Heat insulation cover for stove and gas stove using the heat insulation cover

Abstract

The present invention relates to a heat insulation cover for a stove and a gas stove using the heat insulation cover for a stove, comprising a cover body surrounded by a central hole, the cover body comprising an upper cover and a lower cover which are matched to each other, and a cavity is formed between the upper cover and the lower cover, and is characterized in that: the upper cover and the lower cover 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 cavity with the outside. Compared with the prior art, the advantage of the present invention is that the heat insulation cover for a stove of the present invention is an open cavity, which can make the air in the cavity flow slightly, and can reduce the heat accumulated in the upper cover during the combustion process and conduct it to the lower cover. In order to meet the requirement that the annular seam has enough static air layer thickness for insulation and avoid the convective heat exchange loss caused by the large air flow, the heat insulation cover can better supplement the secondary air to the outer fire hole of the outer ring fire cover.

Description

Technical Field

[0001] The invention relates to a heat insulation cover for a stove and also relates to a gas stove using the heat insulation cover for the 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, "A heat-insulating cover for a stove and a stove using the heat-insulating cover for a 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-convex structure A convex rib protruding downward is formed. On the basis of the existing gas stove, a stove heat insulation cover is added. The cover body is a double-layer structure composed of an upper cover and a lower cover. The bottom of the lower cover 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 cover into a channel for preheating secondary air, which promotes gas combustion and improves gas utilization. The upper cover and the lower cover are closed and connected. The air inside does not flow. Although it blocks the heat transfer from the upper cover to the lower cover, the lower cover 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 cover.

[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 heat insulation cover which can reduce the downward heat conduction loss in view of the above-mentioned existing technical status.

[0005] The second technical problem to be solved by the present invention is to provide a heat insulating cover for a stove that ensures smooth lateral secondary air supply to the burner in response to the above-mentioned existing technical status.

[0006] The third technical problem to be solved by the present invention is to provide a gas stove using the above stove heat insulation cover in view of the above-mentioned existing technical status.

[0007] In order to solve the first technical problem mentioned above, the technical solution adopted by the present invention is: the heat insulation cover for the stove includes a cover body surrounded by a central hole, the cover body includes an upper cover and a lower cover that are matched to each other, and a cavity is formed between the upper cover and the lower cover, and it is characterized in that: the upper cover and the lower cover have an annular seam along the circumferential direction at the junction of the inner periphery and / or the outer periphery, which is used to connect the cavity with the outside.

[0008] In order to reduce the heat conduction between the upper cover and the lower cover, preferably, the upper cover has an inner end edge adjacent to the central hole, the lower cover has an inner end edge adjacent to the central hole, and the inner end of the lower cover is provided with at least two convex strips extending upwards at intervals along the circumferential direction, and the convex strips support the inner end edge of the upper cover to form the annular gap. Point contact is achieved by the convex strips of the lower cover supporting the upper cover; since the cavity in the prior art is a closed cavity, it can block the upper cover from transferring heat downward to the lower cover, but the cavity of the present solution is not only an open cavity, but also can make the air in the cavity flow slightly, which can reduce the heat accumulated in the upper cover during the combustion process and conduct to the lower cover. In order to meet the requirement that the annular gap has enough static air layer thickness to insulate and avoid the convective heat exchange loss caused by large air flow, the annular gap needs to 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.

[0009] In order to prevent overflowing liquid from entering the annular gap, preferably, the inner end of the lower cover has an outer end edge extending upward from the top, the convex strip is arranged on the annular convex wall, and the inner end edge of the upper cover is turned downward to form an inner turn-down edge, and the inner turn-down edge can at least partially cover the annular convex wall.

[0010] To solve the second technical problem, preferably, the inner flange also has an inclined portion that gradually tilts upward from the outside to the inside. The inner flange also has the function of guiding secondary air.

[0011] In addition to the annular gap connecting the outside world and the cavity formed between the upper cover and the lower cover on the side adjacent to the central hole, an annular gap connecting the outside world and the cavity is also formed between the upper cover and the lower cover on the side away from the central hole. Preferably, the upper cover has an outer end edge away from the central hole, and the lower cover has an outer end edge away from the central hole. The inner wall of the outer end edge of the lower cover is provided with at least two upwardly extending protrusions at intervals along the circumferential direction, and the protrusions support the outer end edge of the upper cover to form the annular gap. The protrusions of the lower cover support the upper cover to achieve point contact, which can reduce the heat accumulated in the upper cover during the combustion process and conduct to the lower cover; annular gaps connecting the outside world and the cavity are formed between the upper cover and the lower cover on the side adjacent to the central hole and away from the central hole. The annular gaps constitute the air supply channel corresponding to the fire outlet area of ​​the outer fire hole. The air can be preheated when it enters from the annular gap away from the central hole to the annular gap adjacent to the central hole, so that the preheated air can be appropriately supplemented to the fire outlet area of ​​the outer fire hole.

[0012] In order to prevent overflow from entering the annular gap away from the central hole, preferably, an annular wall extends upward along the top of the outer end of the lower cover, the top of the annular wall is lower than the top of the protrusion, and the outer end edge of the upper cover is turned downward to form an outer flange, and the outer flange can at least partially cover the annular wall.

[0013] To solve the third technical problem, the present invention further provides a gas stove using the above stove heat insulation cover, comprising a liquid receiving tray and a burner, characterized in that: the cover body is arranged on the liquid receiving tray and surrounds the burner, and the burner comprises:

[0014] A base having an outer ring gas passage;

[0015] An outer ring fire cover is arranged on the base and forms a gas mixing chamber with the base;

[0016] External fire holes are arranged on the outer ring wall of the outer ring fire cover at intervals along the circumferential direction;

[0017] Features:

[0018] The annular seam at the junction of the upper cover and the lower cover at the inner periphery corresponds to the fire outlet area of ​​the outer fire hole.

[0019] Furthermore, the upper cover and the lower cover both have an annular slit at the junction of the inner periphery and the outer periphery to jointly form an air supply channel corresponding to the fire outlet area of ​​the outer fire hole. The air can be preheated when it enters the annular slit of the outer periphery into the annular slit of the inner periphery, so that the preheated air can be appropriately supplied to the fire outlet area of ​​the outer fire hole.

[0020] Furthermore, the side wall of the cover body gradually tilts outward from inside to outside, and the angle α between the tangent line of the side wall of the cover body and the horizontal plane and the angle β between the axis of the outer fire hole of the fire cover and the horizontal plane satisfy the following relationship: β=0.8~0.9α. Since the inclination angle of the side wall of the cover body plays a critical role in the energy-gathering effect of the heat-insulating cover for stoves, the angular relationship between the side wall of the cover body and the fire hole outside the burner fire cover is particularly critical. If the angle of the outer fire hole is too large and the inclined surface of the side wall of the cover body is too small, the flame formed by the fire hole outside the burner fire cover will burn the side wall of the cover body, making it impossible to replenish secondary air, and the burner will not burn fully, which may easily cause smoke to exceed the standard; if the angle of the outer fire hole is too small and the inclined surface of the side wall of the cover body is too large, the energy-gathering effect of the side wall of the cover body will deteriorate, and the angle α between the tangent of the side wall of the cover body and the horizontal plane and the angle β between the axis of the outer fire hole of the fire cover and the horizontal plane satisfy the following relationship: β=0.8~0.9α, which can make the gas stove have very good performance in efficiency and smoke emission.

[0021] In order to prevent the cooking liquid from overflowing into the burner head, external fire hole, etc. of the burner, preferably, the upper surface of the bottom of the cover body gradually slopes downward from the inside to the outside in the radial direction, forming a liquid storage area together with the side wall of the cover body.

[0022] In order to better supplement the secondary air to the root of the outer fire hole of the fire cover, preferably, the outer ring fire cover includes an annular fire cover body, the fire cover body includes an annular top wall, the inner edge of the annular top wall extends vertically or obliquely downward with an inner ring wall, the outer edge of the annular top wall extends vertically or obliquely downward with an outer ring wall, the outer ring wall has a flame stabilizing groove or a flame stabilizing hole below the outer fire hole, and the highest point of the upper surface of the bottom of the cover body is lower than the lowest point of the flame stabilizing groove or the flame stabilizing hole. The highest point of the upper surface of the bottom of the cover body is lower than the lowest point of the flame stabilizing groove or the flame stabilizing hole, and the flame stabilizing groove or the flame stabilizing hole can also be supplemented with secondary air.

[0023] Preferably, the height difference Δh between the highest point of the upper surface of the bottom of the cover body and the lowest point of the flame stabilizing groove or flame stabilizing hole is 1-4 mm. Δh cannot be too small, otherwise the amount of secondary air outside the fire cover will be small, which will easily affect the supplement of secondary air in the outer fire hole; Δh cannot be too large, otherwise it will easily reduce the energy gathering effect of the stove heat insulation cover.

[0024] Furthermore, the outer ring wall includes a first outer ring portion below the flame stabilizing groove or flame stabilizing hole, the first outer ring portion gradually tilts upward from the outside to the inside, the first outer ring portion has an angle γ with the horizontal plane, and 65°≤γ≤85°. The first outer ring portion can assist in replenishing secondary air to the root of the flame stabilizing groove or flame stabilizing hole.

[0025] In order to better supply the secondary air to the outer fire hole, flame stabilizing groove or flame stabilizing hole of the fire cover, preferably, the inner flange has an angle with the horizontal plane. and

[0026] Similarly, in order to enable the inner flange to better supplement secondary air to the outer fire hole flame stabilizing groove or flame stabilizing hole of the fire cover, preferably, the distance d between the inner flange and the first outer ring portion satisfies: 4mm≤d≤8mm.

[0027] Compared with the prior art, the advantage of the present invention is that the heat insulation cover for stoves of the present invention is an open cavity, which can make the air in the cavity flow slightly, and can reduce the heat accumulated in the upper cover during the combustion process and conduct it to the lower cover. In order to meet the requirement that the annular gap has sufficient static air layer thickness for insulation and avoid the convective heat exchange loss caused by large-scale 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 gap at the junction of the inner periphery and / or the outer periphery. The present invention also provides a gas stove using the above-mentioned heat insulation cover for stoves, and the annular gap at the junction of the inner periphery of the heat insulation cover for stoves can appropriately supplement air to the outer fire hole of the outer ring fire cover, thereby improving the thermal efficiency of the burner and avoiding the temperature rise of the liquid receiving pan. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the front structure of the heat insulation cover for a stove in an embodiment of the present invention;

[0029] Figure 2 A cross-sectional view of a heat insulation cover for a stove according to an embodiment of the present invention at one angle;

[0030] Figure 3 is a cross-sectional view of another angle of the heat insulation cover for a stove in an embodiment of the present invention;

[0031] Figure 4 Schematic diagram of the structure of the upper cover of the heat insulation cover for stoves in an embodiment of the present invention;

[0032] Figure 5 Schematic diagram of the structure of the lower cover of the heat insulation cover for stoves in the embodiment of the present invention;

[0033] Figure 6 for Figure 4 A schematic diagram of the structure in which the heat shield and burner for the central stove are placed on the liquid receiving tray;

[0034] Figure 7 for Figure 6 A cross-sectional view at an angle;

[0035] Figure 8 for Figure 6 A cross-sectional view from another angle;

[0036] Fig. 9 This is a schematic diagram of the structure of a connector in an embodiment of the present invention;

[0037] Fig.10 It is a schematic diagram of the structure of the outer ring fire cover in an embodiment of the present invention. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below with reference to the accompanying drawings.

[0039] like Figures 1 to 10 As shown, it is the best embodiment of the present invention. The heat insulation cover for 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 heat insulation cover for 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.

[0040] In order to reduce the 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. The inner end edge 121 of the lower cover 12 is circumferentially spaced with at least two convex strips 1211 extending upward, and the convex strips 1211 support the inner end edge 111 of the upper cover 11 to form an annular gap, that is, an inner annular gap 14. The convex strips 1211 of the lower cover 12 support the upper cover 11 to achieve point contact. Since the cavity 13 in the prior art is a closed cavity 13 can block the upper cover 11 from transferring heat downward to the lower cover 12, but the cavity 13 of this scheme is not only an open cavity 13, but also 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 from being transferred to the lower cover 12. In order to meet the requirement that the annular gap has enough static air layer thickness to insulate and avoid the convective heat transfer loss caused by the large flow of air, the annular gap 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. In order to prevent the overflow from entering the annular gap, that is, the inner annular gap 14, preferably, the inner end of the lower cover 12 extends upward along the top of 121 with an annular convex wall 1212, and the convex strip 1211 is arranged on the annular convex wall 1212, and the inner end edge 111 of the upper cover 11 is turned downward to form an inner flange 1111, and the inner flange 1111 can at least partially block the annular convex wall 1212. The inner flange 1111 is also gradually inclined upward from the outside to the inside to guide the secondary air. In addition to the inner annular seam 14 formed at the junction of the inner periphery of the upper cover 11 and the lower cover 12 to connect the outside and the cavity 13, the upper cover 11 and the lower cover 12 also form an annular seam connecting the outside and the cavity 13 at the junction of the outer periphery, that is, the outer annular seam 14', the upper cover 11 has an outer end edge 112 away from the central hole 10, the lower cover 12 has an outer end edge 122 away from the central hole 10, and the inner wall of the outer end edge 122 of the lower cover 12 is provided with at least two upwardly extending protrusions 1221 spaced apart along the circumferential direction, and the protrusions 1221 support the outer end edge of the upper cover 11 112 is used to form an outer annular gap 14', and the upper cover 11 is supported by the protrusion 1221 of the lower cover 12 to achieve point contact, which can reduce the heat accumulated in the upper cover 11 during the combustion process and conduct it to the lower cover 12; the upper cover 11 and the lower cover 12 both have annular gaps at the junction of the inner periphery and the outer periphery to jointly form an air supply channel 7 corresponding to the fire outlet area of ​​the outer fire hole 61. The air can be preheated when it enters the inner annular gap 14' away from the central hole 10 to the inner annular gap 14 adjacent to the central hole 10, so that the preheated air can be appropriately supplemented to the fire outlet area of ​​the outer fire hole 61.In order to prevent overflow from entering the outer annular gap 14′ away from the central hole 10, preferably, an annular wall 1222 is extended upward from the top of the outer end 122 of the lower cover 12, and the top of the annular wall 1222 is lower than the top of the protrusion 1221, and the outer end edge 112 of the upper cover 11 is turned downward to form an outer flange 1121, which can at least partially cover the annular wall 1222.

[0041] refer to Figures 6 to 10 The present invention also provides a gas stove using the above-mentioned stove heat insulation cover, including a liquid tray 2 and a burner 3, a cover body 1 is arranged on the liquid tray 2 and surrounds the burner 3, the burner 3 includes a base 4 with an outer ring gas channel 41, a plate-shaped connecting body 5 arranged on the base 4, and an outer ring fire cover 6 arranged on the connecting body 5, the connecting body 5 has an opening 51 (such as Fig. 9 As shown), the convex wall extending upward from the periphery of the opening 51 supports the outer ring fire cover 6, and the outer fire holes 61 arranged on the outer ring wall 62 of the outer ring fire cover 6 at intervals along the circumferential direction, and the highest point of the inner flange 1111 of the cover body 1 is aligned with the root of the outer fire hole 61. The upper cover 11 and the lower cover 12 both have annular slits at the junction of the inner periphery and the outer periphery to jointly form an air supply channel 7 corresponding to the fire outlet area of ​​the outer fire hole 61. The air can be preheated when it enters from the outer annular slit 14′ away from the central hole 10 to the inner annular slit 14 adjacent to the central hole 10, so that the preheated air can be appropriately supplemented to the fire outlet area of ​​the outer fire hole 61.

[0042] In addition, the side wall 15 of the cover body 1 gradually tilts outward from the inside to the outside, and the angle α between the tangent line of the side wall 15 of the cover body 1 and the horizontal plane and the angle β between the axis of the outer fire hole 61 of the fire cover and the horizontal plane satisfy the following relationship: β=0.8~0.9α. Since the inclination angle of the side wall 15 of the cover body 1 plays a critical role in the energy gathering effect of the heat insulation cover for the stove, the angular relationship between the side wall 15 of the cover body 1 and the outer fire hole 61 of the fire cover of the burner 3 is particularly critical. If the angle of the outer fire hole 61 is too large and the inclined surface of the side wall 15 of the cover body 1 is too small, the flame formed by the outer fire hole 61 of the fire cover of the burner 3 will burn the side wall 15 of the cover body 1, so that the secondary air cannot be replenished, the burner 3 is not burned fully, and it is easy to cause the smoke to exceed the standard; if the angle of the outer fire hole 61 is too small and the inclined surface of the side wall 15 of the cover body 1 is too large, the energy gathering effect of the side wall 15 of the cover body 1 will be poor, and the angle α between the tangent of the side wall 15 of the cover body 1 and the horizontal plane and the angle β between the axis of the outer fire hole 61 of the fire cover and the horizontal plane satisfy the following relationship: β=0.8~0.9α, which can make the gas stove have very good performance in efficiency and smoke emission. In order to prevent the cooking liquid from overflowing into the burner head, the outer fire hole 61 and the like of the burner 3 , the upper surface of the bottom of the cover body 1 gradually slopes downward from the inside to the outside in the radial direction, forming a liquid storage area 8 together with the side peripheral wall 15 of the cover body 1 . In order to better supplement the secondary air to the root of the outer fire hole 61 of the fire cover, the outer ring fire cover 6 includes an annular fire cover body, and the fire cover body includes an annular top wall 63. The inner edge of the annular top wall 63 extends vertically or obliquely downward with an inner annular wall 64, and the outer edge of the annular top wall 63 extends vertically or obliquely downward with an outer annular wall 62. The annular top wall 63, the inner annular wall 64 and the outer annular wall 62 jointly form a mixing chamber 65. The outer fire hole 61 has at least two and is circumferentially spaced apart on the outer annular wall 62. The outer annular wall 62 has a flame stabilizing groove 66 or a flame stabilizing hole connected to the mixing chamber 65 under the outer fire hole 61. The highest point of the upper surface of the bottom of the cover body 1 is lower than the lowest point of the flame stabilizing groove 66 or the flame stabilizing hole, and the highest point of the upper surface of the bottom of the cover body 1 is lower than the lowest point of the flame stabilizing groove 66 or the flame stabilizing hole, which can also supplement the flame stabilizing groove 66 or the flame stabilizing hole with secondary air. Preferably, the height difference Δh between the highest point of the upper surface of the bottom of the cover body 1 and the lowest point of the flame stabilizing groove 66 or the flame stabilizing hole is 1-4 mm. Δh cannot be too small, otherwise the amount of secondary air outside the fire cover will be small, which will easily affect the supplement of secondary air in the outer fire hole 61; Δh cannot be too large, otherwise it will easily reduce the energy gathering effect of the stove heat insulation cover. In this embodiment, Δh=3 mm.

[0043] In addition, the outer ring wall 62 also includes a first outer ring portion 621 below the flame stabilizing groove 66 or the flame stabilizing hole. The first outer ring portion 621 gradually tilts upward from the outside to the inside. The first outer ring portion 621 has an angle γ with the horizontal plane, and 65°≤γ≤85°. The first outer ring portion 621 can assist in replenishing secondary air to the root of the flame stabilizing groove 66 or the flame stabilizing hole, and γ is preferably 70°. In order to better replenish secondary air to the outer fire hole 61 of the fire cover, the flame stabilizing groove 66 or the flame stabilizing hole, the inner edge of the cover body 1 is surrounded by a central hole 10, and the bottom lower surface of the cover body 1 has at least two secondary air supply channels 8 that pass through the central hole 10 and the outside. The inner edge of the cover body 1 has an inwardly turned inner flange 1111, and the inner flange 1111 also has an inclined portion 111a that gradually tilts upward from the outside to the inside along the air inlet of the secondary air supply channel 8 to the air outlet. The inclined portion 111a has an angle with the horizontal plane and Finally, in order to achieve that the inner flange 1111 can better supply the secondary air to the flame stabilizing groove 66 or the flame stabilizing hole of the outer fire hole 61 of the fire cover, the distance d between the inner flange 1111 and the first outer ring portion 621 satisfies: 4mm≤d≤8mm, d is preferably 6mm, (the secondary air supply path can be referred to Figure 8 The secondary air is also partially used to supplement the inner ring ignition area.

Claims

1. A gas stove, comprising a panel and a burner (3), characterized in that: The invention comprises a cover body (1) having a central hole (10), the cover body (1) comprising an upper cover (11) and a lower cover (12) which are matched with each other, and a cavity (13) is formed between the upper cover (11) and the lower cover (12), and is characterized in that: 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 / and the outer periphery, which is used to connect the cavity (13) with the outside, the cover body (1) is arranged on a panel and surrounds the burner (3), and the burner (3) comprises: A base (4) having an outer ring gas channel (41), and a plate-shaped connecting body (5) arranged on the base (4); An outer ring fire cover (6) is arranged on the base (4) and forms a gas mixing chamber 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; The annular gap at the junction of the upper cover (11) and the lower cover (12) at the inner periphery corresponds to the fire outlet area of ​​the outer fire hole (61); The upper cover (11) and the lower cover (12) both have an annular seam at the junction of the inner periphery and the outer periphery to jointly form an air supply channel (7) corresponding to the fire outlet area of ​​the outer fire hole (61); the side wall (15) of the upper cover (11) gradually tilts outward from the inside to the outside, and the angle α between the tangent of the side wall (15) of the upper cover (11) and the horizontal plane and the angle β between the axis of the outer fire hole (61) of the fire cover and the horizontal plane satisfy the following relationship: β=0.8~0.9α; The outer ring fire cover (6) includes an annular fire cover body, the fire cover body includes an annular top wall (63), the inner edge of the annular top wall (63) has an inner ring wall (64) extending vertically or obliquely downward, the outer edge of the annular top wall (63) has an outer ring wall (62) extending vertically or obliquely downward, the outer ring wall (62) has a flame stabilizing groove (66) or a flame stabilizing hole below the outer fire hole (61), and the highest point of the upper surface of the upper cover (11) of the cover body (1) is lower than the lowest point of the flame stabilizing groove (66) or the flame stabilizing hole; The height difference ∆h between the highest point of the upper surface of the upper cover (11) of the cover body (1) and the lowest point of the flame stabilizing groove (66) or the flame stabilizing hole is 1-4 mm.

2. The gas stove according to claim 1, characterized in that: 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). The inner end edge (121) of the lower cover (12) is circumferentially spaced with at least two upwardly extending convex strips (1211), and the convex strips (1211) support the inner end edge (111) of the upper cover (11) to form the annular gap.

3. The gas stove according to claim 2, characterized in that: The inner end of the lower cover (12) is provided with an annular convex wall (1212) extending upward from the top of the inner end (121), and the convex strip (1211) is arranged on the annular convex wall (1212), and the inner end edge (111) of the upper cover (11) is turned downward to form an inner turn-down edge (1111), and the inner turn-down edge (1111) can at least partially cover the annular convex wall (1212).

4. The gas stove according to claim 3, characterized in that: The inner flange (1111) also has an inclined portion that gradually inclines upward from the outside to the inside.

5. The gas stove according to claim 4, characterized in that: The inclined portion has an angle ∂ with the horizontal plane, and 50°≤∂≤80°.

6. The gas stove according to claim 1, characterized in that: The upper cover (11) has an outer end edge (112) away from the central hole (10), and the lower cover (12) has an outer end edge (122) away from the central hole (10). The inner wall of the outer end edge (122) of the lower cover (12) is provided with at least two upwardly extending protrusions (1221) at intervals along the circumferential direction, and the protrusions (1221) support the outer end edge (112) of the upper cover (11) to form the annular gap.

7. The gas stove according to claim 6, characterized in that: The outer end of the lower cover (12) is provided with an annular wall (1222) extending upward from the top of the outer end (122), and the top of the annular wall (1222) is lower than the top of the protrusion (1221), while the outer end edge (112) of the upper cover (11) is turned downward to form an outer flange (1121), and the outer flange (1121) can at least partially cover the annular wall (1222).

8. The gas stove according to any one of claims 3 to 5, characterized in that: The upper surface of the bottom of the cover body (1) gradually slopes downward from the inside to the outside in the radial direction, and together with the side peripheral wall (15) of the cover body (1) forms a liquid storage area (8).

9. The gas stove according to claim 8, characterized in that: The outer ring wall (62) includes a first outer ring portion (621) below the flame stabilizing groove (66) or the flame stabilizing hole, and the first outer ring portion (621) gradually tilts upward from the outside to the inside, and the first outer ring portion (621) has an angle γ with the horizontal plane, and 65°≤γ≤85°.

10. The gas stove according to claim 9, characterized in that: The distance between the inner flange (1111) and the first outer ring portion (621) satisfies: 4mm≤d≤8mm.

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