Combustion assembly and gas water heater

Abstract

The invention relates to the technical field of household appliance equipment, in particular to a combustion assembly and a gas water heater, the combustion assembly comprises a combustor used for forming flames, and the combustor is provided with a combustion port allowing the flames to be sprayed outwards; the smoke guide shell is detachably and fixedly connected to the combustor, a smoke guide channel is arranged in the smoke guide shell, the smoke guide channel is communicated with the combustion port and exhausts smoke generated by combustion upwards, and an opening in the lower end of the smoke guide channel is connected with the combustion port, so that a combustion area for flame combustion is formed in the smoke guide channel; a heat resistance structure is formed in the side wall of the smoke guide channel, and comprises a heat resistance cavity formed in the side wall of the smoke guide channel; the air outlet hole channel is used for communicating the heat resistance cavity with the smoke guide channel; and the air inlet hole channel is communicated with the upper end area of the heat resisting cavity and is used for communicating the heat resisting cavity with external air. According to the combustion assembly, heat can be prevented from being dissipated outwards through a simple structure, so that the combustion assembly is higher in economical efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of household electrical appliances, and more specifically to a combustion assembly and a gas water heater. Background Art

[0002] A gas water heater is a household device that releases heat energy by burning gas and uses a heat exchange device to conduct heat to water flow to achieve rapid heating. A typical gas water heater includes four core modules: a combustion assembly (generating high-temperature flames), a heat exchanger (heat exchange tubes for gas-water heat conduction), a fan system (including components such as a turbine fan), and supporting pipelines and electrical control components.

[0003] In existing technical solutions, to reduce the impact of high-temperature flames generated during the operation of the combustion assembly on surrounding electrical components, two heat dissipation methods are generally adopted: one is to set up a circulating water cooling device on the outer wall of the combustion chamber, and the other is to install an active air cooling system on the periphery. However, it is found in actual applications that:

[0004] For the water-cooled heat dissipation solution, its water pipeline needs to be arranged in a multi-dimensional and three-dimensional manner with the combustion chamber, resulting in complex structure and cumbersome installation procedures; to prevent coolant leakage and oxidation and corrosion of metal pipelines, high-seal-grade pipes and surface treatment processes must be used, significantly increasing the manufacturing cost; there is a risk of scaling during long-term operation, affecting the heat dissipation efficiency and having high maintenance costs.

[0005] For the active air cooling system, since an independent fan component needs to be configured, it not only generates additional equipment procurement costs, but also requires a dedicated air duct and an independent control circuit, resulting in an increase in the overall assembly complexity of the machine.

[0006] That is, both of the above two traditional heat dissipation methods have technical bottlenecks such as complex structure, high production cost, and poor economy. Summary of the Invention

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

[0008] Another object of the invention is to provide a gas water heater having the above combustion assembly.

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

[0010] A combustion assembly, comprising:

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

[0012] A smoke guide housing detachably fixed to a burner, which has inside: a smoke guide passage communicating with a combustion port and discharging the smoke generated by combustion upward, and a lower end opening of the smoke guide passage connecting to the combustion port so that a combustion area for flame combustion is formed in the smoke guide passage;

[0013] A heat insulation structure is formed in the side wall of the smoke guide passage, and the heat insulation structure includes:

[0014] A heat insulation cavity provided in the side wall of the smoke guide passage;

[0015] An air outlet passage for communicating the heat insulation cavity with the smoke guide passage;

[0016] An air inlet passage communicating with the upper end region of the heat insulation cavity and for communicating the heat insulation cavity with external air.

[0017] In some solutions, the air outlet passage communicates with the lower end region of the heat insulation cavity.

[0018] In some solutions, one end of the air outlet passage away from the heat insulation cavity is arranged opposite to the combustion area so that the air flow output from the air outlet passage can be transported to the combustion area of the smoke guide passage.

[0019] In some solutions, the air inlet passage is arranged on a side wall of the heat insulation cavity facing away from the smoke guide passage, and this side wall is provided with: a drainage part protruding into the heat insulation cavity and guiding the air flow entering the heat insulation cavity from the air inlet passage to flow upward.

[0020] In some solutions, the heat insulation cavity has a side wall between the smoke guide passage and the heat insulation cavity, and this side wall has: a plurality of heat guiding parts protruding into the heat insulation cavity.

[0021] In some solutions, a plurality of heat insulation structures are arranged around the smoke guide passage, and the heat insulation cavities in each heat insulation structure communicate with each other to form an annular cavity surrounding the outer periphery of the smoke guide passage.

[0022] In some solutions, the side wall of the smoke guide passage is provided with: a diversion part protruding into the smoke guide passage;

[0023] The inside of the diversion part is arranged as a cavity and communicates with the heat insulation cavity;

[0024] And, the outer wall of the diversion part includes:

[0025] A drainage wall facing the combustion port, which is inclined to guide the air flow at the side wall of the smoke guide passage to the center of the smoke guide passage;

[0026] A backflow wall facing away from the combustion port;

[0027] And a connecting wall extending vertically and connecting the drainage wall and the backflow wall;

[0028] The air outlet channel is arranged on the backflow wall.

[0029] In some solutions, a flow guiding part protruding into the smoke guiding channel is arranged on the side wall of the smoke guiding channel;

[0030] The inside of the flow guiding part is arranged as a cavity and is communicated with the heat insulation cavity;

[0031] Moreover, the outer wall of the flow guiding part includes:

[0032] A drainage wall facing the combustion port, which is inclined so as to guide the air flow flowing upward from the side wall of the smoke guiding channel to the center of the smoke guiding channel;

[0033] A backflow wall facing away from the combustion port;

[0034] And a connecting wall extending vertically and connecting the drainage wall and the backflow wall;

[0035] The air outlet channel is arranged on the connecting wall.

[0036] In some solutions, the burner has a flange part located on the outer periphery of the combustion port, and the lower end of the side wall of the smoke guiding channel abuts against the flange part, so that the flange part has: a shielding part for shielding the edge of the lower end opening of the smoke guiding channel;

[0037] The shielding part is provided with: a supplementary air hole channel for external air to enter the smoke guiding channel;

[0038] The supplementary air hole channel extends vertically, so that: the external air flow flows upward into the smoke guiding channel through the supplementary air hole channel.

[0039] The gas water heater includes the combustion assembly described in any of the above solutions.

[0040] The main beneficial effects of the above technical solutions are as follows:

[0041] 1. By arranging a heat insulation structure capable of using cold air as a heat insulation medium in the side wall of the smoke guiding channel in the smoke guiding housing, the heat formed by the flame combustion in the smoke guiding housing can be blocked from overflowing outward, and the surface temperature of the combustion assembly can be effectively controlled.

[0042] 2. The overall heat insulation structure is simpler, and the production cost can be better reduced.

[0043] 3. In addition to being able to form air-cooled heat insulation, the heat insulation air flow can also bring the dissipated heat back into the smoke guiding channel to exchange heat with the heat exchanger, improving the overall effective heat output rate of the combustion assembly to form a high-efficiency gas combustion structure.

[0044] 4. By forming a heat insulation structure, when the combustion component is working, more and more stable oxygen in the external space can be input into the smoke guide channel, so as to better form a uniform oxygen and stable combustion chamber in the smoke guide housing.

[0045] 5. Connect the air outlet channel to the lower end area of the heat insulation cavity, so as to achieve that the air flow can flow into the heat insulation cavity from the upper end area of the heat insulation cavity and flow out from the lower end area of the heat insulation cavity. In this way, a larger area of air flow can be formed in the heat insulation cavity, and then a larger heat blocking area can be formed to improve the blocking effect of the overflowing heat.

[0046] 6. By setting the diversion part, on the one hand, the air flow (such as air, gas and high-temperature flue gas, etc.) 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 the heat can be better concentrated and output, which is convenient for subsequent better utilization of the heat; on the other hand, the air flow can be synchronously driven away from the side wall of the smoke guide channel to further weaken the effect of heat transfer to the outside.

[0047] 7. Further set 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 improve the blocking effect of the overflowing heat as a whole and better reduce the surface temperature of the smoke guide housing.

[0048] 8. By setting the air supplement channel, on the one hand, the air intake can be further increased to enable the gas to burn more fully; on the other hand, combined with the above-mentioned setting of the diversion part, under the same other settings, increasing the air supplement channel can increase the overall air intake, and then can better improve 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 to the outside.

[0049] Further or more detailed beneficial effects will be described in combination with specific embodiments in the specific implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The following further describes the present invention with reference to the drawings:

[0051] Figure 1 It is a schematic diagram of the internal structure of a gas water heater.

[0052] Figure 2 It is a schematic diagram of the installation structure of the combustion component.

[0053] Figure 3 It is a schematic cross-sectional view of the combustion component.

[0054] Figure 4 It is a schematic diagram of the structure of the heat exchanger.

[0055] Figure 5 It is an enlarged schematic diagram of the air outlet channel and the air inlet channel.

[0056] Figure 6 It is a schematic diagram of the flow of the heat dissipation air flow.

[0057] Figure 7 It is a schematic diagram of an installation structure of the smoke guide housing.

[0058] Figure 8 It is a schematic diagram of the setting of the diversion part.

[0059] Figure 9 It is a schematic diagram of the setting of the air supplement channel.

[0060] Figure 10 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

[0061] The present invention will be specifically illustrated below in conjunction with embodiments:

[0062] Embodiment:

[0063] A gas water heater, as shown in the appendix Figure 1 shown, mainly includes a water heater housing, and a number of functional components disposed inside the water heater housing. The number of functional components mainly includes: a combustion assembly for forming a high-temperature flame, a heat exchanger 3 having a water pipe and for transferring high temperature to the cold water in the water pipe, and a blower assembly 4 for forming a directional air flow.

[0064] 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 can be detachably fixedly connected to the burner 1 by using a detachable connection structure such as a screw, which is convenient for maintaining, cleaning or replacing the smoke guide housing 2 in the later stage.

[0065] Among them, the burner 1 includes a burner housing 1.1, and the upper end of the burner housing 1.1 has a combustion port 1.11 for the flame to spray outwards. Exactly, as shown in the appendix Figure 3 shown as an example, an opening facing upwards is formed at the upper end of the burner housing 1.1, and this opening is the combustion port 1.11; moreover, a number of fire grates 1.2 are installed in 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 ignition device in gas water heaters and gas stoves, such as an electric spark ignition device, etc.).

[0066] A gas passage for the inflow of gas is formed inside the burner panel 1.2. The lower end of the gas passage is used to connect to a gas transmission pipeline, and the upper end is communicated with the combustion port 1.11, so that gas can be transported through the burner panel 1.2 to the combustion port 1.11.

[0067] The lower end of the air intake passage 1.12 is open for air to flow in; the upper end is communicated with the combustion port 1.11, so that external air can be transported from the air intake passage 1.12 to the combustion port 1.11.

[0068] The smoke guiding housing 2 is arranged above the burner 1, and inside the smoke guiding housing 2 there is: a smoke guiding passage 2.1 which is communicated with the combustion port 1.11 and discharges the smoke generated by combustion upward. The smoke guiding passage 2.1 can be a vertically penetrating hole formed in the smoke guiding housing 2, and the lower end opening of the hole is communicated with the combustion port 1.11.

[0069] At the same time, in order to better prevent the heat and smoke generated by combustion from overflowing, the lower end opening of the smoke guiding passage 2.1 is arranged in contact with the combustion port 1.11 (that is, the port of the combustion port 1.11 is in contact with or close enough to the port of the lower end opening of the smoke guiding passage 2.1), so that a combustion area for the flame to burn is formed in the smoke guiding passage 2.1. The channel diameter of the smoke guiding passage 2.1 is often greater than or equal to the opening diameter of the combustion port 1.11.

[0070] During operation, gas is transported from the gas passage inside the burner panel 1.2 to the combustion port 1.11, air flows from the air intake passage 1.12 to the combustion port 1.11, and the ignition device 1.3 is controlled to be turned on for ignition, so that the gas at the combustion port 1.11 of the burner 1 can be ignited to form an upward gushing combustion flame. The combustion flame surges into the smoke guiding passage 2.1 for combustion, so that a combustion area for the flame to burn is formed in the smoke guiding passage 2.1. At this time, the smoke and heat generated by combustion enter the smoke guiding passage 2.1 and flow upward under the guiding action of the smoke guiding passage 2.1.

[0071] The heat exchanger 3 is placed above the smoke guiding housing 2 and is used to exchange heat with the high-temperature smoke in the smoke guiding passage 2.1 to form hot water.

[0072] 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 guiding housing 2 by, for example, screws, or connected to other external support structures, such as the water heater housing. The heat exchange housing 3.1 has a heat exchange passage 3.11 with both ends being penetrated (as shown in the appendix Figure 3As shown, the heat exchange channel 3.11 is a vertically penetrating channel; the lower end of the heat exchange channel 3.11 is butt - jointed and communicated with the upper - end opening of the smoke - guiding channel 2.1, so that the high - temperature flue gas generated by combustion in the smoke - guiding channel 2.1 can flow upward into the heat exchange channel 3.11.

[0073] Meanwhile, the heat exchanger 3 further includes a heat - exchange pipeline 3.2. One end of the heat - exchange pipeline 3.2 has a water inlet for water intake, and the other end has a water outlet for water discharge; the heat - exchange pipeline 3.2 is connected to the heat - exchange housing 3.1 and has a 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 part of the heat - exchange pipeline 3.2 placed in the heat exchange channel 3.11. At the same time, cold water is conveyed through, for example, a water pipe into the water inlet of the heat - exchange pipeline 3.2. The cold water is heated after flowing through the part of the heat - exchange pipeline 3.2 placed in the heat exchange channel 3.11 and then hot water is output from the water outlet for use.

[0074] In some cases, 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, aluminum strips, etc.) can be arranged in the heat exchange channel 3.11. The heat - exchange fins 3.3 have parts that fit with the heat - exchange pipeline 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 pipeline 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 pipeline 3.2.

[0075] 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 - guiding channel 2.1 into the heat exchange channel 3.11.

[0076] 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 - guiding channel 2.1. To drive the flue gas to flow from the smoke - guiding channel 2.1 into the heat exchange channel 3.11. At this time, the fan assembly 4 is also provided with an exhaust pipeline for discharging the sucked flue gas in a directional manner, and the exhaust pipeline is used to communicate with the exhaust opening in the building to discharge the flue gas in a directional manner.

[0077] The fan assembly 4 can also be connected to the burner 1, placed at the lower - end opening of the air intake channel 1.12, and is configured to: blow the flue gas in the smoke - guiding channel 2.1 upward. To drive the flue gas to flow from the smoke - guiding 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 exhaust opening in the building.

[0078] In summary, the combustion assembly, 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 further includes a number of electrical components disposed outside the combustion assembly. When the combustion assembly burns 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 assembly, and in severe cases, greatly reduce the service life of the gas water heater.

[0079] Based on this, a combustion assembly that can block the overflow of heat in the smoke guide housing 2 and can better reduce the surface temperature of the smoke guide housing 2 is needed. And a gas water heater equipped with this combustion assembly is proposed.

[0080] As a form, a water-cooling structure can be provided on the outer surface of the smoke guide 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.

[0081] In order to solve the above problems while being able to better simplify the structure and reduce the cost, the present application proposes: a combustion assembly that combines the gas combustion characteristics to block the heat from dissipating outward through a simple structure and has higher economy. And a gas water heater equipped with this combustion assembly is proposed.

[0082] 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 smoke guide channel 2.1.

[0083] 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 5 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 horizontally 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 is a hole provided in the side wall of the heat insulation cavity 2.2 that is horizontally far from the smoke guide channel 2.1 and allows the heat insulation cavity 2.2 to communicate with the outside air, and the air inlet channel 2.3 communicates with the upper end region of the heat insulation cavity 2.2. (In the vertical direction, by dividing the heat insulation cavity 2.2 into three equal parts, the heat insulation cavity 2.2 is sequentially divided from top to bottom into: an upper end region, a middle region, and a lower end region.)

[0084] 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, so as to form a low-pressure zone in the smoke guiding channel 2.1; at this time, external air will enter the heat insulation cavity 2.2 from the air inlet channel 2.3, flow through the heat insulation cavity 2.2 and then flow out from the air outlet channel 2.4 into the smoke guiding channel 2.1, and then a flowing air current (as shown by the arrows in the appendix Figure 6 is 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, and can bring back the heat dissipated from the surface of the smoke guiding shell 2 to the smoke guiding channel 2.1. It can not only block the heat formed by the flame combustion in the smoke guiding shell 2 from overflowing outward, effectively control the surface temperature of the combustion assembly, 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 assembly. At the same time, the above heat insulation structure does not need to additionally set up a complex water pipe structure, has a simpler and easier-to-install structure, and does not need to spend a large cost to deal with the control of the water cooling circuit and the erosion problem of the water circuit, thus better avoiding the problems existing in water cooling.

[0085] Among them, the specific position of the air outlet channel 2.4 can be set according to requirements. In this embodiment, as shown in the appendix Figure 3 and the appendix Figure 5 shown, the air outlet channel 2.4 is preferably communicated with the lower end area of the heat insulation cavity 2.2, so as to achieve: the air current can flow into the heat insulation cavity 2.2 from the upper end area of the heat insulation cavity 2.2 and flow out from the lower end area of the heat insulation cavity 2.2. In this way, a larger area of air current can be formed in the heat insulation cavity 2.2, and then a larger heat blocking area can be formed, improving the blocking effect of the overflowing heat.

[0086] Furthermore, as shown in the appendix Figure 3 and the appendix Figure 5 shown, the end of the air outlet channel 2.4 far away from the heat insulation cavity 2.2 can also be arranged in alignment with the combustion zone, so that the air current output from the air outlet channel 2.4 can be transported to the combustion zone 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 better participate in the combustion of the combustion assembly, improving the overall combustion efficiency and combustion effect of the combustion assembly.

[0087] In the above solution, as shown in the appendix Figure 3 shown, the air inlet channel 2.3 can be arranged on 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 horizontally far away from the smoke guiding channel 2.1), so as to have a more open space for external air to flow into the air inlet channel 2.3, improving the smoothness of air current flow and thus improving the heat blocking effect. At this time, as shown in the appendix Figure 5As shown, on the side wall of the heat insulation cavity 2.2 facing away from the smoke guiding channel 2.1, there may also be provided: a drainage portion 2.5 protruding into the heat insulation cavity 2.2. The drainage portion 2.5 is inclined to guide the air flow entering the heat insulation cavity 2.2 from the air inlet channel 2.3 to flow upward and then downward, so as to further increase the flow area of the air flow in the heat insulation cavity 2.2 and increase the heat blocking area.

[0088] In some solutions, for the side wall of the heat insulation cavity 2.2 located between the smoke guiding channel 2.1 and the heat insulation cavity 2.2, there may be provided: a plurality of heat guiding portions 2.24 protruding into the heat insulation cavity 2.2. In order to increase the contact area between the air flow and the side wall of the smoke guiding channel 2.1, and then improve the heat exchange efficiency between the air flow and the side wall of the smoke guiding channel 2.1, so that the air flow flowing through the heat insulation cavity 2.2 can bring more heat back into the smoke guiding channel 2.1.

[0089] In order to improve the overall heat blocking effect, a plurality of the above-mentioned heat insulation structures may also be provided around the smoke guiding channel 2.1, and the heat insulation cavities 2.2 in each heat insulation structure are interconnected to form an annular cavity surrounding the outer periphery of the smoke guiding channel 2.1, so as to block the heat in the smoke guiding shell 2 from overflowing outward in all directions.

[0090] At this time, as shown in the appendix Figure 7 As shown, the smoke guiding shell 2 mainly includes an inner shell 2a with a smoke guiding channel 2.1 inside, and an outer shell arranged around the inner shell 2a. A heat insulation cavity 2.2 is formed at intervals between the inner shell 2a and the outer shell. The outer shell includes a first outer plate member 2b.1 and a second outer plate member 2b.2. The first outer plate member 2b.1 and the second outer plate member 2b.2 are detachably connected by, for example, screws to form the outer shell. Moreover, the first outer plate member 2b.1 and the second outer plate member 2b.2 are preferably detachably and fixedly connected to the inner shell 2a by, for example, screws. The air outlet channel 2.4 is arranged on the inner shell 2a, and the air inlet channel 2.3 is arranged on the outer shell.

[0091] In any of the above solutions, as shown in the appendix Figure 8 As shown, a flow guiding portion 2.6 protruding into the smoke guiding channel 2.1 may also be provided on the side wall of the smoke guiding channel 2.1.

[0092] Specifically, the inside of the flow guiding part 2.6 is arranged as a cavity and is communicated with the heat insulation cavity 2.2; moreover, the outer wall of the flow guiding part 2.6 (that is, one 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 drainage wall 2.61 facing the combustion port 1.11 (that is, after the airflow is output from the combustion port 1.11, facing the airflow flow), a backflow wall 2.63 facing away from the combustion port 1.11 (that is, after the airflow is output from the combustion port 1.11, facing away from the airflow flow), and a connecting wall 2.62 that extends vertically (vertically or arcuately) and connects the drainage wall 2.61 and the backflow wall 2.63. For example, as shown in Figure 8 As shown, the outer wall of the flow guiding part 2.6 includes: a drainage wall 2.61 facing downward, a backflow wall 2.63 facing upward, and a connecting wall 2.62 that extends arcuately vertically.

[0093] Among them, the drainage wall 2.61 is arranged obliquely so as 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 gathered 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 in the follow-up; 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.

[0094] At this time, as a way, the air outlet channel 2.4 can be arranged on the backflow wall 2.63.

[0095] 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 of the air outlet channel 2.4.

[0096] Regardless of the above-mentioned method, the airflow formed by combustion in the smoke guiding channel 2.1 is not likely to produce an unwanted obstructive effect on the airflow in the heat insulation cavity 2.2, so that the heat insulation airflow for blocking heat can always be smoothly formed in the heat insulation cavity 2.2 as described above.

[0097] Moreover, when the air outlet channel 2.4 is provided on 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 flow of the heat-resistant air flow (the air flow in which external air enters the heat-resistant cavity 2.2 from the air inlet channel 2.3 and then flows out from the air outlet channel 2.4 into the smoke guiding channel 2.1), thereby overall enhancing the blocking effect on the overflowing heat and better reducing the surface temperature of the smoke guiding housing 2.

[0098] Furthermore, as shown in the attached Figure 9 figure, the burner 1 may also have a flange portion 1.13 located on the outer periphery of the combustion port 1.11, and this flange portion 1.13 can be formed by the outward extension of the burner housing 1.1. The channel diameter of the smoke guiding channel 2.1 is configured to be larger than the diameter of the combustion port 1.11, and the smoke guiding housing 2 is placed on the flange portion 1.13 of the burner housing 1.1, and the lower end of the side wall of the smoke guiding channel 2.1 is abutted against the flange portion 1.13, so that the flange portion 1.13 has a shielding portion that shields the edge of the lower end opening of the smoke guiding channel 2.1. The shielding portion is provided with an air supplement channel 1.14 for external air to enter the smoke guiding channel 2.1.

[0099] In this way, by providing the air supplement channel 1.14, on the one hand, it can further increase the intake of air, enabling the gas to burn more fully. On the other hand, combined with the above-mentioned setting of the diversion portion 2.6, with the rest of the settings being the same, adding the air supplement channel 1.14 can increase the overall intake of air, and thus can better increase the gas flow velocity in the smoke guiding channel 2.1 at the connecting wall 2.62, further assisting in 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 overflowing outward.

[0100] In some solutions, the air supplement channel 1.14 can be arranged to extend vertically, so that: the external air flow enters the smoke guiding channel 2.1 upward through the air supplement channel 1.14. And, the upper end opening of the air supplement channel 1.14 is close to the side wall of the smoke guiding channel 2.1 and is preferably placed below the diversion wall 2.61. 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, form an air curtain that flows upward along the surface of the smoke guiding channel 2.1 to block the heat in the smoke guiding channel 2.1 from overflowing outward, further improving the heat blocking effect.

[0101] On the basis of any of the above solutions, especially in the solution with the diversion portion 2.6 provided, as shown in the attached Figure 10As shown, on at least one side wall of the heat insulation cavity 2.2, there may also be provided: a convex portion that is opposite to the central region of the smoke guiding channel 2.1 (the region where the axis of the smoke guiding channel 2.1 is located, which is often also the region where high-temperature flue gas accumulates) in the transverse direction (horizontal direction) and protrudes towards the inside of the heat insulation cavity 2.2. The setting of this convex portion makes: in the vertical direction, the caliber (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 caliber of the heat insulation cavity 2.2 decreases is opposite to the central region of the smoke guiding channel 2.1 in the transverse direction.

[0102] For example, as shown in the appendix Figure 10 On one side wall of the heat insulation cavity 2.2 that is close to the smoke guiding channel 2.1 in the transverse direction, there is provided: a first convex portion 2.21 that is opposite to the central region of the smoke guiding channel 2.1 in the transverse direction and protrudes towards the inside of the heat insulation cavity 2.2; or, on one side wall of the heat insulation cavity 2.2 that is far from the smoke guiding channel 2.1 in the transverse direction, there is provided: a second convex portion 2.22 that is opposite to the central region of the smoke guiding channel 2.1 in the transverse direction and protrudes towards the inside of the heat insulation cavity 2.2.

[0103] By setting the convex portion, when the air flow in the heat insulation cavity 2.2 flows through the narrow opening region that is opposite to the central region of the smoke guiding channel 2.1 in the transverse direction, the flow rate can be increased to a certain extent. It can be achieved that: not only can the contact area between the air flow and the smoke 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 components in the gas water heater, in the case of a certain air flow rate, the region where heat is more likely to overflow can pass through a faster air flow to bring the heat back into the smoke guiding channel 2.1 more quickly; while the region where the heat overflows more slowly passes through a slower and larger air flow rate to stably, slowly and fully transfer heat 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.

[0104] In some solutions, in the direction from top to bottom, the cross-sectional area of the convex portion can gradually increase to better drive the air flow to flow smoothly from top to bottom in the heat insulation cavity 2.2.

[0105] Furthermore, on the side wall of the heat insulation cavity 2.2 that is opposite to the smoke guiding channel 2.1 (i.e., the side wall of the heat insulation cavity 2.2 that is far from the smoke guiding channel 2.1 in the transverse direction), there is a part that is transversely aligned with the convex portion, and this part may also be provided with: a supplementary flow hole 2.23 for external air to flow into the heat insulation cavity 2.2. 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 supplementary flow hole 2.23, 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.

[0106] The above are only the preferred embodiments of the present invention, and do not limit the scope of the present invention. In addition, the terms "vertical", "horizontal", "front", "rear", etc. mentioned in the embodiments of the present invention 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 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 cannot be understood as a limitation to the present invention. It should be further noted that unless otherwise clearly specified and limited, the terms "installation", "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 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.

[0107] 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 purposes of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A combustion assembly, characterized in that: include: A burner (1) for forming a flame, the burner (1) having a combustion port (1.11) for the flame to be ejected outwards; A smoke guide housing (2) detachably fixed to the burner (1), wherein the smoke guide housing (2) has a smoke guide channel (2.1) connected to the combustion port (1.11) and discharging smoke generated by combustion upwards, and the lower end opening of the smoke guide channel (2.1) is connected to the combustion port (1.11), so that a combustion zone for flame combustion is formed in the smoke guide channel (2.1); A heat-resistant structure is formed in the side wall of the smoke-guiding channel (2.1), and the heat-resistant structure comprises: A heat-resistant cavity (2.2) arranged in the side wall of the smoke guiding channel (2.1); An air outlet passage (2.4) for connecting the heat-resisting cavity (2.2) with the smoke-guiding passage (2.1); An air inlet passage (2.3) which is in communication with the upper end region of the heat-resistance cavity (2.2) and allows the heat-resistance cavity (2.2) to communicate with the outside air.

2. The combustion assembly according to claim 1, characterized in that: The air outlet channel (2.4) is in communication with the lower end region of the heat-resistance cavity (2.2).

3. The combustion assembly according to claim 2, characterized in that: One end of the air outlet duct (2.4) away from the heat-resisting cavity (2.2) is arranged in alignment with the combustion zone, so that the airflow output from the air outlet duct (2.4) can be transported to the combustion zone of the smoke guide channel (2.1).

4. The combustion assembly according to claim 1, characterized in that: The air inlet duct (2.3) is arranged on a side wall of the heat-resistant cavity (2.2) facing away from the smoke-guiding channel (2.1), and the side wall is provided with a guide portion (2.5) which protrudes into the heat-resistant cavity (2.2) and guides the airflow entering the heat-resistant cavity (2.2) from the air inlet duct (2.3) to flow upward.

5. The combustion assembly according to claim 1, characterized in that: The heat-resistance cavity (2.2) has a side wall disposed between the smoke-guiding channel (2.1) and the heat-resistance cavity (2.2), and the side wall has a plurality of heat-introducing portions (2.24) protruding into the heat-resistance cavity (2.2).

6. The combustion assembly according to claim 1, characterized in that: A plurality of the heat-resistance structures are arranged around the smoke-guiding channel (2.1), and the heat-resistance cavities (2.2) in the respective heat-resistance structures are interconnected to form an annular cavity surrounding the outer periphery of the smoke-guiding channel (2.1).

7. The combustion assembly according to any one of claims 1 to 6, characterized in that: The side wall of the smoke guiding channel (2.1) is provided with: a flow guiding portion (2.6) protruding into the smoke guiding channel (2.1); The interior of the flow guide (2.6) is arranged as a cavity and is connected to the heat-resistance cavity (2.2); Furthermore, the outer wall of the guide portion (2.6) comprises: A flow guide wall (2.61) facing the combustion port (1.11) is arranged in an inclined manner so as to guide the airflow flowing upward from the side wall of the smoke guide channel (2.1) to the center of the smoke guide channel (2.1); A back flow wall (2.63) facing away from the combustion port (1.11); and a connecting wall (2.62) extending in the vertical direction and connecting the flow guide wall (2.61) and the back flow wall (2.63); The air outlet channel (2.4) is arranged on the back flow wall (2.63).

8. The combustion assembly according to any one of claims 1 to 6, characterized in that: The side wall of the smoke guiding channel (2.1) is provided with: a flow guiding portion (2.6) protruding into the smoke guiding channel (2.1); The interior of the flow guide (2.6) is arranged as a cavity and is connected to the heat-resistance cavity (2.2); Furthermore, the outer wall of the guide portion (2.6) comprises: A flow guide wall (2.61) facing the combustion port (1.11) is arranged at an angle so as to guide the airflow at the side wall of the smoke guide channel (2.1) to the center of the smoke guide channel (2.1); A back flow wall (2.63) facing away from the combustion port (1.11); and a connecting wall (2.62) extending in the vertical direction and connecting the flow guide wall (2.61) and the back flow wall (2.63); The air outlet channel (2.4) is arranged on the connecting wall (2.62).

9. The combustion assembly according to claim 8, characterized in that: The burner (1) has a flange portion (1.13) located at the periphery of the combustion port (1.11), and the lower end of the side wall of the smoke guide channel (2.1) abuts against the flange portion (1.13), so that the flange portion (1.13) has: a shielding portion for shielding the edge of the lower end opening of the smoke guide channel (2.1); The shielding portion is provided with an air supply hole (1.14) for allowing external air to enter the smoke guide channel (2.1).

10. Gas water heater, characterized in that: The invention comprises a combustion assembly as claimed in any one of claims 1 to 9.

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