Combustion device and gas water heater with same

Abstract

The invention relates to the technical field of household appliances, in particular to a combustion device and a gas water heater with the same, 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 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 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 air inlet duct is used for communicating the heat resistance cavity with the external space of the smoke guide shell; at least one side wall of the heat resisting cavity is provided with a flow dividing part protruding towards the interior of the heat resisting cavity. 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 having the same. Background Art

[0002] A gas heating device (gas water heater) is a civilian heat energy device that converts the chemical energy of gaseous fuel into heat energy and transfers the energy to the circulating water flow through a heat transfer component to achieve rapid heating. Its technical composition mainly includes the following core modules: a combustion device (a functional unit that executes the oxidation reaction of fuel to generate high-temperature fluid), a heat exchanger (using a metal heat conduction element to achieve energy exchange between combustion exhaust gas and liquid working medium), a fan system (configured with a turbocharged gas drive module), and a supporting fluid transmission loop and electronic control component.

[0003] Currently, in the engineering technology field, in order to cope with the temperature rise effect of the high-temperature radiation of the combustion device on the surrounding circuit modules, two main thermal management strategies are implemented: one is to adopt an external coating of a combustion chamber with a circulating liquid cooling and heat dissipation mechanism, and the other is to add a mechanical air cooling component to the outer frame of the device. However, through engineering practice verification, the following technical bottlenecks exist:

[0004] For the liquid cooling circulation system, its heat dissipation pipeline needs to be arranged in a three-dimensional coupling manner with the outer wall of the combustion chamber, resulting in a doubling of the difficulty of the device topology structure design and strict assembly process requirements; in order to ensure the airtight performance of the cooling circuit and prevent electrochemical corrosion of the flow channel material, special anti-corrosion alloys must be used and surface passivation treatment must be carried out, significantly increasing the raw material procurement cost; under continuous operating conditions, cooling working medium crystallization deposition may occur, leading to an increase in the thermal resistance coefficient and an increase in the system maintenance frequency.

[0005] For the mechanical air cooling scheme, because an independent turbo air supply module needs to be configured, it not only generates additional hardware purchase expenses, but also needs to plan a dedicated air flow channel and a supporting power regulation module, resulting in a simultaneous increase in the internal space utilization rate and wiring complexity of the device.

[0006] It can be seen that the above two types of conventional heat dissipation 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 device that combines the gas combustion characteristics, can block the 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 device.

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

[0010] 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 the burner, which has therein: a smoke guide passage communicating with the combustion port and discharging the smoke generated by combustion upwards, 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 heat insulation cavity with the external space of the smoke guide housing;

[0017] At least one side wall of the heat insulation cavity is provided with a diversion portion protruding into the heat insulation cavity so that: there is a narrow area with a reduced diameter in the heat insulation cavity;

[0018] And the diversion portion is arranged in alignment with the central area of the smoke guide passage so that: the narrow area is in alignment with the central area of the smoke guide passage.

[0019] In some solutions, the air inlet passage communicates with the lower end area of the heat insulation cavity, and the air outlet passage communicates with the upper end area of the heat insulation cavity;

[0020] Or, the air inlet passage communicates with the upper end area of the heat insulation cavity, and the air outlet passage communicates with the lower end area of the heat insulation cavity.

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

[0022] And 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 upwards into the heat insulation cavity from the air inlet passage in a manner adapted to the upward discharge of the smoke.

[0023] In some solutions, the side wall of the heat insulation cavity is provided with: a supplementary flow passage for communicating the narrow area of the heat insulation cavity with the external space of the smoke guide housing.

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

[0025] In some solutions, the side wall of the smoke guide passage is provided with: a diversion portion protruding into the smoke guide passage;

[0026] The inside of the diversion part is arranged as a cavity and is communicated with the heat insulation cavity;

[0027] Moreover, the outer wall of the diversion part includes:

[0028] A diversion wall facing the combustion port, which is inclined so as to guide the airflow flowing upward from the side wall of the smoke guide channel to the center of the smoke guide channel;

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

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

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

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

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

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

[0035] 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;

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

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

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

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

[0040] A supplementary air hole channel is provided in the stepped flow part, and the air in the external space of the smoke guide housing enters the smoke guide channel through it.

[0041] 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.

[0042] The gas water heater includes the combustion device described in any of the above solutions.

[0043] The main beneficial effects of the above technical solutions are as follows:

[0044] 1. By providing a heat-blocking structure located in the side wall of the smoke guide channel in the smoke guide housing, which can use cold air as a heat-insulating 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.

[0045] 2. The overall heat-blocking structure is simpler, which can better reduce the production cost.

[0046] 3. In addition to forming air-cooled heat insulation, the heat-blocking air flow 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.

[0047] 4. By forming a heat-blocking 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.

[0048] 5. By setting a flow splitting part, when the air flow in the heat-blocking cavity flows through the narrow opening area opposite to the central area of the smoke guide channel in the transverse direction, the flow rate can be increased to a certain extent. Achieve: not only can the contact area between the air flow and the smoke guide housing be increased, but also the heat transferred to the side wall of the smoke guide channel can be better brought back into the smoke guide channel, optimizing the heat insulation effect.

[0049] 6. By setting a 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 future; on the other hand, it can synchronously drive the air flow away from the side wall of the smoke guide channel to further weaken the effect of heat transfer outward.

[0050] 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 of the overflowing heat.

[0051] 8. By setting a supplementary air hole channel, on the one hand, the intake of air can be further increased to enable better full combustion of the gas; on the other hand, combined with the setting of the above-mentioned diversion part, with the same other settings, adding a supplementary air hole channel can increase the overall intake air volume, and then better improve the gas flow rate in the smoke guide channel at the connecting wall, further assisting in the formation and smooth flow of the heat-blocking air flow to better block the heat in the smoke guide channel from overflowing outward.

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

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

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

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

[0056] Figure 3 It is a schematic sectional view of the combustion device.

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

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

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

[0060] Figure 7 It is an enlarged schematic diagram of the air inlet passage.

[0061] Figure 8 It is an enlarged schematic diagram of the air inlet passage when a supplementary air passage is provided.

[0062] Figure 9 It is a schematic diagram of the installation structure of the smoke guide housing. Detailed implementation manners

[0063] The present invention will be specifically illustrated below with reference to embodiments:

[0064] Embodiment:

[0065] A gas water heater, as shown in the appendix Figure 1 shown, mainly includes a water heater housing and a number of functional components disposed within the water heater housing. The number of functional components mainly includes: a combustion 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 blower assembly 4 for forming a directional air flow.

[0066] Specifically, 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 fixed to the burner 1 by a detachable connection method such as screws (for example, detachably fixed to the burner housing 1.1 hereinafter by a detachable connection method such as screws), which facilitates the maintenance, cleaning or replacement of the smoke guide housing 2 in the later stage.

[0067] 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 shown in the appendix Figure 3Shown as an example, an opening facing upward is formed at the upper end of the burner housing 1.1, and this opening is the combustion port 1.11; moreover, several burner ports 1.2 are installed in the burner housing 1.1 in a cavity form, 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 device conventionally used for ignition in gas water heaters and gas stoves, such as an electric spark ignition device, etc.).

[0068] A gas passage for gas to flow in is formed in the burner port 1.2. The lower end of this gas passage is used to connect to a gas transmission pipeline, and the upper end is communicated with the combustion port 1.11, so that gas can be transported to the combustion port 1.11 through the burner port 1.2.

[0069] The lower end of the air intake passage 1.12 is provided with an open end for air to flow in; the upper end is communicated with the combustion port 1.11, so that external air can be transported to the combustion port 1.11 from the air intake passage 1.12.

[0070] 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 communicated with the combustion port 1.11 and discharges the smoke generated by combustion upward. The smoke guide passage 2.1 can be a through-hole formed in the smoke guide housing 2 in the vertical direction, and the lower end opening of this hole is communicated with the combustion port 1.11.

[0071] At the same time, in order to better avoid the overflow of heat and smoke generated by combustion, the lower end 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 fitted or close enough to the port of the lower end opening of the smoke guide passage 2.1), so that a combustion area for the flame to burn 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.

[0072] During operation, gas is transported from the gas passage inside the burner port 1.2 to the combustion port 1.11, air flows from the air intake passage 1.12 to the combustion port 1.11, and the ignition device 1.3 is controlled to 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. This combustion flame surges into the smoke guide passage 2.1 for combustion, so that a combustion area for the flame to burn 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.

[0073] 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.

[0074] Specifically, as shown in the appendixFigure 4 Shown 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 by, for example, screws, or connected to other external support structures, such as a water heater housing. The heat exchange housing 3.1 has a heat exchange channel 3.11 that is through at both ends (as shown in the appendix Figure 3 shown, the heat exchange channel 3.11 is a vertically through hole); the lower end of the heat exchange channel 3.11 is butt - jointed and communicated with the upper - end opening of the smoke guide channel 2.1, so that the high - temperature flue gas generated by combustion in the smoke guide channel 2.1 can flow upward into the heat exchange channel 3.11.

[0075] At the same time, the heat exchanger 3 further includes a heat exchange pipe 3.2. One end of the heat exchange pipe 3.2 has a water inlet for water inlet, and the other end has a water outlet for water outlet; the heat exchange pipe 3.2 is connected to the heat exchange housing 3.1 and has a part placed in the heat exchange 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.

[0076] 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, aluminum strips, etc.) can 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, so as 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.

[0077] 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.

[0078] 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 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 an exhaust pipe for discharging the sucked flue gas in a directional manner, and the exhaust pipe is used to communicate with the exhaust port in the building to discharge the flue gas in a directional manner.

[0079] The blower assembly 4 can also be connected to the burner 1 and placed at the opening at the lower end of the air intake passage 1.12, and is configured to blow the flue gas in the flue gas passage 2.1 upward, so as to drive the flue gas to flow from the flue gas passage 2.1 into the heat exchange passage 3.11. At this time, the upper end opening of the heat exchange passage 3.11 is used to communicate with the smoke exhaust opening in the building.

[0080] 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 a problem that 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.

[0081] Based on this, a combustion device 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 is needed. And a gas water heater with this combustion device is proposed.

[0082] 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 setting up a complex pipeline structure, resulting in problems such as 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.

[0083] In order to solve the above problems while being able to better simplify the structure and reduce the cost, the present application proposes: a combustion device that combines the gas combustion characteristics to block the heat from dissipating outward through a simple structure and has higher economy. And a gas water heater with this combustion device is proposed.

[0084] As an example, as shown in Appendix Figure 3 and Appendix Figure 5 shown, the combustion device in this embodiment further includes a heat insulation structure formed in the side wall of the flue gas passage 2.1.

[0085] Specifically, the heat insulation structure includes a heat insulation cavity 2.2, an air outlet passage 2.4 and an air inlet passage 2.3. To be exact, for example, as shown in Appendix Figure 3 and Appendix Figure 5As shown, the heat insulation cavity 2.2 is a cavity provided in the side wall of the smoke guiding channel 2.1; the air outlet channel 2.4 is a hole provided in the side wall of the heat insulation cavity 2.2 that is laterally close to the smoke guiding channel 2.1 and allows the heat insulation cavity 2.2 to communicate with the smoke guiding channel 2.1; the air inlet channel 2.3 can be a hole provided in the side wall of the heat insulation cavity 2.2 that is laterally far from the smoke guiding channel 2.1 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.

[0086] At this time, when a flame is formed in the combustion area of the smoke guiding channel 2.1, it will consume oxygen and fuel gas and form high-temperature smoke that rises directly, creating a low-pressure area in the smoke guiding channel 2.1; at this time, the external air will enter the heat insulation cavity 2.2 through the air inlet channel 2.3, flow through the heat insulation cavity 2.2 and then flow out to the smoke guiding channel 2.1 through the air outlet channel 2.4, and thus a flowing air current can be 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, which can bring back the heat dissipated from the surface of the smoke guiding housing 2 to the smoke guiding channel 2.1. It can not only block the heat formed by the flame combustion in the smoke guiding housing 2 from overflowing outward, effectively control the surface temperature of the combustion device, but also bring back the dissipated heat to the smoke guiding channel 2.1 for heat exchange with the heat exchanger 3, improving the overall effective heat output rate of the combustion device. At the same time, the above heat insulation structure does not require an additional complex water pipe structure, has a simpler and easier-to-install structure, and does not require 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.

[0087] On the basis of the above solution, as shown in the appendix Figure 5 As shown, on at least one side wall of the heat insulation cavity 2.2, there can also be provided a diversion part that protrudes into the heat insulation cavity 2.2 and 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 accumulates) in the lateral (horizontal) direction. This diversion part makes the heat insulation cavity 2.2 have a narrow area with a reduced diameter (for example, in the central area of the heat insulation cavity 2.2); for example, the setting of this diversion part results in: in the vertical direction, the diameter (the diameter or size of the cavity opening) of the heat insulation cavity 2.2 is arranged in a large, small, large pattern (that is, first decreasing and then increasing); and, the part of the heat insulation cavity 2.2 with a reduced diameter (narrow area) is opposite to the central area of the smoke guiding channel 2.1 in the lateral direction.

[0088] Specifically, for example, as shown in the appendix Figure 5 As shown, the diversion part can include: a first diversion part 2.21 provided on the side wall of the heat insulation cavity 2.2 that is laterally close to the smoke guiding channel 2.1 and protrudes into the heat insulation cavity 2.2. This first diversion part 2.21 is opposite to the central area of the smoke guiding channel 2.1 in the lateral direction.

[0089] Alternatively, for example, as shown in Figure 5 Figure 2, the flow dividing part may also include a second flow dividing part 2.22 that protrudes into the heat blocking cavity 2.2 and is provided on a side wall of the heat blocking cavity 2.2 that is laterally away from the smoke guiding channel 2.1. The second flow dividing part 2.22 is laterally opposite to the central area of the smoke guiding channel 2.1.

[0090] By setting the flow dividing part, when the air flow in the heat blocking cavity 2.2 flows through the narrow opening area that is laterally opposite to the central area of the smoke guiding channel 2.1, the flow rate can be increased to a certain extent. It can not only increase the contact area between the air flow and the smoke guiding housing 2, and better bring the heat transferred to the side wall of the smoke guiding channel 2.1 back into the smoke guiding 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, when the air flow rate is certain, the area where heat is more likely to overflow can pass through a faster air flow to bring the heat back into the smoke guiding channel 2.1 more quickly; while the area where the heat overflows more slowly passes through a slower and larger air flow rate to stably, slowly and fully transfer heat with the side wall of the smoke guiding channel 2.1 and bring the heat back into the smoke guiding channel 2.1, thereby improving the overall heat insulation effect.

[0091] Wherein, the specific positions of the air inlet channel 2.3 and the air outlet channel 2.4 can be set according to requirements.

[0092] In this embodiment, as a form: the air inlet channel 2.3 is communicated with the lower end area of the heat blocking cavity 2.2, and the air outlet channel 2.4 is communicated with the upper end area of the heat blocking cavity 2.2. (In the vertical direction, by trisecting the heat blocking cavity 2.2, the heat blocking cavity 2.2 is sequentially divided into: an upper end area, a middle area, and a lower end area from top to bottom.)

[0093] Alternatively, as another form: the air inlet channel 2.3 is communicated with the upper end area of the heat blocking cavity 2.2, and the air outlet channel 2.4 is communicated with the lower end area of the heat blocking cavity 2.2. (In the vertical direction, by trisecting the heat blocking cavity 2.2, the heat blocking cavity 2.2 is sequentially divided into: an upper end area, a middle area, and a lower end area from top to bottom.)

[0094] Regardless of the above form, a large area of air flow can be formed in the heat blocking cavity 2.2, thereby forming a larger heat blocking area and improving the blocking effect of the overflowing heat.

[0095] Moreover, based on any one of the above setting schemes of the air inlet channel 2.3 and the air outlet channel 2.4, as shown in Figure 5As shown, one 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 part that is laterally opposite to the diversion part, and a supplementary flow channel 2.23 for air in the external space of the smoke guiding housing 2 to flow into the narrow mouth area of the heat insulation cavity 2.2 can be provided in this part. When the heat insulation air flow is formed as described above, the external air flow can flow into the heat insulation cavity 2.2 more quickly through the supplementary flow channel 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 guiding housing 2.

[0096] Additionally, it should be noted that when the air inlet channel 2.3 is connected to the lower end area of the heat insulation cavity 2.2 and the air outlet channel 2.4 is connected to the upper end area of the heat insulation cavity 2.2. As shown in the attached Figure 5 and the attached Figure 7 As shown, the air inlet channel 2.3 can be provided 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 air inlet channel 2.3 is a vertically penetrating channel provided in the bottom wall of the heat insulation cavity 2.2, with the upper end of the channel connected to the heat insulation cavity 2.2 and the lower end being 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 adaptation to the upward discharge of the smoke. In this way, driven by the upward flow of the high-temperature smoke, the air in the external space of the smoke guiding housing 2 can flow upward into the heat insulation cavity 2.2 more smoothly and flow upward to the air outlet channel 2.4 smoothly, so as to better and more stably form a continuously flowing heat insulation air flow and optimize the blocking effect on the overflowing heat.

[0097] In any of the above solutions, as shown in the attached Figure 6 As shown, a diversion part 2.6 protruding into the smoke guiding channel 2.1 can also be provided on the side wall of the smoke guiding channel 2.1.

[0098] Specifically, the inside of the diversion part 2.6 is provided as a cavity and is connected to the heat insulation cavity 2.2; moreover, the outer wall of the diversion part 2.6 (i.e., the side wall of the protruding outer surface of the diversion part 2.6 that is used to contact the air flow in the smoke guiding channel 2.1) includes: a diversion 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 backflow 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 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 6As shown, the outer wall of the diversion part 2.6 includes: a drainage wall 2.61 facing downward, a backflow wall 2.63 facing upward, and a connecting wall 2.62 extending in an arc shape vertically.

[0099] Among them, the drainage wall 2.61 is inclined so as to guide the airflow flowing upward from the side wall of the smoke guiding channel 2.1 to the center of the smoke guiding channel 2.1 (the area where the axis of the smoke guiding channel 2.1 is located). In this way, on the one hand, the airflow (such as air, gas, and high-temperature flue gas) can be better aggregated at the center of the smoke guiding channel 2.1 to improve the combustion efficiency and heat concentration rate, and then the heat can be better concentrated and output, facilitating better utilization of the heat subsequently; on the other hand, the airflow can be simultaneously driven away from the side wall of the smoke guiding channel 2.1 to further weaken the effect of heat transfer outward.

[0100] At this time, for the air outlet channel 2.4:

[0101] The air outlet channel 2.4 can be arranged on the backflow wall 2.63; or, the air outlet channel 2.4 is arranged on the connecting wall 2.62.

[0102] When the air outlet channel 2.4 is arranged on the connecting wall 2.62, the air outlet channel 2.4 is preferably arranged to extend obliquely so that after the airflow in the heat insulation cavity 2.2 flows out from the air outlet channel 2.4, it can be conveyed obliquely upward. It is achieved that the airflow flowing out from the air outlet channel 2.4 into the smoke guiding channel 2.1 can better conform to the flow of the rising flue gas in the smoke guiding channel 2.1, reduce the unnecessary airflow impact, and at the same time improve the smoothness and stability of the rising flow of the flue gas and the rising flow of the heat insulation airflow, thereby improving the stability of the heat output of the combustion device while optimizing the blocking effect of the overflowing heat.

[0103] Regardless of whether the air outlet channel 2.4 is arranged on the backflow wall 2.63 or the connecting wall 2.62, the airflow formed by combustion in the smoke guiding channel 2.1 is not likely to have an unnecessary obstructive effect on the airflow in the heat insulation cavity 2.2, so that a heat insulation airflow for blocking heat as described above can always be smoothly formed in the heat insulation cavity 2.2.

[0104] Moreover, when the air outlet channel 2.4 is arranged on the connecting wall 2.62, due to the guiding effect of the drainage wall 2.61 on the airflow, it will drive the diameter of the smoke guiding channel 2.1 at the connecting wall 2.62 to decrease, and the flow velocity increases and the fluid pressure decreases in this area; thus, it can better attract the airflow in the heat insulation cavity 2.2, further improving the smoothness of the formation and circulation of the heat insulation airflow (the airflow that enters the heat insulation cavity 2.2 from the air inlet channel 2.3 and then flows out from the air outlet channel 2.4 into the smoke guiding channel 2.1), so as to overall improve the blocking effect of the overflowing heat and better reduce the surface temperature of the smoke guiding housing 2.

[0105] Further, when the diversion part 2.6 is provided, as shown in the appendix Figure 8 it can also be such that the side wall part of the smoke guiding channel 2.1 is formed in a bent manner with: a step flow part 2.11 that extends horizontally and is disposed below the diversion part 2.6. A supplementary air hole channel 2.12 is provided in the step flow part 2.11. The supplementary air hole channel 2.12 is a channel provided in the step flow part 2.11. The upper end of the channel is connected to the smoke guiding channel 2.1, and the lower end is provided with an open end, 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 hole channel 2.12.

[0106] In this way, by providing the supplementary air hole channel 2.12, on the one hand, it can further increase the intake amount of air, so that the gas can burn more fully. On the other hand, combined with the setting of the above-mentioned diversion part 2.6, with the same other settings, adding the supplementary air hole channel 2.12 can increase the overall intake amount of air, and then can better increase the gas flow rate in the smoke guiding channel 2.1 at the connecting wall 2.62, and further provide assistance for the formation and smooth flow of the heat-blocking air flow, so as to better block the heat in the smoke guiding channel 2.1 from overflowing outward.

[0107] The supplementary air hole 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 hole channel 2.12 in adaptation 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 rate; 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.

[0108] In order to improve the overall heat blocking effect, a plurality of the above-mentioned heat blocking structures can also be provided around the smoke guiding channel 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 channel 2.1, blocking the heat in the smoke guiding housing 2 from overflowing outward by 360 degrees.

[0109] At this time, as shown in the appendix Figure 9 the smoke guiding housing 2 mainly includes an inner layer housing 2a with a smoke guiding channel 2.1 inside, and an outer layer housing surrounding the inner layer housing 2a. A heat blocking cavity 2.2 is formed at an interval between the inner layer housing 2a and the outer layer housing. The outer layer housing includes a first outer layer plate member 2b.1 and a second outer layer plate member 2b.2. The first outer layer plate member 2b.1 and the second outer layer plate member 2b.2 are detachably connected by, for example, screws to form the outer layer housing. And, both the first outer layer plate member 2b.1 and the second outer layer plate member 2b.2 are preferably detachably fixedly connected to the inner layer housing 2a by, for example, screws.

[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, 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 to 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.

[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); 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 heat-resisting cavity (2.2) with the external space of the smoke-guiding housing (2); At least one side wall of the heat-resistance cavity (2.2) is provided with a flow diversion portion protruding into the heat-resistance cavity (2.2), so that: the heat-resistance cavity (2.2) has a narrow opening area with a reduced caliber; The narrow opening area is located opposite to the central area of ​​the smoke guiding channel (2.1).

2. The combustion device according to claim 1, characterized in that: The air inlet channel (2.3) is connected to the lower end region of the heat-resistance cavity (2.2), and the air outlet channel (2.4) is connected to the upper end region of the heat-resistance cavity (2.2); Alternatively, the air inlet channel (2.3) is connected to the upper end region of the heat-resistance cavity (2.2), and the air outlet channel (2.4) is connected to the lower end region of the heat-resistance cavity (2.2).

3. The combustion device according to claim 1, characterized in that: The air inlet channel (2.3) is connected to the lower end region of the heat-resistance cavity (2.2), and the air outlet channel (2.4) is connected to the upper end region of the heat-resistance cavity (2.2); 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 2, characterized in that: The side wall of the heat-resistance cavity (2.2) is provided with a supplementary flow channel (2.23) for connecting the narrow opening area of ​​the heat-resistance cavity (2.2) with the external space of the smoke-guiding shell (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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