Burner burner and gas stove

Abstract

The furnace end burner comprises a main body assembly and a center fire cover, an air inlet channel is arranged in the middle of the lower side of the main body assembly, the main body assembly is provided with an air distribution cavity and an outer ring air cavity, the air inlet channel is communicated with the lower side of the air distribution cavity, and the outer ring air cavity is annular and located on the periphery of the air distribution cavity. Connecting channels are arranged between the gas distribution cavity and the outer ring gas cavity, the gas distribution cavity and the outer ring gas cavity are communicated through the connecting channels, the multiple connecting channels are evenly distributed around the gas distribution cavity at intervals, a flow dividing structure is arranged at the butt joint communication position of the connecting channels and the outer ring gas cavity, and outer ring fire holes for outputting fuel gas are formed in the portion, corresponding to the outer ring gas cavity, of the main body assembly. The center fire cover is arranged on the upper side of the main body assembly, a center gas cavity is defined between the center fire cover and the main body assembly, the center gas cavity is communicated with the upper side of the gas distribution cavity, and the center fire cover is provided with a center fire hole for gas output corresponding to the center gas cavity. According to the utility model, the gas output uniformity of the outer ring can be improved, the fire power uniformity of the outer ring is ensured, and a better heating effect is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas equipment technical field, especially a furnace head combustor and gas stove. BACKGROUND

[0002] The existing furnace head combustor generally adopts inner and outer ring flames to carry out combustion heating, for the output combustion of the outer ring gas, the furnace head combustor usually delivers the gas to the outer ring gas cavity through the setting of a separate outer ring gas channel, and then the gas is output and combusted through the outer ring fire cover. In order to realize the shunt of the gas in the outer ring gas cavity, the existing design usually sets a shunt piece at the butt joint of the outer ring gas channel and the outer ring gas cavity, however, the gas is gradually combusted during the delivery in the outer ring gas cavity, and with the increase of the delivery distance, the gas amount reaching the area of the outer ring gas cavity far away from the gas outlet of the outer ring gas channel is less, and the gas pressure is also lower, which makes the flame of the area far away from the gas outlet of the outer ring gas channel in the outer ring flame weaker, causing the uneven distribution of the outer ring firepower, and further affecting the heating effect of the outer ring flame. SUMMARY

[0003] The utility model discloses at least solve one of the prior art technical problems. For this purpose, the utility model provides a furnace head combustor, which can deliver the gas to multiple positions of the outer ring gas cavity more uniformly through the setting of the gas distribution cavity and the plurality of connecting channels, and then shunts through the shunt structure, which is beneficial to improving the uniformity of the outer ring gas output, ensuring the uniformity of the outer ring firepower, and realizing better heating effect.

[0004] The utility model further provides a gas stove with the furnace head combustor.

[0005] The furnace head combustor according to the first aspect embodiment of the utility model comprises a main body assembly and a center fire cover, the lower side middle part of the main body assembly is equipped with a gas inlet channel, the main body assembly is equipped with a gas distribution cavity and an outer ring gas cavity, the gas inlet channel is communicated with the lower side of the gas distribution cavity, the outer ring gas cavity is annular and located at the outer periphery of the gas distribution cavity, a connecting channel is arranged between the gas distribution cavity and the outer ring gas cavity and communicated through the connecting channel, the connecting channel is provided with a plurality of connecting channels and uniformly spaced around the gas distribution cavity, the connecting channel and the butt joint communication of the outer ring gas cavity are provided with a shunt structure, the main body assembly is provided with an outer ring fire hole for gas output corresponding to the outer ring gas cavity, the center fire cover is arranged on the upper side of the main body assembly and defines a center gas cavity with the main body assembly, the center gas cavity is communicated with the upper side of the gas distribution cavity, and the center fire cover is provided with a center fire hole for gas output corresponding to the center gas cavity.

[0006] The furnace head burner has at least the following beneficial effects: when in use, the gas is input from the air inlet channel to the gas distribution cavity, part of the gas in the gas distribution cavity enters the central gas cavity and is output from the central fire hole for combustion, the remaining gas in the gas distribution cavity enters the plurality of connecting channels and is transported to different positions of the outer ring gas cavity through the connecting channels, the plurality of connecting channels are uniformly and spacedly distributed around the gas distribution cavity, so that the gas can be uniformly transported to multiple positions of the outer ring gas cavity, and the gas amount and the gas pressure at each position of the outer ring gas cavity can be relatively uniform through the shunt structure at the butt joint communication position of the connecting channel and the outer ring gas cavity, which is beneficial to improving the uniformity of the outer ring gas output and ensuring the uniformity of the outer ring firepower, so that a better heating effect is achieved.

[0007] According to some embodiments of the utility model, the main body assembly includes a main body seat and a seat cover, the air inlet channel is arranged in the lower middle part of the main body seat, the seat cover is arranged on the upper side of the main body seat and defines the gas distribution cavity and the outer ring gas cavity with the main body seat, and the central fire cover is arranged on the upper middle part of the seat cover and defines the central gas cavity with the seat cover.

[0008] According to some embodiments of the utility model, the central fire cover and the seat cover are connected and fixed through a threaded structure.

[0009] According to some embodiments of the utility model, the main body seat and the seat cover are connected and fixed through a threaded structure.

[0010] According to some embodiments of the utility model, the main body seat is provided with a connecting column, the connecting column is located at the butt joint communication position of the connecting channel and the outer ring gas cavity and is used for connecting the seat cover, the shunt structure includes a shunt part arranged on the connecting column, the shunt part is arranged towards the gas outlet end of the connecting channel and is used for shunting the gas output by the connecting channel to both sides of the connecting column.

[0011] According to some embodiments of the utility model, the lower side of the central gas cavity is a necked structure, so that the diameter size of the gas inlet of the central gas cavity is smaller than the diameter size of the gas inlet of the gas distribution cavity.

[0012] According to some embodiments of the utility model, the outer ring fire hole is provided with a plurality of and is uniformly and spacedly distributed around the central fire cover, each outer ring fire hole is provided with a flame stabilizing hole on the side, and the flame stabilizing hole is in communication with the outer ring gas cavity.

[0013] According to some embodiments of the utility model, the central fire hole is provided with a plurality of and is uniformly and spacedly distributed along the outer periphery of the central fire cover, the central fire cover is provided with a flame stabilizing groove below the central fire hole, and the flame stabilizing groove is in communication with the central gas cavity.

[0014] According to some embodiments of the present application, the main body assembly is provided with air passages, the air passages are provided with a plurality of air passages and are uniformly and spacedly distributed along the outer periphery of the main body assembly, and the air passages are used for air supplement from the outer periphery of the main body assembly to the outer periphery of the central fire cover.

[0015] According to the second aspect of the present application, the gas stove comprises the burner head burner according to the first aspect of the present application.

[0016] According to the second aspect of the present application, the gas stove comprises the burner head burner according to the first aspect of the present application.

[0017] The additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0019] Figure 1 The structure schematic view of the burner head burner of the present application embodiment is shown in the figure;

[0020] Figure 2 The structure schematic view of the burner head burner of the present application embodiment is shown in the figure; Figure 1 The exploded structure schematic view of the burner head burner is shown in the figure;

[0021] Figure 3 The structure schematic view of the burner head burner of the present application embodiment is shown in the figure; Figure 1 The sectional structure schematic view of the burner head burner is shown in the figure;

[0022] Figure 4 The sectional structure schematic view of the burner head burner is shown in the figure; Figure 1 The sectional structure schematic view of the burner head burner is shown in the figure.

[0023] Reference signs:

[0024] The main body assembly 100, the air distribution cavity 101, the outer ring air cavity 102, the connecting passage 103, the main body seat 110, the air inlet 111, the connecting column 112, the connecting hole 113, the flow distribution part 114, the air passage 115, the seat cover 120, the outer ring fire hole 121, the threaded hole 122, the flame stabilizing hole 123;

[0025] The central fire cover 200, the central air cavity 201, the central fire hole 202, and the flame stabilizing groove 203. DETAILED DESCRIPTION

[0026] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, are for the purpose of explanation only and are not to be construed as limiting the present application.

[0027] In the description of the present application, it is to be understood that, if the orientation description is involved, for example, the orientation or position relationship indicated by the upper, lower, front, rear, left, right and the like is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0028] In the description of the present application, if the words such as several, greater than, less than, more than, above, below, within and the like appear, wherein the meaning of several is one or more, the meaning of more than is two or more, greater than, less than, more than and the like are understood as not including the number, above, below, within and the like are understood as including the number.

[0029] If the first, second is described for the purpose of distinguishing technical features, it cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0030] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting and the like should be broadly understood, and the skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical scheme.

[0031] Referring to Figure 1 , Figure 2 , Figure 3 and Figure 4The application discloses a furnace head burner which comprises a main body assembly 100 and a center fire cover 200, the lower middle part of the main body assembly 100 is provided with an air inlet channel 111, the main body assembly 100 is provided with a gas distribution cavity 101 and an outer ring gas cavity 102, the air inlet channel 111 is communicated with the lower side of the gas distribution cavity 101, the outer ring gas cavity 102 is annular and located at the outer periphery of the gas distribution cavity 101, a connecting channel 103 is arranged between the gas distribution cavity 101 and the outer ring gas cavity 102 and communicates with each other through the connecting channel 103, the connecting channel 103 is provided with a plurality of connecting channels 103 which are uniformly and spacedly distributed around the gas distribution cavity 101, the connecting channel 103 is provided with a shunt structure at the abutting communication part with the outer ring gas cavity 102, the main body assembly 100 is provided with an outer ring fire hole 121 for outputting gas corresponding to the outer ring gas cavity 102, and the center fire cover 200 is arranged on the upper side of the main body assembly 100 and defines a center gas cavity 201 with the main body assembly 100, the center gas cavity 201 is communicated with the upper side of the gas distribution cavity 101, and the center fire cover 200 is provided with a center fire hole 202 for outputting gas corresponding to the center gas cavity 201.

[0032] As shown in Figure 1 、 Figure 2 、 Figure 3 and Figure 4 , the gas distribution cavity 101 is located at the upper side of the air inlet channel 111 and communicated with the air inlet channel 111, the center gas cavity 201 is located at the upper side of the gas distribution cavity 101 and communicated with the gas distribution cavity 101, the connecting channel 103 is provided with four connecting channels 103 which are uniformly and spacedly distributed around the gas distribution cavity 101, each connecting channel 103 is provided with a shunt structure at the abutting communication part with the outer ring gas cavity 102, so as to shunt the gas output by the connecting channel 103 to the outer ring gas cavity 102 on both sides of the gas outlet end, the outer ring fire hole 121 is provided with a plurality of outer ring fire holes 121 which are uniformly and spacedly distributed around the center of the main body assembly 100, and the center fire hole 202 is also provided with a plurality of center fire holes 202 which are uniformly and spacedly distributed around the center of the center fire cover 200.

[0033] In use, the gas is input from the air inlet channel 111 to the gas distribution cavity 101, part of the gas in the gas distribution cavity 101 enters the center gas cavity 201 and is output from the center fire hole 202 for combustion, and the remaining gas in the gas distribution cavity 101 enters the plurality of connecting channels 103 and is transported to different positions of the outer ring gas cavity 102 through the connecting channel 103, because the plurality of connecting channels 103 are uniformly and spacedly distributed around the gas distribution cavity 101, the gas can be uniformly transported to multiple positions of the outer ring gas cavity 102, and then the shunt structure at the abutting communication part of the connecting channel 103 and the outer ring gas cavity 102 is used for shunting, so that the gas amount and the gas pressure at each position of the outer ring gas cavity 102 can be more uniform, which is beneficial to improving the uniformity of the outer ring gas output, ensuring the uniformity of the outer ring firepower and achieving a better heating effect.

[0034] In practical application, the connecting channel 103 can also be provided with three or five, and the specific structure of the main body assembly 100, the center fire cover 200, etc. can be set according to actual use needs, which will not be described in detail here, and will be described in detail below.

[0035] In some embodiments, the main body assembly 100 includes a main body seat 110 and a seat cover 120, the air inlet channel 111 is arranged at the lower middle part of the main body seat 110, the seat cover 120 is arranged at the upper side of the main body seat 110 and defines the air distribution cavity 101 and the outer ring air cavity 102 with the main body seat 110, and the center fire cover 200 is arranged at the upper middle part of the seat cover 120 and defines the center air cavity 201 with the seat cover 120.

[0036] As can be understood, as shown in Figure 1 , Figure 2 , Figure 3 and Figure 4 , the outer ring fire hole 121 is arranged on the seat cover 120, the seat cover 120 is arranged at the upper side of the main body seat 110 and defines the air distribution cavity 101, the connecting channel 103 and the outer ring air cavity 102 with the main body seat 110, the air inlet channel 111 is arranged at the lower middle part of the main body seat 110, and the center fire cover 200 is arranged at the upper middle part of the seat cover 120 and defines the center air cavity 201 with the seat cover 120. Such a structure design is beneficial to the manufacturing and processing of the air distribution cavity 101, the connecting channel 103, the outer ring air cavity 102 and the center air cavity 201, and is convenient to use. In practical application, in addition to the above structure, the air distribution cavity 101 and the connecting channel 103, etc. can also be directly processed on the main body seat 110, and the outer ring fire cover can be arranged on the main body seat 110. The specific setting can be made according to the actual use needs.

[0037] In some embodiments, the center fire cover 200 and the seat cover 120 are connected and fixed through a threaded structure. As can be understood, as shown in Figure 2 , Figure 3 and Figure 4 , the inner wall of the center air cavity 201 is provided with an internal thread, the outer periphery of the center fire cover 200 is provided with an external thread, and the center fire cover 200 is arranged on the seat cover 120 and connected through the internal and external threads. The connection and fixation are realized, the structure is simple, the connection is stable and reliable, and the use is convenient. In practical application, in addition to the above structure, the center fire cover 200 and the seat cover 120 can also be connected through an additional threaded part, or the center fire cover 200 can also be placed on the seat cover 120. The specific changes can be made according to the actual use needs.

[0038] In some embodiments, the main body seat 110 and the seat cover 120 are connected and fixed through a threaded structure. As can be understood, as shown in Figure 2 , Figure 3 and Figure 4As shown, the main body seat 110 is provided with a plurality of connecting columns 112, each of which is provided with a through connecting hole 113, and the seat cover 120 is provided with a threaded hole 122 corresponding to the connecting column 112. In use, the threaded rod portion of the threaded part is arranged through the connecting hole 113 and cooperates with the threaded hole 122, so as to realize the connection and fixation between the main body seat 110 and the seat cover 120. The structure is simple, the connection is stable and reliable, and the use is convenient. In actual application, in addition to the above structure, the connection of the center fire cover 200 can also be referred to, and the connection between the main body seat 110 and the seat cover 120 is realized by arranging the inner and outer threads in a screwing manner. Alternatively, the seat cover 120 can also be placed on the main body seat 110. The specific changes can be made according to the actual use needs.

[0039] In some embodiments, the main body seat 110 is provided with a connecting column 112, which is located at the abutting and communicating position of the connecting channel 103 and the outer ring gas cavity 102 and is used for connecting the seat cover 120. The shunt structure includes a shunt part 114 arranged on the connecting column 112. The shunt part 114 is arranged towards the gas outlet end of the connecting channel 103 and is used for shunting the gas output by the connecting channel 103 to both sides of the connecting column 112.

[0040] As shown in Figure 2 , Figure 3 and Figure 4 , the connecting column 112 is provided with four connecting columns 112, which are respectively arranged corresponding to the four connecting channels 103. The connecting column 112 is located at the abutting and communicating position of the corresponding connecting channel 103 and the outer ring gas cavity 102. The connecting column 112 is provided with a shunt part 114 on the side towards the gas outlet end of the connecting channel 103. The shunt part 114 has two inclined surfaces and is roughly sharp-shaped, so as to be able to shunt the gas output by the connecting channel 103 to both sides of the connecting column 112, thereby shunting the gas to the outer ring gas cavities 102 on both sides. The structure is simple and convenient to manufacture and use. In actual application, in addition to the above structure, the shunt structure can also include a shunt piece arranged at the gas outlet end of the connecting channel 103 to guide and shunt the gas output by the connecting channel 103. The specific structure of the shunt structure can also be changed according to the actual use needs.

[0041] In some embodiments, the lower side of the center gas cavity 201 is a necked structure, so that the diameter size of the gas inlet of the center gas cavity 201 is smaller than that of the gas inlet of the gas distribution cavity 101.

[0042] As shown in Figure 2 , Figure 3 and Figure 4As shown, the lower side of the central air cavity 201 is in a necked structure, so that the diameter size of the air inlet of the central air cavity 201 is smaller than that of the air inlet of the air distribution cavity 101, which is beneficial to avoid excessive gas from the air distribution cavity 101 into the central air cavity 201, and ensure the reasonable distribution of gas in the central air cavity 201 and the outer ring air cavity 102, facilitating use. In actual application, the specific ratio of the diameter size of the air inlet of the central air cavity 201 to the diameter size of the air inlet of the air distribution cavity 101 can be set according to actual use needs.

[0043] In some embodiments, the outer ring fire hole 121 is provided with a plurality of and uniformly distributed around the central fire cover 200, and each outer ring fire hole 121 is provided with a flame stabilizing hole 123 on the side, which is in communication with the outer ring air cavity 102.

[0044] As can be understood, as shown in Figure 1 , Figure 2 , the plurality of outer ring fire holes 121 are spirally arranged, so that the gas output by the plurality of outer ring fire holes 121 can form a spiral gas flow to achieve a rotating flame effect; by providing the flame stabilizing hole 123 on the side of each outer ring fire hole 121, which is in communication with the outer ring air cavity 102, the stability of the outer ring flame can be increased, and a better heating effect can be achieved. In actual application, the flame stabilizing hole 123 can be set according to actual use needs.

[0045] In some embodiments, the central fire hole 202 is provided with a plurality of and uniformly distributed along the outer periphery of the central fire cover 200, and the central fire cover 200 is provided with a flame stabilizing groove 203 below the central fire hole 202, which is in communication with the central air cavity 201.

[0046] As can be understood, as shown in Figure 1 , Figure 2 , Figure 3 and Figure 4 , the plurality of central fire holes 202 are uniformly distributed along the outer periphery of the central fire cover 200, and the flame stabilizing groove 203 is arranged on the outer periphery of the central fire cover 200 and below the central fire hole 202, and the flame stabilizing groove 203 is annular and in communication with the central air cavity 201 through a plurality of air holes. By providing the flame stabilizing groove 203, the stability of the central flame can be increased, and a better heating effect can be achieved. In actual application, the flame stabilizing groove 203 can be set according to actual use needs.

[0047] In some embodiments, the peripheral side of the main body assembly 100 is provided with an air passage 115, and the air passage 115 is provided with a plurality of and uniformly distributed along the outer periphery of the main body assembly 100, and the air passage 115 is used for air supplement on the peripheral side of the main body assembly 100 to enter the peripheral side of the central fire cover 200.

[0048] As can be understood, as shown in Figure 1 , Figure 2 andFigure 4 As shown, four air passages 115 are provided, which are evenly spaced along the outer periphery of the main body assembly 100, and the air passages 115 are communicated between the outer periphery side of the main body assembly 100 and the outer periphery side of the central fire cap 200, so that the air on the outer periphery side of the main body assembly 100 can be supplemented into the outer periphery side of the central fire cap 200 through the air passages 115, which is beneficial to the sufficient combustion of the central and outer ring output gas, and facilitates use.

[0049] According to the second aspect of the utility model, the gas stove comprises the burner according to the first aspect of the utility model.

[0050] According to the second aspect of the utility model, the gas stove comprises the burner according to the first aspect of the utility model.

[0051] Since other configurations of the gas stove of the utility model are known to those skilled in the art, they will not be described in detail here.

[0052] The utility model has been described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range of those skilled in the art without departing from the purpose of the utility model.

Claims

1. A burner tip, comprising: The burner head comprises: a main body assembly, a middle lower side of which is provided with an air inlet channel, the main body assembly is provided with a gas distribution cavity and an outer ring gas cavity, the air inlet channel is connected to a lower side of the gas distribution cavity, the outer ring gas cavity is annular and located at an outer periphery of the gas distribution cavity, a connecting channel is arranged between the gas distribution cavity and the outer ring gas cavity and the two cavities are connected through the connecting channel, the connecting channel is provided with a plurality of connecting channels and is uniformly distributed around the gas distribution cavity, a flow distribution structure is arranged at a connecting position of the connecting channel and the outer ring gas cavity, and the main body assembly is provided with an outer ring fire hole for outputting fuel gas corresponding to the outer ring gas cavity; a center fire cover, which is arranged on an upper side of the main body assembly and defines a center gas cavity with the main body assembly, the center gas cavity is connected to an upper side of the gas distribution cavity, and the center fire cover is provided with a center fire hole for outputting fuel gas corresponding to the center gas cavity.

2. The burner tip of claim 1, wherein The main body assembly comprises a main body seat and a seat cover, the air inlet channel is arranged on a middle lower side of the main body seat, and the seat cover is arranged on an upper side of the main body seat and defines the gas distribution cavity and the outer ring gas cavity with the main body seat, and the center fire cover is arranged on a middle upper side of the seat cover and defines the center gas cavity with the seat cover.

3. The burner tip of claim 2, wherein, The center fire cover and the seat cover are connected and fixed through a threaded structure.

4. The burner tip of claim 2, wherein The main body seat and the seat cover are connected and fixed through a threaded structure.

5. The burner tip of claim 2, wherein The main body seat is provided with a connecting column, the connecting column is located at a connecting position of the connecting channel and the outer ring gas cavity and is used for connecting the seat cover, and the flow distribution structure comprises a flow distribution part arranged on the connecting column, the flow distribution part is arranged towards an air outlet end of the connecting channel and is used for distributing fuel gas output by the connecting channel to both sides of the connecting column.

6. The burner tip of claim 1, wherein A lower side of the center gas cavity is a necked structure, so that a diameter of an air inlet of the center gas cavity is smaller than a diameter of an air inlet of the gas distribution cavity.

7. The burner tip of claim 1, wherein The outer ring fire hole is provided with a plurality of outer ring fire holes and is uniformly distributed around the center fire cover, a flame stabilizing hole is arranged on a side of each outer ring fire hole, and the flame stabilizing hole is connected to the outer ring gas cavity.

8. The burner tip of claim 1, wherein The center fire hole is provided with a plurality of center fire holes and is uniformly distributed along an outer periphery of the center fire cover, the center fire cover is provided with a flame stabilizing groove below the center fire hole, and the flame stabilizing groove is connected to the center gas cavity.

9. The burner tip of claim 1, wherein A side of the main body assembly is provided with an air channel, the air channel is provided with a plurality of air channels and is uniformly distributed along an outer periphery of the main body assembly, and the air channel is used for supplementing air on the outer periphery of the main body assembly to a side of the center fire cover.

10. A gas hob, characterized in that The burner head comprises: a main body assembly, a middle lower side of which is provided with an air inlet channel, the main body assembly is provided with a gas distribution cavity and an outer ring gas cavity, the air inlet channel is connected to a lower side of the gas distribution cavity, the outer ring gas cavity is annular and located at an outer periphery of the gas distribution cavity, a connecting channel is arranged between the gas distribution cavity and the outer ring gas cavity and the two cavities are connected through the connecting channel, the connecting channel is provided with a plurality of connecting channels and is uniformly distributed around the gas distribution cavity, a flow distribution structure is arranged at a connecting position of the connecting channel and the outer ring gas cavity, and the main body assembly is provided with an outer ring fire hole for outputting fuel gas corresponding to the outer ring gas cavity; a center fire cover, which is arranged on an upper side of the main body assembly and defines a center gas cavity with the main body assembly, the center gas cavity is connected to an upper side of the gas distribution cavity, and the center fire cover is provided with a center fire hole for outputting fuel gas corresponding to the center gas cavity.

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