Combustion appliance and gas water heater

Abstract

The invention relates to the technical field of household appliances, in particular to a combustion appliance and a gas water heater, and the combustion appliance comprises a combustor used for forming flames and provided with a combustion port allowing the flames to be sprayed 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; and the first air inlet duct is used for communicating the middle area of the heat resistance cavity with the external space of the smoke guide shell. The combustion appliance can prevent heat from being dissipated outwards through a simple structure, so that the combustion appliance has higher economical efficiency; the invention further discloses the gas water heater with the combustion appliance.

Description

Technical Field

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

[0002] A gas water heater is a household device that releases heat energy through gas combustion and quickly heats water flow by means of a heat exchange device. This device mainly consists of four core components: a combustion appliance (for generating high-temperature flames), a heat exchanger (for completing heat transfer between gas and water through heat exchange pipes), a fan system (including key components such as a turbo fan), and supporting pipelines and an electrical control unit.

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

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

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

[0006] In summary, the above two conventional heat dissipation technologies both have technical defects such as high processing costs and insufficient economy. Summary of the Invention

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

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

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

[0010] A combustion appliance, comprising:

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

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

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

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

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

[0016] A first air inlet passage for communicating the middle area of the heat insulation cavity with the external space of the smoke guide housing.

[0017] In some solutions, at least two air outlet passages are provided, and the two air outlet passages are spaced apart vertically, where:

[0018] One air outlet passage communicates with the upper end area of the heat insulation cavity;

[0019] The other air outlet passage communicates with the lower end area of the heat insulation cavity.

[0020] In some solutions, the other air outlet passage is arranged opposite to the combustion area so that: the airflow output from the other air outlet passage can be transported to the combustion area of the smoke guide passage.

[0021] In some solutions, the air outlet passage communicates with the upper end area of the heat insulation cavity;

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

[0023] In some solutions, the second air inlet passage is configured to extend vertically so that: the air in the external space can flow upward into the heat insulation cavity from the second air inlet passage in a manner adapted to the upward discharge of the smoke.

[0024] In some solutions, a plurality of heat insulation structures are arranged around the smoke guide passage, and the heat insulation cavities in each heat insulation structure communicate with each other to form an annular cavity surrounding the outer periphery of the smoke guide passage.

[0025] In some solutions, a flow guiding portion protruding into the smoke guide passage is arranged on the side wall of the smoke guide passage;

[0026] The inside of the flow guiding portion is arranged as a cavity and communicates with the heat insulation cavity;

[0027] And, the outer wall of the flow guiding portion includes:

[0028] The diversion wall facing the combustion port is inclined to guide the upward flowing air current from the side wall of the smoke guide channel to the center of the smoke guide channel;

[0029] The backflow wall facing away from the combustion port;

[0030] And the connecting wall extending vertically and connecting the diversion wall and the backflow wall;

[0031] The air outlet channel is arranged in the backflow wall.

[0032] In some solutions, the side wall of the smoke guide channel is provided with a diversion part protruding into the smoke guide channel;

[0033] The inside of the diversion part is arranged as a cavity and is communicated with the heat insulation cavity;

[0034] Moreover, the outer wall of the diversion part includes:

[0035] The diversion wall facing the combustion port is inclined to guide the air current at the side wall of the smoke guide channel to the center of the smoke guide channel;

[0036] The backflow wall facing away from the combustion port;

[0037] And the connecting wall extending vertically and connecting the diversion wall and the backflow wall;

[0038] The air outlet channel is arranged in the connecting wall.

[0039] In some solutions, the side wall of the smoke guide channel is bent to form a stepped flow part extending horizontally and located below the diversion part;

[0040] The stepped flow part is provided with a supplementary air channel for the air in the external space of the smoke guide housing to enter the smoke guide channel.

[0041] The gas water heater includes the combustion appliance described in any of the above solutions.

[0042] The main beneficial effects of the above technical solutions are as follows:

[0043] 1. By arranging a heat insulation structure capable of using cold air as a heat insulation medium in the side wall of the smoke guide channel in the smoke guide housing, the heat formed by the flame combustion in the smoke guide housing can be blocked from overflowing outward, effectively controlling the surface temperature of the combustion appliance.

[0044] 2. The overall heat insulation structure is simpler and can better reduce the production cost.

[0045] 3. In addition to being able to form air-cooled heat insulation, the heat insulation air current can also bring the dissipated heat back into the smoke guide channel to exchange heat with the heat exchanger, improving the overall effective heat output rate of the combustion appliance to form a high-efficiency gas combustion structure.

[0046] 4. By forming a heat insulation structure, when the combustion appliance is operating, more and more stable oxygen in the external space can be input into the smoke guide channel, so as to better form a uniform oxygen and stable combustion chamber in the smoke guide housing.

[0047] 5. Connect one air outlet channel to the upper region of the heat insulation cavity; connect the other air outlet channel to the lower region of the heat insulation cavity, which can not only form a larger area of heat insulation air flow in the heat insulation cavity and improve the heat blocking effect, but also, by forming upper and lower air flows in the heat insulation cavity, while forming a large area of air flow for heat insulation as described above, each air flow has a shorter flow path, enabling the air flow to better and faster bring the heat dissipated to the heat insulation cavity back to the smoke guide channel, so as to further improve the overall heat blocking effect.

[0048] 6. Connect the air outlet channel to the upper region of the heat insulation cavity, and a second air inlet channel is provided in the bottom wall of the heat insulation cavity. Driven by the upward flow of high-temperature flue gas, the air in the external space of the smoke guide housing can flow more smoothly upward into the heat insulation cavity and then flow smoothly upward to the air outlet channel, so as to better and more stably form a continuously flowing heat insulation air flow and optimize the heat blocking effect of the overflowing heat.

[0049] 7. By setting a diversion part, on the one hand, the air flow (such as air, gas and high-temperature flue gas, etc.) can be better gathered at the center of the smoke guide channel, so as to improve the combustion efficiency and heat concentration rate, and then better gather and output heat, which is convenient for better utilization of heat in the follow-up; on the other hand, it can synchronously drive the air flow away from the side wall of the smoke guide channel, so as to further weaken the effect of heat transfer outward.

[0050] 8. Further set the air outlet channel on the connecting wall, which can better attract the air flow in the heat insulation cavity, further improve the smoothness of the heat insulation air flow, so as to overall improve the heat blocking effect of the overflowing heat and better reduce the surface temperature of the smoke guide housing.

[0051] 9. By setting a supplementary air channel, on the one hand, it can further increase the intake of air, so that the gas can better burn fully; on the other hand, combined with the setting of the above-mentioned diversion part, under the same other settings, increasing the supplementary air channel can increase the overall intake air volume, and then better improve the gas flow rate in the smoke guide channel at the connecting wall, and further provide assistance for the formation and smooth flow of the heat insulation air flow, so as to better block the heat in the smoke guide channel from overflowing outward.

[0052] Further or more detailed beneficial effects will be described in combination with specific embodiments in the specific implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The present invention will be further described below with reference to the accompanying drawings:

[0054] Figure 1 It is a schematic diagram of the internal structure of a gas water heater.

[0055] Figure 2 It is a schematic diagram of the installation structure of a combustion appliance.

[0056] Figure 3 It is a schematic cross-sectional view of a combustion appliance.

[0057] Figure 4 It is a schematic diagram of the structure of a heat exchanger.

[0058] Figure 5 It is a schematic cross-sectional view of a smoke guide housing.

[0059] Figure 6 It is an enlarged schematic diagram of an air outlet channel.

[0060] Figure 7 It is a schematic cross-sectional view of a smoke guide housing when two air outlet channels are provided.

[0061] Figure 8 It is a schematic cross-sectional view of a smoke guide housing when a second air inlet channel is provided.

[0062] Figure 9 It is an enlarged schematic diagram of a second air inlet channel.

[0063] Figure 10 It is a schematic diagram of the setting of a supplementary air channel.

[0064] Figure 11 It is a schematic diagram of the installation structure of a smoke guide housing.

[0065] Figure 12 It is a schematic diagram of an installation structure of a smoke guide housing when a protrusion is formed in a heat insulation cavity. Detailed implementation manners

[0066] The present invention will be specifically illustrated below in conjunction with embodiments:

[0067] Embodiment:

[0068] A gas water heater, as shown in the appendix Figure 1 mainly includes a water heater housing and a number of functional components disposed within the water heater housing. The number of functional components mainly includes: a combustion appliance for forming a high-temperature flame, a heat exchanger 3 having a water pipe and for transferring high temperature to the cold water in the water pipe, and a fan assembly 4 for forming a directional air flow.

[0069] Specifically, for example, as shown in the appendix Figure 1As shown in the figure, as an example, the combustion device includes a burner 1 and a smoke guide housing 2. The smoke guide housing 2 is detachably fixedly connected to the burner 1 by a detachable connection method such as screws (for example, it is detachably fixedly connected to the burner housing 1.1 hereinafter by a detachable connection method such as screws), so that the smoke guide housing 2 can be easily maintained, cleaned or replaced in the later stage.

[0070] The burner 1 comprises a burner housing 1.1, and the upper end of the burner housing 1.1 has a combustion port 1.11 for the flame to be ejected outward. Figure 3 As shown as an example, an opening facing upward is formed at the upper end of the burner housing 1.1, and the opening is a combustion port 1.11; and a plurality of fire rows 1.2 are installed in a cavity in 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 in a gas water heater and a gas stove, such as an electric spark ignition device, etc.).

[0071] A gas channel for gas to flow into is formed in the fire grate 1.2. The lower end of the gas channel is connected to the gas delivery pipeline, and the upper end is communicated with the combustion port 1.11, so that the gas can be delivered to the combustion port 1.11 through the fire grate 1.2.

[0072] The lower end of the air inlet passage 1.12 is open to allow air to flow in; the upper end is communicated with the combustion port 1.11 so that external air can be transported from the air inlet passage 1.12 to the combustion port 1.11.

[0073] The smoke guide housing 2 is arranged above the burner 1, and the smoke guide housing 2 has a smoke guide channel 2.1 which is connected to the combustion port 1.11 and discharges the smoke generated by the combustion upward. The smoke guide channel 2.1 can be a hole arranged in the smoke guide housing 2 and is vertically through, and the lower end opening of the hole is connected to the combustion port 1.11.

[0074] At the same time, in order to better prevent the heat and smoke generated by combustion from overflowing, the lower opening of the smoke guide channel 2.1 is connected to the combustion port 1.11 (that is, the port of the combustion port 1.11 is in contact with or close enough to the port of the lower opening of the smoke guide channel 2.1), so that a combustion area for flame combustion is formed in the smoke guide channel 2.1. The channel diameter of the smoke guide channel 2.1 is often greater than or equal to the opening diameter of the combustion port 1.11.

[0075] During operation, gas is conveyed from the gas passage inside the burner row 1.2 to the combustion port 1.11, air flows from the air intake passage 1.12 to the combustion port 1.11, and the ignition device 1.3 is controlled to start for ignition. Thus, the gas at the combustion port 1.11 of the burner 1 can be ignited to form an upward gushing combustion flame. This combustion flame surges into the smoke guide passage 2.1 for combustion, so that a combustion zone for flame combustion is formed in the smoke guide passage 2.1. At this time, the flue gas and heat generated by combustion enter the smoke guide passage 2.1 and flow upward under the guiding action of the smoke guide passage 2.1.

[0076] The heat exchanger 3 is placed above the smoke guide housing 2 and is used to exchange heat with the high-temperature flue gas in the smoke guide passage 2.1 to form hot water.

[0077] Specifically, as an example shown in the appendix Figure 4 The heat exchanger 3 includes a heat exchange housing 3.1. The heat exchange housing 3.1 can be detachably connected to the smoke guide housing 2 by, for example, screws, or connected to other external support structures, such as the water heater housing. The heat exchange housing 3.1 has a heat exchange passage 3.11 with both ends being through (as shown in the appendix Figure 3 The lower end of the heat exchange passage 3.11 is butt-connected and communicated with the upper end opening of the smoke guide passage 2.1, so that the high-temperature flue gas generated by combustion in the smoke guide passage 2.1 can flow upward into the heat exchange passage 3.11.

[0078] At the same time, the heat exchanger 3 further includes a heat exchange pipe 3.2. One end of the heat exchange pipe 3.2 has a water inlet for water inlet and the other end has a water outlet for water outlet. The heat exchange pipe 3.2 is connected to the heat exchange housing 3.1 and has a part placed in the heat exchange passage 3.11. Realize: When combustion is carried out as described above to form a flame and high-temperature flue gas, the high-temperature flue gas flows into the heat exchange passage 3.11 to transfer heat to the part of the heat exchange pipe 3.2 placed in the heat exchange passage 3.11. At the same time, cold water is conveyed through, for example, a water pipe into the water inlet of the heat exchange pipe 3.2. The cold water is heated after flowing through the part of the heat exchange pipe 3.2 placed in the heat exchange passage 3.11 and then hot water is output from the water outlet for use.

[0079] In some cases, a number of heat exchange fins 3.3 (the heat exchange fins 3.3 are sheet structures made of materials with good thermal conductivity such as steel strips, stainless steel strips, copper strips, aluminum strips, etc.) can also be arranged in the heat exchange passage 3.11. The heat exchange fins 3.3 have parts that fit with the heat exchange pipe 3.2 to increase the heat exchange contact area with the high-temperature flue gas, and transfer the heat in the high-temperature flue gas to the heat exchange pipe 3.2 better and in a larger area, so as to further improve the heat exchange effect on the cold water in the heat exchange pipe 3.2.

[0080] The blower assembly 4 is a blower structure used in a gas water heater to form an air flow, and is configured to: form an air flow that drives the flue gas to flow from the flue gas passage 2.1 into the heat exchange passage 3.11.

[0081] The blower assembly 4 can be connected to the heat exchange housing 3.1, placed at the upper opening of the heat exchange passage 3.11, and is configured to: suck the flue gas in the flue gas passage 2.1. To drive the flue gas to flow from the flue gas passage 2.1 into the heat exchange passage 3.11. At this time, the blower assembly 4 is also provided with a smoke exhaust pipe for discharging the sucked flue gas in a directional manner, and this smoke exhaust pipe is used to communicate with the smoke exhaust port in the building to discharge the flue gas in a directional manner.

[0082] The blower assembly 4 can also be connected to the burner 1, placed at the lower opening of the air intake passage 1.12, and is configured to: blow the flue gas in the flue gas passage 2.1 upward. To drive the flue gas to flow from the flue gas passage 2.1 into the heat exchange passage 3.11. At this time, the upper opening of the heat exchange passage 3.11 is used to communicate with the smoke exhaust port in the building.

[0083] In summary, the combustion appliance, the heat exchanger 3 and the blower assembly 4 together constitute the main components of the gas water heater. In addition, the gas water heater also includes several electrical components arranged outside the combustion appliance. When the combustion appliance burns as described above, there will be: the high-temperature heat inside the flue gas housing 2 is likely to overflow, which will not only cause the surface temperature of the flue gas housing 2 to be too high, affecting the service life of the flue gas housing 2, but also have an adverse impact on the electrical components outside the combustion appliance, and in severe cases, it will greatly reduce the service life of the gas water heater.

[0084] Based on this, a combustion appliance that can block the overflow of heat in the flue gas housing 2 and can better reduce the surface temperature of the flue gas housing 2 is needed. And a gas water heater equipped with this combustion appliance is proposed.

[0085] As a form, a water cooling structure can be arranged on the outer surface of the flue gas housing 2 to solve the above problems. However, setting up a water cooling structure often requires setting up a complex pipeline structure, resulting in problems such as complex pipeline structure and difficult installation of the combustion appliance; moreover, in order to better prevent water leakage and water body corrosion, the water cooling pipeline structure often requires a large cost.

[0086] In order to solve the above problems and at the same time be able to better simplify the structure and reduce the cost, this application proposes: a combustion appliance that can block the heat from dissipating outward through a simple structure and has higher economy in combination with the gas combustion characteristics. And a gas water heater equipped with this combustion appliance is proposed.

[0087] As an example, as shown in the attached Figure 3 and the attached Figure 5As shown, the combustion appliance in this embodiment further includes a heat insulation structure formed in the side wall of the smoke guiding channel 2.1.

[0088] Specifically, the heat insulation structure includes a heat insulation cavity 2.2, an air outlet channel 2.4, and a first air inlet channel 2.3. To be exact, for example, as shown in Figure 3 and Figure 5 shown, the heat insulation cavity 2.2 is a cavity provided in the side wall of the smoke guiding channel 2.1; the air outlet channel 2.4 is a hole provided in the side wall of the heat insulation cavity 2.2 that is laterally close to the smoke guiding channel 2.1 and allows the heat insulation cavity 2.2 to communicate with the smoke guiding channel 2.1; the first air inlet channel 2.3 can be a hole provided in the side wall of the heat insulation cavity 2.2 that is laterally far from the smoke guiding channel 2.1 and allows the heat insulation cavity 2.2 to communicate with the external air, and the first air inlet channel 2.3 communicates with the middle region of the heat insulation cavity 2.2. (In the vertical direction, by trisecting the heat insulation cavity 2.2, the heat insulation cavity 2.2 is divided into an upper region, a middle region, and a lower region from top to bottom in sequence.)

[0089] At this time, when a flame is formed in the combustion area of the smoke guiding channel 2.1, oxygen and fuel gas are consumed, and high-temperature flue gas that rises directly is formed, creating a low-pressure area in the smoke guiding channel 2.1. At this time, external air enters the heat insulation cavity 2.2 through the first air inlet channel 2.3, flows through the heat insulation cavity 2.2, and then flows out to the smoke guiding channel 2.1 through the air outlet channel 2.4. Thus, a flowing air current (as shown by the arrow in Figure 5 ) can be formed in the heat insulation cavity 2.2, which is called a heat insulation air current. This heat insulation air current forms air-cooled heat insulation, which can bring back the heat dissipated from the surface of the smoke guiding shell 2 to the smoke guiding channel 2.1. It can not only block the heat formed by the flame combustion in the smoke guiding shell 2 from overflowing outward, effectively control the surface temperature of the combustion appliance, but also bring back the dissipated heat to the smoke guiding channel 2.1 for heat exchange with the heat exchanger 3, improving the overall effective heat output rate of the combustion appliance. At the same time, the above heat insulation structure does not require an additional complex water pipe structure, has a simpler and easier-to-install structure, and does not need to spend a large cost to handle the control of the water cooling circuit and the erosion problem of the water circuit, thus better avoiding the problems existing in water cooling.

[0090] In the above solution, as shown in Figure 6 shown, a guiding part 2.6 protruding into the smoke guiding channel 2.1 can also be provided on the side wall of the smoke guiding channel 2.1.

[0091] Specifically, the inside of the flow guiding part 2.6 is provided with a cavity and is communicated with the heat blocking cavity 2.2; moreover, the outer wall of the flow guiding part 2.6 (i.e., the side wall of the convex outer surface of the flow guiding part 2.6 that is used to contact the airflow in the smoke guiding channel 2.1) includes: a diversion wall 2.61 facing the combustion port 1.11 (i.e., after the airflow is output from the combustion port 1.11, facing the airflow direction), a backflow wall 2.63 facing away from the combustion port 1.11 (i.e., after the airflow is output from the combustion port 1.11, facing away from the airflow direction), and a connecting wall 2.62 extending vertically (vertically or arcuately) and connecting the diversion wall 2.61 and the backflow wall 2.63. That is, the upper end of the connecting wall 2.62 is connected to the backflow wall 2.63, and the lower end is connected to the diversion wall 2.61 to connect the diversion wall 2.61 and the backflow wall 2.63. For example, as shown in Figure 6 As shown, the outer wall of the flow guiding part 2.6 includes: a diversion wall 2.61 facing downward, a backflow wall 2.63 facing upward, and a connecting wall 2.62 extending arcuately vertically.

[0092] Among them, the diversion wall 2.61 is inclined to be able to guide the airflow flowing upward from the side wall of the smoke guiding channel 2.1 to the center of the smoke guiding channel 2.1 (the area where the axis of the smoke guiding channel 2.1 is located). In this way, on the one hand, the airflow (air, gas, high-temperature flue gas, etc.) can be better gathered at the center of the smoke guiding channel 2.1 to improve the combustion efficiency and heat concentration rate, and then the heat can be better concentrated and output, facilitating better utilization of the heat subsequently; on the other hand, it can simultaneously drive the airflow away from the side wall of the smoke guiding channel 2.1 to further weaken the effect of heat transfer outward.

[0093] At this time, as a way, the air outlet channel 2.4 can be arranged on the backflow wall 2.63.

[0094] Or, as another way, the air outlet channel 2.4 is arranged on the connecting wall 2.62; and the air outlet channel 2.4 is preferably arranged to extend obliquely, so that after the airflow in the heat blocking cavity 2.2 flows out from the air outlet channel 2.4, it can be conveyed obliquely upward. Realize that the airflow flowing out from the air outlet channel 2.4 into the smoke guiding channel 2.1 can better conform to the flow of the rising flue gas in the smoke guiding channel 2.1, reduce the unnecessary airflow impact, and at the same time improve the smoothness and stability of the rising flow of the flue gas and the rising flow of the heat blocking airflow, and then improve the stability of the heat output of the combustion appliance while optimizing the blocking effect of the overflow heat.

[0095] Regardless of the above method, the airflow formed by combustion in the smoke guiding channel 2.1 is not likely to have an unnecessary obstructive effect on the airflow in the heat blocking cavity 2.2, so that the heat blocking airflow for heat blocking as described above can always be smoothly formed in the heat blocking cavity 2.2.

[0096] Moreover, when the air outlet channel 2.4 is provided on the connecting wall 2.62, due to the guiding effect of the diversion wall 2.61 on the air flow, it will drive the diameter of the smoke guiding channel 2.1 at the connecting wall 2.62 to decrease, resulting in an increase in flow velocity and a decrease in fluid pressure in this area; thus, it can better attract the air flow in the heat resistance cavity 2.2, further improving the smoothness of the formation and circulation of the heat resistance air flow (the air flow in which the external air enters the heat resistance cavity 2.2 from the first air inlet channel 2.3 and then flows out from the air outlet channel 2.4 into the smoke guiding channel 2.1), so as to overall improve the blocking effect on the overflowing heat and better reduce the surface temperature of the smoke guiding housing 2.

[0097] Furthermore, when the diversion part 2.6 is provided, as shown in the appendix Figure 10 As shown, the side wall part of the smoke guiding channel 2.1 can also be formed in a bent shape with: a stepped flow part 2.11 that extends horizontally and is placed below the diversion part 2.6. A supplementary air channel 2.12 is provided in the stepped flow part 2.11. The supplementary air channel 2.12 is a channel provided in the stepped flow part 2.11. The upper end of the channel is connected to the smoke guiding channel 2.1 and the lower end is open, so that the air in the external space of the smoke guiding housing 2 can enter the smoke guiding channel 2.1 through the supplementary air channel 2.12.

[0098] In this way, by providing the supplementary air channel 2.12, on the one hand, it can further increase the air intake volume so that the gas can burn more fully; on the other hand, combined with the setting of the above-mentioned diversion part 2.6, with the rest of the settings being the same, adding the supplementary air channel 2.12 can increase the overall air intake volume, thereby better increasing the gas flow velocity in the smoke guiding channel 2.1 at the connecting wall 2.62, further facilitating the formation and smooth circulation of the heat resistance air flow, and better blocking the heat in the smoke guiding channel 2.1 from overflowing outward.

[0099] In this embodiment, the supplementary air channel 2.12 is configured to extend vertically so that: the air in the external space can flow upward into the smoke guiding channel 2.1 from the supplementary air channel 2.12 in a manner adapted to the upward discharge of the smoke. In this way, the air flow can not only supplement the air as described above and increase the air flow velocity; but also, in some cases, it can form an air curtain that flows upward close to the side wall of the smoke guiding channel 2.1, better blocking the heat in the smoke guiding channel 2.1 from overflowing outward and further improving the heat blocking effect.

[0100] In any of the above solutions, the specific quantity and height position of the air outlet channel 2.4 can be set according to requirements.

[0101] In this embodiment, as a way:

[0102] As shown in the appendix Figure 7As shown, there are at least two air outlet channels 2.4, and the two air outlet channels 2.4 are spaced apart vertically; and, among them: one air outlet channel 2.4 is communicated with the upper end area of the heat insulation cavity 2.2; the other air outlet channel 2.4 is communicated with the lower end area of the heat insulation cavity 2.2. In this way, as shown in the appendix Figure 7 As shown, the air flow flowing into the heat insulation cavity 2.2 from the first air inlet channel 2.3 will be divided into two paths. One path of air flow flows upward in the heat insulation cavity 2.2 and flows into the smoke guiding channel 2.1 through one air outlet channel 2.4 at the upper end; the other path of air flow flows downward in the heat insulation cavity 2.2 and flows into the smoke guiding channel 2.1 through the other air outlet channel 2.4 at the lower end. It can not only form a larger area of heat insulation air flow in the heat insulation cavity 2.2 and improve the heat blocking effect; moreover, by forming two upward and downward air flows in the heat insulation cavity 2.2, while forming a large area of air flow for heat insulation as described above, for each air flow, it has a shorter flow path, enabling the air flow to better and faster bring the heat dissipated to the heat insulation cavity 2.2 back to the smoke guiding channel 2.1, so as to further improve the overall heat blocking effect.

[0103] Among them, for the other air outlet channel 2.4 placed at the lower end, it can be arranged in alignment with the combustion area. That is, the opening at the end of the other air outlet channel 2.4 away from the heat insulation cavity 2.2 is arranged in alignment with the combustion area; so that: the air flow output from the other air outlet channel 2.4 can be delivered to the combustion area of the smoke guiding channel 2.1. In this way, the air with a certain amount of heat in the heat insulation cavity 2.2 can participate in the combustion in the combustion appliance, and can improve the overall combustion efficiency and combustion effect of the combustion appliance.

[0104] At this time, for the setting of the two air outlet channels 2.4, a guiding part 2.6 is arranged corresponding to each air outlet channel 2.4, and each air outlet channel 2.4 is arranged in the backflow wall 2.63 or the connecting wall 2.62 of the guiding part 2.6 that matches it.

[0105] As another way:

[0106] As shown in the appendix Figure 8 and the appendix Figure 9 As shown, the air outlet channel 2.4 is preferably communicated with the upper end area of the heat insulation cavity 2.2, so as to achieve: the air flow can flow into the heat insulation cavity 2.2 from the middle area of the heat insulation cavity 2.2 and flow out from the upper end area of the heat insulation cavity 2.2.

[0107] At this time, in this embodiment, as shown in the appendix Figure 8 and the appendix Figure 9 As shown, a second air inlet channel 2.7 is also arranged in the bottom wall of the heat insulation cavity 2.2 (that is, the cavity wall at the bottom of the heat insulation cavity 2.2). In this way, as shown in the appendix Figure 8As shown, external air flows into the heat insulation chamber 2.2 simultaneously from the first air inlet passage 2.3 and the second air inlet passage 2.7, and together flows upward in the heat insulation chamber 2.2 and then into the smoke guiding passage 2.1, so as to form a heat insulation air flow with a larger area in the heat insulation chamber 2.2 and improve the heat blocking effect.

[0108] Furthermore, that is, the second air inlet passage 2.7 is a vertically penetrating passage provided on the bottom wall of the heat insulation chamber 2.2. The upper end of the passage is connected to the heat insulation chamber 2.2, and the lower end is open, so that: the air in the external space can flow upward into the heat insulation chamber 2.2 from the second air inlet passage 2.7 in a manner adapted to the upward discharge of the smoke. In this way, driven by the upward flow of the high-temperature smoke, the air in the external space of the smoke guiding housing 2 can flow upward into the heat insulation chamber 2.2 more smoothly and flow upward to the air outlet passage 2.4 smoothly, so as to form a continuously flowing heat insulation air flow better and more stably and optimize the heat blocking effect of the overflowing heat.

[0109] In some of the above solutions, for one side wall of the heat insulation chamber 2.2 between the smoke guiding passage 2.1 and the heat insulation chamber 2.2, a plurality of heat guiding portions 2.24 protruding into the heat insulation chamber 2.2 can be provided on this side wall, so as to increase the contact area between the air flow and the side wall of the smoke guiding passage 2.1, and further improve the heat exchange efficiency between the air flow and the side wall of the smoke guiding passage 2.1, so that the air flow flowing through the heat insulation chamber 2.2 can bring more heat back into the smoke guiding passage 2.1.

[0110] In order to improve the overall heat blocking effect, a plurality of heat insulation structures as described above can also be provided around the smoke guiding passage 2.1, and the heat insulation chambers 2.2 in each heat insulation structure are interconnected to form an annular cavity around the outer periphery of the smoke guiding passage 2.1 to block the heat in the smoke guiding housing 2 from overflowing outward in all directions.

[0111] At this time, as shown in the appendix Figure 11 As shown, the smoke guiding housing 2 mainly includes an inner layer housing 2a with a smoke guiding passage 2.1 inside and an outer layer housing arranged around the inner layer housing 2a. A heat insulation chamber 2.2 is formed at intervals between the inner layer housing 2a and the outer layer housing. The outer layer housing includes a first outer layer plate member 2b.1 and a second outer layer plate member 2b.2. The first outer layer plate member 2b.1 and the second outer layer plate member 2b.2 are detachably connected by, for example, screws to form the outer layer housing. Moreover, the first outer layer plate member 2b.1 and the second outer layer plate member 2b.2 are preferably detachably fixedly connected to the inner layer housing 2a by, for example, screws. The air outlet passage 2.4 is provided on the inner layer housing 2a, and the first air inlet passage 2.3 is provided on the outer layer housing.

[0112] Furthermore, on the basis of the above solution provided with the first air inlet passage 2.3 and the second air inlet passage 2.7, as shown in the appendix Figure 12As shown, on at least one side wall of the heat insulation chamber 2.2, there may also be provided: a convex portion that is opposite to the central region of the smoke guiding channel 2.1 (the region where the axis of the smoke guiding channel 2.1 is located, which is often the region where high-temperature flue gas accumulates) in the transverse direction (horizontal direction) and protrudes into the heat insulation chamber 2.2. The provision of this convex portion makes it so that: in the vertical direction, the caliber (the diameter or size of the cavity opening) of the heat insulation chamber 2.2 is arranged in a large, small, large pattern (i.e., a pattern of decreasing first and then increasing); and, a partial region where the caliber of the heat insulation chamber 2.2 decreases is opposite to the central region of the smoke guiding channel 2.1 in the transverse direction.

[0113] For example, as shown in the appendix Figure 12 On one side wall of the heat insulation chamber 2.2 that is close to the smoke guiding channel 2.1 in the transverse direction, there is provided: a first convex portion 2.21 that is opposite to the central region of the smoke guiding channel 2.1 in the transverse direction and protrudes into the heat insulation chamber 2.2; or, on one side wall of the heat insulation chamber 2.2 that is far from the smoke guiding channel 2.1 in the transverse direction, there is provided: a second convex portion 2.22 that is opposite to the central region of the smoke guiding channel 2.1 in the transverse direction and protrudes into the heat insulation chamber 2.2.

[0114] By providing the convex portion, when the air flow in the heat insulation chamber 2.2 flows through the narrow opening region that is opposite to the central region of the smoke guiding channel 2.1 in the transverse direction, the flow rate can be increased to a certain extent. This achieves: not only can the contact area between the air flow and the smoke guiding housing 2 be increased, and the heat transferred to the side wall of the smoke guiding channel 2.1 can be better brought back into the smoke guiding channel 2.1 to optimize the heat insulation effect; but also, according to the working characteristics of the combustion appliance in the gas water heater, in the case of a certain air flow rate, the region where heat is more likely to overflow can have the heat brought back into the smoke guiding channel 2.1 more quickly through a faster air flow; while the region where the heat overflows more slowly can have the heat brought back into the smoke guiding channel 2.1 through a slower and larger air flow rate, stably, slowly and fully transferring heat with the side wall of the smoke guiding channel 2.1, thereby improving the overall heat insulation effect.

[0115] In some solutions, in the direction from bottom to top, the cross-sectional area of the convex portion can gradually increase to better guide the air flow to flow smoothly from bottom to top in the heat insulation chamber 2.2.

[0116] Furthermore, as shown in the appendix Figure 12 On the side wall of the heat insulation chamber 2.2 that faces away from the smoke guiding channel 2.1 (i.e., the side wall of the heat insulation chamber 2.2 that is far from the smoke guiding channel 2.1 in the transverse direction), there is a part that is transversely aligned with the convex portion, and some first air inlet channels 2.3 are provided in this part. When the heat insulation air flow is formed as described above, the external air flow can flow into the heat insulation chamber 2.2 more quickly through the first air inlet channels 2.3, increasing the flow rate of the overall heat insulation air flow, further optimizing and improving the blocking effect on the overflowing heat, and better reducing the surface temperature of the smoke guiding housing 2.

[0117] The above are only the preferred embodiments of the present invention, and do not limit the scope of the present invention. Additionally, in the embodiments of the present invention, the terms "vertical", "horizontal", "front", "rear", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. It should be further noted that unless otherwise clearly specified and defined, terms such as "installation", "connection", "attachment", "fixation", etc. in the description should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0118] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. 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 outwards; A smoke guide housing (2) detachably fixed to the burner (1), wherein the smoke guide housing (2) has a smoke guide channel (2.1) connected to the combustion port (1.11) and discharging smoke generated by combustion upwards, and the lower end opening of the smoke guide channel (2.1) is connected to the combustion port (1.11), so that a combustion zone for flame combustion is formed in the smoke guide channel (2.1); A heat-resistant structure is formed in the side wall of the smoke-guiding channel (2.1), and the heat-resistant structure comprises: A heat-resistant cavity (2.2) arranged in the side wall of the smoke guiding channel (2.1); An air outlet passage (2.4) for connecting the heat-resisting cavity (2.2) with the smoke-guiding passage (2.1); A first air inlet passage (2.3) for connecting the middle area of ​​the heat-resistant cavity (2.2) with the external space of the smoke-guiding shell (2).

2. The combustion device according to claim 1, characterized in that: At least two of the air outlet channels (2.4) are provided, and the two air outlet channels (2.4) are spaced apart in the vertical direction, wherein: One of the air outlet passages (2.4) is in communication with the upper end region of the heat-resistance cavity (2.2); The other air outlet channel (2.4) is connected to the lower end area of ​​the heat-resistance cavity (2.2).

3. The combustion device according to claim 2, characterized in that: The other air outlet channel (2.4) is arranged in alignment with the combustion zone, so that the airflow output from the other air outlet channel (2.4) can be transported to the combustion zone of the smoke guide channel (2.1).

4. The combustion device according to claim 1, characterized in that: The air outlet channel (2.4) is in communication with the upper end region of the heat-resistance cavity (2.2); Furthermore, a second air inlet channel (2.7) is provided in the bottom wall of the heat-resistant cavity (2.2) for connecting the lower end region of the heat-resistant cavity (2.2) with the external space of the smoke-guiding shell (2).

5. The combustion device according to claim 4, characterized in that: The second air inlet hole (2.7) is configured to extend vertically so that the air in the external space can flow upwardly from the second air inlet hole (2.7) into the heat-resistant cavity (2.2) in accordance with the upward discharge of smoke.

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

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

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

9. The combustion device according to claim 8, characterized in that: The side wall of the smoke guiding channel (2.1) is bent to form: a step flow portion (2.11) extending laterally and disposed below the guide portion (2.6); An air supply hole (2.12) is provided in the stepped flow portion (2.11) for allowing air in the external space of the smoke guide housing (2) to enter the smoke guide channel (2.1).

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

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