CN104696962A - Outer fire cover, combustor and gas stove - Google Patents

Abstract

The invention discloses an outer fire cover for a burner, which includes a first side and a second side connected to the first side, and the outer fire cover has a fire cover located between the first side and the second side. The first side is opened with an inner fire channel, and the second side is opened with an outer fire hole. The outer fire cover includes air distribution ribs, which are located in the gas chamber and separate the gas chamber into a first chamber and a second chamber, the first chamber communicates with the inner fire passage, and the second chamber communicates with the inner fire channel. The outer fire hole is connected. In the above-mentioned outer fire cover, the function of the air-distributing rib is to independently divide the gas cavity containing the gas and air mixture in the outer fire cover into the first chamber and the second chamber, which are used for the mixing of gas and air in the two rings of the outer fire cover. When the gas is sprayed out of the fire hole, the air flow does not interfere with each other, which is conducive to improving the stability of the combustion flame. The invention also discloses a burner and a gas cooker.

Description

Outer fire cover and burner and gas cooker

technical field

The invention relates to the field of home appliances, and more specifically, relates to an outer fire cover for a burner, a burner and a gas cooker.

Background technique

With the concept of energy saving and environmental protection being increasingly advocated and the new energy efficiency standards for gas cookers are about to be implemented, many gas cooker manufacturers are currently working on researching high-efficiency burners. The usual method is to reduce the firepower of the burner and the height of the pot support. Although this method can improve the thermal efficiency, the firepower is too small to satisfy the consumer's habit of stir-frying. Therefore, the research on high-firepower and high-efficiency burners will be the development trend of stoves in the future.

The outer ring of the burner on the market usually has a row of main fire holes or a flame stabilizing groove under the main fire holes. The burner with this structure usually has poor secondary air supply between the flames and is prone to yellow flames. The problem is that it is difficult to increase the firepower and the heat utilization rate is low, so it is difficult to improve the thermal efficiency.

In addition, high-efficiency burners on the market usually add several fire holes to the inner circle of the outer fire cover. However, due to flame interference or secondary air supplementation, yellow flames and harmful gases (such as carbon dioxide) in the flue gas may easily exceed the standard. In addition, if the flame hole is added to the inner circle of the outer fire cover, if the problem of the stable flow of the mixture of gas and air is not solved, the flow rate of the fire hole in the inner circle will be inconsistent with that of the fire hole in the outer circle, so that there will be noise when the flame is turned off. .

Contents of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the present invention needs to provide an outer fire cover, a burner and a gas cooker.

An outer fire cover for a burner, comprising a first side and a second side connected to the first side, the outer fire cover is provided with a gas cavity between the first side and the second side, the An inner fire channel is opened on the first side, and an outer fire hole is opened on the second side. The outer fire cover includes air distribution ribs, which are located in the gas chamber and divide the gas chamber into a first chamber and a second chamber, the first chamber communicates with the inner fire channel, and the second chamber communicates with the inner fire channel. The outer fire hole is connected.

In the above-mentioned outer fire cover, the function of the gas dividing rib is to independently divide the gas chamber containing the gas and air mixture in the outer fire cover into the first chamber and the second chamber, which are used for the mixing of gas and air in the two rings of the outer fire cover. When the gas is sprayed out of the fire hole, the air flow does not interfere with each other, which is conducive to improving the stability of the combustion flame.

In one embodiment, the inner fire passage forms an angle α with the radial center of the outer fire cover, and 45°≤α≤60°.

In one embodiment, the inner fire channel is an inner fire groove, and the outer fire hole includes a plurality of large holes and a plurality of small holes, and the plurality of large holes and the plurality of small holes are alternately distributed on the second side surface and Form a fire hole circle.

In one embodiment, the inner fire channel is an inner fire hole, and the outer fire hole includes a plurality of large holes, a plurality of first small holes and a plurality of second small holes, and the plurality of large holes and the plurality of first The small holes form a first fire hole ring, the plurality of second small holes form a second fire hole ring, the first fire hole ring is spaced from the second fire hole ring, and the plurality of second small holes are respectively connected to the plurality of fire hole rings. The large holes and the plurality of first small holes are alternately distributed on the second side surface.

In one embodiment, the height of the air-distributing ribs ranges from 4 mm to 8 mm.

A burner, comprising a furnace head, a gas distribution plate, an outer fire cover and an inner fire cover, the burner head is connected to the bottom of the gas distribution plate, the outer fire cover and the inner fire cover are arranged on the gas distribution plate, The outer fire cover includes a first side and a second side connected to the first side, the outer fire cover has a gas cavity between the first side and the second side, and the first side has an inner fire channel, and the second side is opened with an outer fire hole. The outer fire cover includes air distribution ribs, which are located in the gas chamber and divide the gas chamber into a first chamber and a second chamber, the first chamber communicates with the inner fire channel, and the second chamber communicates with the inner fire channel. The outer fire hole is connected.

In one embodiment, the inner fire passage forms an angle α with the radial center of the outer fire cover, and 45°≤α≤60°.

In one embodiment, the connection part includes a main body and a vane located on a side of the main body, and the vane is arranged tangentially relative to the center of the gas distribution disc.

In one embodiment, the vane forms an angle β with the radial direction of the burner center, and 20°≤β≤45°, and the cross section of the vane is in a triangular or trapezoidal structure.

A gas cooker includes the above-mentioned burner.

Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and comprehensible from the description of the embodiments in conjunction with the following drawings, wherein:

Fig. 1 is the exploded schematic diagram of the burner of preferred embodiment of the present invention;

Fig. 2 is a schematic plan view of a burner in a preferred embodiment of the present invention;

Fig. 3 is a schematic cross-sectional view of the burner of Fig. 2 along line III-III;

Fig. 4 is the three-dimensional schematic diagram of the gas distribution tray of the preferred embodiment of the present invention;

Fig. 5 is a schematic plan view of a gas distribution tray in a preferred embodiment of the present invention;

Fig. 6 is a schematic perspective view of an outer fire cover in a preferred embodiment of the present invention;

Fig. 7 is a schematic plan view of an outer fire cover in a preferred embodiment of the present invention;

Fig. 8 is a schematic cross-sectional view of the outer fire cover of Fig. 7 along the VIII-VIII line;

Fig. 9 is another perspective view of an outer fire cover in a preferred embodiment of the present invention;

Fig. 10 is another schematic plan view of the outer fire cover of the preferred embodiment of the present invention;

Fig. 11 is a schematic cross-sectional view of the outer fire cover of Fig. 10 along line XI-XI; and

Fig. 12 is a schematic plan view of a gas cooker in a preferred embodiment of the present invention.

The labeling of accompanying drawing is as follows: burner-100,308, burner head-102,310, gas distributor-104, inner fire cover-106, outer fire cover-108,200, the first air inlet pipe-110, the second inlet Trachea-112, air outlet part-114, second air intake passage-116, inner cavity-118, outer cavity-120, outer ring cavity-122, inner ring cavity-124, connection part-126, first inner ring Cavity-128, first outer ring cavity-130, second inner ring cavity-132, inner ring fire hole-134, inner ring mixing cavity-136, connecting channel-138, main body-140, blades-142, first side -144,202, second side -146,204, second outer ring chamber-148,206, outer ring mixing chamber-150, inner fire channel, inner fire hole-152,208, outer fire hole-154,210, Large hole-156, 212, the first small hole-158, the second small hole-160, the air distribution rib-162, 216, the first cavity-164, 218, the second cavity-166, 220, the ignition device-168, First bracket-170, second bracket-172, ignition pin-174, thermocouple-176, small hole-214, gas cooker-300, bottom case assembly 302, valve body assembly-304, nozzle-306.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the terms "first" and "second" are used for description purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of said features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; may be mechanically connected, may be electrically connected or may communicate with each other; may be directly connected, or indirectly connected through an intermediary, may be internal communication between two components or interaction between two components relation. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, components and configurations of specific examples are described below. Of course, they are only examples and are not intended to limit the invention. Furthermore, the present disclosure may repeat reference numerals and/or reference letters in different instances, such repetition is for the purpose of simplicity and clarity and does not in itself indicate a relationship between the various embodiments and/or arrangements discussed. In addition, various specific process and material examples are provided herein, but one of ordinary skill in the art may recognize the use of other processes and/or the use of other materials.

Referring to FIGS. 1-8 , a burner 100 according to a first preferred embodiment of the present invention includes a burner head 102 , a gas distributor 104 , an inner fire cover 106 and an outer fire cover 108 .

Please refer to FIG. 3 , the furnace head 102 is connected to the bottom of the gas distributor 104 . The burner head 102 can be connected with the gas inlet pipe of the gas cooker, so that the external gas can be supplied to the burner 100 . In this embodiment, the burner head 102 includes a first air inlet pipe 110 , a second air inlet pipe 112 and an air outlet portion 114 . The first air intake pipe 110 and the second air intake pipe 112 are connected to the bottom of the air outlet portion 114 .

The first air intake pipe 112 is provided with a first air intake passage (not shown in the figure), and the second air intake pipe 112 is provided with a second air intake passage 116 , as shown in FIG. 3 . The arrangement of the double intake channels is beneficial to realize the high firepower effect of the burner 100 .

Referring to FIG. 1 , the air outlet portion 114 is provided with an inner cavity 118 and an outer cavity 120 . The inner cavity 118 is hollow columnar. The outer cavity 120 is annular and disposed around the inner cavity 118 . The first air intake channel communicates with the outer cavity 120 , and the second air intake channel 116 communicates with the inner cavity 118 . Therefore, gas can enter the outer cavity 120 and the inner cavity 118 through the first intake passage and the second intake passage 116 respectively.

The air distribution plate 104 is disposed on the air outlet portion 114 , and the first air inlet pipe 110 and the second air inlet pipe 112 are connected to the bottom of the air distribution plate 104 through the air outlet portion 114 . Specifically, referring to FIG. 1 , and FIGS. 3 to 5 , the gas distribution plate 104 includes an outer ring cavity portion 122 , an inner ring cavity portion 124 and a connecting portion 126 .

The inner ring cavity portion 124 is a hollow cylindrical portion. The outer ring cavity portion 122 is annular, and the outer ring cavity portion 122 surrounds the inner ring cavity portion 124 . The connecting portion 126 connects the inner ring cavity portion 124 and the outer ring cavity portion 122 .

Referring to FIG. 1 and FIG. 3 , the inner ring cavity portion 124 defines a first inner ring cavity 128 , and the first inner ring cavity 128 communicates with the second air intake passage 116 through the inner cavity 118 . The outer ring cavity portion 122 defines a first outer ring cavity 130 , and the first outer ring cavity 130 communicates with the first intake passage through the outer cavity 120 .

Please refer to Figures 1 and 3, the inner fire cover 106 is provided with a second inner ring chamber 132 and an inner ring fire hole 134, and the inner ring fire hole 134 communicates with the second inner ring chamber 132 so that the Gas can be ejected outward through the inner ring fire holes 134 . The inner fire cap 10 is disposed on the inner ring cavity portion 124 , and the first inner ring cavity 128 and the second inner ring cavity 132 jointly form an inner ring mixing cavity 136 . The inner ring mixing chamber 136 communicates with the inner ring fire hole 134 , so that the mixture of gas and air can be sprayed outward from the inner ring mixing chamber 136 through the inner ring fire hole 134 to form the inner ring fire of the burner 100 after burning.

Referring to FIG. 1 and FIG. 4 , the connecting portion 126 is provided with a connecting channel 138 , and the connecting channel 138 communicates with the inner ring mixing chamber 136 . Specifically, the number of connecting parts 126 is four, and the four connecting parts 126 are connected between the inner ring cavity part 124 and the outer ring cavity part 122 at intervals. It can be understood that, in other embodiments, the number of the connecting parts 126 may be other numbers, such as 2 or more.

Referring to FIG. 2 , each connecting portion 126 includes a main body 140 and a vane 142 located on a side of the main body 140 . The main body 140 defines the connection channel 138 . In this embodiment, the number of the blades 142 is two, and the two blades 142 are located on opposite sides of the main body 140 . It can be understood that, in other embodiments, the number of blade 142 may be one, which is connected to one side of the main body 140 . The blade 142 has a triangular or trapezoidal cross-section. As shown in FIG. 5 , the cross-sectional area of the blade 142 increases gradually in a clockwise direction.

As shown in Fig. 5, each blade 142 is arranged tangentially relative to the center of the gas distribution plate 104, so that it can help to increase the entrainment effect of the burner 100 on the secondary air during combustion, increase the kinetic energy of the air, and solve the problem of combustion. The yellow flame phenomenon that occurs due to insufficient secondary air of the inner ring fire and the middle ring fire of the device 100.

Further, as shown in FIG. 4 , the vane 142 forms an angle β with the radial center of the burner 100 , and 20°≤β≤45°, preferably 30°. This angle range can further enhance the above-mentioned entrainment effect.

Referring to FIG. 3 , the outer fire cover 108 is disposed on the outer ring cavity portion 122 . The outer fire cover 108 includes a first side 144 and a second side 146 connected to the first side 144 . The outer fire cover 108 defines a second outer ring chamber 148 (gas chamber) located between the first side 144 and the second side 146 . The outer fire cover 108 is disposed on the outer ring cavity portion 122 such that the first outer ring cavity 130 and the second outer ring cavity 148 jointly form an outer ring mixing cavity 150 , see FIG. 3 . In this embodiment, the first side 144 is the inner side of the outer fire cover 108 , and the second side 146 is the outer side of the outer fire cover 108 .

Referring to FIG. 6 , the first side 144 is provided with an internal fire channel 152 . In this embodiment, the inner fire channel 152 is an inner fire hole, and the inner fire hole 152 communicates with the second outer ring chamber 148 and the outer ring mixing chamber 150 so that it is located in the second outer ring chamber 148 and the outer ring mixing chamber 150 The gas can be sprayed outwards through the inner fire hole 152. In this way, the mixed gas of gas and air can be sprayed outward from the second outer ring chamber 148 and the outer ring mixing chamber 150 through the inner fire hole 152 to form the middle ring fire of the burner 100 after burning.

Further, as shown in FIG. 7 , the inner fire hole 152 forms an angle α with the radial center of the outer fire cover 108 , and 45°≤α≤60°. The setting of this angle is beneficial to improve the thermal efficiency of the burner 100, and at the same time, it is beneficial to prevent the problem of excessive harmful gas (such as carbon dioxide) caused by flame interference caused by the concentricity of the middle ring fire and the inner ring fire. In addition, the middle ring fire also improves the air entrainment effect due to the tangential outward injection.

Referring to FIG. 6 , the second side 146 is provided with an outer fire hole 154 . The outer fire hole 154 communicates with the second outer ring chamber 148 and the outer ring mixing chamber 150 , so that the gas in the second outer ring chamber 148 and the outer ring mixing chamber 150 can be sprayed outward through the outer fire hole 154 . In this way, the mixed gas of gas and air can be injected from the second outer ring chamber 148 and the outer ring mixing chamber 150 through the outer fire hole 154 to form the outer ring fire of the burner 100 after burning.

In this embodiment, the outer fire hole 154 includes a plurality of large holes 156 , a plurality of first small holes 158 and a plurality of second small holes 160 . The diameter of the large hole 156 is larger than that of the first small hole 158 and the second small hole 160 , and the diameter of the first small hole 158 and the second small hole 160 may be the same or different.

See Fig. 6, the plurality of large holes 156 and the plurality of first small holes 158 form a first fire hole circle, the plurality of second small holes 160 form a second fire hole circle, and the first fire hole circle and the first fire hole circle The two fire hole rings are spaced apart, for example, the first fire hole ring and the second fire hole ring are spaced up and down on the second side 146 . The plurality of second small holes 160 and the plurality of large holes 156 and the plurality of first small holes 158 are alternately distributed on the second side surface 146 . Setting the outer flame hole 154 in this way is beneficial to improve the combustion stability of the outer ring fire, and prevent the phenomenon of flame separation when the gas pressure is unstable.

In addition, in the first fire hole circle, the multiple first small holes 158 are divided into multiple first small hole groups in groups of several, such as three. Each first group of small holes is disposed between a plurality of large holes 156 . Two adjacent first small hole groups are separated by several large holes 156 . Such arranging of the large hole 156 and the first small hole 158 in the first fire hole circle is conducive to further improving the stability of the outer ring fire combustion and preventing the phenomenon of flame separation when the gas pressure is unstable.

Referring to FIG. 8 , the outer fire cover 108 includes air distribution ribs 162 . The gas distribution rib 162 is located in the second outer ring cavity 148 and divides the second outer ring cavity 148 into a first cavity 164 and a second cavity 166, the first cavity 164 communicates with the inner fire hole 152, and the second cavity 164 communicates with the inner fire hole 152. The second cavity 166 communicates with the outer fire hole 154 . In this way, the effect of the gas-distributing rib 162 is to independently divide the second outer ring cavity 148 of the outer fire cover 108 containing gas and air mixture into a first cavity 164 and a second cavity 166, which are used for the middle ring fire and the second cavity of the outer fire cover 108. When the gas and air mixture of the outer ring fire is sprayed out of the fire hole, the air flow does not interfere with each other, which is beneficial to improving the stability of the combustion flame.

Further, the height H of the air-distributing rib 162 ranges from 4 mm to 8 mm, preferably 5 mm.

Referring to FIG. 1 , the burner 100 further includes an ignition device 168 mounted on the burner head 102 . Specifically, the first bracket 170 and the second bracket 172 are arranged on the outer wall of the gas outlet portion 114 of the burner 102 , and the ignition device 168 includes an ignition needle 174 and a thermocouple 176 . The ignition pin 174 passes through the first bracket 170 and can be fixed on the first bracket 170 by eg screws. The thermocouple 176 passes through the second bracket 172 and can be fixed on the second bracket 172 by eg screws. An ignition device 168 is disposed adjacent to the inner fire cover 106 .

When working, the gas enters the burner 100 from the furnace head 102, and the primary air enters the burner 100 through the gap between the gas distribution plate 104 and the gas outlet 114, and forms a mixed gas with the gas and enters the gas distribution plate 104. A part of the mixed gas Enter the inner ring mixing chamber 136 and spray outward through the inner ring fire hole 134, and burn to form an inner ring fire. The other part of the mixed gas enters the outer ring mixing chamber 150 through the connecting channel 138, and is ejected and burned from the first chamber 164 through the inner fire hole 152 to form a middle ring fire, and from the second chamber 166 to the outside through the outer fire hole 154. The jet burns to form an outer ring of fire.

In summary, the above-mentioned burner 100, the function of the gas distribution rib 162 of the outer fire cover 108 is to independently divide the second outer ring chamber 148 (gas chamber) of the outer fire cover 108 containing the gas and air mixture into the first chamber 164 and the second chamber 166 are used for the mixture of gas and air in the two-ring fire of the outer fire cover 108. When the gas and air are sprayed out of the fire hole, the air flow does not interfere with each other, which is beneficial to improve the stability of the combustion flame.

Please refer to FIG. 9 , the outer fire cover 200 of the second preferred embodiment of the present invention includes a first side 202 and a second side 204 connected to the first side 202 , and the outer fire cover 200 has a The second outer ring cavity 206 (gas cavity) between the second side surface 204 .

The first side 202 defines an internal fire channel 208 . In this embodiment, the inner fire channel 208 is an inner fire groove, and the inner fire groove 208 communicates with the second outer ring cavity 206 , so that the gas in the second outer ring cavity 206 can be sprayed outward through the inner fire groove 208 . In this way, the mixed gas of gas and air can be sprayed outward from the second outer ring chamber 206 through the inner fire groove 208, and burn to form the middle ring fire of the burner.

Further, as shown in FIG. 10 , the inner fire groove 208 forms an angle α with the radial center of the outer fire cover 200 , and 45°≤α≤60°. The setting of this angle is conducive to improving the thermal efficiency of the burner, and at the same time, it is beneficial to prevent the problem of excessive harmful gas (such as carbon dioxide) caused by flame interference caused by the concentricity of the middle ring fire and the inner ring fire of the burner. In addition, the fire in the middle ring of the burner also improves the air entrainment effect due to the tangential outward injection.

The second side 204 defines an outer fire hole 210 . The outer fire hole 210 communicates with the second outer ring cavity 206 , so that the gas in the second outer ring cavity 206 can be sprayed outward through the outer fire hole 210 . In this way, the mixed gas of gas and air can be sprayed outward from the second outer ring cavity 206 through the outer fire hole 210, and burn to form the outer ring fire of the burner.

In this embodiment, see FIG. 9 , the outer fire hole 210 includes a plurality of large holes 212 and a plurality of small holes 214 . The diameter of the large hole 212 is larger than that of the smaller hole 214 . The plurality of large holes 212 and the plurality of small holes 214 are alternately distributed on the second side surface 204 to form a ring of fire holes. The arrangement of the outer flame hole 210 in this way is beneficial to improve the combustion stability of the outer ring fire of the burner and prevent the phenomenon of flame separation when the gas pressure is unstable.

Referring to FIG. 11 , the outer fire cover 200 includes air distribution ribs 216 . The air distribution rib 216 is located in the second outer ring cavity 206 and divides the second outer ring cavity 206 into a first cavity 218 and a second cavity 220, the first cavity 218 communicates with the inner fire groove 208, and the second cavity 218 communicates with the inner fire groove 208. The second cavity 220 communicates with the outer fire hole 210 . In this way, the function of the gas-distributing rib 216 is to independently divide the second outer ring cavity 206 of the outer fire cover 200 containing gas and air mixture into a first cavity 218 and a second cavity 220 for the middle ring fire and the second cavity of the outer fire cover 200. When the gas and air mixture of the outer ring fire is sprayed out of the fire hole, the air flow does not interfere with each other, which is beneficial to improving the stability of the combustion flame.

Further, the height H of the air-distributing ribs 216 ranges from 4 to 8 millimeters, preferably 5 millimeters.

To sum up, in the above-mentioned outer fire cover 200, the function of the gas-distributing rib 216 is to independently divide the second outer ring chamber 206 of the outer fire cover 200 containing gas and air mixture into a first chamber 218 and a second chamber 220, The mixed gas of gas and air used for the two-ring fire of the outer fire cover 200 does not interfere with each other when it is sprayed out of the fire hole, which is beneficial to improving the stability of the combustion flame.

Referring to FIG. 12 , a gas cooker 300 according to a third preferred embodiment of the present invention includes a bottom case assembly 302 , a valve body assembly 304 , a nozzle 306 and a burner 308 . In this embodiment, the number of burners 308 is 2, and the number of nozzles 306 is 4. Every 2 nozzles 306 are connected to the burner 310 of a burner 308, so as to respectively feed the first air inlet channel and the burner 310 of the burner 310. The second intake channel injects gas.

The burner 308 and the valve body assembly 304 are mounted on the sump assembly 302 . The valve assembly 304 is connected to the nozzle 306 to control the on-off of gas and the amount of intake air.

The burner 308 can be selected from the burner of the above embodiment, and the outer fire cover of the burner 308 can be selected from any of the above embodiments.

In the description of this specification, reference to the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific examples", or "some examples" etc. A specific feature, structure, material, or characteristic described in an embodiment or an example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the invention is defined by the claims and their equivalents.

Claims (10)

1. the outer fire cover for burner, the second side comprising the first side and be connected with this first side, this outer fire cover offers the air chamber between this first side and this second side, this first side opening is provided with interior fiery passage, this second side opening is provided with outer fire hole, it is characterized in that, this outer fire cover comprises gas-separating rib, this gas-separating rib is positioned at this air chamber and this air chamber is divided into the first chamber and the second chamber, this first chamber and this interior fiery channel connection, this second chamber is communicated with this outer fire hole.

2. outer fire cover as claimed in claim 1, is characterized in that, this interior fiery passage and this outer fire cover radially at an angle alpha, and 45 °≤α≤60 °.

3. outer fire cover as claimed in claim 1, it is characterized in that, this interior fiery passage is interior fiery groove, and this outer fire hole comprises multiple macropore and multiple aperture, and the plurality of macropore and the plurality of aperture are interspersed on the second side and form a fire hole circle.

4. outer fire cover as claimed in claim 1, it is characterized in that, this interior fiery passage is interior fire hole, this outer fire hole comprises multiple macropore, multiple first aperture and multiple second orifice, the plurality of macropore and the plurality of first keyhole formation first fire hole circle, the plurality of second orifice forms the second fire hole circle, this first fire hole circle and this second fire hole circle interval, and the plurality of second orifice is interspersed on the second side with the plurality of macropore and the plurality of first aperture respectively.

5. outer fire cover as claimed in claim 1, it is characterized in that, the height span of this gas-separating rib is between 4 ~ 8 millimeters.

6. a burner, comprise burner, air distribution disk, outer fire cover and inner fire cover, this burner is connected to the bottom of this air distribution disk, this outer fire cover and this inner fire cover are arranged on this air distribution disk, the second side that this outer fire cover comprises the first side and is connected with this first side, this outer fire cover offers the air chamber between this first side and this second side, this first side opening is provided with interior fiery passage, this second side opening is provided with outer fire hole, it is characterized in that, this outer fire cover comprises gas-separating rib, this gas-separating rib is positioned at this air chamber and this air chamber is divided into the first chamber and the second chamber, this first chamber and this interior fiery channel connection, this second chamber is communicated with this outer fire hole.

7. burner as claimed in claim 6, is characterized in that, this interior fiery passage and this outer fire cover radially at an angle alpha, and 45 °≤α≤60 °.

8. burner as claimed in claim 6, it is characterized in that, this connecting portion comprises main body and is positioned at the blade of this main body side, and this blade is arranged in tangential relative to this air distribution disk center.

9. burner as claimed in claim 8, is characterized in that, this blade and this burner centre radial direction β at an angle, and 20 °≤β≤45 °, the structure that the cross section of this blade is triangular in shape or trapezoidal.

10. a gas kitchen ranges, is characterized in that, comprises the burner as described in any one of claim 6 ~ 9.