Combustion heat exchange assembly and gas water heater with same

Abstract

The invention relates to the technical field of household appliance equipment, in particular to a combustion heat exchange assembly and a gas water heater with the assembly, the combustion heat exchange assembly comprises a combustor used for forming flames, and the combustion assembly is provided with a combustion port allowing the flames to be sprayed outwards; the heat exchanger is arranged on the combustor and comprises a heat exchange shell, a heat exchange pipeline and heat exchange fins, a heat exchange channel is arranged in the heat exchange shell, the heat exchange pipeline is provided with a heat exchange part arranged in the heat exchange channel, and the heat exchange fins are arranged in the heat exchange channel and attached to the heat exchange part; the smoke guide shell is internally provided with a smoke guide channel which is communicated with the combustion opening and upwards discharges smoke generated by combustion into the heat exchange channel, and a lower end opening of the smoke guide channel is connected with the combustion opening so that a combustion area for flame combustion can be formed in the smoke guide channel. A heat resisting structure is formed in the side wall of the smoke guiding channel. According to the combustion heat exchange assembly, heat can be prevented from being dissipated outwards through a simple structure, and the combustion heat exchange assembly is higher in economical efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of household electrical appliances, and more particularly to a combustion heat exchange component and a gas water heater having the same. Background Art

[0002] Gas water heating equipment is a civil heating device that utilizes the heat energy released by gas combustion and transfers the heat to the flowing water body through a heat exchange device to achieve instant heating. Its basic structure mainly consists of several functional units: a combustion heat exchange component (including a combustion component that generates a high-temperature flame and a heat exchanger that realizes gas-water heat conduction through finned heat exchange tubes), a fan system (including aerodynamic devices such as a turbine fan), and supporting fluid pipelines and an electronic control unit.

[0003] In the current technical system, in order to solve the thermal influence of the high-temperature working conditions of the combustion component on adjacent electronic devices, two types of heat dissipation technical solutions are mainly adopted: the first is to integrate a circulating water cooling heat dissipation structure outside the combustion chamber housing, and the second is to install a forced air cooling device outside the equipment. However, actual engineering applications show that:

[0004] For the circulating water cooling solution, its cooling pipes need to be arranged in a multi-dimensional space with the combustion chamber, resulting in a complex system structure design and a cumbersome installation and commissioning process; in order to ensure the sealing of the cooling medium and resist the oxidation and corrosion of the pipeline, high-grade anti-corrosion materials must be selected and special surface treatment processes must be implemented, directly increasing the product material cost; during the long-term operation of the equipment, scale formation may occur in the cooling channels, resulting in a decrease in heat conduction efficiency and an increase in maintenance costs.

[0005] Regarding the forced air cooling system, since a dedicated fan component needs to be added, it not only generates additional equipment procurement costs, but also requires planning an independent air guiding channel and a supporting electronic control circuit, resulting in a significant increase in the complexity of the internal layout of the whole machine.

[0006] Therefore, the above two types of conventional heat dissipation technologies have significant technical defects in terms of system structure complexity, manufacturing cost control, and economic indicators. Summary of the Invention

[0007] One of the purposes of the present invention is to provide, in view of the deficiencies of the prior art: a combustion heat exchange component that combines the gas combustion characteristics, can block the heat from dissipating outward through a simple structure, and has higher economy.

[0008] Another purpose of the invention is to provide a gas water heater having the above combustion heat exchange component.

[0009] The technical solution of the present invention is as follows:

[0010] A combustion heat exchange component, comprising:

[0011] A burner for forming a flame, the burner having a combustion port through which the flame ejects outward;

[0012] A heat exchanger disposed above the burner, which includes a heat exchange housing, heat exchange pipes, and heat exchange fins. The heat exchange housing has a heat exchange passage, the heat exchange pipes have heat exchange portions disposed in the heat exchange passage, and the heat exchange fins are disposed in the heat exchange passage and are in contact with the heat exchange portions;

[0013] A smoke guiding housing, which has therein: a smoke guiding passage connected to the combustion port and discharging the smoke generated by combustion upward into the heat exchange passage, and a lower end opening of the smoke guiding passage is connected to the combustion port so that a combustion area for the flame to burn is formed in the smoke guiding passage;

[0014] A heat insulation structure is formed in the side wall of the smoke guiding passage, and the heat insulation structure includes:

[0015] A near heat flow cavity and a far heat flow cavity disposed in the side wall of the smoke guiding passage, the near heat flow cavity being disposed between the far heat flow cavity and the smoke guiding passage;

[0016] An over - flow pore channel for connecting the near heat flow cavity and the far heat flow cavity;

[0017] An air outlet pore channel for connecting the near heat flow cavity and the smoke guiding passage;

[0018] A first air inlet channel for connecting the far heat flow cavity and the external space of the smoke guiding housing.

[0019] In some solutions, at least two first air inlet channels are provided, and the two first air inlet channels are spaced apart vertically. Among them:

[0020] One first air inlet channel is connected to the upper end region of the far heat flow cavity;

[0021] The other first air inlet channel is connected to the lower end region of the far heat flow cavity.

[0022] In some solutions, at least two air outlet pore channels are provided, and the two air outlet pore channels are spaced apart vertically. Among them:

[0023] One air outlet pore channel is connected to the upper end region of the near heat flow cavity;

[0024] The other air outlet pore channel is connected to the lower end region of the near heat flow cavity.

[0025] In some solutions, the air outlet pore channel is connected to the upper end region of the near heat flow cavity;

[0026] Moreover, a second air inlet channel for connecting the lower end region of the near heat flow cavity and the external space of the smoke guiding housing is provided in the bottom wall of the near heat flow cavity.

[0027] In some solutions, the heat exchange fin includes a fin body which has at least two insertion tube holes, and the two insertion tube holes are arranged at intervals in the transverse direction;

[0028] The heat exchange pipe extends in a curved manner and sequentially passes through the two insertion tube holes;

[0029] One side surface of the fin body has a raised smoke blocking structure, and this smoke blocking structure is placed in the middle area between the two insertion tube holes and drives the smoke flowing from bottom to top to flow towards the insertion tube holes on both sides of it.

[0030] In some solutions, the smoke blocking structure includes: a first smoke blocking part, a second smoke blocking part, and a third smoke blocking part which are arranged at intervals from bottom to top;

[0031] In the direction from bottom to top, the width dimensions of the first smoke blocking part, the second smoke blocking part, and the third smoke blocking part gradually increase.

[0032] In some solutions, the second smoke blocking part includes:

[0033] A first guide plate extending in an inclined manner, which is configured to: guide the smoke flowing from bottom to top to the upper end of one insertion tube hole;

[0034] A second guide plate extending in an inclined manner, which is configured to: guide the smoke flowing from bottom to top to the upper end of the other insertion tube hole;

[0035] And the lower end of the first guide plate is close to or in contact with the lower end of the second guide plate.

[0036] In some solutions, a flow guiding part protruding into the smoke guiding channel is provided on the side wall of the smoke guiding channel;

[0037] The inside of the flow guiding part is provided as a cavity and is communicated with the near heat flow cavity;

[0038] And, the outer wall of the flow guiding part includes:

[0039] A drainage wall facing the combustion port, which is inclined to be able to guide the airflow flowing upward from the side wall of the smoke guiding channel to the center of the smoke guiding channel;

[0040] A backflow wall facing away from the combustion port;

[0041] And a connecting wall extending vertically and connecting the drainage wall and the backflow wall;

[0042] The air outlet channel is arranged on the backflow wall.

[0043] In some solutions, a flow guiding part protruding into the smoke guiding channel is provided on the side wall of the smoke guiding channel;

[0044] The inside of the flow guiding part is provided as a cavity and is communicated with the near heat flow cavity;

[0045] Moreover, the outer wall of the diversion part includes:

[0046] A drainage wall facing the combustion port, which is inclined to guide the airflow at the side wall of the smoke guide channel to the center of the smoke guide channel;

[0047] A backflow wall facing away from the combustion port;

[0048] And a connecting wall extending vertically and connecting the drainage wall and the backflow wall;

[0049] The air outlet channel is arranged on the connecting wall.

[0050] In some solutions, the side wall of the smoke guide channel is bent to form a stepped flow part that extends horizontally and is located below the diversion part;

[0051] The stepped flow part is provided with a supplementary air channel for air in the external space of the smoke guide housing to enter the smoke guide channel.

[0052] A gas water heater includes the combustion heat exchange component described in any of the above solutions.

[0053] The main beneficial effects of the above technical solutions are as follows:

[0054] 1. By providing a heat resistance structure in the side wall of the smoke guide channel in the smoke guide housing, which can use cold air as a heat insulation medium, the heat formed by the flame combustion in the smoke guide housing can be blocked from overflowing outward, effectively controlling the surface temperature of the combustion component.

[0055] 2. The overall heat resistance structure is simpler, which can better reduce the production cost.

[0056] 3. The heat resistance structure of the double-layer cavity can further improve the blocking effect on heat overflow and effectively control the surface temperature of the combustion component.

[0057] 4. In addition to forming air-cooled heat insulation, the heat resistance airflow can also bring the dissipated heat back into the smoke guide channel for heat exchange with the heat exchanger, improving the overall effective heat output rate of the combustion component to form a high-efficiency gas combustion structure.

[0058] 5. By forming a heat resistance structure, when the combustion component is working, more and more stable oxygen in the external space can be input into the smoke guide channel, so as to better form a uniform oxygen and stable combustion chamber in the smoke guide housing.

[0059] 6. By setting the fins accordingly to form a smoke resistance structure, the heat exchange efficiency can be better improved.

[0060] 7. Connect an air outlet channel to the upper region of the near heat flow cavity; connect the other air outlet channel to the lower region of the near heat flow cavity, which can form a heat-blocking air flow with a larger area in the near heat flow cavity and improve the heat-blocking effect.

[0061] 8. On the basis of the above-mentioned air outlet channels, connect one end opening of the flow-through hole channel to the middle region of the near heat flow cavity and the other end opening to the middle region of the far heat flow cavity. While forming a large-area air flow for heat blocking, for both air flows, they have relatively short flow paths, enabling each air flow to better and faster bring the heat dissipated to the near heat flow cavity back to the smoke guide channel, and it is not easy to have uneven heat blocking, so as to further improve the overall heat blocking effect.

[0062] 9. Connect the air outlet channel to the upper region of the near heat flow cavity, and a second air inlet channel is also provided in the bottom wall of the near heat flow cavity, so as to form a heat-blocking air flow with a larger area in the near heat flow cavity and improve the heat-blocking effect.

[0063] 10. By setting the air supplement channel, on the one hand, it can further increase the intake of air so that the gas can burn better and more fully. On the other hand, combined with the above-mentioned diversion part setting, with the rest being the same, adding the air supplement channel can increase the overall intake of air, and then can better improve the gas flow rate in the smoke guide channel at the connection wall, and further provide assistance for the formation and smooth flow of the heat-blocking air flow, so as to better block the heat in the smoke guide channel from overflowing outward.

[0064] Further or more detailed beneficial effects will be described in combination with specific embodiments in the specific implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] The following further describes the present invention with reference to the drawings:

[0066] Figure 1 It is a schematic diagram of the internal structure of a gas water heater.

[0067] Figure 2 It is a schematic diagram of the installation structure of the combustion assembly.

[0068] Figure 3 It is a sectional view of the combustion assembly.

[0069] Figure 4 It is a schematic diagram of the structure of the heat exchanger.

[0070] Figure 5 It is a schematic diagram of the fin structure.

[0071] Figure 6 It is a front view of the fin.

[0072] Figure 7It is a schematic cross-sectional view of the smoke guide housing.

[0073] Figure 8 It is a schematic assembly structure view of the smoke guide housing.

[0074] Figure 9 It is a schematic cross-sectional view of the smoke guide housing when two air outlet channels are provided.

[0075] Figure 10 It is a schematic structure view of the air outlet channel arranged on the flow guiding part.

[0076] Figure 11 It is a schematic structure view of the smoke guide housing when a second air inlet channel is provided.

[0077] Figure 12 It is a schematic view of the setting of the supplementary air hole channel. Detailed implementation manners

[0078] The present invention will be specifically illustrated below in conjunction with embodiments:

[0079] Embodiment:

[0080] The gas water heater, as shown in the appendix Figure 1 shown, mainly includes a water heater housing, and a combustion heat exchange component and a fan component 4 placed inside the water heater housing. The combustion heat exchange component includes: a combustion component for forming a high-temperature flame, and a heat exchanger 3 having a water pipe and for transferring the high temperature to the cold water in the water pipe. The fan component 4 is used to form a directional air flow in the combustion heat exchange component.

[0081] Specifically, as shown in the appendix Figure 1 shown, as an example, the combustion component includes a burner 1 and a smoke guide housing 2. The smoke guide housing 2 can be detachably (adopting a detachable connection method such as screws, etc.) or non-detachably (adopting a non-detachable connection method such as welding, integral molding connection, etc.) fixedly connected to the burner 1, or can be not connected to the burner 1, but connected to other external support structures, such as the water heater housing.

[0082] Among them, the burner 1 includes a burner housing 1.1, and the upper end of the burner housing 1.1 has a combustion port 1.11 for the flame to spray outwards. Exactly, as shown in the appendix Figure 3 shown as an example, an opening facing upwards is formed at the upper end of the burner housing 1.1, and this opening is the combustion port 1.11; moreover, a number of fire grates 1.2 are installed in a cavity in 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 (this ignition device 1.3 is a conventional ignition device in gas water heaters and gas stoves, such as an electric spark ignition device, etc.) is also arranged in the combustion port 1.11.

[0083] A gas passage for the inflow of gas is formed inside the burner panel 1.2. The lower end of the gas passage is used to connect to the gas transmission pipeline, and the upper end is communicated with the combustion port 1.11, so that the gas can be transported to the combustion port 1.11 through the burner panel 1.2.

[0084] The lower end of the air intake passage 1.12 is open for air to flow in; the upper end is communicated with the combustion port 1.11, so that the external air can be transported from the air intake passage 1.12 to the combustion port 1.11.

[0085] The smoke guiding housing 2 is arranged above the burner 1, and inside the smoke guiding housing 2 there is: a smoke guiding passage 2.1 that is communicated with the combustion port 1.11 and discharges the smoke generated by combustion upward. The smoke guiding passage 2.1 can be a through hole arranged vertically in the smoke guiding housing 2, and the lower end opening of the hole is communicated with the combustion port 1.11.

[0086] At the same time, in order to better prevent the heat and smoke generated by combustion from overflowing, the lower end opening of the smoke guiding passage 2.1 is arranged in contact with the combustion port 1.11 (that is, the port of the combustion port 1.11 is in contact with or close enough to the port of the lower end opening of the smoke guiding passage 2.1), so that a combustion area for the flame to burn is formed in the smoke guiding passage 2.1. The channel diameter of the smoke guiding passage 2.1 is often greater than or equal to the opening diameter of the combustion port 1.11.

[0087] During operation, the gas is transported from the gas passage inside the burner panel 1.2 to the combustion port 1.11, the air flows from the air intake passage 1.12 to the combustion port 1.11, and the ignition device 1.3 is controlled to be turned on for ignition, so that the gas at the combustion port 1.11 of the burner 1 can be ignited to form an upward gushing combustion flame. The combustion flame surges into the smoke guiding passage 2.1 for combustion, so that a combustion area for the flame to burn is formed in the smoke guiding passage 2.1. At this time, the smoke and heat generated by combustion enter the smoke guiding passage 2.1 and flow upward under the guiding action of the smoke guiding passage 2.1.

[0088] The heat exchanger 3 is placed above the smoke guiding housing 2 and is used to exchange heat with the high-temperature smoke in the smoke guiding passage 2.1 to form hot water.

[0089] Specifically, as an example shown in the appendix Figure 4 The heat exchanger 3 includes a heat exchange housing 3.1, and the heat exchange housing 3.1 can be detachably connected to the smoke guiding housing 2 by, for example, screws, or connected to other external support structures, such as the water heater housing. The heat exchange housing 3.1 has a heat exchange passage 3.11 that is through at both ends (as shown in the appendix Figure 3As shown in the figure, the heat exchange channel 3.11 is a through hole arranged in the vertical direction); the lower end of the heat exchange channel 3.11 is connected with and communicated with the upper end opening of the smoke guide channel 2.1, so that the high-temperature flue gas generated by the combustion in the smoke guide channel 2.1 can flow upward into the heat exchange channel 3.11.

[0090] Meanwhile, the heat exchanger 3 also includes a heat exchange pipe 3.2, one end of which has a water inlet for water inlet and the other end of which has a water outlet for water outlet; the heat exchange pipe 3.2 is connected to the heat exchange housing 3.1 and has a heat exchange portion placed in the heat exchange channel 3.11. Implementation: When combustion is performed to form flames and high-temperature flue gas as described above, the high-temperature flue gas flows into the heat exchange channel 3.11 to transfer heat to the heat exchange portion of the heat exchange pipe 3.2 placed in the heat exchange channel 3.11, and at the same time, cold water is transported to the water inlet of the heat exchange pipe 3.2 through, for example, a tap water pipe, and the 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 water outlet for use.

[0091] A plurality of heat exchange fins 3.3 (the heat exchange fins 3.3 are sheet structures made of materials with good thermal conductivity such as steel strips, stainless steel strips, copper strips, and aluminum strips) may also be provided in the heat exchange channel 3.11. The heat exchange fins 3.3 have a portion that fits with the heat exchange pipe 3.2, so as to increase the heat exchange contact area with the high-temperature flue gas, and transfer the heat in the high-temperature flue gas to the heat exchange pipe 3.2 in a better and larger area, so as to further improve the heat exchange effect on the cold water in the heat exchange pipe 3.2.

[0092] In order to improve the heat exchange effect, especially when the high-temperature airflow is concentrated in the center of the heat exchange channel 3.11 to flow upward by setting the guide part 2.6 as described below, it is suitable to perform heat exchange with a higher speed airflow to improve the heat exchange effect and efficiency; as shown in the attached Figure 5 As shown, the heat exchange fin 3.3 in this embodiment includes a fin body 3.31, which is provided with a pipe insertion hole 3.32 for inserting the heat exchange pipe 3.2, and there are at least two pipe insertion holes 3.32 arranged at intervals in the transverse direction. When the heat exchange 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 a plurality of pipe insertion holes 3.32 in sequence, and the inserted portion of the heat exchange pipe 3.2 fits the heat exchange fin 3.3, so that the heat obtained by the heat exchange fin 3.3 and the high-temperature flue gas can be transferred to the heat exchange pipe 3.2 to heat the heat exchange pipe 3.2.

[0093] As attached Figure 5As shown in the figure, one side of the fin body 3.31 has a raised smoke-blocking structure, which is placed in the middle area between the two insertion holes 3.32 and drives the smoke flowing from bottom to top to flow towards the insertion holes 3.32 on both sides of it. Realize: By setting the smoke-blocking structure, not only the contact area of the heat exchange fin 3.3 for contacting with the hot air flow is increased, the air flow velocity is slowed down to extend the contact time between the air flow and the heat exchange fin 3.3, thereby improving the heat exchange effect; but also the air flow can be driven to flow towards the insertion holes 3.32 where the heat exchange pipes 3.2 are inserted, so that the hot air flow can better and faster heat the heat exchange pipes 3.2.

[0094] Furthermore, in this embodiment, the smoke-blocking structure includes: a first smoke-blocking part 3.34, a second smoke-blocking part 3.35 and a third smoke-blocking part 3.36 arranged at intervals from bottom to top. And, in the direction from bottom to top, the width dimensions of the first smoke-blocking part 3.34, the second smoke-blocking part 3.35 and the third smoke-blocking part 3.36 (such as the interval dimensions at both ends of the smoke-blocking part in the left-right direction) gradually increase. That is, as shown in the figure, the width dimension d1 of the first smoke-blocking part 3.34 is less than the width dimension d2 of the second smoke-blocking part 3.35, and the width dimension d2 of the second smoke-blocking part 3.35 is less than the width dimension d3 of the third smoke-blocking part 3.36. Figure 5 At this time, the first smoke-blocking part 3.34, the second smoke-blocking part 3.35 and the third smoke-blocking part 3.36 together form an inverted triangle-shaped diversion structure. After the smoke flowing from bottom to top hits the smoke-blocking structure, not only will the flow velocity be slowed down, but the air flow will also be divided into a stream of air flow close to the left insertion hole 3.32 and another stream of air flow close to the right insertion hole 3.32. Realize: When the heat exchange pipes 3.2 are inserted into the insertion holes 3.32 of the heat exchange fins 3.3, it can better drive the high-temperature smoke to flow towards the heat exchange pipes 3.2 to improve the heat exchange effect. Figure 6 Shown, the width dimension d1 of the first smoke-blocking part 3.34 is less than the width dimension d2 of the second smoke-blocking part 3.35, and the width dimension d2 of the second smoke-blocking part 3.35 is less than the width dimension d3 of the third smoke-blocking part 3.36.

[0095] At this time, the first smoke-blocking part 3.34, the second smoke-blocking part 3.35 and the third smoke-blocking part 3.36 together form an "inverted triangle"-type diversion structure. After the smoke flowing from bottom to top hits the smoke-blocking structure, not only will the flow velocity be slowed down, but the air flow will also be divided into a stream of air flow close to the left insertion hole 3.32 and another stream of air flow close to the right insertion hole 3.32. Realize: When the heat exchange pipes 3.2 are inserted into the insertion holes 3.32 of the heat exchange fins 3.3, it can better drive the high-temperature smoke to flow towards the heat exchange pipes 3.2 to improve the heat exchange effect.

[0096] Moreover, the smoke-blocking structure in this embodiment is composed of three smoke-blocking parts spaced vertically. There is sufficient space between the smoke-blocking parts for the air flow to flow, avoiding excessive blockage of the air flow, and optimizing the smoothness of the air flow while improving the heat exchange effect.

[0097] Vertically (in the up-down direction in the figure), the first smoke-blocking part 3.34 can be configured to be lower than the centers of the two insertion holes 3.32 (the center of the insertion hole, which is the center position when the insertion hole is circular). That is, as shown in the figure Figure 5 In the up-down direction), the first smoke-blocking part 3.34 can be configured to be lower than the centers of the two insertion holes 3.32 (the center of the insertion hole, which is the center position when the insertion hole is circular). That is, as shown in the figure Figure 6As described above, the first smoke-blocking part 3.34 is lower than the center of the left insertion hole 3.32 and also lower than the center of the right insertion hole 3.32. The following is achieved: the first smoke-blocking part 3.34 can better drive the air flow flowing from bottom to top to flow towards the insertion holes 3.32 on both sides; and there is more space for the air flow to smoothly flow upwards.

[0098] Further, in the vertical direction (the up-and-down direction in the attachment Figure 5 ), the third smoke-blocking part 3.36 is configured to be higher than the two insertion holes 3.32; that is, the third smoke-blocking part 3.36 is higher than the left insertion hole 3.32 and also higher than the right insertion hole 3.32. So that the third smoke-blocking part 3.36 can form a greater flow-blocking effect at a higher position, better suspend the air flow in the area where the insertion holes 3.32 are located on the heat exchange fins 3.3, extend the time for the air flow to be in thermal contact with the heat exchange fins 3.3, and improve the heat exchange effect. And the lower end surface of the third smoke-blocking part 3.36 is an arc surface that bulges downward in the middle; to optimize the smoothness of the air flow and reduce the possibility of vortex formation.

[0099] Still further, as shown in the attachment Figure 5 , the second smoke-blocking part 3.35 includes a first guide plate 3.351 that extends obliquely (for example, in the attachment Figure 5 , it extends obliquely with the left side higher and the right side lower), and it is configured to guide the smoke flowing from bottom to top to the upper end of one insertion hole 3.32.

[0100] The second smoke-blocking part 3.35 further includes a second guide plate 3.352 that extends obliquely (for example, in the attachment Figure 5 , it extends obliquely with the right side higher and the left side lower), and it is configured to guide the smoke flowing from bottom to top to the upper end of the other insertion hole 3.32. And the lower end of the first guide plate 3.351 is close to or in contact with the lower end of the second guide plate 3.352.

[0101] In this way, the air flow can be better guided to the upper end of the insertion hole 3.32 where it is not easy to come into contact with the hot air flow; especially when a heat exchange pipe 3.2 is inserted into the insertion hole 3.32, the above-mentioned setting of the second smoke-blocking part 3.35 can better guide the smoke to the shaded side of the heat exchange pipe 3.2 (that is, the upper end surface of the heat exchange pipe 3.2 facing away from the air flow), so as to improve the heat exchange effect.

[0102] Similarly, as shown in the attachment Figure 5 , a plurality of flow-blocking columns 3.33 that are arranged around the upper half of the insertion hole 3.32 can also be convexly provided on one side surface of the fin body 3.31. In this embodiment, the flow-blocking columns 3.33 and the smoke-blocking structure are arranged on the same side surface of the fin body 3.31.

[0103] To increase the contact area with the heat exchange pipe 3.2, the hole wall of the insertion hole 3.32 may further extend with an extension wall 3.321 that protrudes on one side of the fin body 3.31.

[0104] At this time, the extension wall 3.321 and the smoke blocking structure are preferably arranged on the same side of the fin body 3.31, and the protruding height of the extension wall 3.321 is greater than the protruding height of the smoke blocking structure; moreover, the outer edge of the protruding end of the extension wall 3.321 is provided with a plurality of support ends 3.322 that extend in the peripheral direction of the insertion hole 3.32. In this way, when multiple heat exchange fins 3.3 are stacked, the support ends 3.322, as a support structure, will protect the smoke blocking structure, ensuring that the smoke blocking structure can stably and smoothly change the airflow as described above according to requirements.

[0105] The above-mentioned first smoke blocking part 3.34, second smoke blocking part 3.35, third smoke blocking part 3.36 and flow blocking column 3.33 are all preferably formed by flanging or pressurizing the fin body 3.31, so as to form the above-mentioned structure while avoiding excessive increase in the overall weight of the heat exchange fin 3.3.

[0106] On the above basis, as shown in the appendix Figure 5 The fin body 3.31 may also be provided with an overflow hole 3.38 at the upper end of the insertion hole 3.32 to improve the smoothness of the overall airflow. Moreover, a flow blocking part 3.37 that protrudes on one side of the fin body 3.31 may also be provided at the upper end of the overflow hole 3.38 to block the airflow flowing upward from the overflow hole 3.38, better avoiding excessive overflow of the airflow from the overflow hole 3.38, so as to overall extend the time of the airflow's thermal contact with the heat exchange fin 3.3 and improve the heat exchange effect. The flow blocking part 3.37 is preferably formed by flanging the edge of the fin body 3.31.

[0107] 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 the flue gas to flow from the smoke guide channel 2.1 into the heat exchange channel 3.11.

[0108] The fan assembly 4 can be connected to the heat exchange housing 3.1 and placed at the upper end opening of the heat exchange channel 3.11, and is configured to: suck the flue gas in the smoke guide channel 2.1. To drive the flue gas to flow from the smoke guide channel 2.1 into the heat exchange channel 3.11. At this time, the fan assembly 4 is also provided with a smoke exhaust pipe for discharging the sucked flue gas in a directional manner, and this smoke exhaust pipe is used to communicate with the smoke exhaust port in the building to discharge the flue gas in a directional manner.

[0109] The blower assembly 4 can also be connected to the burner 1, placed at the opening at the lower end of the air intake passage 1.12, and configured to: blow the flue gas in the flue gas passage 2.1 upward, so as to drive the flue gas to flow from the flue gas passage 2.1 into the heat exchange passage 3.11. At this time, the upper end opening of the heat exchange passage 3.11 is used to communicate with the smoke exhaust port in the building.

[0110] In summary, the combustion heat exchange assembly (including the combustion assembly and the heat exchanger 3) and the blower assembly 4 together constitute the main components of the gas water heater. In addition, the gas water heater also includes several electrical components arranged outside the combustion heat exchange assembly. When the combustion heat exchange assembly operates as described above, there will be problems: the high-temperature heat inside the flue gas housing 2 is likely to overflow, which will not only cause the surface temperature of the flue gas housing 2 to be too high, affecting the service life of the flue gas housing 2, but also have an adverse impact on the electrical components outside the combustion heat exchange assembly, and in severe cases, will greatly reduce the service life of the gas water heater.

[0111] Based on this, a combustion heat exchange assembly that can block the overflow of heat in the flue gas housing 2 and can better reduce the surface temperature of the flue gas housing 2 is needed. And a gas water heater with such a combustion heat exchange assembly is proposed.

[0112] As a form, a water cooling structure can be arranged on the outer surface of the flue gas housing 2 to solve the above problems. However, setting up a water cooling structure often requires a complex pipeline structure, resulting in problems such as complex pipeline structure and difficult installation of the combustion assembly; moreover, in order to better prevent water leakage and water body corrosion, the water cooling pipeline structure often requires a large cost.

[0113] In order to solve the above problems while better simplifying the structure and reducing costs, this application proposes: a combustion assembly that can block the heat from dissipating outward without using water and can better avoid water cooling problems. And a gas water heater with such a combustion assembly is proposed.

[0114] As an example, as shown in the attached Figure 3 and the attached Figure 7 shown, the combustion assembly in this embodiment further includes: a heat insulation structure formed in the side wall of the flue gas passage 2.1.

[0115] Specifically, the heat insulation structure includes: a near heat flow cavity 2.2a and a far heat flow cavity 2.2b arranged in the side wall of the flue gas passage 2.1, the near heat flow cavity 2.2a is placed between the far heat flow cavity 2.2b and the flue gas passage 2.1; an over-flow hole 2.211 for connecting the near heat flow cavity 2.2a and the far heat flow cavity 2.2b; an air outlet hole 2.4 for connecting the near heat flow cavity 2.2a and the flue gas passage 2.1; a first air inlet hole 2.3 for connecting the far heat flow cavity 2.2b and the external space of the flue gas housing 2.

[0116] For example, the attachedFigure 3 and attached Figure 7 As shown, in this embodiment, a heat-blocking cavity 2.2 with a cavity structure is provided in the side wall of the smoke guiding channel 2.1. For example, attached Figure 8 As shown, the smoke guiding housing 2 in this embodiment mainly includes an inner layer housing 2a with a smoke guiding channel 2.1 inside, and an outer layer plate member 2b fixedly connected to the outer periphery of the inner layer housing 2a through, for example, screws. There is a spaced part between the inner layer housing 2a and the outer layer plate member 2b, and this part forms the heat-blocking cavity 2.2.

[0117] A partition plate 2.21 extending vertically is provided in the heat-blocking cavity 2.2, which divides the heat-blocking cavity 2.2 into a near heat flow cavity 2.2a and a far heat flow cavity 2.2b, and the near heat flow cavity 2.2a is located between the far heat flow cavity 2.2b and the smoke guiding channel 2.1.

[0118] At the same time, an air outlet channel 2.4 with a hole structure is provided in a side wall of the heat-blocking cavity 2.2 close to the smoke guiding channel 2.1 in the transverse direction. One end opening of the air outlet channel 2.4 is communicated with the smoke guiding channel 2.1, and the other end opening is communicated with the near heat flow cavity 2.2a.

[0119] A first air inlet channel 2.3 with a hole structure is provided in a side wall of the heat-blocking cavity 2.2 far from the smoke guiding channel 2.1 in the transverse direction. One end opening of the first air inlet channel 2.3 is communicated with the far heat flow cavity 2.2b, and the other end opening is communicated with the external space of the smoke guiding housing 2.

[0120] An air flow through hole 2.211 with a hole structure is provided in the partition plate 2.21. One end opening of the air flow through hole 2.211 is communicated with the near heat flow cavity 2.2a, and the other end opening is communicated with the far heat flow cavity 2.2b.

[0121] At this time, when a flame is formed in the combustion zone of the smoke guide channel 2.1, it consumes oxygen and fuel gas and forms high-temperature flue gas that rises directly, creating a low-pressure area in the smoke guide channel 2.1. At this time, external air enters the far heat flow cavity 2.2b from the first air inlet channel 2.3, flows into the near heat flow cavity 2.2a through the flow-through hole 2.211, and then flows out through the air outlet channel 2.4 into the smoke guide channel 2.1. As a result, a flowing air current, called the heat-resistant air current, can be formed in the heat-resistant cavity 2.2. This heat-resistant air current forms air-cooled heat insulation, which can bring back the heat dissipated from the surface of the smoke guide housing 2 to the smoke guide channel 2.1. It can not only block the heat formed by the flame combustion in the smoke guide housing 2 from overflowing outward, effectively controlling the surface temperature of the combustion assembly, but also bring back the dissipated heat to the smoke guide channel 2.1 for heat exchange with the heat exchanger 3, improving the overall effective heat output rate of the combustion assembly. At the same time, the above heat-resistant structure does not require an additional complex water pipe structure, has a simpler and easier-to-install structure, and does not need to spend a large cost to handle the control of the water cooling circuit and the erosion problem of the water circuit, thus better avoiding the problems existing in water cooling.

[0122] In the above solution, as shown in the attached Figure 9 and the attached Figure 10 figures, a flow guide portion 2.6 protruding into the smoke guide channel 2.1 can also be provided on the side wall of the smoke guide channel 2.1.

[0123] Specifically, the inside of the flow guide portion 2.6 is provided with a cavity and is connected to the near heat flow cavity 2.2a. Moreover, the outer wall of the flow guide portion 2.6 (i.e., the side wall of the flow guide portion 2.6 that protrudes outward and is used to contact the air current in the smoke guide channel 2.1) includes a drainage wall 2.61 facing the combustion port 1.11 (i.e., facing the air current after the air current is output from the combustion port 1.11), a backflow wall 2.63 facing away from the combustion port 1.11 (i.e., facing away from the air current after the air current is output from the combustion port 1.11), and a connecting wall 2.62 that extends vertically (vertically or arcuately) and connects the drainage wall 2.61 and the backflow wall 2.63. That is, the upper end of the connecting wall 2.62 is connected to the backflow wall 2.63, and the lower end is connected to the drainage wall 2.61 to connect the drainage wall 2.61 and the backflow wall 2.63. For example, as shown in the attached Figure 8 figures, the outer wall of the flow guide portion 2.6 includes a drainage wall 2.61 facing downward, a backflow wall 2.63 facing upward, and a connecting wall 2.62 that extends arcuately vertically.

[0124] Among them, the diversion wall 2.61 is inclined so as to guide the airflow flowing upward from the side wall of the smoke guide channel 2.1 to the center of the smoke guide channel 2.1 (the area where the axis of the smoke guide channel 2.1 is located). In this way, on the one hand, the airflow (air, gas, high-temperature flue gas, etc.) can be better gathered at the center of the smoke guide channel 2.1 to improve the combustion efficiency and heat concentration rate, and then the heat can be better concentrated and output, facilitating better utilization of the heat subsequently; on the other hand, it can synchronously drive the airflow away from the side wall of the smoke guide channel 2.1 to further weaken the effect of heat transfer outward.

[0125] At this time, as a way, the air outlet channel 2.4 can be arranged on the backflow wall 2.63.

[0126] Or, as another way, the air outlet channel 2.4 is arranged on the connecting wall 2.62; and the air outlet channel 2.4 is preferably arranged to extend obliquely so that after the airflow in the heat insulation cavity 2.2 flows out from the air outlet channel 2.4, it can be conveyed obliquely upward. It is realized that the airflow flowing out from the air outlet channel 2.4 into the smoke guide channel 2.1 can better conform to the flow of the rising flue gas in the smoke guide channel 2.1, reduce the unnecessary airflow impact, and at the same time improve the smoothness and stability of the rising flow of the flue gas and the rising flow of the heat insulation airflow, thereby improving the stability of the heat output of the combustion component while optimizing the blocking effect of the overflow heat.

[0127] Regardless of the above-mentioned method, the airflow formed by combustion in the smoke guide channel 2.1 is not likely to have an unnecessary obstructive effect on the airflow in the heat insulation cavity 2.2, so that the heat insulation airflow for heat blocking as described above can always be smoothly formed in the heat insulation cavity 2.2.

[0128] Moreover, when the air outlet channel 2.4 is arranged on the connecting wall 2.62, due to the guiding effect of the diversion wall 2.61 on the airflow, it will drive the diameter of the smoke guide channel 2.1 at the connecting wall 2.62 to decrease, and the flow velocity will increase and the fluid pressure will decrease in this area; thus, it can better attract the airflow in the heat insulation cavity 2.2, and further improve the smoothness of the formation and circulation of the heat insulation airflow (the airflow of external air entering the heat insulation cavity 2.2 from the first air inlet channel 2.3 and then flowing out from the air outlet channel 2.4 into the smoke guide channel 2.1), so as to improve the overall blocking effect on the overflow heat and better reduce the surface temperature of the smoke guide housing 2.

[0129] Furthermore, when the diversion part 2.6 is provided, as shown in the appendix Figure 12As shown, the side wall portion of the smoke guide channel 2.1 can also be formed in a bent shape with a stepped flow portion 2.11 that extends horizontally and is disposed below the diversion portion 2.6. A supplementary air hole channel 2.12 is provided in the stepped flow portion 2.11. The supplementary air hole channel 2.12 is a channel provided in the stepped flow portion 2.11. The upper end of the channel is connected to the smoke guide channel 2.1, and the lower end is open, so that the air in the external space of the smoke guide housing 2 can enter the smoke guide channel 2.1 through the supplementary air hole channel 2.12.

[0130] In this way, by providing the supplementary air hole channel 2.12, on the one hand, it can further increase the intake volume of air, so that the gas can burn more fully. On the other hand, combined with the setting of the above-mentioned diversion portion 2.6, with the same other settings, increasing the supplementary air hole channel 2.12 can increase the overall intake volume, and then can better increase the gas flow rate in the smoke guide channel 2.1 at the connection wall 2.62, further assisting in the formation and smooth flow of the heat-blocking air flow, so as to better block the heat in the smoke guide channel 2.1 from overflowing outward.

[0131] In this embodiment, the supplementary air hole channel 2.12 is configured to extend vertically, so that the air in the external space can flow upward into the smoke guide channel 2.1 from the supplementary air hole channel 2.12 to adapt to the upward discharge of the smoke. In this way, the air flow can not only supplement the air as described above and increase the air flow rate, but also, in some cases, form an air curtain that flows upward close to the side wall of the smoke guide channel 2.1, better blocking the heat in the smoke guide channel 2.1 from overflowing outward and further improving the heat-blocking effect.

[0132] In any of the above solutions, the specific number and height positions of the first air intake channel 2.3, the air outlet channel 2.4, and the overflow channel 2.211 can be set according to requirements.

[0133] In this embodiment, as shown in the attached Figure 7 and the attached Figure 8 As shown, at least two first air intake channels 2.3 can be provided. The two first air intake channels 2.3 are spaced apart vertically. Among them, one first air intake channel 2.3 is connected to the upper end region of the far heat flow cavity 2.2b; the other first air intake channel 2.3 is connected to the lower end region of the far heat flow cavity 2.2b. (In the vertical direction, by trisecting the far heat flow cavity 2.2b, the far heat flow cavity 2.2b is sequentially divided into an upper end region, a middle region, and a lower end region from top to bottom.)

[0134] In this way, the heat-blocking structure has two air inlets spaced apart vertically, so as to cover a larger air intake area, improve the air intake smoothness and air intake volume when the air flow flows into the far heat flow cavity 2.2b during operation, and then can better form the above-mentioned heat-blocking air flow to improve the heat-blocking effect.

[0135] At this time, there are at least two ways to set the air outlet channel 2.4. Specifically:

[0136] In this embodiment, as one way:

[0137] As shown in the appendix Figure 9 As shown, there are at least two air outlet channels 2.4, and the two air outlet channels 2.4 are spaced apart vertically; and, among them: one air outlet channel 2.4 is communicated with the upper end area of the near heat flow cavity 2.2a; the other air outlet channel 2.4 is communicated with the lower end area of the near heat flow cavity 2.2a. (In the vertical direction, by equally dividing the near heat flow cavity 2.2a into three parts, the near heat flow cavity 2.2a is sequentially divided from top to bottom into: the upper end area, the middle area, and the lower end area.)

[0138] In this way, as shown in the appendix Figure 9 As shown, the air flow flowing into the near heat flow cavity 2.2a will be divided into two paths. One path of air flow circulates upward in the near heat flow cavity 2.2a and flows into the smoke guiding channel 2.1 through one air outlet channel 2.4 at the upper end; the other path of air flow circulates downward in the near heat flow cavity 2.2a and flows into the smoke guiding channel 2.1 through the other air outlet channel 2.4 at the lower end. A larger area of heat-blocking air flow can be formed in the near heat flow cavity 2.2a, improving the heat-blocking effect.

[0139] Moreover, at this time, the flow-through hole 2.211 can be configured such that one end opening is communicated with the middle area of the near heat flow cavity 2.2a, and the other end opening is communicated with the middle area of the far heat flow cavity 2.2b. In this way, while forming a large-area air flow for heat blocking as described above, for both paths of air flow, they both have a short flow path, enabling each path of air flow to better and faster bring the heat dissipated to the near heat flow cavity 2.2a back to the smoke guiding channel 2.1, and it is not easy to have uneven heat blocking, so as to further improve the overall heat blocking effect.

[0140] Among them, for the other air outlet channel 2.4 placed at the lower end, it can be arranged in alignment with the combustion area. That is, the opening at the end of the other air outlet channel 2.4 away from the near heat flow cavity 2.2a is arranged in alignment with the combustion area; so that: the air flow output from the other air outlet channel 2.4 can be transported to the combustion area of the smoke guiding channel 2.1. In this way, the air with a certain amount of heat in the near heat flow cavity 2.2a can participate in the combustion in the combustion component, improving the overall combustion efficiency and combustion effect of the combustion component.

[0141] At this time, for the setting of the two air outlet channels 2.4, a guiding part 2.6 is arranged corresponding to each air outlet channel 2.4, and each air outlet channel 2.4 is arranged in the backflow wall 2.63 or the connecting wall 2.62 of the guiding part 2.6 that matches it.

[0142] As another way:

[0143] As shown in the appended Figure 10 and the appended Figure 11 As shown, the air outlet channel 2.4 is preferably connected to the upper end region of the near heat flow cavity 2.2a, achieving: air flow can flow into the near heat flow cavity 2.2a from the middle region of the near heat flow cavity 2.2a and flow out from the upper end region of the near heat flow cavity 2.2a.

[0144] At this time, in this embodiment, as shown in the appended Figure 11 and the appended Figure 12 As shown, a second air inlet channel 2.2a1 is further provided in the bottom wall of the near heat flow cavity 2.2a (i.e., the cavity wall at the bottom of the near heat flow cavity 2.2a) to form a heat-resistant air flow with a larger area in the near heat flow cavity 2.2a and improve the heat blocking effect.

[0145] Furthermore, that is, the second air inlet channel 2.2a1 is a vertically penetrating channel provided in the bottom wall of the near heat flow cavity 2.2a. The upper end of the channel is connected to the near heat flow cavity 2.2a, and the lower end is open, so that: air in the external space can flow upward into the near heat flow cavity 2.2a from the second air inlet channel 2.2a1 in a manner adapted to the upward discharge of the flue gas. In this way, driven by the upward flow of the high-temperature flue gas, the air in the external space of the smoke guide housing 2 can flow more smoothly upward into the near heat flow cavity 2.2a and then flow smoothly upward to the air outlet channel 2.4 to better and more stably form a continuously flowing heat-resistant air flow and optimize the heat blocking effect of the overflowing heat.

[0146] At this time, the flow-through channel 2.211 in this embodiment can also be configured such that one end opening is connected to the middle region of the near heat flow cavity 2.2a, and the other end opening is connected to the middle region of the far heat flow cavity 2.2b. Referring to the description of the air flow in the near heat flow cavity 2.2a above, the air flow balance in the far heat flow cavity 2.2b can be improved.

[0147] Moreover, further, when the second air inlet channel 2.2a1 is provided:

[0148] On at least one side wall of the near heat flow cavity 2.2a, there can also be provided a convex portion that protrudes into the near heat flow cavity 2.2a and is opposite to the central region of the smoke guide channel 2.1 (the region where the axis of the smoke guide channel 2.1 is located, which is also the region where high-temperature flue gas accumulates) in the horizontal direction. The setting of this convex portion makes: there is a narrow mouth area with a reduced diameter in the near heat flow cavity 2.2a; for example, by setting the convex portion, it makes: in the vertical direction, the diameter (the diameter or size of the cavity opening) of the near heat flow cavity 2.2a is arranged in a large, small, large pattern (i.e., first decreasing and then increasing); and, the partially reduced diameter region (narrow mouth area) of the near heat flow cavity 2.2a is opposite to the central region of the smoke guide channel 2.1 in the horizontal direction.

[0149] For example, as shown in the appendix Figure 12 As shown in the figure, on one side wall of the near heat flow cavity 2.2a that is laterally close to the smoke guide channel 2.1, there is provided: a first convex portion 2.2a that is laterally opposite to the central region of the smoke guide channel 2.1 and protrudes toward the near heat flow cavity 2.2a.

[0150] By providing the convex portion, when the air flow in the near heat flow cavity 2.2a flows through the narrow opening region that is laterally opposite to the central region of the smoke guide channel 2.1, the flow rate can be increased to a certain extent. It can be achieved that: not only can the contact area between the air flow and the smoke guide housing 2 be increased, and the heat transferred to the side wall of the smoke guide channel 2.1 can be better brought back into the smoke guide channel 2.1 to optimize the heat insulation effect; but also according to the working characteristics of the combustion component in the gas water heater, in the case of a certain air flow rate, the region where heat is more likely to overflow can pass through a faster air flow to bring the heat back into the smoke guide channel 2.1 more quickly; while the region where the heat overflows more slowly passes through a slower and larger air flow rate to stably, slowly and fully transfer heat to the side wall of the smoke guide channel 2.1 and bring the heat back into the smoke guide channel 2.1, thereby improving the overall heat insulation effect.

[0151] In some solutions, in the direction from bottom to top, the cross-sectional area of the convex portion can gradually increase to better guide the air flow to flow smoothly from bottom to top in the near heat flow cavity 2.2a.

[0152] Furthermore, as shown in the appendix Figure 12 As shown in the figure, on the side wall of the near heat flow cavity 2.2a facing away from the smoke guide channel 2.1, there is a part that is laterally aligned with the convex portion (that is: the partition plate 2.21 has a part that is laterally aligned with the convex portion), and some flow holes 2.211 are provided in this part. When the heat-blocking air flow is formed as described above, the air flow in the far heat flow cavity 2.2b can flow into the near heat flow cavity 2.2a more quickly through these flow holes 2.211, increasing the flow rate of the overall heat-blocking air flow, further optimizing and improving the blocking effect on the overflowing heat, and better reducing the surface temperature of the smoke guide housing 2.

[0153] The above description is only the preferred embodiment of the present invention and does not limit the scope of the present invention.

Claims

1. Combustion heat exchange component, 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 outwards; A heat exchanger (3) disposed above the burner (1), comprising a heat exchange shell (3.1), a heat exchange pipe (3.2) and heat exchange fins (3.3); the heat exchange shell (3.1) has a heat exchange channel (3.11); the heat exchange pipe (3.2) has a heat exchange portion disposed in the heat exchange channel (3.11); and the heat exchange fins (3.3) are disposed in the heat exchange channel (3.11) and fit the heat exchange portion; A smoke guide housing (2) having: a smoke guide channel (2.1) which is in communication with the combustion port (1.11) and discharges smoke generated by combustion upward into the heat exchange channel (3.11); the lower end opening of the smoke guide channel (2.1) is connected to the combustion port (1.11), so that a combustion zone for flame combustion is formed in the smoke guide channel (2.1); A heat-resistant structure is formed in the side wall of the smoke-guiding channel (2.1), and the heat-resistant structure comprises: A near heat flow cavity (2.2a) and a far heat flow cavity (2.2b) are arranged in the side wall of the smoke guiding channel (2.1), the near heat flow cavity (2.2a) being placed between the far heat flow cavity (2.2b) and the smoke guiding channel (2.1); A flow passage (2.211) for connecting the near heat flow cavity (2.2a) and the far heat flow cavity (2.2b); An air outlet passage (2.4) for connecting the near-heat flow cavity (2.2a) with the smoke guide passage (2.1); A first air inlet passage (2.3) for connecting the remote heat flow cavity (2.2b) with the external space of the smoke guide housing (2).

2. The combustion heat exchange assembly according to claim 1, characterized in that: At least two of the first air inlet holes (2.3) are provided, and the two first air inlet holes (2.3) are spaced apart in the vertical direction, wherein: One of the first air inlet holes (2.3) is connected to the upper end region of the far heat flow cavity (2.2b); Another of the first air inlet holes (2.3) is in communication with the lower end region of the distal heat flow cavity (2.2b).

3. The combustion heat exchange assembly according to claim 2, characterized in that: At least two of the air outlet channels (2.4) are provided, and the two air outlet channels (2.4) are spaced apart in the vertical direction, wherein: One of the air outlet passages (2.4) is connected to the upper end region of the near-heat flow cavity (2.2a); The other of the air outlet passages (2.4) is in communication with the lower end region of the near-heat flow cavity (2.2a).

4. The combustion heat exchange assembly according to claim 2, characterized in that: The air outlet channel (2.4) is in communication with the upper end region of the near-heat flow cavity (2.2a); Furthermore, the bottom wall of the near-heat-flow cavity (2.2a) is provided with a second air inlet passage (2.2a1) for connecting the lower end region of the near-heat-flow cavity (2.2a) with the external space of the smoke guide housing (2).

5. The combustion heat exchange assembly according to any one of claims 1 to 4, characterized in that: The heat exchange fin (3.3) comprises a fin body (3.31), the fin body (3.31) having at least two pipe insertion holes (3.32), the two pipe insertion holes (3.32) being arranged at intervals in the transverse direction; The heat exchange pipe (3.2) extends in a curved manner and passes through the two insertion holes (3.32) in sequence; One side of the fin body (3.31) has a raised smoke blocking structure, which is placed in the middle area of ​​the two pipe insertion holes (3.32) and drives the smoke flowing from bottom to top to flow toward the pipe insertion holes (3.32) on both sides thereof.

6. The combustion heat exchange assembly according to claim 5, characterized in that: The smoke blocking structure comprises: a first smoke blocking portion (3.34), a second smoke blocking portion (3.35) and a third smoke blocking portion (3.36) which are sequentially arranged from bottom to top; In the direction from bottom to top, the width dimensions of the first smoke blocking portion (3.34), the second smoke blocking portion (3.35) and the third smoke blocking portion (3.36) gradually increase.

7. The combustion heat exchange assembly according to claim 6, characterized in that: The second smoke blocking part (3.35) comprises: A first guide plate (3.351) extending obliquely and configured to guide smoke flowing from bottom to top to an upper end of one of the insertion holes (3.32); A second guide plate (3.352) extending obliquely and configured to guide the smoke flowing from bottom to top to the upper end of another of the insertion holes (3.32); Furthermore, the lower end of the first guide plate (3.351) is close to or connected to the lower end of the second guide plate (3.352).

8. The combustion heat exchange assembly according to claim 1, characterized in that: The side wall of the smoke guiding channel (2.1) is provided with: a flow guiding portion (2.6) protruding into the smoke guiding channel (2.1); The interior of the flow guide (2.6) is arranged in a hollow cavity and is connected to the near-heat flow cavity (2.2a); Furthermore, the outer wall of the guide portion (2.6) comprises: A flow guide wall (2.61) facing the combustion port (1.11) is arranged in an inclined manner so as to guide the airflow flowing upward from the side wall of the smoke guide channel (2.1) to the center of the smoke guide channel (2.1); A back flow wall (2.63) facing away from the combustion port (1.11); and a connecting wall (2.62) extending in the vertical direction and connecting the flow guide wall (2.61) and the back flow wall (2.63); The air outlet channel (2.4) is arranged on the back flow wall (2.63).

9. The combustion heat exchange assembly according to claim 1, characterized in that: The side wall of the smoke guiding channel (2.1) is provided with: a flow guiding portion (2.6) protruding into the smoke guiding channel (2.1); The interior of the flow guide (2.6) is arranged in a hollow cavity and is connected to the near-heat flow cavity (2.2a); Furthermore, the outer wall of the guide portion (2.6) comprises: A flow guide wall (2.61) facing the combustion port (1.11) is arranged at an angle so as to guide the airflow at the side wall of the smoke guide channel (2.1) to the center of the smoke guide channel (2.1); A back flow wall (2.63) facing away from the combustion port (1.11); and a connecting wall (2.62) extending in the vertical direction and connecting the flow guide wall (2.61) and the back flow wall (2.63); The air outlet channel (2.4) is arranged on the connecting wall (2.62).

10. The combustion heat exchange assembly according to claim 9, characterized in that: The side wall of the smoke guiding channel (2.1) is bent to form: a step flow portion (2.11) extending laterally and disposed below the guide portion (2.6); An air supply hole (2.12) is provided in the stepped flow portion (2.11) for allowing air in the external space of the smoke guide housing (2) to enter the smoke guide channel (2.1).

11. Gas water heater, characterized in that: The invention comprises the combustion heat exchange component as claimed in any one of claims 1 to 10.

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