Combustion heat exchange device and gas water heater with same

Abstract

The invention relates to the technical field of household appliances, in particular to a combustion heat exchange device and a gas water heater with the same, and the combustion heat exchange device comprises a combustor used for forming flames and provided with a combustion port allowing the flames to be sprayed 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 device, heat is prevented from being dissipated outwards through a simple structure, and the combustion heat exchange device 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 device and a gas water heater having the same. Background Art

[0002] A gas heating device (gas water heater) is a civilian heat energy device that converts the chemical energy of gaseous fuel into heat energy and transfers the energy to the circulating water flow through a heat transfer component to achieve rapid heating. Its technical composition mainly includes the following core modules: a combustion heat exchange device (including a combustion device that generates high-temperature flames and a heat exchanger that realizes gas-water heat conduction through finned heat exchange tubes), a fan system (configured with a turbocharged gas drive module), and a supporting fluid transmission loop and electronic control component.

[0003] At present, in the engineering technology field, in response to the temperature rise effect of the high heat radiation of the combustion device on the surrounding circuit modules, two main thermal management strategies are implemented: one is to adopt an external coating of the combustion chamber with a circulating liquid cooling and heat dissipation mechanism, and the other is to add a mechanical air cooling component to the outer frame of the device. However, through engineering practice verification, the following technical bottlenecks exist:

[0004] For the liquid cooling circulation system, its heat dissipation pipeline needs to be three-dimensionally coupled and arranged with the outer wall of the combustion chamber, resulting in a doubling of the difficulty of the device topology structure design and strict assembly process requirements; in order to ensure the airtight performance of the cooling circuit and prevent electrochemical corrosion of the flow channel material, special anti-corrosion alloys must be used and surface passivation treatment must be carried out, significantly increasing the raw material procurement cost; under continuous operating conditions, cooling working medium crystallization deposition may occur, leading to an increase in the thermal resistance coefficient and an increase in the system maintenance frequency.

[0005] For the mechanical air cooling scheme, because an independent turbo air supply module needs to be configured, it not only generates new hardware purchase expenses, but also needs to plan a dedicated air flow channel and a supporting power regulation module, resulting in a simultaneous increase in the internal space utilization rate and wiring complexity of the device.

[0006] It can be seen that 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 device 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 device.

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

[0010] Combustion heat exchange device, comprising:

[0011] A burner for forming a flame, the burner having 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. The heat exchange housing has a heat exchange channel. 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 attached to the heat exchange parts;

[0013] A smoke guide housing, which has inside it: a smoke guide channel connected to the combustion port and discharging the smoke generated by combustion upwards into the heat exchange channel, and 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, and the heat insulation structure includes:

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

[0016] An air outlet channel for connecting the heat insulation cavity to the smoke guide channel;

[0017] An air inlet channel for connecting the heat insulation cavity to the external space of the smoke guide housing;

[0018] At least one side wall of the heat insulation cavity is provided with a diversion part protruding into the heat insulation cavity so that: a narrow area with a reduced diameter is formed in the heat insulation cavity;

[0019] The narrow area is aligned with the central area of the smoke guide channel.

[0020] In some solutions, the air inlet channel is connected to the lower end area of the heat insulation cavity, and the air outlet channel is connected to the upper end area of the heat insulation cavity;

[0021] Or, the air inlet channel is connected to the upper end area of the heat insulation cavity, and the air outlet channel is connected to the lower end area of the heat insulation cavity.

[0022] In some solutions, the side wall of the heat insulation cavity is provided with: a supplementary flow channel for connecting the narrow area of the heat insulation cavity to the external space of the smoke guide housing.

[0023] In some solutions, the heat exchange fins include a fin body, the fin body has at least two insertion pipe holes, and the two insertion pipe holes are arranged at intervals in the transverse direction;

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

[0025] One side surface of the fin body has a protruding smoke blocking structure, and the smoke blocking structure is placed in the middle area between the two insertion pipe holes and drives the smoke flowing from bottom to top to flow towards the insertion pipe 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, which are arranged at intervals from bottom to top;

[0027] 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.

[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 surface of the third smoke blocking part is an arc 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, a diversion part that protrudes into the smoke guiding channel is provided on the side wall of the smoke guiding channel;

[0036] The inside of the diversion part is provided as a cavity and is connected to the heat blocking 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 backflow wall facing away from the combustion port;

[0040] And a connecting wall that extends vertically and connects the drainage wall and the backflow wall;

[0041] The air outlet channel is provided on the backflow wall.

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

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

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

[0045] A diversion 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;

[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 device described in any of the above solutions.

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

[0053] 1. By providing a heat resistance structure located 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 device.

[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 airflow can also bring back the dissipated heat to the smoke guide channel for heat exchange with the heat exchanger, improving the overall effective heat output rate of the combustion device to form a high-efficiency gas combustion structure.

[0056] 4. By forming a heat resistance structure, when the combustion device is operating, more and more stable oxygen in the external space can be input into the smoke guide channel to better form a uniform oxygen and stable combustion chamber in the smoke guide housing.

[0057] 5. By setting the diversion part, when the airflow in the heat resistance cavity flows through the narrow opening area opposite to the central area of the smoke guide channel in the horizontal direction, the flow rate can be increased to a certain extent. It is realized that not only the contact area between the airflow and the smoke guide housing can be increased, but also the heat transferred to the side wall of the smoke guide channel can be better brought back to the smoke guide channel, optimizing the heat insulation effect.

[0058] 6. By setting the fins accordingly to form a smoke resistance structure, the heat exchange efficiency can be better improved.

[0059] 7. By setting the flow guiding part, on the one hand, it can better gather the air flow (such as air, gas, and high-temperature flue gas, etc.) at the center of the smoke guiding channel, so as to improve the combustion efficiency and heat concentration rate, and then can better gather and output heat, which is convenient for better utilization of heat in the follow-up; on the other hand, it can synchronously drive the air flow away from the side wall of the smoke guiding channel, so as to further weaken the effect of heat transfer to the outside.

[0060] 8. By setting the connection of the air inlet channel and the air outlet channel, a large-area air flow can be formed in the heat blocking cavity, and then a larger heat blocking area can be formed to improve the blocking effect of the overflowing heat.

[0061] 9. By setting 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 setting of the above-mentioned flow guiding part, with the same other settings, increasing the air supplement channel can increase the overall air intake, and then can better increase the gas flow rate in the smoke guiding channel at the connection wall, further providing assistance for the formation and smooth flow of the heat blocking air flow, so as to better block the heat in the smoke guiding channel from overflowing to the outside.

[0062] Furthermore, more detailed beneficial effects will be described in combination with specific embodiments in the specific implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] The following further describes the present invention with reference to the drawings:

[0064] Figure 1 It is a schematic diagram of the internal structure of a gas water heater.

[0065] Figure 2 It is a schematic diagram of the installation structure of the combustion device.

[0066] Figure 3 It is a schematic cross-sectional view of the combustion device.

[0067] Figure 4 It is a schematic diagram of the structure of the heat exchanger.

[0068] Figure 5 It is a schematic diagram of the fin structure.

[0069] Figure 6 It is a front view schematic diagram of the fin.

[0070] Figure 7 It is a schematic cross-sectional view of the smoke guiding housing.

[0071] Figure 8 It is an enlarged schematic diagram of the air outlet channel.

[0072] Figure 9 It is an enlarged schematic diagram of the air inlet channel.

[0073] Figure 10 Schematic enlarged view of the air inlet channel when a supplementary air hole is provided.

[0074] Figure 11 Schematic installation structure diagram of the smoke guide housing. Detailed implementation manners

[0075] The present invention will be specifically illustrated below in conjunction with embodiments:

[0076] Embodiment:

[0077] The gas water heater, as shown in the appendix Figure 1 mainly includes a water heater housing, a combustion heat exchange device and a fan assembly 4 disposed inside the water heater housing. The combustion heat exchange device 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 device.

[0078] Specifically, for example, as shown in the appendix Figure 1 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 (for example, detachably fixedly connected to the burner housing 1.1 hereinafter) by a detachable connection method such as screws, which facilitates the maintenance, cleaning or replacement of the smoke guide housing 2 in the later stage.

[0079] 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 an example, as shown in the appendix Figure 3 the upper end of the burner housing 1.1 is formed with an opening facing upwards, and this opening is the combustion port 1.11; moreover, a number of fire grates 1.2 are installed in the burner housing 1.1 in a cavity manner, and an air inlet channel 1.12 for air to flow in is formed; an ignition device 1.3 for ignition is also provided in the combustion port 1.11 (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.).

[0080] A gas channel for gas to flow in is formed in the fire grate 1.2. The lower end of this gas channel is used to connect to a gas delivery 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 fire grate 1.2.

[0081] The lower end of the air inlet channel 1.12 is provided with an open end 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 inlet channel 1.12.

[0082] The smoke guide housing 2 is disposed above the burner 1, and inside the smoke guide housing 2 there is a smoke guide passage 2.1 which is in communication with the combustion port 1.11 and discharges the smoke generated by combustion upward. The smoke guide passage 2.1 can be a vertically penetrating hole formed in the smoke guide housing 2, and the lower end opening of this hole is in communication with the combustion port 1.11.

[0083] Meanwhile, in order to better prevent the heat and smoke generated by combustion from spilling out, 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.

[0084] During operation, the fuel gas is transported from the fuel gas passage inside the burner row 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, then the fuel gas at the combustion port 1.11 of the burner 1 can be ignited to form an upward surging 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.

[0085] 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.

[0086] Specifically, as an example shown in the appendix Figure 4 The heat exchanger 3 includes a heat exchange housing 3.1. The heat exchange housing 3.1 can be detachably connected to the smoke guide 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 with both ends penetrating (as shown in the appendix Figure 3 the heat exchange passage 3.11 is a vertically penetrating hole); the lower end of the heat exchange passage 3.11 is butted and communicated with the upper end opening of the smoke guide passage 2.1, so that the high-temperature smoke generated by combustion in the smoke guide passage 2.1 can flow upward into the heat exchange passage 3.11.

[0087] Meanwhile, the heat exchanger 3 further includes a heat exchange pipe 3.2. One end of the heat exchange pipe 3.2 has a water inlet for water inlet, and the other end 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 part placed in the heat exchange channel 3.11. It is realized that when combustion is carried out as described above to form a flame and high-temperature flue gas, the high-temperature flue gas flows into the heat exchange channel 3.11 to transfer heat to the heat exchange part of the heat exchange pipe 3.2 placed in the heat exchange channel 3.11. At the same time, cold water is conveyed through the water inlet of the heat exchange pipe 3.2, for example, through a water pipe. The cold water is heated after flowing through the part 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.

[0088] A number of heat exchange fins 3.3 (the heat exchange fins 3.3 are sheet-like structures made of materials with good thermal conductivity such as steel strips, stainless steel strips, copper strips, and aluminum strips) can also be arranged in the heat exchange channel 3.11. The heat exchange fins 3.3 have parts that fit with the heat exchange pipe 3.2 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 better and over a larger area, so as to further improve the heat exchange effect on the cold water in the heat exchange pipe 3.2.

[0089] In order to improve the heat exchange effect, especially when, as described below, the high-temperature air flow is concentrated in the central part of the heat exchange channel 3.11 and flows upward by setting the diversion part 2.6, it is adapted to conduct heat exchange with a faster air flow to improve the heat exchange effect and efficiency; as shown in the appendix Figure 5 As shown in the figure, the heat exchange fin 3.3 in this embodiment includes a fin body 3.31, which is provided with insertion holes 3.32 for inserting the heat exchange pipe 3.2. There are at least two insertion holes 3.32 and they are arranged at intervals in the horizontal 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 sequentially passes through a number of insertion holes 3.32. The inserted part of the heat exchange pipe 3.2 fits with the heat exchange fin 3.3, so that the heat obtained by the heat exchange fin 3.3 from the heat transfer with the high-temperature flue gas can be transferred to the heat exchange pipe 3.2 to heat the heat exchange pipe 3.2.

[0090] As shown in the appendix Figure 5 As shown in the figure, one side surface of the fin body 3.31 has a raised smoke-blocking structure, which is placed in the middle area between 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. It is realized that 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 pipe 3.2 is inserted, so that the hot air flow can heat the heat exchange pipe 3.2 better and faster.

[0091] Further, 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, which are arranged at intervals 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 interval dimensions at both ends of the smoke blocking portion in the left - right direction in the appendix Figure 5 In the figure, the interval dimensions at both ends of the smoke blocking portion in the left - right direction) gradually increase. That is, as shown in the appendix Figure 6 shown, 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.

[0092] 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 flue gas flowing from bottom to top impacts the smoke blocking structure, not only will the flow rate be slowed down, but the airflow will also be divided into a stream of air close to the left insertion hole 3.32 and another stream of air close to the right insertion hole 3.32. It is realized that when the heat - exchange pipes 3.2 are inserted into the insertion holes 3.32 of the heat - exchange fins 3.3, the high - temperature flue gas can be better driven to flow towards the heat - exchange pipes 3.2 to improve the heat - exchange effect.

[0093] 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 airflow to flow, avoiding excessive blockage of the airflow, optimizing the smoothness of the airflow while improving the heat - exchange effect.

[0094] Vertically (in the up - down direction in the appendix Figure 5 figure), the first smoke blocking portion 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 appendix Figure 6 described, the first smoke blocking portion 3.34 is lower than the center of its left insertion hole 3.32 and also lower than the center of its right insertion hole 3.32. It is realized that the first smoke blocking portion 3.34 can better drive the airflow flowing from bottom to top to flow towards the insertion holes 3.32 on both sides; and the airflow can have more space to flow smoothly upward.

[0095] Further, vertically (in the appendix Figure 5In the up and down direction, 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 insertion hole 3.32 on its left and also higher than the insertion hole 3.32 on its right. So that the third smoke blocking part 3.36 can form a greater flow blocking effect at a high position, better suspend the airflow in the area where the insertion hole 3.32 is located on the heat exchange fin 3.3, extend the time for the airflow to be in thermal contact with the heat exchange fin 3.3, and improve the heat exchange effect. And the lower end face of the third smoke blocking part 3.36 is an arc surface that bulges downward in the middle; to optimize the smoothness of the airflow and reduce the possibility of vortex formation.

[0096] Furthermore, as shown in the appendix Figure 5 The second smoke blocking part 3.35 includes a first guide plate 3.351 that extends obliquely (for example, in the appendix Figure 5 shown, it extends obliquely with the left side higher than the right side), and it is configured to guide the flue gas flowing from bottom to top to the upper end of one insertion hole 3.32.

[0097] The second smoke blocking part 3.35 further includes a second guide plate 3.352 that extends obliquely (for example, in the appendix Figure 5 shown, it extends obliquely with the right side higher than the left side), and it is configured to guide the flue gas 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.

[0098] In this way, the airflow 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 airflow; especially when the 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 face of the heat exchange pipe 3.2 facing away from the airflow), so as to improve the heat exchange effect.

[0099] Similarly, as shown in the appendix Figure 5 shown, a plurality of flow blocking columns 3.33 can also be convexly provided on one side surface of the fin body 3.31, which are arranged around the upper half of the insertion hole 3.32. 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.

[0100] In order to increase the contact area with the heat exchange pipe 3.2, an extension wall 3.321 that bulges on one side surface of the fin body 3.31 can also extend from the hole wall of the insertion hole 3.32.

[0101] 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 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 extending in the outer peripheral direction of the insertion hole 3.32. In this way, when a plurality of 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.

[0102] The above-mentioned first smoke-blocking part 3.34, second smoke-blocking part 3.35, third smoke-blocking part 3.36 and the 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.

[0103] On the above basis, as shown in the attached Figure 5 figure, the fin body 3.31 can 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 part 3.37 protruding on one side surface of the fin body 3.31 can 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 part 3.37 is preferably formed by flanging the edge of the fin body 3.31.

[0104] The fan assembly 4 is a fan structure used in a gas water heater to form an air flow, and it 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.

[0105] 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.

[0106] The fan assembly 4 can also be connected to the burner 1 and placed at the lower end opening of the air intake channel 1.12, and is configured to: blow the flue gas in the smoke guide channel 2.1 upward. 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 upper end opening of the heat exchange channel 3.11 is used to communicate with the smoke exhaust port in the building.

[0107] In summary, the combustion heat exchange device (including the combustion component and the heat exchanger 3) and the fan component 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 device. When the combustion heat exchange device operates as described above, there will be a problem that the high-temperature heat inside the smoke guide housing 2 is likely to overflow, which will not only cause the surface temperature of the smoke guide housing 2 to be too high, affecting the service life of the smoke guide housing 2, but also have an adverse impact on the electrical components outside the combustion heat exchange device, and in severe cases, greatly reduce the service life of the gas water heater.

[0108] Based on this, a combustion heat exchange device that can block the overflow of heat in the smoke guide housing 2 and better reduce the surface temperature of the smoke guide housing 2 is needed. And a gas water heater equipped with this combustion heat exchange device is proposed.

[0109] As a form, a water-cooling structure can be arranged on the outer surface of the smoke guide 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 a complex pipeline structure and difficult installation of the combustion component; moreover, in order to better prevent water leakage and water body corrosion, the water-cooling pipeline structure often requires a large cost.

[0110] While solving the above problems, in order to better simplify the structure and reduce the cost, the present application proposes: a combustion heat exchange device that combines the combustion characteristics of gas to block the outward dissipation of heat through a simple structure and has higher economy. And a gas water heater equipped with this combustion heat exchange device is proposed.

[0111] As an example, as shown in the attached Figure 3 and the attached Figure 7 The combustion device in this embodiment further includes a heat insulation structure formed in the side wall of the smoke guide channel 2.1.

[0112] Specifically, the heat insulation structure includes a heat insulation cavity 2.2, an air outlet channel 2.4, and an air inlet channel 2.3. To be exact, for example, as shown in the attached Figure 3 and the attached Figure 7 The heat insulation cavity 2.2 is a cavity arranged in the side wall of the smoke guide channel 2.1; the air outlet channel 2.4 is a hole arranged 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 air inlet channel 2.3 can be a hole arranged in the side wall of the heat insulation cavity 2.2 that is laterally far from the smoke guide channel 2.1 or the bottom wall of the heat insulation cavity 2.2 and allows the heat insulation cavity 2.2 to communicate with the external air.

[0113] At this time, when a flame is formed in the combustion zone of the smoke guiding channel 2.1, oxygen and fuel gas are consumed, and high-temperature flue gas that rises directly is formed to create a low-pressure area in the smoke guiding channel 2.1. At this time, external air enters the heat insulation chamber 2.2 through the air inlet channel 2.3, flows through the heat insulation chamber 2.2, and then flows out to the smoke guiding channel 2.1 through the air outlet channel 2.4. As a result, a flowing air current can be formed in the heat insulation chamber 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 guiding housing 2 to the smoke guiding channel 2.1. It can not only block the heat formed by the flame combustion in the smoke guiding housing 2 from overflowing outward, effectively control the surface temperature of the combustion device, but also bring back the dissipated heat to the smoke guiding channel 2.1 for heat exchange with the heat exchanger 3, improving the overall effective heat output rate of the combustion device. 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.

[0114] Based on the above solution, as shown in the appendix Figure 7 On at least one side wall of the heat insulation chamber 2.2, there may also be provided a diversion part that protrudes into the heat insulation chamber 2.2 and is opposite to the central area of the smoke guiding channel 2.1 (the area where the axis of the smoke guiding channel 2.1 is located, which is often also the area where high-temperature flue gas accumulates) in the horizontal direction. This diversion part makes the heat insulation chamber 2.2 have a narrow area with a reduced diameter (for example, in the central area of the heat insulation chamber 2.2). For example, the setting of this diversion part makes the diameter (the diameter or size of the cavity opening) of the heat insulation chamber 2.2 arranged in a large, small, large pattern (that is, arranged to decrease first and then increase) in the vertical direction; and, the part of the heat insulation chamber 2.2 with a reduced diameter (narrow area) is opposite to the central area of the smoke guiding channel 2.1 in the horizontal direction.

[0115] Specifically, for example, as shown in the appendix Figure 7 The diversion part may include a first diversion part 2.21 that is provided on one side wall of the heat insulation chamber 2.2 close to the smoke guiding channel 2.1 in the horizontal direction and protrudes into the heat insulation chamber 2.2. The first diversion part 2.21 is opposite to the central area of the smoke guiding channel 2.1 in the horizontal direction.

[0116] Or, for example, as shown in the appendix Figure 7 The diversion part may also include a second diversion part 2.22 that is provided on one side wall of the heat insulation chamber 2.2 far from the smoke guiding channel 2.1 in the horizontal direction and protrudes into the heat insulation chamber 2.2. The second diversion part 2.22 is opposite to the central area of the smoke guiding channel 2.1 in the horizontal direction.

[0117] By setting the flow diversion part so that: when the airflow in the heat insulation cavity 2.2 flows through the narrow opening area that is transversely opposite to the central area of the smoke guiding channel 2.1, the flow rate can be increased to a certain extent. It is achieved that: not only can the contact area between the airflow and the smoke guiding housing 2 be increased, and the heat transferred to the side wall of the smoke guiding channel 2.1 can be better brought back into the smoke guiding channel 2.1 to optimize the heat insulation effect; but also according to the working characteristics of the combustion device in the gas water heater, in the case of a certain airflow flow rate, the area where heat is more likely to overflow can pass through a faster airflow to bring the heat back into the smoke guiding channel 2.1 more quickly; while the area where the heat overflows more slowly passes through a slower and larger airflow to stably, slowly and fully transfer heat with the side wall of the smoke guiding channel 2.1 and bring the heat back into the smoke guiding channel 2.1, thereby improving the overall heat insulation effect.

[0118] Among them, the specific positions of the air inlet channel 2.3 and the air outlet channel 2.4 can be set according to requirements.

[0119] In this embodiment, as a form: the air inlet channel 2.3 is communicated with the lower end area of the heat insulation cavity 2.2, and the air outlet channel 2.4 is communicated with the upper end area 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 divided into: the upper end area, the middle area and the lower end area from top to bottom.)

[0120] Or, as another form: the air inlet channel 2.3 is communicated with the upper end area of the heat insulation cavity 2.2, and the air outlet channel 2.4 is communicated with the lower end area 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 divided into: the upper end area, the middle area and the lower end area from top to bottom.)

[0121] Regardless of which of the above forms, a large-area airflow can be formed in the heat insulation cavity 2.2, thereby forming a larger heat blocking area and improving the blocking effect on the overflowing heat.

[0122] Moreover, based on any one of the above settings of the air inlet channel 2.3 and the air outlet channel 2.4, as shown in the appendix Figure 7 shown, the side wall of the heat insulation cavity 2.2 facing away from the smoke guiding channel 2.1 (that is: the side wall of the heat insulation cavity 2.2 that is transversely far from the smoke guiding channel 2.1) has a part that is transversely opposite to the flow diversion part, and a supplementary flow channel 2.23 for the air in the external space of the smoke guiding housing 2 to flow into the narrow opening area of the heat insulation cavity 2.2 can be provided on this part. When the heat insulation airflow is formed as described above, the external airflow can flow into the heat insulation cavity 2.2 more quickly through the supplementary flow channel 2.23, increasing the flow rate of the overall heat insulation airflow, further optimizing and improving the blocking effect on the overflowing heat, and better reducing the surface temperature of the smoke guiding housing 2.

[0123] It should be further noted that when the intake duct 2.3 communicates with the lower end area of the heat insulation chamber 2.2 and the outlet duct 2.4 communicates with the upper end area of the heat insulation chamber 2.2. As shown in the attached Figure 7 and the attached Figure 9 figure, the intake duct 2.3 can be arranged in the bottom wall of the heat insulation chamber 2.2 (i.e., the cavity wall at the bottom of the heat insulation chamber 2.2) and is configured to extend vertically. That is, the intake duct 2.3 is a vertically penetrating duct arranged in the bottom wall of the heat insulation chamber 2.2. The upper end of the duct communicates with 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 intake duct 2.3 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 heat insulation chamber 2.2 and then flow smoothly upward to the outlet duct 2.4, so as to better and more stably form a continuously flowing heat insulation air flow and optimize the blocking effect of the overflow heat.

[0124] In any of the above solutions, as shown in the attached Figure 8 figure, 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.

[0125] Specifically, the interior of the flow guiding portion 2.6 is provided with a cavity and communicates with the heat insulation chamber 2.2; moreover, the outer wall of the flow guiding portion 2.6 (i.e., the side wall on the protruding outer surface of the flow guiding portion 2.6 for contacting the air flow in the smoke guide channel 2.1) includes a flow guiding wall 2.61 facing the combustion port 1.11 (i.e., facing the air flow after the air flow is output from the combustion port 1.11), a back flow wall 2.63 facing away from the combustion port 1.11 (i.e., facing away from the air flow after the air flow is output from the combustion port 1.11), and a connecting wall 2.62 extending vertically (vertically or arcuately) and connecting the flow guiding wall 2.61 and the back flow wall 2.63. That is, the upper end of the connecting wall 2.62 is connected to the back flow wall 2.63, and the lower end is connected to the flow guiding wall 2.61 to connect the flow guiding wall 2.61 and the back flow wall 2.63. For example, as shown in the attached Figure 8 figure, the outer wall of the flow guiding portion 2.6 includes a downward-facing flow guiding wall 2.61, an upward-facing back flow wall 2.63, and a connecting wall 2.62 extending arcuately vertically.

[0126] Among them, the diversion wall 2.61 is inclined 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 (the area where the axis of the smoke guide channel 2.1 is located). In this way, on the one hand, the air flow (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 air flow away from the side wall of the smoke guide channel 2.1 to further weaken the effect of heat transfer outward.

[0127] At this time, for the air outlet channel 2.4:

[0128] The air outlet channel 2.4 can be arranged on the backflow wall 2.63; or, the air outlet channel 2.4 is arranged on the connecting wall 2.62.

[0129] When the air outlet channel 2.4 is arranged on the connecting wall 2.62, the air outlet channel 2.4 is preferably inclined and extended so that after the air flow 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 air flow 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 air flow 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 air flow, and then improve the stability of the heat output of the combustion device while optimizing the blocking effect of the overflow heat.

[0130] Whether the air outlet channel 2.4 is arranged on the backflow wall 2.63 or the connecting wall 2.62, the air flow formed by combustion in the smoke guide channel 2.1 is not likely to have an unnecessary obstructive effect on the air flow in the heat insulation cavity 2.2, so that the heat insulation air flow for blocking heat as described above can always be smoothly formed in the heat insulation cavity 2.2.

[0131] 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 air flow, it will drive the diameter of the smoke guide channel 2.1 at the connecting wall 2.62 to decrease, and the flow velocity increases and the fluid pressure decreases in this area; furthermore, it can better attract the air flow in the heat insulation cavity 2.2, and further improve the smoothness of the formation and circulation of the heat insulation air flow (the air flow of external air entering the heat insulation cavity 2.2 from the 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 overall improve the blocking effect of the overflow heat and better reduce the surface temperature of the smoke guide housing 2.

[0132] Furthermore, when the diversion part 2.6 is provided, as shown in the appendix Figure 10As shown, the side wall portion of the smoke guiding channel 2.1 can also be formed in a bent shape with a step 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 step flow portion 2.11. The supplementary air hole channel 2.12 is a channel provided in the step flow portion 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.

[0133] In this way, by providing the supplementary air hole channel 2.12, 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 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 air intake, and further improve the gas flow rate in the smoke guiding channel 2.1 at the connecting wall 2.62, further facilitating the formation and smooth flow of the heat-resistant air flow, so as to better block the heat in the smoke guiding channel 2.1 from spilling outwards.

[0134] The supplementary air hole channel 2.12 in this embodiment is configured to extend vertically so that the air in the external space can flow upwards into the smoke guiding channel 2.1 from the supplementary air hole channel 2.12 in a manner adapted 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 upwards close to the side wall of the smoke guiding channel 2.1, better blocking the heat in the smoke guiding channel 2.1 from spilling outwards and further improving the heat blocking effect.

[0135] In order to improve the overall heat blocking effect, a plurality of the above-mentioned heat-resistant structures can also be provided around the smoke guiding channel 2.1, and the heat-resistant cavities 2.2 in each heat-resistant structure are interconnected to form an annular cavity around the outer periphery of the smoke guiding channel 2.1, blocking the heat in the smoke guiding housing 2 from spilling outwards by 360 degrees.

[0136] At this time, as shown in the appendix Figure 11 The smoke guiding housing 2 mainly includes an inner layer housing 2a with a smoke guiding channel 2.1 inside, and an outer layer housing disposed around the inner layer housing 2a. A heat-resistant cavity 2.2 is formed at an interval between the inner layer housing 2a and the outer layer housing. The outer layer housing includes a first outer layer plate member 2b.1 and a second outer layer plate member 2b.2. The first outer layer plate member 2b.1 and the second outer layer plate member 2b.2 are detachably connected by, for example, screws to form the outer layer housing. Moreover, both the first outer layer plate member 2b.1 and the second outer layer plate member 2b.2 are preferably detachably fixedly connected to the inner layer housing 2a by, for example, screws.

[0137] 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. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product is customarily placed during use. These are 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. Therefore, it should not be construed as a limitation of the present invention. It should be further noted that unless otherwise clearly specified and limited, terms such as "installation", "connection", "attachment", "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 a communication inside 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.

[0138] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. Combustion heat exchange device, characterized in that, Comprising: A burner (1) for forming a flame, the burner (1) having a combustion port (1.11) for the flame to spray outwards; A heat exchanger (3) placed above the burner (1), which includes a heat exchange housing (3.1), heat exchange pipes (3.2) and heat exchange fins (3.3). There is a heat exchange channel (3.11) in the heat exchange housing (3.1). The heat exchange part of the heat exchange pipes (3.2) is placed in the heat exchange channel (3.11), and the heat exchange fins (3.3) are placed in the heat exchange channel (3.11) and are attached to this heat exchange part; A smoke guiding housing (2), which has inside it: a smoke guiding channel (2.1) connected to the combustion port (1.11) and discharging the smoke generated by combustion upwards 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 this 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 connecting the heat insulation cavity (2.2) to the smoke guiding channel (2.1); An air inlet channel (2.3) for connecting the heat insulation cavity (2.2) to the external space of the smoke guiding housing (2); At least one side wall of the heat insulation cavity (2.2) is provided with a flow dividing part protruding into the heat insulation cavity (2.2), so that: a narrow area with a reduced diameter is formed in the heat insulation cavity (2.2); The narrow area is opposite to the central area of the smoke guiding channel (2.1).

2. The combustion heat exchange device according to claim 1, wherein: The air inlet channel (2.3) is connected to the lower end area of the heat insulation cavity (2.2), and the air outlet channel (2.4) is connected to the upper end area of the heat insulation cavity (2.2); Or, the air inlet channel (2.3) is connected to the upper end area of the heat insulation cavity (2.2), and the air outlet channel (2.4) is connected to the lower end area of the heat insulation cavity (2.2).

3. The combustion heat exchange device according to claim 2, wherein: The side wall of the heat insulation cavity (2.2) is provided with: a supplementary flow channel (2.23) for connecting the narrow area of the heat insulation cavity (2.2) to the external space of the smoke guiding housing (2).

4. The combustion heat exchange device according to claim 1, wherein: 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 arranged at intervals in the horizontal direction; 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 this smoke blocking structure 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 two insertion holes (3.32) on its two sides.

5. The combustion heat exchange device according to claim 4, characterized in that: 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; In the up - to - down direction, 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) gradually increase.

6. The combustion heat exchange device 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 device 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 face of the third smoke - blocking part (3.36) is an arc - shaped surface that bulges downward.

8. The combustion heat exchange device according to claim 5, characterized in that: The second smoke - blocking part (3.35) includes: A first guide plate (3.351) that extends obliquely and is configured to divert 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) that extends obliquely and is configured to divert 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 device according to any one of claims 1 to 8, characterized in that: On the side wall of the smoke - guiding channel (2.1), there is a diversion part (2.6) that protrudes into the smoke - guiding channel (2.1); The inside of the diversion part (2.6) is provided as a cavity and is in communication with the heat - resistant cavity (2.2); And the outer wall of the diversion part (2.6) includes: A drainage 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 - guiding channel (2.1) to the center of the smoke - guiding channel (2.1); A back - flow wall (2.63) facing away from the combustion port (1.11); And a connecting wall (2.62) that extends vertically and connects the drainage 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).

10. The combustion heat exchange device according to any one of claims 1 to 8, characterized in that: On the side wall of the smoke - guiding channel (2.1), there is a diversion part (2.6) that protrudes into the smoke - guiding channel (2.1); The inside of the diversion part (2.6) is provided as a cavity and is in communication with the heat - resistant cavity (2.2); And the outer wall of the diversion part (2.6) includes: A drainage 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 - guiding channel (2.1) to the center of the smoke - guiding channel (2.1); A back - flow wall (2.63) facing away from the combustion port (1.11); And a connecting wall (2.62) that extends vertically and connects the drainage wall (2.61) and the back - flow wall (2.63); The air outlet channel (2.4) is arranged on the connecting wall (2.62).

11. The combustion heat exchange device according to claim 10, characterized in that: The side wall of the smoke - guiding channel (2.1) is bent to form a step - flow part (2.11) that extends horizontally and is 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 - guiding housing (2) to enter the smoke - guiding channel (2.1).

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

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