CN111810995B - A safe plasma stove - Google Patents

Abstract

The invention discloses a safe plasma stove which comprises a base, a stove head and an electric control unit, wherein a plurality of discharge electrodes are arranged in the stove head, a transformation circuit unit is further arranged in the base and electrically connected with the electric control unit and the discharge electrodes, the electric control unit is provided with a grounding detection circuit and a total electric quantity leakage detection circuit, the grounding detection circuit is used for detecting whether all protection grounding points of the plasma stove are effectively grounded or not, the total electric quantity leakage detection circuit is used for detecting the difference between inflow and outflow currents of positive and negative poles of the electric control unit to judge whether the plasma stove leaks electricity or not, the grounding detection circuit is electrically connected with a protection grounding wire in a three-wire plug, a lifting grounding device is further arranged in the stove head, and an extending end capable of being lifted elastically is arranged in the lifting grounding device and is used for being contacted with the bottom of a pot in an elastic mode. The invention enables the plasma kitchen to safely perform pot-turning operation, and has multiple protections of grounding detection and leakage detection.

Description

Safe type plasma kitchen

Technical Field

The invention relates to the technical field of stoves, in particular to a safe plasma stove.

Background

Plasma (plasma) is also called plasma, and is an ionized gaseous substance composed of positive and negative ions generated after ionization of atoms and atomic groups of which partial electrons are deprived, macroscopic electrically neutral ionized gas with a dimension larger than debye length, and the movement of the macroscopic electrically neutral ionized gas is mainly governed by electromagnetic force and shows remarkable collective behavior. The plasma is a good conductor, and can be captured, moved and accelerated by means of a magnetic field which is skillfully designed. The development of plasma physics provides new techniques and processes for the further development of materials, energy, information, environmental space, spatial physics, geophysics, etc. science. The plasma is a fourth state of matter other than solids, liquids, and gases. A substance is composed of molecules, which are composed of atoms, which are composed of a positively charged nucleus and negatively charged electrons surrounding it. When heated to a sufficiently high temperature or other reasons, the outer electrons break away from the confinement of the nuclei into free electrons, just as students after class run on the playground to play at will. Electrons leave the nuclei, a process called "ionization". At this point, the material becomes a uniform mass of "paste" of positively charged nuclei and negatively charged electrons, and is therefore known as a plasma, in which the total amount of positive and negative charges is equal, and is thus approximately electrically neutral, and is therefore known as a plasma.

The plasma kitchen range is a novel kitchen range which utilizes the characteristic of plasma, uses high-voltage electric breakdown air to form thermal plasma, converts electric energy into heat energy, finally obtains thermal plasma beams with ideal length and function, and generates the thermal plasma beams with flame-like characteristics to heat a cooker for cooking.

Since the plasma cooker uses electric energy as direct energy input, in order to generate plasma beams, the commercial power needs to be boosted to about 10KV high voltage, and under such high working voltage, how to ensure the safety of the electricity consumption of a user and prevent electric shock accidents is very important.

The plasma stoves on the market at present have the following defects:

1. For safety, currently, when a user cooks with a plasma oven, the user cannot perform pot-turning operation (the term "pot-turning" refers to the cooking action of lifting the pot, leaving the oven and repeatedly bumping the cooked food to be heated fully). Because in the prior art, once the cooker is lifted off the cooking range, the cooker is not effectively grounded, and thus, if the discharge electrode discharges towards the bottom of the cooker, the cooker is electrified and is easy to cause electric shock to a human body. Therefore, when the plasma kitchen range and the cooker are completely separated from the kitchen range, the current plasma kitchen range simply and roughly adopts a method of immediately and directly turning off fire to prevent electric shock, but the design ensures that the circuit controls to cut off the power supply immediately to turn off fire every time the cooker is lifted off the kitchen range, and then the cooker is put back to be turned on again to control the firing, so that the repeated turning off fire is turned on, the heat supply of the bottom of the cooker is discontinuous, and the subversion cooking operation of the current plasma kitchen range cannot be normally performed.

2. The prior plasma kitchen range simply carries out grounding arrangement on a kitchen range shell, but does not detect whether the whole circuit, particularly the power supply part of an external power supply, is effectively grounded. In some old communities/rural areas, when many residential houses are connected to the home, the installation of the grounding wire is not strictly performed according to the national standard, so that even if the metal exposed part of the product is grounded by the circuit part in the existing plasma kitchen product, the effect of grounding protection cannot be achieved if the plasma kitchen product is used in the old communities without the grounding wire, and potential safety hazards exist.

3. The existing plasma kitchen is only connected with a leakage switch at the position of an inlet line, and no leakage detection is performed on an internal circuit of the kitchen range, so that potential safety hazards exist.

Accordingly, there is a need in the art for improvement.

Disclosure of Invention

In view of the above-described shortcomings of the prior art, an object of the present invention is to provide a safe type plasma oven, which aims to enable the safe operation of a pot turning operation of the plasma oven, and has multiple protections of ground detection and leakage detection.

In order to achieve the above purpose, the invention adopts the following technical scheme:

The safe plasma stove comprises a base, a stove head arranged on the base and an electric control unit arranged in the base, wherein a plurality of discharge electrodes exposed above the base are arranged in the stove head, a voltage transformation circuit unit is further arranged in the base and is electrically connected with the electric control unit and the discharge electrodes, a wire connected with the electric control unit and used for being externally connected with a power supply is arranged outside the base in an extending mode, and the base and a shell of the stove head are grounded in a protecting mode;

The electric control unit is provided with a grounding detection circuit and a total electric quantity leakage detection circuit, the grounding detection circuit is used for detecting whether all protection grounding points of the plasma stove are effectively grounded, and the total electric quantity leakage detection circuit is used for detecting the difference between the inflow current and the outflow current of the positive electrode and the negative electrode of the electric control unit so as to judge whether the plasma stove leaks electricity or not;

the wire is a fire zero-earth three-wire, a three-wire plug is arranged on the wire, and the grounding detection circuit is electrically connected with a protection grounding wire in the three-wire plug;

the kitchen range is characterized in that a lifting grounding device is further arranged in the kitchen range, an extending end capable of being lifted elastically is arranged in a protruding mode upwards and used for being in elastic contact with the bottom of the cooker, and the extending end is electrically grounded and electrically connected with a grounding detection circuit.

And the lead is also provided with a leakage protection switch which is connected with the three-wire plug and the electric control unit.

The lifting grounding device is further provided with a highest-position switch circuit for detecting the highest position of the extending end, and the highest-position switch circuit is electrically connected with the electric control unit.

The electric control unit comprises a main control circuit and a power supply circuit electrically connected with the main control circuit, and the output end of the power supply circuit is electrically connected with the input end of the transformation circuit unit;

the grounding detection circuit and the total electric quantity leakage detection circuit are electrically connected with the main control circuit.

The cooking range also comprises a mounting shell for mounting the voltage transformation circuit unit, wherein the mounting shell comprises an upper shell and a lower shell, the upper shell is provided with a grounding device mounting cavity, and a grounding connecting wire is arranged in the grounding device mounting cavity;

The lifting grounding device comprises a base body, a sleeve arranged in the base body, a spring arranged in the sleeve and in butt joint with the sleeve and the base, and a lifting rod sleeved in the spring, wherein the upper end of the lifting rod penetrates out of the sleeve for a stretching end, and the base body is fixed in a grounding device mounting cavity of an upper shell and is connected with a grounding connecting wire.

Wherein, the part of the upper end of the sleeve, which is exposed out of the upper shell, is also sleeved with a ceramic protection tube;

The sleeve top is also provided with a guide nozzle, and the upper end of the lifting rod is arranged on the guide nozzle in a penetrating way.

The upper surface of the upper shell is provided with a first wire slot communicated with the grounding device mounting cavity and used for arranging a grounding connecting wire connected with the lifting grounding device in a grounding mode, first power-resisting grooves are further formed in two sides of the first wire slot and the periphery of the grounding device mounting cavity, and insulating glue for power resistance is filled in the first wire slot and the first power-resisting grooves.

The cooking range further comprises a high-temperature-resistant insulating plate positioned above the installation shell, and the high-temperature-resistant insulating plate is used for installing the discharge electrodes.

Wherein, a negative electrode for forming a discharge loop with a plurality of discharge electrodes is also arranged above the high-temperature-resistant insulating plate;

the upper surface of epitheca still is provided with negative pole support installation cavity and intercommunication the second wire casing of negative pole support installation cavity is used for laying with the negative pole connecting wire that the negative pole is connected, the second electric slot that hinders has still been seted up to the both sides of second wire casing and the periphery of negative pole support installation cavity, second wire casing, second hinder the electric slot intussuseption and fill and hinder the insulating glue that the electricity was used.

And the installation shell is also provided with a temperature sensor which is electrically connected with the electric control unit.

According to the safe plasma stove, the lifting grounding device is arranged in the stove head, so that the protruding end of the lifting grounding device is elastically contacted with the bottom of the cooker, and therefore, when the cooker is operated at the top of the pan, the cooker can still be effectively grounded through the contact with the protruding end even if the cooker is separated from the stove head and is not turned off, and again, when the cooker is separated from the protruding end upwards again, a large enough distance exists between the bottom of the pan and the discharge electrode, so that the discharge electrode can not discharge to the bottom of the pan any more, and safety is ensured. And whether the external commercial power and the kitchen range shell are effectively grounded or not is detected by arranging a three-wire plug and a grounding detection circuit, if the grounding is invalid, the power supply of the circuit is turned off by the electric control unit. Meanwhile, a total electric quantity leakage detection circuit is also arranged to effectively detect whether the cooker has leakage in the electricity utilization process, and if the cooker has the leakage, the power supply is turned off, so that the plasma cooker has multiple protections of grounding detection, leakage detection and lifting grounding devices to ensure the use safety of products, and can safely perform the pot-turning operation without repeatedly turning off and firing.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a first embodiment of a safe plasma oven according to the present invention;

FIG. 2 is an exploded view of the structure of FIG. 1;

FIG. 3 is a schematic cross-sectional view of the structure of FIG. 1;

fig. 4 is a schematic cross-sectional view showing a state that the lifting grounding device of the structure of fig. 1 contacts with the bottom surface of the pot.

Fig. 5 is a schematic circuit diagram of a first embodiment of a safe plasma oven according to the present invention;

FIG. 6 is a schematic view of the mounting housing of the present invention;

FIG. 7 is a schematic diagram of a lifting grounding device according to the present invention;

FIG. 8 is an exploded view of the structure of FIG. 7;

Reference numerals illustrate:

100-plasma cooker, 1-cooker head, 11-cooker support, 12-installation shell, 121-upper shell, 1210-grounding device installation cavity, 1211-first wire slot, 1212-first power-resisting slot, 1213-negative electrode support installation cavity, 1214-second wire slot, 1215-second power-resisting slot, 13-high temperature-resistant insulating board, 14-negative electrode, 122-lower shell, 13-switch button, 14-adjusting knob, 15-temperature sensor, 16-radiator fan, 17-air inlet, 18-air outlet, 191-wire inlet wiring port, 192-ground wire wiring port, 2-base, 21-man-machine interaction panel, 22-switch button, 23-adjusting knob, 3-electric control unit, 31-ground detection circuit, 32-total electric quantity leakage detection circuit, 33-main control circuit, 34-power circuit, 4-discharge electrode, 5-voltage transformation circuit unit, 6-wire, 7-three-wire plug, 7-high temperature-resistant insulating board, 8-liftable grounding device, 81-lifting rod, 811-extension end, 82-ground wire socket, 83-84-spring, 85-ceramic base; 86-a guide nozzle, 87-a first electrode plate, 88-a second electrode plate, 9-a leakage protection switch, 10-a highest switching circuit and 200-a cooker.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear are used in the embodiments of the present invention) are merely for explaining the relative positional relationship, movement conditions, and the like between the components in a certain specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicators are changed accordingly.

In the present invention, unless explicitly specified and limited otherwise, the terms "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be either fixedly connected or detachably connected or integrally formed, may be mechanically connected or electrically connected, may be directly connected or indirectly connected through an intermediate medium, and may be in communication with each other or in an interaction relationship between two elements, unless explicitly specified otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.

Referring to fig. 1 to 5, the present invention proposes a safe plasma oven 100, which includes a base 2, and a cooking range 1 disposed on the base 2, wherein the cooking range 1 may be one or more. And the electric control unit 3 is arranged in the base 2, a plurality of discharge electrodes 4 exposed above the base 2 are arranged in the cooking range 1, the base 2 is internally provided with a transformation circuit unit 5 which is electrically connected with the electric control unit 3 and the discharge electrodes 4, a wire 6 which is connected with the electric control unit 3 and is used for externally connecting a power supply is arranged outside the base 2, and the outer shells of the base 2 and the cooking range 1 are grounded in a protecting mode. The cooking top 1 further comprises a cooker support 11 arranged on the base 1 and used for supporting the cooker 200. The pan 200 may be made of metal pan or ceramic pan. The lead 6 is used for connecting an external commercial power source, namely 220V alternating current power source. The protection grounding mode of the base 2 and the shell of the cooking range 1 can be that a unified protection grounding point (protection grounding terminal) is arranged inside the plasma kitchen range, then the protection grounding terminal is connected with the shell of each metal part of the plasma kitchen range such as the base 2, the cooking range 1 and the like through a circuit line, and meanwhile, the protection grounding terminal is connected with the ground wire in the lead 6 so as to be connected with the protection grounding wire (PE) in an external commercial power grid.

The electric control unit 3 is used for generating a driving power supply required by the transformation circuit unit 5 and controlling the transformation circuit unit 5 to turn on and off and output power. The driving power supply generated by the electric control unit 3 is a low-voltage power supply with high frequency or low frequency, the transformation circuit unit 5 converts the low voltage power input by the electric control unit 3 into high voltage power and outputs the high voltage power to the discharge electrode 4 for discharging, and the electric arc generated by the discharge electrode 4 ionizes air to generate high-temperature plasma to heat the bottom of the pot. In the embodiment of the invention, the electric control unit 3 and the voltage transformation circuit unit 5 are arranged in the base 2 in an isolated manner.

The discharge electrode 4 of the plasma cooker 100 is a positive electrode, when the cooker 200 is a metal cooker, the metal cooker can be directly used as a negative electrode to form a discharge loop, and when the cooker is a ceramic cooker, the negative electrode is also required to be arranged in the cooker 1 independently.

As shown in fig. 5, the electric control unit 3 of the plasma oven 100 of the present invention is provided with a ground detection circuit 31 and a total power leakage detection circuit 32, wherein the ground detection circuit 31 detects whether all the protection ground points of the plasma oven 100 are effectively grounded, and the total power leakage detection circuit 32 is used for detecting the difference between the inflow and outflow currents of the positive and negative electrodes of the electric control unit 3 to determine whether the plasma oven 100 is leaked.

The wire 6 is a fire zero-earth three-wire, the wire 6 is provided with a three-wire plug 7, and the ground detection circuit 31 is electrically connected with a protection ground wire in the three-wire plug 7. The fire zero-earth three-wire is provided with a fire wire, a zero wire and a ground wire.

Because of the combination of the three-wire plug 7 and the grounding detection circuit 31, when a user connects a household wire of a commercial power supply at home, if the household wire is not connected with a protective grounding wire (PE) of the commercial power supply grid, after the three-wire plug 7 of the plasma stove 100 is plugged into a socket, the grounding detection circuit 31 sends a detection signal to the protective grounding wire in the wire 6, and when the fact that effective grounding is not achieved (such as detection through feedback voltage or feedback current) is detected, the electric control unit 3 is turned off to output electric energy to the outside, so that the plasma stove 100 cannot be used. Thus, in some old cells or rural areas where the protection ground wire is not installed, the plasma cooker 100 of the present invention can perform effective ground detection to perform protection.

Meanwhile, the ground detection circuit 31 of the invention can also perform effective ground detection on the outer shell of the metal component of the plasma kitchen range 100, such as the base 2, the kitchen range 1 and the like, and the pan 200 placed on the kitchen range 1, if the ground is not effectively grounded, the electric control unit 3 is also closed to output electric energy to the outside so as to inhibit the use of the plasma kitchen range 100. This can prevent electric shock caused by ground failure.

The total power leakage detection circuit 32 of the plasma stove 100 of the present invention detects the magnitude of the current flowing out of the "positive electrode" of the electric control unit 3, including the sum of the currents flowing out to the voltage transformation circuit unit 5 and then to all the discharge electrodes, and also detects the magnitude of the current flowing in of the "negative electrode", such as the sum of the currents of the negative electrode loop current conducted with the discharge electrodes, the grounding devices, etc., and judges that if the sum of the currents flowing in of the negative electrode and the grounding devices is smaller than the current flowing out of the positive electrode, it indicates that there is a leakage, the electric control unit 3 will immediately cut off the power. And prevent electric shock accidents caused by electric leakage.

As shown in fig. 3 and 4, a lifting grounding device 8 is further disposed in the cooking range 1 of the plasma cooking range 100 according to the present invention, an elastically lifting protruding end 811 is disposed protruding upward from the lifting grounding device 8 for elastically contacting with the bottom of the pot, and the protruding end 811 is electrically grounded and electrically connected to the ground detection circuit 31. The electrical grounding of the protruding end 811 may be connected to the ground through the grounding point of the circuit board on the electronic control unit 3, or directly connected to the ground through the internal protective grounding terminal of the plasma oven connected to the protective grounding line PE, so that the electric potential is zero.

The protruding end 811 of the liftable grounding device 8 is liftable and elastically contacts the bottom of the pot 200, so that in the protruding range of the protruding end 811, even if the pot 200 is lifted away from the pot holder 11, because the bottom of the pot is still in contact with the protruding end 811, the protruding end 811 is protectively grounded, so that the pot 200 is still grounded without safety hazard, and if the protruding end 811 is not effectively grounded, the ground detection circuit 31 will act to turn off the power supply. Again, even if the pan 200 is lifted to the highest protruding height out of the protruding end 101, the discharge electrode 5 will not discharge toward the bottom of the pan because the bottom of the pan 200 is far enough away from the discharge electrode 5, and the pan 200 is safe, so that the user can "turn the pan" during cooking without potential safety hazard. The highest protruding height of the protruding end 811 may be designed by experiments, such as a height of 50mm or more from the plane of the discharge electrode 5 of the highest protruding height of the protruding end 811, or a distance of 3 times or more from the discharge electrode 5 to the bottom of the pot or from the negative electrode of the highest protruding height of the protruding end 811.

Meanwhile, due to the safety function of the lifting grounding device 8, after the cooker 200 leaves the cooker support 11, the plasma cooker 100 does not need to be turned off immediately, so that the defects that in the prior art, if a pot is required to be turned over, the cooker needs to be turned on repeatedly to ensure safety, heat is discontinuous and cooking is influenced are avoided.

Namely, the lifting grounding device 8 of the invention can ensure that the plasma stove 100 of the invention can safely and normally operate with a top pan without repeatedly switching on and off fire.

Thus, the plasma oven 100 of the present invention has multiple protections of ground detection, leakage detection, lifting and lowering ground devices to ensure the safety of the product.

As shown in fig. 5, the electric control unit 3 according to the embodiment of the present invention includes a main control circuit 33, a power supply circuit 34 electrically connected to the main control circuit 33, an output end of the power supply circuit 34 electrically connected to an input end of the transformer circuit unit 5, and the ground detection circuit 31 and the total power leakage detection circuit 32 electrically connected to the main control circuit 33.

The main control circuit 33 can be controlled by a single chip microcomputer combined program, the main control circuit 33 controls the output of the voltage transformation circuit unit 5, and the power supply circuit 34 provides driving current for the voltage transformation circuit unit 5. The power supply circuit 34 is connected to an external commercial power through a wire 5 and a three-wire plug 6.

In the embodiment of the present invention, the base 2 is further provided with a man-machine interaction panel 21 for controlling the plasma oven 100. The human-machine interaction panel 21 may be provided as a key or a touch screen. The base 2 is also provided with a switch button 22 and an adjusting knob 23 for switching the plasma oven 100 on and off and adjusting the output power. The man-machine interaction panel 21, the switch key 22 and the adjusting knob 23 are all electrically connected with the main control circuit 33.

Further, as shown in fig. 1, a leakage protection switch 9 is further disposed on the wire 6 in the embodiment of the present invention to connect the three-wire plug 7 and the electronic control unit 3. The arrangement of the leakage protection switch 9 can be matched with the total electric quantity leakage detection circuit 32 to play a role of double leakage protection. Meanwhile, the leakage protection switch 9 also has short circuit and overload protection so as to ensure the use safety of the plasma kitchen range 100.

Further, as shown in fig. 5, the lifting grounding device 8 of the present invention is further provided with a highest level switch circuit 10 for detecting the highest position of the protruding end 811, and is electrically connected to the electronic control unit 3. The highest level switch circuit 10 is used to detect whether the protruding end 811 is at the highest position, and if the protruding end 811 is at the highest position, it indicates that the pan 200 has been separated from the cooking range 1. The highest level switch circuit 10 sends the detection information to the electric control unit 3, the electric control unit 3 can time the time when the cooker 200 is separated from the cooking range 1, and when the separation time reaches the preset time, for example, 20s, the power supply is turned off to turn off fire, so that accidents caused by forgetting to turn off fire of a user are prevented.

Specifically, as shown in fig. 6 to 8, the cooking range 1 of the plasma cooking range 100 of the present invention further includes a mounting housing 12 for mounting the voltage transformation circuit unit 5, the mounting housing 12 includes an upper case 121 and a lower case 122, the upper case 121 is provided with a grounding device mounting cavity 1210, and a grounding connection line (not shown) is provided in the grounding device mounting cavity 1210. The grounding device mounting cavity 1210 is used for mounting the liftable grounding device 8. The installation shell 12 protects the voltage transformation circuit unit 5, and can support the lifting grounding device 8, the pot support 11, the discharge electrode 4 and the like on the cooking range 1. Preferably, the mounting housing 12 is further provided with a temperature sensor 15 electrically connected to the electronic control unit 3. The temperature sensor 15 can detect the temperature of the installation shell 12, which is generated by the voltage transformation circuit unit 5 or generated by the plasma beam, and when the actual temperature of the installation shell 12 exceeds the preset temperature in the working process, the power supply of the voltage transformation circuit unit 5 is cut off, so that the voltage transformation circuit unit 5 stops outputting electric energy to the discharge electrode to stop the discharge work, and the use safety is ensured.

Preferably, as shown in fig. 2, the base 2 of the embodiment of the present invention is further provided with a cooling fan 16 facing the side wall of the installation housing 12, and an air inlet 17 and an air outlet 18 for air inlet and outlet of the cooling fan 16. Therefore, heat generated by the voltage transformation circuit unit 5 can be quickly blown out of the base 2, and the heat dissipation effect of the whole machine is ensured.

As shown in fig. 6, the mounting housing 12 is also provided with an incoming wiring port 191 and a ground wiring port 192. The incoming line connection port 191 is used to connect the transformer circuit unit 5 with the power supply circuit 34. The ground connection port 192 is used to protect the metal housing from ground. For insulation between the discharge electrodes 4 and insulation of the connection lines between the discharge electrodes 4 and the transformation circuit unit 5, it is preferable that the upper case 121 of the embodiment of the present invention adopts a plastic-type insulation material.

The lifting grounding device 8 comprises a base 82, a sleeve 83 arranged in the base 82, a spring 84 arranged in the sleeve 83 and abutting against the sleeve 83 and the base 82, and a lifting rod 81 sleeved in the spring 84, wherein the upper end of the lifting rod 81 penetrates out of the sleeve 83 as an extending end 811, and the base 82 is fixed in a grounding device mounting cavity 1210 of the upper shell 121 and is connected with the grounding connecting line. The lifting rod 81 is lifted up and down by the spring 84 and slides up and down in the sleeve 83. Meanwhile, since the lifting rod 81 is sleeved in the spring 84, the spring 84 is abutted on the base 82, the base 82 is connected with the grounding connecting line to realize grounding, so that the spring 84, the lifting rod 81 and the sleeve 83 are all electrically grounded, the pot 200 is grounded when being placed on the pot bracket 11 and contacted with the extending end 811 of the lifting rod 81, and the lifting rod 81 is elastically lifted in the lowest position and the highest position range arranged in the sleeve 83, so that the pot 200 is elastically contacted with the extending end 811 of the lifting rod 81 when lifted in the lowest position and the highest position range, and the pot 200 can be effectively grounded when the pot turning operation is performed in the lowest position and the highest position range, thereby ensuring the safety of a pot turning operator.

Preferably, as shown in fig. 8, a part of the upper end of the sleeve 83 exposed out of the upper shell 121 is further sleeved with a ceramic protection tube 85, and the ceramic protection tube 85 is sleeved outside the sleeve 83, so that abnormal discharge of the product caused by discharging of the discharge electrode 4 on the upper shell 121 to the metal and the wires in the lifting grounding device 8 is prevented.

The top end of the sleeve 83 of the embodiment of the invention is also provided with a guide nozzle 86, and the upper end of the lifting rod 81 is penetrated through the guide nozzle 86. The extending end 811 of the lifting rod 81 is penetrated and exposed out of the guide nozzle 86, and the guide nozzle 86 is used for guiding the lifting rod 81, so as to prevent the lifting rod 81 from shaking left and right in the lifting process to influence the contact with the bottom of the pot. Preferably, the guide nozzle 86 is made of an insulating material such as ceramic or plastic.

Specifically, the highest level switch circuit 10 of the embodiment of the present invention includes a first electrode piece 87 fixed at the top end inside the sleeve 83 and a second electrode piece 88 fixed at the bottom of the lifting rod 81, the second electrode piece 88 moves upward along with the lifting rod 81 until the protruding end 811 protrudes upward to reach the highest position, the second electrode piece 88 contacts the first electrode piece 87, at this time, the highest level switch circuit 10 is turned on and sends a signal to the main control circuit 33, and the main control circuit 33 starts to count the time when the pot 200 is separated from the protruding end 811 to determine whether fire is to be turned off.

With continued reference to fig. 6, further, a first wire groove 1211 communicating with the grounding device mounting cavity 1210 is provided on the upper surface of the upper casing 121 of the plasma stove 100 of the present invention, for arranging a grounding connection wire connected to the grounding device 8, and first resistor grooves 1212 are respectively provided on both sides of the first wire groove 1211 and on the periphery of the grounding device mounting cavity 1210, and insulating glue for resistor is filled in the first wire groove 1211 and the first resistor grooves 1212. The first wire groove 1211 is used for leading out the ground wire of the liftable ground device. When the transformer circuit unit 5 is connected to the plurality of discharge electrodes 4, a plurality of wires are required to be disposed above the upper case 121 and connected to the bottom of the discharge electrodes 4, and the wires and the discharge electrodes 4 are powered with positive polarity, and the grounding connection wires with negative polarity are disposed in the first wire slot 1211, so that the discharge electrodes 4 are easily discharged to the ground wire in the first wire slot 1211, so that a layer of first resistive slot 1212 is disposed on both sides of the first wire slot 1211 and at the periphery of the grounding device mounting cavity 1210, and insulating glue is disposed in the first wire slot 1211 and the first resistive slot 1212 to prevent abnormal discharge, thereby avoiding influencing normal use of the product due to abnormal discharge.

With continued reference to fig. 3, the burner 1 of the plasma oven 100 of the present invention preferably further includes a high temperature resistant insulating plate 13 located above the mounting case 12, the high temperature resistant insulating plate 13 mounting the plurality of discharge electrodes 4.

In the embodiment of the invention, the upper shell 121 of the installation shell 12 supports the high temperature resistant insulating plate 13 and the cooker support 11. The high temperature resistant insulating plate 13 can prevent heat loss of the pan bottom on one hand, and can prevent heat from flowing downwards to the installation shell 12 to prevent the installation shell 12 from being excessively high in temperature to influence the transformer circuit unit 5 therein. Meanwhile, the high temperature resistant insulating plate 13 is also used for mounting and supporting the plurality of discharge electrodes 4.

Preferably, a negative electrode 14 for forming a discharge circuit with the plurality of discharge electrodes 4 is further provided above the high temperature resistant insulating plate 13 of the present invention.

The negative electrode 14 is separately arranged in the embodiment of the invention, so that the cooker 200 is not used as a part of an electric loop in the use process, the method that the plasma beam of the existing plasma cooker 100 is generated between the discharge electrode and the cooker is changed, and the plasma beam is generated between the discharge electrode and the negative electrode, thereby realizing that both metal and nonmetal cookers can be used on the plasma cooker 100, and simultaneously avoiding the problems that when the cooker is used as the negative electrode, the cooker breaks down due to direct impact of plasma on the bottom of the cooker under the long-time action and the service life of the cooker is influenced.

Further, referring to fig. 6, the upper surface of the upper case 121 of the embodiment of the present invention is further provided with a negative electrode support mounting cavity 1213 and a second wire slot 1214 that communicates with the negative electrode support mounting cavity 1213, and is used for laying a negative electrode connecting wire (not shown) connected with the negative electrode 14, two sides of the second wire slot 1214 and a periphery of the negative electrode support mounting cavity 1213 are further provided with a second power blocking slot 1215, and insulating glue for power blocking is filled in the second wire slot 1214 and the second power blocking slot 1215. The negative electrode holder mounting cavity 1213 is used to house a mounting seat for supporting the negative electrode 14. The negative electrode connecting wire is connected with the power ground of the electric control unit 3.

The second wire groove 1214 is used to draw out the negative electrode connection wire of the negative electrode 14. Similarly, since the plurality of wires and the discharge electrode 4 are disposed above the upper case 121, and the wires and the discharge electrode 4 are electrified with positive polarity, the negative electrode connection wire with negative polarity is disposed in the second wire slot 1214, so that the discharge electrode 4 is easily caused to discharge to the negative electrode connection wire in the second wire slot 1214, so that a layer of second electric blocking grooves 1215 are further disposed at both sides of the second wire slot 1214 and at the periphery of the negative electrode support mounting cavity 1213, and insulating glue is disposed in the second wire slot 1214 and the second electric blocking grooves 1215 to prevent discharge, thereby avoiding influencing normal use of the product due to abnormal discharge.

According to the safe plasma cooker 100 provided by the embodiment of the invention, the lifting grounding device 8 is arranged in the cooking range 1, so that the extending end 811 of the lifting grounding device 8 is elastically contacted with the bottom of the cooker 200, and therefore, when the cooker 200 is separated from the cooking range and is not turned off during pot tilting operation, the cooker 200 can still be effectively grounded through the contact with the extending end, and again, when the cooker 200 is separated from the extending end upwards again, a large enough distance exists between the bottom of the cooker and the discharge electrode, so that the discharge electrode can not discharge to the bottom of the cooker any more, and the safety is ensured. The invention also detects whether the external mains supply and the kitchen range shell are effectively grounded or not by arranging the three-wire plug 6 and the grounding detection circuit 31. Meanwhile, a total electric quantity leakage detection circuit 32 is also arranged to effectively detect whether the kitchen range has leakage in the electricity utilization process. Thus, the plasma cooker 100 of the invention has multiple protections of grounding detection, leakage detection and lifting grounding devices to ensure the use safety of products, and can safely perform pot tilting operation.

The foregoing is illustrative of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims, rather, as the description of the invention covers all embodiments of the invention.

Claims (9)

1. The safe plasma stove comprises a base, a stove head arranged on the base and an electric control unit arranged in the base, wherein a plurality of discharge electrodes exposed above the base are arranged in the stove head, a voltage transformation circuit unit is further arranged in the base and is electrically connected with the electric control unit and the discharge electrodes, a wire connected with the electric control unit and used for being externally connected with a power supply is arranged outside the base in an extending mode, and the base and a shell of the stove head are grounded in a protecting mode;

It is characterized in that the method comprises the steps of,

The electric control unit is provided with a grounding detection circuit and a total electric quantity leakage detection circuit, the grounding detection circuit is used for detecting whether all protection grounding points of the plasma stove are effectively grounded, and the total electric quantity leakage detection circuit is used for detecting the difference between the inflow current and the outflow current of the positive electrode and the negative electrode of the electric control unit so as to judge whether the plasma stove leaks electricity or not;

the wire is a fire zero-earth three-wire, a three-wire plug is arranged on the wire, and the grounding detection circuit is electrically connected with a protection grounding wire in the three-wire plug;

The lifting grounding device is also arranged in the cooking range, an extending end capable of elastically lifting is arranged in an upward protruding mode of the lifting grounding device and is used for elastically contacting with the bottom of the cooker, and the extending end is electrically grounded and is electrically connected with the grounding detection circuit;

the lifting grounding device is also provided with a highest-position switch circuit for detecting the highest position of the extending end, and the highest-position switch circuit is electrically connected with the electric control unit.

2. The safe plasma oven according to claim 1, wherein a leakage protection switch is further provided on the wire to connect the three-wire plug and the electronic control unit.

3. The safe plasma oven according to claim 1, wherein the electric control unit further comprises a main control circuit, a power supply circuit electrically connected with the main control circuit, and an output end of the power supply circuit is electrically connected with an input end of the voltage transformation circuit unit;

the grounding detection circuit and the total electric quantity leakage detection circuit are electrically connected with the main control circuit.

4. The safe plasma oven according to claim 1, wherein the oven further comprises a mounting housing for mounting the voltage transformation circuit unit, the mounting housing comprising an upper housing and a lower housing, the upper housing being provided with a grounding device mounting cavity, the grounding device mounting cavity being provided with a grounding connection wire therein;

The lifting grounding device comprises a base body, a sleeve arranged in the base body, a spring arranged in the sleeve and in butt joint with the sleeve and the base, and a lifting rod sleeved in the spring, wherein the upper end of the lifting rod penetrates out of the sleeve for a stretching end, and the base body is fixed in a grounding device mounting cavity of an upper shell and is connected with a grounding connecting wire.

5. The safe plasma oven according to claim 4, wherein the part of the upper end of the sleeve, which is exposed out of the upper case, is further sleeved with a ceramic protective tube;

The sleeve top is also provided with a guide nozzle, and the upper end of the lifting rod is arranged on the guide nozzle in a penetrating way.

6. The safe plasma oven according to claim 4, wherein a first wire slot is formed in the upper surface of the upper case and is communicated with the grounding device mounting cavity, a grounding connecting wire connected with the lifting grounding device in a grounding mode is arranged on the upper surface of the upper case, first power blocking grooves are formed in two sides of the first wire slot and the periphery of the grounding device mounting cavity, and insulating glue for power blocking is filled in the first wire slot and the first power blocking grooves.

7. The safety type plasma cooking range according to claim 4, wherein the cooking range further comprises a high temperature resistant insulating plate positioned above the mounting case, the high temperature resistant insulating plate mounting the plurality of discharge electrodes.

8. The safe plasma oven according to claim 7, wherein a negative electrode for forming a discharge circuit with the plurality of discharge electrodes is further provided above the high temperature resistant insulating plate;

the upper surface of epitheca still is provided with negative pole support installation cavity and intercommunication the second wire casing of negative pole support installation cavity is used for laying with the negative pole connecting wire that the negative pole is connected, the second electric slot that hinders has still been seted up to the both sides of second wire casing and the periphery of negative pole support installation cavity, second wire casing, second hinder the electric slot intussuseption and fill and hinder the insulating glue that the electricity was used.

9. The safe plasma oven according to claim 4, wherein a temperature sensor is further provided on the mounting housing to be electrically connected with the electric control unit.