CN107899441B

CN107899441B - Microbubble generating device

Info

Publication number: CN107899441B
Application number: CN201711403631.8A
Authority: CN
Inventors: 王少平; 王哲; 王会才; 陶凝
Original assignee: Summit Eco Ningbo Technologies Co ltd
Current assignee: Summit Eco Ningbo Technologies Co ltd
Priority date: 2017-12-22
Filing date: 2017-12-22
Publication date: 2024-05-07
Anticipated expiration: 2037-12-22
Also published as: CN107899441A

Abstract

The invention discloses a microbubble generating device, which comprises an accelerating rotational flow premixing mechanism, wherein the accelerating rotational flow premixing mechanism comprises a premixing chamber, the premixing chamber is used for accelerating mixing and turbulent flow shearing of inflowing gas-liquid mixed fluid, and the premixing chamber is a spiral volute type cavity; a bubble ejection mechanism; the steering swirl mixing mechanism comprises a steering chamber communicated with the premixing chamber, and is used for performing radial flow and axial flow steering rotation mixing and turbulent flow shearing on fluid from the premixing chamber, and the steering chamber is provided with double outlets; the diffusion cyclone mixing mechanisms are at least provided with two diffusion chambers which are respectively arranged at two sides of the steering cyclone mixing mechanism, and each diffusion cyclone mixing mechanism comprises a diffusion chamber which is communicated with one of outlets of the steering chamber and is used for carrying out axial-flow type rotary diffusion impact mixing and turbulent shearing on fluid from the steering chamber; the bubble ejecting mechanism is provided with two bubble ejecting mechanisms, and each bubble ejecting mechanism is communicated with the corresponding diffusion chamber.

Description

Microbubble generating device

Technical Field

The invention relates to the technical field of bubble generation devices, in particular to a device suitable for stably and efficiently manufacturing a large number of micro bubbles such as micro bubbles and nano bubbles.

Background

In recent years, in view of unique physicochemical characteristics of fine bubbles (micro-, and nano-bubbles having a bubble diameter of 10nm to 50 μm), that is, a system including a plurality of fine bubbles in a liquid has a much larger bubble surface area and a longest residence time of fine bubbles in water or the like as compared with a system including a single bubble having the same volume, gas dissolution characteristics of fine bubbles, adsorption characteristics of fine bubbles to impurities in a liquid, and the like are improved, and a substance transporting effect can be improved. Gas-liquid mixed fluids containing micro-bubbles are gaining more attention and importance in many fields including industrial and domestic sewage treatment, river and lake water body remediation, drinking water purification, aquaculture, agricultural plant cultivation and soil remediation, health medical appliances, and the like.

There are various technologies for producing and supplying bubbles by dissolving a gas (e.g., air, oxygen, ozone, carbon dioxide, hydrogen, etc.) in a liquid (e.g., water, sewage, seawater, ethanol, beverage, etc.), and the technologies mainly include the following: 1. a pressurizing and decompressing type dissolved air releasing method, such as a micro-bubble device disclosed in China patent application number 201510493652.8, comprising a dissolved air tank, wherein a tap which can rotate up and down relative to the dissolved air tank through a main shaft is arranged on the dissolved air tank, and a bubbler is arranged at a water outlet of the tap; see also the chinese patent publication number 201510493679.7 for a rotary microbubble machine; 2. a venturi cavitation method, as disclosed in chinese patent application No. 201180003953.8, which is installed between a pressure liquid supply member and a discharge member that discharges a liquid supplied from the pressure liquid supply member, and generates very small bubbles in the liquid discharged from the discharge member, is composed of an upstream side main body, a flow dividing valve, and a downstream side main body, the upstream side main body is provided with a first flow path narrowed toward a downstream side, the flow dividing valve is housed in the first flow path to provide a plurality of liquid passing holes, the downstream side main body is installed on the upstream side main body, a second flow path widened toward the downstream side is provided, and a downstream side end portion of the first flow path is opposed to an upstream side end portion of the second flow path; 3. a swirl type mixing shear as disclosed in chinese patent application No. 01810497.5, the micro-bubble generator comprising a container having a hollow portion formed in such a manner as to substantially maintain rotational symmetry, a gas-liquid introduction hole opening in a tangential direction to a peripheral wall portion of the container, and a gas-liquid injection hole provided in such a manner as to open in a direction along a rotational symmetry axis of the hollow portion; see also chinese patent publication 201180033648.3 for a microbubble generating device; 4. the spraying type mixed shearing, as disclosed in China patent with the application number 200510028381.5, is provided with a cam connected with a movable framework, a gas distribution chamber is arranged in the movable framework, the top of the gas distribution chamber and the top of the movable framework are respectively provided with a porous plate, the gas distribution chamber is connected with the movable framework through a jacking spring, when in use, air enters the gas distribution chamber through an air inlet, the gas distribution chamber and the framework are respectively provided with a porous plate, the two porous plates are overlapped, and when one porous plate continuously covers and opens micropores in a frequent micro-displacement mode, high-speed shearing is carried out on air flow, so that bubbles tend to be small and are rapidly separated from the surface of the porous plate; see also chinese patent publication 200710028073.1 for a method and apparatus for forming fine bubbles in a liquid. Or various combinations of the above basic techniques may be used.

In the technique of producing and supplying bubbles, in order to dissolve a large amount of gas in a liquid as much as possible, it is necessary to put the gas in a bubble state, and the smaller the diameter of the bubble is, the better the contact area and contact time of the gas with the liquid are to be maximized. However, it is difficult to efficiently produce a large amount of nano-sized microbubbles as required by the conventional microbubble generating apparatus, and it is difficult to satisfy the double requirements of the number of bubbles (high air content) and the bubble size (nano-sized) in many cases.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a microbubble generating device which can generate multi-scale bubble cracking so as to generate a large number of needed micro-nano bubbles.

The technical scheme adopted for solving the technical problems is as follows: a microbubble generating device comprises a bubble ejection mechanism;

The method is characterized in that: and also comprises

The accelerating rotational flow premixing mechanism comprises a premixing chamber, wherein the premixing chamber is used for accelerating mixing and turbulent shearing of inflowing gas-liquid mixed fluid and is a spiral volute type cavity;

The turning swirl mixing mechanism comprises a turning chamber communicated with the premixing chamber, and is used for turning rotary mixing and turbulent shearing of radial flow and axial flow of the fluid from the premixing chamber, and the turning chamber is provided with double outlets;

The diffusion cyclone mixing mechanisms are at least provided with two diffusion chambers which are respectively arranged at two sides of the steering cyclone mixing mechanism, and each diffusion cyclone mixing mechanism comprises a diffusion chamber communicated with one of the outlets of the steering chamber and is used for carrying out axial-flow type rotary diffusion impact mixing and turbulent shearing on fluid from the steering chamber;

The number of the bubble spraying mechanisms is two, and each bubble spraying mechanism is communicated with the corresponding diffusion chamber.

Preferably, the turning chamber has a radial inlet in communication with the accelerating swirl premixing mechanism, a first axial outlet and a second axial outlet disposed opposite and in communication with the diffusion swirl mixing mechanism on respective sides.

Preferably, the steering chamber comprises two spatial curved surfaces: a first curved surface forming the first axial outlet and having a flare shape smoothly transitioning from a radial direction to an axial direction, and a second curved surface forming the second axial outlet and having a flare shape smoothly transitioning from a radial direction to an axial direction.

In order to further strengthen the accelerated rotation strong turbulence shearing of the gas-liquid two-phase fluid of the incoming flow, at least two guide vanes for radial flow axial flow steering are arranged between the first curved surface and the second curved surface of the steering chamber.

In order to have a better diffusion effect, each diffusion chamber is provided with an axial inlet and a third axial outlet, any axial cross section of the diffusion chamber is circular, the axial cross section of the diffusion chamber is provided with continuous or discontinuous gradual expansion along the direction of the third axial outlet near the axial inlet, and the axial cross section of the diffusion chamber is provided with continuous or discontinuous gradual contraction along the axial direction near the third axial outlet until the third axial outlet; the cross section of the axial inlet is circular, the two axial inlets are respectively connected with a first axial outlet and a second axial outlet of the steering rotational flow mixing mechanism, the cross section area of each axial inlet is larger than or equal to that of the corresponding first axial outlet or second axial outlet, and the third axial outlet is communicated with the bubble spraying mechanism.

In order to further strengthen the strong turbulent flow shearing of the gas part of the gas-liquid two-phase fluid, at least two diffusion vortex mixing mechanisms are arranged between the steering vortex mixing mechanism and the bubble spraying mechanisms on each side, the first diffusion vortex mixing mechanism on each side of the steering vortex mixing mechanism is communicated with the steering vortex mixing mechanism, the last diffusion vortex mixing mechanism is communicated with the corresponding bubble spraying mechanism, and the second axial outlet of the former diffusion vortex mixing mechanism is connected with the axial inlet of the next adjacent diffusion vortex mixing mechanism.

Preferably, in order to fully contact and mix the gas and the liquid, the outer edge of the axial cross section of the premixing chamber is in an involute spiral shape or an approximately gradual-open spiral shape, and the flow direction cross section of the premixing chamber is in a trapezoid shape, a round shape, a pear shape or a rectangle shape which gradually contracts along the flow direction.

Preferably, the premixing chamber is provided with an incoming flow inlet and a radial outlet, the outer edge of the incoming flow inlet is connected with the outer edge tangent of the axial cross section, and the radial outlet is communicated with the steering rotational flow mixing mechanism.

In order to be suitable for different supply systems, an air inlet mechanism for supplying air is arranged near an inflow inlet of the premixing chamber, so that primary air filling or secondary air filling can be performed.

Preferably, the bubble spraying mechanism is a throttling type nozzle, the bubble spraying mechanism is provided with a nozzle outlet, and one or more outlet orifices are formed in the cross section of the nozzle outlet.

Compared with the prior art, the invention has the advantages that: the gas part of the inflow gas-liquid mixed fluid is subjected to multistage multi-scale strong-swirl turbulent flow shearing and mixing between gas and liquid phases in a multistage multi-scale manner, so that multistage multi-scale bubble fracturing is generated, and a large number of needed micro-nano bubbles are generated; the steering rotational flow mixing mechanism is provided with the double outlets, so that micro-nano bubbles can be generated at both sides of the accelerating rotational flow premixing mechanism at the same time, and the requirement of a large number of bubbles is further met; the dual requirements of high air content and micro-bubble size of the gas-liquid mixed fluid can be simultaneously met, and the device has the characteristics of compact structure, high efficiency and energy conservation.

Drawings

FIG. 1 is a radial cross-sectional view of a first embodiment of a microbubble generation device of the present invention;

FIG. 2 is an axial cross-sectional view of a first embodiment of the microbubble generation device of the present invention;

FIG. 3 is a schematic diagram of an accelerating swirl premix mechanism of the microbubble generation device of FIG. 1;

FIG. 4 is a schematic cross-sectional view of an incoming flow inlet of an accelerating swirl premix mechanism of the microbubble generation device of FIG. 1;

FIG. 5 is a schematic flow cross-sectional view of the accelerating swirl premixing mechanism of FIG. 3;

fig. 6 is a radial sectional view of a second embodiment of the microbubble generation device of the present invention.

Detailed Description

The invention is described in further detail below with reference to the embodiments of the drawings.

Example 1

Referring to fig. 1 and 2, the microbubble generating device has a multi-stage multi-scale gas-liquid two-phase interphase strong turbulence shearing function, can enable gas in a gas-liquid mixed fluid to generate multi-stage multi-scale bubble cracking, and is suitable for efficiently generating a large number of required micro-nano bubbles. The fluid medium is a gas-liquid two-phase mixed fluid, wherein common dissolved gases are, but not limited to, air, oxygen, ozone, carbon dioxide, hydrogen and the like, and common dissolved liquids are, but not limited to, water, sewage, seawater, ethanol, beverages and the like.

The microbubble generating device of the present embodiment includes an acceleration swirling premix mechanism 1, a turning swirling mixing mechanism 2, a diffusion swirling mixing mechanism 3, and a bubble ejection mechanism 4. Hereinafter, it is not specifically stated that "axial" is the axial or parallel direction of the premix chamber and "radial" is the radial or parallel direction of the premix chamber.

Referring to fig. 3-5, the accelerating swirl premixing mechanism 1 is used for performing spiral rotation accelerating mixing on inflowing gas-liquid mixed fluid, and comprises a premixing chamber 11, a spiral volute type cavity, wherein the premixing chamber 11 is provided with an inflow inlet 111, a radial outlet 112 and a volute tongue 113. The inflow inlet 111 is for connection to an external supply system to receive a mixed fluid composed of gas and liquid from the supply system. The inflow inlet 111 has a circular, trapezoidal or rectangular cross section. The premixing chamber 11 is used for performing spiral rotation acceleration mixing and turbulent shearing on the gas-liquid mixed fluid flowing in through the inflow inlet 111, the outer edge 114 of the axial cross section of the premixing chamber 11 is of an involute spiral type or an approximately involute spiral type, and the flow direction cross section 115 (each section is marked as III, IV, V, VI, VII, VIII, IX, X, XI, XII) of the premixing chamber 11 is of a trapezoid, a circle, a pear shape or a rectangle which gradually contracts along the flow direction. The outer edge 1111 of the inflow inlet 111 is tangentially connected to the axial cross-section outer edge 114. The radial outlet 112 is a radial outlet, and is an annular band-shaped opening for communicating with the steering rotational flow mixing mechanism 2.

Alternatively, the fluid from the supply system may be a single phase liquid. Whether the incoming flow is a single-phase or a two-phase mixed fluid, an air inlet mechanism 12 for supplying air is arranged near an incoming flow inlet 111 of the premixing chamber 11 for primary air filling or secondary air filling.

The turning rotational flow mixing mechanism 2 is a double-outlet mechanism and is used for carrying out radial flow axial flow turning on fluid, and comprises a turning cavity 21 which is used for carrying out further turning rotational mixing and turbulent flow shearing on high-speed rotational gas-liquid mixed fluid flowing in by the accelerating rotational flow premixing mechanism 1, and meanwhile, the rotational turning from radial flow to axial flow of the high-speed rotational gas-liquid mixed fluid is realized. The turning chamber 21 has a radial inlet 211, a first axial outlet 212 and a second axial outlet 213, the turning chamber 21 comprising two spatial curved surfaces: a first curved surface 214 having a flare smoothly transitioning from the radial direction to the axial direction, which constitutes the first axial outlet 212, and a second curved surface 215 having a flare smoothly transitioning from the radial direction to the axial direction, which constitutes the second axial outlet 213. The two axial outlets are respectively arranged oppositely. The radial inlet 211 is also an annular band-shaped opening and is connected to the radial outlet 112 of the accelerating swirl premix mechanism 1 for receiving the mixed fluid from the accelerating swirl premix mechanism 1. The first axial outlet 212 and the second axial outlet 213 are circular in cross section and are used for communicating with the diffusion cyclone mixing mechanism 3. The centerline of the incoming flow inlet 111 of the accelerating swirl premix mechanism 1 passes through the hub 216 of the turn-around chamber 21, the left side of the hub 216, or the right side of the hub 216.

The two diffusion cyclone mixing mechanisms 3 are respectively arranged at two sides of the steering cyclone mixing mechanism 2 and are used for performing axial flow expansion diffusion on fluid, each diffusion cyclone mixing mechanism 3 comprises a diffusion chamber 31 which is cylindrical, and the diffusion chamber 31 is provided with an axial inlet 311 and a third axial outlet 312. Any axial cross-section of the diffusion chamber 31 is circular, the axial cross-section of the diffusion chamber 31 has a continuous or discontinuous progressive expansion in the direction of the third axial outlet 312 near the axial inlet 311, and the axial cross-section of the diffusion chamber 31 has a continuous or discontinuous progressive contraction in the axial direction near the third axial outlet 312 up to the third axial outlet 312.

The diffusion chamber 31 having such a structure can perform axial-flow type rotation diffusion, deceleration, impact mixing and turbulent shearing on the high-speed rotation fluid from the turning chamber 21, and can achieve the purpose of generating bubbles by producing strong turbulent shearing between the gas phase and the liquid phase. Due to the change in the cross-sectional area of the flow passage, the speed of the axially rotating incoming flow will suddenly decrease and the pressure will significantly increase after entering the diffusion chamber 31; meanwhile, due to the relatively large space and relatively small outlet cross-sectional area of the diffusion chamber 31, the flow velocity in the cross-section of the third axial outlet 312 is high, but in the latter half of the diffusion chamber 31 near the third axial outlet 312, the outlet is small, the resistance is large, a retarding and accumulating effect is generated on the front incoming flow, the high-speed rotating incoming flow from the steering chamber 21 will generate a rotating impact on the fluid accumulating in the latter half of the diffusion chamber 31 at a relatively low speed, the speed will be significantly reduced, a strong rotating impact mixing effect and a strong turbulent shearing between the gas phase and the liquid phase will be generated, and a large number of bubbles are burst, and the sudden rise of the pressure will accelerate and strengthen the bubble burst process.

The cross section of the axial inlet 311 is circular, and the two axial inlets 311 of the two diffusion cyclone mixing mechanisms 3 are respectively connected with the first axial outlet 212 and the second axial outlet 213 of the steering cyclone mixing mechanism 2, and the cross section area of each axial inlet 311 is larger than or equal to the cross section area of the corresponding first axial outlet 212 or second axial outlet 213. The third axial outlet 312 is circular in cross section for communication with the bubble-ejecting mechanism 4.

The bubble jet mechanism 4 has two, and communicates with each of the diffusion swirl mixing mechanisms 3. In the present embodiment, the bubble jet mechanism 4 is a throttle type nozzle, preferably a laval type, venturi type or straight tube type nozzle, and the bubble jet mechanism 4 has a nozzle outlet 41, and one or more outlet orifices are provided in the cross section of the nozzle outlet 41.

In order to further enhance the strong turbulent shearing of the gas portion of the gas-liquid two-phase fluid, more than one diffusion cyclone mixing mechanism 3 may be disposed between the diversion cyclone mixing mechanism 2 and the bubble spraying mechanism 4 on each side, and the third axial outlet 312 of the former diffusion cyclone mixing mechanism 3 is connected with the axial inlet 311 of the next adjacent diffusion cyclone mixing mechanism 3.

The microbubble generating device sequentially carries out spiral rotation acceleration mixing, centripetal radial flow axial flow diversion rotation acceleration mixing, axial flow expansion diffusion rotation impact mixing, throttling jet flow mixing and other multistage multi-scale strong rotational flow turbulence shearing and mixing on the inflowing gas-liquid mixed fluid. In the whole process, the huge physical property difference between the two phases of gas and liquid is utilized: the density difference and the viscosity difference are physical processes such as sudden acceleration, spiral rotation, steering rotation and rotation impact are adopted for the two-phase fluid, sudden deceleration (the sudden deceleration is the same as the sudden acceleration and is used for manufacturing strong turbulence shearing between the gas phase and the liquid phase so as to achieve the purpose of generating bubbles), sudden pressurization, throttling acceleration and depressurization of an outlet and the like are adopted for manufacturing speed difference and strong turbulence shearing between the gas phase and the liquid phase, and then the multi-stage and multi-scale rupture of the bubbles is caused, so that a large number of needed micro-nano bubbles are manufactured.

Example two

Referring to fig. 6, in this embodiment, a first difference from the above embodiment is that at least two guide vanes 22 for radial flow axial flow steering are further disposed between the first curved surface 214 and the second curved surface 215 of the steering chamber 21 of the steering rotational flow mixing mechanism 2, so that the accelerated rotation and strong turbulent flow shearing of the incoming gas-liquid two-phase fluid can be further enhanced.

Preferably, the guide vanes 22 are arranged at uniform intervals in the circumferential direction.

Claims

1. A microbubble generating device includes a bubble ejection mechanism (4);

The method is characterized in that: and also comprises

The accelerating cyclone premixing mechanism (1), the accelerating cyclone premixing mechanism (1) comprises a premixing chamber (11) for accelerating mixing and turbulent shearing of inflowing gas-liquid mixed fluid, and the premixing chamber (11) is a spiral volute type cavity; the outer edge (114) of the axial cross section of the premixing chamber (11) is of an involute spiral type, and the flow direction cross section (115) of the premixing chamber (11) is of a trapezoid, a circle, a pear shape or a rectangle which gradually contracts along the flow direction; the premixing chamber (11) is provided with an inflow inlet (111) and a radial outlet (112), the outer edge (1111) of the inflow inlet (111) is tangentially connected with the outer edge (114) of the axial cross section, and the radial outlet (112) is communicated with the steering rotational flow mixing mechanism (2);

a turning swirl mixing mechanism (2) comprising a turning chamber (21) in communication with the premixing chamber (11) for turning rotational mixing and turbulent shearing of centripetal radial axial flow of fluid from the premixing chamber (11), the turning chamber (21) having a double outlet; the steering chamber (21) is provided with a radial inlet (211), a first axial outlet (212) and a second axial outlet (213), the radial inlet (211) is communicated with the accelerating cyclone premixing mechanism (1), and the first axial outlet (212) and the second axial outlet (213) are oppositely arranged and respectively communicated with the diffusion cyclone mixing mechanisms (3) at the corresponding sides; the steering chamber (21) comprises two spatially curved surfaces: -a first curved surface (214) with a smooth transition from radial to axial, constituting the first axial outlet (212), and-a second curved surface (215) with a smooth transition from radial to axial, constituting the second axial outlet (213);

The diffusion cyclone mixing mechanisms (3) are at least provided with two diffusion chambers (31) which are respectively arranged at two sides of the steering cyclone mixing mechanism (2), and each diffusion cyclone mixing mechanism (3) comprises a diffusion chamber (31) communicated with one outlet of the steering chamber (21) and is used for carrying out axial-flow type rotary diffusion impact mixing and turbulent shearing on fluid from the steering chamber (21); each diffusion chamber (31) has an axial inlet (311) and a third axial outlet (312), any axial cross section of the diffusion chamber (31) is circular, the axial cross section of the diffusion chamber (31) has continuous or discontinuous progressive expansion along the third axial outlet (312) near the axial inlet (311), and the axial cross section of the diffusion chamber (31) has continuous or discontinuous progressive contraction along the axial direction near the third axial outlet (312) until the third axial outlet (312); the cross section of the axial inlet (311) is circular, the two axial inlets (311) are respectively connected with a first axial outlet (212) and a second axial outlet (213) of the steering rotational flow mixing mechanism (2), and the cross section of each axial inlet (311) is larger than or equal to the cross section of the corresponding first axial outlet (212) or second axial outlet (213);

the bubble ejecting mechanism (4) has two, and each bubble ejecting mechanism (4) is communicated with a third axial outlet (312) of the corresponding diffusion chamber (31).

2. The microbubble generation device according to claim 1, wherein: at least two guide vanes (22) for radial flow axial flow steering are arranged between the first curved surface (214) and the second curved surface (215) of the steering chamber (21).

3. The microbubble generation device according to claim 1, wherein: the device is characterized in that the number of the diffusion vortex mixing mechanisms (3) between the steering vortex mixing mechanism (2) and the bubble spraying mechanisms (4) on each side is at least two, the first diffusion vortex mixing mechanism (3) on each side of the steering vortex mixing mechanism (2) is communicated with the steering vortex mixing mechanism (2), the last diffusion vortex mixing mechanism (3) is communicated with the corresponding bubble spraying mechanism (4), and the third axial outlet (312) of the former diffusion vortex mixing mechanism (3) is connected with the axial inlet (311) of the next adjacent diffusion vortex mixing mechanism (3).

4. The microbubble generation device according to claim 1, wherein: an air inlet mechanism (12) for supplying air is arranged near an inflow inlet (111) of the premixing chamber (11).

5. The microbubble generation device according to any one of claims 1 to 4, wherein: the bubble spraying mechanism (4) is a throttling type nozzle, the bubble spraying mechanism (4) is provided with a nozzle outlet (41), and one or more outlet orifices are formed in the cross section of the nozzle outlet (41).