A gas stove

Abstract

The present application relates to a kind of gas stove, including annular cover, it is characterized in that: still including the outer cover of the lower layer cover periphery, the outer end of the upper layer cover extends to the extension edge of the outer periphery of the outer cover, the extension edge has the bending portion of bending downwards and is set with at least two air supply ports for secondary air inflow on the bending portion along the circumferential direction interval, compared with prior art, the advantages of the present application are that: since the outer end of the upper layer cover has the extension edge extending to the outer cover, and has the bending portion of bending downwards on the extension edge, relative to secondary air, it can be blocked by bending portion and accelerate the speed of entering air supply port, relative to flue gas, it can be turned in bending portion and occur vortex with secondary air and carry out heat exchange, finally play the role of heating secondary air.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of household kitchen utensils, in particular to a heat shield for a gas stove and a gas stove using the heat shield. BACKGROUND

[0002] In the actual use process of the existing gas stove, since the pot is placed on the pot support for heating, there is a certain space interval between the pot and the burner, so that a considerable part of the heat energy generated by the gas combustion escapes into the surrounding environment, causing energy waste; in order to solve the above problem, in recent years, some heat collecting and energy concentrating structures have appeared in China, such as the Chinese invention "A heat shield for a gas stove and a gas stove using the heat shield" (Patent No. CN213777859U) applied by the applicant, which comprises a ring-shaped shield body, a ring-shaped cavity is formed in the center of the shield body, the shield body is double-layered and has a cavity, air inlet holes are formed on the outer wall or the bottom wall of the shield body for allowing outside air to flow into the cavity, the top surface of the shield body has a ring-shaped inner step, and a first wall surface above the ring-shaped inner step is provided with air outlet holes in a circumferential direction for allowing the preheated secondary air to flow out of the ring-shaped cavity and the cavity and provide the burner with the preheated secondary air, so as to avoid the secondary air between the inner ring and the outer ring and improve the utilization rate of gas.

[0003] Although the heat shield can provide preheated secondary air, it cannot independently provide preheated secondary air for the inner ring or the outer ring of the burner, but how to improve the preheating of the secondary air of the inner ring, the outer ring and even the inner, outer and middle three rings is still worth further research.

[0004] On the other hand, in addition to improving the combustion efficiency of the burner of the gas stove by the heat shield, whether the burner itself can improve its combustion effect, and the infrared gas stove with integrated combustion radiation plate is one of the ways, which has the advantages of energy saving, no pot fumigation, low content of carbon monoxide and nitrogen oxides in the flue gas discharged during combustion, etc. It has been loved by some consumers for many years. However, for a long time, the infrared gas stove has the following disadvantages, which affects its large-scale promotion and use: the combustion radiation plate needs to be made of materials with some specific properties, which are more prone to damage than the fire cover of the traditional atmospheric gas stove, and in order to seal, the combustion radiation plate also needs to be fastened together with the burner head by a special method, which is very troublesome to maintain and replace, and needs to be further improved. SUMMARY

[0005] The first technical problem to be solved by the present application is to provide a gas stove with a secondary air preheating efficiency improved and secondary air reasonably distributed to burners.

[0006] The second technical problem to be solved by the present application is to provide a burner for a gas stove with improved efficiency and easy installation.

[0007] To solve the first technical problem, the present application adopts the technical solution as follows: the gas stove comprises a ring-shaped cover body, the cover body is a double-layer structure comprising an upper cover and a lower cover, a first cavity is formed between the upper cover and the lower cover, an outer cover is arranged at the periphery of the lower cover, a ring-shaped cavity is formed in the center of the cover body, a second cavity between the outer cover and the lower cover is in communication with the ring-shaped cavity and the outside, and the second cavity serves as a second air supplementing cavity, characterized in that: a partition plate is arranged between the upper cover and the lower cover, the inner periphery of the partition plate extends out of the first cavity between the upper cover and the lower cover, and the first cavity is divided into a first air supplementing cavity in communication with the ring-shaped cavity and the outside, a preheating cavity between the first air supplementing cavity and the second air supplementing cavity, and the like.

[0008] a base;

[0009] a central gas mixing chamber arranged in the center of the base;

[0010] an outer ring gas mixing chamber also arranged on the base and located at the periphery of the central gas mixing chamber, and a gas supplementing ring cavity is formed between the central gas mixing chamber and the outer ring gas mixing chamber;

[0011] a plurality of radial secondary air supplementing channels for connecting the gas supplementing ring cavity and the second air supplementing cavity are arranged on the base in a circumferential direction at intervals, the inner periphery of the partition plate abuts against the base, and the first air supplementing cavity is in communication with the fire outlet area of the outer ring fire cover.

[0012] To improve the preheating of secondary air in the lower cover, preferably, the lower cover is at least partially provided with a concave-convex structure for preheating secondary air. The secondary air can stay in the concave-convex structure for a long time, thereby improving the preheating efficiency.

[0013] To preheat the secondary air closer to the position of the burner, preferably, the cross section of the lower cover is in the shape of a "U", comprising an outer side wall, an inner side wall, and a connecting wall connecting the outer side wall and the inner side wall, the connecting wall is arranged horizontally, and the concave-convex structure is arranged on the connecting wall.

[0014] In order to make the secondary air entering the second air supplement cavity more concentrated, preferably, the upper cover extends outwardly beyond the outer periphery of the outer cover from the outer end edge of the annular cavity to an extension edge, the extension edge has a downwardly bent bending portion and at least two first air inlets for the secondary air flowing into the second air supplement cavity are spaced apart circumferentially on the bending portion, and the outer cover is recessed inwardly in the direction of the concave-convex structure to form a concave cavity, and one of the walls of the concave cavity is provided with a second air inlet for the secondary air flowing into the second air supplement cavity.

[0015] After the secondary air entering the second air supplement cavity is concentrated by the concave cavity, the speed of the secondary air entering the second air supplement cavity is faster, and finally the secondary air preheated by the concave-convex structure flows out to the burner to supplement the preheated secondary air to the burner, thereby improving the combustion efficiency of the burner; in addition, since the heat shield includes an annular cover body, the cover body is a double-layer structure composed of an upper cover and a lower cover, and the first cavity is formed between the upper cover and the lower cover, thereby blocking the downward transmission of heat from the upper cover to the lower cover, and the lower cover and the outer cover concentrate the radiant heat energy in the combustion process of the burner to preheat the secondary air entering through the second air inlet; in addition, since the outer end edge of the upper cover has an extension edge extending to the outer cover and a downwardly bent bending portion on the extension edge, the secondary air is blocked by the bending portion to accelerate the speed of entering the first air inlet, and the flue gas is turned at the bending portion to generate vortex with the secondary air to exchange heat, thereby finally heating the secondary air, and the heated secondary air enters the first air supplement cavity again for re-preheating and finally flows out, thereby realizing the preheating of the secondary air in the two relatively independent channels.

[0016] In order to realize that the secondary air entering the second air supplement cavity can flow more directly to the second air supplement cavity after being concentrated by the concave cavity, preferably, the wall corresponding to the concave cavity includes a first wall, a second wall and a vertical wall connecting the first wall and the second wall, the second wall is used to rest on the liquid container, and the second air inlet is provided on the vertical wall. Through the second air inlet, the secondary air can flow more easily to the second air supplement cavity.

[0017] In order to facilitate the preheated secondary air in the first air supplement cavity and the second air supplement cavity to flow out, preferably, the upper cover has an inner end edge adjacent to the inner end edge of the annular cavity, a first gap is formed between the inner end edge of the upper cover and the partition plate, the first gap constitutes a first air outlet of the first air supplement cavity, a second gap is formed between the second wall of the concave cavity and the inner end edge of the upper cover, and the second gap constitutes a second air outlet of the second air supplement cavity.

[0018] To solve the second technical problem, preferably, the outer ring gas mixing chamber comprises an inner ring wall, an outer ring wall and a bottom wall connecting the inner ring wall and the outer ring wall, at least two gas inlet holes communicating with the first gas passage are formed in the bottom wall, at least two layers of spaced radiation plates are arranged in the outer ring gas mixing chamber, at least two radiation plate holes are formed in each radiation plate, and the number of the radiation plate holes of each radiation plate gradually increases by 20-40% along the outflow direction of the gas inlet holes. The flame formed by each radiation plate heats the fire cover to a high temperature state, and then transfers heat to the pot in the form of infrared radiation. The cross section and the number of the radiation holes of each radiation plate gradually increase from bottom to top, which can gradually reduce the flue gas flow rate, increase the contact time of each layer of radiation plates with the flue gas, improve the utilization efficiency of the gas, make the combustion process more complete, and thus improve the thermal efficiency.

[0019] Further, to solve the problem that the radiation plate needs to be fastened with the burner head in the prior art, thereby increasing the difficulty of maintenance, preferably, a resting portion for resting each corresponding radiation plate is arranged in the inner ring wall and / or the outer ring wall. Through the arrangement of the resting portion, each radiation plate is detachably connected with the inner ring wall and / or the outer ring wall, thereby facilitating maintenance and replacement.

[0020] From the perspective of simple structure, preferably, the resting portion is a ring-shaped convex edge locally extending in the inner ring wall and / or the outer ring wall. Each radiation plate is rested on the ring-shaped convex edge, which can be arranged only in the inner ring wall or only in the outer ring wall, or arranged in both the inner ring wall and the outer ring wall. The number of the ring-shaped convex edges is selected according to the actual situation of the burner.

[0021] To make the fire cover of the burner a mesh fire cover with fire holes, the mesh fire cover is arched upward in the center, and the second air supplementing cavity communicates with the mesh fire cover and the fire outlet area of the central gas mixing chamber. Since the mesh fire cover is arched upward in the center, it can better mix with the external secondary air on the inner and outer sides in the circumferential direction of the fire cover for secondary combustion, and since the mesh fire cover communicates with the fire outlet area of the central gas mixing chamber, the secondary air provided by the mesh fire cover and the central gas mixing chamber when burning is preheated secondary air, which can effectively improve the combustion efficiency.

[0022] To realize the uniformity of the burner in heating the bottom of the pot, preferably, an outer ring body is further arranged outside the outer ring wall and spaced apart, the first air supplementing cavity communicates with the fire outlet area of the outer ring body, and a first annular gap for fire outlet is formed between the upper end surface of the outer ring body and the outer ring wall. The first air supplementing cavity of the heat shield allows the secondary air supplied to the outer ring body of the burner to be preheated secondary air, which can effectively improve the combustion efficiency.

[0023] Further, the upper end surface of the outer ring body is circumferentially spaced apart with at least two connecting blocks connected with the outer ring wall, and at least two first gas inlets are formed on each connecting block and communicated with the second gas channel. The arrangement of the connecting blocks can make the combination of the outer ring body and the outer ring wall more stable, and the first gas inlets arranged on the connecting blocks can avoid the defect that the part of the first annular gap corresponding to the connecting blocks cannot emit fire.

[0024] Similarly, in order to realize the uniformity of the burner heating the pot bottom, preferably, the outer ring body is further provided with a second annular gap for emitting fire outside the first annular gap, and the outer ring body has at least two second gas inlets communicated with the second annular gap and the second gas channel. Among them, the outer ring body has at least two second gas inlets, which can slow down the speed of the gas flowing out of the second annular gap, so that the second annular gap outside the first annular gap can assist in pulling out the fire of the first annular gap, thereby realizing more stable combustion.

[0025] Compared with the prior art, the advantages of the present application are that: by preheating the cavity, the first air supplement cavity and the second air supplement cavity used for supplementing the inner and outer ring fire emission areas are separated, the upper cover, the lower cover and the outer cover gather the radiant heat energy in the combustion process of the burner to preheat the secondary air flowing into the air supplement cavity, and at the same time, the degree of preheating is independent due to the separation of the preheating cavity, the secondary air of the side air inlet of the inner and outer rings can be more reasonably distributed, and the present application is especially suitable for burners with two-ring fire or three-ring fire. At least one ring in the burner is in a high-temperature state through the flame formed by each radiation plate, and then the heat is transmitted to the pot in the form of infrared radiation. The cross section and the number of radiation holes of each radiation plate gradually increase from bottom to top, which can gradually reduce the flue gas flow rate, increase the contact time of each layer of radiation plate with flue gas, improve the utilization efficiency of gas, make the combustion process more complete, and then improve the thermal efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a front structure diagram of the heat shield in the embodiment of the present application;

[0027] Figure 2 It is a partial sectional view of the heat shield in the embodiment of the present application;

[0028] Figure 3 It is a structure diagram of the heat shield surrounding the burner in the embodiment of the present application;

[0029] Figure 4 It is a sectional view of Figure 3 (the dotted arrow indicates the path of the external secondary air to the outer ring fire cover and the mesh type fire cover air supplement);

[0030] Figure 5 It is a schematic diagram of the burner in the embodiment of the present application;

[0031] Figure 6 For Figure 5 the structure diagram of gas passage is omitted;

[0032] Figure 7 For Figure 6 the sectional view;

[0033] Figure 8 For Figure 6 the exploded structural schematic diagram;

[0034] Figure 9 For Figure 5 the sectional view;

[0035] Figure 10 For Figure 8 the partial structural view. DETAILED DESCRIPTION

[0036] The application will be further described in detail below with reference to the accompanying drawings.

[0037] As Figures 1-10 shown, it is the best embodiment of the present application. The heat shield for stove of the embodiment comprises a ring-shaped shield body 1, which is a double-layer structure composed of an upper shield 11 and a lower shield 12, wherein a first cavity 2 is formed between the upper shield 11 and the lower shield 12, and further comprises an outer shield 13 located at the periphery of the lower shield 12, a ring-shaped cavity 10 is formed in the center of the shield body 1, a second cavity 3 between the outer shield 13 and the lower shield 12 is communicated with the ring-shaped cavity 10 and the outside, serving as a second air supplement cavity, a partition plate 7 is arranged between the upper shield 11 and the lower shield 12, the inner periphery of the partition plate 7 extends out of the first cavity 2 between the upper shield 11 and the lower shield 12, and the first cavity 2 is divided into a first air supplement cavity communicated with the ring-shaped cavity 10 and the outside, and a preheating cavity 4 located between the first air supplement cavity and the second air supplement cavity. The first air supplement cavity and the second air supplement cavity, which are used to supplement the secondary air of the inner and outer ring fire areas respectively, are separated by the preheating cavity 4, the upper shield 11, the lower shield 12 and the outer shield 13 preheat the secondary air flowing into the air supplement ring cavity 80 by gathering the radiant heat energy generated in the combustion process of the burner, and the preheating degree is independent due to the separation of the preheating cavity 4, so that the secondary air of the side air inlet of the inner and outer rings can be distributed more reasonably.

[0038] Specifically, in order to improve the preheating of the secondary air in the lower cover 12, the lower cover 12 of the present embodiment is at least partially provided with a concave-convex structure 120 for preheating the secondary air. The secondary air can stay in the concave-convex structure 120 for a long time, thereby improving the preheating efficiency. In order to make the concave-convex structure 120 closer to the position of the burner to preheat the secondary air, the cross section of the lower cover 12 is designed in a "U" shape, including an outer side wall 121, an inner side wall 122, and a connecting wall 123 connecting the outer side wall 121 and the inner side wall 122, the connecting wall 123 is horizontally arranged, and the concave-convex structure 120 is arranged on the connecting wall 123. In addition, the outer end edge of the upper cover 11 extends outward to the outer periphery of the outer cover 13 beyond the extension edge 5, the extension edge 5 has a bending portion 51 bent downward, and a plurality of first air inlets 52 for the secondary air to flow into the second air supplementing cavity are arranged on the bending portion 51 in a circumferential direction, and the outer cover 13 is recessed inward in the direction of the concave-convex structure 120 to form a concave cavity 6, one of the corresponding wall surfaces of the concave cavity 6 is provided with a second air inlet 61 for the secondary air to flow into the second air supplementing cavity, the arrangement of the concave cavity 6 can make the secondary air entering the second air supplementing cavity more concentrated, and the secondary air entering the second air supplementing cavity after being concentrated by the concave cavity 6 flows faster, and finally the secondary air preheated by the concave-convex structure 120 flows out through the second air outlet, so as to improve the combustion efficiency of the burner; in addition, since the heat shield includes a ring-shaped cover body 1, the cover body 1 is a double-layer structure composed of the upper cover 11 and the lower cover 12, and the first cavity 2 is formed between the upper cover 11 and the lower cover 12, so as to block the heat transfer from the upper cover 11 to the lower cover 12 downward, and the secondary air entering through the second air inlet 61 is preheated by the radiation heat energy of the lower cover 12 and the outer cover 13 during the combustion process of the burner, in addition, the outer end edge of the upper cover 11 has an extension edge 5 extending to the outer cover 13, and the extension edge 5 has a bending portion 51 bent downward, which can block the secondary air to accelerate the speed of entering the first air inlet 52, and can make the flue gas turn at the bending portion 51 to exchange heat with the secondary air to heat the secondary air, finally, the heated secondary air enters the first air supplementing cavity again for preheating, and finally flows out through the first air outlet, so as to realize the preheating of the secondary air in the two relatively independent channels.

[0039] When the secondary air entering the second air supplement cavity flows to the second air supplement cavity directly after gathering in the concave cavity 6, the second air inlet 61 is arranged on the wall surface corresponding to the concave cavity 6. The air inlet of the embodiment includes the first wall surface 62, the second wall surface 63 and the vertical wall 64 connecting the first wall surface 62 and the second wall surface 63, which are arranged in parallel and at intervals with the connecting wall 123. The second wall surface 63 is used to be placed on the liquid container, and the second air inlet 61 is arranged on the vertical wall 64. The secondary air flows to the second air supplement cavity through the second air inlet 61. Finally, in order to facilitate the preheated secondary air in the first air supplement cavity and the second air supplement cavity to flow out, the upper cover 11 has an inner end edge 8 adjacent to the annular cavity 10. The first gap 9 is formed between the inner end edge 8 of the upper cover 11 and the partition plate, and the first gap 9 constitutes the first air outlet of the first air supplement cavity. The second gap 20 is formed between the second wall surface 63 of the concave cavity 6 and the inner end edge 8 of the upper cover 11, and the second gap 20 constitutes the second air outlet of the second air supplement cavity.

[0040] The heat insulation cover for the stove in the embodiment can supply the inner ring fire cover 40 and the fire cover 50 of the burner with preheated secondary air, wherein the burner includes the base 30, the inner ring fire cover 40 arranged above the base 30 and forming the central mixing chamber 60 with the base 30, and the fire cover 50 arranged above the base 30, located at the periphery of the inner ring fire cover 40 and forming the first outer ring mixing chamber 70 with the base 30. The fire cover 50 is a central upwardly arched mesh fire cover. The air supplement cavity 80 is formed between the central mixing chamber 60 and the first outer ring mixing chamber 70. The base 30 is also provided with a plurality of radial secondary air supplement channels 90 for connecting the air supplement cavity 80 and the second air outlet at intervals in the circumferential direction. The inner periphery of the partition plate 7 abuts against the base 30, and the first air outlet communicates with the fire area of the fire cover 50.

[0041] In addition to the secondary air required in the preheating burner combustion process of the heat shield, the embodiment realizes efficient combustion through structural improvement, specifically, the second outer ring mixing chamber 1' includes an inner ring wall 11', an outer ring wall 12', and a bottom wall 13' connecting the inner ring wall 11' and the outer ring wall 12', at least two gas inlet holes 131' are formed in the bottom wall 13' and communicate with the first gas channel 8', at least two layers of radiation plates 3' are arranged in the second outer ring mixing chamber 1', at least two radiation plate holes 31' are formed in each radiation plate 3', and the number of radiation plate holes 31' of each radiation plate 3' gradually increases by 20%-40% along the outflow direction of the gas inlet hole 131'. The flame formed by each radiation plate 3' heats the fire cap 50 to a high temperature state, and then transfers heat to the pot in the form of infrared radiation. At the same time, the high-temperature flue gas also passes through each radiation plate 3' for secondary heating, further increasing the temperature of the flue gas, making the temperature of the flue gas higher, and the step-by-step burning of each radiation plate 3' has a higher temperature than the direct combustion of the flame on the fire cap 50, and the radiation heat efficiency is higher. Therefore, the heat radiation efficiency is higher in the heat exchange process with the pot, and the temperature of the flue gas is higher, and the convective heat transfer efficiency is improved, thereby obtaining higher thermal efficiency. In addition, the cross section and the number of radiation holes of each radiation plate 3' gradually increase from bottom to top, which can gradually reduce the flue gas flow rate, increase the contact time of each layer of radiation plate 3' with the flue gas, and further increase the radiation area of the radiation plate 3. After passing through multiple layers of radiation plates 3', the flue gas flows out of the fire cap 50, and the temperature of the flue gas reaches the highest. At the same time, the flow rate of the flue gas gradually decreases, which can increase the flue gas temperature while increasing the heat exchange time of the flue gas and the pot, thereby improving the thermal efficiency. Finally, since the number of radiation holes of the lowermost radiation plate 3' is small, the combustion mode on the flame base surface is atmospheric combustion, the flame is relatively long, and there is no secondary air supplement, so the fuel in the flue gas is not completely burned. After deceleration through multiple stages of radiation plates 3', the flue gas is supplemented to the root of the uppermost fire cap 50 and mixed with external secondary air for secondary combustion, which improves the utilization efficiency of the gas, makes the combustion process more complete, and further improves the thermal efficiency.

[0042] Specifically, the radiation plate 3' of the present embodiment is provided with two, along the outflow direction of the gas inlet hole 131', the number of radiation plate holes 31' of each radiation plate 3' gradually increases by 30% from bottom to top, and the present embodiment also focuses on solving the problem that the radiation plate 3' needs to be fastened with the burner head together, which increases the difficulty of maintenance. Among them, the inner ring wall 11' and / or the outer ring wall 12' is provided with a resting part 4' for resting the corresponding each radiation plate 3'. Through the setting of the resting part 4', the detachable connection of each radiation plate 3' with the inner ring wall 11' and / or the outer ring wall 12' is realized, which is convenient for maintenance and replacement. From the perspective of simple structure, the resting part 4' is a ring-shaped convex edge locally extending from the inner ring wall 11' and / or the outer ring wall 12'. By resting each radiation plate 3' on the ring-shaped convex edge, the ring-shaped convex edge can be provided only on the inner ring wall 11' or only on the outer ring wall 12', or on both the inner ring wall 11' and the outer ring wall 12'. The number of ring-shaped convex edges is selected according to the actual situation of the burner. In order to make the burner cap 50 be a mesh type fire cap with full fire holes, the mesh type fire cap is arched upward in the center. Because the mesh type fire cap is arched upward in the center, it can better mix with the external secondary air on the inner and outer sides of the circumference of the cap for secondary combustion. The second air supply cavity is in communication with the mesh type fire cap and the fire outlet area of the central mixing chamber 60', which can supply preheated secondary air to it.

[0043] In order to realize the uniformity of the burner heating the pot bottom, the present burner further comprises an outer ring body 5' which is arranged on the outer periphery of the outer ring wall 12' and is arranged at intervals. The upper end surface of the outer ring body 5' and the outer ring wall 12' form a first annular gap 51' for discharging fire. At least two connecting blocks 52' connected with the outer ring wall 12' are arranged at intervals on the upper end surface of the outer ring body 5'. At least two first gas inlet holes 53' in communication with the second gas channel 6' are arranged on each connecting block 52'. The arrangement of each connecting block 52' can make the combination of the outer ring body 5' and the outer ring wall 12' more stable. In addition, the first gas inlet holes 53' arranged on the connecting block 52' can avoid the defect that the part of the first annular gap 51' corresponding to the connecting block 52' cannot discharge fire. Similarly, in order to realize the uniformity of the burner heating the pot bottom, preferably, the outer ring body 5' is further provided with a second annular gap 7' for discharging fire outside the first annular gap 51'. The outer ring body 5' has at least two second gas inlet holes 71' in communication with the second annular gap 7' and the second gas channel 6'. Among them, the at least two second gas inlet holes 71' provided on the outer ring body 5' can slow down the speed of the gas flowing out of the second annular gap 7', so that the second annular gap 7' outside the first annular gap 51' can assist in pulling the fire out of the first annular gap 51', thereby realizing more stable combustion.

[0044] In summary, the present burner combines the ring gap type fire and the radiation type radiation plate 3' fire way, effectively improve the combustion efficiency of the burner, then the mesh type fire cover and the central gas mixing chamber 60' combustion provides secondary air for preheating, can effectively improve its combustion efficiency, combined with the first air supplement cavity of the heat shield, the secondary air supplied to the outer ring body 5' of the burner is preheated, which can effectively improve the combustion efficiency; The external secondary air enters the first air supplement cavity and the second air supplement cavity through the first air supplement port and the second air supplement port, respectively, wherein the inner periphery of the partition plate 7 abuts against the base 30, so that the first air outlet communicated with the first air supplement port provides preheated secondary air to the outer ring body 5' of the fire cover 50, and the second air outlet communicated with the second air supplement port provides preheated secondary air to the mesh type fire cover of the fire cover 50 and the inner ring fire cover 40, finally improving the combustion efficiency.

Claims

1. A gas stove comprising a ring-shaped cover (1) which is a double-layer structure composed of an upper cover (11) and a lower cover (12), a first cavity (2) being formed between the upper cover (11) and the lower cover (12), and further comprising an outer cover (13) located at the periphery of the lower cover (12), a ring-shaped cavity (10) being formed in the center of the cover (1), a second cavity (3) between the outer cover (13) and the lower cover (12) communicating with the ring-shaped cavity (10) and the outside, as a second air supplement cavity, characterized in that: The upper cover (11) and the lower cover (12) are provided with a partition plate (7), the inner periphery of the partition plate (7) extends out of the first cavity (2) between the upper cover (11) and the lower cover (12), and separates the first cavity (2) into a first air supplementing cavity which communicates with the annular cavity (10) and the outside, and a preheating cavity (4) between the first air supplementing cavity and the second air supplementing cavity, and further comprising: ​ a base (30); a central mixing chamber (60) arranged in the center of the base (30); a first outer ring mixing chamber (70) also arranged on the base (30) and located at the periphery of the central mixing chamber (60), and forming an air supplementing ring cavity (80) between the central mixing chamber (60) and the first outer ring mixing chamber (70); a plurality of radial secondary air supplementing channels (90) for communicating the air supplementing ring cavity (80) with the second air supplementing cavity are arranged on the base (30) in a circumferential direction at intervals, the inner periphery of the partition plate (7) abuts against the base (30), the first air supplementing cavity communicates with the fire outlet area of the fire cover (50).

2. Gas hob according to claim 1, characterized in that The lower cover (12) is at least partially provided with a concave-convex structure (120) for preheating secondary air.

3. Gas hob according to claim 2, characterized in that The cross section of the lower cover (12) is in the shape of "U", comprising an outer side wall (121), an inner side wall (122), and a connecting wall (123) connecting the outer side wall (121) and the inner side wall (122), the connecting wall (123) is arranged horizontally, and the concave-convex structure (120) is arranged on the connecting wall (123).

4. Gas hob according to claim 3, characterized in that The outer end edge of the upper cover (11) away from the annular cavity (10) extends to the outer periphery of the outer cover (13) to form an extension edge (5), the extension edge (5) has a bending part (51) bent downward, and at least two first air inlets (52) for the secondary air to flow into the second air supplementing cavity are arranged on the bending part (51) in a circumferential direction at intervals, and the outer cover (13) is recessed inward in the direction of the concave-convex structure (120) to form a recessed cavity (6), one of the corresponding wall surfaces of the recessed cavity (6) is provided with a second air inlet (61) for the secondary air to flow into the second air supplementing cavity.

5. The gas hob according to claim 4, characterized in that: The corresponding wall surface of the recessed cavity (6) comprises a first wall surface (62) parallel to and spaced apart from the connecting wall (123), a second wall surface (63), and a vertical wall (64) connecting the first wall surface (62) and the second wall surface (63), the second wall surface (63) is used to rest on a liquid container, and the second air inlet (61) is arranged on the vertical wall (64).

6. Gas hob according to claim 5, characterized in that The upper cover (11) has an inner end edge (8) adjacent to the annular cavity (10), a first gap (9) is formed between the inner end edge (8) of the upper cover (11) and the partition plate (7), the first gap (9) constitutes a first air outlet of the first air supplementing cavity, a second gap (20) is formed between the second wall surface (63) of the recessed cavity (6) and the inner end edge (8) of the upper cover (11), and the second gap (20) constitutes a second air outlet of the second air supplementing cavity.

7. Gas hob according to claim 5 or 6, characterized in that: The second outer ring gas mixing chamber (1') comprises an inner ring wall (11'), an outer ring wall (12') and a bottom wall (13') connecting the inner ring wall (11') and the outer ring wall (12'), wherein the bottom wall (13') is provided with at least two gas inlet holes (131') communicating with the first gas channel (8'), and the second outer ring gas mixing chamber (1') is provided with at least two layers of spaced radiation plates (3'), each radiation plate (3') is provided with at least two radiation plate holes (31'), and the number of the radiation plate holes (31') of each radiation plate (3') gradually increases by 20%-40% along the outflow direction of the gas inlet holes (131').

8. Gas hob according to claim 7, characterized in that The inner ring wall (11') and / or the outer ring wall (12') is provided with a resting portion (4') for resting each corresponding radiation plate (3').

9. The gas hob according to claim 8, characterized in that: The resting portion (4') is a ring-shaped convex edge locally extending in the inner ring wall (11') and / or the outer ring wall (12').

10. The gas hob according to claim 9, characterized in that: The inner ring wall (11') and the outer ring wall (12') of the second outer ring gas mixing chamber (1') are covered with a fire cover (50), which is a mesh-type fire cover with fire holes, the central part of the mesh-type fire cover is arched upward, the second gas supplement cavity communicates with the mesh-type fire cover and the fire outlet area of the central gas mixing chamber (60').

11. The gas hob according to any one of claims 8 to 10, characterized in that: Further comprising an outer ring body (5') located outside the outer ring wall (12') and spaced apart, the first gas supplement cavity communicates with the fire outlet area of the outer ring body, and a first annular gap (51') for fire outlet is formed between the upper end surface of the outer ring body (5') and the outer ring wall (12').

12. The gas hob according to claim 11, characterized in that: The upper end surface of the outer ring body (5') is circumferentially spaced apart and provided with at least two connecting blocks (52') connected with the outer ring wall (12'), each connecting block (52') is provided with at least two first gas inlet holes (53') communicating with the second gas channel (6').

13. The gas hob according to claim 12, characterized in that: The outer ring body (5') is further provided with a second annular gap (7') for fire outlet outside the first annular gap (51'), and the outer ring body (5') is provided with at least two second gas inlet holes (71') communicating with the second annular gap (7') and the second gas channel (6').

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