Burner and electric fire stove

Abstract

The embodiment of the invention belongs to the field of electric fire stoves, and discloses a furnace end which comprises a plurality of plasma generators fixed between a nozzle panel and a furnace end base, and any plasma generator comprises a cyclone, an electrode needle and a nozzle; any cyclone is connected with a nozzle arranged on the nozzle panel, and a connecting pipe of the cyclone is provided with one electrode needle; the nozzle is connected with the other pole of the power supply; the plasma generators are arranged in a multi-circle concentric circle mode, the distances from the electrode tips on the electrode needles in the plasma generators on the innermost circle of concentric circle to the nozzles are equal, and the distances from the electrode tips on the electrode needles in the plasma generators on the other concentric circles to the nozzles are at least a first preset distance smaller than the distances from the electrode tips on the electrode needles in the plasma generators on the other concentric circles to the nozzles. According to the furnace end, the innermost ring can spit fire while other plasma generators do not spit fire, so that constant-temperature, uniform-thermal-field and soft-fire continuous heat supply is provided to meet the scene requirements of soup cooking.

Description

Technical Field

[0001] This invention relates to the field of electric stove technology, and more particularly to a burner head and an electric stove. Background Technology

[0002] Making soup is a common dietary need. Its core requirements are low temperature (60-90℃), constant temperature, even heat distribution, and continuous heating over low heat, relying on slow simmering to fully extract the collagen and umami substances from the ingredients.

[0003] Currently, electric stoves on the market, taking flame-type electric stoves as an example, mostly have a multi-ring nozzle design. Their original design intention is mostly for rapid heating, high-heat stir-frying, and high-temperature cooking. When using low power, some nozzles can spray flames, but which nozzle sprays flames is completely random, and it is impossible to achieve the requirements of constant temperature, uniform heat field, and continuous low-heat heating. Summary of the Invention

[0004] In view of this, the present invention provides a burner and an electric stove to solve the problems mentioned in the background art.

[0005] To achieve one or more of the above objectives or other objectives, the present invention provides a furnace head, comprising: a plurality of plasma generators fixed between a nozzle panel and a furnace head base, each plasma generator comprising a cyclone separator, an electrode needle and a nozzle; each cyclone separator is connected to a nozzle disposed on the nozzle panel and the connecting pipe of the cyclone separator is provided with the electrode needle; the electrode needle is connected to one pole of a power supply and the nozzle is connected to the other pole of a power supply. The plasma generators are arranged in multiple concentric circles. In the innermost concentric circle, the distance from the electrode head to the nozzle on the electrode needle of the plasma generator is equal and is at least a first preset distance smaller than the distance from the electrode head to the nozzle on the electrode needle of the plasma generator in the other concentric circles.

[0006] Furthermore, the first preset distance is ≥1mm.

[0007] Furthermore, in the same ring of plasma generators, the distance from the electrode head on the electrode needle to the nozzle is equal, and the distances from the electrode head on the electrode needle to the nozzle in the multiple plasma generators from the inner ring to the outer ring are L1, L2…L… n ,in, L1≤L2≤L n And L2-L1≥1mm, L n -L n-1 ≥1mm.

[0008] To achieve one, some, or all of the above objectives, or other objectives, the present invention also proposes a burner head, characterized in that it comprises: a plurality of plasma generators fixed between a nozzle panel and a burner head base, each plasma generator comprising an outer cyclone separator, an inner cyclone separator, a bridge electrode, an electrode needle, and a nozzle; the inner cyclone separator is sleeved inside the outer cyclone separator and connected to a nozzle disposed on the nozzle panel; the electrode needle passes through a connecting pipe of the outer cyclone separator, the electrode head of the electrode needle is located in the inner cavity of the outer cyclone separator, and the needle foot of the electrode needle passes through the bottom of the connecting pipe for connecting to one pole of a power supply; the bridge electrode comprises an upper electrode and a lower electrode, wherein the bottom of the inner cyclone separator is provided with a through hole, the lower electrode passes through the through hole and is connected to the upper electrode and seals the through hole, the upper electrode has an electrode head on the inner side of the bottom of the inner cyclone separator and the lower electrode has an electrode head on the outer side of the bottom of the inner cyclone separator; the nozzle is connected to the other pole of a power supply through the nozzle panel; Among them, a first ionization region is formed between the outer side of the inner cyclone and the inner cavity of the outer cyclone, and a second ionization region is formed between the inner cavity of the inner cyclone and the inner cavity of the nozzle. The plasma generators are arranged in multiple concentric circles, wherein the distance from the electrode head of the upper electrode on the innermost concentric circle to the nozzle is equal and at least a first preset distance smaller than the distance from the electrode head of the upper electrode on the other concentric circles to the nozzle.

[0009] Furthermore, the first preset distance is ≥1mm.

[0010] Furthermore, in the same ring of plasma generators, the distance from the electrode head on the electrode needle to the nozzle is equal, and the distances from the electrode head on the electrode needle to the nozzle in the multiple plasma generators from the inner ring to the outer ring are L1, L2…L… n ,in, L1≤L2≤L n And L2-L1≥1mm, L n -L n-1 ≥1mm.

[0011] Furthermore, the plurality of plasma generators are arranged in concentric circles in 2 to 4 circles.

[0012] Furthermore, the distance from the electrode head of the upper section electrode to the nozzle on the non-innermost concentric circle is equal, and this distance is D1. The shortest distance from the electrode needle to the electrode head of the lower section electrode is D2, and D1+D2≤D; D is the second preset distance.

[0013] Furthermore, D≤25mm, and 2.8mm≤D1≤10mm, 3mm≤D2≤15mm.

[0014] Furthermore, the ratio of the outer diameter of the inner cyclone to the inner diameter of the outer cyclone is at least 2:5.

[0015] Furthermore, the air inlets of both the inner and outer cyclones are located at the bottom and are both oblique holes.

[0016] Furthermore, the top of the outer cyclone is provided with a first annular groove, and the top of the inner cyclone is provided with a first annular flange, the first annular flange being able to be embedded into the first annular groove to form a sealing structure.

[0017] Furthermore, the top of the internal cyclone is provided with a second annular groove, and the bottom of the nozzle can be embedded in the second annular groove to form a sealing structure.

[0018] Furthermore, the bottom of the nozzle is provided with a second annular flange, and the bottom of the nozzle together with the second annular flange can be embedded in the second annular groove to form a sealing structure.

[0019] To achieve one or more of the above objectives or other objectives, the present invention also provides an electric stove, the electric stove comprising the burner head described in any of the above claims.

[0020] Implementing the embodiments of the present invention will have the following beneficial effects: After adopting the above-mentioned burner head, since the distance from the electrode head to the nozzle of the electrode needle in the innermost concentric circle of the plasma generator is equal and at least a first preset distance smaller than the distance from the electrode head to the nozzle in the other concentric circles of the plasma generator, for example, 3mm smaller. Taking two concentric circles of plasma generators as an example, the distance from the electrode head to the nozzle in the inner circle of the plasma generator is 5mm, and the distance in the outer circle of the plasma generator is 8mm. At this time, the starting voltage can be controlled at a smaller value when the power is low. This starting voltage allows the plasma generator in the innermost concentric circle to break down the air, but prevents the other plasma generators from breaking down the air. This ensures that the innermost circle emits flame while the other plasma generators do not, thus providing constant temperature, uniform heat field, and continuous low-heat heating to meet the needs of soup making. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] in: Figure 1This is an exploded view of the furnace head structure in one embodiment of the present invention; Figure 2 This is a schematic diagram of the burner head structure in one embodiment of the present invention; Figure 3 This is a cross-sectional view of the stove head in one embodiment of the present invention; Figure 4 This is an exploded view of the furnace head structure in another embodiment of the present invention; Figure 5 This is a schematic diagram of the burner head in another embodiment of the present invention.

[0023] Reference numerals: 1. Nozzle; 11. Second annular flange; 2. Nozzle panel; 3. Upper electrode; 4. Inner cyclone; 41. First annular flange; 42. Second annular groove; 5. Lower electrode; 6. Electrode needle; 7. Outer cyclone; 71. First annular groove; 8. Furnace head base; 9. Buckle; 10. Cyclone. Detailed Implementation

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings are used to distinguish different objects and not to describe a particular order.

[0025] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0026] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0027] Reference Figures 1 to 2This invention provides a furnace head, comprising: a plurality of plasma generators fixed between a nozzle panel 2 and a furnace head base 8, each plasma generator comprising a cyclone separator 10, an electrode needle 6, and a nozzle 1; each cyclone separator 10 is connected to a nozzle 1 disposed on the nozzle panel 2, and the connecting pipe of the cyclone separator 10 is provided with the electrode needle 6; the electrode needle 6 is connected to one pole of a power supply, and the nozzle 1 is connected to the other pole of a power supply; The multiple plasma generators are arranged in concentric circles. In the innermost concentric circle, the distance from the electrode head of the electrode needle 6 to the nozzle 1 is equal and at least a first preset distance smaller than the distance from the electrode head of the electrode needle 6 to the nozzle 1 in the plasma generators of the other concentric circles. The first preset distance is ≥1mm. For example, 1mm, 1.5mm, 2mm, 3mm, etc.

[0028] In this embodiment, since the distance from the electrode head of the electrode needle 6 to the nozzle 1 in the innermost concentric circle of the plasma generator in the burner head is equal, and at least a first preset distance smaller than the distance from the electrode head of the electrode needle 6 to the nozzle 1 in the other concentric circles of the plasma generator, for example, the first preset distance is 3mm. Specifically, taking a three-ring concentric plasma generator as an example, in this case, the distance from the electrode head of the electrode needle 6 to the nozzle 1 in the innermost circle of the plasma generator is 5mm, and the distance from the electrode head of the electrode needle 6 to the nozzle 1 in the other circles of the plasma generator is 8mm. At this time, the starting voltage can be controlled to a smaller value when the power is low. This starting voltage can break through 5mm of air to generate plasma, but cannot break through 8mm of air. This allows the innermost circle to emit flame while the other plasma generators do not emit flame, thereby providing constant temperature, uniform heat field, and continuous low-heat heating to meet the needs of soup making scenarios.

[0029] In some embodiments, the distance from the electrode head on the electrode needle 6 to the nozzle 1 is equal in all plasma generators within the same ring. The distances from the electrode head on the electrode needle 6 to the nozzle 1 in the multiple plasma generators, from the inner ring to the outer ring, are L1, L2…L… n ,in, L1≤L2≤L n And L2-L1≥1mm, L n -L n-1 ≥1mm.

[0030] In this embodiment, the distance from the electrode head on the electrode needle 6 to the nozzle 1 in each concentric circle of the plasma generator is equal, and the distance increases sequentially from the inner circle to the outer circle, for example, by 2mm. Taking an electric stove with five plasma generators and five power levels as an example, this allows for flame emission from any number of plasma generators from the innermost circle to the outermost circle (one to five circles). It should be noted that the electric stove can also have continuously adjustable power, i.e., without distinct power levels, while still achieving the above effect. Furthermore, the flame intensity, i.e., the amount of plasma emitted, can be adjusted when the innermost plasma generator is emitting flame.

[0031] Reference Figures 3 to 5 This invention also proposes a burner head, characterized in that it includes: multiple plasma generators fixed between a nozzle panel 2 and a burner head base 8, each plasma generator including an outer cyclone separator 7, an inner cyclone separator 4, a bridge electrode, an electrode needle 6, and a nozzle 1; the inner cyclone separator 4 is sleeved inside the outer cyclone separator 7, and the inner cyclone separator 4 is connected to the nozzle 1 disposed on the nozzle panel 2; the electrode needle 6 passes through the connecting pipe of the outer cyclone separator 7, the electrode head of the electrode needle 6 is located in the inner cavity of the outer cyclone separator 7, and the needle foot of the electrode needle 6 passes through the bottom of the connecting pipe for connecting to one pole of the power supply; the bridge electrode includes an upper electrode 3 and a lower electrode 5, wherein the bottom of the inner cyclone separator 4 is provided with a through hole, the lower electrode 5 passes through the through hole and is connected to the upper electrode 3 and seals the through hole, the upper electrode 3 has an electrode head on the inner side of the bottom of the inner cyclone separator 4, and the lower electrode 5 has an electrode head on the outer side of the bottom of the inner cyclone separator 4; the nozzle 1 is connected to the other pole of the power supply through the nozzle panel 2; Among them, a first ionization zone is formed between the outer side of the inner cyclone 4 and the inner cavity of the outer cyclone 7, and a second ionization zone is formed between the inner cavity of the inner cyclone 4 and the inner cavity of the nozzle 1. The multiple plasma generators are arranged in concentric circles. The distance from the electrode head of the upper electrode 3 to the nozzle 1 on the innermost concentric circle is equal and at least a first preset distance smaller than the distance from the electrode head of the upper electrode 3 to the nozzle 1 on the other concentric circles. The first preset distance is ≥1mm. For example, 1mm, 1.5mm, 2mm, 3mm, etc.

[0032] In the same ring of plasma generators, the distance from the electrode head on the electrode needle 6 to the nozzle 1 is equal. The distances from the electrode head on the electrode needle 6 to the nozzle 1 in the multiple plasma generators, from the inner ring to the outer ring, are L1, L2…L… n ,in, L1≤L2≤L n And L2-L1≥1mm, L n -L n-1 ≥1mm.

[0033] In this embodiment, the burner head possesses all the advantages of the aforementioned embodiments, and these advantages and related effects are the same as those in the aforementioned embodiments, and will not be repeated here. It should be noted that the burner head has undergone further design improvements, namely, the provision of an inner cyclone separator 4 and an outer cyclone separator 7, which divides the interior of the cyclone separator 10 into two chambers: a first ionization zone and a second ionization zone. It should also be noted that the overall structure of the burner head can be similar to existing designs. Figures 3 to 5 The diagram shows a plasma generator on the burner head, with only partial illustrations of the nozzle panel 2 and burner base 8. In this embodiment, when the burner head is operating, air is blown into the first ionization zone, where it generates ozone. This ozone, along with partially ionized air, is blown into the second ionization zone and undergoes secondary ionization. During this secondary ionization, the ozone and partially ionized air form plasma, effectively suppressing ozone generation at the source. Furthermore, compared to traditional electric stoves, the plasma density increases during this secondary ionization, improving thermal efficiency. It is worth noting that the bridge electrode is preferably made of metals or alloys with good conductivity and high melting points, such as stainless steel, copper-nickel alloys, and chromium-nickel alloys. Alloys with melting points above 1400℃ are preferred, such as lower-cost stainless steel. Additionally, the upper electrode 3 and lower electrode 5 can have a T-shaped cross-section, one with internal threads and the other with external threads. After threaded connection, they form a dumbbell shape, located near the bottom of the inner cyclone separator 4, forming a sealed structure upon contact with the bottom of the inner cyclone separator 4. It is worth mentioning that the side of the upper electrode 3 and the lower electrode 5 furthest from the contact point can be designed as a pointed tip, i.e., the cross-section can be changed from a T-shaped structure to an arrow-shaped cross-section. This allows for tip discharge, enabling the electrode to break down the air at a lower voltage to generate plasma, achieving "ignition and continuous combustion." Simultaneously, it optimizes discharge efficiency, focuses energy, significantly reduces arcing voltage, and facilitates air breakdown. Based on the electric field tip effect, charges will highly accumulate at the conductor tip, forming a localized strong electric field (far higher than a flat / round tip), easily breaking through the air's insulation threshold. This allows for ionization of air to generate an electric arc / plasma without extremely high voltage, reducing circuit design complexity and making ignition more sensitive. In other embodiments, the electrode tips of the upper electrode 3 and the lower electrode 5, as well as the electrode tip on the electrode needle 6, are designed as bullet-shaped. The bullet shape has a conical transition compared to a pure pointed tip, reducing electro-corrosion and oxidation loss of the electrode tip during high-temperature discharge, extending electrode lifespan, and better adapting to the long-term high-temperature operation of electric gas stoves. Additionally, the upper electrode 3 can extend above the internal cyclone separator 4 for easier installation.

[0034] In some embodiments, the distance from the electrode head of the upper section electrode to the nozzle on the non-innermost concentric circle is equal, and this distance is D1. The closest distance from the electrode needle to the electrode head of the lower section electrode is D2, where D1+D2≤D; D is a second preset distance.

[0035] Where D ≤ 25mm, and 2.8mm ≤ D1 ≤ 10mm, 3mm ≤ D2 ≤ 15mm. That is, the sum of the closest distance D1 from nozzle 1 to the bridge electrode and the closest distance D2 from electrode needle 6 to the bridge electrode is the second preset distance D, where D is less than or equal to 25mm. For example, D1 can be set to 2.8mm, 3mm, or 5mm; D2 can be set to 3mm, 4mm, 5mm, 5.5mm, or 6.5mm. Specifically, taking an electric stove with a starting voltage of 30KV and a stable operating voltage of 5KV or 10KV as an example, D1 is set to 2.8mm, and D2 is set to 5mm. It should be noted that the starting voltage makes the distance from the electrode head of the upper section electrode on the innermost concentric circle to the nozzle less than D1. In other words, when the plasma generator on a non-innermost concentric circle breaks down air to generate plasma, the plasma generator on the innermost concentric circle will necessarily be able to break down air to generate plasma.

[0036] In this embodiment, the inventors discovered through research that the magnitude of the voltage affects the distance at which air can be broken down to generate plasma. That is, the higher the voltage, the greater the distance between the two electrodes, allowing plasma to be generated. When setting up the bridge electrode, although it is not connected to either pole of the power supply, its placement between the two electrodes (nozzle 1 and electrode needle 6) effectively shortens the distance between them. Given that the conductivity of the bridge electrode is far superior to that of air—meaning the resistance of air is much greater than the resistance of the bridge electrode—the resistance of the bridge electrode is negligible relative to the resistance of air. Experiments revealed that when the starting voltage of the electric stove is sufficient to break down the air between two electrodes at a distance of D3 to generate plasma, further increasing the distance between the two electrodes only requires setting a bridge electrode between them. The shortest distance from one electrode to the bridge electrode is D1, and the shortest distance from the other electrode to the bridge electrode is D2. By controlling D1+D2≤D3 and keeping the starting voltage constant, it is still possible to break down the air between the two electrodes at a distance of D3 to generate plasma. In this case, the generated plasma is in two segments: one segment generated between one electrode and the bridge electrode, and the other segment generated between the other electrode and the bridge electrode. The working principle of this high-efficiency burner with secondary ionization and ozone decomposition functions is an application of this research finding.

[0037] In some embodiments, the ratio of the outer diameter of the inner cyclone 4 to the inner diameter of the outer cyclone 7 is at least 2:5. For example, the outer diameter of the inner cyclone 4 is set to approximately 18mm-22mm, and the inner diameter of the outer cyclone 7 is set to approximately 25mm-30mm. More specifically, the outer diameter of the inner cyclone 4 is set to 20mm, and the inner diameter of the outer cyclone 7 is set to 26mm.

[0038] In some embodiments, the air inlets of both the inner cyclone 4 and the outer cyclone 7 are located at the bottom and are both oblique holes. These oblique holes are typically located on the sidewall of the bottom to generate rotating airflow. Specifically, when the ratio of the outer diameter of the inner cyclone 4 to the inner diameter of the outer cyclone 7 is at least 1:1, the inner cyclone 4 can have oblique holes on its bottom wall, which can also generate rotating airflow. Additionally, a groove can be provided at the lower end of the electrode needle 6, allowing it to just pass through the outer cyclone 7, so that the electrode needle 6 can be attached to the outer cyclone 7 by a snap-fit ​​9.

[0039] In some embodiments, the top of the outer cyclone 7 is provided with a first annular groove 71, and the top of the inner cyclone 4 is provided with a first annular flange 41. The first annular flange 41 can be embedded into the first annular groove 71 to form a sealing structure.

[0040] In some embodiments, the top of the inner cyclone 4 is provided with a second annular groove 42, which can be disposed on the top of the first annular flange 41; the bottom of the nozzle 1 can be embedded in the second annular groove 42 to form a sealing structure.

[0041] In some embodiments, the bottom of the nozzle 1 is provided with a second annular flange 11, and the bottom of the nozzle 1 together with the second annular flange 11 can be embedded in the second annular groove 42 to form a sealing structure.

[0042] In the above embodiments, the mating structure design of the first annular groove 71 and the first annular flange 41, as well as the mating structure design of the second annular flange 11 and the second annular groove 42, can form a sealing structure without additional processing after mating.

[0043] The present invention also proposes an electric stove, wherein the electric stove includes a high thermal efficiency burner head with secondary ionization and ozone decomposition functions as described in any of the above claims.

[0044] Obviously, the embodiments described above are merely some embodiments of the present invention, not all embodiments. The accompanying drawings show preferred embodiments of the present invention, but do not limit the patent scope of the present invention. The present invention can be implemented in many different forms; rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this invention.

Claims

1. A stove head, characterized in that, include: Multiple plasma generators are fixed between the nozzle panel and the furnace base. Each plasma generator includes a cyclone separator, an electrode needle, and a nozzle. Each cyclone separator is connected to a nozzle disposed on the nozzle panel, and the connecting pipe of the cyclone separator is provided with the electrode needle. The electrode needle is connected to one pole of the power supply, and the nozzle is connected to the other pole of the power supply. The plasma generators are arranged in multiple concentric circles. In the innermost concentric circle, the distance from the electrode head to the nozzle on the electrode needle of the plasma generator is equal and is at least a first preset distance smaller than the distance from the electrode head to the nozzle on the electrode needle of the plasma generator in the other concentric circles.

2. The burner head according to claim 1, characterized in that, The first preset distance is ≥1mm.

3. The burner head according to claim 1 or 2, characterized in that, In the same ring of plasma generators, the distance from the electrode head on the electrode needle to the nozzle is equal. The distances from the electrode head on the electrode needle to the nozzle in the multiple plasma generators, from the inner ring to the outer ring, are L1, L2…L… n ,in, L1≤L2≤L n And L2-L1≥1mm, L n -L n-1 ≥1mm.

4. A stove head, characterized in that, include: Multiple plasma generators are fixed between the nozzle panel and the furnace base. Each plasma generator includes an outer cyclone, an inner cyclone, a bridge electrode, an electrode needle, and a nozzle. The inner cyclone is sleeved inside the outer cyclone and connected to a nozzle mounted on the nozzle panel. The electrode needle passes through the connecting pipe of the outer cyclone, with its electrode head located inside the outer cyclone and its needle foot passing through the bottom of the connecting pipe to connect to one power supply pole. The bridge electrode includes an upper electrode and a lower electrode. The bottom of the inner cyclone has a through hole, through which the lower electrode passes and connects to the upper electrode, sealing the through hole. The upper electrode has an electrode head on the inner side of the bottom of the inner cyclone, and the lower electrode has an electrode head on the outer side of the bottom of the inner cyclone. The nozzle is connected to the other power supply pole through the nozzle panel. Among them, a first ionization region is formed between the outer side of the inner cyclone and the inner cavity of the outer cyclone, and a second ionization region is formed between the inner cavity of the inner cyclone and the inner cavity of the nozzle. The plasma generators are arranged in multiple concentric circles, wherein the distance from the electrode head of the upper electrode on the innermost concentric circle to the nozzle is equal and at least a first preset distance smaller than the distance from the electrode head of the upper electrode on the other concentric circles to the nozzle.

5. The burner head according to claim 4, characterized in that, The first preset distance is ≥1mm.

6. The burner head according to claim 4 or 5, characterized in that, In the same ring of plasma generators, the distance from the electrode head on the electrode needle to the nozzle is equal. The distances from the electrode head on the electrode needle to the nozzle in the multiple plasma generators, from the inner ring to the outer ring, are L1, L2…L… n ,in, L1≤L2≤L n And L2-L1≥1mm, L n -L n-1 ≥1mm.

7. The burner head according to claim 4, characterized in that, The plurality of plasma generators are arranged in concentric circles, with the number of circles being 2 to 4.

8. The burner head according to claim 4, characterized in that, The distance from the electrode head of the upper section electrode to the nozzle on the non-innermost concentric circle is equal, and this distance is D1. The shortest distance from the electrode needle to the electrode head of the lower section electrode is D2, and D1+D2≤D; D is the second preset distance.

9. The burner head according to claim 8, characterized in that, D≤25mm, and 2.8mm≤D1≤10mm, 3mm≤D2≤15mm.

10. An electric stove, characterized in that, The electric stove includes the burner head as described in any one of claims 1-9.

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