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

Abstract

The 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 a double-layer structure consisting of an upper cover and a middle cover, a cavity is formed between the upper cover and the middle cover, and also comprises a lower cover located below the middle cover, the bottom wall of the lower cover at least partially has at least two vertical preheating plates distributed along the circumferential direction at intervals, the lower cover is provided with an air supply port for supplying air to a burner located in the central hole at a position corresponding to the vertical preheating plates. Compared with the prior art, the advantage of the invention is that the heat insulation cover comprises an annular cover body, the cover body is a double-layer structure consisting of an upper cover, a middle cover and a lower cover, a cavity is formed between the upper cover and the middle cover, so that the upper cover can be blocked from transferring heat downward to the middle cover, and the middle cover gathers the radiant heat energy in the combustion process of the burner and conducts it downward to the vertical preheating plates, so as to preheat the air entering through the air supply port.

Description

Technical Field

[0001] The invention relates to the field of household kitchenware, and in particular to a heat insulation cover for a stove and a gas stove having the heat insulation cover for the stove. Background Art

[0002] In actual use of existing gas stoves, since the pot is placed on the 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 problems, some heat-collecting and energy-gathering devices have appeared in China in recent years, such as "Energy-gathering ring for gas stove and gas stove with it" disclosed in Chinese patent CN203404823U, and "A kind of energy-gathering gas stove" disclosed in Chinese patent CN204042984U, which also has an energy-gathering pot support. Although the above-mentioned energy-gathering ring structure can reduce the consumption of heat energy to a certain extent, the applicant has proposed a stove heat insulation cover that combines the pot support and the energy-gathering ring structure. Structure, such as the invention patent with patent number ZL201711260487.7 (authorization announcement number CN109869782U) "A heat insulation cover for stove and stove using the heat insulation cover for stove" discloses a kind of annular cover body, the cover body is a double-layer structure composed of an upper cover and a lower cover, a cavity is formed between the upper cover and the lower cover, the upper surface of the upper cover is fixed with pot feet arranged at intervals along the circumferential direction, and the heat insulation cover is fixed with built-in pot feet, so that the heat absorbed by the pot feet can heat the bottom of the pot as much as possible through heat conduction while reducing the heat loss of the flame, but the heat insulation cover for stove and the burner in the stove are independent components. If the user wants to clean the panel of the stove during cleaning, he needs to take out the heat insulation cover for stove and clean the burner.

[0003] If the gas burner of the existing household gas stove includes a mixing chamber, a fire cover, an ejector tube, etc., the burner mixing chamber is a very important component of the stove. The function of the mixing chamber is to mix the gas so that the gas and the primary air are mixed more evenly; at the same time, the secondary air is supplied to the inner ring. The current integrated fixed structure of the mixing chamber is not conducive to the cleaning of the stove. For example, the Chinese utility model patent No. ZL201420072885 (Announcement No. CN2037314112U) Burner", or Chinese invention patent No. ZL200610052382.8 (publication No. CN1884911A), or patent No. ZL201410209837.7 (publication No. CN103994436B) "upper air intake burner for gas stove" all disclose a similar gas mixing chamber, such as the upper air intake burner for gas stove includes a base, a gas mixing chamber, an outer ring fire cover, an inner ring fire cover and a gas pipe seat. Among them, the base has a concave cavity with an opening facing upward at the upper part, the mixing chamber is arranged above the base and has an annular cavity, the inner ring fire cover and the outer ring fire cover are arranged above the mixing chamber and are respectively located on the inner and outer sides of the annular cavity, and the side of the mixing chamber is provided with secondary air holes, which are communicated with the annular cavity to form a secondary air channel. In addition, the fire hole of the inner ring fire cover faces the annular cavity, so the secondary air channel is used to supplement the secondary air of the inner ring fire to make the inner ring fire burn more fully. However, since the mixing chamber is an integrated type, soup overflow is easy to remain in the annular cavity, which is not only not conducive to the cleaning of the burner, but also the overflow is easy to be burned dry by the inner ring fire, making the annular cavity black. Summary of the invention

[0004] The first technical problem to be solved by the present invention is to provide a stove heat insulation cover capable of providing the burner with the required preheated lateral air in view of the above-mentioned prior art status.

[0005] The second technical problem to be solved by the present invention is to provide a stove heat insulation cover capable of providing preheated lateral primary air to the burner in view of the above-mentioned existing technical status.

[0006] The third technical problem to be solved by the present invention is to provide a stove heat insulation cover capable of providing preheated lateral secondary air to the burner in view of the above-mentioned existing technical status.

[0007] The fourth technical problem to be solved by the present invention is to provide a gas stove having the above-mentioned stove heat insulation cover which is easy for users to clean in view of the above-mentioned existing technical status.

[0008] The fifth technical problem to be solved by the present invention is to provide a gas stove having the above-mentioned stove heat insulation cover, which can provide smooth lateral secondary air to the burner in view of the above-mentioned existing technical status.

[0009] In order to solve the first technical problem, 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 a double-layer structure composed of an upper cover and a middle cover, and a cavity is formed between the upper cover and the middle cover, and is characterized in that: it also includes a lower cover located below the middle cover, the bottom wall of the lower cover at least partially has at least two vertical preheating fins distributed along the circumferential direction, and the lower cover is provided with an air supply port for supplying air to the burner located in the central hole at a position corresponding to the vertical preheating fins.

[0010] To solve the second technical problem, preferably, the bottom wall of the lower cover has a first outer wall and a first inner wall extending in the circumferential direction, the two are radially spaced from each other to form a primary air preheating chamber, and the first outer wall has an air inlet allowing outside air to flow into the primary air preheating chamber. The structure of the lower cover can be various, such as S-shaped or irregular, and the lower cover in the technical solution is annular. The low pressure caused by the gas injection from the air supply part is then used to introduce the primary air into the primary air preheating chamber from the air inlet by means of the kinetic energy of the combustion gas itself. Since the upper cover and the middle cover are closed cavities, the heat transfer from the upper cover to the middle cover can be blocked. The reason is that there is enough still air layer between the upper cover and the middle cover to insulate and avoid convective heat transfer losses caused by large-scale air flow, and the lower cover is an open cavity, which can make the air in the lower cover flow slightly, and can reduce the heat accumulated in the middle cover during the combustion process and transferred to the lower cover. The middle cover will still inevitably transfer the heat downward to the lower cover during the combustion process, thereby preheating the primary air entering through the air inlet to improve the thermal efficiency of the burner. At the same time, it can reduce the heat transferred downward from the lower cover to the panel or the liquid tray, which is not easy to cause the temperature rise problem of the panel.

[0011] Furthermore, the primary air preheating chamber is provided with the vertical preheating fins. In order to avoid the low pressure caused by the gas injection through the air supply part, the primary air is then introduced into the primary air preheating chamber from the air inlet by the kinetic energy of the gas itself, and the primary air flows into the primary air preheating chamber too fast, and the primary air cannot be fully preheated. The vertical preheating fins can increase the exchange path and exchange time between the primary air and the vertical preheating fins, and the preheated primary air flows into the burner for combustion, that is, the intake temperature of the primary air required for combustion is increased, thereby increasing the actual combustion temperature of the burner, thereby improving the thermal efficiency of the gas cooker and saving gas.

[0012] To solve the third technical problem, preferably, the first outer side wall and the first inner side wall are both C-shaped, and the two are connected at the corresponding ends by the radial first connecting wall and the second connecting wall, respectively. The lower cover forms a secondary air preheating cavity on the periphery of the peripheral wall of the primary air preheating cavity, and the preheating plate is arranged therein. In order to realize that the lower cover can preheat the primary air and the secondary air at the same time, the lower cover is divided into a primary air preheating cavity and a secondary air preheating cavity, so as to preheat the primary air and the secondary air respectively, and the secondary air is preheated through the secondary air preheating cavity, and the exchange path and exchange time of the secondary air and the first preheating plate are determined, and the preheated primary air flows into the burner for combustion, that is, the intake temperature of the secondary air required for combustion is increased, thereby increasing the actual combustion temperature of the burner, thereby improving the thermal efficiency of the gas cooker and saving gas.

[0013] To solve the fourth technical problem, preferably, the present invention provides a gas stove using the above stove heat insulation cover, including the burner, characterized in that: the burner includes:

[0014] An outer base having an outer ring gas passage, wherein the bottom wall of the lower cover has a portion extending toward the central hole and forming the bottom of the outer base; and

[0015] The outer ring fire cover is arranged on the outer base and forms an outer ring gas mixing chamber with the outer base. Since the lower cover extends toward the central hole, the heat insulation cover and the burner can be integrally formed. When the heat insulation cover and the burner are taken out, only the panel is left, which is convenient for users to clean.

[0016] Since the secondary air replenishment method of the existing burner's side air intake is mainly for the inner ring area, if a heat insulation cover is added outside the burner, it is easy to block the secondary air replenishment of the outer fire hole of the outer ring fire cover. For this reason, further, the outer base includes an inner circumferential wall and an outer circumferential wall arranged with inner and outer intervals, and the inner circumferential wall, the outer circumferential wall and the bottom wall of the lower cover together form the outer ring gas channel, and the outer ring fire cover includes an annular top wall and an outer ring wall and an inner ring wall extending vertically or obliquely downward from the outer edge and the inner edge of the annular top wall, the outer ring wall is provided with external fire holes at intervals along the circumferential direction, and the secondary air preheating chamber corresponds to the fire outlet area of ​​the external fire hole. The size of the secondary air preheating chamber and the primary air preheating chamber can be adjusted according to the combustion load of the burner. The secondary air is preheated through the secondary air preheating chamber. The exchange path and exchange time of the secondary air and the first preheating plate are improved, and the preheated primary air flows into the burner for combustion, which increases the intake temperature of the secondary air required for combustion, thereby increasing the actual combustion temperature of the burner, thereby improving the thermal efficiency of the gas cooker and saving gas.

[0017] To solve the fifth technical problem, preferably, a buffer cavity is further included between the lower cover and the outer base, and the second connecting wall of the lower cover has an air outlet for the secondary air in the secondary air preheating cavity to flow into the buffer cavity. To avoid the secondary air replenishment flow rate being too fast, thereby "blowing out" the outer fire holes of the outer ring fire cover, the setting of the buffer cavity can slow down the flow rate of the secondary air flowing into the secondary air preheating cavity and then flowing to the outer ring fire cover.

[0018] In order to achieve the secondary air to flow slowly and evenly to the outer ring fire cover, a partition is further provided in the buffer cavity, and the partition divides the buffer cavity into two relatively independent first buffer cavity located on the outside and second buffer cavity located on the inside, the first buffer cavity is larger than the second buffer cavity, and the partition is provided with a connecting port connecting the first buffer cavity and the second buffer cavity. The first buffer cavity mainly plays the role of slowing down the flow rate, while the second buffer cavity can make the secondary air buffered by the first buffer cavity flow more evenly to the outer fire holes arranged along the circumference of the outer ring fire cover, so that the outer fire holes of the outer ring fire cover burn more evenly.

[0019] In order to make the outer ring fire cover have double ring fire, preferably, the inner ring wall of the outer ring fire cover is provided with middle fire holes connected to the outer ring air mixing chamber at intervals along the circumferential direction.

[0020] In order to realize that the gas supply part supplies gas to the outer ring gas channel of the burner, preferably, it also includes an outer ejector pipe connecting the outer ring gas channel and the gas supply part, and the gas inlet end of the outer ejector pipe is correspondingly arranged at the recessed part of the lower cover. When the heat insulation cover and the burner are taken out, only the gas supply part on the panel is left, which is convenient for users to clean. In addition, the recessed part can shield the gas supply part from overflow.

[0021] In order to provide the burner with inner and outer double ring fires to meet the needs of users, preferably, the burner also includes:

[0022] An inner base, arranged on the inner periphery of the outer base, having an inner ring gas passage;

[0023] An inner ring fire cover is disposed on the inner base and forms an inner ring gas mixing chamber with the inner base; and

[0024] The connecting rods are at least two in number, with fixed ends connected to the inner wall surface of the outer ring fire cover and free ends extending to the inner base.

[0025] In order to enable the air supply part to supply air to the inner ring gas channel of the burner, preferably, it also includes an inner ejector pipe connecting the inner ring gas channel and the air supply part, the inner ejector pipe radially penetrates the outer ring gas mixing chamber, and the recessed part of the lower cover has an air inlet corresponding to the inner ejector pipe.

[0026] In order to avoid the setting of the outer nozzle affecting the introduction of external primary air by the inner nozzle, preferably, the air supply part is a nozzle seat, and the nozzle seat is provided with an outer nozzle connected to the air inlet end of the outer injection tube and an inner nozzle connected to the air inlet end of the inner injection tube, and a primary air port for the entry of primary air is provided between the outer nozzle and the inner nozzle.

[0027] Compared with the prior art, the advantage of the present invention is that the heat insulation cover includes an annular cover body, which is a double-layer structure composed of an upper cover, a middle cover and a lower cover. A cavity is formed between the upper cover and the middle cover, which can block the upper cover from transferring heat downward to the middle cover, and the middle cover gathers the radiant heat energy during the combustion of the burner and conducts it downward to the vertical preheating plate, preheating the air entering through the air supply port to provide preheated air to the burner, and the preheated air flows into the burner for combustion, that is, the intake temperature of the air required for combustion is increased, thereby increasing the actual combustion temperature of the burner, thereby improving the thermal efficiency of the gas stove and saving gas. In addition, the heat insulation cover can also recycle the heat conducted to the stove panel or the liquid tray, thereby improving the thermal efficiency of the burner while avoiding causing the temperature rise of the stove panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the front structure of the gas stove in Embodiment 1 of the present invention;

[0029] Figure 2 for Figure 1 Schematic diagram of the decomposition structure;

[0030] Figure 3 for Figure 1 A cross-sectional view at an angle;

[0031] Figure 4 for Figure 1 A cross-sectional view from another angle;

[0032] Figure 5 for Figure 1 Schematic diagram of the structure from another angle;

[0033] Figure 6 Schematic diagram of the structure of the air supply unit in Example 1 of the present invention;

[0034] Figure 7 This is a schematic diagram of the structure of the lower cover body in Example 1 of the present invention. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below with reference to the accompanying drawings.

[0036] Example 1

[0037] like Figures 1 to 7The best embodiment of the present invention is shown in the figure. The gas stove of the present embodiment includes a burner and a heat insulation cover 1 arranged around the outer periphery of the burner, the heat insulation cover 1 includes an annular cover body, the cover body includes a double-layer structure consisting of an upper cover 11 and a middle cover 12, a cavity 13 is formed between the upper cover 11 and the middle cover 12, and also includes a lower cover 14 located below the middle cover 12, the bottom wall 141 of the lower cover 14 extends inward to form the bottom of the burner, and the bottom wall 141 of the lower cover 14 partially has at least two first preheating plates 2 extending upward in the circumferential direction and at intervals, and the lower cover 14 is provided with an air supply port 142 for supplying air to the burner at a position corresponding to the first preheating plate 2. In addition, the heat insulation cover 1 can also recycle the heat conducted to the stove panel 3 or the liquid tray, thereby improving the thermal efficiency of the burner and avoiding causing the temperature rise of the stove panel 3.

[0038] The specific gas stove also includes a panel 3, on which is provided an air supply portion 4 for providing mixed gas to the burner, and the lower cover 14 has a recessed portion 143 which is recessed inwardly in the radial direction and accommodates the air supply portion 4 at a position corresponding to the air supply portion 4. Since the bottom wall 141 of the lower cover 14 of the heat insulation cover 1 extends inwardly to form the bottom of the burner, the lower cover 14 is integrally arranged with the burner, so that when the heat insulation cover 1 and the burner are taken out, only the air supply portion 4 on the panel 3 is left, which is convenient for users to clean. In addition, the cover body of the heat insulation cover 1 has a recessed portion for accommodating the air supply portion 4, which can effectively avoid the influence of overflow on the air supply portion 4. At the same time, the heat insulation cover 1 can recycle the heat conducted to the stove panel 3 or the liquid tray, thereby improving the thermal efficiency of the burner and avoiding causing the temperature rise of the stove panel 3. In order to provide preheated lateral primary air to the burner, it also includes a primary air preheating chamber 144 connected to the air supply part 4, and the primary air preheating chamber 144 is directly formed in the lower cover 14, wherein the primary air preheating chamber 144 includes a C-shaped first outer wall 1441 and a C-shaped first inner wall 1442, and the corresponding ends of the two are respectively connected by a first connecting wall 1443 and a second connecting wall 1444, and the first outer wall 1441 has an air inlet 1444a for letting the outside air flow into the primary air preheating chamber 144, wherein the primary air preheating chamber 144 is divided into two primary air sub-preheating chambers 1440 by the air supply part 4, and the primary air is introduced into the primary air preheating chamber 144 from the air inlet 1444a by the kinetic energy of the gas itself through the low pressure caused by the gas injection of the air supply part 4. Since the upper cover 11 and the middle cover 12 are closed cavities 13, the heat transfer from the upper cover 11 to the middle cover 12 can be blocked, and the lower cover 14 is an open cavity 13, which can make the air in the lower cover 14 flow slightly. On the one hand, it can reduce the heat accumulated by the upper cover 11 during the combustion process and conduct it to the lower cover 14. On the other hand, the lower cover 14 collects the heat conducted by the upper cover 11 and conducts it downward to the lower cover 14, preheating the air entering through the air inlet 1444a to improve the thermal efficiency of the burner. At the same time, it can reduce the heat conducted downward by the lower cover 14 to the panel 3 or the liquid tray, and it is not easy to cause the temperature rise problem of the panel 3. The reason is that there is enough static air layer between the upper cover 11 and the lower cover 14 to insulate and avoid the convective heat exchange loss caused by the large-scale flow of air. More preferably, at least two second preheating plates 6 are also arranged circumferentially in the primary air preheating cavity 144.In order to avoid the low pressure caused by the gas injection through the air supply part 4, the primary air is introduced into the primary air preheating chamber 144 from the air inlet 1444a by the kinetic energy of the gas itself. The primary air flows into the primary air preheating chamber 144 too fast and cannot be fully preheated. The second preheating plate 6 can increase the exchange path and exchange time between the primary air and the second preheating plate 6. The preheated primary air flows into the burner for combustion, which increases the intake temperature of the primary air required for combustion, thereby increasing the actual combustion temperature of the burner, thereby improving the thermal efficiency of the gas cooker and saving gas.

[0039] In addition, the outer wall of the lower cover 14, except the second outer wall 145 of the first outer wall 1441, and the inner wall of the lower cover 14, except the second inner wall 146 of the first inner wall 1442, together with the first connecting wall 1443 and the second connecting wall 1444, form a secondary air preheating chamber 147 surrounding the first preheating plate 2. The secondary air is preheated through the secondary air preheating chamber 147, and the exchange path and exchange time between the secondary air and the first preheating plate 2 are increased. The preheated primary air flows into the burner for combustion, that is, the intake temperature of the secondary air required for combustion is increased, thereby increasing the actual combustion temperature of the burner, thereby improving the thermal efficiency of the gas cooker and saving gas. In order to realize the integral molding of the heat insulation cover 1 and the burner, the burner includes an outer base 7 with an outer ring gas channel 71, and the bottom wall 141 of the lower cover 14 extends inward to form the bottom of the outer base 7; and an outer ring fire cover 8 is arranged on the outer base 7 and forms an outer ring gas mixing chamber 81 with the outer base 7. Since the secondary air replenishment method of the existing burner's side air intake is mainly for the inner ring area, if an insulating cover 1 is added outside the burner, it is easy to block the secondary air replenishment of the outer fire hole 821 of the outer ring fire cover 8. For this reason, further, the outer base 7 includes an inner circumferential wall 72 and an outer circumferential wall 73 arranged at inner and outer intervals, and the inner circumferential wall 72, the outer circumferential wall 73 and the bottom wall 141 of the lower cover 14 together form an outer ring gas channel 71, and the outer ring fire cover 8 includes an annular top wall 81 and an outer ring wall 82 and an inner ring wall 83 extending vertically or obliquely downward from the outer edge and inner edge of the annular top wall 81, the outer ring wall 82 is provided with outer fire holes 821 at intervals along the circumferential direction, and the secondary air preheating chamber 147 corresponds to the fire outlet area of ​​the outer fire hole 821. The size of the secondary air preheating chamber 147 and the primary air preheating chamber 144 can be adjusted according to the combustion load of the burner. The secondary air is preheated through the secondary air preheating chamber 147. The exchange path and exchange time of the secondary air and the first preheating plate 2, the preheated primary air flows into the burner for combustion, that is, the intake temperature of the secondary air required for combustion is increased, thereby increasing the actual combustion temperature of the burner, thereby improving the thermal efficiency of the gas cooker and saving gas. Among them, there is also a buffer chamber 9 between the lower cover 14 and the outer base 7, and the second connecting wall 1444 of the lower cover 14 has an outlet 1444b for the secondary air in the secondary air preheating chamber 147 to flow into the buffer chamber 9. In order to avoid the secondary air replenishment flow rate being too fast, which would cause the fire hole 821 outside the outer ring fire cover 8 to be "blown out", the buffer chamber 9 is provided to slow down the flow rate of the secondary air flowing into the secondary air preheating chamber 147 and then flowing to the outer ring fire cover 8. A partition 10 is provided in the buffer chamber 9. The partition 10 of this embodiment is an annular partition plate. The partition 10 divides the buffer chamber 9 into two relatively independent, first buffer chamber 91 located on the outside and second buffer chamber 92 located on the inside. The first buffer chamber 91 is larger than the second buffer chamber 92, and the partition 10 is provided with a connecting port 101 connecting the first buffer chamber 91 and the second buffer chamber 92.The first buffer chamber 91 mainly serves to slow down the flow rate, while the second buffer chamber 92 serves to make the secondary air buffered by the first buffer chamber 91 flow more evenly to the outer fire holes 821 arranged along the circumferential direction of the outer fire cover 8, so that the outer fire holes 821 of the outer fire cover 8 burn more evenly. In order to make the outer fire cover 8 have double rings, the inner ring wall 83 of the outer fire cover 8 is provided with middle fire holes 831 connected to the outer ring gas mixing chamber 81 at intervals along the circumferential direction. In order to realize the gas supply from the gas supply part 4 to the outer ring gas channel 71 of the burner, an outer ejector pipe 20 connecting the outer ring gas channel 71 and the gas supply part 4 is also included, and the gas inlet end 201 of the outer ejector pipe 20 is correspondingly arranged at the recessed part 143 of the lower cover 14. The outer ejector tube 20 is arranged in the lower cover 14, which can reduce the problem that the volume of the burner is too large when combined with the heat insulation cover 1. Specifically, the outer ring mixing chamber 81 can also be designed as two independent mixing chambers, such as dividing the mixing chamber into a first outer ring mixing chamber 811 located on the inner side and a second outer ring mixing chamber 812 located on the outer side by a vertical plate. The outer ring fire cover 8 can have a first outer fire hole 821 corresponding to the first outer ring mixing chamber 811 and a second outer fire hole 821 corresponding to the second outer ring mixing chamber 812. In order to enable the user to individually control the first outer fire hole 821 of the outer ring fire cover 8 The middle ring fire is formed by the hole 821, and the outer ring fire is formed by the second outer fire hole 821, and the outer injector pipe 20 is also divided into a first outer injector pipe 20 connected to the first outer ring mixing chamber 811 and a second outer injector pipe 20 connected to the second outer ring mixing chamber 812. The mixed gas of the first outer ring mixing chamber 811 is directly supplied by the first outer injector pipe 20, and the mixed gas of the second outer ring mixing chamber 812 is directly supplied by the second outer injector pipe 20, and is separated from the fluids of the first outer ring mixing chamber 811 and the second outer ring mixing chamber 812, so that they can be supplied separately.

[0040] In order to enable the burner to have inner and outer double ring fires to meet the user's usage requirements, the burner also includes an inner base 30 arranged on the inner periphery of the outer base 7 and having an inner ring gas channel 301, an inner ring fire cover 40 arranged on the inner base 30 and forming an inner ring mixing chamber 401 between the inner base 30, and also includes at least two connecting rods 50. Taking two connecting rods 50 as an example, the fixed end 501 of each connecting rod 50 is connected to the inner wall surface of the outer ring fire cover 8, and the free end 502 extends to the inner base 30, wherein the inner base 30 and the outer base 7 are connected by the connecting rod 50, which is equivalent to the inner base 30 together with the inner ring fire cover 40 being "suspended" in the center of the outer base 7, omitting the annular cavity formed between the outer ring mixing chamber 81 and the inner ring mixing chamber 401 of the traditional burner, thereby avoiding the phenomenon of the annular cavity becoming black, and making it easier for users to clean. Similarly, in order to realize that the air supply unit 4 supplies air to the inner ring gas passage 301 of the burner, it also includes an inner ejector pipe 60 connecting the inner ring gas passage 301 and the air supply unit 4. The inner ejector pipe 60 radially penetrates the outer ring gas mixing chamber 81, and the recessed part 143 of the lower cover 14 has an air inlet 601 corresponding to the inner ejector pipe 60. Finally, in order to avoid affecting the introduction of external primary air by the inner nozzle 43 due to the setting of the outer nozzle, the air supply unit 4 is a nozzle seat, and the nozzle seat is provided with a first outer nozzle 41 connected to the air inlet end 201 of the first outer ejector pipe 202, a second outer nozzle 42 connected to the air inlet end 201 of the second outer ejector pipe 203, and an inner nozzle 43 connected to the air inlet 601 of the inner ejector pipe 60, and a primary air port 44 for primary air to enter is provided between the first outer nozzle 41 or the second outer nozzle 42 and the inner nozzle 43. In order to make the outer ring fire cover 8 and the inner ring fire cover 40 of the burner burn more fully, the bottom of the lower cover 14 has at least three legs 140, and the intervals between adjacent legs 140 and the panel 3 form an outer ring mixing chamber.

[0041] The inner area of ​​81 and the outer area of ​​the inner annular mixing chamber 401 are supplemented with the secondary air passage 70 of the secondary air.

[0042] As described above, the paths of the primary air, gas, and the mixed primary air and gas required by the burner in the burner are as follows: the primary air enters the primary air preheating chamber 144 from the air inlet 1444a of the lower cover 14, and the low pressure caused by the gas injection from the first outer nozzle 41 to the first outer ring mixing chamber 811 is then introduced into the first outer ring mixing chamber 811 by the kinetic energy of the gas itself, and the primary air and gas are premixed, and finally further mixed in the first mixing chamber. Similarly, the low pressure caused by the gas injection from the second outer nozzle 42 to the second outer ring mixing chamber 812 is then introduced into the second outer ring mixing chamber 812 by the kinetic energy of the gas itself, and the primary air and gas are premixed, and finally further mixed in the second outer ring mixing chamber 812. The mixed primary air and gas finally pass through The air flows out from the first outer fire hole 821 of the outer ring fire cover 8 and is ignited together with the secondary air of the external environment to form a middle ring fire. The mixed primary air and fuel gas finally flow out through the second outer fire hole 820 of the outer ring fire cover 8 and are ignited together with the secondary air of the external environment to form an outer ring fire. In order to enable the user to control the center fire individually, the primary air and fuel gas required for the center fire are input into the inner ring mixing chamber 401 through the inner injector tube 60. At the same time, the inner ring mixing chamber 401 is separated from the fluids of the first outer ring mixing chamber 811 and the second outer ring mixing chamber 812, and then they can be supplied separately. The primary air required by each mixing chamber is preheated by the primary air preheating chamber 144, which can improve the combustion efficiency of the burner. To adjust the size of the outer ring fire, the middle ring fire and the center fire, it is sufficient to adjust the regulating valve connected to the air inlet end of the input channel. The path of the secondary air required by the burner inside the burner is as follows: the secondary air enters the secondary air preheating chamber 147 through the air supply port 142, and the secondary air is preheated by the secondary air preheating chamber 147. The exchange path and exchange time of the secondary air and the first preheating plate 2, the preheated secondary air flows into the buffer chamber 9 between the lower cover 14 and the outer base 7, the second connecting wall 1444 of the lower cover 14 has an outlet 1444b for the secondary air in the secondary air preheating chamber 147 to flow into the first buffer chamber 91, and enters the second buffer chamber 92 through the connecting port 101 after being buffered by the first buffer chamber 91, and finally flows to the outer fire hole 821 of the outer ring fire cover 8, wherein the first buffer chamber 91 mainly plays the role of slowing down the flow rate, and the second buffer chamber 92 can make the secondary air buffered by the first buffer chamber 91 flow more evenly to the outer fire hole 821 of the outer ring fire cover 8 arranged along the circumferential direction, so that the outer fire hole 821 of the outer ring fire cover 8 can burn more evenly.

[0043] Example 2

[0044] The structure is different from that of Example 1 in that the stove heat insulation cover and the burner are separately arranged, that is, the stove heat insulation cover is an independent cover body. In this embodiment, the stove heat insulation cover includes a cover body surrounded by a central hole, and the cover body includes a double-layer structure consisting of an upper cover 11 and a middle cover 12. A cavity 13 is formed between the upper cover 11 and the middle cover 12, and also includes a lower cover 14 located below the middle cover 12. The bottom wall 141 of the lower cover 14 has at least two vertical preheating plates distributed along the circumferential direction at least in part, and the lower cover 14 is provided with an air supply port 142 for supplying air to the burner located in the central hole at the position corresponding to the vertical preheating plates. The cover body of the heat insulation cover 1 is a double-layer structure consisting of an upper cover 11 and a lower cover 14. A cavity 13 is formed between the upper cover 11 and the middle cover 12, which can prevent the upper cover 11 from transferring heat downward to the middle cover 12. The middle cover 12 gathers the radiant heat energy during the combustion of the burner and conducts it downward to the first preheating plate 2, preheating the air entering through the air supply port 142 to provide preheated air to the burner. The preheated air flows into the burner for combustion, which increases the intake temperature of the air required for combustion, thereby increasing the actual combustion temperature of the burner, thereby improving the thermal efficiency of the gas cooker and saving gas. The structure of the lower cover 14 can be of various shapes, such as S-shaped or irregular. In order to preheat the primary air more evenly, the bottom wall 141 of the lower cover 14 has a first outer wall 1441 and a first inner wall 1442 extending in the circumferential direction. The two are radially spaced from each other to form a primary air preheating chamber 144. The first outer wall 1441 has an air inlet 1444a allowing external air to flow into the primary air preheating chamber 144. The lower cover 14 is annular. More preferably, a second preheating plate 6 is provided in the primary air preheating chamber 144. In order to avoid the low pressure caused by the gas injection through the air supply portion 4, the primary air is then introduced into the primary air preheating chamber 144 from the air inlet by the kinetic energy of the gas itself. The primary air flows into the primary air preheating chamber 144 too fast and cannot be fully preheated. The vertical preheating plate can increase the exchange path and exchange time between the primary air and the second preheating plate 6. The preheated primary air flows into the burner for combustion, which increases the intake temperature of the primary air required for combustion, thereby increasing the actual combustion temperature of the burner, thereby improving the thermal efficiency of the gas cooker and saving gas.

[0045] Example 3

[0046] The structure is basically the same as that of Example 2, with the only difference being that: in order to enable the lower cover 14 to preheat the primary air and the secondary air at the same time, the first outer wall 1441 and the first inner wall 1442 are both C-shaped, and the two are connected at the corresponding ends by the radial first connecting wall 1443 and the second connecting wall 1444, respectively. The lower cover 14 is formed with a secondary air preheating cavity 147 on the periphery of the peripheral wall of the primary air preheating cavity 144, and a preheating plate is provided therein. In order to distinguish the vertical preheating plates, the preheating plates in the primary preheating cavity 144 are the second preheating plates 6. The preheating plate in the secondary preheating chamber 147 is the first preheating plate 2, and the lower cover 14 is divided into a primary air preheating chamber 144 and a secondary air preheating chamber 147 to preheat the primary air and the secondary air respectively. The secondary air is preheated by the secondary air preheating chamber 147, and the exchange path and exchange time between the secondary air and the first preheating plate 2 are adjusted. The preheated primary air flows into the burner for combustion, that is, the intake temperature of the secondary air required for combustion is increased, thereby increasing the actual combustion temperature of the burner, thereby improving the thermal efficiency of the gas cooker and saving gas.

Claims

1. A heat insulation cover for a stove, comprising a cover body surrounded by a central hole, the cover body comprising a double-layer structure consisting of an upper cover (11) and a middle cover (12), a cavity (13) being formed between the upper cover (11) and the middle cover (12), characterized in that: The invention also comprises a lower cover (14) located below the middle cover (12), the bottom wall (141) of the lower cover (14) at least partially having at least two vertical preheating fins spaced apart in the circumferential direction, the lower cover (14) being provided with an air supply port (142) for supplying air to the burner located in the central hole at a position corresponding to the vertical preheating fins; the bottom wall (141) of the lower cover having a first outer wall (1441) and a first inner wall (1442) extending in the circumferential direction, the two being spaced apart from each other in the radial direction so as to form a primary air preheating chamber (144), the first outer wall (1441) having an air inlet (1444a) for allowing outside air to flow into the primary air preheating chamber (144).

2. The heat insulation cover for stove according to claim 1, characterized in that: The primary air preheating chamber (144) is provided with the vertical preheating fins.

3. The heat insulation cover for stove according to claim 2, characterized in that: The first outer wall (1441) and the first inner wall (1442) are both C-shaped, and are connected at corresponding ends by a radial first connecting wall (1443) and a second connecting wall (1444), respectively. The lower cover (14) is formed with a secondary air preheating chamber (147) on the periphery of the peripheral wall of the primary air preheating chamber (144), and the vertical preheating fins are provided therein.

4. A gas stove using the stove heat insulation cover as claimed in claim 3, comprising the burner, characterized in that: The burner comprises: The outer base (7) has an outer ring gas channel (71), and the bottom wall (141) of the lower cover (14) has a portion extending toward the central hole and forming the bottom of the outer base (7); as well as An outer ring fire cover (8) is arranged on the outer base (7) and forms an outer ring gas mixing chamber (81) with the outer base (7); It also includes a panel (3), on which is provided an air supply portion (4) for supplying mixed air to the burner.

5. The gas stove according to claim 4, characterized in that: The outer base (7) includes an inner peripheral wall (72) and an outer peripheral wall (73) which are spaced apart from each other. The inner peripheral wall (72), the outer peripheral wall (73) and the bottom wall (141) of the lower cover (14) together form the outer ring gas channel (71). The outer ring fire cover (8) includes an annular top wall and an outer ring wall (82) and an inner ring wall (83) which extend vertically or obliquely downward from the outer edge and the inner edge of the annular top wall. The outer ring wall (82) is provided with external fire holes spaced apart from each other along the circumferential direction. The secondary air preheating chamber (147) corresponds to the fire outlet area of ​​the external fire holes.

6. The gas stove according to claim 5, characterized in that: It also includes a buffer chamber (9) located between the lower cover (14) and the outer base (7), and the second connecting wall (1444) of the lower cover (14) has an outlet (1444b) for the secondary air in the secondary air preheating chamber (147) to flow into the buffer chamber (9).

7. The gas stove according to claim 6, characterized in that: A partition (10) is arranged in the buffer cavity (9), and the partition (10) divides the buffer cavity (9) into two relatively independent first buffer cavity (91) located on the outside and a second buffer cavity (92) located on the inside; the first buffer cavity (91) is larger than the second buffer cavity (92), and the partition (10) is provided with a connecting port (101) connecting the first buffer cavity (91) and the second buffer cavity (92).

8. The gas stove according to claim 7, characterized in that: The inner ring wall (83) of the outer ring fire cover (8) is provided with intermediate fire holes (831) spaced apart along the circumferential direction and communicating with the outer ring gas mixing chamber (81).

9. The gas stove according to any one of claims 5 to 8, characterized in that: It also includes an external ejector pipe connecting the outer ring gas channel (71) and the gas supply part (4), and the gas inlet end (201) of the external ejector pipe is correspondingly arranged at the recessed part (143) of the lower cover (14).

10. The gas stove according to claim 9, characterized in that: The burner also includes: An inner base (30) is arranged on the inner periphery of the outer base (7) and has an inner ring gas channel (301); an inner ring fire cover (40), which is disposed on the inner base (30) and forms an inner ring gas mixing chamber (401) with the inner base (30); and The connecting rod (50) has at least two connecting rods, the fixed end (501) of which is connected to the inner wall surface of the outer ring fire cover (8), and the free end (502) extends to the inner base (30).

11. The gas stove according to claim 10, characterized in that: It also includes an inner ejector pipe (60) connecting the inner ring gas channel (301) and the gas supply portion (4), the inner ejector pipe (60) radially penetrates the outer ring gas mixing chamber (81), and the recessed portion (143) of the lower cover (14) has an air inlet (601) corresponding to the inner ejector pipe (60).

12. The gas stove according to claim 11, characterized in that: The air supply portion (4) is a nozzle seat, on which is provided an outer nozzle connected to the air inlet end (201) of the outer ejector tube (20) and an inner nozzle (43) connected to the air inlet (604) of the inner ejector tube (60), and a primary air port (44) for primary air to enter is provided between the outer nozzle and the inner nozzle (43).

13. The gas stove according to any one of claims 10 to 12, characterized in that: It also includes a panel (3), on which is provided an air supply portion (4) for supplying mixed air to the burner, and the lower cover (14) has a recessed portion (143) for accommodating the air supply portion (4) at a position corresponding to the air supply portion (4).

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