CN111964128B

CN111964128B - Heat shield for stove and gas stove with heat shield

Info

Publication number: CN111964128B
Application number: CN201910416019.7A
Authority: CN
Inventors: 王一婷; 李林; 俞瑜; 郑军妹
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2019-05-19
Filing date: 2019-05-19
Publication date: 2021-12-24
Anticipated expiration: 2039-05-19
Also published as: CN111964128A

Abstract

The invention relates to a heat shield for a stove and a gas stove using the same, comprising an annular cover body which is of a double-layer structure and is provided with a cavity, and the heat shield is characterized in that: the gas stove comprises a panel and a burner, wherein the burner comprises an outer ring gas mixing chamber, and at least two secondary air supplement small chambers which are relatively isolated are arranged in the outer ring gas mixing chamber.

Description

Heat shield for stove and gas stove with heat shield

Technical Field

The invention relates to the field of gas cookers, in particular to a heat shield for a cooker and a gas cooker with the heat shield.

Background

At present, in the prior art, a blower type household gas stove burner comprises a fan and a burner, but is limited to limited supplement of primary air in a combustion process, secondary air cannot be effectively supplemented, the secondary air supplement is completely adjusted by the outside of the burner, the adjustment is influenced by the structure of the whole gas stove, and the problems of insufficient combustion, overproof CO in smoke, low heat efficiency and the like easily occur. Therefore, as a patent number ZL201120141967.3 (No. 202109479U) discloses a blast type household gas stove burner, which comprises a controller, a fan and a burner, wherein the burner comprises a stove base, a distributor, an air distributor, a gas distributor, a guide pipe, an injection mixing pipe and a nozzle, the distributor is provided with a combustion fire hole and a secondary air through hole, one air pipe is connected with the installation position of a nozzle of a stove head and supplies primary air, and the other air pipe is connected with the upper part of the stove head and supplies secondary air, so that the primary air coefficient and the secondary air distribution in the gas combustion process are directly controlled to ensure the mixing uniformity of gas and air. However, the secondary air of the burner of the gas stove is uniformly distributed on the distributor and is only suitable for the burner with complete premixed combustion, but the heat load is small and is difficult to meet the cooking requirement of China, while the primary air coefficient of the existing atmospheric gas stove burner is generally 0.4-0.7, the premixed air cannot reach the air amount required by complete combustion, and various factors are added, certain secondary air supplement is required, and in order to reduce the emission of CO, the secondary air supplement is required to be as sufficient as possible. At present, the gas stove burner replenishes air in various modes, generally has the mode of side air intake and lower air intake, and the mode of side air intake is opened the side air intake at the lateral part of air mixing chamber promptly, and the outside air carries out the secondary air through this side air intake and supplements, and the mode of lower air intake is opened the air intake down at the base seat promptly, and the air of gas-cooker below carries out the secondary air through this air intake down and supplements. Although the side air intake mode has the advantages of small intake resistance and large intake air amount, the existing side air intake combustor still has the problems as follows: due to the injection effect of combustion hot air flow, secondary air is sucked by the inner fire cover and the outer fire cover through the air mixing chamber side air inlet, the heat load of the inner ring is small, the coefficient of primary air is higher than that of the outer ring, the sucked secondary air is often excessive, the secondary air sucked by the middle ring fire hole of the outer fire cover is insufficient, and further improvement is needed for reasonably distributing the secondary air and simultaneously realizing the sufficient combustion of the inner ring and the outer ring.

On the other hand, in the actual use process of the existing gas stove, because the cooker is placed on the cooker bracket for heating, and a certain space interval is formed between the cooker and the burner, the heat energy generated by the combustion of the gas is used for heating the cooker, and a considerable part of the heat energy is dissipated to the surrounding environment, so that the energy is wasted; in order to solve the above problems, some heat collecting and energy concentrating have appeared in China in recent years, for example, as "the energy concentrating ring for the gas stove and the gas stove with the same" disclosed in chinese patent CN203404823U, the energy concentrating ring is an energy saving component surrounding and arranged at the periphery of the burner, for the gas stove to which the energy concentrating ring is applied, the lateral secondary air supplied to the burner is further affected due to the blocking of the energy concentrating ring, in addition, the secondary air supplement channel of the gas stove to which the energy concentrating ring is applied is lateral air intake, although the secondary air can be preheated when flowing through the secondary air supplement channel of the energy concentrating ring, the preheating effect of the secondary air is not good due to the small preheating surface.

Disclosure of Invention

One technical problem to be solved by the present invention is to provide a heat shield for a range, which can provide preheated secondary air to a burner, in view of the above-mentioned prior art.

A second technical problem to be solved by the present invention is to provide a heat shield for a range that ensures smooth and sufficient supply of secondary air to a burner.

The third technical problem to be solved by the present invention is to provide a gas cooker having the heat shield for cooker, which can provide preheated secondary air to the burner, in view of the above prior art.

The fourth technical problem to be solved by the present invention is to provide a gas stove capable of reasonably distributing secondary air passing through a heat shield for a stove, in view of the above-mentioned current state of the art.

In order to solve the first technical problem, the invention adopts the technical scheme that: this kitchen is with separating heat exchanger, including the annular cover body, the cover body is bilayer structure and has cavity, its characterized in that: the cover body is provided with an air inlet hole on the outer side wall or the bottom wall for the external air to flow into the cavity, and the upper surface of the cover body is provided with air outlet holes at intervals along the circumferential direction for the external air to flow out of the cavity.

In order to solve the second technical problem, it is preferable that the air intake hole is connected to an external air supply part in order to ensure smooth and sufficient supply of the secondary air supplied from the heat shield for a range to the burner. Preferably the gas supply may be a blower.

In order to better preheat the air entering the heat shield for the kitchen range, the bottom wall of the cover body extends upwards along the circumferential direction at intervals to form at least two preheating elements for preheating the air in the cavity.

The choice of the preheating element can be various, and from the viewpoint of sufficient contact between the preheating element and the cover body, it is preferable that: an annular cavity is formed in the center of the cover body, the preheating element is a rotary arm type preheating piece arranged around the annular cavity, and each rotary arm type preheating piece is arranged along the circumferential direction of the bottom wall at intervals and is integrally in a spiral radial shape. The rotary arm type preheating piece can also increase the time for air to stay in the heat insulation cover for the stove.

Furthermore, each swing-arm preheating piece comprises an inner side end and an outer side end, the inner side end is located on the outer surface of the inner side wall of the cover body forming the annular cavity, and the outer side end is located on the inner surface of the outer side wall of the cover body.

Furthermore, the bottom wall of the cover body is provided with at least two secondary air supply channels which are arranged from bottom to top at intervals along the circumferential direction and are communicated with the annular cavity and the outside. When the outside air flows into the secondary air supply channel, the air can be preheated.

In order to solve the third technical problem, the invention provides a gas stove with the heat shield for the stove, which comprises a panel and a burner, wherein the burner comprises:

the outer loop gas mixing chamber, the outer loop gas mixing chamber is including being the annular and concentric inner ring wall and the outer rampart that sets up of interval and the end rampart of connecting inner ring wall and outer rampart, inner ring wall and outer rampart top cover have outer ring fire lid, its characterized in that: the fire cap comprises a cap body, an outer ring air mixing chamber, at least two secondary air replenishing small chambers which are isolated relatively, an air outlet matched with the secondary air replenishing small chambers, a circle of annular wall formed by extending downwards the wall part of the air outlet, a ring-shaped wall attached to the inner peripheral wall of the secondary air replenishing small chambers, and an air inlet communicated with the air outlet at a position corresponding to the secondary air replenishing small chambers.

Furthermore, the secondary air supplement small chamber comprises a pipeline with openings at the upper part and the lower part, and an air outlet of the top wall of the outer ring fire cover is connected with an air inlet of the bottom ring wall of the outer ring air mixing chamber. The secondary air supplement chamber is of a pipeline structure, and the secondary air supplement chamber can adopt any pipeline in the prior art, such as a cylinder or a square frame,

in order to prevent the outer ring air mixing chamber of the burner from directly contacting the panel to cause the temperature rise of the panel, preferably, the outer ring wall of the outer ring air mixing chamber is partially inwardly contracted in the radial direction towards the direction of the secondary air supplement small chamber to form a notch, and correspondingly, the upper surface of the cover body is upwards convexly provided with a positioning block which can be embedded in the notch. The outer ring gas mixing chamber and the heat shield for the stove are matched with the positioning block through the notch, so that the positioning of the outer ring gas mixing chamber and the heat shield for the stove is realized.

In order to realize that the combustor has double ring fires, the combustor also comprises a base, a base and an inner ring fire cover arranged on the base, wherein an inner ring gas mixing chamber positioned on the inner periphery of the outer ring gas mixing chamber is formed between the inner ring fire cover and the base, an opening part communicated with the annular chamber is formed in the panel, and the upper end of the base penetrates through the opening part from bottom to top and is connected with the inner ring fire cover.

Further, the base comprises an inner annular wall and an outer annular wall which are arranged at an interval from inside to outside, a central gas channel is enclosed by the inner annular wall, a peripheral gas channel is enclosed by the inner annular wall and the outer annular wall together, the central gas channel is communicated with the inner annular gas mixing chamber, the peripheral gas channel is communicated with the outer annular gas mixing chamber,

in order to supplement preheated secondary air to the inner ring fire cover, a cover plate is formed by extending the inner periphery of the inner ring wall to the central position above the central gas channel, a through hole communicated with the central gas channel is formed in the center of the cover plate, the hole wall of the through hole protrudes upwards to form a central convex ring, the inner ring fire cover is placed on the central convex ring, the periphery of the cover body is circumferentially provided with outlets of at least two secondary air supplement ports at intervals, and the outlets of the secondary air supplement ports are communicated with the secondary air supplement channel.

In order to realize that the outer peripheral gas channel of the base positioned at the center transmits the mixed primary air and gas to the outer ring gas mixing chamber, the opening wall part of the outlet of the secondary air supplementing opening extends downwards to form a ring of ring walls, a transmission channel for connecting the inner ring wall and the central convex ring is formed between the adjacent ring walls, and the transmission channel is used for transmitting the mixed primary air and gas from the outer peripheral gas channel to the outer ring gas mixing chamber.

In order to better supplement the inner ring fire cover with preheated secondary air, the preferable mode structurally comprises the following steps: the top periphery of the outer annular wall is lower than that of the inner annular wall, the top periphery of the outer annular wall is connected with the upper surface of the cover body through a connecting body, the connecting body is provided with an inlet of the secondary air supplementing opening, and the inlet and the outlet of the secondary air supplementing opening are both communicated with the secondary air supplementing channel.

Further, from bottom to top, the connecting body is divided into three parts from bottom to top according to the change of the cross section: the secondary air supply device comprises an expansion part with a downward opening, a straight part and an extension part with an upward opening, wherein the extension part extends to the upper surface of the cover body from the top periphery of the straight part to the horizontal direction and is abutted against the bottom annular wall of the outer annular air mixing chamber, the expansion part is abutted against the top periphery of the outer annular wall, and an inlet of the secondary air supplement port is arranged on the extension part. The expansion part of the connector has the function of uniformly mixing primary air and gas entering the peripheral gas channel, the straight part has the function of accelerating the flow of the primary air and the gas after the mixing of the expansion part, the extension part can not only realize the connection with the upper surface of the cover body, but also conveniently set an inlet of a secondary air supplement port.

Further, the top periphery of the straight portion is lower than the top periphery of the inner annular wall, and a communicating opening for connecting the transmission channel and the peripheral gas channel is formed by a gap between the straight portion and the cover plate.

Further, the bottom wall of the cover body is provided with at least three support legs, a secondary air supply channel is formed between adjacent support legs, and the support legs and the panel are separated through heat insulation pieces. The heat insulation piece can reduce the heat conducted from the cover body to the panel or the liquid containing plate, and the temperature rise problem of the panel is not easy to cause.

In order to conceal the heat insulating member, the bottom of the leg has a groove recessed upward from bottom to top, and the heat insulating member is disposed inside the groove.

In order to solve the fourth technical problem, preferably, the outer ring fire cover includes the top wall, and an inner wall and an outer wall extending vertically or obliquely downward from an inner edge and an outer edge of the top wall, the inner wall abuts against the inner ring wall, the outer wall abuts against the outer ring wall, portions of the outer wall and the top wall adjacent to the inner wall are located on two sides of the secondary air supplement chamber, first fire outlets communicated with the outer ring air mixing chamber are circumferentially provided at intervals on the outer wall, and second fire outlets communicated with the outer ring air mixing chamber are circumferentially provided at intervals on a portion of the top wall adjacent to the inner wall. The secondary air supplement chamber is positioned between the first fire outlet and the second fire outlet and can supplement preheated secondary air to the first fire outlet and the second fire outlet respectively.

Compared with the prior art, the invention has the advantages that the heat shield for the stove is provided with the air inlet through which the external air flows into the cavity of the heat shield, so that the external air can enter the heat shield and can be effectively preheated, the preheated secondary air can be divided by the air outlet to provide the preheated secondary air for the burner, and the utilization rate of the gas is effectively improved. 1. The secondary air supplement chamber can directly pass through the inner part of the outer ring gas mixing chamber of the outer ring fire cover of the burner to better supplement secondary air through the fire hole of the outer ring fire cover, the gas outlet of the secondary air supplement chamber is radially arranged, the gas supplement distance is approximate to a straight line, the supplement is smoother compared with the traditional lateral supplement, and the complete combustion is ensured; 2. and the secondary air supplements the heat that the cell can transmit to outer loop air mixing chamber, and the secondary air supplements the actual inner surface area of cell big, it is internal: when secondary air enters the secondary air supplement chamber from the outside, the secondary air is fully preheated, and the secondary air supplement chamber is externally provided with: when entering the outer ring gas mixing chamber, the outer ring gas can be directly contacted with the outer wall surface of the secondary air supplement chamber, the contact area is greatly increased, the outer ring gas can also be effectively preheated, namely the inner preheated air and the outer preheated outer ring gas can both effectively improve the heat efficiency; 3. the wall part of the air outlet extends downwards to form a ring of annular wall which is attached to the inner peripheral wall of the secondary air supplement chamber, so that secondary air can only be discharged, and gas cannot enter, and the heat efficiency of the combustor is improved.

Drawings

FIG. 1 is a schematic view of a heat shield for a cooking range according to an embodiment of the present invention;

FIG. 2 is a schematic view of another angle of FIG. 1;

FIG. 3 is a schematic view of a preheating element inside the heat shield for the range of FIG. 1;

FIG. 4 is a schematic view of a heat shield according to an embodiment of the present invention placed on a gas range panel;

FIG. 5 is a schematic view of the structure of the base and the blower under the gas range panel according to the embodiment of the present invention;

FIG. 6 is an exploded view of FIG. 2;

FIG. 7 is a cross-sectional view at an angle of FIG. 2;

FIG. 8 is a cross-sectional view of another external angle of FIG. 2;

FIG. 9 is a schematic structural diagram of an outer ring air mixing chamber (omitting an outer ring fire cover) in an embodiment of the present invention;

FIG. 10 is a schematic structural diagram of an outer ring fire cover in an embodiment of the present invention;

FIG. 11 is a cross-sectional view of an outer ring fire cover in an embodiment of the present invention;

FIG. 12 is a schematic view of a connecting body disposed on a base according to an embodiment of the present invention;

FIG. 13 is a partial cross-sectional view of FIG. 12;

fig. 14 is a schematic structural diagram of a panel according to an embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

As shown in fig. 1 to 14, as a preferred embodiment of the present invention, the heat shield for a stove in this embodiment is not a heat shield in the prior art, and can be connected to an external air supply part 2, such as a blower, so that air provided from the air supply part 2 enters the heat shield and can be effectively preheated, and preheated secondary air can be branched out from the air outlet 13 to provide preheated secondary air for a burner, thereby effectively improving the utilization rate of fuel gas. Specifically, the mask comprises an annular mask body 1, wherein the mask body 1 is of a double-layer structure and is provided with a cavity 11, an air inlet hole 12 for allowing external air to flow into the cavity 11 is formed in the outer side wall or the bottom wall 15 of the mask body 1, and air outlet holes 13 for allowing the external air to flow out of the cavity 11 are formed in the upper surface of the mask body 1 at intervals along the circumferential direction. In order to better preheat the air entering the heat shield, the bottom wall 15 of the housing 1 extends circumferentially and upwardly at intervals with at least two preheating elements for preheating the air in the cavity 11. The choice of the preheating element can be varied, and from the viewpoint of sufficient contact between the preheating element and the cover 1, the present embodiment is preferably: an annular cavity 10 is formed in the center of the cover body 1, the preheating element is a rotary arm type preheating piece 14 arranged around the annular cavity 10, each rotary arm type preheating piece 14 is arranged at intervals along the circumferential direction of a bottom wall 15 and is integrally in a spiral radial shape, and the rotary arm type preheating piece 14 can also increase the time of air staying in the heat insulation cover for the stove. Further, each of the radial arm preheating fins 14 includes an inner end 141 and an outer end 142, the inner end 141 is located on the outer surface of the inner sidewall 105 of the housing 1 forming the annular cavity 10, and the outer end 142 is located on the inner surface of the outer sidewall 106 of the housing 1. In addition, in order to realize that the cover body 1 can also supplement lateral secondary air for the inner ring in the burner with an inner ring structure and an outer ring structure, at least two secondary air supplementing channels 16 which are communicated with the annular cavity 10 and the outside are recessed from bottom to top at intervals along the circumferential direction on the bottom wall 15 of the cover body 1, and when the outside air flows into the secondary air supplementing channels 16, the air can also be preheated.

The invention also provides a gas stove with the heat insulation cover for the stove, which comprises a panel 3 and a burner, wherein the burner comprises an outer ring gas mixing chamber 4, the outer ring gas mixing chamber 4 comprises an inner ring wall 41 and an outer ring wall 42 which are arranged in a ring shape and are concentrically arranged at intervals, and a bottom ring wall 43 connecting the inner ring wall 41 and the outer ring wall 42, an outer ring fire cover 5 covers the upper parts of the inner ring wall 41 and the outer ring wall 42, the cover body 1 is placed on the panel 3, the outer ring gas mixing chamber 4 is arranged on the upper surface of the cover body 1, at least two secondary air supplement small chambers 6 which are relatively separated are arranged in the outer ring gas mixing chamber 4, the top wall 51 of the outer ring fire cover 5 is provided with gas outlets 512 matched with the secondary air supplement small chambers 6, the opening wall parts of the gas outlets 512 extend downwards to form a ring-shaped wall 513, the ring-shaped wall 513 is jointed with the inner circumferential wall 61 of the secondary air supplement small chambers 6, and the bottom ring wall 43 of the outer ring gas mixing chamber 4 is provided with gas outlet holes 13 corresponding to the secondary air supplement small chambers 6 And an air inlet 431 in communication therewith. An independent secondary air supplement small chamber 6 is arranged in the outer ring air mixing chamber 4, the secondary air supplement small chamber 6 can directly pass through the inner part of the outer ring air mixing chamber 4 of the outer ring fire cover 5 of the combustor to better supplement secondary air through a fire hole of the outer ring fire cover 5, an air outlet 512 of the secondary air supplement small chamber 6 is radially arranged, the air supplement distance is approximate to a straight line, the supplement is smoother compared with the traditional lateral air supplement, and the complete combustion is ensured; and the secondary air supplement cells 6 can also transfer heat to the outer ring air mixing chamber 4, and the actual inner surface area of the secondary air supplement cells 6 is large, and the secondary air supplement cells are internally provided with: when the secondary air enters the secondary air supplement chamber 6 from the outside, the secondary air is fully preheated, and the secondary air is discharged to the outside: when entering the outer ring gas mixing chamber 4, the outer ring gas can be directly contacted with the outer wall 53 surface of the secondary air supplement chamber 6, the contact area is greatly increased, the outer ring gas can also be effectively preheated, namely, the inner preheated air and the outer ring gas are both effectively preheated, and the heat efficiency can be effectively improved; the wall of the outlet 512 is extended downwards to form a ring of annular wall 513 attached to the inner wall 61 of the secondary air supplement chamber 6, so that secondary air can only be discharged, and gas can not be discharged, which is helpful for improving the heat efficiency of the burner, furthermore, the heat shield for the stove is provided with an air inlet 12 for external air to flow into the heat shield cavity 11, so that the external air can enter the heat shield and can be effectively preheated, the preheated secondary air can be discharged by the air outlet 13 and enters the secondary air supplement chamber 6, the preheated secondary air is provided for the burner, so as to effectively improve the gas utilization rate, and the outer ring air mixing chamber 4 is arranged on the upper surface of the cover body 1, thereby effectively avoiding the heat accumulated by the outer ring air mixing chamber 4 in the cooking process from conducting heat to the panel 3 and causing the temperature rise of the panel 3.

In this embodiment, the secondary air supplement chamber 6 comprises a duct with an opening at the top and the bottom, and an air inlet 431 connecting the air outlet 512 of the top wall 51 of the outer ring fire cover 5 and the bottom ring wall 43 of the outer ring air mixing chamber 4. The secondary air supplement chamber 6 is of a pipeline structure, the secondary air supplement chamber 6 can adopt any type of pipeline in the prior art, such as a cylinder or a square frame, in order to prevent the outer ring air mixing chamber 4 of the burner from directly contacting with the panel 3 to cause the temperature rise of the panel 3, the outer ring wall 42 of the outer ring air mixing chamber 4 is partially inwards contracted in the radial direction towards the direction of the secondary air supplement chamber 6 to form a notch 421, correspondingly, a positioning block 17 which can be embedded in the notch 421 is convexly arranged on the upper surface of the cover body 1, and the outer ring air mixing chamber 4 and the heat insulation cover for the stove are matched with the positioning block 17 through the notch 421 to realize the positioning of the two. In order to realize that the burner has double ring fire, the burner also comprises a base 7, the base 7 and an inner ring fire cover 8 arranged on the base 7, an inner ring gas mixing chamber 81 positioned on the inner periphery of the outer ring gas mixing chamber 4 is formed between the inner ring fire cover 8 and the base 7, an opening part 31 communicated with the annular chamber 10 is arranged on the panel 3, and the upper end of the base 7 penetrates through the opening part 31 from bottom to top and is connected with the inner ring fire cover 8.

Specifically, the base 7 includes an inner annular wall 71 and an outer annular wall 72 which are arranged at an interval, the inner annular wall 71 encloses a central gas channel 711, the inner annular wall 71 and the outer annular wall 72 together enclose a peripheral gas channel 721, the central gas channel 711 is communicated with the inner annular gas mixing chamber 81, the peripheral gas channel 721 is communicated with the outer annular gas mixing chamber 4, in order to supplement the preheated secondary air to the inner ring fire cover 8, a cover plate 411 is formed by extending the inner periphery of the inner ring wall 41 to the central position above the central gas channel 711, a through hole 4111 communicated with the central gas channel 711 is formed in the center of the cover plate 411, the hole wall of the through hole 4111 protrudes upwards to form a central convex ring 4112, the inner ring fire cover 8 is placed on the central convex ring 4112, at least two outlets 4113 of secondary air supplement ports are formed in the outer periphery of the cover plate 411 at intervals along the peripheral direction, and the outlets 4113 of the secondary air supplement ports are communicated with the secondary air supplement channel 16. In order to realize the purpose that the outer peripheral gas passage 721 of the central base 7 transmits the mixed primary air and gas to the outer ring gas mixing chamber 4, a ring wall 4114 extends downwards from the outlet 4113 of the secondary air supplement port, and a transmission passage 9 connecting the inner ring wall 41 and the central convex ring 4112 is formed between the adjacent ring walls 4114, wherein the transmission passage 9 is used for transmitting the mixed primary air and gas from the outer peripheral gas passage 721 to the outer ring gas mixing chamber 4.

In order to better replenish the inner ring fire cover 8 with preheated secondary air, the preferred way is structurally that: the top periphery of the outer annular wall 72 is lower than the top periphery of the inner annular wall 71, the top periphery of the outer annular wall 72 is connected to the upper surface of the housing 1 through the connecting body 20, the connecting body 20 has an inlet 201 of a secondary air supplement port, and both the inlet 201 and the outlet 4113 of the secondary air supplement port are communicated with the secondary air supplement passage 16. From bottom to top, the connector 20 is divided into three parts from bottom to top according to the change of the cross section: the expansion part 202 with a downward opening, the straight part 203 and the extension part 204 with an upward opening, the extension part 204 extends to the upper surface of the cover body 1 from the top periphery of the straight part 203 to the horizontal direction and is abutted against the bottom ring wall 43 of the outer ring air mixing chamber 4, the expansion part 202 is abutted against the top periphery of the outer ring wall 72, the inlet 201 of the secondary air supplement port is arranged on the extension part 204, the expansion part 202 of the connecting body 20 has the function of uniformly mixing the primary air and the fuel gas entering the outer periphery fuel gas channel 721, the straight part 203 has the function of accelerating the flow of the primary air and the fuel gas mixed by the expansion part 202, and the extension part 204 not only can realize the connection with the upper surface of the cover body 1, but also can be conveniently provided with the inlet 201 of the secondary air supplement port. The top periphery of the straight portion 203 is lower than the top periphery of the inner annular wall 71, and a gap between the straight portion and the cover plate 411 forms a communication opening 91 for connecting the transmission channel 9 and the outer peripheral gas channel 721. Finally, the bottom wall 15 of the cover body 1 is provided with at least three support legs 151, a secondary air supply channel 16 is formed between the adjacent support legs 151, the support legs 151 and the panel 3 are separated by a heat insulation piece 33, and the heat insulation piece 33 can reduce the heat conducted from the cover body 1 to the panel 3 or the liquid containing plate downwards, so that the problem of temperature rise of the panel 3 is not easily caused. In order to hide the heat insulation member 33, the bottom of the supporting leg 151 has a recess 32 recessed from bottom to top, or the panel 3 has a recess 32 recessed from top to bottom, in this embodiment, the panel 3 has the recess 32, and the heat insulation member 33 is disposed in the recess 32 of the panel 3. In the embodiment, the outer ring fire cover 5 comprises a top wall 51, an inner wall 52 and an outer wall 53 extending downwards from the inner edge and the outer edge of the top wall 51 vertically or obliquely, the inner wall 52 abuts against the inner ring wall 41, the outer wall 53 abuts against the outer ring wall 42, the parts of the outer wall 53 and the top wall 51 adjacent to the inner wall 52 are positioned at two sides of the secondary air supplement small chamber 6, the outer wall 53 is circumferentially provided with first fire outlets 531 communicated with the outer ring air mixing chamber 4 at intervals, the part of the top wall 51 adjacent to the inner wall 52 is circumferentially provided with second fire outlets 511 communicated with the outer ring air mixing chamber 4 at intervals, aiming at the particularity that the outer ring fire cover 5 has double ring fire, the secondary air supplement small chamber 6 is positioned between the first fire outlet 531 and the second fire outlet 511, preheated secondary air can be supplemented to the first fire outlet 531 and the second fire outlet 511 respectively, in order to realize that the supplement of preheated secondary air to the first fire outlet 531 and the second fire outlet 511 can rotate, the secondary air replenishment chamber 6 is arranged clockwise or counterclockwise.

The specific process is as follows, when the air supply part 2 such as the blower under the gas stove panel 3 works, firstly enters the cavity 11 of the heat shield, enters the secondary air supplement small chamber 6 of the heat shield after being preheated by the preheating element, then flows out from the air outlet 512, when entering the outer ring air mixing chamber 4 from the peripheral gas channel 721, the gas can directly contact with the outer wall 53 surface of the secondary air supplement small chamber 6, the contact area is greatly increased, the outer ring gas can be effectively preheated, then flows out from the first fire outlet 531 and the second fire outlet 511, and is ignited together with the secondary air flowing out from the secondary air supplement small chamber 6, to form the outer ring fire and the middle ring fire, and the secondary air entering the secondary air supplement channel 16 at the bottom of the heat shield is preheated, then flows out from the inlet 201 of the secondary air supplement port of the connecting body 20 and the outlet 4113 of the secondary air supplement port of the cover plate 411, to supplement the secondary air for the inner ring fire cover 8, the independent secondary air supplement chamber 6 can effectively prevent hot air flow after combustion and high temperature of the combustor from generating entrainment on secondary air supplemented to the inner ring, and avoid the mutual influence of the secondary air between the inner ring and the outer ring.

Claims

1. A gas cooker comprising a panel (3) and a burner, said burner comprising:

outer ring gas mixing chamber (4), outer ring gas mixing chamber (4) including be the annular and concentric inner ring wall (41) and outer rampart (42) that set up at interval and bottom rampart (43) of connecting inner ring wall (41) and outer rampart (42), inner ring wall (41) and outer rampart (42) top cover have outer ring fire lid (5), its characterized in that: the heat shield for the stove is placed on the panel (3), the heat shield for the stove comprises an annular shield body (1), the shield body (1) is of a double-layer structure, a cavity (11) is formed between two layers, air inlets (12) for external air to flow into the cavity (11) are formed in the outer side wall (106) or the bottom wall (15) of the shield body (1), air outlets (13) for the external air to flow out of the cavity (11) are formed in the upper surface of the shield body (1) at intervals along the circumferential direction in the upper surface of the shield body (1), an outer ring air mixing chamber (4) is arranged on the upper surface of the shield body (1), at least two relatively isolated secondary air supplement cells (6) are arranged in the outer ring air mixing chamber (4), an air outlet (512) matched with the secondary air supplement cells (6) is formed in the top wall (51) of the outer ring fire cover (5), and a ring-shaped annular wall (513) is formed by downward extending of the wall part of the air outlet (512), the annular wall (513) is attached to the inner peripheral wall (61) of the secondary air supplement small chamber (6), and an air inlet (431) communicated with the air outlet hole (13) of the cover body (1) is formed in the position, corresponding to the secondary air supplement small chamber (6), on the bottom annular wall (43) of the outer ring air mixing chamber (4).

2. The gas range of claim 1, wherein: the secondary air supplement chamber (6) comprises a pipeline with openings at the upper part and the lower part, and an air outlet (512) of a top wall (51) of the outer ring fire cover (5) and an air inlet (431) of a bottom ring wall (43) of the outer ring air mixing chamber (4) are connected.

3. The gas range of claim 2, wherein: the outer ring wall (42) of the outer ring air mixing chamber (4) is partially inwards contracted in the radial direction towards the direction of the secondary air supplement small chamber (6) to form a notch (421), and correspondingly, the upper surface of the cover body (1) is upwards convexly provided with a positioning block (17) which can be embedded into the notch (421).

4. The gas range of claim 2, wherein: the combustor further comprises a base (7), the base (7) and an inner ring fire cover (8) arranged on the base (7), an inner ring gas mixing chamber (81) located on the inner periphery of the outer ring gas mixing chamber (4) is formed between the inner ring fire cover (8) and the base (7), an opening portion (31) communicated with the annular chamber (10) is formed in the panel (3), and the upper end of the base (7) penetrates through the opening portion (31) from bottom to top and is connected with the inner ring fire cover (8).

5. The gas range of claim 4, wherein: the base (7) comprises an inner annular wall (71) and an outer annular wall (72) which are arranged at an interval from inside to outside, a central gas channel (711) is defined by the inner annular wall (71), a peripheral gas channel (721) is defined by the inner annular wall (71) and the outer annular wall (72), the central gas channel (711) is communicated with the inner annular gas mixing chamber (81), and the peripheral gas channel (721) is communicated with the outer annular gas mixing chamber (4).

6. The gas range of claim 5, wherein: the inner circumference of the inner ring wall (41) extends to the central position on the central gas channel (711) to form a cover plate (411), the center of the cover plate (411) is provided with a through hole (4111) communicated with the central gas channel (711), the hole wall of the through hole (4111) protrudes upwards to form a central convex ring (4112), the inner ring fire cover (8) is placed on the central convex ring (4112), the outer circumference of the cover plate (411) is provided with outlets (4113) of at least two secondary air supplementing ports at intervals along the circumferential direction, and the outlet (4113) of each secondary air supplementing port is communicated with the secondary air supplementing channel (16).

7. The gas range of claim 6, wherein: the outlet wall part of the outlet (4113) of the secondary air supplementing port extends downwards to form a ring of annular wall (4114), a transmission channel (9) for connecting the inner annular wall (41) and the central convex ring (4112) is formed between the adjacent annular walls (4114), and the transmission channel (9) is used for transmitting the mixed primary air and gas from the outer peripheral gas channel (721) to the outer annular gas mixing chamber (4).

8. The gas range of claim 7, wherein: the top circumference of the outer annular wall (72) is lower than that of the inner annular wall (71), the top circumference of the outer annular wall (72) is connected with the upper surface of the cover body (1) through a connecting body (20), the connecting body (20) is provided with an inlet (201) of the secondary air supplement port, and the inlet (201) and the outlet (4113) of the secondary air supplement port are both communicated with a secondary air supplement channel (16).

9. The gas range of claim 8, wherein: from bottom to top, the connecting body (20) is divided into three parts from bottom to top according to the change of the cross section: the secondary air supply device comprises an expansion part (202) with a downward opening, a straight part (203) and an extension part (204) with an upward opening, wherein the extension part (204) extends to the upper surface of the cover body (1) from the top periphery of the straight part (203) to the horizontal direction and is abutted against the bottom annular wall (43) of the outer annular air mixing chamber (4), the expansion part (202) is abutted against the top periphery of the outer annular wall (72), and an inlet (201) of the secondary air supplement port is arranged on the extension part (204).

10. The gas range of claim 9, wherein: the top periphery of the straight part (203) is lower than that of the inner annular wall (71), and a communicating opening (91) which is used for connecting the transmission channel (9) and the peripheral gas channel (721) is formed by a gap between the straight part and the cover plate (411).

11. The gas range according to any one of claims 2 to 10, wherein: the bottom wall (15) of the housing (1) has at least three feet (151), the feet (151) being spaced from the panel (3) by insulation (33).

12. The gas range of claim 11, wherein: the bottom of the supporting leg (151) is provided with a groove which is concave upwards from bottom to top or the panel (3) is provided with a groove (32) which is concave downwards from top to bottom, and the heat insulation piece (33) is arranged in the groove (32).

13. The gas range of claim 12, wherein: the outer ring fire cover (15) comprises a top wall (51), an inner wall (52) and an outer wall (53), wherein the inner wall (52) and the outer wall (53) vertically or obliquely extend downwards from the inner edge and the outer edge of the top wall (51), the inner wall (52) abuts against the inner ring wall (41), the outer wall (53) abuts against the outer ring wall (42), the parts, adjacent to the inner wall (52), of the outer wall (53) and the top wall (51) are located on two sides of the secondary air supplement small chamber (6), first fire outlets (531) communicated with the outer ring gas mixing chamber (4) are formed in the outer wall (53) at intervals along the circumferential direction, and second fire outlets (511) communicated with the outer ring gas mixing chamber (4) are formed in the parts, adjacent to the inner wall (52), of the top wall (51) along the circumferential direction at intervals.

14. Gas range according to claim 12 or 13, characterized in that: the air inlet (12) of the heat shield for the stove is connected with an external air supply part (2).

15. The gas range of claim 14, wherein: at least two preheating elements for preheating the air in the cavity (11) extend upwards from the bottom wall (15) of the cover body (1) along the circumferential direction at intervals.

16. The gas range of claim 15, wherein: an annular cavity (10) is formed in the center of the cover body (1), the preheating element is a rotary arm type preheating piece (14) arranged around the annular cavity (10), and the rotary arm type preheating pieces (14) are arranged at intervals along the circumferential direction of the bottom wall (15) and are integrally in a spiral radial shape.

17. The gas range of claim 16, wherein: each rotary arm type preheating piece (14) comprises an inner end (141) and an outer end (142), wherein the inner end (141) is positioned on the outer surface of the inner side wall (105) of the cover body (1) forming the annular cavity (10), and the outer end (142) is positioned on the inner surface of the outer side wall (106) of the cover body (1).

18. The gas range of claim 17, wherein: at least two secondary air supply channels (16) communicated with the annular cavity (10) and the outside are recessed from bottom to top along the circumferential direction at intervals on the bottom wall (15) of the cover body (1).