Nanobubble generation system using friction

Abstract

The present invention relates to a nano bubble generation system using friction, characterized in that by eliminating a fixing part, friction force is effectively applied to bubbles contained in a gas-liquid mixed fluid, so that the bubbles are miniaturized and nano bubbles are generated; the nano bubble generation system using friction comprises: a main cavity, one or more impact members, a plurality of friction members and a driving device. The main cavity comprises an internal space required for miniaturizing bubbles contained in the gas-liquid mixed fluid, an inlet and an outlet, and is provided with a driving shaft; the one or more impact members are arranged on the driving shaft, and have a plurality of protrusions to impact the gas-liquid mixed fluid flowing into the main cavity while causing the fluid to rotate and rub against the inner wall of the main cavity; the plurality of friction members are arranged on the driving shaft to increase the friction force on the gas-liquid mixed fluid; the driving device comprises the driving shaft, and drives the impact members and the friction members to rotate; the friction members are arranged on the driving shaft at any spacing, and the peripheral surface of the friction members is directly facing the inner wall of the main cavity at any distance.

Description

[Technical field]

[0002] The present invention relates to a nano bubble generation system using friction, which effectively applies friction force to bubbles contained in a gas-liquid mixed fluid by eliminating a fixing part, so as to refine the bubbles into smaller bubbles and further generate nano bubbles.

[0003] [Prior Art]

[0004] In general, tiny bubbles can be divided into microbubbles with a diameter of less than 50㎛ and nanobubbles with a diameter of less than several hundred㎚ according to their size.

[0005] Microbubbles are very small bubbles of less than 50㎛. They float to the surface of the water at a very slow speed of 0.1cm / sec and disappear within 2 to 3 minutes, leaving a hazy milky white color in the water.

[0006] Nanobubbles are microbubbles that are further miniaturized to a size of several hundred mm or less. They have different characteristics from ordinary bubbles and microbubbles in many aspects. Nanobubbles are transparent, so even if they exist in water, they cannot be seen with the naked eye under normal circumstances.

[0007] As mentioned above, microbubbles form a stable state in the liquid for a short time and then disappear. On the contrary, nanobubbles are surrounded by concentrated ions and can be maintained stably for a long time for more than dozens of days.

[0008] These nanobubbles generate a variety of energies when they disappear, and are therefore used in a variety of aquaculture and soilless cultivation in the fishery and agricultural fields, precision diagnosis and physical therapy in the medical field, and high-purity purification, sterilization, disinfection, deodorization, and cleaning of wastewater and waste oil in the living field.

[0009] For example, when treating water, effectively injecting air into the water can improve water quality and reduce treatment time; when treating wastewater or waste oil, effectively injecting highly oxidizing gases such as ozone can decompose or remove various odorous substances contained in the wastewater or waste oil.

[0010] In order to refine the bubbles, most traditional technologies are based on the principle of splitting the bubbles by shearing the flowing gas-liquid mixed fluid, which has the composition of boundary layer effect, fluid turbulence and cavitation. These technologies mainly produce microbubbles, while the amount of nanofoam produced is extremely small and cannot reach the level of actual use.

[0011] One of the prior art, the structure of the Republic of Korea registered patent No. 10-1969772 (announcement date 2019. 04. 17, hereinafter referred to as "prior art 1") can be summarized as follows: at the inlet and outlet of the mixing section body, flow channel guide vanes are set to guide the flow direction of the fluid. In the housing, with the motor shaft as the center, there is a multi-layer structure consisting of a rotating part and a fixed part stacked continuously. According to the relative rotation of the rotating part to the fixed part, the fixed part and the rotating part respectively form corresponding gears to repeatedly impact the fluid, increase the turbulence and cavitation pressure of the fluid, make the bubbles produce shear force, and generate microbubbles.

[0012] Most of the bubbles generated by the prior art 1 using the above structure are microbubbles. Therefore, the refinement quality is poor and the existence time is short. The flow of the fluid is forced to bypass the structure in a zigzag shape through the stacked gaps, resulting in problems such as a large flow resistance coefficient, high power consumption, insufficient processing flow, and low production efficiency.

[0013] In addition, since high pressure needs to be maintained in the cavity and complex rotating and fixed parts need to be set up, a large amount of electricity is consumed to drive it, which increases the operating cost burden.

[0014] Different from the above-mentioned prior art 1, the structure of Japanese Patent Gazette No. 2009-142442 (publication date 2009.7.2, hereinafter referred to as "prior art 2") is: a shearing portion is set on the rotating shaft in the main cavity to form a rotating disk, which is composed of a plurality of rotating disks arranged.

[0015] The above-mentioned prior art 2 uses a rotating disk that rotates independently instead of rotating relative to each other, thereby achieving free flow, increasing the discharge volume of the fluid, and having the advantages of significantly reducing power consumption and operating costs. However, since the rotating disk is composed of a rotating disk with shearing force as the main function, it has the disadvantage of only generating microbubbles and low bubble generation efficiency.

[0016] As mentioned above, the current micro-bubble generation technology has only been limited to micro-bubble generation, and although nano-bubbles are excellent in practicality, they cannot be actually used in the industrial field. Summary of the invention

[0017]

Issues to be resolved

[0018] In view of the above problems, the first object of the present invention is to provide a nanobubble generating system using friction, which increases friction on bubbles contained in a gas-liquid mixed fluid by removing a fixing member, and refines the bubbles into smaller bubbles, thereby generating nanobubbles.

[0019] The second object of the present invention is to provide a nanobubble generating system using friction, which generates nanobubbles by first miniaturizing the bubbles contained in the gas-liquid mixed fluid into a microbubble stage and then further miniaturizing the bubbles through friction, thereby increasing the amount of nanobubbles generated.

[0020] The third object of the present invention is to provide a nanobubble generating system using friction, in which more effective friction surfaces are provided during the flow of the fluid to significantly improve the quality and amount of nanobubbles generated by friction.

[0021] Another object of the present invention is to provide a nanobubble generating system using friction, which generates nanobubbles of good quality and quantity, so as to be easily applied in industrial fields requiring large-volume and effective nanobubbles.

[0022]

Solution

[0023] The technical solution of the present invention to solve the above technical problems is as follows: A nano bubble generation system using friction mainly comprises: a main cavity, more than one impact member, a plurality of friction members and a driving device;

[0024] The main cavity includes an internal space required for miniaturizing bubbles contained in the gas-liquid mixed fluid, an inlet and an outlet, and is provided with a driving shaft;

[0025] The one or more impact members are arranged on the driving shaft, and the impact members have a plurality of protrusions so as to impact the gas-liquid mixed fluid flowing into the main cavity and make the fluid rotate and rub against the inner wall of the main cavity;

[0026] The plurality of friction members are disposed on the driving shaft to increase the friction force on the gas-liquid mixed fluid;

[0027] The driving device includes the driving shaft, which drives the impact member and the friction member to rotate.

[0028] The friction members are arranged on the driving shaft at random intervals, and the peripheral surfaces of the friction members are directly facing the inner wall of the main cavity at random distances.

[0029] In at least one of the plurality of friction materials, the rotation speed of the front end of the side surface perpendicular to the axis is set to 8 m / sec or more.

[0030] At least one of the one or more impact members and the plurality of friction members is provided with at least one of a distribution hole or a cut-out channel to guide the flow of the gas-liquid mixed fluid to a side surface perpendicular to the axis.

[0031] As a further solution of the embodiment of the present invention: a nano bubble generation system using friction mainly comprises: a main cavity, more than one impact member, a plurality of friction members and a driving device;

[0032] The main cavity includes an internal space required for miniaturizing bubbles contained in the gas-liquid mixed fluid, an inlet and an outlet, and is provided with a driving shaft;

[0033] The one or more impact members are arranged on the driving shaft, and the impact members have a plurality of protrusions so as to impact the gas-liquid mixed fluid flowing into the main cavity and make the fluid rotate and rub against the inner wall of the main cavity;

[0034] The plurality of friction members are disposed on the driving shaft to increase the friction force on the gas-liquid mixed fluid;

[0035] The driving device includes the driving shaft, which drives the impact member and the friction member to rotate.

[0036] The friction members are arranged on the driving shaft at random intervals, and the peripheral surfaces of the friction members are directly facing the inner wall of the main cavity at random distances;

[0037] The invention is characterized in that one or more small-diameter friction members and one or more large-diameter friction members with a relatively larger radius are arranged in an arbitrary spacing.

[0038] The driving shaft is sequentially arranged in the micron refinement interval and the nanometer refinement interval;

[0039] The micron refinement zone is composed of one or more impact members arranged to decompose the bubbles contained in the gas-liquid mixed fluid flowing into the main cavity into microbubble stages;

[0040] The nano-refining zone is arranged after the micro-refining zone according to the flow direction, and is composed of one or more friction members arranged to further refine the bubbles generated in the micro-refining stage into nano-bubbles;

[0041] The micron-refining zone includes an annular fixing member corresponding to the impact member and arranged on the inner wall of the main cavity;

[0042] The fixing member has a plurality of protrusions formed on the inner periphery of the annular inner wall.

[0043] As a further solution of the embodiment of the present invention: a nano bubble generating system using friction, comprising more than one micro bubble stage refinement device and a nano bubble generating device;

[0044] The one or more microbubble stage refinement devices apply impact and shear force to the gas-liquid mixed fluid to refine the bubbles into microbubble stages;

[0045] The nanobubble generating device applies friction force to the gas-liquid mixed fluid that has passed through the microbubble stage refinement device to refine the bubbles into nanobubbles;

[0046] The nano bubble generating device comprises a first main cavity, one or more friction members and a first driving device;

[0047] The first main cavity comprises an inner wall, an inlet and an outlet for the fluid; the inner wall can form a space for accommodating the gas-liquid mixed fluid and can also exert friction on the fluid;

[0048] The one or more friction members are arranged in the first main cavity and can be rotated by the driving shaft to generate centrifugal force to throw the fluid toward the inner wall. At the same time, the one or more friction members have a friction effect on the fluid.

[0049] The first driving device includes the driving shaft to realize the rotation of the friction member.

[0050] The microbubble stage refinement device comprises a second main chamber, one or more impact members or impellers and a second driving device;

[0051] The second main cavity includes an internal space required for miniaturizing bubbles contained in the gas-liquid mixed fluid, an inlet, an outlet, and is provided with a driving shaft;

[0052] The one or more impact members or impellers are provided on the drive shaft and have a plurality of protrusions to exert impact on the fluid;

[0053] The second driving device includes the driving shaft and can drive the impact member or the impeller.

[0054] At least one of the impact member and the friction member may be provided with a distribution hole or a cut-out channel to guide the flow of the gas-liquid mixed fluid to a plane perpendicular to the axis.

[0055] At least one of the friction members may be formed of an impeller-type friction member having a plurality of blades.

[0056] The driving shaft of the nano bubble generating device may be provided with more than one friction member and more than one impact member in the micro bubble stage refinement device.

[0057] One or more of the impact members of the microbubble stage refinement device has a plurality of the protrusions formed at least on its periphery.

[0058] A plurality of protrusions are formed directly or indirectly on a portion of the inner wall of the second main cavity.

[0059] The impeller is arranged on the driving shaft of the microbubble stage refinement device, and the inlet of the impeller is connected to the inlet of the main cavity through an inlet pipe.

[0060] A radial protrusion is provided on the inner wall of the second main cavity to form a pump-type micro-bubble stage refinement device;

[0061] A volute-type pipeline can be arranged between the impeller of the pump-type microbubble stage refinement device and the inner wall of the second main cavity to suck in the gas-liquid mixed fluid and guide it to the inner wall of the second main cavity.

[0062] As a further solution of the embodiment of the present invention, a nano bubble generation system using friction mainly comprises: a main cavity, one or more impact and friction parts and a driving device;

[0063] The main cavity includes an internal space, an inlet and an outlet required for miniaturizing bubbles contained in the gas-liquid mixed fluid, and is provided with the driving shaft;

[0064] The one or more impact and friction members are arranged on the drive shaft and have a plurality of protrusions and friction parts; the protrusions exert impact on the gas-liquid mixed fluid flowing into the main cavity, causing the fluid to rotate and rub against the inner wall of the main cavity; the friction parts can exert friction force on the fluid;

[0065] The driving device is capable of rotating the impact and friction member.

[0066] The one or more impact and friction members are arranged on the driving shaft at arbitrary intervals, and their peripheral surfaces are directly facing the inner wall of the main cavity at arbitrary intervals.

[0067] In at least one of the impact and friction parts, at least one of the distribution holes or the cut-out channels is provided to guide the flow of the gas-liquid mixed fluid to the side perpendicular to the axis.

[0068] [Effects of the invention]

[0069] The present invention relates to a nano bubble generating system using friction, which effectively applies friction force to bubbles contained in a gas-liquid mixed fluid by eliminating a fixing part, so as to refine the bubbles into smaller bubbles and further generate nano bubbles.

[0070] Moreover, the bubbles contained in the gas-liquid mixed fluid are first refined to the microbubble stage, and then nanobubbles are generated by using the principle of refining the bubbles by friction, which can significantly improve the efficiency of nanobubble generation.

[0071] Secondly, by the rotation speed of the friction part, the friction surface, the appropriate distance between the friction part and the inner wall of the main cavity, and especially by excluding the fixing part, not only the friction part but also the inner wall of the main cavity with a larger area can function as a friction surface; by setting distribution holes on the friction part, etc., its entire surface can function as an effective friction surface. Therefore, the bubble refinement quality, dissolved oxygen content and nano bubble generation capacity are significantly improved compared with the prior art, and a large volume of nano bubbles can be generated.

[0072] Furthermore, the generated nanobubbles are of good quality and quantity, and can be used more effectively and conveniently in all industrial fields that require large-capacity nanobubbles.

Brief Description of the Drawings

[0074] Figure 1 Schematic diagram of the principle of using friction to generate nanobubbles, (a) is a schematic diagram of the refinement of fluid (bubbles) through flow friction; (b) is a schematic diagram of the refinement of fluid (bubbles) through the rotational friction of the friction part.

[0075] Figure 2 It is a schematic longitudinal sectional view of the structure of an embodiment of the present invention.

[0076] Figure 3 yes Figure 2 Schematic diagram of fluid flow, (a) is Figure 2 A partial enlarged view of part A, (b) is Figure 3 (a) Cross-section along line BB.

[0077] Figure 4 It is a schematic longitudinal sectional view of the structure of an embodiment of the present invention.

[0078] Figure 5 (a) is a schematic diagram of the structure of an embodiment of the present invention and a partially omitted cross-sectional view, (b) is Figure 5 (a) is a partially omitted cross-sectional view along line CC.

[0079] Figure 6 It is a simplified schematic diagram of the arrangement structure of an embodiment of the present invention.

[0080] Figure 7 (a) is a longitudinal sectional view of a nano bubble generating device according to an embodiment of the present invention, (b) is a sectional view taken along line DD in (a), and (c) is a sectional view of another form different from (b).

[0081] Figure 8 4 is a longitudinal sectional view of a nano bubble generating device according to an embodiment of the present invention.

[0082] Fig. 9(a) is a longitudinal sectional view of a microbubble stage refinement device according to an embodiment of the present invention, and (b) is a partially omitted sectional view of line EE in (a).

[0083] Fig.10 (a) is a partially omitted plan view of a friction member according to an embodiment of the present invention, and (b) is a longitudinal section of (a).

[0084] Fig.11 (a) is a plan view of a friction member according to an embodiment of the present invention, and (b) is a longitudinal sectional view of (a).

[0085] Fig.12 (a), (b), and (c) are plan views of the friction member according to an embodiment of the present invention.

[0086] Fig.13 (a) is a partially omitted plan view of a friction member according to an embodiment of the present invention, and (b) is a longitudinal sectional view of (a).

[0087] Fig.14 (a) is a partially omitted plan view of the multiple friction member of an embodiment of the present invention, and (b) is a longitudinal sectional view of (a).

[0088] Fig.15 (a) is a partially omitted plan view of an impeller-type friction member according to an embodiment of the present invention, (b) is a longitudinal sectional view of (a), and (c) is a longitudinal sectional view of another embodiment of (b).

[0089] Fig.16 (a) is a plan view of an impact piece according to an embodiment of the present invention, (b) is a longitudinal sectional view of (a), and (c) is a plan view of another embodiment of (a).

[0090] Fig.17 (a) is a partially omitted plan view of an impact member according to an embodiment of the present invention, and (b) is a longitudinal sectional view of (a).

[0091] Fig.18 (a) is a partially omitted plan view of an impact member according to an embodiment of the present invention, and (b) is a longitudinal sectional view of (a).

[0092] Fig.19 (a) is a longitudinal sectional view of a microbubble stage refinement device according to an embodiment of the present invention, and (b) is a partially omitted sectional view of line FF in (a).

[0093] Fig. 20 (a) is a longitudinal sectional view of a microbubble stage refinement device according to an embodiment of the present invention, and (b) is a longitudinal sectional view of (a).

[0094] The cross-sectional view of line GG is partially omitted.

[0095] Fig.21(a) is a longitudinal sectional view of a microbubble stage refinement device according to an embodiment of the present invention, and (b) is a longitudinal sectional view of (a).

[0096] Cross-section of line HH.

[0097] Fig. 22 (a) is a longitudinal sectional view of a microbubble stage refinement device according to an embodiment of the present invention, and (b) is a longitudinal sectional view of (a).

[0098] Cross-section of the JJ line.

[0099] Fig.23 It is a schematic longitudinal sectional view of the structure of an embodiment of the present invention.

[0100] Fig.24 (a) is Fig.23 (b) is an enlarged view of the K part of (a), and (b) is a cross-sectional view of the LL line in (a). [Specific implementation method]

[0102] Next, an embodiment of a nano bubble generating system utilizing friction of the present invention is described in detail with reference to the accompanying drawings.

[0103] All objects will generate heat when they are subjected to pressure accompanied by speed. When the speed and pressure reach a critical point, small cracks will appear on the friction surface accompanied by heat to reduce friction.

[0104] This phenomenon can also be easily seen on the ice surface, where the ice blades of the skates pass through and heat, ice melts, and the surface becomes slippery.

[0105] For example, when friction is applied to a gas-liquid mixed fluid of water and oxygen, the bubbles contained in the fluid, such as Figure 1 As shown in (a), stretching deformation will occur and the bubble will split into small bubbles. Each small bubble will be further refined and repeatedly refined to nanometer size (hereinafter referred to as "the principle of bubble refinement through friction").

[0106] The applicant of this case has previously disclosed a "flow channel pipe for fine bubble generation" utilizing this "bubble miniaturization principle through friction" (Korean Patent Registration No. 10-2100074, hereinafter referred to as "prior patent technology").

[0107] The above-mentioned patented technology is a technology that forms a detailed friction surface in a tubular flow channel pipe. When the friction length reaches several meters to tens of meters, nanobubbles can be generated. On the friction surface in a static state, the gas-liquid mixed fluid flows at a pressure and speed above the critical pressure, thereby generating friction to generate nanobubbles.

[0108] However, although the above-mentioned prior patent technology can generate small and medium-sized nanobubbles, if large-capacity nanobubbles need to be generated, an ordinary pump cannot be used, but a large-capacity pressure pump is required, and it is difficult to form a dense friction surface for the correspondingly increased tube diameter.

[0109] In order to solve the above problems, the applicant used the reverse thinking of the prior patent technology and focused on the method of applying friction to the fluid by making the friction surface move at high speed when the fluid is in a static state.

[0110] In terms of generating nanobubbles, even if the gas-liquid mixed fluid is not refined to the micron bubble stage, as long as fine bubbles are generated, it is also Figure 1 As shown in (b), if a rotational friction force is forcibly applied, the bubbles contained in the gas-liquid mixed fluid will be stretched and deformed in a circular arc shape according to the rotating friction surface, and will be decomposed into an extremely fine state.

[0111] The present invention applies the above-mentioned bubble miniaturization principle and nano bubble generation principle through friction, plus a rotational friction force.

[0112] The first embodiment of the present invention is a nano bubble generating system (1A) using friction, such as Figure 2 and Figure 3 As shown, it mainly comprises a main cavity (30), one or more impact members (20), a plurality of friction members (10) and a driving device (40).

[0113] The main cavity (30) comprises an internal space (S) required for miniaturizing bubbles contained in the gas-liquid mixed fluid, an inlet (31) and an outlet (32), and is provided with a driving shaft (41).

[0114] The one or more impact members (20) are arranged on the driving shaft (41), and the impact members have a plurality of protrusions (21) so as to impact the gas-liquid mixed fluid flowing into the main cavity and rotate the fluid so that the fluid rubs against the inner wall (33) of the main cavity.

[0115] The plurality of friction members (10) are arranged on the driving shaft (41) to increase the friction force on the gas-liquid mixed fluid.

[0116] The driving device (40) comprises the driving shaft (41) and drives the impact member (20) and the friction member (10) to rotate.

[0117] The plurality of friction members (10) are arranged on the drive shaft (41) at any interval; the peripheral surface of the friction member is directly facing the inner wall (33) of the main cavity (30) at any distance, and when the drive shaft rotates, the gas-liquid mixed fluid rubs against the peripheral surface of the friction member and the two side surfaces perpendicular to the axis, and at the same time, rubs against the inner wall (33) of the main cavity (30), so that the bubbles contained in the gas-liquid mixed fluid are stretched, deformed and fragmented. The rotation speed of the front end of the side surface perpendicular to the axis of any one or more of the friction members (10) is set to be greater than 8 m / sec.

[0118] At least one of the one or more impact members (20) and the plurality of friction members (10) is provided with any one of a distribution hole (14a) (24a) or a cut-out channel (14b) to guide the flow of the gas-liquid mixed fluid to a side surface perpendicular to the axis.

[0119] The gas-liquid mixed fluid may be in various forms, for example: mixed water of water and air, mixed water of water and other liquids and air, mixed water of water and air and additional gases such as oxygen (O2), ozone (O3), and hydrogen (H2), mixed oil of industrial oil and additional gases such as oxygen (O2), ozone (O3), and hydrogen (H2), etc.

[0120] The gas-liquid mixed fluid may include: tap water, groundwater, river water, fresh water, etc. containing bubbles generated during the water supply process.

[0121] The impact member (20) is as follows Figure 5 , 16 As shown, when rotating, the protrusions (21) arranged in the shape of gears or the like on the periphery exert impact and shear force on the bubbles contained in the gas-liquid mixed fluid, so that the bubbles are refined into micron size; the friction member (10) exerts friction force again on the bubbles that have been refined into micron size by the impact member, so that the bubbles are stretched and deformed and refined to a finer nanometer size.

[0122] When the impact member (20) and the friction member (10) rotate, especially when the impact member (20) rotates, the fluid is thrown out toward the inner wall (33) of the main cavity by centrifugal force, and the inner wall (33) exerts friction on the fluid. The fluid shuttles in the space between the rotating body composed of the impact member (20) and the friction member (10) and the inner wall (33) of the main cavity, forming a spiral rotating flow (such as Figure 4 ).

[0123] When the impact member (20) and the friction member (10) rotate, centrifugal force is generated in the main cavity, causing the flow to be biased toward the inner wall (33) of the main cavity. In particular, the friction effect of the friction member (10) on the two side surfaces (12) perpendicular to the axis on the fluid will mostly disappear.

[0124] The plurality of friction members (10) are arranged at intervals so that when the drive shaft rotates, the fluid forms a spiral rotation flow (such as Figures 2 to 4 ). The bubbles contained in the gas-liquid mixed fluid, such as Figure 1 As shown in (b), arc-shaped stretching deformation, decomposition, and further refinement occur on the circumferential surface (11) of the friction member (10) and the two side surfaces (12) perpendicular to the axis, especially the inner wall (33) of the main cavity (30) with a larger area, thereby generating nanobubbles.

[0125] At this time, the necessary conditions for generating nanobubbles are sufficient friction surface, the rotation speed of the friction member (10) that determines the flow rate, and an appropriate distance between the friction member (10) and the inner wall (33) of the main cavity; the "directly facing" in the above description of the friction member (10) is "the peripheral surface (11) of the friction member and the inner wall (33) of the main cavity are directly facing each other at an arbitrary distance" (such as Figures 2 to 4 As shown) means that no component is provided to block the friction member and the inner wall of the main cavity, so that the inner wall of the main cavity is completely exposed to the flow channel of the fluid; that is, it means that the fixing member provided on the inner wall of the main cavity in the prior art is excluded.

[0126] The distribution hole (14a) or the cut-out channel (14b) is provided on the friction member (10), so as to prevent the above-mentioned phenomenon that the flow is deflected toward the inner wall (33) of the main cavity under the action of centrifugal force, and make the two side surfaces (12) of the friction member (10) perpendicular to the axis play the role of friction surface (such as Figures 2 to 4 , Figures 10 to 12 ).

[0127] In further detail, the distribution hole (14a) or the cut-out channel (14b) is provided on the friction member (10), so that the fluid passes through the main body of the friction member (10), passes through the main body of each friction member, and forms a flowable channel along the two side surfaces (12) perpendicular to the axis. Therefore, the two side surfaces (12) of the friction member perpendicular to the axis to the portion close to the drive shaft (41) all play a role in friction with the fluid, thereby increasing the effective friction area of ​​the friction member.

[0128] Furthermore, by providing the distribution hole (14a) or the cut-out channel (14b), the spiral rotation flow of the fluid is increased and accelerated, thereby improving the frictional force that affects the refinement of the bubbles.

[0129] Therefore, the distribution hole (14a) or the cut-out channel (14b) should preferably be arranged at a position close to the shaft hole (13) of the friction member (10), but is not limited thereto (e.g. Fig.10 ).

[0130] The cut-out channel (14b) is arranged on a friction member (such as Fig.12 (a)), from the front end of the periphery to the inner side and to the center (such as Fig.11 / 12 (b)), but not limited to this, various forms such as forming a slope in the radial direction can be adopted.

[0131] Each part of the friction member (10) divided by the cut-out channel (14b) may take the shape of a blade at any angle (e.g. Fig.12 (c)). The friction element of this structure has a friction effect on the fluid, and according to its setting direction, it has a function of accelerating or controlling the flow rate, and can control the phenomenon that the friction of the fluid tends to the inner wall of the main cavity.

[0132] The second embodiment of the present invention is a nano bubble generating system (1B) using friction, such as Figures 2 to 5 As shown, it mainly comprises a main cavity (30), one or more impact members (20), a plurality of friction members (10) and a driving device (40).

[0133] The main cavity (30) comprises an internal space (S) required for miniaturizing bubbles contained in the gas-liquid mixed fluid, an inlet (31) and an outlet (32), and is provided with a driving shaft (41).

[0134] The one or more impact members (20) are arranged on the driving shaft (41), and the impact members have a plurality of protrusions (21) so as to impact the gas-liquid mixed fluid flowing into the main cavity and rotate the fluid so that the fluid rubs against the inner wall (33) of the main cavity.

[0135] The plurality of friction members (10) are arranged on the driving shaft (41) to increase the friction force on the gas-liquid mixed fluid.

[0136] The driving device (40) comprises the driving shaft (41) and drives the impact member (20) and the friction member (10) to rotate.

[0137] The plurality of friction members (10) are arranged at arbitrary intervals, and the peripheral surface (11) of the friction member is directly facing the inner wall (33) of the main cavity at arbitrary intervals. When the drive shaft rotates, the gas-liquid mixed fluid rubs against the peripheral surface of the friction member and the two side surfaces perpendicular to the axis, and at the same time, rubs against the inner wall of the main cavity, so that the bubbles contained in the gas-liquid mixed fluid are stretched, deformed and fragmented.

[0138] One or more small-diameter friction members (10S) and one or more large-diameter friction members (10L) with a relatively larger radius are arranged at random intervals. According to the flow direction, it is preferable to first arrange the small-diameter friction member (10S) on the drive shaft, but the present invention is not limited thereto. The small-diameter friction member (10S) and the large-diameter friction member (10L) can be arranged alternately.

[0139] In the nano bubble generating system (1B) using friction of the second embodiment, the structure and arrangement of the friction member (10) is that the small-diameter friction member (10S) and the large-diameter friction member (10L) are arranged at random intervals. In the limited main cavity space, the interval between the large-diameter friction members (10L) is increased, and the small-diameter friction member (10S) is arranged between them to form an effective friction space and friction area for the fluid.

[0140] If the friction members (10) are arranged in a continuous pattern with the same specifications, and the intervals between the friction members are not large, the flow direction will tend to the inner wall (33) of the main cavity due to the centrifugal force. At this time, most of the effects of the two side surfaces (12) of the friction member (10) perpendicular to the axis will disappear. However, when the friction members are arranged unevenly due to the difference in radius, even if the intervals between the friction members (10) are relatively small, the entire surface of the friction member (10) body can also play the role of an effective friction surface (such as Figures 2 to 4 ).

[0141] In addition, if the microbubble refinement stage is not set, directly applying friction to the gas-liquid mixed fluid will reduce the efficiency of the generator and the refinement quality of the bubbles.

[0142] Therefore, if Figures 4 to 5 As shown, on the driving shaft (41) of the nanobubble generating system (1A) of the first embodiment and the nanobubble generating system (1B) of the second embodiment, a micron refinement zone (S1) and a nanometer refinement zone (S2) are sequentially arranged according to the flow direction of the fluid; the micron refinement zone (S1) is formed by arranging more than one impact member (20) to first refine the bubbles contained in the gas-liquid mixed fluid flowing into the main cavity (30) to the microbubble stage.

[0143] The nano-refining zone (S2) is arranged after the micro-refining zone (S1) according to the flow direction of the fluid, and is formed by arranging more than one friction member (10) to further refine the bubbles refined to micron size into nano-bubbles.

[0144] In the nano-refining zone (S2), one or more impact members (20) may be provided to generate a strong centrifugal force (such as Figure 4 ).

[0145] like Figure 5 As shown, in the micron-refined zone (S1), on the inner wall of the main cavity opposite to the impact member (20), an annular fixing member (60) may be provided. The annular inner periphery of the fixing member (60) may form a plurality of protrusions (61).

[0146] The length of the micron-refined section (S1) is preferably a shorter section that is less than 1 / 3 of the length of the nano-refined section (S2), but the invention is not limited thereto.

[0147] The greater the number of the impact members (20), the stronger the spiral rotation flow of the fluid, the greater the flow resistance, and the smaller the discharge volume.

[0148] According to the above structure, the gas-liquid mixed fluid flowing in through the inlet (31) of the main cavity at an arbitrarily set flow rate is first refined to the micron bubble stage by the impact and shear force applied by the impact member (20) in the micron refinement zone (S1) composed of the impact member (20) and the inner wall (33) of the main cavity adjacent thereto. Next, in the spiral rotating flow, the nanometer refinement zone (S2) composed of the friction member (10) and the inner wall (33) of the main cavity adjacent thereto undergoes tensile deformation through friction, and is further enhanced in stages to be extremely refined and effectively generate nano bubbles.

[0149] In addition, the micron-refined area (S1) and the nano-refined area (S2) are arranged in the same main cavity and driven by the same driving device. If the scale is enlarged, the load on the driving device will be too large.

[0150] In view of the above problems, a nano bubble generating system (1C) using friction according to a third embodiment of the present invention separates a micro bubble stage refinement device (20A) (20B) using an impact member (20) and a nano bubble generating device (10A) using a friction member (10) into independent devices having a separate main cavity and a driving device, thereby dispersing the driving load. The gas-liquid mixed fluid first passes through the micro bubble stage refinement device (20A) (20B) and then flows into the nano bubble generating device (10A) (such as Figure 6 ).

[0151] The nano bubble generating system (1C) using friction according to the third embodiment of the present invention is as follows: Figures 6 to 9 As shown, it includes more than one microbubble stage refinement device (20A) (20B) and a nanobubble generating device (10A).

[0152] The microbubble stage refinement device (20A) (20B) refines the bubbles to the micron stage by applying impact and shear force to the gas-liquid mixed fluid; the nanobubble generating device (10A) refines the bubbles after the microbubble stage refinement device (20A) ( 20B) The gas-liquid mixed fluid exerts friction to refine the bubbles to the nanobubble stage.

[0153] The nano bubble generating device (10A) is as follows Figure 7 to 8 As shown, it mainly includes a first main cavity (30A), one or more friction members (10) and a first driving device (40A).

[0154] The first main cavity (30A) comprises an internal space (S) capable of accommodating a gas-liquid mixed fluid, an inner wall (33) capable of exerting friction on the fluid, and an inlet (31) and an outlet (32) for the fluid.

[0155] The one or more friction members (10) are rotated through the driving shaft (41) of the first main cavity (30A) to generate centrifugal force to throw the fluid toward the inner wall. At the same time, the one or more friction members (10) can exert friction on the fluid.

[0156] The first driving device (40A) comprises the driving shaft (41) and drives the friction member (10) to rotate.

[0157] The microbubble stage refinement device (20A), as Fig. 9 As shown, it mainly includes a second main chamber (30B), one or more impact members (20) or impellers (20f) and a second driving device (40B).

[0158] The second main cavity (30B) comprises an internal space (S) capable of accommodating a gas-liquid mixed fluid, an inlet (31) and an outlet (32), and is provided with a driving shaft (41).

[0159] The one or more impact members (20) or impellers (20f) are arranged on the driving shaft (41), and the impact member has a plurality of protrusions (21) to cause impact on the fluid.

[0160] The second driving device (40B) includes the driving shaft (41) and drives the impact member (20) or the impeller (20f) to rotate.

[0161] When the impact piece (20) of the microbubble stage refinement device (20A) rotates, the protrusions (21) arranged in the shape of gears or the like on the periphery exert impact and shear force on the bubbles contained in the gas-liquid mixed fluid, so that the bubbles are refined into micron size, so as to prepare for the next step of effectively generating nanobubbles through friction.

[0162] The nanobubble generating system (1B) of the second embodiment and the nanobubble generating system (1C) of the third embodiment may be similar to the nanobubble generating system (1A) of the first embodiment, wherein at least one of the distribution holes (14a) (24a) or the cut-out channels (14b) is provided in at least one of the friction member (10) and the impact member (20) to guide the flow of the gas-liquid mixed fluid to the side surface perpendicular to the axis.

[0163] The nano bubble generating system (1B) of the second embodiment and the nano bubble generating system (1C) of the third embodiment can be similar to the nano bubble generating system (1A) of the first embodiment, wherein the rotation speed of the front end of the side surface perpendicular to the axis in any one or more of the friction parts is preferably set to be greater than 8 m / sec.

[0164] In any one or more of the friction members (10) in the nanobubble generating system (1A) of the first embodiment, the nanobubble generating system (1B) of the second embodiment, and the nanobubble generating system (1C) of the third embodiment, the distance (I) from the front end of the side surface perpendicular to the axis to the inner wall (33) of the main cavity is set to be less than 1 / 2 of the radius of the friction member, so that the inner wall (33) of the main cavity is used to apply friction to the gas-liquid mixed fluid (such as Figure 3 , Figure 7 ).

[0165] The rotation speed and the spacing (I) are based on the friction element (10) having the largest radius.

[0166] In addition, the friction member (10) closest to the main cavity outlet (32) may have an inclined surface (17) formed at its periphery and at its edges and corners facing the main cavity outlet (such as Figure 2 , Figure 4 , Figure 8 ).

[0167] As mentioned above, the corners of the friction member (10) form an inclined surface (17) toward the outflow port, which can delay the separation point of the fluid and increase the friction efficiency.

[0168] In addition, at least one of the plurality of friction members (10) may form an annular or spiral groove (16) (such as Fig.13 ).

[0169] The groove (16) formed on the peripheral surface (11) of the friction member can increase the friction area against the fluid.

[0170] In addition, in order to increase the friction area, at least one of the friction member (10) and the impact member (20) has at least one concave surface (15) (such as Fig.13 ).

[0171] In addition, in order to expand the friction area, at least one of the friction member (10) and the impact member (20) may have fine concave-convex portions (not shown) formed on a portion of its surface, and the surface of the fine concave-convex portion may be roughened, sandblasted, scratched, or other methods.

[0172] In addition, two or more friction members (10) or impact members (20) can form an integrated multiple friction member (10m) or multiple impact member (such as 14) through a connecting portion (18).

[0173] The multiple friction member (10m) may be formed by two or more layers of disc-shaped bodies with different radius sizes.

[0174] In addition, one or more friction members (10) and one or more impact members (20) may form an integrated structure (not shown).

[0175] In addition, at least one of the friction members (10) may be formed by an impeller-type friction member (10c) having a plurality of blades (112) (e.g. Fig.15 ).

[0176] The impeller-type friction member (10c) may take various shapes, including the manner in which the blades (112) are formed between two sides perpendicular to the axis (such as Fig.15 (a), (b)), or one side is open and the leaves are exposed to one side (such as Fig.15 (c)) etc.

[0177] The impeller-type friction element (10c) increases the rotational flow velocity while guiding the flow direction to the central position, suppressing friction from being biased toward the inner wall of the main cavity and expanding the friction area.

[0178] In addition, in at least one of the impact members (20) of the nanobubble generating system (1A) of the first embodiment, the nanobubble generating system (1B) of the second embodiment, and the nanobubble generating system (1C) of the third embodiment, the protrusion (21) is formed on the circumferential surface of the disc-shaped body and on one of the two side surfaces (22) perpendicular to the axis (such as Fig.17 ).

[0179] In addition, one or more of the impact members (20) has one or more concave surfaces (25) and a plurality of distribution holes formed on one or more of the two side surfaces (22) of the disc-shaped body perpendicular to the axis, and a plurality of the protrusions (21) can be provided on the circumferential surface of the body and any one or more of the inner or outer sides of the concave surfaces (25) (e.g. Fig.18 ).

[0180] The protrusion of at least one of the impact members (20) can be a blade-shaped protrusion (21a) such as a blade of an exhaust fan. This structure can improve the function of the impact member and increase the flow rate (not shown).

[0181] The nano bubble generating device (10A) is similar to the friction member (10) of the nano bubble generating system (2B) of the second embodiment, and is arranged at random intervals on the driving shaft (41), and is formed by one or more small-diameter friction members (10S) and one or more large-diameter friction members (10L) having a larger radius than the small-diameter friction members (10S), which are mixed and arranged at random intervals.

[0182] The driving shaft (41) of the nano bubble generating device (10A) may be provided with one or more friction members (10) and one or more impact members (20) in the micro bubble stage refinement device (20A) (e.g. Figure 8 ).

[0183] As described above, an impact piece (20) having a protrusion (21) on its circumferential surface is provided in the nano bubble generating device (10A), especially at the starting point of the flow direction, which will generate impact force and strong centrifugal force on the fluid, thereby strengthening the friction force of the inner wall (33) of the first main cavity.

[0184] In addition, at least one of the impact members (20) of the microbubble stage refinement device (20A) has a plurality of protrusions (21) formed at least on its periphery; and at least one portion of the inner wall (33) of the second main cavity (30B) has a plurality of protrusions (37) formed directly or indirectly (such as Fig.19 , Fig. 20 ).

[0185] A protrusion (37) is provided on the inner wall of the main cavity of the microbubble stage refinement device (20A), which can, together with the protrusion (21) of the impact piece, exert a greater impact force and shear force on the fluid.

[0186] The impeller (20f) is arranged on the driving shaft (41) of the microbubble stage refinement device, the inlet of the impeller (20f) is connected to the inlet of the main cavity by an inlet pipe (31a), and a radial protrusion (37) is arranged on the inner wall (33) of the second main cavity (30B), so as to form a pump-type microbubble stage refinement device (20B) (such as Fig.21 , Fig. 22 ).

[0187] The shape of the protrusion (37) on the inner wall of the second main cavity (30B) may be ribbed, but is not limited thereto.

[0188] In the pump-type microbubble stage refinement device (20B), when the fluid flowing in through the impeller (20f) collides with the inner wall (33) and the protrusion (37) of the second main cavity, a collision between the fluids occurs in the internal space of the second main cavity, generating cavitation, exerting impact force and shear force on the fluid, and generating micron bubbles.

[0189] A volute-type pipe (27) may be provided between the impeller (20f) of the pump-type microbubble stage refinement device (20B) and the inner wall (33) of the second main cavity (30B) to suck in the gas-liquid mixed fluid and guide it to the inner wall (33) of the second main cavity (such as Fig. 22 ).

[0190] As described above, by providing a volute-type pipe (27) between the impeller (20f) and the inner wall (33) of the second main cavity (30B), the fluid is gathered together, which generates a greater water pressure conflict on the inner wall (33b) of the second main cavity and the protrusion (37), thereby strengthening the impact force and shear force and generating a stronger cavitation effect.

[0191] The nanobubble generating system (1C) of the third embodiment is as follows Figure 6 As shown, a variety of arrangements are possible.

[0192] For example, according to the flow line of the gas-liquid mixed fluid, a pump (P), a microbubble stage refinement device (20A) (20B), and a nanobubble generating device (10A) are arranged in sequence (such as Figure 6 (a)).

[0193] Alternatively, the pump (P) and the microbubble stage refinement device (20A) (20B) are set in a set and arranged in parallel, and a nanobubble generating device (10A) is connected after the plurality of microbubble stage refinement devices (20A) (20B). The fluid flowing out of the plurality of microbubble stage refinement devices (20A) (20B) is gathered and processed by the nanobubble generating device (10A) (such as Figure 6 (b)).

[0194] Alternatively, according to the flow line of the gas-liquid mixed fluid, the pump (P) and the plurality of microbubble stage refinement devices (20A) (20B) are arranged in series, and then connected to the nano bubble generating device (10A) (such as Figure 6 (c) and (d)).

[0195] In addition, when a large amount of gas such as oxygen is injected at one time into the flow line of the gas-liquid mixed fluid, overflow may occur due to temporary oversaturation of the gas.

[0196] In the embodiment of the present invention, the gas injection can be performed at multiple parts of the fluid flow line, thereby preventing the gas from overflowing due to supersaturation, so that the gas-liquid mixed fluid contains a large amount of gas, thereby increasing the generation efficiency of nanobubbles (such as Figure 6 (c)).

[0197] In addition, the above embodiments (such as Figure 6 The water pump (P) in (a), (b), (c), (d)) may not be set (e.g. Figure 6 (e)).

[0198] For example, when the microbubble stage refinement device is a pump type (20B) or the impact piece has a blade type protrusion (21a), it is not necessary to provide the pump (P).

[0199] As described above, according to the nano bubble generating system (1C) of the third embodiment of the present invention, the micro bubble stage refinement device (20A) (20B) and the nano bubble generating device (10A) are provided with separate main cavities and drive devices, respectively, and can operate independently. Therefore, the bubbles are refined in stages, nano bubbles are generated efficiently, and even in a large-capacity nano bubble generating system, the driving load can be dispersed, and it can be operated without burden by a general motor.

[0200] The nanobubble generating system (1D) using friction according to the fourth embodiment of the present invention is as follows: Fig.23 , Fig.24 As shown, it comprises a main cavity (30), one or more impact and friction parts (10b) and a driving device (40).

[0201] The main cavity (30) includes an internal space (S) required for miniaturizing bubbles contained in the gas-liquid mixed fluid, an inlet (31) and an outlet (32), and is provided with the driving shaft (41).

[0202] The one or more impact and friction parts (10b) are arranged on the drive shaft (41), and have a plurality of protrusions (11b) and friction parts (12b); the protrusions (11b) exert impact on the gas-liquid mixed fluid flowing into the main cavity (30), causing the fluid to rotate and rub against the inner wall of the main cavity; the friction parts (12b) can exert friction force on the fluid.

[0203] The driving device (40) includes the driving shaft (41) and is capable of rotating the impact and friction member (10b).

[0204] The impact and friction member (10b) is arranged on the drive shaft (41) at an arbitrary spacing, and its peripheral surface is directly disposed opposite to the inner wall (33) of the main cavity at an arbitrary spacing (I) (such as Fig.24 ).

[0205] The friction portion (12b) of the impact and friction member (10b) is a side surface perpendicular to the axis and, like the friction member, generates friction on the fluid when rotating.

[0206] The impact and friction member (10b) performs impact and friction simultaneously. When rotating, its protrusion (11b) applies impact and shear force to the bubbles contained in the gas-liquid mixed fluid, thereby reducing the bubbles to the micron bubble stage. The friction part (12b) applies a strong friction force to the bubbles that have been reduced to micron size, causing the micron bubbles to be stretched and deformed again and extremely reduced to nano bubbles.

[0207] When the impact and friction member (10b) rotates, in particular the protrusion (11b), generates centrifugal force, which vigorously throws the fluid onto the inner wall (33) of the main cavity, and uses the inner wall (33) of the main cavity to rub the fluid, while the gas-liquid mixed fluid shuttles between the impact and friction member (10b) and the inner wall (33) of the main cavity, forming a spiral rotating flow (such as Fig.23 , Fig.24 ).

[0208] At least one of the distribution holes (14a) or the cut-out channels (14b) is provided in the impact and friction parts (10b) to guide the flow of the gas-liquid mixed fluid to the side surface perpendicular to the axis (such as Fig.24 ).

[0209] In addition, the impact and friction parts (10b) are arranged in a plurality of rows at arbitrary intervals on the drive shaft (41). In order to refine the bubbles contained in the gas-liquid mixed fluid from the micron bubble stage to the nano bubble stage, the protrusion size (11a) of the protrusion (11b) can be relatively reduced in sequence according to the arrangement order in the flow direction (as shown in FIG. 24).

[0210] According to the nano bubble generating system (1D) of the fourth embodiment of the present invention, the impact and friction member (10b) is arranged on the driving shaft, and more than one friction member (10) can be arranged at the rear of the driving shaft (not shown).

[0211] At least one of the impact and friction members (10b) is provided with the protrusion (11b) (not shown) on the peripheral surface of the main body or on one or more of the two side surfaces perpendicular to the axis.

[0212] The rotation speed of the impact and friction member (10b) is also set to be above 8 m / sec, and the arbitrary distance (I) from the inner wall (33) of the main cavity is preferably below 1 / 2 of the radius of the impact and friction member (10b).

[0213] The shaft holes (13) (23) of the friction member (10) and the impact member (20) may be polygonal or key-shaped structures corresponding to the cross-section of the drive shaft (41), so that when the drive shaft (41) rotates, they rotate as a whole (such as Figure 3 , Figure 5 ).

[0214] In addition, the main cavity (30) (30A) (30B) forms a funnel portion (34) at the outflow port (32), and the outflow port (32) is formed in continuation of the funnel portion (34) and is located on the central extension line of the driving shaft of the main cavity (such as Figure 2 , Figure 7 ).

[0215] In the main cavity, the funnel portion (34) and the outflow port (32) are arranged on the central extension line of the drive shaft (41), so that the fluid rotating around the inner wall (33) of the main cavity flows smoothly and can flow out smoothly even if the pressure inside the main cavity is not high pressure.

[0216] The main cavity (30) (30A) (30B) may form a fine concave-convex portion (35) (such as Figure 2 , Figure 7 ). The fine concavoconvex part (35) can be formed by scratching, sandblasting, etc. The fine concavoconvex part (35) can be arranged in the inflow area of ​​the main cavity, such as the micron refinement area (S1), to increase the impact and friction on the fluid, but is not limited thereto.

[0217] In addition, one or more impellers (not shown) may be added to the driving shaft (41) in the nanobubble generating system (1A) of the first embodiment to the nanobubble generating system (1D) of the fourth embodiment, close to the inlet (31) of the main cavity (30) (30A) (30B).

[0218] As described above, an impeller is arranged in the main cavity (30), so that the gas-liquid mixed fluid can flow into the main cavity in a self-priming manner.

[0219] In addition, the injected gases such as oxygen (O2), ozone (O3), and hydrogen (H2) cannot all be dissolved in the liquid during the processing process through the main cavity (30). About 40% are discharged in an undissolved state. After being discharged from the main cavity, they float from the liquid and disappear in the air, resulting in a large loss.

[0220] In order to prevent such loss, a gas collection tank (80) can be set up through the connecting pipeline to recover the undissolved gas floating from the gas-liquid mixed fluid and re-introduce it (not shown).

[0221] According to Table 1 and Table 2, the working state of the nano bubble generating system (1A) (1B) (1C) (1D) using friction according to the first to fourth embodiments of the present invention can be further understood.

[0222]

Table 1

[0223]

[0224]

Table 2

[0225]

[0226] In Table 1 and Table 2,

[0227] I is the distance between the front end of the side surface of the friction member (10) perpendicular to the axis and the inner wall (33) of the main cavity; R is the radius of the friction member (10). All tests and examples are carried out under the following conditions:

[0228] 1. Test material: tap water (DO: 8.5ppm)

[0229] 2. Test temperature: 24±0.5℃

[0230] 3. Injection gas and injection method: Oxygen (O2 100%), self-priming

[0231] 4. DO measurement time: 20 seconds after flowing out of the nanobubble generating system

[0232] 5. Method for judging whether nanobubbles are generated: After the test is implemented, collect the sample, shake it for 5 seconds, and stop for 3 minutes. After the time for the micron bubbles to disappear has passed, use a green laser beam (wavelength 532 nm) in a dark room to confirm and judge with the naked eye.

[0233] Unlike microbubbles that appear milky white in water, nanobubbles are transparent, so it is impossible to confirm whether they are generated under normal lighting conditions. After collecting the sample in a transparent container, it is confirmed in a dark room through a green laser beam with a shorter wavelength.

[0234] At this time, if there are nanobubbles floating in the water, the laser beam will scatter and produce light. If the nanobubbles do not exist, no light will be produced.

[0235] In the sample that has undergone the above test process, when a green laser beam is projected, densely scattered light in the form of a band is observed, thus confirming that nanobubbles are generated.

[0236] As shown in the test results of Tables 1 and 2 above, generally speaking, the faster the rotation speed of the friction member, the more dissolved oxygen (DO) is produced. Under the same rotation speed of the friction member, the distance (I) between the front end of the side surface of the friction member perpendicular to the axis and the inner wall of the first main cavity, in Test 2 where the distance is set to a narrower distance, the increase in DO is better than in Test 1 where the distance is set to a wider distance.

[0237] In addition, the increase in DO is not necessarily proportional to the generation of nanobubbles. This may be because the DO value was temporarily increased by the microbubbles that disappeared 2 to 3 minutes after the flow out of the nanobubble generator.

[0238] The test results of the above-described examples are summarized as follows.

[0239] First, when the rotation speed of the friction member is at least 8 m / sec, the microbubbles will be extremely refined to generate nanobubbles; in the embodiments where the rotation speed of the friction member is reduced to below 8 m / sec, no significant nanobubbles are generated (Example 5 of Test 1, Example 5 of Test 2), and when the rotation speed is above 8 m / sec, the higher the rotation speed, the more rapidly the generation of nanobubbles increases.

[0240] In many embodiments including the nano bubble generating system (1A) of the first embodiment, the rotation speed of the friction member is required to be above 8 m / sec based on this rule of thumb.

[0241] Second, the distance (I) between the front end of the side surface of the friction member (10) perpendicular to the axis and the inner wall (33) of the main cavity is preferably close to less than 1 / 2 of the radius (R) of the friction member (10) (I<1 / 2R) (e.g. Figure 7(b), (c)).

[0242] As in the embodiment of Experiment 1: the distance (I) between the front end of the side surface of the friction member (10) perpendicular to the axis and the inner wall (33) of the main cavity is set to a relatively far distance (such as 1 / 2R) or more (I>1 / 2R) of the friction member (10). Figure 7 (c)) and the embodiment of Test 2: the spacing (I) is set to a narrower spacing (such as about 12 / 100 of the radius (R) of the friction member (10) Figure 7 (b) ), when the two items are compared, the DO and nanobubble generation efficiency of Experiment 1 embodiment are significantly low.

[0243] This phenomenon is because the centrifugal force and flow velocity caused by the rotation of the friction member (10) gradually weaken before reaching the inner wall (33) of the main cavity, reducing the friction force of the inner wall of the main cavity. When the spacing (I) is reduced to less than 1 / 2 of the radius (R) of the friction member (10) as in the embodiment of Experiment 2, DO increases and nanobubbles are efficiently generated.

[0244] In addition, the plurality of friction members (10) are arranged in an intermittent manner, and when the drive shaft rotates, the fluid generates a spiral rotation flow (such as Figure 4 , Figure 7 (a) Figure 8 ), bubbles in gas-liquid mixed fluids such as Figure 1 As shown in (b), the circumferential surface (11) of the rotating friction member (10) and the two side surfaces (12) perpendicular to the axis, especially the inner wall (33) of the main cavity (30) (30A) with a large area, are stretched and deformed into an arc shape, decomposed into smaller parts, and further refined to generate nanobubbles.

[0245] As described above, the necessary conditions for the generation of nanobubbles are sufficient friction surface, the rotation speed of the friction member (10) that guides the flow rate, and the effective formation of an appropriate distance between the friction member (10) and the inner wall (33) of the main cavity.

[0246] The inner wall (33) of the main cavity directly facing the friction member (10) refers to the surface where fluid friction is caused by centrifugal force when the friction member (10) and the impact member rotate, and is therefore not limited to the inner wall of the main cavity (30), but may also include the inner walls of other components arranged on the inner wall of the main cavity.

[0247] That is to say, the inner wall (33) of the main cavity can be replaced by another component provided on the inner wall of the main cavity for any purpose in addition to the inner wall of the main cavity (30) itself. The common feature of the nano bubble generating system (1A) (1B) (1C) (1D) using friction in the first to fourth embodiments of the present invention is that the fixing part, which is the main component of the conventional technology, is excluded in the nano bubble generating device provided with the friction part. If the fixing part is provided on the inner wall of the main cavity, the inner wall of the main cavity cannot be used as the friction surface. Therefore, the flow of the gas-liquid mixed fluid is not smooth, and it is impossible to generate a spiral rotating flow, thereby failing to achieve the purpose of the present invention. That is, it has a more A wide effective friction surface can significantly improve the quality and efficiency of the miniaturization of nanobubbles generated by friction, and can generate them in large quantities; the present invention can be compared to the generator technology exemplified below; the generator of traditional technology includes a casing, a fixed part and a rotating part, and is a mechanical device that converts mechanical work into electrical energy; assuming that based on a new technical idea, the fixed part is eliminated, and electrical energy is generated through the organic structure of the casing and the new rotating part, and high-quality, large-capacity energy that was completely unpredictable with previous technologies is produced at a low cost, and the function and effect are significantly improved, this new technology should be recognized as progressive; the present invention and the new generator technology exemplified above can be regarded as the same case.

[0248] The best embodiment of the present invention has been described above with reference to the accompanying drawings.

[0249] The interpretation of the terms or words used in this specification and claims shall not be limited to the usual meaning or the meaning in the dictionary, but shall be interpreted as the meaning and concept consistent with the technical idea of ​​the present invention. The above-described embodiments of the present invention and the structures illustrated in the accompanying drawings are only embodiments of the present invention and cannot represent all the technical ideas of the present invention. All kinds of replacements or modifications that do not depart from the scope of the present invention shall be included in the technical solution of the present invention.

[0250]

Industrial Applicability

[0251] The nanobubble generating system of the present invention can generate nanobubbles with good quality and yield. Therefore, the nanobubble generating system of the present invention that can generate effective and excellent nanobubbles can be easily utilized in the entire industrial field that requires large-capacity nanobubbles.

[0252]

Explanation of symbols

[0253] 1A, 1B, 1C, 1D: Nano bubble generation system

[0254] 10: Friction member 10A: Nano bubble generating device

[0255] 10b: Impact and friction part 10c: Impeller type friction part

[0256] 10L: Large diameter friction member 10S: Small diameter friction member

[0257] 10m: Multiple friction parts 11: Peripheral surface 11a: Protruding size

[0258] 11b: Protrusion

[0259] 12: Side 13: Shaft hole

[0260] 14a: Distribution hole 14b: Cut-out channel

[0261] 15: Concave surface

[0262] 16: groove 17: inclined surface 18: connection part

[0263] 20: Impact piece 20A: Micro bubble stage refinement device

[0264] 20B: Pump type micro bubble stage refinement device 20f: Impeller

[0265] 21: protrusion 22: side 23: shaft hole 24: distribution hole

[0266] 25: Concave surface 27: Volute pipe

[0267] 30: Main cavity 30A: Main cavity 30B: Main cavity

[0268] 31: Inlet 32: Outlet 33: Inner wall

[0269] 34: Funnel 35: Micro-concave and convex part

[0270] 37: protrusion 31a: inflow pipe

[0271] 40: driving device 40A: first driving device 40B: second driving device

[0272] 41: Drive shaft

[0273] I: Spacing S: Internal space S1: Micron-refined area S2: Nano-refined area

Claims

1. A nanobubble generating system using friction, characterized in that: Contains: A main cavity, including an internal space required for miniaturizing bubbles contained in the gas-liquid mixed fluid, an inlet and an outlet, and provided with a driving shaft; One or more impact members are disposed on the drive shaft, and the one or more impact members have a plurality of protrusions to impact the gas-liquid mixed fluid flowing into the main cavity and cause the fluid to rotate and rub against an inner wall of the main cavity; A plurality of friction members are disposed on the driving shaft to increase the friction force on the gas-liquid mixed fluid; as well as a driving device, comprising the driving shaft, driving the impact member and the friction member to rotate; The plurality of friction members are arranged on the driving shaft at any interval, and the peripheral surfaces of the plurality of friction members are directly facing the inner wall of the main cavity at any distance; The rotation speed of the front end of the side surface perpendicular to the axis of any one or more of the plurality of friction members is set to be greater than 8 m / sec; At least one of the one or more impact members and the plurality of friction members is provided with at least one of a distribution hole and a cut-out channel to guide the flow of the gas-liquid mixed fluid to a side surface perpendicular to the axis.

2. A nanobubble generating system using friction, characterized in that: Contains: A main cavity, including an internal space required for miniaturizing bubbles contained in the gas-liquid mixed fluid, an inlet and an outlet, and provided with a driving shaft; One or more impact members are disposed on the drive shaft, and the one or more impact members have a plurality of protrusions to impact the gas-liquid mixed fluid flowing into the main cavity and cause the fluid to rotate and rub against an inner wall of the main cavity; A plurality of friction members are disposed on the driving shaft to increase the friction force on the gas-liquid mixed fluid; as well as a driving device, comprising the driving shaft, driving the impact member and the friction member to rotate; The plurality of friction members are arranged on the driving shaft at any interval, and the peripheral surfaces of the plurality of friction members are directly facing the inner wall of the main cavity at any distance; The plurality of friction members are arranged at random intervals, and are composed of one or more small-diameter friction members and one or more large-diameter friction members having a relatively larger radius than the small-diameter friction members.

3. The nanobubble generating system using friction as claimed in any one of claims 1 or 2, wherein the driving shaft is sequentially arranged in a micron refinement interval and a nanometer refinement interval; The micron refinement zone is composed of one or more impact members arranged to decompose bubbles contained in the gas-liquid mixed fluid flowing into the main cavity into microbubble stages; The nano-refining zone is arranged after the micro-refining zone according to the flow direction, and is composed of more than one friction member arranged to further refine the bubbles in the micro-refining stage into nano-bubbles.

4. A nanobubble generating system using friction, characterized in that: It includes one or more micro-bubble stage refinement devices and nano-bubble generation devices; The one or more micro-bubble stage refinement devices refine the bubbles to the micron stage by applying impact and shear force to the gas-liquid mixed fluid; The nanobubble generating device applies friction force to the gas-liquid mixed fluid passing through the microbubble stage refinement device to refine the bubbles to the nanobubble stage; The nano bubble generating device comprises a first main cavity, one or more friction members and a first driving device; The first main cavity comprises an inner space capable of accommodating the gas-liquid mixed fluid, an inner wall capable of exerting friction on the fluid, a fluid inlet and a fluid outlet; The one or more friction members are rotated by a driving shaft arranged in the first main cavity to generate centrifugal force to throw the fluid toward the inner wall. At the same time, the one or more friction members play a role of friction on the fluid. The first driving device includes the driving shaft, which drives the friction member to rotate; The microbubble stage refinement device comprises a second main chamber, one or more impact members or impellers and a second driving device; The second main cavity comprises an inner space capable of accommodating the gas-liquid mixed fluid, an inlet and an outlet, and is provided with a driving shaft; The one or more impact members or impellers are disposed on the drive shaft, and the one or more impact members or impellers have a plurality of protrusions to cause impact on the fluid; The second driving device includes the driving shaft, which drives the impact member or the impeller to rotate.

5. The nanobubble generating system using friction as claimed in claim 2 or 4, wherein at least one of the friction member and the impact member is provided with at least one of a distribution hole or a cut-out channel to guide the flow of the gas-liquid mixed fluid to a side surface perpendicular to the axis.

6. The nano bubble generating system using friction as claimed in any one of claims 1, 2 and 4, wherein at least one of the friction members is composed of an impeller-type friction member having a plurality of blades.

7. The nanobubble generating system using friction as claimed in claim 4, wherein the driving shaft of the nanobubble generating device is provided with one or more friction members and one or more impact members in the microbubble stage refinement device.

8. The nanobubble generating system using friction as described in claim 4, wherein at least one of the impact members of the microbubble stage refinement device has a plurality of protrusions formed at least around its periphery; and a plurality of protrusions are formed directly or indirectly on a portion of the inner wall of the second main cavity.

9. The nanobubble generating system using friction as claimed in claim 4, wherein the impeller is arranged on the driving shaft of the microbubble stage refinement device, the inlet of the impeller is connected to the inlet of the main cavity by an inlet pipe, and a radial protrusion is arranged on the inner wall of the second main cavity to form a pump-type microbubble stage refinement device.

10. The nanobubble generating system using friction as claimed in claim 9, wherein a volute-type pipe can be arranged between the impeller of the pump-type microbubble stage refinement device and the inner wall of the second main cavity to suck in the gas-liquid mixed fluid and guide it to the inner wall of the second main cavity.

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