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

Abstract

The invention relates to a heat shield for a stove, which comprises an annular cover body, an annular cavity is formed in the center of the cover body, the cover body is double-layered and has a cavity, and is characterized in that: the cover body is formed when the cover body is formed. The inner side wall of the annular cavity is provided with air outlet holes that communicate with the annular cavity and the cavity at intervals along the circumferential direction, and the outer side wall or bottom wall of the cover body is provided with external air to flow into the cavity. The invention also provides a gas cooker applied with the above-mentioned heat shield for the cooker. The gas cooker can independently conduct secondary air to the inner and outer rings by using the partitions arranged on the heat shield. It can effectively avoid the unreasonable distribution of secondary air in the inner ring with excess secondary air and insufficient secondary air in the outer ring. The secondary air is forcibly shunted through this partition, so that both the inner and outer rings can be fully burned, especially suitable for The outer ring fire cover with two fire rings can avoid the mutual influence of the secondary air between the inner ring and the outer ring.

Description

A heat shield for a stove and a gas stove using the heat shield

technical field

The invention relates to the field of gas stoves, in particular to a heat shield for a stove and a gas stove applied with the heat shield for a stove.

Background technique

In the current state of the art, a blower-type household gas stove burner includes a fan and a burner, but is limited to limited supplementation of primary air during the combustion process, and cannot effectively supplement secondary air. Secondary air supplementation The adjustment is completely dependent on the outside of the burner. This adjustment is affected by the structure of the entire gas stove, which is prone to problems such as insufficient combustion, excessive CO in the flue gas, and low thermal efficiency. To this end, for example, a patent number is ZL201120141967.3 (authorized announcement number is 202109479U) which discloses a blower type household gas gas stove burner, including a controller, a fan and a burner, and the burner includes a stove base, a fire distributor, Air distributor, gas distributor, conduit, ejector mixing pipe and nozzle. There are combustion fire holes and secondary air through holes on the fire distributor. Two air pipes are connected to the outlet of the fan, and one is connected to the installation of the burner nozzle. The primary air is supplied, and the other is connected to the upper part of the burner head to supply the secondary air, so as to directly control the primary air coefficient and the distribution of the secondary air during the gas combustion process to ensure the uniformity of gas and air mixing. However, the secondary air of the gas stove burner is evenly distributed to the fire distributor, which is only suitable for the burner with complete premixed combustion, but its heat load is small, which makes it difficult to meet the cooking requirements of our country, and the existing atmospheric gas stove The primary air coefficient of the burner is generally 0.4-0.7, the premixed air cannot reach the air volume required for complete combustion, plus various factors, a certain amount of secondary air is required, and in order to reduce CO emissions, two Secondary air supplementation should be as sufficient as possible. At present, there are various ways of supplementing air for gas stove burners. Generally, there are side air intake and bottom air intake. The way of side air intake is to open a side air inlet on the side of the mixing chamber, and the outside air passes through this side. The secondary air is supplemented to the air inlet. The way of lower air intake is to open the lower air inlet at the base of the base, and the air under the gas stove is supplemented by the secondary air through the lower air inlet. Among them, although the side air intake method has the advantages of small air intake resistance and large air intake volume, the existing side air intake burners still have problems, such as: due to the ejection effect of the combustion hot air, the internal and external fire The cover will entrain secondary air through the side air inlet of the mixing chamber. The heat load of the inner ring is small, and the primary air coefficient is higher than that of the outer ring, so the entrained secondary air is often excessive, and the fire hole in the middle ring of the outer ring fire cover In order to distribute the secondary air reasonably and achieve full combustion of the inner and outer rings at the same time, further improvements are needed.

On the other hand, in the actual use process of the existing gas stove, because the pot is placed on the pot support for heating, there is a certain space interval between the pot and the burner, so that the heat energy generated by the gas combustion is not only used to heat the pot , and a considerable part escapes into the surrounding environment, causing energy waste; in order to solve the above problems, some heat and energy gathering have appeared in China in recent years, such as the "energy gathering ring for gas stoves and Its gas stove”, the energy-gathering ring is an energy-saving component that surrounds the burner and is arranged on the periphery of the burner. For a gas stove with an energy-gathering ring, due to the blocking of the energy-gathering ring, the lateral secondary energy provided to the burner is The air will be further affected. In addition, the secondary air supplementary channel of the gas stove with the energy gathering ring is lateral air intake, although the secondary air can be preheated when flowing through the secondary air supplementary channel of the energy gathering ring. However, due to the small preheating surface, the preheating effect of the secondary air is not good.

SUMMARY OF THE INVENTION

A technical problem to be solved by the present invention is to provide a heat shield for a stove which can provide preheated side secondary air to the burner in view of the above-mentioned current state of the art.

The second technical problem to be solved by the present invention is to provide a heat shield for stoves that ensures smooth and sufficient lateral secondary air provided to the burner.

The third technical problem to be solved by the present invention is to provide a gas cooker to which the above-mentioned heat shield for cooker is applied in view of the above-mentioned current state of the prior art.

The fourth technical problem to be solved by the present invention is to provide a gas cooker that can reasonably distribute the secondary air entering through the side of the heat shield for the cooker in view of the above-mentioned current state of the art.

The technical solution adopted by the present invention to solve the above technical problems is as follows: the heat shield for a stove includes an annular cover body, an annular cavity is formed in the center of the cover body, and the cover body is double-layered and has a cavity, It is characterized in that: the cover body is provided with air outlet holes connecting the annular cavity and the cavity at intervals along the circumferential direction on the inner side wall forming the annular cavity, and the cover body is on the outer side wall or the bottom wall. Then, there are air inlet holes for outside air to flow into the cavity.

In order to ensure that the side secondary air provided by the heat shield for the stove to the burner is smooth and sufficient, the air intake hole is connected to an external air supply part. Preferably, the air supply part can be a blower.

In order to supplement the secondary air correspondingly to the fire outlet areas of the inner ring fire cover and the outer ring fire cover of the burner, the inner side wall of the cover body has an annular inner step, and the air outlet holes include upper and lower rows of intervals The first air outlet and the second air outlet are provided, wherein the first air outlet of the upper row is located on the first wall surface above the step, and the second air outlet of the lower row is located on the second wall surface below the step. The first air outlet is more targeted to supplement the secondary air in the fire outlet area of the outer ring fire cover, and the second air outlet is more targeted to supplement the secondary air in the fire outlet area of the inner ring fire cover.

In order that the heat shield for the stove can better contain the overflowing liquid, the upper surface of the step is gradually inclined downward from the inside to the outside in the radial direction to form a liquid-containing area.

In order to prevent both the inner and outer fire covers from entraining secondary air through the lateral secondary air supply channel of the heat shield, at least one partition is provided in the liquid holding area, and the partition can The area is divided into at least two relatively independent spaces. The space separated by the partition can be targeted for supplementing the lateral secondary air supply channel of the burner, and the first air outlet separated by the partition can better serve the fire outlet of the outer ring fire cover. supplementary air.

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

In order to have a directional guiding effect on the secondary air, the supply resistance of the secondary air to the outer ring flame is reduced, so that the secondary air can be supplied more quickly, and the top end of the first wall between the two side plates faces upward. Protruding, the upper surface of the top end facing the bottom of the cover body is gradually inclined downward from the inside to the outside.

In order to supplement the secondary air for the outer ring fire cover with the fire outlet both inside and outside, the top end face is provided with a second space in fluid communication with the cavity on the wall surface adjacent to the annular cavity along the circumferential direction. Three vents. The third air outlet is more targeted to supplement the inner fire area of the outer ring fire cover.

In order to enable the secondary air flowing out of the air outlet of the cover body to be effectively preheated, the cavity of the cover body is also provided with a vertical annular partition, and the lower end edge of the partition plate is connected to the bottom of the cover body. The lower surface of the air conditioner has a gap, the partition divides the cavity into an air outlet cavity located on the inside and a preheating cavity located on the outside, the preheating cavity contains a preheating channel for preheating secondary air, and the The air inlet of the preheating channel is directly communicated with the air intake hole, and the preheating channel is provided with an air outlet that is in fluid communication with the air intake hole adjacent to the gap. In order to increase the contact area between the preheating channel and the preheating cavity, the preheating channel is in the shape of a spiral disc.

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

In order to better realize the liquid pan in which the heat shield can be stably placed on the panel of the gas stove, the lower surface of the bottom of the cover is provided with a foot, and the bottom of the foot is located on a plane lower than the air outlet cavity. The plane on which the bottom is located.

In order to facilitate the support of pots and pans, pot feet are fixed on the periphery of the top of the cover body.

In order to solve the second technical problem, the present invention provides a gas stove applied with the above-mentioned heat shield for the stove, including a gas stove panel and a burner, and the burner includes:

pedestal;

The inner ring fire cover is arranged on the base and forms a central air mixing chamber with the base;

The outer ring fire cover is also arranged on the base, is located on the periphery of the inner ring fire cover, and forms an outer ring air mixing chamber with the base; a supplementary air mixing chamber is formed between the central air mixing chamber and the outer ring air mixing chamber an air cavity; the base is also provided with a plurality of radial secondary air supply channels for connecting the air supply cavity and the outside world at intervals along the circumferential direction;

It is characterized in that: the annular cavity of the heat shield surrounds the burner and rests on the panel of the gas stove, and the partitions of the liquid holding area of the cover body are aligned with the secondary air supply channel one by one.

In view of the particularity of the outer ring fire cover with two fire rings, the outer ring fire cover includes an annular body and a main cover plate covering it, and the body includes a concentrically arranged middle ring area and an outer ring area;

The middle ring area is provided with main fire holes which communicate with the outer ring gas mixing chamber and are formed at intervals along the circumferential direction; on the outer ring area along the same edge of the body, there are a plurality of upper protruding holes on the surface of the body. The gap between adjacent bosses forms a gap that communicates with the middle ring area, the gap is also aligned with the partitions one by one, and each boss is formed with radial directions at intervals along the circumferential direction. The main fire tank, the second air outlet is connected to the outer wall area of the central air mixing chamber through the secondary air supply channel, the third air outlet is connected to the main fire hole of the middle ring area through the gap, The first air outlet is communicated with the main fire groove of the outer ring area. Since the middle ring area of the outer ring fire cover needs a lot of secondary air, the first air outlet and the third air outlet located in the two vertical side plates of the partition can pass through the gap between the adjacent bosses to the outside of the middle ring area. The secondary air is supplemented to ensure sufficient combustion of the middle ring; secondary air is supplemented to the outer ring area of the outer ring fire cover through the first air outlet located outside the two vertical side plates of the partition, The secondary air is supplemented to the outer wall area of the central air mixing chamber of the inner ring fire cover through the secondary air supply channel to the second air outlet in the side plate.

In order to facilitate the positioning of the main cover plate, the middle ring area of the main body has two parts, an inner ring part and an outer ring part, the top of the inner ring part is higher than the top of the outer ring part, and the main fire hole axially penetrates through it. The top surface of the inner ring portion, the main cover plate is located on the outer ring portion and the inner edge is abutting against the outer side of the inner ring portion, and the outer edge of the main cover plate is matched with the main fire groove of the boss The side fire holes are respectively formed.

In order to prevent the side fire holes of the outer ring fire cover from leaving the flame, radial flame stabilization grooves are formed on each of the bosses at intervals along the circumferential direction. The flame stabilization grooves are arranged at intervals from the main fire grooves. The outer edge of the main cover plate cooperates with the flame stabilization groove of the boss to form a flame stabilization hole, and the outer edge of the main cover plate extends downward to form a waterproof eaves that cover the side fire hole and the flame stabilization hole. .

In order to better supply gas to the outer ring fire cover, at least two through holes for gas to pass through are opened on the horizontal connection part of the body connecting the middle ring area and the outer ring area.

Further, the base is provided with a central gas channel that communicates with the central gas mixing chamber and an outer ring gas channel that communicates with the outer ring gas mixing chamber, the central gas channel is communicated with the central ejection pipe, and the The outer ring gas channel is communicated with the outer ring ejector tube.

In order for the air supplied from the air supply part to enter the heat shield to be effectively preheated, the preheated secondary air can be diverted to part of the central ejection pipe and the outer ring ejection pipe to provide the burner with the preheated primary air. air to effectively improve the utilization rate of gas. Therefore, the present invention provides a preferred improvement solution. The air supply part is located outside the central ejection pipe and the outer ring ejection pipe, and the preheating channel is also provided with a first split port spaced apart from the air inlet, the cover body is provided with a second split port corresponding to the first split port, and the second split port is connected to the central ejection pipe and/or through a pipeline Or the inlet end of the outer ring ejector tube is connected.

Compared with the prior art, the advantage of the present invention is that the heat shield is provided with an air intake hole for the outside air to flow into the cavity of the heat shield, so that the outside air entering the heat shield can be effectively preheated, and the secondary heat after preheating can be effectively preheated. The air can be shunted out by the air outlet to provide preheated secondary air for the burner, so as to effectively improve the utilization rate of gas, and the present invention also provides a gas stove using the above-mentioned heat shield, which The partition on the heat shield can independently supplement the secondary air for the inner and outer rings, effectively avoiding the unreasonable distribution of the secondary air with excess secondary air in the inner ring and insufficient secondary air in the outer ring. The secondary air is forcibly divided, so that the inner and outer rings can be fully burned, especially suitable for the outer ring fire cover with two ring fires. On the other hand, it can effectively supplement the secondary air for the first ring fire near the inner ring between the two ring fires of the outer ring fire cover, which has accurate positioning and improves the combustion efficiency of gas. The heat from the air chamber further preheats the secondary air and helps to improve the thermal efficiency of the burner.

Description of drawings

1 is a schematic structural diagram of a heat shield for a stove in an embodiment of the present invention;

Fig. 2 is the sectional view of Fig. 1;

3 is a schematic diagram of a heat shield placed on a gas stove in an embodiment of the present invention;

Fig. 4 is the sectional view of Fig. 3;

5 is a schematic structural diagram of a burner in an embodiment of the present invention;

Fig. 6 is the exploded structure schematic diagram of Fig. 5;

7 is a schematic structural diagram of an outer ring fire cover body in an embodiment of the present invention.

Detailed ways

The present invention will be further described in detail below with reference to the embodiments of the accompanying drawings.

As shown in Figures 1 to 7, it is the best embodiment of the present invention. The heat shield for the stove in this embodiment is not a heat shield in the prior art, and can be connected to an external air supply part 8 such as a blower. The air provided from the air supply part 8 can be effectively preheated when entering the heat shield, and the preheated secondary air can be shunted out by the air outlet to provide the preheated secondary air for the burner, so as to effectively improve the utilization rate of gas. . Specifically, it includes an annular cover body 1 , an annular cavity 10 is formed in the center of the cover body 1 , the cover body 1 is double-layered and has a cavity 11 , and the cover body 1 is spaced circumferentially on the inner side wall 101 forming the annular cavity 10 . There is an air outlet connecting the annular cavity 10 and the cavity 11, and the outer side wall 102 of the cover body 1 is provided with an air intake hole (not shown in the figure) for the outside air to flow into the cavity 11. Of course, it can also be arranged at the bottom. on the wall 103. In order to supplement the 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 has an annular inner step 14, and the air outlet holes include upper and lower rows arranged at intervals The first air outlet 121 and the second air outlet 131 in the upper row are located on the first wall 12 above the step 14, and the second air outlet 131 in the lower row is located on the second wall below the step. The wall surface 13, wherein the first air outlet 121 is more targeted to supplement the secondary air in the fire outlet area of the outer ring fire cover 7, and the second air outlet 131 is more targeted for secondary air to the fire outlet area of the inner ring fire cover 6. supplement. In order for the heat shield for the stove to better contain the overflowing liquid, the upper surface of the step 14 is gradually inclined downward from the inside to the outside in the radial direction to form a liquid-containing area 141 .

In order to prevent both the inner and outer fire covers from entraining the secondary air through the side secondary air supply channel 51 of the air mixing chamber, at least one partition 2 is arranged in the liquid holding area 141 at intervals along the circumferential direction. The partition 2 can The liquid-containing area 141 is divided into at least two relatively independent spaces, wherein the space separated by the partition 2 can be targeted to supply air to the fire outlet area of the inner ring fire cover 6 through the lateral secondary air supply channel 51, The first air outlet 121 separated by the partition member 2 can better supplement the secondary air for the fire outlet area of the outer ring fire cover 7. From the perspective of ease of installation, preferably, the partition member 2 includes a vertical air outlet. The two side plates are arranged at intervals, and there is a gap 17 connecting the annular cavity 10 and the cavity 11 of the cover body 1 between the two side plates. In order to enable the space separated by the partition 2 to have a directional guiding effect on the secondary air, reduce the supply resistance of the secondary air to the outer ring flame, and make the secondary air supply more quickly, the first wall 12 is located between the two sides. The top end surface 123 between the side plates of the blocks protrudes upward, and the top end surface 123 slopes downward gradually from the inside to the outside toward the upper surface 15 of the bottom of the cover body 1 . The key point of the present invention is also that the burner in the prior art has an inner ring fire cover 6 and an outer ring fire cover 7, the outer ring fire cover 7 generally only has one ring fire, and the outer ring fire cover 7 has two fire rings. In this case, the supplement of secondary air in the two rings of the outer ring fire cover 7 near the inner ring is particularly critical. For this reason, the top end surface 123 of the first wall surface 12 of the heat shield is adjacent to the annular cavity. The wall surface of 10 is provided with third air outlet holes 1231 in fluid communication with the cavity 11 at intervals along the circumferential direction. A ring of fire carries out targeted secondary air supplementation. In addition, in order to enable the secondary air flowing out of the air outlet 31 of the cover body 1 to be effectively preheated, a vertical annular partition 111 is also provided in the cavity 11 of the cover body 1. The lower end edge of the partition plate 111 is connected to the cover. The lower surface 16 of the bottom of the body 1 has a gap 17, and the partition 111 divides the cavity 11 into an air outlet cavity 111 located on the inner side and a preheating cavity 112 located on the outer side. Passage 3, the air inlet of the preheating passage 3 is directly communicated with the air inlet hole, and the preheating passage 3 is provided with an air outlet 31 that is in fluid communication with the air inlet hole adjacent to the gap 17. In this embodiment, in order to increase the preheating passage 3. The contact area with the preheating cavity 112, the preheating channel 3 is in the shape of a spiral disk, and in order to buffer the secondary air flowing out of the preheating cavity 112, the bottom of the air outlet cavity 111 is more than the lower surface 16 of the bottom of the cover body 1. In order to protrude, the air outlet holes are correspondingly arranged in the air outlet cavity 111. Meanwhile, in order to better realize that the heat shield can be placed on the liquid pan 20 of the gas stove panel 4 smoothly, the lower surface 16 of the bottom of the cover body 1 is provided with There are feet 161, and the bottom of the feet 161 is slightly lower than the plane of the bottom of the air outlet cavity 111. In order to facilitate the support of the pot, pot feet 18 are fixed on the periphery of the top of the cover 1.

As shown in FIG. 3 , which is a schematic diagram of the heat shield placed on the gas stove, the gas stove includes a gas stove panel 4 and a burner, wherein the burner includes a base 5 and an inner ring arranged on the base 5 . Fire cover 6, a central air mixing chamber 61 is formed between the inner ring fire cover 6 and the base 5, and an outer ring fire cover 7 is also arranged on the base 5, and the outer ring fire cover 7 is located in the inner ring fire cover 6, and form an outer ring air mixing chamber 71 with the base 5, and form a supplementary air cavity 70 between the central air mixing chamber 61 and the outer ring air mixing chamber 71; There are a plurality of radial secondary air supply channels 51 for connecting the air supply cavity 70 with the outside world; the annular cavity 10 of the heat shield surrounds the burner and rests on the gas stove panel 4, and the cover body 1 contains a liquid area 141. The space separated by the two vertical side plates of the partition 2 is aligned with the secondary air supply channel 51 one by one, so that the space separated by the partition 2 can be directed inward through the lateral secondary air supply channel 51. The fire outlet area of the ring fire cover 6 is supplemented with air, and the first air outlet 121 separated by the partition 2 can better supplement the secondary air for the fire outlet area of the outer ring fire cover 7 . Specifically, the outer ring fire cover 7 of this embodiment is also relatively special. The outer ring fire cover 7 includes an annular body 72 and a main cover plate 73 covering it. The body 72 includes a concentrically arranged middle ring area 721 and an outer ring Ring area 722; the middle ring area 721 is provided with main fire holes 7211 that communicate with the outer ring gas mixing chamber 71 and are formed at intervals along the circumferential direction; The bosses 7221 protruding from the surface of the main body 72, the intervals between the adjacent bosses 7221 form gaps 7222 that communicate with the middle ring area 721, the gaps 7222 are also aligned with the partitions 2 one by one, and each boss 7221 is spaced along the circumferential direction. A radial main fire groove 7223 is formed in the ground, the second air outlet 131 is connected to the outer wall area of the central air mixing chamber 61 through the secondary air supply channel 51, and the third air outlet 1231 is connected to the main fire hole 7211 of the middle ring area 721 through the gap 7222. , the first air outlet 121 communicates with the main fire groove 7223 of the outer ring area 722 . The middle ring area 721 of the main body 72 has two parts: 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. The main fire hole 7211 axially penetrates the top surface of the inner ring part 7212. The cover plate 73 is located on the outer ring portion 7213 and the inner edge 731 abuts against the outer side of the inner ring portion 7212. The outer edge 732 of the main cover plate 73 cooperates with the main fire groove 7223 of the boss 7221 to form side fire holes, respectively. Fire from the ground, each boss 7221 is formed with radial flame stabilizing grooves 7224 at intervals along the circumferential direction. The flame stabilizing groove 7224 is spaced from the main fire groove 7223. The flame grooves 7224 cooperate to form flame stabilization holes respectively. The size of the outlet formed by the respective gaps 17 of the main fire groove 7223 and the flame stabilization groove 7224 determines the size of the side fire and the flame stabilization. The size of the outlet can be determined according to the design requirements. The groove depths of the grooves 7223 and the flame stabilization grooves 7224 can be different, which can form a gap 17 for better supplementary secondary air, and the outer edge 732 of the main cover plate 73 extends downward to form a shield above the side fire holes and the flame stabilization holes. Due to the impact of the gas through the waterproof eaves, the gas flows out and burns, and the airflow speed is low, which also plays a very good role in stabilizing the flame.

Since the middle ring area 721 of the outer ring fire cover 7 requires a large amount of secondary air, it can pass through the first air outlet 121 and the third air outlet 1231 located in the two vertical side plates of the partition 2 to pass through the space between the adjacent bosses 7221. The gap 7222 supplements the secondary air to the outside of the middle ring area 721 to ensure sufficient combustion of the middle ring; The secondary air is supplemented, and 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 outlet 131 located in the two vertical side plates of the partition 2 through the secondary air supply channel 51 . 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 on the horizontal connection part 723 of the main body 72 connecting the middle ring area 721 and the outer ring area 722. The base 5 is provided with a central gas channel 52 that communicates with the central gas mixing chamber 61, and an outer ring gas channel 53 that communicates with the outer ring gas mixing chamber 71. The central gas channel 52 communicates with the central ejection pipe 521, and the outer ring gas channel 53 communicates with The outer ring ejection tube 531 communicates with each other. Finally, in order for the air supplied from the air supply part 8 to enter the heat shield to be effectively preheated, the preheated secondary air can be diverted to a part to enter the central injection pipe 521 and the outer ring injection pipe 531 to provide the burner After preheating, the primary air is used to effectively improve the utilization rate of gas. It also includes an air supply part 8 located outside the central ejection pipe 521 and the outer ring ejection pipe 531. The hot channel 3 is also provided with a first split port (not shown in the figure) spaced apart from the air inlet, and the cover body 1 is provided with a second split port (not shown in the figure) corresponding to the first split port. The split port communicates with the central ejection pipe 521 through the first pipe 81 and with the gas inlet end of the outer ring ejection pipe 531 through the second pipe 82 .

The specific process is as follows. When the air supply part 8 located under the gas stove panel 4 , such as a blower, first enters the preheating passage 3 arranged in the preheating chamber 112 of the heat shield, and is preheated through the preheating passage 3 of the heat shield. The secondary air can be divided into two paths and enter the air inlet ends of the central ejection pipe 521 and the outer ring ejection pipe 531 respectively, so as to provide the preheated primary air for the burner, and the premixed primary air and fuel gas are distributed After that, the gas enters the main fire hole 7211, the side fire hole and the flame stabilization hole of the outer ring fire cover 7 from the outer ring gas channel 53 and flows out, and another gas enters the inner ring fire cover 6 from the central gas channel. , and then flows out from the inner ring fire hole on the inner ring fire cover 6, and the air entering the preheating channel 3 flows out from the air outlet hole of the air outlet cavity 111 after preheating, wherein the annular cavity 10 of the heat shield surrounds the combustion The burner is placed on the gas stove panel 4, and the partition 2 of the liquid-containing area 141 is used to align with the secondary air supply channel 51 of the burner one by one, so that the first air outlet holes located in the two vertical side plates of the partition 2 are arranged one by one. 121 and the third air outlet 1231 supplement secondary air to the outside of the middle ring area 721 through the gap 7222 between the adjacent bosses 7221 to ensure sufficient combustion of the middle ring; The air outlet 121 supplements the secondary air in the outer ring area 722 of the outer ring fire cover 7, and the secondary air is supplied to the inner ring through the secondary air supply channel 51 through the second air outlet 131 located in the two vertical side plates of the partition 2. The outer wall area of the central air mixing chamber 61 of the cover 6 is supplemented with secondary air, and the independent air supply channel can effectively prevent the hot air flow after combustion and the high temperature of the burner from entraining the secondary air that is supplied to the inner ring, preventing the internal The secondary air between the ring and the outer ring affects each other.

Claims (19)

1. A heat shield for a stove, comprising an annular cover body (1), an annular cavity (10) is formed in the center of the cover body (1), and the cover body (1) is double-layered and has a hollow space. A cavity (11) is characterized in that: on the inner side wall (101) forming the annular cavity (10), the cover body (1) is spaced apart in the circumferential direction to communicate with the annular cavity (10) and the For the air outlet hole of the cavity (11), the outer side wall (102) or the bottom wall (103) of the cover body (1) is provided with an air inlet hole for the outside air to flow into the cavity (11). 2 . The heat shield for a stove according to claim 1 , wherein the air inlet hole is connected to an external air supply part ( 8 ). 3 . 3. The heat shield for a stove according to claim 1 or 2, characterized in that: the inner side wall of the cover body (1) has an annular inner step (14), and the air outlet includes two rows of upper and lower intervals. The first air outlet (121) and the second air outlet (131) are provided, wherein the first air outlet (121) of the upper row is located on the first wall surface (12) above the step (14), and the lower row of the first air outlet (121) is located on the first wall (12) above the step (14). The second air outlet (131) is located on the second wall surface (13) below the step. 4. The heat shield for a stove according to claim 3, wherein the upper surface of the step (14) is gradually inclined downward from the inside to the outside in the radial direction to form a liquid-containing area (141). 5 . The heat shield for a stove according to claim 4 , wherein at least one partition ( 2 ) is provided in the liquid holding area ( 141 ), and the partition ( 2 ) can store the The liquid region (141) is divided into at least two relatively independent spaces. 6 . The heat shield for a stove according to claim 5 , wherein the partition ( 2 ) comprises two side plates arranged at a vertical interval, and the two side plates have a communication between the two side plates. 7 . A gap (17) between the annular cavity (10) and the cavity (11) of the cover body (1). 7. The heat shield for a stove according to any one of claims 4 to 6, wherein the top end surface (123) of the first wall surface (12) between the two side plates is upwardly convex out, the top end surface (123) is gradually inclined downward from the inside to the outside toward the upper surface (15) of the bottom of the cover body (1). 8. The heat shield for a stove according to claim 7, characterized in that: the top end surface (123) is circumferentially spaced apart from the cavity on the wall surface adjacent to the annular cavity (10). (11) A third air outlet (1231) in fluid communication. 9 . The heat shield for a stove according to claim 8 , wherein a vertical annular partition plate ( 111 ) is further provided in the cavity ( 11 ) of the cover body ( 1 ). There is a gap (17) between the lower end edge of the plate (111) and the lower surface (16) of the bottom of the cover body (1), and the partition plate (111) divides the cavity (11) into an air outlet cavity located inside (111) and a preheating cavity (112) located on the outside, the preheating cavity (112) contains a preheating channel (3) for preheating secondary air, and the air inlet of the preheating channel (3) is directly It communicates with the air inlet hole, and the preheating channel (3) is provided with an air outlet (31) in fluid communication with the air inlet hole adjacent to the gap (17). 10 . The heat shield for a stove according to claim 9 , wherein the bottom of the air outlet cavity ( 111 ) is more protruding than the lower surface ( 16 ) of the bottom of the cover body ( 1 ), and the The air outlet holes are correspondingly arranged in the air outlet cavity (111). 11 . The heat shield for a stove according to claim 10 , wherein the lower surface ( 16 ) of the bottom of the cover body ( 1 ) is provided with a foot ( 161 ), and the bottom of the foot ( 161 ) is located where the bottom of the foot ( 161 ) is located. 12 . The plane is lower than the plane where the bottom of the air outlet cavity (111) is located. 12. The heat insulation cover for a stove according to claim 1 or 2, characterized in that: a pot support (18) is fixed on the periphery of the top of the cover body (1). 13. A gas stove to which the above-mentioned heat shield for a stove according to any one of claims 8 to 11 is applied, comprising a gas stove panel (4) and a burner, wherein the burner comprises: base (5); The inner ring fire cover (6) is arranged on the base (5), and forms a central air mixing chamber (61) with the base (5); The outer ring fire cover (7) is also arranged on the base (5), is located on the periphery of the inner ring fire cover (6), and forms an outer ring gas mixing chamber (71) with the base (5); A supplementary air cavity (70) is formed between the central air mixing chamber (61) and the outer ring air mixing chamber (71); the base (5) is also provided with a plurality of radial spacers for a secondary air supply channel (51) that communicates the air supply cavity (70) with the outside; It is characterized in that: the annular cavity (10) of the heat shield surrounds the burner and rests on the gas stove panel (4), and the partition (2) of the liquid-containing area (141) of the cover body (1) ) are aligned with the secondary air supply channels (51) one by one. 14. The gas stove according to claim 13, characterized in that: the outer ring fire cover (7) comprises an annular body (72) and a main cover plate (73) covering it, the body (72) ) includes a central ring area (721) and an outer ring area (722) arranged concentrically; The middle ring area (721) is provided with main fire holes (7211) that communicate with the outer ring gas mixing chamber (71) and are formed at intervals along the circumferential direction; 72) are spaced with a plurality of bosses (7221) protruding from the surface of the main body (72), and the interval between adjacent bosses (7221) forms a gap (7222) that communicates with the middle ring area (721). , the gaps (7222) are also aligned with the partitions (2) one by one, and radial main fire grooves (7223) are formed on each of the bosses (7221) at intervals along the circumferential direction. The second air outlet (131) communicates with the outer wall area of the central air mixing chamber (61) through the secondary air supply channel (51), and the third air outlet (1231) communicates with the outer wall through the gap (7222). The main fire hole (7221) of the middle ring area (721), the first air outlet (121) communicates with the main fire groove (7223) of the outer ring area (722). 15. The gas stove according to claim 14, characterized in that: the middle ring area (721) of the main body (72) has two parts, an inner ring part (7212) and an outer ring part (7213), the inner ring part The top of (7212) is higher than the top of the outer ring portion (7213), the main fire hole (7211) axially penetrates the top surface of the inner ring portion (7212), and the main cover plate (73) is Located on the outer ring part (7213) and the inner edge (731) of the inner ring part (7212) is in contact with the outer edge (732) of the main cover plate (73) The main fire grooves (7223) cooperate to form side fire holes respectively. The gas stove according to claim 15, characterized in that: radial flame stabilization grooves (7224) are formed on each of the bosses (7221) at intervals along the circumferential direction, and the flame stabilization grooves (7224) ) is spaced apart from the main fire groove (7223), and the outer edge (732) of the main cover plate (73) cooperates with the flame stabilization groove (7224) of the boss (7221) to form flame stabilization holes, respectively, and The outer edge (732) of the main cover plate (73) extends downward to form a waterproof eaves that cover the side fire holes and the flame stabilization holes. 17. The gas stove according to claim 15, characterized in that: a horizontal connecting portion (723) in the main body (72) connecting the middle ring area (721) and the outer ring area (722) is provided with a At least two through holes (7231) for gas to pass through. 18. The gas stove according to any one of claims 13 to 17, wherein the base (5) is provided with a central gas channel (52) that communicates with the central gas mixing chamber (61) , communicate with the outer ring gas channel (53) of the outer ring gas mixing chamber (71), the central gas channel (52) is communicated with the central ejection pipe (521), the outer ring gas channel (53) is connected with the outer ring gas channel (53) The ring ejector (531) communicates. 19. The gas stove according to claim 18, characterized in that: the gas supply part (8) is located outside the central ejection pipe (521) and the outer ring ejection pipe (531), and the preheating The channel (3) is also provided with a first split port spaced apart from the air inlet, the cover body (1) is provided with a second split port corresponding to the first split port, and the second split port passes through the The pipeline communicates with the gas inlet end of the central ejection tube (521) and/or the outer ring ejection tube (531).

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