A negative pressure suction type sewage treatment aeration and dissolved oxygen device

Abstract

The present invention discloses a negative pressure suction type sewage treatment aeration and oxygen dissolving device, and relates to the technical field of equipment for increasing the amount of dissolved oxygen in water by means of rotation and stirring. It includes an impeller, an impeller fairing and a driving motor; the upper part of the impeller fairing is provided with a first water inlet corresponding to the position of the V-shaped drainage part; the impeller fairing is provided with an extended flow channel in the length extension direction of the outer extension of the inclined plate; the impeller fairing is provided with an annular air inlet chamber below the circular diverter plate; the upper end surface of the annular air inlet chamber is provided with an annular air outlet window; an annular microporous air outlet plate is embedded in the annular air outlet window; a second water inlet is provided at the axial part of the annular air outlet window; the second water inlet is connected with a lower water inlet pipe; the water inlet pipe passes through the annular air inlet chamber and is sealed with the annular air inlet chamber; the lower part of the annular air inlet chamber is connected with an air inlet pipe. The gas-liquid mixture of the present invention has a larger water area covered by the spray, and the bubble volume is smaller than that of the existing submersible aeration oxygenator, and the aeration efficiency is higher.

Description

Technical Field

[0001] The invention relates to a device for increasing the amount of dissolved oxygen in water by means of rotation and stirring, in particular to a negative pressure suction type sewage treatment aeration and oxygen dissolving device. Background Art

[0002] In sewage treatment, aeration is a means of bringing air and water into strong contact, with the goal of dissolving oxygen in the air into the water. In order to improve aeration efficiency, it is a consensus in the industry to increase the gas volume, increase the number of aeration heads, and reduce the size of bubbles.

[0003] In the known technology, the smaller the bubble is, the larger the surface ratio of the bubble to water is, the greater the pressure inside the bubble is, and the higher the dissolved oxygen rate is. At present, the existing submersible aeration oxygenator is a motor that drives the impeller to rotate at high speed to discharge water to the surroundings. At the same time, the negative pressure generated by the high-speed discharge of water is used to suck the external atmosphere into the impeller chamber. Through the high-speed shear of the impeller, the water and gas are sheared and mixed to form a large number of bubbles, which are discharged with the water flow to play the role of aeration and oxygenation.

[0004] The existing submersible aerators have the following problems: 1. After the water-gas mixture formed by the shearing of the high-speed impeller is ejected, the gas is relatively light in mass, and its lateral flow distance is relatively short compared to the water flow, so the diffusion coverage in the water body is small. 2. After the water-gas mixture formed by the shearing of the impeller leaves the mixing chamber, the bubbles will grow larger as they merge with each other. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a negative pressure suction sewage treatment aeration and dissolved oxygen device in response to the above-mentioned technical deficiencies. The gas-liquid mixture sprayed out covers a larger water area, has a smaller bubble volume than the existing submersible aeration oxygenator, and has a higher aeration efficiency.

[0006] The technical solution adopted by the present invention is to provide a negative pressure suction type sewage treatment aeration and dissolved oxygen device, comprising:

[0007] An impeller, the impeller comprising a plurality of M-shaped blades uniformly arranged in the circumferential direction; all the M-shaped blades are fixedly connected through a circular splitter plate with the axial direction of the impeller as the center; the M-shaped blade comprises an oblique blade extension located outside the circular splitter plate and a V-shaped drainage portion located above the circular splitter plate; the angle between the oblique blade extension and the axial direction of the impeller is between 70° and 30°; the circular splitter plate is axially fixed with an impeller drive shaft arranged upward;

[0008] The impeller fairing is arranged on the periphery of the impeller and is adapted to the rotation trajectory of the impeller. The upper part of the impeller fairing is provided with a first water inlet corresponding to the position of the V-shaped drainage part; in the length extension direction of the outer extension of the inclined plate, the impeller fairing is provided with an extended flow channel; below the circular splitter plate, the impeller fairing is provided with an annular air inlet chamber; the space between the upper end surface of the annular air inlet chamber and the circular splitter plate is called a bubble forming flow channel; the upper end surface of the annular air inlet chamber is provided with an annular air outlet window; an annular microporous air outlet plate is embedded in the annular air outlet window; a second water inlet is provided at the axial part of the annular air outlet window; the second water inlet is connected with a lower water inlet pipe; the water inlet pipe passes through the annular air inlet chamber and is sealed with the annular air inlet chamber; the lower part of the annular air inlet chamber is connected with an air inlet pipe;

[0009] A driving motor is linked with the impeller driving shaft and is encapsulated in a watertight shell; the watertight shell is fixedly connected to the impeller fairing; outside the impeller driving shaft, water inlet windows are evenly opened on the side walls of the watertight shell.

[0010] As an optimization of the technical solution, a one-way valve is installed in the air intake pipe, which is connected to the direction of the annular air intake chamber.

[0011] As an optimization of the technical solution, an air filter component is installed in the air intake pipe upstream of the one-way valve.

[0012] As an optimization of the technical solution, the extended flow channel is provided with converging injection holes evenly arranged in the circumferential direction; when the impeller pumps water, the water flow in the extended flow channel is ejected from the converging injection holes.

[0013] As an optimization of the technical solution, the annular microporous air outlet plate has convex ribs evenly distributed in the diameter direction for increasing the surface area of ​​bubble release.

[0014] In the technical solution recorded in the present invention, the impeller rotates at a high speed, sucking water from the first water inlet, and then from the extended flow channel of the impeller fairing. Because no air enters the first water inlet, the entire V-shaped drainage portion of the M-type blade and the part of the inclined blade extension that docks with the V-shaped drainage portion work in an environment without air mixing, so the water spraying effect is higher and the speed of water spraying is faster. The airflow is sucked in by negative pressure from the lower part of the circular diverter plate, and is horizontally mixed with the water flow sucked in from the second water inlet at a high speed to become a gas-liquid mixture. The gas-liquid mixture enters the impeller fairing from the bubble forming flow channel, and is finally ejected from the extended flow channel. The position where the gas-liquid mixture enters the impeller fairing is in the lower layer of the entire water flow, which is a laminar flow close to the lower wall of the impeller fairing, and does not affect the suction efficiency and ejection speed of the upper water flow.

[0015] The water flows downward along the length of the oblique blade extension of the M-type blade and is ejected at high speed. The relative velocity of the gas-liquid mixture at the lower layer of the water flow is relatively low. According to the Bernoulli principle, the gas-liquid mixture will diffuse to the upper layer during the ejection process and be ejected along with the upper high-speed water flow, covering a larger area of ​​water. In addition, with the downward-inclined ejection direction, the upper water flow can push the gas-liquid mixture to a greater distance.

[0016] Compared with the existing submersible aeration oxygenator, in the technical solution of the present invention, the gas enters the bubble forming flow channel from the annular microporous air outlet plate, and the annular microporous air outlet plate increases the resistance when the gas enters, thereby increasing the negative pressure in the bubble forming flow channel. That is to say, the air pressure of the bubbles formed in the bubble forming flow channel is lower than the air pressure formed by shearing of the submersible aeration oxygenator. When the tiny bubbles with lower air pressure enter the water body, the external negative pressure disappears. Under the action of the water pressure and molecular tension, the bubbles will be compressed and contracted into smaller bubbles. The smaller the bubbles are, the slower the speed of floating up in the water body, the longer the floating time, and the higher the dissolved oxygen rate.

[0017] Other technical effects of the present invention will be gradually clarified in the development of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 Figure 1 Schematic cross-sectional view of ;

[0020] Figure 3 is a schematic diagram of the structure of the impeller;

[0021] Figure 4 Schematic diagram of the structure of the annular microporous air outlet plate.

[0022] In the figure, 1. impeller; 2. M-shaped blades; 3. circular splitter plate; 4. inclined blade extension; 5. V-shaped drainage part; 6. impeller drive shaft; 7. impeller fairing; 8. first water inlet; 9. extended flow channel; 10. annular air inlet chamber; 11. bubble formation flow channel; 12. annular air outlet window; 13. annular microporous air outlet plate; 14. second water inlet; 15. lower water inlet pipe; 16. air inlet pipe; 17. drive motor; 18. water-proof shell; 19. water inlet window; 20. one-way valve; 21. air filter component; 22. focusing injection hole; 23. convex rib; 24. V-shaped guide plate; 25. drive motor cable. DETAILED DESCRIPTION

[0023] like Figure 1 — Figure 3As shown, a negative pressure suction type sewage treatment aeration and oxygen dissolving device comprises an impeller 1, wherein the impeller 1 comprises a plurality of M-shaped blades 2 evenly arranged in the circumferential direction; all the M-shaped blades 2 are fixedly connected through a circular diverter plate 3 with the axial direction of the impeller 1 as the center; the M-shaped blade 2 comprises an inclined blade extension 4 located outside the circular diverter plate 3 and a V-shaped drainage portion 5 located on the upper part of the circular diverter plate 3; the angle between the inclined blade extension 4 and the axial direction of the impeller 1 ranges from 70° to 30°; the circular diverter plate 3 is axially fixed with an impeller drive shaft 6 arranged upward;

[0024] The impeller fairing 7 is arranged on the periphery of the impeller 1 and is adapted to the rotation trajectory of the impeller 1. The upper part of the impeller fairing 7 is provided with a first water inlet 8 corresponding to the position of the V-shaped drainage part 5; in the length extension direction of the inclined plate extension part 4, the impeller fairing 7 is provided with an extended flow channel 9; below the circular diverter plate 3, the impeller fairing 7 is provided with an annular air inlet chamber 10; the space between the upper end surface of the annular air inlet chamber 10 and the circular diverter plate 3 is called a bubble forming flow channel 11; the upper end surface of the annular air inlet chamber 10 is provided with an annular air outlet window 12; an annular microporous air outlet plate 13 is embedded in the annular air outlet window 12; a second water inlet 14 is provided at the axial part of the annular air outlet window 12; the second water inlet 14 is connected with a lower water inlet pipe 15; the water inlet pipe passes through the annular air inlet chamber 10 and is sealed with the annular air inlet chamber 10; the lower part of the annular air inlet chamber 10 is connected with an air inlet pipe 16;

[0025] The driving motor 17 is linked with the impeller driving shaft 6, and the driving motor 17 is encapsulated in a watertight shell 18; the watertight shell 18 is fixedly connected to the impeller fairing 7; outside the impeller driving shaft 6, the side wall of the watertight shell 18 is evenly provided with water inlet windows 19.

[0026] The present invention and the existing submersible aeration oxygenator adopt the same working mode, that is, the negative pressure suction sewage treatment aeration and oxygen dissolving device is placed at the bottom of the sewage pool, and the air inlet pipe 16 is connected to the top of the water body and communicated with the external atmosphere.

[0027] The lower surface of the circular diverter plate 3 can be set to a smooth plane. When rotating, the circular diverter plate 3 and the water sucked in from the second water inlet 14 have a small stirring and shearing effect. The water flow entering from the second water inlet 14 is discharged radially along the bubble forming flow channel 11, and the air sucked in from the micropores on the surface of the annular microporous air outlet plate 13 is carried away laterally by the high-speed water flow passing through, forming tiny bubbles. It is worth noting that the gas-liquid mixture formed after mixing, as it flows outward, the fan-shaped area it flows through increases, and the spacing between bubbles will also increase. The advantage of this is that the probability of bubble fusion decreases as the average spacing increases. The material of the annular microporous air outlet plate 13 can be selected as a microporous hydrophilic TPEE material. The stronger the surface hydrophilicity, the smaller the bubbles formed after the microporous air outlet.

[0028] To further optimize this embodiment, a one-way valve 20 is installed in the air inlet pipe 16, which is connected to the annular air inlet chamber 10. The function of the one-way valve 20 is to prevent a large amount of water from flowing back from the annular microporous air outlet plate 13 to the annular air inlet chamber 10 when the drive motor 17 is turned off, thereby preventing the annular microporous air outlet plate 13 from being blocked.

[0029] To further optimize this embodiment, an air filter component 21 is installed in the air inlet pipe 16 upstream of the one-way valve 20; the air filter component 21 can be made of filter materials such as filter cotton and dense filter mesh, and its function is to filter the air entering the annular microporous air outlet plate 13 to prevent it from being blocked.

[0030] To further optimize this embodiment, the extended flow channel 9 is provided with converging injection holes 22 evenly arranged in the circumferential direction; when the impeller 1 pumps water, the water flow in the extended flow channel 9 is ejected from the converging injection holes 22; the converging injection holes 22 are arranged at intervals by V-shaped guide plates 24 arranged between the upper and lower side walls of the impeller fairing 7.

[0031] like Figure 4 As shown, the present embodiment is further optimized, and the annular microporous gas outlet plate 13 is evenly distributed with ribs 23 in the diameter direction for increasing the surface area of ​​bubble release. Another function of the ribs 23 is to guide the passing gas-liquid mixture and reduce the shear effect of the upper circular diverter plate 3 on the gas-liquid mixture.

[0032] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A negative pressure suction type sewage treatment aeration and oxygen dissolving device, characterized in that: include An impeller, the impeller comprising a plurality of M-shaped blades uniformly arranged in the circumferential direction; All M-type blades are fixedly connected through a circular splitter plate with the axial direction of the impeller as the center; the M-type blade includes an oblique blade extension located outside the circular splitter plate and a V-shaped drainage portion located on the upper part of the circular splitter plate; the angle between the oblique blade extension and the axial direction of the impeller is between 70° and 30°; the circular splitter plate is axially fixed with an impeller drive shaft arranged upward, and the lower surface of the circular splitter plate is a smooth plane; The impeller fairing is arranged on the periphery of the impeller and is adapted to the rotation trajectory of the impeller. The upper part of the impeller fairing is provided with a first water inlet corresponding to the position of the V-shaped drainage part; in the length extension direction of the outer extension of the inclined plate, the impeller fairing is provided with an extended flow channel; below the circular splitter plate, the impeller fairing is provided with an annular air inlet chamber; the space between the upper end surface of the annular air inlet chamber and the circular splitter plate is called a bubble forming flow channel; the upper end surface of the annular air inlet chamber is provided with an annular air outlet window; an annular microporous air outlet plate is embedded in the annular air outlet window; a second water inlet is provided at the axial part of the annular air outlet window; the second water inlet is connected with a lower water inlet pipe; the water inlet pipe passes through the annular air inlet chamber and is sealed with the annular air inlet chamber; the lower part of the annular air inlet chamber is connected with an air inlet pipe; A driving motor is linked with the impeller driving shaft and is encapsulated in a watertight shell; the watertight shell is fixedly connected to the impeller fairing; outside the impeller driving shaft, water inlet windows are evenly opened on the side walls of the watertight shell.

2. A negative pressure suction type sewage treatment aeration and oxygen dissolving device according to claim 1, characterized in that: A one-way valve which is connected to the annular air inlet chamber is installed in the air inlet pipe.

3. A negative pressure suction type sewage treatment aeration and oxygen dissolving device according to claim 2, characterized in that: An air filter component is installed in the intake pipe upstream of the one-way valve.

4. A negative pressure suction type sewage treatment aeration and oxygen dissolving device according to claim 2, characterized in that: In the extended flow channel, convergent injection holes are evenly arranged in the circumferential direction; when the impeller pumps water, the water flow in the extended flow channel is sprayed out from the convergent injection holes.

5. A negative pressure suction type sewage treatment aeration and oxygen dissolving device according to claim 1, characterized in that: The annular microporous air outlet plate is evenly distributed with convex ribs in the diameter direction for increasing the surface area of ​​bubble release.

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