Heat exchange tubes, heat exchangers and hot water equipment

Abstract

This application discloses a heat exchange tube, heat exchanger, and water heater. The heat exchange tube comprises a tube body and a plurality of fins fixedly mounted on the tube body. A flow guide structure is provided on a portion of the outer edges of the fins. A flue gas flow duct is formed between the flow guide structure and the outer wall of the tube body. The heat exchange tube, heat exchanger, and water heater provided herein can improve the flue gas flow path and enhance heat exchange efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of water heating equipment, and in particular to a heat exchange tube, a heat exchanger and a water heating equipment. Background Art

[0002] Currently, the heat exchanger of a gas water heater is equipped with heat exchange tubes that exchange heat with the flue gas. To increase the heat transfer area outside the tube and the heat transfer capacity of the heat exchange tube, the heat exchange tube is generally finned. Finned tubes are machined on the surface of the tube to expand the original surface, increase the heat transfer area, and increase the heat transfer capacity.

[0003] However, the gaps between the fins of the existing finned tubes are open to the outside, so that the flue gas flow does not fully contact the tube body, resulting in low heat exchange efficiency.

[0004] In addition, in order to improve the heat exchange efficiency of the finned tubes, some water heaters add a flue gas baffle on one side of the finned tubes to ensure sufficient contact between the flue gas and the finned tubes and prevent the flue gas from flowing too fast, thereby improving the heat exchange efficiency. However, this will lead to an increase in manufacturing costs. Moreover, the flue gas baffle needs to be installed on the side of the gap outlet between the two adjacent circles of finned tubes. The installation accuracy control is relatively difficult and the installation is difficult. However, if the installation position of the flue gas baffle is inaccurate, the heat exchange efficiency will be greatly affected. Summary of the Invention

[0005] In view of the above-mentioned deficiencies, one object of the present application is to provide a heat exchange tube, a heat exchanger and a water heater, so as to improve the flue gas flow path and enhance the heat exchange efficiency.

[0006] Another object of the present application is to provide a heat exchange tube, a heat exchanger, and a water heating device that can reduce costs and are easy to install.

[0007] To achieve at least one of the above objectives, this application adopts the following technical solutions:

[0008] A heat exchange tube comprises a tube body and a plurality of fins fixedly sleeved on the outside of the tube body; a flow guiding structure is provided on part of the outer edges of the fins; a flow guiding flue is formed between the flow guiding structure and the outer wall of the tube body.

[0009] As a preferred embodiment, the fin has a first part with the guide structure set on the outer edge and a second part without the guide structure set on the outer edge; when a part of the fin is cut off at the same central angle, the heat exchange area of ​​the part cut off by the first part is greater than the heat exchange area of ​​the part cut off by the second part.

[0010] As a preferred embodiment, when a portion of the fin is cut off at the same central angle, the difference between the heat exchange area of ​​the portion cut off by the first portion and the heat exchange area of ​​the portion cut off by the second portion is approximately the heat exchange area of ​​the guide structure of the cut off portion.

[0011] As a preferred embodiment, at least part of the length of the guide structure has a preset width; the width direction is the spacing direction of two adjacent fins; the preset width is greater than 0.9 times the spacing between two adjacent fins.

[0012] As a preferred embodiment, among two adjacent fins, the guide structure of one fin is in contact with and fits with the other fin.

[0013] As a preferred embodiment, the ratio of the fitting length of the guide structure to the entire length of the guide structure is greater than 0.8.

[0014] As a preferred embodiment, the width of at least a portion of the flow-guiding structure remains unchanged when it extends around the tube body.

[0015] As a preferred embodiment, when at least a portion of the length of the flue gas guide extends around the tube body, the flow area remains unchanged.

[0016] As a preferred embodiment, the distance between the outer edge of the fin where the guide structure is not provided and the outer wall of the tube body is L1, and the distance between the guide structure and the tube body is L2, wherein 0.5L1≤L2≤1.5L1.

[0017] As a preferred embodiment, a flue gas inlet and a flue gas outlet communicated with the guide flue are provided between two adjacent fins; wherein the heat exchange tube has an upstream side facing the flue gas and a downstream side facing away from the flue gas; the flue gas outlet is located on the downstream side, and the guide structure is located on both circumferential sides of the flue gas outlet.

[0018] As a preferred embodiment, the lengths of the guide structures located on both sides of the flue gas outlet are equal.

[0019] As a preferred embodiment, the smoke inlet is located on the upstream side; the length of the smoke inlet along the circumferential direction is greater than that of the smoke outlet.

[0020] As a preferred embodiment, more than half of the length of the flow-guiding structure is located on the back-stream side.

[0021] As a preferred embodiment, the flow-guiding structure extends along the circumferential direction.

[0022] As a preferred embodiment, the flow-guiding structure and the fin are an integrated structure, and the flow-guiding structure is a flow-guiding flange located at the outer edge of the fin.

[0023] As a preferred embodiment, the circumferential length of the flue gas inlet is less than half of the circumference of the outer edge of the fin.

[0024] As a preferred embodiment, the distance between the guide structure and the tube body is L2; ​​along the direction around the tube body, the length of the smoke outlet is 0.5L2-3L2. (Is there a ratio range?)

[0025] As a preferred embodiment, along the direction around the tube body, the ratio of the length of the flow-guiding flange to the length of the outer edge of the fin is 0.3-0.7.

[0026] As a preferred embodiment, on the tube body, the smoke outlets of the first number of fins are aligned along the arrangement direction; the smoke outlets of the second number of fins are aligned along the arrangement direction and staggered with the smoke outlets of the first number in the circumferential direction.

[0027] As a preferred embodiment, the smoke outlets of the first number of fins and the smoke outlets of the second number of fins are staggered by 90 degrees in the circumferential direction.

[0028] A heat exchanger, a spirally coiled heat exchange tube; the heat exchange tube includes a tube body and a plurality of fins fixedly sleeved outside the tube body; a flow guide structure is provided on part of the outer edge of the fin; a flow guide flue is formed between the flow guide structure and the outer wall of the tube body.

[0029] As a preferred embodiment, outer edges of the fins of two adjacent circles of the heat exchange tubes are in contact with each other.

[0030] As a preferred embodiment, the heat exchange tube includes an inner coil and an outer coil surrounding the inner coil; a partition plate is provided between the inner coil and the outer coil; and the flue gas outlet of the guide flue of the inner coil faces the partition plate.

[0031] As a preferred embodiment, the outer coil is spirally wound around a central axis; the direction of the smoke outlet of the outer coil is parallel to the central axis.

[0032] As a preferred embodiment, in the outer coil, the flue gas outlet of the flue gas guide duct of one circle of heat exchange tubes faces the flue gas inlet of the flue gas guide duct of the next circle of heat exchange tubes.

[0033] A water heating device, comprising: a heat exchanger as described in any one of the above embodiments.

[0034] Beneficial effects:

[0035] A heat exchange tube provided in one embodiment of the present application utilizes a guide structure on the fins to form a guide flue, which can guide the flue gas to the tube surface of the heat exchange tube, preventing the flue gas from diffusing outward between the fins, thereby improving the heat exchange efficiency of the heat exchange tube.

[0036] In addition, the heat exchange tube provided by this embodiment does not require the installation of a smoke baffle in the heat exchanger, which reduces the difficulty of installation and is very practical.

[0037] With reference to the following description and the accompanying drawings, the specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be employed. It should be understood that the embodiments of the present invention are not limited in scope thereby.

[0038] Features described and / or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0039] It should be emphasized that the term "include / comprising" when used herein refers to the presence of features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative labor.

[0041] Figure 1 is a cross-sectional view of a heat exchanger provided in one embodiment of the present application;

[0042] Figure 2 yes Figure 1 Schematic diagram of heat exchange tubes;

[0043] Figure 3 yes Figure 2 sectional view of

[0044] Figure 4 yes Figure 2 Schematic diagram of the fin structure;

[0045] Figure 5 yes Figure 4 The main view;

[0046] Figure 6 yes Figure 1 Schematic diagram of the exterior of some heat exchange tubes;

[0047] Figure 7 yes Figure 6 Another view of;

[0048] Figure 8 yes Figure 2 Flue gas flow path diagram of the inner coil;

[0049] Figure 9 yes Figure 2 Diagram of the flue gas flow path of the outer coil. DETAILED DESCRIPTION

[0050] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts should fall within the scope of protection of the present invention.

[0051] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be another element centered thereon. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be another element centered thereon. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0053] See also Figures 1 to 9 One embodiment of the present application provides a heat exchange tube 500, comprising a tube body 20 and a plurality of fins 1 fixedly mounted on the outside of the tube body 20. A flow guide structure 3 is provided on a portion of the outer edge 8 of the fin 1; a flow guide duct 6 is formed between the flow guide structure 3 and the outer wall of the tube body 20.

[0054] The heat exchange tube 500 provided in this embodiment utilizes the guide structure 3 on the fin 1 to form a guide flue 6, which can guide the flue gas to the surface of the tube body 20 of the heat exchange tube 500, preventing the flue gas from diffusing outward between the fins 1, thereby improving the heat exchange efficiency of the heat exchange tube 500.

[0055] In addition, the use of the heat exchange tube 500 provided in this embodiment eliminates the need to install a smoke baffle in the heat exchanger, thereby reducing installation difficulty and being very practical.

[0056] In this embodiment, if Figure 4 、 Figure 5 As shown, the fin 1 may include an annular body 2 and a flow-guiding structure 3 located on a portion of the outer edge 8 of the annular body 2. The annular body 2 is preferably circular, but may also be other shapes, such as a rectangular ring or other polygonal ring. The surfaces of the annular bodies 2 of two adjacent fins 1 are parallel and may be substantially perpendicular to the outer surface of the tube 20.

[0057] A gap is formed between two adjacent annular bodies 2, and the guide structure 3 covers the gap at the outer edge 8 of the annular body 2. Thus, the guide structure 3, the walls of the two adjacent annular bodies 2, and the outer wall of the tube body 20 can enclose and form a guide flue duct 6. The guide structure 3 prevents smoke from entering the guide flue duct 6 and diffusing outward, ensuring that the smoke exchanges heat with the fins 1 and the tube body 20 as much as possible, thereby improving heat exchange efficiency.

[0058] In this embodiment, the guide structure 3 extends along the outer edge 8 of the annular body 2. The guide structure 3 and the annular body 2 can form a bent structure. The guide structure 3 and the annular body 2 can be perpendicular to each other. Of course, they can also be acute angles or obtuse angles. This application does not make any special limitations.

[0059] like Figure 4 、 Figure 5 As shown, the guide structure 3 extends in the circumferential direction. The guide structure 3 is an arc-shaped structure, extending in the circumferential direction at the outer edge 8 of the annular body 2. At this time, the guide structure 3 is in the form of a rectangular strip when laid flat. The guide structure 3 and the fin 1 are an integral structure, and the guide structure 3 is a guide flange located at the outer edge 8 of the fin 1. Preferably, the fin 1 is stamped. In other embodiments, the guide structure 3 can also be a non-flange structure, which can be a shielding strip welded to the outer edge 8 of the annular body 2.

[0060] The fin 1 also has an inner ring 7, one end of which has a plurality of positioning protrusions 9 along the circumferential direction. Figure 4 、 Figure 5As shown, the inner ring 7 of the fin 1 has three positioning protrusions 9. These positioning protrusions 9 can be used to position two adjacent fins 1, ensuring a target spacing between them. Of course, adjacent fins 1 of the heat exchange tube 500 of this embodiment can also be positioned by the flow guide structure 3. The fins 1 can be positioned on the tube body 20 using the flow guide structure 3 in conjunction with the inner ring 7 to provide dual positioning protrusions 9, ensuring accurate positioning between adjacent fins 1 and facilitating installation.

[0061] The fins of this embodiment can increase the heat exchange area of ​​the fin 1 by adding the guide structure 3, thereby improving the heat exchange efficiency of the heat exchange tube 500. Specifically, the fin 1 has a first portion with the guide structure 3 disposed on the outer edge 8, and a second portion without the guide structure 3 disposed on the outer edge 8. When a portion of the fin 1 is cut at the same central angle α, the heat exchange area of ​​the portion cut by the first portion is greater than the heat exchange area of ​​the portion cut by the second portion.

[0062] Furthermore, when a portion of the fin 1 is cut off at the same central angle, the difference between the heat exchange area of ​​the portion cut off by the first portion and the heat exchange area of ​​the portion cut off by the second portion is approximately the heat exchange area of ​​the guide structure 3 of the cut off portion.

[0063] For ease of understanding, the following examples are given: Figure 5 As shown, taking the interception of a central angle of 30 degrees (α=30 degrees) as an example, compared with the interception of the first part and the interception of the second part, a part (corresponding to the central angle of 30 degrees) of the guide structure 3 is added. Accordingly, the heat exchange area of ​​this part of the guide structure 3 will be increased, thereby improving the heat exchange efficiency.

[0064] In this embodiment, at least part of the length of the guide structure 3 has a preset width. The width direction is the spacing direction of two adjacent fins 1. Figure 7 The middle is the H direction. The flue gas guide duct 6 is generally a closed flow channel except for the flue gas inlet 4 and the flue gas outlet 5, which prevents the flue gas from overflowing during the flow of the flue gas guide duct 6 and ensures the heat exchange efficiency of the heat exchange tube 500.

[0065] In order to form a closed flow channel and prevent smoke from overflowing, the preset width is greater than 0.9 times the distance between two adjacent fins 1. Of course, the width direction of the guide structure 3 can also be the extension direction / length direction of the tube body 20. Figure 7 The length direction of the flow guiding structure 3 is along the direction around the tube body 20 and perpendicular to its width direction. In the case that the fin 1 has a circular body, the length direction of the flow guiding structure 3 may be along the circumferential direction.

[0066] Among them, the preset width can be a range value or a certain value, which can be understood as: the width of the partial length of the guide structure 3 changes when extending in the circumferential direction, for example, the width of at least a partial length of the guide structure 3 varies between 0.9LL (L is the distance between the two fins 1). Or, the width of at least a partial length of the guide structure 3 remains unchanged when extending around the tube body 20. For example, the width of the guide structure 3 of the entire length is L, and when the guide structure 3 is flattened, its shape is a rectangular strip. The at least partial length can be more than 0.5 times the total length of the guide structure 3. Furthermore, in this embodiment, the guide structure 3 of the entire length has a preset width, which is equal to the distance between the two fins 1.

[0067] Of course, in other embodiments, the width of the flow-guiding structure 3 may even be greater than the distance between two fins 1 , and the flow-guiding structure 3 may be placed on adjacent fins 1 .

[0068] In this embodiment, between two adjacent fins 1, the guide structure 3 of one fin 1 is in contact with and fits against the other fin 1. This minimizes smoke overflow, improves heat exchange efficiency, and forms a closed flue gas duct 6. Furthermore, the fit of the guide structure 3 with the fin 1 allows for positioning during installation, facilitating fin installation. To ensure that smoke flows around the tube body 20 as much as possible and avoids outward diffusion, the length of the guide structure 3 that fits the entire length of the guide structure 3 is greater than 0.8. Preferably, the entire length of the guide structure 3 fits against the fin 1.

[0069] In order to avoid increasing the flow resistance of the flue gas, the flow area remains unchanged when at least part of the length of the flue gas guide duct 6 extends around the tube body 20. When extending around the tube body 20, the radial size of the flue gas guide duct 6 does not change. Figure 5 As shown, the distance between the outer edge 8 of the fin 1 without the guide structure 3 and the outer wall of the tube body 20 is L1, and the distance between the guide structure 3 and the tube body 20 is L2, where 0.5L1≤L2≤1.5L1. In this embodiment, the distance between the guide structure 3 and the tube body 20 is equal to the distance between the outer edge 8 of the fin 1 without the guide structure 3 and the outer wall of the tube body 20, that is, L2=L1.

[0070] like Figure 6 、 Figure 7As shown, a flue gas inlet 4 and a flue gas outlet 5, communicating with the flue gas guide duct 6, are located between two adjacent fins 1. The outer edges of two adjacent fins 1, not provided with the guide structure 3, contribute to the formation of the flue gas inlet 4. The heat exchange tube 500 has an upstream side 10 facing the flue gas and a downstream side 11 facing away from the flue gas. The flue gas outlet 5 is located on the downstream side 11, the flue gas inlet 4 is located on the upstream side 10, and the guide structure 3 is located on both circumferential sides of the flue gas outlet 5. The guide structures 3 located on both circumferential sides of the flue gas outlet 5 are of equal length.

[0071] For the upstream side 10 of the heat exchange tube 500, the flue gas flows toward its surface, thereby having a better heat exchange effect. However, for the downstream side 11, in the case where the guide structure 3 is not provided, the flue gas continues to flow forward after passing through the upstream side 10 and is difficult to contact and exchange heat with the downstream side 11, resulting in poor heat exchange effect on the downstream side 11. In this embodiment, the guide structure 3 and the guide flue 6 formed therein are provided, so that the flue gas enters the guide flue 6 after passing through the upstream side 10 instead of freely flowing and diffusing. During the flow of the guide flue 6, the flue gas exchanges heat with the fins 1 and the tube body 20, thereby improving the overall heat exchange efficiency of the heat exchange tube 500. Among them, the guide structure 6 covers more than half of the downstream side in the direction surrounding the tube body 20. Correspondingly, the guide flue 6 covers more than half of the downstream side 11 in the direction surrounding the tube body 20. Combined with Figure 5 、 Figure 6 As shown, the portion of the backflow side 11 except the smoke outlet 5 is covered with the flow guiding structure 3 .

[0072] Continuing from the above description, the flue gas inlet 4 is located on the upstream side 10. The length of the flue gas inlet 4 in the circumferential direction is greater than that of the flue gas outlet 5. More than half of the length of the guide structure 3 is located on the downstream side 11. Taking the tube body 20 as a circular tube as an example, half of the tube body 20 is the upstream side 10 (corresponding to a central angle of 180 degrees), and the other half is the downstream side 11. Preferably, all the guide structures 3 are located on the downstream side 11, the flue gas inlet 4 is located on the upstream side 10, and the central angle covered is also 180 degrees. In order to enhance the smoke gathering and guiding effect, the length of the flue gas inlet 4 in the circumferential direction (circumferential direction) is less than half of the circumference of the outer edge 8 of the fin 1. In this embodiment, the length of the flue gas inlet 4 in the circumferential direction is half of the circumference of the outer edge 8 of the fin 1.

[0073] In this embodiment, the distance between the guide structure 3 and the tube body is L2; ​​along the direction around the tube body 20, the length of the smoke outlet 5 is 0.5L2-3L2 (0.5 times L2 to 3 times L2). For example: along the direction around the tube body 20, the length of the smoke outlet 5 is 3mm-10mm. The smoke outlet 5 is located between two guide flanges (guide structure 3). The guide structure 3 is constructed between the smoke outlet 5 and the smoke inlet 4 to form a guide flue 6 that connects the smoke outlet 5 and the smoke inlet 4. Along the direction around the tube body 20, the ratio of the length of the guide structure 3 to the length of the outer edge 8 of the fin 1 is 0.3-0.7. Preferably, the distance between the guide structure and the tube body is L2; ​​along the direction around the tube body, the length of the smoke outlet is 0.5L2-3L2, which is above 0.5.

[0074] On the tube body 20, the flue gas outlets 5 of the first number of fins 1 are aligned along the arrangement direction. The flue gas outlets 5 of the second number of fins 1 are aligned along the arrangement direction and are staggered in the circumferential direction with the flue gas outlets 5 of the first number of fins 1. Specifically, the flue gas outlets 5 of the first number of fins 1 and the flue gas outlets 5 of the second number of fins 1 are staggered 90 degrees in the circumferential direction. When the heat exchange tube 500 is coiled, the heat exchange tubes corresponding to the length of the first number of fins 1 can form the inner coil, and the heat exchange tubes corresponding to the length of the second number of fins 1 can form the outer coil.

[0075] Based on the same concept, embodiments of the present invention also provide a heat exchanger and water heater, as described in the following embodiments. Because the principles and technical effects achieved by these heat exchangers and water heaters are similar to those of the heat exchange tube 500, their implementation can be referenced to the implementation of the heat exchange tube 500, and any repetitions will not be repeated.

[0076] Please continue reading Figures 1 to 9 . One embodiment of the present application also provides a heat exchanger, a spirally coiled heat exchange tube 500. The heat exchange tube 500 includes a tube body 20 and a plurality of fins 1 fixedly mounted on the outside of the tube body 20. A guide structure 3 is provided on a portion of the outer edge 8 of the fin 1; a guide flue 6 is formed between the guide structure 3 and the outer wall of the tube body 20. The heat exchange tube 500 can adopt the heat exchange tube 500 described in any of the above embodiments, and the repeated parts will not be repeated.

[0077] To prevent flue gas from escaping between the heat exchange tubes 500 and facilitate its entry into the flue gas duct 6, the outer edges 8 of the fins 1 of two adjacent coils of heat exchange tubes 500 are aligned. The alignment location on the inner coil 300 can be the end of the flow-guiding structure 3 or the boundary between the flow-guiding structure 3 and the flue gas inlet 4. This prevents the formation of additional flue gas exhaust paths between two adjacent coils of heat exchange tubes 500, ensuring that the flue gas, after passing through the flue gas inlet 4, enters the flue gas duct 6 as fully as possible. This allows the entire flue gas to participate in heat exchange between the tube body 20 and the fins 1 on the back side 11, thereby improving heat exchange efficiency.

[0078] In this embodiment, if Figure 1 、 Figure 2 、 Figure 3 As shown, the heat exchange tube 500 includes an inner coil 300 and an outer coil 400 surrounding the inner coil 300. A partition plate 600 is provided between the inner coil 300 and the outer coil 400. The flue gas outlet 5 of the flue gas guide duct 6 of the inner coil 300 faces the partition plate 600. The partition plate 600 can be used to divide the heat exchange tube 500 of the heat exchanger into a combustion section and a condensation section.

[0079] The heat exchanger has a shell 100, which is generally hollow and cylindrical. The partition plate 600 is a cylindrical structure in the shell 100 and is located between the outer coil 400 and the inner coil 300. A smoke exhaust port 700 is provided on the side wall of the shell 100. The smoke exhaust port 700 is approximately located at one end of the shell 100 and leads to the interior of the shell 100. An external space for accommodating the outer coil 400 is formed between the partition plate 600 and the shell 100. In order to prevent the flue gas from flowing outside the heat exchange tube 500 and to make the flue gas flow in the guide flue 6 as much as possible to improve the heat exchange effect, the distance between the shell 100 and the partition plate 600 can be equal to the outer diameter of the heat exchange tube 500 (the outer diameter of the outer edge 8 of the fin 1). The outer coil 400 is in contact with the inner wall of the shell 100 and the outer wall of the partition plate 600.

[0080] The outer coil 400 is spirally wound around a central axis. Correspondingly, the inner coil 300 is also spirally wound around the central axis. The direction of the smoke outlet 5 of the outer coil 400 is parallel to the central axis. Specifically, in the outer coil 400, the smoke outlet 5 of the flue gas guide 6 of one circle of heat exchange tubes 500 faces the smoke inlet 4 of the flue gas guide 6 of the next circle of heat exchange tubes 500. The direction of the smoke outlet 5 of the outer spiral coil is perpendicular to the direction of the smoke outlet 5 of the inner coil 300. The direction of the smoke outlet 5 of the inner coil 300 is perpendicular to the partition plate 600. The direction of the smoke outlet 5 of the outer coil 400 is parallel to the partition plate 600.

[0081] The partition plate 600 in the heat exchanger of this embodiment only needs to be placed between the outer coil 400 and the inner coil 300, which is relatively easy to install. The inner coil 300 is inside the combustion chamber 200, and the inner coil 300 surrounds the combustion chamber 200. The flue gas flows outward from the inner coil 300, wherein the opening of the flue gas inlet 4 faces inward and the opening of the flue gas outlet 5 faces outward. The flue gas first enters the upper and lower sides (facing the inner coil 300) through the flue gas inlet 4. Figure 8 The flue gas guide 6 (in the direction of the flue gas when the flue gas is flowing) prevents outward diffusion while allowing the flue gas to flow around the tube body 20 and fully exchange heat with the tube body 20 and fins 1, thereby improving heat exchange efficiency. As the flue gas is discharged from the flue gas outlet 5, it can be seen that most of the tube body 20 has been in contact with the flue gas for heat exchange, preventing uneven heat exchange between the upstream side 10 and the downstream side 11 of the tube body 20, which would result in a large temperature difference and affect heat exchange efficiency.

[0082] In this embodiment, if Figure 8 、 Figure 9 As shown, a flue gas flow gap 601 is formed between the partition plate 600 and the inner coil 300. After being discharged from the flue gas outlet 5, the flue gas enters the flue gas flow gap 601 and flows downward to the flue gas guide 6 of the bottom heat exchange tube 500. The flue gas then enters the flue gas guide 6 of the bottom heat exchange tube 500 through the flue gas outlet 5 of the bottom heat exchange tube 500. The flue gas then flows through the flue gas guide 6 around the tube body 20 and out through the flue gas outlet 5. The flue gas outlet 5 is located opposite the center of the flue gas inlet 4 of the next circle of heat exchange tubes 500. The flue gas discharged from the flue gas outlet 5 enters the flue gas inlet 4 and flows around the tube body 20 to both sides until it enters the flue gas guide 6 and is discharged from the flue gas outlet 5. The flue gas then flows step by step until it exits the uppermost heat exchange tube 500 and finally exits the heat exchanger through the exhaust port 700.

[0083] One embodiment of the present application further provides a water heater, comprising: a heat exchanger as described in any of the above embodiments. The water heater may be a gas water heater, more specifically a gas water heater, a wall-mounted boiler, a condensing water heater, or a heating furnace.

[0084] Any numerical value cited herein includes all values ​​of the lower and upper values ​​in increments of one unit from the lower limit to the upper limit, and there is an interval of at least two units between any lower value and any higher value. For example, if the value of the quantity of a component or a process variable (such as temperature, pressure, time, etc.) is set forth to be from 1 to 90, preferably from 20 to 80, more preferably from 30 to 70, the purpose is to illustrate that values ​​such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also explicitly listed in this specification. For values ​​less than 1, one unit is appropriately considered to be 0.0001, 0.001, 0.01, 0.1. These are merely examples that are intended to be clearly expressed, and it can be considered that all possible combinations of the numerical values ​​listed between the minimum and maximum values ​​are explicitly set forth in this specification in a similar manner.

[0085] Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. When used with a range, "about" or "approximately" applies to both endpoints of the range. Thus, "about 20 to 30" is intended to cover "about 20 to about 30," including at least the specified endpoints.

[0086] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for all purposes. The term "consisting essentially of..." when describing a combination should include the identified elements, ingredients, components, or steps and other elements, ingredients, components, or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe a combination of elements, ingredients, components, or steps herein also contemplates embodiments consisting essentially of these elements, ingredients, components, or steps. By using the term "may," it is intended to indicate that any attribute described as "may" be optional.

[0087] Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, part or step is not intended to exclude other elements, ingredients, parts or steps.

[0088] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the appended claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein from the foregoing claims is not intended to be a disclaimer of such subject matter, nor should it be assumed that the inventors did not consider such subject matter to be part of the disclosed inventive subject matter.

Claims

1. A heat exchanger, characterized in that:

18. The heat exchanger as claimed in claim 17, wherein the heat exchanger comprises a spirally wound heat exchange tube; the heat exchange tube comprises a tube body and a plurality of fins fixedly sleeved on the tube body; a flow guide structure is provided on part of the outer edge of the fin; a flow guide flue is formed between the flow guide structure and the outer wall of the tube body, and a flue gas inlet and a flue gas outlet are provided between two adjacent fins; wherein the heat exchange tube has an upstream side facing the flue gas and a downstream side facing away from the flue gas; the flue gas outlet is located on the downstream side, and the flow guide structure is located on both sides of the flue gas outlet in the circumferential direction; among two adjacent fins, the flow guide structure of one fin is in contact with and fits with the other fin, the circumferential length of the flue gas inlet is less than half of the circumference of the outer edge of the fin, and the flue gas guide duct is a closed flow channel except for the flue gas inlet and the flue gas outlet; On the tube body, the flue gas outlets of the first number of fins are aligned along the arrangement direction; the outer edges of the fins of two adjacent circles of heat exchange tubes are in contact with each other, the heat exchange tubes of the length corresponding to the first number of fins form an inner coil, and the heat exchange tubes of the length corresponding to the second number of fins form an outer coil; on the tube body, the flue gas outlets of the second number of fins are aligned along the arrangement direction and are staggered in the circumferential direction with the flue gas outlets of the first number of fins; There is a partition plate between the inner coil and the outer coil, the smoke outlet of the guide flue of the inner coil faces the partition plate, and the outer coil is spirally coiled around a central axis; the smoke outlet of the outer coil is parallel to the central axis.

2. The heat exchanger according to claim 1, characterized in that The fin has a first portion with the guide structure set on the outer edge and a second portion without the guide structure set on the outer edge; when a portion of the fin is cut off at the same central angle, the heat exchange area of ​​the portion cut off by the first portion is larger than the heat exchange area of ​​the portion cut off by the second portion.

3. The heat exchanger according to claim 2, characterized in that When a portion of the fin is cut off at the same central angle, the difference between the heat exchange area of ​​the portion cut off by the first portion and the heat exchange area of ​​the portion cut off by the second portion is approximately the heat exchange area of ​​the guide structure of the cut off portion.

4. The heat exchanger according to claim 1, wherein At least part of the length of the guide structure has a preset width; the width direction is the distance between two adjacent fins; the preset width is greater than 0.9 times the distance between two adjacent fins.

5. The heat exchanger according to claim 4, characterized in that The ratio of the fitted length of the guide structure to the entire length of the guide structure is greater than 0.

8.

6. The heat exchanger according to claim 1, wherein The width of at least a portion of the flow-guiding structure remains unchanged when it extends around the tube body.

7. The heat exchanger according to claim 1, wherein When at least a portion of the length of the flue gas guide duct extends around the tube body, the flow area remains unchanged.

8. The heat exchanger according to claim 1, wherein The distance between the outer edge of the fin where the flow guide structure is not provided and the outer wall of the tube body is L1, and the distance between the flow guide structure and the tube body is L2, wherein 0.5L1≤L2≤1.5L1.

9. The heat exchanger according to claim 1, wherein The lengths of the flow-guiding structures located on both sides of the flue gas outlet are equal.

10. The heat exchanger according to claim 1, wherein The smoke inlet is located on the upstream side; the length of the smoke inlet along the circumferential direction is greater than that of the smoke outlet.

11. The heat exchanger according to claim 1, wherein More than half of the length of the flow-guiding structure is located on the back-stream side.

12. The heat exchanger according to claim 1, wherein The flow guiding structure extends along the circumferential direction.

13. The heat exchanger according to claim 1, wherein The flow-guiding structure and the fin are an integrated structure, and the flow-guiding structure is a flow-guiding flange located at the outer edge of the fin.

14. The heat exchanger according to claim 1, wherein The distance between the guide structure and the tube body is L2; ​​along the direction around the tube body, the length of the smoke outlet is 0.5L2-3L2.

15. The heat exchanger according to claim 1, wherein Along the direction around the tube body, the ratio of the length of the flow-guiding flange to the length of the outer edge of the fin is 0.3-0.

7.

16. The heat exchanger according to claim 1, wherein The smoke outlets of the first number of fins and the smoke outlets of the second number of fins are staggered by 90 degrees in the circumferential direction.

17. The heat exchanger according to claim 1, wherein In the outer coil, the flue gas outlet of the flue gas guide duct of one circle of heat exchange tubes faces the flue gas inlet of the flue gas guide duct of the next circle of heat exchange tubes.

18. A water heating device, characterized in that: include: A heat exchanger according to any one of claims 1 to 17.

Images