Combustor and combustion appliance comprising same

Abstract

The invention provides a combustor and a combustion appliance comprising the same, the combustor at least comprises one outer fire cover combustion unit, and when the number of the outer fire cover combustion units is more than one, the adjacent outer fire cover combustion units are arranged in an inner-outer sleeving manner; the outer fire cover combustion unit comprises an outer fire cover, and an outer fire outlet hole is formed in the outer fire cover; the outer fire cover combustion unit further comprises an air cavity and a mixing cavity, the air cavity is connected with air inlet power equipment, one end of the mixing cavity is communicated with the air cavity and the gas supply component, and the other end of the mixing cavity is communicated with the outer fire outlet hole. Primary air is limited by the air cavity, so that the primary air in the air cavity and fuel gas are premixed in the mixing cavity according to a selected proportion and then are supplied to the outer fire outlet hole of the same outer fire cover combustion unit for combustion, and the technical problems that in the prior art, a commercial gas stove is large in noise, high in danger and cost and small in thermal load adjusting range are effectively solved; and the beneficial effects of low noise, low cost, high safety, high heat efficiency and capability of flexibly adjusting the heat load are realized.

Description

Technical Field

[0001] The present invention relates to the technical field of combustion appliances, and particularly to a burner and a combustion appliance including the same. Background Art

[0002] Commercial gas combustion appliances are a kind of commercial kitchen utensils unique to China that use city gas as fuel for cooking Chinese dishes, and are widely used in kitchens and canteens of hotels, restaurants, enterprises and institutions, etc. The heat load of commercial gas combustion appliances is greater than that of household gas cookers. According to the provisions of GB16410-2020 "Household Gas Cookers", the heat load of household cookers is lower than 5.23kW. According to the provisions of GB35848-2018 "Commercial Gas Combustion Appliances", the heat load range of commercial gas combustion appliances is 5.23KW to 80kW. Therefore, the heat load of commercial gas combustion appliances is relatively large, and the heat load requirement range is relatively wide.

[0003] When the existing commercial gas cookers use the forced-draft combustion method, the noise is very loud. Commercial gas combustion appliances include commercial gas stoves, gas steamers, gas water heaters, etc. Commercial gas stoves include large wok stoves, Chinese stir-fry stoves, high-power stoves, etc. Taking large wok stoves and Chinese stir-fry stoves as examples, when large wok stoves and Chinese stir-fry stoves adopt the forced-draft diffusion combustion method, gas and air are mixed and burned at the same time, and the air flow is in a turbulent state, resulting in a very large combustion noise; when large wok stoves and Chinese stir-fry stoves adopt the forced-draft premixed combustion method (that is, the primary air required for combustion is provided by a blower), some secondary air will be supplemented during the combustion of the fire holes, and large turbulence will also occur in the combustion chamber, resulting in a very large combustion noise. Taking high-power stoves as an example, high-power stoves are generally used on the street, and the gas source used is liquefied petroleum gas. When high-power stoves adopt a medium-pressure ejector burner (commonly known as a high-power stove), the medium-pressure ejector burner and the medium-pressure valve are non-standard products, posing a relatively large safety hazard; when high-power stoves adopt the forced-draft premixed combustion method, in order to save costs, the ratio of air to gas is manually adjusted, which is very inaccurate, and a large amount of secondary draft air will be supplemented during the combustion of the fire holes, resulting in a very large combustion noise.

[0004] The existing household forced-draft burners that can accurately provide the primary air volume to ensure the accurate combustion of the burner are applicable to a relatively small heat load, and the adjustment range of the heat load size is limited, and cannot meet the heat load requirements of commercial gas combustion appliances. If a proportional valve is used to control the ratio of gas and air in the forced-draft combustion method, although the ratio of air to gas can be accurately adjusted, the proportional valve is expensive, especially the multi-airway proportional valve is more expensive. The price of the proportional valve on the market ranges from a few hundred yuan, while the price of an ordinary high-power stove is also a few hundred yuan. Therefore, the cost of the high-power stove will be greatly increased, lacking price competitiveness.

[0005] Therefore, there is an urgent need to propose a burner for commercial gas combustion appliances with low noise, high safety, low cost and a wide range of heat load adjustment. Summary of the Invention

[0006] By providing a burner and a combustion appliance containing the same in an embodiment of the present application, the technical problems in the prior art that the burner of the commercial combustion appliance has high noise, low safety, high cost and a small heat load adjustment range are solved.

[0007] To solve the above technical problems, in a first aspect, an embodiment of the present application provides a burner, which is characterized in that it includes at least one outer fire cover combustion unit, and when the number of the outer fire cover combustion units exceeds one, the inner and outer sizes of adjacent outer fire cover combustion units are nested with each other;

[0008] The outer fire cover combustion unit includes an outer fire cover, and the outer fire cover is provided with outer fire holes;

[0009] The outer fire cover combustion unit further includes an air chamber and a mixing chamber. The air chamber is connected to an air intake power device. One end of the mixing chamber is communicated with both the air chamber and a gas supply component, and the other end is communicated with the outer fire holes; the air chamber defines primary air so that the primary air therein and the gas are premixed in the mixing chamber in a selected ratio and then supplied to the outer fire holes of the same outer fire cover combustion unit for combustion.

[0010] Further, the burner includes a burner bottom plate and an outer nozzle bottom plate arranged at intervals up and down. The outer fire cover combustion unit includes an enclosing edge arranged between the burner bottom plate and the outer nozzle bottom plate. The enclosing edge and the upper burner bottom plate and the lower outer nozzle bottom plate enclose and define the air chamber.

[0011] Further, the outer fire cover includes an outer cylinder body, and at least one fire outlet ring extending towards the center of the outer cylinder body is formed on the outer cylinder body. The outer fire holes are arranged on the inner peripheral wall of the fire outlet ring;

[0012] The burner further includes a seal arranged at the center of the innermost outer fire cover combustion unit. The inner wall surface of the outer cylinder body, the seal and the fire outlet ring between the outer cylinder body and the seal enclose the mixing chamber of the innermost outer fire cover combustion unit on the top surface of the burner bottom plate;

[0013] When the number of the outer fire cover combustion units exceeds one, adjacent outer fire cover combustion units are in clearance fit, and the outer cylinder bodies between adjacent outer fire cover combustion units and the fire outlet rings of the relatively outer outer fire cover combustion units enclose the mixing chamber of the relatively outer outer fire cover combustion unit on the top surface of the burner bottom plate.

[0014] Further, the seal is an inner cylinder, which is arranged at the center of the outermost fire ring on the innermost side of the burner. The inner cylinder forms a space for accommodating the inner fire cover, and the inner wall surface of the outer cylinder, the outer wall surface of the inner cylinder, and the intermediate outermost fire ring enclose a mixing chamber for the outermost fire cover combustion unit on the top surface of the burner base plate.

[0015] Further, the outermost fire cover combustion unit further includes a mixing pipe for communicating the mixing chamber and the air chamber, and the mixing pipe penetrates through the burner base plate.

[0016] The gas supply component is an outer nozzle. Within the same outermost fire cover combustion unit, the outer nozzle passes through the outer nozzle base plate and extends into the air chamber, and the gas ejected by the outer nozzle and the air in the air chamber jointly enter the mixing chamber through the mixing pipe.

[0017] Further, the outermost fire cover combustion unit further includes a first air through hole for communicating the mixing chamber and the air chamber of the same outermost fire cover combustion unit, and the first air through hole is opened on the burner base plate.

[0018] Further, a guide plate is provided at the outlet of the mixing pipe. The fixed end of the guide plate is fixed on the burner base plate, and the free end of the guide plate is located above the corresponding mixing pipe outlet and extends along the inner peripheral wall of the mixing chamber to guide the air and gas to spiral into the mixing chamber in one direction.

[0019] The first air through hole is adjacent to a mixing pipe, and the first air through hole is located below the guide plate of the adjacent mixing pipe to share the same guide plate.

[0020] Further, the outermost fire cover combustion unit further includes a second air through hole for communicating the mixing chamber and the air chamber of the same outermost fire cover combustion unit. The second air through holes are arranged at intervals along the circumferential direction of the mixing chamber on the burner base plate, and at least part of the second air through holes are provided with enclosing covers on the same side along the circumferential direction of the mixing chamber, and each enclosing cover defines the air of the second air through hole to spiral into the mixing chamber in the same direction.

[0021] Further, the outermost fire cover includes at least one outermost fire ring, and the outer fire holes on the same outermost fire ring form a fire outlet surface.

[0022] When the outermost fire cover includes at least two outermost fire rings, each outermost fire ring is gradually downward from the outer cylinder to the center of the outer cylinder, then the outermost fire cover forms a plurality of stepped fire outlet surfaces that gradually shrink and descend from the inner peripheral surface of the outer cylinder to the center of the outer cylinder.

[0023] An annular end face extending into the outer cylinder body is provided on the top surface of the outer cylinder body, the fire outlet ring is fixed on the upper surface or the lower surface of the annular end face, and adjacent fire outlet rings are connected by a connecting ring.

[0024] Further, each of the fire outlet rings at least includes a fire outlet sheet layer, each fire outlet sheet layer at least includes a fire outlet sheet, and the inner edge of the fire outlet sheet is spaced and recessed outward to form a plurality of fire outlet grooves with the notches facing the center of the fire outlet sheet;

[0025] A cover, a gasket layer or the annular end face is provided on the upper surface of each fire outlet sheet layer, a gasket layer or the annular end face is provided on the lower surface of each fire outlet sheet layer, and each gasket layer at least includes a gasket; the fire outlet grooves in the same fire outlet sheet layer are vertically aligned, and together with the cover, the gasket layer or the annular end face adjacent above, and the gasket layer or the annular end face adjacent below, they enclose a layer of outer fire outlet holes, and the outer fire outlet holes in the same layer are arranged at intervals in the circumferential direction and form a circle;

[0026] Each of the outer fire outlet holes is communicated with an independent vertical air inlet channel, and the vertical air inlet channel is communicated with the mixing cavity of the same outer fire cover combustion unit;

[0027] The vertical air inlet channel corresponding to any one of the outer fire outlet holes is arranged below the corresponding outer fire outlet hole, the top end of the vertical air inlet channel is communicated with the corresponding outer fire outlet hole, and the bottom end of the vertical air inlet channel extends to be communicated with the mixing cavity;

[0028] When the fire outlet ring is fixed on the lower surface of the annular end face, the fire outlet ring is located in the mixing cavity, at least part of the outer fire outlet holes are formed with a transverse air inlet channel, the transverse air inlet channel is horizontally arranged on one side of the corresponding outer fire outlet hole, and the transverse air inlet channel communicates the mixing cavity and the corresponding outer fire outlet hole.

[0029] Further, the outer fire cover combustion unit further includes a sealing edge for sealing the gap between the outer cylinder body and the burner bottom plate, the sealing edge is fixed on the burner bottom plate, and the sealing edge extends closely along the inner bottom edge of the outer cylinder body.

[0030] Further, the gas supply component is communicated with a gas source through a gas pipeline, and a switch valve is provided on the gas pipeline. The outer fire cover combustion unit further includes a temperature control device, and the temperature control device includes:

[0031] A temperature sensor, which is arranged in the mixing cavity and is used for detecting the temperature of the gas in the mixing cavity;

[0032] A controller, the signal input end of the controller is connected to the temperature sensor for receiving the temperature signal acquired by the temperature sensor, the signal output end of the controller outputs a control signal, and the control signal is used to control the switching valve or the air intake power device, so as to control the on-off of the gas or the air intake volume;

[0033] A safety temperature threshold is pre-stored in the controller. The controller receives the temperature signal acquired by the temperature sensor and compares it with the temperature threshold. When the temperature corresponding to the temperature signal is higher than the temperature threshold, the controller determines that the temperature in the mixing chamber is too high, and the controller closes the switching valve to block combustion;

[0034] A preheating temperature threshold is also pre-stored in the controller. The controller receives the temperature signal acquired by the temperature sensor and compares it with the preheating temperature threshold. When the temperature corresponding to the temperature signal is lower than the preheating temperature threshold, the controller determines that the gas temperature in the mixing chamber has not reached the normal operating temperature, and the controller adjusts the air intake power device so that the air intake power device provides air according to the air volume corresponding to a ratio lower than the selected ratio; when the temperature corresponding to the temperature signal is not lower than the preheating temperature threshold, the controller determines that the gas temperature in the mixing chamber has reached the normal operating temperature, and the controller controls the air intake power device so that the air intake power device provides air in sufficient quantity according to the air volume corresponding to the selected ratio.

[0035] Further, the outer fire cover combustion unit includes at least two air intake power devices.

[0036] In a second aspect, an embodiment of the present application provides a combustion appliance, and the combustion appliance includes the burner described above;

[0037] When the combustion appliance is a gas stove, the gas stove includes a bottom shell, a burner installation is provided on the bottom surface of the bottom shell, and a plurality of support feet are spaced apart on the edge of the burner installation, and the burner is fixedly mounted on the support feet.

[0038] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0039] (1) The burner according to the embodiment of the present application includes at least one outer fire cap combustion unit. When the number of the outer fire cap combustion units exceeds one, the inner and outer sizes of adjacent outer fire cap combustion units are nested with each other. Therefore, various types of outer fire cap combustion units with different heat loads (powers) can be prefabricated modularly. Later, according to the total heat load requirement, the types and numbers of the outer fire cap combustion units can be flexibly selected and assembled into the burner, which has a wide heat load adjustment range, can adapt to various heat loads, and has strong versatility. In addition, the burner can adjust the rotation speed of the air intake power device according to the size of the gas intake, accurately provide the primary air volume, and at the same time limit the primary air volume by setting an air chamber to ensure the accurate combustion of the burner, that is, it can burn sufficiently, and has a low excess air coefficient, reduces noise, improves the use experience, produces less flue gas, increases the flue gas temperature, and thus improves the heat transfer efficiency. At the same time, the burner is provided with an air chamber that limits the primary air. The gas can be adjusted in gears through a cock valve to cooperate to achieve the accurate ratio of air to gas and achieve sufficient combustion. Since the cock valve is inexpensive (generally dozens of yuan) and the cock valve is a mature standard product with high safety, the burner has a low cost and high safety. Therefore, the embodiment of the present application effectively solves the technical problems of high noise, high danger, high cost and small heat load adjustment range in the prior art of commercial gas stoves, and realizes the beneficial effects of low noise, low cost, high safety, high thermal efficiency and flexible heat load adjustment.

[0040] (2) The burner in this embodiment only includes two chambers, namely an air chamber and a mixing chamber, and does not need to be provided with an ejector. Compared with the prior art, the forced-draft burner includes three chambers, namely an air chamber (where air enters), a rotating air chamber (where the ejector and the nozzle cooperate), and a mixing chamber (where air and gas are mixed), and is provided with an ejector, and the structure is more compact and the production cost is lower. Although this embodiment only includes two chambers, namely an air chamber and a mixing chamber, since the mixing chamber in the embodiment of the present application is formed by matching an outer cylinder, it can be set relatively large, and air and gas can be fully mixed in the mixing chamber. And because the air enters in a forced-draft manner, the air has sufficient initial pressure to enter the mixing chamber, and there is no need to additionally provide an ejector to eject air into the mixing chamber by gas.

[0041] (3) The outer fire cap of the embodiment of the present application is composed of a series of fire outlet rings. Various fire outlet rings with matching sizes can be prefabricated modularly. Later, according to the heat load requirement, the number of fire outlet rings can be flexibly selected and assembled into the outer fire cap, which has the function of adjusting the heat load.

[0042] (4) The external burner cap of the application implementation method is a sheet metal burner cap assembled from pieces of flame outlet pieces, gaskets, caps, and connecting rings. The flame outlet pieces, gaskets, caps, and connecting rings are produced modularly, and then the external burner cap is assembled according to specific needs. By adjusting the number of layers of the flame outlet pieces, the number of layers of the flame outlet holes can be changed. By adjusting the number of the flame outlet pieces within the flame outlet piece layer, the flame outlet area of the external flame outlet holes can be adjusted. By adjusting the number of layers of the gaskets, the spacing between the upper and lower layers of the external flame outlet holes can be adjusted. By adjusting the inner diameter of the flame outlet ring, the degree of flame dispersion can be adjusted. Multiple combinations can be combined to adapt to different heat loads (powers), achieving fine adjustment of the heat load adjustment. Combined with the adjustment of the type and number of the external burner cap combustion units and the adjustment of the number of the flame outlet rings of the external burner cap, the burner described in this embodiment has a wider and more delicate possibility of heat load adjustment, can adapt to a variety of heat loads, and has strong versatility.

[0043] (5) A guide plate is provided at the outlet of the mixing pipe. The fixed end of the guide plate is fixed on the burner bottom plate, and the free end is located above the outlet of the mixing pipe and extends along the inner peripheral wall of the mixing cavity to guide air and gas to spiral into the mixing cavity in one direction. The rotating air flow absorbs the heat transmitted downward during the combustion of the burner and quickly returns to the external burner cap, causing the heat to return to the heating area. On the one hand, it reduces the heat transfer from the heating area to the non-heating area, reduces the temperature rise in the non-heating area, and improves the user experience. On the other hand, it reduces the heat loss in the heating area and further improves the thermal efficiency. In addition, the spiral intake increases the rotational kinetic energy of the air and gas entering through the mixing pipe, thus making the air and gas mix evenly.

[0044] (6) The external burner cap combustion unit further includes a first air through hole for communicating the mixing cavity and the air cavity of the same external burner cap combustion unit, which increases the efficiency of the primary air in the air cavity entering the mixing cavity, so that a low-power blower can be used, which is convenient for reducing the noise caused by the blower. And the first air through hole is arranged adjacent to a mixing pipe and shares the same guide plate, reducing the design of the additional guiding structure of the first air through hole, thereby reducing the occupation of the mixing cavity space and the production cost of the burner.

[0045] (7) The outer burner cap combustion unit further includes a second air through-hole for communicating the mixing chamber and the air chamber of the same outer burner cap combustion unit. The second air through-holes are spaced circumferentially along the mixing chamber and are opened on the burner base plate, which improves the efficiency of air entering the mixing chamber. As a result, a blower with low power can be used, which is convenient for reducing the noise caused by the blower. Moreover, at least part of the second air through-holes are provided with an enclosing cover along the same side of the circumferential direction of the mixing chamber. Each enclosing cover defines that the air in the second air through-hole spirally enters the mixing chamber in the same direction. The rotating air flow absorbs the heat transferred downward during the combustion of the burner and quickly returns to the outer burner cap, so that the heat returns to the heating area. On the one hand, the heat transfer from the heating area to the non-heating area is reduced, the temperature rise of the non-heating area is reduced, and the user experience is improved. On the other hand, the heat loss in the heating area is reduced, and the thermal efficiency is further improved. In addition, the rotational kinetic energy of the air and gas entering through the mixing pipe is increased, so that the air and gas are evenly mixed.

[0046] (8) Since the mixing chamber and the air chamber are adjacent to each other vertically, the pressure loss of the air in the air chamber entering the mixing chamber is very small, and there is enough passage for the air in the air chamber to enter the mixing chamber, so that the efficiency of the air in the air chamber entering the mixing chamber is very high. In addition, when a certain outer burner cap combustion unit bears a high thermal load, the outer burner cap combustion unit includes at least two blowers, so that a blower with a smaller power can be used for a single blower to reduce the noise and electrical safety during the operation of the blower.

[0047] (9) The blower can be a DC blower. The DC blower uses a DC brushless motor. The DC brushless motor has a high speed, good linear regulation of the speed, and accurate adjustment of the air volume and air speed. It can accurately match the gas volume at each gear of the cock valve to ensure accurate combustion of the burner at each gear. In addition, the DC brushless motor has low noise. At the same time, due to the small adapted electric power, the burner can use a safety voltage through an adapter, effectively improving the use safety.

[0048] (10) When the combustion appliance is a commercial gas stove, the gas stove includes a bottom shell. A through burner installation through-hole is opened on the bottom surface of the bottom shell. A plurality of supporting feet are provided at intervals along the burner installation through-hole on the edge of the burner installation through-hole. The burner is fixedly mounted on the supporting feet, and the supporting feet suspend the burner. Since the contact surface between the burner and the bottom shell is small, the heat transfer of the burner downward is less, the heat loss is reduced, and at the same time, the temperature rise of the non-heating area is reduced.

[0049] (11) The burner is also provided with a temperature control device. When the temperature in the mixing chamber is too high, the temperature control device automatically closes the self-extinguishing valve, stops supplying gas, blocks combustion, realizes overheat protection, and improves the safety of using the burner. When the burner is just started in the cold state, by controlling the air supply amount of the blower, insufficient air is supplied for combustion at the beginning of startup. When the burner is preheated to a certain temperature, sufficient air is supplied to avoid flame detachment when the burner is just started in the cold state. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0051] Figure 1 Structural schematic diagram of the burner in an embodiment of the present invention;

[0052] Figure 2 is Figure 1 Side view of the burner in;

[0053] Figure 3 is Figure 1 Cross-sectional view of the burner in;

[0054] Figure 4 Structural schematic diagram of the burner in another embodiment of the present invention;

[0055] Figure 5 is Figure 4 Top view of the burner in;

[0056] Figure 6 is Figure 4 Side view of the burner in;

[0057] Figure 7 is Figure 4 Cross-sectional view of the burner in;

[0058] Figure 8 is Figure 1 Exploded view of the structure of the burner in;

[0059] Figure 9 is Figure 4 Exploded view of the structure of the burner in;

[0060] Figure 10 is Figure 4 Structural schematic diagram of the outer fire cover of the burner relative to the outside;

[0061] Figure 11 isFigure 4 Schematic diagram of the outer fire cover relative to the inner side of the middle burner;

[0062] Figure 12 Schematic diagram of the burner bottom plate in an embodiment;

[0063] Figure 13 Schematic diagram of the burner bottom plate in another embodiment;

[0064] Figure 14 Schematic diagram of the connecting ring in an embodiment;

[0065] Figure 15 Exploded view of the outer fire cover in an embodiment;

[0066] Figure 16 For Figure 15 Cross-sectional view of the outer fire cover;

[0067] Figure 17 For Figure 16 Enlarged view at E;

[0068] Figure 18 Exploded view of the outer fire cover in another embodiment;

[0069] Figure 19 For Figure 18 Cross-sectional view of the outer fire cover;

[0070] Figure 20 For Figure 19 Enlarged view at F;

[0071] Figure 21 Schematic diagram of the fire outlet assembly in an embodiment;

[0072] Figure 22 Cross-sectional view of the burner in an embodiment;

[0073] Figure 23 Partial cross-sectional view of the gas stove in an embodiment;

[0074] Figure 24 Exploded view of the gas stove in an embodiment. Specific implementation manners

[0075] By providing a burner and a combustion appliance containing the same in the embodiments of the present application, the technical problems in the prior art that the burner of the commercial combustion appliance has high noise, low safety, high cost and a small heat load adjustment range are solved.

[0076] The technical solutions in the embodiments of the present application for solving the above technical problems are generally as follows:

[0077] The burner includes at least one outer burner cap combustion unit. When the number of the outer burner cap combustion units exceeds one, the adjacent outer burner cap combustion units are arranged in a nested manner with different inner and outer sizes. Therefore, various outer burner cap combustion units with different heat loads (powers) can be prefabricated modularly. Later, according to the total heat load requirement, the types and numbers of the outer burner cap combustion units can be flexibly selected and assembled into the burner, which has a wide heat load adjustment range, can adapt to various heat loads, and has strong versatility. In addition, the burner can adjust the rotation speed of the air intake power equipment according to the size of the gas intake, accurately provide the primary air volume, and at the same time limit the primary air volume by setting an air chamber to ensure the accurate combustion of the burner, that is, it can burn fully, has a low excess air coefficient, reduces noise, improves the use experience, produces less flue gas, and increases the flue gas temperature, thereby improving the heat transfer efficiency. At the same time, the burner is provided with an air chamber for limiting the primary air, and the gas can be adjusted in gears through a cock valve to cooperate with the accurate ratio of air to gas to achieve full combustion. Since the cock valve is inexpensive (generally dozens of yuan) and is a mature standard product with high safety, the burner has a low cost and high safety. Therefore, the embodiments of the present application effectively solve the technical problems of high noise, high danger, high cost, and small heat load adjustment range in the prior art of commercial gas stoves, and achieve the beneficial effects of low noise, low cost, high safety, high thermal efficiency, and flexible heat load adjustment.

[0078] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings of the specification and specific implementation manners.

[0079] In one or more embodiments of the present application, a burner a is provided, which is a device for mixing and burning gas and can be used in commercial gas combustion appliances. Of course, in other embodiments, this device can also be used in household gas stoves or other occasions where a burner is required, and is not limited here.

[0080] It should be noted that a burner generally includes an outer burner cap combustion system and an inner burner cap combustion system. Among them, the outer burner cap combustion system includes an outer burner cap and related components for supplying air and gas to the outer burner cap, and the inner burner cap combustion system includes an inner burner cap and related components for supplying air and gas to the inner burner cap; the outer burner cap refers to the peripheral burner cap, also known as the large burner cap, and the inner burner cap refers to the burner cap arranged at the center of the outer burner cap, also known as the small burner cap; during combustion, the outer burner cap combustion system forms a large fire at the outer burner cap, which is the main heat source of the burner; the inner burner cap combustion system forms a small fire at the inner burner cap, also known as the pilot light.

[0081] Such as Figures 1 to 7As shown, a burner a provided by an embodiment of the present application includes at least one outer fire cap combustion unit. When the number of the outer fire cap combustion units exceeds one, the outer fire cap combustion unit located relatively inside is less than the outer fire cap combustion unit located relatively outside, and the adjacent outer fire cap combustion units are arranged in a nested manner with the inner and outer sizes corresponding to each other;

[0082] For example, as Figures 1 - 3 shown, the burner includes one outer fire cap combustion unit, and this outer fire cap combustion unit independently forms the outer fire cap combustion system of the burner a. As Figures 4 - 7 shown, the burner includes two outer fire cap combustion units, and these two outer fire cap combustion units are combined to form the outer fire cap combustion system of the burner a. Of course, in other embodiments, the burner a may also include 3 or more outer fire cap combustion units, which is not limited herein.

[0083] Still as Figures 1 to 7 shown, the outer fire cap combustion unit includes an outer fire cap 100, and an outer fire outlet hole 130 is formed on the outer fire cap 100; the outer fire cap combustion unit further includes an air chamber d and a mixing chamber c. The air chamber d is connected to an air intake power device (for example, it can be a blower 210). One end of the mixing chamber c is communicated with both the air chamber d and an outer nozzle 230 for supplying gas, and the other end is communicated with the outer fire outlet hole 130; the air chamber d defines primary air, so that the primary air therein and the gas are premixed in the mixing chamber c according to a selected ratio and then supplied to the outer fire outlet hole 130 of the same outer fire cap combustion unit for combustion.

[0084] Specifically, the selected ratio generally refers to the ratio of the amounts of air and gas that can achieve complete combustion after mixing.

[0085] As can be seen from the above description, the burner a according to the embodiment of the present application includes at least one outer fire cover combustion unit. When the number of the outer fire cover combustion units exceeds one, the inner and outer sizes of adjacent outer fire cover combustion units are nested with each other. Therefore, various types of outer fire cover combustion units with different heat loads (powers) can be prefabricated modularly. Later, according to the total heat load requirement, the types and numbers of the outer fire cover combustion units can be flexibly selected and assembled into the burner a, which has a wide heat load adjustment range, can adapt to various heat loads, and has strong versatility. In addition, the burner a can adjust the rotation speed of the air intake power device according to the size of the gas intake, accurately provide the primary air volume, and at the same time limit the primary air volume by setting the air chamber d, ensuring that the burner a burns precisely, that is, it can burn fully, has a low excess air coefficient, reduces noise, improves the use experience, produces less flue gas, and increases the flue gas temperature, thereby improving the heat transfer efficiency. At the same time, the burner a is provided with an air chamber d for limiting the primary air. The gas can be adjusted in gears through the cock valve 940 to cooperate to achieve the precise ratio of air to gas and realize full combustion. Since the cock valve 940 is inexpensive (generally dozens of yuan) and the cock valve 940 is a mature standard product with high safety, the burner a has a low cost and high safety. Therefore, the embodiment of the present application effectively solves the technical problems of high noise, high danger, high cost and small heat load adjustment range in the prior art of commercial gas stoves, and realizes the beneficial effects of low noise, low cost, high safety, high thermal efficiency and flexible heat load adjustment.

[0086] In addition, the burner a according to the embodiment of the present application is made by prefabricating the outer fire cover combustion unit modularly in advance and then assembling it centrally according to needs. It has flexible assembly and strong versatility. This production method can more flexibly meet the market demand, reduce product backlog and losses, and does not require repeated mold opening, having a wide application prospect. At the same time, by combining modular outer fire cover combustion units to jointly meet the heat load requirement, compared with setting a single outer fire cover combustion system to achieve, since the primary air volume of a single outer fire cover combustion unit is relatively small, it is easy to accurately control, the uniformity of the air-gas mixture is better, and it is easier to achieve full combustion, thereby reducing noise and heat loss.

[0087] In addition, the burner a in this embodiment only includes two chambers, namely an air chamber d and a mixing chamber c, and there is no need to set an injector. Compared with the existing blow - type burner which includes three chambers, namely an air chamber (where air enters), a rotating air chamber (where the injector cooperates with the nozzle), and a mixing chamber (where air and gas are mixed), and is provided with an injector, the structure is more compact and the production cost is lower. Although this embodiment only includes two chambers, namely an air chamber d and a mixing chamber, since the mixing chamber in the embodiment of the present application is formed by the cooperation of an outer cylinder, it can be set relatively large, so that air and gas can be fully mixed in the mixing chamber. And because the air enters in a blow - type manner, the air has sufficient initial pressure to enter the mixing chamber, and there is no need to additionally set an injector to eject air into the mixing chamber by gas.

[0088] It should be noted that the air intake power device refers to a device that can actively supplement air into the air chamber d. In addition to the blower 210, other power devices that can achieve the corresponding function can also be used, and there is no limitation here. In addition, the air chamber d defines primary air, which means that the primary air provided by the blower 210 is all contained in the air chamber d without overflowing, and is only used to be provided to the mixing chamber c, so as to ensure an accurate amount of primary air provided to the mixing chamber c.

[0089] The cock valve 940 includes a valve body and a valve core rotatably arranged in the valve body. The cock valve 940 can be provided with multiple gas paths. When a dual - gas path is set, the valve body is provided with an air inlet, a main air outlet, and a secondary air outlet. The air inlet is used to connect to a gas source (such as a municipal gas pipe or a gas tank, etc.), the main air outlet is used to communicate with each outer nozzle 230, and the secondary air outlet is used to communicate with the inner nozzle 740. When the valve core rotates, the flow rate of the main air outlet will change in size according to a predetermined rule, so as to adjust the gas volume. The cock valve 940 used in this gas stove needs to meet the requirement of accurate gear adjustment to accurately provide the gas volume, so as to ensure that the burner a burns fully and has a low excess air coefficient. For example, the cock valve 940 developed by the applicant and recorded in the patent application with the application number 202210233252.3 (the invention creation name is: cock valve 940 and gas stove containing the same) can meet this requirement. However, since this cock valve 940 does not belong to the scope of protection required by the embodiment of the present invention, it will not be elaborated here. Of course, any other cock valve 940 that can achieve this function and is adaptable can also be used in the forced - draft gas stove of the embodiment of the present invention, and there is no limitation here.

[0090] Of course, to accurately provide the gas volume, the gas pressure also needs to be kept stable. Therefore, a pressure - stabilizing valve must be provided in the gas pipe. The setting of the pressure - stabilizing valve belongs to the prior art and does not belong to the scope of protection required by the embodiment of the present invention, so it will not be elaborated here.

[0091] In an embodiment of the present application, as Figure 3As shown in

[0092] Specifically, still as shown in Figure 6 or

[0093] 7, in addition to the outer fire cap combustion system formed by combining each outer fire cap combustion unit, the burner a of this application can also be provided with an inner fire cap combustion system. The inner fire cap combustion system includes an inner fire cap 600. The outer nozzle bottom plate 520 is annular, such as a circular ring. An inner nozzle bottom plate mounting hole for embedding the inner nozzle bottom plate 730 is formed in the center of the outer nozzle bottom plate 520. An outer nozzle 230 is provided on the outer nozzle bottom plate 520. An inner nozzle 740, an ignition needle 720, and a probe 710 are fixed on the inner nozzle bottom plate 730. Corresponding first inner nozzle holes 514, first ignition needle holes 517, and first probe holes 513 for the inner nozzle 740, the ignition needle 720, and the probe 710 to pass through are provided on the burner bottom plate 510. The outer peripheral wall of the inner nozzle bottom plate 730 seals the inner peripheral wall of the outer nozzle bottom plate 520 to form the sealed air chamber d. When the number of outer nozzles 230 in each outer fire cap combustion unit exceeds 1, the outer nozzles 230 can be arranged at intervals in the circumferential direction on the outer nozzle bottom plate 520 to uniformly introduce air. Each outer nozzle 230 is respectively connected to an outer gas pipe 410, the inner nozzle 230 is connected to an inner gas pipe 420, the outer gas pipe 410 is connected to the main air outlet of the cock valve 940, and the inner gas pipe 420 is connected to the secondary air outlet of the cock valve 940. Figure 6 or

[0094] It should be noted that for the convenience of description, in the embodiments of the present application, the center close to the outer fire cap (i.e., close to the inner fire cap 600) is defined as the inner side, and the center far from the outer fire cap 100 (i.e., far from the inner fire cap 600) is defined as the outer side. Then, the "relatively inner side" refers to the position relatively closer to the inner layer, that is, relatively closer to the inner fire cap 600, and the "relatively outer side" refers to the position relatively farther from the inner layer, that is, relatively farther from the inner fire cap 600. In addition, in the embodiments of the present application, the direction where the outer fire cap 100 is located is defined as the upper side, and the direction where the outer nozzle bottom plate 520 is located is defined as the lower side. The above direction definitions are only for the convenience of description and do not limit the protection scope of the embodiments of the present application.

[0095] In some embodiments of the present application, as Figures 8 - 11 shown, the outer fire cap of the outer fire cap combustion unit includes an outer cylinder body 10. At least one fire outlet ring 110, 120 extending into the outer cylinder body 10 is formed on the outer cylinder body 10, and the outer fire outlet holes 130 are arranged on the fire outlet rings 110, 120.

[0096] The burner a further includes a seal arranged at the center of the innermost outer fire cap combustion unit. The inner wall surface of the outer cylinder body 10, the seal, and the fire outlet rings 110, 120 between the outer cylinder body 10 and the seal enclose a mixing chamber of the innermost outer fire cap combustion unit on the top surface of the burner bottom plate 510.

[0097] When the inner fire cap 600 needs to be arranged on the burner, the seal is an inner cylinder body 760. The inner cylinder body 760 is arranged at the center of the innermost fire outlet ring 110 of the burner a and is arranged on the burner bottom plate 510. The inner cylinder body 760 forms a space for accommodating the inner fire cap 600, and a second ignition needle hole and a second probe hole for the ignition needle 720 and the probe 710 to pass through are opened on the bottom of the inner cylinder body 760. The inner wall surface of the outer cylinder body 10, the outer wall surface of the inner cylinder body 760, and the middle fire outlet rings 110, 120 enclose a mixing chamber c of the innermost outer fire cap combustion unit of the burner a on the top surface of the burner bottom plate 510. However, in some other embodiments, if the inner fire cap 600 does not need to be arranged, the seal can be a sealing sheet sealed and laid at the bottom of the innermost fire outlet ring 110.

[0098] When the number of the outer fire cap combustion units exceeds one, the adjacent outer fire cap combustion units are in clearance fit, and the outer cylinder body 10 between the adjacent outer fire cap combustion units and the fire outlet rings 110, 120 of the relatively outer outer fire cap combustion unit enclose a mixing chamber c of the relatively outer outer fire cap combustion unit on the top surface of the burner bottom plate 510.

[0099] Specifically, the outer cylinder body 10 is located on the outer peripheries of the fire outlet rings 110 and 120, and the arrangement where the outer cylinder body covers the burner base plate 510 can form a relatively large and high mixing chamber c, thus facilitating the full mixing of air and gas in the mixing chamber c. The outer cylinder body 10 and the inner cylinder body 760 can be coaxial cylinders, and the volume of the mixing chamber c needs to be determined according to the heat load borne by the outer fire cap combustion unit. The greater the heat load, the larger the volume of the mixing chamber c needs to be set, and vice versa. Then, the sizes of the outer cylinder body 10 and the inner cylinder body 760 can be set accordingly.

[0100] As can be seen from the above description, within the same outer fire cap combustion unit, the mixing chamber c is located directly above the air chamber d and is adjacent to it vertically, thereby reducing the resistance for the gas in the air chamber d to enter the mixing chamber c.

[0101] In some embodiments of the present application, as Figure 3 , 7 shown, the outer fire cap combustion unit further includes a mixing pipe 240 for communicating the mixing chamber c and the air chamber d of the same outer fire cap combustion unit, and the mixing pipe 240 is disposed through the burner base plate 510. For example, as Figure 8 , 9 shown, a vertically through mixing pipe through hole 511 is formed on the burner base plate 510, and the mixing pipe 240 is fixedly inserted into the mixing pipe through hole 511.

[0102] Within the same outer fire cap combustion unit, the outer nozzle 230 passes through the outer nozzle base plate 520 and extends into the air chamber d, and the gas ejected from the outer nozzle 230 and the air in the air chamber d jointly enter the mixing chamber c through the mixing pipe 240. A small part of the gas ejected from the outer nozzle 230 will diffuse in the air chamber d, but finally it will enter the mixing chamber c together with the primary air in the air chamber d through the mixing pipe 240 for full mixing.

[0103] Within the same outer fire cap combustion unit, the number of mixing pipes 240 is not less than the number of outer nozzles 230, and each outer nozzle 230 is disposed adjacent to at least one mixing pipe 240 to ensure that the gas ejected from the outer nozzle 230 efficiently enters the mixing chamber c for mixing and combustion, that is: when the number of mixing pipes 240 is equal to the number of outer nozzles 230, the mixing pipes 240 and the outer nozzles 230 are arranged in one-to-one correspondence; when the number of mixing pipes 240 is more than the number of outer nozzles 230, at least one outer nozzle 230 corresponds to two mixing pipes 240. For example, in the embodiment shown in Figure 8 or 9, any outer fire cap combustion unit has two spaced outer nozzles 230 and two corresponding mixing pipes 240.

[0104] The gas combustion appliance includes a heating zone and a non-heating zone. The temperature of the heating zone is high, and the temperature of the non-heating zone is low to improve the thermal efficiency. For example, a gas stove includes a burner a, a cooking surface, a knob, etc. Among them, the burner a is the heating zone, and the cooking surface, the knob, the interior of the stove, etc. are non-heating zones. For an ideal gas stove, the temperature of the heating zone is high, and the heat transfer efficiency to the bottom of the pot is high; while the temperature of the non-heating zone is less affected by the heating zone and is low.

[0105] To further improve the thermal efficiency and reduce the temperature rise of the non-heating zone, please refer to Figure 3 、 Figures 7 - 9 In some embodiments, a guide plate 310 is provided at the outlet of the mixing tube 240. The fixed end of the guide plate 310 is fixed on the burner bottom plate 510, and the free end is located above the outlet of the mixing tube 240 and extends along the inner peripheral wall of the mixing chamber c to guide air and gas to spiral into the mixing chamber c in one direction (clockwise or counterclockwise). The rotating air flow absorbs the heat transferred downward during the combustion of the burner a and quickly returns to the outer burner cap, so that the heat returns to the heating zone. On the one hand, it reduces the heat transfer from the heating zone to the non-heating zone, reduces the temperature rise of the non-heating zone, and improves the user experience; on the other hand, it reduces the heat loss in the heating zone and further improves the thermal efficiency; in addition, the spiral intake increases the rotational kinetic energy of the air and gas entering through the mixing tube, thereby making the air and gas mix evenly.

[0106] Specifically, the inlet end of the mixing tube 240 is located in the air chamber d and is in communication with the air chamber d. The outlet of the mixing tube 240 is in communication with the mixing chamber c, and the outlet of the mixing tube 240 is flush with the burner bottom plate 510 to facilitate the setting of the guide plate 310. And the fixed end of the guide plate 310 is fixed on the burner bottom plate 510 by a first screw 311.

[0107] The gas is ejected from the outer nozzle 230 and enters the mixing chamber c through the mixing tube 240 with high flow efficiency. To improve the efficiency of air entering the mixing chamber c for using a low-power blower to reduce the noise of the blower and improve the electrical safety, in some embodiments of the present application, as Figure 12 shown, the outer burner cap combustion unit further includes a first air through hole 512 for communicating the mixing chamber c and the air chamber d of the same outer burner cap combustion unit. The first air through hole 512 is opened on the burner bottom plate 510 to increase the path for the primary air in the air chamber d to enter the mixing chamber c.

[0108] In some embodiments of the present application, the first air through-hole 512 is disposed adjacent to a mixing tube 240, such that the first air through-hole 512 is located below a guide plate 310 of the mixing tube 240, thereby sharing the same guide plate 310, reducing the design of an additional guiding structure for the first air through-hole 512, thereby reducing the occupation of the space of the mixing chamber c and the production cost of the burner a.

[0109] Alternatively, in some other embodiments, as Figure 13 shown, to improve the efficiency of air entering the mixing chamber c, so as to use a low-power blower to reduce the noise of the blower and improve the electrical safety, the outer fire cap combustion unit further includes a second air through-hole 516 for communicating the mixing chamber c and the air chamber d of the same outer fire cap combustion unit. The second air through-holes 516 are circumferentially spaced apart on the burner base plate 510 along the circumference of the mixing chamber c, and at least a part of the second air through-holes 516 are provided with enclosing covers 517 along the same side of the circumference of the mixing chamber c. Each enclosing cover 517 defines that the air of the second air through-hole 516 spirally enters the mixing chamber c in the same direction (clockwise or counterclockwise), so as to produce the same effect as the guide plate 310.

[0110] Specifically, the enclosing cover 517 covers the second air through-hole 516. The surface of the enclosing cover 517 facing the second air through-hole 516 is a curved surface, and a notch allowing air to pass through is formed on one side of the enclosing cover 517. The notches on each of the second air through-holes 516 are formed in the same direction (clockwise or counterclockwise), thereby guiding the air to spirally enter the mixing chamber c from the second air through-hole 516 in the same direction (clockwise or counterclockwise).

[0111] Certainly, in some embodiments, to improve the efficiency of air entering the mixing chamber c, the first air through-hole 512 and the second air through-hole 516 may be simultaneously provided on the burner base plate 510, which is not limited herein and is subject to specific requirements.

[0112] Furthermore, as Figure 3 、 7 shown, the outer fire cap includes at least two fire outlet rings 110, 120 that are gradually downward from the outer cylinder 10 towards the center of the outer cylinder 10. The outer fire outlet holes 130 on each of the fire outlet rings 110, 120 are all opened towards the inside of the outer cylinder 10, and the outer fire outlet holes 130 on the same fire outlet ring 110, 120 form a fire outlet surface. Then, the outer fire cap 100 forms a plurality of stepped fire outlet surfaces that gradually shrink and descend from the inner circumferential surface of the outer cylinder 10 towards the center of the outer cylinder 10; and the adjacent fire outlet rings 110, 120 in the same outer fire cap combustion unit are connected by a connecting ring 40 to seal the gap between the adjacent fire outlet rings 110, 120, so as to seal the mixing chamber c.

[0113] Specifically, as Figure 14 shown, the connecting ring 40 includes a body, an upper connecting ring 41 connected to the upper surface of the body, and a lower connecting ring 42 connected to the lower end surface of the body. The upper connecting ring 41 and the lower connecting ring 42 are respectively connected to two adjacent flame outlets 110 and 120 within the same outer burner cap. Between two adjacent outer burner cap combustion units, the position of the outer flame outlet 130 of the relatively outer outer burner cap combustion unit is higher than the position of the outer flame outlet 130 of the relatively inner outer burner cap combustion unit, so as to prevent the outer flame outlet 130 of the relatively inner outer burner cap combustion unit from blocking the outer flame outlet 130 of the relatively outer outer burner cap combustion unit.

[0114] Since the outer burner cap 100 of the embodiment of the present application relies on the blower 210 to supplement primary air and does not need to consider the air source other than the blower 210, the outer flame outlet 130 is opened inward, which will not affect the actual use of the outer burner cap 100. At the same time, opening the outer flame outlet 130 into the outer cylinder 10, compared with the traditional burner a where the outer flame outlet 130 is arranged on the outer peripheral surface of the outer burner cap, the flames between adjacent outer flame outlets all burn inward and are more likely to intersect, so that the flames between adjacent outer flame outlets can ignite each other, and there is no need to set up a lapping ignition structure, which simplifies the structure of the outer burner cap 100, reduces the processing difficulty and the processing cost.

[0115] In addition, in the combustion state, the outer flame outlets 130 on the outer burner cap 100 are arranged inward, and the flames between adjacent outer flame outlets 130 intersect, so that the flames between adjacent outer flame outlets 130 can stabilize each other, thus effectively preventing flame lift; in addition, the outer flame outlets 130 on the outer burner cap 100 are arranged inward and can be directly ignited by the inner flame outlets 610 on the ignited inner burner cap 600, without the need to additionally set up flame transfer holes. As Figure 3 shown, an ignition needle 720 is arranged between the outer burner cap 100 and the inner burner cap 600. During ignition, after the inner flame outlets 610 on the inner burner cap 600 are ignited by the ignition needle 720, since the outer flame outlets 130 on the outer burner cap 100 face the inner burner cap 600, they can be directly ignited. Finally, the outer flame outlets 130 on the outer burner cap 100 all burn inward, which can effectively reduce heat dissipation to the outside, has the beneficial effect of high thermal efficiency, and can effectively reduce the temperature rise in the non-heating areas (such as the tabletop, the knob, and the inside of the cooker), improving the user experience.

[0116] In addition, the outer burner cap 100 of the embodiment of the present application is composed of a series of flame outlets combined together, and various sizes of flame outlets that match each other can be prefabricated modularly. Later, according to the heat load requirements, the number of flame outlets can be flexibly selected and assembled into the outer burner cap 100, which has the function of adjusting the heat load.

[0117] Furthermore, as Figures 10 - 20As shown, an annular end face 11 extending into the outer cylinder body 10 is provided on the top surface of the outer cylinder body 10. The outfire rings 120 on the relatively outer sides within the same outer burner cap combustion unit are fixed on the upper surface or the lower surface of the annular end face 11, and the adjacent outfire rings 110 and 120 are connected by a connecting ring 40, thereby realizing the mutual fixation between the outfire rings 110, 12 and the outer cylinder body 10;

[0118] Each of the outfire rings 110, 120 at least includes an outfire plate layer, and each outfire plate layer at least includes an outfire plate 20. The inner edge of the outfire plate 20 is recessed outward at intervals to form a plurality of outfire grooves 21 with the notch facing the center of the outfire plate 20;

[0119] A cover 50, a gasket layer or the annular end face 11 is provided above each outfire plate layer, and a gasket layer or the annular end face 11 is provided below each outfire plate layer. Each gasket layer at least includes a gasket 30; the outfire grooves 21 within the same outfire plate layer are vertically aligned, and together with the cover 50, the gasket layer or the annular end face 11 adjacent above, and the gasket layer or the annular end face 11 adjacent below, they enclose a layer of outer outfire holes 130, and the outer outfire holes 130 within the same layer are arranged at intervals along the circumferential direction and enclose a circle.

[0120] Each of the outer outfire holes 130 is communicated with an independent vertical air inlet channel, and the vertical air inlet channel is communicated with the mixing chamber c of the same outer burner cap combustion unit. With such a setting, each outer outfire hole 130 intakes air separately, which can ensure that the outer outfire holes 130 work independently of each other without interference, thereby making the flame stable, and the entire outer burner cap forms a honeycomb structure.

[0121] In addition, the outfire grooves 21 on the outfire plate 20 are distributed in a rotational manner in the counterclockwise direction. The rotational distribution means that the groove length direction of the outfire grooves 21 on each outfire plate 20 intersects with the radial direction of the outfire plate 20 where it is located, that is, from a top view angle, the groove length direction of the outfire groove 21 does not pass through the center of the outfire plate 20 where it is located, and the rotational angle of the outfire groove 21 is 5° to 20°.

[0122] Furthermore, the vertical air inlet channel corresponding to any one of the outer outfire holes 130 is arranged below the corresponding outer outfire hole 130. The top end of the vertical air inlet channel is communicated with the corresponding outer outfire hole 130, and the bottom end of the vertical air inlet channel extends to be communicated with the mixing chamber c; and the vertical air inlet channel is formed by the upper and lower through - connection of the air inlet through - holes and / or outfire grooves 21 opened on the gasket layer, outfire plate layer, annular end face 11 and / or connecting ring 40 located below the corresponding outer outfire hole 130.

[0123] Specifically, such as Figure 15 、 18As shown in the figure, the flame outlet piece 20, the cover 50, and the gasket 30 are annular, for example, circular. Within the same flame outlet circles 110 and 120, the outer diameters of the flame outlet piece 20, the cover 50, the gasket 30, the annular end face 11, and the connecting ring 40 are respectively equal, and the inner diameters of the flame outlet piece 20, the cover 50, the gasket 30, the annular end face 11, and the connecting ring 40 are respectively equal, so as to respectively form the outer peripheral wall and the inner peripheral wall of the flat flame outlet circles 110 and 120. And within the same flame outlet circles 110 and 120, a number of first rivet holes are provided at corresponding positions on the upper connecting ring 41 of the flame outlet piece 20, the cover 50, the gasket 30, the annular end face 11, and / or the lower connecting ring 42 of the connecting ring 40. The rivet holes within the same flame outlet circles 110 and 120 are vertically aligned and fixed by rivets 70, so as to be vertically fixed to form a flame outlet circle 110 and 120.

[0124] Specifically, the outer end of the flame outlet groove 21 is closed, the inner end is a notch, and the flame outlet groove 21 penetrates up and down. The shapes and sizes of the flame outlet pieces 20 within the same flame outlet piece layer are completely the same, and the flame outlet grooves 21 within the same flame outlet piece layer are vertically aligned and penetrate. The shapes and sizes of the gaskets 30 within the same gasket layer are completely the same, and a number of first air inlet through holes 31 are provided at intervals along the circumferential direction of the gasket 30.

[0125] The flame outlet piece 20 at the topmost surface of the flame outlet circles 110 and 120 needs to be sealed with the cover 50. When the outermost flame outlet circle 120 within the same outer fire cover combustion unit is fixed on the upper surface of the annular end face 11, the annular end face 11 acts as the gasket 30, as Figure 10 shown; when the relatively outer flame outlet circle 120 within the same outer fire cover combustion unit is fixed on the lower surface of the annular end face 11, the annular end face 11 acts as the cover 50, as Figure 12 shown.

[0126] The upper connecting ring 41 of the connecting ring 40 is used to connect the relatively outer flame outlet circle 120, generally located at the lower part of the relatively outer flame outlet circle 120, acts as the gasket 30, and second air inlet through holes 44 corresponding to the first air inlet through holes 31 on the adjacent gasket 30 can be provided thereon. The lower connecting ring 42 of the connecting ring 40 is used to connect the relatively inner flame outlet circle 110, generally located at the upper part of the relatively inner flame outlet circle 110, acts as the flame outlet piece 20, and a connecting ring flame outlet groove 43 can be provided thereon corresponding to the flame outlet groove 21 on the adjacent flame outlet piece 20.

[0127] As can be seen from the above description, the outer fire cover 100 of the embodiment of the present application is a sheet metal fire cover assembled from a plurality of fire outlet sheets, gaskets 30, caps 50, and connecting rings 40. The fire outlet sheets, gaskets 30, caps 50, and connecting rings 40 are produced modularly, and then the outer fire cover 100 is assembled according to specific needs. By adjusting the number of layers of the fire outlet sheets, the number of layers of the fire outlet holes can be changed. By adjusting the number of fire outlet sheets 20 within the fire outlet sheet layer, the fire outlet area of the outer fire outlet holes 130 can be adjusted. By adjusting the number of gasket layers, the distance between the upper and lower layers of the outer fire outlet holes 130 can be adjusted. By adjusting the inner diameter of the fire outlet ring, the degree of flame dispersion can be adjusted, and multiple combinations can be combined to adapt to different heat loads (powers), realizing fine adjustment of heat load regulation. Combined with the adjustment of the type and number of the outer fire cover combustion units and the adjustment of the number of the outer fire cover fire outlet rings, the burner described in this embodiment has a wider and more delicate possibility of heat load regulation, can adapt to a variety of heat loads, and has strong versatility.

[0128] In addition, the outer fire cover 100 of the embodiment of the present application is made by pre-modularly producing fire outlet sheets, gaskets 30, caps 50, and connecting rings 40, and then centrally assembled according to needs. The assembly is flexible and the versatility is strong. This production method can more flexibly respond to market demands, reduce product backlogs and losses, does not require repeated mold opening, and at the same time has less material waste, and has a wide application prospect.

[0129] When the outermost fire outlet ring 120 in the same outer fire cover combustion unit is fixed on the lower surface of the annular end face 11, the outer peripheral surface of the fire outlet ring 120 is located in the mixing chamber c, and the first air inlet through hole 31 faces the mixing chamber c and opens to communicate with the mixing chamber c to form the lateral air inlet channel a of the outer fire outlet hole 130. The lateral air inlet channel a is communicated with the longitudinal air inlet channel, and the lateral air inlet channel a can supply air and gas to the outer fire outlet hole 130. Therefore, the number of layers of the outer fire outlet holes 130 is only limited by the size of the mixing chamber c itself, and there is no need to worry about the situation that the air pressure of the outer fire outlet holes 130 located above is insufficient due to being too high. On the contrary, when the outermost fire outlet ring 120 in the same outer fire cover combustion unit is fixed on the upper surface of the annular end face 11, the number of layers of the outer fire outlet holes 130 is not limited by the size of the mixing chamber c, but it is necessary to consider whether the air pressure of the outer fire outlet holes 130 located above is sufficient.

[0130] It should be noted that in the embodiment of the present application, the lateral direction refers to the diameter direction of the outer fire cover 100, and the longitudinal direction refers to the axial direction of the outer fire cover 100.

[0131] In Figures 15 - 17 , Figure 21In one embodiment shown, the outer burner cap includes two flame outlets 110 and 120, namely the relatively inner flame outlet 110 and the relatively outer flame outlet 120. The relatively outer flame outlet 120 is disposed on the upper surface of the annular end face 11 of the outer cylinder 10. Its specific structure is as follows:

[0132] The relatively outer flame outlet 120 successively includes a cover 50, a flame outlet piece 20, a gasket 30, a flame outlet piece 20, a gasket 30, an upper connecting piece 41, and the annular end face 11 of the outer cylinder from top to bottom. The upper connecting piece 41 is provided with a second air inlet through hole 45 communicating with the first air inlet through hole 31 on the adjacent gasket 30. The annular end face 11 of the outer cylinder 10 is provided with a third air inlet through hole communicating with the second air inlet through hole 45 on the gasket 30. The notch of the flame outlet groove 21 on any flame outlet piece 20 and the cover 50 or gasket 30 above, as well as the gasket, upper connecting piece 41 and the annular end face of the outer cylinder below enclose an outer flame outlet hole 130. And the outer end of the flame outlet groove 21 below any outer flame outlet hole 130, the first air inlet through hole 31, the second air inlet through hole 45 and the third air inlet through hole are vertically communicated to form a vertical air inlet channel and communicate with the mixing chamber c.

[0133] Still as Figures 15 - 17 , Figure 21 shown, the relatively inner flame outlet 110 successively includes a cover 50, a flame outlet piece 20, a lower connecting ring 42, 6 flame outlet assemblies m formed by stacking one gasket 30 above and one flame outlet piece 20 below, and a gasket layer formed by stacking three gaskets 30 from top to bottom. The lower connecting ring 42 is provided with a connecting ring flame outlet groove 43. The notch of the flame outlet groove 21 on any flame outlet piece 20 and the cover 50 or gasket 30 above, as well as the gasket below enclose an outer flame outlet hole 130. And the outer end of the flame outlet groove 21 below any outer flame outlet hole 130, the connecting ring flame outlet groove 43, and the first air inlet through hole 31 are vertically communicated to form a vertical air inlet channel and communicate with the mixing chamber c.

[0134] In another embodiment, as Figures 18 - 20 , Figure 21 shown, the relatively outer flame outlet 120 is disposed on the lower surface of the annular end face 11 of the outer cylinder 10. The annular end face 11 serves as the cover 50 of the relatively outer flame outlet 120. The specific setting structure is as follows:

[0135] The relatively outer fire outlet ring 120 includes an annular end face 11 arranged successively from top to bottom, m fire outlet assemblies formed by stacking 8 fire outlet pieces 20 above and 1 gasket 30 below, a gasket layer formed by stacking 4 gaskets 30, and an upper connection ring 41 of the connecting piece 40. The notch of the fire outlet groove 21 on any fire outlet piece 20, the annular end face 11 or gasket above, and the gasket below enclose an outer fire outlet hole 130. The outer end of the fire outlet groove 21 below any outer fire outlet hole 130, the first air intake through hole 31, and the second air intake through hole 44 are vertically communicated to form a vertical air intake channel, which is communicated with the mixing chamber c; the part of the outer end of the fire outlet groove 21 of any outer fire outlet hole 130 that is not covered by the gasket 30 is horizontally communicated with the mixing chamber c to form a horizontal air intake channel. In addition, a second air intake through hole 44 opens outward on the outer peripheral wall of the upper connection ring 41, so as to be horizontally communicated with the mixing chamber c to form a horizontal air intake channel g.

[0136] Still as Figures 18 - 20 , Figure 21 shown, the relatively inner fire outlet ring 110 includes a cover 50, a fire outlet piece 20, a lower connection ring 42, m fire outlet assemblies formed by stacking 7 gaskets 30 above and 1 fire outlet piece 20 below, and a gasket layer formed by stacking 2 gaskets 30 from top to bottom. A connection ring fire outlet groove 43 is provided on the lower connection ring 42; the fire outlet groove 21 on any fire outlet piece 20, the cover 50 or gasket above, and the gasket below enclose an outer fire outlet hole 130. The outer end of the fire outlet groove 21 below any outer fire outlet hole 130, the connection ring fire outlet groove 43, and the first air intake through hole 31 are vertically communicated to form a vertical air intake channel, which is communicated with the mixing chamber c.

[0137] In the above embodiment, as Figures 15 - 17 shown, in order to have a clearance fit with the inner cylinder 760 or the adjacent outer cylinder 10, the bottom of the innermost fire outlet ring 110 in the outer fire cover 100 is further connected with a base 60. The base 60 is provided with a second rivet hole 62 corresponding to the first rivet hole, and a fourth air vent hole 61 communicated with the first air vent hole 31 on the gasket 30. A central through hole for clearance fit with the inner cylinder 760 or the relatively inner outer fire cover 100 is provided at the center of the base 60.

[0138] As Figure 8As shown in FIGS. 8 or 9, in some embodiments of the present application, the outer burner cap combustion unit further includes a sealing edge 515 for sealing the gap between the outer cylinder 10 and the burner base plate 510. The sealing edge 515 is fixed on the burner base plate 510 and extends closely along the inner bottom edge of the outer cylinder 100. Specifically, the sealing edge 515 is annular, and the sealing edge 515 is fixed on the burner base plate 510 by the second screw 320. The sealing edge 515 seals the connection gap between the outer cylinder 10 and the bottom end 510 of the burner a to prevent the primary air from overflowing.

[0139] Generally speaking, the inner - most outer burner cap combustion unit bears a relatively small heat load, and the outer - most outer burner cap combustion unit bears a relatively large heat load. To reduce the power of a single blower 210, thereby reducing noise and improving electrical safety, when the outer burner cap combustion unit bears a large heat load, the outer burner cap combustion unit includes at least two blowers 210. For example, in an embodiment of the present application, as Figure 9 shown, the burner a includes two outer burner cap combustion units. Each outer burner cap combustion unit is respectively provided with two blowers 210. The blowers 210 belonging to the relatively outer outer burner cap combustion unit are respectively communicated with the corresponding air chamber d. The blowers 210 belonging to the inner - layer outer burner cap combustion unit respectively penetrate through the air chamber d of the relatively outer outer burner cap combustion unit along the radial direction and then are communicated with the corresponding air chamber d. The blower through - holes 221 for the blowers 210 to pass through are formed on the enclosing edge 220. Each blower 210 is arranged radially along the air chamber d, which can reduce the occupation of the vertical space of the burner a and avoid the burner a from being too high.

[0140] Since the mixing chamber c and the air chamber d are adjacent up and down, the pressure loss of the air in the air chamber d entering the mixing chamber c is very small, and the air in the air chamber d has sufficient channels to enter the mixing chamber c, so that the efficiency of the air in the air chamber d entering the mixing chamber c is very high. In addition, when the outer burner cap combustion unit bears a large heat load, it includes at least two blowers 210, so that a single blower 210 can adopt a blower with a relatively small power to reduce the noise and electrical safety during the operation of the blower.

[0141] For example, in some embodiments of the present application, the blower 210 is a DC blower that uses a DC brushless motor. The DC brushless motor has a high rotational speed, and the adjustment of the wind speed and air volume is precise, which can accurately match the gas volume at each gear of the cock valve 940 to ensure precise combustion of the burner a at each gear. In addition, the DC brushless motor has a low noise. The blower used in the commercial gas burner a in the prior art is a strong electricity AC blower that uses a strong electricity AC motor (voltage of 220V), and the noise is very large. However, in this embodiment, the DC brushless motor is used, which not only greatly reduces the noise, but also, due to the small adapted electric power, the burner a described in this embodiment can use a safety voltage through an adapter, effectively improving the use safety. For example, in an embodiment of the present application, the power of the DC brushless motor is 10W, and its applicable voltage is 3 - 12V.

[0142] In an embodiment of the present application, as Figure 3 、 7 shown in FIGS. 6 - 9, the inner fire cover 600 is disposed inside the inner cylinder 760, and inner fire holes 610 are provided on the outer peripheral wall of the inner fire cover 600. The inner fire cover 600 is communicated with the inner nozzle 740 and the air chamber d through a lower small - fire connection seat 740 and an upper small - fire connection seat 750.

[0143] Specifically, the bottom end of the lower small - fire connection seat 740 is fixed on the lower inner nozzle 740 and is communicated with the inner nozzle 740. The top end of the lower small - fire connection seat 740 passes through the air chamber d and enters the inner cylinder 760. A lower small - fire connection seat hole for the lower small - fire connection seat 740 to pass through is provided on the bottom of the inner cylinder 760. The side of the lower small - fire connection seat 740 is communicated with the air chamber d. An upper small - fire connection seat 750 is provided on the lower small - fire connection seat 740. The inner fire cover 600 is disposed on the upper small - fire connection seat 750, and the lower small - fire connection seat 740, the upper small - fire connection seat 750, and the inner fire cover 600 are communicated with each other, so that the inner fire holes 610 on the inner fire cover 600 obtain gas and air through the upper small - fire connection seat 75 and the lower small - fire connection seat 740.

[0144] As Figure 3 、 Figures 7 - 9 shown in FIGS. 10 - 11, the upper small - fire connection seat 750 is in a through - ring shape, and internal threads are provided on the inner wall surface of the upper small - fire connection seat 750. The top end of the lower small - fire connection seat 740 and the upper small - fire connection seat 750 are screwed tightly together through the cooperation of external threads and internal threads.

[0145] The lower small-fire connecting seat 740 and the upper small-fire connecting seat 750 are hollow and connected inside to connect the inner nozzle 420 and the inner burner cap 600. The inner burner cap arranged on the upper small-fire connecting seat 750 obtains gas. At the same time, a plurality of lower small-fire connecting seat air inlets penetrating radially along the lower small-fire connecting seat 740 are formed on the outer peripheral wall of the lower small-fire connecting seat 740. The lower small-fire connecting seat air inlets are connected to the air chamber d. The inner burner cap arranged on the upper small-fire connecting seat 750 obtains primary air. The gas is ejected from the inner nozzle 420, enters the inner burner cap 600 together with the primary air in the air chamber d, and burns at the inner fire outlet holes 610 of the inner burner cap 600.

[0146] The burner a described in the embodiment of the present application can be used in combustion appliances, which can be commercial gas combustion appliances or household gas cookers. Due to its wide power adjustment range, it is especially suitable for commercial gas combustion appliances, such as commercial gas stoves.

[0147] When the combustion appliance is a commercial gas stove, as Figure 23 、 24 shown, the gas stove includes a bottom shell 900 and a panel 830. A bracket 910 is provided under the bottom shell 900 to support the bottom shell 900. The panel 830 is located on the bottom shell 900 and jointly defines a stove cavity with the bottom shell 900. A through burner installation through hole 920 is formed on the bottom surface of the bottom shell 900. A plurality of supporting feet 930 are arranged at intervals along the edge of the burner installation through hole 920. The burner a is fixedly mounted on the supporting feet 930. The burner a is located in the stove cavity, and the outer burner cap 100 of the burner a is exposed outside the panel 830. The supporting feet 930 suspend the burner a. Since the contact area between the burner a and the bottom shell 900 is small, the burner a transfers less heat downward, reducing heat loss and at the same time reducing the temperature rise in the non-heating area.

[0148] Specifically, the supporting foot 930 includes a first connecting member for connecting with the bottom shell 900 and a second connecting member for connecting with the burner a. The first connecting member and the second connecting member are connected by a supporting member. The first connecting member is fixed to the bottom shell 900 by bolts, and the second connecting member is fixedly connected to the burner bottom plate of the burner a by bolts.

[0149] The gas stove further includes a liquid receiving tray 820 and a pot support 910. The liquid receiving tray 820 is embedded in a liquid receiving tray through hole 831 on the panel 830. The burner a passes through the liquid receiving tray through hole 831. The liquid receiving tray 820 is used to receive food and liquid dropped during cooking to avoid polluting the stove cavity below. The pot support 910 is freely placed in the liquid receiving tray 820 and surrounds the outer periphery of the outer burner cap 100 of the burner a to support the pot body.

[0150] The gas stove further includes a cock valve 940. The inlet of the cock valve 940 is connected to a gas source through a gas pipeline. The main outlet of the cock valve 940 is connected to an external gas pipeline 410, and the secondary outlet of the cock valve 940 is connected to an internal gas pipeline 420. Adjusting the cock valve 940 can adjust the flow rate of the main outlet. A switching valve is provided on the gas pipeline. For example, the switching valve is a self-extinguishing valve 950. The gas stove further includes a power adapter for connecting to an external socket, and the power adapter is connected to each blower 210 to obtain power.

[0151] In an embodiment of the present application, as Figure 22 shown, the external burner head combustion unit further includes a temperature control device, and the temperature control device includes:

[0152] A temperature sensor 330 is disposed in the mixing chamber c, and the temperature sensor 330 is used to detect the temperature of the gas in the mixing chamber c;

[0153] A controller, the signal input end of the controller is connected to the temperature sensor 330 for receiving the temperature signal obtained by the temperature sensor 330, and the signal output end of the controller outputs a control signal, and the control signal is used to control the self-extinguishing valve 950 or the blower 210, thereby controlling the on / off of the gas or the air intake volume.

[0154] Specifically, a safety temperature threshold is pre-stored in the controller. The controller receives the temperature signal obtained by the temperature sensor 330 and compares it with the temperature threshold. When the temperature corresponding to the temperature signal is higher than the temperature threshold, the controller determines that the temperature in the mixing chamber is too high, and the controller closes the self-extinguishing valve 950, stops supplying gas, and blocks combustion, thereby improving the safety of using the burner.

[0155] In addition, when the burner is just started in the cold state, if air is supplied in sufficient quantity at the selected ratio for full combustion of gas and air at the beginning, flashback is very likely to occur during combustion. To avoid flashback, when starting in the cold state, the burner can be preheated first, that is, air is supplied in insufficient quantity (i.e., the air supply volume is less than the air volume required for full combustion of gas and air) for combustion at the beginning. When the burner is preheated to a certain temperature, then air is supplied in sufficient quantity (i.e., the air supply volume is equal to the air volume required for full combustion of gas and air).

[0156] To this end, a preheating temperature threshold is also pre-stored in the controller. The controller receives the temperature signal acquired by the temperature sensor 330 and compares it with the preheating temperature threshold. When the temperature corresponding to the temperature signal is lower than the preheating temperature threshold, the controller determines that the gas temperature in the mixing chamber c has not reached the normal operating temperature, and the controller adjusts the rotation speed of the blower 210 so that the blower 210 supplies air at an air supply volume lower than the air supply volume corresponding to the selected ratio. When the temperature corresponding to the temperature signal is not lower than the preheating temperature threshold, the controller determines that the gas temperature in the mixing chamber c has reached the normal operating temperature, and the controller adjusts the rotation speed of the blower 210 so that the blower 210 supplies air in full according to the air supply volume corresponding to the selected ratio, so as to prevent the burner a from experiencing flame lift when it is just started in the cold state.

[0157] It should be noted that the temperature control device needs to be in a working state after the controller recognizes the start of the burner a to perform the above operations (i.e., implement the control of the self-extinguishing valve 950 or the blower 210). As for how to recognize whether the burner a has been started, for example, it can be determined by recognizing whether there is sufficient gas flow in the gas pipeline or the external gas pipeline 410, but this does not belong to the scope to be protected by the embodiments of the present application and will not be elaborated here.

[0158] Each outer fire cover combustion unit can share a controller, and this controller can be arranged in the cooking appliance cavity. In addition, the above safety temperature threshold, preheating temperature threshold, and the actual air supply volume during the preheating stage need to be determined according to the specific working conditions and usage environment of the burner a.

[0159] Furthermore, the bottom end of the temperature sensor 330 is fixed on the outer nozzle bottom plate 520. The top end of the temperature sensor 330 extends upward and passes through the temperature sensor through-hole on the burner bottom plate 510 into the mixing chamber c. And a sealing cover 340 is provided at the top end of the temperature sensor 330. The temperature sensor through-hole is formed with a curled edge 519 extending in the direction of the air chamber d by stamping. The bottom end of the sealing cover 340 is inserted into the temperature sensor through-hole, and a convex edge 341 is formed on the bottom end of the sealing cover 340 and overlaps on the curled edge 519, thereby sealing the gap between the temperature sensor through-hole and the temperature sensor 330 to prevent air leakage in the mixing chamber d.

[0160] It should be understood that although terms such as "first" and "second" may be used here to describe each unit, these units should not be limited by these terms. These terms are only used to distinguish one unit from another. For example, without departing from the scope of the exemplary embodiments, the first unit can be called the second unit, and similarly, the second unit can be called the first unit.

[0161] The outer, middle, inner and other directional terms mentioned or likely to be mentioned in this specification are defined relative to the structures shown in the respective drawings. They are relative concepts and thus may change accordingly depending on their different positions and usage states. Therefore, these or other directional terms should not be construed as restrictive terms.

[0162] As described above, the above are only the preferred embodiments of the present application, and do not impose any formal or substantial restrictions on the present application. It should be noted that for those of ordinary skill in the art of this technology, without departing from the method of the present application, several improvements and supplements can still be made, and these improvements and supplements should also be regarded as within the protection scope of the present invention. Any equivalent changes such as minor modifications, decorations and evolutions made by those skilled in the art who are familiar with this specialty without departing from the spirit and scope of the present application by using the technical content disclosed above are equivalent embodiments of the present application; at the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the substantial technology of the present application still fall within the scope of the technical solution of the present application.

Claims

1. A burner, characterized in that, It includes at least one outer fire cap combustion unit, and when the number of the outer fire cap combustion units exceeds one, the inner and outer sizes of adjacent outer fire cap combustion units are nested with each other; The outer fire cap combustion unit includes an outer fire cap, and the outer fire cap is provided with outer fire holes; The outer fire cap combustion unit further includes an air chamber and a mixing chamber. The air chamber is connected to an air intake power device. One end of the mixing chamber is communicated with both the air chamber and a gas supply component, and the other end is communicated with the outer fire holes. The air chamber defines primary air so that the primary air therein and the gas are premixed in the mixing chamber according to a selected ratio and then supplied to the outer fire holes of the same outer fire cap combustion unit for combustion.

2. The burner according to claim 1, characterized in that, The burner includes a burner bottom plate and an outer nozzle bottom plate which are arranged at intervals up and down. The outer fire cap combustion unit includes an enclosing edge arranged between the burner bottom plate and the outer nozzle bottom plate. The enclosing edge, the upper burner bottom plate and the lower outer nozzle bottom plate enclose and define the air chamber.

3. A burner according to claim 1, characterized in that, The outer fire cap includes an outer cylinder body, and at least one fire ring extending towards the center of the outer cylinder body is formed on the outer cylinder body. The outer fire holes are arranged on the inner peripheral wall of the fire ring. The burner further includes a seal arranged at the center of the innermost outer fire cap combustion unit. The inner wall surface of the outer cylinder body, the seal and the fire ring between the outer cylinder body and the seal enclose the mixing chamber of the innermost outer fire cap combustion unit on the top surface of the burner bottom plate. When the number of the outer fire cap combustion units exceeds one, adjacent outer fire cap combustion units are in clearance fit, and the outer cylinder bodies between adjacent outer fire cap combustion units and the fire rings of the relatively outer outer fire cap combustion units enclose the mixing chamber of the relatively outer outer fire cap combustion unit on the top surface of the burner bottom plate.

4. A burner according to claim 2, characterized in that, The outer fire cap combustion unit further includes a mixing pipe for communicating the mixing chamber and the air chamber. The mixing pipe penetrates through the burner bottom plate; The gas supply component is an outer nozzle. Within the same outer fire cap combustion unit, the outer nozzle passes through the outer nozzle bottom plate and extends into the air chamber. The gas ejected by the outer nozzle and the air in the air chamber enter the mixing chamber through the mixing pipe together.

5. A burner according to claim 4, characterized in that, The outer fire cap combustion unit further includes a first air through hole for communicating the mixing chamber and the air chamber of the same outer fire cap combustion unit, and the first air through hole is opened on the burner bottom plate.

6. A burner according to claim 5, characterized in that, A guide plate is arranged at the outlet of the mixing pipe. The fixed end of the guide plate is fixed on the burner bottom plate, and the free end of the guide plate is located above the corresponding mixing pipe outlet and extends along the inner peripheral wall of the mixing chamber to guide the air and the gas to spiral into the mixing chamber in one direction; The first air through hole is arranged adjacent to a mixing pipe, and the first air through hole is located below the guide plate of the adjacent mixing pipe to share the same guide plate.

7. A burner according to claim 1, characterized in that, The outer burner cap combustion unit further includes a second air through-hole for communicating the mixing chamber and the air chamber of the same outer burner cap combustion unit. The second air through-holes are spaced apart along the circumferential direction of the mixing chamber and are provided on the burner base plate. At least part of the second air through-holes are provided with an enclosing cover on the same side along the circumferential direction of the mixing chamber, and each enclosing cover defines that the air in the second air through-hole spirally enters the mixing chamber in the same direction.

8. A burner according to claim 3, characterized in that, The outer burner cap includes at least one fire outlet ring, and the outer fire outlet holes on the same fire outlet ring form a fire outlet surface. When the outer burner cap includes at least two fire outlet rings, each fire outlet ring is gradually downward from the outer cylinder to the center of the outer cylinder, and then the outer burner cap forms a plurality of stepped fire outlet surfaces that gradually shrink and descend from the inner circumferential surface of the outer cylinder to the center of the outer cylinder. An annular end face extending into the outer cylinder is provided on the top surface of the outer cylinder. The fire outlet ring is fixed on the upper surface or the lower surface of the annular end face, and adjacent fire outlet rings are connected by a connecting ring.

9. A burner according to claim 3, characterized in that, Each fire outlet ring includes at least one fire outlet piece layer, and each fire outlet piece layer includes at least one fire outlet piece. The inner edge of the fire outlet piece is recessed outward at intervals to form a plurality of fire outlet grooves with the notch facing the center of the fire outlet piece. A cover, a gasket layer or the annular end face is provided above each fire outlet piece layer, and a gasket layer or the annular end face is provided below each fire outlet piece layer. Each gasket layer includes at least one gasket. The fire outlet grooves in the same fire outlet piece layer are aligned up and down, and together with the cover, gasket layer or the annular end face adjacent above, and the gasket layer or the annular end face adjacent below, enclose to form a layer of outer fire outlet holes. The outer fire outlet holes in the same layer are spaced apart along the circumferential direction and form a circle. Each outer fire outlet hole is communicated with an independent vertical air inlet channel, and the vertical air inlet channel is communicated with the mixing chamber of the same outer burner cap combustion unit. The vertical air inlet channel corresponding to any outer fire outlet hole is arranged below the corresponding outer fire outlet hole. The top end of the vertical air inlet channel is communicated with the corresponding outer fire outlet hole, and the bottom end of the vertical air inlet channel extends to be communicated with the mixing chamber. When the fire outlet ring is fixed on the lower surface of the annular end face, the fire outlet ring is located in the mixing chamber. At least part of the outer fire outlet holes are formed with a horizontal air inlet channel. The horizontal air inlet channel is horizontally arranged on one side of the corresponding outer fire outlet hole, and the horizontal air inlet channel communicates the mixing chamber and the corresponding outer fire outlet hole.

10. A burner according to claim 3, characterized in that, The gas supply component is communicated with a gas source through a gas pipeline, and a switching valve is provided on the gas pipeline. The outer burner cap combustion unit further includes a temperature control device, and the temperature control device includes: A temperature sensor is arranged in the mixing chamber, and the temperature sensor is used to detect the temperature of the gas in the mixing chamber. A controller, the signal input end of the controller is connected with the temperature sensor, is used to receive the temperature signal obtained by the temperature sensor, the signal output end of the controller outputs a control signal, and the control signal is used to control the switching valve or the air inlet power device, so as to control the on-off of the gas or the air intake. The controller pre-stores a safety temperature threshold value. The controller receives the temperature signal acquired by the temperature sensor and compares it with the temperature threshold value. When the temperature corresponding to the temperature signal is higher than the temperature threshold value, the controller determines that the temperature in the mixing chamber is too high, and the controller closes the switching valve to block combustion; The controller also pre-stores a preheating temperature threshold value. The controller receives the temperature signal acquired by the temperature sensor and compares it with the preheating temperature threshold value. When the temperature corresponding to the temperature signal is lower than the preheating temperature threshold value, the controller determines that the gas temperature in the mixing chamber has not reached the normal operating temperature, and the controller adjusts the air intake power device to make the air intake power device supply air according to the air volume corresponding to a proportion lower than the selected proportion; when the temperature corresponding to the temperature signal is not lower than the preheating temperature threshold value, the controller determines that the gas temperature in the mixing chamber has reached the normal operating temperature, and the controller controls the air intake power device to make the air intake power device supply air in full according to the air volume corresponding to the selected proportion.

11. A combustion appliance, characterized in that, The combustion appliance includes a burner according to any one of claims 1 to 10; When the combustion appliance is a gas stove, the gas stove includes a bottom shell. A burner installation opening is formed on the bottom surface of the bottom shell, and a plurality of support feet are spaced apart on the edge of the burner installation opening. The burner is fixedly mounted on the support feet.

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