A plasma stove with enlarged heating area

Abstract

The present invention discloses a plasma stove with an increased heating area, comprising a base, a stove head, and an electric control unit, wherein the stove head comprises a plurality of discharge electrodes exposed from above the base, an electrode mounting plate arranged in the base for mounting the discharge electrodes, and a voltage transformer circuit unit arranged in the base, wherein the voltage transformer circuit unit is electrically connected to the electric control unit and the discharge electrodes; at least one negative electrode is also arranged on the electrode mounting plate; the plurality of discharge electrodes are arranged on the inner side and the outer side of the negative electrode; the discharge electrode is provided with a discharge tip, the discharge tip is inclined with the bottom surface of the pot and discharges toward the negative electrode, and the thermal plasma beam generated by ionization between the discharge tip and the negative electrode is in line contact with the bottom surface of the pot. The present invention enables the thermal plasma beam generated by the plasma stove to be in line contact with the bottom of the pot, thereby increasing the contact area between the thermal plasma beam and the bottom of the pot and improving the heating efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of stoves, and in particular to a plasma stove with an increased heating area. Background Art

[0002] Plasma, also known as plasma, is an ionized gaseous substance composed of positive and negative ions produced by ionization of atoms and atomic groups after some electrons are deprived. It is a macroscopic electrically neutral ionized gas with a scale larger than the Debye length. Its movement is mainly dominated by electromagnetic force and exhibits significant collective behavior. Plasma is a very good conductor. Plasma can be captured, moved and accelerated by cleverly designed magnetic fields. The development of plasma physics has provided new technologies and processes for the further development of sciences such as materials, energy, information, environmental space, space physics, and geophysics. Plasma is the fourth state of matter, different from solid, liquid and gas. Matter is composed of molecules, molecules are composed of atoms, and atoms are composed of positively charged nuclei and negatively charged electrons surrounding them. When heated to a high enough temperature or for other reasons, the outer electrons break free from the constraints of the nucleus and become free electrons, just like students running to the playground to play freely after class. The process of electrons leaving the nucleus is called "ionization". At this time, the matter becomes a uniform "paste" composed of positively charged atomic nuclei and negatively charged electrons, so people jokingly call it ion plasma. The total amount of positive and negative charges in these ion plasmas is equal, so it is approximately electrically neutral, so it is called plasma.

[0003] A plasma stove is a new type of stove that utilizes the characteristics of plasma, uses high voltage electricity to break through the air to form thermal plasma, converts electrical energy into thermal energy, and ultimately obtains a thermal plasma beam of ideal length and function, generating a thermal plasma beam similar to flame characteristics to heat the pot for cooking.

[0004] The discharge electrode 4' in the existing plasma stove head is generally arranged vertically upward. Figure 1 As shown in the figure, the discharge tip of the discharge electrode 4' is directly vertically upward toward the bottom surface of the pot 200', so that the thermal plasma beam generated by the ionization of air after the discharge electrode 4' discharges is also vertically upward, and the thermal plasma beam makes point contact with the bottom of the pot at its top point, which results in a limited contact area between a single thermal plasma beam and the bottom of the pot, thereby reducing the heating efficiency of the plasma stove.

[0005] Therefore, the prior art needs to be improved. Summary of the invention

[0006] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a plasma stove with an increased heating area, so that the hot plasma beam generated by the plasma stove can make linear contact with the bottom of the pot, thereby increasing the contact area between the hot plasma beam and the bottom of the pot and improving the heating efficiency.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A plasma stove with an increased heating area comprises a base, a stove head arranged on the base, and an electric control unit arranged on the base, wherein the stove head comprises a plurality of discharge electrodes exposed from above the base, and an electrode mounting plate arranged in the base for mounting the discharge electrodes, and a voltage conversion circuit unit arranged in the base, wherein the voltage conversion circuit unit is electrically connected to the electric control unit and the discharge electrodes;

[0009] Among them, at least one negative electrode is also arranged on the electrode mounting plate; the multiple discharge electrodes are arranged on the inner side and the outer side of the negative electrode; the discharge electrode is provided with a discharge tip, the discharge tip is inclined with the bottom surface of the cookware and discharges toward the negative electrode, and the thermal plasma beam generated by ionization between the discharge tip and the negative electrode is in line contact with the bottom surface of the cookware.

[0010] Wherein, the negative electrode is a ring-shaped negative electrode arranged in the middle of the upper end surface of the electrode mounting plate;

[0011] The plurality of discharge electrodes are arranged in an annular arrangement on the inner and outer rings of the annular negative electrode.

[0012] Wherein, the distance between the discharge tip and the negative electrode is smaller than the distance between the discharge tip and the bottom of the pot; and / or,

[0013] The height from the discharge tip to the electrode mounting plate is less than or equal to the height from the top surface of the negative electrode to the electrode mounting plate.

[0014] The discharge electrode comprises a vertically arranged mounting rod and a discharge nozzle arranged at the upper end of the mounting rod, the end of the discharge nozzle is the discharge tip, the lower end of the mounting rod is fixed to the electrode mounting plate, and the discharge nozzle is arranged at an angle to the mounting rod.

[0015] Among them, a mounting handle is provided at the lower end of the mounting rod, an abutment step is provided at the upper end of the mounting handle, a mounting screw hole is provided at the bottom of the mounting handle, and the mounting handle passes through the electrode mounting plate from the upper end surface of the electrode mounting plate and is fixed to the electrode mounting plate by a locking screw on the lower end surface of the electrode mounting plate.

[0016] The stove head further comprises a mounting shell provided below the electrode mounting plate, the mounting shell comprises an upper cover and a lower cover, the transformer circuit unit is provided in a cavity between the upper cover and the lower cover, and the upper cover is connected to the electrode mounting plate;

[0017] The upper end surface of the upper cover is also provided with a negative electrode mounting seat, and a support rod penetrating the electrode mounting plate is connected between the negative electrode mounting seat and the bottom of the annular negative electrode.

[0018] Wherein, the negative electrode mounting seat is provided with a mounting hole, and the lower end of the support rod is inserted into the mounting hole of the negative electrode mounting seat to fit tightly;

[0019] The annular negative electrode is radially provided with a connection hole, and the top end of the support rod is provided with a nut, which is accommodated in the connection hole of the annular negative electrode and connected by a screw.

[0020] Wherein, a ceramic protective sleeve is also provided outside the support rod between the annular negative electrode and the electrode mounting plate.

[0021] The upper end surface of the upper cover is also provided with a wiring groove connected to the negative electrode mounting seat, and the wiring groove is used to lay the negative electrode connection line to electrically connect the support rod and the electronic control unit;

[0022] The periphery of the negative electrode mounting seat and both sides of the wiring groove are also provided with electric-blocking grooves, and electric-blocking insulating glue is provided in the wiring groove and the electric-blocking groove.

[0023] The stove head further comprises a liftable grounding device arranged above the mounting shell, wherein the liftable grounding device protrudes upward and is provided with an elastically liftable extension end for elastically contacting the bottom of the cookware, and the extension end is electrically grounded.

[0024] The plasma stove with increased heating area of ​​the present invention has a negative electrode arranged on an electrode mounting plate in a stove head, and discharge electrodes are arranged inside and outside the negative electrode. The discharge tip of each discharge electrode is inclined with respect to the plane of the bottom of the pot and discharges toward the negative electrode. In this way, the thermal plasma beam between the discharge electrode and the negative electrode is not directly directed toward the bottom of the pot with the top end, but is in line contact with the bottom surface of the pot with the side of the thermal plasma beam. Compared with the point contact in the prior art, the contact area between the thermal plasma beam and the bottom surface of the pot is greatly increased, thereby increasing the heating area and improving the heating efficiency of the plasma stove. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0026] Figure 1A schematic diagram of point-contact heating of a pot bottom by a hot plasma beam generated by an existing plasma stove;

[0027] Figure 2 It is a structural schematic diagram of a first embodiment of a plasma stove with an increased heating area according to the present invention;

[0028] Figure 3 for Figure 1 Schematic diagram of the structure.

[0029] Figure 4 for Figure 1 Schematic cross-section of the structure;

[0030] Figure 5 A schematic diagram of the circuit principle of the first embodiment of the plasma stove with increased heating area according to the present invention;

[0031] Figure 6 This is a schematic diagram of the structure of the stove of the present invention after removing the pot support;

[0032] Figure 7 It is a schematic diagram of the layout of the discharge electrode and the annular negative electrode;

[0033] Figure 8 It is a schematic diagram of the hot plasma beam generated by the plasma stove of the present invention contacting and heating the bottom line of the pot;

[0034] Fig. 9 It is an exploded schematic diagram of the discharge electrode and the electrode mounting plate;

[0035] Fig.10 for Figure 6 a first exploded schematic diagram of the structure;

[0036] Fig.11 for Figure 6 Schematic cross-section of the structure;

[0037] Fig.12 for Fig.10 The enlarged schematic diagram of point A in the middle;

[0038] Fig.13 for Figure 6 a second exploded schematic diagram of the structure;

[0039] Fig.14 for Fig.13 Schematic diagram of the exploded view of the middle ring-shaped negative electrode and the support rod;

[0040] Fig.15 The diagram is a schematic diagram showing that the liftable grounding device of the present invention is in contact with the bottom surface of a cooker.

[0041] Description of reference numerals:

[0042] 100-plasma stove, 1-base, 2-stove head, 3-electronic control unit, 31-main control circuit, 32-power circuit, 33-leakage detection circuit, 4-discharge electrode, 41-mounting rod, 411-mounting handle, 4111-butt step, 4112-mounting screw hole, 42-discharge nozzle, 421-discharge tip, 43-locking screw, 44-locking pad, 5-electrode mounting plate, 6-transformer circuit unit, 7-cooker bracket, 8-negative electrode, 81-connection hole, 82-screw Nail, 9-mounting shell, 91-upper cover, 911-negative electrode mounting seat, 912-mounting hole, 913-wiring groove, 914-resistance groove, 92-lower cover, 921-incoming wiring port, 922-ground wiring port, 10-support rod, 101-nut, 11-ceramic protective cover, 12-liftable grounding device, 121-extending end, 13-temperature sensor, 14-plug, 15-human-computer interaction panel, 16-switch button, 17-adjustment knob, 200-cookware. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0045] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In addition, in the present invention, the descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0047] Please refer to Figures 2 to 5 The present invention proposes a plasma stove 100 with an increased heating area, comprising a base 1, a stove head 2 arranged on the base 1, and an electric control unit 3 arranged on the base 1, wherein the stove head 2 comprises a plurality of discharge electrodes 4 exposed from above the base 1, and an electrode mounting plate 5 arranged in the base 1 for mounting the discharge electrodes 4, and a transformer circuit unit 6 arranged in the base 1, wherein the transformer circuit unit 6 is electrically connected to the electric control unit 3 and the discharge electrodes 4. The stove head 2 further comprises a pot support 7 arranged on the base 1 for supporting a pot 200. The pot 200 may be made of materials such as metal pots or ceramic pots. The electrode mounting plate 5 may be a high temperature resistant insulating plate.

[0048] The electric control unit 3 is used to generate the driving power required by the transformer circuit unit 6, and control the on and off of the transformer circuit unit 6 and the output power. The driving power generated by the electric control unit 3 is a high-frequency or low-frequency low-voltage power supply. The transformer circuit unit 6 converts the low-voltage electricity input by the electric control unit 3 into high-voltage electricity and outputs it to the discharge electrode 4 for discharge. The arc generated by the discharge of the discharge electrode 4 ionizes the air to generate high-temperature plasma to heat the bottom of the pot. In the embodiment of the present invention, the electric control unit 3 and the transformer circuit unit 6 are isolated and arranged in the base 1. The electric control unit 3 is connected to an external power supply through a plug 14.

[0049] like Figure 5 As shown, the electric control unit 3 of the embodiment of the present invention includes a main control circuit 31 , a power supply circuit 32 electrically connected to the main control circuit 31 , and an output end of the power supply circuit 32 is electrically connected to an input end of the voltage conversion circuit unit 6 .

[0050] The main control circuit 31 can be controlled by a single chip microcomputer combined with a program. The main control circuit 31 controls the output of the voltage conversion circuit unit 6. The power supply circuit 32 provides driving current for the voltage conversion circuit unit 6. The power supply circuit 32 is connected to an external mains power supply through a plug 14.

[0051] Preferably, the electric control unit 3 of the present invention further includes a leakage detection circuit 33 electrically connected to the main control circuit 31. The leakage detection circuit 33 detects whether there is leakage in the base 1, the housing of the stove head 2 and the pot 200, etc. Once leakage occurs, the main control circuit 31 controls to turn off the power of the plasma cooker 100, thereby ensuring safety in use.

[0052] In the embodiment of the present invention, a human-machine interaction panel 15 is also provided on the base 1 for controlling the plasma stove 100. The human-machine interaction panel 15 can be set as a button or a touch screen. A switch button 16 and an adjustment knob 17 are also provided on the base 1 for turning on and off the plasma stove 100 and adjusting the output power. The human-machine interaction panel 15, the switch button 16 and the adjustment knob 17 are all electrically connected to the main control circuit 31.

[0053] like Figures 6 to 8 As shown, at least one negative electrode 8 is also arranged on the electrode mounting plate 5 of the plasma stove 100 of the present invention, and the multiple discharge electrodes 4 are arranged on the inner side and the outer side of the negative electrode 8. The discharge electrode 4 is provided with a discharge tip 421, and the discharge tip 421 is inclined with the bottom surface of the pot 200 and discharges toward the negative electrode 8. The thermal plasma beam generated by ionization between the discharge tip 421 and the negative electrode 8 is in line contact with the bottom surface of the pot 200. The multiple discharge electrodes 4 are arranged on the inner side and the outer side of the negative electrode 8, so that the discharge electrodes 4 can be arranged on the inner and outer sides of the negative electrode 8, and the space inside and outside the negative electrode 8 on the electrode mounting plate 5 can be fully utilized to uniformly heat the bottom of the pot. The negative electrode 8 of the present invention forms a discharge circuit with the multiple discharge electrodes 4, and the negative electrode 8 is connected to the power supply ground on the circuit of the electronic control unit 3. The negative electrode 12 of the present invention can be arranged in multiple.

[0054] The discharge tip 421 of the discharge electrode 4 of the present invention is directed toward the negative electrode 8 and is arranged at an angle to the bottom surface of the pot 200. In this way, the thermal plasma beam generated between the discharge electrode 4 and the negative electrode 8 of the present invention does not directly heat the bottom of the pot with the top of the thermal plasma beam, but makes linear contact with the bottom of the pot with the side of the thermal plasma beam. Figure 8 As shown in , compared with the point contact in the prior art, the contact area between the thermal plasma beam and the bottom of the pot is greatly increased, thereby increasing the heating area of ​​the bottom of the pot and improving the heating efficiency of the plasma stove 100.

[0055] Thirdly, the plasma stove 100 of the present invention is separately provided with the negative electrode 8, so that during use, the cookware 200 is no longer a part of the electrical circuit, which changes the method of some existing plasma stoves 100 in which the plasma beam is generated between the "discharge electrode" and the "pot", and allows the thermal plasma beam to be generated between the "discharge electrode" and the "negative electrode", thereby achieving that both metal and non-metal cookware can be used on the plasma stove 100 of the present invention, and at the same time avoids the problem that when the pot is used as the negative electrode, the plasma directly hits the bottom of the pot, causing the cookware 200 to break down under the action of a long time, thereby affecting the life of the cookware 200.

[0056] As an embodiment, the negative electrode 8 of the plasma stove 100 of the present invention is an annular negative electrode arranged in the middle of the upper end surface of the electrode mounting plate 5, and the multiple discharge electrodes 4 are arranged in an annular arrangement in the inner and outer circles of the annular negative electrode.

[0057] A plurality of discharge electrodes 4 are arranged in an annular arrangement in the inner and outer rings of the annular negative electrode, such as Figure 7As shown, the inner and outer circles of the annular negative electrode are arranged with as many discharge electrodes 4 as possible, and the negative electrode 8 is arranged as a ring-shaped whole, which is convenient for installation. At the same time, only one negative electrode connecting wire is needed for circuit connection, which is convenient for line layout. It can be understood that the annular negative electrode of this embodiment can also be provided in plurality, such as a plurality of annular negative electrodes with inner and outer circles stacked and set.

[0058] Preferably, the distance between the discharge tip 421 of the discharge electrode 4 of the plasma stove 100 of the present invention and the negative electrode 8 is smaller than the distance between the discharge tip 421 and the bottom of the pot, so that the discharge electrode 4 will not discharge toward the bottom of the pot and affect its discharge to the negative electrode 8.

[0059] Furthermore, the height from the discharge tip 421 of the discharge electrode 4 to the electrode mounting plate 5 of the plasma stove 100 of the present invention is less than or equal to the height from the top surface of the negative electrode 8 to the electrode mounting plate 5. In this way, the thermal plasma beam generated by the discharge electrode 4 and the negative electrode 8 can make line contact with the bottom of the pot with the longer length of its side, avoiding reducing the line contact area between the thermal plasma beam and the bottom of the pot.

[0060] Specifically, Fig. 9 As shown, the discharge electrode 4 of the present invention comprises a vertically arranged mounting rod 41 and a discharge tip 42 arranged at the upper end of the mounting rod 41, the end of the discharge tip 42 is the discharge tip 421, the lower end of the mounting rod 41 is fixed to the electrode mounting plate 5, and the discharge tip 42 is arranged at an angle with the mounting rod 41. The mounting rod 41 and the discharge tip 42 are both metal components, which are used to connect the transformer circuit unit 6 and discharge. The discharge tip 42 is conical to collect current to the discharge tip 421 for high-energy discharge.

[0061] Furthermore, a mounting handle 411 is provided at the lower end of the mounting rod 41, a contact step 4111 is provided at the upper end of the mounting handle 411, a mounting screw hole 4112 is provided at the bottom of the mounting handle 4111, and the mounting handle 4111 passes through the electrode mounting plate 5 from the upper end surface of the electrode mounting plate 5, and is fixed to the electrode mounting plate 5 through the locking screw 43 at the lower end surface of the electrode mounting plate 5. After the mounting handle 411 of the mounting rod 41 passes through the electrode mounting plate 5, the contact step 4111 at the upper end thereof abuts against the upper end surface of the electrode mounting plate 5, and then the locking screw 43 is screwed into the mounting screw hole 4112 at the bottom of the mounting handle 4111 to abut against the lower end surface of the electrode mounting plate 5. Preferably, a locking gasket 44 for passing through the locking screw 43 and pressing against the electrode mounting plate 5 may also be provided at the lower end surface of the electrode mounting plate 5.

[0062] like Fig.10 and Fig.11As shown, the stove head 2 of the plasma stove 100 of the present invention further includes a mounting shell 9 disposed below the electrode mounting plate 5, the mounting shell 9 includes an upper cover 91 and a lower cover 92, the transformer circuit unit 6 is disposed in a cavity between the upper cover 91 and the lower cover 92, and the upper cover 91 is connected to the electrode mounting plate 5. The mounting shell 9 can protect the transformer circuit unit 6 from external interference.

[0063] The upper end surface of the upper cover 91 is also provided with a negative electrode mounting seat 911, and a support rod 10 penetrating the electrode mounting plate 5 is connected between the negative electrode mounting seat 911 and the bottom of the annular negative electrode. The support rod 10 is used to support and fix the annular negative electrode above the electrode mounting plate 5, and the support rod 10 is also used to electrically connect the annular negative electrode and the electronic control unit 3. At least two support rods 10 of the present invention are provided, so that the annular negative electrode is stably supported above the electrode mounting plate 5. When multiple support rods 10 are provided, only one of the support rods 10 can be used for electrical connection.

[0064] Preferably, if Fig.12 As shown, the upper end surface of the upper cover 91 of the mounting housing 9 of the present invention is also provided with a wiring groove 913 connected to the negative electrode mounting seat 911, and the wiring groove 913 is used to lay a negative electrode connection line (not shown) to electrically connect the support rod 10 and the electronic control unit 3. The periphery of the negative electrode mounting seat 911 and both sides of the wiring groove 913 are also provided with a blocking groove 914, and the wiring groove 913 and the blocking groove 914 are provided with blocking insulating glue.

[0065] When the transformer circuit unit 6 is connected to a plurality of discharge electrodes 4, a plurality of wires are required to be arranged above the upper cover 91 and connected to the bottom of the discharge electrode 4. These wires and the discharge electrode 4 are positively charged, and the wiring groove 913 is provided with a negative electrode connection line of negative polarity, which easily causes the discharge electrode 4 to discharge to the negative electrode connection line in the wiring groove 913. Therefore, a layer of electric resistance groove 914 is arranged on both sides of the wiring groove 913 and the periphery of the negative electrode mounting seat 911, and an electric resistance insulating glue is arranged in the wiring groove 913 and the electric resistance groove 914 to prevent abnormal discharge and avoid affecting the normal use of the product due to abnormal discharge. When there are multiple support rods 10, only one of the negative electrode mounting seats 911 on the upper cover 91 where the support rod 10 is installed can be selected to set the wiring groove 913 and the electric resistance groove 914. This can simplify the wiring and simplify the structure of the upper cover 91. Preferably, the upper cover 91 of the housing 9 of the present invention is made of insulating material, such as plastic.

[0066] Furthermore, if Fig.11 As shown, the support rod 10 of the present invention is also provided with a ceramic protective sleeve 11 between the annular negative electrode and the electrode mounting plate 5. The ceramic protective sleeve 11 prevents the discharge electrode 4 on the electrode mounting plate 5 from discharging to the metal support rod 10 and its connecting parts, thereby avoiding abnormal discharge of the product.

[0067] Preferably, if Figure 6 As shown, a temperature sensor 13 is also provided on the outer wall of the installation shell 9 of the plasma stove 100 of the present invention and is electrically connected to the main control circuit 31. The temperature sensor 13 can detect the temperature of the installation shell 9 when the heat generated by the transformer circuit unit 6 or the plasma beam is conducted to the installation shell 9. When the actual temperature of the installation shell 9 exceeds the preset temperature during operation, the power supply of the transformer circuit unit 6 will be cut off, so that the transformer circuit unit 6 stops outputting electric energy to the discharge electrode 4 and stops discharging to ensure safe use. An incoming line connection port 921 and a grounding line connection port 922 are also provided on the outer wall of the installation shell 9. The incoming line connection port 921 electrically connects the transformer circuit unit 6 in the installation shell 9 with the power circuit 32. The grounding line connection port 922 is used to install a protective grounding wire. The protective grounding wire connects the base 1, the stove head 2 and the installation shell 9 with the power incoming line terminal of the electric control unit to achieve protective grounding.

[0068] Specifically, Fig.11 and Fig.12 As shown, the negative electrode mounting seat 911 of the plasma stove 100 of the present invention is provided with a mounting hole 912, and the lower end of the support rod 10 is inserted into the mounting hole 912 of the negative electrode mounting seat 911 to fit tightly.

[0069] like Fig.13 and Fig.14 As shown, the annular negative electrode is radially provided with a connection hole 81, and a nut 101 is provided at the top end of the support rod 10, and the nut 101 is accommodated in the connection hole 81 of the annular negative electrode and connected by a screw 82. That is, the lower end of the support rod 10 of the present invention is inserted into the mounting hole 912 of the negative electrode mounting seat 911 of the upper cover 91, and the upper end is accommodated in the connection hole 81 of the annular negative electrode through the nut 101 and fixed to the bottom surface of the annular negative electrode through the screw 82.

[0070] Preferably, if Fig.15 As shown, the stove head 2 of the plasma stove 100 of the present invention further includes a liftable grounding device 12 disposed above the mounting shell 9, the liftable grounding device 12 protrudes upward and is provided with an elastically liftable extension end 121 for elastically contacting the bottom of the pot 200, and the extension end 121 is electrically grounded. The extension end 121 is electrically grounded so that the extension end 121 is finally connected to the earth and the potential is zero.

[0071] For safety reasons, in the prior art, when the pot 200 is completely separated from the plasma stove, the fire must be turned off immediately. Because in the prior art, once the pot 200 leaves the stove head 2, the pot 200 is no longer grounded. If the fire is not turned off, the discharge electrode 4 may discharge toward the bottom of the pot 200 that has left the stove head 2, making the pot 200 charged and prone to electric shock accidents. As a result, in the prior art, users cannot "flip the pot" (referring to the cooking action of lifting the pot, leaving the stove, and repeatedly shaking it to fully heat the food) when cooking.

[0072] The plasma stove 100 of the present invention is provided with a liftable grounding device 12, whose extension end 121 can be lifted and lowered and elastically contacted with the bottom of the pot 200, so that within the extension range of the extension end 121, even if the pot 200 is lifted off the stove head 2, because the pot bottom is still in contact with the extension end 121, and the extension end 121 is grounded, the pot 200 is still grounded without safety hazards. Again, even if the pot 200 is lifted off at a height higher than the highest extension height of the extension end 121, at this time, because the pot bottom of the pot 200 is far enough from the discharge electrode 4, the discharge electrode 4 will no longer discharge toward the pot bottom, and the pot 200 is safe at this time, so that the user can "turn the pot" when cooking without safety hazards. The highest extension height of the extension end 121 can be designed through experiments, such as the height of the highest extension height of the extension end 121 from the plane of the discharge electrode 4 is greater than or equal to 50mm.

[0073] At the same time, due to the safety function of the liftable grounding device 12, after the pot 200 leaves the stove head 2, the plasma stove 100 of the present invention does not need to be turned off immediately, avoiding the defect in the prior art that if the pot needs to be "turned over", the stove needs to be turned off and on again to ensure safety, resulting in discontinuous heat and affecting cooking.

[0074] It is understood that the base 1 of the plasma stove 100 of the present invention may also be provided with a cooling fan and an air inlet and an air outlet for the cooling fan to take in and out air, so that the heat generated by the transformer circuit unit 6 can be quickly blown out of the base 1 to ensure the heat dissipation effect of the whole machine.

[0075] The plasma stove 100 with increased heating area proposed in the embodiment of the present invention is characterized in that a negative electrode 8 is arranged on the electrode mounting plate 5 in the stove head 2, and the discharge electrodes 4 are arranged inside and outside the negative electrode 8. The discharge tip 421 of each discharge electrode 4 is inclined with respect to the plane of the bottom surface of the pot 200 and discharges toward the negative electrode 8. In this way, the thermal plasma beam between the discharge electrode 4 and the negative electrode 8 is not directly directed toward the bottom of the pot with the top end, but is in line contact with the bottom of the pot with the side of the thermal plasma beam. Compared with the point contact in the prior art, the contact area between the thermal plasma beam and the bottom surface of the pot is greatly increased, thereby increasing the heating area of ​​the bottom surface of the pot 200 and improving the heating efficiency of the plasma stove 100.

[0076] The above description is only an example to clearly illustrate the present invention, and does not limit the patent scope of the present invention. It is impossible to list all the implementation methods here. All equivalent structural changes made by using the contents of the technical solution of the present invention under the concept of the present invention, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A plasma stove with an increased heating area, comprising a base, a stove head disposed on the base, and an electric control unit disposed on the base, wherein the stove head comprises a plurality of discharge electrodes exposed from above the base, and an electrode mounting plate disposed in the base for mounting the discharge electrodes, and a voltage transformer circuit unit disposed in the base, wherein the voltage transformer circuit unit is electrically connected to the electric control unit and the discharge electrodes; It is characterized in that The electrode mounting plate is also provided with at least one negative electrode; The plurality of discharge electrodes are respectively arranged on the inner side and the outer side of the negative electrode; The discharge electrode is provided with a discharge tip, which is inclined with the bottom surface of the cookware and discharges toward the negative electrode. The thermal plasma beam generated by ionization between the discharge tip and the negative electrode is in line contact with the bottom surface of the cookware.

2. The plasma stove with increased heating area according to claim 1, characterized in that: The negative electrode is a ring-shaped negative electrode arranged in the middle of the upper end surface of the electrode mounting plate; The plurality of discharge electrodes are arranged in an annular arrangement on the inner and outer rings of the annular negative electrode.

3. The plasma stove with increased heating area according to claim 1, characterized in that: The distance between the discharge tip and the negative electrode is smaller than the distance between the discharge tip and the bottom of the pot; and / or, The height from the discharge tip to the electrode mounting plate is less than or equal to the height from the top surface of the negative electrode to the electrode mounting plate.

4. The plasma stove with increased heating area according to claim 1, characterized in that: The discharge electrode comprises a vertically arranged mounting rod and a discharge nozzle arranged at the upper end of the mounting rod, the end of the discharge nozzle is the discharge tip, the lower end of the mounting rod is fixed to the electrode mounting plate, and the discharge nozzle is arranged at an angle with the mounting rod.

5. The plasma stove with increased heating area according to claim 4, characterized in that: A mounting handle is provided at the lower end of the mounting rod, an abutment step is provided at the upper end of the mounting handle, a mounting screw hole is provided at the bottom of the mounting handle, the mounting handle passes through the electrode mounting plate from the upper end surface of the electrode mounting plate, and is fixed to the electrode mounting plate by a locking screw at the lower end surface of the electrode mounting plate.

6. The plasma stove with increased heating area according to claim 2, characterized in that: The stove head also includes a mounting shell arranged below the electrode mounting plate, the mounting shell includes an upper cover and a lower cover, the transformer circuit unit is arranged in a cavity between the upper cover and the lower cover, and the upper cover is connected to the electrode mounting plate; The upper end surface of the upper cover is also provided with a negative electrode mounting seat, and a support rod penetrating the electrode mounting plate is connected between the negative electrode mounting seat and the bottom of the annular negative electrode.

7. The plasma stove with increased heating area according to claim 6, characterized in that: The negative electrode mounting seat is provided with a mounting hole, and the lower end of the support rod is inserted into the mounting hole of the negative electrode mounting seat to fit tightly; The annular negative electrode is radially provided with a connection hole, and the top end of the support rod is provided with a nut, which is accommodated in the connection hole of the annular negative electrode and connected by a screw.

8. The plasma stove with increased heating area according to claim 6, characterized in that: A ceramic protective sleeve is also sleeved outside the support rod between the annular negative electrode and the electrode mounting plate.

9. The plasma stove with increased heating area according to claim 6, characterized in that: The upper end surface of the upper cover is also provided with a wiring groove connected to the negative electrode mounting seat, and the wiring groove is used to lay the negative electrode connection line to electrically connect the support rod and the electronic control unit; The periphery of the negative electrode mounting seat and both sides of the wiring groove are also provided with electric-blocking grooves, and electric-blocking insulating glue is provided in the wiring groove and the electric-blocking groove.

10. The plasma stove with increased heating area according to claim 6, characterized in that: The stove head also includes a liftable grounding device arranged above the mounting shell, the liftable grounding device protrudes upward and is provided with an elastically liftable extension end for elastically contacting the bottom of the cookware, and the extension end is electrically grounded.

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