Plasma combustion device and electric flame stove

Abstract

The invention discloses a plasma combustion device and an electric flame stove. The plasma combustion device comprises a cathode spray pipe, an upper ceramic pipe, a lower ceramic pipe, a discharge outer needle and an anode inner needle, the interior of the discharge outer needle is a cavity, the top end of the discharge outer needle is in a closed cone shape, and the discharge outer needle is arranged on the outer side of the anode inner needle in a sleeving manner. The working gas exchanges heat with the discharge outer needle in all directions, so that the thermal load of the discharge outer needle is reduced, and the service life of the discharge outer needle is prolonged. The high-heat working gas is more easily broken down to form high-density plasma, and the hot gas working medium is easily subjected to ionization reaction, so that the electron density in the plasma is increased, the conductivity is enhanced, the energy required for maintaining discharge is reduced, and the technical effects of preheating energy recovery and energy loss reduction are achieved; meanwhile, the turbulence degree of the working medium gas is weakened due to high heat and low density, so that stable airflow guided by laminar flow is easily formed in a discharge area, and discharge interruption caused by airflow fluctuation is avoided.

Description

Technical Field

[0001] The present invention relates to a plasma combustion device, and more particularly to an electric flame stove. Background Art

[0002] An electric flame stove is a cooking appliance that uses a plasma combustion device with multiple high-voltage discharges to ionize gas to produce high-temperature plasma for heating.

[0003] For example, the utility model patent with the authorized publication number CN219572014U discloses an electric flame heating device, which includes a conical fire outlet tube and a vortex device. The side wall of the vortex device is provided with an inclined air inlet, and an ion needle is also installed in the vortex device. The ion needle is installed at the center point of the vortex air flow that can maintain a relatively low air pressure, and the air flow moves centrifugally along the inner wall of the vortex device, which can also cool the conical fire outlet tube and the vortex device to prevent the two from being damaged due to overheating caused by high heat discharge.

[0004] However, this prior art only has a conical fire outlet tube and a vortex device, and there is no cooling setting for the ion needle with high-voltage discharge. However, the high temperature during discharge will cause the melting and sublimation of the metal electrode.

[0005] At the same time, in this prior art, the cold air flow generated by the air pressurizing device enters the interior of the vortex device to form a rotating air flow, and the rotating movement of the cold gas with high density is prone to turbulent phenomena, resulting in aerodynamic loss, and the air flow fluctuation is also likely to cause discharge interruption. Summary of the Invention

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

[0007] A plasma combustion device includes: a cathode nozzle, an upper ceramic tube, a lower ceramic tube, a discharge outer needle, and an anode inner needle; The interior of the discharge outer needle is a cavity, and its top end is a closed conical shape. The discharge outer needle is sleeved outside the anode inner needle; The anode inner needle is provided with an air intake groove that communicates up and down inside, and a plurality of ventilation grooves are evenly arranged on the outer side of the anode inner needle. A regenerative cooling space is formed between the top of the anode inner needle and the inner wall of the top of the discharge outer needle, so that the air intake groove communicates with the plurality of ventilation grooves; A plurality of ventilation holes corresponding to and communicating with the ventilation grooves are opened on the side wall of the lower end of the discharge outer needle; Preferably, an installation through hole is opened at the center of the bottom of the upper ceramic tube, and the discharge outer needle passes through the installation through hole and extends upward. A plurality of centrifugal grooves corresponding to the ventilation holes are circumferentially arranged around the bottom of the upper ceramic tube; Preferably, a first limiting ring and a second limiting ring are respectively arranged on the outer sides of the bottoms of the discharge outer needle and the anode inner needle, and the lower end surface of the first limiting ring is in contact with the upper end surface of the second limiting ring; Preferably, at least two vertically communicating positioning holes are formed in the first limiting ring, a first positioning post corresponding to the positioning holes is arranged on the lower end surface of the upper ceramic tube, and a second positioning post corresponding to the positioning holes is arranged on the upper end surface of the second limiting ring. The first positioning post is inserted into the positioning hole from above the first limiting ring, and the second positioning post is inserted into the positioning hole from below the first limiting ring; Preferably, the inner diameter of the upper end of the lower ceramic tube is slightly larger than the outer diameters of the first limiting ring and the second limiting ring, so that the first limiting ring and the second limiting ring can be embedded into the upper end of the lower ceramic tube, and the inner diameter of the middle section of the lower ceramic tube is smaller than the outer diameter of the second limiting ring; Preferably, the inside of the cathode nozzle is a vertically communicating conical structure, and a third limiting ring is arranged at the bottom thereof. The inner diameter of the third limiting ring is slightly larger than the outer diameter of the top of the upper ceramic tube, so that the third limiting ring can be sleeved on the top of the upper ceramic tube; Preferably, a conductor for connecting the anode of the circuit is further arranged at the bottom of the anode inner needle.

[0008] An electric flame stove includes the plasma combustion device described in any one of the above, and further includes a stove body, a stove head top shell, a stove head bottom shell, a circuit board installed at the bottom of the stove body, and an intake fan installed on the side wall of the stove body; Preferably, the stove head top shell and the stove head bottom shell are respectively provided with upper installation holes and lower installation holes corresponding to the plasma combustion device. The inner diameter of the upper installation hole is larger than the outer diameter of the cathode nozzle and smaller than the outer diameter of the third limiting ring, and the inner diameter of the lower installation hole is larger than the outer diameter of the lower end of the lower ceramic tube and smaller than the outer diameter of the middle section of the lower ceramic tube; Preferably, both the stove head top shell and the stove head bottom shell are of metal structures. A metal support column is arranged on the lower end surface of the bottom shell, and the metal support column is electrically connected to the cathode of the circuit board; the anode of the circuit board is electrically connected to the anode inner needle and the discharge outer needle through a conductor.

[0009] Compared with the prior art, the advantages of the present invention are: The electrode split structure (discharge outer needle and anode inner needle) and the ceramic tube split structure (upper ceramic tube and lower ceramic tube) of the present invention enable each component of the plasma combustion device to be mass-produced by a mold, and there is no need for welding or threaded connection between the components. The components of the plasma combustion device are fixed by the bite force between the stove head top shell and the stove head bottom shell, which greatly reduces the production cost; The working gas of the present invention conducts heat exchange with the discharge outer needle in all directions, reduces the heat load of the discharge outer needle, prolongs the service life of the discharge outer needle, and prevents heat from further affecting electronic components; The working gas of the present invention absorbs the excess heat of the discharge outer needle and the cathode nozzle, increasing the temperature of the working gas. When the working gas enters the discharge region, the hot gas is more easily broken down to form a high-density plasma. Moreover, the hot gas working medium is prone to ionization reactions, increasing the electron density in the plasma, enhancing the conductivity, and reducing the energy required to maintain the discharge, achieving the technical effects of preheating energy recovery and reducing energy loss in the present invention; At the same time, due to the high heat and low density of the working medium gas of the present invention, the degree of turbulence thereof is weakened. Therefore, a stable air flow dominated by laminar flow is easily formed in the discharge region, avoiding the discharge interruption caused by air flow fluctuations.

[0010] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. Brief Description of the Drawings

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0012] Figure 1 is a cross-sectional schematic view of the electric flame stove of the present invention.

[0013] Figure 2 is Figure 1 the enlarged view within the A circle in

[0014] Figure 3 is a partial cross-sectional view of the upper ceramic tube and the lower ceramic tube of the present invention.

[0015] Figure 4 is a three-dimensional structure diagram of the discharge outer needle and the anode inner needle of the present invention. Detailed Description of the Embodiments

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the 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.

[0017] 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 to the present invention.

[0018] In addition, in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can also be the communication inside two elements. It can 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.

[0019] 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.

[0020] Please refer to Figures 1 to 4 , in an embodiment of the present invention, a plasma combustion device includes: a cathode nozzle 11, an upper ceramic tube 12, a lower ceramic tube 13, a discharge outer needle 14, and an anode inner needle 15.

[0021] The present invention also provides an electric flame stove, which includes a plasma combustion device, and further includes a stove body 2, a stove head top shell 3, a stove head bottom shell 4, a circuit board 5 installed at the bottom of the stove body 2, and an intake fan 6 installed on the side wall of the stove body 2. The stove head bottom shell 4 is provided with a lower installation hole 40 corresponding to the plasma combustion device. The inner diameter of the lower installation hole 40 is larger than the outer diameter of the lower end of the lower ceramic tube 13 and smaller than the outer diameter of the middle section of the lower ceramic tube 13. During installation, the lower end of the lower ceramic tube 13 is passed through the lower installation hole 40 from above the stove head bottom shell 4, so that the middle section of the lower ceramic tube 13 fits against the stove head bottom shell 4.

[0022] In an embodiment of the present invention, the inside of the discharge outer needle 14 is a cavity, and its top end is a closed conical shape. The discharge outer needle 14 is sleeved outside the anode inner needle 15. A first limiting ring 140 and a second limiting ring 150 are respectively arranged on the outer side of the bottom of the discharge outer needle 14 and the outer side of the bottom of the anode inner needle 15. The first limiting ring 140 is provided with at least two positioning holes 1400 that communicate up and down, and the upper end surface of the second limiting ring 150 is provided with a second positioning post 1500 corresponding to the positioning holes 1400.

[0023] During installation, the second positioning post 1500 is inserted into the positioning hole 1400 from below the first limiting ring 140, such that the lower end face of the first limiting ring 140 abuts against the upper end face of the second limiting ring 150 and the discharge outer needle 14 is sleeved outside the anode inner needle 15. The fitting of the second positioning post 1500 and the positioning hole 1400 enables the multiple ventilation grooves 151 formed on the outside of the anode inner needle 15 to be accurately aligned with the multiple ventilation holes 141 formed on the side wall of the lower end of the discharge outer needle 14.

[0024] In an embodiment of the present invention, the inner diameter of the upper end of the lower ceramic tube 13 is slightly larger than the outer diameters of the first limiting ring 140 and the second limiting ring 150, and the inner diameter of the middle section of the lower ceramic tube 13 is smaller than the outer diameter of the second limiting ring 150. During installation, the first limiting ring 140 and the second limiting ring 150 are inserted into the upper end of the lower ceramic tube 13, and the small inner diameter structure of the middle section of the lower ceramic tube 13 restricts the excessive downward movement of the first limiting ring 140 and the second limiting ring 150.

[0025] In an embodiment of the present invention, an installation through hole 120 is formed at the center of the bottom of the upper ceramic tube 12, and a first positioning post 121 corresponding to the positioning hole 1400 is provided on the lower end face of the upper ceramic tube 12. During installation, the discharge outer needle 14 is extended upward through the installation through hole 120, and the first positioning post 121 is inserted into the positioning hole 1400 from above the first limiting ring 140, such that the lower end face of the upper ceramic tube 12 abuts against the first limiting ring 140. The accurate positioning of the first positioning post 121 and the positioning hole 1400 enables the multiple ventilation holes 141 to be aligned with the multiple centrifugal grooves 122 provided at the bottom of the upper ceramic tube 12.

[0026] In an embodiment of the present invention, the inside of the cathode nozzle 11 has a tapered structure that is interconnected up and down, and a third limiting ring 110 is provided at its bottom. The inner diameter of the third limiting ring 110 is slightly larger than the outer diameter of the top of the upper ceramic tube 12. During installation, the third limiting ring 110 is sleeved onto the top of the upper ceramic tube 12, and the tapered structure of the cathode nozzle 11 restricts the upward movement of the top of the upper ceramic tube 12.

[0027] In an embodiment of the present invention, the furnace top shell 3 is provided with an upper installation hole 30. The inner diameter of the upper installation hole 30 is larger than the outer diameter of the cathode nozzle 11 and smaller than the outer diameter of the third limiting ring 110. During installation, the upper installation hole 30 is sleeved onto the cathode nozzle 11 from above, and the third limiting ring 110 abuts against the furnace top shell 3.

[0028] In an embodiment of the present invention, after the components of the furnace head of the electric flame stove are abutted and fitted to complete accurate positioning, the furnace top shell 3 and the furnace bottom shell 4 are fixedly connected by bolts. At this time, a biting force is generated on the overall components of the plasma combustion device between the furnace top shell 3 and the furnace bottom shell 4, so that the furnace head is integrally fixed.

[0029] In the embodiment of the present invention, both the top shell 3 and the bottom shell 4 of the burner head are metal structures. A metal support column 41 is provided on the lower end surface of the bottom shell 4 of the burner head, and the metal support column 41 is electrically connected to the cathode of the circuit board 5. The metal support column 41 of the present invention plays a role in supporting the burner head. At the same time, the cathode nozzle 11 is electrically connected to the cathode of the circuit board 5 through the top shell 3, the bottom shell 4 and the metal support column 41 of the burner head. Therefore, the cathode nozzle 11 also has the function of circuit reflux during discharge.

[0030] In the embodiment of the present invention, the anode of the circuit board 5 is electrically connected to the anode inner needle 15 and the discharge outer needle 14 through a conductor 152. When a high voltage is input to the electric flame stove, a relatively high voltage difference is generated between the discharge outer needle 14 and the cathode nozzle 11. The tip of the head of the discharge outer needle 14 discharges to ionize the passing gas, generating a high-heat plasma.

[0031] In the embodiment of the present invention, an air inlet groove 153 that communicates up and down is provided inside the anode inner needle 15. A regenerative cooling space 100 is formed between the top of the anode inner needle 15 and the inner wall of the top of the discharge outer needle 14. When the electric flame stove is working, the intake fan 6 sucks in the outside cold air for heat exchange with the components on the circuit board 5. After the air pressure in the stove body 2 increases, the gas moves towards the air inlet groove 153 of the anode inner needle 15 through the lower ceramic tube 13. When the gas enters the regenerative cooling space 100 from the air inlet groove 153, it contacts the inside of the tip of the high-temperature discharge outer needle 14 and absorbs the heat of the tip of the discharge outer needle 14 through convective heat transfer.

[0032] In the embodiment of the present invention, a plurality of ventilation grooves 151 are uniformly arranged on the outside of the anode inner needle 15. The gas in the regenerative cooling space 100 flows downward through the ventilation grooves 151, and the flowing path continuously cools the needle body of the discharge outer needle 14, preventing heat from being transferred to the circuit board 5 through the anode inner needle 15 and the conductor 152 and preventing the electronic components from being damaged due to overheating.

[0033] In the embodiment of the present invention, a plurality of centrifugal grooves 122 corresponding to the ventilation holes 141 are circumferentially arranged at the bottom of the upper ceramic tube 12. When the gas is sprayed into the centrifugal grooves 122 from the ventilation holes 141, it is forced to flow along the tangential direction under the constraint of the groove wall surface, obtaining a tangential velocity and forming a rotating air flow. The rotating air flow moves spirally upward along the wall surface of the cathode nozzle 11 to form a gas film protection layer with a uniform thickness, preventing the plasma thermal radiation from affecting the cathode nozzle 11.

[0034] In the embodiment of the present invention, therefore, when the working gas of the present invention cools components such as the circuit board 5, the anode inner needle 15, the discharge outer needle 14, and the cathode nozzle 11, the absorbed heat is directly used to enhance its own ionization ability. When the same voltage is input to the electric flame stove, the hot gas is more easily broken down to form a high-density plasma.

[0035] Due to the higher molecular kinetic energy in hot gases, when the working medium gas molecules with high heat energy collide with electrons, ionization reactions are more likely to occur, increasing the electron density in the plasma, enhancing the conductivity, and reducing the energy required to maintain the discharge, thus achieving the technical effects of preheating energy recovery and reducing energy loss in the present invention.

[0036] At the same time, due to the high heat and low density of the working medium gas of the present invention, the degree of turbulence is weakened, so a stable airflow dominated by laminar flow is easily formed in the discharge region, avoiding the discharge interruption caused by airflow fluctuations.

[0037] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, 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, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention.

Claims

1. A plasma combustion device, characterized in that, Comprising: A cathode nozzle, an upper ceramic tube, a lower ceramic tube, a discharge outer needle, and an anode inner needle; The interior of the discharge outer needle is a cavity, and its top end is a closed conical shape. The discharge outer needle is sleeved outside the anode inner needle; An air intake groove that communicates up and down is provided inside the anode inner needle. A plurality of ventilation grooves are evenly arranged on the outside of the anode inner needle. A regenerative cooling space is formed between the top of the anode inner needle and the inner wall of the top of the discharge outer needle, enabling the air intake groove to communicate with the plurality of ventilation grooves; A plurality of ventilation holes corresponding to and communicating with the ventilation grooves are provided on the side wall of the lower end of the discharge outer needle.

2. The plasma combustion device according to claim 1, characterized in that, An installation through hole is provided at the center of the bottom of the upper ceramic tube. The discharge outer needle passes through the installation through hole and extends upward. A plurality of centrifugal grooves corresponding to the ventilation holes are circumferentially arranged around the bottom of the upper ceramic tube.

3. The plasma combustion device according to claim 1, characterized in that, A first limiting ring and a second limiting ring are respectively provided on the outer side of the bottom of the discharge outer needle and the outer side of the bottom of the anode inner needle. The lower end surface of the first limiting ring is in contact with the upper end surface of the second limiting ring.

4. The plasma combustion device according to claim 3, characterized in that At least two positioning holes that communicate up and down are provided in the first limiting ring. A first positioning post corresponding to the positioning hole is provided on the lower end surface of the upper ceramic tube. A second positioning post corresponding to the positioning hole is provided on the upper end surface of the second limiting ring. The first positioning post is inserted into the positioning hole from above the first limiting ring, and the second positioning post is inserted into the positioning hole from below the first limiting ring.

5. The plasma combustion device according to claim 3, wherein, The inner diameter of the upper end of the lower ceramic tube is slightly larger than the outer diameters of the first limiting ring and the second limiting ring, such that the first limiting ring and the second limiting ring can be embedded into the upper end of the lower ceramic tube. The inner diameter of the middle section of the lower ceramic tube is smaller than the outer diameter of the second limiting ring.

6. The plasma combustion device according to claim 1, characterized in that, The interior of the cathode nozzle is a tapered structure that communicates up and down. A third limiting ring is provided at its bottom. The inner diameter of the third limiting ring is slightly larger than the outer diameter of the top of the upper ceramic tube, such that the third limiting ring can be sleeved on the top of the upper ceramic tube.

7. The plasma combustion device according to claim 1, wherein A conductor for connecting the anode of the circuit is further provided at the bottom of the anode inner needle.

8. An electric flame stove, characterized in that, Comprising the plasma combustion device according to any one of claims 1-7, further comprising a stove body, a stove head top shell, a stove head bottom shell, a circuit board installed at the bottom of the stove body, and an air intake fan installed on the side wall of the stove body.

9. The electric flame stove according to claim 8, wherein The stove head top shell and the stove head bottom shell are respectively provided with upper installation holes and lower installation holes corresponding to the plasma combustion device. The inner diameter of the upper installation hole is larger than the outer diameter of the cathode nozzle and smaller than the outer diameter of the third limiting ring. The inner diameter of the lower installation hole is larger than the outer diameter of the lower end of the lower ceramic tube and smaller than the outer diameter of the middle section of the lower ceramic tube.

10. The electric flame stove according to claim 9, characterized in that, Both the stove head top shell and the stove head bottom shell are of a metal structure. A metal support post is provided on the lower end surface of the bottom shell, and the metal support post is electrically connected to the cathode of the circuit board. The anode of the circuit board is electrically connected to the anode inner needle and the discharge outer needle through a conductor.

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