Plasma torch module and electric flame cooker

Abstract

The application discloses a plasma burner head module and an electric flame stove, which comprises a burner head shell, a cathode nozzle, a ceramic tube, an anode needle, an adjustable speed air inlet device and a circuit board. When the electric flame stove switches between low power and high power, the rotating speed of the adjustable speed air inlet device is linearly adjusted synchronously with the discharge power, the electric arc moves smoothly upward / downward along the stepped inner wall of the cathode nozzle, the switching between short arc and long arc is realized, the whole process is free of arc breaking and flameout, the combustion stability during the power switching of the electric flame stove is ensured, and the thermal conversion efficiency during large and medium fire is improved. The lower end surface of the upper limiting ring is a reverse funnel surface, which provides a guide for the discharge tip of the anode needle to pass through the upper limiting ring, meanwhile, the upper end surface of the lower limiting ring is an annular taper surface which slides downward from the inner ring to the outer ring, during assembly, the annular taper surface guides the lower limiting ring to be quickly embedded into the inner part of the lower end circumferential wall of the ceramic tube, the time for calibration by an installation worker is reduced, the production and manufacturing efficiency is improved, and the labor cost is reduced.

Description

Technical Field

[0001] This invention specifically relates to an electric flame stove. Background Technology

[0002] Electric flame stoves employ multiple high-voltage discharge devices (connected in parallel with positive and negative electrodes in a closed-circuit discharge configuration). Each device generates an electric field by blasting gas flow through high voltage. The gas flow collides with electrons in this electric field, ionizing the gas molecules and exciting plasma. This plasma, with a temperature exceeding 1000 degrees Celsius, is used to heat cookware. Currently, electric flame stoves on the market are also known as electric fire stoves, electric fire starter stoves, electric flame stoves, electric gas stoves, electric open flame stoves, plasma stoves, etc. All of these stoves utilize the working principle of high-voltage breakdown to excite plasma for heating cookware.

[0003] For example, utility model patent CN221222772U discloses a burner head structure for an electric flame stove, including a burner head top plate, a burner head bottom plate, multiple flame tubes disposed on the burner head top plate for circuit return, multiple ceramic tubes corresponding to the flame tubes, electrode needles, and a rectifier circuit board. The flame tubes in this technical solution are conical in shape with an upward contraction; when pneumatically driven plasma moves upward, it is accelerated and ejected. However, the conical structure both inside and outside the flame tube has many shortcomings: 1. The discharge gap between the tip of the electrode needle and the lower end of the inner wall of the flame tube is not much different from the discharge gap between the tip of the electrode needle and the nozzle of the flame tube. There is no graded discharge gap design, which results in the retention of a short electric arc. Consequently, when the electric flame stove is at high power, the contact efficiency between air and electric arc is low, and efficient ionization under high power cannot be achieved, thus limiting the improvement of energy utilization. 2. The accuracy of the cone angle of the fire tube is difficult to control, requiring custom-made turning tools, which increases the processing cost. Furthermore, if the cone angle deviation exceeds ±0.5°, it will directly lead to uneven discharge gap between the electrode needle and the cone surface. However, during the turning process, even slight fluctuations in the tool feed rate and workpiece speed will cause deviations in the linearity of the cone surface generatrix, which are difficult to correct through subsequent processing, thus affecting processing efficiency and increasing processing difficulty. 3. High-power electric flame stoves typically have hundreds of pairs of electrode needles, flame tubes, and ceramic tubes. However, the installation of the electrode needles is difficult. For example, when the electrode needle is inserted into the connecting groove, the tip of the electrode needle is easily stuck at the bottom of the limiting groove. It is necessary to manually calibrate the electrode needle tip to pass through the axis of the limiting groove. Then, when the retaining ring at the bottom of the electrode needle needs to be embedded in the connecting groove, it is necessary to manually calibrate the retaining ring and the inside of the connecting groove. This requires hundreds of repeated calibrations, which increases the installation difficulty and requires workers to spend time calibrating, resulting in low efficiency and indirectly increasing labor costs. Summary of the Invention

[0004] To overcome the shortcomings mentioned above, the present invention aims to provide a technical solution that can solve the above problems.

[0005] A plasma furnace head module includes: a furnace head shell, a cathode nozzle, a ceramic tube, an anode needle, an adjustable speed air inlet device, and a circuit board; The furnace head shell is composed of a top shell and a bottom shell, which together form a furnace head cavity. The cathode nozzle is installed on the top shell, and the bottom shell is provided with a flow channel. The other end of the flow channel is connected to an adjustable speed air inlet device, so that the adjustable speed air inlet device is connected to the furnace head cavity. The ceramic tube is composed of an upper circumferential wall and a lower circumferential wall. The outer diameter of the upper circumferential wall is larger than the outer diameter of the lower circumferential wall. The upper circumferential wall is installed in the furnace head cavity. The top of the upper circumferential wall abuts against the bottom of the cathode nozzle, and the lower circumferential wall extends downward through the bottom shell. The anode needle is electrically connected to one pole connection point of the circuit board, and a cathode post is provided on the lower end face of the bottom shell. The cathode post is electrically connected to the other pole connection point of the circuit board. The anode needle extends upward through the axis of the lower end circumferential wall of the ceramic tube. The outer wall of the cathode nozzle is cylindrical, and its inner wall has at least two stepped surfaces. The inner wall of the cathode nozzle is divided into a lower inner wall, a middle inner wall, and an upper inner wall. The lower inner wall, the middle inner wall, and the upper inner wall are all cylindrical surfaces. The diameter of the lower inner wall is smaller than the diameter of the middle inner wall, and the diameter of the middle inner wall is smaller than the diameter of the upper inner wall. The diameter of the lower section inner wall is smaller than the inner diameter of the upper circumferential wall of the ceramic tube, and the upper circumferential wall is provided with a tangential hole communicating with the furnace head cavity. Preferably, a lower mounting ring is provided below the bottom of the cathode nozzle, and a side mounting ring is also provided along the outer edge of its bottom; Preferably, the top shell has an upper mounting hole corresponding to the cathode nozzle, the cathode nozzle extends upward through the upper mounting hole, and its side mounting ring abuts against the edge of the upper mounting hole of the furnace head shell; the bottom shell also has a lower mounting hole corresponding to the ceramic tube, the lower end circumferential wall extends downward through the lower mounting hole, and the bottom of the upper end circumferential wall abuts against the edge of the lower mounting hole of the furnace head shell; Preferably, the inner wall of the lower circumferential wall is provided with an annular upper limit ring at the top, the outer circumferential surface of the upper end of the anode needle is provided with an annular lower limit ring, the top of the anode needle is a conical discharge tip, the discharge tip passes upward through the upper limit ring and extends into the inner cavity of the cathode nozzle, and the lower limit ring abuts against the upper limit ring. Preferably, the lower end face of the upper limit ring is an inverted funnel surface, and the upper end face of the lower limit ring is a conical surface with a slope. Preferably, the upper end face of the lower limiting ring is an annular conical surface that slides down from the inner ring to the outer ring; Preferably, the diameter of the lower inner wall is smaller than the inner diameter of the upper circumferential wall of the ceramic tube, and the upper circumferential wall is provided with a tangential hole communicating with the furnace head cavity. Preferably, the method for manufacturing the cathode nozzle is as follows: S1. Select a metal round bar billet and clamp it onto the CNC lathe chuck in one go; S2. Using a general-purpose external turning tool, first turn the outer circle of the metal round bar billet to form a cylindrical outer wall that fits the furnace head shell, and reserve the side mounting ring and the lower mounting ring. S3. Using a general-purpose internal turning tool, turn along the axial direction of the metal round bar blank to the first preset depth and diameter to form the upper inner wall of the cylindrical surface; S4. Reduce the feed depth and diameter of the internal turning tool, and continue turning with the internal turning tool to the second preset depth and diameter to form the middle section inner wall of the cylindrical surface, so that a step surface is formed between the middle section inner wall and the upper section inner wall. S5. Further reduce the feed depth and diameter of the internal turning tool, and use the internal turning tool to turn to the preset depth and diameter to form the lower section of the inner wall of the cylinder, so that another step surface is formed between the middle section inner wall and the lower section inner wall. S6. After the cathode nozzle has been turned, it is clamped in a grinding machine and the outer wall, lower inner wall, middle inner wall and upper inner wall of the cathode nozzle are finely ground and deburred to obtain a cathode nozzle with an integral structure. The present invention also proposes an electric flame stove, which includes the plasma burner module described above.

[0006] Compared with the prior art, the advantages of the present invention are: When the electric flame stove switches between low and high power, the speed of the adjustable air intake device is linearly adjusted synchronously with the discharge power. Under the synergistic effect of airflow thrust and high-voltage electric field, the plasma arc moves smoothly up / down along the stepped inner wall of the cathode nozzle, achieving seamless switching between short and long arcs. The entire process is free of arc interruption and flameout, ensuring combustion stability when the electric flame stove switches power and improving the heat conversion efficiency at high and medium flames.

[0007] The lower end face of the upper limit ring of the present invention is an inverted funnel face, which provides a guide for the discharge tip of the anode needle to pass through the upper limit ring. At the same time, the upper end face of the lower limit ring is an annular conical surface that slides down from the inner ring to the outer ring. During assembly, the annular conical surface guides the lower limit ring to quickly embed into the interior of the lower circumferential wall of the ceramic tube, reducing the calibration time of the installation workers, improving the efficiency of production and manufacturing, and reducing labor costs.

[0008] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0009] 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.

[0010] Figure 1 This is a three-dimensional structural view of this embodiment.

[0011] Figure 2 This is a cross-sectional view of the cathode nozzle of the present invention.

[0012] Figure 3 This is an exploded cross-sectional view of the stove head and circuit board in another embodiment.

[0013] Figure 4 This is an exploded cross-sectional view of the stove head and circuit board in this embodiment. Detailed Implementation

[0014] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0016] Furthermore, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components; they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0017] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0018] Please see Figures 1-4 In this embodiment of the invention, the plasma burner module is the core discharge heating component of the electric flame stove, which is adapted to the power adjustment requirements of household or commercial electric flame stoves. The whole includes a burner shell 1, a cathode nozzle 2, a ceramic tube 3, an anode needle 4, an adjustable speed air intake device 5, and a circuit board 6. In this invention, the cathode nozzle 2, ceramic tube 3, and anode needle 4 are arranged in a one-to-one correspondence, forming a plasma module. Typically, a low-power electric flame stove has three to six plasma modules, a household electric flame stove has ten to fifty plasma modules, and a high-power commercial electric flame stove has seventy to two hundred plasma modules. The number of plasma modules is set according to the rated power requirement and is not limited in this invention.

[0019] In this embodiment of the invention, the top shell 11 and bottom shell 12 of the burner head outer shell 1 are both independent shells, which together form a well-sealed burner head cavity 100. The cathode nozzle 2 is vertically installed on the top shell 11, the ceramic tube 3 is vertically inserted through the bottom shell 12 and the top surface of the ceramic tube 3 abuts against the bottom of the cathode nozzle 2, the anode needle 4 is coaxially inserted inside the ceramic tube 3 and the top end of the anode needle 4 extends into the inner cavity of the cathode nozzle 2, the adjustable speed air intake device 5 is connected to the flow channel 121 of the bottom shell 12 to provide controllable airflow for the discharge area, the circuit board 6 provides a high-voltage discharge circuit for the anode needle 4 and the cathode nozzle 2, and the rotation speed of the adjustable speed air intake device 5 is proportional to the output power of the electric flame stove. The electronic control adjustment of its rotation speed can be achieved using mature existing technology. For the specific working principle, refer to the technical solution of patent number 2024111178251.

[0020] The furnace head cavity 100 provides a closed space for airflow buffering and discharge protection; the top shell 11 has an upper mounting hole adapted to the cathode nozzle 2 for vertical installation and positioning of the cathode nozzle 2; the bottom shell 12 has a lower mounting hole adapted to the ceramic tube 3 for vertical insertion and positioning of the ceramic tube 3, and the bottom shell 12 is integrally formed with a flow channel 121, one end of which is connected to the inside of the furnace head cavity 100, and the other end is sealed to the air outlet of the adjustable speed air inlet device 5, so as to realize the directional delivery of airflow from the adjustable speed air inlet device 5 to the furnace head cavity 100; the lower end of the bottom shell 12 is also uniformly provided with a number of cathode pillars 122, the lower end of which is fixedly connected to the circuit board 6. The cathode pillar 122 is connected to the cathode connection point of the circuit board 6. The cathode nozzle 2, the furnace head shell 1, and the cathode pillar 122 form a circuit return path, which not only realizes the mechanical fixation of the furnace head shell 1 and the circuit board 6, but also completes the electrical conduction.

[0021] The ceramic tube 3 is a one-piece sintered alumina ceramic structure, which is resistant to high temperatures and has excellent insulation properties. It serves as an electrical isolation component between the anode needle 4 and the furnace head shell 1 and cathode nozzle 2, while also providing a coaxial mounting structure for the anode needle 4. The ceramic tube 3 is integrally formed by an upper circumferential wall 31 and a lower circumferential wall 32, which are coaxially integrated. The outer diameter of the upper circumferential wall 31 is larger than that of the lower circumferential wall 32, forming a stepped structure to meet the installation requirements of the furnace head shell 1. The upper circumferential wall 31 is housed inside the burner head cavity 100, wherein the lower mounting ring 25 of the cathode nozzle 2 is embedded in the upper circumferential wall 31, the top of the upper circumferential wall 31 abuts against the bottom of the cathode nozzle 2, and the bottom of the upper circumferential wall 31 abuts against the edge of the burner head shell 1 located at the lower mounting hole, thereby achieving axial positioning of the ceramic tube 3 inside the burner head shell 1; the lower circumferential wall 32 extends downward through the lower mounting hole of the burner head shell 1, and its outer wall is sealed with the lower mounting hole to prevent airflow leakage inside the burner head cavity 100.

[0022] In an embodiment of the present invention, a plurality of tangential holes 311 are provided on the side wall of the upper circumferential wall 31. The tangential holes 311 are evenly distributed along the circumference of the upper circumferential wall 31. One end of the tangential hole 311 is connected to the furnace head cavity 100, and the other end is connected to the inner cavity of the ceramic tube 3. The airflow in the furnace head cavity 100 enters tangentially along the inner wall of the ceramic tube 3 through the tangential holes 311, which not only provides cooling airflow for the anode needle 4, but also forms a swirling flow to drive the plasma arc axially. The top of the inner wall of the lower circumferential wall 32 is integrally formed with an annular upper limit ring 321. The inner hole of the upper limit ring 321 is the passage for the anode needle 4. Its lower end face is an inverted funnel face. The inverted funnel face is sloped from the outer edge to the inner hole, which provides guidance for the discharge tip 42 of the anode needle 4 to pass through the upper limit ring 321, so that the discharge tip 42 can pass smoothly through the upper limit ring 321 when the anode needle 4 is assembled. This design reduces the calibration time for installation workers, improves manufacturing efficiency, and reduces labor costs.

[0023] In this embodiment, as Figure 4 As shown, the anode needle 4 is the discharge anode of the plasma arc. Its lower end is directly fixedly installed on the circuit board 6 at the position corresponding to the anode needle 4. This fixing point is electrically connected to the high voltage positive electrode of the circuit board 6 through the solder pad. The upper end of the anode needle 4 passes through the internal cavity of the ceramic tube 3 along the axial direction, and the top end is a conical discharge tip 42. The discharge tip 42 passes upward through the upper limit ring 321 of the ceramic tube 3 and extends into the inner cavity of the lower section inner wall 23 of the cathode nozzle 2, forming an initial short-distance discharge gap with the lower section inner wall 23.

[0024] In another embodiment, such as Figure 3As shown, the upper end of the anode needle 4 passes through the inner cavity of the ceramic tube 3 along the axial direction, and the top end is a conical discharge tip 42. The discharge tip 42 passes upward through the upper limit ring 321 of the ceramic tube 3 and extends into the inner cavity of the lower section inner wall 23 of the cathode nozzle 2, forming an initial short-distance discharge gap with the lower section inner wall 23. A spring guide needle 61 is welded at the anode connection point of the circuit board 6 corresponding to the anode needle 4. The other end of the spring guide needle 61 is elastically connected to the anode needle 4 to achieve electrical connection.

[0025] An annular lower limiting ring 41 is integrally protruded on the outer circumferential surface of the upper end of the anode needle 4. When the upper end of the lower limiting ring 41 abuts against the lower end of the upper limiting ring 321 of the ceramic tube 3, the anode needle 4 is axially limited, and the depth of the discharge tip 42 inserted into the inner cavity of the cathode nozzle 2 is precisely controlled, avoiding the discharge gap deviation caused by the axial movement of the anode needle 4. The upper end of the lower limiting ring 41 is an annular conical surface that slides down from the inner ring to the outer ring. During assembly, the annular conical surface guides the lower limiting ring 41 to quickly embed into the interior of the lower circumferential wall 32 of the ceramic tube 3, reducing the calibration time of the installation workers, improving the efficiency of production and manufacturing, and reducing labor costs.

[0026] In this embodiment of the invention, the cathode nozzle 2 is the discharge cathode of the plasma arc. Its outer wall is a standard cylindrical shape, which is adapted to the upper mounting hole of the furnace head shell 1. Its inner wall is provided with at least two stepped surfaces, which divide the inner wall from top to bottom into an upper inner wall 21, a middle inner wall 22, and a lower inner wall 23. All three inner walls are coaxial cylindrical surfaces, forming a stepped discharge cavity, which is adapted to the axial stretching requirements of the arc with the air volume.

[0027] Its working principle is as follows: When the power is low and the air volume is small, the electric arc is confined between the discharge tip of the anode needle 4 and the inner wall 23 of the lower section with the smallest inner diameter. The high electric field strength gap formed by the inner wall 23 of the lower section and the discharge tip 42 of the anode needle 4 is used to achieve rapid breakdown of the initial plasma and stable combustion of the short arc. When the power is increased and the air volume is increased accordingly, the aerodynamic force generated by the airflow will stretch the other end of the electric arc to the inner wall 22 in the middle section. The electric arc discharge gap and ionization range are expanded, which improves the air ionization efficiency and meets the cooking requirements of medium heat. When operating at high power and high air volume, the axial thrust generated by the airflow stretches the electric arc upward along the middle inner wall 22 to the upper inner wall 21 with the largest inner diameter. The stepped expansion discharge cavity expands the arc discharge gap and ionization range, improves air ionization efficiency, and forms a long arc with high efficiency discharge. In addition, the middle inner wall 22 serves as a transition cavity for arc stretching, which can effectively constrain the radial sway of the arc, ensure the continuity of the arc during the stretching process, and avoid problems such as arc breakage and flameout.

[0028] When the electric flame stove switches between low and high power, the speed of the adjustable air intake device 5 is linearly adjusted synchronously with the discharge power, the air intake volume changes synchronously with the speed, and the axial thrust of the airflow on the electric arc also changes linearly. Under the synergistic effect of the airflow thrust and the high-voltage electric field, the plasma arc moves smoothly up / down along the stepped inner wall of the cathode nozzle 2, realizing seamless switching between short and long arcs. The whole process is free of arc interruption and flameout, ensuring the combustion stability of the electric flame stove when switching power and improving the heat conversion efficiency at high and medium fire.

[0029] In this embodiment, the inner wall of the cathode nozzle 2 is divided into three stepped inner tube surfaces. In another embodiment, the inner wall of the cathode nozzle 2 can also be divided into four, five, six, seven or even more sections, all of which fall within the scope of protection of this patent.

[0030] In this embodiment of the invention, the inner diameter of the lower inner wall 23 is smaller than the inner diameter of the upper circumferential wall 31 of the ceramic tube 3. This contraction outlet structure enables the air in the cavity of the ceramic tube 3 to generate sufficient aerodynamic force to move upward and effectively form a plasma jet.

[0031] In the embodiments of the present invention, see Figure 4 The assembly process of the plasma furnace head module is as follows: 1) Invert the top shell 11, invert the cathode nozzle 2 and pass it through the upper mounting hole of the top shell 11 from top to bottom, so that the lower end face of the side mounting ring 24 abuts against the edge of the upper mounting hole. 2) Fit the top of the ceramic tube 3 onto the lower mounting ring 25 of the corresponding cathode nozzle 2, so that the top surface of the ceramic tube 3 abuts against the bottom of the cathode nozzle 2. 3) Fit the lower mounting hole of the bottom shell 12 onto the lower circumferential wall 32, so that the top shell 11 and the bottom shell 12 are closed together, and the bottom of the upper circumferential wall 31 abuts against the bottom shell 12 at the edge of the lower mounting hole. Fix the top shell 11 and the bottom shell 12 with bolts. 4) Seal the air outlet of the adjustable speed air inlet device 5 with the flow channel 121 of the bottom shell 12 to ensure that there is no leakage in the airflow. 5) Solder the bottom of the anode pin 4 to the corresponding position of the anode connection point on the circuit board 6; 6) The discharge tip 42 of the anode needle 4 is inserted into the internal cavity of the ceramic tube 3 from bottom to top, so that the discharge tip 42 passes through the upper limit ring 321 until the upper end face of the lower limit ring 41 abuts against the lower end face of the upper limit ring 321. At this time, the discharge tip 42 is precisely inserted into the inner cavity of the lower section inner wall 23 of the cathode nozzle 2. 7) Secure the lower end of the cathode post 122 at the bottom of the furnace head shell 1 to the cathode connection point of the circuit board 6 with bolts.

[0032] In an embodiment of the present invention, the method for manufacturing the cathode nozzle 2 is as follows: S1. Select a metal round bar billet and clamp it onto the CNC lathe chuck in one go; S2. Using a general-purpose external turning tool, first turn the outer circle of the metal round bar billet to form a cylindrical outer wall that matches the furnace head shell 1, and reserve the side mounting ring 24 and the lower mounting ring 25. S3. Using a general-purpose internal turning tool, the metal round bar blank is turned along the axial direction to the first preset depth and diameter to form the upper inner wall 21 of the cylindrical surface; S4. Reduce the feed depth and diameter of the internal turning tool, and continue turning with the internal turning tool to the second preset depth and diameter to form the middle section inner wall 22 of the cylindrical surface. After turning, a step surface is naturally formed between the middle section inner wall 22 and the upper section inner wall 21. S5. Further reduce the feed depth and diameter of the internal turning tool, and use the internal turning tool to turn to the preset depth and diameter to form the lower section inner wall 23 of the cylindrical surface. After turning, another step surface is naturally formed between the middle section inner wall 22 and the lower section inner wall 23. S6. After the cathode nozzle 2 has been turned, it is clamped on a grinding machine and the outer wall, lower inner wall 23, middle inner wall 22 and upper inner wall 21 of the cathode nozzle 2 are finely ground and deburred to obtain a cathode nozzle 2 with an integral structure.

[0033] This manufacturing method uses a general-purpose external turning tool and a straight shank internal turning tool to complete all structural machining. Compared with the existing technology where a conical cathode requires a custom-made conical surface forming turning tool, it greatly reduces the customization cost and debugging time of tooling. Ordinary CNC machining equipment can be used for production. The manufacturing method of the cathode nozzle 2 of this invention is simplified, eliminating the need for precise cone angles, which greatly shortens the machining time, improves manual efficiency, and significantly reduces the scrap rate.

[0034] An electric flame stove includes the aforementioned plasma burner module, as well as a boost circuit, a control circuit, and a stove body, etc.

[0035] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A plasma furnace head module, characterized in that, include: The furnace head shell, cathode nozzle, ceramic tube, anode needle, adjustable speed air intake device and circuit board; The furnace head shell is composed of a top shell and a bottom shell, which together form a furnace head cavity. The cathode nozzle is installed on the top shell, and the bottom shell is provided with a flow channel. The other end of the flow channel is connected to an adjustable speed air inlet device, so that the adjustable speed air inlet device is connected to the furnace head cavity. The ceramic tube is composed of an upper circumferential wall and a lower circumferential wall. The outer diameter of the upper circumferential wall is larger than the outer diameter of the lower circumferential wall. The upper circumferential wall is installed in the furnace head cavity. The top of the upper circumferential wall abuts against the bottom of the cathode nozzle, and the lower circumferential wall extends downward through the bottom shell. The anode needle is electrically connected to one pole connection point of the circuit board, and a cathode post is provided on the lower end face of the bottom shell. The cathode post is electrically connected to the other pole connection point of the circuit board. The anode needle extends upward through the axis of the lower end circumferential wall of the ceramic tube. The outer wall of the cathode nozzle is cylindrical, and its inner wall has at least two stepped surfaces. The inner wall of the cathode nozzle is divided into a lower inner wall, a middle inner wall, and an upper inner wall. The lower inner wall, the middle inner wall, and the upper inner wall are all cylindrical surfaces. The diameter of the lower inner wall is smaller than the diameter of the middle inner wall, and the diameter of the middle inner wall is smaller than the diameter of the upper inner wall.

2. The plasma furnace head module according to claim 1, characterized in that, The cathode nozzle is provided with a lower mounting ring at the bottom and a side mounting ring at the outer edge of its bottom.

3. The plasma furnace head module according to claim 1, characterized in that, The diameter of the lower inner wall is smaller than the inner diameter of the upper circumferential wall of the ceramic tube, and the upper circumferential wall is provided with a tangential hole communicating with the furnace head cavity.

4. The plasma furnace head module according to claim 2, characterized in that, The top shell has an upper mounting hole corresponding to the cathode nozzle, through which the cathode nozzle extends upward, and its side mounting ring abuts against the edge of the upper mounting hole on the furnace head shell; the bottom shell also has a lower mounting hole corresponding to the ceramic tube, through which the lower circumferential wall extends downward, and the bottom of the upper circumferential wall abuts against the edge of the lower mounting hole on the furnace head shell.

5. The plasma furnace head module according to claim 1, characterized in that, The inner wall of the lower circumferential wall is provided with an annular upper limit ring at the top, and the outer circumferential surface of the upper end of the anode needle is provided with an annular lower limit ring. The top of the anode needle is a conical discharge tip. The discharge tip passes upward through the upper limit ring and extends into the inner cavity of the cathode nozzle. The lower limit ring abuts against the upper limit ring.

6. The plasma furnace head module according to claim 5, characterized in that, The lower end face of the upper limit ring is an inverted funnel surface, and the upper end face of the lower limit ring is a conical surface with a slope.

7. The plasma furnace head module according to claim 5, characterized in that, The upper end face of the lower limit ring is an annular conical surface that slides down from the inner ring to the outer ring.

8. The plasma furnace head module according to any one of claims 1-2, characterized in that, The manufacturing method of the cathode nozzle is as follows: S1. Select a metal round bar billet and clamp it onto the CNC lathe chuck in one go; S2. Using a general-purpose external turning tool, first turn the outer circle of the metal round bar billet to form a cylindrical outer wall that fits the furnace head shell, and reserve the side mounting ring and the lower mounting ring. S3. Using a general-purpose internal turning tool, turn along the axial direction of the metal round bar blank to the first preset depth and diameter to form the upper inner wall of the cylindrical surface; S4. Reduce the feed depth and diameter of the internal turning tool, and continue turning with the internal turning tool to the second preset depth and diameter to form the middle section inner wall of the cylindrical surface, so that a step surface is formed between the middle section inner wall and the upper section inner wall. S5. Further reduce the feed depth and diameter of the internal turning tool, and use the internal turning tool to turn to the preset depth and diameter to form the lower section of the inner wall of the cylinder, so that another step surface is formed between the middle section inner wall and the lower section inner wall. S6. After the cathode nozzle has been turned, it is clamped on a grinding machine and the outer wall, lower inner wall, middle inner wall and upper inner wall of the cathode nozzle are finely ground and deburred to obtain a cathode nozzle with an integral structure.

9. An electric flame stove, characterized in that, The electric flame stove includes the plasma burner module as described in any one of claims 1 to 7.

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