Plasma burner and burner head of electric flame stove

Abstract

The present invention discloses a plasma burner, comprising: an anode needle, a ceramic tube, and a centrifugal cathode nozzle; the cathode nozzle is composed of a tube body and a swirler; a spiral flow channel is arranged outside the swirler, the bottom end of which abuts against the top surface of a limit tube, and the outside thereof is closely attached to the inner wall of the upper end of the tube body; the lower end of the tube body of the cathode nozzle is sleeved on the upper end of the ceramic tube, and the top surface of the ceramic tube abuts against the bottom surface of the limit tube, and a threaded air inlet groove is arranged on the outer side of the upper end of the ceramic tube; an axial low-flow discharge area is formed at the central axis between the head of the anode needle and the bottom of the swirler. The present invention provides an independent spiral channel, which reduces the impact and disorder of the air flow, is also beneficial to reducing the aerodynamic loss, can make the high heat spray and diffuse more evenly, and better realizes the effect of uniformly heating the bottom of the pot; an axial low-flow discharge area is formed at the central axis of the plasma burner, ensuring the stable discharge state of the anode needle in this area.

Description

Technical Field

[0001] The present invention relates to a plasma burner, and particularly to the burner head of an electric flame stove. Background Art

[0002] As a modern kitchen cooking device, an electric flame stove has unique advantages in actual use.

[0003] For example, the invention patent with the application number 202410025754.6 discloses an arc jet device and the burner head of an electric flame stove. By forming an annular constricted ejection port between a ceramic compressor in the shape of an inverted cone and a cathode tube, the flow rate of the plasma fluid is increased, and at the same time, the plasma is effectively dispersed and ejected from the cathode tube, thus avoiding the phenomenon of "overcooking".

[0004] However, there are still many technical problems in this existing technology: In the technical solution of this patent, the air intake groove introduces air into the inner cavity of the ceramic tube and forms a rotating air flow. The aerodynamic force makes the plasma move towards the ejection port in the arc channel. However, the fluid rotates in a circle along the walls of the ceramic tube and the flame jet tube, and there will be mutual collision and friction between the fluids in different layers, resulting in loss of aerodynamic force, thus weakening the rotation effect, and making the plasma unable to achieve sufficient power diffusion when ejected, resulting in local overheating of the bottom of the pot.

[0005] There are also other technical problems in this invention patent. When the anode needle and the cathode tube are in a high-voltage conduction environment, an arc effect occurs in the arc channel, breaking down the gas to maintain the conductive state, thereby ionizing the gas to generate plasma. It can be seen that the anode needle radially discharges and ionizes the gas in the air flow. The rotating air flow continuously cuts the discharge path. Although the cutting action of the air flow can inhibit arc contraction to a certain extent, too strong or unstable air flow rotation may also interfere with the discharge. When the pressure fluctuates greatly, it may cause intermittent extinction or intensity change of the plasma, which is not conducive to the stable operation of the plasma. Summary of the Invention

[0006] The present invention aims to provide a technical solution that can solve the above problems to overcome the above deficiencies.

[0007] A plasma burner includes: an anode needle, a ceramic tube, and a centrifugal cathode nozzle;

[0008] The cathode nozzle is composed of a tube body and a swirler; the middle section of the tube body is a limiting tube with a small inner diameter, and the outer diameter of the swirler is greater than the inner diameter of the limiting tube;

[0009] A spiral flow channel is provided on the outer side of the swirler, its bottom end abuts against the top surface of the limiting tube, and its outer side closely adheres to the inner wall of the upper end of the tube body;

[0010] The lower end of the tube body of the cathode nozzle is sleeved on the upper end of the ceramic tube, and the top surface of the ceramic tube abuts against the bottom surface of the limiting tube. A threaded air inlet groove is provided on the outer side of the upper end of the ceramic tube;

[0011] Preferably, the outer diameter of the head of the anode needle is greater than the inner diameter of the ceramic tube, and the lower end of the anode needle passes through the inside of the ceramic tube and is connected and fixed to the nut below;

[0012] Preferably, both the anode needle and the cathode nozzle are of metal structure;

[0013] Preferably, an axial low-flow discharge area is formed at the central axis between the head of the anode needle and the bottom of the swirler;

[0014] Preferably, the outer diameter of the upper end of the ceramic tube is greater than the inner diameter of the limiting tube;

[0015] Preferably, the spiral direction of the spiral flow channel is the same as that of the threaded air inlet groove.

[0016] The present invention also provides a burner head of an electric flame stove, including the plasma burner described in any one of the above;

[0017] Preferably, it further includes a blower, a top plate and a bottom shell. The top plate and the bottom shell enclose a furnace cavity. The blower communicates the furnace cavity with the outside of the burner head. The top plate and the bottom shell are respectively provided with a first installation hole and a second installation hole corresponding to the plasma burner;

[0018] Preferably, a limiting ring is provided at the bottom of the tube body, and the outer diameter of the limiting ring is greater than the diameter of the first installation hole;

[0019] Preferably, the outer diameter of the upper end of the ceramic tube is greater than the diameter of the second installation hole, so that after the lower end of the ceramic tube passes through the second installation hole, the upper end of the ceramic tube abuts against the bottom shell along the edge of the second installation hole.

[0020] Compared with the prior art, the advantages of the present invention are as follows: The present invention sets up an independent spiral channel, which reduces the impact and disorder of the air flow, and is also beneficial to reducing the aerodynamic loss. It can make the high heat spray out and diffuse more evenly, and better achieve the effect of evenly heating the bottom of the pot; An axial low-flow discharge area is formed at the central axis of the plasma burner to ensure the stable discharge state of the anode needle in this area.

[0021] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a structural cross-sectional view of the burner head of the electric flame stove of the present invention.

[0024] Figure 2 Is Figure 1 The enlarged view within circle A in

[0025] Figure 3 It is a structural schematic diagram of the ceramic tube of the present invention.

[0026] Figure 4 It is a three-dimensional structural view of the ceramic tube of the present invention.

[0027] Figure 5 It is a three-dimensional structural view of the swirler of the present invention.

[0028] Figure 6 It is a three-dimensional view of the top plate and the bottom shell of the burner head of the present invention. Detailed implementation manners

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0031] In addition, in the description of the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and may also be the communication inside two components. It may be a wireless connection or a wired connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In addition, the technical features involved in different embodiments of the present invention described hereinafter can be combined with each other as long as they do not conflict with each other.

[0033] Please refer to Figures 1 to 2 , in an embodiment of the present invention, a plasma burner includes: an anode needle 41, a ceramic tube 42, and a centrifugal cathode nozzle 43;

[0034] In an embodiment of the present invention, the cathode nozzle 43 is composed of a tube body 431 and a swirler 432; the middle section of the tube body 431 is a limiting tube 4310 with a small inner diameter, and the outer diameter of the swirler 432 is greater than the inner diameter of the limiting tube 4310. To prepare the cathode nozzle 43, the tube body 431 and the swirler 432 are prepared through two different molds; the swirler 432 is placed inside the upper end of the tube body 431, so that the bottom end of the swirler 432 abuts against the top surface of the limiting tube 4310 along the circumference, and the swirler 432 is fixed inside the upper end of the tube body 431 by machine welding.

[0035] In an embodiment of the present invention, the lower end of the tube body 431 of the cathode nozzle 43 is sleeved on the upper end of the ceramic tube 42, and the top surface of the ceramic tube 42 abuts against the bottom surface of the limiting tube 4310. The outer diameter of the upper end of the ceramic tube 42 is greater than the inner diameter of the limiting tube 4310;

[0036] As Figures 1 - 2 shown, the tube body 431 restricts the radial movement of the ceramic tube 42, and uses the reaction force generated by the fixed connection between the top plate 1 and the bottom shell 2 of the burner head on each component of the plasma burner to fix the ceramic tube 42 between the limiting tube 4310 and the bottom shell 2 and restrict the up and down movement of the ceramic tube 42.

[0037] In an embodiment of the present invention, the outer diameter of the head of the anode needle 41 is greater than the inner diameter of the ceramic tube 42, and the lower end of the anode needle 41 passes through the inside of the ceramic tube 42 and is fixedly connected to the lower nut 410.

[0038] Both the anode needle 41 and the cathode nozzle 43 are metal structures, and a specific distance is reserved between the two. When the burner works, a high voltage is applied between the anode needle 41 and the cathode nozzle 43 to form a strong electric field. Under the action of the strong electric field, the gas in the cathode nozzle 43 is ionized to generate plasma.

[0039] As Figures 2 - 5 shown, in the embodiment of the present invention, the threaded air inlet groove 420 on the outer side of the upper end of the ceramic tube 42 is used to introduce working gas, and the threaded air inlet groove 420 is a spiral groove. When the gas enters through the threaded air inlet groove 420, a swirling air flow will be generated along the shape of the thread; As Figure 2 shown, after the swirling air flow enters the limiting tube 4310, it still maintains a centrifugal motion state. The flow velocity of the rapidly spiraling gas at the central axis between the head of the anode needle 41 and the bottom of the swirler 432 is relatively low, thereby forming an axial low-flow discharge region 200. Based on this structural feature, a stable discharge state can be maintained between the head of the anode needle 41 and the bottom of the swirler 432, continuously ionizing the working gas, and then generating high-temperature plasma.

[0040] In the embodiment of the present invention, a spiral flow channel 4320 is provided on the outer side of the swirler 432. The spiral flow channel 4320 is a spiral groove. After the rotating plasma fluid enters the spiral flow channel 4320, it flows along a specific spiral path, strengthening the rotation effect of the plasma fluid, avoiding the phenomenon of chaotic flow between the fluids that leads to aerodynamic loss, and ensuring that when the plasma is ejected, it has sufficient ejection force, so that the high heat can be quickly diffused to achieve the effect of evenly heating the bottom of the pot.

[0041] In the embodiment of the present invention, the spiral direction of the spiral flow channel 4320 is the same as that of the threaded air inlet groove 420. When the working gas enters through the threaded air inlet groove 420 to form a swirling air flow, due to the same spiral direction of the spiral flow channel 4320 and the threaded air inlet groove 420, the rotating plasma fluid can transition from the threaded air inlet groove 420 to the spiral flow channel 4320 more smoothly, reducing the impact and chaos of the air flow, which is also beneficial to reducing aerodynamic loss, enabling the high heat to be ejected and diffused more evenly, and better achieving the effect of evenly heating the bottom of the pot.

[0042] The present invention also proposes a burner head of an electric flame stove, including the plasma burner according to any one of the above;

[0043] Referring to Figures 1 - 6 , the burner head of the electric flame stove further includes a blower 3, a top plate 1 and a bottom shell 2. The top plate 1 and the bottom shell 2 enclose a furnace cavity 100. The blower 3 communicates the furnace cavity 100 with the outside of the burner head. The blower 3 inhales the air outside the burner head into the furnace cavity 100 and continuously provides flowing gas for the plasma burner through the threaded air inlet groove 420.

[0044] The top plate 1 and the bottom shell 2 are respectively provided with first mounting holes 10 and second mounting holes 20 corresponding to the plasma burner.

[0045] In the next embodiment of the present invention, a limit ring 4311 is provided at the bottom of the pipe body 431, and the outer diameter of the limit ring 4311 is larger than the diameter of the first mounting hole 10. When installing the cathode spray pipe 43, the cathode spray pipe 43 is aligned with the first mounting hole 10 from below the top plate 1, so that the upper end of the pipe body 431 passes through the first mounting hole 10 and extends upward. At this time, the limit ring 4311 will be stuck below the top plate 1, thereby performing a preliminary positioning of the cathode spray pipe 43 and restricting its further upward excessive movement.

[0046] In the next embodiment of the present invention, a second mounting hole 20 corresponding to the plasma burner is provided on the bottom case 2. The outer diameter of the upper end of the ceramic tube 42 is larger than the diameter of the second mounting hole 20. During installation, the lower end of the ceramic tube 42 is aligned with the second mounting hole 20 and passed through it. When the lower end of the ceramic tube 42 passes through the second mounting hole 20, due to the larger outer diameter of the upper end of the ceramic tube 42, it will be blocked by the edge of the second mounting hole 20 and then abut against the bottom case 2, realizing the positioning of the ceramic tube 42 on the bottom case 2.

[0047] After the overall components of the burner head of the electric flame stove are positioned, bolt fixing operations are performed. The top plate 1 generates a downward counter-biting force on the limit ring 4311 of the cathode spray pipe 43, and the bottom case 2 generates an upward supporting force on the upper end of the ceramic tube 42, realizing the reliable fixing of the components of the plasma burner and completing the installation of the entire burner head.

[0048] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention.

Claims

1. A plasma burner, characterized in that, Comprising: An anode needle, a ceramic tube, and a centrifugal cathode nozzle; The cathode nozzle is composed of a tube body and a swirler; the middle section of the tube body is a limiting tube with a small inner diameter, and the outer diameter of the swirler is greater than the inner diameter of the limiting tube; A spiral flow channel is provided on the outer side of the swirler, its bottom end abuts against the top surface of the limiting tube, and its outer side closely adheres to the inner wall of the upper end of the tube body; The lower end of the tube body of the cathode nozzle is sleeved on the upper end of the ceramic tube, and the top surface of the ceramic tube abuts against the bottom surface of the limiting tube. A threaded air inlet groove is provided on the outer side of the upper end of the ceramic tube; An axial low-flow velocity discharge area is formed at the central axis between the head of the anode needle and the bottom of the swirler; The spiral direction of the spiral flow channel is the same as that of the threaded air inlet groove.

2. The plasma burner according to claim 1, wherein The outer diameter of the head of the anode needle is greater than the inner diameter of the ceramic tube, and the lower end of the anode needle passes through the inside of the ceramic tube and is connected and fixed to the nut below.

3. The plasma burner according to claim 1, characterized in that, Both the anode needle and the cathode nozzle are of metal structures.

4. The plasma burner according to claim 1, characterized in that, The outer diameter of the upper end of the ceramic tube is greater than the inner diameter of the limiting tube.

5. The burner head of an electric flame stove, characterized in that, Comprising the plasma burner according to any one of claims 1-4.

6. The burner of the electric flame stove according to claim 5, characterized in that, It further includes a blower, a top plate, and a bottom shell. The top plate and the bottom shell enclose a furnace cavity. The blower communicates the furnace cavity with the outside of the furnace head. The top plate and the bottom shell are respectively provided with a first mounting hole and a second mounting hole corresponding to the plasma burner.

7. The burner of the electric flame stove according to claim 6, characterized in that, A limiting ring is provided at the bottom of the tube body, and the outer diameter of the limiting ring is greater than the diameter of the first mounting hole.

8. The burner of the electric flame stove according to claim 6, wherein, The outer diameter of the upper end of the ceramic tube is greater than the diameter of the second mounting hole. After the lower end of the ceramic tube passes through the second mounting hole, the upper end of the ceramic tube abuts against the bottom shell along the edge of the second mounting hole.

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