CN213713056U - Combustor and gas-cooker - Google Patents

Abstract

The utility model discloses a combustor and gas-cooker, include: the furnace end is provided with N first mixing cavities and N first injection pipes which are communicated with the N first mixing cavities in a one-to-one correspondence mode, the N first injection pipes are provided with curved injection paths, the N first injection pipes are circumferentially arranged below the N first mixing cavities, and N is a natural number larger than 2; first fire lid, with the furnace end is connected, first fire lid is equipped with N kinds of first fire holes, every kind first fire hole corresponds respectively and communicates one first hybrid chamber. The utility model discloses can reduce the volume of furnace end relatively, the burning of guarantee gas simultaneously is abundant, also can be used for realizing having avoided shortening because of flame and leading to the efficiency step-down, promotes user experience.

Description

Combustor and gas-cooker

Technical Field

The utility model is used for gas cooking utensils field especially relates to a combustor and gas-cooker.

Background

The combustor of current gas cooking utensils, generally through drawing penetrating the pipe with gas and air introduction combustor, the pipe that draws of current combustor leads to drawing the effect not good owing to arrange the restriction in space, especially has a plurality of combustors that draw and penetrate the pipe, and the mixture of gas and air is not abundant enough, can't guarantee to introduce sufficient air, and the burning of gas is not abundant.

Meanwhile, the burner of the existing gas cooker is generally provided with an outer ring fire cover and an inner ring fire cover, and the fire distribution of the burner is generally divided into a plurality of gears such as soup cooking small fire, heat preservation fire, frying fire, quick frying fire and the like. When the firepower is adjusted from large to small, the flame of the outer ring is shortened, and the minimum flame of the inner ring is remained at last. The flame is shorter when the fire is not the maximum fire, the distance from the flame to a cooker is longer, and the heat efficiency is inevitably reduced; two such flame regulation modes, the user is difficult accurate to distinguish firepower size, needs the user to bow to see flame, relies on the sensation to adjust firepower, and user experience is relatively poor.

With the coming of the world energy crisis and the increasing of the environmental awareness of people, the efficiency and experience of gas have higher and higher requirements, and therefore, the combustor of the existing kitchen range needs to be further improved.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve one of the technical problem that exists among the prior art at least, provide a combustor and gas-cooker, can reduce the volume of furnace end relatively, ensure the burning of gas simultaneously abundant, also can be used for realizing having avoided shortening because of flame and leading to the efficiency step-down, promote user experience.

The utility model provides a technical scheme that its technical problem adopted is:

in a first aspect, a burner comprises:

the furnace end is provided with N first mixing cavities and N first injection pipes which are communicated with the N first mixing cavities in a one-to-one correspondence mode, the N first injection pipes are provided with curved injection paths, the N first injection pipes are circumferentially arranged below the N first mixing cavities, and N is a natural number larger than 2;

first fire lid, with the furnace end is connected, first fire lid is equipped with N kinds of first fire holes, every kind first fire hole corresponds respectively and communicates one first hybrid chamber.

With reference to the first aspect, in certain implementation manners of the first aspect, the N first mixing chambers are N annular chambers sequentially sleeved from outside to inside, and the N first ejector pipes are arranged in an area covered by lower ends of the N first mixing chambers.

With reference to the first aspect and the foregoing implementation manners, in some implementation manners of the first aspect, the fire lid further includes a second fire lid; the furnace head is also provided with a second mixing cavity and a second injection pipe communicated with the second mixing cavity, the second mixing cavity is positioned at the inner side of the innermost first mixing cavity at intervals, the axis of the second injection pipe is a transverse straight line segment, and the outlet of the second injection pipe is positioned between two of the first injection pipes.

With reference to the first aspect and the foregoing implementation manners, in some implementation manners of the first aspect, the furnace end is provided with M annular baffles, where M is N + 1; n first mixing chambers are N annular chambers with top openings formed by enclosing M annular baffles.

With reference to the first aspect and the foregoing implementation manners, in some implementation manners of the first aspect, the first injection pipe includes a first straight-tube section, a contraction section, and a diffusion section along an airflow direction, and the diffusion section is curved.

With reference to the first aspect and the foregoing implementation manners, in some implementation manners of the first aspect, a second straight-tube section is further disposed between the contraction section and the diffusion section.

With reference to the first aspect and the foregoing implementation manners, in some implementation manners of the first aspect, a rising inclined surface is arranged at the tail end of the first injection pipe, and the first injection pipe forms an injection outlet at the bottom of the first mixing cavity.

With reference to the first aspect and the foregoing implementation manners, in certain implementation manners of the first aspect, outlets of N kinds of the first fire holes are located at the same height of the first fire cover.

With reference to the first aspect and the foregoing implementation manners, in certain implementation manners of the first aspect, N types of the first fire holes are alternately distributed at intervals in the circumferential direction of the outer side surface of the first fire cover.

In a second aspect, a gas cooker comprises the burner of any one of the implementations of the first aspect.

One of the above technical solutions has at least one of the following advantages or beneficial effects:

make full use of furnace end's bottom space, with N first penetrate the pipe and arrange wherein, first penetrate the pipe and have curved drawing of drawing and penetrate the route, relative straight line shape mode of setting can effectively wholly reduce the volume of furnace end, also guarantees the mixing time of gas and air in first penetrating the pipe simultaneously, the mixed effect of guarantee gas and air, the burning of gas is abundant.

The first mixing cavity capable of being independently controlled is designed, so that combustion of the first fire hole is controlled by controlling gas entering the first mixing cavity. The fire hole number is adjusted to adjust the firepower, so that the situation that the energy efficiency is lowered due to the fact that flame is shortened is avoided. Moreover, the user can clearly change the fire respectively, and the user experience is better.

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

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is an exploded view of an embodiment of the burner of the present invention;

FIG. 2 is a front view of the structure of one embodiment shown in FIG. 1;

FIG. 3 is a cross-sectional view of the embodiment shown in FIG. 1 in an assembled state;

FIG. 4 is a sectional view of the embodiment shown in FIG. 1 in a disassembled state;

FIG. 5 is a schematic view of the structure of an exemplary fire hole No. 1 shown in FIG. 1;

FIG. 6 is a schematic view of an embodiment 2, 4 fire hole configuration shown in FIG. 1;

FIG. 7 is a schematic view of an example No. 3 fire hole configuration shown in FIG. 1;

FIG. 8 is a bottom schematic view of the embodiment shown in FIG. 1;

FIG. 9 is a schematic diagram of an embodiment of the eductor outlet of FIG. 1.

Detailed Description

This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.

In the present invention, if there is a description of directions (up, down, left, right, front and back), it is only for convenience of description of the technical solution of the present invention, and it is not intended to indicate or imply that the technical features indicated must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the utility model, the meaning of a plurality of is one or more, the meaning of a plurality of is more than two, and the meaning of more than two is understood as not including the number; the terms "above", "below", "within" and the like are understood to include the instant numbers. In the description of the present invention, if there is any description of "first" and "second" only for the purpose of distinguishing technical features, it is not to be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the precedence of the indicated technical features.

In the present invention, unless otherwise explicitly defined, the terms "set", "install", "connect", and the like are to be understood in a broad sense, and for example, may be directly connected or may be indirectly connected through an intermediate medium; can be fixedly connected, can also be detachably connected and can also be integrally formed; may be mechanically coupled, may be electrically coupled or may be capable of communicating with each other; either as communication within the two elements or as an interactive relationship of the two elements. The technical skill in the art can reasonably determine the specific meaning of the above words in the present invention by combining the specific contents of the technical solution.

Fig. 1 and fig. 2 show a reference direction coordinate system of an embodiment of the present invention, and the following describes an embodiment of the present invention with reference to directions shown in fig. 1 and fig. 2.

Referring to fig. 1, fig. 2 and fig. 8, the embodiment of the utility model provides a burner, including furnace end 1 and first fire lid 2, furnace end 1 is equipped with a N first hybrid chamber and draws a tub 4 with a N first of a hybrid chamber one-to-one intercommunication, and first drawing is drawn tub 4 and is used for introducing the first hybrid chamber that corresponds with the gas, and a N first draws a tub 4 and all has the route of drawing of curved form, and a N first draws a tub below of arranging in a plurality of first hybrid chambers along circumference, and N is for being greater than 2 natural numbers. First fire lid 2 is connected with furnace end 1, and first fire lid 2 is equipped with N kinds of first fire hole 21, and every kind of first fire hole 21 corresponds respectively and communicates a first hybrid chamber. The structure presented in the drawings of the application, wherein N is 3.

The embodiment of the utility model discloses a bottom space of make full use of furnace end 1 arranges N first injection pipe 4 wherein, and first injection pipe 4 has the curved route of drawing of form, and relative straight line shape sets up the mode, can effectively wholly reduce the volume of furnace end, also guarantees the mixing time of gas and air in first injection pipe simultaneously, ensures the mixed effect of gas and air, and the burning of gas is abundant.

Meanwhile, a first mixing chamber that can be independently controlled is designed to control combustion of the first fire holes 21 by controlling gas introduction of the first mixing chamber. The fire hole number is adjusted to adjust the firepower, so that the situation that the energy efficiency is lowered due to the fact that flame is shortened is avoided. Moreover, the user can clearly change the fire respectively, and the user experience is better.

The N first mixing cavities are N annular cavities which are sequentially sleeved from outside to inside, and the N first injection pipes are arranged in an area covered by the lower ends of the N first mixing cavities. The scheme is more reasonable in arrangement.

Referring to fig. 8, the first ejector tube 4 includes a first straight cylindrical section 41, a contraction section 42, a second straight cylindrical section 43, and a diffusion section 44 in the gas flow direction. The aperture of the contraction section 42 is gradually reduced by adopting a conical surface or an arc surface, and the aperture of the diffusion section 44 is gradually increased by adopting a conical surface or an arc surface. The first injection pipe 4 has a first straight cylindrical section 41, a contraction section 42, a second straight cylindrical section 43, and a diffusion section 44. Wherein, the aperture of contraction section 42 reduces gradually, and the aperture of diffusion section 44 increases gradually, and first drawing penetrates pipe 4 and gas nozzle and mutually supports, and first drawing penetrates 4 insidely under the condition that gas nozzle sprays the gas, forms the negative pressure, constantly inhales the air. This technical scheme is through drawing the pipe 4 to set up to first straight section 41, contraction section 42, the straight section of thick bamboo section 43 of second and diffusion section 44 with first, can promote air greatly and draw the ability of penetrating, and the combustion effect of gas is better. The second straight cylinder section 43 is provided to make the air flow more stable, which is beneficial to the combustion stability.

Referring to fig. 8, the utility model discloses an embodiment innovation draw the ejection of compact export to first drawing and penetrate pipe 4 improves, and first drawing penetrates pipe 4 and forms on the bottom of first hybrid chamber and lateral wall and draw and penetrate export 46, draws promptly to penetrate export 46 and comprises a horizontal plane and a vertically arc surface, so increased and penetrated export 46 area, reduced the flow resistance, be favorable to fluidic flow for the gas distributes more evenly.

Referring to fig. 1, 2 and 3, the furnace end 1 is provided with 3 first mixing cavities, each of the 3 first mixing cavities has an independent first injection pipe 4, and each first injection pipe 4 is used for introducing fuel gas into the corresponding first mixing cavity. First fire lid 2 is connected with furnace end 1, and first fire lid 2 is equipped with 3 kinds of first fire holes 21, and first fire hole 21 is main fire hole, and every kind of first fire hole 21 corresponds a first hybrid chamber, and first fire hole 21 is linked together with the first hybrid chamber that corresponds.

The embodiment of the utility model discloses an independently controllable's first hybrid chamber has been designed, and has arranged several kinds of first fire holes 21 that correspond with first hybrid chamber in same high position on first fire lid 2, can realize every kind of fire hole independent combustion. So that the combustion of the first fire holes 21 is controlled by controlling the gas admission of the first mixing chamber. The fire hole number is adjusted to adjust the firepower, so that the situation that the energy efficiency is lowered due to the fact that flame is shortened is avoided. Moreover, every time a first mixing chamber channel is closed, namely a group of flames are closed, the user can clearly change the firepower respectively, the user can distinguish the firepower accurately and easily, and the user experience is better.

The 3 first mixing chambers are a number 1 first mixing chamber 14, a number 2 first mixing chamber 15 and a number 3 first mixing chamber 18, respectively.

The 3 kinds of first fire holes are respectively a No. 1 fire hole 211, a No. 2 fire hole 212 and a No. 3 fire hole 29.

Generally, the outlets of the N kinds of first fire holes 21 are located at the same height of the first fire cover 2.

The outlets of the N kinds of first fire holes 21 may be located on the end surface or on one or more ring surfaces of the first fire cover 2, for example, in the embodiment shown in fig. 1 and 2, the outlets of the N kinds of first fire holes are located on the same ring surface of the first fire cover 2, and then, the flames emerge from the outside of the ring surface of the first fire cover 2, and the N kinds of first fire holes 21 are distributed along the circumferential direction of the first fire cover 2 to form the ring flames.

In some embodiments, N kinds of the first fire holes 21 are alternately distributed along the circumferential direction of the first fire cover 2, in other words, each kind of the first fire holes 21 forms one group, each group of the first fire holes 21 includes one or more first fire holes 21, and the N kinds of the first fire holes 21 are sequentially alternately distributed along the circumferential direction of the first fire cover 2. Thus, even if the flame of one or some of the first fire holes 21 is not burned, the uniformity of the fire power distribution can be ensured.

Referring to fig. 1, the shape trend of first hybrid chamber is corresponding with the distribution of first fire hole 21, and N first hybrid chambers are established by outer to interior cover in proper order, and the top of first hybrid chamber is uncovered, and first fire lid 2 covers at furnace end 1 top to shield each first hybrid chamber, the first fire hole of first fire lid 2 and the first hybrid chamber that corresponds to the intercommunication, guaranteed the homogeneity of gas to every first fire hole 21 supply promptly, reduced the processing degree of difficulty of first fire hole 21 on first fire lid 2 again. Typically, the N first mixing chambers are arranged coaxially.

Specifically, the furnace end 1 is provided with M annular baffles which are sequentially sleeved from outside to inside, wherein M is N + 1; n first mixing chambers are N annular chambers with top openings formed by enclosing M annular baffles. In the example structures presented in fig. 3, 4, 9, M is 4. The 4 annular baffles are respectively a first annular baffle 12, a second annular baffle 13, a third annular baffle 17 and a fourth annular baffle 16.

In some embodiments, referring to fig. 1, 3, 4, 5, both the first annular baffle 12 and the second annular baffle 13 extend axially, the first annular baffle 12 and the second annular baffle 13 are concentrically arranged, the end faces of the first annular baffle 12 and the second annular baffle 13 are flush, the second annular baffle 13 is located inside the first annular baffle 12, and a number 1 first mixing chamber 14 is formed between the first annular baffle 12 and the second annular baffle 13. The first fire cover 2 is provided with a first step 22, the first step 22 is attached to the end faces of the first annular baffle plate 12 and the second annular baffle plate 13, a radial sealing retainer ring 24 which is embedded into the No. 1 first mixing chamber 14 and attached to the radial face of the first annular baffle plate 12 is arranged on the first step 22, and the radial sealing retainer ring 24 is used for limiting and sealing. No. 1 fire hole 211 adds a vertical hole passageway by an inclined hole passageway and constitutes, the entry of No. 1 fire hole 211 is located first step 22 and is linked together with No. 1 first hybrid chamber 14, first fire lid 2 shields No. 1 first hybrid chamber 14, make the gas that gets into No. 1 first hybrid chamber 14 can be discharged by No. 1 fire hole 211 and ignite, the flame of No. 1 fire hole 211 can be unified through the gas break-make realization control of No. 1 first hybrid chamber 14, with the size of adjusting the firepower through adjusting fire hole quantity.

Further, referring to fig. 1, 3, 4 and 6, a third annular baffle 17 extends along the axial direction, the third annular baffle 17 is positioned inside the second annular baffle 13, the second annular baffle 13 and the third annular baffle 17 are concentrically arranged, the third annular baffle 17 is higher than the second annular baffle 13, and a No. 2 first mixing chamber 15 is formed between the second annular baffle 13 and the third annular baffle 17. First fire lid 2 has interior anchor ring 23, is equipped with second step 25 on the anchor ring 23, and the terminal surface laminating of second step 25 and third ring baffle 17, and 2 # fire hole 212 is an independent inclined hole passageway and constitutes, and the entry of 2 # fire hole 212 is located interior anchor ring 23 and is linked together with 2 # first hybrid chamber 15. First fire lid 2 shields No. 2 first hybrid chamber 15, makes the gas that gets into No. 2 first hybrid chamber 15 can be discharged by No. 2 fire holes 212 and ignite, and the flame of No. 2 fire holes 212 can be unified and realize control through the gas break-make of No. 2 first hybrid chamber 15 to adjust the size of firepower through adjusting fire hole quantity.

Further, referring to fig. 1, 3, 4, and 7, the fourth annular baffle 16 extends axially, the fourth annular baffle 16 is located inside the third annular baffle 17, the third annular baffle 17 and the fourth annular baffle 16 are concentrically arranged, the fourth annular baffle 16 is higher than the third annular baffle 17, a No. 3 first mixing chamber 18 is formed between the third annular baffle 17 and the fourth annular baffle 16, and the third step 26 may be integrally formed with the first fire cover 2 or may be a detachable split fire cover. The third step 26 is attached to the end face of the fourth annular baffle 16, and the inlet of the No. 3 fire hole 29 is located on the inner annular surface 23 and communicated with the No. 3 first mixing chamber 18. First fire lid 2 shields No. 3 first hybrid chamber 18, makes the gas that gets into No. 3 first hybrid chamber 18 can be discharged by No. 3 fire hole 29 and ignite, and the flame of No. 3 fire hole 29 can be unified through the gas break-make realization control of No. 3 first hybrid chamber 18 to adjust the size of firepower through adjusting fire hole quantity.

In the above embodiment, only one burner with three first fire holes, three first mixing cavities and three first injection pipes is provided, and it can be understood that N may be 4 or 5 or more as required, so as to realize more-level and finer fire control of the burner. Moreover, the annular baffle plate can be integrally formed with the burner 1, or can be connected with the burner 1 by riveting or other processes for processing convenience.

In the above embodiment, be the annular baffle of echelonment distribution for first fire hole is more convenient in seting up of first fire lid 2, reduces the processing degree of difficulty of first fire hole on first fire lid 2. Moreover, the first fire cover 2 is more convenient to assemble and disassemble on the furnace end.

Referring to fig. 1, 2 and 6, an annular groove 27 is arranged below the first fire holes on the first fire cover 2, second fire holes 28 are formed in the annular groove 27, the number of the second fire holes 28 is the sum of the number of the various first fire holes, and the second fire holes 28 are used as flame stabilizing holes of the burner. The inlet of the second fire hole 28 is positioned at the first step 22 and communicated with the No. 1 first mixing cavity 14, and the gas supply of the second fire hole 28 is realized.

The first mixing cavity is used for forming an outer annular fire, in some embodiments, referring to fig. 1 and 4, a second mixing cavity 19 and a second injection pipe 110 communicated with the second mixing cavity 19 are arranged in the center of the furnace end 1, the second mixing cavity 19 is annular, the second mixing cavity 19 is used for forming an inner annular fire, and the top of the second mixing cavity 19 is open. The second mixing chamber 19 is spaced inside the innermost first mixing chamber, i.e. there is a cavity between the second mixing chamber 19 and the first mixing chamber No. 3 18.

Still include second fire lid 3, second fire lid 3 covers at 1 top of furnace end to shield each second mixing chamber 19, be equipped with the third fire hole 31 that is linked together with second mixing chamber 19 on the second fire lid 3, the burning control of third fire hole 31 is decided by the gas supply of second mixing chamber 19, because second mixing chamber 19 has independent second with first mixing chamber and draws and penetrate pipe 110, thereby can the independent control interior volume of a fire size.

The axis of the second injection pipe 110 is a transverse straight line segment, and the outlet of the second injection pipe 110 is positioned between two of the first injection pipes 4.

Referring to fig. 4, the second fire cover 3 is provided with an anti-dry heating probe mounting hole 32, and the anti-dry heating probe mounting hole 32 is located at the center of the second fire cover 3 and can be used for mounting an anti-dry heating probe. An ignition needle thermocouple mounting hole 111 is formed in the furnace end 1 between the first mixing cavity and the second mixing cavity 19 and used for mounting an ignition needle thermocouple.

In the above embodiments, each fire hole may be a circular hole, or may be a square hole.

Referring to fig. 2, the first injection pipe 4 is located at the bottom of the furnace end 1, and the second injection pipe 110 is located at the bottom of the furnace end 1, so that the burner is more convenient to mount, and the injection pipe is connected with a gas pipeline.

In some embodiments, referring to fig. 8, the axes of the first straight cylinder section 41, the constricted section 42 and the second straight cylinder section 43 are collinear, and the length ratio of the constricted section 42 and the second straight cylinder section 43 is 1-2, such as but not limited to 1.5. The axis of the diffuser section 44 is an arc concentric with the first mixing chamber, the diameter of the arc being half the sum of the diameters of the first and third annular baffles, and the arc having a radian in the range of pi/3 to pi, such as but not limited to pi/2.

Referring to fig. 4, the end of the first injection pipe 4 is provided with a rising inclined surface 45 for introducing the gas and the air into the first mixing chamber and improving the mixing effect of the gas and the air, wherein the inclined surface 45 has an inclination angle of 30 ° to 70 °, such as but not limited to 50 °.

An embodiment of the utility model provides a gas stove, including the combustor of above arbitrary embodiment. The combustor has the structural characteristics, and the description is omitted.

In the description herein, references to the description of the term "example," "an embodiment," or "some embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Of course, the invention is not limited to the above embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the invention, and such equivalent modifications or substitutions are included in the scope defined by the claims of the present application.

Claims (10)

1. A burner, comprising:

the burner (1) is provided with N first mixing cavities and N first injection pipes (4) which are communicated with the N first mixing cavities in a one-to-one correspondence mode, the N first injection pipes (4) are provided with curved injection paths, the N first injection pipes are circumferentially arranged below the N first mixing cavities, and N is a natural number larger than 2;

first fire lid (2), with furnace end (1) is connected, first fire lid (2) are equipped with N kinds of first fire hole (21), every first fire hole (21) correspond respectively and communicate one first hybrid chamber.

2. The burner according to claim 1, wherein the N first mixing chambers are N annular chambers sequentially sleeved from outside to inside, and the N first ejector pipes (4) are arranged in an area covered by the lower ends of the N first mixing chambers.

3. Burner according to claim 2, characterized by further comprising a second flame cover (3); still be equipped with second mixing chamber (19) on furnace end (1) and draw with the second that second mixing chamber (19) communicate and penetrate pipe (110), second mixing chamber (19) are located the inboard of the first mixing chamber of the most inboard at intervals, the axis that the pipe (110) were drawn to the second draws is horizontal straightway, the second draws the export that penetrates pipe (110) to be located wherein two first draw and penetrate between pipe (4).

4. The burner according to claim 2, wherein the burner (1) is provided with M annular baffles which are sequentially sleeved from outside to inside, wherein M is N + 1; n first mixing chambers are N annular chambers with top openings formed by enclosing M annular baffles.

5. Burner according to claim 1, characterized in that said first ejector tube (4) comprises, in the direction of the gas flow, a first cylindrical section (41), a convergent section (42) and a divergent section (44), said divergent section (44) being curved.

6. A burner according to claim 5, characterized in that a second straight section (43) is also provided between said convergent section (42) and said divergent section (44).

7. Burner according to claim 1, characterized in that the end of the first ejector tube (4) is provided with a rising ramp (45), the first ejector tube (4) forming an ejector outlet (46) on the bottom of the first mixing chamber.

8. Burner according to claim 1, characterized in that the outlets of the N first fire holes (21) are located at the same height of the first fire cover (2).

9. A burner according to claim 8, characterized in that N kinds of said first fire holes (21) are alternately spaced along the circumferential direction of the outer side surface of said first fire cover (2).

10. A gas range comprising the burner as claimed in any one of claims 1 to 9.

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