Combustor and stove

Abstract

The utility model discloses a burner and a stove, and belongs to the technical field of stoves. The combustor comprises a furnace end, an inner ring fire hole, an outer ring fire hole, a first flow guide groove and a second flow guide groove are formed in the furnace end, the first flow guide groove is located between the inner ring fire hole and the outer ring fire hole, the second flow guide groove is located on the inner side of the inner ring fire hole, and the first flow guide groove and the second flow guide groove are both located below the inner ring fire hole and the outer ring fire hole. The first flow guide grooves are used for guiding secondary air to the flame root portions of the inner ring fire holes and the flame root portions of the outer ring fire holes, and the second flow guide grooves are used for guiding the secondary air to the flame root portions of the inner ring fire holes. According to the combustor, secondary air can be directly supplemented to the roots of flames of the inner ring fire holes and the outer ring fire holes, the utilization rate of the secondary air is increased, the supplementing amount of the secondary air is reduced, resources are saved, and cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of stoves, in particular to a burner and a stove. Background Art

[0002] In a double-ring burner, primary air and secondary air need to be supplemented; the air mixed with the fuel gas and ejected through the inner ring fire holes and the outer ring fire holes is the primary air, and the secondary air is the air in addition to the primary air and can supply the flame for continuous combustion.

[0003] However, when secondary air is supplemented to the inner ring fire holes and the outer ring fire holes, the supplemented secondary air is usually located on the outer peripheral side or above the inner ring fire holes and the outer ring fire holes, and the supplemented secondary air cannot be well utilized, resulting in a lot of secondary air being wasted, reducing the utilization rate of the secondary air, and increasing the amount of secondary air supplemented, resulting in waste of resources and high costs.

[0004] In view of the above problems, burners and stoves are urgently needed to solve the above problems. Utility Model Content

[0005] The first purpose of the utility model is to provide a burner that can directly add secondary air to the flame roots of the inner ring fire holes and the outer ring fire holes, thereby increasing the utilization rate of the secondary air, reducing the amount of secondary air added, saving resources and reducing costs.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A burner, comprising:

[0008] A burner head, in which an inner ring fire hole, an outer ring fire hole, a first guide groove and a second guide groove are respectively provided, the first guide groove is located between the inner ring fire hole and the outer ring fire hole, the second guide groove is located on the inner side of the inner ring fire hole, and the first guide groove and the second guide groove are both located below the inner ring fire hole and the outer ring fire hole, the first guide groove is used to guide secondary air to the flame roots of the inner ring fire hole and the outer ring fire hole respectively, and the second guide groove is used to guide secondary air to the flame root of the inner ring fire hole.

[0009] As an optional solution, the burner further comprises:

[0010] Blower;

[0011] The base is connected to the blower, the burner is arranged on the base, the base is provided with a blast channel, the burner is also provided with a first inlet and an intermediate cavity connected with the first inlet, the first inlet is connected with the blast channel, the blower is used to provide air for the blast channel, at least to allow air to enter the intermediate cavity as secondary air through the first inlet, and the intermediate cavity is used to pressurize and decelerate the secondary air therein.

[0012] As an optional solution, a flow limiting groove connected to the intermediate cavity is also provided in the furnace head. The flow limiting groove is located above the intermediate cavity, and the intermediate cavity is respectively connected to the first guide groove and the second guide groove through the flow limiting groove, so that the secondary air in the intermediate cavity flows to the first guide groove and the second guide groove through the flow limiting groove.

[0013] As an optional solution, the number of the flow limiting grooves is at least two, and the intermediate cavity is connected to the first guide groove and the second guide groove through different flow limiting grooves.

[0014] As an optional solution, a first injection port connected to the intermediate cavity is further provided in the furnace head, and when the blower blows secondary air into the intermediate cavity, the secondary air can be driven into the intermediate cavity through the first injection port.

[0015] As an optional solution, a venturi tube and a nozzle are further provided in the burner head. The nozzle is provided at the inlet of the venturi tube. A second injection port is formed between the inlet of the venturi tube and the nozzle. When the nozzle is used to spray gas into the venturi tube, at least the air in the blast channel can enter the venturi tube as primary air through the second injection port, so that the primary air can be sprayed to the outer ring fire hole and the inner ring fire hole through the venturi tube.

[0016] As an optional solution, a second inlet connected to the blast channel is further provided in the furnace head, the second inlet is connected to the second injection port, and the second inlet is arranged close to one side of the nozzle.

[0017] As an optional solution, the burner further comprises:

[0018] A first annular baffle is disposed in a first cavity between the inner ring fire hole and the outer ring fire hole, and the first guide groove is formed between the outer edge of the first annular baffle and the inner wall surface of the first cavity;

[0019] The second annular baffle is arranged in the second cavity inside the inner ring fire hole, and the second guide groove is formed between the outer edge of the second annular baffle and the inner wall surface of the second cavity.

[0020] As an optional solution, the burner further comprises:

[0021] A first fire cover and a second fire cover are respectively covered on the inner ring fire hole and the outer ring fire hole;

[0022] The ignition needle and the temperature detector are respectively connected between the outer ring fire hole and the inner ring fire hole.

[0023] The second object of the utility model is to provide a stove, which includes the above-mentioned burner and can increase the utilization rate of secondary air, reduce the amount of secondary air supplement, and achieve the purpose of energy saving and emission reduction.

[0024] To achieve this purpose, the utility model adopts the following technical solutions:

[0025] A cooking appliance comprising the burner as described above.

[0026] The beneficial effects of the utility model are:

[0027] By respectively arranging an inner ring fire hole, an outer ring fire hole, a first guide groove and a second guide groove in the furnace head, the first guide groove is located between the inner ring fire hole and the outer ring fire hole, the second guide groove is located on the inner side of the inner ring fire hole, and the first guide groove and the second guide groove are both located below the inner ring fire hole and the outer ring fire hole, so that the flow direction of the secondary air can be changed through the guiding effect of the first guide groove and the second guide groove, so that the secondary air in the first guide groove flows to the flame roots of the inner ring fire hole and the outer ring fire hole respectively, and the secondary air in the second guide groove flows to the flame root of the inner ring fire hole, thereby increasing the utilization rate of the secondary air and reducing the supplementary amount of the secondary air, so that the excess amount of the secondary air can be controlled, the excess secondary air can reduce the heat taken away by the excess secondary air, resources can be saved, and costs can be reduced, thereby reducing energy efficiency losses and achieving the purpose of energy saving and emission reduction.

[0028] The stove in the utility model, because it includes the burner, can fully utilize the supplemented secondary air and reduce the supplement amount of the secondary air, so that the energy-saving and emission-reduction effect of the whole stove is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the structure of the burner provided by the utility model. Figure 1 ;

[0030] Figure 2 This is a schematic diagram of the structure of the burner provided by the utility model (part of the structure is cut off and the first injection port is provided) Figure 2 ;

[0031] Figure 3 This is a cross-sectional view of the burner provided by the utility model Figure 1 ;

[0032] Figure 4 This is a schematic diagram of the structure of the burner provided by the utility model (part of the structure is cut off and the first injection port is not provided) Figure 3 ;

[0033] Figure 5 This is a schematic diagram of the structure of the burner provided by the utility model (partial structure is cut off) Figure 3 ;

[0034] Figure 6 This is a cross-sectional view of the burner provided by the utility model Figure 2 .

[0035] Description of reference numerals:

[0036] 1-blower; 2-base; 21-blowing channel;

[0037] 3-burner head; 31-first inlet; 32-middle cavity; 33-flow limiting groove; 34-first injection port; 35-Venturi tube; 351-inner tube; 352-outer tube; 353-entry port; 36-nozzle; 37-second injection port; 38-second inlet; 391-first guide groove; 392-second guide groove; 393-outer ring fire hole; 394-inner ring fire hole;

[0038] 4-second fire cover; 5-ignition needle; 6-temperature detector; 7-first fire cover; 8-first annular baffle; 9-second annular baffle. DETAILED DESCRIPTION

[0039] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0040] Any feature disclosed in this specification, unless otherwise stated, may be replaced by other equivalent or alternative features having similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features. Throughout the specification, the same reference numerals indicate the same elements.

[0041] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clearly, the technical solutions of the present invention are further explained below with reference to the accompanying drawings and through specific implementation methods.

[0042] In this embodiment, a burner and a stove including the burner are proposed. The burner can make full use of the secondary air supplemented and has a good energy-saving and emission-reduction effect. The burner in this embodiment is a double-ring burner. In other embodiments, the burner can also be other multi-ring burners, which are not specifically limited here.

[0043] Specifically, Figures 1 to 3 As shown, the burner includes a burner head 3, in which an inner fire ring hole 394, an outer fire ring hole 393, a first guide groove 391 and a second guide groove 392 are respectively provided. The first guide groove 391 is located between the inner fire ring hole 394 and the outer fire ring hole 393, and the second guide groove 392 is located on the inner side of the inner fire ring hole 394. The first guide groove 391 and the second guide groove 392 are both located below the inner fire ring hole 394 and the outer fire ring hole 393. The first guide groove 391 is used to guide secondary air to the flame roots of the inner fire ring hole 394 and the outer fire ring hole 393 respectively, and the second guide groove 392 is used to guide secondary air to the flame root of the inner fire ring hole 394.

[0044] Compared with the prior art, the burner in this embodiment changes the supplementary position of the secondary air in the inner ring fire hole 394 and the outer ring fire hole 393; by respectively arranging the inner ring fire hole 394, the outer ring fire hole 393, the first guide groove 391 and the second guide groove 392 in the burner head 3, the first guide groove 391 is located between the inner ring fire hole 394 and the outer ring fire hole 393, the second guide groove 392 is located on the inner side of the inner ring fire hole 394, and the first guide groove 391 and the second guide groove 392 are both located between the inner ring fire hole 394 and the outer ring fire hole 393. Below the fire ring hole 393, the flow direction of the secondary air can be changed through the guiding effect of the first guide groove 391 and the second guide groove 392, so that the secondary air in the first guide groove 391 flows to the flame roots of the inner fire ring hole 394 and the outer fire ring hole 393 respectively, and the secondary air in the second guide groove 392 flows to the flame root of the inner fire ring hole 394, thereby increasing the utilization rate of the secondary air, reducing the amount of secondary air supplement, saving resources, and reducing costs, thereby reducing energy efficiency losses and achieving the purpose of energy conservation and emission reduction.

[0045] The specific flow path of the secondary air in the furnace head 3 is described below:

[0046] Specifically, Figure 2 As shown, the burner also includes a first annular baffle 8 and a second annular baffle 9; wherein the first annular baffle 8 is arranged in the first cavity between the inner ring fire hole 394 and the outer ring fire hole 393, and two first guide grooves 391 are formed between the two opposite outer edges of the first annular baffle 8 and the two opposite inner wall surfaces of the first cavity respectively; the second annular baffle 9 is arranged in the second cavity inside the inner ring fire hole 394, and a second guide groove 392 is formed between the outer edge of the second annular baffle 9 and the inner wall surface of the second cavity.

[0047] One of the two first guide grooves 391 formed guides the secondary air to the flame root of the outer ring fire hole 393, and the other first guide groove 391 guides the secondary air to the flame root of the inner ring fire hole 394, so that the secondary air in the first guide groove 391 is guided to the flame root of the outer ring fire hole 393 and the flame root of the inner ring fire hole 394 respectively.

[0048] Furthermore, if Figure 1 and Figure 3 As shown, the burner also includes a blower 1 and a base 2; wherein the base 2 is connected to the blower 1, the burner head 3 is installed on the base 2, a blast channel 21 is provided in the base 2, a first inlet 31 and an intermediate cavity 32 connected to the first inlet 31 are also provided in the burner head 3, the first inlet 31 is connected to the blast channel 21, the blower 1 is used to provide air (including primary air and secondary air) to the blast channel 21, at least the air in the blast channel 21 can enter the intermediate cavity 32 as secondary air through the first inlet 31, and the intermediate cavity 32 is used to pressurize and decelerate the secondary air therein.

[0049] By setting up an intermediate cavity 32 for pressurization and deceleration, the secondary air can reduce its flow rate in the intermediate cavity 32, avoiding the problem of the flame being blown out when the secondary air has too high a flow rate and is directly supplemented to the inner ring fire holes 394 and the outer ring fire holes 393, thereby reducing the phenomenon of the flame being blown away or blown out by the supplemented secondary air, thereby achieving the purpose of uniformly supplementing the secondary air.

[0050] Furthermore, if Figure 2 and Figure 3 As shown, a flow limiting groove 33 connected to the intermediate cavity 32 is also provided in the furnace head 3. The flow limiting groove 33 is located above the intermediate cavity 32, and the intermediate cavity 32 is connected to the first guide groove 391 and the second guide groove 392 respectively through the flow limiting groove 33, so that the secondary air in the intermediate cavity 32 flows to the first guide groove 391 and the second guide groove 392 respectively through the flow limiting groove 33.

[0051] By providing the flow limiting groove 33, the flow rate of the secondary air in the middle cavity 32 can be further reduced, so as to better reduce the phenomenon of the supplemented secondary air blowing away or extinguishing the flame, so that the flow rate of the secondary air flowing into the first guide groove 391 is more uniform.

[0052] Specifically, the number of the limiting grooves 33 is at least two, and the intermediate cavity 32 is connected to the first guide groove 391 and the second guide groove 392 through different limiting grooves 33, so that the secondary air in the intermediate cavity 32 can enter the first guide groove 391 and the second guide groove 391 after passing through the different limiting grooves 33, thereby ensuring that the secondary air is decelerated more evenly, thereby ensuring that the uniformity of the secondary air in the first guide groove 391 and the second guide groove 392 is better. In this embodiment, the limiting groove 33 is specifically an arc groove.

[0053] Furthermore, if Figure 2 As shown, a first injection port 34 connected to the intermediate cavity 32 is further provided in the burner head 3. When the blower 1 blows secondary air into the intermediate cavity 32 through the first inlet 31, due to the effect of the secondary air blown by the blower 1, the secondary air can be driven into the intermediate cavity 32 through the first injection port 34 while being blown. That is, at this time, the secondary air in the intermediate cavity 32 is blown into it by the blower 1 through the first inlet 31 and is naturally introduced into it through the first injection port 34 while being blown, so as to increase the amount of secondary air entering the intermediate cavity 32, thereby improving the secondary air coefficient.

[0054] It is worth noting that, in other embodiments, Figure 4 As shown, the first injection port 34 may not be provided in the furnace head 3, so that the secondary air in the intermediate cavity 32 is completely blown in by the blower 1 through the first inlet 31. Here, the arrangement of the first injection port 34 is not specifically limited.

[0055] The specific flow path of the secondary air in this embodiment is as follows:

[0056] First, the blower 1 blows air into the blowing channel 21, and then makes the air in the blowing channel 21 flow into the middle cavity 32 through the first inlet 31 as secondary air; at the same time, the secondary air can be driven to enter the middle cavity 32 through the first injection port 34 while blowing; thereafter, the secondary air is pressurized and decelerated in the middle cavity 32, so that the flow rate of the secondary air in the middle cavity 32 is more uniform.

[0057] Then, a part of the secondary air in the middle cavity 32 passes through a flow limiting groove 33 to further reduce the flow velocity, and then the secondary air in the flow limiting groove 33 flows into the first guide groove 391, so that the secondary air is supplemented to the flame root of the outer ring fire hole 393 and the flame root of the inner ring fire hole 394 through the guiding effect of the first guide groove 391; at the same time, the remaining part of the secondary air in the middle cavity 32 passes through another flow limiting groove 33 to further reduce the flow velocity, and the secondary air in the flow limiting groove 33 flows into the second guide groove 392, so that the secondary air is supplemented to the flame root of the inner ring fire hole 394 through the guiding effect of the second guide groove 392, so as to realize the supplement of secondary air.

[0058] The specific flow path of the primary air in the furnace head 3 is described below:

[0059] Specifically, Figure 2 , Figure 5 and Figure 6 As shown, a venturi tube 35 and a nozzle 36 are also provided in the burner head 3. The venturi tube 35 is located in the above-mentioned intermediate cavity 32 and is not connected to the intermediate cavity 32. The nozzle 36 is provided at the inlet 353 of the venturi tube 35. A second injection port 37 is formed between the inlet 353 of the venturi tube 35 and the nozzle 36. When the nozzle 36 is used to inject gas into the venturi tube 35, at least the air in the blast channel 21 can be naturally injected into the venturi tube 35 through the second injection port 37 as primary air, so that the primary air can be sprayed to the outer ring fire hole 393 and the inner ring fire hole 394 through the venturi tube 35.

[0060] By setting the nozzle 36 and the second injection port 37 used in coordination with each other, the nozzle 36 can eject high-speed gas into the venturi tube 35 while driving primary air into the second injection port 37 to replenish primary air. Among them, since the outer ring fire hole 393 and the inner ring fire hole 394 are provided, correspondingly, two nozzles 36 and two second injection ports 37 are respectively provided, one nozzle 36 and one second injection port 37 are used to spray gas and replenish primary air into the inner tube 351 of the venturi tube 35, so as to inject gas and primary air into the inner ring fire hole 394 through the inner tube 351; the other nozzle 36 and the other second injection port 37 are used to spray gas and replenish primary air into the outer tube 352 of the venturi tube 35, so as to inject gas and primary air into the outer ring fire hole 393 through the outer tube 352. Among them, the venturi tube 35 is a common structure in the existing burner, and the working principle of the venturi tube 35 is not described in detail here.

[0061] It is worth explaining that the primary air and secondary air in the present embodiment are actually the air blown in by the blower 1. The primary air specifically refers to the air that enters the venturi tube 35, mixes with the fuel gas and is directly ejected through the inner ring fire hole 394 and the outer ring fire hole 393. The primary air will not enter the above-mentioned intermediate cavity 32; the secondary air is the air other than the primary air and can supply the flame for continuous combustion. The secondary air will not flow out from the inner ring fire hole 394 and the outer ring fire hole 393, but will only be supplemented to the flame roots of the inner ring fire hole 394 and the outer ring fire hole 393 through the first guide groove 391 and the second guide groove 392.

[0062] Furthermore, if Figure 5 and Figure 6 As shown, a second inlet 38 connected to the blast channel 21 is further provided in the burner 3, and the second inlet 38 is connected to the second injection port 37, so that the air in the blast channel 21 flows into the venturi tube 35 as primary air through the second inlet 38; and the second inlet 38 is arranged close to one side of the nozzle 36, so that the primary air can be blown along the edge of the nozzle 36, so that the nozzle 36 can spray high-speed combustion gas into the venturi tube 35 while driving the primary air to be blown into the second inlet 38, so that more primary air can be blown into the venturi tube 35 through the second inlet 38, thereby increasing the amount of primary air entering the venturi tube 35 to improve the coefficient of primary air.

[0063] By arranging the second inlet 38 close to the nozzle 36 and being located on one side of the nozzle 36, more primary air can be driven to be blown into the second inlet 38 through the injection action of the nozzle 36, so that a larger amount of primary air can enter the venturi tube 35; at the same time, a second injection port 37 is provided so that the primary air can be naturally injected into the second injection port 37 through the injection action of the nozzle 36; that is, by supplementing the primary air through the second inlet 38 and the second injection port 37, the amount of primary air entering the venturi tube 35 can be further increased, thereby better improving the coefficient of the primary air.

[0064] It is worth noting that if Figure 5 and Figure 6 As shown, since two nozzles 36 and two second injection ports 37 are provided, two second inlets 38 are provided in the furnace head 3 accordingly, and the first inlet 31 is located between the two second inlets 38, one second inlet 38 is located on one side of one nozzle 36, and the other second inlet 38 is located on one side of the other nozzle 36, so that at each nozzle 36, primary air is replenished through a second inlet 38 and a second injection port 37.

[0065] The specific flow path of the secondary air in this embodiment is as follows:

[0066] First, the blower 1 blows air into the blast channel 21, and the air in the blast channel 21 is blown into the Venturi tube 35 as primary air through the two second inlets 38, that is, the air blown into the two second inlets 38 is primary air; at the same time, the air in the blast channel 21 is blown into the first inlet 31 and then enters the intermediate cavity 32, that is, the air blown into the first inlet 31 is secondary air, so as to realize the diversion of the air in the blast channel 21.

[0067] Then, the nozzle 36 sprays high-speed combustion gas into the Venturi tube 35. While spraying the high-speed combustion gas, the high speed of the combustion gas can drive primary air into the second injection port 37, so that the primary air enters the Venturi tube 35 through the second injection port 37; at the same time, when primary air is blown into the second inlet 38, the high speed of the combustion gas can drive more primary air into the second inlet 38, so that more primary air enters the Venturi tube 35 through the second inlet 38.

[0068] Finally, the primary air entering the inner tube 351 of the Venturi tube 35 is sprayed to the inner ring fire hole 394, and the primary air entering the outer tube 352 of the Venturi tube 35 is sprayed to the outer ring fire hole 393, so as to realize the replenishment of the primary air.

[0069] Specifically, Figure 1 As shown, the burner further includes a first fire cover 7, a second fire cover 4, an ignition needle 5 and a temperature detector 6; wherein the first fire cover 7 and the second fire cover 4 are respectively covered on the inner ring fire hole 394 and the outer ring fire hole 393; the ignition needle 5 and the temperature detector 6 are respectively connected between the outer ring fire hole 393 and the inner ring fire hole 394, and the first annular baffle 8 is respectively provided with a avoidance opening for avoiding the ignition needle 5 and the temperature detector 6; the ignition needle 5 is used for ignition operation, and the temperature detector 6 is used for detecting the temperature of the flame. In this embodiment, the temperature detector 6 can specifically be a thermocouple temperature sensor.

[0070] The burner in this embodiment is provided with a first guide groove 391 and a second guide groove 392 for changing the flow direction of the secondary air, so that the secondary air in the first guide groove 391 and the second guide groove 392 can be supplemented to the flame roots of the outer ring fire hole 393 and the inner ring fire hole 394, thereby improving the utilization rate of the secondary air, so as to be able to control the excess amount of the secondary air, reduce the heat taken away by the excess secondary air, and improve the energy efficiency of the burner; at the same time, an intermediate cavity 32 capable of pressurizing and decelerating the secondary air is provided in the burner head 3, so that the flow rate of the secondary air in the intermediate cavity 32 is relatively uniform, so that the secondary air can be evenly distributed. The secondary air flows evenly to the flame roots of the outer ring fire holes 393 and the inner ring fire holes 394, so as to improve the combustion capacity of the entire burner; and, a flow limiting groove 33 is provided above the intermediate cavity 32, so as to further reduce the flow rate of the secondary air flowing to the intermediate cavity 32, so that the flow rate of the secondary air is more uniform; and, a second inlet 38 for blowing primary air is provided close to one side of the nozzle 36, so as to enable more primary air to enter the Venturi tube 35 through the second inlet 38, thereby increasing the supplementary amount of primary air, thereby improving the primary air coefficient, and further improving the combustion capacity of the entire burner.

[0071] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. A burner, characterized in that: include: A furnace head (3), wherein an inner ring fire hole (394), an outer ring fire hole (393), a first guide groove (391) and a second guide groove (392) are respectively provided therein, wherein the first guide groove (391) is located between the inner ring fire hole (394) and the outer ring fire hole (393), the second guide groove (392) is located on the inner side of the inner ring fire hole (394), and the first guide groove (391) and the second guide groove (392) are both located below the inner ring fire hole (394) and the outer ring fire hole (393), the first guide groove (391) is used to guide secondary air to the flame roots of the inner ring fire hole (394) and the outer ring fire hole (393), respectively, and the second guide groove (392) is used to guide secondary air to the flame root of the inner ring fire hole (394).

2. The burner according to claim 1, characterized in that The burner also includes: Blower (1); A base (2) is connected to the blower (1), the burner head (3) is arranged on the base (2), a blast channel (21) is arranged in the base (2), a first inlet (31) and an intermediate cavity (32) connected to the first inlet (31) are also arranged in the burner head (3), the first inlet (31) is connected to the blast channel (21), the blower (1) is used to provide air to the blast channel (21), at least to allow air to enter the intermediate cavity (32) as secondary air through the first inlet (31), and the intermediate cavity (32) is used to increase the pressure and reduce the speed of the secondary air therein.

3. The burner according to claim 2, characterized in that The furnace head (3) is further provided with a flow limiting groove (33) in communication with the intermediate cavity (32); the flow limiting groove (33) is located above the intermediate cavity (32); and the intermediate cavity (32) is respectively in communication with the first guide groove (391) and the second guide groove (392) through the flow limiting groove (33), so that the secondary air in the intermediate cavity (32) flows through the flow limiting groove (33) to the first guide groove (391) and the second guide groove (392).

4. The burner according to claim 3, characterized in that The number of the flow limiting grooves (33) is at least two, and the intermediate cavity (32) is connected to the first flow guiding groove (391) and the second flow guiding groove (392) through different flow limiting grooves (33).

5. The burner according to claim 2, characterized in that The furnace head (3) is also provided with a first injection port (34) connected to the intermediate cavity (32); when the blower (1) blows secondary air into the intermediate cavity (32), the secondary air can be driven to enter the intermediate cavity (32) through the first injection port (34).

6. The burner according to any one of claims 2 to 5, characterized in that: The burner head (3) is further provided with a venturi tube (35) and a nozzle (36). The nozzle (36) is provided at an inlet (353) of the venturi tube (35). A second injection port (37) is formed between the inlet (353) of the venturi tube (35) and the nozzle (36). When the nozzle (36) is used to inject fuel gas into the venturi tube (35), at least the air in the blast channel (21) can enter the venturi tube (35) as primary air through the second injection port (37), so that the primary air is sprayed to the outer ring fire hole (393) and the inner ring fire hole (394) through the venturi tube (35).

7. The burner according to claim 6, characterized in that A second inlet (38) communicating with the blast channel (21) is also provided in the furnace head (3), the second inlet (38) communicating with the second injection port (37), and the second inlet (38) is arranged close to one side of the nozzle (36).

8. The burner according to any one of claims 1 to 5, characterized in that: The burner also includes: A first annular baffle (8) is disposed in a first cavity between the inner ring fire hole (394) and the outer ring fire hole (393), wherein the first guide groove (391) is formed between the outer edge of the first annular baffle (8) and the inner wall surface of the first cavity; The second annular baffle (9) is arranged in the second cavity inside the inner ring fire hole (394), and the second guide groove (392) is formed between the outer edge of the second annular baffle (9) and the inner wall surface of the second cavity.

9. The burner according to any one of claims 1 to 5, characterized in that: The burner also includes: A first fire cover (7) and a second fire cover (4) are respectively arranged on the inner ring fire hole (394) and the outer ring fire hole (393); The ignition needle (5) and the temperature detector (6) are respectively connected between the outer ring fire hole (393) and the inner ring fire hole (394).

10. A cooking appliance, characterized in that: Comprising the burner according to any one of claims 1-9.

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