Microbubble generation switching device

Abstract

The invention discloses a microbubble generation switching device, and belongs to the field of pipeline joints. Comprising a shell; a plurality of water flow channels arranged in parallel and an annular air inlet cavity arranged around the peripheries of the water flow channels are arranged in the shell; the side wall of the shell is further provided with an air inlet connector. The plurality of water flow channels are provided with lower reducing sections of which the sections are gradually reduced along the water flow direction; and a plurality of air inlet branch holes are formed in the side wall of the lower reducing section. The device has the beneficial effects that the design that a plurality of independent water flow channels are connected in parallel is adopted, and the Venturi reducing structures in all the channels are combined, so that remarkable negative pressure areas can be generated at a plurality of point positions at the same time under conventional water pressure, and gas is efficiently sucked in through the carefully-arranged gas inlet branch holes. The sucked gas is synchronously sheared and crushed by multi-channel high-speed water flow, and the gas-liquid contact area in unit volume is obviously increased, so that bubbles which are large in quantity, fine in size and uniform in distribution are generated.

Description

Technical Field

[0001] This application relates to the field of pipe fittings, and more specifically, to a microbubble generating adapter. Background Technology

[0002] Microbubble technology, with its large specific surface area, long-term retention in liquids, and high mass transfer efficiency, has shown broad application prospects in many fields such as water treatment, agricultural oxygenation, industrial cleaning, medical aesthetics, and home care. However, traditional microbubble generators (such as Venturi tubes, impellers, and pressurized dissolved air generators) often have limitations such as complex structure, large size, high energy consumption, or reliance on external high-pressure air sources and water pumps. Especially in household or small-scale, portable applications, users find it difficult to easily integrate microbubble functionality into existing water systems (such as faucets and showerheads), usually requiring the installation of additional specialized equipment, which is costly and inconvenient to operate. Therefore, there is an urgent need for a device that is compact, easy to install, requires no additional power, can be directly connected to existing water supply lines, and can efficiently generate a large number of uniform, fine bubbles under normal water pressure, in order to lower the application threshold of microbubble technology and broaden its application scope. Summary of the Invention

[0003] The summary section of this application is intended to provide a brief overview of the concepts, which will be described in detail in the detailed description section below. This summary section is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.

[0004] To address the technical problems mentioned in the background section, some embodiments of this application provide a microbubble generating adapter, comprising: a housing; a plurality of water flow channels arranged side by side within the housing and an annular air intake chamber surrounding the outer periphery of the water flow channels; an air intake interface is also provided on the side wall of the housing; the annular air intake chamber is connected to the air intake interface; each of the plurality of water flow channels is provided with a lower tapering section whose cross-section gradually decreases along the water flow direction; a plurality of air intake support holes are provided on the side wall of the lower tapering section; each of the plurality of air intake support holes is connected at one end to a corresponding water flow channel and at the other end to the annular air intake chamber.

[0005] Furthermore, the water flow channel includes an upper straight section connected to the lower tapering section, and the inner diameter of the lower tapering section decreases continuously or in stages along the water flow direction.

[0006] Furthermore, the air intake port is located near the rear part of the lower tapering section.

[0007] Furthermore, the plurality of air intake ports are distributed substantially evenly along the circumference of the annular air intake cavity.

[0008] Furthermore, the microbubble generating and transferring device also includes a porous water channel structure; the porous water channel structure forms the water flow channel and the air inlet branch hole; the annular air inlet cavity is jointly defined by the inner wall of the housing and the outer wall of the porous water channel structure, and the annular air inlet cavity is arranged in a closed ring along the circumference.

[0009] Furthermore, the porous water channel structure is detachably connected to the housing.

[0010] Furthermore, the housing has a first connection structure for threaded connection with a faucet or water supply line and a second connection structure for connection with a downstream water pipe or shower head.

[0011] Furthermore, the air intake interface has a third connection structure for threaded connection with an external air source and / or an open intake end.

[0012] Furthermore, the number of the plurality of water flow channels is 4 to 20.

[0013] Furthermore, the shell is integrally formed from metal or engineering plastic, and the porous water channel structure is sintered and / or injection molded from engineering plastic or metal powder.

[0014] The beneficial effects of this application are as follows:

[0015] Employing a parallel design of multiple independent water flow channels, combined with the Venturi tapering structure within each channel, significant negative pressure zones can be simultaneously generated at multiple points under normal water pressure. Gas is then efficiently drawn in through carefully arranged air inlets. The multi-channel high-speed water flow synchronously shears and breaks up the inhaled gas, significantly increasing the gas-liquid contact area per unit volume, thereby generating a large number of finely sized and uniformly distributed bubbles.

[0016] The integrally molded or high-precision manufactured porous water channel structure ensures the consistency of the geometric dimensions of each water flow channel and air inlet branch. Combined with the surrounding annular air inlet chamber and its circumferentially evenly distributed air inlet design, it can effectively ensure the balanced distribution of gas among different water flow channels, avoiding the problem of excessive or insufficient local air intake, and making the output microbubble mixture stable and consistent in performance. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application.

[0018] Furthermore, throughout the accompanying drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the elements are not necessarily drawn to scale.

[0019] In the attached diagram:

[0020] Figure 1 This is an overall schematic diagram based on an embodiment of this application;

[0021] Figure 2 This is a structural schematic diagram of a part of the embodiment, mainly showing a top-down view. Figure 1 The structure;

[0022] Figure 3 This is a structural schematic diagram of a part of the embodiment, mainly showing... Figure 2 sectional structure;

[0023] Figure 4 This is a structural schematic diagram of a part of the embodiment, mainly showing... Figure 1 sectional structure;

[0024] Figure 5 This is a structural schematic diagram of a part of the embodiment, mainly showing the structure of the arc-shaped block;

[0025] Figure 6 This is a structural schematic diagram of a part of the embodiment, mainly showing... Figure 5 The cross-sectional structure.

[0026] Figure label:

[0027] 1. Housing; 11. Mounting cavity; 12. Annular air intake cavity; 13. Air intake interface; 14. Air supply channel;

[0028] 2. Porous water channel structure; 21. Upper straight section; 22. Lower tapering section; 23. Air inlet branch hole;

[0029] 3. Baffle;

[0030] 4. Circular membrane;

[0031] 5. Arc-shaped block; 51. Protrusion; 52. Mounting chamber; 53. Limiting protrusion;

[0032] 6. Storage chamber;

[0033] 7. Contains a cavity. Detailed Implementation

[0034] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0035] It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0036] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0037] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0038] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] Reference Figure 1-6 ,

[0040] A microbubble generating adapter includes a housing 1.

[0041] The housing 1 is generally a hollow cylindrical structure, preferably cylindrical, with an axially formed mounting cavity 11 inside. A porous water channel structure 2 is installed inside the mounting cavity 11 of the housing 1. The porous water channel structure 2 is preferably an integrally formed structure, and its outer contour fits with the inner wall of the mounting cavity 11 of the housing 1 to define an annular air intake cavity 12 surrounding the outer periphery of the porous water channel structure 2. Specifically, the inner wall of the housing 1 and the outer wall of the porous water channel structure 2 form a closed annular cavity in the circumferential direction, which is the annular air intake cavity 12. The annular air intake cavity 12 is continuously arranged in the circumferential direction, and its upper and lower ends are respectively sealed by the abutment of the housing 1 and the porous water channel structure 2 to prevent gas leakage.

[0042] The porous water channel structure 2 has multiple parallel water flow channels inside. In this embodiment, the number of water flow channels is 4 to 20, for example, 6, 8, or 12, to configure a suitable total flow rate and single-channel flow velocity. The multiple water flow channels are arranged axially along the housing 1, extending from the upper surface to the lower surface of the porous water channel structure 2. Each water flow channel includes an upper straight section 21 communicating with the upper surface and a lower tapering section 22 communicating with the lower surface. The upper straight section 21 and the lower tapering section 22 are connected.

[0043] An air inlet 13 is provided on the side wall of the housing 1. The air inlet 13 is preferably a short pipe joint structure that protrudes outward, forming an air supply channel 14 inside. One end of the air supply channel 14 is connected to the annular air inlet chamber 12, and the other end opens to the outside of the housing 1. The upper end of the housing 1 forms a first port, which serves as the water inlet of the device; the lower end of the housing 1 forms a second port, which serves as the water outlet of the device.

[0044] The upper straight section 21 can be a cylindrical through-hole with a constant diameter at different positions, and the cylindrical through-hole smoothly transitions to the water inlet passage at the first port. The lower tapering section 22 gradually narrows its cross-section along the water flow direction. Its inner diameter can decrease continuously or in a stepped shape, thus forming a significant Venturi effect region when water flows through the lower tapering section 22. In this embodiment, the axis of the lower tapering section 22 coincides with the axis of the water flow channel to simplify manufacturing and ensure consistent hydraulic characteristics across all channels.

[0045] Multiple air inlet holes 23 are provided on the side wall of the lower tapering section 22 of each water flow channel. One end of each air inlet hole 23 is connected to the corresponding water flow channel, and the other end is connected to the annular air inlet chamber 12. Preferably, the air inlet holes 23 are located near the rear part of the lower tapering section 22, that is, a section closer to the water outlet end of the lower tapering section 22, so that the water flow area corresponding to the air inlet hole 23 is in a region with a more significant Venturi negative pressure, which is beneficial to improving the gas intake capacity and the bubble refinement effect.

[0046] To ensure that multiple water flow channels can draw in gas evenly, multiple air inlet branches 23 are evenly distributed along the circumference of the annular air inlet chamber 12. Specifically, the air inlet branches 23 of different water flow channels can be arranged in a staggered or symmetrical manner in the circumference to avoid the situation where the local air volume is too concentrated, resulting in some channels having excessive air intake and others having insufficient air intake, thus achieving a balanced distribution of gas among the various water flow channels.

[0047] In this embodiment, the shell 1 can be made of metal materials, such as stainless steel or brass, or engineering plastic materials, such as POM, PA, or PPS, integrally molded, possessing sufficient mechanical strength and corrosion resistance. The porous water channel structure 2 can be manufactured by injection molding of engineering plastics or by sintering of metal powder, improving the processing accuracy of the water flow channels and air inlet branches 23, ensuring the geometric dimensions and positional accuracy of each channel, thereby facilitating the stable control of microbubble size distribution.

[0048] In some embodiments, the porous water channel structure 2 is detachably connected to the housing 1. For example, a stepped shoulder or internal thread structure can be provided in the mounting cavity 11 of the housing 1, and a matching positioning step or external thread structure can be provided on the outer periphery of the porous water channel structure 2. The porous water channel structure 2 is fixed inside the housing 1 by means of threaded insertion, snap locking, or pressure ring fixation. With this detachable connection method, users or maintenance personnel can disassemble the porous water channel structure 2 after long-term use of the device to clean the internal water flow channels and air inlet branches 23, removing any scale or impurities that may adhere to them, thereby ensuring the long-term stability of the microbubble generation effect.

[0049] A first connection structure is provided at the first port for threaded connection to a faucet or water supply pipe; a second connection structure is provided at the second port for connection to a downstream water pipe or shower head. In this embodiment, the first connection structure can be an internal thread structure, and the second connection structure can be an external thread structure to adapt to common household or engineering water pipe interface standards. In other embodiments, the first and / or second connection structures can also adopt snap-fit, quick-connect, or flange connections. A third connection structure is provided on the air inlet 13, which can be an internal thread structure for threaded connection to the air pipe of an external air source; when not connected to an external air source, the outer end of the air inlet 13 can be directly open to communicate with the atmospheric environment to achieve self-drawing air.

[0050] In use, the first connecting structure is threaded to a faucet or upstream water supply pipe, and the second connecting structure is connected to a downstream water pipe or shower head. If necessary, the air inlet 13 can be connected to an external air source pipe via the third connecting structure, or the air inlet 13 can be left exposed to the ambient atmosphere. When the upstream water supply is turned on, water flows through the first port into the interior of the housing 1 and into the multiple water channels of the porous water passage structure 2.

[0051] The water flow first passes through the upper straight section 21, where the flow velocity is relatively low and the pressure change is minimal. It then enters the lower tapering section 22, where the cross-sectional area gradually decreases, significantly increasing the water velocity and reducing the static pressure, creating a Venturi effect region within the lower tapering section 22. Since the lower tapering section 22 is connected to the annular air intake chamber 12 via air intake branches 23, the gas within the annular air intake chamber 12 is drawn into the corresponding water flow channel under the influence of the pressure difference. The gas is dispersed into fine streams through multiple air intake branches 23 and continuously broken up by the shearing and turbulence of the high-speed water flow, thus forming a large number of microbubbles in the downstream region of the water flow.

[0052] When the air inlet 13 is open to ambient air, the annular air inlet chamber 12 is mainly filled with air, enabling the device to self-absorb air and form an air-water mixture rich in microbubbles in the effluent. When the air inlet 13 is connected to an external gas source, such as a carbon dioxide cylinder, nitrogen cylinder, or other gas supply system, the corresponding gas is drawn in and fully mixed with water, which can be used for water treatment, dissolved oxygen or dissolved carbon dioxide, beauty cleaning, or other green and low-carbon applications.

[0053] Through the above structural design, the microbubble generating and transferring device of this embodiment can achieve a large gas-liquid contact interface area per unit volume under relatively low water supply pressure conditions. This is achieved through the combined action of the multi-channel parallel lower tapering section 22 and multiple air inlet branches 23, thereby significantly increasing the number and refinement of microbubbles. Simultaneously, the circumferentially uniform arrangement of the annular air inlet chamber 12 and the overall high-precision molding of the porous water channel structure 2 ensure relatively balanced gas-liquid mixing between each water flow channel, which is beneficial for obtaining a stable and consistent microbubble output effect.

[0054] Example 2

[0055] This embodiment has the same basic structure as Embodiment 1, except that the porous water channel structure 2 and the shell 1 are integrated into one design.

[0056] In this embodiment, the porous water channel structure 2 and the shell 1 can be manufactured as a single piece, for example, through integral injection molding, integral die casting, or integral metal processing. In this case, the inner and outer walls defining the annular air intake chamber 12 can be formed from different parts of the single structure. Compared to Embodiment 1, this structure further reduces assembly steps, lowers manufacturing and assembly costs, and avoids sealing problems caused by assembly tolerances.

[0057] Since the porous water channel structure 2 is integrally formed with the shell 1, the sealing performance of the annular air inlet chamber 12 can be guaranteed by the manufacturing process itself. The relative position of the air inlet branch hole 23 and the water flow channel is also easier to maintain the design value, which is conducive to further improving the stability and consistency of gas-liquid mixing.

[0058] Example 3

[0059] Example 3 is a further improvement on Example 1 and Example 2. The difference is that the specific structural form of the first connection structure and its matching method with the shell 1 are further optimized to improve the adaptive sealing connection capability and connection reliability with faucets and water pipes of different specifications.

[0060] The first connecting structure in this embodiment includes: a baffle 3, an annular membrane 4, and an arc-shaped block 5 that can slidably engage with the housing 1. At least one slot is provided on the side wall of the housing 1 along its circumference, the slot penetrating the wall thickness of the housing 1. The arc-shaped block 5 is slidably disposed in the slot, and the arc-shaped block 5 and the slot are in a sliding fit or clearance fit to ensure that the arc-shaped block 5 can reciprocate relative to the housing 1 in the radial direction.

[0061] The annular membrane 4 is made of a flexible material with elasticity and a certain degree of plasticity, such as silicone rubber, fluororubber, or other elastomer materials suitable for use with magnetorheological fluids. The annular membrane 4 has an overall annular structure. One end (i.e., one periphery) of the annular membrane 4 is fixed to the inner wall of the housing 1, and the other end (i.e., the opposite periphery) is fixed to the baffle 3, so that the annular membrane 4 has a tensioned or slightly bulging annular structure between the housing 1 and the baffle 3. The baffle 3 is fixedly connected to the inner wall of the housing 1, preferably an annular or disc-shaped structure arranged perpendicular to the axis of the housing 1, to provide support for the annular membrane 4 and form a relatively closed cavity boundary.

[0062] An arc-shaped block 5 is disposed in the slot and is radially slidable relative to the housing 1. Two circumferentially spaced protrusions 51 are formed on the arc-shaped block 5, and each protrusion 51 is fixedly connected to the middle section (i.e., the non-end region) of the annular membrane 4. Through the fixed engagement of the two protrusions 51 with the annular membrane 4, a deformable region is formed between the two protrusions 51, which can bulge outwards towards the axis of the housing 1 or towards the faucet / pipe.

[0063] Based on the above structure, this embodiment defines a storage chamber 6 by means of an arc-shaped block 5, two protrusions 51, and an annular membrane 4. Specifically, a portion of the annular membrane 4 and the surface of the arc-shaped block 5 enclose each other to form the storage chamber 6, which is filled with magnetorheological fluid. Depending on the operating conditions, the initial filling amount of magnetorheological fluid in the storage chamber 6 is preferably such that the annular membrane 4 between the two protrusions 51 bulges outward in the absence of external force and magnetic field, thereby facilitating engagement with the external threads of the connected threaded faucet or water pipe during use.

[0064] In addition, an installation cavity 11 is provided inside the arc-shaped block 5, and an energized coil is installed in the installation cavity 11. The energized coil can be electrically connected to an external power source through a wire. When the energized coil is energized, a magnetic field can be generated in the storage cavity 6 and its adjacent area, thereby applying a magnetic field to the magnetorheological fluid in the storage cavity 6, causing the magnetorheological fluid to change from a fluid state to a state similar to a solid or a high-viscosity semi-solid state, thus achieving "locking" of the shape and position of the annular membrane 4.

[0065] The outer portion of the arc-shaped block 5 protrudes outward from the slot relative to the housing 1. Specifically, a part of the arc-shaped block 5 extends beyond the slot, thus positioning this part outside the housing 1. This exposed portion allows the user to press or push the arc-shaped block 5 with their fingers during installation, disassembly, or adjustment, causing it to move radially inward into the housing 1. To prevent the arc-shaped block 5 from being completely pulled out of the slot or thrown out under significant internal pressure or impact, a limiting protrusion 53 is provided on the side of the arc-shaped block 5 located inside the housing 1. The limiting protrusion 53 abuts against the inner wall of the slot or the inner wall of the housing 1 to form a mechanical limiting structure. When the arc-shaped block 5 moves outward, the limiting protrusion 53 abuts against the limiting portion inside the housing 1, thereby preventing the arc-shaped block 5 from detaching from the slot.

[0066] In practical use, the end of the faucet or water pipe to be connected can be placed inside the housing 1, in the area corresponding to the arc-shaped block 5. Preferably, the outer surface of the faucet or water pipe is provided with external threads. The user presses the exposed part of the arc-shaped block 5 with his finger or a tool outside the housing 1. Under the action of external force, the arc-shaped block 5 slides radially inward, causing the two protrusions 51 on the arc-shaped block 5 to drive the connected annular membrane 4 to move radially inward and retract, so that the inner surface of the annular membrane 4 gradually approaches and covers the outer surface of the faucet or water pipe.

[0067] When the annular membrane 4 is pressed and effectively wrapped around the faucet or water pipe by the arc-shaped block 5, the energized coil is activated, generating a magnetic field. The magnetic field acts on the magnetorheological fluid pre-filled in the storage chamber 6, causing the magnetorheological fluid to rapidly change from a low-viscosity fluid state to a high-viscosity or near-solid state. Because the annular membrane 4 has a certain degree of elasticity and has been partially embedded into the thread groove of the external thread of the faucet or water pipe during the process of being pressed by external force, after the magnetorheological fluid solidifies, the annular membrane 4, supported by the solidified magnetorheological fluid, is equivalent to forming an "internal thread protrusion structure" that perfectly matches the thread of the faucet or water pipe. This allows for radial engagement with the external thread, achieving adaptive connection and fixation for faucets and water pipes of various sizes, pitches, or thread profiles.

[0068] To further improve sealing and adaptability, preferably, the storage chamber 6 is filled with a larger amount of magnetorheological fluid, so that the annular membrane 4 naturally bulges outward between the two protrusions 51. When the arc-shaped block 5 is pressed without applying a magnetic field, the annular membrane 4 can fully deform under the flow of the magnetorheological fluid to fit into the faucet or water pipe, and its initial outward bulging shape makes it easier to "flow" into the threaded grooves of the faucet or water pipe during the pressing process, thereby further improving the reliability of thread engagement and sealing performance.

[0069] In addition, the two protrusions 51 are connected to the non-end positions of the annular membrane 4. The two protrusions 51, the inner wall of the housing 1, and the annular membrane 4 together form two receiving chambers 7. The receiving chambers 7 are filled with magnetorheological fluid. After the arc-shaped block 5 is subjected to external pressure, the annular membrane 4 wraps tightly around the faucet and water pipe, and the magnetorheological fluid in the two receiving chambers 7 solidifies, thereby forming a stable solid that supports the limiting protrusion 53. The solidified magnetorheological fluid support supports the annular membrane 4 from the inside out, locking its relative position with the faucet or water pipe and preventing the annular membrane 4 from rebounding. On the other hand, the supporting force is transmitted to the limiting protrusion 53 on the inner side of the arc-shaped block 5 through the annular membrane 4 and the protrusions 51, so that the limiting protrusion 53 is firmly abutted against the limiting surface of the inner wall of the housing 1, thereby keeping the arc-shaped block 5 in the radially inward position formed when it is pressed, that is, maintaining its working state of pressing the water pipe or faucet. In this way, even if external pressure is no longer continuously applied, the arc-shaped block 5 can still be maintained in the locked position by the solidified magnetorheological fluid, ensuring the stability and reliability of the connection.

[0070] When disconnection is required, the power supply to the energized coil can be cut off, causing the magnetic field to disappear. The magnetorheological fluid in the storage chamber 6 and each containing chamber 7 will return to its original flow state or low viscosity state. As a result, the annular membrane 4 will return to its more natural initial shape under the action of its own elasticity and the reverse force on the outer surface of the faucet / pipe. At this time, the user can gently press or pull the arc-shaped block 5 to move it outward within the groove, relieving the radial compression on the faucet or pipe, making it easier to remove the faucet or pipe from the housing 1, achieving the effect of reusability and quick assembly / disassembly.

[0071] To further improve the overall sealing performance and connection reliability, in this embodiment, multiple arc-shaped blocks 5 with the same or similar structures can be arranged around the circumference of the housing 1. These multiple arc-shaped blocks 5 are spaced apart along the circumference of the housing 1, allowing the corresponding local areas of the annular membrane 4 on the multiple arc-shaped blocks 5 to simultaneously wrap and clamp the faucet or water pipe from multiple directions in the radial direction. This creates a multi-point, multi-area tight contact between the annular membrane 4 and the water pipe / faucet, which is beneficial for improving sealing performance and connection strength, and gives the overall structure a stronger adaptive compensation capability for eccentricity or processing errors in different directions of the faucet or water pipe.

[0072] The above description is merely a selection of preferred embodiments of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in the embodiments of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in the embodiments of this disclosure.

Claims

1. A microbubble generating adapter, characterized in that, include: The housing includes a plurality of water flow channels arranged side by side and an annular air intake chamber surrounding the outer periphery of the water flow channels. An air inlet is also provided on the side wall of the housing; the annular air inlet cavity is connected to the air inlet. Each of the multiple water flow channels is provided with a lower tapering section whose cross-section gradually decreases along the water flow direction; multiple air inlet holes are provided on the side wall of the lower tapering section; each of the multiple air inlet holes is connected at one end to the corresponding water flow channel and at the other end to the annular air inlet cavity.

2. The microbubble generating adapter according to claim 1, characterized in that: The water flow channel includes an upper straight section connected to the lower tapering section, and the inner diameter of the lower tapering section decreases continuously or in stages along the water flow direction.

3. The microbubble generating adapter according to claim 2, characterized in that: The air intake port is located near the middle and rear of the lower tapering section.

4. The microbubble generating adapter according to claim 1, characterized in that: The multiple air intake ports are distributed substantially evenly along the circumference of the annular air intake cavity.

5. The microbubble generating adapter according to claim 4, characterized in that: The microbubble generating and transferring device also includes a porous water channel structure; the porous water channel structure forms the water flow channel and the air inlet branch hole. The annular air intake cavity is defined by the inner wall of the housing and the outer wall of the porous water channel structure, and the annular air intake cavity is arranged in a closed ring along the circumference.

6. The microbubble generating adapter according to claim 1, characterized in that: The porous water channel structure is detachably connected to the housing.

7. The microbubble generating adapter according to claim 1, characterized in that: The housing has a first connection structure for connecting to a faucet or water supply line and a second connection structure for connecting to a downstream water pipe or shower head.

8. The microbubble generating adapter according to claim 1, characterized in that: The air intake interface has a third connection structure for threaded connection to an external air source and / or an open intake end.

9. The microbubble generating adapter according to claim 8, characterized in that: The number of the multiple water flow channels is 4 to 20.

10. The microbubble generating adapter according to claim 9, characterized in that: The shell is integrally formed from metal or engineering plastic, and the porous water channel structure is sintered and / or injection molded from engineering plastic or metal powder.

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