CN111770623A - A plasma air sterilization and disinfection equipment - Google Patents

Abstract

The invention discloses plasma air sterilization and disinfection equipment, which comprises a plasma generating device and a nanosecond high-voltage pulse power supply; the plasma generating device is arranged in the air outlet pipeline and comprises a high-voltage electrode, a dielectric layer and a low-voltage electrode. The nanosecond high-voltage pulse provided by the nanosecond high-voltage pulse power supply can enable a medium between the low-voltage electrode and the medium layer to block surface discharge, so that plasma and ultraviolet light are generated, a large number of high-energy electrons, active ions, high-energy free radicals and other components contained in the plasma are easy to chemically react with proteins and nucleic acids in bacteria, molds, spores and viruses, and can destroy microorganisms and disturb the survival function of the microorganisms, so that various microorganisms die. Fresh air from the fresh air pipeline is sterilized and disinfected by the plasma and the ultraviolet light, and then is sent into the air outlet pipeline by the air feeder and is output. The equipment has the characteristics of good disinfection effect, high efficiency, simple process, no secondary pollution, low operation cost, convenient operation and the like.

Description

A plasma air sterilization and disinfection equipment

technical field

The invention relates to the technical field of air sterilization and disinfection, in particular to a plasma air sterilization and disinfection equipment.

Background technique

At present, central air conditioners are widely used in large shopping malls, large hotels, office buildings and large hospital office environments. Bacteria and viruses will survive and multiply in long-term operation, especially in the period of high incidence of influenza virus, and a large number of bacteria and viruses will multiply in ventilation pipes that have been in operation for many years. Circulating in the air, it seriously affects human health. Generally, there are many people in the places where the central air conditioner is used, especially in the public places that are open to the outside world, and the identity of the people is unknown. Bacteria and viruses in the air can easily cause cross-infection of bacteria through the ventilation system of the central air conditioner, causing indoor environmental pollution and bringing a variety of diseases to more people. However, due to the complex structure of the central air conditioner's pipeline and the small space, it is difficult for people to directly enter and clean it. Even if the fresh air system is turned on, it is difficult to ensure the elimination of bacteria and viruses. Therefore, in order to prevent and control the spread of bacteria and viruses in local spaces, centralized and unified disinfection is required, and there is an urgent need for centralized and unified sterilization and disinfection equipment for central air-conditioning fresh air systems.

In recent years, my country has carried out a lot of research work on air sterilization and disinfection, and there are many types of air disinfection methods and technologies. Traditional physical and chemical disinfection is prone to secondary air pollution and certain toxic and side effects. Although chemical disinfectants, ultraviolet and ozone disinfection devices can effectively kill the above-mentioned bacteria and viruses, they require a certain disinfection time and cannot kill bacteria and viruses instantly; and the ultraviolet lamp must directly irradiate the surface of the disinfection object, and can only be used when no one is in the room. Disinfection should be carried out under certain circumstances, otherwise the ultraviolet rays will seriously endanger the human body, especially the eyes. Therefore, it is also necessary to develop an instant and real-time sterilization and disinfection device.

Plasma technology is a fast and green sterilization technology and is considered to be one of the most promising technologies. Plasma is the fourth state of matter in addition to the three states of gas, liquid and solid. It is a mixture of atoms, ions, electrons, free radical particles, etc. formed by ionization under the action of high voltage. These ions and uncharged particles can either release photons or collide with each other during the transition from an excited state to a ground state, causing a chemical reaction. Plasma discharge can produce different forms of physical and chemical reactions, which can produce some oxidizing particles, including reactive free radicals, oxidizing molecules, and ultraviolet light. In recent years, the rise of plasma chemistry in the field of environmental protection has attracted the attention of researchers. The mechanism of plasma sterilization usually includes the destruction of nucleic acid by ultraviolet rays, the bombardment of cells by charged particles and high-energy electrons, the electroporation of cells, the reaction between active particles and biological macromolecules, and the oxidation of reactive oxygen species. result. However, the existing devices using plasma discharge sterilization and disinfection have a small processing capacity, which cannot meet the needs of industrial applications. The use of high-frequency AC power makes the discharge reactor seriously heat, and there are defects such as low energy efficiency of the power supply and weak load capacity of the power supply. .

SUMMARY OF THE INVENTION

In order to solve the above problems existing in the air sterilization and disinfection of the central air-conditioning ventilation system, the present invention proposes a device for deep air sterilization and disinfection treatment of the central air-conditioning ventilation system with high efficiency, simplicity and no secondary pollution. Pulse discharge plasma can not only achieve instant and real-time sterilization and disinfection, but also has the characteristics of good disinfection effect, compact structure and convenient operation.

For achieving the above object, the present invention provides the following scheme:

The invention provides a plasma air sterilization and disinfection equipment, comprising a plasma generating device and a nanosecond-level high-voltage pulse power supply; the plasma generating device is arranged in an air outlet pipe, and includes a high-voltage and a nanosecond-level high-voltage pulse power supply. a high-voltage electrode connected to an end, a dielectric layer sleeved outside the high-voltage electrode, and a low-voltage electrode connected to a low-voltage end of the nanosecond high-voltage pulse power supply, the low-voltage electrode is disposed outside the dielectric layer; the The nanosecond high voltage pulse provided by the nanosecond high voltage pulse power supply can generate dielectric barrier creeping discharge between the low voltage electrode and the dielectric layer, thereby generating plasma and ultraviolet light. The plasma includes atoms, ions, electrons, free Active substances such as base particles. The plasma generator is driven by a nanosecond high-voltage pulse power supply to generate low-temperature plasma and ultraviolet light, and the active substances such as atoms, ions, electrons, and free radical particles formed by the discharge plasma are used to sterilize the air containing bacteria and viruses, so as to achieve The purpose of purifying the air.

Optionally, the plasma generating device is a fence structure reactor composed of an array of creeping pulse discharge ceramic tubes. The fence structure reactor can be directly installed inside the air outlet duct of the central air-conditioning ventilation system.

Optionally, in the fence structure reactor, the high voltage electrode is a stud high voltage electrode.

Optionally, a ceramic sleeve is sleeved on the outer layer of the stud high-voltage electrode as the dielectric layer.

Optionally, a metal wire is wound around the ceramic sleeve to form a metal wire wound low-voltage electrode.

Optionally, the metal wire is spirally wound around the metal wire of the low-voltage electrode.

Optionally, the fence structure reactor includes a fixed bracket, and the discharge ceramic tube array is fixed between the two fixed brackets. The fixing bracket can be fixed inside the air outlet duct of the ventilation system.

Optionally, the fixing bracket is a nylon fixing frame.

Optionally, in the discharge ceramic tube array, the number of arrayed ceramic tubes is 4×5, and the distance between adjacent ceramic tubes is 30 mm, which will not hinder the air flow inside the pipes of the ventilation system.

The present invention has achieved the following technical effects with respect to the prior art:

In the plasma air sterilization and disinfection equipment proposed by the present invention, the high-voltage electrode is connected to the high-voltage end of the nanosecond-level high-voltage pulse power supply, the low-voltage electrode is connected to the low-voltage end of the nanosecond-level high-voltage pulse power supply, and the nanosecond-level high-voltage pulse can make the low-voltage electrode A dielectric barrier discharge is generated between the dielectric layer and plasma and ultraviolet light. Plasma contains a large number of high-energy electrons, active ions, high-energy free radicals and other components, which can easily chemically react with bacteria, molds, spores, and proteins and nucleic acids in viruses, which can destroy microorganisms and disrupt the survival function of microorganisms. When microorganisms die, negative ions can adsorb suspended particles dozens of times larger than their own weight, remove suspended colloids (aerosols) in the air, destroy nucleic acids by ultraviolet light, bombard cells with charged particles and high-energy electrons, electroporation of cells, activity The comprehensive effects of the reaction between particles and biological macromolecules and the oxidation of reactive oxygen species can all achieve the effect of purifying and disinfecting the air.

The plasma reactor of the fence structure in the present invention can be directly connected to the air outlet duct of the central air-conditioning ventilation system, and the fresh air from the fresh air duct passes through the fence structure composed of the surface pulse discharge ceramic tube array, and the plasma and ultraviolet rays generated by the discharge ceramic tube array After light sterilization and disinfection, it is sent into the air outlet duct through the air blower and output, and has the characteristics of good disinfection effect, high efficiency, simple process, no secondary pollution, low operating cost, and convenient operation. The invention makes full use of the pipes of the existing central air-conditioning ventilation system, has small engineering changes, compact equipment structure and strong practicability.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some of the present invention. In the embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is the structural representation of the plasma generation device in the plasma air sterilization and disinfection equipment of the present invention;

Fig. 2 is a top view of the plasma generating device in Fig. 1;

Fig. 3 is the installation schematic diagram of the plasma air sterilization and disinfection equipment of the present invention in the central air conditioner;

Wherein, the reference signs are: 1. Plasma generating device; 2. Nanosecond high-voltage pulse power supply; 3. Stud bolt high-voltage electrode; 4. Ceramic sleeve; 5. Wire wound low-voltage electrode; 6. Fixed bracket; 7. Fresh air duct.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below 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, but not 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.

The purpose of the present invention is to provide a plasma air sterilization and disinfection equipment. The power supply adopts nanosecond high-voltage pulse power supply. Sterilization and disinfection rate of air containing bacteria and viruses; during continuous operation, the plasma generating device generates less heat, and the energy efficiency of the power supply is high, which effectively reduces the cost of sterilization and disinfection.

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

Example 1:

As shown in FIGS. 1 and 2 , the present embodiment provides a plasma generating device 1 for generating plasma by nanosecond high-voltage electric pulse discharge. The plasma generating device is a fence structure reactor composed of a discharge ceramic tube array. It includes a ceramic sleeve 4 , a wire wound low-voltage electrode 5 , a stud bolt high-voltage electrode 3 and a fixing bracket 6 . The nanosecond high-voltage pulse power supply 2 is respectively connected to the stud high-voltage electrode 3 and the wire-wound low-voltage electrode 5 of the plasma discharge fence structure reactor, and drives the medium to discharge along the surface to generate plasma.

In this embodiment, as shown in Figure 1, each discharge ceramic tube in the fence structure reactor uses a stud electrode as a high-voltage electrode, both ends are threaded, and one end is in phase with the high-voltage end of the nanosecond high-voltage pulse power supply. connection, the other end can be fixed on the fixed bracket. The outer layer of the high-voltage electrode is covered with a ceramic sleeve 4 as a dielectric layer for dielectric blocking creepage discharge. The metal wire wound electrode wound outside the ceramic sleeve 4 is used as a low voltage electrode, and the metal wire wound low voltage electrode 5 is connected to the low voltage end of the nanosecond high-voltage pulse power supply 2 . The nanosecond high voltage pulse provided by the nanosecond high voltage pulse power supply can make the metal wire wound between the low voltage electrode 5 and the ceramic sleeve 4 to generate dielectric barrier creeping discharge plasma, and generate active substances such as atoms, ions, electrons, and free radical particles. .

In this embodiment, as shown in FIG. 1 , the low-voltage electrode 5 is wound around the low-voltage electrode 5 by using the dielectric barrier discharge of the nanosecond-level high-voltage electric pulse power supply to generate active radicals, and is tightly wound around the ceramic sleeve 4 and fixed with the terminals at both ends. . The ceramic sleeve 4 that generates active radicals such as ozone by dielectric barrier discharge tightly wraps the inner stud high-voltage electrode 3 and is fixedly connected to the fixing bracket 6 at the same time.

In this embodiment, the metal wire is wound around the low-voltage electrode 5 and is spirally wound on the outer surface of the ceramic sleeve 4 with an insulated wire; the diameter of the insulated wire is preferably 1 mm, and the pitch of the spiral winding is preferably 5 mm. Compared with the conventional coaxial electrode, the low-voltage discharge electrode is wound with metal wire, which is easier to generate micro-discharge, and can increase the effective area of the micro-discharge, so that the entire outer wall of the ceramic sleeve 4 wound by the insulated wire can generate the micro-discharge.

In this embodiment, the length of the stud high-voltage electrode 3 is preferably 560 mm, and the diameter is preferably 3 mm; and the diameter of the high-voltage electrode matches the inner diameter of the ceramic sleeve 4 , so that the high-voltage electrode and the ceramic sleeve 4 can be closely matched.

In this embodiment, the inner diameter of the ceramic sleeve 4 is preferably 3 mm, the outer diameter is preferably 6 mm, and the length is preferably 500 mm.

In this embodiment, as shown in Figures 1-3, both ends of the discharge ceramic tube array are fixedly connected to the fixing bracket 6, and the fixing bracket 6 is used to fix the fence structure composed of the discharge ceramic tube array to the fresh air duct of the central air-conditioning ventilation system 7 inside. Among them, the fixing bracket 6 is preferably a nylon plate structure, the thickness is preferably 15mm, and the length×width is preferably 180mm×200mm. There is no special requirement for the specific size of the fixing bracket, and a product well known to those skilled in the art can be used and can satisfy the positional relationship between the installation of the fixed ceramic pipe and the fixing on the ventilation duct.

In this embodiment, as shown in FIG. 2 , in the discharge ceramic tube array, the number of arrayed ceramic tubes is preferably 4×5, and the distance between adjacent ceramic tubes is preferably 30 mm, which will not hinder the air flow inside the pipes of the ventilation system. .

The plasma generated by the fence structure reactor contains a large number of high-energy electrons, active ions, high-energy free radicals and other components, which are very easy to chemically react with bacteria, molds, spores, and proteins and nucleic acids in viruses, which can destroy microorganisms and disrupt microorganisms. Survival function, make all kinds of microorganisms die, negative ions can absorb suspended particles dozens of times larger than their own weight, remove suspended colloids (aerosols) in the air, damage to nucleic acids by ultraviolet light, bombardment of cells by charged particles and high-energy electrons, The electroporation of cells, the reaction between active particles and biological macromolecules, the oxidation of reactive oxygen species, etc., the above-mentioned series of comprehensive effects can achieve the effect of purifying and disinfecting the air. The plasma reactor of the fence structure is directly connected to the fresh air duct 7 of the central air-conditioning ventilation system. The fresh air from the fresh air duct passes through the fence structure composed of the pulse discharge ceramic tube array along the surface, and is sterilized by the plasma and ultraviolet light generated by the discharge ceramic tube array. It is sent into the air outlet duct through the blower and output.

It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. . Therefore, the embodiments are to be regarded in all respects as illustrative and not restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, which are therefore intended to fall within the scope of the appended claims. All changes that come within the meaning and scope of equivalents of , are intended to be embraced within the invention, and any reference signs in the claims shall not be construed as limiting the involved claim.

In the present invention, specific examples are used to illustrate the principles and implementations of the present invention, and the descriptions of the above embodiments are only used to help understand the method and the core idea of the present invention; There will be changes in the specific implementation manner and application scope of the idea of the invention. In conclusion, the contents of this specification should not be construed as limiting the present invention.

Claims (9)

1. a plasma air sterilization and disinfection equipment, is characterized in that: comprise plasma generating device and nanosecond high-voltage pulse power supply; A high-voltage electrode connected to the high-voltage end of the high-voltage pulse power supply, a dielectric layer sleeved outside the high-voltage electrode, and a low-voltage electrode connected to the low-voltage end of the nanosecond high-voltage pulse power supply, the low-voltage electrode is disposed on the dielectric layer The nanosecond-level high-voltage pulse provided by the nanosecond-level high-voltage pulse power supply can generate dielectric barrier creeping discharge between the low-voltage electrode and the dielectric layer, thereby generating plasma and ultraviolet light. 2 . The plasma air sterilization and disinfection equipment according to claim 1 , wherein the plasma generating device is a fence structure reactor composed of an array of creeping pulse discharge ceramic tubes. 3 . 3 . The plasma air sterilization and disinfection equipment according to claim 2 , wherein: in the fence structure reactor, the high-voltage electrode is a stud high-voltage electrode. 4 . 4 . The plasma air sterilization and disinfection equipment according to claim 3 , wherein the outer layer of the stud high-voltage electrode is sleeved with a ceramic sleeve as the medium layer. 5 . 5 . The plasma air sterilization and disinfection device according to claim 4 , wherein the ceramic sleeve is wound with a metal wire to form a metal wire wound low-voltage electrode. 6 . 6 . The plasma air sterilization and disinfection equipment according to claim 5 , wherein the metal wire is spirally wound around the metal wire of the low-voltage electrode. 7 . 7 . The plasma air sterilization and disinfection equipment according to claim 2 , wherein the fence structure reactor comprises a fixed bracket, and the discharge ceramic tube array is fixed between the two fixed brackets. 8 . 8 . The plasma air sterilization and disinfection equipment according to claim 7 , wherein the fixing bracket is a nylon fixing bracket. 9 . 9 . The plasma air sterilization and disinfection equipment according to claim 2 , wherein in the discharge ceramic tube array, the number of arrayed ceramic tubes is 4×5, and the distance between adjacent ceramic tubes is 30 mm. 10 .

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