A gas-liquid or liquid-liquid mixed ultrafine bubble generating device

Abstract

The present invention relates to the field of bubble generation, and in particular to a gas-liquid or liquid-liquid mixed ultrafine bubble generating device, comprising: a cavity, including an inner flow cavity, used to accelerate, mix and cut liquid I and gas or liquid II, and form a gas-liquid mixture; a flow guide port, used to input liquid I into the cavity; a gas-liquid inlet, used to input gas or liquid II into the cavity; a spiral track, placed in the cavity, i.e., in the inner flow cavity, used to accelerate the swirl of liquid I and gas or liquid II; a nozzle, located in the center of the cavity, used to spray gas and liquid. The present invention can achieve gas-liquid or liquid-liquid mixing, that is, mixing two fluids with different densities. Through the swirling track, the contact time and contact area of ​​gas-liquid mixing can be increased, and the gas and liquid can be fully contacted by multiple swirling, thereby improving the gas-liquid mixing efficiency and reducing energy loss.

Description

Technical Field

[0001] The invention relates to the technical field of bubble generation, in particular to a gas-liquid or liquid-liquid mixed ultrafine bubble generating device. Background Art

[0002] Ultrafine bubbles or liquid bubbles have extremely wide applications in actual production and life. Ultrafine bubbles can be used in various fields of life, such as fruit and vegetable washing, aquaculture, crop yield increase, sewage purification, healthy beverages, medical treatment, etc. Ultrafine liquid bubbles can fully mix solutions of different densities and are used in industry, medical treatment, and new energy fields. However, the concentration of ultrafine bubbles produced by existing ultrafine bubble generating devices is too low, the number of ultrafine bubbles is too small, and it is not easy to store for a long time. Moreover, the existing ultrafine bubble generating devices have high power, high energy consumption, large and bulky equipment, and a small scope of application. It is difficult to be widely used in the field of daily life and cannot meet the actual needs of multi-purpose.

[0003] In response to the above-mentioned deficiencies, the applicant proposed a technical solution for a swirling ultrafine bubble generating device (application publication number CN109316990A) on November 23, 2018 (hereinafter referred to as "the solution"). The solution generates ultrafine bubbles by mechanical cutting, which solves the problems of large volume, high power, high energy consumption and low efficiency of traditional bubble generating devices, and greatly expands the application scope of ultrafine bubble generating devices. However, the solution still has the following deficiencies: the inner flow cavity is external, and the volume of the entire device cannot be further compressed. Its diameter is larger than the negative pressure cavity, resulting in a large energy loss from the negative pressure cavity to the inner flow cavity; the overall number of swirling acceleration of the liquid (or gas) from the negative pressure cavity to the inner flow cavity and in the process of being stirred into a mixed liquid is still not high, so the gas-liquid mixing efficiency and the cutting and stirring efficiency will need to be improved. In view of this, the applicant once again proposed a gas-liquid or liquid-liquid mixed ultrafine bubble generating device to solve the deficiencies of the solution. Summary of the invention

[0004] The object of the present invention is to provide a gas-liquid or liquid-liquid mixed ultrafine bubble generating device to solve the problems raised in the above background technology.

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

[0006] A gas-liquid or liquid-liquid mixed ultrafine bubble generating device, comprising:

[0007] The cavity includes an inner flow cavity, which is used for accelerating, mixing and cutting liquid I and gas or liquid II, and forming gas-liquid;

[0008] A flow guide port, used to input liquid into the cavity I;

[0009] Gas and liquid inlet, used to input gas or liquid into the cavity II;

[0010] The spiral track is placed in the cavity, i.e., the inner flow cavity, and is used to accelerate the liquid I and the gas or liquid II to rotate (increase the contact area and prolong the contact time);

[0011] The nozzle is located in the center of the cavity and is used for spraying gas and liquid.

[0012] Furthermore, the cavity body has an inner flow cavity built therein, and an outer flow cavity is formed between the inner flow cavity wall of the inner flow cavity and the cavity body;

[0013] The flow guide port is used to input liquid I into the external flow cavity;

[0014] The gas-liquid inlet is used to input gas or liquid II into the inner flow cavity;

[0015] The liquid I undergoes a swirling acceleration once entering the outer flow cavity, and then continues to accelerate a second time to generate negative pressure after entering the inner flow cavity, so as to suck in the gas or liquid II entering from the gas-liquid inlet, fully mix and cut it, and form gas-liquid.

[0016] Furthermore, there are multiple groups of small holes on the wall of the inner flow cavity, and the small holes are distributed along the tangent line of the inner flow cavity.

[0017] Furthermore, the small holes have a plurality of longitudinal rows, close to the inner flow cavity wall of the nozzle, and the number of small holes in each longitudinal row is a plurality.

[0018] Furthermore, a spiral track is installed in the center of the bottom wall of the inner flow cavity, and the spiral track can fill the cavity of the inner flow cavity, or in the upper half or lower half of the cavity, the surface of the spiral track has lines, protrusions or grooves.

[0019] Furthermore, the inner bottom of the cavity is provided with a groove, and the inner surfaces of the outer flow cavity and the inner flow cavity are smooth surfaces.

[0020] Furthermore, the spiral track rises and falls in a wave shape and continuously rotates around the central axis, and each spiral keeps a certain distance d from the adjacent track after rotating itself.

[0021] Furthermore, the two adjacent tracks of the spiral track rise and fall at a certain angle, extending continuously in a sawtooth shape, rotating around the central axis, each turning angle is greater than or equal to 0 and less than or equal to 180 degrees, and the gap between the two adjacent tracks maintains a certain distance d.

[0022] Furthermore, two adjacent tracks of the spiral track rotate around the central axis of the cavity, and a certain distance d is maintained between the two tracks. A baffle is provided in the gap, and the baffle is rectangular. The baffles of the two tracks are arranged in an alternating manner.

[0023] Furthermore, the inner flow cavity or the outer flow cavity can be a cylinder, a spindle, a cone, or a truncated cone.

[0024] Furthermore, the inner flow cavity and the outer flow cavity are similar in shape, and the diameter of one end is different from or the same as that of the other end.

[0025] Furthermore, the nozzle is arranged at the center of the top of the cavity and has a diameter smaller than the diameter of the inner flow cavity. The guide port is arranged on the upper side wall of the cavity and is inserted with a guide outer tube. The gas-liquid inlet is a tube with an inlet inserted on the bottom side wall or bottom of the cavity.

[0026] Furthermore, the diversion outer tube is externally connected to the source of the supply liquid I, the gas-liquid inlet is connected to a detachable water source or gas source, and the diversion port and the gas-liquid inlet are equipped with regulating valves and / or flow meters.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] Liquid I (usually water) is connected to the outer guide tube. After entering the (outer flow cavity and) inner flow cavity, liquid I swirls. A spiral track is provided inside the inner flow cavity. The fluid fully swirls along the track in the inner flow cavity. At this time, negative pressure is generated in the center of the inner flow cavity. After the gas or liquid II is sucked in, liquid I and gas or liquid II are violently cut and stirred, and then ejected from the nozzle to achieve the purpose of gas-liquid or liquid-liquid mixing.

[0029] The present invention can achieve gas-liquid or liquid-liquid mixing, that is, mixing two fluids with different densities. The contact time and contact area of ​​the gas-liquid mixing can be increased through the spiral track. The soda and water can be fully contacted through multiple spirals, thereby improving the gas-liquid mixing efficiency and reducing energy loss.

[0030] The present invention provides a spiral track so that water continuously enters and rises and falls inside, and in the process, the bubbles are cut into smaller pieces. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the structure of the present invention.

[0032] Figure 2 Another structural schematic diagram of the present invention.

[0033] Figure 3 Schematic diagram of the internal spiral track of the present invention.

[0034] Figure 4 It is a top view schematic diagram of the spiral track of the present invention.

[0035] Figure 5 This is a schematic diagram of the structure of the present invention without the spiral track.

[0036] Figure 6 For the present invention Figure 5 Schematic diagram of the cross-section at AA in the middle.

[0037] Figure 7 For the present invention, Figure 4 Schematic diagram of the missing spiral track after installation.

[0038] Figure 8 For the present invention Figure 7 Schematic diagram of the cross-section at AA in the middle.

[0039] Fig. 9 The liquid I of the present invention enters Figure 5 Schematic diagram of acceleration.

[0040] Fig.10 Another schematic diagram of the spiral track of the present invention from a top view Figure 1 .

[0041] Fig.11 Another schematic diagram of the spiral track of the present invention from a top view Figure 2 .

[0042] Fig.12 Another schematic diagram of the spiral track of the present invention from a top view Figure 3 .

[0043] In the figure: 1-cavity, 2-guiding outer tube, 3-gas-liquid inlet, 4-nozzle, 5-inner flow cavity wall, 6-outer flow cavity, 7-inner flow cavity, 8-spiral track, 9-small hole, 10-guiding port, 11-wavy shape, 12-serrated shape, 13-baffle. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] In the description of the present invention, it should be noted that the terms "upper / lower end", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0046] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "setting / sleeving", "sleeve connection", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] Example 1

[0048] See also Figure 1-2 , 4-9, the present invention provides a technical solution:

[0049] A gas-liquid or liquid-liquid mixed ultrafine bubble generating device, comprising:

[0050] The cavity 1 has an inner flow cavity 7 built therein, and an outer flow cavity 6 is formed between the inner flow cavity wall 5 of the inner flow cavity 7 and the cavity 1;

[0051] The flow guide port 10 is used to input liquid I into the outer flow cavity 6;

[0052] A gas-liquid inlet 3, used to input gas or liquid II into the inner flow cavity 7;

[0053] The liquid I undergoes a swirling acceleration once entering the outer flow chamber 6, and then continues to accelerate for a second time to generate negative pressure after entering the inner flow chamber 7, so as to absorb the gas or liquid II entering from the gas-liquid inlet 3, fully mix and cut the gas or liquid II, and form gas-liquid;

[0054] The nozzle 4 is located at the center of the cavity 1 and is used for spraying gas and liquid.

[0055] Specifically, there are multiple groups of small holes 9 on the inner flow cavity wall 5 , and the small holes 9 are distributed along the tangent line of the inner flow cavity 7 .

[0056] Specifically, the small holes 9 have multiple longitudinal rows, and are close to the inner flow cavity wall 5 of the nozzle 4. The number of small holes 9 in each longitudinal row is multiple. Preferably, the small holes 9 have four longitudinal rows, and the number of small holes 9 in each longitudinal row is three. The angle between two adjacent longitudinal rows is 90°, so that a good acceleration effect can be achieved. In this embodiment, the diameter of each small hole 9 is smaller than the diameter of the nozzle 4.

[0057] Specifically, a spiral track 8 is installed at the center of the inner bottom wall of the inner flow cavity 7. The gas-liquid flow direction of the spiral track is the same as the liquid flow direction of the small hole, which is more conducive to full mixing, reduces energy consumption, and increases the contact area.

[0058] Specifically, the inner bottom of the outer flow cavity 6 is provided with a groove, and the inner part of the outer flow cavity 6 is a smooth surface.

[0059] Specifically, the spiral track 8 can fill the cavity of the inner flow cavity 7, or be in the upper half or lower half of the cavity. The surface of the spiral track 8 has textures, protrusions or grooves. The size of the texture protrusions on the surface has certain restrictions. It cannot be too large to affect the flow rate, nor too small to be detrimental to sufficient mixing. The protrusions or grooves are optional and not necessary.

[0060] Specifically, the inner flow cavity 7 is similar in shape to the outer flow cavity 6, and the diameter of one end is different from or the same as that of the other end.

[0061] Specifically, the nozzle 4 is arranged at the center of the top of the cavity 1, and its diameter is smaller than the diameter of the inner flow cavity 7. The guide port 10 is arranged on the upper side wall of the cavity 1, and is inserted with a guide outer tube 2. The gas-liquid inlet 3 is a tube with an inlet inserted on the bottom side wall or bottom of the cavity 1. The inner walls of the guide outer tube and the inner flow cavity are also required to be smooth to reduce energy loss.

[0062] Specifically, the outer guide tube 2 is externally connected to the source of the supply liquid I, and the gas-liquid inlet 3 is connected to a detachable water source or gas source.

[0063] Specifically, the flow guide port 10 and the gas-liquid inlet 3 are installed with regulating valves and / or flow meters. (Installation of valves and flow meters is also optional and not mandatory).

[0064] The technical principle of embodiment 1 is:

[0065] Liquid I (usually water) is connected to the outer guide tube 2, swirled once along the outside of the inner flow cavity 7, and then enters the inner flow cavity 7 from multiple groups of thick small holes 9 (also called tangent holes) on the inner flow cavity wall 5, and swirled twice inside the inner flow cavity 7; a swirling track is provided inside the inner flow cavity 7, and fluid I fully swirles along the track in the inner flow cavity 7. At this time, negative pressure is generated in the center of the inner cavity, and after the gas or liquid II is sucked in, liquid I and the gas or liquid II are violently cut and stirred, and then ejected from the nozzle 4 to achieve the purpose of gas-liquid or liquid-liquid mixing. A threaded connector can be externally connected to the nozzle 4, and a device for controlling the angle and direction can be externally connected to the threaded connector, but this is also optional and not necessary.

[0066] like Figure 10-12 As shown, the spiral track 8 is around the outer cavity, rotating around the central axis, and the shape includes but is not limited to the following shapes:

[0067] (1): Wave shape 11, the spiral track 8 is undulating up and down in a wave shape 11 and continuously rotates around the central axis. After each spiral rotates by itself, it keeps a certain distance d from the adjacent track, so that when the gas and liquid flow along the gap of the spiral track, the contact area and contact time of the gas and liquid are greatly increased, and the effect of gas-liquid mixing is more obvious;

[0068] (2): The two adjacent tracks rise and fall at a certain angle, extending continuously like a sawtooth shape 12, and rotating around the central axis. Each turning angle is greater than or equal to 0 and less than or equal to 180 degrees. The gap between the two adjacent tracks maintains a certain distance d, so that when the gas and liquid flow along the gap of the spiral track, the contact area and contact time of the gas and liquid are greatly increased, and the effect of gas-liquid mixing is more obvious;

[0069] (3): Two adjacent tracks rotate around the central axis of the cavity, and the gap between the two tracks is kept at a certain distance. A baffle 13 is provided in the gap. The baffle 13 is polygonal or arc-shaped. Each baffle is arranged in such a way that the lower part is sealed and the upper part is slit, or the lower part is slit and the upper part is sealed, the left side is sealed and the right side is slit, or the right side is sealed and the left side is slit, and they are alternately arranged in the track gap. The advantage of such an arrangement is that the gas-liquid mixture can only be pushed forward through the winding baffle, so as to achieve mutual cutting and forward flow, thereby better achieving the ultrafine bubble dispersion effect.

[0070] The spiral tracks 8 in the above-mentioned forms prolong the gas-liquid mixing time and contact area through the tortuous shape of each track, so that a large amount of turbulence is generated when the gas and liquid flow between the tracks, achieving the effect of mutual cutting and mixing, and finally generating a large number of nano-level bubbles.

[0071] Example 2

[0072] See also Figure 3 The present invention provides a technical solution, which is basically the same as that of Example 1, except that:

[0073] A gas-liquid or liquid-liquid mixed ultrafine bubble generating device, comprising:

[0074] The chamber 1 includes an inner flow chamber 7, which is used to accelerate, mix and cut liquid I and gas or liquid II, and form gas-liquid;

[0075] The flow guide port 10 is used to input liquid I into the cavity 1;

[0076] A gas-liquid inlet 3, used for inputting gas or liquid II into the cavity 1;

[0077] The spiral track 8 is disposed in the cavity 1 and is used to accelerate and swirl the liquid I and the gas or liquid II to fully mix them.

[0078] The nozzle 4 is located at the center of the cavity 1 and is used for spraying gas and liquid.

[0079] In this embodiment, there is only one cavity, namely the inner flow cavity 7.

[0080] The technical principle of embodiment 2 is:

[0081] Liquid I (usually water) is connected to the guide outer tube 2. Liquid I enters the inner flow cavity 7 and swirls. A spiral track 8 (also called a swirling track) is provided inside the inner flow cavity 7. The fluid swirls rapidly and sufficiently along the track in the inner flow cavity 7. At this time, negative pressure is generated in the inner cavity center of the inner flow cavity 7. After the gas or liquid II is sucked in, liquid I and the gas or liquid II are violently cut and stirred and then ejected from the nozzle 4 to achieve the purpose of gas-liquid or liquid-liquid mixing.

[0082] The present invention is further described below:

[0083] Before liquid I enters the inner flow chamber 7, it enters the outer flow chamber 6. The outer flow chamber 6 wraps around the outside of the inner flow chamber 7. Liquid I undergoes a swirling acceleration inside the outer flow chamber 6 along the tangential direction of the outer side of the inner flow chamber 7: after entering the outer flow chamber 6, liquid I swirls at high speed along the inner wall of the outer flow chamber 6, moves downward from the upper part of the outer flow chamber 6, and then moves upward, generating centrifugal force, which can accelerate the swirling speed of liquid I. The interior of the outer flow chamber 6 is required to be smooth to improve efficiency and reduce energy loss.

[0084] There are multiple groups of small holes 9 on the inner flow cavity 7. The small holes 9 are processed along the tangent of the inner flow cavity 7, so that after the liquid I enters the inner flow cavity 7 along the small holes 9, it continues to accelerate twice and swirls at high speed along the inner flow cavity 7. To achieve double swirl acceleration: the diameter of the small holes is small, and the liquid I (such as water) in the outer flow cavity 6 is rushed into the small holes 9 along the tangent direction, so that the flow rate of the small holes 9 is greater than the flow rate of the liquid in the outer flow cavity 6. The liquid I enters the inner flow cavity 7 and continues to swirl at high speed along the inner wall of the inner flow cavity 7 to generate negative pressure. After being fully mixed with the gas or liquid II entering from the bottom, it continues to swirl in the inner flow cavity 7 and is fully cut, which can fully accelerate the liquid I and reduce energy loss.

[0085] A flow channel is arranged inside the inner flow cavity 7. The channel is open and not sealed. The liquid pressure inside the channel can be transmitted freely. The liquid accelerated twice swirls along the channel for many times.

[0086] When liquid I swirls in the inner flow cavity 7, negative pressure is generated, and the external gas or liquid II is sucked into the inner flow cavity 7. Then, the gas or liquid II is fully contacted with liquid I by swirling multiple times in the inner flow cavity 7, and is sprayed out after being stirred.

[0087] If the negative pressure is insufficient, an external water pump or air pump can be connected to press the gas or liquid II into the inner flow cavity 7, and then spray it out after mixing with the liquid I.

[0088] There are grooves at the bottom to prevent corrosion to the bottom caused by gas or liquid swirling inside the inner flow cavity 7. At the same time, the inner flow cavity 7 is required to be smooth to improve efficiency and reduce energy loss.

[0089] As in Example 2, the inner flow cavity 7 may be unnecessary and dispensable (ie, the inner flow cavity may be increased).

[0090] The spiral track can fill the inner flow cavity 7 of the cavity, or it can be in the upper half or lower half of the inner flow cavity 7. The size is not specified, and the guide track can be added or removed according to needs.

[0091] The surface of the spiral track may be provided with textures, protrusions or grooves, which may increase the contact time and contact area of ​​gas-liquid mixing and improve the gas-liquid mixing efficiency.

[0092] After the gas-liquid or liquid-liquid mixture is sprayed out from the nozzle 4, the size of the nozzle 4 is smaller than the minimum diameter of the outer flow cavity 6 or the inner flow cavity 7.

[0093] The inner flow cavity 7 or the outer flow cavity 6 can be a cylinder, a spindle, a cone, a truncated cone, etc., that is, the diameter of one end can be different from or the same as that of the other end.

[0094] The flow guide port 10 (the installation port of the flow guide outer tube 2) / the gas-liquid inlet 3 can be installed (or not installed) with a regulating valve and a flow meter, which can control the amount of gas / liquid intake and read flow data.

[0095] Materials include but are not limited to metals, plastics, ceramics, silicon-containing materials, carbon-containing materials, etc.

[0096] The present invention can achieve gas-liquid or liquid-liquid mixing, that is, mixing two fluids with different densities. The two different liquids here, such as oil, water, fat, benzene, etc., which are not soluble in each other due to different densities, can be fully mixed after passing through the device.

[0097] The remaining parts of the present invention not described may be the same as the prior art and will not be described in detail here.

[0098] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A gas-liquid or liquid-liquid mixed ultrafine bubble generating device, characterized in that: include: The cavity (1) includes an inner flow cavity (7) for accelerating, mixing and cutting liquid I and gas or liquid II to form gas-liquid; A flow guide port (10) for inputting liquid I into the outer flow cavity (6); A gas-liquid inlet (3) for inputting gas or liquid II into the inner flow cavity (7); A spiral track (8) is disposed in the inner flow chamber (7) and is used to accelerate the liquid I and the gas or liquid II in a spiral manner; A nozzle (4) is located at the center of the cavity (1) and is used to spray gas and liquid; A plurality of groups of small holes (9) are provided on the inner flow cavity wall (5), and the small holes (9) are distributed along the tangent line of the inner flow cavity (7); The cavity (1) has an inner flow cavity (7) therein, and an outer flow cavity (6) is formed between the inner flow cavity wall (5) of the inner flow cavity (7) and the cavity (1); The liquid I undergoes a swirling acceleration once entering the outer flow chamber (6), and then continues to accelerate a second time to generate negative pressure after entering the inner flow chamber (7), thereby sucking in the gas or liquid II entering through the gas-liquid inlet (3) and fully mixing and cutting them to form gas-liquid.

2. The gas-liquid or liquid-liquid mixed ultrafine bubble generating device according to claim 1, characterized in that: The small holes (9) have a plurality of longitudinal rows, and are located close to the inner flow cavity wall (5) of the nozzle (4), and the number of small holes (9) in each longitudinal row is a plurality.

3. The gas-liquid or liquid-liquid mixed ultrafine bubble generating device according to claim 1, characterized in that: A spiral track (8) is installed at the center of the inner bottom wall of the inner flow cavity (7). The spiral track (8) can fill the cavity of the inner flow cavity (7), or is located in the upper half or lower half of the cavity. The surface of the spiral track (8) has textures, protrusions or grooves. The inner bottom of the cavity (1) has grooves. The inner parts of the outer flow cavity (6) and the inner flow cavity (7) are smooth surfaces.

4. The gas-liquid or liquid-liquid mixed ultrafine bubble generating device according to claim 3, characterized in that: The spiral track (8) rises and falls in a wave shape (11) and continuously rotates around the central axis. After each spiral rotates on its own, it maintains a certain distance d from the adjacent track.

5. The gas-liquid or liquid-liquid mixed ultrafine bubble generating device according to claim 3, characterized in that: The two adjacent tracks of the spiral track (8) rise and fall at a certain angle, similar to a sawtooth shape (12) that continuously extends and rotates around the central axis. Each turning angle is greater than or equal to 0 and less than or equal to 180 degrees, and the gap between the two adjacent tracks maintains a certain distance d.

6. The gas-liquid or liquid-liquid mixed ultrafine bubble generating device according to claim 3, characterized in that: Two adjacent tracks of the spiral track (8) rotate around the central axis of the cavity, and a certain distance d is maintained between the two tracks. A baffle (13) is provided in the gap, and the baffle (13) is rectangular. The baffles (13) of the two tracks are arranged in a staggered manner.

7. The gas-liquid or liquid-liquid mixed ultrafine bubble generating device according to any one of claims 1 to 6, characterized in that: The inner flow cavity (7) is similar in shape to the outer flow cavity (6), and the diameter of one end is different from or the same as that of the other end.

8. The gas-liquid or liquid-liquid mixed ultrafine bubble generating device according to claim 7, characterized in that: The inner flow chamber (7) or the outer flow chamber (6) is a cylinder, a spindle, a cone, or a truncated cone.

9. The gas-liquid or liquid-liquid mixed ultrafine bubble generating device according to claim 1, characterized in that: The nozzle (4) is arranged at the center of the top of the cavity (1) and has a diameter smaller than the diameter of the inner flow cavity (7). The flow guide port (10) is arranged on the upper side wall of the cavity (1) and is inserted with a flow guide outer tube (2). The gas-liquid inlet (3) is a tube with an inlet inserted on the bottom side wall or the bottom of the cavity (1). The flow guide outer tube (2) is externally connected to a source for supplying liquid I. The gas-liquid inlet (3) is connected to a detachable water source or gas source. The flow guide port (10) and the gas-liquid inlet (3) are provided with regulating valves and / or flow meters.

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