Microbubble generation system and water heater

Abstract

This invention discloses a microbubble generating system and a water heater, relating to the field of microbubble technology. The microbubble generating system includes an aerator and a dissolved air system. The aerator has an inlet surface, an outlet surface, and multiple liquid passages. Each liquid passage has its two ends penetrating the inlet and outlet surfaces, respectively. The multiple liquid passages include at least a first flow channel and a second flow channel. Both the first and second flow channels are constructed as variable-diameter channels, with the cross-sectional area of ​​the narrowest part of the first flow channel being smaller than that of the narrowest part of the second flow channel. The dissolved air system includes a fluid conveying component, a dissolved air tank, and a delivery pipeline. The fluid conveying component has an inlet, a branch flow channel, and an outlet connected in sequence. The branch flow channel includes at least a first branch flow channel and a second branch flow channel arranged in parallel. The channel wall of the first branch flow channel has an air inlet, and the outlet is connected to the dissolved air tank. The outlet of the dissolved air tank is connected to the aerator via the delivery pipeline. The technical solution provided by this invention can achieve both good foaming effect and large flow rate output.

Description

Technical Field

[0001] This invention relates to the field of microbubble technology, and in particular to a microbubble generating system and a water heater. Background Technology

[0002] The bubbler is a crucial component in a microbubble generation system, used to produce microbubbles. Traditional bubblers have a simple flow channel structure. To improve foaming performance, the flow channel is typically designed to generate a significant pressure drop. While this pressure drop enhances foaming, it also increases flow resistance, leading to a decrease in flow rate and making it unsuitable for high-flow-rate applications. Consequently, microbubble generation systems often cannot simultaneously achieve both good foaming performance and high-flow-rate output. Summary of the Invention

[0003] The main objective of this invention is to propose a microbubble generating system and a water heater that can achieve both good foaming effect and large flow output.

[0004] To achieve the above objectives, the microbubble generating system proposed in this invention includes:

[0005] A bubbler having an inlet surface, an outlet surface, and multiple liquid passages, each liquid passage penetrating both ends of the inlet surface and the outlet surface respectively. The multiple liquid passages include at least a first flow channel and a second flow channel, both of which are constructed as variable-diameter channels. The cross-sectional area of ​​the narrowest part of the first flow channel is smaller than the cross-sectional area of ​​the narrowest part of the second flow channel.

[0006] A dissolved gas system includes a liquid delivery pipeline, a fluid conveying component, and a dissolved gas tank. The fluid conveying component has an inlet, a branch channel, and an outlet connected in sequence. The branch channel includes at least a first branch channel and a second branch channel arranged in parallel. The channel wall of the first branch channel is provided with an inlet for introducing external gas. The outlet is connected to the dissolved gas tank, and the outlet of the dissolved gas tank is connected to the bubbler via the liquid delivery pipeline.

[0007] In one embodiment, both the first flow channel and the second flow channel are constructed as Venturi flow channels, wherein the throat inner diameter of the first flow channel is smaller than the throat inner diameter of the second flow channel.

[0008] In one embodiment, the first flow channel includes a first tapered section, a first throat, and a first expanding section arranged and connected in sequence. The wide end of the first tapered section penetrates the liquid inlet surface, and the wide end of the first expanding section penetrates the liquid outlet surface. The first throat is a straight section of equal diameter extending from the narrow end of the first tapered section toward the narrow end of the first expanding section.

[0009] Wherein, the length of the first tapering segment is not less than 1.5 mm and not more than 3.5 mm;

[0010] And / or, the length of the first throat is not less than 0.7 mm and not more than 1.2 mm;

[0011] And / or, the expansion angle of the first gradually expanding segment is not less than 2 degrees and not greater than 5 degrees.

[0012] In one embodiment, at least a portion of the first flow channel is disposed near the center of the bubbler;

[0013] And / or, at least a portion of the second flow channel is provided near the edge of the bubbler.

[0014] In one embodiment, multiple first flow channels and multiple second flow channels are provided. The multiple first flow channels include a central foaming flow channel located at the center of the foamer and an edge foaming flow channel near the edge of the foamer. The edge foaming flow channel and the second flow channel are arranged at intervals along the circumference of the foamer.

[0015] In one embodiment, the second flow channel is provided on both sides of the central foaming flow channel in at least one radial direction of the foamer.

[0016] In one embodiment, the bubbler further includes a flow-dispersing element located downstream of the liquid outlet surface;

[0017] And / or, the bubbler further includes a bubble-breaking element located downstream of the liquid outlet surface.

[0018] In one embodiment, the first branch channel is configured to generate a low-pressure zone within the first branch channel when fluid passes through it, and the air inlet is at least partially oriented toward the low-pressure zone.

[0019] In one embodiment, the first branch channel is constructed as a Venturi channel, and the second branch channel is constructed as a straight channel.

[0020] The present invention also proposes a water heater, including the microbubble generating system described above.

[0021] The technical solution of this invention, by setting up a dissolved gas system and a bubbler, includes a fluid conveying component with a branch channel. The branch channel has at least a first branch channel and a second branch channel arranged in parallel. The first branch channel has an air inlet on its wall, allowing external gas to enter the first branch channel through the air inlet to mix with the liquid inside, thus producing a dissolved gas liquid. Simultaneously, the second branch channel continuously delivers liquid. This achieves both effective dissolved gas treatment and high flow rate requirements. Furthermore, multiple liquid passages are provided between the inlet and outlet surfaces of the bubbler. Each liquid passage extends through both the inlet and outlet surfaces, and these multiple liquid passages include at least the first and second branch channels arranged in parallel. Both the first and second branch channels are constructed as variable-diameter channels, but their narrowest points are designed differently, resulting in a smaller cross-sectional area at the narrowest point of the first branch channel compared to the narrowest point of the second branch channel. The narrowest section of the first flow channel has a relatively small cross-sectional area, resulting in a significant pressure reduction that promotes the precipitation of more microbubbles, enhancing the foaming effect and generating more microbubbles. Conversely, the narrowest section of the second flow channel has a relatively large cross-sectional area, leading to lower resistance and facilitating high-flow-rate liquid passage. Thus, the first flow channel primarily serves for foaming, while the second flow channel primarily serves for flow passage, ensuring both good foaming performance and high-flow-rate output. Through the coordination of the fluid transport components and the bubbler, the entire microbubble generation system ensures effective gas dissolution and high-flow-rate delivery in its upstream flow path via the fluid transport components, and ensures effective foaming and high-flow-rate output in its downstream flow path via the bubbler, thereby guaranteeing the output of a large flow rate of microbubble liquid. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of an embodiment of the bubbler provided by the present invention;

[0024] Figure 2 for Figure 1 Axial orthographic projection view of the central bubbler;

[0025] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure of the intermediate aerator;

[0026] Figure 4 for Figure 3A schematic diagram showing the dimensions of the first flow channel in the middle;

[0027] Figure 5 A schematic diagram of the structure of an embodiment of the water heater provided by the present invention;

[0028] Figure 6 for Figure 5 A schematic diagram of the structure of an embodiment of a fluid transport component;

[0029] Figure 7 for Figure 6 A cross-sectional structural diagram of a medium-fluid transport component.

[0030] Explanation of icon numbers:

[0031] 1000, Water heater;

[0032] 100. Microbubble generation system;

[0033] 10. Aerator; 10a. Liquid inlet surface; 10b. Liquid outlet surface; 11. Liquid passage; 111. First flow channel; 1111. First converging section; 1112. First throat; 1113. First expanding section; 111a. Central foaming flow channel; 111b. Edge foaming flow channel; 112. Second flow channel; 1121. Second converging section; 1122. Second throat; 1123. Second expanding section;

[0034] 20. Infusion tubing;

[0035] 30. Fluid conveying component; 301. Liquid inlet; 302. Flow branch channel; 302a. First branch channel; 302b. Second branch channel; 303. Liquid outlet; 304. Liquid inlet channel; 305. Liquid outlet channel; 306. Air inlet; 306a. First section; 306b. Second section; 3061. Air inlet; 3062. Through port; 31. Liquid inlet section; 32. Flow branch section; 33. Liquid outlet section;

[0036] 40. Dissolved gas tank; 50. Air pump;

[0037] 200. Heat exchange system;

[0038] 300. Booster pump.

[0039] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0041] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0042] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0043] The bubbler is a crucial component in a microbubble generation system, used to produce microbubbles. Traditional bubblers have a simple flow channel structure. To improve foaming performance, the flow channel is typically designed to generate a significant pressure drop. While this pressure drop enhances foaming, it also increases flow resistance, leading to a decrease in flow rate and making it unsuitable for high-flow-rate applications. Consequently, microbubble generation systems often cannot simultaneously achieve both good foaming performance and high-flow-rate output.

[0044] For example, an aerator can be installed on the pipe connecting the water heater to the user's water outlet (such as the shower head). The aerator can precipitate microbubbles in the hot water output by the water heater, turning it into microbubble water, thereby improving the user's bathing experience. However, traditional aerators usually have too much resistance and too small an output flow rate, which cannot effectively improve the user's bathing experience.

[0045] Based on this, the present invention proposes a microbubble generating system 100, which can achieve both good foaming effect and large flow rate output.

[0046] Please see Figures 1 to 7In one embodiment of the present invention, the microbubble generating system includes a bubbler 10 and a dissolved gas system. The bubbler 10 has an inlet surface 10a, an outlet surface 10b, and multiple liquid passages 11. Each liquid passage 11 has its two ends penetrating the inlet surface 10a and the outlet surface 10b, respectively. The multiple liquid passages 11 include at least a first flow channel 111 and a second flow channel 112. Both the first flow channel 111 and the second flow channel 112 are constructed as variable diameter flow channels. The cross-sectional area of ​​the narrowest part of the first flow channel 111 is smaller than that of the narrowest part of the second flow channel 112. The flow cross-sectional area; the dissolved gas system includes a liquid delivery pipeline 20, a fluid delivery component 30, and a dissolved gas tank 40. The fluid delivery component 30 has an inlet 301, a branch channel 302, and an outlet 303 connected in sequence. The branch channel 302 includes at least a first branch channel 302a and a second branch channel 302b arranged in parallel. The channel wall of the first branch channel 302a is provided with an inlet 3061 for introducing external gas. The outlet 303 is connected to the dissolved gas tank 40. The outlet of the dissolved gas tank 40 is connected to the bubbler 10 via the liquid delivery pipeline 20.

[0047] The microbubble generating system 100 can be applied to water-using equipment to generate microbubbles, including but not limited to water heaters 1000, washing machines, and bathing equipment. The dissolved gas system is used to transport a dissolved gas liquid containing a large amount of dissolved gas to the aerator 10 via a delivery pipeline 20. The aerator 10 precipitates microbubbles from the dissolved gas liquid to form a microbubble liquid. Since the aerator 10 has at least a first flow channel 111 and a second flow channel 112 arranged in parallel, both the first and second flow channels 111 and 112 are constructed as variable-diameter flow channels, with differentiated dimensions at their narrowest points. The narrowest point of the first flow channel 111 has a relatively small flow cross-sectional area, which can generate a greater pressure reduction, facilitating the precipitation of more microbubbles and improving the foaming effect. Conversely, the narrowest point of the second flow channel 112 has a relatively large flow cross-sectional area, resulting in relatively low resistance at its narrowest point, which is conducive to the passage of large flow rates of liquid. In this way, the first flow channel 111 is mainly used for foaming, and the second flow channel 112 is mainly used for flow passage, so as to ensure both good foaming effect and high flow rate output.

[0048] The inlet 301 of the fluid conveying component 30 can be connected to an external pipeline. The fluid conveying component 30 is used to transport liquid in the pipeline to the dissolved gas tank 40, and then from the dissolved gas tank 40 to the aerator 10 via the delivery pipeline 20. The fluid conveying component 30 has a branch channel 302, which has at least a first branch channel 302a and a second branch channel 302b arranged in parallel. The channel wall of the first branch channel 302a is provided with an air inlet 3061, so that when the liquid passes through the first branch channel 302a, external gas can enter the first branch channel 302a through the air inlet 3061 to mix with the liquid in the first branch channel 302a to obtain a dissolved gas liquid. At the same time, the second branch channel 302b can continuously transport liquid. In this way, both the dissolved gas effect and the large flow rate requirement can be met simultaneously. Furthermore, through the cooperation of the fluid conveying component 30 and the bubbler 10, the entire microbubble generating system 100 can ensure the gas dissolving effect and large flow rate through the fluid conveying component 30 in its upstream flow path, and can ensure the foaming effect and large flow rate through the bubbler 10 in its downstream flow path, thereby ensuring the output of a large flow rate of microbubble liquid.

[0049] The bubbler 10 has an inlet surface 10a and an outlet surface 10b, which can be located on opposite sides or adjacent sides of the bubbler 10. Optionally, the bubbler 10 is generally cylindrical, with the inlet surface 10a and the outlet surface 10b formed on its axial end faces, respectively. The bubbler 10 has multiple (i.e., at least two) liquid passages 11, which are arranged in parallel. Liquid entering from the inlet surface 10a can be diverted into each liquid passage 11 and then output from the outlet surface 10b. The multiple liquid passages 11 include at least a first flow channel 111 and a second flow channel 112. Both the first flow channel 111 and the second flow channel 112 are constructed as variable diameter flow channels, where a variable diameter flow channel refers to a fluid channel whose cross-sectional area or shape changes along the flow direction. For example, a variable diameter flow channel can be a Venturi flow channel, a stepped flow channel, or other flow channels with varying cross-sections.

[0050] Both the first flow channel 111 and the second flow channel 112 are constructed as variable diameter flow channels. The liquid flow velocity increases significantly in the variable diameter region (such as narrow places or intersections), the static pressure decreases, and the solubility of gas in the liquid decreases, which is conducive to the large-scale precipitation of microbubbles in the liquid to form microbubble liquid.

[0051] The flow cross-sectional area of ​​a flow channel refers to the effective cross-sectional area that allows fluid to pass through in a cross-section perpendicular to the flow direction. The flow cross-sectional area of ​​the narrowest part of the first flow channel 111 is smaller than that of the narrowest part of the second flow channel 112. This results in a significant pressure drop at the narrowest part of the first flow channel 111, reducing the solubility of gas in the liquid and thus promoting the precipitation of numerous microbubbles, which enhances the foaming effect and generates more microbubbles. Conversely, the flow cross-sectional area of ​​the narrowest part of the second flow channel 112 is relatively large, resulting in relatively low resistance and facilitating high-flow-rate liquid passage. Thus, by differentiating the design of the first and second flow channels 111 and 112, with the first flow channel 111 primarily used for foaming and the second flow channel 112 primarily used for flow passage, both good foaming performance and high-flow-rate output can be achieved. The number of the first and second flow channels 111 and 112 can be one, two, or more depending on actual needs; no specific limitation is made here. Optionally, multiple first flow channels 111 and second flow channels 112 are provided to ensure better foaming effect and greater flow output.

[0052] Understandably, when the resistance of the second flow channel 112 is too low and the resistance of the first flow channel 111 is too high, the liquid will tend to flow towards the second flow channel 112, resulting in a smaller liquid flow rate into the first flow channel 111 and affecting the foaming effect. Therefore, the second flow channel 112 is also designed as a variable diameter flow channel, so that while ensuring a large flow rate output, the overall flow channel resistance of the second flow channel 112 is not too low, thereby better balancing the flow distribution between the first flow channel 111 and the second flow channel 112.

[0053] The technical solution of this invention, by setting up a dissolved gas system and an aerator 10, includes a fluid conveying component 30 with a branch channel 302. The branch channel 302 has at least a first branch channel 302a and a second branch channel 302b arranged in parallel. The channel wall of the first branch channel 302a is provided with an air inlet 3061, so that when the liquid passes through the first branch channel 302a, external gas can enter the first branch channel 302a through the air inlet 3061 to mix with the liquid in the first branch channel 302a to obtain a dissolved gas liquid. At the same time, the second branch channel 302b can continuously transport liquid. In this way, both the dissolved gas effect and the large flow rate requirement can be met simultaneously. Furthermore, multiple liquid passages 11 are provided between the liquid inlet surface 10a and the liquid outlet surface 10b of the aerator 10. The two ends of each liquid passage 11 respectively penetrate the liquid inlet surface 10a and the liquid outlet surface 10b. The multiple liquid passages 11 include at least a first channel 111 and a second channel 112 arranged in parallel. Both the first flow channel 111 and the second flow channel 112 are constructed as variable-diameter flow channels, but the dimensions of their narrowest points are designed differently. The cross-sectional area of ​​the narrowest point of the first flow channel 111 is smaller than that of the narrowest point of the second flow channel 112. The relatively smaller cross-sectional area of ​​the narrowest point of the first flow channel 111 results in a greater pressure reduction, which is beneficial for the precipitation of more microbubbles and improves the foaming effect. Conversely, the relatively larger cross-sectional area of ​​the narrowest point of the second flow channel 112 results in relatively lower resistance, which is beneficial for large-flow-rate liquid passage. Thus, the first flow channel 111 is primarily used for foaming, while the second flow channel 112 is primarily used for flow passage, thereby ensuring both good foaming performance and the ability to handle large flow rates. Through the cooperation of the fluid conveying component 30 and the bubbler 10, the entire microbubble generating system 100 can ensure the dissolved gas effect and large flow rate through the fluid conveying component 30 in its upstream flow path, and can ensure the foaming effect and large flow rate through the bubbler 10 in its downstream flow path, thereby ensuring the output of a large flow rate of microbubble liquid.

[0054] like Figure 3 As shown, in one embodiment, both the first flow channel 111 and the second flow channel 112 are constructed as Venturi channels, and the throat inner diameter of the first flow channel 111 is smaller than the throat inner diameter of the second flow channel 112.

[0055] A Venturi flow channel is a flow channel designed based on the Venturi effect. Its structural characteristics include a narrow middle and wider ends, utilizing changes in cross-sectional area to regulate fluid pressure, velocity, or flow rate. A Venturi flow channel generally consists of a converging section, a throat, and a diverging section connected sequentially along the fluid flow direction. The narrowest part of the Venturi flow channel is the throat. At the throat, due to increased flow velocity and decreased static pressure, dissolved gases may precipitate, entrained gases may expand, and when the throat pressure drops below the liquid's saturated vapor pressure, localized vaporization may occur, forming vapor cavitation.

[0056] In this embodiment, designing both the first flow channel 111 and the second flow channel 112 as Venturi channels is more conducive to microbubble precipitation. The throat inner diameter of the first flow channel 111 is relatively small, which is more conducive to generating a greater pressure reduction at the throat of the first flow channel 111, which is beneficial to the precipitation of more microbubbles, thereby achieving a better foaming effect. The throat inner diameter of the second flow channel 112 is relatively large, and the pressure reduction is smaller. Although the foaming effect is weakened, the throat resistance of the second flow channel 112 is relatively small, which is more conducive to the passage of liquid and ensures a large flow rate output. Thus, through the cooperation of the first flow channel 111 and the second flow channel 112, both foaming effect and large flow rate output can be well balanced.

[0057] like Figure 3 As shown, in one embodiment, the first flow channel 111 includes a first tapering section 1111, a first throat 1112, and a first expanding section 1113 arranged and connected in sequence. The wide end of the first tapering section 1111 penetrates the inlet liquid surface 10a, and the wide end of the first expanding section 1113 penetrates the outlet liquid surface 10b. The first throat 1112 is a straight section of equal diameter extending from the narrow end of the first tapering section 1111 toward the narrow end of the first expanding section 1113.

[0058] In this embodiment, the first flow channel 111 is constructed as a Venturi flow channel having a first tapering section 1111, a first throat 1112, and a first expanding section 1113. The inner diameter of the first tapering section 1111 gradually decreases from the liquid inlet surface 10a toward the first throat 1112, and the inner diameter of the first expanding section 1113 gradually expands from the first throat 1112 toward the liquid outlet surface 10b. The first throat 1112 is a straight section of constant diameter with a certain length. When the liquid passes through the first flow channel 111, the liquid velocity gradually increases in the first converging section 1111, and the pressure drops sharply at the first throat 1112. When the pressure at the first throat 1112 is lower than the liquid's saturated vapor pressure, dissolved gas precipitates or the liquid partially vaporizes, forming cavitation bubbles. Furthermore, the high-speed liquid at the first throat 1112 creates strong turbulence, exerting shear force on the gas jet and breaking it into microbubbles. These microbubbles flow towards the first expanding section 1113, where the liquid velocity gradually decreases and the pressure rises again. The velocity gradient in the first expanding section 1113 further promotes bubble refinement. By setting the first throat 1112 as a straight section of constant diameter with a certain length, a low-pressure zone of a certain length can be formed in the first throat 1112. The microbubbles generated at the end of the first converging section 1111 can flow smoothly for a certain distance in the first throat 1112 and reach dissolution equilibrium, thus making the generated microbubble liquid more stable.

[0059] To avoid excessively large bubbles, the length of the first converging section 1111 cannot be too short or too long. If the length of the first converging section 1111 is too short, the liquid will be unable to adapt quickly to the abrupt change in cross-section due to inertia, resulting in flow separation and energy loss near the inlet of the first converging section 1111. This leads to a decrease in the effective flow velocity at the first throat 1112, weakening the shear force and causing the bubble size to increase. If the length of the first converging section 1111 is too long, the fluid acceleration will slow down, the flow velocity at the first throat 1112 will decrease, resulting in insufficient shear force, reduced gas fragmentation efficiency, and increased bubble size.

[0060] like Figure 4 As shown, in one embodiment, the length of the first tapered section 1111 is not less than 1.5 mm and not more than 3.5 mm. That is, the length L1 of the first tapered section 1111 is within the range of 1.5 mm to 3.5 mm. This ensures that the length of the first tapered section 1111 is moderate, reducing flow separation and energy loss near the inlet of the first tapered section 1111, and ensuring that the first throat 1112 has a high flow velocity and a large shear force, thereby ensuring gas breaking efficiency and avoiding excessively large bubble sizes to further achieve a better foaming effect. For example, the length L1 of the first tapered section 1111 can be 1.5 mm, 2 mm, 3 mm, 3.5 mm, or any other value within the range of 1.5 mm to 3.5 mm.

[0061] The length of the first throat 1112 should not be too short or too long. If the length of the first throat 1112 of the first flow channel 111 is too short, the gas will not have enough residence time in the high-speed shear zone and will not be fully broken up before entering the first diffuser section 1113, resulting in larger bubble sizes and a wider size distribution. Furthermore, the first throat 1112 is the point of lowest pressure reduction. If the first throat 1112 is too short, the first diffuser section 1113 will not be able to effectively utilize kinetic energy to convert pressure energy, leading to an increase in overall pressure loss. In addition, the generation and collapse of cavitation bubbles require a certain amount of time. If the first throat 1112 is too short, the cavitation process will be incomplete, and the microbubble production will also decrease. If the length of the first throat 1112 of the first flow channel 111 is too long, the friction time between the fluid and the wall will be prolonged, the turbulent energy dissipation will be intensified, the flow velocity of the first throat 1112 will gradually decrease, the shear force will weaken, and the bubbles may re-coalesce. Moreover, an excessively long first throat 1112 is prone to inducing secondary flow or vortices, resulting in uneven distribution of the gas and liquid phases.

[0062] To achieve better foaming results, such as Figure 4As shown, in one embodiment, the length of the first throat 1112 is not less than 0.7 mm and not more than 1.2 mm. That is, the length L2 of the first throat 1112 is within the range of 0.7 mm to 1.2 mm. This ensures that the length of the first throat 1112 is moderate, allowing the gas sufficient residence time in the high-speed shear zone of the first throat 1112 to be fully broken down, forming smaller microbubbles with a narrower size distribution. Simultaneously, it ensures that the first diffuser 1113 can effectively utilize kinetic energy to convert into pressure energy, reducing pressure loss. Furthermore, it allows for a more complete cavitation process in the first throat 1112, increasing the amount of microbubbles generated. It also mitigates problems such as bubble re-agglomeration and uneven gas-liquid phase distribution caused by an excessively long first throat 1112. For example, the length L2 of the first throat 1112 can be 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, or any other value within the range of 0.7 mm to 1.2 mm.

[0063] The expansion angle of the first diffuser 1113 is the angle between the two side walls of the first diffuser 1113. The expansion angle is a key parameter affecting pressure recovery, flow stability, and energy efficiency. If the expansion angle of the first diffuser 1113 is too small, the slow pressure recovery may cause bubbles to coalesce in the first diffuser 1113; if the expansion angle of the first diffuser 1113 is too large, it will significantly reduce bubble production and uniformity.

[0064] like Figure 4 As shown, in one embodiment, the expansion angle of the first expanding segment 1113 is not less than 2 degrees and not greater than 5 degrees. That is, the expansion angle of the first expanding segment 1113 is α, satisfying 2°≤α≤5°. This ensures that the expansion angle of the first expanding segment 1113 is moderate, effectively preventing bubbles from coalescing within the first expanding segment 1113 and guaranteeing bubble yield and uniformity, thereby further improving the foaming effect. For example, the expansion angle α of the first expanding segment 1113 can be 2°, 3°, 4°, 5°, or any other value within the range of 2° to 5°.

[0065] Optionally, the length of the first tapering section 1111 is not less than 1.5 mm and not more than 3.5 mm; the length of the first throat 1112 is not less than 0.7 mm and not more than 1.2 mm; and the expansion angle of the first expanding section 1113 is not less than 2 degrees and not more than 5 degrees. This makes the overall size design of the first flow channel 111 more reasonable and can achieve a better foaming effect.

[0066] The structure of the second flow channel 112 is similar to that of the first flow channel 111, with the main difference being the throat size.

[0067] For example, such as Figure 3As shown, the second flow channel 112 includes a second tapering section 1121, a second throat 1122, and a second expanding section 1123 arranged and connected in sequence. The wide end of the second tapering section 1121 penetrates the inlet liquid surface 10a, and the wide end of the second expanding section 1123 penetrates the outlet liquid surface 10b. The second throat 1122 is a straight section of equal diameter extending from the narrow end of the second tapering section 1121 toward the narrow end of the second expanding section 1123. The inner diameter of the second throat 1122 is larger than the inner diameter of the first throat 1112.

[0068] like Figure 2 and Figure 3 As shown, in one embodiment, at least a portion of the first flow channel 111 is positioned near the center of the bubbler 10. It is understood that when liquid is transported in a pipeline, the liquid velocity is higher at the center of the pipeline. By positioning at least a portion of the first flow channel 111 near the center of the bubbler 10, when an external pipeline is connected to the bubbler 10, the liquid velocity entering the first flow channel 111 is higher. Increased velocity and decreased static pressure are more conducive to microbubble precipitation. For example, when there is only one first flow channel 111, it can be positioned at the center of the bubbler 10. When there are multiple first flow channels 111, at least one can be positioned at the center of the bubbler 10, with the remaining first flow channels 111 positioned at the edge of the bubbler 10.

[0069] like Figure 2 and Figure 3 As shown, in one embodiment, at least a portion of the second flow channel 112 is disposed near the edge of the aerator 10. It is understood that when liquid is transported in a pipeline, the liquid flow rate at the edge of the pipeline is relatively slow, and the flow resistance of the second flow channel 112 is relatively lower, which is more conducive to the smooth passage of the relatively slow liquid.

[0070] like Figure 2 As shown, in one embodiment, multiple first flow channels 111 and multiple second flow channels 112 are provided. The multiple first flow channels 111 include a central foaming flow channel 111a located at the center of the foamer 10 and an edge foaming flow channel 111b near the edge of the foamer 10. The edge foaming flow channel 111b and the second flow channel 112 are arranged at intervals along the circumference of the foamer 10.

[0071] In this embodiment, the liquid flow rate in the first flow channel 111 (i.e., the central foaming flow channel 111a) located at the center of the bubbler 10 is higher and the static pressure is lower, thereby enabling more microbubbles to precipitate at the center of the bubbler 10. Simultaneously, the first channel near the edge of the bubbler 10 (i.e., the edge foaming flow channel 111b) also generates a certain amount of microbubbles at the edge of the bubbler 10, ensuring that microbubbles are generated at both the center and edge of the bubbler 10, resulting in a more uniform distribution of microbubbles. The second flow channel 112 is positioned near the edge of the bubbler 10, which facilitates a large flow rate output at the edge of the bubbler 10. Furthermore, the microbubble liquid at the center of the bubbler 10 can be fully mixed with the dissolved gas liquid at the edge, and the microbubble liquid at the edge can also be fully mixed with the dissolved gas liquid at the edge, resulting in a more uniform microbubble liquid.

[0072] The throat inner diameter of the central foaming channel 111a and the throat inner diameter of the edge foaming channel 111b can be the same or different. For example, the throat inner diameter of the edge foaming channel 111b can be larger than that of the central foaming channel 111a. This results in relatively low throat resistance in the edge foaming channel 111b, which is beneficial for the passage of low-speed liquids.

[0073] Optionally, in at least one radial direction of the bubbler 10, a second flow channel 112 is provided on both sides of the central foaming flow channel 111a.

[0074] For example, such as Figure 2 As shown, there are seven first flow channels 111 and two second flow channels 112. One first flow channel 111 (i.e., the central foaming flow channel 111a) is located at the center of the bubbler 10. The other six first flow channels 111 (i.e., the edge foaming flow channels 111b) and two second flow channels 112 are arranged at intervals along the circumference of the bubbler 10 and surround the central foaming flow channel. The two second flow channels 112 are located on either side of the central foaming flow channel 111a. Of course, the number and arrangement of the first flow channels 111 and the second flow channels 112 are not limited to this.

[0075] In one embodiment, the bubbler 10 further includes a flow-dispersing element located downstream of the liquid outlet surface 10b. The flow-dispersing element can agitate and mix the liquid output from the liquid outlet surface 10b, resulting in a more uniform microbubble liquid. The structure of the flow-dispersing element may include, but is not limited to, a ring-shaped structure, a plate-shaped structure, a fan-shaped structure, or other structures, as long as they achieve the desired flow-dispersing effect.

[0076] In one embodiment, the bubbler 10 further includes a bubble-breaking component located downstream of the liquid outlet surface 10b. By incorporating the bubble-breaking component, it serves two purposes: firstly, it turbulences the flow, resulting in a more uniform microbubble liquid; secondly, it further shears and breaks down the microbubbles in the liquid, forming smaller microbubbles, thereby further enhancing the microbubble effect. The bubble-breaking component can have various shapes, including but not limited to mesh structures, spiral shear structures, or other structures, as long as they effectively turbulence and shear the bubbles.

[0077] In related technologies, most microbubble generation systems use an air pump to directly inject air into the dissolved gas tank. This requires a high sealing pressure from the air pump. When the inlet pressure is too high, the air pump cannot inject air into the dissolved gas tank, resulting in a significant decrease in the dissolved gas effect. Some solutions use a water flow cut-off method to inject air into the dissolved gas tank, that is, closing the water flow cut-off valve when injecting air. This causes the water flow to drop sharply for a short time, and then recover after a few seconds. This makes the water flow output unstable, and the water flow fluctuation is noticeable, affecting the user experience.

[0078] In addition, some related technologies include a water inlet pipe at the inlet of the dissolved gas tank. This water inlet pipe is constructed as a single reducing pipe (e.g., a Venturi tube), with a suction pipe located at or near the minimum diameter of the reducing pipe. Gas is then drawn into the dissolved gas tank via the suction pipe and the water inlet pipe. This approach uses a single reducing pipe to supply both gas and liquid to the dissolved gas tank. According to Bernoulli's equation, when liquid flows through the narrowest part of the reducing pipe (e.g., the throat of a Venturi tube), the flow velocity is inversely proportional to the cross-sectional area. The smaller the cross-sectional area at the narrowest point, the higher the flow velocity and the lower the local pressure, thus creating a stronger vacuum and promoting gas intake. Therefore, to improve suction capacity, the narrowest part of the reducing pipe needs to be designed to be very small. However, if the narrowest part is too small, it will restrict flow and cause a significant increase in liquid flow resistance, reducing the liquid flow rate and affecting the liquid delivery capacity. Therefore, it is impossible to simultaneously achieve good gas intake and high-flow-rate liquid delivery.

[0079] In one embodiment, the first branch channel 302a is configured to generate a low-pressure zone when fluid passes through it, and the air inlet 3061 is at least partially oriented towards this low-pressure zone. This reduces the injection pressure at the air inlet 3061, making it easier for external gas to enter the first branch channel 302a, thereby further improving the dissolved gas effect. Simultaneously, because the second branch channel 302b continuously delivers liquid, the liquid flow rate output by the fluid conveying component 30 does not drop abruptly, which helps maintain a large liquid flow rate, thus meeting high flow rate requirements. In this way, the difficulty of injection is reduced, the dissolved gas effect is improved, and a high flow rate output is guaranteed.

[0080] The first branch channel 302a is constructed to create a low-pressure zone when fluid passes through it. The air inlet 3061 faces this low-pressure zone, thus reducing the injection pressure and allowing external gas to enter the first branch channel 302a more easily, thereby improving its dissolved gas effect. For example, the first branch channel 302a can be designed as a variable-diameter channel (e.g., a Venturi channel). According to Bernoulli's principle, when fluid passes through a variable-diameter channel, the flow velocity increases and the static pressure decreases as the channel narrows, creating a low-pressure zone. Alternatively, the first branch channel 302a can also be designed as a swirling channel. When fluid passes through a swirling channel, the pressure decreases in the high-speed rotating region (e.g., the center of the swirling flow), forming a low-pressure zone, while the pressure is higher at the outer edge. Of course, the first branch channel 302a can also be designed as other irregularly shaped channels, which are not specifically limited here. The second branch channel 302b includes, but is not limited to, a straight-through channel of equal diameter, a variable-diameter channel, a curved channel, etc., and its channel shape is not specifically limited. In addition, the number of the first branch channel 302a and the second branch channel 302b can be one, two or more, and is not specifically limited here. The first branch channel 302a and the second branch channel 302b can be coaxially arranged (for example, a sleeve structure can be adopted, so that the first branch channel 302a is arranged around the second branch channel 302b, or the second branch channel 302b is arranged around the first branch channel 302a), or they can be arranged non-coaxially (for example, the first branch channel 302a and the second branch channel 302b extend in parallel, or have a certain inclination angle); the first branch channel 302a and the second branch channel 302b can be integrated on the same component (for example, the first branch channel 302a and the second branch channel 302b are integrated on the diversion part 32), or they can be respectively arranged on different components (for example, the first branch channel 302a is formed in the first diversion pipe, and the second branch channel 302b is formed in the second diversion pipe), without specific limitations here.

[0081] Optionally, such as Figure 7As shown, the first branch channel 302a is constructed as a Venturi channel, and the second branch channel 302b is constructed as a straight-through channel. The first branch channel 302a, being a Venturi channel, has its throat as the narrowest part of the Venturi channel. When fluid passes through, a low-pressure area is generated at the throat. The air inlet 3061 faces the throat to reduce the injection pressure, facilitating the injection of gas from an external air source into the first branch channel 302a. Understandably, a single Venturi channel cannot simultaneously satisfy both the throat pressure reduction effect and the high flow rate. The smaller the throat diameter, the better the throat pressure reduction effect, but the lower the flow rate through the throat. In this design, since the first branch channel 302a and the second branch channel 302b are connected in parallel, and the second branch channel 302b is a straight-through channel with lower flow resistance, it can meet the high-flow-rate delivery requirements. Therefore, the throat of the first branch channel 302a can be designed to be very small to achieve better pressure reduction and further enhance gas injection performance, thus better balancing pressure reduction and high-flow-rate requirements. Of course, in some embodiments, the second branch channel 302b can also be constructed as a Venturi channel, with its throat size larger than that of the first branch channel 302a, achieving similarly good flow characteristics.

[0082] Compared to existing technologies that directly pump air into the dissolved gas tank using an air pump, and those that intermittently close the water flow shut-off valve to improve the pumping effect, the present invention delivers gas and liquid into the dissolved gas tank 40 via a fluid conveying component 30. Since the fluid conveying component 30 has a first branch channel 302a and a second branch channel 302b connected in parallel, the first branch channel 302a is configured to generate a low-pressure zone when fluid passes through it. The air inlet 3061 is at least partially oriented towards this low-pressure zone, thus reducing the injection pressure at the air inlet 3061. The reduced gas injection difficulty allows external gas to more easily enter the first branch channel 302a, which then transports the gas to the dissolved gas tank 40. This allows more gas to enter the dissolved gas tank 40, improving the dissolved gas effect and solving the problem of excessive pressure preventing gas injection when directly pumping gas into the dissolved gas tank 40. On the other hand, the second branch channel 302b continuously supplies liquid to the dissolved gas tank 40, increasing the liquid inflow and ensuring a consistent liquid outflow, enabling high-flow-rate liquid delivery to downstream pipelines. Furthermore, the absence of intermittent closure of the water flow shut-off valve during gas injection prevents sudden drops in liquid flow, ensuring stable liquid flow and continuous, stable high-flow-rate output.

[0083] Compared to the above-mentioned solution of using a self-priming variable diameter pipe to introduce air into the dissolved gas tank, the fluid conveying component of the present invention has a first branch channel 302a and a second branch channel 302b connected in parallel. On the one hand, the first branch channel 302a is configured to generate a low-pressure zone when fluid passes through it, and the air inlet 3061 is at least partially oriented towards the low-pressure zone. This reduces the injection pressure of the air inlet 3061, lowers the injection difficulty, and makes it easier for external gas to enter the first branch channel 302a. On the other hand, the second branch channel 302b can continuously deliver liquid to ensure a large flow rate output. Furthermore, because of the flow through the second branch channel 302b, when the first branch channel 302a is constructed as a variable diameter channel, the narrowest part of the first branch channel 302a can be designed to be smaller, which is more conducive to reducing the injection pressure and improving the air intake effect. Thus, by having the first branch channel 302a and the second branch channel 302b designed in parallel, the contradiction between the air intake capacity and the liquid delivery capacity of the traditional single intake reducer can be well balanced, and the requirements of good air intake effect and large flow rate liquid delivery can be met at the same time.

[0084] The microbubble generating system 100 delivers gas and liquid to the dissolved gas tank 40 via the fluid conveying component 30 upstream of the dissolved gas tank 40. This reduces the difficulty of injecting gas into the dissolved gas tank 40, improves the dissolved gas effect, and achieves a large flow rate output, allowing the dissolved gas tank 40 to deliver more dissolved gas liquid to the downstream aerator 10. Simultaneously, the downstream aerator 10 achieves both good foaming effect and a large flow rate output. Thus, through these multiple functions, the microbubble generating system 100 and water-using equipment (such as a water heater 1000) equipped with it can provide users with a large flow rate of microbubble liquid, thereby enhancing the user experience.

[0085] There are multiple arrangements for the first branch channel 302a and the second branch channel 302b.

[0086] In one embodiment, the second branch channel 302b is at least partially arranged around the periphery of the first branch channel 302a. For example, the cross-section of the second branch channel 302b may be annular, such that the second branch channel 302b is arranged around the periphery of the first branch channel 302a. As another example, the cross-section of the second branch channel 302b may be arc-shaped, such that the second branch channel 302b is partially arranged around the periphery of the first branch channel 302a. Yet another example, the second branch channel 302b may extend spirally along the axial direction of the first branch channel 302a and be fitted around the periphery of the first branch channel 302a.

[0087] like Figure 7As shown, in some embodiments, multiple second branch channels 302b are arranged circumferentially along the first branch channel 302a, and the first branch channel 302a is located within the area enclosed by the multiple second branch channels 302b. By providing multiple second branch channels 302b, it is beneficial to further increase the liquid flow rate to better meet the demand for large flow rates. Furthermore, while ensuring that the overall flow rate remains unchanged, replacing a single second branch channel 302b with multiple independent and spaced second branch channels 302b makes the flow cross-sectional size of each second branch channel 302b relatively small. This avoids the second branch channel 302b having an excessively large flow cross-sectional size, resulting in insufficient resistance, and avoids the resistance difference between the first branch channel 302a and the second branch channel 302b being too large, resulting in uneven flow distribution. This ensures that the liquid can enter the first branch channel 302a and the second branch channel 302b more evenly.

[0088] like Figure 6 and Figure 7 As shown, in one embodiment, the fluid transport member 30 includes an inlet section 31, a diverter section 32, and an outlet section 33. The liquid inlet section 31 is provided with a liquid inlet 301 and a liquid inlet channel 304; the diversion section 32 is provided on the side of the liquid inlet section 31 away from the liquid inlet 301, the diversion section 32 is provided with a diversion channel 302 and an air inlet 306, the liquid inlet 301 is connected to the inlet end of each branch channel of the diversion channel 302 via the liquid inlet channel 304, one end of the air inlet 306 penetrates the inner wall of the first branch channel 302a to form an air inlet 3061, and the other end penetrates the surface of the diversion section 32 to form a through port 3062; the liquid outlet section 33 is provided on the end of the diversion section 32 away from the liquid inlet section 31, the liquid outlet section 33 is provided with a liquid outlet 303 and a liquid outlet channel 305, the outlet end of each branch channel of the diversion channel 302 is connected to the liquid outlet 303 via the liquid outlet channel 305.

[0089] In this embodiment, the inlet section 31, the diverter section 32, and the outlet section 33 can be independent components assembled together. Alternatively, the diverter section 32 can be integrally formed with at least one of the inlet section 31 and the outlet section 33. Optionally, the inlet section 31, the diverter section 32, and the outlet section 33 can be integrally formed, which simplifies the manufacturing process, ensures the overall structural strength, and avoids problems such as poor sealing and leakage that can occur with assembled structures. The inlet section 31 and the outlet section 33 are hollow tubular structures, such as circular tubes. One end of the inlet section 31 is provided with an inlet port 301, and an inlet flow channel 304 is formed inside the inlet section 31. One end of the outlet section 33 is provided with an outlet port 303, and an outlet flow channel 305 is formed inside the outlet section 33. One end of the diversion section 32 is connected to the end of the liquid inlet section 31 away from the liquid inlet 301, and the other end of the diversion section 32 is connected to the end of the liquid outlet section 33 away from the liquid outlet 303. Each branch channel of the diversion channel 302 (e.g., the first branch channel 302a and the second branch channel 302b) is integrated onto the diversion section 32, resulting in a more compact overall structure and smaller footprint. This also avoids complex piping structures and simplifies the manufacturing process. For example, multiple parallel channels can be simultaneously constructed on the same component through injection molding to simplify the manufacturing process.

[0090] like Figure 7 As shown, in one embodiment, the air inlet 306 has a first section 306a and a second section 306b arranged and connected from the through opening 3062 toward the air inlet 3061, and the inner diameter of the first section 306a is larger than the inner diameter of the second section 306b.

[0091] In this embodiment, the air inlet 306 has a stepped hole structure. The inner diameter of the first section 306a of the air inlet 306 is relatively large, which is beneficial for connection with external pipelines. For example, the outlet end of the air pump 50 can be inserted into the first section 306a and connected to the first branch channel 302a via the second section 306b. The diameter of the second section 306b is smaller than the diameter of the first section 306a, allowing the gas to enter the first branch channel 302a at a higher flow rate, thereby fully mixing with the liquid in the first branch channel 302a to further improve the dissolved gas effect.

[0092] To facilitate connection between external piping and the fluid transport component 30, the inner peripheral wall of the first orifice section 306a may optionally be provided with internal threads for connecting the piping. Alternatively, the outer peripheral walls of the inlet section 31 and the outlet section 33 may optionally be provided with external threads for connecting the piping.

[0093] like Figure 5As shown, in one embodiment, the microbubble generating system 100 further includes an air pump 50, which is connected to the air inlet 3061 of the fluid conveying component 30 and is used to inject gas into the first branch channel 302a. In this embodiment, the air pump 50 injects gas into the first branch channel 302a. Since the air pump 50 can generate a certain pressure, it is more conducive to injecting more gas into the first branch channel 302a, which is beneficial to further enhance the gas dissolving effect.

[0094] like Figure 5 As shown, the present invention also proposes a water heater 1000, including a microbubble generating system 100. The specific structure of the microbubble generating system 100 is as described in the above embodiments. Since the water heater 1000 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.

[0095] The water heater 1000 can be a gas water heater, an electric water heater, or other types of water heater. Taking a gas water heater 1000 as an example, the water heater 1000 includes a microbubble generating system 100 and a heat exchange system 200. The heat exchange system 200 may include an inlet pipe, a heat exchanger, and an outlet pipe connected in sequence. A burner may be provided on one side of the heat exchanger. The high-temperature flue gas generated by the burner flows towards the surface of the heat exchanger. Cold water transported by the inlet pipe flows into the heat exchanger and exchanges heat with the high-temperature flue gas to form hot water. The hot water is output through the outlet pipe to the microbubble generating system 100, where microbubble hot water is generated and then output to the user's water outlet (e.g., a shower head) to improve the user's bathing experience. Optionally, the water heater 1000 also includes a booster pump 300, which is installed on the inlet pipe to increase the inlet water pressure and further meet the demand for large flow rates.

[0096] The above description is merely an exemplary embodiment of the present invention and does not limit the scope of protection of the present invention. Any equivalent structural transformations made based on the technical concept of the present invention and the contents of the specification and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present invention.

Claims

1. A microbubble generating system, characterized in that, include: A bubbler having an inlet surface, an outlet surface, and multiple liquid passages, each liquid passage penetrating both ends of the inlet surface and the outlet surface respectively. The multiple liquid passages include at least a first flow channel and a second flow channel, both of which are constructed as variable-diameter channels. The cross-sectional area of ​​the narrowest part of the first flow channel is smaller than the cross-sectional area of ​​the narrowest part of the second flow channel. A dissolved gas system includes a liquid delivery pipeline, a fluid conveying component, and a dissolved gas tank. The fluid conveying component has an inlet, a branch channel, and an outlet connected in sequence. The branch channel includes at least a first branch channel and a second branch channel arranged in parallel. The wall of the first branch channel is provided with an inlet for introducing external gas. The outlet is connected to the dissolved gas tank. The outlet of the dissolved gas tank is connected to the bubbler via the liquid delivery pipeline. The first flow channel includes a first tapered section, a first throat, and a first expanding section arranged and connected in sequence. The wide end of the first tapered section penetrates the liquid inlet surface, and the wide end of the first expanding section penetrates the liquid outlet surface. The first throat is a straight section of equal diameter extending from the narrow end of the first tapered section toward the narrow end of the first expanding section. The length of the first tapering section is not less than 1.5 mm and not more than 3.5 mm; the length of the first throat is not less than 0.7 mm and not more than 1.2 mm; the expansion angle of the first expanding section is not less than 2 degrees and less than 5 degrees. The fluid transport component includes an inlet section and a diversion section. The inlet section has an inlet port and an inlet channel. The diversion section is located on the side of the inlet section away from the inlet port and has a diversion channel. The inlet port is connected to the inlet ends of each branch channel of the diversion channel via the inlet channel. The first branch channel is configured to generate a low-pressure zone when fluid passes through it, and the inlet port is at least partially oriented towards the low-pressure zone. The second branch channel is at least partially arranged around the periphery of the first branch channel. Alternatively, multiple second branch channels are arranged at circumferential intervals along the first branch channel, and the first branch channel is located within the area enclosed by the multiple second branch channels. The first branch channel is arranged opposite to the central area of ​​the inlet channel. The second branch channel is constructed as a straight channel.

2. The microbubble generating system as described in claim 1, characterized in that, Both the first and second flow channels are constructed as Venturi flow channels, with the throat inner diameter of the first flow channel being smaller than that of the second flow channel.

3. The microbubble generating system as described in claim 1, characterized in that, At least a portion of the first flow channel is disposed near the center of the bubbler; And / or, at least a portion of the second flow channel is provided near the edge of the bubbler.

4. The microbubble generating system as described in claim 3, characterized in that, Both the first flow channel and the second flow channel are provided in multiple ways. The multiple first flow channels include a central foaming flow channel located at the center of the foamer and an edge foaming flow channel near the edge of the foamer. The edge foaming flow channel and the second flow channel are arranged at intervals along the circumference of the foamer.

5. The microbubble generating system as described in claim 4, characterized in that, The second flow channel is provided on both sides of the central foaming flow channel in at least one radial direction of the foamer.

6. The microbubble generating system as described in claim 1, characterized in that, The bubbler also has a flow-dispersing element located downstream of the liquid outlet surface; And / or, the bubbler further includes a bubble-breaking element located downstream of the liquid outlet surface.

7. The microbubble generating system according to any one of claims 1 to 6, characterized in that, The first branch channel is constructed as a Venturi channel.

8. A water heater, characterized in that, Includes the microbubble generating system as described in any one of claims 1 to 7.

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