Micro-nano bubble generating structure, generating assembly and generating device

Abstract

The utility model relates to a kind of micro-nano bubble generating structure, generating assembly and generating device, micro-nano bubble generating structure includes structure ring, and multiple levels outer annular steps are set on the outside wall of structure ring along its axial direction, and the two ends of structure ring axial are formed into large end and small end respectively by multiple levels outer annular steps, wherein the step wall of two outer annular steps is respectively set with a circle of first air inlet and a circle of second air inlet, and first air inlet and second air inlet are all communicated with the inner cavity of structure ring, and there is at least one outer annular step between first air inlet and second air inlet, and the outer diameter of the step wall where first air inlet is located is greater than the outer diameter of the step wall where second air inlet is located, and the aperture of first air inlet is greater than the aperture of second air inlet. By setting multiple levels outer annular steps on structure ring, the mutual butt joint between structure ring is facilitated, the circulation path of gas is increased, and micro-nano bubble is formed.

Description

Technical Field

[0001] This utility model relates to the technical field of bubble generators, specifically to a micro / nano bubble generating structure, generating components, and generating device. 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. Utility Model Content

[0005] In order to solve one or more technical problems existing in the prior art, this utility model provides a micro / nano bubble generating structure, generating components and generating device.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: This utility model provides a micro-nano bubble generating structure, including a structural ring. Multiple outer annular steps are formed on the outer wall of the structural ring along its own axial direction. The multiple outer annular steps form a large end and a small end at the two ends of the structural ring along its axial direction, respectively. A first air inlet hole and a second air inlet hole are respectively formed on the step walls of two of the outer annular steps. Both the first and second air inlets are connected to the inner cavity of the structural ring. At least one outer annular step is spaced between the first and second air inlets. The outer diameter of the step wall where the first air inlet hole is located is larger than the outer diameter of the step wall where the second air inlet hole is located, and the diameter of the first air inlet hole is larger than the diameter of the second air inlet hole.

[0007] The beneficial effects of this utility model are: the micro-nano bubble generating structure of this utility model, by setting multiple outer annular steps on the structural ring, facilitates the connection between the structural rings, and by setting the first air inlet and the second air inlet, facilitates air intake, increases the gas flow path, and facilitates the formation of micro-nano bubbles.

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

[0009] 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 in sequence. 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.

[0010] 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.

[0011] The beneficial effect of adopting the above-mentioned further solution is that by setting the fourth outer annular step, it is convenient to adapt and abut with the outer sleeve, and to facilitate the overall assembly.

[0012] Furthermore, the inner wall of the structural ring is provided with multiple inner annular steps along its own axial direction. The outer diameter of the step wall of the multiple outer annular steps and the inner diameter of the step wall of the multiple inner annular steps gradually decrease along the water inlet direction. Among the multiple inner annular steps, a turbulence structure is provided on the step wall of the inner annular step with the smallest inner diameter.

[0013] Furthermore, the inner annular step includes a first inner annular step and a second inner annular step arranged sequentially with gradually decreasing inner diameters. The first air inlet is located between the step surface of the first inner annular step and the large end of the structural ring, and the second air inlet penetrates the turbulence structure arrangement.

[0014] Furthermore, the turbulence structure includes multiple triangular teeth evenly arranged along the circumference of the structural ring. The cross-section of the multiple triangular teeth is triangular. The triangular teeth extend in a direction parallel to the central axis of the structural ring. 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 structural ring.

[0015] This utility model also provides a micro / nano bubble generating component, including multiple micro / nano bubble generating structures as described above. The multiple structural rings are coaxially connected end to end in sequence. The small end of one structural ring is inserted into the inner side of the large end of another structural ring and forms an air inlet cavity between it and the inner sidewall of the large end. The second air inlet hole of one structural ring is connected to the air inlet cavity, and the first air inlet hole of another structural ring is connected to the air inlet cavity. The first air inlet hole and the second air inlet hole connected to the same air inlet cavity are of equal size and are staggered in the axial direction of the structural ring.

[0016] The beneficial effects of this utility model are as follows: The micro-nano bubble generating component of this utility model is composed of multiple structural rings. Each unit performs gas-liquid mixing at its own stage, which also further refines the gas of the previous stage. The pore size of each stage of the multiple structural rings gradually decreases along the water flow direction. The second air inlet of the unit at this stage is equal in size to the first air inlet of the unit at the previous stage and is staggered. With such a multi-stage design, a large number of micro-nano-scale bubbles can be stably generated.

[0017] Furthermore, it also includes a limiting cylinder, one end of which is adapted to be connected to the large end of the first end structural ring, and the other end of which is adapted to be connected to the water inlet connector. The limiting cylinder forms the tapering channel, the inner diameter of which gradually decreases along the water inlet direction, and the inner diameter of the small end of the tapering channel is the same as the inner diameter of the small end of the structural ring.

[0018] This utility model also provides a micro / nano bubble generating device, including a micro / nano bubble generating component as described above, and further including a water inlet connector, a water outlet connector, an air inlet connector, and an outer sleeve. The micro / nano bubble generating component is installed inside the outer sleeve along its axial direction. The outer side wall of the micro / nano bubble generating component is adapted to and abuts against the inner side wall of the outer sleeve and has reserved an air inlet space that is interconnected. The inner side wall of the micro / nano bubble generating component forms a 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 water inlet connector is arranged near the large end of the first end structure of the micro / nano bubble generating component, and the water outlet connector is arranged near the small end of the tail end structure of the micro / nano bubble generating component. The air inlet connector is installed on the outer side wall of the outer sleeve and is connected to the air inlet space. The air inlet space is connected to the jet channel through the first air inlet hole, the air inlet chamber, and the second air inlet hole. A tapered channel is provided on the inner side wall of the outer sleeve near the water inlet connector.

[0019] The beneficial effects of this utility model are as follows: The self-aspirating micro-nano bubble generator of this utility model, by setting a gradually narrowing channel, allows water to be drawn into the micro-nano bubble generator through the water pump. The water first enters the interior of the micro-nano bubble generator through the gradually narrowing channel, where the internal velocity increases to generate 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 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.

[0020] Furthermore, the inner wall of the outer sleeve is provided with a plurality of air inlet grooves, which extend in a direction parallel to the central axis of the outer sleeve and are used to connect the air inlet spaces formed between all the structural rings and the outer sleeve.

[0021] 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.

[0022] When the micro-nano bubble generator of this utility model is used, the process of generating jet-type 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 vigorous mixing of gas and liquid, 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.

[0023] The various components of this invention are highly adjustable and can meet different usage requirements. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the micro / nano bubble generating structure of this utility model. Figure 1; Figure 2 This is a three-dimensional structural diagram of the micro / nano bubble generating structure of this utility model. Figure 2 ; Figure 3 This is a three-dimensional structural diagram of the micro / nano bubble generating structure of this utility model. Figure 3 ; Figure 4 This is a side view of the micro / nano bubble generating structure of this utility model; Figure 5 This is a three-dimensional structural diagram of the micro / nano bubble generating component of this utility model; Figure 6 This is a side view of the micro / nano bubble generating component of this utility model. 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 this utility model; Figure 10 This is a schematic diagram of the main structure of the micro / nano bubble generator of this utility model; Figure 11 for Figure 10 Schematic diagram of the cross-sectional structure of BB; Figure 12 for Figure 10 A cross-sectional view of the CC structure.

[0025] The attached diagram lists the components represented by each number as follows: 100. Structural ring; 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. Turbidity 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; 505, Air inlet slot. Detailed Implementation

[0026] The principles and features of this utility model are described below. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0027] Example 1 like Figures 1-4 As shown, a micro / nano bubble generating structure of this embodiment includes a structural ring 100. Multiple outer annular steps are formed on the outer wall of the structural ring 100 along its axial direction. These multiple outer annular steps form a large end and a small end at the two ends of the structural ring 100 along its axial direction, respectively. A first air inlet 102 and a second air inlet 103 are 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 communicate with the inner cavity of the structural ring 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 containing the first air inlet 102 is larger than the outer diameter of the step wall containing the second air inlet 103, and the diameter of the first air inlet 102 is larger than the diameter of the second air inlet 103.

[0028] The micro-nano bubble generating structure of this embodiment facilitates the interconnection between structural rings by setting multiple outer annular steps on the structural rings, and facilitates air intake and increases the gas flow path by setting a first air inlet and a second air inlet, which is conducive to the formation of micro-nano bubbles.

[0029] Example 2 Based on Embodiment 1, this embodiment provides a specific structure of the structural ring 100. For example... Figures 1-4 As shown, the plurality of outer annular steps in this embodiment include a first outer annular step 104, a second outer annular step 105, and a third outer annular step 106 arranged sequentially. A first air inlet hole 102 is formed on the step wall of the first outer annular step 104, and a second air inlet hole 103 is formed on the step wall of the third outer annular step 106. The first air inlet hole 102 is located on the step wall near the large end 111, and the second air inlet hole 103 is located on the step wall away from the small end 112.

[0030] Preferably, the plurality of outer annular steps further includes a fourth outer annular step 107, which is located on the step wall of the first outer annular step 104, and a ring of the first air inlets 102 is located at one end of the step wall near the step surface of the fourth outer annular step 107. By providing the fourth outer annular step, it is convenient to fit and engage with the outer sleeve, and to facilitate overall assembly.

[0031] Example 3 Based on Embodiment 1 or Embodiment 2, this embodiment provides a specific structure of the structural ring 100. For example... Figures 1-4As shown, in this embodiment, the inner wall of the structural ring 100 has multiple inner annular steps along its own axial direction. The outer diameter of the step wall of the multiple outer annular steps and the inner diameter of the step wall of the multiple inner annular steps gradually decrease along the water inlet direction. Among the multiple inner annular steps, a turbulence structure is formed on the step wall of the inner annular step with the smallest inner diameter.

[0032] like Figures 1-3 As shown, the inner annular step in this embodiment includes a first inner annular step 108 and a second inner annular step 109 arranged sequentially with gradually decreasing inner diameters. The first air inlet 102 is located between the step surface of the first inner annular step 108 and the large end 111 of the structural ring 100. The second air inlet 103 is arranged through the turbulence structure 110.

[0033] like Figure 1 and Figure 3 As shown, specifically, the turbulence structure 110 includes a plurality of triangular teeth evenly arranged along the circumference of the structure ring. The cross-section of the plurality of triangular teeth is triangular. The triangular teeth extend in a direction parallel to the central axis of the structure ring 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 structure ring 100.

[0034] Example 4 like Figures 5-8 As shown, this embodiment provides a micro / nano bubble generating component, including multiple micro / nano bubble generating structures as described above. Multiple structural rings 100 are sequentially and coaxially connected end to end. The small end 112 of one structural ring 100 is inserted into the inner side of the large end 111 of another structural ring 100, forming an air inlet cavity 113 between the small end 112 and the inner sidewall of the large end 111. The second air inlet hole 103 of one structural ring 100 communicates with the air inlet cavity 113, and the first air inlet hole 102 of another structural ring 100 communicates with the air inlet cavity 113. The first air inlet hole 102 and the second air inlet hole 103 communicating with the same air inlet cavity 113 are of equal size and are staggered in the axial direction of the structural ring 100.

[0035] Except for the two structural rings 100 at the beginning and end, each of the other two outer annular steps of the structural rings 100 has a first air inlet 102 and a second air inlet 103 respectively. The first air inlet 102 and the second air inlet 103 are both connected to the inner cavity of the structural ring 100. There is at least one outer annular step between the first air inlet 102 and the second air inlet 103. The outer diameter of the step wall where the first air inlet 102 is located is larger than the outer diameter of the step wall where the second air inlet 103 is located. A second air inlet 103 is provided on one structural ring 100 at the beginning, and a first air inlet 102 is provided on one structural ring 100 at the end. In two adjacent structural rings 100, the second air inlet 103 of one structural ring 100 is connected to the air inlet cavity 113, and the first air inlet 102 of the other structural ring 100 is connected to the air inlet cavity 113. There is an outer annular step between the first air inlet 102 and the second air inlet 103.

[0036] like Figures 5-8 , Figure 11 As shown, the micro-nano bubble generating component 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 end structural ring, 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 the tapered channel, and the inner diameter of the tapered channel gradually decreases along the water inlet direction. The inner diameter of the small end 112 of the tapered channel is the same as the inner diameter of the small end 112 of the structural ring 100.

[0037] Specifically, one end of the outer wall of the limiting cylinder 501 has an outer annular step with the same structure as the structural ring 100. However, the limiting cylinder 501 does not need to form an air inlet cavity 113 with the adjacent structural ring 100; it only needs to be in close contact. The outer wall of the structural ring 100 adjacent to the water outlet connector 300 does not need to have an outer annular step structure; it only needs to have an inner annular step structure identical to the other structural rings 100, so as to form an air inlet cavity 113 with the outer annular step of the adjacent structural ring 100. Specifically, as shown... Figure 11 As shown.

[0038] Specifically, when the multiple structural rings 100 in this embodiment 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 structural ring 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.

[0039] 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.

[0040] The micro-nano bubble generating component of this embodiment consists of multiple structural rings. Each unit performs gas-liquid mixing at its own stage, which also further refines the gas from the previous stage. The pore size of each of the multiple structural rings gradually decreases along the water flow direction. The second air inlet of the unit at this stage is the same size as the first air inlet of the unit at the previous stage and is staggered. This multi-stage design can stably generate a large number of micro-nano bubbles.

[0041] Example 5 like Figures 9-12As shown, this embodiment provides a micro / nano bubble generating device, including a micro / nano bubble generating component as described in Embodiment 4, and further including a water inlet connector 200, a water outlet connector 300, an air inlet connector 400, and an outer sleeve 500. The micro / nano bubble generating component is installed inside the outer sleeve 500 along the axial direction of the outer sleeve 500. The outer wall of the micro / nano bubble generating component is adapted to and abuts against the inner wall of the outer sleeve 500 and has reserved an air inlet space that is interconnected. The inner wall of the micro / nano bubble generating component forms a jet channel 101. The water inlet connector 200 and the water outlet connector 300 are respectively installed in the outer sleeve 500. Both ends are connected to the jet channel 101. The water inlet connector 200 is arranged near the large end 111 of the first end structure of the micro-nano bubble generating component, and the water outlet connector 300 is arranged near the small end 112 of the tail end structure of the micro-nano bubble generating component. The air inlet connector 400 is installed on the outer wall of the outer sleeve 500 and is connected to the air inlet space. The air inlet space is connected to the jet channel 101 through the first air inlet hole 102, the air inlet chamber 113 and the second air inlet hole 103. A tapered channel is provided on the inner side wall of the outer sleeve 500 near the water inlet connector 200.

[0042] like Figure 12 As shown, in one specific embodiment, a plurality of air intake grooves 505 are provided on the inner sidewall of the outer sleeve 500. The air intake grooves 505 extend in a direction parallel to the central axis of the outer sleeve 500 and are used to connect the air intake spaces formed between all the structural rings 100 and the outer sleeve 500. By providing air intake grooves, it is convenient to connect all the air intake spaces.

[0043] 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.

[0044] 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.

[0045] In the description of this utility model, it should be understood that the terms "center", "inner", "outer", "axial", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0046] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0047] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," 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 utility model according to the specific circumstances.

[0048] In this utility model, 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," "on top of," and "over" 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.

[0049] 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.

[0050] 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 micro / nano bubble generating structure, characterized in that, The structure includes a structural ring, on the outer wall of which multiple outer annular steps are formed along its own axial direction. The multiple outer annular steps form a large end and a small end at the two ends of the structural ring along its axial direction, respectively. A first air inlet hole and a second air inlet hole are respectively formed on the step wall of two outer annular steps. Both the first air inlet hole and the second air inlet hole are connected to the inner cavity of the structural ring. There is at least one outer annular step between the first air inlet hole and the second air inlet hole. The outer diameter of the step wall where the first air inlet hole is located is larger than the outer diameter of the step wall where the second air inlet hole is located, and the diameter of the first air inlet hole is larger than the diameter of the second air inlet hole.

2. The micro / nano bubble generating structure according to claim 1, 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 in sequence. 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.

3. The micro / nano bubble generating structure according to claim 2, 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.

4. The micro / nano bubble generating structure according to any one of claims 1 to 3, characterized in that, Multiple inner annular steps are formed on the inner sidewall of the structure ring along its own axial direction. The outer diameter of the step wall of the multiple outer annular steps and the inner diameter of the step wall of the multiple inner annular steps gradually decrease along the water inlet direction. Among the multiple inner annular steps, a turbulence structure is formed on the step wall of the inner annular step with the smallest inner diameter.

5. The micro / nano bubble generating structure according to claim 4, characterized in that, The multi-level inner annular steps include a first inner annular step and a second inner annular step arranged sequentially with gradually decreasing inner diameters. The first air inlet is located between the step surface of the first inner annular step and the large end of the structural ring, and the second air inlet penetrates the turbulence structure arrangement.

6. The micro / nano bubble generating structure according to claim 4, characterized in that, The turbulence structure includes multiple triangular teeth evenly arranged along the circumference of the structure ring. The cross-section of the multiple triangular teeth is triangular. The triangular teeth extend in a direction parallel to the central axis of the structure ring. A turbulence groove is formed between two adjacent triangular teeth. The two ends of the turbulence groove pass through the step surface of the inner annular step and the small end face of the structure ring, respectively.

7. A micro / nano bubble generating component, characterized in that, The structure includes multiple micro / nano bubble generating structures as described in any one of claims 1 to 6, wherein multiple structural rings are sequentially and coaxially connected end to end, the small end of one structural ring is inserted into the inner side of the large end of another structural ring and forms an air inlet cavity between the small end and the inner sidewall of the large end, the second air inlet of one structural ring communicates with the air inlet cavity, the first air inlet of another structural ring communicates with the air inlet cavity, and the first air inlet and the second air inlet communicating with the same air inlet cavity are of equal size and are staggered in the axial direction of the structural rings.

8. The micro / nano bubble generating component according to claim 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 first end structural ring, and the other end of which is adapted to be connected to the water inlet connector. A gradually narrowing channel is formed inside the limiting cylinder, and the inner diameter of the gradually narrowing channel gradually decreases along the water inlet direction. The inner diameter of the small end of the gradually narrowing channel is the same as the inner diameter of the small end of the structural ring.

9. A micro / nano bubble generator, characterized in that, The device includes a micro / nano bubble generating assembly as described in claim 7 or 8, further comprising a water inlet connector, a water outlet connector, an air inlet connector, and an outer sleeve. The micro / nano bubble generating assembly is installed axially within the outer sleeve. The outer sidewall of the micro / nano bubble generating assembly is adapted to and abuts against the inner sidewall of the outer sleeve, and an air inlet space is provided for mutual communication. The inner sidewall of the micro / nano bubble generating assembly forms a 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 water inlet connector is arranged near the large end of the first end structure of the micro / nano bubble generating assembly, and the water outlet connector is arranged near the small end of the tail end structure of the micro / nano bubble generating assembly. The air inlet connector is installed on the outer sidewall of the outer sleeve and is connected to the air inlet space. The air inlet space is connected to the jet channel through the first air inlet hole, the air inlet chamber, and the second air inlet hole. A tapered channel is provided on the inner sidewall of the outer sleeve near the water inlet connector.

10. The micro / nano bubble generator according to claim 9, characterized in that, The inner wall of the outer sleeve is provided with multiple air inlet slots, which extend in a direction parallel to the central axis of the outer sleeve and are used to connect the air inlet spaces formed between all structural rings and the outer sleeve.

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