Microbubble generating device

Abstract

The utility model discloses a microbubble generating device which comprises a shell, the interior of the shell comprises a water inlet area, a throat area, a first mixing area, a second mixing area and a crushing area which are coaxially arranged in the axial direction and sequentially communicated, the water inlet area extends towards the throat area in a necking shape, the minimum inner diameter of the first mixing area is larger than the inner diameter of the throat area, and the inner diameter of the second mixing area is larger than the inner diameter of the crushing area. The minimum inner diameter of the second mixing area is larger than that of the first mixing area, a plurality of cutting holes used for cutting bubbles are formed in the crushing area, the shell is further provided with an air inlet area, and the air inlet area is communicated with the first mixing area; when passing through the cutting hole, a part of bubble water impacts on the periphery of the cutting opening, rebounds and flows back towards the second mixing area, and the backflow water vapor is converged into a main jet flow column formed by the first mixing area and the second mixing area, and particularly, the backflow water vapor is effectively blocked at the transition position of the first mixing area and the second mixing area; the water vapor is prevented from flowing back to the first mixing area, so that the problem that the water vapor overflows and leaks due to the fact that the water flows back to the air inlet area from the first mixing area is solved.

Description

Technical Field

[0001] The utility model relates to water spraying equipment, in particular to a micro-bubble generating device. Background Art

[0002] As lifestyles change, people are demanding more and more versatile faucets. Some water-dispensing devices, such as faucets, showerheads, and nozzles, require not only basic water-dispensing functionality but also enhanced features. Microbubbles, a new type of water dispenser in kitchen and bathroom applications, are increasingly popular among consumers for their soft touch, splash-proofing, excellent cleaning performance, and sterilization capabilities.

[0003] Currently, the most common microbubble products in the kitchen and bathroom sector are pump-assisted, mechanical, and energy storage. While pump-assisted microbubble products can achieve excellent foaming effects, they require an additional water or air pump, which is not only relatively expensive but also limited in application by power supply. Some existing mechanical microbubble generation structures utilize Venturi tubes to achieve a water-air mixing effect, but these have been found to lack a complete air-intake mixing mechanism, and internal water can easily leak out through the vents. Utility Model Content

[0004] The present invention aims to solve at least one of the above-mentioned technical problems in the related art to a certain extent. To this end, the present invention provides a micro-bubble generating device.

[0005] To achieve the above purpose, the technical solution of the utility model is as follows:

[0006] According to the first aspect of the present invention, the microbubble generating device includes a shell, the interior of the shell includes a water inlet area, a throat area, a first mixing area, a second mixing area and a crushing area coaxially arranged and connected in sequence, the water inlet area extends in a constricted shape toward the throat area, the minimum inner diameter of the first mixing area is larger than the inner diameter of the throat area, the minimum inner diameter of the second mixing area is larger than the minimum inner diameter of the first mixing area, a plurality of cutting holes for cutting bubbles are provided in the crushing area, and the shell is also provided with an air inlet area, which is connected to the first mixing area.

[0007] The microbubble generating device according to the embodiment of the present invention has at least the following beneficial effects: when passing through the cut hole, a portion of the bubble water will rebound at the periphery of the cut and flow back toward the second mixing zone. The returned water vapor merges into the main jet column formed by the first mixing zone and the second mixing zone, and the returned water vapor is effectively blocked at the transition position between the first mixing zone and the second mixing zone, thereby preventing the water vapor from flowing back to the first mixing zone, and further preventing the water from flowing back from the first mixing zone to the air intake zone, causing the water vapor to overflow and leak.

[0008] According to some embodiments of the present invention, the first mixing zone includes a first conical cavity, which gradually shrinks axially toward the second mixing zone, and the inner diameter of the throat zone is smaller than the inner diameter at the large mouth end of the first conical cavity, and the inner diameter at the small mouth end of the first conical cavity is larger than the inner diameter of the throat zone.

[0009] According to some embodiments of the present invention, the second mixing zone includes a second conical cavity, which gradually shrinks axially toward the crushing zone, and the inner diameter at the large mouth end of the second conical cavity is larger than the minimum inner diameter of the first mixing zone, and the inner diameter at the small mouth end of the second conical cavity is larger than the minimum inner diameter of the first mixing zone.

[0010] According to some embodiments of the present invention, a filter screen is provided in the crushing zone, the filter screen intercepts the radial cross section of the crushing zone, and a plurality of the cut holes are formed on the filter screen.

[0011] According to some embodiments of the present invention, one or more filter screens are provided in the crushing zone; when more than one filter screen is provided, the apertures of the cut holes on each filter screen are the same or different.

[0012] According to some embodiments of the present invention, a partition is provided in the crushing zone, the partition is located on the upstream side of the cutting hole, the partition intercepts the radial cross section of the crushing zone, and a hollow structure is provided on the partition.

[0013] According to some embodiments of the present invention, the air inlet area includes a first air cavity and a second air cavity, and the first air cavity and the second air cavity are separated by a baffle wall along the axial direction of the shell, and the baffle wall is provided with an air hole connecting the first air cavity and the second air cavity, the first air cavity is connected to the external environment, and the second air cavity is arranged in a conical cavity around the throat area, the second air cavity gradually shrinks from the water inlet area to the throat area, and the small mouth end of the second air cavity is connected to the first mixing area.

[0014] According to some embodiments of the present invention, the shell includes a first connecting member, a second connecting member and a third connecting member, the first connecting member separates the inner cavity and the water inlet area, the water inlet area extends coaxially into the inner cavity, the interior of the second connecting member forms the first mixing area, the second connecting member extends the baffle wall, the second connecting member is installed in the inner cavity, the baffle wall separates the inner cavity into the first air cavity and the second air cavity, one end of the water inlet area is inserted into the second connecting member, an air inlet narrow channel is provided at the socket of the first mixing area and the water inlet area, the air inlet narrow channel connects the second air cavity and the first mixing area, the interior of the third connecting member forms the second mixing area and the crushing area, one end of the third connecting member extends into the inner cavity and is connected to the second connecting member, the third connecting member covers the end face of the second connecting member close to the first air cavity, and an air inlet connected to the first air cavity is provided on the side wall of the first connecting member.

[0015] According to some embodiments of the present invention, the inner diameter of the throat area is D, the minimum inner diameter of the first mixing area is D1, and the minimum inner diameter of the second mixing area is D2, which satisfies: D2>D1>D, and D1=D+1mm, D2=D1+1mm.

[0016] According to some embodiments of the present invention, the inner diameter D of the throat area ranges from 2.6 mm to 3.8 mm.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 It is a schematic diagram of the structural decomposition of the microbubble generating device;

[0020] Figure 2 It is a schematic diagram of the internal assembly structure of the microbubble generating device;

[0021] Figure 3 It is a schematic diagram of the internal structure of the exploded structure of the microbubble generating device;

[0022] Figure 4 is a structural schematic diagram of the second connecting member;

[0023] Figure 5 It is a structural diagram of the partition.

[0024] Figure markings: shell 100; water inlet area 110; throat area 120; first mixing zone 130; first conical cavity 131; first extension cavity 132; air inlet narrow channel 133; second mixing zone 140; second conical cavity 141; second extension cavity 142; crushing zone 150; air inlet zone 160; first air cavity 161; second air cavity 162; filter screen 200; cut hole 210; partition 300; hollow structure 310; first connecting member 410; inner cavity 411; air inlet 412; second connecting member 420; baffle 421; air hole 422; socket 423; air groove 424; third connecting member 430. DETAILED DESCRIPTION

[0025] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0026] The utility model relates to a micro-bubble generating device, which comprises a shell 100.

[0027] like Figure 1 、 Figure 2 and Figure 3As shown, the shell 100 can be tubular or in other shapes such as a box. The interior of the shell 100 is provided with a water inlet area 110, a throat area 120, a first mixing area 130, a second mixing area 140, a crushing area 150 and an air inlet area 160. The water inlet area 110, the throat area 120, the first mixing area 130, the second mixing area 140 and the crushing area 150 are coaxially arranged and sequentially connected in the axial direction. The water inlet area 110 can extend in a tapered shape toward the throat area 120. The throat area 120 can be configured as a circular cavity structure with equal diameters at all locations along the axial direction. The inner diameter of the throat area 120 is the same as the inner diameter of the small mouth end of the water inlet area 110. The inner diameter of the first mixing area 130 is larger than the inner diameter of the throat section. The first mixing area 130 can be configured as a circular cavity structure with equal diameters at all locations along the radial direction, or it can be configured as a cavity shape with other unequal diameters such as an expanded mouth. The minimum inner diameter of the first mixing zone 130 is larger than the inner diameter of the throat zone 120. The inner diameter of the second mixing zone 140 is larger than the minimum inner diameter of the first mixing zone 130. The second mixing zone 140 can be configured as a circular cavity structure with equal diameters at all points along the radial direction, or it can be configured as a cavity shape with other unequal diameters, such as a flared mouth. The minimum inner diameter of the second mixing zone 140 is larger than the minimum inner diameter of the first mixing zone 130. The crushing zone 150 can be configured as a cavity with equal diameters at all points along the axial direction, and the inner diameter of the crushing zone 150 is larger than the minimum inner diameter of the second mixing zone 140. A plurality of cutouts 210 are provided in the crushing zone 150. A filter screen 200 can be provided in the crushing zone 150, with the cutouts 210 formed on the filter screen 200; or a filter plate structure can be formed in the crushing zone 150, with the cutouts 210 provided on the filter plate. The air inlet zone 160 is connected to the first mixing zone 130, and air from the external environment can enter the first mixing zone 130 through the air inlet zone 160.

[0028] During operation, the water inlet area 110 serves as the upstream side of the housing 100, and the crushing area 150 serves as the downstream side. An external water supply system, such as a water heater or tap water pipe, is connected to the housing 100. Water enters the housing 100 and flows sequentially through the water inlet area 110, throat area 120, first mixing area 130, second mixing area 140, and crushing area 150. As water enters the throat area 120 from the water inlet area 110, the radial cross-sectional area decreases, reaching its minimum cross-sectional area in the throat area 120, and the water flow velocity reaches its maximum in the throat area 120. The cross-sectional area increases again from the throat area 120 to the first mixing area 130. When the high-speed water flow enters the first mixing zone 130, a negative pressure zone is created around the water flow. Under the influence of the external atmospheric pressure, air is drawn into the first mixing zone 130 through the air inlet zone 160. Larger bubbles are generated in the first mixing zone 130 by the air and water. The bubbly water then flows into the second mixing zone 140, further mixing to produce more bubbles, forming bubble-rich bubbly water. The relative inner diameters of the throat zone 120, first mixing zone 130, and second mixing zone 140 gradually increase. When water vapor enters the first mixing zone 130 from the throat zone 120, it does not directly impact the inner wall of the first mixing zone 130, causing it to rebound toward the throat zone 120. As a result, the outer diameter of the water column formed by water entering the first mixing zone 130 from the throat zone 120 increases. When water vapor is injected from the first mixing zone 130 into the second mixing zone 140, it will not directly hit the inner wall of the second mixing zone 140, causing the water vapor to rebound toward the first mixing zone 130. After the water column enters the second mixing zone 140 from the first mixing zone 130, the outer diameter of the water column becomes larger. The flow rate of the water column gradually decreases from the throat section, the first mixing zone 130, and the second mixing zone 140. The bubble water flows into the crushing zone 150, and the bubble water flows downstream of the crushing zone 150 through each cutting hole 210. The cutting hole 210 cuts the bubbles in the bubble water to form microbubbles, and the microbubbles are mixed in the water to form microbubble water. The downstream side of the crushing zone 150 is the outlet end of the shell 100, and the microbubble water is discharged from the outlet end of the shell 100 for use. When passing through the cut hole 210, a portion of the bubble water will rebound at the periphery of the cut and flow back toward the second mixing zone 140. The returned water vapor merges into the main jet column formed by the first mixing zone 130 and the second mixing zone 140, especially at the transition position between the first mixing zone 130 and the second mixing zone 140, the returned water vapor is effectively blocked to prevent the water vapor from flowing back to the first mixing zone 130, thereby preventing the water from flowing back from the first mixing zone 130 to the air inlet zone 160 and causing water vapor overflow and leakage.

[0029] In some specific embodiments of the present invention, the first mixing zone 130 includes a first conical cavity 131. The first conical cavity 131 gradually narrows along the axial direction toward the second mixing zone 140. The inner diameter of the large end of the first conical cavity 131 is larger than the inner diameter of the small end of the first conical cavity 131. The inner diameter of the throat section 120 is smaller than the inner diameter at the large end of the first conical cavity 131, and the inner diameter at the small end of the first conical cavity 131 is larger than the inner diameter of the throat section 120. The throat section 120 is coaxial with the first conical cavity 131, and one end of the throat section 120 can be arranged at the center of the large end of the first conical cavity 131. The small end of the first conical cavity 131 can be directly opened at the upstream end of the second mixing zone 140; or a first extension cavity 132 of the same diameter as the small end can be extended from the small end of the first conical cavity 131, and connected to the second mixing zone 140 through the first extension cavity 132. When water is injected from the throat section into the first mixing zone 130, it does not directly impact the inclined wall of the first conical cavity 131. However, when the water enters the crushing zone 150 and flows back toward the second mixing zone 140, it collides with the water in the second mixing zone 140, potentially causing some of the water in the second mixing zone 140 to flow back into the first mixing zone 130. This backflowing water primarily enters the first mixing zone 130 along the perimeter of the water column ejected from the small opening of the first conical cavity 131. After entering the first mixing zone 130, the backflowing water impacts the end surface of the large opening of the first conical cavity 131, rebounds, and rejoins the water column from the first mixing zone 130 to the second mixing zone 140. This reduces water overflow into the air intake zone 160.

[0030] Furthermore, the second mixing zone 140 includes a second conical cavity 141. The second conical cavity 141 gradually shrinks in the axial direction toward the crushing zone 150. The inner diameter at the large mouth end of the second conical cavity 141 is larger than the minimum inner diameter of the first mixing zone 130, and the inner diameter at the small mouth end of the second conical cavity 141 is larger than the minimum inner diameter of the first mixing zone 130. When water is injected from the first mixing zone 130 to the second mixing zone 140, it will not directly hit the inclined wall of the second conical cavity 141. The first conical cavity 131 and the second conical cavity 141 are coaxially arranged. The small mouth end of the first conical cavity 131 or the first extension cavity 132 extending therefrom is connected to the center position of the large mouth end of the second conical cavity 141. The inner diameter of the large mouth end of the second conical cavity 141 is larger than the inner diameter of the small mouth end. The small opening of the second conical chamber 141 can be directly located at the end of the crushing zone 150, or a second extension chamber 142 of equal diameter can be extended from the small opening of the second conical chamber 141, which is then connected to the crushing zone 150 via the second extension chamber 142. When some water flows back from the crushing zone 150 to the second mixing zone 140, the return water enters the second conical chamber 141 from the small opening of the second mixing zone 140. The return water then impacts the end surface of the large opening of the second conical chamber 141 along the inclined wall of the second conical chamber 141, where it rebounds and rejoins the water column sprayed from the second conical chamber 141 toward the crushing zone 150. This further effectively prevents water from flowing back into the second conical chamber 141 and continuing to flow back into the first mixing zone 130, thereby effectively preventing water from overflowing from the first mixing zone 130 into the air intake zone 160.

[0031] Alternatively, the inner diameter of the throat region 120 may be D, the minimum inner diameter of the first mixing region 130 may be D1, and the minimum inner diameter of the second mixing region 140 may be D2. The conditions D2 > D1 > D are met, and D1 = D + 1 mm, and D2 = D1 + 1 mm. Preferably, the inner diameter D of the throat region 120 ranges from 2.6 mm to 3.8 mm.

[0032] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, a filter screen 200 is installed in the crushing zone 150. The filter screen 200 intercepts the radial cross-section of the crushing zone 150. A plurality of cutouts 210 are formed in the filter screen 200. As water vapor flows downstream from the crushing zone 150, it inevitably flows through the filter screen 200. The cutouts 210 in the filter screen 200 align the air bubbles, creating microbubbles that mix with the water to form microbubble water. Simultaneously, as the water flows through the filter screen 200, it straightens the water flow, eliminating radial velocity, and allowing the water to flow out along the axial direction of the crushing zone 150.

[0033] In the crushing zone 150, one or more filter screens 200 are provided. Specifically, the filter screens 200 may be provided in one, two, or more layers. When more than one filter screen 200 is provided, the filter screens 200 are sequentially distributed along the axial direction of the crushing zone 150. The filter screens 200 may be stacked or spaced apart. The apertures 210 on the filter screens 200 may be the same or different in diameter. For example, three layers of filter screens 200 may be provided in the crushing zone 150, with the filter screens 200 on the upper and lower sides having a 200-mesh size and the filter screen 200 in the middle layer having an 800-mesh size.

[0034] In some specific embodiments of the present invention, Figure 1 、 Figure 2 、 Figure 3 and Figure 5 As shown, a partition 300 is provided in the crushing zone 150. The partition 300 is located on the upstream side of the location of the cutting hole 210. That is, the partition 300 is located between the second mixing zone 140 and the filter screen 200 in the crushing zone 150. The partition 300 is intercepted on the radial cross section of the crushing zone 150. A hollow structure 310 is provided on the partition 300, and the hollow structure 310 can be a plurality of openings provided on the partition 300. Water enters the crushing zone 150 from the second mixing zone 140 and flows through the partition 300 and the filter screen 200 in turn. Part of the water impacts the filter screen 200 and forms a backflow. The backflowing bubble water flow impacts the partition 300 and is disturbed by the partition 300, and finally forms a uniformly distributed bubble water flow that fills the crushing zone 150 upstream of the filter screen 200 and then penetrates the filter screen 200 to cut and form micro-bubble water.

[0035] In some embodiments of the present invention, Figure 2 、 Figure 3 and Figure 4 As shown, the air inlet area 160 includes a first air cavity 161 and a second air cavity 162. The first air cavity 161 and the second air cavity 162 are separated by a retaining wall 421 along the axial direction of the shell 100. The first air cavity 161 is closer to the crushing area 150 than the second air cavity 162. The retaining wall 421 is provided with an air hole 422 that connects the first air cavity 161 and the second air cavity 162. The first air cavity 161 is connected to the external environment. The second air cavity 162 is arranged in a conical cavity around the throat area 120, and the second air cavity 162 gradually shrinks from the water inlet area 110 to the throat area 120. The small end of the second air cavity 162 is connected to the first mixing area 130. During operation, air in the external environment is sucked into the first mixing area 130 through the first air cavity 161, the air hole 422, and the second air cavity 162. After the air enters the second air cavity 162 , it flows toward the small opening of the second air cavity 162 . The air velocity gradually increases, thereby preventing the water in the first mixing area 130 from overflowing into the second air cavity 162 .

[0036] Specifically, such as Figure 1 、 Figure 2 and Figure 3 As shown, the shell 100 includes a first connecting member 410, a second connecting member 420 and a third connecting member 430. The first connecting member 410 can be set to a hollow cylindrical shape, and its interior is separated into an inner cavity 411 and a water inlet area 110. The center of the downstream side of the water inlet area 110 extends axially into the inner cavity 411 in a conical shape. The second connecting member 420 can be set to a hollow cylindrical shape, and the hollow interior of the second connecting member 420 forms a first mixing zone 130. A retaining wall 421 extends radially from the circumferential wall of the second connecting member 420. The second connecting member 420 is installed in the inner cavity 411, and the circumferential side wall of the retaining wall 421 abuts against the inner wall of the inner cavity 411, and a sealing ring can be provided between the two. The inner cavity 411 is separated into a first air cavity 161 and a second air cavity 162 by the retaining wall 421. The small mouth end of the water inlet area 110 is inserted into the second connecting member 420. An air inlet narrow channel 133 is provided at the socket 423 between the first mixing zone 130 and the water inlet zone 110. Alternatively, the second connecting member 420 forms a socket 423 at the upstream side of the first mixing zone 130. The inner diameter of the socket 423 may be equal to the inner diameter of the large mouth end of the first conical cavity 131. One or more air grooves 424 are provided on the inner wall of the socket 423. The air grooves 424 extend axially, with one end of the air grooves 424 connected to the first mixing zone 130 and the other end connected to the first air cavity 161. When the end of the water inlet zone 110 is inserted into the socket 423, the outer wall of the end of the water inlet zone 110 cooperates with the air grooves 424 to form the air inlet narrow channel 133. The air inlet narrow channel 133 connects the second air cavity 162 and the first mixing zone 130. When air passes through the air inlet narrow channel 133, the flow rate is high, and the size of the air inlet narrow channel 133 is small, which can effectively prevent the water in the first mixing zone 130 from overflowing from the air inlet narrow channel 133 to the second air cavity 162. The third connecting member 430 can be set to a hollow cylindrical shape. The interior of the third connecting member 430 forms the second mixing zone 140 and the crushing zone 150. One end of the third connecting member 430 extends into the inner cavity 411 and is connected to the second connecting member 420. The third connecting member 430 covers the end surface of the second connecting member 420 close to the first air cavity 161. The third connecting member 430 can be pressed axially onto the second connecting member 420 by a screw cap, and the screw cap is connected to the first connecting member 410 by a threaded connection. An air inlet 412 connected to the first air cavity 161 is provided on the side wall of the first connecting member 410. Air enters the first air cavity 161 through the air inlet 412.

[0037] Throughout this specification, references to "some specific embodiments" and the like indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these 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 any one or more embodiments or examples.

[0038] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A microbubble generating device, characterized in that: The invention comprises a shell (100), wherein the interior of the shell (100) comprises a water inlet area (110), a throat area (120), a first mixing area (130), a second mixing area (140) and a crushing area (150) which are coaxially arranged and sequentially connected. The water inlet area (110) extends in a constricted shape toward the throat area (120). The minimum inner diameter of the first mixing area (130) is larger than the inner diameter of the throat area (120). The minimum inner diameter of the second mixing area (140) is larger than the minimum inner diameter of the first mixing area (130). The crushing area (150) is provided with a plurality of cutting holes (210) for cutting bubbles. The shell (100) is also provided with an air inlet area (160), which is connected to the first mixing area (130).

2. The microbubble generating device according to claim 1, wherein: The first mixing zone (130) includes a first conical cavity (131), and the first conical cavity (131) gradually decreases in the axial direction toward the second mixing zone (140). The inner diameter of the throat zone (120) is smaller than the inner diameter at the large mouth end of the first conical cavity (131), and the inner diameter at the small mouth end of the first conical cavity (131) is larger than the inner diameter of the throat zone (120).

3. The microbubble generating device according to claim 1 or 2, characterized in that: The second mixing zone (140) includes a second conical cavity (141), which gradually shrinks in the axial direction toward the crushing zone (150), and the inner diameter of the second conical cavity (141) at the large end is larger than the minimum inner diameter of the first mixing zone (130), and the inner diameter of the second conical cavity (141) at the small end is larger than the minimum inner diameter of the first mixing zone (130).

4. The microbubble generating device according to claim 1, wherein: A filter screen (200) is provided in the crushing zone (150), the filter screen (200) intercepts on a radial cross section of the crushing zone (150), and a plurality of cut holes (210) are formed on the filter screen (200).

5. The microbubble generating device according to claim 4, characterized in that: One or more filter screens (200) are provided in the crushing zone (150); when more than one filter screen (200) is provided, the cut holes (210) on each filter screen (200) have the same or different apertures.

6. The microbubble generating device according to claim 1 or 4, characterized in that: A partition (300) is provided in the crushing zone (150), the partition (300) is located on the upstream side of the location of the cut hole (210), the partition (300) intercepts the radial cross section of the crushing zone (150), and a hollow structure (310) is provided on the partition (300).

7. The microbubble generating device according to claim 1, wherein: The air inlet area (160) includes a first air cavity (161) and a second air cavity (162), the first air cavity (161) and the second air cavity (162) being separated by a retaining wall (421) along the axial direction of the shell (100), the retaining wall (421) being provided with an air hole (422) for connecting the first air cavity (161) and the second air cavity (162), the first air cavity (161) being connected to the external environment, the second air cavity (162) being arranged in a conical cavity around the throat area (120), the second air cavity (162) gradually shrinking from the water inlet area (110) toward the throat area (120), and the small end of the second air cavity (162) being connected to the first mixing area (130).

8. The microbubble generating device according to claim 7, characterized in that: The housing (100) includes a first connecting member (410), a second connecting member (420), and a third connecting member (430). The first connecting member (410) separates an inner cavity (411) and the water inlet area (110). The water inlet area (110) coaxially extends into the inner cavity (411). The interior of the second connecting member (420) forms the first mixing area (130). The second connecting member (420) extends out of the retaining wall (421). The second connecting member (420) is installed in the inner cavity (411). The retaining wall (421) separates the inner cavity (411) into the first air cavity (161) and the second air cavity (162). One end of the water inlet area (110) is inserted into the second connecting member (420). ), an air inlet narrow channel (133) is provided at the socket (423) between the first mixing zone (130) and the water inlet zone (110), and the air inlet narrow channel (133) connects the second air cavity (162) and the first mixing zone (130), and the interior of the third connecting member (430) forms the second mixing zone (140) and the crushing zone (150), one end of the third connecting member (430) extends into the inner cavity (411) and is connected to the second connecting member (420), and the third connecting member (430) covers the end face of the second connecting member (420) close to the first air cavity (161), and an air inlet (412) connected to the first air cavity (161) is provided on the side wall of the first connecting member (410).

9. The microbubble generating device according to claim 1, characterized in that: The inner diameter of the throat area (120) is D, the minimum inner diameter of the first mixing area (130) is D1, and the minimum inner diameter of the second mixing area (140) is D2, which satisfies: D2>D1>D, and D1=D+1mm, D2=D1+1mm.

10. The microbubble generating device according to claim 9, characterized in that: The inner diameter D of the throat area (120) has a value range of 2.6 mm to 3.8 mm.

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