CN110836411A

CN110836411A - Heat shield for stove and gas stove with heat shield

Info

Publication number: CN110836411A
Application number: CN201810944956.5A
Authority: CN
Inventors: 史丽莎; 朱志新
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2018-08-19
Filing date: 2018-08-19
Publication date: 2020-02-25

Abstract

The invention relates to a heat shield for a stove, which comprises an annular shield body, wherein an annular cavity is formed in the center of the shield body, the shield body is double-layer and is provided with a cavity, and the heat shield is characterized in that: the gas stove can independently supplement secondary air for the inner ring and the outer ring by utilizing a separator arranged on the heat shield, effectively avoids the phenomenon that the secondary air of the inner ring is excessive and the secondary air of the outer ring is insufficient from being unreasonably distributed, forcibly shunts the secondary air by the separator, ensures that the inner ring and the outer ring can be fully combusted, and is particularly suitable for an outer ring fire cover with two rings of fire, and the separator can avoid the mutual influence of the secondary air between the inner ring and the outer ring on one hand.

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 lateral secondary air to a burner, in view of the above-mentioned prior art.

The second technical problem to be solved by the invention is to provide a heat shield for a kitchen range, which ensures smooth and sufficient lateral secondary air supply to a burner.

The third technical problem to be solved by the present invention is to provide a gas stove using the heat insulation cover for a stove 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 entering through the side of the heat shield for the stove, aiming at the current state of the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: this kitchen is with heat exchanger that separates, including the annular cover body, the central authorities of the cover body are formed with annular chamber, the cover body is double-deck and has cavity, its characterized in that: the cover body is provided with air outlet holes which are communicated with the annular cavity and the cavity at intervals along the circumferential direction on the inner side wall which forms the annular cavity, and the cover body is provided with air inlet holes which are used for allowing outside air to flow into the cavity on the outer side wall or the bottom wall.

In order to ensure that the lateral secondary air provided by the heat shield for the stove to the burner is smooth and sufficient, the air inlet is connected with an external air supply part. Preferably the gas supply may be a blower.

In order to correspondingly supplement secondary air to the fire outlet areas of the inner ring fire cover and the outer ring fire cover of the combustor, the inner side wall of the cover body is provided with an annular inner step, the air outlet holes comprise an upper row of first air outlet holes and a lower row of second air outlet holes which are arranged at intervals, the first air outlet holes in the upper row are located on a first wall surface above the step, and the second air outlet holes in the lower row are located on a second wall surface below the step. The first air outlet hole supplements secondary air to the fire outlet area of the outer ring fire cover more pertinently, and the second air outlet hole supplements secondary air to the fire outlet area of the inner ring fire cover more pertinently.

In order to better contain overflowing liquid by the heat insulation cover for the stove, the upper surface of the step is gradually inclined downwards from inside to outside along the radial direction to form a liquid containing area.

In order to prevent the secondary air from being sucked by the inner fire cover and the outer fire cover through the lateral secondary air supplementing channel of the heat shield, at least one separator is arranged in the liquid containing area, and the separator can separate the liquid containing area into at least two relatively independent spaces. The space that the separator divides can be for the secondary tonifying qi passageway tonifying qi of the side direction of combustor to the pertinence, and the first venthole that the separator separates can carry out the replenishment of secondary air for the fire outlet of outer ring fire lid relatively better.

From the perspective of simple installation structure, preferably, the partition comprises two side plates arranged at a vertical interval, and a gap for communicating the annular cavity with the cover cavity is formed between the two side plates.

In order to have a directional flow guiding effect on secondary air and reduce the supply resistance of the secondary air to outer ring flame, so that the secondary air is supplied more quickly, the first wall surface protrudes upwards from the top end surface between the two side plates, and the top end surface is gradually inclined downwards from inside to outside towards the upper surface of the bottom of the cover body.

In order to supplement secondary air for the outer ring fire cover with fire holes inside and outside, third air outlet holes which are communicated with the cavity in a fluid mode are formed in the wall face, close to the annular cavity, of the top end face at intervals in the circumferential direction. The third air outlet hole supplements the inner fire outlet area of the outer ring fire cover more specifically.

In order to enable secondary air flowing out of the air outlet of the cover body to be effectively preheated, a vertical annular partition plate is further arranged in the cavity of the cover body, a gap is formed between the lower end edge of the partition plate and the lower surface of the bottom of the cover body, the partition plate divides the cavity into an air outlet cavity located on the inner side and a preheating cavity located on the outer side, a preheating channel for preheating the secondary air is accommodated in the preheating cavity, an air inlet of the preheating channel is directly communicated with the air inlet, and an air outlet which is in fluid communication with the air inlet is formed in the position, close to the gap, of the preheating channel. And in order to increase the contact area between the preheating channel and the preheating cavity, the preheating channel is in a spiral disc shape.

In order to buffer the secondary air flowing out of the preheating cavity, the bottom of the air outlet cavity is more convex than the lower surface of the bottom of the cover body, and the air outlet holes are correspondingly arranged in the air outlet cavity.

In order to better realize that the heat shield can be stably placed on the liquid containing disc on the gas stove panel, the lower surface of the bottom of the shield body is provided with a foot pad, and the plane of the bottom of the foot pad is lower than the plane of the bottom of the gas outlet cavity.

In order to support the cookware conveniently, the top periphery of the cover body is fixed with a pot support leg.

The present invention provides a gas cooker with the heat shield for cooker, including a gas cooker panel and a burner, wherein the burner includes:

a base;

the inner ring fire cover is arranged on the base, and a central air mixing chamber is formed between the inner ring fire cover and the base;

the outer ring fire cover is also arranged on the base, is positioned at the periphery of the inner ring fire cover, and forms an outer ring gas mixing chamber with the base; an air supplement cavity is formed between the central air mixing chamber and the outer ring air mixing chamber; a plurality of radial secondary air supply channels for communicating the air supply cavity with the outside are arranged on the base at intervals along the circumferential direction;

the method is characterized in that: the annular cavity of the heat shield surrounds the burner and is placed on a gas stove panel, and the separators of the liquid containing area of the shield body and the secondary air supply channel are aligned one by one.

Aiming at the particularity of an outer ring fire cover with two rings of fire, the outer ring fire cover comprises an annular body and a main cover plate covering the annular body, and the body comprises a middle ring area and an outer ring area which are concentrically arranged;

the middle ring area is provided with main fire holes which are communicated with the outer ring gas mixing chamber and are formed at intervals along the circumferential direction; a plurality of bosses protruding upwards on the surface of the body are arranged on the outer ring area at intervals along the same edge of the body, gaps communicated with the middle ring area are formed between adjacent bosses at intervals, the gaps are also aligned with the separators one by one, radial main fire grooves are formed on each boss at intervals along the circumferential direction, the second air outlet holes are communicated with the outer wall area of the central air mixing chamber through the secondary air supply channel, the third air outlet holes are communicated with the main fire holes of the middle ring area through the gaps, and the first air outlet holes are communicated with the main fire grooves of the outer ring area. Because the middle ring area of the outer ring fire cover needs a large amount of secondary air, the secondary air can be supplemented to the outer side of the middle ring area through the first air outlet hole and the third air outlet hole which are positioned in the two vertical side plates of the separator through the gap between the adjacent bosses, so that the full combustion of the middle ring is ensured; the secondary air is supplemented to the outer ring area of the outer ring fire cover through the first air outlet holes positioned outside the two vertical side plates of the separating piece, and the secondary air is supplemented to the outer wall area of the central air mixing chamber of the inner ring fire cover through the second air outlet holes positioned in the two vertical side plates of the separating piece through the secondary air supplementing channel.

In order to facilitate positioning of the main cover plate, the middle ring area of the body is provided with an inner ring portion and an outer ring portion, the top end of the inner ring portion is higher than the top end of the outer ring portion, the main fire hole axially penetrates through the top surface of the inner ring portion, the main cover plate is located on the outer ring portion, the inner side edge of the main cover plate is abutted to the outer side of the inner ring portion, and the outer side edge of the main cover plate is matched with the main fire grooves of the bosses to form side fire holes respectively.

For the difficult flame that leaves of side fire hole of outer loop fire lid, each along the shaping of circumferencial direction interval ground have radial flame stabilizing groove on the boss, flame stabilizing groove with main fire groove interval sets up, the outside edge of main apron with the flame stabilizing groove cooperation of boss forms flame stabilizing hole respectively, and the outside edge downwardly extending of main apron forms and shelters from the waterproof eaves of side fire hole and flame stabilizing hole top.

In order to better supply gas to the outer ring fire cover, at least two through holes for gas to pass through are formed in the horizontal connecting part, connected between the middle ring area and the outer ring area, in the body.

Furthermore, a central gas channel communicated with the central gas mixing chamber and an outer ring gas channel communicated with the outer ring gas mixing chamber are arranged on the base, the central gas channel is communicated with the central injection pipe, and the outer ring gas channel is communicated with the outer ring injection pipe.

In order to effectively preheat air provided by an air supply part when the air enters the heat shield, a part of preheated secondary air can be divided into a central injection pipe and an outer ring injection pipe to provide preheated primary air for a burner, so as to effectively improve the utilization rate of fuel gas.

Compared with the prior art, the invention has the advantages that the heat shield is provided with the air inlet hole for the external air to flow 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 hole to provide the preheated secondary air for the combustor, thereby effectively improving the utilization rate of the fuel gas, the invention also provides the gas stove utilizing the heat shield, the gas stove can independently supplement the secondary air for the inner ring and the outer ring by utilizing the separator arranged on the heat shield, effectively avoiding the phenomenon that the secondary air of the inner ring is excessive and the secondary air of the outer ring is insufficient, forcibly dividing the secondary air by the separator to ensure that the inner ring and the outer ring can be fully combusted, and the gas stove is particularly suitable for an outer ring fire cover with two rings of fire, and the separator can avoid the mutual influence of the secondary air between the inner ring and the outer ring on one hand, on the other hand, the secondary air can be effectively supplemented to the ring fire of the two ring fires of the outer ring fire cover close to the inner ring, the positioning is accurate, the gas combustion efficiency is improved, meanwhile, the separator can recycle the heat of the gas mixing chamber, the secondary air is further preheated, and the improvement of the heat efficiency of the combustor is facilitated.

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 cross-sectional view of FIG. 1;

FIG. 3 is a schematic view of the heat shield of the embodiment of the present invention placed on a gas range;

FIG. 4 is a cross-sectional view of FIG. 3;

FIG. 5 is a schematic view of a burner according to an embodiment of the present invention;

FIG. 6 is an exploded view of FIG. 5;

FIG. 7 is a schematic structural diagram of an outer ring fire cover body according to an embodiment of the invention.

Detailed Description

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

As shown in fig. 1 to 7, as a best 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 portion 8, such as a blower, so that air provided from the air supply portion 8 enters the heat shield and can be effectively preheated, and preheated secondary air can be branched out from an air outlet to provide preheated secondary air for a burner, thereby effectively improving the gas utilization rate. Specifically, the mask body includes an annular mask body 1, an annular cavity 10 is formed in the center of the mask body 1, the mask body 1 is double-layered and has a cavity 11, air outlets for communicating the annular cavity 10 with the cavity 11 are formed on an inner side wall 101 forming the annular cavity 10 of the mask body 1 at intervals along the circumferential direction, and air inlets (not shown in the drawing) for allowing outside air to flow into the cavity 11 are formed on an outer side wall 102 of the mask body 1, and of course, the air inlets may also be formed on a bottom wall 103. In order to supplement secondary air correspondingly to the fire outlet areas of the inner ring fire cover 6 and the outer ring fire cover 7 of the burner, the inner side wall of the cover body 1 is provided with an annular inner step 14, the air outlet holes comprise an upper row of first air outlet holes 121 and a lower row of second air outlet holes 131 which are arranged at intervals, wherein the upper row of the first air outlet holes 121 is positioned on a first wall surface 12 above the step 14, the lower row of the second air outlet holes 131 is positioned on a second wall surface 13 below the step, the first air outlet holes 121 supplement the secondary air to the fire outlet area of the outer ring fire cover 7 more specifically, and the second air outlet holes 131 supplement the secondary air to the fire outlet area of the inner ring fire cover 6 more specifically. In order to better contain the overflowing liquid, the upper surface of the step 14 is gradually inclined downwards from inside to outside along the radial direction to form a liquid containing area 141.

In order to prevent the secondary air from being sucked by the inner fire cover and the outer fire cover through the air mixing chamber lateral secondary air supplementing channel 51, at least one partition 2 arranged at intervals along the circumferential direction is arranged in the liquid containing area 141, the partition 2 can divide the liquid containing area 141 into at least two relatively independent spaces, wherein the space partitioned by the partition 2 can supplement air to the fire outlet area of the inner ring fire cover 6 through the lateral secondary air supplementing channel 51 in a targeted manner, the first air outlet holes 121 partitioned by the partition 2 can better supplement the secondary air for the fire outlet area of the outer ring fire cover 7 correspondingly, and from the viewpoint of simple installation, preferably, the partition 2 comprises two side plates arranged at intervals in the vertical direction, and a gap 17 for communicating the annular cavity 10 with the cavity 11 of the cover body 1 is arranged between the two side plates. In order to make the space formed by the partition 2 have a directional flow guiding effect on the secondary air and reduce the resistance of the secondary air to the outer ring flame, so that the secondary air is supplied more rapidly, the first wall surface 12 protrudes upward from the top end surface 123 between the two side plates, and the top end surface 123 is gradually inclined downward from inside to outside toward the upper surface 15 of the bottom of the cover 1. The invention is also focused on the burner in the prior art having the inner ring fire cover 6 and the outer ring fire cover 7, the outer ring fire cover 7 generally has only one ring fire, and for the case that the outer ring fire cover 7 has two ring fires, the supplement of the secondary air of the one ring fire of the two ring fires of the outer ring fire cover 7 close to the inner ring is particularly critical, for this reason, the top end face 123 of the first wall face 12 of the heat shield is provided with third air outlet holes 1231 in fluid communication with the cavity 11 at intervals along the circumferential direction on the wall face adjacent to the annular cavity 10, and the third air outlet holes 1231 can supplement the secondary air of the one ring fire close to the inner ring in the special structure of the outer ring fire cover 7 with two ring fires. In addition, in order to make the secondary air flowing out from the air outlet 31 of the cover body 1 be able to be effectively preheated, a vertical annular partition plate 111 is further arranged in the cavity 11 of the cover body 1, a gap 17 is formed between the lower end edge of the partition plate 111 and the lower surface 16 of the bottom of the cover body 1, the partition plate 111 divides the cavity 11 into an air outlet cavity 111 at the inner side and a preheating cavity 112 at the outer side, a preheating channel 3 for preheating the secondary air is accommodated in the preheating cavity 112, an air inlet of the preheating channel 3 is directly communicated with an air inlet, and an air outlet 31 which is in fluid communication with the air inlet is arranged near the gap 17 of the preheating channel 3, in this embodiment, in order to increase the contact area between the preheating channel 3 and the preheating cavity 112, the preheating channel 3 is in a spiral disk shape, and in order to buffer the secondary air flowing out from the preheating cavity 112, the bottom of the air outlet cavity 111 is more protruded, meanwhile, in order to better realize that the heat shield can be stably placed on the liquid containing disc 20 of the gas stove panel 4, the lower surface 16 of the bottom of the cover body 1 is provided with a foot pad 161, the plane of the bottom of the foot pad 161 is slightly lower than the plane of the bottom of the gas outlet cavity 111, and a pan support leg 18 is fixed on the periphery of the top of the cover body 1 for supporting a pan.

As shown in fig. 3, the schematic diagram of the heat shield placed on the gas stove is shown, the gas stove includes a gas stove panel 4 and a burner, wherein the burner includes a base 5, an inner ring fire cover 6 disposed on the base 5, a central air mixing chamber 61 is formed between the inner ring fire cover 6 and the base 5, an outer ring fire cover 7 is also disposed on the base 5, the outer ring fire cover 7 is located at the periphery of the inner ring fire cover 6 and forms an outer ring air mixing chamber 71 with the base 5, and an air replenishing chamber 70 is formed between the central air mixing chamber 61 and the outer ring air mixing chamber 71; a plurality of radial secondary air supplementing channels 51 for communicating the air supplementing cavity 70 with the outside are arranged on the base 5 at intervals along the circumferential direction; the annular cavity 10 of the heat shield surrounds the burner and is placed on the gas stove panel 4, the space partitioned by the two vertical side plates of the partition 2 of the liquid containing area 141 of the cover body 1 and the secondary air supplementing channel 51 are aligned one by one, so that the space partitioned by the partition 2 can be used for supplementing air to the fire outlet area of the inner ring fire cover 6 through the lateral secondary air supplementing channel 51 in a targeted manner, and the first air outlet holes 121 partitioned by the partition 2 can better supplement secondary air to the fire outlet area of the outer ring fire cover 7 correspondingly. Specifically, the outer fire cover 7 of the present embodiment is also relatively special accordingly, the outer fire cover 7 includes an annular body 72 and a main cover plate 73 covering the annular body 72, the body 72 includes a middle ring area 721 and an outer ring area 722 which are concentrically arranged; the middle ring area 721 is provided with main fire holes 7211 which are communicated with the outer ring air mixing chamber 71 and are formed at intervals along the circumferential direction; a plurality of bosses 7221 protruding from the surface of the body 72 are arranged on the outer ring zone 722 at intervals along the same edge of the body 72, gaps 7222 communicated with the middle ring zone 721 are formed at intervals between adjacent bosses 7221, the gaps 7222 are also aligned with the partition 2 one by one, radial main fire grooves 7223 are formed on each boss 7221 at intervals along the circumferential direction, the second air outlet 131 is communicated with the outer wall area of the central air mixing chamber 61 through the secondary air supply channel 51, the third air outlet 1231 is communicated with the main fire holes 7211 of the middle ring zone 721 through the gaps 7222, and the first air outlet 121 is communicated with the main fire grooves 7223 of the outer ring zone 722. The middle ring area 721 of the body 72 has two parts, namely, an inner ring part 7212 and an outer ring part 7213, the top end of the inner ring part 7212 is higher than the top end of the outer ring part 7213, main flame holes 7211 axially penetrate the top surface of the inner ring part 7212, a main cover plate 73 is positioned on the outer ring part 7213, the inner side edge 731 of the main cover plate is abutted against the outside of the inner ring part 7212, the outer side edge 732 of the main cover plate 73 is matched with the main flame grooves 7223 of the bosses 7221 to respectively form side flame holes, for better flame discharging, radial flame stabilizing grooves 7224 are formed on each boss 7221 at intervals along the circumferential direction, the flame stabilizing grooves 7224 are arranged at intervals with the main flame grooves 7223, the outer side edge 732 of the main cover plate 73 is matched with the flame stabilizing grooves 7224 of the bosses 7221 to respectively form flame stabilizing holes, the size of the outlet formed by the gaps 17 between the main flame stabilizing grooves 7223 and the flame stabilizing grooves 7224 determines the size of the side flame and the flame stabilizing flame, the size of the flame can be determined according to the design requirements, and the, the gap 17 for supplementing secondary air can be formed, the outer edge 732 of the main cover plate 73 extends downwards to form a waterproof brim for shielding the upper parts of the side fire holes and the flame stabilizing holes, and gas flows out and burns finally after being impacted by the waterproof brim, so that the gas flow speed is low, and a good flame stabilizing effect is also achieved.

Since the middle ring area 721 of the outer ring fire cover 7 needs a large amount of secondary air, the secondary air can be supplemented to the outside of the middle ring area 721 through the first air outlet holes 121 and the third air outlet holes 1231 positioned in the two vertical side plates of the partition 2 through the gaps 7222 between the adjacent bosses 7221, so as to ensure the sufficient combustion of the middle ring; the supplementary of the secondary air is performed to the outer ring area 722 of the outer ring fire cover 7 through the first air outlet holes 121 located outside both vertical side plates of the partitioning member 2, and the supplementary of the secondary air is performed to the outer wall area of the central air mixing chamber 61 of the inner ring fire cover 6 through the secondary air replenishing passage 51 through the second air outlet holes 131 located inside both vertical side plates of the partitioning member 2. In order to better supply gas to the outer ring fire cover 7, at least two through holes 7231 for gas to pass through are formed in a horizontal connecting part 723, which is connected between the middle ring area 721 and the outer ring area 722, in the body 72. The base 5 is provided with a central gas channel 52 communicated with the central gas mixing chamber 61 and an outer ring gas channel 53 communicated with the outer ring gas mixing chamber 71, the central gas channel 52 is communicated with the central ejector pipe 521, and the outer ring gas channel 53 is communicated with the outer ring ejector pipe 531. Finally, in order to effectively preheat the heat shield when the air provided by the air supply part 8 enters the heat shield, a part of the preheated secondary air can be divided into the central injection pipe 521 and the outer ring injection pipe 531 to provide preheated primary air for the burner, so as to effectively improve the utilization rate of the fuel gas, the heat shield further comprises the air supply part 8 positioned outside the central injection pipe 521 and the outer ring injection pipe 531, the air supply part 8 is communicated with the air inlet, the preheating channel 3 is further provided with a first flow dividing port (not shown) spaced from the air inlet, the cover body 1 is provided with a second flow dividing port (not shown) corresponding to the first flow dividing port, and the second flow dividing port is communicated with the central injection pipe 521 through a first pipeline 81 and is communicated with the air inlet end of the outer ring injection pipe 531 through a second pipeline 82.

The specific process is as follows, when the air supply part 8 under the gas stove panel 4 works as a blower, firstly enters the preheating channel 3 arranged in the heat shield preheating cavity 112, the secondary air preheated by the heat shield preheating channel 3 can be divided into two paths to respectively enter the air inlet ends of the central ejector pipe 521 and the outer ring ejector pipe 531 so as to provide preheated primary air for the burner, the premixed primary air and the gas are distributed and then enter the main fire hole 7211, the side fire holes and the flame stabilizing holes of the outer ring fire cover 7 from the outer ring gas channel 53, the other path of gas enters the outer ring wall of the inner ring fire cover 6 from the central gas channel to form a cavity and further flows out from the inner ring fire holes on the inner ring fire cover 6, and the air entering the preheating channel 3 flows out from the air outlet holes of the air outlet cavity 111 after being preheated, wherein the annular cavity 10 of the heat shield surrounds the burner and is placed on the gas stove panel 4, the partition 2 of the liquid containing area 141 and the secondary air supplementing channel 51 of the burner are aligned one by one, so that the first air outlet 121 and the third air outlet 1231 in the two vertical side plates of the partition 2 supplement secondary air to the outer side of the middle ring area 721 through the gap 7222 between the adjacent bosses 7221, and the full combustion of the middle ring is ensured; the secondary air is supplemented to the outer ring area 722 of the outer ring fire cover 7 through the first air outlet holes 121 positioned outside the two vertical side plates of the separator 2, the secondary air is supplemented to the outer wall area of the central air mixing chamber 61 of the inner ring fire cover 6 through the second air supply channels 51 through the second air outlet holes 131 positioned inside the two vertical side plates of the separator 2, the independent air supply channels can effectively avoid entrainment of hot air flow after combustion and high temperature of a combustor to the secondary air supplied to the inner ring, and the secondary air between the inner ring and the outer ring is prevented from being influenced mutually.

Claims

1. The utility model provides a kitchen is with heat exchanger that separates, including annular cover body (1), the central authorities of cover body (1) are formed with annular chamber (10), cover body (1) is double-deck and have cavity (11), its characterized in that: the cover body (1) is provided with air outlet holes which are communicated with the annular cavity (10) and the cavity (11) on the inner side wall (101) which forms the annular cavity (10) at intervals along the circumferential direction, and the cover body (1) is provided with air inlet holes which are used for allowing outside air to flow into the cavity (11) on the outer side wall (102) or the bottom wall (103).

2. The cooktop heat shield of claim 1, wherein: the air inlet is connected with an external air supply part (8).

3. The cooktop heat shield of claim 1 or 2, wherein: the inner side wall of the cover body (1) is provided with an annular inner step (14), the air outlet holes comprise an upper row of first air outlet holes (121) and a lower row of second air outlet holes (131) which are arranged at intervals, the first air outlet holes (121) in the upper row are located on a first wall surface (12) above the step (14), and the second air outlet holes (131) in the lower row are located on a second wall surface (13) below the step.

4. The cooktop heat shield of claim 3, wherein: the upper surface of the step (14) is gradually inclined downwards from inside to outside along the radial direction to form a liquid containing area (141).

5. The cooktop heat shield of claim 4, wherein: at least one separator (2) is arranged in the liquid containing area (141), and the separator (2) can separate the liquid containing area (141) into at least two relatively independent spaces.

6. The cooktop heat shield of claim 5, wherein: the separating piece (2) comprises two side plates which are vertically arranged at intervals, and a gap (17) which is used for communicating the annular cavity (10) with the cavity (11) of the cover body (1) is arranged between the two side plates.

7. The heat shield for a cooktop according to any one of claims 4 to 6, wherein: the top end face (123) of the first wall face (12) between the two side plates protrudes upwards, and the top end face (123) is gradually inclined downwards from inside to outside towards the upper surface (15) of the bottom of the cover body (1).

8. The cooktop heat shield of claim 7, wherein: the top end face (123) is provided with third air outlet holes (1231) which are communicated with the cavity (11) at intervals along the circumferential direction on the wall surface adjacent to the annular cavity (10).

9. The cooktop heat shield of claim 8, wherein: still be equipped with vertical cyclic annular baffle (111) in cavity (11) of the cover body (1), the lower terminal edge of baffle (111) with lower surface (16) of the cover body (1) bottom have clearance (17), baffle (111) will cavity (11) are separated into and are located inboard air outlet chamber (111) and be located the preheating chamber (112) in the outside, preheating chamber (112) are held preheating channel (3) of preheating the secondary air, preheating channel's (3) income gas port directly with the inlet port is linked together, and preheating channel (3) are close to clearance (17) seted up with gas outlet (31) of inlet port phase fluid intercommunication.

10. The cooktop heat shield of claim 9, wherein: the bottom of the air outlet cavity (111) is more convex than the lower surface (16) of the bottom of the cover body (1), and the air outlet hole is correspondingly arranged in the air outlet cavity (111).

11. The cooktop heat shield of claim 10, wherein: the lower surface (16) of the bottom of the cover body (1) is provided with a foot pad (161), and the plane of the bottom of the foot pad (161) is lower than the plane of the bottom of the air outlet cavity (111).

12. The cooktop heat shield of claim 1 or 2, wherein: the top periphery of the cover body (1) is fixed with a pot supporting leg (18).

13. A gas range using the heat shield for range as claimed in any one of claims 8 to 11, comprising a gas range panel (4) and a burner, the burner comprising:

a base (5);

the inner ring fire cover (6) is arranged on the base (5), and a central air mixing chamber (61) is formed between the inner ring fire cover and the base (5);

the outer ring fire cover (7) is also arranged on the base (5), is positioned at the periphery of the inner ring fire cover (6), and forms an outer ring air mixing chamber (71) with the base (5); an air supplement cavity (70) is formed between the central air mixing chamber (61) and the outer ring air mixing chamber (71); a plurality of radial secondary air supplementing channels (51) for communicating the air supplementing cavity (70) with the outside are arranged on the base (5) at intervals along the circumferential direction;

the method is characterized in that: the annular cavity (10) of the heat shield surrounds the burner and is placed on a gas stove panel (4), and the separators (2) of the liquid containing area (141) of the shield body (1) and the secondary air supplementing channels (51) are aligned one by one.

14. The gas range of claim 13, wherein: the outer ring fire cover (7) comprises an annular body (72) and a main cover plate (73) covering the annular body, and the body (72) comprises a middle ring area (721) and an outer ring area (722) which are concentrically arranged;

the middle ring area (721) is provided with main fire holes (7211) which are communicated with the outer ring gas mixing chamber (71) and are formed at intervals along the circumferential direction; a plurality of bosses (7221) protruding from the surface of the body (72) are arranged on the outer ring area (722) at intervals along the same edge of the body (72), gaps (7222) communicated with the middle ring area (721) are formed at intervals between adjacent bosses (7221), the gaps (7222) are also aligned with the separators (2) one by one, radial main fire grooves (7223) are formed on each boss (7221) at intervals along the circumferential direction, the second air outlet holes (131) are communicated with the outer wall area of the central air mixing chamber (61) through the secondary air supply channel (51), the third air outlet holes (1231) are communicated with the main fire holes (7221) of the middle ring area (721) through the gaps (7222), and the first air outlet holes (121) are communicated with the main fire grooves (7223) of the outer ring area (722).

15. The gas range of claim 14, wherein: the middle ring area (721) of the body (72) is provided with an inner ring portion (7212) and an outer ring portion (7213), the top end of the inner ring portion (7212) is higher than the top end of the outer ring portion (7213), the main fire holes (7211) axially penetrate through the top surface of the inner ring portion (7212), the main cover plate (73) is located on the outer ring portion (7213), the inner side edge (731) of the main cover plate is abutted to the outer side of the inner ring portion (7212), and the outer side edge (732) of the main cover plate (73) is matched with the main fire groove (7223) of the boss (7221) to form side fire holes respectively.

16. The gas range of claim 15, wherein: each along the interval shaping of circumferencial direction on boss (7221) have radial flame holding groove (7224), flame holding groove (7224) with main flame groove (7223) interval sets up, the outside edge (732) of main apron (73) with flame holding groove (7224) cooperation of boss (7221) forms the flame holding hole respectively, and outside edge (732) downwardly extending of main apron (73) forms and shelters from the waterproof eaves of side flame hole and flame holding hole top.

17. The gas range of claim 15, wherein: at least two through holes (7231) for gas to pass through are formed in a horizontal connecting part (723) in the body (72) and connected between the middle ring area (721) and the outer ring area (722).

18. The gas range according to any one of claims 13 to 17, wherein: the base (5) is provided with a central gas channel (52) communicated with the central gas mixing chamber (61) and an outer ring gas channel (53) communicated with the outer ring gas mixing chamber (71), the central gas channel (52) is communicated with a central injection pipe (521), and the outer ring gas channel (53) is communicated with an outer ring injection pipe (531).

19. The gas range of claim 18, wherein: the air supply part (8) is positioned outside the central injection pipe (521) and the outer ring injection pipe (531), the preheating channel (3) is further provided with a first flow dividing port spaced from the air inlet hole, the cover body (1) is provided with a second flow dividing port corresponding to the first flow dividing port, and the second flow dividing port is communicated with the air inlet end of the central injection pipe (521) and/or the outer ring injection pipe (531) through a pipeline.