Combustion assembly and gas water heater with same

Abstract

The utility model relates to the technical field of household appliances, in particular to a combustion assembly and a gas water heater with the same, the combustion assembly comprises a combustor used for forming flames, and the combustor is provided with a combustion port for spraying the flames outwards; the smoke guide shell is internally provided with a smoke guide channel which is communicated with the combustion port and is used for exhausting smoke generated by combustion upwards; a heat resistance structure is formed in the side wall of the smoke guide channel and comprises a near heat flow cavity and a far heat flow cavity which are formed in the side wall of the smoke guide channel, and the near heat flow cavity is arranged between the far heat flow cavity and the smoke guide channel; the overflowing hole channel is used for communicating the near heat flow cavity with the far heat flow cavity; the near heat flow cavity is communicated with the smoke guide channel through the air outlet duct; and the first air inlet duct is used for communicating the far heat flow cavity with the external space of the smoke guide shell. The combustion assembly can prevent heat from being dissipated outwards through a simple structure, so that the combustion assembly has higher economical efficiency; the utility model further discloses the gas water heater with the combustion assembly.

Description

Technical Field

[0001] This utility model relates to the field of household appliance technology, and more specifically to a combustion component and a gas water heater having the component. Background Technology

[0002] Gas-fired water heaters are residential heating devices that utilize the heat energy released by the combustion of gas and transfer that heat to flowing water through a heat exchanger to achieve instant heating. Their basic structure mainly consists of four functional units: a combustion assembly (used to generate a high-temperature flame from the combustion of gas), a heat exchanger (which transfers heat energy from flue gas to water through metal pipes), a fan system (including aerodynamic devices such as turbine fans), and supporting fluid piping and electrical control units.

[0003] Current technologies primarily employ two heat dissipation solutions to address the thermal impact of high-temperature combustion components on adjacent electronic devices: the first is to integrate a circulating water-cooled structure outside the combustion chamber shell, and the second is to install a forced air-cooling device around the equipment. However, practical engineering applications show that:

[0004] For circulating water cooling solutions, the cooling pipes need to be arranged in a multi-dimensional spatial layout with the combustion chamber, which complicates the system structure design and makes the installation and commissioning process cumbersome. In order to ensure the sealing of the cooling medium and resist the oxidation and corrosion of the pipes, high-grade anti-corrosion materials must be selected and special surface treatment processes must be implemented, which directly increases the material cost of the product. During long-term operation of the equipment, scaling may occur in the cooling channels, which will reduce the heat transfer efficiency and increase maintenance expenses.

[0005] Regarding the forced air cooling system, the need to add a dedicated fan assembly not only incurs additional equipment procurement costs but also requires planning an independent air duct and supporting electrical control circuit, significantly increasing the complexity of the overall internal layout.

[0006] It is evident that the two conventional heat dissipation technologies mentioned above have significant technical shortcomings in terms of system structure complexity, manufacturing cost control, and economic indicators. Utility Model Content

[0007] One of the purposes of this invention is to address the shortcomings of existing technologies by providing a combustion component that combines the characteristics of gas combustion to block heat loss through a simple structure, thus achieving higher economic efficiency.

[0008] The second objective of this utility model is to provide a gas water heater having the aforementioned combustion components.

[0009] The technical solution of this utility model is as follows:

[0010] Combustion components, including:

[0011] A burner used to generate a flame, the burner having a combustion port for the flame to be ejected outward;

[0012] The smoke guide housing has a smoke guide channel that is connected to the combustion port and discharges the smoke generated by combustion upwards, and the lower end of the smoke guide channel is connected to the combustion port so that a combustion zone for flame combustion is formed in the smoke guide channel.

[0013] A heat-insulating structure is formed in the sidewall of the smoke guide channel, the heat-insulating structure including:

[0014] The near-heat flow cavity and the far-heat flow cavity are set in the side wall of the smoke guide channel, with the near-heat flow cavity located between the far-heat flow cavity and the smoke guide channel;

[0015] A flow channel connecting the near-hot flow cavity and the far-hot flow cavity;

[0016] An air outlet channel connecting the near-heat flow chamber to the smoke guide channel;

[0017] The first air inlet channel connects the heat flow cavity to the external space of the smoke guide shell.

[0018] In some designs, at least two first air intake channels are provided, which are distributed vertically at intervals, wherein:

[0019] A first air inlet channel is connected to the upper region of the far-heat flow cavity;

[0020] Another first air inlet is connected to the lower region of the far-heat flow cavity.

[0021] In some designs, at least two vents are provided, which are vertically spaced apart, wherein:

[0022] An air outlet is connected to the upper region of the near-heat flow cavity;

[0023] Another vent is connected to the lower region of the near-heat flow cavity.

[0024] In some designs, the vent is connected to the upper region of the near-heat flow cavity;

[0025] Furthermore, a second air inlet is provided in the bottom wall of the near-heat flow cavity, which connects the lower end region of the near-heat flow cavity with the external space of the smoke guide shell.

[0026] In some designs, the second air intake is configured to extend vertically so that air from the outside space can flow upwards into the near-hot flow chamber in accordance with the upward exhaust of flue gas from the second air intake.

[0027] In some designs, the flow channel is configured such that one end is open to the central region of the near-hot flow cavity, and the other end is open to the central region of the far-hot flow cavity.

[0028] In some designs, the sidewalls of the smoke guide duct are provided with a protruding guide section for the smoke guide duct;

[0029] The flow guide section has a hollow cavity and is connected to the near-hot flow cavity;

[0030] Furthermore, the outer wall of the guide portion includes:

[0031] The guide wall facing the combustion port is inclined so as to guide the airflow that flows upward from the side wall of the smoke guide channel to the center of the smoke guide channel.

[0032] The backflow wall facing away from the combustion port;

[0033] And a connecting wall that extends vertically and connects the flow-inducing wall to the backflow wall;

[0034] The air outlet is located in the back flow wall.

[0035] In some designs, the sidewalls of the smoke guide duct are provided with a protruding guide section for the smoke guide duct;

[0036] The flow guide section has a hollow interior and is connected to the near-hot flow cavity;

[0037] Furthermore, the outer wall of the guide portion includes:

[0038] The guide wall facing the combustion port is inclined so as to guide the airflow at the side wall of the smoke guide channel to the center of the smoke guide channel;

[0039] The backflow wall facing away from the combustion port;

[0040] And a connecting wall that extends vertically and connects the flow-inducing wall to the backflow wall;

[0041] The air vent is located in the connecting wall.

[0042] In some designs, the sidewalls of the smoke guide channel are formed in a bent manner with a stepped flow section that extends laterally and is located below the flow guide section;

[0043] The stepped flow section is equipped with air supply channels, which allow air from the external space of the smoke guide shell to enter the smoke guide channel.

[0044] A gas water heater comprising the combustion component described in any of the above embodiments.

[0045] The main beneficial effects of the above technical solution are as follows:

[0046] 1. By setting a heat-insulating structure in the smoke guide housing located in the side wall of the smoke guide channel, which can use cold air as a heat insulation medium, the heat generated by the flame combustion in the smoke guide housing can be prevented from overflowing outward, effectively controlling the surface temperature of the combustion component.

[0047] 2. The overall heat-insulating structure is simpler, which can better reduce production costs.

[0048] 3. The double-layer cavity heat-insulating structure can further improve the blocking effect of heat leakage and effectively control the surface temperature of the combustion component.

[0049] 4. In addition to creating air-cooled insulation, the heat-insulating airflow can also bring the dissipated heat back into the flue gas duct for heat exchange with the heat exchanger, thereby improving the overall effective heat output rate of the combustion components and forming a high-efficiency gas combustion structure.

[0050] 5. By forming a heat-resistant structure, when the combustion components are working, more and more stable oxygen from 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 shell.

[0051] 6. Connecting one air outlet to the upper region of the near-heat flow cavity and the other air outlet to the lower region of the near-heat flow cavity can create a larger area of ​​heat-resistant airflow in the near-heat flow cavity, thereby improving the heat blocking effect.

[0052] 7. Based on the above-mentioned air outlet channel configuration, one end of the flow channel is connected to the central region of the near-heat flow cavity, and the other end is connected to the central region of the far-heat flow cavity. While forming a large-area airflow for heat insulation, both airflow paths are relatively short, allowing each airflow to better and faster carry the heat dissipated to the near-heat flow cavity back to the smoke guide channel, reducing the likelihood of uneven heat blockage and further improving the overall heat blocking effect.

[0053] 8. Connect the air outlet to the upper region of the near-heat flow cavity, and also provide a second air inlet in the bottom wall of the near-heat flow cavity, so as to form a larger area of ​​heat-resistant airflow in the near-heat flow cavity and improve the heat blocking effect.

[0054] 9. By setting up air supply channels, the amount of air entering can be further increased, so that the gas can be burned more completely. On the other hand, combined with the above-mentioned flow guide, under the condition that the rest of the settings are the same, adding air supply channels can increase the overall air intake, thereby better improving the gas flow rate in the smoke guide channel at the connecting wall, further contributing to the formation and smooth flow of heat-resistant airflow, so as to better prevent the heat in the smoke guide channel from overflowing outward.

[0055] Further or more detailed beneficial effects will be described in conjunction with specific embodiments in the detailed implementation. Attached Figure Description

[0056] The present invention will be further described below with reference to the accompanying drawings:

[0057] Figure 1 This is a schematic diagram of the internal structure of a gas water heater.

[0058] Figure 2 A schematic diagram of the combustion assembly installation structure.

[0059] Figure 3 This is a cross-sectional schematic diagram of the combustion assembly.

[0060] Figure 4 This is a schematic diagram of a heat exchanger.

[0061] Figure 5 This is a cross-sectional view of the smoke guide shell.

[0062] Figure 6 This is a schematic diagram of the assembly structure of the smoke guide shell.

[0063] Figure 7 This is a cross-sectional view of the smoke guide shell when it has two air outlets.

[0064] Figure 8 A schematic diagram of the structure of the air outlet channel set on the guide section.

[0065] Figure 9 This is a schematic diagram of the smoke guide shell when a second air inlet is provided.

[0066] Figure 10 A schematic diagram showing the setup of the air supply channel. Detailed Implementation

[0067] The present invention will be illustrated with specific examples below:

[0068] Example:

[0069] Gas water heater, as attached Figure 1 As shown, it mainly includes a water heater shell and several functional components placed inside the water heater shell. The several functional components mainly include: a combustion assembly for forming a high-temperature flame, a heat exchanger 3 with water pipes for transferring high temperature to cold water in the water pipes, and a fan assembly 4 for forming a directional airflow.

[0070] Specifically, for example, attached Figure 1 As shown, as an example, the combustion assembly includes a burner 1 and a flue gas housing 2. The flue gas housing 2 can be detachably (using a detachable connection method such as screws) or non-detachably (using a non-detachable connection method such as welding or integral molding) fixedly connected to the burner 1, or it can be not connected to the burner 1, but connected to other external support structures, such as the water heater casing.

[0071] The burner 1 includes a burner housing 1.1, the upper end of which has a combustion port 1.11 for the flame to be ejected outwards. More specifically, as shown in the attached... Figure 3 As an example, the burner housing 1.1 has an upward-facing opening at its upper end, which is a combustion port 1.11; and several burners 1.2 are installed in a hollow cavity inside the burner housing 1.1, and an air intake channel 1.12 for air to flow in is formed; an ignition device 1.3 for ignition is also provided in the combustion port 1.11 (the ignition device 1.3 is a conventional ignition device used in gas water heaters and gas stoves, such as an electric spark ignition device).

[0072] A gas passage for gas to flow into is formed inside the burner 1.2. The lower end of the gas passage is connected to the gas delivery pipeline, and the upper end is connected to the combustion port 1.11 so that the gas can be delivered to the combustion port 1.11 through the burner 1.2.

[0073] The lower end of the air intake passage 1.12 is open to allow air to flow in; the upper end is connected to the combustion port 1.11 so that external air can be delivered from the air intake passage 1.12 to the combustion port 1.11.

[0074] The smoke guide housing 2 is disposed above the burner 1, and the smoke guide housing 2 has a smoke guide channel 2.1 that communicates with the combustion port 1.11 and discharges the flue gas generated by combustion upward. The smoke guide channel 2.1 can be a vertically penetrating channel disposed in the smoke guide housing 2, and the lower end of the channel is connected to the combustion port 1.11.

[0075] Meanwhile, to better prevent the heat and smoke generated during combustion from escaping, the lower opening of the smoke guide channel 2.1 is connected to the combustion port 1.11 (i.e., the port of the combustion port 1.11 is close to or sufficiently close to the port of the lower opening of the smoke guide channel 2.1), so that a combustion zone for flame combustion is formed in the smoke guide channel 2.1. The diameter of the smoke guide channel 2.1 is often greater than or equal to the opening diameter of the combustion port 1.11.

[0076] During operation, gas is supplied from the gas passage inside the burner 1.2 to the combustion port 1.11, and air flows from the air intake passage 1.12 to the combustion port 1.11. The ignition device 1.3 is then activated for ignition, igniting the gas at the combustion port 1.11 of the burner 1 to form an upward-flowing combustion flame. This flame enters the smoke guide passage 2.1 for combustion, creating a combustion zone within the passage. Simultaneously, the flue gas and heat generated by combustion enter the smoke guide passage 2.1 and flow upwards under its guiding effect.

[0077] The heat exchanger 3 is placed above the flue gas housing 2 and is used to exchange heat with the high-temperature flue gas in the flue gas channel 2.1 to form hot water.

[0078] To be precise, as shown in the appendix Figure 4 As illustrated as an example, the heat exchanger 3 includes a heat exchange housing 3.1, which can be detachably connected to the flue gas housing 2, for example, by screws, or to other external support structures, such as the water heater casing. The heat exchange housing 3.1 has heat exchange channels 3.11 (as shown in the attached diagram) that are through-type at both ends. Figure 3 As shown, the heat exchange channel 3.11 is a vertically through-hole; the lower end of the heat exchange channel 3.11 is connected to the upper opening of the flue gas guide channel 2.1 so that the high-temperature flue gas generated by combustion in the flue gas guide channel 2.1 can flow upward into the heat exchange channel 3.11.

[0079] Meanwhile, the heat exchanger 3 also includes a heat exchange pipe 3.2, which has a water inlet at one end and a water outlet at the other end. The heat exchange pipe 3.2 is connected to the heat exchange shell 3.1 and has a portion placed in the heat exchange channel 3.11. Implementation: When combustion occurs as described above to form a flame and high-temperature flue gas, the high-temperature flue gas flows into the heat exchange channel 3.11 to transfer heat to the portion of the heat exchange pipe 3.2 placed in the heat exchange channel 3.11. Simultaneously, cold water is supplied to the water inlet of the heat exchange pipe 3.2 through, for example, a tap water pipe. This cold water is heated after flowing through the portion of the heat exchange pipe 3.2 placed in the heat exchange channel 3.11, and then hot water is output from the outlet for use.

[0080] In some cases, the heat exchange channel 3.11 may also be provided with several 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). The heat exchange fins 3.3 have a part that fits into the heat exchange pipe 3.2 to increase the heat exchange contact area with the high-temperature flue gas, so as to transfer the heat in the high-temperature flue gas to the heat exchange pipe 3.2 better and over a larger area, thereby further improving the heat exchange effect on the cold water in the heat exchange pipe 3.2.

[0081] The fan assembly 4 is a fan structure used in a gas water heater to form an airflow, and it is configured to form an airflow that drives flue gas from the flue gas channel 2.1 into the heat exchange channel 3.11.

[0082] The fan assembly 4 can be connected to the heat exchange housing 3.1, positioned at the upper opening of the heat exchange channel 3.11, and configured to draw in the flue gas from the smoke guide channel 2.1, driving the flue gas from the smoke guide channel 2.1 into the heat exchange channel 3.11. The fan assembly 4 is also equipped with a smoke exhaust duct for directional discharge of the drawn-in flue gas, which is connected to a smoke exhaust outlet in the building to directionally discharge the flue gas.

[0083] The fan assembly 4 can also be connected to the burner 1, positioned at the lower opening of the air intake passage 1.12, and configured to blow the flue gas in the smoke guide passage 2.1 upwards, thereby driving the flue gas from the smoke guide passage 2.1 into the heat exchange passage 3.11. In this case, the upper opening of the heat exchange passage 3.11 is used to connect with the exhaust port in the building.

[0084] In summary, the combustion assembly, heat exchanger 3, and fan assembly 4 together constitute the main components of a gas water heater. In addition, the gas water heater also includes several electrical components located outside the combustion assembly. When the combustion assembly operates as described above, the high-temperature heat inside the flue gas casing 2 easily escapes, causing the surface temperature of the casing 2 to become excessively high, affecting its service life. This also adversely affects the electrical components outside the combustion assembly, potentially significantly reducing the lifespan of the gas water heater in severe cases.

[0085] Therefore, a combustion component is needed that can prevent heat leakage from the smoke guide housing 2 and better reduce the surface temperature of the smoke guide housing 2. A gas water heater equipped with this combustion component is proposed.

[0086] As one approach, a water-cooling structure can be provided on the outer surface of the smoke guide shell 2 to solve the above problems. However, setting up a water-cooling structure often requires a complex piping structure, resulting in complex piping structures and installation difficulties for the combustion assembly; moreover, in order to better prevent water leakage and water corrosion, the water-cooled piping structure often requires a large cost.

[0087] To address the aforementioned issues while simplifying the structure and reducing costs, this application proposes a combustion component that, by combining the characteristics of gas combustion, can effectively prevent heat loss through a simple structure, thus achieving higher economic efficiency. A gas water heater incorporating this combustion component is also proposed.

[0088] As an example, see attached Figure 3 and attached Figure 5 As shown, the combustion assembly in this embodiment also includes a heat-resistant structure formed in the sidewall of the smoke guide channel 2.1.

[0089] Specifically, the heat-insulating structure includes: a near-heat flow cavity 2.2a and a far-heat flow cavity 2.2b disposed in the side wall of the smoke guide channel 2.1, with the near-heat flow cavity 2.2a located between the far-heat flow cavity 2.2b and the smoke guide channel 2.1; a flow channel 2.211 for connecting the near-heat flow cavity 2.2a and the far-heat flow cavity 2.2b; an air outlet channel 2.4 for connecting the near-heat flow cavity 2.2a and the smoke guide channel 2.1; and a first air inlet channel 2.3 for connecting the far-heat flow cavity 2.2b and the external space of the smoke guide housing 2.

[0090] For example, attached Figure 3 and attached Figure 5 As shown, in this embodiment, a heat-insulating cavity 2.2 with a hollow structure is provided in the side wall of the smoke guiding channel 2.1. For example, see attached... Figure 6 As shown, the smoke guide housing 2 in this embodiment mainly consists of an inner housing 2a with a smoke guide channel 2.1 inside, and an outer plate 2b fixedly connected to the outer periphery of the inner housing 2a by means of, for example, screws. There is a spaced portion between the inner housing 2a and the outer plate 2b, which forms a heat-insulating cavity 2.2.

[0091] The heat-insulating cavity 2.2 is provided with a vertically extending partition plate 2.21, which divides the heat-insulating cavity 2.2 into a near-heat flow cavity 2.2a and a far-heat flow cavity 2.2b, with the near-heat flow cavity 2.2a located between the far-heat flow cavity 2.2b and the smoke guide channel 2.1.

[0092] Meanwhile, the heat-insulating cavity 2.2 has a perforated air outlet 2.4 in the side wall near the smoke guide channel 2.1 in the transverse direction. One end of the air outlet 2.4 is connected to the smoke guide channel 2.1, and the other end is connected to the near-heat flow cavity 2.2a.

[0093] The heat-insulating cavity 2.2 has a first air inlet channel 2.3 with a perforated structure in the side wall away from the smoke guide channel 2.1 in the lateral direction. One end of the first air inlet channel 2.3 is connected to the heat flow cavity 2.2b, and the other end is connected to the external space of the smoke guide shell 2.

[0094] The partition plate 2.21 is provided with a perforated flow channel 2.211, one end of which is open and connected to the near heat flow cavity 2.2a, and the other end is open and connected to the far heat flow cavity 2.2b.

[0095] At this time, when a flame forms in the combustion zone of the smoke guide channel 2.1, it consumes oxygen and fuel gas, and forms high-temperature flue gas that rises directly, creating a low-pressure zone in the smoke guide channel 2.1. At this time, external air enters the far-heat flow chamber 2.2b from the first air inlet 2.3, flows into the near-heat flow chamber 2.2a from the overflow 2.211, and then flows out into the smoke guide channel 2.1 from the exhaust 2.4, thus forming a flowing airflow in the heat-insulating chamber 2.2, called the heat-insulating airflow. This heat-insulating airflow forms a wind-cooled heat insulation, which can bring the heat dissipated from the surface of the smoke guide shell 2 outward into the smoke guide channel 2.1. It can not only prevent the heat generated by the flame combustion in the smoke guide shell 2 from overflowing outward, effectively controlling the surface temperature of the combustion component, but also bring the dissipated heat back into the smoke guide channel 2.1 for heat exchange with the heat exchanger 3, improving the overall effective heat output rate of the combustion component. Meanwhile, the aforementioned heat-insulating structure does not require additional complex water pipe structures, has a simpler and easier-to-install structure, and does not require significant costs to address the control of the water cooling circuit and the erosion of the water circuit, thus better avoiding the problems associated with water cooling.

[0096] In the above scheme, as shown in the appendix Figure 7 and attached Figure 8 As shown, a guide section 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.

[0097] Specifically, the guide section 2.6 has a hollow interior and communicates with the near-hot flow cavity 2.2a; and the outer wall of the guide section 2.6 (i.e., the side wall of the protruding outer surface of the guide section 2.6 for contacting the airflow in the smoke guide channel 2.1) includes: a guide wall 2.61 facing the combustion port 1.11 (i.e., the airflow flowing towards the airflow after being output from the combustion port 1.11), a backflow wall 2.63 facing away from the combustion port 1.11 (i.e., the airflow flowing away from the airflow after being output from the combustion port 1.11), and a connecting wall 2.62 extending vertically (either vertically or in an arc shape) and connecting the guide wall 2.61 and the backflow wall 2.63. That is, the upper end of the connecting wall 2.62 is connected to the backflow wall 2.63, and the lower end is connected to the guide wall 2.61, so as to connect the guide wall 2.61 and the backflow wall 2.63. For example, see attached... Figure 6 As shown, the outer wall of the flow guide 2.6 includes: a flow guide wall 2.61 facing downward, a back flow wall 2.63 facing upward, and a connecting wall 2.62 extending in an arc shape in the vertical direction.

[0098] The guide wall 2.61 is inclined to guide the airflow flowing upward from the side wall of the smoke guide channel 2.1 to the center of the smoke guide channel 2.1 (the area where the axis of the smoke guide channel 2.1 is located). This allows for better concentration of airflow (air, fuel gas, and high-temperature flue gas) at the center of the smoke guide channel 2.1, improving combustion efficiency and heat concentration, thus facilitating better heat accumulation and output for subsequent heat utilization. Simultaneously, it drives the airflow away from the side wall of the smoke guide channel 2.1, further reducing the outward transfer of heat.

[0099] In this case, as a method, the air outlet 2.4 can be set on the back flow wall 2.63.

[0100] Alternatively, as another approach, the exhaust duct 2.4 is disposed on the connecting wall 2.62; and the exhaust duct 2.4 is preferably inclined so that the airflow in the heat-insulating cavity 2.2, after flowing out of the exhaust duct 2.4, can be conveyed obliquely upward. This achieves the following: the airflow flowing from the exhaust duct 2.4 into the smoke guide channel 2.1 can better conform to the flow of rising flue gas in the smoke guide channel 2.1, reducing unwanted airflow impact, while improving the smoothness and stability of the rising flow of flue gas and the rising flow of the heat-insulating airflow, thereby improving the heat output stability of the combustion assembly while optimizing the blocking effect of overflowing heat.

[0101] Regardless of the method described above, the airflow generated by combustion in the smoke guide channel 2.1 is unlikely to cause unwanted obstruction to the airflow in the heat-insulating cavity 2.2, so that the heat-insulating airflow that blocks heat can always be smoothly formed in the heat-insulating cavity 2.2 as described above.

[0102] Furthermore, when the air outlet 2.4 is located on the connecting wall 2.62, the guiding effect of the flow guide wall 2.61 on the airflow will cause the diameter of the smoke guide channel 2.1 at the connecting wall 2.62 to shrink, resulting in increased flow velocity and decreased fluid pressure in this area. This will better attract the airflow in the heat insulation cavity 2.2, further improving the smoothness of the formation and flow of the heat insulation airflow (the airflow from the first air inlet 2.3 into the heat insulation cavity 2.2 and then out through the air outlet 2.4 into the smoke guide channel 2.1), thereby improving the overall blocking effect on the overflowing heat and better reducing the surface temperature of the smoke guide shell 2.

[0103] Furthermore, when a flow guide 2.6 is provided, as shown in the attached... Figure 10As shown, the sidewall of the smoke guide channel 2.1 can also be bent to form a stepped flow section 2.11 that extends laterally and is located below the flow guide section 2.6. The stepped flow section 2.11 is provided with an air supply channel 2.12, which is a channel provided in the stepped flow section 2.11. The upper end of the channel is connected to the smoke guide channel 2.1, and the lower end is open, so that air in the external space of the smoke guide housing 2 can enter the smoke guide channel 2.1 through the air supply channel 2.12.

[0104] In this way, by setting the air supply channel 2.12, the amount of air entering can be further increased so that the gas can be burned more completely. On the other hand, combined with the setting of the above-mentioned guide section 2.6, under the condition that the rest of the settings are the same, adding the air supply channel 2.12 can increase the overall air intake, thereby better improving the gas flow rate in the smoke guide channel 2.1 at the connecting wall 2.62, further contributing to the formation and smooth flow of the heat-resistant airflow, so as to better prevent the heat in the smoke guide channel 2.1 from overflowing outward.

[0105] In this embodiment, the air supply duct 2.12 is configured to extend vertically so that air from the external space can flow upward into the smoke guide duct 2.1 in a manner compatible with the upward discharge of flue gas. In this way, the airflow not only replenishes the air as described above, increasing the air velocity, but also, in some cases, forms an upward-flowing air curtain near the sidewall of the smoke guide duct 2.1, better preventing heat from escaping from the smoke guide duct 2.1 and further enhancing the heat-blocking effect.

[0106] In any of the above schemes, the specific number and height position of the first air inlet channel 2.3, air outlet channel 2.4 and flow passage 2.211 can be set according to requirements.

[0107] In this embodiment, as shown in the appendix Figure 5 and attached Figure 6 As shown, at least two first air inlet channels 2.3 can be provided, with the two first air inlet channels 2.3 distributed vertically at intervals. One first air inlet channel 2.3 is connected to the upper region of the heat transfer cavity 2.2b; the other first air inlet channel 2.3 is connected to the lower region of the heat transfer cavity 2.2b. (Vertically, the heat transfer cavity 2.2b is divided into three equal parts, from top to bottom, into an upper region, a middle region, and a lower region.)

[0108] In this way, the heat-insulating structure has two air inlets spaced apart vertically, which can cover a larger air intake area, improve the smoothness and volume of airflow into the heat flow cavity 2.2b during operation, and thus better form the aforementioned heat-insulating airflow to improve the heat blocking effect.

[0109] At this point, there are at least two ways to configure the air outlet 2.4, specifically:

[0110] In this embodiment, one approach is as follows:

[0111] As attached Figure 7 As shown, at least two vent channels 2.4 are provided, and the two vent channels 2.4 are distributed vertically at intervals; and, wherein: one vent channel 2.4 is connected to the upper region of the near-heat flow cavity 2.2a; the other vent channel 2.4 is connected to the lower region of the near-heat flow cavity 2.2a. (In the vertical direction, the near-heat flow cavity 2.2a is divided into three equal parts, from top to bottom, into an upper region, a middle region, and a lower region.)

[0112] Thus, as attached Figure 7 As shown, the airflow flowing into the near-heat flow cavity 2.2a splits into two paths. One path flows upward within the cavity and enters the smoke guide channel 2.1 through an upper outlet 2.4. The other path flows downward within the cavity and enters the smoke guide channel 2.1 through a lower outlet 2.4. This creates a larger heat-resistant airflow area within the near-heat flow cavity 2.2a, improving the heat-blocking effect.

[0113] Furthermore, at this point, the flow channel 2.211 can be configured such that one end of its opening connects to the central region of the near-heat flow cavity 2.2a, and the other end connects to the central region of the far-heat flow cavity 2.2b. In this way, while forming a large-area airflow for heat blocking as described above, both airflow paths have relatively short flow paths, allowing each airflow to better and faster carry the heat dissipated to the near-heat flow cavity 2.2a back to the smoke guide channel 2.1, reducing the likelihood of uneven heat blocking and further improving the overall heat blocking effect.

[0114] Specifically, the other air outlet 2.4 located at the lower end can be aligned with the combustion zone. That is, the end of the other air outlet 2.4 away from the near-heat flow chamber 2.2a is aligned with the combustion zone, so that the airflow output from the other air outlet 2.4 can be delivered to the combustion zone of the smoke guide passage 2.1. In this way, the air with a certain amount of heat in the near-heat flow chamber 2.2a can participate in the combustion in the combustion assembly, which can improve the overall combustion efficiency and combustion effect of the combustion assembly.

[0115] At this time, for the setting of the two air outlet channels 2.4, a guide section 2.6 is provided to match each air outlet channel 2.4, and each air outlet channel 2.4 is located in the back flow wall 2.63 or connecting wall 2.62 of the guide section 2.6 it matches.

[0116] As another way:

[0117] As attached Figure 8 and attached Figure 9 As shown, the air outlet 2.4 is preferably connected to the upper region of the near-heat flow cavity 2.2a, so that the airflow can flow into the near-heat flow cavity 2.2a from the middle region and flow out from the upper region of the near-heat flow cavity 2.2a.

[0118] At this point, in this embodiment, as shown in the appendix Figure 9 and attached Figure 10 As shown, a second air inlet channel 2.2a1 is also provided in the bottom wall of the near-heat flow cavity 2.2a (i.e., the cavity wall at the bottom of the near-heat flow cavity 2.2a). This allows for the formation of a larger area of ​​heat-resistant airflow in the near-heat flow cavity 2.2a, thereby improving the heat blocking effect.

[0119] Furthermore, the second air inlet 2.2a1 is a vertically penetrating channel located on the bottom wall of the near-heat flow cavity 2.2a. The upper end of this channel is connected to the near-heat flow cavity 2.2a, while the lower end is open, allowing air from the external space to flow upwards into the near-heat flow cavity 2.2a in accordance with the upward flow of flue gas. Thus, driven by the upward flow of high-temperature flue gas, air in the external space of the flue gas guide shell 2 can flow upwards more smoothly into the near-heat flow cavity 2.2a and then smoothly upwards to the air outlet 2.4, forming a better and more stable continuous flow of heat-resistant airflow and optimizing the blocking effect of overflowing heat.

[0120] In this embodiment, the flow channel 2.211 can also be configured such that one end of its opening is connected to the central region of the near-heat flow cavity 2.2a, and the other end is connected to the central region of the far-heat flow cavity 2.2b. Referring to the above description of the airflow in the near-heat flow cavity 2.2a, the airflow uniformity in the far-heat flow cavity 2.2b can be improved.

[0121] Furthermore, when a second air intake duct 2.2a1 is provided:

[0122] At least one side wall of the near-hot flow cavity 2.2a may also be provided with a protrusion that is laterally opposite to the central region of the smoke guide channel 2.1 (the region where the axis of the smoke guide channel 2.1 is located, which is often also the region where high-temperature flue gas accumulates) and protrudes towards the near-hot flow cavity 2.2a. The provision of this protrusion results in a narrow opening region in the near-hot flow cavity 2.2a with a reduced diameter; for example, by providing the protrusion, the diameter (diameter or size of the cavity opening) of the near-hot flow cavity 2.2a is arranged in a large-small-large pattern in the vertical direction (i.e., a pattern of first decreasing and then increasing); and the region of the near-hot flow cavity 2.2a with a reduced diameter (narrow opening region) is laterally opposite to the central region of the smoke guide channel 2.1.

[0123] For example, attached Figure 9 As shown, the side wall of the near-heat flow cavity 2.2a, which is close to the smoke guide channel 2.1 in the lateral direction, is provided with a first protrusion 2.2a that is positioned opposite to the central region of the smoke guide channel 2.1 in the lateral direction and protrudes into the near-heat flow cavity 2.2a.

[0124] By setting a protrusion, the airflow velocity in the near-heat flow cavity 2.2a can be increased to a certain extent when it flows through the narrow opening area that is laterally opposite to the central area of ​​the flue gas channel 2.1. This not only increases the contact area between the airflow and the flue gas housing 2, thus better carrying the heat transferred to the side wall of the flue gas channel 2.1 back into the flue gas channel 2.1 and optimizing the heat insulation effect, but also, based on the working characteristics of the combustion components in the gas water heater, under a certain airflow flow, areas where heat is more easily overflowed can be carried back to the flue gas channel 2.1 more quickly through a faster airflow; while other areas where heat overflow is slower can be carried back to the flue gas channel 2.1 through a slower but larger airflow, stably, slowly and fully transferring heat with the side wall of the flue gas channel 2.1, thereby improving the overall heat insulation effect.

[0125] In some designs, the cross-sectional area of ​​the protrusion can be gradually increased from bottom to top to better guide the airflow to flow smoothly from bottom to top in the near-hot flow cavity 2.2a.

[0126] Furthermore, as shown in the appendix Figure 9 As shown, the side wall of the near-heat flow cavity 2.2a facing away from the smoke guide channel 2.1 has a portion laterally aligned with the protrusion (i.e., the partition plate 2.21 has a portion laterally aligned with the protrusion), and some flow channels 2.211 are provided in this portion. When a heat-resistant airflow is formed as described above, the airflow in the far-heat flow cavity 2.2b can flow into the near-heat flow cavity 2.2a more quickly through these flow channels 2.211, increasing the overall flow rate of the heat-resistant airflow, further optimizing and improving the blocking effect on overflowing heat, and better reducing the surface temperature of the smoke guide shell 2.

[0127] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model. Furthermore, the terms "vertical," "horizontal," "front," and "rear," etc., mentioned in the embodiments of the present utility model, indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product is in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present utility model. It should be further noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," and "fixing" in the description should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the present utility model according to the specific circumstances.

[0128] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A 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 outward; The smoke guide housing (2) has a smoke guide channel (2.1) that is connected to the combustion port (1.11) and discharges the smoke generated by combustion upwards. The lower end 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 sidewall of the smoke guiding channel (2.1), the heat-resistant structure comprising: A near-heat flow cavity (2.2a) and a far-heat flow cavity (2.2b) are disposed in the side wall of the smoke guide channel (2.1), wherein the near-heat flow cavity (2.2a) is located between the far-heat flow cavity (2.2b) and the smoke guide channel (2.1); A flow channel (2.211) connecting the near-heat flow cavity (2.2a) and the far-heat flow cavity (2.2b); An air outlet (2.4) is provided to connect the near-heat flow cavity (2.2a) with the smoke guide channel (2.1); A first air inlet (2.3) is provided to connect the heat flow cavity (2.2b) with the external space of the smoke guide housing (2).

2. The combustion assembly according to claim 1, characterized in that: At least two first air intake channels (2.3) are provided, and the two first air intake channels (2.3) are distributed vertically at intervals, wherein: One of the first air inlet channels (2.3) is connected to the upper region of the far-heat flow cavity (2.2b); Another of the first air inlets (2.3) is connected to the lower end region of the far-heat flow cavity (2.2b).

3. The combustion assembly according to claim 2, characterized in that: At least two air outlet channels (2.4) are provided, and the two air outlet channels (2.4) are distributed vertically at intervals, wherein: One of the air outlet channels (2.4) is connected to the upper region of the near-heat flow cavity (2.2a); Another of the vent channels (2.4) is connected to the lower region of the near-heat flow cavity (2.2a).

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

5. The combustion assembly according to claim 4, characterized in that: The second air inlet (2.2a1) is configured to extend vertically so that air from the external space can flow upward into the near-heat flow cavity (2.2a) in accordance with the upward discharge of flue gas from the second air inlet (2.2a1).

6. The combustion assembly according to any one of claims 3 to 5, characterized in that: The flow channel (2.211) is configured such that one end of it is connected to the central region of the near-heat flow cavity (2.2a), and the other end is connected to the central region of the far-heat flow cavity (2.2b).

7. The combustion assembly according to claim 1, characterized in that: The sidewall of the smoke guide channel (2.1) is provided with a guide portion (2.6) protruding into the smoke guide channel (2.1); The flow guide (2.6) is hollow inside and is connected to the near-heat flow cavity (2.2a); Furthermore, the outer wall of the guide portion (2.6) includes: The guide wall (2.61) facing the combustion port (1.11) is inclined so as to guide the airflow flowing upward from the side wall of the smoke guide channel (2.1) to the center of the smoke guide channel (2.1); Backflow wall (2.63) facing away from the combustion port (1.11); And a connecting wall (2.62) that extends vertically and connects the flow-guiding wall (2.61) to the backflow wall (2.63); The air outlet (2.4) is disposed in the backflow wall (2.63).

8. The combustion assembly according to claim 1, characterized in that: The sidewall of the smoke guide channel (2.1) is provided with a guide portion (2.6) protruding into the smoke guide channel (2.1); The flow guide (2.6) is hollow inside and is connected to the near-heat flow cavity (2.2a); Furthermore, the outer wall of the guide portion (2.6) includes: The guide wall (2.61) facing the combustion port (1.11) is inclined 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); Backflow wall (2.63) facing away from the combustion port (1.11); And a connecting wall (2.62) that extends vertically and connects the flow-guiding wall (2.61) to the backflow wall (2.63); The air outlet (2.4) is disposed in the connecting wall (2.62).

9. The combustion assembly according to claim 8, characterized in that: The sidewall of the smoke guide channel (2.1) is formed in a bent manner with a stepped flow section (2.11) that extends laterally and is located below the flow guide section (2.6); The stepped flow section (2.11) is provided with an air supply channel (2.12), which allows air from the external space of the smoke guide housing (2) to enter the smoke guide channel (2.1).

10. A gas-fired water heater, characterized in that: It includes the combustion assembly as described in any one of claims 1 to 9.

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