CN211600793U - A constant fire device and its gas stove - Google Patents

Abstract

A normally open fire device comprises a housing, a supporting plate, a first air supply pipe, a second air supply pipe and a pair of ignition components; the bottom end of the housing is open, a spray pipe is communicated with the side wall of the housing, each ignition assembly is provided with a guide pipe, the upper ends of the first air supply pipe, the second air supply pipe and the guide pipes of the pair of ignition assemblies are hermetically connected to the hole wall of the corresponding through hole of the support plate, the housing covers the support plate, and the ignition needles of the pair of ignition assemblies are positioned in the housing. The flame of the normal open fire generated by the device is stable, the concentration ratio is high, the device is powerful and powerful, the main combustion gas can be ignited at any time, main combustion is formed, and no carbon monoxide is generated. The utility model also discloses a gas kitchen range with the device.

Description

A constant fire device and its gas stove

technical field

The utility model relates to a stove, in particular to a constant open fire device and a gas stove thereof.

Background technique

A gas stove currently in use is shown in Figures 1 to 7 .

Referring to FIGS. 1 and 2 , the gas cooktop 1000 has a cooktop 400 , a combustible gas main burner 500 and a constant-fire unit 600 .

Referring to FIGS. 1 and 2 , the cooktop 400 has an inner heat absorption tank 410 in the furnace, an outer heat absorption tank 420 in the furnace, and an outer lateral heat absorption tank 430 . The outer lateral water absorption tank 430 has an inner rectangular cylinder 431 and an outer rectangular cylinder 432, and the space between the outer surface of the inner rectangular cylinder 431 and the inner surface of the outer rectangular cylinder 432 is for the outer transverse absorption tank 430 to contain water. Space. The bottom of the hot water absorption tank 410 in the inner ring of the furnace is in communication with the bottom of the hot water absorption tank 420 in the outer ring of the furnace. The outer ring absorbing water tank 420 of the furnace is in communication with the outer lateral absorbing water tank 430 for accommodating water. A short pipe 480 communicates the head space of the heat absorption tank 410 in the inner ring of the furnace with the head space of the heat absorption tank 420 in the outer ring of the furnace. The space between the outer wall plate of the hot water absorption tank 410 in the inner ring of the furnace and the inner wall plate of the hot water absorption tank 20 in the outer ring of the furnace is the inner annular flue gas channel 421 of the stove body 400 . The inner rectangular cylinder 431 is the transverse flue gas passage of the cooktop 400 . The inner annular flue gas channel 421 communicates with the space enclosed by the inner rectangular cylindrical body 431 as a transverse flue gas channel. The top wall plate of the hot water absorption tank 410 in the inner ring of the furnace extends outward, and is sealed and welded with the inner cylindrical wall plate of the hot water absorption tank 420 in the outer ring of the furnace to form an annular top plate 413, which closes the upper part of the internal flue gas channel 121. A plurality of through holes are opened on the top plate 413, or four through holes 414 are opened on the annular top plate 413 away from the external lateral water absorption tank 430, so that the inner cylindrical wall plate of the furnace outer ring absorption water tank 420 is located above the annular top plate 413. The upper furnace chamber 411 formed by the partially enclosed space communicates with the inner annular flue gas channel 421 . A plurality of communication pipes 434 are sealed and welded between the top wall plate and the bottom wall plate of the inner rectangular cylindrical body 431 of the outer lateral water absorption tank 430, The top space outside the body 431 is communicated with the bottom space, which can improve the heating effect of the high temperature gas generated by the combustion flowing through the external lateral flue gas channel to the water in the external lateral hot water absorption tank 430 .

The cooktop 400 also has an inner horizontal water absorption tank 450, which has a top wall 451 and a bottom wall 452. The inner transverse water absorption tank 450 communicates with the inner ring of the furnace 410. The lower furnace chamber 412 is formed by the space surrounded by the portion of the inner cylindrical wall plate of the heat absorption tank 410 in the inner ring of the furnace which is located above the top wall plate 451 of the inner lateral heat absorption tank 450 . The upper furnace chamber 411 communicates with the lower furnace chamber 412 .

The lower end of a smoke exhaust pipe 433 is sealed and welded with an opening on the top wall of the inner rectangular cylinder 431 , and the other end protrudes upward from an opening on the top wall of the outer rectangular cylinder 432 and is sealed and welded with the opening. .

Referring to FIGS. 3 to 7 , the main combustible gas burner 500 has a lower gas mixing casing 510 , an intermediate support 520 , an upper air jet head 530 and a plurality of air-fuel mixture conduits 550 .

There is a partition 513 in the middle of the gas mixing shell 510 to separate the gas mixing shell 510 into a lower shell part 511 and an upper shell part 512 . The lower end of the lower housing part 511 has a lower closing plate 514 . The upper housing part 512 has an upper closing plate 519 at the upper end. A plurality of air guide pipes 515 are sealed and welded at the plurality of through holes on the lower closing plate 514 , which are inclined upward from the inside to the outside and from the left to the right, and the centers of the plurality of through holes are on the same circular line. A central through hole 516 is formed in the partition plate 513 . There is an air intake stub 517 below the lower closing plate 514 of the lower housing portion 511. A gas inlet stub 518 is formed on the circumferential wall of the lower housing portion 511.

The intermediate support 520 is in the shape of a stepped groove, and has a bottom wall plate 521 , a lower peripheral wall plate 522 , a middle annular supporting wall plate 523 and an upper peripheral wall plate 524 . The upper end of the lower peripheral wall plate 522 is slightly higher than the upper surface of the middle annular support wall plate 523 .

The upper air blowing head 530 has an annular closing plate 531 , a substantially conical guide sleeve 532 and a cylindrical air blowing sleeve 533 . A plurality of small circular through holes 534 are opened in the upper part of the cylindrical air jet sleeve 533 . A plurality of vertical narrow openings 535 are opened in the middle and lower part of the cylindrical air jet sleeve 533 .

Referring to FIGS. 8 to 13 , the always-open flame unit 600 has a wind shield 601 , an air supply pipe 602 and a pair of ignition assemblies 603 . As shown in FIGS. 9 and 12 , the left part of the windshield 601 is rectangular, and the right part is semicircular. As shown in FIG. 10 and FIG. 11 , the wind shield 601 is a casing whose left end is open. As shown in FIG. 10 and FIG. 11 , the top of the air supply pipe 602 is closed, and a through hole 604 is formed on the side wall of the top. As shown in FIG. 11 , each ignition assembly 603 has a metal conduit 605 , a high temperature resistant ceramic sleeve 606 and a high temperature resistant metal needle 607 . The high temperature resistant ceramic sleeve 606 is inserted into the metal guide tube 605 from the top of the metal guide tube 605 , and the top is exposed outside the top of the high temperature resistant ceramic sleeve 606 . The high temperature resistant metal needle 607 is located in the center hole of the high temperature resistant ceramic sleeve 606, the upper part of which is bent and extended out of the gap at the top of the high temperature resistant ceramic sleeve 606, and the lower part is connected to the wire, and the wire (not shown) is connected to the electric control switch (not shown) connected. As shown in FIGS. 10 and 11 , the gas supply pipe 602 and the metal conduits 605 of the two ignition assemblies 603 pass through the bottom plate of the draft shield 601 in a sealed manner, and their upper ends are located in the draft shield 601 casing. As shown in FIGS. 12 and 13 , the gas supply pipe 602 is located on the right side of the two ignition assemblies 603 , and the center of the air supply pipe 602 is located on the symmetrical centerline of the two ignition assemblies 603 .

Referring to FIGS. 1 and 2 , the annular supporting wall plate 523 in the middle of the intermediate support 520 of the combustible gas main burner 500 and the upper closing plate 519 at the upper end of the upper casing part 512 are sealed and welded to the inner transverse direction of the cooktop 400 respectively. The combustible gas main burner 500 is fixedly installed in the cooktop 400 on the hole wall of the central hole of the top wall plate 451 and the hole wall of the central hole of the bottom wall plate 452 of the hot water absorption tank 450 . The gas supply pipe 602 of the always-open flame unit 600 and the two metal conduits 605 of the pair of ignition assemblies 603 are sealed and welded to the hole wall and bottom of the corresponding hole of the top wall plate 451 of the inner lateral water absorption tank 450 of the cooker body 400 respectively. On the hole wall of the corresponding hole of the wall plate 452 , the constant open flame unit 600 is fixedly installed in the cooktop 400 . The always-open fire unit 600 is located at the periphery of the main combustible gas burner 500 , and the lower surface of the bottom plate of the casing of the draft shield 601 of the always-open fire unit 600 is slightly higher than the annular closing plate 531 of the upper air jet head 530 of the main combustible gas burner 500 the upper surface.

The operation process of the gas stove 1000 will be described in detail below with reference to the accompanying drawings:

Referring to FIG. 1, the combustible gas is delivered to the air supply pipe 602, and the combustible gas flows out from the through hole 604 on the top side wall of the air supply pipe 602, enters the casing of the draft shield 601, and mixes with the air in the casing of the draft shield 601; the manual electric control switch, High voltage is applied to the two high temperature-resistant metal needles 607 of the two ignition assemblies 603 to generate electric sparks, and the mixed gas of air and combustible gas in the casing of the windshield 601 is ignited to form a constant flame, and the constant flame is emitted from the casing of the windshield 601. The opening at the left end of the body burns toward the center of the main combustible gas burner 500; at the same time, the air is delivered to the air inlet short pipe 517 and the combustible gas is delivered to the gas inlet short pipe 518, and the air and the combustible gas are mixed in the lower casing part 511 to form the main combustion Then the main combustion gas enters the upper casing part 512 through the central through hole 516 on the partition plate 513, and then enters the space between the conical guide sleeve 532 and the cylindrical jet sleeve 533 through a plurality of air-fuel mixture conduits 550. space, and then enter the space surrounded by the cylindrical jet jacket 533 through a plurality of small circular through holes 534 and a plurality of vertical narrow openings 535 on the cylindrical jet jacket 533, and the main combustion gas rises and is ignited by a constant flame to form main burn. A pot (not shown) is supported on top of the outer ring of the furnace 420 to substantially seal the space of the upper furnace 411. On the one hand, the high-temperature flue gas generated by the main combustion can be used to heat the pot for cooking, and on the other hand, in the case where the pot basically seals the space of the upper furnace chamber 411, the high-temperature smoke fills the space of the upper furnace chamber 411 and The space in the lower furnace chamber 412 heats the water in the inner ring water absorption tank 410 of the furnace, the outer ring water absorption tank 420 of the furnace and the water in the inner horizontal water absorption tank 450, and then the high temperature flue gas enters the inner annular flue gas channel through the four through holes 414 421, and then enter the space surrounded by the inner rectangular cylinder 431 as the transverse flue gas channel, heat the water in the outer transverse heat absorption tank 430, and finally discharge it to the outside of the stove 400 through the exhaust pipe 433.

In the case of the constant open flame unit 600 used in the gas stove 1000, when the amount of combustible gas delivered to the gas supply pipe 602 is unstable, especially when the amount of combustible gas exceeds a reasonable amount, the combustible gas is not sufficiently burned, and carbon monoxide is produced. It is discharged into the environment, which is harmful to health. The flame of the ever-open fire is sometimes strong and sometimes weak, which affects the ignition of the main combustion at any time; the ever-open flame unit 600 used in the gas stove 1000, the left end of the windshield 601 shell is open, and the ever-open flame is opened from the windshield. When the opening at the left end of the casing 601 burns toward the center of the main combustible gas burner 500, it is easily affected by the external air flow, and the flame of the normally open flame is not concentrated, scattered and gathered from time to time, which affects the ignition of the main combustion at any time.

Utility model content

The utility model aims to solve the technical problems that the combustible gas of the currently used normally open fire unit used for gas stoves is insufficiently burned, and the generated carbon monoxide is harmful to health and the flame of the normally open fire is unstable, which affects the ignition of the main combustion at any time. Open flame installations and their gas stoves.

The constant open flame device of the utility model is characterized in that it comprises a cover, a support plate, a first gas supply pipe, a second gas supply pipe and a pair of ignition components; the bottom end of the cover is open, and the side of the cover is open. A nozzle is communicated with the wall, and each ignition assembly has a conduit, and the upper ends of the first air supply pipe, the second air supply pipe and the conduits of the pair of ignition assemblies are sealingly connected to the corresponding through holes of the support plate. On the hole wall, the cover is covered on the support plate, and the spark pins of the pair of spark assemblies are located in the cover.

In the constant open flame device of the present invention, since the casing and the support plate jointly define a substantially closed space, the mixed gas of air and combustible gas transported through the first air supply pipe burns in it, and is not affected by any external environment. The flame of the open flame is stable; due to the supplementary air to the basically closed space through the second air supply pipe, the combustible gas in the open flame is re-burned, and the production of carbon monoxide is completely eliminated; The main burner, the constant open flame sprayed into the main burner has a high concentration and is strong and powerful, and can ignite the main combustion gas at any time to form the main combustion.

The gas stove of the utility model has a main burner and a constant open flame device, which is characterized in that the constant open flame device comprises a cover, a support plate, a first air supply pipe, a second air supply pipe and a pair of heaters. Fire assembly; the bottom end of the casing is open, a nozzle is communicated on the side wall, each ignition assembly has a conduit, the first air supply pipe, the second air supply pipe and the conduits of the pair of ignition assemblies The upper end of the fuse is sealingly connected to the hole wall of the corresponding through hole of the support plate, the cover is covered on the support plate, the spark needles of the pair of ignition assemblies are located in the cover, and the normally open flame device is arranged in the cover The periphery of the main burner.

The gas stove of the utility model has a main burner and a constant open flame device, which is characterized in that the constant open flame device comprises a cover, a support plate, a first air supply pipe, a second air supply pipe and a pair of heaters. Fire assembly; the bottom end of the casing is open, a nozzle is communicated on the side wall, each ignition assembly has a conduit, the first air supply pipe, the second air supply pipe and the conduits of the pair of ignition assemblies The upper end of the fuse is sealingly connected to the hole wall of the corresponding through hole of the support plate, the cover is covered on the support plate, the spark needles of the pair of ignition assemblies are located in the cover, and the normally open flame device is arranged in the cover The periphery of the main burner; also has an auxiliary burner, the auxiliary burner has a combustion head and an air supply pipe, the combustion head has a central blind hole and a plurality of radial through holes, the plurality of radial through holes and the The central blind hole is communicated, and the upper end of the air supply pipe extends into the central blind hole; the auxiliary burner is arranged in the main burner.

Description of drawings

Fig. 1 is a kind of longitudinal sectional schematic diagram of existing gas stove;

Fig. 2 is the top view schematic diagram of the gas stove shown in Fig. 1;

Fig. 3 is the longitudinal sectional schematic diagram of the combustible gas main burner in the gas stove shown in Fig. 1;

Fig. 4 is the cross-sectional schematic diagram of the J-J line in Fig. 3;

Fig. 5 is the cross-sectional schematic diagram of the K-K line in Fig. 3;

Fig. 6 is the cross-sectional schematic diagram of the L-L line in Fig. 3;

Fig. 7 is the cross-sectional schematic diagram of the M-M line in Fig. 3;

8 is a schematic front view of the always-open fire unit in the gas stove shown in FIG. 1;

Fig. 9 is the top view schematic diagram of the always open flame unit shown in Fig. 8;

Fig. 10 is a cross-sectional schematic diagram of line A-A in Fig. 9;

FIG. 11 is a schematic cross-sectional view along the line B-B in FIG. 9;

Figure 12 is a schematic cross-sectional view through line C-C in Figure 10;

FIG. 13 is a schematic cross-sectional view through line D-D in FIG. 10;

14 is a schematic front view of the ever-open flame device of the present invention;

Figure 15 is a schematic top view of the always open flame device shown in Figure 14;

FIG. 16 is a schematic cross-sectional view through line E-E in FIG. 15;

Figure 17 is a schematic cross-sectional view taken along line F-F in Figure 15;

FIG. 18 is a schematic cross-sectional view through line G-G in FIG. 16;

FIG. 19 is a schematic cross-sectional view through line H-H in FIG. 16;

Figure 20 is a schematic longitudinal section of the combustible gas auxiliary burner of the present invention;

Figure 21 is a schematic longitudinal cross-sectional view of a gas stove with the always-open fire device of the present invention shown in Figure 14;

Fig. 22 is a schematic longitudinal cross-sectional view of a gas stove having the always-open flame device of the present invention shown in Fig. 14 and the combustible gas auxiliary burner of the present invention shown in Fig. 20 .

Detailed ways

The specific embodiments of the ever-open fire device and the gas stove thereof of the present invention will be further described below with reference to the accompanying drawings, and the features and advantages of the ever-open fire device and the gas stove thereof of the present invention will become more obvious.

As shown in FIG. 14 to FIG. 19 , the constant open flame device 100 of the present invention has a cylindrical casing 101 , a circular support plate 130 , a first gas supply pipe 102 , a second gas supply pipe 120 and a pair of ignition Component 103 . As shown in FIG. 15 and FIG. 16 , the bottom end of the cylindrical casing 101 is open, and a radial nozzle 110 is communicated with the cylindrical wall. As shown in FIGS. 17 to 19 , each ignition assembly 103 has a metal conduit 105 , a high temperature resistant ceramic sleeve 106 and a high temperature resistant metal needle 107 . The high temperature resistant ceramic sleeve 106 is inserted into the metal guide tube 105 from the top of the metal guide tube 105, and the top is exposed outside the top of the high temperature resistant ceramic sleeve 106. The high temperature resistant metal needle 107 is located in the central hole of the high temperature resistant ceramic sleeve 106, the upper part of which is bent and extended to the outside of the gap at the top of the high temperature resistant ceramic sleeve 106, and the lower part is connected to the wire (not shown), and the wire is connected to the electric control switch (not shown) connected. As shown in FIGS. 16 and 17 , the upper ends of the first gas supply pipe 102 , the second gas supply pipe 120 and the metal conduits 105 of the two ignition assemblies 103 are sealingly welded to the hole walls of the corresponding through holes of the circular support plate 130 . As shown in FIGS. 18 and 19 , the first gas supply pipe 102 and the second gas supply pipe 120 are located on the left and right sides of the two ignition assemblies 103 respectively, and the centers of the first gas supply pipe 102 and the second gas supply pipe 120 are located on the two dozen On the centerline of symmetry of the fire assembly 103 . The cylindrical casing 101 is placed on the circular support plate 130 .

As shown in FIG. 20 , the combustible gas auxiliary burner 200 of the present invention has a cylindrical combustion head 201 and an L-shaped gas supply pipe 202 . The cylindrical combustion head 201 has a central blind hole 204 and a plurality of radial through holes 205 , and the plurality of radial through holes 205 communicate with the central blind hole 204 . The upper end of the L-shaped gas supply pipe 202 can extend into the central blind hole 204 of the cylindrical combustion head 201 .

Referring to FIG. 21 , the always-open fire unit 600 shown in FIG. 8 in the existing gas stove 1000 shown in FIG. 1 is replaced by the always-open fire device 100 of the present invention shown in FIG. 14 , and the utility model shown in FIG. 21 is obtained The new gas stove 2000.

In the gas stove 2000 of the present invention shown in FIG. 21 , the first gas supply pipe 102 , the second gas supply pipe 120 and the two metal conduits 105 of the two ignition assemblies 103 of the constant fire device 100 are sealed and welded to the stove body 400 , respectively. On the hole walls of the corresponding holes of the top wall plate 451 and the hole walls of the corresponding holes of the bottom wall plate 452 of the inner lateral hot water absorption tank 450 , the constant fire device 100 is fixedly installed in the cooktop 400 . The normally open flame device 100 is located at the periphery of the combustible gas main burner 500, and the nozzle 110 of the normally open flame device 100 extends into a radial through hole of the annular closed plate 531 of the upper air jet head 530 of the combustible gas main burner 500.

The mixed gas of air and combustible gas is delivered to the first gas supply pipe 102, and the mixed gas of air and combustible gas enters the cylindrical casing 101; voltage, an electric spark is generated, and the mixture of air and combustible gas in the cylindrical casing 101 is ignited to form a normally open flame. The combustible gas in the gas is re-combusted, and the constant flame is sprayed to the center of the cylindrical jet sleeve 533 through the radial nozzle 110 on the cylindrical casing 101; at the same time, the air is delivered to the air inlet short pipe 517 and the gas inlet short pipe. 518 transports combustible gas, air and combustible gas are mixed in the lower casing part 511 to form the main combustion gas, and then the main combustion gas enters the upper casing part 512 through the central through hole 516 on the partition plate 513, and then passes through a plurality of air and fuel gas. The mixed gas conduit 550 enters the space between the tapered guide sleeve 532 and the cylindrical air-jet sleeve 533, and then enters the cylindrical shape through a plurality of small circular through holes 534 and a plurality of vertical narrow openings 535 on the cylindrical air-jet sleeve 533 In the space surrounded by the jet sleeve 533, the main combustion gas rises and is ignited by the constant flame to form the main combustion.

In the constant open flame device 100 of the present invention, since the cylindrical casing 101 and the circular support plate 130 jointly define a substantially closed space, the mixed gas of air and combustible gas burns in it, and is not affected by any external environment. The flame of the open flame is stable; due to the continuous supply of air to the basically closed space, the combustible gas in the open flame is re-burned, and the generation of carbon monoxide is completely eliminated; because the flame of the open flame is sprayed to the cylindrical shape through the radial nozzle 110 In the center of the jet sleeve 533, the constant open flame sprayed into the cylindrical jet sleeve 533 has a high concentration and is powerful, and can ignite the main combustion gas at any time to form the main combustion.

Referring to FIG. 22 , on the basis of the gas stove 2000 of the present invention shown in FIG. 21 , a combustible gas auxiliary burner 200 of the present invention shown in FIG. 20 is added to obtain the gas stove of the present invention shown in FIG. 22 3000.

In the gas stove 3000 of the present invention shown in FIG. 22 , the vertical parts of the L-shaped gas supply pipe 202 of the combustible gas sub-burner 200 are sealed and welded to the top wall plate 451 of the horizontal water absorption tank 450 inside the stove body 400 respectively. On the hole wall of the corresponding hole of the bottom wall plate 452 and the hole wall of the corresponding hole of the bottom wall plate 452, the horizontal part of the L-shaped gas supply pipe 202 is sealingly welded to the hole wall of the corresponding hole of the lower casing part 511 of the combustible gas main burner 500 , so that the combustible gas sub-burner 200 is fixedly installed in the cooktop 400 .

The mixed gas of air and combustible gas is delivered to the L-shaped air supply pipe 202, and the mixed gas of air and combustible gas enters the central blind hole 204 of the cylindrical combustion head 201, and then is sprayed to the cylindrical jet sleeve through a plurality of radial through holes 205 In the center of 533, the mixture of air and combustible gas rises and is ignited by the ever-open flame, forming a secondary combustion.

When the main combustion which produces strong combustion is not required, the secondary combustion which produces normal combustion can be used as an option.

Claims (3)

1. A normally open fire device is characterized by comprising a housing, a supporting plate, a first air supply pipe, a second air supply pipe and a pair of ignition components; the bottom end of the housing is open, a spray pipe is communicated with the side wall of the housing, each ignition assembly is provided with a guide pipe, the upper ends of the first air supply pipe, the second air supply pipe and the guide pipes of the pair of ignition assemblies are hermetically connected to the hole wall of the corresponding through hole of the support plate, the housing covers the support plate, and the ignition needles of the pair of ignition assemblies are positioned in the housing.

2. A gas stove is provided with a main burner and a normally open fire device, and is characterized in that the normally open fire device comprises a cover shell, a supporting plate, a first air supply pipe, a second air supply pipe and a pair of ignition components; the bottom end of the housing is open, a spray pipe is communicated with the side wall of the housing, each ignition assembly is provided with a guide pipe, the upper ends of the first air supply pipe, the second air supply pipe and the guide pipes of the pair of ignition assemblies are hermetically connected to the hole wall of the corresponding through hole of the support plate, the housing covers the support plate, the ignition needles of the pair of ignition assemblies are positioned in the housing, and the normally open flame device is arranged at the periphery of the main burner.

3. A gas stove is provided with a main burner and a normally open fire device, and is characterized in that the normally open fire device comprises a cover shell, a supporting plate, a first air supply pipe, a second air supply pipe and a pair of ignition components; the bottom end of the housing is open, a spray pipe is communicated with the side wall of the housing, each ignition assembly is provided with a guide pipe, the upper ends of the first air supply pipe, the second air supply pipe and the guide pipes of the pair of ignition assemblies are hermetically connected to the hole wall of the corresponding through hole of the support plate, the housing covers the support plate, the ignition needles of the pair of ignition assemblies are positioned in the housing, and the normally open flame device is arranged at the periphery of the main burner; the burner is also provided with an auxiliary burner, the auxiliary burner is provided with a burning head and an air supply pipe, the burning head is provided with a central blind hole and a plurality of radial through holes, the plurality of radial through holes are communicated with the central blind hole, and the upper end of the air supply pipe extends into the central blind hole; the secondary burner is disposed within the primary burner.

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