Low-temperature plasma activated water preparation device and method

Abstract

The invention discloses a low-temperature plasma activated water preparation device and method, and relates to the technical field of plasma activated water preparation, and the low-temperature plasma activated water preparation device comprises a transparent liquid storage tank which is provided with a first liquid inlet, a first liquid outlet and a gas outlet; the preparation unit comprises a combination sheet, a second electrode sheet and a rectangular cylindrical insulating transparent enclosure wall, the combination sheet sequentially comprises a first dielectric sheet, a first electrode sheet and a second dielectric sheet from top to bottom, and a first cavity is formed among the first dielectric sheet, the first electrode sheet and the second dielectric sheet and is communicated through a connecting pipe and the like. And a cooling unit including a radiator, a water pump, a heat absorption water tank and the like can be arranged. According to the method, liquid is injected into the liquid storage tank, after the gas injection unit injects gas into the first cavity, the alternating current power supply is turned on, plasma is formed by ionizing air, and direct and indirect activation of the liquid is achieved. The device and the method can improve the activation efficiency and increase the concentration of active substances, and the cooling unit can stabilize the ionization work and reduce the loss of active components, and have significant advantages.

Description

Technical Field

[0001] The present invention relates to the technical field of plasma-activated water preparation, and particularly to a device and method for preparing low-temperature plasma-activated water. Background Art

[0002] As a solution rich in complex active substances, low-temperature plasma-activated water contains ozone, hydroxyl radicals, hydrogen peroxide, etc., and exhibits broad-spectrum bactericidal ability against bacteria and microorganisms. This technology has high bactericidal efficiency, little impact on food quality, and is green and residue-free, with significant advantages. In the food field, spraying or soaking and cleaning food with plasma-activated water can effectively reduce the colony numbers of pathogenic microorganisms such as Escherichia coli and Salmonella, thereby extending the shelf life of food and having broad application prospects.

[0003] However, there are many deficiencies in the existing technology for preparing plasma-activated water. In the technologies for directly treating water bodies, such as water jet, dielectric barrier discharge treatment, etc., there are problems such as small activation area, lack of fluidity of the activated water body, and small amount of activated water. For the indirect treatment technology, although it has the characteristic of a large amount of activated water, like the discharge technology in a single-medium quartz tube underwater, since the plasma cannot directly contact the water body, a large amount of active components are lost and the activation efficiency is low. And the traditional underwater plasma discharge technology relies too much on the plasma excitation effect in a local area when treating water bodies, making it difficult for other parts of the water body to be fully treated. Especially when facing the demand for large-scale water body treatment, uniform and efficient water body treatment cannot be achieved, seriously restricting the large-scale application and popularization of the low-temperature plasma-activated water technology. Summary of the Invention

[0004] The purpose of the present invention is to provide a device and method for preparing low-temperature plasma-activated water to solve the problems existing in the above-mentioned prior art and improve the preparation efficiency of low-temperature plasma-activated water.

[0005] To achieve the above purpose, the present invention provides the following solutions:

[0006] The present invention provides a device for preparing low-temperature plasma-activated water, including:

[0007] A liquid storage tank, the liquid storage tank is transparent, and a first liquid inlet, a first liquid outlet and a gas outlet are arranged on the liquid storage tank;

[0008] Preparation unit, the preparation unit includes a combined sheet, a second electrode sheet and a surrounding wall. The combined sheet includes a first dielectric sheet, a first electrode sheet and a second dielectric sheet that are sequentially attached from top to bottom. The edges of the first dielectric sheet and the second dielectric sheet are both outside the edge of the first electrode sheet, and the combined sheet further includes an insulating sealing ring for wrapping and sealing the edge of the first electrode sheet; the surrounding wall is insulating and transparent, the top end of the surrounding wall is hermetically connected to the bottom surface of the second dielectric sheet, and the bottom end is hermetically connected to the top surface of the second electrode sheet. A first chamber is formed between the second dielectric sheet, the surrounding wall and the second electrode sheet; a plurality of through holes communicating with the first chamber are provided on the second electrode sheet, a first ventilation hole is provided on the surrounding wall, and a second ventilation hole communicated with the first ventilation hole through a first connecting pipe is provided on the side wall of the liquid storage tank; the second electrode sheet and the surrounding wall are both arranged in the liquid storage tank; there is a gap between at least one side of the second electrode sheet and the combined sheet and the inner wall of the liquid storage tank, and there is a gap between the bottom surface of the second electrode sheet and the bottom surface of the liquid storage tank; the first electrode sheet is electrically connected to the live wire of the AC power supply, and the second electrode sheet is electrically connected to the neutral wire of the AC power supply;

[0009] Gas injection unit, the gas injection unit uses an air pump, and the air outlet of the air pump is communicated with the second ventilation hole through a second connecting pipe.

[0010] Preferably, it further includes a cooling unit. The cooling unit includes a radiator arranged outside the liquid storage tank, a water pump arranged outside the liquid storage tank and a hot water suction tank arranged inside the liquid storage tank. The hot water suction tank is airtight and the first dielectric sheet serves as the bottom plate of the hot water suction tank;

[0011] A second liquid inlet and a second liquid outlet are provided on the liquid storage tank, a third liquid inlet and a third liquid outlet are provided on the hot water suction tank, the liquid outlet of the water pump, the second liquid inlet and the third liquid inlet are sequentially communicated, the third liquid outlet, the second liquid outlet and the liquid inlet of the radiator are sequentially communicated, and the liquid outlet of the radiator is communicated with the liquid inlet of the water pump.

[0012] Preferably, both ends of the first dielectric sheet and the second dielectric sheet respectively extend out of the liquid storage tank, and the first dielectric sheet and the second dielectric sheet are respectively hermetically connected to the liquid storage tank.

[0013] Preferably, the radiator is a finned radiator.

[0014] Preferably, the first dielectric sheet, the first electrode sheet and the second dielectric sheet are sequentially bonded, and the first dielectric sheet and the second dielectric sheet are respectively hermetically connected to the insulating sealing ring.

[0015] Preferably, the surrounding wall is in the shape of a rectangular cylinder.

[0016] Preferably, the first dielectric sheet, the first electrode sheet, the second dielectric sheet and the second electrode sheet are parallel to each other.

[0017] Preferably, the first air vent is higher than the second electrode sheet.

[0018] Preferably, the materials of the first dielectric sheet and the second dielectric sheet are quartz or glass; the materials of the first electrode sheet and the second electrode sheet are aluminum, copper or stainless steel; the materials of the liquid storage tank, the surrounding wall and the water absorption water tank except for the part of the first dielectric sheet are all acrylic.

[0019] The present invention also provides a method for preparing low-temperature plasma-activated water. Based on the above-mentioned low-temperature plasma-activated water preparation device, a liquid to be activated is injected into the liquid storage tank through the first liquid inlet, and then the air pump is turned on to inject air into the first chamber to drain all the liquid in the first chamber and maintain it in a dynamic gas-liquid fluctuation state. The dynamic gas-liquid fluctuation state means that the gas in the first chamber can enter the liquid located in the liquid storage tank and outside the first chamber in the form of bubbles through the through holes on the second electrode sheet, so that the liquid located in the liquid storage tank and outside the first chamber is continuously oscillated, and part of the liquid can enter the first chamber through the through holes on the second electrode sheet during the oscillation process; then the AC power supply is turned on, and the air in the first chamber is ionized to form plasma, and the second electrode sheet directly activates the liquid entering the first chamber. After the plasma-rich gas in the first chamber diffuses into the liquid storage tank, it indirectly activates the liquid in the liquid storage tank until high-activation-degree plasma-activated water is prepared.

[0020] The present invention has achieved the following technical effects compared with the prior art:

[0021] The low-temperature plasma-activated water preparation device and method of the present invention can reduce the loss of activated substances and improve the activation efficiency by directly activating the water body in the first chamber, increasing the species composition and concentration in the plasma-activated water. During the ionization process, since the gas in the first chamber continuously enters the liquid in the form of bubbles through the through holes on the second electrode sheet, a dynamic gas-liquid fluctuation interface is formed near the second electrode sheet. The existence of the dynamic gas-liquid fluctuation interface will cause the water entering the first chamber through the through holes on the second electrode sheet to be updated due to the oscillation of the water body, thereby improving the activation efficiency of all the water in the liquid storage tank; and the plasma-rich gas diffusing into the water body in the form of bubbles can indirectly activate the water body located in the liquid storage tank but outside the first chamber. The amount of indirectly activated water is large, which can increase the gas-liquid mixing efficiency and further improve the activation efficiency of all the water in the liquid storage tank.

[0022] Furthermore, in the present invention, the areas of the first electrode sheet and the second electrode sheet can be set relatively large, providing a large-area plasma generation region, thereby improving the preparation efficiency.

[0023] Furthermore, in the present invention, the cooling unit removes the heat generated by the combined sheet, preventing the first dielectric sheet and the second dielectric sheet from overheating, improving the stability of the plasma ionization operation, reducing the temperature of the gas-liquid mixing region, reducing the loss of active components in the plasma-activated water, helping to lower the temperature of the plasma-activated water, and increasing the solubility of the active substances. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0025] Figure 1 is a schematic structural diagram of the device for preparing plasma-activated water at low temperature according to the present invention;

[0026] Figure 2 is a partial schematic structural diagram of the device for preparing plasma-activated water at low temperature according to the present invention;

[0027] Figure 3 is a partial schematic structural diagram of the device for preparing plasma-activated water at low temperature according to the present invention;

[0028] Figure 4 is a partial schematic structural diagram of the device for preparing plasma-activated water at low temperature according to the present invention;

[0029] In the figure: 1, liquid storage tank; 2, first liquid inlet; 3, first liquid outlet; 4, gas outlet; 5, second liquid inlet; 6, second liquid outlet; 7, wire passing port; 8, hot water suction tank; 9, third liquid inlet; 10, third liquid outlet; 11, first dielectric sheet; 12, second dielectric sheet; 13, second electrode sheet; 14, second ventilation hole; 15, through hole; 16, first electrode sheet; 17, first ventilation hole; 18, surrounding wall. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, rather than all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0031] The object of the present invention is to provide a device and method for preparing low-temperature plasma-activated water, so as to solve the problems existing in the above-mentioned prior art and improve the preparation efficiency of low-temperature plasma-activated water.

[0032] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Embodiment 1

[0034] As Figures 1 to 4 shown, this embodiment provides a device for preparing low-temperature plasma-activated water, including:

[0035] A liquid storage tank 1, the liquid storage tank 1 is transparent, and a first liquid inlet 2, a first liquid outlet 3 and an air outlet 4 are provided on the liquid storage tank 1;

[0036] A preparation unit, the preparation unit includes a combined sheet, a second electrode sheet 13 and a surrounding wall 18. The combined sheet includes a first dielectric sheet 11, a first electrode sheet 16 and a second dielectric sheet 12 that are sequentially laminated from top to bottom. The edges of the first dielectric sheet 11 and the second dielectric sheet 12 are both outside the edge of the first electrode sheet 16, and the combined sheet also includes an insulating sealing ring (not shown in the figure) for wrapping and sealing the edge of the first electrode sheet 16; the surrounding wall 18 is insulating and transparent, the top end of the surrounding wall 18 is hermetically connected to the bottom surface of the second dielectric sheet 12, and the bottom end is hermetically connected to the top surface of the second electrode sheet 13. A first chamber is formed between the second dielectric sheet 12, the surrounding wall 18 and the second electrode sheet 13; a plurality of through holes 15 communicating with the first chamber are provided on the second electrode sheet 13, a first ventilation hole 17 is provided on the surrounding wall 18, and a second ventilation hole 14 communicating with the first ventilation hole 17 through a first connecting pipe is provided on the side wall of the liquid storage tank 1; the second electrode sheet 13 and the surrounding wall 18 are both arranged in the liquid storage tank 1; there is a gap between at least one side edge of the second electrode sheet 13 and the combined sheet and the inner wall of the liquid storage tank 1, and there is a gap between the bottom surface of the second electrode sheet 13 and the bottom surface of the liquid storage tank 1; the first electrode sheet 16 is electrically connected to the live wire of the AC power supply, the second electrode sheet 13 is electrically connected to the neutral wire of the AC power supply, and the connecting wire between the second electrode sheet 13 and the neutral wire passes through the wire passing port 7 on the liquid storage tank 1. It should be noted that the connecting wire between the second electrode sheet 13 and the neutral wire needs to use a waterproof wire;

[0037] An air injection unit, the air injection unit uses an air pump, and the air outlet 4 of the air pump is connected to the second ventilation hole 14 through a second connecting pipe.

[0038] It should be noted that the reason for using an AC power supply instead of a DC power supply in this embodiment is that considering that using a DC power supply will result in a low efficiency of generating plasma by electric field breakdown of air between the first electrode plate 16 and the second electrode plate 13, while using an AC power supply can achieve a higher ionization efficiency, which is conducive to improving the preparation efficiency of low-temperature plasma-activated water.

[0039] The low-temperature plasma-activated water preparation device of this embodiment can reduce the loss of activated substances and improve the activation efficiency by directly activating the water body in the first chamber, increasing the species composition and concentration in the plasma-activated water. The dynamic gas-liquid fluctuation interface existing in the first chamber during the ionization process helps to update the directly activated water body. The gas discharged from the perforated electrode diffuses into the water body in the form of small bubbles to indirectly activate the water body, increasing the gas-liquid mixing efficiency and further improving the activation efficiency of the water body.

[0040] It should be noted that in this embodiment, there is a gap between the outer side wall of the enclosure 18 and the inner wall of the liquid storage tank 1 to facilitate the liquid in the liquid storage tank 1 to flow to the bottom of the liquid storage tank 1. Secondly, the areas of the first electrode plate 16 and the second electrode plate 13 can be set as large as possible to increase the ionization area and thus improve the preparation efficiency.

[0041] In an alternative embodiment of this embodiment, preferably, a cooling unit is further included. The cooling unit includes a radiator arranged outside the liquid storage tank 1, a water pump arranged outside the liquid storage tank 1, and a hot water suction tank 8 arranged inside the liquid storage tank 1. The hot water suction tank 8 is airtight and the first dielectric plate 11 serves as the bottom plate of the hot water suction tank 8; a second liquid inlet 5 and a second liquid outlet 6 are arranged on the liquid storage tank 1, a third liquid inlet 9 and a third liquid outlet 10 are arranged on the hot water suction tank 8, the liquid outlet of the water pump, the second liquid inlet 5 and the third liquid inlet are connected in sequence, the third liquid outlet 10, the second liquid outlet 6 and the liquid inlet of the radiator are connected in sequence, and the liquid outlet of the radiator is connected to the liquid inlet of the water pump; the heat generated by the combined plate is taken away by the cooling unit to prevent the first dielectric plate 11 and the second dielectric plate 12 from overheating, improve the stability of the plasma ionization operation, reduce the temperature of the gas-liquid mixing area, reduce the loss of active components in the plasma-activated water, help to reduce the temperature of the plasma-activated water, and improve the solubility of the active substances.

[0042] In this embodiment, the side wall of the hot water suction tank 8 is integrally formed with the enclosure 18. In addition, the first dielectric plate 11 serves as the bottom plate of the hot water suction tank 8, that is, the upper surface of the first dielectric plate 11 serves as the lower surface of the hot water suction tank 8. This method helps to reduce the heating temperature of the first dielectric plate 11 and even the combined plate, and improve the long-term discharge operation stability.

[0043] In an alternative embodiment of the present embodiment, preferably, both ends of the first dielectric sheet 11 and the second dielectric sheet 12 extend out of the liquid storage tank 1 respectively, and the first dielectric sheet 11 and the second dielectric sheet 12 are hermetically connected to the liquid storage tank 1 respectively; such a setting can make both the first dielectric sheet 11 and the second dielectric sheet 12 partially located in the liquid in the liquid storage tank 1, and divide both the first dielectric sheet 11 and the second dielectric sheet 12 into a cooling zone - ionization activation zone - cooling zone, which is beneficial to reducing the temperature of the first dielectric sheet 11 and the second dielectric sheet 12.

[0044] In an alternative embodiment of the present embodiment, preferably, the radiator is a fin - type radiator, which is a mature commercially available product and has a high heat dissipation efficiency.

[0045] In an alternative embodiment of the present embodiment, preferably, the first dielectric sheet 11, the first electrode sheet 16, and the second dielectric sheet 12 are adhesively bonded in sequence, and the first dielectric sheet 11 and the second dielectric sheet 12 are hermetically connected to the insulating sealing ring respectively; the setting of the insulating sealing ring can prevent the liquid in the liquid storage tank 1 from directly contacting the first electrode sheet 16 and causing a short - circuit phenomenon.

[0046] In an alternative embodiment of the present embodiment, preferably, the enclosure wall 18 is in the shape of a rectangular cylinder; in actual applications, the enclosure wall 18 can also be set to a cylindrical shape or other shapes according to actual needs.

[0047] In an alternative embodiment of the present embodiment, preferably, the first dielectric sheet 11, the first electrode sheet 16, the second dielectric sheet 12, and the second electrode sheet 13 are parallel to each other.

[0048] In an alternative embodiment of the present embodiment, preferably, the first air vent is higher than the second electrode sheet 13, and there is no other gas flow channel in the first chamber, preventing the liquid in the first chamber from directly contacting the second dielectric sheet 12, improving the safety during high - voltage discharge, and effectively avoiding the discharge sparking phenomenon caused by the connection between water and the electrode during the preparation of activated water by underwater discharge.

[0049] In an alternative embodiment of the present embodiment, preferably, the materials of the first dielectric sheet 11 and the second dielectric sheet 12 are quartz or glass; the materials of the first electrode sheet 16 and the second electrode sheet 13 are aluminum, copper, or stainless steel; the materials of the liquid storage tank 1, the enclosure wall 18, and the parts of the hot - water absorption tank 8 except the first dielectric sheet 11 are all acrylic.

[0050] A plurality of through - holes 15 penetrate through the surface of the second electrode sheet 13 in an array and are in direct contact with the liquid in the liquid storage tank 1. The pores are dynamically filled with water bodies and are in direct contact with the plasma. At the same time, the tiny through - holes 15 can serve as the air outlet 4 to quickly blow the plasma activation gas into the gas - liquid mixing area, forming dense and uniform bubbles to improve the gas - liquid mixing efficiency.

[0051] Embodiment Two

[0052] This embodiment provides a method for preparing low-temperature plasma-activated water. Based on the low-temperature plasma-activated water preparation device of Embodiment 1, specifically:

[0053] Inject the liquid to be activated into the liquid storage tank 1 through the first liquid inlet 2, and then turn on the air pump to inject air into the first chamber to drain all the liquid in the first chamber and maintain it in a dynamic gas-liquid fluctuation state. The dynamic gas-liquid fluctuation state means that the gas in the first chamber can enter the liquid located in the liquid storage tank 1 and outside the first chamber in the form of bubbles through the through holes 15 on the second electrode plate 13, causing the liquid located in the liquid storage tank 1 and outside the first chamber to oscillate continuously, and part of the liquid can enter the first chamber through the through holes 15 on the second electrode plate 13 during the oscillation process; then turn on the AC power supply, form plasma by ionizing the air in the first chamber, the second electrode plate 13 directly activates the liquid entering the first chamber, and after the plasma-rich gas in the first chamber diffuses into the liquid storage tank 1, it indirectly activates the liquid in the liquid storage tank 1 until high-activation-degree plasma-activated water is prepared.

[0054] During the preparation process of the low-temperature plasma-activated water preparation method of this embodiment, directly activating the water body in the first chamber can reduce the loss of activated substances and improve the activation efficiency, increasing the species composition and concentration in the plasma-activated water. During the ionization process, since the gas in the first chamber continuously enters the liquid in the form of bubbles through the through holes 15 on the second electrode plate 13, a dynamic gas-liquid fluctuation interface is formed near the second electrode plate 13 (i.e., the interface where water can enter the first chamber through the through holes 15 in the dynamic gas-liquid fluctuation state). The existence of the dynamic gas-liquid fluctuation interface will cause the water entering the first chamber through the through holes 15 on the second electrode plate 13 due to the oscillation of the water body to be updated, thereby improving the activation efficiency of all the water in the liquid storage tank 1; and the plasma-rich gas diffusing into the water body in the form of bubbles can indirectly activate the water body located in the liquid storage tank 1 but outside the first chamber. The amount of indirectly activated water is relatively large, which can increase the gas-liquid mixing efficiency and further improve the activation efficiency of all the water in the liquid storage tank 1.

[0055] The liquid storage tank 1, the surrounding wall 18, and the heat-absorbing water tank 8 are transparent, which can facilitate observing the plasma generated in the first chamber, the mixing state when the plasma gas is blown into the water body through the through holes 15 on the second electrode plate 13, and judging whether it is in the dynamic gas-liquid fluctuation state by observing whether the dynamic gas-liquid interface is formed.

[0056] In the present invention, specific examples are used to illustrate the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation on the present invention.

Claims

1. A low-temperature plasma activated water preparation device, characterized in that: include: A liquid storage box, the liquid storage box is transparent and is provided with a first liquid inlet, a first liquid outlet and an air outlet; A preparation unit, the preparation unit includes a combination sheet, a second electrode sheet and a surrounding wall, the combination sheet includes a first dielectric sheet, a first electrode sheet and a second dielectric sheet which are sequentially attached from top to bottom, the edges of the first dielectric sheet and the second dielectric sheet are both outside the edge of the first electrode sheet, and the combination sheet also includes an insulating sealing ring for wrapping and sealing the edge of the first electrode sheet; the surrounding wall is insulating and transparent, the top of the surrounding wall is sealed to the bottom surface of the second dielectric sheet, the bottom end is sealed to the top surface of the second electrode sheet, and a first dielectric sheet is formed between the second dielectric sheet, the surrounding wall and the second electrode sheet chamber; the second electrode sheet is provided with a plurality of through holes communicating with the first chamber, the surrounding wall is provided with a first vent hole, and the side wall of the liquid storage tank is provided with a second vent hole communicating with the first vent hole through a first connecting pipe; the second electrode sheet and the surrounding wall are both arranged in the liquid storage tank; at least one side edge of the second electrode sheet and the combination sheet is spaced from the inner wall of the liquid storage tank, and the bottom surface of the second electrode sheet is spaced from the bottom surface of the liquid storage tank; the first electrode sheet is electrically connected to the live wire of the AC power supply, and the second electrode sheet is electrically connected to the neutral wire of the AC power supply; The gas injection unit adopts an air pump, and the gas outlet of the air pump is connected with the second vent hole through a second connecting pipe.

2. The low-temperature plasma activated water preparation device according to claim 1, characterized in that: It also includes a cooling unit, which includes a radiator arranged outside the liquid storage tank, a water pump arranged outside the liquid storage tank, and a hot water absorption tank arranged inside the liquid storage tank, the hot water absorption tank is sealed and the first dielectric sheet serves as a bottom plate of the hot water absorption tank; The liquid storage tank is provided with a second liquid inlet and a second liquid outlet, the heat absorption tank is provided with a third liquid inlet and a third liquid outlet, the liquid outlet of the water pump, the second liquid inlet and the third liquid inlet are connected in sequence, the third liquid outlet, the second liquid outlet and the liquid inlet of the radiator are connected in sequence, and the liquid outlet of the radiator is connected to the liquid inlet of the water pump.

3. The low-temperature plasma activated water preparation device according to claim 1, characterized in that: Both ends of the first dielectric sheet and the second dielectric sheet extend out of the liquid storage tank, and the first dielectric sheet and the second dielectric sheet are respectively sealed and connected to the liquid storage tank.

4. The low-temperature plasma activated water preparation device according to claim 2, characterized in that: The radiator is a fin type radiator.

5. The low-temperature plasma activated water preparation device according to claim 1, characterized in that: The first dielectric sheet, the first electrode sheet and the second dielectric sheet are bonded in sequence, and the first dielectric sheet and the second dielectric sheet are respectively sealed and connected to the insulating sealing ring.

6. The low-temperature plasma activated water preparation device according to claim 1, characterized in that: The surrounding wall is in a rectangular tube shape.

7. The low-temperature plasma activated water preparation device according to claim 1, characterized in that: The first dielectric sheet, the first electrode sheet, the second dielectric sheet and the second electrode sheet are parallel to each other.

8. The low-temperature plasma activated water preparation device according to claim 1, characterized in that: The first vent is higher than the second electrode sheet.

9. The low-temperature plasma activated water preparation device according to claim 2, characterized in that: The first dielectric sheet and the second dielectric sheet are made of quartz or glass; the first electrode sheet and the second electrode sheet are made of aluminum, copper or stainless steel; the liquid storage tank, the surrounding wall and the heat absorption water tank except the first dielectric sheet are all made of acrylic.

10. A method for preparing low-temperature plasma activated water, based on the low-temperature plasma activated water preparation device according to any one of claims 1 to 9, characterized in that: The liquid to be activated is injected into the liquid storage tank through the first liquid inlet, and then the air pump is turned on to inject air into the first chamber to discharge all the liquid in the first chamber and maintain it in a dynamic gas-liquid fluctuation state, wherein the dynamic gas-liquid fluctuation state means that the gas in the first chamber can enter the liquid located in the liquid storage tank and outside the first chamber in the form of bubbles through the through holes on the second electrode sheet, so that the liquid located in the liquid storage tank and outside the first chamber is constantly oscillating, and part of the liquid can enter the first chamber through the through holes on the second electrode sheet during the oscillation process; then the AC power supply is turned on to form plasma by ionizing the air in the first chamber, and the second electrode sheet directly activates the liquid entering the first chamber, and after the plasma-rich gas in the first chamber diffuses into the liquid storage tank, the liquid in the liquid storage tank is indirectly activated until plasma-activated water with a high degree of activation is prepared.

Images