Combustor and gas stove

Abstract

The application belongs to the technical field of kitchen and bath electrical appliances, and particularly relates to a burner and a gas stove. The burner comprises a gas distribution disc, an inner ring fire cover and an outer ring fire cover. The gas distribution disc comprises a second air guide plate and a third air guide plate. The second air guide plate is arranged between an inner ring gas mixing chamber and an outer ring gas mixing chamber of the gas distribution disc. A plurality of second air guide holes are arranged on the second air guide plate. The third air guide plate is arranged outside the outer ring gas mixing chamber of the gas distribution disc. A plurality of third air guide holes are arranged on the third air guide plate. The fire hole of the inner ring fire cover is arranged to face the outer ring of the inner ring fire cover. The fire hole of the outer ring fire cover is arranged to face the outer ring of the outer ring fire cover. The application can improve the supplement of secondary air, so that the gas can be completely combusted in the best state, and has good practicability.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of kitchen and bath electrical appliances, and particularly relates to a burner and a gas stove. BACKGROUND

[0002] The gas stove is a kind of widely used kitchen appliance.

[0003] During use, the gas stove introduces primary air and secondary air. In the prior art, most manufacturers improve the primary air supplement by optimizing the burner head, gas distribution disc and fire cap structure, and improve the secondary air supplement by optimizing the fire hole structure and increasing the contact area between the fire hole and the air.

[0004] The above-mentioned way of improving the secondary air supplement cannot make the gas completely burn in the best state, and there is room for improvement. SUMMARY

[0005] To solve the above technical problems, the present application provides a burner and a gas stove, which aims to at least improve the secondary air supplement to the greatest extent and make the gas completely burn in the best state.

[0006] The technical scheme of the present application is as follows:

[0007] On the one hand, the present application provides a burner, which is characterized in that the burner comprises a gas distribution disc, an inner ring fire cap and an outer ring fire cap, wherein:

[0008] The gas distribution disc comprises a second air guide plate and a third air guide plate, the second air guide plate is arranged between the inner ring mixing chamber and the outer ring mixing chamber of the gas distribution disc, a plurality of second air guide holes are arranged on the second air guide plate, the third air guide plate is arranged outside the outer ring mixing chamber, and a plurality of third air guide holes are arranged on the third air guide plate.

[0009] The fire hole of the inner ring fire cap is arranged to face the outer ring of the inner ring fire cap, and the fire hole of the outer ring fire cap is arranged to face the outer ring of the outer ring fire cap.

[0010] In some embodiments, the gas distribution disc further comprises a first air guide plate, the first air guide plate is arranged inside the inner ring of the inner ring mixing chamber of the gas distribution disc, and a plurality of first air guide holes are arranged on the first air guide plate.

[0011] In some embodiments, a first ring sleeve is coaxially arranged on the top surface of the gas distribution disc, the first air guide plate is arranged on the top of the first ring sleeve, and the projections of the plurality of first air guide holes on the gas distribution disc are located in the projection of the first ring sleeve on the gas distribution disc.

[0012] In some embodiments, the gas distribution disc further comprises a second ring, the first air guide plate is fixedly arranged at the middle of the inner portion of the second ring, the lower portion of the second ring is detachably arranged on the outer circumferential surface of the top portion of the first ring, and the bottom of the outer ring of the inner ring cover is detachably arranged on the top portion of the second ring.

[0013] In some embodiments, the combustor further comprises a first air guide, the first air guide comprises a third ring and a cover plate, wherein:

[0014] the third ring is fittedly arranged in the inner circumference of the second ring, the cover plate is arranged above the third ring, the cover plate and the top portion of the third ring are connected by a plurality of first connecting columns arranged at intervals, and the cover plate is supported on the top portion of the outer ring of the inner ring cover by a plurality of second connecting columns arranged at intervals.

[0015] In some embodiments, the top surface of the gas distribution disc is coaxially provided with a fourth ring and a fifth ring, the fourth ring and the fifth ring are coaxially arranged outside the first ring in sequence;

[0016] the second air guide plate is detachably arranged on the top portion of the fourth ring and the fifth ring, and a plurality of the second air guide holes are located between the projections of the fourth ring and the fifth ring on the gas distribution disc.

[0017] In some embodiments, the gas distribution disc further comprises a sixth ring and a seventh ring, the sixth ring and the seventh ring are connected by the second air guide plate, the lower portion of the sixth ring is detachably arranged on the inner circumferential surface of the top portion of the fourth ring, the lower portion of the seventh ring is detachably arranged on the inner circumferential surface of the top portion of the fifth ring, and the outer circumferential surface of the seventh ring is provided with a first support plate supported on the top portion of the fifth ring;

[0018] the bottom of the outer ring of the inner ring cover is detachably arranged on the top portion of the sixth ring, and the bottom of the inner ring of the outer ring cover is detachably arranged on the top portion of the seventh ring.

[0019] In some embodiments, the top surface of the gas distribution disc is further provided with a coaxial eighth ring, the eighth ring is arranged outside the fifth ring, and the third air guide plate is fixedly arranged on the outer circumferential surface of the eighth ring;

[0020] the gas distribution disc further comprises a ninth ring, the bottom of the ninth ring is detachably arranged on the top portion of the eighth ring, and the bottom of the outer ring of the outer ring cover is detachably arranged on the top portion of the ninth ring.

[0021] In some embodiments, the burner also includes a second air guide member, which includes a tenth ring sleeve, the bottom of which is detachably arranged on the top surface of the third air induced plate, the tenth ring sleeve gap is arranged on the outer side of the eighth ring sleeve and the ninth ring sleeve, and a plurality of the third air induced holes are arranged between the tenth ring sleeve and the eighth ring sleeve.

[0022] Furthermore, an annular limit stop ring is provided on the top surface of the third air induction plate, and the limit stop ring is provided on the outside of the plurality of third air induction plates, and the bottom of the tenth ring sleeve is detachably provided on the outer peripheral surface of the limit stop ring.

[0023] The present application provides a burner, in which the second air induced plate of the gas distribution plate of the burner is arranged between the inner ring mixing chamber and the outer ring mixing chamber of the gas distribution plate, and a plurality of second air induced holes are arranged on the second air induced plate. Therefore, when the gas stove is in use, secondary air can be introduced and supplemented into the inner ring fire cover of the burner through the plurality of second air induced holes to increase the amount of secondary air supplemented into the inner ring fire cover of the burner; in addition, since the fire outlet end of the fire hole of the inner ring fire cover is arranged to face the outer ring of the inner ring fire cover, the secondary air introduced and supplemented into the inner ring fire cover of the burner from the plurality of second air induced holes can be directly combined with the gas output from the fire outlet end of the fire hole of the inner ring fire cover, thereby reducing the introduction stroke of the secondary air and achieving a better combustion effect.

[0024] Since the third air induction plate of the gas distribution plate of the burner is arranged outside the outer ring mixing chamber of the gas distribution plate, and multiple third air induction holes are provided on the third air induction plate, when the gas stove is in use, secondary air can be introduced into and supplemented into the outer ring fire cover of the burner through the multiple third air induction holes to increase the amount of secondary air supplemented into the outer ring fire cover and the inner ring fire cover of the burner; in addition, since the fire outlet end of the fire hole of the outer ring fire cover is arranged to face the outer ring of the outer ring fire cover, the secondary air introduced into and supplemented into the outer ring fire cover of the burner from the multiple second air induction holes can be directly combined with the gas output from the fire outlet end of the fire hole of the outer ring fire cover, thereby reducing the introduction stroke of the secondary air and having a better combustion effect.

[0025] On the other hand, the present application also provides a gas stove, which is special in that the gas stove comprises:

[0026] Cover body;

[0027] The burner is assembled on the cover.

[0028] As a preferred embodiment of the present application, the gas stove further comprises:

[0029] A sealed chamber is arranged in the cover body, and a wind inlet is arranged on the side wall of the sealed chamber, a first through hole for the inlet end of the burner head to pass through, and a second through hole for the outlet end of the burner head to pass through;

[0030] A fan is arranged in the sealed chamber and can introduce supplemental secondary air into the sealed chamber through the wind inlet;

[0031] The gas distribution disc of the burner is covered at the second through hole of the sealed chamber, and the plurality of second wind inlets and the plurality of third wind inlets on the gas distribution disc are all located in the second through hole of the sealed chamber in the projection of the cover body.

[0032] The gas stove provided in the present application can improve the supplemental amount of secondary air when the gas stove is in use, and the secondary air introduced into the sealed chamber is supplemented into the burner through the plurality of secondary air inlets on the gas distribution disc, so that the gas is completely combusted in the best state, and the combustion efficiency of the gas stove is improved.

[0033] As can be seen from the above, the burner and the gas stove provided in the present application improve the supplemental amount of secondary air through the fan and the wind inlets arranged on the gas distribution disc, rather than through optimizing the structure of the fire hole and increasing the contact area between the fire hole and air, so as to improve the supplemental amount of secondary air, and the gas is completely combusted in the best state, which has good practicability. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0035] Figure 1 FIG. 1 is a structural schematic diagram of a gas stove according to an embodiment of the present application;

[0036] Figure 2 FIG. 2 is a structural schematic diagram of a burner according to an embodiment of the present application; Figure 1 FIG. 3 is a structural schematic diagram of the burner according to an embodiment of the present application, with a panel removed;

[0037] Figure 3 FIG. 4 is a partial structural schematic diagram of the stove shell according to an embodiment of the present application, with a panel removed; Figure 1 FIG. 5 is a partial structural schematic diagram of the stove shell according to an embodiment of the present application, with a panel removed, viewed from above;

[0038] Figure 4 FIG. 6 is a partial structural schematic diagram of the stove shell according to an embodiment of the present application, with a panel removed, viewed from above; Figure 1 FIG. 7 is a partial structural schematic diagram of the stove shell according to an embodiment of the present application, with a panel removed, viewed from above; and

[0039] FIG. 8 is a partial structural schematic diagram of the stove shell according to an embodiment of the present application, with a panel removed, viewed from above.Figure 5 This is a schematic structural diagram of a burner according to an embodiment of the present application;

[0040] Figure 6 for Figure 5 Schematic cross-sectional view of ;

[0041] Figure 7 for Figure 5 Explosion diagram of

[0042] Figure 8 for Figure 7 Schematic diagram of the assembly of the outer ring fire cover and the inner ring fire cover;

[0043] Figure 9 for Figure 7 A schematic diagram of a top view of the first assembly;

[0044] Figure 10 for Figure 7 A schematic top view of the second assembly in FIG.

[0045] Figure 11 for Figure 7 A schematic structural diagram of the first air guide member in FIG.

[0046] Figure 12 for Figure 7 Schematic diagram of the top view of the inner ring fire cover;

[0047] Figure 13 for Figure 7 Schematic diagram of the structure of the second air guide member.

[0048] In the attached figure:

[0049] 100 - stove shell, 101 - cover, 102 - sealed chamber, 103 - fan, 104 - air inlet, 105 - first through hole, 106 - second through hole, 107 - vertical plate;

[0050] 200-burner, 201-furnace head, 202-gas distribution disc, 203-inner ring flame cover, 204-outer ring flame cover, 205-first air guide plate, 206-first air guide hole, 207-second air guide plate, 208-second air guide hole, 209-third air guide plate, 210-third air guide hole, 211-first ring sleeve, 212-second ring sleeve, 213-third ring sleeve, 214-cover plate, 215-first connecting column, 216-second connecting column, 217-sealing ring, 218-fourth ring sleeve, 219-fifth ring sleeve, 220-sixth ring sleeve, 221-seventh ring sleeve, 222-first support plate, 223-first connecting plate, 224-second connecting plate, 225-eighth ring sleeve, 226-ninth ring sleeve, 227-second support plate, 228-tenth ring sleeve, 229-limiting stop ring, 230-third connecting plate, 231-fourth connecting plate, 232-fifth connecting plate, 233-connecting ring sleeve. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0052] It should be noted that all directionality indications in the embodiments of the present application are only used to explain the relative position relationship, movement condition and the like between components in a certain posture, and if the certain posture changes, the directionality indications also change accordingly.

[0053] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplification of the present application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to the same reference numerals and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides various specific examples of processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0054] The present application will be described below with reference to the drawings and specific embodiments:

[0055] The working principle of the gas stove is that high-pressure gas (natural gas or liquefied gas) enters the valve body of the gas stove from the gas pipeline, and after the valve body is opened, it flows into the nozzle. Since the size of the nozzle is very small, generally less than 2mm, the high-pressure gas becomes high-speed low-pressure gas after flowing out of the nozzle, enters the furnace head venturi structure to form negative pressure (lower than atmospheric pressure), and therefore the primary air is injected into the furnace head. The primary air mixes with the gas and flows out of the furnace head into the gas distribution disc and the fire cover for combustion. During the combustion process, the air in the environment will be supplemented for the second time, i.e. secondary air, to ensure complete combustion of the gas.

[0056] As can be seen from the working principle, the amount of primary air and secondary air is the core key factor to ensure complete combustion of the gas. For the existing gas stove combustion system, the gas is mixed with the primary air before combustion, so it is believed that the primary air basically completely participates in the reaction, and the secondary air participates in the reaction due to the entrainment of the high-speed jet flow of the gas and the buoyancy during the combustion process, so the secondary air does not all completely participate in the reaction. Under the premise of ensuring complete reaction of the gas, the total air quantity should be reduced as much as possible to reduce the heat released by the combustion reaction to heat the excess air, so as to improve the thermal efficiency.

[0057] At present, the supplement of secondary air in the gas stove is generally realized by optimizing the fire hole structure and increasing the contact area of the fire hole and air. It is difficult to effectively and quickly supplement the secondary air, especially when the smoke outlet is reduced, the supplement of secondary air is more difficult, which not only cannot realize a better combustion state, but also causes the flue gas to exceed the standard.

[0058] That is, the above-mentioned way of increasing the amount of secondary air cannot make the gas completely burn in the best state, and there is room for improvement.

[0059] Based on the above technical problems, the embodiment of the present application provides a gas stove, which aims to at least improve the supplement of secondary air to the extent possible to make the gas completely burn in the best state.

[0060] Embodiment one:

[0061] Figure 1 The structure diagram of the gas stove of the embodiment of the present application is shown in Figure 1 The gas stove comprises a stove shell 100 and a burner 200 assembled on the stove shell 100.

[0062] Figure 2 The structure diagram of the burner is shown in Figure 1 The structure diagram of the stove shell of the burner is shown in Figure 3 The structure diagram of the stove shell is shown in Figure 1 The structure diagram of the stove shell is shown in Figure 4 The structure diagram of the stove shell is shown in Figure 1 The structure diagram of the stove shell is shown in Figures 1-4The stove shell 100 of the embodiment of the present application comprises a cover body 101, a sealed chamber 102 and a fan 103, wherein the burner 200 is assembled on the cover body 101, the sealed chamber 102 is arranged in the cover body 101, the side wall of the sealed chamber 102 is provided with an air inlet 104, a first through hole 105 through which the inlet end of the burner head of the burner 200 passes and a second through hole 106 through which the outlet end of the burner head of the burner 200 passes, the fan 103 is arranged in the sealed chamber 102, the gas distribution disc 202 of the burner 200 covers the second through hole 106 of the sealed chamber 102, and a plurality of secondary air vent holes through which the inside of the sealed chamber 102 and the outside are communicated are arranged on the gas distribution disc 202.

[0063] The gas stove provided by the present application can improve the combustion efficiency of the gas stove.

[0064] The cover body 101 of the embodiment of the present application is in the form of a box, which comprises a panel and a box with an open top. The box is embedded in the cooking bench, and the panel is assembled at the opening of the box to seal the box. The second through hole 106 through which the burner passes is arranged on the panel to facilitate the installation of the burner. This is the prior art, and the embodiment of the present application will not be described in detail.

[0065] In combination with Figure 3 and Figure 4 The cover body of the embodiment of the present application is provided with a closed loop stand plate 107. The top of the stand plate 107 is sealed and abuts against the top of the cover body 101, i.e. the top of the stand plate 107 is sealed and abuts against the inner side of the panel. The bottom of the stand plate 107 is sealed and abuts against the bottom of the cover body 101. The stand plate 107 and the cover body 101 can form the above-mentioned sealed chamber 102. The first through hole 105 is arranged on the stand plate 107, and the second through hole 106 is arranged on the top of the cover body 101, i.e. the second through hole 106 arranged on the panel.

[0066] For the embodiment of the present application, the overall shape of the stand plate 107 is preferably square, but it can also be circular, oval or other shapes, which are not limited by the embodiment of the present application.

[0067] In addition, the top and bottom of the stand plate 107 can be fixedly connected to the cover body by welding, or the cover body 101 can be provided with a clamping groove at the position corresponding to the installation of the stand plate 107. The top and bottom of the stand plate 107 are embedded in the clamping groove arranged at the position corresponding to the installation of the stand plate 107 of the cover body 101. Of course, other ways can also be used, which are not limited by the embodiment of the present application.

[0068] In other embodiments, the vertical plate 107 of the present embodiment can also be provided without being closed, for example, two vertical plates 107 of the present embodiment are provided oppositely, and the two sides of the two vertical plates 107 are respectively abutted against the two opposite side walls of the cover body 101. The two vertical plates 107, the two opposite side walls of the cover body 101, and the top and bottom of the cover body 101 can also enclose the above-mentioned sealed chamber 102. The present embodiment does not specifically limit the specific form of the sealed chamber.

[0069] Since the burner head of the prior art burner 200 usually includes an inner ring ejection pipe communicated with the inner ring fire cover 203 of the burner 200, and an outer ring ejection pipe communicated with the outer ring fire cover 204 of the burner 200, correspondingly, two first through holes 105 are also provided on the vertical plate 107, and the two first through holes 105 are respectively for the inner ring ejection pipe and the outer ring ejection pipe of the burner head to pass through.

[0070] Further, the air inlet 104 of the present embodiment is provided on the vertical plate 107, and the fan 102 is installed on the air inlet 104. The output end of the fan 102 faces the inside of the sealed chamber 102. By controlling the start of the fan 102, the air outside the sealed chamber 102 can be introduced into the sealed chamber 102 for supplement.

[0071] In addition, in the present embodiment, a supporting block can also be provided at the bottom of the cover body 101. The supporting block is provided in the sealed chamber 102, and the fan 103 is supported by the supporting block, so as to improve the stability of the installation of the fan 103 in the cover body 101.

[0072] It should be noted that the number of the sealed chambers 102 and the fans 103 of the present embodiment can be set according to the specific number of the burners 200. For example, the cover body 101 of the cooking chamber 100 of the present embodiment is provided with two burners 200. Correspondingly, the present embodiment is also provided with two sealed chambers 102 and two fans 103 corresponding to the two burners 200 in the cover body 101.

[0073] Embodiment two:

[0074] The present embodiment discloses a burner which can at least improve the supplement amount of secondary air to the greatest extent to make the gas burn completely in the best state.

[0075] Figure 5 FIG. 1 is a structural schematic diagram of a burner according to the present embodiment. FIG. 2 is a structural schematic diagram of a burner according to the present embodiment. Figure 5The combustor provided by the embodiment of the present application comprises a gas distribution disc 202, an inner ring flame cover 203 and an outer ring flame cover 204, the inner ring flame cover 203 and the outer ring flame cover 204 are arranged on the gas distribution disc 202, the inner ring flame cover 203 is arranged on the inner side of the outer ring flame cover 204, the flame holes on the inner ring flame cover 203 are connected with the inner ring suction pipe of the burner head 201 through the gas distribution disc 202, the primary air and fuel can be injected into the flame holes of the inner ring flame cover 203 through the inner ring suction pipe of the burner head 201, the flame holes on the outer ring flame cover 204 are connected with the outer ring suction pipe of the burner head 201 through the gas distribution disc 202, the primary air and fuel can be injected into the flame holes of the outer ring flame cover 204 through the outer ring suction pipe of the burner head 201, which is the prior art, and the embodiment of the present application does not make redundant description.

[0076] In order to adjust the flow of the primary air of the inner ring suction pipe and the outer ring suction pipe of the burner head 201, the combustor of the embodiment of the present application further comprises a damper blade for controlling the opening degree of the inlet of the inner ring suction pipe and the outer ring suction pipe, by rotating the damper blade, the opening degree of the primary air inlet of the inner ring suction pipe and the outer ring suction pipe can be adjusted, and then the flow of the primary air of the inner ring suction pipe and the outer ring suction pipe can be adjusted.

[0077] Figure 6 For Figure 5 a cross-sectional view, Figure 7 a schematic view of explosion, Figure 5 a schematic view of assembly of the outer ring flame cover and the inner ring flame cover in Figure 8 Figure 7 Figures 5-8 In the embodiment of the present application, the flame hole of the inner ring flame cover 203 is arranged to face the outer ring of the inner ring flame cover 203, the flame hole of the outer ring flame cover 204 is arranged to face the outer ring of the outer ring flame cover 204, that is, the combustor of the embodiment of the present application generates an external flame.

[0078] Figure 9 For Figure 7 a top view structural schematic view of the first assembly body in Figure 10 a top view structural schematic view of the second assembly body in Figure 7 Figures 5-10 The gas distribution disc 202 of the embodiment of the present application comprises a second air guide plate 207 and a third air guide plate 209, the second air guide plate 207 is arranged between the inner ring mixing chamber and the outer ring mixing chamber of the gas distribution disc 202, a plurality of second air guide holes 208 are arranged on the second air guide plate 207, the third air guide plate 209 is arranged outside the outer ring mixing chamber, and a plurality of third air guide holes 210 are arranged on the third air guide plate 209.

[0079] ​​​The combustor provided by the embodiment of the application has the following advantages: the second air guide plate 207 of the gas distribution disc 202 is arranged between the inner ring gas mixing chamber and the outer ring gas mixing chamber of the gas distribution disc 202, and the second air guide plate 207 is provided with a plurality of second air guide holes 208, so that, during use of the gas stove, secondary air can be introduced into the inner ring fire cover 203 of the combustor through the plurality of second air guide holes 208 to increase the amount of secondary air supplied to the inner ring fire cover 203 of the combustor; in addition, the outlet ends of the fire holes of the inner ring fire cover 203 are arranged to face the outer ring of the inner ring fire cover 203, that is, the secondary air introduced into the inner ring fire cover 203 of the combustor through the plurality of second air guide holes 208 can be directly combined with the gas output from the outlet ends of the fire holes of the inner ring fire cover 203, thereby reducing the introduction stroke of the secondary air and achieving better combustion effect.

[0080] In addition, the third air guide plate 209 of the gas distribution disc 202 of the combustor is arranged outside the outer ring gas mixing chamber, and the third air guide plate 209 is provided with a plurality of third air guide holes 210, so that, during use of the gas stove, secondary air can be introduced into the outer ring fire cover 204 of the combustor through the plurality of third air guide holes 210 on the third air guide plate 209 to increase the amount of secondary air supplied to the outer ring fire cover 204 of the combustor; in addition, the outlet ends of the fire holes of the outer ring fire cover 204 are arranged to face the outer ring of the outer ring fire cover 204, that is, the secondary air introduced into the outer ring fire cover 204 of the combustor through the plurality of second air guide holes 210 can be directly combined with the gas output from the outlet ends of the fire holes of the outer ring fire cover 204, thereby reducing the introduction stroke of the secondary air and achieving better combustion effect.

[0081] In addition, the plurality of second air guide holes 208 and the plurality of third air guide holes 210 on the gas distribution disc of the embodiment of the application are located in the second through hole 106 of the sealing chamber 102 in the projection of the cover body 101 shown in Embodiment 1, that is, the plurality of second air guide holes 208 and the plurality of third air guide holes 209 of the embodiment of the application are part of the above-mentioned secondary air ventilation holes, so that the air introduced into the sealing chamber 102 by the fan 103 can be actively introduced into the inner ring fire cover 203 and the outer ring fire cover 204 through the plurality of second air guide holes 208 and the plurality of third air guide holes 210, the secondary air supply effect is better, and the combustor also has better combustion effect.

[0082] In combination Figures 5-10 In addition, the gas distribution disc of the embodiment of the application further comprises a first air guide plate 205, the first air guide plate 205 is arranged inside the inner ring of the inner ring gas mixing chamber of the gas distribution disc 202, the first air guide plate 205 is provided with a plurality of first air guide holes 206, and secondary air can be introduced into the fire holes of the inner ring fire cover 203 through the plurality of first air guide holes 206 on the first air guide plate 205 to improve the combustion efficiency of the inner ring fire cover 203 of the combustor.

[0083] Further, in combination with Figures 5-10 In the embodiment of the present application, the first air guide plate 205 is arranged below the inner ring of the inner ring fire cover 203, and correspondingly, the projection of the plurality of first air guide holes 206 on the cover body 102 shown in Embodiment I is also located in the second through hole 106 of the sealed chamber 102, that is, the plurality of first air guide holes 206 in the embodiment of the present application are part of the above-mentioned secondary air ventilation holes, so that the air introduced into the sealed chamber 102 by the fan 103 can be actively introduced into the inner ring fire cover 203 through the plurality of first air guide holes 206, the secondary air supplement effect is better, and the burner also has better combustion effect.

[0084] In combination with Figures 5-10 In the embodiment of the present application, the top surface of the gas distribution disc 202 is coaxially provided with a first ring sleeve 211, the first air guide plate 205 is arranged on the top of the first ring sleeve 211, and the projection of the plurality of first air guide holes 206 on the gas distribution disc 202 is located in the projection of the first ring sleeve 211 on the gas distribution disc. The secondary air can be introduced into the inner ring fire cover 203 through the first ring sleeve 211 and the plurality of first air guide holes 206 on the first air guide plate 205, the secondary air supplement effect is better, and the burner also has better combustion effect.

[0085] The projection of the first ring sleeve 211 in the embodiment of the present application on the cover body 101 in Embodiment I is located in the second through hole 106 of the cover body 101, so that the air introduced into the sealed chamber 102 by the fan 103 can be actively introduced into the inner ring fire cover 203 through the first ring sleeve 211 and the plurality of first air guide holes 206, and the plurality of first air guide holes 206 can be arranged in a ring shape and spaced apart, so that the secondary air supplement effect is more balanced, and the burner also has better combustion effect.

[0086] The gas distribution disc 202 in the embodiment of the present application can further include a second ring sleeve 212 arranged coaxially, the first air guide plate 205 is fixedly arranged at the middle portion inside the second ring sleeve 212, the lower portion of the second ring sleeve 212 is detachably arranged on the outer circumferential surface of the top portion of the first ring sleeve 211, and the inner ring of the inner ring fire cover 203 is detachably arranged on the top portion of the second ring sleeve 212.

[0087] Specifically, in combination with Figures 5-10 The second ring sleeve 212 in the embodiment of the present application can be sleeved on the outer circumferential surface of the top portion of the first ring sleeve 211 in a clearance fit manner, and the detachable arrangement of the second ring sleeve 212 relative to the first ring sleeve 211 can be realized through the limiting of the first air guide plate 205. The inner ring of the inner ring fire cover 203 can be directly arranged on the top portion of the second ring sleeve 212, and when in use, the gravity of the inner ring fire cover 203 can realize the assembly of the inner ring of the inner ring fire cover 203 on the top portion of the second ring sleeve 212.

[0088] In other embodiments, a notch can also be formed at the bottom of the sidewall of the inner ring of the inner ring fire cover 203, and the bottom notch of the inner ring of the inner ring fire cover 203 can be lapped on the top of the second ring sleeve 212; or a slot can also be formed at the bottom of the sidewall of the inner ring of the inner ring fire cover 203, and the top of the second ring sleeve 212 can be inserted into the slot of the inner ring of the inner ring fire cover 203, so that the inner ring of the inner ring fire cover 203 can be detachably assembled on the top of the second ring sleeve 212, and the present application embodiments do not make specific limitations on this.

[0089] The burner of the present application embodiment further comprises a first air guide, Figure 11 Figure 7 The structure diagram of the first air guide in the Figures 5-11 The first air guide comprises a third ring sleeve 213 and a cover plate 214, wherein the third ring sleeve 213 is fitted into the inner circumference of the second ring sleeve 212, and the cover plate 214 is arranged above the third ring sleeve 213. The cover plate 214 and the top of the third ring sleeve 213 are connected by a plurality of first connecting columns 215 arranged at intervals, and the cover plate 214 is supported on the top of the outer ring of the inner ring fire cover 203 by a plurality of second connecting columns 216 arranged at intervals. The secondary air introduced from the plurality of first air guide holes 20 can be guided by the second ring sleeve 212, the third ring sleeve 213 and the cover plate 214, and introduced into the fire hole of the inner ring fire cover 203 at the fire outlet end in sequence through the gaps between the plurality of first connecting columns 215 and the gaps between the plurality of second connecting columns 216, for the combustion of the fire hole of the inner ring fire cover 203, so that the secondary air introduced from the first air inlet hole 206 can be guided to the fire outlet end of the fire hole of the inner ring fire cover 203, so as to further improve the combustion effect of the inner ring fire cover 203.

[0090] Figure 12 The top view structure diagram of the inner ring fire cover in the Figure 7 Figures 5-12 ​​In the embodiment, the inner ring fire cover 203 is coaxially provided with a connecting ring 233, the connecting ring 233 and the inner ring of the inner ring fire cover 203 are connected through a sealing ring 217, the outer circumferential surface of the third ring 213 is gap-fitted in the connecting ring 233, the outer circumferential surface of the inner ring of the inner ring fire cover 203 is fixedly provided with the sealing ring 217, the sealing ring 217 is interference-fitted in the inner circumferential surface of the second ring 212, the plurality of first connecting columns 215 and the plurality of second connecting columns 216 are equally angularly spaced around the central axis of the inner ring fire cover 203, and the plurality of first connecting columns 215 and the plurality of second connecting columns 216 are fixedly arranged on the top surface of the inner ring fire cover 203, the plurality of first connecting columns 215 are fixed on the bottom surface of the cover plate 214, the plurality of first connecting columns 215 and the third ring 213 are separately arranged, the plurality of second connecting columns 216 are fixed on the top surface of the outer ring of the inner ring fire cover 203, and the plurality of second connecting columns 216 and the cover plate 214 are separately arranged. When the gas stove is used, the cover plate 214 is supported on the plurality of first connecting columns 215 and the plurality of second connecting columns 217 by gravity.

[0091] In other embodiments, the outer circumferential surface of the third ring 213 can also be directly interference-fitted in the inner circumferential surface of the second ring 212, the third ring 213, the plurality of first connecting columns 215 and the cover plate 214 can be fixedly connected as a whole, and the cover plate 214, the plurality of second connecting columns 216 and the inner ring fire cover 213 can also be connected as a whole. The application can be adaptively limited according to specific conditions, and the embodiment will not be repeated here.

[0092] In the embodiment, the first ring 211, the second ring 212 and the third ring 213 are coaxially and continuously arranged, which can guide the introduction of the secondary air introduced from the plurality of first air inlets 206, prevent the secondary air from being turbulent, improve the uniformity of the secondary air distribution, and further improve the combustion effect of the inner ring fire cover 203.

[0093] In combination Figures 5-10 In the embodiment, the top surface of the gas distribution disc 202 is coaxially provided with a fourth ring 218 and a fifth ring 219, the fourth ring 218 and the fifth ring 219 are coaxially arranged outside the first ring 211 in sequence, the area surrounded by the fourth ring 218 and the first ring 211 is the inner mixing chamber of the gas distribution disc 202, the second air inlet plate 207 is separately arranged on the top of the fourth ring 218 and the fifth ring 219, the plurality of second air inlets 208 are located between the projections of the fourth ring 218 and the fifth ring 219 on the gas distribution disc 202, and the plurality of second air inlets 210 are also preferably arranged in a ring shape.

[0094] Further, in combination Figures 5-10The gas distribution disc 202 further comprises a sixth sleeve 220 and a seventh sleeve 221, the sixth sleeve 220 and the seventh sleeve 221 are connected by the second air guide plate 207, the lower part of the sixth sleeve 220 is detachably arranged on the inner circumferential surface of the top of the fourth sleeve 218, the lower part of the seventh sleeve 221 is detachably arranged on the inner circumferential surface of the top of the fifth sleeve 219, and the outer circumferential surface of the seventh sleeve 221 is provided with a first supporting plate 222 supported on the top of the fifth sleeve 219, so that the assembly of the second air guide plate 209 on the gas distribution disc 202 is realized.

[0095] Specifically, in combination with Figures 5-10 In the embodiment, the sixth sleeve 220 is arranged in a gap fit manner on the inner side of the top of the fourth sleeve 218, and the seventh sleeve 221 is arranged in a gap fit manner on the inner side of the top of the fifth sleeve 219. Of course, the sixth sleeve 220 and the fourth sleeve 218, and the seventh sleeve 221 and the fifth sleeve 219 can also be detachably connected in a plug-in manner, and the embodiment does not make specific limitations on this.

[0096] The bottom of the outer ring of the inner ring fire cover 203 is detachably arranged on the top of the sixth sleeve 220, and the bottom of the inner ring of the outer ring fire cover 204 is detachably arranged on the top of the seventh sleeve 221. As for the assembly mode of the bottom of the outer ring of the inner ring fire cover 203 on the top of the sixth sleeve 220 and the assembly mode of the bottom of the inner ring of the outer ring fire cover 204 on the top of the seventh sleeve 221, the assembly mode of the bottom of the inner ring of the inner ring fire cover 203 on the second sleeve 212 can be referred to, and the embodiment does not make too much repetition.

[0097] In the embodiment, the secondary air introduced through the plurality of second air inlets 208 flows between the fourth sleeve 218 and the fifth sleeve 219 and between the sixth sleeve 220 and the seventh sleeve 221 in sequence, so that the introduction of the secondary air can be guided to prevent the introduced secondary air from being turbulent, so that the burner has a better combustion effect.

[0098] Further, in combination with Figures 5-10 In the embodiment, the first connecting plate 223 is arranged between the first sleeve 211 and the fourth sleeve 218, the first connecting plate 223 is provided with a first opening in communication with the inner ring ejection pipe, the second connecting plate 224 is arranged between the sixth sleeve 220 and the second sleeve 212, the second connecting plate 224 is provided with a second opening in communication with the first opening, the inner ring of the inner ring fire cover 203 and the outer ring are supported by the second sleeve 212 and the sixth sleeve 220 respectively, the primary air and the fuel injected from the inner ring ejection pipe can be injected into the fire hole of the inner ring fire cover 203 through the first opening and the second opening, so as to serve the generation of the flame of the inner ring fire cover 203.

[0099] In combination Figures 5-10 , the top surface of the gas distribution disc 202 is further provided with a coaxial eighth ring sleeve 225, the eighth ring sleeve 225 is arranged outside the fifth ring sleeve 219, and the area surrounded by the eighth ring sleeve 225 and the fifth ring sleeve 219 is the outer ring gas mixing chamber. The third air guide plate 209 is fixedly arranged on the outer circumferential surface of the eighth ring sleeve 225.

[0100] Specifically, in combination Figures 5-10 , in the embodiment, the third air guide plate 209 is integrally formed on the outer circumferential surface of the eighth ring sleeve 225, and the plurality of third air guide holes 210 on the third air guide plate 209 are arranged in a ring shape. The projection of the plurality of third air guide holes 210 on the third air guide plate 209 on the cover body 101 of the first embodiment falls within the second through hole 106 on the cover body 101. Thus, the air introduced into the sealed chamber 203 by the fan 103 can be actively introduced into the outer ring flame cover 204 through the plurality of third air guide holes 210, so that the secondary air supplementing effect is better, and the burner has better combustion effect.

[0101] In combination Figures 5-10 , the gas distribution disc 202 of the embodiment further comprises a ninth ring sleeve 226, the bottom of the ninth ring sleeve 226 is detachably arranged on the top of the eighth ring sleeve 225, and the bottom of the outer ring of the outer ring flame cover 204 is detachably arranged on the top of the ninth ring sleeve 225.

[0102] Further, in combination Figures 5-10 , in the embodiment, the lower part of the ninth ring sleeve 226 is clearance-fitted in the inner circumferential surface of the eighth ring sleeve 225, and the middle part of the outer circumferential surface of the ninth ring sleeve 226 is fixedly provided with a second support plate 227, and the second support plate 227 is lapped on the top of the eighth ring sleeve 225, so as to realize the detachable assembly of the ninth ring sleeve 226 and the eighth ring sleeve 225. As for the assembly mode of the bottom of the outer ring of the outer ring flame cover 204 on the top of the ninth ring sleeve 226, the assembly mode of the bottom of the inner ring of the inner ring flame cover 203 on the second ring sleeve 212 can be referred to, and the embodiment will not be described in detail.

[0103] Further, the burner of the embodiment further comprises a second air guide member, Figure 13 for Figure 7 the structural schematic view of the second air guide member in the embodiment, in combination Figure 13The second air guide member includes a tenth sleeve 228, the bottom of the tenth sleeve 228 is detachably arranged on the top surface of the third air guide plate 209, the tenth sleeve 228 is arranged in the gap between the eighth sleeve 228 and the ninth sleeve 226, and a plurality of third air guide holes 210 are arranged between the eighth sleeve 228 and the tenth sleeve 228. In this way, the secondary air introduced from the plurality of third air guide holes 210 can be introduced into the fire hole of the outer ring fire cover 204 through the gap between the eighth sleeve 228, the ninth sleeve 228 and the tenth sleeve 228, that is, the arrangement can guide the secondary air introduced from the plurality of third air guide holes 210, prevent the secondary air from being turbulent, and further improve the combustion effect of the burner.

[0104] Further, in combination with Figures 5-9 and Figure 13 , the top surface of the third air guide plate 209 of the embodiment is provided with a limiting ring 229 in the form of a ring, the limiting ring 229 is arranged outside the plurality of third air guide holes 210, and the bottom of the tenth sleeve 228 is detachably arranged on the outer circumferential surface of the limiting ring 229, so that the positioning of the tenth sleeve 228 on the top surface of the third air guide plate 209 can be realized.

[0105] In addition, in combination with Figure 13 , in the embodiment, the inner diameter of the tenth sleeve 228 located above the second support plate 227 is reduced, so that the distance between the tenth sleeve 228 located above the second support plate 227 and the ninth sleeve 226 is reduced, so that the secondary air introduced from the plurality of third air guide holes 210 can be prevented from diffusing during the introduction process, so as to further prevent the secondary air from being turbulent, and further improve the combustion effect of the burner.

[0106] In addition, in combination with Figures 5-10 , in the embodiment, a third connecting plate 230 is arranged between the fifth sleeve 219 and the eighth sleeve 225, the third connecting plate 230 is provided with a third opening which is in communication with the outer ring ejection pipe, and a fourth connecting plate 231 is arranged between the seventh sleeve 221 and the ninth sleeve 226, the first support plate 222 is part of the fourth connecting plate 231, and the fourth connecting plate 231 is provided with a fourth opening which is in communication with the third opening. The inner ring and the outer ring of the outer ring fire cover 204 are respectively supported by the seventh sleeve 221 and the ninth sleeve 226, and the primary air and the fuel injected from the outer ring ejection pipe can be injected into the fire hole of the outer ring fire cover 204 through the third opening and the fourth opening, so as to serve the generation of the flame of the outer ring fire cover.

[0107] In combination with Figure 9In order to facilitate the assembly and transportation of the burner, in the embodiment of the application, the fifth ring sleeve 219 and the fourth ring sleeve 218 can be connected through the fifth connecting plate 232, the fifth connecting plate 232 is provided with a fifth opening for the secondary air to pass through, the first ring sleeve 211, the first connecting plate 223, the fourth ring sleeve 218, the fifth connecting plate 232, the fifth ring sleeve 219, the third connecting plate 230, the eighth ring sleeve 225, the third air guide plate 209 and the limiting stop ring 229 can be integrally formed to form a first assembly body, and the first air guide plate 205, the second ring sleeve 212, the second connecting plate 224, the sixth ring sleeve 220, the second air guide plate 207, the seventh ring sleeve 221, the fourth connecting plate 231, the ninth ring sleeve 226 and the second supporting plate 227 can be integrally formed to form a second assembly body.

[0108] In summary, the gas stove provided by the embodiment of the application realizes the active supply of secondary air of the gas stove by ventilating the sealed cavity in the stove shell of the gas stove through the fan, at the same time, the stove shell

[0109] In the prior art, for the burner with an energy-gathering disc, the smoke outlet is generally higher than 8 mm, otherwise, the secondary air supply will be insufficient, and the flue gas will be increased. However, by using the secondary air supply mode of the embodiment of the application, the smoke outlet can be reduced to about 5 mm, and sufficient secondary air supply can still be ensured, and complete combustion can be ensured. That is, the embodiment of the application can enable the gas stove to still fully combust the gas under the condition that the secondary air supply is difficult, and has good practical value.

[0110] In the present application, unless specifically defined and limited otherwise, the terms "connection", "fixing", and the like should be understood in a broad sense, for example, "fixing" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0111] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0112] In addition, the terms "first", "second", and the like in the description do not necessarily imply that the corresponding features are of any particular importance, or that the corresponding features are of any particular order. Thus, a feature defined with "first", "second" can include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the fact that the technical solutions can be realized by those skilled in the art. When the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope of the present application.

[0113] In the description of the present application, unless otherwise explicitly specified and limited, "on" or "under" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "over" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. "Under", "below" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0114] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the specification.

[0115] Although the preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications to the embodiments once they know the basic inventive concept. Therefore, the appended claims are intended to include the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0116] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application also intends to include these modifications and variations.

Claims

1. A burner, characterized in that: The burner includes a gas distribution plate, an inner ring fire cover and an outer ring fire cover, wherein: The air distribution plate includes a second air induction plate and a third air induction plate, wherein the second air induction plate is arranged between the inner ring air mixing chamber and the outer ring air mixing chamber of the air distribution plate, and a plurality of second air induction holes are arranged on the second air induction plate, and the third air induction plate is arranged outside the outer ring air mixing chamber of the air distribution plate, and a plurality of third air induction holes are arranged on the third air induction plate; The fire outlet end of the fire hole of the inner ring fire cover is arranged to face the outer ring of the inner ring fire cover, and the fire outlet end of the fire hole of the outer ring fire cover is arranged to face the outer ring of the outer ring fire cover; The gas distribution plate further includes a first air induction plate, which is arranged inside the inner ring of the inner ring gas mixing chamber of the gas distribution plate, and has a plurality of first air induction holes arranged on the first air induction plate; A first annular sleeve is coaxially arranged on the top surface of the air distribution plate, the first air induction plate is arranged on the top of the first annular sleeve, and the projections of the plurality of first air induction holes on the air distribution plate are located within the projections of the first annular sleeve on the air distribution plate; The gas distribution plate also includes a coaxially arranged second ring sleeve, the first air induced plate is fixedly arranged in the middle part of the interior of the second ring sleeve, the lower part of the second ring sleeve is detachably arranged on the outer peripheral surface of the top of the first ring sleeve, and the bottom of the inner ring of the inner ring fire cover is detachably arranged on the top of the second ring sleeve.

2. The burner according to claim 1, characterized in that The burner further includes a first air guide member, which includes a third ring sleeve and a cover plate, wherein: The third ring sleeve is fitted within the inner circumference of the second ring sleeve, the cover plate is arranged above the third ring sleeve, the cover plate and the top of the third ring sleeve are connected by a plurality of first connecting columns arranged at intervals, and the cover plate is supported on the top of the outer ring of the inner ring fire cover by a plurality of second connecting columns arranged at intervals.

3. The burner according to claim 1, characterized in that A fourth ring sleeve and a fifth ring sleeve are coaxially arranged on the top surface of the gas distribution plate, and the fourth ring sleeve and the fifth ring sleeve are coaxially arranged on the outside of the first ring sleeve in sequence; The second air induction plate is detachably arranged on the top of the fourth ring sleeve and the fifth ring sleeve, and the projections of the plurality of second air induction holes on the air distribution plate are located between the projections of the fourth ring sleeve and the fifth ring sleeve on the air distribution plate.

4. The burner according to claim 3, characterized in that The gas distribution plate also includes a sixth ring sleeve and a seventh ring sleeve, the interiors of the sixth ring sleeve and the seventh ring sleeve are connected by the second air induction plate, the lower portion of the sixth ring sleeve is detachably arranged on the inner circumferential surface of the top of the fourth ring sleeve, the lower portion of the seventh ring sleeve is detachably arranged on the inner circumferential surface of the top of the fifth ring sleeve, and the outer circumferential surface of the seventh ring sleeve is provided with a first support plate supported on the top of the fifth ring sleeve; The bottom of the outer ring of the inner ring fire cover can be detachably arranged on the top of the sixth ring sleeve, and the bottom of the inner ring of the outer ring fire cover can be detachably arranged on the top of the seventh ring sleeve.

5. The burner according to claim 3, characterized in that The top surface of the gas distribution plate is further provided with a coaxial eighth ring sleeve, the eighth ring sleeve is arranged on the outside of the fifth ring sleeve, and the third air induction plate is fixedly arranged on the outer peripheral surface of the eighth ring sleeve; The gas distribution plate further includes a ninth ring sleeve, the bottom of which is detachably arranged on the top of the eighth ring sleeve, and the bottom of the outer ring of the outer ring fire cover is detachably arranged on the top of the ninth ring sleeve.

6. The burner according to claim 5, characterized in that The burner also includes a second air guide member, which includes a tenth ring sleeve. The bottom of the tenth ring sleeve can be detachably arranged on the top surface of the third air induction plate. The tenth ring sleeve gap is arranged on the outer side of the eighth ring sleeve and the ninth ring sleeve, and a plurality of the third air induction holes are arranged between the tenth ring sleeve and the eighth ring sleeve.

7. The burner according to claim 6, characterized in that An annular limit stop ring is provided on the top surface of the third air induction plate, and the limit stop ring is provided on the outside of the plurality of third air induction plates. The bottom of the tenth ring sleeve is detachably provided on the outer peripheral surface of the limit stop ring.

8. A gas stove, characterized in that: The gas stove comprises: cover body; The burner according to any one of claims 1 to 7 is assembled on the cover.

9. The gas stove according to claim 8, characterized in that: The gas stove also includes: A sealed chamber is provided in the cover body, and a side wall of the sealed chamber is provided with an air inlet, a first through hole for the inlet end of the burner head of the burner to pass through, and a second through hole for the outlet end of the burner head to pass through; a fan disposed in the sealed chamber and capable of introducing supplementary secondary air into the sealed chamber through the air inlet; The gas distribution plate of the burner covers the second through hole of the sealed chamber, and the projections of the multiple second air induction holes on the gas distribution plate and the multiple third air induction holes on the cover body are all located in the second through hole of the sealed chamber.

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