole 11b are arranged in a decreasing manner, which can improve the heat exchange efficiency while reducing the amount of material used.

[0045] It should be noted that the first group of mounting holes 111 in this embodiment may include one, two or more mounting holes 101. When only one mounting hole 101 is included, the first group of mounting holes 111 is the first mounting hole 11a. When two or more mounting holes 101 are included, the fin heights corresponding to at least two mounting holes 101 in the first group of mounting holes 111 may be the same or set in descending order. It can be understood that in actual application, the temperature in the middle of the combustion heat exchange chamber of the gas water heater is higher than the temperature on both sides of the lateral direction. The first group of mounting holes 111 is located in the lateral side area of ​​the combustion heat exchange chamber, that is, the flue gas temperature at the location of the first group of mounting holes 111 is relatively low, and the water temperature in the heat exchange tube 2 at the first group of mounting holes 111 is in a relatively low state. Therefore, the fin height corresponding to the first group of mounting holes 111 can be set to be unchanged to increase the fin heat exchange area and heat the water quickly. Optionally, the first group of mounting holes 111 may include two, three, four or more mounting holes 101.

[0046] The second group of mounting holes 112 may also include one, two or more mounting holes 101. When two or more mounting holes 101 are included, the fin heights corresponding to at least two mounting holes 101 in the second group of mounting holes 112 are the same or arranged in decreasing order. It can be understood that in actual application, the temperature in the middle of the combustion heat exchange chamber of the gas water heater is higher than the temperature on both sides. The second group of mounting holes 112 is roughly located in the middle area of ​​the combustion heat exchange chamber, that is, the flue gas temperature at the location of the second group of mounting holes 112 is relatively high, and the water temperature in the heat exchange tube 2 at the second group of mounting holes 112 may not be heated to a high enough level. At this time, the fin height corresponding to at least two mounting holes 101 in the second group of mounting holes 112 can be set to be unchanged to increase the fin heat exchange area and heat the water quickly; or, the water temperature in the heat exchange tube 2 at the second group of mounting holes 112 may have been heated to a high enough level, then the fin height corresponding to at least two mounting holes 101 in the second group of mounting holes 112 can be set to decrease in a decreasing manner to ensure the heat exchange efficiency while reducing the material consumption. Optionally, the second group of mounting holes 112 may include two, three, four or more mounting holes 101.

[0047] Therefore, this embodiment can improve the heat exchange efficiency while reducing the amount of material used, and can also effectively reduce the water shut-off temperature rise.

[0048] To achieve the above object, the present invention also provides a heat exchanger, see Figure 1 and Figure 2The heat exchanger includes a plurality of heat exchange tubes 2 and heat exchange fins 1. The specific structure of the heat exchange fins 1 refers to the above-mentioned embodiment. Since the heat exchanger adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here. Among them, a plurality of heat exchange tubes 2 are connected to form a heat exchange flow channel; the heat exchange tube 2 installed in the second mounting hole 11b is provided with an outlet of the heat exchange flow channel. With such a configuration, the fin height corresponding to the heat exchange tube 2 at a lower water temperature is higher, and the fin height corresponding to the heat exchange tube 2 at a higher water temperature is lower, thereby ensuring sufficient heat exchange area to ensure heat exchange efficiency, reducing material consumption, and at the same time, effectively improving the problem of temperature rise when the gas water heater is shut off.

[0049] Optionally, a plurality of heat exchange tubes 2 may be connected in series, in parallel, or in mixed connection (both in series and in parallel).

[0050] Optionally, the outlet of the heat exchange flow channel is arranged on the heat exchange tube 2 at the second mounting hole 11b. This arrangement can better ensure the heat exchange efficiency while saving materials, and can further reduce the heating temperature rise of the water in the heat exchange tube 2 at the downstream end of the water path by the heat exchange fin 1 during the water outage period, thereby reducing the water outage temperature rise. Optionally, the heat exchange tube 2 at the second mounting hole 11b is connected to the hot water outlet pipe 302 of the gas water heater.

[0051] Optionally, the inlet of the heat exchange channel can be determined according to actual conditions. For example, when multiple heat exchange tubes 2 are arranged in a row, the inlet of the heat exchange channel is arranged on the heat exchange tube 2 at the first mounting hole 11a. At this time, the water temperature in the heat exchange tube 2 at the first mounting hole 11a is relatively low, and the fin height of the heat exchange fin 1 is relatively high, which can increase the heat exchange area and improve the heating efficiency of the water. Optionally, the heat exchange tube 2 at the first mounting hole 11a is connected to the cold water inlet pipe 301 of the gas water heater; when multiple heat exchange tubes 2 are arranged in two or more rows, the inlet of the heat exchange channel It can be arranged on the heat exchange tube 2 at the first mounting hole 11a or on other heat exchange tubes 2 except the first row of heat exchange tubes 2. When the inlet is arranged on other heat exchange tubes 2 except the first row of heat exchange tubes 2, for the first row of heat exchange tubes 2, the water flow still enters from the heat exchange tube 2 at the first mounting hole 11a. The water temperature in the heat exchange tube 2 at the first mounting hole 11a is lower than the water temperature in the heat exchange tube 2 at the second mounting hole 11b. The fin height at the first mounting hole 11a is relatively high, which can increase the heat exchange area and improve the heating efficiency of water.

[0052] To achieve the above purpose, Figures 1 to 10 The present invention provides a heat exchanger, comprising a plurality of heat exchange tubes 2 and heat exchange fins 1; the plurality of heat exchange tubes 2 are arranged in parallel and spaced apart to form at least one row, and are connected in series to form a heat exchange flow channel; wherein a row of heat exchange tubes 2 close to the smoke inlet side is a first row of heat exchange tubes, and the heat exchange tube 2 at the end of the heat exchange flow channel in the first row of heat exchange tubes is a terminal heat exchange tube (such as Figures 3 to 10 The heat exchange tube 2 located at the front end of the heat exchange flow channel is the front end heat exchange tube (such as Figures 3 to 10 The heat exchange fin 1 is sleeved on the outer circumference of the plurality of heat exchange tubes 2; the height of the smoke inlet side edge of the heat exchange fin 1 protruding from the outer surface of the first row of heat exchange tubes is defined as the fin height, so that the fin height at the end heat exchange tube is less than the fin height at the front heat exchange tube.

[0053] In this embodiment, a plurality of heat exchange tubes 2 are arranged in parallel and spaced apart to form at least one row, and are connected in series to form a heat exchange flow channel. It can be understood that after the cold water enters the inlet of the heat exchanger, it flows through the plurality of heat exchange tubes 2 in sequence for heat exchange and then flows out from the outlet of the heat exchanger. The plurality of heat exchange tubes 2 can be arranged in one row, two rows or multiple rows, wherein the single-row arrangement direction of the plurality of heat exchange tubes 2 can be perpendicular to the flue gas flow direction, and the flue gas flows from bottom to top. The plurality of heat exchange tubes 2 can be arranged in a single row in the horizontal direction, and the heat exchange tubes 2 in different rows are arranged at intervals in the vertical direction, wherein the heat exchange tubes 2 in two adjacent rows can be arranged relative to or staggered.

[0054] The row of heat exchange tubes 2 close to the smoke inlet side is the first row of heat exchange tubes. It can be understood that when multiple heat exchange tubes 2 are in one row, the multiple heat exchange tubes 2 are the first row of heat exchange tubes, and the fluid flows from the front heat exchange tube to the end heat exchange tube. In this way, the front heat exchange tube and the end heat exchange tube are respectively located on opposite sides of the heat exchanger, that is, the fluid flows along the arrangement direction of the first row of heat exchange tubes; when multiple heat exchange tubes 2 are in two or more rows, the first row of heat exchange tubes is the bottom row of heat exchange tubes 2 (taking the flow of smoke from bottom to top as an example). Since the heat exchange flow channel is a series flow channel, no matter whether the fluid flows through one row first and then through another row or flows along different rows of heat exchange tubes 2, the front heat exchange tube in the first row of heat exchange tubes is always located on the upstream side of the heat exchange flow channel of the end heat exchange tube. That is, the water flow in the first row of heat exchange tubes enters from the front heat exchange tube and finally exits from the rear heat exchange tube, and the temperature of the water in the rear heat exchange tube is higher than the temperature of the water in the front heat exchange tube.

[0055] It should be noted that the relationship between the fin heights corresponding to different heat exchange tubes 2 recorded in this specification is for the same heat exchange fin 1. In this embodiment, the fin height is defined as the height of the smoke inlet side edge (lower edge) of the heat exchange fin 1 protruding from the outer surface of the first row of heat exchange tubes. By setting the fin height at the end heat exchange tube to be smaller than the fin height at the front heat exchange tube, the fin height at the front heat exchange tube where the water temperature in the tube is lower is relatively high, and the heat exchange temperature difference is large. At this time, the larger fin height can provide a sufficiently large heat exchange area and improve the heat exchange efficiency; at the same time, when the water flows to the end heat exchange tube, its water temperature has been heated to a certain extent, the water temperature in the end heat exchange tube is higher, the heat exchange temperature difference is small, and the relatively required heat exchange area does not need to be so much. At this time, reducing the fin height at the end heat exchange tube can not only ensure sufficient heat exchange area, but also save material consumption. In this way, the heat exchange efficiency can be guaranteed while reducing the material consumption.

[0056] In addition, since the height of the fins at the end heat exchange tube is reduced, compared with the method in the related art where the height of the heat exchange fins 1 of the heat exchanger remains unchanged, the overall weight of the heat exchange fins 1 of the heat exchanger in this embodiment is reduced, thereby being able to reduce the overall heat storage capacity of the heat exchange fins 1 (heat storage capacity = weight × temperature), thereby effectively improving the problem of temperature rise when the gas water heater is shut off, reducing the temperature rise when the water is shut off, and avoiding users from being scalded by the heated water when turning off the water and then turning on the water, thereby improving the user experience.

[0057] Optionally, the outlet of the heat exchange flow channel is arranged at the terminal heat exchange tube. Such arrangement can better ensure the heat exchange efficiency while saving materials, and can further reduce the heating temperature rise of the water in the terminal heat exchange tube by the heat exchange fin 1 during the water outage period, thereby reducing the water outage temperature rise. Optionally, the terminal heat exchange tube is connected to the hot water outlet pipe of the gas water heater.

[0058] Optionally, the inlet of the heat exchange channel can be determined according to actual conditions. For example, when multiple heat exchange tubes 2 are arranged in a row, the inlet of the heat exchange channel is set at the front heat exchange tube. At this time, the water temperature in the front heat exchange tube is relatively low, and the fin height of the heat exchange fin 1 corresponding to the front heat exchange tube is relatively high, which can increase the heat exchange area and improve the heating efficiency of water. Optionally, the front heat exchange tube is connected to the cold water inlet pipe of the gas water heater; when multiple heat exchange tubes 2 are arranged in two or more rows, the inlet of the heat exchange channel can be set on the front heat exchange tube or other heat exchange tubes 2 except the first row of heat exchange tubes. When the inlet is set on other heat exchange tubes 2 except the first row of heat exchange tubes, for the first row of heat exchange tubes, the water flow still enters from the front heat exchange tube, and the water temperature in the front heat exchange tube is lower than the water temperature in the terminal heat exchange tube. The fin height of the heat exchange fin 1 corresponding to the front heat exchange tube is relatively high, which can increase the heat exchange area and improve the heating efficiency of water.

[0059] See also Figure 3 , Figure 6 as well as Fig. 9 In some embodiments, the fin heights corresponding to the multiple heat exchange tubes 2 in the first row decrease from the front heat exchange tube to the end heat exchange tube. In this embodiment, among the fin heights corresponding to each two adjacent heat exchange tubes 2, the fin height corresponding to the heat exchange tube 2 located on the downstream side of the heat exchange flow channel is smaller than the fin height corresponding to the heat exchange tube 2 located on the upstream side of the heat exchange flow channel, that is, the fin heights corresponding to each heat exchange tube 2 in the first row decrease one by one. With such a design, the decreasing trend of the fin heights corresponding to the multiple heat exchange tubes 2 in the first row can roughly match the decreasing trend of the temperature difference between the water flow and the flue gas in the heat exchange tube 2, which can improve thermal efficiency and reduce material usage.

[0060] See also Figure 4 , Figure 5 , Figure 7 , Figure 8 as well as Fig.10 In some embodiments, in the direction from the front heat exchange tube to the rear heat exchange tube, the first row of heat exchange tubes includes at least a first group of heat exchange tubes (such as Figure 4 , Figure 5 , Figure 7 , Figure 8 as well as Fig.10 for installation in the first group of installation holes 111 of the heat exchange tube), the second group of heat exchange tubes (such as Figure 4 , Figure 5 , Figure 7 , Figure 8 as well as Fig.10 The fin height corresponding to the first group of heat exchange tubes is greater than the fin height corresponding to the second group of heat exchange tubes, and the fin height corresponding to the second group of heat exchange tubes is greater than the fin height corresponding to the terminal heat exchange tube. In this embodiment, in the direction from the front heat exchange tube to the terminal heat exchange tube, the fin height corresponding to the first group of heat exchange tubes, the fin height corresponding to the second group of heat exchange tubes, and the fin height corresponding to the terminal heat exchange tube are arranged in a decreasing manner, which can improve the heat exchange efficiency while reducing the amount of material used.

[0061] It should be noted that the first group of heat exchange tubes in this embodiment may include one, two or more heat exchange tubes 2. When only one heat exchange tube 2 is included, the first group of heat exchange tubes is the front heat exchange tube; when two or more heat exchange tubes 2 are included, the fin heights corresponding to at least two heat exchange tubes 2 in the first group of heat exchange tubes may be the same. It can be understood that in actual application, the temperature in the middle of the combustion heat exchange chamber of the gas water heater is higher than the temperature on the lateral sides. The first group of heat exchange tubes is located in the lateral side area of ​​the combustion heat exchange chamber, that is, the flue gas temperature at the location of the first group of heat exchange tubes is relatively low, and the water temperature in the first group of heat exchange tubes is in a relatively low state. Therefore, the fin height corresponding to the heat exchange tube 2 in the first group of heat exchange tubes can be set to be unchanged to increase the fin heat exchange area and heat the water quickly. Optionally, the first group of heat exchange tubes may include two, three, four or more heat exchange tubes 2.

[0062] The second group of heat exchange tubes may also include one, two or more heat exchange tubes 2. When two or more heat exchange tubes 2 are included, the fin heights corresponding to at least two heat exchange tubes 2 in the second group of heat exchange tubes are the same or set in decreasing order. It can be understood that in actual application, the temperature in the middle of the combustion heat exchange chamber of the gas water heater is higher than the temperature on both sides of the lateral direction. The second group of heat exchange tubes is roughly located in the middle area of ​​the combustion heat exchange chamber, that is, the flue gas temperature at the location of the second group of heat exchange tubes is relatively high, and the water temperature in the second group of heat exchange tubes may not be heated to a high enough level. At this time, the fin heights corresponding to at least two heat exchange tubes 2 in the second group of heat exchange tubes can be set to be unchanged to increase the fin heat exchange area and heat the water quickly; or, the water temperature in the second group of heat exchange tubes may have been heated to a high enough level, then the fin heights corresponding to at least two heat exchange tubes 2 in the second group of heat exchange tubes can be set in decreasing order to ensure the heat exchange efficiency while reducing the material consumption. Optionally, the second group of heat exchange tubes may include two, three, four or more heat exchange tubes 2.

[0063] The present invention also provides a gas water heater, see Fig.11 The gas water heater includes a combustion heat exchange chamber and a heat exchanger. The specific structure of the heat exchanger refers to the above embodiment. Since the gas water heater adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Among them, the heat exchanger is arranged in the combustion heat exchange chamber.

[0064] Optionally, the gas water heater also includes a fan 5. The gas water heater can be a forced-draft water heater, in which case the fan 5 is located above the heat exchanger and drives the airflow by negative pressure suction; or it can be a blower-type water heater, in which case the fan 5 is located below the combustion and heat exchange chamber and drives the airflow by blowing air.

[0065] 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 exchange fin, characterized in that: The heat exchange fin is provided with at least a first row of mounting holes close to the smoke inlet side, the area of ​​the heat exchange fin corresponding to the first row of mounting holes is the first area, the first area has a relative water inlet side and a water outlet side, wherein the mounting holes in the first row of mounting holes close to the water inlet side are the first mounting holes, and the mounting holes close to the water outlet side are the second mounting holes; The height of the smoke inlet side edge of the first region protruding from the hole wall of the first row of mounting holes is defined as the fin height, which satisfies: The fin height at the first mounting hole is greater than the fin height at the second mounting hole.

2. The heat exchange fin according to claim 1, characterized in that: The heights of the fins corresponding to the first row of mounting holes decrease successively from the first mounting hole to the second mounting hole.

3. The heat exchange fin according to claim 1, characterized in that: The height of the fins corresponding to the first row of mounting holes decreases intermittently from the first mounting hole to the second mounting hole.

4. The heat exchange fin according to claim 1, characterized in that: In the direction from the first mounting hole to the second mounting hole, the first row of mounting holes includes at least a first group of mounting holes, a second group of mounting holes, and the second mounting holes, the fin height corresponding to the first group of mounting holes is greater than the fin height corresponding to the second group of mounting holes, and the fin height corresponding to the second group of mounting holes is greater than the fin height corresponding to the second mounting holes.

5. The heat exchange fin according to claim 4, characterized in that: The first group of mounting holes includes at least two mounting holes, and the fins corresponding to the mounting holes in the first group of mounting holes have the same height or are arranged in decreasing order; Alternatively, the first group of mounting holes is the first mounting holes.

6. The heat exchange fin according to claim 4, characterized in that: The second group of mounting holes includes at least two mounting holes, and the fin heights corresponding to the mounting holes in the second group of mounting holes are the same or arranged in decreasing order.

7. The heat exchange fin according to any one of claims 1 to 6, characterized in that: A convex arc portion is formed on the smoke inlet side edge of the first region corresponding to the outer circumference of each mounting hole in the first row of mounting holes, and the convex arc portion is concentrically arranged with the corresponding mounting hole.

8. A heat exchanger, characterized in that: The heat exchange fin comprises the heat exchange fin according to any one of claims 1 to 7 and a heat exchange tube installed in a plurality of the installation holes, wherein the plurality of the heat exchange tubes are connected to form a heat exchange flow channel; Wherein, the heat exchange tube installed in the second installation hole is provided with an outlet of the heat exchange flow channel.

9. The heat exchanger according to claim 8, characterized in that The plurality of mounting holes are arranged in a single row, and the heat exchange tubes mounted in the first mounting holes are provided with inlets of the heat exchange channels; Alternatively, the plurality of mounting holes are arranged in at least two rows, and the inlet of the heat exchange channel is provided on a heat exchange tube installed in the first mounting hole or on a heat exchange tube at other mounting holes except the first row of mounting holes.

10. A heat exchanger, characterized in that: include: A plurality of heat exchange tubes are arranged in parallel and spaced apart to form at least one row, and are connected in series to form a heat exchange flow channel; wherein the row of heat exchange tubes close to the smoke inlet side is the first row of heat exchange tubes, the heat exchange tubes at the end of the heat exchange flow channel in the first row of heat exchange tubes are the end heat exchange tubes, and the heat exchange tubes at the front end of the heat exchange flow channel are the front end heat exchange tubes; and The heat exchange fins are sleeved on the outer circumference of the plurality of heat exchange tubes; the height of the smoke inlet side edge of the heat exchange fin protruding from the outer surface of the first row of heat exchange tubes is defined as the fin height, which satisfies: The height of the fins at the end heat exchange tube is smaller than the height of the fins at the front heat exchange tube.

11. The heat exchanger according to claim 10, characterized in that The fin heights corresponding to the plurality of heat exchange tubes in the first row decrease successively from the front heat exchange tube to the rear heat exchange tube.

12. The heat exchanger according to claim 10, characterized in that In the direction from the front end heat exchange tube to the terminal heat exchange tube, the first row of heat exchange tubes includes at least a first group of heat exchange tubes, a second group of heat exchange tubes and the terminal heat exchange tube, the fin height corresponding to the first group of heat exchange tubes is greater than the fin height corresponding to the second group of heat exchange tubes, and the fin height corresponding to the second group of heat exchange tubes is greater than the fin height corresponding to the terminal heat exchange tube.

13. The heat exchanger according to claim 12, characterized in that The first group of heat exchange tubes includes at least two heat exchange tubes, and the fins corresponding to the at least two heat exchange tubes in the first group of heat exchange tubes have the same height, or the first group of heat exchange tubes are the front end heat exchange tubes; And / or, the second group of heat exchange tubes includes at least two heat exchange tubes, and the fin heights corresponding to the at least two heat exchange tubes in the second group of heat exchange tubes are arranged in decreasing order.

14. The heat exchanger according to any one of claims 10 to 13, characterized in that The outlet of the heat exchange channel is arranged at the terminal heat exchange tube; And / or, the inlet of the heat exchange channel is arranged at the front end heat exchange tube.

15. A gas water heater, characterized in that: It comprises a combustion heat exchange chamber and a heat exchanger as claimed in any one of claims 8 to 14, wherein the heat exchanger is arranged in the combustion heat exchange chamber.

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