CN217527268U - Venturi tube and device for plasma activated water generation - Google Patents

Abstract

The invention belongs to the field of disinfection and sterilization, and particularly relates to a Venturi tube and a device for generating plasma activated water, which comprise an electrode structure and a Venturi tube body, wherein the Venturi tube body comprises an inlet section, a throat section and a diffusion section; the throat pipe section is provided with an air inlet, two ends of the throat pipe section are respectively connected with the inlet section and the diffusion section to form a pressure difference structure, and the pressure difference structure is used for generating bubbles and generating cavitation effect on liquid operation; the electrode structure is used for ionizing gas in the bubbles to generate plasma, and the energy generated by the cavitation effect is utilized to activate the liquid.

Description

Venturi tube and device for plasma activated water generation

Technical Field

The invention belongs to the field of disinfection and sterilization, and particularly relates to a venturi tube and a device for plasma activated water generation.

Background

Most plasma disinfection devices disinfect by ionizing gas-phase substances to generate plasma, so that the generated plasma active substances have short service life and extremely small coverage, only act on air near the disinfection device, or contact a plasma generation area of the disinfection device with microorganisms on the surface of an object to realize local object surface disinfection. The activated water is water after low-frequency resonance, contains a large amount of active substances, and has a very strong disinfection effect on air and pathogens on the object surface. It is therefore necessary to explore plasma activated water technology, to generate and store water containing active substances, and to achieve efficient disinfection of air and surfaces by atomized spray technology.

In the patent of plasma activated water with publication number CN107406280a, the plasma part is suspended on the liquid surface, the diffusion distance of active substances is short, and the generation efficiency of activated water is low, and in the patent of plasma activated water with publication number CN113993262A, the control method and the cleaning equipment thereof, the problems of high ionization difficulty, high energy requirement and the like exist, the generation of large-area plasma is difficult, and certain harm is brought by spark discharge. Compared with the plasma gas-liquid mixed phase discharge, the plasma gas-liquid mixed phase discharge method has the advantages that the gas is easy to puncture and the bubbles are broken to provide an ionization path, and the like, and is beneficial to reducing the generation voltage of the activated water and improving the generation efficiency.

The Venturi tube device can generate a large number of micro bubbles in the liquid phase fluid, is beneficial to generating a gas discharge passage in the liquid phase fluid, has a structural foundation for gas-liquid mixed phase discharge and high-efficiency generation of activated water, provides an activated water circulating device on the basis, and prolongs the storage life of the activated water.

Disclosure of Invention

In order to solve the problem, the utility model provides a venturi and device that are used for plasma activated water to take place.

In a first aspect, the present invention provides a venturi tube for plasma activated water generation, comprising an electrode structure and a venturi tube body, wherein the venturi tube body comprises an inlet section, a throat section and a diffuser section; the throat pipe section is provided with an air inlet, two ends of the throat pipe section are respectively connected with the inlet section and the diffusion section to form a pressure difference structure, and the pressure difference structure is used for generating bubbles and generating cavitation effect on liquid operation; the electrode structure is used for ionizing gas introduced into the bubble or the gas inlet to generate plasma, and the energy generated by the cavitation effect is utilized to activate the liquid.

Furthermore, the inlet section and the diffuser section are both of two-section structures, each two-section structure is formed by connecting a cylindrical round port with a conical big round port, two ends of the throat section are respectively connected with conical small round ports, and a cylindrical air inlet is arranged outside the throat section.

Further, the electrode structure includes a first needle electrode and a second needle electrode, the first needle electrode is disposed inside the inlet section, and the second needle electrode is disposed inside the diffuser section.

Further, the electrode structure comprises a plate electrode and an array needle electrode; the plate electrode is arranged inside the left half parts of the inlet section and the throat section, and the array needle electrode is arranged inside the diffusion section.

Further, the electrode structure comprises a metal sleeve electrode and a metal cone; the metal sleeve electrode is arranged at the periphery of the Venturi tube, and a layer of insulating sleeve is covered at the periphery of the metal sleeve electrode; the metal cone is arranged inside the diffusion section, and an insulating fixing buckle is arranged at the right end opening of the diffusion section.

In a second aspect, based on the venturi tube designed in the first aspect, the utility model provides a device for generating plasma activated water, which comprises an atomization device, a high-voltage power supply, an air pump, a water pump, a venturi tube and a water tank; a liquid level meter is arranged inside the water tank, the liquid level meter is connected with a control module, and the water tank is connected with a water pump through a guide pipe; the water pump is connected with the inlet section of the Venturi tube; the throat pipe section of the Venturi pipe is connected with an air pump, and a one-way valve is arranged in the connecting channel; the electrode structure of the Venturi tube is connected with a high-voltage power supply; the atomization device is provided with an activated water parameter sensing module.

Further, the atomizing device is connected with the diffusion section of the venturi tube.

Furthermore, a first electromagnetic valve is arranged in a guide pipe connecting the water pump and the water tank, and the first electromagnetic valve is also connected with the diffusion section of the Venturi tube; and a second electromagnetic valve is arranged in a connecting channel between the water pump and the inlet section of the Venturi tube, and the second electromagnetic valve is also connected with the atomizing device.

The utility model has the advantages that:

the utility model relates to a multiple venturi structure, adopt the cavitation effect of the pressure differential realization water of venturi choke section, thereby generate a large amount of microbubbles, through set up the electrode structure in venturi, adopt air or the inside air of microbubble that high-voltage discharge's form ionization air inlet introduced, form the gas-liquid mixed phase discharge path, utilize the production of microbubble simultaneously, the inflation and a large amount of energy of breaking the in-process and producing, reduce activated water overvoltage, improve the emergence efficiency, produce the hydrogen peroxide of dissolving in aqueous, ozone, contain the oxygen radical, active material such as active ion, make liquid possess the efficiency that the germ disappears, and has the advantages of simple equipment, small floor area, low energy consumption, high preparation efficiency.

In order to satisfy the high-efficient preparation of activated water under the different application conditions, the utility model provides a multiple electrode structure. By applying various energy forms such as direct current high voltage, pulse high voltage, alternating current high voltage and the like, a high-strength electric field is generated between electrodes (namely at a throat of a Venturi tube structure), so that ionization of a micro-bubble discrete phase and a liquid mobile phase is realized, and activated water containing a large amount of active substances is generated.

Combine the utility model provides an activation water generating device that venturi obtained has the characteristics that preparation efficiency is high, can also spout activation water through atomizing device, realizes the disinfection effect of disinfecting by a large scale, increases activation water parameter sensing module simultaneously, and balanced three kinds of activation water performance parameters, oxidation reduction potential, pH value and conductivity promptly, the activity value of real time monitoring activation water, the preparation process is visual, more is of value to the use of activation water.

The plasma activated water disinfection technology has the principle advantages in the aspects of existing forms, action modes and the like. Substances in the activated water can be fully mixed with microorganisms and aerosol thereof, and the disinfection effect is achieved through a complex and rich biochemical reaction system; the activated water technology can be combined with ultrasonic atomization, high-speed airflow atomization, electrostatic atomization and other modes, so that liquid active substances are actively released in micro-nano water mist, and the simultaneous disinfection of air microorganisms and surface microorganisms is realized.

Drawings

FIG. 1 is a schematic diagram of a venturi tube according to the present invention;

FIG. 2 is a diagram of a venturi structure employing a first needle electrode and a second needle electrode in accordance with an embodiment of the present invention;

FIG. 3 is a diagram of a venturi structure using a plate electrode and an array pin electrode according to an embodiment of the present invention;

FIG. 4 is a diagram of a venturi structure using a metal sleeve electrode and a metal cone according to an embodiment of the present invention;

FIG. 5 is a diagram of a micro flow channel structure of a venturi according to an embodiment of the present invention;

fig. 6 is a block diagram of an apparatus for plasma activated water generation in accordance with an embodiment of the present invention;

fig. 7 is a block diagram of another apparatus for plasma activated water generation in accordance with an embodiment of the present invention;

FIG. 8 is a graph of the number of cycles versus hydrogen peroxide concentration for an embodiment of the present invention;

FIG. 9 is a graph of the number of cycles versus the oxidation-reduction potential ORP for an embodiment of the present invention;

wherein: 1-inlet section, 2-throat section, 3-diffusion section, 21-first needle electrode, 22-second needle electrode, 31-plate electrode, 32-array needle electrode, 41-insulating pipe sleeve, 42-metal sleeve electrode, 43-metal needle electrode, 44-insulating fixing buckle, 51-top insulating layer, 52-quartz-based Venturi structure microchannel, 53-bottom insulating layer, 54-electrode structure, 81-first electromagnetic valve, 82-second electromagnetic valve, 201-air inlet, 100-liquid, 200-gas, 300-bubble, 400-high-voltage power supply, 500-atomization device, 600-water pump and 700-air pump.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

A venturi for plasma activated water generation comprising an electrode structure and a venturi body, said venturi body comprising an inlet section, a throat section and a diffuser section; the throat pipe section is provided with an air inlet, two ends of the throat pipe section are respectively connected with the inlet section and the diffusion section to form a pressure difference structure, and the pressure difference structure is used for generating bubbles and generating cavitation effect on liquid operation; the electrode structure is used for ionizing gas in the bubbles to generate plasma, and the energy generated by the cavitation effect is utilized to activate the liquid.

In one embodiment, as shown in FIG. 1, the venturi body comprises an inlet section 1, a throat section 2 and a diffuser section 3 connected in series; the inlet section 1 and the diffuser section 3 are both two-section structures, the two-section structure is formed by connecting a cylindrical round port with a conical large round port, two ends of the throat section 2 are respectively connected with a conical small round port, a cylindrical air inlet 201 is arranged outside the throat section 2, and external air 200 is sucked into the air inlet 201.

The inlet inclination angle alpha of the inlet section 1 is 1-25 degrees, the diameter D of the port of the throat section 2 is 0.1-10 mm, the outlet inclination angle beta of the diffuser section 3 is 5-15 degrees, the diameter D of the outer port of the diffuser section 3, namely the diameter D of the cylindrical round port in the two-section structure is 5-50 mm, and the air inlet 201 arranged outside the throat section 2Port direct d _g 0.5-6 mm, and the length l of the throat section 2 is 1-20 mm.

Liquid flows in from the inlet section 1, flows out from the diffusion section 3 after passing through the throat section 2, one end of the throat section 2 contracts, the other end of the throat section 2 diffuses, so that a pressure difference structure is formed at the two ends, the pressure difference structure enables the liquid to generate a large number of micro bubbles, and a large amount of energy is concentrated in the generation, development and rupture processes of the bubbles.

If the Venturi tube is used for preparing the high-efficiency, quick and large-flux activated water, the Venturi tube can be made into a thin-wall quartz cylinder structure; if the venturi tube is used in miniaturized, portable, and instant-manufacturing and instant-using application scenarios, the venturi tube can be made into a miniaturized on-chip micro-channel structure or an MEMS micro-channel structure.

In one embodiment, as shown in fig. 5, the venturi tube is made into a micro-channel structure, and includes a bottom insulating layer 53, a quartz-based venturi structure micro-channel 52 and a top insulating layer 51, which are connected in sequence, an electrode structure 54 is provided in the venturi tube, the quartz-based venturi structure micro-channel 52 includes an inlet section, a throat section and a diffuser section which are communicated, and a hole is punched outward in the middle of the throat section towards the top insulating layer 51 to form an air inlet, which is beneficial for the venturi micro-channel structure to generate micro-bubble groups. The bottom layer insulating layer 53 is a quartz insulating layer with the thickness of 1mm, the electrode is deposited on the surface of the quartz insulating layer in the modes of sputtering, thermal evaporation and the like, the thickness is 200-1000 nm, and a nano material can be selected; the quartz-based venturi-structured microchannel 52 is quartz-based prepared by a wet etching method; the top insulating layer 51 is a quartz insulating cover plate, and a voltage is applied to the electrode structure, and a plasma can be generated by using the fine bubbles, so that activated water can be obtained.

The electrode structure is arranged in the Venturi tube for generating the plasma activated water, the electrode structure is connected with a power supply to carry out high-voltage discharge, so that gas in the bubbles is ionized to generate plasma, and a large amount of energy in the generation, development and rupture processes of the micro bubbles can be further utilized to generate the plasma activated water containing active substances such as hydrogen peroxide, ozone, nitrate ions, nitrite ions and the like, so that the germ disinfection of the air and the surface of an object is realized.

The pH value range of the plasma activated water is 1-5, and sodium hydroxide can be added to calibrate the pH value according to an application scene so as to enable the pH value to be in the range of 4-10. The electric conductivity of the plasma activated water is 500-10000us/cm, and the oxidation-reduction potential is 150-500mV.

In an embodiment, as shown in fig. 2, the electrode structure comprises a first needle electrode 21 and a second needle electrode 22, said first needle electrode 21 being arranged inside the inlet section and said second needle electrode 22 being arranged inside the diffuser section. And applying direct current voltage on the electrode structure so as to generate high-strength electrostatic fields at the throat pipe section and the diffusion section. When the flow rate of the liquid 100 is 5slm, micron-sized bubbles 300 are generated at the right end of the throat section and the left end of the diffuser section. The air inside the bubbles 300 is ionized under the action of the high-strength electrostatic field to generate active substances such as electrons, metastable particles, positive and negative ions and the like. The internal air generated in the liquid 100 is driven by the flow of the liquid 100, and the ionized bubbles 300, namely, the active substances in the bubble discrete items are fully mixed with the liquid continuous phase, and the bubble discrete items are gradually combined or split along with the flow process of the liquid, so that the activation of the liquid phase is realized to the maximum extent. Alternatively, a sinusoidal ac voltage can be applied across the electrode structure to generate a water-induced cavitation plasma jet between the electrodes to activate the liquid phase.

In one embodiment, as shown in fig. 3, the electrode structure includes a plate electrode 31 and an array pin electrode 32; the plate electrode 31 is disposed inside the left half of the inlet and throat sections and the array pin electrode 32 is disposed inside the diffuser section. The array needle electrode 32 can be a metal needle array, a metal capillary array, a microstructure array prepared by an MEMS method, a nanostructure array, etc. By applying different forms of power to the electrode structure, a dc electrostatic field or an ac electric field is generated.

In one embodiment, as shown in fig. 4, the electrode structure includes a metal cannula electrode 42 and a metal cone; the metal sleeve electrode 42 is arranged on the periphery of the Venturi tube, and the periphery of the metal sleeve electrode 42 is covered with a layer of insulating sleeve 41; the metal cone is arranged inside the diffusion section, and an insulating fixing buckle 44 is arranged at the right end opening of the diffusion section.

Specifically, the metal cone may be a metal needle electrode 43 or a metal rod electrode.

The device for generating plasma activated water by using the venturi tube designed by the utility model is shown in fig. 6 and comprises an atomizing device 500, a high voltage power supply 400, an air pump 700, a water pump 600, the venturi tube and a water tank; a liquid level meter is arranged inside the water tank, the liquid level meter is connected with a control module, and the water tank is connected with the water pump 600 through a guide pipe; the water pump 600 is connected with the inlet section of the venturi tube; the throat section of the venturi tube is connected with the air pump 700, and a one-way valve is arranged in the connecting channel; the electrode structure of the venturi tube is connected with a high voltage power supply 400; the atomizing device 500 is connected with the diffuser section of the venturi tube, and the atomizing device 500 is provided with an activated water parameter sensing module.

Specifically, the control module is also connected with the atomization device, the high-voltage power supply, the water pump and the air pump respectively to perform corresponding control processing; such as the sequence of switching of the devices, the alternating on/off of the water and air pumps, etc.

Specifically, the activated water parameter sensing module is used for monitoring and displaying three activated water performance parameters, namely oxidation-reduction potential, pH value and conductivity; when the oxidation-reduction potential of the activated water is more than 150mV, the pH value is less than 5, and the conductivity is more than 500us/cm, the activated water is considered to have the disinfection capacity;

balancing the weight proportion of the three activated water performance parameters, defining an activity value and an activity threshold value A, displaying the current activity value in an activated water parameter sensing module, and transmitting the current activity value to a control module for evaluating the disinfection capacity of the current activated water; if the activity value is less than or equal to the activity threshold value A, the control module considers that the disinfection capacity is insufficient and cannot start the atomization spraying function of the atomization device; if the activity value is higher than A, the control module considers that the disinfection capacity is achieved, and the atomization spraying function of the atomization device is started.

Specifically, the high voltage power supply is 5kV to 10kV.

In one embodiment, another apparatus for plasma-activated water generation, as shown in fig. 7, includes an atomizing device 500, a high voltage power supply 400, an air pump 700, a water pump 600, a venturi tube, and a water tank; a liquid level meter is arranged inside the water tank, the liquid level meter is connected with a control module, and the water tank is connected with the water pump 600 through a guide pipe; the water pump 600 is connected with the inlet section of the venturi tube; the throat pipe section of the Venturi pipe is connected with an air pump, and a one-way valve is arranged in the connecting channel; the electrode structure of the venturi tube is connected to a high voltage power supply 400; the atomization device 500 is provided with an activated water parameter sensing module.

A first electromagnetic valve 81 is arranged in a conduit for connecting the water pump and the water tank, and the first electromagnetic valve 81 is also connected with the diffusion section of the Venturi tube; a second solenoid valve 82 is arranged in the connecting channel of the water pump and the inlet section of the venturi tube, and the second solenoid valve 82 is also connected with the atomizing device.

Specifically, the control module is further connected with the atomizing device, the high-voltage power supply, the water pump, the air pump, the first electromagnetic valve and the second electromagnetic valve respectively, and corresponding control processing is carried out.

The differential pressure structure at two ends of the throat pipe section of the Venturi pipe leads the interaction between gas and liquid to be stronger, a large number of micro bubbles are mainly generated at the diffusion section of the Venturi pipe, and the discharge electrode structure is arranged at the throat pipe section and the diffusion section, so that a gas-liquid phase discharge passage of plasma can be generated by using liquid mixed with a large number of micro bubbles, the plasma is favorably generated, and meanwhile, the repeated contact between the liquid and the plasma is favorably realized, the liquid phase is activated, and the plasma activated water is generated. And spraying the prepared plasma activated water to the surface of the escherichia coli bacterial tablet through an atomization device to achieve sterilization.

As shown in fig. 8, fig. 9 and table 1, the plasma activated water prepared by the present invention is sprayed on the surface of the escherichia coli bacterial sheet for sterilization, and the more the cycle number is, the higher the sterilization rate is, and the sterilization rate can reach more than 99%.

TABLE 1 cycle number and kill rate

Number of cycles	Rate of killing
		1	44.5％
2	59.5％
		5	87.25％
10	99.1％

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "disposed," "connected," "fixed," "rotated," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate medium, and may be used for communicating the inside of two elements or for interacting with each other, unless otherwise specifically defined, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to the specific circumstances.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (8)

1. A venturi for plasma activated water generation comprising an electrode structure and a venturi body, the venturi body comprising an inlet section, a throat section and a diffuser section; the throat pipe section is provided with an air inlet, two ends of the throat pipe section are respectively connected with the inlet section and the diffusion section to form a pressure difference structure, and the pressure difference structure is used for generating bubbles and generating cavitation effect on liquid operation; the electrode structure is used for ionizing gas introduced into the bubble or the gas inlet to generate plasma, and the energy generated by the cavitation effect is utilized to activate the liquid.

2. The venturi tube for plasma activated water generation according to claim 1, wherein the inlet section and the diffuser section are both two-stage structures formed by connecting a cylindrical circular port with a conical large circular port, both ends of the throat section are respectively connected with a conical small circular port, and a cylindrical air inlet is provided outside the throat section.

3. A venturi tube for plasma activated water generation according to claim 1, wherein the electrode structure comprises a first needle electrode and a second needle electrode, the first needle electrode being disposed inside the inlet section and the second needle electrode being disposed inside the diffuser section.

4. A venturi for plasma activated water generation according to claim 1, wherein said electrode structure comprises a plate electrode and an array needle electrode; the plate electrode is arranged inside the left half parts of the inlet section and the throat section, and the array needle electrode is arranged inside the diffusion section.

5. A venturi for plasma activated water generation according to claim 1, wherein said electrode structure comprises a metal sleeve electrode and a metal cone; the metal sleeve electrode is arranged on the periphery of the Venturi tube, and a layer of insulating sleeve is covered on the periphery of the metal sleeve electrode; the metal cone is arranged inside the diffusion section, and an insulating fixing buckle is arranged at the right end opening of the diffusion section.

6. An apparatus for plasma activated water generation, comprising an atomizing device, a high voltage power supply, an air pump, a water pump, a venturi tube and a water tank, wherein the venturi tube is the venturi tube for plasma activated water generation according to any one of claims 1 to 5; a liquid level meter is arranged inside the water tank, the liquid level meter is connected with a control module, and the water tank is connected with a water pump through a guide pipe; the water pump is connected with the inlet section of the Venturi tube; the throat pipe section of the Venturi pipe is connected with an air pump, and a one-way valve is arranged in the connecting channel; the electrode structure of the Venturi tube is connected with a high-voltage power supply; the atomization device is provided with an activated water parameter sensing module.

7. An apparatus for plasma activated water generation according to claim 6, where the atomization means is connected to the diffuser section of the venturi tube.

8. An apparatus for plasma activated water generation as defined in claim 6, wherein a first solenoid valve is provided in a conduit connecting the water pump with the water tank, and the first solenoid valve is further connected to a diffuser section of the venturi tube; and a second electromagnetic valve is arranged in a connecting channel between the water pump and the inlet section of the Venturi tube, and the second electromagnetic valve is also connected with the atomizing device.

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