A preparation system and preparation process of nano-scale oxygen bubbles

Abstract

The invention relates to a preparation system and preparation process of nano-scale oxygen bubbles. The preparation system of the nano-scale oxygen bubbles comprises a gas-liquid mixing device, a gas-liquid mixing device, a primary and a secondary refinement device; the gas-liquid mixing device comprises an oxygen supply device, a water purification tank, an aeration cyclone and a cyclone aeration tank; the water purification tank is connected to the cyclone aeration tank via the aeration cyclone, and the oxygen supply device is connected to the cyclone aeration tank; the primary refinement device comprises a cyclone decompression expansion refinement device, and the cyclone decompression expansion refinement device is connected to the liquid outlet at the bottom of the cyclone aeration tank via a pipeline; the secondary refinement device comprises a nano-bubble water tank and a narrow slit cutter, and the narrow slit cutter is connected to the cyclone decompression expansion refinement device via a pipeline. The preparation system of the nano-scale oxygen bubbles has a simple structure, low cost, high stability and high productivity, and can be used for large-scale industrial production of nano-bubble water with a dissolved oxygen concentration greater than 100 mg / L, and the nano-bubble particle size is smaller, which can meet the development of medicine, medical treatment, food and environmental protection technology.

Description

Technical Field

[0001] The invention relates to the technical field of nano bubble preparation, and in particular to a system and process for preparing nano-scale oxygen bubbles. Background Art

[0002] Nanobubbles are bubbles with a diameter less than 1μm (1000nm). Nanobubbles have physical and chemical properties that conventional sized bubbles do not have, such as high internal pressure, high surface energy, high interfacial activity, etc. Bubble nanocrystalization is a key technology in the chemical, food and environmental protection industries to promote material transfer, energy transfer, heat transfer and increase the speed of chemical reactions.

[0003] According to the Young-Laplace law, the surface tension of nano-bubbles is inversely proportional to the diameter of the bubble and directly proportional to the internal pressure of the bubble. As the surface tension increases, the bubble shrinks continuously, and the internal pressure also increases, which is the so-called self-pressurization phenomenon. Once the internal pressure of the shrinking bubble loses balance with the surface tension, the nano-bubble finally bursts at a pressure of about 4000 atmospheres. After the bubble bursts, it becomes active gas molecules (free oxygen), and its free thermal motion is enhanced, which can react with the H of water molecules at any time. + OH - Stable covalent bonds are formed, thus forming a stable super-saturated nanobubble water system (H2O.(O2)9).

[0004] As a method of generating nanobubbles in a liquid phase, researchers have proposed various techniques:

[0005] Chinese utility model patent CN206328202U discloses a method for preparing high-oxygen water: using the negative pressure of a gas-liquid mixing pump to inhale gas, the high-speed rotating pump impeller mixes the liquid and gas and breaks the bubbles to produce a high-concentration liquid with micro-nano bubbles. This technology can be used for large-scale industrial production, but the gas-liquid ratio is about 1:9 (the air intake is 8-10%), and the diameter of the micro-nano bubbles is large, uneven, and unstable.

[0006] Chinese invention patent CN 102173498B discloses a production method and device for preparing high-oxygen water by gyratory cutting: a ring-shaped filler is used to rotate at high speed on the axis to perform gas cutting, oxygen meets water thrown out from the small holes of the filler, and the water flow and oxygen flow are forced to collide and exchange mass transfer to achieve micro-nano bubbles. The oxygen flow rate of this technology is 200-400L / h, the water flow rate is 25-35L / h, and the dissolved oxygen rate can reach 20-50mg / L. However, this device requires a large oxygen supply, high cost, low production capacity, and is not suitable for large-scale industrial production.

[0007] Chinese patents CN201510424048X and ZL2018204389012 disclose a high oxygen water preparation system based on gas-liquid micro-nano cutting and thinning, which uses a static variable pitch spiral cutter to achieve micro-nano-level cutting and thinning of gas at almost normal temperature and pressure, consumes less energy, and can be industrialized on a large scale. However, the static variable pitch spiral cutter can only achieve dissolved oxygen ≤ 60 mg / L, and the equipment manufacturing cost is high and the dissolved oxygen capacity is limited.

[0008] Japanese Patent Publication No. 2006-289183 discloses applying ultrasonic vibration to a liquid phase containing microbubbles such as microbubbles, thereby utilizing the vibration to collapse the microbubbles and generate nanobubbles. This invention generates nanobubbles based on gas dissolved in a liquid phase, but has the problem of difficulty in stabilizing the supersaturation in the liquid phase after the generation of nanobubbles.

[0009] It can be seen that there is currently no mature technology and production process for large-scale industrial production of nano bubble water (dissolved oxygen concentration greater than 100 mg / L) with low cost, high stability, and high production capacity that can meet the requirements of high supersaturated gas dissolved concentration in medicine, medical treatment, food, environmental protection, etc. Therefore, it is of great significance to develop a nano bubble water technology and production process with high supersaturated oxygen dissolved concentration, smaller nano bubble particle size, higher stability, low cost, easy maintenance, low energy consumption, and large-scale industrialization for the development of medicine, medical treatment, food, and environmental protection technology. Summary of the invention

[0010] The present invention provides a system and a process for preparing nano-scale oxygen bubbles, which have simple structure, low cost, high stability and high production capacity, and can be used for large-scale industrial production of nano-bubble water with a dissolved oxygen concentration greater than 100 mg / L. The nano-bubble particle size is smaller, which can meet the development of medicine, medical treatment, food and environmental protection technology, and solve the problems existing in the prior art.

[0011] One of the technical solutions adopted by the present invention to solve the above technical problems is:

[0012] A system for preparing nano-scale oxygen bubbles, comprising:

[0013] A gas-liquid mixing device, the gas-liquid mixing device comprising an oxygen supply device, a water purification tank, an aeration cyclone and a cyclone aeration tank; the water purification tank is connected to the cyclone aeration tank via the aeration cyclone, and the oxygen supply device is connected to the cyclone aeration tank;

[0014] A first-level refinement device, the first-level refinement device includes a cyclone decompression expansion refinement device, and the cyclone decompression expansion refinement device is connected to the liquid outlet at the bottom end of the cyclone gasification tank through a pipeline;

[0015] The secondary refinement device comprises a nano bubble water tank and a narrow slit cutter arranged therein, and the narrow slit cutter is connected to the swirl decompression expansion refinement device through a pipeline.

[0016] Furthermore, the cyclone gasification tank comprises a main tank and a sub-tank which are connected to each other; the gasification cyclone is arranged in the main tank, the water purification tank is connected to the gasification cyclone via a water pipeline, and the oxygen supply device is connected to the sub-tank via a gas pipeline; the cyclone decompression expansion refinement device is connected to the liquid outlet at the bottom of the main tank via a pipeline;

[0017] The bottom outlet of the aerating cyclone extends into the liquid level below the main tank, and the outlet of the gas pipeline connected to the oxygen supply device extends into the liquid level below the auxiliary tank; a cyclone aerating pipe is arranged between the top of the cyclone aerating tank and the aerating cyclone.

[0018] Furthermore, the oxygen supply device includes an oxygen source and an oxygen tank. After the oxygen source enters the oxygen tank, it is decompressed and transported to below the liquid level of the auxiliary tank of the swirl gas tank through a gas pipeline connected to the oxygen tank.

[0019] Furthermore, the oxygen source is a medical grade oxygen source or a medical oxygen generator and an oxygen tank.

[0020] Furthermore, a clean water pump and a clean water pump pressure gauge are provided on the water delivery pipeline connecting the clean water tank and the aerated cyclone.

[0021] Furthermore, the cyclone gasification pipe is used to transport the oxygen above the liquid level in the cyclone gasification tank into the gasification cyclone, so that the oxygen is mixed in the clean water entering the gasification cyclone and enters the cyclone gasification tank below the liquid level.

[0022] Furthermore, an air-water pump is arranged on the pipeline connecting the cyclone decompression expansion refinement device and the liquid outlet at the bottom end of the main tank.

[0023] Furthermore, the aerated cyclone is a pipe with a funnel-shaped internal cavity; an upper connecting air pipe and a lower connecting water pipe are arranged between the main tank and the auxiliary tank, the upper connecting air pipe is used to connect the upper gas space of the main tank and the auxiliary tank, and the lower connecting water pipe is used to connect the liquid space in the main tank and the auxiliary tank.

[0024] Furthermore, a control valve is arranged on the gas transmission pipeline, and a swirl gas tank pressure gauge, an upper liquid level sensor and a lower liquid level sensor are arranged on the swirl gas tank.

[0025] Furthermore, the control valve, the swirl gas tank pressure gauge, the upper liquid level sensor and the lower liquid level sensor are electrically connected to the controller respectively.

[0026] Furthermore, the swirl gas tank pressure gauge is arranged on the main tank, and the upper liquid level sensor and the lower liquid level sensor are arranged in the auxiliary tank.

[0027] Furthermore, the control valve includes a gas pressure reducing valve, an oxygen pressure gauge, a gas flow regulating valve, a needle valve, an electromagnetic gas switch valve, and a one-way valve.

[0028] Furthermore, the controller receives signals from the upper and lower liquid level sensors and controls the electromagnetic gas switch valve to open and close to adjust the gas volume in the swirl gas tank.

[0029] The white gas-water mixture is discharged from the cyclone gasifier and then pressurized by the gas-water pump and enters the tangential liquid inlet on the side of the cyclone decompression expansion refiner.

[0030] Furthermore, a bottom flow port is arranged at the bottom end of the cyclone decompression expansion and refinement device, and the bottom flow port extends into the nano bubble water tank through a water guide pipe and is connected to the narrow slit cutter. A liquid inlet pipe is connected to the outside of the top of the cyclone decompression expansion and refinement device, and the liquid inlet pipe is connected to the liquid outlet of the cyclone gasification tank through an air-water pump.

[0031] Furthermore, a nano bubble water flow regulating valve and a nano bubble water pressure gauge are arranged on the liquid inlet pipe.

[0032] Furthermore, a safety valve is provided on the nano bubble water tank.

[0033] Furthermore, a first-level nano bubble water flow regulating valve is arranged on the water guide pipe.

[0034] Furthermore, the cyclone decompression expansion and refinement device is modified from a gas-liquid cyclone separator, and the overflow port of the gas-liquid cyclone separator is sealed by a cover. The diameter of the cylindrical section of the cyclone cavity in the cyclone decompression expansion and refinement device is 1-4 times larger than the diameter of the water pipe. With such a configuration, since the cross-sectional area of ​​the cylindrical section of the cyclone cavity of the cyclone decompression expansion and refinement device suddenly increases, the water flow velocity decreases, the static pressure increases, the bubbles are compressed, the internal pressure of the bubbles increases, some bubbles burst, and the gas dissolves in the water. As the cross-sectional area of ​​the conical section of the cyclone decompression expansion and refinement device gradually decreases along the water flow direction, the water flow velocity increases, the static pressure decreases, and the undissolved part of the oxygen in the water suddenly expands, breaks away from the constraints of the molecular bond energy of the water molecules, becomes free oxygen, and dissolves in the water, thus forming a first-level nano bubble high oxygen water, which is a first-level bubble refined dissolved oxygen. In addition, the cyclone decompression expansion and refinement device also plays a role in strengthening gas-liquid mixing.

[0035] Furthermore, the narrow slot cutter includes a flow cutoff plate, a narrow slot cutting plate assembly and a fixing sleeve for connecting and fixing the flow cutoff plate and the narrow slot cutting plate assembly; a flow cutoff channel is arranged in the flow cutoff plate, and the opening of the flow cutoff channel is arranged to be gradually reduced; a plurality of spacing cavities are arranged on the plate surface of the narrow slot cutting plate assembly at intervals along the water flow direction, and radial narrow slot groups are arranged on the narrow slot cutting plate assembly outside each spacing cavity, and the narrow slot groups are arranged to partially overlap along the water flow direction.

[0036] Furthermore, the narrow slit cutting plate assembly is composed of a plurality of narrow slit cutting single plates, the ends of adjacent narrow slit cutting single plates are sealed, the spacing cavity is arranged on one side of each narrow slit cutting single plate, and adjacent narrow slit cutting single plates are arranged at intervals via the spacing cavity; the narrow slit group is arranged on the narrow slit cutting single plates corresponding to each spacing cavity; and a positioning piece for fixedly connecting each narrow slit cutting single plate is arranged on the narrow slit cutting plate assembly.

[0037] Furthermore, the positioning member is a positioning pin. Each slit-cut single board is fixedly connected via at least two positioning pins.

[0038] Furthermore, the narrow slit group includes 4-10 narrow slits, and each narrow slit extends radially from the position where the central axis of the narrow slit cutting plate assembly is located as the starting point; the thickness of the narrow slit along the water flow direction is 2-5mm; the width of the narrow slit along the board surface direction of the narrow slit cutting plate assembly is 0.1-1mm; the thickness of the partition cavity along the water flow direction is 0.7mm; the number of narrow slit cutting single plates that make up the narrow slit cutting plate assembly is an odd number, and the narrow slit groups of the odd-numbered narrow slit cutting single plates have the same projection along the water flow direction, and the narrow slit groups of the even-numbered narrow slit cutting single plates have the same projection along the water flow direction; the projection of the narrow slit group of the odd-numbered narrow slit cutting single plates along the water flow direction is staggered by 1.5°-2.0° from the projection of the narrow slit group of the even-numbered narrow slit cutting single plates along the water flow direction.

[0039] Furthermore, the narrow slit group preferably includes 8 slits; the narrow slit thickness is preferably 3 mm; and the narrow slit width is preferably 0.5 mm.

[0040] Furthermore, the length of the narrow slit is calculated based on the amount of water to be treated, ensuring that the flow rate of water is 80-100 m / s when passing through the narrow slit.

[0041] Furthermore, the number of narrow slot cutting single plates constituting the narrow slot cutting plate assembly is preferably 5; the projection of the narrow slot group on the odd-numbered narrow slot cutting single plates along the water flow direction is staggered by 1.79° from the projection of the narrow slot group on the even-numbered narrow slot cutting single plates along the water flow direction.

[0042] Furthermore, the intercepting channel of the intercepting plate is a tapered hole intercepting channel; the intercepting plate is a circular intercepting plate, and the narrow slit cutting plate assembly is a circular narrow slit cutting plate assembly.

[0043] Furthermore, the radius of the channel opening on the side adjacent to the slit cutting plate assembly of the intercepting channel is set smaller than the length of the slit.

[0044] Furthermore, the spacing cavity is a circular concave groove; the diameter of the spacing cavity is 4-6 mm smaller than the outer diameter of the narrow slot cutting plate.

[0045] Furthermore, the fixing sleeve comprises a positioning sleeve, a locking sleeve and a positioning block. The positioning sleeve cooperates with the positioning block to position the intercepting plate. The locking sleeve is arranged on the outside of the intercepting plate and the narrow slot cutting plate assembly and is locked with the positioning sleeve.

[0046] Furthermore, a first gasket and a sealing ring are arranged between the positioning block and the positioning sleeve, and a second gasket is arranged between the intercepting plate and the narrow slot cutting plate assembly.

[0047] Furthermore, the first gasket is a polytetrafluoroethylene gasket.

[0048] Furthermore, the narrow slot groups and the spacing chambers are arranged in sequence along the water flow direction on the narrow slot cutting plate assembly.

[0049] The second technical solution adopted by the present invention to solve the above technical problems is:

[0050] A process for preparing nano-scale oxygen bubbles comprises the following steps:

[0051] (1) Gas-liquid mixing: using cyclone aeration to obtain a gas-water mixture;

[0052] (2) Primary refinement: The gas-water mixture is transported to a cyclone decompression expansion refinement device for treatment to obtain primary nanobubble water;

[0053] (3) Secondary refinement: The first-level nano bubble water is further cut by a narrow slit cutter to obtain nano-scale oxygen bubbles.

[0054] Furthermore, in step (1), the gas-liquid mixing is to input the clean water and oxygen into the cyclone gasification tank together by cyclone mixing, wherein the oxygen pressure at the outlet of the oxygen tank is 0.2-0.7MPa and the oxygen flow rate is 5-100l pm; in step (2), the gas-water mixed liquid is transported to the cyclone decompression expansion refinement device, and the water flow velocity, static pressure and bubble contraction and expansion changes are achieved through the cyclone cavity cylindrical section and the cyclone cavity conical section of the cyclone decompression expansion refinement device; in step (3), the first-level nano bubble water discharged from the water guide pipe is received, and a large amount of water flow velocity gradient and pressure gradient existing between the single plates are cut through the narrow slit of the narrow slit cutter, and the large bubbles are further sheared to form secondary nano-scale bubbles.

[0055] Furthermore, the purified water in step (1) is mineral water or pure water treated by reverse osmosis after coarse filtration, fine filtration, ion exchange resin treatment, ultrafiltration. Preferably, the purified water is degassed. The degassed purified water makes the oxygen content in the raw water less than 1 mg / L. Preferably, the degassing process adopts a hydrophobic hollow fiber membrane vacuum degassing process.

[0056] Furthermore, the diameter of the cylindrical section of the cyclone chamber in the cyclone decompression expansion and refinement device in step (2) is 3 times greater than the diameter of the water conduit.

[0057] Furthermore, in step (3), the liquid flow rate in the shear channel of the narrow slit group of the narrow slit cutter is 100 m / s.

[0058] The preparation system adopts a cyclonic negative pressure aeration method and a nano bubble high oxygen water preparation method with a two-stage composite refinement function.

[0059] The cyclone negative pressure aeration method is implemented using the aforementioned gas-liquid mixing device. The specific working principle is: the liquid component moves axially downward and radially outward at the same time under the action of the cyclone field of the aeration cyclone, and moves downward along the wall of the device when it reaches the cone section, and is discharged from the bottom flow port and enters the cyclone aeration tank, thus forming an outer vortex flow field. The center of the outer vortex flow field is not a vacuum environment with zero atmospheric pressure, but a funnel-shaped air duct, in which a negative air pressure is formed, which is much lower than the atmospheric pressure of the outside environment. In this way, a gas (oxygen source) with a certain pressure can be added to the inside of the aeration cyclone through the overflow port of the aeration cyclone, mixed with the clean water entering the aeration cyclone, and the aeration process is successfully completed. The energy loss of the cyclone aeration method is much smaller than that of the Venturi aeration method.

[0060] Furthermore, the purpose of the cyclone gasifier of the gas-liquid mixing device is to realize cyclone negative pressure gasification and preliminary gas-water mixing. The water inlet of the gasifier cyclone is connected to the water outlet of the clean water pump on the water supply pipeline through the water pressure gauge, flow meter and flow regulating valve of the gasifier cyclone inlet; the bottom of the cyclone gasifier is provided with a liquid outlet, which is connected to the nano bubble water tank through the switch valve, gas-water pump, flow regulating valve, pressure gauge, cyclone decompression expansion refinement device and narrow slit cutter. There is also an emptying port at the bottom of the cyclone gasifier. The auxiliary tank of the cyclone gasifier mainly realizes the gasification function, and a sensor and a gas supply pipeline are installed at the bottom. The one-way valve, electromagnetic gas switch valve, gas flow regulating valve, gas flow meter, oxygen pressure gauge on the gas supply pipeline are connected to the switch valve of the oxygen tank and the oxygen tank and the gas source. The upper part of the cyclone gasifier is pure oxygen, and the lower part is a gas-water mixing night. Oxygen is not added directly through the overflow port of the aerating cyclone, but is added at the bottom of the auxiliary tank and enters the upper space of the cyclone aerating tank in the form of large bubbles. The gas-water mixture is initially mixed in the cyclone chamber of the aerating cyclone, and then enters the lower space of the cyclone aerating tank from the bottom flow port of the aerating cyclone. Part of the oxygen in the lower space of the cyclone aerating tank dissolves into the water, and the undissolved oxygen enters the upper space of the cyclone aerating tank. As the oxygen in the upper space of the swirl gas tank is partly dissolved in the water and continuously consumed, the water level in the swirl gas tank is constantly rising. In order to maintain the basic balance of the liquid level in the swirl gas tank or to maintain the pressure in the swirl gas tank basically unchanged, as the oxygen is consumed, the water level in the swirl gas tank rises. When it rises to the upper liquid level sensor in the auxiliary tank, the sensor sends a signal to open the electromagnetic gas switch valve on the gas pipeline, oxygen enters the swirl gas tank, the air pressure in the upper space of the swirl gas tank increases, and the liquid level in the swirl gas tank drops; when it drops to the lower liquid level sensor, the sensor sends a signal to close the electromagnetic gas switch valve, oxygen cannot enter the swirl gas tank, and the air pressure in the upper space of the swirl gas tank decreases. This reciprocating cycle achieves the basic balance of the liquid level in the swirl gas tank, maintains the pressure in the swirl gas tank basically unchanged, and maximizes the utilization rate of oxygen.

[0061] The gas-water mixture mixed by the gas-liquid mixing device enters the aforementioned cyclone decompression expansion refinement device. Through the structural setting of the aforementioned cyclone decompression expansion refinement device, the first-level nano bubble high oxygen water is obtained, and then enters the narrow slit cutter. As the conical hole cross-sectional area of ​​the conical hole intercepting plate gradually decreases, the static pressure of the water flow continues to decrease, and the undissolved part of the oxygen in the water gradually expands, breaking away from the constraints of the molecular bond energy of the water molecules, becoming free oxygen and dissolving into the water. Then the water carries the bubbles into the cutting area of ​​the narrow slit cutting plate. As the water flow area decreases, the water flow velocity increases and the cutting force is strengthened. At the same time, there are a large number of water flow velocity gradients and pressure gradients between the narrow slit cutting plates, and the large bubbles are further sheared to form a large number of secondary nano-scale bubbles. This is the secondary bubble refinement of dissolved oxygen. The diameter of the nano bubble is about 500nm, and the dissolved oxygen concentration reaches 80-120mg / L.

[0062] The purpose of setting up the nano bubble water tank is to play a buffering role. A gas pressure gauge is installed on the top of the nano bubble water tank to observe the pressure changes in the tank. A fully open and closed safety valve is installed on the top of the tank to prevent the pressure in the tank from overloading. An online dissolved oxygen concentration detector is installed in the middle of the tank to monitor the dissolved oxygen concentration in the tank at any time (not shown). After the primary gas-water mixture in the cyclone gasification tank is pressurized by the gas-water pump, it enters the cyclone decompression expansion refiner to refine the bubbles, forming a first-level nano bubble high oxygen water, and then enters the narrow slit cutter to be further cut and refined by bubbles to become a second-level nano bubble high oxygen water, and finally enters the nano bubble water tank. Finally, open the gate valve of the drainage waterway at the bottom of the nano bubble water tank, connect the nano bubble water tank with the water inlet pipe of the water terminal equipment, and the second-level nano bubble high oxygen water enters the water terminal equipment. In this way, the production of medical-grade nano bubble high oxygen water with a diameter of about 500nm and a dissolved oxygen concentration of 100-120mg / L is achieved.

[0063] Beneficial effects of the present invention:

[0064] 1. It adopts two-stage gas nano-composite refinement technology: decompression expansion refinement of swirl refinement mixer and narrow slit cutting refinement of narrow slit cutter. The dissolved oxygen concentration reaches 120ppm and the diameter of nanobubbles is about 500nm.

[0065] 2. During the operation of the system for preparing medical-grade nanobubble high-oxygen water of the present invention, oxygen is always in a closed space, with basically no additional loss, and the utilization rate of oxygen is higher than 98%.

[0066] 3. Due to the use of cyclone negative pressure aeration and two-stage nano bubble refinement technology: the decompression expansion refinement of the cyclone decompression expansion refinement mixer and the narrow slit cutting refinement of the narrow slit cutter, the production time of nano bubble high oxygen water is shorter than all previous nano bubble / high oxygen water technologies, energy saving and emission reduction, and simple structure and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] Figure 1 It is a structural schematic diagram of the present invention;

[0068] Figure 2 for Figure 1 Schematic diagram of the structure of the medium narrow slot cutter;

[0069] Figure 3 for Figure 2 A schematic diagram of the structure of the middle narrow slot cutting plate assembly;

[0070] Figure 4 for Figure 2 Schematic diagram of the structure of a veneer cut with a narrow slit;

[0071] Figure 5 for Figure 2 Schematic diagram of the structure of the odd-numbered narrow slit cutting board;

[0072] Figure 6 for Figure 2 Schematic diagram of the structure of the even-numbered narrow slit cutting plate;

[0073] Figure 7 for Figure 1 Schematic diagram of the structure of the medium-pressure cyclone;

[0074] Figure 8 for Figure 1 Schematic diagram of the structure of the medium cyclone decompression expansion refinement device.

[0075] Among them, 1 positioning sleeve, 2 polytetrafluoroethylene gasket, 3 positioning block, 4 O-ring, 5 cone hole intercepting plate, 6 gasket, 7 narrow slit cutting plate assembly, 8 locking sleeve, 9 narrow slit cutting single plate one, 10 narrow slit cutting single plate two, 11 narrow slit cutting single plate three, 12 narrow slit cutting single plate five, 13 narrow slit cutting single plate four, 14 upper positioning pin, 15 lower positioning pin, 16 narrow slit cutting blade, 17 narrow slit, 18 pressure gradient generating area, 19 oxygen source, 20 oxygen tank, 21 gas pressure reducing valve, 22 pressure gauge in oxygen tank, 23 oxygen pressure gauge, 24 gas flow meter, 25 needle valve, 26 water purification tank, 27 liquid flow regulating valve, 28 liquid flow meter, 29 aeration cyclone inlet water pressure gauge, 30 cyclone gas pipe, 31 aeration cyclone, 32 nano bubble water flow regulating valve, 33 nano bubble water pressure gauge, 34 cyclone reduction Pressure expansion and refinement device, 34.1 cyclone cavity cylindrical section, 34.2 cyclone cavity conical section, 35 safety valve, 36 first-level nano bubble water flow regulating valve, 37 narrow slit cutter, 38 nano bubble water tank pressure gauge, 39 nano bubble water tank, 40 nano bubble water release ball valve, 41 air and water pump pressure gauge, 42 air and water pump, 43 cyclone gas filling tank switch valve, 44 one-way valve, 45 gas filling pipe, 46 upper liquid level sensor, 47 lower liquid level sensor, 48 cyclone gas filling tank, 48.1 main tank, 48.2 auxiliary tank, 49 cyclone gas filling tank pressure gauge, 50 clean water pump pressure gauge, 51 clean water pump, 52 clean water tank switch valve, 53 nano bubble water tank emptying valve, 54 cyclone gas filling tank emptying valve, 55 nano bubble water, 56 gas-water mixture, 57 clean water, 58 electromagnetic gas switch valve, 59 cover, 60 water guide pipeline. DETAILED DESCRIPTION

[0076] In order to clearly illustrate the technical features of this solution, the present invention is described in detail below through specific implementation methods.

[0077] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0078] like Figure 1-8 As shown, the preparation system of the nano-scale oxygen bubbles comprises an oxygen source 19, an oxygen tank 20, a water purification tank 26, an aeration cyclone 31, a cyclone aeration tank 48, a cyclone decompression expansion refinement device 34, a narrow slit cutter 37 and a nano bubble water tank 39 which are arranged in sequence. The cyclone aeration tank 48 comprises a main tank 48.1 and a sub-tank 48.2, and an upper connecting air pipe and a lower connecting water pipe are arranged between the main tank and the sub-tank. The aeration cyclone 31 is arranged at the top of the cyclone aeration tank, and the bottom end of the aeration cyclone extends into the cyclone aeration tank and is arranged below the liquid level. A water pipeline is connected between the clean water tank 26 and the aerated cyclone 31, the inlet of the water pipeline is connected to the water outlet of the clean water tank, the outlet of the water pipeline is connected to the water inlet of the aerated cyclone, and a clean water tank switch valve 52 and a clean water pump 51 are arranged on the water pipeline; a cyclone gas pipe 30 is connected between the air inlet of the aerated cyclone 31 and the top of the cyclone gas tank; a gas pipeline is connected between the oxygen tank 20 and the auxiliary tank 48.2. A gas pressure reducing valve 21, an oxygen tank internal pressure gauge 22, and an oxygen pressure gauge 23 are arranged at the air outlet of the oxygen tank 20, and a gas flow meter 24, a needle valve 25, an electromagnetic gas switch valve 58, and a one-way valve 44 are arranged on the gas pipeline. The pressure at the oxygen tank outlet can be adjusted between 0.2-0.7 MPa, and the gas flow meter range is 5-100 lpm. Oxygen is connected from the outlet of the oxygen tank 20 to the bottom gas filling port of the auxiliary tank of the swirl gas filling tank 48 through the gas pipeline.

[0079] The water inlet of the aerated cyclone 31 is connected to the water outlet of the clean water pump 51 through the aerated cyclone inlet water pressure gauge 29, liquid flow regulating valve 27 and liquid flow meter 28 provided on the water delivery pipeline. A liquid outlet is provided at the bottom of the main tank, and a cyclone aeration tank emptying valve 54, a cyclone aeration tank switch valve 43, an air-water pump 42, an air-water pump pressure gauge 41, a nano bubble water flow regulating valve 32 and a nano bubble water pressure gauge 33 are provided on the pipeline connecting the liquid outlet of the main tank and the cyclone decompression expansion refinement device 34. A cyclone aeration tank pressure gauge 49 is also provided on the main tank. The auxiliary tank mainly realizes the gas filling function, and the upper liquid level sensor 46 and the lower liquid level sensor 47 are installed at the bottom of the auxiliary tank; the upper part of the cyclone gas filling tank 48 is pure oxygen, and the lower part is a gas-water mixture. The oxygen is not added directly through the overflow port of the gas filling cyclone 31, but added at the bottom of the auxiliary tank 48.2, and enters the upper space of the cyclone gas filling tank in the form of large bubbles. The gas-water mixture is initially mixed in the cyclone cavity of the gas filling cyclone, and then the gas-water mixture enters the lower liquid space of the cyclone gas filling tank 48 from the bottom flow port of the gas filling cyclone. Part of the oxygen in the lower space of the cyclone gas filling tank is dissolved in water, and the undissolved oxygen enters the upper space of the cyclone gas filling tank. The gas filling pipe 45 extending into the bottom of the auxiliary tank is part of the gas transmission pipeline.

[0080] The cyclone decompression expansion and refinement device 34 is modified from a gas-liquid cyclone separator, and the internal space structure remains unchanged, that is, it includes a cyclone chamber cylindrical section 34.1 inside the gas-liquid cyclone separator and a cyclone chamber conical section 34.2 at the bottom, but the overflow port of the gas-liquid cyclone separator is sealed with a cover 59. The bottom of the cyclone chamber conical section of the cyclone decompression expansion and refinement device 34 is connected to the bottom flow port, which is connected to the water conduit 60. The bottom flow port and the water conduit have the same diameter, and the diameter of the cylindrical section of the cyclone decompression expansion and refinement device 34 is 3 times greater than the diameter of the water conduit. A first-level nano bubble water flow regulating valve 36 is set on the water conduit 60. After the gas-water mixture discharged from the liquid outlet at the bottom of the main pipe enters the cyclone decompression expansion and refinement device 34, the cross-sectional area of ​​the cylindrical section of the cyclone cavity of the cyclone decompression expansion and refinement device 34 suddenly increases, the water flow velocity of the gas-water mixture decreases, the static pressure increases, the bubbles are compressed, the internal pressure of the bubbles increases, some bubbles burst, and the gas dissolves in the water; as the cross-sectional area of ​​the conical section of the cyclone cavity of the cyclone decompression expansion and refinement device 34 gradually decreases along the water flow direction, the water flow velocity increases, the static pressure decreases, and the undissolved part of the oxygen in the water suddenly expands, breaks away from the constraints of the molecular bond energy of the water molecules, becomes free oxygen, and dissolves in the water, thus forming a first-level nano bubble high oxygen water, which is a first-level bubble refined dissolved oxygen; the cyclone decompression expansion and refinement device also plays a role in strengthening the gas-liquid mixing.

[0081] The narrow slit cutter connected to the swirl decompression expansion refinement device 34 is arranged in the nano bubble water tank 39. The narrow slit cutter includes a cutoff plate, a narrow slit cutting plate assembly 7 and a fixing sleeve for connecting and fixing the cutoff plate and the narrow slit cutting plate assembly; the cutoff plate is a conical hole cutoff plate 5; the fixing sleeve is composed of a positioning sleeve 1, a positioning block 3 and a locking sleeve 8, the positioning sleeve and the positioning block are used to position the conical hole cutoff plate 5, the locking sleeve 8 is sleeved on the outside of the conical hole cutoff plate and the narrow slit cutting plate assembly and locked with the inner side of the rear part of the positioning sleeve 1, a polytetrafluoroethylene gasket 2 is arranged between the positioning block 3 and the positioning sleeve 1, an O-ring 4 is arranged between the positioning block and the positioning sleeve, and a gasket 6 is arranged between the conical hole cutoff plate 5 and the narrow slit cutting plate assembly 7. The narrow slit cutting plate assembly 7 is composed of 5 narrow slit cutting single plates, which are marked as narrow slit cutting single plate 1 9, narrow slit cutting single plate 2 10, narrow slit cutting single plate 3 11, narrow slit cutting single plate 4 13, and narrow slit cutting single plate 5 12 in sequence along the water flow direction. The narrow slit cutting single plates are all circular, and each narrow slit cutting single plate is provided with uniformly distributed radial narrow slits 17 starting from the center of the circle, with a narrow slit thickness of 3mm, a narrow slit width of 0.5mm, and 8 narrow slits. The narrow slit positions form narrow slit fluid channels for water flow to pass through, and the edges of the narrow slits act as narrow slit cutting blades 16 for cutting water flow when the fluid passes through. The length of the narrow slit is calculated based on the amount of water to be treated to ensure that the flow rate of water flowing through the narrow slit is 80-100m / s. The five narrow slit cutting plates are arranged along the water flow direction as follows: the narrow slits of the narrow slit cutting plates 1 9, 3 11, and 5 12 are projected in the same direction along the water flow, and the narrow slits of the narrow slit cutting plates 2 10 and 4 13 are projected in the same direction along the water flow; at the same time, the projections of the narrow slits of the narrow slit cutting plates 2 10 and 4 13 along the water flow direction are staggered by 1.79° from the projections of the narrow slit cutting plates 1, 3 11, and 5 12 along the water flow direction, forming a partial overlap. The five narrow slit cutting plates are positioned by two cylindrical positioning pins, the cylindrical positioning pin provided at the upper part of the narrow slit cutting plate assembly is the upper positioning pin 14, and the cylindrical positioning pin provided at the lower part of the narrow slit cutting plate assembly is the lower positioning pin 15. The spacing distance between adjacent narrow slit cutting plates is 0.7mm, and the spacing is achieved by a circular concave groove, the diameter of which is 4-6mm smaller than the outer diameter of the narrow slit cutting plate. When water flows through, the circular concave groove forms a pressure gradient generating area 18 together with one side of the adjacent narrow slit cutting single plate. In this way, the ends of adjacent narrow slit cutting single plates are sealed, a spacing cavity is formed between the end of one side of the narrow slit cutting single plate and the center of the circle, and a structure of radial narrow slits is set on the narrow slit cutting single plate corresponding to the spacing cavity. The outlet of the water guide pipe is sealed and connected to the inlet side of the fixed sleeve.

[0082] The nano bubble water tank can play a buffering role. A nano bubble water tank pressure gauge 38 is installed on the upper part of the nano bubble water tank to observe the pressure changes in the tank; a fully open and closed safety valve 35 is installed on the top of the tank to prevent the pressure in the tank from overloading. An online dissolved oxygen concentration detector is installed in the middle of the tank to monitor the dissolved oxygen concentration in the tank at any time (not shown in the figure). A drainage waterway is set at the bottom of the nano bubble water tank for connecting the nano bubble water tank and the water terminal equipment. A nano bubble water release ball valve 40 is set on the drainage waterway, and a nano bubble water tank emptying valve 53 is also set on the pipeline set at the bottom of the nano bubble water tank outside the drainage pipeline.

[0083] The first-level nano-bubble high-oxygen water treated by the swirl decompression expansion refinement device 34 enters the narrow slit cutter 37. As the cross-sectional area of ​​the conical hole of the conical hole intercepting plate 5 gradually decreases, the static pressure of the water flow continues to decrease, and the undissolved oxygen in the water gradually expands, breaking away from the constraints of the molecular bond energy of water molecules, becoming free oxygen and dissolving into the water. Then the water carries the bubbles into the cutting area of ​​the narrow slit cutting plate. As the water flow area decreases, the water flow velocity increases, and the cutting force is strengthened. At the same time, there are a large number of water flow velocity gradients and pressure gradients between the narrow slit cutting single plates, and the large bubbles are further sheared to form a large number of secondary nano-scale bubbles. This is the secondary bubble refinement of dissolved oxygen. The diameter of the nano-bubbles is about 500nm, and the dissolved oxygen concentration reaches 80-120mg / L.

[0084] The process of preparing nano-scale oxygen bubbles using the above preparation system is as follows:

[0085] 1. Before the preparation system starts working, close the gas pressure reducing valve 21 of the oxygen tank 20; close the water tank switch valve 52 of the water tank 26; close the gas tank switch valve 43 of the swirl gas tank 48; and close the nano bubble water release ball valve 40 of the nano bubble water tank 39.

[0086] 2. The raw water enters the water purification tank 26 after coarse filtration, fine filtration, ion exchange resin treatment, ultrafiltration (or reverse osmosis treatment) and hydrophobic hollow fiber membrane vacuum degassing (the oxygen content in the raw water is less than 1 mg / L). Start the clean water pump 51 to supply clean water 57 to the cyclone gasifier 48, and at the same time open the gas switch valve of the medical oxygen cylinder (or start the medical oxygen concentrator), adjust the pressure of the oxygen tank 20 outlet to 0.3-0.6MPa, and adjust the gas flow to 5-20lpm with the gas flow regulating needle valve 25. Oxygen is added to the bottom of the auxiliary tank 48.2 of the cyclone gasifier 48 through the gas transmission pipeline, and enters the upper space of the cyclone gasifier 48 in the form of large bubbles. The gas-water mixture is preliminarily mixed in the cyclone cavity of the gas cyclone 31, and then the gas-water mixture enters the lower space of the cyclone gasifier 48 from the bottom flow port of the gas cyclone 31. Part of the oxygen in the lower space of the cyclone gasifier 48 dissolves into the water, and the undissolved oxygen enters the upper space of the cyclone gasifier 48. The upper space of the swirl gas tank 48 is continuously consumed as part of the oxygen is dissolved in the water, and the liquid level in the swirl gas tank 48 is continuously rising. In order to maintain the basic balance of the liquid level in the swirl gas tank 48 or to maintain the pressure in the swirl gas tank 48 basically unchanged, as the oxygen is consumed, the liquid level in the swirl gas tank 48 rises. When it rises to the upper liquid level sensor 47, the sensor sends a signal to open the electromagnetic gas switch valve 58, oxygen enters the swirl gas tank 48, the air pressure in the upper space of the swirl gas tank 48 increases, and the liquid level in the swirl gas tank 48 decreases. When it drops to the lower liquid level sensor 46, the sensor sends a signal to close the electromagnetic gas switch valve 58, oxygen cannot enter the swirl gas tank 48, and the air pressure in the upper space of the swirl gas tank 48 decreases. In this reciprocating cycle, the liquid level in the swirl gas tank 48 is basically balanced, and the pressure in the swirl gas tank 48 is maintained basically unchanged. The liquid flow regulating valve 27 is used to adjust the input water volume and pressure of the aeration cyclone 31 to the optimal value, and the flow rate and pressure are read on the liquid flow meter 28 and the cyclone inlet water pressure gauge 29.

[0087] 3. After the liquid level in the cyclone gasifier 48 reaches the ideal position, the drain switch valve 43 of the cyclone gasifier is opened, and the gas-water pump 42 is started. The primary gas-water mixed liquid 56 in the cyclone gasifier 48 is pressurized by the gas-water pump 42, and then enters the cyclone decompression expansion refiner 34 to refine the bubbles, forming the primary nano bubble high oxygen water, and then enters the narrow slit cutter 37 to further cut and refine the bubbles, and finally enters the nano bubble water tank 39 to become the secondary nano bubble high oxygen water 55, the diameter of the nano bubble is about 500nm, and the dissolved oxygen concentration can reach 100-120mg / L.

[0088] 4. Finally, open the gate valve of the drainage waterway at the bottom of the nano bubble water tank 39 to connect the nano bubble water tank 39 with the water inlet pipe of the water terminal device, and the secondary nano bubble high oxygen water 55 enters the water terminal device.

[0089] The above specific implementation manner cannot be used as a limitation on the protection scope of the present invention. For those skilled in the art, any substitution, improvement or change made to the implementation manner of the present invention falls within the protection scope of the present invention.

[0090] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. A system for preparing nano-scale oxygen bubbles, characterized in that: include: A gas-liquid mixing device, the gas-liquid mixing device comprising an oxygen supply device, a water purification tank, an aerated cyclone and a cyclone aerator; the water purification tank is connected to the cyclone aerator via the aerated cyclone, and the oxygen supply device is connected to the cyclone aerator; A first-stage refinement device, the first-stage refinement device includes a cyclone decompression expansion refinement device, and the cyclone decompression expansion refinement device is connected to the liquid outlet at the bottom end of the cyclone gasification tank through a pipeline; A secondary refinement device, the secondary refinement device comprising a nano bubble water tank and a narrow slit cutter arranged therein, the narrow slit cutter being connected to the cyclone decompression expansion refinement device via a pipeline; The cyclone gasification tank comprises a main tank and a sub-tank which are connected to each other; the gasification cyclone is arranged in the main tank, the water purification tank is connected to the gasification cyclone via a water pipeline, and the oxygen supply device is connected to the sub-tank via a gas pipeline; the cyclone decompression expansion refinement device is connected to the liquid outlet at the bottom of the main tank via a pipeline; The bottom outlet of the aerating cyclone is extended into the liquid level below the main tank, and the outlet of the gas pipeline connected to the oxygen supply device is extended into the liquid level below the auxiliary tank; a cyclone aerating pipe is provided between the top of the cyclone aerating tank and the aerating cyclone; The aerated cyclone is a pipe with a funnel-shaped internal cavity; an upper air pipe and a lower water pipe are provided between the main tank and the auxiliary tank, the upper air pipe is used to connect the upper gas space of the main tank and the auxiliary tank, and the lower water pipe is used to connect the liquid space in the main tank and the auxiliary tank; A bottom flow port is arranged at the bottom end of the cyclone decompression expansion and refinement device, and the bottom flow port extends into the nano bubble water tank through a water guide pipe and is connected to the narrow slit cutter. A liquid inlet pipe is connected to the outer side of the top of the cyclone decompression expansion and refinement device, and the liquid inlet pipe is connected to the liquid outlet of the cyclone gasification tank through an air-water pump.

2. The system for preparing nano-scale oxygen bubbles according to claim 1, characterized in that: A control valve is arranged on the gas transmission pipeline, and a swirl gas tank pressure gauge, an upper liquid level sensor and a lower liquid level sensor are arranged on the swirl gas tank.

3. The system for preparing nano-scale oxygen bubbles according to claim 1, characterized in that: The narrow slot cutter comprises a flow intercepting plate, a narrow slot cutting plate assembly and a fixing sleeve for connecting and fixing the flow intercepting plate and the narrow slot cutting plate assembly; a flow intercepting channel is arranged in the flow intercepting plate, and the opening of the flow intercepting channel is arranged to be gradually reduced; a plurality of spacing cavities are arranged at intervals along the water flow direction on the plate surface of the narrow slot cutting plate assembly, and radial narrow slot groups are arranged on the narrow slot cutting plate assembly outside each spacing cavity, and the narrow slot groups are arranged to partially overlap along the water flow direction.

4. The system for preparing nano-scale oxygen bubbles according to claim 3, characterized in that: The narrow slit cutting plate assembly is composed of a plurality of narrow slit cutting single plates, the ends of adjacent narrow slit cutting single plates are sealed, the spacing cavity is arranged on one side of each narrow slit cutting single plate, and adjacent narrow slit cutting single plates are arranged at intervals through the spacing cavity; the narrow slit group is arranged on the narrow slit cutting single plate corresponding to each spacing cavity; and a positioning piece for fixing and connecting each narrow slit cutting single plate is arranged on the narrow slit cutting plate assembly.

5. The system for preparing nano-scale oxygen bubbles according to claim 4, characterized in that: The narrow slit group includes 4-10 narrow slits, each of which extends radially from the position where the central axis of the narrow slit cutting plate assembly is located as the starting point; the thickness of the narrow slit along the water flow direction is 2-5mm; the width of the narrow slit along the board surface direction of the narrow slit cutting plate assembly is 0.1-1mm; the thickness of the partition cavity along the water flow direction is 0.7mm; The number of narrow slit cutting single plates constituting the narrow slit cutting plate assembly is an odd number, the narrow slit groups of the odd number narrow slit cutting single plates have the same projection along the water flow direction, and the narrow slit groups of the even number narrow slit cutting single plates have the same projection along the water flow direction; the projection of the narrow slit group of the odd number narrow slit cutting single plates along the water flow direction is staggered by 1.5°-2.0° from the projection of the narrow slit group of the even number narrow slit cutting single plates along the water flow direction.

6. The preparation process of the preparation system according to any one of claims 4 or 5, characterized in that: The steps are as follows: (1) Gas-liquid mixing: using cyclone aeration to obtain a gas-water mixture; (2) Primary refinement: The gas-water mixture is transported to a cyclone decompression expansion refinement device for treatment to obtain primary nanobubble water; (3) Secondary refinement: The first-level nanobubble water is further cut by a narrow slit cutter to obtain nano-scale oxygen bubbles.

7. The preparation process according to claim 6, characterized in that: In step (1), the gas-liquid mixing is to input the purified water and oxygen into the cyclone gasification tank by cyclone mixing, wherein the oxygen pressure at the outlet of the oxygen tank is 0.2-0.7 MPa and the oxygen flow rate is 5-100 lpm; in step (2), the gas-water mixed liquid is transported to the cyclone decompression expansion refinement device, and the gas-water mixed liquid realizes the changes of water flow velocity, static pressure and bubble contraction and expansion through the cyclone cavity cylindrical section and the cyclone cavity conical section of the cyclone decompression expansion refinement device; in step (3), the primary nano bubble water discharged from the water guide pipe is received, and a large amount of water flow velocity gradient and pressure gradient existing between the single plates are cut through the narrow slit of the narrow slit cutter, and the large bubbles are further sheared to form secondary nano bubbles.

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