Micro bubble generating device

Abstract

The invention discloses a micro-bubble generating device, comprising an air blowing mechanism and a microporous aerator, and also comprising a stirring mechanism, wherein the air blowing mechanism is composed of a fan and an air pipe, the fan is connected with the microporous aerator through the air pipe, the stirring mechanism is composed of a stirrer and a driving unit for driving the stirrer to rotate, the stirrer is arranged above the microporous aerator, and there is a distance D between the lower surface of the stirrer and the upper surface of the microporous aerator, the distance between the upper surface of the microporous aerator and the water surface is d, D is less than 1 / 2 d, and the stirrer is a radial flow stirrer or a mixed flow stirrer; the device has the advantages of low energy consumption, good effect and stable operation.

Description

Technical Field

[0001] The invention relates to the technical field of water treatment and chemical industry, and in particular to a micro-bubble generating device. Background Art

[0002] In water treatment and chemical processes, microbubble generating devices are mainly used for flotation separation and water oxygenation. They can also be used to dissolve other gaseous substances in water, such as chlorine dioxide, ozone disinfection, sterilization or chemical oxidation. With the advancement of technology, the application fields of microbubble generating devices are becoming more and more extensive.

[0003] In the application of microbubbles, the size of the microbubble diameter has a great influence on the treatment energy consumption and treatment effect. Generally speaking, under the same gas volume, the smaller the microbubble diameter, the better the treatment effect. Currently, the common microbubble generating devices include aeration devices, submersible aeration devices, dissolved gas release devices, and electrolysis devices.

[0004] Among them, the air aeration device is divided into microporous aeration device and hydraulic shear diffusion aeration device. The microporous aeration device uses a fan to blow the gas into the water, and then enters the water through the microporous aerator. The hydraulic shear diffusion aeration device uses a fan to blow the gas into the water, and then enters the water through the hydraulic shear diffusion device. The submersible aeration device is divided into two types according to the gas-liquid mixing method: impeller mixing and Venturi mixing. The device using impeller mixing is called a stirring aerator or propeller aerator, and the device using Venturi mixing is called a jet aerator. The dissolved gas release device first pressurizes the gas and dissolves it in high-pressure water, and then quickly reduces the pressure to release the dissolved gas from the water. The electrolysis device decomposes the substances in the water into gas and releases it into the water through the electrochemical action on the electrodes.

[0005] The aeration volume of the blower aeration device and the submersible aeration device is large, and the energy consumption is lower under the same gas generation volume, but the bubble diameter is larger, the gas-liquid mass transfer effect is poor, and the flotation effect is poor. Although reducing the aperture of the diffusion device can reduce the bubble diameter, an aperture that is too small not only rapidly increases the unit energy consumption, but also easily causes micropore blockage, affecting the normal operation of the equipment.

[0006] The bubbles produced by the dissolved gas release device and the electrolysis device are smaller in diameter, and the gas-liquid mass transfer effect and the flotation effect are better, but the energy consumption is higher under the same gas generation volume. The dissolved gas release device is also easily blocked, affecting the normal operation of the equipment.

[0007] Therefore, designing a microbubble generating device with low energy consumption and good effect is a technical problem to be solved urgently by those skilled in the art. Summary of the invention

[0008] In order to solve the above-mentioned deficiencies in the prior art, the present invention provides a microbubble generating device with low energy consumption, good effect and stable operation.

[0009] The technical solution adopted by the present invention to solve the above technical problems is: a microbubble generating device, including a blowing mechanism and a microporous aerator, and also including a stirring mechanism, the blowing mechanism is composed of a fan and an air pipe, the fan is connected with the microporous aerator through the air pipe, the stirring mechanism is composed of a stirrer and a driving unit for driving the stirrer to rotate, the stirrer is arranged above the microporous aerator, and there is a distance D between the lower surface of the stirrer and the upper surface of the microporous aerator, the distance between the upper surface of the microporous aerator and the water surface is d, D is less than 1 / 2 d, and the stirrer is a radial flow stirrer or a mixed flow stirrer.

[0010] Preferably, D is less than 1 / 10 d. The advantage is that under the same stirring power, a radial water flow with a relatively high speed can be obtained on the surface of the microporous aerator, so that the water flow generated by the agitator has a stronger effect of cutting the initial bubbles, and more small-diameter bubbles can be obtained.

[0011] Preferably, the stirrer is a radial flow stirrer. In this structure, the stirrer adopts a radial flow stirrer, because the water flow generated by it is mainly a horizontal flow, and the direction of the water flow is the main direction of cutting the initial bubbles, so more small-diameter bubbles can be obtained under the same stirring power conditions.

[0012] Preferably, the stirrer is a disc sawtooth stirrer. In this structure, the disc sawtooth stirrer is disc-shaped and has a sawtooth structure on the outer edge. Under the same stirring power condition, it can obtain a radial water flow with a higher speed, and the water flow generated by the stirrer has a more obvious effect of cutting the initial bubbles, and finally more small-diameter bubbles can be obtained.

[0013] Preferably, the agitator is provided with a plurality of through holes, and the plurality of through holes are radially distributed. In this structure, the water flow direction between the agitator with through holes and the microporous aerator is a single radial outward flow, while the water flow between the agitator and the microporous aerator when no through holes are provided is a circulation flow with the upper layer outward and the lower layer inward, so this structure can reduce the loss of useless energy and improve the efficiency of microbubble generation; the provision of through holes can also perform secondary cutting on the bubbles passing through the through holes, further reducing the bubble diameter; the provision of through holes can also reduce the rotational inertia of the agitator while maintaining rigidity and strength, which is conducive to reducing the difficulty of starting the agitator.

[0014] Preferably, the microporous aerator is a flat-plate microporous aerator. In this structure, since the gas diffusion surface of the flat-plate microporous aerator is a plane, under the same stirring power, the cutting effect of the radial water flow on the plane is stronger, so the water flow generated by the stirrer has a stronger effect of cutting the initial bubbles, and more small-diameter bubbles can be obtained.

[0015] Preferably, the microporous aerator has a gas diffusion area, a plurality of gas outlet holes are arranged in the gas diffusion area, the diameter of the agitator is 1 / 5 to 4 / 5 of the longest linear dimension of the gas diffusion area, and the agitator is located at the center of the gas diffusion area. In this structure, the shape of the gas diffusion area is not limited. When its plane is circular, the longest linear dimension of the gas diffusion area is its diameter. When its plane is rectangular, the longest linear dimension of the gas diffusion area is its diagonal length. The diameter of the agitator is 1 / 5 to 4 / 5 of the longest linear dimension of the gas diffusion area, and it is located at the center of the gas diffusion area. On the one hand, this is to make the radial water flow generated by the agitator act more evenly on the gas diffusion area. On the other hand, if the size is too large, in order to maintain the stiffness of the agitator, the thickness of the agitator needs to be increased, the water flow velocity of the cutting bubbles under the same stirring power condition is reduced, the moment of inertia is increased, and the difficulty of starting the agitator is increased; if the size is too small, the surface runoff velocity of the microporous aerator outside the agitator under the same stirring power condition is reduced, so it is most appropriate to select a range of 1 / 5 to 4 / 5.

[0016] Preferably, an air filter is connected to the air inlet and / or outlet of the fan. In this structure, the air filter is a prior art, which plays a role in filtering air, so that the gas that eventually flows to the microporous aerator is relatively clean, which helps the microporous aerator to operate normally for a long time without being blocked.

[0017] Compared with the prior art, the advantages of the present invention are: the air pipe through which the fan passes supplies air to the microporous aerator, so that the microporous aerator continuously generates small bubbles; the drive unit is set to drive the agitator to rotate, and when the agitator rotates, the water flow generated by the agitator plays a water flow cutting role on the surface of the microporous aerator, so that the diameter of the bubbles initially generated by the microporous aerator is reduced; since there is a distance D between the lower surface of the agitator and the upper surface of the microporous aerator, the distance between the upper surface of the microporous aerator and the water surface is d, D is less than 1 / 2 d, and the agitator is a radial flow agitator or a mixed flow agitator, so that the energy consumption of obtaining the same water flow cutting effect on the surface of the microporous aerator is low, so microbubbles can be efficiently generated; the structure avoids the problem of increased aerator gas resistance loss and increased fan energy consumption caused by simply reducing the air outlet of the microporous aerator, and also reduces the possibility of clogging of the air outlet, reduces the difficulty of pretreatment of the aeration gas, reduces the cost, and the above effect is more significant as the diameter of the microbubble decreases. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of the agitator in the first embodiment of the present invention;

[0020] Figure 3 A top view of the first embodiment of the present invention;

[0021] Figure 4 is a top view of the second embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0023] Figure 6 This is a schematic diagram of the structure of Embodiment 4 of the present invention;

[0024] Figure 7 This is a structural diagram of Embodiment 5 of the present invention. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0026] Embodiment 1: As shown in the figure, a microbubble generating device includes an air blowing mechanism and a microporous aerator 1, and also includes a stirring mechanism. The air blowing mechanism is composed of a fan 2 and an air pipe 3. The fan 2 is connected to the microporous aerator 1 through the air pipe 3. The stirring mechanism is composed of a stirrer 4 and a driving unit 5 for driving the stirrer 4 to rotate. The stirrer 4 is arranged above the microporous aerator 1, and there is a distance D between the lower surface of the stirrer 4 and the upper surface of the microporous aerator 1. The distance between the upper surface of the microporous aerator 1 and the water surface is d, D is less than 1 / 2 d, and the stirrer 4 is a radial flow stirrer or a mixed flow stirrer.

[0027] In this embodiment, D is less than 1 / 10 d. The advantage is that under the same stirring power, a radial water flow with a relatively high speed can be obtained on the surface of the microporous aerator 1, so that the water flow generated by the stirrer 4 has a stronger effect of cutting the initial bubbles, and more small-diameter bubbles can be obtained.

[0028] In this embodiment, the agitator 4 is a radial flow agitator. In this structure, the agitator 4 adopts a radial flow agitator, because the water flow generated by it is mainly a horizontal flow, and the direction of the water flow is the main direction of cutting the initial bubbles, so more small-diameter bubbles can be obtained under the same stirring power conditions.

[0029] In this embodiment, the driving unit 5 includes a motor and a stirring shaft. The motor is fixed above the water surface. The upper end of the stirring shaft is fixed to the output shaft of the motor, and the lower end of the stirring shaft is coaxially fixed to the stirrer 4.

[0030] In this embodiment, the agitator 4 is a disc sawtooth agitator. In this structure, the disc sawtooth agitator is disc-shaped and has a sawtooth structure on the outer edge. Under the same stirring power condition, it can obtain a radial water flow with a higher speed. The water flow generated by the agitator 4 has a more obvious effect of cutting the initial bubbles, and finally more small-diameter bubbles can be obtained.

[0031] In this embodiment, a plurality of through holes 41 are provided on the agitator 4, and the plurality of through holes 41 are distributed radially. In this structure, the direction of water flow between the agitator 4 provided with through holes 41 and the microporous aerator 1 is a single radial outward flow, while when the through holes 41 are not provided, the water flow between the agitator 4 and the microporous aerator 1 is a circulation flow with the upper layer outward and the lower layer inward, so this structure can reduce the loss of useless energy and improve the efficiency of microbubble generation; the provision of through holes 41 can also perform secondary cutting on the bubbles passing through the through holes 41, further reducing the bubble diameter; the provision of through holes 41 can also reduce the rotational inertia of the agitator 4 while maintaining rigidity and strength, which is conducive to reducing the difficulty of starting the agitator 4.

[0032] In this embodiment, the microporous aerator 1 is a flat-plate microporous aerator. In this structure, since the gas diffusion surface of the flat-plate microporous aerator is a rectangular plane, under the same stirring power, the cutting effect formed by the radial water flow on the plane is stronger, so the water flow generated by the stirrer 4 has a stronger effect of cutting the initial bubbles, and more small-diameter bubbles can be obtained.

[0033] In this embodiment, the microporous aerator 1 has a gas diffusion region 11, and a plurality of gas outlet holes 12 are arranged in the gas diffusion region 11. The diameter of the stirrer 4 is 1 / 5 to 4 / 5 of the longest linear dimension of the gas diffusion region 11, and the stirrer 4 is located at the center of the gas diffusion region 11. In this structure, since the plane shape of the gas diffusion region 11 is a rectangle, the longest linear dimension of the gas diffusion region 11 is its diagonal length, the diameter of the stirrer 4 is 1 / 5 to 4 / 5 of the diagonal dimension, and the stirrer 4 is located at the center of the gas diffusion region 11, on the one hand, the radial water flow generated by the stirrer 4 acts on the gas diffusion region 11 more evenly, and on the other hand, if the size is too large, in order to maintain the rigidity of the stirrer 4, the thickness of the stirrer 4 needs to be increased, the water flow speed of cutting bubbles under the same stirring power condition is reduced, the moment of inertia is increased, and the difficulty of starting the stirrer 4 is increased; if the size is too small, the surface runoff of the microporous aerator 1 other than the stirrer 4 under the same stirring power condition is reduced, so it is most appropriate to select a range of 1 / 5 to 4 / 5.

[0034] Embodiment 2: The other structures are the same as those of Embodiment 1, except that the microporous aerator 1 has a gas diffusion area 11, the plane shape of the gas diffusion area 11 is circular, a plurality of gas outlet holes 12 are arranged in the gas diffusion area 11, the diameter of the agitator 4 is 1 / 5 to 4 / 5 of the longest linear dimension of the gas diffusion area 11, and the agitator 4 is located at the center of the gas diffusion area 11. In this structure, since the plane shape of the gas diffusion area 11 is circular, the longest linear dimension of the gas diffusion area 11 is its diameter, the diameter of the agitator 4 is 1 / 5 to 4 / 5 of the diameter, and the agitator 4 is located at the center of the gas diffusion area 11. On the one hand, this is to make the radial water flow generated by the agitator 4 act on the gas diffusion area 11 more evenly. On the other hand, if the size is too large, in order to maintain the rigidity of the agitator 4, the thickness of the agitator 4 needs to be increased, the water flow speed of cutting bubbles is reduced under the same stirring power, the moment of inertia is increased, and the difficulty of starting the agitator 4 is increased; if the size is too small, the surface runoff of the microporous aerator 1 outside the agitator 4 is reduced under the same stirring power, so it is most appropriate to select a range of 1 / 5 to 4 / 5.

[0035] Embodiment 3: The other structures are the same as those of Embodiment 1, except that the air inlet and the air outlet of the fan 2 are respectively connected with air filters 6. In this structure, the air filter 6 is a prior art, which includes a frame, and a filter screen is installed in the frame to filter the air, so that the gas that finally flows to the microporous aerator 1 is relatively clean, which helps the microporous aerator 1 to operate normally for a long time without being blocked.

[0036] Embodiment 4: The other structures are the same as those of Embodiment 1, except that an air filter 6 is connected to the air inlet of the fan 2. In this structure, the air filter 6 is a prior art, which plays a role in filtering air, so that the gas that finally flows to the microporous aerator 1 is relatively clean, which helps the microporous aerator 1 to operate normally for a long time without being blocked.

[0037] Embodiment 5: The other structures are the same as those of Embodiment 1, except that an air filter 6 is connected to the air outlet of the fan 2. In this structure, the air filter 6 is a prior art, which plays a role in filtering air, so that the gas that finally flows to the microporous aerator 1 is relatively clean, which helps the microporous aerator 1 to operate normally for a long time without being blocked.

[0038] It is worth noting that the above is only a preferred embodiment of the present invention, and does not limit the scope of patent protection of the present invention. The present invention can also improve the materials and structures of the above-mentioned various parts, or replace them with technical equivalents. Therefore, all equivalent structural changes made by using the description and illustrations of the present invention, or directly or indirectly applied to other related technical fields are also included in the scope of the present invention.

Claims

1. A microbubble generating device, comprising a blowing mechanism and a microporous aerator, characterized in that: It also includes a stirring mechanism, the blowing mechanism is composed of a fan and an air pipe, the fan is connected to the microporous aerator through the air pipe, the stirring mechanism is composed of an agitator and a driving unit for driving the agitator to rotate, the agitator is arranged above the microporous aerator, and there is a distance D between the lower surface of the agitator and the upper surface of the microporous aerator, the distance between the upper surface of the microporous aerator and the water surface is d, D is less than 1 / 2 d, the agitator is a disc sawtooth agitator, the disc sawtooth agitator is disc-shaped and has a sawtooth structure on the outer edge, a plurality of through holes are arranged on the agitator, and the plurality of through holes are distributed radially, the microporous aerator has a gas diffusion area, a plurality of gas outlets are arranged in the gas diffusion area, the diameter of the agitator is 1 / 5 to 4 / 5 of the longest linear dimension of the gas diffusion area, and the agitator is located at the center of the gas diffusion area.

2. A microbubble generating device according to claim 1, characterized in that: D is less than 1 / 10 d.

3. A microbubble generating device according to claim 1, characterized in that: The microporous aerator is a flat-plate microporous aerator.

4. A microbubble generating device according to claim 1, characterized in that: An air filter is connected to the air inlet and / or air outlet of the fan.

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