Plasma jet device and electric arc heating device thereof

Abstract

The embodiment of the invention relates to the technical field of heating equipment. The invention provides a plasma jet device and an electric arc heating device thereof. The plasma jet device comprises: a device body forming at least one airflow channel; the hollow pipe body extends along the axis direction; the hollow pipe body is fixed on the device body and is provided with a non-conductive part and a conductive part; the conductive needle is fixed on the device body; the conductive needle is positioned in an internal space defined by the non-conductive part of the hollow tube body; at least one notch is formed in the pipe wall of the non-conductive part of the hollow pipe body, so that the hollow pipe body is communicated with the airflow channel; the conductive needle is an anode, the conductive part of the hollow tube body is a cathode, and an arc discharge path is formed between the two. Stable rotating airflow can be built in the hollow pipe body and used for generating plasma working medium jet flow, the heating efficiency is improved, and reliable and stable operation of the device is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heating equipment, in particular to a plasma jet device and an arc heating device thereof. BACKGROUND

[0002] Arc stove is a new type of cooking heating device using plasma flame technology, which generates high-temperature plasma to heat cookware or food. It has been widely promoted and applied due to its faster heating speed, higher energy efficiency, and higher environmental friendliness and safety.

[0003] The working principle of arc stove is mainly that the electric arc formed by high-voltage electricity generates high-temperature plasma in the air, and then the heat of the high-temperature plasma is released through the heating nozzle, so as to rapidly heat the cookware and achieve the effect of heating food.

[0004] Some arc stoves use ion needles and conical fire tubes to generate electric arcs to generate plasma, and form plasma jets moving towards the cookware by applying air power, so as to transfer heat to the cookware to improve the heating efficiency.

[0005] However, the current technology of forming plasma jet based on air power still has many defects. For example, the amount of air flow introduced is difficult to be effectively controlled. On the one hand, too much air flow introduced is easy to extinguish the electric arc, thereby damaging the stability of the arc stove. On the other hand, insufficient air flow introduced leads to the problem that not enough heat energy can be effectively transferred from the plasma to the cookware, which reduces the thermal efficiency and causes the heat to be retained inside the arc generating tube, which is easy to damage the arc stove components. SUMMARY

[0006] The embodiments of the present application provide a plasma jet device and an arc heating device thereof, which can solve at least part of the defects of the existing arc stove.

[0007] In a first aspect, the present application provides a plasma jet device. The device comprises: a device body forming at least one air flow channel; a hollow tube body extending along an axial direction; the hollow tube body is fixed on the device body and has a non-conductive part and a conductive part; a conductive needle fixed on the device body; the conductive needle is located in the internal space defined by the non-conductive part of the hollow tube body; wherein the tube wall of the non-conductive part of the hollow tube body is provided with at least one notch to communicate the hollow tube body with the air flow channel; the conductive needle forms an anode, and the conductive part of the hollow tube body forms a cathode, so that the spacing space between the anode and the cathode forms an electric arc discharge path in response to the application of an external voltage.

[0008] Optionally, the non-conductive part of the hollow tube body is a ceramic tube; wherein the ceramic tube has a first ceramic tube end face and a second ceramic tube end face facing away from each other; and the first ceramic tube end face is fixed on the device body.

[0009] Optionally, a projection of the conductive needle in the axial direction does not exceed the second ceramic tube end face, so that the conductive needle is entirely located in the internal space defined by the non-conductive part.

[0010] Optionally, the conductive part of the hollow tube body is a cathode tube; wherein the cathode tube has a first cathode tube end face and a second cathode tube end face facing away from each other; and the second cathode tube end face is rigidly connected with the second ceramic tube end face to form a continuous hollow tube body.

[0011] Optionally, at least a part of the cathode tube protrudes from the device body; and the first cathode tube end face is an end face away from the device body.

[0012] Optionally, the first cathode tube end face is an open end, so that heat of the plasma formed in the hollow tube body is transmitted outward through the first cathode tube end face.

[0013] Optionally, in the axial direction, the inner diameter of the cathode tube gradually decreases; wherein the inner diameter of the second cathode tube end face is greater than the inner diameter of the first cathode tube end face.

[0014] Optionally, the tube wall of the non-conductive part of the hollow tube body is provided with a plurality of notches; wherein the plurality of notches are spaced apart along the circumferential direction of the tube wall.

[0015] Optionally, the notches are inclined notches inclined with respect to the radius of the hollow tube body.

[0016] Optionally, the plurality of inclined notches are arranged in a clockwise or counterclockwise direction, so that an upward air force is generated inside the hollow tube body.

[0017] Optionally, the airflow channel further comprises at least one air inlet; wherein the air inlet is in communication with an external space, so that gas in the external space enters the airflow channel.

[0018] Optionally, the device further comprises an air supply device arranged in the airflow channel; wherein the air supply device is configured to drive the gas in the airflow channel to enter the interior of the hollow tube body.

[0019] Optionally, the hollow tube body, the conductive needle and the air supply device are coaxially arranged and maintained in the same axial direction.

[0020] In a second aspect, the embodiments of the present application provide an arc heating device. The arc heating device comprises the plasma jet device as described above.

[0021] Optionally, the arc heating device further comprises a pressure boosting device connected with the device body of the plasma jet device, configured to boost the gas pressure inside the gas flow channel of the device body.

[0022] At least one advantage of the plasma jet device and the arc heating device of the embodiments of the present application is that it can establish a stable rotating gas flow inside the hollow tube body. When the rotating gas flow acts on the plasma flow, it can accelerate the movement of the plasma generated by the arc and eject it from the opening end, thereby generating a more effective plasma working medium jet, improving the heating efficiency and ensuring the reliable and stable operation of the device. BRIEF DESCRIPTION OF DRAWINGS

[0023] One or more embodiments are illustrated by way of example in the figures that are part of this disclosure and which will better illustrate certain aspects of the present application. The figures in the accompanying drawings are not necessarily to scale, the same reference numerals in different figures represent the same or similar elements unless otherwise specified, and the figures in the drawings are not intended to limit the present application.

[0024] Figure 1 FIG. 1 is a schematic diagram of a plasma jet device according to an embodiment of the present application; Figure 2 FIG. 2 is a schematic diagram of the plasma jet device of FIG. 1 forming a rotating gas flow; Figure 3 FIG. 3 is a schematic diagram of an arc heating device according to an embodiment of the present application; Figure 4 FIG. 4 is a schematic diagram of an arc heating device according to another embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to facilitate the understanding of the present application, the present application will be described in more detail below in conjunction with the drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element or one or more intervening elements can be present therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element or one or more intervening elements can be present therebetween. The terms "upper", "lower", "inner", "outer", "bottom", etc. used in the present specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third", etc. are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. All publications, patent applications, patents, figures, and other references mentioned in this specification are herein incorporated by reference. In case of a conflict in terminology, the present specification controls.

[0027] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0028] Figure 1 A schematic view of a plasma jet device according to an embodiment of the present application. The plasma jet device can generate high-temperature plasma by applying high voltage between an anode and a cathode and emit the plasma from a specific opening end.

[0029] As shown in Figure 1 The plasma jet device includes a device body 10, a hollow tube body 20, and a conductive needle 30.

[0030] The device body 10 is the main structure of the entire plasma jet device. It can be selected to be any suitable type of shape, size, or structure according to the actual needs, which is not specifically limited here.

[0031] In the present embodiment, at least one air flow passage 11 for air flow is formed inside the device body. The air flow passage 11 refers to a structure for guiding and controlling the flow of air or other types of gas. It can also be designed to a specific shape and size according to the actual needs to meet the pre-set design purpose.

[0032] Specifically, the air flow passage 11 can include at least one air inlet 12. The air inlet 12 is in communication with the external space outside the device body, so that the gas located in the external space can continuously enter the air flow passage 11, providing continuous air power for the plasma generated in the hollow tube.

[0033] The hollow tube body 20 is a tubular structure extending along the axial direction. It is fixed on the device body 10, generates plasma in the internal space defined by the tube body, and provides an opening end for the plasma to be discharged.

[0034] In the present embodiment, the hollow tube body 20 has a non-conductive portion 21 and a conductive portion 22. The non-conductive portion 21 refers to a structure portion made of insulating material without conductive performance, while the conductive portion 22 is a structure portion with conductive performance that can be used as an anode or a cathode.

[0035] In addition, at least one notch 23 is formed in the wall of the non-conductive portion 21 of the hollow tube. The notch 23 is a passage allowing gas to pass through, so as to connect the interior of the hollow tube 20 with the gas flow passage 11. The air or gas flowing in the gas flow passage can enter the hollow tube 20.

[0036] Specifically, the non-conductive portion 21 of the hollow tube can be a ceramic tube made of ceramic material. The conductive portion 21 of the hollow tube is a cathode tube made of conductive material.

[0037] The two end faces of the ceramic tube 21 facing away from each other in the axial direction can be referred to as the first ceramic tube end face and the second ceramic tube end face, respectively. Similarly, the two end faces of the cathode tube 22 facing away from each other in the axial direction can be referred to as the first cathode tube end face and the second cathode tube end face, respectively.

[0038] Please continue to refer to Figure 1 The first ceramic tube end face is fixed on the device body 10, and the second cathode tube end face is rigidly connected with the second ceramic tube end face, so as to form a continuous hollow tube. The cathode tube and the ceramic tube can be rigidly connected by any suitable connection method, which is not limited herein.

[0039] The conductive needle 30 is a needle-shaped structure made of conductive material. It can be fixed on the device body 10 and located in the internal space defined by the non-conductive portion of the hollow tube. In this embodiment, the term "internal space" is used to represent a specific area in the three-dimensional space divided by the hollow non-conductive portion. It is distinguished from other areas in the three-dimensional space, and the projection of any point in the specific area on the inner surface of the hollow tube falls within the non-conductive portion. In other words, the conductive needle 30 has appropriate size and position to ensure that its projection on the inner surface of the hollow tube does not exceed the non-conductive portion.

[0040] Specifically, the projection of the conductive needle 30 in the axial direction does not exceed the second ceramic tube end face, so as to ensure that the conductive needle 30 is located entirely in the internal space defined by the non-conductive portion of the hollow tube, and there is appropriate distance and spacing between the conductive portion 22 of the hollow tube, so as to form an ideal arc discharge path L.

[0041] In actual use, the conductive needle 30 acts as an anode, and the conductive portion 22 of the hollow tube acts as a cathode. Under the condition of external high voltage, an arc discharge path is formed between the anode and the cathode, and a high-temperature plasma is formed in the interior of the hollow tube through arc discharge.

[0042] Air or gas introduced through the gaps in the wall of the hollow tube can drive or power the plasma to form a plasma jet from inside the hollow tube to release heat to external devices or equipment (e.g., a cooking appliance placed on the plasma jet device) In some embodiments, please refer to Figure 1 At least a portion of the cathode tube 22 protrudes from the device body 10 to form a nozzle-like structure. Accordingly, the first cathode tube end face is an end face away from the device body.

[0043] Specifically, the first cathode tube end face can be configured as an open end to allow the heat of the plasma formed inside the hollow tube to be transferred outwardly through the first cathode tube end face. For example, the plasma can be driven by air or gas introduced through the gaps in the wall of the hollow tube to exit the hollow tube through the open end.

[0044] Preferably, the cathode tube can be configured as a frustum-like structure with a gradually decreasing inner diameter in the axial direction. Specifically, the gradually decreasing inner diameter refers to a gradually decreasing inner diameter from the second cathode tube end face to the first cathode tube end face. That is, the inner diameter of the second cathode tube end face is the largest, the inner diameter of the first cathode tube end face is the smallest, and the inner diameters between the two gradually change.

[0045] In some embodiments, as Figure 2 shown, the wall of the non-conductive portion 21 of the hollow tube can be provided with a plurality of gaps 23. The gaps 23 are spaced apart along the circumferential direction of the wall, and adjacent gaps 23 have substantially the same spacing angle.

[0046] Specifically, the gaps 23 are inclined gaps with respect to the radius of the hollow tube. In this application, the term "inclined gap" is used to indicate that the direction of the gap is inclined, which guides air or gas to enter the interior of the hollow tube at an angle.

[0047] In some embodiments, please refer to Figure 2 The plurality of inclined gaps 23 can be arranged in a counterclockwise direction, so that a spiral upward air force is generated inside the hollow tube, causing the plasma to rotate and accelerate towards the open end. Alternatively, the plurality of inclined gaps 23 can also be arranged in the opposite direction, i.e., in a clockwise direction, which can also achieve the effect of generating a spiral upward air force.

[0048] Preferably, in order to improve the efficiency of air or gas flow, the plasma jet device can further include an air supply device 40 arranged in the air flow channel.

[0049] The air supply device 40 is a device for driving air or gas flow. Any suitable type or size of device can be selected for use, depending on the actual situation. For example, a fan or blower of a particular size.

[0050] In actual use, the air supply device 40 is operated to drive the air or gas in the air flow passage into the interior of the hollow tube body, thereby continuously providing air power for the plasma and indirectly driving the plasma to exit the hollow tube body 20.

[0051] Specifically, please refer to Figure 1 The hollow tube body 20, the conductive needle 30, and the air supply device 40 are coaxially arranged. The central axes of the three structural components coincide with each other and are kept in the same axial direction, so as to ensure that the plasma can be efficiently driven out of the hollow tube body.

[0052] The plasma jet device provided by the embodiment of the present application can promote the rotational movement of the plasma in the form of helical rising through the air power entering obliquely, and accelerate the rotating plasma by using the air flow thrust. On the other hand, the cathode tube with a gradually decreasing inner diameter and a generally conical shape can play a compression role, further improving the speed of the plasma in the rotational movement of helical rising.

[0053] Based on the plasma jet device provided by the embodiment of the present application, the present application further provides an arc heating device. The arc heating device can be used as a cooking device for heating cookware or food. Figure 3 The arc heating device provided by the embodiment of the present application.

[0054] As Figure 3 shown, the arc heating device can include the plasma jet device 1 as described above. Exemplarily, Figure 3 The figure shows the case of arranging four hollow tube bodies 20 to form four heating nozzles. However, those skilled in the art can understand that a greater or smaller number of hollow tube bodies 20 can be arranged according to the actual situation, and the number of hollow tube bodies 20 is not limited to the four shown in the drawings. Figure 3

[0055] The hollow tube body 20 of the plasma jet device can form a heating nozzle of the arc heating device. The plasma formed in the interior of the hollow tube body exits from the opening end of the hollow tube body under the driving of various mechanisms such as air power, so as to heat the cookware or food placed above the opening end of the hollow tube body and complete the cooking process.

[0056] ​In actual use, the arc generated between the cathode and the anode due to high voltage forms high-temperature plasma. The plasma is accelerated by the air flow and is ejected from the open end of the hollow tube body, forming a more effective plasma working medium jet, which achieves the purpose of rapidly transferring heat in the nozzle to the cookware for heating.

[0057] The air supply device and the air flow channel continuously provide flowing air to the hollow tube body, which can enter the interior of the hollow tube body through the gaps formed on the tube wall to form an air flow that drives heat outward.

[0058] In some embodiments, as shown in Figure 4 In addition to the plasma jet device 1 described above, the arc heating device also includes a booster device 2.

[0059] The booster device 2 is a device or apparatus for increasing the pressure of the gas. Any suitable type of device can be selected for use as needed, such as an axial flow fan or other similar fan.

[0060] The booster device 2 is connected to the air flow channel formed by the device body 10 (e.g., provided at the air inlet), and by increasing the pressure of the gas in the air flow channel, the gas power is increased to accelerate the speed of the plasma. Moreover, the provision of the booster device 2 also maintains the continuous supply of gas, ensuring that there is sufficient air or gas in the air flow channel.

[0061] In summary, the plasma jet device provided by the embodiments of the present application promotes the ionization of the gaseous working medium through the unique hollow tube body design layout, and can generate high-density and relatively large-flow-rate plasma. Under the combined action of the air power spirally rising, the air flow thrust, and the compression exerted by the cathode tube with gradually decreasing inner diameter, the plasma generated in the hollow tube body can form a rapid jet, thereby effectively transferring heat energy to the cookware.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the same; under the idea of the present application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the present application as described above. In order to be brief, they are not provided in detail; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A plasma jet device, characterized by, The plasma jet device comprises: a device body forming at least one gas flow channel; a hollow tube body extending along an axial direction; the hollow tube body is fixed on the device body and has a non-conductive portion and a conductive portion; a conductive needle fixed on the device body; the conductive needle is located in an internal space defined by the non-conductive portion of the hollow tube body; wherein the tube wall of the non-conductive portion of the hollow tube body is provided with at least one notch to communicate the hollow tube body with the gas flow channel; the conductive needle forms an anode and the conductive portion of the hollow tube body forms a cathode, so that a spacing space between the anode and the cathode forms an arc discharge path in response to the application of an external voltage.

2. The plasma jet device of claim 1, wherein The non-conductive portion of the hollow tube body is a ceramic tube; wherein the ceramic tube has a first ceramic tube end face and a second ceramic tube end face facing away from each other; the first ceramic tube end face is fixed on the device body.

3. The plasma jet device of claim 2, wherein, The projection of the conductive needle in the axial direction does not exceed the second ceramic tube end face, so that the conductive needle is located entirely in the internal space defined by the non-conductive portion.

4. The plasma jet device of claim 2, wherein, The conductive portion of the hollow tube body is a cathode tube; wherein the cathode tube has a first cathode tube end face and a second cathode tube end face facing away from each other; the second cathode tube end face is rigidly connected with the second ceramic tube end face to form a continuous hollow tube body.

5. The plasma jet device of claim 4, wherein, At least a portion of the cathode tube protrudes from the device body; the first cathode tube end face is an end face away from the device body.

6. The plasma jet device of claim 5, wherein, The first cathode tube end face is an open end, so that the heat of the plasma formed in the hollow tube body is transmitted outward through the first cathode tube end face.

7. The plasma jet device of claim 4, wherein, In the axial direction, the inner diameter of the cathode tube gradually decreases; wherein the inner diameter of the second cathode tube end face is greater than the inner diameter of the first cathode tube end face.

8. The plasma jet device of claim 1, wherein, The tube wall of the non-conductive portion of the hollow tube body is provided with a plurality of notches; wherein a plurality of notches are spaced apart along the circumferential direction of the tube wall.

9. The plasma jet device of claim 8, wherein, The notch is an inclined notch inclined with respect to the radius of the hollow tube body.

10. The plasma jet device of claim 9, wherein, A plurality of inclined notches are arranged in a clockwise or counterclockwise direction, so that an upward air force is generated inside the hollow tube body.

11. The plasma jet device of claim 1, wherein, The gas flow channel further comprises at least one gas inlet; wherein the gas inlet communicates with an external space to allow gas in the external space to enter the gas flow channel.

12. The plasma jet device of claim 11, wherein, Further comprising: a blowing device arranged in the gas flow channel; wherein the blowing device is configured to drive the gas in the gas flow channel to enter the interior of the hollow tube body.

13. The plasma jet device of claim 12, wherein, The hollow tube body, the conductive needle and the blowing device are coaxially arranged and maintained in the same axial direction.

14. An arc heating device, characterized by The plasma jet device comprises: any one of claims 1-13.

15. The arc heating device of claim 14, wherein, Further comprising: a pressure boosting device connected with the device body of the plasma jet device and configured to increase the gas pressure inside the gas flow channel of the device body.

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