Combustion heat exchange system and gas water heater

Abstract

The invention relates to the technical field of household appliance equipment, in particular to a combustion heat exchange system and a gas water heater, the combustion heat exchange system comprises a combustor used for forming flames, and the combustion assembly is provided with a combustion port for spraying the flames outwards; the heat exchanger is arranged above 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 system, heat can be prevented from being dissipated outwards through a simple structure, and the combustion heat exchange system 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 system and a gas water heater. Background Art

[0002] A gas water heater is a household device that releases heat energy through gas combustion and rapidly heats water flow by means of a heat exchange device. This device mainly consists of several core components: a combustion heat exchange system (including a combustion assembly that generates high-temperature flames and a heat exchanger that realizes gas-water heat conduction through finned heat exchange tubes), a fan system (including key components such as a turbine fan), and supporting pipelines and an electrical control unit.

[0003] During the implementation of the current technology, in response to the thermal impact of the high temperature generated by the operation of combustion appliances on adjacent electronic components, the industry generally adopts two types of heat dissipation solutions: the first is to integrate a circulating cooling water circuit on the surface of the combustion chamber housing, and the second is to add an active air cooling device in the peripheral area. However, it has been verified through actual tests that:

[0004] For the circulating water cooling heat dissipation method, its cooling channels need to be arranged in a three-dimensional space staggered with the combustion chamber, resulting in the complication of the component assembly process; in order to prevent coolant leakage and oxidation corrosion problems of metal pipelines, high-precision sealed pipes must be selected and a surface protection treatment process must be implemented, leading to a significant increase in raw material costs; after long-term operation of the equipment, scale deposition may occur, resulting in the attenuation of heat dissipation efficiency and an increase in later maintenance costs.

[0005] For the active air cooling heat dissipation solution, since a separate heat dissipation fan module needs to be installed, it not only generates additional component purchase costs, but also requires a dedicated air guide channel and an independent power supply circuit system to be designed, resulting in an increase in the complexity of the overall internal layout of the machine.

[0006] In summary, the above two conventional heat dissipation technologies both have technical defects such as high processing costs and insufficient economy. 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 system that combines the combustion characteristics of gas and can block 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 system.

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

[0010] A combustion heat exchange system, comprising:

[0011] A burner for forming a flame, and the combustion assembly has a combustion port for the flame to spray outwards;

[0012] A heat exchanger placed above the burner, which includes a heat exchange housing, heat exchange pipes and heat exchange fins. There is a heat exchange channel in the heat exchange housing. The heat exchange pipes have heat exchange parts placed in the heat exchange channel. The heat exchange fins are placed in the heat exchange channel and are in contact with the heat exchange parts.

[0013] A smoke guide housing detachably fixed to the burner, which has: a smoke guide channel connected to the combustion port and discharging the smoke generated by combustion upward into the heat exchange channel. The lower end opening of the smoke guide channel is connected to the combustion port so that a combustion area for the flame to burn is formed in the smoke guide channel.

[0014] A heat insulation structure is formed in the side wall of the smoke guide channel. The heat insulation structure includes:

[0015] A heat insulation cavity arranged in the side wall of the smoke guide channel;

[0016] An air outlet channel for communicating the heat insulation cavity with the smoke guide channel;

[0017] A first air inlet channel for communicating the middle area of the heat insulation cavity with the external space of the smoke guide housing.

[0018] In some solutions, at least two air outlet channels are provided. The two air outlet channels are spaced apart vertically. Among them:

[0019] One air outlet channel is connected to the upper end area of the heat insulation cavity;

[0020] The other air outlet channel is connected to the lower end area of the heat insulation cavity.

[0021] In some solutions, the air outlet channel is connected to the upper end area of the heat insulation cavity;

[0022] Moreover, a second air inlet channel for communicating the lower end area of the heat insulation cavity with the external space of the smoke guide housing is arranged in the bottom wall of the heat insulation cavity.

[0023] In some solutions, the heat exchange fins include a fin body, which has at least two insertion tube holes. The two insertion tube holes are spaced apart horizontally;

[0024] The heat exchange pipes extend in a curved manner and sequentially pass through the two insertion tube holes;

[0025] One side surface of the fin body has a protruding smoke blocking structure. The 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.

[0026] In some solutions, the smoke blocking structure includes: a first smoke blocking part, a second smoke blocking part and a third smoke blocking part arranged at intervals from bottom to top;

[0027] In the up - to - down direction, the width dimensions of the first smoke - blocking part, the second smoke - blocking part, and the third smoke - blocking part gradually increase.

[0028] In some solutions, vertically, the first smoke - blocking part is configured to be lower than the centers of the two insertion holes.

[0029] In some solutions, vertically, the third smoke - blocking part is configured to be higher than the two insertion holes;

[0030] And the lower end face of the third smoke - blocking part is an arc - shaped surface that bulges downward.

[0031] In some solutions, the second smoke - blocking part includes:

[0032] A first guide plate that extends obliquely and is configured to divert the smoke flowing from bottom to top to the upper end of one insertion hole;

[0033] A second guide plate that extends obliquely and is configured to divert the smoke flowing from bottom to top to the upper end of the other insertion hole;

[0034] And the lower end of the first guide plate is close to or in contact with the lower end of the second guide plate.

[0035] In some solutions, the side wall of the smoke - guiding channel is provided with a diversion part that protrudes into the smoke - guiding channel;

[0036] The inside of the diversion part is provided as a cavity and is connected to the heat - resistant cavity;

[0037] And the outer wall of the diversion part includes:

[0038] A drainage wall facing the combustion port, which is obliquely arranged to guide the airflow flowing upward from the side wall of the smoke - guiding channel to the center of the smoke - guiding channel;

[0039] A back - flow wall facing away from the combustion port;

[0040] And a connecting wall that extends vertically and connects the drainage wall and the back - flow wall;

[0041] The air outlet channel is arranged on the back - flow wall.

[0042] In some solutions, the side wall of the smoke - guiding channel is provided with a diversion part that protrudes into the smoke - guiding channel;

[0043] The inside of the diversion part is provided as a cavity and is connected to the heat - resistant cavity;

[0044] And the outer wall of the diversion part includes:

[0045] A drainage wall facing the combustion port, which is obliquely arranged to guide the airflow at the side wall of the smoke - guiding channel to the center of the smoke - guiding channel;

[0046] A backflow wall facing away from the combustion port;

[0047] And a connecting wall extending vertically and connecting the diversion wall and the backflow wall;

[0048] The air outlet channel is arranged on the connecting wall.

[0049] In some solutions, the side wall of the smoke guide channel is bent to form a stepped flow part that extends horizontally and is placed below the diversion part;

[0050] The stepped flow part is provided with a supplementary air hole channel for air in the external space of the smoke guide housing to enter the smoke guide channel.

[0051] A gas water heater includes the combustion heat exchange system described in any of the above solutions.

[0052] The main beneficial effects of the above technical solutions are as follows:

[0053] 1. By arranging 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 appliance.

[0054] 2. The overall heat resistance structure is simpler, which can better reduce the production cost.

[0055] 3. In addition to forming air-cooled heat insulation, the heat resistance air flow can also bring the dissipated heat back into the smoke guide channel to exchange heat with the heat exchanger, improving the overall effective heat output rate of the combustion appliance to form a high-efficiency gas combustion structure.

[0056] 4. By forming a heat resistance structure, when the combustion appliance 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.

[0057] 5. By making corresponding settings for the fins to form a smoke resistance structure, the heat exchange efficiency can be better improved.

[0058] 6. Connect one air outlet channel to the upper end area of the heat resistance cavity; connect the other air outlet channel to the lower end area of the heat resistance cavity, which can not only form a larger area of heat resistance air flow in the heat resistance cavity to improve the heat blocking effect; moreover, by forming two upper and lower air flows in the heat resistance cavity, while forming a large area of air flow for heat resistance as described above, for each air flow, it has a shorter flow path, enabling the air flow to better and faster bring the heat dissipated to the heat resistance cavity back into the smoke guide channel, so as to further improve the overall heat blocking effect.

[0059] 7. Connect the air outlet channel to the upper region of the heat insulation cavity, and a second air inlet channel is provided in the bottom wall of the heat insulation cavity. Driven by the upward flow of the high-temperature flue gas, the air in the external space of the smoke guide housing can flow more smoothly upward into the heat insulation cavity and then flow smoothly upward to the air outlet channel, so as to better and more stably form a continuously flowing heat insulation air flow and optimize the blocking effect of the overflowing heat.

[0060] 8. By providing the diversion part, on the one hand, the air flow (such as air, gas, and high-temperature flue gas) can be better gathered at the center of the smoke guide channel, so as to improve the combustion efficiency and heat concentration rate, and then better gather and output heat, which is convenient for subsequent better utilization of heat; on the other hand, it can simultaneously drive the air flow away from the side wall of the smoke guide channel to further weaken the effect of heat transfer outward.

[0061] 9. Further arrange the air outlet channel on the connecting wall, which can better attract the air flow in the heat insulation cavity, further improve the smoothness of the heat insulation air flow, so as to overall improve the blocking effect of the overflowing heat and better reduce the surface temperature of the smoke guide housing.

[0062] 10. By providing the air supplement channel, on the one hand, it can further increase the intake of air so that the gas can burn more fully; on the other hand, combined with the above-mentioned setting of the diversion part, when the other settings are the same, increasing the air supplement channel can increase the overall intake air volume, and then can better increase the gas flow rate in the smoke guide channel at the connecting wall, further providing assistance for the formation and smooth flow of the heat insulation air flow, so as to better block the heat in the smoke guide channel from overflowing outward.

[0063] Further or more detailed beneficial effects will be described in combination with specific embodiments in the specific implementation manner. Brief Description of the Drawings

[0064] The following further describes the present invention with reference to the drawings:

[0065] Figure 1 It is a schematic diagram of the internal structure of a gas water heater.

[0066] Figure 2 It is a schematic diagram of the installation structure of the combustion assembly.

[0067] Figure 3 It is a schematic cross-sectional view of the combustion assembly.

[0068] Figure 4 It is a schematic diagram of the structure of the heat exchanger.

[0069] Figure 5 It is a schematic diagram of the fin structure.

[0070] Figure 6 It is a front view schematic diagram of the fin.

[0071] Figure 7 It is a schematic cross-sectional view of the smoke guide housing.

[0072] Figure 8 It is a schematic enlarged view of the air outlet passage.

[0073] Figure 9 It is a schematic cross-sectional view of the smoke guide housing when two air outlet passages are provided.

[0074] Figure 10 It is a schematic cross-sectional view of the smoke guide housing when a second air inlet passage is provided.

[0075] Figure 11 It is a schematic enlarged view of the second air inlet passage.

[0076] Figure 12 It is a schematic diagram of the setting of the supplementary air passage.

[0077] Figure 13 It is a schematic diagram of the installation structure of the smoke guide housing.

[0078] Figure 14 It is a schematic diagram of an installation structure of the smoke guide housing when a protrusion is formed in the heat insulation cavity. Detailed implementation manners

[0079] The present invention will be specifically illustrated with reference to the embodiments as follows:

[0080] Embodiment:

[0081] A gas water heater, as shown in the appendix Figure 1 shown, mainly includes a water heater housing, and a combustion heat exchange system and a fan assembly 4 disposed inside the water heater housing. The combustion heat exchange system includes: a combustion assembly 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 assembly 4 is used to form a directional air flow in the combustion heat exchange system.

[0082] Specifically, as shown in the appendix Figure 1 shown, as an example, the combustion assembly includes a burner 1 and a smoke guide housing 2. The smoke guide housing 2 is detachably fixedly connected to the burner 1 by a detachable connection method such as screws (for example, detachably fixedly connected to the burner housing 1.1 hereinafter by a detachable connection method such as screws), which is convenient for maintaining, cleaning or replacing the smoke guide housing 2 in the later stage.

[0083] 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. Specifically, as shown in the appendix Figure 3Shown as an example, an opening facing upward is formed at the upper end of the burner housing 1.1, and this opening is the combustion port 1.11; moreover, several burner ports 1.2 are installed in the burner housing 1.1 in a cavity manner, and an air intake passage 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 (this ignition device 1.3 is a conventional device for ignition in gas water heaters and gas stoves, such as an electric spark ignition device, etc.).

[0084] A gas passage for gas to flow in is formed in the burner port 1.2. The lower end of this gas passage is used to connect to a gas transmission pipeline, and the upper end is communicated with the combustion port 1.11, so that gas can be transported to the combustion port 1.11 through the burner port 1.2.

[0085] The lower end of the air intake passage 1.12 is arranged in an open manner for air to flow in; the upper end is communicated with the combustion port 1.11, so that external air can be transported to the combustion port 1.11 from the air intake passage 1.12.

[0086] The smoke guide housing 2 is arranged above the burner 1, and the smoke guide housing 2 has: a smoke guide passage 2.1 that is communicated with the combustion port 1.11 and discharges the smoke generated by combustion upward. The smoke guide passage 2.1 can be a through hole arranged in the vertical direction in the smoke guide housing 2, and the lower end opening of this hole is communicated with the combustion port 1.11.

[0087] 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 guide 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 guide passage 2.1), so that a combustion area for the flame to burn is formed in the smoke guide passage 2.1. The channel diameter of the smoke guide passage 2.1 is often greater than or equal to the opening diameter of the combustion port 1.11.

[0088] During operation, the gas is transported from the gas passage inside the burner port 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. This combustion flame surges into the smoke guide passage 2.1 for combustion, so that a combustion area for the flame to burn is formed in the smoke guide passage 2.1. At this time, the smoke and heat generated by combustion enter the smoke guide passage 2.1 and flow upward under the guiding action of the smoke guide passage 2.1.

[0089] The heat exchanger 3 is placed above the smoke guide housing 2 and is used to exchange heat with the high-temperature smoke in the smoke guide passage 2.1 to form hot water.

[0090] Specifically, as shown in the appendixFigure 4 As an example, the heat exchanger 3 includes a heat exchange housing 3.1, which can be detachably connected to the smoke guide housing 2 or to other external support structures, such as the water heater housing, by means of screws. The heat exchange housing 3.1 has heat exchange channels 3.11 (see FIG. 1 ) with two ends connected. Figure 3 As 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] As shown in the Figure 5 accompanying drawings, 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 thereof. Achievements: By setting the smoke-blocking structure, not only the contact area of the heat exchange fin 3.3 for contacting the hot air flow is increased, the flow velocity of the air flow 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.

[0095] Furthermore, in this embodiment, the smoke-blocking structure includes: a first smoke-blocking portion 3.34, a second smoke-blocking portion 3.35, and a third smoke-blocking portion 3.36 that are arranged at intervals in sequence from bottom to top. And, 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 (such as the Figure 5 interval dimension between the two ends of the smoke-blocking portion in the left-right direction in the accompanying drawings) gradually increase. That is, as shown in the Figure 6 accompanying drawings, the width dimension d1 of the first smoke-blocking portion 3.34 is less than the width dimension d2 of the second smoke-blocking portion 3.35, and the width dimension d2 of the second smoke-blocking portion 3.35 is less than the width dimension d3 of the third smoke-blocking portion 3.36.

[0096] At this time, the first smoke-blocking portion 3.34, the second smoke-blocking portion 3.35, and the third smoke-blocking portion 3.36 together form an inverted triangle-shaped flow guiding structure. After the smoke flowing from bottom to top hits the smoke-blocking structure, not only the flow velocity will be slowed down, but also the air flow will be divided into one air flow close to the left insertion hole 3.32 and another air flow close to the right insertion hole 3.32. Achievements: When the heat exchange pipes 3.2 are inserted into the insertion holes 3.32 of the heat exchange fin 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.

[0097] Moreover, the smoke-blocking structure in this embodiment is composed of three smoke-blocking portions spaced vertically. There is sufficient space between the smoke-blocking portions 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.

[0098] Vertically (in the Figure 5 up-and-down direction in the accompanying drawings), the first smoke-blocking portion 3.34 can be configured to be lower than the center 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 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. Achievements: The first smoke-blocking part 3.34 can better drive the upward-flowing air to flow towards the two insertion holes 3.32 on both sides; and there is more space for the air to flow smoothly upwards.

[0099] 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 its left insertion hole 3.32 and also higher than its 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 hold back 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.

[0100] 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 upward-flowing flue gas to the upper end of one insertion hole 3.32.

[0101] 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 upward-flowing flue gas 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.

[0102] 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 flue gas to the shaded side of the heat exchange pipe 3.2 (that is, the upper end surface of the heat exchange pipe 3.2 that faces away from the air flow), so as to improve the heat exchange effect.

[0103] 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.

[0104] 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 surface of the fin body 3.31.

[0105] At this time, the extension wall 3.321 and the smoke blocking structure are preferably arranged on the same side surface of the fin body 3.31, and the protruding height of the extension wall 3.321 is greater than that 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 flow of the air flow as described above according to requirements.

[0106] The above-mentioned first smoke blocking portion 3.34, second smoke blocking portion 3.35, third smoke blocking portion 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.

[0107] 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 air flow. Moreover, a flow blocking portion 3.37 that protrudes on one side surface of the fin body 3.31 may also be provided at the upper end of the overflow hole 3.38 to block the air flow flowing upward from the overflow hole 3.38, better avoiding excessive overflow of the air flow from the overflow hole 3.38, so as to overall extend the time of heat contact between the air flow and the heat exchange fin 3.3 and improve the heat exchange effect. The flow blocking portion 3.37 is preferably formed by flanging the edge of the fin body 3.31.

[0108] The fan assembly 4 is a fan structure used in a gas water heater to form an air flow, and is configured to: form an air flow that drives the flue gas to flow from the smoke guide channel 2.1 into the heat exchange channel 3.11.

[0109] The fan assembly 4 can be connected to the heat exchange housing 3.1, 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 the smoke exhaust pipe is used to communicate with the smoke exhaust port in the building to discharge the flue gas in a directional manner.

[0110] The blower assembly 4 can also be connected to the burner 1 and placed at the opening at the lower end of the air intake passage 1.12, and is 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.

[0111] In summary, the combustion heat exchange system (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 system. When the combustion heat exchange system operates as described above, there will be a problem that 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 system, and in severe cases, will greatly reduce the service life of the gas water heater.

[0112] Based on this, a combustion heat exchange system 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 this combustion heat exchange system is proposed.

[0113] 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 setting up 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.

[0114] In order to solve the above problems while better simplifying the structure and reducing the cost, the present 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 this combustion assembly is proposed.

[0115] As an example, as shown in the attached Figure 3 and the attached Figure 5 The combustion assembly in this embodiment further includes a heat insulation structure formed in the side wall of the flue gas passage 2.1.

[0116] Specifically, the heat insulation structure includes a heat insulation cavity 2.2, an air outlet passage 2.4, and a first air inlet passage 2.3. To be exact, for example, as shown in the attached Figure 3 and the attached Figure 7As shown, the heat insulation cavity 2.2 is a cavity provided in the side wall of the smoke guide channel 2.1; the air outlet channel 2.4 is a hole provided in the side wall of the heat insulation cavity 2.2 that is laterally close to the smoke guide channel 2.1 and allows the heat insulation cavity 2.2 to communicate with the smoke guide channel 2.1; the first air inlet channel 2.3 can be a hole provided in the side wall of the heat insulation cavity 2.2 that is laterally away from the smoke guide channel 2.1 and allows the heat insulation cavity 2.2 to communicate with the external air, and the first air inlet channel 2.3 communicates with the middle region of the heat insulation cavity 2.2. (In the vertical direction, by trisecting the heat insulation cavity 2.2, the heat insulation cavity 2.2 is sequentially divided from top to bottom into: an upper region, a middle region, and a lower region.)

[0117] At this time, when a flame is formed in the combustion zone of the smoke guide channel 2.1, it will consume oxygen and fuel gas and form high-temperature flue gas that rises directly, creating a low-pressure area in the smoke guide channel 2.1; at this time, external air will enter the heat insulation cavity 2.2 from the first air inlet channel 2.3, flow through the heat insulation cavity 2.2, and then flow out to the smoke guide channel 2.1 from the air outlet channel 2.4, and then a flowing air current (as shown by the arrows in the attachment) can be formed in the heat insulation cavity 2.2, which is called the heat insulation air current; this heat insulation 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 control the surface temperature of the combustion component, 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 component. At the same time, the above heat insulation 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. Figure 7 In the above solution, as shown in the attachment, a flow guiding 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.

[0118] In the above solution, as shown in the attachment Figure 8 shown, a flow guiding 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.

[0119] Specifically, the inside of the flow guiding part 2.6 is provided with a cavity and is communicated with the heat insulation cavity 2.2; moreover, the outer wall of the flow guiding part 2.6 (i.e., the side wall of the convex outer surface of the flow guiding part 2.6 that is used to contact the airflow in the smoke guiding channel 2.1) includes: a diversion wall 2.61 facing the combustion port 1.11 (i.e., facing the airflow after the airflow 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 airflow after the airflow is output from the combustion port 1.11), and a connecting wall 2.62 that extends vertically (vertically or arcuately) and connects the diversion 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 diversion wall 2.61 to connect the diversion wall 2.61 and the backflow wall 2.63. For example, as shown in Figure 8 As shown, the outer wall of the flow guiding part 2.6 includes: a diversion wall 2.61 facing downward, a backflow wall 2.63 facing upward, and a connecting wall 2.62 that extends arcuately vertically.

[0120] Among them, the diversion wall 2.61 is inclined so as to be able to guide the airflow flowing upward from the side wall of the smoke guiding channel 2.1 to the center of the smoke guiding channel 2.1 (the area where the axis of the smoke guiding channel 2.1 is located). In this way, on the one hand, the airflow (air, gas, high-temperature flue gas, etc.) can be better aggregated at the center of the smoke guiding channel 2.1 to improve the combustion efficiency and heat concentration rate, and then the heat can be better concentrated and output, which is convenient for better utilization of heat subsequently; on the other hand, it can synchronously drive the airflow away from the side wall of the smoke guiding channel 2.1 to further weaken the effect of heat transfer outward.

[0121] At this time, as a way, the air outlet channel 2.4 can be arranged on the backflow wall 2.63.

[0122] 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 the airflow in the heat insulation cavity 2.2 can be conveyed obliquely upward after flowing out from the air outlet channel 2.4. Realize: the airflow flowing out from the air outlet channel 2.4 into the smoke guiding channel 2.1 can better conform to the flow of the rising flue gas in the smoke guiding 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.

[0123] Regardless of the above method, the airflow formed by combustion in the smoke guiding 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.

[0124] Moreover, when the air outlet channel 2.4 is provided in the connecting wall 2.62, due to the guiding effect of the diversion wall 2.61 on the air flow, the diameter of the smoke guiding channel 2.1 at the connecting wall 2.62 will be driven to decrease, resulting in an increase in flow velocity and a decrease in fluid pressure in this area. Furthermore, it can better attract the air flow in the heat-resistant cavity 2.2, further improving the smoothness of the formation and circulation of the heat-resistant air flow (the air flow that enters the heat-resistant cavity 2.2 from the first air inlet channel 2.3 and then flows out from the air outlet channel 2.4 to the smoke guiding channel 2.1), thereby improving the overall blocking effect on the overflowing heat and better reducing the surface temperature of the smoke guiding housing 2.

[0125] Furthermore, when the diversion part 2.6 is provided, as shown in the appendix Figure 12 As shown, the side wall part of the smoke guiding channel 2.1 can also be formed in a bent shape with: a step flow part 2.11 that extends horizontally and is placed below the diversion part 2.6. A supplementary air hole channel 2.12 is provided in the step flow part 2.11. The supplementary air hole channel 2.12 is a channel provided in the step flow part 2.11. The upper end of the channel is connected to the smoke guiding channel 2.1 and the lower end is open, so that the air in the external space of the smoke guiding housing 2 can enter the smoke guiding channel 2.1 through the supplementary air hole channel 2.12.

[0126] In this way, by providing the supplementary air hole channel 2.12, on the one hand, it can further increase the air intake volume, enabling the gas to burn more fully. On the other hand, combined with the setting of the above-mentioned diversion part 2.6, with the rest of the settings being the same, adding the supplementary air hole channel 2.12 can increase the overall air intake volume, thereby better increasing the gas flow velocity in the smoke guiding channel 2.1 at the connecting wall 2.62, further facilitating the formation and smooth circulation of the heat-resistant air flow, and better blocking the heat in the smoke guiding channel 2.1 from overflowing outward.

[0127] 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 guiding channel 2.1 from the supplementary air hole channel 2.12 in a manner that adapts 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 velocity; but also, in some cases, it can form an air curtain that flows upward close to the side wall of the smoke guiding channel 2.1, better blocking the heat in the smoke guiding channel 2.1 from overflowing outward and further improving the heat blocking effect.

[0128] In any of the above solutions, the specific number and height position of the air outlet channel 2.4 can be set according to requirements.

[0129] In this embodiment, as a way:

[0130] As shown in the appendix Figure 9As 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 connected to the upper region of the heat insulation cavity 2.2; the other air outlet channel 2.4 is connected to the lower region of the heat insulation cavity 2.2. In this way, as shown in the appendix Figure 9 As shown, the air flow flowing into the heat insulation cavity 2.2 from the first air inlet channel 2.3 will be divided into two paths. One path of air flow circulates upward in the heat insulation cavity 2.2 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 heat insulation cavity 2.2 and flows into the smoke guiding channel 2.1 through the other air outlet channel 2.4 at the lower end. It can not only form a larger area of heat insulation air flow in the heat insulation cavity 2.2 and improve the heat blocking effect, but also, by forming two upper and lower air flows in the heat insulation cavity 2.2, while forming a large area of air flow for heat insulation as described above, for each air flow, it has a shorter flow path, enabling the air flow to better and faster bring the heat dissipated to the heat insulation cavity 2.2 back to the smoke guiding channel 2.1, so as to further improve the overall heat blocking effect.

[0131] 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 heat insulation cavity 2.2 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 heat insulation cavity 2.2 can participate in the combustion in the combustion component, and can improve the overall combustion efficiency and combustion effect of the combustion component.

[0132] At this time, for the setting of the two air outlet channels 2.4, a flow 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 corresponding flow guiding part 2.6.

[0133] As another way:

[0134] As shown in the appendix Figure 10 and the appendix Figure 11 As shown, the air outlet channel 2.4 is preferably connected to the upper region of the heat insulation cavity 2.2, so as to achieve: the air flow can flow into the heat insulation cavity 2.2 from the middle region of the heat insulation cavity 2.2 and flow out from the upper region of the heat insulation cavity 2.2. In order to form a larger area of air flow in the heat insulation cavity 2.2, and then form a larger heat blocking area to improve the heat blocking effect on the overflow heat.

[0135] Furthermore, in this embodiment, as shown in the appendix Figure 10 and the appendix Figure 11 As shown, a second air inlet channel 2.7 is also arranged in the bottom wall of the heat insulation cavity 2.2 (that is, the cavity wall at the bottom of the heat insulation cavity 2.2). In this way, as shown in the appendixFigure 10 As shown, external air flows into the heat insulation chamber 2.2 from the first air inlet passage 2.3 and the second air inlet passage 2.7 simultaneously, and together they flow upward in the heat insulation chamber 2.2 and then into the smoke guiding passage 2.1. A heat insulation air flow with a larger area is formed in the heat insulation chamber 2.2, improving the heat blocking effect.

[0136] Furthermore, that is, the second air inlet passage 2.7 is a vertically penetrating passage provided on the bottom wall of the heat insulation chamber 2.2. The upper end of this passage is connected to the heat insulation chamber 2.2, and the lower end is open, so that: the air in the external space can flow upward into the heat insulation chamber 2.2 from the second air inlet passage 2.7 in adaptation to the upward discharge of the smoke. In this way, driven by the upward flow of the high-temperature smoke, the air in the external space of the smoke guiding housing 2 can flow upward into the heat insulation chamber 2.2 more smoothly and flow upward to the air outlet passage 2.4 smoothly, so as to better and more stably form a continuously flowing heat insulation air flow and optimize the heat blocking effect of the overflowing heat.

[0137] Based on the above scheme, in some schemes, for one side wall of the heat insulation chamber 2.2 located between the smoke guiding passage 2.1 and the heat insulation chamber 2.2, several heat guiding portions 2.24 protruding into the heat insulation chamber 2.2 can be provided on this side wall. In order to increase the contact area between the air flow and the side wall of the smoke guiding passage 2.1, and then improve the heat exchange efficiency between the air flow and the side wall of the smoke guiding passage 2.1, so that the air flow flowing through the heat insulation chamber 2.2 can bring more heat back into the smoke guiding passage 2.1.

[0138] In order to improve the overall heat blocking effect, multiple heat insulation structures as described above can also be provided around the smoke guiding passage 2.1, and the heat insulation chambers 2.2 in each heat insulation structure are interconnected to form an annular cavity surrounding the outer periphery of the smoke guiding passage 2.1, blocking the heat in the smoke guiding housing 2 from overflowing outward by 360 degrees.

[0139] At this time, as shown in the appendix Figure 13 As shown, the smoke guiding housing 2 mainly includes an inner layer housing 2a with a smoke guiding passage 2.1 inside, and an outer layer housing surrounding the inner layer housing 2a. A heat insulation chamber 2.2 is formed at intervals between the inner layer housing 2a and the outer layer housing. The outer layer housing includes a first outer layer plate 2b.1 and a second outer layer plate 2b.2. The first outer layer plate 2b.1 and the second outer layer plate 2b.2 are detachably connected by, for example, screws to form the outer layer housing. And, both the first outer layer plate 2b.1 and the second outer layer plate 2b.2 are preferably detachably fixedly connected to the inner layer housing 2a by, for example, screws. The air outlet passage 2.4 is provided on the inner layer housing 2a, and the first air inlet passage 2.3 is provided on the outer layer housing.

[0140] Based on the above scheme provided with the first air inlet passage 2.3 and the second air inlet passage 2.7, as shown in the appendixFigure 14 As shown, on at least one side wall of the heat insulation cavity 2.2, there may also be provided a protruding portion that protrudes into the heat insulation cavity 2.2 and is horizontally (in the horizontal direction) 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 often the region where high-temperature flue gas accumulates). The provision of this protruding portion makes it such that: in the vertical direction, the diameter (the diameter or size of the cavity opening) of the heat insulation cavity 2.2 is arranged in a large, small, large pattern (i.e., a pattern of decreasing first and then increasing); and, a partial region where the diameter of the heat insulation cavity 2.2 decreases is horizontally opposite to the central region of the smoke guide channel 2.1.

[0141] For example, as shown in the appendix Figure 14 On one side wall of the heat insulation cavity 2.2 that is horizontally close to the smoke guide channel 2.1, there is provided a first protruding portion 2.21 that is horizontally opposite to the central region of the smoke guide channel 2.1 and protrudes into the heat insulation cavity 2.2; or, on one side wall of the heat insulation cavity 2.2 that is horizontally far from the smoke guide channel 2.1, there is provided a second protruding portion 2.22 that is horizontally opposite to the central region of the smoke guide channel 2.1 and protrudes into the heat insulation cavity 2.2.

[0142] By providing the protruding portion, when the air flow in the heat insulation cavity 2.2 flows through the narrow opening region that is horizontally opposite to the central region of the smoke guide channel 2.1, the flow rate can be increased to a certain extent. This achieves: 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 components in the gas water heater, in the case of a certain air flow rate, regions where heat is more likely to overflow can have the heat brought back into the smoke guide channel 2.1 more quickly through a faster air flow; while for the remaining regions where heat overflows more slowly, the heat is brought back into the smoke guide channel 2.1 through a slower and larger air flow rate, stably, slowly, and fully transferring heat with the side wall of the smoke guide channel 2.1, thereby improving the overall heat insulation effect.

[0143] In some solutions, in the direction from bottom to top, the cross-sectional area of the protruding portion can gradually increase to better guide the air flow to flow smoothly from bottom to top in the heat insulation cavity 2.2.

[0144] Furthermore, as shown in the appendix Figure 14As shown, one side wall of the heat insulation cavity 2.2 facing away from the smoke guiding channel 2.1 (i.e., the side wall of the heat insulation cavity 2.2 that is laterally far from the smoke guiding channel 2.1) has a portion that is laterally aligned with the convex portion, and some first air inlet channels 2.3 are provided in this portion. When the heat insulation air flow is formed as described above, the external air flow can flow into the heat insulation cavity 2.2 more quickly through the first air inlet channels 2.3, increasing the flow rate of the overall heat insulation air flow, further optimizing and improving the blocking effect on the overflowing heat, and better reducing the surface temperature of the smoke guiding housing 2.

[0145] The above are only the preferred embodiments of the present invention and do not limit the scope of the present invention. Additionally, in the embodiments of the present invention, the terms "vertical", "horizontal", "front", "rear", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. It should be further noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", "fixation", etc. in the description should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A combustion heat exchange system, characterized in that, Comprising: A burner (1) for forming a flame, the burner (1) having a combustion port (1.11) through which the flame ejects outward; A heat exchanger (3) disposed above the burner (1), which includes a heat exchange housing (3.1), heat exchange pipes (3.2) and heat exchange fins (3.3). The heat exchange housing (3.1) has a heat exchange channel (3.11). The heat exchange pipes (3.2) have heat exchange portions 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 are in contact with the heat exchange portions; A smoke guiding housing (2) detachably fixed to the burner (1), which has therein: a smoke guiding channel (2.1) communicating with the combustion port (1.11) and discharging the smoke generated by combustion upward to the heat exchange channel (3.11), and the lower end opening of the smoke guiding channel (2.1) is connected to the combustion port (1.11) so that a combustion area for the flame to burn is formed in the smoke guiding channel (2.1); A heat insulation structure is formed in the side wall of the smoke guiding channel (2.1), and the heat insulation structure includes: A heat insulation cavity (2.2) provided in the side wall of the smoke guiding channel (2.1); An air outlet channel (2.4) for communicating the heat insulation cavity (2.2) with the smoke guiding channel (2.1); A first air inlet channel (2.3) for communicating the middle region of the heat insulation cavity (2.2) with the external space of the smoke guiding housing (2).

2. The combustion heat exchange system according to claim 1, wherein: At least two air outlet channels (2.4) are provided, and the two air outlet channels (2.4) are spaced apart vertically. Among them: One air outlet channel (2.4) communicates with the upper end region of the heat insulation cavity (2.2); The other air outlet channel (2.4) communicates with the lower end region of the heat insulation cavity (2.2).

3. The combustion heat exchange system according to claim 1, characterized in that: The air outlet channel (2.4) communicates with the upper end region of the heat insulation cavity (2.2); Moreover, a second air inlet channel (2.7) is provided in the bottom wall of the heat insulation cavity (2.2) for communicating the lower end region of the heat insulation cavity (2.2) with the external space of the smoke guiding housing (2).

4. The combustion heat exchange system according to any one of claims 1 to 3, characterized in that: The heat exchange fins (3.3) include a fin body (3.31), and the fin body (3.31) has at least two insertion holes (3.32), and the two insertion holes (3.32) are spaced apart horizontally; The heat exchange pipes (3.2) extend in a curved manner and sequentially pass through the two insertion holes (3.32); One side surface of the fin body (3.31) has a protruding smoke blocking structure, and the smoke blocking structure is disposed in the middle region between the two insertion holes (3.32) and drives the smoke flowing from bottom to top to flow towards the two insertion holes (3.32) on its two sides.

5. The combustion heat exchange system according to claim 4, characterized in that: The smoke blocking structure includes: a first smoke blocking portion (3.34), a second smoke blocking portion (3.35) and a third smoke blocking portion (3.36) arranged at intervals 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.

6. The combustion heat exchange system according to claim 5, wherein: Vertically, the first smoke-blocking part (3.34) is configured to be lower than the centers of the two insertion holes (3.32).

7. The combustion heat exchange system according to claim 5, characterized in that: Vertically, the third smoke-blocking part (3.36) is configured to be higher than the two insertion holes (3.32); and the lower end surface of the third smoke-blocking part (3.36) is an arc surface convex downward.

8. The combustion heat exchange system according to claim 5, wherein: The second smoke-blocking part (3.35) includes: a first guide plate (3.351) extending obliquely, which is configured to guide the smoke flowing from bottom to top to the upper end of one of the insertion holes (3.32); a second guide plate (3.352) extending obliquely, which 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).

9. The combustion heat exchange system according to claim 1, wherein: On the side wall of the smoke guide channel (2.1), there is provided a diversion part (2.6) protruding into the smoke guide channel (2.1); The inside of the diversion part (2.6) is provided as a cavity and is communicated with the heat-resistant cavity (2.2); and, the outer wall of the diversion part (2.6) includes: a diversion wall (2.61) facing the combustion port (1.11), which is obliquely arranged to guide the air flow flowing upward from the side wall of the smoke guide channel (2.1) to the center of the smoke guide channel (2.1); a backflow wall (2.63) facing away from the combustion port (1.11); and a connecting wall (2.62) extending vertically and connecting the diversion wall (2.61) and the backflow wall (2.63); The air outlet channel (2.4) is arranged on the backflow wall (2.63).

10. The combustion heat exchange system according to claim 1, characterized in that: On the side wall of the smoke guide channel (2.1), there is provided a diversion part (2.6) protruding into the smoke guide channel (2.1); The inside of the diversion part (2.6) is provided as a cavity and is communicated with the heat-resistant cavity (2.2); and, the outer wall of the diversion part (2.6) includes: a diversion wall (2.61) facing the combustion port (1.11), which is obliquely arranged to guide the air flow at the side wall of the smoke guide channel (2.1) to the center of the smoke guide channel (2.1); a backflow wall (2.63) facing away from the combustion port (1.11); and a connecting wall (2.62) extending vertically and connecting the diversion wall (2.61) and the backflow wall (2.63); The air outlet channel (2.4) is arranged on the connecting wall (2.62).

11. The combustion heat exchange system according to claim 10, wherein: The side wall of the smoke guide channel (2.1) is bent to form a step flow part (2.11) extending horizontally and located below the diversion part (2.6); In the step flow part (2.11), there is a supplementary air channel (2.12) for the air in the external space of the smoke guide housing (2) to enter the smoke guide channel (2.1).

12. Gas water heater, characterized in that: Comprising the combustion heat exchange system according to any one of claims 1 to 11.

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