CN112648612A - Normally open fire device and gas stove thereof - Google Patents

Abstract

A normally open fire device comprises a cover shell, a supporting plate, a first air supply pipe and a fire damper, wherein the bottom end of the cover shell is open, a spray pipe is communicated with the side wall of the cover shell, the upper end of the first air supply pipe is hermetically connected to the hole wall of a first through hole of the supporting plate, the cover shell covers the supporting plate, and the fire damper is provided with a fire damper which is right in front of a port of the spray pipe and leaves the port. The normally open fire device can quickly ignite the mixed gas of air and combustible gas delivered to the main burner when the pressure of the mixed gas is small, and the combustion heat in the hearth is not eccentric when the amount of the mixed gas of air and combustible gas delivered to the main burner is small.

Description

Normally open fire device and gas stove thereof

Technical Field

The invention relates to a stove, in particular to a normally open fire device and a gas stove thereof.

Background

An existing gas stove is shown in fig. 13 to 17.

Referring to fig. 13 to 17, the gas stove 4000 has a burner body 400, a main burner 500 for combustible gas, and a normally open flame unit 600.

Referring to fig. 13 and 14, the cooktop 400 has a hearth inner-ring heat absorption water tank 410, a hearth outer-ring heat absorption water tank 420, a hearth inner-lateral heat absorption water tank 450, and an outer-lateral heat absorption water tank 430. The outer transverse heat absorption water tank 430 has an inner rectangular cylinder 431 and an outer rectangular cylinder 432, and a space between an outer surface of the inner rectangular cylinder 431 and an inner surface of the outer rectangular cylinder 432 is a space where the outer transverse heat absorption water tank 430 receives water. The bottom of the hearth inner ring heat absorption water tank 410 is communicated with the bottom of the hearth outer ring heat absorption water tank 420. The furnace outer ring heat absorption water tank 420 is communicated with the space of the outer transverse heat absorption water tank 430 for containing water. A short tube 480 connects the top space of the furnace inner ring heat absorption water tank 410 with the middle space of the furnace outer ring heat absorption water tank 420. The space between the outer cylindrical wall plate of the hearth inner ring heat absorption water tank 410 and the inner cylindrical wall plate of the hearth outer ring heat absorption water tank 420 is an inner annular flue gas channel 421 of the stove body 400. The inner rectangular cylinder 431 is a transverse flue gas channel of the oven body 400. The inner annular flue gas channel 421 communicates with the space enclosed by the inner rectangular cylinder 431 as a transverse flue gas channel. The top wall plate of the hearth inner ring heat absorption water tank 410 extends outwards and is welded with the inner cylinder wall plate of the hearth outer ring heat absorption water tank 420 in a sealing mode to form an annular top plate 413, the upper part of the inner annular flue gas channel 421 is sealed, a plurality of through holes are formed in the annular top plate 413, or four through holes 414 are formed in the annular top plate 413 far away from the outer transverse heat absorption water tank 430, so that the upper hearth 411 formed by the space surrounded by the part, located above the annular top plate 413, of the inner cylinder wall plate of the hearth outer ring heat absorption water tank 420 is communicated with the inner annular flue gas channel 421. A plurality of communicating pipes 434 are hermetically welded between the top wall plate and the bottom wall plate of the internal rectangular cylinder 431 of the external transverse heat absorption water tank 430, so that the top space and the bottom space of the internal rectangular cylinder 431 in the external rectangular cylinder 432 of the external transverse heat absorption water tank 430 are communicated, and the heating effect of high-temperature gas generated by combustion of the external transverse flue gas channel on water in the external transverse heat absorption water tank 430 can be improved.

The hearth internal transverse heat absorption water tank 450 has a top wall plate 451 and a bottom wall plate 452, and the outer circumferential edges of the top wall plate 451 and the bottom wall plate 452 are welded to the lower edge of the upper inner conical wall plate 416 and the upper edge of the lower inner conical wall plate 418 of the hearth inner ring heat absorption water tank 410, respectively, so that the hearth internal transverse heat absorption water tank 450 communicates with the hearth inner ring heat absorption water tank 410. The space surrounded by the upper inner conical wall 416 of the furnace inner ring heat absorption water tank 410 constitutes the lower furnace 412. The upper furnace 411 is communicated with the lower furnace 412.

One end of a smoke exhaust pipe 433 is hermetically welded to an opening in the side wall plate of the inner rectangular cylinder 431, and the other end thereof protrudes from an opening in the side wall plate of the outer rectangular cylinder 432 and is hermetically welded to the opening.

Referring to fig. 15-17, the main burner 500 of combustible gas has a lower disc-shaped shell 510, a lower circular tube sheet 520, an upper circular tube sheet 540, an upper gas showerhead 530, and a plurality of conduits 550.

The lower disc-shaped housing 510 is welded to an intake stub 511.

The lower circular tube sheet 520 has a central circular recess 521. The upper circular tube sheet 540 has a central circular groove 541. The lower circular tube plate 520 has a plurality of through holes 522, and the through holes 522 are circular flat plate portions around the center circular recess 521, and the centers of the through holes 522 are on the same circle 524. The upper circular tube plate 540 has a plurality of through holes 542, and the through holes 542 are circular flat plate portions around the center circular groove 541, and the centers of the through holes are on the same circle 524. The upper and lower ends of the plurality of tubes 550 are welded to the inner walls of the corresponding plurality of through-holes 542 of the upper circular tube plate 540 and the corresponding plurality of through-holes 522 of the lower circular tube plate 520, respectively.

The circular top edge of the lower disc-shaped shell 510 is welded to the lower surface of the lower circular tube sheet 520, surrounding the lower ends of the plurality of tubes 550.

The upper showerhead 530 has a circular locating boss 531, a substantially conical guide boss 532 and a circular gas injection boss 533. The upper portion of the circular air injection sleeve 533 is provided with a plurality of small circular through holes 534. The circular gas-jet jacket 533 has a plurality of vertical narrow openings 535 at its lower-middle portion.

A circular locating boss 531 is spot welded to the upper surface of the upper circular tube sheet 540. The conical guide sleeve 532 has an annular flange portion at its lower end, which is located within the circular positioning sleeve 531, and its lower surface contacts the upper surface of the upper circular tube sheet 540. The circular air injection bush 533 is located in the conical guide bush 532, and its lower end surface is in contact with the upper surface of the upper circular tube plate 540 and its upper end outer circumferential surface is in contact with the upper end side surface of the conical guide bush 532. The upper ends of the plurality of conduits 550 are located within the area encompassed by the lower end of the conical guide sleeve 532 and the lower end of the circular jet sleeve 533.

The circular edges of the lower circular tube plate 520 and the upper circular tube plate 540 of the main burner 500 are welded to the hole walls of the central through holes of the bottom wall plate 452 and the top wall plate 451 of the horizontal heat absorption water tank 450 inside the firebox of the burner body 400, respectively, so that the main burner 500 is installed in the burner body 400.

Referring to fig. 13 and 14, the normally open fire unit 600 has a cylindrical housing 601, a circular support plate 602, a radial nozzle 604, a first air supply duct 605, a second air supply duct 606 and two firing assemblies 603.

The bottom end of the cylindrical casing 601 is open. The radial nozzles 604 are attached to the cylindrical wall of the cylindrical housing 601. Each sparking assembly 603 has a sleeve 6031 and a firing pin assembly 6032. The first air supply pipe 605 and the second air supply pipe 606 are located on a perpendicular bisector of a line connecting centers of the two ignition modules 603, on both sides of the line connecting centers of the two ignition modules 603.

The outer walls of the first air supply pipe 605, the second air supply pipe 606 and the sleeve 6031 of the two ignition assemblies 603 are welded to the wall of the corresponding through hole on the upper inner conical wall 416 and the lower inner conical wall 418 of the hearth inner ring heat absorption water tank 410 of the range body 400. The upper ends of the first air supply pipe 605, the second air supply pipe 606 and the sleeve 6031 of the two ignition assemblies 603 extend out of the corresponding through holes in the upper inner conical wall plate 416, extend into the corresponding through holes in the circular support plate 602, and are welded to the wall of the corresponding through holes. The lower ends of the first gas supply pipe 605 and the second gas supply pipe 606 protrude from the respective through holes in the lower inner conical wall plate 418. The two firing pin assemblies 6032 are respectively installed in two sleeves 6031, and two tips of the two firing pins of the two firing pin assemblies 6032 are obliquely opposite and are located above the top end of the first air supply pipe 605. According to the difference of the circuit connection of the two firing pin assemblies 6032, the two tips of the two firing pins can be fired to the ground respectively or each other.

The lower end of a square cartridge 610 is spot welded to the upper inner conical wall 416. The centers of the upper ends of the four wall plates of the square cylinder seat 610 are respectively provided with a groove, the outer circle edge of the circular support plate 602 is provided with four projections, the circular support plate 602 is supported on the square cylinder seat 610, and the four projections are respectively matched with the four grooves.

The cylindrical housing 601 is supported on the circular support plate 602, the upper ends of the first air supply pipe 605, the second air supply pipe 606 and the sleeve 6031 of the two ignition assemblies 603 are located in the cylindrical housing 601, the outlet ends of the radial nozzles 604 are slightly higher than the upper ends of the circular jet sleeve 533 and the conical guide sleeve 532 of the main burner 500 for combustible gas, and can extend into the cylindrical space surrounded by the circular jet sleeve 533, but the length of the extension is smaller than the radius of the circular jet sleeve 533, or as shown in the figure, the extension does not extend into the cylindrical space surrounded by the circular jet sleeve 533 and just corresponds to the inner wall of the circular jet sleeve 533.

The operation of the gas stove 4000 will be described in detail with reference to the accompanying drawings:

referring to fig. 13 and 14, a mixed gas of air and a combustible gas is supplied to the first gas supply pipe 605, and the mixed gas of air and the combustible gas enters the cylindrical casing 601; the two firing pins of the two firing pin assemblies 6032 generate electric sparks, mixed gas of air and combustible gas in the cylindrical housing 601 is ignited to form normally open fire, meanwhile, air is supplemented into the cylindrical housing 601 through the second air supply pipe 606, so that the combustible gas in the normally open fire is subjected to secondary combustion, and flame of the normally open fire is sprayed to the center of the circular air spraying sleeve 533 through the radial spray pipe 604; meanwhile, mixed gas of air and combustible gas is conveyed to the air inlet short pipe 511 of the lower disc-shaped shell 510 of the main combustible gas burner 500, the mixed gas of air and combustible gas enters the space surrounded by the conical guide sleeve 532 and the circular gas spraying sleeve 533 through a plurality of guide pipes 550, then enters the space surrounded by the circular gas spraying sleeve 533 through a plurality of small circular through holes 534 and a plurality of vertical narrow openings 535 on the circular gas spraying sleeve 533, and the mixed gas of air and combustible gas rises and is ignited by flame of normal open fire to form main combustion.

A pan (not shown) is supported on top of the outer periphery of the furnace heat absorption water tank 420 to substantially seal the space of the upper furnace 411. On the other hand, under the condition that the space of the upper hearth 411 is basically sealed by the pot, the high-temperature flue gas is filled in the space of the upper hearth 411 and the space of the lower hearth 412 to heat the water in the heat absorption water tank 410 at the inner ring of the hearth, the heat absorption water tank 420 at the outer ring of the hearth and the transverse heat absorption water tank 450 inside the hearth, then enters the inner annular flue gas channel 421 through the four through holes 414 to heat the water in the heat absorption water tank 410 at the inner ring of the hearth and the heat absorption water tank 420 at the outer ring of the hearth, then enters the space surrounded by the inner rectangular cylinder 431 serving as the transverse flue gas channel to heat the water in the outer transverse heat absorption water tank 430, and finally is discharged out of the stove body 400 through the smoke discharge pipe 433.

In the normally open flame unit 600 used in the gas stove 4000, the outlet end of the radial nozzle 604 is slightly higher than the upper ends of the circular jet sleeve 533 and the conical guide sleeve 532 of the main burner 500 of the combustible gas, the normally open flame is jetted to the center of the circular jet sleeve 533 through the radial nozzle 604 to form a horizontal flame column, the flame range is concentrated, when the pressure of the mixed gas of the air and the combustible gas delivered to the main burner 500 through the air inlet stub 511 of the lower disc-shaped housing 510 of the main burner 500 is low, the pressure of the gas and combustible gas mixture sprayed into the cylindrical space surrounded by the circular gas-spraying sleeve 533 from the plurality of small circular through holes 534 at the upper part of the circular gas-spraying sleeve 533 and the plurality of vertical narrow openings 535 at the middle and lower part is small, the gas and combustible gas mixture flows upwards slowly, and cannot be quickly contacted with the horizontal normally open flame columns with concentrated flame ranges, so that the mixed gas of the air and the combustible gas of the main combustible gas burner 500 is not easy to ignite; in addition, the heat emitted from the horizontal flame column formed by the normal open fire is concentrated, when the amount of the mixed gas of the air and the combustible gas delivered to the main burner 500 through the short air inlet pipe 511 of the lower disc-shaped shell 510 of the main burner 500 is small, the main combustion flame generated by the main burner 500 is small and distributed in the cylindrical space surrounded by the circular air jet sleeve 533, and the emitted heat is dispersed, so that the heat in the space area in the upper furnace 411, which is closer to the outlet end of the radial nozzle 604, is more, the temperature is higher, the heat in the space area farther away is less, the temperature is lower, the combustion heat in the upper furnace 411 is eccentric, and disadvantages are brought to cooking.

Disclosure of Invention

The invention provides an improved normally open fire device and a gas stove thereof, aiming at solving the technical problems that the main combustion is difficult to ignite under the condition that the main combustion is weaker and the combustion heat is eccentric in an upper hearth in the normally open fire combustion generated by the conventional normally open fire unit for the gas stove.

The normally open fire device is characterized by comprising a cover shell, a supporting plate, a first air supply pipe and a fire damper, wherein the bottom end of the cover shell is open, a spray pipe is communicated with the side wall of the cover shell, the upper end of the first air supply pipe is hermetically connected to the hole wall of a first through hole of the supporting plate, the cover shell covers the supporting plate, and the fire damper is provided with a fire damper which is arranged right in front of a port of the spray pipe and leaves the port.

According to the normally open flame device, the fire baffle plate is arranged right in front of the port of the spray pipe and leaves the port, when normally open flame is sprayed out from the port of the radial spray pipe, the flame is blocked by the circular fire baffle plate, the original flame column with the concentrated horizontal flame range is dispersed along the plane of the circular fire baffle plate, a part of flame extends downwards and is rapidly contacted with the air and the mixed gas of the combustible gas which flow slowly and upwards under small pressure in the cylindrical space surrounded by the circular spray cover sprayed from the small circular through holes at the upper part of the circular spray cover and the vertical narrow openings at the middle lower part of the circular spray cover, and the mixed gas of the air and the combustible gas of the main burner 500 of the combustible gas can be ignited immediately; in addition, the flame column that original horizontal flame scope was concentrated is dispersed along the plane of circular fire baffle and is come, and the heat of giving out no longer concentrates, and the heat in the space region nearer from the exit end of radial spray tube in the furnace of upper portion is more, and the higher phenomenon of temperature can not appear, and heat and temperature in the cylindric space that circular air injection cover surrounded tend to average, have solved the interior burning heat of upper portion furnace eccentric, bring unfavorable problem for the cooking.

The gas stove of the invention is provided with a main burner and a normally open flame device, and is characterized in that the normally open flame device comprises a cover shell, a supporting plate, a first air supply pipe and a flame arrester, wherein the bottom end of the cover shell is open, the side wall of the cover shell is communicated with a spray pipe, the upper end of the first air supply pipe is hermetically connected to the hole wall of a first through hole of the supporting plate, the cover shell covers the supporting plate, and the flame arrester is provided with a flame arrester which is arranged right in front of a port of the spray pipe and leaves the port.

The normally open fire device is also provided with a second air supply pipe, and the upper end of the second air supply pipe is hermetically connected to the hole wall of a second through hole of the support plate.

The gas cooking range of the present invention further has a second air supply pipe whose upper end is sealingly coupled to a hole wall of a second through hole of the support plate.

Drawings

Fig. 1 is a longitudinal sectional view schematically showing a first embodiment of a gas range of the present invention;

FIG. 2 is a top schematic view of the gas stove of FIG. 1;

fig. 3 is a longitudinal sectional view schematically showing a second embodiment of the gas range of the present invention;

FIG. 4 is a top schematic view of the gas stove of FIG. 3;

fig. 5 is a longitudinal sectional view schematically showing a third embodiment of the gas range of the present invention;

FIG. 6 is a top schematic view of the gas stove of FIG. 5;

fig. 7 is a perspective schematic view of a first embodiment of a normally open fire damper in the gas stove of the first embodiment of the present invention shown in fig. 1 and 2;

fig. 8 is a perspective schematic view of a second embodiment of an always-on fire damper in the gas stove of the first embodiment of the present invention shown in fig. 1 and 2;

fig. 9 is a perspective schematic view of a first embodiment of an always-on fire damper in the gas stove of the second embodiment of the present invention shown in fig. 3 and 4;

FIG. 10 is a perspective schematic view of a second embodiment of an normally open flame arrestor plate in the gas stove of the second embodiment of the present invention shown in FIGS. 3 and 4;

fig. 11 is a perspective schematic view of a first embodiment of an always-on fire damper in the gas range of fig. 5 and 6 according to the third embodiment of the present invention;

fig. 12 is a perspective schematic view of a second embodiment of an normally open fire damper in the gas range of the third embodiment of the present invention shown in fig. 5 and 6;

fig. 13 is a longitudinal sectional view of an existing gas cooking stove;

FIG. 14 is a top schematic view of the active gas stove of FIG. 13;

fig. 15 is a longitudinal sectional view schematically showing a main burner in the gas range for use as shown in fig. 13 and 14;

FIG. 16 is a schematic cross-sectional view taken along line A-A of FIG. 15;

fig. 17 is a schematic sectional view taken along line B-B in fig. 15.

Detailed Description

The features and advantages of the normally open flame device and the gas range of the present invention will become more apparent from the following detailed description of the embodiments of the normally open flame device and the gas range thereof, which are described in conjunction with the accompanying drawings.

Referring to fig. 1 and 2, a gas stove 1000 according to a first embodiment of the present invention is constructed mostly the same as the gas stove 4000 for use as now shown in fig. 13 and 14, and also has a burner body 400, a main burner 500 for combustible gas, and a normally open fire unit 600, and like parts are denoted by like reference numerals and will not be described again.

The gas stove 1000 according to the first embodiment of the present invention shown in fig. 1 and 2 is different from the construction of the gas stove 4000 that is currently used as shown in fig. 13 and 14 in that the gas stove 1000 according to the first embodiment of the present invention further has a normally open flame arrestor 10 or a normally open flame arrestor 20.

Referring to fig. 7, the normally open fire damper 10 has a circular seat plate 11, an elongated arm plate 13 and a circular fire damper plate 12. The edges of the two ends of the elongated arm plate 13 are respectively connected with the edges of the circular seat plate 11 and the circular fire baffle plate 12 in a welding way, and the circular fire baffle plate 12 and the elongated arm plate 13 are inclined relative to the circular seat plate 11. The circular seat plate 11, the elongated arm plate 13 and the circular fire damper plate 12 can be integrally formed.

Referring to fig. 8, the normally open fire damper 20 has a circular seat plate 21, an elongated arm plate 23 and a circular fire damper plate 22. The edges of the two ends of the elongated arm plate 23 are respectively connected with the edges of the circular seat plate 21 and the circular fire baffle plate 22 in a welding way, and the circular fire baffle plate 22 and the elongated arm plate 23 are vertical. The circular seat plate 21, the elongated arm plate 23 and the circular fire damper plate 22 can be integrally formed.

Referring to fig. 1 and 2, the normally open flame arrester 10 or 20 is installed in the main burner 500 of the gas range 1000 according to the first embodiment of the present invention, and the circular seat plate 11 or 21 is seated in the central circular groove 541 of the main burner 500 and supported on the upper circular tube plate 540 of the main burner 500, and referring to fig. 1 and 2 and fig. 7 and 8, the circular fire damper 12 or 22 exits from the port of the radial nozzle 604 of the normally open flame unit 600 just in front of the port.

Referring to fig. 3 and 4, a gas stove 2000 in accordance with a second embodiment of the present invention is constructed mostly the same as the gas stove 4000 for use now shown in fig. 13 and 14, and also has a burner body 400, a main burner 500 for combustible gas, and a normally open fire unit 600, and like parts are denoted by like reference numerals and will not be described again.

The gas stove 2000 of the second embodiment of the present invention shown in fig. 3 and 4 is different from the construction of the gas stove 4000 that is currently used as shown in fig. 13 and 14 in that the gas stove 2000 of the second embodiment of the present invention further has a normally open flame arrestor 30 or a normally open flame arrestor 40.

Referring to FIG. 9, the normally open flame arrestor 30 has a semi-circular base plate 31, an elongated arm plate 33 and a circular fire stop plate 32. The edges of the two ends of the elongated arm plate 33 are respectively welded with the edges of the semicircular seat plate 31 and the circular fire baffle plate 32, and the circular fire baffle plate 32 is inclined relative to the elongated arm plate 33 and the semicircular seat plate 31. The semicircular seat plate 31, the elongated arm plate 33 and the circular fire damper plate 32 can be integrally formed.

Referring to FIG. 10, the normally open flame arrester 40 has a semi-circular seat plate 41, an elongated arm plate 43 and a circular fire damper plate 42. The edges of the two ends of the elongated arm plate 43 are respectively welded with the edges of the semicircular seat plate 41 and the circular fire damper plate 42, and the circular fire damper plate 42 is vertical. The semicircular seat plate 41, the elongated arm plate 43, and the circular fire damper plate 42 can be integrally formed.

Referring to fig. 3 and 4, the normally open flame arrester 30 or 40 is mounted on the normally open flame unit 600 of the gas range 2000 according to the second embodiment of the present invention, the top wall of the cylindrical housing 601 of the normally open flame unit 600 has a projection 618, the semicircular seat plate 31 of the normally open flame arrester 30 or 41 of the normally open flame arrester 40 is supported on the top wall of the cylindrical housing 601 of the normally open flame unit 600, and the projection 618 is upwardly projected into the groove of the semicircular seat plate 31 or 41, and referring to fig. 3 and 4 and 9 and 10, the circular flame arrester 32 or 42 is directly in front of and out of the port of the radial nozzle 604 of the normally open flame unit 600.

Referring to fig. 5 and 6, a gas stove 3000 according to a third embodiment of the present invention is constructed mostly the same as the conventional gas stove 4000 shown in fig. 13 and 14, and also has a burner body 400, a main burner 500 for combustible gas, and a normally open fire unit 600, and like parts are denoted by like reference numerals and will not be described again.

The gas stove 3000 of the third embodiment of the present invention shown in fig. 5 and 6 is different from the construction of the gas stove 4000 that is currently used as shown in fig. 13 and 14 in that the gas stove 3000 of the third embodiment of the present invention further has a normally open flame arrestor 50 or a normally open flame arrestor 60.

Referring to fig. 11, the normally open fire damper 50 has an elongated arm plate 53 and a circular fire damper plate 52. The edges of the two ends of the elongated arm plate 53 are respectively welded with the top edge of the port of the radial nozzle 604 of the normally open fire unit 600 and the edge of the circular fire damper plate 52, and the circular fire damper plate 52 is inclined relative to the elongated arm plate 53.

Referring to FIG. 12, the normally open flame arrestor 60 has an elongated arm plate 63 and a circular fire stop plate 62. The edges of the two ends of the elongated arm plate 63 are respectively welded with the top edge of the port of the radial nozzle 604 of the normally open fire unit 600 and the edge of the circular fire damper plate 62, and the circular fire damper plate 62 is vertical.

Referring to fig. 5 and 6, one end of the elongated arm plate 53 of the normally open flame arrester 50 or one end of the elongated arm plate 63 of the normally open flame arrester 60 is welded to the top edge of the port of the radial nozzle 604 of the normally open flame unit 600, and referring to fig. 5 and 6 and fig. 11 and 12, the circular flame arrester plate 52 or the circular flame arrester plate 62 exits the port directly in front of the port of the radial nozzle 604 of the normally open flame unit 600.

As can be seen from the gas cooktop 1000 of the first embodiment of the present invention shown in fig. 1 and 2, the gas cooktop 2000 of the second embodiment of the present invention shown in fig. 3 and 4, and the gas cooktop 3000 of the third embodiment of the present invention shown in fig. 5 and 6, the gas cooktops of the three embodiments of the present invention have the normally open fire damper 10 shown in fig. 7 or 20 shown in fig. 8, the normally open fire damper 30 shown in fig. 9 or 40 shown in fig. 10, and the normally open fire damper 50 shown in fig. 11 or 60 shown in fig. 12, respectively, the circular fire damper 12 or 22, 32 or 42, and 52 or 62 are all right in front of the port of the radial nozzle 604 of the normally open fire unit 600, leaving the port, so that, when the flame is ejected from the radial nozzle 604 of the radial nozzle, blocked by the circular fire baffle, the original flame columns with concentrated horizontal flame ranges are scattered along the plane of the circular fire baffle, a part of the flame extends downwards and is rapidly contacted with the mixed gas of air and combustible gas which flows slowly and upwards under small pressure in the cylindrical space surrounded by the circular air jet sleeve 533 and sprayed from the plurality of small circular through holes 534 at the upper part of the circular air jet sleeve 533 and the plurality of vertical narrow openings 535 at the middle lower part, and the mixed gas of the air and the combustible gas of the main combustible gas burner 500 can be ignited immediately; in addition, the flame columns concentrated in the original horizontal flame range are diffused along the plane of the circular fire baffle, the emitted heat is not concentrated, the heat in the space area, close to the outlet end of the radial spray pipe 604, in the upper hearth 411 is more, the phenomenon of higher temperature cannot occur, the heat and the temperature in the cylindrical space surrounded by the circular spray pipe 533 tend to be average, and the problem that the combustion heat is eccentric in the upper hearth 411 and brings disadvantages to cooking is solved.

Claims (4)

1. A normally open fire device is characterized by comprising a cover shell, a supporting plate, a first air supply pipe and a fire damper, wherein the bottom end of the cover shell is open, a spray pipe is communicated with the side wall of the cover shell, the upper end of the first air supply pipe is hermetically connected to the hole wall of a first through hole of the supporting plate, the cover shell covers the supporting plate, and the fire damper is provided with a fire damper which is arranged right in front of a port of the spray pipe and leaves the port.

2. A normally open fire device according to claim 1, further comprising a second air supply duct, an upper end of the second air supply duct being sealingly connected to a wall of a second through hole of the support plate.

3. A gas stove has a main burner and a normally open flame device, characterized in that the normally open flame device comprises a housing, a support plate, a first gas supply pipe and a flame arrester, the bottom end of the housing is open, the side wall is communicated with a jet pipe, the upper end of the first gas supply pipe is hermetically connected with the hole wall of a first through hole of the support plate, the housing covers the support plate, the flame arrester is provided with a flame arrester, and the flame arrester is right in front of the port of the jet pipe and leaves the port.

4. A gas cooking stove as claimed in claim 3, further comprising a second gas supply duct having an upper end sealingly connected to a wall of a second through hole of the support plate.

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