CN113975425A

CN113975425A - Plasma sterilization device

Info

Publication number: CN113975425A
Application number: CN202111130371.8A
Authority: CN
Inventors: 刘洪涛; 刘建兵; 刘斌
Original assignee: Shenzhen United Imaging Research Institute of Innovative Medical Equipment
Current assignee: Shenzhen United Imaging Research Institute of Innovative Medical Equipment
Priority date: 2021-09-26
Filing date: 2021-09-26
Publication date: 2022-01-28
Anticipated expiration: 2041-09-26
Also published as: CN113975425B

Abstract

The present invention relates to a plasma sterilization apparatus, comprising: an insulating housing; the power electrode comprises an electrode body and a plurality of projecting electrodes, and the electrode body is at least partially arranged in the insulating shell; the electrode body is provided with a first surface, a plurality of projecting electrodes are uniformly arranged on the first surface at intervals, and the projecting electrodes project out of the first surface and at least partially extend out of the insulating shell; and the insulating medium layer comprises a medium body layer and a medium protruding layer protruding out of the medium body layer, the medium body layer covers the first surface, and the medium protruding layer covers the surface of the protruding electrode. The plasma sterilization device has the advantages of simple structure, low cost, good sterilization effect and no limitation on unit sterilization area.

Description

Plasma sterilization device

Technical Field

The invention relates to the technical field of plasma generating devices, in particular to a plasma sterilizing device.

Background

Air transmission is the main path for spreading the virus, and the traditional disinfection means can not effectively and rapidly block the virus transmission, for example, the traditional disinfection means only can passively isolate the virus and reduce the transmission speed of the virus by means of a surgical mask. And the low-temperature plasma has obvious inactivation effect on the aspect of microorganism inactivation, particularly the aspect of inactivation of severe acute respiratory infectious viruses. The low-temperature plasma sterilization equipment can be used for inactivating living pathogens of individuals and doctors and patients and repeatedly utilizing the sterilized shortage of medical instruments, and can meet the sterilization and bacteriostasis requirements of different daily standards for a long time and conveniently.

The existing low-temperature plasma sterilization equipment conventionally adopts a Dielectric Barrier Discharge (DBD) structure. The basic principle of sterilization by adopting the low-temperature plasma sterilization equipment with the dielectric barrier discharge structure is as follows: an insulating medium is inserted into a discharge space between the power electrode and the ground electrode, and alternating current is applied to the power electrode and the ground electrode, so that discharge gas in the discharge space is subjected to breakdown discharge, thereby generating plasma for sterilization.

The basic condition for ensuring the efficient sterilization effect of the plasma is to maintain stable and rich plasma gas-phase active nitrogen-oxygen species (O, O2, O3, OH, NO, H2O2, NO2 and the like). The low-temperature plasma sterilization equipment adopting a dielectric barrier discharge structure at present needs to be additionally provided with a gas source in order to generate sufficient active nitrogen and oxygen species. A sufficient amount of discharge gas is provided by an additionally provided gas source so that a sufficient amount of plasma can be generated and, in turn, a sufficient amount of reactive nitrogen oxygen species can be generated. The gas source needs to be additionally configured, so that the structural complexity and the cost of the low-temperature plasma sterilization equipment are increased.

The plasma generated by the existing low-temperature plasma sterilization equipment flows to the outside through an air outlet of the low-temperature plasma sterilization equipment, so that the external treated object (or human body) is sterilized. The large amount of plasma generated by the discharge gas provided by the additionally arranged gas source is difficult to completely flow out of the gas outlet, so that a large amount of high-activity short-life active nitrogen-oxygen species (O, O2, O3, OH, NO, H2O2, NO2 and the like) in the large amount of plasma are difficult to fully utilize, and the sterilization effect of the low-temperature plasma sterilization equipment is undoubtedly greatly reduced.

In addition, in the current low-temperature plasma sterilization equipment, the plasma flows to the outside through the air outlet of the low-temperature plasma sterilization equipment. In order to provide sufficient active nitrogen and oxygen species, the plasma has to have a sufficiently large flow velocity, so the aperture of the gas outlet is generally small, which results in a small outflow area when the plasma flows out from the gas outlet, and further results in a limited unit sterilization area of the low-temperature plasma sterilization equipment.

In summary, the conventional low-temperature plasma sterilization equipment adopting the dielectric barrier discharge structure has the technical problems of complex structure, high cost, poor sterilization effect and limited unit sterilization area.

Disclosure of Invention

Therefore, it is necessary to provide a plasma sterilization device with simple structure, low cost, good sterilization effect and unlimited unit sterilization area, aiming at the technical problems of complex structure, high cost, poor sterilization effect and limited unit sterilization area of the traditional low-temperature plasma sterilization equipment adopting a dielectric barrier discharge structure.

An embodiment of the present application provides a plasma sterilization apparatus, including:

an insulating housing;

a power electrode comprising an electrode body and a plurality of projecting electrodes, the electrode body being at least partially disposed within the insulative housing; the electrode body is provided with a first surface, the plurality of projecting electrodes are uniformly arranged on the first surface at intervals, and the projecting electrodes project out of the first surface and at least partially extend out of the insulating shell; and

the insulating medium layer comprises a medium body layer and a medium protruding layer protruding out of the medium body layer, the medium body layer covers the first surface, and the medium protruding layer covers the surface of the protruding electrode.

In one embodiment, the first surface is flush with one end of the insulating housing along a first direction; or, the medium body layer is flush with one end of the insulating shell along the first direction;

the first direction is a direction in which the projecting electrode projects from the first surface.

In one embodiment, the protruding electrode is shaped as a truncated cone or a truncated pyramid.

In an embodiment, the dielectric protrusion layer includes a side dielectric layer and an end dielectric layer, the side dielectric layer covers a side surface of the protrusion electrode, and the end dielectric layer covers an end of the protrusion electrode facing away from the electrode body, wherein a thickness of the end dielectric layer is greater than a thickness of the side dielectric layer, and a thickness of the end dielectric layer is greater than a thickness of the dielectric body layer.

In one embodiment, the electrode body has a second surface opposite to the first surface, and the second surface is covered with an insulating layer.

In one embodiment, the plurality of projecting electrodes are divided into at least two electrode units, and each electrode unit comprises a plurality of projecting electrodes which are uniformly arranged at intervals along the circumferential direction;

in two adjacent electrode units, one of the electrode units is arranged around the periphery of the other electrode unit, and any one of the projecting electrodes in the other electrode unit and any one of the projecting electrodes in the one electrode unit are arranged along the circumferential direction in a staggered manner.

In an embodiment, the power electrode further includes a connection electrode, one end of the connection electrode is connected to the electrode body, and the other end of the connection electrode extends to one end of the insulating housing away from the protruding electrode.

In an embodiment, the plasma sterilization device further includes a protruding portion, the protruding portion is disposed at one end of the insulating housing, which is far away from the protruding electrode, and a socket is disposed on the protruding portion, and the socket is used for electrically connecting the other end of the connecting electrode with an ac high-voltage power supply outside the insulating housing.

In one embodiment, the insulating housing includes: the electrode body is positioned in the head, and the handle is connected to one end, far away from the protruding electrode, of the head.

In one embodiment, the plasma sterilization device further comprises an alternating current high voltage power supply for electrically connecting with the power electrode.

In an embodiment, the breakdown voltage resistance of the material used for the insulating dielectric layer is greater than the breakdown voltage resistance of the material used for the insulating shell.

When the plasma sterilization device is used for sterilizing the object to be treated, the medium body layer and the surface of the object to be treated are separated by the medium protrusion layer. When high-voltage alternating current is applied to the power electrode, air in the air gap layer between the medium body layer and the surface of the processed object can be used as discharge gas, and the processed object can be used as a grounding electrode, so that the discharge between the power electrode and the grounding electrode can lead the air in the air gap layer to be broken down to generate plasma, and the generated plasma can directly act on the surface of the processed object to sterilize the processed object, so that active nitrogen oxygen species in the plasma can be fully utilized, and the sterilization effect is good. Because the plurality of projecting electrodes at least partially extend out of the insulating shell, the medium projecting layer coated on the surface of the projecting electrodes at least partially extends out of the insulating shell, and the air gap layer between the medium body layer and the surface of the processed object is at least partially positioned outside the insulating shell. The air around the air gap layer outside the insulating shell is not blocked by the insulating shell, so that the air around the air gap layer outside the insulating shell can be continuously supplemented into the air gap layer to be used as the discharge gas, and further, the sufficient discharge gas can be provided without arranging an additional gas source so as to generate the sufficient active nitrogen-oxygen species, and the structural complexity and the cost of the plasma sterilization device are reduced. As described above, the plasma sterilization apparatus can generate a sufficient amount of active nitrogen and oxygen species, and it can be understood that since sterilization is performed by plasma generated by discharge between the power electrode and the object to be treated, the maximum value of the unit sterilization area of the plasma sterilization apparatus is substantially equal to the area of the first surface of the electrode body, and thus the area of the first surface of the electrode body can be freely designed according to the size of the object to be treated, so as to realize large-area discharge without being limited by the outlet gas diameter of the conventional plasma sterilization apparatus.

Drawings

FIG. 1 is a schematic structural diagram of a plasma sterilization apparatus according to an embodiment;

fig. 2 is a partial position schematic view of a connection structure of the insulating housing and the power electrode in fig. 1;

FIG. 3 is a schematic diagram of the arrangement of the plurality of projecting electrodes in FIG. 1;

fig. 4 is a schematic structural diagram of the plasma sterilization apparatus in fig. 1.

The reference numbers illustrate:

a plasma sterilization device 100;

an insulating case 110; a head portion 111; a handle 112; an insulating connector 113; a surface 1111 of an insulating case at one end in the first direction;

a power electrode 120; an electrode body 121; a first surface 1211; a second surface 1212; the projecting electrode 122; the connection electrode 123; one of the electrode units 122 a; the other electrode unit 122 b;

an insulating dielectric layer 130; a dielectric body layer 131; a dielectric protrusion layer 132; a side dielectric layer 1321; end dielectric layers 1322;

a projection 1121;

an insulating layer 140;

an alternating current high voltage power supply 150;

a high voltage line 160.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1 and 2, a plasma sterilization apparatus 100 is provided according to an embodiment of the present disclosure. The plasma sterilization apparatus 100 includes: insulating housing 110, power electrode 120, and insulating dielectric layer 130.

The insulating housing 110 may be formed by printing through a 3D printing technique or assembled by assembling the components of the insulating housing 110. The material used for the insulating housing 110 may be any one of PLA (polylactic acid) or ABS (acrylonitrile-butadiene-styrene copolymer), or may be other materials. The power electrode 120 includes an electrode body 121 and a plurality of protruding electrodes 122. The electrode body 121 is at least partially disposed within the insulating case 110 such that the power electrode 120 is mounted to the insulating case 110. The electrode body 121 has a first surface 1211. The plurality of projecting electrodes 122 are disposed on the first surface 1211 at regular intervals. The protruding electrode 122 protrudes from the first surface 1211, and the protruding electrode 122 at least partially protrudes out of the insulating housing 110. For convenience of description, a direction in which the protruding electrode 122 protrudes from the first surface 1211 is defined as a first direction YY'. It can be understood that the first surface 1211 faces the first direction YY ', the protruding electrode 122 protrudes from the first surface 1211 along the first direction YY ', and the protruding electrode 122 at least partially protrudes out of the insulating housing 110 along the first direction YY '.

As shown in fig. 2, the insulating dielectric layer 130 includes a dielectric body layer 131 and a dielectric protrusion layer 132. The dielectric body layer 131 covers the first surface 1211 of the electrode body 121. The dielectric protrusion layer 132 protrudes from the dielectric bulk layer 131 along the first direction YY', so that the dielectric protrusion layer 132 can cover the surface of the protrusion electrode 122.

When the plasma sterilization apparatus 100 is used to sterilize an object to be treated (e.g., a medical device), one end of the medium protrusion layer 132 facing away from the medium body layer 131 is placed toward the surface of the object to be treated. Since the medium protrusion layer 132 protrudes from the medium body layer 131, the medium body layer 131 and the surface of the object to be processed are separated by the medium protrusion layer 132, so that an air gap layer is formed between the medium body layer 131 and the surface of the object to be processed.

By using the principle of dielectric barrier discharge, when a high voltage alternating current is applied to the power electrode 120, the air in the air gap layer between the dielectric body layer 131 and the surface of the object to be treated can be used as a discharge gas, and the object to be treated can be used as a ground electrode, so that the discharge between the power electrode 120 and the ground electrode can cause the air in the air gap layer to be broken down to generate plasma, and the generated plasma can directly act on the surface of the object to be treated to sterilize the object to be treated, so that the active nitrogen and oxygen species in the plasma can be fully utilized, and the sterilization effect is good.

Since the plurality of projecting electrodes 122 at least partially extend out of the insulating casing 110, the dielectric projecting layer 132 covering the surface of the projecting electrodes 122 at least partially extends out of the insulating casing 110, and the air gap layer between the dielectric body layer 131 and the surface of the object to be processed is at least partially located outside the insulating casing 110. The air around the air gap layer outside the insulating housing 110 is not blocked by the insulating housing 110, so that the air around the air gap layer outside the insulating housing 110 can be continuously supplemented into the air gap layer as the discharge gas, and further, a sufficient amount of discharge gas can be provided without configuring an additional gas source to generate a sufficient amount of active oxynitride species, thereby reducing the structural complexity and cost of the plasma sterilization apparatus 100.

As described above, the plasma sterilization apparatus 100 can generate a sufficient amount of reactive nitrogen oxygen species, and it can be understood that since sterilization is performed by plasma generated by discharge between the power electrode 120 and the object to be treated, the maximum value of the unit sterilization area of the plasma sterilization apparatus 100 is substantially equal to the area of the first surface 1211 of the electrode body 121, so that the area of the first surface 1211 of the electrode body 121 can be freely designed according to the size of the object to be treated, thereby realizing large-area discharge without being limited by the outlet gas aperture of the conventional plasma sterilization apparatus.

In another embodiment, the plasma sterilization apparatus 100 may be used to sterilize a human body, and when a high voltage ac is applied to the power electrode 120, an air gap layer is formed between the first surface 1211 of the electrode body 121 and the skin surface of the human body, and the human body itself serves as a ground electrode.

Specifically, in the embodiment of the present application, since the plurality of protruding electrodes 122 are uniformly disposed on the first surface 1211 of the electrode body 121 at intervals, the plasma sterilization device 100 can discharge uniformly, so that the plasma generated on the surface of the object to be processed is uniform, and the sterilization effect on the surface of the object to be processed is balanced.

Referring to fig. 2, in an embodiment, the first surface 1211 is flush with a surface 1111 of one end of the insulating housing 110 along the first direction YY', so that it can be understood that the first surface 1211 faces the outside of the insulating housing 110, and the electrode body 121 is completely located inside the insulating housing 110, so as to prevent the electrode body 121 from being exposed outside the insulating housing 110, and further prevent the electrode body 121 from unnecessarily discharging other areas (areas outside the surface of the object to be processed) outside the insulating housing 110.

In addition, since the surface 1111 of one end of the insulating housing 110 along the first direction YY' is flush with the first surface 1211, and the protruding electrode 122 protrudes from the first surface 1211 of the electrode body 121, the protruding electrode 122 can be made to completely extend out of the insulating housing 110 under the condition that the electrode body 121 is not exposed out of the insulating housing 110, so that the thickness of the air gap layer between the first surface 1211 and the surface of the object to be processed is ensured to be sufficiently large under the condition that the electrode body 121 is not exposed out of the insulating housing 110, that is, a sufficient amount of discharge gas can be provided.

In other embodiments, it may also be: the end surface of one end of the insulating shell along the first direction YY' is flush with the surface of the dielectric body layer facing away from the first surface (i.e. the surface of the dielectric body layer facing the first direction), so that the thickness of the air gap layer between the first surface and the surface of the object to be processed can be ensured to be sufficiently large under the condition that the electrode body is not exposed out of the insulating shell.

In another embodiment, the electrode body may also slightly protrude from the end surface of the insulating housing along the first direction, and the electrode body is partially exposed outside the insulating housing.

In yet another embodiment, the electrode body may be further located inside the insulating housing and at a distance from one end of the insulating housing along the first direction, i.e. one end of the insulating housing along the first direction protrudes from the electrode body along the first direction. In this case, the end of the projecting electrode connected to the electrode body is located inside the insulating housing, and the end of the projecting electrode away from the electrode body protrudes outside the insulating housing.

In one embodiment, the projecting electrode 122 is shaped as a truncated cone or pyramid, as shown in fig. 2.

Specifically, it can be understood that, when the plasma sterilization apparatus 100 is used for sterilizing an object to be treated (for example, a medical device), one end of the medium protrusion layer 132, which is opposite to the medium body layer 131, is disposed toward the surface of the object to be treated, and at this time, there is no gap or a small gap between one end of the medium protrusion layer 132, which is opposite to the medium body layer 131, and the surface of the object to be treated, and then there is no gap or a small gap between one end of the protrusion electrode 122, which is opposite to the electrode body 121, and the surface of the object to be treated, so that if the tip discharge of the protrusion electrode 122 does not generate much plasma, it is not necessary to discharge through the tip of the protrusion electrode 122.

And the gap between the electrode body 121 and the surface of the object to be processed is large, and the gap between the root of the projecting electrode 122 (i.e., the end near the electrode body 121) and the surface of the object to be processed is large, so that a large amount of plasma is generated mainly by the discharge at the root of the electrode body 121 and the projecting electrode 122.

Compared with a general conical projecting electrode, in the present embodiment, the projecting electrode 122 is shaped like a circular truncated cone or a truncated pyramid, so that the tip (the end away from the electrode body 121) of the projecting electrode 122 is not excessively sharp, and the tip discharge of the projecting electrode 122 can be weakened or avoided, so as to reduce unnecessary discharge.

In other embodiments, the shape of the projecting electrode may also be cylindrical, such as a cylinder, prism, etc.; alternatively, it may also take on a conical shape, such as a cone, pyramid, etc.; alternatively, the dots may be formed.

Referring to fig. 2, in one embodiment, the dielectric protrusion layer 132 includes a side dielectric layer 1321 and an end dielectric layer 1322. The side dielectric layer 1321 covers the side of the protruding electrode 122, and the end dielectric layer 1322 covers the end (i.e. the tip in this embodiment) of the protruding electrode 122 facing away from the electrode body 121. The thickness of the end dielectric layer 1322 is greater than that of the side dielectric layer 1321, and the thickness of the end dielectric layer 1322 is greater than that of the dielectric body layer 131. Since the thickness of the end dielectric layer 1322 is large, the tip discharge of the projecting electrode 122 can be weakened or avoided as much as possible to reduce the unnecessary discharge phenomenon. Specifically, the thickness of the end dielectric layer 1322 is approximately 1 to 2mm, which is 1 to 2 times the thickness of the side dielectric layer 1321, and may also be 1 to 2 times the thickness of the dielectric body layer 131.

Further, as described above, when the plasma sterilization apparatus 100 is used to sterilize an object to be treated (e.g., a medical device), the end of the medium projection layer 132 facing away from the medium body layer 131 (i.e., the end medium layer 1322) is disposed toward the surface of the object to be treated, and therefore, the end medium layer 1322 is easily worn away by the object to be treated. In this embodiment, by making the thickness of the end media layers 1322 larger, the end media layers 1322 can be made more wear resistant.

Referring to fig. 2, in an embodiment, the electrode body 121 has a second surface 1212 opposite to the first surface 1211, and the second surface 1212 faces the inside of the insulating housing 110. The second surface 1212 is covered with an insulating layer 140, and the insulating layer 140 is used for weakening or preventing the electrode body 121 from discharging into the insulating housing 110, so as to reduce unnecessary discharge phenomenon.

In one embodiment, the electrode body 121 has a second surface 1212 opposite to the first surface 1211, and the second surface 1212 is a plane to reduce unnecessary discharge caused by unevenness of the second surface 1212.

In one embodiment, the plurality of projecting electrodes 122 are divided into at least two electrode units. Each electrode unit includes a plurality of projecting electrodes 122 arranged at regular intervals in a circumferential direction. As shown in fig. 3, the number of electrode units is two in the present embodiment, and in fig. 3, a plurality of projecting electrodes 122 in each circumferential direction constitute one electrode unit.

As shown in fig. 3, one electrode unit 122a is surrounded on the periphery of the other electrode unit 122b, among the two adjacent electrode units. In the present embodiment, the one electrode unit 122a includes ten projecting electrodes 122, and the other electrode unit 122b includes five projecting electrodes 122.

Any one of the projecting electrodes 122 in the other electrode unit 122b and any one of the projecting electrodes 122 in the one electrode unit 122a are arranged in a staggered manner along the circumferential direction, that is: the circumferential position coordinate of any one of the projecting electrodes 122 in the electrode unit 122b is different from the circumferential position coordinate of any one of the projecting electrodes 122 in the electrode unit 122a along the circumferential direction of the electrode units (122a, 122b), so that the phenomenon of discharge attenuation caused by the superposition of electric fields generated by the projecting electrodes 122 in adjacent electrode units can be weakened.

In other embodiments, the number of electrode units may be greater. The number of projecting electrodes in each electrode unit is also not limited to five, ten.

Referring to fig. 1, in an embodiment, the power electrode 120 further includes a connection electrode 123, one end of the connection electrode 123 is connected to the electrode body 121, and the other end of the connection electrode 123 extends to one end of the insulating housing 110 away from the protruding electrode 122. Specifically, in the present embodiment, the connection electrode 123 has a rod shape, so that the space inside the insulating housing 110 is saved.

Since the other end of the connection electrode 123 extends to the end of the insulating housing 110 away from the projecting electrode 122, and thus the other end of the connection electrode 123 is closer to the external space of the side of the insulating housing 110 away from the projecting electrode 122, it is only necessary to connect the other end of the connection electrode 123 to the ac high voltage power supply outside the side of the insulating housing 110, and it is possible to apply the high voltage ac power to the power electrode 120 conveniently.

Referring to fig. 1 in conjunction with fig. 4, in an embodiment, the plasma sterilization apparatus 100 further includes a protrusion 1121. The protrusion 1121 is disposed at one end of the insulating housing 110 away from the protruding electrode 122, and a socket (not shown) is disposed on the protrusion 1121, and is used for electrically connecting the ac high-voltage power supply 150 with the other end of the connecting electrode 123.

Specifically, referring to fig. 4, since the other end of the connection electrode 123 extends to the end of the insulating housing 110 away from the protruding electrode 122, and the protrusion 1121 is disposed at the end of the insulating housing 110 away from the protruding electrode 122, by connecting one end of the high voltage wire 160 with the ac high voltage power supply 150 and inserting the other end into the socket on the protrusion 1121, the high voltage wire 160 can be electrically connected with the connection electrode 123 through the socket, thereby facilitating the electrical connection between the ac high voltage power supply 150 and the connection electrode 123.

Referring to fig. 1 and 4, in an embodiment, the insulating housing 110 includes: a head 111 and a handle 112 connected to the head 111. The head 111 and the handle 112 may be assembled together or may be integrally formed. The electrode body 121 is located within the head 111. Handle 112 is attached to the end of head 111 distal to projecting electrode 122. By arranging the handle 112, the plasma sterilization device 100 can be conveniently held by hand for operation.

Further, in the present embodiment, one end of the connection electrode 123 is located in the head 111, and the other end extends into the handle 112 after passing through the head 111, and extends to one end of the handle 112 away from the head 111. In this embodiment, the end of the handle 112 away from the head 111, i.e. the end of the insulating housing 110 away from the projecting electrode 122, is described above. It can be understood that the other end of the connection electrode 123 is closer to the outside of the handle 112 on the side away from the head 111, and the high voltage ac power can be conveniently applied to the power electrode 120 by simply connecting the other end of the connection electrode 123 to the ac high voltage power supply 150 on the outside of the handle 112 on the side away from the head 111.

Further, in the present embodiment, the insulation housing 110 further includes an insulation connector 113. The head 111 and the handle 112 are connected through an insulating connector 113, so that a desired included angle is formed between the head 111 and the handle 112, thereby facilitating the operation of holding the plasma sterilization device 100 by hand.

In this embodiment, since the protrusion 1121 is disposed at an end of the insulating housing 110 away from the protruding electrode 122, and the handle 112 is connected to an end of the head 111 away from the protruding electrode 111, the protrusion 1121 is disposed at an end of the handle 112 away from the head 111.

Referring to fig. 4, in an embodiment, the plasma sterilization apparatus 100 includes an ac high voltage power supply 150 for electrically connecting to the power electrode 120, so that the plasma sterilization apparatus 100 can be conveniently used in different usage scenarios without searching for another ac high voltage power supply 150. An ac high voltage power supply 150 may be connected to the power electrode 120 via a high voltage line 160.

In other embodiments, the plasma sterilization device may not include the ac high voltage power source, but may find the ac high voltage power source when in use.

In one embodiment, the breakdown voltage of the material used for the insulating dielectric layer 130 is greater than the breakdown voltage of the material used for the insulating housing 110. It is understood that the plasma sterilization apparatus 100 generates plasma by discharging mainly through the breakdown of the insulating dielectric layer 130, and therefore, the material used for the insulating dielectric layer 130 needs to have a sufficient breakdown voltage. The plasma sterilization device 100 does not discharge to the insulating housing 110, so the insulating housing 110 may be made of a common insulating material and have a smaller breakdown voltage. Specifically, the breakdown voltage of the material used for the insulating dielectric layer 130 ranges from 3kV peak voltage to 10kV peak voltage. The material used for the insulating housing 110 may be teflon, polyethylene or polypropylene.

Further, the breakdown voltage of the material used for the protrusion 1121 may also be in a range of 3kV peak voltage to 10kV peak voltage, which is greater than the breakdown voltage of the material used for the insulating case 110, so as to prevent the other end of the connecting electrode 123 from breaking through the protrusion 1121 to discharge, thereby reducing unnecessary discharge.

In one embodiment, the plasma sterilization device 100 further comprises a resistor. The resistor is connected to the power electrode 120 for controlling the discharge current of the power electrode 120 to prevent the risk of electric shock due to too high discharge current.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A plasma sterilization device, comprising:

an insulating housing (110);

a power electrode (120), the power electrode (120) comprising an electrode body (121) and a plurality of projecting electrodes (122), the electrode body (121) being at least partially disposed within the insulating housing (110);

the electrode body (121) is provided with a first surface (1211), the plurality of protruding electrodes (122) are uniformly arranged on the first surface (1211) at intervals, and the protruding electrodes (122) protrude out of the first surface (1211) and at least partially protrude out of the insulating shell (110); and

the insulating medium layer (130) comprises a medium body layer (131) and a medium protruding layer (132) protruding out of the medium body layer (131), the medium body layer (131) covers the first surface (1211), and the medium protruding layer (132) covers the surface of the protruding electrode (122).

2. The plasma sterilization apparatus according to claim 1,

the first surface (1211) is flush with one end of the insulating housing (110) along a first direction (YY'); or, the dielectric body layer (131) is flush with one end of the insulating shell (110) along a first direction (YY');

wherein the first direction (YY') is a direction in which the protruding electrode (122) protrudes from the first surface (1211).

3. Plasma sterilisation apparatus according to claim 1, wherein the projecting electrode (122) is shaped as a truncated cone or a truncated pyramid.

4. The plasma sterilization device according to claim 1, wherein the medium protrusion layer (132) comprises a side medium layer (1321) and an end medium layer (1322), the side medium layer (1321) covers the side surface of the protrusion electrode (122), and the end medium layer (1322) covers the end of the protrusion electrode (122) facing away from the electrode body (121), wherein the thickness of the end medium layer (1322) is greater than that of the side medium layer (1321), and the thickness of the end medium layer (1322) is greater than that of the medium body layer (131).

5. Plasma sterilisation apparatus according to claim 1, wherein the electrode body (121) has a second surface (1212) opposite the first surface (1211), the second surface (1212) being covered with an insulating layer (140).

6. The plasma sterilization apparatus according to claim 1,

the plurality of projecting electrodes (122) are divided into at least two electrode units, and each electrode unit comprises a plurality of projecting electrodes (122) which are uniformly arranged at intervals along the circumferential direction;

one of the two adjacent electrode units (122a) is arranged around the periphery of the other electrode unit (122b), and any one of the projecting electrodes (122) in the other electrode unit (122b) and any one of the projecting electrodes (122) in the one electrode unit (122a) are arranged in a staggered manner along the circumferential direction.

7. The plasma sterilization apparatus according to claim 1, wherein the power electrode (120) further comprises a connection electrode (123), one end of the connection electrode (123) is connected with the electrode body (121), and the other end of the connection electrode (123) extends to one end of the insulating housing (110) away from the protruding electrode (122).

8. The plasma sterilization device according to claim 7, further comprising a protrusion (1121), wherein the protrusion (1121) is disposed at one end of the insulating housing (110) away from the protruding electrode (122), and a socket is disposed on the protrusion (1121) and is used for electrically connecting the other end of the connection electrode (123) with an alternating current high voltage power supply (150) outside the insulating housing (110).

9. Plasma sterilisation apparatus according to claim 1, 7 or 8, wherein the insulating housing (110) comprises: a head (111) and a handle (112), the electrode body (121) being located within the head (111), the handle (112) being connected to an end of the head (111) remote from the projecting electrode (122).

10. The plasma sterilization apparatus according to claim 1,

the plasma sterilization device also comprises an alternating current high-voltage power supply (150) which is electrically connected with the power electrode (120); and/or the presence of a gas in the gas,

the breakdown voltage resistance of the material adopted by the insulating medium layer (130) is larger than that of the material adopted by the insulating shell (110).