CN110652893A - Microbubble generating device and bubble segmentation component - Google Patents

Abstract

The present application provides a microbubble generating device, and also provides a bubble dividing element for generating microbubbles. The micro-bubble generating device includes: a gas-liquid mixer, a bubble generator and a bubble filter; the gas-liquid mixer is provided with an air inlet and a liquid inlet for mixing gas and liquid, and its output end outputs gas and liquid mixture; the bubble generator is connected to the gas-liquid mixer, and has a water inlet and a water outlet, and the water inlet is connected to the output end of the gas-liquid mixer; the bubble generator is provided with a bubble dividing element , the bubble dividing element includes at least two layers of bubble piercing layers, the bubble piercing layers include tips facing the direction of the water inlet, and the tips of adjacent layers are staggered from each other; one end of the bubble filter is connected to the bubbles The water outlet of the generator is provided with a filter layer inside, and the other end is the microbubble water outlet of the microbubble generating device.

Description

A micro-bubble generating device and a bubble dividing element

technical field

The invention relates to the field of micro-nano technology, in particular to a micro-bubble generating device. The application also relates to a bubble dividing element for generating microbubbles.

Background technique

Microbubbles are tiny bubbles with a diameter of less than 50 microns that are generated when bubbles occur. After the occurrence of microbubbles, the bubbles shrink by themselves. During this process, the rising speed of the bubbles becomes slower, so the melting efficiency is high. In addition, the microbubbles are It also has the characteristics of large specific surface area, high gas content and surface charge.

In industry, microbubbles play an important role in drag reduction at the solid-liquid interface. Filling the same nanobubbles all over the inner wall of the liquid transfer pipeline will reduce the friction of the solid-liquid interface during the liquid transfer process, thereby saving energy and cost. Meanwhile, microbubbles can be used in daily life. Because many man-made products and natural resources are formed by mixing substances, in some cases we want these substances to remain mixed, and in other cases we need to separate them. At this time, we can use microbubbles to stabilize oily substances and water for a longer time, which can make oil separation from oil sands more economical and efficient.

At present, the occurrence of microbubbles is mainly divided into the following categories:

(1) Typical pressure-dissolving micro-bubble generating device: after the gas-liquid mixture is added to a certain pressure in a pressurized tank, the gas is dissolved in the liquid at a saturated concentration, and the pressure is suddenly reduced by using a pressure reducing valve. The gas in the phase is separated out, resulting in the generation of microbubbles;

(2) Ultrasonic generation of microbubbles: Ultrasonic generation of microbubbles mainly utilizes the phenomenon of ultrasonic cavitation. High-frequency sound waves propagate in the liquid in the form of longitudinal waves. When the sound intensity exceeds the liquid static pressure value, the liquid medium will be destroyed. The integrity of the liquid leads to the appearance of cavities in the liquid. When the cavities are formed, they are generally in a vacuum state, and the gas dissolved in the water will quickly enter the cavities to form micro-bubbles;

(3) Microporous foaming technology: Microporous foaming technology is a microporous structure formed by sintering certain media (such as metallurgical powder, ceramics or plastics) as materials, mixed with an appropriate amount of binder, and sintered at high temperature. , when the compressed gas passes through the microporous medium, it is cut into micro-nano bubbles by the micropores.

However, the above-mentioned existing devices and methods for generating microbubbles all have some problems. The distribution and size of the microbubbles generated by using the above-mentioned device (1) are directly determined by the pressure in the pressure tank, and the variables are single. Under certain conditions, Microbubbles that meet production requirements cannot be generated. The above methods (2) and (3) both have the disadvantages of high manufacturing difficulty, discrete bubble size and high energy consumption. Therefore, it is necessary to optimize the design of the micro-bubble generating device to improve the effect of micro-bubble generation and make it more industrially practical.

SUMMARY OF THE INVENTION

The present application provides a micro-bubble generating device. The present application also provides a bubble dividing element for generating microbubbles.

The microbubble generating device provided in this application includes:

Gas-liquid mixer, bubble generator;

The gas-liquid mixer is provided with an air inlet and a liquid inlet for mixing gas and liquid, and the output end outputs the gas-liquid mixture;

The bubble generator is connected to the gas-liquid mixer, and has an inlet and an outlet, and the inlet is connected to the output end of the gas-liquid mixer; the bubble generator is provided with a bubble dividing element, and the bubble divides The element comprises at least two layers of bubble piercing layers, the bubble piercing layers include tips facing the direction of the water inlet, and the tips of adjacent bubble piercing layers are staggered from each other; the gas-liquid mixture passing through the bubble dividing element passes through the outflow from the outlet.

Preferably, the micro-bubble generating device includes a bubble filter, one end of the bubble filter is connected to the outlet of the bubble generator, and a filter layer is arranged inside the bubble filter, and the gas-liquid mixture passing through the bubble filter is removed from the bubble filter. output at the other end.

Preferably, the tips of the adjacent bubble-piercing layers are staggered from each other, and the specific structure is as follows: the tip of the bubble-piercing layer located in the downstream position faces the bubble outlet of the upstream bubble-piercing layer.

Preferably, the inside of the bubble generator is provided with a bubble dividing element, including: at least two bubble dividing elements are provided inside the bubble generator, and the bubble dividing element divides the inside of the bubble generator into at least three layers.

Preferably, the bubble generator is provided with two bubble dividing elements, including: the purpose of each of the bubble dividing elements is different, and the purpose of each bubble dividing element is different according to the position of the liquid flow, And the ones located downstream are larger than the ones located upstream.

Preferably, the mesh of the bubble dividing element located most downstream is greater than 300.

Preferably, the bubble generator adopts a pressure tank.

Preferably, an annular groove is provided inside the pressure tank for installing the air bubble dividing element, and the number of the annular groove is consistent with the number of the air bubble dividing element.

Preferably, the pressure tank adopts a diaphragm type pressure tank.

Preferably, the bubble generator is a pipe.

Preferably, the pipeline is a spiral pipeline.

Preferably, the bubble dividing elements are arranged layer by layer in a longitudinal section centered on the central axis of the helical pipe.

Preferably, the bubble dividing element comprises at least two layers of bubble piercing layers, the tips of each layer of bubble piercing layers face the same side, and the tips of adjacent bubble piercing layers are staggered from each other.

Preferably, the tips of the adjacent bubble-piercing layers are staggered from each other, and the specific structure is as follows: the tip of the bubble-piercing layer located in the downstream position faces the bubble outlet of the upstream bubble-piercing layer.

Preferably, the mesh of the bubble dividing element is greater than 300.

Compared with the prior art, the present application has the following advantages:

The application provides a microbubble generating device for generating microbubbles, including: a gas-liquid mixer and a bubble generator;

The gas-liquid mixer is provided with an air inlet and a liquid inlet for mixing gas and liquid, and its output end outputs a gas-liquid mixture; the bubble generator is connected to the gas-liquid mixer and has an inlet and an outlet, The inlet is connected to the output end of the gas-liquid mixer; the bubble generator is provided with a bubble dividing element, and the bubble dividing element comprises at least two layers of bubble piercing layers, the The tips in the direction of the inlet, and the tips of the adjacent bubble piercing layers are staggered from each other; the gas-liquid mixture passing through the bubble dividing element flows out through the outlet. This solution abandons the traditional pressure-dissolving micro-bubble generating device and micro-bubble pore-forming technology, and uses the bubble dividing element composed of the bubble piercing layer to directly process the bubbles in the gas-liquid mixture. At the same time as the bubble dividing element, considering the characteristics of the flowability and irregular shape of the bubbles, the physical structure of the bubble piercing layer is fully utilized, so that the gas-liquid mixture can flow through the multi-layer bubble dividing element to form a bubble containing microbubbles. Liquid, this structure setting not only has low energy consumption, but also produces uniform size of microbubbles, and at the same time greatly improves the production efficiency of microbubbles.

Description of drawings

1 is a schematic structural diagram of a microbubble generating device provided in a first embodiment of the present application;

2 is a schematic structural diagram of a bubble generator provided by the first embodiment of the present application;

FIG. 3 is a partial structural schematic diagram of the bubble dividing element provided by the first embodiment of the present application.

Detailed ways

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar promotions without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

The first embodiment of the present application provides a micro-bubble generating device. Please refer to FIG. 1 , which is a schematic diagram of the first embodiment of the present application. The micro-bubble generating device includes: a gas-liquid mixer 101 and a bubble generator 102 And the bubble filter 103.

The gas-liquid mixer 101 is provided with an air inlet 1011 and a liquid inlet 1012 for mixing gas and liquid, and the output end outputs the gas-liquid mixture, and enters the bubble generator through the inlet 1021 of the bubble generator 102, the gas-liquid mixture forms microbubbles in the bubble generator, enters the bubble filter 103 through the outlet 1022 of the bubble generator, and the bubble filter filters the microbubbles with larger diameters, and finally Output the microbubbles that meet the requirements. The gas-liquid mixer is the basis for the micro-bubble generating device to generate micro-bubbles. The pressure in the gas-liquid mixer can be appropriately increased to fully mix the gas and the liquid, that is, make the gas in the gas-liquid mixer. The liquid mixer exists in the form of air bubbles in the liquid.

As shown in FIG. 2, which is a schematic structural diagram of the bubble generator described in the first embodiment of the application, the bubble generator has an inlet 1021 and an outlet 1022, which are respectively used to receive the gas-liquid mixture from the gas-liquid mixer , and flow out the treated gas-liquid mixture. In addition, a bubble dividing element 104 is also arranged inside the bubble generator.

In the gas-liquid mixture, gas mostly exists in the form of large bubbles, and the purpose of the microbubble generating device provided in this application is to make these large bubbles into microbubbles that meet the requirements, so as to meet people's daily needs and Therefore, the bubble generator 102 is provided with a bubble dividing element 104 in the present application, the gas-liquid mixture flows through the bubble dividing element 104, and under the action of the bubble dividing element 104, the large The bubbles are divided into microbubbles that meet the requirements.

Hereinafter, we will describe the bubble dividing element 104 described in this application in detail in conjunction with the bubble generator.

As shown in FIG. 2 , the bubble dividing element 104 is disposed inside the bubble generator, and the bubble dividing element includes at least two layers of bubble piercing layers 1041 , and the bubble piercing layers 1041 include a direction toward the water inlet. , and the tips of adjacent bubble-piercing layers are staggered from each other.

It can be seen that the bubble dividing element 104 is composed of the bubble piercing layer 1041. In addition, since the function of the bubble dividing element 104 is to divide large bubbles in the gas-liquid mixture, the bubble dividing element must exist The bubble inlet 1042 and the bubble outlet 1043, the structure of the bubble inlet 1042 and the bubble outlet 1043 are similar to the structure of the screen, and the bubbles entering the bubble inlet 1042 are not untreated bubbles, but The bubbles having smaller diameters relative to the larger bubbles that have been segmented by the lowermost tip of the bubble segmenting element 104 .

In addition, since the bubbles are irregular and flowable in the liquid, in order to avoid the problem that the bubbles with larger diameters can pass through the bubble inlet without being divided during the flow process, in this embodiment, a bubble dividing element is used. The multi-layer bubble piercing layer is used for the purpose of dividing the bubbles in the gas-liquid mixture multiple times to prevent the bubbles with larger diameters from directly flowing out of the bubble outlet.

As shown in FIG. 3 , which is a partial structural schematic diagram of the bubble dividing element 104 described in the first embodiment of the application, since the bubble dividing element is constructed of a bubble piercing layer, the bubble inlet 1042 of the bubble dividing element is and the bubble outlet 1043 respectively correspond to the bubble inlet of the most upstream bubble piercing layer and the bubble outlet of the most downstream bubble piercing layer, the bubble piercing layer 1041 constitutes the bubble separating element 104 , it is necessary to align the tip of the downstream bubble piercing layer with the bubble outlet of the upstream piercing layer. During the flow of the gas-liquid mixture, if bubbles with larger diameters enter the bubble outlet of the lower bubble piercing layer, they will also be cut by the tip of the upper bubble piercing layer.

That is to say, when the gas-liquid mixture flows from the upstream to the bubble dividing element, the large bubbles in the gas-liquid mixture first contact the tip of the bubble piercing layer located at the most upstream of the bubble dividing element 104, and are pushed by the tip. Puncture the large bubbles to split into several smaller diameter bubbles, and then flow out from the respective bubble outlets of the most upstream bubble piercing layer, because the tip of the downstream bubble piercing layer is facing the The bubble outlet of the most upstream bubble piercing layer, therefore, when the bubbles flowing out of the bubble outlet of the most upstream bubble piercing layer do not conform to the diameter allowed by the bubble dividing element, the bubbles will follow the gas-liquid mixture. When the flow direction continues to contact the tip of the downstream bubble piercing layer, the bubbles continue to decompose, pass through two or more layers of bubble piercing layers, and finally flow out from the bubble outlet of the most downstream bubble piercing layer 1041, The air bubbles are basically all air bubbles that meet the size requirements of micro-bubbles; of course, in the above process, it is not excluded that the air bubbles divided into small air bubbles are combined into large air bubbles. In addition, the above-mentioned bubble segmentation process needs to flow from the upstream to the downstream relatively quickly with the gas-liquid mixture under a certain pressure. It should be noted that the structure of the bubble dividing element is not limited to being constructed layer by layer by the bubble piercing layer with a tip. Any element that can divide the bubble, or under the action of an external force, can be separated by a certain element. The elements that make the bubbles split according to a certain rule in the moving direction can be referred to as bubble dividing elements, and none of them deviate from the core of the present application. In addition, the bubble dividing elements can also be a whole. For example, the air bubble dividing element may be constructed by at least two layers of screen meshes, and the non-mesh portion of the upper layer of the mesh screen corresponds to the mesh portion of the lower layer of the screen mesh. These are simple changes to the structure of the bubble dividing element described in this embodiment, do not deviate from the core of the present application, and are all within the protection scope of the present application.

In addition, microbubbles are microbubbles having a diameter of 50 micrometers (μm) or less that are generated when bubbles are generated. Therefore, in order to realize the generation of micro-bubbles, the bubble piercing layer should be at least 300 meshes, and the area of the tip of the bubble piercing layer should also be much smaller than 50 micrometers (μm) to prevent the tip from being unable to pierce the bubbles The problem. In addition, if the bubble piercing layer that meets the conditions for micro-bubble generation is directly used to construct the bubble segmenting layer, the bubbles with larger diameters directly contact the bubble segmenting layer and receive uniform force, which will cause the bubble segmenting element to fail to pierce the bubble segment. If the bubbles with larger diameters are broken, the expected effect cannot be achieved, and the bubble dividing element will even be blocked.

Therefore, the bubble generator is provided with at least two bubble dividing elements, and the bubble dividing elements divide the inside of the bubble generator into at least three layers. The meshes of each of the bubble dividing elements are different, and the meshes of the respective bubble dividing elements are different according to the position of the liquid flow, and the meshes located downstream are larger than the meshes located upstream.

The purpose here is a unit of measurement, which refers to the number of holes per inch of the screen. Since the bubble dividing element is composed of a bubble piercing layer, the purpose in this application specifically refers to the bubble piercing per inch. The number of layer bubble openings, for example: 50 mesh means that the number of holes per inch is 50, 500 mesh means that the number of holes per inch is 500, the higher the number, the more holes. In addition, in addition to indicating the holes of the screen, it is also used to indicate the particle size of the particles that can pass through the screen. The higher the mesh number, the smaller the particle size. my country uses the American standard, and the mesh size comparison table of the American Taylor standard sieve, please refer to the following table:

Mesh (mesh) Micron (μm) Mesh (mesh) Micron (μm) 200 74 325 45 230 62 400 38 240 61 500 25 250 58 600 twenty three 270 53 800 18 300 48 1000 13

In addition, the concepts of upstream and downstream in this embodiment are presented with respect to the direction of liquid flow. Since the bubble generator described in this application has an inlet and an outlet, that is to say, in the bubble generator, all objects with fluid properties in the bubble generator described in this application have the law of motion from the inlet. Flow to the outlet, therefore, we use upstream and downstream to represent the positional relationship of each bubble dividing element, so that readers can more clearly understand the positional relationship of each bubble dividing element in the bubble generator.

In order to enable readers to understand the working principle of the microbubble generating device described in this embodiment more clearly, the following describes the generating process of the microbubble in the device in detail with reference to FIG. 1 , FIG. 2 and FIG. 3 .

Water represents the liquid entering the gas-liquid mixer 101 through the liquid inlet 1012 , air represents the gas entering the gas-liquid mixer 101 through the air inlet 1011 , and the air enters the gas-liquid mixer 101 Afterwards, it fuses with water in the form of bubbles to form a gas-liquid mixture. At this time, the diameter of the bubbles is too large and does not meet the diameter requirements of the microbubbles. After the bubbles are structurally stable in water, ie, after the formation of a gas-liquid mixture. The gas-liquid mixture enters the bubble generator 102 from the inlet 1021 of the bubble generator 102 through a pipeline. At this time, the gas-liquid mixture flows from the inlet 1021 to the outlet 1022 of the bubble generator according to the flow. Movement rules flow.

Since the bubble generator 102 is provided with multiple layers of bubble dividing elements, the gas-liquid mixture composed of air and water will inevitably pass through the bubble dividing elements layer by layer when the bubble generator flows. In the process of passing through the bubble dividing element, the bubbles whose diameter is larger than the screen diameter of the bubble dividing element will inevitably be divided by the bubble dividing element to form bubbles with smaller diameters. And the air is constantly moving, even if the air bubbles in the gas-liquid mixture cannot pass through the air-bubble dividing element after being divided once, it will be carried to the air-bubble dividing element by the continuously flowing gas-liquid mixture until it can pass through the air-liquid mixture. The screen of the bubble dividing element. In addition, since the meshes of each layer of bubble dividing elements in the bubble generator become smaller one by one along the flow direction of the gas-liquid mixture, the diameter of the bubbles of the gas-liquid mixture also becomes smaller and smaller each time the gas-liquid mixture passes through one bubble dividing element , until the diameter of the bubble meets the diameter of the microbubble.

Since the bubbles will be combined by mutual collision, and there is no other device between the most downstream bubble dividing element and the outlet of the bubble generator to prevent this combination process, therefore, the microbubbles generated by the bubble generator In water, there are bound to be bubbles with larger diameters. After the microbubble water is gushed out from the bubble generator, it needs to pass through a bubble filter to filter the bubbles with larger diameters due to the collision between the bubbles, so as to obtain pure microbubble water.

It should be noted that the gases and liquids described in this embodiment are not limited to air and water. In practical applications, different gases and liquids can be selected according to needs. For example, oil and inert gas are selected to be combined. The provided microbubble generating device generates microbubbles dissolved in oil.

Preferably, the bubble generator adopts a pressure tank. The main purpose of using a pressure tank for the bubble generator in this embodiment is to fully integrate the bubbles in the gas-liquid mixture into the liquid to reduce the working pressure of the bubble dividing element; Large flow of liquid containing micro-bubbles, and pressure tanks are often provided with a pressure reducing valve. After the bubble generator completes the process of converting the gas-liquid mixture into micro-bubbles, it is only necessary to open the pressure-reducing valve, and the liquid containing micro-bubbles It will quickly pour out of the microbubble generating device to meet industrial needs. In addition, in order to provide the air bubble dividing element in the pressure tank, an annular groove for installing the air bubble dividing element is provided inside the pressure tank, and the number of the annular groove is the same as the number of the air bubble dividing element. Consistent.

In addition, since the bubble dividing element is arranged in the pressure tank, when considering the pressure tank, it should be preferred that the bubble dividing element can be installed layer by layer inside the tank body and the inner space of the tank body is large. Therefore, when selecting a pressure tank in this embodiment, a diaphragm type pressure tank is selected.

It should be noted that the above selection of the tank body of the bubble generator is only a preferred embodiment of the device. In other embodiments, different tank body structures can be used. For example, the pressure tank can be a bladder type pressure tank according to the actual situation. . These are simple changes to the structure of the device, do not deviate from the core of the present application, and are all within the protection scope of the present application.

In addition, the bubble generator can also be a pipe. In order to arrange more bubble dividing elements in the pipe and save space, the pipe can be set as a spiral pipe. In addition, the bubble dividing elements are arranged layer by layer in a longitudinal section centered on the central axis of the helical pipe.

It can be seen that the gas-liquid mixture passing through the bubble dividing element already has the properties of micro-bubbles, but because the bubble dividing element is not covered with the bubble generator, therefore, at the outlet of the bubble generator and the distance Between the nearest bubble dividing element, there will inevitably be microbubbles colliding with each other and causing microbubbles to fuse with each other. Therefore, in the process of designing the microbubble generating device, it should be considered that these fused and non-conforming The micro-bubble standard bubbles are filtered. Therefore, the first embodiment described in this application further includes a bubble filter 103 .

One end of the air bubble filter 103 is connected to the outlet of the air bubble generator 102, and a filter layer is arranged inside, and the gas-liquid mixture passing through the air bubble filter is output from the other end of the air bubble filter; the filter size of the air bubble filter 103, Only the bubbles that meet the definition of microbubbles can be allowed to pass through, and the bubbles with larger diameters can be blocked until they split into microbubbles and can not flow out.

To sum up, the structure of the micro-bubble generating device provided in this embodiment is ingenious, and the traditional pressure-dissolving micro-bubble generating device and the micro-bubble pore-forming technology are abandoned, and the bubble dividing element composed of the bubble piercing layer is used. The bubbles in the gas-liquid mixture are directly processed, and at the same time, in the process of constructing the bubble dividing element, the flowability and irregular shape of the bubbles are considered, and the physical structure of the bubble piercing layer is fully utilized, so that the After the gas-liquid mixture flows through the multi-layer bubble dividing element, a liquid containing micro-bubbles can be formed. This structural arrangement not only has low energy consumption, but also produces a uniform size of micro-bubbles, and at the same time greatly improves the production efficiency of micro-bubbles.

In the above-mentioned embodiments, a micro-bubble generating device is provided, and correspondingly, the present application also provides a bubble dividing element for generating micro-bubbles. Since the embodiment of the device is basically similar to the embodiment of the bubble dividing element for generating micro-bubbles, the description is relatively simple, and reference may be made to part of the description of the system embodiment for related parts. The device embodiments described below are merely illustrative.

This embodiment is a bubble dividing element for generating microbubbles, including: the bubble dividing element includes at least two layers of bubble piercing layers, the tips of each layer of bubble piercing layers face the same side, and adjacent bubbles pierce The tips of the layers are staggered from each other.

The tips of the adjacent bubble-piercing layers are staggered from each other, and the specific structure is as follows: the tip of the bubble-piercing layer located at the downstream position faces the bubble outlet of the upstream bubble-piercing layer. The mesh of the bubble dividing element is greater than 300.

Although the present application is disclosed above with preferred embodiments, it is not intended to limit the present application. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present application. Therefore, the present application The scope of protection shall be subject to the scope defined by the claims of this application.

Claims (10)

1. A microbubble generation apparatus, comprising:

a gas-liquid mixer and a bubble generator;

the gas-liquid mixer is provided with a gas inlet and a liquid inlet and is used for mixing gas and liquid, and the output end of the gas-liquid mixer outputs a gas-liquid mixture;

the bubble generator is connected with the gas-liquid mixer and is provided with an inlet and an outlet, and the inlet is connected with the output end of the gas-liquid mixer; the bubble generator is internally provided with a bubble dividing element, the bubble dividing element at least comprises two bubble puncturing layers, each bubble puncturing layer comprises a tip facing the inlet direction, and the tips of the adjacent bubble puncturing layers are staggered; the gas-liquid mixture passing through the bubble dividing member flows out through the outlet.

2. The apparatus according to claim 1, comprising a bubble filter, wherein one end of the bubble filter is connected to the outlet of the bubble generator, a filter layer is provided inside the bubble filter, and the gas-liquid mixture passing through the bubble filter is output from the other end of the bubble filter.

3. The apparatus as claimed in claim 1, wherein the tips of the adjacent bubble-puncturing layers are staggered from each other, and the following structure is adopted: the tip of the bubble-puncturing layer located at the downstream position faces the bubble outlet of the upstream bubble-puncturing layer.

4. The apparatus according to claim 1, wherein the bubble generator is internally provided with a bubble dividing element, comprising: at least two bubble dividing elements are arranged in the bubble generator, and the bubble dividing elements divide the interior of the bubble generator into at least three layers.

5. The apparatus according to claim 4, wherein two bubble dividing elements are provided inside the bubble generator, including: the purpose of each of the bubble dividing elements is different, and the purpose of each bubble dividing element is different depending on the position of the liquid flow, and is larger at the downstream than at the upstream.

6. The apparatus according to claim 5, wherein the number of the bubble dividing elements located most downstream is greater than 300.

7. The apparatus according to claim 1, wherein the bubble generator is a pipe.

8. The apparatus according to claim 7, wherein the pipe is a spiral pipe.

9. The apparatus according to claim 8, wherein the bubble dividing member is disposed in a longitudinal section centered on the central axis of the spiral duct.

10. The utility model provides a bubble cut-off element for producing microbubble which characterized in that, bubble cut-off element contains two-layer bubble piercing layer at least, and the tip orientation of every layer bubble piercing layer is with one side, and just the tip of adjacent bubble piercing layer staggers each other.

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