Fin, combustion heat exchange assembly and gas water heater

Abstract

The utility model relates to the technical field of household appliances, in particular to a fin, a combustion heat exchange assembly and a gas water heater, the fin comprises a fin body, the fin body is provided with at least two pipe insertion holes used for allowing heat exchange pipelines to be inserted, and the pipe insertion holes are arranged at intervals in the transverse direction; one side face of the fin body is provided with a protruding smoke blocking part, the smoke blocking part is arranged in the middle area of the two pipe inserting holes, and the lower end face of the smoke blocking part extends in an arc shape to form a first flow guiding face, a second flow guiding face, a third flow guiding face and a fourth flow guiding face, and the second flow guide surface is used for partially guiding the smoke flowing from bottom to top to the upper end part of the other pipe insertion hole. According to the fin capable of improving the heat exchange effect, the combustion heat exchange assembly which is provided with the fin and capable of improving the heating effect and the gas water heater are formed.

Description

Technical Field

[0001] This utility model relates to the field of household appliance technology, and more specifically to fins, combustion heat exchange components and gas water heaters. Background Technology

[0002] A gas water heater is a household appliance that uses the combustion of gas to generate heat to heat cold water.

[0003] Existing gas water heaters mainly consist of: a combustion heat exchange assembly for heating cold water (including a combustion assembly for forming a high-temperature flame and a heat exchanger with water pipes for transferring high temperature to the cold water in the pipes), a fan assembly for promoting air circulation, and other piping and electrical components. To improve the heat exchange effect and efficiency of the combustion heat exchange assembly, existing fins are often incorporated to contact the hot airflow and transfer heat to the water pipes; however, the heat exchange effect of these fins still needs improvement. Utility Model Content

[0004] One of the purposes of this invention is to address the shortcomings of existing technologies by providing fins that can improve heat exchange efficiency.

[0005] The second objective of this utility model is to provide a combustion heat exchange assembly having the aforementioned fins.

[0006] The third objective of this utility model is to provide a gas water heater having the aforementioned fins or combustion heat exchange components.

[0007] The technical solution of this utility model is as follows:

[0008] Fins, including:

[0009] The fin body is provided with insertion holes for inserting heat exchange pipes, and there are at least two insertion holes arranged at intervals in the transverse direction.

[0010] One side of the fin body has a protruding smoke-blocking portion, which is located in the middle area of ​​the two insertion holes, and the lower end face of the smoke-blocking portion extends in an arc shape.

[0011] The flue gas flowing from bottom to top is guided to the first guide surface at the upper end of an insertion port;

[0012] In addition, a portion of the flue gas flowing from bottom to top is guided to a second guide surface at the upper end of another insertion port.

[0013] In some designs, one side of the fin body also has a protruding baffle, which is positioned above the insertion port.

[0014] In some designs, the fin body has an overflow notch positioned above the insertion port and facing upwards;

[0015] The flow-blocking parts are placed on both sides of the opening of the overflow notch.

[0016] In some designs, the flow-blocking section and the smoke-blocking section are separated by an outlet for the supply of flue gas.

[0017] In some designs, both ends of the fin body have a flow-limiting portion that protrudes from one side of the fin body and extends vertically.

[0018] The insertion port is located between the two flow-limiting parts.

[0019] In some designs, the wall of the insertion port extends by forming a raised extension wall on one side of the fin body.

[0020] In some designs, the height of the extension wall protrusion is greater than the height of the smoke-blocking section;

[0021] Furthermore, the outer edge of the protruding end of the extension wall is provided with several support ends that extend toward the outer periphery of the insertion hole.

[0022] Combustion heat exchange components, including:

[0023] A burner used to generate a flame, the burner having a combustion port for the flame to be ejected outward;

[0024] A heat exchanger positioned above a burner includes a heat exchange housing and heat exchange pipes, the heat exchange housing having a heat exchange channel, and the heat exchange pipes having a portion disposed within the heat exchange channel.

[0025] The fin described in any of the above embodiments is placed in a heat exchange channel, and the heat exchange pipe has a portion inserted into the insertion hole of the fin and in contact with the fin;

[0026] The smoke guide shell has a smoke guide channel that is connected to the combustion port and discharges the flue gas generated by combustion upward into the heat exchange channel.

[0027] In some designs, a heat-resistant structure is formed in the sidewall of the smoke guide channel, and the heat-resistant structure includes:

[0028] A heat-insulating cavity is installed in the side wall of the smoke guide channel;

[0029] An air outlet is provided to connect the heat-insulating cavity and the smoke guiding channel;

[0030] An air inlet channel that connects the heat-insulating cavity to the outside air.

[0031] A gas water heater comprising the fins described in any of the above embodiments, or comprising the combustion heat exchange component described in any of the above embodiments.

[0032] The main beneficial effects of the above technical solution are as follows:

[0033] 1. By setting up a smoke-blocking section, not only can the contact area with the flue gas be increased, but the flow speed of the flue gas flowing from bottom to top can also be slowed down, extending the contact time between the flue gas and the fins, thereby improving the overall heat exchange effect of the fins and forming a high-efficiency heat exchange structure.

[0034] 2. By forming a first guide surface and a second guide surface, when a heat exchange pipe is inserted into the insertion hole, the fins can guide the flue gas to the shady side (the side that is not easy to come into contact with the flue gas) at the upper end of the heat exchange pipe, thereby further improving the heat exchange effect.

[0035] 3. A flow-blocking part is provided on one side of the fin body to further increase the contact area between the fin and the flue gas. Moreover, the flow-blocking part can block the flue gas that flows to the upper end of the insertion hole through the flow-guiding surface, slow down the flow rate of this part of the flue gas, and prolong the residence time of this part of the flue gas. When a heat exchange pipe is inserted in the insertion hole, the flue gas can have a longer time to contact and exchange heat with the shady side (the side that is not easy to contact the flue gas) at the upper end of the heat exchange pipe, thereby improving the heat exchange effect.

[0036] 4. An overflow notch is formed at the upper end of the fin body. While the baffle can improve the heat exchange effect, the overflow notch serves as a gap for the flue gas to flow upward, so that the flue gas can flow more smoothly in the direction from the smoke blocking part to the baffle and then out, reducing the possibility of flue gas flow blockage.

[0037] 5. The flow-blocking section and the smoke-blocking section are set at intervals to increase the channels for the flue gas to flow out. This improves the heat exchange effect to a certain extent while ensuring that the flue gas can flow more smoothly through the fins, further reducing the possibility of flue gas flow blockage.

[0038] Further or more detailed beneficial effects will be described in conjunction with specific embodiments in the detailed implementation. Attached Figure Description

[0039] The present invention will be further described below with reference to the accompanying drawings:

[0040] Figure 1 This is a schematic diagram of the internal structure of a gas water heater.

[0041] Figure 2 A schematic diagram of the combustion assembly installation structure.

[0042] Figure 3 This is a cross-sectional schematic diagram of the combustion assembly.

[0043] Figure 4 This is a schematic diagram of a heat exchanger.

[0044] Figure 5 This is a schematic diagram of the fin structure.

[0045] Figure 6 This is an enlarged schematic diagram of the air outlet and air inlet.

[0046] Figure 7 This is a schematic diagram of the airflow for heat dissipation.

[0047] Figure 8 This is a schematic diagram of an installation structure for a smoke guide shell. Detailed Implementation

[0048] The present invention will be illustrated with specific examples below:

[0049] Example:

[0050] Gas water heater, as attached Figure 1 As shown, it mainly includes a water heater casing, and a combustion heat exchange assembly and a fan assembly 4 placed inside the water heater casing. The combustion heat exchange assembly includes a combustion component for forming a high-temperature flame, and a heat exchanger 3 with water pipes for transferring high temperature to cold water in the water pipes. The fan assembly 4 is used to form a directional airflow in the combustion heat exchange assembly.

[0051] Specifically, for example, attached Figure 1 As shown, as an example, the combustion assembly includes a burner 1 and a flue gas housing 2. The flue gas housing 2 can be detachably (using a detachable connection method such as screws) or non-detachably (using a non-detachable connection method such as welding or integral molding) fixedly connected to the burner 1, or it can be not connected to the burner 1, but connected to other external support structures, such as the water heater casing.

[0052] The burner 1 includes a burner housing 1.1, the upper end of which has a combustion port 1.11 for the flame to be ejected outwards. More specifically, as shown in the attached... Figure 3 As an example, the burner housing 1.1 has an upward-facing opening at its upper end, which is a combustion port 1.11; and several burners 1.2 are installed in a hollow cavity inside the burner housing 1.1, and an air intake channel 1.12 for air to flow in is formed; an ignition device 1.3 for ignition is also provided in the combustion port 1.11 (the ignition device 1.3 is a conventional ignition device used in gas water heaters and gas stoves, such as an electric spark ignition device).

[0053] A gas passage for gas to flow into is formed inside the burner 1.2. The lower end of the gas passage is connected to the gas delivery pipeline, and the upper end is connected to the combustion port 1.11 so that the gas can be delivered to the combustion port 1.11 through the burner 1.2.

[0054] The lower end of the air intake passage 1.12 is open to allow air to flow in; the upper end is connected to the combustion port 1.11 so that external air can be delivered from the air intake passage 1.12 to the combustion port 1.11.

[0055] The smoke guide housing 2 is disposed above the burner 1, and the smoke guide housing 2 has a smoke guide channel 2.1 that communicates with the combustion port 1.11 and discharges the flue gas generated by combustion upward. The smoke guide channel 2.1 can be a vertically penetrating channel disposed in the smoke guide housing 2, and the lower end of the channel is connected to the combustion port 1.11.

[0056] Meanwhile, to better prevent the heat and smoke generated during combustion from escaping, the lower opening of the smoke guide channel 2.1 is connected to the combustion port 1.11 (i.e., the port of the combustion port 1.11 is close to or sufficiently adjacent to the port of the lower opening of the smoke guide channel 2.1), so that a combustion zone for flame combustion is formed in the smoke guide channel 2.1. The diameter of the smoke guide channel 2.1 is often greater than or equal to the opening diameter of the combustion port 1.11.

[0057] During operation, gas is supplied from the gas passage inside the burner 1.2 to the combustion port 1.11, and air flows from the air intake passage 1.12 to the combustion port 1.11. The ignition device 1.3 is then activated for ignition, igniting the gas at the combustion port 1.11 of the burner 1 to form an upward-flowing combustion flame. This flame enters the smoke guide passage 2.1 for combustion, creating a combustion zone within the passage. Simultaneously, the flue gas and heat generated by combustion enter the smoke guide passage 2.1 and flow upwards under its guiding effect.

[0058] The heat exchanger 3 is placed above the flue gas housing 2 and is used to exchange heat with the high-temperature flue gas in the flue gas channel 2.1 to form hot water.

[0059] To be precise, as shown in the appendix Figure 4 As illustrated as an example, the heat exchanger 3 includes a heat exchange housing 3.1, which can be detachably connected to the flue gas housing 2, for example, by screws, or to other external support structures, such as the water heater casing. The heat exchange housing 3.1 has heat exchange channels 3.11 (as shown in the attached diagram) that are through-type at both ends. Figure 3 As shown, the heat exchange channel 3.11 is a vertically through-hole; the lower end of the heat exchange channel 3.11 is connected to the upper opening of the flue gas guide channel 2.1 so that the high-temperature flue gas generated by combustion in the flue gas guide channel 2.1 can flow upward into the heat exchange channel 3.11.

[0060] Meanwhile, the heat exchanger 3 also includes a heat exchange pipe 3.2, which has a water inlet at one end and a water outlet at the other end. The heat exchange pipe 3.2 is connected to the heat exchange shell 3.1 and has a portion placed in the heat exchange channel 3.11. Implementation: When combustion occurs as described above to form a flame and high-temperature flue gas, the high-temperature flue gas flows into the heat exchange channel 3.11 to transfer heat to the portion of the heat exchange pipe 3.2 placed in the heat exchange channel 3.11. Simultaneously, cold water is supplied to the water inlet of the heat exchange pipe 3.2 through, for example, a tap water pipe. This cold water is heated after flowing through the portion of the heat exchange pipe 3.2 placed in the heat exchange channel 3.11, and then hot water is output from the outlet for use.

[0061] The heat exchange channel 3.11 may also be provided with several fins 3.3 (fins 3.3 are sheet-like structures made of materials with good thermal conductivity such as steel strip, stainless steel strip, copper strip, and aluminum strip). The fins 3.3 have a part that fits into the heat exchange pipe 3.2 to increase the heat exchange contact area with the high-temperature flue gas, so as to transfer the heat in the high-temperature flue gas to the heat exchange pipe 3.2 better and over a larger area, thereby further improving the heat exchange effect on the cold water in the heat exchange pipe 3.2.

[0062] The fan assembly 4 is a fan structure used in a gas water heater to form an airflow, and it is configured to form an airflow that drives flue gas from the flue gas channel 2.1 into the heat exchange channel 3.11.

[0063] The fan assembly 4 can be connected to the heat exchange housing 3.1, positioned at the upper opening of the heat exchange channel 3.11, and configured to draw in the flue gas from the smoke guide channel 2.1, driving the flue gas from the smoke guide channel 2.1 into the heat exchange channel 3.11. The fan assembly 4 is also equipped with a smoke exhaust duct for directional discharge of the drawn-in flue gas, which is connected to a smoke exhaust outlet in the building to directionally discharge the flue gas.

[0064] The fan assembly 4 can also be connected to the burner 1, positioned at the lower opening of the air intake passage 1.12, and configured to blow the flue gas in the smoke guide passage 2.1 upwards, thereby driving the flue gas from the smoke guide passage 2.1 into the heat exchange passage 3.11. In this case, the upper opening of the heat exchange passage 3.11 is used to connect with the exhaust port in the building.

[0065] In summary, the combustion assembly, heat exchanger 3, and fan assembly 4 together constitute the main components of a gas water heater.

[0066] To improve heat exchange efficiency, the structure of fin 3.3 needs to be modified. Therefore, this application provides fins that can improve heat exchange efficiency; and a combustion heat exchange assembly and a gas water heater having the fins.

[0067] For details, see attached. Figure 5 As shown, in this embodiment, the fin 3.3 includes a fin body 3.31, which is provided with insertion holes 3.32 for inserting heat exchange pipes 3.2. There are at least two insertion holes 3.32, which are spaced apart laterally. When the fin 3.3 is installed in the heat exchange channel 3.11, the heat exchange pipe 3.2 extends in a curved manner and passes through several insertion holes 3.32 in sequence. The inserted part of the heat exchange pipe 3.2 is in contact with the fin 3.3 (inner wall of the insertion hole 3.32) so that the heat obtained by the fin 3.3 through heat transfer with the high-temperature flue gas can be transferred to the heat exchange pipe 3.2 to heat the heat exchange pipe 3.2.

[0068] Furthermore, as shown in the appendix Figure 5 As shown, one side of the fin body 3.31 has a protruding smoke-blocking portion 3.33, which is located in the middle region of the two insertion holes 3.32. The lower end face of the smoke-blocking portion 3.33 extends in an arc shape and has a first guide surface 3.331 that guides the flue gas flowing from bottom to top to the upper end of one insertion hole 3.32; and a second guide surface 3.332 that guides the flue gas flowing from bottom to top to the upper end of the other insertion hole 3.32. In this way, not only can the contact area between the fin 3.3 and the flue gas be increased, but the flow velocity of the flue gas flowing from bottom to top can also be slowed down, the contact time between the flue gas and the fin 3.3 be extended, and thus the overall heat exchange effect of the fin 3.3 be improved. Furthermore, by forming a first guide surface 3.331 and a second guide surface 3.332, when a heat exchange pipe 3.2 is inserted into the insertion hole 3.32, the fins 3.3 can guide the flue gas to the shady side (the side that is not easy to contact with the flue gas) at the upper end of the heat exchange pipe 3.2, thereby further improving the heat exchange effect.

[0069] As attached Figure 5 As shown, a protruding baffle portion 3.35 is also provided on one side of the fin body 3.31, and the baffle portion 3.35 is positioned above the insertion hole 3.32. This further increases the contact area between the fin 3.3 and the flue gas. Moreover, the baffle portion 3.35 can block the flue gas flowing to the upper end of the insertion hole 3.32 through the aforementioned guide surface, slowing down the flow rate of this part of the flue gas and prolonging the residence time of this part of the flue gas. When the heat exchange pipe 3.2 is inserted into the insertion hole 3.32, the flue gas can have a longer time to contact and exchange heat with the shaded side (the side that is not easy to contact with the flue gas) at the upper end of the heat exchange pipe 3.2, thereby improving the heat exchange effect.

[0070] At this point, excessive smoke may accumulate at the baffle section 3.35, leading to poor smoke flow. Therefore, as shown in the attached... Figure 5As shown in the illustration, in this embodiment, a portion of the structure can be removed or cut away from the upper end of the fin body 3.31 to form an overflow notch 3.34 above the insertion hole 3.32 with its opening facing upwards. This overflow notch 3.34 allows flue gas from one side of the fin body 3.31 to flow outwards, and a baffle 3.35 is positioned on both sides of the opening of the overflow notch 3.34. In this way, while the baffle 3.35 improves the heat exchange effect as described above, the overflow notch 3.34 serves as an opening for the upward flow of flue gas, allowing the flue gas to flow more smoothly in the direction from the smoke-blocking part 3.33 to the baffle 3.35, reducing the possibility of flue gas flow blockage.

[0071] As attached Figure 5 As shown, the baffle 3.35 and the smoke blocking 3.33 can also be spaced apart, so that the baffle 3.35 and the smoke blocking 3.33 are spaced apart and have an exhaust port 3.36 for the flue gas outlet. Increasing the flue gas outlet not only improves the heat exchange effect to a certain extent, but also ensures that the flue gas can flow more smoothly through the fins 3.3, further reducing the possibility of flue gas flow blockage.

[0072] Furthermore, both ends of the fin body 3.31 have a flow-limiting portion 3.37 that protrudes from one side of the fin body 3.31 and extends vertically; the insertion hole 3.32 is disposed between the two flow-limiting portions 3.37. By providing the flow-limiting portion 3.37, a blocking structure is formed at both ends of the fin body 3.31 to prevent the flue gas from diffusing to both sides, so that the flue gas can flow better and more concentratedly into the area where the insertion hole 3.32 is set, so that when the heat exchange pipe 3.2 is inserted into the insertion hole 3.32, the flue gas can heat the heat exchange pipe 3.2 better and more concentratedly.

[0073] The smoke-blocking part 3.33, the flow-blocking part 3.35, and the flow-limiting part 3.37 mentioned above are all preferably flanged structures formed by flanging the fin body 3.31. This is to better ensure structural strength and consistency.

[0074] The wall of the insertion hole 3.32 may also extend to include a raised extension wall 3.321 on one side of the fin body 3.31. When the heat exchange pipe 3.2 is inserted into the insertion hole 3.32, the heat exchange pipe 3.2 and the extension wall 3.321 are also fitted together to increase the contact area with the heat exchange pipe 3.2 and improve the heat exchange effect of the heat exchange pipe 3.2.

[0075] At this point, the extension wall 3.321 and the smoke-blocking portion 3.33 are preferably disposed on the same side of the fin body 3.31, and the protrusion height of the extension wall 3.321 is greater than the protrusion height of the smoke-blocking portion 3.33; and the outer edge of the protruding end of the extension wall 3.321 is provided with a plurality of support ends 3.322 extending toward the outer periphery of the insertion hole 3.32. In this way, when multiple fins 3.3 are stacked, the support ends 3.322, as a support structure, will protect the smoke-blocking portion 3.33, ensuring that the smoke-blocking portion 3.33 can stably and smoothly change the airflow as required, as described above.

[0076] For the gas water heater mentioned above, it also includes several electrical components installed outside the combustion assembly. When the combustion assembly is working as described above, the high temperature heat inside the smoke guide shell 2 is easy to escape. This not only drives the surface temperature of the smoke guide shell 2 to be too high, affecting the service life of the smoke guide shell 2, but also has an adverse effect on the electrical components outside the combustion assembly. In severe cases, it will greatly reduce the service life of the gas water heater.

[0077] Therefore, it is also necessary to develop a combustion heat exchange component that can prevent heat leakage from the smoke guide shell 2 and better reduce the surface temperature of the smoke guide shell 2. A gas water heater equipped with this combustion heat exchange component is proposed.

[0078] As one approach, a water-cooling structure can be provided on the outer surface of the smoke guide shell 2 to solve the above problems. However, setting up a water-cooling structure often requires a complex piping structure, resulting in complex piping structures and installation difficulties for the combustion assembly; moreover, in order to better prevent water leakage and water corrosion, the water-cooled piping structure often requires a large cost.

[0079] To address the aforementioned issues while simplifying the structure and reducing costs, this application proposes a combustion heat exchange component that can prevent heat loss without water and better avoid water cooling problems. A gas water heater incorporating this combustion heat exchange component is also proposed.

[0080] As an example, see attached Figure 3 and attached Figure 6 As shown, the combustion heat exchange assembly in this embodiment also includes a heat-resistant structure formed in the sidewall of the smoke guide channel 2.1.

[0081] Specifically, the heat-insulating structure includes: a heat-insulating cavity 2.2, an air outlet channel 2.4, and an air inlet channel 2.3. More precisely, for example, [the structure includes...]. Figure 3 and attached Figure 6As shown, the heat-insulating cavity 2.2 is a cavity located in the side wall of the smoke guiding channel 2.1; the air outlet 2.4 is a hole located in the side wall of the heat-insulating cavity 2.2 that is laterally close to the smoke guiding channel 2.1 and connects the heat-insulating cavity 2.2 with the smoke guiding channel 2.1; the air inlet 2.3 is a hole located in the side wall of the heat-insulating cavity 2.2 that is laterally away from the smoke guiding channel 2.1 and connects the heat-insulating cavity 2.2 with the outside air, and the air inlet 2.3 is connected to the heat-insulating cavity 2.2.

[0082] At this time, when a flame forms in the combustion zone of the smoke guide duct 2.1, it consumes oxygen and fuel gas, and forms directly rising high-temperature flue gas, creating a low-pressure zone in the smoke guide duct 2.1. Meanwhile, external air enters the heat-insulating cavity 2.2 through the air inlet duct 2.3, flows through the heat-insulating cavity 2.2, and then flows out through the air outlet duct 2.4 back into the smoke guide duct 2.1, thus creating a flowing airflow in the heat-insulating cavity 2.2 (as shown in the attached diagram). Figure 7 (As indicated by the middle arrow) This is called the heat-insulating airflow. This heat-insulating airflow forms a wind-cooled heat insulation, which can bring the heat dissipated from the surface of the smoke guide shell 2 outward through the smoke guide channel 2.1 back into the smoke guide channel 2.1. It not only prevents the heat generated by the flame combustion in the smoke guide shell 2 from escaping outward, effectively controlling the surface temperature of the combustion component, but also brings the dissipated heat back into the smoke guide channel 2.1 for heat exchange with the heat exchanger 3, improving the overall effective heat output rate of the combustion component. At the same time, the above-mentioned heat-insulating structure does not require additional complex water pipe structures, has a simpler and easier-to-install structure, and does not require significant costs to deal with the control of the water cooling circuit and the problem of water corrosion, thus better avoiding the problems associated with water cooling.

[0083] The specific locations of the air outlet 2.4 and the air inlet 2.3 can be set according to requirements. In this embodiment, as shown in the attached figure... Figure 3 and attached Figure 6 As shown, the air inlet duct 2.3 is connected to the upper region of the heat-insulating cavity 2.2 (vertically, the heat-insulating cavity 2.2 is divided into three equal parts, from top to bottom: an upper region, a middle region, and a lower region). Simultaneously, the air outlet duct 2.4 is preferably connected to the lower region of the heat-insulating cavity 2.2, allowing airflow to flow from the upper region into the heat-insulating cavity 2.2 and out through the lower region. This creates a larger airflow area within the heat-insulating cavity 2.2, resulting in a larger heat-blocking area and improved heat rejection.

[0084] Furthermore, as shown in the appendix Figure 3 and attached Figure 6As shown, the end of the air outlet 2.4 furthest from the heat-insulating cavity 2.2 can be aligned with the combustion zone so that the airflow output from the air outlet 2.4 can be delivered to the combustion zone of the smoke guide channel 2.1. In this way, the air with a certain amount of heat in the heat-insulating cavity 2.2 can participate more effectively in the combustion of the combustion assembly, thereby improving the overall combustion efficiency and combustion effect of the combustion assembly.

[0085] In the above plan, as shown in the appendix Figure 3 As shown, the air intake duct 2.3 can be located on the side wall of the heat-insulating cavity 2.2 facing away from the smoke guide channel 2.1 (i.e., the side wall of the heat-insulating cavity 2.2 is laterally away from the smoke guide channel 2.1), so as to have a more spacious area for external air to flow into the air intake duct 2.3, thereby improving the smoothness of airflow and enhancing the heat blocking effect. At this time, as shown in the attached... Figure 6 As shown, the side wall of the heat-insulating cavity 2.2 facing away from the smoke guide channel 2.1 may also be provided with a protruding flow guide 2.5 into the heat-insulating cavity 2.2. The flow guide 2.5 is inclined so as to guide the airflow entering the heat-insulating cavity 2.2 from the air inlet channel 2.3 to flow upward and then downward, so as to further increase the flow area of ​​the airflow in the heat-insulating cavity 2.2 and increase the heat blocking area.

[0086] In some designs, for the side wall of the heat-insulating cavity 2.2 located between the smoke guide channel 2.1 and the heat-insulating cavity 2.2, a plurality of heat-drawing parts 2.24 protruding into the heat-insulating cavity 2.2 can be provided. This can increase the contact area between the airflow and the side wall of the smoke guide channel 2.1, thereby improving the heat exchange efficiency between the airflow and the side wall of the smoke guide channel 2.1, so that the airflow flowing through the heat-insulating cavity 2.2 can carry an equal amount of heat back to the smoke guide channel 2.1.

[0087] To improve the overall heat blocking effect, multiple heat-blocking structures as described above can be arranged around the smoke guide channel 2.1, and the heat-blocking cavities 2.2 in each heat-blocking structure are interconnected to form an annular cavity around the outer periphery of the smoke guide channel 2.1, which blocks the heat in the smoke guide shell 2 from overflowing outward in a 360-degree manner.

[0088] At this time, as attached Figure 8As shown, the smoke guide housing 2 mainly consists of an inner housing 2a with an internal smoke guide channel 2.1, and an outer housing surrounding the inner housing 2a. A heat-insulating cavity 2.2 is formed between the inner housing 2a and the outer housing at intervals. The outer housing includes a first outer plate 2b.1 and a second outer plate 2b.2, which are detachably connected by, for example, screws to form the outer housing. Preferably, both the first outer plate 2b.1 and the second outer plate 2b.2 are detachably fixed to the inner housing 2a by, for example, screws. An exhaust duct 2.4 is provided in the inner housing 2a, and an intake duct 2.3 is provided in the outer housing.

[0089] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model. Furthermore, the terms "vertical," "horizontal," "front," and "rear," etc., mentioned in the embodiments of the present utility model, indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product is in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present utility model. It should be further noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," and "fixing" in the description should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the present utility model according to the specific circumstances.

[0090] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A fin, characterized in that, include: The fin body (3.31) is provided with insertion holes (3.32) for inserting heat exchange pipes (3.2), said insertion holes (3.32) being at least two and spaced apart in the transverse direction; One side of the fin body (3.31) has a protruding smoke-blocking portion (3.33), which is located in the middle region of the two insertion holes (3.32), and the lower end face of the smoke-blocking portion (3.33) extends in an arc shape to form: The flue gas flowing from bottom to top is partially guided to a first guide surface (3.331) at the upper end of one of the insertion holes (3.32); And, a portion of the flue gas flowing from bottom to top is guided to a second guide surface (3.332) at the upper end of another insertion port (3.32).

2. The fin according to claim 1, characterized in that: One side of the fin body (3.31) also has a protruding baffle (3.35), which is positioned above the insertion hole (3.32).

3. The fin according to claim 2, characterized in that: The fin body (3.31) has an overflow notch (3.34) located above the insertion hole (3.32) and with its opening facing upwards; The flow-blocking part (3.35) is placed on both sides of the opening of the overflow notch (3.34).

4. The fin according to claim 2, characterized in that: The flow-blocking part (3.35) and the smoke-blocking part (3.33) are spaced apart by an exhaust port (3.36) from which the flue gas flows out.

5. The fin according to claim 1, characterized in that: Both ends of the fin body (3.31) have a flow-limiting portion (3.37) that protrudes from one side of the fin body (3.31) and extends vertically. The insertion port (3.32) is located between the two flow-limiting parts (3.37).

6. The fin according to any one of claims 1 to 5, characterized in that: The wall of the insertion hole (3.32) extends with an extension wall (3.321) that protrudes from one side of the fin body (3.31).

7. The fin according to claim 6, characterized in that: The protrusion height of the extended wall (3.321) is greater than the protrusion height of the smoke-blocking part (3.33); Furthermore, the outer edge of the protruding end of the extension wall (3.321) is provided with a plurality of support ends (3.322) extending in the direction of the outer periphery of the insertion hole (3.32).

8. A combustion heat exchange assembly, characterized in that, include: A burner (1) for forming a flame, the burner (1) having a combustion port (1.11) for the flame to be ejected outward; A heat exchanger (3) positioned above the burner (1) includes a heat exchange housing (3.1) and a heat exchange pipe (3.2), wherein the heat exchange housing (3.1) has a heat exchange channel (3.11) and the heat exchange pipe (3.2) has a portion disposed within the heat exchange channel (3.11); The fin (3.3) according to any one of claims 1 to 7, wherein the fin (3.3) is placed in the heat exchange channel (3.11), and the heat exchange pipe (3.2) has a portion inserted into the insertion hole (3.32) of the fin (3.3) and in contact with the fin (3.3); The smoke guide shell (2) has a smoke guide channel (2.1) that is connected to the combustion port (1.11) and discharges the flue gas generated by combustion upward to the heat exchange channel (3.11).

9. The combustion heat exchange assembly according to claim 8, characterized in that: A heat-resistant structure is formed in the sidewall of the smoke guiding channel (2.1), the heat-resistant structure comprising: A heat-insulating cavity (2.2) is disposed in the side wall of the smoke guiding channel (2.1); An air outlet (2.4) is provided to connect the heat-insulating cavity (2.2) with the smoke guiding channel (2.1); An air inlet (2.3) is provided to connect the heat-insulating cavity (2.2) to the outside air.

10. A gas-fired water heater, characterized in that: It comprises the fins as described in any one of claims 1 to 7, or the combustion heat exchange assembly as described in any one of claims 8 to 9.

Images