Heat exchanger and gas water heater

Abstract

The utility model provides a kind of heat exchanger and gas water heater, the heat exchanger includes main heat exchange structure and auxiliary heat exchange structure;The main heat exchange structure includes main heat exchange pipe;The auxiliary heat exchange structure is located below the main heat exchange structure;The auxiliary heat exchange structure includes auxiliary heat exchange pipe, and the water outlet of the auxiliary heat exchange pipe is connected with the water inlet of the main heat exchange pipe.The heat exchanger and gas water heater provided by the utility model can solve the problem of scale formation caused by delayed heat conduction due to local high temperature of the heat exchange tube of the heat exchanger.

Description

Technical Field

[0001] This utility model relates to the field of water heater technology, and in particular to a heat exchanger and a gas water heater. Background Technology

[0002] In recent years, major water heater manufacturers have tended to use irregularly shaped heat exchanger tubes (such as elliptical tubes and flat tubes) with larger surface areas to increase the heat exchange area and duration, thereby ensuring overall heat exchange efficiency. However, due to the relatively large vertical dimension of the tubes, irregularly shaped heat exchanger tubes can easily lead to localized high temperatures at the bottom (fire-facing zone) of the heat exchanger, resulting in uneven heating of the entire heat exchanger. Prolonged exposure to these localized high temperatures can cause scaling at the bottom of the heat exchanger tubes, ultimately leading to poor thermal conductivity, cracking, and leaks, thus affecting the product's lifespan.

[0003] Therefore, there is a need to provide an improved technical solution that addresses the shortcomings of the existing technology. Utility Model Content

[0004] The purpose of this invention is to provide a heat exchanger that can solve the problem of scaling caused by local high temperature in the heat exchange tubes, resulting in insufficient heat conduction.

[0005] The purpose of this utility model is to provide a gas water heater, which includes the above-mentioned heat exchanger, and can solve the problem of scaling caused by local high temperature in the heat exchange tubes of the heat exchanger, resulting in untimely heat conduction.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A heat exchanger includes a main heat exchange structure and an auxiliary heat exchange structure;

[0008] The main heat exchange structure includes a main heat exchange tube;

[0009] The auxiliary heat exchange structure is located below the main heat exchange structure; the auxiliary heat exchange structure includes an auxiliary heat exchange tube, and the outlet of the auxiliary heat exchange tube is connected to the inlet of the main heat exchange tube.

[0010] According to one embodiment of the present invention, the height dimension of the main heat exchange tube is greater than its width dimension.

[0011] According to one embodiment of the present invention, heat exchange fins are provided on the outer periphery of the main heat exchange tube.

[0012] According to one embodiment of the present invention, the heat exchange fins are provided with a baffle plate on the side between the two main heat exchange tubes.

[0013] According to one embodiment of the present invention, the water channels of both the main heat exchange tube and the auxiliary heat exchange tube are S-shaped.

[0014] According to one embodiment of the present invention, the water inlet of the auxiliary heat exchange tube is provided with a water inlet connector, and the water outlet of the main heat exchange tube is provided with a water outlet connector.

[0015] According to one embodiment of the present invention, the auxiliary heat exchange tube is a circular tube.

[0016] According to one embodiment of the present invention, both the main heat exchange tube and the auxiliary heat exchange tube are straight tubes, and there are multiple main heat exchange tubes and multiple auxiliary heat exchange tubes; both ends of the main heat exchange tube and the auxiliary heat exchange tube are provided with support plates, and the ends of the main heat exchange tube and the auxiliary heat exchange tube pass through the support plates; the support plates are provided with a first connecting sleeve and a second connecting sleeve; the main heat exchange tubes are connected end to end through the first connecting sleeve to form an S-shaped water channel, and the auxiliary heat exchange tubes are connected end to end through the second connecting sleeve to form an S-shaped water channel.

[0017] According to one embodiment of the present invention, the heat exchanger further includes a transition plate, the transition plate having through holes corresponding to the main heat exchange tube and the auxiliary heat exchange tube, a first transition portion corresponding to the main heat exchange tube and the auxiliary heat exchange tube on one side of the through hole, and a second transition portion corresponding to the first connecting sleeve and the second connecting sleeve on the other side of the through hole.

[0018] This utility model also provides a gas water heater, including the heat exchanger described above.

[0019] Compared with the prior art, the advantages and beneficial effects of the embodiments of this utility model are as follows:

[0020] The heat exchanger and gas water heater provided in this embodiment of the invention utilize an auxiliary heat exchange tube that absorbs some of the heat from the combustion flame and high-temperature flue gas, preventing the main heat exchange tube from directly facing the flame and flue gas and causing localized overheating and scaling. Furthermore, when water flows out of the auxiliary heat exchange tube and into the main heat exchange tube, the cold water undergoes one heat exchange in the auxiliary tube and then a second heat exchange in the main heat exchange tube, improving heat exchange efficiency. In summary, in this embodiment, an auxiliary heat exchange structure is provided below the main heat exchange structure and between it and the heating flame. This avoids the main heat exchange structure from being directly subjected to high-temperature impact, preventing localized high-temperature scaling on the main heat exchange tube. Additionally, the superposition of the two heat exchanges between the auxiliary and main heat exchange structures improves the energy efficiency output of the heat exchanger. Attached Figure Description

[0021] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an undue limitation of this utility model. Wherein:

[0022] Figure 1 A schematic diagram of the structure of a heat exchanger provided in an embodiment of this utility model;

[0023] Figure 2 A front view of a heat exchanger provided in an embodiment of this utility model;

[0024] Figure 3 for Figure 2 A cross-sectional view along the AA direction;

[0025] Figure 4 A schematic diagram of the heat exchange fins of the heat exchanger provided in an embodiment of this utility model;

[0026] Figure 5 A schematic diagram of the structure of the auxiliary heat exchange tube of the heat exchanger provided in the embodiment of this utility model;

[0027] Figure 6 A schematic diagram of the liquid flow direction inside the auxiliary heat exchange tube of the heat exchanger provided in this embodiment of the utility model;

[0028] Figure 7 A schematic diagram of the main heat exchange tube of the heat exchanger provided in an embodiment of this utility model;

[0029] Figure 8 A schematic diagram of the liquid flow direction in the main heat exchange tube of the heat exchanger provided in this embodiment of the utility model.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Main heat exchange structure; 11. Main heat exchange tube; 12. Heat exchange fins; 13. Baffle plate; 2. Auxiliary heat exchange structure; 21. Auxiliary heat exchange tube; 3. Water inlet connector; 4. Water outlet connector; 5. Support plate; 6. First connecting sleeve; 7. Second connecting sleeve; 8. Adapter plate; 81. First adapter part; 82. Second adapter part. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation of the present invention and not by way of limitation. In fact, those skilled in the art will recognize that modifications and variations can be made to the present invention without departing from the scope or spirit of the invention. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the present invention encompass such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0033] In the description of this utility model, the terms "first," "second," and similar words do not indicate any order, quantity, or importance, but are only used to distinguish different components. Words such as "comprising" or "including" mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects. Terms such as "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. The terms "connected," "linked," and "set up" used in this utility model should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a direct connection or an indirect connection through intermediate components; a wired connection, a radio connection, or a wireless communication signal connection. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0034] like Figures 1-3 As shown, this embodiment of the present invention provides a heat exchanger, including a main heat exchange structure 1 and an auxiliary heat exchange structure 2. The main heat exchange structure 1 includes a main heat exchange tube 11. The auxiliary heat exchange structure 2 is disposed below the main heat exchange structure 1, and the auxiliary heat exchange structure 2 includes an auxiliary heat exchange tube 21, the outlet of which is connected to the inlet of the main heat exchange tube 11.

[0035] like Figures 5-8As shown in the figure, in use, the heat exchanger provided in this embodiment of the present invention has an auxiliary heat exchange structure 2 disposed below the main heat exchange structure 1 and between it and the heating flame. The auxiliary heat exchange tube 21 of the auxiliary heat exchange structure 2 is connected to the main heat exchange tube 11 of the main heat exchange structure 1. Cold water enters through the inlet of the auxiliary heat exchange tube 21, flows through the auxiliary heat exchange tube 21 and then into the main heat exchange tube 11, and finally flows out from the outlet of the main heat exchange tube 11. During this process, the auxiliary heat exchange tube 21 absorbs some of the heat from the combustion of the flame and the high-temperature flue gas, avoiding the problem of local overheating and scaling of the main heat exchange tube 11 caused by the main heat exchange tube 11 directly facing the combustion flame and high-temperature flue gas. In addition, when the water flows out of the auxiliary heat exchange tube 21 and then enters the main heat exchange tube 11, the cold water undergoes one heat exchange in the auxiliary heat exchange tube 21 and then undergoes a second heat exchange in the main heat exchange tube 11, which improves the efficiency of heat exchange. In summary, in this embodiment, an auxiliary heat exchange structure 2 is provided below the main heat exchange structure 1 and between it and the heating flame. On the one hand, this can avoid the problem of local high-temperature scaling of the main heat exchange tube 11 caused by the direct impact of high temperature on the main heat exchange structure 1. On the other hand, the superposition of heat exchange between the auxiliary heat exchange structure 2 and the main heat exchange structure 1 can improve the output of the heat exchanger's energy efficiency.

[0036] To increase the heat exchange area and thus ensure the overall heat exchange efficiency output, such as Figure 1 , Figure 3 , Figure 4 As shown, in one embodiment of the present invention, the height dimension of the main heat exchange tube 11 is greater than the width dimension. For example, the main heat exchange tube 11 is an elliptical tube or a flat tube.

[0037] like Figures 1-4 As shown, in one embodiment of this utility model, the main heat exchange tube 11 is provided with heat exchange fins 12 on its outer periphery. The main heat exchange tube 11 and the heat exchange fins 12 are combined to form a finned tube structure with high-efficiency heat exchange, further improving the heat exchange efficiency. Figures 3-4 As shown, the heat exchange fin 12 is further provided with a baffle 13 on the side between the two main heat exchange tubes 11 to disturb the flow state of the high-temperature flue gas and further improve the efficiency of heat exchange.

[0038] To increase the heat exchange time and thus ensure the overall heat exchange efficiency output, such as Figures 5-8 As shown, in one embodiment of this utility model, the water channels of both the main heat exchanger tube 11 and the auxiliary heat exchanger tube 21 are S-shaped.

[0039] For connection to cold water pipes and hot water pipes, such as Figures 1-2 As shown, in one embodiment of the present invention, the water inlet of the auxiliary heat exchange tube 21 is provided with a water inlet connector 3, and the water outlet of the main heat exchange tube 11 is provided with a water outlet connector 4.

[0040] To ensure uniform heating of the auxiliary heat exchange tube 21, such as Figures 1-3 As shown, in one embodiment of this utility model, the auxiliary heat exchange tube 21 is a circular tube. Furthermore, to reduce the heat intensity of the auxiliary heat exchange tube 21, a bare tube heat exchange structure (without fins) is adopted to ensure that the water temperature at the bottom of the auxiliary heat exchange tube 21 is not affected by the fire-facing surface, thus preventing localized high temperatures and scaling. During the flow of cold water within the auxiliary heat exchange tube 21, some of the heat from the high-temperature flue gas is absorbed. Due to the absence of fins, the heat exchange intensity of the auxiliary heat exchange tube 21 is insufficient to cause the water flow to reach a high-temperature vaporization state, thus preventing high-temperature scaling. This also serves as a buffer for the heat exchange of the main heat exchange tube 11 above.

[0041] In order to improve heat exchange efficiency, in one embodiment of this utility model, both the main heat exchange tube 11 and the auxiliary heat exchange tube 21 are made of stainless steel.

[0042] like Figures 1-3 As shown, in one embodiment of this utility model, both the main heat exchange tube 11 and the auxiliary heat exchange tube 21 are straight tubes, and there are multiple main heat exchange tubes 11 and auxiliary heat exchange tubes 21. Support plates 5 are provided at both ends of the main heat exchange tube 11 and the auxiliary heat exchange tube 21, and the ends of the main heat exchange tube 11 and the auxiliary heat exchange tube 21 pass through the support plates 5. A first connecting sleeve 6 and a second connecting sleeve 7 are provided on the outer side of the support plate 5 (the side away from the main heat exchange tube 11 and the auxiliary heat exchange tube 21). The main heat exchange tubes 11 are connected end-to-end through the first connecting sleeve 6 to form an S-shaped water channel, and the auxiliary heat exchange tubes 21 are connected end-to-end through the second connecting sleeve 7 to form an S-shaped water channel, thereby increasing the heat exchange time and improving the heat exchange efficiency. Furthermore, to facilitate the connection of the first connecting sleeve 6 to the main heat exchange tube 11 and the second connecting sleeve 7 to the auxiliary heat exchange tube 21, the heat exchanger also includes a transition plate 8. The transition plate 8 has through holes corresponding to the main heat exchange tube 11 and the auxiliary heat exchange tube 21. One side of the through hole has a first transition portion 81 corresponding to the main heat exchange tube 11 and the auxiliary heat exchange tube 21, and the other side of the through hole has a second transition portion 82 corresponding to the first connecting sleeve 6 and the second connecting sleeve 7. The first transition portion 81 and / or the second transition portion 82 can be an outwardly protruding sleeve or an inwardly recessed slot.

[0043] This utility model also provides a gas water heater, including the heat exchanger described above.

[0044] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A heat exchanger, characterized by, It includes a main heat exchange structure (1) and an auxiliary heat exchange structure (2); The main heat exchange structure (1) includes a main heat exchange tube (11); The auxiliary heat exchange structure (2) is located below the main heat exchange structure (1); the auxiliary heat exchange structure (2) includes an auxiliary heat exchange tube (21), and the outlet of the auxiliary heat exchange tube (21) is connected to the inlet of the main heat exchange tube (11).

2. The heat exchanger of claim 1, wherein The height dimension of the main heat exchange tube (11) is greater than its width dimension.

3. The heat exchanger of claim 1, wherein, The main heat exchange tube (11) is provided with heat exchange fins (12) on its outer periphery.

4. The heat exchanger of claim 3, wherein The heat exchange fins (12) are provided with baffles (13) on the side between the two main heat exchange tubes (11).

5. The heat exchanger of claim 1, wherein The water channels of both the main heat exchanger tube (11) and the auxiliary heat exchanger tube (21) are S-shaped.

6. The heat exchanger of claim 1, wherein The auxiliary heat exchange tube (21) has an inlet connector (3) at its inlet and the main heat exchange tube (11) has an outlet connector (4) at its outlet.

7. The heat exchanger of claim 1, wherein The auxiliary heat exchange tube (21) is a round tube.

8. The heat exchanger according to any one of claims 1 to 7, characterized in that Both the main heat exchange tube (11) and the auxiliary heat exchange tube (21) are straight tubes, and there are multiple main heat exchange tubes (11) and auxiliary heat exchange tubes (21); both ends of the main heat exchange tube (11) and the auxiliary heat exchange tube (21) are provided with support plates (5), and the ends of the main heat exchange tube (11) and the auxiliary heat exchange tube (21) are inserted through the support plates (5); the support plates (5) are provided with a first connecting sleeve (6) and a second connecting sleeve (7); the main heat exchange tube (11) is connected end to end through the first connecting sleeve (6) to form an S-shaped water channel, and the auxiliary heat exchange tube (21) is connected end to end through the second connecting sleeve (7) to form an S-shaped water channel.

9. The heat exchanger of claim 8, wherein, It also includes a transition plate (8), which has through holes corresponding to the main heat exchange tube (11) and the auxiliary heat exchange tube (21). One side of the through hole has a first transition part (81) corresponding to the main heat exchange tube (11) and the auxiliary heat exchange tube (21), and the other side of the through hole has a second transition part (82) corresponding to the first connecting sleeve (6) and the second connecting sleeve (7).

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

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