Combustion appliance and gas water heater with same

Abstract

The invention relates to the technical field of household appliances, in particular to a combustion appliance and a gas water heater with the same, 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 communicated with the combustion port and used for exhausting smoke generated by combustion upwards, and a lower end opening of the smoke guide channel is connected with the combustion port so that a combustion area for flame combustion can be formed in the smoke guide channel. The side wall of the smoke guide channel is provided with an inflow hole channel, a flow guide plate and a flow guide plate, wherein the inflow hole channel allows air in the external space of the smoke guide shell to flow into the smoke guide channel; the smoke guiding channel is provided with a heat resisting plate arranged on the periphery of the combustion area. One end of the flow guide channel is butted and communicated with the flow inlet hole channel, and the other end of the flow guide channel is communicated with the smoke guide channel. The invention relates to a combustion appliance, which is characterized in that heat is prevented 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 specifically to a combustion appliance and a gas water heater having the appliance. Background Art

[0002] A gas energy supply device (gas water heater), as a civil thermal engineering system that converts the chemical energy of gaseous fuel into heat energy and realizes the rapid temperature rise of the circulating water medium through a heat conduction component, its technical architecture is mainly composed of the following core subsystems: a combustion appliance (a functional component that completes the oxidation reaction of fuel to generate high-temperature gaseous working medium), a heat exchanger (transferring energy between exhaust gas and liquid medium through a metal heat-conducting component), a fan system (equipped with a turbocharged gas drive unit), and a supporting fluid circulation pipeline and electronic control unit.

[0003] In the existing engineering technology system, to solve the problem of temperature accumulation generated by the high heat radiation of the combustion appliance on the adjacent circuit unit, mainly two thermal management schemes are adopted: the first type is to set a circulating liquid cooling temperature control mechanism around the combustion chamber, and the second type is to install a mechanical air cooling device on the equipment shell. Through actual engineering verification, both schemes have obvious technical limitations:

[0004] The liquid cooling circulation mechanism needs to lay heat dissipation pipelines with spatial geometric coupling layout on the outer wall of the combustion chamber, resulting in an exponential increase in the complexity of the overall device configuration design and extremely high requirements for assembly accuracy; in order to meet the sealing performance index of the cooling circuit and avoid electrochemical erosion of the flow channel material, it is necessary to use a high-performance corrosion-resistant alloy base material and apply a surface densification treatment process, resulting in a significant increase in material costs; during long-term continuous operation, it is easy to generate crystal phase precipitates of the cooling medium, resulting in a decay of heat conduction efficiency and a shortening of the operation and maintenance cycle.

[0005] The mechanical air cooling scheme requires the addition of an independent turbo air supply device, which not only generates additional hardware purchase costs, but also requires the design of a dedicated air duct and a supporting power control system, resulting in a simultaneous deterioration of the internal space arrangement efficiency and the complexity of electrical circuits of the equipment.

[0006] The above analysis shows that traditional liquid cooling and air cooling technologies have significant technical defects in terms of system structure complexity, manufacturing cost control, and economic indicators. Summary of the Invention

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

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

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

[0010] Burning appliances, including:

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

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

[0013] The side wall of the smoke guide channel is provided with: an inlet hole for air in the external space of the smoke guide housing to flow into the smoke guide channel;

[0014] The smoke guide channel also has: a heat-blocking plate disposed on the periphery of the combustion zone;

[0015] The heat-resisting plate is provided with a flow guiding channel, one end of which is butted against and communicated with the flow inlet channel, and the other end of which is openly communicated with the smoke guiding channel.

[0016] In some embodiments, a heat-resistant structure is further formed in the side wall of the smoke-guiding channel, and the heat-resistant structure includes:

[0017] A heat-resistant cavity disposed in the side wall of the smoke-conducting passage;

[0018] An air outlet passage connecting the heat-blocking cavity and the smoke-conducting passage;

[0019] An air inlet passage connecting the heat-blocking cavity and the external space of the smoke-conducting shell.

[0020] In some embodiments, the air outlet channel is connected to the upper end region of the heat-resistance cavity, and the air inlet channel is connected to the lower end region of the heat-resistance cavity.

[0021] In some embodiments, the air inlet duct is disposed in the bottom wall of the heat-resistant cavity and is configured to extend vertically so that air from the external space can flow upward into the heat-resistant cavity through the air inlet duct in accordance with the upward discharge of smoke.

[0022] In some schemes, a side wall of the heat-resistance cavity disposed between the smoke-guiding channel and the heat-resistance cavity is provided with: a plurality of heat-introducing portions protruding into the heat-resistance cavity.

[0023] In some embodiments, a plurality of heat-resistant structures are arranged around the smoke-guiding channel, and the heat-resistant cavities in the respective heat-resistant structures are interconnected to form an annular cavity around the outer periphery of the smoke-guiding channel.

[0024] In some schemes, the side wall of the smoke guiding channel is bent to form: a step flow portion extending laterally and located below the heat-resisting plate;

[0025] The inlet flow channel is arranged in the stepped flow part, and the heat insulation plate is placed on the stepped flow part.

[0026] In some solutions, a diversion part that protrudes into the smoke guide channel and is located above the heat insulation plate is arranged on the side wall of the smoke guide channel;

[0027] The inside of the diversion part is arranged as a cavity and is communicated with the heat insulation cavity;

[0028] Moreover, the outer wall of the diversion part includes:

[0029] A diversion wall facing the combustion port, which is inclined to guide the airflow flowing upward from the side wall of the smoke guide channel to the center of the smoke guide channel;

[0030] A backflow wall facing away from the combustion port;

[0031] And a connecting wall that extends vertically and connects the diversion wall and the backflow wall;

[0032] The air outlet channel is arranged on the backflow wall.

[0033] In some solutions, a diversion part that protrudes into the smoke guide channel and is located above the heat insulation plate is arranged on the side wall of the smoke guide channel;

[0034] The inside of the diversion part is arranged as a cavity and is communicated with the heat insulation cavity;

[0035] Moreover, the outer wall of the diversion part includes:

[0036] A diversion wall facing the combustion port, which is inclined to guide the airflow at the side wall of the smoke guide channel to the center of the smoke guide channel;

[0037] A backflow wall facing away from the combustion port;

[0038] And a connecting wall that extends vertically and connects the diversion wall and the backflow wall;

[0039] The air outlet channel is arranged on the connecting wall.

[0040] The gas water heater includes the combustion appliance described in any of the above solutions.

[0041] The main beneficial effects of the above technical solutions are as follows:

[0042] 1. By setting the heat insulation plate, partition plus air-cooled heat insulation can be formed, and the heat dissipated from the smoke guide channel to the surface of the smoke guide shell can be brought back into the smoke guide channel, which can not only block the heat generated by the flame combustion in the smoke guide shell from overflowing outward, but also effectively control the surface temperature of the combustion appliance.

[0043] 2. The overall heat insulation structure is simpler and can better reduce the production cost.

[0044] 3. In addition to forming air-cooled heat insulation, the heat-blocking air flow can also bring back the dissipated heat to the smoke guide channel for heat exchange with the heat exchanger, improving the overall effective heat output rate of the combustion appliance and forming a high-efficiency gas combustion structure.

[0045] 4. By forming a heat-blocking plate with a diversion channel, 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.

[0046] 5. On the basis of the heat-blocking plate, a heat-blocking structure is additionally provided, which can further form multiple layers of heat-blocking air flows to further improve the blocking effect on the overflowing heat and the overall effective heat output rate of the combustion appliance.

[0047] 6. By setting the diversion part, on the one hand, the air flow (such as air, gas, and high-temperature flue gas) can be better gathered at the center of the smoke guide channel 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 in the follow-up; on the other hand, the air flow can be synchronously driven away from the side wall of the smoke guide channel to further weaken the effect of heat transfer to the outside.

[0048] 7. By connecting the air inlet channel and the air outlet channel, a large-area air flow can be formed in the heat-blocking cavity, and then a larger heat-blocking area can be formed to improve the blocking effect on the overflowing heat.

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

[0050] The following is a further description of the present invention with reference to the drawings:

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

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

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

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

[0055] Figure 5 It is a schematic cross-sectional view of the smoke guide housing.

[0056] Figure 6 It is an enlarged schematic diagram of the air outlet channel.

[0057] Figure 7This is an enlarged schematic diagram of the air intake duct.

[0058] Figure 8 This is a schematic diagram of the installation structure of the smoke guide housing.

[0059] Figure 9 A schematic diagram of an installation structure of a smoke guide housing when a protrusion is formed in the heat-resistant cavity.

[0060] Figure 10 It is a cross-sectional schematic diagram of the smoke guide housing when a flow diversion portion and a flow supplement channel are provided. DETAILED DESCRIPTION

[0061] The present invention is specifically described below with reference to the embodiments:

[0062] Example:

[0063] Gas water heater, such as Figure 1 As shown, it mainly includes a water heater shell and a number of functional components placed in 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 and used to transfer the high temperature to the cold water in the water pipe, and a fan assembly 4 for forming a directional airflow.

[0064] Specifically, for example Figure 1 As 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.

[0065] 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.).

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] During operation, the gas is transported from the gas channel inside the fire grate 1.2 to the combustion port 1.11, the air flows from the air intake channel 1.12 to the combustion port 1.11, and the ignition device 1.3 is controlled to open for ignition, so that the gas at the combustion port 1.11 of the burner 1 is ignited to form a combustion flame that surges upward, and the combustion flame surges into the smoke guide channel 2.1 to burn, so that a combustion area for flame combustion is formed in the smoke guide channel 2.1. At this time, the smoke and heat generated by the combustion enter the smoke guide channel 2.1 and flow upward under the guidance of the smoke guide channel 2.1.

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

[0072] Specifically, Figure 4 As an example, the heat exchanger 3 includes a heat exchange housing 3.1, which can be detachably connected to the smoke guide housing 2 or to other external support structures, such as the water heater housing, by means of screws. The heat exchange housing 3.1 has heat exchange channels 3.11 (see FIG. 1 ) with two ends connected. Figure 3 As shown in the figure, the heat exchange channel 3.11 is a through hole arranged in the vertical direction); the lower end of the heat exchange channel 3.11 is connected with and communicated with the upper end opening of the smoke guide channel 2.1, so that the high-temperature flue gas generated by the combustion in the smoke guide channel 2.1 can flow upward into the heat exchange channel 3.11.

[0073] Meanwhile, the heat exchanger 3 further includes a heat exchange pipe 3.2. One end of the heat exchange pipe 3.2 has a water inlet for water intake, and the other end has a water outlet for water discharge. The heat exchange pipe 3.2 is connected to the heat exchange housing 3.1 and has a part disposed in the heat exchange channel 3.11. It is realized that when combustion is carried out as described above to form a flame and high-temperature flue gas, the high-temperature flue gas flows into the heat exchange channel 3.11 to transfer heat to the part of the heat exchange pipe 3.2 disposed in the heat exchange channel 3.11. At the same time, cold water is conveyed through, for example, a water pipe into the water inlet of the heat exchange pipe 3.2. The cold water is heated after flowing through the part of the heat exchange pipe 3.2 disposed in the heat exchange channel 3.11 and then hot water is output from the water outlet for use.

[0074] In some cases, a number of heat exchange fins 3.3 (the heat exchange fins 3.3 are sheet-like structures made of materials with good thermal conductivity such as steel strips, stainless steel strips, copper strips, and aluminum strips) can also be provided in the heat exchange channel 3.11. The heat exchange fins 3.3 have parts that fit with the heat exchange pipe 3.2 to increase the heat exchange contact area with the high-temperature flue gas and transfer the heat in the high-temperature flue gas to the heat exchange pipe 3.2 better and over a larger area, so as to further improve the heat exchange effect on the cold water in the heat exchange pipe 3.2.

[0075] The fan assembly 4 is a fan structure used in a gas water heater to form an air flow, and it is configured to form an air flow that drives the flue gas to flow from the smoke guide 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 and placed at the upper end opening of the heat exchange channel 3.11, and it is configured to suck the flue gas in the smoke guide channel 2.1 to drive the flue gas to flow from the smoke guide channel 2.1 into the heat exchange channel 3.11. At this time, the fan assembly 4 is also provided with a smoke exhaust pipe for discharging the sucked flue gas in a directional manner, and the smoke exhaust pipe is used to communicate with a smoke outlet in a building to discharge the flue gas in a directional manner.

[0077] The fan assembly 4 can also be connected to the burner 1 and placed at the lower end opening of the air intake channel 1.12, and it is configured to blow the flue gas in the smoke guide channel 2.1 upward to drive the flue gas to flow from the smoke guide channel 2.1 into the heat exchange channel 3.11. At this time, the upper end opening of the heat exchange channel 3.11 is used to communicate with a smoke outlet in a building.

[0078] In summary, the combustion device, the heat exchanger 3 and the fan assembly 4 together constitute the main components of the gas water heater. In addition, the gas water heater also includes a number of electrical components arranged outside the combustion device. When the combustion device is burning as described above, the high temperature heat inside the smoke guide housing 2 is easy to overflow, which will not only drive the surface temperature of the smoke guide housing 2 to be too high, affecting the service life of the smoke guide housing 2, but also have an adverse effect on the electrical components outside the combustion device. In severe cases, the service life of the gas water heater will be greatly reduced.

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

[0080] As a form, a water cooling structure can be provided on the outer surface of the smoke guide housing 2 to solve the above problem. However, the water cooling structure often requires a complex pipeline structure, resulting in a complex pipeline structure and difficult installation of the combustion apparatus; moreover, in order to better prevent water leakage and water corrosion, the water cooling pipeline structure often requires a large cost.

[0081] In order to solve the above problems, simplify the structure and reduce the cost, the present application proposes: combining the combustion characteristics of gas, using a simple structure to block the heat from escaping and having a higher economic efficiency, and also proposes a gas water heater with the combustion device.

[0082] For example, Figure 5 As shown, the side wall of the smoke guide channel 2.1 (e.g., the step portion 2.11 hereinafter) may be provided with: an inlet hole 2.12 for the air in the external space of the smoke guide housing 2 to flow into the smoke guide channel 2.1. At the same time, the smoke guide channel 2.1 may also have: a heat-resisting plate 5 disposed at the periphery of the combustion zone; for example, Figure 5 As shown, the heat-blocking plate 5 is placed at the edge of the smoke-guiding channel 2.1 to avoid affecting the flame formation and the upward flow of smoke in the combustion zone; and the heat-blocking plate 5 can be attached to the side wall of the smoke-guiding channel 2.1, and can be detachably fixed to the smoke-guiding housing 2 by a detachable connection structure such as a screw or a snap structure, so as to improve the stability of the installation of the heat-blocking plate 5. The heat-blocking plate 5 has a guide channel 5.1, one end of which (for example, attached) Figure 5 The lower end of the middle flow guide channel 5.1) is connected to the inlet channel 2.12 and communicates with each other, and the other end (for example, the attached Figure 5 The upper end of the middle flow guiding channel 5.1 is open and communicated with the smoke guiding channel 2.1, so that the air in the external space of the smoke guiding housing 2 can flow into the smoke guiding channel 2.1 through the inlet hole 2.12 and the flow guiding channel 5.1.

[0083] When a flame forms in the combustion zone of the smoke guide channel 2.1, it consumes oxygen and fuel gas and forms high-temperature flue gas that rises directly, creating a low-pressure area in the smoke guide channel 2.1. Under the action of the low-pressure area and the external air pressure, the external air forms an air flow that enters the diversion channel 5.1 from the inlet channel 2.12 and then flows into the smoke guide channel 2.1 from the diversion channel 5.1, which is called the first heat-resistant air flow. This first heat-resistant air flow forms air-cooled heat insulation, which can bring back the heat dissipated from the surface of the smoke guide housing 2 to the smoke guide channel 2.1. It can not only block the heat formed by the flame combustion in the smoke guide housing 2 from overflowing outward, effectively control the surface temperature of the combustion appliance, but also bring back the dissipated heat to the smoke guide 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-mentioned heat-resistant plate 5 and the inlet channel 2.12 are arranged without the need to additionally set up a complex water pipe structure, with a simpler and easier-to-install structure, and without the 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.

[0084] Among them, the above-mentioned heat-resistant plate 5 is preferably made of materials with good heat insulation performance such as ceramic fiber, rather than being limited to the metal materials that make up the smoke guide housing 2, so as to better improve the blocking effect on the overflowing heat and reduce the outer surface temperature of the smoke guide housing 2.

[0085] Further, as shown in the appendix Figure 5 and the appendix Figure 7 As shown, the side wall part of the smoke guide channel 2.1 can also be bent to form a stepped flow part 2.11 that extends horizontally and is located below the heat-resistant plate 5. The stepped flow part 2.11 is provided with an inlet channel 2.12, and the inlet channel 2.12 is a channel arranged in the stepped flow part 2.11. The upper end of the channel is connected to the diversion channel 5.1 and the lower end is open, so that the air in the external space of the smoke guide housing 2 can enter the smoke guide channel 2.1 through the inlet channel 2.12 and the diversion channel 5.1.

[0086] And the heat-resistant plate 5 can be placed on the stepped flow part 2.11 so that the stepped flow part 2.11 can provide support for the heat-resistant plate 5, and the heat-resistant plate 5 can support the formation of the above-mentioned first heat-resistant air flow in a more stable state.

[0087] In this embodiment, the diversion channel 5.1 is configured to extend vertically, and the inlet channel 2.12 is also configured to extend vertically, so that the air in the external space can flow upward into the diversion channel 5.1 from the inlet channel 2.12 in adaptation to the upward discharge of the flue gas, further optimizing the smoothness of the flow of the first heat-resistant air flow.

[0088] In order to better improve the heat insulation effect, as an example, as shown in the appendix Figure 3 and the appendixFigure 5 As 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.

[0089] Specifically, the heat insulation structure includes a heat insulation cavity 2.2, an air outlet channel 2.4, and an air inlet channel 2.3. More precisely, for example, as shown in the attached Figure 3 and the attached Figure 5 As shown, the heat insulation cavity 2.2 is a cavity formed in the side wall of the smoke guiding channel 2.1; the air outlet channel 2.4 is a hole formed 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 air inlet channel 2.3 can be a hole formed in the side wall of the heat insulation cavity 2.2 that is laterally far from the smoke guiding channel 2.1 or in the bottom wall of the heat insulation cavity 2.2 and allows the heat insulation cavity 2.2 to communicate with the external air.

[0090] When a flame is formed in the combustion zone of the smoke guiding channel 2.1, oxygen and fuel gas are consumed, and high-temperature smoke 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 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. As a result, a flowing air current (as shown by the arrows in the attached Figure 5 ) can be formed in the heat insulation cavity 2.2, which is called the second heat insulation air current; this second heat insulation air current also forms air-cooled heat insulation, which can bring back the heat dissipated from the surface of the smoke guiding housing 2 to the smoke guiding channel 2.1.

[0091] The first heat insulation air current and the second heat insulation air current can jointly form a multi-layer heat insulation air current to further improve the blocking effect on the overflowing heat and the overall effective heat output rate of the combustion appliance.

[0092] Among them, the specific positions of the air inlet channel 2.3 and the air outlet channel 2.4 can be set according to requirements.

[0093] In this embodiment, as a form: the air inlet channel 2.3 communicates with the lower region of the heat insulation cavity 2.2, and the air outlet channel 2.4 communicates with the upper region of the heat insulation cavity 2.2. (In the vertical direction, by dividing the heat insulation cavity 2.2 into three equal parts, the heat insulation cavity 2.2 is sequentially divided from top to bottom into: an upper region, a middle region, and a lower region.) This can form a larger area of air current in the heat insulation cavity 2.2, thereby forming a larger heat blocking area and improving the blocking effect on the overflowing heat.

[0094] Furthermore, in this embodiment, as shown in the attached Figure 5 and the attached Figure 7As shown in the figure, the intake air passage 2.3 is arranged in the bottom wall of the heat insulation cavity 2.2 (i.e., the cavity wall at the bottom of the heat insulation cavity 2.2), and is configured to extend vertically. That is, the intake air passage 2.3 is a vertically penetrating passage arranged in the bottom wall of the heat insulation cavity 2.2. The upper end of this passage is connected to the heat insulation cavity 2.2, and the lower end is open, so that: the air in the external space can flow upward into the heat insulation cavity 2.2 from the intake air passage 2.3 in a manner adapted to the upward discharge of the flue gas. In this way, driven by the upward flow of the high-temperature flue gas, the air in the external space of the smoke guide housing 2 can flow upward into the heat insulation cavity 2.2 more smoothly, and flow upward to the air outlet passage 2.4 smoothly, so as to better and more stably form a continuously flowing second heat insulation air flow, optimizing the blocking effect of the overflow heat.

[0095] In any of the above solutions, as shown in the attached Figure 6 figure, a flow guiding portion 2.6 that protrudes into the smoke guide passage 2.1 and is located above the heat insulation plate 5 can also be provided on the side wall of the smoke guide passage 2.1.

[0096] Specifically, the inside of the flow guiding portion 2.6 is provided with a cavity and is connected to the heat insulation cavity 2.2; moreover, the outer wall of the flow guiding portion 2.6 (i.e., the side wall on the outer surface of the protrusion of the flow guiding portion 2.6 for contacting the air flow in the smoke guide passage 2.1) includes: a flow guiding wall 2.61 facing the combustion port 1.11 (i.e., facing the air flow after the air flow is output from the combustion port 1.11), a back flow wall 2.63 facing away from the combustion port 1.11 (i.e., facing away from the air flow after the air flow is output from the combustion port 1.11), and a connecting wall 2.62 that extends vertically (vertically or arcuately) and connects the flow guiding wall 2.61 and the back flow wall 2.63. That is, the upper end of the connecting wall 2.62 is connected to the back flow wall 2.63, and the lower end is connected to the flow guiding wall 2.61 to connect the flow guiding wall 2.61 and the back flow wall 2.63. For example, as shown in the attached Figure 6 figure, the outer wall of the flow guiding portion 2.6 includes: a flow guiding wall 2.61 facing downward, a back flow wall 2.63 facing upward, and a connecting wall 2.62 that extends arcuately vertically.

[0097] Among them, the flow guiding wall 2.61 is inclined to be able to guide the air flow flowing upward from the side wall of the smoke guide passage 2.1 to the center of the smoke guide passage 2.1 (the area where the axis of the smoke guide passage 2.1 is located). In this way, on the one hand, the air flow (air, gas, high-temperature flue gas, etc.) can be better aggregated at the center of the smoke guide passage 2.1 to improve the combustion efficiency and heat concentration rate, and then the heat can be better concentrated and output, facilitating better utilization of the heat subsequently; on the other hand, it can synchronously drive the air flow away from the side wall of the smoke guide passage 2.1 to further weaken the effect of heat transfer to the outside.

[0098] At this time, as a way, the air outlet passage 2.4 can be arranged on the backflow wall 2.63.

[0099] Alternatively, as another way, the air outlet passage 2.4 is arranged on the connecting wall 2.62; and the air outlet passage 2.4 is preferably arranged to extend obliquely, so that after the air flow in the heat blocking cavity 2.2 flows out from the air outlet passage 2.4, it can be conveyed obliquely upward. Realize that the air flow flowing out from the air outlet passage 2.4 into the smoke guiding passage 2.1 can better conform to the flow of the rising smoke in the smoke guiding passage 2.1, reduce the unnecessary air flow impact, and at the same time improve the smoothness and stability of the rising flow of the smoke and the rising flow of the second heat blocking air flow, thereby improving the stability of the heat output of the combustion appliance while optimizing the blocking effect of the overflow heat.

[0100] Regardless of the above-mentioned method, the air flow formed by combustion in the smoke guiding passage 2.1 is not likely to have an unnecessary obstructive effect on the air flow in the heat blocking cavity 2.2, so that the second heat blocking air flow for heat blocking as described above can always be smoothly formed in the heat blocking cavity 2.2.

[0101] Moreover, when the air outlet passage 2.4 is arranged on the connecting wall 2.62, due to the guiding effect of the air guiding wall 2.61 on the air flow, it will drive the diameter of the smoke guiding passage 2.1 at the connecting wall 2.62 to decrease, and the flow rate will increase and the fluid pressure will decrease in this area; thus, it can better attract the air flow in the heat blocking cavity 2.2, and further improve the smoothness of the formation and circulation of the second heat blocking air flow (the air flow of the external air entering the heat blocking cavity 2.2 from the air inlet passage 2.3 and then flowing out from the air outlet passage 2.4 into the smoke guiding passage 2.1), so as to improve the overall blocking effect of the overflow heat and better reduce the surface temperature of the smoke guiding housing 2.

[0102] In some solutions, for one side wall of the heat blocking cavity 2.2 located between the smoke guiding passage 2.1 and the heat blocking cavity 2.2, a number of heat guiding parts 2.24 protruding into the heat blocking cavity 2.2 can be arranged 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 then 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 blocking cavity 2.2 can bring more heat back into the smoke guiding passage 2.1.

[0103] In order to improve the overall heat blocking effect, a plurality of the above-mentioned heat blocking structures can also be arranged around the smoke guiding passage 2.1, and the heat blocking cavities 2.2 in each heat blocking structure are interconnected to form an annular cavity surrounding the outer periphery of the smoke guiding passage 2.1, so as to block the heat in the smoke guiding housing 2 from overflowing outward in 360 degrees.

[0104] At this time, as shown in the appendix Figure 9As shown, the smoke guide housing 2 mainly consists of an inner layer housing 2a with a smoke guide channel 2.1 inside, and an outer layer housing arranged around the inner layer housing 2a. A heat insulation cavity 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 panel member 2b.1 and a second outer panel member 2b.2. The first outer panel member 2b.1 and the second outer panel member 2b.2 are detachably connected by, for example, screws to form the outer layer housing. Moreover, both the first outer panel member 2b.1 and the second outer panel member 2b.2 are preferably detachably and fixedly connected to the inner layer housing 2a by, for example, screws. An air outlet channel 2.4 is provided in the inner layer housing 2a, and an air inlet channel 2.3 is provided in the outer layer housing.

[0105] Based on any of the above solutions, on at least one side wall of the heat insulation cavity 2.2, there may also be provided a diversion portion that protrudes into the heat insulation cavity 2.2 and is opposite to the central region of the smoke guide channel 2.1 (the region where the axis of the smoke guide channel 2.1 is located, which is often also the region where high-temperature flue gas accumulates) in the transverse (horizontal) direction. This diversion portion makes the heat insulation cavity 2.2 have a narrow mouth area with a reduced diameter in, for example, the central region of the heat insulation cavity 2.2. For example, the setting of this diversion portion makes the diameter (the diameter or size of the cavity opening) of the heat insulation cavity 2.2 arranged in a large, small, large pattern (i.e., a pattern of first decreasing and then increasing) in the vertical direction; and, the partial area (narrow mouth area) where the diameter of the heat insulation cavity 2.2 decreases is opposite to the central region of the smoke guide channel 2.1 in the transverse direction.

[0106] For example, as shown in the appendix Figure 9 On one side wall of the heat insulation cavity 2.2 that is close to the smoke guide channel 2.1 in the transverse direction, there is provided a first diversion portion 2.21 that is opposite to the central region of the smoke guide channel 2.1 in the transverse direction and protrudes into the heat insulation cavity 2.2; or, on one side wall of the heat insulation cavity 2.2 that is far from the smoke guide channel 2.1 in the transverse direction, there is provided a second diversion portion 2.22 that is opposite to the central region of the smoke guide channel 2.1 in the transverse direction and protrudes into the heat insulation cavity 2.2.

[0107] By setting the diversion portion, when the air flow in the heat insulation cavity 2.2 flows through the narrow mouth area that is opposite to the central region of the smoke guide channel 2.1 in the transverse direction, the flow rate can be increased to a certain extent. It can be achieved that not only the contact area between the air flow and the smoke guide housing 2 can be increased, and the heat transferred to the side wall of the smoke guide channel 2.1 can be better brought back into the smoke guide 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 area where heat is more likely to overflow can have a faster air flow to bring the heat back into the smoke guide channel 2.1 more quickly; while the area where the heat overflows more slowly has a slower and larger air flow rate to stably, slowly and fully transfer heat with the side wall of the smoke guide channel 2.1 and bring the heat back into the smoke guide channel 2.1, thereby improving the overall heat insulation effect.

[0108] In some embodiments, in the direction from bottom to top, the cross-sectional area of the flow splitting portion can gradually increase, so as to better guide the airflow to flow smoothly from bottom to top in the heat insulation cavity 2.2.

[0109] Further, as shown in the attached Figure 10 figure, a side wall of the heat insulation cavity 2.2 facing away from the smoke guiding channel 2.1 (i.e., the side wall of the heat insulation cavity 2.2 that is laterally far from the smoke guiding channel 2.1) has a portion that is laterally aligned with the flow splitting portion, and a supplementary flow hole 2.23 for the air in the external space of the smoke guiding housing 2 to flow into the narrow port area of the heat insulation cavity 2.2 can be provided in this portion. When the second heat insulation airflow is formed as described above, the external airflow can flow into the heat insulation cavity 2.2 more quickly through the supplementary flow hole 2.23, increasing the flow rate of the overall second heat insulation airflow, further optimizing and improving the blocking effect on the overflow heat, and better reducing the surface temperature of the smoke guiding housing 2.

[0110] The above are only the preferred embodiments of the present invention, and do not limit the scope of the present invention. Additionally, in the embodiments of the present invention, the terms "vertical", "horizontal", "front", "rear", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product is usually placed during use. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. It should be further noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", "fixation", etc. in the description should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or the 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.

[0111] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present invention. 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); The side wall of the smoke guide channel (2.1) is provided with: an inlet hole (2.12) for air in the external space of the smoke guide housing (2) to flow into the smoke guide channel (2.1); The smoke guiding channel (2.1) further comprises: a heat-blocking plate (5) disposed at the periphery of the combustion zone; The heat-resisting plate (5) has a flow guide channel (5.1), one end of which is butted against and connected to the flow inlet channel (2.12), and the other end of which is open and connected to the smoke guide channel (2.1).

2. The combustion device according to claim 1, characterized in that: A heat-resistant structure is also formed in the side wall of the smoke-guiding channel (2.1), and the heat-resistant structure comprises: A heat-resistant cavity (2.2) arranged in the side wall of the smoke guiding channel (2.1); An air outlet passage (2.4) for connecting the heat-resisting cavity (2.2) with the smoke-guiding passage (2.1); An air intake passage (2.3) for connecting the heat-resisting cavity (2.2) with the external space of the smoke-guiding shell (2).

3. The combustion device according to claim 2, characterized in that: The air outlet channel (2.4) is connected to the upper end region of the heat-resistance cavity (2.2), and the air inlet channel (2.3) is connected to the lower end region of the heat-resistance cavity (2.2).

4. The combustion device according to claim 3, characterized in that: The air inlet duct (2.3) is arranged in the bottom wall of the heat-resistant cavity (2.2) and is configured to extend vertically so that air in the external space can flow upwardly into the heat-resistant cavity (2.2) from the air inlet duct (2.3) in accordance with the upward discharge of smoke.

5. The combustion device according to claim 2, characterized in that: A side wall of the heat-resistance cavity (2.2) disposed between the smoke-guiding channel (2.1) and the heat-resistance cavity (2.2) is provided with a plurality of heat-introducing portions (2.24) protruding into the heat-resistance cavity (2.2).

6. The combustion device according to claim 2, 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 bent to form: a step flow portion (2.11) extending laterally and located below the heat-resisting plate (5); The inlet channel (2.12) is arranged in the step portion (2.11), and the heat resistance plate (5) is placed on the step portion (2.11).

8. The burner according to any one of claims 2 to 6, characterized in that: The side wall of the smoke guiding channel (2.1) is provided with: a flow guiding portion (2.6) protruding into the smoke guiding channel (2.1) and located above the heat-resisting plate (5); The interior of the flow guide (2.6) is arranged as a cavity and is connected to the heat-resistance cavity (2.2); Furthermore, the outer wall of the guide portion (2.6) comprises: A flow guide wall (2.61) facing the combustion port (1.11) is arranged in an inclined manner so as to guide the airflow flowing upward from the side wall of the smoke guide channel (2.1) to the center of the smoke guide channel (2.1); A back flow wall (2.63) facing away from the combustion port (1.11); and a connecting wall (2.62) extending in the vertical direction and connecting the flow guide wall (2.61) and the back flow wall (2.63); The air outlet channel (2.4) is arranged on the back flow wall (2.63).

9. The burner according to any one of claims 2 to 6, characterized in that: The side wall of the smoke guiding channel (2.1) is provided with: a flow guiding portion (2.6) protruding into the smoke guiding channel (2.1) and located above the heat-resisting plate (5); The interior of the flow guide (2.6) is arranged as a cavity and is connected to the heat-resistance cavity (2.2); Furthermore, the outer wall of the guide portion (2.6) comprises: A flow guide wall (2.61) facing the combustion port (1.11) is arranged at an angle so as to guide the airflow at the side wall of the smoke guide channel (2.1) to the center of the smoke guide channel (2.1); A back flow wall (2.63) facing away from the combustion port (1.11); and a connecting wall (2.62) extending in the vertical direction and connecting the flow guide wall (2.61) and the back flow wall (2.63); The air outlet channel (2.4) is arranged on the connecting wall (2.62).

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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