Dielectric barrier discharge plasma device

Abstract

The invention relates to the technical field of plasmas, in particular to a dielectric barrier discharge plasma device which comprises a dielectric barrier body, an inner electrode body and an outer electrode body, the inner electrode body is located in the dielectric barrier body, and a gap exists between the inner electrode body and the dielectric barrier body; the outer electrode body is located on the outer side of the dielectric barrier body, and the outer electrode body comprises a first outer electrode layer and a second outer electrode layer; an interlayer is formed between the first outer electrode layer and the dielectric barrier, and the second outer electrode layer is arranged in the interlayer; by arranging the double-layer outer electrode body, the problem that the outer electrode loses efficacy due to pollution is avoided, and the discharge stability is improved.

Description

Technical Field

[0001] The present invention relates to the field of plasma technology, and particularly to a dielectric barrier discharge plasma device. Background Art

[0002] With the development of society, environmental pollution caused by human activities has become increasingly serious. Currently, the air quality is deteriorating further. A variety of gaseous pollutants generated by increasing industrial waste gases, automobile exhausts, and home decoration operations have begun to seriously threaten human health.

[0003] For industrial waste gas treatment currently available, there are dielectric barrier discharge technology and corona discharge technology. Dielectric barrier discharge has the characteristics of uniformity, diffuseness, and stability. The electromagnetic field strength where the generated plasma is located is high, and the active particles in the plasma have relatively high energy. It is safer and has a longer electrode life compared to other plasma forms. However, currently, the dielectric barrier plasma device is in a form of linear ionization, which makes the pollutants unable to fully contact the plasma in the discharge area, resulting in low purification efficiency. At the same time, since the waste gas contacts the outer electrode on the outside, the pollutants are easily adsorbed and accumulated on the outer electrode, and the electrode is prone to failure due to pollution coverage, so it needs to be replaced or cleaned regularly. Summary of the Invention

[0004] (I) Technical Problems to be Solved

[0005] Aiming at the deficiencies of the prior art, the present invention provides a dielectric barrier discharge plasma device, which avoids the problem of the outer electrode failing due to pollution by setting a double-layer outer electrode body, and improves the discharge stability.

[0006] (II) Technical Solutions

[0007] To achieve the above object, the embodiments of the present application provide a dielectric barrier discharge plasma device, including a dielectric barrier body, an inner electrode body, and an outer electrode body. The inner electrode body is located inside the dielectric barrier body, and there is a gap between the inner electrode body and the dielectric barrier body; the outer electrode body is located outside the dielectric barrier body, and the outer electrode body includes a first outer electrode layer and a second outer electrode layer; a sandwich layer is formed between the first outer electrode layer and the dielectric barrier body, and the second outer electrode layer is arranged in the sandwich layer.

[0008] Preferably, the second outer electrode layer is a stainless steel powder filling layer.

[0009] Preferably, the dielectric barrier body is in a cylindrical structure, an air inlet is formed at one end of the dielectric barrier body, and an air outlet is formed at the other end; one end of the inner electrode body close to the air inlet is connected to a first conductor, and the other end close to the air outlet is connected to a second conductor.

[0010] Preferably, a primary filtration module is provided inside the dielectric barrier body and at one end of the inner electrode body close to the air inlet.

[0011] Preferably, the primary filtration module includes a guide tube, a filter box, a first filter layer, and a second filter layer; the guide tube is made of an insulating material and is sleeved outside the first conductor; a mounting hole is formed in the middle of the filter box, and the filter box is sleeved outside the guide tube through the mounting hole; an annular mounting cavity is formed inside the filter box, and grid plates are formed on both sides of the filter box perpendicular to the first conductor; both the first filter layer and the second filter layer are arranged in the mounting cavity, and the first filter layer has larger pores than the second filter layer; the first filter layer is located at the end close to the air inlet, and the second filter layer is located at the end far from the air inlet.

[0012] Preferably, sealing strips are arranged at intervals on the outer wall of the filter box. The sealing strips are made of rubber material and are in contact with the inner wall of the dielectric barrier body.

[0013] Preferably, a flow guide plate is provided inside the dielectric barrier body. The flow guide plate is funnel-shaped, and a connection hole is formed in the middle of the flow guide plate. The flow guide plate is located between the filter box and the inner electrode body. The end with a smaller cross-sectional area of the flow guide plate is close to the filter box and is connected to the guide tube through the connection hole. The end with a larger cross-sectional area of the flow guide plate is close to the inner electrode body, and the maximum diameter of the cross-sectional area of the flow guide plate is less than or equal to the outer diameter of the inner electrode body.

[0014] Preferably, connection heads are detachably connected to both ends of the dielectric barrier body. The connection head includes a main pipe and a branch joint; one end of the main pipe is connected to the air inlet or the air outlet, and the other end forms an opening. The branch joint is connected to one side of the main pipe for connecting a power supply; a partition is integrally formed inside the main pipe, and a connection terminal is integrally formed on one side of the partition close to the inside of the dielectric barrier body. The connection terminal is in contact with the first conductor or the second conductor, and the branch joint is electrically connected to the connection terminal; a plurality of communication ports are formed on the partition and outside the connection terminal.

[0015] (III) Beneficial effects

[0016] The present invention provides a dielectric barrier discharge plasma device. By arranging a sandwich layer inside the first outer electrode layer and adding a second outer electrode layer inside the sandwich layer, the outside of the second outer electrode layer is protected by the first outer electrode layer, preventing pollution, improving the overall service life of the outer electrode body, and extending the maintenance cycle. At the same time, the plasma has a memory effect. Due to the residual charge on the surface of the dielectric barrier, it will affect the subsequent discharge uniformity and efficiency. The stainless steel powder filling layer is composed of multiple solid particles integrated. During use, when the device vibrates, the internal particles of the powder will shift, solving the problem of residual charge. The role of the dielectric barrier is to limit the current growth, avoid the formation of arcs, and ensure stable and controllable discharge. The stainless steel powder filling layer contains air in the middle, which also inhibits the formation of arcs and makes the device stable. Currently, due to the problem of electrode uniformity in DBD technology, there is uneven discharge, which affects the discharge efficiency. Adding a stainless steel powder layer makes the outer electrode smoother in disguise and makes the discharge more uniform.

[0017] Secondly, in the present application, a primary filtration module is provided at one end of the dielectric barrier near the air inlet, which can preliminarily filter the pollution sources entering the dielectric barrier and prevent sundries from entering the gap between the inner electrode body and the dielectric barrier. At the same time, the filter box is connected to the first conductor, thereby limiting the inner electrode body and keeping its position stable. When the device vibrates, the gap between the inner electrode body and the dielectric barrier can remain stable, making the inner electrode smoother to a certain extent and improving the uniformity of subsequent discharges. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of the first embodiment of the present invention;

[0019] Figure 2 is a schematic structural diagram of the second embodiment of the present invention;

[0020] Figure 3 Highlighted in the present invention Figure 2 is an enlarged view of structure A;

[0021] Figure 4 is a cross-sectional view highlighting the filter box of the present invention;

[0022] Figure 5 is a cross-sectional view highlighting the connector of the present invention.

[0023] Reference numerals in the drawings:

[0024] 100, Dielectric barrier; 110, Air inlet; 120, Air outlet; 200, Inner electrode body; 210, First conductor; 220, Second conductor; 300, Outer electrode body; 310, First outer electrode layer; 311, Interlayer; 320, Second outer electrode layer; 400, Primary filtration module; 410, Guide tube; 420, Filter box; 421, Mounting hole; 422, Mounting cavity; 423, Grille plate; 430, First filter layer; 440, Second filter layer; 450, Sealing strip; 500, Deflector; 510, Connecting hole; 600, Connector; 610, Main pipeline; 611, Partition; 612, Connection terminal; 613, Communication port; 620, Branch joint. Detailed implementation

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] First embodiment

[0027] The present invention provides a dielectric barrier discharge plasma device. Refer to Figure 1 , which includes a dielectric barrier 100, an inner electrode body 200, and an outer electrode body 300. Among them, the dielectric barrier 100 is a cylindrical tubular structure. An air inlet 110 is formed at one end of the dielectric barrier 100, and an air outlet 120 is formed at the other end. Specifically, the dielectric barrier 100 can be made of quartz glass tube.

[0028] The inner electrode body 200 is a cylindrical structure, which is arranged inside the dielectric barrier 100, and there is a gap between the inner electrode body 200 and the dielectric barrier 100. Plasma is generated in this gap during operation. The outer electrode body 300 is located outside the dielectric barrier 100 and corresponds to the position of the inner electrode body 200. When operating, the power supply acts on the outer electrode body 300 and the inner electrode body 200, and then plasma is generated in the gap between the two.

[0029] Specifically, the outer electrode body 300 includes a first outer electrode layer 310 and a second outer electrode layer 320; the first outer electrode layer 310 is fixedly connected to the dielectric barrier 100, and an interlayer 311 is formed between the two. The second outer electrode layer 320 is arranged in the interlayer 311. Among them, the first outer electrode is a stainless steel sleeve, and the second outer electrode layer 320 is a stainless steel powder filling layer. A double-layer outer electrode is formed by the stainless steel sleeve and the stainless steel powder filling layer.

[0030] If the first outer electrode layer 310 is set separately, during operation, due to contact with the exhaust gas, pollutants will be adsorbed on the first outer electrode layer 310, and the first outer electrode layer 310 may fail due to pollutant coverage. Therefore, it is necessary to regularly replace or clean the first outer electrode layer 310.

[0031] However, in this application, by providing a sandwich layer 311 inside the first outer electrode layer 310 and adding a second outer electrode layer 320 inside the sandwich layer 311, the outside of the second outer electrode layer 320 is protected by the first outer electrode layer 310, and no pollution phenomenon will occur, improving the overall service life of the outer electrode body 300 and also extending the maintenance cycle.

[0032] Meanwhile, the plasma has a memory effect. Due to the residual charge on the surface of the dielectric barrier 100, it will affect the subsequent discharge uniformity and efficiency. The stainless steel powder filling layer is composed of multiple solid particles integrated. During use, when the device vibrates, the internal particles of the powder will shift, solving the problem of residual charge.

[0033] The function of the dielectric barrier 100 is to limit the current growth, avoid the formation of arcs, and ensure stable and controllable discharge. The stainless steel powder filling layer contains air in between, which also inhibits the formation of arcs and makes the device stable. Currently, due to the electrode uniformity problem in the DBD technology, there is a phenomenon of uneven discharge, which affects the discharge efficiency. Adding a stainless steel powder layer makes the outer electrode smoother in effect and makes the discharge more uniform.

[0034] One end of the inner electrode body 200 close to the air inlet 110 is connected to a first conductor 210, and one end close to the air outlet 120 is connected to a second conductor 220. The power supply is connected through the first conductor 210 and the second conductor 220.

[0035] Second Embodiment

[0036] Refer to Figures 2 - 4 , the difference between this embodiment and the first embodiment is that: a primary filtration module 400 is provided inside the dielectric barrier 100 and at the end of the inner electrode body 200 close to the air inlet 110.

[0037] Specifically, the primary filtration module 400 includes a guide tube 410, a filter box 420, a first filter layer 430, and a second filter layer 440. The guide tube 410 is made of insulating material, and the guide tube 410 is sleeved outside the first conductor 210. An installation hole 421 is formed in the middle of the filter box 420, and the filter box 420 is sleeved outside the guide tube 410 through the installation hole 421. An annular installation cavity 422 is formed inside the filter box 420, and grid plates 423 are formed on both sides of the filter box 420 perpendicular to the first conductor 210; a plurality of pores are formed at intervals on the grid plates 423 and communicate with the installation cavity 422 through the pores.

[0038] Both the first filter layer 430 and the second filter layer 440 are arranged in the installation cavity 422. The first filter layer 430 has larger pores than the second filter layer 440. The first filter layer 430 is located at the end close to the air inlet 110, and the second filter layer 440 is located at the end far from the air inlet 110. That is, when the pollution source passes through the interior of the dielectric barrier 100, it first passes through the first filter layer 430 and then through the second filter layer 440. Through the provided primary filter module 400, the pollution source entering the dielectric barrier 100 can be preliminarily filtered to prevent debris from entering the gap between the inner electrode body 200 and the dielectric barrier 100. At the same time, the filter box 420 is connected to the first conductor 210, thereby limiting the inner electrode body 200 to keep its position stable. When the device vibrates, the gap between the inner electrode body 200 and the dielectric barrier 100 can remain stable, making the inner electrode smoother to a certain extent and improving the uniformity of subsequent discharges.

[0039] In one embodiment, a sealing strip 450 is arranged at intervals on the outer side wall of the filter box 420. The sealing strip 450 is made of rubber material and abuts against the inner wall of the dielectric barrier 100. Through the provided sealing strip 450, a sealing effect is achieved to a certain extent, so that all the pollution sources entering the dielectric barrier 100 can pass through the first filter layer 430 and the second filter layer 440 for preliminary filtering.

[0040] In one embodiment, a flow guide plate 500 is arranged inside the dielectric barrier 100. The flow guide plate 500 is funnel-shaped. A connection hole 510 is opened in the middle of the flow guide plate 500. The flow guide plate 500 is located between the filter box 420 and the inner electrode body 200. The end with a smaller cross-sectional area of the flow guide plate 500 is close to the filter box 420 and is connected to the guide pipe 410 through the connection hole 510. The end with a larger cross-sectional area of the flow guide plate 500 is close to the inner electrode body 200. The maximum diameter of the cross-sectional area of the flow guide plate 500 is less than or equal to the outer diameter of the inner electrode body 200. Through the provided flow guide plate 500, when the pollution source is filtered by the filter box 420, the flow guide plate 500 can play a guiding role, enabling the pollution source to quickly enter the gap between the inner electrode body 200 and the dielectric barrier 100. Before entering the gap between the inner electrode body 200 and the dielectric barrier 100, it serves the purpose of rectification, which can not only increase the flow rate, improve the purification efficiency, but also improve the uniformity of discharge.

[0041] In one embodiment, connectors 600 are detachably connected to both ends of the dielectric barrier 100. The connector 600 includes a main pipe 610 and a branch joint 620.

[0042] One end of the main duct 610 is connected to the air inlet 110 or the air outlet 120, and the other end forms an opening. The branch joint 620 is connected to one side of the main duct 610 for connecting a power source. A partition 611 is integrally formed inside the main duct 610. A connection terminal 612 is integrally formed on one side of the partition 611 close to the inside of the dielectric barrier 100. The connection terminal 612 is electrically connected to the first conductor 210 or the second conductor 220, and the branch joint 620 and the connection terminal 612 are electrically connected. A plurality of communication ports 613 are provided on the partition 611 and outside the connection terminal 612.

[0043] Through the provided connection head 600 and the flow guide plate 500, the middle filter cartridge 420 can be limited to a certain extent, and after installation, the whole device is kept stable. At the same time, when working for a period of time, it is convenient to replace the filter cartridge 420.

[0044] The present invention provides a dielectric barrier discharge plasma device. By providing an interlayer 311 inside the first outer electrode layer 310 and adding a second outer electrode layer 320 inside the interlayer 311, the outside of the second outer electrode layer 320 is protected by the first outer electrode layer 310, and no pollution phenomenon will occur, which improves the overall service life of the outer electrode body 300 and also extends the maintenance period. At the same time, the plasma has a memory effect. Due to the residual charge on the surface of the dielectric barrier 100, the subsequent discharge uniformity will be affected, affecting the efficiency. The stainless steel powder filling layer is integrated by a plurality of solid particles. During the use process, when the device vibrates, the internal particles of the powder will shift, solving the problem of residual charge. The function of the dielectric barrier 100 is to limit the current growth, avoid the formation of arcs, and ensure stable and controllable discharge. The stainless steel powder filling layer is interspersed with air, which also plays an inhibitory role in the formation of arcs, making the device stable. At present, due to the problem of electrode uniformity in the DBD technology, there is a phenomenon of uneven discharge, which affects the discharge efficiency. Adding a stainless steel powder layer makes the outer electrode smoother in disguise and makes the discharge more uniform.

[0045] Secondly, the present application provides a primary filter module 400 at one end of the dielectric barrier 100 close to the air inlet 110, which can preliminarily filter the pollution sources entering the dielectric barrier 100 and avoid sundries from entering the gap between the inner electrode body 200 and the dielectric barrier 100. At the same time, the filter cartridge 420 is connected to the first conductor 210, thereby limiting the inner electrode body 200 and keeping its position stable. When the device vibrates, the gap between the inner electrode body 200 and the dielectric barrier 100 can be kept stable, making the inner electrode smoother to a certain extent and improving the subsequent discharge uniformity.

[0046] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0047] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. Without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0048] The above-described embodiments only represent the implementation manners of the present invention, and their descriptions are relatively specific and detailed, but should not be construed as a limitation on the scope of the patent of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A dielectric barrier discharge plasma device, characterized in that: It includes a dielectric barrier (100), an inner electrode body (200), and an outer electrode body (300). The inner electrode body (200) is located inside the dielectric barrier (100), and there is a gap between the inner electrode body (200) and the dielectric barrier (100). The outer electrode body (300) is located outside the dielectric barrier (100). The outer electrode body (300) includes a first outer electrode layer (310) and a second outer electrode layer (320). A sandwich layer (311) is formed between the first outer electrode layer (310) and the dielectric barrier (100), and the second outer electrode layer (320) is arranged in the sandwich layer (311).

2. The dielectric barrier discharge plasma device according to claim 1, wherein: The second outer electrode layer (320) is a stainless steel powder filling layer.

3. The dielectric barrier discharge plasma device according to claim 1, characterized in that: The dielectric barrier (100) is of a cylindrical structure. An air inlet (110) is formed at one end of the dielectric barrier (100), and an air outlet (120) is formed at the other end. One end of the inner electrode body (200) close to the air inlet (110) is connected to a first conductor (210), and one end close to the air outlet (120) is connected to a second conductor (220).

4. The dielectric barrier discharge plasma device according to claim 3, characterized in that: A primary filtration module (400) is arranged inside the dielectric barrier (100) and at one end of the inner electrode body (200) close to the air inlet (110).

5. The dielectric barrier discharge plasma device according to claim 4, characterized in that: The primary filtration module (400) includes a guide tube (410), a filter box (420), a first filter layer (430), and a second filter layer (440). The guide tube (410) is made of an insulating material and is sleeved outside the first conductor (210). An installation hole (421) is formed in the middle of the filter box (420), and the filter box (420) is sleeved outside the guide tube (410) through the installation hole (421). An annular installation cavity (422) is formed inside the filter box (420), and grid plates (423) are formed on the two side faces of the filter box (420) perpendicular to the first conductor (210). Both the first filter layer (430) and the second filter layer (440) are arranged in the installation cavity (422). The pores of the first filter layer (430) are larger than those of the second filter layer (440). The first filter layer (430) is located at the end close to the air inlet (110), and the second filter layer (440) is located at the end far from the air inlet (110).

6. The dielectric barrier discharge plasma device according to claim 5, wherein: Sealing strips (450) are arranged at intervals on the outer side wall of the filter box (420). The sealing strips (450) are made of rubber material, and the sealing strips (450) are in contact with the inner wall of the dielectric barrier (100).

7. The dielectric barrier discharge plasma device according to claim 5, characterized in that: A flow guide plate (500) is arranged inside the dielectric barrier (100). The flow guide plate (500) is funnel-shaped. A connection hole (510) is formed in the middle of the flow guide plate (500). The flow guide plate (500) is located between the filter box (420) and the inner electrode body (200). The end with a smaller cross-sectional area of the flow guide plate (500) is close to the filter box (420) and is connected to the guide pipe (410) through the connection hole (510). The end with a larger cross-sectional area of the flow guide plate (500) is close to the inner electrode body (200). The maximum diameter of the cross-sectional area of the flow guide plate (500) is less than or equal to the outer diameter of the inner electrode body (200).

8. The dielectric barrier discharge plasma device according to claim 3, characterized in that: Connectors (600) are detachably connected to both ends of the dielectric barrier (100). The connector (600) includes a main pipe (610) and a branch joint (620). One end of the main pipe (610) is connected to the air inlet (110) or the air outlet (120), and the other end forms an opening. The branch joint (620) is connected to one side of the main pipe (610) and is used for connecting a power supply. A partition plate (611) is integrally formed inside the main pipe (610). A connection terminal (612) is integrally formed on the side surface of the partition plate (611) close to the inside of the dielectric barrier (100). The connection terminal (612) contacts the first conductor (210) or the second conductor (220). The branch joint (620) is electrically connected to the connection terminal (612). A plurality of communication ports (613) are formed in the partition plate (611) and are located outside the connection terminal (612).

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