Energy gathering cover for gas stove and gas stove using the energy gathering cover

Abstract

The present invention relates to an energy-gathering hood for a gas stove and a gas stove using the energy-gathering hood for a gas stove, comprising a hood body surrounded by a central hole, wherein the hood body comprises an upper hood and a lower hood which are matched to each other, and a cavity is formed between the upper hood and the lower hood, and is characterized in that: the bottom periphery of the lower hood or the vicinity of the bottom periphery thereof has a first extension portion which extends downward and is used to block secondary air. Compared with the prior art, the advantage of the present invention is that the bottom periphery of the energy-gathering hood or the vicinity of the bottom periphery thereof has the first extension portion which extends downward, thereby narrowing the secondary air passage formed by the external secondary air passing through the first extension portion, which can increase the air intake resistance, reduce the supplementary amount of the secondary air, and reduce the excess air, which is beneficial to reducing the heat carried away by the large amount of smoke generated.

Description

Technical Field

[0001] The invention relates to an energy-gathering cover for a gas stove, and also relates to a gas stove using the energy-gathering cover for the gas 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 added. The hood body is a double-layer structure composed 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 an energy-gathering hood for a gas stove 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 an energy-gathering hood for a gas stove that can effectively reduce downward heat conduction losses in response to the above-mentioned prior art status.

[0006] The third technical problem to be solved by the present invention is to provide a gas stove using the above-mentioned energy-gathering hood 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 energy-gathering hood for the gas stove includes a hood body, the hood body includes an upper hood and a lower hood that are matched to each other, and a cavity is formed between the upper hood and the lower hood, characterized in that: the bottom periphery of the lower hood or adjacent to its bottom periphery has a first extension portion extending downward.

[0008] Furthermore, 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.

[0009] In order to better achieve the energy gathering effect of the energy gathering cover, preferably, the energy gathering area is sunken more than the liquid storage area.

[0010] From the perspective of structure and processing convenience, preferably, the first extension is V-shaped or straight. If the base is made of sheet metal, the first extension can be stretched out through the lower cover, while the straight first extension needs to be welded separately. If the base is made of aluminum, both solutions can be made in one piece, and the difference is not big.

[0011] Furthermore, the junction between the inner periphery and / or the outer periphery of the cover body has an annular seam along the circumferential direction for connecting the cavity with the outside.

[0012] In order to solve the second technical problem, 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 supporting the upper cover with the convex strips of the lower 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.

[0013] 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.

[0014] Preferably, the inner flange also has an inclined portion which gradually tilts upward from the outside to the inside. The inner flange also has the function of guiding secondary air.

[0015] 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.

[0016] 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.

[0017] To solve the third technical problem, the present invention also provides a gas stove using the above-mentioned energy-gathering hood for a gas stove, comprising a panel and a burner, characterized in that the hood body is arranged on the panel and surrounds the burner, and there is a gap between the bottom periphery of the lower hood or the first extension portion adjacent to its bottom periphery and the panel.

[0018] In order to further slow down the flow of secondary air into the burner, preferably, the panel is provided with a second extension portion protruding upwardly at the upstream of the first extension portion along the inflow direction of the secondary air.

[0019] Furthermore, the burner comprises:

[0020] a base having an outer ring gas passage;

[0021] An outer ring fire cover is arranged on the base and forms a gas mixing chamber with the base;

[0022] The outer fire holes are arranged at intervals along the circumferential direction on the outer ring wall of the outer ring fire cover; the annular gap 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 holes.

[0023] 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.

[0024] Furthermore, the side wall of the upper cover gradually tilts outward from inside to outside, and the angle α between the tangent of the side wall of the upper cover 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 energy gathering cover used for the gas stove, 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 excessive smoke. 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.

[0025] 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.

[0026] Preferably, the height difference Δh between the highest point of the energy gathering area of ​​the upper cover 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 of the outer fire hole; Δh cannot be too large, otherwise it will easily reduce the energy gathering effect of the energy gathering cover for the gas stove.

[0027] 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.

[0028] 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

[0029] 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.

[0030] Compared with the prior art, the advantage of the present invention is that the bottom periphery of the energy collecting hood of the present invention or the vicinity of the bottom periphery thereof has a first extension portion extending downward, so that the secondary air passage formed by the external secondary air passing through the first extension portion becomes narrower, and the cross-sectional area of ​​the passage is significantly reduced, which has the following advantages: First, the air intake resistance is increased, the amount of supplementary secondary air is reduced, and the reduction of excess air is conducive to reducing the heat carried away by a large amount of flue gas; second, the space becomes smaller, the secondary air flow rate will increase, and the increase in flow rate is conducive to heat exchange, which has a better effect of preheating the secondary air, and the secondary air preheating can improve the thermal efficiency; third, the secondary air flow is closer to the liquid tray, which can The temperature of the liquid collecting pan is lowered, thereby reducing the downward propagation of heat and reducing the risk of glass panel cracking; Fourth, the first extension portion is also a liquid cutoff eaves. When overflow occurs during the cooking process, the overflow may flow inward along the curvature of the back side of the energy collecting cover base. When it flows to the first extension portion, it can only drip and no longer flow inward. Therefore, it can well prevent the overflow from flowing inward and clogging the burner. The present invention also provides a gas stove using the above-mentioned energy collecting cover for gas stoves. The annular seam at the junction of the energy collecting cover for gas stoves and the inner periphery can appropriately supplement air to the outer fire hole of the outer ring fire cover, thereby improving the thermal efficiency of the burner while avoiding causing temperature rise of the panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the front structure of the energy collecting cover for the gas stove in Example 1 of the present invention;

[0032] Figure 2 It is a cross-sectional view at one angle of the energy collecting cover used for the gas stove in Embodiment 1 of the present invention;

[0033] Figure 3 It is a cross-sectional view of another angle of the energy collecting cover for the gas stove in Embodiment 1 of the present invention;

[0034] Figure 4 This is a schematic structural diagram of an upper cover in an energy-gathering cover for a gas stove in Embodiment 1 of the present invention;

[0035] Figure 5 This is a schematic structural diagram of the lower cover in the energy-gathering cover for a gas stove in Embodiment 1 of the present invention;

[0036] Figure 6 for Figure 4 A schematic diagram of a structure in which an energy collecting hood and a burner for a gas stove are placed on a liquid receiving tray;

[0037] Figure 7 for Figure 6 A cross-sectional view at an angle;

[0038] Figure 8 for Figure 6 A cross-sectional view from another angle;

[0039] Fig. 9 is a schematic diagram of the structure of the connector in Example 1 of the present invention;

[0040] Fig.10 This is a schematic diagram of the structure of the outer ring fire cover in Example 1 of the present invention;

[0041] Fig.11 This is a schematic diagram of the structure of a burner in Example 2 of the present invention;

[0042] Fig.12 for Fig.11 A cross-sectional view of

[0043] Fig.13 Schematic diagram of the structure of the burner in Example 3 of the present invention;

[0044] Fig.14 for Fig.13 A cross-sectional view of

[0045] Fig.15 Schematic diagram of the structure of the burner in Example 4 of the present invention;

[0046] Fig.16 for Fig.15 sectional view of . DETAILED DESCRIPTION

[0047] The present invention is further described in detail below with reference to the accompanying drawings.

[0048] Example 1

[0049] like Figures 1 to 10As shown, it is the best embodiment of the present invention. The energy-gathering cover for the gas 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 avoids 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.

[0050] 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.

[0051] refer to Figures 6 to 10 The present invention also provides a gas stove using the above-mentioned energy-gathering cover for a gas stove, comprising 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 comprises a base 4 having 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 having 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.

[0052] 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 energy gathering cover for the gas 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 of the outer fire hole 61; Δh cannot be too large, otherwise it will easily reduce the energy gathering effect of the energy gathering cover for the gas stove. In this embodiment, Δh=3 mm.

[0053] 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.

[0054] Example 2

[0055] The structure is basically the same as that of Example 1, with the only difference being that the bottom periphery of the lower cover 12 of the energy-gathering cover or the vicinity thereof has a first extension portion 100 extending downward for blocking the secondary air, and the bottom periphery of the energy-gathering cover or the vicinity thereof has a first extension portion 100 extending downward, thereby narrowing the secondary air passage formed by the external secondary air passing through the first extension portion 100, and significantly reducing the cross-sectional area of ​​the passage, which has the following advantages: First, the air intake resistance increases, the amount of secondary air replenishment is reduced, and reducing excess air is conducive to reducing the heat carried away by a large amount of flue gas; second, the space becomes smaller, the secondary air flow rate will increase, and the increase in flow rate is conducive to heat exchange, which has a better effect of preheating the secondary air, and the secondary air preheating can improve the thermal efficiency ; Third, the secondary air flow fits the liquid tray more closely, which can reduce the temperature of the liquid tray, thereby reducing the downward transmission of heat and reducing the risk of glass panel bursting; Fourth, the first extension portion 100 is also a liquid-breaking eaves. When overflow occurs during the cooking process, the overflow may flow inward along the curvature of the back of the energy-gathering cover base. When it flows to the first extension portion 100, it can only drip and no longer flow inward. Therefore, it can well prevent the overflow from flowing inward to block the burner. In addition, the upper cover 11 has a partition 200 protruding from its upper surface. 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 energy-gathering area 2001 is more sunken than the liquid storage area. The first extension portion 100 of this embodiment is V-shaped, such as Fig.11 and 12 shown.

[0056] Example 3

[0057] The structure is basically the same as that of the second embodiment, the only difference being that the first extension portion 100 is in a straight line shape. Fig.13 and 14 shown.

[0058] Example 4

[0059] The structure is basically the same as that of the second embodiment, the only difference being that the panel is provided with a second extension portion 300 protruding upwardly at the upstream of the first extension portion along the inflow direction of the secondary air. The second extension portion 300 of the present embodiment is formed by the liquid receiving tray 2 protruding upwardly. Fig.15 and 16 shown.

Claims

1. An energy-gathering cover for a gas stove, comprising a cover body (1), wherein the cover body (1) comprises an upper cover (11) and a lower cover (12) which are aligned with each other, and a cavity (13) is formed between the upper cover (11) and the lower cover (12), characterized in that: The bottom periphery of the lower cover (12) or the vicinity of the bottom periphery thereof has a first extension portion (100) extending downward for blocking secondary air; 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 energy gathering area (2001) is more sunken than the liquid storage area (2002); The first extension portion (100) is V-shaped or straight-shaped; The junction of the inner periphery and / or the outer periphery of the cover body (1) has an annular seam along the circumferential direction, which is used to connect the cavity (13) with the outside; The upper cover (11) has an inner end edge (111) adjacent to the central hole (10), the lower cover (12) has an inner end edge (121) adjacent to the central hole (10), and the inner end edge (121) of the lower cover (12) is provided with at least two convex strips (1211) extending upwards at intervals in the circumferential direction, and the convex strips (1211) support the inner end edge (111) of the upper cover (11) to form the annular gap; 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), 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 turning edge (1111), and the inner turning edge (1111) can at least partially cover the annular convex wall (1212); The inner flange (1111) also has an inclined portion (111a) that gradually inclines upward from the outside to the inside; The inclined portion (111a) has an angle ∂ with the horizontal plane, and 50°≤∂≤80°; 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) 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; 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).

2. The energy collecting cover for a gas stove according to claim 1, characterized in that: A pot support foot (500) is fixed on the top periphery of the upper cover (11).

3. A gas stove using the energy collecting cover for a gas stove as claimed in any one of claims 1 to 2, comprising a panel and a burner (3), characterized in that: The cover body (1) is arranged on a panel and surrounds the burner (3); a gap exists between the bottom periphery of the lower cover or a first extension portion (100) adjacent to the bottom periphery of the lower cover and the panel.

4. The gas stove according to claim 3, characterized in that: The panel is provided with a second extension portion (300) protruding upwards at the upstream of the first extension portion along the inflow direction of the secondary air.

5. The gas stove according to claim 4, characterized in that: The burner (3) comprises: A base (4) having an outer ring gas channel (41); An outer ring fire cover (6) is arranged on the base (4) and forms a gas mixing chamber with the base (4); The outer fire holes (61) are arranged at intervals along the circumferential direction on the outer ring wall (62) of the outer ring fire cover (6); 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 holes (61).

6. The gas stove according to claim 5, characterized in that: 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, so as to jointly form an air supply channel (7) corresponding to the fire outlet area of ​​the outer fire hole (61).

7. The gas stove according to claim 6, characterized in that: The side wall (15) of the upper cover (11) is gradually inclined outward from the inside to the outside, and the angle α between the tangent line of the side wall (15) of the upper cover (11) and the horizontal plane and the angle β between the axis line of the outer fire hole (61) of the fire cover and the horizontal plane satisfy the following relationship: β=0.8~0.9α.

8. The gas stove according to any one of claims 5 to 7, characterized in that: 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) has an inner ring wall (64) extending vertically or obliquely downward, and the outer edge of the annular top wall (63) has an outer ring wall (62) extending vertically or obliquely downward, and the outer ring wall (62) has a flame stabilizing groove (66) or a flame stabilizing hole below the outer fire hole (61). 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.

9. The gas stove according to claim 8, characterized in that: The height difference ∆h between the highest point of the energy focusing area 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.

10. The gas stove according to claim 9, 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°.

11. The gas stove according to claim 10, characterized in that: The inner flange (1111) has an angle ∂ with the horizontal plane, and 50°≤∂≤80°.

12. The gas stove according to claim 11, 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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