CN203741077U - Squirrel-cage type self-flushing microbubble generator - Google Patents

Abstract

The utility model provides a squirrel-cage self-flushing micro-bubble generator, which is applied to the air flotation treatment of oily sewage and industrial waste water. The raw liquid enters the microporous membrane tube after forming a swirling flow on the rotating blade to improve the gas utilization rate; the ceramic membrane membrane tube adopts a squirrel-cage arrangement and a honeycomb micro-pore structure and cooperates with the intake manifold to ensure that the generated microbubbles are fine in size , uniform and large volume; installation of control valves, pressure safety valves and differential pressure transmitters makes the device highly automated; the motor drives the flushing sleeve and flushing tube to rotate continuously, and the microporous membrane tube is rinsed in turn until it is regenerated, and self-flushing is completed operation; the double cleaning of cleaning liquid flushing operation combined with gas purging operation can thoroughly clean the dirt in the micropores of the membrane tube; the microbubble tank is designed as three closed chambers: The ring plates are connected by screws, and the microporous membrane tube can be disassembled and replaced; the whole device has a compact structure, is easy to install, operate and maintain, and has low operating costs.

Description

Squirrel cage self-flushing microbubble generator

technical field

The utility model relates to a micro-bubble generator for air flotation treatment of oily sewage and industrial waste water.

Background technique

At present, pressurized dissolved air flotation and induced air flotation are widely used in municipal sewage and industrial wastewater treatment industries.

Pressurized dissolved air flotation is divided into conventional pressurized dissolved air flotation and multiphase dissolved air pump air flotation system. The bubbles formed by conventional pressurized dissolved air flotation are small, but additional equipment such as gas pressurized conveying equipment, filler dissolved air tanks and degassers are required, which makes the system composition more complicated, the operation energy consumption is high, and the equipment occupies a relatively small area. Large; the multiphase dissolving air pump air flotation system completes the process of water pressurization, gas suction and dissolution shearing in a multiphase dissolving air pump. The particle size of the generated microbubbles is basically about 30 μm, and the degree of gas-liquid mixing is high. The system The configuration is simple and the operation and maintenance are easy, but the power consumption and the cost of the pump itself cannot be ignored, and the multiphase dissolved air pump has a strong shear emulsification effect on the raw water, which will cause a significant reduction in purification efficiency.

Induced air flotation is divided into mechanically induced air flotation and hydraulically induced air flotation. Mechanically induced air flotation, that is, impeller rotary cutting air flotation, its main disadvantage is that the maintenance of the rotating parts of the mechanical system is complicated, and the system cannot perform backflow operation. Short flow and dead flow areas are easy to appear. At the same time, the particle size of the microbubbles generated by the air flotation machine is closely related to the rotary cutting strength of the impeller, and the particle size of the microbubbles is large and uneven. The power consumption is low. At the same time, there are no rotating parts in the jet or high-speed Venturi tube, and the shear force is small, which will not cause the breakage of the adherend. However, the particle size of the generated microbubbles is large, and its efficiency is limited by the jet. Or the outlet aperture of the high-speed Venturi tube has a greater impact, and the requirements for water quality and pressure entering the nozzle are more stringent, and smaller fluctuations may have a greater impact on the purification efficiency.

To sum up, there are many problems in the field application of the existing pressurized dissolved air flotation and induced air flotation, which requires innovation on the basis of the existing feasible technology, while adopting new materials and processing techniques, Considering work efficiency, microbubble particle size, uniformity and generation volume, convenient processing, installation and maintenance, and operating costs, a new type of high-efficiency microbubble generating device was developed.

Contents of the invention

In order to overcome the defects and deficiencies of the existing air flotation technology, the purpose of the utility model is to provide a squirrel cage self-flushing micro-bubble generator suitable for the air flotation treatment of oily sewage and industrial wastewater. According to the special structure and process designed, the microbubble generator has the characteristics of compact structure, high gas utilization rate, fine and uniform microbubble particle size, large generation volume, high degree of automation, easy installation, operation and maintenance, and low operating cost. .

The technical scheme adopted by the utility model to solve the technical problem is to develop a squirrel-cage self-flushing micro-bubble generator, which is mainly composed of a micro-bubble tank, a swirl blade, a squirrel-cage microporous membrane tube assembly, and a self-flushing assembly. , liquid inlet pipe, liquid outlet pipe, inlet manifold, flushing manifold and sewage pipe. In the air flotation operation, the raw liquid flows into the micro-bubble tank through the liquid inlet pipe and forms a swirling flow through the swirling blades, and then flows into the squirrel-cage microporous membrane tube. At the same time, the gas flows into the micro-bubble tank through the inlet manifold and passes through the micropores of the membrane tube. The cutting forms a fine airflow, and the rotating flow continuously shears and scours the fine airflow to generate microbubbles, which are finally discharged through the liquid outlet pipe. As the dirt in the micropores of the membrane tube gradually thickens and the pressure difference between the air chamber and the rectifying chamber of the microbubble tank drops to the minimum allowable value, the microbubble generator will automatically switch to the self-flushing operation of "double cleaning". In the flushing operation, the cleaning liquid flows through the flushing manifold into the air chamber, forms a fine liquid flow through the micropores of the membrane tube and continuously flushes the dirt in the micropores, and the dirty liquid is discharged through the sewage pipe; then deep cleaning is performed, that is, gas purging During operation, the gas flows into the air chamber through the inlet pipe, and the fine airflow is formed by cutting the micropores of the membrane tube to continuously purge the residual dirt on the micropores, and the dirty airflow is also discharged through the sewage pipe.

The micro-bubble tank is made of pressure vessel material Q345R, and the tank cavity is lined with epoxy resin. The micro-bubble tank adopts the structure of a vertical container, the upper part adopts an elliptical spherical head, and is connected with the lower cylindrical tank through a double-piece flange and a double-headed stud, and the double-piece flange is sealed by a nitrile rubber gasket . The upper part of the head is designed with a cylindrical boss, and the upper end of the inner ring surface in the middle of the boss is processed with an annular groove, and the lower part of the groove is processed with full-ring sealing grooves arranged in layers at equal intervals. The sealing grooves are matched with the labyrinth seal at this position. Six screw holes are evenly arranged around the boss. The bottom of the tank body adopts an elliptical spherical shell of the same type as the head, and the lower part of the shell is designed with a cylindrical boss. The middle of the boss is processed with holes and eight screw holes are evenly arranged around it.

The micro-bubble tank is divided into three airtight chambers from bottom to top: a rectification chamber, an air chamber and a steady flow chamber. The rectification chamber has built-in swirl blades. The utilization rate; the air chamber is formed by sealing the upper and lower partitions, with a built-in squirrel-cage microporous membrane tube assembly, which is used as a channel for gas flow during microbubble generation and purging operations, and as a channel for cleaning liquid flow during flushing operations ; The steady flow chamber is formed by the upper partition and the sealing head. The swirling flow carrying the micro-bubbles is collected in the steady flow chamber and becomes a gas-liquid two-phase steady flow, which is then discharged from the liquid outlet pipe, which can reduce the impact of unstable fluid on Shock caused by the pipeline.

The upper part of the head is 180°symmetrically arranged with a pressure safety valve joint and a liquid outlet pipe. The pressure safety valve is used to protect the entire generator. When the pressure in the generator is too high, the pressure safety valve releases the pressure through mechanical action. The pressure safety valve joint and The connection between the heads is realized by socket welding, and the flange is connected with the pressure safety valve. The upper and lower differential pressure transmitter connectors are installed on the lower part of the gas chamber and the tank wall of the rectification chamber. The differential pressure transmitter automatically detects the differential pressure signal of the gas chamber and the rectification chamber and converts it into an electrical signal, drives the motor to start, and implements self-flushing Operation, the connection between the differential pressure transmitter joint and the tank body is realized by insert welding. A slag discharge pipe is designed at the bottom of the tank body. After the sludge on the tank wall of the rectification chamber accumulates to a certain extent, it needs to be cleaned. After cleaning, the slag-containing sewage is discharged through the slag discharge pipe.

The liquid inlet pipe, as the channel for the raw liquid to enter the microbubble tank, is located at the bottom of the tank, and the liquid outlet pipe, as the channel for the gas-liquid two-phase steady flow out of the microbubble tank, is located on the upper part of the head. The liquid inlet pipe and the slag discharge pipe are 180°symmetric Arranged and arranged in a "∫" shape with the liquid outlet pipe. The sewage pipe is used as a channel for the dirty liquid and dirty air to discharge from the microbubble tank in the self-flushing operation. It is located at the center of the bottom of the tank. The bosses are connected, and the tank boss and the flange are sealed by a nitrile rubber gasket.

The inlet manifold is used as a channel for the gas to inject into the air chamber of the microbubble tank, and it is located at the lower part of the air chamber to ensure that the swirling flow generates a sufficient amount of bubbles in the bottom-up flow in the microporous membrane tube; at the same time, the inlet manifold It consists of 8 tracheal branches, each tracheal branch is evenly arranged along the tank wall of the microbubble tank, and the axis of the trachea outlet is respectively facing the axis of the microporous membrane tube, which further ensures that the generated microbubbles are uniform and have a large amount. The flushing manifold is used as a channel for the cleaning liquid to inject into the air chamber of the microbubble tank during the self-flushing operation. It is located in the upper part of the middle of the air chamber. The flushing manifold is also composed of 8 liquid pipe branches, and the positions correspond to the air pipes of the intake manifold. Branches to ensure the decontamination effect when the cleaning liquid flushes the micropores of the membrane tube from top to bottom. The outlet of the sewage pipe is in the same direction as the outlet of the slag discharge pipe, but opposite to the inlet of the liquid inlet pipe. The liquid inlet pipe, liquid outlet pipe, slag discharge pipe, inlet manifold and flushing manifold are connected to the tank wall of the microbubble tank by insert welding. The liquid inlet pipe, liquid outlet pipe, sewage pipe, slag discharge pipe, inlet Both the gas manifold and the flushing manifold adopt elbows and double-piece flanges to realize pipeline connections.

The surface of the swirl vane is nickel-phosphorus-plated and arranged evenly along the tank wall of the rectifying chamber. The number is 8 pieces. The value of the helix angle between them increases with the decrease of the stock solution viscosity. Each swirl vane includes front teeth and back teeth. The circular surface where the root of the front tooth is located is tangent to the tank wall of the rectification chamber to ensure that the raw liquid can be cut into the front tooth surface smoothly; the tooth surface of the front tooth adopts a concave arc surface , the flowing raw liquid forms a low pressure here and generates a swirling flow; the circular surfaces where the tooth tops of the front teeth and the tooth tops of the back teeth are located are tangent to ensure that the swirling flow on the front tooth surface flows out smoothly along the tangential direction, and maintains the continuity of the raw liquid in the entire rectifying chamber and stability. The tooth surface of the back tooth adopts an upwardly convex arc surface, and the intersection of the tooth root of the back tooth and the tank wall of the rectifying chamber adopts a circular arc transition to avoid sharp changes in the cross section and stiffness of the swirling flow blade, so as to ensure that the blade in the swirling flow has good Mechanical behavior.

The height of the end surface of the swirl blade on the normal surface perpendicular to the tooth line gradually increases along the tooth line, so the contact line of the raw liquid on the front tooth surface changes from short to long, and the contact area changes from small to large, reducing the impact of the raw liquid flow on the blade Impact and ensure a smooth swirling flow. All evenly arranged swirl blades are in one-to-one correspondence with the positions of the squirrel-cage microporous membrane tubes, ensuring that the raw liquid entering the rectification chamber through the liquid inlet pipe can flow continuously and stably after forming a swirling flow on each rotating blade. Microporous membrane tubes at corresponding positions can increase the shear rate of the stock solution and improve the gas utilization rate.

The squirrel cage microporous membrane tube assembly mainly includes microporous membrane tubes, upper and lower partitions and ring plates. The microporous membrane tube adopts a long tubular component, and its material is a ceramic membrane membrane tube. There are a large number of "honeycomb" micro pores on the tube wall, and it has a certain strength and corrosion resistance, which ensures that the microbubbles generated by the microporous membrane tube The particle size is fine, uniform and has a large amount of occurrence. The two ends of the microporous membrane tube communicate with the holes of the upper and lower partitions respectively, and the tightness is ensured by interference fit with the walls of the holes. Microporous membrane tubes are evenly arranged along the air chamber cavity, and the number is equal to the number of swirl blades.

Both the upper and lower partitions and the upper and lower ring plates are made of two-way stainless steel. The upper partition uses a cylindrical circular plate to divide the upper part of the microbubble tank into two closed chambers, the steady flow chamber and the air chamber. The inner ring surface in the middle of the upper partition is processed with Full-ring sealing grooves arranged in layers at equal intervals, the sealing grooves are matched with the labyrinth seals at this position, eight circular holes are evenly arranged around, and evenly arranged screw holes are processed on the edge. The upper ring plate adopts a ring-shaped circular plate, which is connected with the tank wall of the micro-bubble tank by circumferential welding. The upper end of the inner ring surface in the middle of the upper ring plate is processed with a circular groove with a rectangular cross-section, and the gap between the outer ring surface of the upper partition plate Cooperate to realize fixing, and the same number of uniformly arranged threaded through holes as the screw holes of the upper partition are processed under the groove. The lower partition is used to divide the lower part of the microbubble tank into two airtight chambers, the air chamber and the rectification chamber. Its structure and size are the same as the upper partition, except that the outer ring surface adopts an inverted conical shape with a thick top and a thin bottom. The structure and size of the lower ring plate are the same as that of the upper ring plate, except that the section of the annular groove is isosceles trapezoidal, and the ring surface of the groove cooperates with the inverted tapered outer ring surface of the lower partition to achieve positioning, ensuring the level of the upper and lower partitions degree and verticality of the microporous membrane tube. The upper baffle and the upper ring plate and the lower baffle and the lower ring plate are connected by screws and sealed by nitrile rubber pads. All the screws in the microbubble tank are made of stainless steel.

The self-flushing assembly includes motor, coupling, motor bracket, packing seal, head labyrinth seal, transmission shaft, upper partition labyrinth seal, shaft sleeve, lower partition labyrinth seal, flushing sleeve and flushing pipe. The motor is a servo motor, and the coupling is a flange coupling. The connection between the motor shaft and the transmission shaft is realized through bolts. After the motor is decelerated by the reducer, the transmission shaft and the bushing drive the flushing sleeve and the flushing pipe to rotate. The upper end of the motor support adopts a ring-shaped circular plate, four holes are evenly arranged around the circular plate, and the motor is connected by bolts. The three support legs are all made of the same type of angle steel, and the upper end is welded with the circular plate and the lower end is welded with the head. Realize the fixation between the motor and the microbubble tank.

The transmission shaft is used to transmit power, and adopts a stepped rotary body structure with variable cross-section, including an upper shaft head, a shaft body, a journal and a lower shaft head. The upper shaft head is located at the uppermost end of the transmission shaft, and its upper part is processed with a keyway. After installing the flat key, it is connected with the coupling. The outer ring surface of the lower part is finished and matched with the packing seal and the head labyrinth seal. The shaft body is used to connect the upper shaft head and the journal, and the outer ring surface of the journal is finished to cooperate with the labyrinth seal of the upper partition. The lower shaft head is connected with the shaft sleeve by a spline structure. The shaft sleeve is used to connect the transmission shaft and the flushing pipe, and its upper and lower ends are processed with four evenly arranged spline key grooves.

The double seal of packing seal and head labyrinth seal is used between the transmission shaft and the head. The packing of the packing seal is made of oil-impregnated asbestos packing, and the labyrinth seal of the head and the drive shaft is strengthened by three ○-shaped sealing rings evenly arranged along the shaft. seal. The same type of labyrinth seal is used for sealing between the transmission shaft and the upper partition, and the connecting shaft and the lower partition. The seal between the labyrinth seal and the transmission shaft is also strengthened by three ○-shaped sealing rings evenly arranged along the shaft.

The flushing sleeve is used to realize the communication between the self-flushing assembly and the squirrel-cage microporous membrane tube assembly. The position between the tubes, that is, the self-flushing assembly is not in communication with the microporous membrane tube, and during the self-flushing operation, the flushing sleeve is facing the lower nozzle of the microporous membrane tube, that is, the self-flushing assembly is in communication with the microporous membrane tube. Each set of self-flushing assembly is equipped with two flushing sleeves, which are arranged symmetrically along the axis of the drive shaft, and each flushing sleeve includes a communication pipe, a spring and a spring box. The connecting pipe adopts a stepped shaft structure, and the material is 35CrMo. After quenching and tempering, the surface is phosphating. The diameter of the middle through hole is equal to the diameter of the inner hole of the microporous membrane tube. It is the shoulder, the journal and the positioning shaft from top to bottom. , the upper end surface of the shoulder is ground, and it is precisely matched with the lower end surface of the lower partition; the journal is used to connect the shoulder and the positioning shaft, and the journal is connected to the lower end surface of the shoulder to form a shoulder, and the spring passing through it is positioned; the positioning The outer ring surface of the shaft is finished, and it is precisely matched with the inner hole of the spring box to form a moving pair. Combined with the compression of the spring, the seal between the flushing sleeve and the lower partition is realized. The spring box adopts a tube cap structure, and the ring body is processed with a full-ring groove for placing the spring; the lower end is processed with holes, which are connected with the elbow of the flushing pipe by insertion welding.

The flushing pipe provides power for the rotation of the flushing sleeve in the self-flushing operation and serves as a channel for the dirty liquid and dirty air to flow to the sewage pipeline. It mainly includes elbows, tees, connecting shafts, bearing bushes, sleeves and thrust roller bearings. The connecting shaft is used to transmit the power of the drive motor to the terminal parts of the self-flushing assembly. It adopts a stepped rotary structure with variable cross-section, including the shaft head and the shaft journal. The shaft head is connected with the shaft sleeve by a spline structure, and the shaft neck The outer ring surface is finished and matched with the labyrinth seal of the lower partition. The tee is used as the body of the flushing pipe. The upper end of the middle main pipe is connected with the journal of the connecting shaft by circumferential welding, and the upper ends of the two side pipes are respectively connected with the elbows by circumferential welding. The angle between the axes of the two side pipes is designed to be 90 °. The lower part of the three-way main pipe adopts a stepped shaft structure, which is the shoulder, the shaft body and the shaft head from top to bottom. The shaft body is used to connect the shoulder and the shaft head. Coordination; the shaft body is connected with the lower end surface of the shoulder to form a shaft shoulder, and the bearing bush that runs through the outside of the shaft body is positioned, while the shaft head is connected with the lower end surface of the shaft body to form a shaft shoulder, and the upper ring of the thrust roller bearing that runs through the shaft head is positioned; the shaft head The outer ring surface is finished, and it is interference fit with the upper ring of the thrust roller bearing.

The bearing pad adopts a split structure, and the material is powder metallurgy. The inner ring surface of the bearing pad is drilled with blind holes of a certain density and size. The blind holes in each layer are evenly distributed, and the spacing between layers is equal. Each blind hole in the center is filled with oil, so that a certain oil film is always maintained between the contact surface of the bearing bush and the tee shaft body, so as to ensure the lubricating effect between the two. Oil grooves are designed at the joints of the two halves of the bearing bush to further ensure sufficient and reliable oil supply for the bearing bush.

The diameter of the outer ring surface of the sleeve is equal to the inner diameter of the middle hole of the bottom boss of the micro-bubble tank, and the fixing between the flushing pipe and the tank is realized by circumferential welding. The middle channel of the sleeve adopts a variable cross-section stepped rotary structure. The diameter of the upper part of the channel is equal to the diameter of the outer ring surface of the bearing bush, but larger than the outer diameter of the upper ring of the thrust roller bearing; the diameter of the middle part of the channel is equal to the outer diameter of the lower ring of the thrust roller bearing, and the surface Finishing and precise matching with the lower ring of the thrust roller bearing; the middle part of the hole is connected with the lower end face to form a shaft shoulder, which positions the lower ring of the thrust roller bearing, thereby realizing the fixing of the thrust roller bearing.

The technical effect achieved by the utility model is that the raw liquid enters the microporous membrane tube after forming a swirling flow on the rotating blade, which can speed up the shearing speed of the raw liquid and improve the utilization rate of gas when bubbles occur; Cage layout and honeycomb micro-pore structure, together with the intake manifold with 8 corresponding tracheal branches, can avoid the strong shearing effect of the micro-bubble generator on the original liquid flow, and ensure that the micro-bubbles generated by the whole device are fine and uniform And the amount of generation is large; the control valve on the intake manifold automatically adjusts the intake amount to control the amount of air bubbles generated, and the pressure safety valve on the upper part of the head automatically releases the excessive pressure through mechanical action. At the same time, the pressure difference between the air chamber and the rectifying chamber The transmitter automatically detects the pressure difference signal and converts it into an electrical signal, and drives the motor to start the self-flushing operation, which makes the whole set of equipment highly automated; after the motor is decelerated by the reducer, the drive shaft drives the flushing sleeve and the flushing pipe to rotate, and flush in turn The microporous membrane tube will complete the self-flushing operation until it is regenerated; the cleaning liquid will flush the dirt in the micropores of the membrane tube through the 8 liquid pipe branches of the flushing manifold, combined with the purging operation of the gas through the 8 air pipe branches of the intake manifold, that is Double cleaning can thoroughly clean the dirt in the micropores of the membrane tube; the micro-bubble tank adopts a unique structure in which the upper and lower partitions are divided into three closed chambers: the rectification chamber, the air chamber and the steady flow chamber, and the upper and lower partitions and the ring plate are connected by screws , so that the microporous membrane tube can be disassembled and replaced freely; the self-flushing assembly is sealed with a packing seal and a labyrinth seal; the microbubble generator is compact in structure, which saves space for the entire air flotation skid layout, and each interface is connected by a flange , easy to install, and equipped with an automatic control system, making it easy to operate, easy to maintain and low operating costs.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described:

Fig. 1 is a typical structural diagram of a squirrel-cage self-flushing microbubble generator proposed according to the utility model.

Fig. 2 is a cross-sectional view along line A-A of Fig. 1 .

Fig. 3 is a schematic structural diagram of the microbubble tank in the squirrel-cage self-flushing microbubble generator.

Fig. 4 is a sectional view along line BB of Fig. 3 .

Fig. 5 is a schematic structural diagram of a squirrel-cage microporous membrane tube assembly in a squirrel-cage self-flushing microbubble generator.

Fig. 6 is a schematic structural diagram of the self-flushing assembly in the squirrel-cage self-flushing microbubble generator.

Fig. 7 is a schematic structural diagram of the flushing sleeve and the flushing tube of the self-flushing assembly in the squirrel-cage self-flushing microbubble generator.

Fig. 8 is a schematic flow chart of the air flotation operation of the squirrel-cage self-flushing micro-bubble generator.

Fig. 9 is a schematic diagram of the flushing operation flow of the squirrel-cage self-flushing microbubble generator.

Fig. 10 is a schematic flow chart of the purging operation of the squirrel-cage self-flushing microbubble generator.

In the figure 1 - self-flushing assembly, 2 - microbubble tank, 3 - squirrel cage microporous membrane tube assembly, 4 - swirl blade, 5 - liquid inlet pipe, 6 - sewage pipe, 7 - intake manifold, 8-flushing manifold, 9-outlet pipe, 10-pressure safety valve joint, 11-head, 12-stud stud, 13-double flange, 14-tank, 15-slag discharge pipe, 16 - Differential pressure transmitter connector, 17 - upper partition, 18 - upper ring plate, 19 - microporous membrane tube, 20 - lower partition, 21 - lower ring plate, 22 - motor, 23 - coupling, 24 - motor bracket, 25 - packing seal, 26 - head labyrinth seal, 27 - transmission shaft, 28 - upper partition labyrinth seal, 29 - shaft sleeve, 30 - lower partition labyrinth seal, 31 - flushing sleeve, 32 - flushing Pipe, 33-connecting shaft, 34-communication pipe, 35-spring, 36-spring box, 37-elbow, 38-tee, 39-bearing bush, 40-sleeve, 41-thrust bearing.

Detailed ways

In Figure 1 and Figure 2, the squirrel-cage self-flushing microbubble generator consists of a self-flushing assembly 1, a microbubble tank 2, a squirrel-cage microporous membrane tube assembly 3, swirl blades 4, liquid inlet pipe 5, Sewage pipe 6, intake manifold 7, flushing manifold 8 and liquid outlet pipe 9 are composed. When assembling, first connect the liquid inlet pipe 5, the sewage pipe 6 and their pipelines to the body of the microbubble tank 2 in sequence, and then put the flushing sleeve and the flushing pipe of the self-flushing assembly 1 into the rectifying chamber of the microbubble tank 2 And install the lower partition, then put the microporous membrane tube, transmission shaft and shaft sleeve into the air chamber of the microbubble tank 2 and install the upper partition, the uppermost end surface of the swirl vane 4 and the squirrel cage microporous membrane The positions of the microporous membrane tubes of the tube assembly 3 correspond one by one, and finally the microbubble tank 2 head, coupling and motor are respectively installed, and the liquid outlet pipe 9 is connected to the microbubble tank 2 head, and the air inlet pipe The air pipe branches of the sink 7 and the liquid pipe branches of the flushing manifold 8 and their pipelines are sequentially connected to the tank body of the microbubble tank 2 .

In Figure 1 and Figure 2, when debugging the squirrel-cage self-flushing micro-bubble generator, first conduct a hydraulic test on the entire device, the test pressure is 1.25 times the design pressure, and check the shaft seal and micro-bubble tank of the self-flushing assembly 1 2 Check the sealing of the head and the tank, the tank flange, the connection pipe and the manifold flange, the pressure measuring tube of the differential pressure transmitter and the valve for leakage. During operation, observe whether the particle size of the generated microbubbles is fine and uniform, and whether the pressure difference between the air chamber and the rectifying chamber is normal. During maintenance, regularly discharge slag once every two months, and manually open the valve on the slag discharge pipe at the bottom of the tank to discharge the cleaned slag-containing sewage; the squirrel-cage microporous membrane tube assembly can be disassembled every two years 3 parts for cleaning. When disassembling the squirrel-cage microporous membrane tube assembly 3, first disassemble the pressure safety valve, liquid outlet pipeline, motor, coupling and transmission shaft seal in sequence; Column, open the head, and unscrew the screws between the upper partition and the upper ring plate, remove the seal between the upper partition and the transmission shaft, open the upper partition; finally take out each microporous membrane tube for cleaning, stubborn oil and other dirt It can be cleaned with alkali or oil detergent, and dirt such as scale and rust residue can be cleaned with hydrochloric acid.

In Fig. 1 and Fig. 2, during air flotation, the flow rate and flow rate of the raw liquid can be realized by adjusting the regulating valve on the liquid inlet pipe 5 . During air flotation and purging operations, the gas injection speed at the outlet of each air pipe branch of the intake manifold 7 and the gas flow rate in the air pipe are realized by adjusting the regulating valves on each air pipe branch. During the self-flushing operation, the internal and external pressure difference between the squirrel-cage microporous membrane tube assembly 3 and the air chamber of the microbubble tank 2 can be realized by adjusting the operating pressure of the cleaning liquid. During the self-flushing operation, the spraying speed of the cleaning liquid at the branch outlets of the liquid pipes of the flushing manifold 8 and the flow rate of the cleaning liquid in the liquid pipes are realized by adjusting the regulating valves on the branches of the liquid pipes.

In Fig. 3 and Fig. 4, the microbubble tank 2 is composed of a pressure safety valve joint 10, a head 11, a stud 12, a double flange 13, a tank body 14, a slag discharge pipe 15 and a differential pressure transmitter joint 16 compositions. The head 11 is connected with the tank body 14 through the double-piece flange 13 and the double-headed stud 12; the pressure safety valve joint 10 is connected with the head 11 through insertion welding, and is connected with the pressure safety valve by a flange; The differential transmitter connector 16 is respectively connected to the gas chamber and the rectifying chamber of the tank body 14 through insertion welding, and is connected with the pressure measuring tube and the pressure transmitter by means of a flange; the liquid inlet pipe 5, the liquid outlet pipe 9, the discharge pipe The connection between the slag pipe 15, the intake manifold 7 and the flushing manifold 8 and the tank wall of the microbubble tank 2 is realized by insert welding. The swirl vanes 4 are connected with the rectification chamber of the tank body 14 through circumferential welding, and are evenly arranged along the tank wall of the rectification chamber.

In FIG. 5 , the squirrel-cage microporous membrane tube assembly 3 is composed of an upper partition 17 , an upper ring plate 18 , a microporous membrane tube 19 , a lower partition 20 and a lower ring plate 21 . The two ends of the microporous membrane tube 19 are connected with the upper partition 17 and the lower partition 20 through interference fit; the upper ring plate 18 and the lower ring plate 21 are connected with the tank body 14 of the microbubble tank 2 through circumferential welding to realize the Fixing of the cage-type microporous membrane tube assembly 3; the upper partition 17 and the upper ring plate 18 and the lower partition 20 and the lower ring plate 21 are connected by screws and sealed by a nitrile rubber pad.

In Fig. 5, during the air flotation and purging operations, the pressure difference between the squirrel-cage microporous membrane tube assembly 3 and the air chamber of the microbubble tank 2 can be realized by adjusting the operating pressure of the gas. During air flotation, the amount of microbubbles carried in the swirling flow can be realized by adjusting the height of the microporous membrane tube 19 . During air flotation, the amount of microbubbles per unit volume of the stock solution can be ensured by increasing the number of microporous membrane tubes 19 after the flow rate of the stock solution increases.

In FIG. 6 , the motor 22 in the self-flushing assembly 1 is decelerated by a reducer, and is connected by a coupling 23 , a transmission shaft 27 and a shaft sleeve 29 to drive the flushing sleeve 31 and the flushing pipe 32 to rotate. The motor bracket 24 is connected with the motor 22 through bolts, and is fixed on the head 11 of the microbubble tank 2 by welding the bracket legs. The double seal of packing seal 25 and head labyrinth seal 26 is adopted between the transmission shaft 27 and the head 11, and the upper partition labyrinth seal 28 combined with the ○-shaped sealing ring is used between the transmission shaft 27 and the upper partition 17. At the same time, the flushing pipe 32 is connected Between the shaft and the lower partition 20, a lower partition labyrinth seal 30 combined with an ○-shaped sealing ring is used to realize the sealing of the self-flushing assembly.

In Fig. 7, the flushing sleeve 31 is composed of a connecting pipe 34, a spring 35 and a spring box 36. A moving pair is formed between the holes, combined with the compression effect of the spring 35, the seal between the flushing sleeve 31 and the lower partition 20 is realized. The flushing pipe 32 is composed of a connecting shaft 33, an elbow 37, a tee 38, a bearing bush 39, a sleeve 40 and a thrust bearing 41. The elbow 37 realizes the connection between the flushing sleeve 31 and the flushing pipe 32 through insertion welding, and the connecting shaft 33 Realize the connection between the shaft sleeve 29 and the flushing pipe 32 through splines; the bearing bush 39 is located between the shaft body of the tee 38 and the sleeve 40 to avoid wear of the flushing pipe 32; the thrust bearing 41 is located on the shaft head of the tee 38 for To balance the axial force of the whole self-flushing assembly 1.

In Fig. 8, during the air flotation operation, the self-flushing assembly 1 and the flushing manifold 8 are closed, the flushing sleeve 31 is located between the two microporous membrane tubes 19, and the raw liquid flows through the liquid inlet pipe 5 into the bottom of the microbubble tank 2 The rectification chamber is filled with stock solution with rectification pressure. The stock solution forms a swirling flow through the swirl blade 4, and flows into the inner cavity of the squirrel-cage microporous membrane tube 19 through the lower partition 20, and the gas flows through the intake manifold 7 at the same time. Each trachea branch enters the airtight air chamber in the middle of the microbubble tank 2, which is filled with gas at the design pressure, and the gas passes through the micropore cutting on the microporous membrane tube 19 to form a fine airflow, and the rotating flow continuously shears and scours the fine airflow to generate microbubbles , the rotating flow carrying the microbubbles enters the steady flow chamber at the top of the microbubble tank 2 through the upper partition 17, and the gas-liquid two-phase steady flow is collected and discharged through the liquid outlet pipe 9. When the pressure in the microbubble tank 2 is too high, the pressure safety valve on the head 11 is automatically opened by mechanical action to release the pressure in the tank.

In Fig. 9, when the dirt in the pores of the membrane tube gradually thickens, the pressure difference between the rectification chamber and the air chamber of the microbubble tank 2 gradually decreases, and when the difference between the design pressure in the air chamber and the rectification pressure in the rectification chamber is lower than the minimum allowable After the differential pressure value is obtained, the differential pressure transmitter converts the differential pressure signal into an electrical signal, and drives the motor to start the self-flushing operation of "double cleaning". What carry out at first is the flushing operation of cleaning fluid, and liquid inlet pipe 5, inlet manifold 7 and liquid outlet pipe 9 are closed, and flushing manifold 8 is opened, and cleaning fluid flows through each liquid pipe branch of flushing manifold 8 and enters the microbubble tank 2. Air chamber, the chamber is filled with cleaning liquid with design pressure. Motor 22 is driven by coupling 23, transmission shaft 27 and shaft sleeve 29 to rotate flushing sleeve 31 and flushing pipe 32 after being decelerated by the reducer. When flushing sleeve 31 is facing When the lower nozzles of the two symmetrical microporous membrane tubes 19 in the squirrel-cage microporous membrane tube assembly 3, the cleaning liquid passes through the micropores of the membrane tubes to form a fine liquid flow and continuously washes away the dirt in the micropores, resulting in dirty liquid It enters the inner cavity of the microporous membrane tube 19, then flows into the outlet pipe 9 through the lower partition 20, and finally is discharged from the sewage pipe 6. The flushing sleeve 31 and the flushing pipe 32 are driven by the motor 22 to make circular motions along the axis of the coupling 23 to flush the squirrel-cage microporous membrane tubes 19 sequentially so that each microporous membrane tube 19 is regenerated. When the difference between the indoor design pressure and the rectifying pressure in the rectifying chamber reaches zero, the differential pressure transmitter sends out an alarm signal, and the flushing operation is completed.

In Fig. 10, after the flushing operation is completed, the second gas purging operation of the self-flushing operation is carried out, the flushing manifold 8 is closed, and the intake manifold 7 is opened, and the gas flows through each air pipe branch of the intake manifold 7 and enters the microbubble tank 2, the chamber is filled with gas with the design pressure, when the flushing cover 31 is facing the lower nozzles of the two symmetrical microporous membrane tubes 19 in the squirrel-cage microporous membrane tube assembly 3, the gas passes through the membrane tube microporous The hole cutting forms a fine airflow to continuously purge the residual dirt on the micropores, and the resulting dirty airflow enters the inner cavity of the microporous membrane tube 19, then flows into the liquid outlet pipe 9 through the lower partition 20, and finally is discharged from the sewage pipe 6. Through the circular motion of the flushing sleeve 31 and the flushing pipe 32, the squirrel-cage microporous membrane tube 19 is purged sequentially to thoroughly clean the dirt in the micropores of the membrane tube, and the purging operation is completed.

Claims (10)

1. a squirrel-cage is from rinsing microbubble generator, in air supporting operation, stoste flows into squirrel-cage microporous membrane pipe after forming rotating fluid by swirl vane, and gas stream enters microbubble tank through air inlet manifold simultaneously, and rotating fluid is sheared continuously and washed away fine air-flow generation microbubble; In rinsing operation, first be to rinse operation, the logical filmed passing tube micropore of scavenging solution forms fine liquid stream and constantly washes away the dirt in micropore, then purge operation, the logical filmed passing tube micropore cutting of gas forms fine air-flow and constantly purges dirt residual on micropore, containing soiling solution body with containing dirty air-flow, through blow-off pipe, discharge, it is characterized in that:

One microbubble tank; Described microbubble tank tank chamber entire body inner bushing ring epoxy resins, top adopts oval dome head, and is connected by the cylindricality tank body of biplate flange and studs and bottom; Microbubble tank is from bottom to top divided into rectification chamber, air chamber and plenum chamber San Ge airtight chamber, the indoor swirl vane of putting of rectification; Air chamber forms by upper lower clapboard is airtight, and built-in squirrel-cage microporous membrane pipe assembly as the passage of gas flow, is used as the mobile passage of scavenging solution when microbubble occurs and purges operation while rinsing operation; Plenum chamber is formed by upper spacer and end socket packing, and the rotating fluid that carries microbubble becomes gas-liquid two-phase current stabilization after plenum chamber collects;

One liquid-inlet pipe and drain pipe; Described liquid-inlet pipe is positioned at tank base, and drain pipe flows out the passage of microbubble tank as gas-liquid two-phase current stabilization, be positioned at end socket top, and 180 ° of liquid-inlet pipe and scum pipes are arranged symmetrically with and are with drain pipe " ∫ " shape layout;

One blow-off pipe; Described blow-off pipe is positioned at the central part of tank base, and its outlet is positioned at scum pipe below;

One air inlet manifold; Described air inlet manifold is positioned at position on the lower side, air chamber middle part, and air inlet manifold is comprised of 8 tracheae branches, and each tracheae branch is evenly distributed along the tank skin of microbubble tank, and tracheae outlet axis is respectively over against microporous membrane tubular axis line;

One rinses manifold; Described flushing manifold, as the passage that certainly rinses scavenging solution in operation and inject microbubble tank air chamber, is positioned at position on the upper side, air chamber middle part, rinses manifold and also 8 Ge Yeguan branches, consists of, and position is each tracheae branch of corresponding air inlet manifold respectively;

One swirl vane; Described swirl vane surface nickel phosphor plating is processed, and evenly distributed along rectification chamber tank skin, and number is 8, and swirl vane tooth trace is the spiral-line launching along rectification chamber tank skin; Swirl vane increases along tooth trace gradually at the normal plane end face height perpendicular to tooth trace, and the osculatory of stoste on the front flank of tooth is by short elongated for this reason, and contact area is changed from small to big;

One squirrel-cage microporous membrane pipe assembly; Described microporous membrane pipe adopts long-tube member, its material selection ceramic membrane film pipe, on tube wall with a large amount of " honeycomb fashion " fine pores; Microporous membrane pipe two ends respectively with the eyelet UNICOM of upper lower clapboard, and by shrink-fit, guarantee stopping property with eyelet wall; Microporous membrane pipe is evenly distributed along air chamber, and number equals swirl vane number;

One from washing assembly; Described in washing assembly motor select servosystem, shaft coupling adopts flange-face coupling, motor drives irrigating sleeve and washpipe to be rotated by transmission shaft and axle sleeve after step-down gear slows down; Electric machine support is realized fixing between motor and microbubble tank, and irrigating sleeve is realized the UNICOM between washing assembly and squirrel-cage microporous membrane pipe assembly, and every cover is equipped with two irrigating sleeves from washing assembly, and is arranged symmetrically with along drive shaft axis; Washpipe provides power conduct containing soiling solution body and contains dirty air flow stream to the passage of blowdown pipeline for irrigating sleeve rotates, bearing shell employing dissection type structure, and material selection mmaterial, bearing shell inner ring surface is drilled with the blind hole of certain density and pore size; Sleeve outer ring surface diameter equals the internal diameter of the middle eyelet of tank base boss.

2. squirrel-cage according to claim 1 is from rinsing microbubble generator, it is characterized in that: the end socket top of described microbubble tank has been arranged symmetrically with pressure security valve union and drain pipe, when producer internal pressure is too high, pressure safety valve is by mechanical effect relief pressure;

Upper and lower two pressure difference transmitter joints are installed on the air chamber bottom of described microbubble tank and rectification chamber tank skin, and pressure difference transmitter automatically detects the pressure difference signal of air chamber and rectification chamber and changes electric signal into, and drive-motor starts, and implements from rinsing operation;

The tank base of described microbubble tank is designed with scum pipe, and the slag inclusion sewage after cleaning is discharged through scum pipe.

3. squirrel-cage according to claim 1 is from rinsing microbubble generator, it is characterized in that: described swirl vane comprises nipper and back of the body tooth, nipper tooth root place disc and rectification chamber tank skin are tangent, the flank of tooth of nipper adopts recessed arc surface, nipper tooth top and back of the body tooth tooth top place disc are tangent, and the flank of tooth of back of the body tooth adopts the arc surface of epirelief.

4. squirrel-cage according to claim 1 is from rinsing microbubble generator, it is characterized in that: in described swirl vane, all evenly distributed swirl vane topmost end faces are corresponding one by one with squirrel-cage microporous membrane pipe position, assurance enters rectification chamber stoste by liquid-inlet pipe forms after rotating fluid on every rotating paddle, flows into continuously and stably the microporous membrane pipe of correspondence position separately.

5. squirrel-cage according to claim 1, from rinsing microbubble generator, is characterized in that: in the middle of described upper spacer, on inner ring surface, be processed with the loopful sealing groove of equidistant layered arrangement, sealing groove matches with the labyrinth seal of this position; In the middle of upper ring plate, the upper end of inner ring surface is processed with the annular recesses of a square-section, realizes fixing with upper spacer outer ring surface running fit;

Described lower clapboard outer ring surface adopts upper coarse and lower fine back taper; The cross section of lower ring plate annular recesses is isosceles trapezoid, and groove anchor ring coordinates and realizes location with the back taper outer ring surface of lower clapboard, the verticality of the levelness of lower clapboard and microporous membrane pipe in assurance.

6. squirrel-cage according to claim 1 from rinsing microbubble generator, is characterized in that: the described double seal that adopts packing seal and end socket labyrinth seal in washing assembly between transmission shaft and end socket, and gland sealed filler is selected oil immersion asbestos packing; Between transmission shaft and upper spacer and coupling shaft and lower clapboard, adopt the labyrinth seal of same model to seal, between labyrinth seal and transmission shaft, adopt three along the evenly distributed ○-shaped seal ring enhanced leaktightness of axle.

7. squirrel-cage according to claim 1 is from rinsing microbubble generator, it is characterized in that: the upper spindle nose bottom outer ring surface of described transmission shaft carries out precision work, coordinate with packing seal and end socket labyrinth seal, axle journal outer ring surface carries out precision work, coordinate with upper spacer labyrinth seal, lower spindle nose adopts spline structure to connect with axle sleeve;

The upper and lower two ends of described axle sleeve are all processed with four spline keyways that are evenly arranged.

8. squirrel-cage according to claim 1, from rinsing microbubble generator, is characterized in that: milled processed is carried out in the closed tube shoulder upper surface of described irrigating sleeve, with the lower surface precision-fit of lower clapboard; Axle journal and shoulder lower surface are connected to form the shaft shoulder, and its outer spring is run through in location; Locating shaft outer ring surface carries out precision work, with the inner hole refined sucking fit of spring case, forms moving sets;

On the spring case ring body of described irrigating sleeve, be processed with loopful groove, be used for placing spring.

9. squirrel-cage according to claim 1, from rinsing microbubble generator, is characterized in that: the coupling shaft spindle nose of described washpipe adopts spline structure to connect with axle sleeve, and axle journal outer ring surface carries out precision work, coordinates with lower clapboard labyrinth seal;

Angle between the threeway both sides siphunculus axis of described washpipe is 90 °, and precision work need be carried out in middle supervisor's axle body surface, with the inner ring surface running fit of bearing shell; Axle body and shoulder lower surface are connected to form the shaft shoulder, and the bearing shell outside axle body is run through in location, and spindle nose and axle body lower surface are connected to form the shaft shoulder, locate to run through on the thrust roller bearing outside spindle nose to enclose; Spindle nose outer ring surface carries out precision work, and on thrust roller bearing, encloses shrink-fit.

10. squirrel-cage according to claim 1, from rinsing microbubble generator, is characterized in that: in the middle of described sleeve, the upper diameter in duct equals bearing shell outer ring surface diameter, and is greater than the external diameter enclosing on thrust roller bearing; The external diameter that duct middle part diameter equals to enclose under thrust roller bearing, precision work is carried out on surface, and with thrust roller bearing under enclose precision-fit; Middle part, duct is connected to form the shaft shoulder with lower end surface, under the thrust roller bearing of location, encloses.