Energy-gathering hood for stove and gas stove using the energy-gathering hood for stove

Abstract

The present invention relates to an energy-gathering hood for a stove and a gas stove using the energy-gathering hood for a stove. The energy-gathering hood comprises an annular hood body, a annular cavity is formed in the center of the hood body, and the energy-gathering hood comprises an outer hood located at the periphery of the hood body, a first cavity between the outer hood and the hood body is connected with the annular cavity and the outside, and serves as a first air-supplementing cavity, the outer hood has a first air inlet connected with the first air-supplementing cavity, and the gas stove also comprises a bottom plate located under the outer hood, a second cavity between the bottom plate and the outer hood is connected with the annular cavity and the outside, and serves as a second air-supplementing cavity. Compared with the prior art, the advantage of the present invention is that the outer hood and the bottom plate can form a "partition" of the energy-gathering hood for a stove, and secondary air passes through the separation effect of the outer hood and the bottom plate, so that both the inner and outer rings can be fully burned. The present invention also provides a gas stove using the above energy-gathering hood for a stove, which can avoid the secondary air between the inner ring and the outer ring from influencing each other, thereby realizing efficient combustion of the inner ring fire cover.

Description

Technical Field

[0001] The invention relates to an energy-gathering hood for a stove, and also relates to a gas stove using the energy-gathering hood for a stove. Background Art

[0002] In actual use of existing gas stoves, since the pot is placed on a pot support for heating, there is a certain space between the pot and the burner. In this way, in addition to being used to heat the pot, a considerable portion of the heat energy generated by the combustion of the gas escapes into the surrounding environment, causing energy waste. In order to solve the above-mentioned problem, some heat-collecting and energy-gathering structures have appeared in China in recent years, such as the Chinese utility model ZL201721665758.2 (CN207962760U) applied by the applicant, "An energy-gathering cover for a gas stove and a stove using the energy-gathering cover for a gas stove", which discloses a ring-shaped cover body, characterized in that: the cover body is a double-layer structure composed of an upper cover and a lower cover, and the bottom of the lower cover has a concave and convex The structure forms a convex rib protruding downward. On the basis of the existing gas stove, an energy-gathering hood for the gas stove is additionally provided. The hood body is a double-layer structure consisting of an upper hood and a lower hood. The bottom of the lower hood has a concave-convex structure to form a convex rib protruding downward. The concave-convex structure is used to separate the bottom of the lower hood into a channel for preheating secondary air, thereby promoting gas combustion and improving gas utilization. The upper hood and the lower hood are closed and connected. The air therein does not flow, which blocks the heat transfer from the upper hood to the lower hood. However, the lower hood is generally placed on the panel or liquid tray of the gas stove. The heat accumulated during the combustion of the burner is also easily transferred to the panel or the liquid tray, which not only easily causes the temperature rise problem of the panel, but also fails to fully recycle and utilize the heat accumulated by the upper hood.

[0003] In addition, since the primary air coefficient of the existing atmospheric burner is generally 0.4-0.7, the premixed air cannot reach the air volume required by the complete burner. In addition to various factors, a certain secondary air coefficient supplement is required, and in order to reduce CO emissions, the secondary air coefficient supplement should be as sufficient as possible. At present, there are various ways to supplement air for stove burners, generally including side air intake and bottom air intake. The side air intake method is to open a side air inlet on the side of the mixing chamber, and the external air is supplemented by the side air inlet. The bottom air intake method is to open a bottom air inlet on the base, and the air under the stove is supplemented by the bottom air inlet. Among them, although the side air intake method has the advantages of small air intake resistance and large air intake volume, the existing side air intake burners still have problems such as: First, the inner ring area of ​​the fire cover requires a large amount of secondary air. When the secondary air flows into the gap, it is easy to be disturbed by the hot air flow after combustion and the suction interference of the outer ring fire holes on the secondary air. In the case of insufficient secondary air inflow, the combustion is incomplete and the exhaust gas emission is high; Second, the secondary air replenishment method of the side air intake of the existing burner is mainly for the inner ring area, and if an energy gathering ring is added outside the burner, it is easy to block the secondary air replenishment of the outer ring fire holes in the outer ring area, especially for the secondary air replenishment of the inner ring fire in the outer ring area with inner and outer double ring fires. In order to improve the thermal efficiency of the inner and outer ring areas of the fire cover, further improvements are needed. Summary of the invention

[0004] The first technical problem to be solved by the present invention is to provide a stove energy-gathering hood that can ensure that an appropriate amount of lateral secondary air is provided to the burner in response to the above-mentioned existing technical status.

[0005] The second technical problem to be solved by the present invention is to provide a stove energy collecting hood which can reduce downward heat conduction loss in response to the above-mentioned existing technical status.

[0006] The third technical problem to be solved by the present invention is to provide an energy-gathering hood for a stove that can avoid the influence of overflow in view of the above-mentioned existing technical status.

[0007] The fourth technical problem to be solved by the present invention is to provide a gas stove capable of reasonably distributing the secondary air entering through the side of the stove energy collecting hood in view of the above-mentioned existing technical status.

[0008] In order to solve the first technical problem mentioned above, the technical solution adopted by the present invention is: the energy-concentrating hood for the stove includes an annular hood body, an annular cavity is formed in the center of the hood body, and is characterized in that: it also includes an outer hood located outside the hood body, a first cavity between the outer hood and the hood body connects the annular cavity with the outside world and serves as a first air supply cavity, the outer hood has a first air inlet connected to the first air supply cavity, and also includes a bottom plate located under the outer hood, a second cavity between the bottom plate and the outer hood connects the annular cavity with the outside world and serves as a second air supply cavity.

[0009] In order to achieve that the secondary air can be slowly reduced along with the supply direction of the secondary air supply when passing through the first air supply cavity, and gradually preheated at the same time, preferably, a partition is also provided in the first air supply cavity, and the edge of the peripheral edge of the partition abuts against the bottom wall of the cover body to divide the first air supply cavity into at least two sub-cavities, and each of the sub-cavities is fluidically connected with the first air inlet. Separating each sub-cavity by a partition has the following advantages: First, the first cavity of the first air supply cavity is divided into a plurality of relatively independent closed sub-cavities, so as to effectively reduce the convective heat exchange of the air in the first cavity, and also reduce the convective heat exchange between the air in the first cavity and the air outside the first cavity, further improving the heat insulation property of the heat insulation cover; second, after the secondary air passes through a plurality of sub-cavities, the amount of secondary air that finally flows into the sub-annular cavity is reduced; third, due to the enhanced heat insulation property of the heat insulation cover, the secondary air that finally flows into the sub-annular cavity can be more easily fully preheated, thereby improving the gas utilization rate.

[0010] In order to better enable the secondary air to gradually flow into each sub-cavity along the flow direction of the airflow, so that the secondary air can slowly decrease along the supply direction of the secondary air supply when passing through the first air replenishment cavity, and gradually preheat at the same time, preferably, along the flow direction of the airflow of the first air inlet, the bottom of the adjacent sub-cavities gradually tilts upward from the outside to the inside.

[0011] From the perspective of structural simplicity, the partition is preferably provided with a first partition plate and a second partition plate which are arranged from the inside to the outside and at intervals in the radial direction, so as to divide the first air replenishment chamber into a first sub-cavity adjacent to the annular chamber, a second sub-cavity away from the annular chamber, and a third sub-cavity located between the first sub-cavity and the second sub-cavity, wherein the first partition plate includes a first vertical portion and a first transverse portion, the first vertical portion abuts against the bottom wall of the cover body, and the first transverse portion has a first interval with the bottom wall of the cover body, thereby constituting a first air outlet for replenishing air to the annular chamber; the first transverse portion is provided with at least two through holes which are fluidically connected with the third sub-cavity at intervals along the circumferential direction, and correspondingly, the second partition plate includes a second vertical portion and a second transverse portion, the second vertical portion abuts against the bottom wall of the cover body, and the second transverse portion has a second interval with the bottom wall of the cover body, and there is a third interval between the second transverse portion and the first vertical portion, and the secondary air in the second sub-cavity at least partially enters the third sub-cavity through the third interval and then flows into the first sub-cavity.

[0012] In order to slowly reduce the secondary air entering the second sub-cavity, preferably, the cross-sectional area of ​​the second sub-cavity gradually decreases along the flow direction of the secondary air.

[0013] In order to solve the second technical problem and reduce the heat conduction loss downward from the energy-gathering hood for the stove, preferably, the hood body includes an upper hood and a lower hood that are matched to each other, and a third cavity is formed between the upper hood and the lower hood, and the upper hood and the lower hood have an annular seam along the circumferential direction at the junction of the inner periphery or / and the outer periphery, which is used to connect the third cavity with the outside. The third cavity of this solution is not only an open cavity, which can make the air in the third cavity flow slightly, but also can reduce the heat accumulated in the upper hood during the combustion process and conduct it to the lower hood. In order to meet the requirement that the annular seam has enough static air layer thickness to insulate and avoid the convective heat exchange loss caused by the large air flow, the annular seam must be no more than 2mm, which can reduce the contact area between the two layers, reduce the contact heat transfer loss, and ensure the small flow of air between the two layers.

[0014] In order to prevent overflow from entering the annular seam, preferably, the upper cover has an inner end edge adjacent to the annular cavity, the lower cover has an inner end edge adjacent to the annular cavity, the inner end edge of the upper cover extends downward with an inner turndown, and the inner turndown can at least partially block the inner end edge, and the lower end of the annular wall and the inner end edge of the lower cover have a fourth gap, and the fourth gap constitutes an annular seam connecting the third cavity and the outside world.

[0015] To solve the third technical problem, preferably, the upper cover has a partition protruding from its upper surface, and the partition divides the upper cover into an energy gathering area located on the inner side and a liquid storage area located on the outer side. The liquid storage area allows the overflow generated during the cooking process to be stored in the liquid storage area, thereby preventing the overflow from clogging the fire hole.

[0016] In order to better achieve the energy gathering effect of the energy gathering hood for stoves, further, the energy gathering area is sunken more than the liquid storage area.

[0017] In order to better achieve the air replenishment effect of the second air replenishment cavity, preferably, the bottom plate is inclined from inside to outside, wherein the inner edge of the bottom plate corresponds to the middle of the first transverse part of the first sub-cavity, and gradually tilts upward from outside to inside to form the guide edge of the second air replenishment cavity. The air replenishment path of the first air replenishment cavity is a channel, wherein the secondary air first enters from the first air inlet, and then passes through the second sub-cavity with a gradually decreasing cross-sectional area, the secondary air slowly decreases, and gradually preheats; after reaching the bottom plate, it goes inward, passes through the third sub-cavity and the first sub-cavity, wherein the third sub-cavity serves as the retention area of ​​the first air replenishment cavity, and the retention area makes the retention time of the secondary air here longer, thereby strengthening the retention time of the secondary air, further preheating, and finally passing through the through hole of the first transverse part so that the fully preheated secondary air can flow into the first sub-cavity better; on the contrary, the overflow in the cooking process passes through the first sub-cavity, the third sub-cavity and the second sub-cavity and gradually flows out to the outer cover, and the setting of the guide edge can prevent the overflow from continuing to flow inward.

[0018] Furthermore, the lower cover has at least three recesses on the bottom wall corresponding to the third cavity to form legs, and the second air inlet of the second air replenishing cavity is formed between adjacent legs. The setting of the legs can avoid thermal contact between the outer cover and the panel or the liquid receiving pan, so as to further reduce downward heat conduction loss.

[0019] To solve the fourth technical problem, the present invention further provides a gas stove using the above-mentioned stove energy-gathering cover, comprising a panel and a burner, wherein the cover body is arranged on the panel and surrounds the burner, and the burner comprises:

[0020] Pedestal;

[0021] An inner ring fire cover is arranged on the base and forms a central gas mixing chamber between the inner ring fire cover and the base;

[0022] The outer ring fire cover is also arranged on the base, located at the periphery of the inner ring fire cover, and forms an outer ring gas mixing chamber between the outer ring fire cover and the base;

[0023] External fire holes are arranged on the outer ring wall of the outer ring fire cover at intervals along the circumferential direction;

[0024] The feature is that the first transverse portion of the first air supplement cavity abuts against the area below the first outer ring portion of the outer ring wall. The first transverse portion of the first air supplement cavity also has the function of separating the first air supplement cavity from the second air supplement cavity. The secondary air is forced to be diverted through the first transverse portion, so that both the inner and outer rings can fully burn. It is particularly suitable for an outer ring fire cover with two ring fires. The first transverse portion of the first air supplement cavity abuts against the area below the first outer ring portion of the outer ring wall, which can avoid the secondary air between the inner ring and the outer ring from influencing each other, has accurate positioning, and improves the gas combustion efficiency. At the same time, the first transverse portion can recycle the heat of the mixing chamber, which can preheat the secondary air and help improve the thermal efficiency of the burner.

[0025] Compared with the prior art, the advantages of the present invention are: the outer cover and the bottom plate can form a "partition" of the energy-gathering cover for the stove. The secondary air passes through the separation effect of the outer cover and the bottom plate to form two independent first air-supplementing chambers and second air-supplementing chambers, which effectively avoids the irrational distribution of secondary air such as excess secondary air in the inner ring and insufficient secondary air in the outer ring. The secondary air is forced to be diverted through the outer cover and the bottom plate, so that both the inner and outer rings can burn fully. The present invention also provides a gas stove using the above-mentioned energy-gathering cover for the stove. The first transverse portion of the first air-supplementing chamber is abutted against the area under the first outer ring portion of the outer ring wall, which can avoid mutual influence of secondary air between the inner ring and the outer ring, thereby realizing efficient combustion of the inner ring fire cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the front structure of the energy-gathering cover for a stove in an embodiment of the present invention;

[0027] Figure 2 for Figure 1 A cross-sectional view of

[0028] Figure 3 is a cross-sectional view of another angle of the energy-gathering cover for a stove in an embodiment of the present invention;

[0029] Figure 4 It is a schematic structural diagram of an upper cover in an energy-gathering cover for a gas stove in an embodiment of the present invention;

[0030] Figure 5 The figure is a schematic diagram of the structure of the lower cover in the energy-gathering cover for the gas stove in the embodiment of the present invention. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below with reference to the accompanying drawings.

[0032] like Figures 1 to 5As shown, it is the best embodiment of the present invention. The energy-gathering cover for the stove in this embodiment includes a cover body 1 surrounded by a central hole 10, and the cover body 1 includes an upper cover 11 and a lower cover 12 that are mutually matched, and a cavity 13 is formed between the upper cover 11 and the lower cover 12, and the upper cover 11 and the lower cover 12 have an annular seam along the circumferential direction at the junction of the inner periphery or the outer periphery, which is used to connect the cavity 13 with the outside. The energy-gathering cover for the gas stove is an open cavity 13, which can make the air in the cavity 13 flow slightly, and can reduce the heat accumulated in the upper cover 11 during the combustion process to be transferred to the lower cover 12. In order to meet the requirement that the annular seam has enough static air layer thickness for heat insulation and avoid the convective heat exchange loss caused by large air flow, it can also reduce the contact area between the two layers, reduce the contact heat transfer loss, and ensure the small flow of air between the two layers, and preheat the air entering through the annular seam.

[0033] In order to reduce heat conduction between the upper cover 11 and the lower cover 12, preferably, the upper cover 11 has an inner end edge 111 adjacent to the central hole 10, and the lower cover 12 has an inner end edge 121 adjacent to the central hole 10, and the inner end edge 111 of the upper cover 11 extends downwardly with an inner flange 1111 that can at least partially block the inner end edge 121, wherein the lower end of the annular wall 1111 and the inner end edge 121 of the lower cover 12 have a fourth gap, and the fourth gap constitutes an annular gap connecting the third cavity 13 and the outside. Since the cavity 13 in the prior art is a closed cavity 13, it can block the heat transfer from the upper cover 11 to the lower cover 12, but the cavity 13 of the present solution is not only an open cavity 13, but can make the air in the cavity 13 flow slightly, which can reduce the heat accumulated in the upper cover 11 during the combustion process and conduct it to the lower cover 12. In order to ensure that the annular gap has sufficient static air layer thickness for insulation and avoid convective heat transfer losses caused by large air flow, the annular gap needs to be no larger than 2mm, which can reduce the contact area between the two layers, reduce contact heat transfer losses, and ensure a small flow of air between the two layers. In addition, the outer cover 14 is also provided on the periphery of the cover body 1. The first cavity between the outer cover 14 and the cover body 1 is connected to the annular cavity and the outside world, and serves as the first air replenishment cavity 300. The outer cover 14 has a first air inlet 141 connected to the first air replenishment cavity 300. The cover body 14 also includes a bottom plate 400 located below the outer cover 14. The second cavity between the bottom plate 400 and the outer cover 14 is connected to the annular cavity 10 and the outside world, and serves as the second air replenishment cavity 500. In order to achieve that the secondary air can be slowly reduced along the replenishment direction of the secondary air replenishment when passing through the first air replenishment cavity 300, and gradually preheated at the same time, preferably, a partition is also provided in the first air replenishment cavity 300, and the edge of the partition is against the bottom wall of the cover body 1 to divide the first air replenishment cavity 300 into at least two sub-cavities, and each sub-cavity is fluidly connected to the first air inlet 141. Separating each sub-cavity by a partition has the following advantages: First, the first cavity of the first air replenishment cavity 300 is divided into a plurality of relatively independent closed sub-cavities, so as to effectively reduce the convective heat exchange of the air in the first cavity, and also reduce the convective heat exchange between the air in the first cavity and the air outside the first cavity, further improving the heat insulation property of the heat insulation cover; Second, after the secondary air passes through a plurality of sub-cavities, the amount of secondary air that finally flows into the sub-annular cavity is reduced; Third, due to the enhanced heat insulation property of the heat insulation cover, the secondary air that finally flows into the sub-annular cavity can be more easily fully preheated, thereby improving the gas utilization rate. In order to better enable the secondary air to gradually flow into each sub-cavity along the flow direction of the airflow, so that the secondary air can be slowly reduced along the supply direction of the secondary air supply when passing through the first air replenishment cavity 300, and gradually preheated at the same time, along the flow direction of the airflow of the first air inlet 141, the bottoms of adjacent sub-cavities gradually tilt upward along the direction from outside to inside.The arrangement of the partition is based on the view of structural simplicity. The partition includes a first partition plate 600 and a second partition plate 700 which are arranged radially from the inside to the outside, so as to divide the first air supplement chamber 300 into a first sub-cavity 6001 adjacent to the annular cavity, a second sub-cavity 6002 away from the annular cavity, and a third sub-cavity 6003 located between the first sub-cavity 6001 and the second sub-cavity 6002. The first partition plate 600 includes a first vertical portion 600a and a first transverse portion 600b. The first vertical portion 600a abuts against the bottom wall of the cover body, and the first transverse portion 600b has a first interval with the bottom wall of the cover body, so as to form a partition for discharging gas to the first air supplement chamber 300. The first air outlet 600c of the annular cavity for air replenishment; the first transverse portion 600b is provided with at least two through holes 600d in fluid communication with the third sub-cavity 6003 at intervals along the circumferential direction; correspondingly, the second partition plate 700 includes a second vertical portion 700a and a second transverse portion 700b, the second vertical portion 700a abuts against the bottom wall of the cover body, and the second transverse portion 700b and the bottom wall of the cover body have a second interval, and the second transverse portion 700b and the first vertical portion 600a have a third interval, and at least part of the secondary air in the second sub-cavity 6002 passes through the third interval into the third sub-cavity 6003 and then flows into the first sub-cavity 6001. In order to slowly reduce the secondary air entering the second sub-cavity 6002, the cross-sectional area of ​​the second sub-cavity 6002 gradually decreases along the flow direction of the secondary air. In addition, the upper cover 11 has a partition 200 protruding from its upper surface, and the partition 200 divides the upper cover 11 into an energy gathering area 2001 located on the inner side and a liquid storage area 2002 located on the outer side. The liquid storage area 2002 can store overflow generated during the cooking process in the liquid storage area 2002 to prevent the overflow from clogging the fire hole. In order to better achieve the energy gathering effect of the energy gathering cover for the stove, the energy gathering area 2001 is sunken compared to the liquid storage area 2002.

[0034] In order to better achieve the air replenishment effect of the second air replenishment cavity 500 in this embodiment, preferably, the bottom plate 400 is inclined from the inside to the outside, wherein the inner edge of the bottom plate 400 corresponds to the middle of the first lateral portion 600b of the first sub-cavity 6001, and gradually inclines upward from the outside to the inside to form the guide edge 4001 of the second air replenishment cavity 500. The air replenishment path of the first air replenishment cavity 300 is a channel, in which the secondary air first enters from the first air inlet 141, and then passes through the second sub-cavity 6002 with a gradually decreasing cross-sectional area, the secondary air slowly decreases, and is gradually preheated; after reaching the bottom plate 400, it goes inward, passes through the third sub-cavity 6003 and the first sub-cavity 6001, wherein the third sub-cavity 6003 serves as a retention area of ​​the first air replenishment cavity 300, and the retention area prolongs the retention time of the secondary air here, thereby enhancing the retention time of the secondary air and further preheating, and finally passes through the through hole 600d of the first transverse portion 600b so that the fully preheated secondary air can better flow into the first sub-cavity 6001; on the contrary, the overflow in the cooking process passes through the first sub-cavity 6001, the third sub-cavity 6003 and the second sub-cavity 6002 and gradually flows out to the outer cover 14, and the setting of the guide edge 4001 can prevent the overflow from continuing to flow inward.

[0035] refer to Figures 3 to 5The present embodiment also provides a gas stove using the above-mentioned stove energy-gathering cover, including a liquid receiving tray 2 and a burner 3, a cover body 1 is arranged on the liquid receiving tray 2 and surrounds the burner 3, the burner 3 includes a base 4 with an outer ring gas channel and an inner ring fire cover 9 arranged on the base 4, a central air mixing chamber 91 is formed between the inner ring fire cover 9 and the base 4, an outer ring fire cover 6 is also arranged on the base and is located outside the inner ring fire cover 9, an outer ring air mixing chamber 66 is formed between the outer ring fire cover and the base 4, and outer fire holes 61 are also opened on the outer ring wall 62 of the outer ring fire cover 6 at intervals along the circumferential direction, the first transverse portion 600b of the first air supplement cavity 300 abuts against the area below the first outer ring portion 621 of the outer ring wall 62, and a buffer cavity 800 is provided between the bottom plate 400 and the panel 900 at the bottom periphery or adjacent to the bottom periphery of the lower cover 12, and the second air supplement cavity 500 is provided through The buffer chamber 800 and the secondary air supply channel 1001 are connected to the outer wall area of ​​the central mixing chamber 91, the first air outlet 600c of the first air supply chamber 300 is connected to the outer fire hole 61 area of ​​the outer ring mixing chamber 66, and the first transverse portion 600b of the first air supply chamber 300 is in contact with the area below the first outer ring portion 621 of the outer ring wall. The secondary air is forced to be diverted through the first transverse portion 600b so that both the inner and outer rings can burn fully, which is particularly suitable for the outer ring fire cover 6 with two rings of fire. The first transverse portion 600b of the first air supply chamber 300 is in contact with the area below the first outer ring portion 621 of the outer ring wall, which can avoid the mutual influence of the secondary air between the inner ring and the outer ring, has accurate positioning, and improves the gas combustion efficiency. At the same time, the first transverse portion 600b can recycle the heat of the mixing chamber, can preheat the secondary air, and help improve the thermal efficiency of the burner.

Claims

1. A stove energy-gathering hood, comprising an annular hood body (1), an annular cavity (10) being formed in the center of the hood body (1), characterized in that: The invention also comprises an outer cover (14) located outside the cover body (1), a first cavity between the outer cover (14) and the cover body (1) communicating with the annular cavity (10) and the outside world, serving as a first air replenishment cavity (300), the outer cover (14) having a first air inlet (141) communicating with the first air replenishment cavity (300), and a bottom plate (400) located below the outer cover (14), a second cavity between the bottom plate (400) and the outer cover (14) communicating with the annular cavity (10) and the outside world, serving as a second air replenishment cavity (500); A partition is also provided in the first air supplement cavity (300), and the edge of the partition is against the bottom wall of the cover body to divide the first air supplement cavity (300) into at least two sub-cavities, each of which is in fluid communication with the first air inlet (141); Along the airflow direction of the first air inlet (141), the bottom of the adjacent sub-cavity gradually tilts upward from the outside to the inside; The partition comprises a first partition plate (600) and a second partition plate (700) which are arranged radially from the inside to the outside, so as to divide the first air supply chamber (300) into a first sub-cavity (6001) adjacent to the annular cavity, a second sub-cavity (6002) away from the annular cavity (10), and a third sub-cavity (6003) located between the first sub-cavity (6001) and the second sub-cavity (6002), wherein the first partition plate (600) comprises a first vertical portion (600a) and a first transverse portion (600b), wherein the first vertical portion (600a) is against the bottom wall of the cover body (1), and the first transverse portion (600b) has a first interval with the bottom wall of the cover body (1), thereby forming a gas supply chamber (300) for supplying air to the annular cavity (10). a first air outlet (600c); the first transverse portion (600b) is provided with at least two through holes (600d) in fluid communication with the third sub-cavity (6003) at intervals along the circumferential direction; correspondingly, the second partition plate (700) comprises a second vertical portion (700a) and a second transverse portion (700b); the second vertical portion (700a) abuts against the bottom wall of the cover body (1), and the second transverse portion (700b) and the bottom wall of the cover body (1) have a second interval; a third interval is provided between the second transverse portion (700b) and the first vertical portion (600a); at least part of the secondary air in the second sub-cavity (6002) enters the third sub-cavity (6003) through the third interval and then flows into the first sub-cavity (6001); The cross-sectional area of ​​the second sub-cavity (6002) gradually decreases along the flow direction of the secondary air.

2. The energy concentrating hood for a stove according to claim 1, characterized in that: The cover body (1) comprises an upper cover (11) and a lower cover (12) which are matched to each other, and a third cavity (13) is formed between the upper cover (11) and the lower cover (12), and the upper cover (11) and the lower cover (12) have a circumferential annular seam at the junction of the inner periphery and / or the outer periphery for connecting the third cavity (13) with the outside.

3. The energy concentrating hood for a stove according to claim 2, characterized in that: The upper cover (11) has an inner end edge (111) adjacent to the annular cavity (10), and the lower cover (12) has an inner end edge (121) adjacent to the annular cavity (10). The inner end edge (111) of the upper cover (11) extends downwardly with an inner flange (1111), and the inner flange (1111) can at least partially cover the inner end edge (121). The lower end of the inner flange (1111) and the inner end edge (121) of the lower cover (12) have a fourth gap, and the fourth gap constitutes an annular gap connecting the third cavity (13) and the outside.

4. The energy concentrating hood for a stove according to claim 3, characterized in that: The upper cover (11) has a partition (200) protruding from its upper surface, and the partition (200) divides the upper cover (11) into an energy gathering area (2001) located on the inner side and a liquid storage area (2002) located on the outer side.

5. The energy concentrating hood for a stove according to claim 4, characterized in that: The energy-gathering area (2001) is deeper than the liquid storage area (2002).

6. The energy concentrating hood for a stove according to claim 5, characterized in that: The bottom plate (400) is inclined from inside to outside, wherein the inner edge of the bottom plate (400) corresponds to the middle of the first transverse portion (600b) of the first sub-cavity (6001), and gradually inclines upward from outside to inside to form a guide edge (4001) of the second air replenishing cavity (500).

7. A gas stove using the stove energy-gathering hood according to any one of claims 1 to 6, comprising a panel and a burner (3), wherein the hood (1) is arranged on the panel and surrounds the burner (3), and the burner comprises: Base (4); An inner ring fire cover (9) is arranged on the base (4) and forms a central gas mixing chamber (91) with the base (4); The outer ring fire cover (6) is also arranged on the base (4), is located outside the inner ring fire cover (9), and forms an outer ring gas mixing chamber (66) with the base (4); External fire holes (61) are arranged on the outer ring wall (62) of the outer ring fire cover (6) at intervals along the circumferential direction; Features: The first transverse portion (600b) of the first air supplement cavity (300) abuts against the area below the first outer ring portion (621) of the outer ring wall (62).

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