CN115364705A - Combined micro-nano bubble generating device - Google Patents
Combined micro-nano bubble generating device Download PDFInfo
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- CN115364705A CN115364705A CN202210991030.8A CN202210991030A CN115364705A CN 115364705 A CN115364705 A CN 115364705A CN 202210991030 A CN202210991030 A CN 202210991030A CN 115364705 A CN115364705 A CN 115364705A
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- 239000002101 nanobubble Substances 0.000 title claims abstract description 42
- 239000007788 liquid Substances 0.000 claims abstract description 123
- 238000009987 spinning Methods 0.000 claims abstract description 16
- 239000012530 fluid Substances 0.000 claims abstract description 15
- 238000010008 shearing Methods 0.000 claims abstract description 7
- 230000009471 action Effects 0.000 claims abstract description 6
- 238000003780 insertion Methods 0.000 claims description 6
- 230000037431 insertion Effects 0.000 claims description 6
- 239000007789 gas Substances 0.000 description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 238000004088 simulation Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
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- 230000000694 effects Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
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- 238000000034 method Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 235000014676 Phragmites communis Nutrition 0.000 description 2
- 238000009360 aquaculture Methods 0.000 description 2
- 244000144974 aquaculture Species 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000003796 beauty Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000006213 oxygenation reaction Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
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- 230000007613 environmental effect Effects 0.000 description 1
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- 230000002262 irrigation Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/235—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids for making foam
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/20—Jet mixers, i.e. mixers using high-speed fluid streams
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/60—Pump mixers, i.e. mixing within a pump
- B01F25/64—Pump mixers, i.e. mixing within a pump of the centrifugal-pump type, i.e. turbo-mixers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
Abstract
The invention provides a combined micro-nano bubble generator which comprises a self-rotating gas-liquid mixing nozzle, a vortex pump, a backwater self-sucking pipe and an outlet three-way pipe, wherein the self-rotating gas-liquid mixing nozzle is connected with the vortex pump; one branch of the outlet of the vortex pump is communicated with a liquid inlet of the self-rotating gas-liquid mixing nozzle through a backwater self-sucking pipe, the backwater self-sucking pipe close to the liquid inlet is communicated with a liquid inlet, and liquid is supplemented into the backwater self-sucking pipe through the liquid inlet by utilizing the jet flow self-sucking function of the backwater self-sucking pipe; the outlet of the spinning gas-liquid mixing nozzle is communicated with the inlet of the vortex pump, the spinning gas-liquid mixing nozzle is provided with a gas inlet, and gas is mixed with liquid along the tangential direction of jet flow in a self-suction manner by utilizing negative pressure generated by jet flow; the gas-liquid mixed fluid is in a micro-nano bubble form in the gas-liquid mixed fluid by utilizing the rotation and shearing action of the vortex pump. The invention utilizes the rotation and shearing action of the vortex pump to break the bubbles in the liquid into micro-nano-scale bubbles.
Description
Technical Field
The invention relates to a bubble generating device, in particular to a combined micro-nano bubble generating device.
Background
The micro-nano bubbles generally mean that the diameter of the micro-nano bubbles contained in the liquid is 10 -8 ～10 -6 m, or a small bubble. The micro-nano bubbles have small bubble diameter, so the micro-nano bubbles have the advantages of slow rising speed, large specific surface area, point on the surface, self pressurization and dissolution, high gas dissolution rate, hydroxyl radical generation and the like in a solution, and have special physical and chemical characteristics, so the micro-nano bubbles are preliminarily applied to the fields of aquaculture, soilless culture, fruit and vegetable cleaning, beauty and skin care, water environment treatment, sewage treatment and the like.
The diameter of the micro-nano bubbles is small, the generation process is extremely difficult to control, and the main generation means at present comprises the schemes of high-pressure air dissolving, high-speed rotary cutting, cavitation technology utilization and the like, and the schemes usually adopt complex equipment or have high energy consumption. Therefore, a convenient and low-energy-consumption micro-nano bubble generation scheme is needed.
The prior art discloses a micro-nano bubble dissolved oxygen generator, and the device mixes with gas after flowing liquid spiral pressure boost to adopt the supersound reed to decompose the bubble breakage, the device simple structure and energy-conservation, but the effect area of reed is limited, can not guarantee to decompose the major bubble of the overwhelming majority into micro-nano bubble. The prior art discloses an array electrode type microbubble generating device which mainly generates microbubbles by electrolyzing water and aims to reduce drag of an underwater vehicle, the structure of the device is complex, and the electrolysis process consumes more electric energy. The prior art discloses an oxygenation ejector, which is used for aquaculture and can not break large bubbles into micro-nano level, although a three-way pipe is also used for mixing gas and liquid.
The prior art discloses that bubbles in liquid can not be effectively subjected to micro-nano treatment, or the structure is complex, the energy consumption is high, and micro-nano bubbles can not be simply and effectively generated.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a combined micro-nano bubble generating device, which adopts a self-rotating gas-liquid mixing nozzle to uniformly mix gas into liquid, then inserts mixed fluid into a vortex pump, and further breaks bubbles in the liquid into micro-nano level by utilizing the rotation and shearing action of the vortex pump. The device also utilizes a water return pipeline to overcome the defect of weak self-absorption effect of the vortex pump, and the water inlet pipe and the air inlet pipe do not need to provide pressure.
The present invention achieves the above-described object by the following technical means.
A combined micro-nano bubble generator comprises a self-rotating gas-liquid mixing nozzle, a vortex pump, a backwater self-sucking pipe and an outlet three-way pipe; one branch of the outlet of the vortex pump is communicated with a liquid inlet of the self-rotating gas-liquid mixing nozzle through a backwater self-sucking pipe, the backwater self-sucking pipe close to the liquid inlet is communicated with a liquid inlet, and liquid is supplemented into the backwater self-sucking pipe through the liquid inlet by utilizing the jet flow self-sucking function of the backwater self-sucking pipe; the outlet of the spinning gas-liquid mixing nozzle is communicated with the inlet of the vortex pump, the spinning gas-liquid mixing nozzle is provided with a gas inlet, and gas is mixed with liquid along the tangential direction of jet flow in a self-suction manner by utilizing negative pressure generated by jet flow; the gas-liquid mixed fluid utilizes the rotation and shearing action of the vortex pump to make the gas in the gas-liquid mixed fluid be in the form of micro-nano bubbles.
Further, the self-rotating gas-liquid mixing nozzle comprises an inlet section, a middle section and an outlet section; one end of the inlet section is communicated with a backwater self-priming pipe, one end of the outlet section is communicated with a gas-liquid outlet of the middle section, and the other end of the outlet section is communicated with an inlet of the vortex pump; the other end of the inlet section penetrates through the liquid inlet of the middle section, and the other end of the inlet section is inserted into one end of the outlet section; the middle section is provided with a gas inlet, and one end of the outlet section is circumferentially provided with a plurality of self-rotating gas inlets; the self-rotating air inlet is opposite to the air inlet.
Further, the inlet section includes import, export and entry convergent structure, the import is used for connecting the return water self-priming pipe, be equipped with entry convergent structure between import and the export, the convergent ratio D of entry convergent structure 1 /D 2 The value range is 1.5-2.5, wherein D 1 Is the inlet diameter, D 2 The exit diameter allows the incoming liquid to be accelerated before mixing with the gas.
Further, the inlet tapered structure length L 1 And inlet diameter D 1 The value range of the ratio of (A) is 1-2; a taper angle a of the inlet taper structure 1 Taking the angle of 20-50 degrees.
Furthermore, a spin gas-liquid mixing cavity is arranged in the middle section, the spin gas-liquid mixing cavity is communicated with a gas inlet, and one end of the outlet section provided with a plurality of spin gas inlets is located in the spin gas-liquid mixing cavity.
Furthermore, the number of the self-rotating air inlets is 3-10, and the diameter of the self-rotating air inlets is 0.5-2.5 mm.
Furthermore, an included angle alpha between the central line of the self-rotating air inlet hole and the flow direction x Taking 60 +/-15 degrees, wherein the included angle alpha between the center line of the self-rotating air inlet hole and the radial direction y Take 30 ° ± 15 °.
Further, the outlet section is sequentially provided with an insertion section, a throat, an outlet gradually-expanding section and an outlet of the outlet section in the flow direction; a plurality of self-rotating air inlets are circumferentially arranged on the insertion section; diameter D of the throat pipe 3 And outlet diameter D of the outlet section 4 The value range of the ratio is 0.2-0.8, the mixed fluid can be gradually decelerated by the throat and the gradually expanding section of the outlet, the turbulence degree is reduced, and the separation of bubbles from the liquid can be reduced.
Further, the length L of the throat pipe 2 The ratio of the diameter of the throat pipe to the diameter of the throat pipe is 1 to 1.8; length L of the outlet divergent section 3 The ratio of the diameter of the throat pipe to the diameter of the throat pipe is 3-6, and the divergent angle alpha of the divergent section of the outlet is 2 Is 8-15 degrees.
Further, the vortex pump is a semi-open vortex pump, and blades of the semi-open vortex pump are V-shaped; the difference between the open type vortex pump and the closed type vortex pump is that the position of the inlet and the position of the outlet corresponding to the impeller are positioned in the middle of each blade, so that the defect that the closed type vortex pump cannot timely discharge gas for gas-liquid two-phase flow is avoided, and the defect that the open type vortex pump is low in efficiency is also avoided. The gas-liquid ratio of the outlet of the self-rotating gas-liquid mixing nozzle is 5-15%. Each blade of the semi-open type vortex pump adopts a V-shaped blade, so that fluid can be gathered, and the mixture can be discharged in time.
The invention has the beneficial effects that:
1. according to the combined micro-nano bubble generating device, gas and liquid are primarily mixed through the spin gas-liquid mixing nozzle, the spin gas-liquid mixing nozzle enables the gas to be spirally and uniformly mixed in the liquid due to the existence of spin holes, then the primarily mixed liquid is introduced into the vortex pump, and then micro-nano bubbles are further generated by the aid of high-speed rotation and shearing force of the vortex pump.
2. The combined micro-nano bubble generating device adopts a backwater self-sucking pipe to re-introduce part of mixed liquid leaving the vortex pump into a gas-liquid mixing nozzle, sucks low-pressure water at an inlet into the nozzle by using pressure difference generated by jet flow without pressurizing inlet fluid, and simultaneously adopts a reducing structure in the gas-liquid mixing nozzle to reduce pressure and increase speed of incoming liquid, so that low pressure is generated in a gas-liquid mixing cavity, gas can be automatically sucked, and an air pump is not required. The combined structure adopted by the invention can fully mix gas and liquid, further smash bubbles into a micro-nano form, and has the advantages of simple structure, simple equipment, energy conservation and environmental protection.
3. According to the combined micro-nano bubble generating device, the pressure in the gas-liquid mixing cavity is low due to the high-speed jet flow at the inlet section of the nozzle, so that gas can be sucked automatically, and the gas enters from the gas inlet of the three-way connecting pipe and then is mixed with the high-speed fluid in the middle through the self-rotating hole. The gas in the mixed fluid is clearly observed to be spirally distributed in the liquid through computer numerical simulation, and as can be seen in fig. 7, the simulation result shows that the gas enters the mixing nozzle and is spirally doped in the liquid, and the bubble flow is dispersed and uniformly mixed in the liquid along with the lapse of mixing time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly introduced below, and the drawings in the following descriptions are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a combined micro-nano bubble generating device according to the present invention.
Fig. 2 is a schematic structural view of the self-rotating gas-liquid mixing nozzle according to the present invention.
FIG. 3 is a view showing the structure of an inlet section of the spinning gas-liquid mixing nozzle.
Fig. 4 is a middle structure diagram of the spin gas-liquid mixing nozzle.
FIG. 5 is a view showing the structure of an outlet section of the spinning gas-liquid mixing nozzle.
Figure 6 is a cross-sectional view of the vortex pump.
Fig. 7 is a gas-liquid distribution cloud obtained by computer simulation.
In the figure:
1-self-rotating gas-liquid mixing nozzle; 2-a vortex pump; 3-a backwater self-sucking pipe; 4-an outlet three-way pipe; 5-inlet three-way pipe; 11-an inlet section; 12-middle section; 13-an outlet section; 111-an inlet; 112-inlet tapered structure; 121-gas inlet; 122-a spin gas-liquid mixing cavity; 131-spin intake; 132-an outlet divergent; 133-outlet section outlet; 134-throat pipe; 21-vortex pump inlet; 22-vortex pump outlet; 23-a vortex pump impeller; 23 a-vortex pump blades; 51-a liquid inlet; 41-micro nano bubble mixed liquid outlet.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the figures, which are based on the orientation or positional relationship shown in the figures, and are used for convenience in describing the present invention and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1, the combined micro-nano bubble generator of the invention comprises a self-rotating gas-liquid mixing nozzle 1, a vortex pump 2, a backwater self-priming pipe 3 and an outlet three-way pipe 4; an outlet three-way pipe 4 is installed at an outlet of the vortex pump 2, the outlet three-way pipe 4 is provided with 2 outlet branches, one outlet branch is communicated with a liquid inlet of the self-rotating gas-liquid mixing nozzle 1 through a water return self-sucking pipe 3, the other outlet branch is a micro-nano bubble mixed liquid outlet 41, and the cross-sectional area of the micro-nano bubble mixed liquid outlet 41 is larger than that of the outlet branch communicated with the water return self-sucking pipe 3. The backwater self-sucking pipe 3 close to the liquid inlet is communicated with the liquid inlet 51, and liquid is supplemented into the backwater self-sucking pipe 3 through the liquid inlet 51 by utilizing the jet self-sucking function of the backwater self-sucking pipe 3; the outlet of the spinning gas-liquid mixing nozzle 1 is communicated with the inlet of the vortex pump 2, the spinning gas-liquid mixing nozzle 1 is provided with a gas inlet, and gas is mixed with liquid along the tangential direction of jet flow in a self-suction manner by utilizing negative pressure generated by jet flow; the gas-liquid mixed fluid is in a micro-nano bubble form in the gas-liquid mixed fluid by utilizing the rotation and shearing action of the vortex pump 2. An inlet three-way pipe 5 is arranged between the backwater self-sucking pipe 3 and the liquid inlet of the self-rotating gas-liquid mixing nozzle 1, and a liquid inlet 51 is arranged on the inlet three-way pipe 5.
As shown in fig. 2, the spinning gas-liquid mixing nozzle 1 includes an inlet section 11, a middle section 12, and an outlet section 13; one end of the inlet section 11 is communicated with the backwater self-priming pipe 3, one end of the outlet section 13 is communicated with a gas-liquid outlet of the middle section 12, and the other end of the outlet section 13 is communicated with an inlet of the vortex pump 2; the other end of the inlet section 11 penetrates through the liquid inlet of the middle section 12, and the other end of the inlet section 11 is inserted into one end of the outlet section 13; the middle section 12 is provided with a gas inlet 121, and one end of the outlet section 13 is circumferentially provided with a plurality of self-rotating gas inlets 131; the spin gas inlet hole 131 faces the gas inlet 121. The inlet section 11, the intermediate section 12 and the outlet section 13 are connected by screw-fit.
As shown in fig. 3, the inlet section 11 includes an inlet 111, an outlet and an inlet tapered structure 112, the inlet 111 is used for connecting to the backwater self-priming pipe 3, the inlet tapered structure 112 is disposed between the inlet 111 and the outlet, and the tapered ratio D of the inlet tapered structure 112 1 /D 2 The value range is 1.5-2.5, wherein D 1 Is the diameter of the inlet 111, D 2 Is the outlet diameter. The inlet isTapered structure 112 length L 1 And the diameter D of the inlet 111 1 The value range of the ratio of (A) to (B) is 1-2; the taper angle a of the inlet taper 112 1 Taking 20-50 degrees. The inlet tapering structure 112 may increase the velocity of the incoming liquid prior to mixing with the gas.
As shown in fig. 4, a spin gas-liquid mixing cavity 122 is disposed in the middle section 12, the spin gas-liquid mixing cavity 122 is communicated with the gas inlet 121, and one end of the outlet section 13 having a plurality of spin gas inlets 131 is disposed in the spin gas-liquid mixing cavity 122.
As shown in fig. 5, the outlet section 13 is provided with an insertion section, a throat 134, an outlet divergent section 132 and an outlet section outlet 133 in sequence along the flow direction; a plurality of self-rotating air inlets 131 are circumferentially arranged on the insertion section; diameter D of the throat 134 3 And outlet section outlet 133 diameter D 4 The value range of the ratio is 0.2-0.8. Length L of the throat 2 The ratio of the diameter of the throat pipe 134 to the diameter of the throat pipe is 1-1.8; the length L of the outlet divergent section 132 3 The ratio of the diameter of the throat pipe 134 to the diameter of the throat pipe 134 is 3-6, and the divergent angle alpha of the outlet divergent section 132 2 Is 8-15 degrees. The number of the self-rotating air inlet holes 131 is 3-10, and the diameter of the self-rotating air inlet holes 131 is 0.5-2.5 mm. The spin air inlets 131 are spirally distributed on the pipe wall, and the center line of the spin air inlets 131 is viewed on the cross section view, and the included angle alpha between the center line of the spin air inlets 131 and the flow direction x Taking 60 +/-15 degrees; when the central line of the self-rotating air inlet hole 131 is seen from the left view, the central line of the self-rotating air inlet hole 131 forms an included angle alpha with the radial direction y Take 30 ° ± 15 °.
A plurality of the spinning air inlets 131 can be arranged in the embodiment, the number of the spinning air inlets 131 is 8 in the embodiment, the gas volume ratio of the mixed liquid generated by the device is controlled to be about 9% by controlling the diameter of the spinning air inlets 131, and the diameter of the air inlet selected in the embodiment is 2mm.
As shown in fig. 6, the vortex pump 2 is a semi-open vortex pump, and the vane 23a of the semi-open vortex pump is in a V shape; the positions of the vortex pump inlet 21 and the vortex pump outlet 22 corresponding to the vortex pump impeller 23 are at the middle position of each vane. The gas-liquid ratio of the outlet of the self-rotating gas-liquid mixing nozzle 1 is 5-15%.
As shown in fig. 7, the specific dimension is more suitable for different working conditions and fluid media by computer numerical simulation. In the embodiment, the air and water are mixed as an example, the flow rate of the inlet of the nozzle is set to be 1m/s, the pressure of the gas inlet is set to be atmospheric pressure in the simulation process, the volume fraction of the obtained gas at the outlet of the nozzle is 8.79%, and the gas volume distribution cloud charts on 4 cross sections, namely horizontal, vertical and two oblique cross sections, are observed to obtain the distribution condition of gas and liquid phases in the nozzle. Under other implementation conditions, when the simulation result shows that the gas-liquid mixing ratio meets the requirements of the working condition and the bubbles are uniformly distributed in the water, the size of the gas-liquid mixing nozzle more suitable for the working condition is obtained.
The semi-open type vortex pump used in the present embodiment is arranged as shown in the figure, and the rotation direction of the impeller is counterclockwise.
The backwater self-priming pipe 3 enables part of mixed liquid at the outlet of the vortex pump to flow back to the inlet of the self-rotating gas-liquid mixing nozzle 1, the pressure of the liquid inlet 51 is reduced to achieve the self-priming effect, and the problem that the self-priming of the vortex pump is weak is solved. The flow of the backwater self-priming pipe accounts for 30% -40% of the flow of the vortex pump outlet.
When the liquid inlet 51 has higher pressure or a supercharging device exists, the water self-sucking pipe 3 can be eliminated, the inlet of the self-rotating gas-liquid mixing nozzle 1 is used as the device inlet, and the outlet 22 of the vortex pump is used as the device outlet.
The combined micro-nano bubble generating device can be applied to the fields of chemical processes, cultivation oxygenation, oxygen-containing irrigation, sewage treatment, beauty treatment, skin care and the like which need micro-nano bubble mixed liquid.
It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (10)
1. A combined micro-nano bubble generator is characterized by comprising a self-rotating gas-liquid mixing nozzle (1), a vortex pump (2) and a backwater self-sucking pipe (3);
a branch at the outlet of the vortex pump (2) is communicated with a liquid inlet of the self-rotating gas-liquid mixing nozzle (1) through a backwater self-sucking pipe (3), the backwater self-sucking pipe (3) close to the liquid inlet is communicated with a liquid inlet (51), and liquid is supplemented into the backwater self-sucking pipe (3) through the liquid inlet (51) by utilizing the jet flow self-sucking function of the backwater self-sucking pipe (3); the outlet of the spinning gas-liquid mixing nozzle (1) is communicated with the inlet of the vortex pump (2), the spinning gas-liquid mixing nozzle (1) is provided with a gas inlet, and gas is mixed with liquid along the tangential direction of jet flow in a self-suction manner by utilizing negative pressure generated by jet flow; the gas-liquid mixed fluid utilizes the rotation and shearing action of the vortex pump (2) to lead the gas to be in the micro-nano bubble form in the gas-liquid mixed fluid.
2. The combined micro-nano bubble generator according to claim 1, wherein the spinning gas-liquid mixing nozzle (1) comprises an inlet section (11), a middle section (12) and an outlet section (13); one end of the inlet section (11) is communicated with the backwater self-priming pipe (3), one end of the outlet section (13) is communicated with a gas-liquid outlet of the middle section (12), and the other end of the outlet section (13) is communicated with an inlet of the vortex pump (2); the other end of the inlet section (11) penetrates through the liquid inlet of the middle section (12), and the other end of the inlet section (11) is inserted into one end of the outlet section (13); a gas inlet (121) is arranged on the middle section (12), and a plurality of self-rotating air inlets (131) are circumferentially arranged at one end of the outlet section (13); the self-rotating air inlet hole (131) is opposite to the gas inlet (121).
3. The combined micro-nano bubble generator of claim 2, wherein the combined micro-nano bubble generator is characterized in thatThe inlet section (11) comprises an inlet (111), an outlet and an inlet tapered structure (112), the inlet (111) is connected with the backwater self-priming pipe (3), the inlet tapered structure (112) is arranged between the inlet (111) and the outlet, and the tapered ratio D of the inlet tapered structure (112) is 1 /D 2 The value range is 1.5-2.5, wherein D 1 Is the diameter of the inlet (111), D 2 Is the outlet diameter.
4. The combined micro-nano bubble generator of claim 3, wherein the inlet tapered structure (112) has a length L 1 Diameter D of inlet (111) 1 The value range of the ratio of (A) to (B) is 1-2; a taper angle a of the inlet taper structure (112) 1 Taking the angle of 20-50 degrees.
5. The combined micro-nano bubble generator according to claim 2, wherein a spin gas-liquid mixing chamber (122) is disposed in the middle section (12), the spin gas-liquid mixing chamber (122) is communicated with the gas inlet (121), and one end of the outlet section (13) having a plurality of spin gas inlets (131) is located in the spin gas-liquid mixing chamber (122).
6. The combined micro-nano bubble generator according to claim 2, wherein the number of the spin air inlets (131) is 3 to 10, and the diameter of the spin air inlets (131) is 0.5 to 2.5mm.
7. The combined micro-nano bubble generator of claim 2, wherein an included angle α between the center line of the spinning air inlet hole (131) and the flow direction x 60 +/-15 degrees are taken, and the included angle alpha between the central line of the self-rotating air inlet hole (131) and the radial direction y Take 30 ° ± 15 °.
8. The combined micro-nano bubble generator according to claim 2, wherein the outlet section (13) is sequentially provided with an insertion section, a throat (134), an outlet divergent section (132) and an outlet section outlet (133) along a flow direction; a plurality of nuts are circumferentially arranged on the insertion sectionA rotary air inlet hole (131); diameter D of the throat (134) 3 And the diameter D of the outlet (133) of the outlet section 4 The value range of the ratio is 0.2-0.8.
9. The combined micro-nano bubble generator of claim 8, wherein the length L of the throat is L 2 The ratio of the diameter of the throat pipe (134) to the diameter of the throat pipe is 1-1.8; the length L of the outlet diverging section (132) 3 The ratio of the diameter of the throat pipe (134) to the diameter of the throat pipe (134) is 3-6, and the divergent angle alpha of the outlet divergent section (132) 2 Is 8-15 degrees.
10. The combined micro-nano bubble generator according to claim 1, wherein the vortex pump (2) is a semi-open vortex pump, and the vane (23 a) of the semi-open vortex pump is in a V shape; the gas-liquid ratio of the outlet of the self-rotating gas-liquid mixing nozzle (1) is 5-15%.
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