A completely upward air intake burner

Abstract

The present invention relates to a completely top-inlet burner, comprising a base, an outer ring fire cover and an inner ring fire cover, wherein the base has a central cavity and an annular cavity surrounding the central cavity, wherein both the central cavity and the annular cavity are open at the top, and the inner ring fire cover and the outer ring fire cover are respectively covered in the central cavity and the annular cavity to form an inner ring mixing cavity and an outer ring mixing cavity respectively, wherein the outer ring fire cover comprises a fire cover body, wherein the fire cover body comprises a top wall, an inner ring wall and an outer ring wall, wherein the top wall is inclined from inside to outside along the circumferential direction, and outer ring fire holes are arranged on the top wall along the circumferential direction to form a flame zone, and a fire transfer groove extending up and down is provided at the upper end of the inner ring wall of the outer ring fire cover, wherein the fire transfer groove is connected with the outer ring mixing cavity, and the upper end of the fire transfer groove is adjacent to the flame zone. In the present invention, the lower end of the fire transfer groove is close to the inner ring fire cover, and the upper end is close to the flame zone on the outer ring fire cover, thereby improving the success rate of fire transfer.

Description

Technical Field

[0001] The invention relates to the field of gas stoves, and in particular to a complete upper air intake type burner. Background Art

[0002] Traditional upper air intake gas burners generally have the problem of low ejection efficiency due to the limitation of their own structure. For example, the Chinese invention patent with application number 201711370764.X (publication number CN108036320A) discloses an upper burner, which includes a fire cover, a middle plate and a base from top to bottom. The middle plate and the base are installed and matched to form a small fire ejection tube and a main fire ejection tube. A small fire outlet tube and a main fire outlet tube are also provided in the middle plate. The outlet end of the small fire ejection tube is connected to the small fire outlet tube, and the outlet end of the main fire ejection tube is connected to the main fire outlet tube. The other ends of the small fire ejection tube and the main fire ejection tube, i.e., the air inlet end, are respectively connected to the gas interface. The middle plate and the fire cover are installed and matched to form a combustion chamber, and the top surface of the fire cover is provided with a number of evenly distributed strip-shaped fire outlet holes. In this patent, due to the structural limitation of the combustion chamber, the length of the main fire ejection tube is relatively short, so that its ejection distance is short, which affects its ejection force. In addition, some upward air-intake burners on the market supplement the air required for combustion by opening holes in the panel, and soup or cooking debris can easily enter the housing of the stove through the panel, making it inconvenient to clean. Summary of the invention

[0003] The first technical problem to be solved by the present invention is to provide a completely upward air inlet burner with a high success rate of fire transfer in view of the prior art.

[0004] The second technical problem to be solved by the present invention is to provide a complete upward air inlet burner with high injection efficiency in view of the prior art.

[0005] The third technical problem to be solved by the present invention is to provide a complete upper air inlet burner with high combustion efficiency in view of the prior art.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a completely top-inlet burner, including a base, an annular outer ring fire cover and an inner ring fire cover, the base having a central cavity and an annular cavity surrounding the outer periphery of the central cavity, the central cavity and the annular cavity are both open at the top, and the inner ring fire cover and the outer ring fire cover are respectively covered in the central cavity and the annular cavity to form an inner ring mixing chamber and an outer ring mixing chamber respectively, the outer ring fire cover includes a fire cover body, the fire cover body includes an annular top wall and an inner ring wall and an outer ring wall respectively inclined or vertically extending downward from the inner and outer edges of the top wall, the top wall is inclined from inside to outside along the circumferential direction, and outer ring fire holes are arranged on the top wall along the circumferential direction to form a flame zone, and a fire transfer groove extending up and down is provided at the upper end of the inner ring wall of the outer ring fire cover, the fire transfer groove is connected to the outer ring mixing chamber, and the upper end of the fire transfer groove is adjacent to the flame zone.

[0007] Furthermore, the inner ring wall of the outer ring fire cover is formed by the inner edge of the top wall of the outer ring fire cover tilting downward from the outside to the inside to form an inclined ring wall, and the inner edge of the inclined ring wall extends vertically downward to form a vertical ring wall. The inclined ring wall and the vertical ring wall constitute the above-mentioned inner ring wall, and the above-mentioned fire transfer groove extends from the inner edge of the inner ring wall from the outside to the inside to the upper part of the vertical ring wall. In this way, the fire transfer groove can be as close to the inner ring fire cover as possible, thereby improving the success rate of fire transfer from the inner ring to the outer ring.

[0008] Preferably, the width of the fire transfer groove increases from the outside to the inside, so that the air outlet on the inner side of the fire transfer groove is larger, thereby ensuring the success rate of fire transfer from the inner ring to the outer ring, and the air outlet on the outer side of the fire transfer groove is smaller, thereby reducing the interference of the fire transfer groove on the secondary air required by the outer ring fire holes.

[0009] Preferably, the fire transfer grooves are two parallel arranged ones, so as to improve the stability of fire transfer.

[0010] Preferably, the flame zone is located at the upper part of the top wall and the outer end of the flame zone is provided with anti-burning zones at intervals along the circumferential direction to prevent the pot support from being burned.

[0011] As a preferred embodiment, two outer ring ejector tubes are also included, each outer ring ejector tube is communicated with the outer ring mixing cavity, and the two outer ring ejector tubes are arranged horizontally opposite to each other, and the air inlets of the two are staggered, so as to improve the ejection efficiency. An annular gap is left between the annular cavity and the central cavity, and a ring-shaped cover body centered on the central cavity is arranged in the annular gap, and the edge of the upper port of the cover body is connected to the outer peripheral surface of the annular cavity as a whole, and the two outer ring ejector tubes are respectively arranged at the bottom of the cover body, and the top surface of each outer ring ejector tube is connected to the bottom surface of the cover body as a whole, so that the bottom surface of the bottom wall of the annular cavity and the top of the cover body are respectively formed on both sides of the bottom of the base. The secondary air channel can promote the combustion of the flame of the inner ring fire hole and can play a role in auxiliary ignition. In addition, the setting of the cover body can realize the diversion of primary air and secondary air, and avoid the gas mixture after combustion from mixing into each ejector tube, so as to ensure the normal combustion of the burner.

[0012] Furthermore, preferably, the upper surface of the cover body is inclined from top to bottom along the circumferential direction, and the bottom surface of the bottom wall of the annular cavity corresponding to each secondary air channel is inclined upward from outside to inside, so that each secondary air channel is inclined upward, thereby reducing the length of each secondary air channel, thereby reducing the resistance of air flow. In addition, during the combustion process, the temperature of the air around the burner increases as the distance from the burner decreases, and gradually increases as the pressure acts, and the obliquely upward secondary air channel is close to the hot secondary air flow direction, thereby reducing the energy loss in the flow.

[0013] Furthermore, the bottom surface of the bottom wall of the annular cavity corresponding to each secondary air channel spirals upward from the outer ring ejector tube on one side to the outer ring ejector tube on the other side, so that the airflow forms a vortex in the secondary air channel, which can then reduce the speed of the secondary air inner ring fire hole, further enhancing the effect of stabilizing flame and assisting ignition.

[0014] In order to enable the airflow to flow better in each secondary air channel, the upper surface of the outer end of each outer ring ejector tube is recessed downward and the cover body is covered on the top surface of the outer ring ejector tube. The edge of the upper port of the cover body forms a smooth connection with the outer peripheral surface of the ring cavity, and the upper surface of the cover body and the bottom surface of the bottom wall of the ring cavity are both smooth, so that the airflow can be better guided to flow along the secondary air channel under the effect of wall adhesion.

[0015] Compared with the prior art, the advantages of the present invention are as follows: the top wall of the outer ring fire cover in the present invention is inclined from inside to outside along the circumferential direction, the outer ring fire holes are arranged on the top wall along the circumferential direction to form a flame zone, and the upper end of the inner ring wall of the outer ring fire cover is provided with a fire transfer groove extending up and down, and the upper end of the fire transfer groove is adjacent to the flame zone. In this way, the lower end of the fire transfer groove is close to the inner ring fire cover, and the upper end is close to the flame zone on the outer ring fire cover, thereby improving the success rate of fire transfer. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure of a burner in an embodiment of the present invention;

[0017] Figure 2 for Figure 1 A schematic diagram of the structure in another direction;

[0018] Figure 3 for Figure 2 Enlarged view of section G;

[0019] Figure 4 It is a partial structural exploded view of the burner in the embodiment of the present invention;

[0020] Figure 5 for Figure 4 A schematic diagram of the structure in another direction;

[0021] Figure 6 It is a partial structural exploded view of the nozzle holder in the embodiment of the present invention;

[0022] Figure 7 A partial structural cross-sectional view of a burner in an embodiment of the present invention;

[0023] Figure 8 for Figure 7 Enlarged view of section H;

[0024] Fig. 9 It is a structural schematic diagram of a base in an embodiment of the present invention;

[0025] Fig.10 It is a schematic diagram of the structure of the ignition needle in the embodiment of the present invention;

[0026] Fig.11 for Fig.10 Schematic diagram of the structure in another direction. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below with reference to the accompanying drawings.

[0028] like Figures 1 to 11 As shown, a completely upper air intake burner comprises a base 51, an annular outer ring fire cover 52, an inner ring fire cover 53, an outer ring ejector pipe 54, an inner ring ejector pipe 55 and an ignition needle 56. The base 51 has a central cavity 511 and an annular cavity 512 arranged around the outer periphery of the central cavity 511, the central cavity 511 and the annular cavity 512 are both open at the top, and the inner ring fire cover 53 and the outer ring fire cover 52 are respectively covered on the central cavity 511 and the annular cavity 512 to form an inner ring mixing cavity 5110 and an outer ring mixing cavity 5120, respectively, and the inner ring mixing cavity 5110 and the outer ring mixing cavity 5120 are respectively connected with the inner ring ejector pipe 55 and the outer ring ejector pipe 54. In this embodiment, there are two outer ring ejector tubes 54, each outer ring ejector tube 54 is communicated with the outer ring gas mixing chamber 5120, and the two outer ring ejector tubes 54 are arranged transversely to each other, and the air inlets 128 of the two outer ring ejector tubes are staggered. The provision of two outer ring ejector tubes 54 can improve the ejection efficiency of the outer ring fire cover 52. The two outer ring ejector tubes 54 are arranged transversely, so that the air outlet of each outer ring ejector tube 54 can directly extend into the outer ring gas mixing chamber 5120, reducing the energy loss of the mixed gas in the outer ring ejector tube 54 during the transmission process, ensuring the efficient ejection of the outer ring ejector tube 54, and the air inlets 128 of the two outer ring ejector tubes 54 are staggered, so as to avoid mutual interference between the two, and further improve the ejection efficiency.

[0029] The cross-sectional size of the outer ring mixing chamber 5120 changes alternately along the circumferential direction in an increasing and decreasing manner. The air outlets of the outer ring ejector tubes 54 are respectively located at the maximum point of the cross-sectional area of ​​the outer ring mixing chamber 5120, and the decreasing direction of the cross-sectional area of ​​the outer ring mixing chamber 5120 of both outer ring mixing chambers 5120 is clockwise or counterclockwise. In this way, the two airflows flowing out of the two outer ring ejector tubes 54 can flow in the same direction (clockwise or counterclockwise) and mix with each other as the internal shape of the outer ring mixing chamber 5120 changes, thereby increasing the ejection effect. The alternating change of the cross-sectional area of ​​the outer ring mixing chamber 5120 can be achieved in a variety of forms. For the convenience of processing and manufacturing, preferably, the bottom surface of the annular cavity 512 is formed with protrusions 5121 and grooves 5122 that are alternately spaced along the circumferential direction. Furthermore, each of the above grooves 5122 is inclined from outside to inside and its width decreases in a clockwise or counterclockwise direction. The height of the protrusion 5121 adjacent to each groove 5122 increases in the same direction as the groove 5122, and its width also increases synchronously. A pair of adjacent grooves 5122 and protrusions 5121 are assembled into a circular arc section of the bottom surface of the annular cavity 512, so that the two airflows flowing out of the two outer ring ejector tubes 54 can rotate and flow in the same direction in the outer ring mixing cavity 5120, so that the two airflows can better promote each other and further enhance the ejection effect. In addition, the alternating change of the outer ring mixing cavity 5120 can reduce the volume of the outer ring mixing cavity 5120 to a certain extent, thereby preventing the explosion phenomenon caused by the excessive volume of the outer ring mixing cavity 5120 during the combustion process.

[0030] Furthermore, the end face at the highest point of the above-mentioned protrusion 5121 is a vertical face, that is, the side where the air outlet of each outer ring ejector tube 54 enters the outer ring air mixing chamber 5120 is a vertical face 5123, thereby reducing the resistance at the air outlet of the outer ring ejector tube 54, which is conducive to the airflow entering the outer ring air mixing chamber 5120 and flowing along the outer ring air mixing chamber 5120.

[0031] The ejection structure of the same burner is fixed, and the gas supply pressure of different gas pipelines is different, and high or low gas pressure will lead to abnormal combustion conditions such as flame separation or flashback. In order to increase the adaptability of the burner, the gas stove burner in the prior art generally adopts a damper structure, and the damper generally adopts a damper plate and a throttle plate structure to cooperate with the chassis opening to achieve the adjustment of the damper. For example, the Chinese invention patent with patent number ZL200520117213.9 (authorization announcement number CN2869625Y) discloses a device for adjusting the damper of a gas stove, which includes a damper plate arranged at the air inlet of the ejection pipe of the gas stove, characterized in that the periphery of the damper plate has at least one arc edge with the rotation center of the damper plate as the center of the circle, and the arc edge is provided with saw teeth with uniform intervals along the circumference, and the arc edge is meshed with a worm through the saw teeth thereon, and the worm is installed in the gas stove through a worm fixing mechanism, and its lower end extends out of the bottom shell of the gas stove. This damper structure needs to be operated under the chassis, which is very inconvenient to operate, and the opening of the chassis will cause problems such as flameout and insects entering when opening and closing the cabinet door. Therefore, in this embodiment, the inner ring ejector tube 55 is vertically penetrated at the center of the ring cavity 512. In addition, an adjustment member 57 is provided in the inner ring mixing cavity 5110. The distance between the adjustment member 57 and the air outlet of the inner ring ejector tube 55 is adjustable. Moreover, since the primary air coefficient of the atmospheric burner is usually 0.45-0.75, the distance D between the adjustment member 57 and the air outlet of the inner ring ejector tube 55 is -2mm≤D≤2mm. The distance D=2mm means that the adjusting member 57 is located above the air outlet of the inner ring ejector tube 55, and the distance D between the bottom end of the adjusting member 57 and the air outlet of the inner ring ejector tube 55 is 2mm. The distance D=-2mm means that the adjusting member 57 extends into the air outlet of the inner ring ejector tube 55, and the distance D between the bottom end of the adjusting member 57 and the air outlet of the inner ring ejector tube 55 is 2mm. Moreover, when -2mm≤D≤0, the distance between the adjusting member 57 and the air outlet of the inner ring ejector tube 55 is in a decreasing relationship with the primary air coefficient ejected by the inner ring ejector tube 55, that is, when the distance D increases, the primary air coefficient decreases, and when the distance D decreases, the primary air coefficient increases. In this embodiment, the above-mentioned adjusting member 57 is a cylinder, and the maximum diameter R of the adjusting member 57 is ≤6mm, because when R is greater than 6mm, the primary air coefficient is less than 0.45, and the combustion condition deteriorates sharply. The inner ring ejector tube 55 includes a trumpet section 551, a roar hole 552 and a diffuser section 553 from bottom to top. In the present embodiment, when the adjusting member 57 extends into the air outlet of the inner ring ejector tube 55 and continues to penetrate into the inner ring ejector tube 55, it can always be located in the air outlet of the inner ring ejector tube 55. Preferably, the length of the adjusting member 57 can penetrate into the diffuser section 553 of the inner ring ejector tube 55, so that the ejection capacity of the inner ring ejector tube 55 can be adjusted by adjusting the length of the diffuser section 553.Further preferably, the length of the adjustment member 57 can further penetrate into the roar port 552 of the inner ring ejector tube 55 , so that the intake amount of the primary air can be further adjusted by adjusting the size of the roar port 552 .

[0032] Further, in this embodiment, the inner ring fire cover 53 includes a cylindrical seat body 531 and an end cover 532 sealed on the top opening of the seat body 531, and an inner ring fire hole 530 is circumferentially arranged on the side wall of the seat body 531. The adjusting member 57 is a column, and an adjusting sleeve 5321 extends vertically downward on the lower surface of the end cover 532. The upper end of the adjusting member 57 is threadedly connected to the adjusting sleeve 5321, so that the relative distance between the adjusting member 57 and the inner ring ejection tube 55 can be adjusted by adjusting the relative position between the adjusting member 57 and the adjusting sleeve 5321. In this embodiment, the free end of the adjusting member 57 is enlarged to form an end cap 571, that is, the maximum diameter of the adjusting member 57 is at its end cap 571. Specifically, in this embodiment, the adjusting member 57 is a screw.

[0033] In this embodiment, the top edge of the inner ring fire cover 53 is recessed radially inward along the circumferential direction to form a first ring groove 533, and the first ring groove 533 is placed on the ring wall of the central cavity 511. The top edges of the cavity walls on both sides of the ring cavity 512 are recessed inward along the circumferential direction to form a second ring groove 5123, and the bottom edges of the inner ring wall 522 and the outer ring wall 523 of the outer ring fire cover 52 are respectively placed on the corresponding second ring groove 5123. The inner and outer ring fire covers 53, 52 are buckled with the base 51 up and down to form an integral part by riveting. The integrated structure makes the structure of the burner simple, easy to clean, and has fewer assembly positions, which can effectively avoid gas leakage and effectively reduce the heat dissipation of the burner, thereby improving the combustion efficiency of the burner.

[0034] The outer ring fire cover 52 is provided with an outer ring fire hole 520, and the depth of the outer ring fire hole 520 is relatively small and less than or equal to 2 mm. In the present embodiment, the relatively small depth of the outer ring fire hole 520 is achieved by a thin plate structure, that is, the entire outer ring fire cover 52 in the present embodiment adopts a thin plate structure. The relatively small depth of the outer ring fire hole 520 can reduce the resistance at the outer ring fire hole 520, thereby reducing the resistance at the air outlet of the outer ring ejector tube 54, and further improving the ejection strength of the outer ring ejector tube 54. The outer ring fire cover 52 includes a fire cover body, which includes an annular top wall 521 and an inner ring wall 522 and an outer ring wall 523 which are respectively inclined or vertically extended downward from the inner and outer edges of the top wall 521. The top wall 521 is inclined from the inside to the outside along the circumferential direction. The outer ring fire hole 520 is arranged on the top wall 521, so as to effectively prevent the overflow from remaining on the outer ring fire cover 52 and prevent the outer ring fire hole 520 from being blocked by the overflow.

[0035] The outer ring fire holes 520 are small holes and their channels are inclined outward from bottom to top. The outer ring fire holes 520 are arranged circumferentially on the top wall 521 of the outer ring fire cover 52 and arranged in parallel up and down to form a flame zone 524. The flame zone 524 is located at the upper part of the top wall 521 and the outer end of the flame zone 524 is provided with anti-burning zones 525 at intervals along the circumference to prevent the legs of the pot support from being burned. The outer ring fire holes 520 use multiple rows of small holes arranged inside and outside to increase the contact area between the flame and the air, ensuring that the mixed gas of the gas and the air is fully in contact with the secondary air, thereby ensuring the full combustion of the gas and avoiding the problem of yellow flames, and making the flame temperature more uniform. Preferably, the hole spacing between adjacent outer ring fire holes 520 is less than or equal to twice the aperture of the outer ring fire holes 520. In this embodiment, due to the small depth of the outer ring fire holes 520, too small gas resistance will lead to the problem of too fast gas outlet speed. The outer ring fire holes 520 adopt a small hole structure and are arranged in multiple rows. The flames of each outer ring fire hole 520 can interact with each other to form a strong self-stabilizing flame effect. Even if the fire holes are partially blocked, the flames can still burn stably. In this embodiment, the aperture of the outer ring fire holes 520 is less than or equal to 1.6 mm, the depth of the outer ring fire holes 520 is less than or equal to 2 mm, and the heat intensity of the fire holes is 3~5×10 3 kW / mm 2 The cooperation can effectively solve the risk of flashback and effectively improve the adaptability of the burner 5 to changes in gas pressure and fluctuations in gas composition.

[0036] The upper end of the inner ring wall 522 of the outer ring fire cover 52 is provided with a fire transfer groove 526 extending up and down, the fire transfer groove 526 is connected with the outer ring gas mixing chamber 5120, and the upper end of the fire transfer groove 526 is adjacent to the flame zone 524. In this embodiment, the inner ring wall 522 of the outer ring fire cover 52 is formed by the inner edge of the top wall 521 of the outer ring fire cover 52 being inclined downward from outside to inside to form an inclined ring wall 527, the inner edge of the inclined ring wall 527 extending vertically downward to form a vertical ring wall 528, the inclined ring wall 527 and the vertical ring wall 528 constitute the inner ring wall 522, and the fire transfer groove 526 is extended from the inner edge of the inner ring wall 522 from outside to inside to the upper part of the vertical ring wall 528, so that the fire transfer groove 526 can be as close to the inner ring fire cover 53 as possible, thereby improving the success rate of fire transfer from the inner ring to the outer ring. The width of the fire transfer groove 526 increases from the outside to the inside, so that the air outlet on the inside of the fire transfer groove 526 is larger, thereby ensuring the success rate of fire transfer from the inner ring to the outer ring, and the air outlet on the outside of the fire transfer groove 526 is smaller, thereby reducing the interference of the fire transfer groove 526 with the secondary air required by the outer ring fire hole 520. Preferably, in this embodiment, the above-mentioned fire transfer grooves 526 are arranged in parallel, thereby improving the stability of fire transfer. In addition, in this embodiment, the above-mentioned fire transfer grooves 526 are arranged above the outer ring ejector tube 54, thereby reducing the interference of secondary air on the inner fire transfer gas, making the fire transfer more stable, while reducing the influence of the fire transfer flame on the secondary air.

[0037] An annular gap is left between the annular cavity 512 and the central cavity 511. An annular cover body 58 centered on the central cavity 511 is arranged in the annular gap, and the edge of the upper port of the cover body 58 is connected to the outer peripheral surface of the annular cavity 512 as a whole. Two outer ring ejection tubes 54 are respectively arranged at the bottom of the cover body 58, and the top surface of each outer ring ejection tube 54 is connected to the bottom surface of the cover body 58 as a whole, so that secondary air passages 59 surrounded by the bottom surface of the bottom wall of the annular cavity 512 and the top surface of the cover body 58 are formed on both sides of the bottom of the base 51. An assembly port 581 is provided on the cover body 58, and the ignition needle 56 is installed in the assembly port 581. In this way, the combustion of the flame of the inner ring fire hole 530 can be promoted through the secondary air passage 59, and it can play a role in auxiliary ignition. In addition, the provision of the cover body 58 can achieve the diversion of primary air and secondary air, preventing the post-combustion gas mixture from mixing into each ejector tube, thereby ensuring the normal combustion of the burner 5.

[0038] Further, preferably, the top surface of the cover body 58 is inclined from top to bottom along the circumferential direction, and the bottom surface of the bottom wall of the annular cavity 512 corresponding to each secondary air channel 59 is inclined upward from outside to inside, so that each secondary air channel 59 is inclined upward, thereby reducing the length of each secondary air channel 59, thereby reducing the resistance of air flow. In addition, during the combustion process, the temperature of the air around the burner 5 increases as the distance from the burner 5 decreases, and gradually increases as the pressure acts, and the obliquely upward secondary air channel 59 is close to the hot secondary air flow direction, thereby reducing the energy loss in the flow.

[0039] Furthermore, the bottom surface of the bottom wall of the annular cavity 512 corresponding to each secondary air channel 59 spirally rises from the outer ring ejector tube 54 on one side to the outer ring ejector tube 54 on the other side, so that the airflow forms a vortex in the secondary air channel 59, which can then reduce the speed of the secondary air guided to the inner ring fire hole 530, further enhancing the effect of stabilizing the flame and assisting ignition.

[0040] In this embodiment, in order to enable the airflow to flow better in each secondary air channel 59, the upper surface of the outer end of each outer ring ejector tube 54 is recessed downward and the cover body 58 is covered on the top surface of the outer ring ejector tube 54. The edge of the upper port of the cover body 58 forms a smooth connection with the outer peripheral surface of the annular cavity 512, and the upper surface of the cover body 58 and the bottom surface of the bottom wall of the annular cavity 512 are both smooth, so that the airflow can be better guided to flow along the secondary air channel 59 under the effect of wall adhesion.

[0041] The side walls of the air inlet of each outer ring ejector tube 54 extend outward in the circumferential direction to form a first baffle wall 582, and the upper edge of the first baffle wall 582 is connected to the bottom surface of the cover body 58 as a whole. The outer edge of the first baffle wall 582 is located at the bottom of the cover body 58, and the outer edge extends toward the other side along the circumferential direction of the cover body 58 to form a second baffle wall 583, the free end of the second baffle wall 583 is sleeved on the outer ring ejector tube 54 and connected to the outer circumferential surface of the outer ring ejector tube 54 as a whole, and the upper edge of the second baffle wall 583 is connected to the bottom surface of the cover body 58 as a whole. Through the arrangement of the first baffle wall 582 and the second baffle wall 583, the space at the bottom of the cover body 58 is separated, so that the air inlet of each outer ring ejector tube 54 forms an independent air intake space, ensuring sufficient primary air injection and avoiding the phenomenon of two outer ring ejector tubes 54 snatching air. A nozzle holder 50 is provided below the cover 58, and includes a disc-shaped base 501. An air intake gap is formed between the lower edge of each second baffle wall 583 and the top surface of the base 501. Preferably, the lower edge of each second baffle wall 583 is wavy, which not only makes the appearance of the burner 5 beautiful, but also promotes the entry of primary air into the space separated by the first baffle wall 582 and the second baffle wall 583, and prevents overflow from flowing downward along the surface of the cover 58 and the second baffle wall 583 to block the air intake gap. In addition, a pad 5831 is provided at the bottom of both ends of each second baffle wall 583, and the bottom of each pad 5831 is respectively against the top surface of the base 501. Each pad 5831 can vertically position the burner 5, thereby improving the stability of the burner 5 installation, and can reduce the downward heat transfer during the combustion process, thereby improving the thermal efficiency and reducing the impact on the heat load.

[0042] An inner ring nozzle 502 is vertically arranged at the center of the top surface of the base 501 of the nozzle seat 50, and the inner ring ejector tube 55 is located above the inner ring nozzle 502, and the gas outlet of the inner ring nozzle 502 is opposite to the air inlet of the inner ring ejector tube 55. An outer ring nozzle 503 is arranged on both sides of the inner ring nozzle 502, and the gas outlet of each outer ring nozzle 503 is opposite to the air inlet of the corresponding outer ring ejector tube 54. In addition, each outer ring nozzle 503 is positioned with the cover body 58 through a snap-fit ​​structure, so as to facilitate the assembly of the nozzle seat 50 and the burner 5. Specifically. In this embodiment, a positioning protrusion 5031 is respectively arranged on the top of each outer ring nozzle 503, and a positioning groove 584 for the corresponding positioning protrusion 5031 to be snapped into is respectively arranged at the corresponding position of the bottom surface of the cover body 58.

[0043] The above-mentioned ignition needle 56 is vertically arranged on the nozzle seat 50, and the upper end of the ignition needle 56 passes through the assembly hole 581 on the above-mentioned cover body 58, the ignition needle 56 includes a protective shell 560 and an electrode needle inserted in the protective shell 560, one end of the electrode needle is exposed to the protective shell 560, the electrode needle includes a first electrode needle 561 as a discharge end and a second electrode needle 562 that can be used as a receiving end, and the length of the first electrode needle 561 is shorter than the second electrode needle 562. In the assembled state, the first electrode needle 561 and the second electrode needle 562 both extend vertically upward and then bend toward the inner ring fire cover 53, and the bending parts of the two are inclined in opposite directions relative to the inner ring fire cover 53, and the distance from the end of the first electrode needle 561 to the inner ring fire cover 53 is smaller than the distance from the end of the second electrode needle 562 to the inner ring fire cover 53, and the distance between the end of the first electrode needle 561 and the end of the second electrode needle 562 is the shortest distance between the two. Thus, the first electrode needle 561 can discharge preferably to the inner ring fire cover 53, and when the burner 5 circuit is blocked due to foreign matter, the second electrode needle 562 can be used for circuit conduction, thereby improving the ignition success rate and ensuring the normal operation of the burner 5. In this embodiment, the protective shell 560 is a ceramic body.

[0044] Furthermore, the overall shape of the ignition needle 56 is a vertically extending long strip. Since the lower end of the ignition needle 56 is inserted into the mounting hole 5011 of the base 501 of the above-mentioned nozzle holder 50, and the upper end is inserted into the cover body 58, the long strip shape of the ignition needle 56 can effectively reduce the blocking area of ​​the air inlet of each ejection tube, thereby reducing the influence of the setting of the ignition needle 56 on the ejection performance of the burner 5.

[0045] Furthermore, the top surface of the protective shell 560 is stepped, and the first electrode needle 561 and the second electrode needle 562 are respectively arranged on the top surface of the protective shell 560, thereby avoiding water accumulation on the top surface of the protective shell 560, thereby avoiding discharge at the root of the electrode needle caused by water accumulation.

[0046] Furthermore, the middle portion of the protective shell 560 extends outwardly in the circumferential direction to form a positioning boss 5601. When the ignition needle 56 is inserted into the base 501, the positioning boss 5601 is supported on the edge of the mounting hole 5011, so that the ignition needle 56 can be firmly inserted into the base 531. Furthermore, the bottom of the positioning boss 5031 has a reinforcing block 5602 protruding outward 5121, so as to strengthen the strength of the ignition needle 56 and prevent the ignition needle 56 from being broken when the burner 5 is disassembled.

[0047] In addition, the projection of each electrode needle on the horizontal plane does not exceed the maximum cross-section of the protective shell 560 , so that the ignition needle 56 can smoothly pass through the positioning hole 585 on the cover body 58 .

[0048] Furthermore, an ion igniter 563 that can cooperate with the ignition needle 56 is provided in the above-mentioned stove shell 1. In this way, the burner 5 in this embodiment does not need to be additionally provided with a thermocouple. The cooperation between the ion igniter 563 and the first electrode needle 561 can play the role of the thermocouple, thereby making the structure of the burner 5 simpler, avoiding the setting of the thermocouple that makes the space under the cover body 58 cramped, thereby affecting the injection performance of each injection tube.

Claims

1. A completely top-inlet burner, comprising a base (51), an annular outer ring fire cover (52) and an inner ring fire cover (53), characterized in that: The base (51) comprises a central cavity (511) and an annular cavity (512) arranged around the central cavity (511), the central cavity (511) and the annular cavity (512) are both open at the top, and the inner ring fire cover (53) and the outer ring fire cover (52) are respectively arranged on the central cavity (511) and the annular cavity (512) to form an inner ring gas mixing cavity (5110) and an outer ring gas mixing cavity (5120), respectively. The outer ring fire cover (52) comprises a fire cover body, which comprises an annular top wall (521) and an inner ring wall (522) and an outer ring wall (523) extending downwardly in an inclined manner or vertically from the inner and outer edges of the top wall (521), respectively; the top wall (521) is inclined from the inside to the outside along the circumferential direction; and outer ring fire holes (520) are arranged on the top wall (521) along the circumferential direction to form a flame zone (524). A fire transfer groove (526) extending up and down is provided at the upper end of the inner ring wall (522) of the outer ring fire cover (52), the fire transfer groove (526) is communicated with the outer ring gas mixing chamber (5120), and the upper end of the fire transfer groove (526) is adjacent to the flame zone (524); The inner ring fire cover (53) comprises a cylindrical seat body (531) and an end cover (532) sealing the top opening of the seat body (531); the width of the fire transfer groove (526) increases from the outside to the inside.

2. The full upward air intake burner according to claim 1, characterized in that: The inner ring wall (522) of the outer ring fire cover (52) is formed by the inner edge of the top wall (521) of the outer ring fire cover (52) tilting downward from the outside to the inside to form an inclined ring wall (527), and the inner edge of the inclined ring wall (527) extends vertically downward to form a vertical ring wall (528). The inclined ring wall (527) and the vertical ring wall (528) constitute the above-mentioned inner ring wall (522), and the above-mentioned fire transfer groove (526) extends from the inner edge of the inner ring wall (522) from the outside to the inside to the upper part of the vertical ring wall (528).

3. The full upward air inlet burner according to claim 1 or 2, characterized in that: The fire transfer grooves (526) are two arranged in parallel.

4. The full upward air inlet burner according to claim 1 or 2, characterized in that: The flame zone (524) is located at the upper part of the top wall (521), and the outer end of the flame zone (524) is provided with anti-burning zones (525) at intervals along the circumferential direction to prevent the legs of the pot support from being burned.

5. The full upward air inlet burner according to claim 1 or 2, characterized in that: It also includes two outer ring ejector tubes (54), each outer ring ejector tube (54) is communicated with the outer ring gas mixing chamber (5120), and the two outer ring ejector tubes (54) are arranged transversely opposite to each other, and the air inlets (128) of the two outer ring ejector tubes are staggered. An annular gap is left between the annular cavity (512) and the central cavity (511), and an annular cover body (58) centered on the central cavity (511) is arranged in the annular gap, and the edge of the upper port of the cover body (58) is connected to the outer peripheral surface of the annular cavity (512) as a whole. Two outer ring ejector tubes (54) are respectively arranged at the bottom of the cover body (58), and the top surface of each outer ring ejector tube (54) is connected to the bottom surface of the cover body (58) as a whole, so that secondary air channels (59) surrounded by the bottom surface of the bottom wall of the annular cavity (512) and the top surface of the cover body (58) are formed on both sides of the bottom of the base (51).

6. The full upward air intake burner according to claim 5, characterized in that: The top surface of the cover body (58) is inclined from top to bottom along the circumferential direction, and the bottom surface of the bottom wall of the annular cavity (512) corresponding to each secondary air channel (59) is inclined upward from outside to inside.

7. The full updraft burner according to claim 6, characterized in that: The bottom surface of the bottom wall of the annular cavity (512) corresponding to each of the secondary air passages (59) rises in a spiral from the outer ring ejector tube (54) on one side to the outer ring ejector tube (54) on the other side.

8. The full updraft burner according to claim 7, characterized in that: The upper surface of the outer end of each outer ring ejector tube (54) is recessed downwards and the cover body (58) covers the top surface of the outer ring ejector tube (54). The edge of the upper port of the cover body (58) is smoothly connected to the outer peripheral surface of the annular cavity (512), and the upper surface of the cover body (58) and the bottom surface of the bottom wall of the annular cavity (512) are both smooth.

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