A plasma jet auxiliary device

Abstract

The present invention discloses a plasma jet auxiliary device, comprising: a detection control module, an interval adjuster and a grounding drain plate; the detection control module is connected to the output end of a high-voltage power supply in a plasma jet device; the top surface of the interval adjuster is open and located at the plasma jet nozzle, and the bottom surface is provided with through holes and grooves, and the plasma jet generated by the plasma jet device flows out through the bottom surface through holes; the grounding drain plate is embedded in the bottom surface groove of the interval adjuster and connected to a common ground electrode; the detection control module is used to monitor the voltage and current state of the plasma jet device in real time, and disconnect the high-voltage power supply of the plasma jet device when a fault occurs; the interval adjuster is used to control the length of the plasma jet and fix the grounding drain plate; the grounding drain plate is used to guide the discharge plasma current. The present invention can improve the application safety of the plasma jet device, and at the same time make the plasma array discharge uniformly, thereby improving the plasma performance.

Description

Technical Field

[0001] The invention belongs to the field of plasma application, and more specifically, relates to a plasma jet auxiliary device. Background Art

[0002] Atmospheric pressure non-equilibrium plasma is a plasma generated under atmospheric pressure, whose electron temperature can be as high as tens of thousands of degrees, while the temperature of ions and neutral particles is much lower than the electron temperature, usually close to room temperature, so the gas temperature during discharge is also close to room temperature. Atmospheric pressure low-temperature plasma jet device can generate plasma jet under atmospheric pressure, will not limit the size of the plasma discharge gap of the treated object, is easy to operate, and the generated gas temperature is low and highly active. Existing plasma jet devices have been able to generate various types of non-thermal equilibrium plasma under atmospheric pressure, such as patent document CN101426327A discloses a plasma jet device, which generates a jet by blowing a working gas into a hollow air tube and configuring a high-voltage electrode at the outlet of the hollow air tube; patent document CN102523674A discloses a handheld plasma torch, which generates a jet by applying a DC high voltage to the needle electrode to break through the working gas between the needle tip and the target surface; patent document CN106304591A also discloses a jet device with multiple air tube channels. At present, non-thermal equilibrium plasma has been widely used in plasma biomedical research, such as promoting wound healing, transdermal drug delivery, sterilization and disinfection, beauty and skin care, and tumor treatment.

[0003] However, there are two safety hazards in the use of existing plasma jet devices. First, when the current plasma jet device is working, the working current flows from the high-voltage power supply through the plasma jet device to the surface of the treated object, then passes through the inside of the treated object, and finally flows back to the ground through another grounding point of the treated object. In this way, when the plasma current increases sharply due to special reasons, the human body will likely be subjected to a current exceeding the safety threshold when being treated or mistakenly treated, thereby causing harm to the user's body; secondly, since the plasma jet device often works under high voltage conditions of thousands of volts, the probability of damage to the components inside the device is very high, and the existing plasma jet device does not have a fault diagnosis module, nor does it have a safety action to respond to the fault, which poses a great safety hazard to the user. In addition, the existing plasma jet device also has the problem of uneven discharge, and all high-voltage electrodes cannot discharge at the same time, resulting in uneven distribution of the generated active particles. These are all problems that need to be solved in the actual application of the current plasma jet device.

[0004] In general, existing plasma jet devices have the problems of low application safety and uneven distribution of generated active particles. Summary of the invention

[0005] In view of the defects of the prior art, the purpose of the present invention is to provide a plasma jet auxiliary device, aiming to solve the problems of low application safety and uneven distribution of active particles generated by the existing plasma jet device.

[0006] To achieve the above-mentioned object, the present invention provides a plasma jet auxiliary device, comprising: a detection control module, a spacing adjuster and a grounding drain plate;

[0007] The detection control module is connected to the high voltage power supply output terminal in the plasma jet device;

[0008] The top surface of the interval adjuster is open and located at the plasma jet nozzle in the plasma jet device, and the bottom surface is distributed with through holes and grooves, and the plasma jet generated by the plasma jet device flows out through the bottom surface through holes;

[0009] The grounding drain plate is embedded in the bottom groove of the interval adjuster and connected to the common ground electrode;

[0010] The detection control module is used to monitor the voltage and current status of the plasma jet device in real time, and disconnect the high voltage power supply of the plasma jet device when a fault occurs;

[0011] The interval adjuster is used to control the length of the plasma jet and fix the grounding drain plate;

[0012] The grounding guide plate is used to guide the plasma discharge current.

[0013] Further, the detection control module includes a voltage sensor, a current sensor and an analysis control unit;

[0014] The voltage sensor is used to measure the voltage at the input end of the plasma jet device;

[0015] The current sensor is used to measure the current at the input end of the plasma jet device;

[0016] The analysis control unit is used to compare the measured voltage and current with corresponding set thresholds, and when the measured voltage or current exceeds the set threshold, disconnect the high voltage power supply of the plasma jet device.

[0017] Furthermore, the distance between the bottom surface of the interval adjuster and the plasma jet nozzle in the plasma jet device can be changed.

[0018] Furthermore, the number of plasma jets passing through each through hole distributed on the bottom surface of the interval adjuster is one or more.

[0019] Furthermore, the interval adjuster is made of an insulating medium.

[0020] Furthermore, the insulating medium is a polytetrafluoroethylene alkyl resin.

[0021] Furthermore, the shape, quantity and arrangement of the through holes distributed on the bottom surface of the interval adjuster and the distribution of the grounding drain plates are determined according to the arrangement of the plasma array generated by the plasma jet device.

[0022] Furthermore, the grounding drain plate is made of stainless steel, copper or aluminum.

[0023] Compared with the prior art, the above technical solution conceived by the present invention can achieve the following beneficial effects:

[0024] (1) The grounding drain plate provided in the present invention, on the one hand, allows the plasma discharge current to flow through the surface of the treated object and then flow into the ground through the grounding drain plate, thereby preventing the plasma discharge current from directly passing through the human body and reducing the risk of electric shock to the human body; on the other hand, it allows all high-voltage electrodes to discharge simultaneously, the plasma array to discharge evenly, and the generated active particles to be evenly distributed, thereby improving the plasma performance.

[0025] (2) The detection and control module provided in the present invention can detect the operating status of the plasma jet device in real time, promptly discover the operating faults and potential problems of the plasma jet device, and promptly cut off the power supply when an abnormality occurs in the plasma jet device to prevent human body from contacting currents higher than the safety threshold, thereby improving the application safety of the plasma jet device.

[0026] (3) The interval adjuster provided in the present invention can control the distance between the plasma nozzle and the object to be processed, effectively preventing the user from placing the plasma nozzle too close to the object to be processed due to misoperation, thereby reducing the risk of burns and further improving the application safety of the plasma jet device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of a plasma jet auxiliary device provided by a first embodiment of the present invention;

[0028] FIG. 2( a ) is a three-dimensional schematic diagram of a spacing adjuster used in a first embodiment of the present invention;

[0029] FIG2( b ) is a schematic diagram of the structure of the bottom surface of the interval adjuster and the corresponding grounding drain piece in the first embodiment of the present invention;

[0030] FIG3( a ) is a spacing adjuster provided by the present invention, the bottom surface of which adopts an arc-shaped opening structure;

[0031] FIG3( b ) is a schematic diagram of a grounding drain plate structure corresponding to the spacing adjuster structure of FIG3( a );

[0032] FIG4( a ) is a spacing adjuster provided by the present invention, the bottom surface of which adopts a circularly arranged opening structure;

[0033] FIG4( b ) is a schematic diagram of a grounding drain plate structure corresponding to the spacing adjuster structure of FIG4( a );

[0034] Figure 5 A schematic structural diagram of a plasma jet auxiliary device provided in accordance with a second embodiment of the present invention;

[0035] 1 is a high voltage power supply, 2 is an analysis control unit, 3 is a current sensor, 4 is a first voltage sensor, 5 is a second voltage sensor, 6 is a protection resistor, 7 is a DC high voltage driven air plasma array generating device, 8 is an interval adjuster, 9 is a grounding drain plate, 10 is a working gas source, 11 is a gas flow control switch, and 12 is an AC high voltage driven inert gas plasma generating device. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0037] As a first embodiment of the present invention, the present invention provides a plasma jet auxiliary device, comprising: a detection control module, a spacing adjuster 8 and a grounding drain plate 9;

[0038] The detection control module is connected to the output end of the high voltage power supply in the plasma jet device;

[0039] Specifically, Figure 1 As shown, the auxiliary device of the present invention is applied to a DC high voltage driven air plasma array generating device 7, and accordingly, the detection control module includes an analysis control unit 2, a current sensor 3, a first voltage sensor 4 and a second voltage sensor 5;

[0040] The first voltage sensor 4 and the second voltage sensor 5 are used to measure the voltage across the protection resistor 6 respectively.

[0041] A current sensor 3 is used to measure the current at the high voltage input end of the air plasma array;

[0042] The analysis control unit 2 is used to compare the measured voltage and current with corresponding set thresholds, and disconnect the high voltage power supply 1 when the measured voltage or current exceeds the set threshold.

[0043] The top surface of the interval adjuster 8 is open and located at the plasma jet nozzle of the air plasma array generating device 7. The bottom surface is provided with through holes and grooves. The plasma jet generated by the air plasma array generating device 7 flows out through the bottom through holes.

[0044] When in use, the bottom surface of the interval adjuster 8 contacts the object to be processed, and the plasma jet length is adjusted by adjusting the distance between the bottom surface and the high-voltage needle electrode of the plasma array.

[0045] The grounding drain plate 9 is embedded in the bottom groove of the interval adjuster 8 and connected to the common ground electrode;

[0046] The structure of the interval adjuster in this embodiment is shown in Figure 2(a), and the material used can be polytetrafluoroethylene alkyl resin. Since the plasma array used is arranged in a 7×10 manner, the bottom surface of the interval adjuster has 7 rectangular through holes, and each through hole corresponds to 10 linearly arranged high-voltage needle electrodes, but the present invention is not limited to this. The number of plasma jets passing through each through hole distributed on the bottom surface of the interval adjuster in the present invention is one or more; in actual application, the shape, number, and arrangement of the through holes can be adjusted accordingly according to the arrangement of the plasma array; a spacing adjuster with an arc-shaped opening structure on the bottom surface as shown in Figure 3(a), and a spacing adjuster with a circularly arranged opening structure on the bottom surface as shown in Figure 4(a); the spacing adjuster of the present invention can also be made of other insulating media.

[0047] In this embodiment, a schematic diagram of the bottom surface of the interval adjuster and the corresponding grounding drain plate structure is shown in Figure 2(b). The grounding drain plate is embedded in the groove on the bottom surface of the interval adjuster, flush with the lower bottom surface of the interval adjuster, and arranged around the plasma. However, the present invention is not limited to this. The distribution of the grounding drain plates can be adjusted accordingly according to the arrangement of the plasma array, such as a grounding drain plate structure corresponding to the interval adjuster structure shown in Figure 3(a) as shown in Figure 3(b), and a grounding drain plate structure corresponding to the interval adjuster structure shown in Figure 4(a) as shown in Figure 4(b); the material of the grounding drain plate in the present invention can be stainless steel, copper or aluminum.

[0048] The air plasma array generating device 7 generates an array of surrounding plasmas, and the discharge current passes through the surface of the treated object and finally flows into the earth through the grounding drainage sheet. This can solve the problem of uneven discharge that often occurs in the plasma array and the inability of all needle electrodes to discharge at the same time, thereby making the plasma electric field more uniform and enhancing the performance of the plasma. On the other hand, when the treated object is human skin or tissue, since the discharge current passes through the surface of the treated skin and finally flows into the earth through the grounding drainage sheet, the human body can be isolated from the plasma circuit, greatly reducing the human body's electric touch and potential risk of electric shock.

[0049] As a second embodiment of the present invention, the auxiliary device of the present invention is applied to an inert gas plasma generating device driven by AC high voltage, such as Figure 5 As shown, the frequency range of the AC power supply used can be between tens of Hz and hundreds of kHz, the working gas is helium, and the gas flow control switch 11 controls the working gas of the working gas source 10 to enter the plasma generator to generate helium plasma. Since the power supply is an AC power supply, the grounding drain plate 9 is fixed inside the groove on the bottom surface of the interval adjuster 8, and the rest of the structure is no different from the first embodiment of the present invention.

[0050] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A plasma jet assist device, characterized in that: include: Detection control module, interval adjuster and grounding drain plate; The detection control module is connected to the high voltage power supply output terminal in the plasma jet device; The top surface of the interval adjuster is open and located at the plasma jet nozzle in the plasma jet device, and the bottom surface is distributed with through holes and grooves, and the plasma jet generated by the plasma jet device flows out through the bottom surface through holes; The grounding drain plate is embedded in the bottom groove of the interval adjuster and connected to the common ground electrode; The detection control module is used to monitor the voltage and current status of the plasma jet device in real time, and disconnect the high voltage power supply of the plasma jet device when a fault occurs; The interval adjuster is used to control the length of the plasma jet and fix the grounding drain plate; The grounding guide plate is used to guide the plasma discharge current.

2. A plasma jet assist device according to claim 1, characterized in that: The detection control module includes a voltage sensor, a current sensor and an analysis control unit; The voltage sensor is used to measure the voltage at the input end of the plasma jet device; The current sensor is used to measure the current at the input end of the plasma jet device; The analysis control unit is used to compare the measured voltage and current with corresponding set thresholds, and when the measured voltage or current exceeds the set threshold, disconnect the high voltage power supply of the plasma jet device.

3. A plasma jet assist device according to claim 1 or 2, characterized in that: The distance between the bottom surface of the interval adjuster and the plasma jet nozzle in the plasma jet device is adjustable.

4. A plasma jet assist device according to claim 3, characterized in that: The number of plasma jets passing through each through hole distributed on the bottom surface of the interval adjuster is one or more.

5. A plasma jet assist device according to any one of claims 1 to 4, characterized in that: The interval adjuster is made of insulating medium.

6. A plasma jet assist device according to claim 5, characterized in that: The insulating medium is polytetrafluoroethylene alkyl resin.

7. A plasma jet assist device according to any one of claims 1 to 6, characterized in that: The shape, quantity and arrangement of the through holes distributed on the bottom surface of the interval adjuster and the distribution of the grounding drain plates are determined according to the arrangement of the plasma array generated by the plasma jet device.

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