Middle ring fire cover and combustor thereof

Abstract

The middle ring fire cover comprises a fire cover body, a middle ring gas chamber provided with a downward opening, a main fire hole set communicated with the middle ring gas chamber and formed in the outer side wall of the fire cover body, an upper gas chamber provided with an upward opening and formed in the top of the fire cover body in a concave mode, and a lower gas chamber provided with a downward opening and formed in the outer side wall of the fire cover body. The bottom face or the outer side cavity wall face of the upper gas chamber is provided with a direct fire spraying hole set communicated with the middle ring gas chamber. And the direct-spraying fire cover is mounted at the top of the fire cover body and covers the upward opening of the upper gas chamber, and a top fire hole group communicated with the upper gas chamber is formed in the direct-spraying fire cover. The middle ring fire cover solves the problem that the temperature of a pot bottom is low due to the fact that no fire exists on the top of an existing middle ring fire cover.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas -cooker technical field especially relates to a middle ring fire cover and burner thereof. BACKGROUND

[0002] The middle ring fire cover of one key explosive stir -fry fire burner is greater than 40mm in diameter at present, flame sprays from the side of the middle ring fire cover at a certain angle, and the high temperature area of the flame is within the range of the 80mm diameter of the bottom of the sharp -bottomed pot, which easily causes the temperature of the center of the pot bottom to be low, affecting the user experience. When the firepower of the middle ring fire increases by 10%, although the middle ring flame is lengthened, the flame change is not obvious, and the high temperature area of the sharp -bottomed pot will be further extended to the range of the 90mm diameter of the pot bottom, which is not conducive to the quick -stir frying demand of cooking. SUMMARY

[0003] The utility model aims at solving one of the problems existing in the prior art to at least some extent, and therefore provides a middle ring fire cover, which solves the phenomenon that the low temperature of the pot bottom caused by no fire on the top of the existing middle ring fire cover. The utility model further provides a burner.

[0004] According to the above-mentioned middle ring fire cover, the following technical scheme is adopted:

[0005] A middle ring fire cover comprises: a fire cover body provided with a middle ring gas chamber opening downward, a main fire hole group in communication with the middle ring gas chamber is arranged on the outer side wall of the fire cover body, an upper gas chamber opening upward is concavely arranged on the top of the fire cover body, a straight jet fire hole group in communication with the middle ring gas chamber is arranged on the bottom surface or the outer side cavity wall surface of the upper gas chamber; and a straight jet fire cover is installed on the top of the fire cover body and covers the upward opening of the upper gas chamber, a top fire hole group in communication with the upper gas chamber is arranged on the straight jet fire cover.

[0006] In some embodiments, the main fire hole group comprises an upper sub-fire hole group and / or a lower sub-fire hole group, the upper sub-fire hole group comprises a plurality of upper large fire holes and a plurality of upper small fire holes, the upper large fire holes and the upper small fire holes are arranged alternately in the circumferential direction, and the lower sub-fire hole group comprises a plurality of lower large fire holes arranged at intervals in the circumferential direction.

[0007] In some embodiments, the bottom surface of the upper gas chamber is a plane or an inner inclined surface, the inner inclined surface is arranged to be inclined from outside to inside and upward; and / or the outer side cavity wall surface of the upper gas chamber is an outer inclined surface, the outer inclined surface is arranged to be inclined from inside to outside and upward, and the straight jet fire hole group is arranged on the outer inclined surface.

[0008] In some embodiments, the fire cover body is further provided with a straight injection air chamber with openings at both upper and lower ends, which are located at the inner ring of the middle air chamber and the upper air chamber respectively; the straight injection fire cover covers the upward opening of the upper air chamber and the straight injection air chamber respectively, and the top fire hole group is in communication with the straight injection air chamber.

[0009] In some embodiments, a plurality of pressure relief holes are opened on the cavity wall of the straight injection air chamber in a circumferential interval, and the straight injection air chamber is in communication with the upper air chamber through the pressure relief holes.

[0010] In some embodiments, a liquid storage groove is recessed on the top of the fire cover body and located at the periphery of the straight injection fire cover, and a flow guide groove is opened on the radial outer side of the top of the fire cover body and in communication with the liquid storage groove.

[0011] In some embodiments, the liquid storage groove has oppositely arranged inner and outer groove walls, the outer groove wall is arranged in a curved manner from inside to outside and upward, and the inner groove wall is arranged in a slanted manner from outside to inside and upward.

[0012] In some embodiments, a brim extending outward is protruded on the top outer edge or outer side wall of the fire cover body, and a group of ignition holes is opened on the outer side wall of the fire cover body and located directly below the brim, and the group of ignition holes is in communication with the middle air chamber.

[0013] According to the above-mentioned burner, the following technical scheme is adopted:

[0014] The burner comprises a burner head structure provided with a middle mixing gas cavity with an upward opening, and a middle ring fire cover as described above, which is arranged on the top of the burner head structure and in communication with the middle mixing gas cavity.

[0015] In some embodiments, the burner head structure is further provided with a straight injection mixing gas cavity with an upward opening, which is arranged in the middle mixing gas cavity; and the middle ring fire cover is further provided with a straight injection air chamber, which is in communication with the straight injection mixing gas cavity and the top fire hole group of the straight injection fire cover respectively.

[0016] Compared with the prior art, the present utility model has at least the following beneficial effects:

[0017] 1. The middle ring fire cover of the present utility model is provided with a middle air chamber with a downward opening and an upper air chamber with an upward opening on the fire cover body, a main fire hole group in communication with the middle air chamber is opened on the outer side wall of the fire cover body, and a straight injection fire cover covering the upper air chamber is arranged on the top of the fire cover body, and the top fire hole group of the straight injection fire cover is in communication with the middle air chamber through the upper air chamber, so that the flame can be injected from the side and the top of the middle ring fire cover, and the phenomenon that the top of the existing middle ring fire cover has no fire and causes low temperature of the bottom of the pot is solved.

[0018] 2. By setting the direct injection gas chamber in the inner circle of the middle ring gas chamber on the fire cap body, the top fire hole group of the direct injection fire cap is respectively connected with the upper gas chamber and the direct injection gas chamber, so that a fire column can be added in the top center of the middle ring fire cap, the firepower is increased by about 10%, so that the central temperature of the pot bottom can be further improved, the cooking speed is accelerated, and the explicitness of the explosive frying fire is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is the explosion view of the middle ring fire cap in the embodiment of the utility model;

[0020] Figure 2 is the structure schematic view of the middle ring fire cap in the embodiment of the utility model;

[0021] Figure 3 is the sectional view of the middle ring fire cap in the embodiment of the utility model;

[0022] Figure 4 is the sectional view of the fire cap body in the embodiment of the utility model;

[0023] Figure 5 is the structure schematic view of the gas stove in the embodiment of the utility model;

[0024] Figure 6 is the explosion view of the burner in the embodiment of the utility model;

[0025] Figure 7 is the sectional view of the burner in the embodiment of the utility model Figure 1 .

[0026] Figure 8 is the sectional view of the burner in the embodiment of the utility model Figure 2 .

[0027] In the drawing: 1- burner structure, 11- burner body, 111- outer mixed gas cavity, 112- middle mixed gas cavity, 113- direct injection mixed gas cavity, 1131- gas connection channel, 12- outer injection pipe, 13- middle injection pipe, 14- direct injection injector;

[0028] 2- fire divider, 21- outer ring gas cavity, 211- gas inlet, 22- middle ring gas cavity, 23- direct injection gas cavity, 24- secondary air channel; 3- flow baffle, 31- air equalizing hole;

[0029] 4-outer ring fire cover, 41-outer ring air chamber, 411-outer ring fire hole; 5-fire cover body, 51-middle ring air chamber, 511-upper large fire hole, 512-upper small fire hole, 513-lower large fire hole, 514-ignition hole, 515-flame stabilizing ring, 52-upper air chamber, 521-straight injection fire hole, 53-straight injection air chamber, 531-pressure relief hole, 541-liquid storage tank, 542-flow guide groove, 55-hat brim; 6-straight injection fire cover, 61-top fire hole;

[0030] 7-stopcock valve, 712-outer ring gas outlet, 722-middle ring air channel, 723-frying gas channel, 74-solenoid valve, 751-outer ring air pipe, 752-middle ring air pipe, 753-frying gas pipe;

[0031] 8-ignition assembly. DETAILED DESCRIPTION

[0032] The following examples are used to illustrate the present application, but the present application is not limited by these examples. Modifications to the specific embodiments of the present application or equivalent replacements to some technical features are made without departing from the spirit of the present application, and they should be included in the technical solution range of the present application.

[0033] Example 1

[0034] Reference Figures 1-4 The present embodiment provides a middle ring fire cover, which comprises a fire cover body 5 and a straight injection fire cover 6. The fire cover body 5 is provided with a middle ring air chamber 51 which is open downward, and a main fire hole group is arranged on the outer side wall of the fire cover body 5 and communicates with the middle ring air chamber 51. An upper air chamber 52 is concavely arranged on the top of the fire cover body 5 and is open upward, and a straight injection fire hole group is arranged on the bottom surface or the outer side cavity wall surface of the upper air chamber 52 and communicates with the middle ring air chamber 51. In the present embodiment, the straight injection fire hole group comprises a plurality of straight injection fire holes 521 which are arranged in a circumferential direction and are spaced apart from each other. The straight injection fire cover 6 is installed on the top of the fire cover body 5 and covers the upward opening of the upper air chamber 52, and a top fire hole group is arranged on the top of the straight injection fire cover 6. In the present embodiment, the straight injection fire cover 6 is any one of a ceramic hole plate, a honeycomb plate or a metal mesh plate, and the straight injection fire cover 6 is riveted or welded and fixed on the top of the fire cover body 5. The top fire hole group comprises a plurality of top fire holes 61 which are uniformly arranged on the straight injection fire cover 6. Since the porosity of the straight injection fire cover 6 is large, the stability of combustion is improved.

[0035] The middle ring gas flows into the middle ring gas chamber 51 and is divided into two paths. One path (most of the gas) directly flows out from the main fire hole group and is ignited to form a middle ring side fire. The other path (a small part of the gas) flows through the direct injection fire hole group and the upper gas chamber 52 in turn, and finally flows out from the top fire hole group and is ignited to form a middle ring top fire. In this way, the flame can be ejected from the side and top of the middle ring fire cover, increasing the range and uniformity of the middle ring fire, and solving the problem of low bottom temperature caused by the absence of fire on the top of the existing middle ring fire cover.

[0036] Reference Figures 1-4 The main fire hole group includes an upper sub-fire hole group and / or a lower sub-fire hole group. The upper sub-fire hole group includes a plurality of upper large fire holes 511 and a plurality of upper small fire holes 512, and the upper large fire holes 511 and the upper small fire holes 512 are arranged alternately in the circumferential direction. The lower sub-fire hole group includes a plurality of lower large fire holes 513 arranged at intervals in the circumferential direction, and the lower large fire holes 513 are arranged below the adjacent two upper large fire holes 511 and directly below the adjacent upper small fire holes 512, so that the flame at the rear of the lower large fire hole is staggered with the flame at the upper large fire hole, reducing the interference between the flames. In this way, under the joint action of the upper sub-fire hole group and the lower sub-fire hole group, the flame stability of the middle ring fire is improved. In addition, a flame stabilizing ring 515 is arranged on the outer side wall of the fire cover body 5, and the flame stabilizing ring 515 is located below the main fire hole group and communicates with the middle ring gas chamber 51.

[0037] Reference Figures 1-4 The upper gas chamber 52 has an expanding structure, so that the caliber of the upper gas chamber 52 gradually increases from bottom to top. The bottom surface of the upper gas chamber 52 is a plane or an inner inclined surface, which is arranged to be inclined upward from outside to inside in the radial direction; and / or the outer side cavity wall surface of the upper gas chamber 52 is an outer inclined surface, which is arranged to be inclined upward from inside to outside in the radial direction, and the direct injection fire hole group is arranged on the outer inclined surface, so that the gas outlet direction of the direct injection fire hole group is directed to the center of the pot bottom. In this embodiment, the bottom surface of the upper gas chamber 52 is an inner inclined surface, and the outer side cavity wall surface of the upper gas chamber 52 is an outer inclined surface, which is arranged at an obtuse angle with the inner inclined surface, as shown in Figure 3 .

[0038] Reference Figures 1-4 Further, the fire cover body 5 is also provided with a direct injection gas chamber 53 with openings at the upper and lower ends, and the direct injection gas chamber 53 is located in the inner circle of the middle ring gas chamber 51 and the upper gas chamber 52 respectively. The direct injection fire cover 6 abuts against the upper end surface of the direct injection gas chamber 53, and covers the upward opening of the upper gas chamber 52 and the upward opening of the direct injection gas chamber 53 respectively, and the top fire hole group communicates with the upper gas chamber 52 and the direct injection gas chamber 53 respectively. In this way, when the gas stove starts the explosive stir-frying fire, an additional flame column can be added at the center of the top of the middle ring fire cover, so that the firepower increases by about 10%, effectively improves the center temperature of the pot bottom, speeds up the cooking speed, and meets the user's demand for explosive stir-frying, while effectively improving the explicitness of the explosive stir-frying fire or the direct injection fire.

[0039] A plurality of pressure relief holes 531 are formed on the upper end of the cavity wall of the direct injection air chamber 53, and the direct injection air chamber 53 is in communication with the upper air chamber 52 through the pressure relief holes 531. In this way, when the gas stove is not started for stir-frying, the top of the middle ring fire cover can form a ring-shaped dense small fire. When the top fire hole directly above the direct injection air chamber 53 is blocked, the gas in the direct injection air chamber 53 can flow to the upper air chamber 52, preventing the gas from flowing back to the inside of the gas stove when the center direct injection fire is blocked, which can cause danger.

[0040] Reference Figures 1-4 Further, a liquid storage groove 541 is recessed on the top of the fire cover body 5 and opens upward, and the liquid storage groove 541 is located at the periphery of the direct injection fire cover 6 and is used to collect the liquid of the overflowing pot. A flow guide groove 542 is formed on the radial outer side of the top of the fire cover body 5 and is in communication with the liquid storage groove 541, and is used to timely drain the liquid in the liquid storage groove 541. In this way, under the cooperation of the liquid storage groove 541 and the flow guide groove 542, the liquid of the overflowing pot can be prevented from flowing into the direct injection fire cover 6 and / or the main fire hole group, blocking the fire hole and causing the phenomenon of poor flame.

[0041] The liquid storage groove 541 has an expanding structure, so that the caliber of the outlet of the liquid storage groove gradually increases from bottom to top. The liquid storage groove 541 has oppositely arranged inner and outer groove walls. The outer groove wall is curved and arranged from inside to outside and upward along the radial direction. The inner groove wall is inclined and arranged from outside to inside and upward along the radial direction. In this way, the liquid of the overflowing pot can be quickly drained to the inside of the liquid storage groove, effectively preventing the liquid of the overflowing pot from flowing into the direct injection fire cover 6 and / or the main fire hole group and blocking the fire hole.

[0042] Reference Figures 1-4 Further, a brim 55 extending outward is protruded on the top outer edge or the upper end of the outer side wall of the fire cover body 5, and the brim 55 is oppositely arranged with the flow guide groove 542. A ignition hole group is formed on the outer side wall of the fire cover body 5 and is located directly below the brim 55, and the ignition hole group is in communication with the middle ring air chamber 51. In this embodiment, the ignition hole group is composed of a plurality of ignition holes 514. In this way, the head of the ignition hole group and the ignition assembly can be reliably protected. Not only can the liquid of the overflowing pot be prevented from dripping into the ignition hole group and blocking the fire hole, but also the liquid of the overflowing pot can be prevented from dripping into the head of the ignition assembly, thereby causing the phenomenon of poor ignition.

[0043] Embodiment 2

[0044] Reference Figures 5-8The burner of the embodiment comprises a burner head structure 1, an outer ring fire cover 4 and a middle ring fire cover as described in the embodiment 1. The burner head structure 1 comprises a burner head body 11, an injection assembly and a direct injection ejector 14. The burner head body 11 is provided with an upwardly open outer mixing chamber 111, an upwardly open middle mixing chamber 112, an upwardly open direct injection mixing chamber 113 and a transversely arranged air receiving passage 1131. The outer mixing chamber 111 is arranged outside the middle mixing chamber 112 and is arranged in the same direction and side by side with the middle mixing chamber 112, so that the outer mixing chamber 111 is arranged eccentrically. Compared with the annular outer mixing chamber of the existing burner head, the overall size of the burner head structure in the radial direction is smaller, and the outer mixing chamber 111 does not have the resistance loss caused by the turning flow passage, which is beneficial to the primary air coefficient of the outer ring fire and improves the mixing effect of the outer ring gas and air.

[0045] The direct injection mixing chamber 113 is arranged inside the middle mixing chamber 112. One end of the air receiving passage 1131 extends to the outside of the lateral wall of the burner head body 11, and the other end extends into the middle mixing chamber 112 and communicates with the direct injection mixing chamber 113. When the direct injection mixed gas flows out of the direct injection mixing chamber 113 upwardly and ignites on the middle ring fire cover of the burner, a direct injection fire or a stir-frying fire is formed, an additional fire column is realized, the firepower is increased by about 10%, so that the central temperature of the pot bottom can be further improved, the speed of frying is accelerated, and the explicitness of the stir-frying fire is effectively improved. The injection assembly is detachably mounted on the burner head body 11, and the injection assembly comprises the outer injection pipe 12 and the middle injection pipe 13 arranged in the same direction and side by side. The outer injection pipe 12 communicates with the outer mixing chamber 111, and the middle injection pipe 13 communicates with the middle mixing chamber 112. The direct injection ejector 14 is detachably mounted on the air inlet end of the air receiving passage 1131, so that the primary air injection of the direct injection fire is independent of the middle ring fire, which is beneficial to improving the stability of the direct injection fire.

[0046] Reference Figures 5-7 The outer ring fire cover 4 is arranged on the top of the outer mixing chamber 111. Specifically, the outer fire cover 4 is provided with a downwardly open outer ring air chamber 41. A plurality of outer ring fire holes 411 are arranged on the lateral wall or the top of the outer fire cover 4. The outer ring fire holes 411 communicate with the outer mixing chamber 111 through the outer ring air chamber 41. The middle ring fire cover is arranged on the top of the burner head structure 1. The middle ring air chamber 51 of the middle ring fire cover communicates with the middle mixing chamber 112 of the burner head structure 1. The direct injection air chamber 53 of the middle ring fire cover respectively communicates with the direct injection mixing chamber 113 of the burner head structure 1 and the top fire hole group of the direct injection fire cover 6.

[0047] When the outer ring gas flows out of the outer ring gas outlet 712 of the plug valve 7, it passes through the outer ring air pipe 751, the outer injection pipe 12 of the burner head structure 1 and the outer mixing chamber 111, and finally flows out of the outer fire cover 4 and is ignited to form the outer ring fire, as shown in Figure 5 and Figure 7 .

[0048] When the middle ring gas flows out from the gas supply channel of the plug valve 7, it is divided into two parts, one of which passes through the middle ring gas channel 722, the middle ring gas pipe 752, the middle injection pipe 13 of the burner structure 1 and the middle mixing chamber 112 in sequence, enters the middle ring fire cover, and is divided into two paths, one of which directly flows out from the main fire hole group and is ignited to form the middle ring side fire, and the other of which flows through the direct injection fire hole group and the upper gas chamber 52 in sequence, and finally flows out upward from the top fire hole group and is ignited to form the middle ring top fire, see Figure 5 and Figure 7 ; the other part passes through the stir-frying gas channel 723, the stir-frying gas pipe 753, the direct injection ejector 14 and the direct injection mixing chamber 113 of the burner structure 1, the direct injection gas chamber 53 of the middle ring fire cover in sequence, and finally flows out directly upward from the direct injection fire cover 6 of the middle ring fire cover and is ignited to form the direct injection fire, i.e. the stir-frying fire, see Figure 5 and Figure 8 An electromagnetic valve 74 is arranged on the stir-frying gas channel 723 of the plug valve 7, which is used to control the on-off of the stir-frying gas channel 723.

[0049] It can be seen that when the gas stove starts the one-key stir-frying fire, an additional fire column is added at the top center of the middle ring fire cover of the burner to increase the firepower by about 10%, so as to further improve the center temperature of the pot bottom and speed up the cooking speed, and at the same time, the explicitness and stability of the stir-frying fire are improved. In addition, when the one-key stir-frying fire of the gas stove is not started, the middle ring side fire and the middle ring top fire can also be formed on the middle ring fire cover, which improves the force range and uniformity of the middle ring fire, and effectively solves the phenomenon that the top of the middle ring fire cover is without fire, resulting in low temperature of the pot bottom, under the condition that the central stir-frying fire of the burner or the gas stove is not started.

[0050] Example 3

[0051] Reference Figures 5-8The difference between the embodiment and the embodiment 2 is that the burner further comprises a burner distributor 3 arranged between the burner head structure 1 and the fire cap structure. The burner distributor 2 is provided with coaxially arranged outer ring air cavity 21, middle ring air cavity 22 and straight injection air cavity 23, the middle ring air cavity 22 is arranged between the outer ring air cavity 21 and the straight injection air cavity 23, the outer ring air cavity 21 is provided with a gas inlet 211 at the bottom of the cavity corresponding to the position of the outer mixed gas cavity 111, the outer ring air cavity 21 is connected with the outer mixed gas cavity 111 through the gas inlet 211, the middle ring air cavity 22 is connected with the middle mixed gas cavity 112, and the straight injection air cavity 23 is connected with the straight injection mixed gas cavity 113. The outer ring air chamber 41 of the outer ring fire cap 4 is connected with the upper end of the outer ring air cavity 21, the middle ring fire cap is connected with the middle ring air cavity 22 and the straight injection air cavity 23, that is, the middle ring air chamber 51 of the middle ring fire cap is connected with the upper end of the middle ring air cavity 22, and the straight injection air chamber 52 of the middle ring fire cap is connected with the upper end of the straight injection air cavity 23. In addition, the burner distributor 2 is further provided with a secondary air channel 24 arranged between the middle ring air cavity 22 and the outer ring air cavity 21, which is used for providing the middle ring fire with the secondary air required for combustion.

[0052] Reference Figures 6-7 Further, the gas stove further comprises a baffle 3 arranged above the gas inlet 211 and connected with the burner distributor 2 or the outer ring fire cap 4, and a plurality of air equalizing holes 31 are arranged on the baffle 3, so as to improve the phenomenon of uneven flame caused by too fast local flow rate when the outer ring gas is injected from the side of the burner distributor.

[0053] The above only describes some embodiments of the present application. For those skilled in the art, without departing from the creative concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application.

Claims

1. A center-pivot fire lid, characterized by, Comprise: A fire cap body (5) provided with a downwardly open middle ring air chamber (51), a main fire hole group communicated with the middle ring air chamber (51) is arranged on the outer wall of the fire cap body (5), an upwardly open upper air chamber (52) is arranged on the top of the fire cap body (5), a straight jet fire hole group communicated with the middle ring air chamber (51) is arranged on the bottom surface or the outer side cavity wall surface of the upper air chamber (52); and A straight jet fire cap (6) installed on the top of the fire cap body (5) and covering the upwardly open upper air chamber (52), a top fire hole group communicated with the upper air chamber (52) is arranged on the straight jet fire cap (6).

2. A center-pivot fire lid as defined in claim 1, wherein The main fire hole group comprises an upper sub fire hole group and / or a lower sub fire hole group, the upper sub fire hole group comprises a plurality of upper large fire holes (511) and a plurality of upper small fire holes (512), the upper large fire holes (511) and the upper small fire holes (512) are arranged alternately along the circumferential direction, and the lower sub fire hole group comprises a plurality of lower large fire holes (513) arranged at intervals along the circumferential direction.

3. A center-pivot fire lid as defined in claim 1, wherein: The bottom surface of the upper air chamber (52) is a plane or an inner inclined surface, the inner inclined surface is arranged from outside to inside and upwardly inclined; and / or the outer side cavity wall surface of the upper air chamber (52) is an outer inclined surface, the outer inclined surface is arranged from inside to outside and upwardly inclined, and the straight jet fire hole group is arranged on the outer inclined surface.

4. A center-pivot fire lid as defined in claim 1, wherein: The fire cap body (5) is further provided with a straight jet air chamber (53) with upper and lower openings, the straight jet air chamber (53) is respectively located in the inner ring of the middle ring air chamber (51) and the upper air chamber (52); the straight jet fire cap (6) covers the upwardly open upper air chamber (52) and the straight jet air chamber (53) respectively, and the top fire hole group is communicated with the straight jet air chamber (53).

5. A center-pivot fire lid as defined in claim 4 wherein, A plurality of pressure relief holes (531) are arranged at intervals in the circumferential direction on the cavity wall upper end of the straight jet air chamber (53), and the straight jet air chamber (53) is communicated with the upper air chamber (52) through the pressure relief holes (531).

6. A center-pivot fire lid as defined in any one of claims 1-5, characterized in that A liquid storage groove (541) is arranged on the top of the fire cap body (5) and located in the periphery of the straight jet fire cap (6), and a flow guide groove (542) communicated with the liquid storage groove (541) is arranged on the radial outer side of the top of the fire cap body (5).

7. A center-pivot fire lid as defined in claim 6 wherein, The liquid storage groove (541) has oppositely arranged inner groove walls and outer groove walls, the outer groove walls are arranged from inside to outside and upwardly curved, and the inner groove walls are arranged from outside to inside and upwardly inclined.

8. A center-pivot fire lid as defined in any one of claims 1-5, characterized in that A hat brim (55) extending outwardly is arranged on the top outer edge or the outer wall upper end of the fire cap body (5), and an ignition hole group is arranged on the outer wall of the fire cap body (5) and located directly below the hat brim (55), the ignition hole group is communicated with the middle ring air chamber (51).

9. A burner characterized by, Comprise: A burner structure (1) provided with an upwardly open middle mixed gas cavity (112); and A middle ring fire cap as claimed in any one of claims 1-8, the middle ring fire cap is arranged on the top of the burner structure (1), and the middle ring air chamber (51) is communicated with the middle mixed gas cavity (112). ​ 10. A burner as claimed in claim 9, characterised in that The furnace head structure (1) is further provided with a straight injection mixing cavity (113) opening upward, which is arranged in the middle mixing cavity (112); the middle ring flame cover is further provided with a straight injection gas chamber (53) in communication with the straight injection mixing cavity (113) and the top group of flame holes of the straight injection flame cover (6) respectively.

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