Variable-pitch micro-nano bubble generating device

Abstract

This invention provides a variable pitch micro / nano bubble generator, comprising a housing, an injection chamber, and a rectification chamber. The housing contains the rectification chamber and an injection chamber communicating with it. The injection chamber is used to inject pressurized micro / nano bubble liquid into the rectification chamber. Rectifying blades are installed within the rectification chamber to rectify the micro / nano bubble liquid and cause it to rotate spirally. At least one nozzle is installed at the output end of the rectification chamber to eject the rectified micro / nano bubble liquid. This invention uses continuously spiraling variable pitch rectifying blades to stabilize the flow state of the micro / nano bubble liquid.

Description

Technical Field

[0001] This invention relates to the field of nanobubble generating devices, and particularly to a variable pitch micro / nanobubble generating device. Background Technology

[0002] The state of micron-sized and nano-sized bubbles mixed in water is generally called micro / nanobubbles. Compared to ordinary bubbles, micro / nanobubbles have lower buoyancy and slower rising speed due to their small size, but they can remain in water for a longer time. Their small size also gives them a larger specific surface area, allowing them to better adsorb ions in the medium and form an ion layer on their surface. These micro / nanobubbles show promising potential in river drainage, industrial wastewater treatment, and aquaculture.

[0003] When treating rivers and lakes with varying degrees of pollution, the properties of micro- and nano-bubbles are utilized to enhance dissolved oxygen and oxygen mass transfer in the aquatic environment, restoring dissolved oxygen concentration and promoting microbial oxidation. Micro- and nano-bubbles dissolve rapidly in water, giving them a stronger purification capacity. While effectively purifying water, they also reduce energy consumption. Although micro- and nano-bubbles themselves do not have bactericidal functions in wastewater environments, their collapse promotes the generation of free radicals in the water; for example, hydroxyl radicals can oxidize organic matter in the water. Furthermore, the large specific surface area of ​​micro- and nano-bubbles allows them to adsorb bacteria in the water, reducing bacterial concentration.

[0004] Industrial wastewater discharge has a serious impact on the watershed environment and residents' health. Industrial wastewater contains a wide variety of pollutants, which are highly toxic and difficult to treat. Applying micro-nano bubble technology to wastewater pretreatment can significantly improve the requirements for biochemical influent, help maintain the activity of microorganisms, improve wastewater treatment efficiency, remove organic pollutants and suspended solids, and achieve water purification.

[0005] The application of micro-nano bubble technology in indoor shrimp farming has shown that micro-nano bubbles can accelerate the degradation of particulate matter in the aquaculture water. The micro-nano bubble generator is located at the bottom of the water body, and the jet of air moves horizontally. Deposited particles are impacted by the airflow and suspended in the aquaculture water. Due to the excellent adhesion efficiency of the suspended matter on the surface of the micro-nano bubbles, a large number of particles aggregate on the surface of the microbubble array. These particles, previously deposited at the bottom, enter a suspended state in the water layer, increasing their contact with oxygen in the water, thereby accelerating the biodegradation of the particles and achieving water purification.

[0006] Existing micro-nano bubbles generated by air pumps, micro-nano bubbles generated by cavitation, or bubbles generated by water pumps cannot effectively dissolve gases and cannot produce a sufficient number of uniform micro-nano bubbles. Some micro-nano bubble generating devices are usually simple in structure, and the flow state of the micro-nano bubble liquid produced is unstable. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a variable pitch micro / nano bubble generator, which uses continuously spiral variable pitch rectifier blades to stabilize the flow state of micro / nano bubble liquid.

[0008] The present invention achieves the above-mentioned technical objectives through the following technical means.

[0009] A variable pitch micro / nano bubble generator includes a housing, an injection chamber, and a rectifier chamber. The housing contains a rectifier chamber and an injection chamber that communicates with the rectifier chamber. The injection chamber is used to inject pressurized micro / nano bubble liquid into the rectifier chamber.

[0010] The rectifier cavity is equipped with rectifier blades for rectifying the micro-nano bubble liquid and causing it to rotate in a spiral. At least one nozzle is installed at the output end of the rectifier cavity for spraying out the rectified micro-nano bubble liquid.

[0011] Furthermore, a fixed baffle is installed on the outside of the housing via a fixed bracket. The fixed baffle is located on the spray path of the nozzle and is used to counteract the relative movement of the housing caused by the pressure generated by the micro-nano bubble liquid sprayed out by the nozzle.

[0012] Furthermore, the rectifier blade is a continuous helical blade, which includes a first helical blade and a second helical blade. The first and second helical blades are symmetrically arranged, and the injection cavity is aligned with the connection between the first and second helical blades to generate two micro-nano bubble liquids with different helical directions.

[0013] Furthermore, both the first and second helical blades are variable pitch blades.

[0014] Furthermore, the pitch of the first helical blade and / or the second helical blade gradually decreases along the direction from the injection cavity toward the nozzle.

[0015] Furthermore, the rectifier blade is provided with a through hole along the nozzle axis, and the diameter of the through hole is 1.5-2 times the diameter of the nozzle inner hole.

[0016] Furthermore, the micro-nano bubble liquid is composed of a mixture of gas and liquid, with a gas-to-liquid volume ratio of 1:9.

[0017] Furthermore, the rectifier blades satisfy the following conditions:

[0018]

[0019]

[0020]

[0021]

[0022] In the formula:

[0023] R1 is the blade inlet rim radius, in meters;

[0024] R2 is the blade exit rim radius, in meters.

[0025] β1 is the blade inlet angle, in degrees;

[0026] β2 is the blade exit angle, in degrees;

[0027] Q represents the injection cavity flow rate, in cubic meters per second;

[0028] d4 is the inlet diameter of the injection cavity, in meters (m).

[0029] t represents time in seconds.

[0030] Furthermore, the rectifier blade also satisfies the following condition:

[0031] L1=k3δ

[0032] L2=k4δ

[0033] P n =2.89n 2 -26.87n+73.92

[0034] In the formula:

[0035] L1 is the blade inlet grinding length, in meters;

[0036] L2 is the blade exit polishing length, in meters;

[0037] δ represents the leaf margin thickness, in meters.

[0038] P n The pitch of the nth blade is expressed in meters.

[0039] The beneficial effects of this invention are as follows:

[0040] 1. The variable pitch micro / nano bubble generator of the present invention, wherein the micro / nano bubble liquid is rectified by the rectifier cavity, resulting in stable high-speed swirling and uniformly spraying out the micro / nano bubble liquid.

[0041] 2. The variable pitch micro / nano bubble generator of the present invention can generate high-speed rotating micro / nano bubble liquid by setting variable pitch rectifier blades, which facilitates the micro / nano bubble liquid to be sprayed out from the nozzle.

[0042] 3. In the variable pitch micro-nano bubble generator of the present invention, a fixed baffle is installed on the outside of the shell by a fixed bracket. The fixed baffle is located on the spray path of the nozzle and can counteract the relative movement of the shell caused by the pressure generated by the micro-nano bubble liquid sprayed out by the nozzle. Since the variable pitch micro-nano bubble generator is generally used in water, the fixed baffle can prevent the variable pitch micro-nano bubble generator from moving in the water. Attached Figure Description

[0043] 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. The drawings described below are some embodiments of the present invention. For those skilled in the art, it is obvious that other drawings can be obtained from these drawings without creative effort.

[0044] Figure 1 This is a front view of the variable pitch micro / nano bubble generator described in this invention.

[0045] Figure 2 This is a top view of the variable pitch micro / nano bubble generator described in this invention.

[0046] Figure 3 for Figure 2 The diagram shows a cross-sectional view AA, with B representing the positional relationship between the rectifier blade and the injection cavity.

[0047] Figure 4 This is a front view of the rectifier blade described in this invention.

[0048] Figure 5 This is a three-dimensional view of the rectifier blade described in this invention.

[0049] Figure 6 This is a left view of the rectifier blade described in this invention.

[0050] Figure 7a This is a schematic diagram of the nozzle design described in this invention.

[0051] Figure 7b This is a schematic diagram of the nozzle design according to the present invention.

[0052] Figure 7c This is a schematic diagram of the nozzle design described in this invention.

[0053] Figure 8 These are rectifier blades with different numbers of blades as described in this invention, where a is 1 blade; b is 2 blades; and c is 3 blades.

[0054] Figure 9 The rectifier blade profile described in this invention.

[0055] Figure 10 This is a grinding diagram of the inlet and outlet of the rectifier blade described in this invention.

[0056] Figure 11 This is a comparison curve between the variable pitch micro / nano bubble generator described in this invention and existing technologies.

[0057] In the picture:

[0058] 1-Injection chamber; 11-Injection input end; 12-Injection output end; 2-Rectifying chamber; 22-Rectifying output end; 23-Rectifying blade; 24-Inner wall of rectifying chamber; 25-Outer wall of rectifying chamber; 26-Fixed bracket; 27-Fixed baffle; 3-Nozzle. Detailed Implementation

[0059] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0060] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0061] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0062] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0063] like Figure 1 , Figure 2 and Figure 3 As shown, the variable pitch micro / nano bubble generator of the present invention includes a housing, an injection chamber 1, and a rectifier chamber 2. The housing contains the rectifier chamber 2 and the injection chamber 1, which communicates with the rectifier chamber 2. The injection chamber 1 is used to inject pressurized micro / nano bubble liquid into the rectifier chamber 2. The rectifier chamber 2 is equipped with rectifier blades 23 for rectifying the micro / nano bubble liquid, making the micro / nano bubble liquid flow stably, and causing the micro / nano bubble liquid to rotate in a spiral. At least one nozzle 3 is installed at the output end of the rectifier chamber 2 for spraying out the rectified micro / nano bubble liquid.

[0064] The injection chamber 1 includes an injection input end 11 and an injection output end 12. The injection chamber 1 is used to inject high-speed flowing micro / nano bubble liquid, which is injected from the upper connection point. The rectifier chamber 2 may include a rectifier input end 22, a rectifier output end 22, and rectifier blades 23. The rectifier input end is connected to the injection output end 12 to facilitate the flow of the micro / nano bubble liquid, while the rectifier blades 23 improve the flow state before it reaches the rectifier output end 22. The nozzle 3 is connected to the rectifier output end 22. The injection chamber 1 has internal threads for connecting to pipelines for injecting the micro / nano bubble liquid.

[0065] The rectifying cavity 2 is shaped like a central cylinder with semi-ellipsoids at both ends. The inner wall 24 of this rectifying cavity 2 reduces the flow resistance of the micro / nano bubble liquid, accelerates the flow, and simultaneously causes the micro / nano bubble liquid to rotate at high speed. The smooth surface of the inner wall 24 reduces the rotational energy loss of the micro / nano bubble liquid. Rectifying blades 23 are fixed to the inner wall 24 to improve the flow state of the micro / nano bubble liquid and stabilize the flow.

[0066] The outer wall 25 of the rectifier cavity 2 is provided with multiple fixed supports 26, each with a threaded connection hole. The fixed supports 26 are connected to fixed baffles 27, which reduce the impact of the reverse thrust of the micro / nano bubble nozzle and improve the stability of the spray. Multiple fixed supports can be symmetrically distributed on the left and right sides of the outer wall of the rectifier cavity. The fixed baffles 27 are located on the spray path of the nozzle 3 and are used to counteract the relative movement of the housing caused by the pressure generated by the micro / nano bubble liquid sprayed from the nozzle 3. Since the variable pitch micro / nano bubble generator is generally used in water, the fixed baffles prevent movement of the variable pitch micro / nano bubble generator in the water.

[0067] like Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the rectifier blade 23 is a continuous helical blade, comprising a first helical blade and a second helical blade. The first and second helical blades are symmetrically arranged. The injection chamber 1 is aligned with the connection between the first and second helical blades to generate two micro / nano bubble liquids with different helical directions. Figure 5 As shown in Figure B, when the micro-nano bubble liquid enters the rectifier chamber 2 from the injection chamber 1, it is divided into left and right parts by the rectifier blades 23 and continues to flow.

[0068] Both the first and second helical blades are variable pitch blades. The pitch of the first and / or second helical blades gradually decreases along the direction from the injection chamber 1 to the nozzle 3. The rectifying blade 23 has a through hole along the axial direction of the nozzle 3. The diameter of the through hole is 1.5-2 times the inner diameter of the nozzle, used to accommodate the gas column generated during the injection of the micro-nano bubble liquid. The micro-nano bubble liquid is composed of a gas and a liquid, with a gas-to-liquid volume ratio of 1:9. At this gas-liquid ratio, the mixing effect of the micro-nano bubble liquid is better, thereby ensuring a more ideal injection and adsorption effect.

[0069] The number of blades z of the rectifier blade 23 can be 1, 2, or 3, such as Figure 8 a, b, and c; the rectifier blade 23 may have a certain curvature; the thickness of the rectifier blade 23 is δ = 3 mm; the surface of the rectifier blade 23 is smooth, which can reduce the frictional energy loss of the micro-nano bubble liquid.

[0070] The interface changes at nozzle 3 can alter the fluid pressure and velocity, such as... Figure 7a , 7b Figures 7 and 7c are schematic diagrams of three example nozzle shapes. Figure 7a In this context, the flow channel of nozzle 3 is a straight orifice; Figure 7b In the middle, the nozzle 3 has a tapered orifice in the flow channel; Figure 7cIn this design, the nozzle 3 has a gradually decreasing curvature converging orifice in its flow channel. Due to the Bernoulli effect, this further accelerates the jetting action, resulting in better jetting efficiency. The nozzle can be implemented in many different forms and is not limited to the embodiments described herein.

[0071] Working principle: Micro-nano bubble liquid is injected into the rectifier cavity 2, and rectifier blades 23 are fixed inside the rectifier cavity 2. Under the guidance of rectifier blades 23, the liquid is rectified and rotated, and finally the micro-nano bubble liquid is sprayed out by nozzle 3.

[0072] like Figure 9 and Figure 10 As shown, the rectifier blade 23 satisfies the following condition:

[0073]

[0074]

[0075]

[0076]

[0077] In the formula:

[0078] R1 is the blade inlet rim radius, in meters;

[0079] R2 is the blade exit rim radius, in meters.

[0080] β1 is the blade inlet angle, in degrees;

[0081] β2 is the blade exit angle, in degrees;

[0082] Q represents the flow rate of injection chamber 1, in cubic meters per second;

[0083] d4 is the inlet diameter of injection chamber 1, in meters (m).

[0084] t represents time in seconds.

[0085] The rectifier blade 23 also satisfies the following condition:

[0086] L1=k3δ

[0087] L2=k4δ

[0088] P n =2.89n 2 -26.87n+73.92

[0089] In the formula:

[0090] L1 is the blade inlet grinding length, in meters;

[0091] L2 is the blade exit polishing length, in meters;

[0092] δ represents the leaf margin thickness, in meters.

[0093] P n The pitch of the nth blade is expressed in meters.

[0094] Example 1

[0095] Design requirements: Flow rate of 0.00031 cubic meters per second, inlet diameter of 0.042 meters, and unit time of 1 second.

[0096] Blade inlet rim radius:

[0097] Blade exit rim radius:

[0098]

[0099] Blade inlet angle:

[0100] Blade exit angle:

[0101] Blade inlet grinding length: L1=(8~12)δ=10×2=20

[0102] Blade exit grinding length: L2=(6~8)δ=7.5×2=15

[0103] Blade pitch: P n =2.89n 2 -26.87n+73.92.

[0104] like Figure 4 As shown, both the first and second helical blades have 5 sections of variable pitch blades, where P1≈50; P2≈32; P3≈19; P4≈13; P5≈11.8.

[0105] During the design process, the selection of other coefficients needs to be based on the specific actual situation.

[0106] like Figure 11 As shown, under 28℃ conditions, after the device ran for 2 minutes, the dissolved oxygen in a 25L volume of tap water increased from the initial 6.95mg / L to 8.34mg / L, which is about 70% higher than the dissolved oxygen capacity of existing technologies. Moreover, because microbubbles rise slowly in water, compared with large bubbles that rise to the surface quickly, the oxygen carried by the bubbles can be continuously dissolved in the water for a period of time after the device stops operating, and the high dissolved oxygen concentration in the water lasts for a longer period of time.

[0107] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0108] The detailed descriptions listed above are merely specific illustrations of feasible embodiments of the present invention and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A variable pitch micro / nano bubble generator, characterized in that, It includes a shell, an injection chamber (1) and a rectifier chamber (2). The shell is provided with a rectifier chamber (2) and an injection chamber (1) that communicates with the rectifier chamber (2). The injection chamber (1) is used to inject pressurized micro-nano bubble liquid into the rectifier chamber (2). The rectifier cavity (2) is equipped with rectifier blades (23) for rectifying the micro-nano bubble liquid and causing the micro-nano bubble liquid to rotate in a spiral. At least one nozzle (3) is installed at the output end of the rectifier cavity (2) for spraying out the rectified micro-nano bubble liquid. The rectifier blade (23) is a continuous spiral blade, which includes a first spiral blade and a second spiral blade. The first spiral blade and the second spiral blade are symmetrically arranged. The injection cavity (1) is aligned with the connection between the first spiral blade and the second spiral blade to generate two micro-nano bubble liquids with different spiral directions. The rectifier blade (23) is provided with a through hole along the axial direction of the nozzle (3). The first spiral blade and the second spiral blade are both variable pitch blades. The pitch of the first spiral blade and the second spiral blade gradually decreases along the direction of the injection cavity (1) towards the nozzle (3).

2. The variable pitch micro / nano bubble generator according to claim 1, characterized in that, A fixed baffle (27) is installed on the outside of the shell via a fixed bracket (26). The fixed baffle (27) is located on the spray path of the nozzle (3) and is used to counteract the relative movement of the shell caused by the pressure generated by the micro-nano bubble liquid sprayed out by the nozzle (3).

3. The variable pitch micro / nano bubble generator according to claim 1, characterized in that, The diameter of the through hole is 1.5-2 times the diameter of the nozzle inner hole.

4. The variable pitch micro / nano bubble generator according to claim 1, characterized in that, The micro-nano bubble liquid is composed of a mixture of gas and liquid, with a gas-to-liquid volume ratio of 1:

9.

5. The variable pitch micro / nano bubble generator according to claim 1, characterized in that, The rectifier blade (23) satisfies the following conditions: ， ， ， ， In the formula: R1 is the blade inlet rim radius, in meters; R2 is the blade exit rim radius, in meters. β1 is the blade inlet angle, in degrees; β2 is the blade exit angle, in degrees; Q is the flow rate of the injection chamber (1), in cubic meters per second; d4 is the inlet diameter of the injection chamber (1), in meters. t represents time in seconds.

6. The variable pitch micro / nano bubble generator according to claim 5, characterized in that, The rectifier blade (23) also satisfies the following condition: ， ， ， In the formula: L1 is the blade inlet grinding length, in meters; L2 is the blade exit polishing length, in meters; δ represents the leaf margin thickness, in meters. k3 is the first correction factor, and its value range is [value range missing]. ; k4 is the second correction factor, and its value range is [value range missing]. ; P n The pitch of the nth blade is expressed in meters.

Images