CN119713269B - Burner assembly and stove - Google Patents

Abstract

This invention provides a burner assembly and a cooktop. The burner assembly includes a first burner and a second burner. The first burner is connected to the bottom shell of the cooktop via a connecting mechanism, allowing it to be positioned in a first or second position. The first burner includes a first ejector portion forming a first ejector cavity. The second burner is connected to the bottom shell at a second position. The side of the second burner has an air passage, and the second burner includes a first mixing portion that is annular and positioned at the top of the air passage. When the first burner is positioned in the second position of the bottom shell, the first ejector portion can pass through the air passage, and at least a portion of it is positioned at the center of the first mixing portion. The burner assembly of this invention allows the burner to be positioned in different locations, some of which can be combined with other burners to achieve optimal power configuration, adapting to various usage scenarios and meeting the requirements of uniform heat cooking in Western cuisine and the need for high-power stir-frying in Chinese cuisine.

Description

Burner assembly and stove

Technical Field

The invention relates to the technical field of kitchen appliances, in particular to a burner assembly and a kitchen range.

Background

Along with the continuous fusion and development of the eastern and western diet modes, the requirements of people on the power (firepower) regulation range of the gas cooker are wider and wider, the requirements on the firepower are uniform for western-style meals, and the requirements on small fire concentration and strong fire stir-frying for Chinese-style meals are met.

However, most burners of the prior art have a double injection pipe structure, namely, gas and air are respectively mixed through two injection pipes and respectively introduced into an outer ring gas channel and an inner ring gas channel (or a central gas channel), and outer ring flames and inner ring flames (or central flames) are generated by ignition. In addition, there is also a three-injection pipe and a single-injection pipe structure. The kitchen range is usually formed by two or three burners with the same injection pipe structure, so that the firepower of a single kitchen range is difficult to meet the cooking requirement of western-style food and the quick-frying requirement of Chinese food.

Disclosure of Invention

The present invention is directed to solving at least one of the problems discussed above and/or other problems in the prior art.

In order to achieve the purpose of the invention, the invention adopts the following technical scheme:

According to one aspect of the present invention, there is provided a burner assembly for use with a cooktop including a bottom shell having a first position and a second position, the burner assembly including a first burner and a second burner. The first burner is connected to the bottom shell through a connecting mechanism so as to be arranged at the first position or the second position, the first burner comprises a first injection part which surrounds and forms a first injection cavity, the second burner is connected to the second position of the bottom shell, the side part of the second burner is provided with an air channel, the second burner comprises a first air mixing part which is annular and is arranged at the top of the air channel, and when the first burner is arranged at the second position of the bottom shell, the first injection part can penetrate through the air channel and at least one part of the first injection part is arranged at the central position of the first air mixing part.

According to an embodiment of the present invention, the air passage extends at an angle of 90 ° or more in the circumferential direction along the first air mixing portion.

According to an embodiment of the present invention, the first burner further includes a first base formed with a base passage having an air outlet, and a nozzle connected to the air outlet, and an inlet of the first ejection chamber is directed toward the nozzle and has a gap with the nozzle, the gap being configured to primary air-supplement the fuel gas entering the first ejection chamber from the base passage.

According to one embodiment of the invention, the base channel comprises a first section, a second section and a third section which are communicated in sequence, wherein the first section extends along a first direction and is provided with an air inlet, the second section extends along a second direction, the third section extends along the first direction and is provided with an air outlet, the first direction is perpendicular to the second direction, and the nozzle is arranged at the air outlet of the third section.

According to one embodiment of the invention, the first burner further comprises a base shell connected to the periphery of the top of the first base, a base through hole is formed in the base shell corresponding to the nozzle, the area of the base through hole is larger than that of an inlet of the first injection cavity, and the first injection part is connected to the base shell through a rotating mechanism.

According to one embodiment of the invention, the rotating mechanism comprises a first connecting lug, a first pin shaft and a connecting piece, wherein the first connecting lug is connected to the base shell and is provided with a first pin hole, the extending direction of the first pin hole is parallel to the tangential direction passing through the nozzle along the base shell, the connecting piece is connected to the first injection part and is provided with a second pin hole, and the first pin shaft penetrates through the first pin hole and the second pin hole so as to rotationally connect the first injection part to the base shell.

According to one embodiment of the present invention, the connecting piece includes a first connecting plate and a second connecting plate, the second pin hole is disposed at one end of the first connecting plate, the other end of the first connecting plate is connected to the second connecting plate, and the second connecting plate is disposed parallel to the extending direction of the first pin hole and is connected to the first injection portion.

According to one embodiment of the invention, the rotating mechanism further comprises a handle capable of controlling the first injection part to rotate along a first direction, wherein the handle is arranged parallel to the extending direction of the first injection part and is connected to the joint of the first connecting plate and the second connecting plate.

According to an embodiment of the present invention, a third connecting plate extending along an axial direction of the bottom of the first base is provided, and is connected to the connecting mechanism through the third connecting plate.

According to an embodiment of the present invention, the connection mechanism includes a driving portion and a telescopic portion, the driving portion is connected to the bottom shell, one end of the telescopic portion is connected to an output end of the driving portion, and the other end of the telescopic portion is connected to a third connection plate of the first burner.

According to an embodiment of the present invention, the telescopic portion includes a screw, a connection block, and a connection rod, one end of the screw is connected to an output end of the driving portion, the screw passes through the connection block and is in threaded connection with the connection block, the connection block is fixed to one end of the connection rod, and the other end of the connection rod is connected to the third connection plate.

According to one embodiment of the invention, the telescopic part further comprises a telescopic shell and a supporting block, the telescopic shell is arranged on the periphery of the screw rod in a surrounding mode, the telescopic shell is in abutting connection with the peripheral surface of the connecting block, and one end, far away from the connecting rod, of the screw rod is supported at the other end of the shell through the supporting block.

According to one embodiment of the invention, the telescopic part further comprises a first clamping spring and a second clamping spring which are respectively arranged at two sides of the supporting block along the axial direction of the supporting block, and the first clamping spring and the second clamping spring respectively extend outwards from the supporting block to be embedded into the inner side wall of the telescopic shell.

According to an embodiment of the present invention, the telescopic portion further includes a sealing member disposed at an end of the telescopic housing away from the driving portion, and an inner ring surface of the sealing member abuts against the connecting rod.

According to an embodiment of the present invention, the driving part includes a first motor, a worm connected to an output shaft of the first motor, and a worm wheel engaged with the worm, the first motor is fixed to the bottom case, the worm wheel is coaxially disposed with the screw, an extending direction of the worm is perpendicular to an extending direction of the screw, and the worm wheel are configured to convert a driving direction of the first motor into a rotating direction of the screw.

According to one embodiment of the invention, a pin groove extending along the radial direction of the worm wheel is formed in the inner periphery of the worm wheel, a third pin hole is formed in one end, far away from the connecting rod, of the screw rod, and the worm wheel and the screw rod can be fixed in the axial direction through the second pin shaft arranged in the pin groove and the third pin hole.

According to one embodiment of the invention, the driving part further comprises a third clamp spring, one side wall of the third clamp spring is abutted against the worm wheel, the third clamp spring extends inwards from the worm wheel to be embedded into the screw rod, and a shaft shoulder for the worm wheel to be abutted against is formed on the peripheral wall of the screw rod.

According to an embodiment of the present invention, the second burner further includes a second air mixing portion and a second injection portion, wherein the second air mixing portion is in a shape of a "C" and is coaxially and overlapped with and communicated with the first air mixing portion, so as to form the air passage at a position between two ends of the second air mixing portion corresponding to the circumferential direction thereof, and the second injection portion is communicated with the second air mixing portion.

According to an embodiment of the present invention, the first air mixing portion includes a first outer wall, a first inner wall, and a first bottom wall disposed opposite to each other and corresponding to a top portion of the air channel, where the first bottom wall is connected between the first outer wall and the first inner wall, so as to enclose a first annular air mixing chamber, and the top portion and the bottom portion of the first air mixing chamber are respectively provided with the first opening and the second opening.

According to an embodiment of the present invention, the second air mixing portion includes a second bottom wall, a second outer wall, a second inner wall, a first side wall and a second side wall, which are respectively connected to the second bottom wall, so as to enclose a second air mixing chamber with a third opening at the top, where the second outer wall is connected to the first outer wall, the second inner wall is connected to the first inner wall, the third opening is communicated with the second opening, and the second bottom wall is provided with a fourth opening.

According to one embodiment of the invention, the connection part of the second outer wall and the first outer wall is provided with guide plates extending inwards along the circumferential direction of the second outer wall and the first outer wall, gaps are formed between the guide plates and the first side wall, the second side wall and the second inner wall respectively, and the guide plates are provided with air guide holes arranged at intervals along the circumferential direction of the guide plates.

According to one embodiment of the invention, the second injection part is surrounded to form a second injection cavity, the second injection cavity comprises a contraction section, a throat section, a primary diffusion section and a secondary diffusion section which are distributed along the gas flow direction, one end of the contraction section, which is far away from the throat section, is connected with a nozzle mounting plate, and the secondary diffusion section is communicated with the second gas mixing part.

According to another aspect of the present invention, a cooktop is provided. The cooktop includes the burner assembly described previously and a panel. The panel is connected with the bottom shell to enclose and form a kitchen range cavity.

One embodiment of the present invention has the following advantages or benefits:

the burner assembly can set the first burner at different positions, can be combined with the second burner at the second position, and can be independently used when being set at the first position, so that the optimal power configuration is realized, the burner assembly is suitable for various different use occasions, and the requirements of western-style uniform firepower cooking and high-power rapid-fire stir-frying of Chinese food are met.

Drawings

The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

FIG. 1 illustrates a perspective view of a first burner of a burner assembly in a first position in accordance with an exemplary embodiment of the present invention.

Fig. 2 shows a perspective view of the first burner of the hob shown in fig. 1 in a second position.

FIG. 3 illustrates an exploded view of a first burner of an exemplary embodiment of the present invention.

Fig. 4 shows an exploded view of the first burner shown in fig. 3.

Fig. 5 shows a perspective view of the connection mechanism and the first burner of an exemplary embodiment of the present invention.

Fig. 6 shows a top view of the connection mechanism shown in fig. 5.

Fig. 7 shows a cross-sectional view of the connection mechanism shown in fig. 6 along line A-A.

Fig. 8 shows a cross-sectional view of the connection mechanism shown in fig. 6 along line B-B.

Fig. 9 shows a perspective view of a second burner according to an exemplary embodiment of the present invention.

Fig. 10 shows a top view of the second burner shown in fig. 9.

FIG. 11 shows a cross-sectional view of the second burner shown in FIG. 10 along line C-C.

FIG. 12 shows a cross-sectional view of the second burner shown in FIG. 10 along line D-D.

FIG. 13 shows a cross-sectional view of the second burner shown in FIG. 10 along line E-E.

Fig. 14 shows a schematic diagram of the cooperation of the first burner and the second burner according to an exemplary embodiment of the present invention.

Wherein reference numerals are as follows:

1. A bottom case; 2, a first burner; 21, a first injection part; 211, first injection chamber 212, first seat 221, seat passage, 2211, air outlet 2212, first section 2213, second section 2214, third section 222, third connection plate, 2221, connection hole 23, nozzle 24, seat housing, 241, seat through hole 25, rotation mechanism, 251, first connection lug, 2511, first pin hole 252, first pin shaft 253, connection member, 2531, second pin hole 2532, first connection plate 2533, second connection plate 254, handle 26, third connection leg 27, decoration cover 3, connection mechanism, 31, driving part 311, first motor 312, transmission assembly 3121, worm gear 3122, worm gear 3123, third clamp spring 32, telescoping part, 321, screw rod, 3211, third pin hole 322, connection block 323, connection rod 324, housing, 41, fixed pin 325, support block 326, second pin shaft 320, second pin shaft 253, connection member, 2531, second pin hole 2532, first connection plate, 2533, second connection plate, second pin hole 320, second pin shaft 254, second pin hole 42, third connection plate 320, second pin hole 320, first connection plate 320, second pin hole 320, second pin hole 320, third connection plate 320, third connection member, 31, driving part 311, first pin hole 311, first motor 312, second pin hole 312, third pin hole, third pin, third pin, pin, pin holes, a pin holes, a pin holes, a pin holes, a pins, a, the second fixed leg 442, the second injection cavity, 4421, the contraction section, 4422, the throat section, 4423, the primary diffusion section, 4424, the secondary diffusion section, 45, the fire cover, 451, the fire hole, 452, the outer wall of the fire cover, 453, the top wall of the fire cover, 454, the inner wall of the fire cover, 455, the inclined wall of the fire cover, 456, the ignition slot, 46, the ignition needle, 47, the nozzle mounting plate, 5 and the panel.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof will be omitted.

The terms "a," "an," "the," "said" are used to indicate the presence of one or more elements/components/etc., the terms "comprising" and "having" are intended to mean that there may be additional elements/components/etc. in addition to the listed elements/components/etc.

Fig. 1 and 2 show a hob according to an embodiment of the present invention, comprising a bottom shell 1, a first burner 2 and a second burner 4, the bottom shell 1 having a first position and a second position. The first burner 2 includes a first injection portion 21 and is movably connected to the bottom case 1 by a connection mechanism 3 so that the first injection portion 21 can move between a first position and a second position of the bottom case 1. The second burner 4 is fixed to the second position of the bottom case 1 by bolts and has a ring-shaped first air mixing part 41 formed at the top thereof, and the side of the second burner 4 has an air passage 43. When the first burner 2 is placed at the second position of the bottom case 1, the first injection portion 21 may pass through the air passage 43 and be placed at the center of the first injection portion 21. The first injection portion 21 may be used alone when the first burner 2 is placed in the first position of the bottom case 1. The second burner 4 can also supplement the flame at the first injection portion 21 with secondary air through the air passage 43, increasing the heat load of the second burner 4.

Fig. 3 and 4 show a first burner 2 according to an embodiment of the invention. As shown in fig. 3 and 4, the first burner 2 according to this embodiment may include a first injection portion 21, a first base 22, and a nozzle 23. The first injection portion 21 extends along the horizontal direction and encloses and establishes and form first injection cavity 211, and the top of the one end of first injection portion 21 corresponding to first injection cavity 211 is provided with a plurality of fire holes 212 that extend along vertical direction, and the lateral wall of the one end that first injection portion 21 kept away from fire holes 212 is provided with the import for the axial of this import extends along the horizontal direction. The first base 22 is of a solid structure, and a base passage 221 for delivering fuel gas to the first injection portion 21 is formed therein, and the base passage 221 includes an air outlet 2211 provided corresponding to the inlet. The nozzle 23 is disposed at the air outlet 2211 and connected to the first base 22, and the nozzle 23 faces the inlet, so that the fuel gas in the base channel 221 can be sprayed to the inlet of the first injection portion 21. And because of the gap between the nozzle 23 and the inlet, the negative pressure generated when the nozzle 23 injects the fuel gas toward the inlet can suck the air at the gap into the first ejection chamber 211 together with the fuel gas, so that the gap is configured to primary air supplement the fuel gas entering the first ejection chamber 211 from the base channel 221. The air and the fuel gas are fully mixed when flowing in the first injection cavity 211, and then reach the fire hole 212 to be ignited. In this way, a soft air tube may be connected to the air inlet end of the base channel 221 of the first base 22, thereby facilitating movement of the first burner 2 between the first and second positions.

According to one exemplary embodiment of the base passage 221, as shown in fig. 4, the base passage 221 may include a first segment 2212, a second segment 2213, and a third segment 2214, which are sequentially communicated, the first segment 2212 extending in a first direction and having the air inlet 213, the second segment 2213 extending in a second direction (a vertical direction as shown in fig. 4), and the third segment 2214 extending in the first direction and provided with the air outlet 2211 of the base passage 221, thereby facilitating connection of the air pipe to the air inlet 213 of the first segment 2212. It can be understood that, the first direction and the second direction refer to not only the horizontal direction and the vertical direction, in order to conveniently connect the air pipe to the air inlet 213 of the first section 2212, the inlet of the first injection portion 21 corresponds to the air outlet 2211 of the third section 2214, and the first direction may be set along an inclined direction forming a certain included angle with the horizontal direction, and meanwhile, the first direction and the second direction may be set vertically. In other embodiments, the first direction and the second direction may still be disposed in a non-perpendicular state, so long as the fuel gas can flow smoothly and rapidly in the base channel 221.

According to a further exemplary embodiment of the first burner 2, as shown in fig. 3 and 4, the first burner 2 further includes a base housing 24 coupled to the top periphery of the first base 22, the base housing 24 is provided with a base through hole 241 corresponding to the nozzle 23, and the area of the base through hole 241 is larger than the area of the inlet, so that more air can be collected at the inlet to be sucked into the first injection part 21, and a sufficient amount of air required for combustion can be provided for the gas entering the first injection part 21. The first injection portion 21 is connected to the base housing 24 through the rotating mechanism 25, so that the base housing 24 can provide a mounting point for the first injection portion 21 when covering the internal structure of the first base 22.

According to an exemplary embodiment of the rotation mechanism 25, as shown in fig. 3, the rotation mechanism 25 may include a first connection lug 251, a first pin 252, and a connection member 253, the first connection lug 251 being connected to the base housing 24, the connection member 253 being connected to the first injection portion 21, the first connection lug 251 and the connection member 253 being rotatably connected by the first pin 252. Specifically, the base housing 24 is a cylinder with its axis in the vertical direction, and the first connection lug 251 is provided with a first pin hole 2511, and the extending direction of the first pin hole 2511 is parallel to the tangential direction passing through the nozzle 23 along the base housing 24. The end of the connecting piece 253, which is far away from the first injection part 21, is provided with a second pin hole 2531, and the first connecting lug 251 and the connecting piece 253 can be rotationally connected by penetrating through the first pin hole 2511 and the second pin hole 2531 through the first pin shaft 252, so that the first injection part 21 can rotate around the axis of the base shell 24 passing through the tangential direction of the nozzle 23. Therefore, when the kitchen range is cleaned or maintained, the first injection part 21 is lifted up to clean the bottom shell 1 at the corresponding position of the first injection part 21. In other embodiments, the extending direction of the first pin hole 2511 may be parallel to the axial direction of the base housing 24, and the second pin hole 2531 on the connecting piece 253 is coaxially disposed with the first pin hole 2511, and the connecting piece 253 is connected to the upper end and the lower end of the first injection portion 21, so that the first injection portion 21 may rotate in the horizontal direction.

According to one exemplary embodiment of the connector 253, as shown in fig. 3, the connector 253 may include a first connection plate 2532 and a second connection plate 2533 connected to the first connection plate 2532. The first connecting plate 2532 and the second connecting plate 2533 are vertically connected, the second pin hole 2531 is arranged at one end portion, far away from the second connecting plate 2533, of the first connecting plate 2532, and the second connecting plate 2533 is parallel to the extending direction of the first pin hole 2511 and is connected to the first injection portion 21. Further, in order to increase the connection strength between the second connection plate 2533 and the first injection portion 21, the first injection portion 21 is further integrally formed with a connection plate perpendicular to the extending direction thereof, the connection plate and the second connection plate 2533 have an overlapping portion, and corresponding hole sites are provided at corresponding positions of the overlapping portion and are fixed by bolts. Preferably, the two first connection plates 2532 are respectively connected to two sides of the second connection plate 2533, and the second pin holes 2531 are respectively disposed at one ends of the two first connection plates 2532 away from the second connection plate 2533.

Still further, the rotating mechanism 25 is further provided with a handle 254, and the handle 254 is disposed parallel to the extending direction of the first injection portion 21 and is connected to the connection portion of the first connecting plate 2532 and the second connecting plate 2533, so that the first connecting plate 2532, the second connecting plate 2533 and the handle 254 form an approximately "F" shape structure. When the handle 254 is held, the first ejector 21 is controlled to rotate in a first direction (vertical direction shown in fig. 3).

In the above-described embodiment, in order to be able to easily connect the first burner 2 to the connection mechanism 3 so as to set the first burner 2 at different operating positions, as shown in fig. 3 and 4, the bottom of the first base 22 is provided with the third connection plate 222 extending in the circumferential direction thereof, and the bottom of the third connection plate 222 is provided with the connection through hole 2221. The first burner 2 can be connected to the corresponding connection mechanism 3 by bolts passing through the connection through holes 2221.

In the above embodiment, the first burner 2 may further include a plurality of third fixing legs 26 which are provided in a ring shape at equal intervals on the bottom of the first base 22, and the first burner 2 may be connected to a corresponding guide mechanism to support and guide the moving path by the third fixing legs 26 as shown in fig. 5.

In addition, the first burner 2 may further include a decorative cover 27 as shown in fig. 3, where the decorative cover 27 covers the top of the base housing 24, and extends from the top of the base housing 24 along the direction of the first injection portion 21, so as to cover the rotating mechanism 25, thereby playing an aesthetic and dustproof role.

Fig. 6 to 8 show a connection mechanism 3 according to an embodiment of the present invention, as shown in fig. 1 and 2, the connection mechanism 3 according to the embodiment may include a driving part 31 and a telescopic part 32. The driving portion 31 is connected to the bottom case 1, one end of the expansion portion 32 is connected to an output end of the driving portion 31, and the other end of the expansion portion 32 is connected to the first burner 2. The telescopic part 32 is driven to stretch by the power of the driving part 31, so that the first burner 2 is driven to linearly move in a cavity formed by surrounding the bottom shell 1, and the first burner 2 is arranged at a first position and a second position. It will be appreciated that the first burner 2 may have a smaller or larger thermal efficiency, as shown in figures 1 and 2, and when disposed in either the first or second position, can be used alone with a smaller thermal efficiency, or in combination with a second burner 4 of a different thermal efficiency to form a combined burner of greater thermal efficiency.

According to an exemplary embodiment of the telescoping portion 32, as shown in fig. 7, the telescoping portion 32 includes a lead screw 321, a connection block 322, and a connection rod 323. One end of the screw rod 321 (the left end of the screw rod 321 shown in fig. 7) is connected to the output end of the driving part 31, the screw rod 321 is in threaded connection with the connecting block 322 when passing through the connecting block 322, and the connecting block 322 is driven to move along the axial direction of the screw rod 321 by rotating the screw rod 321 and keeping the same stationary in the axial direction. One end of the connecting rod 323 (the left end of the connecting rod 323 shown in fig. 7) is fixed with the connecting block 322, and the other end of the connecting rod 323 is connected to the first burner 2, so that the axial directions of the connecting rod 323 and the screw rod 321 can be coaxially or parallelly arranged, and the connecting rod 323 is driven to move left and right through the movement of the connecting block 322, so that the first burner 2 can be arranged at a first position on the left side and a second position on the right side. It will be appreciated that the first burner 2 is disposed in the first position when the connection block 322 is located at the left end of the screw 321, and the first burner 2 is disposed in the second position when the connection block 322 is located at the right end of the screw 321. Specifically, the connection block 322 has a structure in which the diameter of the left end is large and the diameter of the right end is small as shown in fig. 7, the right end of the connection block 322 is provided with external threads, and the left end of the connection rod 323 is provided with internal threads, so that the connection rod 323 and the connection block 322 are fixed through threaded connection.

Further, the telescopic portion 32 may further include a telescopic housing 324, a supporting block 325 and a sealing member 328, with continued reference to fig. 7, the telescopic housing 324 is enclosed on the outer periphery of the screw rod 321, and the inner peripheral wall of the telescopic housing 324 abuts against the outer peripheral surface of the left portion of the connecting block 322, so that smooth relative movement of dust or impurities falling into the junction between the screw rod 321 and the connecting block 322 can be ensured. The seal 328 is connected to the telescopic housing 324 by bolts provided along the axial direction thereof, the inner circumferential surface of the seal 328 abuts against the outer circumferential surface of the connecting rod 323, and the left end of the connecting rod 323 is supported on the telescopic housing 324 by the seal 328. The left end of the screw 321 is supported by the left end of the telescopic housing 324 via a support block 325. The bottom of the telescopic housing 324 is provided with two fixing legs 3241 symmetrically disposed in a direction perpendicular to the axial direction of the telescopic housing 324, and each fixing leg 3241 extends in the axial direction of the telescopic housing 324, so that the telescopic portion 32 can be fixed and supported on the bottom chassis 1 by the two fixing legs 3241.

In order to prevent the support block 325 from sliding within the telescopic housing 324, the telescopic portion 32 may further include a first clip 326 and a second clip 327 provided at both sides of the support block 325 in the axial direction thereof (left and right sides of the support block 325 shown in fig. 7), respectively. The first clamp spring 326 abuts against the left end face of the support block 325, and extends radially outward from the left end face to the inner side wall of the embedded telescopic housing 324. The second clamp spring 327 abuts against the right end surface of the support block 325, and extends radially outward from the right end surface to the inner side wall of the embedded telescopic housing 324.

According to an exemplary embodiment of the driving part 31, as shown in fig. 7, the driving part 31 may include a first motor 311 and a driving assembly 312, the first motor 311 is indirectly fixed to the telescopic housing 324 through a bolt directly or through a bolt connection to a bracket, one end of the driving assembly 312 is connected to an output shaft of the first motor 311, and the other end of the driving assembly 312 is connected to the screw 321, so that a driving direction of the first motor 311 (i.e., a rotation direction of the output shaft of the first motor 311) may be converted into a rotation direction of the screw 321, thereby disposing the driving part 31 and the telescopic part 32 in a space defined by the narrower bottom case 1.

According to an exemplary embodiment of the transmission assembly 312, with continued reference to fig. 7, the transmission assembly 312 may include a worm 3121 and a worm gear 3122. The worm 3121 and the output shaft of the first motor 311 are coaxially disposed and connected, the worm wheel 3122 is coaxially disposed and connected with the lead screw 321, the extending direction of the worm 3121 is perpendicular to the extending direction of the lead screw 321, and the output shaft of the first motor 311 is converted into the extending direction of the lead screw 321 in the left and right direction shown in fig. 7 along the extending direction perpendicular to the paper surface shown in fig. 7 by the worm 3121 and the worm wheel 3122, so that the driving part 31 and the telescopic part 32 can be conveniently disposed at the vacant position of the bottom case 1.

In order to stably and effectively connect the worm wheel 3122 and the screw 321, with continued reference to fig. 7, the inner circumference of the worm wheel 3122 is provided with a pin groove (not shown) extending in a radial direction thereof, and one end of the screw 321 remote from the connection rod 323 (the left end of the screw 321 shown in fig. 7) is provided with a third pin hole 3211. The second pin 33 is provided in the pin groove and the third pin hole 3211, so that the worm wheel 3122 and the screw 321 can be fixed in the circumferential directions thereof. The outer peripheral wall of the screw rod 321 is formed with a shoulder for the worm wheel 3122 to abut, and the transmission assembly 312 may further include a third clamp spring 3123, one side wall of the third clamp spring 3123 abuts against the left side wall of the worm wheel 3122, and the third clamp spring 3123 extends inward from the worm wheel 3122 to be embedded in the screw rod 321, so that the worm wheel 3122 and the screw rod 321 are fixed in the axial directions of the two. When the worm 3121 drives the worm wheel 3122 to rotate, the screw 321 can be kept rotating in synchronization with the worm wheel 3122.

In order to prevent the connecting rod 323 from being stable after being extended out of the telescopic housing 324 by a certain length, the connection mechanism 3 may further include a guide portion 34 provided at a side of the connecting rod 323 extending out of the telescopic housing 324 (right side of the connecting rod 323 shown in fig. 7), the guide portion 34 being simultaneously connected to the right end of the connecting rod 323 and the first burner 2 through the connection member 253, so that the extension and retraction of the connecting rod 323 through the guide portion 34 plays a guiding role and a role of supporting the first burner 2. Specifically, as shown in fig. 8, the guide 34 includes a plurality of balls 341, and first, second, and ball support plates 342, 343, 344. The cross section of the first rail 342 is in a "concave" shape with the opening facing the side away from the bottom case 1 (the opening of the first rail 342 shown in fig. 8 faces the top of the bottom case 1). The cross section of the second sliding rail 343 is concave and the opening covers the top of the first sliding rail 342 downwards, so that the two side walls of the second sliding rail 343 can be arranged corresponding to the two side walls of the first sliding rail 342 and have overlapping parts (the side walls of the second sliding rail 343 are arranged on the inner sides of the side walls of the first sliding rail 342 as shown in fig. 8), and the second sliding rail 343 is directly connected to the first burner 2 or indirectly connected to the first burner 2 and the connecting rod 323 through the connecting piece 253. The cross section of the ball support plate 344 is in a "concave" shape and the opening of the ball support plate 344 is disposed in the same direction as the first slide rail 342 (the opening of the ball support plate 344 is toward the top of the bottom chassis 1 as shown in fig. 8), so that the side wall of the ball support plate 344 can be sandwiched between the first slide rail 342 and the second slide rail 343. The side wall of the ball support plate 344 is provided with a plurality of support holes 3441 for receiving the balls 341 so that the plurality of balls 341 are arranged and sandwiched between the first slide rail 342 and the second slide rail 343.

Fig. 9 to 14 show a second burner 4 according to an embodiment of the present invention. As shown in fig. 9 and 10, the second burner 4 according to this embodiment may include a first gas mixing portion 41, a second gas mixing portion 42, a second injection portion 44, and a flame cover 45. The first air mixing part 41 extends in a ring shape in a first plane (a transverse plane or a horizontal plane as shown in fig. 1), and a top of the first air mixing part 41 has a first opening 411. The second air mixing portion 42 also extends in a "C" shape in a first plane (a lateral plane or a horizontal plane as shown in fig. 9), and when the second air mixing portion 42 is disposed coaxially with the first air mixing portion 41 and is overlapped and joined to the bottom of the first air mixing portion 41 and communicates with the first air mixing portion 41, an air passage 43 may be formed in the second air mixing portion 42 at a position corresponding to between both end portions in the circumferential direction thereof. The second injection portion 44 is connected to the second gas mixing portion 42, and a nozzle 23 for communicating with an indoor gas pipeline is connected to an end of the second injection portion 44 away from the second gas mixing portion 42, and a small amount of primary air is supplied to the gas entering the second injection portion 44 through the nozzle 23, so that mixing of the gas and a small amount of air is performed in the second injection portion 44. The annular fire cover 45 may completely cover the top of the first gas mixing portion 41, and a plurality of fire holes 451 may be provided at intervals along the axial direction of the fire cover 45, so that the gas mixture of the first gas mixing portion 41 is ignited when reaching the fire holes 451 through the first openings 411. The air entering the fire hole 451 through the air passage 43 supplements a sufficient amount of secondary air to the mixture, thereby enabling the second burner 4 of the single jet pipe structure to obtain a large heat load.

According to a preferred embodiment of the air passage 43, as shown in fig. 9, the extending angle of the air passage 43 in the circumferential direction along the first air mixing portion 41 is 90 ° or more, so that the air around the second air mixing portion 42 can smoothly enter the inside of the second burner 4 by more than a quarter of the angle of the cross section of the second burner 4 occupied by the inlet of the air passage 43, and further flows to each fire hole 451 on the fire cover 45, particularly the fire hole 451 on the inner side wall of the fire cover 45, to provide sufficient secondary air for the combustion of the mixture gas at the fire hole 451, so that the combustion is more sufficient and the CO emission is lower.

According to an exemplary embodiment of the first air mixing section 41, as shown in fig. 11, the first air mixing section 41 includes a first outer wall 412, a first inner wall 413, and a first bottom wall 414 that are disposed opposite to each other. The first bottom wall 414 is connected between the first outer wall 412 and the first inner wall 413 and is disposed corresponding to the top of the air passage 43, so that a second opening 416 is formed between the first outer wall 412 and the first inner wall 413 at a position where the first bottom wall 414 is not disposed. The top of the first outer wall 412 and the top of the first inner wall 413 are spaced apart from each other by a distance to form a first opening 411 such that a first mixing chamber 415 is formed between the first outer wall 412 and the first inner wall 413.

According to one exemplary embodiment of the second air mixing section 42, as shown in fig. 11 and 12, the second air mixing section 42 includes a second bottom wall 421, a second outer wall 422, a second inner wall 423, a first side wall 424, and a second side wall 425. The second bottom wall 421 is provided at the bottom of the second air mixing portion 42, and is provided with a fourth opening 4211. The second outer wall 422 and the second inner wall 423 are respectively provided with a ring shape with a notch (i.e. are in a shape of a C) and are arranged at intervals, wherein the second outer wall 422 is connected with the first outer wall 412, and the second inner wall 423 is connected with the first inner wall 413. The first side wall 424 and the second side wall 425 are provided at both end portions of the second outer wall 422 in the circumferential direction thereof, respectively, and extend inward to the second inner wall 423 in the radial direction of the second air mixing portion 42, thereby forming the air passage 43 between the first side wall 424 and the second side wall 425. Such that a third opening 426 is formed between the top of the second outer wall 422, the top of the second inner wall 423, the top of the first side wall 424, and the top of the second side wall 425, the third opening 426 and the second opening 416 corresponding and communicating. The second bottom wall 421 is provided with a fourth opening 4211 for communicating with the second injection portion 44. In a further preferred embodiment, the first air mixing part 41 and the second air mixing part 42 are integrally formed into one body by some process, for example, by die casting or integral casting of a metal material.

In the above embodiment, in order to enable the mixture gas entering the second gas mixing portion 42 through the fourth opening 4211 to be uniformly distributed in the circumferential direction of the second gas mixing portion 42, the connection portion between the second outer wall 422 and the first outer wall 412 is provided with the baffle 4221 extending inward along the circumferential direction of the two. As shown in fig. 11 to 13, the two ends of the deflector 4221 in the circumferential direction have a certain gap with the first sidewall 424 and the second sidewall 425, respectively, the outer end of the deflector 4221 is connected to the second outer wall 422, the inner end has a certain gap with the second inner wall 423, and a plurality of air guide holes 42211 are formed in the deflector 4221 at intervals along the circumferential direction. After the mixed gas flows into the second mixed gas cavity 427 from the fourth opening 4211, the mixed gas guided by the guide plate 4221 can uniformly flow into the first mixed gas cavity 415, and further mixed in the first mixed gas cavity 415, so that the pressure of the mixed gas is more uniform, and then the mixed gas flows into each fire hole 451 on the fire cover 45, so that the flame at the fire cover 455 is more uniform. In other embodiments, the baffle 4221 may also be connected to the second inner wall 423 with a gap between the baffle and the second outer wall 422.

In order to support the first air mixing portion 41 and the second air mixing portion 42 on the bottom case 1 of the kitchen range and further keep the balance of the second burner 4 from shaking, as shown in fig. 9, the second bottom wall 421 is circular, and at least one first fixing leg 4212 extending toward one end of the second bottom wall 421 away from the fire cover 45 is provided at intervals at the bottom of the second bottom wall 421. At least one second fastening leg 441 is provided at the bottom of the second injection portion 44, the second fastening leg 441 and the first fastening leg 4212 being configured to cooperate with the support fastening of the second burner 4. For example, the second burner 4 is fixed to the bottom shell 1 of the hob.

According to a further exemplary embodiment of the second air mixing part 42, as shown in fig. 9 to 13, a mounting block 4213 for mounting the ignition needle 46 is provided on the second bottom wall 421 of the second air mixing part 42 corresponding to the inside of the second inner wall 423, at least a part of the fire holes 451 are provided on the inside of the fire cover 45, and at least a part of the fire holes 451 correspond to the needle head portion of the ignition needle 46. In other specific embodiments, the mounting block 4213 may also be disposed on the outside of the second bottom wall 421 corresponding to the second inner wall 423, such that at least a portion of the fire hole 451 may also be disposed on the outside of the fire cover 45 and corresponding to the needle portion of the ignition needle 46.

According to an exemplary embodiment of the second ejector 44, as shown in fig. 13, the second ejector 44 encloses a second ejector cavity 442, and the second ejector cavity 442 may include a constriction 4421, a throat 4422, a primary diffuser 4423, and a secondary diffuser 4424 distributed along the gas flow direction (right-to-left direction in fig. 13). A nozzle mounting plate 47 is provided at the end of the convergent section 4421 remote from the throat section 4422 for mounting the nozzle 23, and a part of air is sucked by negative pressure to form a mixture gas when the gas enters the convergent section 4421 from the indoor gas supply line. The secondary diffuser 4424 is a larger cavity structure than the primary expansion section and communicates with the fourth opening 4211 of the second air mixing section 42. As the initial gas enters the constriction 4421, the cross-sectional area of the constriction 4421 gradually decreases, the gas forming jet creates entrainment flow, and a negative pressure zone occurs due to the gas flow being at a high velocity, thereby absorbing a portion of the air from the nozzle 23 into the constriction 4421 along with the gas to create a mixture. After the mixed gas enters the throat section 4422, the cross-sectional area of the throat section 4422 is kept unchanged along with the flow of the gas, so that the mixed gas can exchange kinetic energy in the throat section 4422, and the velocity field of the mixed gas is gradually and uniformly distributed in the flowing process. Then the mixed gas enters the primary diffusion section 4423, the pressure is increased due to the reduction of the flow velocity, and partial dynamic pressure of the mixed gas is changed into static pressure, so that the pressure of the mixed gas is higher than the pressure of the injection fluid just entering the contraction section 4421, the flow velocity of the mixed gas is reduced, and the gas and the air are uniformly mixed at the moment. After the mixed gas enters the secondary diffusion section 4424, the static pressure is further increased, the flow speed of the mixed gas is further reduced, and the mixed gas is more uniformly mixed at the moment. The design of the primary diffusion section 4423 and the secondary diffusion section 4424 ensures that the fuel gas and the air are mixed more uniformly, and the flow speed of the mixed gas is also greatly reduced. It will be appreciated that the pressure of the fluid acting perpendicularly on the wall is referred to as static pressure and the pressure resulting from the velocity as the mixture flows within the second eductor part 44 of the conduit structure is referred to as dynamic pressure.

Preferably, the second ejector portion 44 is integrally formed with the second gas-mixing portion 42 by processes such as die casting or integral casting of a metallic material. The second injection portion 44 is provided with a second fixing leg 441 corresponding to the throat section 4422, and cooperates with two first fixing legs 4212 provided at an interval on the second bottom wall 421 to form a tripod shape for supporting and fixing the second burner 4.

According to an exemplary embodiment of the fire cover 45, as shown in fig. 11, the fire cover 45 includes a fire cover outer wall 452 connected to the first outer wall 412, respectively, a fire cover top wall 453 connected to the fire cover outer wall 452, a fire cover inner wall 454 connected to the first inner wall 413, and a fire cover inclined wall 455 extending from the fire cover top wall 453 obliquely toward the fire cover inner wall 454, the fire cover inclined wall 455 and the fire cover outer wall 452 are provided with a plurality of fire holes 451, respectively, at intervals along a circumferential direction of the fire cover 45, so that an outer ring flame and an inner ring flame may be formed at an outer circumference of the fire cover 45 and an inner circumference of the fire cover 45, respectively. And a igniting groove 456 corresponding to the ignition needle 46 is provided at the ignition cover top wall 453, the igniting groove 456 extends from the ignition cover inclined wall 455 to the ignition cover outer wall 452, and the mixture at the fire hole 451 on the ignition cover inclined wall 455 or the ignition cover outer wall 452 can be ignited and the mixture at the fire hole 451 on the ignition cover outer wall 452 or the ignition cover inclined wall 455 can be ignited by the igniting groove 456, regardless of whether the needle portion of the ignition needle 46 is provided inside or outside the ignition cover 45.

The invention also provides a kitchen range. Fig. 1 and 2 show partial perspective views of the hob. The hob comprises a connection mechanism 3 as described above, a first burner 2, a second burner 4 and a panel 5. The panel 5 is connected with the bottom shell 1 to form a kitchen range cavity in a surrounding mode. The first burner 2 can be driven by the connecting mechanism 3 to slide between a first position and a second position, so that the first burner 2 can be used alone in the first position, and can form a combined burner together with the second burner 4 in the second position, as shown in fig. 14.

In embodiments of the present invention, the term "plurality" refers to two or more, unless explicitly defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly attached, detachably attached, or integrally attached. The specific meaning of the above terms in the embodiments of the present invention will be understood by those of ordinary skill in the art according to specific circumstances.

In the description of the embodiments of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present invention and to simplify the description, and do not indicate or imply that the devices or units referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the embodiments of the present invention.

In the description of the present specification, the terms "one embodiment," "a preferred embodiment," and the like, 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 embodiments 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 particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present invention and is not intended to limit the embodiment of the present invention, and various modifications and variations can be made to the embodiment of the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims (20)

1. A hob comprising a bottom shell (1) with a first position and a second position, characterized in that said hob further comprises a burner assembly comprising:

A first burner (2), wherein the first burner (2) is slidably connected with the bottom shell (1) through a connecting mechanism (3) so as to be arranged at the first position or the second position, the first burner (2) comprises a first injection part (21) surrounding to form a first injection cavity (211), and

A second burner (4), the second burner (4) is connected to the bottom shell (1) at a second position, an air channel (43) is arranged at the side part of the second burner (4), and the second burner (4) comprises a first air mixing part (41) which is annular and is arranged at the top of the air channel (43);

Wherein, when the first burner (2) is arranged at the second position of the bottom shell (1), the first injection part (21) can pass through the air channel (43) and at least one part of the first injection part is arranged at the central position of the first air mixing part (41);

The extending angle of the air channel (43) along the first air mixing part (41) in the circumferential direction is more than or equal to 90 degrees;

The first burner (2) further comprises a first base (22) and a nozzle (23), wherein the first base (22) is formed with a base channel (221) with an air outlet (2211), the nozzle (23) is connected to the air outlet (2211), the inlet of the first injection cavity (211) faces the nozzle (23) and has a gap with the nozzle (23), and the gap is configured to perform primary air supplementation on fuel gas entering the first injection cavity (211) from the base channel (221);

the second combustor (4) further comprises a second gas mixing part (42) and a second injection part (44), the second gas mixing part (42) is in a C shape and is coaxially and overlapped with the first gas mixing part (41) to be connected and communicated, so that an air channel (43) is formed at a position between two ends of the second gas mixing part (42) corresponding to the circumferential direction, and the second injection part (44) is communicated with the second gas mixing part (42).

2. The cooktop of claim 1, wherein the base channel (221) includes a first section (2212), a second section (2213), and a third section (2214) that are sequentially communicated, the first section (2212) extends along a first direction and has an air inlet (213), the second section (2213) extends along a second direction, the third section (2214) extends along the first direction and has an air outlet (2211), the first direction is perpendicular to the second direction, and the nozzle (23) is disposed at the air outlet (2211) of the third section (2214).

3. The cooking hob according to claim 1, characterized in, that the first burner (2) further comprises a base housing (24) connected to the top periphery of the first base (22), a base through hole (241) is opened at the base housing (24) corresponding to the nozzle (23), the area of the base through hole (241) is larger than the area of the inlet of the first injection cavity (211), the first injection part (21) is connected to the base housing (24) through a rotation mechanism (25).

4. A kitchen range according to claim 3, characterized in that the rotation mechanism (25) comprises a first connection lug (251), a first pin shaft (252) and a connecting piece (253), the first connection lug (251) is connected to the base housing (24) and is provided with a first pin hole (2511), the extending direction of the first pin hole (2511) is parallel to the tangential direction passing through the nozzle (23) along the base housing (24), the connecting piece (253) is connected to the first injection portion (21) and is provided with a second pin hole (2531), and the first pin shaft (252) penetrates through the first pin hole (2511) and the second pin hole (2531) so as to rotationally connect the first injection portion (21) to the base housing (24).

5. The cooking hob according to claim 4, characterized in, that the connection piece (253) comprises a first connection plate (2532) and a second connection plate (2533), the second pin hole (2531) is arranged at one end of the first connection plate (2532), the other end of the first connection plate (2532) is connected to the second connection plate (2533), the second connection plate (2533) is arranged parallel to the extension direction of the first pin hole and is connected to the first injection portion (21).

6. The cooking hob according to claim 5, characterized in, that the rotation mechanism (25) further comprises a handle (254) capable of controlling the rotation of the first injection part (21) in a first direction, the handle (254) being arranged parallel to the extension direction of the first injection part (21) and being connected to the connection of the first connection plate (2532) and the second connection plate (2533).

7. The hob according to claim 1, characterized in, that the bottom of the first base (22) is provided with a third connection plate (222) extending in its axial direction and connected to the connection mechanism (3) by means of the third connection plate (222).

8. The cooking hob according to claim 7, characterized in, that the connection mechanism (3) comprises a driving part (31) and a telescopic part (32), the driving part (31) is connected to the bottom shell (1), one end of the telescopic part (32) is connected to the output end of the driving part (31), and the other end of the telescopic part (32) is connected to a third connection plate (222) of the first burner (2).

9. The cooking range according to claim 8, characterized in that the telescopic part (32) comprises a screw (321), a connecting block (322) and a connecting rod (323), one end of the screw (321) is connected to the output end of the driving part (31), the screw (321) passes through the connecting block (322) and is in threaded connection with the connecting block (322), the connecting block (322) is fixed with one end of the connecting rod (323), and the other end of the connecting rod (323) is connected to the third connecting plate (222).

10. The cooking appliance according to claim 9, wherein the telescopic part (32) further comprises a telescopic housing (324) and a supporting block (325), the telescopic housing (324) is arranged around the periphery of the screw rod (321), the telescopic housing (324) is abutted with the peripheral surface of the connecting block (322), and one end, far away from the connecting rod (323), of the screw rod (321) is supported at the other end of the housing (324) through the supporting block (325).

11. The cooking hob according to claim 10, characterized in that the telescopic part (32) further comprises a first clamping spring (326) and a second clamping spring (327) arranged on both sides of the support block (325) in the axial direction thereof, respectively, the first clamping spring (326) and the second clamping spring (327) extending outwards from the support block (325) to an inner side wall embedded in the telescopic housing (324), respectively.

12. The hob according to claim 10, characterized in, that the telescopic part (32) further comprises a seal (328) arranged at an end of the telescopic housing (324) remote from the driving part, the inner annular surface of the seal (328) being in abutment with the connecting rod (323).

13. The cooking hob according to claim 9, characterized in that the driving part (31) comprises a first motor (311) and a worm (3121) connected to an output shaft of the first motor (311) and a worm wheel (3122) engaging with the worm (3121), the first motor (311) being fixed to the bottom shell (1), the worm wheel (3122) being arranged coaxially with the screw (321), an extension direction of the worm (3121) being perpendicular to an extension direction of the screw (321), the worm (3121) and the worm wheel (3122) being configured to convert a driving direction of the first motor (311) into a rotation direction of the screw (321).

14. The cooking hob according to claim 13, characterized in that the inner circumference of the worm wheel (3122) is provided with a pin groove extending in a radial direction thereof, one end of the screw (321) remote from the connecting rod (323) is provided with a third pin hole (3211), the worm wheel (3122) and the screw (321) can be fixed in an axial direction by a second pin shaft (33) being provided in the pin groove and the third pin hole (3211).

15. The cooking hob according to claim 13, characterized in, that the driving part further comprises a third snap spring (3123), a side wall of the third snap spring (3123) is abutted against the worm wheel (3122), the third snap spring (3123) extends inwards from the worm wheel (3122) to be embedded into the screw (321), and a shoulder for the worm wheel (3122) to be abutted is formed on an outer peripheral wall of the screw (321).

16. The cooking appliance according to claim 1, wherein the first air mixing part (41) comprises a first outer wall (412), a first inner wall (413) and a first bottom wall (414) which are oppositely arranged and are arranged corresponding to the top of the air channel (43), the first bottom wall (414) is connected between the first outer wall (412) and the first inner wall (413) so as to enclose a first annular air mixing cavity (415), and a first opening (411) and a second opening (416) are respectively arranged at the top and the bottom of the first air mixing cavity (415).

17. The cooking hob according to claim 16, characterized in, that the second air mixing portion (42) comprises a second bottom wall (421), a second outer wall (422), a second inner wall (423), a first side wall (424) and a second side wall (425) connected to the second bottom wall (421) respectively, so as to enclose a second air mixing cavity (427) forming a third opening (426) at the top, the second outer wall (422) being connected with the first outer wall (412), the second inner wall (423) being connected with the first inner wall (413), the third opening (426) being in communication with the second opening (416), the second bottom wall (421) being provided with a fourth opening (4211).

18. The cooking appliance according to claim 17, wherein the connection between the second outer wall (422) and the first outer wall (412) is provided with an inwardly extending baffle (4221) along the circumferential direction of the two, gaps are respectively formed between the baffle (4221) and the first side wall (424), the second side wall (425) and the second inner wall (423), and air guide holes (42211) are formed in the baffle (4221) at intervals along the circumferential direction of the baffle.

19. The cooking stove according to claim 1, characterized in that the second injection portion (44) encloses and forms a second injection cavity (442), the second injection cavity (442) comprises a contraction section (4421), a throat section (4422), a primary diffusion section (4423) and a secondary diffusion section (4424) which are distributed along the gas flow direction, one end of the contraction section (4421) away from the throat section (4422) is connected with a nozzle mounting plate (47), and the secondary diffusion section (4424) is communicated with the second gas mixing portion (42).

20. The cooktop of claim 1, further comprising:

the panel is connected with the bottom shell (1) to form a kitchen range cavity in a surrounding mode.