Micro-bubble air flotation oil removal device

Abstract

The invention relates to the field of sewage treatment, in particular to a microbubble air flotation oil removal device which comprises a central shaft pipe, the top end of the central shaft pipe is connected with an air inlet pipe through a rotary connector, a chassis is arranged at the bottom end of the central shaft pipe, a plurality of aeration pipes are evenly arranged on the outer circumferential wall of the chassis, and the bottom ends of the aeration pipes are rotationally matched with the chassis. The bottom end of the aeration pipe is communicated with the air inlet cavity through an air inlet hose, multiple sets of bubble nozzles are evenly arranged on the two sides of the aeration pipe, a sliding sleeve is installed on the outer side of the central shaft pipe in an up-down sliding mode, the upper end of the aeration pipe is matched with one end of a connecting rod in a rotating mode, and the other end of the connecting rod is installed on the outer circumferential wall of the sliding sleeve in a rotating mode. And a shell is fixedly arranged on the outer side of the central shaft tube. According to the device, bubbles can be sprayed out at different depths of wastewater, the coverage range of the microbubbles is effectively enlarged, the microbubbles can be uniformly dispersed at different depths in the stirring process, and the air flotation oil removal effect is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, and particularly relates to a micro-bubble air floatation oil removal device. BACKGROUND

[0002] At present, when oil-containing sewage is treated, the internal oil needs to be removed. The oil-containing sewage mainly comes from electric desalting sewage, circulating water field sewage, alkali residue sewage, delayed coking oil-containing sewage, reverse osmosis concentrated water, desulfurization and denitrification salt-containing sewage, and chemical plant oil-containing and salt-containing sewage. The oil-containing sewage contains oil, salt, emulsion, heavy taste, black color, and more suspended solids. Oil removal is an important part of sewage treatment technology. The oil removal device removes oil, reduces COD, sulfides, and suspended solids, and creates good conditions for subsequent biochemical treatment of sewage. The oil removal device mainly uses the "oil separation + air floatation" process for treatment. Traditional air floatation processes include vortex cavity air floatation, super-efficient shallow air floatation, and horizontal air floatation. The traditional processes have the disadvantages of large land occupation, poor effect, poor environment, high energy consumption, and the like. Therefore, there is an urgent need to develop a new efficient and environmentally friendly oil removal device.

[0003] Patent No. CN218403751U discloses a new type of micro-nano bubble air floatation oil removal device, which comprises a bottom cylinder, a nano bubble generator fixedly installed in the inside of the bottom cylinder, two brackets fixedly connected to the bottom cylinder, an outer shell fixedly connected to the two brackets, an air conditioner fixedly installed on the inner wall of the outer shell, and an oil removal mechanism and an auxiliary mechanism arranged in the inside of the outer shell. In the above structure, the nano bubble generator is fixedly arranged at the bottom of the container, which makes the position of bubble generation fixed. The generation and distribution of bubbles are not regular and uniform, which affects the air floatation oil removal effect. SUMMARY

[0004] The present application relates to the technical field of sewage treatment, and particularly relates to a micro-bubble air floatation oil removal device.

[0005] The present application relates to the technical field of sewage treatment, and particularly relates to a micro-bubble air floatation oil removal device.

[0006] A microbubble flotation oil removal device includes a central shaft tube. An air inlet pipe is connected to the top of the central shaft tube via a rotating connector. A base is located at the bottom of the central shaft tube. A plurality of aeration pipes are evenly arranged on the outer circumferential wall of the base. The bottom ends of the aeration pipes are rotatably fitted to the base. An air inlet chamber is located inside the base. The bottom ends of the aeration pipes are connected to the air inlet chamber via air inlet hoses. Multiple sets of bubble nozzles are evenly arranged on both sides of the aeration pipes. A sliding sleeve is slidably mounted on the outer side of the central shaft tube. The upper end of the aeration pipe is rotatably fitted to one end of a connecting rod. The other end of the connecting rod is rotatably mounted on the outer circumferential wall of the sliding sleeve. A housing is fixedly mounted on the outer side of the central shaft tube, located above the sliding sleeve. A fan impeller is rotatably mounted inside the housing. Lifting plates are slidably mounted on both sides of the housing. The fan impeller drives the lifting plates to reciprocate up and down. The bottom ends of the lifting plates are fixedly connected to the sliding sleeve via a fixing rod.

[0007] As a further embodiment of the present invention: a limiting slide rail is provided on the outer side of the central shaft tube along the axial direction, and a limiting slide groove is provided on the inner wall of the sliding sleeve, and the sliding sleeve is adapted to slide on the limiting slide rail through the limiting slide groove.

[0008] As a further aspect of the present invention: the housing is provided with an inner cavity, which is connected to the inner cavity of the central shaft tube. The fan impeller is symmetrically mounted on both ends of the inner cavity via a rotating axis. Outer cavities are provided on both sides of the inner cavity. Gears with missing teeth are fixedly sleeved at both ends of the rotating shaft, and the gears with missing teeth are located in the outer cavities.

[0009] As a further aspect of the present invention: a sliding groove is provided on the inner wall of the outer cavity, the lifting plate is slidably installed in the sliding groove, the top end of the lifting plate is connected to the housing through a return spring, the bottom end of the lifting plate slides through the housing and is fixedly connected to the fixing rod, and mating tooth grooves are provided on both sides of the lifting plate, and the toothless gear intermittently meshes with the mating tooth grooves.

[0010] As a further aspect of the present invention: the central shaft tube is connected to the drive source through a transmission component, and a rotating seat is provided at the bottom end of the central shaft tube, and the central shaft tube is rotatably connected to the bottom of the sewage container through the rotating seat.

[0011] As a further aspect of the present invention, the air inlet pipe is connected to the air outlet of the dissolved air pump.

[0012] The beneficial effects of this invention are:

[0013] (1) By setting up a central shaft tube, an aeration tube, a connecting rod and a sliding sleeve, during the air intake process, pressurized gas is introduced into the central shaft tube through the air intake tube. When the gas flows at high speed in the central shaft tube, the airflow will drive the fan impeller to rotate. At the same time, the fan impeller will drive the lifting plate to slide up and down. The lifting plate will drive the sliding sleeve to slide back and forth along the central shaft tube through the fixed rod. During the up and down sliding process, the sliding sleeve will drive the aeration tube to swing back and forth through the connecting rod. At the same time, pressurized gas is introduced into the air intake chamber and introduced into the aeration tube through the air intake hose. The pressurized gas will spray out a large number of fine and tiny bubbles through the bubble nozzle. When the tiny bubbles come into contact with the oil droplets in the wastewater, they will use the surface tension to adhere the tiny oil droplets to the surface of the bubbles, forming an oil bubble complex. The buoyancy of the bubbles will cause the oil bubble complex to float to the water surface, thereby achieving oil-water separation.

[0014] (2) Through the transmission structure between the impeller, the sliding sleeve, the connecting rod and the aeration pipe, the transmission process is reliable and stable. The power generated by the high-speed flow of the airflow is used to link the air intake process with the reciprocating swing process of the aeration pipe. No additional drive structure is needed. At the same time, the swing process of the aeration pipe is combined with the rotation process of the central shaft tube, so that the aeration pipe can spray microbubbles while stirring the wastewater. With the reciprocating swing, bubbles can be sprayed at different depths in the wastewater, which effectively improves the coverage of microbubbles. The stirring process makes the microbubbles evenly dispersed at different depths, which greatly improves the oil removal effect of air flotation. Attached Figure Description

[0015] The invention will now be further described with reference to the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 This is a schematic diagram of the central shaft tube in this invention.

[0018] Figure 3 This is a schematic diagram of the aeration pipe in this invention.

[0019] Figure 4 This is a schematic diagram of the longitudinal section structure of the present invention.

[0020] Figure 5 This is a schematic diagram of the internal structure of the shell in this invention.

[0021] Figure 6 This is a schematic diagram of the lifting plate in this invention.

[0022] Figure 7 This is a schematic diagram of the structure of the fixing rod in this invention.

[0023] In the diagram: 1. Central shaft tube; 101. Rotating connector; 102. Chassis; 103. Limiting slide rail; 104. Rotating seat; 105. Air inlet chamber; 2. Air inlet pipe; 3. Aeration pipe; 301. Air inlet hose; 302. Bubble nozzle; 4. Connecting rod; 5. Sliding sleeve; 501. Limiting slide groove; 6. Housing; 601. Fan impeller; 602. Inner chamber; 603. Outer chamber; 604. Rotating shaft; 605. Gear with missing teeth; 606. Lifting plate; 607. Mating tooth groove; 608. Return spring; 609. Sliding groove; 610. Fixed rod. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 7 As shown, this invention is a microbubble flotation oil removal device, including a central shaft tube 1. An air inlet pipe 2 is connected to the top of the central shaft tube 1 via a rotating connector 101. A base plate 102 is located at the bottom of the central shaft tube 1. A plurality of aeration pipes 3 are evenly arranged on the outer circumferential wall of the base plate 102. The bottom ends of the aeration pipes 3 are rotatably engaged with the base plate 102. An air inlet chamber 105 is provided inside the base plate 102. The bottom ends of the aeration pipes 3 are connected to the air inlet chamber 105 via air inlet hoses 301. Multiple sets of bubble sprayers are evenly arranged on both sides of the aeration pipes 3. The head 302 has a sliding sleeve 5 that is slidably installed on the outer side of the central shaft tube 1. The upper end of the aeration tube 3 is rotatably engaged with one end of the connecting rod 4. The other end of the connecting rod 4 is rotatably installed on the outer circumferential wall of the sliding sleeve 5. A housing 6 is fixedly installed on the outer side of the central shaft tube 1. The housing 6 is located above the sliding sleeve 5. A fan impeller 601 is rotatably installed inside the housing 6. Lifting plates 606 are slidably installed on both sides of the housing 6. The fan impeller 601 drives the lifting plates 606 to move up and down reciprocally. The bottom end of the lifting plate 606 is fixedly connected to the sliding sleeve 5 through a fixing rod 610.

[0026] Specifically, by setting up a central shaft tube 1, an aeration pipe 3, a connecting rod 4, and a sliding sleeve 5, during the air intake process, pressurized gas is introduced into the central shaft tube 1 through the air intake pipe 2. When the gas flows at high speed in the central shaft tube 1, the airflow will drive the impeller 601 to rotate. At the same time, the impeller 601 will drive the lifting plate 606 to slide up and down. The lifting plate 606 will drive the sliding sleeve 5 to slide back and forth along the central shaft tube 1 through the fixed rod 610. During the up and down sliding process, the sliding sleeve 5 will drive the aeration pipe 3 to swing back and forth through the connecting rod 4. At the same time, pressurized gas is introduced into the air intake chamber 105 and into the aeration pipe 3 through the air intake hose 301. The pressurized gas will spray out a large number of fine bubbles through the bubble nozzle 302. When the microbubbles come into contact with the oil droplets in the wastewater, the surface tension will be used to adhere the microbubbles to the surface of the bubbles, forming an oil bubble complex. The buoyancy of the bubbles will cause the oil bubble complex to float to the water surface, thereby achieving oil-water separation.

[0027] Furthermore, through the transmission structure between the impeller 601, the sliding sleeve 5, the connecting rod 4, and the aeration pipe 3, the transmission process is reliable and stable. Utilizing the power generated by the high-speed flow of air, the air intake process is linked with the reciprocating oscillation process of the aeration pipe 3, without the need for additional drive structures. At the same time, the oscillation process of the aeration pipe 3, combined with the rotation process of the central shaft pipe 1, allows the aeration pipe 3 to spray microbubbles while stirring the wastewater. Moreover, with the reciprocating oscillation, bubbles can be sprayed at different depths in the wastewater, effectively improving the coverage range of microbubbles. The rotational stirring process ensures that the microbubbles are evenly dispersed at different depths, greatly improving the air flotation oil removal effect.

[0028] like Figure 3 As shown, a limiting slide rail 103 is provided on the outer side of the central shaft tube 1 along the axial direction, and a limiting slide groove 501 is provided on the inner wall of the sliding sleeve 5. The sliding sleeve 5 is adapted to slide on the limiting slide rail 103 through the limiting slide groove 501.

[0029] Specifically, as the sliding sleeve 5 slides up and down along the central shaft tube 1, the limiting groove 501 will always remain on the limiting rail 103. By utilizing the sliding cooperation between the limiting groove 501 and the limiting rail 103, not only can the stability of the sliding sleeve 5 be improved during the sliding process, but the limiting rail 103 will also apply rotational constraints to the sliding sleeve 5, so that it can only perform axial linear motion, preventing it from rotating relative to the central shaft tube 1, thus making the transmission process stable and reliable.

[0030] like Figure 5As shown, the housing 6 has an inner chamber 602 inside, which is connected to the inner cavity of the central shaft tube 1. The fan impeller 601 is symmetrically mounted at both ends of the inner chamber 602 via a rotating shaft 604. The inner chamber 602 has an outer chamber 603 on both sides. The rotating shaft 604 has a toothed gear 605 fixedly sleeved at both ends, and the toothed gear 605 is located in the outer chamber 603.

[0031] like Figure 6 As shown, a sliding groove 609 is provided on the inner wall of the outer chamber 603. The lifting plate 606 is slidably installed in the sliding groove 609. The top end of the lifting plate 606 is connected to the housing 6 through a return spring 608. The bottom end of the lifting plate 606 slides through the housing 6 and is fixedly connected to the fixing rod 610. The lifting plate 606 is provided with mating tooth grooves 607 on both sides. The toothless gear 605 intermittently meshes with the mating tooth grooves 607.

[0032] Specifically, since the inner chamber 602 is connected to the central shaft tube 1, when pressurized gas is introduced into the central shaft tube 1, the high-speed airflow will drive the impeller 601 to rotate. The impeller 601 will drive the toothed gears 605 at both ends to rotate synchronously through the rotating shaft 604. When the toothed gears 605 mesh with the mating grooves 607 on both sides of the lifting plate 606, the toothed gears 605 will drive the lifting plate 606 to slide downward along the sliding groove 609, and push the sliding sleeve 5 downward through the fixing rod 610. At the same time, the return spring 608 will deform. When the toothed gears 605 disengage from the mating grooves 607, the lifting plate 606 is no longer driven by the toothed gears 605. Instead, it slides upward under the elastic force of the return spring 608 to restore its deformation, and pulls the sliding sleeve 5 upward through the fixing rod 610. Thus, the intermittent meshing of the toothed gears 605 and the mating grooves 607 realizes the up-and-down reciprocating sliding process of the sliding sleeve 5.

[0033] like Figure 1 and Figure 2 As shown, the central shaft tube 1 is connected to the drive source through a transmission component. A rotating seat 104 is provided at the bottom of the central shaft tube 1, and the central shaft tube 1 is rotatably connected to the bottom of the sewage container through the rotating seat 104.

[0034] Specifically, in this embodiment, the drive source is a servo motor, and the transmission component is a transmission belt or gear. The servo motor drives the central shaft tube 1 to rotate through the transmission belt or gear pair. The servo motor, transmission belt, and gear are common structural components in the art and are known in the prior art, so they will not be described in detail here.

[0035] It should be noted that since the central shaft tube 1 is connected to the intake pipe 2 through the rotating connector 101, the central shaft tube 1 can still achieve normal air intake by rotating the connector 101 while maintaining rotation.

[0036] In this embodiment, the air inlet pipe 2 is connected to the air outlet of the dissolved air pump (not shown in the figure). The dissolved air pump is typically a vortex pump or a gas-liquid multiphase pump. During operation, air and water enter the pump casing together at the pump inlet. The high-speed rotating impeller cuts the intake air into small bubbles. These small bubbles rapidly dissolve in the water under the high pressure environment inside the pump, forming dissolved air water, which then enters the flotation tank to complete the flotation process. The bubble diameter generated by the dissolved air pump is generally 20–40 μm, and the maximum air content in the dissolved air water can reach 30%. The pump's performance is very stable under changes in flow rate and air volume fluctuations, providing excellent operating conditions for pump adjustment and flotation process control.

[0037] The working principle of this invention is as follows: Figures 1-7 As shown, during the intake process, pressurized gas is introduced into the central shaft tube 1 through the intake pipe 2. When the gas flows at high speed in the central shaft tube 1, the airflow will drive the fan impeller 601 to rotate. The fan impeller 601 will drive the toothed gears 605 at both ends to rotate synchronously through the rotating shaft 604. When the toothed gears 605 mesh with the mating grooves 607 on both sides of the lifting plate 606, the toothed gears 605 will drive the lifting plate 606 to slide downward along the sliding groove 609, and push the sliding sleeve 5 downward through the fixing rod 610. At the same time, the return spring 608 will deform. When the toothed gears 605 disengage from the mating grooves 607, the lifting plate 606 is no longer driven by the toothed gears 605. Instead, it slides upward and resets under the elastic force of the return spring 608 to restore its deformation, and pulls the sliding sleeve 5 upward through the fixing rod 610. Thus, the intermittent meshing of the toothed gears 605 and the mating grooves 607 realizes the up-and-down reciprocating sliding process of the sliding sleeve 5. During the up-and-down sliding process, the sliding sleeve 5 drives the aeration pipe 3 to reciprocate through the connecting rod 4. Simultaneously, pressurized gas is introduced into the air inlet chamber 105 and then into the aeration pipe 3 through the air inlet hose 301. The pressurized gas is then sprayed out through the bubble nozzle 302, producing a large number of fine microbubbles. When these microbubbles come into contact with oil droplets in the wastewater, surface tension causes the oil droplets to adhere to the bubble surface, forming an oil-bubble complex. The buoyancy of the bubbles causes this oil-bubble complex to float to the water surface, thus achieving oil-water separation. The oscillation process of the aeration pipe 3, combined with the rotation of the central shaft tube 1, allows the aeration pipe 3 to simultaneously spray microbubbles and agitate the wastewater. Furthermore, the reciprocating oscillation allows bubbles to be sprayed at different depths in the wastewater, effectively increasing the coverage area of ​​the microbubbles. The agitation process ensures that the microbubbles are evenly dispersed at different depths, significantly improving the oil removal effect of the flotation system.

[0038] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A microbubble flotation oil removal device, comprising a central shaft tube (1), characterized in that, The top end of the central shaft tube (1) is connected to an air inlet tube (2) via a rotating connector (101). A base plate (102) is provided at the bottom end of the central shaft tube (1). Several aeration tubes (3) are evenly arranged on the outer circumferential wall of the base plate (102). The bottom end of the aeration tube (3) is rotatably engaged with the base plate (102). An air inlet chamber (105) is provided inside the base plate (102). The bottom end of the aeration tube (3) is connected to the air inlet chamber (105) via an air inlet hose (301). Multiple sets of bubble nozzles (302) are evenly arranged on both sides of the aeration tube (3). The central shaft tube (1) slides up and down on the outside. A sliding sleeve (5) is installed. The upper end of the aeration pipe (3) is rotatably engaged with one end of the connecting rod (4). The other end of the connecting rod (4) is rotatably installed on the outer circumferential wall of the sliding sleeve (5). A housing (6) is fixedly installed on the outside of the central shaft pipe (1). The housing (6) is located above the sliding sleeve (5). A fan impeller (601) is rotatably installed inside the housing (6). Lifting plates (606) are slidably installed on both sides of the housing (6). The fan impeller (601) drives the lifting plate (606) to move up and down reciprocally. The bottom end of the lifting plate (606) is fixedly connected to the sliding sleeve (5) through a fixing rod (610).

2. The microbubble flotation oil removal device according to claim 1, characterized in that, The outer side of the central shaft tube (1) is provided with a limiting slide rail (103) along the axial direction, and the inner wall of the sliding sleeve (5) is provided with a limiting slide groove (501). The sliding sleeve (5) is adapted to slide on the limiting slide rail (103) through the limiting slide groove (501).

3. The microbubble flotation oil removal device according to claim 1, characterized in that, The housing (6) has an inner chamber (602) inside, which is connected to the inner cavity of the central shaft tube (1). The fan impeller (601) is symmetrically mounted on both ends of the inner chamber (602) via a rotating shaft (604). The inner chamber (602) has an outer chamber (603) on both sides. The rotating shaft (604) has a toothed gear (605) fixedly sleeved at both ends, and the toothed gear (605) is located in the outer chamber (603).

4. The microbubble flotation oil removal device according to claim 3, characterized in that, The inner wall of the outer chamber (603) is provided with a sliding groove (609). The lifting plate (606) is slidably installed in the sliding groove (609). The top of the lifting plate (606) is connected to the housing (6) through a return spring (608). The bottom of the lifting plate (606) slides through the housing (6) and is fixedly connected to the fixing rod (610). The two sides of the lifting plate (606) are provided with mating tooth grooves (607). The toothless gear (605) intermittently meshes with the mating tooth grooves (607).

5. The microbubble flotation oil removal device according to claim 1, characterized in that, The central shaft tube (1) is connected to the drive source through a transmission component. A rotating seat (104) is provided at the bottom of the central shaft tube (1). The central shaft tube (1) is rotatably connected to the bottom of the sewage container through the rotating seat (104).

6. The microbubble flotation oil removal device according to claim 1, characterized in that, The air inlet pipe (2) is connected to the air outlet of the dissolved air pump.

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