Jet flow self-suction type micro-nano bubble generator

Abstract

The invention relates to a jet flow self-suction type micro-nano bubble generator which comprises a water inlet connector, a water outlet connector, an air inlet connector, an outer sleeve and a plurality of micro-nano bubble generating monomers, and the micro-nano bubble generating monomers are sequentially in butt joint end to end to form a micro-nano bubble generating assembly. The micro-nano bubble generating assembly is adaptively installed in the outer sleeve in the axial direction of the outer sleeve, the outer side walls of the multiple micro-nano bubble generating single bodies abut against the inner side wall of the outer sleeve in an adaptive mode, air inlet spaces communicating with one another are reserved, and a jet flow channel is formed in the inner side wall of the micro-nano bubble generating assembly. Air inlet holes for communicating the air inlet space with the jet flow channel are formed in the side walls of the plurality of micro-nano bubble generation monomers; the water inlet connector and the water outlet connector are installed at the two ends of the outer sleeve correspondingly and communicate with the jet flow channel correspondingly. The air inlet connector is installed on the outer side wall of the outer sleeve and communicates with the air inlet space. The inner side wall of the end, close to the water inlet connector, of the outer sleeve is provided with a tapered channel.

Description

Technical Field

[0001] This invention relates to the technical field of bubble generators, specifically to a jet-type self-aspirating micro / nano bubble generator. Background Technology

[0002] Micro-nano aeration technology is a highly efficient gas dissolution technology that has been widely used in water treatment in recent years. Traditional aeration technologies mainly rely on large or medium-sized bubbles, which suffer from low gas utilization, high energy consumption, and unsatisfactory dissolution efficiency. With the development of nanotechnology and materials science, micro-nano bubbles have become a research hotspot due to their unique physicochemical properties (such as high specific surface area, long residence time, and strong oxidation capacity). Currently, micro-nano aeration technology has shown significant advantages in wastewater treatment, aquaculture, and industrial wastewater treatment, but technical bottlenecks such as unstable bubble generation, complex equipment, high maintenance costs, and high operating costs still exist.

[0003] In existing technologies, the generation of micro- and nanobubbles is mainly achieved through mechanical shearing, pressure dissolution, and electrolysis. Mechanical shearing uses a high-speed rotating impeller or venturi tube to generate shearing force, breaking large bubbles into micro- and nanobubbles, but it is energy-intensive and prone to wear. Pressure dissolution dissolves gas in a liquid under high pressure, then suddenly depressurizes to release the gas, forming micro- and nanobubbles; however, the equipment is complex, maintenance costs are high, mixing time is long, and the results are unstable. Electrolysis directly generates micro- and nanobubbles through electrode reactions, but the electrodes have short lifespans and easily pollute water bodies. In addition, there are some emerging technologies such as ultrasonic methods and membrane separation methods, but these are still in the laboratory stage and have not yet been widely applied.

[0004] The main drawbacks of existing technologies include: (1) low and unstable bubble generation efficiency; (2) complex equipment structure and high maintenance cost; (3) high energy consumption and poor operating economy; and (4) some technologies (such as electrolysis) are prone to secondary pollution. Summary of the Invention

[0005] In order to solve one or more technical problems existing in the prior art, the present invention provides a jet self-aspiration micro-nano bubble generator.

[0006] The technical solution of this invention to solve the above-mentioned technical problems is as follows: This invention provides a jet self-priming micro / nano bubble generator, including a water inlet connector, a water outlet connector, an air inlet connector, an outer sleeve, and multiple micro / nano bubble generating units. The multiple micro / nano bubble generating units are sequentially connected end-to-end to form a micro / nano bubble generating assembly. The micro / nano bubble generating assembly is adapted and installed inside the outer sleeve along the axial direction of the outer sleeve. The outer sidewalls of the multiple micro / nano bubble generating units are adapted and abut against the inner sidewall of the outer sleeve and have reserved air inlet spaces that are interconnected. The inner sidewall of the micro / nano bubble generating assembly forms a jet channel. Air inlet holes are opened on the sidewalls of the multiple micro / nano bubble generating units to connect the air inlet spaces with the jet channel. The water inlet connector and the water outlet connector are respectively installed at both ends of the outer sleeve and are respectively connected to the jet channel. The air inlet connector is installed on the outer sidewall of the outer sleeve and is connected to the air inlet space. A tapered channel is provided on the inner sidewall of the end of the outer sleeve near the water inlet connector.

[0007] The beneficial effects of this invention are as follows: The jet self-aspirating micro-nano bubble generator of this invention, by setting a gradually narrowing channel, allows water to be drawn into the micro-nano bubble generator by the water pump. After entering the micro-nano bubble generator through the gradually narrowing channel, the internal velocity increases and negative pressure is generated. The high speed of the water flow is the key to generating negative pressure for natural air intake. The gas enters the micro-nano bubble generator through the air inlet connector, and then passes through the air intake space and air inlet holes, etc., through a multi-stage turbulence process, to achieve a self-aspirating air intake method, which improves efficiency and has a simple structure.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, the micro / nano bubble generator has a ring-shaped structure. Multiple outer annular steps are formed on the outer wall of the micro / nano bubble generator along its axial direction, and multiple inner annular steps are formed on the inner wall of the micro / nano bubble generator along its axial direction. The outer diameter of the outer annular step and the inner diameter of the inner annular step gradually decrease along the water inlet direction, so that the two ends of the micro / nano bubble generator along the axial direction are respectively formed as a large end and a small end. The small end of one micro / nano bubble generator is adapted to be inserted into the inner side of the large end of an adjacent micro / nano bubble generator and forms an air inlet chamber through the cooperation of the outer and inner annular steps. The air inlets of the two adapted micro / nano bubble generators are both connected to the air inlet chamber.

[0010] The beneficial effects of adopting the above-mentioned further scheme are: by setting multiple outer annular steps and multiple inner annular steps on the micro-nano bubble generating monomers, it is convenient for the micro-nano bubble generating monomers to dock with each other, which facilitates the formation of an air inlet cavity, increases the gas flow path, and facilitates the formation of micro-nano bubbles.

[0011] Furthermore, in the two micro-nano bubble generating monomers that form the air intake cavity, the larger end of the outer side of the air intake cavity is provided with a first air intake hole that communicates with the air intake cavity, and the smaller end of the inner side of the air intake cavity is provided with a second air intake hole that communicates with the air intake cavity.

[0012] The beneficial effect of adopting the above-mentioned further solution is that it facilitates air intake by setting the first air intake port and the second air intake port.

[0013] Furthermore, the diameter of the first air inlet on the same micro / nano bubble generating monomer is larger than that of the second air inlet, and the first and second air inlets connected to the same air inlet chamber are of equal size and are staggered in the axial direction of the micro / nano bubble generating monomer.

[0014] The beneficial effects of adopting the above-mentioned further scheme are as follows: the micro-nano bubble generator is composed of multiple micro-nano bubble generating units, each of which performs gas-liquid mixing in its own stage and further refines the gas in the previous stage. The pore size of each of the multiple micro-nano bubble generating units gradually decreases along the water flow direction. The second air inlet of the unit in this stage is the same size as the first air inlet of the unit in the previous stage and is staggered. With such a multi-stage design, a large number of micro-nano-sized bubbles can be stably generated.

[0015] Furthermore, the plurality of outer annular steps include a first outer annular step, a second outer annular step, and a third outer annular step arranged sequentially with gradually decreasing outer diameter of the step wall. A first air inlet hole is formed on the step wall of the first outer annular step, and a second air inlet hole is formed on the step wall of the third outer annular step. The first air inlet hole is located near the larger end of the step wall, and the second air inlet hole is located away from the smaller end of the step wall.

[0016] Furthermore, the plurality of outer annular steps also include a fourth outer annular step, which is located on the step wall of the first outer annular step, and a ring of the first air inlets is located at one end of the step wall near the step surface of the fourth outer annular step.

[0017] The beneficial effect of adopting the above-mentioned further solution is that by setting the fourth outer annular step, it is convenient to fit and abut with the outer sleeve, and to facilitate the overall assembly.

[0018] Furthermore, the step wall of the fourth outer annular step is adapted to abut against the outer sleeve, and multiple air inlet grooves are provided on the inner side wall of the outer sleeve. The air inlet grooves extend in a direction parallel to the central axis of the outer sleeve and are used to connect all the micro-nano bubble generators with the air inlet space formed between the outer sleeve and the outer sleeve.

[0019] The beneficial effect of adopting the above-mentioned further solution is that by setting up an air intake slot, it is convenient to connect all the air intake spaces.

[0020] Furthermore, in the multi-level inner annular steps, a turbulence structure is formed on the step wall of the inner annular step with the smallest inner diameter; the turbulence structure includes multiple triangular teeth evenly arranged circumferentially along the micro-nano bubble generating monomer, the cross-section of the multiple triangular teeth is triangular, the triangular teeth extend in a direction parallel to the central axis of the micro-nano bubble generating monomer, and a turbulence groove is formed between two adjacent triangular teeth, the two ends of the turbulence groove respectively penetrating the step surface of the inner annular step and the small end face of the micro-nano bubble generating monomer.

[0021] The beneficial effects of adopting the above-mentioned further scheme are: by setting up a turbulence structure, the gas can be sheared and broken, and then enter the jet channel for gas-liquid mixing, which can cause violent collisions between gas and liquid, and further refine the bubbles.

[0022] Furthermore, it also includes a limiting cylinder, one end of which is adapted to be connected to the large end of the micro-nano bubble generating monomer at the beginning, and the other end of which is adapted to be connected to the water inlet connector. The limiting cylinder forms the tapered channel, the inner diameter of which gradually decreases along the water inlet direction, and the inner diameter of the small end of the tapered channel is the same as the inner diameter of the small end of the micro-nano bubble generating monomer.

[0023] The beneficial effects of adopting the above-mentioned further solution are as follows: By setting a limiting cylinder, the stable positioning of each component can be achieved. A gradually narrowing channel is formed inside the limiting cylinder, and the maximum radius of the internal space of the subsequent micro-nano bubble generator is the radius after the gradual narrowing. After water is pumped into the micro-nano bubble generator by the water inlet pump, it first enters the interior of the micro-nano bubble generator through the gradually narrowing channel. The water flows at high speed inside the micro-nano bubble generator, and the internal speed increases to generate negative pressure. Air is drawn into the air inlet chamber through the air inlet connector, and then enters the interior of the micro-nano bubble generator unit through the air inlet hole of each micro-nano bubble generator unit. First, the gas is sheared and broken by the turbulence cutting negative pressure component of the micro-nano bubble generator unit, and then enters the jet channel for violent collision, further refining the bubbles.

[0024] Furthermore, it also includes a first limiting plate and a second limiting plate. The first limiting plate is located between the limiting cylinder and the water inlet connector, and the second limiting plate is located between the tail end micro-nano bubble generating monomer and the water outlet connector. A square water inlet hole is opened in the middle of the first limiting plate, and a square water outlet hole is opened in the middle of the second limiting plate.

[0025] The beneficial effects of adopting the above-mentioned further scheme are: by setting square water inlet holes and square water outlet holes, eddies can be reduced, energy consumption can be reduced, and the water flow pattern can be made more stable.

[0026] When the jet self-absorption micro-nano bubble generator of the present invention is used, the process of generating jet micro-nano bubbles is as follows: negative pressure gas intake stage (generating a high-speed liquid jet to draw in gas) → shearing and breaking stage (achieving intense gas-liquid mixing and initially breaking the gas into micro-nano bubbles) → compression and refinement stage (further compressing and refining the bubbles to the nanoscale to improve bubble stability) → depressurization to release the supersaturated solution.

[0027] The various components of this invention are highly adjustable and can meet different usage requirements. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural diagram of the micro / nano bubble generation structure of the present invention. Figure 1 ; Figure 2 This is a three-dimensional structural diagram of the micro / nano bubble generation structure of the present invention. Figure 2 ; Figure 3 This is a three-dimensional structural diagram of the micro / nano bubble generation structure of the present invention. Figure 3 ; Figure 4 This is a side view schematic diagram of the micro / nano bubble generation structure of the present invention; Figure 5 This is a three-dimensional structural schematic diagram of the micro / nano bubble generating component of the present invention; Figure 6 This is a side view of the micro / nano bubble generating component of the present invention. Figure 7 for Figure 6 Schematic diagram of the cross-sectional structure of AA; Figure 8 for Figure 7 Enlarged structural diagram of section B in the middle; Figure 9 This is a three-dimensional structural diagram of the micro / nano bubble generator of the present invention; Figure 10 A schematic diagram of the main structure of the micro / nano bubble generator for the invention; Figure 11 for Figure 10 Schematic diagram of the cross-sectional structure of BB; Figure 12 for Figure 10 A schematic diagram of the cross-sectional structure of CC.

[0029] The attached diagram lists the components represented by each number as follows: 100. Micro / nano bubble generator monomer; 101. Jet channel; 102. First air inlet; 103. Second air inlet; 104. First outer annular step; 105. Second outer annular step; 106. Third outer annular step; 107. Fourth outer annular step; 108. First inner annular step; 109. Second inner annular step; 110. Turbulence structure; 111. Large end; 112. Small end; 113. Air inlet chamber; 200, Water inlet connector; 300, Water outlet connector; 400, Air inlet connector; 500, Outer sleeve; 501, Limiting sleeve; 502, First limiting plate; 503, Second limiting plate; 504, Air inlet slot. Detailed Implementation

[0030] The principles and features of the present invention are described below. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0031] Example 1 like Figures 1-12 As shown, this embodiment of a jet-driven self-priming micro / nano bubble generator includes a water inlet connector 200, a water outlet connector 300, an air inlet connector 400, an outer sleeve 500, and multiple micro / nano bubble generating units 100. The multiple micro / nano bubble generating units 100 are sequentially joined end-to-end to form a micro / nano bubble generating assembly. The micro / nano bubble generating assembly is adapted and installed within the outer sleeve 500 along its axial direction. The outer walls of the multiple micro / nano bubble generating units 100 are adapted and abut against the inner wall of the outer sleeve 500, and are provided with pre-existing interconnected inlets / outlets. The air intake space includes a jet channel 101 formed on the inner wall of the micro / nano bubble generating component. Multiple micro / nano bubble generating units 100 have air intake holes on their side walls that connect the air intake space to the jet channel 101. A water inlet connector 200 and a water outlet connector 300 are respectively installed at both ends of the outer sleeve 500 and are respectively connected to the jet channel 101. An air inlet connector 400 is installed on the outer wall of the outer sleeve 500 and is connected to the air intake space. A tapered channel is provided on the inner wall of the outer sleeve 500 near the water inlet connector 200.

[0032] The self-aspirating jet-type micro / nano bubble generator of this embodiment features simple individual unit structures and is easy to assemble. The micro / nano bubble generator incorporates multiple stages of micro / nano bubble generating units, enabling the stable generation of a large number of micro / nano bubbles and improving efficiency. An air inlet pipe can be connected to the air inlet connector 400, and a valve can be installed on the air inlet pipe to ensure a uniform gas flow throughout the entire micro / nano bubble generator, thus making the generator's performance more stable.

[0033] The jet-driven self-aspirating micro / nano bubble generator of this embodiment uses a tapered channel. Water is pumped into the micro / nano bubble generator by the water pump and first enters the interior of the micro / nano bubble generator through the tapered channel. The increased internal velocity generates negative pressure. The high speed of the water flow is the key to generating negative pressure for natural air intake. The gas enters the interior of the micro / nano bubble generator through the air inlet connector and then undergoes a multi-stage turbulence process through the air intake space and air inlet holes, achieving a self-aspirating air intake method, improving efficiency, and with a simple structure.

[0034] Example 2 Based on Example 1, this example provides a preferred structure for a micro / nano bubble generating monomer 100. For example... Figures 1-4 As shown, the micro / nano bubble generator 100 in this embodiment has a ring-shaped structure. Multiple outer annular steps are formed on the outer wall of the micro / nano bubble generator 100 along its axial direction, and multiple inner annular steps are formed on the inner wall of the micro / nano bubble generator 100 along its axial direction. The outer diameter of the outer annular step and the inner diameter of the inner annular step gradually decrease along the water inlet direction, so that the two ends of the micro / nano bubble generator 100 along the axial direction are respectively formed as a large end 111 and a small end 112. The small end 112 of one micro / nano bubble generator 100 is adapted to be inserted into the inner side of the large end of an adjacent micro / nano bubble generator 100, and forms an air inlet cavity 113 through the cooperation of the outer and inner annular steps. The air inlets of the two adapted micro / nano bubble generator 100 are both connected to the air inlet cavity 113. By setting multiple outer and inner annular steps on the micro-nano bubble generator monomers, it is convenient for the micro-nano bubble generator monomers to dock with each other, which facilitates the formation of an air inlet cavity, increases the gas flow path, and facilitates the formation of micro-nano bubbles.

[0035] Example 3 Based on Example 2, this example provides a preferred configuration of the air inlet, such as... Figures 1-8 As shown in this embodiment, in the two micro / nano bubble generating monomers 100 forming the air intake cavity 113, the larger end of the outer side of the air intake cavity 113 is provided with a first air intake hole 102 communicating with the air intake cavity 113, and the smaller end 112 of the inner side of the air intake cavity 113 is provided with a second air intake hole 103 communicating with the air intake cavity 113. The provision of the first and second air intake holes facilitates air intake.

[0036] Except for the first and last two micro / nano bubble generating monomers 100, each of the other micro / nano bubble generating monomers 100 has a first air inlet 102 and a second air inlet 103 respectively formed on the step walls of two of the outer annular steps. Both the first air inlet 102 and the second air inlet 103 are connected to the inner cavity of their respective micro / nano bubble generating monomers 100. At least one outer annular step separates the first air inlet 102 from the second air inlet 103. The outer diameter of the step wall where the first air inlet 102 is located... The diameter of the step wall where the second air inlet 103 is located is larger than the outer diameter of the step wall. A ring of second air inlets 103 is formed on one micro / nano bubble generator 100 at the beginning, and a ring of first air inlets 102 is formed on one micro / nano bubble generator 100 at the end. In two adjacent micro / nano bubble generators 100, the second air inlet 103 of one micro / nano bubble generator 100 communicates with the air inlet chamber 113, and the first air inlet 102 of the other micro / nano bubble generator 100 communicates with the air inlet chamber 113. An outer annular step separates the first air inlet 102 from the second air inlet 103.

[0037] like Figure 1 , Figure 4 and Figure 6 As shown, in this embodiment, the diameter of the first air inlet 102 on the same micro / nano bubble generating unit 100 is larger than the diameter of the second air inlet 103. The first air inlet 102 and the second air inlet 103, which are connected to the same air inlet chamber 113, are of equal size and are staggered in the axial direction of the micro / nano bubble generating unit 100. The micro / nano bubble generator is composed of multiple micro / nano bubble generating units. Each unit performs gas-liquid mixing at its own stage, which also further refines the gas from the previous stage. The pore diameter of each stage of the multiple micro / nano bubble generating units gradually decreases along the water flow direction. The second air inlet of the current stage unit is of equal size to the first air inlet of the previous stage unit and is staggered. This multi-stage design can stably generate a large number of micro / nano-sized bubbles.

[0038] like Figures 1-4 As shown, in a specific embodiment, the multiple outer annular steps include a first outer annular step 104, a second outer annular step 105, and a third outer annular step 106 arranged sequentially with gradually decreasing outer diameters of the step walls. A first air inlet 102 is formed on the step wall of the first outer annular step 104, and a second air inlet 103 is formed on the step wall of the third outer annular step 106. The first air inlet 102 is located near the larger end 111 of the step wall, and the second air inlet 103 is located away from the smaller end 112 of the step wall.

[0039] like Figures 1-4As shown, in one specific embodiment, the plurality of outer annular steps further include a fourth outer annular step 107. The fourth outer annular step 107 is located on the step wall of the first outer annular step 104, and a ring of the first air inlet holes 102 is located at one end of the step wall near the step surface of the fourth outer annular step 107. By setting the fourth outer annular step, it is convenient to adapt and abut with the outer sleeve, and to facilitate the overall assembly.

[0040] like Figure 11 As shown, in this embodiment, the step wall of the fourth outer annular step 107 is adapted to abut against the outer sleeve 500. Multiple air inlet grooves 504 are formed on the inner side wall of the outer sleeve 500. These air inlet grooves 504 extend in a direction parallel to the central axis of the outer sleeve 500 and are used to connect all the micro / nano bubble generators 100 with the air inlet space formed between them and the outer sleeve 500. By providing these air inlet grooves, it is convenient to connect all the air inlet spaces.

[0041] Example 4 Based on Example 3, this example provides a preferred configuration of the turbulence structure. For example... Figure 3 , Figure 7 and Figure 8 As shown, in this embodiment, a turbulence structure 110 is formed on the step wall of the inner annular step with the smallest inner diameter in the multi-level inner annular steps. The turbulence structure 110 includes multiple triangular teeth evenly arranged circumferentially along the micro / nano bubble generator 100. The cross-section of the multiple triangular teeth is triangular. The triangular teeth extend in a direction parallel to the central axis of the micro / nano bubble generator 100. A turbulence groove is formed between two adjacent triangular teeth. The two ends of the turbulence groove respectively penetrate the step surface of the inner annular step and the small end face of the micro / nano bubble generator 100. By setting the turbulence structure, the gas can be sheared and broken, and then enter the jet channel for gas-liquid mixing, which can cause violent gas-liquid collisions and further refine the bubbles.

[0042] like Figure 2 and Figure 4 As shown, in a specific embodiment, the multi-level inner annular steps include a first inner annular step 108 and a second inner annular step 109 arranged sequentially with the inner diameter of the step wall gradually decreasing. The first air inlet 102 is located between the step surface of the first inner annular step 108 and the large opening end of the micro-nano bubble generator 100. The second air inlet 103 is arranged through the turbulence structure 110.

[0043] Specifically, in this embodiment, when multiple micro / nano bubble generator monomers 100 are docked, such as... Figure 7 and Figure 8As shown, the first inner annular step 108 can be abutted against the third outer annular step 106, and the first outer annular step 104 can be abutted against the large end of the adjacent micro / nano bubble generator 100. The second outer annular step 105 is not abutted or limited. Since the width of the first inner annular step 108 is greater than the width of the third outer annular step 106, the step walls of part of the first inner annular step 108, the second outer annular step 105, the third outer annular step 106, and part of the step walls of the large end together form an annular air intake cavity 113.

[0044] Example 5 Based on any of the above embodiments, this embodiment provides a preferred assembly structure for a jet-driven self-aspirating micro / nano bubble generator. For example... Figure 11 As shown, the jet self-priming micro / nano bubble generator of this embodiment also includes a limiting cylinder 501. One end of the limiting cylinder 501 is adapted to be connected to the large end of the first micro / nano bubble generating monomer, and the other end of the limiting cylinder 501 is adapted to be connected to the water inlet connector 200. The limiting cylinder 501 forms a tapering channel, and the inner diameter of the tapering channel gradually decreases along the water inlet direction. The inner diameter of the small opening of the tapering channel is the same as the inner diameter of the small end 112 of the micro / nano bubble generating monomer 100.

[0045] Specifically, one end of the outer wall of the limiting cylinder 501 has an outer annular step with the same structure as the micro / nano bubble generating monomer 100. However, the limiting cylinder 501 does not need to form an air inlet cavity 113 with the adjacent micro / nano bubble generating monomer 100; a tight contact is sufficient. The outer wall of the micro / nano bubble generating monomer 100 adjacent to the water outlet connector 300 does not need an outer annular step structure; only an inner annular step structure identical to the other micro / nano bubble generating monomers 100 is required to facilitate the formation of an air inlet cavity 113 with the outer annular step of the adjacent micro / nano bubble generating monomer 100. Specifically, as shown... Figure 11 As shown.

[0046] In a further preferred embodiment, the jet-driven self-aspirating micro / nano bubble generator of this embodiment also includes a first limiting plate 502 and a second limiting plate 503. The first limiting plate 502 is located between the limiting cylinder 501 and the water inlet connector 200, and the second limiting plate 503 is located between the tail-end micro / nano bubble generating unit and the water outlet connector 300. A square water inlet hole is formed in the middle of the first limiting plate 502, and a square water outlet hole is formed in the middle of the second limiting plate 503. By setting the square water inlet hole and the square water outlet hole, eddies can be reduced, energy consumption can be reduced, and the water flow pattern can be made more stable.

[0047] In this embodiment, by setting a limiting cylinder, the stable positioning of each component can be achieved. A gradually narrowing channel is formed inside the limiting cylinder, and the maximum radius of the internal space of the subsequent micro-nano bubble generator is the radius of the gradually narrowing channel. After water is pumped into the micro-nano bubble generator by the water inlet pump, it first enters the interior of the micro-nano bubble generator through the gradually narrowing channel. The water flows at high speed inside the micro-nano bubble generator, and the increased internal speed generates negative pressure. Air is drawn into the air inlet chamber through the air inlet connector, and then enters the interior of the micro-nano bubble generator unit through the air inlet hole of each micro-nano bubble generator unit. First, the gas is sheared and broken by the turbulence cutting negative pressure component of the micro-nano bubble generator unit, and then enters the jet channel for violent collision, further refining the bubbles.

[0048] In the description of this invention, it should be understood that the terms "center", "inner", "outer", "axial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0051] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0053] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A jet-driven self-aspirating micro / nano bubble generator, characterized in that, The device includes a water inlet connector, a water outlet connector, an air inlet connector, an outer sleeve, and multiple micro / nano bubble generating units. These micro / nano bubble generating units are sequentially joined end-to-end to form a micro / nano bubble generating assembly. The micro / nano bubble generating assembly is fitted and installed within the outer sleeve along its axial direction. The outer walls of the multiple micro / nano bubble generating units are fitted and abut against the inner wall of the outer sleeve, with pre-reserved interconnected air inlet spaces. The inner wall of the micro / nano bubble generating assembly forms a jet channel. Air inlet holes are formed on the side walls of the multiple micro / nano bubble generating units, connecting the air inlet spaces to the jet channel. The water inlet connector and water outlet connector are respectively installed at both ends of the outer sleeve and are respectively connected to the jet channel. The air inlet connector is installed on the outer wall of the outer sleeve and is connected to the air inlet space. A tapered channel is provided on the inner wall of the outer sleeve near the water inlet connector.

2. The jet-driven self-aspirating micro / nano bubble generator according to claim 1, characterized in that, The micro / nano bubble generator has a ring-shaped structure. Multiple outer annular steps are formed on the outer wall of the micro / nano bubble generator along its axial direction, and multiple inner annular steps are formed on the inner wall of the micro / nano bubble generator along its axial direction. The outer diameter of the outer annular step and the inner diameter of the inner annular step gradually decrease along the water inlet direction, so that the two ends of the micro / nano bubble generator along its axial direction are respectively formed as a large end and a small end. The small end of one micro / nano bubble generator is adapted to be inserted into the inner side of the large end of an adjacent micro / nano bubble generator, and an air inlet cavity is formed by the cooperation of the outer and inner annular steps. The air inlets of the two adapted micro / nano bubble generators are both connected to the air inlet cavity.

3. The jet self-aspiration micro / nano bubble generator according to claim 2, characterized in that, In the two micro-nano bubble generators that form the air intake cavity, the larger end of the outer side of the air intake cavity is provided with a first air intake hole that communicates with the air intake cavity, and the smaller end of the inner side of the air intake cavity is provided with a second air intake hole that communicates with the air intake cavity.

4. The jet self-aspiration micro / nano bubble generator according to claim 3, characterized in that, The diameter of the first air inlet on the same micro / nano bubble generating monomer is larger than that of the second air inlet. The first and second air inlets, which are connected to the same air inlet chamber, are of equal size and are staggered in the axial direction of the micro / nano bubble generating monomer.

5. The jet-driven self-aspirating micro / nano bubble generator according to claim 3, characterized in that, The plurality of outer annular steps include a first outer annular step, a second outer annular step, and a third outer annular step arranged sequentially with gradually decreasing outer diameter of the step wall. A first air inlet hole is formed on the step wall of the first outer annular step, and a second air inlet hole is formed on the step wall of the third outer annular step. The first air inlet hole is located near the larger end of the step wall, and the second air inlet hole is located away from the smaller end of the step wall.

6. The jet-driven self-aspirating micro / nano bubble generator according to claim 5, characterized in that, The plurality of outer annular steps also include a fourth outer annular step, which is located on the step wall of the first outer annular step, and a ring of the first air inlets is located at one end of the step wall near the step surface of the fourth outer annular step.

7. The jet-driven self-aspirating micro / nano bubble generator according to claim 6, characterized in that, The step wall of the fourth outer annular step is adapted to abut against the outer sleeve. Multiple air inlet grooves are provided on the inner side wall of the outer sleeve. The air inlet grooves extend in a direction parallel to the central axis of the outer sleeve and are used to connect all the micro-nano bubble generators with the air inlet space formed between the outer sleeve and the outer sleeve.

8. A jet-driven self-aspirating micro / nano bubble generator according to any one of claims 3 to 7, characterized in that, In the multi-level inner annular steps, a turbulence structure is formed on the step wall of the inner annular step with the smallest inner diameter; the turbulence structure includes multiple triangular teeth evenly arranged circumferentially along the micro-nano bubble generating monomer, the cross-section of the multiple triangular teeth is triangular, the triangular teeth extend along the direction parallel to the central axis of the micro-nano bubble generating monomer, and a turbulence groove is formed between two adjacent triangular teeth, the two ends of the turbulence groove respectively penetrating the step surface of the inner annular step and the small end face of the micro-nano bubble generating monomer.

9. A jet-driven self-aspirating micro / nano bubble generator according to any one of claims 2 to 7, characterized in that, It also includes a limiting cylinder, one end of which is adapted to be connected to the large end of the micro-nano bubble generating monomer at the beginning, and the other end of which is adapted to be connected to the water inlet connector. The limiting cylinder forms the tapered channel, the inner diameter of which gradually decreases along the water inlet direction, and the inner diameter of the small end of the tapered channel is the same as the inner diameter of the small end of the micro-nano bubble generating monomer.

10. The jet-driven self-aspirating micro / nano bubble generator according to claim 9, characterized in that, It also includes a first limiting plate and a second limiting plate. The first limiting plate is located between the limiting cylinder and the water inlet connector, and the second limiting plate is located between the tail end micro-nano bubble generating monomer and the water outlet connector. A square water inlet hole is opened in the middle of the first limiting plate, and a square water outlet hole is opened in the middle of the second limiting plate.

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