Combustion device and gas water heater

Abstract

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

Description

Technical Field

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

[0002] A gas water heater is based on the principle of energy release by gas combustion, and realizes rapid heating of a liquid working medium through a heat exchange device. Its core architecture includes the following functional modules: a combustion device (high-temperature flame generation unit), a heat exchanger (gas-water heat transfer pipeline system), a fan system (including a turbine fan unit), and supporting pipelines and an electronic control unit.

[0003] In the existing technical system, in order to eliminate the thermal radiation influence of the high temperature of the combustion device on the surrounding electronic devices, two thermal management solutions are generally adopted: Solution 1 constructs a circulating cooling water network on the combustion chamber housing, and Solution 2 configures a forced convection heat dissipation component outside the device. Engineering practice verification shows that:

[0004] For the water circulation cooling solution, its cooling pipelines need to be arranged in a three-dimensional staggered manner with the combustion chamber, resulting in an increase in the assembly process difficulty of the components; in order to prevent leakage of the cooling medium and oxidation corrosion of the metal pipelines, high-precision sealing pipes must be used and a surface passivation treatment process must be performed, resulting in a significant increase in material costs; there is a risk of scaling during the continuous operation of the device, resulting in a decrease in heat conduction efficiency and an increase in maintenance costs.

[0005] For the forced convection heat dissipation solution, since an additional heat dissipation fan component needs to be configured, it not only increases the procurement cost of accessories, but also needs to construct a dedicated air flow channel and an independent power supply system, resulting in a significant increase in the complexity of the overall machine structure layout.

[0006] Technical evaluation shows that both of the current two mainstream heat dissipation technology solutions have systematic defects such as too high process costs and poor economy. 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 device that can block heat from dissipating outward through a simple structure and has higher economy in combination with the gas combustion characteristics.

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

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

[0010] A combustion device, 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 provided in the side wall of the smoke guide passage;

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

[0016] An air inlet passage for communicating the lower end area of the heat insulation cavity with the external space of the smoke guide housing.

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

[0018] In some solutions, the air inlet passage is provided in the bottom wall of the heat insulation cavity and is configured to extend vertically so that: the air in the external space can flow upward into the heat insulation cavity from the air inlet passage in a manner adapted to the upward discharge of the smoke.

[0019] In some solutions, the heat insulation cavity has a side wall disposed between the smoke guide passage and the heat insulation cavity, and the side wall has: a plurality of heat guiding portions protruding into the heat insulation cavity.

[0020] In some solutions, a plurality of heat insulation structures are provided 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.

[0021] In some solutions, the side wall of the smoke guide passage is provided with: a flow guiding portion protruding into the smoke guide passage;

[0022] The inside of the flow guiding portion is provided as a cavity and communicates with the heat insulation cavity;

[0023] Moreover, the outer wall of the flow guiding portion includes:

[0024] A drainage wall facing the combustion port, which is inclined to guide the airflow flowing upward from the side wall of the smoke guide passage to the center of the smoke guide passage;

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

[0026] And a connecting wall extending vertically and connecting the drainage wall and the backflow wall;

[0027] The air outlet passage is provided in the backflow wall.

[0028] In some solutions, the side wall of the smoke guide passage is provided with: a flow guiding portion protruding into the smoke guide passage;

[0029] The inside of the diversion part is arranged as a cavity and is communicated with the heat insulation cavity;

[0030] Moreover, the outer wall of the diversion part includes:

[0031] A diversion wall facing the combustion port, which is inclined so as to guide the airflow at the side wall of the smoke guide channel to the center of the smoke guide channel;

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

[0033] And a connecting wall that extends vertically and connects the diversion wall and the backflow wall;

[0034] The air outlet channel is arranged on the connecting wall.

[0035] In some solutions, the side wall of the smoke guide channel is bent to form a stepped flow part that extends horizontally and is located below the diversion part;

[0036] The stepped flow part is provided with a supplementary air hole channel for air in the external space of the smoke guide housing to enter the smoke guide channel.

[0037] In some solutions, the supplementary air hole channel is configured to extend vertically so that: the air in the external space can flow upward into the smoke guide channel from the supplementary air hole channel in a manner adapted to the upward discharge of the smoke.

[0038] The gas water heater includes the combustion device described in any of the above solutions.

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

[0040] 1. By providing a heat insulation structure in the side wall of the smoke guide channel in the smoke guide housing, which can use cold air as a heat insulation medium, 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 device.

[0041] 2. The overall heat insulation structure is simpler, and the production cost can be better reduced.

[0042] 3. In addition to forming air-cooled heat insulation, the heat insulation airflow can also bring the dissipated heat back into the smoke guide channel for heat exchange with the heat exchanger, improving the overall effective heat output rate of the combustion device to form a high-efficiency gas combustion structure.

[0043] 4. By forming a heat insulation structure, when the combustion device 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.

[0044] 5. Connect the air outlet channel to the upper region of the heat insulation chamber, so as to achieve that the air flow can flow into the heat insulation chamber from the lower region of the heat insulation chamber and flow out from the upper region of the heat insulation chamber, so as to form a larger area of air flow in the heat insulation chamber, and then form a larger heat blocking area, improving the blocking effect on the overflow heat.

[0045] 6. By setting the diversion part, on the one hand, it can better gather the air flow (such as air, gas and high-temperature flue gas, etc.) at the center of the smoke guiding channel, so as to improve the combustion efficiency and heat concentration rate, and then can better gather and output heat, facilitating 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 guiding channel, further weakening the effect of heat transfer to the outside.

[0046] 7. Further set the air outlet channel on the connecting wall, which can better attract the air flow in the heat insulation chamber, further improve the smoothness of the heat insulation air flow, so as to overall improve the blocking effect on the overflow heat and better reduce the surface temperature of the smoke guiding shell.

[0047] 8. By setting the air supplement channel, on the one hand, it can further increase the intake of air, so that the gas can burn more fully; on the other hand, combined with the setting of the above-mentioned diversion part, under the same other settings, increasing the air supplement channel can increase the overall intake air volume, and then can better increase the gas flow rate in the smoke guiding channel at the connecting wall, further providing assistance for the formation and smoothness of the heat insulation air flow, so as to better block the heat in the smoke guiding channel from overflowing to the outside.

[0048] Further or more detailed beneficial effects will be described in combination with specific embodiments in the specific implementation manner. Brief Description of the Drawings

[0049] The following further describes the present invention with reference to the drawings:

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

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

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

[0053] Figure 4 It is a schematic diagram of the structure of the heat exchanger.

[0054] Figure 5 It is a schematic cross-sectional view of the smoke guiding shell.

[0055] Figure 6 It is an enlarged schematic diagram of the air outlet channel.

[0056] Figure 7 Schematic diagram of enlarged intake air passage

[0057] Figure 8 Schematic diagram of enlarged intake air passage when an air supplement passage is provided

[0058] Figure 9 Schematic diagram of installation structure of smoke guide housing

[0059] Figure 10 Schematic diagram of an installation structure of the smoke guide housing when a protrusion is formed in the heat insulation cavity

[0060] Figure 11 Cross-sectional schematic diagram of the smoke guide housing when a protrusion part and a supplementary flow passage are provided Specific embodiments

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

[0062] Embodiment:

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

[0064] Specifically, for example, as shown in the appendix Figure 1 shown, 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, detachably fixedly connected to the burner housing 1.1 hereinafter by a detachable connection method such as screws), facilitating the maintenance, cleaning or replacement of the smoke guide housing 2 in the later stage.

[0065] Among them, the burner 1 includes a burner housing 1.1, and the upper end of the burner housing 1.1 has a combustion port 1.11 for the flame to spray outwards. Specifically, as an example shown in the appendix Figure 3 shown, the upper end of the burner housing 1.1 forms an opening facing upwards, and this opening is the combustion port 1.11; moreover, several fire grates 1.2 are installed in the burner housing 1.1 in a cavity manner, and an air intake passage 1.12 for air to flow in is formed; an ignition device 1.3 for ignition is also provided in the combustion port 1.11 (this ignition device 1.3 is a conventional ignition device in gas water heaters and gas stoves, such as an electric spark ignition device, etc.).

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

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

[0068] The smoke guide housing 2 is arranged above the burner 1, and the smoke guide housing 2 has: a smoke guide passage 2.1 that is connected to the combustion port 1.11 and discharges the smoke generated by combustion upward. The smoke guide passage 2.1 can be a through-hole arranged vertically in the smoke guide housing 2, and the lower opening of the hole is in communication with the combustion port 1.11.

[0069] At the same time, in order to better prevent the heat and smoke generated by combustion from overflowing, the lower opening of the smoke guide passage 2.1 is arranged in contact with the combustion port 1.11 (that is, the port of the combustion port 1.11 is in contact with or close enough to the port of the lower opening of the smoke guide passage 2.1), so that a combustion area for flame combustion is formed in the smoke guide passage 2.1. The channel diameter of the smoke guide passage 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 passage inside the burner manifold 1.2 to the combustion port 1.11, the air flows from the air intake passage 1.12 to the combustion port 1.11, and the ignition device 1.3 is controlled to be turned on for ignition, so that the gas at the combustion port 1.11 of the burner 1 can be ignited to form an upward gushing combustion flame. The combustion flame surges into the smoke guide passage 2.1 for combustion, so that a combustion area for flame combustion is formed in the smoke guide passage 2.1. At this time, the smoke 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.

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

[0072] Specifically, as an example shown in the appendix Figure 4 The heat exchanger 3 includes a heat exchange housing 3.1, and 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 3As shown, the heat exchange channel 3.11 is a through-hole channel vertically arranged; the lower end of the heat exchange channel 3.11 is butted and communicated with the upper end opening of the smoke guiding channel 2.1, so that the high-temperature flue gas generated by combustion in the smoke guiding channel 2.1 can flow upward into the heat exchange channel 3.11.

[0073] Meanwhile, the heat exchanger 3 further includes a heat exchange 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 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 placed in the heat exchange channel 3.11. At the same time, cold water is conveyed through, for example, a water pipe into the water inlet of the heat exchange 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 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 structures made of materials with good thermal conductivity such as steel strips, stainless steel strips, copper strips, and aluminum strips) can be arranged 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 is configured to: form an air flow that drives the flue gas to flow from the smoke guiding channel 2.1 into the heat exchange channel 3.11.

[0076] The fan assembly 4 can be connected to the heat exchange housing 3.1, placed at the upper end opening of the heat exchange channel 3.11, and is configured to: suck the flue gas in the smoke guiding channel 2.1. To drive the flue gas to flow from the smoke guiding channel 2.1 into the heat exchange channel 3.11. At this time, the fan assembly 4 is also provided with a smoke exhaust pipe for discharging the sucked flue gas in a directional manner, and the smoke exhaust pipe is used to communicate with the smoke exhaust port in the building to discharge the flue gas in a directional manner.

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

[0078] In summary, the combustion device, 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 device. When the combustion device burns as described above, there will be the following problems: the high-temperature heat inside the smoke guide housing 2 is likely to overflow, which will not only cause the surface temperature of the smoke guide housing 2 to be too high, affecting the service life of the smoke guide housing 2, but also have an adverse impact on the electrical components outside the combustion device, and in severe cases, will greatly reduce the service life of the gas water heater.

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

[0080] As a form, a water-cooling structure can be arranged on the outer surface of the smoke guide housing 2 to solve the above problems. However, setting up a water-cooling structure often requires a complex pipeline structure, resulting in problems such as a complex pipeline structure and difficult installation of the combustion device; moreover, in order to better prevent water leakage and water body corrosion, the water-cooling pipeline structure often requires a large cost.

[0081] In order to solve the above problems while better simplifying the structure and reducing costs, this application proposes: a combustion device 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 device is proposed.

[0082] As an example, as shown in the attached Figure 3 and the attached Figure 5 The combustion device in this embodiment further includes a heat insulation structure formed in the side wall of the smoke guide channel 2.1.

[0083] Specifically, the heat insulation structure includes a heat insulation cavity 2.2, an air outlet channel 2.4, and an air inlet channel 2.3. To be exact, for example, as shown in the attached Figure 3 and the attached Figure 5 The heat insulation cavity 2.2 is a cavity arranged in the side wall of the smoke guide channel 2.1; the air outlet channel 2.4 is a hole arranged in the side wall of the heat insulation cavity 2.2 close to the smoke guide channel 2.1 in the transverse direction and for connecting the heat insulation cavity 2.2 with the smoke guide channel 2.1; the air inlet channel 2.3 can be a hole arranged in the side wall of the heat insulation cavity 2.2 far from the smoke guide channel 2.1 in the transverse direction or the bottom wall of the heat insulation cavity 2.2 and for connecting the heat insulation cavity 2.2 with the outside air, and the air inlet channel 2.3 is connected to the lower end area 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 end area, a middle area, and a lower end area from top to bottom.)

[0084] At this time, when a flame is formed in the combustion zone of the smoke guiding channel 2.1, oxygen and fuel gas are consumed, and high-temperature flue gas that rises directly is formed, so as to form a low-pressure area in the smoke guiding channel 2.1; at this time, external air will enter the heat insulation cavity 2.2 from the air inlet channel 2.3, flow through the heat insulation cavity 2.2 and then flow out from the air outlet channel 2.4 into the smoke guiding channel 2.1, and then a flowing air current (as shown by the arrow in the attachment Figure 5 is formed in the heat insulation cavity 2.2, which is called the heat insulation air current; this heat insulation air current forms air-cooled heat insulation, and can bring the heat dissipated from the surface of the smoke guiding shell 2 to the outside of the smoke guiding channel 2.1 back into 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 device, but also bring the dissipated heat back into the smoke guiding channel 2.1 to exchange heat with the heat exchanger 3, improving the overall effective heat output rate of the combustion device. At the same time, the above heat insulation structure does not need to additionally set up a complex water pipe structure, has a simpler and easier-to-install structure, and does not need to spend a large cost to deal with the control of the water cooling circuit and the erosion problem of the water circuit, thus better avoiding the problems existing in water cooling.

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

[0086] Furthermore, in this embodiment, as shown in the attachment Figure 5 and the attachment Figure 7 shown, the air inlet channel 2.3 is 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) and is configured to extend vertically. That is, the air inlet channel 2.3 is a vertically penetrating channel arranged in the bottom wall of the heat insulation cavity 2.2. The upper end of the channel 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 air inlet channel 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 guiding shell 2 can flow upward into the heat insulation cavity 2.2 more smoothly and flow upward to the air outlet channel 2.4 more smoothly, so as to better and more stably form a continuous flowing heat insulation air current and optimize the blocking effect of the overflowing heat.

[0087] In any of the above solutions, as shown in the attachment Figure 6 shown, a guiding part 2.6 protruding into the smoke guiding channel 2.1 can also be arranged on the side wall of the smoke guiding channel 2.1.

[0088] Specifically, the inside of the flow guiding part 2.6 is arranged as a cavity and is communicated with the heat insulation cavity 2.2; moreover, the outer wall of the flow guiding part 2.6 (that is, one side wall of the convex outer surface of the flow guiding part 2.6 for contacting the air flow in the smoke guiding channel 2.1) includes: a diversion wall 2.61 facing the combustion port 1.11 (that is, facing the air flow after the air flow is output from the combustion port 1.11), a backflow wall 2.63 facing away from the combustion port 1.11 (that is, facing away from the air flow after the air flow is output from the combustion port 1.11), and a connecting wall 2.62 extending vertically (vertically extending or arcuately extending) 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 the attached Figure 6 figure, 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 arcuately extending vertically.

[0089] Among them, the diversion wall 2.61 is inclined to guide the air flow 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 air flow (air, gas, high-temperature flue gas, etc.) can be better gathered at the center of the smoke guiding channel 2.1 to improve the combustion efficiency and heat concentration rate, and then the heat can be better concentrated and output, which is convenient for better utilization of the heat subsequently; on the other hand, the air flow can be synchronously driven away from the side wall of the smoke guiding channel 2.1 to further weaken the effect of heat transfer outward.

[0090] At this time, as a way, the air outlet channel 2.4 can be arranged on the backflow wall 2.63.

[0091] 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 air flow in the heat insulation cavity 2.2 flows out from the air outlet channel 2.4, it can be conveyed obliquely upward. Realize that the air flow 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 air flow 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 insulation air flow, and then improve the stability of the heat output of the combustion device while optimizing the blocking effect of the overflowing heat.

[0092] Regardless of the above method, the air flow formed by combustion in the smoke guiding channel 2.1 is not likely to have an unnecessary obstructive effect on the air flow in the heat insulation cavity 2.2, so that the heat insulation air flow for heat blocking as described above can always be smoothly formed in the heat insulation cavity 2.2.

[0093] Moreover, when the air outlet channel 2.4 is provided on the connecting wall 2.62, due to the guiding effect of the diversion wall 2.61 on the air flow, the diameter of the smoke guiding channel 2.1 at the connecting wall 2.62 will be driven to decrease, resulting in an increase in flow velocity and a decrease in fluid pressure in this area; thus, it can better attract the air flow in the heat-resistant cavity 2.2, further improving the smoothness of the formation and circulation of the heat-resistant air flow (the air flow in which the external air enters the heat-resistant cavity 2.2 from the air inlet channel 2.3 and then flows out from the air outlet channel 2.4 to 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.

[0094] Further, when the diversion part 2.6 is provided, as shown in the appendix Figure 8 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 this 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.

[0095] In this way, by providing the supplementary air channel 2.12, on the one hand, it can further increase the intake of air, enabling the fuel gas to burn more fully. On the other hand, combined with the setting of the above-mentioned diversion part 2.6, with the rest being the same, adding the supplementary air channel 2.12 can increase the overall intake of air, and thus can better increase the gas flow velocity in the smoke guiding channel 2.1 at the connecting wall 2.62, further facilitating the formation and smooth circulation of the heat-resistant air flow, so as to better block the heat in the smoke guiding channel 2.1 from overflowing outward.

[0096] The supplementary air channel 2.12 in this embodiment 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; moreover, in some cases, it can also 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.

[0097] In some solutions, for one side wall of the heat insulation cavity 2.2 located between the smoke guiding channel 2.1 and the heat insulation cavity 2.2, a number of heat guiding parts 2.24 protruding into the heat insulation cavity 2.2 can be provided on this side wall. This can increase the contact area between the air flow and the side wall of the smoke guiding channel 2.1, thereby improving the heat exchange efficiency between the air flow and the side wall of the smoke guiding channel 2.1, so that the air flow flowing through the heat insulation cavity 2.2 can bring more heat back into the smoke guiding channel 2.1.

[0098] 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 channel 2.1, and the heat insulation cavities 2.2 in each heat insulation structure communicate with each other to form an annular cavity surrounding the outer periphery of the smoke guiding channel 2.1, blocking the heat in the smoke guiding shell 2 from overflowing outward in all directions.

[0099] At this time, as shown in the appendix Figure 9 As shown, the smoke guiding shell 2 mainly includes an inner layer shell 2a with a smoke guiding channel 2.1 inside, and an outer layer shell arranged around the inner layer shell 2a. A heat insulation cavity 2.2 is formed at intervals between the inner layer shell 2a and the outer layer shell. The outer layer shell includes a first outer layer plate 2b.1 and a second outer layer plate 2b.2. The first outer layer plate 2b.1 and the second outer layer plate 2b.2 are detachably connected by, for example, screws to form the outer layer shell. Moreover, both the first outer layer plate 2b.1 and the second outer layer plate 2b.2 are preferably detachably and fixedly connected to the inner layer shell 2a by, for example, screws. The air outlet channel 2.4 is arranged on the inner layer shell 2a, and the air inlet channel 2.3 is arranged on the outer layer shell.

[0100] On the basis of any of the above solutions, especially in the solution with the diversion part 2.6 provided, as shown in the appendix Figure 10 As shown, on at least one side wall of the heat insulation cavity 2.2, there can also be provided a protruding part that is opposite to the central area of the smoke guiding channel 2.1 (the area where the axis of the smoke guiding channel 2.1 is located, which is often also the area where high-temperature smoke gathers) in the transverse direction (horizontal direction) and protrudes into the heat insulation cavity 2.2. The setting of this protruding part makes: in the vertical direction, the diameter of the heat insulation cavity 2.2 (the diameter or size of the cavity opening) is arranged in a large, small, large pattern (that is, first decreasing and then increasing); and, in the transverse direction, a partial area where the diameter of the heat insulation cavity 2.2 decreases is opposite to the central area of the smoke guiding channel 2.1.

[0101] For example, as shown in the appendix Figure 10As shown in the figure, on one side wall of the heat insulation cavity 2.2 that is laterally close to the smoke guide channel 2.1, there is provided: a first convex portion 2.21 that is laterally opposite to the central region of the smoke guide channel 2.1 and protrudes into the heat insulation cavity 2.2; or, on one side wall of the heat insulation cavity 2.2 that is laterally far from the smoke guide channel 2.1, there is provided: a second convex portion 2.22 that is laterally opposite to the central region of the smoke guide channel 2.1 and protrudes into the heat insulation cavity 2.2.

[0102] By providing the convex portion, when the air flow in the heat insulation cavity 2.2 flows through the narrow opening region that is laterally opposite to the central region of the smoke guide channel 2.1, the flow rate can be increased to a certain extent. It can be achieved that: not only can the contact area between the air flow and the smoke guide housing 2 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 device in the gas water heater, in the case of a certain air flow rate, the region where heat is more likely to overflow can pass through a faster air flow to bring the heat back into the smoke guide channel 2.1 more quickly; while the region where the heat overflows more slowly passes through a slower and larger air flow rate to stably, slowly and fully transfer heat to 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.

[0103] 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 cavity 2.2.

[0104] Further, as shown in the appendix Figure 11 As shown in the figure, on the side wall of the heat insulation cavity 2.2 facing away from the smoke guide channel 2.1 (i.e., the side wall of the heat insulation cavity 2.2 that is laterally far from the smoke guide channel 2.1), there is a portion that is laterally aligned with the convex portion, and this portion can also be provided with a supplementary flow hole 2.23 for the air in the external space of the smoke guide housing 2 to flow into the heat insulation cavity 2.2. When the heat insulation air flow is formed as described above, the external air flow can flow into the heat insulation cavity 2.2 more quickly through the supplementary flow hole 2.23, increasing the flow rate of the overall heat insulation air flow, further optimizing and improving the blocking effect on the overflowing heat, and better reducing the surface temperature of the smoke guide housing 2.

[0105] 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, 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. Therefore, it should not be construed as a limitation of the present invention. It should be further noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to", "fixed", etc. in the description should be understood in a broad sense. For example, "connected" 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.

[0106] 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); An air inlet passage (2.3) for connecting the lower end 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: The air outlet channel (2.4) is in communication with the upper end region of the heat-resistance cavity (2.2).

3. The combustion device according to claim 2, 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.

4. The combustion device according to claim 1, 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).

5. 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).

6. The combustion device according to any one of claims 1 to 5, characterized in that: The side wall of the smoke guiding channel (2.1) is provided with: a flow guiding portion (2.6) protruding into the smoke guiding channel (2.1); The interior of the flow guide (2.6) is arranged as a cavity and is connected to the heat-resistance cavity (2.2); Furthermore, the outer wall of the guide portion (2.6) comprises: A flow guide wall (2.61) facing the combustion port (1.11) is arranged in an inclined manner so as to guide the airflow flowing upward from the side wall of the smoke guide channel (2.1) to the center of the smoke guide channel (2.1); A back flow wall (2.63) facing away from the combustion port (1.11); and a connecting wall (2.62) extending in the vertical direction and connecting the flow guide wall (2.61) and the back flow wall (2.63); The air outlet channel (2.4) is arranged on the back flow wall (2.63).

7. The combustion device according to any one of claims 1 to 5, characterized in that: The side wall of the smoke guiding channel (2.1) is provided with: a flow guiding portion (2.6) protruding into the smoke guiding channel (2.1); The interior of the flow guide (2.6) is arranged as a cavity and is connected to the heat-resistance cavity (2.2); Furthermore, the outer wall of the guide portion (2.6) comprises: A flow guide wall (2.61) facing the combustion port (1.11) is arranged at an angle so as to guide the airflow at the side wall of the smoke guide channel (2.1) to the center of the smoke guide channel (2.1); A back flow wall (2.63) facing away from the combustion port (1.11); and a connecting wall (2.62) extending in the vertical direction and connecting the flow guide wall (2.61) and the back flow wall (2.63); The air outlet channel (2.4) is arranged on the connecting wall (2.62).

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

9. The combustion device according to claim 8, characterized in that: The air supplement hole (2.12) is configured to extend vertically so that the air in the external space can flow upward from the air supplement hole (2.12) into the smoke guide channel (2.1) in accordance with the upward discharge of smoke.

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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