Combustion device and gas water heater

Abstract

The utility model relates to the technical field of household appliances, in particular to a combustion device and a gas water heater, and the combustion device comprises a combustor used for forming flames and 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, 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; the lower end area of the heat resisting cavity is communicated with the outer space of the smoke guiding shell through the air inlet hole channel. The combustion device can prevent heat from being dissipated outwards through a simple structure, so that the combustion device has higher economical efficiency; the utility model further discloses the gas water heater with the combustion device.

Description

Technical Field

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

[0002] Gas water heaters are based on the principle of releasing energy through gas combustion and achieve rapid heating of liquid working fluid through heat exchange devices. Their core architecture includes the following functional modules: combustion device (high temperature flame generation unit), heat exchanger (gas-water heat conduction pipeline system), fan system (including turbine fan unit), and supporting pipelines and electronic control unit.

[0003] In existing technologies, to eliminate the thermal radiation impact of high-temperature combustion devices on surrounding electronic components, two common thermal management schemes are employed: Scheme 1 involves constructing a circulating cooling water network within the combustion chamber shell, while Scheme 2 involves configuring forced convection cooling components around the equipment. Engineering practice has verified that:

[0004] For water-cooled systems, the cooling pipes need to be arranged in a three-dimensional staggered pattern with the combustion chamber, which increases the difficulty of component assembly. To prevent leakage of the cooling medium and oxidation and corrosion of the metal conduits, high-precision sealing pipes must be used and surface passivation treatment must be performed, which significantly increases material costs. There is a risk of scaling during continuous operation of the equipment, which leads to a decrease in heat transfer efficiency and an increase in maintenance costs.

[0005] For forced convection cooling solutions, additional cooling fan components are required, which not only increases the cost of purchasing parts, but also requires the construction of dedicated airflow channels and independent power supply systems, resulting in a significant increase in the complexity of the overall structure layout.

[0006] Technical assessments indicate that both current mainstream heat dissipation technologies suffer from systemic defects such as excessively high manufacturing costs and poor economic efficiency. Utility Model Content

[0007] One of the purposes of this utility model is to address the shortcomings of the existing technology by providing a combustion device that combines the characteristics of gas combustion and can block heat from escaping 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 device.

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

[0010] Combustion device, 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] A heat-insulating cavity is installed in the side wall of the smoke guide channel;

[0015] An air outlet is provided to connect the heat-insulating cavity and the smoke guiding channel;

[0016] An air inlet channel connects the lower part of the heat-insulating cavity to the external space of the smoke guide shell.

[0017] In some designs, the vent is connected to the upper region of the heat-insulating cavity.

[0018] In some designs, the air inlet is located in the bottom wall of the heat-insulating cavity and is configured to extend vertically so that air from the outside space can flow upward into the heat-insulating cavity from the air inlet in accordance with the upward discharge of flue gas.

[0019] In some designs, the heat-insulating cavity has a sidewall located between the smoke guide channel and the heat-insulating cavity, the sidewall having a plurality of heat-drawing portions protruding into the heat-insulating cavity.

[0020] In some designs, multiple heat-resistant structures are arranged around the smoke guide channel, and the heat-resistant cavities in each heat-resistant structure are interconnected to form an annular cavity around the outer periphery of the smoke guide channel.

[0021] In some designs, the sidewalls of the smoke guide duct are provided with a protruding guide section for the smoke guide duct;

[0022] The flow guide section has a hollow cavity and is connected to the heat-insulating cavity;

[0023] Furthermore, the outer wall of the guide portion includes:

[0024] 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.

[0025] The backflow wall facing away from the combustion port;

[0026] And a connecting wall that extends vertically and connects the flow-inducing wall to the backflow wall;

[0027] The air outlet is located on the back wall.

[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 heat-insulating 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 at 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 vent is located on the connecting wall.

[0035] 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;

[0036] 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.

[0037] In some designs, the air supply duct is configured to extend vertically so that air from the outside space can flow upwards into the flue gas channel in a manner that allows the flue gas to be discharged upwards.

[0038] A gas water heater comprising the combustion device described in any of the above embodiments.

[0039] The main beneficial effects of the above technical solution are as follows:

[0040] 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, thus effectively controlling the surface temperature of the combustion device.

[0041] 2. The overall heat-insulating structure is simpler, which can better reduce production costs.

[0042] 3. 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 device and forming a high-efficiency gas combustion structure.

[0043] 4. By forming a heat-resistant structure, more and more stable oxygen from the external space can be input into the smoke guide channel when the combustion device is working, so as to better form a uniform oxygen and stable combustion chamber in the smoke guide shell.

[0044] 5. Connect the air outlet to the upper region of the heat-insulating cavity to allow airflow to flow into the heat-insulating cavity from the lower region and out from the upper region. This creates a larger airflow area within the heat-insulating cavity, resulting in a larger heat-blocking area and improving the heat-blocking effect.

[0045] 6. By setting up a flow guide, on the one hand, the airflow (air, gas, and high-temperature flue gas, etc.) can be better concentrated in the center of the flue, thereby improving combustion efficiency and heat concentration rate, and thus enabling better heat accumulation and output, which facilitates better utilization of heat in the future; on the other hand, it can simultaneously drive the airflow away from the side wall of the flue, thereby further reducing the effect of heat transfer to the outside.

[0046] 7. Further, by setting the air outlet channel on the connecting wall, the airflow in the heat-insulating cavity can be better attracted, further improving the smoothness of the heat-insulating airflow, thereby improving the overall blocking effect on overflowing heat and better reducing the surface temperature of the smoke guide shell.

[0047] 8. 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, with the rest of the settings being 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.

[0048] Further or more detailed beneficial effects will be described in conjunction with specific embodiments in the detailed implementation. Attached Figure Description

[0049] The present invention will be further described below with reference to the accompanying drawings:

[0050] Figure 1 This is a schematic diagram of the internal structure of a gas water heater.

[0051] Figure 2 This is a schematic diagram of the combustion device installation structure.

[0052] Figure 3 This is a cross-sectional schematic diagram of the combustion device.

[0053] Figure 4 This is a schematic diagram of a heat exchanger.

[0054] Figure 5 This is a cross-sectional view of the smoke guide shell.

[0055] Figure 6 This is a magnified schematic diagram of the air outlet channel.

[0056] Figure 7 This is an enlarged schematic diagram of the air intake channel.

[0057] Figure 8 This is an enlarged schematic diagram of the air intake channel when a supplementary air channel is provided.

[0058] Figure 9 This is a schematic diagram of the installation structure of the smoke guide shell.

[0059] Figure 10 This is a schematic diagram of an installation structure for the smoke guide shell when a protrusion is formed in the heat-insulating cavity.

[0060] Figure 11 This is a cross-sectional schematic diagram of the smoke guide shell with protrusions and replenishment channels. Detailed Implementation

[0061] The present invention will be illustrated with specific examples below:

[0062] Example:

[0063] 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 device for forming a high-temperature flame, a heat exchanger 3 with a water pipe for transferring high temperature to cold water in the water pipe, and a fan assembly 4 for forming a directional airflow.

[0064] Specifically, for example, attached Figure 1 As shown, as an example, the combustion device 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.

[0065] 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).

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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 adjacent 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.

[0070] 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.

[0071] 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.

[0072] 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 3As 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] In summary, the combustion device, 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 device. When the combustion device operates as described above, the high-temperature heat inside the flue gas casing 2 easily escapes, causing the surface temperature of the flue gas casing 2 to become excessively high, affecting its service life. This also adversely affects the electrical components outside the combustion device, potentially significantly reducing the lifespan of the gas water heater in severe cases.

[0079] Therefore, a combustion device is needed that can prevent heat leakage from the smoke guide shell 2 and better reduce the surface temperature of the smoke guide shell 2. A gas water heater equipped with such a combustion device is proposed.

[0080] 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 device; moreover, in order to better prevent water leakage and water corrosion, the water-cooled piping structure often requires a large cost.

[0081] To address the aforementioned issues while simplifying the structure and reducing costs, this application proposes a combustion device that, by combining the characteristics of gas combustion, can prevent heat loss through a simple structure, thus achieving higher economic efficiency. A gas water heater incorporating this combustion device is also proposed.

[0082] As an example, see attached Figure 3 and attached Figure 5 As shown, the combustion device in this embodiment also includes a heat-resistant structure formed in the sidewall of the smoke guide channel 2.1.

[0083] Specifically, the heat-insulating structure includes: a heat-insulating cavity 2.2, an air outlet channel 2.4, and an air inlet channel 2.3. More precisely, for example, [the structure includes...]. Figure 3 and attached Figure 5 As shown, the heat-insulating cavity 2.2 is a cavity located in the side wall of the smoke guiding channel 2.1; the air outlet 2.4 is a hole located in the side wall of the heat-insulating cavity 2.2, which is laterally closer to the smoke guiding channel 2.1, and connects the heat-insulating cavity 2.2 with the smoke guiding channel 2.1; the air inlet 2.3 can be a hole located in the side wall of the heat-insulating cavity 2.2, which is laterally farther from the smoke guiding channel 2.1, or in the bottom wall of the heat-insulating cavity 2.2, and connects the heat-insulating cavity 2.2 with the outside air, and the air inlet 2.3 is connected to the lower end region of the heat-insulating cavity 2.2. (In the vertical direction, the heat-insulating cavity 2.2 is divided into three equal parts, from top to bottom, into an upper region, a middle region, and a lower region.)

[0084] At this time, when a flame forms in the combustion zone of the smoke guide duct 2.1, it consumes oxygen and fuel gas, and forms directly rising high-temperature flue gas, creating a low-pressure zone in the smoke guide duct 2.1. Meanwhile, external air enters the heat-insulating cavity 2.2 through the air inlet duct 2.3, flows through the heat-insulating cavity 2.2, and then flows out through the air outlet duct 2.4 back into the smoke guide duct 2.1, thus creating a flowing airflow in the heat-insulating cavity 2.2 (as shown in the attached diagram). Figure 5 (As indicated by the middle arrow) This is 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 through the smoke guide channel 2.1 back into the smoke guide channel 2.1. It not only prevents the heat generated by the flame combustion in the smoke guide shell 2 from overflowing outward, effectively controlling the surface temperature of the combustion device, but also brings 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 device. At the same time, the above-mentioned 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 deal with the control of the water cooling circuit and the problem of water corrosion, thus better avoiding the problems associated with water cooling.

[0085] The specific location of the air outlet 2.4 can be set according to requirements. In this embodiment, as shown in the attached figure... Figure 3 and attached Figure 5 As shown, the air outlet 2.4 is preferably connected to the upper region of the heat-insulating cavity 2.2, so that airflow can flow into the heat-insulating cavity 2.2 from the lower region and out from the upper region. This allows for the formation of a larger airflow area in the heat-insulating cavity 2.2, thereby creating a larger heat-blocking area and improving the blocking effect of overflowing heat.

[0086] Furthermore, in this embodiment, as shown in the appendix Figure 5 and attached Figure 7 As shown, the air inlet channel 2.3 is disposed in the bottom wall of the heat-insulating cavity 2.2 (i.e., the cavity wall at the bottom of the heat-insulating cavity 2.2) and is configured to extend vertically. That is, the air inlet channel 2.3 is a vertically penetrating channel disposed in the bottom wall of the heat-insulating cavity 2.2. The upper end of the channel is connected to the heat-insulating cavity 2.2, and the lower end is open, so that air from the external space can flow upward into the heat-insulating cavity 2.2 from the air inlet channel 2.3 in accordance with the upward discharge of flue gas. In this way, driven by the upward flow of high-temperature flue gas, the air in the external space of the flue gas guide shell 2 can flow upward into the heat-insulating cavity 2.2 more smoothly, and flow upward to the air outlet channel 2.4, so as to form a continuous flow of heat-insulating airflow more effectively and stably, and optimize the blocking effect of overflowing heat.

[0087] In any of the above schemes, as shown in the appendix Figure 6 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.

[0088] Specifically, the guide section 2.6 has a hollow interior and is connected to the heat-insulating cavity 2.2. 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 combustion port 1.11 after it is output); a backflow wall 2.63 facing away from the combustion port 1.11 (i.e., the airflow flowing away from the combustion port 1.11 after it is output); 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, thus connecting the guide wall 2.61 and the backflow wall 2.63. (See attached image for example.) 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.

[0089] 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.

[0090] In this case, as a method, the air outlet 2.4 can be set on the back flow wall 2.63.

[0091] 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 upward flow of flue gas and the upward flow of the heat-insulating airflow, thereby improving the heat output stability of the combustion device while optimizing the blocking effect of overflow heat.

[0092] Regardless of the method described above, the airflow generated by combustion in the smoke guide channel 2.1 is unlikely to cause unnecessary 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.

[0093] 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 external 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.

[0094] Furthermore, when a flow guide 2.6 is provided, as shown in the attached... Figure 8 As 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.

[0095] 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.

[0096] 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.

[0097] In some designs, the sidewall of the heat-insulating cavity 2.2 located between the smoke guide channel 2.1 and the heat-insulating cavity 2.2 may be provided with a plurality of heat-drawing portions 2.24 protruding into the heat-insulating cavity 2.2. This increases the contact area between the airflow and the sidewall of the smoke guide channel 2.1, thereby improving the heat exchange efficiency between the airflow and the sidewall of the smoke guide channel 2.1, allowing the airflow flowing through the heat-insulating cavity 2.2 to carry an equal amount of heat back to the smoke guide channel 2.1.

[0098] To improve the overall heat blocking effect, multiple heat-blocking structures as described above can be arranged around the smoke guide channel 2.1, and the heat-blocking cavities 2.2 in each heat-blocking structure are interconnected to form an annular cavity around the outer periphery of the smoke guide channel 2.1, which blocks the heat in the smoke guide shell 2 from overflowing outward in a 360-degree manner.

[0099] At this time, as attached Figure 9 As shown, the smoke guide housing 2 mainly consists of an inner housing 2a with an internal smoke guide channel 2.1, and an outer housing surrounding the inner housing 2a. A heat-insulating cavity 2.2 is formed between the inner housing 2a and the outer housing at intervals. The outer housing includes a first outer plate 2b.1 and a second outer plate 2b.2, which are detachably connected by, for example, screws to form the outer housing. Preferably, both the first outer plate 2b.1 and the second outer plate 2b.2 are detachably fixed to the inner housing 2a by, for example, screws. An exhaust duct 2.4 is provided in the inner housing 2a, and an intake duct 2.3 is provided in the outer housing.

[0100] Based on any of the above schemes, especially in the scheme with the flow guide 2.6, as shown in the appendix Figure 10 As shown, at least one side wall of the heat-insulating cavity 2.2 may also be provided with a protrusion facing the center 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 lateral direction. The arrangement of this protrusion is such that: in the vertical direction, the diameter (diameter or size of the cavity opening) of the heat-insulating cavity 2.2 is arranged in a large-small-large pattern (i.e., an arrangement that first decreases and then increases); and the region where the diameter of the heat-insulating cavity 2.2 decreases is positioned in the lateral direction opposite to the center region of the smoke-guiding channel 2.1.

[0101] For example, attached Figure 10As shown, the heat-insulating cavity 2.2 has a first protrusion 2.21 on one side wall of the heat-insulating cavity 2.2 that is laterally opposite to the central region of the smoke-guiding channel 2.1 and protrudes into the heat-insulating cavity 2.2; or, the heat-insulating cavity 2.2 has a second protrusion 2.22 on one side wall of the heat-insulating cavity 2.2 that is laterally opposite to the central region of the smoke-guiding channel 2.1 and protrudes into the heat-insulating cavity 2.2.

[0102] By setting a protrusion, the airflow velocity in the heat-insulating cavity 2.2 can be increased to a certain extent when flowing 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 device 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.

[0103] In some designs, the cross-sectional area of ​​the protrusion can be gradually increased from bottom to top to better guide the airflow smoothly from bottom to top in the heat-insulating cavity 2.2.

[0104] Furthermore, as shown in the appendix Figure 11 As shown, the heat-insulating cavity 2.2 has a portion laterally aligned with the protrusion on the side wall opposite to the smoke guide channel 2.1 (i.e., the side wall of the heat-insulating cavity 2.2 that is laterally away from the smoke guide channel 2.1). This portion may also be provided with a flow-inlet channel 2.23 for air from the external space of the smoke guide housing 2 to flow into the heat-insulating cavity 2.2. When a heat-insulating airflow is formed as described above, the external airflow can flow into the heat-insulating cavity 2.2 more quickly through the flow-inlet channel 2.23, increasing the overall flow rate of the heat-insulating airflow, further optimizing and improving the blocking effect on overflowing heat, and better reducing the surface temperature of the smoke guide housing 2.

[0105] 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.

[0106] 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 device, 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 heat-insulating cavity (2.2) is disposed in the side wall of the smoke guiding channel (2.1); An air outlet (2.4) is provided to connect the heat-insulating cavity (2.2) with the smoke guiding channel (2.1); An air inlet channel (2.3) is provided to connect the lower end region of the heat-insulating cavity (2.2) with the external space of the smoke guide housing (2).

2. The combustion device according to claim 1, characterized in that: The air outlet (2.4) is connected to the upper region of the heat-insulating cavity (2.2).

3. The combustion device according to claim 2, characterized in that: The air inlet channel (2.3) is disposed in the bottom wall of the heat-insulating cavity (2.2) and is configured to extend vertically so that air from the outside space can flow upward into the heat-insulating cavity (2.2) from the air inlet channel (2.3) in a manner that allows flue gas to be discharged upward.

4. The combustion device according to claim 1, characterized in that: The heat-insulating cavity (2.2) has a plurality of heat-drawing parts (2.24) protruding into the heat-insulating cavity (2.2) on one side wall between the smoke guide channel (2.1) and the heat-insulating cavity (2.2).

5. The combustion device according to claim 1, characterized in that: Multiple heat-insulating structures are provided around the smoke guiding channel (2.1), and the heat-insulating cavities (2.2) in each heat-insulating structure are interconnected to form an annular cavity around the outer periphery of the smoke guiding channel (2.1).

6. The combustion device according to any one of claims 1 to 5, 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 heat-insulating cavity (2.2); 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 on the backflow wall (2.63).

7. The combustion device according to any one of claims 1 to 5, 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 heat-insulating cavity (2.2); 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 on the connecting wall (2.62).

8. The combustion device according to claim 7, 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).

9. The combustion device according to claim 8, characterized in that: The air supply channel (2.12) is configured to extend vertically so that air from the external space can flow upward into the smoke guide channel (2.1) from the air supply channel (2.12) in a manner that allows the flue gas to be discharged upward.

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

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