CN220338462U - Inner fire cover, burner and kitchen range - Google Patents

Abstract

The utility model relates to an inner fire cover, and a burner and a stove comprising the inner fire cover. The inner fire cover comprises a fire cover main body and a partition plate. The projection of the fire cover main body along the axial direction of the fire cover main body is in an annular structure, and a plurality of fire groove groups distributed at intervals along the circumferential direction of the fire cover main body are arranged at the top of the fire cover main body; the baffle connect in the centre of fire lid main part, the baffle has seted up the first through-hole that supplies the ignition needle to pass, the aperture of first through-hole is greater than the diameter of ignition needle, in order to form the clearance between baffle with the ignition needle. According to the inner fire cover, the partition plate is arranged in the center of the fire cover main body, so that the combustor, cheng Yepan and other parts are prevented from being aged due to the fact that unburnt complete fuel gas is pressed down, the safety is improved, the gap between the second through hole and the ignition needle is reduced, the air supplement flow area is reduced, and the secondary supplement air is accelerated to pass through the gap rapidly.

Description

Inner fire cover, burner and kitchen range

Technical Field

The utility model relates to the technical field of kitchen appliances, in particular to an inner fire cover, a burner comprising the inner fire cover and a kitchen range comprising the burner.

Background

The gas range is generally classified into a direct-fire gas range and a rotary-fire gas range according to a gas outlet manner in which gas passes through the gas outlet holes. The exhaust hole of the direct-fired gas stove is vertically upwards arranged by a plurality of round holes, and the adjusting valve and the air door of the direct-fired gas stove can ensure uniform combustion, so that the combustion strength is good, the firepower is high, the secondary air ratio is uniform, the combustion is sufficient, and the heat absorption is complete. Compared with a direct-fire gas stove, the gas exhaust hole of the rotary-fire gas stove is strip-shaped and spiral, and the area covered by combustion is large and more uniform. The flame can be better distributed on the bottom of a relatively flat pan, and the heating surface is wider. The conversion rate of the rotary fire is higher than that of the direct fire type gas stove, so that the gas is saved, but the relative fire power is not as great as that of the direct fire type gas stove.

At present, in order to obtain higher energy efficiency, the rotary fire type gas stove can control the height of the pot support to be lower. When a user cooks with a non-pan (such as a sharp-bottomed pan, a round-bottomed pan and the like), because the internal rotation flame is concentrated and the height of the pan support is low, the pan is relatively close to the internal rotation flame of the burner, and insufficient combustion of fuel gas can be caused due to insufficient air inflow of air. The insufficiently combusted fuel gas not only can cause the content of carbon monoxide and the like in the dry flue gas to be increased, but also can be mixed with air at the secondary air supplementing port of the distributor, the mixed gas is ignited by flame on the fire cover and then is stably combusted at the port of the air passage, the aging of parts such as a combustor, cheng Yepan and the like is accelerated, and serious safety accidents are easily caused.

Disclosure of Invention

The present utility model is directed to solving at least one of the problems discussed above and/or other problems in the prior art.

To achieve the above object, according to one aspect of the present utility model, there is provided an inner fire cover including a fire cover main body and a partition plate. The projection of the fire cover main body along the axial direction of the fire cover main body is in an annular structure, and a plurality of fire groove groups distributed at intervals along the circumferential direction of the fire cover main body are arranged at the top of the fire cover main body; the baffle connect in the centre of fire lid main part, the baffle has seted up the first through-hole that supplies the ignition needle to pass, the aperture of first through-hole is greater than the diameter of ignition needle, in order to form the clearance between baffle with the ignition needle.

According to the inner fire cover, the partition plate is arranged in the center of the fire cover main body, so that the gas flow area of the center area of the fire cover main body can be properly reduced, the resistance of the gas pressed down by the cooker to flow to the bottom along the center area of the fire cover main body is increased, and therefore the aging of parts such as a burner, cheng Yepan and the like caused by the fact that the gas is not completely combusted is prevented, and the safety is improved. The clearance between the second through hole of the baffle and the ignition needle reduces the flow area of air supplement and quickens the air which is secondarily supplemented to pass through the clearance.

According to one embodiment of the utility model, the fire cover main body comprises a fire cover inner wall which is arranged at the inner side of the fire cover main body and extends along the axial direction of the fire cover main body, at least one group of pressure relief holes are formed in the fire cover inner wall, and the partition plate is connected to the bottom of the fire cover inner wall, which is far away from the fire groove group. The structure can prevent the danger of overlarge pressure caused by gas backlog after the fire tank group is blocked by oil stains.

According to one embodiment of the utility model, the fire cover main body comprises a fire cover top wall connected to the top of the fire cover inner wall and extending radially along the fire cover top wall, the fire groove group is arranged on the fire cover top wall, and the fire cover inner wall is provided with an anti-fouling protrusion on one side of the pressure release hole, which is close to the fire cover top wall. The structure can prevent more greasy dirt from flowing into the pressure relief hole along the inner wall of the ignition cover.

According to one embodiment of the utility model, the number of the pressure relief holes is two, the two pressure relief holes are symmetrically arranged on the inner wall of the fire cover by the central axis of the fire cover main body, and the two antifouling protrusions are arranged in one-to-one correspondence with the two pressure relief holes.

According to an embodiment of the present utility model, each of the fire groove groups includes a main fire groove and a flame stabilizing groove extending in a radial direction of the top wall of the fire cover, respectively, the flame stabilizing groove being provided at one side of the main fire groove.

According to one embodiment of the utility model, a mounting hole for mounting a thermocouple or an induction needle is arranged between every two adjacent fire groove groups on one side of the fire cover top wall close to the inner wall of the fire cover.

According to one embodiment of the utility model, a positioning plate is arranged at one end of the inner wall of the fire cover, which is connected with the partition plate, and extends along the axial direction of the inner wall of the fire cover and towards one side far away from the fire groove group.

According to another aspect of the present utility model, there is provided a burner including the inner flame cover as described above, the flame divider being formed with an inner ring air passage therebetween, a plurality of outer ring air passages circumferentially disposed around the inner ring air passage, and at least one air passage disposed between two adjacent outer ring air passages, the top of the air passage being provided with a second through hole; the partition plate cover is arranged at the second through hole so that air in the air channel can flow to the fire groove group through the gap.

According to one embodiment of the utility model, the air channel penetrates through the inner ring air channel along the radial direction of the fire dividing piece, the second through holes are coaxially arranged with the inner ring air channel, the number of the outer ring air channels is four, and two outer ring air channels are respectively arranged at intervals on two sides of the air channel.

According to an embodiment of the present utility model, the air passage includes a first section and a second section which are arranged in a central symmetry manner with respect to a central axis of the second through hole and are communicated, the first section and the second section are each horn-shaped, and a caliber of one of the first section and the second section gradually increases when extending in a direction away from the other. The structure can suck more air, and ensures that a sufficient amount of air flows to the fire groove group through the gap.

According to one embodiment of the utility model, the inner side wall of the inner ring air channel is provided with a boss extending inwards along the radial direction of the inner ring air channel, the baffle is abutted against the boss, and the boss is provided with a positioning groove for inserting the positioning plate. The structure can prevent the relative rotation of the fire cover main body and the fire dividing member in the axial direction.

According to one embodiment of the utility model, the burner further comprises a base, and the base is provided with an inner ring injection pipe communicated with the inner ring air passage and an outer ring injection pipe communicated with the outer ring air passage.

According to a further aspect of the present utility model there is provided a cooktop comprising an inner fire cover or burner according to the above.

Drawings

The features and advantages of the present utility model will be apparent from the detailed description provided hereinafter with reference to the accompanying drawings. It is to be understood that the following drawings are merely schematic and are not necessarily drawn to scale, and are not to be construed as limiting the utility model, in which:

fig. 1 illustrates a perspective view of an inner fire cover according to an exemplary embodiment of the present utility model.

FIG. 2 illustrates a perspective view of a burner according to an exemplary embodiment of the present utility model.

Fig. 3 shows an exploded view of the burner shown in fig. 2.

Fig. 4 shows a top view of the burner shown in fig. 2.

FIG. 5 shows a cross-sectional view of the burner shown in FIG. 4 along line A-A.

FIG. 6 shows a cross-sectional view of the burner shown in FIG. 4 along line B-B.

Fig. 7 shows a perspective view of a flame divider of the burner shown in fig. 2.

Reference numerals illustrate:

1. a fire cover body; 11. a fire trough group; 111. a main fire tank; 112. a firework stabilizing groove; 12. the inner wall of the fire cover; 121. a pressure relief hole; 122. an anti-fouling protrusion; 123. a positioning plate; 13. a fire cover top wall; 131. a mounting hole; 14. the outer wall of the fire cover; 2. an ignition needle; 3. a partition plate; 31. a first through hole; 4. a gap; 5. a fire dividing member; 51. an inner annular airway; 511. a boss; 5111. a positioning groove; 52. an outer annular airway; 53. an air passage; 531. a second through hole; 6. a base; 61. an inner ring injection pipe; 62. an outer ring injection pipe; 7. and an external fire cover.

Detailed Description

Embodiments of the present utility model are described below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding and enabling description of the utility model to one skilled in the art. It will be apparent, however, to one skilled in the art that the present utility model may be practiced without some of these specific details. Furthermore, it should be understood that the utility model is not limited to specific described embodiments. Rather, any combination of the features and elements described below is contemplated to implement the utility model, whether or not they relate to different embodiments. Thus, the following aspects, features, embodiments and advantages are merely illustrative and should not be considered elements or limitations of the claims except where explicitly set out in a claim.

Terms such as "first," "second," and the like are used hereinafter to describe elements of the present application, and are merely used for distinguishing between the elements and not for limiting the nature, order, or number of such elements. The terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components other than the listed elements/components.

Fig. 1 shows an inner fire cover according to an embodiment of the utility model. The inner fire cover according to this embodiment includes a fire cover main body 1 and a partition plate 3. The fire cover main body 1 is in an annular structure along the axial projection thereof, and an annular cavity structure through which fuel gas flows is formed inside the fire cover main body 1. The top of fire lid main part 1 is provided with a plurality of fire groove groups 11 along its axial interval distribution, and the gas in the annular cavity structure can flow out of the fire lid main part 1 through fire groove groups 11 to form the spiral fire at the top of fire lid main part 1, and the air can flow to fire groove groups 11 department through the centre of this fire lid main part 1 and carry out secondary air to the flame of fire groove groups 11 department and supply. The baffle 3 is connected in the centre of fire lid main part 1, blocks off the centre of annular structure's fire lid main part 1 to set up the first through-hole 31 that supplies firing pin 2 to pass on baffle 3, the aperture of first through-hole 31 is greater than the diameter of firing pin 2, thereby forms clearance 4 between baffle 3 and firing pin 2. The partition plate 3 can properly reduce the gas flow area of the central area of the fire cover main body 1, and increase the resistance of the gas pressed down by the cooker to flow to the bottom along the central area of the fire cover main body 1, so that the aging of parts such as a burner, cheng Yepan and the like caused by the pressing down of the unburnt complete gas is avoided, and the safety is improved. Compared with the prior art, the gap 4 between the baffle plate 3 and the ignition needle 2 reduces the flow area of air supplement and can accelerate the air which is supplemented secondarily to pass through the gap 4 rapidly.

According to a specific exemplary embodiment of the fire cover body 1, as shown in fig. 1, the fire cover body 1 mainly includes a fire cover outer wall 14, a fire cover top wall 13, and a fire cover inner wall 12, which are sequentially connected from outside to inside in the radial direction thereof. Wherein the inner wall 12 and the outer edge extend along the axial direction of the main body 1, and the top wall 13 extends from the top edge of the outer wall 14 to the top edge of the inner wall 12 along the radial direction of the main body 1, so that the cross section of the main body 1 is in a shape like an inverted U.

Specifically, referring to fig. 1 and 2, at least one group of pressure relief holes 121 is formed in the inner wall 12 of the fire cover for reintroducing the incompletely combusted fuel gas into the annular cavity structure, so as to prevent the risk of excessive pressure caused by gas backlog after the fire groove group 11 is blocked by oil stains. The partition plate 3 is connected to the bottom of the inner wall 12 of the fire cover away from the fire groove group 11 (or the bottom of the side of the inner wall 12 of the fire cover away from the top wall 13 of the fire cover), so that the pressure release holes 121 can be provided in the effective pressure release area between the fire groove group 11 and the partition plate 3. In a further exemplary embodiment, in order to further block the oil dirt from flowing into the pressure relief hole 121 along the inner wall 12 of the fire cover, the inner wall 12 of the fire cover is provided with an anti-fouling protrusion 122 on the side of the pressure relief hole 121 close to the top wall 13 of the fire cover (which may be the side of the inner wall 12 of the fire cover close to the fire groove group 11). The anti-fouling protrusion 122 extends radially inward of the fire cover body 1 a distance such that oil can flow to the partition plate 3 via the inner edge of the anti-fouling protrusion 122. It should be understood that the pressure relief is performed by only setting the pressure relief hole 121 in the inner wall 12 of the fire cover in this embodiment, and the present utility model is not limited to this, and may be implemented by setting a corresponding pressure relief member in the partition plate 3 or other positions, so long as the central area of the fire cover main body 1 can be timely relieved.

As a preferred exemplary embodiment of the pressure relief holes 121 and the anti-fouling protrusions 122, as shown in fig. 2 and 5, the number of the pressure relief holes 121 is two, the number of each pressure relief hole 121 is three, the two pressure relief holes 121 are symmetrically arranged on the inner wall 12 of the fire cover with the central axis of the fire cover main body 1, and the two anti-fouling protrusions 122 are respectively arranged in one-to-one correspondence with the two pressure relief holes 121, so as to sufficiently satisfy the pressure relief requirement of the fire cover main body 1. In other specific exemplary embodiments, the number of the pressure relief holes 121 may be one, two or more, and the number of the pressure relief holes 121 in each group may be set according to practical situations, such as the diameter of the pressure relief holes 121, the pressure value to be considered for unloading, and the like.

As a specific exemplary embodiment of the flame groove groups 11, as shown in fig. 1, the inner side portion of the flame cover top wall 13 is provided obliquely to the partition plate 3 side, and the outer side portion of the flame cover top wall 13 is provided extending in the radial direction of the flame cover main body 1, the inner end of each flame groove group 11 penetrates the inner side portion to the flame cover inner wall 12, and the air flowing upward from the gap 4 supplements the flame at the inner end of the flame groove group 11 with secondary air. The outer end of each fire groove group 11 extends to be close to the fire cover outer wall 14 or penetrates through the fire cover outer wall 14, and air outside the inner fire cover can directly supplement secondary air to the outer end of the fire groove group 11, so that flames at the fire groove group 11 are brighter and clearer. Each fire slot group 11 may include a main fire slot 111 and an sniffing fire slot 112 extending in a radial direction of the fire cover top wall 13, respectively. The main fire groove 111 has a relatively large width, and may be arranged in the radial direction of the fire cover main body 1 or may be arranged in a spiral shape, and the gas is ignited by the main fire groove 111 to generate a spiral fire. The width of the smell fire groove 112 is smaller than that of the main fire groove 111, and the smell fire groove is arranged on one side of the main fire groove 111, so that the problem of flame separation of the main fire groove 111 can be solved.

In a further embodiment, as shown in fig. 1, a mounting hole 131 for mounting a thermocouple or an induction needle is provided between each two adjacent fire groove groups 11 corresponding to one side of the fire cover top wall 13 close to the fire cover inner wall 12. In other embodiments, the mounting holes 131 may also be used as auxiliary fire holes for the fire box assembly 11 when no thermocouple or sensing pin is installed to facilitate increased thermal loads. It is understood that the thermal load refers to the maximum heat released by the gas during combustion of the gas range, and is also the power that the gas can output.

The utility model also provides a burner comprising the inner fire cover. Fig. 2 to 6 show a specific structure of the burner, which mainly includes the fire dividing member 5, the outer fire cover 7, and the inner fire cover enumerated in the above embodiments. As an exemplary embodiment of the flame-dividing member 5, the flame-dividing member 5 is formed with an inner ring air passage 51 located therebetween, a plurality of outer ring air passages 52 provided annularly in the circumferential direction of the inner ring air passage 51, and at least one air passage 53 provided between adjacent two of the outer ring air passages 52. The outer end of the air channel 53 extends to the periphery of the fire dividing member 5, the inner end of the air channel 53 can extend to the middle of the fire dividing member 5 and is isolated from and communicated with the inner ring air channel 51, and through arranging the second through hole 531 which is coaxial with but not communicated with the inner ring air channel 51 at the position of the top of the air channel 53 corresponding to the center of the inner ring air channel 51, when the fire cover main body 1 covers the inner ring air channel 51 so that the annular cavity structure can be communicated with the inner ring air channel 51, the partition plate 3 covers the second through hole 531, so that air in the air channel 53 can flow to the fire groove group 11 through the second through hole 531 and the gap 4 at the first through hole 31. When the gas at the fire groove group 11 burns, the temperature of the gas close to the center of the fire dividing piece 5 is higher, the gas is heated to flow to one side of the fire groove group 11, the pressure at the top of the central area of the fire cover main body 1 is higher than the pressure at the bottom to form pressure difference, and at the moment, the independent air channel 53 can rapidly suck air to supplement secondary air to the inner end of the fire groove group 11 through the second through hole 531 and the gap 4, so that the combustion of the gas is more sufficient. It will be appreciated that the inner annular air passage 51 is circular in cross section and has inner and outer side walls to form a passage therebetween through which the fuel gas flows, such that the intermediate position of the inner annular air passage 51 is hollow, and the second through holes 531 of the air passages 53 communicate with the intermediate region of the fire cover main body 1 at the intermediate position.

Further, as shown in fig. 7, in this embodiment, four outer ring air passages 52 are mainly shown to be arranged around the circumference of the fire dividing member 5 at equal intervals along the circumference of the fire dividing member 5, each outer ring air passage 52 is in a fan shape, and a certain interval is formed between every two adjacent outer ring air passages 52. The air channels 53 extend through the fire dividing member 5 along the radial direction between the two adjacent outer ring air channels 52, so that two sections of air channels 53 are respectively formed on two radially symmetrical sides (two sides of the second through hole 531) of the inner ring air channel 51, the air flow rate at the position of entering the gap 4 is further increased, and the air with the maximum flow rate can be ensured to be supplemented at the inner end of the air groove group. In other specific embodiments, the number of outer ring air passages 52 may be two, three or even more, each outer ring air passage 52 also being fan-shaped and arranged along the circumference of the flame-dividing element 5 with a space between two adjacent outer ring air passages 52 and provided with air passages 53. Each air passage 53 formed on the flame divider 5 converges inward in the radial direction of the flame divider 5 to the center of the inner ring air passage 51, and a second through hole 531 is opened at the top of the convergence.

In a further exemplary embodiment of the air passage 53, the air passage 53 includes a first section and a second section which are arranged in central symmetry with respect to a central axis of the second through hole 531 and are communicated, and the first section and the second section are each horn-shaped. Wherein the first section gradually increases in caliber when extending in a direction away from the second section, the second section also gradually increases in caliber when extending in a direction away from the first section, and the first section and the second section converge at a central position of the inner annular air passage 51 after passing through the inner annular air passage 51. The horn-shaped first and second sections may further increase the speed of the inhaled air.

In order to prevent the air in the air passage 53 from flowing more effectively to the inner end of the fire groove group 11, a boss 511 extending radially inward thereof may be provided on the inner side wall of the inner annular air passage 51. As shown in fig. 6 and 7, the boss 511 is annular and extends in the circumferential direction of the inner wall of the inner ring air passage 51, and a positioning groove 5111 is provided on one side of the annular boss 511. The bottom of the inner wall 12 of the fire cover (i.e., the end to which the partition plate 3 is attached) is provided with a positioning plate 123, and the positioning plate 123 extends in the axial direction of the inner wall 12 of the fire cover and toward the side away from the fire groove group 11 (i.e., the top wall 13 of the fire cover). When the fire cover main body 1 is covered on the inner ring air passage 51, the partition plate 3 can be abutted against the boss 511, so that air in the air passage 53 can flow to the inner end of the fire groove group 11 only through the second through holes 531 and the gaps 4, and the relative rotation of the fire cover main body 1 and the fire distributing member 5 in the axial direction can be prevented through the positioning groove 5111 and the positioning plate 123. It will be appreciated that in other embodiments, the limiting structure may be provided at other positions for limiting the fire cover main body 1 and the fire dividing member 5 in the axial direction, including, but not limited to, providing the positioning plate 123 at the bottom of the fire cover inner wall 12 and providing the positioning groove 5111 at one side of the boss 511.

In a further exemplary embodiment of the burner, as shown in fig. 2 to 6, the burner further comprises a base 6, the base 6 being formed with an inner ring injection pipe 61 communicating with the inner ring air duct 51 and an outer ring injection pipe 62 communicating with the outer ring air duct 52. The outer fire cover 7 has an outer fire groove and covers the top of the outer ring air passages 52 so that the inner cavity of the outer fire cover 7 communicates with the top of each outer ring air passage 52. The inner fire cover is arranged at the top of the inner ring air passage 51 and is communicated with the top of the inner ring air passage 51 by an annular cavity structure inside the inner fire cover. The bottom of the outer ring air flue 52 is communicated with the outer ring injection pipe 62, and the bottom of the inner ring air flue 51 is communicated with the inner ring injection pipe 61, so that fuel gas sequentially flows through the outer ring air flue 52 and the outer fire cover 7 after entering the outer ring injection pipe 62 and then burns at the outer fire groove, and simultaneously, fuel gas sequentially flows through the inner ring air flue 51 and the inner fire cover after entering the inner ring injection pipe 61 and then burns at the fire groove group 11.

The utility model also provides a kitchen range comprising the inner fire cover or the burner.

It will be apparent to those skilled in the art that various modifications and variations can be made to the embodiments disclosed above without departing from the scope or spirit of the utility model. Other embodiments of the utility model will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. It is intended that the specification and examples disclosed herein be considered as exemplary only, with a true scope of the utility model being indicated by the following claims and their equivalents.

Claims (13)

1. An inner fire cover, comprising:

the fire cover comprises a fire cover main body (1), wherein the projection of the fire cover main body (1) along the axial direction of the fire cover main body is of an annular structure, and a plurality of fire groove groups (11) distributed at intervals along the circumferential direction of the fire cover main body are arranged at the top of the fire cover main body; and

the fire cover comprises a partition plate (3), wherein the partition plate (3) is connected to the middle of the fire cover main body (1), a first through hole (31) for an ignition needle (2) to pass through is formed in the partition plate (3), and the aperture of the first through hole (31) is larger than the diameter of the ignition needle (2) so as to form a gap (4) between the partition plate (3) and the ignition needle (2).

2. An inner fire cover according to claim 1, characterized in that the fire cover main body (1) comprises a fire cover inner wall (12) which is arranged on the inner side of the annular structure and extends along the axial direction of the annular structure, the fire cover inner wall (12) is provided with at least one group of pressure relief holes (121), and the partition plate (3) is connected to the bottom of the fire cover inner wall (12) far away from the fire groove group (11).

3. An inner fire cover according to claim 2, characterized in that the fire cover main body (1) comprises a fire cover top wall (13) connected to the top of the fire cover inner wall (12) and extending radially therealong, the fire groove group (11) is opened in the fire cover top wall (13), and the fire cover inner wall (12) is provided with an anti-fouling protrusion (122) at one side of the pressure release hole (121) close to the fire cover top wall (13).

4. An inner fire cover according to claim 3, wherein the number of the pressure release holes (121) is two, the number of the pressure release holes (121) in each group is three, the two groups of pressure release holes (121) are symmetrically arranged on the inner wall (12) of the fire cover by the central axis of the fire cover main body (1), and the two antifouling protrusions (122) are arranged in one-to-one correspondence with the two groups of pressure release holes (121).

5. An inner fire cover according to claim 3, wherein each of the fire groove groups (11) comprises a main fire groove (111) and a flame stabilizing groove (112) extending in a radial direction of the fire cover top wall (13), respectively, the flame stabilizing groove (112) being provided at one side of the main fire groove (111).

6. An inner fire cover according to claim 3, characterized in that a mounting hole (131) for mounting a thermocouple or an induction needle is arranged between every two adjacent fire groove groups (11) corresponding to one side of the fire cover top wall (13) close to the fire cover inner wall (12).

7. An inner fire cover according to any one of claims 1-6, characterized in that the end of the inner fire cover wall (12) to which the partition plate (3) is connected is provided with a positioning plate (123), the positioning plate (123) extending in the axial direction of the inner fire cover wall (12) and towards the side remote from the fire groove group (11).

8. A burner, comprising:

the fire dividing piece (5), the fire dividing piece (5) is provided with an inner annular air passage (51) positioned in the middle of the fire dividing piece, a plurality of outer annular air passages (52) annularly arranged on the circumference of the inner annular air passage (51), and at least one air passage (53) arranged between two adjacent outer annular air passages (52), and a second through hole (531) is arranged at the top of the air passage (53); and

an inner fire cover according to any one of claims 1 to 7, the partition (3) being provided at the second through hole (531) to enable air of the air passage (53) to flow to the fire groove group (11) via the gap (4).

9. Burner according to claim 8, wherein said air channels (53) are arranged along the radial direction of said fire dividing member (5) and pass through said inner annular air channels (51), said second through holes (531) are arranged coaxially with said inner annular air channels (51), the number of said outer annular air channels (52) is four, and two outer annular air channels (52) are arranged at intervals on both sides of said air channels (53).

10. Burner according to claim 9, characterized in that the air channel (53) comprises a first and a second section arranged symmetrically and communicating with each other in a central axis of the second through hole (531), both the first and the second section being trumpet-shaped and the caliber of one of the first and the second section increasing when extending in a direction away from the other.

11. The burner according to claim 8, wherein the inner side wall of the inner ring air passage (51) is provided with a boss (511) extending radially inwards, the partition plate (3) is abutted against the boss (511), and the boss (511) is provided with a positioning groove (5111) into which the positioning plate (123) is inserted.

12. The burner according to claim 8, characterized in that it further comprises a base (6), said base (6) being formed with an inner ring injection pipe (61) communicating with said inner ring air duct (51) and an outer ring injection pipe (62) communicating with said outer ring air duct (52).

13. A hob characterized in, that it comprises an inner fire cover according to any one of claims 1 to 7 or a burner according to any one of claims 8 to 12.