CN201809227U - Multifunctional high-efficiency aerator - Google Patents

Abstract

The utility model is an improvement to the self-priming oxygen-increasing aeration device, which is characterized in that the depth of the suction impeller from the water surface is between 0.3m and 1/3 of the water depth, and there is one or more layers of stirring coaxially under the suction and diffusion impellers. impeller. Compared with the existing technology, aeration and stirring are integrated, and it can be applied to various water depth environments. It not only reduces the energy consumption of aeration, but also improves the service area and oxygen transfer rate. The oxygenation effect is good, and it can also make gas and solid The three-phase liquid and liquid are fully mixed, and it is also convenient to realize the free switching of aerobic, anoxic and anaerobic conditions in the sewage treatment process, breaking through the shortcomings of the existing technology of self-priming oxygen-increasing aeration, single function, and single operation mode. Increasing the defoaming slurry can not only eliminate the air bubbles on the surface of the aeration tank, but also increase the oxygenation. The self-priming oxygen-increasing aeration device of the utility model has the advantages of low aeration power consumption, high oxygen mass transfer rate, good oxygenation effect, simultaneous stirring function, and flexible and changeable operation process.

Description

Multi-functional high-efficiency aerator

technical field

The utility model is an improvement to the self-priming oxygen-increasing aeration device, and particularly relates to a multi-functional high-efficiency aerator with low power consumption, high oxygen transfer rate, large aeration service area, and integration of aeration and agitation.

Background technique

In order to improve the oxygen-dissolving efficiency of the impeller-type aerator in water, people have developed an underwater impeller self-priming oxygen-increasing aeration device. In this structure aeration device, the underwater suction and diffusion impellers are set at the end of the hollow or sleeve shaft, and the high-speed rotation of the impeller creates a relatively low-pressure area near the shaft, so that the air on the water surface is sucked in through the hollow shaft or sleeve, and is released by the impeller. The high-speed rotating impeller in the water breaks up the inhaled air and diffuses it to the surrounding water body to realize the aeration function. Because the underwater temperature is relatively low, the negative pressure inhales air, and the underwater bubbles dissolve while rising, the inhaled air dissolves in a larger volume, and the dissolved oxygen increases, thus improving the kinetic efficiency of dissolved oxygen. For example:

Chinese patent CN2076985 self-priming aerator, under the shaft of the sleeve, a turbine-type paddle with a guide tube around it and an air-diffusing net cover are arranged, and the turbine blade rotates and diffuses the inhaled air downward through the directional guide tube.

In the Chinese patent CN1106363 liquid aeration device, a propeller is arranged at the lower end of the air guiding shaft.

Chinese patent CN2093174 has a pool aerator with a turbine injection device, which is composed of a suction turbine on the liquid surface and an air diffuser impeller at the end of the underwater sleeve shaft, and the air volume in the water is increased through the suction turbine on the liquid surface.

The Chinese patent CN2171598 electric aerator has changed the suction and diffusion impellers, and adopts multiple stacked blades with fine pits to form rows of small holes in the radial direction of the impeller, and the inhaled air is discharged through the small holes to form small bubbles.

The above-mentioned underwater rotary impeller self-priming aeration device has one common feature regardless of the blade type: the suction and diffusion impellers are all arranged at the end of the rotating shaft, and there is only one impeller. Therefore, only the suction impeller cuts the inhaled air once, the air bubbles are not well dispersed, the air bubbles are relatively large, the dissolved oxygen efficiency will not be too high, and the aeration service area is small due to the poor air bubble diffusion; secondly, for deep pools Aeration must increase the depth of the impeller, and the depth of the suction impeller is large. Because the water pressure to be overcome by suction is proportional to the water depth, the power required for suction is large, thereby increasing the power consumption of aeration; the settings of suction and diffusion impellers If it is too shallow, not only the effect of dissolved oxygen at the bottom is poor, but also it will affect the overall dissolved oxygen amount and uniformity of dissolved oxygen, which is not conducive to the water treatment process; moreover, the single suction impeller only has the function of suction and diffusion, and its ability to stir the water body is limited. , It is not easy to fully mix the three phases of sludge, air and water, and a stirring and mixing device must be configured separately. Although by improving the blade shape, such as the use of turbine blades, it is still difficult to increase the air intake, resulting in insufficient efficiency of dissolved oxygen.

In addition, the existing underwater rotating impeller self-priming oxygen-increasing aeration device and other aeration devices only have aeration function, so they can only be used for aerobic process, the application range and function are relatively narrow, and cannot meet certain requirements. Some water treatment process requirements.

The above-mentioned deficiencies still have room for improvement.

Utility model content

The purpose of the utility model is to overcome the shortcomings of the above-mentioned prior art, and provide a multi-functional high-efficiency aeration device with low power consumption, high oxygen transfer rate, large aeration service area, integration of aeration-stirring, and good gas-liquid-solid mixing effect. device.

The purpose of the utility model is realized. The main idea is to set the suction and diffusion impellers at a place from 0.3m underwater to 1/3 of the water depth, and the suction air diffuses to the bottom of the pool by means of coaxially arranged stirring impellers, so as to reduce the power consumption of suction, It can also enhance the cutting effect on air bubbles in the water body, improve the efficiency of oxygen transfer, and at the same time, the stirring impeller can fully mix the three phases of gas, solid and liquid, and can expand the service area of dissolved air, thereby overcoming the shortcomings of the existing technology and realizing the utility model Purpose. Specifically, the utility model multifunctional high-efficiency aerator includes a rotating shaft with an air-inducing sleeve or a hollow rotating shaft, and suction and diffusion impellers arranged on the rotating shaft. Between /3, there is one or more layers of stirring impellers coaxially below the suction and diffusion impellers.

The utility model says:

Suction and diffusion impeller, its function is the same as that of the prior art. By rotating underwater, a low-pressure zone with relatively low atmospheric pressure is generated near the center of the impeller, so that the air on the surface of the water is sucked into the water through the sleeve or hollow shaft, and is cut and sheared by the impeller. Cut into small air bubbles, which diffuse into the water as the impeller rotates. According to this principle, the self-priming aeration aeration suction impellers in the prior art can be used, such as turbofan blade type, disc impeller, etc., among which the turbofan blade type is better, which has a relatively large suction efficiency . Suction impeller, one is preferably an impeller with upper and lower end plates (similar to the closed impeller of a centrifugal pump, the blades are located between the upper and lower end plates), and the upper and lower end plates are more conducive to generating a low pressure area in the impeller axis area between the two end plates , which is conducive to increasing the self-inhalation capacity, thereby increasing the dissolved oxygen rate. In order to avoid excessive air pockets in the center of the impeller caused by increased suction and reduce the suction capacity, one way is to have a hollow area on the lower end plate of the impeller, and prevent the accumulation of suction through the water flow diversion to reduce the air pockets and improve the air intake. Inspiratory volume. In addition, in order to further increase the suction capacity, it is better to use a hollow blade structure for the impeller blades, and make the hollow blades communicate with the air guide outlet of the rotating shaft (guiding air into the water through the hollow blades), this structure is more conducive to reducing the impeller near the impeller. The pressure can obtain a greater suction pressure difference, which is conducive to self-inhalation of more air.

The setting depth of the suction impeller is from 0.3m underwater to 1/3 of the water depth, which is an economically appropriate range for the test. If the setting is too shallow, the swirling flow generated by the rotation of the impeller will cause the liquid surface to be concave and affect the dissolved oxygen efficiency. If it is too shallow, it will cause inability to inhale; if the setting depth is too large, the suction power will increase due to the large water depth. energy consumption. According to the depth of the water treatment pool that is mostly used, the best setting depth is from 0.8m below the water surface to 1/3 of the water depth.

The hollow rotating shaft or the underwater air outlet of the sleeve can be arranged under the suction and diffusion impellers as in the prior art. In the present invention, the air outlet is preferably arranged between the blades of the impeller, which can further improve the resistance of the air suction impeller to air bubbles. Shattering effect.

The main function of the stirring impeller is to make the water body generate agitation and axial push flow through rotation. On the one hand, the air bubbles diffused from the upper layer to the water body are guided downward to the bottom of the pool, and then the dissolved oxygen is increased by floating up, and the air bubbles are evenly dispersed in a larger area. , expanding the aeration service area; on the other hand, the stirring impeller also has the function of mixing and cutting air bubbles. The downward water flow meets the bottom of the pool and rises up or rises along the pool wall. Aeration and agitation dead angle, and the lower layer of paddles can bring up the sludge at the bottom of the pool, making the sludge in a suspended state, which is more conducive to the full contact and mixing of water, gas and solid, and increases the mass transfer rate of oxygen and utilization. According to different pool depth and service area requirements, multiple stirring impellers can be arranged alternately. There are also various forms of stirring impellers, among which the axial flow type is preferred. The distance between the stirring impeller of the first layer and the suction and diffusion impellers is preferably ≥ 50 cm. If the distance is too small, the use of stirring impellers will increase and power will be wasted.

also:

The motor that drives the rotating shaft can also be set to frequency conversion control, which can increase the flexibility of the aerator, change the speed through the frequency converter, and realize the transformation between the aeration mode and the stirring mode, that is, the speed is different, and the aerators work separately in the aeration mode. Gas, stirring working state, or stirring-based working state, to meet the different requirements of water treatment process, without adding additional equipment.

It is also possible to add a defoaming paddle submerged in water slightly above the suction and diffusion impeller coaxially. The main function of the defoaming paddle is to chop the foam generated on the water surface. Its structure only needs to be able to break the bubbles on the liquid surface. Particularly limited, for example a kind of simplicity is that some vertical short rods are arranged on the periphery of a disk or one or several cross bars, and the rotation produces cutting action to break (cut) the air bubbles. The bubbles are chopped, and the liquid surface is continuously updated through the upflow and downflow of the circulation in the pool, and at the same time, the foam on the liquid surface is brought to the bottom of the pool, and the foam is driven to change the local thickness of the bubble surface, and the water flow makes the pressure on the foam surface uneven. , which leads to the bursting of the foam, not only achieves the purpose of defoaming, meets the requirements of the sewage treatment process, but also increases the amount of aeration into the water. Due to the swirling flow, the water surface is sunken, and the surrounding water surface foam continues to flow in and be chopped into the water, so it can be removed The air bubbles on the surface of the pool are all eliminated.

Compared with the self-priming oxygen-increasing aeration device in the prior art, the utility model multi-functional and high-efficiency aerator has the suction and diffusion impellers moved up, and one or more layers of agitating impellers are arranged at a large distance below, The integration of aeration and stirring can be applied to various water depth environments. It not only reduces the energy consumption of aeration, but also cooperates with the stirring and chopping function of the impeller to increase the service area and oxygen transfer rate, and increase the oxygen mass transfer rate. The oxygenation effect is good, and at the same time, the three phases of gas, solid and liquid can be fully mixed. The upper and lower end plates are added to the suction and diffusion impellers, which is more conducive to the generation of suction low-pressure areas. Compared with the same blade shape, it can improve the suction effect and suction volume. The hollow structure of the blades has a better air-breathing effect. Equipped with a variable frequency and variable speed device, it can easily realize the free switching of aerobic, anoxic and anaerobic conditions in the sewage treatment process, breaking through the shortcomings of the existing technology of self-priming oxygen-increasing aeration, single function, and single operating mode. Adding defoaming slurry can not only eliminate the bubbles on the surface of the aeration tank, but also bring the bubbles into the water with the circulating water flow, and also have the effect of increasing oxygen. The utility model self-priming oxygen-increasing aeration device has low aeration power consumption, high oxygen mass transfer rate, good oxygenation effect, and at the same time has a stirring function, and the operation process is flexible and changeable, which is different from the existing technical characteristics and advantages.

Below in conjunction with two exemplary embodiments, illustrate and help to further understand the essence of the utility model, but the specific details of the embodiment are only for explaining the utility model, and do not represent all technical solutions under the concept of the utility model, so it should not be interpreted as a reference to the utility model. The general technical solution of the new model is limited. Some insubstantial additions and/or changes that do not deviate from the concept of the utility model in the eyes of technicians, such as simple changes or replacements with technical features that have the same or similar technical effects, all belong to the protection of utility models scope.

Description of drawings

Fig. 1 is a structural schematic diagram of the utility model multifunctional high-efficiency aerator.

Figure 2 is a schematic diagram of the aeration work of the utility model multifunctional high-efficiency aerator.

Fig. 3 is a top view structure diagram of an air suction and diffusion impeller.

Fig. 4 is a top view structure schematic diagram of another suction and diffusion impeller.

Detailed ways

Embodiment 1: Referring to Figures 1, 2, and 3, the utility model multifunctional high-efficiency aerator includes a variable frequency motor 1 arranged on the top of the fixed frame 4, a speed reducer 2, and a frequency converter 3 for controlling the speed of the motor, and is fixed on the output of the speed reducer. The hollow rotating shaft 10 on the shaft has an air suction hole 5 on the upper part of the water surface of the rotating shaft, and a defoaming paddle 6, an air suction and a diffusion impeller 7, and two 1.1-meter distances between the upper and lower sides of the rotating shaft are coaxially arranged in sequence from top to bottom. Layer stirring impeller 8, bottom concentric positioning device 9. The suction impeller 7 is a turbine blade type, with end plates 11 on the upper and lower sides, and an air outlet 13 connected to the hollow rotating shaft between each blade 12, which is arranged at 1/3 of the pool depth (4 meters pool depth, 1.3 meters below the water surface). The defoaming paddle 6 is a horizontal rod or a disc, and there are some vertical short rods on the periphery, and the position is set so that the short rods are immersed in water during work.

The aerator works (Figure 2), and the motor 1 drives the hollow shaft 10 and the suction turbine 7 on the shaft, the stirring impeller 8 and the defoaming paddle 6 to rotate, for example, exceeding the aeration critical speed (200-450r/min), at Suction and diffusion impeller 7 near the center of the rotating shaft generate a large enough negative pressure, the air above the water surface is sucked in a large amount through the air hole 5 on the hollow shaft 10, and is ejected from the air outlet between the suction and diffusion turbine 7 blades through the hollow shaft 10. Under the action of the shearing force of the suction turbine 7 and the variable force of the dynamic pressure, it becomes very fine micro-bubbles. At the same time, the lower two-layer stirring impeller 8 rotates coaxially to generate a downward swirling flow, which brings the air bubbles introduced by the upper-layer suction and diffusion impeller 7 into the bottom of the pool, and the downward water flow hits the bottom of the pool and rises after reflection, thereby achieving full aeration. At the same time, the water flow circulates in the pool in the form of downflow and upflow, which effectively avoids the occurrence of dead angles. At the same time, the lower stirring impeller 8 lifts up the sludge at the bottom of the pool, making the sludge in a suspended state, and the three phases of gas, liquid, and solid are fully contacted, increasing Increased the mass transfer rate and utilization of oxygen. The defoaming paddle 6 rotates to chop the foam generated by the swirling flow on the water surface, and the liquid surface is continuously updated through the upflow and downflow formed by stirring, and the liquid surface foam is brought into the water body in the pool, and the foam is driven to change the local thickness of the bubble surface. The water flow makes the pressure on the foam surface uneven, which causes the foam to burst, which not only achieves the purpose of defoaming, meets the requirements of the sewage treatment process, but also increases the amount of aeration into the water.

When aeration is not needed, the motor speed is reduced, and the negative pressure around the suction and diffusion impeller 7 is not enough to suck in the outside air, and the aeration is basically stopped. At this time, the aerator is mainly in the working state of stirring and mixing.

When the aerator is switched from the aeration mode to the stirring mode, there is still a certain concentration of dissolved oxygen in the water. At this time, the treated water is an anoxic environment; when the dissolved oxygen is gradually exhausted, the pool is an anaerobic environment. In this way, the control of the frequency converter 3 enables the treatment tank to switch between aerobic-anoxic-anaerobic modes, satisfying the three environments required for denitrification and dephosphorization of sewage. According to the requirements of the treatment process, the operating state of the motor can be changed periodically, and the aerobic-anoxic-anaerobic mode switching can be realized in the same pool.

Embodiment 2: Referring to FIG. 4, as in Embodiment 1, the blades 14 of the oxygen-absorbing turbine are hollow, and the lower end plate is hollowed out 15, and the air outlet 13 of the hollow rotating shaft communicates with each hollow blade.

For those skilled in the art, under the inspiration of the patent concept and specific embodiments, some deformations that can be directly derived or associated from the patent disclosure and common sense, those of ordinary skill in the art will realize that other methods can also be used, Or the replacement of commonly known technologies in the prior art, and the different combinations of features, such as suction, diffusion impellers and stirring impellers using other blade shapes, the hollow shaft is replaced by a shaft and an air-inducing sleeve, which is not much for generating foam. It is also possible to omit non-substantial changes such as defoaming paddles, etc., which can also be applied, and can achieve the functions and effects described in this patent. No more examples are given to elaborate, and they all belong to the scope of protection of this patent.

Claims (11)

1. Multifunctional high-efficiency aerator, including a rotating shaft with an air-inducing sleeve or a hollow rotating shaft, and suction and diffusion impellers arranged on the rotation shaft. It is characterized in that the depth of the suction and diffusion impellers from the water surface is 0.3m to 1/ 3. There are one or more layers of stirring impellers coaxially below the suction and diffusion impellers. 2. The multifunctional high-efficiency aerator according to claim 1, characterized in that the depth of the suction and diffusion impellers from the water surface is 0.8m to 1/3 of the water depth. 3. The multifunctional high-efficiency aerator according to claim 1, characterized in that the suction and diffusion impellers are turbofan blades. 4. The multifunctional high-efficiency aerator according to claim 1, characterized in that there is an air outlet communicating with the hollow rotating shaft between the blades of the suction and diffusion impellers. 5. The multifunctional high-efficiency aerator according to claim 1, 2, 3 or 4, characterized in that there are end plates on the top and bottom of the suction and diffusion impellers. 6. The multi-functional high-efficiency aerator according to claim 5, characterized in that the blades of the suction and diffusion impellers are hollow blades, and the rotating shaft or sleeve air guide outlet communicates with the hollow blades. 7. The multifunctional high-efficiency aerator according to claim 5, characterized in that there is a hollow area on the lower end plate of the suction and diffusion impellers. 8. The multifunctional high-efficiency aerator according to claim 1, characterized in that there is a defoaming paddle slightly immersed in water when working above the suction and diffusion impellers. 9. The multifunctional high-efficiency aerator according to claim 1, characterized in that the stirring impeller is an axial flow type. 10. The multifunctional high-efficiency aerator according to claim 1, characterized in that there is a concentric positioning device at the bottom of the rotating shaft. 11. The multifunctional high-efficiency aerator according to claim 1, 2, 3, 4, 6, 7, 8, 9 or 10, characterized in that the rotational power of the driving shaft is composed of a frequency conversion motor and a frequency conversion controller.

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